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master
test/fixedbugs/issue30977.go
52 строки
865 B
Cherry Zhang
cmd/compile: copy volatile values before emitting write barrier call
22 мар 2019, 00:05
22 мар 2019, 00:05
f23c601
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// run // Copyright 2019 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. // Issue 30977: write barrier call clobbers volatile // value when there are multiple uses of the value. package main import "runtime" type T struct { a, b, c, d, e string } //go:noinline func g() T { return T{"a", "b", "c", "d", "e"} } //go:noinline func f() { // The compiler optimizes this to direct copying // the call result to both globals, with write // barriers. The first write barrier call clobbers // the result of g on stack. X = g() Y = X } var X, Y T const N = 1000 func main() { // Keep GC running so the write barrier is on. go func() { for { runtime.GC() } }() for i := 0; i < N; i++ { runtime.Gosched() f() if X != Y { panic("FAIL") } } }