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master
test/fixedbugs/issue45045.go
51 строка
997 B
Cuong Manh Le
runtime: overwrite existing keys for mapassign_faststr variant
28 мар 2021, 06:27
28 мар 2021, 06:27
23ffb5b
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// run // Copyright 2021 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 ( "reflect" "runtime" "unsafe" ) func k(c chan string, val string) string { b := make([]byte, 1000) runtime.SetFinalizer(&b[0], func(*byte) { c <- val }) var s string h := (*reflect.StringHeader)(unsafe.Pointer(&s)) h.Data = uintptr(unsafe.Pointer(&b[0])) h.Len = len(b) return s } func main() { { c := make(chan string, 2) m := make(map[string]int) m[k(c, "first")] = 0 m[k(c, "second")] = 0 runtime.GC() if s := <-c; s != "first" { panic("map[string], second key did not retain.") } runtime.KeepAlive(m) } { c := make(chan string, 2) m := make(map[[2]string]int) m[[2]string{k(c, "first")}] = 0 m[[2]string{k(c, "second")}] = 0 runtime.GC() if s := <-c; s != "first" { panic("map[[2]string], second key did not retain.") } runtime.KeepAlive(m) } }