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/*
* Copyright (c) 2012 The WebRTC 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.
*/
#include "rtc_base/memory/aligned_malloc.h"
#include <memory>
#ifdef _WIN32
#include <windows.h>
#else
#include <stdint.h>
#endif
#include "test/gtest.h"
namespace webrtc {
// Returns true if `size` and `alignment` are valid combinations.
bool CorrectUsage(size_t size, size_t alignment) {
std::unique_ptr<char, AlignedFreeDeleter> scoped(
static_cast<char*>(AlignedMalloc(size, alignment)));
if (scoped.get() == nullptr) {
return false;
}
const uintptr_t scoped_address = reinterpret_cast<uintptr_t>(scoped.get());
return 0u == scoped_address % alignment;
}
TEST(AlignedMalloc, GetRightAlign) {
const size_t size = 100;
const size_t alignment = 32;
const size_t left_misalignment = 1;
std::unique_ptr<char, AlignedFreeDeleter> scoped(
static_cast<char*>(AlignedMalloc(size, alignment)));
EXPECT_TRUE(scoped.get() != nullptr);
const uintptr_t aligned_address = reinterpret_cast<uintptr_t>(scoped.get());
const uintptr_t misaligned_address = aligned_address - left_misalignment;
const char* misaligned_ptr =
reinterpret_cast<const char*>(misaligned_address);
const char* realigned_ptr = GetRightAlign(misaligned_ptr, alignment);
EXPECT_EQ(scoped.get(), realigned_ptr);
}
TEST(AlignedMalloc, IncorrectSize) {
const size_t incorrect_size = 0;
const size_t alignment = 64;
EXPECT_FALSE(CorrectUsage(incorrect_size, alignment));
}
TEST(AlignedMalloc, IncorrectAlignment) {
const size_t size = 100;
const size_t incorrect_alignment = 63;
EXPECT_FALSE(CorrectUsage(size, incorrect_alignment));
}
TEST(AlignedMalloc, AlignTo2Bytes) {
size_t size = 100;
size_t alignment = 2;
EXPECT_TRUE(CorrectUsage(size, alignment));
}
TEST(AlignedMalloc, AlignTo32Bytes) {
size_t size = 100;
size_t alignment = 32;
EXPECT_TRUE(CorrectUsage(size, alignment));
}
TEST(AlignedMalloc, AlignTo128Bytes) {
size_t size = 100;
size_t alignment = 128;
EXPECT_TRUE(CorrectUsage(size, alignment));
}
} // namespace webrtc
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