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1 /* | 1 /* |
2 * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. | 2 * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. |
3 * | 3 * |
4 * This library is free software; you can redistribute it and/or | 4 * This library is free software; you can redistribute it and/or |
5 * modify it under the terms of the GNU Library General Public | 5 * modify it under the terms of the GNU Library General Public |
6 * License as published by the Free Software Foundation; either | 6 * License as published by the Free Software Foundation; either |
7 * version 2 of the License, or (at your option) any later version. | 7 * version 2 of the License, or (at your option) any later version. |
8 * | 8 * |
9 * This library is distributed in the hope that it will be useful, | 9 * This library is distributed in the hope that it will be useful, |
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of | 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
(...skipping 10 matching lines...) Expand all Loading... |
21 #ifndef WTF_Alignment_h | 21 #ifndef WTF_Alignment_h |
22 #define WTF_Alignment_h | 22 #define WTF_Alignment_h |
23 | 23 |
24 #include <wtf/Platform.h> | 24 #include <wtf/Platform.h> |
25 #include <algorithm> | 25 #include <algorithm> |
26 #include <stdint.h> | 26 #include <stdint.h> |
27 | 27 |
28 | 28 |
29 namespace WTF { | 29 namespace WTF { |
30 | 30 |
31 #if COMPILER(GCC) || COMPILER(MINGW) || COMPILER(GCCE) | 31 #if COMPILER(GCC) || COMPILER(MINGW) |
32 #define WTF_ALIGN_OF(type) __alignof__(type) | 32 #define WTF_ALIGN_OF(type) __alignof__(type) |
33 #define WTF_ALIGNED(variable_type, variable, n) variable_type variable __att
ribute__((__aligned__(n))) | 33 #define WTF_ALIGNED(variable_type, variable, n) variable_type variable __att
ribute__((__aligned__(n))) |
34 #elif COMPILER(MSVC) | 34 #elif COMPILER(MSVC) |
35 #define WTF_ALIGN_OF(type) __alignof(type) | 35 #define WTF_ALIGN_OF(type) __alignof(type) |
36 #define WTF_ALIGNED(variable_type, variable, n) __declspec(align(n)) variabl
e_type variable | 36 #define WTF_ALIGNED(variable_type, variable, n) __declspec(align(n)) variabl
e_type variable |
37 #else | 37 #else |
38 #error WTF_ALIGN macros need alignment control. | 38 #error WTF_ALIGN macros need alignment control. |
39 #endif | 39 #endif |
40 | 40 |
41 #if COMPILER(GCC) && !COMPILER(INTEL) && (((__GNUC__ * 100) + __GNUC_MINOR__) >=
303) | 41 #if COMPILER(GCC) |
42 typedef char __attribute__((__may_alias__)) AlignedBufferChar; | 42 typedef char __attribute__((__may_alias__)) AlignedBufferChar; |
43 #else | 43 #else |
44 typedef char AlignedBufferChar; | 44 typedef char AlignedBufferChar; |
45 #endif | 45 #endif |
46 | 46 |
47 template<size_t size, size_t alignment> struct AlignedBuffer; | 47 template<size_t size, size_t alignment> struct AlignedBuffer; |
48 template<size_t size> struct AlignedBuffer<size, 1> { AlignedBufferChar buff
er[size]; }; | 48 template<size_t size> struct AlignedBuffer<size, 1> { AlignedBufferChar buff
er[size]; }; |
49 template<size_t size> struct AlignedBuffer<size, 2> { WTF_ALIGNED(AlignedBuf
ferChar, buffer[size], 2); }; | 49 template<size_t size> struct AlignedBuffer<size, 2> { WTF_ALIGNED(AlignedBuf
ferChar, buffer[size], 2); }; |
50 template<size_t size> struct AlignedBuffer<size, 4> { WTF_ALIGNED(AlignedBuf
ferChar, buffer[size], 4); }; | 50 template<size_t size> struct AlignedBuffer<size, 4> { WTF_ALIGNED(AlignedBuf
ferChar, buffer[size], 4); }; |
51 template<size_t size> struct AlignedBuffer<size, 8> { WTF_ALIGNED(AlignedBuf
ferChar, buffer[size], 8); }; | 51 template<size_t size> struct AlignedBuffer<size, 8> { WTF_ALIGNED(AlignedBuf
ferChar, buffer[size], 8); }; |
52 template<size_t size> struct AlignedBuffer<size, 16> { WTF_ALIGNED(AlignedBu
fferChar, buffer[size], 16); }; | 52 template<size_t size> struct AlignedBuffer<size, 16> { WTF_ALIGNED(AlignedBu
fferChar, buffer[size], 16); }; |
53 template<size_t size> struct AlignedBuffer<size, 32> { WTF_ALIGNED(AlignedBu
fferChar, buffer[size], 32); }; | 53 template<size_t size> struct AlignedBuffer<size, 32> { WTF_ALIGNED(AlignedBu
fferChar, buffer[size], 32); }; |
54 template<size_t size> struct AlignedBuffer<size, 64> { WTF_ALIGNED(AlignedBu
fferChar, buffer[size], 64); }; | 54 template<size_t size> struct AlignedBuffer<size, 64> { WTF_ALIGNED(AlignedBu
fferChar, buffer[size], 64); }; |
55 | 55 |
56 template <size_t size, size_t alignment> | 56 template <size_t size, size_t alignment> |
57 void swap(AlignedBuffer<size, alignment>& a, AlignedBuffer<size, alignment>&
b) | 57 void swap(AlignedBuffer<size, alignment>& a, AlignedBuffer<size, alignment>&
b) |
58 { | 58 { |
59 for (size_t i = 0; i < size; ++i) | 59 for (size_t i = 0; i < size; ++i) |
60 std::swap(a.buffer[i], b.buffer[i]); | 60 std::swap(a.buffer[i], b.buffer[i]); |
61 } | 61 } |
62 | 62 |
63 template <uintptr_t mask> | 63 template <uintptr_t mask> |
64 inline bool isAlignedTo(const void* pointer) | 64 inline bool isAlignedTo(const void* pointer) |
65 { | 65 { |
66 return !(reinterpret_cast<uintptr_t>(pointer) & mask); | 66 return !(reinterpret_cast<uintptr_t>(pointer) & mask); |
67 } | 67 } |
68 } | 68 } |
69 | 69 |
70 #endif // WTF_Alignment_h | 70 #endif // WTF_Alignment_h |
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