diff --git a/.github/actions/setup-gopherjs/action.yml b/.github/actions/setup-gopherjs/action.yml new file mode 100644 index 000000000..7bd1b7ab8 --- /dev/null +++ b/.github/actions/setup-gopherjs/action.yml @@ -0,0 +1,74 @@ +name: Setup GopherJS +description: Sets up Go, Node.js, and GopherJS + +inputs: + includeSyscall: + description: Indicates that the node-syscall package should be installed. + required: true + default: 'false' + + fixTemps: + description: Indicates that the Windows Temp variables should be fixed. + required: true + default: 'false' + +runs: + using: composite + steps: + - name: Fix Windows Temp Variables + if: inputs.fixTemps == 'true' + shell: pwsh + run: | + # see https://github.com/actions/runner-images/issues/712#issuecomment-613004302 + echo "TEMP=$env:USERPROFILE\AppData\Local\Temp" | Out-File -FilePath $env:GITHUB_ENV -Append -Encoding utf8 + echo "TMP=$env:USERPROFILE\AppData\Local\Temp" | Out-File -FilePath $env:GITHUB_ENV -Append -Encoding utf8 + echo "TMPDIR=$env:USERPROFILE\AppData\Local\Temp" | Out-File -FilePath $env:GITHUB_ENV -Append -Encoding utf8 + + - name: Setup Go + uses: actions/setup-go@v5 + with: + go-version: ${{ env.GO_VERSION }} + + - name: Setup Go Environment + working-directory: ${{ env.GOPHERJS_PATH }} + shell: bash + run: echo "GOROOT=$(go env GOROOT)" >> $GITHUB_ENV + + - name: Setup Node.js + uses: actions/setup-node@v4 + with: + node-version: ${{ env.NODE_VERSION }} + + - name: Install Node.js for non-Linux + if: inputs.includeSyscall != 'true' + working-directory: ${{ env.GOPHERJS_PATH }} + shell: bash + # Install required Node.js packages without optional (node-syscall). + run: npm install --omit=optional --no-package-lock + + - name: Install Node.js for Linux + if: inputs.includeSyscall == 'true' + working-directory: ${{ env.GOPHERJS_PATH }} + shell: bash + # Install required Node.js packages including optional (node-syscall). + run: | + npm install --include=optional --no-package-lock + + - name: Setup Node.js Environment + working-directory: ${{ env.GOPHERJS_PATH }} + shell: bash + # Make nodejs able to require installed modules from any working path. + run: echo "NODE_PATH=$(npm root)" >> $GITHUB_ENV + + - name: Install GopherJS + working-directory: ${{ env.GOPHERJS_PATH }} + shell: bash + run: go install -v + + - name: Setup information + shell: bash + run: | + echo ::notice::go version: $(go version) + echo ::notice::node version: $(node -v) + echo ::notice::npm version: $(npm -v) + echo ::notice::gopherjs version: $(gopherjs version) diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml new file mode 100644 index 000000000..07ff3844a --- /dev/null +++ b/.github/workflows/ci.yaml @@ -0,0 +1,223 @@ +name: CI + +on: + push: + branches: [ "*" ] + pull_request: + branches: [ "*" ] + +permissions: + contents: read + +concurrency: + group: ci-${{ github.ref }} + cancel-in-progress: true + +env: + GO_VERSION: 1.19.13 + NODE_VERSION: 18 + GOLANGCI_VERSION: v1.53.3 + GOPHERJS_EXPERIMENT: generics + SOURCE_MAP_SUPPORT: true + GOPATH: ${{ github.workspace }}/go + GOPHERJS_PATH: ${{ github.workspace }}/go/src/github.com/${{ github.repository }} + +jobs: + ubuntu_smoke: + name: Ubuntu Smoke + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + with: + path: ${{ env.GOPHERJS_PATH }} + - name: Copy Actions + run: cp -r ${{ env.GOPHERJS_PATH }}/.github . + - name: Setup GopherJS + uses: ./.github/actions/setup-gopherjs/ + with: + includeSyscall: 'true' + - name: Test GopherJS + working-directory: ${{ env.GOPHERJS_PATH }} + run: go test -v -short ./... + - name: Run Tests + working-directory: ${{ env.GOPHERJS_PATH }} + run: | + gopherjs build -v net/http + gopherjs test -v --short fmt log ./tests + + windows_smoke: + name: Window Smoke + runs-on: windows-latest + env: + # Windows does not support source maps. + SOURCE_MAP_SUPPORT: false + steps: + - uses: actions/checkout@v4 + with: + path: ${{ env.GOPHERJS_PATH }} + - name: Copy Actions + run: cp -r ${{ env.GOPHERJS_PATH }}/.github . + - name: Setup GopherJS + uses: ./.github/actions/setup-gopherjs/ + with: + fixTemps: 'true' + - name: Test GopherJS + working-directory: ${{ env.GOPHERJS_PATH }} + run: go test -v -short ./... + - name: Run Tests + working-directory: ${{ env.GOPHERJS_PATH }} + run: | + gopherjs build -v net/http + gopherjs test -v --short fmt sort ./tests + + darwin_smoke: + name: Darwin Smoke + runs-on: macos-latest + env: + # Node version '12' is not found for darwin. + NODE_VERSION: 20 + steps: + - uses: actions/checkout@v4 + with: + path: ${{ env.GOPHERJS_PATH }} + - name: Copy Actions + run: cp -r ${{ env.GOPHERJS_PATH }}/.github . + - name: Setup GopherJS + uses: ./.github/actions/setup-gopherjs/ + - name: Test GopherJS + working-directory: ${{ env.GOPHERJS_PATH }} + run: go test -v -short ./... + - name: Run Tests + working-directory: ${{ env.GOPHERJS_PATH }} + run: | + gopherjs build -v net/http + gopherjs test -v --short fmt log os ./tests + + lint: + name: Lint Checks + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + with: + path: ${{ env.GOPHERJS_PATH }} + - uses: actions/setup-go@v5 + with: + go-version: ${{ env.GO_VERSION }} + - name: Install golangci-lint + uses: golangci/golangci-lint-action@v3 + with: + working-directory: ${{ env.GOPHERJS_PATH }} + version: ${{ env.GOLANGCI_VERSION }} + only-new-issues: true + - name: Check go.mod + working-directory: ${{ env.GOPHERJS_PATH }} + run: go mod tidy && git diff --exit-code + - name: Check natives build tags + working-directory: ${{ env.GOPHERJS_PATH }} + # All those packages should have // +build js. + run: diff -u <(echo -n) <(go list ./compiler/natives/src/...) + + go_tests: + name: Go Tests + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + with: + path: ${{ env.GOPHERJS_PATH }} + - name: Copy Actions + run: cp -r ${{ env.GOPHERJS_PATH }}/.github . + - name: Setup GopherJS + uses: ./.github/actions/setup-gopherjs/ + with: + includeSyscall: 'true' + - name: Run Tests + working-directory: ${{ env.GOPHERJS_PATH }} + # Run all tests except gorepo tests. + run: go test -v -race $(go list ./... | grep -v github.com/gopherjs/gopherjs/tests/gorepo) + + todomvc_check: + name: TodoMVC GO111MODULE Check + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + with: + path: ${{ env.GOPHERJS_PATH }} + - name: Copy Actions + run: cp -r ${{ env.GOPHERJS_PATH }}/.github . + - name: Setup GopherJS + uses: ./.github/actions/setup-gopherjs/ + - name: TodoMVC in GOPATH mode + working-directory: ${{ env.GOPHERJS_PATH }} + env: + GO111MODULE: off + GOPATH: /tmp/gopath + run: | + mkdir -p $GOPATH/src/github.com/gopherjs/gopherjs + cp -r -p ${{ env.GOPHERJS_PATH }}/. $GOPATH/src/github.com/gopherjs/gopherjs/ + go get -v github.com/gopherjs/todomvc + gopherjs build -v -o /tmp/todomvc_gopath.js github.com/gopherjs/todomvc + gopherjs test -v github.com/gopherjs/todomvc/... + find $GOPATH + - name: TodoMVC in Go Modules mode + env: + GO111MODULE: on + GOPATH: /tmp/gmod + run: | + mkdir -p $GOPATH/src + cd /tmp + git clone --depth=1 https://github.com/gopherjs/todomvc.git + cd /tmp/todomvc + gopherjs build -v -o /tmp/todomvc_gomod.js github.com/gopherjs/todomvc + gopherjs test -v github.com/gopherjs/todomvc/... + find $GOPATH + - name: Compare GOPATH and Go Modules output + run: | + diff -u \ + <(sed 's/todomvc_gomod.js.map/todomvc_ignored.js.map/' /tmp/todomvc_gomod.js) \ + <(sed 's/todomvc_gopath.js.map/todomvc_ignored.js.map/' /tmp/todomvc_gopath.js) + + gopherjs_tests: + name: GopherJS Tests (${{ matrix.filter.name }}) + runs-on: ubuntu-latest + strategy: + fail-fast: false + matrix: + filter: + - name: non-crypto + pattern: '-Pve "^crypto"' + - name: cypto + pattern: '-Pe "^crypto"' + steps: + - uses: actions/checkout@v4 + with: + path: ${{ env.GOPHERJS_PATH }} + - name: Copy Actions + run: cp -r ${{ env.GOPHERJS_PATH }}/.github . + - name: Setup GopherJS + uses: ./.github/actions/setup-gopherjs/ + - name: Run GopherJS tests + working-directory: ${{ env.GOPHERJS_PATH }} + run: | + PACKAGE_NAMES=$( \ + GOOS=js GOARCH=wasm go list std github.com/gopherjs/gopherjs/js/... github.com/gopherjs/gopherjs/tests/... \ + | grep -v -x -f .std_test_pkg_exclusions \ + | grep ${{ matrix.filter.pattern }} \ + ) + echo "Running tests for packages:" + echo "$PACKAGE_NAMES" + gopherjs test -p 4 --minify -v --short $PACKAGE_NAMES + + gorepo_tests: + name: Gorepo Tests + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + with: + path: ${{ env.GOPHERJS_PATH }} + - name: Copy Actions + run: cp -r ${{ env.GOPHERJS_PATH }}/.github . + - name: Setup GopherJS + uses: ./.github/actions/setup-gopherjs/ + - name: Run GopherJS tests + working-directory: ${{ env.GOPHERJS_PATH }} + run: go test -v github.com/gopherjs/gopherjs/tests/gorepo diff --git a/.github/workflows/measure-size.yml b/.github/workflows/measure-size.yml new file mode 100644 index 000000000..1697b1127 --- /dev/null +++ b/.github/workflows/measure-size.yml @@ -0,0 +1,30 @@ +name: Measure canonical app size + +on: ['pull_request'] + +env: + GO_VERSION: '~1.19.13' + +jobs: + measure: + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + with: + fetch-depth: 0 + - uses: actions/setup-go@v5 + with: + go-version: ${{ env.GO_VERSION }} + - uses: gopherjs/output-size-action/measure@main + with: + name: jQuery TodoMVC + repo: https://github.com/gopherjs/todomvc + go-package: github.com/gopherjs/todomvc + report_json: /tmp/report.json + report_md: /tmp/report.md + - uses: actions/upload-artifact@v4 + with: + name: size_report + path: | + /tmp/report.json + /tmp/report.md diff --git a/.github/workflows/publish-size.yml b/.github/workflows/publish-size.yml new file mode 100644 index 000000000..ae0111471 --- /dev/null +++ b/.github/workflows/publish-size.yml @@ -0,0 +1,14 @@ +name: Publish canonical app size + +on: + workflow_run: + workflows: ["Measure canonical app size"] + types: ["completed"] + +jobs: + publish: + runs-on: ubuntu-latest + steps: + - uses: gopherjs/output-size-action/publish@main + with: + report_artifact: size_report diff --git a/.golangci.toml b/.golangci.toml new file mode 100644 index 000000000..535ea6b50 --- /dev/null +++ b/.golangci.toml @@ -0,0 +1,15 @@ +[run] +timeout = "1m" + +[output] +format = "colored-line-number" + +[linters] +disable-all = true +enable = [ + "gofumpt", + "govet", +] + +[issues] +exclude-use-default = false diff --git a/.std_test_pkg_exclusions b/.std_test_pkg_exclusions index 38ac7786d..ae9691df7 100644 --- a/.std_test_pkg_exclusions +++ b/.std_test_pkg_exclusions @@ -1,65 +1,22 @@ -context -crypto -crypto/internal/cipherhw -crypto/tls -crypto/x509/pkix -debug/gosym -debug/plan9obj -encoding +encoding/xml go/build -go/importer -go/internal/gccgoimporter -go/internal/gcimporter go/internal/srcimporter go/types -hash -image/color/palette -image/internal/imageutil -internal/cpu -internal/goroot -internal/nettrace -internal/poll -internal/race -internal/singleflight -internal/syscall/unix +internal/abi +internal/intern internal/syscall/windows internal/syscall/windows/registry internal/syscall/windows/sysdll -internal/testenv -internal/testlog -internal/trace internal/x/net/nettest -log -log/syslog -net -net/http -net/http/cgi net/http/httptest -net/http/httptrace net/http/httputil -net/http/internal net/http/pprof -net/internal/socktest net/rpc -net/smtp -os -os/exec -os/signal os/signal/internal/pty -os/user -plugin runtime runtime/cgo runtime/debug runtime/internal/atomic -runtime/internal/math -runtime/internal/sys runtime/pprof runtime/pprof/internal/profile -runtime/race runtime/trace -syscall -testing -testing/internal/testdeps -testing/iotest -unsafe diff --git a/README.md b/README.md index ed923cffe..016d41bf3 100644 --- a/README.md +++ b/README.md @@ -1,48 +1,63 @@ -GopherJS - A compiler from Go to JavaScript -------------------------------------------- +## GopherJS - A compiler from Go to JavaScript [![GoDoc](https://godoc.org/github.com/gopherjs/gopherjs/js?status.svg)](https://godoc.org/github.com/gopherjs/gopherjs/js) [![Sourcegraph](https://sourcegraph.com/github.com/gopherjs/gopherjs/-/badge.svg)](https://sourcegraph.com/github.com/gopherjs/gopherjs?badge) -[![Circle CI](https://circleci.com/gh/gopherjs/gopherjs.svg?style=svg)](https://circleci.com/gh/gopherjs/gopherjs) +[![Github Actions CI](https://github.com/gopherjs/gopherjs/actions/workflows/ci.yaml/badge.svg)](https://github.com/gopherjs/gopherjs/actions/workflows/ci.yaml) -GopherJS compiles Go code ([golang.org](https://golang.org/)) to pure JavaScript code. Its main purpose is to give you the opportunity to write front-end code in Go which will still run in all browsers. +GopherJS compiles Go code ([go.dev](https://go.dev/)) to pure JavaScript code. Its main purpose is to give you the opportunity to write front-end code in Go which will still run in all browsers. + +### Help us make GopherJS better! + +- ⤴️ **Help us make better decisions by filling a quick 15-question [GopherJS user survey](https://forms.gle/WEjZqZaPxTxjD9YP8)**. +- 📢 Report and discuss [issues](https://github.com/gopherjs/gopherjs/issues). +- 🎓 Share your knowledge and experience through [articles](https://github.com/gopherjs/gopherjs/wiki/Community-Tutorials-and-Blogs) and [documentation](https://github.com/gopherjs/gopherjs/tree/master/doc). +- 🛠️ Write GopherJS [bindings](https://github.com/gopherjs/gopherjs/wiki/Bindings) for other libraries or [contribute](https://github.com/gopherjs/gopherjs/wiki/Developer-Guidelines) to GopherJS itself. + +### What's new? + +- 2024-02-24: Go 1.19 support is [available](https://github.com/gopherjs/gopherjs/releases/tag/v1.19.0-beta1)! +- 2022-08-18: Go 1.18 support is [available](https://github.com/gopherjs/gopherjs/releases/tag/v1.18.0-beta2%2Bgo1.18.5)! +- 2021-09-19: Go 1.17 support is available! +- 2021-08-23: Go Modules are now fully supported. +- 2021-06-19: Complete `syscall/js` package implementation compatible with the upstream Go 1.16. +- 2021-04-04: **Go 1.16 is now officially supported!** 🎉 🎉 🎉 ### Playground + Give GopherJS a try on the [GopherJS Playground](http://gopherjs.github.io/playground/). ### What is supported? -Nearly everything, including Goroutines ([compatibility table](https://github.com/gopherjs/gopherjs/blob/master/doc/packages.md)). Performance is quite good in most cases, see [HTML5 game engine benchmark](https://ajhager.github.io/engi/demos/botmark.html). Cgo is not supported. + +Nearly everything, including Goroutines ([compatibility documentation](https://github.com/gopherjs/gopherjs/blob/master/doc/compatibility.md)). Performance is quite good in most cases, see [HTML5 game engine benchmark](https://ajhager.github.io/engi/demos/botmark.html). Cgo is not supported. ### Installation and Usage -GopherJS requires Go 1.12 or newer. -Get or update GopherJS and dependencies with: +GopherJS [requires Go 1.19 or newer](https://github.com/gopherjs/gopherjs/blob/master/doc/compatibility.md#go-version-compatibility). If you need an older Go +version, you can use an [older GopherJS release](https://github.com/gopherjs/gopherjs/releases). + +Install GopherJS with `go install`: ``` -go get -u github.com/gopherjs/gopherjs +go install github.com/gopherjs/gopherjs@v1.19.0-beta1 # Or replace 'v1.19.0-beta1' with another version. ``` -If your local Go distribution as reported by `go version` is newer than Go 1.12, then you need to set the `GOPHERJS_GOROOT` environment variable to a directory that contains a Go 1.12 distribution. For example: +If your local Go distribution as reported by `go version` is newer than Go 1.19, then you need to set the `GOPHERJS_GOROOT` environment variable to a directory that contains a Go 1.19 distribution. For example: ``` -go get golang.org/dl/go1.12.16 -go1.12.16 download -export GOPHERJS_GOROOT="$(go1.12.16 env GOROOT)" # Also add this line to your .profile or equivalent. +go install golang.org/dl/go1.19.13@latest +go1.19.13 download +export GOPHERJS_GOROOT="$(go1.19.13 env GOROOT)" # Also add this line to your .profile or equivalent. ``` Now you can use `gopherjs build [package]`, `gopherjs build [files]` or `gopherjs install [package]` which behave similar to the `go` tool. For `main` packages, these commands create a `.js` file and `.js.map` source map in the current directory or in `$GOPATH/bin`. The generated JavaScript file can be used as usual in a website. Use `gopherjs help [command]` to get a list of possible command line flags, e.g. for minification and automatically watching for changes. `gopherjs` uses your platform's default `GOOS` value when generating code. Supported `GOOS` values are: `linux`, `darwin`. If you're on a different platform (e.g., Windows or FreeBSD), you'll need to set the `GOOS` environment variable to a supported value. For example, `GOOS=linux gopherjs build [package]`. -*Note: GopherJS will try to write compiled object files of the core packages to your $GOROOT/pkg directory. If that fails, it will fall back to $GOPATH/pkg.* +_Note: GopherJS will try to write compiled object files of the core packages to your $GOROOT/pkg directory. If that fails, it will fall back to $GOPATH/pkg._ #### gopherjs run, gopherjs test -If you want to use `gopherjs run` or `gopherjs test` to run the generated code locally, install Node.js 10.0.0 (or newer), and the `source-map-support` module: - -``` -npm install --global source-map-support -``` +If you want to use `gopherjs run` or `gopherjs test` to run the generated code locally, install Node.js 18 (or newer). On supported `GOOS` platforms, it's possible to make system calls (file system access, etc.) available. See [doc/syscalls.md](https://github.com/gopherjs/gopherjs/blob/master/doc/syscalls.md) for instructions on how to do so. @@ -58,12 +73,13 @@ If you include an argument, it will be the root from which everything is served. #### Environment Variables -There is one GopherJS-specific environment variable: +There are some GopherJS-specific environment variables: -``` -GOPHERJS_GOROOT - if set, GopherJS uses this value as the default GOROOT value, - instead of using the system GOROOT as the default GOROOT value -``` +- `GOPHERJS_GOROOT` - if set, GopherJS uses this value as the default GOROOT + value, instead of using the system GOROOT as the default GOROOT value +- `GOPHERJS_SKIP_VERSION_CHECK` - if set to true, GopherJS will not check + Go version in the GOROOT for compatibility with the GopherJS release. This + is primarily useful for testing GopherJS against unreleased versions of Go. ### Performance Tips @@ -73,14 +89,17 @@ GOPHERJS_GOROOT - if set, GopherJS uses this value as the default GOROOT value, - Use `float64` instead of `float32`. ### Community + - [#gopherjs Channel on Gophers Slack](https://gophers.slack.com/messages/gopherjs/) (invites to Gophers Slack are available [here](http://blog.gopheracademy.com/gophers-slack-community/#how-can-i-be-invited-to-join:2facdc921b2310f18cb851c36fa92369)) - [Bindings to JavaScript APIs and libraries](https://github.com/gopherjs/gopherjs/wiki/bindings) - [GopherJS Blog](https://medium.com/gopherjs) - [GopherJS on Twitter](https://twitter.com/GopherJS) +- [Examples, tutorials and blogs](https://github.com/gopherjs/gopherjs/wiki/Community-Tutorials-and-Blogs) ### Getting started #### Interacting with the DOM + The package `github.com/gopherjs/gopherjs/js` (see [documentation](https://godoc.org/github.com/gopherjs/gopherjs/js)) provides functions for interacting with native JavaScript APIs. For example the line ```js @@ -96,6 +115,7 @@ js.Global.Get("document").Call("write", "Hello world!") You may also want use the [DOM bindings](http://dominik.honnef.co/go/js/dom), the [jQuery bindings](https://github.com/gopherjs/jquery) (see [TodoMVC Example](https://github.com/gopherjs/todomvc)) or the [AngularJS bindings](https://github.com/wvell/go-angularjs). Those are some of the [bindings to JavaScript APIs and libraries](https://github.com/gopherjs/gopherjs/wiki/bindings) by community members. #### Providing library functions for use in other JavaScript code + Set a global variable to a map that contains the functions: ```go @@ -131,7 +151,10 @@ For more details see [Jason Stone's blog post](http://legacytotheedge.blogspot.d ### Architecture #### General -GopherJS emulates a 32-bit environment. This means that `int`, `uint` and `uintptr` have a precision of 32 bits. However, the explicit 64-bit integer types `int64` and `uint64` are supported. The `GOARCH` value of GopherJS is "js". You may use it as a build constraint: `// +build js`. + +GopherJS emulates a 32-bit environment. This means that `int`, `uint` and `uintptr` have a precision of 32 bits. However, the explicit 64-bit integer types `int64` and `uint64` are supported. + +The `GOOS` value of this environment is `js`, and the `GOARCH` value is `ecmascript`. You may use these values in build constraints when [writing platform-specific code](doc/compatibility.md#how-to-write-portable-code). (GopherJS 1.17 and older used `js` as the `GOARCH` value.) #### Application Lifecycle @@ -140,6 +163,7 @@ The `main` function is executed as usual after all `init` functions have run. Ja In the browser, calling `os.Exit` (e.g. indirectly by `log.Fatal`) also does not terminate the execution of the program. For convenience, it calls `runtime.Goexit` to immediately terminate the calling goroutine. #### Goroutines + Goroutines are fully supported by GopherJS. The only restriction is that you need to start a new goroutine if you want to use blocking code called from external JavaScript: ```go @@ -159,4 +183,5 @@ JavaScript has no concept of concurrency (except web workers, but those are too GopherJS does some heavy lifting to work around this restriction: Whenever an instruction is blocking (e.g. communicating with a channel that isn't ready), the whole stack will unwind (= all functions return) and the goroutine will be put to sleep. Then another goroutine which is ready to resume gets picked and its stack with all local variables will be restored. ### GopherJS Development + If you're looking to make changes to the GopherJS compiler, see [Developer Guidelines](https://github.com/gopherjs/gopherjs/wiki/Developer-Guidelines) for additional developer information. diff --git a/build/build.go b/build/build.go index 6761d7d4e..46786a30b 100644 --- a/build/build.go +++ b/build/build.go @@ -1,3 +1,8 @@ +// Package build implements GopherJS build system. +// +// WARNING: This package's API is treated as internal and currently doesn't +// provide any API stability guarantee, use it at your own risk. If you need a +// stable interface, prefer invoking the gopherjs CLI tool as a subprocess. package build import ( @@ -8,30 +13,34 @@ import ( "go/scanner" "go/token" "go/types" - "io" - "io/ioutil" + "io/fs" "os" "os/exec" "path" "path/filepath" - "runtime" + "sort" "strconv" "strings" + "sync" "time" "github.com/fsnotify/fsnotify" "github.com/gopherjs/gopherjs/compiler" - "github.com/gopherjs/gopherjs/compiler/gopherjspkg" - "github.com/gopherjs/gopherjs/compiler/natives" + "github.com/gopherjs/gopherjs/compiler/astutil" + "github.com/gopherjs/gopherjs/compiler/jsFile" + "github.com/gopherjs/gopherjs/compiler/sources" + "github.com/gopherjs/gopherjs/internal/errorList" + "github.com/gopherjs/gopherjs/internal/testmain" + log "github.com/sirupsen/logrus" + "github.com/neelance/sourcemap" - "github.com/shurcooL/httpfs/vfsutil" "golang.org/x/tools/go/buildutil" ) // DefaultGOROOT is the default GOROOT value for builds. // // It uses the GOPHERJS_GOROOT environment variable if it is set, -// or else the default GOROOT value of the system Go distrubtion. +// or else the default GOROOT value of the system Go distribution. var DefaultGOROOT = func() string { if goroot, ok := os.LookupEnv("GOPHERJS_GOROOT"); ok { // GopherJS-specific GOROOT value takes precedence. @@ -41,78 +50,21 @@ var DefaultGOROOT = func() string { return build.Default.GOROOT }() -type ImportCError struct { - pkgPath string -} - -func (e *ImportCError) Error() string { - return e.pkgPath + `: importing "C" is not supported by GopherJS` -} - // NewBuildContext creates a build context for building Go packages // with GopherJS compiler. // // Core GopherJS packages (i.e., "github.com/gopherjs/gopherjs/js", "github.com/gopherjs/gopherjs/nosync") -// are loaded from gopherjspkg.FS virtual filesystem rather than GOPATH. -func NewBuildContext(installSuffix string, buildTags []string) *build.Context { - gopherjsRoot := filepath.Join(DefaultGOROOT, "src", "github.com", "gopherjs", "gopherjs") - return &build.Context{ - GOROOT: DefaultGOROOT, - GOPATH: build.Default.GOPATH, - GOOS: build.Default.GOOS, - GOARCH: "js", - InstallSuffix: installSuffix, - Compiler: "gc", - BuildTags: append(buildTags, - "netgo", // See https://godoc.org/net#hdr-Name_Resolution. - "purego", // See https://golang.org/issues/23172. - ), - ReleaseTags: build.Default.ReleaseTags[:compiler.GoVersion], - CgoEnabled: true, // detect `import "C"` to throw proper error - - IsDir: func(path string) bool { - if strings.HasPrefix(path, gopherjsRoot+string(filepath.Separator)) { - path = filepath.ToSlash(path[len(gopherjsRoot):]) - if fi, err := vfsutil.Stat(gopherjspkg.FS, path); err == nil { - return fi.IsDir() - } - } - fi, err := os.Stat(path) - return err == nil && fi.IsDir() - }, - ReadDir: func(path string) ([]os.FileInfo, error) { - if strings.HasPrefix(path, gopherjsRoot+string(filepath.Separator)) { - path = filepath.ToSlash(path[len(gopherjsRoot):]) - if fis, err := vfsutil.ReadDir(gopherjspkg.FS, path); err == nil { - return fis, nil - } - } - return ioutil.ReadDir(path) - }, - OpenFile: func(path string) (io.ReadCloser, error) { - if strings.HasPrefix(path, gopherjsRoot+string(filepath.Separator)) { - path = filepath.ToSlash(path[len(gopherjsRoot):]) - if f, err := gopherjspkg.FS.Open(path); err == nil { - return f, nil - } - } - return os.Open(path) - }, - } -} - -// statFile returns an os.FileInfo describing the named file. -// For files in "$GOROOT/src/github.com/gopherjs/gopherjs" directory, -// gopherjspkg.FS is consulted first. -func statFile(path string) (os.FileInfo, error) { - gopherjsRoot := filepath.Join(DefaultGOROOT, "src", "github.com", "gopherjs", "gopherjs") - if strings.HasPrefix(path, gopherjsRoot+string(filepath.Separator)) { - path = filepath.ToSlash(path[len(gopherjsRoot):]) - if fi, err := vfsutil.Stat(gopherjspkg.FS, path); err == nil { - return fi, nil - } +// are loaded from gopherjspkg.FS virtual filesystem if not present in GOPATH or +// go.mod. +func NewBuildContext(installSuffix string, buildTags []string) XContext { + e := DefaultEnv() + e.InstallSuffix = installSuffix + e.BuildTags = buildTags + realGOROOT := goCtx(e) + return &chainedCtx{ + primary: realGOROOT, + secondary: gopherjsCtx(e), } - return os.Stat(path) } // Import returns details about the Go package named by the import path. If the @@ -123,107 +75,22 @@ func statFile(path string) (os.FileInfo, error) { // In the directory containing the package, .go and .inc.js files are // considered part of the package except for: // -// - .go files in package documentation -// - files starting with _ or . (likely editor temporary files) -// - files with build constraints not satisfied by the context +// - .go files in package documentation +// - files starting with _ or . (likely editor temporary files) +// - files with build constraints not satisfied by the context // // If an error occurs, Import returns a non-nil error and a nil // *PackageData. func Import(path string, mode build.ImportMode, installSuffix string, buildTags []string) (*PackageData, error) { wd, err := os.Getwd() if err != nil { - // Getwd may fail if we're in GOARCH=js mode. That's okay, handle + // Getwd may fail if we're in GOOS=js mode. That's okay, handle // it by falling back to empty working directory. It just means // Import will not be able to resolve relative import paths. wd = "" } - bctx := NewBuildContext(installSuffix, buildTags) - return importWithSrcDir(*bctx, path, wd, mode, installSuffix) -} - -func importWithSrcDir(bctx build.Context, path string, srcDir string, mode build.ImportMode, installSuffix string) (*PackageData, error) { - // bctx is passed by value, so it can be modified here. - var isVirtual bool - switch path { - case "syscall": - // syscall needs to use a typical GOARCH like amd64 to pick up definitions for _Socklen, BpfInsn, IFNAMSIZ, Timeval, BpfStat, SYS_FCNTL, Flock_t, etc. - bctx.GOARCH = runtime.GOARCH - bctx.InstallSuffix = "js" - if installSuffix != "" { - bctx.InstallSuffix += "_" + installSuffix - } - case "syscall/js": - // There are no buildable files in this package, but we need to use files in the virtual directory. - mode |= build.FindOnly - case "math/big": - // Use pure Go version of math/big; we don't want non-Go assembly versions. - bctx.BuildTags = append(bctx.BuildTags, "math_big_pure_go") - case "crypto/x509", "os/user": - // These stdlib packages have cgo and non-cgo versions (via build tags); we want the latter. - bctx.CgoEnabled = false - case "github.com/gopherjs/gopherjs/js", "github.com/gopherjs/gopherjs/nosync": - // These packages are already embedded via gopherjspkg.FS virtual filesystem (which can be - // safely vendored). Don't try to use vendor directory to resolve them. - mode |= build.IgnoreVendor - isVirtual = true - } - pkg, err := bctx.Import(path, srcDir, mode) - if err != nil { - return nil, err - } - - switch path { - case "os": - pkg.GoFiles = excludeExecutable(pkg.GoFiles) // Need to exclude executable implementation files, because some of them contain package scope variables that perform (indirectly) syscalls on init. - case "runtime": - pkg.GoFiles = []string{"error.go"} - case "runtime/internal/sys": - pkg.GoFiles = []string{fmt.Sprintf("zgoos_%s.go", bctx.GOOS), "zversion.go"} - case "runtime/pprof": - pkg.GoFiles = nil - case "internal/poll": - pkg.GoFiles = exclude(pkg.GoFiles, "fd_poll_runtime.go") - case "crypto/rand": - pkg.GoFiles = []string{"rand.go", "util.go"} - pkg.TestGoFiles = exclude(pkg.TestGoFiles, "rand_linux_test.go") // Don't want linux-specific tests (since linux-specific package files are excluded too). - } - - if len(pkg.CgoFiles) > 0 { - return nil, &ImportCError{path} - } - - if pkg.IsCommand() { - pkg.PkgObj = filepath.Join(pkg.BinDir, filepath.Base(pkg.ImportPath)+".js") - } - - if _, err := os.Stat(pkg.PkgObj); os.IsNotExist(err) && strings.HasPrefix(pkg.PkgObj, DefaultGOROOT) { - // fall back to GOPATH - firstGopathWorkspace := filepath.SplitList(build.Default.GOPATH)[0] // TODO: Need to check inside all GOPATH workspaces. - gopathPkgObj := filepath.Join(firstGopathWorkspace, pkg.PkgObj[len(DefaultGOROOT):]) - if _, err := os.Stat(gopathPkgObj); err == nil { - pkg.PkgObj = gopathPkgObj - } - } - - jsFiles, err := jsFilesFromDir(&bctx, pkg.Dir) - if err != nil { - return nil, err - } - - return &PackageData{Package: pkg, JSFiles: jsFiles, IsVirtual: isVirtual}, nil -} - -// excludeExecutable excludes all executable implementation .go files. -// They have "executable_" prefix. -func excludeExecutable(goFiles []string) []string { - var s []string - for _, f := range goFiles { - if strings.HasPrefix(f, "executable_") { - continue - } - s = append(s, f) - } - return s + xctx := NewBuildContext(installSuffix, buildTags) + return xctx.Import(path, wd, mode) } // exclude returns files, excluding specified files. @@ -244,18 +111,33 @@ Outer: // ImportDir is like Import but processes the Go package found in the named // directory. func ImportDir(dir string, mode build.ImportMode, installSuffix string, buildTags []string) (*PackageData, error) { - bctx := NewBuildContext(installSuffix, buildTags) - pkg, err := bctx.ImportDir(dir, mode) + xctx := NewBuildContext(installSuffix, buildTags) + pkg, err := xctx.Import(".", dir, mode) if err != nil { return nil, err } - jsFiles, err := jsFilesFromDir(bctx, pkg.Dir) - if err != nil { - return nil, err - } + return pkg, nil +} - return &PackageData{Package: pkg, JSFiles: jsFiles}, nil +// overrideInfo is used by parseAndAugment methods to manage +// directives and how the overlay and original are merged. +type overrideInfo struct { + // KeepOriginal indicates that the original code should be kept + // but the identifier will be prefixed by `_gopherjs_original_foo`. + // If false the original code is removed. + keepOriginal bool + + // purgeMethods indicates that this info is for a type and + // if a method has this type as a receiver should also be removed. + // If the method is defined in the overlays and therefore has its + // own overrides, this will be ignored. + purgeMethods bool + + // overrideSignature is the function definition given in the overlays + // that should be used to replace the signature in the originals. + // Only receivers, type parameters, parameters, and results will be used. + overrideSignature *ast.FuncDecl } // parseAndAugment parses and returns all .go files of given pkg. @@ -266,121 +148,110 @@ func ImportDir(dir string, mode build.ImportMode, installSuffix string, buildTag // The native packages are augmented by the contents of natives.FS in the following way. // The file names do not matter except the usual `_test` suffix. The files for // native overrides get added to the package (even if they have the same name -// as an existing file from the standard library). For all identifiers that exist -// in the original AND the overrides, the original identifier in the AST gets -// replaced by `_`. New identifiers that don't exist in original package get added. -func parseAndAugment(bctx *build.Context, pkg *build.Package, isTest bool, fileSet *token.FileSet) ([]*ast.File, error) { - var files []*ast.File - replacedDeclNames := make(map[string]bool) - funcName := func(d *ast.FuncDecl) string { - if d.Recv == nil || len(d.Recv.List) == 0 { - return d.Name.Name - } - recv := d.Recv.List[0].Type - if star, ok := recv.(*ast.StarExpr); ok { - recv = star.X +// as an existing file from the standard library). +// +// - For function identifiers that exist in the original and the overrides +// and have the directive `gopherjs:keep-original`, the original identifier +// in the AST gets prefixed by `_gopherjs_original_`. +// - For identifiers that exist in the original and the overrides, and have +// the directive `gopherjs:purge`, both the original and override are +// removed. This is for completely removing something which is currently +// invalid for GopherJS. For any purged types any methods with that type as +// the receiver are also removed. +// - For function identifiers that exist in the original and the overrides, +// and have the directive `gopherjs:override-signature`, the overridden +// function is removed and the original function's signature is changed +// to match the overridden function signature. This allows the receiver, +// type parameters, parameter, and return values to be modified as needed. +// - Otherwise for identifiers that exist in the original and the overrides, +// the original is removed. +// - New identifiers that don't exist in original package get added. +func parseAndAugment(xctx XContext, pkg *PackageData, isTest bool, fileSet *token.FileSet) ([]*ast.File, []jsFile.JSFile, error) { + jsFiles, overlayFiles := parseOverlayFiles(xctx, pkg, isTest, fileSet) + + originalFiles, err := parserOriginalFiles(pkg, fileSet) + if err != nil { + return nil, nil, err + } + + overrides := make(map[string]overrideInfo) + for _, file := range overlayFiles { + augmentOverlayFile(file, overrides) + } + delete(overrides, "init") + + for _, file := range originalFiles { + augmentOriginalImports(pkg.ImportPath, file) + } + + if len(overrides) > 0 { + for _, file := range originalFiles { + augmentOriginalFile(file, overrides) } - return recv.(*ast.Ident).Name + "." + d.Name.Name } + + return append(overlayFiles, originalFiles...), jsFiles, nil +} + +// parseOverlayFiles loads and parses overlay files +// to augment the original files with. +func parseOverlayFiles(xctx XContext, pkg *PackageData, isTest bool, fileSet *token.FileSet) ([]jsFile.JSFile, []*ast.File) { isXTest := strings.HasSuffix(pkg.ImportPath, "_test") importPath := pkg.ImportPath if isXTest { importPath = importPath[:len(importPath)-5] } - nativesContext := &build.Context{ - GOROOT: "/", - GOOS: build.Default.GOOS, - GOARCH: "js", - Compiler: "gc", - JoinPath: path.Join, - SplitPathList: func(list string) []string { - if list == "" { - return nil - } - return strings.Split(list, "/") - }, - IsAbsPath: path.IsAbs, - IsDir: func(name string) bool { - dir, err := natives.FS.Open(name) - if err != nil { - return false - } - defer dir.Close() - info, err := dir.Stat() - if err != nil { - return false - } - return info.IsDir() - }, - HasSubdir: func(root, name string) (rel string, ok bool) { - panic("not implemented") - }, - ReadDir: func(name string) (fi []os.FileInfo, err error) { - dir, err := natives.FS.Open(name) - if err != nil { - return nil, err - } - defer dir.Close() - return dir.Readdir(0) - }, - OpenFile: func(name string) (r io.ReadCloser, err error) { - return natives.FS.Open(name) - }, + nativesContext := overlayCtx(xctx.Env()) + nativesPkg, err := nativesContext.Import(importPath, "", 0) + if err != nil { + return nil, nil } - if nativesPkg, err := nativesContext.Import(importPath, "", 0); err == nil { - names := nativesPkg.GoFiles - if isTest { - names = append(names, nativesPkg.TestGoFiles...) - } - if isXTest { - names = nativesPkg.XTestGoFiles + jsFiles := nativesPkg.JSFiles + var files []*ast.File + names := nativesPkg.GoFiles + if isTest { + names = append(names, nativesPkg.TestGoFiles...) + } + if isXTest { + names = nativesPkg.XTestGoFiles + } + + for _, name := range names { + fullPath := path.Join(nativesPkg.Dir, name) + r, err := nativesContext.bctx.OpenFile(fullPath) + if err != nil { + panic(err) } - for _, name := range names { - fullPath := path.Join(nativesPkg.Dir, name) - r, err := nativesContext.OpenFile(fullPath) - if err != nil { - panic(err) - } - file, err := parser.ParseFile(fileSet, fullPath, r, parser.ParseComments) - if err != nil { - panic(err) - } - r.Close() - for _, decl := range file.Decls { - switch d := decl.(type) { - case *ast.FuncDecl: - replacedDeclNames[funcName(d)] = true - case *ast.GenDecl: - switch d.Tok { - case token.TYPE: - for _, spec := range d.Specs { - replacedDeclNames[spec.(*ast.TypeSpec).Name.Name] = true - } - case token.VAR, token.CONST: - for _, spec := range d.Specs { - for _, name := range spec.(*ast.ValueSpec).Names { - replacedDeclNames[name.Name] = true - } - } - } - } - } - files = append(files, file) + // Files should be uniquely named and in the original package directory in order to be + // ordered correctly + newPath := path.Join(pkg.Dir, "gopherjs__"+name) + file, err := parser.ParseFile(fileSet, newPath, r, parser.ParseComments) + if err != nil { + panic(err) } + r.Close() + + files = append(files, file) } - delete(replacedDeclNames, "init") + return jsFiles, files +} - var errList compiler.ErrorList +// parserOriginalFiles loads and parses the original files to augment. +func parserOriginalFiles(pkg *PackageData, fileSet *token.FileSet) ([]*ast.File, error) { + var files []*ast.File + var errList errorList.ErrorList for _, name := range pkg.GoFiles { if !filepath.IsAbs(name) { // name might be absolute if specified directly. E.g., `gopherjs build /abs/file.go`. name = filepath.Join(pkg.Dir, name) } - r, err := buildutil.OpenFile(bctx, name) + + r, err := buildutil.OpenFile(pkg.bctx, name) if err != nil { return nil, err } + file, err := parser.ParseFile(fileSet, name, r, parser.ParseComments) r.Close() if err != nil { @@ -397,57 +268,335 @@ func parseAndAugment(bctx *build.Context, pkg *build.Package, isTest bool, fileS continue } - switch pkg.ImportPath { - case "crypto/rand", "encoding/gob", "encoding/json", "expvar", "go/token", "log", "math/big", "math/rand", "regexp", "testing", "time": - for _, spec := range file.Imports { - path, _ := strconv.Unquote(spec.Path.Value) - if path == "sync" { - if spec.Name == nil { - spec.Name = ast.NewIdent("sync") + files = append(files, file) + } + + if errList != nil { + return nil, errList + } + return files, nil +} + +// augmentOverlayFile is the part of parseAndAugment that processes +// an overlay file AST to collect information such as compiler directives +// and perform any initial augmentation needed to the overlay. +func augmentOverlayFile(file *ast.File, overrides map[string]overrideInfo) { + anyChange := false + for i, decl := range file.Decls { + purgeDecl := astutil.Purge(decl) + switch d := decl.(type) { + case *ast.FuncDecl: + k := astutil.FuncKey(d) + oi := overrideInfo{ + keepOriginal: astutil.KeepOriginal(d), + } + if astutil.OverrideSignature(d) { + oi.overrideSignature = d + purgeDecl = true + } + overrides[k] = oi + case *ast.GenDecl: + for j, spec := range d.Specs { + purgeSpec := purgeDecl || astutil.Purge(spec) + switch s := spec.(type) { + case *ast.TypeSpec: + overrides[s.Name.Name] = overrideInfo{ + purgeMethods: purgeSpec, + } + case *ast.ValueSpec: + for _, name := range s.Names { + overrides[name.Name] = overrideInfo{} } - spec.Path.Value = `"github.com/gopherjs/gopherjs/nosync"` + } + if purgeSpec { + anyChange = true + d.Specs[j] = nil } } } + if purgeDecl { + anyChange = true + file.Decls[i] = nil + } + } + if anyChange { + finalizeRemovals(file) + pruneImports(file) + } +} - for _, decl := range file.Decls { - switch d := decl.(type) { - case *ast.FuncDecl: - if replacedDeclNames[funcName(d)] { - d.Name = ast.NewIdent("_") +// augmentOriginalImports is the part of parseAndAugment that processes +// an original file AST to modify the imports for that file. +func augmentOriginalImports(importPath string, file *ast.File) { + switch importPath { + case "crypto/rand", "encoding/gob", "encoding/json", "expvar", "go/token", "log", "math/big", "math/rand", "regexp", "time": + for _, spec := range file.Imports { + path, _ := strconv.Unquote(spec.Path.Value) + if path == "sync" { + if spec.Name == nil { + spec.Name = ast.NewIdent("sync") } - case *ast.GenDecl: - switch d.Tok { - case token.TYPE: - for _, spec := range d.Specs { - s := spec.(*ast.TypeSpec) - if replacedDeclNames[s.Name.Name] { - s.Name = ast.NewIdent("_") - } + spec.Path.Value = `"github.com/gopherjs/gopherjs/nosync"` + } + } + } +} + +// augmentOriginalFile is the part of parseAndAugment that processes an +// original file AST to augment the source code using the overrides from +// the overlay files. +func augmentOriginalFile(file *ast.File, overrides map[string]overrideInfo) { + anyChange := false + for i, decl := range file.Decls { + switch d := decl.(type) { + case *ast.FuncDecl: + if info, ok := overrides[astutil.FuncKey(d)]; ok { + anyChange = true + removeFunc := true + if info.keepOriginal { + // Allow overridden function calls + // The standard library implementation of foo() becomes _gopherjs_original_foo() + d.Name.Name = "_gopherjs_original_" + d.Name.Name + removeFunc = false + } + if overSig := info.overrideSignature; overSig != nil { + d.Recv = overSig.Recv + d.Type.TypeParams = overSig.Type.TypeParams + d.Type.Params = overSig.Type.Params + d.Type.Results = overSig.Type.Results + removeFunc = false + } + if removeFunc { + file.Decls[i] = nil + } + } else if recvKey := astutil.FuncReceiverKey(d); len(recvKey) > 0 { + // check if the receiver has been purged, if so, remove the method too. + if info, ok := overrides[recvKey]; ok && info.purgeMethods { + anyChange = true + file.Decls[i] = nil + } + } + case *ast.GenDecl: + for j, spec := range d.Specs { + switch s := spec.(type) { + case *ast.TypeSpec: + if _, ok := overrides[s.Name.Name]; ok { + anyChange = true + d.Specs[j] = nil } - case token.VAR, token.CONST: - for _, spec := range d.Specs { - s := spec.(*ast.ValueSpec) - for i, name := range s.Names { - if replacedDeclNames[name.Name] { - s.Names[i] = ast.NewIdent("_") + case *ast.ValueSpec: + if len(s.Names) == len(s.Values) { + // multi-value context + // e.g. var a, b = 2, foo[int]() + // A removal will also remove the value which may be from a + // function call. This allows us to remove unwanted statements. + // However, if that call has a side effect which still needs + // to be run, add the call into the overlay. + for k, name := range s.Names { + if _, ok := overrides[name.Name]; ok { + anyChange = true + s.Names[k] = nil + s.Values[k] = nil + } + } + } else { + // single-value context + // e.g. var a, b = foo[int]() + // If a removal from the overlays makes all returned values unused, + // then remove the function call as well. This allows us to stop + // unwanted calls if needed. If that call has a side effect which + // still needs to be run, add the call into the overlay. + nameRemoved := false + for _, name := range s.Names { + if _, ok := overrides[name.Name]; ok { + nameRemoved = true + name.Name = `_` + } + } + if nameRemoved { + removeSpec := true + for _, name := range s.Names { + if name.Name != `_` { + removeSpec = false + break + } + } + if removeSpec { + anyChange = true + d.Specs[j] = nil } } } } } } - files = append(files, file) } - if errList != nil { - return nil, errList + if anyChange { + finalizeRemovals(file) + pruneImports(file) } - return files, nil } +// isOnlyImports determines if this file is empty except for imports. +func isOnlyImports(file *ast.File) bool { + for _, decl := range file.Decls { + if gen, ok := decl.(*ast.GenDecl); ok && gen.Tok == token.IMPORT { + continue + } + + // The decl was either a FuncDecl or a non-import GenDecl. + return false + } + return true +} + +// pruneImports will remove any unused imports from the file. +// +// This will not remove any dot (`.`) or blank (`_`) imports, unless +// there are no declarations or directives meaning that all the imports +// should be cleared. +// If the removal of code causes an import to be removed, the init's from that +// import may not be run anymore. If we still need to run an init for an import +// which is no longer used, add it to the overlay as a blank (`_`) import. +// +// This uses the given name or guesses at the name using the import path, +// meaning this doesn't work for packages which have a different package name +// from the path, including those paths which are versioned +// (e.g. `github.com/foo/bar/v2` where the package name is `bar`) +// or if the import is defined using a relative path (e.g. `./..`). +// Those cases don't exist in the native for Go, so we should only run +// this pruning when we have native overlays, but not for unknown packages. +func pruneImports(file *ast.File) { + if isOnlyImports(file) && !astutil.HasDirectivePrefix(file, `//go:linkname `) { + // The file is empty, remove all imports including any `.` or `_` imports. + file.Imports = nil + file.Decls = nil + return + } + + unused := make(map[string]int, len(file.Imports)) + for i, in := range file.Imports { + if name := astutil.ImportName(in); len(name) > 0 { + unused[name] = i + } + } + + // Remove "unused imports" for any import which is used. + ast.Inspect(file, func(n ast.Node) bool { + if sel, ok := n.(*ast.SelectorExpr); ok { + if id, ok := sel.X.(*ast.Ident); ok && id.Obj == nil { + delete(unused, id.Name) + } + } + return len(unused) > 0 + }) + if len(unused) == 0 { + return + } + + // Remove "unused imports" for any import used for a directive. + directiveImports := map[string]string{ + `unsafe`: `//go:linkname `, + `embed`: `//go:embed `, + } + for name, index := range unused { + in := file.Imports[index] + path, _ := strconv.Unquote(in.Path.Value) + directivePrefix, hasPath := directiveImports[path] + if hasPath && astutil.HasDirectivePrefix(file, directivePrefix) { + // since the import is otherwise unused set the name to blank. + in.Name = ast.NewIdent(`_`) + delete(unused, name) + } + } + if len(unused) == 0 { + return + } + + // Remove all unused import specifications + isUnusedSpec := map[*ast.ImportSpec]bool{} + for _, index := range unused { + isUnusedSpec[file.Imports[index]] = true + } + for _, decl := range file.Decls { + if d, ok := decl.(*ast.GenDecl); ok { + for i, spec := range d.Specs { + if other, ok := spec.(*ast.ImportSpec); ok && isUnusedSpec[other] { + d.Specs[i] = nil + } + } + } + } + + // Remove the unused import copies in the file + for _, index := range unused { + file.Imports[index] = nil + } + + finalizeRemovals(file) +} + +// finalizeRemovals fully removes any declaration, specification, imports +// that have been set to nil. This will also remove any unassociated comment +// groups, including the comments from removed code. +func finalizeRemovals(file *ast.File) { + fileChanged := false + for i, decl := range file.Decls { + switch d := decl.(type) { + case nil: + fileChanged = true + case *ast.GenDecl: + declChanged := false + for j, spec := range d.Specs { + switch s := spec.(type) { + case nil: + declChanged = true + case *ast.ValueSpec: + specChanged := false + for _, name := range s.Names { + if name == nil { + specChanged = true + break + } + } + if specChanged { + s.Names = astutil.Squeeze(s.Names) + s.Values = astutil.Squeeze(s.Values) + if len(s.Names) == 0 { + declChanged = true + d.Specs[j] = nil + } + } + } + } + if declChanged { + d.Specs = astutil.Squeeze(d.Specs) + if len(d.Specs) == 0 { + fileChanged = true + file.Decls[i] = nil + } + } + } + } + if fileChanged { + file.Decls = astutil.Squeeze(file.Decls) + } + + file.Imports = astutil.Squeeze(file.Imports) + + file.Comments = nil // clear this first so ast.Inspect doesn't walk it. + remComments := []*ast.CommentGroup{} + ast.Inspect(file, func(n ast.Node) bool { + if cg, ok := n.(*ast.CommentGroup); ok { + remComments = append(remComments, cg) + } + return true + }) + file.Comments = remComments +} + +// Options controls build process behavior. type Options struct { - GOROOT string - GOPATH string Verbose bool Quiet bool Watch bool @@ -456,8 +605,11 @@ type Options struct { Minify bool Color bool BuildTags []string + TestedPackage string + NoCache bool } +// PrintError message to the terminal. func (o *Options) PrintError(format string, a ...interface{}) { if o.Color { format = "\x1B[31m" + format + "\x1B[39m" @@ -465,6 +617,7 @@ func (o *Options) PrintError(format string, a ...interface{}) { fmt.Fprintf(os.Stderr, format, a...) } +// PrintSuccess message to the terminal. func (o *Options) PrintSuccess(format string, a ...interface{}) { if o.Color { format = "\x1B[32m" + format + "\x1B[39m" @@ -472,43 +625,168 @@ func (o *Options) PrintSuccess(format string, a ...interface{}) { fmt.Fprintf(os.Stderr, format, a...) } +// PackageData is an extension of go/build.Package with additional metadata +// GopherJS requires. type PackageData struct { *build.Package - JSFiles []string - IsTest bool // IsTest is true if the package is being built for running tests. + JSFiles []jsFile.JSFile + // IsTest is true if the package is being built for running tests. + IsTest bool SrcModTime time.Time UpToDate bool - IsVirtual bool // If true, the package does not have a corresponding physical directory on disk. + // If true, the package does not have a corresponding physical directory on disk. + IsVirtual bool + + bctx *build.Context // The original build context this package came from. } -type Session struct { - options *Options - bctx *build.Context - Archives map[string]*compiler.Archive - Types map[string]*types.Package - Watcher *fsnotify.Watcher +func (p PackageData) String() string { + return fmt.Sprintf("%s [is_test=%v]", p.ImportPath, p.IsTest) } -func NewSession(options *Options) (*Session, error) { - if options.GOROOT == "" { - options.GOROOT = DefaultGOROOT +// FileModTime returns the most recent modification time of the package's source +// files. This includes all .go and .inc.js that would be included in the build, +// but excludes any dependencies. +func (p PackageData) FileModTime() time.Time { + newest := time.Time{} + for _, file := range p.JSFiles { + if file.ModTime.After(newest) { + newest = file.ModTime + } + } + + // Unfortunately, build.Context methods don't allow us to Stat and individual + // file, only to enumerate a directory. So we first get mtimes for all files + // in the package directory, and then pick the newest for the relevant GoFiles. + mtimes := map[string]time.Time{} + files, err := buildutil.ReadDir(p.bctx, p.Dir) + if err != nil { + log.Errorf("Failed to enumerate files in the %q in context %v: %s. Assuming time.Now().", p.Dir, p.bctx, err) + return time.Now() + } + for _, file := range files { + mtimes[file.Name()] = file.ModTime() } - if options.GOPATH == "" { - options.GOPATH = build.Default.GOPATH + + for _, file := range p.GoFiles { + t, ok := mtimes[file] + if !ok { + log.Errorf("No mtime found for source file %q of package %q, assuming time.Now().", file, p.Name) + return time.Now() + } + if t.After(newest) { + newest = t + } } + return newest +} + +// InternalBuildContext returns the build context that produced the package. +// +// WARNING: This function is a part of internal API and will be removed in +// future. +func (p *PackageData) InternalBuildContext() *build.Context { + return p.bctx +} + +// TestPackage returns a variant of the package with "internal" tests. +func (p *PackageData) TestPackage() *PackageData { + return &PackageData{ + Package: &build.Package{ + Name: p.Name, + ImportPath: p.ImportPath, + Dir: p.Dir, + GoFiles: append(p.GoFiles, p.TestGoFiles...), + Imports: append(p.Imports, p.TestImports...), + EmbedPatternPos: joinEmbedPatternPos(p.EmbedPatternPos, p.TestEmbedPatternPos), + }, + IsTest: true, + JSFiles: p.JSFiles, + bctx: p.bctx, + } +} + +// XTestPackage returns a variant of the package with "external" tests. +func (p *PackageData) XTestPackage() *PackageData { + return &PackageData{ + Package: &build.Package{ + Name: p.Name + "_test", + ImportPath: p.ImportPath + "_test", + Dir: p.Dir, + GoFiles: p.XTestGoFiles, + Imports: p.XTestImports, + EmbedPatternPos: p.XTestEmbedPatternPos, + }, + IsTest: true, + bctx: p.bctx, + } +} + +// InstallPath returns the path where "gopherjs install" command should place the +// generated output. +func (p *PackageData) InstallPath() string { + if p.IsCommand() { + name := filepath.Base(p.ImportPath) + ".js" + // For executable packages, mimic go tool behavior if possible. + if gobin := os.Getenv("GOBIN"); gobin != "" { + return filepath.Join(gobin, name) + } else if gopath := os.Getenv("GOPATH"); gopath != "" { + return filepath.Join(gopath, "bin", name) + } else if home, err := os.UserHomeDir(); err == nil { + return filepath.Join(home, "go", "bin", name) + } + } + return p.PkgObj +} + +// Session manages internal state GopherJS requires to perform a build. +// +// This is the main interface to GopherJS build system. Session lifetime is +// roughly equivalent to a single GopherJS tool invocation. +type Session struct { + options *Options + xctx XContext + + // importPaths is a map of the resolved import paths given the + // source directory (first key) and the unresolved import path (second key). + // This is used to cache the resolved import returned from XContext.Import. + // XContent.Import can be slow, so we cache the resolved path that is used + // as the map key by parsedPackages and UpToDateArchives. + // This makes subsequent lookups faster during compilation when all we have + // is the unresolved import path and source directory. + importPaths map[string]map[string]string + + // sources is a map of parsed packages that have been built and augmented. + // This is keyed using resolved import paths. This is used to avoid + // rebuilding and augmenting packages that are imported by several packages. + // The files in these sources haven't been sorted nor simplified yet. + sources map[string]*sources.Sources + + // Binary archives produced during the current session and assumed to be + // up to date with input sources and dependencies. In the -w ("watch") mode + // must be cleared upon entering watching. + UpToDateArchives map[string]*compiler.Archive + Watcher *fsnotify.Watcher +} + +// NewSession creates a new GopherJS build session. +func NewSession(options *Options) (*Session, error) { options.Verbose = options.Verbose || options.Watch + s := &Session{ + options: options, + importPaths: make(map[string]map[string]string), + sources: make(map[string]*sources.Sources), + UpToDateArchives: make(map[string]*compiler.Archive), + } + s.xctx = NewBuildContext(s.InstallSuffix(), s.options.BuildTags) + env := s.xctx.Env() + // Go distribution version check. - if err := compiler.CheckGoVersion(options.GOROOT); err != nil { + if err := compiler.CheckGoVersion(env.GOROOT); err != nil { return nil, err } - s := &Session{ - options: options, - Archives: make(map[string]*compiler.Archive), - } - s.bctx = NewBuildContext(s.InstallSuffix(), s.options.BuildTags) - s.Types = make(map[string]*types.Package) if options.Watch { if out, err := exec.Command("ulimit", "-n").Output(); err == nil { if n, err := strconv.Atoi(strings.TrimSpace(string(out))); err == nil && n < 1024 { @@ -525,9 +803,10 @@ func NewSession(options *Options) (*Session, error) { return s, nil } -// BuildContext returns the session's build context. -func (s *Session) BuildContext() *build.Context { return s.bctx } +// XContext returns the session's build context. +func (s *Session) XContext() XContext { return s.xctx } +// InstallSuffix returns the suffix added to the generated output file. func (s *Session) InstallSuffix() string { if s.options.Minify { return "min" @@ -535,69 +814,187 @@ func (s *Session) InstallSuffix() string { return "" } -func (s *Session) BuildDir(packagePath string, importPath string, pkgObj string) error { - if s.Watcher != nil { - s.Watcher.Add(packagePath) +// GoRelease returns Go release version this session is building with. +func (s *Session) GoRelease() string { + return compiler.GoRelease(s.xctx.Env().GOROOT) +} + +// BuildFiles passed to the GopherJS tool as if they were a package. +// +// A ephemeral package will be created with only the provided files. This +// function is intended for use with, for example, `gopherjs run main.go`. +func (s *Session) BuildFiles(filenames []string, pkgObj string, cwd string) error { + if len(filenames) == 0 { + return fmt.Errorf("no input sources are provided") } - buildPkg, err := s.bctx.ImportDir(packagePath, 0) - if err != nil { - return err + + normalizedDir := func(filename string) string { + d := filepath.Dir(filename) + if !filepath.IsAbs(d) { + d = filepath.Join(cwd, d) + } + return filepath.Clean(d) } - pkg := &PackageData{Package: buildPkg} - jsFiles, err := jsFilesFromDir(s.bctx, pkg.Dir) - if err != nil { - return err + + // Ensure all source files are in the same directory. + dirSet := map[string]bool{} + for _, file := range filenames { + dirSet[normalizedDir(file)] = true } - pkg.JSFiles = jsFiles - archive, err := s.BuildPackage(pkg) - if err != nil { - return err + dirList := []string{} + for dir := range dirSet { + dirList = append(dirList, dir) } - if pkgObj == "" { - pkgObj = filepath.Base(packagePath) + ".js" + sort.Strings(dirList) + if len(dirList) != 1 { + return fmt.Errorf("named files must all be in one directory; have: %v", strings.Join(dirList, ", ")) } - if pkg.IsCommand() && !pkg.UpToDate { - if err := s.WriteCommandPackage(archive, pkgObj); err != nil { - return err + + root := dirList[0] + ctx := build.Default + ctx.UseAllFiles = true + ctx.ReadDir = func(dir string) ([]fs.FileInfo, error) { + n := len(filenames) + infos := make([]fs.FileInfo, n) + for i := 0; i < n; i++ { + info, err := os.Stat(filenames[i]) + if err != nil { + return nil, err + } + infos[i] = info } + return infos, nil } - return nil -} + p, err := ctx.Import(".", root, 0) + if err != nil { + return err + } + p.Name = "main" + p.ImportPath = "main" -func (s *Session) BuildFiles(filenames []string, pkgObj string, packagePath string) error { pkg := &PackageData{ - Package: &build.Package{ - Name: "main", - ImportPath: "main", - Dir: packagePath, - }, + Package: p, + // This ephemeral package doesn't have a unique import path to be used as a + // build cache key, so we never cache it. + SrcModTime: time.Now().Add(time.Hour), + bctx: &goCtx(s.xctx.Env()).bctx, } for _, file := range filenames { - if strings.HasSuffix(file, ".inc.js") { - pkg.JSFiles = append(pkg.JSFiles, file) + if !strings.HasSuffix(file, ".inc.js") { continue } - pkg.GoFiles = append(pkg.GoFiles, file) + + content, err := os.ReadFile(file) + if err != nil { + return fmt.Errorf("failed to read %s: %w", file, err) + } + info, err := os.Stat(file) + if err != nil { + return fmt.Errorf("failed to stat %s: %w", file, err) + } + pkg.JSFiles = append(pkg.JSFiles, jsFile.JSFile{ + Path: filepath.Join(pkg.Dir, filepath.Base(file)), + ModTime: info.ModTime(), + Content: content, + }) } - archive, err := s.BuildPackage(pkg) + archive, err := s.BuildProject(pkg) if err != nil { return err } - if s.Types["main"].Name() != "main" { + if s.sources["main"].Package.Name() != "main" { return fmt.Errorf("cannot build/run non-main package") } return s.WriteCommandPackage(archive, pkgObj) } -func (s *Session) BuildImportPath(path string) (*compiler.Archive, error) { - _, archive, err := s.buildImportPathWithSrcDir(path, "") - return archive, err +// BuildProject builds a command project (one with a main method) or +// builds a test project (one with a synthesized test main package). +func (s *Session) BuildProject(pkg *PackageData) (*compiler.Archive, error) { + // ensure that runtime for gopherjs is imported + pkg.Imports = append(pkg.Imports, `runtime`) + + // Load the project to get the sources for the parsed packages. + var rootSrcs *sources.Sources + var err error + if pkg.IsTest { + rootSrcs, err = s.loadTestPackage(pkg) + } else { + rootSrcs, err = s.loadPackages(pkg) + } + if err != nil { + return nil, err + } + + // TODO(grantnelson-wf): We could investigate caching the results of + // the sources prior to preparing them to avoid re-parsing the same + // sources and augmenting them when the files on disk haven't changed. + // This would require a way to determine if the sources are up-to-date + // which could be done with the left over srcModTime from when the archives + // were being cached. + + // Compile the project into Archives containing the generated JS. + return s.prepareAndCompilePackages(rootSrcs) +} + +// getSortedSources returns the sources sorted by import path. +// The files in the sources may still not be sorted yet. +func (s *Session) getSortedSources() []*sources.Sources { + allSources := make([]*sources.Sources, 0, len(s.sources)) + for _, srcs := range s.sources { + allSources = append(allSources, srcs) + } + sources.SortedSourcesSlice(allSources) + return allSources +} + +func (s *Session) loadTestPackage(pkg *PackageData) (*sources.Sources, error) { + _, err := s.loadPackages(pkg.TestPackage()) + if err != nil { + return nil, err + } + _, err = s.loadPackages(pkg.XTestPackage()) + if err != nil { + return nil, err + } + + // Generate a synthetic testmain package. + fset := token.NewFileSet() + tests := testmain.TestMain{Package: pkg.Package, Context: pkg.bctx} + tests.Scan(fset) + mainPkg, mainFile, err := tests.Synthesize(fset) + if err != nil { + return nil, fmt.Errorf("failed to generate testmain package for %s: %w", pkg.ImportPath, err) + } + + // Create the sources for parsed package for the testmain package. + srcs := &sources.Sources{ + ImportPath: mainPkg.ImportPath, + Dir: mainPkg.Dir, + Files: []*ast.File{mainFile}, + FileSet: fset, + } + s.sources[srcs.ImportPath] = srcs + + // Import dependencies for the testmain package. + for _, importedPkgPath := range srcs.UnresolvedImports() { + _, _, err := s.loadImportPathWithSrcDir(importedPkgPath, pkg.Dir) + if err != nil { + return nil, err + } + } + + return srcs, nil } -func (s *Session) buildImportPathWithSrcDir(path string, srcDir string) (*PackageData, *compiler.Archive, error) { - pkg, err := importWithSrcDir(*s.bctx, path, srcDir, 0, s.InstallSuffix()) +// loadImportPathWithSrcDir gets the parsed package specified by the import path. +// +// Relative import paths are interpreted relative to the passed srcDir. +// If srcDir is empty, current working directory is assumed. +func (s *Session) loadImportPathWithSrcDir(path, srcDir string) (*PackageData, *sources.Sources, error) { + pkg, err := s.xctx.Import(path, srcDir, 0) if s.Watcher != nil && pkg != nil { // add watch even on error s.Watcher.Add(pkg.Dir) } @@ -605,174 +1002,229 @@ func (s *Session) buildImportPathWithSrcDir(path string, srcDir string) (*Packag return nil, nil, err } - archive, err := s.BuildPackage(pkg) + srcs, err := s.loadPackages(pkg) if err != nil { return nil, nil, err } - return pkg, archive, nil + s.cacheImportPath(path, srcDir, pkg.ImportPath) + return pkg, srcs, nil } -func (s *Session) BuildPackage(pkg *PackageData) (*compiler.Archive, error) { - if archive, ok := s.Archives[pkg.ImportPath]; ok { - return archive, nil +// cacheImportPath stores the resolved import path for the build package +// so we can look it up later without getting the whole build package. +// The given path and source directly are the ones passed into +// XContext.Import to the get the build package originally. +func (s *Session) cacheImportPath(path, srcDir, importPath string) { + if paths, ok := s.importPaths[srcDir]; ok { + paths[path] = importPath + } else { + s.importPaths[srcDir] = map[string]string{path: importPath} } +} - if pkg.PkgObj != "" { - var fileInfo os.FileInfo +// getExeModTime will determine the mod time of the GopherJS binary +// the first time this is called and cache the result for subsequent calls. +var getExeModTime = func() func() time.Time { + var ( + once sync.Once + result time.Time + ) + getTime := func() { gopherjsBinary, err := os.Executable() if err == nil { + var fileInfo os.FileInfo fileInfo, err = os.Stat(gopherjsBinary) if err == nil { - pkg.SrcModTime = fileInfo.ModTime() - } - } - if err != nil { - os.Stderr.WriteString("Could not get GopherJS binary's modification timestamp. Please report issue.\n") - pkg.SrcModTime = time.Now() - } - - for _, importedPkgPath := range pkg.Imports { - // Ignore all imports that aren't mentioned in import specs of pkg. - // For example, this ignores imports such as runtime/internal/sys and runtime/internal/atomic. - ignored := true - for _, pos := range pkg.ImportPos[importedPkgPath] { - importFile := filepath.Base(pos.Filename) - for _, file := range pkg.GoFiles { - if importFile == file { - ignored = false - break - } - } - if !ignored { - break - } - } - - if importedPkgPath == "unsafe" || ignored { - continue - } - importedPkg, _, err := s.buildImportPathWithSrcDir(importedPkgPath, pkg.Dir) - if err != nil { - return nil, err - } - impModTime := importedPkg.SrcModTime - if impModTime.After(pkg.SrcModTime) { - pkg.SrcModTime = impModTime - } - } - - for _, name := range append(pkg.GoFiles, pkg.JSFiles...) { - fileInfo, err := statFile(filepath.Join(pkg.Dir, name)) - if err != nil { - return nil, err - } - if fileInfo.ModTime().After(pkg.SrcModTime) { - pkg.SrcModTime = fileInfo.ModTime() + result = fileInfo.ModTime() + return } } + os.Stderr.WriteString("Could not get GopherJS binary's modification timestamp. Please report issue.\n") + result = time.Now() + } + return func() time.Time { + once.Do(getTime) + return result + } +}() - pkgObjFileInfo, err := os.Stat(pkg.PkgObj) - if err == nil && !pkg.SrcModTime.After(pkgObjFileInfo.ModTime()) { - // package object is up to date, load from disk if library - pkg.UpToDate = true - if pkg.IsCommand() { - return nil, nil - } +// loadPackages will recursively load and parse the given package and +// its dependencies. This will return the sources for the given package. +// The returned source and sources for the dependencies will be added +// to the session's sources map. +func (s *Session) loadPackages(pkg *PackageData) (*sources.Sources, error) { + if srcs, ok := s.sources[pkg.ImportPath]; ok { + return srcs, nil + } - objFile, err := os.Open(pkg.PkgObj) - if err != nil { - return nil, err - } - defer objFile.Close() + if exeModTime := getExeModTime(); exeModTime.After(pkg.SrcModTime) { + pkg.SrcModTime = exeModTime + } - archive, err := compiler.ReadArchive(pkg.PkgObj, pkg.ImportPath, objFile, s.Types) - if err != nil { - return nil, err - } + for _, importedPkgPath := range pkg.Imports { + if importedPkgPath == "unsafe" { + continue + } + importedPkg, _, err := s.loadImportPathWithSrcDir(importedPkgPath, pkg.Dir) + if err != nil { + return nil, err + } - s.Archives[pkg.ImportPath] = archive - return archive, err + if impModTime := importedPkg.SrcModTime; impModTime.After(pkg.SrcModTime) { + pkg.SrcModTime = impModTime } } + if fileModTime := pkg.FileModTime(); fileModTime.After(pkg.SrcModTime) { + pkg.SrcModTime = fileModTime + } + + // Build the package by parsing and augmenting the original files with overlay files. fileSet := token.NewFileSet() - files, err := parseAndAugment(s.bctx, pkg.Package, pkg.IsTest, fileSet) + files, overlayJsFiles, err := parseAndAugment(s.xctx, pkg, pkg.IsTest, fileSet) if err != nil { return nil, err } - - localImportPathCache := make(map[string]*compiler.Archive) - importContext := &compiler.ImportContext{ - Packages: s.Types, - Import: func(path string) (*compiler.Archive, error) { - if archive, ok := localImportPathCache[path]; ok { - return archive, nil - } - _, archive, err := s.buildImportPathWithSrcDir(path, pkg.Dir) - if err != nil { - return nil, err - } - localImportPathCache[path] = archive - return archive, nil - }, - } - archive, err := compiler.Compile(pkg.ImportPath, files, fileSet, importContext, s.options.Minify) + embed, err := embedFiles(pkg, fileSet, files) if err != nil { return nil, err } + if embed != nil { + files = append(files, embed) + } + + srcs := &sources.Sources{ + ImportPath: pkg.ImportPath, + Dir: pkg.Dir, + Files: files, + FileSet: fileSet, + JSFiles: append(pkg.JSFiles, overlayJsFiles...), + } + s.sources[pkg.ImportPath] = srcs - for _, jsFile := range pkg.JSFiles { - code, err := ioutil.ReadFile(filepath.Join(pkg.Dir, jsFile)) + // Import dependencies from the augmented files, + // whilst skipping any that have been already imported. + for _, importedPkgPath := range srcs.UnresolvedImports(pkg.Imports...) { + _, _, err := s.loadImportPathWithSrcDir(importedPkgPath, pkg.Dir) if err != nil { return nil, err } - archive.IncJSCode = append(archive.IncJSCode, []byte("\t(function() {\n")...) - archive.IncJSCode = append(archive.IncJSCode, code...) - archive.IncJSCode = append(archive.IncJSCode, []byte("\n\t}).call($global);\n")...) } - if s.options.Verbose { - fmt.Println(pkg.ImportPath) + return srcs, nil +} + +func (s *Session) prepareAndCompilePackages(rootSrcs *sources.Sources) (*compiler.Archive, error) { + tContext := types.NewContext() + allSources := s.getSortedSources() + + // Prepare and analyze the source code. + // This will be performed recursively for all dependencies. + if err := compiler.PrepareAllSources(allSources, s.SourcesForImport, tContext); err != nil { + return nil, err } - s.Archives[pkg.ImportPath] = archive + // Compile all the sources into archives. + for _, srcs := range allSources { + if _, err := s.compilePackage(srcs, tContext); err != nil { + return nil, err + } + } - if pkg.PkgObj == "" || pkg.IsCommand() { + rootArchive, ok := s.UpToDateArchives[rootSrcs.ImportPath] + if !ok { + // This is confirmation that the root package is in the sources map and got compiled. + return nil, fmt.Errorf(`root package %q was not found in archives`, rootSrcs.ImportPath) + } + return rootArchive, nil +} + +func (s *Session) compilePackage(srcs *sources.Sources, tContext *types.Context) (*compiler.Archive, error) { + if archive, ok := s.UpToDateArchives[srcs.ImportPath]; ok { return archive, nil } - if err := s.writeLibraryPackage(archive, pkg.PkgObj); err != nil { - if strings.HasPrefix(pkg.PkgObj, s.options.GOROOT) { - // fall back to first GOPATH workspace - firstGopathWorkspace := filepath.SplitList(s.options.GOPATH)[0] - if err := s.writeLibraryPackage(archive, filepath.Join(firstGopathWorkspace, pkg.PkgObj[len(s.options.GOROOT):])); err != nil { - return nil, err - } - return archive, nil - } + archive, err := compiler.Compile(srcs, tContext, s.options.Minify) + if err != nil { return nil, err } + for _, jsFile := range srcs.JSFiles { + archive.IncJSCode = append(archive.IncJSCode, []byte("\t(function() {\n")...) + archive.IncJSCode = append(archive.IncJSCode, jsFile.Content...) + archive.IncJSCode = append(archive.IncJSCode, []byte("\n\t}).call($global);\n")...) + } + + if s.options.Verbose { + fmt.Println(srcs.ImportPath) + } + + s.UpToDateArchives[srcs.ImportPath] = archive + return archive, nil } -func (s *Session) writeLibraryPackage(archive *compiler.Archive, pkgObj string) error { - if err := os.MkdirAll(filepath.Dir(pkgObj), 0777); err != nil { - return err +func (s *Session) getImportPath(path, srcDir string) (string, error) { + // If path is for an xtest package, just return it. + if strings.HasSuffix(path, "_test") { + return path, nil + } + + // Check if the import path is already cached. + if importPath, ok := s.importPaths[srcDir][path]; ok { + return importPath, nil } - objFile, err := os.Create(pkgObj) + // Fall back to the slow import of the build package. + pkg, err := s.xctx.Import(path, srcDir, 0) if err != nil { - return err + return ``, err + } + s.cacheImportPath(path, srcDir, pkg.ImportPath) + return pkg.ImportPath, nil +} + +func (s *Session) SourcesForImport(path, srcDir string) (*sources.Sources, error) { + importPath, err := s.getImportPath(path, srcDir) + if err != nil { + return nil, err + } + + srcs, ok := s.sources[importPath] + if !ok { + return nil, fmt.Errorf(`sources for %q not found`, path) } - defer objFile.Close() - return compiler.WriteArchive(archive, objFile) + return srcs, nil } +// ImportResolverFor returns a function which returns a compiled package archive +// given an import path. +func (s *Session) ImportResolverFor(srcDir string) func(string) (*compiler.Archive, error) { + return func(path string) (*compiler.Archive, error) { + importPath, err := s.getImportPath(path, srcDir) + if err != nil { + return nil, err + } + + if archive, ok := s.UpToDateArchives[importPath]; ok { + return archive, nil + } + + return nil, fmt.Errorf(`archive for %q not found`, importPath) + } +} + +// SourceMappingCallback returns a call back for compiler.SourceMapFilter +// configured for the current build session. +func (s *Session) SourceMappingCallback(m *sourcemap.Map) func(generatedLine, generatedColumn int, originalPos token.Position) { + return NewMappingCallback(m, s.xctx.Env().GOROOT, s.xctx.Env().GOPATH, s.options.MapToLocalDisk) +} + +// WriteCommandPackage writes the final JavaScript output file at pkgObj path. func (s *Session) WriteCommandPackage(archive *compiler.Archive, pkgObj string) error { - if err := os.MkdirAll(filepath.Dir(pkgObj), 0777); err != nil { + if err := os.MkdirAll(filepath.Dir(pkgObj), 0o777); err != nil { return err } codeFile, err := os.Create(pkgObj) @@ -795,22 +1247,17 @@ func (s *Session) WriteCommandPackage(archive *compiler.Archive, pkgObj string) fmt.Fprintf(codeFile, "//# sourceMappingURL=%s.map\n", filepath.Base(pkgObj)) }() - sourceMapFilter.MappingCallback = NewMappingCallback(m, s.options.GOROOT, s.options.GOPATH, s.options.MapToLocalDisk) + sourceMapFilter.MappingCallback = s.SourceMappingCallback(m) } - deps, err := compiler.ImportDependencies(archive, func(path string) (*compiler.Archive, error) { - if archive, ok := s.Archives[path]; ok { - return archive, nil - } - _, archive, err := s.buildImportPathWithSrcDir(path, "") - return archive, err - }) + deps, err := compiler.ImportDependencies(archive, s.ImportResolverFor("")) if err != nil { return err } - return compiler.WriteProgramCode(deps, sourceMapFilter) + return compiler.WriteProgramCode(deps, sourceMapFilter, s.GoRelease()) } +// NewMappingCallback creates a new callback for source map generation. func NewMappingCallback(m *sourcemap.Map, goroot, gopath string, localMap bool) func(generatedLine, generatedColumn int, originalPos token.Position) { return func(generatedLine, generatedColumn int, originalPos token.Position) { if !originalPos.IsValid() { @@ -835,20 +1282,6 @@ func NewMappingCallback(m *sourcemap.Map, goroot, gopath string, localMap bool) } } -func jsFilesFromDir(bctx *build.Context, dir string) ([]string, error) { - files, err := buildutil.ReadDir(bctx, dir) - if err != nil { - return nil, err - } - var jsFiles []string - for _, file := range files { - if strings.HasSuffix(file.Name(), ".inc.js") && file.Name()[0] != '_' && file.Name()[0] != '.' { - jsFiles = append(jsFiles, file.Name()) - } - } - return jsFiles, nil -} - // hasGopathPrefix returns true and the length of the matched GOPATH workspace, // iff file has a prefix that matches one of the GOPATH workspaces. func hasGopathPrefix(file, gopath string) (hasGopathPrefix bool, prefixLen int) { @@ -862,7 +1295,15 @@ func hasGopathPrefix(file, gopath string) (hasGopathPrefix bool, prefixLen int) return false, 0 } +// WaitForChange watches file system events and returns if either when one of +// the source files is modified. func (s *Session) WaitForChange() { + // Will need to re-validate up-to-dateness of all archives, so flush them from + // memory. + s.importPaths = map[string]map[string]string{} + s.sources = map[string]*sources.Sources{} + s.UpToDateArchives = map[string]*compiler.Archive{} + s.options.PrintSuccess("watching for changes...\n") for { select { diff --git a/build/build_test.go b/build/build_test.go index 659aff3e3..7bda7f54a 100644 --- a/build/build_test.go +++ b/build/build_test.go @@ -5,10 +5,9 @@ import ( gobuild "go/build" "go/token" "strconv" - "strings" "testing" - "github.com/kisielk/gotool" + "github.com/gopherjs/gopherjs/internal/srctesting" "github.com/shurcooL/go/importgraphutil" ) @@ -24,9 +23,13 @@ import ( func TestNativesDontImportExtraPackages(t *testing.T) { // Calculate the forward import graph for all standard library packages. // It's needed for populateImportSet. - stdOnly := gobuild.Default - stdOnly.GOPATH = "" // We only care about standard library, so skip all GOPATH packages. - forward, _, err := importgraphutil.BuildNoTests(&stdOnly) + stdOnly := goCtx(DefaultEnv()) + // Skip post-load package tweaks, since we are interested in the complete set + // of original sources. + stdOnly.noPostTweaks = true + // We only care about standard library, so skip all GOPATH packages. + stdOnly.bctx.GOPATH = "" + forward, _, err := importgraphutil.BuildNoTests(&stdOnly.bctx) if err != nil { t.Fatalf("importgraphutil.BuildNoTests: %v", err) } @@ -38,18 +41,20 @@ func TestNativesDontImportExtraPackages(t *testing.T) { // Note, this does not include transitive imports of test/xtest packages, // which could cause some false positives. It currently doesn't, but if it does, // then support for that should be added here. - populateImportSet := func(imports []string, set *stringSet) { + populateImportSet := func(imports []string) stringSet { + set := stringSet{} for _, p := range imports { - (*set)[p] = struct{}{} + set[p] = struct{}{} switch p { case "sync": - (*set)["github.com/gopherjs/gopherjs/nosync"] = struct{}{} + set["github.com/gopherjs/gopherjs/nosync"] = struct{}{} } transitiveImports := forward.Search(p) for p := range transitiveImports { - (*set)[p] = struct{}{} + set[p] = struct{}{} } } + return set } // Check all standard library packages. @@ -64,136 +69,672 @@ func TestNativesDontImportExtraPackages(t *testing.T) { // Then, github.com/gopherjs/gopherjs/build.parseAndAugment(*build.Package) returns []*ast.File. // Those augmented parsed Go files of the package are checked, one file at at time, one import // at a time. Each import is verified to belong in the set of allowed real imports. - for _, pkg := range gotool.ImportPaths([]string{"std"}) { - // Normal package. - { - // Import the real normal package, and populate its real import set. - bpkg, err := gobuild.Import(pkg, "", gobuild.ImportComment) + matches, matchErr := stdOnly.Match([]string{"std"}) + if matchErr != nil { + t.Fatalf("Failed to list standard library packages: %s", err) + } + for _, pkgName := range matches { + pkgName := pkgName // Capture for the goroutine. + t.Run(pkgName, func(t *testing.T) { + t.Parallel() + + pkg, err := stdOnly.Import(pkgName, "", gobuild.ImportComment) if err != nil { t.Fatalf("gobuild.Import: %v", err) } - realImports := make(stringSet) - populateImportSet(bpkg.Imports, &realImports) - // Use parseAndAugment to get a list of augmented AST files. - fset := token.NewFileSet() - files, err := parseAndAugment(NewBuildContext("", nil), bpkg, false, fset) - if err != nil { - t.Fatalf("github.com/gopherjs/gopherjs/build.parseAndAugment: %v", err) - } + for _, pkgVariant := range []*PackageData{pkg, pkg.TestPackage(), pkg.XTestPackage()} { + t.Logf("Checking package %s...", pkgVariant) + + // Capture the set of unmodified package imports. + realImports := populateImportSet(pkgVariant.Imports) - // Verify imports of normal augmented AST files. - for _, f := range files { - fileName := fset.File(f.Pos()).Name() - normalFile := !strings.HasSuffix(fileName, "_test.go") - if !normalFile { - continue + // Use parseAndAugment to get a list of augmented AST files. + fset := token.NewFileSet() + files, _, err := parseAndAugment(stdOnly, pkgVariant, pkgVariant.IsTest, fset) + if err != nil { + t.Fatalf("github.com/gopherjs/gopherjs/build.parseAndAugment: %v", err) } - for _, imp := range f.Imports { - importPath, err := strconv.Unquote(imp.Path.Value) - if err != nil { - t.Fatalf("strconv.Unquote(%v): %v", imp.Path.Value, err) - } - if importPath == "github.com/gopherjs/gopherjs/js" { - continue - } - if _, ok := realImports[importPath]; !ok { - t.Errorf("augmented normal package %q imports %q in file %v, but real %q doesn't:\nrealImports = %v", bpkg.ImportPath, importPath, fileName, bpkg.ImportPath, realImports) + + // Verify imports of augmented AST files. + for _, f := range files { + fileName := fset.File(f.Pos()).Name() + for _, imp := range f.Imports { + importPath, err := strconv.Unquote(imp.Path.Value) + if err != nil { + t.Fatalf("strconv.Unquote(%v): %v", imp.Path.Value, err) + } + if importPath == "github.com/gopherjs/gopherjs/js" { + continue + } + if _, ok := realImports[importPath]; !ok { + t.Errorf("augmented package %q imports %q in file %v, but real %q doesn't:\nrealImports = %v", + pkgVariant, importPath, fileName, pkgVariant.ImportPath, realImports) + } } } } - } + }) + } +} - // Test package. +// stringSet is used to print a set of strings in a more readable way. +type stringSet map[string]struct{} + +func (m stringSet) String() string { + s := make([]string, 0, len(m)) + for v := range m { + s = append(s, v) + } + return fmt.Sprintf("%q", s) +} + +func TestOverlayAugmentation(t *testing.T) { + tests := []struct { + desc string + src string + noCodeChange bool + want string + expInfo map[string]overrideInfo + }{ { - // Import the real test package, and populate its real import set. - bpkg, err := gobuild.Import(pkg, "", gobuild.ImportComment) - if err != nil { - t.Fatalf("gobuild.Import: %v", err) + desc: `remove function`, + src: `func Foo(a, b int) int { + return a + b + }`, + noCodeChange: true, + expInfo: map[string]overrideInfo{ + `Foo`: {}, + }, + }, { + desc: `keep function`, + src: `//gopherjs:keep-original + func Foo(a, b int) int { + return a + b + }`, + noCodeChange: true, + expInfo: map[string]overrideInfo{ + `Foo`: {keepOriginal: true}, + }, + }, { + desc: `remove constants and values`, + src: `import "time" + + const ( + foo = 42 + bar = "gopherjs" + ) + + var now = time.Now`, + noCodeChange: true, + expInfo: map[string]overrideInfo{ + `foo`: {}, + `bar`: {}, + `now`: {}, + }, + }, { + desc: `remove types`, + src: `type ( + foo struct {} + bar int + ) + + type bob interface {}`, + noCodeChange: true, + expInfo: map[string]overrideInfo{ + `foo`: {}, + `bar`: {}, + `bob`: {}, + }, + }, { + desc: `remove methods`, + src: `type Foo struct { + bar int + } + + func (x *Foo) GetBar() int { return x.bar } + func (x *Foo) SetBar(bar int) { x.bar = bar }`, + noCodeChange: true, + expInfo: map[string]overrideInfo{ + `Foo`: {}, + `Foo.GetBar`: {}, + `Foo.SetBar`: {}, + }, + }, { + desc: `remove generics`, + src: `import "cmp" + + type Pointer[T any] struct {} + + func Sort[S ~[]E, E cmp.Ordered](x S) {} + + // this is a stub for "func Equal[S ~[]E, E any](s1, s2 S) bool {}" + func Equal[S ~[]E, E any](s1, s2 S) bool {}`, + noCodeChange: true, + expInfo: map[string]overrideInfo{ + `Pointer`: {}, + `Sort`: {}, + `Equal`: {}, + }, + }, { + desc: `prune an unused import`, + src: `import foo "some/other/bar"`, + want: ``, + expInfo: map[string]overrideInfo{}, + }, { + desc: `purge function`, + src: `//gopherjs:purge + func Foo(a, b int) int { + return a + b + }`, + want: ``, + expInfo: map[string]overrideInfo{ + `Foo`: {}, + }, + }, { + desc: `purge struct removes an import`, + src: `import "bytes" + import "math" + + //gopherjs:purge + type Foo struct { + bar *bytes.Buffer + } + + const Tau = math.Pi * 2.0`, + want: `import "math" + + const Tau = math.Pi * 2.0`, + expInfo: map[string]overrideInfo{ + `Foo`: {purgeMethods: true}, + `Tau`: {}, + }, + }, { + desc: `purge whole type decl`, + src: `//gopherjs:purge + type ( + Foo struct {} + bar interface{} + bob int + )`, + want: ``, + expInfo: map[string]overrideInfo{ + `Foo`: {purgeMethods: true}, + `bar`: {purgeMethods: true}, + `bob`: {purgeMethods: true}, + }, + }, { + desc: `purge part of type decl`, + src: `type ( + Foo struct {} + + //gopherjs:purge + bar interface{} + + //gopherjs:purge + bob int + )`, + want: `type ( + Foo struct {} + )`, + expInfo: map[string]overrideInfo{ + `Foo`: {}, + `bar`: {purgeMethods: true}, + `bob`: {purgeMethods: true}, + }, + }, { + desc: `purge all of a type decl`, + src: `type ( + //gopherjs:purge + Foo struct {} + )`, + want: ``, + expInfo: map[string]overrideInfo{ + `Foo`: {purgeMethods: true}, + }, + }, { + desc: `remove and purge values`, + src: `import "time" + + const ( + foo = 42 + //gopherjs:purge + bar = "gopherjs" + ) + + //gopherjs:purge + var now = time.Now`, + want: `const ( + foo = 42 + )`, + expInfo: map[string]overrideInfo{ + `foo`: {}, + `bar`: {}, + `now`: {}, + }, + }, { + desc: `purge all value names`, + src: `//gopherjs:purge + var foo, bar int + + //gopherjs:purge + const bob, sal = 12, 42`, + want: ``, + expInfo: map[string]overrideInfo{ + `foo`: {}, + `bar`: {}, + `bob`: {}, + `sal`: {}, + }, + }, { + desc: `imports not confused by local variables`, + src: `import ( + "cmp" + "time" + ) + + //gopherjs:purge + func Sort[S ~[]E, E cmp.Ordered](x S) {} + + func SecondsSince(start time.Time) int { + cmp := time.Now().Sub(start) + return int(cmp.Second()) + }`, + want: `import ( + "time" + ) + + func SecondsSince(start time.Time) int { + cmp := time.Now().Sub(start) + return int(cmp.Second()) + }`, + expInfo: map[string]overrideInfo{ + `Sort`: {}, + `SecondsSince`: {}, + }, + }, { + desc: `purge generics`, + src: `import "cmp" + + //gopherjs:purge + type Pointer[T any] struct {} + + //gopherjs:purge + func Sort[S ~[]E, E cmp.Ordered](x S) {} + + // stub for "func Equal[S ~[]E, E any](s1, s2 S) bool" + func Equal() {}`, + want: `// stub for "func Equal[S ~[]E, E any](s1, s2 S) bool" + func Equal() {}`, + expInfo: map[string]overrideInfo{ + `Pointer`: {purgeMethods: true}, + `Sort`: {}, + `Equal`: {}, + }, + }, { + desc: `remove unsafe and embed if not needed`, + src: `import "unsafe" + import "embed" + + //gopherjs:purge + var eFile embed.FS + + //gopherjs:purge + func SwapPointer(addr *unsafe.Pointer, new unsafe.Pointer) (old unsafe.Pointer)`, + want: ``, + expInfo: map[string]overrideInfo{ + `SwapPointer`: {}, + `eFile`: {}, + }, + }, { + desc: `keep unsafe and embed for directives`, + src: `import "unsafe" + import "embed" + + //go:embed hello.txt + var eFile embed.FS + + //go:linkname runtimeNano runtime.nanotime + func runtimeNano() int64`, + want: `import _ "unsafe" + import "embed" + + //go:embed hello.txt + var eFile embed.FS + + //go:linkname runtimeNano runtime.nanotime + func runtimeNano() int64`, + expInfo: map[string]overrideInfo{ + `eFile`: {}, + `runtimeNano`: {}, + }, + }, + } + + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + const pkgName = "package testpackage\n\n" + if test.noCodeChange { + test.want = test.src } - realTestImports := make(stringSet) - populateImportSet(bpkg.TestImports, &realTestImports) - // Use parseAndAugment to get a list of augmented AST files. - fset := token.NewFileSet() - files, err := parseAndAugment(NewBuildContext("", nil), bpkg, true, fset) - if err != nil { - t.Fatalf("github.com/gopherjs/gopherjs/build.parseAndAugment: %v", err) + f := srctesting.New(t) + fileSrc := f.Parse("test.go", pkgName+test.src) + + overrides := map[string]overrideInfo{} + augmentOverlayFile(fileSrc, overrides) + pruneImports(fileSrc) + + got := srctesting.Format(t, f.FileSet, fileSrc) + + fileWant := f.Parse("test.go", pkgName+test.want) + want := srctesting.Format(t, f.FileSet, fileWant) + + if got != want { + t.Errorf("augmentOverlayFile and pruneImports got unexpected code:\n"+ + "returned:\n\t%q\nwant:\n\t%q", got, want) } - // Verify imports of test augmented AST files. - for _, f := range files { - fileName, pkgName := fset.File(f.Pos()).Name(), f.Name.String() - testFile := strings.HasSuffix(fileName, "_test.go") && !strings.HasSuffix(pkgName, "_test") - if !testFile { - continue + for key, expInfo := range test.expInfo { + if gotInfo, ok := overrides[key]; !ok { + t.Errorf(`%q was expected but not gotten`, key) + } else if expInfo != gotInfo { + t.Errorf(`%q had wrong info, got %+v`, key, gotInfo) } - for _, imp := range f.Imports { - importPath, err := strconv.Unquote(imp.Path.Value) - if err != nil { - t.Fatalf("strconv.Unquote(%v): %v", imp.Path.Value, err) - } - if importPath == "github.com/gopherjs/gopherjs/js" { - continue - } - if _, ok := realTestImports[importPath]; !ok { - t.Errorf("augmented test package %q imports %q in file %v, but real %q doesn't:\nrealTestImports = %v", bpkg.ImportPath, importPath, fileName, bpkg.ImportPath, realTestImports) - } + } + for key, gotInfo := range overrides { + if _, ok := test.expInfo[key]; !ok { + t.Errorf(`%q with %+v was not expected`, key, gotInfo) } } - } + }) + } +} - // External test package. +func TestOriginalAugmentation(t *testing.T) { + tests := []struct { + desc string + info map[string]overrideInfo + src string + want string + }{ { - // Import the real external test package, and populate its real import set. - bpkg, err := gobuild.Import(pkg, "", gobuild.ImportComment) - if err != nil { - t.Fatalf("gobuild.Import: %v", err) - } - realXTestImports := make(stringSet) - populateImportSet(bpkg.XTestImports, &realXTestImports) + desc: `do not affect function`, + info: map[string]overrideInfo{}, + src: `func Foo(a, b int) int { + return a + b + }`, + want: `func Foo(a, b int) int { + return a + b + }`, + }, { + desc: `change unnamed sync import`, + info: map[string]overrideInfo{}, + src: `import "sync" - // Add _test suffix to import path to cause parseAndAugment to use external test mode. - bpkg.ImportPath += "_test" + var _ = &sync.Mutex{}`, + want: `import sync "github.com/gopherjs/gopherjs/nosync" - // Use parseAndAugment to get a list of augmented AST files, then check only the external test files. - fset := token.NewFileSet() - files, err := parseAndAugment(NewBuildContext("", nil), bpkg, true, fset) - if err != nil { - t.Fatalf("github.com/gopherjs/gopherjs/build.parseAndAugment: %v", err) - } + var _ = &sync.Mutex{}`, + }, { + desc: `change named sync import`, + info: map[string]overrideInfo{}, + src: `import foo "sync" + + var _ = &foo.Mutex{}`, + want: `import foo "github.com/gopherjs/gopherjs/nosync" - // Verify imports of external test augmented AST files. - for _, f := range files { - fileName, pkgName := fset.File(f.Pos()).Name(), f.Name.String() - xTestFile := strings.HasSuffix(fileName, "_test.go") && strings.HasSuffix(pkgName, "_test") - if !xTestFile { - continue + var _ = &foo.Mutex{}`, + }, { + desc: `remove function`, + info: map[string]overrideInfo{ + `Foo`: {}, + }, + src: `func Foo(a, b int) int { + return a + b + }`, + want: ``, + }, { + desc: `keep original function`, + info: map[string]overrideInfo{ + `Foo`: {keepOriginal: true}, + }, + src: `func Foo(a, b int) int { + return a + b + }`, + want: `func _gopherjs_original_Foo(a, b int) int { + return a + b + }`, + }, { + desc: `remove types and values`, + info: map[string]overrideInfo{ + `Foo`: {}, + `now`: {}, + `bar1`: {}, + }, + src: `import "time" + + type Foo interface{ + bob(a, b string) string + } + + var now = time.Now + const bar1, bar2 = 21, 42`, + want: `const bar2 = 42`, + }, { + desc: `remove in multi-value context`, + info: map[string]overrideInfo{ + `bar`: {}, + }, + src: `const foo, bar = func() (int, int) { + return 24, 12 + }()`, + want: `const foo, _ = func() (int, int) { + return 24, 12 + }()`, + }, { + desc: `full remove in multi-value context`, + info: map[string]overrideInfo{ + `bar`: {}, + }, + src: `const _, bar = func() (int, int) { + return 24, 12 + }()`, + want: ``, + }, { + desc: `remove methods`, + info: map[string]overrideInfo{ + `Foo.GetBar`: {}, + `Foo.SetBar`: {}, + }, + src: ` + func (x Foo) GetBar() int { return x.bar } + func (x *Foo) SetBar(bar int) { x.bar = bar }`, + want: ``, + }, { + desc: `purge struct and methods`, + info: map[string]overrideInfo{ + `Foo`: {purgeMethods: true}, + }, + src: `type Foo struct{ + bar int } - for _, imp := range f.Imports { - importPath, err := strconv.Unquote(imp.Path.Value) - if err != nil { - t.Fatalf("strconv.Unquote(%v): %v", imp.Path.Value, err) + + func (f Foo) GetBar() int { return f.bar } + func (f *Foo) SetBar(bar int) { f.bar = bar } + + func NewFoo(bar int) *Foo { return &Foo{bar: bar} }`, + // NewFoo is not removed automatically since + // only functions with Foo as a receiver are removed. + want: `func NewFoo(bar int) *Foo { return &Foo{bar: bar} }`, + }, { + desc: `remove generics`, + info: map[string]overrideInfo{ + `Pointer`: {}, + `Sort`: {}, + `Equal`: {}, + }, + src: `import "cmp" + + // keeps the isOnlyImports from skipping what is being tested. + func foo() {} + + type Pointer[T any] struct {} + + func Sort[S ~[]E, E cmp.Ordered](x S) {} + + // overlay had stub "func Equal() {}" + func Equal[S ~[]E, E any](s1, s2 S) bool {}`, + want: `// keeps the isOnlyImports from skipping what is being tested. + func foo() {}`, + }, { + desc: `purge generics`, + info: map[string]overrideInfo{ + `Pointer`: {purgeMethods: true}, + `Sort`: {}, + `Equal`: {}, + }, + src: `import "cmp" + + // keeps the isOnlyImports from skipping what is being tested. + func foo() {} + + type Pointer[T any] struct {} + func (x *Pointer[T]) Load() *T {} + func (x *Pointer[T]) Store(val *T) {} + + func Sort[S ~[]E, E cmp.Ordered](x S) {} + + // overlay had stub "func Equal() {}" + func Equal[S ~[]E, E any](s1, s2 S) bool {}`, + want: `// keeps the isOnlyImports from skipping what is being tested. + func foo() {}`, + }, { + desc: `prune an unused import`, + info: map[string]overrideInfo{}, + src: `import foo "some/other/bar" + + // keeps the isOnlyImports from skipping what is being tested. + func foo() {}`, + want: `// keeps the isOnlyImports from skipping what is being tested. + func foo() {}`, + }, { + desc: `override signature of function`, + info: map[string]overrideInfo{ + `Foo`: { + overrideSignature: srctesting.ParseFuncDecl(t, + `package whatever + func Foo(a, b any) (any, bool) {}`), + }, + }, + src: `func Foo[T comparable](a, b T) (T, bool) { + if a == b { + return a, true } - if importPath == "github.com/gopherjs/gopherjs/js" { - continue + return b, false + }`, + want: `func Foo(a, b any) (any, bool) { + if a == b { + return a, true + } + return b, false + }`, + }, { + desc: `override signature of method`, + info: map[string]overrideInfo{ + `Foo.Bar`: { + overrideSignature: srctesting.ParseFuncDecl(t, + `package whatever + func (r *Foo) Bar(a, b any) (any, bool) {}`), + }, + }, + src: `func (r *Foo[T]) Bar(a, b T) (T, bool) { + if r.isSame(a, b) { + return a, true } - if _, ok := realXTestImports[importPath]; !ok { - t.Errorf("augmented external test package %q imports %q in file %v, but real %q doesn't:\nrealXTestImports = %v", bpkg.ImportPath, importPath, fileName, bpkg.ImportPath, realXTestImports) + return b, false + }`, + want: `func (r *Foo) Bar(a, b any) (any, bool) { + if r.isSame(a, b) { + return a, true } - } - } - } + return b, false + }`, + }, { + desc: `empty file removes all imports`, + info: map[string]overrideInfo{ + `foo`: {}, + }, + src: `import . "math/rand" + func foo() int { + return Int() + }`, + want: ``, + }, { + desc: `empty file with directive`, + info: map[string]overrideInfo{ + `foo`: {}, + }, + src: `//go:linkname foo bar + import _ "unsafe"`, + want: `//go:linkname foo bar + import _ "unsafe"`, + }, { + desc: `multiple imports for directives`, + info: map[string]overrideInfo{ + `A`: {}, + `C`: {}, + }, + src: `import "unsafe" + import "embed" + + //go:embed hello.txt + var A embed.FS + + //go:embed goodbye.txt + var B string + + var C unsafe.Pointer + + // override Now with hardcoded time for testing + //go:linkname timeNow time.Now + func timeNow() time.Time { + return time.Date(2012, 8, 6, 0, 0, 0, 0, time.UTC) + }`, + want: `import _ "unsafe" + import _ "embed" + + //go:embed goodbye.txt + var B string + + // override Now with hardcoded time for testing + //go:linkname timeNow time.Now + func timeNow() time.Time { + return time.Date(2012, 8, 6, 0, 0, 0, 0, time.UTC) + }`, + }, } -} -// stringSet is used to print a set of strings in a more readable way. -type stringSet map[string]struct{} + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + pkgName := "package testpackage\n\n" + importPath := `math/rand` + f := srctesting.New(t) + fileSrc := f.Parse("test.go", pkgName+test.src) -func (m stringSet) String() string { - s := make([]string, 0, len(m)) - for v := range m { - s = append(s, v) + augmentOriginalImports(importPath, fileSrc) + augmentOriginalFile(fileSrc, test.info) + pruneImports(fileSrc) + + got := srctesting.Format(t, f.FileSet, fileSrc) + + fileWant := f.Parse("test.go", pkgName+test.want) + want := srctesting.Format(t, f.FileSet, fileWant) + + if got != want { + t.Errorf("augmentOriginalImports, augmentOriginalFile, and pruneImports got unexpected code:\n"+ + "returned:\n\t%q\nwant:\n\t%q", got, want) + } + }) } - return fmt.Sprintf("%q", s) } diff --git a/build/cache/cache.go b/build/cache/cache.go new file mode 100644 index 000000000..fc0949d67 --- /dev/null +++ b/build/cache/cache.go @@ -0,0 +1,173 @@ +// Package cache solves one of the hardest computer science problems in +// application to GopherJS compiler outputs. +package cache + +import ( + "crypto/sha256" + "fmt" + "go/build" + "go/types" + "os" + "path" + "path/filepath" + "time" + + "github.com/gopherjs/gopherjs/compiler" + log "github.com/sirupsen/logrus" +) + +// cacheRoot is the base path for GopherJS's own build cache. +// +// It serves a similar function to the Go build cache, but is a lot more +// simplistic and therefore not compatible with Go. We use this cache directory +// to store build artifacts for packages loaded from a module, for which PkgObj +// provided by go/build points inside the module source tree, which can cause +// inconvenience with version control, etc. +var cacheRoot = func() string { + path, err := os.UserCacheDir() + if err == nil { + return filepath.Join(path, "gopherjs", "build_cache") + } + + return filepath.Join(build.Default.GOPATH, "pkg", "gopherjs_build_cache") +}() + +// cachedPath returns a location inside the build cache for a given set of key +// strings. The set of keys must uniquely identify cacheable object. Prefer +// using more specific functions to ensure key consistency. +func cachedPath(keys ...string) string { + key := path.Join(keys...) + if key == "" { + panic("CachedPath() must not be used with an empty string") + } + sum := fmt.Sprintf("%x", sha256.Sum256([]byte(key))) + return filepath.Join(cacheRoot, sum[0:2], sum) +} + +// Clear the cache. This will remove *all* cached artifacts from *all* build +// configurations. +func Clear() error { + return os.RemoveAll(cacheRoot) +} + +// BuildCache manages build artifacts that are cached for incremental builds. +// +// Cache is designed to be non-durable: any store and load errors are swallowed +// and simply lead to a cache miss. The caller must be able to handle cache +// misses. Nil pointer to BuildCache is valid and simply disables caching. +// +// BuildCache struct fields represent build parameters which change invalidates +// the cache. For example, any artifacts that were cached for a minified build +// must not be reused for a non-minified build. GopherJS version change also +// invalidates the cache. It is callers responsibility to ensure that artifacts +// passed the StoreArchive function were generated with the same build +// parameters as the cache is configured. +// +// There is no upper limit for the total cache size. It can be cleared +// programmatically via the Clear() function, or the user can just delete the +// directory if it grows too big. +// +// TODO(nevkontakte): changes in the input sources or dependencies doesn't +// currently invalidate the cache. This is handled at the higher level by +// checking cached archive timestamp against loaded package modification time. +// +// TODO(nevkontakte): this cache could benefit from checksum integrity checks. +type BuildCache struct { + GOOS string + GOARCH string + GOROOT string + GOPATH string + BuildTags []string + Minify bool + // When building for tests, import path of the package being tested. The + // package under test is built with *_test.go sources included, and since it + // may be imported by other packages in the binary we can't reuse the "normal" + // cache. + TestedPackage string +} + +func (bc BuildCache) String() string { + return fmt.Sprintf("%#v", bc) +} + +// StoreArchive compiled archive in the cache. Any error inside this method +// will cause the cache not to be persisted. +// +// The passed in buildTime is used to determine if the archive is out-of-date when reloaded. +// Typically it should be set to the srcModTime or time.Now(). +func (bc *BuildCache) StoreArchive(a *compiler.Archive, buildTime time.Time) { + if bc == nil { + return // Caching is disabled. + } + path := cachedPath(bc.archiveKey(a.ImportPath)) + if err := os.MkdirAll(filepath.Dir(path), 0o750); err != nil { + log.Warningf("Failed to create build cache directory: %v", err) + return + } + // Write the archive in a temporary file first to avoid concurrency errors. + f, err := os.CreateTemp(filepath.Dir(path), filepath.Base(path)) + if err != nil { + log.Warningf("Failed to temporary build cache file: %v", err) + return + } + defer f.Close() + if err := compiler.WriteArchive(a, buildTime, f); err != nil { + log.Warningf("Failed to write build cache archive %q: %v", a, err) + // Make sure we don't leave a half-written archive behind. + os.Remove(f.Name()) + return + } + f.Close() + // Rename fully written file into its permanent name. + if err := os.Rename(f.Name(), path); err != nil { + log.Warningf("Failed to rename build cache archive to %q: %v", path, err) + } + log.Infof("Successfully stored build archive %q as %q.", a, path) +} + +// LoadArchive returns a previously cached archive of the given package or nil +// if it wasn't previously stored. +// +// The returned archive would have been built with the same configuration as +// the build cache was. +// +// The imports map is used to resolve package dependencies and may modify the +// map to include the package from the read archive. See [gcexportdata.Read]. +func (bc *BuildCache) LoadArchive(importPath string, srcModTime time.Time, imports map[string]*types.Package) *compiler.Archive { + if bc == nil { + return nil // Caching is disabled. + } + path := cachedPath(bc.archiveKey(importPath)) + f, err := os.Open(path) + if err != nil { + if os.IsNotExist(err) { + log.Infof("No cached package archive for %q.", importPath) + } else { + log.Warningf("Failed to open cached package archive for %q: %v", importPath, err) + } + return nil // Cache miss. + } + defer f.Close() + a, buildTime, err := compiler.ReadArchive(importPath, f, srcModTime, imports) + if err != nil { + log.Warningf("Failed to read cached package archive for %q: %v", importPath, err) + return nil // Invalid/corrupted archive, cache miss. + } + if a == nil { + log.Infof("Found out-of-date package archive for %q, built at %v.", importPath, buildTime) + return nil // Archive is out-of-date, cache miss. + } + log.Infof("Found cached package archive for %q, built at %v.", importPath, buildTime) + return a +} + +// commonKey returns a part of the cache key common for all artifacts generated +// under a given BuildCache configuration. +func (bc *BuildCache) commonKey() string { + return fmt.Sprintf("%#v + %v", *bc, compiler.Version) +} + +// archiveKey returns a full cache key for a package's compiled archive. +func (bc *BuildCache) archiveKey(importPath string) string { + return path.Join("archive", bc.commonKey(), importPath) +} diff --git a/build/cache/cache_test.go b/build/cache/cache_test.go new file mode 100644 index 000000000..0a0541f64 --- /dev/null +++ b/build/cache/cache_test.go @@ -0,0 +1,117 @@ +package cache + +import ( + "go/types" + "testing" + "time" + + "github.com/google/go-cmp/cmp" + "github.com/gopherjs/gopherjs/compiler" +) + +func TestStore(t *testing.T) { + cacheForTest(t) + + want := &compiler.Archive{ + ImportPath: "fake/package", + Imports: []string{"fake/dep"}, + } + + srcModTime := newTime(0.0) + buildTime := newTime(5.0) + imports := map[string]*types.Package{} + bc := BuildCache{} + if got := bc.LoadArchive(want.ImportPath, srcModTime, imports); got != nil { + t.Errorf("Got: %s was found in the cache. Want: empty cache.", got.ImportPath) + } + bc.StoreArchive(want, buildTime) + got := bc.LoadArchive(want.ImportPath, srcModTime, imports) + if got == nil { + t.Errorf("Got: %s was not found in the cache. Want: archive is can be loaded after store.", want.ImportPath) + } + if diff := cmp.Diff(want, got); diff != "" { + t.Errorf("Loaded archive is different from stored (-want,+got):\n%s", diff) + } + + // Make sure the package names are a part of the cache key. + if got := bc.LoadArchive("fake/other", srcModTime, imports); got != nil { + t.Errorf("Got: fake/other was found in cache: %#v. Want: nil for packages that weren't cached.", got) + } +} + +func TestInvalidation(t *testing.T) { + cacheForTest(t) + + tests := []struct { + cache1 BuildCache + cache2 BuildCache + }{ + { + cache1: BuildCache{Minify: true}, + cache2: BuildCache{Minify: false}, + }, { + cache1: BuildCache{GOOS: "dos"}, + cache2: BuildCache{GOOS: "amiga"}, + }, { + cache1: BuildCache{GOARCH: "m68k"}, + cache2: BuildCache{GOARCH: "mos6502"}, + }, { + cache1: BuildCache{GOROOT: "here"}, + cache2: BuildCache{GOROOT: "there"}, + }, { + cache1: BuildCache{GOPATH: "home"}, + cache2: BuildCache{GOPATH: "away"}, + }, + } + + srcModTime := newTime(0.0) + buildTime := newTime(5.0) + imports := map[string]*types.Package{} + for _, test := range tests { + a := &compiler.Archive{ImportPath: "package/fake"} + test.cache1.StoreArchive(a, buildTime) + + if got := test.cache2.LoadArchive(a.ImportPath, srcModTime, imports); got != nil { + t.Logf("-cache1,+cache2:\n%s", cmp.Diff(test.cache1, test.cache2)) + t.Errorf("Got: %v loaded from cache. Want: build parameter change invalidates cache.", got) + } + } +} + +func TestOldArchive(t *testing.T) { + cacheForTest(t) + + want := &compiler.Archive{ + ImportPath: "fake/package", + Imports: []string{"fake/dep"}, + } + + buildTime := newTime(5.0) + imports := map[string]*types.Package{} + bc := BuildCache{} + bc.StoreArchive(want, buildTime) + + oldSrcModTime := newTime(2.0) // older than archive build time, so archive is up-to-date + got := bc.LoadArchive(want.ImportPath, oldSrcModTime, imports) + if got == nil { + t.Errorf("Got: %s was nil. Want: up-to-date archive to be loaded.", want.ImportPath) + } + + newerSrcModTime := newTime(7.0) // newer than archive build time, so archive is stale + got = bc.LoadArchive(want.ImportPath, newerSrcModTime, imports) + if got != nil { + t.Errorf("Got: %s was not nil. Want: stale archive to not be loaded.", want.ImportPath) + } +} + +func cacheForTest(t *testing.T) { + t.Helper() + originalRoot := cacheRoot + t.Cleanup(func() { cacheRoot = originalRoot }) + cacheRoot = t.TempDir() +} + +func newTime(seconds float64) time.Time { + return time.Date(1969, 7, 20, 20, 17, 0, 0, time.UTC). + Add(time.Duration(seconds * float64(time.Second))) +} diff --git a/build/context.go b/build/context.go new file mode 100644 index 000000000..657300839 --- /dev/null +++ b/build/context.go @@ -0,0 +1,442 @@ +package build + +import ( + "fmt" + "go/build" + "go/token" + "net/http" + "os" + "os/exec" + "path" + "path/filepath" + "sort" + "strings" + + _ "github.com/gopherjs/gopherjs/build/versionhack" // go/build release tags hack. + "github.com/gopherjs/gopherjs/compiler" + "github.com/gopherjs/gopherjs/compiler/gopherjspkg" + "github.com/gopherjs/gopherjs/compiler/jsFile" + "github.com/gopherjs/gopherjs/compiler/natives" + "golang.org/x/tools/go/buildutil" +) + +// Env contains build environment configuration required to define an instance +// of XContext. +type Env struct { + GOROOT string + GOPATH string + + GOOS string + GOARCH string + + BuildTags []string + InstallSuffix string +} + +// DefaultEnv creates a new instance of build Env according to environment +// variables. +// +// By default, GopherJS will use GOOS=js GOARCH=ecmascript to build non-standard +// library packages. If GOOS or GOARCH environment variables are set and not +// empty, user-provided values will be used instead. This is done to facilitate +// transition from the legacy GopherJS behavior, which used native GOOS, and may +// be removed in future. +func DefaultEnv() Env { + e := Env{} + e.GOROOT = DefaultGOROOT + e.GOPATH = build.Default.GOPATH + + if val := os.Getenv("GOOS"); val != "" { + e.GOOS = val + } else { + e.GOOS = "js" + } + + if val := os.Getenv("GOARCH"); val != "" { + e.GOARCH = val + } else { + e.GOARCH = "ecmascript" + } + return e +} + +// XContext is an extension of go/build.Context with GopherJS-specific features. +// +// It abstracts away several different sources GopherJS can load its packages +// from, with a minimal API. +type XContext interface { + // Import returns details about the Go package named by the importPath, + // interpreting local import paths relative to the srcDir directory. + Import(path string, srcDir string, mode build.ImportMode) (*PackageData, error) + + // Env returns build environment configuration this context has been set up for. + Env() Env + + // Match explans build patterns into a set of matching import paths (see go help packages). + Match(patterns []string) ([]string, error) +} + +// simpleCtx is a wrapper around go/build.Context with support for GopherJS-specific +// features. +type simpleCtx struct { + bctx build.Context + isVirtual bool // Imported packages don't have a physical directory on disk. + noPostTweaks bool // Don't apply post-load tweaks to packages. For tests only. +} + +// Import implements XContext.Import(). +func (sc simpleCtx) Import(importPath string, srcDir string, mode build.ImportMode) (*PackageData, error) { + bctx, mode := sc.applyPreloadTweaks(importPath, srcDir, mode) + pkg, err := bctx.Import(importPath, srcDir, mode) + if err != nil { + return nil, err + } + jsFiles, err := jsFile.JSFilesFromDir(&sc.bctx, pkg.Dir) + if err != nil { + return nil, fmt.Errorf("failed to enumerate .inc.js files in %s: %w", pkg.Dir, err) + } + if !path.IsAbs(pkg.Dir) { + pkg.Dir = mustAbs(pkg.Dir) + } + pkg = sc.applyPostloadTweaks(pkg) + + return &PackageData{ + Package: pkg, + IsVirtual: sc.isVirtual, + JSFiles: jsFiles, + bctx: &sc.bctx, + }, nil +} + +// Match implements XContext.Match. +func (sc simpleCtx) Match(patterns []string) ([]string, error) { + if sc.isVirtual { + // We can't use go tool to enumerate packages in a virtual file system, + // so we fall back onto a simpler implementation provided by the buildutil + // package. It doesn't support all valid patterns, but should be good enough. + // + // Note: this code path will become unnecessary after + // https://github.com/gopherjs/gopherjs/issues/1021 is implemented. + args := []string{} + for _, p := range patterns { + switch p { + case "all": + args = append(args, "...") + case "std", "main", "cmd": + // These patterns are not supported by buildutil.ExpandPatterns(), + // but they would be matched by the real context correctly, so skip them. + default: + args = append(args, p) + } + } + matches := []string{} + for importPath := range buildutil.ExpandPatterns(&sc.bctx, args) { + if importPath[0] == '.' { + p, err := sc.Import(importPath, ".", build.FindOnly) + // Resolve relative patterns into canonical import paths. + if err != nil { + continue + } + importPath = p.ImportPath + } + matches = append(matches, importPath) + } + sort.Strings(matches) + return matches, nil + } + + args := append([]string{ + "-e", "-compiler=gc", + "-tags=" + strings.Join(sc.bctx.BuildTags, ","), + "-installsuffix=" + sc.bctx.InstallSuffix, + "-f={{.ImportPath}}", + "--", + }, patterns...) + + out, err := sc.gotool("list", args...) + if err != nil { + return nil, fmt.Errorf("failed to list packages on FS: %w", err) + } + matches := strings.Split(strings.TrimSpace(out), "\n") + sort.Strings(matches) + return matches, nil +} + +func (sc simpleCtx) Env() Env { + return Env{ + GOROOT: sc.bctx.GOROOT, + GOPATH: sc.bctx.GOPATH, + GOOS: sc.bctx.GOOS, + GOARCH: sc.bctx.GOARCH, + BuildTags: sc.bctx.BuildTags, + InstallSuffix: sc.bctx.InstallSuffix, + } +} + +// gotool executes the go tool set up for the build context and returns standard output. +func (sc simpleCtx) gotool(subcommand string, args ...string) (string, error) { + if sc.isVirtual { + panic(fmt.Errorf("can't use go tool with a virtual build context")) + } + args = append([]string{subcommand}, args...) + cmd := exec.Command(filepath.Join(sc.bctx.GOROOT, "bin", "go"), args...) + + if sc.bctx.Dir != "" { + cmd.Dir = sc.bctx.Dir + } + + var stdout, stderr strings.Builder + cmd.Stdout = &stdout + cmd.Stderr = &stderr + + cgo := "0" + if sc.bctx.CgoEnabled { + cgo = "1" + } + cmd.Env = append(os.Environ(), + "GOOS="+sc.bctx.GOOS, + "GOARCH="+sc.bctx.GOARCH, + "GOROOT="+sc.bctx.GOROOT, + "GOPATH="+sc.bctx.GOPATH, + "CGO_ENABLED="+cgo, + ) + + if err := cmd.Run(); err != nil { + return "", fmt.Errorf("go tool error: %v: %w\n%s", cmd, err, stderr.String()) + } + return stdout.String(), nil +} + +// applyPreloadTweaks makes several package-specific adjustments to package importing. +// +// Ideally this method would not be necessary, but currently several packages +// require special handing in order to be compatible with GopherJS. This method +// returns a copy of the build context, keeping the original one intact. +func (sc simpleCtx) applyPreloadTweaks(importPath string, srcDir string, mode build.ImportMode) (build.Context, build.ImportMode) { + bctx := sc.bctx + if sc.isStd(importPath, srcDir) { + // For most of the platform-dependent code in the standard library we simply + // reuse implementations targeting WebAssembly. For the user-supplied we use + // regular gopherjs-specific GOOS/GOARCH. + bctx.GOOS = "js" + bctx.GOARCH = "wasm" + } + switch importPath { + case "github.com/gopherjs/gopherjs/js", "github.com/gopherjs/gopherjs/nosync": + // These packages are already embedded via gopherjspkg.FS virtual filesystem + // (which can be safely vendored). Don't try to use vendor directory to + // resolve them. + mode |= build.IgnoreVendor + } + + return bctx, mode +} + +// applyPostloadTweaks makes adjustments to the contents of the loaded package. +// +// Some of the standard library packages require additional tweaks that are not +// covered by our augmentation logic, for example excluding or including +// particular source files. This method ensures that all such tweaks are applied +// before the package is returned to the caller. +func (sc simpleCtx) applyPostloadTweaks(pkg *build.Package) *build.Package { + if sc.isVirtual { + // GopherJS overlay package sources don't need tweaks to their content, + // since we already control them directly. + return pkg + } + if sc.noPostTweaks { + return pkg + } + switch pkg.ImportPath { + case "runtime": + pkg.GoFiles = []string{} // Package sources are completely replaced in natives. + case "runtime/pprof": + pkg.GoFiles = nil + case "sync": + // GopherJS completely replaces sync.Pool implementation with a simpler one, + // since it always executes in a single-threaded environment. + pkg.GoFiles = exclude(pkg.GoFiles, "pool.go") + case "syscall/js": + // Reuse upstream tests to ensure conformance, but completely replace + // implementation. + pkg.GoFiles = []string{} + pkg.TestGoFiles = []string{} + } + + pkg.Imports, pkg.ImportPos = updateImports(pkg.GoFiles, pkg.ImportPos) + pkg.TestImports, pkg.TestImportPos = updateImports(pkg.TestGoFiles, pkg.TestImportPos) + pkg.XTestImports, pkg.XTestImportPos = updateImports(pkg.XTestGoFiles, pkg.XTestImportPos) + + return pkg +} + +// isStd returns true if the given importPath resolves into a standard library +// package. Relative paths are interpreted relative to srcDir. +func (sc simpleCtx) isStd(importPath, srcDir string) bool { + pkg, err := sc.bctx.Import(importPath, srcDir, build.FindOnly) + if err != nil { + return false + } + return pkg.Goroot +} + +var defaultBuildTags = []string{ + "netgo", // See https://godoc.org/net#hdr-Name_Resolution. + "purego", // See https://golang.org/issues/23172. + "math_big_pure_go", // Use pure Go version of math/big. + // We can't set compiler to gopherjs, since Go tooling doesn't support that, + // but, we can at least always set this build tag. + "gopherjs", +} + +// embeddedCtx creates simpleCtx that imports from a virtual FS embedded into +// the GopherJS compiler. +func embeddedCtx(embedded http.FileSystem, e Env) *simpleCtx { + fs := &vfs{embedded} + ec := goCtx(e) + ec.bctx.GOPATH = "" + + // Path functions must behave unix-like to work with the VFS. + ec.bctx.JoinPath = path.Join + ec.bctx.SplitPathList = splitPathList + ec.bctx.IsAbsPath = path.IsAbs + ec.bctx.HasSubdir = hasSubdir + + // Substitute real FS with the embedded one. + ec.bctx.IsDir = fs.IsDir + ec.bctx.ReadDir = fs.ReadDir + ec.bctx.OpenFile = fs.OpenFile + ec.isVirtual = true + return ec +} + +// overlayCtx creates simpleCtx that imports from the embedded standard library +// overlays. +func overlayCtx(e Env) *simpleCtx { + return embeddedCtx(&withPrefix{fs: http.FS(natives.FS), prefix: e.GOROOT}, e) +} + +// gopherjsCtx creates a simpleCtx that imports from the embedded gopherjs +// packages in case they are not present in the user's source tree. +func gopherjsCtx(e Env) *simpleCtx { + gopherjsRoot := filepath.Join(e.GOROOT, "src", "github.com", "gopherjs", "gopherjs") + return embeddedCtx(&withPrefix{gopherjspkg.FS, gopherjsRoot}, e) +} + +// goCtx creates simpleCtx that imports from the real file system GOROOT, GOPATH +// or Go Modules. +func goCtx(e Env) *simpleCtx { + gc := simpleCtx{ + bctx: build.Context{ + GOROOT: e.GOROOT, + GOPATH: e.GOPATH, + GOOS: e.GOOS, + GOARCH: e.GOARCH, + InstallSuffix: e.InstallSuffix, + Compiler: "gc", + BuildTags: append(append([]string{}, e.BuildTags...), defaultBuildTags...), + CgoEnabled: false, // CGo is not supported by GopherJS. + + // go/build supports modules, but only when no FS access functions are + // overridden and when provided ReleaseTags match those of the default + // context (matching Go compiler's version). + // This limitation stems from the fact that it will invoke the Go tool + // which can only see files on the real FS and will assume release tags + // based on the Go tool's version. + // + // See also comments to the versionhack package. + ReleaseTags: build.Default.ReleaseTags[:compiler.GoVersion], + }, + } + return &gc +} + +// chainedCtx combines two build contexts. Secondary context acts as a fallback +// when a package is not found in the primary, and is ignored otherwise. +// +// This allows GopherJS to load its core "js" and "nosync" packages from the +// embedded VFS whenever user's code doesn't directly depend on them, but +// augmented stdlib does. +type chainedCtx struct { + primary XContext + secondary XContext +} + +// Import implements buildCtx.Import(). +func (cc chainedCtx) Import(importPath string, srcDir string, mode build.ImportMode) (*PackageData, error) { + pkg, err := cc.primary.Import(importPath, srcDir, mode) + if err == nil { + return pkg, nil + } else if IsPkgNotFound(err) { + return cc.secondary.Import(importPath, srcDir, mode) + } else { + return nil, err + } +} + +func (cc chainedCtx) Env() Env { return cc.primary.Env() } + +// Match implements XContext.Match(). +// +// Packages from both contexts are included and returned as a deduplicated +// sorted list. +func (cc chainedCtx) Match(patterns []string) ([]string, error) { + m1, err := cc.primary.Match(patterns) + if err != nil { + return nil, fmt.Errorf("failed to list packages in the primary context: %s", err) + } + m2, err := cc.secondary.Match(patterns) + if err != nil { + return nil, fmt.Errorf("failed to list packages in the secondary context: %s", err) + } + + seen := map[string]bool{} + matches := []string{} + for _, m := range append(m1, m2...) { + if seen[m] { + continue + } + seen[m] = true + matches = append(matches, m) + } + sort.Strings(matches) + return matches, nil +} + +// IsPkgNotFound returns true if the error was caused by package not found. +// +// Unfortunately, go/build doesn't make use of typed errors, so we have to +// rely on the error message. +func IsPkgNotFound(err error) bool { + return err != nil && + (strings.Contains(err.Error(), "cannot find package") || // Modules off. + strings.Contains(err.Error(), "is not in GOROOT")) // Modules on. +} + +// updateImports package's list of import paths to only those present in sources +// after post-load tweaks. +func updateImports(sources []string, importPos map[string][]token.Position) (newImports []string, newImportPos map[string][]token.Position) { + if importPos == nil { + // Short-circuit for tests when no imports are loaded. + return nil, nil + } + sourceSet := map[string]bool{} + for _, source := range sources { + sourceSet[source] = true + } + + newImportPos = map[string][]token.Position{} + for importPath, positions := range importPos { + for _, pos := range positions { + if sourceSet[filepath.Base(pos.Filename)] { + newImportPos[importPath] = append(newImportPos[importPath], pos) + } + } + } + + for importPath := range newImportPos { + newImports = append(newImports, importPath) + } + sort.Strings(newImports) + return newImports, newImportPos +} diff --git a/build/context_test.go b/build/context_test.go new file mode 100644 index 000000000..5b377f6b7 --- /dev/null +++ b/build/context_test.go @@ -0,0 +1,214 @@ +package build + +import ( + "fmt" + "go/build" + "net/http" + "path/filepath" + "strings" + "testing" + + "github.com/google/go-cmp/cmp" + "github.com/google/go-cmp/cmp/cmpopts" + "github.com/gopherjs/gopherjs/compiler/gopherjspkg" + "golang.org/x/tools/go/buildutil" +) + +func init() { + gopherjspkg.RegisterFS(http.Dir("..")) +} + +func TestSimpleCtx(t *testing.T) { + e := DefaultEnv() + + gopherjsRoot := filepath.Join(e.GOROOT, "src", "github.com", "gopherjs", "gopherjs") + fs := &withPrefix{gopherjspkg.FS, gopherjsRoot} + ec := embeddedCtx(fs, e) + ec.bctx.JoinPath = filepath.Join // Avoid diffs in the test on Windows. + + gc := goCtx(e) + + t.Run("exists", func(t *testing.T) { + tests := []struct { + buildCtx XContext + wantPkg *PackageData + }{ + { + buildCtx: ec, + wantPkg: &PackageData{ + Package: expectedPackage(&ec.bctx, "github.com/gopherjs/gopherjs/js", "wasm"), + IsVirtual: true, + }, + }, { + buildCtx: gc, + wantPkg: &PackageData{ + Package: expectedPackage(&gc.bctx, "fmt", "wasm"), + IsVirtual: false, + }, + }, + } + + for _, test := range tests { + t.Run(fmt.Sprintf("%T", test.buildCtx), func(t *testing.T) { + importPath := test.wantPkg.ImportPath + got, err := test.buildCtx.Import(importPath, "", build.FindOnly) + if err != nil { + t.Fatalf("ec.Import(%q) returned error: %s. Want: no error.", importPath, err) + } + if diff := cmp.Diff(test.wantPkg, got, cmpopts.IgnoreUnexported(*got)); diff != "" { + t.Errorf("ec.Import(%q) returned diff (-want,+got):\n%s", importPath, diff) + } + }) + } + }) + + t.Run("not found", func(t *testing.T) { + tests := []struct { + buildCtx XContext + importPath string + }{ + { + buildCtx: ec, + importPath: "package/not/found", + }, { + // Outside of the main module. + buildCtx: gc, + importPath: "package/not/found", + }, { + // In the main module. + buildCtx: gc, + importPath: "github.com/gopherjs/gopherjs/not/found", + }, + } + + for _, test := range tests { + t.Run(fmt.Sprintf("%T", test.buildCtx), func(t *testing.T) { + _, err := ec.Import(test.importPath, "", build.FindOnly) + want := "cannot find package" + if err == nil || !strings.Contains(err.Error(), want) { + t.Errorf("ec.Import(%q) returned error: %s. Want error containing %q.", test.importPath, err, want) + } + }) + } + }) +} + +func TestChainedCtx(t *testing.T) { + // Construct a chained context of two fake contexts so that we could verify + // fallback behavior. + cc := chainedCtx{ + primary: simpleCtx{ + bctx: *buildutil.FakeContext(map[string]map[string]string{ + "primaryonly": {"po.go": "package primaryonly"}, + "both": {"both.go": "package both"}, + }), + isVirtual: false, + }, + secondary: simpleCtx{ + bctx: *buildutil.FakeContext(map[string]map[string]string{ + "both": {"both_secondary.go": "package both"}, + "secondaryonly": {"so.go": "package secondaryonly"}, + }), + isVirtual: true, + }, + } + + tests := []struct { + importPath string + wantFromPrimary bool + }{ + { + importPath: "primaryonly", + wantFromPrimary: true, + }, { + importPath: "both", + wantFromPrimary: true, + }, { + importPath: "secondaryonly", + wantFromPrimary: false, + }, + } + + for _, test := range tests { + t.Run(test.importPath, func(t *testing.T) { + pkg, err := cc.Import(test.importPath, "", 0) + if err != nil { + t.Errorf("cc.Import() returned error: %v. Want: no error.", err) + } + gotFromPrimary := !pkg.IsVirtual + if gotFromPrimary != test.wantFromPrimary { + t.Errorf("Got package imported from primary: %t. Want: %t.", gotFromPrimary, test.wantFromPrimary) + } + }) + } +} + +func TestIsStd(t *testing.T) { + realGOROOT := goCtx(DefaultEnv()) + overlayGOROOT := overlayCtx(DefaultEnv()) + gopherjsPackages := gopherjsCtx(DefaultEnv()) + tests := []struct { + descr string + importPath string + context *simpleCtx + want bool + }{ + { + descr: "real goroot, standard package", + importPath: "fmt", + context: realGOROOT, + want: true, + }, + { + descr: "real goroot, non-standard package", + importPath: "github.com/gopherjs/gopherjs/build", + context: realGOROOT, + want: false, + }, + { + descr: "real goroot, non-exiting package", + importPath: "does/not/exist", + context: realGOROOT, + want: false, + }, + { + descr: "overlay goroot, standard package", + importPath: "fmt", + context: overlayGOROOT, + want: true, + }, + { + descr: "embedded gopherjs packages, gopherjs/js package", + importPath: "github.com/gopherjs/gopherjs/js", + context: gopherjsPackages, + // When user's source tree doesn't contain gopherjs package (e.g. it uses + // syscall/js API only), we pretend that gopherjs/js package is included + // in the standard library. + want: true, + }, + } + + for _, test := range tests { + t.Run(test.descr, func(t *testing.T) { + got := test.context.isStd(test.importPath, "") + if got != test.want { + t.Errorf("Got: simpleCtx.isStd(%q) = %v. Want: %v", test.importPath, got, test.want) + } + }) + } +} + +func expectedPackage(bctx *build.Context, importPath string, goarch string) *build.Package { + targetRoot := filepath.Clean(filepath.Join(bctx.GOROOT, "pkg", bctx.GOOS+"_"+goarch)) + return &build.Package{ + Dir: filepath.Join(bctx.GOROOT, "src", importPath), + ImportPath: importPath, + Root: bctx.GOROOT, + SrcRoot: filepath.Join(bctx.GOROOT, "src"), + PkgRoot: filepath.Join(bctx.GOROOT, "pkg"), + PkgTargetRoot: targetRoot, + BinDir: filepath.Join(bctx.GOROOT, "bin"), + Goroot: true, + PkgObj: filepath.Join(targetRoot, importPath+".a"), + } +} diff --git a/build/embed.go b/build/embed.go new file mode 100644 index 000000000..a68fb9494 --- /dev/null +++ b/build/embed.go @@ -0,0 +1,179 @@ +package build + +import ( + "bytes" + "fmt" + "go/ast" + "go/parser" + "go/token" + "strconv" + + "github.com/msvitok77/goembed" +) + +func buildIdent(name string) string { + return fmt.Sprintf("__gopherjs_embed_%x__", name) +} + +var embed_head = `package %v + +import ( + "embed" + _ "unsafe" +) + +//go:linkname __gopherjs_embed_buildFS__ embed.buildFS +func __gopherjs_embed_buildFS__(list []struct { + name string + data string + hash [16]byte +}) (f embed.FS) +` + +// embedFiles generates an additional source file, which initializes all variables in the package with a go:embed directive. +func embedFiles(pkg *PackageData, fset *token.FileSet, files []*ast.File) (*ast.File, error) { + if len(pkg.EmbedPatternPos) == 0 { + return nil, nil + } + + ems, err := goembed.CheckEmbed(pkg.EmbedPatternPos, fset, files) + if err != nil { + return nil, err + } + + r := goembed.NewResolve() + for _, em := range ems { + fs, err := r.Load(pkg.Dir, fset, em) + if err != nil { + return nil, err + } + switch em.Kind { + case goembed.EmbedMaybeAlias: + // value = Type(data) + // valid alias string or []byte type used by types.check + em.Spec.Values = []ast.Expr{ + &ast.CallExpr{ + Fun: em.Spec.Type, + Args: []ast.Expr{ + &ast.Ident{ + Name: buildIdent(fs[0].Name), + NamePos: em.Spec.Names[0].NamePos, + }, + }, + }, + } + case goembed.EmbedBytes: + // value = []byte(data) + em.Spec.Values = []ast.Expr{ + &ast.CallExpr{ + Fun: em.Spec.Type, + Args: []ast.Expr{ast.NewIdent(buildIdent(fs[0].Name))}, + }, + } + case goembed.EmbedString: + // value = data + em.Spec.Values = []ast.Expr{ast.NewIdent(buildIdent(fs[0].Name))} + case goembed.EmbedFiles: + // value = __gopherjs_embed_buildFS__([]struct{name string; data string; hash [16]byte}{...}) + fs = goembed.BuildFS(fs) + elts := make([]ast.Expr, len(fs)) + for i, f := range fs { + if len(f.Data) == 0 { + elts[i] = &ast.CompositeLit{ + Elts: []ast.Expr{ + &ast.BasicLit{Kind: token.STRING, Value: strconv.Quote(f.Name)}, + &ast.BasicLit{Kind: token.STRING, Value: `""`}, + &ast.CompositeLit{ + Type: &ast.ArrayType{ + Len: &ast.BasicLit{Kind: token.INT, Value: "16"}, + Elt: ast.NewIdent("byte"), + }, + }, + }, + } + } else { + var hash [16]ast.Expr + for j, v := range f.Hash { + hash[j] = &ast.BasicLit{Kind: token.INT, Value: strconv.Itoa(int(v))} + } + elts[i] = &ast.CompositeLit{ + Elts: []ast.Expr{ + &ast.BasicLit{Kind: token.STRING, Value: strconv.Quote(f.Name)}, + ast.NewIdent(buildIdent(f.Name)), + &ast.CompositeLit{ + Type: &ast.ArrayType{ + Len: &ast.BasicLit{Kind: token.INT, Value: "16"}, + Elt: ast.NewIdent("byte"), + }, + Elts: hash[:], + }, + }, + } + } + } + call := &ast.CallExpr{ + Fun: ast.NewIdent("__gopherjs_embed_buildFS__"), + Args: []ast.Expr{ + &ast.CompositeLit{ + Type: &ast.ArrayType{ + Elt: &ast.StructType{ + Fields: &ast.FieldList{ + List: []*ast.Field{ + { + Names: []*ast.Ident{ast.NewIdent("name")}, + Type: ast.NewIdent("string"), + }, + { + Names: []*ast.Ident{ast.NewIdent("data")}, + Type: ast.NewIdent("string"), + }, + { + Names: []*ast.Ident{ast.NewIdent("hash")}, + Type: &ast.ArrayType{ + Len: &ast.BasicLit{Kind: token.INT, Value: "16"}, + Elt: ast.NewIdent("byte"), + }, + }, + }, + }, + }, + }, + Elts: elts, + }, + }, + } + em.Spec.Values = []ast.Expr{call} + } + } + + var buf bytes.Buffer + fmt.Fprintf(&buf, embed_head, pkg.Name) + buf.WriteString("\nconst (\n") + for _, f := range r.Files() { + if len(f.Data) == 0 { + fmt.Fprintf(&buf, "\t%v = \"\"\n", buildIdent(f.Name)) + } else { + fmt.Fprintf(&buf, "\t%v = \"%v\"\n", buildIdent(f.Name), goembed.BytesToHex(f.Data)) + } + } + buf.WriteString(")\n\n") + f, err := parser.ParseFile(fset, "js_embed.go", buf.String(), parser.ParseComments) + if err != nil { + return nil, err + } + return f, nil +} + +func joinEmbedPatternPos(m1, m2 map[string][]token.Position) map[string][]token.Position { + if len(m1) == 0 && len(m2) == 0 { + return nil + } + m := make(map[string][]token.Position) + for k, v := range m1 { + m[k] = v + } + for k, v := range m2 { + m[k] = append(m[k], v...) + } + return m +} diff --git a/build/fsutil.go b/build/fsutil.go new file mode 100644 index 000000000..4864833d4 --- /dev/null +++ b/build/fsutil.go @@ -0,0 +1,14 @@ +package build + +import ( + "fmt" + "path/filepath" +) + +func mustAbs(p string) string { + a, err := filepath.Abs(p) + if err != nil { + panic(fmt.Errorf("failed to get absolute path to %s", p)) + } + return a +} diff --git a/build/versionhack/versionhack.go b/build/versionhack/versionhack.go new file mode 100644 index 000000000..86cc7212c --- /dev/null +++ b/build/versionhack/versionhack.go @@ -0,0 +1,47 @@ +// Package versionhack makes sure go/build doesn't disable module support +// whenever GopherJS is compiled by a different Go version than it's targeted +// Go version. +// +// Under the hood, go/build relies on `go list` utility for module support; more +// specifically, for package location discovery. Since ReleaseTags are +// effectively baked into the go binary and can't be overridden, it needs to +// ensure that ReleaseTags set in a go/build.Context instance match the Go tool. +// +// However, it naively assumes that the go tool version in the PATH matches the +// version that was used to build GopherJS and disables module support whenever +// ReleaseTags in the context are set to anything other than the default. This, +// unfortunately, isn't very helpful since gopherjs may be built by a Go version +// other than the PATH's default. +// +// Luckily, even if go tool version is mismatched, it's only used for discovery +// of the package locations, and go/build evaluates build constraints on its own +// with ReleaseTags we've passed. +// +// A better solution would've been for go/build to use go tool from GOROOT and +// check its version against build tags: https://github.com/golang/go/issues/46856. +// +// Until that issue is fixed, we trick go/build into thinking that whatever +// ReleaseTags we've passed are indeed the default. We gain access to the +// variable go/build checks against using "go:linkname" directive and override +// its content as we wish. +package versionhack + +import ( + "go/build" // Must be initialized before this package. + + "github.com/gopherjs/gopherjs/compiler" + + _ "unsafe" // For go:linkname +) + +//go:linkname releaseTags go/build.defaultReleaseTags +var releaseTags []string + +//go:linkname toolTags go/build.defaultToolTags +var toolTags []string + +func init() { + releaseTags = build.Default.ReleaseTags[:compiler.GoVersion] + toolTags = []string{} + build.Default.ToolTags = []string{} +} diff --git a/build/vfs.go b/build/vfs.go new file mode 100644 index 000000000..e3779ecf9 --- /dev/null +++ b/build/vfs.go @@ -0,0 +1,92 @@ +package build + +import ( + "io" + "net/http" + "os" + "path" + "path/filepath" + "strings" +) + +// vfs is a convenience wrapper around http.FileSystem that provides accessor +// methods required by go/build.Context. +type vfs struct{ http.FileSystem } + +func (fs vfs) IsDir(name string) bool { + name = filepath.ToSlash(name) + dir, err := fs.Open(name) + if err != nil { + return false + } + defer dir.Close() + info, err := dir.Stat() + if err != nil { + return false + } + return info.IsDir() +} + +func (fs vfs) ReadDir(name string) (fi []os.FileInfo, err error) { + name = filepath.ToSlash(name) + dir, err := fs.Open(name) + if err != nil { + return nil, err + } + defer dir.Close() + return dir.Readdir(0) +} + +func (fs vfs) OpenFile(name string) (r io.ReadCloser, err error) { + name = filepath.ToSlash(name) + return fs.Open(name) +} + +func splitPathList(list string) []string { + if list == "" { + return nil + } + const pathListSeparator = ":" // UNIX style + return strings.Split(list, pathListSeparator) +} + +// hasSubdir reports whether dir is lexically a subdirectory of +// root, perhaps multiple levels below. It does not try to check +// whether dir exists. +// If so, hasSubdir sets rel to a slash-separated path that +// can be joined to root to produce a path equivalent to dir. +func hasSubdir(root, dir string) (rel string, ok bool) { + // Implementation based on golang.org/x/tools/go/buildutil. + const sep = "/" // UNIX style + root = path.Clean(root) + if !strings.HasSuffix(root, sep) { + root += sep + } + + dir = path.Clean(dir) + if !strings.HasPrefix(dir, root) { + return "", false + } + + return dir[len(root):], true +} + +// withPrefix implements http.FileSystem, which places the underlying FS under +// the given prefix path. +type withPrefix struct { + fs http.FileSystem + prefix string +} + +func (wp *withPrefix) Open(name string) (http.File, error) { + name = filepath.ToSlash(name) + prefix := filepath.ToSlash(wp.prefix) + if !strings.HasPrefix(name, prefix) { + return nil, &os.PathError{Op: "open", Path: name, Err: os.ErrNotExist} + } + f, err := wp.fs.Open(strings.TrimPrefix(name, prefix)) + if err != nil { + return nil, &os.PathError{Op: "open", Path: name, Err: err} + } + return f, nil +} diff --git a/circle.yml b/circle.yml deleted file mode 100644 index ff570187d..000000000 --- a/circle.yml +++ /dev/null @@ -1,31 +0,0 @@ -version: 2 -jobs: - build: - docker: - - image: ubuntu:18.04 - environment: - SOURCE_MAP_SUPPORT: false - working_directory: ~/go/src/github.com/gopherjs/gopherjs - steps: - - run: apt-get update && apt-get install -y sudo curl git python make g++ - - checkout - - run: git clone https://github.com/creationix/nvm $HOME/.nvm && cd $HOME/.nvm && git checkout v0.33.9 && echo 'export NVM_DIR="$HOME/.nvm"' >> $BASH_ENV && echo '[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"' >> $BASH_ENV - - run: nvm install 10.0.0 && nvm alias default 10.0.0 - - run: cd /usr/local && sudo rm -rf go && curl https://storage.googleapis.com/golang/go1.12.16.linux-amd64.tar.gz | sudo tar -xz - - run: echo 'export PATH="$PATH:/usr/local/go/bin:$HOME/go/bin"' >> $BASH_ENV - - run: go get -t -d -v ./... - - run: go install -v - - run: npm install # Install our (dev) dependencies from package.json. - - run: npm install --global node-gyp - - run: cd node-syscall && node-gyp rebuild && mkdir -p ~/.node_libraries && cp build/Release/syscall.node ~/.node_libraries/syscall.node - - - run: go generate github.com/gopherjs/gopherjs/compiler/prelude - - run: diff -u <(echo -n) <(git status --porcelain) - - run: diff -u <(echo -n) <(gofmt -d .) - - run: go vet . # Go package in root directory. - - run: for d in */; do echo ./$d...; done | grep -v ./doc | grep -v ./tests | grep -v ./node | xargs go vet # All subdirectories except "doc", "tests", "node*". - - run: diff -u <(echo -n) <(go list ./compiler/natives/src/...) # All those packages should have // +build js. - - run: gopherjs install -v net/http # Should build successfully (can't run tests, since only client is supported). - - run: ulimit -s 10000 && gopherjs test --minify -v --short github.com/gopherjs/gopherjs/tests/... $(go list std | grep -v -x -f .std_test_pkg_exclusions) - - run: go test -v -race ./... - - run: gopherjs test -v fmt # No minification should work. diff --git a/compiler/analysis/info.go b/compiler/analysis/info.go deleted file mode 100644 index a8181615f..000000000 --- a/compiler/analysis/info.go +++ /dev/null @@ -1,254 +0,0 @@ -package analysis - -import ( - "go/ast" - "go/token" - "go/types" - - "github.com/gopherjs/gopherjs/compiler/astutil" - "github.com/gopherjs/gopherjs/compiler/typesutil" -) - -type continueStmt struct { - forStmt *ast.ForStmt - analyzeStack []ast.Node -} - -type Info struct { - *types.Info - Pkg *types.Package - IsBlocking func(*types.Func) bool - HasPointer map[*types.Var]bool - FuncDeclInfos map[*types.Func]*FuncInfo - FuncLitInfos map[*ast.FuncLit]*FuncInfo - InitFuncInfo *FuncInfo - allInfos []*FuncInfo - comments ast.CommentMap -} - -type FuncInfo struct { - HasDefer bool - Flattened map[ast.Node]bool - Blocking map[ast.Node]bool - GotoLabel map[*types.Label]bool - LocalCalls map[*types.Func][][]ast.Node - ContinueStmts []continueStmt - p *Info - analyzeStack []ast.Node -} - -func (info *Info) newFuncInfo() *FuncInfo { - funcInfo := &FuncInfo{ - p: info, - Flattened: make(map[ast.Node]bool), - Blocking: make(map[ast.Node]bool), - GotoLabel: make(map[*types.Label]bool), - LocalCalls: make(map[*types.Func][][]ast.Node), - } - info.allInfos = append(info.allInfos, funcInfo) - return funcInfo -} - -func AnalyzePkg(files []*ast.File, fileSet *token.FileSet, typesInfo *types.Info, typesPkg *types.Package, isBlocking func(*types.Func) bool) *Info { - info := &Info{ - Info: typesInfo, - Pkg: typesPkg, - HasPointer: make(map[*types.Var]bool), - comments: make(ast.CommentMap), - IsBlocking: isBlocking, - FuncDeclInfos: make(map[*types.Func]*FuncInfo), - FuncLitInfos: make(map[*ast.FuncLit]*FuncInfo), - } - info.InitFuncInfo = info.newFuncInfo() - - for _, file := range files { - for k, v := range ast.NewCommentMap(fileSet, file, file.Comments) { - info.comments[k] = v - } - ast.Walk(info.InitFuncInfo, file) - } - - for { - done := true - for _, funcInfo := range info.allInfos { - for obj, calls := range funcInfo.LocalCalls { - if len(info.FuncDeclInfos[obj].Blocking) != 0 { - for _, call := range calls { - funcInfo.markBlocking(call) - } - delete(funcInfo.LocalCalls, obj) - done = false - } - } - } - if done { - break - } - } - - for _, funcInfo := range info.allInfos { - for _, continueStmt := range funcInfo.ContinueStmts { - if funcInfo.Blocking[continueStmt.forStmt.Post] { - funcInfo.markBlocking(continueStmt.analyzeStack) - } - } - } - - return info -} - -func (c *FuncInfo) Visit(node ast.Node) ast.Visitor { - if node == nil { - if len(c.analyzeStack) != 0 { - c.analyzeStack = c.analyzeStack[:len(c.analyzeStack)-1] - } - return nil - } - c.analyzeStack = append(c.analyzeStack, node) - - switch n := node.(type) { - case *ast.FuncDecl: - newInfo := c.p.newFuncInfo() - c.p.FuncDeclInfos[c.p.Defs[n.Name].(*types.Func)] = newInfo - return newInfo - case *ast.FuncLit: - newInfo := c.p.newFuncInfo() - c.p.FuncLitInfos[n] = newInfo - return newInfo - case *ast.BranchStmt: - switch n.Tok { - case token.GOTO: - for _, n2 := range c.analyzeStack { - c.Flattened[n2] = true - } - c.GotoLabel[c.p.Uses[n.Label].(*types.Label)] = true - case token.CONTINUE: - if n.Label != nil { - label := c.p.Uses[n.Label].(*types.Label) - for i := len(c.analyzeStack) - 1; i >= 0; i-- { - if labelStmt, ok := c.analyzeStack[i].(*ast.LabeledStmt); ok && c.p.Defs[labelStmt.Label] == label { - if _, ok := labelStmt.Stmt.(*ast.RangeStmt); ok { - return nil - } - stack := make([]ast.Node, len(c.analyzeStack)) - copy(stack, c.analyzeStack) - c.ContinueStmts = append(c.ContinueStmts, continueStmt{labelStmt.Stmt.(*ast.ForStmt), stack}) - return nil - } - } - return nil - } - for i := len(c.analyzeStack) - 1; i >= 0; i-- { - if _, ok := c.analyzeStack[i].(*ast.RangeStmt); ok { - return nil - } - if forStmt, ok := c.analyzeStack[i].(*ast.ForStmt); ok { - stack := make([]ast.Node, len(c.analyzeStack)) - copy(stack, c.analyzeStack) - c.ContinueStmts = append(c.ContinueStmts, continueStmt{forStmt, stack}) - return nil - } - } - } - case *ast.CallExpr: - callTo := func(obj types.Object) { - switch o := obj.(type) { - case *types.Func: - if recv := o.Type().(*types.Signature).Recv(); recv != nil { - if _, ok := recv.Type().Underlying().(*types.Interface); ok { - c.markBlocking(c.analyzeStack) - return - } - } - if o.Pkg() != c.p.Pkg { - if c.p.IsBlocking(o) { - c.markBlocking(c.analyzeStack) - } - return - } - stack := make([]ast.Node, len(c.analyzeStack)) - copy(stack, c.analyzeStack) - c.LocalCalls[o] = append(c.LocalCalls[o], stack) - case *types.Var: - c.markBlocking(c.analyzeStack) - } - } - switch f := astutil.RemoveParens(n.Fun).(type) { - case *ast.Ident: - callTo(c.p.Uses[f]) - case *ast.SelectorExpr: - if sel := c.p.Selections[f]; sel != nil && typesutil.IsJsObject(sel.Recv()) { - break - } - callTo(c.p.Uses[f.Sel]) - case *ast.FuncLit: - ast.Walk(c, n.Fun) - for _, arg := range n.Args { - ast.Walk(c, arg) - } - if len(c.p.FuncLitInfos[f].Blocking) != 0 { - c.markBlocking(c.analyzeStack) - } - return nil - default: - if !astutil.IsTypeExpr(f, c.p.Info) { - c.markBlocking(c.analyzeStack) - } - } - case *ast.SendStmt: - c.markBlocking(c.analyzeStack) - case *ast.UnaryExpr: - switch n.Op { - case token.AND: - if id, ok := astutil.RemoveParens(n.X).(*ast.Ident); ok { - c.p.HasPointer[c.p.Uses[id].(*types.Var)] = true - } - case token.ARROW: - c.markBlocking(c.analyzeStack) - } - case *ast.RangeStmt: - if _, ok := c.p.TypeOf(n.X).Underlying().(*types.Chan); ok { - c.markBlocking(c.analyzeStack) - } - case *ast.SelectStmt: - for _, s := range n.Body.List { - if s.(*ast.CommClause).Comm == nil { // default clause - return c - } - } - c.markBlocking(c.analyzeStack) - case *ast.CommClause: - switch comm := n.Comm.(type) { - case *ast.SendStmt: - ast.Walk(c, comm.Chan) - ast.Walk(c, comm.Value) - case *ast.ExprStmt: - ast.Walk(c, comm.X.(*ast.UnaryExpr).X) - case *ast.AssignStmt: - ast.Walk(c, comm.Rhs[0].(*ast.UnaryExpr).X) - } - for _, s := range n.Body { - ast.Walk(c, s) - } - return nil - case *ast.GoStmt: - ast.Walk(c, n.Call.Fun) - for _, arg := range n.Call.Args { - ast.Walk(c, arg) - } - return nil - case *ast.DeferStmt: - c.HasDefer = true - if funcLit, ok := n.Call.Fun.(*ast.FuncLit); ok { - ast.Walk(c, funcLit.Body) - } - } - return c -} - -func (c *FuncInfo) markBlocking(stack []ast.Node) { - for _, n := range stack { - c.Blocking[n] = true - c.Flattened[n] = true - } -} diff --git a/compiler/astutil/astutil.go b/compiler/astutil/astutil.go index 7cd93b3dd..9ff88a48c 100644 --- a/compiler/astutil/astutil.go +++ b/compiler/astutil/astutil.go @@ -1,8 +1,15 @@ package astutil import ( + "fmt" "go/ast" + "go/token" "go/types" + "path" + "reflect" + "regexp" + "strconv" + "strings" ) func RemoveParens(e ast.Expr) ast.Expr { @@ -28,7 +35,15 @@ func NewIdent(name string, t types.Type, info *types.Info, pkg *types.Package) * return ident } +// IsTypeExpr returns true if expr denotes a type. This can be used to +// distinguish between calls and type conversions. func IsTypeExpr(expr ast.Expr, info *types.Info) bool { + // Note that we could've used info.Types[expr].IsType() instead of doing our + // own analysis. However, that creates a problem because we synthesize some + // *ast.CallExpr nodes and, more importantly, *ast.Ident nodes that denote a + // type. Unfortunately, because the flag that controls + // types.TypeAndValue.IsType() return value is unexported we wouldn't be able + // to set it correctly. Thus, we can't rely on IsType(). switch e := expr.(type) { case *ast.ArrayType, *ast.ChanType, *ast.FuncType, *ast.InterfaceType, *ast.MapType, *ast.StructType: return true @@ -40,9 +55,253 @@ func IsTypeExpr(expr ast.Expr, info *types.Info) bool { case *ast.SelectorExpr: _, ok := info.Uses[e.Sel].(*types.TypeName) return ok + case *ast.IndexExpr: + ident, ok := e.X.(*ast.Ident) + if !ok { + return false + } + _, ok = info.Uses[ident].(*types.TypeName) + return ok + case *ast.IndexListExpr: + ident, ok := e.X.(*ast.Ident) + if !ok { + return false + } + _, ok = info.Uses[ident].(*types.TypeName) + return ok case *ast.ParenExpr: return IsTypeExpr(e.X, info) default: return false } } + +func ImportsUnsafe(file *ast.File) bool { + for _, imp := range file.Imports { + if imp.Path.Value == `"unsafe"` { + return true + } + } + return false +} + +// ImportName tries to determine the package name for an import. +// +// If the package name isn't specified then this will make a best +// make a best guess using the import path. +// If the import name is dot (`.`), blank (`_`), or there +// was an issue determining the package name then empty is returned. +func ImportName(spec *ast.ImportSpec) string { + var name string + if spec.Name != nil { + name = spec.Name.Name + } else { + importPath, _ := strconv.Unquote(spec.Path.Value) + name = path.Base(importPath) + } + + switch name { + case `_`, `.`, `/`: + return `` + default: + return name + } +} + +// FuncKey returns a string, which uniquely identifies a top-level function or +// method in a package. +func FuncKey(d *ast.FuncDecl) string { + if recvKey := FuncReceiverKey(d); len(recvKey) > 0 { + return recvKey + "." + d.Name.Name + } + return d.Name.Name +} + +// FuncReceiverKey returns a string that uniquely identifies the receiver +// struct of the function or an empty string if there is no receiver. +// This name will match the name of the struct in the struct's type spec. +func FuncReceiverKey(d *ast.FuncDecl) string { + if d == nil || d.Recv == nil || len(d.Recv.List) == 0 { + return `` + } + recv := d.Recv.List[0].Type + for { + switch r := recv.(type) { + case *ast.IndexListExpr: + recv = r.X + continue + case *ast.IndexExpr: + recv = r.X + continue + case *ast.StarExpr: + recv = r.X + continue + case *ast.Ident: + return r.Name + default: + panic(fmt.Errorf(`unexpected type %T in receiver of function: %v`, recv, d)) + } + } +} + +// KeepOriginal returns true if gopherjs:keep-original directive is present +// before a function decl. +// +// `//gopherjs:keep-original` is a GopherJS-specific directive, which can be +// applied to functions in native overlays and will instruct the augmentation +// logic to expose the original function such that it can be called. For a +// function in the original called `foo`, it will be accessible by the name +// `_gopherjs_original_foo`. +func KeepOriginal(d *ast.FuncDecl) bool { + return hasDirective(d, `keep-original`) +} + +// Purge returns true if gopherjs:purge directive is present +// on a struct, interface, type, variable, constant, or function. +// +// `//gopherjs:purge` is a GopherJS-specific directive, which can be +// applied in native overlays and will instruct the augmentation logic to +// delete part of the standard library without a replacement. This directive +// can be used to remove code that would be invalid in GopherJS, such as code +// using unsupported features (e.g. generic interfaces before generics were +// fully supported). It should be used with caution since it may remove needed +// dependencies. If a type is purged, all methods using that type as +// a receiver will also be purged. +func Purge(d ast.Node) bool { + return hasDirective(d, `purge`) +} + +// OverrideSignature returns true if gopherjs:override-signature directive is +// present on a function. +// +// `//gopherjs:override-signature` is a GopherJS-specific directive, which can +// be applied in native overlays and will instruct the augmentation logic to +// replace the original function signature which has the same FuncKey with the +// signature defined in the native overlays. +// This directive can be used to remove generics from a function signature or +// to replace a receiver of a function with another one. The given native +// overlay function will be removed, so no method body is needed in the overlay. +// +// The new signature may not contain types which require a new import since +// the imports will not be automatically added when needed, only removed. +// Use a type alias in the overlay to deal manage imports. +func OverrideSignature(d *ast.FuncDecl) bool { + return hasDirective(d, `override-signature`) +} + +// directiveMatcher is a regex which matches a GopherJS directive +// and finds the directive action. +var directiveMatcher = regexp.MustCompile(`^\/(?:\/|\*)gopherjs:([\w-]+)`) + +// hasDirective returns true if the associated documentation +// or line comments for the given node have the given directive action. +// +// All GopherJS-specific directives must start with `//gopherjs:` or +// `/*gopherjs:` and followed by an action without any whitespace. The action +// must be one or more letter, decimal, underscore, or hyphen. +// +// see https://pkg.go.dev/cmd/compile#hdr-Compiler_Directives +func hasDirective(node ast.Node, directiveAction string) bool { + foundDirective := false + ast.Inspect(node, func(n ast.Node) bool { + switch a := n.(type) { + case *ast.Comment: + m := directiveMatcher.FindStringSubmatch(a.Text) + if len(m) == 2 && m[1] == directiveAction { + foundDirective = true + } + return false + case *ast.CommentGroup: + return !foundDirective + default: + return n == node + } + }) + return foundDirective +} + +// HasDirectivePrefix determines if any line in the given file +// has the given directive prefix in it. +func HasDirectivePrefix(file *ast.File, prefix string) bool { + for _, cg := range file.Comments { + for _, c := range cg.List { + if strings.HasPrefix(c.Text, prefix) { + return true + } + } + } + return false +} + +// FindLoopStmt tries to find the loop statement among the AST nodes in the +// |stack| that corresponds to the break/continue statement represented by +// branch. +// +// This function is label-aware and assumes the code was successfully +// type-checked. +func FindLoopStmt(stack []ast.Node, branch *ast.BranchStmt, typeInfo *types.Info) ast.Stmt { + if branch.Tok != token.CONTINUE && branch.Tok != token.BREAK { + panic(fmt.Errorf("FindLoopStmt() must be used with a break or continue statement only, got: %v", branch)) + } + + for i := len(stack) - 1; i >= 0; i-- { + n := stack[i] + + if branch.Label != nil { + // For a labelled continue the loop will always be in a labelled statement. + referencedLabel := typeInfo.Uses[branch.Label].(*types.Label) + labelStmt, ok := n.(*ast.LabeledStmt) + if !ok { + continue + } + if definedLabel := typeInfo.Defs[labelStmt.Label]; definedLabel != referencedLabel { + continue + } + n = labelStmt.Stmt + } + + switch s := n.(type) { + case *ast.RangeStmt, *ast.ForStmt: + return s.(ast.Stmt) + } + } + + // This should never happen in a source that passed type checking. + panic(fmt.Errorf("continue/break statement %v doesn't have a matching loop statement among ancestors", branch)) +} + +// EndsWithReturn returns true if the last effective statement is a "return". +func EndsWithReturn(stmts []ast.Stmt) bool { + if len(stmts) == 0 { + return false + } + last := stmts[len(stmts)-1] + switch l := last.(type) { + case *ast.ReturnStmt: + return true + case *ast.LabeledStmt: + return EndsWithReturn([]ast.Stmt{l.Stmt}) + case *ast.BlockStmt: + return EndsWithReturn(l.List) + default: + return false + } +} + +// Squeeze removes all nil nodes from the slice. +// +// The given slice will be modified. This is designed for squeezing +// declaration, specification, imports, and identifier lists. +func Squeeze[E ast.Node, S ~[]E](s S) S { + var zero E + count, dest := len(s), 0 + for src := 0; src < count; src++ { + if !reflect.DeepEqual(s[src], zero) { + // Swap the values, this will put the nil values to the end + // of the slice so that the tail isn't holding onto pointers. + s[dest], s[src] = s[src], s[dest] + dest++ + } + } + return s[:dest] +} diff --git a/compiler/astutil/astutil_test.go b/compiler/astutil/astutil_test.go new file mode 100644 index 000000000..56dabc510 --- /dev/null +++ b/compiler/astutil/astutil_test.go @@ -0,0 +1,590 @@ +package astutil + +import ( + "go/ast" + "strconv" + "testing" + + "github.com/gopherjs/gopherjs/internal/srctesting" +) + +func TestImportsUnsafe(t *testing.T) { + tests := []struct { + desc string + imports string + want bool + }{ + { + desc: "no imports", + imports: "", + want: false, + }, { + desc: "other imports", + imports: `import "some/other/package"`, + want: false, + }, { + desc: "only unsafe", + imports: `import "unsafe"`, + want: true, + }, { + desc: "multi-import decl", + imports: `import ( + "some/other/package" + "unsafe" + )`, + want: true, + }, { + desc: "two import decls", + imports: `import "some/other/package" + import "unsafe"`, + want: true, + }, + } + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + src := "package testpackage\n\n" + test.imports + file := srctesting.New(t).Parse("test.go", src) + got := ImportsUnsafe(file) + if got != test.want { + t.Fatalf("ImportsUnsafe() returned %t, want %t", got, test.want) + } + }) + } +} + +func TestImportName(t *testing.T) { + tests := []struct { + desc string + src string + want string + }{ + { + desc: `named import`, + src: `import foo "some/other/bar"`, + want: `foo`, + }, { + desc: `unnamed import`, + src: `import "some/other/bar"`, + want: `bar`, + }, { + desc: `dot import`, + src: `import . "some/other/bar"`, + want: ``, + }, { + desc: `blank import`, + src: `import _ "some/other/bar"`, + want: ``, + }, + } + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + src := "package testpackage\n\n" + test.src + file := srctesting.New(t).Parse("test.go", src) + if len(file.Imports) != 1 { + t.Fatal(`expected one and only one import`) + } + importSpec := file.Imports[0] + got := ImportName(importSpec) + if got != test.want { + t.Fatalf(`ImportName() returned %q, want %q`, got, test.want) + } + }) + } +} + +func TestFuncKey(t *testing.T) { + tests := []struct { + desc string + src string + want string + }{ + { + desc: `top-level function`, + src: `func foo() {}`, + want: `foo`, + }, { + desc: `top-level exported function`, + src: `func Foo() {}`, + want: `Foo`, + }, { + desc: `method on reference`, + src: `func (_ myType) bar() {}`, + want: `myType.bar`, + }, { + desc: `method on pointer`, + src: ` func (_ *myType) bar() {}`, + want: `myType.bar`, + }, { + desc: `method on generic reference`, + src: ` func (_ myType[T]) bar() {}`, + want: `myType.bar`, + }, { + desc: `method on generic pointer`, + src: ` func (_ *myType[T]) bar() {}`, + want: `myType.bar`, + }, { + desc: `method on struct with multiple generics`, + src: ` func (_ *myType[T1, T2, T3, T4]) bar() {}`, + want: `myType.bar`, + }, + } + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + src := `package testpackage; ` + test.src + fdecl := srctesting.ParseFuncDecl(t, src) + if got := FuncKey(fdecl); got != test.want { + t.Errorf(`Got %q, want %q`, got, test.want) + } + }) + } +} + +func TestHasDirectiveOnDecl(t *testing.T) { + tests := []struct { + desc string + src string + want bool + }{ + { + desc: `no comment on function`, + src: `package testpackage; + func foo() {}`, + want: false, + }, { + desc: `no directive on function with comment`, + src: `package testpackage; + // foo has no directive + func foo() {}`, + want: false, + }, { + desc: `wrong directive on function`, + src: `package testpackage; + //gopherjs:wrong-directive + func foo() {}`, + want: false, + }, { + desc: `correct directive on function`, + src: `package testpackage; + //gopherjs:do-stuff + // foo has a directive to do stuff + func foo() {}`, + want: true, + }, { + desc: `correct directive in multiline comment on function`, + src: `package testpackage; + /*gopherjs:do-stuff + foo has a directive to do stuff + */ + func foo() {}`, + want: true, + }, { + desc: `invalid directive in multiline comment on function`, + src: `package testpackage; + /* + gopherjs:do-stuff + */ + func foo() {}`, + want: false, + }, { + desc: `prefix directive on function`, + src: `package testpackage; + //gopherjs:do-stuffs + func foo() {}`, + want: false, + }, { + desc: `multiple directives on function`, + src: `package testpackage; + //gopherjs:wrong-directive + //gopherjs:do-stuff + //gopherjs:another-directive + func foo() {}`, + want: true, + }, { + desc: `directive with explanation on function`, + src: `package testpackage; + //gopherjs:do-stuff 'cause we can + func foo() {}`, + want: true, + }, { + desc: `no directive on type declaration`, + src: `package testpackage; + // Foo has a comment + type Foo int`, + want: false, + }, { + desc: `directive on type declaration`, + src: `package testpackage; + //gopherjs:do-stuff + type Foo int`, + want: true, + }, { + desc: `directive on specification, not on declaration`, + src: `package testpackage; + type ( + Foo int + + //gopherjs:do-stuff + Bar struct{} + )`, + want: false, + }, { + desc: `no directive on const declaration`, + src: `package testpackage; + const foo = 42`, + want: false, + }, { + desc: `directive on const documentation`, + src: `package testpackage; + //gopherjs:do-stuff + const foo = 42`, + want: true, + }, { + desc: `no directive on var declaration`, + src: `package testpackage; + var foo = 42`, + want: false, + }, { + desc: `directive on var documentation`, + src: `package testpackage; + //gopherjs:do-stuff + var foo = 42`, + want: true, + }, { + desc: `no directive on var declaration`, + src: `package testpackage; + import _ "embed"`, + want: false, + }, { + desc: `directive on var documentation`, + src: `package testpackage; + //gopherjs:do-stuff + import _ "embed"`, + want: true, + }, + } + + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + const action = `do-stuff` + decl := srctesting.ParseDecl(t, test.src) + if got := hasDirective(decl, action); got != test.want { + t.Errorf(`hasDirective(%T, %q) returned %t, want %t`, decl, action, got, test.want) + } + }) + } +} + +func TestHasDirectiveOnSpec(t *testing.T) { + tests := []struct { + desc string + src string + want bool + }{ + { + desc: `no directive on type specification`, + src: `package testpackage; + type Foo int`, + want: false, + }, { + desc: `directive on declaration, not on specification`, + src: `package testpackage; + //gopherjs:do-stuff + type Foo int`, + want: false, + }, { + desc: `directive in doc on type specification`, + src: `package testpackage; + type ( + //gopherjs:do-stuff + Foo int + )`, + want: true, + }, { + desc: `directive in line on type specification`, + src: `package testpackage; + type Foo int //gopherjs:do-stuff`, + want: true, + }, { + desc: `no directive on const specification`, + src: `package testpackage; + const foo = 42`, + want: false, + }, { + desc: `directive in doc on const specification`, + src: `package testpackage; + const ( + //gopherjs:do-stuff + foo = 42 + )`, + want: true, + }, { + desc: `directive in line on const specification`, + src: `package testpackage; + const foo = 42 //gopherjs:do-stuff`, + want: true, + }, { + desc: `no directive on var specification`, + src: `package testpackage; + var foo = 42`, + want: false, + }, { + desc: `directive in doc on var specification`, + src: `package testpackage; + var ( + //gopherjs:do-stuff + foo = 42 + )`, + want: true, + }, { + desc: `directive in line on var specification`, + src: `package testpackage; + var foo = 42 //gopherjs:do-stuff`, + want: true, + }, { + desc: `no directive on import specification`, + src: `package testpackage; + import _ "embed"`, + want: false, + }, { + desc: `directive in doc on import specification`, + src: `package testpackage; + import ( + //gopherjs:do-stuff + _ "embed" + )`, + want: true, + }, { + desc: `directive in line on import specification`, + src: `package testpackage; + import _ "embed" //gopherjs:do-stuff`, + want: true, + }, + } + + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + const action = `do-stuff` + spec := srctesting.ParseSpec(t, test.src) + if got := hasDirective(spec, action); got != test.want { + t.Errorf(`hasDirective(%T, %q) returned %t, want %t`, spec, action, got, test.want) + } + }) + } +} + +func TestHasDirectiveOnFile(t *testing.T) { + tests := []struct { + desc string + src string + want bool + }{ + { + desc: `no directive on file`, + src: `package testpackage; + //gopherjs:do-stuff + type Foo int`, + want: false, + }, { + desc: `directive on file`, + src: `//gopherjs:do-stuff + package testpackage; + type Foo int`, + want: true, + }, + } + + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + const action = `do-stuff` + file := srctesting.New(t).Parse("test.go", test.src) + if got := hasDirective(file, action); got != test.want { + t.Errorf(`hasDirective(%T, %q) returned %t, want %t`, file, action, got, test.want) + } + }) + } +} + +func TestHasDirectiveOnField(t *testing.T) { + tests := []struct { + desc string + src string + want bool + }{ + { + desc: `no directive on struct field`, + src: `package testpackage; + type Foo struct { + bar int + }`, + want: false, + }, { + desc: `directive in doc on struct field`, + src: `package testpackage; + type Foo struct { + //gopherjs:do-stuff + bar int + }`, + want: true, + }, { + desc: `directive in line on struct field`, + src: `package testpackage; + type Foo struct { + bar int //gopherjs:do-stuff + }`, + want: true, + }, { + desc: `no directive on interface method`, + src: `package testpackage; + type Foo interface { + Bar(a int) int + }`, + want: false, + }, { + desc: `directive in doc on interface method`, + src: `package testpackage; + type Foo interface { + //gopherjs:do-stuff + Bar(a int) int + }`, + want: true, + }, { + desc: `directive in line on interface method`, + src: `package testpackage; + type Foo interface { + Bar(a int) int //gopherjs:do-stuff + }`, + want: true, + }, + } + + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + const action = `do-stuff` + spec := srctesting.ParseSpec(t, test.src) + tspec := spec.(*ast.TypeSpec) + var field *ast.Field + switch typeNode := tspec.Type.(type) { + case *ast.StructType: + field = typeNode.Fields.List[0] + case *ast.InterfaceType: + field = typeNode.Methods.List[0] + default: + t.Errorf(`unexpected node type, %T, when finding field`, typeNode) + return + } + if got := hasDirective(field, action); got != test.want { + t.Errorf(`hasDirective(%T, %q) returned %t, want %t`, field, action, got, test.want) + } + }) + } +} + +func TestEndsWithReturn(t *testing.T) { + tests := []struct { + desc string + src string + want bool + }{ + { + desc: "empty function", + src: `func foo() {}`, + want: false, + }, { + desc: "implicit return", + src: `func foo() { a() }`, + want: false, + }, { + desc: "explicit return", + src: `func foo() { a(); return }`, + want: true, + }, { + desc: "labelled return", + src: `func foo() { Label: return }`, + want: true, + }, { + desc: "labelled call", + src: `func foo() { Label: a() }`, + want: false, + }, { + desc: "return in a block", + src: `func foo() { a(); { b(); return; } }`, + want: true, + }, { + desc: "a block without return", + src: `func foo() { a(); { b(); c(); } }`, + want: false, + }, { + desc: "conditional block", + src: `func foo() { a(); if x { b(); return; } }`, + want: false, + }, + } + + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + fdecl := srctesting.ParseFuncDecl(t, "package testpackage\n"+test.src) + got := EndsWithReturn(fdecl.Body.List) + if got != test.want { + t.Errorf("EndsWithReturn() returned %t, want %t", got, test.want) + } + }) + } +} + +func TestSqueezeIdents(t *testing.T) { + tests := []struct { + desc string + count int + assign []int + }{ + { + desc: `no squeezing`, + count: 5, + assign: []int{0, 1, 2, 3, 4}, + }, { + desc: `missing front`, + count: 5, + assign: []int{3, 4}, + }, { + desc: `missing back`, + count: 5, + assign: []int{0, 1, 2}, + }, { + desc: `missing several`, + count: 10, + assign: []int{1, 2, 3, 6, 8}, + }, { + desc: `empty`, + count: 0, + assign: []int{}, + }, + } + + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + input := make([]*ast.Ident, test.count) + for _, i := range test.assign { + input[i] = ast.NewIdent(strconv.Itoa(i)) + } + + result := Squeeze(input) + if len(result) != len(test.assign) { + t.Errorf("Squeeze() returned a slice %d long, want %d", len(result), len(test.assign)) + } + for i, id := range input { + if i < len(result) { + if id == nil { + t.Errorf(`Squeeze() returned a nil in result at %d`, i) + } else { + value, err := strconv.Atoi(id.Name) + if err != nil || value != test.assign[i] { + t.Errorf(`Squeeze() returned %s at %d instead of %d`, id.Name, i, test.assign[i]) + } + } + } else if id != nil { + t.Errorf(`Squeeze() didn't clear out tail of slice, want %d nil`, i) + } + } + }) + } +} diff --git a/compiler/compiler.go b/compiler/compiler.go index 81acc872d..e8264c946 100644 --- a/compiler/compiler.go +++ b/compiler/compiler.go @@ -1,3 +1,8 @@ +// Package compiler implements GopherJS compiler logic. +// +// WARNING: This package's API is treated as internal and currently doesn't +// provide any API stability guarantee, use it at your own risk. If you need a +// stable interface, prefer invoking the gopherjs CLI tool as a subprocess. package compiler import ( @@ -10,13 +15,18 @@ import ( "go/types" "io" "strings" + "time" + "github.com/gopherjs/gopherjs/compiler/internal/dce" + "github.com/gopherjs/gopherjs/compiler/linkname" "github.com/gopherjs/gopherjs/compiler/prelude" "golang.org/x/tools/go/gcexportdata" ) -var sizes32 = &types.StdSizes{WordSize: 4, MaxAlign: 8} -var reservedKeywords = make(map[string]bool) +var ( + sizes32 = &types.StdSizes{WordSize: 4, MaxAlign: 8} + reservedKeywords = make(map[string]bool) +) func init() { for _, keyword := range []string{"abstract", "arguments", "boolean", "break", "byte", "case", "catch", "char", "class", "const", "continue", "debugger", "default", "delete", "do", "double", "else", "enum", "eval", "export", "extends", "false", "final", "finally", "float", "for", "function", "goto", "if", "implements", "import", "in", "instanceof", "int", "interface", "let", "long", "native", "new", "null", "package", "private", "protected", "public", "return", "short", "static", "super", "switch", "synchronized", "this", "throw", "throws", "transient", "true", "try", "typeof", "undefined", "var", "void", "volatile", "while", "with", "yield"} { @@ -24,34 +34,37 @@ func init() { } } -type ErrorList []error - -func (err ErrorList) Error() string { - return err[0].Error() -} - +// Archive contains intermediate build outputs of a single package. +// +// This is a logical equivalent of an object file in traditional compilers. type Archive struct { - ImportPath string - Name string - Imports []string - ExportData []byte + // Package's full import path, e.g. "some/package/name". + ImportPath string + // Package's name as per "package" statement at the top of a source file. + // Usually matches the last component of import path, but may differ in + // certain cases (e.g. main or test packages). + Name string + // A list of full package import paths that the current package imports across + // all source files. See go/types.Package.Imports(). + Imports []string + // The package information is used by the compiler to type-check packages + // that import this one. See [gcexportdata.Write]. + Package *types.Package + // Compiled package-level symbols. Declarations []*Decl - IncJSCode []byte - FileSet []byte - Minified bool + // Concatenated contents of all raw .inc.js of the package. + IncJSCode []byte + // The file set containing the source code locations for various symbols + // (e.g. for sourcemap generation). See [token.FileSet.Write]. + FileSet *token.FileSet + // Whether or not the package was compiled with minification enabled. + Minified bool + // A list of go:linkname directives encountered in the package. + GoLinknames []linkname.GoLinkname } -type Decl struct { - FullName string - Vars []string - DeclCode []byte - MethodListCode []byte - TypeInitCode []byte - InitCode []byte - DceObjectFilter string - DceMethodFilter string - DceDeps []string - Blocking bool +func (a Archive) String() string { + return fmt.Sprintf("compiler.Archive{%s}", a.ImportPath) } type Dependency struct { @@ -95,67 +108,42 @@ func ImportDependencies(archive *Archive, importPkg func(string) (*Archive, erro return deps, nil } -type dceInfo struct { - decl *Decl - objectFilter string - methodFilter string -} - -func WriteProgramCode(pkgs []*Archive, w *SourceMapFilter) error { +func WriteProgramCode(pkgs []*Archive, w *SourceMapFilter, goVersion string) error { mainPkg := pkgs[len(pkgs)-1] minify := mainPkg.Minified - byFilter := make(map[string][]*dceInfo) - var pendingDecls []*Decl + // Aggregate all go:linkname directives in the program together. + gls := linkname.GoLinknameSet{} for _, pkg := range pkgs { - for _, d := range pkg.Declarations { - if d.DceObjectFilter == "" && d.DceMethodFilter == "" { - pendingDecls = append(pendingDecls, d) - continue - } - info := &dceInfo{decl: d} - if d.DceObjectFilter != "" { - info.objectFilter = pkg.ImportPath + "." + d.DceObjectFilter - byFilter[info.objectFilter] = append(byFilter[info.objectFilter], info) - } - if d.DceMethodFilter != "" { - info.methodFilter = pkg.ImportPath + "." + d.DceMethodFilter - byFilter[info.methodFilter] = append(byFilter[info.methodFilter], info) - } - } + gls.Add(pkg.GoLinknames) } - dceSelection := make(map[*Decl]struct{}) - for len(pendingDecls) != 0 { - d := pendingDecls[len(pendingDecls)-1] - pendingDecls = pendingDecls[:len(pendingDecls)-1] - - dceSelection[d] = struct{}{} - - for _, dep := range d.DceDeps { - if infos, ok := byFilter[dep]; ok { - delete(byFilter, dep) - for _, info := range infos { - if info.objectFilter == dep { - info.objectFilter = "" - } - if info.methodFilter == dep { - info.methodFilter = "" - } - if info.objectFilter == "" && info.methodFilter == "" { - pendingDecls = append(pendingDecls, info.decl) - } - } + sel := &dce.Selector[*Decl]{} + for _, pkg := range pkgs { + for _, d := range pkg.Declarations { + implementsLink := false + if gls.IsImplementation(d.LinkingName) { + // If a decl is referenced by a go:linkname directive, we just assume + // it's not dead. + // TODO(nevkontakte): This is a safe, but imprecise assumption. We should + // try and trace whether the referencing functions are actually live. + implementsLink = true } + sel.Include(d, implementsLink) } } + dceSelection := sel.AliveDecls() if _, err := w.Write([]byte("\"use strict\";\n(function() {\n\n")); err != nil { return err } + if _, err := w.Write([]byte(fmt.Sprintf("var $goVersion = %q;\n", goVersion))); err != nil { + return err + } + preludeJS := prelude.Prelude if minify { - preludeJS = prelude.Minified + preludeJS = prelude.Minified() } if _, err := io.WriteString(w, preludeJS); err != nil { return err @@ -166,24 +154,20 @@ func WriteProgramCode(pkgs []*Archive, w *SourceMapFilter) error { // write packages for _, pkg := range pkgs { - if err := WritePkgCode(pkg, dceSelection, minify, w); err != nil { + if err := WritePkgCode(pkg, dceSelection, gls, minify, w); err != nil { return err } } - if _, err := w.Write([]byte("$synthesizeMethods();\nvar $mainPkg = $packages[\"" + string(mainPkg.ImportPath) + "\"];\n$packages[\"runtime\"].$init();\n$go($mainPkg.$init, []);\n$flushConsole();\n\n}).call(this);\n")); err != nil { + if _, err := w.Write([]byte("$synthesizeMethods();\n$initAllLinknames();\nvar $mainPkg = $packages[\"" + string(mainPkg.ImportPath) + "\"];\n$packages[\"runtime\"].$init();\n$go($mainPkg.$init, []);\n$flushConsole();\n\n}).call(this);\n")); err != nil { return err } - return nil } -func WritePkgCode(pkg *Archive, dceSelection map[*Decl]struct{}, minify bool, w *SourceMapFilter) error { +func WritePkgCode(pkg *Archive, dceSelection map[*Decl]struct{}, gls linkname.GoLinknameSet, minify bool, w *SourceMapFilter) error { if w.MappingCallback != nil && pkg.FileSet != nil { - w.fileSet = token.NewFileSet() - if err := w.fileSet.Read(json.NewDecoder(bytes.NewReader(pkg.FileSet)).Decode); err != nil { - panic(err) - } + w.fileSet = pkg.FileSet } if _, err := w.Write(pkg.IncJSCode); err != nil { return err @@ -206,6 +190,20 @@ func WritePkgCode(pkg *Archive, dceSelection map[*Decl]struct{}, minify bool, w if _, err := w.Write(d.DeclCode); err != nil { return err } + if gls.IsImplementation(d.LinkingName) { + // This decl is referenced by a go:linkname directive, expose it to external + // callers via $linkname object (declared in prelude). We are not using + // $pkg to avoid clashes with exported symbols. + var code string + if recv, method, ok := d.LinkingName.IsMethod(); ok { + code = fmt.Sprintf("\t$linknames[%q] = $unsafeMethodToFunction(%v,%q,%t);\n", d.LinkingName.String(), d.NamedRecvType, method, strings.HasPrefix(recv, "*")) + } else { + code = fmt.Sprintf("\t$linknames[%q] = %s;\n", d.LinkingName.String(), d.RefExpr) + } + if _, err := w.Write(removeWhitespace([]byte(code), minify)); err != nil { + return err + } + } } for _, d := range filteredDecls { if _, err := w.Write(d.MethodListCode); err != nil { @@ -218,6 +216,29 @@ func WritePkgCode(pkg *Archive, dceSelection map[*Decl]struct{}, minify bool, w } } + { + // Set up all functions which package declares, but which implementation + // comes from elsewhere via a go:linkname compiler directive. This code + // needs to be executed after all $packages entries were defined, since such + // reference may go in a direction opposite of the import graph. It also + // needs to run before any initializer code runs, since that code may invoke + // linknamed function. + lines := []string{} + for _, d := range filteredDecls { + impl, found := gls.FindImplementation(d.LinkingName) + if !found { + continue // The symbol is not affected by a go:linkname directive. + } + lines = append(lines, fmt.Sprintf("\t\t%s = $linknames[%q];\n", d.RefExpr, impl.String())) + } + if len(lines) > 0 { + code := fmt.Sprintf("\t$pkg.$initLinknames = function() {\n%s};\n", strings.Join(lines, "")) + if _, err := w.Write(removeWhitespace([]byte(code), minify)); err != nil { + return err + } + } + } + if _, err := w.Write(removeWhitespace([]byte("\t$init = function() {\n\t\t$pkg.$init = function() {};\n\t\t/* */ var $f, $c = false, $s = 0, $r; if (this !== undefined && this.$blk !== undefined) { $f = this; $c = true; $s = $f.$s; $r = $f.$r; } s: while (true) { switch ($s) { case 0:\n"), minify)); err != nil { return err } @@ -235,23 +256,98 @@ func WritePkgCode(pkg *Archive, dceSelection map[*Decl]struct{}, minify bool, w return nil } -func ReadArchive(filename, path string, r io.Reader, packages map[string]*types.Package) (*Archive, error) { +type serializableArchive struct { + ImportPath string + Name string + Imports []string + ExportData []byte + Declarations []*Decl + IncJSCode []byte + FileSet []byte + Minified bool + GoLinknames []linkname.GoLinkname + BuildTime time.Time +} + +// ReadArchive reads serialized compiled archive of the importPath package. +// +// The given srcModTime is used to determine if the archive is out-of-date. +// If the archive is out-of-date, the returned archive is nil. +// If there was not an error, the returned time is when the archive was built. +// +// The imports map is used to resolve package dependencies and may modify the +// map to include the package from the read archive. See [gcexportdata.Read]. +func ReadArchive(importPath string, r io.Reader, srcModTime time.Time, imports map[string]*types.Package) (*Archive, time.Time, error) { + var sa serializableArchive + if err := gob.NewDecoder(r).Decode(&sa); err != nil { + return nil, time.Time{}, err + } + + if srcModTime.After(sa.BuildTime) { + // Archive is out-of-date. + return nil, sa.BuildTime, nil + } + var a Archive - if err := gob.NewDecoder(r).Decode(&a); err != nil { - return nil, err + fset := token.NewFileSet() + if len(sa.ExportData) > 0 { + pkg, err := gcexportdata.Read(bytes.NewReader(sa.ExportData), fset, imports, importPath) + if err != nil { + return nil, sa.BuildTime, err + } + a.Package = pkg } - var err error - packages[path], err = gcexportdata.Read(bytes.NewReader(a.ExportData), token.NewFileSet(), packages, path) - if err != nil { - return nil, err + if len(sa.FileSet) > 0 { + a.FileSet = token.NewFileSet() + if err := a.FileSet.Read(json.NewDecoder(bytes.NewReader(sa.FileSet)).Decode); err != nil { + return nil, sa.BuildTime, err + } } - return &a, nil + a.ImportPath = sa.ImportPath + a.Name = sa.Name + a.Imports = sa.Imports + a.Declarations = sa.Declarations + a.IncJSCode = sa.IncJSCode + a.Minified = sa.Minified + a.GoLinknames = sa.GoLinknames + return &a, sa.BuildTime, nil } -func WriteArchive(a *Archive, w io.Writer) error { - return gob.NewEncoder(w).Encode(a) +// WriteArchive writes compiled package archive on disk for later reuse. +// +// The passed in buildTime is used to determine if the archive is out-of-date. +// Typically it should be set to the srcModTime or time.Now() but it is exposed for testing purposes. +func WriteArchive(a *Archive, buildTime time.Time, w io.Writer) error { + exportData := new(bytes.Buffer) + if a.Package != nil { + if err := gcexportdata.Write(exportData, nil, a.Package); err != nil { + return fmt.Errorf("failed to write export data: %w", err) + } + } + + encodedFileSet := new(bytes.Buffer) + if a.FileSet != nil { + if err := a.FileSet.Write(json.NewEncoder(encodedFileSet).Encode); err != nil { + return err + } + } + + sa := serializableArchive{ + ImportPath: a.ImportPath, + Name: a.Name, + Imports: a.Imports, + ExportData: exportData.Bytes(), + Declarations: a.Declarations, + IncJSCode: a.IncJSCode, + FileSet: encodedFileSet.Bytes(), + Minified: a.Minified, + GoLinknames: a.GoLinknames, + BuildTime: buildTime, + } + + return gob.NewEncoder(w).Encode(sa) } type SourceMapFilter struct { diff --git a/compiler/compiler_test.go b/compiler/compiler_test.go new file mode 100644 index 000000000..88d8e525e --- /dev/null +++ b/compiler/compiler_test.go @@ -0,0 +1,1179 @@ +package compiler + +import ( + "bytes" + "go/types" + "regexp" + "sort" + "strings" + "testing" + "time" + + "github.com/google/go-cmp/cmp" + "golang.org/x/tools/go/packages" + + "github.com/gopherjs/gopherjs/compiler/internal/dce" + "github.com/gopherjs/gopherjs/compiler/linkname" + "github.com/gopherjs/gopherjs/compiler/sources" + "github.com/gopherjs/gopherjs/internal/srctesting" +) + +func TestOrder(t *testing.T) { + fileA := ` + package foo + + var Avar = "a" + + type Atype struct{} + + func Afunc() int { + var varA = 1 + var varB = 2 + return varA+varB + }` + + fileB := ` + package foo + + var Bvar = "b" + + type Btype struct{} + + func Bfunc() int { + var varA = 1 + var varB = 2 + return varA+varB + }` + + files := []srctesting.Source{ + {Name: "fileA.go", Contents: []byte(fileA)}, + {Name: "fileB.go", Contents: []byte(fileB)}, + } + + compareOrder(t, files, false) + compareOrder(t, files, true) +} + +func TestDeclSelection_KeepUnusedExportedMethods(t *testing.T) { + src := ` + package main + type Foo struct {} + func (f Foo) Bar() { + println("bar") + } + func (f Foo) Baz() { // unused + println("baz") + } + func main() { + Foo{}.Bar() + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + sel := declSelection(t, srcFiles, nil) + + sel.IsAlive(`type:command-line-arguments.Foo`) + sel.IsAlive(`func:command-line-arguments.Foo.Bar`) + sel.IsAlive(`func:command-line-arguments.Foo.Baz`) +} + +func TestDeclSelection_RemoveUnusedUnexportedMethods(t *testing.T) { + src := ` + package main + type Foo struct {} + func (f Foo) Bar() { + println("bar") + } + func (f Foo) baz() { // unused + println("baz") + } + func main() { + Foo{}.Bar() + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + sel := declSelection(t, srcFiles, nil) + + sel.IsAlive(`type:command-line-arguments.Foo`) + sel.IsAlive(`func:command-line-arguments.Foo.Bar`) + + sel.IsDead(`func:command-line-arguments.Foo.baz`) +} + +func TestDeclSelection_KeepUnusedUnexportedMethodForInterface(t *testing.T) { + src := ` + package main + type Foo struct {} + func (f Foo) Bar() { + println("foo") + } + func (f Foo) baz() {} // unused + + type Foo2 struct {} + func (f Foo2) Bar() { + println("foo2") + } + + type IFoo interface { + Bar() + baz() + } + func main() { + fs := []any{ Foo{}, Foo2{} } + for _, f := range fs { + if i, ok := f.(IFoo); ok { + i.Bar() + } + } + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + sel := declSelection(t, srcFiles, nil) + + sel.IsAlive(`type:command-line-arguments.Foo`) + sel.IsAlive(`func:command-line-arguments.Foo.Bar`) + + // `baz` signature metadata is used to check a type assertion against IFoo, + // but the method itself is never called, so it can be removed. + // The method is kept in Foo's MethodList for type checking. + sel.IsDead(`func:command-line-arguments.Foo.baz`) +} + +func TestDeclSelection_KeepUnexportedMethodUsedViaInterfaceLit(t *testing.T) { + src := ` + package main + type Foo struct {} + func (f Foo) Bar() { + println("foo") + } + func (f Foo) baz() { + println("baz") + } + func main() { + var f interface { + Bar() + baz() + } = Foo{} + f.baz() + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + sel := declSelection(t, srcFiles, nil) + + sel.IsAlive(`type:command-line-arguments.Foo`) + sel.IsAlive(`func:command-line-arguments.Foo.Bar`) + sel.IsAlive(`func:command-line-arguments.Foo.baz`) +} + +func TestDeclSelection_KeepAliveUnexportedMethodsUsedInMethodExpressions(t *testing.T) { + src := ` + package main + type Foo struct {} + func (f Foo) baz() { + println("baz") + } + func main() { + fb := Foo.baz + fb(Foo{}) + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + sel := declSelection(t, srcFiles, nil) + + sel.IsAlive(`type:command-line-arguments.Foo`) + sel.IsAlive(`func:command-line-arguments.Foo.baz`) +} + +func TestDeclSelection_RemoveUnusedFuncInstance(t *testing.T) { + src := ` + package main + func Sum[T int | float64](values ...T) T { + var sum T + for _, v := range values { + sum += v + } + return sum + } + func Foo() { // unused + println(Sum(1, 2, 3)) + } + func main() { + println(Sum(1.1, 2.2, 3.3)) + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + sel := declSelection(t, srcFiles, nil) + + sel.IsAlive(`func:command-line-arguments.Sum`) + sel.IsAlive(`anonType:command-line-arguments.sliceType$1`) // []float64 + + sel.IsDead(`func:command-line-arguments.Foo`) + sel.IsDead(`anonType:command-line-arguments.sliceType`) // []int + sel.IsDead(`func:command-line-arguments.Sum`) +} + +func TestDeclSelection_RemoveUnusedStructTypeInstances(t *testing.T) { + src := ` + package main + type Foo[T any] struct { v T } + func (f Foo[T]) Bar() { + println(f.v) + } + + var _ = Foo[float64]{v: 3.14} // unused + + func main() { + Foo[int]{v: 7}.Bar() + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + sel := declSelection(t, srcFiles, nil) + + sel.IsAlive(`type:command-line-arguments.Foo`) + sel.IsAlive(`func:command-line-arguments.Foo.Bar`) + + sel.IsDead(`type:command-line-arguments.Foo`) + sel.IsDead(`func:command-line-arguments.Foo.Bar`) +} + +func TestDeclSelection_RemoveUnusedInterfaceTypeInstances(t *testing.T) { + src := ` + package main + type Foo[T any] interface { Bar(v T) } + + type Baz int + func (b Baz) Bar(v int) { + println(v + int(b)) + } + + var F64 = FooBar[float64] // unused + + func FooBar[T any](f Foo[T], v T) { + f.Bar(v) + } + + func main() { + FooBar[int](Baz(42), 12) // Baz implements Foo[int] + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + sel := declSelection(t, srcFiles, nil) + + sel.IsAlive(`type:command-line-arguments.Baz`) + sel.IsAlive(`func:command-line-arguments.Baz.Bar`) + sel.IsDead(`var:command-line-arguments.F64`) + + sel.IsAlive(`func:command-line-arguments.FooBar`) + // The Foo[int] instance is defined as a parameter in FooBar[int] that is alive. + // However, Foo[int] isn't used directly in the code so it can be removed. + // JS will simply duck-type the Baz object to Foo[int] without Foo[int] specifically defined. + sel.IsDead(`type:command-line-arguments.Foo`) + + sel.IsDead(`func:command-line-arguments.FooBar`) + sel.IsDead(`type:command-line-arguments.Foo`) +} + +func TestDeclSelection_RemoveUnusedMethodWithDifferentSignature(t *testing.T) { + src := ` + package main + type Foo struct{} + func (f Foo) Bar() { println("Foo") } + func (f Foo) baz(x int) { println(x) } // unused + + type Foo2 struct{} + func (f Foo2) Bar() { println("Foo2") } + func (f Foo2) baz(x string) { println(x) } + + func main() { + f1 := Foo{} + f1.Bar() + + f2 := Foo2{} + f2.Bar() + f2.baz("foo") + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + sel := declSelection(t, srcFiles, nil) + + sel.IsAlive(`type:command-line-arguments.Foo`) + sel.IsAlive(`func:command-line-arguments.Foo.Bar`) + sel.IsDead(`func:command-line-arguments.Foo.baz`) + + sel.IsAlive(`type:command-line-arguments.Foo2`) + sel.IsAlive(`func:command-line-arguments.Foo2.Bar`) + sel.IsAlive(`func:command-line-arguments.Foo2.baz`) +} + +func TestDeclSelection_RemoveUnusedUnexportedMethodInstance(t *testing.T) { + src := ` + package main + type Foo[T any] struct{} + func (f Foo[T]) Bar() { println("Foo") } + func (f Foo[T]) baz(x T) { Baz[T]{v: x}.Bar() } + + type Baz[T any] struct{ v T } + func (b Baz[T]) Bar() { println("Baz", b.v) } + + func main() { + f1 := Foo[int]{} + f1.Bar() + f1.baz(7) + + f2 := Foo[uint]{} // Foo[uint].baz is unused + f2.Bar() + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + sel := declSelection(t, srcFiles, nil) + + sel.IsAlive(`type:command-line-arguments.Foo`) + sel.IsAlive(`func:command-line-arguments.Foo.Bar`) + sel.IsAlive(`func:command-line-arguments.Foo.baz`) + sel.IsAlive(`type:command-line-arguments.Baz`) + sel.IsAlive(`func:command-line-arguments.Baz.Bar`) + + sel.IsAlive(`type:command-line-arguments.Foo`) + sel.IsAlive(`func:command-line-arguments.Foo.Bar`) + + // All three below are dead because Foo[uint].baz is unused. + sel.IsDead(`func:command-line-arguments.Foo.baz`) + sel.IsDead(`type:command-line-arguments.Baz`) + sel.IsDead(`func:command-line-arguments.Baz.Bar`) +} + +func TestDeclSelection_RemoveUnusedTypeConstraint(t *testing.T) { + src := ` + package main + type Foo interface{ int | string } + + type Bar[T Foo] struct{ v T } + func (b Bar[T]) Baz() { println(b.v) } + + var ghost = Bar[int]{v: 7} // unused + + func main() { + println("do nothing") + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + sel := declSelection(t, srcFiles, nil) + + sel.IsDead(`type:command-line-arguments.Foo`) + sel.IsDead(`type:command-line-arguments.Bar`) + sel.IsDead(`func:command-line-arguments.Bar.Baz`) + sel.IsDead(`var:command-line-arguments.ghost`) +} + +func TestLengthParenthesizingIssue841(t *testing.T) { + // See issue https://github.com/gopherjs/gopherjs/issues/841 + // + // Summary: Given `len(a+b)` where a and b are strings being concatenated + // together, the result was `a + b.length` instead of `(a+b).length`. + // + // The fix was to check if the expression in `len` is a binary + // expression or not. If it is, then the expression is parenthesized. + // This will work for concatenations any combination of variables and + // literals but won't pick up `len(Foo(a+b))` or `len(a[0:i+3])`. + + src := ` + package main + + func main() { + a := "a" + b := "b" + ab := a + b + if len(a+b) != len(ab) { + panic("unreachable") + } + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + root := srctesting.ParseSources(t, srcFiles, nil) + archives := compileProject(t, root, false) + mainPkg := archives[root.PkgPath] + + badRegex := regexp.MustCompile(`a\s*\+\s*b\.length`) + goodRegex := regexp.MustCompile(`\(a\s*\+\s*b\)\.length`) + goodFound := false + for i, decl := range mainPkg.Declarations { + if badRegex.Match(decl.DeclCode) { + t.Errorf("found length issue in decl #%d: %s", i, decl.FullName) + t.Logf("decl code:\n%s", string(decl.DeclCode)) + } + if goodRegex.Match(decl.DeclCode) { + goodFound = true + } + } + if !goodFound { + t.Error("parenthesized length not found") + } +} + +func TestDeclNaming_Import(t *testing.T) { + src1 := ` + package main + + import ( + newt "github.com/gopherjs/gopherjs/compiler/jorden" + "github.com/gopherjs/gopherjs/compiler/burke" + "github.com/gopherjs/gopherjs/compiler/hudson" + ) + + func main() { + newt.Quote() + burke.Quote() + hudson.Quote() + }` + src2 := `package jorden + func Quote() { println("They mostly come at night... mostly") }` + src3 := `package burke + func Quote() { println("Busy little creatures, huh?") }` + src4 := `package hudson + func Quote() { println("Game over, man! Game over!") }` + + root := srctesting.ParseSources(t, + []srctesting.Source{ + {Name: `main.go`, Contents: []byte(src1)}, + }, + []srctesting.Source{ + {Name: `jorden/rebecca.go`, Contents: []byte(src2)}, + {Name: `burke/carter.go`, Contents: []byte(src3)}, + {Name: `hudson/william.go`, Contents: []byte(src4)}, + }) + + archives := compileProject(t, root, false) + checkForDeclFullNames(t, archives, + `import:github.com/gopherjs/gopherjs/compiler/burke`, + `import:github.com/gopherjs/gopherjs/compiler/hudson`, + `import:github.com/gopherjs/gopherjs/compiler/jorden`, + ) +} + +func TestDeclNaming_FuncAndFuncVar(t *testing.T) { + src := ` + package main + + func Avasarala(value int) { println("Chrisjen", value) } + + func Draper[T any](value T) { println("Bobbie", value) } + + type Nagata struct{ value int } + func (n Nagata) Print() { println("Naomi", n.value) } + + type Burton[T any] struct{ value T } + func (b Burton[T]) Print() { println("Amos", b.value) } + + func main() { + Avasarala(10) + Draper(11) + Draper("Babs") + Nagata{value: 12}.Print() + Burton[int]{value: 13}.Print() + Burton[string]{value: "Timothy"}.Print() + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + root := srctesting.ParseSources(t, srcFiles, nil) + archives := compileProject(t, root, false) + checkForDeclFullNames(t, archives, + `funcVar:command-line-arguments.Avasarala`, + `func:command-line-arguments.Avasarala`, + + `funcVar:command-line-arguments.Draper`, + `func:command-line-arguments.Draper`, + `func:command-line-arguments.Draper`, + + `func:command-line-arguments.Nagata.Print`, + + `typeVar:command-line-arguments.Burton`, + `type:command-line-arguments.Burton`, + `type:command-line-arguments.Burton`, + `func:command-line-arguments.Burton.Print`, + `func:command-line-arguments.Burton.Print`, + + `funcVar:command-line-arguments.main`, + `func:command-line-arguments.main`, + `init:main`, + ) +} + +func TestDeclNaming_InitsAndVars(t *testing.T) { + src1 := ` + package main + + import ( + _ "github.com/gopherjs/gopherjs/compiler/spengler" + _ "github.com/gopherjs/gopherjs/compiler/barrett" + _ "github.com/gopherjs/gopherjs/compiler/tully" + ) + + var peck = "Walter" + func init() { println(peck) } + + func main() { + println("Janosz Poha") + }` + src2 := `package spengler + func init() { println("Egon") } + var egie = func() { println("Dirt Farmer") } + func init() { egie() }` + src3 := `package barrett + func init() { println("Dana") }` + src4 := `package barrett + func init() { println("Zuul") }` + src5 := `package barrett + func init() { println("Gatekeeper") }` + src6 := `package tully + func init() { println("Louis") }` + src7 := `package tully + var keymaster = "Vinz Clortho" + func init() { println(keymaster) }` + + root := srctesting.ParseSources(t, + []srctesting.Source{ + {Name: `main.go`, Contents: []byte(src1)}, + }, + []srctesting.Source{ + {Name: `spengler/a.go`, Contents: []byte(src2)}, + {Name: `barrett/a.go`, Contents: []byte(src3)}, + {Name: `barrett/b.go`, Contents: []byte(src4)}, + {Name: `barrett/c.go`, Contents: []byte(src5)}, + {Name: `tully/a.go`, Contents: []byte(src6)}, + {Name: `tully/b.go`, Contents: []byte(src7)}, + }) + + archives := compileProject(t, root, false) + checkForDeclFullNames(t, archives, + // tully + `var:github.com/gopherjs/gopherjs/compiler/tully.keymaster`, + `funcVar:github.com/gopherjs/gopherjs/compiler/tully.init`, + `funcVar:github.com/gopherjs/gopherjs/compiler/tully.init`, + `func:github.com/gopherjs/gopherjs/compiler/tully.init`, + `func:github.com/gopherjs/gopherjs/compiler/tully.init`, + + // spangler + `var:github.com/gopherjs/gopherjs/compiler/spengler.egie`, + `funcVar:github.com/gopherjs/gopherjs/compiler/spengler.init`, + `funcVar:github.com/gopherjs/gopherjs/compiler/spengler.init`, + `func:github.com/gopherjs/gopherjs/compiler/spengler.init`, + `func:github.com/gopherjs/gopherjs/compiler/spengler.init`, + + // barrett + `funcVar:github.com/gopherjs/gopherjs/compiler/barrett.init`, + `funcVar:github.com/gopherjs/gopherjs/compiler/barrett.init`, + `funcVar:github.com/gopherjs/gopherjs/compiler/barrett.init`, + `func:github.com/gopherjs/gopherjs/compiler/barrett.init`, + `func:github.com/gopherjs/gopherjs/compiler/barrett.init`, + `func:github.com/gopherjs/gopherjs/compiler/barrett.init`, + + // main + `var:command-line-arguments.peck`, + `funcVar:command-line-arguments.init`, + `func:command-line-arguments.init`, + `funcVar:command-line-arguments.main`, + `func:command-line-arguments.main`, + `init:main`, + ) +} + +func TestDeclNaming_VarsAndTypes(t *testing.T) { + src := ` + package main + + var _, shawn, _ = func() (int, string, float64) { + return 1, "Vizzini", 3.14 + }() + + var _ = func() string { + return "Inigo Montoya" + }() + + var fezzik = struct{ value int }{value: 7} + var inigo = struct{ value string }{value: "Montoya"} + + type westley struct{ value string } + + func main() {}` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + root := srctesting.ParseSources(t, srcFiles, nil) + + archives := compileProject(t, root, false) + checkForDeclFullNames(t, archives, + `var:command-line-arguments.shawn`, + `var:blank`, + + `var:command-line-arguments.fezzik`, + `anonType:command-line-arguments.structType`, + + `var:command-line-arguments.inigo`, + `anonType:command-line-arguments.structType$1`, + + `typeVar:command-line-arguments.westley`, + `type:command-line-arguments.westley`, + ) +} + +func Test_CrossPackageAnalysis(t *testing.T) { + src1 := ` + package main + import "github.com/gopherjs/gopherjs/compiler/stable" + + func main() { + m := map[string]int{ + "one": 1, + "two": 2, + "three": 3, + } + stable.Print(m) + }` + src2 := ` + package collections + import "github.com/gopherjs/gopherjs/compiler/cmp" + + func Keys[K cmp.Ordered, V any, M ~map[K]V](m M) []K { + keys := make([]K, 0, len(m)) + for k := range m { + keys = append(keys, k) + } + return keys + }` + src3 := ` + package collections + import "github.com/gopherjs/gopherjs/compiler/cmp" + + func Values[K cmp.Ordered, V any, M ~map[K]V](m M) []V { + values := make([]V, 0, len(m)) + for _, v := range m { + values = append(values, v) + } + return values + }` + src4 := ` + package sorts + import "github.com/gopherjs/gopherjs/compiler/cmp" + + func Pair[K cmp.Ordered, V any, SK ~[]K, SV ~[]V](k SK, v SV) { + Bubble(len(k), + func(i, j int) bool { return k[i] < k[j] }, + func(i, j int) { k[i], v[i], k[j], v[j] = k[j], v[j], k[i], v[i] }) + } + + func Bubble(length int, less func(i, j int) bool, swap func(i, j int)) { + for i := 0; i < length; i++ { + for j := i + 1; j < length; j++ { + if less(j, i) { + swap(i, j) + } + } + } + }` + src5 := ` + package stable + import ( + "github.com/gopherjs/gopherjs/compiler/collections" + "github.com/gopherjs/gopherjs/compiler/sorts" + "github.com/gopherjs/gopherjs/compiler/cmp" + ) + + func Print[K cmp.Ordered, V any, M ~map[K]V](m M) { + keys := collections.Keys(m) + values := collections.Values(m) + sorts.Pair(keys, values) + for i, k := range keys { + println(i, k, values[i]) + } + }` + src6 := ` + package cmp + type Ordered interface { ~int | ~uint | ~float64 | ~string }` + + root := srctesting.ParseSources(t, + []srctesting.Source{ + {Name: `main.go`, Contents: []byte(src1)}, + }, + []srctesting.Source{ + {Name: `collections/keys.go`, Contents: []byte(src2)}, + {Name: `collections/values.go`, Contents: []byte(src3)}, + {Name: `sorts/sorts.go`, Contents: []byte(src4)}, + {Name: `stable/print.go`, Contents: []byte(src5)}, + {Name: `cmp/ordered.go`, Contents: []byte(src6)}, + }) + + archives := compileProject(t, root, false) + checkForDeclFullNames(t, archives, + // collections + `funcVar:github.com/gopherjs/gopherjs/compiler/collections.Values`, + `func:github.com/gopherjs/gopherjs/compiler/collections.Values`, + `funcVar:github.com/gopherjs/gopherjs/compiler/collections.Keys`, + `func:github.com/gopherjs/gopherjs/compiler/collections.Keys`, + + // sorts + `funcVar:github.com/gopherjs/gopherjs/compiler/sorts.Pair`, + `func:github.com/gopherjs/gopherjs/compiler/sorts.Pair`, + `funcVar:github.com/gopherjs/gopherjs/compiler/sorts.Bubble`, + `func:github.com/gopherjs/gopherjs/compiler/sorts.Bubble`, + + // stable + `funcVar:github.com/gopherjs/gopherjs/compiler/stable.Print`, + `func:github.com/gopherjs/gopherjs/compiler/stable.Print`, + + // main + `init:main`, + ) +} + +func TestArchiveSelectionAfterSerialization(t *testing.T) { + src := ` + package main + type Foo interface{ int | string } + + type Bar[T Foo] struct{ v T } + func (b Bar[T]) Baz() { println(b.v) } + + var ghost = Bar[int]{v: 7} // unused + + func main() { + println("do nothing") + }` + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + root := srctesting.ParseSources(t, srcFiles, nil) + rootPath := root.PkgPath + origArchives := compileProject(t, root, false) + readArchives := reloadCompiledProject(t, origArchives, rootPath) + + origJS := renderPackage(t, origArchives[rootPath], false) + readJS := renderPackage(t, readArchives[rootPath], false) + + if diff := cmp.Diff(origJS, readJS); diff != "" { + t.Errorf("the reloaded files produce different JS:\n%s", diff) + } +} + +func TestNestedConcreteTypeInGenericFunc(t *testing.T) { + // This is a test of a type defined inside a generic function + // that uses the type parameter of the function as a field type. + // The `T` type is unique for each instance of `F`. + // The use of `A` as a field is do demonstrate the difference in the types + // however even if T had no fields, the type would still be different. + // + // Change `print(F[?]())` to `fmt.Printf("%T\n", F[?]())` for + // golang playground to print the type of T in the different F instances. + // (I just didn't want this test to depend on `fmt` when it doesn't need to.) + + src := ` + package main + func F[A any]() any { + type T struct{ + a A + } + return T{} + } + func main() { + type Int int + print(F[int]()) + print(F[Int]()) + } + ` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + root := srctesting.ParseSources(t, srcFiles, nil) + archives := compileProject(t, root, false) + mainPkg := archives[root.PkgPath] + insts := collectDeclInstances(t, mainPkg) + + exp := []string{ + `F[int]`, + `F[main.Int]`, // Go prints `F[main.Int·2]` + `T[int;]`, // `T` from `F[int]` (Go prints `T[int]`) + `T[main.Int;]`, // `T` from `F[main.Int]` (Go prints `T[main.Int·2]`) + } + if diff := cmp.Diff(exp, insts); len(diff) > 0 { + t.Errorf("the instances of generics are different:\n%s", diff) + } +} + +func TestNestedGenericTypeInGenericFunc(t *testing.T) { + // This is a subset of the type param nested test from the go repo. + // See https://github.com/golang/go/blob/go1.19.13/test/typeparam/nested.go + // The test is failing because nested types aren't being typed differently. + // For example the type of `T[int]` below is different based on `F[X]` + // instance for different `X` type parameters, hence Go prints the type as + // `T[X;int]` instead of `T[int]`. + + src := ` + package main + func F[A any]() any { + type T[B any] struct{ + a A + b B + } + return T[int]{} + } + func main() { + type Int int + print(F[int]()) + print(F[Int]()) + } + ` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + root := srctesting.ParseSources(t, srcFiles, nil) + archives := compileProject(t, root, false) + mainPkg := archives[root.PkgPath] + insts := collectDeclInstances(t, mainPkg) + + exp := []string{ + `F[int]`, + `F[main.Int]`, + `T[int; int]`, + `T[main.Int; int]`, + } + if diff := cmp.Diff(exp, insts); len(diff) > 0 { + t.Errorf("the instances of generics are different:\n%s", diff) + } +} + +func TestNestedGenericTypeInGenericFuncWithSharedTArgs(t *testing.T) { + src := ` + package main + func F[A any]() any { + type T[B any] struct { + b B + } + return T[A]{} + } + func main() { + type Int int + print(F[int]()) + print(F[Int]()) + }` + + srcFiles := []srctesting.Source{{Name: `main.go`, Contents: []byte(src)}} + root := srctesting.ParseSources(t, srcFiles, nil) + archives := compileProject(t, root, false) + mainPkg := archives[root.PkgPath] + insts := collectDeclInstances(t, mainPkg) + + exp := []string{ + `F[int]`, + `F[main.Int]`, + `T[int; int]`, + `T[main.Int; main.Int]`, + // Make sure that T[int;main.Int] and T[main.Int;int] aren't created. + } + if diff := cmp.Diff(exp, insts); len(diff) > 0 { + t.Errorf("the instances of generics are different:\n%s", diff) + } +} + +func collectDeclInstances(t *testing.T, pkg *Archive) []string { + t.Helper() + + // Regex to match strings like `Foo[42 /* bar */] =` and capture + // the name (`Foo`), the index (`42`), and the instance type (`bar`). + rex := regexp.MustCompile(`^\s*(\w+)\s*\[\s*(\d+)\s*\/\*(.+)\*\/\s*\]\s*\=`) + + // Collect all instances of generics (e.g. `Foo[bar] @ 2`) written to the decl code. + insts := []string{} + for _, decl := range pkg.Declarations { + if match := rex.FindAllStringSubmatch(string(decl.DeclCode), 1); len(match) > 0 { + instance := match[0][1] + `[` + strings.TrimSpace(match[0][3]) + `]` + instance = strings.ReplaceAll(instance, `command-line-arguments`, pkg.Name) + insts = append(insts, instance) + } + } + sort.Strings(insts) + return insts +} + +func compareOrder(t *testing.T, sourceFiles []srctesting.Source, minify bool) { + t.Helper() + outputNormal := compile(t, sourceFiles, minify) + + // reverse the array + for i, j := 0, len(sourceFiles)-1; i < j; i, j = i+1, j-1 { + sourceFiles[i], sourceFiles[j] = sourceFiles[j], sourceFiles[i] + } + + outputReversed := compile(t, sourceFiles, minify) + + if diff := cmp.Diff(outputNormal, outputReversed); diff != "" { + t.Errorf("files in different order produce different JS:\n%s", diff) + } +} + +func compile(t *testing.T, sourceFiles []srctesting.Source, minify bool) string { + t.Helper() + rootPkg := srctesting.ParseSources(t, sourceFiles, nil) + archives := compileProject(t, rootPkg, minify) + + path := rootPkg.PkgPath + a, ok := archives[path] + if !ok { + t.Fatalf(`root package not found in archives: %s`, path) + } + + return renderPackage(t, a, minify) +} + +// compileProject compiles the given root package and all packages imported by the root. +// This returns the compiled archives of all packages keyed by their import path. +func compileProject(t *testing.T, root *packages.Package, minify bool) map[string]*Archive { + t.Helper() + pkgMap := map[string]*packages.Package{} + packages.Visit([]*packages.Package{root}, nil, func(pkg *packages.Package) { + pkgMap[pkg.PkgPath] = pkg + }) + + allSrcs := map[string]*sources.Sources{} + for _, pkg := range pkgMap { + srcs := &sources.Sources{ + ImportPath: pkg.PkgPath, + Dir: ``, + Files: pkg.Syntax, + FileSet: pkg.Fset, + } + allSrcs[pkg.PkgPath] = srcs + } + + importer := func(path, srcDir string) (*sources.Sources, error) { + srcs, ok := allSrcs[path] + if !ok { + t.Fatal(`package not found:`, path) + return nil, nil + } + return srcs, nil + } + + tContext := types.NewContext() + sortedSources := make([]*sources.Sources, 0, len(allSrcs)) + for _, srcs := range allSrcs { + sortedSources = append(sortedSources, srcs) + } + sources.SortedSourcesSlice(sortedSources) + PrepareAllSources(sortedSources, importer, tContext) + + archives := map[string]*Archive{} + for _, srcs := range allSrcs { + a, err := Compile(srcs, tContext, minify) + if err != nil { + t.Fatal(`failed to compile:`, err) + } + archives[srcs.ImportPath] = a + } + return archives +} + +// newTime creates an arbitrary time.Time offset by the given number of seconds. +// This is useful for quickly creating times that are before or after another. +func newTime(seconds float64) time.Time { + return time.Date(1969, 7, 20, 20, 17, 0, 0, time.UTC). + Add(time.Duration(seconds * float64(time.Second))) +} + +// reloadCompiledProject persists the given archives into memory then reloads +// them from memory to simulate a cache reload of a precompiled project. +func reloadCompiledProject(t *testing.T, archives map[string]*Archive, rootPkgPath string) map[string]*Archive { + t.Helper() + + // TODO(grantnelson-wf): The tests using this function are out-of-date + // since they are testing the old archive caching that has been disabled. + // At some point, these tests should be updated to test any new caching + // mechanism that is implemented or removed. As is this function is faking + // the old recursive archive loading that is no longer used since it + // doesn't allow cross package analysis for generings. + + buildTime := newTime(5.0) + serialized := map[string][]byte{} + for path, a := range archives { + buf := &bytes.Buffer{} + if err := WriteArchive(a, buildTime, buf); err != nil { + t.Fatalf(`failed to write archive for %s: %v`, path, err) + } + serialized[path] = buf.Bytes() + } + + srcModTime := newTime(0.0) + reloadCache := map[string]*Archive{} + type ImportContext struct { + Packages map[string]*types.Package + ImportArchive func(path string) (*Archive, error) + } + var importContext *ImportContext + importContext = &ImportContext{ + Packages: map[string]*types.Package{}, + ImportArchive: func(path string) (*Archive, error) { + // find in local cache + if a, ok := reloadCache[path]; ok { + return a, nil + } + + // deserialize archive + buf, ok := serialized[path] + if !ok { + t.Fatalf(`archive not found for %s`, path) + } + a, _, err := ReadArchive(path, bytes.NewReader(buf), srcModTime, importContext.Packages) + if err != nil { + t.Fatalf(`failed to read archive for %s: %v`, path, err) + } + reloadCache[path] = a + return a, nil + }, + } + + _, err := importContext.ImportArchive(rootPkgPath) + if err != nil { + t.Fatal(`failed to reload archives:`, err) + } + return reloadCache +} + +func renderPackage(t *testing.T, archive *Archive, minify bool) string { + t.Helper() + + sel := &dce.Selector[*Decl]{} + for _, d := range archive.Declarations { + sel.Include(d, false) + } + selection := sel.AliveDecls() + + buf := &bytes.Buffer{} + + if err := WritePkgCode(archive, selection, linkname.GoLinknameSet{}, minify, &SourceMapFilter{Writer: buf}); err != nil { + t.Fatal(err) + } + + b := buf.String() + if len(b) == 0 { + t.Fatal(`render package had no output`) + } + return b +} + +type selectionTester struct { + t *testing.T + mainPkg *Archive + archives map[string]*Archive + packages []*Archive + dceSelection map[*Decl]struct{} +} + +func declSelection(t *testing.T, sourceFiles []srctesting.Source, auxFiles []srctesting.Source) *selectionTester { + t.Helper() + root := srctesting.ParseSources(t, sourceFiles, auxFiles) + archives := compileProject(t, root, false) + mainPkg := archives[root.PkgPath] + + paths := make([]string, 0, len(archives)) + for path := range archives { + paths = append(paths, path) + } + sort.Strings(paths) + packages := make([]*Archive, 0, len(archives)) + for _, path := range paths { + packages = append(packages, archives[path]) + } + + sel := &dce.Selector[*Decl]{} + for _, pkg := range packages { + for _, d := range pkg.Declarations { + sel.Include(d, false) + } + } + dceSelection := sel.AliveDecls() + + return &selectionTester{ + t: t, + mainPkg: mainPkg, + archives: archives, + packages: packages, + dceSelection: dceSelection, + } +} + +func (st *selectionTester) PrintDeclStatus() { + st.t.Helper() + for _, pkg := range st.packages { + st.t.Logf(`Package %s`, pkg.ImportPath) + for _, decl := range pkg.Declarations { + if _, ok := st.dceSelection[decl]; ok { + st.t.Logf(` [Alive] %q`, decl.FullName) + } else { + st.t.Logf(` [Dead] %q`, decl.FullName) + } + } + } +} + +func (st *selectionTester) IsAlive(declFullName string) { + st.t.Helper() + decl := st.FindDecl(declFullName) + if _, ok := st.dceSelection[decl]; !ok { + st.t.Error(`expected the decl to be alive:`, declFullName) + } +} + +func (st *selectionTester) IsDead(declFullName string) { + st.t.Helper() + decl := st.FindDecl(declFullName) + if _, ok := st.dceSelection[decl]; ok { + st.t.Error(`expected the decl to be dead:`, declFullName) + } +} + +func (st *selectionTester) FindDecl(declFullName string) *Decl { + st.t.Helper() + var found *Decl + for _, pkg := range st.packages { + for _, d := range pkg.Declarations { + if d.FullName == declFullName { + if found != nil { + st.t.Fatal(`multiple decls found with the name`, declFullName) + } + found = d + } + } + } + if found == nil { + st.t.Fatal(`no decl found by the name`, declFullName) + } + return found +} + +func checkForDeclFullNames(t *testing.T, archives map[string]*Archive, expectedFullNames ...string) { + t.Helper() + + expected := map[string]int{} + counts := map[string]int{} + for _, name := range expectedFullNames { + expected[name]++ + counts[name]++ + } + for _, pkg := range archives { + for _, decl := range pkg.Declarations { + if found, has := expected[decl.FullName]; has { + if found <= 0 { + t.Errorf(`decl name existed more than %d time(s): %q`, counts[decl.FullName], decl.FullName) + } else { + expected[decl.FullName]-- + } + } + } + } + for imp, found := range expected { + if found > 0 { + t.Errorf(`missing %d decl name(s): %q`, found, imp) + } + } + if t.Failed() { + t.Log("Declarations:") + for pkgName, pkg := range archives { + t.Logf("\t%q", pkgName) + for i, decl := range pkg.Declarations { + t.Logf("\t\t%d:\t%q", i, decl.FullName) + } + } + } +} diff --git a/compiler/declNames.go b/compiler/declNames.go new file mode 100644 index 000000000..4ba59e289 --- /dev/null +++ b/compiler/declNames.go @@ -0,0 +1,70 @@ +package compiler + +import ( + "go/types" + + "github.com/gopherjs/gopherjs/compiler/internal/symbol" + "github.com/gopherjs/gopherjs/compiler/internal/typeparams" +) + +// importDeclFullName returns a unique name for an import declaration. +// This import name may be duplicated in different packages if they both +// import the same package, they are only unique per package. +func importDeclFullName(importedPkg *types.Package) string { + return `import:` + importedPkg.Path() +} + +// varDeclFullName returns a name for a package-level variable declaration. +// This var name only references the first named variable in an assignment. +// If no variables are named, the name is `var:blank` and not unique. +func varDeclFullName(init *types.Initializer) string { + for _, lhs := range init.Lhs { + if lhs.Name() != `_` { + return `var:` + symbol.New(lhs).String() + } + } + return `var:blank` +} + +// funcVarDeclFullName returns a name for a package-level variable +// that is used for a function (without a receiver) declaration. +// The name is unique unless the function is an `init` function. +// If the function is generic, this declaration name is also for the list +// of instantiations of the function. +func funcVarDeclFullName(o *types.Func) string { + return `funcVar:` + symbol.New(o).String() +} + +// mainFuncFullName returns the name for the declaration used to invoke the +// main function of the program. There should only be one decl with this name. +func mainFuncDeclFullName() string { + return `init:main` +} + +// funcDeclFullName returns a name for a package-level function +// declaration for the given instance of a function. +// The name is unique unless the function is an `init` function. +func funcDeclFullName(inst typeparams.Instance) string { + return `func:` + inst.String() +} + +// typeVarDeclFullName returns a unique name for a package-level variable +// that is used for a named type declaration. +// If the type is generic, this declaration name is also for the list +// of instantiations of the type. +func typeVarDeclFullName(o *types.TypeName) string { + return `typeVar:` + symbol.New(o).String() +} + +// typeDeclFullName returns a unique name for a package-level type declaration +// for the given instance of a type. Names are only unique per package. +func typeDeclFullName(inst typeparams.Instance) string { + return `type:` + inst.String() +} + +// anonTypeDeclFullName returns a unique name for a package-level type +// declaration for an anonymous type. Names are only unique per package. +// These names are generated for types that are not named in the source code. +func anonTypeDeclFullName(o types.Object) string { + return `anonType:` + symbol.New(o).String() +} diff --git a/compiler/decls.go b/compiler/decls.go new file mode 100644 index 000000000..eb95cd2f7 --- /dev/null +++ b/compiler/decls.go @@ -0,0 +1,614 @@ +package compiler + +// decls.go contains logic responsible for compiling top-level declarations, +// such as imports, types, functions, etc. + +import ( + "fmt" + "go/ast" + "go/constant" + "go/token" + "go/types" + "sort" + "strings" + + "github.com/gopherjs/gopherjs/compiler/internal/analysis" + "github.com/gopherjs/gopherjs/compiler/internal/dce" + "github.com/gopherjs/gopherjs/compiler/internal/symbol" + "github.com/gopherjs/gopherjs/compiler/internal/typeparams" + "github.com/gopherjs/gopherjs/compiler/sources" + "github.com/gopherjs/gopherjs/compiler/typesutil" +) + +// Decl represents a package-level symbol (e.g. a function, variable or type). +// +// It contains code generated by the compiler for this specific symbol, which is +// grouped by the execution stage it belongs to in the JavaScript runtime. +// +// When adding new fields to this struct, make sure the field is exported +// so that it Gob serializes correctly for the archive cache. +type Decl struct { + // The package- or receiver-type-qualified name of function or method obj. + // See go/types.Func.FullName(). + FullName string + // A logical equivalent of a symbol name in an object file in the traditional + // Go compiler/linker toolchain. Used by GopherJS to support go:linkname + // directives. Must be set for decls that are supported by go:linkname + // implementation. + LinkingName symbol.Name + // A list of package-level JavaScript variable names this symbol needs to declare. + Vars []string + // A JS expression by which the object represented by this decl may be + // referenced within the package context. Empty if the decl represents no such + // object. + RefExpr string + // NamedRecvType is method named recv declare. + NamedRecvType string + // JavaScript code that declares basic information about a symbol. For a type + // it configures basic information about the type and its identity. For a function + // or method it contains its compiled body. + DeclCode []byte + // JavaScript code that initializes reflection metadata about type's method list. + MethodListCode []byte + // JavaScript code that initializes the rest of reflection metadata about a type + // (e.g. struct fields, array type sizes, element types, etc.). + TypeInitCode []byte + // JavaScript code that needs to be executed during the package init phase to + // set the symbol up (e.g. initialize package-level variable value). + InitCode []byte + // DCEInfo stores the information for dead-code elimination. + DCEInfo dce.Info + // Set to true if a function performs a blocking operation (I/O or + // synchronization). The compiler will have to generate function code such + // that it can be resumed after a blocking operation completes without + // blocking the main thread in the meantime. + Blocking bool +} + +// minify returns a copy of Decl with unnecessary whitespace removed from the +// JS code. +func (d Decl) minify() Decl { + d.DeclCode = removeWhitespace(d.DeclCode, true) + d.MethodListCode = removeWhitespace(d.MethodListCode, true) + d.TypeInitCode = removeWhitespace(d.TypeInitCode, true) + d.InitCode = removeWhitespace(d.InitCode, true) + return d +} + +// Dce gets the information for dead-code elimination. +func (d *Decl) Dce() *dce.Info { + return &d.DCEInfo +} + +// topLevelObjects extracts package-level variables, functions and named types +// from the package AST. +func (fc *funcContext) topLevelObjects(srcs *sources.Sources) (vars []*types.Var, functions []*ast.FuncDecl, typeNames typesutil.TypeNames) { + if !fc.isRoot() { + panic(bailout(fmt.Errorf("functionContext.discoverObjects() must be only called on the package-level context"))) + } + + for _, file := range srcs.Files { + for _, decl := range file.Decls { + switch d := decl.(type) { + case *ast.FuncDecl: + sig := fc.pkgCtx.Defs[d.Name].(*types.Func).Type().(*types.Signature) + if sig.Recv() == nil { + fc.objectName(fc.pkgCtx.Defs[d.Name]) // register toplevel name + } + if !isBlank(d.Name) { + functions = append(functions, d) + } + case *ast.GenDecl: + switch d.Tok { + case token.TYPE: + for _, spec := range d.Specs { + o := fc.pkgCtx.Defs[spec.(*ast.TypeSpec).Name].(*types.TypeName) + typeNames.Add(o) + fc.objectName(o) // register toplevel name + } + case token.VAR: + for _, spec := range d.Specs { + for _, name := range spec.(*ast.ValueSpec).Names { + if !isBlank(name) { + o := fc.pkgCtx.Defs[name].(*types.Var) + vars = append(vars, o) + fc.objectName(o) // register toplevel name + } + } + } + case token.CONST: + // skip, constants are inlined + } + } + } + } + + return vars, functions, typeNames +} + +// importDecls processes import declarations. +// +// For each imported package: +// - A new package-level variable is reserved to refer to symbols from that +// package. +// - A Decl instance is generated to be included in the Archive. +// +// Lists of imported package paths and corresponding Decls is returned to the caller. +func (fc *funcContext) importDecls() (importedPaths []string, importDecls []*Decl) { + if !fc.isRoot() { + panic(bailout(fmt.Errorf("functionContext.importDecls() must be only called on the package-level context"))) + } + + imports := []*types.Package{} + for _, pkg := range fc.pkgCtx.Pkg.Imports() { + if pkg == types.Unsafe { + // Prior to Go 1.9, unsafe import was excluded by Imports() method, + // but now we do it here to maintain previous behavior. + continue + } + imports = append(imports, pkg) + } + + // Deterministic processing order. + sort.Slice(imports, func(i, j int) bool { return imports[i].Path() < imports[j].Path() }) + + for _, pkg := range imports { + importedPaths = append(importedPaths, pkg.Path()) + importDecls = append(importDecls, fc.newImportDecl(pkg)) + } + + return importedPaths, importDecls +} + +// newImportDecl registers the imported package and returns a Decl instance for it. +func (fc *funcContext) newImportDecl(importedPkg *types.Package) *Decl { + pkgVar := fc.importedPkgVar(importedPkg) + d := &Decl{ + FullName: importDeclFullName(importedPkg), + Vars: []string{pkgVar}, + DeclCode: []byte(fmt.Sprintf("\t%s = $packages[\"%s\"];\n", pkgVar, importedPkg.Path())), + InitCode: fc.CatchOutput(1, func() { fc.translateStmt(fc.importInitializer(importedPkg.Path()), nil) }), + } + d.Dce().SetAsAlive() + return d +} + +// importInitializer calls the imported package $init() function to ensure it is +// initialized before any code in the importer package runs. +func (fc *funcContext) importInitializer(impPath string) ast.Stmt { + pkgVar := fc.pkgCtx.pkgVars[impPath] + id := fc.newIdent(fmt.Sprintf(`%s.$init`, pkgVar), types.NewSignatureType(nil, nil, nil, nil, nil, false)) + call := &ast.CallExpr{Fun: id} + fc.Blocking[call] = true + fc.Flattened[call] = true + + return &ast.ExprStmt{X: call} +} + +// varDecls translates all package-level variables. +// +// `vars` argument must contain all package-level variables found in the package. +// The method returns corresponding Decls that declare and initialize the vars +// as appropriate. Decls are returned in order necessary to correctly initialize +// the variables, considering possible dependencies between them. +func (fc *funcContext) varDecls(vars []*types.Var) []*Decl { + if !fc.isRoot() { + panic(bailout(fmt.Errorf("functionContext.varDecls() must be only called on the package-level context"))) + } + + var varDecls []*Decl + varsWithInit := fc.pkgCtx.VarsWithInitializers() + + initializers := []*types.Initializer{} + + // For implicitly-initialized vars we generate synthetic zero-value + // initializers and then process them the same way as explicitly initialized. + for _, o := range vars { + if varsWithInit[o] { + continue + } + initializer := &types.Initializer{ + Lhs: []*types.Var{o}, + Rhs: fc.zeroValue(o.Type()), + } + initializers = append(initializers, initializer) + } + + // Add explicitly-initialized variables to the list. Implicitly-initialized + // variables should be declared first in case explicit initializers depend on + // them. + initializers = append(initializers, fc.pkgCtx.InitOrder...) + + for _, init := range initializers { + varDecls = append(varDecls, fc.newVarDecl(init)) + } + + return varDecls +} + +// newVarDecl creates a new Decl describing a variable, given an explicit +// initializer. +func (fc *funcContext) newVarDecl(init *types.Initializer) *Decl { + d := &Decl{ + FullName: varDeclFullName(init), + } + + assignLHS := []ast.Expr{} + for _, o := range init.Lhs { + assignLHS = append(assignLHS, fc.newIdentFor(o)) + + // For non-exported package-level variables we need to declared a local JS + // variable. Exported variables are represented as properties of the $pkg + // JS object. + if !o.Exported() { + d.Vars = append(d.Vars, fc.objectName(o)) + } + if fc.pkgCtx.HasPointer[o] && !o.Exported() { + d.Vars = append(d.Vars, fc.varPtrName(o)) + } + } + + fc.pkgCtx.CollectDCEDeps(d, func() { + fc.localVars = nil + d.InitCode = fc.CatchOutput(1, func() { + fc.translateStmt(&ast.AssignStmt{ + Lhs: assignLHS, + Tok: token.DEFINE, + Rhs: []ast.Expr{init.Rhs}, + }, nil) + }) + + // Initializer code may have introduced auxiliary variables (e.g. for + // handling multi-assignment or blocking calls), add them to the decl too. + d.Vars = append(d.Vars, fc.localVars...) + fc.localVars = nil // Clean up after ourselves. + }) + + d.Dce().SetName(init.Lhs[0]) + if len(init.Lhs) != 1 || analysis.HasSideEffect(init.Rhs, fc.pkgCtx.Info.Info) { + d.Dce().SetAsAlive() + } + return d +} + +// funcDecls translates all package-level function and methods. +// +// `functions` must contain all package-level function and method declarations +// found in the AST. The function returns Decls that define corresponding JS +// functions at runtime. For special functions like init() and main() decls will +// also contain code necessary to invoke them. +func (fc *funcContext) funcDecls(functions []*ast.FuncDecl) ([]*Decl, error) { + var funcDecls []*Decl + var mainFunc *types.Func + for _, fun := range functions { + o := fc.pkgCtx.Defs[fun.Name].(*types.Func) + + if fun.Recv == nil { + // Auxiliary decl shared by all instances of the function that defines + // package-level variable by which they all are referenced. + objName := fc.objectName(o) + varDecl := &Decl{ + FullName: funcVarDeclFullName(o), + Vars: []string{objName}, + } + varDecl.Dce().SetName(o) + if o.Type().(*types.Signature).TypeParams().Len() != 0 { + varDecl.DeclCode = fc.CatchOutput(0, func() { + fc.Printf("%s = {};", objName) + }) + } + funcDecls = append(funcDecls, varDecl) + } + + for _, inst := range fc.knownInstances(o) { + funcDecls = append(funcDecls, fc.newFuncDecl(fun, inst)) + + if o.Name() == "main" { + mainFunc = o // main() function candidate. + } + } + } + if fc.pkgCtx.isMain() { + if mainFunc == nil { + return nil, fmt.Errorf("missing main function") + } + // Add a special Decl for invoking main() function after the program has + // been initialized. It must come after all other functions, especially all + // init() functions, otherwise main() will be invoked too early. + funcDecls = append(funcDecls, &Decl{ + FullName: mainFuncDeclFullName(), + InitCode: fc.CatchOutput(1, func() { fc.translateStmt(fc.callMainFunc(mainFunc), nil) }), + }) + } + return funcDecls, nil +} + +// newFuncDecl returns a Decl that defines a package-level function or a method. +func (fc *funcContext) newFuncDecl(fun *ast.FuncDecl, inst typeparams.Instance) *Decl { + o := fc.pkgCtx.Defs[fun.Name].(*types.Func) + d := &Decl{ + FullName: funcDeclFullName(inst), + Blocking: fc.pkgCtx.IsBlocking(inst), + LinkingName: symbol.New(o), + } + d.Dce().SetName(o, inst.TArgs...) + + if typesutil.IsMethod(o) { + recv := typesutil.RecvType(o.Type().(*types.Signature)).Obj() + d.NamedRecvType = fc.objectName(recv) + } else { + d.RefExpr = fc.instName(inst) + switch o.Name() { + case "main": + if fc.pkgCtx.isMain() { // Found main() function of the program. + d.Dce().SetAsAlive() // Always reachable. + } + case "init": + d.InitCode = fc.CatchOutput(1, func() { fc.translateStmt(fc.callInitFunc(o), nil) }) + d.Dce().SetAsAlive() // init() function is always reachable. + } + } + + fc.pkgCtx.CollectDCEDeps(d, func() { + d.DeclCode = fc.namedFuncContext(inst).translateTopLevelFunction(fun) + }) + return d +} + +// callInitFunc returns an AST statement for calling the given instance of the +// package's init() function. +func (fc *funcContext) callInitFunc(init *types.Func) ast.Stmt { + id := fc.newIdentFor(init) + call := &ast.CallExpr{Fun: id} + if fc.pkgCtx.IsBlocking(typeparams.Instance{Object: init}) { + fc.Blocking[call] = true + } + return &ast.ExprStmt{X: call} +} + +// callMainFunc returns an AST statement for calling the main() function of the +// program, which should be included in the $init() function of the main package. +func (fc *funcContext) callMainFunc(main *types.Func) ast.Stmt { + id := fc.newIdentFor(main) + call := &ast.CallExpr{Fun: id} + ifStmt := &ast.IfStmt{ + Cond: fc.newIdent("$pkg === $mainPkg", types.Typ[types.Bool]), + Body: &ast.BlockStmt{ + List: []ast.Stmt{ + &ast.ExprStmt{X: call}, + &ast.AssignStmt{ + Lhs: []ast.Expr{fc.newIdent("$mainFinished", types.Typ[types.Bool])}, + Tok: token.ASSIGN, + Rhs: []ast.Expr{fc.newConst(types.Typ[types.Bool], constant.MakeBool(true))}, + }, + }, + }, + } + if fc.pkgCtx.IsBlocking(typeparams.Instance{Object: main}) { + fc.Blocking[call] = true + fc.Flattened[ifStmt] = true + } + + return ifStmt +} + +// namedTypeDecls returns Decls that define all names Go types. +// +// `typeNames` must contain all named types defined in the package, including +// those defined inside function bodies. +func (fc *funcContext) namedTypeDecls(typeNames typesutil.TypeNames) ([]*Decl, error) { + if !fc.isRoot() { + panic(bailout(fmt.Errorf("functionContext.namedTypeDecls() must be only called on the package-level context"))) + } + + var typeDecls []*Decl + for _, o := range typeNames.Slice() { + if o.IsAlias() { + continue + } + + typeDecls = append(typeDecls, fc.newNamedTypeVarDecl(o)) + + for _, inst := range fc.knownInstances(o) { + d, err := fc.newNamedTypeInstDecl(inst) + if err != nil { + return nil, err + } + typeDecls = append(typeDecls, d) + } + } + + return typeDecls, nil +} + +// newNamedTypeVarDecl returns a Decl that defines a JS variable to store named +// type definition. +// +// For generic types, the variable is an object containing known instantiations +// of the type, keyed by the type argument combination. Otherwise it contains +// the type definition directly. +func (fc *funcContext) newNamedTypeVarDecl(obj *types.TypeName) *Decl { + name := fc.objectName(obj) + varDecl := &Decl{ + FullName: typeVarDeclFullName(obj), + Vars: []string{name}, + } + if fc.pkgCtx.instanceSet.Pkg(obj.Pkg()).ObjHasInstances(obj) { + varDecl.DeclCode = fc.CatchOutput(0, func() { + fc.Printf("%s = {};", name) + }) + } + if isPkgLevel(obj) { + varDecl.TypeInitCode = fc.CatchOutput(0, func() { + fc.Printf("$pkg.%s = %s;", encodeIdent(obj.Name()), name) + }) + } + return varDecl +} + +// newNamedTypeInstDecl returns a Decl that represents an instantiation of a +// named Go type. +func (fc *funcContext) newNamedTypeInstDecl(inst typeparams.Instance) (*Decl, error) { + originType := inst.Object.Type().(*types.Named) + + var nestResolver *typeparams.Resolver + if len(inst.TNest) > 0 { + fn := typeparams.FindNestingFunc(inst.Object) + tp := typeparams.SignatureTypeParams(fn.Type().(*types.Signature)) + nestResolver = typeparams.NewResolver(fc.pkgCtx.typesCtx, tp, inst.TNest, nil) + } + fc.typeResolver = typeparams.NewResolver(fc.pkgCtx.typesCtx, originType.TypeParams(), inst.TArgs, nestResolver) + defer func() { fc.typeResolver = nil }() + + instanceType := originType + if !inst.IsTrivial() { + if len(inst.TArgs) > 0 { + instantiated, err := types.Instantiate(fc.pkgCtx.typesCtx, originType, inst.TArgs, true) + if err != nil { + return nil, fmt.Errorf("failed to instantiate type %v with args %v: %w", originType, inst.TArgs, err) + } + instanceType = instantiated.(*types.Named) + } + if len(inst.TNest) > 0 { + instantiated := nestResolver.Substitute(instanceType) + instanceType = instantiated.(*types.Named) + } + } + + underlying := instanceType.Underlying() + d := &Decl{ + FullName: typeDeclFullName(inst), + } + d.Dce().SetName(inst.Object, inst.TArgs...) + fc.pkgCtx.CollectDCEDeps(d, func() { + // Code that declares a JS type (i.e. prototype) for each Go type. + d.DeclCode = fc.CatchOutput(0, func() { + size := int64(0) + constructor := "null" + + switch t := underlying.(type) { + case *types.Struct: + constructor = fc.structConstructor(t) + case *types.Basic, *types.Array, *types.Slice, *types.Chan, *types.Signature, *types.Interface, *types.Pointer, *types.Map: + size = sizes32.Sizeof(t) + } + if tPointer, ok := underlying.(*types.Pointer); ok { + if _, ok := tPointer.Elem().Underlying().(*types.Array); ok { + // Array pointers have non-default constructors to support wrapping + // of the native objects. + constructor = "$arrayPtrCtor()" + } + } + fc.Printf(`%s = $newType(%d, %s, %q, %t, "%s", %t, %s);`, + fc.instName(inst), size, typeKind(originType), inst.TypeString(), inst.Object.Name() != "", inst.Object.Pkg().Path(), inst.Object.Exported(), constructor) + }) + + // Reflection metadata about methods the type has. + d.MethodListCode = fc.CatchOutput(0, func() { + if _, ok := underlying.(*types.Interface); ok { + return + } + var methods []string + var ptrMethods []string + for i := 0; i < instanceType.NumMethods(); i++ { + entry, isPtr := fc.methodListEntry(instanceType.Method(i)) + if isPtr { + ptrMethods = append(ptrMethods, entry) + } else { + methods = append(methods, entry) + } + } + if len(methods) > 0 { + fc.Printf("%s.methods = [%s];", fc.instName(inst), strings.Join(methods, ", ")) + } + if len(ptrMethods) > 0 { + fc.Printf("%s.methods = [%s];", fc.typeName(types.NewPointer(instanceType)), strings.Join(ptrMethods, ", ")) + } + }) + + // Certain types need to run additional type-specific logic to fully + // initialize themselves. + switch t := underlying.(type) { + case *types.Array, *types.Chan, *types.Interface, *types.Map, *types.Pointer, *types.Slice, *types.Signature, *types.Struct: + d.TypeInitCode = fc.CatchOutput(0, func() { + fc.Printf("%s.init(%s);", fc.instName(inst), fc.initArgs(t)) + }) + } + }) + return d, nil +} + +// structConstructor returns JS constructor function for a struct type. +func (fc *funcContext) structConstructor(t *types.Struct) string { + constructor := &strings.Builder{} + + ctrArgs := make([]string, t.NumFields()) + for i := 0; i < t.NumFields(); i++ { + ctrArgs[i] = fieldName(t, i) + "_" + } + + fmt.Fprintf(constructor, "function(%s) {\n", strings.Join(ctrArgs, ", ")) + fmt.Fprintf(constructor, "\t\tthis.$val = this;\n") + + // If no arguments were passed, zero-initialize all fields. + fmt.Fprintf(constructor, "\t\tif (arguments.length === 0) {\n") + for i := 0; i < t.NumFields(); i++ { + zeroValue := fc.zeroValue(fc.fieldType(t, i)) + fmt.Fprintf(constructor, "\t\t\tthis.%s = %s;\n", fieldName(t, i), fc.translateExpr(zeroValue).String()) + } + fmt.Fprintf(constructor, "\t\t\treturn;\n") + fmt.Fprintf(constructor, "\t\t}\n") + + // Otherwise initialize fields with the provided values. + for i := 0; i < t.NumFields(); i++ { + fmt.Fprintf(constructor, "\t\tthis.%[1]s = %[1]s_;\n", fieldName(t, i)) + } + fmt.Fprintf(constructor, "\t}") + return constructor.String() +} + +// methodListEntry returns a JS code fragment that describes the given method +// function for runtime reflection. It returns isPtr=true if the method belongs +// to the pointer-receiver method list. +func (fc *funcContext) methodListEntry(method *types.Func) (entry string, isPtr bool) { + name := method.Name() + if reservedKeywords[name] { + name += "$" + } + pkgPath := "" + if !method.Exported() { + pkgPath = method.Pkg().Path() + } + t := method.Type().(*types.Signature) + entry = fmt.Sprintf(`{prop: "%s", name: %s, pkg: "%s", typ: $funcType(%s)}`, + name, encodeString(method.Name()), pkgPath, fc.initArgs(t)) + _, isPtr = t.Recv().Type().(*types.Pointer) + return entry, isPtr +} + +// anonTypeDecls returns a list of Decls corresponding to anonymous Go types +// encountered in the package. +// +// `anonTypes` must contain an ordered list of anonymous types with the +// identifiers that were auto-assigned to them. They must be sorted in the +// topological initialization order (e.g. `[]int` is before `struct{f []int}`). +// +// See also typesutil.AnonymousTypes. +func (fc *funcContext) anonTypeDecls(anonTypes []*types.TypeName) []*Decl { + if !fc.isRoot() { + panic(bailout(fmt.Errorf("functionContext.anonTypeDecls() must be only called on the package-level context"))) + } + decls := []*Decl{} + for _, t := range anonTypes { + d := &Decl{ + FullName: anonTypeDeclFullName(t), + Vars: []string{t.Name()}, + } + d.Dce().SetName(t) + fc.pkgCtx.CollectDCEDeps(d, func() { + d.DeclCode = []byte(fmt.Sprintf("\t%s = $%sType(%s);\n", t.Name(), strings.ToLower(typeKind(t.Type())[5:]), fc.initArgs(t.Type()))) + }) + decls = append(decls, d) + } + return decls +} diff --git a/compiler/expressions.go b/compiler/expressions.go index 42fe624b6..781a37a3e 100644 --- a/compiler/expressions.go +++ b/compiler/expressions.go @@ -11,8 +11,9 @@ import ( "strconv" "strings" - "github.com/gopherjs/gopherjs/compiler/analysis" "github.com/gopherjs/gopherjs/compiler/astutil" + "github.com/gopherjs/gopherjs/compiler/internal/analysis" + "github.com/gopherjs/gopherjs/compiler/internal/typeparams" "github.com/gopherjs/gopherjs/compiler/typesutil" ) @@ -32,13 +33,13 @@ func (e *expression) StringWithParens() string { return e.str } -func (c *funcContext) translateExpr(expr ast.Expr) *expression { - exprType := c.p.TypeOf(expr) - if value := c.p.Types[expr].Value; value != nil { +func (fc *funcContext) translateExpr(expr ast.Expr) *expression { + exprType := fc.typeOf(expr) + if value := fc.pkgCtx.Types[expr].Value; value != nil { basic := exprType.Underlying().(*types.Basic) switch { case isBoolean(basic): - return c.formatExpr("%s", strconv.FormatBool(constant.BoolVal(value))) + return fc.formatExpr("%s", strconv.FormatBool(constant.BoolVal(value))) case isInteger(basic): if is64Bit(basic) { if basic.Kind() == types.Int64 { @@ -46,71 +47,94 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { if !ok { panic("could not get exact uint") } - return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatInt(d>>32, 10), strconv.FormatUint(uint64(d)&(1<<32-1), 10)) + return fc.formatExpr("new %s(%s, %s)", fc.typeName(exprType), strconv.FormatInt(d>>32, 10), strconv.FormatUint(uint64(d)&(1<<32-1), 10)) } d, ok := constant.Uint64Val(constant.ToInt(value)) if !ok { panic("could not get exact uint") } - return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatUint(d>>32, 10), strconv.FormatUint(d&(1<<32-1), 10)) + return fc.formatExpr("new %s(%s, %s)", fc.typeName(exprType), strconv.FormatUint(d>>32, 10), strconv.FormatUint(d&(1<<32-1), 10)) } d, ok := constant.Int64Val(constant.ToInt(value)) if !ok { panic("could not get exact int") } - return c.formatExpr("%s", strconv.FormatInt(d, 10)) + return fc.formatExpr("%s", strconv.FormatInt(d, 10)) case isFloat(basic): f, _ := constant.Float64Val(value) - return c.formatExpr("%s", strconv.FormatFloat(f, 'g', -1, 64)) + return fc.formatExpr("%s", strconv.FormatFloat(f, 'g', -1, 64)) case isComplex(basic): r, _ := constant.Float64Val(constant.Real(value)) i, _ := constant.Float64Val(constant.Imag(value)) if basic.Kind() == types.UntypedComplex { exprType = types.Typ[types.Complex128] } - return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatFloat(r, 'g', -1, 64), strconv.FormatFloat(i, 'g', -1, 64)) + return fc.formatExpr("new %s(%s, %s)", fc.typeName(exprType), strconv.FormatFloat(r, 'g', -1, 64), strconv.FormatFloat(i, 'g', -1, 64)) case isString(basic): - return c.formatExpr("%s", encodeString(constant.StringVal(value))) + return fc.formatExpr("%s", encodeString(constant.StringVal(value))) default: panic("Unhandled constant type: " + basic.String()) } } - var obj types.Object + var inst typeparams.Instance switch e := expr.(type) { case *ast.SelectorExpr: - obj = c.p.Uses[e.Sel] + inst = fc.instanceOf(e.Sel) case *ast.Ident: - obj = c.p.Defs[e] - if obj == nil { - obj = c.p.Uses[e] - } + inst = fc.instanceOf(e) } - if obj != nil && typesutil.IsJsPackage(obj.Pkg()) { - switch obj.Name() { + if inst.Object != nil && typesutil.IsJsPackage(inst.Object.Pkg()) { + switch inst.Object.Name() { case "Global": - return c.formatExpr("$global") + return fc.formatExpr("$global") case "Module": - return c.formatExpr("$module") + return fc.formatExpr("$module") case "Undefined": - return c.formatExpr("undefined") + return fc.formatExpr("undefined") } } switch e := expr.(type) { case *ast.CompositeLit: - if ptrType, isPointer := exprType.(*types.Pointer); isPointer { - exprType = ptrType.Elem() + if ptrType, isPointer := exprType.Underlying().(*types.Pointer); isPointer { + // Go automatically treats `[]*T{{}}` as `[]*T{&T{}}`, in which case the + // inner composite literal `{}` would has a pointer type. To make sure the + // type conversion is handled correctly, we generate the explicit AST for + // this. + var rewritten ast.Expr = fc.setType(&ast.UnaryExpr{ + OpPos: e.Pos(), + Op: token.AND, + X: fc.setType(&ast.CompositeLit{ + Elts: e.Elts, + }, ptrType.Elem()), + }, ptrType) + + if exprType, ok := exprType.(*types.Named); ok { + // Handle a special case when the pointer type is named, e.g.: + // type PS *S + // _ = []PS{{}} + // In that case the value corresponding to the inner literal `{}` is + // initialized as `&S{}` and then converted to `PS`: `[]PS{PS(&S{})}`. + typeCast := fc.setType(&ast.CallExpr{ + Fun: fc.newTypeIdent(exprType.String(), exprType.Obj()), + Lparen: e.Lbrace, + Args: []ast.Expr{rewritten}, + Rparen: e.Rbrace, + }, exprType) + rewritten = typeCast + } + return fc.translateExpr(rewritten) } collectIndexedElements := func(elementType types.Type) []string { var elements []string i := 0 - zero := c.translateExpr(c.zeroValue(elementType)).String() + zero := fc.translateExpr(fc.zeroValue(elementType)).String() for _, element := range e.Elts { if kve, isKve := element.(*ast.KeyValueExpr); isKve { - key, ok := constant.Int64Val(constant.ToInt(c.p.Types[kve.Key].Value)) + key, ok := constant.Int64Val(constant.ToInt(fc.pkgCtx.Types[kve.Key].Value)) if !ok { panic("could not get exact int") } @@ -120,7 +144,7 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { for len(elements) <= i { elements = append(elements, zero) } - elements[i] = c.translateImplicitConversionWithCloning(element, elementType).String() + elements[i] = fc.translateImplicitConversionWithCloning(element, elementType).String() i++ } return elements @@ -130,22 +154,22 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { case *types.Array: elements := collectIndexedElements(t.Elem()) if len(elements) == 0 { - return c.formatExpr("%s.zero()", c.typeName(t)) + return fc.formatExpr("%s.zero()", fc.typeName(t)) } - zero := c.translateExpr(c.zeroValue(t.Elem())).String() + zero := fc.translateExpr(fc.zeroValue(t.Elem())).String() for len(elements) < int(t.Len()) { elements = append(elements, zero) } - return c.formatExpr(`$toNativeArray(%s, [%s])`, typeKind(t.Elem()), strings.Join(elements, ", ")) + return fc.formatExpr(`$toNativeArray(%s, [%s])`, typeKind(t.Elem()), strings.Join(elements, ", ")) case *types.Slice: - return c.formatExpr("new %s([%s])", c.typeName(exprType), strings.Join(collectIndexedElements(t.Elem()), ", ")) + return fc.formatExpr("new %s([%s])", fc.typeName(exprType), strings.Join(collectIndexedElements(t.Elem()), ", ")) case *types.Map: entries := make([]string, len(e.Elts)) for i, element := range e.Elts { kve := element.(*ast.KeyValueExpr) - entries[i] = fmt.Sprintf("{ k: %s, v: %s }", c.translateImplicitConversionWithCloning(kve.Key, t.Key()), c.translateImplicitConversionWithCloning(kve.Value, t.Elem())) + entries[i] = fmt.Sprintf("{ k: %s, v: %s }", fc.translateImplicitConversionWithCloning(kve.Key, t.Key()), fc.translateImplicitConversionWithCloning(kve.Value, t.Elem())) } - return c.formatExpr("$makeMap(%s.keyFor, [%s])", c.typeName(t.Key()), strings.Join(entries, ", ")) + return fc.formatExpr("$makeMap(%s.keyFor, [%s])", fc.typeName(t.Key()), strings.Join(entries, ", ")) case *types.Struct: elements := make([]string, t.NumFields()) isKeyValue := true @@ -154,134 +178,150 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { } if !isKeyValue { for i, element := range e.Elts { - elements[i] = c.translateImplicitConversionWithCloning(element, t.Field(i).Type()).String() + elements[i] = fc.translateImplicitConversionWithCloning(element, fc.fieldType(t, i)).String() } } if isKeyValue { for i := range elements { - elements[i] = c.translateExpr(c.zeroValue(t.Field(i).Type())).String() + elements[i] = fc.translateExpr(fc.zeroValue(fc.fieldType(t, i))).String() } for _, element := range e.Elts { kve := element.(*ast.KeyValueExpr) for j := range elements { if kve.Key.(*ast.Ident).Name == t.Field(j).Name() { - elements[j] = c.translateImplicitConversionWithCloning(kve.Value, t.Field(j).Type()).String() + elements[j] = fc.translateImplicitConversionWithCloning(kve.Value, fc.fieldType(t, j)).String() break } } } } - return c.formatExpr("new %s.ptr(%s)", c.typeName(exprType), strings.Join(elements, ", ")) + return fc.formatExpr("new %s.ptr(%s)", fc.typeName(exprType), strings.Join(elements, ", ")) default: - panic(fmt.Sprintf("Unhandled CompositeLit type: %T\n", t)) + panic(fmt.Sprintf("Unhandled CompositeLit type: %[1]T %[1]v\n", t)) } case *ast.FuncLit: - _, fun := translateFunction(e.Type, nil, e.Body, c, exprType.(*types.Signature), c.p.FuncLitInfos[e], "") - if len(c.p.escapingVars) != 0 { - names := make([]string, 0, len(c.p.escapingVars)) - for obj := range c.p.escapingVars { - names = append(names, c.p.objectNames[obj]) + fun := fc.literalFuncContext(e).translateFunctionBody(e.Type, nil, e.Body) + if len(fc.pkgCtx.escapingVars) != 0 { + names := make([]string, 0, len(fc.pkgCtx.escapingVars)) + for obj := range fc.pkgCtx.escapingVars { + name, ok := fc.assignedObjectName(obj) + if !ok { + // This should never happen. + panic(fmt.Errorf("escaping variable %s hasn't been assigned a JS name", obj)) + } + names = append(names, name) } sort.Strings(names) list := strings.Join(names, ", ") - return c.formatExpr("(function(%s) { return %s; })(%s)", list, fun, list) + return fc.formatExpr("(function(%s) { return %s; })(%s)", list, fun, list) } - return c.formatExpr("(%s)", fun) + return fc.formatExpr("(%s)", fun) case *ast.UnaryExpr: - t := c.p.TypeOf(e.X) + t := fc.typeOf(e.X) switch e.Op { case token.AND: if typesutil.IsJsObject(exprType) { - return c.formatExpr("%e.object", e.X) + return fc.formatExpr("%e.object", e.X) } switch t.Underlying().(type) { case *types.Struct, *types.Array: - return c.translateExpr(e.X) + // JavaScript's pass-by-reference semantics makes passing array's or + // struct's object semantically equivalent to passing a pointer + // TODO(nevkontakte): Evaluate if performance gain justifies complexity + // introduced by the special case. + return fc.translateExpr(e.X) } + elemType := exprType.(*types.Pointer).Elem() + switch x := astutil.RemoveParens(e.X).(type) { case *ast.CompositeLit: - return c.formatExpr("$newDataPointer(%e, %s)", x, c.typeName(c.p.TypeOf(e))) + return fc.formatExpr("$newDataPointer(%e, %s)", x, fc.typeName(fc.typeOf(e))) case *ast.Ident: - obj := c.p.Uses[x].(*types.Var) - if c.p.escapingVars[obj] { - return c.formatExpr("(%1s.$ptr || (%1s.$ptr = new %2s(function() { return this.$target[0]; }, function($v) { this.$target[0] = $v; }, %1s)))", c.p.objectNames[obj], c.typeName(exprType)) + obj := fc.pkgCtx.Uses[x].(*types.Var) + if fc.pkgCtx.escapingVars[obj] { + name, ok := fc.assignedObjectName(obj) + if !ok { + // This should never happen. + panic(fmt.Errorf("escaping variable %s hasn't been assigned a JS name", obj)) + } + return fc.formatExpr("(%1s.$ptr || (%1s.$ptr = new %2s(function() { return this.$target[0]; }, function($v) { this.$target[0] = $v; }, %1s)))", name, fc.typeName(exprType)) } - return c.formatExpr(`(%1s || (%1s = new %2s(function() { return %3s; }, function($v) { %4s })))`, c.varPtrName(obj), c.typeName(exprType), c.objectName(obj), c.translateAssign(x, c.newIdent("$v", exprType), false)) + return fc.formatExpr(`(%1s || (%1s = new %2s(function() { return %3s; }, function($v) { %4s })))`, fc.varPtrName(obj), fc.typeName(exprType), fc.objectName(obj), fc.translateAssign(x, fc.newIdent("$v", elemType), false)) case *ast.SelectorExpr: - sel, ok := c.p.SelectionOf(x) + sel, ok := fc.selectionOf(x) if !ok { // qualified identifier - obj := c.p.Uses[x.Sel].(*types.Var) - return c.formatExpr(`(%1s || (%1s = new %2s(function() { return %3s; }, function($v) { %4s })))`, c.varPtrName(obj), c.typeName(exprType), c.objectName(obj), c.translateAssign(x, c.newIdent("$v", exprType), false)) + obj := fc.pkgCtx.Uses[x.Sel].(*types.Var) + return fc.formatExpr(`(%1s || (%1s = new %2s(function() { return %3s; }, function($v) { %4s })))`, fc.varPtrName(obj), fc.typeName(exprType), fc.objectName(obj), fc.translateAssign(x, fc.newIdent("$v", elemType), false)) } - newSel := &ast.SelectorExpr{X: c.newIdent("this.$target", c.p.TypeOf(x.X)), Sel: x.Sel} - c.setType(newSel, exprType) - c.p.additionalSelections[newSel] = sel - return c.formatExpr("(%1e.$ptr_%2s || (%1e.$ptr_%2s = new %3s(function() { return %4e; }, function($v) { %5s }, %1e)))", x.X, x.Sel.Name, c.typeName(exprType), newSel, c.translateAssign(newSel, c.newIdent("$v", exprType), false)) + newSel := &ast.SelectorExpr{X: fc.newIdent("this.$target", fc.typeOf(x.X)), Sel: x.Sel} + fc.setType(newSel, exprType) + fc.pkgCtx.additionalSelections[newSel] = sel + return fc.formatExpr("(%1e.$ptr_%2s || (%1e.$ptr_%2s = new %3s(function() { return %4e; }, function($v) { %5s }, %1e)))", x.X, x.Sel.Name, fc.typeName(exprType), newSel, fc.translateAssign(newSel, fc.newIdent("$v", exprType), false)) case *ast.IndexExpr: - if _, ok := c.p.TypeOf(x.X).Underlying().(*types.Slice); ok { - return c.formatExpr("$indexPtr(%1e.$array, %1e.$offset + %2e, %3s)", x.X, x.Index, c.typeName(exprType)) + if _, ok := fc.typeOf(x.X).Underlying().(*types.Slice); ok { + return fc.formatExpr("$indexPtr(%1e.$array, %1e.$offset + %2e, %3s)", x.X, x.Index, fc.typeName(exprType)) } - return c.formatExpr("$indexPtr(%e, %e, %s)", x.X, x.Index, c.typeName(exprType)) + return fc.formatExpr("$indexPtr(%e, %e, %s)", x.X, x.Index, fc.typeName(exprType)) case *ast.StarExpr: - return c.translateExpr(x.X) + return fc.translateExpr(x.X) default: panic(fmt.Sprintf("Unhandled: %T\n", x)) } case token.ARROW: call := &ast.CallExpr{ - Fun: c.newIdent("$recv", types.NewSignature(nil, types.NewTuple(types.NewVar(0, nil, "", t)), types.NewTuple(types.NewVar(0, nil, "", exprType), types.NewVar(0, nil, "", types.Typ[types.Bool])), false)), + Fun: fc.newIdent("$recv", types.NewSignatureType(nil, nil, nil, types.NewTuple(types.NewVar(0, nil, "", t)), types.NewTuple(types.NewVar(0, nil, "", exprType), types.NewVar(0, nil, "", types.Typ[types.Bool])), false)), Args: []ast.Expr{e.X}, } - c.Blocking[call] = true + fc.Blocking[call] = true if _, isTuple := exprType.(*types.Tuple); isTuple { - return c.formatExpr("%e", call) + return fc.formatExpr("%e", call) } - return c.formatExpr("%e[0]", call) + return fc.formatExpr("%e[0]", call) } basic := t.Underlying().(*types.Basic) switch e.Op { case token.ADD: - return c.translateExpr(e.X) + return fc.translateExpr(e.X) case token.SUB: switch { case is64Bit(basic): - return c.formatExpr("new %1s(-%2h, -%2l)", c.typeName(t), e.X) + return fc.formatExpr("new %1s(-%2h, -%2l)", fc.typeName(t), e.X) case isComplex(basic): - return c.formatExpr("new %1s(-%2r, -%2i)", c.typeName(t), e.X) + return fc.formatExpr("new %1s(-%2r, -%2i)", fc.typeName(t), e.X) case isUnsigned(basic): - return c.fixNumber(c.formatExpr("-%e", e.X), basic) + return fc.fixNumber(fc.formatExpr("-%e", e.X), basic) default: - return c.formatExpr("-%e", e.X) + return fc.formatExpr("-%e", e.X) } case token.XOR: if is64Bit(basic) { - return c.formatExpr("new %1s(~%2h, ~%2l >>> 0)", c.typeName(t), e.X) + return fc.formatExpr("new %1s(~%2h, ~%2l >>> 0)", fc.typeName(t), e.X) } - return c.fixNumber(c.formatExpr("~%e", e.X), basic) + return fc.fixNumber(fc.formatExpr("~%e", e.X), basic) case token.NOT: - return c.formatExpr("!%e", e.X) + return fc.formatExpr("!%e", e.X) default: panic(e.Op) } case *ast.BinaryExpr: if e.Op == token.NEQ { - return c.formatExpr("!(%s)", c.translateExpr(&ast.BinaryExpr{ + return fc.formatExpr("!(%s)", fc.translateExpr(&ast.BinaryExpr{ X: e.X, Op: token.EQL, Y: e.Y, })) } - t := c.p.TypeOf(e.X) - t2 := c.p.TypeOf(e.Y) + t := fc.typeOf(e.X) + t2 := fc.typeOf(e.Y) _, isInterface := t2.Underlying().(*types.Interface) if isInterface || types.Identical(t, types.Typ[types.UntypedNil]) { t = t2 @@ -291,31 +331,31 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { if is64Bit(basic) { switch e.Op { case token.MUL: - return c.formatExpr("$mul64(%e, %e)", e.X, e.Y) + return fc.formatExpr("$mul64(%e, %e)", e.X, e.Y) case token.QUO: - return c.formatExpr("$div64(%e, %e, false)", e.X, e.Y) + return fc.formatExpr("$div64(%e, %e, false)", e.X, e.Y) case token.REM: - return c.formatExpr("$div64(%e, %e, true)", e.X, e.Y) + return fc.formatExpr("$div64(%e, %e, true)", e.X, e.Y) case token.SHL: - return c.formatExpr("$shiftLeft64(%e, %f)", e.X, e.Y) + return fc.formatExpr("$shiftLeft64(%e, %f)", e.X, e.Y) case token.SHR: - return c.formatExpr("$shiftRight%s(%e, %f)", toJavaScriptType(basic), e.X, e.Y) + return fc.formatExpr("$shiftRight%s(%e, %f)", toJavaScriptType(basic), e.X, e.Y) case token.EQL: - return c.formatExpr("(%1h === %2h && %1l === %2l)", e.X, e.Y) + return fc.formatExpr("(%1h === %2h && %1l === %2l)", e.X, e.Y) case token.LSS: - return c.formatExpr("(%1h < %2h || (%1h === %2h && %1l < %2l))", e.X, e.Y) + return fc.formatExpr("(%1h < %2h || (%1h === %2h && %1l < %2l))", e.X, e.Y) case token.LEQ: - return c.formatExpr("(%1h < %2h || (%1h === %2h && %1l <= %2l))", e.X, e.Y) + return fc.formatExpr("(%1h < %2h || (%1h === %2h && %1l <= %2l))", e.X, e.Y) case token.GTR: - return c.formatExpr("(%1h > %2h || (%1h === %2h && %1l > %2l))", e.X, e.Y) + return fc.formatExpr("(%1h > %2h || (%1h === %2h && %1l > %2l))", e.X, e.Y) case token.GEQ: - return c.formatExpr("(%1h > %2h || (%1h === %2h && %1l >= %2l))", e.X, e.Y) + return fc.formatExpr("(%1h > %2h || (%1h === %2h && %1l >= %2l))", e.X, e.Y) case token.ADD, token.SUB: - return c.formatExpr("new %3s(%1h %4t %2h, %1l %4t %2l)", e.X, e.Y, c.typeName(t), e.Op) + return fc.formatExpr("new %3s(%1h %4t %2h, %1l %4t %2l)", e.X, e.Y, fc.typeName(t), e.Op) case token.AND, token.OR, token.XOR: - return c.formatExpr("new %3s(%1h %4t %2h, (%1l %4t %2l) >>> 0)", e.X, e.Y, c.typeName(t), e.Op) + return fc.formatExpr("new %3s(%1h %4t %2h, (%1l %4t %2l) >>> 0)", e.X, e.Y, fc.typeName(t), e.Op) case token.AND_NOT: - return c.formatExpr("new %3s(%1h & ~%2h, (%1l & ~%2l) >>> 0)", e.X, e.Y, c.typeName(t)) + return fc.formatExpr("new %3s(%1h & ~%2h, (%1l & ~%2l) >>> 0)", e.X, e.Y, fc.typeName(t)) default: panic(e.Op) } @@ -324,13 +364,13 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { if isComplex(basic) { switch e.Op { case token.EQL: - return c.formatExpr("(%1r === %2r && %1i === %2i)", e.X, e.Y) + return fc.formatExpr("(%1r === %2r && %1i === %2i)", e.X, e.Y) case token.ADD, token.SUB: - return c.formatExpr("new %3s(%1r %4t %2r, %1i %4t %2i)", e.X, e.Y, c.typeName(t), e.Op) + return fc.formatExpr("new %3s(%1r %4t %2r, %1i %4t %2i)", e.X, e.Y, fc.typeName(t), e.Op) case token.MUL: - return c.formatExpr("new %3s(%1r * %2r - %1i * %2i, %1r * %2i + %1i * %2r)", e.X, e.Y, c.typeName(t)) + return fc.formatExpr("new %3s(%1r * %2r - %1i * %2i, %1r * %2i + %1i * %2r)", e.X, e.Y, fc.typeName(t)) case token.QUO: - return c.formatExpr("$divComplex(%e, %e)", e.X, e.Y) + return fc.formatExpr("$divComplex(%e, %e)", e.X, e.Y) default: panic(e.Op) } @@ -338,19 +378,19 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { switch e.Op { case token.EQL: - return c.formatParenExpr("%e === %e", e.X, e.Y) + return fc.formatParenExpr("%e === %e", e.X, e.Y) case token.LSS, token.LEQ, token.GTR, token.GEQ: - return c.formatExpr("%e %t %e", e.X, e.Op, e.Y) + return fc.formatExpr("%e %t %e", e.X, e.Op, e.Y) case token.ADD, token.SUB: - return c.fixNumber(c.formatExpr("%e %t %e", e.X, e.Op, e.Y), basic) + return fc.fixNumber(fc.formatExpr("%e %t %e", e.X, e.Op, e.Y), basic) case token.MUL: switch basic.Kind() { case types.Int32, types.Int: - return c.formatParenExpr("$imul(%e, %e)", e.X, e.Y) - case types.Uint32, types.Uintptr: - return c.formatParenExpr("$imul(%e, %e) >>> 0", e.X, e.Y) + return fc.formatParenExpr("$imul(%e, %e)", e.X, e.Y) + case types.Uint32, types.Uint, types.Uintptr: + return fc.formatParenExpr("$imul(%e, %e) >>> 0", e.X, e.Y) } - return c.fixNumber(c.formatExpr("%e * %e", e.X, e.Y), basic) + return fc.fixNumber(fc.formatExpr("%e * %e", e.X, e.Y), basic) case token.QUO: if isInteger(basic) { // cut off decimals @@ -358,40 +398,40 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { if isUnsigned(basic) { shift = ">>>" } - return c.formatExpr(`(%1s = %2e / %3e, (%1s === %1s && %1s !== 1/0 && %1s !== -1/0) ? %1s %4s 0 : $throwRuntimeError("integer divide by zero"))`, c.newVariable("_q"), e.X, e.Y, shift) + return fc.formatExpr(`(%1s = %2e / %3e, (%1s === %1s && %1s !== 1/0 && %1s !== -1/0) ? %1s %4s 0 : $throwRuntimeError("integer divide by zero"))`, fc.newLocalVariable("_q"), e.X, e.Y, shift) } if basic.Kind() == types.Float32 { - return c.fixNumber(c.formatExpr("%e / %e", e.X, e.Y), basic) + return fc.fixNumber(fc.formatExpr("%e / %e", e.X, e.Y), basic) } - return c.formatExpr("%e / %e", e.X, e.Y) + return fc.formatExpr("%e / %e", e.X, e.Y) case token.REM: - return c.formatExpr(`(%1s = %2e %% %3e, %1s === %1s ? %1s : $throwRuntimeError("integer divide by zero"))`, c.newVariable("_r"), e.X, e.Y) + return fc.formatExpr(`(%1s = %2e %% %3e, %1s === %1s ? %1s : $throwRuntimeError("integer divide by zero"))`, fc.newLocalVariable("_r"), e.X, e.Y) case token.SHL, token.SHR: op := e.Op.String() if e.Op == token.SHR && isUnsigned(basic) { op = ">>>" } - if v := c.p.Types[e.Y].Value; v != nil { + if v := fc.pkgCtx.Types[e.Y].Value; v != nil { i, _ := constant.Uint64Val(constant.ToInt(v)) if i >= 32 { - return c.formatExpr("0") + return fc.formatExpr("0") } - return c.fixNumber(c.formatExpr("%e %s %s", e.X, op, strconv.FormatUint(i, 10)), basic) + return fc.fixNumber(fc.formatExpr("%e %s %s", e.X, op, strconv.FormatUint(i, 10)), basic) } if e.Op == token.SHR && !isUnsigned(basic) { - return c.fixNumber(c.formatParenExpr("%e >> $min(%f, 31)", e.X, e.Y), basic) + return fc.fixNumber(fc.formatParenExpr("%e >> $min(%f, 31)", e.X, e.Y), basic) } - y := c.newVariable("y") - return c.fixNumber(c.formatExpr("(%s = %f, %s < 32 ? (%e %s %s) : 0)", y, e.Y, y, e.X, op, y), basic) + y := fc.newLocalVariable("y") + return fc.fixNumber(fc.formatExpr("(%s = %f, %s < 32 ? (%e %s %s) : 0)", y, e.Y, y, e.X, op, y), basic) case token.AND, token.OR: if isUnsigned(basic) { - return c.formatParenExpr("(%e %t %e) >>> 0", e.X, e.Op, e.Y) + return fc.formatParenExpr("(%e %t %e) >>> 0", e.X, e.Op, e.Y) } - return c.formatParenExpr("%e %t %e", e.X, e.Op, e.Y) + return fc.formatParenExpr("%e %t %e", e.X, e.Op, e.Y) case token.AND_NOT: - return c.fixNumber(c.formatParenExpr("%e & ~%e", e.X, e.Y), basic) + return fc.fixNumber(fc.formatParenExpr("%e & ~%e", e.X, e.Y), basic) case token.XOR: - return c.fixNumber(c.formatParenExpr("%e ^ %e", e.X, e.Y), basic) + return fc.fixNumber(fc.formatParenExpr("%e ^ %e", e.X, e.Y), basic) default: panic(e.Op) } @@ -399,138 +439,163 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { switch e.Op { case token.ADD, token.LSS, token.LEQ, token.GTR, token.GEQ: - return c.formatExpr("%e %t %e", e.X, e.Op, e.Y) + return fc.formatExpr("%e %t %e", e.X, e.Op, e.Y) case token.LAND: - if c.Blocking[e.Y] { - skipCase := c.caseCounter - c.caseCounter++ - resultVar := c.newVariable("_v") - c.Printf("if (!(%s)) { %s = false; $s = %d; continue s; }", c.translateExpr(e.X), resultVar, skipCase) - c.Printf("%s = %s; case %d:", resultVar, c.translateExpr(e.Y), skipCase) - return c.formatExpr("%s", resultVar) - } - return c.formatExpr("%e && %e", e.X, e.Y) + if fc.Blocking[e.Y] { + skipCase := fc.caseCounter + fc.caseCounter++ + resultVar := fc.newLocalVariable("_v") + fc.Printf("if (!(%s)) { %s = false; $s = %d; continue s; }", fc.translateExpr(e.X), resultVar, skipCase) + fc.Printf("%s = %s; case %d:", resultVar, fc.translateExpr(e.Y), skipCase) + return fc.formatExpr("%s", resultVar) + } + return fc.formatExpr("%e && %e", e.X, e.Y) case token.LOR: - if c.Blocking[e.Y] { - skipCase := c.caseCounter - c.caseCounter++ - resultVar := c.newVariable("_v") - c.Printf("if (%s) { %s = true; $s = %d; continue s; }", c.translateExpr(e.X), resultVar, skipCase) - c.Printf("%s = %s; case %d:", resultVar, c.translateExpr(e.Y), skipCase) - return c.formatExpr("%s", resultVar) - } - return c.formatExpr("%e || %e", e.X, e.Y) + if fc.Blocking[e.Y] { + skipCase := fc.caseCounter + fc.caseCounter++ + resultVar := fc.newLocalVariable("_v") + fc.Printf("if (%s) { %s = true; $s = %d; continue s; }", fc.translateExpr(e.X), resultVar, skipCase) + fc.Printf("%s = %s; case %d:", resultVar, fc.translateExpr(e.Y), skipCase) + return fc.formatExpr("%s", resultVar) + } + return fc.formatExpr("%e || %e", e.X, e.Y) case token.EQL: switch u := t.Underlying().(type) { case *types.Array, *types.Struct: - return c.formatExpr("$equal(%e, %e, %s)", e.X, e.Y, c.typeName(t)) + return fc.formatExpr("$equal(%e, %e, %s)", e.X, e.Y, fc.typeName(t)) case *types.Interface: - return c.formatExpr("$interfaceIsEqual(%s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t)) - case *types.Pointer: - if _, ok := u.Elem().Underlying().(*types.Array); ok { - return c.formatExpr("$equal(%s, %s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t), c.typeName(u.Elem())) - } + return fc.formatExpr("$interfaceIsEqual(%s, %s)", fc.translateImplicitConversion(e.X, t), fc.translateImplicitConversion(e.Y, t)) case *types.Basic: if isBoolean(u) { - if b, ok := analysis.BoolValue(e.X, c.p.Info.Info); ok && b { - return c.translateExpr(e.Y) + if b, ok := analysis.BoolValue(e.X, fc.pkgCtx.Info.Info); ok && b { + return fc.translateExpr(e.Y) } - if b, ok := analysis.BoolValue(e.Y, c.p.Info.Info); ok && b { - return c.translateExpr(e.X) + if b, ok := analysis.BoolValue(e.Y, fc.pkgCtx.Info.Info); ok && b { + return fc.translateExpr(e.X) } } } - return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t)) + return fc.formatExpr("%s === %s", fc.translateImplicitConversion(e.X, t), fc.translateImplicitConversion(e.Y, t)) default: panic(e.Op) } case *ast.ParenExpr: - return c.formatParenExpr("%e", e.X) + return fc.formatParenExpr("%e", e.X) case *ast.IndexExpr: - switch t := c.p.TypeOf(e.X).Underlying().(type) { - case *types.Array, *types.Pointer: - pattern := rangeCheck("%1e[%2f]", c.p.Types[e.Index].Value != nil, true) - if _, ok := t.(*types.Pointer); ok { // check pointer for nix (attribute getter causes a panic) - pattern = `(%1e.nilCheck, ` + pattern + `)` - } - return c.formatExpr(pattern, e.X, e.Index) + switch t := fc.typeOf(e.X).Underlying().(type) { + case *types.Pointer: + if _, ok := t.Elem().Underlying().(*types.Array); !ok { + // Should never happen in type-checked code. + panic(fmt.Errorf("non-array pointers can't be used with index expression")) + } + // Rewrite arrPtr[i] → (*arrPtr)[i] to concentrate array dereferencing + // logic in one place. + x := &ast.StarExpr{ + Star: e.X.Pos(), + X: e.X, + } + astutil.SetType(fc.pkgCtx.Info.Info, t.Elem(), x) + e.X = x + return fc.translateExpr(e) + case *types.Array: + pattern := rangeCheck("%1e[%2f]", fc.pkgCtx.Types[e.Index].Value != nil, true) + return fc.formatExpr(pattern, e.X, e.Index) case *types.Slice: - return c.formatExpr(rangeCheck("%1e.$array[%1e.$offset + %2f]", c.p.Types[e.Index].Value != nil, false), e.X, e.Index) + return fc.formatExpr(rangeCheck("%1e.$array[%1e.$offset + %2f]", fc.pkgCtx.Types[e.Index].Value != nil, false), e.X, e.Index) case *types.Map: - if typesutil.IsJsObject(c.p.TypeOf(e.Index)) { - c.p.errList = append(c.p.errList, types.Error{Fset: c.p.fileSet, Pos: e.Index.Pos(), Msg: "cannot use js.Object as map key"}) + if typesutil.IsJsObject(fc.typeOf(e.Index)) { + fc.pkgCtx.errList = append(fc.pkgCtx.errList, types.Error{Fset: fc.pkgCtx.fileSet, Pos: e.Index.Pos(), Msg: "cannot use js.Object as map key"}) } - key := fmt.Sprintf("%s.keyFor(%s)", c.typeName(t.Key()), c.translateImplicitConversion(e.Index, t.Key())) + key := fmt.Sprintf("%s.keyFor(%s)", fc.typeName(t.Key()), fc.translateImplicitConversion(e.Index, t.Key())) if _, isTuple := exprType.(*types.Tuple); isTuple { - return c.formatExpr(`(%1s = %2e[%3s], %1s !== undefined ? [%1s.v, true] : [%4e, false])`, c.newVariable("_entry"), e.X, key, c.zeroValue(t.Elem())) - } - return c.formatExpr(`(%1s = %2e[%3s], %1s !== undefined ? %1s.v : %4e)`, c.newVariable("_entry"), e.X, key, c.zeroValue(t.Elem())) + return fc.formatExpr( + `(%1s = $mapIndex(%2e,%3s), %1s !== undefined ? [%1s.v, true] : [%4e, false])`, + fc.newLocalVariable("_entry"), + e.X, + key, + fc.zeroValue(t.Elem()), + ) + } + return fc.formatExpr( + `(%1s = $mapIndex(%2e,%3s), %1s !== undefined ? %1s.v : %4e)`, + fc.newLocalVariable("_entry"), + e.X, + key, + fc.zeroValue(t.Elem()), + ) case *types.Basic: - return c.formatExpr("%e.charCodeAt(%f)", e.X, e.Index) + return fc.formatExpr("%e.charCodeAt(%f)", e.X, e.Index) + case *types.Signature: + return fc.formatExpr("%s", fc.instName(fc.instanceOf(e.X.(*ast.Ident)))) default: - panic(fmt.Sprintf("Unhandled IndexExpr: %T\n", t)) + panic(fmt.Errorf(`unhandled IndexExpr: %T`, t)) + } + case *ast.IndexListExpr: + switch t := fc.typeOf(e.X).Underlying().(type) { + case *types.Signature: + return fc.formatExpr("%s", fc.instName(fc.instanceOf(e.X.(*ast.Ident)))) + default: + panic(fmt.Errorf("unhandled IndexListExpr: %T", t)) } - case *ast.SliceExpr: - if b, isBasic := c.p.TypeOf(e.X).Underlying().(*types.Basic); isBasic && isString(b) { + if b, isBasic := fc.typeOf(e.X).Underlying().(*types.Basic); isBasic && isString(b) { switch { case e.Low == nil && e.High == nil: - return c.translateExpr(e.X) + return fc.translateExpr(e.X) case e.Low == nil: - return c.formatExpr("$substring(%e, 0, %f)", e.X, e.High) + return fc.formatExpr("$substring(%e, 0, %f)", e.X, e.High) case e.High == nil: - return c.formatExpr("$substring(%e, %f)", e.X, e.Low) + return fc.formatExpr("$substring(%e, %f)", e.X, e.Low) default: - return c.formatExpr("$substring(%e, %f, %f)", e.X, e.Low, e.High) + return fc.formatExpr("$substring(%e, %f, %f)", e.X, e.Low, e.High) } } - slice := c.translateConversionToSlice(e.X, exprType) + slice := fc.translateConversionToSlice(e.X, exprType) switch { case e.Low == nil && e.High == nil: - return c.formatExpr("%s", slice) + return fc.formatExpr("%s", slice) case e.Low == nil: if e.Max != nil { - return c.formatExpr("$subslice(%s, 0, %f, %f)", slice, e.High, e.Max) + return fc.formatExpr("$subslice(%s, 0, %f, %f)", slice, e.High, e.Max) } - return c.formatExpr("$subslice(%s, 0, %f)", slice, e.High) + return fc.formatExpr("$subslice(%s, 0, %f)", slice, e.High) case e.High == nil: - return c.formatExpr("$subslice(%s, %f)", slice, e.Low) + return fc.formatExpr("$subslice(%s, %f)", slice, e.Low) default: if e.Max != nil { - return c.formatExpr("$subslice(%s, %f, %f, %f)", slice, e.Low, e.High, e.Max) + return fc.formatExpr("$subslice(%s, %f, %f, %f)", slice, e.Low, e.High, e.Max) } - return c.formatExpr("$subslice(%s, %f, %f)", slice, e.Low, e.High) + return fc.formatExpr("$subslice(%s, %f, %f)", slice, e.Low, e.High) } case *ast.SelectorExpr: - sel, ok := c.p.SelectionOf(e) + sel, ok := fc.selectionOf(e) if !ok { // qualified identifier - return c.formatExpr("%s", c.objectName(obj)) + return fc.formatExpr("%s", fc.instName(inst)) } switch sel.Kind() { case types.FieldVal: - fields, jsTag := c.translateSelection(sel, e.Pos()) + fields, jsTag := fc.translateSelection(sel, e.Pos()) if jsTag != "" { if _, ok := sel.Type().(*types.Signature); ok { - return c.formatExpr("$internalize(%1e.%2s%3s, %4s, %1e.%2s)", e.X, strings.Join(fields, "."), formatJSStructTagVal(jsTag), c.typeName(sel.Type())) + return fc.formatExpr("$internalize(%1e.%2s%3s, %4s, %1e.%2s)", e.X, strings.Join(fields, "."), formatJSStructTagVal(jsTag), fc.typeName(sel.Type())) } - return c.internalize(c.formatExpr("%e.%s%s", e.X, strings.Join(fields, "."), formatJSStructTagVal(jsTag)), sel.Type()) + return fc.internalize(fc.formatExpr("%e.%s%s", e.X, strings.Join(fields, "."), formatJSStructTagVal(jsTag)), sel.Type()) } - return c.formatExpr("%e.%s", e.X, strings.Join(fields, ".")) + return fc.formatExpr("%e.%s", e.X, strings.Join(fields, ".")) case types.MethodVal: - return c.formatExpr(`$methodVal(%s, "%s")`, c.makeReceiver(e), sel.Obj().(*types.Func).Name()) + return fc.formatExpr(`$methodVal(%s, "%s")`, fc.makeReceiver(e), sel.Obj().(*types.Func).Name()) case types.MethodExpr: - if !sel.Obj().Exported() { - c.p.dependencies[sel.Obj()] = true - } + fc.pkgCtx.DeclareDCEDep(sel.Obj(), inst.TArgs...) if _, ok := sel.Recv().Underlying().(*types.Interface); ok { - return c.formatExpr(`$ifaceMethodExpr("%s")`, sel.Obj().(*types.Func).Name()) + return fc.formatExpr(`$ifaceMethodExpr("%s")`, sel.Obj().(*types.Func).Name()) } - return c.formatExpr(`$methodExpr(%s, "%s")`, c.typeName(sel.Recv()), sel.Obj().(*types.Func).Name()) + return fc.formatExpr(`$methodExpr(%s, "%s")`, fc.typeName(sel.Recv()), sel.Obj().(*types.Func).Name()) default: panic(fmt.Sprintf("unexpected sel.Kind(): %T", sel.Kind())) } @@ -538,45 +603,48 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { case *ast.CallExpr: plainFun := astutil.RemoveParens(e.Fun) - if astutil.IsTypeExpr(plainFun, c.p.Info.Info) { - return c.formatExpr("(%s)", c.translateConversion(e.Args[0], c.p.TypeOf(plainFun))) + if astutil.IsTypeExpr(plainFun, fc.pkgCtx.Info.Info) { + return fc.formatExpr("(%s)", fc.translateConversion(e.Args[0], fc.typeOf(plainFun))) } - sig := c.p.TypeOf(plainFun).Underlying().(*types.Signature) + sig := fc.typeOf(plainFun).Underlying().(*types.Signature) switch f := plainFun.(type) { case *ast.Ident: - obj := c.p.Uses[f] + obj := fc.pkgCtx.Uses[f] if o, ok := obj.(*types.Builtin); ok { - return c.translateBuiltin(o.Name(), sig, e.Args, e.Ellipsis.IsValid()) + return fc.translateBuiltin(o.Name(), sig, e.Args, e.Ellipsis.IsValid()) } if typesutil.IsJsPackage(obj.Pkg()) && obj.Name() == "InternalObject" { - return c.translateExpr(e.Args[0]) + return fc.translateExpr(e.Args[0]) } - return c.translateCall(e, sig, c.translateExpr(f)) + return fc.translateCall(e, sig, fc.translateExpr(f)) case *ast.SelectorExpr: - sel, ok := c.p.SelectionOf(f) + sel, ok := fc.selectionOf(f) if !ok { // qualified identifier - obj := c.p.Uses[f.Sel] + obj := fc.pkgCtx.Uses[f.Sel] + if o, ok := obj.(*types.Builtin); ok { + return fc.translateBuiltin(o.Name(), sig, e.Args, e.Ellipsis.IsValid()) + } if typesutil.IsJsPackage(obj.Pkg()) { switch obj.Name() { case "Debugger": - return c.formatExpr("debugger") + return fc.formatExpr("debugger") case "InternalObject": - return c.translateExpr(e.Args[0]) + return fc.translateExpr(e.Args[0]) } } - return c.translateCall(e, sig, c.translateExpr(f)) + return fc.translateCall(e, sig, fc.translateExpr(f)) } externalizeExpr := func(e ast.Expr) string { - t := c.p.TypeOf(e) + t := fc.typeOf(e) if types.Identical(t, types.Typ[types.UntypedNil]) { return "null" } - return c.externalize(c.translateExpr(e).String(), t) + return fc.externalize(fc.translateExpr(e).String(), t) } externalizeArgs := func(args []ast.Expr) string { s := make([]string, len(args)) @@ -588,7 +656,7 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { switch sel.Kind() { case types.MethodVal: - recv := c.makeReceiver(f) + recv := fc.makeReceiver(f) declaredFuncRecv := sel.Obj().(*types.Func).Type().(*types.Signature).Recv().Type() if typesutil.IsJsObject(declaredFuncRecv) { globalRef := func(id string) string { @@ -599,60 +667,60 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { } switch sel.Obj().Name() { case "Get": - if id, ok := c.identifierConstant(e.Args[0]); ok { - return c.formatExpr("%s", globalRef(id)) + if id, ok := fc.identifierConstant(e.Args[0]); ok { + return fc.formatExpr("%s", globalRef(id)) } - return c.formatExpr("%s[$externalize(%e, $String)]", recv, e.Args[0]) + return fc.formatExpr("%s[$externalize(%e, $String)]", recv, e.Args[0]) case "Set": - if id, ok := c.identifierConstant(e.Args[0]); ok { - return c.formatExpr("%s = %s", globalRef(id), externalizeExpr(e.Args[1])) + if id, ok := fc.identifierConstant(e.Args[0]); ok { + return fc.formatExpr("%s = %s", globalRef(id), externalizeExpr(e.Args[1])) } - return c.formatExpr("%s[$externalize(%e, $String)] = %s", recv, e.Args[0], externalizeExpr(e.Args[1])) + return fc.formatExpr("%s[$externalize(%e, $String)] = %s", recv, e.Args[0], externalizeExpr(e.Args[1])) case "Delete": - return c.formatExpr("delete %s[$externalize(%e, $String)]", recv, e.Args[0]) + return fc.formatExpr("delete %s[$externalize(%e, $String)]", recv, e.Args[0]) case "Length": - return c.formatExpr("$parseInt(%s.length)", recv) + return fc.formatExpr("$parseInt(%s.length)", recv) case "Index": - return c.formatExpr("%s[%e]", recv, e.Args[0]) + return fc.formatExpr("%s[%e]", recv, e.Args[0]) case "SetIndex": - return c.formatExpr("%s[%e] = %s", recv, e.Args[0], externalizeExpr(e.Args[1])) + return fc.formatExpr("%s[%e] = %s", recv, e.Args[0], externalizeExpr(e.Args[1])) case "Call": - if id, ok := c.identifierConstant(e.Args[0]); ok { + if id, ok := fc.identifierConstant(e.Args[0]); ok { if e.Ellipsis.IsValid() { - objVar := c.newVariable("obj") - return c.formatExpr("(%s = %s, %s.%s.apply(%s, %s))", objVar, recv, objVar, id, objVar, externalizeExpr(e.Args[1])) + objVar := fc.newLocalVariable("obj") + return fc.formatExpr("(%s = %s, %s.%s.apply(%s, %s))", objVar, recv, objVar, id, objVar, externalizeExpr(e.Args[1])) } - return c.formatExpr("%s(%s)", globalRef(id), externalizeArgs(e.Args[1:])) + return fc.formatExpr("%s(%s)", globalRef(id), externalizeArgs(e.Args[1:])) } if e.Ellipsis.IsValid() { - objVar := c.newVariable("obj") - return c.formatExpr("(%s = %s, %s[$externalize(%e, $String)].apply(%s, %s))", objVar, recv, objVar, e.Args[0], objVar, externalizeExpr(e.Args[1])) + objVar := fc.newLocalVariable("obj") + return fc.formatExpr("(%s = %s, %s[$externalize(%e, $String)].apply(%s, %s))", objVar, recv, objVar, e.Args[0], objVar, externalizeExpr(e.Args[1])) } - return c.formatExpr("%s[$externalize(%e, $String)](%s)", recv, e.Args[0], externalizeArgs(e.Args[1:])) + return fc.formatExpr("%s[$externalize(%e, $String)](%s)", recv, e.Args[0], externalizeArgs(e.Args[1:])) case "Invoke": if e.Ellipsis.IsValid() { - return c.formatExpr("%s.apply(undefined, %s)", recv, externalizeExpr(e.Args[0])) + return fc.formatExpr("%s.apply(undefined, %s)", recv, externalizeExpr(e.Args[0])) } - return c.formatExpr("%s(%s)", recv, externalizeArgs(e.Args)) + return fc.formatExpr("%s(%s)", recv, externalizeArgs(e.Args)) case "New": if e.Ellipsis.IsValid() { - return c.formatExpr("new ($global.Function.prototype.bind.apply(%s, [undefined].concat(%s)))", recv, externalizeExpr(e.Args[0])) + return fc.formatExpr("new ($global.Function.prototype.bind.apply(%s, [undefined].concat(%s)))", recv, externalizeExpr(e.Args[0])) } - return c.formatExpr("new (%s)(%s)", recv, externalizeArgs(e.Args)) + return fc.formatExpr("new (%s)(%s)", recv, externalizeArgs(e.Args)) case "Bool": - return c.internalize(recv, types.Typ[types.Bool]) + return fc.internalize(recv, types.Typ[types.Bool]) case "String": - return c.internalize(recv, types.Typ[types.String]) + return fc.internalize(recv, types.Typ[types.String]) case "Int": - return c.internalize(recv, types.Typ[types.Int]) + return fc.internalize(recv, types.Typ[types.Int]) case "Int64": - return c.internalize(recv, types.Typ[types.Int64]) + return fc.internalize(recv, types.Typ[types.Int64]) case "Uint64": - return c.internalize(recv, types.Typ[types.Uint64]) + return fc.internalize(recv, types.Typ[types.Uint64]) case "Float": - return c.internalize(recv, types.Typ[types.Float64]) + return fc.internalize(recv, types.Typ[types.Float64]) case "Interface": - return c.internalize(recv, types.NewInterface(nil, nil)) + return fc.internalize(recv, types.NewInterfaceType(nil, nil)) case "Unsafe": return recv default: @@ -660,95 +728,92 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { } } - methodName := sel.Obj().Name() - if reservedKeywords[methodName] { - methodName += "$" - } - return c.translateCall(e, sig, c.formatExpr("%s.%s", recv, methodName)) + methodName := fc.methodName(sel.Obj().(*types.Func)) + return fc.translateCall(e, sig, fc.formatExpr("%s.%s", recv, methodName)) case types.FieldVal: - fields, jsTag := c.translateSelection(sel, f.Pos()) + fields, jsTag := fc.translateSelection(sel, f.Pos()) if jsTag != "" { - call := c.formatExpr("%e.%s%s(%s)", f.X, strings.Join(fields, "."), formatJSStructTagVal(jsTag), externalizeArgs(e.Args)) + call := fc.formatExpr("%e.%s%s(%s)", f.X, strings.Join(fields, "."), formatJSStructTagVal(jsTag), externalizeArgs(e.Args)) switch sig.Results().Len() { case 0: return call case 1: - return c.internalize(call, sig.Results().At(0).Type()) + return fc.internalize(call, sig.Results().At(0).Type()) default: - c.p.errList = append(c.p.errList, types.Error{Fset: c.p.fileSet, Pos: f.Pos(), Msg: "field with js tag can not have func type with multiple results"}) + fc.pkgCtx.errList = append(fc.pkgCtx.errList, types.Error{Fset: fc.pkgCtx.fileSet, Pos: f.Pos(), Msg: "field with js tag can not have func type with multiple results"}) } } - return c.translateCall(e, sig, c.formatExpr("%e.%s", f.X, strings.Join(fields, "."))) + return fc.translateCall(e, sig, fc.formatExpr("%e.%s", f.X, strings.Join(fields, "."))) case types.MethodExpr: - return c.translateCall(e, sig, c.translateExpr(f)) + return fc.translateCall(e, sig, fc.translateExpr(f)) default: panic(fmt.Sprintf("unexpected sel.Kind(): %T", sel.Kind())) } default: - return c.translateCall(e, sig, c.translateExpr(plainFun)) + return fc.translateCall(e, sig, fc.translateExpr(plainFun)) } case *ast.StarExpr: - if typesutil.IsJsObject(c.p.TypeOf(e.X)) { - return c.formatExpr("new $jsObjectPtr(%e)", e.X) + if typesutil.IsJsObject(fc.typeOf(e.X)) { + return fc.formatExpr("new $jsObjectPtr(%e)", e.X) } if c1, isCall := e.X.(*ast.CallExpr); isCall && len(c1.Args) == 1 { - if c2, isCall := c1.Args[0].(*ast.CallExpr); isCall && len(c2.Args) == 1 && types.Identical(c.p.TypeOf(c2.Fun), types.Typ[types.UnsafePointer]) { + if c2, isCall := c1.Args[0].(*ast.CallExpr); isCall && len(c2.Args) == 1 && types.Identical(fc.typeOf(c2.Fun), types.Typ[types.UnsafePointer]) { if unary, isUnary := c2.Args[0].(*ast.UnaryExpr); isUnary && unary.Op == token.AND { - return c.translateExpr(unary.X) // unsafe conversion + return fc.translateExpr(unary.X) // unsafe conversion } } } switch exprType.Underlying().(type) { case *types.Struct, *types.Array: - return c.translateExpr(e.X) + return fc.translateExpr(e.X) } - return c.formatExpr("%e.$get()", e.X) + return fc.formatExpr("%e.$get()", e.X) case *ast.TypeAssertExpr: if e.Type == nil { - return c.translateExpr(e.X) + return fc.translateExpr(e.X) } - t := c.p.TypeOf(e.Type) + t := fc.typeOf(e.Type) if _, isTuple := exprType.(*types.Tuple); isTuple { - return c.formatExpr("$assertType(%e, %s, true)", e.X, c.typeName(t)) + return fc.formatExpr("$assertType(%e, %s, true)", e.X, fc.typeName(t)) } - return c.formatExpr("$assertType(%e, %s)", e.X, c.typeName(t)) + return fc.formatExpr("$assertType(%e, %s)", e.X, fc.typeName(t)) case *ast.Ident: if e.Name == "_" { panic("Tried to translate underscore identifier.") } - switch o := obj.(type) { + switch o := inst.Object.(type) { case *types.Var, *types.Const: - return c.formatExpr("%s", c.objectName(o)) + return fc.formatExpr("%s", fc.instName(inst)) case *types.Func: - return c.formatExpr("%s", c.objectName(o)) + return fc.formatExpr("%s", fc.instName(inst)) case *types.TypeName: - return c.formatExpr("%s", c.typeName(o.Type())) + return fc.formatExpr("%s", fc.typeName(o.Type())) case *types.Nil: if typesutil.IsJsObject(exprType) { - return c.formatExpr("null") + return fc.formatExpr("null") } switch t := exprType.Underlying().(type) { case *types.Basic: if t.Kind() != types.UnsafePointer { - panic("unexpected basic type") + panic(fmt.Errorf(`unexpected basic type: %v in %v`, t, e.Name)) } - return c.formatExpr("0") + return fc.formatExpr("0") case *types.Slice, *types.Pointer: - return c.formatExpr("%s.nil", c.typeName(exprType)) + return fc.formatExpr("%s.nil", fc.typeName(exprType)) case *types.Chan: - return c.formatExpr("$chanNil") + return fc.formatExpr("$chanNil") case *types.Map: - return c.formatExpr("false") + return fc.formatExpr("false") case *types.Interface: - return c.formatExpr("$ifaceNil") + return fc.formatExpr("$ifaceNil") case *types.Signature: - return c.formatExpr("$throwNilPointerError") + return fc.formatExpr("$throwNilPointerError") default: panic(fmt.Sprintf("unexpected type: %T", t)) } @@ -757,7 +822,7 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { } case nil: - return c.formatExpr("") + return fc.formatExpr("") default: panic(fmt.Sprintf("Unhandled expression: %T\n", e)) @@ -765,28 +830,83 @@ func (c *funcContext) translateExpr(expr ast.Expr) *expression { } } -func (c *funcContext) translateCall(e *ast.CallExpr, sig *types.Signature, fun *expression) *expression { - args := c.translateArgs(sig, e.Args, e.Ellipsis.IsValid()) - if c.Blocking[e] { - resumeCase := c.caseCounter - c.caseCounter++ +func (fc *funcContext) translateCall(e *ast.CallExpr, sig *types.Signature, fun *expression) *expression { + args := fc.translateArgs(sig, e.Args, e.Ellipsis.IsValid()) + if fc.Blocking[e] { + resumeCase := fc.caseCounter + fc.caseCounter++ returnVar := "$r" if sig.Results().Len() != 0 { - returnVar = c.newVariable("_r") + returnVar = fc.newLocalVariable("_r") } - c.Printf("%[1]s = %[2]s(%[3]s); /* */ $s = %[4]d; case %[4]d: if($c) { $c = false; %[1]s = %[1]s.$blk(); } if (%[1]s && %[1]s.$blk !== undefined) { break s; }", returnVar, fun, strings.Join(args, ", "), resumeCase) + fc.Printf("%[1]s = %[2]s(%[3]s); /* */ $s = %[4]d; case %[4]d: if($c) { $c = false; %[1]s = %[1]s.$blk(); } if (%[1]s && %[1]s.$blk !== undefined) { break s; }", returnVar, fun, strings.Join(args, ", "), resumeCase) if sig.Results().Len() != 0 { - return c.formatExpr("%s", returnVar) + return fc.formatExpr("%s", returnVar) } - return c.formatExpr("") + return fc.formatExpr("") } - return c.formatExpr("%s(%s)", fun, strings.Join(args, ", ")) + return fc.formatExpr("%s(%s)", fun, strings.Join(args, ", ")) } -func (c *funcContext) makeReceiver(e *ast.SelectorExpr) *expression { - sel, _ := c.p.SelectionOf(e) +// delegatedCall returns a pair of JS expressions representing a callable function +// and its arguments to be invoked elsewhere. +// +// This function is necessary in conjunction with keywords such as `go` and `defer`, +// where we need to compute function and its arguments at the keyword site, +// but the call itself will happen elsewhere (hence "delegated"). +// +// Built-in functions and cetrain `js.Object` methods don't translate into JS +// function calls, and need to be wrapped before they can be delegated, which +// this function handles and returns JS expressions that are safe to delegate +// and behave like a regular JS function and a list of its argument values. +func (fc *funcContext) delegatedCall(expr *ast.CallExpr) (callable *expression, arglist *expression) { + isBuiltin := false + isJs := false + switch fun := expr.Fun.(type) { + case *ast.Ident: + _, isBuiltin = fc.pkgCtx.Uses[fun].(*types.Builtin) + case *ast.SelectorExpr: + isJs = typesutil.IsJsPackage(fc.pkgCtx.Uses[fun.Sel].Pkg()) + } + sig := typesutil.Signature{Sig: fc.typeOf(expr.Fun).Underlying().(*types.Signature)} + args := fc.translateArgs(sig.Sig, expr.Args, expr.Ellipsis.IsValid()) + + if !isBuiltin && !isJs { + // Normal function calls don't require wrappers. + callable = fc.translateExpr(expr.Fun) + arglist = fc.formatExpr("[%s]", strings.Join(args, ", ")) + return callable, arglist + } + + // Since some builtins or js.Object methods may not transpile into + // callable expressions, we need to wrap then in a proxy lambda in order + // to push them onto the deferral stack. + vars := make([]string, len(expr.Args)) + callArgs := make([]ast.Expr, len(expr.Args)) + ellipsis := expr.Ellipsis + + for i := range expr.Args { + v := fc.newLocalVariable("_arg") + vars[i] = v + // Subtle: the proxy lambda argument needs to be assigned with the type + // that the original function expects, and not with the argument + // expression result type, or we may do implicit type conversion twice. + callArgs[i] = fc.newIdent(v, sig.Param(i, ellipsis.IsValid())) + } + wrapper := &ast.CallExpr{ + Fun: expr.Fun, + Args: callArgs, + Ellipsis: expr.Ellipsis, + } + callable = fc.formatExpr("function(%s) { %e; }", strings.Join(vars, ", "), wrapper) + arglist = fc.formatExpr("[%s]", strings.Join(args, ", ")) + return callable, arglist +} + +func (fc *funcContext) makeReceiver(e *ast.SelectorExpr) *expression { + sel, _ := fc.selectionOf(e) if !sel.Obj().Exported() { - c.p.dependencies[sel.Obj()] = true + fc.pkgCtx.DeclareDCEDep(sel.Obj()) } x := e.X @@ -797,17 +917,12 @@ func (c *funcContext) makeReceiver(e *ast.SelectorExpr) *expression { recvType = ptr.Elem() } s := recvType.Underlying().(*types.Struct) - recvType = s.Field(index).Type() + recvType = fc.fieldType(s, index) } fakeSel := &ast.SelectorExpr{X: x, Sel: ast.NewIdent("o")} - c.p.additionalSelections[fakeSel] = &fakeSelection{ - kind: types.FieldVal, - recv: sel.Recv(), - index: sel.Index()[:len(sel.Index())-1], - typ: recvType, - } - x = c.setType(fakeSel, recvType) + fc.pkgCtx.additionalSelections[fakeSel] = typesutil.NewSelection(types.FieldVal, sel.Recv(), sel.Index()[:len(sel.Index())-1], nil, recvType) + x = fc.setType(fakeSel, recvType) } _, isPointer := recvType.Underlying().(*types.Pointer) @@ -815,117 +930,140 @@ func (c *funcContext) makeReceiver(e *ast.SelectorExpr) *expression { _, pointerExpected := methodsRecvType.(*types.Pointer) if !isPointer && pointerExpected { recvType = types.NewPointer(recvType) - x = c.setType(&ast.UnaryExpr{Op: token.AND, X: x}, recvType) + x = fc.setType(&ast.UnaryExpr{Op: token.AND, X: x}, recvType) } if isPointer && !pointerExpected { - x = c.setType(x, methodsRecvType) + x = fc.setType(x, methodsRecvType) } - recv := c.translateImplicitConversionWithCloning(x, methodsRecvType) + recv := fc.translateImplicitConversionWithCloning(x, methodsRecvType) if isWrapped(recvType) { - recv = c.formatExpr("new %s(%s)", c.typeName(methodsRecvType), recv) + // Wrap JS-native value to have access to the Go type's methods. + recv = fc.formatExpr("new %s(%s)", fc.typeName(methodsRecvType), recv) } return recv } -func (c *funcContext) translateBuiltin(name string, sig *types.Signature, args []ast.Expr, ellipsis bool) *expression { +func (fc *funcContext) translateBuiltin(name string, sig *types.Signature, args []ast.Expr, ellipsis bool) *expression { switch name { case "new": t := sig.Results().At(0).Type().(*types.Pointer) - if c.p.Pkg.Path() == "syscall" && types.Identical(t.Elem().Underlying(), types.Typ[types.Uintptr]) { - return c.formatExpr("new Uint8Array(8)") + if fc.pkgCtx.Pkg.Path() == "syscall" && types.Identical(t.Elem().Underlying(), types.Typ[types.Uintptr]) { + return fc.formatExpr("new Uint8Array(8)") } switch t.Elem().Underlying().(type) { case *types.Struct, *types.Array: - return c.formatExpr("%e", c.zeroValue(t.Elem())) + return fc.formatExpr("%e", fc.zeroValue(t.Elem())) default: - return c.formatExpr("$newDataPointer(%e, %s)", c.zeroValue(t.Elem()), c.typeName(t)) + return fc.formatExpr("$newDataPointer(%e, %s)", fc.zeroValue(t.Elem()), fc.typeName(t)) } case "make": - switch argType := c.p.TypeOf(args[0]).Underlying().(type) { + switch argType := fc.typeOf(args[0]).Underlying().(type) { case *types.Slice: - t := c.typeName(c.p.TypeOf(args[0])) + t := fc.typeName(fc.typeOf(args[0])) if len(args) == 3 { - return c.formatExpr("$makeSlice(%s, %f, %f)", t, args[1], args[2]) + return fc.formatExpr("$makeSlice(%s, %f, %f)", t, args[1], args[2]) } - return c.formatExpr("$makeSlice(%s, %f)", t, args[1]) + return fc.formatExpr("$makeSlice(%s, %f)", t, args[1]) case *types.Map: - if len(args) == 2 && c.p.Types[args[1]].Value == nil { - return c.formatExpr(`((%1f < 0 || %1f > 2147483647) ? $throwRuntimeError("makemap: size out of range") : {})`, args[1]) + if len(args) == 2 && fc.pkgCtx.Types[args[1]].Value == nil { + return fc.formatExpr(`((%1f < 0 || %1f > 2147483647) ? $throwRuntimeError("makemap: size out of range") : new $global.Map())`, args[1]) } - return c.formatExpr("{}") + return fc.formatExpr("new $global.Map()") case *types.Chan: length := "0" if len(args) == 2 { - length = c.formatExpr("%f", args[1]).String() + length = fc.formatExpr("%f", args[1]).String() } - return c.formatExpr("new $Chan(%s, %s)", c.typeName(c.p.TypeOf(args[0]).Underlying().(*types.Chan).Elem()), length) + return fc.formatExpr("new $Chan(%s, %s)", fc.typeName(fc.typeOf(args[0]).Underlying().(*types.Chan).Elem()), length) default: panic(fmt.Sprintf("Unhandled make type: %T\n", argType)) } case "len": - switch argType := c.p.TypeOf(args[0]).Underlying().(type) { + switch argType := fc.typeOf(args[0]).Underlying().(type) { case *types.Basic: - return c.formatExpr("%e.length", args[0]) + // If the argument is a concatenation of strings, then add parentheses. + if _, ok := args[0].(*ast.BinaryExpr); ok { + return fc.formatExpr("(%e).length", args[0]) + } + return fc.formatExpr("%e.length", args[0]) case *types.Slice: - return c.formatExpr("%e.$length", args[0]) + return fc.formatExpr("%e.$length", args[0]) case *types.Pointer: - return c.formatExpr("(%e, %d)", args[0], argType.Elem().(*types.Array).Len()) + return fc.formatExpr("(%e, %d)", args[0], argType.Elem().(*types.Array).Len()) case *types.Map: - return c.formatExpr("$keys(%e).length", args[0]) + return fc.formatExpr("(%e ? %e.size : 0)", args[0], args[0]) case *types.Chan: - return c.formatExpr("%e.$buffer.length", args[0]) + return fc.formatExpr("%e.$buffer.length", args[0]) // length of array is constant default: panic(fmt.Sprintf("Unhandled len type: %T\n", argType)) } case "cap": - switch argType := c.p.TypeOf(args[0]).Underlying().(type) { + switch argType := fc.typeOf(args[0]).Underlying().(type) { case *types.Slice, *types.Chan: - return c.formatExpr("%e.$capacity", args[0]) + return fc.formatExpr("%e.$capacity", args[0]) case *types.Pointer: - return c.formatExpr("(%e, %d)", args[0], argType.Elem().(*types.Array).Len()) + return fc.formatExpr("(%e, %d)", args[0], argType.Elem().(*types.Array).Len()) // capacity of array is constant default: panic(fmt.Sprintf("Unhandled cap type: %T\n", argType)) } case "panic": - return c.formatExpr("$panic(%s)", c.translateImplicitConversion(args[0], types.NewInterface(nil, nil))) + return fc.formatExpr("$panic(%s)", fc.translateImplicitConversion(args[0], types.NewInterfaceType(nil, nil))) case "append": if ellipsis || len(args) == 1 { - argStr := c.translateArgs(sig, args, ellipsis) - return c.formatExpr("$appendSlice(%s, %s)", argStr[0], argStr[1]) + argStr := fc.translateArgs(sig, args, ellipsis) + return fc.formatExpr("$appendSlice(%s, %s)", argStr[0], argStr[1]) } sliceType := sig.Results().At(0).Type().Underlying().(*types.Slice) - return c.formatExpr("$append(%e, %s)", args[0], strings.Join(c.translateExprSlice(args[1:], sliceType.Elem()), ", ")) + return fc.formatExpr("$append(%e, %s)", args[0], strings.Join(fc.translateExprSlice(args[1:], sliceType.Elem()), ", ")) case "delete": - keyType := c.p.TypeOf(args[0]).Underlying().(*types.Map).Key() - return c.formatExpr(`delete %e[%s.keyFor(%s)]`, args[0], c.typeName(keyType), c.translateImplicitConversion(args[1], keyType)) + args = fc.expandTupleArgs(args) + keyType := fc.typeOf(args[0]).Underlying().(*types.Map).Key() + return fc.formatExpr( + `$mapDelete(%1e, %2s.keyFor(%3s))`, + args[0], + fc.typeName(keyType), + fc.translateImplicitConversion(args[1], keyType), + ) case "copy": - if basic, isBasic := c.p.TypeOf(args[1]).Underlying().(*types.Basic); isBasic && isString(basic) { - return c.formatExpr("$copyString(%e, %e)", args[0], args[1]) + args = fc.expandTupleArgs(args) + if basic, isBasic := fc.typeOf(args[1]).Underlying().(*types.Basic); isBasic && isString(basic) { + return fc.formatExpr("$copyString(%e, %e)", args[0], args[1]) } - return c.formatExpr("$copySlice(%e, %e)", args[0], args[1]) - case "print", "println": - return c.formatExpr("console.log(%s)", strings.Join(c.translateExprSlice(args, nil), ", ")) + return fc.formatExpr("$copySlice(%e, %e)", args[0], args[1]) + case "print": + args = fc.expandTupleArgs(args) + return fc.formatExpr("$print(%s)", strings.Join(fc.translateExprSlice(args, nil), ", ")) + case "println": + args = fc.expandTupleArgs(args) + return fc.formatExpr("console.log(%s)", strings.Join(fc.translateExprSlice(args, nil), ", ")) case "complex": - argStr := c.translateArgs(sig, args, ellipsis) - return c.formatExpr("new %s(%s, %s)", c.typeName(sig.Results().At(0).Type()), argStr[0], argStr[1]) + argStr := fc.translateArgs(sig, args, ellipsis) + return fc.formatExpr("new %s(%s, %s)", fc.typeName(sig.Results().At(0).Type()), argStr[0], argStr[1]) case "real": - return c.formatExpr("%e.$real", args[0]) + return fc.formatExpr("%e.$real", args[0]) case "imag": - return c.formatExpr("%e.$imag", args[0]) + return fc.formatExpr("%e.$imag", args[0]) case "recover": - return c.formatExpr("$recover()") + return fc.formatExpr("$recover()") case "close": - return c.formatExpr(`$close(%e)`, args[0]) + return fc.formatExpr(`$close(%e)`, args[0]) + case "Sizeof": + return fc.formatExpr("%d", sizes32.Sizeof(fc.typeOf(args[0]))) + case "Alignof": + return fc.formatExpr("%d", sizes32.Alignof(fc.typeOf(args[0]))) + case "Offsetof": + sel, _ := fc.selectionOf(astutil.RemoveParens(args[0]).(*ast.SelectorExpr)) + return fc.formatExpr("%d", typesutil.OffsetOf(sizes32, sel)) default: panic(fmt.Sprintf("Unhandled builtin: %s\n", name)) } } -func (c *funcContext) identifierConstant(expr ast.Expr) (string, bool) { - val := c.p.Types[expr].Value +func (fc *funcContext) identifierConstant(expr ast.Expr) (string, bool) { + val := fc.pkgCtx.Types[expr].Value if val == nil { return "", false } @@ -941,29 +1079,29 @@ func (c *funcContext) identifierConstant(expr ast.Expr) (string, bool) { return s, true } -func (c *funcContext) translateExprSlice(exprs []ast.Expr, desiredType types.Type) []string { +func (fc *funcContext) translateExprSlice(exprs []ast.Expr, desiredType types.Type) []string { parts := make([]string, len(exprs)) for i, expr := range exprs { - parts[i] = c.translateImplicitConversion(expr, desiredType).String() + parts[i] = fc.translateImplicitConversion(expr, desiredType).String() } return parts } -func (c *funcContext) translateConversion(expr ast.Expr, desiredType types.Type) *expression { - exprType := c.p.TypeOf(expr) +func (fc *funcContext) translateConversion(expr ast.Expr, desiredType types.Type) *expression { + exprType := fc.typeOf(expr) if types.Identical(exprType, desiredType) { - return c.translateExpr(expr) + return fc.translateExpr(expr) } - if c.p.Pkg.Path() == "reflect" { - if call, isCall := expr.(*ast.CallExpr); isCall && types.Identical(c.p.TypeOf(call.Fun), types.Typ[types.UnsafePointer]) { + if fc.pkgCtx.Pkg.Path() == "reflect" || fc.pkgCtx.Pkg.Path() == "internal/reflectlite" { + if call, isCall := expr.(*ast.CallExpr); isCall && types.Identical(fc.typeOf(call.Fun), types.Typ[types.UnsafePointer]) { if ptr, isPtr := desiredType.(*types.Pointer); isPtr { if named, isNamed := ptr.Elem().(*types.Named); isNamed { switch named.Obj().Name() { case "arrayType", "chanType", "funcType", "interfaceType", "mapType", "ptrType", "sliceType", "structType": - return c.formatExpr("%e.kindType", call.Args[0]) // unsafe conversion + return fc.formatExpr("%e.kindType", call.Args[0]) // unsafe conversion default: - return c.translateExpr(expr) + return fc.translateExpr(expr) } } } @@ -979,72 +1117,70 @@ func (c *funcContext) translateConversion(expr ast.Expr, desiredType types.Type) case is64Bit(t): if !is64Bit(basicExprType) { if basicExprType.Kind() == types.Uintptr { // this might be an Object returned from reflect.Value.Pointer() - return c.formatExpr("new %1s(0, %2e.constructor === Number ? %2e : 1)", c.typeName(desiredType), expr) + return fc.formatExpr("new %1s(0, %2e.constructor === Number ? %2e : 1)", fc.typeName(desiredType), expr) } - return c.formatExpr("new %s(0, %e)", c.typeName(desiredType), expr) + return fc.formatExpr("new %s(0, %e)", fc.typeName(desiredType), expr) } - return c.formatExpr("new %1s(%2h, %2l)", c.typeName(desiredType), expr) + return fc.formatExpr("new %1s(%2h, %2l)", fc.typeName(desiredType), expr) case is64Bit(basicExprType): if !isUnsigned(t) && !isUnsigned(basicExprType) { - return c.fixNumber(c.formatParenExpr("%1l + ((%1h >> 31) * 4294967296)", expr), t) + return fc.fixNumber(fc.formatParenExpr("%1l + ((%1h >> 31) * 4294967296)", expr), t) } - return c.fixNumber(c.formatExpr("%s.$low", c.translateExpr(expr)), t) - case isFloat(basicExprType): - return c.formatParenExpr("%e >> 0", expr) + return fc.fixNumber(fc.formatExpr("%s.$low", fc.translateExpr(expr)), t) case types.Identical(exprType, types.Typ[types.UnsafePointer]): - return c.translateExpr(expr) + return fc.translateExpr(expr) default: - return c.fixNumber(c.translateExpr(expr), t) + return fc.fixNumber(fc.translateExpr(expr), t) } case isFloat(t): if t.Kind() == types.Float32 && exprType.Underlying().(*types.Basic).Kind() == types.Float64 { - return c.formatExpr("$fround(%e)", expr) + return fc.formatExpr("$fround(%e)", expr) } - return c.formatExpr("%f", expr) + return fc.formatExpr("%f", expr) case isComplex(t): - return c.formatExpr("new %1s(%2r, %2i)", c.typeName(desiredType), expr) + return fc.formatExpr("new %1s(%2r, %2i)", fc.typeName(desiredType), expr) case isString(t): - value := c.translateExpr(expr) + value := fc.translateExpr(expr) switch et := exprType.Underlying().(type) { case *types.Basic: if is64Bit(et) { - value = c.formatExpr("%s.$low", value) + value = fc.formatExpr("%s.$low", value) } if isNumeric(et) { - return c.formatExpr("$encodeRune(%s)", value) + return fc.formatExpr("$encodeRune(%s)", value) } return value case *types.Slice: if types.Identical(et.Elem().Underlying(), types.Typ[types.Rune]) { - return c.formatExpr("$runesToString(%s)", value) + return fc.formatExpr("$runesToString(%s)", value) } - return c.formatExpr("$bytesToString(%s)", value) + return fc.formatExpr("$bytesToString(%s)", value) default: panic(fmt.Sprintf("Unhandled conversion: %v\n", et)) } case t.Kind() == types.UnsafePointer: if unary, isUnary := expr.(*ast.UnaryExpr); isUnary && unary.Op == token.AND { if indexExpr, isIndexExpr := unary.X.(*ast.IndexExpr); isIndexExpr { - return c.formatExpr("$sliceToArray(%s)", c.translateConversionToSlice(indexExpr.X, types.NewSlice(types.Typ[types.Uint8]))) + return fc.formatExpr("$sliceToNativeArray(%s)", fc.translateConversionToSlice(indexExpr.X, types.NewSlice(types.Typ[types.Uint8]))) } if ident, isIdent := unary.X.(*ast.Ident); isIdent && ident.Name == "_zero" { - return c.formatExpr("new Uint8Array(0)") + return fc.formatExpr("new Uint8Array(0)") } } - if ptr, isPtr := c.p.TypeOf(expr).(*types.Pointer); c.p.Pkg.Path() == "syscall" && isPtr { + if ptr, isPtr := fc.typeOf(expr).(*types.Pointer); fc.pkgCtx.Pkg.Path() == "syscall" && isPtr { if s, isStruct := ptr.Elem().Underlying().(*types.Struct); isStruct { - array := c.newVariable("_array") - target := c.newVariable("_struct") - c.Printf("%s = new Uint8Array(%d);", array, sizes32.Sizeof(s)) - c.Delayed(func() { - c.Printf("%s = %s, %s;", target, c.translateExpr(expr), c.loadStruct(array, target, s)) + array := fc.newLocalVariable("_array") + target := fc.newLocalVariable("_struct") + fc.Printf("%s = new Uint8Array(%d);", array, sizes32.Sizeof(s)) + fc.Delayed(func() { + fc.Printf("%s = %s, %s;", target, fc.translateExpr(expr), fc.loadStruct(array, target, s)) }) - return c.formatExpr("%s", array) + return fc.formatExpr("%s", array) } } if call, ok := expr.(*ast.CallExpr); ok { if id, ok := call.Fun.(*ast.Ident); ok && id.Name == "new" { - return c.formatExpr("new Uint8Array(%d)", int(sizes32.Sizeof(c.p.TypeOf(call.Args[0])))) + return fc.formatExpr("new Uint8Array(%d)", int(sizes32.Sizeof(fc.typeOf(call.Args[0])))) } } } @@ -1054,114 +1190,137 @@ func (c *funcContext) translateConversion(expr ast.Expr, desiredType types.Type) case *types.Basic: if isString(et) { if types.Identical(t.Elem().Underlying(), types.Typ[types.Rune]) { - return c.formatExpr("new %s($stringToRunes(%e))", c.typeName(desiredType), expr) + return fc.formatExpr("new %s($stringToRunes(%e))", fc.typeName(desiredType), expr) } - return c.formatExpr("new %s($stringToBytes(%e))", c.typeName(desiredType), expr) + return fc.formatExpr("new %s($stringToBytes(%e))", fc.typeName(desiredType), expr) } case *types.Array, *types.Pointer: - return c.formatExpr("new %s(%e)", c.typeName(desiredType), expr) + return fc.formatExpr("new %s(%e)", fc.typeName(desiredType), expr) } case *types.Pointer: - switch u := t.Elem().Underlying().(type) { - case *types.Array: - return c.translateExpr(expr) - case *types.Struct: - if c.p.Pkg.Path() == "syscall" && types.Identical(exprType, types.Typ[types.UnsafePointer]) { - array := c.newVariable("_array") - target := c.newVariable("_struct") - return c.formatExpr("(%s = %e, %s = %e, %s, %s)", array, expr, target, c.zeroValue(t.Elem()), c.loadStruct(array, target, u), target) - } - return c.formatExpr("$pointerOfStructConversion(%e, %s)", expr, c.typeName(t)) + if types.Identical(exprType, types.Typ[types.UntypedNil]) { + // Fall through to the fc.translateImplicitConversionWithCloning(), which + // handles conversion from untyped nil to a pointer type. + break } - if !types.Identical(exprType, types.Typ[types.UnsafePointer]) { - exprTypeElem := exprType.Underlying().(*types.Pointer).Elem() - ptrVar := c.newVariable("_ptr") - getterConv := c.translateConversion(c.setType(&ast.StarExpr{X: c.newIdent(ptrVar, exprType)}, exprTypeElem), t.Elem()) - setterConv := c.translateConversion(c.newIdent("$v", t.Elem()), exprTypeElem) - return c.formatExpr("(%1s = %2e, new %3s(function() { return %4s; }, function($v) { %1s.$set(%5s); }, %1s.$target))", ptrVar, expr, c.typeName(desiredType), getterConv, setterConv) + switch ptrElType := t.Elem().Underlying().(type) { + case *types.Array: // (*[N]T)(expr) — converting expr to a pointer to an array. + if _, ok := exprType.Underlying().(*types.Slice); ok { + return fc.formatExpr("$sliceToGoArray(%e, %s)", expr, fc.typeName(desiredType)) + } + // TODO(nevkontakte): Is this just for aliased types (e.g. `type a [4]byte`)? + return fc.translateExpr(expr) + case *types.Struct: // (*StructT)(expr) — converting expr to a pointer to a struct. + if fc.pkgCtx.Pkg.Path() == "syscall" && types.Identical(exprType, types.Typ[types.UnsafePointer]) { + // Special case: converting an unsafe pointer to a byte array into a + // struct pointer when handling syscalls. + // TODO(nevkontakte): Add a runtime assertion that the unsafe.Pointer is + // indeed pointing at a byte array. + array := fc.newLocalVariable("_array") + target := fc.newLocalVariable("_struct") + return fc.formatExpr("(%s = %e, %s = %e, %s, %s)", array, expr, target, fc.zeroValue(t.Elem()), fc.loadStruct(array, target, ptrElType), target) + } + // Convert between structs of different types but identical layouts, + // for example: + // type A struct { foo int }; type B A; var a *A = &A{42}; var b *B = (*B)(a) + // + // TODO(nevkontakte): Should this only apply when exprType is a pointer to a + // struct as well? + return fc.formatExpr("$pointerOfStructConversion(%e, %s)", expr, fc.typeName(desiredType)) } + if types.Identical(exprType, types.Typ[types.UnsafePointer]) { + // TODO(nevkontakte): Why do we fall through to the implicit conversion here? + // Conversion from unsafe.Pointer() requires explicit type conversion: https://play.golang.org/p/IQxtmpn1wgc. + // Possibly related to https://github.com/gopherjs/gopherjs/issues/1001. + break // Fall through to fc.translateImplicitConversionWithCloning() below. + } + // Handle remaining cases, for example: + // type iPtr *int; var c int = 42; println((iPtr)(&c)); + // TODO(nevkontakte): Are there any other cases that fall into this case? + exprTypeElem := exprType.Underlying().(*types.Pointer).Elem() + ptrVar := fc.newLocalVariable("_ptr") + getterConv := fc.translateConversion(fc.setType(&ast.StarExpr{X: fc.newIdent(ptrVar, exprType)}, exprTypeElem), t.Elem()) + setterConv := fc.translateConversion(fc.newIdent("$v", t.Elem()), exprTypeElem) + return fc.formatExpr("(%1s = %2e, new %3s(function() { return %4s; }, function($v) { %1s.$set(%5s); }, %1s.$target))", ptrVar, expr, fc.typeName(desiredType), getterConv, setterConv) + case *types.Interface: if types.Identical(exprType, types.Typ[types.UnsafePointer]) { - return c.translateExpr(expr) + return fc.translateExpr(expr) } } - return c.translateImplicitConversionWithCloning(expr, desiredType) + return fc.translateImplicitConversionWithCloning(expr, desiredType) } -func (c *funcContext) translateImplicitConversionWithCloning(expr ast.Expr, desiredType types.Type) *expression { +func (fc *funcContext) translateImplicitConversionWithCloning(expr ast.Expr, desiredType types.Type) *expression { switch desiredType.Underlying().(type) { case *types.Struct, *types.Array: - switch expr.(type) { - case nil, *ast.CompositeLit: - // nothing - default: - return c.formatExpr("$clone(%e, %s)", expr, c.typeName(desiredType)) - } + return fc.formatExpr("$clone(%e, %s)", expr, fc.typeName(desiredType)) } - return c.translateImplicitConversion(expr, desiredType) + return fc.translateImplicitConversion(expr, desiredType) } -func (c *funcContext) translateImplicitConversion(expr ast.Expr, desiredType types.Type) *expression { +func (fc *funcContext) translateImplicitConversion(expr ast.Expr, desiredType types.Type) *expression { if desiredType == nil { - return c.translateExpr(expr) + return fc.translateExpr(expr) } - exprType := c.p.TypeOf(expr) + exprType := fc.typeOf(expr) if types.Identical(exprType, desiredType) { - return c.translateExpr(expr) + return fc.translateExpr(expr) } basicExprType, isBasicExpr := exprType.Underlying().(*types.Basic) if isBasicExpr && basicExprType.Kind() == types.UntypedNil { - return c.formatExpr("%e", c.zeroValue(desiredType)) + return fc.formatExpr("%e", fc.zeroValue(desiredType)) } switch desiredType.Underlying().(type) { case *types.Slice: - return c.formatExpr("$subslice(new %1s(%2e.$array), %2e.$offset, %2e.$offset + %2e.$length)", c.typeName(desiredType), expr) + return fc.formatExpr("$convertSliceType(%1e, %2s)", expr, fc.typeName(desiredType)) case *types.Interface: if typesutil.IsJsObject(exprType) { // wrap JS object into js.Object struct when converting to interface - return c.formatExpr("new $jsObjectPtr(%e)", expr) + return fc.formatExpr("new $jsObjectPtr(%e)", expr) } if isWrapped(exprType) { - return c.formatExpr("new %s(%e)", c.typeName(exprType), expr) + return fc.formatExpr("new %s(%e)", fc.typeName(exprType), expr) } if _, isStruct := exprType.Underlying().(*types.Struct); isStruct { - return c.formatExpr("new %1e.constructor.elem(%1e)", expr) + return fc.formatExpr("new %1e.constructor.elem(%1e)", expr) } } - return c.translateExpr(expr) + return fc.translateExpr(expr) } -func (c *funcContext) translateConversionToSlice(expr ast.Expr, desiredType types.Type) *expression { - switch c.p.TypeOf(expr).Underlying().(type) { +func (fc *funcContext) translateConversionToSlice(expr ast.Expr, desiredType types.Type) *expression { + switch fc.typeOf(expr).Underlying().(type) { case *types.Array, *types.Pointer: - return c.formatExpr("new %s(%e)", c.typeName(desiredType), expr) + return fc.formatExpr("new %s(%e)", fc.typeName(desiredType), expr) } - return c.translateExpr(expr) + return fc.translateExpr(expr) } -func (c *funcContext) loadStruct(array, target string, s *types.Struct) string { - view := c.newVariable("_view") +func (fc *funcContext) loadStruct(array, target string, s *types.Struct) string { + view := fc.newLocalVariable("_view") code := fmt.Sprintf("%s = new DataView(%s.buffer, %s.byteOffset)", view, array, array) var fields []*types.Var var collectFields func(s *types.Struct, path string) collectFields = func(s *types.Struct, path string) { for i := 0; i < s.NumFields(); i++ { - field := s.Field(i) - if fs, isStruct := field.Type().Underlying().(*types.Struct); isStruct { - collectFields(fs, path+"."+fieldName(s, i)) + fieldName := path + "." + fieldName(s, i) + fieldType := fc.fieldType(s, i) + if fs, isStruct := fieldType.Underlying().(*types.Struct); isStruct { + collectFields(fs, fieldName) continue } - fields = append(fields, types.NewVar(0, nil, path+"."+fieldName(s, i), field.Type())) + fields = append(fields, types.NewVar(0, nil, fieldName, fieldType)) } } collectFields(s, target) @@ -1171,7 +1330,7 @@ func (c *funcContext) loadStruct(array, target string, s *types.Struct) string { case *types.Basic: if isNumeric(t) { if is64Bit(t) { - code += fmt.Sprintf(", %s = new %s(%s.getUint32(%d, true), %s.getUint32(%d, true))", field.Name(), c.typeName(field.Type()), view, offsets[i]+4, view, offsets[i]) + code += fmt.Sprintf(", %s = new %s(%s.getUint32(%d, true), %s.getUint32(%d, true))", field.Name(), fc.typeName(field.Type()), view, offsets[i]+4, view, offsets[i]) break } code += fmt.Sprintf(", %s = %s.get%s(%d, true)", field.Name(), view, toJavaScriptType(t), offsets[i]) @@ -1179,26 +1338,27 @@ func (c *funcContext) loadStruct(array, target string, s *types.Struct) string { case *types.Array: code += fmt.Sprintf(`, %s = new ($nativeArray(%s))(%s.buffer, $min(%s.byteOffset + %d, %s.buffer.byteLength))`, field.Name(), typeKind(t.Elem()), array, array, offsets[i], array) } + // TODO(nevkontakte): Explicitly panic if unsupported field type is encountered? } return code } -func (c *funcContext) fixNumber(value *expression, basic *types.Basic) *expression { +func (fc *funcContext) fixNumber(value *expression, basic *types.Basic) *expression { switch basic.Kind() { case types.Int8: - return c.formatParenExpr("%s << 24 >> 24", value) + return fc.formatParenExpr("%s << 24 >> 24", value) case types.Uint8: - return c.formatParenExpr("%s << 24 >>> 24", value) + return fc.formatParenExpr("%s << 24 >>> 24", value) case types.Int16: - return c.formatParenExpr("%s << 16 >> 16", value) + return fc.formatParenExpr("%s << 16 >> 16", value) case types.Uint16: - return c.formatParenExpr("%s << 16 >>> 16", value) + return fc.formatParenExpr("%s << 16 >>> 16", value) case types.Int32, types.Int, types.UntypedInt: - return c.formatParenExpr("%s >> 0", value) + return fc.formatParenExpr("%s >> 0", value) case types.Uint32, types.Uint, types.Uintptr: - return c.formatParenExpr("%s >>> 0", value) + return fc.formatParenExpr("%s >>> 0", value) case types.Float32: - return c.formatExpr("$fround(%s)", value) + return fc.formatExpr("$fround(%s)", value) case types.Float64: return value default: @@ -1206,7 +1366,7 @@ func (c *funcContext) fixNumber(value *expression, basic *types.Basic) *expressi } } -func (c *funcContext) internalize(s *expression, t types.Type) *expression { +func (fc *funcContext) internalize(s *expression, t types.Type) *expression { if typesutil.IsJsObject(t) { return s } @@ -1214,25 +1374,25 @@ func (c *funcContext) internalize(s *expression, t types.Type) *expression { case *types.Basic: switch { case isBoolean(u): - return c.formatExpr("!!(%s)", s) + return fc.formatExpr("!!(%s)", s) case isInteger(u) && !is64Bit(u): - return c.fixNumber(c.formatExpr("$parseInt(%s)", s), u) + return fc.fixNumber(fc.formatExpr("$parseInt(%s)", s), u) case isFloat(u): - return c.formatExpr("$parseFloat(%s)", s) + return fc.formatExpr("$parseFloat(%s)", s) } } - return c.formatExpr("$internalize(%s, %s)", s, c.typeName(t)) + return fc.formatExpr("$internalize(%s, %s)", s, fc.typeName(t)) } -func (c *funcContext) formatExpr(format string, a ...interface{}) *expression { - return c.formatExprInternal(format, a, false) +func (fc *funcContext) formatExpr(format string, a ...interface{}) *expression { + return fc.formatExprInternal(format, a, false) } -func (c *funcContext) formatParenExpr(format string, a ...interface{}) *expression { - return c.formatExprInternal(format, a, true) +func (fc *funcContext) formatParenExpr(format string, a ...interface{}) *expression { + return fc.formatExprInternal(format, a, true) } -func (c *funcContext) formatExprInternal(format string, a []interface{}, parens bool) *expression { +func (fc *funcContext) formatExprInternal(format string, a []interface{}, parens bool) *expression { processFormat := func(f func(uint8, uint8, int)) { n := 0 for i := 0; i < len(format); i++ { @@ -1271,7 +1431,7 @@ func (c *funcContext) formatExprInternal(format string, a []interface{}, parens if _, isIdent := e.(*ast.Ident); isIdent { continue } - if val := c.p.Types[e.(ast.Expr)].Value; val != nil { + if val := fc.pkgCtx.Types[e.(ast.Expr)].Value; val != nil { continue } if !hasAssignments { @@ -1279,8 +1439,8 @@ func (c *funcContext) formatExprInternal(format string, a []interface{}, parens out.WriteByte('(') parens = false } - v := c.newVariable("x") - out.WriteString(v + " = " + c.translateExpr(e.(ast.Expr)).String() + ", ") + v := fc.newLocalVariable("x") + out.WriteString(v + " = " + fc.translateExpr(e.(ast.Expr)).String() + ", ") vars[i] = v } @@ -1290,7 +1450,7 @@ func (c *funcContext) formatExprInternal(format string, a []interface{}, parens out.WriteString(vars[n] + suffix) return } - out.WriteString(c.translateExpr(a[n].(ast.Expr)).StringWithParens() + suffix) + out.WriteString(fc.translateExpr(a[n].(ast.Expr)).StringWithParens() + suffix) } switch k { case 0: @@ -1302,24 +1462,24 @@ func (c *funcContext) formatExprInternal(format string, a []interface{}, parens } out.WriteString(a[n].(string)) case 'd': - out.WriteString(strconv.Itoa(a[n].(int))) + fmt.Fprintf(out, "%d", a[n]) case 't': out.WriteString(a[n].(token.Token).String()) case 'e': e := a[n].(ast.Expr) - if val := c.p.Types[e].Value; val != nil { - out.WriteString(c.translateExpr(e).String()) + if val := fc.pkgCtx.Types[e].Value; val != nil { + out.WriteString(fc.translateExpr(e).String()) return } writeExpr("") case 'f': e := a[n].(ast.Expr) - if val := c.p.Types[e].Value; val != nil { + if val := fc.pkgCtx.Types[e].Value; val != nil { d, _ := constant.Int64Val(constant.ToInt(val)) out.WriteString(strconv.FormatInt(d, 10)) return } - if is64Bit(c.p.TypeOf(e).Underlying().(*types.Basic)) { + if is64Bit(fc.typeOf(e).Underlying().(*types.Basic)) { out.WriteString("$flatten64(") writeExpr("") out.WriteString(")") @@ -1328,9 +1488,9 @@ func (c *funcContext) formatExprInternal(format string, a []interface{}, parens writeExpr("") case 'h': e := a[n].(ast.Expr) - if val := c.p.Types[e].Value; val != nil { + if val := fc.pkgCtx.Types[e].Value; val != nil { d, _ := constant.Uint64Val(constant.ToInt(val)) - if c.p.TypeOf(e).Underlying().(*types.Basic).Kind() == types.Int64 { + if fc.typeOf(e).Underlying().(*types.Basic).Kind() == types.Int64 { out.WriteString(strconv.FormatInt(int64(d)>>32, 10)) return } @@ -1339,21 +1499,21 @@ func (c *funcContext) formatExprInternal(format string, a []interface{}, parens } writeExpr(".$high") case 'l': - if val := c.p.Types[a[n].(ast.Expr)].Value; val != nil { + if val := fc.pkgCtx.Types[a[n].(ast.Expr)].Value; val != nil { d, _ := constant.Uint64Val(constant.ToInt(val)) out.WriteString(strconv.FormatUint(d&(1<<32-1), 10)) return } writeExpr(".$low") case 'r': - if val := c.p.Types[a[n].(ast.Expr)].Value; val != nil { + if val := fc.pkgCtx.Types[a[n].(ast.Expr)].Value; val != nil { r, _ := constant.Float64Val(constant.Real(val)) out.WriteString(strconv.FormatFloat(r, 'g', -1, 64)) return } writeExpr(".$real") case 'i': - if val := c.p.Types[a[n].(ast.Expr)].Value; val != nil { + if val := fc.pkgCtx.Types[a[n].(ast.Expr)].Value; val != nil { i, _ := constant.Float64Val(constant.Imag(val)) out.WriteString(strconv.FormatFloat(i, 'g', -1, 64)) return diff --git a/compiler/functions.go b/compiler/functions.go new file mode 100644 index 000000000..361c92f0f --- /dev/null +++ b/compiler/functions.go @@ -0,0 +1,355 @@ +package compiler + +// functions.go contains logic responsible for translating top-level functions +// and function literals. + +import ( + "bytes" + "errors" + "fmt" + "go/ast" + "go/types" + "sort" + "strings" + + "github.com/gopherjs/gopherjs/compiler/astutil" + "github.com/gopherjs/gopherjs/compiler/internal/analysis" + "github.com/gopherjs/gopherjs/compiler/internal/typeparams" + "github.com/gopherjs/gopherjs/compiler/typesutil" +) + +// nestedFunctionContext creates a new nested context for a function corresponding +// to the provided info and instance. +func (fc *funcContext) nestedFunctionContext(info *analysis.FuncInfo, inst typeparams.Instance) *funcContext { + if info == nil { + panic(errors.New("missing *analysis.FuncInfo")) + } + if inst.Object == nil { + panic(errors.New("missing inst.Object")) + } + o := inst.Object.(*types.Func) + sig := o.Type().(*types.Signature) + + c := &funcContext{ + FuncInfo: info, + instance: inst, + pkgCtx: fc.pkgCtx, + parent: fc, + allVars: make(map[string]int, len(fc.allVars)), + localVars: []string{}, + flowDatas: map[*types.Label]*flowData{nil: {}}, + caseCounter: 1, + labelCases: make(map[*types.Label]int), + typeResolver: fc.typeResolver, + objectNames: map[types.Object]string{}, + sig: &typesutil.Signature{Sig: sig}, + } + for k, v := range fc.allVars { + c.allVars[k] = v + } + + if sig.TypeParams().Len() > 0 { + c.typeResolver = typeparams.NewResolver(c.pkgCtx.typesCtx, sig.TypeParams(), inst.TArgs, nil) + } else if sig.RecvTypeParams().Len() > 0 { + c.typeResolver = typeparams.NewResolver(c.pkgCtx.typesCtx, sig.RecvTypeParams(), inst.TArgs, nil) + } + if c.objectNames == nil { + c.objectNames = map[types.Object]string{} + } + + // Synthesize an identifier by which the function may reference itself. Since + // it appears in the stack trace, it's useful to include the receiver type in + // it. + funcRef := o.Name() + if recvType := typesutil.RecvType(sig); recvType != nil { + funcRef = recvType.Obj().Name() + midDot + funcRef + } + c.funcRef = c.newVariable(funcRef, true /*pkgLevel*/) + + return c +} + +// namedFuncContext creates a new funcContext for a named Go function +// (standalone or method). +func (fc *funcContext) namedFuncContext(inst typeparams.Instance) *funcContext { + info := fc.pkgCtx.FuncInfo(inst) + c := fc.nestedFunctionContext(info, inst) + + return c +} + +// literalFuncContext creates a new funcContext for a function literal. Since +// go/types doesn't generate *types.Func objects for function literals, we +// generate a synthetic one for it. +func (fc *funcContext) literalFuncContext(fun *ast.FuncLit) *funcContext { + info := fc.pkgCtx.FuncLitInfo(fun, fc.TypeArgs()) + sig := fc.pkgCtx.TypeOf(fun).(*types.Signature) + o := types.NewFunc(fun.Pos(), fc.pkgCtx.Pkg, fc.newLitFuncName(), sig) + inst := typeparams.Instance{Object: o} + + c := fc.nestedFunctionContext(info, inst) + return c +} + +// translateTopLevelFunction translates a top-level function declaration +// (standalone function or method) into a corresponding JS function. Must be +// called on the function context created for the function corresponding instance. +// +// Returns a string with JavaScript statements that define the function or +// method. For methods it returns declarations for both value- and +// pointer-receiver (if appropriate). +func (fc *funcContext) translateTopLevelFunction(fun *ast.FuncDecl) []byte { + if fun.Recv == nil { + return fc.translateStandaloneFunction(fun) + } + + return fc.translateMethod(fun) +} + +// translateStandaloneFunction translates a package-level function. +// +// It returns JS statements which define the corresponding function in a +// package context. Exported functions are also assigned to the `$pkg` object. +func (fc *funcContext) translateStandaloneFunction(fun *ast.FuncDecl) []byte { + o := fc.instance.Object.(*types.Func) + + if fun.Recv != nil { + panic(fmt.Errorf("expected standalone function, got method: %s", o)) + } + + lvalue := fc.instName(fc.instance) + + if fun.Body == nil { + return []byte(fmt.Sprintf("\t%s = %s;\n", lvalue, fc.unimplementedFunction(o))) + } + + body := fc.translateFunctionBody(fun.Type, nil, fun.Body) + code := bytes.NewBuffer(nil) + fmt.Fprintf(code, "\t%s = %s;\n", lvalue, body) + if fun.Name.IsExported() { + fmt.Fprintf(code, "\t$pkg.%s = %s;\n", encodeIdent(fun.Name.Name), lvalue) + } + return code.Bytes() +} + +// translateMethod translates a named type method. +// +// It returns one or more JS statements which define the method. Methods with +// non-pointer receiver are automatically defined for the pointer-receiver type. +func (fc *funcContext) translateMethod(fun *ast.FuncDecl) []byte { + o := fc.instance.Object.(*types.Func) + funName := fc.methodName(o) + + // primaryFunction generates a JS function equivalent of the current Go function + // and assigns it to the JS expression defined by lvalue. + primaryFunction := func(lvalue string) []byte { + if fun.Body == nil { + return []byte(fmt.Sprintf("\t%s = %s;\n", lvalue, fc.unimplementedFunction(o))) + } + + var recv *ast.Ident + if fun.Recv != nil && fun.Recv.List[0].Names != nil { + recv = fun.Recv.List[0].Names[0] + } + fun := fc.translateFunctionBody(fun.Type, recv, fun.Body) + return []byte(fmt.Sprintf("\t%s = %s;\n", lvalue, fun)) + } + + recvInst := fc.instance.Recv() + recvInstName := fc.instName(recvInst) + recvType := recvInst.Object.Type().(*types.Named) + + // Objects the method should be assigned to for the plain and pointer type + // of the receiver. + prototypeVar := fmt.Sprintf("%s.prototype.%s", recvInstName, funName) + ptrPrototypeVar := fmt.Sprintf("$ptrType(%s).prototype.%s", recvInstName, funName) + + // Methods with pointer-receiver are only attached to the pointer-receiver type. + if _, isPointer := fc.sig.Sig.Recv().Type().(*types.Pointer); isPointer { + return primaryFunction(ptrPrototypeVar) + } + + // Methods with non-pointer receivers must be defined both for the pointer + // and non-pointer types. To minimize generated code size, we generate a + // complete implementation for only one receiver (non-pointer for most types) + // and define a proxy function on the other, which converts the receiver type + // and forwards the call to the primary implementation. + proxyFunction := func(lvalue, receiver string) []byte { + fun := fmt.Sprintf("function(...$args) { return %s.%s(...$args); }", receiver, funName) + return []byte(fmt.Sprintf("\t%s = %s;\n", lvalue, fun)) + } + + // Structs are a special case: they are represented by JS objects and their + // methods are the underlying object's methods. Due to reference semantics of + // the JS variables, the actual backing object is considered to represent the + // pointer-to-struct type, and methods are attacher to it first and foremost. + if _, isStruct := recvType.Underlying().(*types.Struct); isStruct { + code := bytes.Buffer{} + code.Write(primaryFunction(ptrPrototypeVar)) + code.Write(proxyFunction(prototypeVar, "this.$val")) + return code.Bytes() + } + + // Methods defined for non-pointer receiver are attached to both pointer- and + // non-pointer-receiver types. + proxyRecvExpr := "this.$get()" + if isWrapped(recvType) { + proxyRecvExpr = fmt.Sprintf("new %s(%s)", recvInstName, proxyRecvExpr) + } + code := bytes.Buffer{} + code.Write(primaryFunction(prototypeVar)) + code.Write(proxyFunction(ptrPrototypeVar, proxyRecvExpr)) + return code.Bytes() +} + +// unimplementedFunction returns a JS function expression for a Go function +// without a body, which would throw an exception if called. +// +// In Go such functions are either used with a //go:linkname directive or with +// assembler intrinsics, only former of which is supported by GopherJS. +func (fc *funcContext) unimplementedFunction(o *types.Func) string { + return fmt.Sprintf("function() {\n\t\t$throwRuntimeError(\"native function not implemented: %s\");\n\t}", o.FullName()) +} + +// translateFunctionBody translates body of a top-level or literal function. +// +// It returns a JS function expression that represents the given Go function. +// Function receiver must have been created with nestedFunctionContext() to have +// required metadata set up. +func (fc *funcContext) translateFunctionBody(typ *ast.FuncType, recv *ast.Ident, body *ast.BlockStmt) string { + prevEV := fc.pkgCtx.escapingVars + + // Generate a list of function argument variables. Since Go allows nameless + // arguments, we have to generate synthetic names for their JS counterparts. + var args []string + for _, param := range typ.Params.List { + if len(param.Names) == 0 { + args = append(args, fc.newLocalVariable("param")) + continue + } + for _, ident := range param.Names { + if isBlank(ident) { + args = append(args, fc.newLocalVariable("param")) + continue + } + args = append(args, fc.objectName(fc.pkgCtx.Defs[ident])) + } + } + + bodyOutput := string(fc.CatchOutput(1, func() { + if fc.IsBlocking() { + fc.pkgCtx.Scopes[body] = fc.pkgCtx.Scopes[typ] + fc.handleEscapingVars(body) + } + + if fc.sig != nil && fc.sig.HasNamedResults() { + fc.resultNames = make([]ast.Expr, fc.sig.Sig.Results().Len()) + for i := 0; i < fc.sig.Sig.Results().Len(); i++ { + result := fc.sig.Sig.Results().At(i) + typ := fc.typeResolver.Substitute(result.Type()) + fc.Printf("%s = %s;", fc.objectName(result), fc.translateExpr(fc.zeroValue(typ)).String()) + id := ast.NewIdent("") + fc.pkgCtx.Uses[id] = result + fc.resultNames[i] = fc.setType(id, typ) + } + } + + if recv != nil && !isBlank(recv) { + this := "this" + if isWrapped(fc.typeOf(recv)) { + this = "this.$val" // Unwrap receiver value. + } + fc.Printf("%s = %s;", fc.translateExpr(recv), this) + } + + fc.translateStmtList(body.List) + if len(fc.Flattened) != 0 && !astutil.EndsWithReturn(body.List) { + fc.translateStmt(&ast.ReturnStmt{}, nil) + } + })) + + sort.Strings(fc.localVars) + + var prefix, suffix string + + if len(fc.Flattened) != 0 { + // $s contains an index of the switch case a blocking function reached + // before getting blocked. When execution resumes, it will allow to continue + // from where we left off. + fc.localVars = append(fc.localVars, "$s") + prefix = prefix + " $s = $s || 0;" + } + + if fc.HasDefer { + fc.localVars = append(fc.localVars, "$deferred") + suffix = " }" + suffix + if fc.IsBlocking() { + suffix = " }" + suffix + } + } + + localVarDefs := "" // Function-local var declaration at the top. + + if fc.IsBlocking() { + localVars := append([]string{}, fc.localVars...) + // There are several special variables involved in handling blocking functions: + // $r is sometimes used as a temporary variable to store blocking call result. + // $c indicates that a function is being resumed after a blocking call when set to true. + // $f is an object used to save and restore function context for blocking calls. + localVars = append(localVars, "$r") + // funcRef identifies the function object itself, so it doesn't need to be saved + // or restored. + localVars = removeMatching(localVars, fc.funcRef) + // If a blocking function is being resumed, initialize local variables from the saved context. + localVarDefs = fmt.Sprintf("var {%s, $c} = $restore(this, {%s});\n", strings.Join(localVars, ", "), strings.Join(args, ", ")) + // If the function gets blocked, save local variables for future. + saveContext := fmt.Sprintf("var $f = {$blk: "+fc.funcRef+", $c: true, $r, %s};", strings.Join(fc.localVars, ", ")) + + suffix = " " + saveContext + "return $f;" + suffix + } else if len(fc.localVars) > 0 { + // Non-blocking functions simply declare local variables with no need for restore support. + localVarDefs = fmt.Sprintf("var %s;\n", strings.Join(fc.localVars, ", ")) + } + + if fc.HasDefer { + prefix = prefix + " var $err = null; try {" + deferSuffix := " } catch(err) { $err = err;" + if fc.IsBlocking() { + deferSuffix += " $s = -1;" + } + if fc.resultNames == nil && fc.sig.HasResults() { + deferSuffix += fmt.Sprintf(" return%s;", fc.translateResults(nil)) + } + deferSuffix += " } finally { $callDeferred($deferred, $err);" + if fc.resultNames != nil { + deferSuffix += fmt.Sprintf(" if (!$curGoroutine.asleep) { return %s; }", fc.translateResults(fc.resultNames)) + } + if fc.IsBlocking() { + deferSuffix += " if($curGoroutine.asleep) {" + } + suffix = deferSuffix + suffix + } + + if len(fc.Flattened) != 0 { + prefix = prefix + " s: while (true) { switch ($s) { case 0:" + suffix = " } return; }" + suffix + } + + if fc.HasDefer { + prefix = prefix + " $deferred = []; $curGoroutine.deferStack.push($deferred);" + } + + if prefix != "" { + bodyOutput = fc.Indentation(1) + "/* */" + prefix + "\n" + bodyOutput + } + if suffix != "" { + bodyOutput = bodyOutput + fc.Indentation(1) + "/* */" + suffix + "\n" + } + if localVarDefs != "" { + bodyOutput = fc.Indentation(1) + localVarDefs + bodyOutput + } + + fc.pkgCtx.escapingVars = prevEV + + return fmt.Sprintf("function %s(%s) {\n%s%s}", fc.funcRef, strings.Join(args, ", "), bodyOutput, fc.Indentation(0)) +} diff --git a/compiler/gopherjspkg/doc.go b/compiler/gopherjspkg/doc.go index f57e84f74..e772ae192 100644 --- a/compiler/gopherjspkg/doc.go +++ b/compiler/gopherjspkg/doc.go @@ -4,9 +4,6 @@ // operation. They are needed to build the Go standard library with GopherJS. // Currently, they include: // -// github.com/gopherjs/gopherjs/js -// github.com/gopherjs/gopherjs/nosync -// +// github.com/gopherjs/gopherjs/js +// github.com/gopherjs/gopherjs/nosync package gopherjspkg - -//go:generate vfsgendev -source="github.com/gopherjs/gopherjs/compiler/gopherjspkg".FS -tag=gopherjsdev diff --git a/compiler/gopherjspkg/fs.go b/compiler/gopherjspkg/fs.go index f6fb2622d..0ec155308 100644 --- a/compiler/gopherjspkg/fs.go +++ b/compiler/gopherjspkg/fs.go @@ -1,31 +1,13 @@ -// +build gopherjsdev - package gopherjspkg import ( - "go/build" - "log" "net/http" - "os" - pathpkg "path" - - "github.com/shurcooL/httpfs/filter" ) // FS is a virtual filesystem that contains core GopherJS packages. -var FS = filter.Keep( - http.Dir(importPathToDir("github.com/gopherjs/gopherjs")), - func(path string, fi os.FileInfo) bool { - return path == "/" || - path == "/js" || (pathpkg.Dir(path) == "/js" && !fi.IsDir()) || - path == "/nosync" || (pathpkg.Dir(path) == "/nosync" && !fi.IsDir()) - }, -) +var FS http.FileSystem -func importPathToDir(importPath string) string { - p, err := build.Import(importPath, "", build.FindOnly) - if err != nil { - log.Fatalln(err) - } - return p.Dir +// RegisterFS allows setting the embedded fs from another package. +func RegisterFS(fs http.FileSystem) { + FS = fs } diff --git a/compiler/gopherjspkg/fs_vfsdata.go b/compiler/gopherjspkg/fs_vfsdata.go deleted file mode 100644 index b21d6e838..000000000 --- a/compiler/gopherjspkg/fs_vfsdata.go +++ /dev/null @@ -1,232 +0,0 @@ -// Code generated by vfsgen; DO NOT EDIT. - -// +build !gopherjsdev - -package gopherjspkg - -import ( - "bytes" - "compress/gzip" - "fmt" - "io" - "io/ioutil" - "net/http" - "os" - pathpkg "path" - "time" -) - -// FS is a virtual filesystem that contains core GopherJS packages. -var FS = func() http.FileSystem { - fs := vfsgen۰FS{ - "/": &vfsgen۰DirInfo{ - name: "/", - modTime: time.Date(2019, 4, 25, 16, 19, 34, 225618757, time.UTC), - }, - "/js": &vfsgen۰DirInfo{ - name: "js", - modTime: time.Date(2019, 3, 10, 16, 38, 53, 764271817, time.UTC), - }, - "/js/js.go": &vfsgen۰CompressedFileInfo{ - name: "js.go", - modTime: time.Date(2019, 3, 10, 16, 38, 53, 764987009, time.UTC), - uncompressedSize: 8002, - - compressedContent: 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- }, - } - fs["/"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/js"].(os.FileInfo), - fs["/nosync"].(os.FileInfo), - } - fs["/js"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/js/js.go"].(os.FileInfo), - } - fs["/nosync"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/nosync/map.go"].(os.FileInfo), - fs["/nosync/mutex.go"].(os.FileInfo), - fs["/nosync/once.go"].(os.FileInfo), - fs["/nosync/pool.go"].(os.FileInfo), - } - - return fs -}() - -type vfsgen۰FS map[string]interface{} - -func (fs vfsgen۰FS) Open(path string) (http.File, error) { - path = pathpkg.Clean("/" + path) - f, ok := fs[path] - if !ok { - return nil, &os.PathError{Op: "open", Path: path, Err: os.ErrNotExist} - } - - switch f := f.(type) { - case *vfsgen۰CompressedFileInfo: - gr, err := gzip.NewReader(bytes.NewReader(f.compressedContent)) - if err != nil { - // This should never happen because we generate the gzip bytes such that they are always valid. - panic("unexpected error reading own gzip compressed bytes: " + err.Error()) - } - return &vfsgen۰CompressedFile{ - vfsgen۰CompressedFileInfo: f, - gr: gr, - }, nil - case *vfsgen۰DirInfo: - return &vfsgen۰Dir{ - vfsgen۰DirInfo: f, - }, nil - default: - // This should never happen because we generate only the above types. - panic(fmt.Sprintf("unexpected type %T", f)) - } -} - -// vfsgen۰CompressedFileInfo is a static definition of a gzip compressed file. -type vfsgen۰CompressedFileInfo struct { - name string - modTime time.Time - compressedContent []byte - uncompressedSize int64 -} - -func (f *vfsgen۰CompressedFileInfo) Readdir(count int) ([]os.FileInfo, error) { - return nil, fmt.Errorf("cannot Readdir from file %s", f.name) -} -func (f *vfsgen۰CompressedFileInfo) Stat() (os.FileInfo, error) { return f, nil } - -func (f *vfsgen۰CompressedFileInfo) GzipBytes() []byte { - return f.compressedContent -} - -func (f *vfsgen۰CompressedFileInfo) Name() string { return f.name } -func (f *vfsgen۰CompressedFileInfo) Size() int64 { return f.uncompressedSize } -func (f *vfsgen۰CompressedFileInfo) Mode() os.FileMode { return 0444 } -func (f *vfsgen۰CompressedFileInfo) ModTime() time.Time { return f.modTime } -func (f *vfsgen۰CompressedFileInfo) IsDir() bool { return false } -func (f *vfsgen۰CompressedFileInfo) Sys() interface{} { return nil } - -// vfsgen۰CompressedFile is an opened compressedFile instance. -type vfsgen۰CompressedFile struct { - *vfsgen۰CompressedFileInfo - gr *gzip.Reader - grPos int64 // Actual gr uncompressed position. - seekPos int64 // Seek uncompressed position. -} - -func (f *vfsgen۰CompressedFile) Read(p []byte) (n int, err error) { - if f.grPos > f.seekPos { - // Rewind to beginning. - err = f.gr.Reset(bytes.NewReader(f.compressedContent)) - if err != nil { - return 0, err - } - f.grPos = 0 - } - if f.grPos < f.seekPos { - // Fast-forward. - _, err = io.CopyN(ioutil.Discard, f.gr, f.seekPos-f.grPos) - if err != nil { - return 0, err - } - f.grPos = f.seekPos - } - n, err = f.gr.Read(p) - f.grPos += int64(n) - f.seekPos = f.grPos - return n, err -} -func (f *vfsgen۰CompressedFile) Seek(offset int64, whence int) (int64, error) { - switch whence { - case io.SeekStart: - f.seekPos = 0 + offset - case io.SeekCurrent: - f.seekPos += offset - case io.SeekEnd: - f.seekPos = f.uncompressedSize + offset - default: - panic(fmt.Errorf("invalid whence value: %v", whence)) - } - return f.seekPos, nil -} -func (f *vfsgen۰CompressedFile) Close() error { - return f.gr.Close() -} - -// vfsgen۰DirInfo is a static definition of a directory. -type vfsgen۰DirInfo struct { - name string - modTime time.Time - entries []os.FileInfo -} - -func (d *vfsgen۰DirInfo) Read([]byte) (int, error) { - return 0, fmt.Errorf("cannot Read from directory %s", d.name) -} -func (d *vfsgen۰DirInfo) Close() error { return nil } -func (d *vfsgen۰DirInfo) Stat() (os.FileInfo, error) { return d, nil } - -func (d *vfsgen۰DirInfo) Name() string { return d.name } -func (d *vfsgen۰DirInfo) Size() int64 { return 0 } -func (d *vfsgen۰DirInfo) Mode() os.FileMode { return 0755 | os.ModeDir } -func (d *vfsgen۰DirInfo) ModTime() time.Time { return d.modTime } -func (d *vfsgen۰DirInfo) IsDir() bool { return true } -func (d *vfsgen۰DirInfo) Sys() interface{} { return nil } - -// vfsgen۰Dir is an opened dir instance. -type vfsgen۰Dir struct { - *vfsgen۰DirInfo - pos int // Position within entries for Seek and Readdir. -} - -func (d *vfsgen۰Dir) Seek(offset int64, whence int) (int64, error) { - if offset == 0 && whence == io.SeekStart { - d.pos = 0 - return 0, nil - } - return 0, fmt.Errorf("unsupported Seek in directory %s", d.name) -} - -func (d *vfsgen۰Dir) Readdir(count int) ([]os.FileInfo, error) { - if d.pos >= len(d.entries) && count > 0 { - return nil, io.EOF - } - if count <= 0 || count > len(d.entries)-d.pos { - count = len(d.entries) - d.pos - } - e := d.entries[d.pos : d.pos+count] - d.pos += count - return e, nil -} diff --git a/compiler/analysis/bool.go b/compiler/internal/analysis/bool.go similarity index 100% rename from compiler/analysis/bool.go rename to compiler/internal/analysis/bool.go diff --git a/compiler/analysis/break.go b/compiler/internal/analysis/break.go similarity index 100% rename from compiler/analysis/break.go rename to compiler/internal/analysis/break.go diff --git a/compiler/internal/analysis/defer.go b/compiler/internal/analysis/defer.go new file mode 100644 index 000000000..5d4f151a3 --- /dev/null +++ b/compiler/internal/analysis/defer.go @@ -0,0 +1,101 @@ +package analysis + +import ( + "go/ast" + "go/types" + + "github.com/gopherjs/gopherjs/compiler/internal/typeparams" + "github.com/gopherjs/gopherjs/compiler/typesutil" +) + +// deferStmt represents a defer statement that is blocking or not. +// +// A blocking defer statement will cause a return statement to be blocking +// since the defer is called and potentially blocked while leaving the method. +// We try to determine which defers affect which returns so that we only +// mark returns as blocking if they are affected by a blocking defer. +// In general we know that a defer will affect all returns that have been +// declared after the defer statement. +// +// Since analysis doesn't create [CFG] basic blocks for full control +// flow analysis we can't easily determine several cases: +// +// - Terminating if-statements(i.e. does the body of the if-statement always +// return from the method) are difficult to determine. Any defer that is +// added whilst inside a terminating if-statement body can only affect the +// returns inside that if-statement body. +// Otherwise, the defer may affect returns after the if-statement block has +// rejoined the flow that it branched from. Since terminating if-statements +// are difficult to determine without [CFG] blocks, we treat all +// if-statements as if they are not terminating. +// That means there may be some false positives, since returns declared +// after a terminating branch will be marked as affected by a defer +// declared in that branch, when in reality they are not. +// +// - Same as above but for else blocks, switch cases, and any branching. +// +// - Loops (i.e. for-statements and for-range-statements) can cause return +// statements declared earlier in the loop to be affected by defers +// declared after it in the loop. We can't determine which branches in a +// loop may return to the start of the loop so we assume anywhere inside +// of a loop can return to the start of the loop. +// To handle this, all defers defined anywhere within a loop are assumed +// to affect any return also defined in that loop. +// We only need to track the top-level loop since nested loops will be +// superseded by the top-level loop. +// +// - Labels and goto's are similar to loops in [CFG] blocks but without those +// blocks it's harder to determine which defers will affect which returns. +// To be safe, for any function with any blocking defers, returns, and +// goto's, all the returns are defaulted to blocking. +// +// [CFG]: https://en.wikipedia.org/wiki/Control-flow_graph +type deferStmt struct { + obj types.Object + lit *ast.FuncLit + typeArgs typesutil.TypeList +} + +// newBlockingDefer creates a new defer statement that is blocking. +// +// If the defer is calling a js.Object method then the defer is non-blocking. +// If the defers calling an interface method or function pointer in a var +// then the defer is blocking. +func newBlockingDefer() *deferStmt { + return &deferStmt{} +} + +// newInstDefer creates a new defer statement for an instances of a method. +// The instance is used to look up the blocking information later. +func newInstDefer(inst typeparams.Instance) *deferStmt { + return &deferStmt{obj: inst.Object, typeArgs: inst.TArgs} +} + +// newLitDefer creates a new defer statement for a function literal. +// The literal is used to look up the blocking information later. +func newLitDefer(lit *ast.FuncLit, typeArgs typesutil.TypeList) *deferStmt { + return &deferStmt{lit: lit, typeArgs: typeArgs} +} + +// IsBlocking determines if the defer statement is blocking or not. +func (d *deferStmt) IsBlocking(info *Info) bool { + // If the object or the literal is set then we can look up the blocking, + // otherwise assume blocking because otherwise the defer wouldn't + // have been recorded. + if d.obj != nil { + return info.IsBlocking(typeparams.Instance{Object: d.obj, TArgs: d.typeArgs}) + } + if d.lit != nil { + return info.FuncLitInfo(d.lit, d.typeArgs).IsBlocking() + } + return true +} + +func isAnyDeferBlocking(deferStmts []*deferStmt, info *Info) bool { + for _, def := range deferStmts { + if def.IsBlocking(info) { + return true + } + } + return false +} diff --git a/compiler/analysis/escape.go b/compiler/internal/analysis/escape.go similarity index 88% rename from compiler/analysis/escape.go rename to compiler/internal/analysis/escape.go index 2807ecf64..4209fca6c 100644 --- a/compiler/analysis/escape.go +++ b/compiler/internal/analysis/escape.go @@ -14,16 +14,13 @@ func EscapingObjects(n ast.Node, info *types.Info) []*types.Var { bottomScopes: make(map[*types.Scope]bool), } ast.Walk(&v, n) - var list []*types.Var - for obj := range v.escaping { - list = append(list, obj) - } - return list + return v.ordered } type escapeAnalysis struct { info *types.Info escaping map[*types.Var]bool + ordered []*types.Var topScope *types.Scope bottomScopes map[*types.Scope]bool } @@ -57,7 +54,10 @@ func (v *escapingObjectCollector) Visit(node ast.Node) (w ast.Visitor) { if obj, ok := v.analysis.info.Uses[id].(*types.Var); ok { for s := obj.Parent(); s != nil; s = s.Parent() { if s == v.analysis.topScope { - v.analysis.escaping[obj] = true + if !v.analysis.escaping[obj] { + v.analysis.escaping[obj] = true + v.analysis.ordered = append(v.analysis.ordered, obj) + } break } if v.analysis.bottomScopes[s] { diff --git a/compiler/internal/analysis/info.go b/compiler/internal/analysis/info.go new file mode 100644 index 000000000..e400c870c --- /dev/null +++ b/compiler/internal/analysis/info.go @@ -0,0 +1,714 @@ +package analysis + +import ( + "fmt" + "go/ast" + "go/token" + "go/types" + "strings" + + "github.com/gopherjs/gopherjs/compiler/astutil" + "github.com/gopherjs/gopherjs/compiler/internal/typeparams" + "github.com/gopherjs/gopherjs/compiler/typesutil" +) + +type continueStmt struct { + forStmt *ast.ForStmt + analyzeStack astPath +} + +func newContinueStmt(forStmt *ast.ForStmt, stack astPath) continueStmt { + cs := continueStmt{ + forStmt: forStmt, + analyzeStack: stack.copy(), + } + return cs +} + +// astPath is a list of AST nodes where each previous node is a parent of the +// next node. +type astPath []ast.Node + +func (src astPath) copy() astPath { + dst := make(astPath, len(src)) + copy(dst, src) + return dst +} + +func (ap astPath) String() string { + s := &strings.Builder{} + s.WriteString("[") + for i, n := range ap { + if i > 0 { + s.WriteString(", ") + } + fmt.Fprintf(s, "%T(%p)", n, n) + } + s.WriteString("]") + return s.String() +} + +type Info struct { + *types.Info + Pkg *types.Package + typeCtx *types.Context + InstanceSets *typeparams.PackageInstanceSets + HasPointer map[*types.Var]bool + funcInstInfos *typeparams.InstanceMap[*FuncInfo] + funcLitInfos map[*ast.FuncLit][]*FuncInfo + InitFuncInfo *FuncInfo // Context for package variable initialization. + + infoImporter InfoImporter // To get `Info` for other packages. + allInfos []*FuncInfo +} + +// InfoImporter is used to get the `Info` for another package. +// The path is the resolved import path of the package to get the `Info` for. +type InfoImporter func(path string) (*Info, error) + +func (info *Info) newFuncInfo(n ast.Node, obj types.Object, typeArgs typesutil.TypeList, resolver *typeparams.Resolver) *FuncInfo { + funcInfo := &FuncInfo{ + pkgInfo: info, + Flattened: make(map[ast.Node]bool), + Blocking: make(map[ast.Node]bool), + GotoLabel: make(map[*types.Label]bool), + loopReturnIndex: -1, + instCallees: new(typeparams.InstanceMap[[]astPath]), + literalFuncCallees: make(map[*ast.FuncLit]astPath), + typeArgs: typeArgs, + resolver: resolver, + } + + // Register the function in the appropriate map. + switch n := n.(type) { + case *ast.FuncDecl: + if n.Body == nil { + // Function body comes from elsewhere (for example, from a go:linkname + // directive), conservatively assume that it may be blocking. + // TODO(nevkontakte): It is possible to improve accuracy of this detection. + // Since GopherJS supports only "import-style" go:linkname, at this stage + // the compiler already determined whether the implementation function is + // blocking, and we could check that. + funcInfo.Blocking[n] = true + } + + if obj == nil { + obj = info.Defs[n.Name] + } + inst := typeparams.Instance{Object: obj, TArgs: typeArgs} + info.funcInstInfos.Set(inst, funcInfo) + + case *ast.FuncLit: + info.funcLitInfos[n] = append(info.funcLitInfos[n], funcInfo) + } + + // And add it to the list of all functions. + info.allInfos = append(info.allInfos, funcInfo) + + return funcInfo +} + +func (info *Info) newFuncInfoInstances(fd *ast.FuncDecl) []*FuncInfo { + obj := info.Defs[fd.Name] + instances := info.InstanceSets.Pkg(info.Pkg).ForObj(obj) + if len(instances) == 0 { + if typeparams.HasTypeParams(obj.Type()) { + // This is a generic function, but no instances were found, + // this is an unused function, so skip over it. + return []*FuncInfo{} + } + + // No instances found and this is a non-generic function. + return []*FuncInfo{info.newFuncInfo(fd, nil, nil, nil)} + } + + funcInfos := make([]*FuncInfo, 0, len(instances)) + for _, inst := range instances { + var resolver *typeparams.Resolver + if sig, ok := obj.Type().(*types.Signature); ok { + tp := typeparams.SignatureTypeParams(sig) + resolver = typeparams.NewResolver(info.typeCtx, tp, inst.TArgs, nil) + } + fi := info.newFuncInfo(fd, inst.Object, inst.TArgs, resolver) + funcInfos = append(funcInfos, fi) + } + return funcInfos +} + +// IsBlocking returns true if the function may contain blocking calls or operations. +// If inst is from a different package, this will use the getImportInfo function +// to lookup the information from the other package. +func (info *Info) IsBlocking(inst typeparams.Instance) bool { + if inst.Object.Pkg() != info.Pkg { + path := inst.Object.Pkg().Path() + otherInfo, err := info.infoImporter(path) + if err != nil { + panic(fmt.Errorf(`failed to get info for package %q: %v`, path, err)) + } + return otherInfo.IsBlocking(inst) + } + if funInfo := info.FuncInfo(inst); funInfo != nil { + return funInfo.IsBlocking() + } + panic(fmt.Errorf(`info did not have function declaration instance for %q`, inst.TypeString())) +} + +// FuncInfo returns information about the given function declaration instance, or nil if not found. +func (info *Info) FuncInfo(inst typeparams.Instance) *FuncInfo { + return info.funcInstInfos.Get(inst) +} + +// FuncLitInfo returns information about the given function literal, or nil if not found. +// The given type arguments are used to identify the correct instance of the +// function literal in the case the literal was defined inside a generic function. +func (info *Info) FuncLitInfo(fun *ast.FuncLit, typeArgs typesutil.TypeList) *FuncInfo { + lits := info.funcLitInfos[fun] + for _, fi := range lits { + if fi.typeArgs.Equal(typeArgs) { + return fi + } + } + return nil +} + +// VarsWithInitializers returns a set of package-level variables that have +// explicit initializers. +func (info *Info) VarsWithInitializers() map[*types.Var]bool { + result := map[*types.Var]bool{} + for _, init := range info.InitOrder { + for _, o := range init.Lhs { + result[o] = true + } + } + return result +} + +// AnalyzePkg analyzes the given package for blocking calls, defers, etc. +// +// Note that at the end of this call the analysis information +// has NOT been propagated across packages yet. Once all the packages +// have been analyzed, call PropagateAnalysis to propagate the information. +func AnalyzePkg(files []*ast.File, fileSet *token.FileSet, typesInfo *types.Info, typeCtx *types.Context, typesPkg *types.Package, instanceSets *typeparams.PackageInstanceSets, infoImporter InfoImporter) *Info { + info := &Info{ + Info: typesInfo, + Pkg: typesPkg, + typeCtx: typeCtx, + InstanceSets: instanceSets, + HasPointer: make(map[*types.Var]bool), + infoImporter: infoImporter, + funcInstInfos: new(typeparams.InstanceMap[*FuncInfo]), + funcLitInfos: make(map[*ast.FuncLit][]*FuncInfo), + } + info.InitFuncInfo = info.newFuncInfo(nil, nil, nil, nil) + + // Traverse the full AST of the package and collect information about existing + // functions. + for _, file := range files { + ast.Walk(info.InitFuncInfo, file) + } + + return info +} + +// PropagateAnalysis will propagate analysis information across package +// boundaries to finish the analysis of a whole project. +func PropagateAnalysis(allInfo []*Info) { + done := false + for !done { + done = true + for _, info := range allInfo { + if !info.propagateFunctionBlocking() { + done = false + } + } + } + + for _, info := range allInfo { + info.propagateControlStatementBlocking() + } +} + +// propagateFunctionBlocking propagates information about blocking calls +// to the caller functions. Returns true if done, false if more iterations +// are needed. +// +// For each function we check all other functions it may call and if any of +// them are blocking, we mark the caller blocking as well. The process is +// repeated until no new blocking functions is detected. +func (info *Info) propagateFunctionBlocking() bool { + done := true + for _, caller := range info.allInfos { + // Check calls to named functions and function-typed variables. + caller.instCallees.Iterate(func(callee typeparams.Instance, callSites []astPath) { + if info.IsBlocking(callee) { + for _, callSite := range callSites { + caller.markBlocking(callSite) + } + caller.instCallees.Delete(callee) + done = false + } + }) + + // Check direct calls to function literals. + for callee, callSite := range caller.literalFuncCallees { + if info.FuncLitInfo(callee, caller.typeArgs).IsBlocking() { + caller.markBlocking(callSite) + delete(caller.literalFuncCallees, callee) + done = false + } + } + } + return done +} + +// propagateControlStatementBlocking is called after all function blocking +// information was propagated, mark flow control statements as blocking +// whenever they may lead to a blocking function call. +func (info *Info) propagateControlStatementBlocking() { + for _, funcInfo := range info.allInfos { + funcInfo.propagateReturnBlocking() + funcInfo.propagateContinueBlocking() + } +} + +type FuncInfo struct { + // HasDefer indicates if any defer statement exists in the function. + HasDefer bool + // Nodes are "flattened" into a switch-case statement when we need to be able + // to jump into an arbitrary position in the code with a GOTO statement, or + // resume a goroutine after a blocking call unblocks. + Flattened map[ast.Node]bool + // Blocking indicates that either the AST node itself or its descendant may + // block goroutine execution (for example, a channel operation). + Blocking map[ast.Node]bool + // GotoLabel indicates a label referenced by a goto statement, rather than a + // named loop. + GotoLabel map[*types.Label]bool + // List of continue statements in the function. + continueStmts []continueStmt + // List of return statements in the function. + returnStmts []returnStmt + // List of deferred function calls which could be blocking. + // This is built up as the function is analyzed so that we can mark all + // return statements with the defers that each return would need to call. + deferStmts []*deferStmt + // The index of the return statement that was analyzed prior to a top-level + // loop starting. This is used to determine which return statements + // were added within the loop so that they can be updated to reflect all + // the defers that were added anywhere inside the loop. This is because + // returns defined before any defers in a loop may still be affected by + // those defers because of the loop. See comment on [deferStmt]. + loopReturnIndex int + // List of other named functions in the current package or another package + // that this function calls. + // If any of them are blocking, this function will become blocking too. + instCallees *typeparams.InstanceMap[[]astPath] + // List of function literals directly called from this function (for example: + // `func() { /* do stuff */ }()`). This is distinct from function literals + // assigned to named variables (for example: `doStuff := func() {}; + // doStuff()`), which are handled by localInstCallees. If any of them are + // identified as blocking, this function will become blocking too. + literalFuncCallees map[*ast.FuncLit]astPath + // typeArgs are the type arguments for the function instance. + typeArgs typesutil.TypeList + // resolver is used by this function instance to resolve any type arguments + // for internal function calls. + // This may be nil if not an instance of a generic function. + resolver *typeparams.Resolver + + pkgInfo *Info // Function's parent package. + visitorStack astPath +} + +// IsBlocking indicates if this function may block goroutine execution. +// +// For example, a channel operation in a function or a call to another +// possibly blocking function may block the function. +func (fi *FuncInfo) IsBlocking() bool { + return fi == nil || len(fi.Blocking) != 0 +} + +// TypeArgs gets the type arguments of this inside of a function instance +// or empty if not in a function instance. +func (fi *FuncInfo) TypeArgs() typesutil.TypeList { + return fi.typeArgs +} + +// propagateReturnBlocking updates the blocking on the return statements. +// See comment on [deferStmt]. +// +// This should only be called once when finishing analysis and only after +// all functions have been analyzed and all blocking information has been +// propagated across functions. +func (fi *FuncInfo) propagateReturnBlocking() { + if len(fi.GotoLabel) > 0 { + // If there are any goto statements in the function then + // all the return statements are marked the same. + // If any defer is blocking, then all return statements are blocking. + if isAnyDeferBlocking(fi.deferStmts, fi.pkgInfo) { + for _, returnStmt := range fi.returnStmts { + fi.markBlocking(returnStmt.analyzeStack) + } + } + return + } + + for _, returnStmt := range fi.returnStmts { + // Check all the defer statements that affect the return statement, + // if any are blocking then the return statement is blocking. + if returnStmt.IsBlocking(fi) { + fi.markBlocking(returnStmt.analyzeStack) + } + } +} + +// propagateContinueBlocking updates the blocking on the continue statements. +// +// This should only be called once when finishing analysis and only after +// all functions have been analyzed and all blocking information has been +// propagated across functions. +func (fi *FuncInfo) propagateContinueBlocking() { + for _, continueStmt := range fi.continueStmts { + if fi.Blocking[continueStmt.forStmt.Post] { + // If a for-loop post-expression is blocking, the continue statement + // that leads to it must be treated as blocking. + fi.markBlocking(continueStmt.analyzeStack) + } + } +} + +func (fi *FuncInfo) Visit(node ast.Node) ast.Visitor { + if node == nil { + if len(fi.visitorStack) != 0 { + fi.visitorStack = fi.visitorStack[:len(fi.visitorStack)-1] + } + return nil + } + fi.visitorStack = append(fi.visitorStack, node) + + switch n := node.(type) { + case *ast.FuncDecl: + // Analyze all the instances of the function declarations + // in their own context with their own type arguments. + fis := fi.pkgInfo.newFuncInfoInstances(n) + if n.Body != nil { + for _, fi := range fis { + ast.Walk(fi, n.Body) + } + } + return nil + case *ast.FuncLit: + // Analyze the function literal in its own context. + return fi.pkgInfo.newFuncInfo(n, nil, fi.typeArgs, fi.resolver) + case *ast.BranchStmt: + switch n.Tok { + case token.GOTO: + // Emulating GOTO in JavaScript requires the code to be flattened into a + // switch-statement. + fi.markFlattened(fi.visitorStack) + fi.GotoLabel[fi.pkgInfo.Uses[n.Label].(*types.Label)] = true + case token.CONTINUE: + loopStmt := astutil.FindLoopStmt(fi.visitorStack, n, fi.pkgInfo.Info) + if forStmt, ok := (loopStmt).(*ast.ForStmt); ok { + // In `for x; y; z { ... }` loops `z` may be potentially blocking + // and therefore continue expression that triggers it would have to + // be treated as blocking. + fi.continueStmts = append(fi.continueStmts, newContinueStmt(forStmt, fi.visitorStack)) + } + } + return fi + case *ast.CallExpr: + return fi.visitCallExpr(n, false) + case *ast.SendStmt: + // Sending into a channel is blocking. + fi.markBlocking(fi.visitorStack) + return fi + case *ast.UnaryExpr: + switch n.Op { + case token.AND: + if id, ok := astutil.RemoveParens(n.X).(*ast.Ident); ok { + fi.pkgInfo.HasPointer[fi.pkgInfo.Uses[id].(*types.Var)] = true + } + case token.ARROW: + // Receiving from a channel is blocking. + fi.markBlocking(fi.visitorStack) + } + return fi + case *ast.RangeStmt: + if _, ok := fi.pkgInfo.TypeOf(n.X).Underlying().(*types.Chan); ok { + // for-range loop over a channel is blocking. + fi.markBlocking(fi.visitorStack) + } + if fi.loopReturnIndex >= 0 { + // Already in a loop so just continue walking. + return fi + } + // Top-level for-loop, analyze it separately to be able to update + // returns with the defers that were added inside the loop. + // See comment on deferStmt. + fi.loopReturnIndex = len(fi.returnStmts) + // Analyze the for-loop's children. + ast.Walk(skipParentNode{then: fi}, n) + // After the for-loop is analyzed, update all return statements that + // were inside the loop with the resulting list of defer statements. + for i := fi.loopReturnIndex; i < len(fi.returnStmts); i++ { + fi.returnStmts[i].deferStmts = fi.deferStmts + } + fi.loopReturnIndex = -1 + return nil + case *ast.ForStmt: + if fi.loopReturnIndex >= 0 { + // Already in a loop so just continue walking. + return fi + } + // Top-level for-loop, analyze it separately to be able to update + // returns with the defers that were added inside the loop. + // See comment on deferStmt. + fi.loopReturnIndex = len(fi.returnStmts) + // Analyze the for-loop's children. + ast.Walk(skipParentNode{then: fi}, n) + // After the for-loop is analyzed, update all return statements that + // were inside the loop with the resulting list of defer statements. + for i := fi.loopReturnIndex; i < len(fi.returnStmts); i++ { + fi.returnStmts[i].deferStmts = fi.deferStmts + } + fi.loopReturnIndex = -1 + return nil + case *ast.SelectStmt: + for _, s := range n.Body.List { + if s.(*ast.CommClause).Comm == nil { // default clause + return fi + } + } + // Select statements without a default case are blocking. + fi.markBlocking(fi.visitorStack) + return fi + case *ast.CommClause: + // FIXME(nevkontakte): Does this need to be manually spelled out? Presumably + // ast.Walk would visit all those nodes anyway, and we are not creating any + // new contexts here. + // https://github.com/gopherjs/gopherjs/issues/230 seems to be relevant? + switch comm := n.Comm.(type) { + case *ast.SendStmt: + ast.Walk(fi, comm.Chan) + ast.Walk(fi, comm.Value) + case *ast.ExprStmt: + ast.Walk(fi, comm.X.(*ast.UnaryExpr).X) + case *ast.AssignStmt: + ast.Walk(fi, comm.Rhs[0].(*ast.UnaryExpr).X) + } + for _, s := range n.Body { + ast.Walk(fi, s) + } + return nil // The subtree was manually checked, no need to visit it again. + case *ast.GoStmt: + // Unlike a regular call, the function in a go statement doesn't block the + // caller goroutine, but the expression that determines the function and its + // arguments still need to be checked. + ast.Walk(fi, n.Call.Fun) + for _, arg := range n.Call.Args { + ast.Walk(fi, arg) + } + return nil // The subtree was manually checked, no need to visit it again. + case *ast.DeferStmt: + fi.HasDefer = true + return fi.visitCallExpr(n.Call, true) + case *ast.ReturnStmt: + // Capture all return statements in the function. They could become blocking + // if the function has a blocking deferred call. + rs := newReturnStmt(fi.visitorStack, fi.deferStmts) + fi.returnStmts = append(fi.returnStmts, rs) + return fi + default: + return fi + } + // Deliberately no return here to make sure that each of the cases above is + // self-sufficient and explicitly decides in which context the its AST subtree + // needs to be analyzed. +} + +func (fi *FuncInfo) visitCallExpr(n *ast.CallExpr, deferredCall bool) ast.Visitor { + switch f := astutil.RemoveParens(n.Fun).(type) { + case *ast.Ident: + fi.callToNamedFunc(fi.instanceForIdent(f), deferredCall) + return fi + case *ast.SelectorExpr: + if sel := fi.pkgInfo.Selections[f]; sel != nil { + if typesutil.IsJsObject(sel.Recv()) { + // js.Object methods are known to be non-blocking, + // but we still must check its arguments. + // We don't need to add a deferStmt when `deferredCall` + // is true, since that defer will always be non-blocking. + return fi + } + // selection is a method call like `foo.Bar()`, where `foo` might + // be generic and needs to be substituted with the type argument. + fi.callToNamedFunc(fi.instanceForSelection(sel), deferredCall) + return fi + } + + fi.callToNamedFunc(fi.instanceForIdent(f.Sel), deferredCall) + return fi + case *ast.FuncLit: + // Collect info about the function literal itself. + ast.Walk(fi, n.Fun) + + // Check all argument expressions. + for _, arg := range n.Args { + ast.Walk(fi, arg) + } + // Register literal function call site in case it is identified as blocking. + fi.literalFuncCallees[f] = fi.visitorStack.copy() + if deferredCall { + fi.deferStmts = append(fi.deferStmts, newLitDefer(f, fi.typeArgs)) + } + return nil // No need to walk under this CallExpr, we already did it manually. + case *ast.IndexExpr: + // Collect info about the instantiated type or function, or index expression. + if astutil.IsTypeExpr(f, fi.pkgInfo.Info) { + // This is a type conversion to an instance of a generic type, + // not a call. Type assertion itself is not blocking, but we will + // visit the input expression. + return fi + } + if astutil.IsTypeExpr(f.Index, fi.pkgInfo.Info) { + // This is a call of an instantiation of a generic function, + // e.g. `foo[int]` in `func foo[T any]() { ... }; func main() { foo[int]() }` + fi.callToNamedFunc(fi.instanceForIdent(f.X.(*ast.Ident)), deferredCall) + return fi + } + // The called function is gotten with an index or key from a map, array, or slice. + // e.g. `m := map[string]func(){}; m["key"]()`, `s := []func(); s[0]()`. + // Since we can't predict if the returned function will be blocking + // or not, we have to be conservative and assume that function might be blocking. + fi.markBlocking(fi.visitorStack) + if deferredCall { + fi.deferStmts = append(fi.deferStmts, newBlockingDefer()) + } + return fi + case *ast.IndexListExpr: + // Collect info about the instantiated type or function. + if astutil.IsTypeExpr(f, fi.pkgInfo.Info) { + // This is a type conversion to an instance of a generic type, + // not a call. Type assertion itself is not blocking, but we will + // visit the input expression. + return fi + } + // This is a call of an instantiation of a generic function, + // e.g. `foo[int, bool]` in `func foo[T1, T2 any]() { ... }; func main() { foo[int, bool]() }` + fi.callToNamedFunc(fi.instanceForIdent(f.X.(*ast.Ident)), deferredCall) + return fi + default: + if astutil.IsTypeExpr(f, fi.pkgInfo.Info) { + // This is a type conversion, not a call. Type assertion itself is not + // blocking, but we will visit the input expression. + return fi + } + // The function is returned by a non-trivial expression. We have to be + // conservative and assume that function might be blocking. + fi.markBlocking(fi.visitorStack) + if deferredCall { + fi.deferStmts = append(fi.deferStmts, newBlockingDefer()) + } + return fi + } +} + +func (fi *FuncInfo) instanceForIdent(fnId *ast.Ident) typeparams.Instance { + tArgs := fi.pkgInfo.Info.Instances[fnId].TypeArgs + return typeparams.Instance{ + Object: fi.pkgInfo.Uses[fnId], + TArgs: fi.resolver.SubstituteAll(tArgs), + } +} + +func (fi *FuncInfo) instanceForSelection(sel *types.Selection) typeparams.Instance { + if _, ok := sel.Obj().Type().(*types.Signature); ok { + // Substitute the selection to ensure that the receiver has the correct + // type arguments propagated down from the caller. + resolved := fi.resolver.SubstituteSelection(sel) + sig := resolved.Obj().Type().(*types.Signature) + + // Using the substituted receiver type, find the instance of this call. + // This does require looking up the original method in the receiver type + // that may or may not have been the receiver prior to the substitution. + if recv := sig.Recv(); recv != nil { + typ := recv.Type() + if ptrType, ok := typ.(*types.Pointer); ok { + typ = ptrType.Elem() + } + + if rt, ok := typ.(*types.Named); ok { + origMethod, _, _ := types.LookupFieldOrMethod(rt.Origin(), true, rt.Obj().Pkg(), resolved.Obj().Name()) + if origMethod == nil { + panic(fmt.Errorf(`failed to lookup field %q in type %v`, resolved.Obj().Name(), rt.Origin())) + } + return typeparams.Instance{ + Object: origMethod, + TArgs: fi.resolver.SubstituteAll(rt.TypeArgs()), + } + } + } + } + return typeparams.Instance{Object: sel.Obj()} +} + +func (fi *FuncInfo) callToNamedFunc(callee typeparams.Instance, deferredCall bool) { + switch o := callee.Object.(type) { + case *types.Func: + o = o.Origin() + if recv := o.Type().(*types.Signature).Recv(); recv != nil { + if _, ok := recv.Type().Underlying().(*types.Interface); ok { + // Conservatively assume that an interface implementation may be blocking. + fi.markBlocking(fi.visitorStack) + if deferredCall { + fi.deferStmts = append(fi.deferStmts, newBlockingDefer()) + } + return + } + } + + // We probably don't know yet whether the callee function is blocking. + // Record the calls site for the later stage. + paths := fi.instCallees.Get(callee) + paths = append(paths, fi.visitorStack.copy()) + fi.instCallees.Set(callee, paths) + if deferredCall { + fi.deferStmts = append(fi.deferStmts, newInstDefer(callee)) + } + case *types.Var: + // Conservatively assume that a function in a variable might be blocking. + fi.markBlocking(fi.visitorStack) + if deferredCall { + fi.deferStmts = append(fi.deferStmts, newBlockingDefer()) + } + default: + // No need to add defers for other call types, such as *types.Builtin, + // since those are considered non-blocking. + return + } +} + +func (fi *FuncInfo) markBlocking(stack astPath) { + for _, n := range stack { + fi.Blocking[n] = true + fi.Flattened[n] = true + } +} + +func (fi *FuncInfo) markFlattened(stack astPath) { + for _, n := range stack { + fi.Flattened[n] = true + } +} + +// skipParentNode is a visitor that skips the next node in the AST +// but will continue visiting the rest of the tree including the +// children of the skipped node. +type skipParentNode struct { + then ast.Visitor +} + +func (v skipParentNode) Visit(node ast.Node) ast.Visitor { + return v.then +} diff --git a/compiler/internal/analysis/info_test.go b/compiler/internal/analysis/info_test.go new file mode 100644 index 000000000..0df26b0b9 --- /dev/null +++ b/compiler/internal/analysis/info_test.go @@ -0,0 +1,1896 @@ +package analysis + +import ( + "fmt" + "go/ast" + "go/types" + "sort" + "testing" + + "github.com/gopherjs/gopherjs/compiler/internal/typeparams" + "github.com/gopherjs/gopherjs/internal/srctesting" +) + +func TestBlocking_Simple(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func notBlocking() { + println("hi") + }`) + bt.assertNotBlocking(`notBlocking`) +} + +func TestBlocking_Recursive(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func notBlocking(i int) { + if i > 0 { + println(i) + notBlocking(i - 1) + } + }`) + bt.assertNotBlocking(`notBlocking`) +} + +func TestBlocking_AlternatingRecursive(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func near(i int) { + if i > 0 { + println(i) + far(i) + } + } + + func far(i int) { + near(i - 1) + }`) + bt.assertNotBlocking(`near`) + bt.assertNotBlocking(`far`) +} + +func TestBlocking_Channels(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func readFromChannel(c chan bool) { + <-c + } + + func readFromChannelAssign(c chan bool) { + v := <-c + println(v) + } + + func readFromChannelAsArg(c chan bool) { + println(<-c) + } + + func sendToChannel(c chan bool) { + c <- true + } + + func rangeOnChannel(c chan bool) { + for v := range c { + println(v) + } + } + + func rangeOnSlice(c []bool) { + for v := range c { + println(v) + } + }`) + bt.assertBlocking(`readFromChannel`) + bt.assertBlocking(`sendToChannel`) + bt.assertBlocking(`rangeOnChannel`) + bt.assertBlocking(`readFromChannelAssign`) + bt.assertBlocking(`readFromChannelAsArg`) + bt.assertNotBlocking(`rangeOnSlice`) +} + +func TestBlocking_Selects(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func selectReadWithoutDefault(a, b chan bool) { + select { + case <-a: + println("a") + case v := <-b: + println("b", v) + } + } + + func selectReadWithDefault(a, b chan bool) { + select { + case <-a: + println("a") + case v := <-b: + println("b", v) + default: + println("nothing") + } + } + + func selectSendWithoutDefault(a, b chan bool) { + select { + case a <- true: + println("a") + case b <- false: + println("b") + } + } + + func selectSendWithDefault(a, b chan bool) { + select { + case a <- true: + println("a") + case b <- false: + println("b") + default: + println("nothing") + } + }`) + bt.assertBlocking(`selectReadWithoutDefault`) + bt.assertBlocking(`selectSendWithoutDefault`) + bt.assertNotBlocking(`selectReadWithDefault`) + bt.assertNotBlocking(`selectSendWithDefault`) +} + +func TestBlocking_GoRoutines_WithFuncLiterals(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func notBlocking(c chan bool) { + go func(c chan bool) { // line 4 + println(<-c) + }(c) + } + + func blocking(c chan bool) { + go func(v bool) { // line 10 + println(v) + }(<-c) + }`) + bt.assertNotBlocking(`notBlocking`) + bt.assertBlockingLit(4, ``) + + bt.assertBlocking(`blocking`) + bt.assertNotBlockingLit(10, ``) +} + +func TestBlocking_GoRoutines_WithNamedFuncs(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func blockingRoutine(c chan bool) { + println(<-c) + } + + func nonBlockingRoutine(v bool) { + println(v) + } + + func notBlocking(c chan bool) { + go blockingRoutine(c) + } + + func blocking(c chan bool) { + go nonBlockingRoutine(<-c) + }`) + bt.assertBlocking(`blockingRoutine`) + bt.assertNotBlocking(`nonBlockingRoutine`) + + bt.assertNotBlocking(`notBlocking`) + bt.assertBlocking(`blocking`) +} + +func TestBlocking_Defers_WithoutReturns_WithFuncLiterals(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func blockingBody(c chan bool) { + defer func(c chan bool) { // line 4 + println(<-c) + }(c) + } + + func blockingArg(c chan bool) { + defer func(v bool) { // line 10 + println(v) + }(<-c) + } + + func notBlocking(c chan bool) { + defer func(v bool) { // line 16 + println(v) + }(true) + }`) + bt.assertBlocking(`blockingBody`) + bt.assertBlockingLit(4, ``) + + bt.assertBlocking(`blockingArg`) + bt.assertNotBlockingLit(10, ``) + + bt.assertNotBlocking(`notBlocking`) + bt.assertNotBlockingLit(16, ``) +} + +func TestBlocking_Defers_WithoutReturns_WithNamedFuncs(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func blockingPrint(c chan bool) { + println(<-c) + } + + func nonBlockingPrint(v bool) { + println(v) + } + + func blockingBody(c chan bool) { + defer blockingPrint(c) + } + + func blockingArg(c chan bool) { + defer nonBlockingPrint(<-c) + } + + func notBlocking(c chan bool) { + defer nonBlockingPrint(true) + }`) + bt.assertFuncInstCount(5) + bt.assertFuncLitCount(0) + + bt.assertBlocking(`blockingPrint`) + bt.assertNotBlocking(`nonBlockingPrint`) + + bt.assertBlocking(`blockingBody`) + bt.assertBlocking(`blockingArg`) + bt.assertNotBlocking(`notBlocking`) +} + +func TestBlocking_Defers_WithReturns_WithFuncLiterals(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func blockingBody(c chan bool) int { + defer func(c chan bool) { // line 4 + println(<-c) + }(c) + return 42 + } + + func blockingArg(c chan bool) int { + defer func(v bool) { // line 11 + println(v) + }(<-c) + return 42 + } + + func notBlocking(c chan bool) int { + defer func(v bool) { // line 18 + println(v) + }(true) + return 42 + }`) + bt.assertBlocking(`blockingBody`) + bt.assertBlockingLit(4, ``) + + bt.assertBlocking(`blockingArg`) + bt.assertNotBlockingLit(11, ``) + + bt.assertNotBlocking(`notBlocking`) + bt.assertNotBlockingLit(18, ``) +} + +func TestBlocking_Defers_WithReturns_WithNamedFuncs(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func blockingPrint(c chan bool) { + println(<-c) + } + + func nonBlockingPrint(v bool) { + println(v) + } + + func blockingBody(c chan bool) int { + defer blockingPrint(c) + return 42 // line 13 + } + + func blockingArg(c chan bool) int { + defer nonBlockingPrint(<-c) + return 42 // line 18 + } + + func notBlocking(c chan bool) int { + defer nonBlockingPrint(true) + return 42 // line 23 + }`) + bt.assertBlocking(`blockingPrint`) + bt.assertNotBlocking(`nonBlockingPrint`) + + bt.assertBlocking(`blockingBody`) + bt.assertBlockingReturn(13, ``) + + bt.assertBlocking(`blockingArg`) + // The defer is non-blocking so the return is not blocking + // even though the function is blocking. + bt.assertNotBlockingReturn(18, ``) + + bt.assertNotBlocking(`notBlocking`) + bt.assertNotBlockingReturn(23, ``) +} + +func TestBlocking_Defers_WithMultipleReturns(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func foo(c chan int) bool { + defer func() { // line 4 + if r := recover(); r != nil { + println("Error", r) + } + }() + + if c == nil { + return false // line 11 + } + + defer func(v int) { // line 14 + println(v) + }(<-c) + + value := <-c + if value < 0 { + return false // line 20 + } + + if value > 0 { + defer func() { // line 24 + println(<-c) + }() + + return false // line 28 + } + + return true // line 31 + }`) + bt.assertBlocking(`foo`) + bt.assertNotBlockingLit(4, ``) + // Early escape from function without blocking defers is not blocking. + bt.assertNotBlockingReturn(11, ``) + bt.assertNotBlockingLit(14, ``) + // Function has had blocking by this point but no blocking defers yet. + bt.assertNotBlockingReturn(20, ``) + bt.assertBlockingLit(24, ``) + // The return is blocking because of a blocking defer. + bt.assertBlockingReturn(28, ``) + // Technically the return on line 31 is not blocking since the defer that + // is blocking can only exit through the return on line 28, but it would be + // difficult to determine which defers would only affect certain returns + // without doing full control flow analysis. + // + // TODO(grantnelson-wf): We could fix this at some point by keeping track + // of which flow control statements (e.g. if-statements) are terminating + // or not. Any defers added in a terminating control flow would not + // propagate to returns that are not in that block. + // See golang.org/x/tools/go/ssa for flow control analysis. + // + // For now we simply build up the list of defers as we go making + // the return on line 31 also blocking. + bt.assertBlockingReturn(31, ``) +} + +func TestBlocking_Defers_WithReturnsAndDefaultBlocking(t *testing.T) { + bt := newBlockingTest(t, + `package test + + type foo struct {} + func (f foo) Bar() { + println("foo") + } + + type stringer interface { + Bar() + } + + var fb = foo{}.Bar + + func deferInterfaceCall() bool { + var s stringer = foo{} + defer s.Bar() + return true // line 17 + } + + func deferVarCall() bool { + defer fb() + return true // line 22 + } + + func deferLocalVarCall() bool { + fp := foo{}.Bar + defer fp() + return true // line 28 + } + + func deferMethodExpressionCall() bool { + fp := foo.Bar + defer fp(foo{}) + return true // line 34 + } + + func deferSlicedFuncCall() bool { + s := []func() { fb, foo{}.Bar } + defer s[0]() + return true // line 40 + } + + func deferMappedFuncCall() bool { + m := map[string]func() { + "fb": fb, + "fNew": foo{}.Bar, + } + defer m["fb"]() + return true // line 49 + }`) + + bt.assertFuncInstCount(7) + bt.assertNotBlocking(`foo.Bar`) + + // None of these are actually blocking but we treat them like they are + // because the defers invoke functions via interfaces and function pointers. + bt.assertBlocking(`deferInterfaceCall`) + bt.assertBlocking(`deferVarCall`) + bt.assertBlocking(`deferLocalVarCall`) + bt.assertBlocking(`deferMethodExpressionCall`) + bt.assertBlocking(`deferSlicedFuncCall`) + bt.assertBlocking(`deferMappedFuncCall`) + + // All of these returns are blocking because they have blocking defers. + bt.assertBlockingReturn(17, ``) + bt.assertBlockingReturn(22, ``) + bt.assertBlockingReturn(28, ``) + bt.assertBlockingReturn(34, ``) + bt.assertBlockingReturn(40, ``) + bt.assertBlockingReturn(49, ``) +} + +func TestBlocking_Defers_WithReturnsAndDeferBuiltin(t *testing.T) { + bt := newBlockingTest(t, + `package test + + type strSet map[string]bool + + func deferBuiltinCall() strSet { + m := strSet{ + "foo": true, + } + defer delete(m, "foo") + return m // line 10 + }`) + + bt.assertFuncInstCount(1) + bt.assertNotBlocking(`deferBuiltinCall`) + bt.assertNotBlockingReturn(10, ``) +} + +func TestBlocking_Defers_WithReturnsInLoops(t *testing.T) { + // These are example of where a defer can affect the return that + // occurs prior to the defer in the function body. + bt := newBlockingTest(t, + `package test + + func blocking(c chan int) { + println(<-c) + } + + func deferInForLoop(c chan int) bool { + i := 1000 + for { + i-- + if i <= 0 { + return true // line 12 + } + defer blocking(c) + } + } + + func deferInForLoopReturnAfter(c chan int) bool { + for i := 1000; i > 0; i-- { + defer blocking(c) + } + return true // line 22 + } + + func deferInNamedForLoop(c chan int) bool { + i := 1000 + Start: + for { + i-- + if i <= 0 { + return true // line 31 + } + defer blocking(c) + continue Start + } + } + + func deferInNamedForLoopReturnAfter(c chan int) bool { + Start: + for i := 1000; i > 0; i-- { + defer blocking(c) + continue Start + } + return true // line 44 + } + + func deferInGotoLoop(c chan int) bool { + i := 1000 + Start: + i-- + if i <= 0 { + return true // line 52 + } + defer blocking(c) + goto Start + } + + func deferInGotoLoopReturnAfter(c chan int) bool { + i := 1000 + Start: + defer blocking(c) + i-- + if i > 0 { + goto Start + } + return true // line 66 + } + + func deferInRangeLoop(c chan int) bool { + s := []int{1, 2, 3} + for i := range s { + if i > 3 { + return true // line 73 + } + defer blocking(c) + } + return false // line 77 + }`) + + bt.assertFuncInstCount(8) + bt.assertBlocking(`blocking`) + bt.assertBlocking(`deferInForLoop`) + bt.assertBlocking(`deferInForLoopReturnAfter`) + bt.assertBlocking(`deferInNamedForLoop`) + bt.assertBlocking(`deferInNamedForLoopReturnAfter`) + bt.assertBlocking(`deferInGotoLoop`) + bt.assertBlocking(`deferInGotoLoopReturnAfter`) + bt.assertBlocking(`deferInRangeLoop`) + // When the following 2 returns are defined there are no defers, however, + // because of the loop, the blocking defers defined after the return will + // block the returns. + bt.assertBlockingReturn(12, ``) + bt.assertBlockingReturn(22, ``) + bt.assertBlockingReturn(31, ``) + bt.assertBlockingReturn(44, ``) + bt.assertBlockingReturn(52, ``) + bt.assertBlockingReturn(66, ``) + bt.assertBlockingReturn(73, ``) + bt.assertBlockingReturn(77, ``) +} + +func TestBlocking_Defers_WithReturnsInLoopsInLoops(t *testing.T) { + // These are example of where a defer can affect the return that + // occurs prior to the defer in the function body. + bt := newBlockingTest(t, + `package test + + func blocking(c chan int) { + println(<-c) + } + + func forLoopTheLoop(c chan int) bool { + if c == nil { + return false // line 9 + } + for i := 0; i < 10; i++ { + if i > 3 { + return true // line 13 + } + for j := 0; j < 10; j++ { + if j > 3 { + return true // line 17 + } + defer blocking(c) + if j > 2 { + return false // line 21 + } + } + if i > 2 { + return false // line 25 + } + } + return false // line 28 + } + + func rangeLoopTheLoop(c chan int) bool { + data := []int{1, 2, 3} + for i := range data { + for j := range data { + if i + j > 3 { + return true // line 36 + } + } + defer blocking(c) + } + return false // line 41 + } + + func noopThenLoop(c chan int) bool { + data := []int{1, 2, 3} + for i := range data { + if i > 13 { + return true // line 48 + } + defer func() { println("hi") }() + } + for i := range data { + if i > 3 { + return true // line 54 + } + defer blocking(c) + } + return false // line 58 + }`) + + bt.assertFuncInstCount(4) + bt.assertBlocking(`blocking`) + bt.assertBlocking(`forLoopTheLoop`) + bt.assertNotBlockingReturn(9, ``) + bt.assertBlockingReturn(13, ``) + bt.assertBlockingReturn(17, ``) + bt.assertBlockingReturn(21, ``) + bt.assertBlockingReturn(25, ``) + bt.assertBlockingReturn(28, ``) + bt.assertBlocking(`rangeLoopTheLoop`) + bt.assertBlockingReturn(36, ``) + bt.assertBlockingReturn(41, ``) + bt.assertBlocking(`noopThenLoop`) + bt.assertNotBlockingReturn(48, ``) + bt.assertBlockingReturn(54, ``) + bt.assertBlockingReturn(58, ``) +} + +func TestBlocking_Returns_WithoutDefers(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func blocking(c chan bool) bool { + return <-c // line 4 + } + + func blockingBeforeReturn(c chan bool) bool { + v := <-c + return v // line 9 + } + + func indirectlyBlocking(c chan bool) bool { + return blocking(c) // line 13 + } + + func indirectlyBlockingBeforeReturn(c chan bool) bool { + v := blocking(c) + return v // line 18 + } + + func notBlocking(c chan bool) bool { + return true // line 22 + }`) + bt.assertBlocking(`blocking`) + bt.assertBlockingReturn(4, ``) + + bt.assertBlocking(`blockingBeforeReturn`) + bt.assertNotBlockingReturn(9, ``) + + bt.assertBlocking(`indirectlyBlocking`) + bt.assertBlockingReturn(13, ``) + + bt.assertBlocking(`indirectlyBlockingBeforeReturn`) + bt.assertNotBlockingReturn(18, ``) + + bt.assertNotBlocking(`notBlocking`) + bt.assertNotBlockingReturn(22, ``) +} + +func TestBlocking_Defers_WithReturnsInInstances(t *testing.T) { + // This is an example of a deferred function literal inside of + // an instance of a generic function affecting the return + // differently based on the type arguments of the instance. + bt := newBlockingTest(t, + `package test + + type BazBlocker struct { + c chan bool + } + func (bb BazBlocker) Baz() { + println(<-bb.c) + } + + type BazNotBlocker struct {} + func (bnb BazNotBlocker) Baz() { + println("hi") + } + + type Foo interface { Baz() } + func FooBaz[T Foo]() bool { + defer func() { // line 17 + var foo T + foo.Baz() + }() + return true // line 21 + } + + func main() { + FooBaz[BazBlocker]() + FooBaz[BazNotBlocker]() + }`) + + bt.assertFuncInstCount(5) + bt.assertBlocking(`BazBlocker.Baz`) + bt.assertNotBlocking(`BazNotBlocker.Baz`) + bt.assertBlockingInst(`pkg/test.FooBaz`) + bt.assertNotBlockingInst(`pkg/test.FooBaz`) + bt.assertBlocking(`main`) + + bt.assertFuncLitCount(2) + bt.assertBlockingLit(17, `pkg/test.BazBlocker`) + bt.assertNotBlockingLit(17, `pkg/test.BazNotBlocker`) + + bt.assertBlockingReturn(21, `pkg/test.BazBlocker`) + bt.assertNotBlockingReturn(21, `pkg/test.BazNotBlocker`) +} + +func TestBlocking_Defers_WithReturnsAndOtherPackages(t *testing.T) { + otherSrc := `package other + + func Blocking() { + c := make(chan int) + println(<-c) + } + + func NotBlocking() { + println("Hello") + }` + + testSrc := `package test + + import "pkg/other" + + func deferOtherBlocking() bool { + defer other.Blocking() + return true // line 7 + } + + func deferOtherNotBlocking() bool { + defer other.NotBlocking() + return true // line 12 + }` + + bt := newBlockingTestWithOtherPackage(t, testSrc, otherSrc) + + bt.assertBlocking(`deferOtherBlocking`) + bt.assertBlockingReturn(7, ``) + + bt.assertNotBlocking(`deferOtherNotBlocking`) + bt.assertNotBlockingReturn(12, ``) +} + +func TestBlocking_FunctionLiteral(t *testing.T) { + // See: https://github.com/gopherjs/gopherjs/issues/955. + bt := newBlockingTest(t, + `package test + + func blocking() { + c := make(chan bool) + <-c + } + + func indirectlyBlocking() { + func() { blocking() }() // line 9 + } + + func directlyBlocking() { + func() { // line 13 + c := make(chan bool) + <-c + }() + } + + func notBlocking() { + func() { println() } () // line 20 + }`) + bt.assertBlocking(`blocking`) + + bt.assertBlocking(`indirectlyBlocking`) + bt.assertBlockingLit(9, ``) + + bt.assertBlocking(`directlyBlocking`) + bt.assertBlockingLit(13, ``) + + bt.assertNotBlocking(`notBlocking`) + bt.assertNotBlockingLit(20, ``) +} + +func TestBlocking_LinkedFunction(t *testing.T) { + bt := newBlockingTest(t, + `package test + + // linked to some other function + func blocking() + + func indirectlyBlocking() { + blocking() + }`) + bt.assertBlocking(`blocking`) + bt.assertBlocking(`indirectlyBlocking`) +} + +func TestBlocking_Instances_WithSingleTypeArg(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func blocking[T any]() { + c := make(chan T) + <-c + } + + func notBlocking[T any]() { + var v T + println(v) + } + + func bInt() { + blocking[int]() + } + + func nbUint() { + notBlocking[uint]() + }`) + bt.assertFuncInstCount(4) + // blocking and notBlocking as generics do not have FuncInfo, + // only non-generic and instances have FuncInfo. + + bt.assertBlockingInst(`pkg/test.blocking`) + bt.assertBlocking(`bInt`) + bt.assertNotBlockingInst(`pkg/test.notBlocking`) + bt.assertNotBlocking(`nbUint`) +} + +func TestBlocking_Instances_WithMultipleTypeArgs(t *testing.T) { + bt := newBlockingTest(t, + `package test + + func blocking[K comparable, V any, M ~map[K]V]() { + c := make(chan M) + <-c + } + + func notBlocking[K comparable, V any, M ~map[K]V]() { + var m M + println(m) + } + + func bInt() { + blocking[string, int, map[string]int]() + } + + func nbUint() { + notBlocking[string, uint, map[string]uint]() + }`) + bt.assertFuncInstCount(4) + // blocking and notBlocking as generics do not have FuncInfo, + // only non-generic and instances have FuncInfo. + + bt.assertBlockingInst(`pkg/test.blocking`) + bt.assertBlocking(`bInt`) + bt.assertNotBlockingInst(`pkg/test.notBlocking`) + bt.assertNotBlocking(`nbUint`) +} + +func TestBlocking_Indexed_FunctionSlice(t *testing.T) { + // This calls notBlocking but since the function pointers + // are in the slice they will both be considered as blocking. + bt := newBlockingTest(t, + `package test + + func blocking() { + c := make(chan int) + <-c + } + + func notBlocking() { + println() + } + + var funcs = []func() { blocking, notBlocking } + + func indexer(i int) { + funcs[i]() + }`) + bt.assertBlocking(`blocking`) + bt.assertBlocking(`indexer`) + bt.assertNotBlocking(`notBlocking`) +} + +func TestBlocking_Indexed_FunctionMap(t *testing.T) { + // This calls notBlocking but since the function pointers + // are in the map they will both be considered as blocking. + bt := newBlockingTest(t, + `package test + + func blocking() { + c := make(chan int) + <-c + } + + func notBlocking() { + println() + } + + var funcs = map[string]func() { + "b": blocking, + "nb": notBlocking, + } + + func indexer(key string) { + funcs[key]() + }`) + bt.assertBlocking(`blocking`) + bt.assertBlocking(`indexer`) + bt.assertNotBlocking(`notBlocking`) +} + +func TestBlocking_Indexed_FunctionArray(t *testing.T) { + // This calls notBlocking but since the function pointers + // are in the array they will both be considered as blocking. + bt := newBlockingTest(t, + `package test + + func blocking() { + c := make(chan int) + <-c + } + + func notBlocking() { + println() + } + + var funcs = [2]func() { blocking, notBlocking } + + func indexer(i int) { + funcs[i]() + }`) + bt.assertBlocking(`blocking`) + bt.assertBlocking(`indexer`) + bt.assertNotBlocking(`notBlocking`) +} + +func TestBlocking_Casting_InterfaceInstanceWithSingleTypeParam(t *testing.T) { + // This checks that casting to an instance type with a single type parameter + // is treated as a cast and not accidentally treated as a function call. + bt := newBlockingTest(t, + `package test + + type Foo[T any] interface { + Baz() T + } + + type Bar struct { + name string + } + + func (b Bar) Baz() string { + return b.name + } + + func caster() Foo[string] { + b := Bar{name: "foo"} + return Foo[string](b) + }`) + bt.assertNotBlocking(`caster`) +} + +func TestBlocking_Casting_InterfaceInstanceWithMultipleTypeParams(t *testing.T) { + // This checks that casting to an instance type with multiple type parameters + // is treated as a cast and not accidentally treated as a function call. + bt := newBlockingTest(t, + `package test + + type Foo[K comparable, V any] interface { + Baz(K) V + } + + type Bar struct { + dat map[string]int + } + + func (b Bar) Baz(key string) int { + return b.dat[key] + } + + func caster() Foo[string, int] { + b := Bar{ dat: map[string]int{ "foo": 2 }} + return Foo[string, int](b) + }`) + bt.assertNotBlocking(`caster`) +} + +func TestBlocking_Casting_Interface(t *testing.T) { + // This checks that non-generic casting of type is treated as a + // cast and not accidentally treated as a function call. + bt := newBlockingTest(t, + `package test + + type Foo interface { + Baz() string + } + + type Bar struct { + name string + } + + func (b Bar) Baz() string { + return b.name + } + + func caster() Foo { + b := Bar{"foo"} + return Foo(b) + }`) + bt.assertNotBlocking(`caster`) +} + +func TestBlocking_ComplexCasting(t *testing.T) { + // This checks a complex casting to a type is treated as a + // cast and not accidentally treated as a function call. + bt := newBlockingTest(t, + `package test + + type Foo interface { + Bar() string + } + + func doNothing(f Foo) Foo { + return interface{ Bar() string }(f) + }`) + bt.assertNotBlocking(`doNothing`) +} + +func TestBlocking_ComplexCall(t *testing.T) { + // This checks a complex call of a function is defaulted to blocking. + bt := newBlockingTest(t, + `package test + + type Foo func() string + + func bar(f any) string { + return f.(Foo)() + }`) + bt.assertBlocking(`bar`) +} + +func TestBlocking_CallWithNamedInterfaceReceiver(t *testing.T) { + // This checks that calling a named interface function is defaulted to blocking. + bt := newBlockingTest(t, + `package test + + type Foo interface { + Baz() + } + + func bar(f Foo) { + f.Baz() + }`) + bt.assertBlocking(`bar`) +} + +func TestBlocking_CallWithUnnamedInterfaceReceiver(t *testing.T) { + // This checks that calling an unnamed interface function is defaulted to blocking. + bt := newBlockingTest(t, + `package test + + func bar(f interface { Baz() }) { + f.Baz() + }`) + bt.assertBlocking(`bar`) +} + +func TestBlocking_VarFunctionCall(t *testing.T) { + // This checks that calling a function in a var is defaulted to blocking. + bt := newBlockingTest(t, + `package test + + var foo = func() { // line 3 + println("hi") + } + + func bar() { + foo() + }`) + bt.assertNotBlockingLit(3, ``) + bt.assertBlocking(`bar`) +} + +func TestBlocking_FieldFunctionCallOnNamed(t *testing.T) { + // This checks that calling a function in a field is defaulted to blocking. + // This should be the same as the previous test but with a field since + // all function pointers are treated as blocking. + bt := newBlockingTest(t, + `package test + + type foo struct { + Baz func() + } + + func bar(f foo) { + f.Baz() + }`) + bt.assertBlocking(`bar`) +} + +func TestBlocking_FieldFunctionCallOnUnnamed(t *testing.T) { + // Same as previous test but with an unnamed struct. + bt := newBlockingTest(t, + `package test + + func bar(f struct { Baz func() }) { + f.Baz() + }`) + bt.assertBlocking(`bar`) +} + +func TestBlocking_ParamFunctionCall(t *testing.T) { + // Same as previous test but with an unnamed function parameter. + bt := newBlockingTest(t, + `package test + + func bar(baz func()) { + baz() + }`) + bt.assertBlocking(`bar`) +} + +func TestBlocking_FunctionUnwrapping(t *testing.T) { + // Test that calling a function that calls a function etc. + // is defaulted to blocking. + bt := newBlockingTest(t, + `package test + + func bar(baz func()func()func()) { + baz()()() + }`) + bt.assertBlocking(`bar`) +} + +func TestBlocking_MethodCall_NonPointer(t *testing.T) { + // Test that calling a method on a non-pointer receiver. + bt := newBlockingTest(t, + `package test + + type Foo struct {} + + func (f Foo) blocking() { + ch := make(chan bool) + <-ch + } + + func (f Foo) notBlocking() { + println("hi") + } + + func blocking(f Foo) { + f.blocking() + } + + func notBlocking(f Foo) { + f.notBlocking() + }`) + bt.assertBlocking(`Foo.blocking`) + bt.assertNotBlocking(`Foo.notBlocking`) + bt.assertBlocking(`blocking`) + bt.assertNotBlocking(`notBlocking`) +} + +func TestBlocking_MethodCall_Pointer(t *testing.T) { + // Test that calling a method on a pointer receiver. + bt := newBlockingTest(t, + `package test + + type Foo struct {} + + func (f *Foo) blocking() { + ch := make(chan bool) + <-ch + } + + func (f *Foo) notBlocking() { + println("hi") + } + + func blocking(f *Foo) { + f.blocking() + } + + func notBlocking(f *Foo) { + f.notBlocking() + }`) + bt.assertBlocking(`Foo.blocking`) + bt.assertNotBlocking(`Foo.notBlocking`) + bt.assertBlocking(`blocking`) + bt.assertNotBlocking(`notBlocking`) +} + +func TestBlocking_InstantiationBlocking(t *testing.T) { + // This checks that the instantiation of a generic function is + // being used when checking for blocking not the type argument interface. + bt := newBlockingTest(t, + `package test + + type BazBlocker struct { + c chan bool + } + func (bb BazBlocker) Baz() { + println(<-bb.c) + } + + type BazNotBlocker struct {} + func (bnb BazNotBlocker) Baz() { + println("hi") + } + + type Foo interface { Baz() } + func FooBaz[T Foo](foo T) { + foo.Baz() + } + + func blockingViaExplicit() { + FooBaz[BazBlocker](BazBlocker{c: make(chan bool)}) + } + + func notBlockingViaExplicit() { + FooBaz[BazNotBlocker](BazNotBlocker{}) + } + + func blockingViaImplicit() { + FooBaz(BazBlocker{c: make(chan bool)}) + } + + func notBlockingViaImplicit() { + FooBaz(BazNotBlocker{}) + }`) + bt.assertFuncInstCount(8) + // `FooBaz` as a generic function does not have FuncInfo for it, + // only non-generic or instantiations of a generic functions have FuncInfo. + + bt.assertBlocking(`BazBlocker.Baz`) + bt.assertBlocking(`blockingViaExplicit`) + bt.assertBlocking(`blockingViaImplicit`) + bt.assertBlockingInst(`pkg/test.FooBaz`) + + bt.assertNotBlocking(`BazNotBlocker.Baz`) + bt.assertNotBlocking(`notBlockingViaExplicit`) + bt.assertNotBlocking(`notBlockingViaImplicit`) + bt.assertNotBlockingInst(`pkg/test.FooBaz`) +} + +func TestBlocking_NestedInstantiations(t *testing.T) { + // Checking that the type parameters are being propagated down into calls. + bt := newBlockingTest(t, + `package test + + func Foo[T any](t T) { + println(t) + } + + func Bar[K comparable, V any, M ~map[K]V](m M) { + Foo(m) + } + + func Baz[T any, S ~[]T](s S) { + m:= map[int]T{} + for i, v := range s { + m[i] = v + } + Bar(m) + } + + func bazInt() { + Baz([]int{1, 2, 3}) + } + + func bazString() { + Baz([]string{"one", "two", "three"}) + }`) + bt.assertFuncInstCount(8) + bt.assertNotBlocking(`bazInt`) + bt.assertNotBlocking(`bazString`) + bt.assertNotBlockingInst(`pkg/test.Foo`) + bt.assertNotBlockingInst(`pkg/test.Foo`) + bt.assertNotBlockingInst(`pkg/test.Bar`) + bt.assertNotBlockingInst(`pkg/test.Bar`) + bt.assertNotBlockingInst(`pkg/test.Baz`) + bt.assertNotBlockingInst(`pkg/test.Baz`) +} + +func TestBlocking_UnusedGenericFunctions(t *testing.T) { + // Checking that the type parameters are being propagated down into callee. + // This is based off of go1.19.13/test/typeparam/orderedmap.go + bt := newBlockingTest(t, + `package test + + type node[K, V any] struct { + key K + val V + left, right *node[K, V] + } + + type Tree[K, V any] struct { + root *node[K, V] + eq func(K, K) bool + } + + func New[K, V any](eq func(K, K) bool) *Tree[K, V] { + return &Tree[K, V]{eq: eq} + } + + func NewStrKey[K ~string, V any]() *Tree[K, V] { // unused + return New[K, V](func(k1, k2 K) bool { + return string(k1) == string(k2) + }) + } + + func NewStrStr[V any]() *Tree[string, V] { // unused + return NewStrKey[string, V]() + } + + func main() { + t := New[int, string](func(k1, k2 int) bool { + return k1 == k2 + }) + println(t) + }`) + bt.assertFuncInstCount(2) + // Notice that `NewStrKey` and `NewStrStr` are not called so doesn't have + // any known instances and therefore they don't have any FuncInfos. + bt.assertNotBlockingInst(`pkg/test.New`) + bt.assertNotBlocking(`main`) +} + +func TestBlocking_LitInstanceCalls(t *testing.T) { + // Literals defined inside a generic function must inherit the + // type arguments (resolver) of the enclosing instance it is defined in + // so that things like calls to other generic functions create the + // call to the correct concrete instance. + bt := newBlockingTest(t, + `package test + + func foo[T any](x T) { + println(x) + } + + func bar[T any](x T) { + f := func(v T) { // line 8 + foo[T](v) + } + f(x) + } + + func main() { + bar[int](42) + bar[float64](3.14) + }`) + bt.assertFuncInstCount(5) + + bt.assertNotBlockingInst(`pkg/test.foo`) + bt.assertNotBlockingInst(`pkg/test.foo`) + bt.assertNotBlockingLit(8, `int`) + bt.assertNotBlockingLit(8, `float64`) + // The following are blocking because the function literal call. + bt.assertBlockingInst(`pkg/test.bar`) + bt.assertBlockingInst(`pkg/test.bar`) +} + +func TestBlocking_BlockingLitInstance(t *testing.T) { + bt := newBlockingTest(t, + `package test + + type BazBlocker struct { + c chan bool + } + func (bb BazBlocker) Baz() { + println(<-bb.c) + } + + type BazNotBlocker struct {} + func (bnb BazNotBlocker) Baz() { + println("hi") + } + + type Foo interface { Baz() } + func FooBaz[T Foo](foo T) func() { + return func() { // line 17 + foo.Baz() + } + } + + func main() { + _ = FooBaz(BazBlocker{}) + _ = FooBaz(BazNotBlocker{}) + }`) + bt.assertFuncInstCount(5) + + bt.assertBlocking(`BazBlocker.Baz`) + // THe following is not blocking because the function literal is not called. + bt.assertNotBlockingInst(`pkg/test.FooBaz`) + bt.assertBlockingLit(17, `pkg/test.BazBlocker`) + + bt.assertNotBlocking(`BazNotBlocker.Baz`) + bt.assertNotBlockingInst(`pkg/test.FooBaz`) + bt.assertNotBlockingLit(17, `pkg/test.BazNotBlocker`) +} + +func TestBlocking_MethodSelection(t *testing.T) { + // This tests method selection using method expression (receiver as the first + // argument) selecting on type and method call selecting on a variable. + // This tests in both generic (FooBaz[T]) and non-generic contexts. + bt := newBlockingTest(t, + `package test + + type Foo interface { Baz() } + + type BazBlocker struct { + c chan bool + } + func (bb BazBlocker) Baz() { + println(<-bb.c) + } + + type BazNotBlocker struct {} + func (bnb BazNotBlocker) Baz() { + println("hi") + } + + type FooBaz[T Foo] struct {} + func (fb FooBaz[T]) ByMethodExpression() { + var foo T + T.Baz(foo) + } + func (fb FooBaz[T]) ByInstance() { + var foo T + foo.Baz() + } + + func blocking() { + fb := FooBaz[BazBlocker]{} + + FooBaz[BazBlocker].ByMethodExpression(fb) + FooBaz[BazBlocker].ByInstance(fb) + + fb.ByMethodExpression() + fb.ByInstance() + } + + func notBlocking() { + fb := FooBaz[BazNotBlocker]{} + + FooBaz[BazNotBlocker].ByMethodExpression(fb) + FooBaz[BazNotBlocker].ByInstance(fb) + + fb.ByMethodExpression() + fb.ByInstance() + }`) + bt.assertFuncInstCount(8) + + bt.assertBlocking(`BazBlocker.Baz`) + bt.assertBlockingInst(`pkg/test.FooBaz.ByMethodExpression`) + bt.assertBlockingInst(`pkg/test.FooBaz.ByInstance`) + bt.assertBlocking(`blocking`) + + bt.assertNotBlocking(`BazNotBlocker.Baz`) + bt.assertNotBlockingInst(`pkg/test.FooBaz.ByMethodExpression`) + bt.assertNotBlockingInst(`pkg/test.FooBaz.ByInstance`) + bt.assertNotBlocking(`notBlocking`) +} + +func TestBlocking_IsImportBlocking_Simple(t *testing.T) { + otherSrc := `package other + + func Blocking() { + ch := make(chan bool) + <-ch + } + + func NotBlocking() { + println("hi") + }` + + testSrc := `package test + + import "pkg/other" + + func blocking() { + other.Blocking() + } + + func notBlocking() { + other.NotBlocking() + }` + + bt := newBlockingTestWithOtherPackage(t, testSrc, otherSrc) + bt.assertBlocking(`blocking`) + bt.assertNotBlocking(`notBlocking`) +} + +func TestBlocking_IsImportBlocking_ForwardInstances(t *testing.T) { + otherSrc := `package other + + type BazBlocker struct { + c chan bool + } + func (bb BazBlocker) Baz() { + println(<-bb.c) + } + + type BazNotBlocker struct {} + func (bnb BazNotBlocker) Baz() { + println("hi") + }` + + testSrc := `package test + + import "pkg/other" + + type Foo interface { Baz() } + func FooBaz[T Foo](f T) { + f.Baz() + } + + func blocking() { + FooBaz(other.BazBlocker{}) + } + + func notBlocking() { + FooBaz(other.BazNotBlocker{}) + }` + + bt := newBlockingTestWithOtherPackage(t, testSrc, otherSrc) + bt.assertBlocking(`blocking`) + bt.assertNotBlocking(`notBlocking`) +} + +func TestBlocking_IsImportBlocking_BackwardInstances(t *testing.T) { + // This tests propagation of information across package boundaries. + // `FooBaz` has no instances in it until it is referenced in the `test` package. + // That instance information needs to propagate back across the package + // boundary to the `other` package. The information for `BazBlocker` and + // `BazNotBlocker` is propagated back to `FooBaz[BazBlocker]` and + // `FooBaz[BazNotBlocker]`. That information is then propagated forward + // to the `blocking` and `notBlocking` functions in the `test` package. + + otherSrc := `package other + + type Foo interface { Baz() } + func FooBaz[T Foo](f T) { + f.Baz() + }` + + testSrc := `package test + + import "pkg/other" + + type BazBlocker struct { + c chan bool + } + func (bb BazBlocker) Baz() { + println(<-bb.c) + } + + type BazNotBlocker struct {} + func (bnb BazNotBlocker) Baz() { + println("hi") + } + + func blocking() { + other.FooBaz(BazBlocker{}) + } + + func notBlocking() { + other.FooBaz(BazNotBlocker{}) + }` + + bt := newBlockingTestWithOtherPackage(t, testSrc, otherSrc) + bt.assertBlocking(`blocking`) + bt.assertNotBlocking(`notBlocking`) +} + +type blockingTest struct { + f *srctesting.Fixture + file *ast.File + pkgInfo *Info +} + +func newBlockingTest(t *testing.T, src string) *blockingTest { + f := srctesting.New(t) + tContext := types.NewContext() + tc := typeparams.Collector{ + TContext: tContext, + Info: f.Info, + Instances: &typeparams.PackageInstanceSets{}, + } + + file := f.Parse(`test.go`, src) + testInfo, testPkg := f.Check(`pkg/test`, file) + tc.Scan(testPkg, file) + + getImportInfo := func(path string) (*Info, error) { + return nil, fmt.Errorf(`getImportInfo should not be called in this test, called with %v`, path) + } + pkgInfo := AnalyzePkg([]*ast.File{file}, f.FileSet, testInfo, tContext, testPkg, tc.Instances, getImportInfo) + PropagateAnalysis([]*Info{pkgInfo}) + + return &blockingTest{ + f: f, + file: file, + pkgInfo: pkgInfo, + } +} + +func newBlockingTestWithOtherPackage(t *testing.T, testSrc string, otherSrc string) *blockingTest { + f := srctesting.New(t) + tContext := types.NewContext() + tc := typeparams.Collector{ + TContext: tContext, + Info: f.Info, + Instances: &typeparams.PackageInstanceSets{}, + } + + pkgInfo := map[string]*Info{} + getImportInfo := func(path string) (*Info, error) { + if info, ok := pkgInfo[path]; ok { + return info, nil + } + return nil, fmt.Errorf(`unexpected package in getImportInfo for %v`, path) + } + + otherFile := f.Parse(`other.go`, otherSrc) + _, otherPkg := f.Check(`pkg/other`, otherFile) + tc.Scan(otherPkg, otherFile) + + testFile := f.Parse(`test.go`, testSrc) + _, testPkg := f.Check(`pkg/test`, testFile) + tc.Scan(testPkg, testFile) + + otherPkgInfo := AnalyzePkg([]*ast.File{otherFile}, f.FileSet, f.Info, tContext, otherPkg, tc.Instances, getImportInfo) + pkgInfo[otherPkg.Path()] = otherPkgInfo + + testPkgInfo := AnalyzePkg([]*ast.File{testFile}, f.FileSet, f.Info, tContext, testPkg, tc.Instances, getImportInfo) + pkgInfo[testPkg.Path()] = testPkgInfo + + PropagateAnalysis([]*Info{otherPkgInfo, testPkgInfo}) + + return &blockingTest{ + f: f, + file: testFile, + pkgInfo: testPkgInfo, + } +} + +func (bt *blockingTest) assertFuncInstCount(expCount int) { + bt.f.T.Helper() + if got := bt.pkgInfo.funcInstInfos.Len(); got != expCount { + bt.f.T.Errorf(`Got %d function instance infos but expected %d.`, got, expCount) + for i, inst := range bt.pkgInfo.funcInstInfos.Keys() { + bt.f.T.Logf(` %d. %q`, i+1, inst.String()) + } + } +} + +func (bt *blockingTest) assertFuncLitCount(expCount int) { + bt.f.T.Helper() + got := 0 + for _, fis := range bt.pkgInfo.funcLitInfos { + got += len(fis) + } + if got != expCount { + bt.f.T.Errorf(`Got %d function literal infos but expected %d.`, got, expCount) + + lits := make([]string, 0, len(bt.pkgInfo.funcLitInfos)) + for fl, fis := range bt.pkgInfo.funcLitInfos { + pos := bt.f.FileSet.Position(fl.Pos()).String() + for _, fi := range fis { + lits = append(lits, pos+`<`+fi.typeArgs.String()+`>`) + } + } + sort.Strings(lits) + for i := range lits { + bt.f.T.Logf(` %d. %q`, i+1, lits[i]) + } + } +} + +func (bt *blockingTest) assertBlocking(funcName string) { + bt.f.T.Helper() + if !bt.isTypesFuncBlocking(funcName) { + bt.f.T.Errorf(`Got %q as not blocking but expected it to be blocking.`, funcName) + } +} + +func (bt *blockingTest) assertNotBlocking(funcName string) { + bt.f.T.Helper() + if bt.isTypesFuncBlocking(funcName) { + bt.f.T.Errorf(`Got %q as blocking but expected it to be not blocking.`, funcName) + } +} + +func getFuncDeclName(fd *ast.FuncDecl) string { + name := fd.Name.Name + if fd.Recv != nil && len(fd.Recv.List) == 1 && fd.Recv.List[0].Type != nil { + typ := fd.Recv.List[0].Type + if p, ok := typ.(*ast.StarExpr); ok { + typ = p.X + } + if id, ok := typ.(*ast.Ident); ok { + name = id.Name + `.` + name + } + } + return name +} + +func (bt *blockingTest) isTypesFuncBlocking(funcName string) bool { + bt.f.T.Helper() + var decl *ast.FuncDecl + ast.Inspect(bt.file, func(n ast.Node) bool { + if f, ok := n.(*ast.FuncDecl); ok && getFuncDeclName(f) == funcName { + decl = f + return false + } + return decl == nil + }) + + if decl == nil { + bt.f.T.Fatalf(`Declaration of %q is not found in the AST.`, funcName) + } + + blockingType, ok := bt.pkgInfo.Defs[decl.Name] + if !ok { + bt.f.T.Fatalf(`No function declaration found for %q.`, decl.Name) + } + + inst := typeparams.Instance{Object: blockingType.(*types.Func)} + return bt.pkgInfo.IsBlocking(inst) +} + +func (bt *blockingTest) assertBlockingLit(lineNo int, typeArgsStr string) { + bt.f.T.Helper() + if !bt.isFuncLitBlocking(lineNo, typeArgsStr) { + bt.f.T.Errorf(`Got FuncLit at line %d with type args %q as not blocking but expected it to be blocking.`, lineNo, typeArgsStr) + } +} + +func (bt *blockingTest) assertNotBlockingLit(lineNo int, typeArgsStr string) { + bt.f.T.Helper() + if bt.isFuncLitBlocking(lineNo, typeArgsStr) { + bt.f.T.Errorf(`Got FuncLit at line %d with type args %q as blocking but expected it to be not blocking.`, lineNo, typeArgsStr) + } +} + +func (bt *blockingTest) isFuncLitBlocking(lineNo int, typeArgsStr string) bool { + bt.f.T.Helper() + fnLit := srctesting.GetNodeAtLineNo[*ast.FuncLit](bt.file, bt.f.FileSet, lineNo) + if fnLit == nil { + bt.f.T.Fatalf(`FuncLit on line %d not found in the AST.`, lineNo) + } + + fis, ok := bt.pkgInfo.funcLitInfos[fnLit] + if !ok { + bt.f.T.Fatalf(`No FuncInfo found for FuncLit at line %d.`, lineNo) + } + + for _, fi := range fis { + if fi.typeArgs.String() == typeArgsStr { + return fi.IsBlocking() + } + } + + bt.f.T.Logf("FuncList instances:") + for i, fi := range fis { + bt.f.T.Logf("\t%d. %q\n", i+1, fi.typeArgs.String()) + } + bt.f.T.Fatalf(`No FuncInfo found for FuncLit at line %d with type args %q.`, lineNo, typeArgsStr) + return false +} + +func (bt *blockingTest) assertBlockingInst(instanceStr string) { + bt.f.T.Helper() + if !bt.isFuncInstBlocking(instanceStr) { + bt.f.T.Errorf(`Got function instance of %q as not blocking but expected it to be blocking.`, instanceStr) + } +} + +func (bt *blockingTest) assertNotBlockingInst(instanceStr string) { + bt.f.T.Helper() + if bt.isFuncInstBlocking(instanceStr) { + bt.f.T.Errorf(`Got function instance of %q as blocking but expected it to be not blocking.`, instanceStr) + } +} + +func (bt *blockingTest) isFuncInstBlocking(instanceStr string) bool { + bt.f.T.Helper() + instances := bt.pkgInfo.funcInstInfos.Keys() + for _, inst := range instances { + if inst.String() == instanceStr { + return bt.pkgInfo.FuncInfo(inst).IsBlocking() + } + } + bt.f.T.Logf(`Function instances found in package info:`) + for i, inst := range instances { + bt.f.T.Logf("\t%d. %s", i+1, inst.String()) + } + bt.f.T.Fatalf(`No function instance found for %q in package info.`, instanceStr) + return false +} + +func (bt *blockingTest) assertBlockingReturn(lineNo int, typeArgsStr string) { + bt.f.T.Helper() + if !bt.isReturnBlocking(lineNo, typeArgsStr) { + bt.f.T.Errorf(`Got return at line %d (%q) as not blocking but expected it to be blocking.`, lineNo, typeArgsStr) + } +} + +func (bt *blockingTest) assertNotBlockingReturn(lineNo int, typeArgsStr string) { + bt.f.T.Helper() + if bt.isReturnBlocking(lineNo, typeArgsStr) { + bt.f.T.Errorf(`Got return at line %d (%q) as blocking but expected it to be not blocking.`, lineNo, typeArgsStr) + } +} + +func (bt *blockingTest) isReturnBlocking(lineNo int, typeArgsStr string) bool { + bt.f.T.Helper() + ret := srctesting.GetNodeAtLineNo[*ast.ReturnStmt](bt.file, bt.f.FileSet, lineNo) + if ret == nil { + bt.f.T.Fatalf(`ReturnStmt on line %d not found in the AST.`, lineNo) + } + + foundInfo := []*FuncInfo{} + for _, info := range bt.pkgInfo.allInfos { + for _, rs := range info.returnStmts { + if rs.analyzeStack[len(rs.analyzeStack)-1] == ret { + if info.typeArgs.String() == typeArgsStr { + // Found info that matches the type args and + // has the return statement so return the blocking value. + return info.Blocking[ret] + } + + // Wrong instance, record for error message in the case + // that the correct one instance is not found. + foundInfo = append(foundInfo, info) + break + } + } + } + + bt.f.T.Logf("FuncInfo instances with ReturnStmt at line %d:", lineNo) + for i, info := range foundInfo { + bt.f.T.Logf("\t%d. %q\n", i+1, info.typeArgs.String()) + } + bt.f.T.Fatalf(`No FuncInfo found for ReturnStmt at line %d with type args %q.`, lineNo, typeArgsStr) + return false +} diff --git a/compiler/internal/analysis/return.go b/compiler/internal/analysis/return.go new file mode 100644 index 000000000..3c83b3c1f --- /dev/null +++ b/compiler/internal/analysis/return.go @@ -0,0 +1,21 @@ +package analysis + +// returnStmt represents a return statement that is blocking or not. +type returnStmt struct { + analyzeStack astPath + deferStmts []*deferStmt +} + +func newReturnStmt(stack astPath, deferStmts []*deferStmt) returnStmt { + return returnStmt{ + analyzeStack: stack.copy(), + deferStmts: deferStmts, + } +} + +// IsBlocking determines if the return statement is blocking or not +// based on the defer statements that affect the return. +// The return may still be blocking if the function has labels and goto's. +func (r returnStmt) IsBlocking(info *FuncInfo) bool { + return isAnyDeferBlocking(r.deferStmts, info.pkgInfo) +} diff --git a/compiler/analysis/sideeffect.go b/compiler/internal/analysis/sideeffect.go similarity index 100% rename from compiler/analysis/sideeffect.go rename to compiler/internal/analysis/sideeffect.go diff --git a/compiler/internal/dce/README.md b/compiler/internal/dce/README.md new file mode 100644 index 000000000..01ec1e8c6 --- /dev/null +++ b/compiler/internal/dce/README.md @@ -0,0 +1,625 @@ +# Dead-Code Elimination + +Dead-Code Eliminations (DCE) is used to remove code that isn't +reachable from a code entry point. Entry points are code like the main method, +init functions, and variable initializations with side effects. +These entry points are always considered alive. Any dependency of +something alive, is also considered alive. + +Once all dependencies are taken into consideration we have the set of alive +declarations. Anything not considered alive is considered dead and +may be safely eliminated, i.e. not outputted to JS. + +- [Idea](#idea) + - [Package](#package) + - [Named Types](#named-types) + - [Named Structs](#named-structs) + - [Interfaces](#interfaces) + - [Functions](#functions) + - [Variables](#variables) + - [Generics and Instances](#generics-and-instances) + - [Links](#links) +- [Design](#design) + - [Initially Alive](#initially-alive) + - [Naming](#naming) + - [Name Specifics](#name-specifics) + - [Dependencies](#dependencies) +- [Examples](#examples) + - [Dead Package](#dead-package) + - [Grandmas and Zombies](#grandmas-and-zombies) + - [Side Effects](#side-effects) + - [Instance Duck-typing](#instance-duck-typing) +- [Additional Notes](#additional-notes) + +## Idea + +The following is the logic behind the DCE mechanism. Not all of the following +is used since some conditions are difficult to determine even with a lot of +additional information, and because GopherJS stores some additional information +making some parts of DCE unnecessary. To ensure that the JS output is fully +functional, we bias the DCE towards things being alive. We'd rather keep +something we don't need than remove something that is needed. + +### Package + +Package declarations (e.g. `package foo`) might be able to be removed +when only used by dead-code. However, packages may be imported and not used +for various reasons including to invoke some initialization or to implement +a link. So it is difficult to determine. +See [Dead Package](#dead-package) example. + +Currently, we won't remove any packages, but someday the complexity +could be added to check for inits, side effects, links, etc then determine +if any of those are are alive or affect alive things. + +### Named Types + +Named type definitions (e.g. `type Foo int`) depend on +the underlying type for each definition. + +When a named type is alive, all of its exported methods +(e.g. `func (f Foo) Bar() { }`) are also alive, even any unused exported method. +Unused exported methods are still important when duck-typing. +See [Interfaces](#interfaces) for more information. +See [Grandmas and Zombies](#grandmas-and-zombies) for an example of what +can happen when removing an unused exported method. + +Also unused exported methods could be accessed by name via reflect +(e.g. `reflect.ValueOf(&Foo{}).MethodByName("Bar")`). Since the +string name may be provided from outside the code, such as the command line, +it is impossible to determine which exported methods could be accessed this way. +It would be very difficult to determine which types are ever accessed via +reflect so by default we simply assume any can be. + +Methods that are unexported may be considered dead when unused even when +the receiver type is alive. The exception is when an interface in the same +package has the same unexported method in it. +See [Interfaces](#interfaces) for more information. + +#### Named Structs + +A named struct is a named type that has a struct as its underlying type, +e.g. `type Foo struct { }`. A struct type depends on all of the types in +its fields and embedded fields. + +If the struct type is alive then all the types of the fields will also be alive. +Even unexported fields maybe accessed via reflections, so they all must be +alive. Also, the fields are needed for comparisons and serializations +(such as `encoding/binary`). + +### Interfaces + +All the types in the function signatures and embedded interfaces are the +dependents of the interface. + +Interfaces may contain exported and unexported function signatures. +If an interface is alive then all of the functions are alive. +Since there are many ways to wrap a type with an interface, any alive type that +duck-types to an interface must have all of the matching methods also alive. + +In theory the unexported functions are also alive however, for GopherJS there +is an exception because duck-typing is handled separately from the method +definitions. Those difference are discussed in [Dependencies](#dependencies) +but for this idea we discuss DCE more generally. + +Since the exported methods in an alive type will be alive, see +[Named Types](#named-types), the only ones here that need to be considered +are the unexported methods. An interface with unexported methods may only +duck-type to types within the package the interface is defined in. +Therefore, if an interface is alive with unexported methods, then all +alive types within the same package that duck-type to that interface, +will have the matching unexported methods be alive. + +Since doing a full `types.Implements` check between every named types and +interfaces in a package is difficult, we simplify this requirement to be +any unexported method in an alive named type that matches an unexported +method in an alive interface is alive even if the named type doesn't duck-type +to the interface. This means that in some rare cases, some unexported +methods on named structs that could have been eliminated will not be. +For example, given `type Foo struct{}; func(f Foo) X(); func (f Foo) y()` the +`Foo.y()` method may be alive if `types Bar interface { Z(); y() }` is alive +even though the `X()` and `Z()` means that `Foo` doesn't implement `Bar` +and therefore `Foo.y()` can not be called via a `Bar.y()`. + +We will try to reduce the false positives in alive unexported methods by using +the parameter and result types of the methods. Meaning that +`y()`, `y(int)`, `y() int`, etc won't match just because they are named `y`. +This also helps with a generic type's unexported methods that use +type parameters, e.g. `Foo.y(T)`. Since the generic type may be instantiated +with `int` and `string`, the different instances of the method are `Foo.y(int)` +and `Foo.y(string)`. By using the parameter and result types, it is possible +to remove the unused unexported method instantiations even when some +instantiations of the same method are used. + +### Functions + +Functions with or without a receiver are dependent on the types used by the +parameters, results, and type uses inside the body of the function. +They are also dependent on any function invoked or used, and +any package level variable that is used. + +Unused functions without a receiver, that are exported or not, may be +considered dead since they aren't used in duck-typing and cannot be accessed +by name via reflections. + +### Variables + +Variables (or constants) depend on their type and anything used during +initialization. + +The exported or unexported variables are dead unless they are used by something +else that is alive or if the initialization has side effects. + +If the initialization has side effects the variable will be alive even +if unused. The side effect may be simply setting another variable's value +that is also unused, however it would be difficult to determine if the +side effects are used or not. +See [Side Effects](#side-effects) example. + +### Generics and Instances + +For functions and types with generics, the definitions are split into +unique instances. For example, `type StringKeys[T any] map[string]T` +could be used in code as `StringKeys[int]` and `StringKeys[*Cat]`. +We don't need all possible instances, only the ones which are realized +in code. Each instance depends on the realized parameter types (type arguments). +In the example the type arguments are `int` and `*Cat`. + +The instance of the generic type also defines the code with the specific +type arguments (e.g. `map[string]int` and `map[string]*Cat`). When an +instance is depended on by alive code, only that instance is alive, not the +entire generic type. This means if `StringKey[*Cat]` is only used from dead +code then it is also dead and can be safely eliminated. + +The named generic types may have methods that are also copied for an instance +with the parameter types replaced by the type arguments. For example, +`func (sk StringKeys[T]) values() []T { ... }` becomes +`func (sk StringKeys[int]) values() []int { ... }` when the type argument +is `int`. This method in the instance now duck-types to +`interface { values() []int }` and therefore must follow the rules for +unexported methods. +See [Instance Duck-typing](#instance-duck-typing) example for more information. + +Functions and named types may be generic, but methods and unnamed types +may not be. This makes somethings simpler. A method with a receiver is used, +only the receiver's type arguments are needed. The generic type or function +may not be needed since only the instances are written out. + +This also means that inside of a generic function or named type there is only +one type parameter list being used. Even generic types used inside of the +generic function must be specified in terms of the type parameter for the +generic and doesn't contribute any type parameters of it's own. +For example, inside of `func Foo[K comparable, V any]() { ... }` every +usage of a generic type must specify a concrete type (`int`, `*Cat`, +`Bar[Bar[bool]]`) or use the parameter types `K` and `V`. This is simpler +than languages that allow a method of an object to have it's own type +parameters, e.g. `class X { void Y() { ... } ... }`. + +However, generics mean that the same method, receiver, type, etc names +will be used with different parameters types caused by different type +arguments. The type arguments are being passed into those parameter types +for a specific instance. +When an interface is alive, the signatures for unexported methods +need to be instantiated with type arguments so that we know which instances +the interface is duck-typing to. See [Interfaces](#interfaces) for more detail. + +### Links + +Links use compiler directives +([`//go:linkname`](https://pkg.go.dev/cmd/compile#hdr-Compiler_Directives)) +to alias a `var` or `func` with another. +For example some code may have `func bar_foo()` as a function stub that is +linked with `foo() { ... }` as a function with a body, i.e. the target of the +link. The links are single directional but allow multiple stubs to link to the +same target. + +When a link is made, the dependencies for the linked code come from +the target. If the target is used by something alive then it is alive. +If a stub linked to a target is used by something alive then that stub and +the target are both alive. + +Since links cross package boundaries in ways that may violate encapsulation +and the dependency tree, it may be difficult to determine if a link is alive +or not. Therefore, currently all links are considered alive. + +## Design + +The design is created taking all the parts of the above idea together and +simplifying the justifications down to a simple set of rules. + +### Initially alive + +- The `main` method in the `main` package +- The `init` in every included file +- Any variable initialization that has a side effect +- Any linked function or variable +- Anything not given a DCE named, e.g. packages + +### Naming + +The following specifies what declarations should be named and how +the names should look. These names are later used to match (via string +comparisons) dependencies with declarations that should be set as alive. +Since the names are used to filter out alive code from all the code +these names may also be referred to as filters. + +Some names will have multiple name parts; an object name and method name. +This is kind of like a first name and last name when a first name alone isn't +specific enough. This helps with matching multiple dependency requirements +for a declaration, i.e. both name parts must be alive before the declaration +is considered alive. + +Currently, only unexported method declarations will have a method +name to support duck-typing with unexported signatures on interfaces. +If the unexported method is depended on, then both names will be in +the dependencies. If the receiver is alive and an alive interface has the +matching unexported signature, then both names will be depended on thus making +the unexported method alive. Since the unexported method is only visible in +the package in which it is defined, the package path is included in the +method name. + +To simplify the above for GopherJS, we don't look at the receiver for +an unexported method before indicating it is alive. Meaning if there is no +interface, only two named objects with identical unexported methods, the use +of either will indicate a use of both. This will cause slightly more unexported +methods to be alive while reducing the complication of type checking which object +or type of object is performing the call. + +| Declaration | exported | unexported | non-generic | generic | object name | method name | +|:------------|:--------:|:----------:|:-----------:|:-------:|:------------|:------------| +| variables | █ | █ | █ | n/a | `.` | | +| functions | █ | █ | █ | | `.` | | +| functions | █ | █ | | █ | `.[]` | | +| named type | █ | █ | █ | | `.` | | +| named type | █ | █ | | █ | `.[]` | | +| method | █ | | █ | | `.` | | +| method | █ | | | █ | `.[]` | | +| method | | █ | █ | | `.` | `.()()` | +| method | | █ | | █ | `.[]` | `.()()` | + +#### Name Specifics + +The following are specifics about the different types of names that show +up in the above table. This isn't the only way to represent this information. +These names can get long but don't have to. The goal is to make the names +as unique as possible whilst still ensuring that signatures in +interfaces will still match the correct methods. The less unique +the more false positives for alive will occur meaning more dead code is +kept alive. However, too unique could cause needed alive code to not match +and be eliminated causing the application to not run. + +`.`, `.`, `.` +and `.` all have the same form. They are +the package path followed by a `.`, if there is a package path, +and the object name or receiver name. +For example [`rand.Shuffle`](https://pkg.go.dev/math/rand@go1.23.1#Shuffle) +will be named `math/rand.Shuffle`. The builtin [`error`](https://pkg.go.dev/builtin@go1.23.1#error) +will be named `error` without a package path. + +`.[]`, `.[]`, +and `.[]` are the same as above +except with comma separated type parameters or type arguments in square brackets. +The type parameter names are not used, instead the constraint types are since +the names for type parameters may not match even if the constraints match. +For example `type Foo[T any] struct{}; type Bar[B any] { f Foo[B] }` +has `Foo[B]` used in `Bar` that is identical to `Foo[T]` even though +technically `Foo[B]` is an instance of `Foo[T]` with the `B` type parameter +as the type argument. + +Command compiles, i.e. compiles with a `main` entry point, and test builds +should not have any type parameters that aren't resolved to concrete types, +however to handle partial compiles of packages, there may still +be a type parameter, including unions of approximate constraints, +i.e. `~int|~string`. + +Therefore, type arguments need to be reduced to only types. This means +something like [`maps.Keys`](https://pkg.go.dev/maps@go1.23.1#Keys), i.e. +`func Keys[Map ~map[K]V, K comparable, V any](m Map) iter.Seq[K]`, +will be named `maps.Keys[~map[comparable]any, comparable, any]` as a generic. +If the instances for `Map` are `map[string]int` and `map[int][]*cats.Cat`, +then respectively the names would be `maps.Keys[map[string]int, string, int]` +and `maps.Keys[map[int][]*cats.Cat, int, []*cats.Cat]`. If this function is used +in `func Foo[T ~string|~int](data map[string]T) { ... maps.Keys(data) ... }` +then the instance of `maps.Keys` that `Foo` depends on would be named +`maps.Keys[map[string]~int|~string, string, ~int|~string]`. + +For the method name of unexposed methods, +`.()()`, the prefix, +`.`, is in the same format as `.`. +The rest contains the signature, `()()`. +The signature is defined with only the types since +`(v, u int)(ok bool, err error)` should match `(x, y int)(bool, error)`. +To match both, both will have to be `(int, int)(bool, error)`. +Also the parameter types should include the veridic indicator, +e.g. `sum(...int) int`, since that affects how the signature is matched. +If there are no results then the results part is left off. Otherwise, +the result types only need parenthesis if there are more than one result, +e.g. `(int, int)`, `(int, int) bool`, and `(int, int)(bool, error)`. + +In either the object name or method name, if there is a recursive +type parameter, e.g. `func Foo[T Bar[T]]()` the second usage of the +type parameter will have it's type parameters as `...` to prevent an +infinite loop whilst also indicating which object in the type parameter +is recursive, e.g. `Foo[Bar[Bar[...]]]`. + +### Dependencies + +The dependencies are specified in an expression. +For example a function that invokes another function will be dependent on +that invoked function. When a dependency is added it will be added as one +or more names to the declaration that depends on it. It follows the +[naming rules](#naming) so that the dependencies will match correctly. + +In theory, structural dependencies would be needed to be added +automatically while the declaration is being named. When an interface is named, +it would automatically add all unexported signatures as dependencies via +`.()()`. +However, we do not need to do that in GopherJS because we aren't using +the existence of realized methods in duck-typing. GopherJS stores full set +of method information when describing the type so that, even when things like +unexported methods in interfaces are removed, duck-typing will still work +correctly. This reduces the size of the code by not keeping a potentially +long method body when the signature is all that is needed. + +Currently we don't filter unused packages so there is no need to automatically +add dependencies on the packages themselves. This is also why the package +declarations aren't named and therefore are always alive. + +## Examples + +### Dead Package + +In this example, a point package defines a `Point` object. +The point package may be used by several repos as shared code so can not +have code manually removed from it to reduce its dependencies for specific +applications. + +For the current example, the `Distance` method is never used and therefore +dead. The `Distance` method is the only method dependent on the math package. +It might be safe to make the whole math package dead too and eliminate it in +this case, however, it is possible that some packages aren't used on purpose +and their reason for being included is to invoke the initialization functions +within the package. If a package has any inits or any variable definitions +with side effects, then the package can not be safely removed. + +```go +package point + +import "math" + +type Point struct { + X float64 + Y float64 +} + +func (p Point) Sub(other Point) Point { + p.X -= other.X + p.Y -= other.Y + return p +} + +func (p Point) ToQuadrant1() Point { + if p.X < 0.0 { + p.X = -p.X + } + if p.Y < 0.0 { + p.Y = -p.Y + } + return p +} + +func (p Point) Manhattan(other Point) float64 { + a := p.Sub(other).ToQuadrant1() + return a.X + a.Y +} + +func (p Point) Distance(other Point) float64 { + d := p.Sub(other) + return math.Sqrt(d.X*d.X + d.Y*d.Y) +} +``` + +```go +package main + +import "point" + +func main() { + a := point.Point{X: 10.2, Y: 45.3} + b := point.Point{X: -23.0, Y: 7.7} + println(`Manhattan a to b:`, a.Manhattan(b)) +} +``` + +### Grandmas and Zombies + +In this example, the following code sorts grandmas and zombies by if they are +`Dangerous`. The method `EatBrains` is never used. If we remove `EatBrains` +from `Zombie` then both the grandmas and zombies are moved to the safe +bunker. If we remove `EatBrains` from `Dangerous` then both grandmas and +zombies will be moved to the air lock because `Dangerous` will duck-type +to all `Person` instances. Unused exported methods and signatures must be +considered alive if the type is alive. + +```go +package main + +import "fmt" + +type Person interface { + MoveTo(loc string) +} + +type Dangerous interface { + Person + EatBrains() +} + +type Grandma struct{} + +func (g Grandma) MoveTo(loc string) { + fmt.Println(`grandma was moved to`, loc) +} + +type Zombie struct{} + +func (z Zombie) MoveTo(loc string) { + fmt.Println(`zombie was moved to`, loc) +} + +func (z Zombie) EatBrains() {} + +func main() { + people := []Person{Grandma{}, Zombie{}, Grandma{}, Zombie{}} + for _, person := range people { + if _, ok := person.(Dangerous); ok { + person.MoveTo(`air lock`) + } else { + person.MoveTo(`safe bunker`) + } + } +} +``` + +### Side Effects + +In this example unused variables are being initialized with expressions +that has side effects. The `max` value is 8 by the time `main` is called +because each initialization calls `count()` that increments `max`. +The expression doesn't have to have a function call and can be any combination +of operations. + +An initialization may have a side effect even if it doesn't set a value. For +example, simply printing a message to the console is a side effect that +can not be removed even if it is part of an unused initializer. + +```go +package main + +import "fmt" + +func count() int { + max++ + return max +} + +var ( + max = 0 + _ = count() // a + b, c = count(), count() + x = []int{count(), count(), count()}[0] + y, z = func() (int, int) { return count(), count() }() +) + +func main() { + fmt.Println(`max count`, max) // Outputs: max count 8 +} +``` + +### Instance Duck-typing + +In this example the type `StringKeys[T any]` is a map that stores +any kind of value with string keys. There is an interface `IntProvider` +that `StringKeys` will duck-type to iff the type argument is `int`, +i.e. `StringKeys[int]`. This exemplifies how the type arguments used +in the type arguments affect the overall signature such that in some +cases a generic object may match an interface and in others it may not. + +Also notice that the structure was typed with `T` as the parameter type's +name whereas the methods use `S`. This shows that the name of the type +doesn't matter in the instancing. Therefore, outputting a methods name +(assuming it is unexported) should use the type argument type, +not the type parameter name, e.g. `value() []int` or `value() []any` +instead of `value() []S` or `value() []T`. + +```go +package main + +import ( + "fmt" + "sort" +) + +type StringKeys[T any] map[string]T + +func (sk StringKeys[S]) Keys() []string { + keys := make([]string, 0, len(sk)) + for key := range sk { + keys = append(keys, key) + } + sort.Strings(keys) + return keys +} + +func (sk StringKeys[S]) Values() []S { + values := make([]S, len(sk)) + for i, key := range sk.Keys() { + values[i] = sk[key] + } + return values +} + +type IntProvider interface { + Values() []int +} + +func Sum(data IntProvider) int { + sum := 0 + for _, value := range data.Values() { + sum += value + } + return sum +} + +func main() { + sInt := StringKeys[int]{ + `one`: 1, + `two`: 2, + `three`: 3, + `four`: 4, + } + fmt.Println(sInt.Keys()) // Outputs: [four one three two] + fmt.Println(sInt.Values()) // Outputs: [4 1 3 2] + fmt.Println(Sum(sInt)) // Outputs: 10 + + sFp := StringKeys[float64]{ + `one`: 1.1, + `two`: 2.2, + `three`: 3.3, + `four`: 4.4, + } + fmt.Println(sFp.Keys()) // Outputs: [four one three two] + fmt.Println(sFp.Values()) // [4.4 1.1 3.3 2.2] + //fmt.Println(Sum(sFp)) // Fails with "StringKeys[float64] does not implement IntProvider" +} +``` + +## Additional Notes + +This DCE is different from those found in +Muchnick, Steven S.. “Advanced Compiler Design and Implementation.” (1997), +Chapter 18 Control-Flow and Low-Level Optimization, +Section 10 Dead-Code Elimination. And different from related DCE designs +such as Knoop, Rüthing, and Steffen. "Partial dead code elimination." (1994), +SIGPLAN Not. 29, 6, 147–158. +See [DCE wiki](https://en.wikipedia.org/wiki/Dead-code_elimination) +for more information. + +Those discuss DCE at the block code level where the higher level +constructs such as functions and objects have been reduced to a graphs of +blocks with variables, procedures, and routines. Since we want to keep the +higher level constructs during transpilation, we simply are reducing +the higher level constructs not being used. + +Any variable internal to the body of a function or method that is unused or +only used for computing new values for itself, are left as is. +The Go compiler and linters have requirements that attempt to prevent this +kind of dead-code in a function body (unless an underscore is used to quite +usage warnings, e.g. `_ = unusedVar`) and prevent unreachable code. +Therefore, we aren't going to worry about trying to DCE inside of function +bodies or in variable initializers. + +GopherJS does not implicitly perform JS Tree Shaking Algorithms, as discussed in +[How Modern Javascript eliminate dead code](https://blog.stackademic.com/how-modern-javascript-eliminates-dead-code-tree-shaking-algorithm-d7861e48df40) +(2023) at this time and provides no guarantees about the effectiveness +of running such an algorithm on the resulting JS. diff --git a/compiler/internal/dce/collector.go b/compiler/internal/dce/collector.go new file mode 100644 index 000000000..fea52468d --- /dev/null +++ b/compiler/internal/dce/collector.go @@ -0,0 +1,46 @@ +package dce + +import ( + "errors" + "go/types" +) + +// Decl is any code declaration that has dead-code elimination (DCE) +// information attached to it. +type Decl interface { + Dce() *Info +} + +// Collector is a tool to collect dependencies for a declaration +// that'll be used in dead-code elimination (DCE). +type Collector struct { + dce *Info +} + +// CollectDCEDeps captures a list of Go objects (types, functions, etc.) +// the code translated inside f() depends on. Then sets those objects +// as dependencies of the given dead-code elimination info. +// +// Only one CollectDCEDeps call can be active at a time. +func (c *Collector) CollectDCEDeps(decl Decl, f func()) { + if c.dce != nil { + panic(errors.New(`called CollectDCEDeps inside another CollectDCEDeps call`)) + } + + c.dce = decl.Dce() + defer func() { c.dce = nil }() + + f() +} + +// DeclareDCEDep records that the code that is currently being transpiled +// depends on a given Go object with optional type arguments. +// +// The given optional type arguments are used to when the object is a +// function with type parameters or anytime the object doesn't carry them. +// If not given, this attempts to get the type arguments from the object. +func (c *Collector) DeclareDCEDep(o types.Object, tArgs ...types.Type) { + if c.dce != nil { + c.dce.addDep(o, tArgs) + } +} diff --git a/compiler/internal/dce/dce_test.go b/compiler/internal/dce/dce_test.go new file mode 100644 index 000000000..3ddeac848 --- /dev/null +++ b/compiler/internal/dce/dce_test.go @@ -0,0 +1,1225 @@ +package dce + +import ( + "fmt" + "go/ast" + "go/importer" + "go/parser" + "go/token" + "go/types" + "regexp" + "sort" + "testing" + + "github.com/gopherjs/gopherjs/compiler/typesutil" +) + +func Test_Collector_CalledOnce(t *testing.T) { + var c Collector + decl1 := &testDecl{} + decl2 := &testDecl{} + + err := capturePanic(t, func() { + c.CollectDCEDeps(decl1, func() { + c.CollectDCEDeps(decl2, func() { + t.Fatal(`the nested collect function was called`) + }) + }) + }) + errorMatches(t, err, `^called CollectDCEDeps inside another`) +} + +func Test_Collector_Collecting(t *testing.T) { + pkg := testPackage(`tristan`) + obj1 := quickVar(pkg, `Primus`) + obj2 := quickVar(pkg, `Secundus`) + obj3 := quickVar(pkg, `Tertius`) + obj4 := quickVar(pkg, `Quartus`) + obj5 := quickVar(pkg, `Quintus`) + obj6 := quickVar(pkg, `Sextus`) + obj7 := quickVar(pkg, `Una`) + + decl1 := quickTestDecl(obj1) + decl2 := quickTestDecl(obj2) + var c Collector + + c.DeclareDCEDep(obj1) // no effect since a collection isn't running. + depCount(t, decl1, 0) + depCount(t, decl2, 0) + + c.CollectDCEDeps(decl1, func() { + c.DeclareDCEDep(obj2) + c.DeclareDCEDep(obj3) + c.DeclareDCEDep(obj3) // already added so has no effect. + }) + depCount(t, decl1, 2) + depCount(t, decl2, 0) + + c.DeclareDCEDep(obj4) // no effect since a collection isn't running. + depCount(t, decl1, 2) + depCount(t, decl2, 0) + + c.CollectDCEDeps(decl2, func() { + c.DeclareDCEDep(obj5) + c.DeclareDCEDep(obj6) + c.DeclareDCEDep(obj7) + }) + depCount(t, decl1, 2) + depCount(t, decl2, 3) + + // The second collection adds to existing dependencies. + c.CollectDCEDeps(decl2, func() { + c.DeclareDCEDep(obj4) + c.DeclareDCEDep(obj5) + }) + depCount(t, decl1, 2) + depCount(t, decl2, 4) +} + +func Test_Info_SetNameAndDep(t *testing.T) { + tests := []struct { + name string + obj types.Object + want Info // expected Info after SetName + }{ + { + name: `package`, + obj: parseObject(t, `Sarah`, + `package jim + import Sarah "fmt"`), + want: Info{ + objectFilter: `jim.Sarah`, + }, + }, + { + name: `exported var`, + obj: parseObject(t, `Toby`, + `package jim + var Toby float64`), + want: Info{ + objectFilter: `jim.Toby`, + }, + }, + { + name: `exported const`, + obj: parseObject(t, `Ludo`, + `package jim + const Ludo int = 42`), + want: Info{ + objectFilter: `jim.Ludo`, + }, + }, + { + name: `label`, + obj: parseObject(t, `Gobo`, + `package jim + func main() { + i := 0 + Gobo: + i++ + if i < 10 { + goto Gobo + } + }`), + want: Info{ + objectFilter: `jim.Gobo`, + }, + }, + { + name: `exported specific type`, + obj: parseObject(t, `Jen`, + `package jim + type Jen struct{}`), + want: Info{ + objectFilter: `jim.Jen`, + }, + }, + { + name: `exported generic type`, + obj: parseObject(t, `Henson`, + `package jim + type Henson[T comparable] struct{}`), + want: Info{ + objectFilter: `jim.Henson[comparable]`, + }, + }, + { + name: `exported specific function`, + obj: parseObject(t, `Jareth`, + `package jim + func Jareth() {}`), + want: Info{ + objectFilter: `jim.Jareth`, + }, + }, + { + name: `exported generic function`, + obj: parseObject(t, `Didymus`, + `package jim + func Didymus[T comparable]() {}`), + want: Info{ + objectFilter: `jim.Didymus[comparable]`, + }, + }, + { + name: `exported specific method`, + obj: parseObject(t, `Kira`, + `package jim + type Fizzgig string + func (f Fizzgig) Kira() {}`), + want: Info{ + objectFilter: `jim.Fizzgig`, + }, + }, + { + name: `unexported specific method without parameters or results`, + obj: parseObject(t, `frank`, + `package jim + type Aughra int + func (a Aughra) frank() {}`), + want: Info{ + objectFilter: `jim.Aughra`, + methodFilter: `jim.frank()`, + }, + }, + { + name: `unexported specific method with parameters and results`, + obj: parseObject(t, `frank`, + `package jim + type Aughra int + func (a Aughra) frank(other Aughra) (bool, error) { + return a == other, nil + }`), + want: Info{ + objectFilter: `jim.Aughra`, + methodFilter: `jim.frank(jim.Aughra)(bool, error)`, + }, + }, + { + name: `unexported specific method with variadic parameter`, + obj: parseObject(t, `frank`, + `package jim + type Aughra int + func (a Aughra) frank(others ...Aughra) int { + return len(others) + 1 + }`), + want: Info{ + objectFilter: `jim.Aughra`, + methodFilter: `jim.frank(...jim.Aughra) int`, + }, + }, + { + name: `unexported generic method with type parameters and instance argument`, + obj: parseObject(t, `frank`, + `package jim + type Aughra[T ~float64] struct { + value T + } + func (a *Aughra[T]) frank(other *Aughra[float64]) bool { + return float64(a.value) == other.value + }`), + want: Info{ + objectFilter: `jim.Aughra[~float64]`, + methodFilter: `jim.frank(*jim.Aughra[float64]) bool`, + }, + }, + { + name: `unexported generic method with type parameters and generic argument`, + obj: parseObject(t, `frank`, + `package jim + type Aughra[T ~float64] struct { + value T + } + func (a *Aughra[T]) frank(other *Aughra[T]) bool { + return a.value == other.value + }`), + want: Info{ + objectFilter: `jim.Aughra[~float64]`, + methodFilter: `jim.frank(*jim.Aughra[~float64]) bool`, + }, + }, + { + name: `specific method on unexported type`, + obj: parseObject(t, `Red`, + `package jim + type wembley struct{} + func (w wembley) Red() {}`), + want: Info{ + objectFilter: `jim.wembley`, + }, + }, + { + name: `unexported method resulting in an interface with exported methods`, + obj: parseObject(t, `bear`, + `package jim + type Fozzie struct{} + func (f *Fozzie) bear() interface{ + WakkaWakka(joke string)(landed bool) + Firth()(string, error) + }`), + want: Info{ + objectFilter: `jim.Fozzie`, + methodFilter: `jim.bear() interface{ Firth()(string, error); WakkaWakka(string) bool }`, + }, + }, + { + name: `unexported method resulting in an interface with unexported methods`, + obj: parseObject(t, `bear`, + `package jim + type Fozzie struct{} + func (f *Fozzie) bear() interface{ + wakkaWakka(joke string)(landed bool) + firth()(string, error) + }`), + want: Info{ + objectFilter: `jim.Fozzie`, + // The package path, i.e. `jim.`, is used on unexported methods + // to ensure the filter will not match another package's method. + methodFilter: `jim.bear() interface{ jim.firth()(string, error); jim.wakkaWakka(string) bool }`, + }, + }, + { + name: `unexported method resulting in an empty interface `, + obj: parseObject(t, `bear`, + `package jim + type Fozzie struct{} + func (f *Fozzie) bear() interface{}`), + want: Info{ + objectFilter: `jim.Fozzie`, + methodFilter: `jim.bear() any`, + }, + }, + { + name: `unexported method resulting in a function`, + obj: parseObject(t, `bear`, + `package jim + type Fozzie struct{} + func (f *Fozzie) bear() func(joke string)(landed bool)`), + want: Info{ + objectFilter: `jim.Fozzie`, + methodFilter: `jim.bear() func(string) bool`, + }, + }, + { + name: `unexported method resulting in a struct`, + obj: parseObject(t, `bear`, + `package jim + type Fozzie struct{} + func (f *Fozzie) bear() struct{ + Joke string + WakkaWakka bool + }`), + want: Info{ + objectFilter: `jim.Fozzie`, + methodFilter: `jim.bear() struct{ Joke string; WakkaWakka bool }`, + }, + }, + { + name: `unexported method resulting in a struct with type parameter`, + obj: parseObject(t, `bear`, + `package jim + type Fozzie[T ~string|~int] struct{} + func (f *Fozzie[T]) bear() struct{ + Joke T + wakkaWakka bool + }`), + want: Info{ + objectFilter: `jim.Fozzie[~int|~string]`, + // The `Joke ~int|~string` part will likely not match other methods + // such as methods with `Joke string` or `Joke int`, however the + // interface should be defined for the instantiations of this type + // and those should have the correct field type for `Joke`. + methodFilter: `jim.bear() struct{ Joke ~int|~string; jim.wakkaWakka bool }`, + }, + }, + { + name: `unexported method resulting in an empty struct`, + obj: parseObject(t, `bear`, + `package jim + type Fozzie struct{} + func (f *Fozzie) bear() struct{}`), + want: Info{ + objectFilter: `jim.Fozzie`, + methodFilter: `jim.bear() struct{}`, + }, + }, + { + name: `unexported method resulting in a slice`, + obj: parseObject(t, `bear`, + `package jim + type Fozzie struct{} + func (f *Fozzie) bear()(jokes []string)`), + want: Info{ + objectFilter: `jim.Fozzie`, + methodFilter: `jim.bear() []string`, + }, + }, + { + name: `unexported method resulting in an array`, + obj: parseObject(t, `bear`, + `package jim + type Fozzie struct{} + func (f *Fozzie) bear()(jokes [2]string)`), + want: Info{ + objectFilter: `jim.Fozzie`, + methodFilter: `jim.bear() [2]string`, + }, + }, + { + name: `unexported method resulting in a map`, + obj: parseObject(t, `bear`, + `package jim + type Fozzie struct{} + func (f *Fozzie) bear()(jokes map[string]bool)`), + want: Info{ + objectFilter: `jim.Fozzie`, + methodFilter: `jim.bear() map[string]bool`, + }, + }, + { + name: `unexported method resulting in a channel`, + obj: parseObject(t, `bear`, + `package jim + type Fozzie struct{} + func (f *Fozzie) bear() chan string`), + want: Info{ + objectFilter: `jim.Fozzie`, + methodFilter: `jim.bear() chan string`, + }, + }, + { + name: `unexported method resulting in a complex compound named type`, + obj: parseObject(t, `packRat`, + `package jim + type Gonzo[T any] struct{ + v T + } + func (g Gonzo[T]) Get() T { return g.v } + type Rizzo struct{} + func (r Rizzo) packRat(v int) Gonzo[Gonzo[Gonzo[int]]] { + return Gonzo[Gonzo[Gonzo[int]]]{v: Gonzo[Gonzo[int]]{v: Gonzo[int]{v: v}}} + } + var _ int = Rizzo{}.packRat(42).Get().Get().Get()`), + want: Info{ + objectFilter: `jim.Rizzo`, + methodFilter: `jim.packRat(int) jim.Gonzo[jim.Gonzo[jim.Gonzo[int]]]`, + }, + }, + { + name: `unexported method resulting in an instance with same type parameter`, + obj: parseObject(t, `sidekick`, + `package jim + type Beaker[T any] struct{} + type Honeydew[S any] struct{} + func (hd Honeydew[S]) sidekick() Beaker[S] { + return Beaker[S]{} + }`), + want: Info{ + objectFilter: `jim.Honeydew[any]`, + methodFilter: `jim.sidekick() jim.Beaker[any]`, + }, + }, + { + name: `struct with self referencing type parameter constraints`, + obj: parseObject(t, `Keys`, + `package jim + func Keys[K comparable, V any, M ~map[K]V](m M) []K { + keys := make([]K, 0, len(m)) + for k := range m { + keys = append(keys, k) + } + return keys + }`), + want: Info{ + objectFilter: `jim.Keys[comparable, any, ~map[comparable]any]`, + }, + }, + { + name: `interface with self referencing type parameter constraints`, + obj: parseObject(t, `ElectricMayhem`, + `package jim + type ElectricMayhem[K comparable, V any, M ~map[K]V] interface { + keys() []K + values() []V + asMap() M + }`), + want: Info{ + objectFilter: `jim.ElectricMayhem[comparable, any, ~map[comparable]any]`, + }, + }, + { + name: `function with recursive referencing type parameter constraints`, + obj: parseObject(t, `doWork`, + `package jim + type Doozer[T any] interface { + comparable + Work() T + } + + func doWork[T Doozer[T]](a T) T { + return a.Work() + }`), + want: Info{ + objectFilter: `jim.doWork[jim.Doozer[jim.Doozer[...]]]`, + }, + }, + { + name: `function with recursive referencing multiple type parameter constraints`, + obj: parseObject(t, `doWork`, + `package jim + type Doozer[T, U any] interface { + Work() T + Play() U + } + + func doWork[T Doozer[T, U], U any](a T) T { + return a.Work() + }`), + want: Info{ + objectFilter: `jim.doWork[jim.Doozer[jim.Doozer[...], any], any]`, + }, + }, + { + name: `function with multiple recursive referencing multiple type parameter constraints`, + obj: parseObject(t, `doWork`, + `package jim + type Doozer[T, U any] interface { + Work() T + Play() U + } + + func doWork[T Doozer[T, U], U Doozer[T, U]](a T) T { + return a.Work() + }`), + want: Info{ + objectFilter: `jim.doWork[jim.Doozer[jim.Doozer[...], jim.Doozer[...]], jim.Doozer[jim.Doozer[...], jim.Doozer[...]]]`, + }, + }, + { + name: `function with multiple recursive referencing type parameter constraints`, + obj: parseObject(t, `doWork`, + `package jim + type Doozer[T any] interface { + Work() T + } + + type Fraggle[U any] interface { + Play() U + } + + func doWork[T Doozer[T], U Fraggle[U]](a T) T { + return a.Work() + }`), + want: Info{ + objectFilter: `jim.doWork[jim.Doozer[jim.Doozer[...]], jim.Fraggle[jim.Fraggle[...]]]`, + }, + }, + { + name: `function with osculating recursive referencing type parameter constraints`, + obj: parseObject(t, `doWork`, + `package jim + type Doozer[T any] interface { + Work() T + } + + type Fraggle[U any] interface { + Play() U + } + + func doWork[T Doozer[U], U Fraggle[T]]() {}`), + want: Info{ + objectFilter: `jim.doWork[jim.Doozer[jim.Fraggle[jim.Doozer[...]]], jim.Fraggle[jim.Doozer[jim.Fraggle[...]]]]`, + }, + }, + } + + t.Run(`SetName`, func(t *testing.T) { + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + d := &testDecl{} + equal(t, d.Dce().unnamed(), true) + equal(t, d.Dce().String(), `[unnamed] -> []`) + t.Log(`object:`, types.ObjectString(tt.obj, nil)) + + d.Dce().SetName(tt.obj) + equal(t, d.Dce().unnamed(), tt.want.unnamed()) + equal(t, d.Dce().objectFilter, tt.want.objectFilter) + equal(t, d.Dce().methodFilter, tt.want.methodFilter) + equalSlices(t, d.Dce().getDeps(), tt.want.getDeps()) + equal(t, d.Dce().String(), tt.want.String()) + }) + } + }) + + t.Run(`addDep`, func(t *testing.T) { + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + d := &testDecl{} + t.Log(`object:`, types.ObjectString(tt.obj, nil)) + + wantDeps := []string{} + if len(tt.want.objectFilter) > 0 { + wantDeps = append(wantDeps, tt.want.objectFilter) + } + if len(tt.want.methodFilter) > 0 { + wantDeps = append(wantDeps, tt.want.methodFilter) + } + sort.Strings(wantDeps) + + c := Collector{} + c.CollectDCEDeps(d, func() { + c.DeclareDCEDep(tt.obj) + }) + equalSlices(t, d.Dce().getDeps(), wantDeps) + }) + } + }) +} + +func Test_Info_SetNameOnlyOnce(t *testing.T) { + pkg := testPackage(`mogwai`) + obj1 := quickVar(pkg, `Gizmo`) + obj2 := quickVar(pkg, `Stripe`) + + decl := &testDecl{} + decl.Dce().SetName(obj1) + + err := capturePanic(t, func() { + decl.Dce().SetName(obj2) + }) + errorMatches(t, err, `^may only set the name once for path/to/mogwai\.Gizmo .*$`) +} + +func Test_Info_UsesDeps(t *testing.T) { + tests := []struct { + name string + id string // identifier to check for usage and instance + line int // line number to find the identifier on + src string + wantDeps []string + }{ + { + name: `usage of specific struct`, + id: `Sinclair`, + line: 5, + src: `package epsilon3 + type Sinclair struct{} + func (s Sinclair) command() { } + func main() { + Sinclair{}.command() //<-- line 5 + }`, + wantDeps: []string{`epsilon3.Sinclair`}, + }, + { + name: `usage of generic struct`, + id: `Sheridan`, + line: 5, + src: `package epsilon3 + type Sheridan[T comparable] struct{} + func (s Sheridan[T]) command() { } + func main() { + Sheridan[string]{}.command() //<-- line 5 + }`, + wantDeps: []string{`epsilon3.Sheridan[string]`}, + }, + { + name: `usage of unexported method of generic struct`, + id: `command`, + line: 5, + src: `package epsilon3 + type Sheridan[T comparable] struct{} + func (s Sheridan[T]) command() { } + func main() { + Sheridan[string]{}.command() //<-- line 5 + }`, + // unexported methods need the method filter for matching with + // unexported methods on interfaces. + wantDeps: []string{ + `epsilon3.Sheridan[string]`, + `epsilon3.command()`, + }, + }, + { + name: `usage of unexported method of generic struct pointer`, + id: `command`, + line: 5, + src: `package epsilon3 + type Sheridan[T comparable] struct{} + func (s *Sheridan[T]) command() { } + func main() { + (&Sheridan[string]{}).command() //<-- line 5 + }`, + // unexported methods need the method filter for matching with + // unexported methods on interfaces. + wantDeps: []string{ + `epsilon3.Sheridan[string]`, + `epsilon3.command()`, + }, + }, + { + name: `invocation of function with implicit type arguments`, + id: `Move`, + line: 5, + src: `package epsilon3 + type Ivanova[T any] struct{} + func Move[T ~string|~int](i Ivanova[T]) { } + func main() { + Move(Ivanova[string]{}) //<-- line 5 + }`, + wantDeps: []string{`epsilon3.Move[string]`}, + }, + { + name: `exported method on a complex generic type`, + id: `Get`, + line: 6, + src: `package epsilon3 + type Garibaldi[T any] struct{ v T } + func (g Garibaldi[T]) Get() T { return g.v } + func main() { + michael := Garibaldi[Garibaldi[Garibaldi[int]]]{v: Garibaldi[Garibaldi[int]]{v: Garibaldi[int]{v: 42}}} + _ = michael.Get() // <-- line 6 + }`, + wantDeps: []string{`epsilon3.Garibaldi[epsilon3.Garibaldi[epsilon3.Garibaldi[int]]]`}, + }, + { + name: `unexported method on a complex generic type`, + id: `get`, + line: 6, + src: `package epsilon3 + type Garibaldi[T any] struct{ v T } + func (g Garibaldi[T]) get() T { return g.v } + func main() { + michael := Garibaldi[Garibaldi[Garibaldi[int]]]{v: Garibaldi[Garibaldi[int]]{v: Garibaldi[int]{v: 42}}} + _ = michael.get() // <-- line 6 + }`, + wantDeps: []string{ + `epsilon3.Garibaldi[epsilon3.Garibaldi[epsilon3.Garibaldi[int]]]`, + `epsilon3.get() epsilon3.Garibaldi[epsilon3.Garibaldi[int]]`, + }, + }, + { + name: `invoke of method with an unnamed interface receiver`, + id: `heal`, + line: 8, + src: `package epsilon3 + type Franklin struct{} + func (g Franklin) heal() {} + func main() { + var stephen interface{ + heal() + } = Franklin{} + stephen.heal() // <-- line 8 + }`, + wantDeps: []string{ + `epsilon3.heal()`, + }, + }, + { + name: `invoke a method with a generic return type via instance`, + // Based on go/1.19.13/x64/test/dictionaryCapture-noinline.go + id: `lennier`, + line: 6, + src: `package epsilon3 + type delenn[T any] struct { a T } + func (d delenn[T]) lennier() T { return d.a } + func cocoon() int { + x := delenn[int]{a: 7} + f := delenn[int].lennier // <-- line 6 + return f(x) + }`, + wantDeps: []string{ + `epsilon3.delenn[int]`, + `epsilon3.lennier() int`, + }, + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + d := &testDecl{} + uses, inst := parseInstanceUse(t, tt.line, tt.id, tt.src) + tArgs := typeListToSlice(inst.TypeArgs) + t.Logf(`object: %s with [%s]`, types.ObjectString(uses, nil), (typesutil.TypeList)(tArgs).String()) + + c := Collector{} + c.CollectDCEDeps(d, func() { + c.DeclareDCEDep(uses, tArgs...) + }) + equalSlices(t, d.Dce().getDeps(), tt.wantDeps) + }) + } +} + +func Test_Info_SpecificCasesDeps(t *testing.T) { + tests := []struct { + name string + obj types.Object + tArgs []types.Type + wantDeps []string + }{ + { + name: `struct instantiation with generic object`, + obj: parseObject(t, `Mikey`, + `package astoria; + type Mikey[T comparable] struct{} + `), + tArgs: []types.Type{types.Typ[types.String]}, + wantDeps: []string{`astoria.Mikey[string]`}, + }, + { + name: `method instantiation with generic object`, + obj: parseObject(t, `brand`, + `package astoria; + type Mikey[T comparable] struct{ a T} + func (m Mikey[T]) brand() T { + return m.a + }`), + tArgs: []types.Type{types.Typ[types.String]}, + wantDeps: []string{ + `astoria.Mikey[string]`, + `astoria.brand() string`, + }, + }, + { + name: `method instantiation with generic object and multiple type parameters`, + obj: parseObject(t, `shuffle`, + `package astoria; + type Chunk[K comparable, V any] struct{ data map[K]V } + func (c Chunk[K, V]) shuffle(k K) V { + return c.data[k] + }`), + tArgs: []types.Type{types.Typ[types.String], types.Typ[types.Int]}, + wantDeps: []string{ + `astoria.Chunk[string, int]`, + `astoria.shuffle(string) int`, + }, + }, + { + name: `method instantiation with generic object renamed type parameters`, + obj: parseObject(t, `shuffle`, + `package astoria; + type Chunk[K comparable, V any] struct{ data map[K]V } + func (c Chunk[T, K]) shuffle(k T) K { + return c.data[k] + }`), + tArgs: []types.Type{types.Typ[types.String], types.Typ[types.Int]}, + wantDeps: []string{ + `astoria.Chunk[string, int]`, + `astoria.shuffle(string) int`, + }, + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + d := &testDecl{} + t.Logf(`object: %s with [%s]`, types.ObjectString(tt.obj, nil), (typesutil.TypeList)(tt.tArgs).String()) + + c := Collector{} + c.CollectDCEDeps(d, func() { + c.DeclareDCEDep(tt.obj, tt.tArgs...) + }) + equalSlices(t, d.Dce().getDeps(), tt.wantDeps) + }) + } +} + +func Test_Info_SetAsAlive(t *testing.T) { + pkg := testPackage(`fantasia`) + + t.Run(`set alive prior to naming`, func(t *testing.T) { + obj := quickVar(pkg, `Falkor`) + decl := &testDecl{} + equal(t, decl.Dce().isAlive(), true) // unnamed is automatically alive + equal(t, decl.Dce().String(), `[unnamed] -> []`) + + decl.Dce().SetAsAlive() + equal(t, decl.Dce().isAlive(), true) // still alive but now explicitly alive + equal(t, decl.Dce().String(), `[alive] [unnamed] -> []`) + + decl.Dce().SetName(obj) + equal(t, decl.Dce().isAlive(), true) // alive because SetAsAlive was called + equal(t, decl.Dce().String(), `[alive] path/to/fantasia.Falkor -> []`) + }) + + t.Run(`set alive after naming`, func(t *testing.T) { + obj := quickVar(pkg, `Artax`) + decl := &testDecl{} + equal(t, decl.Dce().isAlive(), true) // unnamed is automatically alive + equal(t, decl.Dce().String(), `[unnamed] -> []`) + + decl.Dce().SetName(obj) + equal(t, decl.Dce().isAlive(), false) // named so no longer automatically alive + equal(t, decl.Dce().String(), `path/to/fantasia.Artax -> []`) + + decl.Dce().SetAsAlive() + equal(t, decl.Dce().isAlive(), true) // alive because SetAsAlive was called + equal(t, decl.Dce().String(), `[alive] path/to/fantasia.Artax -> []`) + }) +} + +func Test_Selector_JustVars(t *testing.T) { + pkg := testPackage(`tolkien`) + frodo := quickTestDecl(quickVar(pkg, `Frodo`)) + samwise := quickTestDecl(quickVar(pkg, `Samwise`)) + meri := quickTestDecl(quickVar(pkg, `Meri`)) + pippin := quickTestDecl(quickVar(pkg, `Pippin`)) + aragorn := quickTestDecl(quickVar(pkg, `Aragorn`)) + boromir := quickTestDecl(quickVar(pkg, `Boromir`)) + gimli := quickTestDecl(quickVar(pkg, `Gimli`)) + legolas := quickTestDecl(quickVar(pkg, `Legolas`)) + gandalf := quickTestDecl(quickVar(pkg, `Gandalf`)) + fellowship := []*testDecl{ + frodo, samwise, meri, pippin, aragorn, + boromir, gimli, legolas, gandalf, + } + + c := Collector{} + c.CollectDCEDeps(frodo, func() { + c.DeclareDCEDep(samwise.obj) + c.DeclareDCEDep(meri.obj) + c.DeclareDCEDep(pippin.obj) + }) + c.CollectDCEDeps(pippin, func() { + c.DeclareDCEDep(meri.obj) + }) + c.CollectDCEDeps(aragorn, func() { + c.DeclareDCEDep(boromir.obj) + }) + c.CollectDCEDeps(gimli, func() { + c.DeclareDCEDep(legolas.obj) + }) + c.CollectDCEDeps(legolas, func() { + c.DeclareDCEDep(gimli.obj) + }) + c.CollectDCEDeps(gandalf, func() { + c.DeclareDCEDep(frodo.obj) + c.DeclareDCEDep(aragorn.obj) + c.DeclareDCEDep(gimli.obj) + c.DeclareDCEDep(legolas.obj) + }) + + for _, decl := range fellowship { + equal(t, decl.Dce().isAlive(), false) + } + + tests := []struct { + name string + init []*testDecl // which decls to set explicitly alive + want []*testDecl // which decls should be determined as alive + }{ + { + name: `all alive`, + init: fellowship, + want: fellowship, + }, + { + name: `all dead`, + init: []*testDecl{}, + want: []*testDecl{}, + }, + { + name: `Frodo`, + init: []*testDecl{frodo}, + want: []*testDecl{frodo, samwise, meri, pippin}, + }, + { + name: `Sam and Pippin`, + init: []*testDecl{samwise, pippin}, + want: []*testDecl{samwise, meri, pippin}, + }, + { + name: `Gandalf`, + init: []*testDecl{gandalf}, + want: fellowship, + }, + { + name: `Legolas`, + init: []*testDecl{legolas}, + want: []*testDecl{legolas, gimli}, + }, + { + name: `Gimli`, + init: []*testDecl{gimli}, + want: []*testDecl{legolas, gimli}, + }, + { + name: `Boromir`, + init: []*testDecl{boromir}, + want: []*testDecl{boromir}, + }, + { + name: `Aragorn`, + init: []*testDecl{aragorn}, + want: []*testDecl{aragorn, boromir}, + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + for _, decl := range fellowship { + decl.Dce().alive = false + } + for _, decl := range tt.init { + decl.Dce().SetAsAlive() + } + + s := &Selector[*testDecl]{} + for _, decl := range fellowship { + s.Include(decl, false) + } + + selected := s.AliveDecls() + for _, decl := range tt.want { + if _, ok := selected[decl]; !ok { + t.Errorf(`expected %q to be alive`, decl.obj.String()) + } + delete(selected, decl) + } + for decl := range selected { + t.Errorf(`expected %q to be dead`, decl.obj.String()) + } + }) + } +} + +func Test_Selector_SpecificMethods(t *testing.T) { + objects := parseObjects(t, + `package pratchett + + type rincewind struct{} + func (r rincewind) Run() {} + func (r rincewind) hide() {} + + type Vimes struct{} + func (v Vimes) Run() {} + func (v Vimes) Read() {} + + func Vetinari() {}`) + + var ( + // Objects are in read order so pick the objects we want for this test + // while skipping over `r rincewind` and `v Vimes`. + rincewind = quickTestDecl(objects[0]) + rincewindRun = quickTestDecl(objects[2]) + rincewindHide = quickTestDecl(objects[4]) + vimes = quickTestDecl(objects[5]) + vimesRun = quickTestDecl(objects[7]) + vimesRead = quickTestDecl(objects[9]) + vetinari = quickTestDecl(objects[10]) + ) + allDecls := []*testDecl{rincewind, rincewindRun, rincewindHide, vimes, vimesRun, vimesRead, vetinari} + + c := Collector{} + c.CollectDCEDeps(rincewindRun, func() { + c.DeclareDCEDep(rincewind.obj) + }) + c.CollectDCEDeps(rincewindHide, func() { + c.DeclareDCEDep(rincewind.obj) + }) + c.CollectDCEDeps(vimesRun, func() { + c.DeclareDCEDep(vimes.obj) + }) + c.CollectDCEDeps(vimesRead, func() { + c.DeclareDCEDep(vimes.obj) + }) + vetinari.Dce().SetAsAlive() + + tests := []struct { + name string + deps []*testDecl // which decls are vetinari dependent on + want []*testDecl // which decls should be determined as alive + }{ + { + name: `no deps`, + deps: []*testDecl{}, + want: []*testDecl{vetinari}, + }, + { + name: `structs`, + deps: []*testDecl{rincewind, vimes}, + // rincewindHide is not included because it is not exported and not used. + want: []*testDecl{rincewind, rincewindRun, vimes, vimesRun, vimesRead, vetinari}, + }, + { + name: `exported method`, + deps: []*testDecl{rincewind, rincewindRun}, + want: []*testDecl{rincewind, rincewindRun, vetinari}, + }, + { + name: `unexported method`, + deps: []*testDecl{rincewind, rincewindHide}, + want: []*testDecl{rincewind, rincewindRun, rincewindHide, vetinari}, + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + vetinari.Dce().deps = nil // reset deps + c.CollectDCEDeps(vetinari, func() { + for _, decl := range tt.deps { + c.DeclareDCEDep(decl.obj) + } + }) + + s := Selector[*testDecl]{} + for _, decl := range allDecls { + s.Include(decl, false) + } + selected := s.AliveDecls() + for _, decl := range tt.want { + if _, ok := selected[decl]; !ok { + t.Errorf(`expected %q to be alive`, decl.obj.String()) + } + delete(selected, decl) + } + for decl := range selected { + t.Errorf(`expected %q to be dead`, decl.obj.String()) + } + }) + } +} + +type testDecl struct { + obj types.Object // should match the object used in Dce.SetName when set + dce Info +} + +func (d *testDecl) Dce() *Info { + return &d.dce +} + +func testPackage(name string) *types.Package { + return types.NewPackage(`path/to/`+name, name) +} + +func quickTestDecl(o types.Object) *testDecl { + d := &testDecl{obj: o} + d.Dce().SetName(o) + return d +} + +func quickVar(pkg *types.Package, name string) *types.Var { + return types.NewVar(token.NoPos, pkg, name, types.Typ[types.Int]) +} + +func newTypeInfo() *types.Info { + return &types.Info{ + Defs: map[*ast.Ident]types.Object{}, + Uses: map[*ast.Ident]types.Object{}, + Instances: map[*ast.Ident]types.Instance{}, + } +} + +func parseObject(t *testing.T, name, source string) types.Object { + t.Helper() + objects := parseObjects(t, source) + for _, obj := range objects { + if obj.Name() == name { + return obj + } + } + t.Fatalf(`object %q not found`, name) + return nil +} + +func parseObjects(t *testing.T, source string) []types.Object { + t.Helper() + fset := token.NewFileSet() + info := newTypeInfo() + parsePackage(t, source, fset, info) + objects := make([]types.Object, 0, len(info.Defs)) + for _, obj := range info.Defs { + if obj != nil { + objects = append(objects, obj) + } + } + sort.Slice(objects, func(i, j int) bool { + return objects[i].Pos() < objects[j].Pos() + }) + return objects +} + +func parseInstanceUse(t *testing.T, lineNo int, idName, source string) (types.Object, types.Instance) { + t.Helper() + fset := token.NewFileSet() + info := newTypeInfo() + parsePackage(t, source, fset, info) + for id, obj := range info.Uses { + if id.Name == idName && fset.Position(id.Pos()).Line == lineNo { + return obj, info.Instances[id] + } + } + t.Fatalf(`failed to find %s on line %d`, idName, lineNo) + return nil, types.Instance{} +} + +func parsePackage(t *testing.T, source string, fset *token.FileSet, info *types.Info) *types.Package { + t.Helper() + f, err := parser.ParseFile(fset, `test.go`, source, 0) + if err != nil { + t.Fatal(`parsing source:`, err) + } + + conf := types.Config{ + Importer: importer.Default(), + DisableUnusedImportCheck: true, + } + pkg, err := conf.Check(f.Name.Name, fset, []*ast.File{f}, info) + if err != nil { + t.Fatal(`type checking:`, err) + } + return pkg +} + +func capturePanic(t *testing.T, f func()) (err error) { + t.Helper() + defer func() { + t.Helper() + if r := recover(); r != nil { + if err2, ok := r.(error); ok { + err = err2 + return + } + t.Errorf(`expected an error to be panicked but got (%[1]T) %[1]#v`, r) + return + } + t.Error(`expected a panic but got none`) + }() + + f() + return nil +} + +func errorMatches(t *testing.T, err error, wantPattern string) { + t.Helper() + re := regexp.MustCompile(wantPattern) + if got := fmt.Sprint(err); !re.MatchString(got) { + t.Errorf(`expected error %q to match %q`, got, re.String()) + } +} + +func depCount(t *testing.T, decl *testDecl, want int) { + t.Helper() + if got := len(decl.Dce().deps); got != want { + t.Errorf(`expected %d deps but got %d`, want, got) + } +} + +func equal[T comparable](t *testing.T, got, want T) { + t.Helper() + if got != want { + t.Errorf("Unexpected value was gotten:\n\texp: %#v\n\tgot: %#v", want, got) + } +} + +func equalSlices[T comparable](t *testing.T, got, want []T) { + t.Helper() + if len(got) != len(want) { + t.Errorf("expected %d but got %d\n\texp: %#v\n\tgot: %#v", len(want), len(got), want, got) + return + } + for i, wantElem := range want { + equal(t, got[i], wantElem) + } +} diff --git a/compiler/internal/dce/filters.go b/compiler/internal/dce/filters.go new file mode 100644 index 000000000..420fd4310 --- /dev/null +++ b/compiler/internal/dce/filters.go @@ -0,0 +1,344 @@ +package dce + +import ( + "go/types" + "sort" + "strconv" + "strings" +) + +// getFilters determines the DCE filters for the given object. +// This will return an object filter and optionally return a method filter. +// +// Typically, the object filter will always be set and the method filter +// will be empty unless the object is an unexported method. +// However, when the object is a method invocation on an unnamed interface type +// the object filter will be empty and only the method filter will be set. +// The later shouldn't happen when naming a declaration but only when creating +// dependencies. +func getFilters(o types.Object, tArgs []types.Type) (objectFilter, methodFilter string) { + if f, ok := o.(*types.Func); ok { + sig := f.Type().(*types.Signature) + if recv := sig.Recv(); recv != nil { + // The object is a method so the object filter is the receiver type + // if the receiver type is named, otherwise it's an unnamed interface. + typ := recv.Type() + if ptrType, ok := typ.(*types.Pointer); ok { + typ = ptrType.Elem() + } + if len(tArgs) == 0 { + tArgs = getTypeArgs(typ) + } + if named, ok := typ.(*types.Named); ok { + objectFilter = getObjectFilter(named.Obj(), tArgs) + } + + // The method is not exported so we only need the method filter. + if !o.Exported() { + methodFilter = getMethodFilter(o, tArgs) + } + return + } + } + + // The object is not a method so we only need the object filter. + objectFilter = getObjectFilter(o, tArgs) + return +} + +// getObjectFilter returns the object filter that functions as the primary +// name when determining if a declaration is alive or not. +// See [naming design] for more information. +// +// [naming design]: https://github.com/gopherjs/gopherjs/compiler/internal/dce/README.md#naming +func getObjectFilter(o types.Object, tArgs []types.Type) string { + return (&filterGen{argTypeRemap: tArgs}).Object(o, tArgs) +} + +// getMethodFilter returns the method filter that functions as the secondary +// name when determining if a declaration is alive or not. +// See [naming design] for more information. +// +// [naming design]: https://github.com/gopherjs/gopherjs/compiler/internal/dce/README.md#naming +func getMethodFilter(o types.Object, tArgs []types.Type) string { + if sig, ok := o.Type().(*types.Signature); ok { + if len(tArgs) == 0 { + if recv := sig.Recv(); recv != nil { + tArgs = getTypeArgs(recv.Type()) + } + } + gen := &filterGen{argTypeRemap: tArgs} + return objectName(o) + gen.Signature(sig) + } + return `` +} + +// objectName returns the name part of a filter name, +// including the package path, if available. +// +// This is different from `o.Id` since it always includes the package path +// when available and doesn't add "_." when not available. +func objectName(o types.Object) string { + if o.Pkg() != nil { + return o.Pkg().Path() + `.` + o.Name() + } + return o.Name() +} + +// getTypeArgs gets the type arguments for the given type +// wether they are type arguments or type parameters. +func getTypeArgs(typ types.Type) []types.Type { + switch t := typ.(type) { + case *types.Pointer: + return getTypeArgs(t.Elem()) + case *types.Named: + if typeArgs := t.TypeArgs(); typeArgs != nil { + return typeListToSlice(typeArgs) + } + if typeParams := t.TypeParams(); typeParams != nil { + return typeParamListToSlice(typeParams) + } + case *types.Signature: + if typeParams := t.RecvTypeParams(); typeParams != nil { + return typeParamListToSlice(typeParams) + } + if typeParams := t.TypeParams(); typeParams != nil { + return typeParamListToSlice(typeParams) + } + } + return nil +} + +// typeListToSlice returns the list of type arguments for the type arguments. +func typeListToSlice(typeArgs *types.TypeList) []types.Type { + tArgs := make([]types.Type, typeArgs.Len()) + for i := range tArgs { + tArgs[i] = typeArgs.At(i) + } + return tArgs +} + +// typeParamListToSlice returns the list of type arguments for the type parameters. +func typeParamListToSlice(typeParams *types.TypeParamList) []types.Type { + tParams := make([]types.Type, typeParams.Len()) + for i := range tParams { + tParams[i] = typeParams.At(i).Constraint() + } + return tParams +} + +type processingGroup struct { + o types.Object + tArgs []types.Type +} + +func (p processingGroup) is(o types.Object, tArgs []types.Type) bool { + if len(p.tArgs) != len(tArgs) || p.o != o { + return false + } + for i, tArg := range tArgs { + if p.tArgs[i] != tArg { + return false + } + } + return true +} + +type filterGen struct { + // argTypeRemap is the type arguments in the same order as the + // type parameters in the top level object such that the type parameters + // index can be used to get the type argument. + argTypeRemap []types.Type + inProgress []processingGroup +} + +func (gen *filterGen) startProcessing(o types.Object, tArgs []types.Type) bool { + for _, p := range gen.inProgress { + if p.is(o, tArgs) { + return false + } + } + gen.inProgress = append(gen.inProgress, processingGroup{o, tArgs}) + return true +} + +func (gen *filterGen) stopProcessing() { + gen.inProgress = gen.inProgress[:len(gen.inProgress)-1] +} + +// Object returns an object filter or filter part for an object. +func (gen *filterGen) Object(o types.Object, tArgs []types.Type) string { + filter := objectName(o) + + // Add additional type information for generics and instances. + if len(tArgs) == 0 { + tArgs = getTypeArgs(o.Type()) + } + if len(tArgs) > 0 { + // Avoid infinite recursion in type arguments by + // tracking the current object and type arguments being processed + // and skipping if already in progress. + if gen.startProcessing(o, tArgs) { + filter += gen.TypeArgs(tArgs) + gen.stopProcessing() + } else { + filter += `[...]` + } + } + + return filter +} + +// Signature returns the filter part containing the signature +// parameters and results for a function or method, e.g. `(int)(bool,error)`. +func (gen *filterGen) Signature(sig *types.Signature) string { + filter := `(` + gen.Tuple(sig.Params(), sig.Variadic()) + `)` + switch sig.Results().Len() { + case 0: + break + case 1: + filter += ` ` + gen.Type(sig.Results().At(0).Type()) + default: + filter += `(` + gen.Tuple(sig.Results(), false) + `)` + } + return filter +} + +// TypeArgs returns the filter part containing the type +// arguments, e.g. `[any,int|string]`. +func (gen *filterGen) TypeArgs(tArgs []types.Type) string { + parts := make([]string, len(tArgs)) + for i, tArg := range tArgs { + parts[i] = gen.Type(tArg) + } + return `[` + strings.Join(parts, `, `) + `]` +} + +// Tuple returns the filter part containing parameter or result +// types for a function, e.g. `(int,string)`, `(int,...string)`. +func (gen *filterGen) Tuple(t *types.Tuple, variadic bool) string { + count := t.Len() + parts := make([]string, count) + for i := range parts { + argType := t.At(i).Type() + if i == count-1 && variadic { + if slice, ok := argType.(*types.Slice); ok { + argType = slice.Elem() + } + parts[i] = `...` + gen.Type(argType) + } else { + parts[i] = gen.Type(argType) + } + } + return strings.Join(parts, `, `) +} + +// Type returns the filter part for a single type. +func (gen *filterGen) Type(typ types.Type) string { + switch t := typ.(type) { + case types.Object: + return gen.Object(t, nil) + + case *types.Array: + return `[` + strconv.FormatInt(t.Len(), 10) + `]` + gen.Type(t.Elem()) + case *types.Chan: + return `chan ` + gen.Type(t.Elem()) + case *types.Interface: + return gen.Interface(t) + case *types.Map: + return `map[` + gen.Type(t.Key()) + `]` + gen.Type(t.Elem()) + case *types.Named: + // Get type args from named instance not generic object + return gen.Object(t.Obj(), getTypeArgs(t)) + case *types.Pointer: + return `*` + gen.Type(t.Elem()) + case *types.Signature: + return `func` + gen.Signature(t) + case *types.Slice: + return `[]` + gen.Type(t.Elem()) + case *types.Struct: + return gen.Struct(t) + case *types.TypeParam: + return gen.TypeParam(t) + default: + // Anything else, like basics, just stringify normally. + return t.String() + } +} + +// Union returns the filter part for a union of types from an type parameter +// constraint, e.g. `~string|int|~float64`. +func (gen *filterGen) Union(u *types.Union) string { + parts := make([]string, u.Len()) + for i := range parts { + term := u.Term(i) + part := gen.Type(term.Type()) + if term.Tilde() { + part = "~" + part + } + parts[i] = part + } + // Sort the union so that "string|int" matches "int|string". + sort.Strings(parts) + return strings.Join(parts, `|`) +} + +// Interface returns the filter part for an interface type or +// an interface for a type parameter constraint. +func (gen *filterGen) Interface(inter *types.Interface) string { + // Collect all method constraints with method names and signatures. + parts := make([]string, inter.NumMethods()) + for i := range parts { + fn := inter.Method(i) + parts[i] = fn.Id() + gen.Signature(fn.Type().(*types.Signature)) + } + // Add any union constraints. + for i := 0; i < inter.NumEmbeddeds(); i++ { + if union, ok := inter.EmbeddedType(i).(*types.Union); ok { + parts = append(parts, gen.Union(union)) + } + } + // Sort the parts of the interface since the order doesn't matter. + // e.g. `interface { a(); b() }` is the same as `interface { b(); a() }`. + sort.Strings(parts) + + if len(parts) == 0 { + return `any` + } + if inter.NumMethods() == 0 && len(parts) == 1 { + return parts[0] // single constraint union, i.e. `bool|~int|string` + } + return `interface{ ` + strings.Join(parts, `; `) + ` }` +} + +// Struct returns the filter part for a struct type. +func (gen *filterGen) Struct(s *types.Struct) string { + if s.NumFields() == 0 { + return `struct{}` + } + parts := make([]string, s.NumFields()) + for i := range parts { + f := s.Field(i) + // The field name and order is required to be part of the filter since + // struct matching rely on field names too. Tags are not needed. + // See https://go.dev/ref/spec#Conversions + parts[i] = f.Id() + ` ` + gen.Type(f.Type()) + } + return `struct{ ` + strings.Join(parts, `; `) + ` }` +} + +// TypeParam returns the filter part for a type parameter. +// If there is an argument remap, it will use the remapped type +// so long as it doesn't map to itself. +func (gen *filterGen) TypeParam(t *types.TypeParam) string { + index := t.Index() + if index >= 0 && index < len(gen.argTypeRemap) { + if inst := gen.argTypeRemap[index]; inst != t { + return gen.Type(inst) + } + } + if t.Constraint() == nil { + return `any` + } + return gen.Type(t.Constraint()) +} diff --git a/compiler/internal/dce/info.go b/compiler/internal/dce/info.go new file mode 100644 index 000000000..6a45e9ef3 --- /dev/null +++ b/compiler/internal/dce/info.go @@ -0,0 +1,157 @@ +package dce + +import ( + "bytes" + "encoding/gob" + "fmt" + "go/types" + "sort" + "strings" +) + +// Info contains information used by the dead-code elimination (DCE) logic to +// determine whether a declaration is alive or dead. +type Info struct { + // alive indicates if the declaration is marked as alive + // and will not be eliminated. + alive bool + + // objectFilter is the primary DCE name for a declaration. + // This will be the variable, function, or type identifier. + // For methods it is the receiver type identifier. + // If empty, the declaration is assumed to be alive. + objectFilter string + + // methodFilter is the secondary DCE name for a declaration. + // This will be empty if objectFilter is empty. + // This will be set to a qualified method name if the objectFilter + // can not determine if the declaration is alive on it's own. + // See ./README.md for more information. + methodFilter string + + // Set of fully qualified (including package path) DCE symbol + // and/or method names that this DCE declaration depends on. + deps map[string]struct{} +} + +// String gets a human-readable representation of the DCE info. +func (d *Info) String() string { + tags := `` + if d.alive { + tags += `[alive] ` + } + if d.unnamed() { + tags += `[unnamed] ` + } + names := []string{} + if len(d.objectFilter) > 0 { + names = append(names, d.objectFilter+` `) + } + if len(d.methodFilter) > 0 { + names = append(names, d.methodFilter+` `) + } + return tags + strings.Join(names, `& `) + `-> [` + strings.Join(d.getDeps(), `, `) + `]` +} + +// unnamed returns true if SetName has not been called for this declaration. +// This indicates that the DCE is not initialized. +func (d *Info) unnamed() bool { + return d.objectFilter == `` && d.methodFilter == `` +} + +// isAlive returns true if the declaration is marked as alive. +// +// Returns true if SetAsAlive was called on this declaration or +// if SetName was not called meaning the DCE is not initialized. +func (d *Info) isAlive() bool { + return d.alive || d.unnamed() +} + +// SetAsAlive marks the declaration as alive, meaning it will not be eliminated. +// +// This should be called by an entry point (like main() or init() functions) +// or a variable initializer which has a side effect, consider it live. +func (d *Info) SetAsAlive() { + d.alive = true +} + +// SetName sets the name used by DCE to represent the declaration +// this DCE info is attached to. +// +// The given optional type arguments are used to when the object is a +// function with type parameters or anytime the object doesn't carry them. +// If not given, this attempts to get the type arguments from the object. +func (d *Info) SetName(o types.Object, tArgs ...types.Type) { + if !d.unnamed() { + panic(fmt.Errorf(`may only set the name once for %s`, d.String())) + } + + // Determine name(s) for DCE. + d.objectFilter, d.methodFilter = getFilters(o, tArgs) +} + +// addDep add a declaration dependencies used by DCE +// for the declaration this DCE info is attached to. +func (d *Info) addDep(o types.Object, tArgs []types.Type) { + objectFilter, methodFilter := getFilters(o, tArgs) + d.addDepName(objectFilter) + d.addDepName(methodFilter) +} + +// addDepName adds a declaration dependency by name. +func (d *Info) addDepName(depName string) { + if len(depName) > 0 { + if d.deps == nil { + d.deps = make(map[string]struct{}) + } + d.deps[depName] = struct{}{} + } +} + +// getDeps gets the dependencies for the declaration sorted by name. +func (id *Info) getDeps() []string { + deps := make([]string, len(id.deps)) + i := 0 + for dep := range id.deps { + deps[i] = dep + i++ + } + sort.Strings(deps) + return deps +} + +type serializableInfo struct { + Alive bool + ObjectFilter string + MethodFilter string + Deps []string +} + +func (id *Info) GobEncode() ([]byte, error) { + si := serializableInfo{ + Alive: id.alive, + ObjectFilter: id.objectFilter, + MethodFilter: id.methodFilter, + Deps: id.getDeps(), + } + + buf := &bytes.Buffer{} + err := gob.NewEncoder(buf).Encode(si) + return buf.Bytes(), err +} + +func (id *Info) GobDecode(data []byte) error { + var si serializableInfo + if err := gob.NewDecoder(bytes.NewReader(data)).Decode(&si); err != nil { + return err + } + + id.alive = si.Alive + id.objectFilter = si.ObjectFilter + id.methodFilter = si.MethodFilter + id.deps = make(map[string]struct{}, len(si.Deps)) + for _, dep := range si.Deps { + id.deps[dep] = struct{}{} + } + return nil +} diff --git a/compiler/internal/dce/selector.go b/compiler/internal/dce/selector.go new file mode 100644 index 000000000..3dff49028 --- /dev/null +++ b/compiler/internal/dce/selector.go @@ -0,0 +1,93 @@ +package dce + +// DeclConstraint is type constraint for any code declaration that has +// dead-code elimination (DCE) information attached to it and will be +// used in a set. +type DeclConstraint interface { + Decl + comparable +} + +// Selector gathers all declarations that are still alive after dead-code elimination. +type Selector[D DeclConstraint] struct { + byFilter map[string][]*declInfo[D] + + // A queue of live decls to find other live decls. + pendingDecls []D +} + +type declInfo[D DeclConstraint] struct { + decl D + objectFilter string + methodFilter string +} + +// Include will add a new declaration to be checked as alive or not. +func (s *Selector[D]) Include(decl D, implementsLink bool) { + if s.byFilter == nil { + s.byFilter = make(map[string][]*declInfo[D]) + } + + dce := decl.Dce() + + if dce.isAlive() { + s.pendingDecls = append(s.pendingDecls, decl) + return + } + + if implementsLink { + s.pendingDecls = append(s.pendingDecls, decl) + } + + info := &declInfo[D]{decl: decl} + + if dce.objectFilter != `` { + info.objectFilter = dce.objectFilter + s.byFilter[info.objectFilter] = append(s.byFilter[info.objectFilter], info) + } + + if dce.methodFilter != `` { + info.methodFilter = dce.methodFilter + s.byFilter[info.methodFilter] = append(s.byFilter[info.methodFilter], info) + } +} + +func (s *Selector[D]) popPending() D { + max := len(s.pendingDecls) - 1 + d := s.pendingDecls[max] + s.pendingDecls = s.pendingDecls[:max] + return d +} + +// AliveDecls returns a set of declarations that are still alive +// after dead-code elimination. +// This should only be called once all declarations have been included. +func (s *Selector[D]) AliveDecls() map[D]struct{} { + dceSelection := make(map[D]struct{}) // Known live decls. + for len(s.pendingDecls) != 0 { + d := s.popPending() + dce := d.Dce() + + dceSelection[d] = struct{}{} // Mark the decl as live. + + // Consider all decls the current one is known to depend on and possible add + // them to the live queue. + for _, dep := range dce.getDeps() { + if infos, ok := s.byFilter[dep]; ok { + delete(s.byFilter, dep) + for _, info := range infos { + if info.objectFilter == dep { + info.objectFilter = `` + } + if info.methodFilter == dep { + info.methodFilter = `` + } + if info.objectFilter == `` && info.methodFilter == `` { + s.pendingDecls = append(s.pendingDecls, info.decl) + } + } + } + } + } + return dceSelection +} diff --git a/compiler/internal/symbol/symbol.go b/compiler/internal/symbol/symbol.go new file mode 100644 index 000000000..d460ea86d --- /dev/null +++ b/compiler/internal/symbol/symbol.go @@ -0,0 +1,65 @@ +package symbol + +import ( + "go/types" + "strings" +) + +// Name uniquely identifies a named symbol within a program. +// +// This is a logical equivalent of a symbol name used by traditional linkers. +// The following properties should hold true: +// +// - Each named symbol within a program has a unique Name. +// - Similarly named methods of different types will have different symbol names. +// - The string representation is opaque and should not be attempted to reversed +// to a struct form. +type Name struct { + PkgPath string // Full package import path. + Name string // Symbol name. +} + +// New constructs SymName for a given named symbol. +func New(o types.Object) Name { + pkgPath := `_` + if pkg := o.Pkg(); pkg != nil { + pkgPath = pkg.Path() + } + + if fun, ok := o.(*types.Func); ok { + sig := fun.Type().(*types.Signature) + if recv := sig.Recv(); recv != nil { + // Special case: disambiguate names for different types' methods. + typ := recv.Type() + if ptr, ok := typ.(*types.Pointer); ok { + return Name{ + PkgPath: pkgPath, + Name: "(*" + ptr.Elem().(*types.Named).Obj().Name() + ")." + o.Name(), + } + } + return Name{ + PkgPath: pkgPath, + Name: typ.(*types.Named).Obj().Name() + "." + o.Name(), + } + } + } + return Name{ + PkgPath: pkgPath, + Name: o.Name(), + } +} + +func (n Name) String() string { return n.PkgPath + "." + n.Name } + +func (n Name) IsMethod() (recv string, method string, ok bool) { + pos := strings.IndexByte(n.Name, '.') + if pos == -1 { + return + } + recv, method, ok = n.Name[:pos], n.Name[pos+1:], true + size := len(recv) + if size > 2 && recv[0] == '(' && recv[size-1] == ')' { + recv = recv[1 : size-1] + } + return +} diff --git a/compiler/internal/symbol/symbol_test.go b/compiler/internal/symbol/symbol_test.go new file mode 100644 index 000000000..778e3b1e0 --- /dev/null +++ b/compiler/internal/symbol/symbol_test.go @@ -0,0 +1,53 @@ +package symbol + +import ( + "go/types" + "testing" + + "github.com/gopherjs/gopherjs/internal/srctesting" +) + +func TestName(t *testing.T) { + const src = `package testcase + + func AFunction() {} + type AType struct {} + func (AType) AMethod() {} + func (*AType) APointerMethod() {} + var AVariable int32 + ` + + f := srctesting.New(t) + _, pkg := f.Check("pkg/test", f.Parse("test.go", src)) + + tests := []struct { + obj types.Object + want Name + }{ + { + obj: pkg.Scope().Lookup("AFunction"), + want: Name{PkgPath: "pkg/test", Name: "AFunction"}, + }, { + obj: pkg.Scope().Lookup("AType"), + want: Name{PkgPath: "pkg/test", Name: "AType"}, + }, { + obj: types.NewMethodSet(pkg.Scope().Lookup("AType").Type()).Lookup(pkg, "AMethod").Obj(), + want: Name{PkgPath: "pkg/test", Name: "AType.AMethod"}, + }, { + obj: types.NewMethodSet(types.NewPointer(pkg.Scope().Lookup("AType").Type())).Lookup(pkg, "APointerMethod").Obj(), + want: Name{PkgPath: "pkg/test", Name: "(*AType).APointerMethod"}, + }, { + obj: pkg.Scope().Lookup("AVariable"), + want: Name{PkgPath: "pkg/test", Name: "AVariable"}, + }, + } + + for _, test := range tests { + t.Run(test.obj.Name(), func(t *testing.T) { + got := New(test.obj) + if got != test.want { + t.Errorf("NewSymName(%q) returned %#v, want: %#v", test.obj.Name(), got, test.want) + } + }) + } +} diff --git a/compiler/internal/typeparams/collect.go b/compiler/internal/typeparams/collect.go new file mode 100644 index 000000000..940690e83 --- /dev/null +++ b/compiler/internal/typeparams/collect.go @@ -0,0 +1,394 @@ +package typeparams + +import ( + "fmt" + "go/ast" + "go/types" + "strings" + + "github.com/gopherjs/gopherjs/compiler/typesutil" + "github.com/gopherjs/gopherjs/internal/govendor/subst" +) + +// Resolver translates types defined in terms of type parameters into concrete +// types, given a mapping from type params to type arguments. +type Resolver struct { + tParams *types.TypeParamList + tArgs []types.Type + parent *Resolver + + // subster is the substitution helper that will perform the actual + // substitutions. This maybe nil when there are no substitutions but + // will still usable when nil. + subster *subst.Subster + selMemo map[typesutil.Selection]typesutil.Selection +} + +// NewResolver creates a new Resolver with tParams entries mapping to tArgs +// entries with the same index. +func NewResolver(tc *types.Context, tParams *types.TypeParamList, tArgs []types.Type, parent *Resolver) *Resolver { + r := &Resolver{ + tParams: tParams, + tArgs: tArgs, + parent: parent, + subster: subst.New(tc, tParams, tArgs), + selMemo: map[typesutil.Selection]typesutil.Selection{}, + } + return r +} + +// TypeParams is the list of type parameters that this resolver +// (not any parent) will substitute. +func (r *Resolver) TypeParams() *types.TypeParamList { + if r == nil { + return nil + } + return r.tParams +} + +// TypeArgs is the list of type arguments that this resolver +// (not any parent) will resolve to. +func (r *Resolver) TypeArgs() []types.Type { + if r == nil { + return nil + } + return r.tArgs +} + +// Parent is the resolver for the function or method that this resolver +// is nested in. This may be nil if the context for this resolver is not +// nested in another generic function or method. +func (r *Resolver) Parent() *Resolver { + if r == nil { + return nil + } + return r.parent +} + +// Substitute replaces references to type params in the provided type definition +// with the corresponding concrete types. +func (r *Resolver) Substitute(typ types.Type) types.Type { + if r == nil || typ == nil { + return typ // No substitutions to be made. + } + typ = r.subster.Type(typ) + typ = r.parent.Substitute(typ) + return typ +} + +// SubstituteAll same as Substitute, but accepts a TypeList are returns +// substitution results as a slice in the same order. +func (r *Resolver) SubstituteAll(list *types.TypeList) []types.Type { + result := make([]types.Type, list.Len()) + for i := range result { + result[i] = r.Substitute(list.At(i)) + } + return result +} + +// SubstituteSelection replaces a method of field selection on a generic type +// defined in terms of type parameters with a method selection on a concrete +// instantiation of the type. +func (r *Resolver) SubstituteSelection(sel typesutil.Selection) typesutil.Selection { + if r == nil || sel == nil { + return sel // No substitutions to be made. + } + if concrete, ok := r.selMemo[sel]; ok { + return concrete + } + + switch sel.Kind() { + case types.MethodExpr, types.MethodVal, types.FieldVal: + recv := r.Substitute(sel.Recv()) + if types.Identical(recv, sel.Recv()) { + return sel // Non-generic receiver, no substitution necessary. + } + + // Look up the method on the instantiated receiver. + pkg := sel.Obj().Pkg() + obj, index, _ := types.LookupFieldOrMethod(recv, true, pkg, sel.Obj().Name()) + if obj == nil { + panic(fmt.Errorf("failed to lookup field %q in type %v", sel.Obj().Name(), recv)) + } + typ := obj.Type() + + if sel.Kind() == types.MethodExpr { + typ = typesutil.RecvAsFirstArg(typ.(*types.Signature)) + } + concrete := typesutil.NewSelection(sel.Kind(), recv, index, obj, typ) + r.selMemo[sel] = concrete + return concrete + default: + panic(fmt.Errorf("unexpected selection kind %v: %v", sel.Kind(), sel)) + } +} + +// String gets a strings representation of the resolver for debugging. +func (r *Resolver) String() string { + if r == nil { + return `{}` + } + + parts := make([]string, 0, len(r.tArgs)) + for i, ta := range r.tArgs { + parts = append(parts, fmt.Sprintf("%s->%s", r.tParams.At(i), ta)) + } + + nestStr := `` + if r.parent != nil { + nestStr = r.parent.String() + `:` + } + return nestStr + `{` + strings.Join(parts, `, `) + `}` +} + +// visitor implements ast.Visitor and collects instances of generic types and +// functions into an InstanceSet. +// +// When traversing an AST subtree corresponding to a generic type, method or +// function, Resolver must be provided mapping the type parameters into concrete +// types. +type visitor struct { + instances *PackageInstanceSets + resolver *Resolver + info *types.Info + tNest []types.Type // The type arguments for a nested context. +} + +var _ ast.Visitor = &visitor{} + +func (c *visitor) Visit(n ast.Node) ast.Visitor { + if ident, ok := n.(*ast.Ident); ok { + c.visitIdent(ident) + } + return c +} + +func (c *visitor) visitIdent(ident *ast.Ident) { + if inst, ok := c.info.Instances[ident]; ok { + // Found the use of a generic type or function. + c.visitInstance(ident, inst) + } + + if len(c.resolver.TypeArgs()) > 0 { + if obj, ok := c.info.Defs[ident]; ok && obj != nil { + // Found instance of a type defined inside a generic context. + c.visitNestedType(obj) + } + } +} + +func (c *visitor) visitInstance(ident *ast.Ident, inst types.Instance) { + obj := c.info.Uses[ident] + tArgs := inst.TypeArgs + + // For types embedded in structs, the object the identifier resolves to is a + // *types.Var representing the implicitly declared struct field. However, the + // instance relates to the *types.TypeName behind the field type, which we + // obtain here. + typ := obj.Type() + if ptr, ok := typ.(*types.Pointer); ok { + typ = ptr.Elem() + } + if t, ok := typ.(*types.Named); ok { + obj = t.Obj() + } + + // If the object is defined in the same scope as the instance, + // then we apply the current nested type arguments. + var tNest []types.Type + if obj.Parent().Contains(ident.Pos()) { + tNest = c.tNest + } + + c.addInstance(obj, tArgs, tNest) +} + +func (c *visitor) visitNestedType(obj types.Object) { + if _, ok := obj.(*types.TypeName); !ok { + // Found a variable or function, not a type, so skip it. + return + } + + typ := obj.Type() + if ptr, ok := typ.(*types.Pointer); ok { + typ = ptr.Elem() + } + + t, ok := typ.(*types.Named) + if !ok || t.TypeParams().Len() > 0 { + // Found a generic type or an unnamed type (e.g. type parameter). + // Don't add generic types yet because they + // will be added when we find an instance of them. + return + } + + c.addInstance(obj, nil, c.resolver.TypeArgs()) +} + +func (c *visitor) addInstance(obj types.Object, tArgList *types.TypeList, tNest []types.Type) { + tArgs := c.resolver.SubstituteAll(tArgList) + if isGeneric(tArgs...) { + // Skip any instances that still have type parameters in them after + // substitution. This occurs when a type is defined while nested + // in a generic context and is not fully instantiated yet. + // We need to wait until we find a full instantiation of the type. + return + } + + c.instances.Add(Instance{ + Object: obj, + TArgs: tArgs, + TNest: tNest, + }) + + if t, ok := obj.Type().(*types.Named); ok { + for i := 0; i < t.NumMethods(); i++ { + method := t.Method(i) + c.instances.Add(Instance{ + Object: method.Origin(), + TArgs: tArgs, + TNest: tNest, + }) + } + } +} + +// seedVisitor implements ast.Visitor that collects information necessary to +// kickstart generic instantiation discovery. +// +// It serves double duty: +// - Builds a map from types.Object instances representing generic types, +// methods and functions to AST nodes that define them. +// - Collects an initial set of generic instantiations in the non-generic code. +type seedVisitor struct { + visitor + objMap map[types.Object]ast.Node + mapOnly bool // Only build up objMap, ignore any instances. +} + +var _ ast.Visitor = &seedVisitor{} + +func (c *seedVisitor) Visit(n ast.Node) ast.Visitor { + // Generic functions, methods and types require type arguments to scan for + // generic instantiations, remember their node for later and do not descend + // further. + switch n := n.(type) { + case *ast.FuncDecl: + obj := c.info.Defs[n.Name] + sig := obj.Type().(*types.Signature) + if sig.TypeParams().Len() != 0 || sig.RecvTypeParams().Len() != 0 { + c.objMap[obj] = n + return &seedVisitor{ + visitor: c.visitor, + objMap: c.objMap, + mapOnly: true, + } + } + case *ast.TypeSpec: + obj := c.info.Defs[n.Name] + named, ok := obj.Type().(*types.Named) + if !ok { + break + } + if named.TypeParams().Len() != 0 && named.TypeArgs().Len() == 0 { + c.objMap[obj] = n + return nil + } + } + + if !c.mapOnly { + // Otherwise check for fully defined instantiations and descend further into + // the AST tree. + c.visitor.Visit(n) + } + return c +} + +// Collector scans type-checked AST tree and adds discovered generic type and +// function instances to the InstanceSet. +// +// Collector will scan non-generic code for any instantiations of generic types +// or functions and add them to the InstanceSet. Then it will scan generic types +// and function with discovered sets of type arguments for more instantiations, +// until no new ones are discovered. +// +// InstanceSet may contain unprocessed instances of generic types and functions, +// which will be also scanned, for example found in depending packages. +// +// Note that instances of generic type methods are automatically added to the +// set whenever their receiver type instance is encountered. +type Collector struct { + TContext *types.Context + Info *types.Info + Instances *PackageInstanceSets +} + +// Scan package files for generic instances. +func (c *Collector) Scan(pkg *types.Package, files ...*ast.File) { + if c.Info.Instances == nil || c.Info.Defs == nil { + panic(fmt.Errorf("types.Info must have Instances and Defs populated")) + } + objMap := map[types.Object]ast.Node{} + + // Collect instances of generic objects in non-generic code in the package and + // add then to the existing InstanceSet. + sc := seedVisitor{ + visitor: visitor{ + instances: c.Instances, + resolver: nil, + info: c.Info, + }, + objMap: objMap, + } + for _, file := range files { + ast.Walk(&sc, file) + } + + for iset := c.Instances.Pkg(pkg); !iset.exhausted(); { + inst, _ := iset.next() + + switch typ := inst.Object.Type().(type) { + case *types.Signature: + c.scanSignature(inst, typ, objMap) + + case *types.Named: + c.scanNamed(inst, typ, objMap) + } + } +} + +func (c *Collector) scanSignature(inst Instance, typ *types.Signature, objMap map[types.Object]ast.Node) { + tParams := SignatureTypeParams(typ) + v := visitor{ + instances: c.Instances, + resolver: NewResolver(c.TContext, tParams, inst.TArgs, nil), + info: c.Info, + tNest: inst.TArgs, + } + ast.Walk(&v, objMap[inst.Object]) +} + +func (c *Collector) scanNamed(inst Instance, typ *types.Named, objMap map[types.Object]ast.Node) { + obj := typ.Obj() + node := objMap[obj] + if node == nil { + // Types without an entry in objMap are concrete types + // that are defined in a generic context. Skip them. + return + } + + var nestResolver *Resolver + if len(inst.TNest) > 0 { + fn := FindNestingFunc(inst.Object) + tp := SignatureTypeParams(fn.Type().(*types.Signature)) + nestResolver = NewResolver(c.TContext, tp, inst.TNest, nil) + } + + v := visitor{ + instances: c.Instances, + resolver: NewResolver(c.TContext, typ.TypeParams(), inst.TArgs, nestResolver), + info: c.Info, + tNest: inst.TNest, + } + ast.Walk(&v, node) +} diff --git a/compiler/internal/typeparams/collect_test.go b/compiler/internal/typeparams/collect_test.go new file mode 100644 index 000000000..6864e5ead --- /dev/null +++ b/compiler/internal/typeparams/collect_test.go @@ -0,0 +1,879 @@ +package typeparams + +import ( + "go/ast" + "go/token" + "go/types" + "strings" + "testing" + + "github.com/google/go-cmp/cmp" + "github.com/gopherjs/gopherjs/internal/srctesting" + "golang.org/x/tools/go/ast/astutil" +) + +func TestVisitor(t *testing.T) { + // This test verifies that instance collector is able to discover + // instantiations of generic types and functions in all possible contexts. + const src = `package testcase + + type A struct{} + type B struct{} + type C struct{} + type D struct{} + type E struct{} + type F struct{} + type G struct{} + + type typ[T any, V any] []T + func (t *typ[T, V]) method(x T) {} + func fun[U any, W any](x U, y W) {} + + func entry1(arg typ[int8, A]) (result typ[int16, A]) { + fun(1, A{}) + fun[int8, A](1, A{}) + println(fun[int16, A]) + + t := typ[int, A]{} + t.method(0) + (*typ[int32, A]).method(nil, 0) + + type x struct{ T []typ[int64, A] } + type y[X any] struct{ T []typ[A, X] } + _ = y[int8]{} + _ = y[A]{} + + return + } + + func entry2[T any](arg typ[int8, T]) (result typ[int16, T]) { + var zeroT T + fun(1, zeroT) + fun[int8, T](1, zeroT) + println(fun[int16, T]) + + t := typ[int, T]{} + t.method(0) + (*typ[int32, T]).method(nil, 0) + + type x struct{ T []typ[int64, T] } + type y[X any] struct{ T []typ[T, X] } + _ = y[int8]{} + _ = y[T]{} + + return + } + + type entry3[T any] struct{ + typ[int, T] + field1 struct { field2 typ[int8, T] } + } + func (e entry3[T]) method(arg typ[int8, T]) (result typ[int16, T]) { + var zeroT T + fun(1, zeroT) + fun[int8, T](1, zeroT) + println(fun[int16, T]) + + t := typ[int, T]{} + t.method(0) + (*typ[int32, T]).method(nil, 0) + + type x struct{ T []typ[int64, T] } + type y[X any] struct{ T []typ[T, X] } + _ = y[int8]{} + _ = y[T]{} + + return + } + + type entry4 struct{ + typ[int, E] + field1 struct { field2 typ[int8, E] } + } + + type entry5 = typ[int, F] + ` + f := srctesting.New(t) + file := f.Parse("test.go", src) + info, pkg := f.Check("pkg/test", file) + + lookupObj := func(name string) types.Object { + return srctesting.LookupObj(pkg, name) + } + lookupType := func(name string) types.Type { return lookupObj(name).Type() } + lookupDecl := func(name string) ast.Node { + obj := lookupObj(name) + path, _ := astutil.PathEnclosingInterval(file, obj.Pos(), obj.Pos()) + for _, n := range path { + switch n.(type) { + case *ast.FuncDecl, *ast.TypeSpec: + return n + } + } + t.Fatalf("Could not find AST node representing %v", obj) + return nil + } + + // Generates a list of instances we expect to discover from functions and + // methods. Sentinel type is a type parameter we use uniquely within one + // context, which allows us to make sure that collection is not being tested + // against a wrong part of AST. + instancesInFunc := func(sentinel types.Type) []Instance { + return []Instance{ + { + // Called with type arguments inferred. + Object: lookupObj("fun"), + TArgs: []types.Type{types.Typ[types.Int], sentinel}, + }, { + // Called with type arguments explicitly specified. + Object: lookupObj("fun"), + TArgs: []types.Type{types.Typ[types.Int8], sentinel}, + }, { + // Passed as an argument. + Object: lookupObj("fun"), + TArgs: []types.Type{types.Typ[types.Int16], sentinel}, + }, { + // Literal expression. + Object: lookupObj("typ"), + TArgs: []types.Type{types.Typ[types.Int], sentinel}, + }, { + Object: lookupObj("typ.method"), + TArgs: []types.Type{types.Typ[types.Int], sentinel}, + }, { + // Function argument. + Object: lookupObj("typ"), + TArgs: []types.Type{types.Typ[types.Int8], sentinel}, + }, { + Object: lookupObj("typ.method"), + TArgs: []types.Type{types.Typ[types.Int8], sentinel}, + }, { + // Function return type. + Object: lookupObj("typ"), + TArgs: []types.Type{types.Typ[types.Int16], sentinel}, + }, { + Object: lookupObj("typ.method"), + TArgs: []types.Type{types.Typ[types.Int16], sentinel}, + }, { + // Method expression. + Object: lookupObj("typ"), + TArgs: []types.Type{types.Typ[types.Int32], sentinel}, + }, { + Object: lookupObj("typ.method"), + TArgs: []types.Type{types.Typ[types.Int32], sentinel}, + }, { + // Type decl statement. + Object: lookupObj("typ"), + TArgs: []types.Type{types.Typ[types.Int64], sentinel}, + }, { + Object: lookupObj("typ.method"), + TArgs: []types.Type{types.Typ[types.Int64], sentinel}, + }, + } + } + + // Generates a list of instances we expect to discover from type declarations. + // Sentinel type is a type parameter we use uniquely within one context, which + // allows us to make sure that collection is not being tested against a wrong + // part of AST. + instancesInType := func(sentinel types.Type) []Instance { + return []Instance{ + { + Object: lookupObj("typ"), + TArgs: []types.Type{types.Typ[types.Int], sentinel}, + }, { + Object: lookupObj("typ.method"), + TArgs: []types.Type{types.Typ[types.Int], sentinel}, + }, { + Object: lookupObj("typ"), + TArgs: []types.Type{types.Typ[types.Int8], sentinel}, + }, { + Object: lookupObj("typ.method"), + TArgs: []types.Type{types.Typ[types.Int8], sentinel}, + }, + } + } + + tests := []struct { + descr string + resolver *Resolver + node ast.Node + want []Instance + }{ + { + descr: "non-generic function", + resolver: nil, + node: lookupDecl("entry1"), + want: append( + instancesInFunc(lookupType("A")), + Instance{ + Object: lookupObj("entry1.y"), + TArgs: []types.Type{types.Typ[types.Int8]}, + }, + Instance{ + Object: lookupObj("entry1.y"), + TArgs: []types.Type{lookupType("A")}, + }, + ), + }, { + descr: "generic function", + resolver: NewResolver( + types.NewContext(), + lookupType("entry2").(*types.Signature).TypeParams(), + []types.Type{lookupType("B")}, + nil, + ), + node: lookupDecl("entry2"), + want: append( + instancesInFunc(lookupType("B")), + Instance{ + Object: lookupObj("entry2.x"), + TNest: []types.Type{lookupType("B")}, + }, + Instance{ + Object: lookupObj("entry1.y"), + TNest: []types.Type{lookupType("B")}, + TArgs: []types.Type{types.Typ[types.Int8]}, + }, + Instance{ + Object: lookupObj("entry2.y"), + TNest: []types.Type{lookupType("B")}, + TArgs: []types.Type{lookupType("B")}, + }, + ), + }, { + descr: "generic method", + resolver: NewResolver( + types.NewContext(), + lookupType("entry3.method").(*types.Signature).RecvTypeParams(), + []types.Type{lookupType("C")}, + nil, + ), + node: lookupDecl("entry3.method"), + want: append( + instancesInFunc(lookupType("C")), + Instance{ + Object: lookupObj("entry3"), + TArgs: []types.Type{lookupType("C")}, + }, + Instance{ + Object: lookupObj("entry3.method"), + TArgs: []types.Type{lookupType("C")}, + }, + Instance{ + Object: lookupObj("entry3.method.x"), + TNest: []types.Type{lookupType("C")}, + }, + Instance{ + Object: lookupObj("entry3.method.y"), + TNest: []types.Type{lookupType("C")}, + TArgs: []types.Type{types.Typ[types.Int8]}, + }, + Instance{ + Object: lookupObj("entry3.method.y"), + TNest: []types.Type{lookupType("C")}, + TArgs: []types.Type{lookupType("C")}, + }, + ), + }, { + descr: "generic type declaration", + resolver: NewResolver( + types.NewContext(), + lookupType("entry3").(*types.Named).TypeParams(), + []types.Type{lookupType("D")}, + nil, + ), + node: lookupDecl("entry3"), + want: instancesInType(lookupType("D")), + }, { + descr: "non-generic type declaration", + resolver: nil, + node: lookupDecl("entry4"), + want: instancesInType(lookupType("E")), + }, { + descr: "non-generic type alias", + resolver: nil, + node: lookupDecl("entry5"), + want: []Instance{ + { + Object: lookupObj("typ"), + TArgs: []types.Type{types.Typ[types.Int], lookupType("F")}, + }, + { + Object: lookupObj("typ.method"), + TArgs: []types.Type{types.Typ[types.Int], lookupType("F")}, + }, + }, + }, + } + + for _, test := range tests { + t.Run(test.descr, func(t *testing.T) { + v := visitor{ + instances: &PackageInstanceSets{}, + resolver: test.resolver, + info: info, + } + if test.resolver != nil { + // Since we know all the tests are for functions and methods, + // set the nested type to the type parameter from the resolver. + v.tNest = test.resolver.tArgs + } + ast.Walk(&v, test.node) + got := v.instances.Pkg(pkg).Values() + if diff := cmp.Diff(test.want, got, instanceOpts()); diff != "" { + t.Errorf("Discovered instance diff (-want,+got):\n%s", diff) + } + }) + } +} + +func TestSeedVisitor(t *testing.T) { + src := `package test + type typ[T any] int + func (t typ[T]) method(arg T) { var x typ[string]; _ = x } + func fun[T any](arg T) { var y typ[string]; _ = y } + + const a typ[int] = 1 + var b typ[int] + type c struct { field typ[int8] } + func (_ c) method() { var _ typ[int16] } + type d = typ[int32] + func e() { var _ typ[int64] } + ` + + f := srctesting.New(t) + file := f.Parse("test.go", src) + info, pkg := f.Check("pkg/test", file) + + sv := seedVisitor{ + visitor: visitor{ + instances: &PackageInstanceSets{}, + resolver: nil, + info: info, + }, + objMap: map[types.Object]ast.Node{}, + } + ast.Walk(&sv, file) + + tInst := func(tArg types.Type) Instance { + return Instance{ + Object: pkg.Scope().Lookup("typ"), + TArgs: []types.Type{tArg}, + } + } + mInst := func(tArg types.Type) Instance { + return Instance{ + Object: srctesting.LookupObj(pkg, "typ.method"), + TArgs: []types.Type{tArg}, + } + } + want := []Instance{ + tInst(types.Typ[types.Int]), + mInst(types.Typ[types.Int]), + tInst(types.Typ[types.Int8]), + mInst(types.Typ[types.Int8]), + tInst(types.Typ[types.Int16]), + mInst(types.Typ[types.Int16]), + tInst(types.Typ[types.Int32]), + mInst(types.Typ[types.Int32]), + tInst(types.Typ[types.Int64]), + mInst(types.Typ[types.Int64]), + } + got := sv.instances.Pkg(pkg).Values() + if diff := cmp.Diff(want, got, instanceOpts()); diff != "" { + t.Errorf("Instances from seedVisitor contain diff (-want,+got):\n%s", diff) + } +} + +func TestCollector(t *testing.T) { + src := `package test + type typ[T any] int + func (t typ[T]) method(arg T) { var _ typ[int]; fun[int8](0) } + func fun[T any](arg T) { + var _ typ[int16] + + type nested[U any] struct{} + _ = nested[T]{} + } + + type ignore = int + + func a() { + var _ typ[int32] + fun[int64](0) + } + ` + + f := srctesting.New(t) + file := f.Parse("test.go", src) + info, pkg := f.Check("pkg/test", file) + + c := Collector{ + TContext: types.NewContext(), + Info: info, + Instances: &PackageInstanceSets{}, + } + c.Scan(pkg, file) + + inst := func(name, tNest, tArg string) Instance { + return Instance{ + Object: srctesting.LookupObj(pkg, name), + TNest: evalTypeArgs(t, f.FileSet, pkg, tNest), + TArgs: evalTypeArgs(t, f.FileSet, pkg, tArg), + } + } + want := []Instance{ + inst(`typ`, ``, `int`), + inst(`typ.method`, ``, `int`), + inst(`fun`, ``, `int8`), + inst(`fun.nested`, `int8`, `int8`), + inst(`typ`, ``, `int16`), + inst(`typ.method`, ``, `int16`), + inst(`typ`, ``, `int32`), + inst(`typ.method`, ``, `int32`), + inst(`fun`, ``, `int64`), + inst(`fun.nested`, `int64`, `int64`), + } + got := c.Instances.Pkg(pkg).Values() + if diff := cmp.Diff(want, got, instanceOpts()); diff != "" { + t.Errorf("Instances from Collector contain diff (-want,+got):\n%s", diff) + } +} + +func TestCollector_MoreNesting(t *testing.T) { + src := `package test + + func fun[T any]() { + type nestedCon struct{ X T } + _ = nestedCon{} + + type nestedGen[U any] struct{ Y T; Z U } + _ = nestedGen[T]{} + _ = nestedGen[int8]{} + + type nestedCover[T any] struct{ W T } + _ = nestedCover[T]{} + _ = nestedCover[int16]{} + } + + func a() { + fun[int32]() + fun[int64]() + } + ` + + f := srctesting.New(t) + file := f.Parse(`test.go`, src) + info, pkg := f.Check(`pkg/test`, file) + + c := Collector{ + TContext: types.NewContext(), + Info: info, + Instances: &PackageInstanceSets{}, + } + c.Scan(pkg, file) + + inst := func(name, tNest, tArg string) Instance { + return Instance{ + Object: srctesting.LookupObj(pkg, name), + TNest: evalTypeArgs(t, f.FileSet, pkg, tNest), + TArgs: evalTypeArgs(t, f.FileSet, pkg, tArg), + } + } + want := []Instance{ + inst(`fun`, ``, `int32`), + inst(`fun`, ``, `int64`), + + inst(`fun.nestedCon`, `int32`, ``), + inst(`fun.nestedCon`, `int64`, ``), + + inst(`fun.nestedGen`, `int32`, `int32`), + inst(`fun.nestedGen`, `int32`, `int8`), + inst(`fun.nestedGen`, `int64`, `int64`), + inst(`fun.nestedGen`, `int64`, `int8`), + + inst(`fun.nestedCover`, `int32`, `int32`), + inst(`fun.nestedCover`, `int32`, `int16`), + inst(`fun.nestedCover`, `int64`, `int64`), + inst(`fun.nestedCover`, `int64`, `int16`), + } + got := c.Instances.Pkg(pkg).Values() + if diff := cmp.Diff(want, got, instanceOpts()); diff != `` { + t.Errorf("Instances from Collector contain diff (-want,+got):\n%s", diff) + } +} + +func TestCollector_NestingWithVars(t *testing.T) { + // This is loosely based off of go1.19.13/test/typeparam/issue47740b.go + // I was getting an error where `Q.print[int;]` was showing up when + // `Q.print` is not in a nesting context with `int` and this helped debug + // it. The problem was that `q` was being treated like a type not a var. + src := `package test + + type Q struct{ v any } + func (q Q) print() { + println(q.v) + } + + func newQ(v any) Q { + return Q{v} + } + + type S[T any] struct{ x T } + func (s S[T]) echo() { + q := newQ(s.x) + q.print() + } + + func a() { + s := S[int]{x: 0} + s.echo() + } + ` + + f := srctesting.New(t) + file := f.Parse(`test.go`, src) + info, pkg := f.Check(`pkg/test`, file) + + c := Collector{ + TContext: types.NewContext(), + Info: info, + Instances: &PackageInstanceSets{}, + } + c.Scan(pkg, file) + + inst := func(name, tNest, tArg string) Instance { + return Instance{ + Object: srctesting.LookupObj(pkg, name), + TNest: evalTypeArgs(t, f.FileSet, pkg, tNest), + TArgs: evalTypeArgs(t, f.FileSet, pkg, tArg), + } + } + want := []Instance{ + inst(`S`, ``, `int`), + inst(`S.echo`, ``, `int`), + } + got := c.Instances.Pkg(pkg).Values() + if diff := cmp.Diff(want, got, instanceOpts()); diff != `` { + t.Errorf("Instances from Collector contain diff (-want,+got):\n%s", diff) + } +} + +func TestCollector_RecursiveTypeParams(t *testing.T) { + // This is based off of part of go1.19.13/test/typeparam/nested.go + src := `package test + func F[A any]() {} + func main() { + type U[_ any] int + type X[A any] U[X[A]] + F[X[int]]() + } + ` + + f := srctesting.New(t) + file := f.Parse(`test.go`, src) + info, pkg := f.Check(`test`, file) + + c := Collector{ + TContext: types.NewContext(), + Info: info, + Instances: &PackageInstanceSets{}, + } + c.Scan(pkg, file) + + tInt := types.Typ[types.Int] + xAny := srctesting.LookupObj(pkg, `main.X`) + xInt, err := types.Instantiate(types.NewContext(), xAny.Type(), []types.Type{tInt}, true) + if err != nil { + t.Fatalf("Failed to instantiate X[int]: %v", err) + } + + want := []Instance{ + { + Object: srctesting.LookupObj(pkg, `F`), + TArgs: []types.Type{xInt}, + }, { + Object: srctesting.LookupObj(pkg, `main.U`), + TArgs: []types.Type{xInt}, + }, { + Object: xAny, + TArgs: []types.Type{tInt}, + }, + } + got := c.Instances.Pkg(pkg).Values() + if diff := cmp.Diff(want, got, instanceOpts()); diff != `` { + t.Errorf("Instances from Collector contain diff (-want,+got):\n%s", diff) + } +} + +func TestCollector_NestedRecursiveTypeParams(t *testing.T) { + t.Skip(`Skipping test due to known issue with nested recursive type parameters.`) + // TODO(grantnelson-wf): This test is failing because the type parameters + // inside of U are not being resolved to concrete types. This is because + // when instantiating X in the collector, we are not resolving the + // nested type of U that is X's type argument. This leave the A in U + // as a type parameter instead of resolving it to string. + + // This is based off of part of go1.19.13/test/typeparam/nested.go + src := `package test + func F[A any]() any { + type U[_ any] struct{ x A } + type X[B any] U[X[B]] + return X[int]{} + } + func main() { + print(F[string]()) + } + ` + + f := srctesting.New(t) + file := f.Parse(`test.go`, src) + info, pkg := f.Check(`test`, file) + + c := Collector{ + TContext: types.NewContext(), + Info: info, + Instances: &PackageInstanceSets{}, + } + c.Scan(pkg, file) + + xAny := srctesting.LookupObj(pkg, `F.X`) + xInt, err := types.Instantiate(types.NewContext(), xAny.Type(), []types.Type{types.Typ[types.Int]}, true) + if err != nil { + t.Fatalf("Failed to instantiate X[int]: %v", err) + } + // TODO(grantnelson-wf): Need to instantiate xInt to replace `A` with `int` in the struct. + if isGeneric(xInt) { + t.Errorf("Expected uInt to be non-generic, got %v", xInt.Underlying()) + } + + want := []Instance{ + { + Object: srctesting.LookupObj(pkg, `F`), + TArgs: []types.Type{types.Typ[types.String]}, + }, { + Object: srctesting.LookupObj(pkg, `F.U`), + TNest: []types.Type{types.Typ[types.String]}, + TArgs: []types.Type{xInt}, + }, { + Object: xAny, + TNest: []types.Type{types.Typ[types.String]}, + TArgs: []types.Type{types.Typ[types.Int]}, + }, + } + got := c.Instances.Pkg(pkg).Values() + if diff := cmp.Diff(want, got, instanceOpts()); diff != `` { + t.Errorf("Instances from Collector contain diff (-want,+got):\n%s", diff) + } +} + +func TestCollector_NestedTypeParams(t *testing.T) { + t.Skip(`Skipping test due to known issue with nested recursive type parameters.`) + // TODO(grantnelson-wf): This test is failing because the type parameters + // inside of U are not being resolved to concrete types. This is because + // when instantiating X in the collector, we are not resolving the + // nested type of U that is X's type argument. This leave the A in U + // as a type parameter instead of resolving it to string. + + // This is based off of part of go1.19.13/test/typeparam/nested.go + src := `package test + func F[A any]() any { + type T[B any] struct{} + type U[_ any] struct{ X A } + return T[U[A]]{} + } + func main() { + print(F[int]()) + } + ` + + f := srctesting.New(t) + file := f.Parse(`test.go`, src) + info, pkg := f.Check(`test`, file) + + c := Collector{ + TContext: types.NewContext(), + Info: info, + Instances: &PackageInstanceSets{}, + } + c.Scan(pkg, file) + + uAny := srctesting.LookupObj(pkg, `F.U`) + uInt, err := types.Instantiate(types.NewContext(), uAny.Type(), []types.Type{types.Typ[types.Int]}, true) + if err != nil { + t.Fatalf("Failed to instantiate U[int]: %v", err) + } + //TODO(grantnelson-wf): Need to instantiate uInt to replace `A` with `int` in the struct. + if isGeneric(uInt) { + t.Errorf("Expected uInt to be non-generic, got %v", uInt.Underlying()) + } + + want := []Instance{ + { + Object: srctesting.LookupObj(pkg, `F`), + TArgs: []types.Type{types.Typ[types.Int]}, + }, { + Object: srctesting.LookupObj(pkg, `F.U`), + TNest: []types.Type{types.Typ[types.Int]}, + TArgs: []types.Type{types.Typ[types.Int]}, + }, { + Object: srctesting.LookupObj(pkg, `F.T`), + TNest: []types.Type{types.Typ[types.Int]}, + TArgs: []types.Type{uInt}, + }, + } + got := c.Instances.Pkg(pkg).Values() + if diff := cmp.Diff(want, got, instanceOpts()); diff != `` { + t.Errorf("Instances from Collector contain diff (-want,+got):\n%s", diff) + } +} + +func evalTypeArgs(t *testing.T, fSet *token.FileSet, pkg *types.Package, expr string) []types.Type { + if len(expr) == 0 { + return nil + } + args := strings.Split(expr, ",") + targs := make([]types.Type, 0, len(args)) + for _, astr := range args { + tv, err := types.Eval(fSet, pkg, 0, astr) + if err != nil { + t.Fatalf("Eval(%s) failed: %v", astr, err) + } + targs = append(targs, tv.Type) + } + return targs +} + +func TestCollector_CrossPackage(t *testing.T) { + f := srctesting.New(t) + const src = `package foo + type X[T any] struct {Value T} + + func F[G any](g G) { + x := X[G]{} + println(x) + } + + func DoFoo() { + F(int8(8)) + } + ` + fooFile := f.Parse("foo.go", src) + _, fooPkg := f.Check("pkg/foo", fooFile) + + const src2 = `package bar + import "pkg/foo" + func FProxy[T any](t T) { + foo.F[T](t) + } + func DoBar() { + FProxy(int16(16)) + } + ` + barFile := f.Parse("bar.go", src2) + _, barPkg := f.Check("pkg/bar", barFile) + + c := Collector{ + TContext: types.NewContext(), + Info: f.Info, + Instances: &PackageInstanceSets{}, + } + c.Scan(barPkg, barFile) + c.Scan(fooPkg, fooFile) + + inst := func(pkg *types.Package, name string, tArg types.BasicKind) Instance { + return Instance{ + Object: srctesting.LookupObj(pkg, name), + TArgs: []types.Type{types.Typ[tArg]}, + } + } + + wantFooInstances := []Instance{ + inst(fooPkg, "F", types.Int16), // Found in "pkg/foo". + inst(fooPkg, "F", types.Int8), + inst(fooPkg, "X", types.Int16), // Found due to F[int16] found in "pkg/foo". + inst(fooPkg, "X", types.Int8), + } + gotFooInstances := c.Instances.Pkg(fooPkg).Values() + if diff := cmp.Diff(wantFooInstances, gotFooInstances, instanceOpts()); diff != "" { + t.Errorf("Instances from pkg/foo contain diff (-want,+got):\n%s", diff) + } + + wantBarInstances := []Instance{ + inst(barPkg, "FProxy", types.Int16), + } + gotBarInstances := c.Instances.Pkg(barPkg).Values() + if diff := cmp.Diff(wantBarInstances, gotBarInstances, instanceOpts()); diff != "" { + t.Errorf("Instances from pkg/foo contain diff (-want,+got):\n%s", diff) + } +} + +func TestResolver_SubstituteSelection(t *testing.T) { + tests := []struct { + descr string + src string + wantObj string + wantSig string + }{{ + descr: "type parameter method", + src: `package test + type stringer interface{ String() string } + + type x struct{} + func (_ x) String() string { return "" } + + type g[T stringer] struct{} + func (_ g[T]) Method(t T) string { + return t.String() + }`, + wantObj: "func (pkg/test.x).String() string", + wantSig: "func() string", + }, { + descr: "generic receiver type with type parameter", + src: `package test + type x struct{} + + type g[T any] struct{} + func (_ g[T]) Method(t T) string { + return g[T]{}.Method(t) + }`, + wantObj: "func (pkg/test.g[pkg/test.x]).Method(t pkg/test.x) string", + wantSig: "func(t pkg/test.x) string", + }, { + descr: "method expression", + src: `package test + type x struct{} + + type g[T any] struct{} + func (recv g[T]) Method(t T) string { + return g[T].Method(recv, t) + }`, + wantObj: "func (pkg/test.g[pkg/test.x]).Method(t pkg/test.x) string", + wantSig: "func(recv pkg/test.g[pkg/test.x], t pkg/test.x) string", + }} + + for _, test := range tests { + t.Run(test.descr, func(t *testing.T) { + f := srctesting.New(t) + file := f.Parse("test.go", test.src) + info, pkg := f.Check("pkg/test", file) + + method := srctesting.LookupObj(pkg, "g.Method").(*types.Func).Type().(*types.Signature) + resolver := NewResolver(nil, method.RecvTypeParams(), []types.Type{srctesting.LookupObj(pkg, "x").Type()}, nil) + + if l := len(info.Selections); l != 1 { + t.Fatalf("Got: %d selections. Want: 1", l) + } + for _, sel := range info.Selections { + gotObj := types.ObjectString(resolver.SubstituteSelection(sel).Obj(), nil) + if gotObj != test.wantObj { + t.Fatalf("Got: resolver.SubstituteSelection().Obj() = %q. Want: %q.", gotObj, test.wantObj) + } + gotSig := types.TypeString(resolver.SubstituteSelection(sel).Type(), nil) + if gotSig != test.wantSig { + t.Fatalf("Got: resolver.SubstituteSelection().Type() = %q. Want: %q.", gotSig, test.wantSig) + } + } + }) + } +} diff --git a/compiler/internal/typeparams/instance.go b/compiler/internal/typeparams/instance.go new file mode 100644 index 000000000..64c67b4b5 --- /dev/null +++ b/compiler/internal/typeparams/instance.go @@ -0,0 +1,245 @@ +package typeparams + +import ( + "fmt" + "go/types" + "strings" + + "github.com/gopherjs/gopherjs/compiler/internal/symbol" + "github.com/gopherjs/gopherjs/compiler/typesutil" +) + +// Instance of a generic type or function. +// +// Non-generic objects can be represented as an Instance with zero type params, +// they are instances of themselves. +type Instance struct { + Object types.Object // Object to be instantiated. + TArgs typesutil.TypeList // Type params to instantiate with. + + // TNest is the type params of the function this object was nested with-in. + // e.g. In `func A[X any]() { type B[Y any] struct {} }` the `X` + // from `A` is the context of `B[Y]` thus creating `B[X;Y]`. + TNest typesutil.TypeList +} + +// String returns a string representation of the Instance. +// +// Two semantically different instances may have the same string representation +// if the instantiated object or its type arguments shadow other types. +func (i Instance) String() string { + return i.symbolicName() + i.TypeParamsString(`<`, `>`) +} + +// TypeString returns a Go type string representing the instance (suitable for %T verb). +func (i Instance) TypeString() string { + return i.qualifiedName() + i.TypeParamsString(`[`, `]`) +} + +// symbolicName returns a string representation of the instance's name +// including the package name and pointer indicators but +// excluding the type parameters. +func (i Instance) symbolicName() string { + if i.Object == nil { + return `` + } + return symbol.New(i.Object).String() +} + +// qualifiedName returns a string representation of the instance's name +// including the package name but +// excluding the type parameters and pointer indicators. +func (i Instance) qualifiedName() string { + if i.Object == nil { + return `` + } + if i.Object.Pkg() == nil { + return i.Object.Name() + } + return fmt.Sprintf("%s.%s", i.Object.Pkg().Name(), i.Object.Name()) +} + +// TypeParamsString returns part of a Go type string that represents the type +// parameters of the instance including the nesting type parameters, e.g. [X;Y,Z]. +func (i Instance) TypeParamsString(open, close string) string { + hasNest := len(i.TNest) > 0 + hasArgs := len(i.TArgs) > 0 + buf := strings.Builder{} + if hasNest || hasArgs { + buf.WriteString(open) + if hasNest { + buf.WriteString(i.TNest.String()) + buf.WriteRune(';') + if hasArgs { + buf.WriteRune(' ') + } + } + if hasArgs { + buf.WriteString(i.TArgs.String()) + } + buf.WriteString(close) + } + return buf.String() +} + +// IsTrivial returns true if this is an instance of a non-generic object +// and it is not nested in a generic function. +func (i Instance) IsTrivial() bool { + return len(i.TArgs) == 0 && len(i.TNest) == 0 +} + +// Recv returns an instance of the receiver type of a method. +// +// Returns zero value if not a method. +func (i Instance) Recv() Instance { + sig, ok := i.Object.Type().(*types.Signature) + if !ok { + return Instance{} + } + recv := typesutil.RecvType(sig) + if recv == nil { + return Instance{} + } + return Instance{ + Object: recv.Obj(), + TArgs: i.TArgs, + } +} + +// InstanceSet allows collecting and processing unique Instances. +// +// Each Instance may be added to the set any number of times, but it will be +// returned for processing exactly once. Processing order is not specified. +type InstanceSet struct { + values []Instance + unprocessed int // Index in values for the next unprocessed element. + seen InstanceMap[int] // Maps instance to a unique numeric id. +} + +// Add instances to the set. Instances that have been previously added to the +// set won't be requeued for processing regardless of whether they have been +// processed already. +func (iset *InstanceSet) Add(instances ...Instance) *InstanceSet { + for _, inst := range instances { + if iset.seen.Has(inst) { + continue + } + iset.seen.Set(inst, iset.seen.Len()) + iset.values = append(iset.values, inst) + } + return iset +} + +// ID returns a unique numeric identifier assigned to an instance in the set. +// The ID is guaranteed to be unique among all instances of the same object +// within a given program. The ID will be consistent, as long as instances are +// added to the set in the same order. +// +// In order to have an ID assigned, the instance must have been previously added +// to the set. +// +// Note: these ids are used in the generated code as keys to the specific +// type/function instantiation in the type/function object. Using this has two +// advantages: +// +// - More compact generated code compared to string keys derived from type args. +// +// - Collision avoidance in case of two different types having the same name due +// to shadowing. +// +// Here's an example where it's very difficult to assign non-colliding +// name-based keys to the two different types T: +// +// func foo() { +// type T int +// { type T string } // Code block creates a new nested scope allowing for shadowing. +// } +func (iset *InstanceSet) ID(inst Instance) int { + id, ok := iset.seen.get(inst) + if !ok { + panic(fmt.Errorf("requesting ID of instance %v that hasn't been added to the set", inst)) + } + return id +} + +// next returns the next Instance to be processed. +// +// If there are no unprocessed instances, the second returned value will be false. +func (iset *InstanceSet) next() (Instance, bool) { + if iset.exhausted() { + return Instance{}, false + } + next := iset.values[iset.unprocessed] + iset.unprocessed++ + return next, true +} + +// exhausted returns true if there are no unprocessed instances in the set. +func (iset *InstanceSet) exhausted() bool { return len(iset.values) <= iset.unprocessed } + +// Values returns instances that are currently in the set. Order is not specified. +func (iset *InstanceSet) Values() []Instance { + return iset.values +} + +// ByObj returns instances grouped by object they belong to. Order is not specified. +func (iset *InstanceSet) ByObj() map[types.Object][]Instance { + result := map[types.Object][]Instance{} + for _, inst := range iset.values { + result[inst.Object] = append(result[inst.Object], inst) + } + return result +} + +// ForObj returns the instances that belong to the given object type. +// Order is not specified. This returns the same values as `ByObj()[obj]`. +func (iset *InstanceSet) ForObj(obj types.Object) []Instance { + result := []Instance{} + for _, inst := range iset.values { + if inst.Object == obj { + result = append(result, inst) + } + } + return result +} + +// ObjHasInstances returns true if there are any instances (either trivial +// or non-trivial) that belong to the given object type, otherwise false. +func (iset *InstanceSet) ObjHasInstances(obj types.Object) bool { + for _, inst := range iset.values { + if inst.Object == obj { + return true + } + } + return false +} + +// PackageInstanceSets stores an InstanceSet for each package in a program, keyed +// by import path. +type PackageInstanceSets map[string]*InstanceSet + +// Pkg returns InstanceSet for objects defined in the given package. +func (i PackageInstanceSets) Pkg(pkg *types.Package) *InstanceSet { + path := pkg.Path() + iset, ok := i[path] + if !ok { + iset = &InstanceSet{} + i[path] = iset + } + return iset +} + +// Add instances to the appropriate package's set. Automatically initialized +// new per-package sets upon a first encounter. +func (i PackageInstanceSets) Add(instances ...Instance) { + for _, inst := range instances { + i.Pkg(inst.Object.Pkg()).Add(inst) + } +} + +// ID returns a unique numeric identifier assigned to an instance in the set. +// +// See: InstanceSet.ID(). +func (i PackageInstanceSets) ID(inst Instance) int { + return i.Pkg(inst.Object.Pkg()).ID(inst) +} diff --git a/compiler/internal/typeparams/instance_test.go b/compiler/internal/typeparams/instance_test.go new file mode 100644 index 000000000..9b88c87b5 --- /dev/null +++ b/compiler/internal/typeparams/instance_test.go @@ -0,0 +1,275 @@ +package typeparams + +import ( + "go/types" + "testing" + + "github.com/google/go-cmp/cmp" + "github.com/google/go-cmp/cmp/cmpopts" + "github.com/gopherjs/gopherjs/internal/srctesting" + "github.com/gopherjs/gopherjs/internal/testingx" +) + +func instanceOpts() cmp.Options { + return cmp.Options{ + // Instances are represented by their IDs for diffing purposes. + cmp.Transformer("Instance", func(i Instance) string { + return i.String() + }), + // Order of instances in a slice doesn't matter, sort them by ID. + cmpopts.SortSlices(func(a, b Instance) bool { + return a.String() < b.String() + }), + } +} + +func TestInstanceString(t *testing.T) { + const src = `package testcase + + type Ints []int + + type Typ[T any, V any] []T + func (t Typ[T, V]) Method(x T) {} + + type typ[T any, V any] []T + func (t typ[T, V]) method(x T) {} + + func Fun[U any, W any](x, y U) {} + func fun[U any, W any](x, y U) {} + ` + f := srctesting.New(t) + _, pkg := f.Check("pkg/test", f.Parse("test.go", src)) + mustType := testingx.Must[types.Type](t) + + tests := []struct { + descr string + instance Instance + wantStr string + wantTypeString string + }{{ + descr: "exported type", + instance: Instance{ + Object: pkg.Scope().Lookup("Typ"), + TArgs: []types.Type{types.Typ[types.Int], types.Typ[types.String]}, + }, + wantStr: "pkg/test.Typ", + wantTypeString: "testcase.Typ[int, string]", + }, { + descr: "exported method", + instance: Instance{ + Object: pkg.Scope().Lookup("Typ").Type().(*types.Named).Method(0), + TArgs: []types.Type{types.Typ[types.Int], types.Typ[types.String]}, + }, + wantStr: "pkg/test.Typ.Method", + }, { + descr: "exported function", + instance: Instance{ + Object: pkg.Scope().Lookup("Fun"), + TArgs: []types.Type{types.Typ[types.Int], types.Typ[types.String]}, + }, + wantStr: "pkg/test.Fun", + }, { + descr: "unexported type", + instance: Instance{ + Object: pkg.Scope().Lookup("typ"), + TArgs: []types.Type{types.Typ[types.Int], types.Typ[types.String]}, + }, + wantStr: "pkg/test.typ", + wantTypeString: "testcase.typ[int, string]", + }, { + descr: "unexported method", + instance: Instance{ + Object: pkg.Scope().Lookup("typ").Type().(*types.Named).Method(0), + TArgs: []types.Type{types.Typ[types.Int], types.Typ[types.String]}, + }, + wantStr: "pkg/test.typ.method", + }, { + descr: "unexported function", + instance: Instance{ + Object: pkg.Scope().Lookup("fun"), + TArgs: []types.Type{types.Typ[types.Int], types.Typ[types.String]}, + }, + wantStr: "pkg/test.fun", + }, { + descr: "no type params", + instance: Instance{ + Object: pkg.Scope().Lookup("Ints"), + }, + wantStr: "pkg/test.Ints", + wantTypeString: "testcase.Ints", + }, { + descr: "complex parameter type", + instance: Instance{ + Object: pkg.Scope().Lookup("fun"), + TArgs: []types.Type{ + types.NewSlice(types.Typ[types.Int]), + mustType(types.Instantiate(nil, pkg.Scope().Lookup("typ").Type(), []types.Type{ + types.Typ[types.Int], + types.Typ[types.String], + }, true)), + }, + }, + wantStr: "pkg/test.fun<[]int, pkg/test.typ[int, string]>", + }} + + for _, test := range tests { + t.Run(test.descr, func(t *testing.T) { + got := test.instance.String() + if got != test.wantStr { + t.Errorf("Got: instance string %q. Want: %q.", got, test.wantStr) + } + if test.wantTypeString != "" { + got = test.instance.TypeString() + if got != test.wantTypeString { + t.Errorf("Got: instance type string %q. Want: %q.", got, test.wantTypeString) + } + } + }) + } +} + +func TestInstanceQueue(t *testing.T) { + const src = `package test + type Typ[T any, V any] []T + func Fun[U any, W any](x, y U) {} + ` + f := srctesting.New(t) + _, pkg := f.Check("pkg/test", f.Parse("test.go", src)) + + i1 := Instance{ + Object: pkg.Scope().Lookup("Typ"), + TArgs: []types.Type{types.Typ[types.String], types.Typ[types.String]}, + } + i2 := Instance{ + Object: pkg.Scope().Lookup("Typ"), + TArgs: []types.Type{types.Typ[types.Int], types.Typ[types.Int]}, + } + i3 := Instance{ + Object: pkg.Scope().Lookup("Fun"), + TArgs: []types.Type{types.Typ[types.String], types.Typ[types.String]}, + } + + set := InstanceSet{} + set.Add(i1, i2) + + if ex := set.exhausted(); ex { + t.Errorf("Got: set.exhausted() = true. Want: false") + } + + gotValues := set.Values() + wantValues := []Instance{i1, i2} + if diff := cmp.Diff(wantValues, gotValues, instanceOpts()); diff != "" { + t.Errorf("set.Values() returned diff (-want,+got):\n%s", diff) + } + + p1, ok := set.next() + if !ok { + t.Errorf("Got: _, ok := set.next(); ok == false. Want: true.") + } + p2, ok := set.next() + if !ok { + t.Errorf("Got: _, ok := set.next(); ok == false. Want: true.") + } + if ex := set.exhausted(); !ex { + t.Errorf("Got: set.exhausted() = false. Want: true") + } + + _, ok = set.next() + if ok { + t.Errorf("Got: _, ok := set.next(); ok == true. Want: false.") + } + + set.Add(i1) // Has been enqueued before. + if ex := set.exhausted(); !ex { + t.Errorf("Got: set.exhausted() = false. Want: true") + } + + set.Add(i3) + p3, ok := set.next() + if !ok { + t.Errorf("Got: _, ok := set.next(); ok == false. Want: true.") + } + + added := []Instance{i1, i2, i3} + processed := []Instance{p1, p2, p3} + + diff := cmp.Diff(added, processed, instanceOpts()) + if diff != "" { + t.Errorf("Processed instances differ from added (-want,+got):\n%s", diff) + } + + gotValues = set.Values() + wantValues = []Instance{i1, i2, i3} + if diff := cmp.Diff(wantValues, gotValues, instanceOpts()); diff != "" { + t.Errorf("set.Values() returned diff (-want,+got):\n%s", diff) + } + + gotByObj := set.ByObj() + wantByObj := map[types.Object][]Instance{ + pkg.Scope().Lookup("Typ"): {i1, i2}, + pkg.Scope().Lookup("Fun"): {i3}, + } + if diff := cmp.Diff(wantByObj, gotByObj, instanceOpts()); diff != "" { + t.Errorf("set.ByObj() returned diff (-want,+got):\n%s", diff) + } +} + +func TestInstancesByPackage(t *testing.T) { + f := srctesting.New(t) + + const src1 = `package foo + type Typ[T any, V any] []T + ` + _, foo := f.Check("pkg/foo", f.Parse("foo.go", src1)) + + const src2 = `package bar + func Fun[U any, W any](x, y U) {} + ` + _, bar := f.Check("pkg/bar", f.Parse("bar.go", src2)) + + i1 := Instance{ + Object: foo.Scope().Lookup("Typ"), + TArgs: []types.Type{types.Typ[types.String], types.Typ[types.String]}, + } + i2 := Instance{ + Object: foo.Scope().Lookup("Typ"), + TArgs: []types.Type{types.Typ[types.Int], types.Typ[types.Int]}, + } + i3 := Instance{ + Object: bar.Scope().Lookup("Fun"), + TArgs: []types.Type{types.Typ[types.String], types.Typ[types.String]}, + } + + t.Run("Add", func(t *testing.T) { + instByPkg := PackageInstanceSets{} + instByPkg.Add(i1, i2, i3) + + gotFooInstances := instByPkg.Pkg(foo).Values() + wantFooInstances := []Instance{i1, i2} + if diff := cmp.Diff(wantFooInstances, gotFooInstances, instanceOpts()); diff != "" { + t.Errorf("instByPkg.Pkg(foo).Values() returned diff (-want,+got):\n%s", diff) + } + + gotValues := instByPkg.Pkg(bar).Values() + wantValues := []Instance{i3} + if diff := cmp.Diff(wantValues, gotValues, instanceOpts()); diff != "" { + t.Errorf("instByPkg.Pkg(bar).Values() returned diff (-want,+got):\n%s", diff) + } + }) + + t.Run("ID", func(t *testing.T) { + instByPkg := PackageInstanceSets{} + instByPkg.Add(i1, i2, i3) + + got := []int{ + instByPkg.ID(i1), + instByPkg.ID(i2), + instByPkg.ID(i3), + } + want := []int{0, 1, 0} + + if diff := cmp.Diff(want, got); diff != "" { + t.Errorf("unexpected instance IDs assigned (-want,+got):\n%s", diff) + } + }) +} diff --git a/compiler/internal/typeparams/map.go b/compiler/internal/typeparams/map.go new file mode 100644 index 000000000..7edbdc016 --- /dev/null +++ b/compiler/internal/typeparams/map.go @@ -0,0 +1,205 @@ +package typeparams + +import ( + "fmt" + "go/types" + "sort" + "strings" + + "golang.org/x/tools/go/types/typeutil" +) + +type ( + mapEntry[V any] struct { + key Instance + value V + } + mapBucket[V any] []*mapEntry[V] + mapBuckets[V any] map[uint32]mapBucket[V] +) + +// InstanceMap implements a map-like data structure keyed by instances. +// +// Zero value is an equivalent of an empty map. Methods are not thread-safe. +// +// Since Instance contains a slice and is not comparable, it can not be used as +// a regular map key, but we can compare its fields manually. When comparing +// instance equality, objects are compared by pointer equality, and type +// arguments with types.Identical(). To reduce access complexity, we bucket +// entries by a combined hash of type args. This type is generally inspired by +// [golang.org/x/tools/go/types/typeutil#Map] +type InstanceMap[V any] struct { + data map[types.Object]mapBuckets[V] + len int + hasher typeutil.Hasher +} + +// findIndex returns bucket and index of the entry with the given key. +// If the given key isn't found, an empty bucket and -1 are returned. +func (im *InstanceMap[V]) findIndex(key Instance) (mapBucket[V], int) { + if im != nil && im.data != nil { + bucket := im.data[key.Object][typeHash(im.hasher, key.TNest, key.TArgs)] + for i, candidate := range bucket { + if candidateArgsMatch(key, candidate) { + return bucket, i + } + } + } + return nil, -1 +} + +// get returns the stored value for the provided key and +// a bool indicating whether the key was present in the map or not. +func (im *InstanceMap[V]) get(key Instance) (V, bool) { + if bucket, i := im.findIndex(key); i >= 0 { + return bucket[i].value, true + } + var zero V + return zero, false +} + +// Get returns the stored value for the provided key. If the key is missing from +// the map, zero value is returned. +func (im *InstanceMap[V]) Get(key Instance) V { + val, _ := im.get(key) + return val +} + +// Has returns true if the given key is present in the map. +func (im *InstanceMap[V]) Has(key Instance) bool { + _, ok := im.get(key) + return ok +} + +// Set new value for the key in the map. Returns the previous value that was +// stored in the map, or zero value if the key wasn't present before. +func (im *InstanceMap[V]) Set(key Instance, value V) V { + if im.data == nil { + im.data = map[types.Object]mapBuckets[V]{} + im.hasher = typeutil.MakeHasher() + } + + if _, ok := im.data[key.Object]; !ok { + im.data[key.Object] = mapBuckets[V]{} + } + bucketID := typeHash(im.hasher, key.TNest, key.TArgs) + + // If there is already an identical key in the map, override the entry value. + hole := -1 + bucket := im.data[key.Object][bucketID] + for i, candidate := range bucket { + if candidate == nil { + hole = i + } else if candidateArgsMatch(key, candidate) { + old := candidate.value + candidate.value = value + return old + } + } + + // If there is a hole in the bucket, reuse it. + if hole >= 0 { + im.data[key.Object][bucketID][hole] = &mapEntry[V]{ + key: key, + value: value, + } + } else { + // Otherwise append a new entry. + im.data[key.Object][bucketID] = append(bucket, &mapEntry[V]{ + key: key, + value: value, + }) + } + im.len++ + var zero V + return zero +} + +// Len returns the number of elements in the map. +func (im *InstanceMap[V]) Len() int { + if im != nil { + return im.len + } + return 0 +} + +// Delete removes the entry with the given key, if any. +// It returns true if the entry was found. +func (im *InstanceMap[V]) Delete(key Instance) bool { + if bucket, i := im.findIndex(key); i >= 0 { + // We can't compact the bucket as it + // would disturb iterators. + bucket[i] = nil + im.len-- + return true + } + return false +} + +// Iterate calls function f on each entry in the map in unspecified order. +// +// Return true from f to continue the iteration, or false to stop it. +// +// If f should mutate the map, Iterate provides the same guarantees as +// Go maps: if f deletes a map entry that Iterate has not yet reached, +// f will not be invoked for it, but if f inserts a map entry that +// Iterate has not yet reached, whether or not f will be invoked for +// it is unspecified. +func (im *InstanceMap[V]) Iterate(f func(key Instance, value V)) { + if im != nil && im.data != nil { + for _, mapBucket := range im.data { + for _, bucket := range mapBucket { + for _, e := range bucket { + if e != nil { + f(e.key, e.value) + } + } + } + } + } +} + +// Keys returns a new slice containing the set of map keys. +// The order is unspecified. +func (im *InstanceMap[V]) Keys() []Instance { + keys := make([]Instance, 0, im.Len()) + im.Iterate(func(key Instance, _ V) { + keys = append(keys, key) + }) + return keys +} + +// String returns a string representation of the map's entries. +// The entries are sorted by string representation of the entry. +func (im *InstanceMap[V]) String() string { + entries := make([]string, 0, im.Len()) + im.Iterate(func(key Instance, value V) { + entries = append(entries, fmt.Sprintf("%v:%v", key, value)) + }) + sort.Strings(entries) + return `{` + strings.Join(entries, `, `) + `}` +} + +// candidateArgsMatch checks if the candidate entry has the same type +// arguments as the given key. +func candidateArgsMatch[V any](key Instance, candidate *mapEntry[V]) bool { + return candidate != nil && + candidate.key.TNest.Equal(key.TNest) && + candidate.key.TArgs.Equal(key.TArgs) +} + +// typeHash returns a combined hash of several types. +// +// Provided hasher is used to compute hashes of individual types, which are +// xor'ed together. Xor preserves bit distribution property, so the combined +// hash should be as good for bucketing, as the original. +func typeHash(hasher typeutil.Hasher, nestTypes, types []types.Type) uint32 { + var hash uint32 + for _, typ := range nestTypes { + hash ^= hasher.Hash(typ) + } + for _, typ := range types { + hash ^= hasher.Hash(typ) + } + return hash +} diff --git a/compiler/internal/typeparams/map_test.go b/compiler/internal/typeparams/map_test.go new file mode 100644 index 000000000..d67a1884d --- /dev/null +++ b/compiler/internal/typeparams/map_test.go @@ -0,0 +1,327 @@ +package typeparams + +import ( + "go/token" + "go/types" + "testing" +) + +func TestInstanceMap(t *testing.T) { + pkg := types.NewPackage(`testPkg`, `testPkg`) + + i1 := Instance{ + Object: types.NewTypeName(token.NoPos, pkg, "i1", nil), + TArgs: []types.Type{ + types.Typ[types.Int], + types.Typ[types.Int8], + }, + } + i1clone := Instance{ + Object: i1.Object, + TArgs: []types.Type{ + types.Typ[types.Int], + types.Typ[types.Int8], + }, + } + + i2 := Instance{ + Object: types.NewTypeName(token.NoPos, pkg, "i2", nil), // Different pointer. + TArgs: []types.Type{ + types.Typ[types.Int], + types.Typ[types.Int8], + }, + } + i3 := Instance{ + Object: i1.Object, + TArgs: []types.Type{ // Different type args, same number. + types.Typ[types.Int], + types.Typ[types.Int], + }, + } + i4 := Instance{ + Object: i1.Object, + TArgs: []types.Type{ // This hash matches i3's hash. + types.Typ[types.String], + types.Typ[types.String], + }, + } + i5 := Instance{ + Object: i1.Object, + TArgs: []types.Type{}, // This hash matches i3's hash. + } + + m := InstanceMap[string]{} + + // Check operations on a missing key. + t.Run("empty", func(t *testing.T) { + if got, want := m.String(), `{}`; got != want { + t.Errorf("Got: empty map string %q. Want: map string %q.", got, want) + } + if got := m.Has(i1); got { + t.Errorf("Got: empty map contains %s. Want: empty map contains nothing.", i1) + } + if got := m.Get(i1); got != "" { + t.Errorf("Got: getting missing key returned %q. Want: zero value.", got) + } + if got := m.Len(); got != 0 { + t.Errorf("Got: empty map length %d. Want: 0.", got) + } + if got := m.Set(i1, "abc"); got != "" { + t.Errorf("Got: setting a new key returned old value %q. Want: zero value", got) + } + if got := m.Len(); got != 1 { + t.Errorf("Got: map length %d. Want: 1.", got) + } + if got, want := m.String(), `{testPkg.i1:abc}`; got != want { + t.Errorf("Got: map string %q. Want: map string %q.", got, want) + } + if got, want := m.Keys(), []Instance{i1}; !keysMatch(got, want) { + t.Errorf("Got: map keys %v. Want: [i1].", got) + } + }) + + // Check operations on the existing key. + t.Run("first key", func(t *testing.T) { + if got := m.Set(i1, "def"); got != "abc" { + t.Errorf(`Got: setting an existing key returned old value %q. Want: "abc".`, got) + } + if got := m.Len(); got != 1 { + t.Errorf("Got: map length %d. Want: 1.", got) + } + if got := m.Has(i1); !got { + t.Errorf("Got: set map key is reported as missing. Want: key present.") + } + if got := m.Get(i1); got != "def" { + t.Errorf(`Got: getting set key returned %q. Want: "def"`, got) + } + if got := m.Get(i1clone); got != "def" { + t.Errorf(`Got: getting set key returned %q. Want: "def"`, got) + } + if got, want := m.String(), `{testPkg.i1:def}`; got != want { + t.Errorf("Got: map string %q. Want: map string %q.", got, want) + } + if got, want := m.Keys(), []Instance{i1}; !keysMatch(got, want) { + t.Errorf("Got: map keys %v. Want: [i1].", got) + } + }) + + // Check for key collisions with different object pointer. + t.Run("different object", func(t *testing.T) { + if got := m.Has(i2); got { + t.Errorf("Got: a new key %q is reported as present. Want: not present.", i2) + } + if got := m.Set(i2, "123"); got != "" { + t.Errorf("Got: a new key %q overrode an old value %q. Want: zero value.", i2, got) + } + if got := m.Get(i2); got != "123" { + t.Errorf(`Got: getting set key %q returned: %q. Want: "123"`, i2, got) + } + if got := m.Len(); got != 2 { + t.Errorf("Got: map length %d. Want: 2.", got) + } + }) + + // Check for collisions with different type arguments and different hash. + t.Run("different tArgs", func(t *testing.T) { + if got := m.Has(i3); got { + t.Errorf("Got: a new key %q is reported as present. Want: not present.", i3) + } + if got := m.Set(i3, "456"); got != "" { + t.Errorf("Got: a new key %q overrode an old value %q. Want: zero value.", i3, got) + } + if got := m.Get(i3); got != "456" { + t.Errorf(`Got: getting set key %q returned: %q. Want: "456"`, i3, got) + } + if got := m.Len(); got != 3 { + t.Errorf("Got: map length %d. Want: 3.", got) + } + }) + + // Check for collisions with different type arguments, same hash, count. + t.Run("different tArgs hash", func(t *testing.T) { + if got := m.Has(i4); got { + t.Errorf("Got: a new key %q is reported as present. Want: not present.", i3) + } + if got := m.Set(i4, "789"); got != "" { + t.Errorf("Got: a new key %q overrode an old value %q. Want: zero value.", i3, got) + } + if got := m.Get(i4); got != "789" { + t.Errorf(`Got: getting set key %q returned: %q. Want: "789"`, i3, got) + } + if got := m.Len(); got != 4 { + t.Errorf("Got: map length %d. Want: 4.", got) + } + }) + + // Check for collisions with different type arguments and same hash, but different count. + t.Run("different tArgs count", func(t *testing.T) { + if got := m.Has(i5); got { + t.Errorf("Got: a new key %q is reported as present. Want: not present.", i3) + } + if got := m.Set(i5, "ghi"); got != "" { + t.Errorf("Got: a new key %q overrode an old value %q. Want: zero value.", i3, got) + } + if got := m.Get(i5); got != "ghi" { + t.Errorf(`Got: getting set key %q returned: %q. Want: "ghi"`, i3, got) + } + if got := m.Len(); got != 5 { + t.Errorf("Got: map length %d. Want: 5.", got) + } + if got, want := m.String(), `{testPkg.i1:ghi, testPkg.i1:def, testPkg.i1:456, testPkg.i1:789, testPkg.i2:123}`; got != want { + t.Errorf("Got: map string %q. Want: map string %q.", got, want) + } + if got, want := m.Keys(), []Instance{i1, i2, i3, i4, i5}; !keysMatch(got, want) { + t.Errorf("Got: map keys %v. Want: [i1, i2, i3, i4, i5].", got) + } + }) + + // Check an existing entry can be deleted. + t.Run("delete existing", func(t *testing.T) { + if got := m.Delete(i3); !got { + t.Errorf("Got: deleting existing key %q returned not deleted. Want: found and deleted.", i3) + } + if got := m.Len(); got != 4 { + t.Errorf("Got: map length %d. Want: 4.", got) + } + if got := m.Has(i3); got { + t.Errorf("Got: a deleted key %q is reported as present. Want: not present.", i3) + } + if got, want := m.Keys(), []Instance{i1, i2, i4, i5}; !keysMatch(got, want) { + t.Errorf("Got: map keys %v. Want: [i1, i2, i4, i5].", got) + } + }) + + // Check deleting an existing entry has no effect. + t.Run("delete already deleted", func(t *testing.T) { + if got := m.Delete(i3); got { + t.Errorf("Got: deleting not present key %q returned as deleted. Want: not found.", i3) + } + if got := m.Len(); got != 4 { + t.Errorf("Got: map length %d. Want: 4.", got) + } + if got, want := m.Keys(), []Instance{i1, i2, i4, i5}; !keysMatch(got, want) { + t.Errorf("Got: map keys %v. Want: [i1, i2, i4, i5].", got) + } + }) + + // Check adding back a deleted value works (should fill hole in bucket). + t.Run("set deleted key", func(t *testing.T) { + if got := m.Set(i3, "jkl"); got != "" { + t.Errorf("Got: a new key %q overrode an old value %q. Want: zero value.", i3, got) + } + if got := m.Len(); got != 5 { + t.Errorf("Got: map length %d. Want: 5.", got) + } + if got, want := m.Keys(), []Instance{i1, i2, i3, i4, i5}; !keysMatch(got, want) { + t.Errorf("Got: map keys %v. Want: [i1, i2, i3, i4, i5].", got) + } + }) + + // Check deleting while iterating over the map. + t.Run("deleting while iterating", func(t *testing.T) { + notSeen := []Instance{i1, i2, i3, i4, i5} + seen := []Instance{} + kept := []Instance{} + var skipped Instance + m.Iterate(func(key Instance, value string) { + // update seen and not seen + seen = append(seen, key) + i := keyAt(notSeen, key) + if i < 0 { + t.Fatalf(`Got: failed to find current key %q in not seen. Want: it to be not seen yet.`, key) + } + notSeen = append(notSeen[:i], notSeen[i+1:]...) + + if len(seen) == 3 { + // delete the first seen key, the current key, and an unseen key + if got := m.Delete(seen[0]); !got { + t.Errorf("Got: deleting seen key %q returned not deleted. Want: found and deleted.", seen[0]) + } + if got := m.Delete(key); !got { + t.Errorf("Got: deleting current key %q returned not deleted. Want: found and deleted.", key) + } + skipped = notSeen[0] // skipped has not yet been seen so it should not be iterated over + if got := m.Delete(skipped); !got { + t.Errorf("Got: deleting not seen key %q returned not deleted. Want: found and deleted.", skipped) + } + kept = append(kept, seen[1], notSeen[1]) + } + }) + + if got := len(seen); got != 4 { + t.Errorf("Got: seen %d keys. Want: 4.", got) + } + if got := len(notSeen); got != 1 { + t.Errorf("Got: seen %d keys. Want: 1.", got) + } + if got := keyAt(notSeen, skipped); got != 0 { + t.Errorf("Got: a deleted unseen key %q was not the skipped key %q. Want: it to be skipped.", notSeen[0], skipped) + } + if got := m.Len(); got != 2 { + t.Errorf("Got: map length %d. Want: 2.", got) + } + if got := m.Keys(); !keysMatch(got, kept) { + t.Errorf("Got: map keys %v did not match kept keys. Want: %v.", got, kept) + } + }) +} + +func TestNilInstanceMap(t *testing.T) { + i1 := Instance{ + Object: types.NewTypeName(token.NoPos, nil, "i1", nil), + TArgs: []types.Type{ + types.Typ[types.Int], + types.Typ[types.Int8], + }, + } + + var m *InstanceMap[string] + if got, want := m.String(), `{}`; got != want { + t.Errorf("Got: nil map string %q. Want: map string %q.", got, want) + } + if got := m.Has(i1); got { + t.Errorf("Got: nil map contains %s. Want: nil map contains nothing.", i1) + } + if got := m.Get(i1); got != "" { + t.Errorf("Got: missing key returned %q. Want: zero value.", got) + } + if got := m.Len(); got != 0 { + t.Errorf("Got: nil map length %d. Want: 0.", got) + } + if got := m.Keys(); len(got) > 0 { + t.Errorf("Got: map keys %v did not match kept keys. Want: [].", got) + } + + // The only thing that a nil map can't safely handle is setting a key. + func() { + defer func() { + recover() + }() + m.Set(i1, "abc") + t.Errorf("Got: setting a new key on nil map did not panic, %s. Want: panic.", m.String()) + }() +} + +func keysMatch(a, b []Instance) bool { + if len(a) != len(b) { + return false + } + found := make([]bool, len(b)) + for _, v := range a { + i := keyAt(b, v) + if i < 0 || found[i] { + return false + } + found[i] = true + } + return true +} + +func keyAt(keys []Instance, target Instance) int { + for i, v := range keys { + if v.Object == target.Object && v.TArgs.Equal(target.TArgs) { + return i + } + } + return -1 +} diff --git a/compiler/internal/typeparams/utils.go b/compiler/internal/typeparams/utils.go new file mode 100644 index 000000000..ea528314e --- /dev/null +++ b/compiler/internal/typeparams/utils.go @@ -0,0 +1,141 @@ +package typeparams + +import ( + "errors" + "fmt" + "go/token" + "go/types" +) + +// SignatureTypeParams returns receiver type params for methods, or function +// type params for standalone functions, or nil for non-generic functions and +// methods. +func SignatureTypeParams(sig *types.Signature) *types.TypeParamList { + if tp := sig.RecvTypeParams(); tp != nil { + return tp + } else if tp := sig.TypeParams(); tp != nil { + return tp + } else { + return nil + } +} + +// FindNestingFunc returns the function or method that the given object +// is nested in, or nil if the object was defined at the package level. +func FindNestingFunc(obj types.Object) *types.Func { + objPos := obj.Pos() + if objPos == token.NoPos { + return nil + } + + scope := obj.Parent() + for scope != nil { + // Iterate over all declarations in the scope. + for _, name := range scope.Names() { + decl := scope.Lookup(name) + if fn, ok := decl.(*types.Func); ok { + // Check if the object's position is within the function's scope. + if objPos >= fn.Pos() && objPos <= fn.Scope().End() { + return fn + } + } + } + scope = scope.Parent() + } + return nil +} + +var ( + errInstantiatesGenerics = errors.New("instantiates generic type or function") + errDefinesGenerics = errors.New("defines generic type or function") +) + +// HasTypeParams returns true if object defines type parameters. +// +// Note: this function doe not check if the object definition actually uses the +// type parameters, neither its own, nor from the outer scope. +func HasTypeParams(typ types.Type) bool { + switch typ := typ.(type) { + case *types.Signature: + return typ.RecvTypeParams().Len() > 0 || typ.TypeParams().Len() > 0 + case *types.Named: + return typ.TypeParams().Len() > 0 + default: + return false + } +} + +// RequiresGenericsSupport returns an error if the type-checked code depends on +// generics support. +func RequiresGenericsSupport(info *types.Info) error { + for ident := range info.Instances { + // Any instantiation means dependency on generics. + return fmt.Errorf("%w: %v", errInstantiatesGenerics, info.ObjectOf(ident)) + } + + for _, obj := range info.Defs { + if obj == nil { + continue + } + if HasTypeParams(obj.Type()) { + return fmt.Errorf("%w: %v", errDefinesGenerics, obj) + } + } + + return nil +} + +// isGeneric will search all the given types and their subtypes for a +// *types.TypeParam. This will not check if a type could be generic, +// but if each instantiation is not completely concrete yet. +// +// This is useful to check for generics types like `X[B[T]]`, where +// `X` appears concrete because it is instantiated with the type argument `B[T]`, +// however the `T` inside `B[T]` is a type parameter making `X[B[T]]` a generic +// type since it required instantiation to a concrete type, e.g. `X[B[int]]`. +func isGeneric(typ ...types.Type) bool { + var containsTypeParam func(t types.Type) bool + + foreach := func(count int, getter func(index int) types.Type) bool { + for i := 0; i < count; i++ { + if containsTypeParam(getter(i)) { + return true + } + } + return false + } + + seen := make(map[types.Type]struct{}) + containsTypeParam = func(t types.Type) bool { + if _, ok := seen[t]; ok { + return false + } + seen[t] = struct{}{} + + switch t := t.(type) { + case *types.TypeParam: + return true + case *types.Named: + return t.TypeParams().Len() != t.TypeArgs().Len() || + foreach(t.TypeArgs().Len(), func(i int) types.Type { return t.TypeArgs().At(i) }) || + containsTypeParam(t.Underlying()) + case *types.Struct: + return foreach(t.NumFields(), func(i int) types.Type { return t.Field(i).Type() }) + case *types.Interface: + return foreach(t.NumMethods(), func(i int) types.Type { return t.Method(i).Type() }) + case *types.Signature: + return foreach(t.Params().Len(), func(i int) types.Type { return t.Params().At(i).Type() }) || + foreach(t.Results().Len(), func(i int) types.Type { return t.Results().At(i).Type() }) + case *types.Map: + return containsTypeParam(t.Key()) || containsTypeParam(t.Elem()) + case interface{ Elem() types.Type }: + // Handles *types.Pointer, *types.Slice, *types.Array, *types.Chan + return containsTypeParam(t.Elem()) + default: + // Other types (e.g., basic types) do not contain type parameters. + return false + } + } + + return foreach(len(typ), func(i int) types.Type { return typ[i] }) +} diff --git a/compiler/internal/typeparams/utils_test.go b/compiler/internal/typeparams/utils_test.go new file mode 100644 index 000000000..dda685273 --- /dev/null +++ b/compiler/internal/typeparams/utils_test.go @@ -0,0 +1,120 @@ +package typeparams + +import ( + "errors" + "go/token" + "go/types" + "testing" + + "github.com/gopherjs/gopherjs/internal/srctesting" +) + +func TestHasTypeParams(t *testing.T) { + pkg := types.NewPackage("test/pkg", "pkg") + empty := types.NewInterfaceType(nil, nil) + tParams := func() []*types.TypeParam { + return []*types.TypeParam{ + types.NewTypeParam(types.NewTypeName(token.NoPos, pkg, "T", types.Typ[types.String]), empty), + } + } + + tests := []struct { + descr string + typ types.Type + want bool + }{{ + descr: "generic function", + typ: types.NewSignatureType(nil, nil, tParams(), nil, nil, false), + want: true, + }, { + descr: "generic method", + typ: types.NewSignatureType(types.NewVar(token.NoPos, pkg, "t", nil), tParams(), nil, nil, nil, false), + want: true, + }, { + descr: "regular function", + typ: types.NewSignatureType(nil, nil, nil, nil, nil, false), + want: false, + }, { + descr: "generic type", + typ: func() types.Type { + typ := types.NewNamed(types.NewTypeName(token.NoPos, pkg, "Typ", nil), types.Typ[types.String], nil) + typ.SetTypeParams(tParams()) + return typ + }(), + want: true, + }, { + descr: "regular named type", + typ: types.NewNamed(types.NewTypeName(token.NoPos, pkg, "Typ", nil), types.Typ[types.String], nil), + want: false, + }, { + descr: "built-in type", + typ: types.Typ[types.String], + want: false, + }} + + for _, test := range tests { + t.Run(test.descr, func(t *testing.T) { + got := HasTypeParams(test.typ) + if got != test.want { + t.Errorf("Got: HasTypeParams(%v) = %v. Want: %v.", test.typ, got, test.want) + } + }) + } +} + +func TestRequiresGenericsSupport(t *testing.T) { + t.Run("generic func", func(t *testing.T) { + f := srctesting.New(t) + src := `package foo + func foo[T any](t T) {}` + info, _ := f.Check("pkg/foo", f.Parse("foo.go", src)) + + err := RequiresGenericsSupport(info) + if !errors.Is(err, errDefinesGenerics) { + t.Errorf("Got: RequiresGenericsSupport() = %v. Want: %v", err, errDefinesGenerics) + } + }) + + t.Run("generic type", func(t *testing.T) { + f := srctesting.New(t) + src := `package foo + type Foo[T any] struct{t T}` + info, _ := f.Check("pkg/foo", f.Parse("foo.go", src)) + + err := RequiresGenericsSupport(info) + if !errors.Is(err, errDefinesGenerics) { + t.Errorf("Got: RequiresGenericsSupport() = %v. Want: %v", err, errDefinesGenerics) + } + }) + + t.Run("imported generic instance", func(t *testing.T) { + f := srctesting.New(t) + f.Info = nil // Do not combine type checking info from different packages. + src1 := `package foo + type Foo[T any] struct{t T}` + f.Check("pkg/foo", f.Parse("foo.go", src1)) + + src2 := `package bar + import "pkg/foo" + func bar() { _ = foo.Foo[int]{} }` + info, _ := f.Check("pkg/bar", f.Parse("bar.go", src2)) + + err := RequiresGenericsSupport(info) + if !errors.Is(err, errInstantiatesGenerics) { + t.Errorf("Got: RequiresGenericsSupport() = %v. Want: %v", err, errInstantiatesGenerics) + } + }) + + t.Run("no generic usage", func(t *testing.T) { + f := srctesting.New(t) + src := `package foo + type Foo struct{} + func foo() { _ = Foo{} }` + info, _ := f.Check("pkg/foo", f.Parse("foo.go", src)) + + err := RequiresGenericsSupport(info) + if err != nil { + t.Errorf("Got: RequiresGenericsSupport() = %v. Want: nil", err) + } + }) +} diff --git a/compiler/jsFile/jsFile.go b/compiler/jsFile/jsFile.go new file mode 100644 index 000000000..b8ae9421f --- /dev/null +++ b/compiler/jsFile/jsFile.go @@ -0,0 +1,55 @@ +package jsFile + +import ( + "fmt" + "go/build" + "io" + "strings" + "time" + + "golang.org/x/tools/go/buildutil" +) + +// JSFile represents a *.inc.js file metadata and content. +type JSFile struct { + Path string // Full file path for the build context the file came from. + ModTime time.Time + Content []byte +} + +// JSFilesFromDir finds and loads any *.inc.js packages in the build context +// directory. +func JSFilesFromDir(bctx *build.Context, dir string) ([]JSFile, error) { + files, err := buildutil.ReadDir(bctx, dir) + if err != nil { + return nil, err + } + var jsFiles []JSFile + for _, file := range files { + if !strings.HasSuffix(file.Name(), ".inc.js") || file.IsDir() { + continue + } + if file.Name()[0] == '_' || file.Name()[0] == '.' { + continue // Skip "hidden" files that are typically ignored by the Go build system. + } + + path := buildutil.JoinPath(bctx, dir, file.Name()) + f, err := buildutil.OpenFile(bctx, path) + if err != nil { + return nil, fmt.Errorf("failed to open %s from %v: %w", path, bctx, err) + } + defer f.Close() + + content, err := io.ReadAll(f) + if err != nil { + return nil, fmt.Errorf("failed to read %s from %v: %w", path, bctx, err) + } + + jsFiles = append(jsFiles, JSFile{ + Path: path, + ModTime: file.ModTime(), + Content: content, + }) + } + return jsFiles, nil +} diff --git a/compiler/linkname/linkname.go b/compiler/linkname/linkname.go new file mode 100644 index 000000000..6c3a9623c --- /dev/null +++ b/compiler/linkname/linkname.go @@ -0,0 +1,163 @@ +package linkname + +import ( + "fmt" + "go/ast" + "go/token" + "strings" + + "github.com/gopherjs/gopherjs/compiler/astutil" + "github.com/gopherjs/gopherjs/compiler/internal/symbol" + "github.com/gopherjs/gopherjs/internal/errorList" +) + +// GoLinkname describes a go:linkname compiler directive found in the source code. +// +// GopherJS treats these directives in a way that resembles a symbolic link, +// where for a single given symbol implementation there may be zero or more +// symbols referencing it. This is subtly different from the upstream Go +// implementation, which simply overrides symbol name the linker will use. +type GoLinkname struct { + Implementation symbol.Name + Reference symbol.Name +} + +// ParseGoLinknames processed comments in a source file and extracts //go:linkname +// compiler directive from the comments. +// +// The following directive format is supported: +// //go:linkname . +// //go:linkname .. +// //go:linkname .<(*type)>. +// +// GopherJS directive support has the following limitations: +// +// - External linkname must be specified. +// - The directive must be applied to a package-level function or method (variables +// are not supported). +// - The local function referenced by the directive must have no body (in other +// words, it can only "import" an external function implementation into the +// local scope). +func ParseGoLinknames(fset *token.FileSet, pkgPath string, file *ast.File) ([]GoLinkname, error) { + var errs errorList.ErrorList = nil + var directives []GoLinkname + + isUnsafe := astutil.ImportsUnsafe(file) + + processComment := func(comment *ast.Comment) error { + if !strings.HasPrefix(comment.Text, "//go:linkname ") { + return nil // Not a linkname compiler directive. + } + + // TODO(nevkontakte): Ideally we should check that the directive comment + // is on a line by itself, line Go compiler does, but ast.Comment doesn't + // provide an easy way to find that out. + + if !isUnsafe { + return fmt.Errorf(`//go:linkname is only allowed in Go files that import "unsafe"`) + } + + fields := strings.Fields(comment.Text) + if len(fields) != 3 { + return fmt.Errorf(`usage (all fields required): //go:linkname localname importpath.extname`) + } + + localPkg, localName := pkgPath, fields[1] + extPkg, extName := "", fields[2] + if pos := strings.LastIndexByte(extName, '/'); pos != -1 { + if idx := strings.IndexByte(extName[pos+1:], '.'); idx != -1 { + extPkg, extName = extName[0:pos+idx+1], extName[pos+idx+2:] + } + } else if idx := strings.IndexByte(extName, '.'); idx != -1 { + extPkg, extName = extName[0:idx], extName[idx+1:] + } + + obj := file.Scope.Lookup(localName) + if obj == nil { + return fmt.Errorf("//go:linkname local symbol %q is not found in the current source file", localName) + } + + if obj.Kind != ast.Fun { + if pkgPath == "math/bits" || pkgPath == "reflect" { + // These standard library packages are known to use go:linkname with + // variables, which GopherJS doesn't support. We silently ignore such + // directives, since it doesn't seem to cause any problems. + return nil + } + return fmt.Errorf("gopherjs: //go:linkname is only supported for functions, got %q", obj.Kind) + } + + decl := obj.Decl.(*ast.FuncDecl) + if decl.Body != nil { + if pkgPath == "runtime" || pkgPath == "internal/bytealg" || pkgPath == "internal/fuzz" { + // These standard library packages are known to use unsupported + // "insert"-style go:linkname directives, which we ignore here and handle + // case-by-case in native overrides. + return nil + } + return fmt.Errorf("gopherjs: //go:linkname can not insert local implementation into an external package %q", extPkg) + } + // Local function has no body, treat it as a reference to an external implementation. + directives = append(directives, GoLinkname{ + Reference: symbol.Name{PkgPath: localPkg, Name: localName}, + Implementation: symbol.Name{PkgPath: extPkg, Name: extName}, + }) + return nil + } + + for _, cg := range file.Comments { + for _, c := range cg.List { + if err := processComment(c); err != nil { + errs = append(errs, errorAt(err, fset, c.Pos())) + } + } + } + + return directives, errs.ErrOrNil() +} + +// errorAt annotates an error with a position in the source code. +func errorAt(err error, fset *token.FileSet, pos token.Pos) error { + return fmt.Errorf("%s: %w", fset.Position(pos), err) +} + +// GoLinknameSet is a utility that enables quick lookup of whether a decl is +// affected by any go:linkname directive in the program. +type GoLinknameSet struct { + byImplementation map[symbol.Name][]GoLinkname + byReference map[symbol.Name]GoLinkname +} + +// Add more GoLinkname directives into the set. +func (gls *GoLinknameSet) Add(entries []GoLinkname) error { + if gls.byImplementation == nil { + gls.byImplementation = map[symbol.Name][]GoLinkname{} + } + if gls.byReference == nil { + gls.byReference = map[symbol.Name]GoLinkname{} + } + for _, e := range entries { + gls.byImplementation[e.Implementation] = append(gls.byImplementation[e.Implementation], e) + if prev, found := gls.byReference[e.Reference]; found { + return fmt.Errorf("conflicting go:linkname directives: two implementations for %q: %q and %q", + e.Reference, prev.Implementation, e.Implementation) + } + gls.byReference[e.Reference] = e + } + return nil +} + +// IsImplementation returns true if there is a directive referencing this symbol +// as an implementation. +func (gls *GoLinknameSet) IsImplementation(sym symbol.Name) bool { + _, found := gls.byImplementation[sym] + return found +} + +// FindImplementation returns a symbol name, which provides the implementation +// for the given symbol. The second value indicates whether the implementation +// was found. +func (gls *GoLinknameSet) FindImplementation(sym symbol.Name) (symbol.Name, bool) { + directive, found := gls.byReference[sym] + return directive.Implementation, found +} diff --git a/compiler/linkname/linkname_test.go b/compiler/linkname/linkname_test.go new file mode 100644 index 000000000..e2abc2825 --- /dev/null +++ b/compiler/linkname/linkname_test.go @@ -0,0 +1,174 @@ +package linkname + +import ( + "go/ast" + "go/importer" + "go/parser" + "go/token" + "go/types" + "strings" + "testing" + + "github.com/google/go-cmp/cmp" + "github.com/google/go-cmp/cmp/cmpopts" + "github.com/gopherjs/gopherjs/compiler/internal/symbol" +) + +func parseSource(t *testing.T, src string) (*ast.File, *token.FileSet) { + t.Helper() + + const filename = "" + fset := token.NewFileSet() + + file, err := parser.ParseFile(fset, filename, src, parser.ParseComments) + if err != nil { + t.Log(src) + t.Fatalf("Failed to parse source code: %s", err) + } + return file, fset +} + +func makePackage(t *testing.T, src string) *types.Package { + t.Helper() + + file, fset := parseSource(t, src) + conf := types.Config{Importer: importer.Default()} + pkg, err := conf.Check(file.Name.Name, fset, []*ast.File{file}, nil) + if err != nil { + t.Log(src) + t.Fatalf("Failed to type check source code: %s", err) + } + + return pkg +} + +func TestParseGoLinknames(t *testing.T) { + tests := []struct { + desc string + src string + wantError string + wantDirectives []GoLinkname + }{ + { + desc: "no directives", + src: `package testcase + + // This comment doesn't start with go:linkname + func a() {} + // go:linkname directive must have no space between the slash and the directive. + func b() {} + // An example in the middle of a comment is also not a directive: //go:linkname foo bar.baz + func c() {} + `, + wantDirectives: []GoLinkname{}, + }, { + desc: "normal use case", + src: `package testcase + + import _ "unsafe" + + //go:linkname a other/package.testcase_a + func a() + `, + wantDirectives: []GoLinkname{ + { + Reference: symbol.Name{PkgPath: "testcase", Name: "a"}, + Implementation: symbol.Name{PkgPath: "other/package", Name: "testcase_a"}, + }, + }, + }, { + desc: "multiple directives in one comment group", + src: `package testcase + import _ "unsafe" + + // The following functions are implemented elsewhere: + //go:linkname a other/package.a + //go:linkname b other/package.b + + func a() + func b() + `, + wantDirectives: []GoLinkname{ + { + Reference: symbol.Name{PkgPath: "testcase", Name: "a"}, + Implementation: symbol.Name{PkgPath: "other/package", Name: "a"}, + }, { + Reference: symbol.Name{PkgPath: "testcase", Name: "b"}, + Implementation: symbol.Name{PkgPath: "other/package", Name: "b"}, + }, + }, + }, { + desc: "unsafe not imported", + src: `package testcase + + //go:linkname a other/package.a + func a() + `, + wantError: `import "unsafe"`, + }, { + desc: "gopherjs: both parameters are required", + src: `package testcase + + import _ "unsafe" + + //go:linkname a + func a() + `, + wantError: "usage", + }, { + desc: "referenced function doesn't exist", + src: `package testcase + + import _ "unsafe" + + //go:linkname b other/package.b + func a() + `, + wantError: `"b" is not found`, + }, { + desc: "gopherjs: referenced a variable, not a function", + src: `package testcase + + import _ "unsafe" + + //go:linkname a other/package.a + var a string = "foo" + `, + wantError: `is only supported for functions`, + }, { + desc: "gopherjs: can not insert local implementation", + src: `package testcase + + import _ "unsafe" + + //go:linkname a other/package.a + func a() { println("do a") } + `, + wantError: `can not insert local implementation`, + }, + } + + for _, test := range tests { + t.Run(test.desc, func(t *testing.T) { + file, fset := parseSource(t, test.src) + directives, err := ParseGoLinknames(fset, "testcase", file) + + if test.wantError != "" { + if err == nil { + t.Fatalf("ParseGoLinknames() returned no error, want: %s.", test.wantError) + } else if !strings.Contains(err.Error(), test.wantError) { + t.Fatalf("ParseGoLinknames() returned error: %s. Want an error containing %q.", err, test.wantError) + } + return + } + + if err != nil { + t.Fatalf("ParseGoLinkanmes() returned error: %s. Want: no error.", err) + } + + if diff := cmp.Diff(test.wantDirectives, directives, cmpopts.EquateEmpty()); diff != "" { + t.Fatalf("ParseGoLinknames() returned diff (-want,+got):\n%s", diff) + } + }) + } +} diff --git a/compiler/natives/fs.go b/compiler/natives/fs.go deleted file mode 100644 index 13bbd3b53..000000000 --- a/compiler/natives/fs.go +++ /dev/null @@ -1,29 +0,0 @@ -// +build gopherjsdev - -package natives - -import ( - "go/build" - "log" - "net/http" - "os" - "strings" - - "github.com/shurcooL/httpfs/filter" -) - -// FS is a virtual filesystem that contains native packages. -var FS = filter.Keep( - http.Dir(importPathToDir("github.com/gopherjs/gopherjs/compiler/natives")), - func(path string, fi os.FileInfo) bool { - return path == "/" || path == "/src" || strings.HasPrefix(path, "/src/") - }, -) - -func importPathToDir(importPath string) string { - p, err := build.Import(importPath, "", build.FindOnly) - if err != nil { - log.Fatalln(err) - } - return p.Dir -} diff --git a/compiler/natives/fs_vfsdata.go b/compiler/natives/fs_vfsdata.go deleted file mode 100644 index 0be04e5f4..000000000 --- a/compiler/natives/fs_vfsdata.go +++ /dev/null @@ -1,1055 +0,0 @@ -// Code generated by vfsgen; DO NOT EDIT. - -// +build !gopherjsdev - -package natives - -import ( - "bytes" - "compress/gzip" - "fmt" - "io" - "io/ioutil" - "net/http" - "os" - pathpkg "path" - "time" -) - -// FS is a virtual filesystem that contains native packages. -var FS = func() http.FileSystem { - fs := vfsgen۰FS{ - "/": &vfsgen۰DirInfo{ - name: "/", - modTime: time.Date(2019, 5, 1, 6, 1, 9, 582016136, time.UTC), - }, - "/src": &vfsgen۰DirInfo{ - name: "src", - modTime: time.Date(2018, 4, 20, 9, 8, 7, 919304753, time.UTC), - }, - "/src/bytes": &vfsgen۰DirInfo{ - name: "bytes", - modTime: time.Date(2018, 4, 20, 9, 33, 19, 948206308, time.UTC), - }, - "/src/bytes/bytes.go": &vfsgen۰CompressedFileInfo{ - name: "bytes.go", - modTime: time.Date(2017, 10, 12, 19, 45, 13, 0, time.UTC), - 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"/src/reflect": &vfsgen۰DirInfo{ - name: "reflect", - modTime: time.Date(2019, 8, 11, 22, 48, 34, 27211540, time.UTC), - }, - "/src/reflect/example_test.go": &vfsgen۰CompressedFileInfo{ - name: "example_test.go", - modTime: time.Date(2017, 10, 12, 19, 45, 13, 0, time.UTC), - uncompressedSize: 311, - - compressedContent: 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- }, - } - fs["/"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src"].(os.FileInfo), - } - fs["/src"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/bytes"].(os.FileInfo), - fs["/src/crypto"].(os.FileInfo), - fs["/src/database"].(os.FileInfo), - fs["/src/debug"].(os.FileInfo), - fs["/src/encoding"].(os.FileInfo), - fs["/src/fmt"].(os.FileInfo), - fs["/src/go"].(os.FileInfo), - fs["/src/internal"].(os.FileInfo), - fs["/src/io"].(os.FileInfo), - fs["/src/math"].(os.FileInfo), - fs["/src/net"].(os.FileInfo), - fs["/src/os"].(os.FileInfo), - fs["/src/reflect"].(os.FileInfo), - fs["/src/regexp"].(os.FileInfo), - fs["/src/runtime"].(os.FileInfo), - fs["/src/strings"].(os.FileInfo), - fs["/src/sync"].(os.FileInfo), - fs["/src/syscall"].(os.FileInfo), - fs["/src/testing"].(os.FileInfo), - fs["/src/text"].(os.FileInfo), - fs["/src/time"].(os.FileInfo), - fs["/src/unicode"].(os.FileInfo), - } - fs["/src/bytes"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/bytes/bytes.go"].(os.FileInfo), - fs["/src/bytes/bytes_test.go"].(os.FileInfo), - } - fs["/src/crypto"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/crypto/internal"].(os.FileInfo), - fs["/src/crypto/rand"].(os.FileInfo), - fs["/src/crypto/x509"].(os.FileInfo), - } - fs["/src/crypto/internal"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/crypto/internal/subtle"].(os.FileInfo), - } - fs["/src/crypto/internal/subtle"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/crypto/internal/subtle/aliasing.go"].(os.FileInfo), - } - fs["/src/crypto/rand"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/crypto/rand/rand.go"].(os.FileInfo), - } - fs["/src/crypto/x509"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/crypto/x509/x509.go"].(os.FileInfo), - fs["/src/crypto/x509/x509_test.go"].(os.FileInfo), - } - fs["/src/database"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/database/sql"].(os.FileInfo), - } - fs["/src/database/sql"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/database/sql/driver"].(os.FileInfo), - } - fs["/src/database/sql/driver"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/database/sql/driver/driver_test.go"].(os.FileInfo), - } - fs["/src/debug"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/debug/elf"].(os.FileInfo), - } - fs["/src/debug/elf"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/debug/elf/elf_test.go"].(os.FileInfo), - } - fs["/src/encoding"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/encoding/gob"].(os.FileInfo), - fs["/src/encoding/json"].(os.FileInfo), - } - fs["/src/encoding/gob"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/encoding/gob/gob_test.go"].(os.FileInfo), - } - fs["/src/encoding/json"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/encoding/json/stream_test.go"].(os.FileInfo), - } - fs["/src/fmt"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/fmt/fmt_test.go"].(os.FileInfo), - } - fs["/src/go"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/go/token"].(os.FileInfo), - } - fs["/src/go/token"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/go/token/token_test.go"].(os.FileInfo), - } - fs["/src/internal"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/internal/bytealg"].(os.FileInfo), - fs["/src/internal/cpu"].(os.FileInfo), - fs["/src/internal/fmtsort"].(os.FileInfo), - fs["/src/internal/poll"].(os.FileInfo), - fs["/src/internal/syscall"].(os.FileInfo), - fs["/src/internal/testenv"].(os.FileInfo), - } - fs["/src/internal/bytealg"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/internal/bytealg/bytealg.go"].(os.FileInfo), - } - fs["/src/internal/cpu"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/internal/cpu/cpu.go"].(os.FileInfo), - } - fs["/src/internal/fmtsort"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/internal/fmtsort/fmtsort_test.go"].(os.FileInfo), - } - fs["/src/internal/poll"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/internal/poll/fd_poll.go"].(os.FileInfo), - } - fs["/src/internal/syscall"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/internal/syscall/unix"].(os.FileInfo), - } - fs["/src/internal/syscall/unix"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/internal/syscall/unix/unix.go"].(os.FileInfo), - } - fs["/src/internal/testenv"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/internal/testenv/testenv.go"].(os.FileInfo), - } - fs["/src/io"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/io/io_test.go"].(os.FileInfo), - } - fs["/src/math"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/math/big"].(os.FileInfo), - fs["/src/math/bits"].(os.FileInfo), - fs["/src/math/math.go"].(os.FileInfo), - fs["/src/math/math_test.go"].(os.FileInfo), - fs["/src/math/rand"].(os.FileInfo), - } - fs["/src/math/big"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/math/big/big.go"].(os.FileInfo), - fs["/src/math/big/big_test.go"].(os.FileInfo), - } - fs["/src/math/bits"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/math/bits/bits.go"].(os.FileInfo), - } - fs["/src/math/rand"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/math/rand/rand_test.go"].(os.FileInfo), - } - fs["/src/net"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/net/http"].(os.FileInfo), - fs["/src/net/net.go"].(os.FileInfo), - } - fs["/src/net/http"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/net/http/cookiejar"].(os.FileInfo), - fs["/src/net/http/fetch.go"].(os.FileInfo), - fs["/src/net/http/http.go"].(os.FileInfo), - } - fs["/src/net/http/cookiejar"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/net/http/cookiejar/example_test.go"].(os.FileInfo), - } - fs["/src/os"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/os/os.go"].(os.FileInfo), - fs["/src/os/signal"].(os.FileInfo), - } - fs["/src/os/signal"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/os/signal/signal.go"].(os.FileInfo), - } - fs["/src/reflect"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/reflect/example_test.go"].(os.FileInfo), - fs["/src/reflect/reflect.go"].(os.FileInfo), - fs["/src/reflect/reflect_test.go"].(os.FileInfo), - fs["/src/reflect/swapper.go"].(os.FileInfo), - } - fs["/src/regexp"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/regexp/regexp_test.go"].(os.FileInfo), - } - fs["/src/runtime"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/runtime/debug"].(os.FileInfo), - fs["/src/runtime/pprof"].(os.FileInfo), - fs["/src/runtime/runtime.go"].(os.FileInfo), - } - fs["/src/runtime/debug"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/runtime/debug/debug.go"].(os.FileInfo), - } - fs["/src/runtime/pprof"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/runtime/pprof/pprof.go"].(os.FileInfo), - } - fs["/src/strings"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/strings/strings.go"].(os.FileInfo), - fs["/src/strings/strings_test.go"].(os.FileInfo), - } - fs["/src/sync"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/sync/atomic"].(os.FileInfo), - fs["/src/sync/cond.go"].(os.FileInfo), - fs["/src/sync/export_test.go"].(os.FileInfo), - fs["/src/sync/pool.go"].(os.FileInfo), - fs["/src/sync/sync.go"].(os.FileInfo), - fs["/src/sync/sync_test.go"].(os.FileInfo), - fs["/src/sync/waitgroup.go"].(os.FileInfo), - } - fs["/src/sync/atomic"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/sync/atomic/atomic.go"].(os.FileInfo), - fs["/src/sync/atomic/atomic_test.go"].(os.FileInfo), - } - fs["/src/syscall"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/syscall/js"].(os.FileInfo), - fs["/src/syscall/syscall.go"].(os.FileInfo), - fs["/src/syscall/syscall_darwin.go"].(os.FileInfo), - fs["/src/syscall/syscall_linux.go"].(os.FileInfo), - fs["/src/syscall/syscall_nonlinux.go"].(os.FileInfo), - fs["/src/syscall/syscall_unix.go"].(os.FileInfo), - fs["/src/syscall/syscall_windows.go"].(os.FileInfo), - } - fs["/src/syscall/js"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/syscall/js/js.go"].(os.FileInfo), - } - fs["/src/testing"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/testing/example.go"].(os.FileInfo), - fs["/src/testing/ioutil.go"].(os.FileInfo), - fs["/src/testing/testing.go"].(os.FileInfo), - } - fs["/src/text"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/text/template"].(os.FileInfo), - } - fs["/src/text/template"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/text/template/template.go"].(os.FileInfo), - } - fs["/src/time"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/time/time.go"].(os.FileInfo), - fs["/src/time/time_test.go"].(os.FileInfo), - } - fs["/src/unicode"].(*vfsgen۰DirInfo).entries = []os.FileInfo{ - fs["/src/unicode/unicode.go"].(os.FileInfo), - } - - return fs -}() - -type vfsgen۰FS map[string]interface{} - -func (fs vfsgen۰FS) Open(path string) (http.File, error) { - path = pathpkg.Clean("/" + path) - f, ok := fs[path] - if !ok { - return nil, &os.PathError{Op: "open", Path: path, Err: os.ErrNotExist} - } - - switch f := f.(type) { - case *vfsgen۰CompressedFileInfo: - gr, err := gzip.NewReader(bytes.NewReader(f.compressedContent)) - if err != nil { - // This should never happen because we generate the gzip bytes such that they are always valid. - panic("unexpected error reading own gzip compressed bytes: " + err.Error()) - } - return &vfsgen۰CompressedFile{ - vfsgen۰CompressedFileInfo: f, - gr: gr, - }, nil - case *vfsgen۰FileInfo: - return &vfsgen۰File{ - vfsgen۰FileInfo: f, - Reader: bytes.NewReader(f.content), - }, nil - case *vfsgen۰DirInfo: - return &vfsgen۰Dir{ - vfsgen۰DirInfo: f, - }, nil - default: - // This should never happen because we generate only the above types. - panic(fmt.Sprintf("unexpected type %T", f)) - } -} - -// vfsgen۰CompressedFileInfo is a static definition of a gzip compressed file. -type vfsgen۰CompressedFileInfo struct { - name string - modTime time.Time - compressedContent []byte - uncompressedSize int64 -} - -func (f *vfsgen۰CompressedFileInfo) Readdir(count int) ([]os.FileInfo, error) { - return nil, fmt.Errorf("cannot Readdir from file %s", f.name) -} -func (f *vfsgen۰CompressedFileInfo) Stat() (os.FileInfo, error) { return f, nil } - -func (f *vfsgen۰CompressedFileInfo) GzipBytes() []byte { - return f.compressedContent -} - -func (f *vfsgen۰CompressedFileInfo) Name() string { return f.name } -func (f *vfsgen۰CompressedFileInfo) Size() int64 { return f.uncompressedSize } -func (f *vfsgen۰CompressedFileInfo) Mode() os.FileMode { return 0444 } -func (f *vfsgen۰CompressedFileInfo) ModTime() time.Time { return f.modTime } -func (f *vfsgen۰CompressedFileInfo) IsDir() bool { return false } -func (f *vfsgen۰CompressedFileInfo) Sys() interface{} { return nil } - -// vfsgen۰CompressedFile is an opened compressedFile instance. -type vfsgen۰CompressedFile struct { - *vfsgen۰CompressedFileInfo - gr *gzip.Reader - grPos int64 // Actual gr uncompressed position. - seekPos int64 // Seek uncompressed position. -} - -func (f *vfsgen۰CompressedFile) Read(p []byte) (n int, err error) { - if f.grPos > f.seekPos { - // Rewind to beginning. - err = f.gr.Reset(bytes.NewReader(f.compressedContent)) - if err != nil { - return 0, err - } - f.grPos = 0 - } - if f.grPos < f.seekPos { - // Fast-forward. - _, err = io.CopyN(ioutil.Discard, f.gr, f.seekPos-f.grPos) - if err != nil { - return 0, err - } - f.grPos = f.seekPos - } - n, err = f.gr.Read(p) - f.grPos += int64(n) - f.seekPos = f.grPos - return n, err -} -func (f *vfsgen۰CompressedFile) Seek(offset int64, whence int) (int64, error) { - switch whence { - case io.SeekStart: - f.seekPos = 0 + offset - case io.SeekCurrent: - f.seekPos += offset - case io.SeekEnd: - f.seekPos = f.uncompressedSize + offset - default: - panic(fmt.Errorf("invalid whence value: %v", whence)) - } - return f.seekPos, nil -} -func (f *vfsgen۰CompressedFile) Close() error { - return f.gr.Close() -} - -// vfsgen۰FileInfo is a static definition of an uncompressed file (because it's not worth gzip compressing). -type vfsgen۰FileInfo struct { - name string - modTime time.Time - content []byte -} - -func (f *vfsgen۰FileInfo) Readdir(count int) ([]os.FileInfo, error) { - return nil, fmt.Errorf("cannot Readdir from file %s", f.name) -} -func (f *vfsgen۰FileInfo) Stat() (os.FileInfo, error) { return f, nil } - -func (f *vfsgen۰FileInfo) NotWorthGzipCompressing() {} - -func (f *vfsgen۰FileInfo) Name() string { return f.name } -func (f *vfsgen۰FileInfo) Size() int64 { return int64(len(f.content)) } -func (f *vfsgen۰FileInfo) Mode() os.FileMode { return 0444 } -func (f *vfsgen۰FileInfo) ModTime() time.Time { return f.modTime } -func (f *vfsgen۰FileInfo) IsDir() bool { return false } -func (f *vfsgen۰FileInfo) Sys() interface{} { return nil } - -// vfsgen۰File is an opened file instance. -type vfsgen۰File struct { - *vfsgen۰FileInfo - *bytes.Reader -} - -func (f *vfsgen۰File) Close() error { - return nil -} - -// vfsgen۰DirInfo is a static definition of a directory. -type vfsgen۰DirInfo struct { - name string - modTime time.Time - entries []os.FileInfo -} - -func (d *vfsgen۰DirInfo) Read([]byte) (int, error) { - return 0, fmt.Errorf("cannot Read from directory %s", d.name) -} -func (d *vfsgen۰DirInfo) Close() error { return nil } -func (d *vfsgen۰DirInfo) Stat() (os.FileInfo, error) { return d, nil } - -func (d *vfsgen۰DirInfo) Name() string { return d.name } -func (d *vfsgen۰DirInfo) Size() int64 { return 0 } -func (d *vfsgen۰DirInfo) Mode() os.FileMode { return 0755 | os.ModeDir } -func (d *vfsgen۰DirInfo) ModTime() time.Time { return d.modTime } -func (d *vfsgen۰DirInfo) IsDir() bool { return true } -func (d *vfsgen۰DirInfo) Sys() interface{} { return nil } - -// vfsgen۰Dir is an opened dir instance. -type vfsgen۰Dir struct { - *vfsgen۰DirInfo - pos int // Position within entries for Seek and Readdir. -} - -func (d *vfsgen۰Dir) Seek(offset int64, whence int) (int64, error) { - if offset == 0 && whence == io.SeekStart { - d.pos = 0 - return 0, nil - } - return 0, fmt.Errorf("unsupported Seek in directory %s", d.name) -} - -func (d *vfsgen۰Dir) Readdir(count int) ([]os.FileInfo, error) { - if d.pos >= len(d.entries) && count > 0 { - return nil, io.EOF - } - if count <= 0 || count > len(d.entries)-d.pos { - count = len(d.entries) - d.pos - } - e := d.entries[d.pos : d.pos+count] - d.pos += count - return e, nil -} diff --git a/compiler/natives/doc.go b/compiler/natives/natives.go similarity index 71% rename from compiler/natives/doc.go rename to compiler/natives/natives.go index c176d5b33..373329760 100644 --- a/compiler/natives/doc.go +++ b/compiler/natives/natives.go @@ -5,4 +5,9 @@ // in src subfolder. package natives -//go:generate vfsgendev -source="github.com/gopherjs/gopherjs/compiler/natives".FS -tag=gopherjsdev +import "embed" + +// FS is a virtual filesystem that contains native packages. +// +//go:embed src +var FS embed.FS diff --git a/compiler/natives/src/bufio/bufio_test.go b/compiler/natives/src/bufio/bufio_test.go new file mode 100644 index 000000000..b97fe22f7 --- /dev/null +++ b/compiler/natives/src/bufio/bufio_test.go @@ -0,0 +1,10 @@ +//go:build js +// +build js + +package bufio_test + +import "testing" + +func TestReadStringAllocs(t *testing.T) { + t.Skip("Memory allocation counters are not available in GopherJS.") +} diff --git a/compiler/natives/src/bytes/bytes.go b/compiler/natives/src/bytes/bytes.go index 2bf919efd..1f74edc4f 100644 --- a/compiler/natives/src/bytes/bytes.go +++ b/compiler/natives/src/bytes/bytes.go @@ -1,3 +1,4 @@ +//go:build js // +build js package bytes diff --git a/compiler/natives/src/bytes/bytes_test.go b/compiler/natives/src/bytes/bytes_test.go index 1984e16db..e9d0e1690 100644 --- a/compiler/natives/src/bytes/bytes_test.go +++ b/compiler/natives/src/bytes/bytes_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package bytes_test diff --git a/compiler/natives/src/compress/gzip/example_test.go b/compiler/natives/src/compress/gzip/example_test.go new file mode 100644 index 000000000..b3f6fbe43 --- /dev/null +++ b/compiler/natives/src/compress/gzip/example_test.go @@ -0,0 +1,13 @@ +//go:build js && wasm +// +build js,wasm + +package gzip_test + +import ( + "fmt" +) + +// The test relies on a local HTTP server, which is not supported under NodeJS. +func Example_compressingReader() { + fmt.Println("the data to be compressed") +} diff --git a/compiler/natives/src/crypto/elliptic/nistec.go b/compiler/natives/src/crypto/elliptic/nistec.go new file mode 100644 index 000000000..326c602d5 --- /dev/null +++ b/compiler/natives/src/crypto/elliptic/nistec.go @@ -0,0 +1,81 @@ +//go:build js +// +build js + +package elliptic + +import ( + "crypto/internal/nistec" + "math/big" +) + +// nistPoint uses generics so must be removed for generic-less GopherJS. +// All the following code changes in this file are to make p224, p256, +// p521, and p384 still function correctly without this generic struct. +// +//gopherjs:purge for go1.19 without generics +type nistPoint[T any] interface{} + +// nistCurve replaces the generics with a version using the wrappedPoint +// interface, then update all the method signatures to also use wrappedPoint. +type nistCurve struct { + newPoint func() nistec.WrappedPoint + params *CurveParams +} + +//gopherjs:override-signature +func (curve *nistCurve) Params() *CurveParams + +//gopherjs:override-signature +func (curve *nistCurve) IsOnCurve(x, y *big.Int) bool + +//gopherjs:override-signature +func (curve *nistCurve) pointFromAffine(x, y *big.Int) (p nistec.WrappedPoint, err error) + +//gopherjs:override-signature +func (curve *nistCurve) pointToAffine(p nistec.WrappedPoint) (x, y *big.Int) + +//gopherjs:override-signature +func (curve *nistCurve) Add(x1, y1, x2, y2 *big.Int) (*big.Int, *big.Int) + +//gopherjs:override-signature +func (curve *nistCurve) Double(x1, y1 *big.Int) (*big.Int, *big.Int) + +//gopherjs:override-signature +func (curve *nistCurve) normalizeScalar(scalar []byte) []byte + +//gopherjs:override-signature +func (curve *nistCurve) ScalarMult(Bx, By *big.Int, scalar []byte) (*big.Int, *big.Int) + +//gopherjs:override-signature +func (curve *nistCurve) ScalarBaseMult(scalar []byte) (*big.Int, *big.Int) + +//gopherjs:override-signature +func (curve *nistCurve) CombinedMult(Px, Py *big.Int, s1, s2 []byte) (x, y *big.Int) + +//gopherjs:override-signature +func (curve *nistCurve) Unmarshal(data []byte) (x, y *big.Int) + +//gopherjs:override-signature +func (curve *nistCurve) UnmarshalCompressed(data []byte) (x, y *big.Int) + +var p224 = &nistCurve{ + newPoint: nistec.NewP224WrappedPoint, +} + +type p256Curve struct { + nistCurve +} + +var p256 = &p256Curve{ + nistCurve: nistCurve{ + newPoint: nistec.NewP256WrappedPoint, + }, +} + +var p521 = &nistCurve{ + newPoint: nistec.NewP521WrappedPoint, +} + +var p384 = &nistCurve{ + newPoint: nistec.NewP384WrappedPoint, +} diff --git a/compiler/natives/src/crypto/internal/boring/bbig/big.go b/compiler/natives/src/crypto/internal/boring/bbig/big.go new file mode 100644 index 000000000..3a726ba3c --- /dev/null +++ b/compiler/natives/src/crypto/internal/boring/bbig/big.go @@ -0,0 +1,42 @@ +//go:build js +// +build js + +package bbig + +import ( + "crypto/internal/boring" + "math/big" +) + +func Enc(b *big.Int) boring.BigInt { + if b == nil { + return nil + } + x := b.Bits() + if len(x) == 0 { + return boring.BigInt{} + } + // Replacing original which uses unsafe: + // return unsafe.Slice((*uint)(&x[0]), len(x)) + b2 := make(boring.BigInt, len(x)) + for i, w := range x { + b2[i] = uint(w) + } + return b2 +} + +func Dec(b boring.BigInt) *big.Int { + if b == nil { + return nil + } + if len(b) == 0 { + return new(big.Int) + } + // Replacing original which uses unsafe: + // x := unsafe.Slice((*big.Word)(&b[0]), len(b)) + x := make([]big.Word, len(b)) + for i, w := range b { + x[i] = big.Word(w) + } + return new(big.Int).SetBits(x) +} diff --git a/compiler/natives/src/crypto/internal/boring/bcache/cache.go b/compiler/natives/src/crypto/internal/boring/bcache/cache.go new file mode 100644 index 000000000..afff404ce --- /dev/null +++ b/compiler/natives/src/crypto/internal/boring/bcache/cache.go @@ -0,0 +1,30 @@ +//go:build js +// +build js + +package bcache + +import "unsafe" + +// Cache relies on GC to periodically clear the cache. +// Since GopherJS doesn't have the same GC hooks, it currently can not +// register this cache with the GC. +// Without this cache Boring crypto, in particular public and private +// RSA and ECDSA keys, will be slower because the cache will always miss. +type Cache struct{} + +func (c *Cache) Register() {} +func (c *Cache) Clear() {} +func (c *Cache) Get(k unsafe.Pointer) unsafe.Pointer { return nil } +func (c *Cache) Put(k, v unsafe.Pointer) {} + +//gopherjs:purge +func (c *Cache) table() *[cacheSize]unsafe.Pointer + +//gopherjs:purge +type cacheEntry struct{} + +//gopherjs:purge +func registerCache(unsafe.Pointer) + +//gopherjs:purge +const cacheSize = 1021 diff --git a/compiler/natives/src/crypto/internal/boring/bcache/cache_test.go b/compiler/natives/src/crypto/internal/boring/bcache/cache_test.go new file mode 100644 index 000000000..12f2c4da4 --- /dev/null +++ b/compiler/natives/src/crypto/internal/boring/bcache/cache_test.go @@ -0,0 +1,10 @@ +//go:build js +// +build js + +package bcache + +import "testing" + +func TestCache(t *testing.T) { + t.Skip(`This test uses runtime.GC(), which GopherJS doesn't support`) +} diff --git a/compiler/natives/src/crypto/internal/boring/sig/sig.go b/compiler/natives/src/crypto/internal/boring/sig/sig.go new file mode 100644 index 000000000..3eb2454aa --- /dev/null +++ b/compiler/natives/src/crypto/internal/boring/sig/sig.go @@ -0,0 +1,13 @@ +//go:build js +// +build js + +package sig + +// Setting to no-op +func BoringCrypto() {} + +// Setting to no-op +func FIPSOnly() {} + +// Setting to no-op +func StandardCrypto() {} diff --git a/compiler/natives/src/crypto/internal/edwards25519/field/fe_alias_test.go b/compiler/natives/src/crypto/internal/edwards25519/field/fe_alias_test.go new file mode 100644 index 000000000..db4af600d --- /dev/null +++ b/compiler/natives/src/crypto/internal/edwards25519/field/fe_alias_test.go @@ -0,0 +1,16 @@ +//go:build js + +package field + +import ( + "testing" + "testing/quick" +) + +//gopherjs:keep-original +func TestAliasing(t *testing.T) { + // The test heavily uses 64-bit math, which is slow under GopherJS. Reducing + // the number of iterations makes run time more manageable. + t.Cleanup(quick.GopherJSInternalMaxCountCap(100)) + _gopherjs_original_TestAliasing(t) +} diff --git a/compiler/natives/src/crypto/internal/edwards25519/field/fe_test.go b/compiler/natives/src/crypto/internal/edwards25519/field/fe_test.go new file mode 100644 index 000000000..9f8c898d5 --- /dev/null +++ b/compiler/natives/src/crypto/internal/edwards25519/field/fe_test.go @@ -0,0 +1,9 @@ +//go:build js + +package field + +import "testing/quick" + +// Tests in this package use 64-bit math, which is slow under GopherJS. To keep +// test run time reasonable, we reduce the number of test iterations. +var quickCheckConfig1024 = &quick.Config{MaxCountScale: 10} diff --git a/compiler/natives/src/crypto/internal/edwards25519/scalar_test.go b/compiler/natives/src/crypto/internal/edwards25519/scalar_test.go new file mode 100644 index 000000000..ec862a349 --- /dev/null +++ b/compiler/natives/src/crypto/internal/edwards25519/scalar_test.go @@ -0,0 +1,9 @@ +//go:build js + +package edwards25519 + +import "testing/quick" + +// Tests in this package use 64-bit math, which is slow under GopherJS. To keep +// test run time reasonable, we reduce the number of test iterations. +var quickCheckConfig1024 = &quick.Config{MaxCountScale: 1} diff --git a/compiler/natives/src/crypto/internal/edwards25519/scalarmult_test.go b/compiler/natives/src/crypto/internal/edwards25519/scalarmult_test.go new file mode 100644 index 000000000..9cacfb24c --- /dev/null +++ b/compiler/natives/src/crypto/internal/edwards25519/scalarmult_test.go @@ -0,0 +1,9 @@ +//go:build js + +package edwards25519 + +import "testing/quick" + +// Tests in this package use 64-bit math, which is slow under GopherJS. To keep +// test run time reasonable, we reduce the number of test iterations. +var quickCheckConfig32 = &quick.Config{MaxCountScale: 0.5} diff --git a/compiler/natives/src/crypto/internal/nistec/nistec_test.go b/compiler/natives/src/crypto/internal/nistec/nistec_test.go new file mode 100644 index 000000000..d755e7ec3 --- /dev/null +++ b/compiler/natives/src/crypto/internal/nistec/nistec_test.go @@ -0,0 +1,89 @@ +//go:build js +// +build js + +package nistec_test + +import ( + "crypto/elliptic" + "crypto/internal/nistec" + "testing" +) + +func TestAllocations(t *testing.T) { + t.Skip("testing.AllocsPerRun not supported in GopherJS") +} + +//gopherjs:purge +type nistPoint[T any] interface{} + +func TestEquivalents(t *testing.T) { + t.Run("P224", func(t *testing.T) { + testEquivalents(t, nistec.NewP224WrappedPoint, nistec.NewP224WrappedGenerator, elliptic.P224()) + }) + t.Run("P256", func(t *testing.T) { + testEquivalents(t, nistec.NewP256WrappedPoint, nistec.NewP256WrappedGenerator, elliptic.P256()) + }) + t.Run("P384", func(t *testing.T) { + testEquivalents(t, nistec.NewP384WrappedPoint, nistec.NewP384WrappedGenerator, elliptic.P384()) + }) + t.Run("P521", func(t *testing.T) { + testEquivalents(t, nistec.NewP521WrappedPoint, nistec.NewP521WrappedGenerator, elliptic.P521()) + }) +} + +//gopherjs:override-signature +func testEquivalents(t *testing.T, newPoint, newGenerator func() nistec.WrappedPoint, c elliptic.Curve) + +func TestScalarMult(t *testing.T) { + t.Run("P224", func(t *testing.T) { + testScalarMult(t, nistec.NewP224WrappedPoint, nistec.NewP224WrappedGenerator, elliptic.P224()) + }) + t.Run("P256", func(t *testing.T) { + testScalarMult(t, nistec.NewP256WrappedPoint, nistec.NewP256WrappedGenerator, elliptic.P256()) + }) + t.Run("P384", func(t *testing.T) { + testScalarMult(t, nistec.NewP384WrappedPoint, nistec.NewP384WrappedGenerator, elliptic.P384()) + }) + t.Run("P521", func(t *testing.T) { + testScalarMult(t, nistec.NewP521WrappedPoint, nistec.NewP521WrappedGenerator, elliptic.P521()) + }) +} + +//gopherjs:override-signature +func testScalarMult(t *testing.T, newPoint, newGenerator func() nistec.WrappedPoint, c elliptic.Curve) + +func BenchmarkScalarMult(b *testing.B) { + b.Run("P224", func(b *testing.B) { + benchmarkScalarMult(b, nistec.NewP224WrappedGenerator(), 28) + }) + b.Run("P256", func(b *testing.B) { + benchmarkScalarMult(b, nistec.NewP256WrappedGenerator(), 32) + }) + b.Run("P384", func(b *testing.B) { + benchmarkScalarMult(b, nistec.NewP384WrappedGenerator(), 48) + }) + b.Run("P521", func(b *testing.B) { + benchmarkScalarMult(b, nistec.NewP521WrappedGenerator(), 66) + }) +} + +//gopherjs:override-signature +func benchmarkScalarMult(b *testing.B, p nistec.WrappedPoint, scalarSize int) + +func BenchmarkScalarBaseMult(b *testing.B) { + b.Run("P224", func(b *testing.B) { + benchmarkScalarBaseMult(b, nistec.NewP224WrappedGenerator(), 28) + }) + b.Run("P256", func(b *testing.B) { + benchmarkScalarBaseMult(b, nistec.NewP256WrappedGenerator(), 32) + }) + b.Run("P384", func(b *testing.B) { + benchmarkScalarBaseMult(b, nistec.NewP384WrappedGenerator(), 48) + }) + b.Run("P521", func(b *testing.B) { + benchmarkScalarBaseMult(b, nistec.NewP521WrappedGenerator(), 66) + }) +} + +//gopherjs:override-signature +func benchmarkScalarBaseMult(b *testing.B, p nistec.WrappedPoint, scalarSize int) diff --git a/compiler/natives/src/crypto/internal/nistec/wrapper.go b/compiler/natives/src/crypto/internal/nistec/wrapper.go new file mode 100644 index 000000000..0d6706b52 --- /dev/null +++ b/compiler/natives/src/crypto/internal/nistec/wrapper.go @@ -0,0 +1,185 @@ +//go:build js +// +build js + +package nistec + +type WrappedPoint interface { + Bytes() []byte + SetBytes(b []byte) (WrappedPoint, error) + Add(w1, w2 WrappedPoint) WrappedPoint + Double(w1 WrappedPoint) WrappedPoint + ScalarMult(w1 WrappedPoint, scalar []byte) (WrappedPoint, error) + ScalarBaseMult(scalar []byte) (WrappedPoint, error) +} + +type p224Wrapper struct { + point *P224Point +} + +func wrapP224(point *P224Point) WrappedPoint { + return p224Wrapper{point: point} +} + +func NewP224WrappedPoint() WrappedPoint { + return wrapP224(NewP224Point()) +} + +func NewP224WrappedGenerator() WrappedPoint { + return wrapP224(NewP224Generator()) +} + +func (w p224Wrapper) Bytes() []byte { + return w.point.Bytes() +} + +func (w p224Wrapper) SetBytes(b []byte) (WrappedPoint, error) { + p, err := w.point.SetBytes(b) + return wrapP224(p), err +} + +func (w p224Wrapper) Add(w1, w2 WrappedPoint) WrappedPoint { + return wrapP224(w.point.Add(w1.(p224Wrapper).point, w2.(p224Wrapper).point)) +} + +func (w p224Wrapper) Double(w1 WrappedPoint) WrappedPoint { + return wrapP224(w.point.Double(w1.(p224Wrapper).point)) +} + +func (w p224Wrapper) ScalarMult(w1 WrappedPoint, scalar []byte) (WrappedPoint, error) { + p, err := w.point.ScalarMult(w1.(p224Wrapper).point, scalar) + return wrapP224(p), err +} + +func (w p224Wrapper) ScalarBaseMult(scalar []byte) (WrappedPoint, error) { + p, err := w.point.ScalarBaseMult(scalar) + return wrapP224(p), err +} + +type p256Wrapper struct { + point *P256Point +} + +func wrapP256(point *P256Point) WrappedPoint { + return p256Wrapper{point: point} +} + +func NewP256WrappedPoint() WrappedPoint { + return wrapP256(NewP256Point()) +} + +func NewP256WrappedGenerator() WrappedPoint { + return wrapP256(NewP256Generator()) +} + +func (w p256Wrapper) Bytes() []byte { + return w.point.Bytes() +} + +func (w p256Wrapper) SetBytes(b []byte) (WrappedPoint, error) { + p, err := w.point.SetBytes(b) + return wrapP256(p), err +} + +func (w p256Wrapper) Add(w1, w2 WrappedPoint) WrappedPoint { + return wrapP256(w.point.Add(w1.(p256Wrapper).point, w2.(p256Wrapper).point)) +} + +func (w p256Wrapper) Double(w1 WrappedPoint) WrappedPoint { + return wrapP256(w.point.Double(w1.(p256Wrapper).point)) +} + +func (w p256Wrapper) ScalarMult(w1 WrappedPoint, scalar []byte) (WrappedPoint, error) { + p, err := w.point.ScalarMult(w1.(p256Wrapper).point, scalar) + return wrapP256(p), err +} + +func (w p256Wrapper) ScalarBaseMult(scalar []byte) (WrappedPoint, error) { + p, err := w.point.ScalarBaseMult(scalar) + return wrapP256(p), err +} + +type p521Wrapper struct { + point *P521Point +} + +func wrapP521(point *P521Point) WrappedPoint { + return p521Wrapper{point: point} +} + +func NewP521WrappedPoint() WrappedPoint { + return wrapP521(NewP521Point()) +} + +func NewP521WrappedGenerator() WrappedPoint { + return wrapP521(NewP521Generator()) +} + +func (w p521Wrapper) Bytes() []byte { + return w.point.Bytes() +} + +func (w p521Wrapper) SetBytes(b []byte) (WrappedPoint, error) { + p, err := w.point.SetBytes(b) + return wrapP521(p), err +} + +func (w p521Wrapper) Add(w1, w2 WrappedPoint) WrappedPoint { + return wrapP521(w.point.Add(w1.(p521Wrapper).point, w2.(p521Wrapper).point)) +} + +func (w p521Wrapper) Double(w1 WrappedPoint) WrappedPoint { + return wrapP521(w.point.Double(w1.(p521Wrapper).point)) +} + +func (w p521Wrapper) ScalarMult(w1 WrappedPoint, scalar []byte) (WrappedPoint, error) { + p, err := w.point.ScalarMult(w1.(p521Wrapper).point, scalar) + return wrapP521(p), err +} + +func (w p521Wrapper) ScalarBaseMult(scalar []byte) (WrappedPoint, error) { + p, err := w.point.ScalarBaseMult(scalar) + return wrapP521(p), err +} + +type p384Wrapper struct { + point *P384Point +} + +func wrapP384(point *P384Point) WrappedPoint { + return p384Wrapper{point: point} +} + +func NewP384WrappedPoint() WrappedPoint { + return wrapP384(NewP384Point()) +} + +func NewP384WrappedGenerator() WrappedPoint { + return wrapP384(NewP384Generator()) +} + +func (w p384Wrapper) Bytes() []byte { + return w.point.Bytes() +} + +func (w p384Wrapper) SetBytes(b []byte) (WrappedPoint, error) { + p, err := w.point.SetBytes(b) + return wrapP384(p), err +} + +func (w p384Wrapper) Add(w1, w2 WrappedPoint) WrappedPoint { + return wrapP384(w.point.Add(w1.(p384Wrapper).point, w2.(p384Wrapper).point)) +} + +func (w p384Wrapper) Double(w1 WrappedPoint) WrappedPoint { + return wrapP384(w.point.Double(w1.(p384Wrapper).point)) +} + +func (w p384Wrapper) ScalarMult(w1 WrappedPoint, scalar []byte) (WrappedPoint, error) { + p, err := w.point.ScalarMult(w1.(p384Wrapper).point, scalar) + return wrapP384(p), err +} + +func (w p384Wrapper) ScalarBaseMult(scalar []byte) (WrappedPoint, error) { + p, err := w.point.ScalarBaseMult(scalar) + return wrapP384(p), err +} diff --git a/compiler/natives/src/crypto/internal/subtle/aliasing.go b/compiler/natives/src/crypto/internal/subtle/aliasing.go index 50cc9712d..145687d59 100644 --- a/compiler/natives/src/crypto/internal/subtle/aliasing.go +++ b/compiler/natives/src/crypto/internal/subtle/aliasing.go @@ -1,7 +1,13 @@ +//go:build js // +build js package subtle +// This file duplicated is these two locations: +// - src/crypto/internal/subtle/aliasing.go +// - src/golang.org/x/crypto/internal/subtle/aliasing.go +// - src/golang.org/x/crypto/internal/alias/alias.go + import "github.com/gopherjs/gopherjs/js" // AnyOverlap reports whether x and y share memory at any (not necessarily diff --git a/compiler/natives/src/crypto/rand/rand.go b/compiler/natives/src/crypto/rand/rand.go index afdab8b85..1c3631a02 100644 --- a/compiler/natives/src/crypto/rand/rand.go +++ b/compiler/natives/src/crypto/rand/rand.go @@ -1,3 +1,4 @@ +//go:build js // +build js package rand @@ -8,13 +9,9 @@ import ( "github.com/gopherjs/gopherjs/js" ) -func init() { - Reader = &rngReader{} -} - -type rngReader struct{} +type reader struct{} -func (r *rngReader) Read(b []byte) (n int, err error) { +func (r *reader) Read(b []byte) (n int, err error) { array := js.InternalObject(b).Get("$array") offset := js.InternalObject(b).Get("$offset").Int() @@ -47,15 +44,3 @@ func (r *rngReader) Read(b []byte) (n int, err error) { return 0, errors.New("crypto/rand not available in this environment") } - -func batched(f func([]byte) bool, readMax int) func([]byte) bool { - return func(buf []byte) bool { - for len(buf) > readMax { - if !f(buf[:readMax]) { - return false - } - buf = buf[readMax:] - } - return len(buf) == 0 || f(buf) - } -} diff --git a/compiler/natives/src/crypto/tls/handshake_test.go b/compiler/natives/src/crypto/tls/handshake_test.go new file mode 100644 index 000000000..b5fe59a57 --- /dev/null +++ b/compiler/natives/src/crypto/tls/handshake_test.go @@ -0,0 +1,85 @@ +//go:build js + +package tls + +import ( + "context" + "runtime" + "testing" +) + +// Same as upstream, except we check for GOARCH=ecmascript instead of wasm. +// This override can be removed after https://github.com/golang/go/pull/51827 +// is available in the upstream (likely after Go 1.19). +func TestServerHandshakeContextCancellation(t *testing.T) { + c, s := localPipe(t) + ctx, cancel := context.WithCancel(context.Background()) + unblockClient := make(chan struct{}) + defer close(unblockClient) + go func() { + cancel() + <-unblockClient + _ = c.Close() + }() + conn := Server(s, testConfig) + // Initiates server side handshake, which will block until a client hello is read + // unless the cancellation works. + err := conn.HandshakeContext(ctx) + if err == nil { + t.Fatal("Server handshake did not error when the context was canceled") + } + if err != context.Canceled { + t.Errorf("Unexpected server handshake error: %v", err) + } + if runtime.GOARCH == "ecmascript" { + t.Skip("conn.Close does not error as expected when called multiple times on WASM") + } + err = conn.Close() + if err == nil { + t.Error("Server connection was not closed when the context was canceled") + } +} + +// Same as upstream, except we check for GOARCH=ecmascript instead of wasm. +// This override can be removed after https://github.com/golang/go/pull/51827 +// is available in the upstream (likely after Go 1.19). +func TestClientHandshakeContextCancellation(t *testing.T) { + c, s := localPipe(t) + ctx, cancel := context.WithCancel(context.Background()) + unblockServer := make(chan struct{}) + defer close(unblockServer) + go func() { + cancel() + <-unblockServer + _ = s.Close() + }() + cli := Client(c, testConfig) + // Initiates client side handshake, which will block until the client hello is read + // by the server, unless the cancellation works. + err := cli.HandshakeContext(ctx) + if err == nil { + t.Fatal("Client handshake did not error when the context was canceled") + } + if err != context.Canceled { + t.Errorf("Unexpected client handshake error: %v", err) + } + if runtime.GOARCH == "ecmascript" { + t.Skip("conn.Close does not error as expected when called multiple times on WASM") + } + err = cli.Close() + if err == nil { + t.Error("Client connection was not closed when the context was canceled") + } +} + +func TestVerifyConnection(t *testing.T) { + // This should be rechecked after upgrading to Go 1.20 or later. + // go1.19.13/src/crypto/tls/handshake_test.go:testRSACertificateIssuer has expired. + t.Skip("Skipping test that uses predefined certificate that expired in Jan 1st 2025") +} + +func TestResumptionKeepsOCSPAndSCT(t *testing.T) { + // This should be rechecked after upgrading to Go 1.20 or later. + // go1.19.13/src/crypto/tls/handshake_test.go:testRSACertificateIssuer has expired. + t.Skip("Skipping test that uses predefined certificate that expired in Jan 1st 2025") +} diff --git a/compiler/natives/src/crypto/x509/name_constraints_test.go b/compiler/natives/src/crypto/x509/name_constraints_test.go new file mode 100644 index 000000000..9b1190a6d --- /dev/null +++ b/compiler/natives/src/crypto/x509/name_constraints_test.go @@ -0,0 +1,16 @@ +//go:build js + +package x509 + +import "testing" + +//gopherjs:keep-original +func TestConstraintCases(t *testing.T) { + if testing.Short() { + // These tests are slow under GopherJS. Since GopherJS doesn't touch + // business logic behind them, there's little value in running them all. + // Instead, in the short mode we just just the first few as a smoke test. + nameConstraintsTests = nameConstraintsTests[0:5] + } + _gopherjs_original_TestConstraintCases(t) +} diff --git a/compiler/natives/src/crypto/x509/x509.go b/compiler/natives/src/crypto/x509/x509.go deleted file mode 100644 index a0391f751..000000000 --- a/compiler/natives/src/crypto/x509/x509.go +++ /dev/null @@ -1,9 +0,0 @@ -// +build js - -package x509 - -import "errors" - -func loadSystemRoots() (*CertPool, error) { - return nil, errors.New("crypto/x509: system root pool is not available in GopherJS") -} diff --git a/compiler/natives/src/crypto/x509/x509_test.go b/compiler/natives/src/crypto/x509/x509_test.go deleted file mode 100644 index 7a99c3882..000000000 --- a/compiler/natives/src/crypto/x509/x509_test.go +++ /dev/null @@ -1,25 +0,0 @@ -// +build js - -package x509 - -import "testing" - -func TestSystemCertPool(t *testing.T) { - t.Skip("no system roots") -} - -func TestSystemRoots(t *testing.T) { - t.Skip("no system roots") -} - -func TestEnvVars(t *testing.T) { - t.Skip("no system roots") -} - -func TestSystemVerify(t *testing.T) { - t.Skip("no system") -} - -func TestImports(t *testing.T) { - t.Skip("no system") -} diff --git a/compiler/natives/src/database/sql/driver/driver_test.go b/compiler/natives/src/database/sql/driver/driver_test.go index c52960c45..446da47c5 100644 --- a/compiler/natives/src/database/sql/driver/driver_test.go +++ b/compiler/natives/src/database/sql/driver/driver_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package driver diff --git a/compiler/natives/src/debug/elf/elf_test.go b/compiler/natives/src/debug/elf/elf_test.go deleted file mode 100644 index 4c636e40a..000000000 --- a/compiler/natives/src/debug/elf/elf_test.go +++ /dev/null @@ -1,9 +0,0 @@ -// +build js - -package elf - -import "testing" - -func TestNoSectionOverlaps(t *testing.T) { - t.Skip("not 6l") -} diff --git a/compiler/natives/src/debug/pe/symbol.go b/compiler/natives/src/debug/pe/symbol.go new file mode 100644 index 000000000..798502ce3 --- /dev/null +++ b/compiler/natives/src/debug/pe/symbol.go @@ -0,0 +1,119 @@ +//go:build js +// +build js + +package pe + +import ( + "encoding/binary" + "fmt" + "io" +) + +// bytesBufferLite is a simplified bytes.Buffer to avoid +// including `bytes` as a new import into the pe package. +type bytesBufferLite struct { + data []byte + off int +} + +func (buf *bytesBufferLite) Write(p []byte) (int, error) { + buf.data = append(buf.data, p...) + return len(p), nil +} + +func (buf *bytesBufferLite) Read(p []byte) (int, error) { + n := copy(p, buf.data[buf.off:]) + buf.off += n + return n, nil +} + +func copyToAuxFormat5(sym *COFFSymbol) (*COFFSymbolAuxFormat5, error) { + buf := &bytesBufferLite{data: make([]byte, 0, 20)} + if err := binary.Write(buf, binary.LittleEndian, sym); err != nil { + return nil, err + } + aux := &COFFSymbolAuxFormat5{} + if err := binary.Read(buf, binary.LittleEndian, aux); err != nil { + return nil, err + } + return aux, nil +} + +func copyFromAuxFormat5(aux *COFFSymbolAuxFormat5) (*COFFSymbol, error) { + buf := &bytesBufferLite{data: make([]byte, 0, 20)} + if err := binary.Write(buf, binary.LittleEndian, aux); err != nil { + return nil, err + } + sym := &COFFSymbol{} + if err := binary.Read(buf, binary.LittleEndian, sym); err != nil { + return nil, err + } + return sym, nil +} + +func readCOFFSymbols(fh *FileHeader, r io.ReadSeeker) ([]COFFSymbol, error) { + if fh.PointerToSymbolTable == 0 { + return nil, nil + } + if fh.NumberOfSymbols <= 0 { + return nil, nil + } + _, err := r.Seek(int64(fh.PointerToSymbolTable), seekStart) + if err != nil { + return nil, fmt.Errorf("fail to seek to symbol table: %v", err) + } + syms := make([]COFFSymbol, fh.NumberOfSymbols) + naux := 0 + for k := range syms { + if naux == 0 { + err = binary.Read(r, binary.LittleEndian, &syms[k]) + if err != nil { + return nil, fmt.Errorf("fail to read symbol table: %v", err) + } + naux = int(syms[k].NumberOfAuxSymbols) + } else { + naux-- + // The following was reading into one struct with the same memory + // footprint as another struck. This doesn't work in JS so the + // `syms` value is left with a bunch of defaults. So replace + // aux := (*COFFSymbolAuxFormat5)(unsafe.Pointer(&syms[k])) + // (an in memory remap) with the following read and then copy. + aux := &COFFSymbolAuxFormat5{} + err = binary.Read(r, binary.LittleEndian, aux) + if err != nil { + return nil, fmt.Errorf("fail to read symbol table: %v", err) + } + pesymn, err := copyFromAuxFormat5(aux) + if err != nil { + return nil, err + } + syms[k] = *pesymn + } + } + if naux != 0 { + return nil, fmt.Errorf("fail to read symbol table: %d aux symbols unread", naux) + } + return syms, nil +} + +func (f *File) COFFSymbolReadSectionDefAux(idx int) (*COFFSymbolAuxFormat5, error) { + var rv *COFFSymbolAuxFormat5 + if idx < 0 || idx >= len(f.COFFSymbols) { + return rv, fmt.Errorf("invalid symbol index") + } + pesym := &f.COFFSymbols[idx] + const IMAGE_SYM_CLASS_STATIC = 3 + if pesym.StorageClass != uint8(IMAGE_SYM_CLASS_STATIC) { + return rv, fmt.Errorf("incorrect symbol storage class") + } + if pesym.NumberOfAuxSymbols == 0 || idx+1 >= len(f.COFFSymbols) { + return rv, fmt.Errorf("aux symbol unavailable") + } + pesymn := &f.COFFSymbols[idx+1] + // The following was reading one struct as another struct with + // the same memory footprint. This doesn't work in JS so the + // `rv` value is left with a bunch of `undefined`s. So replace + // rv = (*COFFSymbolAuxFormat5)(unsafe.Pointer(pesymn)) + // (an in memory remap) with the following copy. + return copyToAuxFormat5(pesymn) +} diff --git a/compiler/natives/src/embed/embed.go b/compiler/natives/src/embed/embed.go new file mode 100644 index 000000000..bb9738546 --- /dev/null +++ b/compiler/natives/src/embed/embed.go @@ -0,0 +1,21 @@ +//go:build js +// +build js + +package embed + +func buildFS(list []struct { + name string + data string + hash [16]byte +}, +) (f FS) { + n := len(list) + files := make([]file, n) + for i := 0; i < n; i++ { + files[i].name = list[i].name + files[i].data = list[i].data + files[i].hash = list[i].hash + } + f.files = &files + return +} diff --git a/compiler/natives/src/encoding/gob/gob_test.go b/compiler/natives/src/encoding/gob/gob_test.go index b105e4f3b..823b572ac 100644 --- a/compiler/natives/src/encoding/gob/gob_test.go +++ b/compiler/natives/src/encoding/gob/gob_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package gob @@ -60,14 +61,14 @@ func TestEndToEnd(t *testing.T) { B: 18, C: -5, M: map[string]*float64{"pi": &pi, "e": &e}, - M2: map[int]T3{4: T3{X: pi, Z: &meaning}, 10: T3{X: e, Z: &fingers}}, + M2: map[int]T3{4: {X: pi, Z: &meaning}, 10: {X: e, Z: &fingers}}, Mstring: map[string]string{"pi": "3.14", "e": "2.71"}, Mintptr: map[int]*int{meaning: &fingers, fingers: &meaning}, Mcomp: map[complex128]complex128{comp1: comp2, comp2: comp1}, // TODO: Fix this problem: // TypeError: dst.$set is not a function // at typedmemmove (/github.com/gopherjs/gopherjs/reflect.go:487:3) - //Marr: map[[2]string][2]*float64{arr1: floatArr1, arr2: floatArr2}, + // Marr: map[[2]string][2]*float64{arr1: floatArr1, arr2: floatArr2}, EmptyMap: make(map[string]int), N: &[3]float64{1.5, 2.5, 3.5}, Strs: &[2]string{s1, s2}, diff --git a/compiler/natives/src/encoding/json/stream_test.go b/compiler/natives/src/encoding/json/stream_test.go index 7e6f37a05..adad8e153 100644 --- a/compiler/natives/src/encoding/json/stream_test.go +++ b/compiler/natives/src/encoding/json/stream_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package json diff --git a/compiler/natives/src/fmt/fmt_test.go b/compiler/natives/src/fmt/fmt_test.go index 65b000269..70797693b 100644 --- a/compiler/natives/src/fmt/fmt_test.go +++ b/compiler/natives/src/fmt/fmt_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package fmt_test diff --git a/compiler/natives/src/go/doc/doc_test.go b/compiler/natives/src/go/doc/doc_test.go new file mode 100644 index 000000000..4d35e880c --- /dev/null +++ b/compiler/natives/src/go/doc/doc_test.go @@ -0,0 +1,37 @@ +//go:build js + +package doc + +import ( + "fmt" + "testing" +) + +func compareSlices(t *testing.T, name string, got, want interface{}, compareElem interface{}) { + // TODO(nevkontakte): Remove this override after generics are supported. + // https://github.com/gopherjs/gopherjs/issues/1013. + switch got.(type) { + case []*Func: + got := got.([]*Func) + want := want.([]*Func) + compareElem := compareElem.(func(t *testing.T, msg string, got, want *Func)) + if len(got) != len(want) { + t.Errorf("%s: got %d, want %d", name, len(got), len(want)) + } + for i := 0; i < len(got) && i < len(want); i++ { + compareElem(t, fmt.Sprintf("%s[%d]", name, i), got[i], want[i]) + } + case []*Type: + got := got.([]*Type) + want := want.([]*Type) + compareElem := compareElem.(func(t *testing.T, msg string, got, want *Type)) + if len(got) != len(want) { + t.Errorf("%s: got %d, want %d", name, len(got), len(want)) + } + for i := 0; i < len(got) && i < len(want); i++ { + compareElem(t, fmt.Sprintf("%s[%d]", name, i), got[i], want[i]) + } + default: + t.Errorf("unexpected argument type %T", got) + } +} diff --git a/compiler/natives/src/go/parser/parser_test.go b/compiler/natives/src/go/parser/parser_test.go new file mode 100644 index 000000000..7fded29fd --- /dev/null +++ b/compiler/natives/src/go/parser/parser_test.go @@ -0,0 +1,11 @@ +//go:build js + +package parser + +import ( + "testing" +) + +func TestParseDepthLimit(t *testing.T) { + t.Skip("causes call stack exhaustion on js/ecmascript") +} diff --git a/compiler/natives/src/go/token/position.go b/compiler/natives/src/go/token/position.go new file mode 100644 index 000000000..6a1ee0c15 --- /dev/null +++ b/compiler/natives/src/go/token/position.go @@ -0,0 +1,22 @@ +//go:build js +// +build js + +package token + +import "sync" + +type FileSet struct { + mutex sync.RWMutex + base int + files []*File + + // replaced atomic.Pointer[File] for go1.19 without generics. + last atomicFilePointer +} + +type atomicFilePointer struct { + v *File +} + +func (x *atomicFilePointer) Load() *File { return x.v } +func (x *atomicFilePointer) Store(val *File) { x.v = val } diff --git a/compiler/natives/src/go/token/token_test.go b/compiler/natives/src/go/token/token_test.go index f975308de..335ee0776 100644 --- a/compiler/natives/src/go/token/token_test.go +++ b/compiler/natives/src/go/token/token_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package token diff --git a/compiler/natives/src/golang.org/x/crypto/internal/alias/alias.go b/compiler/natives/src/golang.org/x/crypto/internal/alias/alias.go new file mode 100644 index 000000000..a3e1e7f79 --- /dev/null +++ b/compiler/natives/src/golang.org/x/crypto/internal/alias/alias.go @@ -0,0 +1,21 @@ +//go:build js +// +build js + +package alias + +// This file duplicated is these two locations: +// - src/crypto/internal/subtle/aliasing.go +// - src/golang.org/x/crypto/internal/subtle/aliasing.go +// - src/golang.org/x/crypto/internal/alias/alias.go + +import "github.com/gopherjs/gopherjs/js" + +// AnyOverlap reports whether x and y share memory at any (not necessarily +// corresponding) index. The memory beyond the slice length is ignored. +func AnyOverlap(x, y []byte) bool { + // GopherJS: We can't rely on pointer arithmetic, so use GopherJS slice internals. + return len(x) > 0 && len(y) > 0 && + js.InternalObject(x).Get("$array") == js.InternalObject(y).Get("$array") && + js.InternalObject(x).Get("$offset").Int() <= js.InternalObject(y).Get("$offset").Int()+len(y)-1 && + js.InternalObject(y).Get("$offset").Int() <= js.InternalObject(x).Get("$offset").Int()+len(x)-1 +} diff --git a/compiler/natives/src/golang.org/x/crypto/internal/subtle/aliasing.go b/compiler/natives/src/golang.org/x/crypto/internal/subtle/aliasing.go new file mode 100644 index 000000000..145687d59 --- /dev/null +++ b/compiler/natives/src/golang.org/x/crypto/internal/subtle/aliasing.go @@ -0,0 +1,21 @@ +//go:build js +// +build js + +package subtle + +// This file duplicated is these two locations: +// - src/crypto/internal/subtle/aliasing.go +// - src/golang.org/x/crypto/internal/subtle/aliasing.go +// - src/golang.org/x/crypto/internal/alias/alias.go + +import "github.com/gopherjs/gopherjs/js" + +// AnyOverlap reports whether x and y share memory at any (not necessarily +// corresponding) index. The memory beyond the slice length is ignored. +func AnyOverlap(x, y []byte) bool { + // GopherJS: We can't rely on pointer arithmetic, so use GopherJS slice internals. + return len(x) > 0 && len(y) > 0 && + js.InternalObject(x).Get("$array") == js.InternalObject(y).Get("$array") && + js.InternalObject(x).Get("$offset").Int() <= js.InternalObject(y).Get("$offset").Int()+len(y)-1 && + js.InternalObject(y).Get("$offset").Int() <= js.InternalObject(x).Get("$offset").Int()+len(x)-1 +} diff --git a/compiler/natives/src/hash/maphash/maphash.go b/compiler/natives/src/hash/maphash/maphash.go new file mode 100644 index 000000000..5c982404f --- /dev/null +++ b/compiler/natives/src/hash/maphash/maphash.go @@ -0,0 +1,166 @@ +//go:build js +// +build js + +package maphash + +import ( + _ "unsafe" // for linkname +) + +// hashkey is similar how it is defined in runtime/alg.go for Go 1.19 +// to be used in hash{32,64}.go to seed the hash function as part of +// runtime_memhash. We're using locally defined memhash so it got moved here. +var hashkey [3]uint32 + +func init() { + for i := range hashkey { + hashkey[i] = runtime_fastrand() | 1 + // The `| 1` is to make sure these numbers are odd + } +} + +//go:linkname runtime_fastrand runtime.fastrand +func runtime_fastrand() uint32 + +// Bytes uses less efficient equivalent to avoid using unsafe. +func Bytes(seed Seed, b []byte) uint64 { + var h Hash + h.SetSeed(seed) + _, _ = h.Write(b) + return h.Sum64() +} + +// String uses less efficient equivalent to avoid using unsafe. +func String(seed Seed, s string) uint64 { + var h Hash + h.SetSeed(seed) + _, _ = h.WriteString(s) + return h.Sum64() +} + +// rthash is similar to the Go 1.19.13 version +// with the call to memhash changed to not use unsafe pointers. +func rthash(b []byte, seed uint64) uint64 { + if len(b) == 0 { + return seed + } + // The runtime hasher only works on uintptr. Since GopherJS implements a + // 32-bit environment, we use two parallel hashers on the lower and upper 32 + // bits. + lo := memhash(b, uint32(seed)) + hi := memhash(b, uint32(seed>>32)) + return uint64(hi)<<32 | uint64(lo) +} + +//gopherjs:purge to remove link using unsafe pointers, use memhash instead. +func runtime_memhash() + +// The implementation below is adapted from the upstream runtime/hash32.go +// and avoids use of unsafe, which GopherJS doesn't support well and leads to +// worse performance. +// +// Note that this hashing function is not actually used by GopherJS maps, since +// we use JS maps instead, but it may be still applicable for use with custom +// map types. +// +// Hashing algorithm inspired by wyhash: +// https://github.com/wangyi-fudan/wyhash/blob/ceb019b530e2c1c14d70b79bfa2bc49de7d95bc1/Modern%20Non-Cryptographic%20Hash%20Function%20and%20Pseudorandom%20Number%20Generator.pdf +func memhash(p []byte, seed uint32) uintptr { + s := len(p) + a, b := mix32(uint32(seed), uint32(s)^hashkey[0]) + if s == 0 { + return uintptr(a ^ b) + } + for ; s > 8; s -= 8 { + a ^= readUnaligned32(p) + b ^= readUnaligned32(add(p, 4)) + a, b = mix32(a, b) + p = add(p, 8) + } + if s >= 4 { + a ^= readUnaligned32(p) + b ^= readUnaligned32(add(p, s-4)) + } else { + t := uint32(p[0]) + t |= uint32(add(p, s>>1)[0]) << 8 + t |= uint32(add(p, s-1)[0]) << 16 + b ^= t + } + a, b = mix32(a, b) + a, b = mix32(a, b) + return uintptr(a ^ b) +} + +func add(p []byte, x int) []byte { + return p[x:] +} + +// Note: These routines perform the read in little endian. +func readUnaligned32(p []byte) uint32 { + return uint32(p[0]) | uint32(p[1])<<8 | uint32(p[2])<<16 | uint32(p[3])<<24 +} + +func mix32(a, b uint32) (uint32, uint32) { + c := uint64(a^uint32(hashkey[1])) * uint64(b^uint32(hashkey[2])) + return uint32(c), uint32(c >> 32) +} + +/* + The following functions were modified in Go 1.17 to improve performance, + but at the expense of being unsafe, and thus incompatible with GopherJS. + See https://cs.opensource.google/go/go/+/refs/tags/go1.19.13:src/hash/maphash/maphash.go; + To compensate, we use a simplified version of each method from Go 1.19.13, + similar to Go 1.16's versions, with the call to rthash changed to not use unsafe pointers. + + See upstream issue https://github.com/golang/go/issues/47342 to implement + a purego version of this package, which should render this hack (and + likely this entire file) obsolete. +*/ + +// Write is a simplification from Go 1.19 changed to not use unsafe. +func (h *Hash) Write(b []byte) (int, error) { + size := len(b) + if h.n+len(b) > bufSize { + h.initSeed() + for h.n+len(b) > bufSize { + k := copy(h.buf[h.n:], b) + h.state.s = rthash(h.buf[:], h.state.s) + b = b[k:] + h.n = 0 + } + } + h.n += copy(h.buf[h.n:], b) + return size, nil +} + +// WriteString is a simplification from Go 1.19 changed to not use unsafe. +func (h *Hash) WriteString(s string) (int, error) { + size := len(s) + if h.n+len(s) > bufSize { + h.initSeed() + for h.n+len(s) > bufSize { + k := copy(h.buf[h.n:], s) + h.state.s = rthash(h.buf[:], h.state.s) + s = s[k:] + h.n = 0 + } + } + h.n += copy(h.buf[h.n:], s) + return size, nil +} + +// flush is the Go 1.19 version changed to not use unsafe. +func (h *Hash) flush() { + if h.n != len(h.buf) { + panic("maphash: flush of partially full buffer") + } + h.initSeed() + h.state.s = rthash(h.buf[:], h.state.s) + h.n = 0 +} + +// Sum64 is the Go 1.19 version changed to not use unsafe. +func (h *Hash) Sum64() uint64 { + h.initSeed() + return rthash(h.buf[:h.n], h.state.s) +} diff --git a/compiler/natives/src/image/gif/fuzz_test.go b/compiler/natives/src/image/gif/fuzz_test.go new file mode 100644 index 000000000..b79977bfc --- /dev/null +++ b/compiler/natives/src/image/gif/fuzz_test.go @@ -0,0 +1,14 @@ +//go:build js + +package gif + +import "testing" + +//gopherjs:keep-original +func FuzzDecode(t *testing.F) { + if testing.Short() { + t.Skip("FuzzDecode is slow, skipping in the short mode.") + } + + _gopherjs_original_FuzzDecode(t) +} diff --git a/compiler/natives/src/internal/bytealg/bytealg.go b/compiler/natives/src/internal/bytealg/bytealg.go index 13d4ddd0c..dbcc6dec4 100644 --- a/compiler/natives/src/internal/bytealg/bytealg.go +++ b/compiler/natives/src/internal/bytealg/bytealg.go @@ -1,3 +1,4 @@ +//go:build js // +build js package bytealg @@ -13,3 +14,21 @@ func Equal(a, b []byte) bool { } return true } + +func IndexByte(b []byte, c byte) int { + for i, x := range b { + if x == c { + return i + } + } + return -1 +} + +func IndexByteString(s string, c byte) int { + for i := 0; i < len(s); i++ { + if s[i] == c { + return i + } + } + return -1 +} diff --git a/compiler/natives/src/internal/cpu/cpu.go b/compiler/natives/src/internal/cpu/cpu.go index 7777d3ae2..794a58d6a 100644 --- a/compiler/natives/src/internal/cpu/cpu.go +++ b/compiler/natives/src/internal/cpu/cpu.go @@ -1,3 +1,4 @@ +//go:build js // +build js package cpu @@ -6,3 +7,5 @@ const ( CacheLineSize = 0 CacheLinePadSize = 0 ) + +func doinit() {} diff --git a/compiler/natives/src/internal/fmtsort/fmtsort_test.go b/compiler/natives/src/internal/fmtsort/fmtsort_test.go index a3ceb7608..f45987d72 100644 --- a/compiler/natives/src/internal/fmtsort/fmtsort_test.go +++ b/compiler/natives/src/internal/fmtsort/fmtsort_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package fmtsort_test @@ -13,7 +14,7 @@ import ( // needsSkip reports whether the kind doesn't work for sorting on GopherJS. func needsSkip(k reflect.Kind) bool { switch k { - case reflect.Ptr, reflect.Chan: + case reflect.Ptr, reflect.Chan, reflect.UnsafePointer: return true } return false diff --git a/compiler/natives/src/internal/goarch/goarch_js.go b/compiler/natives/src/internal/goarch/goarch_js.go new file mode 100644 index 000000000..98618d698 --- /dev/null +++ b/compiler/natives/src/internal/goarch/goarch_js.go @@ -0,0 +1,13 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package goarch + +const ( + _ArchFamily = WASM + _DefaultPhysPageSize = 65536 + _PCQuantum = 1 + _MinFrameSize = 0 + _StackAlign = PtrSize +) diff --git a/compiler/natives/src/internal/goarch/zgoarch_js.go b/compiler/natives/src/internal/goarch/zgoarch_js.go new file mode 100644 index 000000000..0d2f87553 --- /dev/null +++ b/compiler/natives/src/internal/goarch/zgoarch_js.go @@ -0,0 +1,32 @@ +// Code generated by gengoarch.go using 'go generate'. DO NOT EDIT. + +//go:build js + +package goarch + +const GOARCH = `wasm` + +const Is386 = 0 +const IsAmd64 = 0 +const IsAmd64p32 = 0 +const IsArm = 0 +const IsArmbe = 0 +const IsArm64 = 0 +const IsArm64be = 0 +const IsLoong64 = 0 +const IsMips = 0 +const IsMipsle = 0 +const IsMips64 = 0 +const IsMips64le = 0 +const IsMips64p32 = 0 +const IsMips64p32le = 0 +const IsPpc = 0 +const IsPpc64 = 0 +const IsPpc64le = 0 +const IsRiscv = 0 +const IsRiscv64 = 0 +const IsS390 = 0 +const IsS390x = 0 +const IsSparc = 0 +const IsSparc64 = 0 +const IsWasm = 1 diff --git a/compiler/natives/src/internal/intern/intern.go b/compiler/natives/src/internal/intern/intern.go new file mode 100644 index 000000000..077b99aa3 --- /dev/null +++ b/compiler/natives/src/internal/intern/intern.go @@ -0,0 +1,29 @@ +//go:build js + +package intern + +var ( + eth0 = &Value{cmpVal: "eth0"} + eth1 = &Value{cmpVal: "eth1"} +) + +func get(k key) *Value { + // Interning implementation in this package unavoidably relies upon + // runtime.SetFinalizer(), which GopherJS doesn't support (at least until it + // is considered safe to use the WeakMap API). Without working finalizers + // using this package would create memory leaks. + // + // Considering that this package is supposed to serve as an optimization tool, + // it is better to make it explicitly unusable and work around it at the call + // sites. + + // net/netip tests use intern API with a few fixed values. It is easier to + // special-case them here than to override the entire test set. + if k.isString && k.s == "eth0" { + return eth0 + } else if k.isString && k.s == "eth1" { + return eth1 + } + + panic("internal/intern is not supported by GopherJS") +} diff --git a/compiler/natives/src/internal/poll/fd_poll.go b/compiler/natives/src/internal/poll/fd_poll.go deleted file mode 100644 index 5690f9fe8..000000000 --- a/compiler/natives/src/internal/poll/fd_poll.go +++ /dev/null @@ -1,88 +0,0 @@ -// +build js - -package poll - -import "time" - -// pollDesc is a no-op implementation of an I/O poller for GOARCH=js. -// -// Its implementation is based on NaCL in gc compiler (see GOROOT/src/internal/poll/fd_poll_nacl.go), -// but it does even less. -type pollDesc struct { - closing bool -} - -func (pd *pollDesc) init(fd *FD) error { return nil } - -func (pd *pollDesc) close() {} - -func (pd *pollDesc) evict() { pd.closing = true } - -func (pd *pollDesc) prepare(mode int, isFile bool) error { - if pd.closing { - return errClosing(isFile) - } - return nil -} - -func (pd *pollDesc) prepareRead(isFile bool) error { return pd.prepare('r', isFile) } - -func (pd *pollDesc) prepareWrite(isFile bool) error { return pd.prepare('w', isFile) } - -func (pd *pollDesc) wait(mode int, isFile bool) error { - if pd.closing { - return errClosing(isFile) - } - return ErrTimeout -} - -func (pd *pollDesc) waitRead(isFile bool) error { return pd.wait('r', isFile) } - -func (pd *pollDesc) waitWrite(isFile bool) error { return pd.wait('w', isFile) } - -func (*pollDesc) waitCanceled(mode int) {} - -func (*pollDesc) pollable() bool { return true } - -func (*FD) SetDeadline(t time.Time) error { return nil } - -func (*FD) SetReadDeadline(t time.Time) error { return nil } - -func (*FD) SetWriteDeadline(t time.Time) error { return nil } - -// PollDescriptor returns the descriptor being used by the poller, -// or ^uintptr(0) if there isn't one. This is only used for testing. -func PollDescriptor() uintptr { - return ^uintptr(0) -} - -// Copy of sync.runtime_Semacquire. -func runtime_Semacquire(s *uint32) { - if *s == 0 { - ch := make(chan bool) - semWaiters[s] = append(semWaiters[s], ch) - <-ch - } - *s-- -} - -// Copy of sync.runtime_Semrelease. -func runtime_Semrelease(s *uint32) { - *s++ - - w := semWaiters[s] - if len(w) == 0 { - return - } - - ch := w[0] - w = w[1:] - semWaiters[s] = w - if len(w) == 0 { - delete(semWaiters, s) - } - - ch <- true -} - -var semWaiters = make(map[*uint32][]chan bool) diff --git a/compiler/natives/src/internal/poll/semaphore.go b/compiler/natives/src/internal/poll/semaphore.go new file mode 100644 index 000000000..5e4f5ea8d --- /dev/null +++ b/compiler/natives/src/internal/poll/semaphore.go @@ -0,0 +1,14 @@ +//go:build js +// +build js + +package poll + +import ( + _ "unsafe" // For go:linkname +) + +//go:linkname runtime_Semacquire sync.runtime_Semacquire +func runtime_Semacquire(s *uint32) + +//go:linkname runtime_Semrelease sync.runtime_Semrelease +func runtime_Semrelease(s *uint32) diff --git a/compiler/natives/src/internal/reflectlite/all_test.go b/compiler/natives/src/internal/reflectlite/all_test.go new file mode 100644 index 000000000..4445189a0 --- /dev/null +++ b/compiler/natives/src/internal/reflectlite/all_test.go @@ -0,0 +1,47 @@ +//go:build js +// +build js + +package reflectlite_test + +import ( + "testing" + + . "internal/reflectlite" +) + +func TestTypes(t *testing.T) { + for i, tt := range typeTests { + if i == 30 { + continue + } + testReflectType(t, i, Field(ValueOf(tt.i), 0).Type(), tt.s) + } +} + +func TestNameBytesAreAligned(t *testing.T) { + t.Skip("TestNameBytesAreAligned") +} + +// `A` is used with `B[T any]` and is otherwise not needed. +// +//gopherjs:purge for go1.19 without generics +type ( + A struct{} + B[T any] struct{} +) + +// removing the name tests using `B[T any]` for go1.19 without generics +var nameTests = []nameTest{ + {(*int32)(nil), "int32"}, + {(*D1)(nil), "D1"}, + {(*[]D1)(nil), ""}, + {(*chan D1)(nil), ""}, + {(*func() D1)(nil), ""}, + {(*<-chan D1)(nil), ""}, + {(*chan<- D1)(nil), ""}, + {(*any)(nil), ""}, + {(*interface { + F() + })(nil), ""}, + {(*TheNameOfThisTypeIsExactly255BytesLongSoWhenTheCompilerPrependsTheReflectTestPackageNameAndExtraStarTheLinkerRuntimeAndReflectPackagesWillHaveToCorrectlyDecodeTheSecondLengthByte0123456789_0123456789_0123456789_0123456789_0123456789_012345678)(nil), "TheNameOfThisTypeIsExactly255BytesLongSoWhenTheCompilerPrependsTheReflectTestPackageNameAndExtraStarTheLinkerRuntimeAndReflectPackagesWillHaveToCorrectlyDecodeTheSecondLengthByte0123456789_0123456789_0123456789_0123456789_0123456789_012345678"}, +} diff --git a/compiler/natives/src/internal/reflectlite/export_test.go b/compiler/natives/src/internal/reflectlite/export_test.go new file mode 100644 index 000000000..d663e65ba --- /dev/null +++ b/compiler/natives/src/internal/reflectlite/export_test.go @@ -0,0 +1,35 @@ +//go:build js +// +build js + +package reflectlite + +import ( + "unsafe" +) + +// Field returns the i'th field of the struct v. +// It panics if v's Kind is not Struct or i is out of range. +func Field(v Value, i int) Value { + if v.kind() != Struct { + panic(&ValueError{"reflect.Value.Field", v.kind()}) + } + return v.Field(i) +} + +func TField(typ Type, i int) Type { + t := typ.(*rtype) + if t.Kind() != Struct { + panic("reflect: Field of non-struct type") + } + tt := (*structType)(unsafe.Pointer(t)) + return StructFieldType(tt, i) +} + +// Field returns the i'th struct field. +func StructFieldType(t *structType, i int) Type { + if i < 0 || i >= len(t.fields) { + panic("reflect: Field index out of bounds") + } + p := &t.fields[i] + return toType(p.typ) +} diff --git a/compiler/natives/src/internal/reflectlite/reflect_mirror_test.go b/compiler/natives/src/internal/reflectlite/reflect_mirror_test.go new file mode 100644 index 000000000..01504f582 --- /dev/null +++ b/compiler/natives/src/internal/reflectlite/reflect_mirror_test.go @@ -0,0 +1,12 @@ +//go:build js +// +build js + +package reflectlite_test + +import ( + "testing" +) + +func TestMirrorWithReflect(t *testing.T) { + t.Skip("TestMirrorWithReflect") +} diff --git a/compiler/natives/src/internal/reflectlite/reflectlite.go b/compiler/natives/src/internal/reflectlite/reflectlite.go new file mode 100644 index 000000000..d48f15987 --- /dev/null +++ b/compiler/natives/src/internal/reflectlite/reflectlite.go @@ -0,0 +1,965 @@ +//go:build js +// +build js + +package reflectlite + +import ( + "unsafe" + + "github.com/gopherjs/gopherjs/js" +) + +var initialized = false + +func init() { + // avoid dead code elimination + used := func(i interface{}) {} + used(rtype{}) + used(uncommonType{}) + used(method{}) + used(arrayType{}) + used(chanType{}) + used(funcType{}) + used(interfaceType{}) + used(mapType{}) + used(ptrType{}) + used(sliceType{}) + used(structType{}) + used(imethod{}) + used(structField{}) + + initialized = true + uint8Type = TypeOf(uint8(0)).(*rtype) // set for real +} + +var uint8Type *rtype + +var ( + idJsType = "_jsType" + idReflectType = "_reflectType" + idKindType = "kindType" + idRtype = "_rtype" +) + +func jsType(typ Type) *js.Object { + return js.InternalObject(typ).Get(idJsType) +} + +func reflectType(typ *js.Object) *rtype { + if typ.Get(idReflectType) == js.Undefined { + rt := &rtype{ + size: uintptr(typ.Get("size").Int()), + kind: uint8(typ.Get("kind").Int()), + str: newNameOff(newName(internalStr(typ.Get("string")), "", typ.Get("exported").Bool(), false)), + } + js.InternalObject(rt).Set(idJsType, typ) + typ.Set(idReflectType, js.InternalObject(rt)) + + methodSet := js.Global.Call("$methodSet", typ) + if methodSet.Length() != 0 || typ.Get("named").Bool() { + rt.tflag |= tflagUncommon + if typ.Get("named").Bool() { + rt.tflag |= tflagNamed + } + var reflectMethods []method + for i := 0; i < methodSet.Length(); i++ { // Exported methods first. + m := methodSet.Index(i) + exported := internalStr(m.Get("pkg")) == "" + if !exported { + continue + } + reflectMethods = append(reflectMethods, method{ + name: newNameOff(newName(internalStr(m.Get("name")), "", exported, false)), + mtyp: newTypeOff(reflectType(m.Get("typ"))), + }) + } + xcount := uint16(len(reflectMethods)) + for i := 0; i < methodSet.Length(); i++ { // Unexported methods second. + m := methodSet.Index(i) + exported := internalStr(m.Get("pkg")) == "" + if exported { + continue + } + reflectMethods = append(reflectMethods, method{ + name: newNameOff(newName(internalStr(m.Get("name")), "", exported, false)), + mtyp: newTypeOff(reflectType(m.Get("typ"))), + }) + } + ut := &uncommonType{ + pkgPath: newNameOff(newName(internalStr(typ.Get("pkg")), "", false, false)), + mcount: uint16(methodSet.Length()), + xcount: xcount, + _methods: reflectMethods, + } + uncommonTypeMap[rt] = ut + js.InternalObject(ut).Set(idJsType, typ) + } + + switch rt.Kind() { + case Array: + setKindType(rt, &arrayType{ + elem: reflectType(typ.Get("elem")), + len: uintptr(typ.Get("len").Int()), + }) + case Chan: + dir := BothDir + if typ.Get("sendOnly").Bool() { + dir = SendDir + } + if typ.Get("recvOnly").Bool() { + dir = RecvDir + } + setKindType(rt, &chanType{ + elem: reflectType(typ.Get("elem")), + dir: uintptr(dir), + }) + case Func: + params := typ.Get("params") + in := make([]*rtype, params.Length()) + for i := range in { + in[i] = reflectType(params.Index(i)) + } + results := typ.Get("results") + out := make([]*rtype, results.Length()) + for i := range out { + out[i] = reflectType(results.Index(i)) + } + outCount := uint16(results.Length()) + if typ.Get("variadic").Bool() { + outCount |= 1 << 15 + } + setKindType(rt, &funcType{ + rtype: *rt, + inCount: uint16(params.Length()), + outCount: outCount, + _in: in, + _out: out, + }) + case Interface: + methods := typ.Get("methods") + imethods := make([]imethod, methods.Length()) + for i := range imethods { + m := methods.Index(i) + imethods[i] = imethod{ + name: newNameOff(newName(internalStr(m.Get("name")), "", internalStr(m.Get("pkg")) == "", false)), + typ: newTypeOff(reflectType(m.Get("typ"))), + } + } + setKindType(rt, &interfaceType{ + rtype: *rt, + pkgPath: newName(internalStr(typ.Get("pkg")), "", false, false), + methods: imethods, + }) + case Map: + setKindType(rt, &mapType{ + key: reflectType(typ.Get("key")), + elem: reflectType(typ.Get("elem")), + }) + case Ptr: + setKindType(rt, &ptrType{ + elem: reflectType(typ.Get("elem")), + }) + case Slice: + setKindType(rt, &sliceType{ + elem: reflectType(typ.Get("elem")), + }) + case Struct: + fields := typ.Get("fields") + reflectFields := make([]structField, fields.Length()) + for i := range reflectFields { + f := fields.Index(i) + reflectFields[i] = structField{ + name: newName(internalStr(f.Get("name")), internalStr(f.Get("tag")), f.Get("exported").Bool(), f.Get("embedded").Bool()), + typ: reflectType(f.Get("typ")), + offset: uintptr(i), + } + } + setKindType(rt, &structType{ + rtype: *rt, + pkgPath: newName(internalStr(typ.Get("pkgPath")), "", false, false), + fields: reflectFields, + }) + } + } + + return (*rtype)(unsafe.Pointer(typ.Get(idReflectType).Unsafe())) +} + +func setKindType(rt *rtype, kindType interface{}) { + js.InternalObject(rt).Set(idKindType, js.InternalObject(kindType)) + js.InternalObject(kindType).Set(idRtype, js.InternalObject(rt)) +} + +type uncommonType struct { + pkgPath nameOff + mcount uint16 + xcount uint16 + moff uint32 + + _methods []method +} + +func (t *uncommonType) methods() []method { + return t._methods +} + +func (t *uncommonType) exportedMethods() []method { + return t._methods[:t.xcount:t.xcount] +} + +var uncommonTypeMap = make(map[*rtype]*uncommonType) + +func (t *rtype) uncommon() *uncommonType { + return uncommonTypeMap[t] +} + +type funcType struct { + rtype `reflect:"func"` + inCount uint16 + outCount uint16 + + _in []*rtype + _out []*rtype +} + +func (t *funcType) in() []*rtype { + return t._in +} + +func (t *funcType) out() []*rtype { + return t._out +} + +type name struct { + bytes *byte +} + +type nameData struct { + name string + tag string + exported bool + embedded bool +} + +var nameMap = make(map[*byte]*nameData) + +func (n name) name() (s string) { return nameMap[n.bytes].name } +func (n name) tag() (s string) { return nameMap[n.bytes].tag } +func (n name) pkgPath() string { return "" } +func (n name) isExported() bool { return nameMap[n.bytes].exported } +func (n name) embedded() bool { return nameMap[n.bytes].embedded } + +func newName(n, tag string, exported, embedded bool) name { + b := new(byte) + nameMap[b] = &nameData{ + name: n, + tag: tag, + exported: exported, + embedded: embedded, + } + return name{ + bytes: b, + } +} + +var nameOffList []name + +func (t *rtype) nameOff(off nameOff) name { + return nameOffList[int(off)] +} + +func newNameOff(n name) nameOff { + i := len(nameOffList) + nameOffList = append(nameOffList, n) + return nameOff(i) +} + +var typeOffList []*rtype + +func (t *rtype) typeOff(off typeOff) *rtype { + return typeOffList[int(off)] +} + +func newTypeOff(t *rtype) typeOff { + i := len(typeOffList) + typeOffList = append(typeOffList, t) + return typeOff(i) +} + +func internalStr(strObj *js.Object) string { + var c struct{ str string } + js.InternalObject(c).Set("str", strObj) // get string without internalizing + return c.str +} + +func isWrapped(typ Type) bool { + return jsType(typ).Get("wrapped").Bool() +} + +func copyStruct(dst, src *js.Object, typ Type) { + fields := jsType(typ).Get("fields") + for i := 0; i < fields.Length(); i++ { + prop := fields.Index(i).Get("prop").String() + dst.Set(prop, src.Get(prop)) + } +} + +func makeValue(t Type, v *js.Object, fl flag) Value { + rt := t.common() + if t.Kind() == Array || t.Kind() == Struct || t.Kind() == Ptr { + return Value{rt, unsafe.Pointer(v.Unsafe()), fl | flag(t.Kind())} + } + return Value{rt, unsafe.Pointer(js.Global.Call("$newDataPointer", v, jsType(rt.ptrTo())).Unsafe()), fl | flag(t.Kind()) | flagIndir} +} + +func MakeSlice(typ Type, len, cap int) Value { + if typ.Kind() != Slice { + panic("reflect.MakeSlice of non-slice type") + } + if len < 0 { + panic("reflect.MakeSlice: negative len") + } + if cap < 0 { + panic("reflect.MakeSlice: negative cap") + } + if len > cap { + panic("reflect.MakeSlice: len > cap") + } + + return makeValue(typ, js.Global.Call("$makeSlice", jsType(typ), len, cap, js.InternalObject(func() *js.Object { return jsType(typ.Elem()).Call("zero") })), 0) +} + +func TypeOf(i interface{}) Type { + if !initialized { // avoid error of uint8Type + return &rtype{} + } + if i == nil { + return nil + } + return reflectType(js.InternalObject(i).Get("constructor")) +} + +func ValueOf(i interface{}) Value { + if i == nil { + return Value{} + } + return makeValue(reflectType(js.InternalObject(i).Get("constructor")), js.InternalObject(i).Get("$val"), 0) +} + +func ArrayOf(count int, elem Type) Type { + return reflectType(js.Global.Call("$arrayType", jsType(elem), count)) +} + +func ChanOf(dir ChanDir, t Type) Type { + return reflectType(js.Global.Call("$chanType", jsType(t), dir == SendDir, dir == RecvDir)) +} + +func FuncOf(in, out []Type, variadic bool) Type { + if variadic && (len(in) == 0 || in[len(in)-1].Kind() != Slice) { + panic("reflect.FuncOf: last arg of variadic func must be slice") + } + + jsIn := make([]*js.Object, len(in)) + for i, v := range in { + jsIn[i] = jsType(v) + } + jsOut := make([]*js.Object, len(out)) + for i, v := range out { + jsOut[i] = jsType(v) + } + return reflectType(js.Global.Call("$funcType", jsIn, jsOut, variadic)) +} + +func MapOf(key, elem Type) Type { + switch key.Kind() { + case Func, Map, Slice: + panic("reflect.MapOf: invalid key type " + key.String()) + } + + return reflectType(js.Global.Call("$mapType", jsType(key), jsType(elem))) +} + +func (t *rtype) ptrTo() *rtype { + return reflectType(js.Global.Call("$ptrType", jsType(t))) +} + +func SliceOf(t Type) Type { + return reflectType(js.Global.Call("$sliceType", jsType(t))) +} + +func Zero(typ Type) Value { + return makeValue(typ, jsType(typ).Call("zero"), 0) +} + +func unsafe_New(typ *rtype) unsafe.Pointer { + switch typ.Kind() { + case Struct: + return unsafe.Pointer(jsType(typ).Get("ptr").New().Unsafe()) + case Array: + return unsafe.Pointer(jsType(typ).Call("zero").Unsafe()) + default: + return unsafe.Pointer(js.Global.Call("$newDataPointer", jsType(typ).Call("zero"), jsType(typ.ptrTo())).Unsafe()) + } +} + +func makeInt(f flag, bits uint64, t Type) Value { + typ := t.common() + ptr := unsafe_New(typ) + switch typ.Kind() { + case Int8: + *(*int8)(ptr) = int8(bits) + case Int16: + *(*int16)(ptr) = int16(bits) + case Int, Int32: + *(*int32)(ptr) = int32(bits) + case Int64: + *(*int64)(ptr) = int64(bits) + case Uint8: + *(*uint8)(ptr) = uint8(bits) + case Uint16: + *(*uint16)(ptr) = uint16(bits) + case Uint, Uint32, Uintptr: + *(*uint32)(ptr) = uint32(bits) + case Uint64: + *(*uint64)(ptr) = uint64(bits) + } + return Value{typ, ptr, f | flagIndir | flag(typ.Kind())} +} + +func MakeFunc(typ Type, fn func(args []Value) (results []Value)) Value { + if typ.Kind() != Func { + panic("reflect: call of MakeFunc with non-Func type") + } + + t := typ.common() + ftyp := (*funcType)(unsafe.Pointer(t)) + + fv := js.MakeFunc(func(this *js.Object, arguments []*js.Object) interface{} { + args := make([]Value, ftyp.NumIn()) + for i := range args { + argType := ftyp.In(i).common() + args[i] = makeValue(argType, arguments[i], 0) + } + resultsSlice := fn(args) + switch ftyp.NumOut() { + case 0: + return nil + case 1: + return resultsSlice[0].object() + default: + results := js.Global.Get("Array").New(ftyp.NumOut()) + for i, r := range resultsSlice { + results.SetIndex(i, r.object()) + } + return results + } + }) + + return Value{t, unsafe.Pointer(fv.Unsafe()), flag(Func)} +} + +func typedmemmove(t *rtype, dst, src unsafe.Pointer) { + js.InternalObject(dst).Call("$set", js.InternalObject(src).Call("$get")) +} + +func loadScalar(p unsafe.Pointer, n uintptr) uintptr { + return js.InternalObject(p).Call("$get").Unsafe() +} + +func makechan(typ *rtype, size int) (ch unsafe.Pointer) { + ctyp := (*chanType)(unsafe.Pointer(typ)) + return unsafe.Pointer(js.Global.Get("$Chan").New(jsType(ctyp.elem), size).Unsafe()) +} + +func makemap(t *rtype, cap int) (m unsafe.Pointer) { + return unsafe.Pointer(js.Global.Get("Map").New().Unsafe()) +} + +func keyFor(t *rtype, key unsafe.Pointer) (*js.Object, string) { + kv := js.InternalObject(key) + if kv.Get("$get") != js.Undefined { + kv = kv.Call("$get") + } + k := jsType(t.Key()).Call("keyFor", kv).String() + return kv, k +} + +func mapaccess(t *rtype, m, key unsafe.Pointer) unsafe.Pointer { + _, k := keyFor(t, key) + entry := js.InternalObject(m).Call("get", k) + if entry == js.Undefined { + return nil + } + return unsafe.Pointer(js.Global.Call("$newDataPointer", entry.Get("v"), jsType(PtrTo(t.Elem()))).Unsafe()) +} + +func mapassign(t *rtype, m, key, val unsafe.Pointer) { + kv, k := keyFor(t, key) + jsVal := js.InternalObject(val).Call("$get") + et := t.Elem() + if et.Kind() == Struct { + newVal := jsType(et).Call("zero") + copyStruct(newVal, jsVal, et) + jsVal = newVal + } + entry := js.Global.Get("Object").New() + entry.Set("k", kv) + entry.Set("v", jsVal) + js.InternalObject(m).Call("set", k, entry) +} + +func mapdelete(t *rtype, m unsafe.Pointer, key unsafe.Pointer) { + _, k := keyFor(t, key) + js.InternalObject(m).Call("delete", k) +} + +type mapIter struct { + t Type + m *js.Object + keys *js.Object + i int + + // last is the last object the iterator indicates. If this object exists, the functions that return the + // current key or value returns this object, regardless of the current iterator. It is because the current + // iterator might be stale due to key deletion in a loop. + last *js.Object +} + +func (iter *mapIter) skipUntilValidKey() { + for iter.i < iter.keys.Length() { + k := iter.keys.Index(iter.i) + if iter.m.Call("get", k) != js.Undefined { + break + } + // The key is already deleted. Move on the next item. + iter.i++ + } +} + +func mapiterinit(t *rtype, m unsafe.Pointer) unsafe.Pointer { + return unsafe.Pointer(&mapIter{t, js.InternalObject(m), js.Global.Get("Array").Call("from", js.InternalObject(m).Call("keys")), 0, nil}) +} + +type TypeEx interface { + Type + Key() Type +} + +func mapiterkey(it unsafe.Pointer) unsafe.Pointer { + iter := (*mapIter)(it) + var kv *js.Object + if iter.last != nil { + kv = iter.last + } else { + iter.skipUntilValidKey() + if iter.i == iter.keys.Length() { + return nil + } + k := iter.keys.Index(iter.i) + kv = iter.m.Call("get", k) + + // Record the key-value pair for later accesses. + iter.last = kv + } + return unsafe.Pointer(js.Global.Call("$newDataPointer", kv.Get("k"), jsType(PtrTo(iter.t.(TypeEx).Key()))).Unsafe()) +} + +func mapiternext(it unsafe.Pointer) { + iter := (*mapIter)(it) + iter.last = nil + iter.i++ +} + +func maplen(m unsafe.Pointer) int { + return js.InternalObject(m).Get("size").Int() +} + +func cvtDirect(v Value, typ Type) Value { + srcVal := v.object() + if srcVal == jsType(v.typ).Get("nil") { + return makeValue(typ, jsType(typ).Get("nil"), v.flag) + } + + var val *js.Object + switch k := typ.Kind(); k { + case Slice: + slice := jsType(typ).New(srcVal.Get("$array")) + slice.Set("$offset", srcVal.Get("$offset")) + slice.Set("$length", srcVal.Get("$length")) + slice.Set("$capacity", srcVal.Get("$capacity")) + val = js.Global.Call("$newDataPointer", slice, jsType(PtrTo(typ))) + case Ptr: + if typ.Elem().Kind() == Struct { + if typ.Elem() == v.typ.Elem() { + val = srcVal + break + } + val = jsType(typ).New() + copyStruct(val, srcVal, typ.Elem()) + break + } + val = jsType(typ).New(srcVal.Get("$get"), srcVal.Get("$set")) + case Struct: + val = jsType(typ).Get("ptr").New() + copyStruct(val, srcVal, typ) + case Array, Bool, Chan, Func, Interface, Map, String: + val = js.InternalObject(v.ptr) + default: + panic(&ValueError{"reflect.Convert", k}) + } + return Value{typ.common(), unsafe.Pointer(val.Unsafe()), v.flag.ro() | v.flag&flagIndir | flag(typ.Kind())} +} + +func Copy(dst, src Value) int { + dk := dst.kind() + if dk != Array && dk != Slice { + panic(&ValueError{"reflect.Copy", dk}) + } + if dk == Array { + dst.mustBeAssignable() + } + dst.mustBeExported() + + sk := src.kind() + var stringCopy bool + if sk != Array && sk != Slice { + stringCopy = sk == String && dst.typ.Elem().Kind() == Uint8 + if !stringCopy { + panic(&ValueError{"reflect.Copy", sk}) + } + } + src.mustBeExported() + + if !stringCopy { + typesMustMatch("reflect.Copy", dst.typ.Elem(), src.typ.Elem()) + } + + dstVal := dst.object() + if dk == Array { + dstVal = jsType(SliceOf(dst.typ.Elem())).New(dstVal) + } + + srcVal := src.object() + if sk == Array { + srcVal = jsType(SliceOf(src.typ.Elem())).New(srcVal) + } + + if stringCopy { + return js.Global.Call("$copyString", dstVal, srcVal).Int() + } + return js.Global.Call("$copySlice", dstVal, srcVal).Int() +} + +func methodReceiver(op string, v Value, i int) (_ *rtype, t *funcType, fn unsafe.Pointer) { + var prop string + if v.typ.Kind() == Interface { + tt := (*interfaceType)(unsafe.Pointer(v.typ)) + if i < 0 || i >= len(tt.methods) { + panic("reflect: internal error: invalid method index") + } + m := &tt.methods[i] + if !tt.nameOff(m.name).isExported() { + panic("reflect: " + op + " of unexported method") + } + t = (*funcType)(unsafe.Pointer(tt.typeOff(m.typ))) + prop = tt.nameOff(m.name).name() + } else { + ms := v.typ.exportedMethods() + if uint(i) >= uint(len(ms)) { + panic("reflect: internal error: invalid method index") + } + m := ms[i] + if !v.typ.nameOff(m.name).isExported() { + panic("reflect: " + op + " of unexported method") + } + t = (*funcType)(unsafe.Pointer(v.typ.typeOff(m.mtyp))) + prop = js.Global.Call("$methodSet", jsType(v.typ)).Index(i).Get("prop").String() + } + rcvr := v.object() + if isWrapped(v.typ) { + rcvr = jsType(v.typ).New(rcvr) + } + fn = unsafe.Pointer(rcvr.Get(prop).Unsafe()) + return +} + +func valueInterface(v Value) interface{} { + if v.flag == 0 { + panic(&ValueError{"reflect.Value.Interface", 0}) + } + + if v.flag&flagMethod != 0 { + v = makeMethodValue("Interface", v) + } + + if isWrapped(v.typ) { + if v.flag&flagIndir != 0 && v.Kind() == Struct { + cv := jsType(v.typ).Call("zero") + copyStruct(cv, v.object(), v.typ) + return interface{}(unsafe.Pointer(jsType(v.typ).New(cv).Unsafe())) + } + return interface{}(unsafe.Pointer(jsType(v.typ).New(v.object()).Unsafe())) + } + return interface{}(unsafe.Pointer(v.object().Unsafe())) +} + +func ifaceE2I(t *rtype, src interface{}, dst unsafe.Pointer) { + js.InternalObject(dst).Call("$set", js.InternalObject(src)) +} + +func methodName() string { + return "?FIXME?" +} + +func makeMethodValue(op string, v Value) Value { + if v.flag&flagMethod == 0 { + panic("reflect: internal error: invalid use of makePartialFunc") + } + + _, _, fn := methodReceiver(op, v, int(v.flag)>>flagMethodShift) + rcvr := v.object() + if isWrapped(v.typ) { + rcvr = jsType(v.typ).New(rcvr) + } + fv := js.MakeFunc(func(this *js.Object, arguments []*js.Object) interface{} { + return js.InternalObject(fn).Call("apply", rcvr, arguments) + }) + return Value{v.Type().common(), unsafe.Pointer(fv.Unsafe()), v.flag.ro() | flag(Func)} +} + +var jsObjectPtr = reflectType(js.Global.Get("$jsObjectPtr")) + +func wrapJsObject(typ Type, val *js.Object) *js.Object { + if typ == jsObjectPtr { + return jsType(jsObjectPtr).New(val) + } + return val +} + +func unwrapJsObject(typ Type, val *js.Object) *js.Object { + if typ == jsObjectPtr { + return val.Get("object") + } + return val +} + +func getJsTag(tag string) string { + for tag != "" { + // skip leading space + i := 0 + for i < len(tag) && tag[i] == ' ' { + i++ + } + tag = tag[i:] + if tag == "" { + break + } + + // scan to colon. + // a space or a quote is a syntax error + i = 0 + for i < len(tag) && tag[i] != ' ' && tag[i] != ':' && tag[i] != '"' { + i++ + } + if i+1 >= len(tag) || tag[i] != ':' || tag[i+1] != '"' { + break + } + name := string(tag[:i]) + tag = tag[i+1:] + + // scan quoted string to find value + i = 1 + for i < len(tag) && tag[i] != '"' { + if tag[i] == '\\' { + i++ + } + i++ + } + if i >= len(tag) { + break + } + qvalue := string(tag[:i+1]) + tag = tag[i+1:] + + if name == "js" { + value, _ := unquote(qvalue) + return value + } + } + return "" +} + +// PtrTo returns the pointer type with element t. +// For example, if t represents type Foo, PtrTo(t) represents *Foo. +func PtrTo(t Type) Type { + return t.(*rtype).ptrTo() +} + +// copyVal returns a Value containing the map key or value at ptr, +// allocating a new variable as needed. +func copyVal(typ *rtype, fl flag, ptr unsafe.Pointer) Value { + if ifaceIndir(typ) { + // Copy result so future changes to the map + // won't change the underlying value. + c := unsafe_New(typ) + typedmemmove(typ, c, ptr) + return Value{typ, c, fl | flagIndir} + } + return Value{typ, *(*unsafe.Pointer)(ptr), fl} +} + +var selectHelper = js.Global.Get("$select").Interface().(func(...interface{}) *js.Object) + +func chanrecv(ch unsafe.Pointer, nb bool, val unsafe.Pointer) (selected, received bool) { + comms := [][]*js.Object{{js.InternalObject(ch)}} + if nb { + comms = append(comms, []*js.Object{}) + } + selectRes := selectHelper(comms) + if nb && selectRes.Index(0).Int() == 1 { + return false, false + } + recvRes := selectRes.Index(1) + js.InternalObject(val).Call("$set", recvRes.Index(0)) + return true, recvRes.Index(1).Bool() +} + +func chansend(ch unsafe.Pointer, val unsafe.Pointer, nb bool) bool { + comms := [][]*js.Object{{js.InternalObject(ch), js.InternalObject(val).Call("$get")}} + if nb { + comms = append(comms, []*js.Object{}) + } + selectRes := selectHelper(comms) + if nb && selectRes.Index(0).Int() == 1 { + return false + } + return true +} + +func rselect(rselects []runtimeSelect) (chosen int, recvOK bool) { + comms := make([][]*js.Object, len(rselects)) + for i, s := range rselects { + switch SelectDir(s.dir) { + case SelectDefault: + comms[i] = []*js.Object{} + case SelectRecv: + ch := js.Global.Get("$chanNil") + if js.InternalObject(s.ch) != js.InternalObject(0) { + ch = js.InternalObject(s.ch) + } + comms[i] = []*js.Object{ch} + case SelectSend: + ch := js.Global.Get("$chanNil") + var val *js.Object + if js.InternalObject(s.ch) != js.InternalObject(0) { + ch = js.InternalObject(s.ch) + val = js.InternalObject(s.val).Call("$get") + } + comms[i] = []*js.Object{ch, val} + } + } + selectRes := selectHelper(comms) + c := selectRes.Index(0).Int() + if SelectDir(rselects[c].dir) == SelectRecv { + recvRes := selectRes.Index(1) + js.InternalObject(rselects[c].val).Call("$set", recvRes.Index(0)) + return c, recvRes.Index(1).Bool() + } + return c, false +} + +func DeepEqual(a1, a2 interface{}) bool { + i1 := js.InternalObject(a1) + i2 := js.InternalObject(a2) + if i1 == i2 { + return true + } + if i1 == nil || i2 == nil || i1.Get("constructor") != i2.Get("constructor") { + return false + } + return deepValueEqualJs(ValueOf(a1), ValueOf(a2), nil) +} + +func deepValueEqualJs(v1, v2 Value, visited [][2]unsafe.Pointer) bool { + if !v1.IsValid() || !v2.IsValid() { + return !v1.IsValid() && !v2.IsValid() + } + if v1.Type() != v2.Type() { + return false + } + if v1.Type() == jsObjectPtr { + return unwrapJsObject(jsObjectPtr, v1.object()) == unwrapJsObject(jsObjectPtr, v2.object()) + } + + switch v1.Kind() { + case Array, Map, Slice, Struct: + for _, entry := range visited { + if v1.ptr == entry[0] && v2.ptr == entry[1] { + return true + } + } + visited = append(visited, [2]unsafe.Pointer{v1.ptr, v2.ptr}) + } + + switch v1.Kind() { + case Array, Slice: + if v1.Kind() == Slice { + if v1.IsNil() != v2.IsNil() { + return false + } + if v1.object() == v2.object() { + return true + } + } + n := v1.Len() + if n != v2.Len() { + return false + } + for i := 0; i < n; i++ { + if !deepValueEqualJs(v1.Index(i), v2.Index(i), visited) { + return false + } + } + return true + case Interface: + if v1.IsNil() || v2.IsNil() { + return v1.IsNil() && v2.IsNil() + } + return deepValueEqualJs(v1.Elem(), v2.Elem(), visited) + case Ptr: + return deepValueEqualJs(v1.Elem(), v2.Elem(), visited) + case Struct: + n := v1.NumField() + for i := 0; i < n; i++ { + if !deepValueEqualJs(v1.Field(i), v2.Field(i), visited) { + return false + } + } + return true + case Map: + if v1.IsNil() != v2.IsNil() { + return false + } + if v1.object() == v2.object() { + return true + } + keys := v1.MapKeys() + if len(keys) != v2.Len() { + return false + } + for _, k := range keys { + val1 := v1.MapIndex(k) + val2 := v2.MapIndex(k) + if !val1.IsValid() || !val2.IsValid() || !deepValueEqualJs(val1, val2, visited) { + return false + } + } + return true + case Func: + return v1.IsNil() && v2.IsNil() + case UnsafePointer: + return v1.object() == v2.object() + } + + return js.Global.Call("$interfaceIsEqual", js.InternalObject(valueInterface(v1)), js.InternalObject(valueInterface(v2))).Bool() +} diff --git a/compiler/natives/src/internal/reflectlite/swapper.go b/compiler/natives/src/internal/reflectlite/swapper.go new file mode 100644 index 000000000..b8827c226 --- /dev/null +++ b/compiler/natives/src/internal/reflectlite/swapper.go @@ -0,0 +1,37 @@ +//go:build js +// +build js + +package reflectlite + +import "github.com/gopherjs/gopherjs/js" + +func Swapper(slice interface{}) func(i, j int) { + v := ValueOf(slice) + if v.Kind() != Slice { + panic(&ValueError{Method: "Swapper", Kind: v.Kind()}) + } + // Fast path for slices of size 0 and 1. Nothing to swap. + vLen := uint(v.Len()) + switch vLen { + case 0: + return func(i, j int) { panic("reflect: slice index out of range") } + case 1: + return func(i, j int) { + if i != 0 || j != 0 { + panic("reflect: slice index out of range") + } + } + } + a := js.InternalObject(slice).Get("$array") + off := js.InternalObject(slice).Get("$offset").Int() + return func(i, j int) { + if uint(i) >= vLen || uint(j) >= vLen { + panic("reflect: slice index out of range") + } + i += off + j += off + tmp := a.Index(i) + a.SetIndex(i, a.Index(j)) + a.SetIndex(j, tmp) + } +} diff --git a/compiler/natives/src/internal/reflectlite/type.go b/compiler/natives/src/internal/reflectlite/type.go new file mode 100644 index 000000000..0a41e862e --- /dev/null +++ b/compiler/natives/src/internal/reflectlite/type.go @@ -0,0 +1,103 @@ +//go:build js +// +build js + +package reflectlite + +import ( + "unsafe" + + "github.com/gopherjs/gopherjs/js" +) + +func (t *rtype) Comparable() bool { + switch t.Kind() { + case Func, Slice, Map: + return false + case Array: + return t.Elem().Comparable() + case Struct: + for i := 0; i < t.NumField(); i++ { + ft := t.Field(i) + if !ft.typ.Comparable() { + return false + } + } + } + return true +} + +func (t *rtype) IsVariadic() bool { + if t.Kind() != Func { + panic("reflect: IsVariadic of non-func type") + } + tt := (*funcType)(unsafe.Pointer(t)) + return tt.outCount&(1<<15) != 0 +} + +func (t *rtype) kindType() *rtype { + return (*rtype)(unsafe.Pointer(js.InternalObject(t).Get(idKindType))) +} + +func (t *rtype) Field(i int) structField { + if t.Kind() != Struct { + panic("reflect: Field of non-struct type") + } + tt := (*structType)(unsafe.Pointer(t)) + if i < 0 || i >= len(tt.fields) { + panic("reflect: Field index out of bounds") + } + return tt.fields[i] +} + +func (t *rtype) Key() Type { + if t.Kind() != Map { + panic("reflect: Key of non-map type") + } + tt := (*mapType)(unsafe.Pointer(t)) + return toType(tt.key) +} + +func (t *rtype) NumField() int { + if t.Kind() != Struct { + panic("reflect: NumField of non-struct type") + } + tt := (*structType)(unsafe.Pointer(t)) + return len(tt.fields) +} + +func (t *rtype) Method(i int) (m Method) { + if t.Kind() == Interface { + tt := (*interfaceType)(unsafe.Pointer(t)) + return tt.Method(i) + } + methods := t.exportedMethods() + if i < 0 || i >= len(methods) { + panic("reflect: Method index out of range") + } + p := methods[i] + pname := t.nameOff(p.name) + m.Name = pname.name() + fl := flag(Func) + mtyp := t.typeOff(p.mtyp) + ft := (*funcType)(unsafe.Pointer(mtyp)) + in := make([]Type, 0, 1+len(ft.in())) + in = append(in, t) + for _, arg := range ft.in() { + in = append(in, arg) + } + out := make([]Type, 0, len(ft.out())) + for _, ret := range ft.out() { + out = append(out, ret) + } + mt := FuncOf(in, out, ft.IsVariadic()) + m.Type = mt + prop := js.Global.Call("$methodSet", js.InternalObject(t).Get(idJsType)).Index(i).Get("prop").String() + fn := js.MakeFunc(func(this *js.Object, arguments []*js.Object) interface{} { + rcvr := arguments[0] + return rcvr.Get(prop).Call("apply", rcvr, arguments[1:]) + }) + m.Func = Value{mt.(*rtype), unsafe.Pointer(fn.Unsafe()), fl} + + m.Index = i + return m +} diff --git a/compiler/natives/src/internal/reflectlite/utils.go b/compiler/natives/src/internal/reflectlite/utils.go new file mode 100644 index 000000000..1941f0d0e --- /dev/null +++ b/compiler/natives/src/internal/reflectlite/utils.go @@ -0,0 +1,99 @@ +//go:build js +// +build js + +package reflectlite + +import ( + "unsafe" +) + +type ChanDir int + +const ( + RecvDir ChanDir = 1 << iota // <-chan + SendDir // chan<- + BothDir = RecvDir | SendDir // chan +) + +type errorString struct { + s string +} + +func (e *errorString) Error() string { + return e.s +} + +var ErrSyntax = &errorString{"invalid syntax"} + +func unquote(s string) (string, error) { + if len(s) < 2 { + return s, nil + } + if s[0] == '\'' || s[0] == '"' { + if s[len(s)-1] == s[0] { + return s[1 : len(s)-1], nil + } + return "", ErrSyntax + } + return s, nil +} + +// Method represents a single method. +type Method struct { + // Name is the method name. + // PkgPath is the package path that qualifies a lower case (unexported) + // method name. It is empty for upper case (exported) method names. + // The combination of PkgPath and Name uniquely identifies a method + // in a method set. + // See https://golang.org/ref/spec#Uniqueness_of_identifiers + Name string + PkgPath string + + Type Type // method type + Func Value // func with receiver as first argument + Index int // index for Type.Method +} + +// A SelectDir describes the communication direction of a select case. +type SelectDir int + +// NOTE: These values must match ../runtime/select.go:/selectDir. + +const ( + _ SelectDir = iota + SelectSend // case Chan <- Send + SelectRecv // case <-Chan: + SelectDefault // default +) + +// A runtimeSelect is a single case passed to rselect. +// This must match ../runtime/select.go:/runtimeSelect +type runtimeSelect struct { + dir SelectDir // SelectSend, SelectRecv or SelectDefault + typ *rtype // channel type + ch unsafe.Pointer // channel + val unsafe.Pointer // ptr to data (SendDir) or ptr to receive buffer (RecvDir) +} + +func (f flag) mustBe(expected Kind) { + // TODO(mvdan): use f.kind() again once mid-stack inlining gets better + if Kind(f&flagKindMask) != expected { + panic(&ValueError{methodName(), f.kind()}) + } +} + +// A StructTag is the tag string in a struct field. +// +// By convention, tag strings are a concatenation of +// optionally space-separated key:"value" pairs. +// Each key is a non-empty string consisting of non-control +// characters other than space (U+0020 ' '), quote (U+0022 '"'), +// and colon (U+003A ':'). Each value is quoted using U+0022 '"' +// characters and Go string literal syntax. +type StructTag string + +func typesMustMatch(what string, t1, t2 Type) { + if t1 != t2 { + panic(what + ": " + t1.String() + " != " + t2.String()) + } +} diff --git a/compiler/natives/src/internal/reflectlite/value.go b/compiler/natives/src/internal/reflectlite/value.go new file mode 100644 index 000000000..32d310723 --- /dev/null +++ b/compiler/natives/src/internal/reflectlite/value.go @@ -0,0 +1,586 @@ +//go:build js +// +build js + +package reflectlite + +import ( + "unsafe" + + "github.com/gopherjs/gopherjs/js" +) + +func (v Value) object() *js.Object { + if v.typ.Kind() == Array || v.typ.Kind() == Struct { + return js.InternalObject(v.ptr) + } + if v.flag&flagIndir != 0 { + val := js.InternalObject(v.ptr).Call("$get") + if val != js.Global.Get("$ifaceNil") && val.Get("constructor") != jsType(v.typ) { + switch v.typ.Kind() { + case Uint64, Int64: + val = jsType(v.typ).New(val.Get("$high"), val.Get("$low")) + case Complex64, Complex128: + val = jsType(v.typ).New(val.Get("$real"), val.Get("$imag")) + case Slice: + if val == val.Get("constructor").Get("nil") { + val = jsType(v.typ).Get("nil") + break + } + newVal := jsType(v.typ).New(val.Get("$array")) + newVal.Set("$offset", val.Get("$offset")) + newVal.Set("$length", val.Get("$length")) + newVal.Set("$capacity", val.Get("$capacity")) + val = newVal + } + } + return js.InternalObject(val.Unsafe()) + } + return js.InternalObject(v.ptr) +} + +func (v Value) assignTo(context string, dst *rtype, target unsafe.Pointer) Value { + if v.flag&flagMethod != 0 { + v = makeMethodValue(context, v) + } + switch { + case directlyAssignable(dst, v.typ): + // Overwrite type so that they match. + // Same memory layout, so no harm done. + fl := v.flag&(flagAddr|flagIndir) | v.flag.ro() + fl |= flag(dst.Kind()) + return Value{dst, v.ptr, fl} + + case implements(dst, v.typ): + if target == nil { + target = unsafe_New(dst) + } + // GopherJS: Skip the v.Kind() == Interface && v.IsNil() if statement + // from upstream. ifaceE2I below does not panic, and it needs + // to run, given its custom implementation. + x := valueInterface(v) + if dst.NumMethod() == 0 { + *(*interface{})(target) = x + } else { + ifaceE2I(dst, x, target) + } + return Value{dst, target, flagIndir | flag(Interface)} + } + + // Failed. + panic(context + ": value of type " + v.typ.String() + " is not assignable to type " + dst.String()) +} + +var callHelper = js.Global.Get("$call").Interface().(func(...interface{}) *js.Object) + +func (v Value) call(op string, in []Value) []Value { + var ( + t *funcType + fn unsafe.Pointer + rcvr *js.Object + ) + if v.flag&flagMethod != 0 { + _, t, fn = methodReceiver(op, v, int(v.flag)>>flagMethodShift) + rcvr = v.object() + if isWrapped(v.typ) { + rcvr = jsType(v.typ).New(rcvr) + } + } else { + t = (*funcType)(unsafe.Pointer(v.typ)) + fn = unsafe.Pointer(v.object().Unsafe()) + rcvr = js.Undefined + } + + if fn == nil { + panic("reflect.Value.Call: call of nil function") + } + + isSlice := op == "CallSlice" + n := t.NumIn() + if isSlice { + if !t.IsVariadic() { + panic("reflect: CallSlice of non-variadic function") + } + if len(in) < n { + panic("reflect: CallSlice with too few input arguments") + } + if len(in) > n { + panic("reflect: CallSlice with too many input arguments") + } + } else { + if t.IsVariadic() { + n-- + } + if len(in) < n { + panic("reflect: Call with too few input arguments") + } + if !t.IsVariadic() && len(in) > n { + panic("reflect: Call with too many input arguments") + } + } + for _, x := range in { + if x.Kind() == Invalid { + panic("reflect: " + op + " using zero Value argument") + } + } + for i := 0; i < n; i++ { + if xt, targ := in[i].Type(), t.In(i); !xt.AssignableTo(targ) { + panic("reflect: " + op + " using " + xt.String() + " as type " + targ.String()) + } + } + if !isSlice && t.IsVariadic() { + // prepare slice for remaining values + m := len(in) - n + slice := MakeSlice(t.In(n), m, m) + elem := t.In(n).Elem() + for i := 0; i < m; i++ { + x := in[n+i] + if xt := x.Type(); !xt.AssignableTo(elem) { + panic("reflect: cannot use " + xt.String() + " as type " + elem.String() + " in " + op) + } + slice.Index(i).Set(x) + } + origIn := in + in = make([]Value, n+1) + copy(in[:n], origIn) + in[n] = slice + } + + nin := len(in) + if nin != t.NumIn() { + panic("reflect.Value.Call: wrong argument count") + } + nout := t.NumOut() + + argsArray := js.Global.Get("Array").New(t.NumIn()) + for i, arg := range in { + argsArray.SetIndex(i, unwrapJsObject(t.In(i), arg.assignTo("reflect.Value.Call", t.In(i).common(), nil).object())) + } + results := callHelper(js.InternalObject(fn), rcvr, argsArray) + + switch nout { + case 0: + return nil + case 1: + return []Value{makeValue(t.Out(0), wrapJsObject(t.Out(0), results), 0)} + default: + ret := make([]Value, nout) + for i := range ret { + ret[i] = makeValue(t.Out(i), wrapJsObject(t.Out(i), results.Index(i)), 0) + } + return ret + } +} + +func (v Value) Cap() int { + k := v.kind() + switch k { + case Array: + return v.typ.Len() + case Chan, Slice: + return v.object().Get("$capacity").Int() + } + panic(&ValueError{"reflect.Value.Cap", k}) +} + +func (v Value) Index(i int) Value { + switch k := v.kind(); k { + case Array: + tt := (*arrayType)(unsafe.Pointer(v.typ)) + if i < 0 || i > int(tt.len) { + panic("reflect: array index out of range") + } + typ := tt.elem + fl := v.flag&(flagIndir|flagAddr) | v.flag.ro() | flag(typ.Kind()) + + a := js.InternalObject(v.ptr) + if fl&flagIndir != 0 && typ.Kind() != Array && typ.Kind() != Struct { + return Value{typ, unsafe.Pointer(jsType(PtrTo(typ)).New( + js.InternalObject(func() *js.Object { return wrapJsObject(typ, a.Index(i)) }), + js.InternalObject(func(x *js.Object) { a.SetIndex(i, unwrapJsObject(typ, x)) }), + ).Unsafe()), fl} + } + return makeValue(typ, wrapJsObject(typ, a.Index(i)), fl) + + case Slice: + s := v.object() + if i < 0 || i >= s.Get("$length").Int() { + panic("reflect: slice index out of range") + } + tt := (*sliceType)(unsafe.Pointer(v.typ)) + typ := tt.elem + fl := flagAddr | flagIndir | v.flag.ro() | flag(typ.Kind()) + + i += s.Get("$offset").Int() + a := s.Get("$array") + if fl&flagIndir != 0 && typ.Kind() != Array && typ.Kind() != Struct { + return Value{typ, unsafe.Pointer(jsType(PtrTo(typ)).New( + js.InternalObject(func() *js.Object { return wrapJsObject(typ, a.Index(i)) }), + js.InternalObject(func(x *js.Object) { a.SetIndex(i, unwrapJsObject(typ, x)) }), + ).Unsafe()), fl} + } + return makeValue(typ, wrapJsObject(typ, a.Index(i)), fl) + + case String: + str := *(*string)(v.ptr) + if i < 0 || i >= len(str) { + panic("reflect: string index out of range") + } + fl := v.flag.ro() | flag(Uint8) | flagIndir + c := str[i] + return Value{uint8Type, unsafe.Pointer(&c), fl} + + default: + panic(&ValueError{"reflect.Value.Index", k}) + } +} + +func (v Value) InterfaceData() [2]uintptr { + panic("InterfaceData is not supported by GopherJS") +} + +func (v Value) IsNil() bool { + switch k := v.kind(); k { + case Ptr, Slice: + return v.object() == jsType(v.typ).Get("nil") + case Chan: + return v.object() == js.Global.Get("$chanNil") + case Func: + return v.object() == js.Global.Get("$throwNilPointerError") + case Map: + return v.object() == js.InternalObject(false) + case Interface: + return v.object() == js.Global.Get("$ifaceNil") + case UnsafePointer: + return v.object().Unsafe() == 0 + default: + panic(&ValueError{"reflect.Value.IsNil", k}) + } +} + +func (v Value) Len() int { + switch k := v.kind(); k { + case Array, String: + return v.object().Length() + case Slice: + return v.object().Get("$length").Int() + case Chan: + return v.object().Get("$buffer").Get("length").Int() + case Map: + return v.object().Get("size").Int() + default: + panic(&ValueError{"reflect.Value.Len", k}) + } +} + +func (v Value) Pointer() uintptr { + switch k := v.kind(); k { + case Chan, Map, Ptr, UnsafePointer: + if v.IsNil() { + return 0 + } + return v.object().Unsafe() + case Func: + if v.IsNil() { + return 0 + } + return 1 + case Slice: + if v.IsNil() { + return 0 + } + return v.object().Get("$array").Unsafe() + default: + panic(&ValueError{"reflect.Value.Pointer", k}) + } +} + +func (v Value) Set(x Value) { + v.mustBeAssignable() + x.mustBeExported() + x = x.assignTo("reflect.Set", v.typ, nil) + if v.flag&flagIndir != 0 { + switch v.typ.Kind() { + case Array: + jsType(v.typ).Call("copy", js.InternalObject(v.ptr), js.InternalObject(x.ptr)) + case Interface: + js.InternalObject(v.ptr).Call("$set", js.InternalObject(valueInterface(x))) + case Struct: + copyStruct(js.InternalObject(v.ptr), js.InternalObject(x.ptr), v.typ) + default: + js.InternalObject(v.ptr).Call("$set", x.object()) + } + return + } + v.ptr = x.ptr +} + +func (v Value) SetBytes(x []byte) { + v.mustBeAssignable() + v.mustBe(Slice) + if v.typ.Elem().Kind() != Uint8 { + panic("reflect.Value.SetBytes of non-byte slice") + } + slice := js.InternalObject(x) + if v.typ.Name() != "" || v.typ.Elem().Name() != "" { + typedSlice := jsType(v.typ).New(slice.Get("$array")) + typedSlice.Set("$offset", slice.Get("$offset")) + typedSlice.Set("$length", slice.Get("$length")) + typedSlice.Set("$capacity", slice.Get("$capacity")) + slice = typedSlice + } + js.InternalObject(v.ptr).Call("$set", slice) +} + +func (v Value) SetCap(n int) { + v.mustBeAssignable() + v.mustBe(Slice) + s := js.InternalObject(v.ptr).Call("$get") + if n < s.Get("$length").Int() || n > s.Get("$capacity").Int() { + panic("reflect: slice capacity out of range in SetCap") + } + newSlice := jsType(v.typ).New(s.Get("$array")) + newSlice.Set("$offset", s.Get("$offset")) + newSlice.Set("$length", s.Get("$length")) + newSlice.Set("$capacity", n) + js.InternalObject(v.ptr).Call("$set", newSlice) +} + +func (v Value) SetLen(n int) { + v.mustBeAssignable() + v.mustBe(Slice) + s := js.InternalObject(v.ptr).Call("$get") + if n < 0 || n > s.Get("$capacity").Int() { + panic("reflect: slice length out of range in SetLen") + } + newSlice := jsType(v.typ).New(s.Get("$array")) + newSlice.Set("$offset", s.Get("$offset")) + newSlice.Set("$length", n) + newSlice.Set("$capacity", s.Get("$capacity")) + js.InternalObject(v.ptr).Call("$set", newSlice) +} + +func (v Value) Slice(i, j int) Value { + var ( + cap int + typ Type + s *js.Object + ) + switch kind := v.kind(); kind { + case Array: + if v.flag&flagAddr == 0 { + panic("reflect.Value.Slice: slice of unaddressable array") + } + tt := (*arrayType)(unsafe.Pointer(v.typ)) + cap = int(tt.len) + typ = SliceOf(tt.elem) + s = jsType(typ).New(v.object()) + + case Slice: + typ = v.typ + s = v.object() + cap = s.Get("$capacity").Int() + + case String: + str := *(*string)(v.ptr) + if i < 0 || j < i || j > len(str) { + panic("reflect.Value.Slice: string slice index out of bounds") + } + return ValueOf(str[i:j]) + + default: + panic(&ValueError{"reflect.Value.Slice", kind}) + } + + if i < 0 || j < i || j > cap { + panic("reflect.Value.Slice: slice index out of bounds") + } + + return makeValue(typ, js.Global.Call("$subslice", s, i, j), v.flag.ro()) +} + +func (v Value) Slice3(i, j, k int) Value { + var ( + cap int + typ Type + s *js.Object + ) + switch kind := v.kind(); kind { + case Array: + if v.flag&flagAddr == 0 { + panic("reflect.Value.Slice: slice of unaddressable array") + } + tt := (*arrayType)(unsafe.Pointer(v.typ)) + cap = int(tt.len) + typ = SliceOf(tt.elem) + s = jsType(typ).New(v.object()) + + case Slice: + typ = v.typ + s = v.object() + cap = s.Get("$capacity").Int() + + default: + panic(&ValueError{"reflect.Value.Slice3", kind}) + } + + if i < 0 || j < i || k < j || k > cap { + panic("reflect.Value.Slice3: slice index out of bounds") + } + + return makeValue(typ, js.Global.Call("$subslice", s, i, j, k), v.flag.ro()) +} + +func (v Value) Close() { + v.mustBe(Chan) + v.mustBeExported() + js.Global.Call("$close", v.object()) +} + +func (v Value) Elem() Value { + switch k := v.kind(); k { + case Interface: + val := v.object() + if val == js.Global.Get("$ifaceNil") { + return Value{} + } + typ := reflectType(val.Get("constructor")) + return makeValue(typ, val.Get("$val"), v.flag.ro()) + + case Ptr: + if v.IsNil() { + return Value{} + } + val := v.object() + tt := (*ptrType)(unsafe.Pointer(v.typ)) + fl := v.flag&flagRO | flagIndir | flagAddr + fl |= flag(tt.elem.Kind()) + return Value{tt.elem, unsafe.Pointer(wrapJsObject(tt.elem, val).Unsafe()), fl} + + default: + panic(&ValueError{"reflect.Value.Elem", k}) + } +} + +// NumField returns the number of fields in the struct v. +// It panics if v's Kind is not Struct. +func (v Value) NumField() int { + v.mustBe(Struct) + tt := (*structType)(unsafe.Pointer(v.typ)) + return len(tt.fields) +} + +// MapKeys returns a slice containing all the keys present in the map, +// in unspecified order. +// It panics if v's Kind is not Map. +// It returns an empty slice if v represents a nil map. +func (v Value) MapKeys() []Value { + v.mustBe(Map) + tt := (*mapType)(unsafe.Pointer(v.typ)) + keyType := tt.key + + fl := v.flag.ro() | flag(keyType.Kind()) + + m := v.pointer() + mlen := int(0) + if m != nil { + mlen = maplen(m) + } + it := mapiterinit(v.typ, m) + a := make([]Value, mlen) + var i int + for i = 0; i < len(a); i++ { + key := mapiterkey(it) + if key == nil { + // Someone deleted an entry from the map since we + // called maplen above. It's a data race, but nothing + // we can do about it. + break + } + a[i] = copyVal(keyType, fl, key) + mapiternext(it) + } + return a[:i] +} + +// MapIndex returns the value associated with key in the map v. +// It panics if v's Kind is not Map. +// It returns the zero Value if key is not found in the map or if v represents a nil map. +// As in Go, the key's value must be assignable to the map's key type. +func (v Value) MapIndex(key Value) Value { + v.mustBe(Map) + tt := (*mapType)(unsafe.Pointer(v.typ)) + + // Do not require key to be exported, so that DeepEqual + // and other programs can use all the keys returned by + // MapKeys as arguments to MapIndex. If either the map + // or the key is unexported, though, the result will be + // considered unexported. This is consistent with the + // behavior for structs, which allow read but not write + // of unexported fields. + key = key.assignTo("reflect.Value.MapIndex", tt.key, nil) + + var k unsafe.Pointer + if key.flag&flagIndir != 0 { + k = key.ptr + } else { + k = unsafe.Pointer(&key.ptr) + } + e := mapaccess(v.typ, v.pointer(), k) + if e == nil { + return Value{} + } + typ := tt.elem + fl := (v.flag | key.flag).ro() + fl |= flag(typ.Kind()) + return copyVal(typ, fl, e) +} + +func (v Value) Field(i int) Value { + if v.kind() != Struct { + panic(&ValueError{"reflect.Value.Field", v.kind()}) + } + tt := (*structType)(unsafe.Pointer(v.typ)) + if uint(i) >= uint(len(tt.fields)) { + panic("reflect: Field index out of range") + } + + prop := jsType(v.typ).Get("fields").Index(i).Get("prop").String() + field := &tt.fields[i] + typ := field.typ + + fl := v.flag&(flagStickyRO|flagIndir|flagAddr) | flag(typ.Kind()) + if !field.name.isExported() { + if field.embedded() { + fl |= flagEmbedRO + } else { + fl |= flagStickyRO + } + } + + if tag := tt.fields[i].name.tag(); tag != "" && i != 0 { + if jsTag := getJsTag(tag); jsTag != "" { + for { + v = v.Field(0) + if v.typ == jsObjectPtr { + o := v.object().Get("object") + return Value{typ, unsafe.Pointer(jsType(PtrTo(typ)).New( + js.InternalObject(func() *js.Object { return js.Global.Call("$internalize", o.Get(jsTag), jsType(typ)) }), + js.InternalObject(func(x *js.Object) { o.Set(jsTag, js.Global.Call("$externalize", x, jsType(typ))) }), + ).Unsafe()), fl} + } + if v.typ.Kind() == Ptr { + v = v.Elem() + } + } + } + } + + s := js.InternalObject(v.ptr) + if fl&flagIndir != 0 && typ.Kind() != Array && typ.Kind() != Struct { + return Value{typ, unsafe.Pointer(jsType(PtrTo(typ)).New( + js.InternalObject(func() *js.Object { return wrapJsObject(typ, s.Get(prop)) }), + js.InternalObject(func(x *js.Object) { s.Set(prop, unwrapJsObject(typ, x)) }), + ).Unsafe()), fl} + } + return makeValue(typ, wrapJsObject(typ, s.Get(prop)), fl) +} diff --git a/compiler/natives/src/internal/syscall/unix/unix.go b/compiler/natives/src/internal/syscall/unix/unix.go deleted file mode 100644 index 583259037..000000000 --- a/compiler/natives/src/internal/syscall/unix/unix.go +++ /dev/null @@ -1,18 +0,0 @@ -// +build js - -package unix - -import "syscall" - -const randomTrap = 0 -const fstatatTrap = 0 - -func IsNonblock(fd int) (nonblocking bool, err error) { - return false, nil -} - -func unlinkat(dirfd int, path string, flags int) error { - // There's no SYS_UNLINKAT defined in Go 1.12 for Darwin, - // so just implement unlinkat using unlink for now. - return syscall.Unlink(path) -} diff --git a/compiler/natives/src/internal/testenv/testenv.go b/compiler/natives/src/internal/testenv/testenv.go deleted file mode 100644 index 481414e08..000000000 --- a/compiler/natives/src/internal/testenv/testenv.go +++ /dev/null @@ -1,26 +0,0 @@ -// +build js - -package testenv - -import ( - "runtime" - "strings" -) - -// HasExec reports whether the current system can start new processes -// using os.StartProcess or (more commonly) exec.Command. -func HasExec() bool { - switch runtime.GOOS { - case "nacl": - return false - case "darwin": - if strings.HasPrefix(runtime.GOARCH, "arm") { - return false - } - } - switch runtime.GOARCH { - case "js": - return false - } - return true -} diff --git a/compiler/natives/src/internal/unsafeheader/unsafeheader_test.go b/compiler/natives/src/internal/unsafeheader/unsafeheader_test.go new file mode 100644 index 000000000..f20cf31fa --- /dev/null +++ b/compiler/natives/src/internal/unsafeheader/unsafeheader_test.go @@ -0,0 +1,10 @@ +//go:build js +// +build js + +package unsafeheader_test + +import "testing" + +func TestWriteThroughHeader(t *testing.T) { + t.Skip("GopherJS uses different slice and string implementation than internal/unsafeheader.") +} diff --git a/compiler/natives/src/io/io_test.go b/compiler/natives/src/io/io_test.go index a436fe023..d746b3709 100644 --- a/compiler/natives/src/io/io_test.go +++ b/compiler/natives/src/io/io_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package io_test @@ -10,14 +11,13 @@ func TestMultiWriter_WriteStringSingleAlloc(t *testing.T) { t.Skip() } -func TestMultiReaderFlatten(t *testing.T) { - t.Skip("test relies on runtime.Callers and runtime.CallersFrames, which GopherJS doesn't support") -} - -func TestMultiWriterSingleChainFlatten(t *testing.T) { - t.Skip("test relies on runtime.Callers and runtime.CallersFrames, which GopherJS doesn't support") -} - func TestMultiReaderFreesExhaustedReaders(t *testing.T) { t.Skip("test relies on runtime.SetFinalizer, which GopherJS does not implement") } + +func TestCopyLargeWriter(t *testing.T) { + // This test actually behaves more or less correctly, but it triggers a + // different code path that panics instead of returning an error due to a bug + // referenced below. + t.Skip("https://github.com/gopherjs/gopherjs/issues/1003") +} diff --git a/compiler/natives/src/math/big/big.go b/compiler/natives/src/math/big/big.go index 833747570..25512db31 100644 --- a/compiler/natives/src/math/big/big.go +++ b/compiler/natives/src/math/big/big.go @@ -1,7 +1,9 @@ +//go:build js // +build js package big // TODO: This is a workaround for https://github.com/gopherjs/gopherjs/issues/652. -// Remove after that issue is resolved. +// +// Remove after that issue is resolved. type Word uintptr diff --git a/compiler/natives/src/math/big/big_test.go b/compiler/natives/src/math/big/big_test.go index 782095620..acad9a043 100644 --- a/compiler/natives/src/math/big/big_test.go +++ b/compiler/natives/src/math/big/big_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package big @@ -11,3 +12,7 @@ func TestBytes(t *testing.T) { func TestModSqrt(t *testing.T) { t.Skip("slow") } + +func TestLinkerGC(t *testing.T) { + t.Skip("The test is specific to GC's linker.") +} diff --git a/compiler/natives/src/math/bits/bits.go b/compiler/natives/src/math/bits/bits.go index d29fcf079..b434603a4 100644 --- a/compiler/natives/src/math/bits/bits.go +++ b/compiler/natives/src/math/bits/bits.go @@ -1,3 +1,4 @@ +//go:build js // +build js package bits @@ -16,3 +17,86 @@ var ( overflowError error = _err("runtime error: integer overflow") divideError error = _err("runtime error: integer divide by zero") ) + +func Mul32(x, y uint32) (hi, lo uint32) { + // Avoid slow 64-bit integers for better performance. Adapted from Mul64(). + const mask16 = 1<<16 - 1 + x0 := x & mask16 + x1 := x >> 16 + y0 := y & mask16 + y1 := y >> 16 + w0 := x0 * y0 + t := x1*y0 + w0>>16 + w1 := t & mask16 + w2 := t >> 16 + w1 += x0 * y1 + hi = x1*y1 + w2 + w1>>16 + lo = x * y + return +} + +func Add32(x, y, carry uint32) (sum, carryOut uint32) { + // Avoid slow 64-bit integers for better performance. Adapted from Add64(). + sum = x + y + carry + carryOut = ((x & y) | ((x | y) &^ sum)) >> 31 + return +} + +func Div32(hi, lo, y uint32) (quo, rem uint32) { + // Avoid slow 64-bit integers for better performance. Adapted from Div64(). + const ( + two16 = 1 << 16 + mask16 = two16 - 1 + ) + if y == 0 { + panic(divideError) + } + if y <= hi { + panic(overflowError) + } + + s := uint(LeadingZeros32(y)) + y <<= s + + yn1 := y >> 16 + yn0 := y & mask16 + un16 := hi<>(32-s) + un10 := lo << s + un1 := un10 >> 16 + un0 := un10 & mask16 + q1 := un16 / yn1 + rhat := un16 - q1*yn1 + + for q1 >= two16 || q1*yn0 > two16*rhat+un1 { + q1-- + rhat += yn1 + if rhat >= two16 { + break + } + } + + un21 := un16*two16 + un1 - q1*y + q0 := un21 / yn1 + rhat = un21 - q0*yn1 + + for q0 >= two16 || q0*yn0 > two16*rhat+un0 { + q0-- + rhat += yn1 + if rhat >= two16 { + break + } + } + + return q1*two16 + q0, (un21*two16 + un0 - q0*y) >> s +} + +func Rem32(hi, lo, y uint32) uint32 { + // We scale down hi so that hi < y, then use Div32 to compute the + // rem with the guarantee that it won't panic on quotient overflow. + // Given that + // hi ≡ hi%y (mod y) + // we have + // hi<<64 + lo ≡ (hi%y)<<64 + lo (mod y) + _, rem := Div32(hi%y, lo, y) + return rem +} diff --git a/compiler/natives/src/math/math.go b/compiler/natives/src/math/math.go index ca09bfcd0..b0ed2da0d 100644 --- a/compiler/natives/src/math/math.go +++ b/compiler/natives/src/math/math.go @@ -1,3 +1,4 @@ +//go:build js // +build js package math @@ -6,11 +7,18 @@ import ( "github.com/gopherjs/gopherjs/js" ) -var math = js.Global.Get("Math") -var zero float64 = 0 -var posInf = 1 / zero -var negInf = -1 / zero -var nan = 0 / zero +var ( + math = js.Global.Get("Math") + _zero float64 = 0 + posInf = 1 / _zero + negInf = -1 / _zero +) + +// Usually, NaN can be obtained in JavaScript with `0 / 0` operation. However, +// in V8, `0 / _zero` yields a bitwise-different value of NaN compared to the +// default NaN or `0 / 0`. Unfortunately, Go compiler forbids division by zero, +// so we have to get this value from prelude. +var nan = js.Global.Get("$NaN").Float() func Acos(x float64) float64 { return math.Call("acos", x).Float() diff --git a/compiler/natives/src/math/math_test.go b/compiler/natives/src/math/math_test.go index daf35dda0..eb62dd1d1 100644 --- a/compiler/natives/src/math/math_test.go +++ b/compiler/natives/src/math/math_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package math_test @@ -6,12 +7,13 @@ import ( "testing" ) -// Slighly higher tolerances than upstream, otherwise TestGamma fails. +// Slightly higher tolerances than upstream, otherwise TestGamma fails. // TODO: Is there a better way to fix TestGamma? It's weird that only one test -// requires increasing tolerances. Perhaps there's a better fix? Maybe we -// should override TestGamma specifically and not the package-wide tolerances, -// because this will cause many other tests to be less accurate. Or maybe this -// is fine? +// +// requires increasing tolerances. Perhaps there's a better fix? Maybe we +// should override TestGamma specifically and not the package-wide tolerances, +// because this will cause many other tests to be less accurate. Or maybe this +// is fine? func close(a, b float64) bool { return tolerance(a, b, 4e-14) } func veryclose(a, b float64) bool { return tolerance(a, b, 6e-15) } diff --git a/compiler/natives/src/math/rand/rand_test.go b/compiler/natives/src/math/rand/rand_test.go index 0475334d2..2246dfec4 100644 --- a/compiler/natives/src/math/rand/rand_test.go +++ b/compiler/natives/src/math/rand/rand_test.go @@ -1,6 +1,7 @@ +//go:build js // +build js -package rand +package rand_test import "testing" diff --git a/compiler/natives/src/net/fastrand.go b/compiler/natives/src/net/fastrand.go new file mode 100644 index 000000000..8feafc78f --- /dev/null +++ b/compiler/natives/src/net/fastrand.go @@ -0,0 +1,11 @@ +//go:build js +// +build js + +package net + +import ( + _ "unsafe" // For go:linkname +) + +//go:linkname fastrandu runtime.fastrandu +func fastrandu() uint diff --git a/compiler/natives/src/net/http/client_test.go b/compiler/natives/src/net/http/client_test.go new file mode 100644 index 000000000..302b800df --- /dev/null +++ b/compiler/natives/src/net/http/client_test.go @@ -0,0 +1,21 @@ +//go:build js + +package http_test + +import ( + "testing" +) + +func testClientTimeout(t *testing.T, h2 bool) { + // The original test expects Client.Timeout error to be returned, but under + // GopherJS an "i/o timeout" error is frequently returned. Otherwise the test + // seems to be working correctly. + t.Skip("Flaky test under GopherJS.") +} + +func testClientTimeout_Headers(t *testing.T, h2 bool) { + // The original test expects Client.Timeout error to be returned, but under + // GopherJS an "i/o timeout" error is frequently returned. Otherwise the test + // seems to be working correctly. + t.Skip("Flaky test under GopherJS.") +} diff --git a/compiler/natives/src/net/http/clientserver_test.go b/compiler/natives/src/net/http/clientserver_test.go new file mode 100644 index 000000000..35b44dd4d --- /dev/null +++ b/compiler/natives/src/net/http/clientserver_test.go @@ -0,0 +1,16 @@ +//go:build js && wasm +// +build js,wasm + +package http_test + +import ( + "testing" +) + +func testTransportGCRequest(t *testing.T, h2, body bool) { + t.Skip("The test relies on runtime.SetFinalizer(), which is not supported by GopherJS.") +} + +func testWriteHeaderAfterWrite(t *testing.T, h2, hijack bool) { + t.Skip("GopherJS source maps don't preserve original function names in stack traces, which this test relied on.") +} diff --git a/compiler/natives/src/net/http/cookiejar/example_test.go b/compiler/natives/src/net/http/cookiejar/example_test.go index ab42bef6d..09de5d0cf 100644 --- a/compiler/natives/src/net/http/cookiejar/example_test.go +++ b/compiler/natives/src/net/http/cookiejar/example_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package cookiejar_test diff --git a/compiler/natives/src/net/http/fetch.go b/compiler/natives/src/net/http/fetch.go deleted file mode 100644 index f9123d090..000000000 --- a/compiler/natives/src/net/http/fetch.go +++ /dev/null @@ -1,134 +0,0 @@ -// +build js - -package http - -import ( - "errors" - "fmt" - "io" - "io/ioutil" - "strconv" - - "github.com/gopherjs/gopherjs/js" -) - -// streamReader implements an io.ReadCloser wrapper for ReadableStream of https://fetch.spec.whatwg.org/. -type streamReader struct { - pending []byte - stream *js.Object -} - -func (r *streamReader) Read(p []byte) (n int, err error) { - if len(r.pending) == 0 { - var ( - bCh = make(chan []byte) - errCh = make(chan error) - ) - r.stream.Call("read").Call("then", - func(result *js.Object) { - if result.Get("done").Bool() { - errCh <- io.EOF - return - } - bCh <- result.Get("value").Interface().([]byte) - }, - func(reason *js.Object) { - // Assumes it's a DOMException. - errCh <- errors.New(reason.Get("message").String()) - }, - ) - select { - case b := <-bCh: - r.pending = b - case err := <-errCh: - return 0, err - } - } - n = copy(p, r.pending) - r.pending = r.pending[n:] - return n, nil -} - -func (r *streamReader) Close() error { - // This ignores any error returned from cancel method. So far, I did not encounter any concrete - // situation where reporting the error is meaningful. Most users ignore error from resp.Body.Close(). - // If there's a need to report error here, it can be implemented and tested when that need comes up. - r.stream.Call("cancel") - return nil -} - -// fetchTransport is a RoundTripper that is implemented using Fetch API. It supports streaming -// response bodies. -type fetchTransport struct{} - -func (t *fetchTransport) RoundTrip(req *Request) (*Response, error) { - headers := js.Global.Get("Headers").New() - for key, values := range req.Header { - for _, value := range values { - headers.Call("append", key, value) - } - } - opt := map[string]interface{}{ - "method": req.Method, - "headers": headers, - "credentials": "same-origin", - } - if req.Body != nil { - // TODO: Find out if request body can be streamed into the fetch request rather than in advance here. - // See BufferSource at https://fetch.spec.whatwg.org/#body-mixin. - body, err := ioutil.ReadAll(req.Body) - if err != nil { - req.Body.Close() // RoundTrip must always close the body, including on errors. - return nil, err - } - req.Body.Close() - opt["body"] = body - } - respPromise := js.Global.Call("fetch", req.URL.String(), opt) - - var ( - respCh = make(chan *Response) - errCh = make(chan error) - ) - respPromise.Call("then", - func(result *js.Object) { - header := Header{} - result.Get("headers").Call("forEach", func(value, key *js.Object) { - ck := CanonicalHeaderKey(key.String()) - header[ck] = append(header[ck], value.String()) - }) - - contentLength := int64(-1) - if cl, err := strconv.ParseInt(header.Get("Content-Length"), 10, 64); err == nil { - contentLength = cl - } - - select { - case respCh <- &Response{ - Status: result.Get("status").String() + " " + StatusText(result.Get("status").Int()), - StatusCode: result.Get("status").Int(), - Header: header, - ContentLength: contentLength, - Body: &streamReader{stream: result.Get("body").Call("getReader")}, - Request: req, - }: - case <-req.Context().Done(): - } - }, - func(reason *js.Object) { - select { - case errCh <- fmt.Errorf("net/http: fetch() failed: %s", reason.String()): - case <-req.Context().Done(): - } - }, - ) - select { - case <-req.Context().Done(): - // TODO: Abort request if possible using Fetch API. - return nil, errors.New("net/http: request canceled") - case resp := <-respCh: - return resp, nil - case err := <-errCh: - return nil, err - } -} diff --git a/compiler/natives/src/net/http/http.go b/compiler/natives/src/net/http/http.go index 105f72831..8fd607c4d 100644 --- a/compiler/natives/src/net/http/http.go +++ b/compiler/natives/src/net/http/http.go @@ -1,3 +1,4 @@ +//go:build js // +build js package http @@ -6,7 +7,7 @@ import ( "bufio" "bytes" "errors" - "io/ioutil" + "io" "net/textproto" "strconv" @@ -15,8 +16,9 @@ import ( var DefaultTransport = func() RoundTripper { switch { - case js.Global.Get("fetch") != js.Undefined && js.Global.Get("ReadableStream") != js.Undefined: // ReadableStream is used as a check for support of streaming response bodies, see https://fetch.spec.whatwg.org/#streams. - return &fetchTransport{} + case js.Global.Get("fetch") != js.Undefined: + // Use standard library js/wasm fetch-based implementation. + return &Transport{} case js.Global.Get("XMLHttpRequest") != js.Undefined: return &XHRTransport{} default: @@ -66,7 +68,7 @@ func (t *XHRTransport) RoundTrip(req *Request) (*Response, error) { StatusCode: xhr.Get("status").Int(), Header: Header(header), ContentLength: contentLength, - Body: ioutil.NopCloser(bytes.NewReader(body)), + Body: io.NopCloser(bytes.NewReader(body)), Request: req, } }) @@ -89,7 +91,7 @@ func (t *XHRTransport) RoundTrip(req *Request) (*Response, error) { if req.Body == nil { xhr.Call("send") } else { - body, err := ioutil.ReadAll(req.Body) + body, err := io.ReadAll(req.Body) if err != nil { req.Body.Close() // RoundTrip must always close the body, including on errors. return nil, err diff --git a/compiler/natives/src/net/http/http_wasm_test.go b/compiler/natives/src/net/http/http_wasm_test.go new file mode 100644 index 000000000..d078c0ea3 --- /dev/null +++ b/compiler/natives/src/net/http/http_wasm_test.go @@ -0,0 +1,16 @@ +//go:build js && wasm +// +build js,wasm + +package http + +func init() { + // Use standard transport with fake networking under tests. Although GopherJS + // supports "real" http.Client implementations using Fetch or XMLHttpRequest + // APIs, tests also need to start local web servers, which is not supported + // for those APIs. + // TODO(nevkontakte): We could test our real implementations if we mock out + // browser APIs and redirect them to the fake networking stack, but this is + // not easy. + jsFetchMissing = true + DefaultTransport = &Transport{} +} diff --git a/compiler/natives/src/net/http/main_test.go b/compiler/natives/src/net/http/main_test.go new file mode 100644 index 000000000..bb747d123 --- /dev/null +++ b/compiler/natives/src/net/http/main_test.go @@ -0,0 +1,43 @@ +//go:build js && wasm +// +build js,wasm + +package http_test + +import ( + "runtime" + "sort" + "strings" +) + +// This is an almost verbatim copy of the upstream, except one line which was +// adjusted to match GopherJS call stacks. +// This overlay can be remoed if/when https://github.com/golang/go/pull/49128 +// is merged and reached a stable Go release (likely 1.18). +func interestingGoroutines() (gs []string) { + buf := make([]byte, 2<<20) + buf = buf[:runtime.Stack(buf, true)] + for _, g := range strings.Split(string(buf), "\n\n") { + sl := strings.SplitN(g, "\n", 2) + if len(sl) != 2 { + continue + } + stack := strings.TrimSpace(sl[1]) + if stack == "" || + strings.Contains(stack, "testing.(*M).before.func1") || + strings.Contains(stack, "os/signal.signal_recv") || + strings.Contains(stack, "created by net.startServer") || + strings.Contains(stack, "created by testing.RunTests") || + strings.Contains(stack, "closeWriteAndWait") || + strings.Contains(stack, "testing.Main(") || + // These only show up with GOTRACEBACK=2; Issue 5005 (comment 28) + strings.Contains(stack, "runtime.goexit") || + strings.Contains(stack, "created by runtime.gc") || + strings.Contains(stack, "interestingGoroutines") || // ← Changed line. + strings.Contains(stack, "runtime.MHeap_Scavenger") { + continue + } + gs = append(gs, stack) + } + sort.Strings(gs) + return +} diff --git a/compiler/natives/src/net/http/server_test.go b/compiler/natives/src/net/http/server_test.go new file mode 100644 index 000000000..f55704dcf --- /dev/null +++ b/compiler/natives/src/net/http/server_test.go @@ -0,0 +1,10 @@ +//go:build js +// +build js + +package http_test + +import "testing" + +func TestTimeoutHandlerSuperfluousLogs(t *testing.T) { + t.Skip("https://github.com/gopherjs/gopherjs/issues/1085") +} diff --git a/compiler/natives/src/net/http/transport_test.go b/compiler/natives/src/net/http/transport_test.go new file mode 100644 index 000000000..a173e47e7 --- /dev/null +++ b/compiler/natives/src/net/http/transport_test.go @@ -0,0 +1,14 @@ +//go:build js +// +build js + +package http_test + +import "testing" + +func TestTransportPersistConnLeakNeverIdle(t *testing.T) { + t.Skip("test relied on runtime.SetFinalizer(), which is not supported by GopherJS.") +} + +func TestTransportPersistConnContextLeakMaxConnsPerHost(t *testing.T) { + t.Skip("test relied on runtime.SetFinalizer(), which is not supported by GopherJS.") +} diff --git a/compiler/natives/src/net/net.go b/compiler/natives/src/net/net.go deleted file mode 100644 index 10e1161bd..000000000 --- a/compiler/natives/src/net/net.go +++ /dev/null @@ -1,65 +0,0 @@ -// +build js - -package net - -import ( - "errors" - "syscall" - - "github.com/gopherjs/gopherjs/js" -) - -func Listen(net, laddr string) (Listener, error) { - panic(errors.New("network access is not supported by GopherJS")) -} - -func (d *Dialer) Dial(network, address string) (Conn, error) { - panic(errors.New("network access is not supported by GopherJS")) -} - -func sysInit() { -} - -func probeIPv4Stack() bool { - return false -} - -func probeIPv6Stack() (supportsIPv6, supportsIPv4map bool) { - return false, false -} - -func probeWindowsIPStack() (supportsVistaIP bool) { - return false -} - -func maxListenerBacklog() int { - return syscall.SOMAXCONN -} - -// Copy of strings.IndexByte. -func byteIndex(s string, c byte) int { - return js.InternalObject(s).Call("indexOf", js.Global.Get("String").Call("fromCharCode", c)).Int() -} - -// Copy of bytes.Equal. -func bytesEqual(x, y []byte) bool { - if len(x) != len(y) { - return false - } - for i, b := range x { - if b != y[i] { - return false - } - } - return true -} - -// Copy of bytes.IndexByte. -func bytesIndexByte(s []byte, c byte) int { - for i, b := range s { - if b == c { - return i - } - } - return -1 -} diff --git a/compiler/natives/src/net/netip/export_test.go b/compiler/natives/src/net/netip/export_test.go new file mode 100644 index 000000000..03b7cbe1b --- /dev/null +++ b/compiler/natives/src/net/netip/export_test.go @@ -0,0 +1,21 @@ +//go:build js +// +build js + +package netip + +import ( + "fmt" + + "internal/intern" +) + +func MkAddr(u Uint128, z any) Addr { + switch z := z.(type) { + case *intern.Value: + return Addr{u, z.Get().(string)} + case string: + return Addr{u, z} + default: + panic(fmt.Errorf("unexpected type %T of the z argument")) + } +} diff --git a/compiler/natives/src/net/netip/fuzz_test.go b/compiler/natives/src/net/netip/fuzz_test.go new file mode 100644 index 000000000..f7359c5bb --- /dev/null +++ b/compiler/natives/src/net/netip/fuzz_test.go @@ -0,0 +1,11 @@ +//go:build js +// +build js + +package netip_test + +import "testing" + +func checkStringParseRoundTrip(t *testing.T, x interface{}, parse interface{}) { + // TODO(nevkontakte): This function requires generics to function. + // Re-enable after https://github.com/gopherjs/gopherjs/issues/1013 is resolved. +} diff --git a/compiler/natives/src/net/netip/netip.go b/compiler/natives/src/net/netip/netip.go new file mode 100644 index 000000000..9d2b8b2d6 --- /dev/null +++ b/compiler/natives/src/net/netip/netip.go @@ -0,0 +1,38 @@ +//go:build js +// +build js + +package netip + +type Addr struct { + addr uint128 + // Unlike the upstream, we store the string directly instead of trying to + // use internal/intern package for optimization. + z string +} + +var ( + // Sentinel values for different zones. \x00 character makes it unlikely for + // the sentinel value to clash with any real-life IPv6 zone index. + z0 = "" + z4 = "\x00ipv4" + z6noz = "\x00ipv6noz" +) + +func (ip Addr) Zone() string { + if ip.z == z4 || ip.z == z6noz { + return "" + } + return ip.z +} + +func (ip Addr) WithZone(zone string) Addr { + if !ip.Is6() { + return ip + } + if zone == "" { + ip.z = z6noz + return ip + } + ip.z = zone + return ip +} diff --git a/compiler/natives/src/net/netip/netip_test.go b/compiler/natives/src/net/netip/netip_test.go new file mode 100644 index 000000000..46b116c00 --- /dev/null +++ b/compiler/natives/src/net/netip/netip_test.go @@ -0,0 +1,10 @@ +//go:build js +// +build js + +package netip_test + +import "testing" + +func TestAddrStringAllocs(t *testing.T) { + t.Skip("testing.AllocsPerRun not supported in GopherJS") +} diff --git a/compiler/natives/src/os/file.go b/compiler/natives/src/os/file.go new file mode 100644 index 000000000..a3683b8b0 --- /dev/null +++ b/compiler/natives/src/os/file.go @@ -0,0 +1,9 @@ +//go:build js +// +build js + +package os + +// WriteString copied from Go 1.16, before it was made more performant, and unsafe. +func (f *File) WriteString(s string) (n int, err error) { + return f.Write([]byte(s)) +} diff --git a/compiler/natives/src/os/os.go b/compiler/natives/src/os/os.go index 96f36d28b..a45e13508 100644 --- a/compiler/natives/src/os/os.go +++ b/compiler/natives/src/os/os.go @@ -1,23 +1,28 @@ +//go:build js // +build js package os import ( "errors" + _ "unsafe" // for go:linkname "github.com/gopherjs/gopherjs/js" ) +const isBigEndian = false + func runtime_args() []string { // not called on Windows return Args } func init() { if process := js.Global.Get("process"); process != js.Undefined { - argv := process.Get("argv") - Args = make([]string, argv.Length()-1) - for i := 0; i < argv.Length()-1; i++ { - Args[i] = argv.Index(i + 1).String() + if argv := process.Get("argv"); argv != js.Undefined && argv.Length() >= 1 { + Args = make([]string, argv.Length()-1) + for i := 0; i < argv.Length()-1; i++ { + Args[i] = argv.Index(i + 1).String() + } } } if len(Args) == 0 { @@ -30,3 +35,6 @@ func runtime_beforeExit() {} func executable() (string, error) { return "", errors.New("Executable not implemented for GOARCH=js") } + +//go:linkname fastrand runtime.fastrand +func fastrand() uint32 diff --git a/compiler/natives/src/os/signal/signal.go b/compiler/natives/src/os/signal/signal.go index a560f8ec8..fe38d22b2 100644 --- a/compiler/natives/src/os/signal/signal.go +++ b/compiler/natives/src/os/signal/signal.go @@ -1,3 +1,4 @@ +//go:build js // +build js package signal diff --git a/compiler/natives/src/reflect/example_test.go b/compiler/natives/src/reflect/example_test.go index 0953ebd12..0deab2ed5 100644 --- a/compiler/natives/src/reflect/example_test.go +++ b/compiler/natives/src/reflect/example_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package reflect_test diff --git a/compiler/natives/src/reflect/reflect.go b/compiler/natives/src/reflect/reflect.go index 3d0cc4e0f..81f4c7b08 100644 --- a/compiler/natives/src/reflect/reflect.go +++ b/compiler/natives/src/reflect/reflect.go @@ -1,12 +1,16 @@ +//go:build js // +build js package reflect import ( "errors" + "runtime" "strconv" "unsafe" + "internal/itoa" + "github.com/gopherjs/gopherjs/js" ) @@ -33,6 +37,23 @@ func init() { uint8Type = TypeOf(uint8(0)).(*rtype) // set for real } +// New returns a Value representing a pointer to a new zero value +// for the specified type. That is, the returned Value's Type is PtrTo(typ). +// +// The upstream version includes an extra check to avoid creating types that +// are tagged as go:notinheap. This shouldn't matter in GopherJS, and tracking +// that state is over-complex, so we just skip that check. +func New(typ Type) Value { + if typ == nil { + panic("reflect: New(nil)") + } + t := typ.(*rtype) + pt := t.ptrTo() + ptr := unsafe_New(t) + fl := flag(Ptr) + return Value{pt, ptr, fl} +} + func jsType(typ Type) *js.Object { return js.InternalObject(typ).Get("jsType") } @@ -42,7 +63,7 @@ func reflectType(typ *js.Object) *rtype { rt := &rtype{ size: uintptr(typ.Get("size").Int()), kind: uint8(typ.Get("kind").Int()), - str: newNameOff(newName(internalStr(typ.Get("string")), "", typ.Get("exported").Bool())), + str: resolveReflectName(newName(internalStr(typ.Get("string")), "", typ.Get("exported").Bool(), false)), } js.InternalObject(rt).Set("jsType", typ) typ.Set("reflectType", js.InternalObject(rt)) @@ -61,7 +82,7 @@ func reflectType(typ *js.Object) *rtype { continue } reflectMethods = append(reflectMethods, method{ - name: newNameOff(newName(internalStr(m.Get("name")), "", exported)), + name: resolveReflectName(newMethodName(m)), mtyp: newTypeOff(reflectType(m.Get("typ"))), }) } @@ -73,18 +94,18 @@ func reflectType(typ *js.Object) *rtype { continue } reflectMethods = append(reflectMethods, method{ - name: newNameOff(newName(internalStr(m.Get("name")), "", exported)), + name: resolveReflectName(newMethodName(m)), mtyp: newTypeOff(reflectType(m.Get("typ"))), }) } ut := &uncommonType{ - pkgPath: newNameOff(newName(internalStr(typ.Get("pkg")), "", false)), + pkgPath: resolveReflectName(newName(internalStr(typ.Get("pkg")), "", false, false)), mcount: uint16(methodSet.Length()), xcount: xcount, _methods: reflectMethods, } - uncommonTypeMap[rt] = ut js.InternalObject(ut).Set("jsType", typ) + js.InternalObject(rt).Set("uncommonType", js.InternalObject(ut)) } switch rt.Kind() { @@ -133,13 +154,13 @@ func reflectType(typ *js.Object) *rtype { for i := range imethods { m := methods.Index(i) imethods[i] = imethod{ - name: newNameOff(newName(internalStr(m.Get("name")), "", internalStr(m.Get("pkg")) == "")), + name: resolveReflectName(newMethodName(m)), typ: newTypeOff(reflectType(m.Get("typ"))), } } setKindType(rt, &interfaceType{ rtype: *rt, - pkgPath: newName(internalStr(typ.Get("pkg")), "", false), + pkgPath: newName(internalStr(typ.Get("pkg")), "", false, false), methods: imethods, }) case Map: @@ -160,19 +181,15 @@ func reflectType(typ *js.Object) *rtype { reflectFields := make([]structField, fields.Length()) for i := range reflectFields { f := fields.Index(i) - offsetEmbed := uintptr(i) << 1 - if f.Get("embedded").Bool() { - offsetEmbed |= 1 - } reflectFields[i] = structField{ - name: newName(internalStr(f.Get("name")), internalStr(f.Get("tag")), f.Get("exported").Bool()), - typ: reflectType(f.Get("typ")), - offsetEmbed: offsetEmbed, + name: newName(internalStr(f.Get("name")), internalStr(f.Get("tag")), f.Get("exported").Bool(), f.Get("embedded").Bool()), + typ: reflectType(f.Get("typ")), + offset: uintptr(i), } } setKindType(rt, &structType{ rtype: *rt, - pkgPath: newName(internalStr(typ.Get("pkgPath")), "", false), + pkgPath: newName(internalStr(typ.Get("pkgPath")), "", false, false), fields: reflectFields, }) } @@ -203,10 +220,12 @@ func (t *uncommonType) exportedMethods() []method { return t._methods[:t.xcount:t.xcount] } -var uncommonTypeMap = make(map[*rtype]*uncommonType) - func (t *rtype) uncommon() *uncommonType { - return uncommonTypeMap[t] + obj := js.InternalObject(t).Get("uncommonType") + if obj == js.Undefined { + return nil + } + return (*uncommonType)(unsafe.Pointer(obj.Unsafe())) } type funcType struct { @@ -234,34 +253,56 @@ type nameData struct { name string tag string exported bool + embedded bool + pkgPath string } var nameMap = make(map[*byte]*nameData) func (n name) name() (s string) { return nameMap[n.bytes].name } func (n name) tag() (s string) { return nameMap[n.bytes].tag } -func (n name) pkgPath() string { return "" } +func (n name) pkgPath() string { return nameMap[n.bytes].pkgPath } func (n name) isExported() bool { return nameMap[n.bytes].exported } +func (n name) embedded() bool { return nameMap[n.bytes].embedded } +func (n name) setPkgPath(pkgpath string) { + nameMap[n.bytes].pkgPath = pkgpath +} -func newName(n, tag string, exported bool) name { +func newName(n, tag string, exported, embedded bool) name { b := new(byte) nameMap[b] = &nameData{ name: n, tag: tag, exported: exported, + embedded: embedded, } return name{ bytes: b, } } +// newMethodName creates name instance for a method. +// +// Input object is expected to be an entry of the "methods" list of the +// corresponding JS type. +func newMethodName(m *js.Object) name { + b := new(byte) + nameMap[b] = &nameData{ + name: internalStr(m.Get("name")), + tag: "", + pkgPath: internalStr(m.Get("pkg")), + exported: internalStr(m.Get("pkg")) == "", + } + return name{bytes: b} +} + var nameOffList []name func (t *rtype) nameOff(off nameOff) name { return nameOffList[int(off)] } -func newNameOff(n name) nameOff { +func resolveReflectName(n name) nameOff { i := len(nameOffList) nameOffList = append(nameOffList, n) return nameOff(i) @@ -279,6 +320,15 @@ func newTypeOff(t *rtype) typeOff { return typeOff(i) } +// addReflectOff adds a pointer to the reflection lookup map in the runtime. +// It returns a new ID that can be used as a typeOff or textOff, and will +// be resolved correctly. Implemented in the runtime package. +func addReflectOff(ptr unsafe.Pointer) int32 { + i := len(typeOffList) + typeOffList = append(typeOffList, (*rtype)(ptr)) + return int32(i) +} + func internalStr(strObj *js.Object) string { var c struct{ str string } js.InternalObject(c).Set("str", strObj) // get string without internalizing @@ -340,6 +390,10 @@ func ValueOf(i interface{}) Value { } func ArrayOf(count int, elem Type) Type { + if count < 0 { + panic("reflect: negative length passed to ArrayOf") + } + return reflectType(js.Global.Call("$arrayType", jsType(elem), count)) } @@ -380,44 +434,95 @@ func SliceOf(t Type) Type { return reflectType(js.Global.Call("$sliceType", jsType(t))) } -// func StructOf(fields []StructField) Type { -// jsFields := make([]*js.Object, len(fields)) -// fset := map[string]struct{}{} -// for i, f := range fields { -// if f.Type == nil { -// panic("reflect.StructOf: field " + strconv.Itoa(i) + " has no type") -// } - -// name := f.Name -// if name == "" { -// // Embedded field -// if f.Type.Kind() == Ptr { -// // Embedded ** and *interface{} are illegal -// elem := f.Type.Elem() -// if k := elem.Kind(); k == Ptr || k == Interface { -// panic("reflect.StructOf: illegal anonymous field type " + f.Type.String()) -// } -// name = elem.String() -// } else { -// name = f.Type.String() -// } -// } - -// if _, dup := fset[name]; dup { -// panic("reflect.StructOf: duplicate field " + name) -// } -// fset[name] = struct{}{} - -// jsf := js.Global.Get("Object").New() -// jsf.Set("prop", name) -// jsf.Set("name", name) -// jsf.Set("exported", true) -// jsf.Set("typ", jsType(f.Type)) -// jsf.Set("tag", f.Tag) -// jsFields[i] = jsf -// } -// return reflectType(js.Global.Call("$structType", "", jsFields)) -// } +func StructOf(fields []StructField) Type { + var ( + jsFields = make([]*js.Object, len(fields)) + fset = map[string]struct{}{} + pkgpath string + hasGCProg bool + ) + for i, field := range fields { + if field.Name == "" { + panic("reflect.StructOf: field " + strconv.Itoa(i) + " has no name") + } + if !isValidFieldName(field.Name) { + panic("reflect.StructOf: field " + strconv.Itoa(i) + " has invalid name") + } + if field.Type == nil { + panic("reflect.StructOf: field " + strconv.Itoa(i) + " has no type") + } + f, fpkgpath := runtimeStructField(field) + ft := f.typ + if ft.kind&kindGCProg != 0 { + hasGCProg = true + } + if fpkgpath != "" { + if pkgpath == "" { + pkgpath = fpkgpath + } else if pkgpath != fpkgpath { + panic("reflect.Struct: fields with different PkgPath " + pkgpath + " and " + fpkgpath) + } + } + name := field.Name + if f.embedded() { + // Embedded field + if field.Type.Kind() == Ptr { + // Embedded ** and *interface{} are illegal + elem := field.Type.Elem() + if k := elem.Kind(); k == Ptr || k == Interface { + panic("reflect.StructOf: illegal anonymous field type " + field.Type.String()) + } + } + switch field.Type.Kind() { + case Interface: + case Ptr: + ptr := (*ptrType)(unsafe.Pointer(ft)) + if unt := ptr.uncommon(); unt != nil { + if i > 0 && unt.mcount > 0 { + // Issue 15924. + panic("reflect: embedded type with methods not implemented if type is not first field") + } + if len(fields) > 1 { + panic("reflect: embedded type with methods not implemented if there is more than one field") + } + } + default: + if unt := ft.uncommon(); unt != nil { + if i > 0 && unt.mcount > 0 { + // Issue 15924. + panic("reflect: embedded type with methods not implemented if type is not first field") + } + if len(fields) > 1 && ft.kind&kindDirectIface != 0 { + panic("reflect: embedded type with methods not implemented for non-pointer type") + } + } + } + } + + if _, dup := fset[name]; dup && name != "_" { + panic("reflect.StructOf: duplicate field " + name) + } + fset[name] = struct{}{} + // To be consistent with Compiler's behavior we need to avoid externalizing + // the "name" property. The line below is effectively an inverse of the + // internalStr() function. + jsf := js.InternalObject(struct{ name string }{name}) + // The rest is set through the js.Object() interface, which the compiler will + // externalize for us. + jsf.Set("prop", name) + jsf.Set("exported", f.name.isExported()) + jsf.Set("typ", jsType(field.Type)) + jsf.Set("tag", field.Tag) + jsf.Set("embedded", field.Anonymous) + jsFields[i] = jsf + } + _ = hasGCProg + typ := js.Global.Call("$structType", "", jsFields) + if pkgpath != "" { + typ.Set("pkgPath", pkgpath) + } + return reflectType(typ) +} func Zero(typ Type) Value { return makeValue(typ, jsType(typ).Call("zero"), 0) @@ -467,12 +572,27 @@ func MakeFunc(typ Type, fn func(args []Value) (results []Value)) Value { ftyp := (*funcType)(unsafe.Pointer(t)) fv := js.MakeFunc(func(this *js.Object, arguments []*js.Object) interface{} { + // Convert raw JS arguments into []Value the user-supplied function expects. args := make([]Value, ftyp.NumIn()) for i := range args { argType := ftyp.In(i).common() args[i] = makeValue(argType, arguments[i], 0) } + + // Call the user-supplied function. resultsSlice := fn(args) + + // Verify that returned value types are compatible with the function type specified by the caller. + if want, got := ftyp.NumOut(), len(resultsSlice); want != got { + panic("reflect: expected " + strconv.Itoa(want) + " return values, got " + strconv.Itoa(got)) + } + for i, rtyp := range ftyp.out() { + if !resultsSlice[i].Type().AssignableTo(rtyp) { + panic("reflect: " + strconv.Itoa(i) + " return value type is not compatible with the function declaration") + } + } + + // Rearrange return values according to the expected function signature. switch ftyp.NumOut() { case 0: return nil @@ -504,21 +624,24 @@ func makechan(typ *rtype, size int) (ch unsafe.Pointer) { } func makemap(t *rtype, cap int) (m unsafe.Pointer) { - return unsafe.Pointer(js.Global.Get("Object").New().Unsafe()) + return unsafe.Pointer(js.Global.Get("Map").New().Unsafe()) } -func keyFor(t *rtype, key unsafe.Pointer) (*js.Object, string) { +func keyFor(t *rtype, key unsafe.Pointer) (*js.Object, *js.Object) { kv := js.InternalObject(key) if kv.Get("$get") != js.Undefined { kv = kv.Call("$get") } - k := jsType(t.Key()).Call("keyFor", kv).String() + k := jsType(t.Key()).Call("keyFor", kv) return kv, k } func mapaccess(t *rtype, m, key unsafe.Pointer) unsafe.Pointer { + if !js.InternalObject(m).Bool() { + return nil // nil map + } _, k := keyFor(t, key) - entry := js.InternalObject(m).Get(k) + entry := js.InternalObject(m).Call("get", k) if entry == js.Undefined { return nil } @@ -537,30 +660,54 @@ func mapassign(t *rtype, m, key, val unsafe.Pointer) { entry := js.Global.Get("Object").New() entry.Set("k", kv) entry.Set("v", jsVal) - js.InternalObject(m).Set(k, entry) + js.InternalObject(m).Call("set", k, entry) } func mapdelete(t *rtype, m unsafe.Pointer, key unsafe.Pointer) { _, k := keyFor(t, key) - js.InternalObject(m).Delete(k) + if !js.InternalObject(m).Bool() { + return // nil map + } + js.InternalObject(m).Call("delete", k) } -type mapIter struct { +// TODO(nevkonatkte): The following three "faststr" implementations are meant to +// perform better for the common case of string-keyed maps (see upstream: +// https://github.com/golang/go/commit/23832ba2e2fb396cda1dacf3e8afcb38ec36dcba) +// However, the stubs below will perform the same or worse because of the extra +// string-to-pointer conversion. Not sure how to fix this without significant +// code duplication, however. + +func mapaccess_faststr(t *rtype, m unsafe.Pointer, key string) (val unsafe.Pointer) { + return mapaccess(t, m, unsafe.Pointer(&key)) +} + +func mapassign_faststr(t *rtype, m unsafe.Pointer, key string, val unsafe.Pointer) { + mapassign(t, m, unsafe.Pointer(&key), val) +} + +func mapdelete_faststr(t *rtype, m unsafe.Pointer, key string) { + mapdelete(t, m, unsafe.Pointer(&key)) +} + +type hiter struct { t Type - m *js.Object + m *js.Object // Underlying map object. keys *js.Object i int - // last is the last object the iterator indicates. If this object exists, the functions that return the - // current key or value returns this object, regardless of the current iterator. It is because the current - // iterator might be stale due to key deletion in a loop. + // last is the last object the iterator indicates. If this object exists, the + // functions that return the current key or value returns this object, + // regardless of the current iterator. It is because the current iterator + // might be stale due to key deletion in a loop. last *js.Object } -func (iter *mapIter) skipUntilValidKey() { +func (iter *hiter) skipUntilValidKey() { for iter.i < iter.keys.Length() { k := iter.keys.Index(iter.i) - if iter.m.Get(k.String()) != js.Undefined { + entry := iter.m.Call("get", k) + if entry != js.Undefined { break } // The key is already deleted. Move on the next item. @@ -568,58 +715,70 @@ func (iter *mapIter) skipUntilValidKey() { } } -func mapiterinit(t *rtype, m unsafe.Pointer) unsafe.Pointer { - return unsafe.Pointer(&mapIter{t, js.InternalObject(m), js.Global.Call("$keys", js.InternalObject(m)), 0, nil}) +func mapiterinit(t *rtype, m unsafe.Pointer, it *hiter) { + mapObj := js.InternalObject(m) + keys := js.Global.Get("Array").New() + if mapObj.Get("keys") != js.Undefined { + keysIter := mapObj.Call("keys") + if mapObj.Get("keys") != js.Undefined { + keys = js.Global.Get("Array").Call("from", keysIter) + } + } + + *it = hiter{ + t: t, + m: mapObj, + keys: keys, + i: 0, + last: nil, + } } -func mapiterkey(it unsafe.Pointer) unsafe.Pointer { - iter := (*mapIter)(it) +func mapiterkey(it *hiter) unsafe.Pointer { var kv *js.Object - if iter.last != nil { - kv = iter.last + if it.last != nil { + kv = it.last } else { - iter.skipUntilValidKey() - if iter.i == iter.keys.Length() { + it.skipUntilValidKey() + if it.i == it.keys.Length() { return nil } - k := iter.keys.Index(iter.i) - kv = iter.m.Get(k.String()) + k := it.keys.Index(it.i) + kv = it.m.Call("get", k) // Record the key-value pair for later accesses. - iter.last = kv + it.last = kv } - return unsafe.Pointer(js.Global.Call("$newDataPointer", kv.Get("k"), jsType(PtrTo(iter.t.Key()))).Unsafe()) + return unsafe.Pointer(js.Global.Call("$newDataPointer", kv.Get("k"), jsType(PtrTo(it.t.Key()))).Unsafe()) } -func mapitervalue(it unsafe.Pointer) unsafe.Pointer { - iter := (*mapIter)(it) +func mapiterelem(it *hiter) unsafe.Pointer { var kv *js.Object - if iter.last != nil { - kv = iter.last + if it.last != nil { + kv = it.last } else { - iter.skipUntilValidKey() - if iter.i == iter.keys.Length() { + it.skipUntilValidKey() + if it.i == it.keys.Length() { return nil } - k := iter.keys.Index(iter.i) - kv = iter.m.Get(k.String()) - iter.last = kv + k := it.keys.Index(it.i) + kv = it.m.Call("get", k) + it.last = kv } - return unsafe.Pointer(js.Global.Call("$newDataPointer", kv.Get("v"), jsType(PtrTo(iter.t.Elem()))).Unsafe()) + return unsafe.Pointer(js.Global.Call("$newDataPointer", kv.Get("v"), jsType(PtrTo(it.t.Elem()))).Unsafe()) } -func mapiternext(it unsafe.Pointer) { - iter := (*mapIter)(it) - iter.last = nil - iter.i++ +func mapiternext(it *hiter) { + it.last = nil + it.i++ } func maplen(m unsafe.Pointer) int { - return js.Global.Call("$keys", js.InternalObject(m)).Length() + return js.InternalObject(m).Get("size").Int() } func cvtDirect(v Value, typ Type) Value { - var srcVal = v.object() + srcVal := v.object() if srcVal == jsType(v.typ).Get("nil") { return makeValue(typ, jsType(typ).Get("nil"), v.flag) } @@ -633,20 +792,26 @@ func cvtDirect(v Value, typ Type) Value { slice.Set("$capacity", srcVal.Get("$capacity")) val = js.Global.Call("$newDataPointer", slice, jsType(PtrTo(typ))) case Ptr: - if typ.Elem().Kind() == Struct { + switch typ.Elem().Kind() { + case Struct: if typ.Elem() == v.typ.Elem() { val = srcVal break } val = jsType(typ).New() copyStruct(val, srcVal, typ.Elem()) - break + case Array: + // Unlike other pointers, array pointers are "wrapped" types (see + // isWrapped() in the compiler package), and are represented by a native + // javascript array object here. + val = srcVal + default: + val = jsType(typ).New(srcVal.Get("$get"), srcVal.Get("$set")) } - val = jsType(typ).New(srcVal.Get("$get"), srcVal.Get("$set")) case Struct: val = jsType(typ).Get("ptr").New() copyStruct(val, srcVal, typ) - case Array, Bool, Chan, Func, Interface, Map, String: + case Array, Bool, Chan, Func, Interface, Map, String, UnsafePointer: val = js.InternalObject(v.ptr) default: panic(&ValueError{"reflect.Convert", k}) @@ -654,6 +819,19 @@ func cvtDirect(v Value, typ Type) Value { return Value{typ.common(), unsafe.Pointer(val.Unsafe()), v.flag.ro() | v.flag&flagIndir | flag(typ.Kind())} } +// convertOp: []T -> *[N]T +func cvtSliceArrayPtr(v Value, t Type) Value { + slice := v.object() + + slen := slice.Get("$length").Int() + alen := t.Elem().Len() + if alen > slen { + panic("reflect: cannot convert slice with length " + itoa.Itoa(slen) + " to pointer to array with length " + itoa.Itoa(alen)) + } + array := js.Global.Call("$sliceToGoArray", slice, jsType(t)) + return Value{t.common(), unsafe.Pointer(array.Unsafe()), v.flag&^(flagIndir|flagAddr|flagKindMask) | flag(Ptr)} +} + func Copy(dst, src Value) int { dk := dst.kind() if dk != Array && dk != Slice { @@ -739,6 +917,11 @@ func valueInterface(v Value, safe bool) interface{} { } if isWrapped(v.typ) { + if v.flag&flagIndir != 0 && v.Kind() == Struct { + cv := jsType(v.typ).Call("zero") + copyStruct(cv, v.object(), v.typ) + return interface{}(unsafe.Pointer(jsType(v.typ).New(cv).Unsafe())) + } return interface{}(unsafe.Pointer(jsType(v.typ).New(v.object()).Unsafe())) } return interface{}(unsafe.Pointer(v.object().Unsafe())) @@ -748,10 +931,6 @@ func ifaceE2I(t *rtype, src interface{}, dst unsafe.Pointer) { js.InternalObject(dst).Call("$set", js.InternalObject(src)) } -func methodName() string { - return "?FIXME?" -} - func makeMethodValue(op string, v Value) Value { if v.flag&flagMethod == 0 { panic("reflect: internal error: invalid use of makePartialFunc") @@ -1000,6 +1179,11 @@ func (v Value) Cap() int { return v.typ.Len() case Chan, Slice: return v.object().Get("$capacity").Int() + case Ptr: + if v.typ.Elem().Kind() == Array { + return v.typ.Elem().Len() + } + panic("reflect: call of reflect.Value.Cap on ptr to non-array Value") } panic(&ValueError{"reflect.Value.Cap", k}) } @@ -1225,7 +1409,12 @@ func (v Value) Len() int { case Chan: return v.object().Get("$buffer").Get("length").Int() case Map: - return js.Global.Call("$keys", v.object()).Length() + return v.object().Get("size").Int() + case Ptr: + if v.typ.Elem().Kind() == Array { + return v.typ.Elem().Len() + } + panic("reflect: call of reflect.Value.Len on ptr to non-array Value") default: panic(&ValueError{"reflect.Value.Len", k}) } @@ -1259,12 +1448,10 @@ func (v Value) Set(x Value) { x = x.assignTo("reflect.Set", v.typ, nil) if v.flag&flagIndir != 0 { switch v.typ.Kind() { - case Array: + case Array, Struct: jsType(v.typ).Call("copy", js.InternalObject(v.ptr), js.InternalObject(x.ptr)) case Interface: js.InternalObject(v.ptr).Call("$set", js.InternalObject(valueInterface(x, false))) - case Struct: - copyStruct(js.InternalObject(v.ptr), js.InternalObject(x.ptr), v.typ) default: js.InternalObject(v.ptr).Call("$set", x.object()) } @@ -1273,6 +1460,29 @@ func (v Value) Set(x Value) { v.ptr = x.ptr } +func (v Value) bytesSlow() []byte { + switch v.kind() { + case Slice: + if v.typ.Elem().Kind() != Uint8 { + panic("reflect.Value.Bytes of non-byte slice") + } + return *(*[]byte)(v.ptr) + case Array: + if v.typ.Elem().Kind() != Uint8 { + panic("reflect.Value.Bytes of non-byte array") + } + if !v.CanAddr() { + panic("reflect.Value.Bytes of unaddressable byte array") + } + // Replace the following with JS to avoid using unsafe pointers. + // p := (*byte)(v.ptr) + // n := int((*arrayType)(unsafe.Pointer(v.typ)).len) + // return unsafe.Slice(p, n) + return js.InternalObject(v.ptr).Interface().([]byte) + } + panic(&ValueError{"reflect.Value.Bytes", v.kind()}) +} + func (v Value) SetBytes(x []byte) { v.mustBeAssignable() v.mustBe(Slice) @@ -1498,7 +1708,7 @@ func deepValueEqualJs(v1, v2 Value, visited [][2]unsafe.Pointer) bool { return true } } - var n = v1.Len() + n := v1.Len() if n != v2.Len() { return false } @@ -1516,7 +1726,7 @@ func deepValueEqualJs(v1, v2 Value, visited [][2]unsafe.Pointer) bool { case Ptr: return deepValueEqualJs(v1.Elem(), v2.Elem(), visited) case Struct: - var n = v1.NumField() + n := v1.NumField() for i := 0; i < n; i++ { if !deepValueEqualJs(v1.Field(i), v2.Field(i), visited) { return false @@ -1530,7 +1740,7 @@ func deepValueEqualJs(v1, v2 Value, visited [][2]unsafe.Pointer) bool { if v1.object() == v2.object() { return true } - var keys = v1.MapKeys() + keys := v1.MapKeys() if len(keys) != v2.Len() { return false } @@ -1550,3 +1760,55 @@ func deepValueEqualJs(v1, v2 Value, visited [][2]unsafe.Pointer) bool { return js.Global.Call("$interfaceIsEqual", js.InternalObject(valueInterface(v1, false)), js.InternalObject(valueInterface(v2, false))).Bool() } + +func stringsLastIndex(s string, c byte) int { + for i := len(s) - 1; i >= 0; i-- { + if s[i] == c { + return i + } + } + return -1 +} + +func stringsHasPrefix(s, prefix string) bool { + return len(s) >= len(prefix) && s[:len(prefix)] == prefix +} + +func valueMethodName() string { + var pc [5]uintptr + n := runtime.Callers(1, pc[:]) + frames := runtime.CallersFrames(pc[:n]) + valueTyp := TypeOf(Value{}) + var frame runtime.Frame + for more := true; more; { + frame, more = frames.Next() + name := frame.Function + // Function name extracted from the call stack can be different from + // vanilla Go, so is not prefixed by "reflect.Value." as needed by the original. + // See https://cs.opensource.google/go/go/+/refs/tags/go1.19.13:src/reflect/value.go;l=173-191 + // This workaround may become obsolete after + // https://github.com/gopherjs/gopherjs/issues/1085 is resolved. + + methodName := name + if idx := stringsLastIndex(name, '.'); idx >= 0 { + methodName = name[idx+1:] + } + + // Since function name in the call stack doesn't contain receiver name, + // we are looking for the first exported function name that matches a + // known Value method. + if _, ok := valueTyp.MethodByName(methodName); ok { + if len(methodName) > 0 && 'A' <= methodName[0] && methodName[0] <= 'Z' { + return `reflect.Value.` + methodName + } + } + } + return "unknown method" +} + +func verifyNotInHeapPtr(p uintptr) bool { + // Go runtime uses this method to make sure that a uintptr won't crash GC if + // interpreted as a heap pointer. This is not relevant for GopherJS, so we can + // always return true. + return true +} diff --git a/compiler/natives/src/reflect/reflect_test.go b/compiler/natives/src/reflect/reflect_test.go index 878a685cc..4c0bcd0be 100644 --- a/compiler/natives/src/reflect/reflect_test.go +++ b/compiler/natives/src/reflect/reflect_test.go @@ -1,10 +1,11 @@ +//go:build js // +build js package reflect_test import ( "math" - "reflect" + . "reflect" "testing" ) @@ -45,54 +46,34 @@ func TestOffsetLock(t *testing.T) { } func TestSelectOnInvalid(t *testing.T) { - reflect.Select([]reflect.SelectCase{ + Select([]SelectCase{ { - Dir: reflect.SelectRecv, - Chan: reflect.Value{}, + Dir: SelectRecv, + Chan: Value{}, }, { - Dir: reflect.SelectSend, - Chan: reflect.Value{}, - Send: reflect.ValueOf(1), + Dir: SelectSend, + Chan: Value{}, + Send: ValueOf(1), }, { - Dir: reflect.SelectDefault, + Dir: SelectDefault, }, }) } -func TestStructOfFieldName(t *testing.T) { - t.Skip("StructOf") -} - -func TestStructOf(t *testing.T) { - t.Skip("StructOf") -} - -func TestStructOfExportRules(t *testing.T) { - t.Skip("StructOf") -} - -func TestStructOfGC(t *testing.T) { - t.Skip("StructOf") -} - -func TestStructOfAlg(t *testing.T) { - t.Skip("StructOf") -} - -func TestStructOfGenericAlg(t *testing.T) { - t.Skip("StructOf") -} - func TestStructOfDirectIface(t *testing.T) { - t.Skip("StructOf") + t.Skip("reflect.Value.InterfaceData is not supported by GopherJS.") } func TestStructOfWithInterface(t *testing.T) { - t.Skip("StructOf") -} - -func TestStructOfTooManyFields(t *testing.T) { - t.Skip("StructOf") + // TODO(nevkontakte) Most of this test actually passes, but there is something + // about embedding fields with methods that can or can't be stored in an + // interface value directly that GopherJS does differently from upstream. As + // a result, GopherJS's implementation of StructOf() doesn't panic where + // upstream does. It seems to be a result of our implementation not propagating + // the kindDirectIface flag in struct types created by StructOf(), but at this + // point I wasn't able to figure out what that flag actually means in the + // GopherJS context or how it maps onto our own reflection implementation. + t.Skip("GopherJS doesn't support storing types directly in interfaces.") } var deepEqualTests = []DeepEqualTest{ @@ -163,7 +144,7 @@ var deepEqualTests = []DeepEqualTest{ // TODO: Fix this. See https://github.com/gopherjs/gopherjs/issues/763. func TestIssue22073(t *testing.T) { - m := reflect.ValueOf(NonExportedFirst(0)).Method(0) + m := ValueOf(NonExportedFirst(0)).Method(0) if got := m.Type().NumOut(); got != 0 { t.Errorf("NumOut: got %v, want 0", got) @@ -176,7 +157,7 @@ func TestIssue22073(t *testing.T) { // TypeError: Cannot read property 'apply' of undefined // Shouldn't panic. - //m.Call(nil) + // m.Call(nil) } func TestCallReturnsEmpty(t *testing.T) { @@ -187,3 +168,153 @@ func init() { // TODO: This is a failure in 1.11, try to determine the cause and fix. typeTests = append(typeTests[:31], typeTests[32:]...) // skip test case #31 } + +func TestConvertNaNs(t *testing.T) { + // This test is exactly the same as the upstream, except it uses a "quiet NaN" + // value instead of "signalling NaN". JavaScript appears to coerce all NaNs + // into quiet ones, but for the purpose of this test either is fine. + + const qnan uint32 = 0x7fc00001 // Originally: 0x7f800001. + type myFloat32 float32 + x := V(myFloat32(math.Float32frombits(qnan))) + y := x.Convert(TypeOf(float32(0))) + z := y.Interface().(float32) + if got := math.Float32bits(z); got != qnan { + t.Errorf("quiet nan conversion got %x, want %x", got, qnan) + } +} + +func TestMapIterSet(t *testing.T) { + m := make(map[string]any, len(valueTests)) + for _, tt := range valueTests { + m[tt.s] = tt.i + } + v := ValueOf(m) + + k := New(v.Type().Key()).Elem() + e := New(v.Type().Elem()).Elem() + + iter := v.MapRange() + for iter.Next() { + k.SetIterKey(iter) + e.SetIterValue(iter) + want := m[k.String()] + got := e.Interface() + if got != want { + t.Errorf("%q: want (%T) %v, got (%T) %v", k.String(), want, want, got, got) + } + if setkey, key := valueToString(k), valueToString(iter.Key()); setkey != key { + t.Errorf("MapIter.Key() = %q, MapIter.SetKey() = %q", key, setkey) + } + if setval, val := valueToString(e), valueToString(iter.Value()); setval != val { + t.Errorf("MapIter.Value() = %q, MapIter.SetValue() = %q", val, setval) + } + } + + // Upstream test also tests allocations made by the iterator. GopherJS doesn't + // support runtime.ReadMemStats(), so we leave that part out. +} + +type inner struct { + x int +} + +type outer struct { + y int + inner +} + +func (*inner) M() int { return 1 } +func (*outer) M() int { return 2 } + +func TestNestedMethods(t *testing.T) { + // This test is similar to the upstream, but avoids using the unsupported + // Value.UnsafePointer() method. + typ := TypeOf((*outer)(nil)) + args := []Value{ + ValueOf((*outer)(nil)), // nil receiver + } + if typ.NumMethod() != 1 { + t.Errorf("Wrong method table for outer, found methods:") + for i := 0; i < typ.NumMethod(); i++ { + m := typ.Method(i) + t.Errorf("\t%d: %s\n", i, m.Name) + } + } + if got := typ.Method(0).Func.Call(args)[0]; got.Int() != 2 { + t.Errorf("Wrong method table for outer, expected return value 2, got: %v", got) + } + if got := ValueOf((*outer).M).Call(args)[0]; got.Int() != 2 { + t.Errorf("Wrong method table for outer, expected return value 2, got: %v", got) + } +} + +func TestEmbeddedMethods(t *testing.T) { + // This test is similar to the upstream, but avoids using the unsupported + // Value.UnsafePointer() method. + typ := TypeOf((*OuterInt)(nil)) + if typ.NumMethod() != 1 { + t.Errorf("Wrong method table for OuterInt: (m=%p)", (*OuterInt).M) + for i := 0; i < typ.NumMethod(); i++ { + m := typ.Method(i) + t.Errorf("\t%d: %s %p\n", i, m.Name, m.Func.UnsafePointer()) + } + } + + i := &InnerInt{3} + if v := ValueOf(i).Method(0).Call(nil)[0].Int(); v != 3 { + t.Errorf("i.M() = %d, want 3", v) + } + + o := &OuterInt{1, InnerInt{2}} + if v := ValueOf(o).Method(0).Call(nil)[0].Int(); v != 2 { + t.Errorf("i.M() = %d, want 2", v) + } + + f := (*OuterInt).M + if v := f(o); v != 2 { + t.Errorf("f(o) = %d, want 2", v) + } +} + +func TestNotInHeapDeref(t *testing.T) { + t.Skip("GopherJS doesn't support //go:notinheap") +} + +func TestMethodCallValueCodePtr(t *testing.T) { + t.Skip("methodValueCallCodePtr() is not applicable in GopherJS") +} + +//gopherjs:purge for go1.19 without generics +type ( + A struct{} + B[T any] struct{} +) + +func TestIssue50208(t *testing.T) { + t.Skip("This test required generics, which are not yet supported: https://github.com/gopherjs/gopherjs/issues/1013") +} + +func TestStructOfTooLarge(t *testing.T) { + t.Skip("This test is dependent on field alignment to determine if a struct size would exceed virtual address space.") +} + +func TestSetLenCap(t *testing.T) { + t.Skip("Test depends on call stack function names: https://github.com/gopherjs/gopherjs/issues/1085") +} + +func TestSetPanic(t *testing.T) { + t.Skip("Test depends on call stack function names: https://github.com/gopherjs/gopherjs/issues/1085") +} + +func TestCallPanic(t *testing.T) { + t.Skip("Test depends on call stack function names: https://github.com/gopherjs/gopherjs/issues/1085") +} + +func TestValuePanic(t *testing.T) { + t.Skip("Test depends on call stack function names: https://github.com/gopherjs/gopherjs/issues/1085") +} + +func TestSetIter(t *testing.T) { + t.Skip("Test depends on call stack function names: https://github.com/gopherjs/gopherjs/issues/1085") +} diff --git a/compiler/natives/src/reflect/swapper.go b/compiler/natives/src/reflect/swapper.go index a94f7961e..068f984ed 100644 --- a/compiler/natives/src/reflect/swapper.go +++ b/compiler/natives/src/reflect/swapper.go @@ -1,3 +1,4 @@ +//go:build js // +build js package reflect diff --git a/compiler/natives/src/regexp/regexp_test.go b/compiler/natives/src/regexp/regexp_test.go index 823aec6fe..3a2d58d32 100644 --- a/compiler/natives/src/regexp/regexp_test.go +++ b/compiler/natives/src/regexp/regexp_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package regexp @@ -6,6 +7,14 @@ import ( "testing" ) +//gopherjs:keep-original func TestOnePassCutoff(t *testing.T) { - t.Skip() // "Maximum call stack size exceeded" on V8 + defer func() { + if r := recover(); r != nil { + t.Log(r) + t.Skip("'Maximum call stack size exceeded' may happen on V8, skipping") + } + }() + + _gopherjs_original_TestOnePassCutoff(t) } diff --git a/compiler/natives/src/runtime/debug/debug.go b/compiler/natives/src/runtime/debug/debug.go index 6597dcc45..b45da62bb 100644 --- a/compiler/natives/src/runtime/debug/debug.go +++ b/compiler/natives/src/runtime/debug/debug.go @@ -1,3 +1,4 @@ +//go:build js // +build js package debug diff --git a/compiler/natives/src/runtime/fastrand.go b/compiler/natives/src/runtime/fastrand.go new file mode 100644 index 000000000..a5f2bdbb8 --- /dev/null +++ b/compiler/natives/src/runtime/fastrand.go @@ -0,0 +1,27 @@ +//go:build js +// +build js + +package runtime + +import "github.com/gopherjs/gopherjs/js" + +func fastrand() uint32 { + // In the upstream this function is implemented with a + // custom algorithm that uses bit manipulation, but it is likely to be slower + // than calling Math.random(). + // TODO(nevkontakte): We should verify that it actually is faster and has a + // similar distribution. + return uint32(js.Global.Get("Math").Call("random").Float() * (1<<32 - 1)) +} + +func fastrandn(n uint32) uint32 { + return fastrand() % n +} + +func fastrand64() uint64 { + return uint64(fastrand())<<32 | uint64(fastrand()) +} + +func fastrandu() uint { + return uint(fastrand()) +} diff --git a/compiler/natives/src/runtime/pprof/pprof.go b/compiler/natives/src/runtime/pprof/pprof.go index 8af83a907..f398ca21b 100644 --- a/compiler/natives/src/runtime/pprof/pprof.go +++ b/compiler/natives/src/runtime/pprof/pprof.go @@ -1,3 +1,4 @@ +//go:build js // +build js package pprof diff --git a/compiler/natives/src/runtime/runtime.go b/compiler/natives/src/runtime/runtime.go index 3239b182f..9f8425af8 100644 --- a/compiler/natives/src/runtime/runtime.go +++ b/compiler/natives/src/runtime/runtime.go @@ -1,30 +1,71 @@ +//go:build js // +build js package runtime import ( - "runtime/internal/sys" - "github.com/gopherjs/gopherjs/js" ) -const GOOS = sys.GOOS -const GOARCH = "js" -const Compiler = "gopherjs" +const ( + GOOS = "js" + GOARCH = "ecmascript" + Compiler = "gopherjs" +) -// fake for error.go -type eface struct { - _type *_type -} -type _type struct { - str string +// The Error interface identifies a run time error. +type Error interface { + error + + // RuntimeError is a no-op function but + // serves to distinguish types that are run time + // errors from ordinary errors: a type is a + // run time error if it has a RuntimeError method. + RuntimeError() } -func (t *_type) string() string { - return t.str +// TODO(nevkontakte): In the upstream, this struct is meant to be compatible +// with reflect.rtype, but here we use a minimal stub that satisfies the API +// TypeAssertionError expects, which we dynamically instantiate in $assertType(). +type _type struct{ str string } + +func (t *_type) string() string { return t.str } +func (t *_type) pkgpath() string { return "" } + +// A TypeAssertionError explains a failed type assertion. +type TypeAssertionError struct { + _interface *_type + concrete *_type + asserted *_type + missingMethod string // one method needed by Interface, missing from Concrete } -func (t *_type) pkgpath() string { - return "" + +func (*TypeAssertionError) RuntimeError() {} + +func (e *TypeAssertionError) Error() string { + inter := "interface" + if e._interface != nil { + inter = e._interface.string() + } + as := e.asserted.string() + if e.concrete == nil { + return "interface conversion: " + inter + " is nil, not " + as + } + cs := e.concrete.string() + if e.missingMethod == "" { + msg := "interface conversion: " + inter + " is " + cs + ", not " + as + if cs == as { + // provide slightly clearer error message + if e.concrete.pkgpath() != e.asserted.pkgpath() { + msg += " (types from different packages)" + } else { + msg += " (types from different scopes)" + } + } + return msg + } + return "interface conversion: " + cs + " is not " + as + + ": missing method " + e.missingMethod } func init() { @@ -32,6 +73,7 @@ func init() { js.Global.Set("$jsObjectPtr", jsPkg.Get("Object").Get("ptr")) js.Global.Set("$jsErrorPtr", jsPkg.Get("Error").Get("ptr")) js.Global.Set("$throwRuntimeError", js.InternalObject(throw)) + buildVersion = js.Global.Get("$goVersion").String() // avoid dead code elimination var e error e = &TypeAssertionError{} @@ -40,13 +82,13 @@ func init() { func GOROOT() string { process := js.Global.Get("process") - if process == js.Undefined { + if process == js.Undefined || process.Get("env") == js.Undefined { return "/" } - if v := process.Get("env").Get("GOPHERJS_GOROOT"); v != js.Undefined { + if v := process.Get("env").Get("GOPHERJS_GOROOT"); v != js.Undefined && v.String() != "" { // GopherJS-specific GOROOT value takes precedence. return v.String() - } else if v := process.Get("env").Get("GOROOT"); v != js.Undefined { + } else if v := process.Get("env").Get("GOROOT"); v != js.Undefined && v.String() != "" { return v.String() } // sys.DefaultGoroot is now gone, can't use it as fallback anymore. @@ -54,30 +96,212 @@ func GOROOT() string { return "/usr/local/go" } -func Breakpoint() { - js.Debugger() +func Breakpoint() { js.Debugger() } + +var ( + // JavaScript runtime doesn't provide access to low-level execution position + // counters, so we emulate them by recording positions we've encountered in + // Caller() and Callers() functions and assigning them arbitrary integer values. + // + // We use the map and the slice below to convert a "file:line" position + // into an integer position counter and then to a Func instance. + knownPositions = map[string]uintptr{} + positionCounters = []*Func{} +) + +func registerPosition(funcName string, file string, line int, col int) uintptr { + key := file + ":" + itoa(line) + ":" + itoa(col) + if pc, found := knownPositions[key]; found { + return pc + } + f := &Func{ + name: funcName, + file: file, + line: line, + } + pc := uintptr(len(positionCounters)) + positionCounters = append(positionCounters, f) + knownPositions[key] = pc + return pc +} + +// itoa converts an integer to a string. +// +// Can't use strconv.Itoa() in the `runtime` package due to a cyclic dependency. +func itoa(i int) string { + return js.Global.Get("String").New(i).String() +} + +// basicFrame contains stack trace information extracted from JS stack trace. +type basicFrame struct { + FuncName string + File string + Line int + Col int +} + +func callstack(skip, limit int) []basicFrame { + skip = skip + 1 /*skip error message*/ + 1 /*skip callstack's own frame*/ + lines := js.Global.Get("Error").New().Get("stack").Call("split", "\n").Call("slice", skip, skip+limit) + return parseCallstack(lines) +} + +var ( + // These functions are GopherJS-specific and don't have counterparts in + // upstream Go runtime. To improve interoperability, we filter them out from + // the stack trace. + hiddenFrames = map[string]bool{ + "$callDeferred": true, + } + // The following GopherJS prelude functions have differently-named + // counterparts in the upstream Go runtime. Some standard library code relies + // on the names matching, so we perform this substitution. + knownFrames = map[string]string{ + "$panic": "runtime.gopanic", + "$goroutine": "runtime.goexit", + } +) + +func parseCallstack(lines *js.Object) []basicFrame { + frames := []basicFrame{} + l := lines.Length() + for i := 0; i < l; i++ { + frame := ParseCallFrame(lines.Index(i)) + if hiddenFrames[frame.FuncName] { + continue + } + if alias, ok := knownFrames[frame.FuncName]; ok { + frame.FuncName = alias + } + frames = append(frames, frame) + if frame.FuncName == "runtime.goexit" { + break // We've reached the bottom of the goroutine stack. + } + } + return frames +} + +// ParseCallFrame is exported for the sake of testing. See this discussion for context https://github.com/gopherjs/gopherjs/pull/1097/files/561e6381406f04ccb8e04ef4effedc5c7887b70f#r776063799 +// +// TLDR; never use this function! +func ParseCallFrame(info *js.Object) basicFrame { + // FireFox + if info.Call("indexOf", "@").Int() >= 0 { + split := js.Global.Get("RegExp").New("[@:]") + parts := info.Call("split", split) + return basicFrame{ + File: parts.Call("slice", 1, parts.Length()-2).Call("join", ":").String(), + Line: parts.Index(parts.Length() - 2).Int(), + Col: parts.Index(parts.Length() - 1).Int(), + FuncName: parts.Index(0).String(), + } + } + + // Chrome / Node.js + openIdx := info.Call("lastIndexOf", "(").Int() + if openIdx == -1 { + parts := info.Call("split", ":") + + return basicFrame{ + File: parts.Call("slice", 0, parts.Length()-2).Call("join", ":"). + Call("replace", js.Global.Get("RegExp").New(`^\s*at `), "").String(), + Line: parts.Index(parts.Length() - 2).Int(), + Col: parts.Index(parts.Length() - 1).Int(), + FuncName: "", + } + } + + var file, funcName string + var line, col int + + pos := info.Call("substring", openIdx+1, info.Call("indexOf", ")").Int()) + parts := pos.Call("split", ":") + + if pos.String() == "" { + file = "" + } else { + file = parts.Call("slice", 0, parts.Length()-2).Call("join", ":").String() + line = parts.Index(parts.Length() - 2).Int() + col = parts.Index(parts.Length() - 1).Int() + } + fn := info.Call("substring", info.Call("indexOf", "at ").Int()+3, info.Call("indexOf", " (").Int()) + if idx := fn.Call("indexOf", "[as ").Int(); idx > 0 { + fn = fn.Call("substring", idx+4, fn.Call("indexOf", "]")) + } + funcName = fn.String() + + return basicFrame{ + File: file, + Line: line, + Col: col, + FuncName: funcName, + } } func Caller(skip int) (pc uintptr, file string, line int, ok bool) { - info := js.Global.Get("Error").New().Get("stack").Call("split", "\n").Index(skip + 2) - if info == js.Undefined { + skip = skip + 1 /*skip Caller's own frame*/ + frames := callstack(skip, 1) + if len(frames) != 1 { return 0, "", 0, false } - parts := info.Call("substring", info.Call("indexOf", "(").Int()+1, info.Call("indexOf", ")").Int()).Call("split", ":") - return 0, parts.Index(0).String(), parts.Index(1).Int(), true + pc = registerPosition(frames[0].FuncName, frames[0].File, frames[0].Line, frames[0].Col) + return pc, frames[0].File, frames[0].Line, true } +// Callers fills the slice pc with the return program counters of function +// invocations on the calling goroutine's stack. The argument skip is the number +// of stack frames to skip before recording in pc, with 0 identifying the frame +// for Callers itself and 1 identifying the caller of Callers. It returns the +// number of entries written to pc. +// +// The returned call stack represents the logical Go call stack, which excludes +// certain runtime-internal call frames that would be present in the raw +// JavaScript stack trace. This is done to improve interoperability with the +// upstream Go. Use JavaScript native APIs to access the raw call stack. +// +// To translate these PCs into symbolic information such as function names and +// line numbers, use CallersFrames. CallersFrames accounts for inlined functions +// and adjusts the return program counters into call program counters. Iterating +// over the returned slice of PCs directly is discouraged, as is using FuncForPC +// on any of the returned PCs, since these cannot account for inlining or return +// program counter adjustment. func Callers(skip int, pc []uintptr) int { - return 0 + frames := callstack(skip, len(pc)) + for i, frame := range frames { + pc[i] = registerPosition(frame.FuncName, frame.File, frame.Line, frame.Col) + } + return len(frames) } -// CallersFrames is not implemented for GOARCH=js. -// TODO: Implement if possible. -func CallersFrames(callers []uintptr) *Frames { return &Frames{} } +func CallersFrames(callers []uintptr) *Frames { + result := Frames{} + for _, pc := range callers { + fun := FuncForPC(pc) + result.frames = append(result.frames, Frame{ + PC: pc, + Func: fun, + Function: fun.name, + File: fun.file, + Line: fun.line, + Entry: fun.Entry(), + }) + } + return &result +} -type Frames struct{} +type Frames struct { + frames []Frame + current int +} -func (ci *Frames) Next() (frame Frame, more bool) { return } +func (ci *Frames) Next() (frame Frame, more bool) { + if ci.current >= len(ci.frames) { + return Frame{}, false + } + f := ci.frames[ci.current] + ci.current++ + return f, ci.current < len(ci.frames) +} type Frame struct { PC uintptr @@ -88,17 +312,14 @@ type Frame struct { Entry uintptr } -func GC() { -} +func GC() {} func Goexit() { js.Global.Get("$curGoroutine").Set("exit", true) js.Global.Call("$throw", nil) } -func GOMAXPROCS(n int) int { - return 1 -} +func GOMAXPROCS(int) int { return 1 } func Gosched() { c := make(chan struct{}) @@ -106,9 +327,7 @@ func Gosched() { <-c } -func NumCPU() int { - return 1 -} +func NumCPU() int { return 1 } func NumGoroutine() int { return js.Global.Get("$totalGoroutines").Int() @@ -165,21 +384,50 @@ type MemStats struct { } func ReadMemStats(m *MemStats) { + // TODO(nevkontakte): This function is effectively unimplemented and may + // lead to silent unexpected behaviors. Consider panicing explicitly. } func SetFinalizer(x, f interface{}) { + // TODO(nevkontakte): This function is effectively unimplemented and may + // lead to silent unexpected behaviors. Consider panicing explicitly. } type Func struct { + name string + file string + line int + opaque struct{} // unexported field to disallow conversions } -func (_ *Func) Entry() uintptr { return 0 } -func (_ *Func) FileLine(pc uintptr) (file string, line int) { return "", 0 } -func (_ *Func) Name() string { return "" } +func (_ *Func) Entry() uintptr { return 0 } + +func (f *Func) FileLine(pc uintptr) (file string, line int) { + if f == nil { + return "", 0 + } + return f.file, f.line +} + +func (f *Func) Name() string { + if f == nil || f.name == "" { + return "" + } + return f.name +} func FuncForPC(pc uintptr) *Func { - return nil + ipc := int(pc) + if ipc >= len(positionCounters) { + // Since we are faking position counters, the only valid way to obtain one + // is through a Caller() or Callers() function. If pc is out of positionCounters + // bounds it must have been obtained in some other way, which is unexpected. + // If a panic proves problematic, we can return a nil *Func, which will + // present itself as a generic "unknown" function. + panic("GopherJS: pc=" + itoa(ipc) + " is out of range of known position counters") + } + return positionCounters[ipc] } var MemProfileRate int = 512 * 1024 @@ -192,6 +440,12 @@ func SetMutexProfileFraction(rate int) int { return 0 } +// Stack formats a stack trace of the calling goroutine into buf and returns the +// number of bytes written to buf. If all is true, Stack formats stack traces of +// all other goroutines into buf after the trace for the current goroutine. +// +// Unlike runtime.Callers(), it returns an unprocessed, runtime-specific text +// representation of the JavaScript stack trace. func Stack(buf []byte, all bool) int { s := js.Global.Get("Error").New().Get("stack") if s == js.Undefined { @@ -204,33 +458,37 @@ func LockOSThread() {} func UnlockOSThread() {} +var buildVersion string // Set by init() + func Version() string { - return sys.TheVersion + return buildVersion } func StartTrace() error { return nil } func StopTrace() {} func ReadTrace() []byte -// We fake a cgo environment to catch errors. Therefor we have to implement this and always return 0 +// We fake a cgo environment to catch errors. Therefore we have to implement this and always return 0 func NumCgoCall() int64 { return 0 } -func efaceOf(ep *interface{}) *eface { - panic("efaceOf: not supported") -} - func KeepAlive(interface{}) {} +// An errorString represents a runtime error described by a single string. +type errorString string + +func (e errorString) RuntimeError() {} + +func (e errorString) Error() string { + return "runtime error: " + string(e) +} + func throw(s string) { panic(errorString(s)) } -// These are used by panicwrap. Not implemented for GOARCH=js. -// TODO: Implement if possible. -func getcallerpc() uintptr { return 0 } -func findfunc(pc uintptr) funcInfo { return funcInfo{} } -func funcname(f funcInfo) string { return "" } - -type funcInfo struct{} +func nanotime() int64 { + const millisecond = 1_000_000 + return js.Global.Get("Date").New().Call("getTime").Int64() * millisecond +} diff --git a/compiler/natives/src/strconv/atoi.go b/compiler/natives/src/strconv/atoi.go new file mode 100644 index 000000000..63ea9b732 --- /dev/null +++ b/compiler/natives/src/strconv/atoi.go @@ -0,0 +1,47 @@ +//go:build js +// +build js + +package strconv + +import ( + "github.com/gopherjs/gopherjs/js" +) + +const ( + maxInt32 float64 = 1<<31 - 1 + minInt32 float64 = -1 << 31 +) + +// Atoi returns the result of ParseInt(s, 10, 0) converted to type int. +func Atoi(s string) (int, error) { + const fnAtoi = "Atoi" + if len(s) == 0 { + return 0, syntaxError(fnAtoi, s) + } + // Investigate the bytes of the string + // Validate each byte is allowed in parsing + // Number allows some prefixes that Go does not: "0x" "0b", "0o" + // additionally Number accepts decimals where Go does not "10.2" + for i := 0; i < len(s); i++ { + v := s[i] + + if v < '0' || v > '9' { + if v != '+' && v != '-' { + return 0, syntaxError(fnAtoi, s) + } + } + } + jsValue := js.Global.Call("Number", s, 10) + if !js.Global.Call("isFinite", jsValue).Bool() { + return 0, syntaxError(fnAtoi, s) + } + // Bounds checking + floatval := jsValue.Float() + if floatval > maxInt32 { + return int(maxInt32), rangeError(fnAtoi, s) + } else if floatval < minInt32 { + return int(minInt32), rangeError(fnAtoi, s) + } + // Success! + return jsValue.Int(), nil +} diff --git a/compiler/natives/src/strconv/itoa.go b/compiler/natives/src/strconv/itoa.go new file mode 100644 index 000000000..c5440c78e --- /dev/null +++ b/compiler/natives/src/strconv/itoa.go @@ -0,0 +1,14 @@ +//go:build js +// +build js + +package strconv + +import ( + "github.com/gopherjs/gopherjs/js" +) + +// Itoa in gopherjs is always a 32bit int so the native toString +// always handles it successfully. +func Itoa(i int) string { + return js.InternalObject(i).Call("toString").String() +} diff --git a/compiler/natives/src/strings/strings.go b/compiler/natives/src/strings/strings.go index 09b1bb597..2867872f6 100644 --- a/compiler/natives/src/strings/strings.go +++ b/compiler/natives/src/strings/strings.go @@ -1,3 +1,4 @@ +//go:build js // +build js package strings @@ -65,3 +66,10 @@ func (b *Builder) copyCheck() { panic("strings: illegal use of non-zero Builder copied by value") } } + +func Clone(s string) string { + // Since in the JavaScript runtime we don't have access the string's + // baking memory, we let the engine's garbage collector deal with substring + // memory overheads and simply return the string as-is. + return s +} diff --git a/compiler/natives/src/strings/strings_test.go b/compiler/natives/src/strings/strings_test.go index de6ccff34..fb9a4a57a 100644 --- a/compiler/natives/src/strings/strings_test.go +++ b/compiler/natives/src/strings/strings_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package strings_test @@ -15,3 +16,7 @@ func TestBuilderGrow(t *testing.T) { func TestCompareStrings(t *testing.T) { t.Skip("unsafeString not supported in GopherJS") } + +func TestClone(t *testing.T) { + t.Skip("conversion to reflect.StringHeader is not supported in GopherJS") +} diff --git a/compiler/natives/src/sync/atomic/atomic.go b/compiler/natives/src/sync/atomic/atomic.go index 636017121..1cbfe65f9 100644 --- a/compiler/natives/src/sync/atomic/atomic.go +++ b/compiler/natives/src/sync/atomic/atomic.go @@ -1,3 +1,4 @@ +//go:build js // +build js package atomic @@ -174,12 +175,51 @@ func (v *Value) Load() (x interface{}) { return v.v } -func (v *Value) Store(x interface{}) { - if x == nil { - panic("sync/atomic: store of nil value into Value") +func (v *Value) Store(new interface{}) { + v.checkNew("store", new) + v.v = new +} + +func (v *Value) Swap(new interface{}) (old interface{}) { + v.checkNew("swap", new) + old, v.v = v.v, new + return old +} + +func (v *Value) CompareAndSwap(old, new interface{}) (swapped bool) { + v.checkNew("compare and swap", new) + + if !(v.v == nil && old == nil) && !sameType(old, new) { + panic("sync/atomic: compare and swap of inconsistently typed values into Value") } - if v.v != nil && js.InternalObject(x).Get("constructor") != js.InternalObject(v.v).Get("constructor") { - panic("sync/atomic: store of inconsistently typed value into Value") + + if v.v != old { + return false } - v.v = x + + v.v = new + + return true } + +func (v *Value) checkNew(op string, new interface{}) { + if new == nil { + panic("sync/atomic: " + op + " of nil value into Value") + } + + if v.v != nil && !sameType(new, v.v) { + panic("sync/atomic: " + op + " of inconsistently typed value into Value") + } +} + +// sameType returns true if x and y contain the same concrete Go types. +func sameType(x, y interface{}) bool { + // This relies upon the fact that an interface in GopherJS is represented + // by the instance of the underlying Go type. Primitive values (e.g. bools) + // are still wrapped into a Go type object, so we can rely upon constructors + // existing and differing for different types. + return js.InternalObject(x).Get("constructor") == js.InternalObject(y).Get("constructor") +} + +//gopherjs:purge for go1.19 without generics +type Pointer[T any] struct{} diff --git a/compiler/natives/src/sync/atomic/atomic_test.go b/compiler/natives/src/sync/atomic/atomic_test.go index 9ad30a2c7..e1ec6086c 100644 --- a/compiler/natives/src/sync/atomic/atomic_test.go +++ b/compiler/natives/src/sync/atomic/atomic_test.go @@ -1,9 +1,77 @@ +//go:build js // +build js package atomic_test -import "testing" +import ( + "testing" + "unsafe" +) + +//gopherjs:purge for go1.19 without generics +func testPointers() []unsafe.Pointer {} + +func TestSwapPointer(t *testing.T) { + t.Skip("GopherJS does not support generics yet.") +} + +func TestSwapPointerMethod(t *testing.T) { + t.Skip("GopherJS does not support generics yet.") +} + +func TestCompareAndSwapPointer(t *testing.T) { + t.Skip("GopherJS does not support generics yet.") +} + +func TestCompareAndSwapPointerMethod(t *testing.T) { + t.Skip("GopherJS does not support generics yet.") +} + +func TestLoadPointer(t *testing.T) { + t.Skip("GopherJS does not support generics yet.") +} + +func TestLoadPointerMethod(t *testing.T) { + t.Skip("GopherJS does not support generics yet.") +} + +func TestStorePointer(t *testing.T) { + t.Skip("GopherJS does not support generics yet.") +} + +func TestStorePointerMethod(t *testing.T) { + t.Skip("GopherJS does not support generics yet.") +} + +//gopherjs:purge for go1.19 without generics +func hammerStoreLoadPointer(t *testing.T, paddr unsafe.Pointer) {} + +//gopherjs:purge for go1.19 without generics +func hammerStoreLoadPointerMethod(t *testing.T, paddr unsafe.Pointer) {} func TestHammerStoreLoad(t *testing.T) { t.Skip("use of unsafe") } + +func TestUnaligned64(t *testing.T) { + t.Skip("GopherJS emulates atomics, which makes alignment irrelevant.") +} + +func TestAutoAligned64(t *testing.T) { + t.Skip("GopherJS emulates atomics, which makes alignment irrelevant.") +} + +func TestNilDeref(t *testing.T) { + t.Skip("GopherJS does not support generics yet.") +} + +//gopherjs:purge for go1.19 without generics +type List struct{} + +func TestHammer32(t *testing.T) { + t.Skip("use of unsafe") +} + +func TestHammer64(t *testing.T) { + t.Skip("use of unsafe") +} diff --git a/compiler/natives/src/sync/cond.go b/compiler/natives/src/sync/cond.go index 829dac2ef..916ace8f7 100644 --- a/compiler/natives/src/sync/cond.go +++ b/compiler/natives/src/sync/cond.go @@ -1,3 +1,4 @@ +//go:build js // +build js package sync diff --git a/compiler/natives/src/sync/cond_test.go b/compiler/natives/src/sync/cond_test.go new file mode 100644 index 000000000..3b286ba49 --- /dev/null +++ b/compiler/natives/src/sync/cond_test.go @@ -0,0 +1,10 @@ +//go:build js +// +build js + +package sync_test + +import "testing" + +func TestCondCopy(t *testing.T) { + t.Skip("Copy checker requires raw pointers, which GopherJS doesn't fully support.") +} diff --git a/compiler/natives/src/sync/export_test.go b/compiler/natives/src/sync/export_test.go deleted file mode 100644 index f23a87331..000000000 --- a/compiler/natives/src/sync/export_test.go +++ /dev/null @@ -1,7 +0,0 @@ -// +build js - -package sync - -// Referenced by tests, need to have no-op implementations. -var Runtime_procPin = func() int { return 0 } -var Runtime_procUnpin = func() {} diff --git a/compiler/natives/src/sync/map_test.go b/compiler/natives/src/sync/map_test.go new file mode 100644 index 000000000..432096071 --- /dev/null +++ b/compiler/natives/src/sync/map_test.go @@ -0,0 +1,10 @@ +//go:build js +// +build js + +package sync_test + +import "testing" + +func TestIssue40999(t *testing.T) { + t.Skip("test relies on runtime.SetFinalizer, which GopherJS does not implement") +} diff --git a/compiler/natives/src/sync/pool.go b/compiler/natives/src/sync/pool.go index 629010d9e..9d3825e14 100644 --- a/compiler/natives/src/sync/pool.go +++ b/compiler/natives/src/sync/pool.go @@ -1,13 +1,27 @@ +//go:build js // +build js package sync -import "unsafe" - +// A Pool is a set of temporary objects that may be individually saved and +// retrieved. +// +// GopherJS provides a simpler, naive implementation with no synchronization at +// all. This is still correct for the GopherJS runtime because: +// +// 1. JavaScript is single-threaded, so it is impossible for two threads to be +// accessing the pool at the same moment in time. +// 2. GopherJS goroutine implementation uses cooperative multi-tasking model, +// which only allows passing control to other goroutines when the function +// might block. +// +// TODO(nevkontakte): Consider adding a mutex just to be safe if it doesn't +// create a large performance hit. +// +// Note: there is a special handling in the gopherjs/build package that filters +// out all original Pool implementation in order to avoid awkward unused fields +// referenced by dead code. type Pool struct { - local unsafe.Pointer - localSize uintptr - store []interface{} New func() interface{} } @@ -31,5 +45,6 @@ func (p *Pool) Put(x interface{}) { p.store = append(p.store, x) } -func runtime_registerPoolCleanup(cleanup func()) { -} +// These are referenced by tests, but are no-ops in GopherJS runtime. +func runtime_procPin() int { return 0 } +func runtime_procUnpin() {} diff --git a/compiler/natives/src/sync/pool_test.go b/compiler/natives/src/sync/pool_test.go new file mode 100644 index 000000000..ea35fd136 --- /dev/null +++ b/compiler/natives/src/sync/pool_test.go @@ -0,0 +1,43 @@ +//go:build js +// +build js + +package sync_test + +import ( + . "sync" + "testing" +) + +func TestPool(t *testing.T) { + var p Pool + if p.Get() != nil { + t.Fatal("expected empty") + } + + p.Put("a") + p.Put("b") + + want := []interface{}{"b", "a", nil} + for i := range want { + got := p.Get() + if got != want[i] { + t.Fatalf("Got: p.Get() returned: %s. Want: %s.", got, want) + } + } +} + +func TestPoolGC(t *testing.T) { + t.Skip("This test uses runtime.GC(), which GopherJS doesn't support.") +} + +func TestPoolRelease(t *testing.T) { + t.Skip("This test uses runtime.GC(), which GopherJS doesn't support.") +} + +func TestPoolDequeue(t *testing.T) { + t.Skip("This test targets upstream pool implementation, which is not used by GopherJS.") +} + +func TestPoolChain(t *testing.T) { + t.Skip("This test targets upstream pool implementation, which is not used by GopherJS.") +} diff --git a/compiler/natives/src/sync/sync.go b/compiler/natives/src/sync/sync.go index 2ae46e0a6..294b0b109 100644 --- a/compiler/natives/src/sync/sync.go +++ b/compiler/natives/src/sync/sync.go @@ -1,8 +1,13 @@ +//go:build js // +build js package sync -import "github.com/gopherjs/gopherjs/js" +import ( + _ "unsafe" // For go:linkname + + "github.com/gopherjs/gopherjs/js" +) var semWaiters = make(map[*uint32][]chan bool) @@ -18,13 +23,13 @@ var semWaiters = make(map[*uint32][]chan bool) var semAwoken = make(map[*uint32]uint32) func runtime_Semacquire(s *uint32) { - runtime_SemacquireMutex(s, false) + runtime_SemacquireMutex(s, false, 1) } // SemacquireMutex is like Semacquire, but for profiling contended Mutexes. // Mutex profiling is not supported, so just use the same implementation as runtime_Semacquire. // TODO: Investigate this. If it's possible to implement, consider doing so, otherwise remove this comment. -func runtime_SemacquireMutex(s *uint32, lifo bool) { +func runtime_SemacquireMutex(s *uint32, lifo bool, skipframes int) { if (*s - semAwoken[s]) == 0 { ch := make(chan bool) if lifo { @@ -41,7 +46,7 @@ func runtime_SemacquireMutex(s *uint32, lifo bool) { *s-- } -func runtime_Semrelease(s *uint32, handoff bool) { +func runtime_Semrelease(s *uint32, handoff bool, skipframes int) { // TODO: Use handoff if needed/possible. *s++ @@ -68,11 +73,8 @@ func runtime_canSpin(i int) bool { return false } -// Copy of time.runtimeNano. -func runtime_nanotime() int64 { - const millisecond = 1000000 - return js.Global.Get("Date").New().Call("getTime").Int64() * millisecond -} +//go:linkname runtime_nanotime runtime.nanotime +func runtime_nanotime() int64 // Implemented in runtime. func throw(s string) { diff --git a/compiler/natives/src/sync/sync_test.go b/compiler/natives/src/sync/sync_test.go deleted file mode 100644 index a61bcf3e1..000000000 --- a/compiler/natives/src/sync/sync_test.go +++ /dev/null @@ -1,23 +0,0 @@ -// +build js - -package sync_test - -import ( - "testing" -) - -func TestPool(t *testing.T) { - t.Skip() -} - -func TestPoolGC(t *testing.T) { - t.Skip() -} - -func TestPoolRelease(t *testing.T) { - t.Skip() -} - -func TestCondCopy(t *testing.T) { - t.Skip() -} diff --git a/compiler/natives/src/sync/waitgroup.go b/compiler/natives/src/sync/waitgroup.go index 0d4873d67..e1f20eeb6 100644 --- a/compiler/natives/src/sync/waitgroup.go +++ b/compiler/natives/src/sync/waitgroup.go @@ -1,3 +1,4 @@ +//go:build js // +build js package sync @@ -6,7 +7,8 @@ type WaitGroup struct { counter int ch chan struct{} - state1 [3]uint32 + state1 uint64 + state2 uint32 } func (wg *WaitGroup) Add(delta int) { diff --git a/compiler/natives/src/syscall/fs_js.go b/compiler/natives/src/syscall/fs_js.go new file mode 100644 index 000000000..5a0a5a64d --- /dev/null +++ b/compiler/natives/src/syscall/fs_js.go @@ -0,0 +1,49 @@ +//go:build js + +package syscall + +import ( + "syscall/js" +) + +// fsCall emulates a file system-related syscall via a corresponding NodeJS fs +// API. +// +// This version is similar to the upstream, but it gracefully handles missing fs +// methods (allowing for smaller prelude) and removes a workaround for an +// obsolete NodeJS version. +func fsCall(name string, args ...interface{}) (js.Value, error) { + type callResult struct { + val js.Value + err error + } + + c := make(chan callResult, 1) + f := js.FuncOf(func(this js.Value, args []js.Value) interface{} { + var res callResult + + // Check that args has at least one element, then check both IsUndefined() and IsNull() on + // that element. In some situations, BrowserFS calls the callback without arguments or with + // an undefined argument: https://github.com/gopherjs/gopherjs/pull/1118 + if len(args) >= 1 { + if jsErr := args[0]; !jsErr.IsUndefined() && !jsErr.IsNull() { + res.err = mapJSError(jsErr) + } + } + + res.val = js.Undefined() + if len(args) >= 2 { + res.val = args[1] + } + + c <- res + return nil + }) + defer f.Release() + if jsFS.Get(name).IsUndefined() { + return js.Undefined(), ENOSYS + } + jsFS.Call(name, append(args, f)...) + res := <-c + return res.val, res.err +} diff --git a/compiler/natives/src/syscall/js/export_test.go b/compiler/natives/src/syscall/js/export_test.go new file mode 100644 index 000000000..8f030c4d7 --- /dev/null +++ b/compiler/natives/src/syscall/js/export_test.go @@ -0,0 +1,8 @@ +//go:build js +// +build js + +package js + +// Defined to avoid a compile error in the original TestGarbageCollection() +// body. +var JSGo Value diff --git a/compiler/natives/src/syscall/js/js.go b/compiler/natives/src/syscall/js/js.go index 81af995b7..c0c18a614 100644 --- a/compiler/natives/src/syscall/js/js.go +++ b/compiler/natives/src/syscall/js/js.go @@ -1,9 +1,9 @@ +//go:build js // +build js package js import ( - "reflect" "unsafe" "github.com/gopherjs/gopherjs/js" @@ -22,27 +22,27 @@ const ( TypeFunction ) +// Same order as Type constants +var typeNames = []string{ + "undefined", + "null", + "boolean", + "number", + "string", + "symbol", + "object", + "function", +} + func (t Type) String() string { - switch t { - case TypeUndefined: - return "undefined" - case TypeNull: - return "null" - case TypeBoolean: - return "boolean" - case TypeNumber: - return "number" - case TypeString: - return "string" - case TypeSymbol: - return "symbol" - case TypeObject: - return "object" - case TypeFunction: - return "function" - default: + if int(t) < 0 || len(typeNames) <= int(t) { panic("bad type") } + return typeNames[t] +} + +func (t Type) isObject() bool { + return t == TypeObject || t == TypeFunction } func Global() Value { @@ -62,10 +62,14 @@ type Func struct { } func (f Func) Release() { + js.Global.Set("$exportedFunctions", js.Global.Get("$exportedFunctions").Int()-1) f.Value = Null() } func FuncOf(fn func(this Value, args []Value) interface{}) Func { + // Existence of a wrapped function means that an external event may awaken the + // program and we need to suppress deadlock detection. + js.Global.Set("$exportedFunctions", js.Global.Get("$exportedFunctions").Int()+1) return Func{ Value: objectToValue(js.MakeFunc(func(this *js.Object, args []*js.Object) interface{} { vargs := make([]Value, len(args)) @@ -90,50 +94,42 @@ type Value struct { // inited represents whether Value is non-zero value. true represents the value is not 'undefined'. inited bool + + _ [0]func() // uncomparable; to make == not compile } func objectToValue(obj *js.Object) Value { if obj == js.Undefined { return Value{} } - return Value{obj, true} + return Value{v: obj, inited: true} } var ( - id *js.Object - instanceOf *js.Object - getValueType *js.Object + id *js.Object + instanceOf *js.Object + typeOf *js.Object ) func init() { if js.Global != nil { - id = js.Global.Call("eval", "(function(x) { return x; })") - instanceOf = js.Global.Call("eval", "(function(x, y) { return x instanceof y; })") - getValueType = js.Global.Call("eval", `(function(x) { - if (typeof(x) === "undefined") { - return 0; // TypeUndefined - } - if (x === null) { - return 1; // TypeNull - } - if (typeof(x) === "boolean") { - return 2; // TypeBoolean - } - if (typeof(x) === "number") { - return 3; // TypeNumber - } - if (typeof(x) === "string") { - return 4; // TypeString - } - if (typeof(x) === "symbol") { - return 5; // TypeSymbol - } - if (typeof(x) === "function") { - return 7; // TypeFunction - } - return 6; // TypeObject -})`) + id = js.Global.Get("$id") + instanceOf = js.Global.Get("$instanceOf") + typeOf = js.Global.Get("$typeOf") + } +} + +func getValueType(obj *js.Object) Type { + if obj == nil { + return TypeNull + } + name := typeOf.Invoke(obj).String() + for type2, name2 := range typeNames { + if name == name2 { + return Type(type2) + } } + return TypeObject } func ValueOf(x interface{}) Value { @@ -142,14 +138,12 @@ func ValueOf(x interface{}) Value { return x case Func: return x.Value - case TypedArray: - return x.Value case nil: return Null() case bool, int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, float32, float64, unsafe.Pointer, string, map[string]interface{}, []interface{}: return objectToValue(id.Invoke(x)) default: - panic(`invalid arg: ` + reflect.TypeOf(x).String()) + panic("ValueOf: invalid value") } } @@ -177,6 +171,22 @@ func convertArgs(args ...interface{}) []interface{} { return newArgs } +func convertJSError() { + err := recover() + if err == nil { + return + } + if jsErr, ok := err.(*js.Error); ok { + // We expect that all panics caught by Value.Call() are in fact JavaScript + // exceptions intercepted by GopherJS runtime, which we convert to + // syscall/js.Error, which the callers would expect. + panic(Error{Value: objectToValue(jsErr.Object)}) + } + // Panics of other types are unexpected and should never happen. But if it + // does, we will just re-raise it as-is. + panic(err) +} + func (v Value) Call(m string, args ...interface{}) Value { if vType := v.Type(); vType != TypeObject && vType != TypeFunction { panic(&ValueError{"Value.Call", vType}) @@ -184,6 +194,7 @@ func (v Value) Call(m string, args ...interface{}) Value { if propType := v.Get(m).Type(); propType != TypeFunction { panic("js: Value.Call: property " + m + " is not a function, got " + propType.String()) } + defer convertJSError() return objectToValue(v.internal().Call(m, convertArgs(args...)...)) } @@ -195,10 +206,16 @@ func (v Value) Float() float64 { } func (v Value) Get(p string) Value { + if vType := v.Type(); !vType.isObject() { + panic(&ValueError{"Value.Get", vType}) + } return objectToValue(v.internal().Get(p)) } func (v Value) Index(i int) Value { + if vType := v.Type(); !vType.isObject() { + panic(&ValueError{"Value.Index", vType}) + } return objectToValue(v.internal().Index(i)) } @@ -229,19 +246,61 @@ func (v Value) Length() int { } func (v Value) New(args ...interface{}) Value { + defer func() { + err := recover() + if err == nil { + return + } + if vType := v.Type(); vType != TypeFunction { // check here to avoid overhead in success case + panic(&ValueError{"Value.New", vType}) + } + if jsErr, ok := err.(*js.Error); ok { + panic(Error{objectToValue(jsErr.Object)}) + } + panic(err) + }() return objectToValue(v.internal().New(convertArgs(args...)...)) } func (v Value) Set(p string, x interface{}) { + if vType := v.Type(); !vType.isObject() { + panic(&ValueError{"Value.Set", vType}) + } v.internal().Set(p, convertArgs(x)[0]) } func (v Value) SetIndex(i int, x interface{}) { + if vType := v.Type(); !vType.isObject() { + panic(&ValueError{"Value.SetIndex", vType}) + } v.internal().SetIndex(i, convertArgs(x)[0]) } +// String returns the value v as a string. +// String is a special case because of Go's String method convention. Unlike the other getters, +// it does not panic if v's Type is not TypeString. Instead, it returns a string of the form "" +// or "" where T is v's type and V is a string representation of v's value. func (v Value) String() string { - return v.internal().String() + switch v.Type() { + case TypeString: + return v.internal().String() + case TypeUndefined: + return "" + case TypeNull: + return "" + case TypeBoolean: + return "" + case TypeNumber: + return "" + case TypeSymbol: + return "" + case TypeObject: + return "" + case TypeFunction: + return "" + default: + panic("bad type") + } } func (v Value) Truthy() bool { @@ -249,24 +308,32 @@ func (v Value) Truthy() bool { } func (v Value) Type() Type { - return Type(getValueType.Invoke(v.internal()).Int()) + return Type(getValueType(v.internal())) } -type TypedArray struct { - Value +func (v Value) IsNull() bool { + return v.Type() == TypeNull } -func TypedArrayOf(slice interface{}) TypedArray { - switch slice := slice.(type) { - case []int8, []int16, []int32, []uint8, []uint16, []uint32, []float32, []float64: - return TypedArray{objectToValue(id.Invoke(slice))} - default: - panic("TypedArrayOf: not a supported slice") +func (v Value) IsUndefined() bool { + return !v.inited +} + +func (v Value) IsNaN() bool { + return js.Global.Call("isNaN", v.internal()).Bool() +} + +// Delete deletes the JavaScript property p of value v. +// It panics if v is not a JavaScript object. +func (v Value) Delete(p string) { + if vType := v.Type(); !vType.isObject() { + panic(&ValueError{"Value.Delete", vType}) } + v.internal().Delete(p) } -func (t *TypedArray) Release() { - t.Value = Value{} +func (v Value) Equal(w Value) bool { + return v.internal() == w.internal() } type ValueError struct { @@ -278,6 +345,25 @@ func (e *ValueError) Error() string { return "syscall/js: call of " + e.Method + " on " + e.Type.String() } -type Wrapper interface { - JSValue() Value +// CopyBytesToGo copies bytes from the Uint8Array src to dst. +// It returns the number of bytes copied, which will be the minimum of the lengths of src and dst. +// CopyBytesToGo panics if src is not an Uint8Array. +func CopyBytesToGo(dst []byte, src Value) int { + vlen := src.v.Length() + if dlen := len(dst); dlen < vlen { + vlen = dlen + } + copy(dst, src.v.Interface().([]byte)) + return vlen +} + +// CopyBytesToJS copies bytes from src to the Uint8Array dst. +// It returns the number of bytes copied, which will be the minimum of the lengths of src and dst. +// CopyBytesToJS panics if dst is not an Uint8Array. +func CopyBytesToJS(dst Value, src []byte) int { + dt, ok := dst.v.Interface().([]byte) + if !ok { + panic("syscall/js: CopyBytesToJS: expected dst to be an Uint8Array") + } + return copy(dt, src) } diff --git a/compiler/natives/src/syscall/js/js_test.go b/compiler/natives/src/syscall/js/js_test.go new file mode 100644 index 000000000..999266da2 --- /dev/null +++ b/compiler/natives/src/syscall/js/js_test.go @@ -0,0 +1,19 @@ +//go:build js +// +build js + +package js_test + +import "testing" + +func TestIntConversion(t *testing.T) { + // Same as upstream, but only test cases appropriate for a 32-bit environment. + testIntConversion(t, 0) + testIntConversion(t, 1) + testIntConversion(t, -1) + testIntConversion(t, 1<<20) + testIntConversion(t, -1<<20) +} + +func TestGarbageCollection(t *testing.T) { + t.Skip("GC is not supported by GopherJS") +} diff --git a/compiler/natives/src/syscall/syscall_unix.go b/compiler/natives/src/syscall/legacy.go similarity index 53% rename from compiler/natives/src/syscall/syscall_unix.go rename to compiler/natives/src/syscall/legacy.go index 528d342a9..beb99eb78 100644 --- a/compiler/natives/src/syscall/syscall_unix.go +++ b/compiler/natives/src/syscall/legacy.go @@ -1,54 +1,29 @@ -// +build js,!windows +//go:build legacy_syscall package syscall import ( - "runtime" - "unsafe" - "github.com/gopherjs/gopherjs/js" ) -func runtime_envs() []string { - process := js.Global.Get("process") - if process == js.Undefined { - return nil - } - jsEnv := process.Get("env") - envkeys := js.Global.Get("Object").Call("keys", jsEnv) - envs := make([]string, envkeys.Length()) - for i := 0; i < envkeys.Length(); i++ { - key := envkeys.Index(i).String() - envs[i] = key + "=" + jsEnv.Get(key).String() - } - return envs -} +var ( + syscallModule *js.Object + alreadyTriedToLoad = false + minusOne = -1 +) -func setenv_c(k, v string) { - process := js.Global.Get("process") - if process == js.Undefined { - return - } - process.Get("env").Set(k, v) -} +var warningPrinted = false -func unsetenv_c(k string) { - process := js.Global.Get("process") - if process == js.Undefined { - return +func printWarning() { + if !warningPrinted { + js.Global.Get("console").Call("error", "warning: system calls not available, see https://github.com/gopherjs/gopherjs/blob/master/doc/syscalls.md") } - process.Get("env").Delete(k) + warningPrinted = true } -var syscallModule *js.Object -var alreadyTriedToLoad = false -var minusOne = -1 - func syscallByName(name string) *js.Object { - defer func() { - recover() - // return nil if recovered - }() + defer recover() // return nil if recovered + if syscallModule == nil { if alreadyTriedToLoad { return nil @@ -68,18 +43,8 @@ func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) { r := f.Invoke(trap, a1, a2, a3) return uintptr(r.Index(0).Int()), uintptr(r.Index(1).Int()), Errno(r.Index(2).Int()) } - if trap == SYS_WRITE && (a1 == 1 || a1 == 2) { - array := js.InternalObject(a2) - slice := make([]byte, array.Length()) - js.InternalObject(slice).Set("$array", array) - printToConsole(slice) - return uintptr(array.Length()), 0, 0 - } - if trap == exitTrap { - runtime.Goexit() - } printWarning() - return uintptr(minusOne), 0, EACCES + return uintptr(minusOne), 0, ENOSYS } func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) { @@ -90,7 +55,7 @@ func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) if trap != 202 { // kern.osrelease on OS X, happens in init of "os" package printWarning() } - return uintptr(minusOne), 0, EACCES + return uintptr(minusOne), 0, ENOSYS } func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) { @@ -99,7 +64,7 @@ func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) { return uintptr(r.Index(0).Int()), uintptr(r.Index(1).Int()), Errno(r.Index(2).Int()) } printWarning() - return uintptr(minusOne), 0, EACCES + return uintptr(minusOne), 0, ENOSYS } func rawSyscallNoError(trap, a1, a2, a3 uintptr) (r1, r2 uintptr) { @@ -117,17 +82,5 @@ func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errn return uintptr(r.Index(0).Int()), uintptr(r.Index(1).Int()), Errno(r.Index(2).Int()) } printWarning() - return uintptr(minusOne), 0, EACCES -} - -func BytePtrFromString(s string) (*byte, error) { - array := js.Global.Get("Uint8Array").New(len(s) + 1) - for i, b := range []byte(s) { - if b == 0 { - return nil, EINVAL - } - array.SetIndex(i, b) - } - array.SetIndex(len(s), 0) - return (*byte)(unsafe.Pointer(array.Unsafe())), nil + return uintptr(minusOne), 0, ENOSYS } diff --git a/compiler/natives/src/syscall/syscall.go b/compiler/natives/src/syscall/syscall.go deleted file mode 100644 index 44c67ec9b..000000000 --- a/compiler/natives/src/syscall/syscall.go +++ /dev/null @@ -1,64 +0,0 @@ -// +build js - -package syscall - -import ( - "unsafe" - - "github.com/gopherjs/gopherjs/js" -) - -var warningPrinted = false -var lineBuffer []byte - -func init() { - js.Global.Set("$flushConsole", js.InternalObject(func() { - if len(lineBuffer) != 0 { - js.Global.Get("console").Call("log", string(lineBuffer)) - lineBuffer = nil - } - })) -} - -func printWarning() { - if !warningPrinted { - js.Global.Get("console").Call("error", "warning: system calls not available, see https://github.com/gopherjs/gopherjs/blob/master/doc/syscalls.md") - } - warningPrinted = true -} - -func printToConsole(b []byte) { - goPrintToConsole := js.Global.Get("goPrintToConsole") - if goPrintToConsole != js.Undefined { - goPrintToConsole.Invoke(js.InternalObject(b)) - return - } - - lineBuffer = append(lineBuffer, b...) - for { - i := indexByte(lineBuffer, '\n') - if i == -1 { - break - } - js.Global.Get("console").Call("log", string(lineBuffer[:i])) // don't use println, since it does not externalize multibyte characters - lineBuffer = lineBuffer[i+1:] - } -} - -func use(p unsafe.Pointer) { - // no-op -} - -func Exit(code int) { - Syscall(exitTrap, uintptr(code), 0, 0) -} - -// indexByte is copied from bytes package to avoid importing it (since the real syscall package doesn't). -func indexByte(s []byte, c byte) int { - for i, b := range s { - if b == c { - return i - } - } - return -1 -} diff --git a/compiler/natives/src/syscall/syscall_darwin.go b/compiler/natives/src/syscall/syscall_darwin.go deleted file mode 100644 index 632fa93d5..000000000 --- a/compiler/natives/src/syscall/syscall_darwin.go +++ /dev/null @@ -1,83 +0,0 @@ -// +build js - -package syscall - -import "github.com/gopherjs/gopherjs/js" - -func funcPC(f func()) uintptr { - switch js.InternalObject(f) { - case js.InternalObject(libc_open_trampoline): - return SYS_OPEN - case js.InternalObject(libc_stat64_trampoline): - return SYS_STAT64 - case js.InternalObject(libc_fstat64_trampoline): - return SYS_FSTAT64 - case js.InternalObject(libc_lstat64_trampoline): - return SYS_LSTAT64 - case js.InternalObject(libc_mkdir_trampoline): - return SYS_MKDIR - case js.InternalObject(libc_chdir_trampoline): - return SYS_CHDIR - case js.InternalObject(libc_rmdir_trampoline): - return SYS_RMDIR - case js.InternalObject(libc___getdirentries64_trampoline): - return SYS_GETDIRENTRIES64 - case js.InternalObject(libc_getattrlist_trampoline): - return SYS_GETATTRLIST - case js.InternalObject(libc_symlink_trampoline): - return SYS_SYMLINK - case js.InternalObject(libc_readlink_trampoline): - return SYS_READLINK - case js.InternalObject(libc_fcntl_trampoline): - return SYS_FCNTL - case js.InternalObject(libc_read_trampoline): - return SYS_READ - case js.InternalObject(libc_pread_trampoline): - return SYS_PREAD - case js.InternalObject(libc_write_trampoline): - return SYS_WRITE - case js.InternalObject(libc_lseek_trampoline): - return SYS_LSEEK - case js.InternalObject(libc_close_trampoline): - return SYS_CLOSE - case js.InternalObject(libc_unlink_trampoline): - return SYS_UNLINK - case js.InternalObject(libc_getpid_trampoline): - return SYS_GETPID - case js.InternalObject(libc_getuid_trampoline): - return SYS_GETUID - case js.InternalObject(libc_getgid_trampoline): - return SYS_GETGID - default: - // If we just return -1, the caller can only print an unhelpful generic error message, like - // "signal: bad system call". - // So, execute f() to get a more helpful error message that includes the syscall name, like - // "runtime error: native function not implemented: syscall.libc_getpid_trampoline". - f() - return uintptr(minusOne) - } -} - -func syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) { - return Syscall(trap, a1, a2, a3) -} - -func syscallX(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) { - return Syscall(trap, a1, a2, a3) -} - -func syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) { - return Syscall6(trap, a1, a2, a3, a4, a5, a6) -} - -func syscall6X(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) { - panic("syscall6X is not implemented") -} - -func rawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) { - return RawSyscall(trap, a1, a2, a3) -} - -func rawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) { - return RawSyscall6(trap, a1, a2, a3, a4, a5, a6) -} diff --git a/compiler/natives/src/syscall/syscall_js_wasm.go b/compiler/natives/src/syscall/syscall_js_wasm.go new file mode 100644 index 000000000..5bcbdeed4 --- /dev/null +++ b/compiler/natives/src/syscall/syscall_js_wasm.go @@ -0,0 +1,78 @@ +package syscall + +import ( + "syscall/js" +) + +func runtime_envs() []string { + process := js.Global().Get("process") + if process.IsUndefined() { + return nil + } + jsEnv := process.Get("env") + if jsEnv.IsUndefined() { + return nil + } + envkeys := js.Global().Get("Object").Call("keys", jsEnv) + envs := make([]string, envkeys.Length()) + for i := 0; i < envkeys.Length(); i++ { + key := envkeys.Index(i).String() + envs[i] = key + "=" + jsEnv.Get(key).String() + } + return envs +} + +func setenv_c(k, v string) { + process := js.Global().Get("process") + if process.IsUndefined() { + return + } + process.Get("env").Set(k, v) +} + +func unsetenv_c(k string) { + process := js.Global().Get("process") + if process.IsUndefined() { + return + } + process.Get("env").Delete(k) +} + +func setStat(st *Stat_t, jsSt js.Value) { + // This method is an almost-exact copy of upstream, except for 4 places where + // time stamps are obtained as floats in lieu of int64. Upstream wasm emulates + // a 64-bit architecture and millisecond-based timestamps fit within an int + // type. GopherJS is 32-bit and use of 32-bit ints causes timestamp truncation. + // We get timestamps as float64 (which matches JS-native representation) and + // convert then to int64 manually, since syscall/js.Value doesn't have an + // Int64 method. + st.Dev = int64(jsSt.Get("dev").Int()) + st.Ino = uint64(jsSt.Get("ino").Int()) + st.Mode = uint32(jsSt.Get("mode").Int()) + st.Nlink = uint32(jsSt.Get("nlink").Int()) + st.Uid = uint32(jsSt.Get("uid").Int()) + st.Gid = uint32(jsSt.Get("gid").Int()) + st.Rdev = int64(jsSt.Get("rdev").Int()) + st.Size = int64(jsSt.Get("size").Int()) + st.Blksize = int32(jsSt.Get("blksize").Int()) + st.Blocks = int32(jsSt.Get("blocks").Int()) + atime := int64(jsSt.Get("atimeMs").Float()) // Int64 + st.Atime = atime / 1000 + st.AtimeNsec = (atime % 1000) * 1000000 + mtime := int64(jsSt.Get("mtimeMs").Float()) // Int64 + st.Mtime = mtime / 1000 + st.MtimeNsec = (mtime % 1000) * 1000000 + ctime := int64(jsSt.Get("ctimeMs").Float()) // Int64 + st.Ctime = ctime / 1000 + st.CtimeNsec = (ctime % 1000) * 1000000 +} + +func Exit(code int) { + if process := js.Global().Get("process"); !process.IsUndefined() { + process.Call("exit", code) + return + } + if code != 0 { + js.Global().Get("console").Call("warn", "Go program exited with non-zero code:", code) + } +} diff --git a/compiler/natives/src/syscall/syscall_linux.go b/compiler/natives/src/syscall/syscall_linux.go deleted file mode 100644 index 41024b62c..000000000 --- a/compiler/natives/src/syscall/syscall_linux.go +++ /dev/null @@ -1,5 +0,0 @@ -// +build js - -package syscall - -const exitTrap = SYS_EXIT_GROUP diff --git a/compiler/natives/src/syscall/syscall_nonlinux.go b/compiler/natives/src/syscall/syscall_nonlinux.go deleted file mode 100644 index 5b79fcfd0..000000000 --- a/compiler/natives/src/syscall/syscall_nonlinux.go +++ /dev/null @@ -1,5 +0,0 @@ -// +build js,!linux - -package syscall - -const exitTrap = SYS_EXIT diff --git a/compiler/natives/src/syscall/syscall_windows.go b/compiler/natives/src/syscall/syscall_windows.go deleted file mode 100644 index e0a5a522a..000000000 --- a/compiler/natives/src/syscall/syscall_windows.go +++ /dev/null @@ -1,105 +0,0 @@ -// +build js - -package syscall - -import "runtime" - -var minusOne = -1 - -func Syscall(trap, nargs, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) { - printWarning() - return uintptr(minusOne), 0, EACCES -} - -func Syscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) { - printWarning() - return uintptr(minusOne), 0, EACCES -} - -func Syscall9(trap, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno) { - printWarning() - return uintptr(minusOne), 0, EACCES -} - -func Syscall12(trap, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12 uintptr) (r1, r2 uintptr, err Errno) { - printWarning() - return uintptr(minusOne), 0, EACCES -} - -func Syscall15(trap, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15 uintptr) (r1, r2 uintptr, err Errno) { - printWarning() - return uintptr(minusOne), 0, EACCES -} - -func Syscall18(trap, nargs, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18 uintptr) (r1, r2 uintptr, err Errno) { - printWarning() - return uintptr(minusOne), 0, EACCES -} - -func loadlibrary(filename *uint16) (handle uintptr, err Errno) { - printWarning() - return uintptr(minusOne), EACCES -} - -func getprocaddress(handle uintptr, procname *uint8) (proc uintptr, err Errno) { - printWarning() - return uintptr(minusOne), EACCES -} - -func (d *LazyDLL) Load() error { - return &DLLError{Msg: "system calls not available, see https://github.com/gopherjs/gopherjs/blob/master/doc/syscalls.md"} -} - -func (p *LazyProc) Find() error { - return &DLLError{Msg: "system calls not available, see https://github.com/gopherjs/gopherjs/blob/master/doc/syscalls.md"} -} - -func getStdHandle(h int) (fd Handle) { - if h == STD_OUTPUT_HANDLE { - return 1 - } - if h == STD_ERROR_HANDLE { - return 2 - } - return 0 -} - -func GetConsoleMode(console Handle, mode *uint32) (err error) { - return DummyError{} -} - -func WriteFile(handle Handle, buf []byte, done *uint32, overlapped *Overlapped) (err error) { - if handle == 1 || handle == 2 { - printToConsole(buf) - *done = uint32(len(buf)) - return nil - } - printWarning() - return nil -} - -func ExitProcess(exitcode uint32) { - runtime.Goexit() -} - -func GetCommandLine() (cmd *uint16) { - return -} - -func CommandLineToArgv(cmd *uint16, argc *int32) (argv *[8192]*[8192]uint16, err error) { - return nil, DummyError{} -} - -func Getenv(key string) (value string, found bool) { - return "", false -} - -func GetTimeZoneInformation(tzi *Timezoneinformation) (rc uint32, err error) { - return 0, DummyError{} -} - -type DummyError struct{} - -func (e DummyError) Error() string { - return "" -} diff --git a/compiler/natives/src/testing/allocs_test.go b/compiler/natives/src/testing/allocs_test.go new file mode 100644 index 000000000..54c2f545b --- /dev/null +++ b/compiler/natives/src/testing/allocs_test.go @@ -0,0 +1,10 @@ +//go:build js +// +build js + +package testing_test + +import "testing" + +func TestAllocsPerRun(t *testing.T) { + t.Skip("runtime.ReadMemStats() is not supported by GopherJS.") +} diff --git a/compiler/natives/src/testing/example.go b/compiler/natives/src/testing/example.go index b44af1328..bf8d06482 100644 --- a/compiler/natives/src/testing/example.go +++ b/compiler/natives/src/testing/example.go @@ -1,3 +1,4 @@ +//go:build js // +build js package testing @@ -16,7 +17,7 @@ func runExample(eg InternalExample) (ok bool) { // Capture stdout. stdout := os.Stdout - w, err := tempFile("." + eg.Name + ".stdout.") + w, err := os.CreateTemp("", "."+eg.Name+".stdout.") if err != nil { fmt.Fprintln(os.Stderr, err) os.Exit(1) @@ -33,7 +34,7 @@ func runExample(eg InternalExample) (ok bool) { // Close file, restore stdout, get output. w.Close() os.Stdout = stdout - out, readFileErr := readFile(w.Name()) + out, readFileErr := os.ReadFile(w.Name()) _ = os.Remove(w.Name()) if readFileErr != nil { fmt.Fprintf(os.Stderr, "testing: reading stdout file: %v\n", readFileErr) @@ -42,11 +43,11 @@ func runExample(eg InternalExample) (ok bool) { var fail string err := recover() - got := strings.TrimSpace(out) + got := strings.TrimSpace(string(out)) want := strings.TrimSpace(eg.Output) if eg.Unordered { if sortLines(got) != sortLines(want) && err == nil { - fail = fmt.Sprintf("got:\n%s\nwant (unordered):\n%s\n", out, eg.Output) + fail = fmt.Sprintf("got:\n%s\nwant (unordered):\n%s\n", string(out), eg.Output) } } else { if got != want && err == nil { diff --git a/compiler/natives/src/testing/helper_test.go b/compiler/natives/src/testing/helper_test.go new file mode 100644 index 000000000..6815fd651 --- /dev/null +++ b/compiler/natives/src/testing/helper_test.go @@ -0,0 +1,8 @@ +//go:build js +// +build js + +package testing + +func TestTBHelper(t *T) { + t.Skip("GopherJS does not support generics yet.") +} diff --git a/compiler/natives/src/testing/helperfuncs_test.go b/compiler/natives/src/testing/helperfuncs_test.go new file mode 100644 index 000000000..54a1ee737 --- /dev/null +++ b/compiler/natives/src/testing/helperfuncs_test.go @@ -0,0 +1,13 @@ +//go:build js +// +build js + +package testing + +//gopherjs:purge for go1.19 without generics +func genericHelper[G any](t *T, msg string) + +//gopherjs:purge for go1.19 without generics +var genericIntHelper = genericHelper[int] + +//gopherjs:purge for go1.19 without generics (uses genericHelper) +func testHelper(t *T) diff --git a/compiler/natives/src/testing/ioutil.go b/compiler/natives/src/testing/ioutil.go deleted file mode 100644 index a1527f9cc..000000000 --- a/compiler/natives/src/testing/ioutil.go +++ /dev/null @@ -1,66 +0,0 @@ -// +build js - -package testing - -import ( - "bytes" - "io" - "os" - "strconv" - "sync" - "time" -) - -var rand uint32 -var randmu sync.Mutex - -func reseed() uint32 { - return uint32(time.Now().UnixNano() + int64(os.Getpid())) -} - -func nextSuffix() string { - randmu.Lock() - r := rand - if r == 0 { - r = reseed() - } - r = r*1664525 + 1013904223 // constants from Numerical Recipes - rand = r - randmu.Unlock() - return strconv.Itoa(int(1e9 + r%1e9))[1:] -} - -// A functional copy of ioutil.TempFile, to avoid extra imports. -func tempFile(prefix string) (f *os.File, err error) { - dir := os.TempDir() - - nconflict := 0 - for i := 0; i < 10000; i++ { - name := dir + string(os.PathSeparator) + prefix + nextSuffix() - f, err = os.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600) - if os.IsExist(err) { - if nconflict++; nconflict > 10 { - randmu.Lock() - rand = reseed() - randmu.Unlock() - } - continue - } - break - } - return -} - -func readFile(filename string) (string, error) { - f, err := os.Open(filename) - if err != nil { - return "", err - } - defer f.Close() - var buf bytes.Buffer - _, err = io.Copy(&buf, f) - if err != nil { - return "", err - } - return buf.String(), nil -} diff --git a/compiler/natives/src/testing/quick/quick.go b/compiler/natives/src/testing/quick/quick.go new file mode 100644 index 000000000..51fa843aa --- /dev/null +++ b/compiler/natives/src/testing/quick/quick.go @@ -0,0 +1,37 @@ +//go:build js + +package quick + +var maxCountCap int = 0 + +// GopherJSInternalMaxCountCap sets an upper bound of iterations quick test may +// perform. THIS IS GOPHERJS-INTERNAL API, DO NOT USE IT OUTSIDE OF THE GOPHERJS +// CODEBASE, IT MAY CHANGE OR DISAPPEAR WITHOUT NOTICE. +// +// This function can be used to limit run time of standard library tests which +// use testing/quick with too many iterations for GopherJS to complete in a +// reasonable amount of time. This is a better compromise than disabling a slow +// test entirely. +// +// //gopherjs:keep-original +// func TestFoo(t *testing.T) { +// t.Cleanup(quick.GopherJSInternalMaxCountCap(100)) +// _gopherjs_original_TestFoo(t) +// } + +func GopherJSInternalMaxCountCap(newCap int) (restore func()) { + previousCap := maxCountCap + maxCountCap = newCap + return func() { + maxCountCap = previousCap + } +} + +//gopherjs:keep-original +func (c *Config) getMaxCount() (maxCount int) { + maxCount = c._gopherjs_original_getMaxCount() + if maxCountCap > 0 && maxCount > maxCountCap { + maxCount = maxCountCap + } + return maxCount +} diff --git a/compiler/natives/src/testing/sub_test.go b/compiler/natives/src/testing/sub_test.go new file mode 100644 index 000000000..1e9a79e47 --- /dev/null +++ b/compiler/natives/src/testing/sub_test.go @@ -0,0 +1,22 @@ +//go:build js +// +build js + +package testing + +func TestBenchmarkReadMemStatsBeforeFirstRun(t *T) { + t.Skip("runtime.ReadMemStats() is not supported by GopherJS.") +} + +func TestTRun(t *T) { + // TODO(nevkontakte): This test performs string comparisons expecting to find + // sub_test.go in the output, but GopherJS currently reports caller + // locations as "test." due to minimal caller and source map support. + t.Skip("GopherJS doesn't support source maps sufficiently.") +} + +func TestBRun(t *T) { + // TODO(nevkontakte): This test performs string comparisons expecting to find + // sub_test.go in the output, but GopherJS currently reports caller + // locations as "test." due to minimal caller and source map support. + t.Skip("GopherJS doesn't support source maps sufficiently.") +} diff --git a/compiler/natives/src/testing/testing.go b/compiler/natives/src/testing/testing.go deleted file mode 100644 index 392f1f87c..000000000 --- a/compiler/natives/src/testing/testing.go +++ /dev/null @@ -1,26 +0,0 @@ -// +build js - -package testing - -import "runtime" - -// The upstream callerName and frameSkip rely on runtime.Callers, -// and panic if there are zero callers found. However, runtime.Callers -// is not implemented for GopherJS at this time, so we can't use -// that implementation. Use these stubs instead. -func callerName(skip int) string { - // Upstream callerName requires a functional runtime.Callers. - // TODO: Implement if possible. - return "" -} - -func (*common) frameSkip(skip int) runtime.Frame { - _, file, line, ok := runtime.Caller(skip) - if !ok { - return runtime.Frame{} - } - return runtime.Frame{ - File: file, - Line: line, - } -} diff --git a/compiler/natives/src/text/template/template.go b/compiler/natives/src/text/template/template.go index 7fa211a52..056fe9c85 100644 --- a/compiler/natives/src/text/template/template.go +++ b/compiler/natives/src/text/template/template.go @@ -1,3 +1,4 @@ +//go:build js // +build js package template diff --git a/compiler/natives/src/time/time.go b/compiler/natives/src/time/time.go index e89889775..40c596e68 100644 --- a/compiler/natives/src/time/time.go +++ b/compiler/natives/src/time/time.go @@ -1,3 +1,4 @@ +//go:build js // +build js package time @@ -21,27 +22,11 @@ type runtimeTimer struct { period int64 f func(interface{}, uintptr) arg interface{} + seq uintptr timeout *js.Object active bool } -func initLocal() { - d := js.Global.Get("Date").New() - s := d.String() - i := indexByte(s, '(') - j := indexByte(s, ')') - if i == -1 || j == -1 { - localLoc.name = "UTC" - return - } - localLoc.name = s[i+1 : j] - localLoc.zone = []zone{{localLoc.name, d.Call("getTimezoneOffset").Int() * -60, false}} -} - -func runtimeNano() int64 { - return js.Global.Get("Date").New().Call("getTime").Int64() * int64(Millisecond) -} - func now() (sec int64, nsec int32, mono int64) { n := runtimeNano() return n / int64(Second), int32(n % int64(Second)), n @@ -79,6 +64,22 @@ func stopTimer(t *runtimeTimer) bool { return wasActive } +func modTimer(t *runtimeTimer, when, period int64, f func(interface{}, uintptr), arg interface{}, seq uintptr) { + stopTimer(t) + t.when = when + t.period = period + t.f = f + t.arg = arg + t.seq = seq + startTimer(t) +} + +func resetTimer(t *runtimeTimer, when int64) bool { + wasActive := t.active + modTimer(t, when, t.period, t.f, t.arg, t.seq) + return wasActive +} + func forceZipFileForTesting(zipOnly bool) { } diff --git a/compiler/natives/src/time/time_test.go b/compiler/natives/src/time/time_test.go index 410a6358f..5d4119cc6 100644 --- a/compiler/natives/src/time/time_test.go +++ b/compiler/natives/src/time/time_test.go @@ -1,3 +1,4 @@ +//go:build js // +build js package time_test @@ -9,3 +10,7 @@ import ( func TestSleep(t *testing.T) { t.Skip("time.Now() is not accurate enough for the test") } + +func TestEnvTZUsage(t *testing.T) { + t.Skip("TZ environment variable in not applicable in the browser context.") +} diff --git a/compiler/natives/src/time/zoneinfo_js.go b/compiler/natives/src/time/zoneinfo_js.go new file mode 100644 index 000000000..0101b95f9 --- /dev/null +++ b/compiler/natives/src/time/zoneinfo_js.go @@ -0,0 +1,57 @@ +//go:build js +// +build js + +package time + +import "github.com/gopherjs/gopherjs/js" + +// The code below is based on the upstream zoneinfo_js.go to closer match +// WebAssembly behavior. + +func initLocal() { + localLoc.name = "Local" + + z := zone{} + d := js.Global.Get("Date").New() + offset := d.Call("getTimezoneOffset").Int() * -1 + z.offset = offset * 60 + // According to https://tc39.github.io/ecma262/#sec-timezoneestring, + // the timezone name from (new Date()).toTimeString() is an implementation-dependent + // result, and in Google Chrome, it gives the fully expanded name rather than + // the abbreviation. + // Hence, we construct the name from the offset. + z.name = "UTC" + if offset < 0 { + z.name += "-" + offset *= -1 + } else { + z.name += "+" + } + z.name += itoa(offset / 60) + min := offset % 60 + if min != 0 { + z.name += ":" + itoa(min) + } + localLoc.zone = []zone{z} +} + +// itoa is like strconv.Itoa but only works for values of i in range [0,99]. +// It panics if i is out of range. +func itoa(i int) string { + if i < 10 { + return digits[i : i+1] + } + return smallsString[i*2 : i*2+2] +} + +const smallsString = "00010203040506070809" + + "10111213141516171819" + + "20212223242526272829" + + "30313233343536373839" + + "40414243444546474849" + + "50515253545556575859" + + "60616263646566676869" + + "70717273747576777879" + + "80818283848586878889" + + "90919293949596979899" +const digits = "0123456789" diff --git a/compiler/natives/src/unicode/unicode.go b/compiler/natives/src/unicode/unicode.go index e92317651..a622c32f1 100644 --- a/compiler/natives/src/unicode/unicode.go +++ b/compiler/natives/src/unicode/unicode.go @@ -1,3 +1,4 @@ +//go:build js // +build js package unicode diff --git a/compiler/natives/src/vendor/golang.org/x/crypto/internal/subtle/aliasing.go b/compiler/natives/src/vendor/golang.org/x/crypto/internal/subtle/aliasing.go new file mode 100644 index 000000000..104ac82bb --- /dev/null +++ b/compiler/natives/src/vendor/golang.org/x/crypto/internal/subtle/aliasing.go @@ -0,0 +1,20 @@ +//go:build js +// +build js + +package subtle + +// This file duplicated is these two locations: +// - src/crypto/internal/subtle/ +// - src/golang.org/x/crypto/internal/subtle/ + +import "github.com/gopherjs/gopherjs/js" + +// AnyOverlap reports whether x and y share memory at any (not necessarily +// corresponding) index. The memory beyond the slice length is ignored. +func AnyOverlap(x, y []byte) bool { + // GopherJS: We can't rely on pointer arithmetic, so use GopherJS slice internals. + return len(x) > 0 && len(y) > 0 && + js.InternalObject(x).Get("$array") == js.InternalObject(y).Get("$array") && + js.InternalObject(x).Get("$offset").Int() <= js.InternalObject(y).Get("$offset").Int()+len(y)-1 && + js.InternalObject(y).Get("$offset").Int() <= js.InternalObject(x).Get("$offset").Int()+len(x)-1 +} diff --git a/compiler/package.go b/compiler/package.go index f841b145b..bb94962da 100644 --- a/compiler/package.go +++ b/compiler/package.go @@ -1,562 +1,293 @@ package compiler import ( - "bytes" - "encoding/json" "fmt" "go/ast" - "go/constant" "go/token" "go/types" - "sort" "strings" - "github.com/gopherjs/gopherjs/compiler/analysis" - "github.com/neelance/astrewrite" - "golang.org/x/tools/go/gcexportdata" "golang.org/x/tools/go/types/typeutil" + + "github.com/gopherjs/gopherjs/compiler/internal/analysis" + "github.com/gopherjs/gopherjs/compiler/internal/dce" + "github.com/gopherjs/gopherjs/compiler/internal/typeparams" + "github.com/gopherjs/gopherjs/compiler/sources" + "github.com/gopherjs/gopherjs/compiler/typesutil" + "github.com/gopherjs/gopherjs/internal/errorList" ) +// pkgContext maintains compiler context for a specific package. type pkgContext struct { *analysis.Info - additionalSelections map[*ast.SelectorExpr]selection - - typeNames []*types.TypeName + dce.Collector + additionalSelections map[*ast.SelectorExpr]typesutil.Selection + + typesCtx *types.Context + // List of type names declared in the package, including those defined inside + // functions. + typeNames typesutil.TypeNames + // Mapping from package import paths to JS variables that were assigned to an + // imported package and can be used to access it. pkgVars map[string]string - objectNames map[types.Object]string varPtrNames map[*types.Var]string anonTypes []*types.TypeName anonTypeMap typeutil.Map escapingVars map[*types.Var]bool indentation int - dependencies map[types.Object]bool minify bool fileSet *token.FileSet - errList ErrorList -} - -func (p *pkgContext) SelectionOf(e *ast.SelectorExpr) (selection, bool) { - if sel, ok := p.Selections[e]; ok { - return sel, true - } - if sel, ok := p.additionalSelections[e]; ok { - return sel, true - } - return nil, false + errList errorList.ErrorList + instanceSet *typeparams.PackageInstanceSets } -type selection interface { - Kind() types.SelectionKind - Recv() types.Type - Index() []int - Obj() types.Object - Type() types.Type +// isMain returns true if this is the main package of the program. +func (pc *pkgContext) isMain() bool { + return pc.Pkg.Name() == "main" } -type fakeSelection struct { - kind types.SelectionKind - recv types.Type - index []int - obj types.Object - typ types.Type -} - -func (sel *fakeSelection) Kind() types.SelectionKind { return sel.kind } -func (sel *fakeSelection) Recv() types.Type { return sel.recv } -func (sel *fakeSelection) Index() []int { return sel.index } -func (sel *fakeSelection) Obj() types.Object { return sel.obj } -func (sel *fakeSelection) Type() types.Type { return sel.typ } - +// funcContext maintains compiler context for a specific function. +// +// An instance of this type roughly corresponds to a lexical scope for generated +// JavaScript code (as defined for `var` declarations). type funcContext struct { *analysis.FuncInfo - p *pkgContext - parent *funcContext - sig *types.Signature - allVars map[string]int - localVars []string - resultNames []ast.Expr - flowDatas map[*types.Label]*flowData - caseCounter int - labelCases map[*types.Label]int - output []byte + // Function instance this context corresponds to, or zero if the context is + // top-level or doesn't correspond to a function. For function literals, this + // is a synthetic object that assigns a unique identity to the function. + instance typeparams.Instance + // JavaScript identifier assigned to the function object (the word after the + // "function" keyword in the generated code). This identifier can be used + // within the function scope to reference the function object. It will also + // appear in the stack trace. + funcRef string + // Surrounding package context. + pkgCtx *pkgContext + // Function context, surrounding this function definition. For package-level + // functions or methods it is the package-level function context (even though + // it technically doesn't correspond to a function). nil for the package-level + // function context. + parent *funcContext + // Signature of the function this context corresponds to or nil for the + // package-level function context. For generic functions it is the original + // generic signature to make sure result variable identity in the signature + // matches the variable objects referenced in the function body. + sig *typesutil.Signature + // All variable names available in the current function scope. The key is a Go + // variable name and the value is the number of synonymous variable names + // visible from this scope (e.g. due to shadowing). This number is used to + // avoid conflicts when assigning JS variable names for Go variables. + allVars map[string]int + // Local JS variable names defined within this function context. This list + // contains JS variable names assigned to Go variables, as well as other + // auxiliary variables the compiler needs. It is used to generate `var` + // declaration at the top of the function, as well as context save/restore. + localVars []string + // AST expressions representing function's named return values. nil if the + // function has no return values or they are not named. + resultNames []ast.Expr + // Function's internal control flow graph used for generation of a "flattened" + // version of the function when the function is blocking or uses goto. + // TODO(nevkontakte): Describe the exact semantics of this map. + flowDatas map[*types.Label]*flowData + // Number of control flow blocks in a "flattened" function. + caseCounter int + // A mapping from Go labels statements (e.g. labelled loop) to the flow block + // id corresponding to it. + labelCases map[*types.Label]int + // Generated code buffer for the current function. + output []byte + // Generated code that should be emitted at the end of the JS statement. delayedOutput []byte - posAvailable bool - pos token.Pos -} - -type flowData struct { - postStmt func() - beginCase int - endCase int -} - -type ImportContext struct { - Packages map[string]*types.Package - Import func(string) (*Archive, error) -} - -// packageImporter implements go/types.Importer interface. -type packageImporter struct { - importContext *ImportContext - importError *error // A pointer to importError in Compile. -} - -func (pi packageImporter) Import(path string) (*types.Package, error) { - if path == "unsafe" { - return types.Unsafe, nil - } - - a, err := pi.importContext.Import(path) - if err != nil { - if *pi.importError == nil { - // If import failed, show first error of import only (https://github.com/gopherjs/gopherjs/issues/119). - *pi.importError = err - } - return nil, err - } - - return pi.importContext.Packages[a.ImportPath], nil + // Set to true if source position is available and should be emitted for the + // source map. + posAvailable bool + // Current position in the Go source code. + pos token.Pos + // For each instantiation of a generic function or method, contains the + // current mapping between type parameters and corresponding type arguments. + // The mapping is used to determine concrete types for expressions within the + // instance's context. Can be nil outside of the generic context, in which + // case calling its methods is safe and simply does no substitution. + typeResolver *typeparams.Resolver + // Mapping from function-level objects to JS variable names they have been assigned. + objectNames map[types.Object]string + // Number of function literals encountered within the current function context. + funcLitCounter int } -func Compile(importPath string, files []*ast.File, fileSet *token.FileSet, importContext *ImportContext, minify bool) (*Archive, error) { - typesInfo := &types.Info{ - Types: make(map[ast.Expr]types.TypeAndValue), - Defs: make(map[*ast.Ident]types.Object), - Uses: make(map[*ast.Ident]types.Object), - Implicits: make(map[ast.Node]types.Object), - Selections: make(map[*ast.SelectorExpr]*types.Selection), - Scopes: make(map[ast.Node]*types.Scope), - } - - var importError error - var errList ErrorList - var previousErr error - config := &types.Config{ - Importer: packageImporter{ - importContext: importContext, - importError: &importError, - }, - Sizes: sizes32, - Error: func(err error) { - if previousErr != nil && previousErr.Error() == err.Error() { - return - } - errList = append(errList, err) - previousErr = err - }, - } - typesPkg, err := config.Check(importPath, fileSet, files, typesInfo) - if importError != nil { - return nil, importError - } - if errList != nil { - if len(errList) > 10 { - pos := token.NoPos - if last, ok := errList[9].(types.Error); ok { - pos = last.Pos - } - errList = append(errList[:10], types.Error{Fset: fileSet, Pos: pos, Msg: "too many errors"}) - } - return nil, errList - } - if err != nil { - return nil, err - } - importContext.Packages[importPath] = typesPkg - - exportData := new(bytes.Buffer) - if err := gcexportdata.Write(exportData, nil, typesPkg); err != nil { - return nil, fmt.Errorf("failed to write export data: %v", err) - } - encodedFileSet := new(bytes.Buffer) - if err := fileSet.Write(json.NewEncoder(encodedFileSet).Encode); err != nil { - return nil, err - } - - simplifiedFiles := make([]*ast.File, len(files)) - for i, file := range files { - simplifiedFiles[i] = astrewrite.Simplify(file, typesInfo, false) - } - - isBlocking := func(f *types.Func) bool { - archive, err := importContext.Import(f.Pkg().Path()) - if err != nil { - panic(err) - } - fullName := f.FullName() - for _, d := range archive.Declarations { - if string(d.FullName) == fullName { - return d.Blocking - } - } - panic(fullName) - } - pkgInfo := analysis.AnalyzePkg(simplifiedFiles, fileSet, typesInfo, typesPkg, isBlocking) - c := &funcContext{ - FuncInfo: pkgInfo.InitFuncInfo, - p: &pkgContext{ - Info: pkgInfo, - additionalSelections: make(map[*ast.SelectorExpr]selection), +func newRootCtx(tContext *types.Context, srcs *sources.Sources, minify bool) *funcContext { + funcCtx := &funcContext{ + FuncInfo: srcs.TypeInfo.InitFuncInfo, + pkgCtx: &pkgContext{ + Info: srcs.TypeInfo, + additionalSelections: make(map[*ast.SelectorExpr]typesutil.Selection), + typesCtx: tContext, pkgVars: make(map[string]string), - objectNames: make(map[types.Object]string), varPtrNames: make(map[*types.Var]string), escapingVars: make(map[*types.Var]bool), indentation: 1, - dependencies: make(map[types.Object]bool), minify: minify, - fileSet: fileSet, + fileSet: srcs.FileSet, + instanceSet: srcs.TypeInfo.InstanceSets, }, allVars: make(map[string]int), flowDatas: map[*types.Label]*flowData{nil: {}}, caseCounter: 1, labelCases: make(map[*types.Label]int), + objectNames: map[types.Object]string{}, } for name := range reservedKeywords { - c.allVars[name] = 1 + funcCtx.allVars[name] = 1 } + return funcCtx +} - // imports - var importDecls []*Decl - var importedPaths []string - for _, importedPkg := range typesPkg.Imports() { - if importedPkg == types.Unsafe { - // Prior to Go 1.9, unsafe import was excluded by Imports() method, - // but now we do it here to maintain previous behavior. - continue - } - c.p.pkgVars[importedPkg.Path()] = c.newVariableWithLevel(importedPkg.Name(), true) - importedPaths = append(importedPaths, importedPkg.Path()) - } - sort.Strings(importedPaths) - for _, impPath := range importedPaths { - id := c.newIdent(fmt.Sprintf(`%s.$init`, c.p.pkgVars[impPath]), types.NewSignature(nil, nil, nil, false)) - call := &ast.CallExpr{Fun: id} - c.Blocking[call] = true - c.Flattened[call] = true - importDecls = append(importDecls, &Decl{ - Vars: []string{c.p.pkgVars[impPath]}, - DeclCode: []byte(fmt.Sprintf("\t%s = $packages[\"%s\"];\n", c.p.pkgVars[impPath], impPath)), - InitCode: c.CatchOutput(1, func() { c.translateStmt(&ast.ExprStmt{X: call}, nil) }), - }) - } +type flowData struct { + postStmt func() + beginCase int + endCase int +} - var functions []*ast.FuncDecl - var vars []*types.Var - for _, file := range simplifiedFiles { - for _, decl := range file.Decls { - switch d := decl.(type) { - case *ast.FuncDecl: - sig := c.p.Defs[d.Name].(*types.Func).Type().(*types.Signature) - var recvType types.Type - if sig.Recv() != nil { - recvType = sig.Recv().Type() - if ptr, isPtr := recvType.(*types.Pointer); isPtr { - recvType = ptr.Elem() - } - } - if sig.Recv() == nil { - c.objectName(c.p.Defs[d.Name].(*types.Func)) // register toplevel name - } - if !isBlank(d.Name) { - functions = append(functions, d) - } - case *ast.GenDecl: - switch d.Tok { - case token.TYPE: - for _, spec := range d.Specs { - o := c.p.Defs[spec.(*ast.TypeSpec).Name].(*types.TypeName) - c.p.typeNames = append(c.p.typeNames, o) - c.objectName(o) // register toplevel name - } - case token.VAR: - for _, spec := range d.Specs { - for _, name := range spec.(*ast.ValueSpec).Names { - if !isBlank(name) { - o := c.p.Defs[name].(*types.Var) - vars = append(vars, o) - c.objectName(o) // register toplevel name - } - } - } - case token.CONST: - // skip, constants are inlined - } - } - } +// Compile the provided Go sources as a single package. +// +// Provided sources must be prepared so that the type information has been determined, +// and the source files have been sorted by name to ensure reproducible JavaScript output. +func Compile(srcs *sources.Sources, tContext *types.Context, minify bool) (_ *Archive, err error) { + defer func() { + e := recover() + if e == nil { + return + } + if fe, ok := bailingOut(e); ok { + // Orderly bailout, return whatever clues we already have. + fmt.Fprintf(fe, `building package %q`, srcs.ImportPath) + err = fe + return + } + // Some other unexpected panic, catch the stack trace and return as an error. + err = bailout(fmt.Errorf("unexpected compiler panic while building package %q: %v", srcs.ImportPath, e)) + }() + + rootCtx := newRootCtx(tContext, srcs, minify) + + importedPaths, importDecls := rootCtx.importDecls() + + vars, functions, typeNames := rootCtx.topLevelObjects(srcs) + // More named types may be added to the list when function bodies are processed. + rootCtx.pkgCtx.typeNames = typeNames + + // Translate functions and variables. + varDecls := rootCtx.varDecls(vars) + funcDecls, err := rootCtx.funcDecls(functions) + if err != nil { + return nil, err } - collectDependencies := func(f func()) []string { - c.p.dependencies = make(map[types.Object]bool) - f() - var deps []string - for o := range c.p.dependencies { - qualifiedName := o.Pkg().Path() + "." + o.Name() - if f, ok := o.(*types.Func); ok && f.Type().(*types.Signature).Recv() != nil { - deps = append(deps, qualifiedName+"~") - continue - } - deps = append(deps, qualifiedName) - } - sort.Strings(deps) - return deps + // It is important that we translate types *after* we've processed all + // functions to make sure we've discovered all types declared inside function + // bodies. + typeDecls, err := rootCtx.namedTypeDecls(rootCtx.pkgCtx.typeNames) + if err != nil { + return nil, err } - // variables - var varDecls []*Decl - varsWithInit := make(map[*types.Var]bool) - for _, init := range c.p.InitOrder { - for _, o := range init.Lhs { - varsWithInit[o] = true - } - } - for _, o := range vars { - var d Decl - if !o.Exported() { - d.Vars = []string{c.objectName(o)} - } - if c.p.HasPointer[o] && !o.Exported() { - d.Vars = append(d.Vars, c.varPtrName(o)) - } - if _, ok := varsWithInit[o]; !ok { - d.DceDeps = collectDependencies(func() { - d.InitCode = []byte(fmt.Sprintf("\t\t%s = %s;\n", c.objectName(o), c.translateExpr(c.zeroValue(o.Type())).String())) - }) + // Finally, anonymous types are translated the last, to make sure we've + // discovered all of them referenced in functions, variable and type + // declarations. + typeDecls = append(typeDecls, rootCtx.anonTypeDecls(rootCtx.pkgCtx.anonTypes)...) + + // Combine all decls in a single list in the order they must appear in the + // final program. + allDecls := append(append(append(importDecls, typeDecls...), varDecls...), funcDecls...) + + if minify { + for _, d := range allDecls { + *d = d.minify() } - d.DceObjectFilter = o.Name() - varDecls = append(varDecls, &d) } - for _, init := range c.p.InitOrder { - lhs := make([]ast.Expr, len(init.Lhs)) - for i, o := range init.Lhs { - ident := ast.NewIdent(o.Name()) - c.p.Defs[ident] = o - lhs[i] = c.setType(ident, o.Type()) - varsWithInit[o] = true - } - var d Decl - d.DceDeps = collectDependencies(func() { - c.localVars = nil - d.InitCode = c.CatchOutput(1, func() { - c.translateStmt(&ast.AssignStmt{ - Lhs: lhs, - Tok: token.DEFINE, - Rhs: []ast.Expr{init.Rhs}, - }, nil) - }) - d.Vars = append(d.Vars, c.localVars...) - }) - if len(init.Lhs) == 1 { - if !analysis.HasSideEffect(init.Rhs, c.p.Info.Info) { - d.DceObjectFilter = init.Lhs[0].Name() - } - } - varDecls = append(varDecls, &d) + + if len(rootCtx.pkgCtx.errList) != 0 { + return nil, rootCtx.pkgCtx.errList } - // functions - var funcDecls []*Decl - var mainFunc *types.Func - for _, fun := range functions { - o := c.p.Defs[fun.Name].(*types.Func) - funcInfo := c.p.FuncDeclInfos[o] - d := Decl{ - FullName: o.FullName(), - Blocking: len(funcInfo.Blocking) != 0, - } - if fun.Recv == nil { - d.Vars = []string{c.objectName(o)} - d.DceObjectFilter = o.Name() - switch o.Name() { - case "main": - mainFunc = o - d.DceObjectFilter = "" - case "init": - d.InitCode = c.CatchOutput(1, func() { - id := c.newIdent("", types.NewSignature(nil, nil, nil, false)) - c.p.Uses[id] = o - call := &ast.CallExpr{Fun: id} - if len(c.p.FuncDeclInfos[o].Blocking) != 0 { - c.Blocking[call] = true - } - c.translateStmt(&ast.ExprStmt{X: call}, nil) - }) - d.DceObjectFilter = "" - } - } - if fun.Recv != nil { - recvType := o.Type().(*types.Signature).Recv().Type() - ptr, isPointer := recvType.(*types.Pointer) - namedRecvType, _ := recvType.(*types.Named) - if isPointer { - namedRecvType = ptr.Elem().(*types.Named) - } - d.DceObjectFilter = namedRecvType.Obj().Name() - if !fun.Name.IsExported() { - d.DceMethodFilter = o.Name() + "~" - } - } + return &Archive{ + ImportPath: srcs.ImportPath, + Name: srcs.Package.Name(), + Imports: importedPaths, + Package: srcs.Package, + Declarations: allDecls, + FileSet: srcs.FileSet, + Minified: minify, + GoLinknames: srcs.GoLinknames, + }, nil +} - d.DceDeps = collectDependencies(func() { - d.DeclCode = c.translateToplevelFunction(fun, funcInfo) - }) - funcDecls = append(funcDecls, &d) +// PrepareAllSources prepares all sources for compilation by +// parsing go linknames, type checking, sorting, simplifying, and +// performing cross package analysis. +// The results are stored in the provided sources. +// +// All sources must be given at the same time for cross package analysis to +// work correctly. For consistency, the sources should be sorted by import path. +func PrepareAllSources(allSources []*sources.Sources, importer sources.Importer, tContext *types.Context) error { + // Sort the files by name in each source to ensure consistent order of processing. + for _, srcs := range allSources { + srcs.Sort() } - if typesPkg.Name() == "main" { - if mainFunc == nil { - return nil, fmt.Errorf("missing main function") - } - id := c.newIdent("", types.NewSignature(nil, nil, nil, false)) - c.p.Uses[id] = mainFunc - call := &ast.CallExpr{Fun: id} - ifStmt := &ast.IfStmt{ - Cond: c.newIdent("$pkg === $mainPkg", types.Typ[types.Bool]), - Body: &ast.BlockStmt{ - List: []ast.Stmt{ - &ast.ExprStmt{X: call}, - &ast.AssignStmt{ - Lhs: []ast.Expr{c.newIdent("$mainFinished", types.Typ[types.Bool])}, - Tok: token.ASSIGN, - Rhs: []ast.Expr{c.newConst(types.Typ[types.Bool], constant.MakeBool(true))}, - }, - }, - }, - } - if len(c.p.FuncDeclInfos[mainFunc].Blocking) != 0 { - c.Blocking[call] = true - c.Flattened[ifStmt] = true + + // This will be performed recursively for all dependencies + // to get the packages for the sources. + // Since some packages might not be recursively reached via the root sources, + // e.g. runtime, we need to try to TypeCheck all of them here. + // Any sources that have already been type checked will no-op. + for _, srcs := range allSources { + if err := srcs.TypeCheck(importer, sizes32, tContext); err != nil { + return err } - funcDecls = append(funcDecls, &Decl{ - InitCode: c.CatchOutput(1, func() { - c.translateStmt(ifStmt, nil) - }), - }) } - // named types - var typeDecls []*Decl - for _, o := range c.p.typeNames { - if o.IsAlias() { - continue + // Extract all go:linkname compiler directives from the package source. + for _, srcs := range allSources { + if err := srcs.ParseGoLinknames(); err != nil { + return err } - typeName := c.objectName(o) - d := Decl{ - Vars: []string{typeName}, - DceObjectFilter: o.Name(), - } - d.DceDeps = collectDependencies(func() { - d.DeclCode = c.CatchOutput(0, func() { - typeName := c.objectName(o) - lhs := typeName - if isPkgLevel(o) { - lhs += " = $pkg." + encodeIdent(o.Name()) - } - size := int64(0) - constructor := "null" - switch t := o.Type().Underlying().(type) { - case *types.Struct: - params := make([]string, t.NumFields()) - for i := 0; i < t.NumFields(); i++ { - params[i] = fieldName(t, i) + "_" - } - constructor = fmt.Sprintf("function(%s) {\n\t\tthis.$val = this;\n\t\tif (arguments.length === 0) {\n", strings.Join(params, ", ")) - for i := 0; i < t.NumFields(); i++ { - constructor += fmt.Sprintf("\t\t\tthis.%s = %s;\n", fieldName(t, i), c.translateExpr(c.zeroValue(t.Field(i).Type())).String()) - } - constructor += "\t\t\treturn;\n\t\t}\n" - for i := 0; i < t.NumFields(); i++ { - constructor += fmt.Sprintf("\t\tthis.%[1]s = %[1]s_;\n", fieldName(t, i)) - } - constructor += "\t}" - case *types.Basic, *types.Array, *types.Slice, *types.Chan, *types.Signature, *types.Interface, *types.Pointer, *types.Map: - size = sizes32.Sizeof(t) - } - c.Printf(`%s = $newType(%d, %s, "%s.%s", %t, "%s", %t, %s);`, lhs, size, typeKind(o.Type()), o.Pkg().Name(), o.Name(), o.Name() != "", o.Pkg().Path(), o.Exported(), constructor) - }) - d.MethodListCode = c.CatchOutput(0, func() { - named := o.Type().(*types.Named) - if _, ok := named.Underlying().(*types.Interface); ok { - return - } - var methods []string - var ptrMethods []string - for i := 0; i < named.NumMethods(); i++ { - method := named.Method(i) - name := method.Name() - if reservedKeywords[name] { - name += "$" - } - pkgPath := "" - if !method.Exported() { - pkgPath = method.Pkg().Path() - } - t := method.Type().(*types.Signature) - entry := fmt.Sprintf(`{prop: "%s", name: %s, pkg: "%s", typ: $funcType(%s)}`, name, encodeString(method.Name()), pkgPath, c.initArgs(t)) - if _, isPtr := t.Recv().Type().(*types.Pointer); isPtr { - ptrMethods = append(ptrMethods, entry) - continue - } - methods = append(methods, entry) - } - if len(methods) > 0 { - c.Printf("%s.methods = [%s];", c.typeName(named), strings.Join(methods, ", ")) - } - if len(ptrMethods) > 0 { - c.Printf("%s.methods = [%s];", c.typeName(types.NewPointer(named)), strings.Join(ptrMethods, ", ")) - } - }) - switch t := o.Type().Underlying().(type) { - case *types.Array, *types.Chan, *types.Interface, *types.Map, *types.Pointer, *types.Slice, *types.Signature, *types.Struct: - d.TypeInitCode = c.CatchOutput(0, func() { - c.Printf("%s.init(%s);", c.objectName(o), c.initArgs(t)) - }) - } - }) - typeDecls = append(typeDecls, &d) } - // anonymous types - for _, t := range c.p.anonTypes { - d := Decl{ - Vars: []string{t.Name()}, - DceObjectFilter: t.Name(), - } - d.DceDeps = collectDependencies(func() { - d.DeclCode = []byte(fmt.Sprintf("\t%s = $%sType(%s);\n", t.Name(), strings.ToLower(typeKind(t.Type())[5:]), c.initArgs(t.Type()))) - }) - typeDecls = append(typeDecls, &d) + // Simply the source files. + for _, srcs := range allSources { + srcs.Simplify() } - var allDecls []*Decl - for _, d := range append(append(append(importDecls, typeDecls...), varDecls...), funcDecls...) { - d.DeclCode = removeWhitespace(d.DeclCode, minify) - d.MethodListCode = removeWhitespace(d.MethodListCode, minify) - d.TypeInitCode = removeWhitespace(d.TypeInitCode, minify) - d.InitCode = removeWhitespace(d.InitCode, minify) - allDecls = append(allDecls, d) + // Collect all the generic type instances from all the packages. + // This must be done for all sources prior to any analysis. + instances := &typeparams.PackageInstanceSets{} + for _, srcs := range allSources { + srcs.CollectInstances(tContext, instances) } - if len(c.p.errList) != 0 { - return nil, c.p.errList + // Analyze the package to determine type parameters instances, blocking, + // and other type information. This will not populate the information. + for _, srcs := range allSources { + srcs.Analyze(importer, tContext, instances) } - return &Archive{ - ImportPath: importPath, - Name: typesPkg.Name(), - Imports: importedPaths, - ExportData: exportData.Bytes(), - Declarations: allDecls, - FileSet: encodedFileSet.Bytes(), - Minified: minify, - }, nil + // Propagate the analysis information across all packages. + allInfo := make([]*analysis.Info, len(allSources)) + for i, src := range allSources { + allInfo[i] = src.TypeInfo + } + analysis.PropagateAnalysis(allInfo) + return nil } -func (c *funcContext) initArgs(ty types.Type) string { +func (fc *funcContext) initArgs(ty types.Type) string { switch t := ty.(type) { case *types.Array: - return fmt.Sprintf("%s, %d", c.typeName(t.Elem()), t.Len()) + return fmt.Sprintf("%s, %d", fc.typeName(t.Elem()), t.Len()) case *types.Chan: - return fmt.Sprintf("%s, %t, %t", c.typeName(t.Elem()), t.Dir()&types.SendOnly != 0, t.Dir()&types.RecvOnly != 0) + return fmt.Sprintf("%s, %t, %t", fc.typeName(t.Elem()), t.Dir()&types.SendOnly != 0, t.Dir()&types.RecvOnly != 0) case *types.Interface: methods := make([]string, t.NumMethods()) for i := range methods { @@ -565,23 +296,23 @@ func (c *funcContext) initArgs(ty types.Type) string { if !method.Exported() { pkgPath = method.Pkg().Path() } - methods[i] = fmt.Sprintf(`{prop: "%s", name: "%s", pkg: "%s", typ: $funcType(%s)}`, method.Name(), method.Name(), pkgPath, c.initArgs(method.Type())) + methods[i] = fmt.Sprintf(`{prop: "%s", name: "%s", pkg: "%s", typ: $funcType(%s)}`, method.Name(), method.Name(), pkgPath, fc.initArgs(method.Type())) } return fmt.Sprintf("[%s]", strings.Join(methods, ", ")) case *types.Map: - return fmt.Sprintf("%s, %s", c.typeName(t.Key()), c.typeName(t.Elem())) + return fmt.Sprintf("%s, %s", fc.typeName(t.Key()), fc.typeName(t.Elem())) case *types.Pointer: - return fmt.Sprintf("%s", c.typeName(t.Elem())) + return fc.typeName(t.Elem()) case *types.Slice: - return fmt.Sprintf("%s", c.typeName(t.Elem())) + return fc.typeName(t.Elem()) case *types.Signature: params := make([]string, t.Params().Len()) for i := range params { - params[i] = c.typeName(t.Params().At(i).Type()) + params[i] = fc.typeName(t.Params().At(i).Type()) } results := make([]string, t.Results().Len()) for i := range results { - results[i] = c.typeName(t.Results().At(i).Type()) + results[i] = fc.typeName(t.Results().At(i).Type()) } return fmt.Sprintf("[%s], [%s], %t", strings.Join(params, ", "), strings.Join(results, ", "), t.Variadic()) case *types.Struct: @@ -592,218 +323,20 @@ func (c *funcContext) initArgs(ty types.Type) string { if !field.Exported() { pkgPath = field.Pkg().Path() } - fields[i] = fmt.Sprintf(`{prop: "%s", name: %s, embedded: %t, exported: %t, typ: %s, tag: %s}`, fieldName(t, i), encodeString(field.Name()), field.Anonymous(), field.Exported(), c.typeName(field.Type()), encodeString(t.Tag(i))) + ft := fc.fieldType(t, i) + fields[i] = fmt.Sprintf(`{prop: "%s", name: %s, embedded: %t, exported: %t, typ: %s, tag: %s}`, + fieldName(t, i), encodeString(field.Name()), field.Anonymous(), field.Exported(), fc.typeName(ft), encodeString(t.Tag(i))) } return fmt.Sprintf(`"%s", [%s]`, pkgPath, strings.Join(fields, ", ")) - default: - panic("invalid type") - } -} - -func (c *funcContext) translateToplevelFunction(fun *ast.FuncDecl, info *analysis.FuncInfo) []byte { - o := c.p.Defs[fun.Name].(*types.Func) - sig := o.Type().(*types.Signature) - var recv *ast.Ident - if fun.Recv != nil && fun.Recv.List[0].Names != nil { - recv = fun.Recv.List[0].Names[0] - } - - var joinedParams string - primaryFunction := func(funcRef string) []byte { - if fun.Body == nil { - return []byte(fmt.Sprintf("\t%s = function() {\n\t\t$throwRuntimeError(\"native function not implemented: %s\");\n\t};\n", funcRef, o.FullName())) - } - - params, fun := translateFunction(fun.Type, recv, fun.Body, c, sig, info, funcRef) - joinedParams = strings.Join(params, ", ") - return []byte(fmt.Sprintf("\t%s = %s;\n", funcRef, fun)) - } - - code := bytes.NewBuffer(nil) - - if fun.Recv == nil { - funcRef := c.objectName(o) - code.Write(primaryFunction(funcRef)) - if fun.Name.IsExported() { - fmt.Fprintf(code, "\t$pkg.%s = %s;\n", encodeIdent(fun.Name.Name), funcRef) - } - return code.Bytes() - } - - recvType := sig.Recv().Type() - ptr, isPointer := recvType.(*types.Pointer) - namedRecvType, _ := recvType.(*types.Named) - if isPointer { - namedRecvType = ptr.Elem().(*types.Named) - } - typeName := c.objectName(namedRecvType.Obj()) - funName := fun.Name.Name - if reservedKeywords[funName] { - funName += "$" - } - - if _, isStruct := namedRecvType.Underlying().(*types.Struct); isStruct { - code.Write(primaryFunction(typeName + ".ptr.prototype." + funName)) - fmt.Fprintf(code, "\t%s.prototype.%s = function(%s) { return this.$val.%s(%s); };\n", typeName, funName, joinedParams, funName, joinedParams) - return code.Bytes() - } - - if isPointer { - if _, isArray := ptr.Elem().Underlying().(*types.Array); isArray { - code.Write(primaryFunction(typeName + ".prototype." + funName)) - fmt.Fprintf(code, "\t$ptrType(%s).prototype.%s = function(%s) { return (new %s(this.$get())).%s(%s); };\n", typeName, funName, joinedParams, typeName, funName, joinedParams) - return code.Bytes() - } - return primaryFunction(fmt.Sprintf("$ptrType(%s).prototype.%s", typeName, funName)) - } - - value := "this.$get()" - if isWrapped(recvType) { - value = fmt.Sprintf("new %s(%s)", typeName, value) - } - code.Write(primaryFunction(typeName + ".prototype." + funName)) - fmt.Fprintf(code, "\t$ptrType(%s).prototype.%s = function(%s) { return %s.%s(%s); };\n", typeName, funName, joinedParams, value, funName, joinedParams) - return code.Bytes() -} - -func translateFunction(typ *ast.FuncType, recv *ast.Ident, body *ast.BlockStmt, outerContext *funcContext, sig *types.Signature, info *analysis.FuncInfo, funcRef string) ([]string, string) { - if info == nil { - panic("nil info") - } - - c := &funcContext{ - FuncInfo: info, - p: outerContext.p, - parent: outerContext, - sig: sig, - allVars: make(map[string]int, len(outerContext.allVars)), - localVars: []string{}, - flowDatas: map[*types.Label]*flowData{nil: {}}, - caseCounter: 1, - labelCases: make(map[*types.Label]int), - } - for k, v := range outerContext.allVars { - c.allVars[k] = v - } - prevEV := c.p.escapingVars - - var params []string - for _, param := range typ.Params.List { - if len(param.Names) == 0 { - params = append(params, c.newVariable("param")) - continue - } - for _, ident := range param.Names { - if isBlank(ident) { - params = append(params, c.newVariable("param")) - continue - } - params = append(params, c.objectName(c.p.Defs[ident])) - } - } - - bodyOutput := string(c.CatchOutput(1, func() { - if len(c.Blocking) != 0 { - c.p.Scopes[body] = c.p.Scopes[typ] - c.handleEscapingVars(body) - } - - if c.sig != nil && c.sig.Results().Len() != 0 && c.sig.Results().At(0).Name() != "" { - c.resultNames = make([]ast.Expr, c.sig.Results().Len()) - for i := 0; i < c.sig.Results().Len(); i++ { - result := c.sig.Results().At(i) - c.Printf("%s = %s;", c.objectName(result), c.translateExpr(c.zeroValue(result.Type())).String()) - id := ast.NewIdent("") - c.p.Uses[id] = result - c.resultNames[i] = c.setType(id, result.Type()) - } - } - - if recv != nil && !isBlank(recv) { - this := "this" - if isWrapped(c.p.TypeOf(recv)) { - this = "this.$val" - } - c.Printf("%s = %s;", c.translateExpr(recv), this) - } - - c.translateStmtList(body.List) - if len(c.Flattened) != 0 && !endsWithReturn(body.List) { - c.translateStmt(&ast.ReturnStmt{}, nil) - } - })) - - sort.Strings(c.localVars) - - var prefix, suffix, functionName string - - if len(c.Flattened) != 0 { - c.localVars = append(c.localVars, "$s") - prefix = prefix + " $s = 0;" - } - - if c.HasDefer { - c.localVars = append(c.localVars, "$deferred") - suffix = " }" + suffix - if len(c.Blocking) != 0 { - suffix = " }" + suffix - } - } - - if len(c.Blocking) != 0 { - c.localVars = append(c.localVars, "$r") - if funcRef == "" { - funcRef = "$b" - functionName = " $b" - } - var stores, loads string - for _, v := range c.localVars { - loads += fmt.Sprintf("%s = $f.%s; ", v, v) - stores += fmt.Sprintf("$f.%s = %s; ", v, v) - } - prefix = prefix + " var $f, $c = false; if (this !== undefined && this.$blk !== undefined) { $f = this; $c = true; " + loads + "}" - suffix = " if ($f === undefined) { $f = { $blk: " + funcRef + " }; } " + stores + "return $f;" + suffix - } - - if c.HasDefer { - prefix = prefix + " var $err = null; try {" - deferSuffix := " } catch(err) { $err = err;" - if len(c.Blocking) != 0 { - deferSuffix += " $s = -1;" - } - if c.resultNames == nil && c.sig.Results().Len() > 0 { - deferSuffix += fmt.Sprintf(" return%s;", c.translateResults(nil)) - } - deferSuffix += " } finally { $callDeferred($deferred, $err);" - if c.resultNames != nil { - deferSuffix += fmt.Sprintf(" if (!$curGoroutine.asleep) { return %s; }", c.translateResults(c.resultNames)) - } - if len(c.Blocking) != 0 { - deferSuffix += " if($curGoroutine.asleep) {" + case *types.TypeParam: + tr := fc.typeResolver.Substitute(ty) + if tr != ty { + return fc.initArgs(tr) } - suffix = deferSuffix + suffix - } - - if len(c.Flattened) != 0 { - prefix = prefix + " s: while (true) { switch ($s) { case 0:" - suffix = " } return; }" + suffix - } - - if c.HasDefer { - prefix = prefix + " $deferred = []; $deferred.index = $curGoroutine.deferStack.length; $curGoroutine.deferStack.push($deferred);" - } - - if prefix != "" { - bodyOutput = strings.Repeat("\t", c.p.indentation+1) + "/* */" + prefix + "\n" + bodyOutput - } - if suffix != "" { - bodyOutput = bodyOutput + strings.Repeat("\t", c.p.indentation+1) + "/* */" + suffix + "\n" - } - if len(c.localVars) != 0 { - bodyOutput = fmt.Sprintf("%svar %s;\n", strings.Repeat("\t", c.p.indentation+1), strings.Join(c.localVars, ", ")) + bodyOutput + err := bailout(fmt.Errorf(`"%v" has unexpected generic type parameter %T`, ty, ty)) + panic(err) + default: + err := bailout(fmt.Errorf("%v has unexpected type %T", ty, ty)) + panic(err) } - - c.p.escapingVars = prevEV - - return params, fmt.Sprintf("function%s(%s) {\n%s%s}", functionName, strings.Join(params, ", "), bodyOutput, strings.Repeat("\t", c.p.indentation)) } diff --git a/compiler/prelude/genmin.go b/compiler/prelude/genmin.go deleted file mode 100644 index 739dbf216..000000000 --- a/compiler/prelude/genmin.go +++ /dev/null @@ -1,63 +0,0 @@ -// +build ignore - -package main - -import ( - "bytes" - "fmt" - "go/build" - "io/ioutil" - "log" - "os/exec" - "path/filepath" - "strings" - - "github.com/gopherjs/gopherjs/compiler/prelude" -) - -func main() { - if err := run(); err != nil { - log.Fatalln(err) - } -} - -func run() error { - bpkg, err := build.Import("github.com/gopherjs/gopherjs", "", build.FindOnly) - if err != nil { - return fmt.Errorf("failed to locate path for github.com/gopherjs/gopherjs: %v", err) - } - - preludeDir := filepath.Join(bpkg.Dir, "compiler", "prelude") - - args := []string{ - filepath.Join(bpkg.Dir, "node_modules", ".bin", "uglifyjs"), - "--config-file", - filepath.Join(preludeDir, "uglifyjs_options.json"), - } - - stderr := new(bytes.Buffer) - cmd := exec.Command(args[0], args[1:]...) - cmd.Stdin = strings.NewReader(prelude.Prelude) - cmd.Stderr = stderr - - out, err := cmd.Output() - if err != nil { - return fmt.Errorf("failed to run %v: %v\n%s", strings.Join(args, " "), err, stderr.String()) - } - - fn := "prelude_min.go" - - outStr := fmt.Sprintf(`// Code generated by genmin; DO NOT EDIT. - -package prelude - -// Minified is an uglifyjs-minified version of Prelude. -const Minified = %q -`, out) - - if err := ioutil.WriteFile(fn, []byte(outStr), 0644); err != nil { - return fmt.Errorf("failed to write to %v: %v", fn, err) - } - - return nil -} diff --git a/compiler/prelude/goroutines.go b/compiler/prelude/goroutines.go deleted file mode 100644 index d9780b65d..000000000 --- a/compiler/prelude/goroutines.go +++ /dev/null @@ -1,358 +0,0 @@ -package prelude - -const goroutines = ` -var $stackDepthOffset = 0; -var $getStackDepth = function() { - var err = new Error(); - if (err.stack === undefined) { - return undefined; - } - return $stackDepthOffset + err.stack.split("\n").length; -}; - -var $panicStackDepth = null, $panicValue; -var $callDeferred = function(deferred, jsErr, fromPanic) { - if (!fromPanic && deferred !== null && deferred.index >= $curGoroutine.deferStack.length) { - throw jsErr; - } - if (jsErr !== null) { - var newErr = null; - try { - $curGoroutine.deferStack.push(deferred); - $panic(new $jsErrorPtr(jsErr)); - } catch (err) { - newErr = err; - } - $curGoroutine.deferStack.pop(); - $callDeferred(deferred, newErr); - return; - } - if ($curGoroutine.asleep) { - return; - } - - $stackDepthOffset--; - var outerPanicStackDepth = $panicStackDepth; - var outerPanicValue = $panicValue; - - var localPanicValue = $curGoroutine.panicStack.pop(); - if (localPanicValue !== undefined) { - $panicStackDepth = $getStackDepth(); - $panicValue = localPanicValue; - } - - try { - while (true) { - if (deferred === null) { - deferred = $curGoroutine.deferStack[$curGoroutine.deferStack.length - 1]; - if (deferred === undefined) { - /* The panic reached the top of the stack. Clear it and throw it as a JavaScript error. */ - $panicStackDepth = null; - if (localPanicValue.Object instanceof Error) { - throw localPanicValue.Object; - } - var msg; - if (localPanicValue.constructor === $String) { - msg = localPanicValue.$val; - } else if (localPanicValue.Error !== undefined) { - msg = localPanicValue.Error(); - } else if (localPanicValue.String !== undefined) { - msg = localPanicValue.String(); - } else { - msg = localPanicValue; - } - throw new Error(msg); - } - } - var call = deferred.pop(); - if (call === undefined) { - $curGoroutine.deferStack.pop(); - if (localPanicValue !== undefined) { - deferred = null; - continue; - } - return; - } - var r = call[0].apply(call[2], call[1]); - if (r && r.$blk !== undefined) { - deferred.push([r.$blk, [], r]); - if (fromPanic) { - throw null; - } - return; - } - - if (localPanicValue !== undefined && $panicStackDepth === null) { - throw null; /* error was recovered */ - } - } - } finally { - if (localPanicValue !== undefined) { - if ($panicStackDepth !== null) { - $curGoroutine.panicStack.push(localPanicValue); - } - $panicStackDepth = outerPanicStackDepth; - $panicValue = outerPanicValue; - } - $stackDepthOffset++; - } -}; - -var $panic = function(value) { - $curGoroutine.panicStack.push(value); - $callDeferred(null, null, true); -}; -var $recover = function() { - if ($panicStackDepth === null || ($panicStackDepth !== undefined && $panicStackDepth !== $getStackDepth() - 2)) { - return $ifaceNil; - } - $panicStackDepth = null; - return $panicValue; -}; -var $throw = function(err) { throw err; }; - -var $noGoroutine = { asleep: false, exit: false, deferStack: [], panicStack: [] }; -var $curGoroutine = $noGoroutine, $totalGoroutines = 0, $awakeGoroutines = 0, $checkForDeadlock = true; -var $mainFinished = false; -var $go = function(fun, args) { - $totalGoroutines++; - $awakeGoroutines++; - var $goroutine = function() { - try { - $curGoroutine = $goroutine; - var r = fun.apply(undefined, args); - if (r && r.$blk !== undefined) { - fun = function() { return r.$blk(); }; - args = []; - return; - } - $goroutine.exit = true; - } catch (err) { - if (!$goroutine.exit) { - throw err; - } - } finally { - $curGoroutine = $noGoroutine; - if ($goroutine.exit) { /* also set by runtime.Goexit() */ - $totalGoroutines--; - $goroutine.asleep = true; - } - if ($goroutine.asleep) { - $awakeGoroutines--; - if (!$mainFinished && $awakeGoroutines === 0 && $checkForDeadlock) { - console.error("fatal error: all goroutines are asleep - deadlock!"); - if ($global.process !== undefined) { - $global.process.exit(2); - } - } - } - } - }; - $goroutine.asleep = false; - $goroutine.exit = false; - $goroutine.deferStack = []; - $goroutine.panicStack = []; - $schedule($goroutine); -}; - -var $scheduled = []; -var $runScheduled = function() { - try { - var r; - while ((r = $scheduled.shift()) !== undefined) { - r(); - } - } finally { - if ($scheduled.length > 0) { - setTimeout($runScheduled, 0); - } - } -}; - -var $schedule = function(goroutine) { - if (goroutine.asleep) { - goroutine.asleep = false; - $awakeGoroutines++; - } - $scheduled.push(goroutine); - if ($curGoroutine === $noGoroutine) { - $runScheduled(); - } -}; - -var $setTimeout = function(f, t) { - $awakeGoroutines++; - return setTimeout(function() { - $awakeGoroutines--; - f(); - }, t); -}; - -var $block = function() { - if ($curGoroutine === $noGoroutine) { - $throwRuntimeError("cannot block in JavaScript callback, fix by wrapping code in goroutine"); - } - $curGoroutine.asleep = true; -}; - -var $send = function(chan, value) { - if (chan.$closed) { - $throwRuntimeError("send on closed channel"); - } - var queuedRecv = chan.$recvQueue.shift(); - if (queuedRecv !== undefined) { - queuedRecv([value, true]); - return; - } - if (chan.$buffer.length < chan.$capacity) { - chan.$buffer.push(value); - return; - } - - var thisGoroutine = $curGoroutine; - var closedDuringSend; - chan.$sendQueue.push(function(closed) { - closedDuringSend = closed; - $schedule(thisGoroutine); - return value; - }); - $block(); - return { - $blk: function() { - if (closedDuringSend) { - $throwRuntimeError("send on closed channel"); - } - } - }; -}; -var $recv = function(chan) { - var queuedSend = chan.$sendQueue.shift(); - if (queuedSend !== undefined) { - chan.$buffer.push(queuedSend(false)); - } - var bufferedValue = chan.$buffer.shift(); - if (bufferedValue !== undefined) { - return [bufferedValue, true]; - } - if (chan.$closed) { - return [chan.$elem.zero(), false]; - } - - var thisGoroutine = $curGoroutine; - var f = { $blk: function() { return this.value; } }; - var queueEntry = function(v) { - f.value = v; - $schedule(thisGoroutine); - }; - chan.$recvQueue.push(queueEntry); - $block(); - return f; -}; -var $close = function(chan) { - if (chan.$closed) { - $throwRuntimeError("close of closed channel"); - } - chan.$closed = true; - while (true) { - var queuedSend = chan.$sendQueue.shift(); - if (queuedSend === undefined) { - break; - } - queuedSend(true); /* will panic */ - } - while (true) { - var queuedRecv = chan.$recvQueue.shift(); - if (queuedRecv === undefined) { - break; - } - queuedRecv([chan.$elem.zero(), false]); - } -}; -var $select = function(comms) { - var ready = []; - var selection = -1; - for (var i = 0; i < comms.length; i++) { - var comm = comms[i]; - var chan = comm[0]; - switch (comm.length) { - case 0: /* default */ - selection = i; - break; - case 1: /* recv */ - if (chan.$sendQueue.length !== 0 || chan.$buffer.length !== 0 || chan.$closed) { - ready.push(i); - } - break; - case 2: /* send */ - if (chan.$closed) { - $throwRuntimeError("send on closed channel"); - } - if (chan.$recvQueue.length !== 0 || chan.$buffer.length < chan.$capacity) { - ready.push(i); - } - break; - } - } - - if (ready.length !== 0) { - selection = ready[Math.floor(Math.random() * ready.length)]; - } - if (selection !== -1) { - var comm = comms[selection]; - switch (comm.length) { - case 0: /* default */ - return [selection]; - case 1: /* recv */ - return [selection, $recv(comm[0])]; - case 2: /* send */ - $send(comm[0], comm[1]); - return [selection]; - } - } - - var entries = []; - var thisGoroutine = $curGoroutine; - var f = { $blk: function() { return this.selection; } }; - var removeFromQueues = function() { - for (var i = 0; i < entries.length; i++) { - var entry = entries[i]; - var queue = entry[0]; - var index = queue.indexOf(entry[1]); - if (index !== -1) { - queue.splice(index, 1); - } - } - }; - for (var i = 0; i < comms.length; i++) { - (function(i) { - var comm = comms[i]; - switch (comm.length) { - case 1: /* recv */ - var queueEntry = function(value) { - f.selection = [i, value]; - removeFromQueues(); - $schedule(thisGoroutine); - }; - entries.push([comm[0].$recvQueue, queueEntry]); - comm[0].$recvQueue.push(queueEntry); - break; - case 2: /* send */ - var queueEntry = function() { - if (comm[0].$closed) { - $throwRuntimeError("send on closed channel"); - } - f.selection = [i]; - removeFromQueues(); - $schedule(thisGoroutine); - return comm[1]; - }; - entries.push([comm[0].$sendQueue, queueEntry]); - comm[0].$sendQueue.push(queueEntry); - break; - } - })(i); - } - $block(); - return f; -}; -` diff --git a/compiler/prelude/goroutines.js b/compiler/prelude/goroutines.js new file mode 100644 index 000000000..65dabe36e --- /dev/null +++ b/compiler/prelude/goroutines.js @@ -0,0 +1,389 @@ +var $stackDepthOffset = 0; +var $getStackDepth = () => { + var err = new Error(); + if (err.stack === undefined) { + return undefined; + } + return $stackDepthOffset + err.stack.split("\n").length; +}; + +var $panicStackDepth = null, $panicValue; +var $callDeferred = (deferred, jsErr, fromPanic) => { + if (!fromPanic && deferred !== null && $curGoroutine.deferStack.indexOf(deferred) == -1) { + throw jsErr; + } + if (jsErr !== null) { + var newErr = null; + try { + $panic(new $jsErrorPtr(jsErr)); + } catch (err) { + newErr = err; + } + $callDeferred(deferred, newErr); + return; + } + if ($curGoroutine.asleep) { + return; + } + + $stackDepthOffset--; + var outerPanicStackDepth = $panicStackDepth; + var outerPanicValue = $panicValue; + + var localPanicValue = $curGoroutine.panicStack.pop(); + if (localPanicValue !== undefined) { + $panicStackDepth = $getStackDepth(); + $panicValue = localPanicValue; + } + + try { + while (true) { + if (deferred === null) { + deferred = $curGoroutine.deferStack[$curGoroutine.deferStack.length - 1]; + if (deferred === undefined) { + /* The panic reached the top of the stack. Clear it and throw it as a JavaScript error. */ + $panicStackDepth = null; + if (localPanicValue.Object instanceof Error) { + throw localPanicValue.Object; + } + var msg; + if (localPanicValue.constructor === $String) { + msg = localPanicValue.$val; + } else if (localPanicValue.Error !== undefined) { + msg = localPanicValue.Error(); + } else if (localPanicValue.String !== undefined) { + msg = localPanicValue.String(); + } else { + msg = localPanicValue; + } + throw new Error(msg); + } + } + var call = deferred.pop(); + if (call === undefined) { + $curGoroutine.deferStack.pop(); + if (localPanicValue !== undefined) { + deferred = null; + continue; + } + return; + } + var r = call[0].apply(call[2], call[1]); + if (r && r.$blk !== undefined) { + deferred.push([r.$blk, [], r]); + if (fromPanic) { + throw null; + } + return; + } + + if (localPanicValue !== undefined && $panicStackDepth === null) { + /* error was recovered */ + if (fromPanic) { + throw null; + } + return; + } + } + } catch (e) { + // Deferred function threw a JavaScript exception or tries to unwind stack + // to the point where a panic was handled. + if (fromPanic) { + // Re-throw the exception to reach deferral execution call at the end + // of the function. + throw e; + } + // We are at the end of the function, handle the error or re-throw to + // continue unwinding if necessary, or simply stop unwinding if we got far + // enough. + $callDeferred(deferred, e, fromPanic); + } finally { + if (localPanicValue !== undefined) { + if ($panicStackDepth !== null) { + $curGoroutine.panicStack.push(localPanicValue); + } + $panicStackDepth = outerPanicStackDepth; + $panicValue = outerPanicValue; + } + $stackDepthOffset++; + } +}; + +var $panic = value => { + $curGoroutine.panicStack.push(value); + $callDeferred(null, null, true); +}; +var $recover = () => { + if ($panicStackDepth === null || ($panicStackDepth !== undefined && $panicStackDepth !== $getStackDepth() - 2)) { + return $ifaceNil; + } + $panicStackDepth = null; + return $panicValue; +}; +var $throw = err => { throw err; }; + +var $noGoroutine = { asleep: false, exit: false, deferStack: [], panicStack: [] }; +var $curGoroutine = $noGoroutine, $totalGoroutines = 0, $awakeGoroutines = 0, $checkForDeadlock = true, $exportedFunctions = 0; +var $mainFinished = false; +var $go = (fun, args) => { + $totalGoroutines++; + $awakeGoroutines++; + var $goroutine = () => { + try { + $curGoroutine = $goroutine; + var r = fun(...args); + if (r && r.$blk !== undefined) { + fun = () => { return r.$blk(); }; + args = []; + return; + } + $goroutine.exit = true; + } catch (err) { + if (!$goroutine.exit) { + throw err; + } + } finally { + $curGoroutine = $noGoroutine; + if ($goroutine.exit) { /* also set by runtime.Goexit() */ + $totalGoroutines--; + $goroutine.asleep = true; + } + if ($goroutine.asleep) { + $awakeGoroutines--; + if (!$mainFinished && $awakeGoroutines === 0 && $checkForDeadlock && $exportedFunctions === 0) { + console.error("fatal error: all goroutines are asleep - deadlock!"); + if ($global.process !== undefined) { + $global.process.exit(2); + } + } + } + } + }; + $goroutine.asleep = false; + $goroutine.exit = false; + $goroutine.deferStack = []; + $goroutine.panicStack = []; + $schedule($goroutine); +}; + +var $scheduled = []; +var $runScheduled = () => { + // For nested setTimeout calls browsers enforce 4ms minimum delay. We minimize + // the effect of this penalty by queueing the timer preemptively before we run + // the goroutines, and later cancelling it if it turns out unneeded. See: + // https://developer.mozilla.org/en-US/docs/Web/API/setTimeout#nested_timeouts + var nextRun = setTimeout($runScheduled); + try { + var start = Date.now(); + var r; + while ((r = $scheduled.shift()) !== undefined) { + r(); + // We need to interrupt this loop in order to allow the event loop to + // process timers, IO, etc. However, invoking scheduling through + // setTimeout is ~1000 times more expensive, so we amortize this cost by + // looping until the 4ms minimal delay has elapsed (assuming there are + // scheduled goroutines to run), and then yield to the event loop. + var elapsed = Date.now() - start; + if (elapsed > 4 || elapsed < 0) { break; } + } + } finally { + if ($scheduled.length == 0) { + // Cancel scheduling pass if there's nothing to run. + clearTimeout(nextRun); + } + } +}; + +var $schedule = goroutine => { + if (goroutine.asleep) { + goroutine.asleep = false; + $awakeGoroutines++; + } + $scheduled.push(goroutine); + if ($curGoroutine === $noGoroutine) { + $runScheduled(); + } +}; + +var $setTimeout = (f, t) => { + $awakeGoroutines++; + return setTimeout(() => { + $awakeGoroutines--; + f(); + }, t); +}; + +var $block = () => { + if ($curGoroutine === $noGoroutine) { + $throwRuntimeError("cannot block in JavaScript callback, fix by wrapping code in goroutine"); + } + $curGoroutine.asleep = true; +}; + +var $restore = (context, params) => { + if (context !== undefined && context.$blk !== undefined) { + return context; + } + return params; +} + +var $send = (chan, value) => { + if (chan.$closed) { + $throwRuntimeError("send on closed channel"); + } + var queuedRecv = chan.$recvQueue.shift(); + if (queuedRecv !== undefined) { + queuedRecv([value, true]); + return; + } + if (chan.$buffer.length < chan.$capacity) { + chan.$buffer.push(value); + return; + } + + var thisGoroutine = $curGoroutine; + var closedDuringSend; + chan.$sendQueue.push(closed => { + closedDuringSend = closed; + $schedule(thisGoroutine); + return value; + }); + $block(); + return { + $blk() { + if (closedDuringSend) { + $throwRuntimeError("send on closed channel"); + } + } + }; +}; +var $recv = chan => { + var queuedSend = chan.$sendQueue.shift(); + if (queuedSend !== undefined) { + chan.$buffer.push(queuedSend(false)); + } + var bufferedValue = chan.$buffer.shift(); + if (bufferedValue !== undefined) { + return [bufferedValue, true]; + } + if (chan.$closed) { + return [chan.$elem.zero(), false]; + } + + var thisGoroutine = $curGoroutine; + var f = { $blk() { return this.value; } }; + var queueEntry = v => { + f.value = v; + $schedule(thisGoroutine); + }; + chan.$recvQueue.push(queueEntry); + $block(); + return f; +}; +var $close = chan => { + if (chan.$closed) { + $throwRuntimeError("close of closed channel"); + } + chan.$closed = true; + while (true) { + var queuedSend = chan.$sendQueue.shift(); + if (queuedSend === undefined) { + break; + } + queuedSend(true); /* will panic */ + } + while (true) { + var queuedRecv = chan.$recvQueue.shift(); + if (queuedRecv === undefined) { + break; + } + queuedRecv([chan.$elem.zero(), false]); + } +}; +var $select = comms => { + var ready = []; + var selection = -1; + for (var i = 0; i < comms.length; i++) { + var comm = comms[i]; + var chan = comm[0]; + switch (comm.length) { + case 0: /* default */ + selection = i; + break; + case 1: /* recv */ + if (chan.$sendQueue.length !== 0 || chan.$buffer.length !== 0 || chan.$closed) { + ready.push(i); + } + break; + case 2: /* send */ + if (chan.$closed) { + $throwRuntimeError("send on closed channel"); + } + if (chan.$recvQueue.length !== 0 || chan.$buffer.length < chan.$capacity) { + ready.push(i); + } + break; + } + } + + if (ready.length !== 0) { + selection = ready[Math.floor(Math.random() * ready.length)]; + } + if (selection !== -1) { + var comm = comms[selection]; + switch (comm.length) { + case 0: /* default */ + return [selection]; + case 1: /* recv */ + return [selection, $recv(comm[0])]; + case 2: /* send */ + $send(comm[0], comm[1]); + return [selection]; + } + } + + var entries = []; + var thisGoroutine = $curGoroutine; + var f = { $blk() { return this.selection; } }; + var removeFromQueues = () => { + for (var i = 0; i < entries.length; i++) { + var entry = entries[i]; + var queue = entry[0]; + var index = queue.indexOf(entry[1]); + if (index !== -1) { + queue.splice(index, 1); + } + } + }; + for (var i = 0; i < comms.length; i++) { + (i => { + var comm = comms[i]; + switch (comm.length) { + case 1: /* recv */ + var queueEntry = value => { + f.selection = [i, value]; + removeFromQueues(); + $schedule(thisGoroutine); + }; + entries.push([comm[0].$recvQueue, queueEntry]); + comm[0].$recvQueue.push(queueEntry); + break; + case 2: /* send */ + var queueEntry = () => { + if (comm[0].$closed) { + $throwRuntimeError("send on closed channel"); + } + f.selection = [i]; + removeFromQueues(); + $schedule(thisGoroutine); + return comm[1]; + }; + entries.push([comm[0].$sendQueue, queueEntry]); + comm[0].$sendQueue.push(queueEntry); + break; + } + })(i); + } + $block(); + return f; +}; diff --git a/compiler/prelude/jsmapping.go b/compiler/prelude/jsmapping.go deleted file mode 100644 index dc29cba6b..000000000 --- a/compiler/prelude/jsmapping.go +++ /dev/null @@ -1,379 +0,0 @@ -package prelude - -const jsmapping = ` -var $jsObjectPtr, $jsErrorPtr; - -var $needsExternalization = function(t) { - switch (t.kind) { - case $kindBool: - case $kindInt: - case $kindInt8: - case $kindInt16: - case $kindInt32: - case $kindUint: - case $kindUint8: - case $kindUint16: - case $kindUint32: - case $kindUintptr: - case $kindFloat32: - case $kindFloat64: - return false; - default: - return t !== $jsObjectPtr; - } -}; - -var $externalize = function(v, t) { - if (t === $jsObjectPtr) { - return v; - } - switch (t.kind) { - case $kindBool: - case $kindInt: - case $kindInt8: - case $kindInt16: - case $kindInt32: - case $kindUint: - case $kindUint8: - case $kindUint16: - case $kindUint32: - case $kindUintptr: - case $kindFloat32: - case $kindFloat64: - return v; - case $kindInt64: - case $kindUint64: - return $flatten64(v); - case $kindArray: - if ($needsExternalization(t.elem)) { - return $mapArray(v, function(e) { return $externalize(e, t.elem); }); - } - return v; - case $kindFunc: - return $externalizeFunction(v, t, false); - case $kindInterface: - if (v === $ifaceNil) { - return null; - } - if (v.constructor === $jsObjectPtr) { - return v.$val.object; - } - return $externalize(v.$val, v.constructor); - case $kindMap: - var m = {}; - var keys = $keys(v); - for (var i = 0; i < keys.length; i++) { - var entry = v[keys[i]]; - m[$externalize(entry.k, t.key)] = $externalize(entry.v, t.elem); - } - return m; - case $kindPtr: - if (v === t.nil) { - return null; - } - return $externalize(v.$get(), t.elem); - case $kindSlice: - if ($needsExternalization(t.elem)) { - return $mapArray($sliceToArray(v), function(e) { return $externalize(e, t.elem); }); - } - return $sliceToArray(v); - case $kindString: - if ($isASCII(v)) { - return v; - } - var s = "", r; - for (var i = 0; i < v.length; i += r[1]) { - r = $decodeRune(v, i); - var c = r[0]; - if (c > 0xFFFF) { - var h = Math.floor((c - 0x10000) / 0x400) + 0xD800; - var l = (c - 0x10000) % 0x400 + 0xDC00; - s += String.fromCharCode(h, l); - continue; - } - s += String.fromCharCode(c); - } - return s; - case $kindStruct: - var timePkg = $packages["time"]; - if (timePkg !== undefined && v.constructor === timePkg.Time.ptr) { - var milli = $div64(v.UnixNano(), new $Int64(0, 1000000)); - return new Date($flatten64(milli)); - } - - var noJsObject = {}; - var searchJsObject = function(v, t) { - if (t === $jsObjectPtr) { - return v; - } - switch (t.kind) { - case $kindPtr: - if (v === t.nil) { - return noJsObject; - } - return searchJsObject(v.$get(), t.elem); - case $kindStruct: - var f = t.fields[0]; - return searchJsObject(v[f.prop], f.typ); - case $kindInterface: - return searchJsObject(v.$val, v.constructor); - default: - return noJsObject; - } - }; - var o = searchJsObject(v, t); - if (o !== noJsObject) { - return o; - } - - o = {}; - for (var i = 0; i < t.fields.length; i++) { - var f = t.fields[i]; - if (!f.exported) { - continue; - } - o[f.name] = $externalize(v[f.prop], f.typ); - } - return o; - } - $throwRuntimeError("cannot externalize " + t.string); -}; - -var $externalizeFunction = function(v, t, passThis) { - if (v === $throwNilPointerError) { - return null; - } - if (v.$externalizeWrapper === undefined) { - $checkForDeadlock = false; - v.$externalizeWrapper = function() { - var args = []; - for (var i = 0; i < t.params.length; i++) { - if (t.variadic && i === t.params.length - 1) { - var vt = t.params[i].elem, varargs = []; - for (var j = i; j < arguments.length; j++) { - varargs.push($internalize(arguments[j], vt)); - } - args.push(new (t.params[i])(varargs)); - break; - } - args.push($internalize(arguments[i], t.params[i])); - } - var result = v.apply(passThis ? this : undefined, args); - switch (t.results.length) { - case 0: - return; - case 1: - return $externalize(result, t.results[0]); - default: - for (var i = 0; i < t.results.length; i++) { - result[i] = $externalize(result[i], t.results[i]); - } - return result; - } - }; - } - return v.$externalizeWrapper; -}; - -var $internalize = function(v, t, recv) { - if (t === $jsObjectPtr) { - return v; - } - if (t === $jsObjectPtr.elem) { - $throwRuntimeError("cannot internalize js.Object, use *js.Object instead"); - } - if (v && v.__internal_object__ !== undefined) { - return $assertType(v.__internal_object__, t, false); - } - var timePkg = $packages["time"]; - if (timePkg !== undefined && t === timePkg.Time) { - if (!(v !== null && v !== undefined && v.constructor === Date)) { - $throwRuntimeError("cannot internalize time.Time from " + typeof v + ", must be Date"); - } - return timePkg.Unix(new $Int64(0, 0), new $Int64(0, v.getTime() * 1000000)); - } - switch (t.kind) { - case $kindBool: - return !!v; - case $kindInt: - return parseInt(v); - case $kindInt8: - return parseInt(v) << 24 >> 24; - case $kindInt16: - return parseInt(v) << 16 >> 16; - case $kindInt32: - return parseInt(v) >> 0; - case $kindUint: - return parseInt(v); - case $kindUint8: - return parseInt(v) << 24 >>> 24; - case $kindUint16: - return parseInt(v) << 16 >>> 16; - case $kindUint32: - case $kindUintptr: - return parseInt(v) >>> 0; - case $kindInt64: - case $kindUint64: - return new t(0, v); - case $kindFloat32: - case $kindFloat64: - return parseFloat(v); - case $kindArray: - if (v.length !== t.len) { - $throwRuntimeError("got array with wrong size from JavaScript native"); - } - return $mapArray(v, function(e) { return $internalize(e, t.elem); }); - case $kindFunc: - return function() { - var args = []; - for (var i = 0; i < t.params.length; i++) { - if (t.variadic && i === t.params.length - 1) { - var vt = t.params[i].elem, varargs = arguments[i]; - for (var j = 0; j < varargs.$length; j++) { - args.push($externalize(varargs.$array[varargs.$offset + j], vt)); - } - break; - } - args.push($externalize(arguments[i], t.params[i])); - } - var result = v.apply(recv, args); - switch (t.results.length) { - case 0: - return; - case 1: - return $internalize(result, t.results[0]); - default: - for (var i = 0; i < t.results.length; i++) { - result[i] = $internalize(result[i], t.results[i]); - } - return result; - } - }; - case $kindInterface: - if (t.methods.length !== 0) { - $throwRuntimeError("cannot internalize " + t.string); - } - if (v === null) { - return $ifaceNil; - } - if (v === undefined) { - return new $jsObjectPtr(undefined); - } - switch (v.constructor) { - case Int8Array: - return new ($sliceType($Int8))(v); - case Int16Array: - return new ($sliceType($Int16))(v); - case Int32Array: - return new ($sliceType($Int))(v); - case Uint8Array: - return new ($sliceType($Uint8))(v); - case Uint16Array: - return new ($sliceType($Uint16))(v); - case Uint32Array: - return new ($sliceType($Uint))(v); - case Float32Array: - return new ($sliceType($Float32))(v); - case Float64Array: - return new ($sliceType($Float64))(v); - case Array: - return $internalize(v, $sliceType($emptyInterface)); - case Boolean: - return new $Bool(!!v); - case Date: - if (timePkg === undefined) { - /* time package is not present, internalize as &js.Object{Date} so it can be externalized into original Date. */ - return new $jsObjectPtr(v); - } - return new timePkg.Time($internalize(v, timePkg.Time)); - case Function: - var funcType = $funcType([$sliceType($emptyInterface)], [$jsObjectPtr], true); - return new funcType($internalize(v, funcType)); - case Number: - return new $Float64(parseFloat(v)); - case String: - return new $String($internalize(v, $String)); - default: - if ($global.Node && v instanceof $global.Node) { - return new $jsObjectPtr(v); - } - var mapType = $mapType($String, $emptyInterface); - return new mapType($internalize(v, mapType)); - } - case $kindMap: - var m = {}; - var keys = $keys(v); - for (var i = 0; i < keys.length; i++) { - var k = $internalize(keys[i], t.key); - m[t.key.keyFor(k)] = { k: k, v: $internalize(v[keys[i]], t.elem) }; - } - return m; - case $kindPtr: - if (t.elem.kind === $kindStruct) { - return $internalize(v, t.elem); - } - case $kindSlice: - return new t($mapArray(v, function(e) { return $internalize(e, t.elem); })); - case $kindString: - v = String(v); - if ($isASCII(v)) { - return v; - } - var s = ""; - var i = 0; - while (i < v.length) { - var h = v.charCodeAt(i); - if (0xD800 <= h && h <= 0xDBFF) { - var l = v.charCodeAt(i + 1); - var c = (h - 0xD800) * 0x400 + l - 0xDC00 + 0x10000; - s += $encodeRune(c); - i += 2; - continue; - } - s += $encodeRune(h); - i++; - } - return s; - case $kindStruct: - var noJsObject = {}; - var searchJsObject = function(t) { - if (t === $jsObjectPtr) { - return v; - } - if (t === $jsObjectPtr.elem) { - $throwRuntimeError("cannot internalize js.Object, use *js.Object instead"); - } - switch (t.kind) { - case $kindPtr: - return searchJsObject(t.elem); - case $kindStruct: - var f = t.fields[0]; - var o = searchJsObject(f.typ); - if (o !== noJsObject) { - var n = new t.ptr(); - n[f.prop] = o; - return n; - } - return noJsObject; - default: - return noJsObject; - } - }; - var o = searchJsObject(t); - if (o !== noJsObject) { - return o; - } - } - $throwRuntimeError("cannot internalize " + t.string); -}; - -/* $isASCII reports whether string s contains only ASCII characters. */ -var $isASCII = function(s) { - for (var i = 0; i < s.length; i++) { - if (s.charCodeAt(i) >= 128) { - return false; - } - } - return true; -}; -` diff --git a/compiler/prelude/jsmapping.js b/compiler/prelude/jsmapping.js new file mode 100644 index 000000000..f5317d626 --- /dev/null +++ b/compiler/prelude/jsmapping.js @@ -0,0 +1,432 @@ +var $jsObjectPtr, $jsErrorPtr; + +var $needsExternalization = t => { + switch (t.kind) { + case $kindBool: + case $kindInt: + case $kindInt8: + case $kindInt16: + case $kindInt32: + case $kindUint: + case $kindUint8: + case $kindUint16: + case $kindUint32: + case $kindUintptr: + case $kindFloat32: + case $kindFloat64: + return false; + default: + return t !== $jsObjectPtr; + } +}; + +var $externalize = (v, t, makeWrapper) => { + if (t === $jsObjectPtr) { + return v; + } + switch (t.kind) { + case $kindBool: + case $kindInt: + case $kindInt8: + case $kindInt16: + case $kindInt32: + case $kindUint: + case $kindUint8: + case $kindUint16: + case $kindUint32: + case $kindUintptr: + case $kindFloat32: + case $kindFloat64: + return v; + case $kindInt64: + case $kindUint64: + return $flatten64(v); + case $kindArray: + if ($needsExternalization(t.elem)) { + return $mapArray(v, e => { return $externalize(e, t.elem, makeWrapper); }); + } + return v; + case $kindFunc: + return $externalizeFunction(v, t, false, makeWrapper); + case $kindInterface: + if (v === $ifaceNil) { + return null; + } + if (v.constructor === $jsObjectPtr) { + return v.$val.object; + } + return $externalize(v.$val, v.constructor, makeWrapper); + case $kindMap: + if (v.keys === undefined) { + return null; + } + var m = {}; + var keys = Array.from(v.keys()); + for (var i = 0; i < keys.length; i++) { + var entry = v.get(keys[i]); + m[$externalize(entry.k, t.key, makeWrapper)] = $externalize(entry.v, t.elem, makeWrapper); + } + return m; + case $kindPtr: + if (v === t.nil) { + return null; + } + return $externalize(v.$get(), t.elem, makeWrapper); + case $kindSlice: + if (v === v.constructor.nil) { + return null; + } + if ($needsExternalization(t.elem)) { + return $mapArray($sliceToNativeArray(v), e => { return $externalize(e, t.elem, makeWrapper); }); + } + return $sliceToNativeArray(v); + case $kindString: + if ($isASCII(v)) { + return v; + } + var s = "", r; + for (var i = 0; i < v.length; i += r[1]) { + r = $decodeRune(v, i); + var c = r[0]; + if (c > 0xFFFF) { + var h = Math.floor((c - 0x10000) / 0x400) + 0xD800; + var l = (c - 0x10000) % 0x400 + 0xDC00; + s += String.fromCharCode(h, l); + continue; + } + s += String.fromCharCode(c); + } + return s; + case $kindStruct: + var timePkg = $packages["time"]; + if (timePkg !== undefined && v.constructor === timePkg.Time.ptr) { + var milli = $div64(v.UnixNano(), new $Int64(0, 1000000)); + return new Date($flatten64(milli)); + } + + var noJsObject = {}; + var searchJsObject = (v, t) => { + if (t === $jsObjectPtr) { + return v; + } + switch (t.kind) { + case $kindPtr: + if (v === t.nil) { + return noJsObject; + } + return searchJsObject(v.$get(), t.elem); + case $kindStruct: + if (t.fields.length === 0) { + return noJsObject; + } + var f = t.fields[0]; + return searchJsObject(v[f.prop], f.typ); + case $kindInterface: + return searchJsObject(v.$val, v.constructor); + default: + return noJsObject; + } + }; + var o = searchJsObject(v, t); + if (o !== noJsObject) { + return o; + } + + if (makeWrapper !== undefined) { + return makeWrapper(v); + } + + o = {}; + for (var i = 0; i < t.fields.length; i++) { + var f = t.fields[i]; + if (!f.exported) { + continue; + } + o[f.name] = $externalize(v[f.prop], f.typ, makeWrapper); + } + return o; + } + $throwRuntimeError("cannot externalize " + t.string); +}; + +var $externalizeFunction = (v, t, passThis, makeWrapper) => { + if (v === $throwNilPointerError) { + return null; + } + if (v.$externalizeWrapper === undefined) { + $checkForDeadlock = false; + v.$externalizeWrapper = function () { + var args = []; + for (var i = 0; i < t.params.length; i++) { + if (t.variadic && i === t.params.length - 1) { + var vt = t.params[i].elem, varargs = []; + for (var j = i; j < arguments.length; j++) { + varargs.push($internalize(arguments[j], vt, makeWrapper)); + } + args.push(new (t.params[i])(varargs)); + break; + } + args.push($internalize(arguments[i], t.params[i], makeWrapper)); + } + var result = v.apply(passThis ? this : undefined, args); + switch (t.results.length) { + case 0: + return; + case 1: + return $externalize($copyIfRequired(result, t.results[0]), t.results[0], makeWrapper); + default: + for (var i = 0; i < t.results.length; i++) { + result[i] = $externalize($copyIfRequired(result[i], t.results[i]), t.results[i], makeWrapper); + } + return result; + } + }; + } + return v.$externalizeWrapper; +}; + +var $internalize = (v, t, recv, seen, makeWrapper) => { + if (t === $jsObjectPtr) { + return v; + } + if (t === $jsObjectPtr.elem) { + $throwRuntimeError("cannot internalize js.Object, use *js.Object instead"); + } + if (v && v.__internal_object__ !== undefined) { + return $assertType(v.__internal_object__, t, false); + } + var timePkg = $packages["time"]; + if (timePkg !== undefined && t === timePkg.Time) { + if (!(v !== null && v !== undefined && v.constructor === Date)) { + $throwRuntimeError("cannot internalize time.Time from " + typeof v + ", must be Date"); + } + return timePkg.Unix(new $Int64(0, 0), new $Int64(0, v.getTime() * 1000000)); + } + + // Cache for values we've already internalized in order to deal with circular + // references. + if (seen === undefined) { seen = new Map(); } + if (!seen.has(t)) { seen.set(t, new Map()); } + if (seen.get(t).has(v)) { return seen.get(t).get(v); } + + switch (t.kind) { + case $kindBool: + return !!v; + case $kindInt: + return parseInt(v); + case $kindInt8: + return parseInt(v) << 24 >> 24; + case $kindInt16: + return parseInt(v) << 16 >> 16; + case $kindInt32: + return parseInt(v) >> 0; + case $kindUint: + return parseInt(v); + case $kindUint8: + return parseInt(v) << 24 >>> 24; + case $kindUint16: + return parseInt(v) << 16 >>> 16; + case $kindUint32: + case $kindUintptr: + return parseInt(v) >>> 0; + case $kindInt64: + case $kindUint64: + return new t(0, v); + case $kindFloat32: + case $kindFloat64: + return parseFloat(v); + case $kindArray: + if (v === null || v === undefined) { + $throwRuntimeError("cannot internalize "+v+" as a "+t.string); + } + if (v.length !== t.len) { + $throwRuntimeError("got array with wrong size from JavaScript native"); + } + return $mapArray(v, e => { return $internalize(e, t.elem, makeWrapper); }); + case $kindFunc: + return function () { + var args = []; + for (var i = 0; i < t.params.length; i++) { + if (t.variadic && i === t.params.length - 1) { + var vt = t.params[i].elem, varargs = arguments[i]; + for (var j = 0; j < varargs.$length; j++) { + args.push($externalize(varargs.$array[varargs.$offset + j], vt, makeWrapper)); + } + break; + } + args.push($externalize(arguments[i], t.params[i], makeWrapper)); + } + var result = v.apply(recv, args); + switch (t.results.length) { + case 0: + return; + case 1: + return $internalize(result, t.results[0], makeWrapper); + default: + for (var i = 0; i < t.results.length; i++) { + result[i] = $internalize(result[i], t.results[i], makeWrapper); + } + return result; + } + }; + case $kindInterface: + if (t.methods.length !== 0) { + $throwRuntimeError("cannot internalize " + t.string); + } + if (v === null) { + return $ifaceNil; + } + if (v === undefined) { + return new $jsObjectPtr(undefined); + } + switch (v.constructor) { + case Int8Array: + return new ($sliceType($Int8))(v); + case Int16Array: + return new ($sliceType($Int16))(v); + case Int32Array: + return new ($sliceType($Int))(v); + case Uint8Array: + return new ($sliceType($Uint8))(v); + case Uint16Array: + return new ($sliceType($Uint16))(v); + case Uint32Array: + return new ($sliceType($Uint))(v); + case Float32Array: + return new ($sliceType($Float32))(v); + case Float64Array: + return new ($sliceType($Float64))(v); + case Array: + return $internalize(v, $sliceType($emptyInterface), makeWrapper); + case Boolean: + return new $Bool(!!v); + case Date: + if (timePkg === undefined) { + /* time package is not present, internalize as &js.Object{Date} so it can be externalized into original Date. */ + return new $jsObjectPtr(v); + } + return new timePkg.Time($internalize(v, timePkg.Time, makeWrapper)); + case ((() => { })).constructor: // is usually Function, but in Chrome extensions it is something else + var funcType = $funcType([$sliceType($emptyInterface)], [$jsObjectPtr], true); + return new funcType($internalize(v, funcType, makeWrapper)); + case Number: + return new $Float64(parseFloat(v)); + case String: + return new $String($internalize(v, $String, makeWrapper)); + default: + if ($global.Node && v instanceof $global.Node) { + return new $jsObjectPtr(v); + } + var mapType = $mapType($String, $emptyInterface); + return new mapType($internalize(v, mapType, recv, seen, makeWrapper)); + } + case $kindMap: + var m = new Map(); + seen.get(t).set(v, m); + var keys = $keys(v); + for (var i = 0; i < keys.length; i++) { + var k = $internalize(keys[i], t.key, recv, seen, makeWrapper); + m.set(t.key.keyFor(k), { k, v: $internalize(v[keys[i]], t.elem, recv, seen, makeWrapper) }); + } + return m; + case $kindPtr: + if (t.elem.kind === $kindStruct) { + return $internalize(v, t.elem, makeWrapper); + } + case $kindSlice: + if (v == null) { + return t.zero(); + } + return new t($mapArray(v, e => { return $internalize(e, t.elem, makeWrapper); })); + case $kindString: + v = String(v); + if ($isASCII(v)) { + return v; + } + var s = ""; + var i = 0; + while (i < v.length) { + var h = v.charCodeAt(i); + if (0xD800 <= h && h <= 0xDBFF) { + var l = v.charCodeAt(i + 1); + var c = (h - 0xD800) * 0x400 + l - 0xDC00 + 0x10000; + s += $encodeRune(c); + i += 2; + continue; + } + s += $encodeRune(h); + i++; + } + return s; + case $kindStruct: + var noJsObject = {}; + var searchJsObject = t => { + if (t === $jsObjectPtr) { + return v; + } + if (t === $jsObjectPtr.elem) { + $throwRuntimeError("cannot internalize js.Object, use *js.Object instead"); + } + switch (t.kind) { + case $kindPtr: + return searchJsObject(t.elem); + case $kindStruct: + if (t.fields.length === 0) { + return noJsObject; + } + var f = t.fields[0]; + var o = searchJsObject(f.typ); + if (o !== noJsObject) { + var n = new t.ptr(); + n[f.prop] = o; + return n; + } + return noJsObject; + default: + return noJsObject; + } + }; + var o = searchJsObject(t); + if (o !== noJsObject) { + return o; + } + var n = new t.ptr(); + for (var i = 0; i < t.fields.length; i++) { + var f = t.fields[i]; + + if (!f.exported) { + continue; + } + var jsProp = v[f.name]; + + n[f.prop] = $internalize(jsProp, f.typ, recv, seen, makeWrapper); + } + + return n; + } + $throwRuntimeError("cannot internalize " + t.string); +}; + +var $copyIfRequired = (v, typ) => { + // interface values + if (v && v.constructor && v.constructor.copy) { + return new v.constructor($clone(v.$val, v.constructor)) + } + // array and struct values + if (typ.copy) { + var clone = typ.zero(); + typ.copy(clone, v); + return clone; + } + return v; +} + +/* $isASCII reports whether string s contains only ASCII characters. */ +var $isASCII = s => { + for (var i = 0; i < s.length; i++) { + if (s.charCodeAt(i) >= 128) { + return false; + } + } + return true; +}; diff --git a/compiler/prelude/numeric.go b/compiler/prelude/numeric.go deleted file mode 100644 index 063d09f46..000000000 --- a/compiler/prelude/numeric.go +++ /dev/null @@ -1,196 +0,0 @@ -package prelude - -const numeric = ` -var $min = Math.min; -var $mod = function(x, y) { return x % y; }; -var $parseInt = parseInt; -var $parseFloat = function(f) { - if (f !== undefined && f !== null && f.constructor === Number) { - return f; - } - return parseFloat(f); -}; - -var $froundBuf = new Float32Array(1); -var $fround = Math.fround || function(f) { - $froundBuf[0] = f; - return $froundBuf[0]; -}; - -var $imul = Math.imul || function(a, b) { - var ah = (a >>> 16) & 0xffff; - var al = a & 0xffff; - var bh = (b >>> 16) & 0xffff; - var bl = b & 0xffff; - return ((al * bl) + (((ah * bl + al * bh) << 16) >>> 0) >> 0); -}; - -var $floatKey = function(f) { - if (f !== f) { - $idCounter++; - return "NaN$" + $idCounter; - } - return String(f); -}; - -var $flatten64 = function(x) { - return x.$high * 4294967296 + x.$low; -}; - -var $shiftLeft64 = function(x, y) { - if (y === 0) { - return x; - } - if (y < 32) { - return new x.constructor(x.$high << y | x.$low >>> (32 - y), (x.$low << y) >>> 0); - } - if (y < 64) { - return new x.constructor(x.$low << (y - 32), 0); - } - return new x.constructor(0, 0); -}; - -var $shiftRightInt64 = function(x, y) { - if (y === 0) { - return x; - } - if (y < 32) { - return new x.constructor(x.$high >> y, (x.$low >>> y | x.$high << (32 - y)) >>> 0); - } - if (y < 64) { - return new x.constructor(x.$high >> 31, (x.$high >> (y - 32)) >>> 0); - } - if (x.$high < 0) { - return new x.constructor(-1, 4294967295); - } - return new x.constructor(0, 0); -}; - -var $shiftRightUint64 = function(x, y) { - if (y === 0) { - return x; - } - if (y < 32) { - return new x.constructor(x.$high >>> y, (x.$low >>> y | x.$high << (32 - y)) >>> 0); - } - if (y < 64) { - return new x.constructor(0, x.$high >>> (y - 32)); - } - return new x.constructor(0, 0); -}; - -var $mul64 = function(x, y) { - var high = 0, low = 0; - if ((y.$low & 1) !== 0) { - high = x.$high; - low = x.$low; - } - for (var i = 1; i < 32; i++) { - if ((y.$low & 1<>> (32 - i); - low += (x.$low << i) >>> 0; - } - } - for (var i = 0; i < 32; i++) { - if ((y.$high & 1< yHigh) || (xHigh === yHigh && xLow > yLow))) { - yHigh = (yHigh << 1 | yLow >>> 31) >>> 0; - yLow = (yLow << 1) >>> 0; - n++; - } - for (var i = 0; i <= n; i++) { - high = high << 1 | low >>> 31; - low = (low << 1) >>> 0; - if ((xHigh > yHigh) || (xHigh === yHigh && xLow >= yLow)) { - xHigh = xHigh - yHigh; - xLow = xLow - yLow; - if (xLow < 0) { - xHigh--; - xLow += 4294967296; - } - low++; - if (low === 4294967296) { - high++; - low = 0; - } - } - yLow = (yLow >>> 1 | yHigh << (32 - 1)) >>> 0; - yHigh = yHigh >>> 1; - } - - if (returnRemainder) { - return new x.constructor(xHigh * rs, xLow * rs); - } - return new x.constructor(high * s, low * s); -}; - -var $divComplex = function(n, d) { - var ninf = n.$real === Infinity || n.$real === -Infinity || n.$imag === Infinity || n.$imag === -Infinity; - var dinf = d.$real === Infinity || d.$real === -Infinity || d.$imag === Infinity || d.$imag === -Infinity; - var nnan = !ninf && (n.$real !== n.$real || n.$imag !== n.$imag); - var dnan = !dinf && (d.$real !== d.$real || d.$imag !== d.$imag); - if(nnan || dnan) { - return new n.constructor(NaN, NaN); - } - if (ninf && !dinf) { - return new n.constructor(Infinity, Infinity); - } - if (!ninf && dinf) { - return new n.constructor(0, 0); - } - if (d.$real === 0 && d.$imag === 0) { - if (n.$real === 0 && n.$imag === 0) { - return new n.constructor(NaN, NaN); - } - return new n.constructor(Infinity, Infinity); - } - var a = Math.abs(d.$real); - var b = Math.abs(d.$imag); - if (a <= b) { - var ratio = d.$real / d.$imag; - var denom = d.$real * ratio + d.$imag; - return new n.constructor((n.$real * ratio + n.$imag) / denom, (n.$imag * ratio - n.$real) / denom); - } - var ratio = d.$imag / d.$real; - var denom = d.$imag * ratio + d.$real; - return new n.constructor((n.$imag * ratio + n.$real) / denom, (n.$imag - n.$real * ratio) / denom); -}; -` diff --git a/compiler/prelude/numeric.js b/compiler/prelude/numeric.js new file mode 100644 index 000000000..5cfd7644d --- /dev/null +++ b/compiler/prelude/numeric.js @@ -0,0 +1,212 @@ +var $min = Math.min; +var $mod = (x, y) => { return x % y; }; +var $parseInt = parseInt; +var $parseFloat = f => { + if (f !== undefined && f !== null && f.constructor === Number) { + return f; + } + return parseFloat(f); +}; + +var $froundBuf = new Float32Array(1); +var $fround = Math.fround || (f => { + $froundBuf[0] = f; + return $froundBuf[0]; +}); + +var $imul = Math.imul || ((a, b) => { + var ah = (a >>> 16) & 0xffff; + var al = a & 0xffff; + var bh = (b >>> 16) & 0xffff; + var bl = b & 0xffff; + return ((al * bl) + (((ah * bl + al * bh) << 16) >>> 0) >> 0); +}); + +var $floatKey = f => { + if (f !== f) { + $idCounter++; + return "NaN$" + $idCounter; + } + return String(f); +}; + +var $flatten64 = x => { + return x.$high * 4294967296 + x.$low; +}; + +var $shiftLeft64 = (x, y) => { + if (y === 0) { + return x; + } + if (y < 32) { + return new x.constructor(x.$high << y | x.$low >>> (32 - y), (x.$low << y) >>> 0); + } + if (y < 64) { + return new x.constructor(x.$low << (y - 32), 0); + } + return new x.constructor(0, 0); +}; + +var $shiftRightInt64 = (x, y) => { + if (y === 0) { + return x; + } + if (y < 32) { + return new x.constructor(x.$high >> y, (x.$low >>> y | x.$high << (32 - y)) >>> 0); + } + if (y < 64) { + return new x.constructor(x.$high >> 31, (x.$high >> (y - 32)) >>> 0); + } + if (x.$high < 0) { + return new x.constructor(-1, 4294967295); + } + return new x.constructor(0, 0); +}; + +var $shiftRightUint64 = (x, y) => { + if (y === 0) { + return x; + } + if (y < 32) { + return new x.constructor(x.$high >>> y, (x.$low >>> y | x.$high << (32 - y)) >>> 0); + } + if (y < 64) { + return new x.constructor(0, x.$high >>> (y - 32)); + } + return new x.constructor(0, 0); +}; + +var $mul64 = (x, y) => { + var x48 = x.$high >>> 16; + var x32 = x.$high & 0xFFFF; + var x16 = x.$low >>> 16; + var x00 = x.$low & 0xFFFF; + + var y48 = y.$high >>> 16; + var y32 = y.$high & 0xFFFF; + var y16 = y.$low >>> 16; + var y00 = y.$low & 0xFFFF; + + var z48 = 0, z32 = 0, z16 = 0, z00 = 0; + z00 += x00 * y00; + z16 += z00 >>> 16; + z00 &= 0xFFFF; + z16 += x16 * y00; + z32 += z16 >>> 16; + z16 &= 0xFFFF; + z16 += x00 * y16; + z32 += z16 >>> 16; + z16 &= 0xFFFF; + z32 += x32 * y00; + z48 += z32 >>> 16; + z32 &= 0xFFFF; + z32 += x16 * y16; + z48 += z32 >>> 16; + z32 &= 0xFFFF; + z32 += x00 * y32; + z48 += z32 >>> 16; + z32 &= 0xFFFF; + z48 += x48 * y00 + x32 * y16 + x16 * y32 + x00 * y48; + z48 &= 0xFFFF; + + var hi = ((z48 << 16) | z32) >>> 0; + var lo = ((z16 << 16) | z00) >>> 0; + + var r = new x.constructor(hi, lo); + return r; +}; + +var $div64 = (x, y, returnRemainder) => { + if (y.$high === 0 && y.$low === 0) { + $throwRuntimeError("integer divide by zero"); + } + + var s = 1; + var rs = 1; + + var xHigh = x.$high; + var xLow = x.$low; + if (xHigh < 0) { + s = -1; + rs = -1; + xHigh = -xHigh; + if (xLow !== 0) { + xHigh--; + xLow = 4294967296 - xLow; + } + } + + var yHigh = y.$high; + var yLow = y.$low; + if (y.$high < 0) { + s *= -1; + yHigh = -yHigh; + if (yLow !== 0) { + yHigh--; + yLow = 4294967296 - yLow; + } + } + + var high = 0, low = 0, n = 0; + while (yHigh < 2147483648 && ((xHigh > yHigh) || (xHigh === yHigh && xLow > yLow))) { + yHigh = (yHigh << 1 | yLow >>> 31) >>> 0; + yLow = (yLow << 1) >>> 0; + n++; + } + for (var i = 0; i <= n; i++) { + high = high << 1 | low >>> 31; + low = (low << 1) >>> 0; + if ((xHigh > yHigh) || (xHigh === yHigh && xLow >= yLow)) { + xHigh = xHigh - yHigh; + xLow = xLow - yLow; + if (xLow < 0) { + xHigh--; + xLow += 4294967296; + } + low++; + if (low === 4294967296) { + high++; + low = 0; + } + } + yLow = (yLow >>> 1 | yHigh << (32 - 1)) >>> 0; + yHigh = yHigh >>> 1; + } + + if (returnRemainder) { + return new x.constructor(xHigh * rs, xLow * rs); + } + return new x.constructor(high * s, low * s); +}; + +var $divComplex = (n, d) => { + var ninf = n.$real === Infinity || n.$real === -Infinity || n.$imag === Infinity || n.$imag === -Infinity; + var dinf = d.$real === Infinity || d.$real === -Infinity || d.$imag === Infinity || d.$imag === -Infinity; + var nnan = !ninf && (n.$real !== n.$real || n.$imag !== n.$imag); + var dnan = !dinf && (d.$real !== d.$real || d.$imag !== d.$imag); + if (nnan || dnan) { + return new n.constructor(NaN, NaN); + } + if (ninf && !dinf) { + return new n.constructor(Infinity, Infinity); + } + if (!ninf && dinf) { + return new n.constructor(0, 0); + } + if (d.$real === 0 && d.$imag === 0) { + if (n.$real === 0 && n.$imag === 0) { + return new n.constructor(NaN, NaN); + } + return new n.constructor(Infinity, Infinity); + } + var a = Math.abs(d.$real); + var b = Math.abs(d.$imag); + if (a <= b) { + var ratio = d.$real / d.$imag; + var denom = d.$real * ratio + d.$imag; + return new n.constructor((n.$real * ratio + n.$imag) / denom, (n.$imag * ratio - n.$real) / denom); + } + var ratio = d.$imag / d.$real; + var denom = d.$imag * ratio + d.$real; + return new n.constructor((n.$imag * ratio + n.$real) / denom, (n.$imag - n.$real * ratio) / denom); +}; diff --git a/compiler/prelude/prelude.go b/compiler/prelude/prelude.go index c27601e88..0b605b697 100644 --- a/compiler/prelude/prelude.go +++ b/compiler/prelude/prelude.go @@ -1,425 +1,48 @@ package prelude -//go:generate go run genmin.go +import ( + _ "embed" -// Prelude is the GopherJS JavaScript interop layer. -const Prelude = prelude + numeric + types + goroutines + jsmapping - -const prelude = `Error.stackTraceLimit = Infinity; - -var $global, $module; -if (typeof window !== "undefined") { /* web page */ - $global = window; -} else if (typeof self !== "undefined") { /* web worker */ - $global = self; -} else if (typeof global !== "undefined") { /* Node.js */ - $global = global; - $global.require = require; -} else { /* others (e.g. Nashorn) */ - $global = this; -} + "github.com/evanw/esbuild/pkg/api" + log "github.com/sirupsen/logrus" +) -if ($global === undefined || $global.Array === undefined) { - throw new Error("no global object found"); -} -if (typeof module !== "undefined") { - $module = module; +// Prelude is the GopherJS JavaScript interop layer. +var Prelude = prelude + numeric + types + goroutines + jsmapping + +//go:embed prelude.js +var prelude string + +//go:embed types.js +var types string + +//go:embed numeric.js +var numeric string + +//go:embed jsmapping.js +var jsmapping string + +//go:embed goroutines.js +var goroutines string + +func Minified() string { + result := api.Transform(Prelude, api.TransformOptions{ + Target: api.ES2015, + MinifyWhitespace: true, + MinifyIdentifiers: true, + MinifySyntax: true, + KeepNames: true, + Charset: api.CharsetUTF8, + LegalComments: api.LegalCommentsEndOfFile, + }) + for _, w := range result.Warnings { + log.Warnf("%d:%d: %s\n%s\n", w.Location.Line, w.Location.Column, w.Text, w.Location.LineText) + } + if errCount := len(result.Errors); errCount > 0 { + for _, e := range result.Errors { + log.Errorf("%d:%d: %s\n%s\n", e.Location.Line, e.Location.Column, e.Text, e.Location.LineText) + } + log.Fatalf("Prelude minification failed with %d errors", errCount) + } + return string(result.Code) } - -var $packages = {}, $idCounter = 0; -var $keys = function(m) { return m ? Object.keys(m) : []; }; -var $flushConsole = function() {}; -var $throwRuntimeError; /* set by package "runtime" */ -var $throwNilPointerError = function() { $throwRuntimeError("invalid memory address or nil pointer dereference"); }; -var $call = function(fn, rcvr, args) { return fn.apply(rcvr, args); }; -var $makeFunc = function(fn) { return function() { return $externalize(fn(this, new ($sliceType($jsObjectPtr))($global.Array.prototype.slice.call(arguments, []))), $emptyInterface); }; }; -var $unused = function(v) {}; - -var $mapArray = function(array, f) { - var newArray = new array.constructor(array.length); - for (var i = 0; i < array.length; i++) { - newArray[i] = f(array[i]); - } - return newArray; -}; - -var $methodVal = function(recv, name) { - var vals = recv.$methodVals || {}; - recv.$methodVals = vals; /* noop for primitives */ - var f = vals[name]; - if (f !== undefined) { - return f; - } - var method = recv[name]; - f = function() { - $stackDepthOffset--; - try { - return method.apply(recv, arguments); - } finally { - $stackDepthOffset++; - } - }; - vals[name] = f; - return f; -}; - -var $methodExpr = function(typ, name) { - var method = typ.prototype[name]; - if (method.$expr === undefined) { - method.$expr = function() { - $stackDepthOffset--; - try { - if (typ.wrapped) { - arguments[0] = new typ(arguments[0]); - } - return Function.call.apply(method, arguments); - } finally { - $stackDepthOffset++; - } - }; - } - return method.$expr; -}; - -var $ifaceMethodExprs = {}; -var $ifaceMethodExpr = function(name) { - var expr = $ifaceMethodExprs["$" + name]; - if (expr === undefined) { - expr = $ifaceMethodExprs["$" + name] = function() { - $stackDepthOffset--; - try { - return Function.call.apply(arguments[0][name], arguments); - } finally { - $stackDepthOffset++; - } - }; - } - return expr; -}; - -var $subslice = function(slice, low, high, max) { - if (high === undefined) { - high = slice.$length; - } - if (max === undefined) { - max = slice.$capacity; - } - if (low < 0 || high < low || max < high || high > slice.$capacity || max > slice.$capacity) { - $throwRuntimeError("slice bounds out of range"); - } - if (slice === slice.constructor.nil) { - return slice; - } - var s = new slice.constructor(slice.$array); - s.$offset = slice.$offset + low; - s.$length = high - low; - s.$capacity = max - low; - return s; -}; - -var $substring = function(str, low, high) { - if (low < 0 || high < low || high > str.length) { - $throwRuntimeError("slice bounds out of range"); - } - return str.substring(low, high); -}; - -var $sliceToArray = function(slice) { - if (slice.$array.constructor !== Array) { - return slice.$array.subarray(slice.$offset, slice.$offset + slice.$length); - } - return slice.$array.slice(slice.$offset, slice.$offset + slice.$length); -}; - -var $decodeRune = function(str, pos) { - var c0 = str.charCodeAt(pos); - - if (c0 < 0x80) { - return [c0, 1]; - } - - if (c0 !== c0 || c0 < 0xC0) { - return [0xFFFD, 1]; - } - - var c1 = str.charCodeAt(pos + 1); - if (c1 !== c1 || c1 < 0x80 || 0xC0 <= c1) { - return [0xFFFD, 1]; - } - - if (c0 < 0xE0) { - var r = (c0 & 0x1F) << 6 | (c1 & 0x3F); - if (r <= 0x7F) { - return [0xFFFD, 1]; - } - return [r, 2]; - } - - var c2 = str.charCodeAt(pos + 2); - if (c2 !== c2 || c2 < 0x80 || 0xC0 <= c2) { - return [0xFFFD, 1]; - } - - if (c0 < 0xF0) { - var r = (c0 & 0x0F) << 12 | (c1 & 0x3F) << 6 | (c2 & 0x3F); - if (r <= 0x7FF) { - return [0xFFFD, 1]; - } - if (0xD800 <= r && r <= 0xDFFF) { - return [0xFFFD, 1]; - } - return [r, 3]; - } - - var c3 = str.charCodeAt(pos + 3); - if (c3 !== c3 || c3 < 0x80 || 0xC0 <= c3) { - return [0xFFFD, 1]; - } - - if (c0 < 0xF8) { - var r = (c0 & 0x07) << 18 | (c1 & 0x3F) << 12 | (c2 & 0x3F) << 6 | (c3 & 0x3F); - if (r <= 0xFFFF || 0x10FFFF < r) { - return [0xFFFD, 1]; - } - return [r, 4]; - } - - return [0xFFFD, 1]; -}; - -var $encodeRune = function(r) { - if (r < 0 || r > 0x10FFFF || (0xD800 <= r && r <= 0xDFFF)) { - r = 0xFFFD; - } - if (r <= 0x7F) { - return String.fromCharCode(r); - } - if (r <= 0x7FF) { - return String.fromCharCode(0xC0 | r >> 6, 0x80 | (r & 0x3F)); - } - if (r <= 0xFFFF) { - return String.fromCharCode(0xE0 | r >> 12, 0x80 | (r >> 6 & 0x3F), 0x80 | (r & 0x3F)); - } - return String.fromCharCode(0xF0 | r >> 18, 0x80 | (r >> 12 & 0x3F), 0x80 | (r >> 6 & 0x3F), 0x80 | (r & 0x3F)); -}; - -var $stringToBytes = function(str) { - var array = new Uint8Array(str.length); - for (var i = 0; i < str.length; i++) { - array[i] = str.charCodeAt(i); - } - return array; -}; - -var $bytesToString = function(slice) { - if (slice.$length === 0) { - return ""; - } - var str = ""; - for (var i = 0; i < slice.$length; i += 10000) { - str += String.fromCharCode.apply(undefined, slice.$array.subarray(slice.$offset + i, slice.$offset + Math.min(slice.$length, i + 10000))); - } - return str; -}; - -var $stringToRunes = function(str) { - var array = new Int32Array(str.length); - var rune, j = 0; - for (var i = 0; i < str.length; i += rune[1], j++) { - rune = $decodeRune(str, i); - array[j] = rune[0]; - } - return array.subarray(0, j); -}; - -var $runesToString = function(slice) { - if (slice.$length === 0) { - return ""; - } - var str = ""; - for (var i = 0; i < slice.$length; i++) { - str += $encodeRune(slice.$array[slice.$offset + i]); - } - return str; -}; - -var $copyString = function(dst, src) { - var n = Math.min(src.length, dst.$length); - for (var i = 0; i < n; i++) { - dst.$array[dst.$offset + i] = src.charCodeAt(i); - } - return n; -}; - -var $copySlice = function(dst, src) { - var n = Math.min(src.$length, dst.$length); - $copyArray(dst.$array, src.$array, dst.$offset, src.$offset, n, dst.constructor.elem); - return n; -}; - -var $copyArray = function(dst, src, dstOffset, srcOffset, n, elem) { - if (n === 0 || (dst === src && dstOffset === srcOffset)) { - return; - } - - if (src.subarray) { - dst.set(src.subarray(srcOffset, srcOffset + n), dstOffset); - return; - } - - switch (elem.kind) { - case $kindArray: - case $kindStruct: - if (dst === src && dstOffset > srcOffset) { - for (var i = n - 1; i >= 0; i--) { - elem.copy(dst[dstOffset + i], src[srcOffset + i]); - } - return; - } - for (var i = 0; i < n; i++) { - elem.copy(dst[dstOffset + i], src[srcOffset + i]); - } - return; - } - - if (dst === src && dstOffset > srcOffset) { - for (var i = n - 1; i >= 0; i--) { - dst[dstOffset + i] = src[srcOffset + i]; - } - return; - } - for (var i = 0; i < n; i++) { - dst[dstOffset + i] = src[srcOffset + i]; - } -}; - -var $clone = function(src, type) { - var clone = type.zero(); - type.copy(clone, src); - return clone; -}; - -var $pointerOfStructConversion = function(obj, type) { - if(obj.$proxies === undefined) { - obj.$proxies = {}; - obj.$proxies[obj.constructor.string] = obj; - } - var proxy = obj.$proxies[type.string]; - if (proxy === undefined) { - var properties = {}; - for (var i = 0; i < type.elem.fields.length; i++) { - (function(fieldProp) { - properties[fieldProp] = { - get: function() { return obj[fieldProp]; }, - set: function(value) { obj[fieldProp] = value; } - }; - })(type.elem.fields[i].prop); - } - proxy = Object.create(type.prototype, properties); - proxy.$val = proxy; - obj.$proxies[type.string] = proxy; - proxy.$proxies = obj.$proxies; - } - return proxy; -}; - -var $append = function(slice) { - return $internalAppend(slice, arguments, 1, arguments.length - 1); -}; - -var $appendSlice = function(slice, toAppend) { - if (toAppend.constructor === String) { - var bytes = $stringToBytes(toAppend); - return $internalAppend(slice, bytes, 0, bytes.length); - } - return $internalAppend(slice, toAppend.$array, toAppend.$offset, toAppend.$length); -}; - -var $internalAppend = function(slice, array, offset, length) { - if (length === 0) { - return slice; - } - - var newArray = slice.$array; - var newOffset = slice.$offset; - var newLength = slice.$length + length; - var newCapacity = slice.$capacity; - - if (newLength > newCapacity) { - newOffset = 0; - newCapacity = Math.max(newLength, slice.$capacity < 1024 ? slice.$capacity * 2 : Math.floor(slice.$capacity * 5 / 4)); - - if (slice.$array.constructor === Array) { - newArray = slice.$array.slice(slice.$offset, slice.$offset + slice.$length); - newArray.length = newCapacity; - var zero = slice.constructor.elem.zero; - for (var i = slice.$length; i < newCapacity; i++) { - newArray[i] = zero(); - } - } else { - newArray = new slice.$array.constructor(newCapacity); - newArray.set(slice.$array.subarray(slice.$offset, slice.$offset + slice.$length)); - } - } - - $copyArray(newArray, array, newOffset + slice.$length, offset, length, slice.constructor.elem); - - var newSlice = new slice.constructor(newArray); - newSlice.$offset = newOffset; - newSlice.$length = newLength; - newSlice.$capacity = newCapacity; - return newSlice; -}; - -var $equal = function(a, b, type) { - if (type === $jsObjectPtr) { - return a === b; - } - switch (type.kind) { - case $kindComplex64: - case $kindComplex128: - return a.$real === b.$real && a.$imag === b.$imag; - case $kindInt64: - case $kindUint64: - return a.$high === b.$high && a.$low === b.$low; - case $kindArray: - if (a.length !== b.length) { - return false; - } - for (var i = 0; i < a.length; i++) { - if (!$equal(a[i], b[i], type.elem)) { - return false; - } - } - return true; - case $kindStruct: - for (var i = 0; i < type.fields.length; i++) { - var f = type.fields[i]; - if (!$equal(a[f.prop], b[f.prop], f.typ)) { - return false; - } - } - return true; - case $kindInterface: - return $interfaceIsEqual(a, b); - default: - return a === b; - } -}; - -var $interfaceIsEqual = function(a, b) { - if (a === $ifaceNil || b === $ifaceNil) { - return a === b; - } - if (a.constructor !== b.constructor) { - return false; - } - if (a.constructor === $jsObjectPtr) { - return a.object === b.object; - } - if (!a.constructor.comparable) { - $throwRuntimeError("comparing uncomparable type " + a.constructor.string); - } - return $equal(a.$val, b.$val, a.constructor); -}; -` diff --git a/compiler/prelude/prelude.js b/compiler/prelude/prelude.js new file mode 100644 index 000000000..d35de6b01 --- /dev/null +++ b/compiler/prelude/prelude.js @@ -0,0 +1,571 @@ +Error.stackTraceLimit = Infinity; + +var $NaN = NaN; +var $global, $module; +if (typeof window !== "undefined") { /* web page */ + $global = window; +} else if (typeof self !== "undefined") { /* web worker */ + $global = self; +} else if (typeof global !== "undefined") { /* Node.js */ + $global = global; + $global.require = require; +} else { /* others (e.g. Nashorn) */ + $global = this; +} + +if ($global === undefined || $global.Array === undefined) { + throw new Error("no global object found"); +} +if (typeof module !== "undefined") { + $module = module; +} + +if (!$global.fs && $global.require) { + try { + var fs = $global.require('fs'); + if (typeof fs === "object" && fs !== null && Object.keys(fs).length !== 0) { + $global.fs = fs; + } + } catch (e) { /* Ignore if the module couldn't be loaded. */ } +} + +if (!$global.fs) { + var outputBuf = ""; + var decoder = new TextDecoder("utf-8"); + $global.fs = { + constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused + writeSync: function writeSync(fd, buf) { + outputBuf += decoder.decode(buf); + var nl = outputBuf.lastIndexOf("\n"); + if (nl != -1) { + console.log(outputBuf.substr(0, nl)); + outputBuf = outputBuf.substr(nl + 1); + } + return buf.length; + }, + write: function write(fd, buf, offset, length, position, callback) { + if (offset !== 0 || length !== buf.length || position !== null) { + callback(enosys()); + return; + } + var n = this.writeSync(fd, buf); + callback(null, n); + } + }; +} + +var $linknames = {} // Collection of functions referenced by a go:linkname directive. +var $packages = {}, $idCounter = 0; +var $keys = m => { return m ? Object.keys(m) : []; }; +var $flushConsole = () => { }; +var $throwRuntimeError; /* set by package "runtime" */ +var $throwNilPointerError = () => { $throwRuntimeError("invalid memory address or nil pointer dereference"); }; +var $call = (fn, rcvr, args) => { return fn.apply(rcvr, args); }; +var $makeFunc = fn => { return function(...args) { return $externalize(fn(this, new ($sliceType($jsObjectPtr))($global.Array.prototype.slice.call(args, []))), $emptyInterface); }; }; +var $unused = v => { }; +var $print = console.log; +// Under Node we can emulate print() more closely by avoiding a newline. +if (($global.process !== undefined) && $global.require) { + try { + var util = $global.require('util'); + $print = function(...args) { $global.process.stderr.write(util.format.apply(this, args)); }; + } catch (e) { + // Failed to require util module, keep using console.log(). + } +} +var $println = console.log + +var $initAllLinknames = () => { + var names = $keys($packages); + for (var i = 0; i < names.length; i++) { + var f = $packages[names[i]]["$initLinknames"]; + if (typeof f == 'function') { + f(); + } + } +} + +var $mapArray = (array, f) => { + var newArray = new array.constructor(array.length); + for (var i = 0; i < array.length; i++) { + newArray[i] = f(array[i]); + } + return newArray; +}; + +// $mapIndex returns the value of the given key in m, or undefined if m is nil/undefined or not a map +var $mapIndex = (m, key) => { + return typeof m.get === "function" ? m.get(key) : undefined; +}; +// $mapDelete deletes the key and associated value from m. If m is nil/undefined or not a map, $mapDelete is a no-op +var $mapDelete = (m, key) => { + typeof m.delete === "function" && m.delete(key) +}; +// Returns a method bound to the receiver instance, safe to invoke as a +// standalone function. Bound function is cached for later reuse. +var $methodVal = (recv, name) => { + var vals = recv.$methodVals || {}; + recv.$methodVals = vals; /* noop for primitives */ + var f = vals[name]; + if (f !== undefined) { + return f; + } + var method = recv[name]; + f = method.bind(recv); + vals[name] = f; + return f; +}; + +var $methodExpr = (typ, name) => { + var method = typ.prototype[name]; + if (method.$expr === undefined) { + method.$expr = (...args) => { + $stackDepthOffset--; + try { + if (typ.wrapped) { + args[0] = new typ(args[0]); + } + return Function.call.apply(method, args); + } finally { + $stackDepthOffset++; + } + }; + } + return method.$expr; +}; + +var $ifaceMethodExprs = {}; +var $ifaceMethodExpr = name => { + var expr = $ifaceMethodExprs["$" + name]; + if (expr === undefined) { + expr = $ifaceMethodExprs["$" + name] = (...args) => { + $stackDepthOffset--; + try { + return Function.call.apply(args[0][name], args); + } finally { + $stackDepthOffset++; + } + }; + } + return expr; +}; + +var $subslice = (slice, low, high, max) => { + if (high === undefined) { + high = slice.$length; + } + if (max === undefined) { + max = slice.$capacity; + } + if (low < 0 || high < low || max < high || high > slice.$capacity || max > slice.$capacity) { + $throwRuntimeError("slice bounds out of range"); + } + if (slice === slice.constructor.nil) { + return slice; + } + var s = new slice.constructor(slice.$array); + s.$offset = slice.$offset + low; + s.$length = high - low; + s.$capacity = max - low; + return s; +}; + +var $substring = (str, low, high) => { + if (low < 0 || high < low || high > str.length) { + $throwRuntimeError("slice bounds out of range"); + } + return str.substring(low, high); +}; + +// Convert Go slice to an equivalent JS array type. +var $sliceToNativeArray = slice => { + if (slice.$array.constructor !== Array) { + return slice.$array.subarray(slice.$offset, slice.$offset + slice.$length); + } + return slice.$array.slice(slice.$offset, slice.$offset + slice.$length); +}; + +// Convert Go slice to a pointer to an underlying Go array. +// +// Note that an array pointer can be represented by an "unwrapped" native array +// type, and it will be wrapped back into its Go type when necessary. +var $sliceToGoArray = (slice, arrayPtrType) => { + var arrayType = arrayPtrType.elem; + if (arrayType !== undefined && slice.$length < arrayType.len) { + $throwRuntimeError("cannot convert slice with length " + slice.$length + " to pointer to array with length " + arrayType.len); + } + if (slice == slice.constructor.nil) { + return arrayPtrType.nil; // Nil slice converts to nil array pointer. + } + if (slice.$array.constructor !== Array) { + return slice.$array.subarray(slice.$offset, slice.$offset + arrayType.len); + } + if (slice.$offset == 0 && slice.$length == slice.$capacity && slice.$length == arrayType.len) { + return slice.$array; + } + if (arrayType.len == 0) { + return new arrayType([]); + } + + // Array.slice (unlike TypedArray.subarray) returns a copy of an array range, + // which is not sharing memory with the original one, which violates the spec + // for slice to array conversion. This is incompatible with the Go spec, in + // particular that the assignments to the array elements would be visible in + // the slice. Prefer to fail explicitly instead of creating subtle bugs. + $throwRuntimeError("gopherjs: non-numeric slice to underlying array conversion is not supported for subslices"); +}; + +// Convert between compatible slice types (e.g. native and names). +var $convertSliceType = (slice, desiredType) => { + if (slice == slice.constructor.nil) { + return desiredType.nil; // Preserve nil value. + } + + return $subslice(new desiredType(slice.$array), slice.$offset, slice.$offset + slice.$length); +} + +var $decodeRune = (str, pos) => { + var c0 = str.charCodeAt(pos); + + if (c0 < 0x80) { + return [c0, 1]; + } + + if (c0 !== c0 || c0 < 0xC0) { + return [0xFFFD, 1]; + } + + var c1 = str.charCodeAt(pos + 1); + if (c1 !== c1 || c1 < 0x80 || 0xC0 <= c1) { + return [0xFFFD, 1]; + } + + if (c0 < 0xE0) { + var r = (c0 & 0x1F) << 6 | (c1 & 0x3F); + if (r <= 0x7F) { + return [0xFFFD, 1]; + } + return [r, 2]; + } + + var c2 = str.charCodeAt(pos + 2); + if (c2 !== c2 || c2 < 0x80 || 0xC0 <= c2) { + return [0xFFFD, 1]; + } + + if (c0 < 0xF0) { + var r = (c0 & 0x0F) << 12 | (c1 & 0x3F) << 6 | (c2 & 0x3F); + if (r <= 0x7FF) { + return [0xFFFD, 1]; + } + if (0xD800 <= r && r <= 0xDFFF) { + return [0xFFFD, 1]; + } + return [r, 3]; + } + + var c3 = str.charCodeAt(pos + 3); + if (c3 !== c3 || c3 < 0x80 || 0xC0 <= c3) { + return [0xFFFD, 1]; + } + + if (c0 < 0xF8) { + var r = (c0 & 0x07) << 18 | (c1 & 0x3F) << 12 | (c2 & 0x3F) << 6 | (c3 & 0x3F); + if (r <= 0xFFFF || 0x10FFFF < r) { + return [0xFFFD, 1]; + } + return [r, 4]; + } + + return [0xFFFD, 1]; +}; + +var $encodeRune = r => { + if (r < 0 || r > 0x10FFFF || (0xD800 <= r && r <= 0xDFFF)) { + r = 0xFFFD; + } + if (r <= 0x7F) { + return String.fromCharCode(r); + } + if (r <= 0x7FF) { + return String.fromCharCode(0xC0 | r >> 6, 0x80 | (r & 0x3F)); + } + if (r <= 0xFFFF) { + return String.fromCharCode(0xE0 | r >> 12, 0x80 | (r >> 6 & 0x3F), 0x80 | (r & 0x3F)); + } + return String.fromCharCode(0xF0 | r >> 18, 0x80 | (r >> 12 & 0x3F), 0x80 | (r >> 6 & 0x3F), 0x80 | (r & 0x3F)); +}; + +var $stringToBytes = str => { + var array = new Uint8Array(str.length); + for (var i = 0; i < str.length; i++) { + array[i] = str.charCodeAt(i); + } + return array; +}; + +var $bytesToString = slice => { + if (slice.$length === 0) { + return ""; + } + var str = ""; + for (var i = 0; i < slice.$length; i += 10000) { + str += String.fromCharCode.apply(undefined, slice.$array.subarray(slice.$offset + i, slice.$offset + Math.min(slice.$length, i + 10000))); + } + return str; +}; + +var $stringToRunes = str => { + var array = new Int32Array(str.length); + var rune, j = 0; + for (var i = 0; i < str.length; i += rune[1], j++) { + rune = $decodeRune(str, i); + array[j] = rune[0]; + } + return array.subarray(0, j); +}; + +var $runesToString = slice => { + if (slice.$length === 0) { + return ""; + } + var str = ""; + for (var i = 0; i < slice.$length; i++) { + str += $encodeRune(slice.$array[slice.$offset + i]); + } + return str; +}; + +var $copyString = (dst, src) => { + var n = Math.min(src.length, dst.$length); + for (var i = 0; i < n; i++) { + dst.$array[dst.$offset + i] = src.charCodeAt(i); + } + return n; +}; + +var $copySlice = (dst, src) => { + var n = Math.min(src.$length, dst.$length); + $copyArray(dst.$array, src.$array, dst.$offset, src.$offset, n, dst.constructor.elem); + return n; +}; + +var $copyArray = (dst, src, dstOffset, srcOffset, n, elem) => { + if (n === 0 || (dst === src && dstOffset === srcOffset)) { + return; + } + + if (src.subarray) { + dst.set(src.subarray(srcOffset, srcOffset + n), dstOffset); + return; + } + + switch (elem.kind) { + case $kindArray: + case $kindStruct: + if (dst === src && dstOffset > srcOffset) { + for (var i = n - 1; i >= 0; i--) { + elem.copy(dst[dstOffset + i], src[srcOffset + i]); + } + return; + } + for (var i = 0; i < n; i++) { + elem.copy(dst[dstOffset + i], src[srcOffset + i]); + } + return; + } + + if (dst === src && dstOffset > srcOffset) { + for (var i = n - 1; i >= 0; i--) { + dst[dstOffset + i] = src[srcOffset + i]; + } + return; + } + for (var i = 0; i < n; i++) { + dst[dstOffset + i] = src[srcOffset + i]; + } +}; + +var $clone = (src, type) => { + var clone = type.zero(); + type.copy(clone, src); + return clone; +}; + +var $pointerOfStructConversion = (obj, type) => { + if (obj.$proxies === undefined) { + obj.$proxies = {}; + obj.$proxies[obj.constructor.string] = obj; + } + var proxy = obj.$proxies[type.string]; + if (proxy === undefined) { + var properties = {}; + for (var i = 0; i < type.elem.fields.length; i++) { + (fieldProp => { + properties[fieldProp] = { + get() { return obj[fieldProp]; }, + set(value) { obj[fieldProp] = value; } + }; + })(type.elem.fields[i].prop); + } + proxy = Object.create(type.prototype, properties); + proxy.$val = proxy; + obj.$proxies[type.string] = proxy; + proxy.$proxies = obj.$proxies; + } + return proxy; +}; + +var $append = function (slice) { + return $internalAppend(slice, arguments, 1, arguments.length - 1); +}; + +var $appendSlice = (slice, toAppend) => { + if (toAppend.constructor === String) { + var bytes = $stringToBytes(toAppend); + return $internalAppend(slice, bytes, 0, bytes.length); + } + return $internalAppend(slice, toAppend.$array, toAppend.$offset, toAppend.$length); +}; + +var $internalAppend = (slice, array, offset, length) => { + if (length === 0) { + return slice; + } + + var newArray = slice.$array; + var newOffset = slice.$offset; + var newLength = slice.$length + length; + var newCapacity = slice.$capacity; + + if (newLength > newCapacity) { + newOffset = 0; + newCapacity = Math.max(newLength, slice.$capacity < 1024 ? slice.$capacity * 2 : Math.floor(slice.$capacity * 5 / 4)); + + if (slice.$array.constructor === Array) { + newArray = slice.$array.slice(slice.$offset, slice.$offset + slice.$length); + newArray.length = newCapacity; + var zero = slice.constructor.elem.zero; + for (var i = slice.$length; i < newCapacity; i++) { + newArray[i] = zero(); + } + } else { + newArray = new slice.$array.constructor(newCapacity); + newArray.set(slice.$array.subarray(slice.$offset, slice.$offset + slice.$length)); + } + } + + $copyArray(newArray, array, newOffset + slice.$length, offset, length, slice.constructor.elem); + + var newSlice = new slice.constructor(newArray); + newSlice.$offset = newOffset; + newSlice.$length = newLength; + newSlice.$capacity = newCapacity; + return newSlice; +}; + +var $equal = (a, b, type) => { + if (type === $jsObjectPtr) { + return a === b; + } + switch (type.kind) { + case $kindComplex64: + case $kindComplex128: + return a.$real === b.$real && a.$imag === b.$imag; + case $kindInt64: + case $kindUint64: + return a.$high === b.$high && a.$low === b.$low; + case $kindArray: + if (a.length !== b.length) { + return false; + } + for (var i = 0; i < a.length; i++) { + if (!$equal(a[i], b[i], type.elem)) { + return false; + } + } + return true; + case $kindStruct: + for (var i = 0; i < type.fields.length; i++) { + var f = type.fields[i]; + if (!$equal(a[f.prop], b[f.prop], f.typ)) { + return false; + } + } + return true; + case $kindInterface: + return $interfaceIsEqual(a, b); + default: + return a === b; + } +}; + +var $interfaceIsEqual = (a, b) => { + if (a === $ifaceNil || b === $ifaceNil) { + return a === b; + } + if (a.constructor !== b.constructor) { + return false; + } + if (a.constructor === $jsObjectPtr) { + return a.object === b.object; + } + if (!a.constructor.comparable) { + $throwRuntimeError("comparing uncomparable type " + a.constructor.string); + } + return $equal(a.$val, b.$val, a.constructor); +}; + +var $unsafeMethodToFunction = (typ, name, isPtr) => { + if (isPtr) { + return (r, ...args) => { + var ptrType = $ptrType(typ); + if (r.constructor != ptrType) { + switch (typ.kind) { + case $kindStruct: + r = $pointerOfStructConversion(r, ptrType); + break; + case $kindArray: + r = new ptrType(r); + break; + default: + r = new ptrType(r.$get, r.$set, r.$target); + } + } + return r[name](...args); + }; + } else { + return (r, ...args) => { + var ptrType = $ptrType(typ); + if (r.constructor != ptrType) { + switch (typ.kind) { + case $kindStruct: + r = $clone(r, typ); + break; + case $kindSlice: + r = $convertSliceType(r, typ); + break; + case $kindComplex64: + case $kindComplex128: + r = new typ(r.$real, r.$imag); + break; + default: + r = new typ(r); + } + } + return r[name](...args); + }; + } +}; + +var $id = x => { + return x; +}; + +var $instanceOf = (x, y) => { + return x instanceof y; +}; + +var $typeOf = x => { + return typeof (x); +}; diff --git a/compiler/prelude/prelude_min.go b/compiler/prelude/prelude_min.go deleted file mode 100644 index 0918ffa0b..000000000 --- a/compiler/prelude/prelude_min.go +++ /dev/null @@ -1,6 +0,0 @@ -// Code generated by genmin; DO NOT EDIT. - -package prelude - -// Minified is an uglifyjs-minified version of Prelude. -const Minified = "var $global,$module;if(Error.stackTraceLimit=1/0,\"undefined\"!=typeof window?$global=window:\"undefined\"!=typeof self?$global=self:\"undefined\"!=typeof global?($global=global).require=require:$global=this,void 0===$global||void 0===$global.Array)throw new Error(\"no global object found\");\"undefined\"!=typeof module&&($module=module);var $throwRuntimeError,$packages={},$idCounter=0,$keys=function(e){return e?Object.keys(e):[]},$flushConsole=function(){},$throwNilPointerError=function(){$throwRuntimeError(\"invalid memory address or nil pointer dereference\")},$call=function(e,n,r){return e.apply(n,r)},$makeFunc=function(e){return function(){return $externalize(e(this,new($sliceType($jsObjectPtr))($global.Array.prototype.slice.call(arguments,[]))),$emptyInterface)}},$unused=function(e){},$mapArray=function(e,n){for(var r=new e.constructor(e.length),t=0;te.$capacity||t>e.$capacity)&&$throwRuntimeError(\"slice bounds out of range\"),e===e.constructor.nil)return e;var i=new e.constructor(e.$array);return i.$offset=e.$offset+n,i.$length=r-n,i.$capacity=t-n,i},$substring=function(e,n,r){return(n<0||re.length)&&$throwRuntimeError(\"slice bounds out of range\"),e.substring(n,r)},$sliceToArray=function(e){return e.$array.constructor!==Array?e.$array.subarray(e.$offset,e.$offset+e.$length):e.$array.slice(e.$offset,e.$offset+e.$length)},$decodeRune=function(e,n){var r=e.charCodeAt(n);if(r<128)return[r,1];if(r!=r||r<192)return[65533,1];var t=e.charCodeAt(n+1);if(t!=t||t<128||192<=t)return[65533,1];if(r<224)return(a=(31&r)<<6|63&t)<=127?[65533,1]:[a,2];var i=e.charCodeAt(n+2);if(i!=i||i<128||192<=i)return[65533,1];if(r<240)return(a=(15&r)<<12|(63&t)<<6|63&i)<=2047?[65533,1]:55296<=a&&a<=57343?[65533,1]:[a,3];var a,o=e.charCodeAt(n+3);return 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e.constructor((e.$real*o+e.$imag)/$,(e.$imag*o-e.$real)/$)}o=n.$imag/n.$real,$=n.$imag*o+n.$real;return new e.constructor((e.$imag*o+e.$real)/$,(e.$imag-e.$real*o)/$)},$kindBool=1,$kindInt=2,$kindInt8=3,$kindInt16=4,$kindInt32=5,$kindInt64=6,$kindUint=7,$kindUint8=8,$kindUint16=9,$kindUint32=10,$kindUint64=11,$kindUintptr=12,$kindFloat32=13,$kindFloat64=14,$kindComplex64=15,$kindComplex128=16,$kindArray=17,$kindChan=18,$kindFunc=19,$kindInterface=20,$kindMap=21,$kindPtr=22,$kindSlice=23,$kindString=24,$kindStruct=25,$kindUnsafePointer=26,$methodSynthesizers=[],$addMethodSynthesizer=function(e){null!==$methodSynthesizers?$methodSynthesizers.push(e):e()},$synthesizeMethods=function(){$methodSynthesizers.forEach(function(e){e()}),$methodSynthesizers=null},$ifaceKeyFor=function(e){if(e===$ifaceNil)return\"nil\";var n=e.constructor;return n.string+\"$\"+n.keyFor(e.$val)},$identity=function(e){return e},$typeIDCounter=0,$idKey=function(e){return void 0===e.$id&&($idCounter++,e.$id=$idCounter),String(e.$id)},$newType=function(e,n,r,t,i,a,o){var $;switch(n){case $kindBool:case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindUnsafePointer:($=function(e){this.$val=e}).wrapped=!0,$.keyFor=$identity;break;case $kindString:($=function(e){this.$val=e}).wrapped=!0,$.keyFor=function(e){return\"$\"+e};break;case $kindFloat32:case $kindFloat64:($=function(e){this.$val=e}).wrapped=!0,$.keyFor=function(e){return $floatKey(e)};break;case $kindInt64:($=function(e,n){this.$high=e+Math.floor(Math.ceil(n)/4294967296)>>0,this.$low=n>>>0,this.$val=this}).keyFor=function(e){return e.$high+\"$\"+e.$low};break;case $kindUint64:($=function(e,n){this.$high=e+Math.floor(Math.ceil(n)/4294967296)>>>0,this.$low=n>>>0,this.$val=this}).keyFor=function(e){return e.$high+\"$\"+e.$low};break;case $kindComplex64:($=function(e,n){this.$real=$fround(e),this.$imag=$fround(n),this.$val=this}).keyFor=function(e){return e.$real+\"$\"+e.$imag};break;case $kindComplex128:($=function(e,n){this.$real=e,this.$imag=n,this.$val=this}).keyFor=function(e){return e.$real+\"$\"+e.$imag};break;case $kindArray:($=function(e){this.$val=e}).wrapped=!0,$.ptr=$newType(4,$kindPtr,\"*\"+r,!1,\"\",!1,function(e){this.$get=function(){return e},this.$set=function(e){$.copy(this,e)},this.$val=e}),$.init=function(e,n){$.elem=e,$.len=n,$.comparable=e.comparable,$.keyFor=function(n){return Array.prototype.join.call($mapArray(n,function(n){return String(e.keyFor(n)).replace(/\\\\/g,\"\\\\\\\\\").replace(/\\$/g,\"\\\\$\")}),\"$\")},$.copy=function(n,r){$copyArray(n,r,0,0,r.length,e)},$.ptr.init($),Object.defineProperty($.ptr.nil,\"nilCheck\",{get:$throwNilPointerError})};break;case $kindChan:($=function(e){this.$val=e}).wrapped=!0,$.keyFor=$idKey,$.init=function(e,n,r){$.elem=e,$.sendOnly=n,$.recvOnly=r};break;case $kindFunc:($=function(e){this.$val=e}).wrapped=!0,$.init=function(e,n,r){$.params=e,$.results=n,$.variadic=r,$.comparable=!1};break;case $kindInterface:($={implementedBy:{},missingMethodFor:{}}).keyFor=$ifaceKeyFor,$.init=function(e){$.methods=e,e.forEach(function(e){$ifaceNil[e.prop]=$throwNilPointerError})};break;case $kindMap:($=function(e){this.$val=e}).wrapped=!0,$.init=function(e,n){$.key=e,$.elem=n,$.comparable=!1};break;case $kindPtr:($=o||function(e,n,r){this.$get=e,this.$set=n,this.$target=r,this.$val=this}).keyFor=$idKey,$.init=function(e){$.elem=e,$.wrapped=e.kind===$kindArray,$.nil=new $($throwNilPointerError,$throwNilPointerError)};break;case $kindSlice:($=function(e){e.constructor!==$.nativeArray&&(e=new 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e.methodSetCache=[],Object.keys(n).sort().forEach(function(r){e.methodSetCache.push(n[r])}),e.methodSetCache},$Bool=$newType(1,$kindBool,\"bool\",!0,\"\",!1,null),$Int=$newType(4,$kindInt,\"int\",!0,\"\",!1,null),$Int8=$newType(1,$kindInt8,\"int8\",!0,\"\",!1,null),$Int16=$newType(2,$kindInt16,\"int16\",!0,\"\",!1,null),$Int32=$newType(4,$kindInt32,\"int32\",!0,\"\",!1,null),$Int64=$newType(8,$kindInt64,\"int64\",!0,\"\",!1,null),$Uint=$newType(4,$kindUint,\"uint\",!0,\"\",!1,null),$Uint8=$newType(1,$kindUint8,\"uint8\",!0,\"\",!1,null),$Uint16=$newType(2,$kindUint16,\"uint16\",!0,\"\",!1,null),$Uint32=$newType(4,$kindUint32,\"uint32\",!0,\"\",!1,null),$Uint64=$newType(8,$kindUint64,\"uint64\",!0,\"\",!1,null),$Uintptr=$newType(4,$kindUintptr,\"uintptr\",!0,\"\",!1,null),$Float32=$newType(4,$kindFloat32,\"float32\",!0,\"\",!1,null),$Float64=$newType(8,$kindFloat64,\"float64\",!0,\"\",!1,null),$Complex64=$newType(8,$kindComplex64,\"complex64\",!0,\"\",!1,null),$Complex128=$newType(16,$kindComplex128,\"complex128\",!0,\"\",!1,null),$String=$newType(8,$kindString,\"string\",!0,\"\",!1,null),$UnsafePointer=$newType(4,$kindUnsafePointer,\"unsafe.Pointer\",!0,\"\",!1,null),$nativeArray=function(e){switch(e){case $kindInt:return Int32Array;case $kindInt8:return Int8Array;case $kindInt16:return Int16Array;case $kindInt32:return Int32Array;case $kindUint:return Uint32Array;case $kindUint8:return Uint8Array;case $kindUint16:return Uint16Array;case $kindUint32:case $kindUintptr:return Uint32Array;case $kindFloat32:return Float32Array;case $kindFloat64:return Float64Array;default:return Array}},$toNativeArray=function(e,n){var r=$nativeArray(e);return r===Array?n:new r(n)},$arrayTypes={},$arrayType=function(e,n){var r=e.id+\"$\"+n,t=$arrayTypes[r];return void 0===t&&(t=$newType(12,$kindArray,\"[\"+n+\"]\"+e.string,!1,\"\",!1,null),$arrayTypes[r]=t,t.init(e,n)),t},$chanType=function(e,n,r){var t=(r?\"<-\":\"\")+\"chan\"+(n?\"<- \":\" \")+e.string,i=n?\"SendChan\":r?\"RecvChan\":\"Chan\",a=e[i];return void 0===a&&(a=$newType(4,$kindChan,t,!1,\"\",!1,null),e[i]=a,a.init(e,n,r)),a},$Chan=function(e,n){(n<0||n>2147483647)&&$throwRuntimeError(\"makechan: size out of 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{}\";0!==e.length&&(t=\"interface { \"+$mapArray(e,function(e){return(\"\"!==e.pkg?e.pkg+\".\":\"\")+e.name+e.typ.string.substr(4)}).join(\"; \")+\" }\"),r=$newType(8,$kindInterface,t,!1,\"\",!1,null),$interfaceTypes[n]=r,r.init(e)}return r},$emptyInterface=$interfaceType([]),$ifaceNil={},$error=$newType(8,$kindInterface,\"error\",!0,\"\",!1,null);$error.init([{prop:\"Error\",name:\"Error\",pkg:\"\",typ:$funcType([],[$String],!1)}]);var $panicValue,$jsObjectPtr,$jsErrorPtr,$mapTypes={},$mapType=function(e,n){var r=e.id+\"$\"+n.id,t=$mapTypes[r];return void 0===t&&(t=$newType(4,$kindMap,\"map[\"+e.string+\"]\"+n.string,!1,\"\",!1,null),$mapTypes[r]=t,t.init(e,n)),t},$makeMap=function(e,n){for(var r={},t=0;t2147483647)&&$throwRuntimeError(\"makeslice: len out of range\"),(r<0||r2147483647)&&$throwRuntimeError(\"makeslice: cap out of range\");var t=new e.nativeArray(r);if(e.nativeArray===Array)for(var i=0;i=$curGoroutine.deferStack.length)throw n;if(null!==n){var t=null;try{$curGoroutine.deferStack.push(e),$panic(new $jsErrorPtr(n))}catch(e){t=e}return $curGoroutine.deferStack.pop(),void $callDeferred(e,t)}if(!$curGoroutine.asleep){$stackDepthOffset--;var i=$panicStackDepth,a=$panicValue,o=$curGoroutine.panicStack.pop();void 0!==o&&($panicStackDepth=$getStackDepth(),$panicValue=o);try{for(;;){if(null===e&&void 0===(e=$curGoroutine.deferStack[$curGoroutine.deferStack.length-1])){if($panicStackDepth=null,o.Object instanceof Error)throw o.Object;var $;throw $=o.constructor===$String?o.$val:void 0!==o.Error?o.Error():void 0!==o.String?o.String():o,new Error($)}var c=e.pop();if(void 0===c){if($curGoroutine.deferStack.pop(),void 0!==o){e=null;continue}return}var u=c[0].apply(c[2],c[1]);if(u&&void 0!==u.$blk){if(e.push([u.$blk,[],u]),r)throw null;return}if(void 0!==o&&null===$panicStackDepth)throw null}}finally{void 0!==o&&(null!==$panicStackDepth&&$curGoroutine.panicStack.push(o),$panicStackDepth=i,$panicValue=a),$stackDepthOffset++}}},$panic=function(e){$curGoroutine.panicStack.push(e),$callDeferred(null,null,!0)},$recover=function(){return null===$panicStackDepth||void 0!==$panicStackDepth&&$panicStackDepth!==$getStackDepth()-2?$ifaceNil:($panicStackDepth=null,$panicValue)},$throw=function(e){throw e},$noGoroutine={asleep:!1,exit:!1,deferStack:[],panicStack:[]},$curGoroutine=$noGoroutine,$totalGoroutines=0,$awakeGoroutines=0,$checkForDeadlock=!0,$mainFinished=!1,$go=function(e,n){$totalGoroutines++,$awakeGoroutines++;var r=function(){try{$curGoroutine=r;var t=e.apply(void 0,n);if(t&&void 0!==t.$blk)return e=function(){return t.$blk()},void(n=[]);r.exit=!0}catch(e){if(!r.exit)throw e}finally{$curGoroutine=$noGoroutine,r.exit&&($totalGoroutines--,r.asleep=!0),r.asleep&&($awakeGoroutines--,!$mainFinished&&0===$awakeGoroutines&&$checkForDeadlock&&(console.error(\"fatal error: all goroutines are asleep - deadlock!\"),void 0!==$global.process&&$global.process.exit(2)))}};r.asleep=!1,r.exit=!1,r.deferStack=[],r.panicStack=[],$schedule(r)},$scheduled=[],$runScheduled=function(){try{for(var e;void 0!==(e=$scheduled.shift());)e()}finally{$scheduled.length>0&&setTimeout($runScheduled,0)}},$schedule=function(e){e.asleep&&(e.asleep=!1,$awakeGoroutines++),$scheduled.push(e),$curGoroutine===$noGoroutine&&$runScheduled()},$setTimeout=function(e,n){return $awakeGoroutines++,setTimeout(function(){$awakeGoroutines--,e()},n)},$block=function(){$curGoroutine===$noGoroutine&&$throwRuntimeError(\"cannot block in JavaScript callback, fix by wrapping code in goroutine\"),$curGoroutine.asleep=!0},$send=function(e,n){e.$closed&&$throwRuntimeError(\"send on closed channel\");var r=e.$recvQueue.shift();if(void 0===r){if(!(e.$buffer.length65535){var u=Math.floor((c-65536)/1024)+55296,l=(c-65536)%1024+56320;$+=String.fromCharCode(u,l)}else $+=String.fromCharCode(c)}return $;case $kindStruct:var s=$packages.time;if(void 0!==s&&e.constructor===s.Time.ptr){var f=$div64(e.UnixNano(),new $Int64(0,1e6));return new Date($flatten64(f))}var d={},p=function(e,n){if(n===$jsObjectPtr)return e;switch(n.kind){case $kindPtr:return e===n.nil?d:p(e.$get(),n.elem);case $kindStruct:var r=n.fields[0];return p(e[r.prop],r.typ);case $kindInterface:return p(e.$val,e.constructor);default:return d}},h=p(e,n);if(h!==d)return h;h={};for(i=0;i>24;case $kindInt16:return parseInt(e)<<16>>16;case $kindInt32:return parseInt(e)>>0;case $kindUint:return parseInt(e);case $kindUint8:return parseInt(e)<<24>>>24;case $kindUint16:return parseInt(e)<<16>>>16;case $kindUint32:case $kindUintptr:return parseInt(e)>>>0;case $kindInt64:case $kindUint64:return new n(0,e);case $kindFloat32:case $kindFloat64:return parseFloat(e);case $kindArray:return e.length!==n.len&&$throwRuntimeError(\"got array with wrong size from JavaScript native\"),$mapArray(e,function(e){return $internalize(e,n.elem)});case $kindFunc:return function(){for(var t=[],i=0;i=128)return!1;return!0};\n" diff --git a/compiler/prelude/types.go b/compiler/prelude/types.go deleted file mode 100644 index 0d37509ba..000000000 --- a/compiler/prelude/types.go +++ /dev/null @@ -1,747 +0,0 @@ -package prelude - -const types = ` -var $kindBool = 1; -var $kindInt = 2; -var $kindInt8 = 3; -var $kindInt16 = 4; -var $kindInt32 = 5; -var $kindInt64 = 6; -var $kindUint = 7; -var $kindUint8 = 8; -var $kindUint16 = 9; -var $kindUint32 = 10; -var $kindUint64 = 11; -var $kindUintptr = 12; -var $kindFloat32 = 13; -var $kindFloat64 = 14; -var $kindComplex64 = 15; -var $kindComplex128 = 16; -var $kindArray = 17; -var $kindChan = 18; -var $kindFunc = 19; -var $kindInterface = 20; -var $kindMap = 21; -var $kindPtr = 22; -var $kindSlice = 23; -var $kindString = 24; -var $kindStruct = 25; -var $kindUnsafePointer = 26; - -var $methodSynthesizers = []; -var $addMethodSynthesizer = function(f) { - if ($methodSynthesizers === null) { - f(); - return; - } - $methodSynthesizers.push(f); -}; -var $synthesizeMethods = function() { - $methodSynthesizers.forEach(function(f) { f(); }); - $methodSynthesizers = null; -}; - -var $ifaceKeyFor = function(x) { - if (x === $ifaceNil) { - return 'nil'; - } - var c = x.constructor; - return c.string + '$' + c.keyFor(x.$val); -}; - -var $identity = function(x) { return x; }; - -var $typeIDCounter = 0; - -var $idKey = function(x) { - if (x.$id === undefined) { - $idCounter++; - x.$id = $idCounter; - } - return String(x.$id); -}; - -var $newType = function(size, kind, string, named, pkg, exported, constructor) { - var typ; - switch(kind) { - case $kindBool: - case $kindInt: - case $kindInt8: - case $kindInt16: - case $kindInt32: - case $kindUint: - case $kindUint8: - case $kindUint16: - case $kindUint32: - case $kindUintptr: - case $kindUnsafePointer: - typ = function(v) { this.$val = v; }; - typ.wrapped = true; - typ.keyFor = $identity; - break; - - case $kindString: - typ = function(v) { this.$val = v; }; - typ.wrapped = true; - typ.keyFor = function(x) { return "$" + x; }; - break; - - case $kindFloat32: - case $kindFloat64: - typ = function(v) { this.$val = v; }; - typ.wrapped = true; - typ.keyFor = function(x) { return $floatKey(x); }; - break; - - case $kindInt64: - typ = function(high, low) { - this.$high = (high + Math.floor(Math.ceil(low) / 4294967296)) >> 0; - this.$low = low >>> 0; - this.$val = this; - }; - typ.keyFor = function(x) { return x.$high + "$" + x.$low; }; - break; - - case $kindUint64: - typ = function(high, low) { - this.$high = (high + Math.floor(Math.ceil(low) / 4294967296)) >>> 0; - this.$low = low >>> 0; - this.$val = this; - }; - typ.keyFor = function(x) { return x.$high + "$" + x.$low; }; - break; - - case $kindComplex64: - typ = function(real, imag) { - this.$real = $fround(real); - this.$imag = $fround(imag); - this.$val = this; - }; - typ.keyFor = function(x) { return x.$real + "$" + x.$imag; }; - break; - - case $kindComplex128: - typ = function(real, imag) { - this.$real = real; - this.$imag = imag; - this.$val = this; - }; - typ.keyFor = function(x) { return x.$real + "$" + x.$imag; }; - break; - - case $kindArray: - typ = function(v) { this.$val = v; }; - typ.wrapped = true; - typ.ptr = $newType(4, $kindPtr, "*" + string, false, "", false, function(array) { - this.$get = function() { return array; }; - this.$set = function(v) { typ.copy(this, v); }; - this.$val = array; - }); - typ.init = function(elem, len) { - typ.elem = elem; - typ.len = len; - typ.comparable = elem.comparable; - typ.keyFor = function(x) { - return Array.prototype.join.call($mapArray(x, function(e) { - return String(elem.keyFor(e)).replace(/\\/g, "\\\\").replace(/\$/g, "\\$"); - }), "$"); - }; - typ.copy = function(dst, src) { - $copyArray(dst, src, 0, 0, src.length, elem); - }; - typ.ptr.init(typ); - Object.defineProperty(typ.ptr.nil, "nilCheck", { get: $throwNilPointerError }); - }; - break; - - case $kindChan: - typ = function(v) { this.$val = v; }; - typ.wrapped = true; - typ.keyFor = $idKey; - typ.init = function(elem, sendOnly, recvOnly) { - typ.elem = elem; - typ.sendOnly = sendOnly; - typ.recvOnly = recvOnly; - }; - break; - - case $kindFunc: - typ = function(v) { this.$val = v; }; - typ.wrapped = true; - typ.init = function(params, results, variadic) { - typ.params = params; - typ.results = results; - typ.variadic = variadic; - typ.comparable = false; - }; - break; - - case $kindInterface: - typ = { implementedBy: {}, missingMethodFor: {} }; - typ.keyFor = $ifaceKeyFor; - typ.init = function(methods) { - typ.methods = methods; - methods.forEach(function(m) { - $ifaceNil[m.prop] = $throwNilPointerError; - }); - }; - break; - - case $kindMap: - typ = function(v) { this.$val = v; }; - typ.wrapped = true; - typ.init = function(key, elem) { - typ.key = key; - typ.elem = elem; - typ.comparable = false; - }; - break; - - case $kindPtr: - typ = constructor || function(getter, setter, target) { - this.$get = getter; - this.$set = setter; - this.$target = target; - this.$val = this; - }; - typ.keyFor = $idKey; - typ.init = function(elem) { - typ.elem = elem; - typ.wrapped = (elem.kind === $kindArray); - typ.nil = new typ($throwNilPointerError, $throwNilPointerError); - }; - break; - - case $kindSlice: - typ = function(array) { - if (array.constructor !== typ.nativeArray) { - array = new typ.nativeArray(array); - } - this.$array = array; - this.$offset = 0; - this.$length = array.length; - this.$capacity = array.length; - this.$val = this; - }; - typ.init = function(elem) { - typ.elem = elem; - typ.comparable = false; - typ.nativeArray = $nativeArray(elem.kind); - typ.nil = new typ([]); - }; - break; - - case $kindStruct: - typ = function(v) { this.$val = v; }; - typ.wrapped = true; - typ.ptr = $newType(4, $kindPtr, "*" + string, false, pkg, exported, constructor); - typ.ptr.elem = typ; - typ.ptr.prototype.$get = function() { return this; }; - typ.ptr.prototype.$set = function(v) { typ.copy(this, v); }; - typ.init = function(pkgPath, fields) { - typ.pkgPath = pkgPath; - typ.fields = fields; - fields.forEach(function(f) { - if (!f.typ.comparable) { - typ.comparable = false; - } - }); - typ.keyFor = function(x) { - var val = x.$val; - return $mapArray(fields, function(f) { - return String(f.typ.keyFor(val[f.prop])).replace(/\\/g, "\\\\").replace(/\$/g, "\\$"); - }).join("$"); - }; - typ.copy = function(dst, src) { - for (var i = 0; i < fields.length; i++) { - var f = fields[i]; - switch (f.typ.kind) { - case $kindArray: - case $kindStruct: - f.typ.copy(dst[f.prop], src[f.prop]); - continue; - default: - dst[f.prop] = src[f.prop]; - continue; - } - } - }; - /* nil value */ - var properties = {}; - fields.forEach(function(f) { - properties[f.prop] = { get: $throwNilPointerError, set: $throwNilPointerError }; - }); - typ.ptr.nil = Object.create(constructor.prototype, properties); - typ.ptr.nil.$val = typ.ptr.nil; - /* methods for embedded fields */ - $addMethodSynthesizer(function() { - var synthesizeMethod = function(target, m, f) { - if (target.prototype[m.prop] !== undefined) { return; } - target.prototype[m.prop] = function() { - var v = this.$val[f.prop]; - if (f.typ === $jsObjectPtr) { - v = new $jsObjectPtr(v); - } - if (v.$val === undefined) { - v = new f.typ(v); - } - return v[m.prop].apply(v, arguments); - }; - }; - fields.forEach(function(f) { - if (f.embedded) { - $methodSet(f.typ).forEach(function(m) { - synthesizeMethod(typ, m, f); - synthesizeMethod(typ.ptr, m, f); - }); - $methodSet($ptrType(f.typ)).forEach(function(m) { - synthesizeMethod(typ.ptr, m, f); - }); - } - }); - }); - }; - break; - - default: - $panic(new $String("invalid kind: " + kind)); - } - - switch (kind) { - case $kindBool: - case $kindMap: - typ.zero = function() { return false; }; - break; - - case $kindInt: - case $kindInt8: - case $kindInt16: - case $kindInt32: - case $kindUint: - case $kindUint8 : - case $kindUint16: - case $kindUint32: - case $kindUintptr: - case $kindUnsafePointer: - case $kindFloat32: - case $kindFloat64: - typ.zero = function() { return 0; }; - break; - - case $kindString: - typ.zero = function() { return ""; }; - break; - - case $kindInt64: - case $kindUint64: - case $kindComplex64: - case $kindComplex128: - var zero = new typ(0, 0); - typ.zero = function() { return zero; }; - break; - - case $kindPtr: - case $kindSlice: - typ.zero = function() { return typ.nil; }; - break; - - case $kindChan: - typ.zero = function() { return $chanNil; }; - break; - - case $kindFunc: - typ.zero = function() { return $throwNilPointerError; }; - break; - - case $kindInterface: - typ.zero = function() { return $ifaceNil; }; - break; - - case $kindArray: - typ.zero = function() { - var arrayClass = $nativeArray(typ.elem.kind); - if (arrayClass !== Array) { - return new arrayClass(typ.len); - } - var array = new Array(typ.len); - for (var i = 0; i < typ.len; i++) { - array[i] = typ.elem.zero(); - } - return array; - }; - break; - - case $kindStruct: - typ.zero = function() { return new typ.ptr(); }; - break; - - default: - $panic(new $String("invalid kind: " + kind)); - } - - typ.id = $typeIDCounter; - $typeIDCounter++; - typ.size = size; - typ.kind = kind; - typ.string = string; - typ.named = named; - typ.pkg = pkg; - typ.exported = exported; - typ.methods = []; - typ.methodSetCache = null; - typ.comparable = true; - return typ; -}; - -var $methodSet = function(typ) { - if (typ.methodSetCache !== null) { - return typ.methodSetCache; - } - var base = {}; - - var isPtr = (typ.kind === $kindPtr); - if (isPtr && typ.elem.kind === $kindInterface) { - typ.methodSetCache = []; - return []; - } - - var current = [{typ: isPtr ? typ.elem : typ, indirect: isPtr}]; - - var seen = {}; - - while (current.length > 0) { - var next = []; - var mset = []; - - current.forEach(function(e) { - if (seen[e.typ.string]) { - return; - } - seen[e.typ.string] = true; - - if (e.typ.named) { - mset = mset.concat(e.typ.methods); - if (e.indirect) { - mset = mset.concat($ptrType(e.typ).methods); - } - } - - switch (e.typ.kind) { - case $kindStruct: - e.typ.fields.forEach(function(f) { - if (f.embedded) { - var fTyp = f.typ; - var fIsPtr = (fTyp.kind === $kindPtr); - next.push({typ: fIsPtr ? fTyp.elem : fTyp, indirect: e.indirect || fIsPtr}); - } - }); - break; - - case $kindInterface: - mset = mset.concat(e.typ.methods); - break; - } - }); - - mset.forEach(function(m) { - if (base[m.name] === undefined) { - base[m.name] = m; - } - }); - - current = next; - } - - typ.methodSetCache = []; - Object.keys(base).sort().forEach(function(name) { - typ.methodSetCache.push(base[name]); - }); - return typ.methodSetCache; -}; - -var $Bool = $newType( 1, $kindBool, "bool", true, "", false, null); -var $Int = $newType( 4, $kindInt, "int", true, "", false, null); -var $Int8 = $newType( 1, $kindInt8, "int8", true, "", false, null); -var $Int16 = $newType( 2, $kindInt16, "int16", true, "", false, null); -var $Int32 = $newType( 4, $kindInt32, "int32", true, "", false, null); -var $Int64 = $newType( 8, $kindInt64, "int64", true, "", false, null); -var $Uint = $newType( 4, $kindUint, "uint", true, "", false, null); -var $Uint8 = $newType( 1, $kindUint8, "uint8", true, "", false, null); -var $Uint16 = $newType( 2, $kindUint16, "uint16", true, "", false, null); -var $Uint32 = $newType( 4, $kindUint32, "uint32", true, "", false, null); -var $Uint64 = $newType( 8, $kindUint64, "uint64", true, "", false, null); -var $Uintptr = $newType( 4, $kindUintptr, "uintptr", true, "", false, null); -var $Float32 = $newType( 4, $kindFloat32, "float32", true, "", false, null); -var $Float64 = $newType( 8, $kindFloat64, "float64", true, "", false, null); -var $Complex64 = $newType( 8, $kindComplex64, "complex64", true, "", false, null); -var $Complex128 = $newType(16, $kindComplex128, "complex128", true, "", false, null); -var $String = $newType( 8, $kindString, "string", true, "", false, null); -var $UnsafePointer = $newType( 4, $kindUnsafePointer, "unsafe.Pointer", true, "", false, null); - -var $nativeArray = function(elemKind) { - switch (elemKind) { - case $kindInt: - return Int32Array; - case $kindInt8: - return Int8Array; - case $kindInt16: - return Int16Array; - case $kindInt32: - return Int32Array; - case $kindUint: - return Uint32Array; - case $kindUint8: - return Uint8Array; - case $kindUint16: - return Uint16Array; - case $kindUint32: - return Uint32Array; - case $kindUintptr: - return Uint32Array; - case $kindFloat32: - return Float32Array; - case $kindFloat64: - return Float64Array; - default: - return Array; - } -}; -var $toNativeArray = function(elemKind, array) { - var nativeArray = $nativeArray(elemKind); - if (nativeArray === Array) { - return array; - } - return new nativeArray(array); -}; -var $arrayTypes = {}; -var $arrayType = function(elem, len) { - var typeKey = elem.id + "$" + len; - var typ = $arrayTypes[typeKey]; - if (typ === undefined) { - typ = $newType(12, $kindArray, "[" + len + "]" + elem.string, false, "", false, null); - $arrayTypes[typeKey] = typ; - typ.init(elem, len); - } - return typ; -}; - -var $chanType = function(elem, sendOnly, recvOnly) { - var string = (recvOnly ? "<-" : "") + "chan" + (sendOnly ? "<- " : " ") + elem.string; - var field = sendOnly ? "SendChan" : (recvOnly ? "RecvChan" : "Chan"); - var typ = elem[field]; - if (typ === undefined) { - typ = $newType(4, $kindChan, string, false, "", false, null); - elem[field] = typ; - typ.init(elem, sendOnly, recvOnly); - } - return typ; -}; -var $Chan = function(elem, capacity) { - if (capacity < 0 || capacity > 2147483647) { - $throwRuntimeError("makechan: size out of range"); - } - this.$elem = elem; - this.$capacity = capacity; - this.$buffer = []; - this.$sendQueue = []; - this.$recvQueue = []; - this.$closed = false; -}; -var $chanNil = new $Chan(null, 0); -$chanNil.$sendQueue = $chanNil.$recvQueue = { length: 0, push: function() {}, shift: function() { return undefined; }, indexOf: function() { return -1; } }; - -var $funcTypes = {}; -var $funcType = function(params, results, variadic) { - var typeKey = $mapArray(params, function(p) { return p.id; }).join(",") + "$" + $mapArray(results, function(r) { return r.id; }).join(",") + "$" + variadic; - var typ = $funcTypes[typeKey]; - if (typ === undefined) { - var paramTypes = $mapArray(params, function(p) { return p.string; }); - if (variadic) { - paramTypes[paramTypes.length - 1] = "..." + paramTypes[paramTypes.length - 1].substr(2); - } - var string = "func(" + paramTypes.join(", ") + ")"; - if (results.length === 1) { - string += " " + results[0].string; - } else if (results.length > 1) { - string += " (" + $mapArray(results, function(r) { return r.string; }).join(", ") + ")"; - } - typ = $newType(4, $kindFunc, string, false, "", false, null); - $funcTypes[typeKey] = typ; - typ.init(params, results, variadic); - } - return typ; -}; - -var $interfaceTypes = {}; -var $interfaceType = function(methods) { - var typeKey = $mapArray(methods, function(m) { return m.pkg + "," + m.name + "," + m.typ.id; }).join("$"); - var typ = $interfaceTypes[typeKey]; - if (typ === undefined) { - var string = "interface {}"; - if (methods.length !== 0) { - string = "interface { " + $mapArray(methods, function(m) { - return (m.pkg !== "" ? m.pkg + "." : "") + m.name + m.typ.string.substr(4); - }).join("; ") + " }"; - } - typ = $newType(8, $kindInterface, string, false, "", false, null); - $interfaceTypes[typeKey] = typ; - typ.init(methods); - } - return typ; -}; -var $emptyInterface = $interfaceType([]); -var $ifaceNil = {}; -var $error = $newType(8, $kindInterface, "error", true, "", false, null); -$error.init([{prop: "Error", name: "Error", pkg: "", typ: $funcType([], [$String], false)}]); - -var $mapTypes = {}; -var $mapType = function(key, elem) { - var typeKey = key.id + "$" + elem.id; - var typ = $mapTypes[typeKey]; - if (typ === undefined) { - typ = $newType(4, $kindMap, "map[" + key.string + "]" + elem.string, false, "", false, null); - $mapTypes[typeKey] = typ; - typ.init(key, elem); - } - return typ; -}; -var $makeMap = function(keyForFunc, entries) { - var m = {}; - for (var i = 0; i < entries.length; i++) { - var e = entries[i]; - m[keyForFunc(e.k)] = e; - } - return m; -}; - -var $ptrType = function(elem) { - var typ = elem.ptr; - if (typ === undefined) { - typ = $newType(4, $kindPtr, "*" + elem.string, false, "", elem.exported, null); - elem.ptr = typ; - typ.init(elem); - } - return typ; -}; - -var $newDataPointer = function(data, constructor) { - if (constructor.elem.kind === $kindStruct) { - return data; - } - return new constructor(function() { return data; }, function(v) { data = v; }); -}; - -var $indexPtr = function(array, index, constructor) { - array.$ptr = array.$ptr || {}; - return array.$ptr[index] || (array.$ptr[index] = new constructor(function() { return array[index]; }, function(v) { array[index] = v; })); -}; - -var $sliceType = function(elem) { - var typ = elem.slice; - if (typ === undefined) { - typ = $newType(12, $kindSlice, "[]" + elem.string, false, "", false, null); - elem.slice = typ; - typ.init(elem); - } - return typ; -}; -var $makeSlice = function(typ, length, capacity) { - capacity = capacity || length; - if (length < 0 || length > 2147483647) { - $throwRuntimeError("makeslice: len out of range"); - } - if (capacity < 0 || capacity < length || capacity > 2147483647) { - $throwRuntimeError("makeslice: cap out of range"); - } - var array = new typ.nativeArray(capacity); - if (typ.nativeArray === Array) { - for (var i = 0; i < capacity; i++) { - array[i] = typ.elem.zero(); - } - } - var slice = new typ(array); - slice.$length = length; - return slice; -}; - -var $structTypes = {}; -var $structType = function(pkgPath, fields) { - var typeKey = $mapArray(fields, function(f) { return f.name + "," + f.typ.id + "," + f.tag; }).join("$"); - var typ = $structTypes[typeKey]; - if (typ === undefined) { - var string = "struct { " + $mapArray(fields, function(f) { - return f.name + " " + f.typ.string + (f.tag !== "" ? (" \"" + f.tag.replace(/\\/g, "\\\\").replace(/"/g, "\\\"") + "\"") : ""); - }).join("; ") + " }"; - if (fields.length === 0) { - string = "struct {}"; - } - typ = $newType(0, $kindStruct, string, false, "", false, function() { - this.$val = this; - for (var i = 0; i < fields.length; i++) { - var f = fields[i]; - var arg = arguments[i]; - this[f.prop] = arg !== undefined ? arg : f.typ.zero(); - } - }); - $structTypes[typeKey] = typ; - typ.init(pkgPath, fields); - } - return typ; -}; - -var $assertType = function(value, type, returnTuple) { - var isInterface = (type.kind === $kindInterface), ok, missingMethod = ""; - if (value === $ifaceNil) { - ok = false; - } else if (!isInterface) { - ok = value.constructor === type; - } else { - var valueTypeString = value.constructor.string; - ok = type.implementedBy[valueTypeString]; - if (ok === undefined) { - ok = true; - var valueMethodSet = $methodSet(value.constructor); - var interfaceMethods = type.methods; - for (var i = 0; i < interfaceMethods.length; i++) { - var tm = interfaceMethods[i]; - var found = false; - for (var j = 0; j < valueMethodSet.length; j++) { - var vm = valueMethodSet[j]; - if (vm.name === tm.name && vm.pkg === tm.pkg && vm.typ === tm.typ) { - found = true; - break; - } - } - if (!found) { - ok = false; - type.missingMethodFor[valueTypeString] = tm.name; - break; - } - } - type.implementedBy[valueTypeString] = ok; - } - if (!ok) { - missingMethod = type.missingMethodFor[valueTypeString]; - } - } - - if (!ok) { - if (returnTuple) { - return [type.zero(), false]; - } - $panic(new $packages["runtime"].TypeAssertionError.ptr( - $packages["runtime"]._type.ptr.nil, - (value === $ifaceNil ? $packages["runtime"]._type.ptr.nil : new $packages["runtime"]._type.ptr(value.constructor.string)), - new $packages["runtime"]._type.ptr(type.string), - missingMethod)); - } - - if (!isInterface) { - value = value.$val; - } - if (type === $jsObjectPtr) { - value = value.object; - } - return returnTuple ? [value, true] : value; -}; -` diff --git a/compiler/prelude/types.js b/compiler/prelude/types.js new file mode 100644 index 000000000..9570b2fed --- /dev/null +++ b/compiler/prelude/types.js @@ -0,0 +1,769 @@ +var $kindBool = 1; +var $kindInt = 2; +var $kindInt8 = 3; +var $kindInt16 = 4; +var $kindInt32 = 5; +var $kindInt64 = 6; +var $kindUint = 7; +var $kindUint8 = 8; +var $kindUint16 = 9; +var $kindUint32 = 10; +var $kindUint64 = 11; +var $kindUintptr = 12; +var $kindFloat32 = 13; +var $kindFloat64 = 14; +var $kindComplex64 = 15; +var $kindComplex128 = 16; +var $kindArray = 17; +var $kindChan = 18; +var $kindFunc = 19; +var $kindInterface = 20; +var $kindMap = 21; +var $kindPtr = 22; +var $kindSlice = 23; +var $kindString = 24; +var $kindStruct = 25; +var $kindUnsafePointer = 26; + +var $methodSynthesizers = []; +var $addMethodSynthesizer = f => { + if ($methodSynthesizers === null) { + f(); + return; + } + $methodSynthesizers.push(f); +}; +var $synthesizeMethods = () => { + $methodSynthesizers.forEach(f => { f(); }); + $methodSynthesizers = null; +}; + +var $ifaceKeyFor = x => { + if (x === $ifaceNil) { + return 'nil'; + } + var c = x.constructor; + return c.string + '$' + c.keyFor(x.$val); +}; + +var $identity = x => { return x; }; + +var $typeIDCounter = 0; + +var $idKey = x => { + if (x.$id === undefined) { + $idCounter++; + x.$id = $idCounter; + } + return String(x.$id); +}; + +// Creates constructor functions for array pointer types. Returns a new function +// instance each time to make sure each type is independent of the other. +var $arrayPtrCtor = () => { + return function (array) { + this.$get = () => { return array; }; + this.$set = function (v) { typ.copy(this, v); }; + this.$val = array; + }; +} + +var $newType = (size, kind, string, named, pkg, exported, constructor) => { + var typ; + switch (kind) { + case $kindBool: + case $kindInt: + case $kindInt8: + case $kindInt16: + case $kindInt32: + case $kindUint: + case $kindUint8: + case $kindUint16: + case $kindUint32: + case $kindUintptr: + case $kindUnsafePointer: + typ = function (v) { this.$val = v; }; + typ.wrapped = true; + typ.keyFor = $identity; + break; + + case $kindString: + typ = function (v) { this.$val = v; }; + typ.wrapped = true; + typ.keyFor = x => { return "$" + x; }; + break; + + case $kindFloat32: + case $kindFloat64: + typ = function (v) { this.$val = v; }; + typ.wrapped = true; + typ.keyFor = x => { return $floatKey(x); }; + break; + + case $kindInt64: + typ = function (high, low) { + this.$high = (high + Math.floor(Math.ceil(low) / 4294967296)) >> 0; + this.$low = low >>> 0; + this.$val = this; + }; + typ.keyFor = x => { return x.$high + "$" + x.$low; }; + break; + + case $kindUint64: + typ = function (high, low) { + this.$high = (high + Math.floor(Math.ceil(low) / 4294967296)) >>> 0; + this.$low = low >>> 0; + this.$val = this; + }; + typ.keyFor = x => { return x.$high + "$" + x.$low; }; + break; + + case $kindComplex64: + typ = function (real, imag) { + this.$real = $fround(real); + this.$imag = $fround(imag); + this.$val = this; + }; + typ.keyFor = x => { return x.$real + "$" + x.$imag; }; + break; + + case $kindComplex128: + typ = function (real, imag) { + this.$real = real; + this.$imag = imag; + this.$val = this; + }; + typ.keyFor = x => { return x.$real + "$" + x.$imag; }; + break; + + case $kindArray: + typ = function (v) { this.$val = v; }; + typ.wrapped = true; + typ.ptr = $newType(4, $kindPtr, "*" + string, false, "", false, $arrayPtrCtor()); + typ.init = (elem, len) => { + typ.elem = elem; + typ.len = len; + typ.comparable = elem.comparable; + typ.keyFor = x => { + return Array.prototype.join.call($mapArray(x, e => { + return String(elem.keyFor(e)).replace(/\\/g, "\\\\").replace(/\$/g, "\\$"); + }), "$"); + }; + typ.copy = (dst, src) => { + $copyArray(dst, src, 0, 0, src.length, elem); + }; + typ.ptr.init(typ); + Object.defineProperty(typ.ptr.nil, "nilCheck", { get: $throwNilPointerError }); + }; + break; + + case $kindChan: + typ = function (v) { this.$val = v; }; + typ.wrapped = true; + typ.keyFor = $idKey; + typ.init = (elem, sendOnly, recvOnly) => { + typ.elem = elem; + typ.sendOnly = sendOnly; + typ.recvOnly = recvOnly; + }; + break; + + case $kindFunc: + typ = function (v) { this.$val = v; }; + typ.wrapped = true; + typ.init = (params, results, variadic) => { + typ.params = params; + typ.results = results; + typ.variadic = variadic; + typ.comparable = false; + }; + break; + + case $kindInterface: + typ = { implementedBy: {}, missingMethodFor: {} }; + typ.keyFor = $ifaceKeyFor; + typ.init = methods => { + typ.methods = methods; + methods.forEach(m => { + $ifaceNil[m.prop] = $throwNilPointerError; + }); + }; + break; + + case $kindMap: + typ = function (v) { this.$val = v; }; + typ.wrapped = true; + typ.init = (key, elem) => { + typ.key = key; + typ.elem = elem; + typ.comparable = false; + }; + break; + + case $kindPtr: + typ = constructor || function (getter, setter, target) { + this.$get = getter; + this.$set = setter; + this.$target = target; + this.$val = this; + }; + typ.keyFor = $idKey; + typ.init = elem => { + typ.elem = elem; + typ.wrapped = (elem.kind === $kindArray); + typ.nil = new typ($throwNilPointerError, $throwNilPointerError); + }; + break; + + case $kindSlice: + typ = function (array) { + if (array.constructor !== typ.nativeArray) { + array = new typ.nativeArray(array); + } + this.$array = array; + this.$offset = 0; + this.$length = array.length; + this.$capacity = array.length; + this.$val = this; + }; + typ.init = elem => { + typ.elem = elem; + typ.comparable = false; + typ.nativeArray = $nativeArray(elem.kind); + typ.nil = new typ([]); + }; + break; + + case $kindStruct: + typ = function (v) { this.$val = v; }; + typ.wrapped = true; + typ.ptr = $newType(4, $kindPtr, "*" + string, false, pkg, exported, constructor); + typ.ptr.elem = typ; + typ.ptr.prototype.$get = function () { return this; }; + typ.ptr.prototype.$set = function (v) { typ.copy(this, v); }; + typ.init = (pkgPath, fields) => { + typ.pkgPath = pkgPath; + typ.fields = fields; + fields.forEach(f => { + if (!f.typ.comparable) { + typ.comparable = false; + } + }); + typ.keyFor = x => { + var val = x.$val; + return $mapArray(fields, f => { + return String(f.typ.keyFor(val[f.prop])).replace(/\\/g, "\\\\").replace(/\$/g, "\\$"); + }).join("$"); + }; + typ.copy = (dst, src) => { + for (var i = 0; i < fields.length; i++) { + var f = fields[i]; + switch (f.typ.kind) { + case $kindArray: + case $kindStruct: + f.typ.copy(dst[f.prop], src[f.prop]); + continue; + default: + dst[f.prop] = src[f.prop]; + continue; + } + } + }; + /* nil value */ + var properties = {}; + fields.forEach(f => { + properties[f.prop] = { get: $throwNilPointerError, set: $throwNilPointerError }; + }); + typ.ptr.nil = Object.create(constructor.prototype, properties); + typ.ptr.nil.$val = typ.ptr.nil; + /* methods for embedded fields */ + $addMethodSynthesizer(() => { + var synthesizeMethod = (target, m, f) => { + if (target.prototype[m.prop] !== undefined) { return; } + target.prototype[m.prop] = function(...args) { + var v = this.$val[f.prop]; + if (f.typ === $jsObjectPtr) { + v = new $jsObjectPtr(v); + } + if (v.$val === undefined) { + v = new f.typ(v); + } + return v[m.prop](...args); + }; + }; + fields.forEach(f => { + if (f.embedded) { + $methodSet(f.typ).forEach(m => { + synthesizeMethod(typ, m, f); + synthesizeMethod(typ.ptr, m, f); + }); + $methodSet($ptrType(f.typ)).forEach(m => { + synthesizeMethod(typ.ptr, m, f); + }); + } + }); + }); + }; + break; + + default: + $panic(new $String("invalid kind: " + kind)); + } + + switch (kind) { + case $kindBool: + case $kindMap: + typ.zero = () => { return false; }; + break; + + case $kindInt: + case $kindInt8: + case $kindInt16: + case $kindInt32: + case $kindUint: + case $kindUint8: + case $kindUint16: + case $kindUint32: + case $kindUintptr: + case $kindUnsafePointer: + case $kindFloat32: + case $kindFloat64: + typ.zero = () => { return 0; }; + break; + + case $kindString: + typ.zero = () => { return ""; }; + break; + + case $kindInt64: + case $kindUint64: + case $kindComplex64: + case $kindComplex128: + var zero = new typ(0, 0); + typ.zero = () => { return zero; }; + break; + + case $kindPtr: + case $kindSlice: + typ.zero = () => { return typ.nil; }; + break; + + case $kindChan: + typ.zero = () => { return $chanNil; }; + break; + + case $kindFunc: + typ.zero = () => { return $throwNilPointerError; }; + break; + + case $kindInterface: + typ.zero = () => { return $ifaceNil; }; + break; + + case $kindArray: + typ.zero = () => { + var arrayClass = $nativeArray(typ.elem.kind); + if (arrayClass !== Array) { + return new arrayClass(typ.len); + } + var array = new Array(typ.len); + for (var i = 0; i < typ.len; i++) { + array[i] = typ.elem.zero(); + } + return array; + }; + break; + + case $kindStruct: + typ.zero = () => { return new typ.ptr(); }; + break; + + default: + $panic(new $String("invalid kind: " + kind)); + } + + typ.id = $typeIDCounter; + $typeIDCounter++; + typ.size = size; + typ.kind = kind; + typ.string = string; + typ.named = named; + typ.pkg = pkg; + typ.exported = exported; + typ.methods = []; + typ.methodSetCache = null; + typ.comparable = true; + return typ; +}; + +var $methodSet = typ => { + if (typ.methodSetCache !== null) { + return typ.methodSetCache; + } + var base = {}; + + var isPtr = (typ.kind === $kindPtr); + if (isPtr && typ.elem.kind === $kindInterface) { + typ.methodSetCache = []; + return []; + } + + var current = [{ typ: isPtr ? typ.elem : typ, indirect: isPtr }]; + + var seen = {}; + + while (current.length > 0) { + var next = []; + var mset = []; + + current.forEach(e => { + if (seen[e.typ.string]) { + return; + } + seen[e.typ.string] = true; + + if (e.typ.named) { + mset = mset.concat(e.typ.methods); + if (e.indirect) { + mset = mset.concat($ptrType(e.typ).methods); + } + } + + switch (e.typ.kind) { + case $kindStruct: + e.typ.fields.forEach(f => { + if (f.embedded) { + var fTyp = f.typ; + var fIsPtr = (fTyp.kind === $kindPtr); + next.push({ typ: fIsPtr ? fTyp.elem : fTyp, indirect: e.indirect || fIsPtr }); + } + }); + break; + + case $kindInterface: + mset = mset.concat(e.typ.methods); + break; + } + }); + + mset.forEach(m => { + if (base[m.name] === undefined) { + base[m.name] = m; + } + }); + + current = next; + } + + typ.methodSetCache = []; + Object.keys(base).sort().forEach(name => { + typ.methodSetCache.push(base[name]); + }); + return typ.methodSetCache; +}; + +var $Bool = $newType(1, $kindBool, "bool", true, "", false, null); +var $Int = $newType(4, $kindInt, "int", true, "", false, null); +var $Int8 = $newType(1, $kindInt8, "int8", true, "", false, null); +var $Int16 = $newType(2, $kindInt16, "int16", true, "", false, null); +var $Int32 = $newType(4, $kindInt32, "int32", true, "", false, null); +var $Int64 = $newType(8, $kindInt64, "int64", true, "", false, null); +var $Uint = $newType(4, $kindUint, "uint", true, "", false, null); +var $Uint8 = $newType(1, $kindUint8, "uint8", true, "", false, null); +var $Uint16 = $newType(2, $kindUint16, "uint16", true, "", false, null); +var $Uint32 = $newType(4, $kindUint32, "uint32", true, "", false, null); +var $Uint64 = $newType(8, $kindUint64, "uint64", true, "", false, null); +var $Uintptr = $newType(4, $kindUintptr, "uintptr", true, "", false, null); +var $Float32 = $newType(4, $kindFloat32, "float32", true, "", false, null); +var $Float64 = $newType(8, $kindFloat64, "float64", true, "", false, null); +var $Complex64 = $newType(8, $kindComplex64, "complex64", true, "", false, null); +var $Complex128 = $newType(16, $kindComplex128, "complex128", true, "", false, null); +var $String = $newType(8, $kindString, "string", true, "", false, null); +var $UnsafePointer = $newType(4, $kindUnsafePointer, "unsafe.Pointer", true, "unsafe", false, null); + +var $nativeArray = elemKind => { + switch (elemKind) { + case $kindInt: + return Int32Array; + case $kindInt8: + return Int8Array; + case $kindInt16: + return Int16Array; + case $kindInt32: + return Int32Array; + case $kindUint: + return Uint32Array; + case $kindUint8: + return Uint8Array; + case $kindUint16: + return Uint16Array; + case $kindUint32: + return Uint32Array; + case $kindUintptr: + return Uint32Array; + case $kindFloat32: + return Float32Array; + case $kindFloat64: + return Float64Array; + default: + return Array; + } +}; +var $toNativeArray = (elemKind, array) => { + var nativeArray = $nativeArray(elemKind); + if (nativeArray === Array) { + return array; + } + return new nativeArray(array); +}; +var $arrayTypes = {}; +var $arrayType = (elem, len) => { + var typeKey = elem.id + "$" + len; + var typ = $arrayTypes[typeKey]; + if (typ === undefined) { + typ = $newType(elem.size * len, $kindArray, "[" + len + "]" + elem.string, false, "", false, null); + $arrayTypes[typeKey] = typ; + typ.init(elem, len); + } + return typ; +}; + +var $chanType = (elem, sendOnly, recvOnly) => { + var string = (recvOnly ? "<-" : "") + "chan" + (sendOnly ? "<- " : " "); + if (!sendOnly && !recvOnly && (elem.string[0] == "<")) { + string += "(" + elem.string + ")"; + } else { + string += elem.string; + } + var field = sendOnly ? "SendChan" : (recvOnly ? "RecvChan" : "Chan"); + var typ = elem[field]; + if (typ === undefined) { + typ = $newType(4, $kindChan, string, false, "", false, null); + elem[field] = typ; + typ.init(elem, sendOnly, recvOnly); + } + return typ; +}; +var $Chan = function (elem, capacity) { + if (capacity < 0 || capacity > 2147483647) { + $throwRuntimeError("makechan: size out of range"); + } + this.$elem = elem; + this.$capacity = capacity; + this.$buffer = []; + this.$sendQueue = []; + this.$recvQueue = []; + this.$closed = false; +}; +var $chanNil = new $Chan(null, 0); +$chanNil.$sendQueue = $chanNil.$recvQueue = { length: 0, push() { }, shift() { return undefined; }, indexOf() { return -1; } }; + +var $funcTypes = {}; +var $funcType = (params, results, variadic) => { + var typeKey = $mapArray(params, p => { return p.id; }).join(",") + "$" + $mapArray(results, r => { return r.id; }).join(",") + "$" + variadic; + var typ = $funcTypes[typeKey]; + if (typ === undefined) { + var paramTypes = $mapArray(params, p => { return p.string; }); + if (variadic) { + paramTypes[paramTypes.length - 1] = "..." + paramTypes[paramTypes.length - 1].substr(2); + } + var string = "func(" + paramTypes.join(", ") + ")"; + if (results.length === 1) { + string += " " + results[0].string; + } else if (results.length > 1) { + string += " (" + $mapArray(results, r => { return r.string; }).join(", ") + ")"; + } + typ = $newType(4, $kindFunc, string, false, "", false, null); + $funcTypes[typeKey] = typ; + typ.init(params, results, variadic); + } + return typ; +}; + +var $interfaceTypes = {}; +var $interfaceType = methods => { + var typeKey = $mapArray(methods, m => { return m.pkg + "," + m.name + "," + m.typ.id; }).join("$"); + var typ = $interfaceTypes[typeKey]; + if (typ === undefined) { + var string = "interface {}"; + if (methods.length !== 0) { + string = "interface { " + $mapArray(methods, m => { + return (m.pkg !== "" ? m.pkg + "." : "") + m.name + m.typ.string.substr(4); + }).join("; ") + " }"; + } + typ = $newType(8, $kindInterface, string, false, "", false, null); + $interfaceTypes[typeKey] = typ; + typ.init(methods); + } + return typ; +}; +var $emptyInterface = $interfaceType([]); +var $ifaceNil = {}; +var $error = $newType(8, $kindInterface, "error", true, "", false, null); +$error.init([{ prop: "Error", name: "Error", pkg: "", typ: $funcType([], [$String], false) }]); + +var $mapTypes = {}; +var $mapType = (key, elem) => { + var typeKey = key.id + "$" + elem.id; + var typ = $mapTypes[typeKey]; + if (typ === undefined) { + typ = $newType(4, $kindMap, "map[" + key.string + "]" + elem.string, false, "", false, null); + $mapTypes[typeKey] = typ; + typ.init(key, elem); + } + return typ; +}; +var $makeMap = (keyForFunc, entries) => { + var m = new Map(); + for (var i = 0; i < entries.length; i++) { + var e = entries[i]; + m.set(keyForFunc(e.k), e); + } + return m; +}; + +var $ptrType = elem => { + var typ = elem.ptr; + if (typ === undefined) { + typ = $newType(4, $kindPtr, "*" + elem.string, false, "", elem.exported, null); + elem.ptr = typ; + typ.init(elem); + } + return typ; +}; + +var $newDataPointer = (data, constructor) => { + if (constructor.elem.kind === $kindStruct) { + return data; + } + return new constructor(() => { return data; }, v => { data = v; }); +}; + +var $indexPtr = (array, index, constructor) => { + if (array.buffer) { + // Pointers to the same underlying ArrayBuffer share cache. + var cache = array.buffer.$ptr = array.buffer.$ptr || {}; + // Pointers of different primitive types are non-comparable and stored in different caches. + var typeCache = cache[array.name] = cache[array.name] || {}; + var cacheIdx = array.BYTES_PER_ELEMENT * index + array.byteOffset; + return typeCache[cacheIdx] || (typeCache[cacheIdx] = new constructor(() => { return array[index]; }, v => { array[index] = v; })); + } else { + array.$ptr = array.$ptr || {}; + return array.$ptr[index] || (array.$ptr[index] = new constructor(() => { return array[index]; }, v => { array[index] = v; })); + } +}; + +var $sliceType = elem => { + var typ = elem.slice; + if (typ === undefined) { + typ = $newType(12, $kindSlice, "[]" + elem.string, false, "", false, null); + elem.slice = typ; + typ.init(elem); + } + return typ; +}; +var $makeSlice = (typ, length, capacity = length) => { + if (length < 0 || length > 2147483647) { + $throwRuntimeError("makeslice: len out of range"); + } + if (capacity < 0 || capacity < length || capacity > 2147483647) { + $throwRuntimeError("makeslice: cap out of range"); + } + var array = new typ.nativeArray(capacity); + if (typ.nativeArray === Array) { + for (var i = 0; i < capacity; i++) { + array[i] = typ.elem.zero(); + } + } + var slice = new typ(array); + slice.$length = length; + return slice; +}; + +var $structTypes = {}; +var $structType = (pkgPath, fields) => { + var typeKey = $mapArray(fields, f => { return f.name + "," + f.typ.id + "," + f.tag; }).join("$"); + var typ = $structTypes[typeKey]; + if (typ === undefined) { + var string = "struct { " + $mapArray(fields, f => { + var str = f.typ.string + (f.tag !== "" ? (" \"" + f.tag.replace(/\\/g, "\\\\").replace(/"/g, "\\\"") + "\"") : ""); + if (f.embedded) { + return str; + } + return f.name + " " + str; + }).join("; ") + " }"; + if (fields.length === 0) { + string = "struct {}"; + } + typ = $newType(0, $kindStruct, string, false, "", false, function(...args) { + this.$val = this; + for (var i = 0; i < fields.length; i++) { + var f = fields[i]; + if (f.name == '_') { + continue; + } + var arg = args[i]; + this[f.prop] = arg !== undefined ? arg : f.typ.zero(); + } + }); + $structTypes[typeKey] = typ; + typ.init(pkgPath, fields); + } + return typ; +}; + +var $assertType = (value, type, returnTuple) => { + var isInterface = (type.kind === $kindInterface), ok, missingMethod = ""; + if (value === $ifaceNil) { + ok = false; + } else if (!isInterface) { + ok = value.constructor === type; + } else { + var valueTypeString = value.constructor.string; + ok = type.implementedBy[valueTypeString]; + if (ok === undefined) { + ok = true; + var valueMethodSet = $methodSet(value.constructor); + var interfaceMethods = type.methods; + for (var i = 0; i < interfaceMethods.length; i++) { + var tm = interfaceMethods[i]; + var found = false; + for (var j = 0; j < valueMethodSet.length; j++) { + var vm = valueMethodSet[j]; + if (vm.name === tm.name && vm.pkg === tm.pkg && vm.typ === tm.typ) { + found = true; + break; + } + } + if (!found) { + ok = false; + type.missingMethodFor[valueTypeString] = tm.name; + break; + } + } + type.implementedBy[valueTypeString] = ok; + } + if (!ok) { + missingMethod = type.missingMethodFor[valueTypeString]; + } + } + + if (!ok) { + if (returnTuple) { + return [type.zero(), false]; + } + $panic(new $packages["runtime"].TypeAssertionError.ptr( + $packages["runtime"]._type.ptr.nil, + (value === $ifaceNil ? $packages["runtime"]._type.ptr.nil : new $packages["runtime"]._type.ptr(value.constructor.string)), + new $packages["runtime"]._type.ptr(type.string), + missingMethod)); + } + + if (!isInterface) { + value = value.$val; + } + if (type === $jsObjectPtr) { + value = value.object; + } + return returnTuple ? [value, true] : value; +}; diff --git a/compiler/prelude/uglifyjs_options.json b/compiler/prelude/uglifyjs_options.json index b603add95..7e7bef1ab 100644 --- a/compiler/prelude/uglifyjs_options.json +++ b/compiler/prelude/uglifyjs_options.json @@ -56,7 +56,7 @@ "keep_classnames": false, "keep_fnames": false, "properties": false, - "reserved": [], + "reserved": ["$goroutine", "$panic"], "safari10": false, "toplevel": false }, diff --git a/compiler/sources/sources.go b/compiler/sources/sources.go new file mode 100644 index 000000000..8e2d12946 --- /dev/null +++ b/compiler/sources/sources.go @@ -0,0 +1,284 @@ +package sources + +import ( + "fmt" + "go/ast" + "go/token" + "go/types" + "sort" + "strings" + + "github.com/neelance/astrewrite" + + "github.com/gopherjs/gopherjs/compiler/internal/analysis" + "github.com/gopherjs/gopherjs/compiler/internal/typeparams" + "github.com/gopherjs/gopherjs/compiler/jsFile" + "github.com/gopherjs/gopherjs/compiler/linkname" + "github.com/gopherjs/gopherjs/internal/errorList" + "github.com/gopherjs/gopherjs/internal/experiments" +) + +// Sources is a slice of parsed Go sources and additional data for a package. +// +// Note that the sources would normally belong to a single logical Go package, +// but they don't have to be a real Go package (i.e. found on the file system) +// or represent a complete package (i.e. it could be only a few source files +// compiled by `gopherjs build foo.go bar.go`). +type Sources struct { + // ImportPath representing the sources, if exists. + // + // May be empty for "virtual" + // packages like testmain or playground-generated package. + // Otherwise this must be the absolute import path for a package. + ImportPath string + + // Dir is the directory containing package sources + Dir string + + // Files is the parsed and augmented Go AST files for the package. + Files []*ast.File + + // FileSet is the file set for the parsed files. + FileSet *token.FileSet + + // JSFiles is the JavaScript files that are part of the package. + JSFiles []jsFile.JSFile + + // TypeInfo is the type information this package. + // This is nil until set by Analyze. + TypeInfo *analysis.Info + + // baseInfo is the base type information this package. + // This is nil until set by TypeCheck. + baseInfo *types.Info + + // Package is the types package for these source files. + // This is nil until set by TypeCheck. + Package *types.Package + + // GoLinknames is the set of Go linknames for this package. + // This is nil until set by ParseGoLinknames. + GoLinknames []linkname.GoLinkname +} + +type Importer func(path, srcDir string) (*Sources, error) + +// sort the Go files slice by the original source name to ensure consistent order +// of processing. This is required for reproducible JavaScript output. +// +// Note this function mutates the original Files slice. +func (s *Sources) Sort() { + sort.Slice(s.Files, func(i, j int) bool { + return s.getFileName(s.Files[i]) > s.getFileName(s.Files[j]) + }) +} + +func (s *Sources) getFileName(file *ast.File) string { + return s.FileSet.File(file.Pos()).Name() +} + +// Simplify processed each Files entry with astrewrite.Simplify. +// +// Note this function mutates the original Files slice. +// This must be called after TypeCheck and before analyze since +// this will change the pointers in the AST. For example, the pointers +// to function literals will change, making it impossible to find them +// in the type information, if analyze is called first. +func (s *Sources) Simplify() { + for i, file := range s.Files { + s.Files[i] = astrewrite.Simplify(file, s.baseInfo, false) + } +} + +// TypeCheck the sources. Returns information about declared package types and +// type information for the supplied AST. +// This will set the Package field on the Sources. +// +// If the Package field is not nil, e.g. this function has already been run, +// this will be a no-op. +// +// This must be called prior to simplify to get the types.Info used by simplify. +func (s *Sources) TypeCheck(importer Importer, sizes types.Sizes, tContext *types.Context) error { + if s.Package != nil && s.baseInfo != nil { + // type checking has already been done so return early. + return nil + } + + const errLimit = 10 // Max number of type checking errors to return. + + typesInfo := &types.Info{ + Types: make(map[ast.Expr]types.TypeAndValue), + Defs: make(map[*ast.Ident]types.Object), + Uses: make(map[*ast.Ident]types.Object), + Implicits: make(map[ast.Node]types.Object), + Selections: make(map[*ast.SelectorExpr]*types.Selection), + Scopes: make(map[ast.Node]*types.Scope), + Instances: make(map[*ast.Ident]types.Instance), + } + + var typeErrs errorList.ErrorList + + pkgImporter := &packageImporter{ + srcDir: s.Dir, + importer: importer, + sizes: sizes, + tContext: tContext, + } + + config := &types.Config{ + Context: tContext, + Importer: pkgImporter, + Sizes: sizes, + Error: func(err error) { typeErrs = typeErrs.AppendDistinct(err) }, + } + typesPkg, err := config.Check(s.ImportPath, s.FileSet, s.Files, typesInfo) + // If we encountered any import errors, it is likely that the other type errors + // are not meaningful and would be resolved by fixing imports. Return them + // separately, if any. https://github.com/gopherjs/gopherjs/issues/119. + if pkgImporter.Errors.ErrOrNil() != nil { + return pkgImporter.Errors.Trim(errLimit).ErrOrNil() + } + // Return any other type errors. + if typeErrs.ErrOrNil() != nil { + return typeErrs.Trim(errLimit).ErrOrNil() + } + // Any general errors that may have occurred during type checking. + if err != nil { + return err + } + + // If generics are not enabled, ensure the package does not requires generics support. + if !experiments.Env.Generics { + if genErr := typeparams.RequiresGenericsSupport(typesInfo); genErr != nil { + return fmt.Errorf("some packages requires generics support (https://github.com/gopherjs/gopherjs/issues/1013): %w", genErr) + } + } + + s.baseInfo = typesInfo + s.Package = typesPkg + return nil +} + +// CollectInstances will determine the type parameters instances for the package. +// +// This must be called before Analyze to have the type parameters instances +// needed during analysis. +func (s *Sources) CollectInstances(tContext *types.Context, instances *typeparams.PackageInstanceSets) { + tc := typeparams.Collector{ + TContext: tContext, + Info: s.baseInfo, + Instances: instances, + } + tc.Scan(s.Package, s.Files...) +} + +// Analyze will determine the type parameters instances, blocking, +// and other type information for the package. +// This will set the TypeInfo and Instances fields on the Sources. +// +// This must be called after to simplify to ensure the pointers +// in the AST are still valid. +// The instances must be collected prior to this call. +// +// Note that at the end of this call the analysis information +// has NOT been propagated across packages yet. +func (s *Sources) Analyze(importer Importer, tContext *types.Context, instances *typeparams.PackageInstanceSets) { + infoImporter := func(path string) (*analysis.Info, error) { + srcs, err := importer(path, s.Dir) + if err != nil { + return nil, err + } + return srcs.TypeInfo, nil + } + s.TypeInfo = analysis.AnalyzePkg(s.Files, s.FileSet, s.baseInfo, tContext, s.Package, instances, infoImporter) +} + +// ParseGoLinknames extracts all //go:linkname compiler directive from the sources. +// +// This will set the GoLinknames field on the Sources. +func (s *Sources) ParseGoLinknames() error { + goLinknames := []linkname.GoLinkname{} + var errs errorList.ErrorList + for _, file := range s.Files { + found, err := linkname.ParseGoLinknames(s.FileSet, s.ImportPath, file) + errs = errs.Append(err) + goLinknames = append(goLinknames, found...) + } + if err := errs.ErrOrNil(); err != nil { + return err + } + s.GoLinknames = goLinknames + return nil +} + +// UnresolvedImports calculates the import paths of the package's dependencies +// based on all the imports in the augmented Go AST files. +// +// This is used to determine the unresolved imports that weren't in the +// PackageData.Imports slice since they were added during augmentation or +// during template generation. +// +// The given skip paths (typically those imports from PackageData.Imports) +// will not be returned in the results. +// This will not return any `*_test` packages in the results. +func (s *Sources) UnresolvedImports(skip ...string) []string { + seen := make(map[string]struct{}) + for _, sk := range skip { + seen[sk] = struct{}{} + } + imports := []string{} + for _, file := range s.Files { + for _, imp := range file.Imports { + path := strings.Trim(imp.Path.Value, `"`) + if _, ok := seen[path]; !ok { + if !strings.HasSuffix(path, "_test") { + imports = append(imports, path) + } + seen[path] = struct{}{} + } + } + } + sort.Strings(imports) + return imports +} + +// packageImporter implements go/types.Importer interface and +// wraps it to collect import errors. +type packageImporter struct { + srcDir string + importer Importer + sizes types.Sizes + tContext *types.Context + Errors errorList.ErrorList +} + +func (pi *packageImporter) Import(path string) (*types.Package, error) { + if path == "unsafe" { + return types.Unsafe, nil + } + + srcs, err := pi.importer(path, pi.srcDir) + if err != nil { + pi.Errors = pi.Errors.AppendDistinct(err) + return nil, err + } + + // If the sources doesn't have the package determined yet, get it now, + // otherwise this will be a no-op. + // This will recursively get the packages for all of it's dependencies too. + err = srcs.TypeCheck(pi.importer, pi.sizes, pi.tContext) + if err != nil { + pi.Errors = pi.Errors.AppendDistinct(err) + return nil, err + } + + return srcs.Package, nil +} + +// SortedSourcesSlice in place sorts the given slice of Sources by ImportPath. +// This will not change the order of the files within any Sources. +func SortedSourcesSlice(sourcesSlice []*Sources) { + sort.Slice(sourcesSlice, func(i, j int) bool { + return sourcesSlice[i].ImportPath < sourcesSlice[j].ImportPath + }) +} diff --git a/compiler/statements.go b/compiler/statements.go index b83396235..17ed8b746 100644 --- a/compiler/statements.go +++ b/compiler/statements.go @@ -4,32 +4,56 @@ import ( "fmt" "go/ast" "go/constant" + "go/printer" "go/token" "go/types" "strings" - "github.com/gopherjs/gopherjs/compiler/analysis" "github.com/gopherjs/gopherjs/compiler/astutil" "github.com/gopherjs/gopherjs/compiler/filter" + "github.com/gopherjs/gopherjs/compiler/internal/analysis" "github.com/gopherjs/gopherjs/compiler/typesutil" ) -func (c *funcContext) translateStmtList(stmts []ast.Stmt) { +func (fc *funcContext) translateStmtList(stmts []ast.Stmt) { for _, stmt := range stmts { - c.translateStmt(stmt, nil) + fc.translateStmt(stmt, nil) } - c.SetPos(token.NoPos) + fc.SetPos(token.NoPos) } -func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { - c.SetPos(stmt.Pos()) +func (fc *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { + defer func() { + err := recover() + if err == nil { + return + } + if _, yes := bailingOut(err); yes { + panic(err) // Continue orderly bailout. + } + + // Oh noes, we've tried to compile something so bad that compiler panicked + // and ran away. Let's gather some debugging clues. + bail := bailout(err) + pos := stmt.Pos() + if fc.posAvailable && fc.pos.IsValid() { + pos = fc.pos + } + fmt.Fprintf(bail, "Occurred while compiling statement at %s:\n", fc.pkgCtx.fileSet.Position(pos)) + (&printer.Config{Tabwidth: 2, Indent: 1, Mode: printer.UseSpaces}).Fprint(bail, fc.pkgCtx.fileSet, stmt) + fmt.Fprintf(bail, "\n\nDetailed AST:\n") + ast.Fprint(bail, fc.pkgCtx.fileSet, stmt, ast.NotNilFilter) + panic(bail) // Initiate orderly bailout. + }() - stmt = filter.IncDecStmt(stmt, c.p.Info.Info) - stmt = filter.Assign(stmt, c.p.Info.Info, c.p.Info.Pkg) + fc.SetPos(stmt.Pos()) + + stmt = filter.IncDecStmt(stmt, fc.pkgCtx.Info.Info) + stmt = filter.Assign(stmt, fc.pkgCtx.Info.Info, fc.pkgCtx.Info.Pkg) switch s := stmt.(type) { case *ast.BlockStmt: - c.translateStmtList(s.List) + fc.translateStmtList(s.List) case *ast.IfStmt: var caseClauses []*ast.CaseClause @@ -49,7 +73,7 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { if block, ok := ifStmt.Else.(*ast.BlockStmt); ok { defaultClause = &ast.CaseClause{Body: block.List} } - c.translateBranchingStmt(caseClauses, defaultClause, false, c.translateExpr, nil, c.Flattened[s]) + fc.translateBranchingStmt(caseClauses, defaultClause, false, fc.translateExpr, nil, fc.Flattened[s]) case *ast.SwitchStmt: if s.Init != nil || s.Tag != nil || len(s.Body.List) != 1 { @@ -60,48 +84,48 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { panic("simplification error") } - prevFlowData := c.flowDatas[nil] + prevFlowData := fc.flowDatas[nil] data := &flowData{ postStmt: prevFlowData.postStmt, // for "continue" of outer loop beginCase: prevFlowData.beginCase, // same } - c.flowDatas[nil] = data - c.flowDatas[label] = data + fc.flowDatas[nil] = data + fc.flowDatas[label] = data defer func() { - delete(c.flowDatas, label) - c.flowDatas[nil] = prevFlowData + delete(fc.flowDatas, label) + fc.flowDatas[nil] = prevFlowData }() - if c.Flattened[s] { - data.endCase = c.caseCounter - c.caseCounter++ + if fc.Flattened[s] { + data.endCase = fc.caseCounter + fc.caseCounter++ - c.Indent(func() { - c.translateStmtList(clause.Body) + fc.Indented(func() { + fc.translateStmtList(clause.Body) }) - c.Printf("case %d:", data.endCase) + fc.Printf("case %d:", data.endCase) return } if label != nil || analysis.HasBreak(clause) { if label != nil { - c.Printf("%s:", label.Name()) + fc.Printf("%s:", label.Name()) } - c.Printf("switch (0) { default:") - c.Indent(func() { - c.translateStmtList(clause.Body) + fc.Printf("switch (0) { default:") + fc.Indented(func() { + fc.translateStmtList(clause.Body) }) - c.Printf("}") + fc.Printf("}") return } - c.translateStmtList(clause.Body) + fc.translateStmtList(clause.Body) case *ast.TypeSwitchStmt: if s.Init != nil { - c.translateStmt(s.Init, nil) + fc.translateStmt(s.Init, nil) } - refVar := c.newVariable("_ref") + refVar := fc.newLocalVariable("_ref") var expr ast.Expr switch a := s.Assign.(type) { case *ast.AssignStmt: @@ -109,29 +133,30 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { case *ast.ExprStmt: expr = a.X.(*ast.TypeAssertExpr).X } - c.Printf("%s = %s;", refVar, c.translateExpr(expr)) + fc.Printf("%s = %s;", refVar, fc.translateExpr(expr)) translateCond := func(cond ast.Expr) *expression { - if types.Identical(c.p.TypeOf(cond), types.Typ[types.UntypedNil]) { - return c.formatExpr("%s === $ifaceNil", refVar) + if types.Identical(fc.typeOf(cond), types.Typ[types.UntypedNil]) { + return fc.formatExpr("%s === $ifaceNil", refVar) } - return c.formatExpr("$assertType(%s, %s, true)[1]", refVar, c.typeName(c.p.TypeOf(cond))) + return fc.formatExpr("$assertType(%s, %s, true)[1]", refVar, fc.typeName(fc.typeOf(cond))) } var caseClauses []*ast.CaseClause var defaultClause *ast.CaseClause for _, cc := range s.Body.List { clause := cc.(*ast.CaseClause) var bodyPrefix []ast.Stmt - if implicit := c.p.Implicits[clause]; implicit != nil { + if implicit := fc.pkgCtx.Implicits[clause]; implicit != nil { + typ := fc.typeResolver.Substitute(implicit.Type()) value := refVar - if typesutil.IsJsObject(implicit.Type().Underlying()) { + if typesutil.IsJsObject(typ.Underlying()) { value += ".$val.object" - } else if _, ok := implicit.Type().Underlying().(*types.Interface); !ok { + } else if _, ok := typ.Underlying().(*types.Interface); !ok { value += ".$val" } bodyPrefix = []ast.Stmt{&ast.AssignStmt{ - Lhs: []ast.Expr{c.newIdent(c.objectName(implicit), implicit.Type())}, + Lhs: []ast.Expr{fc.newIdent(fc.objectName(implicit), typ)}, Tok: token.DEFINE, - Rhs: []ast.Expr{c.newIdent(value, implicit.Type())}, + Rhs: []ast.Expr{fc.newIdent(value, typ)}, }} } c := &ast.CaseClause{ @@ -144,66 +169,71 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { } caseClauses = append(caseClauses, c) } - c.translateBranchingStmt(caseClauses, defaultClause, true, translateCond, label, c.Flattened[s]) + fc.translateBranchingStmt(caseClauses, defaultClause, true, translateCond, label, fc.Flattened[s]) case *ast.ForStmt: if s.Init != nil { - c.translateStmt(s.Init, nil) + fc.translateStmt(s.Init, nil) } cond := func() string { if s.Cond == nil { return "true" } - return c.translateExpr(s.Cond).String() + return fc.translateExpr(s.Cond).String() } - c.translateLoopingStmt(cond, s.Body, nil, func() { + fc.translateLoopingStmt(cond, s.Body, nil, func() { if s.Post != nil { - c.translateStmt(s.Post, nil) + fc.translateStmt(s.Post, nil) } - }, label, c.Flattened[s]) + }, label, fc.Flattened[s]) case *ast.RangeStmt: - refVar := c.newVariable("_ref") - c.Printf("%s = %s;", refVar, c.translateExpr(s.X)) + refVar := fc.newLocalVariable("_ref") + fc.Printf("%s = %s;", refVar, fc.translateExpr(s.X)) - switch t := c.p.TypeOf(s.X).Underlying().(type) { + switch t := fc.typeOf(s.X).Underlying().(type) { case *types.Basic: - iVar := c.newVariable("_i") - c.Printf("%s = 0;", iVar) - runeVar := c.newVariable("_rune") - c.translateLoopingStmt(func() string { return iVar + " < " + refVar + ".length" }, s.Body, func() { - c.Printf("%s = $decodeRune(%s, %s);", runeVar, refVar, iVar) + iVar := fc.newLocalVariable("_i") + fc.Printf("%s = 0;", iVar) + runeVar := fc.newLocalVariable("_rune") + fc.translateLoopingStmt(func() string { return iVar + " < " + refVar + ".length" }, s.Body, func() { + fc.Printf("%s = $decodeRune(%s, %s);", runeVar, refVar, iVar) if !isBlank(s.Key) { - c.Printf("%s", c.translateAssign(s.Key, c.newIdent(iVar, types.Typ[types.Int]), s.Tok == token.DEFINE)) + fc.Printf("%s", fc.translateAssign(s.Key, fc.newIdent(iVar, types.Typ[types.Int]), s.Tok == token.DEFINE)) } if !isBlank(s.Value) { - c.Printf("%s", c.translateAssign(s.Value, c.newIdent(runeVar+"[0]", types.Typ[types.Rune]), s.Tok == token.DEFINE)) + fc.Printf("%s", fc.translateAssign(s.Value, fc.newIdent(runeVar+"[0]", types.Typ[types.Rune]), s.Tok == token.DEFINE)) } }, func() { - c.Printf("%s += %s[1];", iVar, runeVar) - }, label, c.Flattened[s]) + fc.Printf("%s += %s[1];", iVar, runeVar) + }, label, fc.Flattened[s]) case *types.Map: - iVar := c.newVariable("_i") - c.Printf("%s = 0;", iVar) - keysVar := c.newVariable("_keys") - c.Printf("%s = $keys(%s);", keysVar, refVar) - c.translateLoopingStmt(func() string { return iVar + " < " + keysVar + ".length" }, s.Body, func() { - entryVar := c.newVariable("_entry") - c.Printf("%s = %s[%s[%s]];", entryVar, refVar, keysVar, iVar) - c.translateStmt(&ast.IfStmt{ - Cond: c.newIdent(entryVar+" === undefined", types.Typ[types.Bool]), + iVar := fc.newLocalVariable("_i") + fc.Printf("%s = 0;", iVar) + keysVar := fc.newLocalVariable("_keys") + fc.Printf("%s = %s ? %s.keys() : undefined;", keysVar, refVar, refVar) + + sizeVar := fc.newLocalVariable("_size") + fc.Printf("%s = %s ? %s.size : 0;", sizeVar, refVar, refVar) + fc.translateLoopingStmt(func() string { return iVar + " < " + sizeVar }, s.Body, func() { + keyVar := fc.newLocalVariable("_key") + entryVar := fc.newLocalVariable("_entry") + fc.Printf("%s = %s.next().value;", keyVar, keysVar) + fc.Printf("%s = %s.get(%s);", entryVar, refVar, keyVar) + fc.translateStmt(&ast.IfStmt{ + Cond: fc.newIdent(entryVar+" === undefined", types.Typ[types.Bool]), Body: &ast.BlockStmt{List: []ast.Stmt{&ast.BranchStmt{Tok: token.CONTINUE}}}, }, nil) if !isBlank(s.Key) { - c.Printf("%s", c.translateAssign(s.Key, c.newIdent(entryVar+".k", t.Key()), s.Tok == token.DEFINE)) + fc.Printf("%s", fc.translateAssign(s.Key, fc.newIdent(entryVar+".k", t.Key()), s.Tok == token.DEFINE)) } if !isBlank(s.Value) { - c.Printf("%s", c.translateAssign(s.Value, c.newIdent(entryVar+".v", t.Elem()), s.Tok == token.DEFINE)) + fc.Printf("%s", fc.translateAssign(s.Value, fc.newIdent(entryVar+".v", t.Elem()), s.Tok == token.DEFINE)) } }, func() { - c.Printf("%s++;", iVar) - }, label, c.Flattened[s]) + fc.Printf("%s++;", iVar) + }, label, fc.Flattened[s]) case *types.Array, *types.Pointer, *types.Slice: var length string @@ -219,24 +249,24 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { length = refVar + ".$length" elemType = t2.Elem() } - iVar := c.newVariable("_i") - c.Printf("%s = 0;", iVar) - c.translateLoopingStmt(func() string { return iVar + " < " + length }, s.Body, func() { + iVar := fc.newLocalVariable("_i") + fc.Printf("%s = 0;", iVar) + fc.translateLoopingStmt(func() string { return iVar + " < " + length }, s.Body, func() { if !isBlank(s.Key) { - c.Printf("%s", c.translateAssign(s.Key, c.newIdent(iVar, types.Typ[types.Int]), s.Tok == token.DEFINE)) + fc.Printf("%s", fc.translateAssign(s.Key, fc.newIdent(iVar, types.Typ[types.Int]), s.Tok == token.DEFINE)) } if !isBlank(s.Value) { - c.Printf("%s", c.translateAssign(s.Value, c.setType(&ast.IndexExpr{ - X: c.newIdent(refVar, t), - Index: c.newIdent(iVar, types.Typ[types.Int]), + fc.Printf("%s", fc.translateAssign(s.Value, fc.setType(&ast.IndexExpr{ + X: fc.newIdent(refVar, t), + Index: fc.newIdent(iVar, types.Typ[types.Int]), }, elemType), s.Tok == token.DEFINE)) } }, func() { - c.Printf("%s++;", iVar) - }, label, c.Flattened[s]) + fc.Printf("%s++;", iVar) + }, label, fc.Flattened[s]) case *types.Chan: - okVar := c.newIdent(c.newVariable("_ok"), types.Typ[types.Bool]) + okVar := fc.newIdent(fc.newLocalVariable("_ok"), types.Typ[types.Bool]) key := s.Key tok := s.Tok if key == nil { @@ -252,7 +282,7 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { okVar, }, Rhs: []ast.Expr{ - c.setType(&ast.UnaryExpr{X: c.newIdent(refVar, t), Op: token.ARROW}, types.NewTuple(types.NewVar(0, nil, "", t.Elem()), types.NewVar(0, nil, "", types.Typ[types.Bool]))), + fc.setType(&ast.UnaryExpr{X: fc.newIdent(refVar, t), Op: token.ARROW}, types.NewTuple(types.NewVar(0, nil, "", t.Elem()), types.NewVar(0, nil, "", types.Typ[types.Bool]))), }, Tok: tok, }, @@ -264,8 +294,8 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { }, }, } - c.Flattened[forStmt] = true - c.translateStmt(forStmt, label) + fc.Flattened[forStmt] = true + fc.translateStmt(forStmt, label) default: panic("") @@ -274,78 +304,73 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { case *ast.BranchStmt: normalLabel := "" blockingLabel := "" - data := c.flowDatas[nil] + data := fc.flowDatas[nil] if s.Label != nil { normalLabel = " " + s.Label.Name blockingLabel = " s" // use explicit label "s", because surrounding loop may not be flattened - data = c.flowDatas[c.p.Uses[s.Label].(*types.Label)] + data = fc.flowDatas[fc.pkgCtx.Uses[s.Label].(*types.Label)] } switch s.Tok { case token.BREAK: - c.PrintCond(data.endCase == 0, fmt.Sprintf("break%s;", normalLabel), fmt.Sprintf("$s = %d; continue%s;", data.endCase, blockingLabel)) + fc.PrintCond(data.endCase == 0, fmt.Sprintf("break%s;", normalLabel), fmt.Sprintf("$s = %d; continue%s;", data.endCase, blockingLabel)) case token.CONTINUE: data.postStmt() - c.PrintCond(data.beginCase == 0, fmt.Sprintf("continue%s;", normalLabel), fmt.Sprintf("$s = %d; continue%s;", data.beginCase, blockingLabel)) + fc.PrintCond(data.beginCase == 0, fmt.Sprintf("continue%s;", normalLabel), fmt.Sprintf("$s = %d; continue%s;", data.beginCase, blockingLabel)) case token.GOTO: - c.PrintCond(false, "goto "+s.Label.Name, fmt.Sprintf("$s = %d; continue;", c.labelCase(c.p.Uses[s.Label].(*types.Label)))) + fc.PrintCond(false, "goto "+s.Label.Name, fmt.Sprintf("$s = %d; continue;", fc.labelCase(fc.pkgCtx.Uses[s.Label].(*types.Label)))) case token.FALLTHROUGH: // handled in CaseClause default: - panic("Unhandled branch statment: " + s.Tok.String()) + panic("Unhandled branch statement: " + s.Tok.String()) } case *ast.ReturnStmt: results := s.Results - if c.resultNames != nil { + if fc.resultNames != nil { if len(s.Results) != 0 { - c.translateStmt(&ast.AssignStmt{ - Lhs: c.resultNames, + fc.translateStmt(&ast.AssignStmt{ + Lhs: fc.resultNames, Tok: token.ASSIGN, Rhs: s.Results, }, nil) } - results = c.resultNames + results = fc.resultNames } - rVal := c.translateResults(results) - if len(c.Flattened) != 0 { - c.Printf("$s = -1; return%s;", rVal) + rVal := fc.translateResults(results) + + if len(fc.Flattened) == 0 { + // The function is not flattened and we don't have to worry about + // resumption. A plain return statement is sufficient. + fc.Printf("return%s;", rVal) return } - c.Printf("return%s;", rVal) - - case *ast.DeferStmt: - isBuiltin := false - isJs := false - switch fun := s.Call.Fun.(type) { - case *ast.Ident: - var builtin *types.Builtin - builtin, isBuiltin = c.p.Uses[fun].(*types.Builtin) - if isBuiltin && builtin.Name() == "recover" { - c.Printf("$deferred.push([$recover, []]);") - return - } - case *ast.SelectorExpr: - isJs = typesutil.IsJsPackage(c.p.Uses[fun.Sel].Pkg()) - } - sig := c.p.TypeOf(s.Call.Fun).Underlying().(*types.Signature) - args := c.translateArgs(sig, s.Call.Args, s.Call.Ellipsis.IsValid()) - if isBuiltin || isJs { - vars := make([]string, len(s.Call.Args)) - callArgs := make([]ast.Expr, len(s.Call.Args)) - for i, arg := range s.Call.Args { - v := c.newVariable("_arg") - vars[i] = v - callArgs[i] = c.newIdent(v, c.p.TypeOf(arg)) - } - call := c.translateExpr(&ast.CallExpr{ - Fun: s.Call.Fun, - Args: callArgs, - Ellipsis: s.Call.Ellipsis, - }) - c.Printf("$deferred.push([function(%s) { %s; }, [%s]]);", strings.Join(vars, ", "), call, strings.Join(args, ", ")) + if !fc.Blocking[s] { + // The function is flattened, but the return statement is non-blocking + // (i.e. doesn't lead to blocking deferred calls). A regular return + // is sufficient, but we also make sure to not resume function body. + fc.Printf("$s = -1; return%s;", rVal) return } - c.Printf("$deferred.push([%s, [%s]]);", c.translateExpr(s.Call.Fun), strings.Join(args, ", ")) + + if rVal != "" { + // If returned expression is non empty, evaluate and store it in a + // variable to avoid double-execution in case a deferred function blocks. + rVar := fc.newLocalVariable("$r") + fc.Printf("%s =%s;", rVar, rVal) + rVal = " " + rVar + } + + // If deferred function is blocking, we need to re-execute return statement + // upon resumption to make sure the returned value is not lost. + // See: https://github.com/gopherjs/gopherjs/issues/603. + nextCase := fc.caseCounter + fc.caseCounter++ + fc.Printf("$s = %[1]d; case %[1]d: return%[2]s;", nextCase, rVal) + return + + case *ast.DeferStmt: + callable, arglist := fc.delegatedCall(s.Call) + fc.Printf("$deferred.push([%s, %s]);", callable, arglist) case *ast.AssignStmt: if s.Tok != token.ASSIGN && s.Tok != token.DEFINE { @@ -356,35 +381,35 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { case len(s.Lhs) == 1 && len(s.Rhs) == 1: lhs := astutil.RemoveParens(s.Lhs[0]) if isBlank(lhs) { - c.Printf("$unused(%s);", c.translateExpr(s.Rhs[0])) + fc.Printf("$unused(%s);", fc.translateImplicitConversion(s.Rhs[0], fc.typeOf(s.Lhs[0]))) return } - c.Printf("%s", c.translateAssign(lhs, s.Rhs[0], s.Tok == token.DEFINE)) + fc.Printf("%s", fc.translateAssign(lhs, s.Rhs[0], s.Tok == token.DEFINE)) case len(s.Lhs) > 1 && len(s.Rhs) == 1: - tupleVar := c.newVariable("_tuple") - c.Printf("%s = %s;", tupleVar, c.translateExpr(s.Rhs[0])) - tuple := c.p.TypeOf(s.Rhs[0]).(*types.Tuple) + tupleVar := fc.newLocalVariable("_tuple") + fc.Printf("%s = %s;", tupleVar, fc.translateExpr(s.Rhs[0])) + tuple := fc.typeOf(s.Rhs[0]).(*types.Tuple) for i, lhs := range s.Lhs { lhs = astutil.RemoveParens(lhs) if !isBlank(lhs) { - c.Printf("%s", c.translateAssign(lhs, c.newIdent(fmt.Sprintf("%s[%d]", tupleVar, i), tuple.At(i).Type()), s.Tok == token.DEFINE)) + fc.Printf("%s", fc.translateAssign(lhs, fc.newIdent(fmt.Sprintf("%s[%d]", tupleVar, i), tuple.At(i).Type()), s.Tok == token.DEFINE)) } } case len(s.Lhs) == len(s.Rhs): tmpVars := make([]string, len(s.Rhs)) for i, rhs := range s.Rhs { - tmpVars[i] = c.newVariable("_tmp") + tmpVars[i] = fc.newLocalVariable("_tmp") if isBlank(astutil.RemoveParens(s.Lhs[i])) { - c.Printf("$unused(%s);", c.translateExpr(rhs)) + fc.Printf("$unused(%s);", fc.translateExpr(rhs)) continue } - c.Printf("%s", c.translateAssign(c.newIdent(tmpVars[i], c.p.TypeOf(s.Lhs[i])), rhs, true)) + fc.Printf("%s", fc.translateAssign(fc.newIdent(tmpVars[i], fc.typeOf(s.Lhs[i])), rhs, true)) } for i, lhs := range s.Lhs { lhs = astutil.RemoveParens(lhs) if !isBlank(lhs) { - c.Printf("%s", c.translateAssign(lhs, c.newIdent(tmpVars[i], c.p.TypeOf(lhs)), s.Tok == token.DEFINE)) + fc.Printf("%s", fc.translateAssign(lhs, fc.newIdent(tmpVars[i], fc.typeOf(lhs)), s.Tok == token.DEFINE)) } } @@ -407,10 +432,10 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { if len(rhs) == 0 { rhs = make([]ast.Expr, len(lhs)) for i, e := range lhs { - rhs[i] = c.zeroValue(c.p.TypeOf(e)) + rhs[i] = fc.zeroValue(fc.typeOf(e)) } } - c.translateStmt(&ast.AssignStmt{ + fc.translateStmt(&ast.AssignStmt{ Lhs: lhs, Tok: token.DEFINE, Rhs: rhs, @@ -418,42 +443,43 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { } case token.TYPE: for _, spec := range decl.Specs { - o := c.p.Defs[spec.(*ast.TypeSpec).Name].(*types.TypeName) - c.p.typeNames = append(c.p.typeNames, o) - c.p.objectNames[o] = c.newVariableWithLevel(o.Name(), true) - c.p.dependencies[o] = true + id := spec.(*ast.TypeSpec).Name + o := fc.pkgCtx.Defs[id].(*types.TypeName) + fc.pkgCtx.typeNames.Add(o) + fc.pkgCtx.DeclareDCEDep(o) } case token.CONST: // skip, constants are inlined } case *ast.ExprStmt: - expr := c.translateExpr(s.X) + expr := fc.translateExpr(s.X) if expr != nil && expr.String() != "" { - c.Printf("%s;", expr) + fc.Printf("%s;", expr) } case *ast.LabeledStmt: - label := c.p.Defs[s.Label].(*types.Label) - if c.GotoLabel[label] { - c.PrintCond(false, s.Label.Name+":", fmt.Sprintf("case %d:", c.labelCase(label))) + label := fc.pkgCtx.Defs[s.Label].(*types.Label) + if fc.GotoLabel[label] { + fc.PrintCond(false, s.Label.Name+":", fmt.Sprintf("case %d:", fc.labelCase(label))) } - c.translateStmt(s.Stmt, label) + fc.translateStmt(s.Stmt, label) case *ast.GoStmt: - c.Printf("$go(%s, [%s]);", c.translateExpr(s.Call.Fun), strings.Join(c.translateArgs(c.p.TypeOf(s.Call.Fun).Underlying().(*types.Signature), s.Call.Args, s.Call.Ellipsis.IsValid()), ", ")) + callable, arglist := fc.delegatedCall(s.Call) + fc.Printf("$go(%s, %s);", callable, arglist) case *ast.SendStmt: - chanType := c.p.TypeOf(s.Chan).Underlying().(*types.Chan) + chanType := fc.typeOf(s.Chan).Underlying().(*types.Chan) call := &ast.CallExpr{ - Fun: c.newIdent("$send", types.NewSignature(nil, types.NewTuple(types.NewVar(0, nil, "", chanType), types.NewVar(0, nil, "", chanType.Elem())), nil, false)), - Args: []ast.Expr{s.Chan, c.newIdent(c.translateImplicitConversionWithCloning(s.Value, chanType.Elem()).String(), chanType.Elem())}, + Fun: fc.newIdent("$send", types.NewSignatureType(nil, nil, nil, types.NewTuple(types.NewVar(0, nil, "", chanType), types.NewVar(0, nil, "", chanType.Elem())), nil, false)), + Args: []ast.Expr{s.Chan, fc.newIdent(fc.translateImplicitConversionWithCloning(s.Value, chanType.Elem()).String(), chanType.Elem())}, } - c.Blocking[call] = true - c.translateStmt(&ast.ExprStmt{X: call}, label) + fc.Blocking[call] = true + fc.translateStmt(&ast.ExprStmt{X: call}, label) case *ast.SelectStmt: - selectionVar := c.newVariable("_selection") + selectionVar := fc.newLocalVariable("_selection") var channels []string var caseClauses []*ast.CaseClause flattened := false @@ -465,26 +491,26 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { channels = append(channels, "[]") hasDefault = true case *ast.ExprStmt: - channels = append(channels, c.formatExpr("[%e]", astutil.RemoveParens(comm.X).(*ast.UnaryExpr).X).String()) + channels = append(channels, fc.formatExpr("[%e]", astutil.RemoveParens(comm.X).(*ast.UnaryExpr).X).String()) case *ast.AssignStmt: - channels = append(channels, c.formatExpr("[%e]", astutil.RemoveParens(comm.Rhs[0]).(*ast.UnaryExpr).X).String()) + channels = append(channels, fc.formatExpr("[%e]", astutil.RemoveParens(comm.Rhs[0]).(*ast.UnaryExpr).X).String()) case *ast.SendStmt: - chanType := c.p.TypeOf(comm.Chan).Underlying().(*types.Chan) - channels = append(channels, c.formatExpr("[%e, %s]", comm.Chan, c.translateImplicitConversionWithCloning(comm.Value, chanType.Elem())).String()) + chanType := fc.typeOf(comm.Chan).Underlying().(*types.Chan) + channels = append(channels, fc.formatExpr("[%e, %s]", comm.Chan, fc.translateImplicitConversionWithCloning(comm.Value, chanType.Elem())).String()) default: panic(fmt.Sprintf("unhandled: %T", comm)) } indexLit := &ast.BasicLit{Kind: token.INT} - c.p.Types[indexLit] = types.TypeAndValue{Type: types.Typ[types.Int], Value: constant.MakeInt64(int64(i))} + fc.pkgCtx.Types[indexLit] = types.TypeAndValue{Type: types.Typ[types.Int], Value: constant.MakeInt64(int64(i))} var bodyPrefix []ast.Stmt if assign, ok := clause.Comm.(*ast.AssignStmt); ok { - switch rhsType := c.p.TypeOf(assign.Rhs[0]).(type) { + switch rhsType := fc.typeOf(assign.Rhs[0]).(type) { case *types.Tuple: - bodyPrefix = []ast.Stmt{&ast.AssignStmt{Lhs: assign.Lhs, Rhs: []ast.Expr{c.newIdent(selectionVar+"[1]", rhsType)}, Tok: assign.Tok}} + bodyPrefix = []ast.Stmt{&ast.AssignStmt{Lhs: assign.Lhs, Rhs: []ast.Expr{fc.newIdent(selectionVar+"[1]", rhsType)}, Tok: assign.Tok}} default: - bodyPrefix = []ast.Stmt{&ast.AssignStmt{Lhs: assign.Lhs, Rhs: []ast.Expr{c.newIdent(selectionVar+"[1][0]", rhsType)}, Tok: assign.Tok}} + bodyPrefix = []ast.Stmt{&ast.AssignStmt{Lhs: assign.Lhs, Rhs: []ast.Expr{fc.newIdent(selectionVar+"[1][0]", rhsType)}, Tok: assign.Tok}} } } @@ -493,21 +519,23 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { Body: append(bodyPrefix, clause.Body...), }) - flattened = flattened || c.Flattened[clause] + flattened = flattened || fc.Flattened[clause] } - selectCall := c.setType(&ast.CallExpr{ - Fun: c.newIdent("$select", types.NewSignature(nil, types.NewTuple(types.NewVar(0, nil, "", types.NewInterface(nil, nil))), types.NewTuple(types.NewVar(0, nil, "", types.Typ[types.Int])), false)), - Args: []ast.Expr{c.newIdent(fmt.Sprintf("[%s]", strings.Join(channels, ", ")), types.NewInterface(nil, nil))}, + selectCall := fc.setType(&ast.CallExpr{ + Fun: fc.newIdent("$select", types.NewSignatureType(nil, nil, nil, types.NewTuple(types.NewVar(0, nil, "", types.NewInterfaceType(nil, nil))), types.NewTuple(types.NewVar(0, nil, "", types.Typ[types.Int])), false)), + Args: []ast.Expr{fc.newIdent(fmt.Sprintf("[%s]", strings.Join(channels, ", ")), types.NewInterfaceType(nil, nil))}, }, types.Typ[types.Int]) - c.Blocking[selectCall] = !hasDefault - c.Printf("%s = %s;", selectionVar, c.translateExpr(selectCall)) + if !hasDefault { + fc.Blocking[selectCall] = true + } + fc.Printf("%s = %s;", selectionVar, fc.translateExpr(selectCall)) if len(caseClauses) != 0 { translateCond := func(cond ast.Expr) *expression { - return c.formatExpr("%s[0] === %e", selectionVar, cond) + return fc.formatExpr("%s[0] === %e", selectionVar, cond) } - c.translateBranchingStmt(caseClauses, nil, true, translateCond, label, flattened) + fc.translateBranchingStmt(caseClauses, nil, true, translateCond, label, flattened) } case *ast.EmptyStmt: @@ -519,31 +547,31 @@ func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) { } } -func (c *funcContext) translateBranchingStmt(caseClauses []*ast.CaseClause, defaultClause *ast.CaseClause, canBreak bool, translateCond func(ast.Expr) *expression, label *types.Label, flatten bool) { +func (fc *funcContext) translateBranchingStmt(caseClauses []*ast.CaseClause, defaultClause *ast.CaseClause, canBreak bool, translateCond func(ast.Expr) *expression, label *types.Label, flatten bool) { var caseOffset, defaultCase, endCase int if flatten { - caseOffset = c.caseCounter + caseOffset = fc.caseCounter defaultCase = caseOffset + len(caseClauses) endCase = defaultCase if defaultClause != nil { endCase++ } - c.caseCounter = endCase + 1 + fc.caseCounter = endCase + 1 } hasBreak := false if canBreak { - prevFlowData := c.flowDatas[nil] + prevFlowData := fc.flowDatas[nil] data := &flowData{ postStmt: prevFlowData.postStmt, // for "continue" of outer loop beginCase: prevFlowData.beginCase, // same endCase: endCase, } - c.flowDatas[nil] = data - c.flowDatas[label] = data + fc.flowDatas[nil] = data + fc.flowDatas[label] = data defer func() { - delete(c.flowDatas, label) - c.flowDatas[nil] = prevFlowData + delete(fc.flowDatas, label) + fc.flowDatas[nil] = prevFlowData }() for _, child := range caseClauses { @@ -558,7 +586,7 @@ func (c *funcContext) translateBranchingStmt(caseClauses []*ast.CaseClause, defa } if label != nil && !flatten { - c.Printf("%s:", label.Name()) + fc.Printf("%s:", label.Name()) } condStrs := make([]string, len(caseClauses)) @@ -569,12 +597,12 @@ func (c *funcContext) translateBranchingStmt(caseClauses []*ast.CaseClause, defa } condStrs[i] = strings.Join(conds, " || ") if flatten { - c.Printf("/* */ if (%s) { $s = %d; continue; }", condStrs[i], caseOffset+i) + fc.Printf("/* */ if (%s) { $s = %d; continue; }", condStrs[i], caseOffset+i) } } if flatten { - c.Printf("/* */ $s = %d; continue;", defaultCase) + fc.Printf("/* */ $s = %d; continue;", defaultCase) } prefix := "" @@ -585,62 +613,62 @@ func (c *funcContext) translateBranchingStmt(caseClauses []*ast.CaseClause, defa } for i, clause := range caseClauses { - c.SetPos(clause.Pos()) - c.PrintCond(!flatten, fmt.Sprintf("%sif (%s) {", prefix, condStrs[i]), fmt.Sprintf("case %d:", caseOffset+i)) - c.Indent(func() { - c.translateStmtList(clause.Body) - if flatten && (i < len(caseClauses)-1 || defaultClause != nil) && !endsWithReturn(clause.Body) { - c.Printf("$s = %d; continue;", endCase) + fc.SetPos(clause.Pos()) + fc.PrintCond(!flatten, fmt.Sprintf("%sif (%s) {", prefix, condStrs[i]), fmt.Sprintf("case %d:", caseOffset+i)) + fc.Indented(func() { + fc.translateStmtList(clause.Body) + if flatten && (i < len(caseClauses)-1 || defaultClause != nil) && !astutil.EndsWithReturn(clause.Body) { + fc.Printf("$s = %d; continue;", endCase) } }) prefix = "} else " } if defaultClause != nil { - c.PrintCond(!flatten, prefix+"{", fmt.Sprintf("case %d:", caseOffset+len(caseClauses))) - c.Indent(func() { - c.translateStmtList(defaultClause.Body) + fc.PrintCond(!flatten, prefix+"{", fmt.Sprintf("case %d:", caseOffset+len(caseClauses))) + fc.Indented(func() { + fc.translateStmtList(defaultClause.Body) }) } - c.PrintCond(!flatten, "}"+suffix, fmt.Sprintf("case %d:", endCase)) + fc.PrintCond(!flatten, "}"+suffix, fmt.Sprintf("case %d:", endCase)) } -func (c *funcContext) translateLoopingStmt(cond func() string, body *ast.BlockStmt, bodyPrefix, post func(), label *types.Label, flatten bool) { - prevFlowData := c.flowDatas[nil] +func (fc *funcContext) translateLoopingStmt(cond func() string, body *ast.BlockStmt, bodyPrefix, post func(), label *types.Label, flatten bool) { + prevFlowData := fc.flowDatas[nil] data := &flowData{ postStmt: post, } if flatten { - data.beginCase = c.caseCounter - data.endCase = c.caseCounter + 1 - c.caseCounter += 2 + data.beginCase = fc.caseCounter + data.endCase = fc.caseCounter + 1 + fc.caseCounter += 2 } - c.flowDatas[nil] = data - c.flowDatas[label] = data + fc.flowDatas[nil] = data + fc.flowDatas[label] = data defer func() { - delete(c.flowDatas, label) - c.flowDatas[nil] = prevFlowData + delete(fc.flowDatas, label) + fc.flowDatas[nil] = prevFlowData }() if !flatten && label != nil { - c.Printf("%s:", label.Name()) + fc.Printf("%s:", label.Name()) } - c.PrintCond(!flatten, "while (true) {", fmt.Sprintf("case %d:", data.beginCase)) - c.Indent(func() { + isTerminated := false + fc.PrintCond(!flatten, "while (true) {", fmt.Sprintf("case %d:", data.beginCase)) + fc.Indented(func() { condStr := cond() if condStr != "true" { - c.PrintCond(!flatten, fmt.Sprintf("if (!(%s)) { break; }", condStr), fmt.Sprintf("if(!(%s)) { $s = %d; continue; }", condStr, data.endCase)) + fc.PrintCond(!flatten, fmt.Sprintf("if (!(%s)) { break; }", condStr), fmt.Sprintf("if(!(%s)) { $s = %d; continue; }", condStr, data.endCase)) } - prevEV := c.p.escapingVars - c.handleEscapingVars(body) + prevEV := fc.pkgCtx.escapingVars + fc.handleEscapingVars(body) if bodyPrefix != nil { bodyPrefix() } - c.translateStmtList(body.List) - isTerminated := false + fc.translateStmtList(body.List) if len(body.List) != 0 { switch body.List[len(body.List)-1].(type) { case *ast.ReturnStmt, *ast.BranchStmt: @@ -651,31 +679,50 @@ func (c *funcContext) translateLoopingStmt(cond func() string, body *ast.BlockSt post() } - c.p.escapingVars = prevEV + fc.pkgCtx.escapingVars = prevEV }) - c.PrintCond(!flatten, "}", fmt.Sprintf("$s = %d; continue; case %d:", data.beginCase, data.endCase)) + if flatten { + // If the last statement of the loop is a return or unconditional branching + // statement, there's no need for an instruction to go back to the beginning + // of the loop. + if !isTerminated { + fc.Printf("$s = %d; continue;", data.beginCase) + } + fc.Printf("case %d:", data.endCase) + } else { + fc.Printf("}") + } } -func (c *funcContext) translateAssign(lhs, rhs ast.Expr, define bool) string { +func (fc *funcContext) translateAssign(lhs, rhs ast.Expr, define bool) string { lhs = astutil.RemoveParens(lhs) if isBlank(lhs) { panic("translateAssign with blank lhs") } if l, ok := lhs.(*ast.IndexExpr); ok { - if t, ok := c.p.TypeOf(l.X).Underlying().(*types.Map); ok { - if typesutil.IsJsObject(c.p.TypeOf(l.Index)) { - c.p.errList = append(c.p.errList, types.Error{Fset: c.p.fileSet, Pos: l.Index.Pos(), Msg: "cannot use js.Object as map key"}) - } - keyVar := c.newVariable("_key") - return fmt.Sprintf(`%s = %s; (%s || $throwRuntimeError("assignment to entry in nil map"))[%s.keyFor(%s)] = { k: %s, v: %s };`, keyVar, c.translateImplicitConversionWithCloning(l.Index, t.Key()), c.translateExpr(l.X), c.typeName(t.Key()), keyVar, keyVar, c.translateImplicitConversionWithCloning(rhs, t.Elem())) + if t, ok := fc.typeOf(l.X).Underlying().(*types.Map); ok { + if typesutil.IsJsObject(fc.typeOf(l.Index)) { + fc.pkgCtx.errList = append(fc.pkgCtx.errList, types.Error{Fset: fc.pkgCtx.fileSet, Pos: l.Index.Pos(), Msg: "cannot use js.Object as map key"}) + } + keyVar := fc.newLocalVariable("_key") + return fmt.Sprintf( + `%s = %s; (%s || $throwRuntimeError("assignment to entry in nil map")).set(%s.keyFor(%s), { k: %s, v: %s });`, + keyVar, + fc.translateImplicitConversionWithCloning(l.Index, t.Key()), + fc.translateExpr(l.X), + fc.typeName(t.Key()), + keyVar, + keyVar, + fc.translateImplicitConversionWithCloning(rhs, t.Elem()), + ) } } - lhsType := c.p.TypeOf(lhs) - rhsExpr := c.translateImplicitConversion(rhs, lhsType) + lhsType := fc.typeOf(lhs) + rhsExpr := fc.translateConversion(rhs, lhsType) if _, ok := rhs.(*ast.CompositeLit); ok && define { - return fmt.Sprintf("%s = %s;", c.translateExpr(lhs), rhsExpr) // skip $copy + return fmt.Sprintf("%s = %s;", fc.translateExpr(lhs), rhsExpr) // skip $copy } isReflectValue := false @@ -686,38 +733,38 @@ func (c *funcContext) translateAssign(lhs, rhs ast.Expr, define bool) string { switch lhsType.Underlying().(type) { case *types.Array, *types.Struct: if define { - return fmt.Sprintf("%s = $clone(%s, %s);", c.translateExpr(lhs), rhsExpr, c.typeName(lhsType)) + return fmt.Sprintf("%s = $clone(%s, %s);", fc.translateExpr(lhs), rhsExpr, fc.typeName(lhsType)) } - return fmt.Sprintf("%s.copy(%s, %s);", c.typeName(lhsType), c.translateExpr(lhs), rhsExpr) + return fmt.Sprintf("%s.copy(%s, %s);", fc.typeName(lhsType), fc.translateExpr(lhs), rhsExpr) } } switch l := lhs.(type) { case *ast.Ident: - return fmt.Sprintf("%s = %s;", c.objectName(c.p.ObjectOf(l)), rhsExpr) + return fmt.Sprintf("%s = %s;", fc.objectName(fc.pkgCtx.ObjectOf(l)), rhsExpr) case *ast.SelectorExpr: - sel, ok := c.p.SelectionOf(l) + sel, ok := fc.selectionOf(l) if !ok { // qualified identifier - return fmt.Sprintf("%s = %s;", c.objectName(c.p.Uses[l.Sel]), rhsExpr) + return fmt.Sprintf("%s = %s;", fc.objectName(fc.pkgCtx.Uses[l.Sel]), rhsExpr) } - fields, jsTag := c.translateSelection(sel, l.Pos()) + fields, jsTag := fc.translateSelection(sel, l.Pos()) if jsTag != "" { - return fmt.Sprintf("%s.%s%s = %s;", c.translateExpr(l.X), strings.Join(fields, "."), formatJSStructTagVal(jsTag), c.externalize(rhsExpr.String(), sel.Type())) + return fmt.Sprintf("%s.%s%s = %s;", fc.translateExpr(l.X), strings.Join(fields, "."), formatJSStructTagVal(jsTag), fc.externalize(rhsExpr.String(), sel.Type())) } - return fmt.Sprintf("%s.%s = %s;", c.translateExpr(l.X), strings.Join(fields, "."), rhsExpr) + return fmt.Sprintf("%s.%s = %s;", fc.translateExpr(l.X), strings.Join(fields, "."), rhsExpr) case *ast.StarExpr: - return fmt.Sprintf("%s.$set(%s);", c.translateExpr(l.X), rhsExpr) + return fmt.Sprintf("%s.$set(%s);", fc.translateExpr(l.X), rhsExpr) case *ast.IndexExpr: - switch t := c.p.TypeOf(l.X).Underlying().(type) { + switch t := fc.typeOf(l.X).Underlying().(type) { case *types.Array, *types.Pointer: - pattern := rangeCheck("%1e[%2f] = %3s", c.p.Types[l.Index].Value != nil, true) + pattern := rangeCheck("%1e[%2f] = %3s", fc.pkgCtx.Types[l.Index].Value != nil, true) if _, ok := t.(*types.Pointer); ok { // check pointer for nil (attribute getter causes a panic) pattern = `%1e.nilCheck, ` + pattern } - return c.formatExpr(pattern, l.X, l.Index, rhsExpr).String() + ";" + return fc.formatExpr(pattern, l.X, l.Index, rhsExpr).String() + ";" case *types.Slice: - return c.formatExpr(rangeCheck("%1e.$array[%1e.$offset + %2f] = %3s", c.p.Types[l.Index].Value != nil, false), l.X, l.Index, rhsExpr).String() + ";" + return fc.formatExpr(rangeCheck("%1e.$array[%1e.$offset + %2f] = %3s", fc.pkgCtx.Types[l.Index].Value != nil, false), l.X, l.Index, rhsExpr).String() + ";" default: panic(fmt.Sprintf("Unhandled lhs type: %T\n", t)) } @@ -726,61 +773,61 @@ func (c *funcContext) translateAssign(lhs, rhs ast.Expr, define bool) string { } } -func (c *funcContext) translateResults(results []ast.Expr) string { - tuple := c.sig.Results() +func (fc *funcContext) translateResults(results []ast.Expr) string { + tuple := fc.typeResolver.Substitute(fc.sig.Sig.Results()).(*types.Tuple) switch tuple.Len() { case 0: return "" case 1: - result := c.zeroValue(tuple.At(0).Type()) + result := fc.zeroValue(tuple.At(0).Type()) if results != nil { result = results[0] } - v := c.translateImplicitConversion(result, tuple.At(0).Type()) - c.delayedOutput = nil + v := fc.translateImplicitConversion(result, tuple.At(0).Type()) + fc.delayedOutput = nil return " " + v.String() default: if len(results) == 1 { - resultTuple := c.p.TypeOf(results[0]).(*types.Tuple) + resultTuple := fc.typeOf(results[0]).(*types.Tuple) if resultTuple.Len() != tuple.Len() { panic("invalid tuple return assignment") } - resultExpr := c.translateExpr(results[0]).String() + resultExpr := fc.translateExpr(results[0]).String() if types.Identical(resultTuple, tuple) { return " " + resultExpr } - tmpVar := c.newVariable("_returncast") - c.Printf("%s = %s;", tmpVar, resultExpr) + tmpVar := fc.newLocalVariable("_returncast") + fc.Printf("%s = %s;", tmpVar, resultExpr) // Not all the return types matched, map everything out for implicit casting results = make([]ast.Expr, resultTuple.Len()) for i := range results { - results[i] = c.newIdent(fmt.Sprintf("%s[%d]", tmpVar, i), resultTuple.At(i).Type()) + results[i] = fc.newIdent(fmt.Sprintf("%s[%d]", tmpVar, i), resultTuple.At(i).Type()) } } values := make([]string, tuple.Len()) for i := range values { - result := c.zeroValue(tuple.At(i).Type()) + result := fc.zeroValue(tuple.At(i).Type()) if results != nil { result = results[i] } - values[i] = c.translateImplicitConversion(result, tuple.At(i).Type()).String() + values[i] = fc.translateImplicitConversion(result, tuple.At(i).Type()).String() } - c.delayedOutput = nil + fc.delayedOutput = nil return " [" + strings.Join(values, ", ") + "]" } } -func (c *funcContext) labelCase(label *types.Label) int { - labelCase, ok := c.labelCases[label] +func (fc *funcContext) labelCase(label *types.Label) int { + labelCase, ok := fc.labelCases[label] if !ok { - labelCase = c.caseCounter - c.caseCounter++ - c.labelCases[label] = labelCase + labelCase = fc.caseCounter + fc.caseCounter++ + fc.labelCases[label] = labelCase } return labelCase } diff --git a/compiler/typesutil/map.go b/compiler/typesutil/map.go new file mode 100644 index 000000000..146f09765 --- /dev/null +++ b/compiler/typesutil/map.go @@ -0,0 +1,34 @@ +package typesutil + +import ( + "go/types" + + "golang.org/x/tools/go/types/typeutil" +) + +// Map is a type-safe wrapper around golang.org/x/tools/go/types/typeutil.Map. +type Map[Val any] struct{ impl typeutil.Map } + +func (m *Map[Val]) At(key types.Type) Val { + val := m.impl.At(key) + if val != nil { + return val.(Val) + } + var zero Val + return zero +} + +func (m *Map[Val]) Set(key types.Type, value Val) (prev Val) { + old := m.impl.Set(key, value) + if old != nil { + return old.(Val) + } + var zero Val + return zero +} + +func (m *Map[Val]) Delete(key types.Type) bool { return m.impl.Delete(key) } + +func (m *Map[Val]) Len() int { return m.impl.Len() } + +func (m *Map[Val]) String() string { return m.impl.String() } diff --git a/compiler/typesutil/signature.go b/compiler/typesutil/signature.go new file mode 100644 index 000000000..0a79432cb --- /dev/null +++ b/compiler/typesutil/signature.go @@ -0,0 +1,67 @@ +package typesutil + +import ( + "fmt" + "go/types" +) + +// Signature is a helper that provides convenient access to function +// signature type information. +type Signature struct { + Sig *types.Signature +} + +// RequiredParams returns the number of required parameters in the function signature. +func (st Signature) RequiredParams() int { + l := st.Sig.Params().Len() + if st.Sig.Variadic() { + return l - 1 // Last parameter is a slice of variadic params. + } + return l +} + +// VariadicType returns the slice-type corresponding to the signature's variadic +// parameter, or nil of the signature is not variadic. With the exception of +// the special-case `append([]byte{}, "string"...)`, the returned type is +// `*types.Slice` and `.Elem()` method can be used to get the type of individual +// arguments. +func (st Signature) VariadicType() types.Type { + if !st.Sig.Variadic() { + return nil + } + return st.Sig.Params().At(st.Sig.Params().Len() - 1).Type() +} + +// Param returns the expected argument type for the i'th argument position. +// +// This function is able to return correct expected types for variadic calls +// both when ellipsis syntax (e.g. myFunc(requiredArg, optionalArgSlice...)) +// is used and when optional args are passed individually. +// +// The returned types may differ from the actual argument expression types if +// there is an implicit type conversion involved (e.g. passing a struct into a +// function that expects an interface). +func (st Signature) Param(i int, ellipsis bool) types.Type { + if i < st.RequiredParams() { + return st.Sig.Params().At(i).Type() + } + if !st.Sig.Variadic() { + // This should never happen if the code was type-checked successfully. + panic(fmt.Errorf("tried to access parameter %d of a non-variadic signature %s", i, st.Sig)) + } + if ellipsis { + return st.VariadicType() + } + return st.VariadicType().(*types.Slice).Elem() +} + +// HasResults returns true if the function signature returns something. +func (st Signature) HasResults() bool { + return st.Sig.Results().Len() > 0 +} + +// HasNamedResults returns true if the function signature returns something and +// returned results are names (e.g. `func () (val int, err error)`). +func (st Signature) HasNamedResults() bool { + return st.HasResults() && st.Sig.Results().At(0).Name() != "" +} diff --git a/compiler/typesutil/signature_test.go b/compiler/typesutil/signature_test.go new file mode 100644 index 000000000..a6d159687 --- /dev/null +++ b/compiler/typesutil/signature_test.go @@ -0,0 +1,166 @@ +package typesutil + +import ( + "go/token" + "go/types" + "testing" +) + +func TestSignature_RequiredParams(t *testing.T) { + tests := []struct { + descr string + sig *types.Signature + want int + }{{ + descr: "regular signature", + sig: types.NewSignatureType(nil, nil, nil, types.NewTuple( + types.NewVar(token.NoPos, nil, "a", types.Typ[types.Int]), + types.NewVar(token.NoPos, nil, "b", types.Typ[types.String]), + types.NewVar(token.NoPos, nil, "c", types.NewSlice(types.Typ[types.String])), + ), nil, false), + want: 3, + }, { + descr: "variadic signature", + sig: types.NewSignatureType(nil, nil, nil, types.NewTuple( + types.NewVar(token.NoPos, nil, "a", types.Typ[types.Int]), + types.NewVar(token.NoPos, nil, "b", types.Typ[types.String]), + types.NewVar(token.NoPos, nil, "c", types.NewSlice(types.Typ[types.String])), + ), nil, true /*variadic*/), + want: 2, + }} + + for _, test := range tests { + t.Run(test.descr, func(t *testing.T) { + sig := Signature{Sig: test.sig} + got := sig.RequiredParams() + if got != test.want { + t.Errorf("Got: {%s}.RequiredParams() = %d. Want: %d.", test.sig, got, test.want) + } + }) + } +} + +func TestSignature_VariadicType(t *testing.T) { + tests := []struct { + descr string + sig *types.Signature + want types.Type + }{{ + descr: "regular signature", + sig: types.NewSignatureType(nil, nil, nil, types.NewTuple( + types.NewVar(token.NoPos, nil, "a", types.Typ[types.Int]), + types.NewVar(token.NoPos, nil, "b", types.Typ[types.String]), + types.NewVar(token.NoPos, nil, "c", types.NewSlice(types.Typ[types.String])), + ), nil, false), + want: nil, + }, { + descr: "variadic signature", + sig: types.NewSignatureType(nil, nil, nil, types.NewTuple( + types.NewVar(token.NoPos, nil, "a", types.Typ[types.Int]), + types.NewVar(token.NoPos, nil, "b", types.Typ[types.String]), + types.NewVar(token.NoPos, nil, "c", types.NewSlice(types.Typ[types.String])), + ), nil, true /*variadic*/), + want: types.NewSlice(types.Typ[types.String]), + }} + + for _, test := range tests { + t.Run(test.descr, func(t *testing.T) { + sig := Signature{Sig: test.sig} + got := sig.VariadicType() + if !types.Identical(got, test.want) { + t.Errorf("Got: {%s}.VariadicType() = %v. Want: %v.", test.sig, got, test.want) + } + }) + } +} + +func TestSignature_Param(t *testing.T) { + sig := types.NewSignatureType(nil, nil, nil, types.NewTuple( + types.NewVar(token.NoPos, nil, "a", types.Typ[types.Int]), + types.NewVar(token.NoPos, nil, "b", types.Typ[types.Byte]), + types.NewVar(token.NoPos, nil, "c", types.NewSlice(types.Typ[types.String])), + ), nil, true /*variadic*/) + + tests := []struct { + descr string + param int + ellipsis bool + want types.Type + }{{ + descr: "required param", + param: 1, + want: types.Typ[types.Byte], + }, { + descr: "variadic param", + param: 2, + want: types.Typ[types.String], + }, { + descr: "variadic param repeated", + param: 3, + want: types.Typ[types.String], + }, { + descr: "variadic param with ellipsis", + param: 2, + ellipsis: true, + want: types.NewSlice(types.Typ[types.String]), + }} + + for _, test := range tests { + t.Run(test.descr, func(t *testing.T) { + sig := Signature{Sig: sig} + got := sig.Param(test.param, test.ellipsis) + if !types.Identical(got, test.want) { + t.Errorf("Got: {%s}.Param(%v, %v) = %v. Want: %v.", sig, test.param, test.ellipsis, got, test.want) + } + }) + } +} + +func TestSignature_HasXResults(t *testing.T) { + tests := []struct { + descr string + sig *types.Signature + hasResults bool + hasNamedResults bool + }{{ + descr: "no results", + sig: types.NewSignatureType(nil, nil, nil, nil, types.NewTuple(), false), + hasResults: false, + hasNamedResults: false, + }, { + descr: "anonymous result", + sig: types.NewSignatureType(nil, nil, nil, nil, types.NewTuple( + types.NewVar(token.NoPos, nil, "", types.Typ[types.String]), + ), false), + hasResults: true, + hasNamedResults: false, + }, { + descr: "named result", + sig: types.NewSignatureType(nil, nil, nil, nil, types.NewTuple( + types.NewVar(token.NoPos, nil, "s", types.Typ[types.String]), + ), false), + hasResults: true, + hasNamedResults: true, + }, { + descr: "underscore named result", + sig: types.NewSignatureType(nil, nil, nil, nil, types.NewTuple( + types.NewVar(token.NoPos, nil, "_", types.Typ[types.String]), + ), false), + hasResults: true, + hasNamedResults: true, + }} + + for _, test := range tests { + t.Run(test.descr, func(t *testing.T) { + sig := Signature{Sig: test.sig} + gotHasResults := sig.HasResults() + if gotHasResults != test.hasResults { + t.Errorf("Got: {%s}.HasResults() = %v. Want: %v.", test.sig, gotHasResults, test.hasResults) + } + gotHasNamedResults := sig.HasNamedResults() + if gotHasNamedResults != test.hasNamedResults { + t.Errorf("Got: {%s}.HasResults() = %v. Want: %v.", test.sig, gotHasNamedResults, test.hasNamedResults) + } + }) + } +} diff --git a/compiler/typesutil/typelist.go b/compiler/typesutil/typelist.go new file mode 100644 index 000000000..768677365 --- /dev/null +++ b/compiler/typesutil/typelist.go @@ -0,0 +1,33 @@ +package typesutil + +import ( + "go/types" + "strings" +) + +// TypeList an ordered list of types. +type TypeList []types.Type + +func (tl TypeList) String() string { + buf := strings.Builder{} + for i, typ := range tl { + if i != 0 { + buf.WriteString(", ") + } + buf.WriteString(types.TypeString(typ, nil)) + } + return buf.String() +} + +// Equal returns true if both lists of type arguments are identical. +func (tl TypeList) Equal(other TypeList) bool { + if len(tl) != len(other) { + return false + } + for i := range tl { + if !types.Identical(tl[i], other[i]) { + return false + } + } + return true +} diff --git a/compiler/typesutil/typenames.go b/compiler/typesutil/typenames.go new file mode 100644 index 000000000..2f5ac6186 --- /dev/null +++ b/compiler/typesutil/typenames.go @@ -0,0 +1,30 @@ +package typesutil + +import "go/types" + +// TypeNames implements an ordered set of *types.TypeName pointers. +// +// The set is ordered to ensure deterministic behavior across compiler runs. +type TypeNames struct { + known map[*types.TypeName]struct{} + order []*types.TypeName +} + +// Add a type name to the set. If the type name has been previously added, +// this operation is a no-op. Two type names are considered equal iff they have +// the same memory address. +func (tn *TypeNames) Add(name *types.TypeName) { + if _, ok := tn.known[name]; ok { + return + } + if tn.known == nil { + tn.known = map[*types.TypeName]struct{}{} + } + tn.order = append(tn.order, name) + tn.known[name] = struct{}{} +} + +// Slice returns set elements in the order they were first added to the set. +func (tn *TypeNames) Slice() []*types.TypeName { + return tn.order +} diff --git a/compiler/typesutil/typenames_test.go b/compiler/typesutil/typenames_test.go new file mode 100644 index 000000000..1e8a4b994 --- /dev/null +++ b/compiler/typesutil/typenames_test.go @@ -0,0 +1,45 @@ +package typesutil + +import ( + "go/types" + "testing" + + "github.com/google/go-cmp/cmp" + "github.com/gopherjs/gopherjs/internal/srctesting" +) + +func typeNameOpts() cmp.Options { + return cmp.Options{ + cmp.Transformer("TypeName", func(name *types.TypeName) string { + return types.ObjectString(name, nil) + }), + } +} + +func TestTypeNames(t *testing.T) { + src := `package test + + type A int + type B int + type C int + ` + f := srctesting.New(t) + _, pkg := f.Check("pkg/test", f.Parse("test.go", src)) + A := srctesting.LookupObj(pkg, "A").(*types.TypeName) + B := srctesting.LookupObj(pkg, "B").(*types.TypeName) + C := srctesting.LookupObj(pkg, "C").(*types.TypeName) + + tn := TypeNames{} + tn.Add(A) + tn.Add(B) + tn.Add(A) + tn.Add(C) + tn.Add(B) + + got := tn.Slice() + want := []*types.TypeName{A, B, C} + + if diff := cmp.Diff(want, got, typeNameOpts()); diff != "" { + t.Errorf("tn.Slice() returned diff (-want,+got):\n%s", diff) + } +} diff --git a/compiler/typesutil/typesutil.go b/compiler/typesutil/typesutil.go index 600925b81..bce656f3b 100644 --- a/compiler/typesutil/typesutil.go +++ b/compiler/typesutil/typesutil.go @@ -1,6 +1,9 @@ package typesutil -import "go/types" +import ( + "fmt" + "go/types" +) func IsJsPackage(pkg *types.Package) bool { return pkg != nil && pkg.Path() == "github.com/gopherjs/gopherjs/js" @@ -14,3 +17,99 @@ func IsJsObject(t types.Type) bool { named, isNamed := ptr.Elem().(*types.Named) return isNamed && IsJsPackage(named.Obj().Pkg()) && named.Obj().Name() == "Object" } + +// RecvType returns a named type of a method receiver, or nil if it's not a method. +// +// For methods on a pointer receiver, the underlying named type is returned. +func RecvType(sig *types.Signature) *types.Named { + recv := sig.Recv() + if recv == nil { + return nil + } + + typ := recv.Type() + if ptrType, ok := typ.(*types.Pointer); ok { + typ = ptrType.Elem() + } + + return typ.(*types.Named) +} + +// RecvAsFirstArg takes a method signature and returns a function +// signature with receiver as the first parameter. +func RecvAsFirstArg(sig *types.Signature) *types.Signature { + params := make([]*types.Var, 0, 1+sig.Params().Len()) + params = append(params, sig.Recv()) + for i := 0; i < sig.Params().Len(); i++ { + params = append(params, sig.Params().At(i)) + } + return types.NewSignatureType(nil, nil, nil, types.NewTuple(params...), sig.Results(), sig.Variadic()) +} + +// Selection is a common interface for go/types.Selection and our custom-constructed +// method and field selections. +type Selection interface { + Kind() types.SelectionKind + Recv() types.Type + Index() []int + Obj() types.Object + Type() types.Type +} + +// NewSelection creates a new selection. +func NewSelection(kind types.SelectionKind, recv types.Type, index []int, obj types.Object, typ types.Type) Selection { + return &selectionImpl{ + kind: kind, + recv: recv, + index: index, + obj: obj, + typ: typ, + } +} + +type selectionImpl struct { + kind types.SelectionKind + recv types.Type + index []int + obj types.Object + typ types.Type +} + +func (sel *selectionImpl) Kind() types.SelectionKind { return sel.kind } +func (sel *selectionImpl) Recv() types.Type { return sel.recv } +func (sel *selectionImpl) Index() []int { return sel.index } +func (sel *selectionImpl) Obj() types.Object { return sel.obj } +func (sel *selectionImpl) Type() types.Type { return sel.typ } + +func fieldsOf(s *types.Struct) []*types.Var { + fields := make([]*types.Var, s.NumFields()) + for i := 0; i < s.NumFields(); i++ { + fields[i] = s.Field(i) + } + return fields +} + +// OffsetOf returns byte offset of a struct field specified by the provided +// selection. +// +// Adapted from go/types.Config.offsetof(). +func OffsetOf(sizes types.Sizes, sel Selection) int64 { + if sel.Kind() != types.FieldVal { + panic(fmt.Errorf("byte offsets are only defined for struct fields")) + } + typ := sel.Recv() + var o int64 + for _, idx := range sel.Index() { + s := typ.Underlying().(*types.Struct) + o += sizes.Offsetsof(fieldsOf(s))[idx] + typ = s.Field(idx).Type() + } + + return o +} + +// IsMethod returns true if the passed object is a method. +func IsMethod(o types.Object) bool { + f, ok := o.(*types.Func) + return ok && f.Type().(*types.Signature).Recv() != nil +} diff --git a/compiler/utils.go b/compiler/utils.go index d5452e0a6..7d286f447 100644 --- a/compiler/utils.go +++ b/compiler/utils.go @@ -3,135 +3,194 @@ package compiler import ( "bytes" "encoding/binary" + "errors" "fmt" "go/ast" "go/constant" "go/token" "go/types" "net/url" + "regexp" + "runtime/debug" "sort" "strconv" "strings" "text/template" "unicode" - "github.com/gopherjs/gopherjs/compiler/analysis" + "github.com/gopherjs/gopherjs/compiler/internal/analysis" + "github.com/gopherjs/gopherjs/compiler/internal/typeparams" "github.com/gopherjs/gopherjs/compiler/typesutil" ) -func (c *funcContext) Write(b []byte) (int, error) { - c.writePos() - c.output = append(c.output, b...) +// We use this character as a separator in synthetic identifiers instead of a +// regular dot. This character is safe for use in JS identifiers and helps to +// visually separate components of the name when it appears in a stack trace. +const midDot = "·" + +// root returns the topmost function context corresponding to the package scope. +func (fc *funcContext) root() *funcContext { + if fc.isRoot() { + return fc + } + return fc.parent.root() +} + +// isRoot returns true for the package-level context. +func (fc *funcContext) isRoot() bool { + return fc.parent == nil +} + +func (fc *funcContext) Write(b []byte) (int, error) { + fc.writePos() + fc.output = append(fc.output, b...) return len(b), nil } -func (c *funcContext) Printf(format string, values ...interface{}) { - c.Write([]byte(strings.Repeat("\t", c.p.indentation))) - fmt.Fprintf(c, format, values...) - c.Write([]byte{'\n'}) - c.Write(c.delayedOutput) - c.delayedOutput = nil +func (fc *funcContext) Printf(format string, values ...interface{}) { + fc.Write([]byte(fc.Indentation(0))) + fmt.Fprintf(fc, format, values...) + fc.Write([]byte{'\n'}) + fc.Write(fc.delayedOutput) + fc.delayedOutput = nil } -func (c *funcContext) PrintCond(cond bool, onTrue, onFalse string) { +func (fc *funcContext) PrintCond(cond bool, onTrue, onFalse string) { if !cond { - c.Printf("/* %s */ %s", strings.Replace(onTrue, "*/", "/", -1), onFalse) + fc.Printf("/* %s */ %s", strings.Replace(onTrue, "*/", "/", -1), onFalse) return } - c.Printf("%s", onTrue) + fc.Printf("%s", onTrue) } -func (c *funcContext) SetPos(pos token.Pos) { - c.posAvailable = true - c.pos = pos +func (fc *funcContext) SetPos(pos token.Pos) { + fc.posAvailable = true + fc.pos = pos } -func (c *funcContext) writePos() { - if c.posAvailable { - c.posAvailable = false - c.Write([]byte{'\b'}) - binary.Write(c, binary.BigEndian, uint32(c.pos)) +func (fc *funcContext) writePos() { + if fc.posAvailable { + fc.posAvailable = false + fc.Write([]byte{'\b'}) + binary.Write(fc, binary.BigEndian, uint32(fc.pos)) } } -func (c *funcContext) Indent(f func()) { - c.p.indentation++ +// Indented increases generated code indentation level by 1 for the code emitted +// from the callback f. +func (fc *funcContext) Indented(f func()) { + fc.pkgCtx.indentation++ f() - c.p.indentation-- + fc.pkgCtx.indentation-- +} + +// Indentation returns a sequence of "\t" characters appropriate to the current +// generated code indentation level. The `extra` parameter provides relative +// indentation adjustment. +func (fc *funcContext) Indentation(extra int) string { + return strings.Repeat("\t", fc.pkgCtx.indentation+extra) } -func (c *funcContext) CatchOutput(indent int, f func()) []byte { - origoutput := c.output - c.output = nil - c.p.indentation += indent +func (fc *funcContext) CatchOutput(indent int, f func()) []byte { + origoutput := fc.output + fc.output = nil + fc.pkgCtx.indentation += indent f() - c.writePos() - catched := c.output - c.output = origoutput - c.p.indentation -= indent - return catched + fc.writePos() + caught := fc.output + fc.output = origoutput + fc.pkgCtx.indentation -= indent + return caught } -func (c *funcContext) Delayed(f func()) { - c.delayedOutput = c.CatchOutput(0, f) +func (fc *funcContext) Delayed(f func()) { + fc.delayedOutput = fc.CatchOutput(0, f) } -func (c *funcContext) translateArgs(sig *types.Signature, argExprs []ast.Expr, ellipsis bool) []string { - if len(argExprs) == 1 { - if tuple, isTuple := c.p.TypeOf(argExprs[0]).(*types.Tuple); isTuple { - tupleVar := c.newVariable("_tuple") - c.Printf("%s = %s;", tupleVar, c.translateExpr(argExprs[0])) - argExprs = make([]ast.Expr, tuple.Len()) - for i := range argExprs { - argExprs[i] = c.newIdent(c.formatExpr("%s[%d]", tupleVar, i).String(), tuple.At(i).Type()) - } - } +// expandTupleArgs converts a function call which argument is a tuple returned +// by another function into a set of individual call arguments corresponding to +// tuple elements. +// +// For example, for functions defined as: +// +// func a() (int, string) {return 42, "foo"} +// func b(a1 int, a2 string) {} +// +// ...the following statement: +// +// b(a()) +// +// ...will be transformed into: +// +// _tuple := a() +// b(_tuple[0], _tuple[1]) +func (fc *funcContext) expandTupleArgs(argExprs []ast.Expr) []ast.Expr { + if len(argExprs) != 1 { + return argExprs } - paramsLen := sig.Params().Len() + tuple, isTuple := fc.typeOf(argExprs[0]).(*types.Tuple) + if !isTuple { + return argExprs + } - var varargType *types.Slice - if sig.Variadic() && !ellipsis { - varargType = sig.Params().At(paramsLen - 1).Type().(*types.Slice) + tupleVar := fc.newLocalVariable("_tuple") + fc.Printf("%s = %s;", tupleVar, fc.translateExpr(argExprs[0])) + argExprs = make([]ast.Expr, tuple.Len()) + for i := range argExprs { + argExprs[i] = fc.newIdent(fc.formatExpr("%s[%d]", tupleVar, i).String(), tuple.At(i).Type()) + } + return argExprs +} + +func (fc *funcContext) translateArgs(sig *types.Signature, argExprs []ast.Expr, ellipsis bool) []string { + argExprs = fc.expandTupleArgs(argExprs) + + sigTypes := typesutil.Signature{Sig: sig} + + if sig.Variadic() && len(argExprs) == 0 { + return []string{fmt.Sprintf("%s.nil", fc.typeName(sigTypes.VariadicType()))} } preserveOrder := false for i := 1; i < len(argExprs); i++ { - preserveOrder = preserveOrder || c.Blocking[argExprs[i]] + preserveOrder = preserveOrder || fc.Blocking[argExprs[i]] } args := make([]string, len(argExprs)) for i, argExpr := range argExprs { - var argType types.Type - switch { - case varargType != nil && i >= paramsLen-1: - argType = varargType.Elem() - default: - argType = sig.Params().At(i).Type() - } + arg := fc.translateImplicitConversionWithCloning(argExpr, sigTypes.Param(i, ellipsis)).String() - arg := c.translateImplicitConversionWithCloning(argExpr, argType).String() - - if preserveOrder && c.p.Types[argExpr].Value == nil { - argVar := c.newVariable("_arg") - c.Printf("%s = %s;", argVar, arg) + if preserveOrder && fc.pkgCtx.Types[argExpr].Value == nil { + argVar := fc.newLocalVariable("_arg") + fc.Printf("%s = %s;", argVar, arg) arg = argVar } args[i] = arg } - if varargType != nil { - return append(args[:paramsLen-1], fmt.Sprintf("new %s([%s])", c.typeName(varargType), strings.Join(args[paramsLen-1:], ", "))) + // If variadic arguments were passed in as individual elements, regroup them + // into a slice and pass it as a single argument. + if sig.Variadic() && !ellipsis { + required := args[:sigTypes.RequiredParams()] + var variadic string + if len(args) == sigTypes.RequiredParams() { + // If no variadic parameters were passed, the slice value defaults to nil. + variadic = fmt.Sprintf("%s.nil", fc.typeName(sigTypes.VariadicType())) + } else { + variadic = fmt.Sprintf("new %s([%s])", fc.typeName(sigTypes.VariadicType()), strings.Join(args[sigTypes.RequiredParams():], ", ")) + } + return append(required, variadic) } return args } -func (c *funcContext) translateSelection(sel selection, pos token.Pos) ([]string, string) { +func (fc *funcContext) translateSelection(sel typesutil.Selection, pos token.Pos) ([]string, string) { var fields []string t := sel.Recv() for _, index := range sel.Index() { - if ptr, isPtr := t.(*types.Pointer); isPtr { + if ptr, isPtr := t.Underlying().(*types.Pointer); isPtr { t = ptr.Elem() } s := t.Underlying().(*types.Struct) @@ -139,7 +198,7 @@ func (c *funcContext) translateSelection(sel selection, pos token.Pos) ([]string jsFieldName := s.Field(index).Name() for { fields = append(fields, fieldName(s, 0)) - ft := s.Field(0).Type() + ft := fc.fieldType(s, 0) if typesutil.IsJsObject(ft) { return fields, jsTag } @@ -150,29 +209,29 @@ func (c *funcContext) translateSelection(sel selection, pos token.Pos) ([]string var ok bool s, ok = ft.(*types.Struct) if !ok || s.NumFields() == 0 { - c.p.errList = append(c.p.errList, types.Error{Fset: c.p.fileSet, Pos: pos, Msg: fmt.Sprintf("could not find field with type *js.Object for 'js' tag of field '%s'", jsFieldName), Soft: true}) + fc.pkgCtx.errList = append(fc.pkgCtx.errList, types.Error{Fset: fc.pkgCtx.fileSet, Pos: pos, Msg: fmt.Sprintf("could not find field with type *js.Object for 'js' tag of field '%s'", jsFieldName), Soft: true}) return nil, "" } } } fields = append(fields, fieldName(s, index)) - t = s.Field(index).Type() + t = fc.fieldType(s, index) } return fields, "" } var nilObj = types.Universe.Lookup("nil") -func (c *funcContext) zeroValue(ty types.Type) ast.Expr { +func (fc *funcContext) zeroValue(ty types.Type) ast.Expr { switch t := ty.Underlying().(type) { case *types.Basic: switch { case isBoolean(t): - return c.newConst(ty, constant.MakeBool(false)) + return fc.newConst(ty, constant.MakeBool(false)) case isNumeric(t): - return c.newConst(ty, constant.MakeInt64(0)) + return fc.newConst(ty, constant.MakeInt64(0)) case isString(t): - return c.newConst(ty, constant.MakeString("")) + return fc.newConst(ty, constant.MakeString("")) case t.Kind() == types.UnsafePointer: // fall through to "nil" case t.Kind() == types.UntypedNil: @@ -181,33 +240,48 @@ func (c *funcContext) zeroValue(ty types.Type) ast.Expr { panic(fmt.Sprintf("Unhandled basic type: %v\n", t)) } case *types.Array, *types.Struct: - return c.setType(&ast.CompositeLit{}, ty) + return fc.setType(&ast.CompositeLit{}, ty) case *types.Chan, *types.Interface, *types.Map, *types.Signature, *types.Slice, *types.Pointer: // fall through to "nil" default: panic(fmt.Sprintf("Unhandled type: %T\n", t)) } - id := c.newIdent("nil", ty) - c.p.Uses[id] = nilObj + id := fc.newIdent("nil", ty) + fc.pkgCtx.Uses[id] = nilObj return id } -func (c *funcContext) newConst(t types.Type, value constant.Value) ast.Expr { +func (fc *funcContext) newConst(t types.Type, value constant.Value) ast.Expr { id := &ast.Ident{} - c.p.Types[id] = types.TypeAndValue{Type: t, Value: value} + fc.pkgCtx.Types[id] = types.TypeAndValue{Type: t, Value: value} return id } -func (c *funcContext) newVariable(name string) string { - return c.newVariableWithLevel(name, false) +// newLocalVariable assigns a new JavaScript variable name for the given Go +// local variable name. In this context "local" means "in scope of the current" +// functionContext. +func (fc *funcContext) newLocalVariable(name string) string { + return fc.newVariable(name, false) } -func (c *funcContext) newVariableWithLevel(name string, pkgLevel bool) string { +// newVariable assigns a new JavaScript variable name for the given Go variable +// or type. +// +// If there is already a variable with the same name visible in the current +// function context (e.g. due to shadowing), the returned name will be suffixed +// with a number to prevent conflict. This is necessary because Go name +// resolution scopes differ from var declarations in JS. +// +// If pkgLevel is true, the variable is declared at the package level and added +// to this functionContext, as well as all parents, but not to the list of local +// variables. If false, it is added to this context only, as well as the list of +// local vars. +func (fc *funcContext) newVariable(name string, pkgLevel bool) string { if name == "" { panic("newVariable: empty name") } name = encodeIdent(name) - if c.p.minify { + if fc.pkgCtx.minify { i := 0 for { offset := int('a') @@ -217,56 +291,89 @@ func (c *funcContext) newVariableWithLevel(name string, pkgLevel bool) string { j := i name = "" for { - name = string(offset+(j%26)) + name + name = string(rune(offset+(j%26))) + name j = j/26 - 1 if j == -1 { break } } - if c.allVars[name] == 0 { + if fc.allVars[name] == 0 { break } i++ } } - n := c.allVars[name] - c.allVars[name] = n + 1 + n := fc.allVars[name] + fc.allVars[name] = n + 1 varName := name if n > 0 { varName = fmt.Sprintf("%s$%d", name, n) } if pkgLevel { - for c2 := c.parent; c2 != nil; c2 = c2.parent { + for c2 := fc.parent; c2 != nil; c2 = c2.parent { c2.allVars[name] = n + 1 } return varName } - c.localVars = append(c.localVars, varName) + fc.localVars = append(fc.localVars, varName) return varName } -func (c *funcContext) newIdent(name string, t types.Type) *ast.Ident { +// newIdent declares a new Go variable with the given name and type and returns +// an *ast.Ident referring to that object. +func (fc *funcContext) newIdent(name string, t types.Type) *ast.Ident { + obj := types.NewVar(0, fc.pkgCtx.Pkg, name, t) + fc.objectNames[obj] = name + return fc.newIdentFor(obj) +} + +// newIdentFor creates a new *ast.Ident referring to the given Go object. +func (fc *funcContext) newIdentFor(obj types.Object) *ast.Ident { + ident := ast.NewIdent(obj.Name()) + ident.NamePos = obj.Pos() + fc.pkgCtx.Uses[ident] = obj + fc.setType(ident, obj.Type()) + return ident +} + +func (fc *funcContext) newTypeIdent(name string, obj types.Object) *ast.Ident { ident := ast.NewIdent(name) - c.setType(ident, t) - obj := types.NewVar(0, c.p.Pkg, name, t) - c.p.Uses[ident] = obj - c.p.objectNames[obj] = name + fc.pkgCtx.Info.Uses[ident] = obj return ident } -func (c *funcContext) setType(e ast.Expr, t types.Type) ast.Expr { - c.p.Types[e] = types.TypeAndValue{Type: t} +// newLitFuncName generates a new synthetic name for a function literal. +func (fc *funcContext) newLitFuncName() string { + fc.funcLitCounter++ + name := &strings.Builder{} + + // If function literal is defined inside another function, qualify its + // synthetic name with the outer function to make it easier to identify. + if fc.instance.Object != nil { + if recvType := typesutil.RecvType(fc.sig.Sig); recvType != nil { + name.WriteString(recvType.Obj().Name()) + name.WriteString(midDot) + } + name.WriteString(fc.instance.Object.Name()) + name.WriteString(midDot) + } + fmt.Fprintf(name, "func%d", fc.funcLitCounter) + return name.String() +} + +func (fc *funcContext) setType(e ast.Expr, t types.Type) ast.Expr { + fc.pkgCtx.Types[e] = types.TypeAndValue{Type: t} return e } -func (c *funcContext) pkgVar(pkg *types.Package) string { - if pkg == c.p.Pkg { +func (fc *funcContext) pkgVar(pkg *types.Package) string { + if pkg == fc.pkgCtx.Pkg { return "$pkg" } - pkgVar, found := c.p.pkgVars[pkg.Path()] + pkgVar, found := fc.pkgCtx.pkgVars[pkg.Path()] if !found { pkgVar = fmt.Sprintf(`$packages["%s"]`, pkg.Path()) } @@ -282,44 +389,117 @@ func isVarOrConst(o types.Object) bool { } func isPkgLevel(o types.Object) bool { - return o.Parent() != nil && o.Parent().Parent() == types.Universe + // Note: named types are always assigned a variable at package level to be + // initialized with the rest of the package types, even the types declared + // in a statement inside a function. + _, isType := o.(*types.TypeName) + return (o.Parent() != nil && o.Parent().Parent() == types.Universe) || isType +} + +// assignedObjectName checks if the object has been previously assigned a name +// in this or one of the parent contexts. If not, found will be false. +func (fc *funcContext) assignedObjectName(o types.Object) (name string, found bool) { + if fc == nil { + return "", false + } + if name, found := fc.parent.assignedObjectName(o); found { + return name, true + } + + name, found = fc.objectNames[o] + return name, found } -func (c *funcContext) objectName(o types.Object) string { +// objectName returns a JS expression that refers to the given object. If the +// object hasn't been previously assigned a JS variable name, it will be +// allocated as needed. +func (fc *funcContext) objectName(o types.Object) string { if isPkgLevel(o) { - c.p.dependencies[o] = true + fc.pkgCtx.DeclareDCEDep(o) - if o.Pkg() != c.p.Pkg || (isVarOrConst(o) && o.Exported()) { - return c.pkgVar(o.Pkg()) + "." + o.Name() + if o.Pkg() != fc.pkgCtx.Pkg || (isVarOrConst(o) && o.Exported()) { + return fc.pkgVar(o.Pkg()) + "." + o.Name() } } - name, ok := c.p.objectNames[o] + name, ok := fc.assignedObjectName(o) if !ok { - name = c.newVariableWithLevel(o.Name(), isPkgLevel(o)) - c.p.objectNames[o] = name + pkgLevel := isPkgLevel(o) + name = fc.newVariable(o.Name(), pkgLevel) + if pkgLevel { + fc.root().objectNames[o] = name + } else { + fc.objectNames[o] = name + } } - if v, ok := o.(*types.Var); ok && c.p.escapingVars[v] { + if v, ok := o.(*types.Var); ok && fc.pkgCtx.escapingVars[v] { return name + "[0]" } return name } -func (c *funcContext) varPtrName(o *types.Var) string { +// knownInstances returns a list of known instantiations of the object. +// +// For objects without type params and not nested in a generic function or +// method, this always returns a single trivial instance. +// If the object is generic, or in a generic function or method, but there are +// no instances, then the object is unused and an empty list is returned. +func (fc *funcContext) knownInstances(o types.Object) []typeparams.Instance { + instances := fc.pkgCtx.instanceSet.Pkg(o.Pkg()).ForObj(o) + if len(instances) == 0 && !typeparams.HasTypeParams(o.Type()) { + return []typeparams.Instance{{Object: o}} + } + return instances +} + +// instName returns a JS expression that refers to the provided instance of a +// function or type. Non-generic objects may be represented as an instance with +// zero type arguments. +func (fc *funcContext) instName(inst typeparams.Instance) string { + objName := fc.objectName(inst.Object) + if inst.IsTrivial() { + return objName + } + fc.pkgCtx.DeclareDCEDep(inst.Object, inst.TArgs...) + label := inst.TypeParamsString(` /* `, ` */`) + return fmt.Sprintf("%s[%d%s]", objName, fc.pkgCtx.instanceSet.ID(inst), label) +} + +// methodName returns a JS identifier (specifically, object property name) +// corresponding to the given method. +func (fc *funcContext) methodName(fun *types.Func) string { + if fun.Type().(*types.Signature).Recv() == nil { + panic(fmt.Errorf("expected a method, got a standalone function %v", fun)) + } + name := fun.Name() + // Method names are scoped to their receiver type and guaranteed to be + // unique within that, so we only need to make sure it's not a reserved keyword + if reservedKeywords[name] { + name += "$" + } + return name +} + +func (fc *funcContext) varPtrName(o *types.Var) string { if isPkgLevel(o) && o.Exported() { - return c.pkgVar(o.Pkg()) + "." + o.Name() + "$ptr" + return fc.pkgVar(o.Pkg()) + "." + o.Name() + "$ptr" } - name, ok := c.p.varPtrNames[o] + name, ok := fc.pkgCtx.varPtrNames[o] if !ok { - name = c.newVariableWithLevel(o.Name()+"$ptr", isPkgLevel(o)) - c.p.varPtrNames[o] = name + name = fc.newVariable(o.Name()+"$ptr", isPkgLevel(o)) + fc.pkgCtx.varPtrNames[o] = name } return name } -func (c *funcContext) typeName(ty types.Type) string { +// typeName returns a JS identifier name for the given Go type. +// +// For the built-in types it returns identifiers declared in the prelude. For +// all user-defined or composite types it creates a unique JS identifier and +// will return it on all subsequent calls for the type. +func (fc *funcContext) typeName(ty types.Type) string { switch t := ty.(type) { case *types.Basic: return "$" + toJavaScriptType(t) @@ -327,26 +507,112 @@ func (c *funcContext) typeName(ty types.Type) string { if t.Obj().Name() == "error" { return "$error" } - return c.objectName(t.Obj()) + inst := typeparams.Instance{Object: t.Obj()} + + // Get type arguments for the type if there are any. + for i := 0; i < t.TypeArgs().Len(); i++ { + inst.TArgs = append(inst.TArgs, t.TypeArgs().At(i)) + } + + // Get the nesting type arguments if there are any. + if fn := typeparams.FindNestingFunc(t.Obj()); fn != nil { + if fn.Scope().Contains(t.Obj().Pos()) { + tp := typeparams.SignatureTypeParams(fn.Type().(*types.Signature)) + tNest := make([]types.Type, tp.Len()) + for i := 0; i < tp.Len(); i++ { + tNest[i] = fc.typeResolver.Substitute(tp.At(i)) + } + inst.TNest = typesutil.TypeList(tNest) + } + } + + return fc.instName(inst) case *types.Interface: if t.Empty() { return "$emptyInterface" } + case *types.TypeParam: + panic(fmt.Errorf("unexpected type parameter: %v", t)) } - anonType, ok := c.p.anonTypeMap.At(ty).(*types.TypeName) + // For anonymous composite types, generate a synthetic package-level type + // declaration, which will be reused for all instances of this type. This + // improves performance, since runtime won't have to synthesize the same type + // repeatedly. + anonType, ok := fc.pkgCtx.anonTypeMap.At(ty).(*types.TypeName) if !ok { - c.initArgs(ty) // cause all embedded types to be registered - varName := c.newVariableWithLevel(strings.ToLower(typeKind(ty)[5:])+"Type", true) - anonType = types.NewTypeName(token.NoPos, c.p.Pkg, varName, ty) // fake types.TypeName - c.p.anonTypes = append(c.p.anonTypes, anonType) - c.p.anonTypeMap.Set(ty, anonType) + fc.initArgs(ty) // cause all embedded types to be registered + varName := fc.newVariable(strings.ToLower(typeKind(ty)[5:])+"Type", true) + anonType = types.NewTypeName(token.NoPos, fc.pkgCtx.Pkg, varName, ty) // fake types.TypeName + fc.pkgCtx.anonTypes = append(fc.pkgCtx.anonTypes, anonType) + fc.pkgCtx.anonTypeMap.Set(ty, anonType) } - c.p.dependencies[anonType] = true + fc.pkgCtx.DeclareDCEDep(anonType) return anonType.Name() } -func (c *funcContext) externalize(s string, t types.Type) string { +// importedPkgVar returns a package-level variable name for accessing an imported +// package. +// +// Allocates a new variable if this is the first call, or returns the existing +// one. The variable is based on the package name (implicitly derived from the +// `package` declaration in the imported package, or explicitly assigned by the +// import decl in the importing source file). +// +// Returns the allocated variable name. +func (fc *funcContext) importedPkgVar(pkg *types.Package) string { + if pkgVar, ok := fc.pkgCtx.pkgVars[pkg.Path()]; ok { + return pkgVar // Already registered. + } + + pkgVar := fc.newVariable(pkg.Name(), true) + fc.pkgCtx.pkgVars[pkg.Path()] = pkgVar + return pkgVar +} + +// instanceOf constructs an instance description of the object the ident is +// referring to. For non-generic objects, it will return a trivial instance with +// no type arguments. +func (fc *funcContext) instanceOf(ident *ast.Ident) typeparams.Instance { + inst := typeparams.Instance{Object: fc.pkgCtx.ObjectOf(ident)} + if i, ok := fc.pkgCtx.Instances[ident]; ok { + inst.TArgs = fc.typeResolver.SubstituteAll(i.TypeArgs) + } + return inst +} + +// typeOf returns a type associated with the given AST expression. For types +// defined in terms of type parameters, it will substitute type parameters with +// concrete types from the current set of type arguments. +func (fc *funcContext) typeOf(expr ast.Expr) types.Type { + typ := fc.pkgCtx.TypeOf(expr) + // If the expression is referring to an instance of a generic type or function, + // we want the instantiated type. + if ident, ok := expr.(*ast.Ident); ok { + if inst, ok := fc.pkgCtx.Instances[ident]; ok { + typ = inst.Type + } + } + return fc.typeResolver.Substitute(typ) +} + +// fieldType returns the type of the i-th field of the given struct +// after substituting type parameters with concrete types for nested context. +func (fc *funcContext) fieldType(t *types.Struct, i int) types.Type { + return fc.typeResolver.Substitute(t.Field(i).Type()) +} + +func (fc *funcContext) selectionOf(e *ast.SelectorExpr) (typesutil.Selection, bool) { + if sel, ok := fc.pkgCtx.Selections[e]; ok { + return fc.typeResolver.SubstituteSelection(sel), true + } + if sel, ok := fc.pkgCtx.additionalSelections[e]; ok { + return sel, true + } + return nil, false +} + +func (fc *funcContext) externalize(s string, t types.Type) string { if typesutil.IsJsObject(t) { return s } @@ -359,31 +625,25 @@ func (c *funcContext) externalize(s string, t types.Type) string { return "null" } } - return fmt.Sprintf("$externalize(%s, %s)", s, c.typeName(t)) + return fmt.Sprintf("$externalize(%s, %s)", s, fc.typeName(t)) } -func (c *funcContext) handleEscapingVars(n ast.Node) { +func (fc *funcContext) handleEscapingVars(n ast.Node) { newEscapingVars := make(map[*types.Var]bool) - for escaping := range c.p.escapingVars { + for escaping := range fc.pkgCtx.escapingVars { newEscapingVars[escaping] = true } - c.p.escapingVars = newEscapingVars + fc.pkgCtx.escapingVars = newEscapingVars var names []string - objs := analysis.EscapingObjects(n, c.p.Info.Info) - sort.Slice(objs, func(i, j int) bool { - if objs[i].Name() == objs[j].Name() { - return objs[i].Pos() < objs[j].Pos() - } - return objs[i].Name() < objs[j].Name() - }) + objs := analysis.EscapingObjects(n, fc.pkgCtx.Info.Info) for _, obj := range objs { - names = append(names, c.objectName(obj)) - c.p.escapingVars[obj] = true + names = append(names, fc.objectName(obj)) + fc.pkgCtx.escapingVars[obj] = true } sort.Strings(names) for _, name := range names { - c.Printf("%s = [%s];", name, name) + fc.Printf("%s = [%s];", name, name) } } @@ -478,6 +738,36 @@ func isBlank(expr ast.Expr) bool { return false } +// isWrapped returns true for types that may need to be boxed to access full +// functionality of the Go type. +// +// For efficiency or interoperability reasons certain Go types can be represented +// by JavaScript values that weren't constructed by the corresponding Go type +// constructor. +// +// For example, consider a Go type: +// +// type SecretInt int +// func (_ SecretInt) String() string { return "" } +// +// func main() { +// var i SecretInt = 1 +// println(i.String()) +// } +// +// For this example the compiler will generate code similar to the snippet below: +// +// SecretInt = $pkg.SecretInt = $newType(4, $kindInt, "main.SecretInt", true, "main", true, null); +// SecretInt.prototype.String = function() { +// return ""; +// }; +// main = function() { +// var i = 1; +// console.log(new SecretInt(i).String()); +// }; +// +// Note that the generated code assigns a primitive "number" value into i, and +// only boxes it into an object when it's necessary to access its methods. func isWrapped(ty types.Type) bool { switch t := ty.Underlying().(type) { case *types.Basic: @@ -633,17 +923,16 @@ func rangeCheck(pattern string, constantIndex, array bool) string { return "(" + check + ` ? ($throwRuntimeError("index out of range"), undefined) : ` + pattern + ")" } -func endsWithReturn(stmts []ast.Stmt) bool { - if len(stmts) > 0 { - if _, ok := stmts[len(stmts)-1].(*ast.ReturnStmt); ok { - return true - } - } - return false -} - func encodeIdent(name string) string { - return strings.Replace(url.QueryEscape(name), "%", "$", -1) + // Quick-and-dirty way to make any string safe for use as an identifier in JS. + name = url.QueryEscape(name) + // We use unicode middle dot as a visual separator in synthetic identifiers. + // It is safe for use in a JS identifier, so we un-encode it for readability. + name = strings.ReplaceAll(name, "%C2%B7", midDot) + // QueryEscape uses '%' before hex-codes of escaped characters, which is not + // allowed in a JS identifier, use '$' instead. + name = strings.ReplaceAll(name, "%", "$") + return name } // formatJSStructTagVal returns JavaScript code for accessing an object's property @@ -652,13 +941,12 @@ func encodeIdent(name string) string { // // For example: // -// "my_name" -> ".my_name" -// "my name" -> `["my name"]` +// "my_name" -> ".my_name" +// "my name" -> `["my name"]` // // For more information about JavaScript property accessors and identifiers, see // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_Accessors and // https://developer.mozilla.org/en-US/docs/Glossary/Identifier. -// func formatJSStructTagVal(jsTag string) string { for i, r := range jsTag { ok := unicode.IsLetter(r) || (i != 0 && unicode.IsNumber(r)) || r == '$' || r == '_' @@ -671,3 +959,67 @@ func formatJSStructTagVal(jsTag string) string { // Safe to use dot notation without any escaping. return "." + jsTag } + +// FatalError is an error compiler panics with when it encountered a fatal error. +// +// FatalError implements io.Writer, which can be used to record any free-form +// debugging details for human consumption. This information will be included +// into String() result along with the rest. +type FatalError struct { + cause interface{} + stack []byte + clues strings.Builder +} + +func (b FatalError) Unwrap() error { + if b.cause == nil { + return nil + } + if err, ok := b.cause.(error); ok { + return err + } + if s, ok := b.cause.(string); ok { + return errors.New(s) + } + return fmt.Errorf("[%T]: %v", b.cause, b.cause) +} + +// Write implements io.Writer and can be used to store free-form debugging clues. +func (b *FatalError) Write(p []byte) (n int, err error) { return b.clues.Write(p) } + +func (b FatalError) Error() string { + buf := &strings.Builder{} + fmt.Fprintln(buf, "[compiler panic] ", strings.TrimSpace(b.Unwrap().Error())) + if b.clues.Len() > 0 { + fmt.Fprintln(buf, "\n"+b.clues.String()) + } + if len(b.stack) > 0 { + // Shift stack track by 2 spaces for better readability. + stack := regexp.MustCompile("(?m)^").ReplaceAll(b.stack, []byte(" ")) + fmt.Fprintln(buf, "\nOriginal stack trace:\n", string(stack)) + } + return buf.String() +} + +func bailout(cause interface{}) *FatalError { + b := &FatalError{ + cause: cause, + stack: debug.Stack(), + } + return b +} + +func bailingOut(err interface{}) (*FatalError, bool) { + fe, ok := err.(*FatalError) + return fe, ok +} + +func removeMatching[T comparable](haystack []T, needle T) []T { + var result []T + for _, el := range haystack { + if el != needle { + result = append(result, el) + } + } + return result +} diff --git a/compiler/version_check.go b/compiler/version_check.go index b248bebff..d672fa45a 100644 --- a/compiler/version_check.go +++ b/compiler/version_check.go @@ -1,30 +1,79 @@ -// +build go1.12 +//go:build go1.19 package compiler import ( - "bytes" "fmt" - "io/ioutil" + "os" + "os/exec" "path/filepath" + "strconv" + "strings" ) // Version is the GopherJS compiler version string. -const Version = "1.12-3" +const Version = "1.19.0-beta1+go1.19.13" // GoVersion is the current Go 1.x version that GopherJS is compatible with. -const GoVersion = 12 +const GoVersion = 19 // CheckGoVersion checks the version of the Go distribution // at goroot, and reports an error if it's not compatible // with this version of the GopherJS compiler. func CheckGoVersion(goroot string) error { - v, err := ioutil.ReadFile(filepath.Join(goroot, "VERSION")) + if nvc, err := strconv.ParseBool(os.Getenv("GOPHERJS_SKIP_VERSION_CHECK")); err == nil && nvc { + return nil + } + v, err := goRootVersion(goroot) if err != nil { - return fmt.Errorf("GopherJS %s requires a Go 1.12.x distribution, but failed to read its VERSION file: %v", Version, err) + return fmt.Errorf("unable to detect Go version for %q: %w", goroot, err) } - if !bytes.HasPrefix(v, []byte("go1.12")) { // TODO(dmitshur): Change this before Go 1.120 comes out. - return fmt.Errorf("GopherJS %s requires a Go 1.12.x distribution, but found version %s", Version, v) + if !strings.HasPrefix(v, "go1."+strconv.Itoa(GoVersion)) { + return fmt.Errorf("GopherJS %s requires a Go 1.%d.x distribution, but found version %s", Version, GoVersion, v) } return nil } + +// goRootVersion determines the Go release for the given GOROOT installation. +func goRootVersion(goroot string) (string, error) { + if b, err := os.ReadFile(filepath.Join(goroot, "VERSION")); err == nil { + // Standard Go distribution has a VERSION file inside its GOROOT, + // checking its first line is the most efficient option. + v, _, _ := strings.Cut(string(b), "\n") + return v, nil + } + + // Fall back to the "go version" command. + cmd := exec.Command(filepath.Join(goroot, "bin", "go"), "version") + out, err := cmd.Output() + if err != nil { + return "", fmt.Errorf("`go version` command failed: %w", err) + } + // Expected output: go version go1.18.1 linux/amd64 + parts := strings.Split(string(out), " ") + if len(parts) != 4 { + return "", fmt.Errorf("unexpected `go version` output %q, expected 4 words", string(out)) + } + return parts[2], nil +} + +// GoRelease does a best-effort to identify the Go release we are building with. +// If unable to determine the precise version for the given GOROOT, falls back +// to the best guess available. +func GoRelease(goroot string) string { + v, err := goRootVersion(goroot) + if err == nil { + // Prefer using the actual version of the GOROOT we are working with. + return v + } + + // Use Go version GopherJS release was tested against as a fallback. By + // convention, it is included in the GopherJS version after the plus sign. + parts := strings.Split(Version, "+") + if len(parts) == 2 { + return parts[1] + } + + // If everything else fails, return just the Go version without patch level. + return fmt.Sprintf("go1.%d", GoVersion) +} diff --git a/compiler/version_check_test.go b/compiler/version_check_test.go new file mode 100644 index 000000000..aa2f4d1f8 --- /dev/null +++ b/compiler/version_check_test.go @@ -0,0 +1,28 @@ +package compiler + +import ( + "runtime" + "strings" + "testing" +) + +func TestGoRelease(t *testing.T) { + t.Run("goroot", func(t *testing.T) { + got := GoRelease(runtime.GOROOT()) + want := runtime.Version() + if got != want { + t.Fatalf("Got: goRelease(%q) returned %q. Want %s.", runtime.GOROOT(), got, want) + } + }) + + t.Run("fallback", func(t *testing.T) { + const goroot = "./invalid goroot" + got := GoRelease(goroot) + if got == "" { + t.Fatalf("Got: goRelease(%q) returned \"\". Want: a Go version.", goroot) + } + if !strings.HasSuffix(Version, "+"+got) { + t.Fatalf("Got: goRelease(%q) returned %q. Want: a fallback to GopherJS version suffix %q.", goroot, got, Version) + } + }) +} diff --git a/doc/compatibility.md b/doc/compatibility.md new file mode 100644 index 000000000..5b85023bc --- /dev/null +++ b/doc/compatibility.md @@ -0,0 +1,68 @@ +# GopherJS compatibility + +_TL;DR: GopherJS aims to provide full compatibility with regular Go, but JavaScript runtime introduces unavoidable differences._ + +Go ecosystem is broad and complex, which means there are several dimensions in which different levels of compatibility can be achieved: + +1. **[Go Language Specification](https://golang.org/ref/spec)**: full compatibility. With the exception of several minor differences documented below, GopherJS _should_ be fully compliant with the language specification (e.g. type system, goroutines, operations, built-ins, etc.). +2. **[Go Standard Library](https://pkg.go.dev/std)**: mostly compatible. GopherJS attempts to support as much of standard library as possible, but certain functionality is impossible or difficult to implement within the JavaScript runtime, most of which is related to os interaction, low-level runtime manipulation or `unsafe`. See [package compatibility table](packages.md) and [syscall support](syscalls.md) for details. +3. **Build system and tooling**: partially compatible. The `gopherjs` CLI tool is used to build and test GopherJS code. It currently supports building `GOPATH` projects, but Go Modules support is missing (see https://github.com/gopherjs/gopherjs/issues/855). Our goal is to reach complete feature parity with the `go` tool, but there is a large amount of work required to get there. Other notable challenges include: + - Limited [compiler directive](pragma.md) (a.k.a. "pragma") support. Those are considered compiler implementation-specific and are generally not portable. + - GopherJS ships with [standard library augmentations](../compiler/natives/src/), that are required to make it work in a browser. Those are applied on-the-fly during the build process and are generally invisible to any third-party tooling such as linters. In most cases that shouldn't matter, since they never change public interfaces of the standard library packages, but this is something to be aware of. + - Runtime debuggers and profilers. Since GopherJS compiles Go to JavaScript, one must use JavaScript debuggers and profilers (e.g. browser dev tools) instead of the normal Go ones (e.g. delve or pprof). Unfortunately, limited sourcemap support makes this experience less than ideal at the moment. + +## Go version compatibility + +In general, for a given release of GopherJS the following statements _should_ be true: + +- GopherJS compiler can be built from source with the latest stable Go release at the time when the GopherJS release is created, or any newer Go release. + + Example: you can build GopherJS `1.12-3` with Go `1.12` or newer. + +- GopherJS compiler can build code using standard library of a specific Go version, normally the latest stable at the time of GopherJS release. In most cases, it should be compatible with all patch versions within the minor Go version, but this is not guaranteed. + + Example: GopherJS `1.16.0+go1.16.2` (see [developer documentation](https://github.com/gopherjs/gopherjs/wiki/Developer-Guidelines#versions) about GopherJS versioning schema) can build code with GOROOT pointing at Go `1.16.0` or `1.16.2`, but not at Go `1.15.x` or `1.17.x`. + +- Users can use older GopherJS releases if they need to target older Go versions, but only the latest GopherJS release is officially supported at this time. + +_Note_: we would love to make GopherJS compatible with more Go releases, but the amount of effort required to support that exceeds amount of time we currently have available. If you wish to lend your help to make that possible, please reach out to us! + +## How to report a incompatibility issue? + +First of all, please check the list of known issues below, [package support table](packages.md), as well as [open issues](https://github.com/gopherjs/gopherjs/issues) on GitHub. If the issue is already known, great! You've saved yourself a bit of time. Feel free to add any extra details you think are relevant, though. + +If the issue is not known yet, please open a new issue on GitHub and include the following information: + +1. Go and GopherJS versions you are using. +2. In which environment do you see the issue (browser, nodejs, etc.). +3. A minimal program that behaves differently when compiled with the regular Go compiler and GopherJS. + +Now that the issue exists, we (GopherJS maintainers) will do our best to address it as promptly as we can. Note, however, that all of us are working on GopherJS in our spare time after our job and family responsibilities, so we can't guarantee an immediate fix. + +🚧 If you would like to help, please consider [submitting a pull request](https://github.com/gopherjs/gopherjs/wiki/Developer-Guidelines) with a fix. If you are unsure of the best way to approach the issue, we will be happy to share whatever knowledge we can! 😃 + +## How to write portable code + +For the most part, GopherJS shouldn't require any special support for the code that only uses [supported standard packages](packages.md). + +However, if you do need to provide different implementations depending on the target architecture, you can use [build constraints](https://golang.org/cmd/go/#hdr-Build_constraints) to do so. By default, GopherJS uses `GOOS=js GOARCH=ecmascript`, which can be used in build constraints: + +- `//go:build js` — the source will be used for GopherJS and Go WebAssembly, but not for native builds. +- `//go:build js && ecmascript` — the source will be used for GopherJS only, and not WebAssembly or native builds. +- `//go:build js && wasm` — the source will be used for Go WebAssembly, and not GopherJS or native builds. +- `//go:build gopherjs` — the source will be used only by the GopherJS compiler, regardless of the `GOOS` and `GOARCH`. Use this constraint for sources that are not portable to other Go implementations. + +Also be careful about using GopherJS-specific packages (e.g. `github.com/gopherjs/gopherjs/js`) or features (e.g. [wrapping JavaScript objects](https://github.com/gopherjs/gopherjs/wiki/JavaScript-Tips-and-Gotchas#tips) into Go structs), since those won't work outside of GopherJS. + +### Portability between Go and TinyGo WebAssembly implementations + +GopherJS implements `syscall/js` package, so it _should_ be able to run most code written for WebAssembly. However, in practice this topic is largely unexplored at this time. + +It is worth noting that Go predeclares both architecture-independent [numeric types](https://go.dev/ref/spec#Numeric_types) (`int32`, `int64`, etc.) and ones with implementation-specific sizes (`int`, `uintptr`, etc.). Pay attention to this distinction to avoid portability issues between 32-bit and 64-bit platforms. + +🚧 If you have first-hand experience with this, please consider adding it to this section! + +## Known Go specification violations + +- Bit shifts of a negative amount (e.g. `42 << -1`) panic in Go, but not in GopherJS. +- See also [open issues](https://github.com/gopherjs/gopherjs/issues) and [known failing compiler tests](https://github.com/gopherjs/gopherjs/blob/master/tests/run.go). diff --git a/doc/packages.md b/doc/packages.md index c86c36f32..ca1ff80e5 100644 --- a/doc/packages.md +++ b/doc/packages.md @@ -1,157 +1,167 @@ # Supported Packages -On each commit, Circle CI automatically compiles all supported packages with GopherJS and runs their tests: +On each commit, Github Actions CI automatically compiles all supported packages with GopherJS and runs their tests: -[![Circle CI](https://circleci.com/gh/gopherjs/gopherjs.svg?style=svg)](https://circleci.com/gh/gopherjs/gopherjs) +[![Github Actions CI](https://github.com/gopherjs/gopherjs/actions/workflows/ci.yaml/badge.svg)](https://github.com/gopherjs/gopherjs/actions/workflows/ci.yaml) -Name | Supported | Comment ------------------- | ------------ | ---------------------------------------------------------------------------------- -archive | | --- tar | ✅ yes | --- zip | ✅ yes | -bufio | ✅ yes | -builtin | ✅ yes | -bytes | ✅ yes | -compress | | --- bzip2 | ✅ yes | --- flate | ✅ yes | --- gzip | ✅ yes | --- lzw | ✅ yes | --- zlib | ✅ yes | -container | | --- heap | ✅ yes | --- list | ✅ yes | --- ring | ✅ yes | -crypto | | --- aes | ✅ yes | --- cipher | ✅ yes | --- des | ✅ yes | --- dsa | ✅ yes | --- ecdsa | ✅ yes | --- elliptic | ✅ yes | --- hmac | ✅ yes | --- md5 | ✅ yes | --- rand | ✅ yes | --- rc4 | ✅ yes | --- rsa | ✅ yes | --- sha1 | ✅ yes | --- sha256 | ✅ yes | --- sha512 | ✅ yes | --- subtle | ✅ yes | --- tls | ❌ no | --- x509 | ✅ yes | --- -- pkix | ✅ yes | -database | | --- sql | ✅ yes | --- -- driver | ✅ yes | -debug | | --- dwarf | ✅ yes | --- elf | ✅ yes | --- gosym | ☑️ partially | on binaries generated by gc --- macho | ✅ yes | --- pe | ✅ yes | -encoding | | --- ascii85 | ✅ yes | --- asn1 | ✅ yes | --- base32 | ✅ yes | --- base64 | ✅ yes | --- binary | ✅ yes | --- csv | ✅ yes | --- gob | ✅ yes | --- hex | ✅ yes | --- json | ✅ yes | --- pem | ✅ yes | --- xml | ✅ yes | -errors | ✅ yes | -expvar | ✅ yes | -flag | ✅ yes | -fmt | ✅ yes | -go | | --- ast | ✅ yes | --- build | ❌ no | --- constant | ✅ yes | --- doc | ✅ yes | --- format | ✅ yes | --- importer | ❌ no | --- parser | ✅ yes | --- printer | ✅ yes | --- scanner | ✅ yes | --- token | ✅ yes | --- types | ❌ no | -hash | | --- adler32 | ✅ yes | --- crc32 | ✅ yes | --- crc64 | ✅ yes | --- fnv | ✅ yes | -html | ✅ yes | --- template | ✅ yes | -image | ✅ yes | --- color | ✅ yes | --- -- palette | ✅ yes | --- draw | ✅ yes | --- gif | ✅ yes | --- jpeg | ✅ yes | --- png | ✅ yes | -index | | --- suffixarray | ✅ yes | -io | ✅ yes | --- ioutil | ✅ yes | -log | ✅ yes | --- syslog | ❌ no | -math | ✅ yes | --- big | ✅ yes | --- bits | ✅ yes | --- cmplx | ✅ yes | --- rand | ✅ yes | -mime | ✅ yes | --- multipart | ✅ yes | --- quotedprintable | ✅ yes | -net | ❌ no | --- http | ☑️ partially | client only, emulated via Fetch/XMLHttpRequest APIs;
node.js requires polyfill --- -- cgi | ❌ no | --- -- cookiejar | ✅ yes | --- -- fcgi | ✅ yes | --- -- httptest | ☑️ partially | --- -- httputil | ☑️ partially | --- -- pprof | ❌ no | --- mail | ✅ yes | --- rpc | ☑️ partially | data structures only (no net) --- -- jsonrpc | ✅ yes | --- smtp | ☑️ partially | data structures only (no net) --- textproto | ✅ yes | --- url | ✅ yes | -os | ☑️ partially | node.js only --- exec | ☑️ partially | node.js only --- signal | ☑️ partially | node.js only --- user | ☑️ partially | node.js only -path | ✅ yes | --- filepath | ✅ yes | -plugin | ❌ no | -reflect | ✅ yes | except StructOf (pending) -regexp | ✅ yes | --- syntax | ✅ yes | -runtime | ☑️ partially | SetMutexProfileFraction, SetFinalizer, ReadMemStats, Callers, CallersFrames unsupported --- cgo | ❌ no | --- debug | ❌ no | --- pprof | ❌ no | --- race | ❌ no | --- trace | ❌ no | -sort | ✅ yes | -strconv | ✅ yes | -strings | ✅ yes | -sync | ✅ yes | --- atomic | ✅ yes | -syscall | ☑️ partially | node.js only -testing | ☑️ partially | AllocsPerRun unsupported --- iotest | ✅ yes | --- quick | ✅ yes | -text | | --- scanner | ✅ yes | --- tabwriter | ✅ yes | --- template | ✅ yes | --- -- parse | ✅ yes | -time | ✅ yes | UTC and Local only (see [issue](https://github.com/gopherjs/gopherjs/issues/64)) -unicode | ✅ yes | --- utf16 | ✅ yes | --- utf8 | ✅ yes | -unsafe | ❌ no | +| Name | Supported | Comment | +| ------------------- | ------------ | --------------------------------------------------------------------------------- | +| archive | | +| -- tar | ✅ yes | +| -- zip | ✅ yes | +| bufio | ✅ yes | +| builtin | ✅ yes | +| bytes | ✅ yes | +| compress | | +| -- bzip2 | ✅ yes | +| -- flate | ✅ yes | +| -- gzip | ✅ yes | +| -- lzw | ✅ yes | +| -- zlib | ✅ yes | +| container | | +| -- heap | ✅ yes | +| -- list | ✅ yes | +| -- ring | ✅ yes | +| context | ✅ yes | +| crypto | ✅ yes | +| -- aes | ✅ yes | +| -- cipher | ✅ yes | +| -- des | ✅ yes | +| -- dsa | ✅ yes | +| -- ecdsa | ✅ yes | +| -- ed25519 | ✅ yes | +| -- elliptic | ✅ yes | +| -- hmac | ✅ yes | +| -- md5 | ✅ yes | +| -- rand | ✅ yes | +| -- rc4 | ✅ yes | +| -- rsa | ✅ yes | +| -- sha1 | ✅ yes | +| -- sha256 | ✅ yes | +| -- sha512 | ✅ yes | +| -- subtle | ✅ yes | +| -- tls | ❌ no | +| -- x509 | ✅ yes | +| -- -- pkix | ✅ yes | +| database | | +| -- sql | ✅ yes | +| -- -- driver | ✅ yes | +| debug | | +| -- dwarf | ✅ yes | +| -- elf | ✅ yes | +| -- gosym | ☑️ partially | on binaries generated by gc | +| -- macho | ✅ yes | +| -- pe | ✅ yes | +| -- plan9obj | ✅ yes | +| embed | ❌ no | Not implemented yet: https://github.com/gopherjs/gopherjs/issues/997. | +| encoding | | +| -- ascii85 | ✅ yes | +| -- asn1 | ✅ yes | +| -- base32 | ✅ yes | +| -- base64 | ✅ yes | +| -- binary | ✅ yes | +| -- csv | ✅ yes | +| -- gob | ✅ yes | +| -- hex | ✅ yes | +| -- json | ✅ yes | +| -- pem | ✅ yes | +| -- xml | ✅ yes | +| errors | ✅ yes | +| expvar | ✅ yes | +| flag | ✅ yes | +| fmt | ✅ yes | +| go | | +| -- ast | ✅ yes | +| -- build | ❌ no | +| -- build/constraint | ✅ yes | +| -- constant | ✅ yes | +| -- doc | ✅ yes | +| -- format | ✅ yes | +| -- importer | ❌ no | +| -- parser | ✅ yes | +| -- printer | ✅ yes | +| -- scanner | ✅ yes | +| -- token | ✅ yes | +| -- types | ❌ no | +| hash | ✅ yes | +| -- adler32 | ✅ yes | +| -- crc32 | ✅ yes | +| -- crc64 | ✅ yes | +| -- fnv | ✅ yes | +| -- maphash | ✅ yes | +| html | ✅ yes | +| -- template | ✅ yes | +| image | ✅ yes | +| -- color | ✅ yes | +| -- -- palette | ✅ yes | +| -- draw | ✅ yes | +| -- gif | ✅ yes | +| -- jpeg | ✅ yes | +| -- png | ✅ yes | +| index | | +| -- suffixarray | ✅ yes | +| io | ✅ yes | +| -- fs | ✅ yes | +| -- ioutil | ✅ yes | +| log | ✅ yes | +| -- syslog | ❌ no | +| math | ✅ yes | +| -- big | ✅ yes | +| -- bits | ✅ yes | +| -- cmplx | ✅ yes | +| -- rand | ✅ yes | +| mime | ✅ yes | +| -- multipart | ✅ yes | +| -- quotedprintable | ✅ yes | +| net | ☑️ partially | network is simulated, supports only localhost connections | +| -- http | ☑️ partially | client only, emulated via Fetch/XMLHttpRequest APIs;
node.js requires polyfill | +| -- -- cgi | ❌ no | +| -- -- cookiejar | ✅ yes | +| -- -- fcgi | ✅ yes | +| -- -- httptest | ☑️ partially | +| -- -- httputil | ☑️ partially | +| -- -- pprof | ❌ no | +| -- mail | ✅ yes | +| -- rpc | ☑️ partially | data structures only (no net) | +| -- -- jsonrpc | ✅ yes | +| -- smtp | ☑️ partially | data structures only (no net) | +| -- textproto | ✅ yes | +| -- url | ✅ yes | +| os | ☑️ partially | node.js only | +| -- exec | ☑️ partially | node.js only | +| -- signal | ☑️ partially | node.js only | +| -- user | ☑️ partially | node.js only | +| path | ✅ yes | +| -- filepath | ✅ yes | +| plugin | ❌ no | +| reflect | ✅ yes | +| regexp | ✅ yes | +| -- syntax | ✅ yes | +| runtime | ☑️ partially | SetMutexProfileFraction, SetFinalizer, ReadMemStats unsupported | +| -- metrics | ☑️ partially | Same as runtime. | +| -- cgo | ❌ no | +| -- debug | ❌ no | +| -- pprof | ❌ no | +| -- race | ❌ no | +| -- trace | ❌ no | +| sort | ✅ yes | +| strconv | ✅ yes | +| strings | ✅ yes | +| sync | ✅ yes | +| -- atomic | ✅ yes | +| syscall | ☑️ partially | node.js only | +| testing | ☑️ partially | AllocsPerRun and T.Helper are unsupported. | +| -- iotest | ✅ yes | +| -- fstest | ✅ yes | +| -- quick | ✅ yes | +| text | | +| -- scanner | ✅ yes | +| -- tabwriter | ✅ yes | +| -- template | ✅ yes | +| -- -- parse | ✅ yes | +| time | ✅ yes | UTC and Local only (see [issue](https://github.com/gopherjs/gopherjs/issues/64)) | +| -- tzdata | ✅ yes | +| unicode | ✅ yes | +| -- utf16 | ✅ yes | +| -- utf8 | ✅ yes | +| unsafe | ❌ no | diff --git a/doc/pargma.md b/doc/pargma.md new file mode 100644 index 000000000..2bcf71f93 --- /dev/null +++ b/doc/pargma.md @@ -0,0 +1,196 @@ +# Compiler directives + +Compiler directives allow to provide low-level instructions to the GopherJS +compiler, which are outside of the Go language itself. Compiler directives are +specific to each Go compiler implementation and may be a source of portability +issues, so it is recommended to avoid using them if possible. + +GopherJS compiler supports the following directives: + +- [go:linkname](#golinkname) +- [go:embed](#goembed) +- [gopherjs:keep-original](#gopherjskeep-original) +- [gopherjs:purge](#gopherjspurge) +- [gopherjs:override-signature](#gopherjsoverride-signature) + +## `go:linkname` + +This is a limited version of the `go:linkname` directive the upstream Go +compiler implements. Usage: + +```go +import _ "unsafe" // for go:linkname + +//go:linkname localname import/path.remotename +func localname(arg1 type1, arg2 type2) (returnType, error) +``` + +This directive has an effect of making a `remotename` function from +`import/path` package available to the current package as `localname`. +Signatures of `remotename` and `localname` must be identical. Since this +directive can subvert package incapsulation, the source file that uses the +directive must also import `unsafe`. + +The following directive formats are supported: + +- `//go:linkname .` +- `//go:linkname ..` +- `//go:linkname .<(*type)>.` + +Compared to the upstream Go, the following limitations exist in GopherJS: + +- The directive only works on package-level functions or methods (variables + are not supported). +- The directive can only be used to "import" implementation from another + package, and not to "provide" local implementation to another package. + +See [gopherjs/issues/1000](https://github.com/gopherjs/gopherjs/issues/1000) +for details. + +## `go:embed` + +This is a very similar version of the `go:embed` directive the upstream Go +compiler implements. +GopherJS leverages [goembed](https://github.com/visualfc/goembed) +to parse this directive and provide support reading embedded content. Usage: + +```go +import _ "embed" // for go:embed + +//go:embed externalText +var embeddedText string + +//go:embed externalContent +var embeddedContent []byte + +//go:embed file1 +//go:embed file2 +// ... +//go:embed image/* blobs/* +var embeddedFiles embed.FS +``` + +This directive affects the variable specification (e.g. `embeddedText`) +that the comment containing the directive is associated with. +There may be one embed directives associated with `string` or `[]byte` +variables. There may be one or more embed directives associated with +`embed.FS` variables and each directive may contain one or more +file matching patterns. The effect is that the variable will be assigned to +the content (e.g. `externalText`) given in the directive. In the case +of `embed.FS`, several embedded files will be accessible. + +See [pkg.go.dev/embed](https://pkg.go.dev/embed#hdr-Directives) +for more information. + +## `gopherjs:keep-original` + +This directive is custom to GopherJS. This directive can be added to a +function declaration in the native file overrides as part of the build step. + +This will keep the original function by the same name as the function +in the overrides, however it will prepend `_gopherjs_original_` to the original +function's name. This allows the original function to be called by functions +in the overrides and the overridden function to be called instead of the +original. This is useful when wanting to augment the original behavior without +having to rewrite the entire original function. Usage: + +```go +//gopherjs:keep-original +func foo(a, b int) int { + return _gopherjs_original_foo(a+1, b+1) - 1 +} +``` + +## `gopherjs:purge` + +This directive is custom to GopherJS. This directive can be added +to most declarations and specification in the native file overrides as +part of the build step. +This can be added to structures, interfaces, methods, functions, +variables, or constants, but are not supported for imports, structure fields, +nor interface function signatures. + +This will remove the original structure, interface, etc from both the override +files and the original files. +If this is added to a structure, then all functions in the original files +that use that structure as a receiver will also be removed. +This is useful for removing all the code that is invalid in GopherJS, +such as code using unsupported features (e.g. generic interfaces before +generics were fully supported). In many cases the overrides to replace +the original code may not have use of all the original functions and +variables or the original code is not intended to be replaced yet. +Usage: + +```go +//gopherjs:purge +var data string + +//gopherjs:purge +// This will also purge any function starting with `dataType` as the receiver. +type dataType struct {} + +//gopherjs:purge +type interfaceType interface{} + +//gopherjs:purge +func doThing[T ~string](value T) +``` + +## `gopherjs:override-signature` + +This directive is custom to GopherJS. This directive can be added to a +function declaration in the native file overrides as part of the build step. + +This will remove the function from the overrides but record the signature +used in the overrides, then update the original function with that signature +provided in the overrides. +The affect is to change the receiver, type parameters, +parameters, or return types of the original function. The original function +and override function must have the same function key name so that they can +be associated, meaning the identifier of the receiver, if there is one, must +match and the identifier of the function must match. + +This allows the signature to be modified without modifying the body of a +function thus allowing the types to be adjusted to work in GopherJS. +The signature may need to be replaced because it uses a parameter type +that is invalid in GopherJS or the signature uses unsupported features +(e.g. generic interfaces before generics were fully supported). +Usage: + +```go +// -- in original file -- +func Foo[T comparable](a, b T) (T, bool) { + if a == b { + return a, true + } + return b, false +} + +// -- in override file -- +//gopherjs:override-signature +func Foo(a, b any) (any, bool) + +// -- result in augmented original -- +func Foo(a, b any) (any, bool) { + if a == b { + return a, true + } + return b, false +} +``` + +```go +// -- in original file -- +func (f *Foo[A, B, C]) Bar(a int, b *A) (*A, error) { + //... +} + +// -- in override file -- +//gopherjs:override-signature +func (f *Foo) Bar(a int, b jsTypeA) (jsTypeA, error) + +// -- result in augmented original -- +func (f *Foo) Bar(a int, b jsTypeA) (jsTypeA, error) { + //... +} +``` diff --git a/doc/syscalls.md b/doc/syscalls.md index 59366267e..eb75c148f 100644 --- a/doc/syscalls.md +++ b/doc/syscalls.md @@ -1,8 +1,9 @@ -System Calls ------------- +## System Calls System calls are the bridge between your application and your operating system. They are used whenever you access something outside of your application's memory, for example when you write to the console, when you read or write files or when you access the network. In Go, system calls are mostly used by the `os` package, hence the name. When using GopherJS you need to consider if system calls are available or not. +Starting with 1.18, GopherJS provides the same [set of cross-platform](https://pkg.go.dev/syscall?GOOS=js) syscalls as standard Go WebAssembly, emulating them via JavaScript APIs available in the runtime (browser or Node.js). + ### Output redirection to console If system calls are not available in your environment (see below), then a special redirection of `os.Stdout` and `os.Stderr` is applied. It buffers a line until it is terminated by a line break and then prints it via JavaScript's `console.log` to your browser's JavaScript console or your system console. That way, `fmt.Println` etc. work as expected, even if system calls are not available. @@ -11,24 +12,53 @@ If system calls are not available in your environment (see below), then a specia The JavaScript environment of a web browser is completely isolated from your operating system to protect your machine. You don't want any web page to read or write files on your disk without your consent. That is why system calls are not and will never be available when running your code in a web browser. -### Node.js on Linux and macOS +However, certain subsets of syscalls can be emulated using third-party libraries. For example, [BrowserFS](https://github.com/jvilk/BrowserFS) library can be used to emulate Node.js file system API in a browser using HTML5 LocalStorage or other fallbacks. + +### Node.js on all platforms + +GopherJS emulates syscalls for accessing file system (and a few others) using Node.js standard [`fs`](https://nodejs.org/api/fs.html) and [`process`](https://nodejs.org/api/process.html) APIs. No additional extensions are required for this in GopherJS 1.18 and newer. + +### Node.js with the legacy node-syscall extension. + +Prior to 1.18 GopherJS required a custom Node extension to be installed that provided access to system calls on Linux and MacOS. Currently this extension is deprecated and its support will be removed entirely in a future release. This decision is motivated by several factors: + +- This extension has been developed before Go had WebAssembly support and at the time there was no easier way to provide file system access. Today standard library for `js/wasm` provides most of the relevant functionality without the need for custom extensions. +- It required GopherJS to support building Go standard library with multiple different GOOS/GOARCH combinations, which significantly increased maintenance effort and slowed down support for new Go versions. It was not supported on Windows entirely. +- Using this extension required non-trivial setup for the users who needed file system access. +- The extension itself contained significant technical debt and potential memory leaks. +- File system syscalls use asynchronous Node.js API, so other goroutines doesn't get blocked. -GopherJS has support for system calls on Linux and macOS. Before running your code with Node.js, you need to install the system calls module. The module is compatible with Node.js version 10.0.0 (or newer). If you want to use an older version you can opt to not install the module, but then system calls are not available. +Issue [#693](https://github.com/gopherjs/gopherjs/issues/693) has a detailed discussion of this. + +In GopherJS 1.18 support for this extension is disabled by default to reduce the output size. It can be enabled with a build tag `legacy_syscall` (for example, `gopherjs build --tags legacy_syscall pkg/name`) with the following caveats: + +- `node-syscall` extension must be built and installed according to instructions below. +- Functions `syscall.Syscall`, `syscall.Syscall6`, `syscall.RawSyscall` and `syscall.RawSyscall6` will be changed to use the extension API and can be called from the third-party code. +- Standard library is still built for `js/wasm` regardless of the host OS, so the syscall package API will remain reduced compared to `linux` or `darwin`. +- All functions in the `syscall` package that GopherJS emulates via Node.js APIs will continue using those APIs. +- While executing a legacy syscall, all goroutines get blocked. This may cause some programs not to behave as expected. + +We strongly recommend upgrading your package to not use `syscall` package directly and use higher-level APIs in the `os` package, which will continue working. + +The module is compatible with Node.js version 10.0.0 (or newer). If you want to use an older version you can opt to not install the module, but then system calls are not available. Compile and install the module with: ``` -cd $GOPATH/src/github.com/gopherjs/gopherjs/node-syscall/ -npm install --global node-gyp -node-gyp rebuild -mkdir -p ~/.node_libraries/ -cp build/Release/syscall.node ~/.node_libraries/syscall.node +cd gopherjs/node-syscall/ +npm install ``` -### Node.js on Windows +You can copy build/Release/syscall.node into you `node_modules` directory and run `node -r syscall` to make sure the module can be loaded successfully. -When running your code with Node.js on Windows, it is theoretically possible to use system calls. To do so, you would need a special Node.js module that provides direct access to system calls. However, since the interface is quite different from the one used on Linux and macOS, the system calls module included in GopherJS currently does not support Windows. Sorry. Get in contact if you feel like you want to change this situation. +Alternatively, in _your_ `package.json` you can do something like this: -### Caveats +``` +{ + "dependencies": { + "syscall": "file:path/to/gopherjs/node-syscall" + } +} +``` -Note that even with syscalls enabled in Node.js, some programs may not behave as expected due to the fact that the current implementation blocks other goroutines during a syscall, which can lead to a deadlock in some situations. This is not considered a bug, as it is considered sufficient for most test cases (which is all Node.js should be used for). Get in contact if you feel like you want to change this situation. +Which will make `npm install` in your project capable of building the extension. You may need to set `export NODE_PATH="$(npm root)"` to ensure that node can load modules from any working directory, for example when running `gopherjs test`. diff --git a/embed.go b/embed.go new file mode 100644 index 000000000..6d034b97a --- /dev/null +++ b/embed.go @@ -0,0 +1,22 @@ +// This file exists to embed the js/ and nosync/ directories. The "embed" +// package only supports embedding files stored beneath the directory level +// of the go:embed directive, so we do the embedding here, then inject the +// fs reference to the gopherjspkg package, where it's used. In the future we +// may wish to refactor that, as the gopherjspkg package may not really be +// necessary at all any more. + +package main + +import ( + "embed" + "net/http" + + "github.com/gopherjs/gopherjs/compiler/gopherjspkg" +) + +//go:embed js nosync +var fs embed.FS + +func init() { + gopherjspkg.RegisterFS(http.FS(fs)) +} diff --git a/go.mod b/go.mod new file mode 100644 index 000000000..faa94f070 --- /dev/null +++ b/go.mod @@ -0,0 +1,25 @@ +module github.com/gopherjs/gopherjs + +go 1.18 + +require ( + github.com/evanw/esbuild v0.25.4 + github.com/fsnotify/fsnotify v1.5.1 + github.com/google/go-cmp v0.5.8 + github.com/msvitok77/goembed v0.3.5 + github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86 + github.com/neelance/sourcemap v0.0.0-20200213170602-2833bce08e4c + github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636 + github.com/sirupsen/logrus v1.8.1 + github.com/spf13/cobra v1.9.1 + github.com/spf13/pflag v1.0.6 + golang.org/x/sync v0.5.0 + golang.org/x/sys v0.10.0 + golang.org/x/term v0.0.0-20220411215600-e5f449aeb171 + golang.org/x/tools v0.16.0 +) + +require ( + github.com/inconshreveable/mousetrap v1.1.0 // indirect + golang.org/x/mod v0.14.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 000000000..29dc8900b --- /dev/null +++ b/go.sum @@ -0,0 +1,45 @@ +github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/evanw/esbuild v0.25.4 h1:k1bTSim+usBG27w7BfOCorhgx3tO+6bAfMj5pR+6SKg= +github.com/evanw/esbuild v0.25.4/go.mod h1:D2vIQZqV/vIf/VRHtViaUtViZmG7o+kKmlBfVQuRi48= +github.com/fsnotify/fsnotify v1.5.1 h1:mZcQUHVQUQWoPXXtuf9yuEXKudkV2sx1E06UadKWpgI= +github.com/fsnotify/fsnotify v1.5.1/go.mod h1:T3375wBYaZdLLcVNkcVbzGHY7f1l/uK5T5Ai1i3InKU= +github.com/google/go-cmp v0.5.8 h1:e6P7q2lk1O+qJJb4BtCQXlK8vWEO8V1ZeuEdJNOqZyg= +github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY= +github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8= +github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw= +github.com/msvitok77/goembed v0.3.5 h1:SNdkLLipv4YGNVWCVCn+/N01aSp7Ga6/YOcB+kYxnhk= +github.com/msvitok77/goembed v0.3.5/go.mod h1:ycBNmh+53HrsZPQfWOJHYXbu7vLwb1QYdJISOyKlnnc= +github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86 h1:D6paGObi5Wud7xg83MaEFyjxQB1W5bz5d0IFppr+ymk= +github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86/go.mod h1:kHJEU3ofeGjhHklVoIGuVj85JJwZ6kWPaJwCIxgnFmo= +github.com/neelance/sourcemap v0.0.0-20200213170602-2833bce08e4c h1:bY6ktFuJkt+ZXkX0RChQch2FtHpWQLVS8Qo1YasiIVk= +github.com/neelance/sourcemap v0.0.0-20200213170602-2833bce08e4c/go.mod h1:Qr6/a/Q4r9LP1IltGz7tA7iOK1WonHEYhu1HRBA7ZiM= +github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= +github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= +github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM= +github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636 h1:aSISeOcal5irEhJd1M+IrApc0PdcN7e7Aj4yuEnOrfQ= +github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636/go.mod h1:TDJrrUr11Vxrven61rcy3hJMUqaf/CLWYhHNPmT14Lk= +github.com/sirupsen/logrus v1.8.1 h1:dJKuHgqk1NNQlqoA6BTlM1Wf9DOH3NBjQyu0h9+AZZE= +github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0= +github.com/spf13/cobra v1.9.1 h1:CXSaggrXdbHK9CF+8ywj8Amf7PBRmPCOJugH954Nnlo= +github.com/spf13/cobra v1.9.1/go.mod h1:nDyEzZ8ogv936Cinf6g1RU9MRY64Ir93oCnqb9wxYW0= +github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o= +github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg= +github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w= +github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs= +golang.org/x/mod v0.14.0 h1:dGoOF9QVLYng8IHTm7BAyWqCqSheQ5pYWGhzW00YJr0= +golang.org/x/mod v0.14.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c= +golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE= +golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk= +golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.10.0 h1:SqMFp9UcQJZa+pmYuAKjd9xq1f0j5rLcDIk0mj4qAsA= +golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/term v0.0.0-20220411215600-e5f449aeb171 h1:EH1Deb8WZJ0xc0WK//leUHXcX9aLE5SymusoTmMZye8= +golang.org/x/term v0.0.0-20220411215600-e5f449aeb171/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8= +golang.org/x/tools v0.16.0 h1:GO788SKMRunPIBCXiQyo2AaexLstOrVhuAL5YwsckQM= +golang.org/x/tools v0.16.0/go.mod h1:kYVVN6I1mBNoB1OX+noeBjbRk4IUEPa7JJ+TJMEooJ0= +gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/internal/errorList/errorList.go b/internal/errorList/errorList.go new file mode 100644 index 000000000..531a0f4e0 --- /dev/null +++ b/internal/errorList/errorList.go @@ -0,0 +1,68 @@ +package errorList + +import ( + "errors" + "fmt" +) + +// ErrTooManyErrors is added to the ErrorList by the Trim method. +var ErrTooManyErrors = errors.New("too many errors") + +// ErrorList wraps multiple errors as a single error. +type ErrorList []error + +func (errs ErrorList) Error() string { + if len(errs) == 0 { + return "" + } + return fmt.Sprintf("%s (and %d more errors)", errs[0].Error(), len(errs[1:])) +} + +// ErrOrNil returns nil if ErrorList is empty, or the error otherwise. +func (errs ErrorList) ErrOrNil() error { + if len(errs) == 0 { + return nil + } + return errs +} + +// Append an error to the list. +// +// If err is an instance of ErrorList, the lists are concatenated together, +// otherwise err is appended at the end of the list. If err is nil, the list is +// returned unmodified. +// +// err := DoStuff() +// errList := errList.Append(err) +func (errs ErrorList) Append(err error) ErrorList { + if err == nil { + return errs + } + if err, ok := err.(ErrorList); ok { + return append(errs, err...) + } + return append(errs, err) +} + +// AppendDistinct is similar to Append, but doesn't append the error if it has +// the same message as the last error on the list. +func (errs ErrorList) AppendDistinct(err error) ErrorList { + if l := len(errs); l > 0 { + if prev := errs[l-1]; prev != nil && err.Error() == prev.Error() { + return errs // The new error is the same as the last one, skip it. + } + } + + return errs.Append(err) +} + +// Trim the error list if it has more than limit errors. If the list is trimmed, +// all extraneous errors are replaced with a single ErrTooManyErrors, making the +// returned ErrorList length of limit+1. +func (errs ErrorList) Trim(limit int) ErrorList { + if len(errs) <= limit { + return errs + } + + return append(errs[:limit], ErrTooManyErrors) +} diff --git a/internal/experiments/experiments.go b/internal/experiments/experiments.go new file mode 100644 index 000000000..85abce562 --- /dev/null +++ b/internal/experiments/experiments.go @@ -0,0 +1,122 @@ +// Package experiments managed the list of experimental feature flags supported +// by GopherJS. +// +// GOPHERJS_EXPERIMENT environment variable can be used to control which features +// are enabled. +package experiments + +import ( + "errors" + "fmt" + "os" + "reflect" + "strconv" + "strings" +) + +var ( + // ErrInvalidDest is a kind of error returned by parseFlags() when the dest + // argument does not meet the requirements. + ErrInvalidDest = errors.New("invalid flag struct") + // ErrInvalidFormat is a kind of error returned by parseFlags() when the raw + // flag string format is not valid. + ErrInvalidFormat = errors.New("invalid flag string format") +) + +// Env contains experiment flag values from the GOPHERJS_EXPERIMENT +// environment variable. +var Env Flags + +func init() { + if err := parseFlags(os.Getenv("GOPHERJS_EXPERIMENT"), &Env); err != nil { + panic(fmt.Errorf("failed to parse GOPHERJS_EXPERIMENT flags: %w", err)) + } +} + +// Flags contains flags for currently supported experiments. +type Flags struct { + Generics bool `flag:"generics"` +} + +// parseFlags parses the `raw` flags string and populates flag values in the +// `dest`. +// +// `raw` is a comma-separated experiment flag list: `,,...`. Each +// flag may be either `` or `=`. Omitting value is equivalent +// to " = true". Spaces around name and value are trimmed during +// parsing. Flag name can't be empty. If the same flag is specified multiple +// times, the last instance takes effect. +// +// `dest` must be a pointer to a struct, which fields will be populated with +// flag values. Mapping between flag names and fields is established with the +// `flag` field tag. Fields without a flag tag will be left unpopulated. +// If multiple fields are associated with the same flag result is unspecified. +// +// Flags that don't have a corresponding field are silently ignored. This is +// done to avoid fatal errors when an experiment flag is removed from code, but +// remains specified in user's environment. +// +// Currently only boolean flag values are supported, as defined by +// `strconv.ParseBool()`. +func parseFlags(raw string, dest any) error { + ptr := reflect.ValueOf(dest) + if ptr.Type().Kind() != reflect.Pointer || ptr.Type().Elem().Kind() != reflect.Struct { + return fmt.Errorf("%w: must be a pointer to a struct", ErrInvalidDest) + } + if ptr.IsNil() { + return fmt.Errorf("%w: must not be nil", ErrInvalidDest) + } + fields := fieldMap(ptr.Elem()) + + if raw == "" { + return nil + } + entries := strings.Split(raw, ",") + + for _, entry := range entries { + entry = strings.TrimSpace(entry) + var key, val string + if idx := strings.IndexRune(entry, '='); idx != -1 { + key = strings.TrimSpace(entry[0:idx]) + val = strings.TrimSpace(entry[idx+1:]) + } else { + key = entry + val = "true" + } + + if key == "" { + return fmt.Errorf("%w: empty flag name", ErrInvalidFormat) + } + + field, ok := fields[key] + if !ok { + // Unknown field value, possibly an obsolete experiment, ignore it. + continue + } + if field.Type().Kind() != reflect.Bool { + return fmt.Errorf("%w: only boolean flags are supported", ErrInvalidDest) + } + b, err := strconv.ParseBool(val) + if err != nil { + return fmt.Errorf("%w: can't parse %q as boolean for flag %q", ErrInvalidFormat, val, key) + } + field.SetBool(b) + } + + return nil +} + +// fieldMap returns a map of struct fieldMap keyed by the value of the "flag" tag. +// +// `s` must be a struct. Fields without a "flag" tag are ignored. If multiple +// fieldMap have the same flag, the last field wins. +func fieldMap(s reflect.Value) map[string]reflect.Value { + typ := s.Type() + result := map[string]reflect.Value{} + for i := 0; i < typ.NumField(); i++ { + if val, ok := typ.Field(i).Tag.Lookup("flag"); ok { + result[val] = s.Field(i) + } + } + return result +} diff --git a/internal/experiments/experiments_test.go b/internal/experiments/experiments_test.go new file mode 100644 index 000000000..e1c3e6b38 --- /dev/null +++ b/internal/experiments/experiments_test.go @@ -0,0 +1,132 @@ +package experiments + +import ( + "errors" + "testing" + + "github.com/google/go-cmp/cmp" +) + +func TestParseFlags(t *testing.T) { + type testFlags struct { + Exp1 bool `flag:"exp1"` + Exp2 bool `flag:"exp2"` + Untagged bool + } + + tests := []struct { + descr string + raw string + want testFlags + wantErr error + }{{ + descr: "default values", + raw: "", + want: testFlags{ + Exp1: false, + Exp2: false, + }, + }, { + descr: "true flag", + raw: "exp1=true", + want: testFlags{ + Exp1: true, + Exp2: false, + }, + }, { + descr: "false flag", + raw: "exp1=false", + want: testFlags{ + Exp1: false, + Exp2: false, + }, + }, { + descr: "implicit value", + raw: "exp1", + want: testFlags{ + Exp1: true, + Exp2: false, + }, + }, { + descr: "multiple flags", + raw: "exp1=true,exp2=true", + want: testFlags{ + Exp1: true, + Exp2: true, + }, + }, { + descr: "repeated flag", + raw: "exp1=false,exp1=true", + want: testFlags{ + Exp1: true, + Exp2: false, + }, + }, { + descr: "spaces", + raw: " exp1 = true, exp2=true ", + want: testFlags{ + Exp1: true, + Exp2: true, + }, + }, { + descr: "unknown flags", + raw: "Exp1=true,Untagged,Foo=true", + want: testFlags{ + Exp1: false, + Exp2: false, + Untagged: false, + }, + }, { + descr: "empty flag name", + raw: "=true", + wantErr: ErrInvalidFormat, + }, { + descr: "invalid flag value", + raw: "exp1=foo", + wantErr: ErrInvalidFormat, + }} + + for _, test := range tests { + t.Run(test.descr, func(t *testing.T) { + got := testFlags{} + err := parseFlags(test.raw, &got) + if test.wantErr != nil { + if !errors.Is(err, test.wantErr) { + t.Errorf("Got: parseFlags(%q) returned error: %v. Want: %v.", test.raw, err, test.wantErr) + } + } else { + if err != nil { + t.Fatalf("Got: parseFlags(%q) returned error: %v. Want: no error.", test.raw, err) + } + if diff := cmp.Diff(test.want, got); diff != "" { + t.Fatalf("parseFlags(%q) returned diff (-want,+got):\n%s", test.raw, diff) + } + } + }) + } + + t.Run("invalid dest type", func(t *testing.T) { + var dest string + err := parseFlags("", &dest) + if !errors.Is(err, ErrInvalidDest) { + t.Fatalf("Got: parseFlags() returned error: %v. Want: %v.", err, ErrInvalidDest) + } + }) + + t.Run("nil dest", func(t *testing.T) { + err := parseFlags("", (*struct{})(nil)) + if !errors.Is(err, ErrInvalidDest) { + t.Fatalf("Got: parseFlags() returned error: %v. Want: %v.", err, ErrInvalidDest) + } + }) + + t.Run("unsupported flag type", func(t *testing.T) { + var dest struct { + Foo string `flag:"foo"` + } + err := parseFlags("foo", &dest) + if !errors.Is(err, ErrInvalidDest) { + t.Fatalf("Got: parseFlags() returned error: %v. Want: %v.", err, ErrInvalidDest) + } + }) +} diff --git a/internal/govendor/subst/export.go b/internal/govendor/subst/export.go new file mode 100644 index 000000000..00a77ca49 --- /dev/null +++ b/internal/govendor/subst/export.go @@ -0,0 +1,50 @@ +// Package subst is an excerpt from x/tools/go/ssa responsible for performing +// type substitution in types defined in terms of type parameters with provided +// type arguments. +package subst + +import ( + "fmt" + "go/types" +) + +// To simplify future updates of the borrowed code, we minimize modifications +// to it as much as possible. This file implements an exported interface to the +// original code for us to use. + +// Subster performs type parameter substitution. +type Subster struct { + impl *subster +} + +// New creates a new Subster with a given list of type parameters and matching args. +func New(tc *types.Context, tParams *types.TypeParamList, tArgs []types.Type) *Subster { + if tParams.Len() != len(tArgs) { + panic(fmt.Errorf("number of type parameters and arguments must match: %d => %d", tParams.Len(), len(tArgs))) + } + + if tParams.Len() == 0 && len(tArgs) == 0 { + return nil + } + + subst := makeSubster(tc, nil, tParams, tArgs, false) + return &Subster{impl: subst} +} + +// Type returns a version of typ with all references to type parameters +// replaced with the corresponding type arguments. +func (s *Subster) Type(typ types.Type) types.Type { + if s == nil { + return typ + } + return s.impl.typ(typ) +} + +// Types returns a version of ts with all references to type parameters +// replaced with the corresponding type arguments. +func (s *Subster) Types(ts []types.Type) []types.Type { + if s == nil { + return ts + } + return s.impl.types(ts) +} diff --git a/internal/govendor/subst/subst.go b/internal/govendor/subst/subst.go new file mode 100644 index 000000000..825e3c7f1 --- /dev/null +++ b/internal/govendor/subst/subst.go @@ -0,0 +1,480 @@ +// Copyright 2022 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Copy of https://cs.opensource.google/go/x/tools/+/refs/tags/v0.17.0:go/ssa/subst.go +// Any changes to this copy are labelled with GOPHERJS. +package subst + +import ( + "go/types" +) + +// Type substituter for a fixed set of replacement types. +// +// A nil *subster is an valid, empty substitution map. It always acts as +// the identity function. This allows for treating parameterized and +// non-parameterized functions identically while compiling to ssa. +// +// Not concurrency-safe. +type subster struct { + replacements map[*types.TypeParam]types.Type // values should contain no type params + cache map[types.Type]types.Type // cache of subst results + ctxt *types.Context // cache for instantiation + scope *types.Scope // *types.Named declared within this scope can be substituted (optional) + debug bool // perform extra debugging checks + // TODO(taking): consider adding Pos + // TODO(zpavlinovic): replacements can contain type params + // when generating instances inside of a generic function body. +} + +// Returns a subster that replaces tparams[i] with targs[i]. Uses ctxt as a cache. +// targs should not contain any types in tparams. +// scope is the (optional) lexical block of the generic function for which we are substituting. +func makeSubster(ctxt *types.Context, scope *types.Scope, tparams *types.TypeParamList, targs []types.Type, debug bool) *subster { + assert(tparams.Len() == len(targs), "makeSubster argument count must match") + + subst := &subster{ + replacements: make(map[*types.TypeParam]types.Type, tparams.Len()), + cache: make(map[types.Type]types.Type), + ctxt: ctxt, + scope: scope, + debug: debug, + } + for i := 0; i < tparams.Len(); i++ { + subst.replacements[tparams.At(i)] = targs[i] + } + if subst.debug { + subst.wellFormed() + } + return subst +} + +// wellFormed asserts that subst was properly initialized. +func (subst *subster) wellFormed() { + if subst == nil { + return + } + // Check that all of the type params do not appear in the arguments. + s := make(map[types.Type]bool, len(subst.replacements)) + for tparam := range subst.replacements { + s[tparam] = true + } + for _, r := range subst.replacements { + if reaches(r, s) { + panic(subst) + } + } +} + +// typ returns the type of t with the type parameter tparams[i] substituted +// for the type targs[i] where subst was created using tparams and targs. +func (subst *subster) typ(t types.Type) (res types.Type) { + if subst == nil { + return t // A nil subst is type preserving. + } + if r, ok := subst.cache[t]; ok { + return r + } + defer func() { + subst.cache[t] = res + }() + + // fall through if result r will be identical to t, types.Identical(r, t). + switch t := t.(type) { + case *types.TypeParam: + // GOPHERJS: Replaced an assert that was causing a panic for nested types with code from + // https://cs.opensource.google/go/x/tools/+/refs/tags/v0.33.0:go/ssa/subst.go;l=92 + if r := subst.replacements[t]; r != nil { + return r + } + return t + + case *types.Basic: + return t + + case *types.Array: + if r := subst.typ(t.Elem()); r != t.Elem() { + return types.NewArray(r, t.Len()) + } + return t + + case *types.Slice: + if r := subst.typ(t.Elem()); r != t.Elem() { + return types.NewSlice(r) + } + return t + + case *types.Pointer: + if r := subst.typ(t.Elem()); r != t.Elem() { + return types.NewPointer(r) + } + return t + + case *types.Tuple: + return subst.tuple(t) + + case *types.Struct: + return subst.struct_(t) + + case *types.Map: + key := subst.typ(t.Key()) + elem := subst.typ(t.Elem()) + if key != t.Key() || elem != t.Elem() { + return types.NewMap(key, elem) + } + return t + + case *types.Chan: + if elem := subst.typ(t.Elem()); elem != t.Elem() { + return types.NewChan(t.Dir(), elem) + } + return t + + case *types.Signature: + return subst.signature(t) + + case *types.Union: + return subst.union(t) + + case *types.Interface: + return subst.interface_(t) + + case *types.Named: + return subst.named(t) + + default: + panic("unreachable") + } +} + +// types returns the result of {subst.typ(ts[i])}. +func (subst *subster) types(ts []types.Type) []types.Type { + res := make([]types.Type, len(ts)) + for i := range ts { + res[i] = subst.typ(ts[i]) + } + return res +} + +func (subst *subster) tuple(t *types.Tuple) *types.Tuple { + if t != nil { + if vars := subst.varlist(t); vars != nil { + return types.NewTuple(vars...) + } + } + return t +} + +type varlist interface { + At(i int) *types.Var + Len() int +} + +// fieldlist is an adapter for structs for the varlist interface. +type fieldlist struct { + str *types.Struct +} + +func (fl fieldlist) At(i int) *types.Var { return fl.str.Field(i) } +func (fl fieldlist) Len() int { return fl.str.NumFields() } + +func (subst *subster) struct_(t *types.Struct) *types.Struct { + if t != nil { + if fields := subst.varlist(fieldlist{t}); fields != nil { + tags := make([]string, t.NumFields()) + for i, n := 0, t.NumFields(); i < n; i++ { + tags[i] = t.Tag(i) + } + return types.NewStruct(fields, tags) + } + } + return t +} + +// varlist reutrns subst(in[i]) or return nils if subst(v[i]) == v[i] for all i. +func (subst *subster) varlist(in varlist) []*types.Var { + var out []*types.Var // nil => no updates + for i, n := 0, in.Len(); i < n; i++ { + v := in.At(i) + w := subst.var_(v) + if v != w && out == nil { + out = make([]*types.Var, n) + for j := 0; j < i; j++ { + out[j] = in.At(j) + } + } + if out != nil { + out[i] = w + } + } + return out +} + +func (subst *subster) var_(v *types.Var) *types.Var { + if v != nil { + if typ := subst.typ(v.Type()); typ != v.Type() { + if v.IsField() { + return types.NewField(v.Pos(), v.Pkg(), v.Name(), typ, v.Embedded()) + } + return types.NewVar(v.Pos(), v.Pkg(), v.Name(), typ) + } + } + return v +} + +func (subst *subster) union(u *types.Union) *types.Union { + var out []*types.Term // nil => no updates + + for i, n := 0, u.Len(); i < n; i++ { + t := u.Term(i) + r := subst.typ(t.Type()) + if r != t.Type() && out == nil { + out = make([]*types.Term, n) + for j := 0; j < i; j++ { + out[j] = u.Term(j) + } + } + if out != nil { + out[i] = types.NewTerm(t.Tilde(), r) + } + } + + if out != nil { + return types.NewUnion(out) + } + return u +} + +func (subst *subster) interface_(iface *types.Interface) *types.Interface { + if iface == nil { + return nil + } + + // methods for the interface. Initially nil if there is no known change needed. + // Signatures for the method where recv is nil. NewInterfaceType fills in the receivers. + var methods []*types.Func + initMethods := func(n int) { // copy first n explicit methods + methods = make([]*types.Func, iface.NumExplicitMethods()) + for i := 0; i < n; i++ { + f := iface.ExplicitMethod(i) + norecv := changeRecv(f.Type().(*types.Signature), nil) + methods[i] = types.NewFunc(f.Pos(), f.Pkg(), f.Name(), norecv) + } + } + for i := 0; i < iface.NumExplicitMethods(); i++ { + f := iface.ExplicitMethod(i) + // On interfaces, we need to cycle break on anonymous interface types + // being in a cycle with their signatures being in cycles with their receivers + // that do not go through a Named. + norecv := changeRecv(f.Type().(*types.Signature), nil) + sig := subst.typ(norecv) + if sig != norecv && methods == nil { + initMethods(i) + } + if methods != nil { + methods[i] = types.NewFunc(f.Pos(), f.Pkg(), f.Name(), sig.(*types.Signature)) + } + } + + var embeds []types.Type + initEmbeds := func(n int) { // copy first n embedded types + embeds = make([]types.Type, iface.NumEmbeddeds()) + for i := 0; i < n; i++ { + embeds[i] = iface.EmbeddedType(i) + } + } + for i := 0; i < iface.NumEmbeddeds(); i++ { + e := iface.EmbeddedType(i) + r := subst.typ(e) + if e != r && embeds == nil { + initEmbeds(i) + } + if embeds != nil { + embeds[i] = r + } + } + + if methods == nil && embeds == nil { + return iface + } + if methods == nil { + initMethods(iface.NumExplicitMethods()) + } + if embeds == nil { + initEmbeds(iface.NumEmbeddeds()) + } + return types.NewInterfaceType(methods, embeds).Complete() +} + +func (subst *subster) named(t *types.Named) types.Type { + // A named type may be: + // (1) ordinary named type (non-local scope, no type parameters, no type arguments), + // (2) locally scoped type, + // (3) generic (type parameters but no type arguments), or + // (4) instantiated (type parameters and type arguments). + tparams := t.TypeParams() + if tparams.Len() == 0 { + if subst.scope != nil && !subst.scope.Contains(t.Obj().Pos()) { + // Outside the current function scope? + return t // case (1) ordinary + } + + // case (2) locally scoped type. + // Create a new named type to represent this instantiation. + // We assume that local types of distinct instantiations of a + // generic function are distinct, even if they don't refer to + // type parameters, but the spec is unclear; see golang/go#58573. + // + // Subtle: We short circuit substitution and use a newly created type in + // subst, i.e. cache[t]=n, to pre-emptively replace t with n in recursive + // types during traversal. This both breaks infinite cycles and allows for + // constructing types with the replacement applied in subst.typ(under). + // + // Example: + // func foo[T any]() { + // type linkedlist struct { + // next *linkedlist + // val T + // } + // } + // + // When the field `next *linkedlist` is visited during subst.typ(under), + // we want the substituted type for the field `next` to be `*n`. + n := types.NewNamed(t.Obj(), nil, nil) + subst.cache[t] = n + subst.cache[n] = n + n.SetUnderlying(subst.typ(t.Underlying())) + return n + } + targs := t.TypeArgs() + + // insts are arguments to instantiate using. + insts := make([]types.Type, tparams.Len()) + + // case (3) generic ==> targs.Len() == 0 + // Instantiating a generic with no type arguments should be unreachable. + // Please report a bug if you encounter this. + assert(targs.Len() != 0, "substition into a generic Named type is currently unsupported") + + // case (4) instantiated. + // Substitute into the type arguments and instantiate the replacements/ + // Example: + // type N[A any] func() A + // func Foo[T](g N[T]) {} + // To instantiate Foo[string], one goes through {T->string}. To get the type of g + // one subsitutes T with string in {N with typeargs == {T} and typeparams == {A} } + // to get {N with TypeArgs == {string} and typeparams == {A} }. + assert(targs.Len() == tparams.Len(), "typeargs.Len() must match typeparams.Len() if present") + for i, n := 0, targs.Len(); i < n; i++ { + inst := subst.typ(targs.At(i)) // TODO(generic): Check with rfindley for mutual recursion + insts[i] = inst + } + r, err := types.Instantiate(subst.ctxt, t.Origin(), insts, false) + assert(err == nil, "failed to Instantiate Named type") + return r +} + +func (subst *subster) signature(t *types.Signature) types.Type { + tparams := t.TypeParams() + + // We are choosing not to support tparams.Len() > 0 until a need has been observed in practice. + // + // There are some known usages for types.Types coming from types.{Eval,CheckExpr}. + // To support tparams.Len() > 0, we just need to do the following [psuedocode]: + // targs := {subst.replacements[tparams[i]]]}; Instantiate(ctxt, t, targs, false) + + assert(tparams.Len() == 0, "Substituting types.Signatures with generic functions are currently unsupported.") + + // Either: + // (1)non-generic function. + // no type params to substitute + // (2)generic method and recv needs to be substituted. + + // Receivers can be either: + // named + // pointer to named + // interface + // nil + // interface is the problematic case. We need to cycle break there! + recv := subst.var_(t.Recv()) + params := subst.tuple(t.Params()) + results := subst.tuple(t.Results()) + if recv != t.Recv() || params != t.Params() || results != t.Results() { + return types.NewSignatureType(recv, nil, nil, params, results, t.Variadic()) + } + return t +} + +// reaches returns true if a type t reaches any type t' s.t. c[t'] == true. +// It updates c to cache results. +// +// reaches is currently only part of the wellFormed debug logic, and +// in practice c is initially only type parameters. It is not currently +// relied on in production. +func reaches(t types.Type, c map[types.Type]bool) (res bool) { + if c, ok := c[t]; ok { + return c + } + + // c is populated with temporary false entries as types are visited. + // This avoids repeat visits and break cycles. + c[t] = false + defer func() { + c[t] = res + }() + + switch t := t.(type) { + case *types.TypeParam, *types.Basic: + return false + case *types.Array: + return reaches(t.Elem(), c) + case *types.Slice: + return reaches(t.Elem(), c) + case *types.Pointer: + return reaches(t.Elem(), c) + case *types.Tuple: + for i := 0; i < t.Len(); i++ { + if reaches(t.At(i).Type(), c) { + return true + } + } + case *types.Struct: + for i := 0; i < t.NumFields(); i++ { + if reaches(t.Field(i).Type(), c) { + return true + } + } + case *types.Map: + return reaches(t.Key(), c) || reaches(t.Elem(), c) + case *types.Chan: + return reaches(t.Elem(), c) + case *types.Signature: + if t.Recv() != nil && reaches(t.Recv().Type(), c) { + return true + } + return reaches(t.Params(), c) || reaches(t.Results(), c) + case *types.Union: + for i := 0; i < t.Len(); i++ { + if reaches(t.Term(i).Type(), c) { + return true + } + } + case *types.Interface: + for i := 0; i < t.NumEmbeddeds(); i++ { + if reaches(t.Embedded(i), c) { + return true + } + } + for i := 0; i < t.NumExplicitMethods(); i++ { + if reaches(t.ExplicitMethod(i).Type(), c) { + return true + } + } + case *types.Named: + return reaches(t.Underlying(), c) + default: + panic("unreachable") + } + return false +} diff --git a/internal/govendor/subst/subst_test.go b/internal/govendor/subst/subst_test.go new file mode 100644 index 000000000..832f0ebd4 --- /dev/null +++ b/internal/govendor/subst/subst_test.go @@ -0,0 +1,104 @@ +// Copyright 2022 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Copy of https://cs.opensource.google/go/x/tools/+/refs/tags/v0.17.0:go/ssa/subst_test.go +package subst + +import ( + "go/ast" + "go/parser" + "go/token" + "go/types" + "testing" +) + +func TestSubst(t *testing.T) { + const source = ` +package P + +type t0 int +func (t0) f() +type t1 interface{ f() } +type t2 interface{ g() } +type t3 interface{ ~int } + +func Fn0[T t1](x T) T { + x.f() + return x +} + +type A[T any] [4]T +type B[T any] []T +type C[T, S any] []struct{s S; t T} +type D[T, S any] *struct{s S; t *T} +type E[T, S any] interface{ F() (T, S) } +type F[K comparable, V any] map[K]V +type G[T any] chan *T +type H[T any] func() T +type I[T any] struct{x, y, z int; t T} +type J[T any] interface{ t1 } +type K[T any] interface{ t1; F() T } +type L[T any] interface{ F() T; J[T] } + +var _ L[int] = Fn0[L[int]](nil) +` + + fset := token.NewFileSet() + f, err := parser.ParseFile(fset, "hello.go", source, 0) + if err != nil { + t.Fatal(err) + } + + var conf types.Config + pkg, err := conf.Check("P", fset, []*ast.File{f}, nil) + if err != nil { + t.Fatal(err) + } + + for _, test := range []struct { + expr string // type expression of Named parameterized type + args []string // type expressions of args for named + want string // expected underlying value after substitution + }{ + {"A", []string{"string"}, "[4]string"}, + {"A", []string{"int"}, "[4]int"}, + {"B", []string{"int"}, "[]int"}, + {"B", []string{"int8"}, "[]int8"}, + {"C", []string{"int8", "string"}, "[]struct{s string; t int8}"}, + {"C", []string{"string", "int8"}, "[]struct{s int8; t string}"}, + {"D", []string{"int16", "string"}, "*struct{s string; t *int16}"}, + {"E", []string{"int32", "string"}, "interface{F() (int32, string)}"}, + {"F", []string{"int64", "string"}, "map[int64]string"}, + {"G", []string{"uint64"}, "chan *uint64"}, + {"H", []string{"uintptr"}, "func() uintptr"}, + {"I", []string{"t0"}, "struct{x int; y int; z int; t P.t0}"}, + {"J", []string{"t0"}, "interface{P.t1}"}, + {"K", []string{"t0"}, "interface{F() P.t0; P.t1}"}, + {"L", []string{"t0"}, "interface{F() P.t0; P.J[P.t0]}"}, + {"L", []string{"L[t0]"}, "interface{F() P.L[P.t0]; P.J[P.L[P.t0]]}"}, + } { + // Eval() expr for its type. + tv, err := types.Eval(fset, pkg, 0, test.expr) + if err != nil { + t.Fatalf("Eval(%s) failed: %v", test.expr, err) + } + // Eval() test.args[i] to get the i'th type arg. + var targs []types.Type + for _, astr := range test.args { + tv, err := types.Eval(fset, pkg, 0, astr) + if err != nil { + t.Fatalf("Eval(%s) failed: %v", astr, err) + } + targs = append(targs, tv.Type) + } + + T := tv.Type.(*types.Named) + + subst := makeSubster(types.NewContext(), nil, T.TypeParams(), targs, true) + sub := subst.typ(T.Underlying()) + if got := sub.String(); got != test.want { + t.Errorf("subst{%v->%v}.typ(%s) = %v, want %v", test.expr, test.args, T.Underlying(), got, test.want) + } + } +} diff --git a/internal/govendor/subst/util.go b/internal/govendor/subst/util.go new file mode 100644 index 000000000..5b55c0310 --- /dev/null +++ b/internal/govendor/subst/util.go @@ -0,0 +1,21 @@ +// Copyright 2013 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package subst + +import "go/types" + +// assert panics with the mesage msg if p is false. +// Avoid combining with expensive string formatting. +// From https://cs.opensource.google/go/x/tools/+/refs/tags/v0.17.0:go/ssa/util.go;l=27 +func assert(p bool, msg string) { + if !p { + panic(msg) + } +} + +// From https://cs.opensource.google/go/x/tools/+/refs/tags/v0.33.0:go/ssa/wrappers.go;l=262 +func changeRecv(s *types.Signature, recv *types.Var) *types.Signature { + return types.NewSignatureType(recv, nil, nil, s.Params(), s.Results(), s.Variadic()) +} diff --git a/internal/srctesting/srctesting.go b/internal/srctesting/srctesting.go new file mode 100644 index 000000000..e4242991c --- /dev/null +++ b/internal/srctesting/srctesting.go @@ -0,0 +1,284 @@ +// Package srctesting contains common helpers for unit testing source code +// analysis and transformation. +package srctesting + +import ( + "bytes" + "fmt" + "go/ast" + "go/format" + "go/parser" + "go/token" + "go/types" + "path/filepath" + "strings" + "testing" + + "golang.org/x/tools/go/packages" +) + +// Fixture provides utilities for parsing and type checking Go code in tests. +type Fixture struct { + T *testing.T + FileSet *token.FileSet + Info *types.Info + Packages map[string]*types.Package +} + +func newInfo() *types.Info { + return &types.Info{ + Types: make(map[ast.Expr]types.TypeAndValue), + Defs: make(map[*ast.Ident]types.Object), + Uses: make(map[*ast.Ident]types.Object), + Implicits: make(map[ast.Node]types.Object), + Selections: make(map[*ast.SelectorExpr]*types.Selection), + Scopes: make(map[ast.Node]*types.Scope), + Instances: make(map[*ast.Ident]types.Instance), + } +} + +// New creates a fresh Fixture. +func New(t *testing.T) *Fixture { + return &Fixture{ + T: t, + FileSet: token.NewFileSet(), + Info: newInfo(), + Packages: map[string]*types.Package{}, + } +} + +// Parse source from the string and return complete AST. +func (f *Fixture) Parse(name, src string) *ast.File { + f.T.Helper() + file, err := parser.ParseFile(f.FileSet, name, src, parser.ParseComments) + if err != nil { + f.T.Fatalf("Failed to parse test source: %s", err) + } + return file +} + +// Check type correctness of the provided AST. +// +// Fails the test if type checking fails. Provided AST is expected not to have +// any imports. If f.Info is nil, it will create a new types.Info instance +// to store type checking results and return it, otherwise f.Info is used. +func (f *Fixture) Check(importPath string, files ...*ast.File) (*types.Info, *types.Package) { + f.T.Helper() + config := &types.Config{ + Sizes: &types.StdSizes{WordSize: 4, MaxAlign: 8}, + Importer: f, + } + info := f.Info + if info == nil { + info = newInfo() + } + pkg, err := config.Check(importPath, f.FileSet, files, info) + if err != nil { + f.T.Fatalf("Failed to type check test source: %s", err) + } + f.Packages[importPath] = pkg + return info, pkg +} + +// Import implements types.Importer. +func (f *Fixture) Import(path string) (*types.Package, error) { + pkg, ok := f.Packages[path] + if !ok { + return nil, fmt.Errorf("missing type info for package %q", path) + } + return pkg, nil +} + +// ParseFuncDecl parses source with a single function defined and returns the +// function AST. +// +// Fails the test if there isn't exactly one function declared in the source. +func ParseFuncDecl(t *testing.T, src string) *ast.FuncDecl { + t.Helper() + decl := ParseDecl(t, src) + fdecl, ok := decl.(*ast.FuncDecl) + if !ok { + t.Fatalf("Got %T decl, expected *ast.FuncDecl", decl) + } + return fdecl +} + +// ParseDecl parses source with a single declaration and +// returns that declaration AST. +// +// Fails the test if there isn't exactly one declaration in the source. +func ParseDecl(t *testing.T, src string) ast.Decl { + t.Helper() + file := New(t).Parse("test.go", src) + if l := len(file.Decls); l != 1 { + t.Fatalf(`Got %d decls in the sources, expected exactly 1`, l) + } + return file.Decls[0] +} + +// ParseSpec parses source with a single declaration containing +// a single specification and returns that specification AST. +// +// Fails the test if there isn't exactly one declaration and +// one specification in the source. +func ParseSpec(t *testing.T, src string) ast.Spec { + t.Helper() + decl := ParseDecl(t, src) + gdecl, ok := decl.(*ast.GenDecl) + if !ok { + t.Fatalf("Got %T decl, expected *ast.GenDecl", decl) + } + if l := len(gdecl.Specs); l != 1 { + t.Fatalf(`Got %d spec in the sources, expected exactly 1`, l) + } + return gdecl.Specs[0] +} + +// Format AST node into a string. +// +// The node type must be *ast.File, *printer.CommentedNode, []ast.Decl, +// []ast.Stmt, or assignment-compatible to ast.Expr, ast.Decl, ast.Spec, or +// ast.Stmt. +func Format(t *testing.T, fset *token.FileSet, node any) string { + t.Helper() + buf := &bytes.Buffer{} + if err := format.Node(buf, fset, node); err != nil { + t.Fatalf("Failed to format AST node %T: %s", node, err) + } + return buf.String() +} + +// LookupObj returns a top-level object with the given name. +// +// Methods can be referred to as RecvTypeName.MethodName. +func LookupObj(pkg *types.Package, name string) types.Object { + path := strings.Split(name, ".") + scope := pkg.Scope() + var obj types.Object + + for len(path) > 0 { + obj = scope.Lookup(path[0]) + if obj == nil { + panic(fmt.Sprintf("failed to find %q in %q", path[0], name)) + } + path = path[1:] + + if fun, ok := obj.(*types.Func); ok { + scope = fun.Scope() + continue + } + + // If we are here, the latest object is a named type. If there are more path + // elements left, they must refer to field or method. + if len(path) > 0 { + obj, _, _ = types.LookupFieldOrMethod(obj.Type(), true, obj.Pkg(), path[0]) + path = path[1:] + if fun, ok := obj.(*types.Func); ok { + scope = fun.Scope() + } + } + } + return obj +} + +type Source struct { + Name string + Contents []byte +} + +// ParseSources parses the given source files and returns the root package +// that contains the given source files. +// +// The source file should all be from the same package as the files for the +// root package. At least one source file must be given. +// The root package's path will be `command-line-arguments`. +// +// The auxiliary files can be for different packages but should have paths +// added to the source name so that they can be grouped together by package. +// To import an auxiliary package, the path should be prepended by +// `github.com/gopherjs/gopherjs/compiler`. +func ParseSources(t *testing.T, sourceFiles []Source, auxFiles []Source) *packages.Package { + t.Helper() + const mode = packages.NeedName | + packages.NeedFiles | + packages.NeedImports | + packages.NeedDeps | + packages.NeedTypes | + packages.NeedSyntax + + dir, err := filepath.Abs(`./`) + if err != nil { + t.Fatal(`error getting working directory:`, err) + } + + patterns := make([]string, len(sourceFiles)) + overlay := make(map[string][]byte, len(sourceFiles)) + for i, src := range sourceFiles { + filename := src.Name + patterns[i] = filename + absName := filepath.Join(dir, filename) + overlay[absName] = []byte(src.Contents) + } + for _, src := range auxFiles { + absName := filepath.Join(dir, src.Name) + overlay[absName] = []byte(src.Contents) + } + + config := &packages.Config{ + Mode: mode, + Overlay: overlay, + Dir: dir, + } + + pkgs, err := packages.Load(config, patterns...) + if err != nil { + t.Fatal(`error loading packages:`, err) + } + + hasErrors := false + packages.Visit(pkgs, nil, func(pkg *packages.Package) { + for _, err := range pkg.Errors { + hasErrors = true + t.Error(err) + } + }) + if hasErrors { + t.FailNow() + } + + if len(pkgs) != 1 { + t.Fatal(`expected one and only one root package but got`, len(pkgs)) + } + return pkgs[0] +} + +// GetNodeAtLineNo returns the first node of type N that starts on the given +// line in the given file. This helps lookup nodes that aren't named but +// are needed by a specific test. +func GetNodeAtLineNo[N ast.Node](file *ast.File, fSet *token.FileSet, lineNo int) N { + var node N + keepLooking := true + ast.Inspect(file, func(n ast.Node) bool { + if n == nil || !keepLooking { + return false + } + nodeLine := fSet.Position(n.Pos()).Line + switch { + case nodeLine < lineNo: + // We haven't reached the line yet, so check if we can skip over + // this whole node or if we should look inside it. + return fSet.Position(n.End()).Line >= lineNo + case nodeLine > lineNo: + // We went past it without finding it, so stop looking. + keepLooking = false + return false + default: // nodeLine == lineNo + if n, ok := n.(N); ok { + node = n + keepLooking = false + } + return keepLooking + } + }) + return node +} diff --git a/internal/srctesting/srctesting_test.go b/internal/srctesting/srctesting_test.go new file mode 100644 index 000000000..44fa51ead --- /dev/null +++ b/internal/srctesting/srctesting_test.go @@ -0,0 +1,28 @@ +package srctesting + +import "testing" + +func TestFixture(t *testing.T) { + f := New(t) + + const src1 = `package foo + type X int + ` + _, foo := f.Check("pkg/foo", f.Parse("foo.go", src1)) + + if !foo.Complete() { + t.Fatalf("Got: incomplete package pkg/foo: %s. Want: complete package.", foo) + } + + const src2 = `package bar + import "pkg/foo" + func Fun() foo.X { return 0 } + ` + + // Should type check successfully with dependency on pkg/foo. + _, bar := f.Check("pkg/bar", f.Parse("bar.go", src2)) + + if !bar.Complete() { + t.Fatalf("Got: incomplete package pkg/bar: %s. Want: complete package.", foo) + } +} diff --git a/internal/sysutil/sysutil.go b/internal/sysutil/sysutil.go index c3631f2b2..e19eb02e1 100644 --- a/internal/sysutil/sysutil.go +++ b/internal/sysutil/sysutil.go @@ -1,3 +1,4 @@ +//go:build !windows // +build !windows // Package sysutil contains system-specific utilities. diff --git a/internal/testingx/must.go b/internal/testingx/must.go new file mode 100644 index 000000000..62d27dce8 --- /dev/null +++ b/internal/testingx/must.go @@ -0,0 +1,24 @@ +// Package testingx provides helpers for use with the testing package. +package testingx + +import "testing" + +// Must provides a concise way to handle returned error in cases that +// "should never happen"©. +// +// This function can be used in test case setup that can be presumed to be +// correct, but technically may return an error. This function MUST NOT be used +// to check for test case conditions themselves because it generates a generic, +// nondescript test error message. +// +// func startServer(addr string) (*server, err) +// mustServer := testingx.Must[*server](t) +// mustServer(startServer(":8080")) +func Must[T any](t *testing.T) func(v T, err error) T { + return func(v T, err error) T { + if err != nil { + t.Fatalf("Got: unexpected error: %s. Want: no error.", err) + } + return v + } +} diff --git a/internal/testmain/testdata/testpkg/external_test.go b/internal/testmain/testdata/testpkg/external_test.go new file mode 100644 index 000000000..5d9a4ba11 --- /dev/null +++ b/internal/testmain/testdata/testpkg/external_test.go @@ -0,0 +1,16 @@ +package testpkg_test + +import ( + "fmt" + "testing" +) + +func TestYyy(t *testing.T) {} + +func BenchmarkYyy(b *testing.B) {} + +func FuzzYyy(f *testing.F) { f.Skip() } + +func ExampleYyy() { + fmt.Println("hello") // Output: hello +} diff --git a/internal/testmain/testdata/testpkg/inpackage_test.go b/internal/testmain/testdata/testpkg/inpackage_test.go new file mode 100644 index 000000000..dd3878289 --- /dev/null +++ b/internal/testmain/testdata/testpkg/inpackage_test.go @@ -0,0 +1,13 @@ +package testpkg + +import "testing" + +func TestXxx(t *testing.T) {} + +func BenchmarkXxx(b *testing.B) {} + +func FuzzXxx(f *testing.F) { f.Skip() } + +func ExampleXxx() {} + +func TestMain(m *testing.M) { m.Run() } diff --git a/internal/testmain/testdata/testpkg/testpkg.go b/internal/testmain/testdata/testpkg/testpkg.go new file mode 100644 index 000000000..cdeafab4b --- /dev/null +++ b/internal/testmain/testdata/testpkg/testpkg.go @@ -0,0 +1,4 @@ +package testpkg + +// Xxx is an sample function. +func Xxx() {} diff --git a/internal/testmain/testmain.go b/internal/testmain/testmain.go new file mode 100644 index 000000000..3de87d382 --- /dev/null +++ b/internal/testmain/testmain.go @@ -0,0 +1,305 @@ +package testmain + +import ( + "bytes" + "errors" + "fmt" + "go/ast" + "go/build" + "go/doc" + "go/parser" + "go/token" + "path" + "sort" + "strings" + "text/template" + "unicode" + "unicode/utf8" + + "golang.org/x/tools/go/buildutil" +) + +// FuncLocation describes whether a test function is in-package or external +// (i.e. in the xxx_test package). +type FuncLocation uint8 + +const ( + // LocUnknown is the default, invalid value of the PkgType. + LocUnknown FuncLocation = iota + // LocInPackage is an in-package test. + LocInPackage + // LocExternal is an external test (i.e. in the xxx_test package). + LocExternal +) + +func (tl FuncLocation) String() string { + switch tl { + case LocInPackage: + return "_test" + case LocExternal: + return "_xtest" + default: + return "" + } +} + +// TestFunc describes a single test/benchmark/fuzz function in a package. +type TestFunc struct { + Location FuncLocation // Where the function is defined. + Name string // Function name. +} + +// ExampleFunc describes an example. +type ExampleFunc struct { + Location FuncLocation // Where the function is defined. + Name string // Function name. + Output string // Expected output. + Unordered bool // Output is allowed to be unordered. + EmptyOutput bool // Whether the output is expected to be empty. +} + +// Executable returns true if the example function should be executed with tests. +func (ef ExampleFunc) Executable() bool { + return ef.EmptyOutput || ef.Output != "" +} + +// TestMain is a helper type responsible for generation of the test main package. +type TestMain struct { + Package *build.Package + Context *build.Context + Tests []TestFunc + Benchmarks []TestFunc + Fuzz []TestFunc + Examples []ExampleFunc + TestMain *TestFunc +} + +// Scan package for tests functions. +func (tm *TestMain) Scan(fset *token.FileSet) error { + if err := tm.scanPkg(fset, tm.Package.TestGoFiles, LocInPackage); err != nil { + return err + } + if err := tm.scanPkg(fset, tm.Package.XTestGoFiles, LocExternal); err != nil { + return err + } + return nil +} + +func (tm *TestMain) scanPkg(fset *token.FileSet, files []string, loc FuncLocation) error { + for _, name := range files { + srcPath := path.Join(tm.Package.Dir, name) + f, err := buildutil.OpenFile(tm.Context, srcPath) + if err != nil { + return fmt.Errorf("failed to open source file %q: %w", srcPath, err) + } + defer f.Close() + parsed, err := parser.ParseFile(fset, srcPath, f, parser.ParseComments) + if err != nil { + return fmt.Errorf("failed to parse %q: %w", srcPath, err) + } + + if err := tm.scanFile(parsed, loc); err != nil { + return err + } + } + return nil +} + +func (tm *TestMain) scanFile(f *ast.File, loc FuncLocation) error { + for _, d := range f.Decls { + n, ok := d.(*ast.FuncDecl) + if !ok { + continue + } + if n.Recv != nil { + continue + } + name := n.Name.String() + switch { + case isTestMain(n): + if tm.TestMain != nil { + return errors.New("multiple definitions of TestMain") + } + tm.TestMain = &TestFunc{ + Location: loc, + Name: name, + } + case isTest(name, "Test"): + tm.Tests = append(tm.Tests, TestFunc{ + Location: loc, + Name: name, + }) + case isTest(name, "Benchmark"): + tm.Benchmarks = append(tm.Benchmarks, TestFunc{ + Location: loc, + Name: name, + }) + case isTest(name, "Fuzz"): + tm.Fuzz = append(tm.Fuzz, TestFunc{ + Location: loc, + Name: name, + }) + } + } + + ex := doc.Examples(f) + sort.Slice(ex, func(i, j int) bool { return ex[i].Order < ex[j].Order }) + for _, e := range ex { + tm.Examples = append(tm.Examples, ExampleFunc{ + Location: loc, + Name: "Example" + e.Name, + Output: e.Output, + Unordered: e.Unordered, + EmptyOutput: e.EmptyOutput, + }) + } + + return nil +} + +// Synthesize main package for the tests. +func (tm *TestMain) Synthesize(fset *token.FileSet) (*build.Package, *ast.File, error) { + buf := &bytes.Buffer{} + if err := testmainTmpl.Execute(buf, tm); err != nil { + return nil, nil, fmt.Errorf("failed to generate testmain source for package %s: %w", tm.Package.ImportPath, err) + } + src, err := parser.ParseFile(fset, "_testmain.go", buf, 0) + if err != nil { + return nil, nil, fmt.Errorf("failed to parse testmain source for package %s: %w", tm.Package.ImportPath, err) + } + pkg := &build.Package{ + ImportPath: tm.Package.ImportPath + ".testmain", + Name: "main", + GoFiles: []string{"_testmain.go"}, + } + return pkg, src, nil +} + +func (tm *TestMain) hasTests(loc FuncLocation, executableOnly bool) bool { + if tm.TestMain != nil && tm.TestMain.Location == loc { + return true + } + // Tests, Benchmarks and Fuzz targets are always executable. + all := []TestFunc{} + all = append(all, tm.Tests...) + all = append(all, tm.Benchmarks...) + + for _, t := range all { + if t.Location == loc { + return true + } + } + + for _, e := range tm.Examples { + if e.Location == loc && (e.Executable() || !executableOnly) { + return true + } + } + return false +} + +// ImportTest returns true if in-package test package needs to be imported. +func (tm *TestMain) ImportTest() bool { return tm.hasTests(LocInPackage, false) } + +// ImportXTest returns true if external test package needs to be imported. +func (tm *TestMain) ImportXTest() bool { return tm.hasTests(LocExternal, false) } + +// ExecutesTest returns true if in-package test package has executable tests. +func (tm *TestMain) ExecutesTest() bool { return tm.hasTests(LocInPackage, true) } + +// ExecutesXTest returns true if external package test package has executable tests. +func (tm *TestMain) ExecutesXTest() bool { return tm.hasTests(LocExternal, true) } + +// isTestMain tells whether fn is a TestMain(m *testing.M) function. +func isTestMain(fn *ast.FuncDecl) bool { + if fn.Name.String() != "TestMain" || + fn.Type.Results != nil && len(fn.Type.Results.List) > 0 || + fn.Type.Params == nil || + len(fn.Type.Params.List) != 1 || + len(fn.Type.Params.List[0].Names) > 1 { + return false + } + ptr, ok := fn.Type.Params.List[0].Type.(*ast.StarExpr) + if !ok { + return false + } + // We can't easily check that the type is *testing.M + // because we don't know how testing has been imported, + // but at least check that it's *M or *something.M. + if name, ok := ptr.X.(*ast.Ident); ok && name.Name == "M" { + return true + } + if sel, ok := ptr.X.(*ast.SelectorExpr); ok && sel.Sel.Name == "M" { + return true + } + return false +} + +// isTest tells whether name looks like a test (or benchmark, according to prefix). +// It is a Test (say) if there is a character after Test that is not a lower-case letter. +// We don't want TesticularCancer. +func isTest(name, prefix string) bool { + if !strings.HasPrefix(name, prefix) { + return false + } + if len(name) == len(prefix) { // "Test" is ok + return true + } + rune, _ := utf8.DecodeRuneInString(name[len(prefix):]) + return !unicode.IsLower(rune) +} + +var testmainTmpl = template.Must(template.New("main").Parse(` +package main + +import ( +{{if not .TestMain}} + "os" +{{end}} + "testing" + "testing/internal/testdeps" + +{{if .ImportTest}} + {{if .ExecutesTest}}_test{{else}}_{{end}} {{.Package.ImportPath | printf "%q"}} +{{end -}} +{{- if .ImportXTest -}} + {{if .ExecutesXTest}}_xtest{{else}}_{{end}} {{.Package.ImportPath | printf "%s_test" | printf "%q"}} +{{end}} +) + +var tests = []testing.InternalTest{ +{{- range .Tests}} + {"{{.Name}}", {{.Location}}.{{.Name}}}, +{{- end}} +} + +var benchmarks = []testing.InternalBenchmark{ +{{- range .Benchmarks}} + {"{{.Name}}", {{.Location}}.{{.Name}}}, +{{- end}} +} + +var fuzzTargets = []testing.InternalFuzzTarget{ +{{- range .Fuzz}} + {"{{.Name}}", {{.Location}}.{{.Name}}}, +{{- end}} +} + +var examples = []testing.InternalExample{ +{{- range .Examples }} +{{- if .Executable }} + {"{{.Name}}", {{.Location}}.{{.Name}}, {{.Output | printf "%q"}}, {{.Unordered}}}, +{{- end }} +{{- end }} +} + +func main() { + m := testing.MainStart(testdeps.TestDeps{}, tests, benchmarks, fuzzTargets, examples) +{{with .TestMain}} + {{.Location}}.{{.Name}}(m) +{{else}} + os.Exit(m.Run()) +{{end -}} +} + +`)) diff --git a/internal/testmain/testmain_test.go b/internal/testmain/testmain_test.go new file mode 100644 index 000000000..8e0b268d2 --- /dev/null +++ b/internal/testmain/testmain_test.go @@ -0,0 +1,213 @@ +package testmain_test + +import ( + gobuild "go/build" + "go/token" + "testing" + + "github.com/google/go-cmp/cmp" + "github.com/google/go-cmp/cmp/cmpopts" + + "github.com/gopherjs/gopherjs/build" + "github.com/gopherjs/gopherjs/internal/srctesting" + . "github.com/gopherjs/gopherjs/internal/testmain" +) + +func TestScan(t *testing.T) { + xctx := build.NewBuildContext("", nil) + pkg, err := xctx.Import("github.com/gopherjs/gopherjs/internal/testmain/testdata/testpkg", "", 0) + if err != nil { + t.Fatalf("Failed to import package: %s", err) + } + + fset := token.NewFileSet() + + got := TestMain{ + Package: pkg.Package, + Context: pkg.InternalBuildContext(), + } + if err := got.Scan(fset); err != nil { + t.Fatalf("Got: tm.Scan() returned error: %s. Want: no error.", err) + } + + want := TestMain{ + TestMain: &TestFunc{Location: LocInPackage, Name: "TestMain"}, + Tests: []TestFunc{ + {Location: LocInPackage, Name: "TestXxx"}, + {Location: LocExternal, Name: "TestYyy"}, + }, + Benchmarks: []TestFunc{ + {Location: LocInPackage, Name: "BenchmarkXxx"}, + {Location: LocExternal, Name: "BenchmarkYyy"}, + }, + Fuzz: []TestFunc{ + {Location: LocInPackage, Name: "FuzzXxx"}, + {Location: LocExternal, Name: "FuzzYyy"}, + }, + Examples: []ExampleFunc{ + {Location: LocInPackage, Name: "ExampleXxx"}, + {Location: LocExternal, Name: "ExampleYyy", Output: "hello\n"}, + }, + } + opts := cmp.Options{ + cmpopts.IgnoreFields(TestMain{}, "Package"), // Inputs. + cmpopts.IgnoreFields(TestMain{}, "Context"), + } + if diff := cmp.Diff(want, got, opts...); diff != "" { + t.Errorf("List of test function is different from expected (-want,+got):\n%s", diff) + } +} + +func TestSynthesize(t *testing.T) { + pkg := &gobuild.Package{ImportPath: "foo/bar"} + + tests := []struct { + descr string + tm TestMain + wantSrc string + }{ + { + descr: "all tests", + tm: TestMain{ + Package: pkg, + Tests: []TestFunc{ + {Location: LocInPackage, Name: "TestXxx"}, + {Location: LocExternal, Name: "TestYyy"}, + }, + Benchmarks: []TestFunc{ + {Location: LocInPackage, Name: "BenchmarkXxx"}, + {Location: LocExternal, Name: "BenchmarkYyy"}, + }, + Fuzz: []TestFunc{ + {Location: LocInPackage, Name: "FuzzXxx"}, + {Location: LocExternal, Name: "FuzzYyy"}, + }, + Examples: []ExampleFunc{ + {Location: LocInPackage, Name: "ExampleXxx", EmptyOutput: true}, + {Location: LocExternal, Name: "ExampleYyy", EmptyOutput: true}, + }, + }, + wantSrc: allTests, + }, { + descr: "testmain", + tm: TestMain{ + Package: pkg, + TestMain: &TestFunc{Location: LocInPackage, Name: "TestMain"}, + }, + wantSrc: testmain, + }, { + descr: "import only", + tm: TestMain{ + Package: pkg, + Examples: []ExampleFunc{ + {Location: LocInPackage, Name: "ExampleXxx"}, + }, + }, + wantSrc: importOnly, + }, + } + + for _, test := range tests { + t.Run(test.descr, func(t *testing.T) { + fset := token.NewFileSet() + _, src, err := test.tm.Synthesize(fset) + if err != nil { + t.Fatalf("Got: tm.Synthesize() returned error: %s. Want: no error.", err) + } + got := srctesting.Format(t, fset, src) + if diff := cmp.Diff(test.wantSrc, got); diff != "" { + t.Errorf("Different _testmain.go source (-want,+got):\n%s", diff) + t.Logf("Got source:\n%s", got) + } + }) + } +} + +const allTests = `package main + +import ( + "os" + + "testing" + "testing/internal/testdeps" + + _test "foo/bar" + _xtest "foo/bar_test" +) + +var tests = []testing.InternalTest{ + {"TestXxx", _test.TestXxx}, + {"TestYyy", _xtest.TestYyy}, +} + +var benchmarks = []testing.InternalBenchmark{ + {"BenchmarkXxx", _test.BenchmarkXxx}, + {"BenchmarkYyy", _xtest.BenchmarkYyy}, +} + +var fuzzTargets = []testing.InternalFuzzTarget{ + {"FuzzXxx", _test.FuzzXxx}, + {"FuzzYyy", _xtest.FuzzYyy}, +} + +var examples = []testing.InternalExample{ + {"ExampleXxx", _test.ExampleXxx, "", false}, + {"ExampleYyy", _xtest.ExampleYyy, "", false}, +} + +func main() { + m := testing.MainStart(testdeps.TestDeps{}, tests, benchmarks, fuzzTargets, examples) + + os.Exit(m.Run()) +} +` + +const testmain = `package main + +import ( + "testing" + "testing/internal/testdeps" + + _test "foo/bar" +) + +var tests = []testing.InternalTest{} + +var benchmarks = []testing.InternalBenchmark{} + +var fuzzTargets = []testing.InternalFuzzTarget{} + +var examples = []testing.InternalExample{} + +func main() { + m := testing.MainStart(testdeps.TestDeps{}, tests, benchmarks, fuzzTargets, examples) + + _test.TestMain(m) +} +` + +const importOnly = `package main + +import ( + "os" + + "testing" + "testing/internal/testdeps" + + _ "foo/bar" +) + +var tests = []testing.InternalTest{} + +var benchmarks = []testing.InternalBenchmark{} + +var fuzzTargets = []testing.InternalFuzzTarget{} + +var examples = []testing.InternalExample{} + +func main() { + m := testing.MainStart(testdeps.TestDeps{}, tests, benchmarks, fuzzTargets, examples) + + os.Exit(m.Run()) +} +` diff --git a/js/js.go b/js/js.go index 3fbf1d88c..e4b523275 100644 --- a/js/js.go +++ b/js/js.go @@ -1,26 +1,26 @@ // Package js provides functions for interacting with native JavaScript APIs. Calls to these functions are treated specially by GopherJS and translated directly to their corresponding JavaScript syntax. // -// Use MakeWrapper to expose methods to JavaScript. When passing values directly, the following type conversions are performed: +// Use MakeWrapper to expose methods to JavaScript. Use MakeFullWrapper to expose methods AND fields to JavaScript. When passing values directly, the following type conversions are performed: // -// | Go type | JavaScript type | Conversions back to interface{} | -// | --------------------- | --------------------- | ------------------------------- | -// | bool | Boolean | bool | -// | integers and floats | Number | float64 | -// | string | String | string | -// | []int8 | Int8Array | []int8 | -// | []int16 | Int16Array | []int16 | -// | []int32, []int | Int32Array | []int | -// | []uint8 | Uint8Array | []uint8 | -// | []uint16 | Uint16Array | []uint16 | -// | []uint32, []uint | Uint32Array | []uint | -// | []float32 | Float32Array | []float32 | -// | []float64 | Float64Array | []float64 | -// | all other slices | Array | []interface{} | -// | arrays | see slice type | see slice type | -// | functions | Function | func(...interface{}) *js.Object | -// | time.Time | Date | time.Time | -// | - | instanceof Node | *js.Object | -// | maps, structs | instanceof Object | map[string]interface{} | +// | Go type | JavaScript type | Conversions back to interface{} | +// | --------------------- | --------------------- | ------------------------------- | +// | bool | Boolean | bool | +// | integers and floats | Number | float64 | +// | string | String | string | +// | []int8 | Int8Array | []int8 | +// | []int16 | Int16Array | []int16 | +// | []int32, []int | Int32Array | []int | +// | []uint8 | Uint8Array | []uint8 | +// | []uint16 | Uint16Array | []uint16 | +// | []uint32, []uint | Uint32Array | []uint | +// | []float32 | Float32Array | []float32 | +// | []float64 | Float64Array | []float64 | +// | all other slices | Array | []interface{} | +// | arrays | see slice type | see slice type | +// | functions | Function | func(...interface{}) *js.Object | +// | time.Time | Date | time.Time | +// | - | instanceof Node | *js.Object | +// | maps, structs | instanceof Object | map[string]interface{} | // // Additionally, for a struct containing a *js.Object field, only the content of the field will be passed to JavaScript and vice versa. package js @@ -97,7 +97,13 @@ func (err *Error) Stack() string { // Global gives JavaScript's global object ("window" for browsers and "GLOBAL" for Node.js). var Global *Object -// Module gives the value of the "module" variable set by Node.js. Hint: Set a module export with 'js.Module.Get("exports").Set("exportName", ...)'. +// Module gives the value of the "module" variable set by Node.js. Hint: Set a +// module export with 'js.Module.Get("exports").Set("exportName", ...)'. +// +// Note that js.Module is only defined in runtimes which support CommonJS +// modules (https://nodejs.org/api/modules.html). NodeJS supports it natively, +// but in browsers it can only be used if GopherJS output is passed through a +// bundler which implements CommonJS (for example, webpack or esbuild). var Module *Object // Undefined gives the JavaScript value "undefined". @@ -147,6 +153,99 @@ func MakeWrapper(i interface{}) *Object { return o } +// MakeFullWrapper creates a JavaScript object which has wrappers for the exported +// methods of i, and, where i is a (pointer to a) struct value, wrapped getters +// and setters +// (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty) +// for the non-embedded exported fields of i. Values accessed via these methods +// and getters are themselves wrapped when accessed, but an important point to +// note is that a new wrapped value is created on each access. +func MakeFullWrapper(i interface{}) *Object { + internalObj := InternalObject(i) + constructor := internalObj.Get("constructor") + + wrapperObj := Global.Get("Object").New() + + defineProperty := func(key string, descriptor M) { + Global.Get("Object").Call("defineProperty", wrapperObj, key, descriptor) + } + + defineProperty("__internal_object__", M{ + "value": internalObj, + }) + + { + // Calculate a sensible type string. + + // We don't want to import any packages in this package, + // so we do some string operations by hand. + + typ := constructor.Get("string").String() + pkg := constructor.Get("pkg").String() + + ptr := "" + if typ[0] == '*' { + ptr = "*" + } + + for i := 0; i < len(typ); i++ { + if typ[i] == '.' { + typ = typ[i+1:] + break + } + } + + pkgTyp := pkg + "." + ptr + typ + defineProperty("$type", M{ + "value": pkgTyp, + }) + } + + var fields *Object + methods := Global.Get("Array").New() + if ms := constructor.Get("methods"); ms != Undefined { + methods = methods.Call("concat", ms) + } + // If we are a pointer value then add fields from element, + // else the constructor itself will have them. + if e := constructor.Get("elem"); e != Undefined { + fields = e.Get("fields") + methods = methods.Call("concat", e.Get("methods")) + } else { + fields = constructor.Get("fields") + } + for i := 0; i < methods.Length(); i++ { + m := methods.Index(i) + if m.Get("pkg").String() != "" { // not exported + continue + } + defineProperty(m.Get("prop").String(), M{ + "value": func(args ...*Object) *Object { + return Global.Call("$externalizeFunction", internalObj.Get(m.Get("prop").String()), m.Get("typ"), true, InternalObject(MakeFullWrapper)).Call("apply", internalObj, args) + }, + }) + } + if fields != Undefined { + for i := 0; i < fields.Length(); i++ { + f := fields.Index(i) + if !f.Get("exported").Bool() { + continue + } + defineProperty(f.Get("prop").String(), M{ + "get": func() *Object { + vc := Global.Call("$copyIfRequired", internalObj.Get("$val").Get(f.Get("prop").String()), f.Get("typ")) + return Global.Call("$externalize", vc, f.Get("typ"), InternalObject(MakeFullWrapper)) + }, + "set": func(jv *Object) { + gv := Global.Call("$internalize", jv, f.Get("typ"), InternalObject(MakeFullWrapper)) + internalObj.Get("$val").Set(f.Get("prop").String(), gv) + }, + }) + } + } + return wrapperObj +} + // NewArrayBuffer creates a JavaScript ArrayBuffer from a byte slice. func NewArrayBuffer(b []byte) *Object { slice := InternalObject(b) @@ -162,7 +261,7 @@ type M map[string]interface{} type S []interface{} func init() { - // avoid dead code elimination + // Avoid dead code elimination. e := Error{} _ = e } diff --git a/js/js_test.go b/js/js_test.go new file mode 100644 index 000000000..d7a904954 --- /dev/null +++ b/js/js_test.go @@ -0,0 +1,19 @@ +//go:build js +// +build js + +package js_test + +import ( + "testing" + + "github.com/gopherjs/gopherjs/js" +) + +func TestInternalizeCircularReference(t *testing.T) { + // See https://github.com/gopherjs/gopherjs/issues/968. + js.Global.Call("eval", ` + var issue968a = {}; + var issue968b = {'a': issue968a}; + issue968a.b = issue968b;`) + _ = js.Global.Get("issue968a").Interface() +} diff --git a/node-syscall/.gitignore b/node-syscall/.gitignore new file mode 100644 index 000000000..c2658d7d1 --- /dev/null +++ b/node-syscall/.gitignore @@ -0,0 +1 @@ +node_modules/ diff --git a/node-syscall/index.js b/node-syscall/index.js new file mode 100644 index 000000000..1e956d2a0 --- /dev/null +++ b/node-syscall/index.js @@ -0,0 +1 @@ +module.exports = require('./build/Release/syscall') diff --git a/node-syscall/package-lock.json b/node-syscall/package-lock.json new file mode 100644 index 000000000..df06938c6 --- /dev/null +++ b/node-syscall/package-lock.json @@ -0,0 +1,926 @@ +{ + "name": 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9f6469c07..be4fb786d 100644 --- a/node-syscall/syscall.cc +++ b/node-syscall/syscall.cc @@ -7,30 +7,25 @@ #include #include #include +#include using namespace v8; -#if NODE_MAJOR_VERSION == 0 -#define ARRAY_BUFFER_DATA_OFFSET 23 -#else -#define ARRAY_BUFFER_DATA_OFFSET 31 -#endif - // arena stores buffers we allocate for data passed to syscalls. // // This object lives for the duration of Syscall() or Syscall6() and correctly // frees all allocated buffers at the end. This is necessary to avoid memory // leaks on each call. class arena { - std::vector> allocs_; + std::vector> allocs_; public: arena() = default; virtual ~arena() = default; arena(const arena& a) = delete; - intptr_t* allocate(size_t n) { - allocs_.emplace_back(new intptr_t[n]); - return allocs_.end()->get(); + void* allocate(size_t n) { + allocs_.emplace_back(n); // Allocate a new vector of n byte size. + return allocs_[allocs_.size() - 1].data(); // Return the pointer to its data buffer; } }; @@ -46,17 +41,20 @@ Local integerOrDie(Local ctx, Local value) { throw std::runtime_error("expected integer, got something else"); } +// Transforms a JS value into a native value that can be passed to the syscall() call. intptr_t toNative(Local ctx, arena& a, Local value) { if (value.IsEmpty()) { return 0; } if (value->IsArrayBufferView()) { Local view = Local::Cast(value); - return *reinterpret_cast(*reinterpret_cast(*view->Buffer()) + ARRAY_BUFFER_DATA_OFFSET) + view->ByteOffset(); // ugly hack, because of https://codereview.chromium.org/25221002 + void* native = a.allocate(view->ByteLength()); + view->CopyContents(native, view->ByteLength()); + return reinterpret_cast(native); } if (value->IsArray()) { Local array = Local::Cast(value); - intptr_t* native = a.allocate(array->Length()); + intptr_t* native = reinterpret_cast(a.allocate(array->Length() * sizeof(intptr_t))); for (uint32_t i = 0; i < array->Length(); i++) { native[i] = toNative(ctx, a, array->Get(ctx, i).ToLocalChecked()); } @@ -142,9 +140,10 @@ void Syscall6(const FunctionCallbackInfo& info) { } } -void init(Local exports) { +extern "C" NODE_MODULE_EXPORT void +NODE_MODULE_INITIALIZER(Local exports, + Local module, + Local context) { NODE_SET_METHOD(exports, "Syscall", Syscall); NODE_SET_METHOD(exports, "Syscall6", Syscall6); } - -NODE_MODULE(syscall, init); diff --git a/nosync/mutex.go b/nosync/mutex.go index 03f20dc40..d988e8ffa 100644 --- a/nosync/mutex.go +++ b/nosync/mutex.go @@ -3,6 +3,10 @@ package nosync // Mutex is a dummy which is non-blocking. type Mutex struct { locked bool + _ bool + _ bool + _ bool + _ uint32 } // Lock locks m. It is a run-time error if m is already locked. @@ -23,8 +27,14 @@ func (m *Mutex) Unlock() { // RWMutex is a dummy which is non-blocking. type RWMutex struct { + _ Mutex writeLocked bool - readLockCounter int + _ bool + _ bool + _ bool + readLockCounter int32 + _ int32 + _ int32 } // Lock locks m for writing. It is a run-time error if rw is already locked for reading or writing. diff --git a/nosync/once.go b/nosync/once.go index f4cb69540..2af58f873 100644 --- a/nosync/once.go +++ b/nosync/once.go @@ -8,7 +8,9 @@ type Once struct { // Do calls the function f if and only if Do is being called for the // first time for this instance of Once. In other words, given -// var once Once +// +// var once Once +// // if once.Do(f) is called multiple times, only the first call will invoke f, // even if f has a different value in each invocation. A new instance of // Once is required for each function to execute. @@ -16,13 +18,13 @@ type Once struct { // Do is intended for initialization that must be run exactly once. Since f // is niladic, it may be necessary to use a function literal to capture the // arguments to a function to be invoked by Do: -// config.once.Do(func() { config.init(filename) }) +// +// config.once.Do(func() { config.init(filename) }) // // If f causes Do to be called, it will panic. // // If f panics, Do considers it to have returned; future calls of Do return // without calling f. -// func (o *Once) Do(f func()) { if o.done { return diff --git a/nosync/pool.go b/nosync/pool.go index 3d448e0fc..ae792b642 100644 --- a/nosync/pool.go +++ b/nosync/pool.go @@ -28,7 +28,6 @@ package nosync // not a suitable use for a Pool, since the overhead does not amortize well in // that scenario. It is more efficient to have such objects implement their own // free list. -// type Pool struct { store []interface{} New func() interface{} diff --git a/package-lock.json b/package-lock.json index ed79b7a9b..b8ba5e000 100644 --- a/package-lock.json +++ b/package-lock.json @@ -1,28 +1,1021 @@ { "name": "gopherjs", + "lockfileVersion": 3, "requires": true, - "lockfileVersion": 1, - "dependencies": { - "commander": { - "version": "2.13.0", - "resolved": "https://registry.npmjs.org/commander/-/commander-2.13.0.tgz", - "integrity": "sha512-MVuS359B+YzaWqjCL/c+22gfryv+mCBPHAv3zyVI2GN8EY6IRP8VwtasXn8jyyhvvq84R4ImN1OKRtcbIasjYA==", - "dev": true - }, - "source-map": { - "version": "0.6.1", - "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz", - "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==", - "dev": true - }, - "uglify-es": { - "version": "3.3.9", - "resolved": 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+1,85 @@ +package tests + +import ( + "reflect" + "testing" + "unsafe" +) + +func TestArrayPointer(t *testing.T) { + t.Run("nil", func(t *testing.T) { + var p1 *[1]int + if p1 != nil { + t.Errorf("Zero-value array pointer is not equal to nil: %v", p1) + } + + var p2 *[1]int = nil + if p2 != nil { + t.Errorf("Nil array pointer is not equal to nil: %v", p2) + } + + p3 := func() *[1]int { return nil }() + if p3 != nil { + t.Errorf("Nil array pointer returned from function is not equal to nil: %v", p3) + } + + if p1 != p3 || p1 != p2 || p2 != p3 { + t.Errorf("Nil pointers are not equal to each other: %v %v %v", p1, p2, p3) + } + + if v := reflect.ValueOf(p1); !v.IsNil() { + t.Errorf("reflect.Value.IsNil() is false for a nil pointer: %v %v", p1, v) + } + + type arr *[1]int + var p4 arr = nil + + if v := reflect.ValueOf(p4); !v.IsNil() { + t.Errorf("reflect.Value.IsNil() is false for a nil pointer: %v %v", p4, v) + } + }) + + t.Run("pointer-dereference", func(t *testing.T) { + a1 := [1]int{42} + aPtr := &a1 + a2 := *aPtr + if !reflect.DeepEqual(a1, a2) { + t.Errorf("Array after pointer dereferencing is not equal to the original: %v != %v", a1, a2) + t.Logf("Pointer: %v", aPtr) + } + }) + + t.Run("interface-and-back", func(t *testing.T) { + type arr *[1]int + tests := []struct { + name string + a arr + }{{ + name: "not nil", + a: &[1]int{42}, + }, { + name: "nil", + a: nil, + }} + for _, test := range tests { + a1 := test.a + i := interface{}(a1) + a2 := i.(arr) + + if a1 != a2 { + t.Errorf("Array pointer is not equal to itself after interface conversion: %v != %v", a1, a2) + println(a1, a2) + } + } + }) + + t.Run("reflect.IsNil", func(t *testing.T) { + }) +} + +func TestReflectArraySize(t *testing.T) { + want := unsafe.Sizeof(int(0)) * 8 + if got := reflect.TypeOf([8]int{}).Size(); got != want { + t.Errorf("array type size gave %v, want %v", got, want) + } +} diff --git a/tests/compiler_test.go b/tests/compiler_test.go new file mode 100644 index 000000000..7c72e3535 --- /dev/null +++ b/tests/compiler_test.go @@ -0,0 +1,54 @@ +package tests + +import ( + "testing" +) + +func TestVariadicNil(t *testing.T) { + t.Run("only variadic", func(t *testing.T) { + printVari := func(strs ...string) []string { + return strs + } + + if got := printVari(); got != nil { + t.Errorf("printVari(): got: %#v; want %#v.", got, nil) + } + + { + var want []string + if got := printVari(want...); got != nil { + t.Errorf("printVari(want...): got: %#v; want %#v.", got, nil) + } + } + + { + want := []string{} + if got := printVari(want...); got == nil || len(got) != len(want) { + t.Errorf("printVari(want...): got: %#v; want %#v.", got, want) + } + } + }) + t.Run("mixed", func(t *testing.T) { + printVari := func(_ int, strs ...string) []string { + return strs + } + + if got := printVari(0); got != nil { + t.Errorf("printVari(): got: %#v; want %#v.", got, nil) + } + + { + var want []string + if got := printVari(0, want...); got != nil { + t.Errorf("printVari(want...): got: %#v; want %#v.", got, nil) + } + } + + { + want := []string{} + if got := printVari(0, want...); got == nil || len(got) != len(want) { + t.Errorf("printVari(want...): got: %#v; want %#v.", got, want) + } + } + }) +} diff --git a/tests/copy_test.go b/tests/copy_test.go index c03a3a83c..866b554b4 100644 --- a/tests/copy_test.go +++ b/tests/copy_test.go @@ -1,6 +1,7 @@ package tests import ( + "reflect" "testing" ) @@ -124,10 +125,24 @@ func (t T) M() int { } func TestExplicitConversion(t *testing.T) { - var coolGuy = S{x: 42} + coolGuy := S{x: 42} var i I i = T(coolGuy) if i.M() != 42 { t.Fail() } } + +func TestCopyStructByReflect(t *testing.T) { + // https://github.com/gopherjs/gopherjs/issues/1156 + type Info struct { + name string + } + a := []Info{{"A"}, {"B"}, {"C"}} + v := reflect.ValueOf(a) + i := v.Index(0).Interface() + a[0] = Info{"X"} + if got := i.(Info).name; got != "A" { + t.Fatalf(`bad copy struct got %q, want "A"`, got) + } +} diff --git a/tests/deferblock_test.go b/tests/deferblock_test.go index 89fe0c9c6..3443b936f 100644 --- a/tests/deferblock_test.go +++ b/tests/deferblock_test.go @@ -1,6 +1,8 @@ package tests import ( + "errors" + "fmt" "testing" "time" ) @@ -40,3 +42,75 @@ func TestBlockingInDefer(t *testing.T) { outer(ch, b) } + +func TestIssue1083(t *testing.T) { + // https://github.com/gopherjs/gopherjs/issues/1083 + block := make(chan bool) + + recoverCompleted := false + + recoverAndBlock := func() { + defer func() {}() + recover() + block <- true + recoverCompleted = true + } + + handle := func() { + defer func() {}() + panic("expected panic") + } + + serve := func() { + defer recoverAndBlock() + handle() + t.Fatal("This line must never execute.") + } + + go func() { <-block }() + + serve() + if !recoverCompleted { + t.Fatal("Recovery function did not execute fully.") + } +} + +func TestIssue780(t *testing.T) { + // https://github.com/gopherjs/gopherjs/issues/780 + want := errors.New("expected error") + var got error + + catch := func() { + if r := recover(); r != nil { + got = r.(error) + } + } + throw := func() { panic(want) } + + catchAndThrow := func() { + t.Logf("catchAndThrow: %v", recover()) + panic(want) + } + + execute := func(x int) (err error) { + defer catch() // Final recovery. + + for i := 0; i < x; i++ { + // Test that several deferred panics can be handled. + defer catchAndThrow() + } + + defer throw() // Emulates a panicing cleanup. + + return nil + } + + for _, x := range []int{0, 1, 2, 5, 10} { + t.Run(fmt.Sprint(x), func(t *testing.T) { + execute(x) + if !errors.Is(got, want) { + t.Errorf("process() returned error %v, want %v", got, want) + } + }) + } +} diff --git a/tests/gopherjsvendored_test.sh b/tests/gopherjsvendored_test.sh index a9ef4105f..2fd94afd2 100755 --- a/tests/gopherjsvendored_test.sh +++ b/tests/gopherjsvendored_test.sh @@ -37,9 +37,17 @@ func main() { for pkg in $(go list -f '{{if not .Goroot}}{{.ImportPath}}{{end}}' $(go list -f '{{.ImportPath}} {{join .Deps " "}}' github.com/gopherjs/gopherjs)); do copyGoPackage "$pkg" "$tmp/src/example.org/hello/vendor/$pkg" done +# Two special cases +for pkg in "github.com/gopherjs/gopherjs/js" "github.com/gopherjs/gopherjs/nosync"; do + copyGoPackage "$pkg" "$tmp/src/example.org/hello/vendor/$pkg" +done + +cp -r "$(go list -f '{{.Dir}}' 'github.com/gopherjs/gopherjs/compiler/natives')/src" \ + "$tmp/src/example.org/hello/vendor/github.com/gopherjs/gopherjs/compiler/natives/src" # Make $tmp our GOPATH workspace. export GOPATH="$tmp" +export GO111MODULE=off # Build the vendored copy of GopherJS. go install example.org/hello/vendor/github.com/gopherjs/gopherjs diff --git a/tests/gorepo/gorepo_test.go b/tests/gorepo/gorepo_test.go new file mode 100644 index 000000000..5ab93e9af --- /dev/null +++ b/tests/gorepo/gorepo_test.go @@ -0,0 +1,31 @@ +package gorepo_test + +import ( + "os" + "os/exec" + "runtime" + "testing" +) + +// Go repository basic compiler tests, and regression tests for fixed compiler bugs. +func TestGoRepositoryCompilerTests(t *testing.T) { + if testing.Short() { + t.Skip("skipping Go repository tests in the short mode") + } + if runtime.GOOS == "js" { + t.Skip("test meant to be run using normal Go compiler (needs os/exec)") + } + + args := []string{"go", "run", "run.go", "-summary"} + if testing.Verbose() { + args = append(args, "-v") + } + + cmd := exec.Command(args[0], args[1:]...) + cmd.Stdout = os.Stdout + cmd.Stderr = os.Stdout + err := cmd.Run() + if err != nil { + t.Fatal(err) + } +} diff --git a/tests/run.go b/tests/gorepo/run.go similarity index 77% rename from tests/run.go rename to tests/gorepo/run.go index 6968359b3..6720f50d7 100644 --- a/tests/run.go +++ b/tests/gorepo/run.go @@ -1,3 +1,4 @@ +//go:build ignore // +build ignore // skip @@ -10,7 +11,7 @@ // // To run manually with summary, verbose output, and full stack traces of of known failures: // -// go run run.go -summary -v -show_known_fails +// go run run.go -summary -v -show_known_fails // // TODO(bradfitz): docs of some sort, once we figure out how we're changing // headers of files @@ -21,9 +22,9 @@ import ( "errors" "flag" "fmt" + "go/build/constraint" "hash/fnv" "io" - "io/ioutil" "log" "os" "os/exec" @@ -44,7 +45,6 @@ import ( // GOPHERJS: Known test fails for GopherJS compiler. // // TODO: Reduce these to zero or as close as possible. -// var knownFails = map[string]failReason{ "fixedbugs/bug114.go": {desc: "fixedbugs/bug114.go:15:27: B32 (untyped int constant 4294967295) overflows int"}, "fixedbugs/bug242.go": {desc: "bad map check 13 false false Error: fail"}, @@ -57,7 +57,6 @@ var knownFails = map[string]failReason{ "fixedbugs/bug352.go": {desc: "BUG: bug352 struct{}"}, "fixedbugs/bug409.go": {desc: "1 2 3 4"}, "fixedbugs/bug433.go": {desc: "Error: [object Object]"}, - "fixedbugs/issue10353.go": {desc: "incorrect output"}, "fixedbugs/issue11656.go": {desc: "Error: Native function not implemented: runtime/debug.setPanicOnFault"}, "fixedbugs/issue4085b.go": {desc: "Error: got panic JavaScript error: Invalid typed array length, want len out of range"}, "fixedbugs/issue4316.go": {desc: "Error: runtime error: invalid memory address or nil pointer dereference"}, @@ -66,9 +65,8 @@ var knownFails = map[string]failReason{ "fixedbugs/issue4620.go": {desc: "map[0:1 1:2], Error: m[i] != 2"}, "fixedbugs/issue5856.go": {category: requiresSourceMapSupport}, "fixedbugs/issue6899.go": {desc: "incorrect output -0"}, - "fixedbugs/issue7550.go": {desc: "FATAL ERROR: invalid table size Allocation failed - process out of memory"}, + "fixedbugs/issue7550.go": {category: neverTerminates, desc: "FATAL ERROR: invalid table size Allocation failed - process out of memory"}, "fixedbugs/issue7690.go": {desc: "Error: runtime error: slice bounds out of range"}, - "fixedbugs/issue8047.go": {desc: "null"}, "fixedbugs/issue8047b.go": {desc: "Error: [object Object]"}, // Failing due to use of os/exec.Command, which is unsupported. Now skipped via !nacl build tag. @@ -86,7 +84,6 @@ var knownFails = map[string]failReason{ "fixedbugs/issue14646.go": {category: unsureIfGopherJSSupportsThisFeature, desc: "tests runtime.Caller behavior in a deferred func in SSA backend... does GopherJS even support runtime.Caller?"}, "fixedbugs/issue15039.go": {desc: "valid bug but deal with after Go 1.7 support is out? it's likely not a regression"}, "fixedbugs/issue15281.go": {desc: "also looks valid but deal with after Go 1.7 support is out? it's likely not a regression"}, - "fixedbugs/issue15975.go": {desc: "also looks valid but deal with after Go 1.7 support is out?"}, // These are new tests in Go 1.8. "fixedbugs/issue17381.go": {category: unsureIfGopherJSSupportsThisFeature, desc: "tests runtime.{Callers,FuncForPC} behavior in a deferred func with garbage on stack... does GopherJS even support runtime.{Callers,FuncForPC}?"}, @@ -103,7 +100,6 @@ var knownFails = map[string]failReason{ // These are new tests in Go 1.10. "fixedbugs/issue21879.go": {desc: "incorrect output related to runtime.Callers, runtime.CallersFrames, etc."}, "fixedbugs/issue21887.go": {desc: "incorrect output (although within spec, not worth fixing) for println(^uint64(0)). got: { '$high': 4294967295, '$low': 4294967295, '$val': [Circular] } want: 18446744073709551615"}, - "fixedbugs/issue22083.go": {category: requiresSourceMapSupport}, // Technically, added in Go 1.9.2. "fixedbugs/issue22660.go": {category: notApplicable, desc: "test of gc compiler, uses os/exec.Command"}, "fixedbugs/issue23305.go": {desc: "GopherJS fails to compile println(0xffffffff), maybe because 32-bit arch"}, @@ -114,19 +110,58 @@ var knownFails = map[string]failReason{ "fixedbugs/issue23188.go": {desc: "incorrect order of evaluation of index operations"}, "fixedbugs/issue24547.go": {desc: "incorrect computing method sets with shadowed methods"}, - // These are new tests in Go 1.11.5 - "fixedbugs/issue28688.go": {category: notApplicable, desc: "testing runtime optimisations"}, - // These are new tests in Go 1.12. "fixedbugs/issue23837.go": {desc: "missing panic on nil pointer-to-empty-struct dereference"}, "fixedbugs/issue27201.go": {desc: "incorrect stack trace for nil dereference in inlined function"}, "fixedbugs/issue27518b.go": {desc: "sigpanic can make dead pointer live again"}, - "fixedbugs/issue29190.go": {desc: "append does not fail when length overflows"}, + "fixedbugs/issue29190.go": {desc: "append does not fail when length overflows", category: neverTerminates}, // These are new tests in Go 1.12.9. "fixedbugs/issue30977.go": {category: neverTerminates, desc: "does for { runtime.GC() }"}, "fixedbugs/issue32477.go": {category: notApplicable, desc: "uses runtime.SetFinalizer and runtime.GC"}, - "fixedbugs/issue32680.go": {category: notApplicable, desc: "uses -gcflags=-d=ssa/check/on flag"}, + + // These are new tests in Go 1.13-1.16. + "fixedbugs/issue19113.go": {category: lowLevelRuntimeDifference, desc: "JavaScript bit shifts by negative amount don't cause an exception"}, + "fixedbugs/issue24491a.go": {category: notApplicable, desc: "tests interaction between unsafe and GC; uses runtime.SetFinalizer()"}, + "fixedbugs/issue24491b.go": {category: notApplicable, desc: "tests interaction between unsafe and GC; uses runtime.SetFinalizer()"}, + "fixedbugs/issue29504.go": {category: notApplicable, desc: "requires source map support beyond what GopherJS currently provides"}, + // This test incorrectly passes because main function's name is returned as "main" and not "main.main". Even number of bugs cancel each other out ¯\_(ツ)_/¯ + // "fixedbugs/issue29735.go": {category: usesUnsupportedPackage, desc: "GopherJS only supports runtime.FuncForPC() with position counters previously returned by runtime.Callers() or runtime.Caller()"}, + "fixedbugs/issue30116.go": {desc: "GopherJS doesn't specify the array/slice index selector in the out-of-bounds message"}, + "fixedbugs/issue30116u.go": {desc: "GopherJS doesn't specify the array/slice index selector in the out-of-bounds message"}, + "fixedbugs/issue34395.go": {category: neverTerminates, desc: "https://github.com/gopherjs/gopherjs/issues/1007"}, + "fixedbugs/issue35027.go": {category: usesUnsupportedPackage, desc: "uses unsupported conversion to reflect.SliceHeader and -gcflags=-d=checkptr"}, + "fixedbugs/issue35576.go": {category: lowLevelRuntimeDifference, desc: "GopherJS print/println format for floats differs from Go's"}, + "fixedbugs/issue40917.go": {category: notApplicable, desc: "uses pointer arithmetic and unsupported flag -gcflags=-d=checkptr"}, + + // These are new tests in Go 1.17 + "fixedbugs/issue45045.go": {category: notApplicable, desc: "GC related, not relevant to GopherJS"}, + "fixedbugs/issue5493.go": {category: notApplicable, desc: "GC related, not relevant to GopherJS"}, + "fixedbugs/issue46725.go": {category: notApplicable, desc: "GC related, not relevant to GopherJS"}, + "fixedbugs/issue43444.go": {category: lowLevelRuntimeDifference, desc: "GopherJS println format is different from Go's"}, + "fixedbugs/issue23017.go": {desc: "https://github.com/gopherjs/gopherjs/issues/1063"}, + + // These are new tests in Go 1.17.8 + "fixedbugs/issue50854.go": {category: lowLevelRuntimeDifference, desc: "negative int32 overflow behaves differently in JS"}, + + // These are new tests in Go 1.18 + "fixedbugs/issue47928.go": {category: notApplicable, desc: "//go:nointerface is a part of GOEXPERIMENT=fieldtrack and is not supported by GopherJS"}, + "fixedbugs/issue48536.go": {category: usesUnsupportedPackage, desc: "https://github.com/gopherjs/gopherjs/issues/1130"}, + "fixedbugs/issue48898.go": {category: other, desc: "https://github.com/gopherjs/gopherjs/issues/1128"}, + "fixedbugs/issue53600.go": {category: lowLevelRuntimeDifference, desc: "GopherJS println format is different from Go's"}, + "typeparam/chans.go": {category: neverTerminates, desc: "uses runtime.SetFinalizer() and runtime.GC()."}, + "typeparam/issue51733.go": {category: usesUnsupportedPackage, desc: "unsafe: uintptr to struct pointer conversion is unsupported"}, + "typeparam/typeswitch5.go": {category: lowLevelRuntimeDifference, desc: "GopherJS println format is different from Go's"}, + + // Failures related to the lack of generics support. Ideally, this section + // should be emptied once https://github.com/gopherjs/gopherjs/issues/1013 is + // fixed. + "typeparam/nested.go": {category: usesUnsupportedGenerics, desc: "incomplete support for generic types inside generic functions"}, + + // These are new tests in Go 1.19 + "typeparam/issue51521.go": {category: lowLevelRuntimeDifference, desc: "different panic message when calling a method on nil interface"}, + "fixedbugs/issue50672.go": {category: other, desc: "https://github.com/gopherjs/gopherjs/issues/1271"}, + "fixedbugs/issue53653.go": {category: lowLevelRuntimeDifference, desc: "GopherJS println format of int64 is different from Go's"}, } type failCategory uint8 @@ -136,9 +171,11 @@ const ( neverTerminates // Test never terminates (so avoid starting it). usesUnsupportedPackage // Test fails because it imports an unsupported package, e.g., "unsafe". requiresSourceMapSupport // Test fails without source map support (as configured in CI), because it tries to check filename/line number via runtime.Caller. + usesUnsupportedGenerics // Test uses generics (type parameters) that are not currently supported. compilerPanic unsureIfGopherJSSupportsThisFeature - notApplicable // Test that doesn't need to run under GopherJS; it doesn't apply to the Go language in a general way. + lowLevelRuntimeDifference // JavaScript runtime behaves differently from Go in ways that are difficult to work around. + notApplicable // Test that doesn't need to run under GopherJS; it doesn't apply to the Go language in a general way. ) type failReason struct { @@ -166,7 +203,7 @@ var ( // dirs are the directories to look for *.go files in. // TODO(bradfitz): just use all directories? - dirs = []string{".", "ken", "chan", "interface", "syntax", "dwarf", "fixedbugs"} + dirs = []string{".", "ken", "chan", "interface", "syntax", "dwarf", "fixedbugs", "typeparam"} // ratec controls the max number of tests running at a time. ratec chan bool @@ -193,22 +230,26 @@ func main() { log.Fatalln(err) } - goos = getenv("GOOS", runtime.GOOS) - //goarch = getenv("GOARCH", runtime.GOARCH) - // GOPHERJS. - goarch = getenv("GOARCH", "js") // We're running this script natively, but the tests are executed with js architecture. - - if *verbose { - fmt.Printf("goos: %q, goarch: %q\n", goos, goarch) - } + // GOPHERJS: We're running this script natively, but the tests are executed with js architecture. + goos = getenv("GOOS", "js") + goarch = getenv("GOARCH", "ecmascript") findExecCmd() - // Disable parallelism if printing or if using a simulator. - if *verbose || len(findExecCmd()) > 0 { + // Disable parallelism if using a simulator. + // Do not disable parallelism in verbose mode, since Go's file IO had internal + // r/w locking, which should make significant output garbling very unlikely. + // GopherJS CI setup runs these tests in verbose mode, but it can benefit from + // parallelism a lot. + if len(findExecCmd()) > 0 { *numParallel = 1 } + if *verbose { + fmt.Printf("goos: %q, goarch: %q\n", goos, goarch) + fmt.Printf("parallel: %d\n", *numParallel) + } + ratec = make(chan bool, *numParallel) rungatec = make(chan bool, *runoutputLimit) @@ -326,6 +367,7 @@ func goFiles(dir string) []string { f, err := os.Open(dir) check(err) dirnames, err := f.Readdirnames(-1) + f.Close() check(err) names := []string{} for _, name := range dirnames { @@ -423,8 +465,8 @@ func (t *test) goDirName() string { return filepath.Join(t.dir, strings.Replace(t.gofile, ".go", ".dir", -1)) } -func goDirFiles(longdir string) (filter []os.FileInfo, err error) { - files, dirErr := ioutil.ReadDir(longdir) +func goDirFiles(longdir string) (filter []os.DirEntry, err error) { + files, dirErr := os.ReadDir(longdir) if dirErr != nil { return nil, dirErr } @@ -447,7 +489,7 @@ func goDirPackages(longdir string) ([][]string, error) { m := make(map[string]int) for _, file := range files { name := file.Name() - data, err := ioutil.ReadFile(filepath.Join(longdir, name)) + data, err := os.ReadFile(filepath.Join(longdir, name)) if err != nil { return nil, err } @@ -480,36 +522,19 @@ func shouldTest(src string, goos, goarch string) (ok bool, whyNot string) { } for _, line := range strings.Split(src, "\n") { - line = strings.TrimSpace(line) - if strings.HasPrefix(line, "//") { - line = line[2:] - } else { - continue - } - line = strings.TrimSpace(line) - if len(line) == 0 || line[0] != '+' { - continue + if strings.HasPrefix(line, "package ") { + break } - ctxt := &context{ - GOOS: goos, - GOARCH: goarch, - } - words := strings.Fields(line) - if words[0] == "+build" { - ok := false - for _, word := range words[1:] { - if ctxt.match(word) { - ok = true - break - } + if expr, err := constraint.Parse(line); err == nil { + ctxt := &context{ + GOOS: goos, + GOARCH: goarch, } - if !ok { - // no matching tag found. + if !expr.Eval(ctxt.match) { return false, line } } } - // no build tags return true, "" } @@ -517,16 +542,6 @@ func (ctxt *context) match(name string) bool { if name == "" { return false } - if i := strings.Index(name, ","); i >= 0 { - // comma-separated list - return ctxt.match(name[:i]) && ctxt.match(name[i+1:]) - } - if strings.HasPrefix(name, "!!") { // bad syntax, reject always - return false - } - if strings.HasPrefix(name, "!") { // negation - return len(name) > 1 && !ctxt.match(name[1:]) - } // Tags must be letters, digits, underscores or dots. // Unlike in Go identifiers, all digits are fine (e.g., "386"). @@ -536,10 +551,18 @@ func (ctxt *context) match(name string) bool { } } + // GOPHERJS: Ignore "goexperiment." for now + // GOPHERJS: Don't match "cgo" since not supported + // GOPHERJS: Don't match "gc" if name == ctxt.GOOS || name == ctxt.GOARCH { return true } + // GOPHERJS: Don't match "gcflags_noopt" + if name == "test_run" { + return true + } + return false } @@ -559,7 +582,7 @@ func (t *test) run() { return } - srcBytes, err := ioutil.ReadFile(t.goFileName()) + srcBytes, err := os.ReadFile(t.goFileName()) if err != nil { t.err = err return @@ -571,26 +594,23 @@ func (t *test) run() { } // Execution recipe stops at first blank line. - pos := strings.Index(t.src, "\n\n") - if pos == -1 { - t.err = errors.New("double newline not found") + action, _, ok := strings.Cut(t.src, "\n\n") + if !ok { + t.err = fmt.Errorf("double newline ending execution recipe not found in %s", t.goFileName()) return } - action := t.src[:pos] - if nl := strings.Index(action, "\n"); nl >= 0 && strings.Contains(action[:nl], "+build") { + if firstLine, rest, ok := strings.Cut(action, "\n"); ok && strings.Contains(firstLine, "+build") { // skip first line - action = action[nl+1:] - } - if strings.HasPrefix(action, "//") { - action = action[2:] + action = rest } + action = strings.TrimPrefix(action, "//") // Check for build constraints only up to the actual code. - pkgPos := strings.Index(t.src, "\npackage") - if pkgPos == -1 { - pkgPos = pos // some files are intentionally malformed + header, _, ok := strings.Cut(t.src, "\npackage") + if !ok { + header = action // some files are intentionally malformed } - if ok, why := shouldTest(t.src[:pkgPos], goos, goarch); !ok { + if ok, why := shouldTest(header, goos, goarch); !ok { t.action = "skip" if *showSkips { fmt.Printf("%-20s %-20s: %s\n", t.action, t.goFileName(), why) @@ -600,16 +620,20 @@ func (t *test) run() { var args, flags []string wantError := false - f := strings.Fields(action) + f, err := splitQuoted(action) + if err != nil { + t.err = fmt.Errorf("invalid test recipe: %v", err) + return + } if len(f) > 0 { action = f[0] args = f[1:] } - // GOPHERJS: For now, only run with "run", "cmpout" actions, in "fixedbugs" dir. Skip all others. + // GOPHERJS: For now, only run with "run", "cmpout" actions, in "fixedbugs" and "typeparam" dirs. Skip all others. switch action { case "run", "cmpout": - if filepath.Clean(t.dir) != "fixedbugs" { + if d := filepath.Clean(t.dir); d != "fixedbugs" && d != "typeparam" { action = "skip" } default: @@ -648,15 +672,28 @@ func (t *test) run() { t.makeTempDir() defer os.RemoveAll(t.tempDir) - err = ioutil.WriteFile(filepath.Join(t.tempDir, t.gofile), srcBytes, 0644) + err = os.WriteFile(filepath.Join(t.tempDir, t.gofile), srcBytes, 0o644) check(err) // A few tests (of things like the environment) require these to be set. if os.Getenv("GOOS") == "" { - os.Setenv("GOOS", runtime.GOOS) + os.Setenv("GOOS", goos) } if os.Getenv("GOARCH") == "" { - os.Setenv("GOARCH", runtime.GOARCH) + os.Setenv("GOARCH", goarch) + } + + { + // GopherJS: we don't support any of -gcflags, but for the most part they + // are not too relevant to the outcome of the test. + supportedArgs := []string{} + for _, a := range args { + if strings.HasPrefix(a, "-gcflags") { + continue + } + supportedArgs = append(supportedArgs, a) + } + args = supportedArgs } useTmp := true @@ -799,7 +836,7 @@ func (t *test) run() { case "run": useTmp = false // GOPHERJS. - out, err := runcmd(append([]string{"gopherjs", "run", "-q", t.goFileName()}, args...)...) + out, err := runcmd(append([]string{"gopherjs", "run", t.goFileName()}, args...)...) if err != nil { t.err = err return @@ -820,7 +857,7 @@ func (t *test) run() { return } tfile := filepath.Join(t.tempDir, "tmp__.go") - if err := ioutil.WriteFile(tfile, out, 0666); err != nil { + if err := os.WriteFile(tfile, out, 0o666); err != nil { t.err = fmt.Errorf("write tempfile:%s", err) return } @@ -841,7 +878,7 @@ func (t *test) run() { return } tfile := filepath.Join(t.tempDir, "tmp__.go") - err = ioutil.WriteFile(tfile, out, 0666) + err = os.WriteFile(tfile, out, 0o666) if err != nil { t.err = fmt.Errorf("write tempfile:%s", err) return @@ -889,7 +926,7 @@ func (t *test) String() string { func (t *test) makeTempDir() { var err error - t.tempDir, err = ioutil.TempDir("", "") + t.tempDir, err = os.MkdirTemp("", "") check(err) } @@ -897,7 +934,7 @@ func (t *test) expectedOutput() string { filename := filepath.Join(t.dir, t.gofile) filename = filename[:len(filename)-len(".go")] filename += ".out" - b, _ := ioutil.ReadFile(filename) + b, _ := os.ReadFile(filename) return string(b) } @@ -989,7 +1026,7 @@ func (t *test) errorCheck(outStr string, fullshort ...string) (err error) { func (t *test) updateErrors(out string, file string) { // Read in source file. - src, err := ioutil.ReadFile(file) + src, err := os.ReadFile(file) if err != nil { fmt.Fprintln(os.Stderr, err) return @@ -1044,7 +1081,7 @@ func (t *test) updateErrors(out string, file string) { } } // Write new file. - err = ioutil.WriteFile(file, []byte(strings.Join(lines, "\n")), 0640) + err = os.WriteFile(file, []byte(strings.Join(lines, "\n")), 0o640) if err != nil { fmt.Fprintln(os.Stderr, err) return @@ -1101,7 +1138,7 @@ var ( func (t *test) wantedErrors(file, short string) (errs []wantedError) { cache := make(map[string]*regexp.Regexp) - src, _ := ioutil.ReadFile(file) + src, _ := os.ReadFile(file) for i, line := range strings.Split(string(src), "\n") { lineNum := i + 1 if strings.Contains(line, "////") { @@ -1223,3 +1260,65 @@ func getenv(key, def string) string { } return def } + +// splitQuoted splits the string s around each instance of one or more consecutive +// white space characters while taking into account quotes and escaping, and +// returns an array of substrings of s or an empty list if s contains only white space. +// Single quotes and double quotes are recognized to prevent splitting within the +// quoted region, and are removed from the resulting substrings. If a quote in s +// isn't closed err will be set and r will have the unclosed argument as the +// last element. The backslash is used for escaping. +// +// For example, the following string: +// +// a b:"c d" 'e''f' "g\"" +// +// Would be parsed as: +// +// []string{"a", "b:c d", "ef", `g"`} +// +// [copied from src/go/build/build.go] +func splitQuoted(s string) (r []string, err error) { + var args []string + arg := make([]rune, len(s)) + escaped := false + quoted := false + quote := '\x00' + i := 0 + for _, rune := range s { + switch { + case escaped: + escaped = false + case rune == '\\': + escaped = true + continue + case quote != '\x00': + if rune == quote { + quote = '\x00' + continue + } + case rune == '"' || rune == '\'': + quoted = true + quote = rune + continue + case unicode.IsSpace(rune): + if quoted || i > 0 { + quoted = false + args = append(args, string(arg[:i])) + i = 0 + } + continue + } + arg[i] = rune + i++ + } + if quoted || i > 0 { + args = append(args, string(arg[:i])) + } + if quote != 0 { + err = errors.New("unclosed quote") + } else if escaped { + err = errors.New("unfinished escaping") + } + return args, err +} diff --git a/tests/goroutine_test.go b/tests/goroutine_test.go index 962a6456a..a1d387263 100644 --- a/tests/goroutine_test.go +++ b/tests/goroutine_test.go @@ -1,9 +1,14 @@ package tests import ( + "context" "fmt" + "runtime" + "sync/atomic" "testing" "time" + + "github.com/gopherjs/gopherjs/js" ) var expectedI int @@ -68,7 +73,7 @@ func testPanic2(t *testing.T) { time.Sleep(0) checkI(t, 4) panic(7) - checkI(t, -3) + checkI(t, -3) //nolint:govet // Unreachable code is intentional for panic test } func TestPanicAdvanced(t *testing.T) { @@ -98,6 +103,50 @@ func testPanicAdvanced2(t *testing.T) { checkI(t, 4) } +func TestPanicIssue1030(t *testing.T) { + throwException := func() { + t.Log("Will throw now...") + js.Global.Call("eval", "throw 'original panic';") + } + + wrapException := func() { + defer func() { + err := recover() + if err == nil { + t.Fatal("Should never happen: no original panic.") + } + t.Log("Got original panic: ", err) + panic("replacement panic") + }() + + throwException() + } + + panicing := false + + expectPanic := func() { + defer func() { + t.Log("No longer panicing.") + panicing = false + }() + defer func() { + err := recover() + if err == nil { + t.Fatal("Should never happen: no wrapped panic.") + } + t.Log("Got wrapped panic: ", err) + }() + + wrapException() + } + + expectPanic() + + if panicing { + t.Fatal("Deferrals were not executed correctly!") + } +} + func TestSelect(t *testing.T) { expectedI = 1 a := make(chan int) @@ -140,3 +189,126 @@ func TestDeferWithBlocking(t *testing.T) { fmt.Print("") return } + +// counter, sideEffect and withBlockingDeferral are defined as top-level symbols +// to make compiler generate simplest code possible without any closures. +var counter = 0 + +func sideEffect() int { + counter++ + return 42 +} + +func withBlockingDeferral() int { + defer time.Sleep(0) + return sideEffect() +} + +func TestReturnWithBlockingDefer(t *testing.T) { + // See: https://github.com/gopherjs/gopherjs/issues/603. + counter = 0 + + got := withBlockingDeferral() + if got != 42 { + t.Errorf("Unexpected return value %v. Want: 42.", got) + } + if counter != 1 { + t.Errorf("Return value was computed %d times. Want: exactly 1.", counter) + } +} + +func BenchmarkGoroutineSwitching(b *testing.B) { + // This benchmark is designed to measure the cost of goroutine switching. + // The two goroutines communicate through an unbuffered channel, which forces + // the control to be passed between them on each iteraction of the benchmark. + // Although the cost of channel operations is also included in the measurement, + // it still allows relative comparison of changes to goroutine scheduling + // performance. + c := make(chan bool) + go func() { + for i := 0; i < b.N; i++ { + c <- true + } + close(c) + }() + + b.ResetTimer() + count := 0 + for range c { + count++ + } +} + +func TestEventLoopStarvation(t *testing.T) { + // See: https://github.com/gopherjs/gopherjs/issues/1078. + c := make(chan bool) + ctx, cancel := context.WithCancel(context.Background()) + go func() { + time.Sleep(100 * time.Millisecond) + cancel() + }() + go func() { + for { + select { + case c <- true: + case <-ctx.Done(): + return + } + } + }() + go func() { + for { + select { + case <-c: + case <-ctx.Done(): + return + } + } + }() + <-ctx.Done() +} + +func TestGoroutineBuiltin(t *testing.T) { + // Test that a built-in function can be a goroutine body. + // https://github.com/gopherjs/gopherjs/issues/547. + c := make(chan bool) + go close(c) + <-c // Wait until goroutine executes successfully. +} + +func TestGoroutineJsObject(t *testing.T) { + // Test that js.Object methods can be a goroutine body. + // https://github.com/gopherjs/gopherjs/issues/547. + if !(runtime.GOOS == "js" || runtime.GOARCH == "js") { + t.Skip("Test requires GopherJS") + } + o := js.Global.Get("Object").New() + go o.Set("x", "y") + // Wait until the goroutine executes successfully. Can't use locks here + // because goroutine body must be a bare js.Object method call. + for o.Get("x").String() != "y" { + runtime.Gosched() + } +} + +func issue1106() { + select { + default: + } +} + +func TestIssue1106(t *testing.T) { + // https://github.com/gopherjs/gopherjs/issues/1106#issuecomment-1046323374 + var done int32 = 0 + go func() { + f := issue1106 + f() + atomic.AddInt32(&done, 1) + }() + + // Will get stuck here if #1106 is not fixed. + for !atomic.CompareAndSwapInt32(&done, 1, 1) { + // Maintain one active goroutine to prevent Node from exiting. + runtime.Gosched() + } +} diff --git a/tests/js_test.go b/tests/js_test.go index a51ee2767..6f6eaa542 100644 --- a/tests/js_test.go +++ b/tests/js_test.go @@ -1,4 +1,5 @@ -// +build js +//go:build js && !wasm +// +build js,!wasm package tests_test @@ -9,6 +10,7 @@ import ( "testing" "time" + "github.com/google/go-cmp/cmp" "github.com/gopherjs/gopherjs/js" ) @@ -293,7 +295,7 @@ func TestDate(t *testing.T) { // https://github.com/gopherjs/gopherjs/issues/287 func TestInternalizeDate(t *testing.T) { - var a = time.Unix(0, (123 * time.Millisecond).Nanoseconds()) + a := time.Unix(0, (123 * time.Millisecond).Nanoseconds()) var b time.Time js.Global.Set("internalizeDate", func(t time.Time) { b = t }) js.Global.Call("eval", "(internalizeDate(new Date(123)))") @@ -302,6 +304,100 @@ func TestInternalizeDate(t *testing.T) { } } +func TestInternalizeStruct(t *testing.T) { + type Person struct { + Name string + Age int + } + var a, expected Person + expected = Person{Name: "foo", Age: 952} + + js.Global.Set("return_person", func(p *Person) *Person { + if p == nil { + t.Fail() + return nil + } + a = *p + return p + }) + + js.Global.Call("eval", "return_person({Name: 'foo', Age: 952})") + if diff := cmp.Diff(a, expected); diff != "" { + t.Errorf("Mismatch (-want +got):\n%s", diff) + } +} + +func TestInternalizeStructUnexportedFields(t *testing.T) { + type Person struct { + Name string + age int + } + var a, expected Person + expected = Person{Name: "foo", age: 0} + js.Global.Set("return_person", func(p *Person) *Person { + a = *p + return p + }) + + js.Global.Call("eval", "return_person({Name: 'foo', age: 952})") + + // Manually check unexported fields + if a.age != expected.age { + t.Errorf("Mismatch in age: got %v, want %v", a.age, expected.age) + } + + // Check exported fields using cmp.Diff + if diff := cmp.Diff(a.Name, expected.Name); diff != "" { + t.Errorf("Mismatch in Name (-want +got):\n%s", diff) + } +} + +func TestInternalizeStructNested(t *testing.T) { + type FullName struct { + FirstName string + LastName string + } + type Person struct { + Name string + Age int + F FullName + } + var a, expected Person + expected = Person{Name: "foo", Age: 952, F: FullName{FirstName: "John", LastName: "Doe"}} + + js.Global.Set("return_person", func(p *Person) *Person { + a = *p + return p + }) + + js.Global.Call("eval", "return_person({Name: 'foo', Age: 952, F: {FirstName: 'John', LastName: 'Doe'}})") + if diff := cmp.Diff(a, expected); diff != "" { + t.Errorf("Mismatch (-want +got):\n%s", diff) + } +} + +func TestInternalizeArrayOfStructs(t *testing.T) { + type Person struct { + Name string + Age int + } + type ArrayOfStructs struct { + People []Person + } + var a, expected ArrayOfStructs + expected = ArrayOfStructs{People: []Person{{Name: "Alice", Age: 30}, {Name: "Bob", Age: 40}}} + + js.Global.Set("return_people_array", func(p ArrayOfStructs) ArrayOfStructs { + a = p + return p + }) + + js.Global.Call("eval", `return_people_array({People: [{Name: "Alice", Age: 30}, {Name: "Bob", Age: 40}]})`) + if diff := cmp.Diff(a, expected); diff != "" { + t.Errorf("Mismatch (-want +got):\n%s", diff) + } +} + func TestEquality(t *testing.T) { if js.Global.Get("Array") != js.Global.Get("Array") || js.Global.Get("Array") == js.Global.Get("String") { t.Fail() @@ -391,6 +487,14 @@ type F struct { Field int } +func (f F) NonPoint() int { + return 10 +} + +func (f *F) Point() int { + return 20 +} + func TestExternalizeField(t *testing.T) { if dummys.Call("testField", map[string]int{"Field": 42}).Int() != 42 { t.Fail() @@ -423,7 +527,12 @@ func TestMakeFunc(t *testing.T) { } type M struct { - f int + Struct F + Pointer *F + Array [1]F + Slice []*F + Name string + f int } func (m *M) Method(a interface{}) map[string]string { @@ -435,8 +544,28 @@ func (m *M) Method(a interface{}) map[string]string { } } +func (m *M) GetF() F { + return m.Struct +} + +func (m *M) GetFPointer() *F { + return m.Pointer +} + +func (m *M) ParamMethod(v *M) string { + return v.Name +} + +func (m *M) Field() string { + return "rubbish" +} + +func (m M) NonPointField() string { + return "sensible" +} + func TestMakeWrapper(t *testing.T) { - m := &M{42} + m := &M{f: 42} if !js.Global.Call("eval", `(function(m) { return m.Method({x: 1})["y"] === "z"; })`).Invoke(js.MakeWrapper(m)).Bool() { t.Fail() } @@ -444,13 +573,140 @@ func TestMakeWrapper(t *testing.T) { if js.MakeWrapper(m).Interface() != m { t.Fail() } +} +func TestMakeFullWrapperType(t *testing.T) { + m := &M{f: 42} f := func(m *M) { if m.f != 42 { t.Fail() } } - js.Global.Call("eval", `(function(f, m) { f(m); })`).Invoke(f, js.MakeWrapper(m)) + + js.Global.Call("eval", `(function(f, m) { f(m); })`).Invoke(f, js.MakeFullWrapper(m)) + want := "github.com/gopherjs/gopherjs/tests_test.*M" + if got := js.MakeFullWrapper(m).Get("$type").String(); got != want { + t.Errorf("wanted type string %q; got %q", want, got) + } +} + +func TestMakeFullWrapperGettersAndSetters(t *testing.T) { + f := &F{Field: 50} + m := &M{ + Name: "Gopher", + Struct: F{Field: 42}, + Pointer: f, + Array: [1]F{{Field: 42}}, + Slice: []*F{f}, + } + + const globalVar = "TestMakeFullWrapper_w1" + + eval := func(s string, v ...interface{}) *js.Object { + return js.Global.Call("eval", s).Invoke(v...) + } + call := func(s string, v ...interface{}) *js.Object { + return eval(fmt.Sprintf(`(function(g) { return g["%v"]%v; })`, globalVar, s), js.Global).Invoke(v...) + } + get := func(s string) *js.Object { + return eval(fmt.Sprintf(`(function(g) { return g["%v"]%v; })`, globalVar, s), js.Global) + } + set := func(s string, v interface{}) { + eval(fmt.Sprintf(`(function(g, v) { g["%v"]%v = v; })`, globalVar, s), js.Global, v) + } + + w1 := js.MakeFullWrapper(m) + { + w2 := js.MakeFullWrapper(m) + + // we expect that MakeFullWrapper produces a different value each time + if eval(`(function(o, p) { return o === p; })`, w1, w2).Bool() { + t.Fatalf("w1 equalled w2 when we didn't expect it to") + } + } + + set("", w1) + + { + prop := ".Name" + want := m.Name + if got := get(prop).String(); got != want { + t.Fatalf("wanted w1%v to be %v; got %v", prop, want, got) + } + newVal := "JS" + set(prop, newVal) + if got := m.Name; got != newVal { + t.Fatalf("wanted m%v to be %v; got %v", prop, newVal, got) + } + } + { + prop := ".Struct.Field" + want := m.Struct.Field + if got := get(prop).Int(); got != want { + t.Fatalf("wanted w1%v to be %v; got %v", prop, want, got) + } + newVal := 40 + set(prop, newVal) + if got := m.Struct.Field; got == newVal { + t.Fatalf("wanted m%v not to be %v; but was", prop, newVal) + } + } + { + prop := ".Pointer.Field" + want := m.Pointer.Field + if got := get(prop).Int(); got != want { + t.Fatalf("wanted w1%v to be %v; got %v", prop, want, got) + } + newVal := 40 + set(prop, newVal) + if got := m.Pointer.Field; got != newVal { + t.Fatalf("wanted m%v to be %v; got %v", prop, newVal, got) + } + } + { + prop := ".Array[0].Field" + want := m.Array[0].Field + if got := get(prop).Int(); got != want { + t.Fatalf("wanted w1%v to be %v; got %v", prop, want, got) + } + newVal := 40 + set(prop, newVal) + if got := m.Array[0].Field; got == newVal { + t.Fatalf("wanted m%v not to be %v; but was", prop, newVal) + } + } + { + prop := ".Slice[0].Field" + want := m.Slice[0].Field + if got := get(prop).Int(); got != want { + t.Fatalf("wanted w1%v to be %v; got %v", prop, want, got) + } + newVal := 40 + set(prop, newVal) + if got := m.Slice[0].Field; got != newVal { + t.Fatalf("wanted m%v to be %v; got %v", prop, newVal, got) + } + } + { + prop := ".GetF().Field" + want := m.Struct.Field + if got := get(prop).Int(); got != want { + t.Fatalf("wanted w1%v to be %v; got %v", prop, want, got) + } + newVal := 105 + set(prop, newVal) + if got := m.Struct.Field; got == newVal { + t.Fatalf("wanted m%v not to be %v; but was", prop, newVal) + } + } + { + method := ".ParamMethod" + want := method + m.Name = want + if got := call(method, get("")).String(); got != want { + t.Fatalf("wanted w1%v() to be %v; got %v", method, want, got) + } + } } func TestCallWithNull(t *testing.T) { @@ -513,6 +769,105 @@ func TestNewArrayBuffer(t *testing.T) { } } +func TestExternalize(t *testing.T) { + fn := js.Global.Call("eval", "(function(x) { return JSON.stringify(x); })") + + tests := []struct { + name string + input interface{} + want string + }{ + { + name: "bool", + input: true, + want: "true", + }, + { + name: "nil map", + input: func() map[string]string { return nil }(), + want: "null", + }, + { + name: "empty map", + input: map[string]string{}, + want: "{}", + }, + { + name: "nil slice", + input: func() []string { return nil }(), + want: "null", + }, + { + name: "empty slice", + input: []string{}, + want: "[]", + }, + { + name: "empty struct", + input: struct{}{}, + want: "{}", + }, + { + name: "nil pointer", + input: func() *int { return nil }(), + want: "null", + }, + { + name: "nil func", + input: func() func() { return nil }(), + want: "null", + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + result := fn.Invoke(tt.input).String() + if result != tt.want { + t.Errorf("Unexpected result %q != %q", result, tt.want) + } + }) + } +} + +func TestInternalizeSlice(t *testing.T) { + tests := []struct { + name string + init []int + want string + }{ + { + name: `nil slice`, + init: []int(nil), + want: `[]int(nil)`, + }, + { + name: `empty slice`, + init: []int{}, + want: `[]int{}`, + }, + { + name: `non-empty slice`, + init: []int{42, 53, 64}, + want: `[]int{42, 53, 64}`, + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + b := struct { + *js.Object + V []int `js:"V"` // V is externalized + }{Object: js.Global.Get("Object").New()} + b.V = tt.init + + result := fmt.Sprintf(`%#v`, b.V) // internalize b.V + if result != tt.want { + t.Errorf(`Unexpected result %q != %q`, result, tt.want) + } + }) + } +} + func TestInternalizeExternalizeNull(t *testing.T) { type S struct { *js.Object diff --git a/tests/linkname_test.go b/tests/linkname_test.go new file mode 100644 index 000000000..e6e9e90f9 --- /dev/null +++ b/tests/linkname_test.go @@ -0,0 +1,66 @@ +package tests + +import ( + "testing" + + _ "reflect" + _ "unsafe" + + "github.com/google/go-cmp/cmp" + "github.com/gopherjs/gopherjs/tests/testdata/linkname/method" + "github.com/gopherjs/gopherjs/tests/testdata/linkname/one" +) + +func TestLinknames(t *testing.T) { + defer func() { + if err := recover(); err != nil { + t.Fatalf("one.DoAll() paniced: %s", err) + } + }() + want := "doing one\n" + + "doing two\n" + + "doing imported one: doing internal one: one secret\n" + + "doing three\n" + + "doing imported three: doing internal three: three secret\n" + got := one.DoAll() + + if diff := cmp.Diff(want, got); diff != "" { + t.Fatalf("Callink linknamed functions returned a diff (-want,+got):\n%s", diff) + } +} + +func TestLinknameMethods(t *testing.T) { + defer func() { + if err := recover(); err != nil { + t.Fatalf("method.TestLinkname() paniced: %s", err) + } + }() + method.TestLinkname(t) +} + +type ( + name struct{ bytes *byte } + nameOff int32 + rtype struct{} +) + +//go:linkname rtype_nameOff reflect.(*rtype).nameOff +func rtype_nameOff(r *rtype, off nameOff) name + +//go:linkname newName reflect.newName +func newName(n, tag string, exported bool) name + +//go:linkname name_name reflect.name.name +func name_name(name) string + +//go:linkname resolveReflectName reflect.resolveReflectName +func resolveReflectName(n name) nameOff + +func TestLinknameReflectName(t *testing.T) { + info := "myinfo" + off := resolveReflectName(newName(info, "", false)) + n := rtype_nameOff(nil, off) + if s := name_name(n); s != info { + t.Fatalf("to reflect.name got %q: want %q", s, info) + } +} diff --git a/tests/lowlevel_test.go b/tests/lowlevel_test.go index 2d0e7fb9f..d25c63709 100644 --- a/tests/lowlevel_test.go +++ b/tests/lowlevel_test.go @@ -1,12 +1,14 @@ package tests_test import ( - "bytes" - "io/ioutil" + "os" "os/exec" "path/filepath" "runtime" + "strings" "testing" + + "github.com/google/go-cmp/cmp" ) // Test for internalization/externalization of time.Time/Date when time package is imported @@ -14,21 +16,36 @@ import ( // // See https://github.com/gopherjs/gopherjs/issues/279. func TestTimeInternalizationExternalization(t *testing.T) { - if runtime.GOARCH == "js" { + if runtime.GOOS == "js" { t.Skip("test meant to be run using normal Go compiler (needs os/exec)") } - got, err := exec.Command("gopherjs", "run", filepath.Join("testdata", "time_inexternalization.go")).Output() + gotb, err := exec.Command("gopherjs", "run", filepath.Join("testdata", "time_inexternalization.go")).Output() + got := string(gotb) if err != nil { t.Fatalf("%v:\n%s", err, got) } - want, err := ioutil.ReadFile(filepath.Join("testdata", "time_inexternalization.out")) + wantb, err := os.ReadFile(filepath.Join("testdata", "time_inexternalization.out")) + want := string(wantb) if err != nil { t.Fatalf("error reading .out file: %v", err) } + got = strings.ReplaceAll(got, "\r\n", "\n") + want = strings.ReplaceAll(want, "\r\n", "\n") - if !bytes.Equal(got, want) { - t.Fatalf("got != want:\ngot:\n%s\nwant:\n%s", got, want) + if diff := cmp.Diff(want, got); diff != "" { + t.Fatalf("Got diff (-want,+got):\n%s", diff) + } +} + +func TestDeferBuiltin(t *testing.T) { + if runtime.GOOS == "js" { + t.Skip("test meant to be run using normal Go compiler (needs os/exec)") + } + + got, err := exec.Command("gopherjs", "run", filepath.Join("testdata", "defer_builtin.go")).CombinedOutput() + if err != nil { + t.Fatalf("%v:\n%s", err, got) } } diff --git a/tests/map_js_test.go b/tests/map_js_test.go new file mode 100644 index 000000000..c815661ab --- /dev/null +++ b/tests/map_js_test.go @@ -0,0 +1,114 @@ +//go:build js && !wasm +// +build js,!wasm + +package tests + +import ( + "testing" + + "github.com/gopherjs/gopherjs/js" +) + +func Test_MapWrapper(t *testing.T) { + // This tests that various map types, and a map as a function argument and return, + // wrap and unwrap correctly. + type Dummy struct { + Msg string + } + + type StructWithMap struct { + StringMap map[string]string + IntMap map[int]int + DummyMap map[string]*Dummy + MapFunc func(map[string]string) map[string]string + } + + dummyMap := map[string]*Dummy{"key": {Msg: "value"}} + swm := &StructWithMap{ + StringMap: map[string]string{"key": "value"}, + IntMap: map[int]int{1: 2}, + DummyMap: dummyMap, + MapFunc: func(m map[string]string) map[string]string { + return m + }, + } + swmWrapper := js.MakeFullWrapper(swm) + swmUnwrapped := swmWrapper.Interface().(*StructWithMap) + mapFuncArg := map[string]string{"key2": "value2"} + + if got := swmWrapper.Get("StringMap").Get("key").String(); got != swm.StringMap["key"] { + t.Errorf("StringMap Got: %s, Want: %s", got, swm.StringMap["key"]) + } + if got := swmWrapper.Get("IntMap").Get("1").Int(); got != swm.IntMap[1] { + t.Errorf("IntMap Got: %d, Want: %d", got, swm.IntMap[1]) + } + if got := swmWrapper.Get("DummyMap").Get("key").Get("Msg").String(); got != swm.DummyMap["key"].Msg { + t.Errorf("DummyMap Got: %s, Want: %s", got, swm.DummyMap["key"].Msg) + } + if got := swmWrapper.Call("MapFunc", mapFuncArg).Get("key2").String(); got != mapFuncArg["key2"] { + t.Errorf("MapFunc Got: %s, Want: %s", got, mapFuncArg["key2"]) + } + + if got := swmUnwrapped.StringMap["key"]; got != swm.StringMap["key"] { + t.Errorf("Unwrapped StringMap Got: %s, Want: %s", got, swm.StringMap["key"]) + } + if got := swmUnwrapped.IntMap[1]; got != swm.IntMap[1] { + t.Errorf("Unwrapped IntMap Got: %d, Want: %d", got, swm.IntMap[1]) + } + if got := swmUnwrapped.DummyMap["key"].Msg; got != swm.DummyMap["key"].Msg { + t.Errorf("Unwrapped DummyMap Got: %s, Want: %s", got, swm.DummyMap["key"].Msg) + } + if got := swmUnwrapped.MapFunc(mapFuncArg)["key2"]; got != swm.MapFunc(mapFuncArg)["key2"] { + t.Errorf("Unwrapped MapFunc Got: %s, Want: %s", got, swm.MapFunc(mapFuncArg)["key2"]) + } +} + +func Test_MapStructObjectWrapper(t *testing.T) { + // This tests that maps work as expected when wrapping a Struct with js.Object field containing a map. + // js.Object fields' content should be passed to JS, so this is basically doubly-wrapping a map in two structs. + + stringMap := map[string]string{"key": "value"} + + // You cannot wrap a map directly, so put it in a struct. + type StructWithMap struct { + Map map[string]string + } + + swm := &StructWithMap{Map: stringMap} + swmWrapped := js.MakeFullWrapper(swm) + + // Now that map is wrapped in a struct, wrap the js.object in *another* struct. + type StructWithObject struct { + Wrappedswm *js.Object // This Object contains StructWithMap. + } + + swo := &StructWithObject{Wrappedswm: swmWrapped} + swoWrapper := js.MakeFullWrapper(swo) + swmUnwrapped := swoWrapper.Interface().(*StructWithObject) + + // Using "Get("Map")" shows that the first wrapping was unchanged. + if got := swoWrapper.Get("Wrappedswm").Get("Map").Get("key").String(); got != stringMap["key"] { + t.Errorf("Wrapped Wrappedswm value Got: %s, Want: %s", got, stringMap["key"]) + } + + if got := swmUnwrapped.Wrappedswm.Get("Map").Get("key").String(); got != stringMap["key"] { + t.Errorf("Unwrapped Wrappedswm value Got: %s, Want: %s", got, stringMap["key"]) + } +} + +func Test_MapEmbeddedObject(t *testing.T) { + o := js.Global.Get("JSON").Call("parse", `{"props": {"one": 1, "two": 2}}`) + + type data struct { + *js.Object + Props map[string]int `js:"props"` + } + + d := data{Object: o} + if d.Props["one"] != 1 { + t.Errorf("key 'one' value Got: %d, Want: %d", d.Props["one"], 1) + } + if d.Props["two"] != 2 { + t.Errorf("key 'two' value Got: %d, Want: %d", d.Props["two"], 2) + } +} diff --git a/tests/map_test.go b/tests/map_test.go new file mode 100644 index 000000000..56b9e6356 --- /dev/null +++ b/tests/map_test.go @@ -0,0 +1,299 @@ +package tests + +import ( + "strings" + "testing" +) + +// These tests exercise the api of maps and built-in functions that operate on maps +func Test_MapLiteral(t *testing.T) { + myMap := map[string]int{"test": 0, "key": 1, "charm": 2} + + assertMapApi(t, myMap) +} + +func Test_MapLiteralAssign(t *testing.T) { + myMap := map[string]int{} + myMap["test"] = 0 + myMap["key"] = 1 + myMap["charm"] = 2 + + assertMapApi(t, myMap) +} + +func Test_MapMake(t *testing.T) { + myMap := make(map[string]int) + myMap["test"] = 0 + myMap["key"] = 1 + myMap["charm"] = 2 + + assertMapApi(t, myMap) +} + +func Test_MapMakeSizeHint(t *testing.T) { + myMap := make(map[string]int, 3) + myMap["test"] = 0 + myMap["key"] = 1 + myMap["charm"] = 2 + + assertMapApi(t, myMap) +} + +func Test_MapNew(t *testing.T) { + myMap := new(map[string]int) + if *myMap != nil { + t.Errorf("Got: %v, Want: nil when made with new()", *myMap) + } +} + +func Test_MapType(t *testing.T) { + defer func() { + if err := recover(); err == nil { + t.Error("assignment on nil map should panic") + } else { + str := err.(error).Error() + if !strings.Contains(str, "assignment to entry in nil map") { + t.Errorf("nil map assignment Got: %s, Want: assigning to a nil map", str) + } + } + }() + + var myMap map[string]int + if myMap != nil { + t.Errorf("map declared with var, Got: %v, Want: nil", myMap) + } + + myMap["key"] = 666 +} + +func Test_MapLenPrecedence(t *testing.T) { + // This test verifies that the expression len(m) compiles to is evaluated + // correctly in the context of the enclosing expression. + m := make(map[string]string) + + if len(m) != 0 { + t.Errorf("inline len Got: %d, Want: 0", len(m)) + } + + i := len(m) + if i != 0 { + t.Errorf("assigned len Got: %d, Want: 0", i) + } +} + +func Test_MapRangeMutation(t *testing.T) { + // This test verifies that all of a map is iterated, even if the map is modified during iteration. + + myMap := map[string]int{"one": 1, "two": 2, "three": 3} + + var seenKeys []string + + for k := range myMap { + seenKeys = append(seenKeys, k) + if k == "two" { + delete(myMap, k) + } + } + + if len(seenKeys) != 3 { + t.Errorf("iteration seenKeys len Got: %d, Want: 3", len(seenKeys)) + } +} + +func Test_MapRangeNil(t *testing.T) { + // Tests that loops on nil maps do not error. + i := 0 + var m map[string]int + for k, v := range m { + _, _ = k, v + i++ + } + + if i > 0 { + t.Error("Got: Loops happened on a nil map, Want: no looping") + } +} + +func Test_MapDelete(t *testing.T) { + var nilMap map[string]string + m := map[string]string{"key": "value"} + + delete(nilMap, "key") // noop + delete(m, "key") + if m["key"] == "value" { + t.Error("Got: entry still set, Want: should have been deleted") + } + delete(m, "key") // noop +} + +func assertMapApi(t *testing.T, myMap map[string]int) { + if len(myMap) != 3 { + t.Errorf("initial len of map Got: %d, Want: 3", len(myMap)) + } + + var keys []string + var values []int + + for k, v := range myMap { + keys = append(keys, k) + values = append(values, v) + } + + if len(keys) != 3 || !containsString(keys, "test") || !containsString(keys, "key") || !containsString(keys, "charm") { + t.Error("range did not contain the correct keys") + } + + if len(values) != 3 || !containsInt(values, 0) || !containsInt(values, 1) || !containsInt(values, 2) { + t.Error("range did not contain the correct values") + } + + if myMap["test"] != 0 { + t.Errorf("test value Got: %d, Want: 0", myMap["test"]) + } + if myMap["key"] != 1 { + t.Errorf("key value Got: %d, Want: 1", myMap["key"]) + } + if myMap["missing"] != 0 { + t.Errorf("missing value Got: %d, Want: 0", myMap["missing"]) + } + + charm, found := myMap["charm"] + if charm != 2 { + t.Errorf("charm value Got: %d, Want: 2", charm) + } + if !found { + t.Error("charm should be found") + } + + missing2, found := myMap["missing"] + if missing2 != 0 { + t.Errorf("missing value Got: %d, Want: 0", missing2) + } + if found { + t.Error("absent key should not be found") + } + + delete(myMap, "missing") + if len(myMap) != 3 { + t.Errorf("len after noop delete Got: %d , Want: 3", len(myMap)) + } + + delete(myMap, "charm") + if len(myMap) != 2 { + t.Errorf("len after delete Got: %d, Want: 2", len(myMap)) + } + + myMap["add"] = 3 + if len(myMap) != 3 { + t.Errorf("len after assign by key Got: %d, Want: 3", len(myMap)) + } + if myMap["add"] != 3 { + t.Errorf("add value Got: %d, Want: 3", myMap["add"]) + } + + myMap["add"] = 10 + if len(myMap) != 3 { + t.Errorf("len after update by key Got: %d, Want: 3", len(myMap)) + } + if myMap["add"] != 10 { + t.Errorf("add value Got: %d, Want: 10", myMap["add"]) + } + + myMap2 := myMap + if len(myMap2) != len(myMap) { + t.Errorf("copy len Got: %d, Want: %d", len(myMap2), len(myMap)) + } +} + +func containsInt(s []int, e int) bool { + for _, a := range s { + if a == e { + return true + } + } + return false +} + +func containsString(s []string, e string) bool { + for _, a := range s { + if a == e { + return true + } + } + return false +} + +// These benchmarks test various Map operations, and include a slice benchmark for reference. +const size = 10000 + +func makeMap(size int) map[int]string { + myMap := make(map[int]string, size) + for i := 0; i < size; i++ { + myMap[i] = "data" + } + + return myMap +} + +func makeSlice(size int) []int { + slice := make([]int, size) + for i := 0; i < size; i++ { + slice[i] = i + } + + return slice +} + +func BenchmarkSliceLen(b *testing.B) { + slice := makeSlice(size) + + for i := 0; i < b.N; i++ { + if len(slice) > 0 { + } + } +} + +func BenchmarkMapLen(b *testing.B) { + myMap := makeMap(size) + + for i := 0; i < b.N; i++ { + if len(myMap) > 0 { + } + } +} + +func BenchmarkMapNilCheck(b *testing.B) { + myMap := makeMap(size) + + for i := 0; i < b.N; i++ { + if myMap != nil { + } + } +} + +func BenchmarkMapNilElementCheck(b *testing.B) { + myMap := makeMap(size) + + for i := 0; i < b.N; i++ { + if myMap[0] != "" { + } + } +} + +func BenchmarkSliceRange(b *testing.B) { + slice := makeSlice(size) + + for i := 0; i < b.N; i++ { + for range slice { + } + } +} + +func BenchmarkMapRange(b *testing.B) { + myMap := makeMap(size) + + for i := 0; i < b.N; i++ { + for range myMap { + } + } +} diff --git a/tests/misc_test.go b/tests/misc_test.go index c3d7835cd..8dc3be924 100644 --- a/tests/misc_test.go +++ b/tests/misc_test.go @@ -1,13 +1,15 @@ package tests import ( + "go/token" "math" "reflect" "runtime" "strings" + "sync" "testing" "time" - "vendored" + "unsafe" "github.com/gopherjs/gopherjs/tests/otherpkg" ) @@ -188,6 +190,8 @@ func TestPointerOfStructConversion(t *testing.T) { type B A + type AP *A + a1 := &A{Value: 1} b1 := (*B)(a1) b1.Value = 2 @@ -198,6 +202,10 @@ func TestPointerOfStructConversion(t *testing.T) { if a1 != a2 || b1 != b2 || a1.Value != 4 || a2.Value != 4 || b1.Value != 4 || b2.Value != 4 { t.Fail() } + + if got := reflect.TypeOf((AP)(&A{Value: 1})); got.String() != "tests.AP" { + t.Errorf("Got: reflect.TypeOf((AP)(&A{Value: 1})) = %v. Want: tests.AP.", got) + } } func TestCompareStruct(t *testing.T) { @@ -425,7 +433,7 @@ func TestEmptySelectCase(t *testing.T) { ch := make(chan int, 1) ch <- 42 - var v = 0 + v := 0 select { case v = <-ch: } @@ -434,17 +442,21 @@ func TestEmptySelectCase(t *testing.T) { } } -var a int -var b int -var C int -var D int +var ( + a int + b int + C int + D int +) -var a1 = &a -var a2 = &a -var b1 = &b -var C1 = &C -var C2 = &C -var D1 = &D +var ( + a1 = &a + a2 = &a + b1 = &b + C1 = &C + C2 = &C + D1 = &D +) func TestPkgVarPointers(t *testing.T) { if a1 != a2 || a1 == b1 || C1 != C2 || C1 == D1 { @@ -504,12 +516,6 @@ func TestGoexit(t *testing.T) { }() } -func TestVendoring(t *testing.T) { - if vendored.Answer != 42 { - t.Fail() - } -} - func TestShift(t *testing.T) { if x := uint(32); uint32(1)< 0 { + z += x << i + } + } + return z +} + +func TestMul64(t *testing.T) { + cfg := &quick.Config{ + MaxCountScale: 10000, + Rand: rand.New(rand.NewSource(0x5EED)), // Fixed seed for reproducibility. + } + if testing.Short() { + cfg.MaxCountScale = 1000 + } + + t.Run("unsigned", func(t *testing.T) { + err := quick.CheckEqual( + func(x, y uint64) uint64 { return x * y }, + naiveMul64, + cfg) + if err != nil { + t.Error(err) + } + }) + t.Run("signed", func(t *testing.T) { + // GopherJS represents 64-bit signed integers in a two-complement form, + // so bitwise multiplication looks identical for signed and unsigned integers + // and we can reuse naiveMul64() as a reference implementation for both with + // appropriate type conversions. + err := quick.CheckEqual( + func(x, y int64) int64 { return x * y }, + func(x, y int64) int64 { return int64(naiveMul64(uint64(x), uint64(y))) }, + cfg) + if err != nil { + t.Error(err) + } + }) +} + +func BenchmarkMul64(b *testing.B) { + // Prepare a randomized set of multipliers to make sure the benchmark doesn't + // get too specific for a single value. The trade-off is that the cost of + // loading from an array gets mixed into the result, but it is good enough for + // relative comparisons. + r := rand.New(rand.NewSource(0x5EED)) + const size = 1024 + xU := [size]uint64{} + yU := [size]uint64{} + xS := [size]int64{} + yS := [size]int64{} + for i := 0; i < size; i++ { + xU[i] = r.Uint64() + yU[i] = r.Uint64() + xS[i] = r.Int63() | (r.Int63n(2) << 63) + yS[i] = r.Int63() | (r.Int63n(2) << 63) + } + + b.Run("noop", func(b *testing.B) { + // This benchmark allows to gauge the cost of array load operations without + // the multiplications. + for i := 0; i < b.N; i++ { + runtime.KeepAlive(yU[i%size]) + runtime.KeepAlive(xU[i%size]) + } + }) + b.Run("unsigned", func(b *testing.B) { + for i := 0; i < b.N; i++ { + z := xU[i%size] * yU[i%size] + runtime.KeepAlive(z) + } + }) + b.Run("signed", func(b *testing.B) { + for i := 0; i < b.N; i++ { + z := xS[i%size] * yS[i%size] + runtime.KeepAlive(z) + } + }) +} + +func TestIssue733(t *testing.T) { + if runtime.GOOS != "js" { + t.Skip("test uses GopherJS-specific features") + } + + t.Run("sign", func(t *testing.T) { + f := float64(-1) + i := uint32(f) + underlying := js.InternalObject(i).Float() // Get the raw JS number behind i. + if want := float64(4294967295); underlying != want { + t.Errorf("Got: uint32(float64(%v)) = %v. Want: %v.", f, underlying, want) + } + }) + t.Run("truncation", func(t *testing.T) { + f := float64(300) + i := uint8(f) + underlying := js.InternalObject(i).Float() // Get the raw JS number behind i. + if want := float64(44); underlying != want { + t.Errorf("Got: uint32(float64(%v)) = %v. Want: %v.", f, underlying, want) + } + }) +} + +// Test_32BitEnvironment tests that GopherJS behaves correctly +// as a 32-bit environment for integers. To simulate a 32 bit environment +// we have to use `$imul` instead of `*` to get the correct result. +func Test_32BitEnvironment(t *testing.T) { + if bits.UintSize != 32 { + t.Skip(`test is only relevant for 32-bit environment`) + } + + tests := []struct { + x, y, exp uint64 + }{ + { + x: 65535, // x = 2^16 - 1 + y: 65535, // same as x + exp: 4294836225, // x² works since it doesn't overflow 32 bits. + }, + { + x: 134217729, // x = 2^27 + 1, x < 2^32 and x > sqrt(2^53), so x² overflows 53 bits. + y: 134217729, // same as x + exp: 268435457, // x² mod 2^32 = (2^27 + 1)² mod 2^32 = (2^54 + 2^28 + 1) mod 2^32 = 2^28 + 1 + // In pure JS, `x * x >>> 0`, would result in 268,435,456 because it lost the least significant bit + // prior to being truncated, where in a real 32 bit environment, it would be 268,435,457 since + // the rollover removed the most significant bit and doesn't affect the least significant bit. + }, + { + x: 4294967295, // x = 2^32 - 1 another case where x² overflows 53 bits causing a loss of precision. + y: 4294967295, // same as x + exp: 1, // x² mod 2^32 = (2^32 - 1)² mod 2^32 = (2^64 - 2^33 + 1) mod 2^32 = 1 + // In pure JS, `x * x >>> 0`, would result in 0 because it lost the least significant bits. + }, + { + x: 4294967295, // x = 2^32 - 1 + y: 3221225473, // y = 2^31 + 2^30 + 1 + exp: 1073741823, // 2^32 - 1. + // In pure JS, `x * y >>> 0`, would result in 1,073,741,824. + }, + { + x: 4294967295, // x = 2^32 - 1 + y: 134217729, // y = 2^27 + 1 + exp: 4160749567, // In pure JS, `x * y >>> 0`, would result in 4,160,749,568. + }, + } + + for i, test := range tests { + t.Run(fmt.Sprintf(`#%d/uint32`, i), func(t *testing.T) { + x, y, exp := uint32(test.x), uint32(test.y), uint32(test.exp) + if got := x * y; got != exp { + t.Errorf("got: %d\nwant: %d.", got, exp) + } + }) + + t.Run(fmt.Sprintf(`#%d/uintptr`, i), func(t *testing.T) { + x, y, exp := uintptr(test.x), uintptr(test.y), uintptr(test.exp) + if got := x * y; got != exp { + t.Errorf("got: %d\nwant: %d.", got, exp) + } + }) + + t.Run(fmt.Sprintf(`#%d/uint`, i), func(t *testing.T) { + x, y, exp := uint(test.x), uint(test.y), uint(test.exp) + if got := x * y; got != exp { + t.Errorf("got: %d\nwant: %d.", got, exp) + } + }) + + t.Run(fmt.Sprintf(`#%d/int32`, i), func(t *testing.T) { + x, y, exp := int32(test.x), int32(test.y), int32(test.exp) + if got := x * y; got != exp { + t.Errorf("got: %d\nwant: %d.", got, exp) + } + }) + + t.Run(fmt.Sprintf(`#%d/int`, i), func(t *testing.T) { + x, y, exp := int(test.x), int(test.y), int(test.exp) + if got := x * y; got != exp { + t.Errorf("got: %d\nwant: %d.", got, exp) + } + }) + } +} diff --git a/tests/runtime_test.go b/tests/runtime_test.go new file mode 100644 index 000000000..12f0b34c3 --- /dev/null +++ b/tests/runtime_test.go @@ -0,0 +1,162 @@ +//go:build js && gopherjs + +package tests + +import ( + "fmt" + "runtime" + "testing" + + "github.com/google/go-cmp/cmp" + "github.com/gopherjs/gopherjs/js" +) + +func Test_parseCallFrame(t *testing.T) { + tests := []struct { + name string + input string + want string + }{ + { + name: "Chrome 96.0.4664.110 on Linux #1", + input: "at foo (eval at $b (https://gopherjs.github.io/playground/playground.js:102:11836), :25887:60)", + want: "foo https://gopherjs.github.io/playground/playground.js 102 11836", + }, + { + name: "Chrome 96, anonymous eval", + input: " at eval ()", + want: "eval 0 0", + }, + { + name: "Chrome 96, anonymous Array.forEach", + input: " at Array.forEach ()", + want: "Array.forEach 0 0", + }, + { + name: "Chrome 96, file location only", + input: "at https://ajax.googleapis.com/ajax/libs/angularjs/1.2.18/angular.min.js:31:225", + want: " https://ajax.googleapis.com/ajax/libs/angularjs/1.2.18/angular.min.js 31 225", + }, + { + name: "Chrome 96, aliased function", + input: "at k.e.$externalizeWrapper.e.$externalizeWrapper [as run] (https://gopherjs.github.io/playground/playground.js:5:30547)", + want: "run https://gopherjs.github.io/playground/playground.js 5 30547", + }, + { + name: "Node.js v12.22.5", + input: " at Script.runInThisContext (vm.js:120:18)", + want: "Script.runInThisContext vm.js 120 18", + }, + { + name: "Node.js v12.22.5, aliased function", + input: "at REPLServer.runBound [as eval] (domain.js:440:12)", + want: "eval domain.js 440 12", + }, + { + name: "Firefox 78.15.0esr Linux", + input: "getEvalResult@resource://devtools/server/actors/webconsole/eval-with-debugger.js:231:24", + want: "getEvalResult resource://devtools/server/actors/webconsole/eval-with-debugger.js 231 24", + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + lines := js.Global.Get("String").New(tt.input) + frame := runtime.ParseCallFrame(lines) + got := fmt.Sprintf("%v %v %v %v", frame.FuncName, frame.File, frame.Line, frame.Col) + if tt.want != got { + t.Errorf("Unexpected result: %s", got) + } + }) + } +} + +func TestBuildPlatform(t *testing.T) { + if runtime.GOOS != "js" { + t.Errorf("Got runtime.GOOS=%q. Want: %q.", runtime.GOOS, "js") + } + if runtime.GOARCH != "ecmascript" { + t.Errorf("Got runtime.GOARCH=%q. Want: %q.", runtime.GOARCH, "ecmascript") + } +} + +type funcName string + +func masked(_ funcName) funcName { return "" } + +type callStack []funcName + +func (c *callStack) capture() { + *c = nil + pc := [100]uintptr{} + depth := runtime.Callers(0, pc[:]) + frames := runtime.CallersFrames(pc[:depth]) + for true { + frame, more := frames.Next() + *c = append(*c, funcName(frame.Function)) + if !more { + break + } + } +} + +func TestCallers(t *testing.T) { + got := callStack{} + + // Some of the GopherJS function names don't match upstream Go, or even the + // function names in the Go source when minified. + // Until https://github.com/gopherjs/gopherjs/issues/1085 is resolved, the + // mismatch is difficult to avoid, but we can at least use "masked" frames to + // make sure the number of frames matches expected. + want := callStack{ + masked("runtime.Callers"), + masked("github.com/gopherjs/gopherjs/tests.(*callerNames).capture"), + masked("github.com/gopherjs/gopherjs/tests.TestCallers.func{1,2}"), + masked("testing.tRunner"), + "runtime.goexit", + } + + opts := cmp.Comparer(func(a, b funcName) bool { + if a == masked("") || b == masked("") { + return true + } + return a == b + }) + + t.Run("Normal", func(t *testing.T) { + got.capture() + if diff := cmp.Diff(want, got, opts); diff != "" { + t.Errorf("runtime.Callers() returned a diff (-want,+got):\n%s", diff) + } + }) + + t.Run("Deferred", func(t *testing.T) { + defer func() { + if diff := cmp.Diff(want, got, opts); diff != "" { + t.Errorf("runtime.Callers() returned a diff (-want,+got):\n%s", diff) + } + }() + defer got.capture() + }) + + t.Run("Recover", func(t *testing.T) { + defer func() { + recover() + got.capture() + + want := callStack{ + masked("runtime.Callers"), + masked("github.com/gopherjs/gopherjs/tests.(*callerNames).capture"), + masked("github.com/gopherjs/gopherjs/tests.TestCallers.func3.1"), + "runtime.gopanic", + masked("github.com/gopherjs/gopherjs/tests.TestCallers.func{1,2}"), + masked("testing.tRunner"), + "runtime.goexit", + } + if diff := cmp.Diff(want, got, opts); diff != "" { + t.Errorf("runtime.Callers() returned a diff (-want,+got):\n%s", diff) + } + }() + panic("panic") + }) +} diff --git a/tests/slice_to_array_ptr_test.go b/tests/slice_to_array_ptr_test.go new file mode 100644 index 000000000..8392c839b --- /dev/null +++ b/tests/slice_to_array_ptr_test.go @@ -0,0 +1,167 @@ +package tests + +import ( + "runtime" + "testing" +) + +// https://tip.golang.org/ref/spec#Conversions_from_slice_to_array_pointer +func TestSliceToArrayPointerConversion(t *testing.T) { + // GopherJS uses TypedArray for numeric types and Array for everything else + // since those are substantially different types, the tests are repeated + // for both. + expectOutOfBoundsPanic := func(t *testing.T) { + t.Helper() + if recover() == nil { + t.Error("out-of-bounds conversion of s should panic") + } + } + + t.Run("Numeric", func(t *testing.T) { + s := make([]byte, 2, 4) + t.Run("NotNil", func(t *testing.T) { + s0 := (*[0]byte)(s) + if s0 == nil { + t.Error("s0 should not be nil") + } + }) + + t.Run("ElementPointerEquality", func(t *testing.T) { + s2 := (*[2]byte)(s) + if &s2[0] != &s[0] { + t.Error("&s2[0] should match &s[0]") + } + s3 := (*[1]byte)(s[1:]) + if &s3[0] != &s[1] { + t.Error("&s3[0] should match &s[1]") + } + }) + + t.Run("SliceToLargerArray", func(t *testing.T) { + defer expectOutOfBoundsPanic(t) + s4 := (*[4]byte)(s) + _ = s4 + }) + + t.Run("SharedMemory", func(t *testing.T) { + s2 := (*[2]byte)(s) + (*s2)[0] = 'x' + if s[0] != 'x' { + t.Errorf("s[0] should be changed") + } + + s3 := (*[1]byte)(s[1:]) + (*s3)[0] = 'y' + if s[1] != 'y' { + t.Errorf("s[1] should be changed") + } + }) + + var q []byte + t.Run("NilSlice", func(t *testing.T) { + q0 := (*[0]byte)(q) + if q0 != nil { + t.Error("q0 should be nil") + } + }) + + t.Run("NilSliceToLargerArray", func(t *testing.T) { + defer expectOutOfBoundsPanic(t) + q1 := (*[1]byte)(q) + _ = q1 + }) + + t.Run("ZeroLenSlice", func(t *testing.T) { + u := make([]byte, 0) + u0 := (*[0]byte)(u) + if u0 == nil { + t.Error("u0 should not be nil") + } + }) + + t.Run("SliceToShorterArray", func(t *testing.T) { + s[0] = 'x' + s[1] = 'y' + s4 := (*[1]byte)(s[:]) + if got := s4[0]; got != 'x' { + t.Errorf("Got s0[0] = %q, want 'x'", got) + } + if got := len(s4); got != 1 { + t.Errorf("Got len(s0) = %d, want 1.", got) + } + + // Verify that the backing array size has been reduced to match the Go + // type. If not, a "source too large" runtime exception will be thrown + // upon the copy attempt. + s5 := [1]byte{} + s5 = *s4 + runtime.KeepAlive(s5) + }) + }) + + t.Run("String", func(t *testing.T) { + s := make([]string, 2, 2) + t.Run("NotNil", func(t *testing.T) { + s0 := (*[0]string)(s) + if s0 == nil { + t.Error("s0 should not be nil") + } + }) + + t.Run("ElementPointerEquality", func(t *testing.T) { + s2 := (*[2]string)(s) + if &s2[0] != &s[0] { + t.Error("&s2[0] should match &s[0]") + } + + t.Skip("non-numeric slice to underlying array conversion is not supported for subslices") + s3 := (*[1]string)(s[1:]) + if &s3[0] != &s[1] { + t.Error("&s3[0] should match &s[1]") + } + }) + + t.Run("SliceToLargerArray", func(t *testing.T) { + defer expectOutOfBoundsPanic(t) + s4 := (*[4]string)(s) + _ = s4 + }) + + t.Run("SharedMemory", func(t *testing.T) { + s2 := (*[2]string)(s) + (*s2)[0] = "x" + if s[0] != "x" { + t.Errorf("s[0] should be changed") + } + + t.Skip("non-numeric slice to underlying array conversion is not supported for subslices") + s3 := (*[1]string)(s[1:]) + (*s3)[0] = "y" + if s[1] != "y" { + t.Errorf("s[1] should be changed") + } + }) + + var q []string + t.Run("NilSlice", func(t *testing.T) { + q0 := (*[0]string)(q) + if q0 != nil { + t.Error("q0 should be nil") + } + }) + + t.Run("NilSliceToLargerArray", func(t *testing.T) { + defer expectOutOfBoundsPanic(t) + q1 := (*[1]string)(q) + _ = q1 + }) + + t.Run("ZeroLenSlice", func(t *testing.T) { + u := make([]string, 0) + u0 := (*[0]string)(u) + if u0 == nil { + t.Error("u0 should not be nil") + } + }) + }) +} diff --git a/tests/syscall_legacy_test.go b/tests/syscall_legacy_test.go new file mode 100644 index 000000000..bdfc08848 --- /dev/null +++ b/tests/syscall_legacy_test.go @@ -0,0 +1,28 @@ +package tests + +import ( + "os/exec" + "runtime" + "testing" +) + +// TestLegacySyscall tests raw syscall invocation using node_syscall extension. +// +// This mode is largely deprecated (e.g. we build standard library with GOOS=js), +// but we support using the extension when "legacy_syscall" build tag is set. +// This test can be removed after we stop supporting node_syscall extension. +func TestLegacySyscall(t *testing.T) { + if runtime.GOOS != "linux" { + t.Skip("This test is supported only under Linux") + } + cmd := exec.Command("gopherjs", "run", "--tags=legacy_syscall", "./testdata/legacy_syscall/main.go") + out, err := cmd.CombinedOutput() + got := string(out) + if err != nil { + t.Log(got) + t.Fatalf("Failed to run test code under gopherjs: %s", err) + } + if want := "Hello, world!\n"; got != want { + t.Errorf("Got wrong output: %q. Want: %q.", got, want) + } +} diff --git a/tests/syscall_test.go b/tests/syscall_test.go index bf0319a15..104800df7 100644 --- a/tests/syscall_test.go +++ b/tests/syscall_test.go @@ -1,9 +1,9 @@ +//go:build js // +build js package tests import ( - "io/ioutil" "os" "syscall" "testing" @@ -19,13 +19,13 @@ func TestGetpid(t *testing.T) { } func TestOpen(t *testing.T) { - f, err := ioutil.TempFile("", "") + f, err := os.CreateTemp("", "") if err != nil { t.Fatalf("Failed to create a temp file: %s", err) } f.Close() defer os.Remove(f.Name()) - fd, err := syscall.Open(f.Name(), syscall.O_RDONLY, 0600) + fd, err := syscall.Open(f.Name(), syscall.O_RDONLY, 0o600) if err != nil { t.Fatalf("syscall.Open() returned error: %s", err) } diff --git a/tests/syscalljs/js_test.go b/tests/syscalljs/js_test.go deleted file mode 100644 index 5a59d9346..000000000 --- a/tests/syscalljs/js_test.go +++ /dev/null @@ -1,395 +0,0 @@ -// This file is basically copied from $GOROOT/src/syscall/js/js_test.go - -// Copyright 2018 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// +build js - -// To run these tests: -// -// - Install Node -// - Add /path/to/go/misc/wasm to your $PATH (so that "go test" can find -// "go_js_wasm_exec"). -// - GOOS=js GOARCH=wasm go test -// -// See -exec in "go help test", and "go help run" for details. - -package js_test - -import ( - "fmt" - "math" - "syscall/js" - "testing" -) - -func TestMain(m *testing.M) { - // Suppress the 'deadlock' error on GopherJS by goroutine - // (https://github.com/gopherjs/gopherjs/issues/826). - go func() { - m.Run() - }() -} - -var dummys = js.Global().Call("eval", `({ - someBool: true, - someString: "abc\u1234", - someInt: 42, - someFloat: 42.123, - someArray: [41, 42, 43], - someDate: new Date(), - add: function(a, b) { - return a + b; - }, - zero: 0, - stringZero: "0", - NaN: NaN, - emptyObj: {}, - emptyArray: [], - Infinity: Infinity, - NegInfinity: -Infinity, - objNumber0: new Number(0), - objBooleanFalse: new Boolean(false), -})`) - -func TestBool(t *testing.T) { - want := true - o := dummys.Get("someBool") - if got := o.Bool(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - dummys.Set("otherBool", want) - if got := dummys.Get("otherBool").Bool(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - if dummys.Get("someBool") != dummys.Get("someBool") { - t.Errorf("same value not equal") - } -} - -func TestString(t *testing.T) { - want := "abc\u1234" - o := dummys.Get("someString") - if got := o.String(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - dummys.Set("otherString", want) - if got := dummys.Get("otherString").String(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - if dummys.Get("someString") != dummys.Get("someString") { - t.Errorf("same value not equal") - } - - wantInt := "42" - o = dummys.Get("someInt") - if got := o.String(); got != wantInt { - t.Errorf("got %#v, want %#v", got, wantInt) - } -} - -func TestInt(t *testing.T) { - want := 42 - o := dummys.Get("someInt") - if got := o.Int(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - dummys.Set("otherInt", want) - if got := dummys.Get("otherInt").Int(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - if dummys.Get("someInt") != dummys.Get("someInt") { - t.Errorf("same value not equal") - } - if got := dummys.Get("zero").Int(); got != 0 { - t.Errorf("got %#v, want %#v", got, 0) - } -} - -func TestIntConversion(t *testing.T) { - testIntConversion(t, 0) - testIntConversion(t, 1) - testIntConversion(t, -1) - testIntConversion(t, 1<<20) - testIntConversion(t, -1<<20) - - // Skip too big integers. They cannot be compiled with 32bit environment, and GopherJS is one of them. - // testIntConversion(t, 1<<40) - // testIntConversion(t, -1<<40) - // testIntConversion(t, 1<<60) - // testIntConversion(t, -1<<60) -} - -func testIntConversion(t *testing.T, want int) { - if got := js.ValueOf(want).Int(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } -} - -func TestFloat(t *testing.T) { - want := 42.123 - o := dummys.Get("someFloat") - if got := o.Float(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - dummys.Set("otherFloat", want) - if got := dummys.Get("otherFloat").Float(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - if dummys.Get("someFloat") != dummys.Get("someFloat") { - t.Errorf("same value not equal") - } -} - -func TestObject(t *testing.T) { - if dummys.Get("someArray") != dummys.Get("someArray") { - t.Errorf("same value not equal") - } - - // An object and its prototype should not be equal. - proto := js.Global().Get("Object").Get("prototype") - o := js.Global().Call("eval", "new Object()") - if proto == o { - t.Errorf("object equals to its prototype") - } -} - -func TestFrozenObject(t *testing.T) { - o := js.Global().Call("eval", "(function () { let o = new Object(); o.field = 5; Object.freeze(o); return o; })()") - want := 5 - if got := o.Get("field").Int(); want != got { - t.Errorf("got %#v, want %#v", got, want) - } -} - -func TestTypedArrayOf(t *testing.T) { - testTypedArrayOf(t, "[]int8", []int8{0, -42, 0}, -42) - testTypedArrayOf(t, "[]int16", []int16{0, -42, 0}, -42) - testTypedArrayOf(t, "[]int32", []int32{0, -42, 0}, -42) - testTypedArrayOf(t, "[]uint8", []uint8{0, 42, 0}, 42) - testTypedArrayOf(t, "[]uint16", []uint16{0, 42, 0}, 42) - testTypedArrayOf(t, "[]uint32", []uint32{0, 42, 0}, 42) - testTypedArrayOf(t, "[]float32", []float32{0, -42.5, 0}, -42.5) - testTypedArrayOf(t, "[]float64", []float64{0, -42.5, 0}, -42.5) -} - -func testTypedArrayOf(t *testing.T, name string, slice interface{}, want float64) { - t.Run(name, func(t *testing.T) { - a := js.TypedArrayOf(slice) - got := a.Index(1).Float() - a.Release() - if got != want { - t.Errorf("got %#v, want %#v", got, want) - } - }) -} - -func TestNaN(t *testing.T) { - t.Skip("NaN cannot be compared") - - want := js.ValueOf(math.NaN()) - got := dummys.Get("NaN") - if got != want { - t.Errorf("got %#v, want %#v", got, want) - } -} - -func TestUndefined(t *testing.T) { - dummys.Set("test", js.Undefined()) - if dummys == js.Undefined() || dummys.Get("test") != js.Undefined() || dummys.Get("xyz") != js.Undefined() { - t.Errorf("js.Undefined expected") - } -} - -func TestNull(t *testing.T) { - dummys.Set("test1", nil) - dummys.Set("test2", js.Null()) - if dummys == js.Null() || dummys.Get("test1") != js.Null() || dummys.Get("test2") != js.Null() { - t.Errorf("js.Null expected") - } -} - -func TestLength(t *testing.T) { - if got := dummys.Get("someArray").Length(); got != 3 { - t.Errorf("got %#v, want %#v", got, 3) - } -} - -func TestIndex(t *testing.T) { - if got := dummys.Get("someArray").Index(1).Int(); got != 42 { - t.Errorf("got %#v, want %#v", got, 42) - } -} - -func TestSetIndex(t *testing.T) { - dummys.Get("someArray").SetIndex(2, 99) - if got := dummys.Get("someArray").Index(2).Int(); got != 99 { - t.Errorf("got %#v, want %#v", got, 99) - } -} - -func TestCall(t *testing.T) { - var i int64 = 40 - if got := dummys.Call("add", i, 2).Int(); got != 42 { - t.Errorf("got %#v, want %#v", got, 42) - } - if got := dummys.Call("add", js.Global().Call("eval", "40"), 2).Int(); got != 42 { - t.Errorf("got %#v, want %#v", got, 42) - } -} - -func TestInvoke(t *testing.T) { - var i int64 = 40 - if got := dummys.Get("add").Invoke(i, 2).Int(); got != 42 { - t.Errorf("got %#v, want %#v", got, 42) - } -} - -func TestNew(t *testing.T) { - if got := js.Global().Get("Array").New(42).Length(); got != 42 { - t.Errorf("got %#v, want %#v", got, 42) - } -} - -func TestInstanceOf(t *testing.T) { - someArray := js.Global().Get("Array").New() - if got, want := someArray.InstanceOf(js.Global().Get("Array")), true; got != want { - t.Errorf("got %#v, want %#v", got, want) - } - if got, want := someArray.InstanceOf(js.Global().Get("Function")), false; got != want { - t.Errorf("got %#v, want %#v", got, want) - } -} - -func TestType(t *testing.T) { - if got, want := js.Undefined().Type(), js.TypeUndefined; got != want { - t.Errorf("got %s, want %s", got, want) - } - if got, want := js.Null().Type(), js.TypeNull; got != want { - t.Errorf("got %s, want %s", got, want) - } - if got, want := js.ValueOf(true).Type(), js.TypeBoolean; got != want { - t.Errorf("got %s, want %s", got, want) - } - if got, want := js.ValueOf(0).Type(), js.TypeNumber; got != want { - t.Errorf("got %s, want %s", got, want) - } - if got, want := js.ValueOf(42).Type(), js.TypeNumber; got != want { - t.Errorf("got %s, want %s", got, want) - } - if got, want := js.ValueOf("test").Type(), js.TypeString; got != want { - t.Errorf("got %s, want %s", got, want) - } - if got, want := js.Global().Get("Symbol").Invoke("test").Type(), js.TypeSymbol; got != want { - t.Errorf("got %s, want %s", got, want) - } - if got, want := js.Global().Get("Array").New().Type(), js.TypeObject; got != want { - t.Errorf("got %s, want %s", got, want) - } - if got, want := js.Global().Get("Array").Type(), js.TypeFunction; got != want { - t.Errorf("got %s, want %s", got, want) - } -} - -type object = map[string]interface{} -type array = []interface{} - -func TestValueOf(t *testing.T) { - a := js.ValueOf(array{0, array{0, 42, 0}, 0}) - if got := a.Index(1).Index(1).Int(); got != 42 { - t.Errorf("got %v, want %v", got, 42) - } - - o := js.ValueOf(object{"x": object{"y": 42}}) - if got := o.Get("x").Get("y").Int(); got != 42 { - t.Errorf("got %v, want %v", got, 42) - } -} - -func TestZeroValue(t *testing.T) { - var v js.Value - if v != js.Undefined() { - t.Error("zero js.Value is not js.Undefined()") - } -} - -func TestFuncOf(t *testing.T) { - c := make(chan struct{}) - cb := js.FuncOf(func(this js.Value, args []js.Value) interface{} { - if got := args[0].Int(); got != 42 { - t.Errorf("got %#v, want %#v", got, 42) - } - c <- struct{}{} - return nil - }) - defer cb.Release() - js.Global().Call("setTimeout", cb, 0, 42) - <-c -} - -func TestInvokeFunction(t *testing.T) { - called := false - cb := js.FuncOf(func(this js.Value, args []js.Value) interface{} { - cb2 := js.FuncOf(func(this js.Value, args []js.Value) interface{} { - called = true - return 42 - }) - defer cb2.Release() - return cb2.Invoke() - }) - defer cb.Release() - if got := cb.Invoke().Int(); got != 42 { - t.Errorf("got %#v, want %#v", got, 42) - } - if !called { - t.Error("function not called") - } -} - -func ExampleFuncOf() { - var cb js.Func - cb = js.FuncOf(func(this js.Value, args []js.Value) interface{} { - fmt.Println("button clicked") - cb.Release() // release the function if the button will not be clicked again - return nil - }) - js.Global().Get("document").Call("getElementById", "myButton").Call("addEventListener", "click", cb) -} - -// See -// - https://developer.mozilla.org/en-US/docs/Glossary/Truthy -// - https://stackoverflow.com/questions/19839952/all-falsey-values-in-javascript/19839953#19839953 -// - http://www.ecma-international.org/ecma-262/5.1/#sec-9.2 -func TestTruthy(t *testing.T) { - want := true - for _, key := range []string{ - "someBool", "someString", "someInt", "someFloat", "someArray", "someDate", - "stringZero", // "0" is truthy - "add", // functions are truthy - "emptyObj", "emptyArray", "Infinity", "NegInfinity", - // All objects are truthy, even if they're Number(0) or Boolean(false). - "objNumber0", "objBooleanFalse", - } { - if got := dummys.Get(key).Truthy(); got != want { - t.Errorf("%s: got %#v, want %#v", key, got, want) - } - } - - want = false - if got := dummys.Get("zero").Truthy(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - if got := dummys.Get("NaN").Truthy(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - if got := js.ValueOf("").Truthy(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - if got := js.Null().Truthy(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } - if got := js.Undefined().Truthy(); got != want { - t.Errorf("got %#v, want %#v", got, want) - } -} diff --git a/tests/testdata/defer_builtin.go b/tests/testdata/defer_builtin.go new file mode 100644 index 000000000..264b78b61 --- /dev/null +++ b/tests/testdata/defer_builtin.go @@ -0,0 +1,24 @@ +package main + +type ( + set map[interface{}]struct{} + key struct{ a int } +) + +var m = set{} + +func deferredDelete(k key) { + // This built-in deferral will transpile into a "delete" statement wrapped + // into a proxy lambda. This test ensures we correctly assign proxy lambda + // argument types. + defer delete(m, k) +} + +func main() { + k := key{a: 42} + m[k] = struct{}{} + deferredDelete(k) + if _, found := m[k]; found { + panic("deferred delete didn't work!") + } +} diff --git a/tests/testdata/legacy_syscall/main.go b/tests/testdata/legacy_syscall/main.go new file mode 100644 index 000000000..75ba22f6b --- /dev/null +++ b/tests/testdata/legacy_syscall/main.go @@ -0,0 +1,19 @@ +//go:build legacy_syscall && gopherjs +// +build legacy_syscall,gopherjs + +// This program tests GopherJS's ability to perform raw syscalls using the +// deprecated node_syscall extension. See TestLegacySyscall. +package main + +import ( + "syscall" + "unsafe" +) + +func main() { + msg := []byte("Hello, world!\n") + _, _, errno := syscall.Syscall(1 /* SYS_WRITE on Linux */, 1 /* stdout */, uintptr(unsafe.Pointer(&msg[0])), uintptr(len(msg))) + if errno != 0 { + println(errno.Error()) + } +} diff --git a/tests/testdata/linkname/main.go b/tests/testdata/linkname/main.go new file mode 100644 index 000000000..203f04d2d --- /dev/null +++ b/tests/testdata/linkname/main.go @@ -0,0 +1,8 @@ +// A test program to demonstrate go:linkname directive support. +package main + +import "github.com/gopherjs/gopherjs/tests/testdata/linkname/one" + +func main() { + print(one.DoAll()) +} diff --git a/tests/testdata/linkname/method/method.go b/tests/testdata/linkname/method/method.go new file mode 100644 index 000000000..958e9a103 --- /dev/null +++ b/tests/testdata/linkname/method/method.go @@ -0,0 +1,450 @@ +package method + +import ( + "sort" + "strings" + "testing" + _ "unsafe" +) + +type Point struct { + X int + Y int +} + +func (pt *Point) Set(x, y int) { + pt.X, pt.Y = x, y +} + +func (pt Point) Get() (int, int) { + return pt.X, pt.Y +} + +//go:linkname struct_Set github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Point).Set +func struct_Set(pt *point, x int, y int) + +//go:linkname struct_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Point.Get +func struct_Get(pt point) (int, int) + +type point struct { + X int + Y int +} + +func testStruct(t *testing.T) { + var pt point + struct_Set(&pt, 1, 2) + x, y := struct_Get(pt) + if x != 1 || y != 2 { + t.Fatalf("Got: struct_Get(pt) = (%v,%v). Want: (1,2).", x, y) + } +} + +type List []string + +func (t *List) Append(s ...string) { + *t = append(*t, s...) +} + +func (t List) Get() string { + return strings.Join(t, ",") +} + +type list []string + +//go:linkname slice_Append github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*List).Append +func slice_Append(*list, ...string) + +//go:linkname slice_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.List.Get +func slice_Get(list) string + +func testSlice(t *testing.T) { + var v list + v = append(v, "one") + slice_Append(&v, "two", "three") + got := slice_Get(v) + want := "one,two,three" + if got != want { + t.Fatalf("Got: slice_Get(v) = %q. Want: %q.", got, want) + } +} + +type Array [5]string + +func (t *Array) Set(i int, s string) { + (*t)[i] = s +} + +func (t Array) Get() string { + return strings.Join(t[:], ",") +} + +type array [5]string + +//go:linkname array_Set github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Array).Set +func array_Set(*array, int, string) + +//go:linkname array_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Array.Get +func array_Get(array) string + +func testArray(t *testing.T) { + var a array + a[0] = "one" + array_Set(&a, 1, "two") + array_Set(&a, 4, "five") + got := array_Get(a) + want := "one,two,,,five" + if got != want { + t.Fatalf("Got: array_Get(a) = %q. Want: %q.", got, want) + } +} + +type Map map[int]string + +func (m Map) Set(key int, value string) { + m[key] = value +} + +func (m *Map) SetPtr(key int, value string) { + (*m)[key] = value +} + +func (m Map) Get() string { + var list []string + for _, v := range m { + list = append(list, v) + } + sort.Strings(list) + return strings.Join(list, ",") +} + +type _map map[int]string + +//go:linkname map_Set github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Map.Set +func map_Set(_map, int, string) + +//go:linkname map_SetPtr github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Map).SetPtr +func map_SetPtr(*_map, int, string) + +//go:linkname map_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Map.Get +func map_Get(_map) string + +func testMap(t *testing.T) { + m := make(_map) + map_Set(m, 1, "one") + map_SetPtr(&m, 2, "two") + got := map_Get(m) + want := "one,two" + if got != want { + t.Fatalf("Got: map_Get(m) = %q. Want: %q.", got, want) + } +} + +type Func func(int, int) int + +func (f Func) Call(a, b int) int { + return f(a, b) +} + +func (f *Func) CallPtr(a, b int) int { + return (*f)(a, b) +} + +type _func func(int, int) int + +//go:linkname func_Call github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Func.Call +func func_Call(_func, int, int) int + +//go:linkname func_CallPtr github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Func).CallPtr +func func_CallPtr(*_func, int, int) int + +func testFunc(t *testing.T) { + var fn _func = func(a, b int) int { + return a + b + } + r := func_Call(fn, 100, 200) + if r != 300 { + t.Fatalf("Got: func_Call(fn,100,200) = %v. Want: 300.", r) + } + r2 := func_CallPtr(&fn, 100, 200) + if r2 != 300 { + t.Fatalf("Got: func_CallPtr(fn,100,200) = %v. Want: 300.", r2) + } +} + +type Chan chan int + +func (c Chan) Send(n int) { + c <- n +} + +func (c *Chan) SendPtr(n int) { + *c <- n +} + +func (c Chan) Recv() int { + return <-c +} + +type _chan chan int + +//go:linkname chan_Send github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Chan.Send +func chan_Send(_chan, int) + +//go:linkname chan_SendPtr github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Chan).SendPtr +func chan_SendPtr(*_chan, int) + +//go:linkname chan_Recv github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Chan.Recv +func chan_Recv(_chan) int + +func testChan(t *testing.T) { + c := make(_chan) + go func() { + chan_Send(c, 100) + }() + r := chan_Recv(c) + if r != 100 { + t.Fatalf("Got: chan_Recv(c) = %v. Want: 100.", r) + } + go func() { + chan_SendPtr(&c, 200) + }() + r = chan_Recv(c) + if r != 200 { + t.Fatalf("Got: chan_Recv(c) = %v. Want: 200.", r) + } +} + +type Int int + +func (m *Int) Set(v int) { + *m = Int(v) +} + +func (m Int) Get() int { + return int(m) +} + +type _int int + +//go:linkname int_Set github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Int).Set +func int_Set(*_int, int) int + +//go:linkname int_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Int.Get +func int_Get(_int) int + +func testInt(t *testing.T) { + var i _int + int_Set(&i, 100) + r := int_Get(i) + if r != 100 { + t.Fatalf("Got: int_Get(i) = %v. Want: 100.", r) + } +} + +type Uint uint + +func (m *Uint) Set(v uint) { + *m = Uint(v) +} + +func (m Uint) Get() uint { + return uint(m) +} + +type _uint uint + +//go:linkname uint_Set github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Uint).Set +func uint_Set(*_uint, uint) uint + +//go:linkname uint_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Uint.Get +func uint_Get(_uint) uint + +func testUint(t *testing.T) { + var i _uint + uint_Set(&i, 100) + r := uint_Get(i) + if r != 100 { + t.Fatalf("Got: uint_Get(i) = %v. Want: 100.", r) + } +} + +type Float64 float64 + +func (m *Float64) Set(v float64) { + *m = Float64(v) +} + +func (m Float64) Get() float64 { + return float64(m) +} + +type _float64 float64 + +//go:linkname float64_Set github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Float64).Set +func float64_Set(*_float64, float64) float64 + +//go:linkname float64_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Float64.Get +func float64_Get(_float64) float64 + +func testFloat64(t *testing.T) { + var i _float64 + float64_Set(&i, 3.14) + r := float64_Get(i) + if r != 3.14 { + t.Fatalf("Got: float64_Get(i) = %v. Want: 3.14.", r) + } +} + +type Complex128 complex128 + +func (m *Complex128) Set(v complex128) { + *m = Complex128(v) +} + +func (m Complex128) Get() complex128 { + return complex128(m) +} + +type _complex128 complex128 + +//go:linkname complex128_Set github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Complex128).Set +func complex128_Set(*_complex128, complex128) complex128 + +//go:linkname complex128_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Complex128.Get +func complex128_Get(_complex128) complex128 + +func testComplex128(t *testing.T) { + var i _complex128 + want := 1 + 2i + complex128_Set(&i, want) + got := complex128_Get(i) + if got != want { + t.Fatalf("Got: complex128_Get(i) = %v. Want: %v.", got, want) + } +} + +type Uintptr uintptr + +func (m *Uintptr) Set(v uintptr) { + *m = Uintptr(v) +} + +func (m Uintptr) Get() uintptr { + return uintptr(m) +} + +type _uintptr uintptr + +//go:linkname uintptr_Set github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Uintptr).Set +func uintptr_Set(*_uintptr, uintptr) uintptr + +//go:linkname uintptr_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Uintptr.Get +func uintptr_Get(_uintptr) uintptr + +func testUintptr(t *testing.T) { + var i _uintptr + uintptr_Set(&i, 0x1234) + r := uintptr_Get(i) + if r != 0x1234 { + t.Fatalf("Got: uintptr_Get(i) = %v. Want: 0x1234.", r) + } +} + +type Bool bool + +func (m *Bool) Set(v bool) { + *m = Bool(v) +} + +func (m Bool) Get() bool { + return bool(m) +} + +type _bool bool + +//go:linkname bool_Set github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Bool).Set +func bool_Set(*_bool, bool) bool + +//go:linkname bool_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Bool.Get +func bool_Get(_bool) bool + +func testBool(t *testing.T) { + var i _bool + bool_Set(&i, true) + r := bool_Get(i) + if r != true { + t.Fatalf("Got: bool_Get(i) = %v. Want: true.", r) + } +} + +type Byte byte + +func (m *Byte) Set(v byte) { + *m = Byte(v) +} + +func (m Byte) Get() byte { + return byte(m) +} + +type _byte byte + +//go:linkname byte_Set github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*Byte).Set +func byte_Set(*_byte, byte) byte + +//go:linkname byte_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.Byte.Get +func byte_Get(_byte) byte + +func testByte(t *testing.T) { + var i _byte + byte_Set(&i, 0x7f) + r := byte_Get(i) + if r != 0x7f { + t.Fatalf("Got: byte_Get(i) = %v. Want: 0x7f.", r) + } +} + +type String string + +func (m *String) Set(v string) { + *m = String(v) +} + +func (m String) Get() string { + return string(m) +} + +type _string string + +//go:linkname string_Set github.com/gopherjs/gopherjs/tests/testdata/linkname/method.(*String).Set +func string_Set(*_string, string) string + +//go:linkname string_Get github.com/gopherjs/gopherjs/tests/testdata/linkname/method.String.Get +func string_Get(_string) string + +func testString(t *testing.T) { + var i _string + want := "hello world" + string_Set(&i, want) + got := string_Get(i) + if got != want { + t.Fatalf("Got: string_Get(i) = %q. Want: %q.", got, want) + } +} + +func TestLinkname(t *testing.T) { + testStruct(t) + testSlice(t) + testArray(t) + testMap(t) + testFunc(t) + testChan(t) + testBool(t) + testByte(t) + testInt(t) + testUint(t) + testFloat64(t) + testComplex128(t) + testString(t) +} diff --git a/tests/testdata/linkname/one/one.go b/tests/testdata/linkname/one/one.go new file mode 100644 index 000000000..0ec753525 --- /dev/null +++ b/tests/testdata/linkname/one/one.go @@ -0,0 +1,52 @@ +// Package one is a root of test dependency tree, importing packages two and +// three. It ensures a deterministic import and initialization order of the +// test packages. +package one + +import ( + _ "unsafe" // for go:linkname + + "github.com/gopherjs/gopherjs/tests/testdata/linkname/three" + "github.com/gopherjs/gopherjs/tests/testdata/linkname/two" +) + +// DoOne is a regular function from the package one to demonstrate a call +// without any special linking trickery. +func DoOne() string { + return "doing one" +} + +// doInternalOne is a function implemented in package one, but actually called +// by package two using a go:linkname directive to gain access to it. Note: +// dead-code elimination must be able to preserve this function. +// +// This is a demonstration that an imported package can linkname a function +// from an importer package. +func doInternalOne() string { + return "doing internal one: " + oneSecret +} + +// oneSecret is an unexported variable in the package one, which doInternalOne() +// must be able to access even when called from another package using a linkname +// mechanism. +var oneSecret = "one secret" + +// doInternalThree is implemented in the package three, but not exported (for +// example, to not make it a public API), which package one gains access to +// via a go:linkname directive. +// +// This is a demonstration that an importer package can linkname a non-exported +// function from an imported package. +// +//go:linkname doInternalThree github.com/gopherjs/gopherjs/tests/testdata/linkname/three.doInternalThree +func doInternalThree() string + +func DoAll() string { + result := "" + + DoOne() + "\n" + // Normal function call in the same package. + two.DoTwo() + "\n" + // Normal cross-package function call. + two.DoImportedOne() + "\n" + // Call a function that package two linknamed. + three.DoThree() + "\n" + // Normal cross-package function call. + "doing imported three: " + doInternalThree() + "\n" // Call a function from another package this package linknamed. + return result +} diff --git a/tests/testdata/linkname/three/three.go b/tests/testdata/linkname/three/three.go new file mode 100644 index 000000000..e705dc79b --- /dev/null +++ b/tests/testdata/linkname/three/three.go @@ -0,0 +1,19 @@ +package three + +func DoThree() string { + return "doing three" +} + +func init() { + // Avoid dead-code elimination. + // TODO(nevkontakte): This should not be necessary. + _ = doInternalThree +} + +var threeSecret = "three secret" + +// This function is unexported and can't be accessed by other packages via a +// conventional import. +func doInternalThree() string { + return "doing internal three: " + threeSecret +} diff --git a/tests/testdata/linkname/two/two.go b/tests/testdata/linkname/two/two.go new file mode 100644 index 000000000..42f8362b2 --- /dev/null +++ b/tests/testdata/linkname/two/two.go @@ -0,0 +1,22 @@ +package two + +import _ "unsafe" // for go:linkname + +func init() { + // Avoid dead-code elimination. + // TODO(nevkontakte): This should not be necessary. + _ = doInternalOne +} + +func DoTwo() string { + return "doing two" +} + +// The function below can't be imported from the package one the normal way because +// that would create an import cycle. +//go:linkname doInternalOne github.com/gopherjs/gopherjs/tests/testdata/linkname/one.doInternalOne +func doInternalOne() string + +func DoImportedOne() string { + return "doing imported one: " + doInternalOne() +} diff --git a/tests/testdata/time_inexternalization.go b/tests/testdata/time_inexternalization.go index fe7c064f8..99131b9b4 100644 --- a/tests/testdata/time_inexternalization.go +++ b/tests/testdata/time_inexternalization.go @@ -9,10 +9,10 @@ import ( var _ = time.Sleep // Force "time" package to be imported but let time.Time and time.Unix be DCEed since they're not used. func main() { - // Excercise externalization of Go struct (with its special handling of time.Time). + // Exercise externalization of Go struct (with its special handling of time.Time). js.Global.Get("console").Call("log", struct{ S string }{"externalization ok"}) - // Excercise internalization of JavaScript Date object (with its special handling of time.Time). + // Exercise internalization of JavaScript Date object (with its special handling of time.Time). date := js.Global.Get("Date").New("2015-08-29T20:56:00.869Z").Interface() js.Global.Set("myDate", date) js.Global.Get("console").Call("log", js.Global.Get("myDate").Call("toUTCString")) diff --git a/tests/vendor/vendored/vendored.go b/tests/vendor/vendored/vendored.go deleted file mode 100644 index f1e32d227..000000000 --- a/tests/vendor/vendored/vendored.go +++ /dev/null @@ -1,3 +0,0 @@ -package vendored - -var Answer = 42 diff --git a/tests/gorepo_test.go b/tests/vendored_test.go similarity index 55% rename from tests/gorepo_test.go rename to tests/vendored_test.go index 957db3e9f..f94d955d2 100644 --- a/tests/gorepo_test.go +++ b/tests/vendored_test.go @@ -7,31 +7,15 @@ import ( "testing" ) -// Go repository basic compiler tests, and regression tests for fixed compiler bugs. -func TestGoRepositoryCompilerTests(t *testing.T) { - if runtime.GOARCH == "js" { - t.Skip("test meant to be run using normal Go compiler (needs os/exec)") - } - - args := []string{"go", "run", "run.go", "-summary"} - if testing.Verbose() { - args = append(args, "-v") - } - cmd := exec.Command(args[0], args[1:]...) - cmd.Stdout = os.Stdout - cmd.Stderr = os.Stdout - err := cmd.Run() - if err != nil { - t.Fatal(err) - } -} - // Test that GopherJS can be vendored into a project, and then used to build Go programs. // See issue https://github.com/gopherjs/gopherjs/issues/415. func TestGopherJSCanBeVendored(t *testing.T) { - if runtime.GOARCH == "js" { + if runtime.GOOS == "js" { t.Skip("test meant to be run using normal Go compiler (needs os/exec)") } + if runtime.GOOS == "windows" { + t.Skip("test requires POSIX environment to run") + } cmd := exec.Command("sh", "gopherjsvendored_test.sh") cmd.Stderr = os.Stdout diff --git a/tool.go b/tool.go index ec5823d33..46d6a6edc 100644 --- a/tool.go +++ b/tool.go @@ -4,15 +4,10 @@ import ( "bytes" "errors" "fmt" - "go/ast" "go/build" - "go/doc" - "go/parser" "go/scanner" - "go/token" "go/types" "io" - "io/ioutil" "net" "net/http" "os" @@ -20,24 +15,25 @@ import ( "path" "path/filepath" "runtime" - "sort" + "runtime/pprof" "strconv" "strings" + "sync" "syscall" "text/template" "time" - "unicode" - "unicode/utf8" gbuild "github.com/gopherjs/gopherjs/build" + "github.com/gopherjs/gopherjs/build/cache" "github.com/gopherjs/gopherjs/compiler" + "github.com/gopherjs/gopherjs/internal/errorList" "github.com/gopherjs/gopherjs/internal/sysutil" - "github.com/kisielk/gotool" "github.com/neelance/sourcemap" + log "github.com/sirupsen/logrus" "github.com/spf13/cobra" "github.com/spf13/pflag" - "golang.org/x/crypto/ssh/terminal" - "golang.org/x/tools/go/buildutil" + "golang.org/x/sync/errgroup" + "golang.org/x/term" ) var currentDirectory string @@ -59,11 +55,16 @@ func init() { fmt.Fprintf(os.Stderr, "$GOPATH not set. For more details see: go help gopath\n") os.Exit(1) } + + e := gbuild.DefaultEnv() + if e.GOOS != "js" || e.GOARCH != "ecmascript" { + fmt.Fprintf(os.Stderr, "Using GOOS=%s and GOARCH=%s in GopherJS is deprecated and will be removed in future. Use GOOS=js GOARCH=ecmascript instead.\n", e.GOOS, e.GOARCH) + } } func main() { var ( - options = &gbuild.Options{CreateMapFile: true} + options = &gbuild.Options{} pkgObj string tags string ) @@ -75,9 +76,11 @@ func main() { compilerFlags := pflag.NewFlagSet("", 0) compilerFlags.BoolVarP(&options.Minify, "minify", "m", false, "minify generated code") - compilerFlags.BoolVar(&options.Color, "color", terminal.IsTerminal(int(os.Stderr.Fd())) && os.Getenv("TERM") != "dumb", "colored output") + compilerFlags.BoolVar(&options.Color, "color", term.IsTerminal(int(os.Stderr.Fd())) && os.Getenv("TERM") != "dumb", "colored output") compilerFlags.StringVar(&tags, "tags", "", "a list of build tags to consider satisfied during the build") compilerFlags.BoolVar(&options.MapToLocalDisk, "localmap", false, "use local paths for sourcemap") + compilerFlags.BoolVarP(&options.NoCache, "no_cache", "a", false, "rebuild all packages from scratch") + compilerFlags.BoolVarP(&options.CreateMapFile, "source_map", "s", true, "enable generation of source maps") flagWatch := pflag.NewFlagSet("", 0) flagWatch.BoolVarP(&options.Watch, "watch", "w", false, "watch for changes to the source files") @@ -91,13 +94,13 @@ func main() { cmdBuild.Flags().AddFlagSet(flagQuiet) cmdBuild.Flags().AddFlagSet(compilerFlags) cmdBuild.Flags().AddFlagSet(flagWatch) - cmdBuild.Run = func(cmd *cobra.Command, args []string) { + cmdBuild.RunE = func(cmd *cobra.Command, args []string) error { options.BuildTags = strings.Fields(tags) for { s, err := gbuild.NewSession(options) if err != nil { options.PrintError("%s\n", err) - os.Exit(1) + return err } err = func() error { @@ -124,23 +127,25 @@ func main() { return err } + xctx := gbuild.NewBuildContext(s.InstallSuffix(), options.BuildTags) // Expand import path patterns. - patternContext := gbuild.NewBuildContext("", options.BuildTags) - pkgs := (&gotool.Context{BuildContext: *patternContext}).ImportPaths(args) - + pkgs, err := xctx.Match(args) + if err != nil { + return fmt.Errorf("failed to expand patterns %v: %w", args, err) + } for _, pkgPath := range pkgs { if s.Watcher != nil { - pkg, err := gbuild.NewBuildContext(s.InstallSuffix(), options.BuildTags).Import(pkgPath, "", build.FindOnly) + pkg, err := xctx.Import(pkgPath, currentDirectory, build.FindOnly) if err != nil { return err } s.Watcher.Add(pkg.Dir) } - pkg, err := gbuild.Import(pkgPath, 0, s.InstallSuffix(), options.BuildTags) + pkg, err := xctx.Import(pkgPath, currentDirectory, 0) if err != nil { return err } - archive, err := s.BuildPackage(pkg) + archive, err := s.BuildProject(pkg) if err != nil { return err } @@ -157,10 +162,11 @@ func main() { } return nil }() - exitCode := handleError(err, options, nil) if s.Watcher == nil { - os.Exit(exitCode) + return err + } else if err != nil { + handleError(err, options, nil) } s.WaitForChange() } @@ -174,19 +180,21 @@ func main() { cmdInstall.Flags().AddFlagSet(flagQuiet) cmdInstall.Flags().AddFlagSet(compilerFlags) cmdInstall.Flags().AddFlagSet(flagWatch) - cmdInstall.Run = func(cmd *cobra.Command, args []string) { + cmdInstall.RunE = func(cmd *cobra.Command, args []string) error { options.BuildTags = strings.Fields(tags) for { s, err := gbuild.NewSession(options) if err != nil { - options.PrintError("%s\n", err) - os.Exit(1) + return err } err = func() error { // Expand import path patterns. - patternContext := gbuild.NewBuildContext("", options.BuildTags) - pkgs := (&gotool.Context{BuildContext: *patternContext}).ImportPaths(args) + xctx := gbuild.NewBuildContext(s.InstallSuffix(), options.BuildTags) + pkgs, err := xctx.Match(args) + if err != nil { + return fmt.Errorf("failed to expand patterns %v: %w", args, err) + } if cmd.Name() == "get" { goGet := exec.Command("go", append([]string{"get", "-d", "-tags=js"}, pkgs...)...) @@ -197,31 +205,31 @@ func main() { } } for _, pkgPath := range pkgs { - pkg, err := gbuild.Import(pkgPath, 0, s.InstallSuffix(), options.BuildTags) + pkg, err := xctx.Import(pkgPath, currentDirectory, 0) if s.Watcher != nil && pkg != nil { // add watch even on error s.Watcher.Add(pkg.Dir) } if err != nil { return err } - - archive, err := s.BuildPackage(pkg) + archive, err := s.BuildProject(pkg) if err != nil { return err } if pkg.IsCommand() && !pkg.UpToDate { - if err := s.WriteCommandPackage(archive, pkg.PkgObj); err != nil { + if err := s.WriteCommandPackage(archive, pkg.InstallPath()); err != nil { return err } } } return nil }() - exitCode := handleError(err, options, nil) if s.Watcher == nil { - os.Exit(exitCode) + return err + } else if err != nil { + handleError(err, options, nil) } s.WaitForChange() } @@ -231,14 +239,12 @@ func main() { Use: "doc [arguments]", Short: "display documentation for the requested, package, method or symbol", } - cmdDoc.Run = func(cmd *cobra.Command, args []string) { + cmdDoc.RunE = func(cmd *cobra.Command, args []string) error { goDoc := exec.Command("go", append([]string{"doc"}, args...)...) goDoc.Stdout = os.Stdout goDoc.Stderr = os.Stderr goDoc.Env = append(os.Environ(), "GOARCH=js") - err := goDoc.Run() - exitCode := handleError(err, options, nil) - os.Exit(exitCode) + return goDoc.Run() } cmdGet := &cobra.Command{ @@ -257,46 +263,42 @@ func main() { cmdRun.Flags().AddFlagSet(flagVerbose) cmdRun.Flags().AddFlagSet(flagQuiet) cmdRun.Flags().AddFlagSet(compilerFlags) - cmdRun.Run = func(cmd *cobra.Command, args []string) { - err := func() error { - lastSourceArg := 0 - for { - if lastSourceArg == len(args) || !(strings.HasSuffix(args[lastSourceArg], ".go") || strings.HasSuffix(args[lastSourceArg], ".inc.js")) { - break - } - lastSourceArg++ - } - if lastSourceArg == 0 { - return fmt.Errorf("gopherjs run: no go files listed") + cmdRun.RunE = func(cmd *cobra.Command, args []string) error { + options.BuildTags = strings.Fields(tags) + lastSourceArg := 0 + for { + if lastSourceArg == len(args) || !(strings.HasSuffix(args[lastSourceArg], ".go") || strings.HasSuffix(args[lastSourceArg], ".inc.js")) { + break } + lastSourceArg++ + } + if lastSourceArg == 0 { + return fmt.Errorf("gopherjs run: no go files listed") + } - tempfile, err := ioutil.TempFile(currentDirectory, filepath.Base(args[0])+".") - if err != nil && strings.HasPrefix(currentDirectory, runtime.GOROOT()) { - tempfile, err = ioutil.TempFile("", filepath.Base(args[0])+".") - } - if err != nil { - return err - } - defer func() { - tempfile.Close() - os.Remove(tempfile.Name()) - os.Remove(tempfile.Name() + ".map") - }() - s, err := gbuild.NewSession(options) - if err != nil { - return err - } - if err := s.BuildFiles(args[:lastSourceArg], tempfile.Name(), currentDirectory); err != nil { - return err - } - if err := runNode(tempfile.Name(), args[lastSourceArg:], "", options.Quiet); err != nil { - return err - } - return nil + tempfile, err := os.CreateTemp(currentDirectory, filepath.Base(args[0])+".") + if err != nil && strings.HasPrefix(currentDirectory, runtime.GOROOT()) { + tempfile, err = os.CreateTemp("", filepath.Base(args[0])+".") + } + if err != nil { + return err + } + defer func() { + tempfile.Close() + os.Remove(tempfile.Name()) + os.Remove(tempfile.Name() + ".map") }() - exitCode := handleError(err, options, nil) - - os.Exit(exitCode) + s, err := gbuild.NewSession(options) + if err != nil { + return err + } + if err := s.BuildFiles(args[:lastSourceArg], tempfile.Name(), currentDirectory); err != nil { + return err + } + if err := runNode(tempfile.Name(), args[lastSourceArg:], "", options.Quiet, nil); err != nil { + return err + } + return nil } cmdTest := &cobra.Command{ @@ -311,220 +313,192 @@ func main() { verbose := cmdTest.Flags().BoolP("verbose", "v", false, "Log all tests as they are run. Also print all text from Log and Logf calls even if the test succeeds.") compileOnly := cmdTest.Flags().BoolP("compileonly", "c", false, "Compile the test binary to pkg.test.js but do not run it (where pkg is the last element of the package's import path). The file name can be changed with the -o flag.") outputFilename := cmdTest.Flags().StringP("output", "o", "", "Compile the test binary to the named file. The test still runs (unless -c is specified).") + parallelTests := cmdTest.Flags().IntP("parallel", "p", runtime.NumCPU(), "Allow running tests in parallel for up to -p packages. Tests within the same package are still executed sequentially.") cmdTest.Flags().AddFlagSet(compilerFlags) - cmdTest.Run = func(cmd *cobra.Command, args []string) { + cmdTest.RunE = func(cmd *cobra.Command, args []string) error { options.BuildTags = strings.Fields(tags) - err := func() error { - // Expand import path patterns. - patternContext := gbuild.NewBuildContext("", options.BuildTags) - args = (&gotool.Context{BuildContext: *patternContext}).ImportPaths(args) - if *compileOnly && len(args) > 1 { - return errors.New("cannot use -c flag with multiple packages") + // Expand import path patterns. + patternContext := gbuild.NewBuildContext("", options.BuildTags) + matches, err := patternContext.Match(args) + if err != nil { + return fmt.Errorf("failed to expand patterns %v: %w", args, err) + } + + if *compileOnly && len(matches) > 1 { + return errors.New("cannot use -c flag with multiple packages") + } + if *outputFilename != "" && len(matches) > 1 { + return errors.New("cannot use -o flag with multiple packages") + } + if *parallelTests < 1 { + return errors.New("--parallel cannot be less than 1") + } + + parallelSlots := make(chan (bool), *parallelTests) // Semaphore for parallel test executions. + if len(matches) == 1 { + // Disable output buffering if testing only one package. + parallelSlots = make(chan (bool), 1) + } + executions := errgroup.Group{} + + pkgs := make([]*gbuild.PackageData, len(matches)) + for i, pkgPath := range matches { + var err error + pkgs[i], err = gbuild.Import(pkgPath, 0, "", options.BuildTags) + if err != nil { + return err + } + } + + var ( + exitErr error + exitErrMu = &sync.Mutex{} + ) + for _, pkg := range pkgs { + pkg := pkg // Capture for the goroutine. + if len(pkg.TestGoFiles) == 0 && len(pkg.XTestGoFiles) == 0 { + fmt.Printf("? \t%s\t[no test files]\n", pkg.ImportPath) + continue } - if *outputFilename != "" && len(args) > 1 { - return errors.New("cannot use -o flag with multiple packages") + localOpts := options + localOpts.TestedPackage = pkg.ImportPath + s, err := gbuild.NewSession(localOpts) + if err != nil { + return err } - pkgs := make([]*gbuild.PackageData, len(args)) - for i, pkgPath := range args { - var err error - pkgs[i], err = gbuild.Import(pkgPath, 0, "", options.BuildTags) - if err != nil { - return err - } + pkg.IsTest = true + mainPkgArchive, err := s.BuildProject(pkg) + if err != nil { + return fmt.Errorf("failed to compile testmain package for %s: %w", pkg.ImportPath, err) } - var exitErr error - for _, pkg := range pkgs { - if len(pkg.TestGoFiles) == 0 && len(pkg.XTestGoFiles) == 0 { - fmt.Printf("? \t%s\t[no test files]\n", pkg.ImportPath) - continue - } - s, err := gbuild.NewSession(options) + if *compileOnly && *outputFilename == "" { + *outputFilename = pkg.Package.Name + "_test.js" + } + + var outfile *os.File + if *outputFilename != "" { + outfile, err = os.Create(*outputFilename) if err != nil { return err } - - tests := &testFuncs{BuildContext: s.BuildContext(), Package: pkg.Package} - collectTests := func(testPkg *gbuild.PackageData, testPkgName string, needVar *bool) error { - if testPkgName == "_test" { - for _, file := range pkg.TestGoFiles { - if err := tests.load(pkg.Package.Dir, file, testPkgName, &tests.ImportTest, &tests.NeedTest); err != nil { - return err - } - } - } else { - for _, file := range pkg.XTestGoFiles { - if err := tests.load(pkg.Package.Dir, file, "_xtest", &tests.ImportXtest, &tests.NeedXtest); err != nil { - return err - } - } - } - _, err := s.BuildPackage(testPkg) + } else { + outfile, err = os.CreateTemp(currentDirectory, pkg.Package.Name+"_test.*.js") + if err != nil { return err } - - if err := collectTests(&gbuild.PackageData{ - Package: &build.Package{ - ImportPath: pkg.ImportPath, - Dir: pkg.Dir, - GoFiles: append(pkg.GoFiles, pkg.TestGoFiles...), - Imports: append(pkg.Imports, pkg.TestImports...), - }, - IsTest: true, - JSFiles: pkg.JSFiles, - }, "_test", &tests.NeedTest); err != nil { - return err + outfile.Close() // Release file handle early, we only need the name. + } + cleanupTemp := func() { + if *outputFilename == "" { + os.Remove(outfile.Name()) + os.Remove(outfile.Name() + ".map") } + } + defer cleanupTemp() // Safety net in case cleanup after execution doesn't happen. - if err := collectTests(&gbuild.PackageData{ - Package: &build.Package{ - ImportPath: pkg.ImportPath + "_test", - Dir: pkg.Dir, - GoFiles: pkg.XTestGoFiles, - Imports: pkg.XTestImports, - }, - IsTest: true, - }, "_xtest", &tests.NeedXtest); err != nil { - return err - } + if err := s.WriteCommandPackage(mainPkgArchive, outfile.Name()); err != nil { + return err + } - buf := new(bytes.Buffer) - if err := testmainTmpl.Execute(buf, tests); err != nil { - return err - } + if *compileOnly { + continue + } - fset := token.NewFileSet() - mainFile, err := parser.ParseFile(fset, "_testmain.go", buf, 0) - if err != nil { - return err - } + var args []string + if *bench != "" { + args = append(args, "-test.bench", *bench) + } + if *benchtime != "" { + args = append(args, "-test.benchtime", *benchtime) + } + if *count != "" { + args = append(args, "-test.count", *count) + } + if *run != "" { + args = append(args, "-test.run", *run) + } + if *short { + args = append(args, "-test.short") + } + if *verbose { + args = append(args, "-test.v") + } + executions.Go(func() error { + parallelSlots <- true // Acquire slot + defer func() { <-parallelSlots }() // Release slot - importContext := &compiler.ImportContext{ - Packages: s.Types, - Import: func(path string) (*compiler.Archive, error) { - if path == pkg.ImportPath || path == pkg.ImportPath+"_test" { - return s.Archives[path], nil - } - return s.BuildImportPath(path) - }, - } - mainPkgArchive, err := compiler.Compile("main", []*ast.File{mainFile}, fset, importContext, options.Minify) - if err != nil { - return err + status := "ok " + start := time.Now() + var testOut io.ReadWriter + if cap(parallelSlots) > 1 { + // If running in parallel, capture test output in a temporary buffer to avoid mixing + // output from different tests and print it later. + testOut = &bytes.Buffer{} } - if *compileOnly && *outputFilename == "" { - *outputFilename = pkg.Package.Name + "_test.js" - } + err := runNode(outfile.Name(), args, runTestDir(pkg), options.Quiet, testOut) - var outfile *os.File - if *outputFilename != "" { - outfile, err = os.Create(*outputFilename) - if err != nil { - return err - } - } else { - outfile, err = ioutil.TempFile(currentDirectory, "test.") - if err != nil { - return err - } - } - defer func() { - outfile.Close() - if *outputFilename == "" { - os.Remove(outfile.Name()) - os.Remove(outfile.Name() + ".map") - } - }() + cleanupTemp() // Eagerly cleanup temporary compiled files after execution. - if err := s.WriteCommandPackage(mainPkgArchive, outfile.Name()); err != nil { - return err - } - - if *compileOnly { - continue + if testOut != nil { + io.Copy(os.Stdout, testOut) } - var args []string - if *bench != "" { - args = append(args, "-test.bench", *bench) - } - if *benchtime != "" { - args = append(args, "-test.benchtime", *benchtime) - } - if *count != "" { - args = append(args, "-test.count", *count) - } - if *run != "" { - args = append(args, "-test.run", *run) - } - if *short { - args = append(args, "-test.short") - } - if *verbose { - args = append(args, "-test.v") - } - status := "ok " - start := time.Now() - if err := runNode(outfile.Name(), args, runTestDir(pkg), options.Quiet); err != nil { + if err != nil { if _, ok := err.(*exec.ExitError); !ok { return err } + exitErrMu.Lock() exitErr = err + exitErrMu.Unlock() status = "FAIL" } fmt.Printf("%s\t%s\t%.3fs\n", status, pkg.ImportPath, time.Since(start).Seconds()) - } - return exitErr - }() - exitCode := handleError(err, options, nil) - - os.Exit(exitCode) + return nil + }) + } + if err := executions.Wait(); err != nil { + return err + } + return exitErr } cmdServe := &cobra.Command{ Use: "serve [root]", Short: "compile on-the-fly and serve", } + cmdServe.Args = cobra.MaximumNArgs(1) cmdServe.Flags().AddFlagSet(flagVerbose) cmdServe.Flags().AddFlagSet(flagQuiet) cmdServe.Flags().AddFlagSet(compilerFlags) var addr string cmdServe.Flags().StringVarP(&addr, "http", "", ":8080", "HTTP bind address to serve") - cmdServe.Run = func(cmd *cobra.Command, args []string) { + cmdServe.RunE = func(cmd *cobra.Command, args []string) error { options.BuildTags = strings.Fields(tags) - dirs := append(filepath.SplitList(build.Default.GOPATH), gbuild.DefaultGOROOT) var root string - if len(args) > 1 { - cmdServe.HelpFunc()(cmd, args) - os.Exit(1) - } - if len(args) == 1 { root = args[0] } // Create a new session eagerly to check if it fails, and report the error right away. - // Otherwise users will see it only after trying to serve a package, which is a bad experience. + // Otherwise, users will see it only after trying to serve a package, which is a bad experience. _, err := gbuild.NewSession(options) if err != nil { - options.PrintError("%s\n", err) - os.Exit(1) + return err } sourceFiles := http.FileServer(serveCommandFileSystem{ serveRoot: root, options: options, - dirs: dirs, sourceMaps: make(map[string][]byte), }) ln, err := net.Listen("tcp", addr) if err != nil { - fmt.Fprintln(os.Stderr, err) - os.Exit(1) + return err } if tcpAddr := ln.Addr().(*net.TCPAddr); tcpAddr.IP.Equal(net.IPv4zero) || tcpAddr.IP.Equal(net.IPv6zero) { // Any available addresses. fmt.Printf("serving at http://localhost:%d and on port %d of any available addresses\n", tcpAddr.Port, tcpAddr.Port) @@ -532,29 +506,83 @@ func main() { fmt.Printf("serving at http://%s\n", tcpAddr) } fmt.Fprintln(os.Stderr, http.Serve(tcpKeepAliveListener{ln.(*net.TCPListener)}, sourceFiles)) + return nil } cmdVersion := &cobra.Command{ Use: "version", Short: "print GopherJS compiler version", + Args: cobra.ExactArgs(0), } cmdVersion.Run = func(cmd *cobra.Command, args []string) { - if len(args) > 0 { - cmdServe.HelpFunc()(cmd, args) - os.Exit(1) - } - fmt.Printf("GopherJS %s\n", compiler.Version) } + cmdClean := &cobra.Command{ + Use: "clean", + Short: "clean GopherJS build cache", + } + cmdClean.RunE = func(cmd *cobra.Command, args []string) error { + return cache.Clear() + } + rootCmd := &cobra.Command{ - Use: "gopherjs", - Long: "GopherJS is a tool for compiling Go source code to JavaScript.", + Use: "gopherjs", + Long: "GopherJS is a tool for compiling Go source code to JavaScript.", + SilenceUsage: true, + SilenceErrors: true, + } + rootCmd.AddCommand(cmdBuild, cmdGet, cmdInstall, cmdRun, cmdTest, cmdServe, cmdVersion, cmdDoc, cmdClean) + + { + var logLevel string + var cpuProfile string + var allocProfile string + rootCmd.PersistentFlags().StringVar(&logLevel, "log_level", log.ErrorLevel.String(), "Compiler log level (debug, info, warn, error, fatal, panic).") + rootCmd.PersistentFlags().StringVar(&cpuProfile, "cpu_profile", "", "Save GopherJS compiler CPU profile at the given path. If unset, profiling is disabled.") + rootCmd.PersistentFlags().StringVar(&allocProfile, "alloc_profile", "", "Save GopherJS compiler allocation profile at the given path. If unset, profiling is disabled.") + + rootCmd.PersistentPreRunE = func(cmd *cobra.Command, args []string) error { + lvl, err := log.ParseLevel(logLevel) + if err != nil { + return fmt.Errorf("invalid --log_level value %q: %w", logLevel, err) + } + log.SetLevel(lvl) + + if cpuProfile != "" { + f, err := os.Create(cpuProfile) + if err != nil { + return fmt.Errorf("failed to create CPU profile file at %q: %w", cpuProfile, err) + } + if err := pprof.StartCPUProfile(f); err != nil { + return fmt.Errorf("failed to start CPU profile: %w", err) + } + // Not closing the file here, since we'll be writing to it throughout + // the lifetime of the process. It will be closed automatically when + // the process terminates. + } + return nil + } + rootCmd.PersistentPostRunE = func(cmd *cobra.Command, args []string) error { + if cpuProfile != "" { + pprof.StopCPUProfile() + } + if allocProfile != "" { + f, err := os.Create(allocProfile) + if err != nil { + return fmt.Errorf("failed to create alloc profile file at %q: %w", allocProfile, err) + } + if err := pprof.Lookup("allocs").WriteTo(f, 0); err != nil { + return fmt.Errorf("failed to write alloc profile: %w", err) + } + f.Close() + } + return nil + } } - rootCmd.AddCommand(cmdBuild, cmdGet, cmdInstall, cmdRun, cmdTest, cmdServe, cmdVersion, cmdDoc) err := rootCmd.Execute() if err != nil { - os.Exit(2) + os.Exit(handleError(err, options, nil)) } } @@ -579,12 +607,12 @@ func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) { type serveCommandFileSystem struct { serveRoot string options *gbuild.Options - dirs []string sourceMaps map[string][]byte } func (fs serveCommandFileSystem) Open(requestName string) (http.File, error) { name := path.Join(fs.serveRoot, requestName[1:]) // requestName[0] == '/' + log.Printf("Request: %s", name) dir, file := path.Split(name) base := path.Base(dir) // base is parent folder name, which becomes the output file name. @@ -593,13 +621,14 @@ func (fs serveCommandFileSystem) Open(requestName string) (http.File, error) { isMap := file == base+".js.map" isIndex := file == "index.html" + // Create a new session to pick up changes to source code on disk. + // TODO(dmitshur): might be possible to get a single session to detect changes to source code on disk + s, err := gbuild.NewSession(fs.options) + if err != nil { + return nil, err + } + if isPkg || isMap || isIndex { - // Create a new session to pick up changes to source code on disk. - // TODO(dmitshur): might be possible to get a single session to detect changes to source code on disk - s, err := gbuild.NewSession(fs.options) - if err != nil { - return nil, err - } // If we're going to be serving our special files, make sure there's a Go command in this folder. pkg, err := gbuild.Import(path.Dir(name), 0, s.InstallSuffix(), fs.options.BuildTags) if err != nil || pkg.Name != "main" { @@ -613,20 +642,20 @@ func (fs serveCommandFileSystem) Open(requestName string) (http.File, error) { buf := new(bytes.Buffer) browserErrors := new(bytes.Buffer) err := func() error { - archive, err := s.BuildPackage(pkg) + archive, err := s.BuildProject(pkg) if err != nil { return err } sourceMapFilter := &compiler.SourceMapFilter{Writer: buf} m := &sourcemap.Map{File: base + ".js"} - sourceMapFilter.MappingCallback = gbuild.NewMappingCallback(m, fs.options.GOROOT, fs.options.GOPATH, fs.options.MapToLocalDisk) + sourceMapFilter.MappingCallback = s.SourceMappingCallback(m) - deps, err := compiler.ImportDependencies(archive, s.BuildImportPath) + deps, err := compiler.ImportDependencies(archive, s.ImportResolverFor("")) if err != nil { return err } - if err := compiler.WriteProgramCode(deps, sourceMapFilter); err != nil { + if err := compiler.WriteProgramCode(deps, sourceMapFilter, s.GoRelease()); err != nil { return err } @@ -650,19 +679,14 @@ func (fs serveCommandFileSystem) Open(requestName string) (http.File, error) { } } - for _, d := range fs.dirs { - dir := http.Dir(filepath.Join(d, "src")) - - f, err := dir.Open(name) - if err == nil { - return f, nil - } + // First try to serve the request with a root prefix supplied in the CLI. + if f, err := fs.serveSourceTree(s.XContext(), name); err == nil { + return f, nil + } - // source maps are served outside of serveRoot - f, err = dir.Open(requestName) - if err == nil { - return f, nil - } + // If that didn't work, try without the prefix. + if f, err := fs.serveSourceTree(s.XContext(), requestName); err == nil { + return f, nil } if isIndex { @@ -673,6 +697,24 @@ func (fs serveCommandFileSystem) Open(requestName string) (http.File, error) { return nil, os.ErrNotExist } +func (fs serveCommandFileSystem) serveSourceTree(xctx gbuild.XContext, reqPath string) (http.File, error) { + parts := strings.Split(path.Clean(reqPath), "/") + // Under Go Modules different packages can be located in different module + // directories, which no longer align with import paths. + // + // We don't know which part of the requested path is package import path and + // which is a path under the package directory, so we try different split + // points until the package is found successfully. + for i := len(parts); i > 0; i-- { + pkgPath := path.Clean(path.Join(parts[:i]...)) + filePath := path.Clean(path.Join(parts[i:]...)) + if pkg, err := xctx.Import(pkgPath, ".", build.FindOnly); err == nil { + return http.Dir(pkg.Dir).Open(filePath) + } + } + return nil, os.ErrNotExist +} + type fakeFile struct { name string size int @@ -725,7 +767,7 @@ func handleError(err error, options *gbuild.Options, browserErrors *bytes.Buffer switch err := err.(type) { case nil: return 0 - case compiler.ErrorList: + case errorList.ErrorList: for _, entry := range err { printError(entry, options, browserErrors) } @@ -769,16 +811,12 @@ func sprintError(err error) string { // runNode runs script with args using Node.js in directory dir. // If dir is empty string, current directory is used. -func runNode(script string, args []string, dir string, quiet bool) error { +// Is out is not nil, process stderr and stdout are redirected to it, otherwise +// os.Stdout and os.Stderr are used. +func runNode(script string, args []string, dir string, quiet bool, out io.Writer) error { var allArgs []string if b, _ := strconv.ParseBool(os.Getenv("SOURCE_MAP_SUPPORT")); os.Getenv("SOURCE_MAP_SUPPORT") == "" || b { - allArgs = []string{"--require", "source-map-support/register"} - if err := exec.Command("node", "--require", "source-map-support/register", "--eval", "").Run(); err != nil { - if !quiet { - fmt.Fprintln(os.Stderr, "gopherjs: Source maps disabled. Install source-map-support module for nice stack traces. See https://github.com/gopherjs/gopherjs#gopherjs-run-gopherjs-test.") - } - allArgs = []string{} - } + allArgs = []string{"--enable-source-maps"} } if runtime.GOOS != "windows" { @@ -791,9 +829,11 @@ func runNode(script string, args []string, dir string, quiet bool) error { // - OS process limit // - Node.js (V8) limit // - // GopherJS fetches the current OS process limit, and sets the - // Node.js limit to the same value. So both limits are kept in sync - // and can be controlled by setting OS process limit. E.g.: + // GopherJS fetches the current OS process limit, and sets the Node.js limit + // to a value slightly below it (otherwise nodejs is likely to segfault). + // The backoff size has been determined experimentally on a linux machine, + // so it may not be 100% reliable. So both limits are kept in sync and can + // be controlled by setting OS process limit. E.g.: // // ulimit -s 10000 && gopherjs test // @@ -801,7 +841,12 @@ func runNode(script string, args []string, dir string, quiet bool) error { if err != nil { return fmt.Errorf("failed to get stack size limit: %v", err) } - allArgs = append(allArgs, fmt.Sprintf("--stack_size=%v", cur/1000)) // Convert from bytes to KB. + cur = cur / 1024 // Convert bytes to KiB. + defaultSize := uint64(984) // --stack-size default value. + if backoff := uint64(64); cur > defaultSize+backoff { + cur = cur - backoff + } + allArgs = append(allArgs, fmt.Sprintf("--stack_size=%v", cur)) } allArgs = append(allArgs, script) @@ -810,8 +855,13 @@ func runNode(script string, args []string, dir string, quiet bool) error { node := exec.Command("node", allArgs...) node.Dir = dir node.Stdin = os.Stdin - node.Stdout = os.Stdout - node.Stderr = os.Stderr + if out != nil { + node.Stdout = out + node.Stderr = out + } else { + node.Stdout = os.Stdout + node.Stderr = os.Stderr + } err := node.Run() if _, ok := err.(*exec.ExitError); err != nil && !ok { err = fmt.Errorf("could not run Node.js: %s", err.Error()) @@ -829,161 +879,3 @@ func runTestDir(p *gbuild.PackageData) string { // Run tests in the package directory. return p.Dir } - -type testFuncs struct { - BuildContext *build.Context - Tests []testFunc - Benchmarks []testFunc - Examples []testFunc - TestMain *testFunc - Package *build.Package - ImportTest bool - NeedTest bool - ImportXtest bool - NeedXtest bool -} - -type testFunc struct { - Package string // imported package name (_test or _xtest) - Name string // function name - Output string // output, for examples - Unordered bool // output is allowed to be unordered. -} - -var testFileSet = token.NewFileSet() - -func (t *testFuncs) load(dir, file, pkg string, doImport, seen *bool) error { - f, err := buildutil.ParseFile(testFileSet, t.BuildContext, nil, dir, file, parser.ParseComments) - if err != nil { - return err - } - for _, d := range f.Decls { - n, ok := d.(*ast.FuncDecl) - if !ok { - continue - } - if n.Recv != nil { - continue - } - name := n.Name.String() - switch { - case isTestMain(n): - if t.TestMain != nil { - return errors.New("multiple definitions of TestMain") - } - t.TestMain = &testFunc{pkg, name, "", false} - *doImport, *seen = true, true - case isTest(name, "Test"): - t.Tests = append(t.Tests, testFunc{pkg, name, "", false}) - *doImport, *seen = true, true - case isTest(name, "Benchmark"): - t.Benchmarks = append(t.Benchmarks, testFunc{pkg, name, "", false}) - *doImport, *seen = true, true - } - } - ex := doc.Examples(f) - sort.Sort(byOrder(ex)) - for _, e := range ex { - *doImport = true // import test file whether executed or not - if e.Output == "" && !e.EmptyOutput { - // Don't run examples with no output. - continue - } - t.Examples = append(t.Examples, testFunc{pkg, "Example" + e.Name, e.Output, e.Unordered}) - *seen = true - } - - return nil -} - -type byOrder []*doc.Example - -func (x byOrder) Len() int { return len(x) } -func (x byOrder) Swap(i, j int) { x[i], x[j] = x[j], x[i] } -func (x byOrder) Less(i, j int) bool { return x[i].Order < x[j].Order } - -// isTestMain tells whether fn is a TestMain(m *testing.M) function. -func isTestMain(fn *ast.FuncDecl) bool { - if fn.Name.String() != "TestMain" || - fn.Type.Results != nil && len(fn.Type.Results.List) > 0 || - fn.Type.Params == nil || - len(fn.Type.Params.List) != 1 || - len(fn.Type.Params.List[0].Names) > 1 { - return false - } - ptr, ok := fn.Type.Params.List[0].Type.(*ast.StarExpr) - if !ok { - return false - } - // We can't easily check that the type is *testing.M - // because we don't know how testing has been imported, - // but at least check that it's *M or *something.M. - if name, ok := ptr.X.(*ast.Ident); ok && name.Name == "M" { - return true - } - if sel, ok := ptr.X.(*ast.SelectorExpr); ok && sel.Sel.Name == "M" { - return true - } - return false -} - -// isTest tells whether name looks like a test (or benchmark, according to prefix). -// It is a Test (say) if there is a character after Test that is not a lower-case letter. -// We don't want TesticularCancer. -func isTest(name, prefix string) bool { - if !strings.HasPrefix(name, prefix) { - return false - } - if len(name) == len(prefix) { // "Test" is ok - return true - } - rune, _ := utf8.DecodeRuneInString(name[len(prefix):]) - return !unicode.IsLower(rune) -} - -var testmainTmpl = template.Must(template.New("main").Parse(` -package main - -import ( -{{if not .TestMain}} - "os" -{{end}} - "testing" - "testing/internal/testdeps" - -{{if .ImportTest}} - {{if .NeedTest}}_test{{else}}_{{end}} {{.Package.ImportPath | printf "%q"}} -{{end}} -{{if .ImportXtest}} - {{if .NeedXtest}}_xtest{{else}}_{{end}} {{.Package.ImportPath | printf "%s_test" | printf "%q"}} -{{end}} -) - -var tests = []testing.InternalTest{ -{{range .Tests}} - {"{{.Name}}", {{.Package}}.{{.Name}}}, -{{end}} -} - -var benchmarks = []testing.InternalBenchmark{ -{{range .Benchmarks}} - {"{{.Name}}", {{.Package}}.{{.Name}}}, -{{end}} -} - -var examples = []testing.InternalExample{ -{{range .Examples}} - {"{{.Name}}", {{.Package}}.{{.Name}}, {{.Output | printf "%q"}}, {{.Unordered}}}, -{{end}} -} - -func main() { - m := testing.MainStart(testdeps.TestDeps{}, tests, benchmarks, examples) -{{with .TestMain}} - {{.Package}}.{{.Name}}(m) -{{else}} - os.Exit(m.Run()) -{{end}} -} - -`))