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n6.1.3
libavutil/intreadwrite.h
642 строки
18 KB
Martin Storsjö
intreadwrite: Indicate potential aliasing in AV_RN/AV_WN for Clang/MSVC mode
04 авг 2023, 21:50
04 авг 2023, 21:50
62fac04
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/* * 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 */ #ifndef AVUTIL_INTREADWRITE_H #define AVUTIL_INTREADWRITE_H #include <stdint.h> #include "libavutil/avconfig.h" #include "attributes.h" #include "bswap.h" typedef union { uint64_t u64; uint32_t u32[2]; uint16_t u16[4]; uint8_t u8 [8]; double f64; float f32[2]; } av_alias av_alias64; typedef union { uint32_t u32; uint16_t u16[2]; uint8_t u8 [4]; float f32; } av_alias av_alias32; typedef union { uint16_t u16; uint8_t u8 [2]; } av_alias av_alias16; /* * Arch-specific headers can provide any combination of * AV_[RW][BLN](16|24|32|48|64) and AV_(COPY|SWAP|ZERO)(64|128) macros. * Preprocessor symbols must be defined, even if these are implemented * as inline functions. * * R/W means read/write, B/L/N means big/little/native endianness. * The following macros require aligned access, compared to their * unaligned variants: AV_(COPY|SWAP|ZERO)(64|128), AV_[RW]N[8-64]A. * Incorrect usage may range from abysmal performance to crash * depending on the platform. * * The unaligned variants are AV_[RW][BLN][8-64] and AV_COPY*U. */ #ifdef HAVE_AV_CONFIG_H #include "config.h" #if ARCH_ARM # include "arm/intreadwrite.h" #elif ARCH_AVR32 # include "avr32/intreadwrite.h" #elif ARCH_MIPS # include "mips/intreadwrite.h" #elif ARCH_PPC # include "ppc/intreadwrite.h" #elif ARCH_X86 # include "x86/intreadwrite.h" #endif #endif /* HAVE_AV_CONFIG_H */ /* * Map AV_RNXX <-> AV_R[BL]XX for all variants provided by per-arch headers. */ #if AV_HAVE_BIGENDIAN # if defined(AV_RN16) && !defined(AV_RB16) # define AV_RB16(p) AV_RN16(p) # elif !defined(AV_RN16) && defined(AV_RB16) # define AV_RN16(p) AV_RB16(p) # endif # if defined(AV_WN16) && !defined(AV_WB16) # define AV_WB16(p, v) AV_WN16(p, v) # elif !defined(AV_WN16) && defined(AV_WB16) # define AV_WN16(p, v) AV_WB16(p, v) # endif # if defined(AV_RN24) && !defined(AV_RB24) # define AV_RB24(p) AV_RN24(p) # elif !defined(AV_RN24) && defined(AV_RB24) # define AV_RN24(p) AV_RB24(p) # endif # if defined(AV_WN24) && !defined(AV_WB24) # define AV_WB24(p, v) AV_WN24(p, v) # elif !defined(AV_WN24) && defined(AV_WB24) # define AV_WN24(p, v) AV_WB24(p, v) # endif # if defined(AV_RN32) && !defined(AV_RB32) # define AV_RB32(p) AV_RN32(p) # elif !defined(AV_RN32) && defined(AV_RB32) # define AV_RN32(p) AV_RB32(p) # endif # if defined(AV_WN32) && !defined(AV_WB32) # define AV_WB32(p, v) AV_WN32(p, v) # elif !defined(AV_WN32) && defined(AV_WB32) # define AV_WN32(p, v) AV_WB32(p, v) # endif # if defined(AV_RN48) && !defined(AV_RB48) # define AV_RB48(p) AV_RN48(p) # elif !defined(AV_RN48) && defined(AV_RB48) # define AV_RN48(p) AV_RB48(p) # endif # if defined(AV_WN48) && !defined(AV_WB48) # define AV_WB48(p, v) AV_WN48(p, v) # elif !defined(AV_WN48) && defined(AV_WB48) # define AV_WN48(p, v) AV_WB48(p, v) # endif # if defined(AV_RN64) && !defined(AV_RB64) # define AV_RB64(p) AV_RN64(p) # elif !defined(AV_RN64) && defined(AV_RB64) # define AV_RN64(p) AV_RB64(p) # endif # if defined(AV_WN64) && !defined(AV_WB64) # define AV_WB64(p, v) AV_WN64(p, v) # elif !defined(AV_WN64) && defined(AV_WB64) # define AV_WN64(p, v) AV_WB64(p, v) # endif #else /* AV_HAVE_BIGENDIAN */ # if defined(AV_RN16) && !defined(AV_RL16) # define AV_RL16(p) AV_RN16(p) # elif !defined(AV_RN16) && defined(AV_RL16) # define AV_RN16(p) AV_RL16(p) # endif # if defined(AV_WN16) && !defined(AV_WL16) # define AV_WL16(p, v) AV_WN16(p, v) # elif !defined(AV_WN16) && defined(AV_WL16) # define AV_WN16(p, v) AV_WL16(p, v) # endif # if defined(AV_RN24) && !defined(AV_RL24) # define AV_RL24(p) AV_RN24(p) # elif !defined(AV_RN24) && defined(AV_RL24) # define AV_RN24(p) AV_RL24(p) # endif # if defined(AV_WN24) && !defined(AV_WL24) # define AV_WL24(p, v) AV_WN24(p, v) # elif !defined(AV_WN24) && defined(AV_WL24) # define AV_WN24(p, v) AV_WL24(p, v) # endif # if defined(AV_RN32) && !defined(AV_RL32) # define AV_RL32(p) AV_RN32(p) # elif !defined(AV_RN32) && defined(AV_RL32) # define AV_RN32(p) AV_RL32(p) # endif # if defined(AV_WN32) && !defined(AV_WL32) # define AV_WL32(p, v) AV_WN32(p, v) # elif !defined(AV_WN32) && defined(AV_WL32) # define AV_WN32(p, v) AV_WL32(p, v) # endif # if defined(AV_RN48) && !defined(AV_RL48) # define AV_RL48(p) AV_RN48(p) # elif !defined(AV_RN48) && defined(AV_RL48) # define AV_RN48(p) AV_RL48(p) # endif # if defined(AV_WN48) && !defined(AV_WL48) # define AV_WL48(p, v) AV_WN48(p, v) # elif !defined(AV_WN48) && defined(AV_WL48) # define AV_WN48(p, v) AV_WL48(p, v) # endif # if defined(AV_RN64) && !defined(AV_RL64) # define AV_RL64(p) AV_RN64(p) # elif !defined(AV_RN64) && defined(AV_RL64) # define AV_RN64(p) AV_RL64(p) # endif # if defined(AV_WN64) && !defined(AV_WL64) # define AV_WL64(p, v) AV_WN64(p, v) # elif !defined(AV_WN64) && defined(AV_WL64) # define AV_WN64(p, v) AV_WL64(p, v) # endif #endif /* !AV_HAVE_BIGENDIAN */ /* * Define AV_[RW]N helper macros to simplify definitions not provided * by per-arch headers. */ #if defined(__GNUC__) || defined(__clang__) union unaligned_64 { uint64_t l; } __attribute__((packed)) av_alias; union unaligned_32 { uint32_t l; } __attribute__((packed)) av_alias; union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias; # define AV_RN(s, p) (((const union unaligned_##s *) (p))->l) # define AV_WN(s, p, v) ((((union unaligned_##s *) (p))->l) = (v)) #elif defined(_MSC_VER) && (defined(_M_ARM) || defined(_M_X64) || defined(_M_ARM64)) && AV_HAVE_FAST_UNALIGNED # define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p))) # define AV_WN(s, p, v) (*((__unaligned uint##s##_t*)(p)) = (v)) #elif AV_HAVE_FAST_UNALIGNED # define AV_RN(s, p) (((const av_alias##s*)(p))->u##s) # define AV_WN(s, p, v) (((av_alias##s*)(p))->u##s = (v)) #else #ifndef AV_RB16 # define AV_RB16(x) \ ((((const uint8_t*)(x))[0] << 8) | \ ((const uint8_t*)(x))[1]) #endif #ifndef AV_WB16 # define AV_WB16(p, val) do { \ uint16_t d = (val); \ ((uint8_t*)(p))[1] = (d); \ ((uint8_t*)(p))[0] = (d)>>8; \ } while(0) #endif #ifndef AV_RL16 # define AV_RL16(x) \ ((((const uint8_t*)(x))[1] << 8) | \ ((const uint8_t*)(x))[0]) #endif #ifndef AV_WL16 # define AV_WL16(p, val) do { \ uint16_t d = (val); \ ((uint8_t*)(p))[0] = (d); \ ((uint8_t*)(p))[1] = (d)>>8; \ } while(0) #endif #ifndef AV_RB32 # define AV_RB32(x) \ (((uint32_t)((const uint8_t*)(x))[0] << 24) | \ (((const uint8_t*)(x))[1] << 16) | \ (((const uint8_t*)(x))[2] << 8) | \ ((const uint8_t*)(x))[3]) #endif #ifndef AV_WB32 # define AV_WB32(p, val) do { \ uint32_t d = (val); \ ((uint8_t*)(p))[3] = (d); \ ((uint8_t*)(p))[2] = (d)>>8; \ ((uint8_t*)(p))[1] = (d)>>16; \ ((uint8_t*)(p))[0] = (d)>>24; \ } while(0) #endif #ifndef AV_RL32 # define AV_RL32(x) \ (((uint32_t)((const uint8_t*)(x))[3] << 24) | \ (((const uint8_t*)(x))[2] << 16) | \ (((const uint8_t*)(x))[1] << 8) | \ ((const uint8_t*)(x))[0]) #endif #ifndef AV_WL32 # define AV_WL32(p, val) do { \ uint32_t d = (val); \ ((uint8_t*)(p))[0] = (d); \ ((uint8_t*)(p))[1] = (d)>>8; \ ((uint8_t*)(p))[2] = (d)>>16; \ ((uint8_t*)(p))[3] = (d)>>24; \ } while(0) #endif #ifndef AV_RB64 # define AV_RB64(x) \ (((uint64_t)((const uint8_t*)(x))[0] << 56) | \ ((uint64_t)((const uint8_t*)(x))[1] << 48) | \ ((uint64_t)((const uint8_t*)(x))[2] << 40) | \ ((uint64_t)((const uint8_t*)(x))[3] << 32) | \ ((uint64_t)((const uint8_t*)(x))[4] << 24) | \ ((uint64_t)((const uint8_t*)(x))[5] << 16) | \ ((uint64_t)((const uint8_t*)(x))[6] << 8) | \ (uint64_t)((const uint8_t*)(x))[7]) #endif #ifndef AV_WB64 # define AV_WB64(p, val) do { \ uint64_t d = (val); \ ((uint8_t*)(p))[7] = (d); \ ((uint8_t*)(p))[6] = (d)>>8; \ ((uint8_t*)(p))[5] = (d)>>16; \ ((uint8_t*)(p))[4] = (d)>>24; \ ((uint8_t*)(p))[3] = (d)>>32; \ ((uint8_t*)(p))[2] = (d)>>40; \ ((uint8_t*)(p))[1] = (d)>>48; \ ((uint8_t*)(p))[0] = (d)>>56; \ } while(0) #endif #ifndef AV_RL64 # define AV_RL64(x) \ (((uint64_t)((const uint8_t*)(x))[7] << 56) | \ ((uint64_t)((const uint8_t*)(x))[6] << 48) | \ ((uint64_t)((const uint8_t*)(x))[5] << 40) | \ ((uint64_t)((const uint8_t*)(x))[4] << 32) | \ ((uint64_t)((const uint8_t*)(x))[3] << 24) | \ ((uint64_t)((const uint8_t*)(x))[2] << 16) | \ ((uint64_t)((const uint8_t*)(x))[1] << 8) | \ (uint64_t)((const uint8_t*)(x))[0]) #endif #ifndef AV_WL64 # define AV_WL64(p, val) do { \ uint64_t d = (val); \ ((uint8_t*)(p))[0] = (d); \ ((uint8_t*)(p))[1] = (d)>>8; \ ((uint8_t*)(p))[2] = (d)>>16; \ ((uint8_t*)(p))[3] = (d)>>24; \ ((uint8_t*)(p))[4] = (d)>>32; \ ((uint8_t*)(p))[5] = (d)>>40; \ ((uint8_t*)(p))[6] = (d)>>48; \ ((uint8_t*)(p))[7] = (d)>>56; \ } while(0) #endif #if AV_HAVE_BIGENDIAN # define AV_RN(s, p) AV_RB##s(p) # define AV_WN(s, p, v) AV_WB##s(p, v) #else # define AV_RN(s, p) AV_RL##s(p) # define AV_WN(s, p, v) AV_WL##s(p, v) #endif #endif /* HAVE_FAST_UNALIGNED */ #ifndef AV_RN16 # define AV_RN16(p) AV_RN(16, p) #endif #ifndef AV_RN32 # define AV_RN32(p) AV_RN(32, p) #endif #ifndef AV_RN64 # define AV_RN64(p) AV_RN(64, p) #endif #ifndef AV_WN16 # define AV_WN16(p, v) AV_WN(16, p, v) #endif #ifndef AV_WN32 # define AV_WN32(p, v) AV_WN(32, p, v) #endif #ifndef AV_WN64 # define AV_WN64(p, v) AV_WN(64, p, v) #endif #if AV_HAVE_BIGENDIAN # define AV_RB(s, p) AV_RN##s(p) # define AV_WB(s, p, v) AV_WN##s(p, v) # define AV_RL(s, p) av_bswap##s(AV_RN##s(p)) # define AV_WL(s, p, v) AV_WN##s(p, av_bswap##s(v)) #else # define AV_RB(s, p) av_bswap##s(AV_RN##s(p)) # define AV_WB(s, p, v) AV_WN##s(p, av_bswap##s(v)) # define AV_RL(s, p) AV_RN##s(p) # define AV_WL(s, p, v) AV_WN##s(p, v) #endif #define AV_RB8(x) (((const uint8_t*)(x))[0]) #define AV_WB8(p, d) do { ((uint8_t*)(p))[0] = (d); } while(0) #define AV_RL8(x) AV_RB8(x) #define AV_WL8(p, d) AV_WB8(p, d) #ifndef AV_RB16 # define AV_RB16(p) AV_RB(16, p) #endif #ifndef AV_WB16 # define AV_WB16(p, v) AV_WB(16, p, v) #endif #ifndef AV_RL16 # define AV_RL16(p) AV_RL(16, p) #endif #ifndef AV_WL16 # define AV_WL16(p, v) AV_WL(16, p, v) #endif #ifndef AV_RB32 # define AV_RB32(p) AV_RB(32, p) #endif #ifndef AV_WB32 # define AV_WB32(p, v) AV_WB(32, p, v) #endif #ifndef AV_RL32 # define AV_RL32(p) AV_RL(32, p) #endif #ifndef AV_WL32 # define AV_WL32(p, v) AV_WL(32, p, v) #endif #ifndef AV_RB64 # define AV_RB64(p) AV_RB(64, p) #endif #ifndef AV_WB64 # define AV_WB64(p, v) AV_WB(64, p, v) #endif #ifndef AV_RL64 # define AV_RL64(p) AV_RL(64, p) #endif #ifndef AV_WL64 # define AV_WL64(p, v) AV_WL(64, p, v) #endif #ifndef AV_RB24 # define AV_RB24(x) \ ((((const uint8_t*)(x))[0] << 16) | \ (((const uint8_t*)(x))[1] << 8) | \ ((const uint8_t*)(x))[2]) #endif #ifndef AV_WB24 # define AV_WB24(p, d) do { \ ((uint8_t*)(p))[2] = (d); \ ((uint8_t*)(p))[1] = (d)>>8; \ ((uint8_t*)(p))[0] = (d)>>16; \ } while(0) #endif #ifndef AV_RL24 # define AV_RL24(x) \ ((((const uint8_t*)(x))[2] << 16) | \ (((const uint8_t*)(x))[1] << 8) | \ ((const uint8_t*)(x))[0]) #endif #ifndef AV_WL24 # define AV_WL24(p, d) do { \ ((uint8_t*)(p))[0] = (d); \ ((uint8_t*)(p))[1] = (d)>>8; \ ((uint8_t*)(p))[2] = (d)>>16; \ } while(0) #endif #ifndef AV_RB48 # define AV_RB48(x) \ (((uint64_t)((const uint8_t*)(x))[0] << 40) | \ ((uint64_t)((const uint8_t*)(x))[1] << 32) | \ ((uint64_t)((const uint8_t*)(x))[2] << 24) | \ ((uint64_t)((const uint8_t*)(x))[3] << 16) | \ ((uint64_t)((const uint8_t*)(x))[4] << 8) | \ (uint64_t)((const uint8_t*)(x))[5]) #endif #ifndef AV_WB48 # define AV_WB48(p, darg) do { \ uint64_t d = (darg); \ ((uint8_t*)(p))[5] = (d); \ ((uint8_t*)(p))[4] = (d)>>8; \ ((uint8_t*)(p))[3] = (d)>>16; \ ((uint8_t*)(p))[2] = (d)>>24; \ ((uint8_t*)(p))[1] = (d)>>32; \ ((uint8_t*)(p))[0] = (d)>>40; \ } while(0) #endif #ifndef AV_RL48 # define AV_RL48(x) \ (((uint64_t)((const uint8_t*)(x))[5] << 40) | \ ((uint64_t)((const uint8_t*)(x))[4] << 32) | \ ((uint64_t)((const uint8_t*)(x))[3] << 24) | \ ((uint64_t)((const uint8_t*)(x))[2] << 16) | \ ((uint64_t)((const uint8_t*)(x))[1] << 8) | \ (uint64_t)((const uint8_t*)(x))[0]) #endif #ifndef AV_WL48 # define AV_WL48(p, darg) do { \ uint64_t d = (darg); \ ((uint8_t*)(p))[0] = (d); \ ((uint8_t*)(p))[1] = (d)>>8; \ ((uint8_t*)(p))[2] = (d)>>16; \ ((uint8_t*)(p))[3] = (d)>>24; \ ((uint8_t*)(p))[4] = (d)>>32; \ ((uint8_t*)(p))[5] = (d)>>40; \ } while(0) #endif /* * The AV_[RW]NA macros access naturally aligned data * in a type-safe way. */ #define AV_RNA(s, p) (((const av_alias##s*)(p))->u##s) #define AV_WNA(s, p, v) (((av_alias##s*)(p))->u##s = (v)) #ifndef AV_RN16A # define AV_RN16A(p) AV_RNA(16, p) #endif #ifndef AV_RN32A # define AV_RN32A(p) AV_RNA(32, p) #endif #ifndef AV_RN64A # define AV_RN64A(p) AV_RNA(64, p) #endif #ifndef AV_WN16A # define AV_WN16A(p, v) AV_WNA(16, p, v) #endif #ifndef AV_WN32A # define AV_WN32A(p, v) AV_WNA(32, p, v) #endif #ifndef AV_WN64A # define AV_WN64A(p, v) AV_WNA(64, p, v) #endif #if AV_HAVE_BIGENDIAN # define AV_RLA(s, p) av_bswap##s(AV_RN##s##A(p)) # define AV_WLA(s, p, v) AV_WN##s##A(p, av_bswap##s(v)) #else # define AV_RLA(s, p) AV_RN##s##A(p) # define AV_WLA(s, p, v) AV_WN##s##A(p, v) #endif #ifndef AV_RL64A # define AV_RL64A(p) AV_RLA(64, p) #endif #ifndef AV_WL64A # define AV_WL64A(p, v) AV_WLA(64, p, v) #endif /* * The AV_COPYxxU macros are suitable for copying data to/from unaligned * memory locations. */ #define AV_COPYU(n, d, s) AV_WN##n(d, AV_RN##n(s)); #ifndef AV_COPY16U # define AV_COPY16U(d, s) AV_COPYU(16, d, s) #endif #ifndef AV_COPY32U # define AV_COPY32U(d, s) AV_COPYU(32, d, s) #endif #ifndef AV_COPY64U # define AV_COPY64U(d, s) AV_COPYU(64, d, s) #endif #ifndef AV_COPY128U # define AV_COPY128U(d, s) \ do { \ AV_COPY64U(d, s); \ AV_COPY64U((char *)(d) + 8, (const char *)(s) + 8); \ } while(0) #endif /* Parameters for AV_COPY*, AV_SWAP*, AV_ZERO* must be * naturally aligned. They may be implemented using MMX, * so emms_c() must be called before using any float code * afterwards. */ #define AV_COPY(n, d, s) \ (((av_alias##n*)(d))->u##n = ((const av_alias##n*)(s))->u##n) #ifndef AV_COPY16 # define AV_COPY16(d, s) AV_COPY(16, d, s) #endif #ifndef AV_COPY32 # define AV_COPY32(d, s) AV_COPY(32, d, s) #endif #ifndef AV_COPY64 # define AV_COPY64(d, s) AV_COPY(64, d, s) #endif #ifndef AV_COPY128 # define AV_COPY128(d, s) \ do { \ AV_COPY64(d, s); \ AV_COPY64((char*)(d)+8, (char*)(s)+8); \ } while(0) #endif #define AV_SWAP(n, a, b) FFSWAP(av_alias##n, *(av_alias##n*)(a), *(av_alias##n*)(b)) #ifndef AV_SWAP64 # define AV_SWAP64(a, b) AV_SWAP(64, a, b) #endif #define AV_ZERO(n, d) (((av_alias##n*)(d))->u##n = 0) #ifndef AV_ZERO16 # define AV_ZERO16(d) AV_ZERO(16, d) #endif #ifndef AV_ZERO32 # define AV_ZERO32(d) AV_ZERO(32, d) #endif #ifndef AV_ZERO64 # define AV_ZERO64(d) AV_ZERO(64, d) #endif #ifndef AV_ZERO128 # define AV_ZERO128(d) \ do { \ AV_ZERO64(d); \ AV_ZERO64((char*)(d)+8); \ } while(0) #endif #endif /* AVUTIL_INTREADWRITE_H */