| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_GLOBALS_H_ |
| #define V8_GLOBALS_H_ |
| |
| // Define V8_INFINITY |
| #define V8_INFINITY INFINITY |
| |
| // GCC specific stuff |
| #ifdef __GNUC__ |
| |
| #define __GNUC_VERSION_FOR_INFTY__ (__GNUC__ * 10000 + __GNUC_MINOR__ * 100) |
| |
| // Unfortunately, the INFINITY macro cannot be used with the '-pedantic' |
| // warning flag and certain versions of GCC due to a bug: |
| // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11931 |
| // For now, we use the more involved template-based version from <limits>, but |
| // only when compiling with GCC versions affected by the bug (2.96.x - 4.0.x) |
| // __GNUC_PREREQ is not defined in GCC for Mac OS X, so we define our own macro |
| #if __GNUC_VERSION_FOR_INFTY__ >= 29600 && __GNUC_VERSION_FOR_INFTY__ < 40100 |
| #include <limits> |
| #undef V8_INFINITY |
| #define V8_INFINITY std::numeric_limits<double>::infinity() |
| #endif |
| #undef __GNUC_VERSION_FOR_INFTY__ |
| |
| #endif // __GNUC__ |
| |
| #ifdef _MSC_VER |
| #undef V8_INFINITY |
| #define V8_INFINITY HUGE_VAL |
| #endif |
| |
| |
| #include "../include/v8stdint.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // Processor architecture detection. For more info on what's defined, see: |
| // http://msdn.microsoft.com/en-us/library/b0084kay.aspx |
| // http://www.agner.org/optimize/calling_conventions.pdf |
| // or with gcc, run: "echo | gcc -E -dM -" |
| #if defined(_M_X64) || defined(__x86_64__) |
| #define V8_HOST_ARCH_X64 1 |
| #define V8_HOST_ARCH_64_BIT 1 |
| #define V8_HOST_CAN_READ_UNALIGNED 1 |
| #elif defined(_M_IX86) || defined(__i386__) |
| #define V8_HOST_ARCH_IA32 1 |
| #define V8_HOST_ARCH_32_BIT 1 |
| #define V8_HOST_CAN_READ_UNALIGNED 1 |
| #elif defined(__ARMEL__) |
| #define V8_HOST_ARCH_ARM 1 |
| #define V8_HOST_ARCH_32_BIT 1 |
| // Some CPU-OS combinations allow unaligned access on ARM. We assume |
| // that unaligned accesses are not allowed unless the build system |
| // defines the CAN_USE_UNALIGNED_ACCESSES macro to be non-zero. |
| #if CAN_USE_UNALIGNED_ACCESSES |
| #define V8_HOST_CAN_READ_UNALIGNED 1 |
| #endif |
| #elif defined(__MIPSEL__) |
| #define V8_HOST_ARCH_MIPS 1 |
| #define V8_HOST_ARCH_32_BIT 1 |
| #else |
| #error Host architecture was not detected as supported by v8 |
| #endif |
| |
| // Target architecture detection. This may be set externally. If not, detect |
| // in the same way as the host architecture, that is, target the native |
| // environment as presented by the compiler. |
| #if !defined(V8_TARGET_ARCH_X64) && !defined(V8_TARGET_ARCH_IA32) && \ |
| !defined(V8_TARGET_ARCH_ARM) && !defined(V8_TARGET_ARCH_MIPS) |
| #if defined(_M_X64) || defined(__x86_64__) |
| #define V8_TARGET_ARCH_X64 1 |
| #elif defined(_M_IX86) || defined(__i386__) |
| #define V8_TARGET_ARCH_IA32 1 |
| #elif defined(__ARMEL__) |
| #define V8_TARGET_ARCH_ARM 1 |
| #elif defined(__MIPSEL__) |
| #define V8_TARGET_ARCH_MIPS 1 |
| #else |
| #error Target architecture was not detected as supported by v8 |
| #endif |
| #endif |
| |
| // Check for supported combinations of host and target architectures. |
| #if defined(V8_TARGET_ARCH_IA32) && !defined(V8_HOST_ARCH_IA32) |
| #error Target architecture ia32 is only supported on ia32 host |
| #endif |
| #if defined(V8_TARGET_ARCH_X64) && !defined(V8_HOST_ARCH_X64) |
| #error Target architecture x64 is only supported on x64 host |
| #endif |
| #if (defined(V8_TARGET_ARCH_ARM) && \ |
| !(defined(V8_HOST_ARCH_IA32) || defined(V8_HOST_ARCH_ARM))) |
| #error Target architecture arm is only supported on arm and ia32 host |
| #endif |
| #if (defined(V8_TARGET_ARCH_MIPS) && \ |
| !(defined(V8_HOST_ARCH_IA32) || defined(V8_HOST_ARCH_MIPS))) |
| #error Target architecture mips is only supported on mips and ia32 host |
| #endif |
| |
| // Determine whether we are running in a simulated environment. |
| // Setting USE_SIMULATOR explicitly from the build script will force |
| // the use of a simulated environment. |
| #if !defined(USE_SIMULATOR) |
| #if (defined(V8_TARGET_ARCH_ARM) && !defined(V8_HOST_ARCH_ARM)) |
| #define USE_SIMULATOR 1 |
| #endif |
| #if (defined(V8_TARGET_ARCH_MIPS) && !defined(V8_HOST_ARCH_MIPS)) |
| #define USE_SIMULATOR 1 |
| #endif |
| #endif |
| |
| // Support for alternative bool type. This is only enabled if the code is |
| // compiled with USE_MYBOOL defined. This catches some nasty type bugs. |
| // For instance, 'bool b = "false";' results in b == true! This is a hidden |
| // source of bugs. |
| // However, redefining the bool type does have some negative impact on some |
| // platforms. It gives rise to compiler warnings (i.e. with |
| // MSVC) in the API header files when mixing code that uses the standard |
| // bool with code that uses the redefined version. |
| // This does not actually belong in the platform code, but needs to be |
| // defined here because the platform code uses bool, and platform.h is |
| // include very early in the main include file. |
| |
| #ifdef USE_MYBOOL |
| typedef unsigned int __my_bool__; |
| #define bool __my_bool__ // use 'indirection' to avoid name clashes |
| #endif |
| |
| typedef uint8_t byte; |
| typedef byte* Address; |
| |
| // Define our own macros for writing 64-bit constants. This is less fragile |
| // than defining __STDC_CONSTANT_MACROS before including <stdint.h>, and it |
| // works on compilers that don't have it (like MSVC). |
| #if V8_HOST_ARCH_64_BIT |
| #if defined(_MSC_VER) |
| #define V8_UINT64_C(x) (x ## UI64) |
| #define V8_INT64_C(x) (x ## I64) |
| #define V8_INTPTR_C(x) (x ## I64) |
| #define V8_PTR_PREFIX "ll" |
| #elif defined(__MINGW64__) |
| #define V8_UINT64_C(x) (x ## ULL) |
| #define V8_INT64_C(x) (x ## LL) |
| #define V8_INTPTR_C(x) (x ## LL) |
| #define V8_PTR_PREFIX "I64" |
| #else |
| #define V8_UINT64_C(x) (x ## UL) |
| #define V8_INT64_C(x) (x ## L) |
| #define V8_INTPTR_C(x) (x ## L) |
| #define V8_PTR_PREFIX "l" |
| #endif |
| #else // V8_HOST_ARCH_64_BIT |
| #define V8_INTPTR_C(x) (x) |
| #define V8_PTR_PREFIX "" |
| #endif // V8_HOST_ARCH_64_BIT |
| |
| // The following macro works on both 32 and 64-bit platforms. |
| // Usage: instead of writing 0x1234567890123456 |
| // write V8_2PART_UINT64_C(0x12345678,90123456); |
| #define V8_2PART_UINT64_C(a, b) (((static_cast<uint64_t>(a) << 32) + 0x##b##u)) |
| |
| #define V8PRIxPTR V8_PTR_PREFIX "x" |
| #define V8PRIdPTR V8_PTR_PREFIX "d" |
| #define V8PRIuPTR V8_PTR_PREFIX "u" |
| |
| // Fix for Mac OS X defining uintptr_t as "unsigned long": |
| #if defined(__APPLE__) && defined(__MACH__) |
| #undef V8PRIxPTR |
| #define V8PRIxPTR "lx" |
| #endif |
| |
| #if (defined(__APPLE__) && defined(__MACH__)) || \ |
| defined(__FreeBSD__) || defined(__OpenBSD__) |
| #define USING_BSD_ABI |
| #endif |
| |
| // ----------------------------------------------------------------------------- |
| // Constants |
| |
| const int KB = 1024; |
| const int MB = KB * KB; |
| const int GB = KB * KB * KB; |
| const int kMaxInt = 0x7FFFFFFF; |
| const int kMinInt = -kMaxInt - 1; |
| |
| const uint32_t kMaxUInt32 = 0xFFFFFFFFu; |
| |
| const int kCharSize = sizeof(char); // NOLINT |
| const int kShortSize = sizeof(short); // NOLINT |
| const int kIntSize = sizeof(int); // NOLINT |
| const int kDoubleSize = sizeof(double); // NOLINT |
| const int kIntptrSize = sizeof(intptr_t); // NOLINT |
| const int kPointerSize = sizeof(void*); // NOLINT |
| |
| const int kDoubleSizeLog2 = 3; |
| |
| // Size of the state of a the random number generator. |
| const int kRandomStateSize = 2 * kIntSize; |
| |
| #if V8_HOST_ARCH_64_BIT |
| const int kPointerSizeLog2 = 3; |
| const intptr_t kIntptrSignBit = V8_INT64_C(0x8000000000000000); |
| const uintptr_t kUintptrAllBitsSet = V8_UINT64_C(0xFFFFFFFFFFFFFFFF); |
| #else |
| const int kPointerSizeLog2 = 2; |
| const intptr_t kIntptrSignBit = 0x80000000; |
| const uintptr_t kUintptrAllBitsSet = 0xFFFFFFFFu; |
| #endif |
| |
| const int kBitsPerByte = 8; |
| const int kBitsPerByteLog2 = 3; |
| const int kBitsPerPointer = kPointerSize * kBitsPerByte; |
| const int kBitsPerInt = kIntSize * kBitsPerByte; |
| |
| // IEEE 754 single precision floating point number bit layout. |
| const uint32_t kBinary32SignMask = 0x80000000u; |
| const uint32_t kBinary32ExponentMask = 0x7f800000u; |
| const uint32_t kBinary32MantissaMask = 0x007fffffu; |
| const int kBinary32ExponentBias = 127; |
| const int kBinary32MaxExponent = 0xFE; |
| const int kBinary32MinExponent = 0x01; |
| const int kBinary32MantissaBits = 23; |
| const int kBinary32ExponentShift = 23; |
| |
| // Quiet NaNs have bits 51 to 62 set, possibly the sign bit, and no |
| // other bits set. |
| const uint64_t kQuietNaNMask = static_cast<uint64_t>(0xfff) << 51; |
| |
| // Latin1/UTF-16 constants |
| // Code-point values in Unicode 4.0 are 21 bits wide. |
| // Code units in UTF-16 are 16 bits wide. |
| typedef uint16_t uc16; |
| typedef int32_t uc32; |
| const int kOneByteSize = kCharSize; |
| const int kUC16Size = sizeof(uc16); // NOLINT |
| |
| |
| // The expression OFFSET_OF(type, field) computes the byte-offset |
| // of the specified field relative to the containing type. This |
| // corresponds to 'offsetof' (in stddef.h), except that it doesn't |
| // use 0 or NULL, which causes a problem with the compiler warnings |
| // we have enabled (which is also why 'offsetof' doesn't seem to work). |
| // Here we simply use the non-zero value 4, which seems to work. |
| #define OFFSET_OF(type, field) \ |
| (reinterpret_cast<intptr_t>(&(reinterpret_cast<type*>(4)->field)) - 4) |
| |
| |
| // The expression ARRAY_SIZE(a) is a compile-time constant of type |
| // size_t which represents the number of elements of the given |
| // array. You should only use ARRAY_SIZE on statically allocated |
| // arrays. |
| #define ARRAY_SIZE(a) \ |
| ((sizeof(a) / sizeof(*(a))) / \ |
| static_cast<size_t>(!(sizeof(a) % sizeof(*(a))))) |
| |
| |
| // The USE(x) template is used to silence C++ compiler warnings |
| // issued for (yet) unused variables (typically parameters). |
| template <typename T> |
| inline void USE(T) { } |
| |
| |
| // FUNCTION_ADDR(f) gets the address of a C function f. |
| #define FUNCTION_ADDR(f) \ |
| (reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(f))) |
| |
| |
| // FUNCTION_CAST<F>(addr) casts an address into a function |
| // of type F. Used to invoke generated code from within C. |
| template <typename F> |
| F FUNCTION_CAST(Address addr) { |
| return reinterpret_cast<F>(reinterpret_cast<intptr_t>(addr)); |
| } |
| |
| |
| // A macro to disallow the evil copy constructor and operator= functions |
| // This should be used in the private: declarations for a class |
| #define DISALLOW_COPY_AND_ASSIGN(TypeName) \ |
| TypeName(const TypeName&); \ |
| void operator=(const TypeName&) |
| |
| |
| // A macro to disallow all the implicit constructors, namely the |
| // default constructor, copy constructor and operator= functions. |
| // |
| // This should be used in the private: declarations for a class |
| // that wants to prevent anyone from instantiating it. This is |
| // especially useful for classes containing only static methods. |
| #define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \ |
| TypeName(); \ |
| DISALLOW_COPY_AND_ASSIGN(TypeName) |
| |
| |
| // Define used for helping GCC to make better inlining. Don't bother for debug |
| // builds. On GCC 3.4.5 using __attribute__((always_inline)) causes compilation |
| // errors in debug build. |
| #if defined(__GNUC__) && !defined(DEBUG) |
| #if (__GNUC__ >= 4) |
| #define INLINE(header) inline header __attribute__((always_inline)) |
| #define NO_INLINE(header) header __attribute__((noinline)) |
| #else |
| #define INLINE(header) inline __attribute__((always_inline)) header |
| #define NO_INLINE(header) __attribute__((noinline)) header |
| #endif |
| #elif defined(_MSC_VER) && !defined(DEBUG) |
| #define INLINE(header) __forceinline header |
| #define NO_INLINE(header) header |
| #else |
| #define INLINE(header) inline header |
| #define NO_INLINE(header) header |
| #endif |
| |
| |
| #if defined(__GNUC__) && __GNUC__ >= 4 |
| #define MUST_USE_RESULT __attribute__ ((warn_unused_result)) |
| #else |
| #define MUST_USE_RESULT |
| #endif |
| |
| |
| // Define DISABLE_ASAN macros. |
| #if defined(__has_feature) |
| #if __has_feature(address_sanitizer) |
| #define DISABLE_ASAN __attribute__((no_address_safety_analysis)) |
| #endif |
| #endif |
| |
| |
| #ifndef DISABLE_ASAN |
| #define DISABLE_ASAN |
| #endif |
| |
| |
| // ----------------------------------------------------------------------------- |
| // Forward declarations for frequently used classes |
| // (sorted alphabetically) |
| |
| class FreeStoreAllocationPolicy; |
| template <typename T, class P = FreeStoreAllocationPolicy> class List; |
| |
| // ----------------------------------------------------------------------------- |
| // Declarations for use in both the preparser and the rest of V8. |
| |
| // The different language modes that V8 implements. ES5 defines two language |
| // modes: an unrestricted mode respectively a strict mode which are indicated by |
| // CLASSIC_MODE respectively STRICT_MODE in the enum. The harmony spec drafts |
| // for the next ES standard specify a new third mode which is called 'extended |
| // mode'. The extended mode is only available if the harmony flag is set. It is |
| // based on the 'strict mode' and adds new functionality to it. This means that |
| // most of the semantics of these two modes coincide. |
| // |
| // In the current draft the term 'base code' is used to refer to code that is |
| // neither in strict nor extended mode. However, the more distinguishing term |
| // 'classic mode' is used in V8 instead to avoid mix-ups. |
| |
| enum LanguageMode { |
| CLASSIC_MODE, |
| STRICT_MODE, |
| EXTENDED_MODE |
| }; |
| |
| |
| // The Strict Mode (ECMA-262 5th edition, 4.2.2). |
| // |
| // This flag is used in the backend to represent the language mode. So far |
| // there is no semantic difference between the strict and the extended mode in |
| // the backend, so both modes are represented by the kStrictMode value. |
| enum StrictModeFlag { |
| kNonStrictMode, |
| kStrictMode |
| }; |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_GLOBALS_H_ |