mirror of
https://github.com/golang/go
synced 2024-11-15 00:00:34 -07:00
bbe5da4260
This new comment can be used to declare that the uintptr arguments to a function may be converted from pointers, and that those pointers should be considered to escape. This is used for the Call methods in dll_windows.go that take uintptr arguments, because they call Syscall. We can't treat these functions as we do syscall.Syscall, because unlike Syscall they may cause the stack to grow. For Syscall we can assume that stack arguments can remain on the stack, but for these functions we need them to escape. Fixes #16035. Change-Id: Ia0e5b4068c04f8d303d95ab9ea394939f1f57454 Reviewed-on: https://go-review.googlesource.com/24551 Reviewed-by: David Chase <drchase@google.com> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
92 lines
1.3 KiB
Go
92 lines
1.3 KiB
Go
// Copyright 2016 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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package main
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import (
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"fmt"
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"os"
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"sync"
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"unsafe"
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"./a"
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)
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func F1() int {
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var buf [1024]int
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a.F1(uintptr(unsafe.Pointer(&buf[0])))
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return buf[0]
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}
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func F2() int {
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var buf [1024]int
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a.F2(uintptr(unsafe.Pointer(&buf[0])))
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return buf[0]
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}
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var t = a.GetT()
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func M1() int {
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var buf [1024]int
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t.M1(uintptr(unsafe.Pointer(&buf[0])))
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return buf[0]
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}
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func M2() int {
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var buf [1024]int
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t.M2(uintptr(unsafe.Pointer(&buf[0])))
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return buf[0]
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}
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func main() {
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// Use different goroutines to force stack growth.
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var wg sync.WaitGroup
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wg.Add(4)
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c := make(chan bool, 4)
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go func() {
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defer wg.Done()
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b := F1()
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if b != 42 {
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fmt.Printf("F1: got %d, expected 42\n", b)
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c <- false
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}
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}()
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go func() {
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defer wg.Done()
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b := F2()
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if b != 42 {
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fmt.Printf("F2: got %d, expected 42\n", b)
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c <- false
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}
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}()
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go func() {
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defer wg.Done()
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b := M1()
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if b != 42 {
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fmt.Printf("M1: got %d, expected 42\n", b)
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c <- false
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}
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}()
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go func() {
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defer wg.Done()
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b := M2()
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if b != 42 {
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fmt.Printf("M2: got %d, expected 42\n", b)
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c <- false
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}
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}()
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wg.Wait()
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select {
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case <-c:
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os.Exit(1)
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default:
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}
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}
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