A fix for the globals.h TODO in libplatform.

src/globals.h

-// 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
-# if V8_OS_MACOSX
-#  define V8_UINT64_C(x)   (x ## ULL)
-#  define V8_INT64_C(x)    (x ## LL)
-# else
-#  define V8_UINT64_C(x)   (x ## UL)
-#  define V8_INT64_C(x)    (x ## L)
-# endif
-# 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 V8_OS_MACOSX
-#undef V8PRIxPTR
-#define V8PRIxPTR "lx"
-#endif
-
-#if V8_OS_MACOSX || 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 int kMaxInt8 = (1 << 7) - 1;
-const int kMinInt8 = -(1 << 7);
-const int kMaxUInt8 = (1 << 8) - 1;
-const int kMinUInt8 = 0;
-const int kMaxInt16 = (1 << 15) - 1;
-const int kMinInt16 = -(1 << 15);
-const int kMaxUInt16 = (1 << 16) - 1;
-const int kMinUInt16 = 0;
-
-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;
-
-#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_