| // run | |
| // Copyright 2015 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. | |
| // issue 10253: cmd/gc: incorrect escape analysis of closures | |
| // Partial call x.foo was not promoted to heap. | |
| package main | |
| func main() { | |
| c := make(chan bool) | |
| // Create a new goroutine to get a default-size stack segment. | |
| go func() { | |
| x := new(X) | |
| clos(x.foo)() | |
| c <- true | |
| }() | |
| <-c | |
| } | |
| type X int | |
| func (x *X) foo() { | |
| } | |
| func clos(x func()) func() { | |
| f := func() { | |
| print("") | |
| x() // This statement crashed, because the partial call was allocated on the old stack. | |
| } | |
| // Grow stack so that partial call x becomes invalid if allocated on stack. | |
| growstack(10000) | |
| c := make(chan bool) | |
| // Spoil the previous stack segment. | |
| go func() { | |
| c <- true | |
| }() | |
| <-c | |
| return f | |
| } | |
| func growstack(x int) { | |
| if x == 0 { | |
| return | |
| } | |
| growstack(x - 1) | |
| } |