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153 lines
4.3 KiB
153 lines
4.3 KiB
// Copyright 2018 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "android/base/Compiler.h"
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#include <algorithm>
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#include <atomic>
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#include <cinttypes>
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#include <cstdlib>
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#include <cstring>
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#include <type_traits>
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#include <vector>
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#include <stdio.h>
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#ifdef _WIN32
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#include <malloc.h>
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#endif
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namespace android {
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template <class T, size_t align>
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class AlignedBuf {
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public:
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explicit AlignedBuf(size_t size) {
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static_assert(align && ((align & (align - 1)) == 0),
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"AlignedBuf only supports power-of-2 aligments.");
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resizeImpl(size);
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}
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AlignedBuf(const AlignedBuf& other) : AlignedBuf(other.mSize) {
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if (other.mBuffer) { // could have got moved out
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std::copy(other.mBuffer, other.mBuffer + other.mSize, mBuffer);
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}
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}
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AlignedBuf& operator=(const AlignedBuf& other) {
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if (this != &other) {
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AlignedBuf tmp(other);
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*this = std::move(tmp);
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}
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return *this;
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}
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AlignedBuf(AlignedBuf&& other) { *this = std::move(other); }
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AlignedBuf& operator=(AlignedBuf&& other) {
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mBuffer = other.mBuffer;
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mSize = other.mSize;
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other.mBuffer = nullptr;
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other.mSize = 0;
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return *this;
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}
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~AlignedBuf() { if (mBuffer) freeImpl(mBuffer); } // account for getting moved out
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void resize(size_t newSize) {
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#if (defined(__GNUC__) && !defined(__clang__) && __GNUC__ <= 4) || \
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defined(__OLD_STD_VERSION__)
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// Older g++ doesn't support std::is_trivially_copyable.
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constexpr bool triviallyCopyable =
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std::has_trivial_copy_constructor<T>::value;
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#else
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constexpr bool triviallyCopyable = std::is_trivially_copyable<T>::value;
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#endif
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static_assert(triviallyCopyable,
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"AlignedBuf can only resize trivially copyable values");
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resizeImpl(newSize);
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}
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size_t size() const { return mSize; }
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T* data() { return mBuffer; }
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T& operator[](size_t index) { return mBuffer[index]; }
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const T& operator[](size_t index) const { return mBuffer[index]; }
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bool operator==(const AlignedBuf& other) const {
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return 0 == std::memcmp(mBuffer, other.mBuffer, sizeof(T) * std::min(mSize, other.mSize));
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}
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private:
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void resizeImpl(size_t newSize) {
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if (newSize) {
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size_t pad = std::max(align, sizeof(T));
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size_t keepSize = std::min(newSize, mSize);
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size_t newSizeBytes = ((align - 1 + newSize * sizeof(T) + pad) / align) * align;
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std::vector<T> temp(mBuffer, mBuffer + keepSize);
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mBuffer = static_cast<T*>(reallocImpl(mBuffer, newSizeBytes));
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std::copy(temp.data(), temp.data() + keepSize, mBuffer);
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} else {
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if (mBuffer) freeImpl(mBuffer);
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mBuffer = nullptr;
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}
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mSize = newSize;
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}
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void* reallocImpl(void* oldPtr, size_t sizeBytes) {
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if (oldPtr) { freeImpl(oldPtr); }
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// Platform aligned malloc might not behave right
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// if we give it an alignemnt value smaller than sizeof(void*).
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size_t actualAlign = std::max(align, sizeof(void*));
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#ifdef _WIN32
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return _aligned_malloc(sizeBytes, actualAlign);
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#else
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void* res;
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if (posix_memalign(&res, actualAlign, sizeBytes)) {
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fprintf(stderr, "%s: failed to alloc aligned memory\n", __func__);
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abort();
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}
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return res;
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#endif
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}
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void freeImpl(void* ptr) {
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#ifdef _WIN32
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_aligned_free(ptr);
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#else
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free(ptr);
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#endif
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}
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T* mBuffer = nullptr;
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size_t mSize = 0;
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};
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// Convenience function for aligned malloc across platforms
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void* aligned_buf_alloc(size_t align, size_t size);
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void aligned_buf_free(void* buf);
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} // namespace android
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