src/libcompiler_builtins/compiler-rt/lib/builtins/int_endianness.h

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