go nowritebarrier 源码
golang nowritebarrier 代码
文件路径：/test/nowritebarrier.go
// errorcheck -+
// Copyright 2016 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.
// Test go:nowritebarrier and related directives.
package p
type t struct {
f *t
}
var x t
var y *t
//go:nowritebarrier
func a1() {
x.f = y // ERROR "write barrier prohibited"
a2() // no error
}
//go:noinline
func a2() {
x.f = y
}
//go:nowritebarrierrec
func b1() {
b2()
}
//go:noinline
func b2() {
x.f = y // ERROR "write barrier prohibited by caller"
}
// Test recursive cycles through nowritebarrierrec and yeswritebarrierrec.
//go:nowritebarrierrec
func c1() {
c2()
}
//go:yeswritebarrierrec
func c2() {
c3()
}
func c3() {
x.f = y
c4()
}
//go:nowritebarrierrec
func c4() {
c2()
}
//go:nowritebarrierrec
func d1() {
d2()
}
func d2() {
d3()
}
//go:noinline
func d3() {
x.f = y // ERROR "write barrier prohibited by caller"
d4()
}
//go:yeswritebarrierrec
func d4() {
d2()
}
//go:noinline
func systemstack(func()) {}
//go:nowritebarrierrec
func e1() {
systemstack(e2)
systemstack(func() {
x.f = y // ERROR "write barrier prohibited by caller"
})
}
func e2() {
x.f = y // ERROR "write barrier prohibited by caller"
}
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