go issue42018_windows 源码
golang issue42018_windows 代码
文件路径：/misc/cgo/test/issue42018_windows.go
// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cgotest
/*
typedef void *HANDLE;
struct HWND__{int unused;}; typedef struct HWND__ *HWND;
*/
import "C"
import (
"testing"
"unsafe"
)
func test42018(t *testing.T) {
// Test that Windows handles are marked go:notinheap, by growing the
// stack and checking for pointer adjustments. Trick from
// test/fixedbugs/issue40954.go.
var i int
handle := C.HANDLE(unsafe.Pointer(uintptr(unsafe.Pointer(&i))))
recurseHANDLE(100, handle, uintptr(unsafe.Pointer(&i)))
hwnd := C.HWND(unsafe.Pointer(uintptr(unsafe.Pointer(&i))))
recurseHWND(400, hwnd, uintptr(unsafe.Pointer(&i)))
}
func recurseHANDLE(n int, p C.HANDLE, v uintptr) {
if n > 0 {
recurseHANDLE(n-1, p, v)
}
if uintptr(unsafe.Pointer(p)) != v {
panic("adjusted notinheap pointer")
}
}
func recurseHWND(n int, p C.HWND, v uintptr) {
if n > 0 {
recurseHWND(n-1, p, v)
}
if uintptr(unsafe.Pointer(p)) != v {
panic("adjusted notinheap pointer")
}
}
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