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https://github.com/golang/go
synced 2024-11-23 10:30:03 -07:00
198074abd7
Fixes #57823 Change-Id: I54654d3ecb20b75afa9052c5c9db2072a86188d4 Reviewed-on: https://go-review.googlesource.com/c/go/+/461759 Reviewed-by: Cherry Mui <cherryyz@google.com> Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Keith Randall <khr@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
77 lines
1.1 KiB
Go
77 lines
1.1 KiB
Go
// run
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// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"runtime"
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"unsafe"
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)
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//go:noinline
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func g(x *byte) *byte { return x }
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func main() {
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slice()
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str("AAAAAAAA", "BBBBBBBBB")
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}
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func wait(done <-chan struct{}) bool {
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for i := 0; i < 10; i++ {
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runtime.GC()
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select {
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case <-done:
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return true
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default:
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}
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}
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return false
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}
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func slice() {
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s := make([]byte, 100)
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s[0] = 1
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one := unsafe.SliceData(s)
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done := make(chan struct{})
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runtime.SetFinalizer(one, func(*byte) { close(done) })
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h := g(one)
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if wait(done) {
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panic("GC'd early")
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}
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if *h != 1 {
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panic("lost one")
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}
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if !wait(done) {
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panic("never GC'd")
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}
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}
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var strDone = make(chan struct{})
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//go:noinline
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func str(x, y string) {
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s := x + y // put in temporary on stack
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p := unsafe.StringData(s)
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runtime.SetFinalizer(p, func(*byte) { close(strDone) })
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if wait(strDone) {
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panic("GC'd early")
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}
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if *p != 'A' {
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panic("lost p")
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}
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if !wait(strDone) {
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panic("never GC'd")
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}
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}
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