src/cmd/cgo/internal/test/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 func recurseHANDLE(n int, p C.HANDLE, v uintptr) {
  31         if n > 0 {
  32                 recurseHANDLE(n-1, p, v)
  33         }
  34         if uintptr(unsafe.Pointer(p)) != v {
  35                 panic("adjusted notinheap pointer")
  36         }
  37 }
  38
  39 func recurseHWND(n int, p C.HWND, v uintptr) {
  40         if n > 0 {
  41                 recurseHWND(n-1, p, v)
  42         }
  43         if uintptr(unsafe.Pointer(p)) != v {
  44                 panic("adjusted notinheap pointer")
  45         }
  46 }