1 files changed, 46 insertions, 0 deletions
diff --git a/misc/cgo/test/issue42018_windows.go b/misc/cgo/test/issue42018_windows.go
new file mode 100644
index 0000000..8f4570a
--- /dev/null
+++ b/misc/cgo/test/issue42018_windows.go
@@ -0,0 +1,46 @@
+// 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")
+	}
+}