1 /* Copyright 2016 Google Inc. All Rights Reserved. 2 3 Distributed under MIT license. 4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT 5 */ 6 7 /* Macros for compiler / platform specific features and build options. */ 8 9 #ifndef BROTLI_COMMON_PORT_H_ 10 #define BROTLI_COMMON_PORT_H_ 11 12 /* Compatibility with non-clang compilers. */ 13 #ifndef __has_builtin 14 #define __has_builtin(x) 0 15 #endif 16 17 #ifndef __has_attribute 18 #define __has_attribute(x) 0 19 #endif 20 21 #ifndef __has_feature 22 #define __has_feature(x) 0 23 #endif 24 25 #if defined(__GNUC__) && defined(__GNUC_MINOR__) 26 #define BROTLI_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__) 27 #else 28 #define BROTLI_GCC_VERSION 0 29 #endif 30 31 #if defined(__ICC) 32 #define BROTLI_ICC_VERSION __ICC 33 #else 34 #define BROTLI_ICC_VERSION 0 35 #endif 36 37 #if defined(BROTLI_BUILD_MODERN_COMPILER) 38 #define BROTLI_MODERN_COMPILER 1 39 #elif BROTLI_GCC_VERSION >= 304 || BROTLI_ICC_VERSION >= 1600 40 #define BROTLI_MODERN_COMPILER 1 41 #else 42 #define BROTLI_MODERN_COMPILER 0 43 #endif 44 45 /* Define "BROTLI_PREDICT_TRUE" and "BROTLI_PREDICT_FALSE" macros for capable 46 compilers. 47 48 To apply compiler hint, enclose the branching condition into macros, like this: 49 50 if (BROTLI_PREDICT_TRUE(zero == 0)) { 51 // main execution path 52 } else { 53 // compiler should place this code outside of main execution path 54 } 55 56 OR: 57 58 if (BROTLI_PREDICT_FALSE(something_rare_or_unexpected_happens)) { 59 // compiler should place this code outside of main execution path 60 } 61 62 */ 63 #if BROTLI_MODERN_COMPILER || __has_builtin(__builtin_expect) 64 #define BROTLI_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1)) 65 #define BROTLI_PREDICT_FALSE(x) (__builtin_expect(x, 0)) 66 #else 67 #define BROTLI_PREDICT_FALSE(x) (x) 68 #define BROTLI_PREDICT_TRUE(x) (x) 69 #endif 70 71 #if BROTLI_MODERN_COMPILER || __has_attribute(always_inline) 72 #define BROTLI_ATTRIBUTE_ALWAYS_INLINE __attribute__ ((always_inline)) 73 #else 74 #define BROTLI_ATTRIBUTE_ALWAYS_INLINE 75 #endif 76 77 #if defined(_WIN32) || defined(__CYGWIN__) 78 #define BROTLI_ATTRIBUTE_VISIBILITY_HIDDEN 79 #elif BROTLI_MODERN_COMPILER || __has_attribute(visibility) 80 #define BROTLI_ATTRIBUTE_VISIBILITY_HIDDEN \ 81 __attribute__ ((visibility ("hidden"))) 82 #else 83 #define BROTLI_ATTRIBUTE_VISIBILITY_HIDDEN 84 #endif 85 86 #ifndef BROTLI_INTERNAL 87 #define BROTLI_INTERNAL BROTLI_ATTRIBUTE_VISIBILITY_HIDDEN 88 #endif 89 90 #if defined(BROTLI_SHARED_COMPILATION) && defined(_WIN32) 91 #if defined(BROTLICOMMON_SHARED_COMPILATION) 92 #define BROTLI_COMMON_API __declspec(dllexport) 93 #else 94 #define BROTLI_COMMON_API __declspec(dllimport) 95 #endif /* BROTLICOMMON_SHARED_COMPILATION */ 96 #if defined(BROTLIDEC_SHARED_COMPILATION) 97 #define BROTLI_DEC_API __declspec(dllexport) 98 #else 99 #define BROTLI_DEC_API __declspec(dllimport) 100 #endif /* BROTLIDEC_SHARED_COMPILATION */ 101 #if defined(BROTLIENC_SHARED_COMPILATION) 102 #define BROTLI_ENC_API __declspec(dllexport) 103 #else 104 #define BROTLI_ENC_API __declspec(dllimport) 105 #endif /* BROTLIENC_SHARED_COMPILATION */ 106 #else /* BROTLI_SHARED_COMPILATION && _WIN32 */ 107 #define BROTLI_COMMON_API 108 #define BROTLI_DEC_API 109 #define BROTLI_ENC_API 110 #endif 111 112 #ifndef _MSC_VER 113 #if defined(__cplusplus) || !defined(__STRICT_ANSI__) || \ 114 (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) 115 #define BROTLI_INLINE inline BROTLI_ATTRIBUTE_ALWAYS_INLINE 116 #else 117 #define BROTLI_INLINE 118 #endif 119 #else /* _MSC_VER */ 120 #define BROTLI_INLINE __forceinline 121 #endif /* _MSC_VER */ 122 123 #if !defined(__cplusplus) && !defined(c_plusplus) && \ 124 (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) 125 #define BROTLI_RESTRICT restrict 126 #elif BROTLI_GCC_VERSION > 295 || defined(__llvm__) 127 #define BROTLI_RESTRICT __restrict 128 #else 129 #define BROTLI_RESTRICT 130 #endif 131 132 #if BROTLI_MODERN_COMPILER || __has_attribute(noinline) 133 #define BROTLI_NOINLINE __attribute__((noinline)) 134 #else 135 #define BROTLI_NOINLINE 136 #endif 137 138 #if BROTLI_MODERN_COMPILER || __has_attribute(deprecated) 139 #define BROTLI_DEPRECATED __attribute__((deprecated)) 140 #else 141 #define BROTLI_DEPRECATED 142 #endif 143 144 #define BROTLI_UNUSED(X) (void)(X) 145 146 #endif /* BROTLI_COMMON_PORT_H_ */ 147
