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// 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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