go issue34723 源码
golang issue34723 代码
文件路径：/test/fixedbugs/issue34723.go
// errorcheck -0 -d=wb
// Copyright 2019 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.
// Make sure we don't introduce write barriers where we
// don't need them. These cases are writing pointers to
// globals to zeroed memory.
package main
func f1() []string {
return []string{"a"}
}
func f2() []string {
return []string{"a", "b"}
}
type T struct {
a [6]*int
}
func f3() *T {
t := new(T)
t.a[0] = &g
t.a[1] = &g
t.a[2] = &g
t.a[3] = &g
t.a[4] = &g
t.a[5] = &g
return t
}
func f4() *T {
t := new(T)
t.a[5] = &g
t.a[4] = &g
t.a[3] = &g
t.a[2] = &g
t.a[1] = &g
t.a[0] = &g
return t
}
func f5() *T {
t := new(T)
t.a[4] = &g
t.a[2] = &g
t.a[0] = &g
t.a[3] = &g
t.a[1] = &g
t.a[5] = &g
return t
}
type U struct {
a [65]*int
}
func f6() *U {
u := new(U)
u.a[63] = &g
// This offset is too large: we only track the first 64 pointers for zeroness.
u.a[64] = &g // ERROR "write barrier"
return u
}
var g int
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