15c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* 25c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. 35c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 45c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * This library is free software; you can redistribute it and/or 55c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * modify it under the terms of the GNU Library General Public 65c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * License as published by the Free Software Foundation; either 75c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * version 2 of the License, or (at your option) any later version. 85c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 95c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * This library is distributed in the hope that it will be useful, 105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * but WITHOUT ANY WARRANTY; without even the implied warranty of 115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Library General Public License for more details. 135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * You should have received a copy of the GNU Library General Public License 155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * along with this library; see the file COPYING.LIB. If not, write to 165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Boston, MA 02110-1301, USA. 185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) */ 205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#ifndef WTF_Alignment_h 225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define WTF_Alignment_h 235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#include <algorithm> 255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#include <stdint.h> 265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)namespace WTF { 295c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 30521d96ec04ace82590870fb04353ec4f82bb150fTorne (Richard Coles)#if COMPILER(GCC) 315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) #define WTF_ALIGN_OF(type) __alignof__(type) 325c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) #define WTF_ALIGNED(variable_type, variable, n) variable_type variable __attribute__((__aligned__(n))) 335c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#elif COMPILER(MSVC) 345c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) #define WTF_ALIGN_OF(type) __alignof(type) 355c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) #define WTF_ALIGNED(variable_type, variable, n) __declspec(align(n)) variable_type variable 365c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#else 375c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) #error WTF_ALIGN macros need alignment control. 385c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#endif 395c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 4093ac45cfc74041c8ae536ce58a9534d46db2024eTorne (Richard Coles)#if COMPILER(GCC) 4102772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch typedef char __attribute__((__may_alias__)) AlignedBufferChar; 425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#else 4302772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch typedef char AlignedBufferChar; 445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#endif 455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template<size_t size, size_t alignment> struct AlignedBuffer; 475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template<size_t size> struct AlignedBuffer<size, 1> { AlignedBufferChar buffer[size]; }; 485c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template<size_t size> struct AlignedBuffer<size, 2> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 2); }; 495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template<size_t size> struct AlignedBuffer<size, 4> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 4); }; 505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template<size_t size> struct AlignedBuffer<size, 8> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 8); }; 515c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template<size_t size> struct AlignedBuffer<size, 16> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 16); }; 525c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template<size_t size> struct AlignedBuffer<size, 32> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 32); }; 535c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template<size_t size> struct AlignedBuffer<size, 64> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 64); }; 545c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 555c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template <size_t size, size_t alignment> 565c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) void swap(AlignedBuffer<size, alignment>& a, AlignedBuffer<size, alignment>& b) 575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 585c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) for (size_t i = 0; i < size; ++i) 595c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) std::swap(a.buffer[i], b.buffer[i]); 605c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) template <uintptr_t mask> 635c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) inline bool isAlignedTo(const void* pointer) 645c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) { 655c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return !(reinterpret_cast<uintptr_t>(pointer) & mask); 665c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 675c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 685c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 695c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#endif // WTF_Alignment_h 70