1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
Copyright Rene Rivera 2013-2014
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_PREDEF_ENDIAN_H
#define BOOST_PREDEF_ENDIAN_H
#include <boost/predef/version_number.h>
#include <boost/predef/make.h>
#include <boost/predef/library/c/gnu.h>
#include <boost/predef/os/macos.h>
#include <boost/predef/os/bsd.h>
#include <boost/predef/os/android.h>
/*`
[heading `BOOST_ENDIAN_*`]
Detection of endian memory ordering. There are four defined macros
in this header that define the various generally possible endian
memory orderings:
* `BOOST_ENDIAN_BIG_BYTE`, byte-swapped big-endian.
* `BOOST_ENDIAN_BIG_WORD`, word-swapped big-endian.
* `BOOST_ENDIAN_LITTLE_BYTE`, byte-swapped little-endian.
* `BOOST_ENDIAN_LITTLE_WORD`, word-swapped little-endian.
The detection is conservative in that it only identifies endianness
that it knows for certain. In particular bi-endianness is not
indicated as is it not practically possible to determine the
endianness from anything but an operating system provided
header. And the currently known headers do not define that
programatic bi-endianness is available.
This implementation is a compilation of various publicly available
information and acquired knowledge:
# The indispensable documentation of "Pre-defined Compiler Macros"
[@http://sourceforge.net/p/predef/wiki/Endianness Endianness].
# The various endian specifications available in the
[@http://wikipedia.org/ Wikipedia] computer architecture pages.
# Generally available searches for headers that define endianness.
*/
#define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_NOT_AVAILABLE
#define BOOST_ENDIAN_BIG_WORD BOOST_VERSION_NUMBER_NOT_AVAILABLE
#define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_NOT_AVAILABLE
#define BOOST_ENDIAN_LITTLE_WORD BOOST_VERSION_NUMBER_NOT_AVAILABLE
/* GNU libc provides a header defining __BYTE_ORDER, or _BYTE_ORDER.
* And some OSs provide some for of endian header also.
*/
#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
!BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
# if BOOST_LIB_C_GNU || BOOST_OS_ANDROID
# include <endian.h>
# else
# if BOOST_OS_MACOS
# include <machine/endian.h>
# else
# if BOOST_OS_BSD
# if BOOST_OS_BSD_OPEN
# include <machine/endian.h>
# else
# include <sys/endian.h>
# endif
# endif
# endif
# endif
# if defined(__BYTE_ORDER)
# if defined(__BIG_ENDIAN) && (__BYTE_ORDER == __BIG_ENDIAN)
# undef BOOST_ENDIAN_BIG_BYTE
# define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
# endif
# if defined(__LITTLE_ENDIAN) && (__BYTE_ORDER == __LITTLE_ENDIAN)
# undef BOOST_ENDIAN_LITTLE_BYTE
# define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
# endif
# if defined(__PDP_ENDIAN) && (__BYTE_ORDER == __PDP_ENDIAN)
# undef BOOST_ENDIAN_LITTLE_WORD
# define BOOST_ENDIAN_LITTLE_WORD BOOST_VERSION_NUMBER_AVAILABLE
# endif
# endif
# if !defined(__BYTE_ORDER) && defined(_BYTE_ORDER)
# if defined(_BIG_ENDIAN) && (_BYTE_ORDER == _BIG_ENDIAN)
# undef BOOST_ENDIAN_BIG_BYTE
# define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
# endif
# if defined(_LITTLE_ENDIAN) && (_BYTE_ORDER == _LITTLE_ENDIAN)
# undef BOOST_ENDIAN_LITTLE_BYTE
# define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
# endif
# if defined(_PDP_ENDIAN) && (_BYTE_ORDER == _PDP_ENDIAN)
# undef BOOST_ENDIAN_LITTLE_WORD
# define BOOST_ENDIAN_LITTLE_WORD BOOST_VERSION_NUMBER_AVAILABLE
# endif
# endif
#endif
/* Built-in byte-swpped big-endian macros.
*/
#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
!BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
# if (defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)) || \
(defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN)) || \
defined(__ARMEB__) || \
defined(__THUMBEB__) || \
defined(__AARCH64EB__) || \
defined(_MIPSEB) || \
defined(__MIPSEB) || \
defined(__MIPSEB__)
# undef BOOST_ENDIAN_BIG_BYTE
# define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
# endif
#endif
/* Built-in byte-swpped little-endian macros.
*/
#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
!BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
# if (defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)) || \
(defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)) || \
defined(__ARMEL__) || \
defined(__THUMBEL__) || \
defined(__AARCH64EL__) || \
defined(_MIPSEL) || \
defined(__MIPSEL) || \
defined(__MIPSEL__)
# undef BOOST_ENDIAN_LITTLE_BYTE
# define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
# endif
#endif
/* Some architectures are strictly one endianess (as opposed
* the current common bi-endianess).
*/
#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
!BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
# include <boost/predef/architecture.h>
# if BOOST_ARCH_M68K || \
BOOST_ARCH_PARISK || \
BOOST_ARCH_SPARC || \
BOOST_ARCH_SYS370 || \
BOOST_ARCH_SYS390 || \
BOOST_ARCH_Z
# undef BOOST_ENDIAN_BIG_BYTE
# define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
# endif
# if BOOST_ARCH_AMD64 || \
BOOST_ARCH_IA64 || \
BOOST_ARCH_X86 || \
BOOST_ARCH_BLACKFIN
# undef BOOST_ENDIAN_LITTLE_BYTE
# define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
# endif
#endif
/* Windows on ARM, if not otherwise detected/specified, is always
* byte-swaped little-endian.
*/
#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
!BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
# if BOOST_ARCH_ARM
# include <boost/predef/os/windows.h>
# if BOOST_OS_WINDOWS
# undef BOOST_ENDIAN_LITTLE_BYTE
# define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
# endif
# endif
#endif
#if BOOST_ENDIAN_BIG_BYTE
# define BOOST_ENDIAN_BIG_BYTE_AVAILABLE
#endif
#if BOOST_ENDIAN_BIG_WORD
# define BOOST_ENDIAN_BIG_WORD_BYTE_AVAILABLE
#endif
#if BOOST_ENDIAN_LITTLE_BYTE
# define BOOST_ENDIAN_LITTLE_BYTE_AVAILABLE
#endif
#if BOOST_ENDIAN_LITTLE_WORD
# define BOOST_ENDIAN_LITTLE_WORD_BYTE_AVAILABLE
#endif
#define BOOST_ENDIAN_BIG_BYTE_NAME "Byte-Swapped Big-Endian"
#define BOOST_ENDIAN_BIG_WORD_NAME "Word-Swapped Big-Endian"
#define BOOST_ENDIAN_LITTLE_BYTE_NAME "Byte-Swapped Little-Endian"
#define BOOST_ENDIAN_LITTLE_WORD_NAME "Word-Swapped Little-Endian"
#include <boost/predef/detail/test.h>
BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_BIG_BYTE,BOOST_ENDIAN_BIG_BYTE_NAME)
#include <boost/predef/detail/test.h>
BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_BIG_WORD,BOOST_ENDIAN_BIG_WORD_NAME)
#include <boost/predef/detail/test.h>
BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_LITTLE_BYTE,BOOST_ENDIAN_LITTLE_BYTE_NAME)
#include <boost/predef/detail/test.h>
BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_LITTLE_WORD,BOOST_ENDIAN_LITTLE_WORD_NAME)
#endif
|
