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