compiler/natives/src/reflect: Implement throw.

dmitshur · dmitshur · commit 9d5176b3c1a2 · 2018-02-16T12:51:56.000-05:00
It's being used in a few places, and previously had no implementation
in GopherJS. (In upstream Go, it's being provided by runtime via
go:linkname directive.)

This restores more helpful error messages as in GopherJS 1.9.

Before:

	runtime error: native function not implemented: sync.throw

After:

	runtime error: sync: inconsistent mutex state
diff --git a/compiler/natives/src/sync/sync.go b/compiler/natives/src/sync/sync.go
@@ -73,3 +73,8 @@ func runtime_nanotime() int64 {
 	const millisecond = 1000000
 	return js.Global.Get("Date").New().Call("getTime").Int64() * millisecond
 }
+
+// Implemented in runtime.
+func throw(s string) {
+	js.Global.Call("$throwRuntimeError", s)
+}

Original file line number	Diff line number	Diff line change
`@@ -73,3 +73,8 @@ func runtime_nanotime() int64 {`
`73`	`73`	`const millisecond = 1000000`
`74`	`74`	`return js.Global.Get("Date").New().Call("getTime").Int64() * millisecond`
`75`	`75`	`}`
	`76`	`+`
	`77`	`+// Implemented in runtime.`
	`78`	`+func throw(s string) {`
	`79`	`+ js.Global.Call("$throwRuntimeError", s)`
	`80`	`+}`