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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
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// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test escape analysis for runtime/internal/atomic.
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package escape
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import (
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"runtime/internal/atomic"
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"unsafe"
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)
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// BAD: should always be "leaking param: addr to result ~r1 level=1$".
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func Loadp(addr unsafe.Pointer) unsafe.Pointer { // ERROR "leaking param: addr( to result ~r1 level=1)?$"
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return atomic.Loadp(addr)
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}
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var ptr unsafe.Pointer
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func Storep() {
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var x int // ERROR "moved to heap: x"
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atomic.StorepNoWB(unsafe.Pointer(&ptr), unsafe.Pointer(&x))
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}
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func Casp1() {
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// BAD: should always be "does not escape"
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x := new(int) // ERROR "escapes to heap|does not escape"
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var y int // ERROR "moved to heap: y"
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atomic.Casp1(&ptr, unsafe.Pointer(x), unsafe.Pointer(&y))
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}
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