mirror of
https://github.com/golang/go
synced 2024-11-26 05:17:58 -07:00
59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
|
// errorcheck -0 -l -d=wb
|
||
|
|
|
||
|
|
// 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 p
|
||
|
|
|
||
|
|
import (
|
||
|
|
"reflect"
|
||
|
|
"unsafe"
|
||
|
|
|
||
|
|
reflect2 "reflect"
|
||
|
|
)
|
||
|
|
|
||
|
|
func sink(e interface{})
|
||
|
|
|
||
|
|
func a(hdr *reflect.SliceHeader, p *byte) {
|
||
|
|
hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
|
||
|
|
}
|
||
|
|
|
||
|
|
func b(hdr *reflect.StringHeader, p *byte) {
|
||
|
|
hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
|
||
|
|
}
|
||
|
|
|
||
|
|
func c(hdrs *[1]reflect.SliceHeader, p *byte) {
|
||
|
|
hdrs[0].Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
|
||
|
|
}
|
||
|
|
|
||
|
|
func d(hdr *struct{ s reflect.StringHeader }, p *byte) {
|
||
|
|
hdr.s.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
|
||
|
|
}
|
||
|
|
|
||
|
|
func e(p *byte) (resHeap, resStack string) {
|
||
|
|
sink(&resHeap)
|
||
|
|
|
||
|
|
hdr := (*reflect.StringHeader)(unsafe.Pointer(&resHeap))
|
||
|
|
hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
|
||
|
|
|
||
|
|
// No write barrier for non-escaping stack vars.
|
||
|
|
hdr = (*reflect.StringHeader)(unsafe.Pointer(&resStack))
|
||
|
|
hdr.Data = uintptr(unsafe.Pointer(p))
|
||
|
|
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func f(hdr *reflect2.SliceHeader, p *byte) {
|
||
|
|
hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
|
||
|
|
}
|
||
|
|
|
||
|
|
type SliceHeader struct {
|
||
|
|
Data uintptr
|
||
|
|
}
|
||
|
|
|
||
|
|
func g(hdr *SliceHeader, p *byte) {
|
||
|
|
// No write barrier for lookalike SliceHeader.
|
||
|
|
hdr.Data = uintptr(unsafe.Pointer(p))
|
||
|
|
}
|