CSE2410 Fall 2014 Bounce

// 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_

#include "../include/v8stdint.h"

// 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)

#if V8_CC_GNU && V8_GNUC_PREREQ(2, 96, 0) && !V8_GNUC_PREREQ(4, 1, 0)

# include <limits>  // NOLINT

# define V8_INFINITY std::numeric_limits<double>::infinity()

#elif V8_CC_MSVC

# define V8_INFINITY HUGE_VAL

#else

# define V8_INFINITY INFINITY

#endif

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__)

#if defined(__native_client__)

// For Native Client builds of V8, use V8_TARGET_ARCH_ARM, so that V8

// generates ARM machine code, together with a portable ARM simulator

// compiled for the host architecture in question.

//

// Since Native Client is ILP-32 on all architectures we use

// V8_HOST_ARCH_IA32 on both 32- and 64-bit x86.

#define V8_HOST_ARCH_IA32 1

#define V8_HOST_ARCH_32_BIT 1

#define V8_HOST_CAN_READ_UNALIGNED 1

#else

#define V8_HOST_ARCH_X64 1

#define V8_HOST_ARCH_64_BIT 1

#define V8_HOST_CAN_READ_UNALIGNED 1

#endif  // __native_client__

#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

#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

#if defined(__ARM_ARCH_7A__) || \

    defined(__ARM_ARCH_7R__) || \

    defined(__ARM_ARCH_7__)

# define CAN_USE_ARMV7_INSTRUCTIONS 1

# ifndef CAN_USE_VFP3_INSTRUCTIONS

#  define CAN_USE_VFP3_INSTRUCTIONS

# endif

#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 !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32 && \

    !V8_TARGET_ARCH_ARM && !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 V8_TARGET_ARCH_IA32 && !V8_HOST_ARCH_IA32

#error Target architecture ia32 is only supported on ia32 host

#endif

#if V8_TARGET_ARCH_X64 && !V8_HOST_ARCH_X64

#error Target architecture x64 is only supported on x64 host

#endif

#if (V8_TARGET_ARCH_ARM && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_ARM))

#error Target architecture arm is only supported on arm and ia32 host

#endif

#if (V8_TARGET_ARCH_MIPS && !(V8_HOST_ARCH_IA32 || 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 (V8_TARGET_ARCH_ARM && !V8_HOST_ARCH_ARM)

#define USE_SIMULATOR 1

#endif

#if (V8_TARGET_ARCH_MIPS && !V8_HOST_ARCH_MIPS)

#define USE_SIMULATOR 1

#endif

#endif

// Determine architecture endiannes (we only support little-endian).

#if V8_TARGET_ARCH_IA32

#define V8_TARGET_LITTLE_ENDIAN 1

#elif V8_TARGET_ARCH_X64

#define V8_TARGET_LITTLE_ENDIAN 1

#elif V8_TARGET_ARCH_ARM

#define V8_TARGET_LITTLE_ENDIAN 1

#elif V8_TARGET_ARCH_MIPS

#define V8_TARGET_LITTLE_ENDIAN 1

#else

#error Unknown target architecture endiannes

#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_CC_MSVC

# define V8_UINT64_C(x)   (x ## UI64)

# define V8_INT64_C(x)    (x ## I64)

# if V8_HOST_ARCH_64_BIT

#  define V8_INTPTR_C(x)  (x ## I64)

#  define V8_PTR_PREFIX   "ll"

# else

#  define V8_INTPTR_C(x)  (x)

#  define V8_PTR_PREFIX   ""

# endif  // V8_HOST_ARCH_64_BIT

#elif V8_CC_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"

#elif V8_HOST_ARCH_64_BIT

# 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"

#else

# define V8_UINT64_C(x)   (x ## ULL)

# define V8_INT64_C(x)    (x ## LL)

# define V8_INTPTR_C(x)   (x)

# define V8_PTR_PREFIX    ""

#endif

// 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 kInt32Size     = sizeof(int32_t);   // NOLINT

const int kInt64Size     = sizeof(int64_t);   // NOLINT

const int kDoubleSize    = sizeof(double);    // NOLINT

const int kIntptrSize    = sizeof(intptr_t);  // NOLINT

const int kPointerSize   = sizeof(void*);     // NOLINT

const int kRegisterSize  = kPointerSize;

const int kPCOnStackSize = kRegisterSize;

const int kFPOnStackSize = kRegisterSize;

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);

const bool kIs64BitArch = true;

#else

const int kPointerSizeLog2 = 2;

const intptr_t kIntptrSignBit = 0x80000000;

const uintptr_t kUintptrAllBitsSet = 0xFFFFFFFFu;

const bool kIs64BitArch = false;

#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

// Round up n to be a multiple of sz, where sz is a power of 2.

#define ROUND_UP(n, sz) (((n) + ((sz) - 1)) & ~((sz) - 1))

// 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&) V8_DELETE;      \

  void operator=(const TypeName&) V8_DELETE

// 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() V8_DELETE;                           \

  DISALLOW_COPY_AND_ASSIGN(TypeName)

// Newly written code should use V8_INLINE and V8_NOINLINE directly.

#define INLINE(declarator)    V8_INLINE declarator

#define NO_INLINE(declarator) V8_NOINLINE declarator

// Newly written code should use V8_WARN_UNUSED_RESULT.

#define MUST_USE_RESULT V8_WARN_UNUSED_RESULT

// Define DISABLE_ASAN macros.

#if defined(__has_feature)

#if __has_feature(address_sanitizer)

#define DISABLE_ASAN __attribute__((no_sanitize_address))

#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_