mirror of
https://github.com/golang/go
synced 2024-11-23 02:00:03 -07:00
34 lines
602 B
Go
34 lines
602 B
Go
|
// +build amd64p32
|
||
|
|
// run
|
||
|
|
|
||
|
|
// Copyright 2018 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 (
|
||
|
|
"bytes"
|
||
|
|
"fmt"
|
||
|
|
"unsafe"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
b := make([]byte, 128)
|
||
|
|
for i := range b {
|
||
|
|
b[i] = 1
|
||
|
|
}
|
||
|
|
if bytes.IndexByte(b, 0) != -1 {
|
||
|
|
panic("found 0")
|
||
|
|
}
|
||
|
|
for i := range b {
|
||
|
|
b[i] = 0
|
||
|
|
c := b
|
||
|
|
*(*int)(unsafe.Pointer(uintptr(unsafe.Pointer(&c)) + unsafe.Sizeof(uintptr(0)))) = 1<<31 - 1
|
||
|
|
if bytes.IndexByte(c, 0) != i {
|
||
|
|
panic(fmt.Sprintf("missing 0 at %d\n", i))
|
||
|
|
}
|
||
|
|
b[i] = 1
|
||
|
|
}
|
||
|
|
}
|