1 //===-- int_endianness.h - configuration header for compiler-rt -----------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is a configuration header for compiler-rt. 10 // This file is not part of the interface of this library. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef INT_ENDIANNESS_H 15 #define INT_ENDIANNESS_H 16 17 #if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \ 18 defined(__ORDER_LITTLE_ENDIAN__) 19 20 // Clang and GCC provide built-in endianness definitions. 21 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ 22 #define _YUGA_LITTLE_ENDIAN 0 23 #define _YUGA_BIG_ENDIAN 1 24 #elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 25 #define _YUGA_LITTLE_ENDIAN 1 26 #define _YUGA_BIG_ENDIAN 0 27 #endif // __BYTE_ORDER__ 28 29 #else // Compilers other than Clang or GCC. 30 31 #if defined(__SVR4) && defined(__sun) 32 #include <sys/byteorder.h> 33 34 #if defined(_BIG_ENDIAN) 35 #define _YUGA_LITTLE_ENDIAN 0 36 #define _YUGA_BIG_ENDIAN 1 37 #elif defined(_LITTLE_ENDIAN) 38 #define _YUGA_LITTLE_ENDIAN 1 39 #define _YUGA_BIG_ENDIAN 0 40 #else // !_LITTLE_ENDIAN 41 #error "unknown endianness" 42 #endif // !_LITTLE_ENDIAN 43 44 #endif // Solaris and AuroraUX. 45 46 // .. 47 48 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || \ 49 defined(__minix) 50 #include <sys/endian.h> 51 52 #if _BYTE_ORDER == _BIG_ENDIAN 53 #define _YUGA_LITTLE_ENDIAN 0 54 #define _YUGA_BIG_ENDIAN 1 55 #elif _BYTE_ORDER == _LITTLE_ENDIAN 56 #define _YUGA_LITTLE_ENDIAN 1 57 #define _YUGA_BIG_ENDIAN 0 58 #endif // _BYTE_ORDER 59 60 #endif // *BSD 61 62 #if defined(__OpenBSD__) 63 #include <machine/endian.h> 64 65 #if _BYTE_ORDER == _BIG_ENDIAN 66 #define _YUGA_LITTLE_ENDIAN 0 67 #define _YUGA_BIG_ENDIAN 1 68 #elif _BYTE_ORDER == _LITTLE_ENDIAN 69 #define _YUGA_LITTLE_ENDIAN 1 70 #define _YUGA_BIG_ENDIAN 0 71 #endif // _BYTE_ORDER 72 73 #endif // OpenBSD 74 75 // .. 76 77 // Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the 78 // compiler (at least with GCC) 79 #if defined(__APPLE__) || defined(__ellcc__) 80 81 #ifdef __BIG_ENDIAN__ 82 #if __BIG_ENDIAN__ 83 #define _YUGA_LITTLE_ENDIAN 0 84 #define _YUGA_BIG_ENDIAN 1 85 #endif 86 #endif // __BIG_ENDIAN__ 87 88 #ifdef __LITTLE_ENDIAN__ 89 #if __LITTLE_ENDIAN__ 90 #define _YUGA_LITTLE_ENDIAN 1 91 #define _YUGA_BIG_ENDIAN 0 92 #endif 93 #endif // __LITTLE_ENDIAN__ 94 95 #endif // Mac OSX 96 97 // .. 98 99 #if defined(_WIN32) 100 101 #define _YUGA_LITTLE_ENDIAN 1 102 #define _YUGA_BIG_ENDIAN 0 103 104 #endif // Windows 105 106 #endif // Clang or GCC. 107 108 // . 109 110 #if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN) 111 #error Unable to determine endian 112 #endif // Check we found an endianness correctly. 113 114 #endif // INT_ENDIANNESS_H 115