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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 */
117