compiler/natives/src/reflect: Implement throw.

dmitshur · dmitshur · commit 0d1476f7bf4c · 2018-01-09T18:22:07.000-05:00
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
@@ -53,3 +53,8 @@ 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
`@@ -53,3 +53,8 @@ func runtime_nanotime() int64 {`
`53`	`53`	`const millisecond = 1000000`
`54`	`54`	`return js.Global.Get("Date").New().Call("getTime").Int64() * millisecond`
`55`	`55`	`}`
	`56`	`+`
	`57`	`+// Implemented in runtime.`
	`58`	`+func throw(s string) {`
	`59`	`+ js.Global.Call("$throwRuntimeError", s)`
	`60`	`+}`