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https://github.com/flutter/flutter.git
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90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
/*
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* Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SKY_ENGINE_WTF_ALIGNMENT_H_
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#define SKY_ENGINE_WTF_ALIGNMENT_H_
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#include <stdint.h>
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#include <algorithm>
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#include <cstddef>
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#include "flutter/sky/engine/wtf/Compiler.h"
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namespace WTF {
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#if COMPILER(GCC)
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#define WTF_ALIGN_OF(type) __alignof__(type)
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#define WTF_ALIGNED(variable_type, variable, n) \
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variable_type variable __attribute__((__aligned__(n)))
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#else
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#error WTF_ALIGN macros need alignment control.
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#endif
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#if COMPILER(GCC)
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typedef char __attribute__((__may_alias__)) AlignedBufferChar;
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#else
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typedef char AlignedBufferChar;
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#endif
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template <size_t size, size_t alignment>
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struct AlignedBuffer;
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template <size_t size>
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struct AlignedBuffer<size, 1> {
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AlignedBufferChar buffer[size];
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};
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template <size_t size>
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struct AlignedBuffer<size, 2> {
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WTF_ALIGNED(AlignedBufferChar, buffer[size], 2);
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};
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template <size_t size>
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struct AlignedBuffer<size, 4> {
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WTF_ALIGNED(AlignedBufferChar, buffer[size], 4);
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};
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template <size_t size>
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struct AlignedBuffer<size, 8> {
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WTF_ALIGNED(AlignedBufferChar, buffer[size], 8);
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};
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template <size_t size>
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struct AlignedBuffer<size, 16> {
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WTF_ALIGNED(AlignedBufferChar, buffer[size], 16);
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};
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template <size_t size>
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struct AlignedBuffer<size, 32> {
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WTF_ALIGNED(AlignedBufferChar, buffer[size], 32);
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};
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template <size_t size>
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struct AlignedBuffer<size, 64> {
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WTF_ALIGNED(AlignedBufferChar, buffer[size], 64);
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};
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template <size_t size, size_t alignment>
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void swap(AlignedBuffer<size, alignment>& a,
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AlignedBuffer<size, alignment>& b) {
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for (size_t i = 0; i < size; ++i)
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std::swap(a.buffer[i], b.buffer[i]);
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}
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template <uintptr_t mask>
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inline bool isAlignedTo(const void* pointer) {
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return !(reinterpret_cast<uintptr_t>(pointer) & mask);
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}
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} // namespace WTF
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#endif // SKY_ENGINE_WTF_ALIGNMENT_H_
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