projects / libav.git / blame
| Commit | Line | Data |
|---|---|---|
| 2791730d MR |
1 | /* |
| 2 | * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> | |
| 3 | * | |
| 4 | * This file is part of FFmpeg. | |
| 5 | * | |
| 6 | * FFmpeg is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU Lesser General Public | |
| 8 | * License as published by the Free Software Foundation; either | |
| 9 | * version 2.1 of the License, or (at your option) any later version. | |
| 10 | * | |
| 11 | * FFmpeg is distributed in the hope that it will be useful, | |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | * Lesser General Public License for more details. | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU Lesser General Public | |
| 17 | * License along with FFmpeg; if not, write to the Free Software | |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 19 | */ | |
| 20 | ||
| 21 | /** | |
| ba87f080 | 22 | * @file |
| 2791730d MR |
23 | * Macro definitions for various function/variable attributes |
| 24 | */ | |
| 25 | ||
| 26 | #ifndef AVUTIL_ATTRIBUTES_H | |
| 27 | #define AVUTIL_ATTRIBUTES_H | |
| 28 | ||
| 29 | #ifdef __GNUC__ | |
| 30 | # define AV_GCC_VERSION_AT_LEAST(x,y) (__GNUC__ > x || __GNUC__ == x && __GNUC_MINOR__ >= y) | |
| 31 | #else | |
| 32 | # define AV_GCC_VERSION_AT_LEAST(x,y) 0 | |
| 33 | #endif | |
| 34 | ||
| 35 | #ifndef av_always_inline | |
| 36 | #if AV_GCC_VERSION_AT_LEAST(3,1) | |
| 37 | # define av_always_inline __attribute__((always_inline)) inline | |
| 38 | #else | |
| 39 | # define av_always_inline inline | |
| 40 | #endif | |
| 41 | #endif | |
| 42 | ||
| 43 | #ifndef av_noinline | |
| 44 | #if AV_GCC_VERSION_AT_LEAST(3,1) | |
| 45 | # define av_noinline __attribute__((noinline)) | |
| 46 | #else | |
| 47 | # define av_noinline | |
| 48 | #endif | |
| 49 | #endif | |
| 50 | ||
| 51 | #ifndef av_pure | |
| 52 | #if AV_GCC_VERSION_AT_LEAST(3,1) | |
| 53 | # define av_pure __attribute__((pure)) | |
| 54 | #else | |
| 55 | # define av_pure | |
| 56 | #endif | |
| 57 | #endif | |
| 58 | ||
| 59 | #ifndef av_const | |
| 60 | #if AV_GCC_VERSION_AT_LEAST(2,6) | |
| 61 | # define av_const __attribute__((const)) | |
| 62 | #else | |
| 63 | # define av_const | |
| 64 | #endif | |
| 65 | #endif | |
| 66 | ||
| 67 | #ifndef av_cold | |
| 68 | #if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,3) | |
| 69 | # define av_cold __attribute__((cold)) | |
| 70 | #else | |
| 71 | # define av_cold | |
| 72 | #endif | |
| 73 | #endif | |
| 74 | ||
| 75 | #ifndef av_flatten | |
| 76 | #if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,1) | |
| 77 | # define av_flatten __attribute__((flatten)) | |
| 78 | #else | |
| 79 | # define av_flatten | |
| 80 | #endif | |
| 81 | #endif | |
| 82 | ||
| 83 | #ifndef attribute_deprecated | |
| 84 | #if AV_GCC_VERSION_AT_LEAST(3,1) | |
| 85 | # define attribute_deprecated __attribute__((deprecated)) | |
| 86 | #else | |
| 87 | # define attribute_deprecated | |
| 88 | #endif | |
| 89 | #endif | |
| 90 | ||
| 91 | #ifndef av_unused | |
| 92 | #if defined(__GNUC__) | |
| 93 | # define av_unused __attribute__((unused)) | |
| 94 | #else | |
| 95 | # define av_unused | |
| 96 | #endif | |
| 97 | #endif | |
| 98 | ||
| 365e3c78 MR |
99 | /** |
| 100 | * Mark a variable as used and prevent the compiler from optimizing it | |
| 101 | * away. This is useful for variables accessed only from inline | |
| 102 | * assembler without the compiler being aware. | |
| 103 | */ | |
| 104 | #ifndef av_used | |
| 105 | #if AV_GCC_VERSION_AT_LEAST(3,1) | |
| 106 | # define av_used __attribute__((used)) | |
| 107 | #else | |
| 108 | # define av_used | |
| 109 | #endif | |
| 110 | #endif | |
| 111 | ||
| a74d707c | 112 | #ifndef av_alias |
| 086e997e | 113 | #if (!defined(__ICC) || __ICC > 1200) && AV_GCC_VERSION_AT_LEAST(3,3) |
| a74d707c MN |
114 | # define av_alias __attribute__((may_alias)) |
| 115 | #else | |
| 116 | # define av_alias | |
| 117 | #endif | |
| 118 | #endif | |
| 119 | ||
| 2791730d MR |
120 | #ifndef av_uninit |
| 121 | #if defined(__GNUC__) && !defined(__ICC) | |
| 122 | # define av_uninit(x) x=x | |
| 123 | #else | |
| 124 | # define av_uninit(x) x | |
| 125 | #endif | |
| 126 | #endif | |
| 127 | ||
| 4ed39eed MN |
128 | #ifdef __GNUC__ |
| 129 | # define av_builtin_constant_p __builtin_constant_p | |
| 130 | #else | |
| 131 | # define av_builtin_constant_p(x) 0 | |
| 132 | #endif | |
| 133 | ||
| 2791730d | 134 | #endif /* AVUTIL_ATTRIBUTES_H */ |