1 /* 2 * Copyright (C) 2011, 2012 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef WTF_Compiler_h 27 #define WTF_Compiler_h 28 29 /* COMPILER() - the compiler being used to build the project */ 30 #define COMPILER(WTF_FEATURE) (defined WTF_COMPILER_##WTF_FEATURE && WTF_COMPILER_##WTF_FEATURE) 31 32 /* COMPILER_SUPPORTS() - whether the compiler being used to build the project supports the given feature. */ 33 #define COMPILER_SUPPORTS(WTF_COMPILER_FEATURE) (defined WTF_COMPILER_SUPPORTS_##WTF_COMPILER_FEATURE && WTF_COMPILER_SUPPORTS_##WTF_COMPILER_FEATURE) 34 35 /* COMPILER_QUIRK() - whether the compiler being used to build the project requires a given quirk. */ 36 #define COMPILER_QUIRK(WTF_COMPILER_QUIRK) (defined WTF_COMPILER_QUIRK_##WTF_COMPILER_QUIRK && WTF_COMPILER_QUIRK_##WTF_COMPILER_QUIRK) 37 38 /* ==== COMPILER() - the compiler being used to build the project ==== */ 39 40 /* COMPILER(CLANG) - Clang */ 41 #if defined(__clang__) 42 #define WTF_COMPILER_CLANG 1 43 44 #define CLANG_PRAGMA(PRAGMA) _Pragma(PRAGMA) 45 46 /* Specific compiler features */ 47 #define WTF_COMPILER_SUPPORTS_CXX_VARIADIC_TEMPLATES __has_extension(cxx_variadic_templates) 48 49 /* There is a bug in clang that comes with Xcode 4.2 where AtomicStrings can't be implicitly converted to Strings 50 in the presence of move constructors and/or move assignment operators. This bug has been fixed in Xcode 4.3 clang, so we 51 check for both cxx_rvalue_references as well as the unrelated cxx_nonstatic_member_init feature which we know was added in 4.3 */ 52 #define WTF_COMPILER_SUPPORTS_CXX_RVALUE_REFERENCES __has_extension(cxx_rvalue_references) && __has_extension(cxx_nonstatic_member_init) 53 54 #define WTF_COMPILER_SUPPORTS_CXX_DELETED_FUNCTIONS __has_extension(cxx_deleted_functions) 55 #define WTF_COMPILER_SUPPORTS_CXX_NULLPTR __has_feature(cxx_nullptr) 56 #define WTF_COMPILER_SUPPORTS_CXX_EXPLICIT_CONVERSIONS __has_feature(cxx_explicit_conversions) 57 #define WTF_COMPILER_SUPPORTS_BLOCKS __has_feature(blocks) 58 #define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT __has_extension(c_static_assert) 59 #define WTF_COMPILER_SUPPORTS_CXX_STATIC_ASSERT __has_extension(cxx_static_assert) 60 #define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL __has_extension(cxx_override_control) 61 #define WTF_COMPILER_SUPPORTS_HAS_TRIVIAL_DESTRUCTOR __has_extension(has_trivial_destructor) 62 #define WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS __has_extension(cxx_strong_enums) 63 64 #endif 65 66 #ifndef CLANG_PRAGMA 67 #define CLANG_PRAGMA(PRAGMA) 68 #endif 69 70 /* COMPILER(MSVC) - Microsoft Visual C++ */ 71 #if defined(_MSC_VER) 72 #define WTF_COMPILER_MSVC 1 73 74 /* Specific compiler features */ 75 #if !COMPILER(CLANG) && _MSC_VER >= 1600 76 #define WTF_COMPILER_SUPPORTS_CXX_NULLPTR 1 77 #endif 78 79 #if !COMPILER(CLANG) 80 #define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL 1 81 #define WTF_COMPILER_QUIRK_FINAL_IS_CALLED_SEALED 1 82 #endif 83 84 #endif 85 86 /* COMPILER(GCC) - GNU Compiler Collection */ 87 #if defined(__GNUC__) 88 #define WTF_COMPILER_GCC 1 89 #define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) 90 #define GCC_VERSION_AT_LEAST(major, minor, patch) (GCC_VERSION >= (major * 10000 + minor * 100 + patch)) 91 #else 92 /* Define this for !GCC compilers, just so we can write things like GCC_VERSION_AT_LEAST(4, 1, 0). */ 93 #define GCC_VERSION_AT_LEAST(major, minor, patch) 0 94 #endif 95 96 /* Specific compiler features */ 97 #if COMPILER(GCC) && !COMPILER(CLANG) 98 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L 99 /* C11 support */ 100 #define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT 1 101 #endif 102 #if defined(__GXX_EXPERIMENTAL_CXX0X__) || (defined(__cplusplus) && __cplusplus >= 201103L) 103 /* C++11 support */ 104 #if GCC_VERSION_AT_LEAST(4, 3, 0) 105 #define WTF_COMPILER_SUPPORTS_CXX_RVALUE_REFERENCES 1 106 #define WTF_COMPILER_SUPPORTS_CXX_STATIC_ASSERT 1 107 #define WTF_COMPILER_SUPPORTS_CXX_VARIADIC_TEMPLATES 1 108 #endif 109 #if GCC_VERSION_AT_LEAST(4, 4, 0) 110 #define WTF_COMPILER_SUPPORTS_CXX_DELETED_FUNCTIONS 1 111 #endif 112 #if GCC_VERSION_AT_LEAST(4, 5, 0) 113 #define WTF_COMPILER_SUPPORTS_CXX_EXPLICIT_CONVERSIONS 1 114 #endif 115 #if GCC_VERSION_AT_LEAST(4, 6, 0) 116 #define WTF_COMPILER_SUPPORTS_CXX_NULLPTR 1 117 /* Strong enums should work from gcc 4.4, but doesn't seem to support some operators */ 118 #define WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS 1 119 #endif 120 #if GCC_VERSION_AT_LEAST(4, 7, 0) 121 #define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL 1 122 #endif 123 #endif /* defined(__GXX_EXPERIMENTAL_CXX0X__) || (defined(__cplusplus) && __cplusplus >= 201103L) */ 124 #endif /* COMPILER(GCC) */ 125 126 /* ==== Compiler features ==== */ 127 128 129 /* ALWAYS_INLINE */ 130 131 #ifndef ALWAYS_INLINE 132 #if COMPILER(GCC) && defined(NDEBUG) && !COMPILER(MINGW) 133 #define ALWAYS_INLINE inline __attribute__((__always_inline__)) 134 #elif COMPILER(MSVC) && defined(NDEBUG) 135 #define ALWAYS_INLINE __forceinline 136 #else 137 #define ALWAYS_INLINE inline 138 #endif 139 #endif 140 141 142 /* NEVER_INLINE */ 143 144 #ifndef NEVER_INLINE 145 #if COMPILER(GCC) 146 #define NEVER_INLINE __attribute__((__noinline__)) 147 #else 148 #define NEVER_INLINE 149 #endif 150 #endif 151 152 153 /* UNLIKELY */ 154 155 #ifndef UNLIKELY 156 #if COMPILER(GCC) 157 #define UNLIKELY(x) __builtin_expect((x), 0) 158 #else 159 #define UNLIKELY(x) (x) 160 #endif 161 #endif 162 163 164 /* LIKELY */ 165 166 #ifndef LIKELY 167 #if COMPILER(GCC) 168 #define LIKELY(x) __builtin_expect((x), 1) 169 #else 170 #define LIKELY(x) (x) 171 #endif 172 #endif 173 174 175 /* NO_RETURN */ 176 177 178 #ifndef NO_RETURN 179 #if COMPILER(GCC) 180 #define NO_RETURN __attribute((__noreturn__)) 181 #elif COMPILER(MSVC) 182 #define NO_RETURN __declspec(noreturn) 183 #else 184 #define NO_RETURN 185 #endif 186 #endif 187 188 189 /* NO_RETURN_WITH_VALUE */ 190 191 #ifndef NO_RETURN_WITH_VALUE 192 #if !COMPILER(MSVC) 193 #define NO_RETURN_WITH_VALUE NO_RETURN 194 #else 195 #define NO_RETURN_WITH_VALUE 196 #endif 197 #endif 198 199 200 /* WARN_UNUSED_RETURN */ 201 202 #if COMPILER(GCC) 203 #define WARN_UNUSED_RETURN __attribute__ ((warn_unused_result)) 204 #else 205 #define WARN_UNUSED_RETURN 206 #endif 207 208 /* OVERRIDE and FINAL */ 209 210 #if COMPILER_SUPPORTS(CXX_OVERRIDE_CONTROL) 211 #define OVERRIDE override 212 213 #if COMPILER_QUIRK(FINAL_IS_CALLED_SEALED) 214 #define FINAL sealed 215 #else 216 #define FINAL final 217 #endif 218 219 #else 220 #define OVERRIDE 221 #define FINAL 222 #endif 223 224 /* REFERENCED_FROM_ASM */ 225 226 #ifndef REFERENCED_FROM_ASM 227 #if COMPILER(GCC) 228 #define REFERENCED_FROM_ASM __attribute__((used)) 229 #else 230 #define REFERENCED_FROM_ASM 231 #endif 232 #endif 233 234 /* OBJC_CLASS */ 235 236 #ifndef OBJC_CLASS 237 #ifdef __OBJC__ 238 #define OBJC_CLASS @class 239 #else 240 #define OBJC_CLASS class 241 #endif 242 #endif 243 244 /* ABI */ 245 #if defined(__ARM_EABI__) || defined(__EABI__) 246 #define WTF_COMPILER_SUPPORTS_EABI 1 247 #endif 248 249 #endif /* WTF_Compiler_h */ 250
