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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_COMPILER_SPECIFIC_H_ | 5 #ifndef BASE_COMPILER_SPECIFIC_H_ |
6 #define BASE_COMPILER_SPECIFIC_H_ | 6 #define BASE_COMPILER_SPECIFIC_H_ |
7 | 7 |
8 #include "build/build_config.h" | 8 #include "build/build_config.h" |
9 | 9 |
10 #if defined(COMPILER_MSVC) | 10 #if defined(COMPILER_MSVC) |
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106 // ALIGNAS(16) int array[4]; | 106 // ALIGNAS(16) int array[4]; |
107 #if defined(COMPILER_MSVC) | 107 #if defined(COMPILER_MSVC) |
108 #define ALIGNAS(byte_alignment) __declspec(align(byte_alignment)) | 108 #define ALIGNAS(byte_alignment) __declspec(align(byte_alignment)) |
109 #elif defined(COMPILER_GCC) | 109 #elif defined(COMPILER_GCC) |
110 #define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment))) | 110 #define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment))) |
111 #endif | 111 #endif |
112 | 112 |
113 // Return the byte alignment of the given type (available at compile time). | 113 // Return the byte alignment of the given type (available at compile time). |
114 // Use like: | 114 // Use like: |
115 // ALIGNOF(int32) // this would be 4 | 115 // ALIGNOF(int32) // this would be 4 |
116 #if defined(COMPILER_MSVC) | 116 #define ALIGNOF(type) alignof(type) |
117 #define ALIGNOF(type) __alignof(type) | |
118 #elif defined(COMPILER_GCC) | |
119 #define ALIGNOF(type) __alignof__(type) | |
120 #endif | |
121 | 117 |
122 // Annotate a function indicating the caller must examine the return value. | 118 // Annotate a function indicating the caller must examine the return value. |
123 // Use like: | 119 // Use like: |
124 // int foo() WARN_UNUSED_RESULT; | 120 // int foo() WARN_UNUSED_RESULT; |
125 // To explicitly ignore a result, see |ignore_result()| in base/macros.h. | 121 // To explicitly ignore a result, see |ignore_result()| in base/macros.h. |
126 // TODO(dcheng): Update //third_party/webrtc's macro definition to match. | 122 // TODO(dcheng): Update //third_party/webrtc's macro definition to match. |
127 #undef WARN_UNUSED_RESULT | 123 #undef WARN_UNUSED_RESULT |
128 #if defined(COMPILER_GCC) || defined(__clang__) | 124 #if defined(COMPILER_GCC) || defined(__clang__) |
129 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) | 125 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) |
130 #else | 126 #else |
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182 // Macro for hinting that an expression is likely to be false. | 178 // Macro for hinting that an expression is likely to be false. |
183 #if !defined(UNLIKELY) | 179 #if !defined(UNLIKELY) |
184 #if defined(COMPILER_GCC) | 180 #if defined(COMPILER_GCC) |
185 #define UNLIKELY(x) __builtin_expect(!!(x), 0) | 181 #define UNLIKELY(x) __builtin_expect(!!(x), 0) |
186 #else | 182 #else |
187 #define UNLIKELY(x) (x) | 183 #define UNLIKELY(x) (x) |
188 #endif // defined(COMPILER_GCC) | 184 #endif // defined(COMPILER_GCC) |
189 #endif // !defined(UNLIKELY) | 185 #endif // !defined(UNLIKELY) |
190 | 186 |
191 #endif // BASE_COMPILER_SPECIFIC_H_ | 187 #endif // BASE_COMPILER_SPECIFIC_H_ |
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