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master
libavutil/attributes.h
235 строк
7 KB
Marvin Scholz
avutil: add av_fallthrough
28 апр 2026, 15:29
28 апр 2026, 15:29
cc863d6
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/* * 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 #ifdef __has_builtin # define AV_HAS_BUILTIN(x) __has_builtin(x) #else # define AV_HAS_BUILTIN(x) 0 #endif #ifdef __has_attribute # define AV_HAS_ATTRIBUTE(x) __has_attribute(x) #else # define AV_HAS_ATTRIBUTE(x) 0 #endif #if defined(__cplusplus) && \ defined(__has_cpp_attribute) && \ __cplusplus >= 201103L # define AV_HAS_STD_ATTRIBUTE(x) __has_cpp_attribute(x) #elif !defined(__cplusplus) && \ defined(__has_c_attribute) && \ defined(__STDC_VERSION__) && \ __STDC_VERSION__ >= 202311L # define AV_HAS_STD_ATTRIBUTE(x) __has_c_attribute(x) #else # define AV_HAS_STD_ATTRIBUTE(x) 0 #endif #if AV_HAS_STD_ATTRIBUTE(fallthrough) # define av_fallthrough [[fallthrough]] #elif AV_HAS_ATTRIBUTE(fallthrough) # define av_fallthrough __attribute__((fallthrough)) #else # define av_fallthrough do {} while(0) #endif #ifndef av_always_inline #if AV_GCC_VERSION_AT_LEAST(3,1) || defined(__clang__) # 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_HAS_STD_ATTRIBUTE(nodiscard) # define av_warn_unused_result [[nodiscard]] #elif AV_GCC_VERSION_AT_LEAST(3,4) || defined(__clang__) # define av_warn_unused_result __attribute__((warn_unused_result)) #else # define av_warn_unused_result #endif #if AV_GCC_VERSION_AT_LEAST(3,1) || defined(__clang__) # 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(__clang__ )) || AV_HAS_ATTRIBUTE(flatten) # define av_flatten __attribute__((flatten)) #else # define av_flatten #endif #if AV_HAS_STD_ATTRIBUTE(deprecated) # define attribute_deprecated [[deprecated]] #elif AV_GCC_VERSION_AT_LEAST(3,1) || defined(__clang__) # 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) || defined(__clang__) # 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 AV_HAS_STD_ATTRIBUTE(maybe_unused) # define av_unused [[maybe_unused]] #elif 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 #else # define av_builtin_constant_p(x) 0 #endif // for __MINGW_PRINTF_FORMAT and __MINGW_SCANF_FORMAT #ifdef __MINGW32__ # include <stdio.h> #endif #ifdef __MINGW_PRINTF_FORMAT # define AV_PRINTF_FMT __MINGW_PRINTF_FORMAT #elif AV_HAS_ATTRIBUTE(format) # define AV_PRINTF_FMT __printf__ #endif #ifdef __MINGW_SCANF_FORMAT # define AV_SCANF_FMT __MINGW_SCANF_FORMAT #elif AV_HAS_ATTRIBUTE(format) # define AV_SCANF_FMT __scanf__ #endif #ifdef AV_PRINTF_FMT # define av_printf_format(fmtpos, attrpos) __attribute__((format(AV_PRINTF_FMT, fmtpos, attrpos))) #else # define av_printf_format(fmtpos, attrpos) #endif #ifdef AV_SCANF_FMT # define av_scanf_format(fmtpos, attrpos) __attribute__((format(AV_SCANF_FMT, fmtpos, attrpos))) #else # define av_scanf_format(fmtpos, attrpos) #endif #if AV_HAS_STD_ATTRIBUTE(noreturn) # define av_noreturn [[noreturn]] #elif AV_GCC_VERSION_AT_LEAST(2,5) || defined(__clang__) # define av_noreturn __attribute__((noreturn)) #else # define av_noreturn #endif #endif /* AVUTIL_ATTRIBUTES_H */