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2134
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1 /*
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2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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3 *
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4 * This file is part of FFmpeg.
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5 *
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6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 2.1 of the License, or (at your option) any later version.
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10 *
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11 * FFmpeg is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
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20
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21 /**
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22 * @file
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23 * Macro definitions for various function/variable attributes
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24 */
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25
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26 #ifndef AVUTIL_ATTRIBUTES_H
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27 #define AVUTIL_ATTRIBUTES_H
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28
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29 #ifdef __GNUC__
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30 # define AV_GCC_VERSION_AT_LEAST(x,y) (__GNUC__ > x || __GNUC__ == x && __GNUC_MINOR__ >= y)
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31 #else
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32 # define AV_GCC_VERSION_AT_LEAST(x,y) 0
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33 #endif
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34
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35 #ifndef av_always_inline
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36 #if AV_GCC_VERSION_AT_LEAST(3,1)
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37 # define av_always_inline __attribute__((always_inline)) inline
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38 #elif defined(_MSC_VER)
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39 # define av_always_inline __forceinline
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40 #else
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41 # define av_always_inline inline
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42 #endif
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43 #endif
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44
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45 #ifndef av_extern_inline
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46 #if defined(__ICL) && __ICL >= 1210 || defined(__GNUC_STDC_INLINE__)
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47 # define av_extern_inline extern inline
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48 #else
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49 # define av_extern_inline inline
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50 #endif
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51 #endif
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52
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53 #if AV_GCC_VERSION_AT_LEAST(3,1)
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54 # define av_noinline __attribute__((noinline))
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55 #else
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56 # define av_noinline
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57 #endif
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58
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59 #if AV_GCC_VERSION_AT_LEAST(3,1)
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60 # define av_pure __attribute__((pure))
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61 #else
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62 # define av_pure
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63 #endif
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64
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65 #ifndef av_restrict
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66 #define av_restrict restrict
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67 #endif
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68
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69 #if AV_GCC_VERSION_AT_LEAST(2,6)
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70 # define av_const __attribute__((const))
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71 #else
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72 # define av_const
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73 #endif
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74
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75 #if AV_GCC_VERSION_AT_LEAST(4,3)
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76 # define av_cold __attribute__((cold))
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77 #else
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78 # define av_cold
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79 #endif
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80
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81 #if AV_GCC_VERSION_AT_LEAST(4,1)
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82 # define av_flatten __attribute__((flatten))
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83 #else
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84 # define av_flatten
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85 #endif
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86
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87 #if AV_GCC_VERSION_AT_LEAST(3,1)
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88 # define attribute_deprecated __attribute__((deprecated))
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89 #else
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90 # define attribute_deprecated
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91 #endif
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92
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93 /**
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94 * Disable warnings about deprecated features
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95 * This is useful for sections of code kept for backward compatibility and
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96 * scheduled for removal.
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97 */
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98 #ifndef AV_NOWARN_DEPRECATED
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99 #if AV_GCC_VERSION_AT_LEAST(4,6)
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100 # define AV_NOWARN_DEPRECATED(code) \
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101 _Pragma("GCC diagnostic push") \
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102 _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") \
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103 code \
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104 _Pragma("GCC diagnostic pop")
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105 #else
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106 # define AV_NOWARN_DEPRECATED(code) code
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107 #endif
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108 #endif
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109
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110
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111 #if defined(__GNUC__)
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112 # define av_unused __attribute__((unused))
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113 #else
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114 # define av_unused
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115 #endif
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116
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117 /**
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118 * Mark a variable as used and prevent the compiler from optimizing it
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119 * away. This is useful for variables accessed only from inline
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120 * assembler without the compiler being aware.
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121 */
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122 #if AV_GCC_VERSION_AT_LEAST(3,1)
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123 # define av_used __attribute__((used))
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124 #else
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125 # define av_used
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126 #endif
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127
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128 #if AV_GCC_VERSION_AT_LEAST(3,3)
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129 # define av_alias __attribute__((may_alias))
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130 #else
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131 # define av_alias
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132 #endif
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133
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134 #if defined(__GNUC__) && !defined(__INTEL_COMPILER) && !defined(__clang__)
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135 # define av_uninit(x) x=x
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136 #else
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137 # define av_uninit(x) x
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138 #endif
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139
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140 #ifdef __GNUC__
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141 # define av_builtin_constant_p __builtin_constant_p
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142 # define av_printf_format(fmtpos, attrpos) __attribute__((__format__(__printf__, fmtpos, attrpos)))
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143 #else
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144 # define av_builtin_constant_p(x) 0
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145 # define av_printf_format(fmtpos, attrpos)
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146 #endif
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147
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148 #if AV_GCC_VERSION_AT_LEAST(2,5)
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149 # define av_noreturn __attribute__((noreturn))
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150 #else
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151 # define av_noreturn
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152 #endif
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153
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154 #endif /* AVUTIL_ATTRIBUTES_H */
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