issue42018_windows.go

     1  // Copyright 2021 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package cgotest
     6  
     7  /*
     8  typedef void *HANDLE;
     9  
    10  struct HWND__{int unused;}; typedef struct HWND__ *HWND;
    11  */
    12  import "C"
    13  
    14  import (
    15  	"testing"
    16  	"unsafe"
    17  )
    18  
    19  func test42018(t *testing.T) {
    20  	// Test that Windows handles are marked go:notinheap, by growing the
    21  	// stack and checking for pointer adjustments. Trick from
    22  	// test/fixedbugs/issue40954.go.
    23  	var i int
    24  	handle := C.HANDLE(unsafe.Pointer(uintptr(unsafe.Pointer(&i))))
    25  	recurseHANDLE(100, handle, uintptr(unsafe.Pointer(&i)))
    26  	hwnd := C.HWND(unsafe.Pointer(uintptr(unsafe.Pointer(&i))))
    27  	recurseHWND(400, hwnd, uintptr(unsafe.Pointer(&i)))
    28  }
    29  
    30  //go:noinline
    31  func recurseHANDLE(n int, p C.HANDLE, v uintptr) {
    32  	if n > 0 {
    33  		recurseHANDLE(n-1, p, v)
    34  	}
    35  	if uintptr(unsafe.Pointer(p)) != v {
    36  		panic("adjusted notinheap pointer")
    37  	}
    38  }
    39  
    40  //go:noinline
    41  func recurseHWND(n int, p C.HWND, v uintptr) {
    42  	if n > 0 {
    43  		recurseHWND(n-1, p, v)
    44  	}
    45  	if uintptr(unsafe.Pointer(p)) != v {
    46  		panic("adjusted notinheap pointer")
    47  	}
    48  }
    49
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