go escape_sync_atomic 源码
golang escape_sync_atomic 代码
文件路径：/test/escape_sync_atomic.go
// errorcheck -0 -m -l
// 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.
// Test escape analysis for sync/atomic.
package escape
import (
"sync/atomic"
"unsafe"
)
// BAD: should be "leaking param: addr to result ~r1 level=1$".
func LoadPointer(addr *unsafe.Pointer) unsafe.Pointer { // ERROR "leaking param: addr$"
return atomic.LoadPointer(addr)
}
var ptr unsafe.Pointer
func StorePointer() {
var x int // ERROR "moved to heap: x"
atomic.StorePointer(&ptr, unsafe.Pointer(&x))
}
func SwapPointer() {
var x int // ERROR "moved to heap: x"
atomic.SwapPointer(&ptr, unsafe.Pointer(&x))
}
func CompareAndSwapPointer() {
// BAD: x doesn't need to be heap allocated
var x int // ERROR "moved to heap: x"
var y int // ERROR "moved to heap: y"
atomic.CompareAndSwapPointer(&ptr, unsafe.Pointer(&x), unsafe.Pointer(&y))
}
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