1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 #ifndef V8_GLOBALS_H_ 29 #define V8_GLOBALS_H_ 30 31 // Define V8_INFINITY 32 #define V8_INFINITY INFINITY 33 34 // GCC specific stuff 35 #ifdef __GNUC__ 36 37 #define __GNUC_VERSION_FOR_INFTY__ (__GNUC__ * 10000 + __GNUC_MINOR__ * 100) 38 39 // Unfortunately, the INFINITY macro cannot be used with the '-pedantic' 40 // warning flag and certain versions of GCC due to a bug: 41 // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11931 42 // For now, we use the more involved template-based version from <limits>, but 43 // only when compiling with GCC versions affected by the bug (2.96.x - 4.0.x) 44 // __GNUC_PREREQ is not defined in GCC for Mac OS X, so we define our own macro 45 #if __GNUC_VERSION_FOR_INFTY__ >= 29600 && __GNUC_VERSION_FOR_INFTY__ < 40100 46 #include <limits> 47 #undef V8_INFINITY 48 #define V8_INFINITY std::numeric_limits<double>::infinity() 49 #endif 50 #undef __GNUC_VERSION_FOR_INFTY__ 51 52 #endif // __GNUC__ 53 54 #ifdef _MSC_VER 55 #undef V8_INFINITY 56 #define V8_INFINITY HUGE_VAL 57 #endif 58 59 60 #include "../include/v8stdint.h" 61 62 namespace v8 { 63 namespace internal { 64 65 // Processor architecture detection. For more info on what's defined, see: 66 // http://msdn.microsoft.com/en-us/library/b0084kay.aspx 67 // http://www.agner.org/optimize/calling_conventions.pdf 68 // or with gcc, run: "echo | gcc -E -dM -" 69 #if defined(_M_X64) || defined(__x86_64__) 70 #if defined(__native_client__) 71 // For Native Client builds of V8, use V8_TARGET_ARCH_ARM, so that V8 72 // generates ARM machine code, together with a portable ARM simulator 73 // compiled for the host architecture in question. 74 // 75 // Since Native Client is ILP-32 on all architectures we use 76 // V8_HOST_ARCH_IA32 on both 32- and 64-bit x86. 77 #define V8_HOST_ARCH_IA32 1 78 #define V8_HOST_ARCH_32_BIT 1 79 #define V8_HOST_CAN_READ_UNALIGNED 1 80 #else 81 #define V8_HOST_ARCH_X64 1 82 #define V8_HOST_ARCH_64_BIT 1 83 #define V8_HOST_CAN_READ_UNALIGNED 1 84 #endif // __native_client__ 85 #elif defined(_M_IX86) || defined(__i386__) 86 #define V8_HOST_ARCH_IA32 1 87 #define V8_HOST_ARCH_32_BIT 1 88 #define V8_HOST_CAN_READ_UNALIGNED 1 89 #elif defined(__ARMEL__) 90 #define V8_HOST_ARCH_ARM 1 91 #define V8_HOST_ARCH_32_BIT 1 92 #elif defined(__MIPSEL__) 93 #define V8_HOST_ARCH_MIPS 1 94 #define V8_HOST_ARCH_32_BIT 1 95 #else 96 #error Host architecture was not detected as supported by v8 97 #endif 98 99 #if defined(__ARM_ARCH_7A__) || \ 100 defined(__ARM_ARCH_7R__) || \ 101 defined(__ARM_ARCH_7__) 102 # define CAN_USE_ARMV7_INSTRUCTIONS 1 103 # ifndef CAN_USE_VFP3_INSTRUCTIONS 104 # define CAN_USE_VFP3_INSTRUCTIONS 105 # endif 106 #endif 107 108 109 // Target architecture detection. This may be set externally. If not, detect 110 // in the same way as the host architecture, that is, target the native 111 // environment as presented by the compiler. 112 #if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32 && \ 113 !V8_TARGET_ARCH_ARM && !V8_TARGET_ARCH_MIPS 114 #if defined(_M_X64) || defined(__x86_64__) 115 #define V8_TARGET_ARCH_X64 1 116 #elif defined(_M_IX86) || defined(__i386__) 117 #define V8_TARGET_ARCH_IA32 1 118 #elif defined(__ARMEL__) 119 #define V8_TARGET_ARCH_ARM 1 120 #elif defined(__MIPSEL__) 121 #define V8_TARGET_ARCH_MIPS 1 122 #else 123 #error Target architecture was not detected as supported by v8 124 #endif 125 #endif 126 127 // Check for supported combinations of host and target architectures. 128 #if V8_TARGET_ARCH_IA32 && !V8_HOST_ARCH_IA32 129 #error Target architecture ia32 is only supported on ia32 host 130 #endif 131 #if V8_TARGET_ARCH_X64 && !V8_HOST_ARCH_X64 132 #error Target architecture x64 is only supported on x64 host 133 #endif 134 #if (V8_TARGET_ARCH_ARM && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_ARM)) 135 #error Target architecture arm is only supported on arm and ia32 host 136 #endif 137 #if (V8_TARGET_ARCH_MIPS && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_MIPS)) 138 #error Target architecture mips is only supported on mips and ia32 host 139 #endif 140 141 // Determine whether we are running in a simulated environment. 142 // Setting USE_SIMULATOR explicitly from the build script will force 143 // the use of a simulated environment. 144 #if !defined(USE_SIMULATOR) 145 #if (V8_TARGET_ARCH_ARM && !V8_HOST_ARCH_ARM) 146 #define USE_SIMULATOR 1 147 #endif 148 #if (V8_TARGET_ARCH_MIPS && !V8_HOST_ARCH_MIPS) 149 #define USE_SIMULATOR 1 150 #endif 151 #endif 152 153 // Determine architecture endiannes (we only support little-endian). 154 #if V8_TARGET_ARCH_IA32 155 #define V8_TARGET_LITTLE_ENDIAN 1 156 #elif V8_TARGET_ARCH_X64 157 #define V8_TARGET_LITTLE_ENDIAN 1 158 #elif V8_TARGET_ARCH_ARM 159 #define V8_TARGET_LITTLE_ENDIAN 1 160 #elif V8_TARGET_ARCH_MIPS 161 #define V8_TARGET_LITTLE_ENDIAN 1 162 #else 163 #error Unknown target architecture endiannes 164 #endif 165 166 // Support for alternative bool type. This is only enabled if the code is 167 // compiled with USE_MYBOOL defined. This catches some nasty type bugs. 168 // For instance, 'bool b = "false";' results in b == true! This is a hidden 169 // source of bugs. 170 // However, redefining the bool type does have some negative impact on some 171 // platforms. It gives rise to compiler warnings (i.e. with 172 // MSVC) in the API header files when mixing code that uses the standard 173 // bool with code that uses the redefined version. 174 // This does not actually belong in the platform code, but needs to be 175 // defined here because the platform code uses bool, and platform.h is 176 // include very early in the main include file. 177 178 #ifdef USE_MYBOOL 179 typedef unsigned int __my_bool__; 180 #define bool __my_bool__ // use 'indirection' to avoid name clashes 181 #endif 182 183 typedef uint8_t byte; 184 typedef byte* Address; 185 186 // Define our own macros for writing 64-bit constants. This is less fragile 187 // than defining __STDC_CONSTANT_MACROS before including <stdint.h>, and it 188 // works on compilers that don't have it (like MSVC). 189 #if V8_HOST_ARCH_64_BIT 190 #if defined(_MSC_VER) 191 #define V8_UINT64_C(x) (x ## UI64) 192 #define V8_INT64_C(x) (x ## I64) 193 #define V8_INTPTR_C(x) (x ## I64) 194 #define V8_PTR_PREFIX "ll" 195 #elif defined(__MINGW64__) 196 #define V8_UINT64_C(x) (x ## ULL) 197 #define V8_INT64_C(x) (x ## LL) 198 #define V8_INTPTR_C(x) (x ## LL) 199 #define V8_PTR_PREFIX "I64" 200 #else 201 #define V8_UINT64_C(x) (x ## UL) 202 #define V8_INT64_C(x) (x ## L) 203 #define V8_INTPTR_C(x) (x ## L) 204 #define V8_PTR_PREFIX "l" 205 #endif 206 #else // V8_HOST_ARCH_64_BIT 207 #define V8_INTPTR_C(x) (x) 208 #define V8_PTR_PREFIX "" 209 #endif // V8_HOST_ARCH_64_BIT 210 211 // The following macro works on both 32 and 64-bit platforms. 212 // Usage: instead of writing 0x1234567890123456 213 // write V8_2PART_UINT64_C(0x12345678,90123456); 214 #define V8_2PART_UINT64_C(a, b) (((static_cast<uint64_t>(a) << 32) + 0x##b##u)) 215 216 #define V8PRIxPTR V8_PTR_PREFIX "x" 217 #define V8PRIdPTR V8_PTR_PREFIX "d" 218 #define V8PRIuPTR V8_PTR_PREFIX "u" 219 220 // Fix for Mac OS X defining uintptr_t as "unsigned long": 221 #if defined(__APPLE__) && defined(__MACH__) 222 #undef V8PRIxPTR 223 #define V8PRIxPTR "lx" 224 #endif 225 226 #if (defined(__APPLE__) && defined(__MACH__)) || \ 227 defined(__FreeBSD__) || defined(__OpenBSD__) 228 #define USING_BSD_ABI 229 #endif 230 231 // ----------------------------------------------------------------------------- 232 // Constants 233 234 const int KB = 1024; 235 const int MB = KB * KB; 236 const int GB = KB * KB * KB; 237 const int kMaxInt = 0x7FFFFFFF; 238 const int kMinInt = -kMaxInt - 1; 239 240 const uint32_t kMaxUInt32 = 0xFFFFFFFFu; 241 242 const int kCharSize = sizeof(char); // NOLINT 243 const int kShortSize = sizeof(short); // NOLINT 244 const int kIntSize = sizeof(int); // NOLINT 245 const int kDoubleSize = sizeof(double); // NOLINT 246 const int kIntptrSize = sizeof(intptr_t); // NOLINT 247 const int kPointerSize = sizeof(void*); // NOLINT 248 const int kRegisterSize = kPointerSize; 249 const int kPCOnStackSize = kRegisterSize; 250 const int kFPOnStackSize = kRegisterSize; 251 252 const int kDoubleSizeLog2 = 3; 253 254 // Size of the state of a the random number generator. 255 const int kRandomStateSize = 2 * kIntSize; 256 257 #if V8_HOST_ARCH_64_BIT 258 const int kPointerSizeLog2 = 3; 259 const intptr_t kIntptrSignBit = V8_INT64_C(0x8000000000000000); 260 const uintptr_t kUintptrAllBitsSet = V8_UINT64_C(0xFFFFFFFFFFFFFFFF); 261 #else 262 const int kPointerSizeLog2 = 2; 263 const intptr_t kIntptrSignBit = 0x80000000; 264 const uintptr_t kUintptrAllBitsSet = 0xFFFFFFFFu; 265 #endif 266 267 const int kBitsPerByte = 8; 268 const int kBitsPerByteLog2 = 3; 269 const int kBitsPerPointer = kPointerSize * kBitsPerByte; 270 const int kBitsPerInt = kIntSize * kBitsPerByte; 271 272 // IEEE 754 single precision floating point number bit layout. 273 const uint32_t kBinary32SignMask = 0x80000000u; 274 const uint32_t kBinary32ExponentMask = 0x7f800000u; 275 const uint32_t kBinary32MantissaMask = 0x007fffffu; 276 const int kBinary32ExponentBias = 127; 277 const int kBinary32MaxExponent = 0xFE; 278 const int kBinary32MinExponent = 0x01; 279 const int kBinary32MantissaBits = 23; 280 const int kBinary32ExponentShift = 23; 281 282 // Quiet NaNs have bits 51 to 62 set, possibly the sign bit, and no 283 // other bits set. 284 const uint64_t kQuietNaNMask = static_cast<uint64_t>(0xfff) << 51; 285 286 // Latin1/UTF-16 constants 287 // Code-point values in Unicode 4.0 are 21 bits wide. 288 // Code units in UTF-16 are 16 bits wide. 289 typedef uint16_t uc16; 290 typedef int32_t uc32; 291 const int kOneByteSize = kCharSize; 292 const int kUC16Size = sizeof(uc16); // NOLINT 293 294 295 // The expression OFFSET_OF(type, field) computes the byte-offset 296 // of the specified field relative to the containing type. This 297 // corresponds to 'offsetof' (in stddef.h), except that it doesn't 298 // use 0 or NULL, which causes a problem with the compiler warnings 299 // we have enabled (which is also why 'offsetof' doesn't seem to work). 300 // Here we simply use the non-zero value 4, which seems to work. 301 #define OFFSET_OF(type, field) \ 302 (reinterpret_cast<intptr_t>(&(reinterpret_cast<type*>(4)->field)) - 4) 303 304 305 // The expression ARRAY_SIZE(a) is a compile-time constant of type 306 // size_t which represents the number of elements of the given 307 // array. You should only use ARRAY_SIZE on statically allocated 308 // arrays. 309 #define ARRAY_SIZE(a) \ 310 ((sizeof(a) / sizeof(*(a))) / \ 311 static_cast<size_t>(!(sizeof(a) % sizeof(*(a))))) 312 313 314 // The USE(x) template is used to silence C++ compiler warnings 315 // issued for (yet) unused variables (typically parameters). 316 template <typename T> 317 inline void USE(T) { } 318 319 320 // FUNCTION_ADDR(f) gets the address of a C function f. 321 #define FUNCTION_ADDR(f) \ 322 (reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(f))) 323 324 325 // FUNCTION_CAST<F>(addr) casts an address into a function 326 // of type F. Used to invoke generated code from within C. 327 template <typename F> 328 F FUNCTION_CAST(Address addr) { 329 return reinterpret_cast<F>(reinterpret_cast<intptr_t>(addr)); 330 } 331 332 333 #if __cplusplus >= 201103L 334 #define DISALLOW_BY_DELETE = delete 335 #else 336 #define DISALLOW_BY_DELETE 337 #endif 338 339 340 // A macro to disallow the evil copy constructor and operator= functions 341 // This should be used in the private: declarations for a class 342 #define DISALLOW_COPY_AND_ASSIGN(TypeName) \ 343 TypeName(const TypeName&) DISALLOW_BY_DELETE; \ 344 void operator=(const TypeName&) DISALLOW_BY_DELETE 345 346 347 // A macro to disallow all the implicit constructors, namely the 348 // default constructor, copy constructor and operator= functions. 349 // 350 // This should be used in the private: declarations for a class 351 // that wants to prevent anyone from instantiating it. This is 352 // especially useful for classes containing only static methods. 353 #define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \ 354 TypeName() DISALLOW_BY_DELETE; \ 355 DISALLOW_COPY_AND_ASSIGN(TypeName) 356 357 358 // Define used for helping GCC to make better inlining. Don't bother for debug 359 // builds. On GCC 3.4.5 using __attribute__((always_inline)) causes compilation 360 // errors in debug build. 361 #if defined(__GNUC__) && !defined(DEBUG) 362 #if (__GNUC__ >= 4) 363 #define INLINE(header) inline header __attribute__((always_inline)) 364 #define NO_INLINE(header) header __attribute__((noinline)) 365 #else 366 #define INLINE(header) inline __attribute__((always_inline)) header 367 #define NO_INLINE(header) __attribute__((noinline)) header 368 #endif 369 #elif defined(_MSC_VER) && !defined(DEBUG) 370 #define INLINE(header) __forceinline header 371 #define NO_INLINE(header) header 372 #else 373 #define INLINE(header) inline header 374 #define NO_INLINE(header) header 375 #endif 376 377 378 #if defined(__GNUC__) && __GNUC__ >= 4 379 #define MUST_USE_RESULT __attribute__ ((warn_unused_result)) 380 #else 381 #define MUST_USE_RESULT 382 #endif 383 384 385 // Define DISABLE_ASAN macros. 386 #if defined(__has_feature) 387 #if __has_feature(address_sanitizer) 388 #define DISABLE_ASAN __attribute__((no_address_safety_analysis)) 389 #endif 390 #endif 391 392 393 #ifndef DISABLE_ASAN 394 #define DISABLE_ASAN 395 #endif 396 397 398 // ----------------------------------------------------------------------------- 399 // Forward declarations for frequently used classes 400 // (sorted alphabetically) 401 402 class FreeStoreAllocationPolicy; 403 template <typename T, class P = FreeStoreAllocationPolicy> class List; 404 405 // ----------------------------------------------------------------------------- 406 // Declarations for use in both the preparser and the rest of V8. 407 408 // The different language modes that V8 implements. ES5 defines two language 409 // modes: an unrestricted mode respectively a strict mode which are indicated by 410 // CLASSIC_MODE respectively STRICT_MODE in the enum. The harmony spec drafts 411 // for the next ES standard specify a new third mode which is called 'extended 412 // mode'. The extended mode is only available if the harmony flag is set. It is 413 // based on the 'strict mode' and adds new functionality to it. This means that 414 // most of the semantics of these two modes coincide. 415 // 416 // In the current draft the term 'base code' is used to refer to code that is 417 // neither in strict nor extended mode. However, the more distinguishing term 418 // 'classic mode' is used in V8 instead to avoid mix-ups. 419 420 enum LanguageMode { 421 CLASSIC_MODE, 422 STRICT_MODE, 423 EXTENDED_MODE 424 }; 425 426 427 // A simple Maybe type, that can be passed by value. 428 template<class T> 429 struct Maybe { 430 Maybe() : has_value(false) {} 431 explicit Maybe(T t) : has_value(true), value(t) {} 432 Maybe(bool has, T t) : has_value(has), value(t) {} 433 434 bool has_value; 435 T value; 436 }; 437 438 439 // The Strict Mode (ECMA-262 5th edition, 4.2.2). 440 // 441 // This flag is used in the backend to represent the language mode. So far 442 // there is no semantic difference between the strict and the extended mode in 443 // the backend, so both modes are represented by the kStrictMode value. 444 enum StrictModeFlag { 445 kNonStrictMode, 446 kStrictMode 447 }; 448 449 450 } } // namespace v8::internal 451 452 #endif // V8_GLOBALS_H_ 453
