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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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130 #if defined(COMPILER_MSVC) | 130 #if defined(COMPILER_MSVC) |
131 #define ALIGNOF(type) (sizeof(type) - sizeof(type) + __alignof(type)) | 131 #define ALIGNOF(type) (sizeof(type) - sizeof(type) + __alignof(type)) |
132 #elif defined(COMPILER_GCC) | 132 #elif defined(COMPILER_GCC) |
133 #define ALIGNOF(type) __alignof__(type) | 133 #define ALIGNOF(type) __alignof__(type) |
134 #endif | 134 #endif |
135 | 135 |
136 // Annotate a virtual method indicating it must be overriding a virtual | 136 // Annotate a virtual method indicating it must be overriding a virtual |
137 // method in the parent class. | 137 // method in the parent class. |
138 // Use like: | 138 // Use like: |
139 // virtual void foo() OVERRIDE; | 139 // virtual void foo() OVERRIDE; |
140 #if defined(__clang__) || defined(COMPILER_MSVC) | |
141 #define OVERRIDE override | 140 #define OVERRIDE override |
142 #elif defined(COMPILER_GCC) && __cplusplus >= 201103 && \ | |
143 (__GNUC__ * 10000 + __GNUC_MINOR__ * 100) >= 40700 | |
144 // GCC 4.7 supports explicit virtual overrides when C++11 support is enabled. | |
145 #define OVERRIDE override | |
146 #else | |
147 #define OVERRIDE | |
148 #endif | |
149 | 141 |
150 // Annotate a virtual method indicating that subclasses must not override it, | 142 // Annotate a virtual method indicating that subclasses must not override it, |
151 // or annotate a class to indicate that it cannot be subclassed. | 143 // or annotate a class to indicate that it cannot be subclassed. |
152 // Use like: | 144 // Use like: |
153 // virtual void foo() FINAL; | 145 // virtual void foo() FINAL; |
154 // class B FINAL : public A {}; | 146 // class B FINAL : public A {}; |
155 #if defined(__clang__) || defined(COMPILER_MSVC) | |
156 #define FINAL final | 147 #define FINAL final |
157 #elif defined(COMPILER_GCC) && __cplusplus >= 201103 && \ | |
158 (__GNUC__ * 10000 + __GNUC_MINOR__ * 100) >= 40700 | |
159 // GCC 4.7 supports explicit virtual overrides when C++11 support is enabled. | |
160 #define FINAL final | |
161 #else | |
162 #define FINAL | |
163 #endif | |
164 | 148 |
165 // Annotate a function indicating the caller must examine the return value. | 149 // Annotate a function indicating the caller must examine the return value. |
166 // Use like: | 150 // Use like: |
167 // int foo() WARN_UNUSED_RESULT; | 151 // int foo() WARN_UNUSED_RESULT; |
168 // To explicitly ignore a result, see |ignore_result()| in <base/basictypes.h>. | 152 // To explicitly ignore a result, see |ignore_result()| in <base/basictypes.h>. |
169 #if defined(COMPILER_GCC) | 153 #if defined(COMPILER_GCC) |
170 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) | 154 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) |
171 #else | 155 #else |
172 #define WARN_UNUSED_RESULT | 156 #define WARN_UNUSED_RESULT |
173 #endif | 157 #endif |
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215 // Macro for hinting that an expression is likely to be false. | 199 // Macro for hinting that an expression is likely to be false. |
216 #if !defined(UNLIKELY) | 200 #if !defined(UNLIKELY) |
217 #if defined(COMPILER_GCC) | 201 #if defined(COMPILER_GCC) |
218 #define UNLIKELY(x) __builtin_expect(!!(x), 0) | 202 #define UNLIKELY(x) __builtin_expect(!!(x), 0) |
219 #else | 203 #else |
220 #define UNLIKELY(x) (x) | 204 #define UNLIKELY(x) (x) |
221 #endif // defined(COMPILER_GCC) | 205 #endif // defined(COMPILER_GCC) |
222 #endif // !defined(UNLIKELY) | 206 #endif // !defined(UNLIKELY) |
223 | 207 |
224 #endif // BASE_COMPILER_SPECIFIC_H_ | 208 #endif // BASE_COMPILER_SPECIFIC_H_ |
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