mirror of
https://github.com/golang/go
synced 2024-11-18 03:54:50 -07:00
b5946ed48d
Casp1 is implemented in Go on js/wasm, so escape analysis correctly determines that the "old" parameter does not escape (which is good). Unfortunately, test/run.go doesn't have a way to indicate that ERROR messages are optional, and cmd/compile only emits diagnostics for "var x int" when it's moved to the heap; not when it stays on the stack. To accomodate that this test currently passes on some GOARCHes but not others, rewrite the Casp1 test to use "x := new(int)" and allow both "new(int) escapes to heap" or "new(int) does not escape". Updates #31525. Change-Id: I40150a7ff9042f184386ccdb2d4d428f63e8ba4f Reviewed-on: https://go-review.googlesource.com/c/go/+/172602 Run-TryBot: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
34 lines
874 B
Go
34 lines
874 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 runtime/internal/atomic.
|
|
|
|
package escape
|
|
|
|
import (
|
|
"runtime/internal/atomic"
|
|
"unsafe"
|
|
)
|
|
|
|
// BAD: should always be "leaking param: addr to result ~r1 level=1$".
|
|
func Loadp(addr unsafe.Pointer) unsafe.Pointer { // ERROR "leaking param: addr( to result ~r1 level=1)?$"
|
|
return atomic.Loadp(addr)
|
|
}
|
|
|
|
var ptr unsafe.Pointer
|
|
|
|
func Storep() {
|
|
var x int // ERROR "moved to heap: x"
|
|
atomic.StorepNoWB(unsafe.Pointer(&ptr), unsafe.Pointer(&x))
|
|
}
|
|
|
|
func Casp1() {
|
|
// BAD: should always be "does not escape"
|
|
x := new(int) // ERROR "escapes to heap|does not escape"
|
|
var y int // ERROR "moved to heap: y"
|
|
atomic.Casp1(&ptr, unsafe.Pointer(x), unsafe.Pointer(&y))
|
|
}
|