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master
test/fixedbugs/issue19168.go
58 строк
1 KB
Matthew Dempsky
cmd/compile: add missing WBs for reflect.{Slice,String}Header.Data
02 мар 2017, 20:21
02 мар 2017, 20:21
0ee9c46
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// 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)) }