1 /* 2 * Mesa 3-D graphics library 3 * 4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. 5 * Copyright (C) 2009 VMware, Inc. All Rights Reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the "Software"), 9 * to deal in the Software without restriction, including without limitation 10 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 11 * and/or sell copies of the Software, and to permit persons to whom the 12 * Software is furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included 15 * in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 23 * OTHER DEALINGS IN THE SOFTWARE. 24 */ 25 26 27 /** 28 * \file compiler.h 29 * Compiler-related stuff. 30 */ 31 32 33 #ifndef COMPILER_H 34 #define COMPILER_H 35 36 37 #include <assert.h> 38 39 #include "util/macros.h" 40 41 42 /** 43 * Either define MESA_BIG_ENDIAN or MESA_LITTLE_ENDIAN, and CPU_TO_LE32. 44 * Do not use these unless absolutely necessary! 45 * Try to use a runtime test instead. 46 * For now, only used by some DRI hardware drivers for color/texel packing. 47 */ 48 #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN 49 #if defined(__linux__) 50 #include <byteswap.h> 51 #define CPU_TO_LE32( x ) bswap_32( x ) 52 #elif defined(__APPLE__) 53 #include <CoreFoundation/CFByteOrder.h> 54 #define CPU_TO_LE32( x ) CFSwapInt32HostToLittle( x ) 55 #elif defined(__OpenBSD__) 56 #include <sys/types.h> 57 #define CPU_TO_LE32( x ) htole32( x ) 58 #else /*__linux__ */ 59 #include <sys/endian.h> 60 #define CPU_TO_LE32( x ) bswap32( x ) 61 #endif /*__linux__*/ 62 #define MESA_BIG_ENDIAN 1 63 #else 64 #define CPU_TO_LE32( x ) ( x ) 65 #define MESA_LITTLE_ENDIAN 1 66 #endif 67 #define LE32_TO_CPU( x ) CPU_TO_LE32( x ) 68 69 70 71 #define IEEE_ONE 0x3f800000 72 73 #ifndef __has_attribute 74 # define __has_attribute(x) 0 75 #endif 76 77 #if defined(__has_cpp_attribute) && defined(__clang__) 78 /* We do not do the same trick as __has_attribute because parsing 79 * clang::fallthrough in the preprocessor fails in GCC. */ 80 # define HAS_CLANG_FALLTHROUGH __has_cpp_attribute(clang::fallthrough) 81 #else 82 # define HAS_CLANG_FALLTHROUGH 0 83 #endif 84 85 #if __cplusplus >= 201703L || __STDC_VERSION__ > 201710L 86 /* Standard C++17/C23 attribute */ 87 #define FALLTHROUGH [[fallthrough]] 88 #elif HAS_CLANG_FALLTHROUGH 89 /* Clang++ specific */ 90 #define FALLTHROUGH [[clang::fallthrough]] 91 #elif __has_attribute(fallthrough) 92 /* Non-standard but supported by at least gcc and clang */ 93 #define FALLTHROUGH __attribute__((fallthrough)) 94 #else 95 #define FALLTHROUGH do { } while(0) 96 #endif 97 98 #endif /* COMPILER_H */ 99