go issue8004 源码
golang issue8004 代码
文件路径：/test/fixedbugs/issue8004.go
// run
// Copyright 2014 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 (
"reflect"
"runtime"
"unsafe"
)
func main() {
test1()
test2()
}
func test1() {
var all []interface{}
for i := 0; i < 100; i++ {
p := new([]int)
*p = append(*p, 1, 2, 3, 4)
h := (*reflect.SliceHeader)(unsafe.Pointer(p))
all = append(all, h, p)
}
runtime.GC()
for i := 0; i < 100; i++ {
p := *all[2*i+1].(*[]int)
if p[0] != 1 || p[1] != 2 || p[2] != 3 || p[3] != 4 {
println("BUG test1: bad slice at index", i, p[0], p[1], p[2], p[3])
return
}
}
}
type T struct {
H *reflect.SliceHeader
P *[]int
}
func test2() {
var all []T
for i := 0; i < 100; i++ {
p := new([]int)
*p = append(*p, 1, 2, 3, 4)
h := (*reflect.SliceHeader)(unsafe.Pointer(p))
all = append(all, T{H: h}, T{P: p})
}
runtime.GC()
for i := 0; i < 100; i++ {
p := *all[2*i+1].P
if p[0] != 1 || p[1] != 2 || p[2] != 3 || p[3] != 4 {
println("BUG test2: bad slice at index", i, p[0], p[1], p[2], p[3])
return
}
}
}
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