go issue24491b 源码
golang issue24491b 代码
文件路径：/test/fixedbugs/issue24491b.go
// run
// Copyright 2020 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.
// This test makes sure unsafe-uintptr arguments are not
// kept alive longer than expected.
package main
import (
"runtime"
"unsafe"
)
var done = make(chan bool)
func setup() unsafe.Pointer {
s := "ok"
runtime.SetFinalizer(&s, func(p *string) { close(done) })
return unsafe.Pointer(&s)
}
//go:noinline
//go:uintptrescapes
func before(p uintptr) int {
runtime.GC()
select {
case <-done:
panic("GC early")
default:
}
return 0
}
func after() int {
runtime.GC()
runtime.GC()
<-done
return 0
}
func main() {
_ = before(uintptr(setup())) + after()
}
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