blob: 54d1901116912bd95de74918e1cfe47b9bd47610
| 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 | /** |
| 22 | * @file |
| 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 | # define AV_GCC_VERSION_AT_MOST(x,y) (__GNUC__ < (x) || __GNUC__ == (x) && __GNUC_MINOR__ <= (y)) |
| 32 | #else |
| 33 | # define AV_GCC_VERSION_AT_LEAST(x,y) 0 |
| 34 | # define AV_GCC_VERSION_AT_MOST(x,y) 0 |
| 35 | #endif |
| 36 | |
| 37 | #ifndef av_always_inline |
| 38 | #if AV_GCC_VERSION_AT_LEAST(3,1) |
| 39 | # define av_always_inline __attribute__((always_inline)) inline |
| 40 | #elif defined(_MSC_VER) |
| 41 | # define av_always_inline __forceinline |
| 42 | #else |
| 43 | # define av_always_inline inline |
| 44 | #endif |
| 45 | #endif |
| 46 | |
| 47 | #ifndef av_extern_inline |
| 48 | #if defined(__ICL) && __ICL >= 1210 || defined(__GNUC_STDC_INLINE__) |
| 49 | # define av_extern_inline extern inline |
| 50 | #else |
| 51 | # define av_extern_inline inline |
| 52 | #endif |
| 53 | #endif |
| 54 | |
| 55 | #if AV_GCC_VERSION_AT_LEAST(3,4) |
| 56 | # define av_warn_unused_result __attribute__((warn_unused_result)) |
| 57 | #else |
| 58 | # define av_warn_unused_result |
| 59 | #endif |
| 60 | |
| 61 | #if AV_GCC_VERSION_AT_LEAST(3,1) |
| 62 | # define av_noinline __attribute__((noinline)) |
| 63 | #elif defined(_MSC_VER) |
| 64 | # define av_noinline __declspec(noinline) |
| 65 | #else |
| 66 | # define av_noinline |
| 67 | #endif |
| 68 | |
| 69 | #if AV_GCC_VERSION_AT_LEAST(3,1) |
| 70 | # define av_pure __attribute__((pure)) |
| 71 | #else |
| 72 | # define av_pure |
| 73 | #endif |
| 74 | |
| 75 | #if AV_GCC_VERSION_AT_LEAST(2,6) |
| 76 | # define av_const __attribute__((const)) |
| 77 | #else |
| 78 | # define av_const |
| 79 | #endif |
| 80 | |
| 81 | #if AV_GCC_VERSION_AT_LEAST(4,3) |
| 82 | # define av_cold __attribute__((cold)) |
| 83 | #else |
| 84 | # define av_cold |
| 85 | #endif |
| 86 | |
| 87 | #if AV_GCC_VERSION_AT_LEAST(4,1) && !defined(__llvm__) |
| 88 | # define av_flatten __attribute__((flatten)) |
| 89 | #else |
| 90 | # define av_flatten |
| 91 | #endif |
| 92 | |
| 93 | #if AV_GCC_VERSION_AT_LEAST(3,1) |
| 94 | # define attribute_deprecated __attribute__((deprecated)) |
| 95 | #elif defined(_MSC_VER) |
| 96 | # define attribute_deprecated __declspec(deprecated) |
| 97 | #else |
| 98 | # define attribute_deprecated |
| 99 | #endif |
| 100 | |
| 101 | /** |
| 102 | * Disable warnings about deprecated features |
| 103 | * This is useful for sections of code kept for backward compatibility and |
| 104 | * scheduled for removal. |
| 105 | */ |
| 106 | #ifndef AV_NOWARN_DEPRECATED |
| 107 | #if AV_GCC_VERSION_AT_LEAST(4,6) |
| 108 | # define AV_NOWARN_DEPRECATED(code) \ |
| 109 | _Pragma("GCC diagnostic push") \ |
| 110 | _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") \ |
| 111 | code \ |
| 112 | _Pragma("GCC diagnostic pop") |
| 113 | #elif defined(_MSC_VER) |
| 114 | # define AV_NOWARN_DEPRECATED(code) \ |
| 115 | __pragma(warning(push)) \ |
| 116 | __pragma(warning(disable : 4996)) \ |
| 117 | code; \ |
| 118 | __pragma(warning(pop)) |
| 119 | #else |
| 120 | # define AV_NOWARN_DEPRECATED(code) code |
| 121 | #endif |
| 122 | #endif |
| 123 | |
| 124 | #if defined(__GNUC__) || defined(__clang__) |
| 125 | # define av_unused __attribute__((unused)) |
| 126 | #else |
| 127 | # define av_unused |
| 128 | #endif |
| 129 | |
| 130 | /** |
| 131 | * Mark a variable as used and prevent the compiler from optimizing it |
| 132 | * away. This is useful for variables accessed only from inline |
| 133 | * assembler without the compiler being aware. |
| 134 | */ |
| 135 | #if AV_GCC_VERSION_AT_LEAST(3,1) || defined(__clang__) |
| 136 | # define av_used __attribute__((used)) |
| 137 | #else |
| 138 | # define av_used |
| 139 | #endif |
| 140 | |
| 141 | #if AV_GCC_VERSION_AT_LEAST(3,3) |
| 142 | # define av_alias __attribute__((may_alias)) |
| 143 | #else |
| 144 | # define av_alias |
| 145 | #endif |
| 146 | |
| 147 | #if defined(__GNUC__) && !defined(__INTEL_COMPILER) && !defined(__clang__) |
| 148 | # define av_uninit(x) x=x |
| 149 | #else |
| 150 | # define av_uninit(x) x |
| 151 | #endif |
| 152 | |
| 153 | #ifdef __GNUC__ |
| 154 | # define av_builtin_constant_p __builtin_constant_p |
| 155 | # define av_printf_format(fmtpos, attrpos) __attribute__((__format__(__printf__, fmtpos, attrpos))) |
| 156 | #else |
| 157 | # define av_builtin_constant_p(x) 0 |
| 158 | # define av_printf_format(fmtpos, attrpos) |
| 159 | #endif |
| 160 | |
| 161 | #if AV_GCC_VERSION_AT_LEAST(2,5) |
| 162 | # define av_noreturn __attribute__((noreturn)) |
| 163 | #else |
| 164 | # define av_noreturn |
| 165 | #endif |
| 166 | |
| 167 | #endif /* AVUTIL_ATTRIBUTES_H */ |
| 168 |