1// errorcheck -0 -l -d=wb
2
3// Copyright 2017 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7package p
8
9import (
10	"reflect"
11	"unsafe"
12
13	reflect2 "reflect"
14)
15
16func sink(e interface{})
17
18func a(hdr *reflect.SliceHeader, p *byte) {
19	hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
20}
21
22func b(hdr *reflect.StringHeader, p *byte) {
23	hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
24}
25
26func c(hdrs *[1]reflect.SliceHeader, p *byte) {
27	hdrs[0].Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
28}
29
30func d(hdr *struct{ s reflect.StringHeader }, p *byte) {
31	hdr.s.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
32}
33
34func e(p *byte) (resHeap, resStack string) {
35	sink(&resHeap)
36
37	hdr := (*reflect.StringHeader)(unsafe.Pointer(&resHeap))
38	hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
39
40	// No write barrier for non-escaping stack vars.
41	hdr = (*reflect.StringHeader)(unsafe.Pointer(&resStack))
42	hdr.Data = uintptr(unsafe.Pointer(p))
43
44	return
45}
46
47func f(hdr *reflect2.SliceHeader, p *byte) {
48	hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier"
49}
50
51type SliceHeader struct {
52	Data uintptr
53}
54
55func g(hdr *SliceHeader, p *byte) {
56	// No write barrier for lookalike SliceHeader.
57	hdr.Data = uintptr(unsafe.Pointer(p))
58}
59