mirror of
https://github.com/golang/go
synced 2024-11-24 02:10:11 -07:00
9dce58d30d
The //go:noescape directive says that arguments don't leak at all, which is too aggressive of a claim for functions that return pointers derived from their parameters. Remove the directive for now. Long term fix will require a new directive that allows more fine-grained control over escape analysis information supplied for functions implemented in assembly. Also, update the BAD comments in the test cases for Loadp: we really want that *ptr leaks to the result parameter, not that *ptr leaks to the heap. Updates #31525. Change-Id: Ibfa61f2b70daa7ed3223056b57eeee777eef2e31 Reviewed-on: https://go-review.googlesource.com/c/go/+/172578 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>
39 lines
943 B
Go
39 lines
943 B
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))
|
|
}
|