| // 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) |
| } |
