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comparison lib/libavutil/attributes.h @ 2134:992d2e6f907d

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preparation for libavcodec
author zipi
date Tue, 31 Dec 2013 14:52:14 +0000
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2133:e378232bfd36 2134:992d2e6f907d
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 #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 #elif defined(_MSC_VER)
39 # define av_always_inline __forceinline
40 #else
41 # define av_always_inline inline
42 #endif
43 #endif
44
45 #ifndef av_extern_inline
46 #if defined(__ICL) && __ICL >= 1210 || defined(__GNUC_STDC_INLINE__)
47 # define av_extern_inline extern inline
48 #else
49 # define av_extern_inline inline
50 #endif
51 #endif
52
53 #if AV_GCC_VERSION_AT_LEAST(3,1)
54 # define av_noinline __attribute__((noinline))
55 #else
56 # define av_noinline
57 #endif
58
59 #if AV_GCC_VERSION_AT_LEAST(3,1)
60 # define av_pure __attribute__((pure))
61 #else
62 # define av_pure
63 #endif
64
65 #ifndef av_restrict
66 #define av_restrict restrict
67 #endif
68
69 #if AV_GCC_VERSION_AT_LEAST(2,6)
70 # define av_const __attribute__((const))
71 #else
72 # define av_const
73 #endif
74
75 #if AV_GCC_VERSION_AT_LEAST(4,3)
76 # define av_cold __attribute__((cold))
77 #else
78 # define av_cold
79 #endif
80
81 #if AV_GCC_VERSION_AT_LEAST(4,1)
82 # define av_flatten __attribute__((flatten))
83 #else
84 # define av_flatten
85 #endif
86
87 #if AV_GCC_VERSION_AT_LEAST(3,1)
88 # define attribute_deprecated __attribute__((deprecated))
89 #else
90 # define attribute_deprecated
91 #endif
92
93 /**
94 * Disable warnings about deprecated features
95 * This is useful for sections of code kept for backward compatibility and
96 * scheduled for removal.
97 */
98 #ifndef AV_NOWARN_DEPRECATED
99 #if AV_GCC_VERSION_AT_LEAST(4,6)
100 # define AV_NOWARN_DEPRECATED(code) \
101 _Pragma("GCC diagnostic push") \
102 _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") \
103 code \
104 _Pragma("GCC diagnostic pop")
105 #else
106 # define AV_NOWARN_DEPRECATED(code) code
107 #endif
108 #endif
109
110
111 #if defined(__GNUC__)
112 # define av_unused __attribute__((unused))
113 #else
114 # define av_unused
115 #endif
116
117 /**
118 * Mark a variable as used and prevent the compiler from optimizing it
119 * away. This is useful for variables accessed only from inline
120 * assembler without the compiler being aware.
121 */
122 #if AV_GCC_VERSION_AT_LEAST(3,1)
123 # define av_used __attribute__((used))
124 #else
125 # define av_used
126 #endif
127
128 #if AV_GCC_VERSION_AT_LEAST(3,3)
129 # define av_alias __attribute__((may_alias))
130 #else
131 # define av_alias
132 #endif
133
134 #if defined(__GNUC__) && !defined(__INTEL_COMPILER) && !defined(__clang__)
135 # define av_uninit(x) x=x
136 #else
137 # define av_uninit(x) x
138 #endif
139
140 #ifdef __GNUC__
141 # define av_builtin_constant_p __builtin_constant_p
142 # define av_printf_format(fmtpos, attrpos) __attribute__((__format__(__printf__, fmtpos, attrpos)))
143 #else
144 # define av_builtin_constant_p(x) 0
145 # define av_printf_format(fmtpos, attrpos)
146 #endif
147
148 #if AV_GCC_VERSION_AT_LEAST(2,5)
149 # define av_noreturn __attribute__((noreturn))
150 #else
151 # define av_noreturn
152 #endif
153
154 #endif /* AVUTIL_ATTRIBUTES_H */