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 7 package p 8 9 import ( 10 "reflect" 11 "unsafe" 12 13 reflect2 "reflect" 14 ) 15 16 func sink(e interface{}) 17 18 func a(hdr *reflect.SliceHeader, p *byte) { 19 hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier" 20 } 21 22 func b(hdr *reflect.StringHeader, p *byte) { 23 hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier" 24 } 25 26 func c(hdrs *[1]reflect.SliceHeader, p *byte) { 27 hdrs[0].Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier" 28 } 29 30 func d(hdr *struct{ s reflect.StringHeader }, p *byte) { 31 hdr.s.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier" 32 } 33 34 func 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 47 func f(hdr *reflect2.SliceHeader, p *byte) { 48 hdr.Data = uintptr(unsafe.Pointer(p)) // ERROR "write barrier" 49 } 50 51 type SliceHeader struct { 52 Data uintptr 53 } 54 55 func g(hdr *SliceHeader, p *byte) { 56 // No write barrier for lookalike SliceHeader. 57 hdr.Data = uintptr(unsafe.Pointer(p)) 58 } 59
