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https://github.com/golang/go
synced 2024-11-15 01:30:31 -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>
55 lines
879 B
Go
55 lines
879 B
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 a
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import (
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"unsafe"
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)
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func recurse(i int, s []byte) byte {
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s[0] = byte(i)
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if i == 0 {
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return s[i]
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} else {
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var a [1024]byte
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r := recurse(i-1, a[:])
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return r + a[0]
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}
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}
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//go:uintptrescapes
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func F1(a uintptr) {
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var s [16]byte
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recurse(4096, s[:])
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*(*int)(unsafe.Pointer(a)) = 42
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}
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//go:uintptrescapes
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func F2(a ...uintptr) {
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var s [16]byte
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recurse(4096, s[:])
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*(*int)(unsafe.Pointer(a[0])) = 42
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}
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type t struct{}
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func GetT() *t {
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return &t{}
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}
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//go:uintptrescapes
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func (*t) M1(a uintptr) {
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var s [16]byte
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recurse(4096, s[:])
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*(*int)(unsafe.Pointer(a)) = 42
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}
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//go:uintptrescapes
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func (*t) M2(a ...uintptr) {
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var s [16]byte
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recurse(4096, s[:])
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*(*int)(unsafe.Pointer(a[0])) = 42
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}
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