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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
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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 sync/atomic.
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package escape
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import (
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"sync/atomic"
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"unsafe"
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)
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// BAD: should be "leaking param: addr to result ~r1 level=1$".
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func LoadPointer(addr *unsafe.Pointer) unsafe.Pointer { // ERROR "leaking param: addr$"
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return atomic.LoadPointer(addr)
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}
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var ptr unsafe.Pointer
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func StorePointer() {
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var x int // ERROR "moved to heap: x"
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atomic.StorePointer(&ptr, unsafe.Pointer(&x))
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}
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func SwapPointer() {
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var x int // ERROR "moved to heap: x"
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atomic.SwapPointer(&ptr, unsafe.Pointer(&x))
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}
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func CompareAndSwapPointer() {
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// BAD: x doesn't need to be heap allocated
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var x int // ERROR "moved to heap: x"
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var y int // ERROR "moved to heap: y"
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atomic.CompareAndSwapPointer(&ptr, unsafe.Pointer(&x), unsafe.Pointer(&y))
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}
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