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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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94 // (Typically used to silence a compiler warning when the assignment | 94 // (Typically used to silence a compiler warning when the assignment |
95 // is important for some other reason.) | 95 // is important for some other reason.) |
96 // Use like: | 96 // Use like: |
97 // int x = ...; | 97 // int x = ...; |
98 // ALLOW_UNUSED_LOCAL(x); | 98 // ALLOW_UNUSED_LOCAL(x); |
99 #define ALLOW_UNUSED_LOCAL(x) false ? (void)x : (void)0 | 99 #define ALLOW_UNUSED_LOCAL(x) false ? (void)x : (void)0 |
100 | 100 |
101 // Annotate a typedef or function indicating it's ok if it's not used. | 101 // Annotate a typedef or function indicating it's ok if it's not used. |
102 // Use like: | 102 // Use like: |
103 // typedef Foo Bar ALLOW_UNUSED_TYPE; | 103 // typedef Foo Bar ALLOW_UNUSED_TYPE; |
104 #if defined(COMPILER_GCC) | 104 #if defined(COMPILER_GCC) || defined(__clang__) |
105 #define ALLOW_UNUSED_TYPE __attribute__((unused)) | 105 #define ALLOW_UNUSED_TYPE __attribute__((unused)) |
106 #else | 106 #else |
107 #define ALLOW_UNUSED_TYPE | 107 #define ALLOW_UNUSED_TYPE |
108 #endif | 108 #endif |
109 | 109 |
110 // Annotate a function indicating it should not be inlined. | 110 // Annotate a function indicating it should not be inlined. |
111 // Use like: | 111 // Use like: |
112 // NOINLINE void DoStuff() { ... } | 112 // NOINLINE void DoStuff() { ... } |
113 #if defined(COMPILER_GCC) | 113 #if defined(COMPILER_GCC) |
114 #define NOINLINE __attribute__((noinline)) | 114 #define NOINLINE __attribute__((noinline)) |
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198 // Macro for hinting that an expression is likely to be false. | 198 // Macro for hinting that an expression is likely to be false. |
199 #if !defined(UNLIKELY) | 199 #if !defined(UNLIKELY) |
200 #if defined(COMPILER_GCC) | 200 #if defined(COMPILER_GCC) |
201 #define UNLIKELY(x) __builtin_expect(!!(x), 0) | 201 #define UNLIKELY(x) __builtin_expect(!!(x), 0) |
202 #else | 202 #else |
203 #define UNLIKELY(x) (x) | 203 #define UNLIKELY(x) (x) |
204 #endif // defined(COMPILER_GCC) | 204 #endif // defined(COMPILER_GCC) |
205 #endif // !defined(UNLIKELY) | 205 #endif // !defined(UNLIKELY) |
206 | 206 |
207 #endif // BASE_COMPILER_SPECIFIC_H_ | 207 #endif // BASE_COMPILER_SPECIFIC_H_ |
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