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https://github.com/golang/go
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1f45216694
So we can insert theses OVARLIVE nodes right after OpStaticCall in SSA. This helps fixing issue that unsafe-uintptr arguments are not kept alive during return statement, or can be kept alive longer than expected. Fixes #24491 Change-Id: Ic04a5d1bbb5c90dcfae65bd95cdd1da393a66800 Reviewed-on: https://go-review.googlesource.com/c/go/+/254397 Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
47 lines
797 B
Go
47 lines
797 B
Go
// run
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// Copyright 2020 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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// This test makes sure unsafe-uintptr arguments are not
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// kept alive longer than expected.
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package main
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import (
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"runtime"
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"sync/atomic"
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"unsafe"
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)
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var done uint32
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func setup() unsafe.Pointer {
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s := "ok"
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runtime.SetFinalizer(&s, func(p *string) { atomic.StoreUint32(&done, 1) })
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return unsafe.Pointer(&s)
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}
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//go:noinline
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//go:uintptrescapes
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func before(p uintptr) int {
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runtime.GC()
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if atomic.LoadUint32(&done) != 0 {
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panic("GC early")
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}
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return 0
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}
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func after() int {
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runtime.GC()
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if atomic.LoadUint32(&done) == 0 {
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panic("GC late")
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}
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return 0
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}
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func main() {
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_ = before(uintptr(setup())) + after()
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}
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