mirror of
https://github.com/golang/go
synced 2024-11-23 07:00:05 -07:00
30 lines
680 B
Go
30 lines
680 B
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2017 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 "runtime/debug"
|
||
|
|
|
||
|
|
type T struct {
|
||
|
|
// >= 16 bytes to avoid tiny alloc.
|
||
|
|
a, b int
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
debug.SetGCPercent(1)
|
||
|
|
for i := 0; i < 100000; i++ {
|
||
|
|
m := make(map[*T]struct{}, 0)
|
||
|
|
for j := 0; j < 20; j++ {
|
||
|
|
// During the call to mapassign_fast64, the key argument
|
||
|
|
// was incorrectly treated as a uint64. If the stack was
|
||
|
|
// scanned during that call, the only pointer to k was
|
||
|
|
// missed, leading to *k being collected prematurely.
|
||
|
|
k := new(T)
|
||
|
|
m[k] = struct{}{}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|