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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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105 // class ALIGNAS(16) MyClass { ... } | 105 // class ALIGNAS(16) MyClass { ... } |
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_t) // this would be 4 |
116 #if defined(COMPILER_MSVC) | 116 #if defined(COMPILER_MSVC) |
117 #define ALIGNOF(type) __alignof(type) | 117 #define ALIGNOF(type) __alignof(type) |
118 #elif defined(COMPILER_GCC) | 118 #elif defined(COMPILER_GCC) |
119 #define ALIGNOF(type) __alignof__(type) | 119 #define ALIGNOF(type) __alignof__(type) |
120 #endif | 120 #endif |
121 | 121 |
122 // Annotate a function indicating the caller must examine the return value. | 122 // Annotate a function indicating the caller must examine the return value. |
123 // Use like: | 123 // Use like: |
124 // int foo() WARN_UNUSED_RESULT; | 124 // int foo() WARN_UNUSED_RESULT; |
125 // To explicitly ignore a result, see |ignore_result()| in base/macros.h. | 125 // To explicitly ignore a result, see |ignore_result()| in base/macros.h. |
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181 // Macro for hinting that an expression is likely to be false. | 181 // Macro for hinting that an expression is likely to be false. |
182 #if !defined(UNLIKELY) | 182 #if !defined(UNLIKELY) |
183 #if defined(COMPILER_GCC) | 183 #if defined(COMPILER_GCC) |
184 #define UNLIKELY(x) __builtin_expect(!!(x), 0) | 184 #define UNLIKELY(x) __builtin_expect(!!(x), 0) |
185 #else | 185 #else |
186 #define UNLIKELY(x) (x) | 186 #define UNLIKELY(x) (x) |
187 #endif // defined(COMPILER_GCC) | 187 #endif // defined(COMPILER_GCC) |
188 #endif // !defined(UNLIKELY) | 188 #endif // !defined(UNLIKELY) |
189 | 189 |
190 #endif // BASE_COMPILER_SPECIFIC_H_ | 190 #endif // BASE_COMPILER_SPECIFIC_H_ |
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