ref: 3748adf870b95a0a8f4dc342fe12db5479c92da9
dir: /test/register_state_check.h/
/*
* Copyright (c) 2012 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef TEST_REGISTER_STATE_CHECK_H_
#define TEST_REGISTER_STATE_CHECK_H_
#ifdef _WIN64
#define _WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winnt.h>
#include "third_party/googletest/src/include/gtest/gtest.h"
namespace testing {
namespace internal {
inline bool operator==(const M128A& lhs, const M128A& rhs) {
return (lhs.Low == rhs.Low && lhs.High == rhs.High);
}
} // namespace internal
} // namespace testing
namespace libvpx_test {
// Compares the state of xmm[6-15] at construction with their state at
// destruction. These registers should be preserved by the callee on
// Windows x64.
// Usage:
// {
// RegisterStateCheck reg_check;
// FunctionToVerify();
// }
class RegisterStateCheck {
public:
RegisterStateCheck() { initialized_ = StoreRegisters(&pre_context_); }
~RegisterStateCheck() { EXPECT_TRUE(Check()); }
private:
static bool StoreRegisters(CONTEXT* const context) {
const HANDLE this_thread = GetCurrentThread();
EXPECT_TRUE(this_thread != NULL);
context->ContextFlags = CONTEXT_FLOATING_POINT;
const bool context_saved = GetThreadContext(this_thread, context) == TRUE;
EXPECT_TRUE(context_saved) << "GetLastError: " << GetLastError();
return context_saved;
}
// Compares the register state. Returns true if the states match.
bool Check() const {
if (!initialized_) return false;
CONTEXT post_context;
if (!StoreRegisters(&post_context)) return false;
const M128A* xmm_pre = &pre_context_.Xmm6;
const M128A* xmm_post = &post_context.Xmm6;
for (int i = 6; i <= 15; ++i) {
EXPECT_EQ(*xmm_pre, *xmm_post) << "xmm" << i << " has been modified!";
++xmm_pre;
++xmm_post;
}
return !testing::Test::HasNonfatalFailure();
}
bool initialized_;
CONTEXT pre_context_;
};
#define REGISTER_STATE_CHECK(statement) do { \
libvpx_test::RegisterStateCheck reg_check; \
statement; \
} while (false)
} // namespace libvpx_test
#else // !_WIN64
namespace libvpx_test {
class RegisterStateCheck {};
#define REGISTER_STATE_CHECK(statement) statement
} // namespace libvpx_test
#endif // _WIN64
#endif // TEST_REGISTER_STATE_CHECK_H_