Mercurial > hg > forks > libbpg
comparison libavutil/attributes.h @ 0:772086c29cc7
Initial import.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Wed, 16 Nov 2016 11:16:33 +0200 |
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-1:000000000000 | 0:772086c29cc7 |
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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 #elif defined(_MSC_VER) | |
56 # define av_noinline __declspec(noinline) | |
57 #else | |
58 # define av_noinline | |
59 #endif | |
60 | |
61 #if AV_GCC_VERSION_AT_LEAST(3,1) | |
62 # define av_pure __attribute__((pure)) | |
63 #else | |
64 # define av_pure | |
65 #endif | |
66 | |
67 #if AV_GCC_VERSION_AT_LEAST(2,6) | |
68 # define av_const __attribute__((const)) | |
69 #else | |
70 # define av_const | |
71 #endif | |
72 | |
73 #if AV_GCC_VERSION_AT_LEAST(4,3) | |
74 # define av_cold __attribute__((cold)) | |
75 #else | |
76 # define av_cold | |
77 #endif | |
78 | |
79 #if AV_GCC_VERSION_AT_LEAST(4,1) && !defined(__llvm__) | |
80 # define av_flatten __attribute__((flatten)) | |
81 #else | |
82 # define av_flatten | |
83 #endif | |
84 | |
85 #if AV_GCC_VERSION_AT_LEAST(3,1) | |
86 # define attribute_deprecated __attribute__((deprecated)) | |
87 #elif defined(_MSC_VER) | |
88 # define attribute_deprecated __declspec(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 #elif defined(_MSC_VER) | |
106 # define AV_NOWARN_DEPRECATED(code) \ | |
107 __pragma(warning(push)) \ | |
108 __pragma(warning(disable : 4996)) \ | |
109 code; \ | |
110 __pragma(warning(pop)) | |
111 #else | |
112 # define AV_NOWARN_DEPRECATED(code) code | |
113 #endif | |
114 #endif | |
115 | |
116 | |
117 #if defined(__GNUC__) | |
118 # define av_unused __attribute__((unused)) | |
119 #else | |
120 # define av_unused | |
121 #endif | |
122 | |
123 /** | |
124 * Mark a variable as used and prevent the compiler from optimizing it | |
125 * away. This is useful for variables accessed only from inline | |
126 * assembler without the compiler being aware. | |
127 */ | |
128 #if AV_GCC_VERSION_AT_LEAST(3,1) | |
129 # define av_used __attribute__((used)) | |
130 #else | |
131 # define av_used | |
132 #endif | |
133 | |
134 #if AV_GCC_VERSION_AT_LEAST(3,3) | |
135 # define av_alias __attribute__((may_alias)) | |
136 #else | |
137 # define av_alias | |
138 #endif | |
139 | |
140 #if defined(__GNUC__) && !defined(__INTEL_COMPILER) && !defined(__clang__) | |
141 # define av_uninit(x) x=x | |
142 #else | |
143 # define av_uninit(x) x | |
144 #endif | |
145 | |
146 #ifdef __GNUC__ | |
147 # define av_builtin_constant_p __builtin_constant_p | |
148 # define av_printf_format(fmtpos, attrpos) __attribute__((__format__(__printf__, fmtpos, attrpos))) | |
149 #else | |
150 # define av_builtin_constant_p(x) 0 | |
151 # define av_printf_format(fmtpos, attrpos) | |
152 #endif | |
153 | |
154 #if AV_GCC_VERSION_AT_LEAST(2,5) | |
155 # define av_noreturn __attribute__((noreturn)) | |
156 #else | |
157 # define av_noreturn | |
158 #endif | |
159 | |
160 #endif /* AVUTIL_ATTRIBUTES_H */ |