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https://github.com/golang/go
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0ee9c46cb1
Fixes #19168. Change-Id: I3f4fcc0b189c53819ac29ef8de86fdad76a17488 Reviewed-on: https://go-review.googlesource.com/37663 Reviewed-by: Keith Randall <khr@golang.org>
59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
// errorcheck -0 -l -d=wb
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package p
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import (
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"reflect"
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"unsafe"
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reflect2 "reflect"
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)
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func sink(e interface{})
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func a(hdr *reflect.SliceHeader, p *byte) {
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hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
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}
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func b(hdr *reflect.StringHeader, p *byte) {
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hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
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}
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func c(hdrs *[1]reflect.SliceHeader, p *byte) {
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hdrs[0].Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
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}
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func d(hdr *struct{ s reflect.StringHeader }, p *byte) {
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hdr.s.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
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}
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func e(p *byte) (resHeap, resStack string) {
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sink(&resHeap)
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hdr := (*reflect.StringHeader)(unsafe.Pointer(&resHeap))
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hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
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// No write barrier for non-escaping stack vars.
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hdr = (*reflect.StringHeader)(unsafe.Pointer(&resStack))
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hdr.Data = uintptr(unsafe.Pointer(p))
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return
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}
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func f(hdr *reflect2.SliceHeader, p *byte) {
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hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
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}
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type SliceHeader struct {
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Data uintptr
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}
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func g(hdr *SliceHeader, p *byte) {
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// No write barrier for lookalike SliceHeader.
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hdr.Data = uintptr(unsafe.Pointer(p))
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}
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