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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/message_loop/message_loop.h"
#include "base/win/wrapped_window_proc.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
DWORD kExceptionCode = 12345;
WPARAM kCrashMsg = 98765;
// A trivial WindowProc that generates an exception.
LRESULT CALLBACK TestWindowProc(HWND hwnd, UINT message,
WPARAM wparam, LPARAM lparam) {
if (message == kCrashMsg)
RaiseException(kExceptionCode, 0, 0, NULL);
return DefWindowProc(hwnd, message, wparam, lparam);
}
// This class implements an exception filter that can be queried about a past
// exception.
class TestWrappedExceptionFiter {
public:
TestWrappedExceptionFiter() : called_(false) {
EXPECT_FALSE(s_filter_);
s_filter_ = this;
}
~TestWrappedExceptionFiter() {
EXPECT_EQ(s_filter_, this);
s_filter_ = NULL;
}
bool called() {
return called_;
}
// The actual exception filter just records the exception.
static int Filter(EXCEPTION_POINTERS* info) {
EXPECT_FALSE(s_filter_->called_);
if (info->ExceptionRecord->ExceptionCode == kExceptionCode)
s_filter_->called_ = true;
return EXCEPTION_EXECUTE_HANDLER;
}
private:
bool called_;
static TestWrappedExceptionFiter* s_filter_;
};
TestWrappedExceptionFiter* TestWrappedExceptionFiter::s_filter_ = NULL;
} // namespace.
TEST(WrappedWindowProc, CatchesExceptions) {
HINSTANCE hinst = GetModuleHandle(NULL);
std::wstring class_name(L"TestClass");
WNDCLASS wc = {0};
wc.lpfnWndProc = base::win::WrappedWindowProc<TestWindowProc>;
wc.hInstance = hinst;
wc.lpszClassName = class_name.c_str();
RegisterClass(&wc);
HWND window = CreateWindow(class_name.c_str(), 0, 0, 0, 0, 0, 0, HWND_MESSAGE,
0, hinst, 0);
ASSERT_TRUE(window);
// Before generating the exception we make sure that the filter will see it.
TestWrappedExceptionFiter wrapper;
base::win::WinProcExceptionFilter old_filter =
base::win::SetWinProcExceptionFilter(TestWrappedExceptionFiter::Filter);
SendMessage(window, kCrashMsg, 0, 0);
EXPECT_TRUE(wrapper.called());
base::win::SetWinProcExceptionFilter(old_filter);
}
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