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master
test/fixedbugs/issue57823.go
76 строк
1 KB
Cuong Manh Le
cmd/compile: fix unsafe.{SliceData,StringData} escape analysis memory corruption
18 янв 2023, 04:27
18 янв 2023, 04:27
198074a
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// run // Copyright 2023 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. package main import ( "runtime" "unsafe" ) //go:noinline func g(x *byte) *byte { return x } func main() { slice() str("AAAAAAAA", "BBBBBBBBB") } func wait(done <-chan struct{}) bool { for i := 0; i < 10; i++ { runtime.GC() select { case <-done: return true default: } } return false } func slice() { s := make([]byte, 100) s[0] = 1 one := unsafe.SliceData(s) done := make(chan struct{}) runtime.SetFinalizer(one, func(*byte) { close(done) }) h := g(one) if wait(done) { panic("GC'd early") } if *h != 1 { panic("lost one") } if !wait(done) { panic("never GC'd") } } var strDone = make(chan struct{}) //go:noinline func str(x, y string) { s := x + y // put in temporary on stack p := unsafe.StringData(s) runtime.SetFinalizer(p, func(*byte) { close(strDone) }) if wait(strDone) { panic("GC'd early") } if *p != 'A' { panic("lost p") } if !wait(strDone) { panic("never GC'd") } }