attributes.h (3284B)
1 /* 2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> 3 * 4 * This file is part of Libav. 5 * 6 * Libav 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 * Libav 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 Libav; 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 #else 32 # define AV_GCC_VERSION_AT_LEAST(x,y) 0 33 #endif 34 35 #if AV_GCC_VERSION_AT_LEAST(3,1) 36 # define av_always_inline __attribute__((always_inline)) inline 37 #elif defined(_MSC_VER) 38 # define av_always_inline __forceinline 39 #else 40 # define av_always_inline inline 41 #endif 42 43 #if AV_GCC_VERSION_AT_LEAST(3,1) 44 # define av_noinline __attribute__((noinline)) 45 #elif defined(_MSC_VER) 46 # define av_noinline __declspec(noinline) 47 #else 48 # define av_noinline 49 #endif 50 51 #if AV_GCC_VERSION_AT_LEAST(3,1) 52 # define av_pure __attribute__((pure)) 53 #else 54 # define av_pure 55 #endif 56 57 #if AV_GCC_VERSION_AT_LEAST(2,6) 58 # define av_const __attribute__((const)) 59 #else 60 # define av_const 61 #endif 62 63 #if AV_GCC_VERSION_AT_LEAST(4,3) 64 # define av_cold __attribute__((cold)) 65 #else 66 # define av_cold 67 #endif 68 69 #if AV_GCC_VERSION_AT_LEAST(4,1) && !defined(__llvm__) 70 # define av_flatten __attribute__((flatten)) 71 #else 72 # define av_flatten 73 #endif 74 75 #if AV_GCC_VERSION_AT_LEAST(3,1) 76 # define attribute_deprecated __attribute__((deprecated)) 77 #elif defined(_MSC_VER) 78 # define attribute_deprecated __declspec(deprecated) 79 #else 80 # define attribute_deprecated 81 #endif 82 83 #if defined(__GNUC__) 84 # define av_unused __attribute__((unused)) 85 #else 86 # define av_unused 87 #endif 88 89 /** 90 * Mark a variable as used and prevent the compiler from optimizing it 91 * away. This is useful for variables accessed only from inline 92 * assembler without the compiler being aware. 93 */ 94 #if AV_GCC_VERSION_AT_LEAST(3,1) 95 # define av_used __attribute__((used)) 96 #else 97 # define av_used 98 #endif 99 100 #if AV_GCC_VERSION_AT_LEAST(3,3) 101 # define av_alias __attribute__((may_alias)) 102 #else 103 # define av_alias 104 #endif 105 106 #if defined(__GNUC__) && !defined(__ICC) 107 # define av_uninit(x) x=x 108 #else 109 # define av_uninit(x) x 110 #endif 111 112 #ifdef __GNUC__ 113 # define av_builtin_constant_p __builtin_constant_p 114 # define av_printf_format(fmtpos, attrpos) __attribute__((__format__(__printf__, fmtpos, attrpos))) 115 #else 116 # define av_builtin_constant_p(x) 0 117 # define av_printf_format(fmtpos, attrpos) 118 #endif 119 120 #if AV_GCC_VERSION_AT_LEAST(2,5) 121 # define av_noreturn __attribute__((noreturn)) 122 #else 123 # define av_noreturn 124 #endif 125 126 #endif /* AVUTIL_ATTRIBUTES_H */