1
0
mirror of https://github.com/golang/go synced 2024-11-22 17:35:19 -07:00
go/test/fixedbugs/bug320.go
Russ Cox 8a2891fc56 gc: select receive bug fix
Affects receive using := when new variable escapes to heap.

Fixes #1468.

R=ken2
CC=golang-dev
https://golang.org/cl/4119052
2011-02-02 18:34:09 -05:00

46 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) {
}