1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8CONFIG_H_ 6 #define V8CONFIG_H_ 7 8 // clang-format off 9 10 // Platform headers for feature detection below. 11 #if defined(__ANDROID__) 12 # include <sys/cdefs.h> 13 #elif defined(__APPLE__) 14 # include <TargetConditionals.h> 15 #elif defined(__linux__) 16 # include <features.h> 17 #endif 18 19 20 // This macro allows to test for the version of the GNU C library (or 21 // a compatible C library that masquerades as glibc). It evaluates to 22 // 0 if libc is not GNU libc or compatible. 23 // Use like: 24 // #if V8_GLIBC_PREREQ(2, 3) 25 // ... 26 // #endif 27 #if defined(__GLIBC__) && defined(__GLIBC_MINOR__) 28 # define V8_GLIBC_PREREQ(major, minor) \ 29 ((__GLIBC__ * 100 + __GLIBC_MINOR__) >= ((major) * 100 + (minor))) 30 #else 31 # define V8_GLIBC_PREREQ(major, minor) 0 32 #endif 33 34 35 // This macro allows to test for the version of the GNU C++ compiler. 36 // Note that this also applies to compilers that masquerade as GCC, 37 // for example clang and the Intel C++ compiler for Linux. 38 // Use like: 39 // #if V8_GNUC_PREREQ(4, 3, 1) 40 // ... 41 // #endif 42 #if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__) 43 # define V8_GNUC_PREREQ(major, minor, patchlevel) \ 44 ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= \ 45 ((major) * 10000 + (minor) * 100 + (patchlevel))) 46 #elif defined(__GNUC__) && defined(__GNUC_MINOR__) 47 # define V8_GNUC_PREREQ(major, minor, patchlevel) \ 48 ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100) >= \ 49 ((major) * 10000 + (minor) * 100 + (patchlevel))) 50 #else 51 # define V8_GNUC_PREREQ(major, minor, patchlevel) 0 52 #endif 53 54 55 56 // ----------------------------------------------------------------------------- 57 // Operating system detection 58 // 59 // V8_OS_ANDROID - Android 60 // V8_OS_BSD - BSDish (Mac OS X, Net/Free/Open/DragonFlyBSD) 61 // V8_OS_CYGWIN - Cygwin 62 // V8_OS_DRAGONFLYBSD - DragonFlyBSD 63 // V8_OS_FREEBSD - FreeBSD 64 // V8_OS_LINUX - Linux 65 // V8_OS_MACOSX - Mac OS X 66 // V8_OS_NACL - Native Client 67 // V8_OS_NETBSD - NetBSD 68 // V8_OS_OPENBSD - OpenBSD 69 // V8_OS_POSIX - POSIX compatible (mostly everything except Windows) 70 // V8_OS_QNX - QNX Neutrino 71 // V8_OS_SOLARIS - Sun Solaris and OpenSolaris 72 // V8_OS_AIX - AIX 73 // V8_OS_WIN - Microsoft Windows 74 75 #if defined(__ANDROID__) 76 # define V8_OS_ANDROID 1 77 # define V8_OS_LINUX 1 78 # define V8_OS_POSIX 1 79 #elif defined(__APPLE__) 80 # define V8_OS_BSD 1 81 # define V8_OS_MACOSX 1 82 # define V8_OS_POSIX 1 83 #elif defined(__native_client__) 84 # define V8_OS_NACL 1 85 # define V8_OS_POSIX 1 86 #elif defined(__CYGWIN__) 87 # define V8_OS_CYGWIN 1 88 # define V8_OS_POSIX 1 89 #elif defined(__linux__) 90 # define V8_OS_LINUX 1 91 # define V8_OS_POSIX 1 92 #elif defined(__sun) 93 # define V8_OS_POSIX 1 94 # define V8_OS_SOLARIS 1 95 #elif defined(_AIX) 96 #define V8_OS_POSIX 1 97 #define V8_OS_AIX 1 98 #elif defined(__FreeBSD__) 99 # define V8_OS_BSD 1 100 # define V8_OS_FREEBSD 1 101 # define V8_OS_POSIX 1 102 #elif defined(__DragonFly__) 103 # define V8_OS_BSD 1 104 # define V8_OS_DRAGONFLYBSD 1 105 # define V8_OS_POSIX 1 106 #elif defined(__NetBSD__) 107 # define V8_OS_BSD 1 108 # define V8_OS_NETBSD 1 109 # define V8_OS_POSIX 1 110 #elif defined(__OpenBSD__) 111 # define V8_OS_BSD 1 112 # define V8_OS_OPENBSD 1 113 # define V8_OS_POSIX 1 114 #elif defined(__QNXNTO__) 115 # define V8_OS_POSIX 1 116 # define V8_OS_QNX 1 117 #elif defined(_WIN32) 118 # define V8_OS_WIN 1 119 #endif 120 121 122 // ----------------------------------------------------------------------------- 123 // C library detection 124 // 125 // V8_LIBC_MSVCRT - MSVC libc 126 // V8_LIBC_BIONIC - Bionic libc 127 // V8_LIBC_BSD - BSD libc derivate 128 // V8_LIBC_GLIBC - GNU C library 129 // V8_LIBC_UCLIBC - uClibc 130 // 131 // Note that testing for libc must be done using #if not #ifdef. For example, 132 // to test for the GNU C library, use: 133 // #if V8_LIBC_GLIBC 134 // ... 135 // #endif 136 137 #if defined (_MSC_VER) 138 # define V8_LIBC_MSVCRT 1 139 #elif defined(__BIONIC__) 140 # define V8_LIBC_BIONIC 1 141 # define V8_LIBC_BSD 1 142 #elif defined(__UCLIBC__) 143 // Must test for UCLIBC before GLIBC, as UCLIBC pretends to be GLIBC. 144 # define V8_LIBC_UCLIBC 1 145 #elif defined(__GLIBC__) || defined(__GNU_LIBRARY__) 146 # define V8_LIBC_GLIBC 1 147 #else 148 # define V8_LIBC_BSD V8_OS_BSD 149 #endif 150 151 152 // ----------------------------------------------------------------------------- 153 // Compiler detection 154 // 155 // V8_CC_GNU - GCC, or clang in gcc mode 156 // V8_CC_INTEL - Intel C++ 157 // V8_CC_MINGW - Minimalist GNU for Windows 158 // V8_CC_MINGW32 - Minimalist GNU for Windows (mingw32) 159 // V8_CC_MINGW64 - Minimalist GNU for Windows (mingw-w64) 160 // V8_CC_MSVC - Microsoft Visual C/C++, or clang in cl.exe mode 161 // 162 // C++11 feature detection 163 // 164 // V8_HAS_CXX11_ALIGNAS - alignas specifier supported 165 // V8_HAS_CXX11_ALIGNOF - alignof(type) operator supported 166 // 167 // Compiler-specific feature detection 168 // 169 // V8_HAS___ALIGNOF - __alignof(type) operator supported 170 // V8_HAS___ALIGNOF__ - __alignof__(type) operator supported 171 // V8_HAS_ATTRIBUTE_ALIGNED - __attribute__((aligned(n))) supported 172 // V8_HAS_ATTRIBUTE_ALWAYS_INLINE - __attribute__((always_inline)) 173 // supported 174 // V8_HAS_ATTRIBUTE_DEPRECATED - __attribute__((deprecated)) supported 175 // V8_HAS_ATTRIBUTE_NOINLINE - __attribute__((noinline)) supported 176 // V8_HAS_ATTRIBUTE_NORETURN - __attribute__((noreturn)) supported 177 // V8_HAS_ATTRIBUTE_UNUSED - __attribute__((unused)) supported 178 // V8_HAS_ATTRIBUTE_VISIBILITY - __attribute__((visibility)) supported 179 // V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT - __attribute__((warn_unused_result)) 180 // supported 181 // V8_HAS_BUILTIN_CLZ - __builtin_clz() supported 182 // V8_HAS_BUILTIN_CTZ - __builtin_ctz() supported 183 // V8_HAS_BUILTIN_EXPECT - __builtin_expect() supported 184 // V8_HAS_BUILTIN_FRAME_ADDRESS - __builtin_frame_address() supported 185 // V8_HAS_BUILTIN_POPCOUNT - __builtin_popcount() supported 186 // V8_HAS_BUILTIN_SADD_OVERFLOW - __builtin_sadd_overflow() supported 187 // V8_HAS_BUILTIN_SSUB_OVERFLOW - __builtin_ssub_overflow() supported 188 // V8_HAS_BUILTIN_UADD_OVERFLOW - __builtin_uadd_overflow() supported 189 // V8_HAS_DECLSPEC_ALIGN - __declspec(align(n)) supported 190 // V8_HAS_DECLSPEC_DEPRECATED - __declspec(deprecated) supported 191 // V8_HAS_DECLSPEC_NOINLINE - __declspec(noinline) supported 192 // V8_HAS_DECLSPEC_SELECTANY - __declspec(selectany) supported 193 // V8_HAS_DECLSPEC_NORETURN - __declspec(noreturn) supported 194 // V8_HAS___FORCEINLINE - __forceinline supported 195 // 196 // Note that testing for compilers and/or features must be done using #if 197 // not #ifdef. For example, to test for Intel C++ Compiler, use: 198 // #if V8_CC_INTEL 199 // ... 200 // #endif 201 202 #if defined(__clang__) 203 204 #if defined(__GNUC__) // Clang in gcc mode. 205 # define V8_CC_GNU 1 206 #endif 207 208 // Clang defines __alignof__ as alias for __alignof 209 # define V8_HAS___ALIGNOF 1 210 # define V8_HAS___ALIGNOF__ V8_HAS___ALIGNOF 211 212 # define V8_HAS_ATTRIBUTE_ALIGNED (__has_attribute(aligned)) 213 # define V8_HAS_ATTRIBUTE_ALWAYS_INLINE (__has_attribute(always_inline)) 214 # define V8_HAS_ATTRIBUTE_DEPRECATED (__has_attribute(deprecated)) 215 # define V8_HAS_ATTRIBUTE_NOINLINE (__has_attribute(noinline)) 216 # define V8_HAS_ATTRIBUTE_NORETURN (__has_attribute(noreturn)) 217 # define V8_HAS_ATTRIBUTE_UNUSED (__has_attribute(unused)) 218 # define V8_HAS_ATTRIBUTE_VISIBILITY (__has_attribute(visibility)) 219 # define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT \ 220 (__has_attribute(warn_unused_result)) 221 222 # define V8_HAS_BUILTIN_CLZ (__has_builtin(__builtin_clz)) 223 # define V8_HAS_BUILTIN_CTZ (__has_builtin(__builtin_ctz)) 224 # define V8_HAS_BUILTIN_EXPECT (__has_builtin(__builtin_expect)) 225 # define V8_HAS_BUILTIN_FRAME_ADDRESS (__has_builtin(__builtin_frame_address)) 226 # define V8_HAS_BUILTIN_POPCOUNT (__has_builtin(__builtin_popcount)) 227 # define V8_HAS_BUILTIN_SADD_OVERFLOW (__has_builtin(__builtin_sadd_overflow)) 228 # define V8_HAS_BUILTIN_SSUB_OVERFLOW (__has_builtin(__builtin_ssub_overflow)) 229 # define V8_HAS_BUILTIN_UADD_OVERFLOW (__has_builtin(__builtin_uadd_overflow)) 230 231 # define V8_HAS_CXX11_ALIGNAS (__has_feature(cxx_alignas)) 232 233 #elif defined(__GNUC__) 234 235 # define V8_CC_GNU 1 236 # if defined(__INTEL_COMPILER) // Intel C++ also masquerades as GCC 3.2.0 237 # define V8_CC_INTEL 1 238 # endif 239 # if defined(__MINGW32__) 240 # define V8_CC_MINGW32 1 241 # endif 242 # if defined(__MINGW64__) 243 # define V8_CC_MINGW64 1 244 # endif 245 # define V8_CC_MINGW (V8_CC_MINGW32 || V8_CC_MINGW64) 246 247 # define V8_HAS___ALIGNOF__ (V8_GNUC_PREREQ(4, 3, 0)) 248 249 # define V8_HAS_ATTRIBUTE_ALIGNED (V8_GNUC_PREREQ(2, 95, 0)) 250 // always_inline is available in gcc 4.0 but not very reliable until 4.4. 251 // Works around "sorry, unimplemented: inlining failed" build errors with 252 // older compilers. 253 # define V8_HAS_ATTRIBUTE_ALWAYS_INLINE (V8_GNUC_PREREQ(4, 4, 0)) 254 # define V8_HAS_ATTRIBUTE_DEPRECATED (V8_GNUC_PREREQ(3, 4, 0)) 255 # define V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE (V8_GNUC_PREREQ(4, 5, 0)) 256 # define V8_HAS_ATTRIBUTE_NOINLINE (V8_GNUC_PREREQ(3, 4, 0)) 257 # define V8_HAS_ATTRIBUTE_NORETURN (V8_GNUC_PREREQ(2, 5, 0)) 258 # define V8_HAS_ATTRIBUTE_UNUSED (V8_GNUC_PREREQ(2, 95, 0)) 259 # define V8_HAS_ATTRIBUTE_VISIBILITY (V8_GNUC_PREREQ(4, 3, 0)) 260 # define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT \ 261 (!V8_CC_INTEL && V8_GNUC_PREREQ(4, 1, 0)) 262 263 # define V8_HAS_BUILTIN_CLZ (V8_GNUC_PREREQ(3, 4, 0)) 264 # define V8_HAS_BUILTIN_CTZ (V8_GNUC_PREREQ(3, 4, 0)) 265 # define V8_HAS_BUILTIN_EXPECT (V8_GNUC_PREREQ(2, 96, 0)) 266 # define V8_HAS_BUILTIN_FRAME_ADDRESS (V8_GNUC_PREREQ(2, 96, 0)) 267 # define V8_HAS_BUILTIN_POPCOUNT (V8_GNUC_PREREQ(3, 4, 0)) 268 269 // g++ requires -std=c++0x or -std=gnu++0x to support C++11 functionality 270 // without warnings (functionality used by the macros below). These modes 271 // are detectable by checking whether __GXX_EXPERIMENTAL_CXX0X__ is defined or, 272 // more standardly, by checking whether __cplusplus has a C++11 or greater 273 // value. Current versions of g++ do not correctly set __cplusplus, so we check 274 // both for forward compatibility. 275 # if defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L 276 # define V8_HAS_CXX11_ALIGNAS (V8_GNUC_PREREQ(4, 8, 0)) 277 # define V8_HAS_CXX11_ALIGNOF (V8_GNUC_PREREQ(4, 8, 0)) 278 # endif 279 #endif 280 281 #if defined(_MSC_VER) 282 # define V8_CC_MSVC 1 283 # define V8_HAS___ALIGNOF 1 284 285 # define V8_HAS_DECLSPEC_ALIGN 1 286 # define V8_HAS_DECLSPEC_DEPRECATED 1 287 # define V8_HAS_DECLSPEC_NOINLINE 1 288 # define V8_HAS_DECLSPEC_SELECTANY 1 289 # define V8_HAS_DECLSPEC_NORETURN 1 290 291 # define V8_HAS___FORCEINLINE 1 292 293 #endif 294 295 296 // ----------------------------------------------------------------------------- 297 // Helper macros 298 299 // A macro used to make better inlining. Don't bother for debug builds. 300 // Use like: 301 // V8_INLINE int GetZero() { return 0; } 302 #if !defined(DEBUG) && V8_HAS_ATTRIBUTE_ALWAYS_INLINE 303 # define V8_INLINE inline __attribute__((always_inline)) 304 #elif !defined(DEBUG) && V8_HAS___FORCEINLINE 305 # define V8_INLINE __forceinline 306 #else 307 # define V8_INLINE inline 308 #endif 309 310 311 // A macro used to tell the compiler to never inline a particular function. 312 // Don't bother for debug builds. 313 // Use like: 314 // V8_NOINLINE int GetMinusOne() { return -1; } 315 #if !defined(DEBUG) && V8_HAS_ATTRIBUTE_NOINLINE 316 # define V8_NOINLINE __attribute__((noinline)) 317 #elif !defined(DEBUG) && V8_HAS_DECLSPEC_NOINLINE 318 # define V8_NOINLINE __declspec(noinline) 319 #else 320 # define V8_NOINLINE /* NOT SUPPORTED */ 321 #endif 322 323 324 // A macro used to tell the compiler that a particular function never returns. 325 // Use like: 326 // V8_NORETURN void MyAbort() { abort(); } 327 #if V8_HAS_ATTRIBUTE_NORETURN 328 # define V8_NORETURN __attribute__((noreturn)) 329 #elif HAS_DECLSPEC_NORETURN 330 # define V8_NORETURN __declspec(noreturn) 331 #else 332 # define V8_NORETURN /* NOT SUPPORTED */ 333 #endif 334 335 336 // A macro (V8_DEPRECATED) to mark classes or functions as deprecated. 337 #if defined(V8_DEPRECATION_WARNINGS) && V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE 338 #define V8_DEPRECATED(message, declarator) \ 339 declarator __attribute__((deprecated(message))) 340 #elif defined(V8_DEPRECATION_WARNINGS) && V8_HAS_ATTRIBUTE_DEPRECATED 341 #define V8_DEPRECATED(message, declarator) \ 342 declarator __attribute__((deprecated)) 343 #elif defined(V8_DEPRECATION_WARNINGS) && V8_HAS_DECLSPEC_DEPRECATED 344 #define V8_DEPRECATED(message, declarator) __declspec(deprecated) declarator 345 #else 346 #define V8_DEPRECATED(message, declarator) declarator 347 #endif 348 349 350 // A macro (V8_DEPRECATE_SOON) to make it easier to see what will be deprecated. 351 #if defined(V8_IMMINENT_DEPRECATION_WARNINGS) && \ 352 V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE 353 #define V8_DEPRECATE_SOON(message, declarator) \ 354 declarator __attribute__((deprecated(message))) 355 #elif defined(V8_IMMINENT_DEPRECATION_WARNINGS) && V8_HAS_ATTRIBUTE_DEPRECATED 356 #define V8_DEPRECATE_SOON(message, declarator) \ 357 declarator __attribute__((deprecated)) 358 #elif defined(V8_IMMINENT_DEPRECATION_WARNINGS) && V8_HAS_DECLSPEC_DEPRECATED 359 #define V8_DEPRECATE_SOON(message, declarator) __declspec(deprecated) declarator 360 #else 361 #define V8_DEPRECATE_SOON(message, declarator) declarator 362 #endif 363 364 365 // A macro to provide the compiler with branch prediction information. 366 #if V8_HAS_BUILTIN_EXPECT 367 # define V8_UNLIKELY(condition) (__builtin_expect(!!(condition), 0)) 368 # define V8_LIKELY(condition) (__builtin_expect(!!(condition), 1)) 369 #else 370 # define V8_UNLIKELY(condition) (condition) 371 # define V8_LIKELY(condition) (condition) 372 #endif 373 374 375 // This macro allows to specify memory alignment for structs, classes, etc. 376 // Use like: 377 // class V8_ALIGNED(16) MyClass { ... }; 378 // V8_ALIGNED(32) int array[42]; 379 #if V8_HAS_CXX11_ALIGNAS 380 # define V8_ALIGNED(n) alignas(n) 381 #elif V8_HAS_ATTRIBUTE_ALIGNED 382 # define V8_ALIGNED(n) __attribute__((aligned(n))) 383 #elif V8_HAS_DECLSPEC_ALIGN 384 # define V8_ALIGNED(n) __declspec(align(n)) 385 #else 386 # define V8_ALIGNED(n) /* NOT SUPPORTED */ 387 #endif 388 389 390 // This macro is similar to V8_ALIGNED(), but takes a type instead of size 391 // in bytes. If the compiler does not supports using the alignment of the 392 // |type|, it will align according to the |alignment| instead. For example, 393 // Visual Studio C++ cannot combine __declspec(align) and __alignof. The 394 // |alignment| must be a literal that is used as a kind of worst-case fallback 395 // alignment. 396 // Use like: 397 // struct V8_ALIGNAS(AnotherClass, 16) NewClass { ... }; 398 // V8_ALIGNAS(double, 8) int array[100]; 399 #if V8_HAS_CXX11_ALIGNAS 400 # define V8_ALIGNAS(type, alignment) alignas(type) 401 #elif V8_HAS___ALIGNOF__ && V8_HAS_ATTRIBUTE_ALIGNED 402 # define V8_ALIGNAS(type, alignment) __attribute__((aligned(__alignof__(type)))) 403 #else 404 # define V8_ALIGNAS(type, alignment) V8_ALIGNED(alignment) 405 #endif 406 407 408 // This macro returns alignment in bytes (an integer power of two) required for 409 // any instance of the given type, which is either complete type, an array type, 410 // or a reference type. 411 // Use like: 412 // size_t alignment = V8_ALIGNOF(double); 413 #if V8_HAS_CXX11_ALIGNOF 414 # define V8_ALIGNOF(type) alignof(type) 415 #elif V8_HAS___ALIGNOF 416 # define V8_ALIGNOF(type) __alignof(type) 417 #elif V8_HAS___ALIGNOF__ 418 # define V8_ALIGNOF(type) __alignof__(type) 419 #else 420 // Note that alignment of a type within a struct can be less than the 421 // alignment of the type stand-alone (because of ancient ABIs), so this 422 // should only be used as a last resort. 423 namespace v8 { template <typename T> class AlignOfHelper { char c; T t; }; } 424 # define V8_ALIGNOF(type) (sizeof(::v8::AlignOfHelper<type>) - sizeof(type)) 425 #endif 426 427 // Annotate a function indicating the caller must examine the return value. 428 // Use like: 429 // int foo() WARN_UNUSED_RESULT; 430 #if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT 431 #define V8_WARN_UNUSED_RESULT __attribute__((warn_unused_result)) 432 #else 433 #define V8_WARN_UNUSED_RESULT /* NOT SUPPORTED */ 434 #endif 435 436 // clang-format on 437 438 #endif // V8CONFIG_H_ 439