205 lines
7.2 KiB
C
205 lines
7.2 KiB
C
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/*
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Copyright Rene Rivera 2013-2015
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_PREDEF_ENDIAN_H
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#define BOOST_PREDEF_ENDIAN_H
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#include <boost/predef/version_number.h>
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#include <boost/predef/make.h>
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#include <boost/predef/library/c/gnu.h>
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#include <boost/predef/os/macos.h>
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#include <boost/predef/os/bsd.h>
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#include <boost/predef/os/android.h>
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/*`
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[heading `BOOST_ENDIAN_*`]
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Detection of endian memory ordering. There are four defined macros
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in this header that define the various generally possible endian
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memory orderings:
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* `BOOST_ENDIAN_BIG_BYTE`, byte-swapped big-endian.
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* `BOOST_ENDIAN_BIG_WORD`, word-swapped big-endian.
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* `BOOST_ENDIAN_LITTLE_BYTE`, byte-swapped little-endian.
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* `BOOST_ENDIAN_LITTLE_WORD`, word-swapped little-endian.
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The detection is conservative in that it only identifies endianness
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that it knows for certain. In particular bi-endianness is not
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indicated as is it not practically possible to determine the
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endianness from anything but an operating system provided
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header. And the currently known headers do not define that
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programatic bi-endianness is available.
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This implementation is a compilation of various publicly available
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information and acquired knowledge:
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# The indispensable documentation of "Pre-defined Compiler Macros"
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[@http://sourceforge.net/p/predef/wiki/Endianness Endianness].
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# The various endian specifications available in the
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[@http://wikipedia.org/ Wikipedia] computer architecture pages.
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# Generally available searches for headers that define endianness.
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*/
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#define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_NOT_AVAILABLE
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#define BOOST_ENDIAN_BIG_WORD BOOST_VERSION_NUMBER_NOT_AVAILABLE
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#define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_NOT_AVAILABLE
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#define BOOST_ENDIAN_LITTLE_WORD BOOST_VERSION_NUMBER_NOT_AVAILABLE
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/* GNU libc provides a header defining __BYTE_ORDER, or _BYTE_ORDER.
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* And some OSs provide some for of endian header also.
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*/
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#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
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!BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
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# if BOOST_LIB_C_GNU || BOOST_OS_ANDROID
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# include <endian.h>
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# else
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# if BOOST_OS_MACOS
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# include <machine/endian.h>
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# else
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# if BOOST_OS_BSD
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# if BOOST_OS_BSD_OPEN
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# include <machine/endian.h>
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# else
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# include <sys/endian.h>
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# endif
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# endif
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# endif
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# endif
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# if defined(__BYTE_ORDER)
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# if defined(__BIG_ENDIAN) && (__BYTE_ORDER == __BIG_ENDIAN)
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# undef BOOST_ENDIAN_BIG_BYTE
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# define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
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# endif
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# if defined(__LITTLE_ENDIAN) && (__BYTE_ORDER == __LITTLE_ENDIAN)
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# undef BOOST_ENDIAN_LITTLE_BYTE
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# define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
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# endif
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# if defined(__PDP_ENDIAN) && (__BYTE_ORDER == __PDP_ENDIAN)
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# undef BOOST_ENDIAN_LITTLE_WORD
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# define BOOST_ENDIAN_LITTLE_WORD BOOST_VERSION_NUMBER_AVAILABLE
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# endif
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# endif
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# if !defined(__BYTE_ORDER) && defined(_BYTE_ORDER)
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# if defined(_BIG_ENDIAN) && (_BYTE_ORDER == _BIG_ENDIAN)
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# undef BOOST_ENDIAN_BIG_BYTE
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# define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
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# endif
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# if defined(_LITTLE_ENDIAN) && (_BYTE_ORDER == _LITTLE_ENDIAN)
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# undef BOOST_ENDIAN_LITTLE_BYTE
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# define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
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# endif
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# if defined(_PDP_ENDIAN) && (_BYTE_ORDER == _PDP_ENDIAN)
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# undef BOOST_ENDIAN_LITTLE_WORD
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# define BOOST_ENDIAN_LITTLE_WORD BOOST_VERSION_NUMBER_AVAILABLE
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# endif
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# endif
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#endif
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/* Built-in byte-swpped big-endian macros.
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*/
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#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
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!BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
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# if (defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)) || \
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(defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN)) || \
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defined(__ARMEB__) || \
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defined(__THUMBEB__) || \
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defined(__AARCH64EB__) || \
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defined(_MIPSEB) || \
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defined(__MIPSEB) || \
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defined(__MIPSEB__)
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# undef BOOST_ENDIAN_BIG_BYTE
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# define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
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# endif
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#endif
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/* Built-in byte-swpped little-endian macros.
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*/
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#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
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!BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
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# if (defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)) || \
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(defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)) || \
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defined(__ARMEL__) || \
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defined(__THUMBEL__) || \
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defined(__AARCH64EL__) || \
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defined(_MIPSEL) || \
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defined(__MIPSEL) || \
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defined(__MIPSEL__)
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# undef BOOST_ENDIAN_LITTLE_BYTE
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# define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
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# endif
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#endif
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/* Some architectures are strictly one endianess (as opposed
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* the current common bi-endianess).
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*/
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#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
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!BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
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# include <boost/predef/architecture.h>
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# if BOOST_ARCH_M68K || \
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BOOST_ARCH_PARISC || \
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BOOST_ARCH_SPARC || \
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BOOST_ARCH_SYS370 || \
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BOOST_ARCH_SYS390 || \
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BOOST_ARCH_Z
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# undef BOOST_ENDIAN_BIG_BYTE
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# define BOOST_ENDIAN_BIG_BYTE BOOST_VERSION_NUMBER_AVAILABLE
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# endif
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# if BOOST_ARCH_AMD64 || \
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BOOST_ARCH_IA64 || \
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BOOST_ARCH_X86 || \
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BOOST_ARCH_BLACKFIN
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# undef BOOST_ENDIAN_LITTLE_BYTE
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# define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
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# endif
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#endif
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/* Windows on ARM, if not otherwise detected/specified, is always
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* byte-swaped little-endian.
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*/
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#if !BOOST_ENDIAN_BIG_BYTE && !BOOST_ENDIAN_BIG_WORD && \
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!BOOST_ENDIAN_LITTLE_BYTE && !BOOST_ENDIAN_LITTLE_WORD
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# if BOOST_ARCH_ARM
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# include <boost/predef/os/windows.h>
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# if BOOST_OS_WINDOWS
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# undef BOOST_ENDIAN_LITTLE_BYTE
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# define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
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# endif
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# endif
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#endif
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#if BOOST_ENDIAN_BIG_BYTE
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# define BOOST_ENDIAN_BIG_BYTE_AVAILABLE
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#endif
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#if BOOST_ENDIAN_BIG_WORD
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# define BOOST_ENDIAN_BIG_WORD_BYTE_AVAILABLE
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#endif
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#if BOOST_ENDIAN_LITTLE_BYTE
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# define BOOST_ENDIAN_LITTLE_BYTE_AVAILABLE
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#endif
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#if BOOST_ENDIAN_LITTLE_WORD
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# define BOOST_ENDIAN_LITTLE_WORD_BYTE_AVAILABLE
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#endif
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#define BOOST_ENDIAN_BIG_BYTE_NAME "Byte-Swapped Big-Endian"
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#define BOOST_ENDIAN_BIG_WORD_NAME "Word-Swapped Big-Endian"
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#define BOOST_ENDIAN_LITTLE_BYTE_NAME "Byte-Swapped Little-Endian"
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#define BOOST_ENDIAN_LITTLE_WORD_NAME "Word-Swapped Little-Endian"
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#endif
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#include <boost/predef/detail/test.h>
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BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_BIG_BYTE,BOOST_ENDIAN_BIG_BYTE_NAME)
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#include <boost/predef/detail/test.h>
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BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_BIG_WORD,BOOST_ENDIAN_BIG_WORD_NAME)
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#include <boost/predef/detail/test.h>
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BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_LITTLE_BYTE,BOOST_ENDIAN_LITTLE_BYTE_NAME)
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#include <boost/predef/detail/test.h>
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BOOST_PREDEF_DECLARE_TEST(BOOST_ENDIAN_LITTLE_WORD,BOOST_ENDIAN_LITTLE_WORD_NAME)
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