mirror of
https://github.com/golang/go.git
synced 2025-10-31 16:50:58 +00:00
8a2891fc56
Affects receive using := when new variable escapes to heap. Fixes #1468. R=ken2 CC=golang-dev https://golang.org/cl/4119052
45 lines
996 B
Go
45 lines
996 B
Go
// $G $D/$F.go && $L $F.$A && ./$A.out
|
|
|
|
// Copyright 2011 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
|
|
|
|
func main() {
|
|
c := make(chan int, 1)
|
|
dummy := make(chan int)
|
|
v := 0x12345678
|
|
for i := 0; i < 10; i++ {
|
|
// 6g had a bug that caused select to pass &t to
|
|
// selectrecv before allocating the memory for t,
|
|
// which caused non-deterministic crashes.
|
|
// This test looks for the bug by checking that the
|
|
// value received actually ends up in t.
|
|
// If the allocation happens after storing through
|
|
// whatever garbage &t holds, the later reference
|
|
// to t in the case body will use the new pointer and
|
|
// not see the received value.
|
|
v += 0x1020304
|
|
c <- v
|
|
select {
|
|
case t := <-c:
|
|
go func() {
|
|
f(t)
|
|
}()
|
|
escape(&t)
|
|
if t != v {
|
|
println(i, v, t)
|
|
panic("wrong values")
|
|
}
|
|
case dummy <- 1:
|
|
}
|
|
}
|
|
}
|
|
|
|
func escape(*int) {
|
|
}
|
|
|
|
func f(int) {
|
|
}
|
|
|