aboutsummaryrefslogtreecommitdiffstats
path: root/libavutil/attributes.h
blob: ced108aa2c75afdf467f91a3faa1cb05af6e9726 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/*
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Macro definitions for various function/variable attributes
 */

#ifndef AVUTIL_ATTRIBUTES_H
#define AVUTIL_ATTRIBUTES_H

#ifdef __GNUC__
#    define AV_GCC_VERSION_AT_LEAST(x,y) (__GNUC__ > (x) || __GNUC__ == (x) && __GNUC_MINOR__ >= (y))
#    define AV_GCC_VERSION_AT_MOST(x,y)  (__GNUC__ < (x) || __GNUC__ == (x) && __GNUC_MINOR__ <= (y))
#else
#    define AV_GCC_VERSION_AT_LEAST(x,y) 0
#    define AV_GCC_VERSION_AT_MOST(x,y)  0
#endif

#ifndef av_always_inline
#if AV_GCC_VERSION_AT_LEAST(3,1)
#    define av_always_inline __attribute__((always_inline)) inline
#elif defined(_MSC_VER)
#    define av_always_inline __forceinline
#else
#    define av_always_inline inline
#endif
#endif

#ifndef av_extern_inline
#if defined(__ICL) && __ICL >= 1210 || defined(__GNUC_STDC_INLINE__)
#    define av_extern_inline extern inline
#else
#    define av_extern_inline inline
#endif
#endif

#if AV_GCC_VERSION_AT_LEAST(3,4)
#    define av_warn_unused_result __attribute__((warn_unused_result))
#else
#    define av_warn_unused_result
#endif

#if AV_GCC_VERSION_AT_LEAST(3,1)
#    define av_noinline __attribute__((noinline))
#elif defined(_MSC_VER)
#    define av_noinline __declspec(noinline)
#else
#    define av_noinline
#endif

#if AV_GCC_VERSION_AT_LEAST(3,1) || defined(__clang__)
#    define av_pure __attribute__((pure))
#else
#    define av_pure
#endif

#if AV_GCC_VERSION_AT_LEAST(2,6) || defined(__clang__)
#    define av_const __attribute__((const))
#else
#    define av_const
#endif

#if AV_GCC_VERSION_AT_LEAST(4,3) || defined(__clang__)
#    define av_cold __attribute__((cold))
#else
#    define av_cold
#endif

#if AV_GCC_VERSION_AT_LEAST(4,1) && !defined(__llvm__)
#    define av_flatten __attribute__((flatten))
#else
#    define av_flatten
#endif

#if AV_GCC_VERSION_AT_LEAST(3,1)
#    define attribute_deprecated __attribute__((deprecated))
#elif defined(_MSC_VER)
#    define attribute_deprecated __declspec(deprecated)
#else
#    define attribute_deprecated
#endif

/**
 * Disable warnings about deprecated features
 * This is useful for sections of code kept for backward compatibility and
 * scheduled for removal.
 */
#ifndef AV_NOWARN_DEPRECATED
#if AV_GCC_VERSION_AT_LEAST(4,6)
#    define AV_NOWARN_DEPRECATED(code) \
        _Pragma("GCC diagnostic push") \
        _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") \
        code \
        _Pragma("GCC diagnostic pop")
#elif defined(_MSC_VER)
#    define AV_NOWARN_DEPRECATED(code) \
        __pragma(warning(push)) \
        __pragma(warning(disable : 4996)) \
        code; \
        __pragma(warning(pop))
#else
#    define AV_NOWARN_DEPRECATED(code) code
#endif
#endif

#if defined(__GNUC__) || defined(__clang__)
#    define av_unused __attribute__((unused))
#else
#    define av_unused
#endif

/**
 * Mark a variable as used and prevent the compiler from optimizing it
 * away.  This is useful for variables accessed only from inline
 * assembler without the compiler being aware.
 */
#if AV_GCC_VERSION_AT_LEAST(3,1) || defined(__clang__)
#    define av_used __attribute__((used))
#else
#    define av_used
#endif

#if AV_GCC_VERSION_AT_LEAST(3,3) || defined(__clang__)
#   define av_alias __attribute__((may_alias))
#else
#   define av_alias
#endif

#if (defined(__GNUC__) || defined(__clang__)) && !defined(__INTEL_COMPILER)
#    define av_uninit(x) x=x
#else
#    define av_uninit(x) x
#endif

#if defined(__GNUC__) || defined(__clang__)
#    define av_builtin_constant_p __builtin_constant_p
#    define av_printf_format(fmtpos, attrpos) __attribute__((__format__(__printf__, fmtpos, attrpos)))
#else
#    define av_builtin_constant_p(x) 0
#    define av_printf_format(fmtpos, attrpos)
#endif

#if AV_GCC_VERSION_AT_LEAST(2,5) || defined(__clang__)
#    define av_noreturn __attribute__((noreturn))
#else
#    define av_noreturn
#endif

#endif /* AVUTIL_ATTRIBUTES_H */