2 * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
21 #ifndef WTF_Alignment_h
22 #define WTF_Alignment_h
24 #include <wtf/Platform.h>
29 #if COMPILER(GCC) || COMPILER(MINGW) || COMPILER(RVCT) || COMPILER(GCCE) || (COMPILER(SUNCC) && __SUNPRO_CC > 0x590)
30 #define WTF_ALIGN_OF(type) __alignof__(type)
31 #define WTF_ALIGNED(variable_type, variable, n) variable_type variable __attribute__((__aligned__(n)))
33 #define WTF_ALIGN_OF(type) __alignof(type)
34 #define WTF_ALIGNED(variable_type, variable, n) __declspec(align(n)) variable_type variable
36 #error WTF_ALIGN macros need alignment control.
39 #if COMPILER(GCC) && !COMPILER(INTEL) && (((__GNUC__ * 100) + __GNUC_MINOR__) >= 303)
40 typedef char __attribute__((__may_alias__)) AlignedBufferChar;
42 typedef char AlignedBufferChar;
45 template<size_t size, size_t alignment> struct AlignedBuffer;
46 template<size_t size> struct AlignedBuffer<size, 1> { AlignedBufferChar buffer[size]; };
47 template<size_t size> struct AlignedBuffer<size, 2> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 2); };
48 template<size_t size> struct AlignedBuffer<size, 4> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 4); };
49 template<size_t size> struct AlignedBuffer<size, 8> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 8); };
50 template<size_t size> struct AlignedBuffer<size, 16> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 16); };
51 template<size_t size> struct AlignedBuffer<size, 32> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 32); };
52 template<size_t size> struct AlignedBuffer<size, 64> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 64); };
54 template <size_t size, size_t alignment>
55 void swap(AlignedBuffer<size, alignment>& a, AlignedBuffer<size, alignment>& b)
57 for (size_t i = 0; i < size; ++i)
58 std::swap(a.buffer[i], b.buffer[i]);
63 #endif // WTF_Alignment_h