99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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* Copyright (C) 2009 VMware, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file compiler.h
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* Compiler-related stuff.
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*/
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#ifndef COMPILER_H
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#define COMPILER_H
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#include <assert.h>
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#include "util/macros.h"
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/**
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* Either define MESA_BIG_ENDIAN or MESA_LITTLE_ENDIAN, and CPU_TO_LE32.
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* Do not use these unless absolutely necessary!
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* Try to use a runtime test instead.
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* For now, only used by some DRI hardware drivers for color/texel packing.
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*/
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#if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
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#if defined(__linux__)
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#include <byteswap.h>
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#define CPU_TO_LE32( x ) bswap_32( x )
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#elif defined(__APPLE__)
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#include <CoreFoundation/CFByteOrder.h>
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#define CPU_TO_LE32( x ) CFSwapInt32HostToLittle( x )
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#elif defined(__OpenBSD__)
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#include <sys/types.h>
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#define CPU_TO_LE32( x ) htole32( x )
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#else /*__linux__ */
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#include <sys/endian.h>
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#define CPU_TO_LE32( x ) bswap32( x )
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#endif /*__linux__*/
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#define MESA_BIG_ENDIAN 1
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#else
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#define CPU_TO_LE32( x ) ( x )
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#define MESA_LITTLE_ENDIAN 1
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#endif
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#define LE32_TO_CPU( x ) CPU_TO_LE32( x )
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#define IEEE_ONE 0x3f800000
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#ifndef __has_attribute
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# define __has_attribute(x) 0
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#endif
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#if defined(__has_cpp_attribute) && defined(__clang__)
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/* We do not do the same trick as __has_attribute because parsing
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* clang::fallthrough in the preprocessor fails in GCC. */
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# define HAS_CLANG_FALLTHROUGH __has_cpp_attribute(clang::fallthrough)
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#else
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# define HAS_CLANG_FALLTHROUGH 0
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#endif
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#if __cplusplus >= 201703L || __STDC_VERSION__ > 201710L
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/* Standard C++17/C23 attribute */
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#define FALLTHROUGH [[fallthrough]]
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#elif HAS_CLANG_FALLTHROUGH
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/* Clang++ specific */
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#define FALLTHROUGH [[clang::fallthrough]]
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#elif __has_attribute(fallthrough)
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/* Non-standard but supported by at least gcc and clang */
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#define FALLTHROUGH __attribute__((fallthrough))
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#else
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#define FALLTHROUGH do { } while(0)
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#endif
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#endif /* COMPILER_H */
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