Imported v8 version 3.7.3 from https://github.com/v8/v8.git

Change-Id: I152648081e46f599c2bb88eaaf67034fa5daac3a

1 files changed, 2042 insertions, 0 deletions

diff --git a/src/3rdparty/v8/src/platform-win32.cc b/src/3rdparty/v8/src/platform-win32.cc
new file mode 100644
index 0000000..8771c43
--- /dev/null
+++ b/src/3rdparty/v8/src/platform-win32.cc
@@ -0,0 +1,2042 @@
+// Copyright 2011 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.
+
+// Platform specific code for Win32.
+
+#define V8_WIN32_HEADERS_FULL
+#include "win32-headers.h"
+
+#include "v8.h"
+
+#include "platform.h"
+#include "vm-state-inl.h"
+
+#ifdef _MSC_VER
+
+// Case-insensitive bounded string comparisons. Use stricmp() on Win32. Usually
+// defined in strings.h.
+int strncasecmp(const char* s1, const char* s2, int n) {
+  return _strnicmp(s1, s2, n);
+}
+
+#endif  // _MSC_VER
+
+
+// Extra functions for MinGW. Most of these are the _s functions which are in
+// the Microsoft Visual Studio C++ CRT.
+#ifdef __MINGW32__
+
+int localtime_s(tm* out_tm, const time_t* time) {
+  tm* posix_local_time_struct = localtime(time);
+  if (posix_local_time_struct == NULL) return 1;
+  *out_tm = *posix_local_time_struct;
+  return 0;
+}
+
+
+// Not sure this the correct interpretation of _mkgmtime
+time_t _mkgmtime(tm* timeptr) {
+  return mktime(timeptr);
+}
+
+
+int fopen_s(FILE** pFile, const char* filename, const char* mode) {
+  *pFile = fopen(filename, mode);
+  return *pFile != NULL ? 0 : 1;
+}
+
+
+#define _TRUNCATE 0
+#define STRUNCATE 80
+
+int _vsnprintf_s(char* buffer, size_t sizeOfBuffer, size_t count,
+                 const char* format, va_list argptr) {
+  ASSERT(count == _TRUNCATE);
+  return _vsnprintf(buffer, sizeOfBuffer, format, argptr);
+}
+
+
+int strncpy_s(char* dest, size_t dest_size, const char* source, size_t count) {
+  CHECK(source != NULL);
+  CHECK(dest != NULL);
+  CHECK_GT(dest_size, 0);
+
+  if (count == _TRUNCATE) {
+    while (dest_size > 0 && *source != 0) {
+      *(dest++) = *(source++);
+      --dest_size;
+    }
+    if (dest_size == 0) {
+      *(dest - 1) = 0;
+      return STRUNCATE;
+    }
+  } else {
+    while (dest_size > 0 && count > 0 && *source != 0) {
+      *(dest++) = *(source++);
+      --dest_size;
+      --count;
+    }
+  }
+  CHECK_GT(dest_size, 0);
+  *dest = 0;
+  return 0;
+}
+
+
+inline void MemoryBarrier() {
+  int barrier = 0;
+  __asm__ __volatile__("xchgl %%eax,%0 ":"=r" (barrier));
+}
+
+#endif  // __MINGW32__
+
+// Generate a pseudo-random number in the range 0-2^31-1. Usually
+// defined in stdlib.h. Missing in both Microsoft Visual Studio C++ and MinGW.
+int random() {
+  return rand();
+}
+
+
+namespace v8 {
+namespace internal {
+
+intptr_t OS::MaxVirtualMemory() {
+  return 0;
+}
+
+
+double ceiling(double x) {
+  return ceil(x);
+}
+
+
+static Mutex* limit_mutex = NULL;
+
+#if defined(V8_TARGET_ARCH_IA32)
+static OS::MemCopyFunction memcopy_function = NULL;
+static Mutex* memcopy_function_mutex = OS::CreateMutex();
+// Defined in codegen-ia32.cc.
+OS::MemCopyFunction CreateMemCopyFunction();
+
+// Copy memory area to disjoint memory area.
+void OS::MemCopy(void* dest, const void* src, size_t size) {
+  if (memcopy_function == NULL) {
+    ScopedLock lock(memcopy_function_mutex);
+    if (memcopy_function == NULL) {
+      OS::MemCopyFunction temp = CreateMemCopyFunction();
+      MemoryBarrier();
+      memcopy_function = temp;
+    }
+  }
+  // Note: here we rely on dependent reads being ordered. This is true
+  // on all architectures we currently support.
+  (*memcopy_function)(dest, src, size);
+#ifdef DEBUG
+  CHECK_EQ(0, memcmp(dest, src, size));
+#endif
+}
+#endif  // V8_TARGET_ARCH_IA32
+
+#ifdef _WIN64
+typedef double (*ModuloFunction)(double, double);
+static ModuloFunction modulo_function = NULL;
+static Mutex* modulo_function_mutex = OS::CreateMutex();
+// Defined in codegen-x64.cc.
+ModuloFunction CreateModuloFunction();
+
+double modulo(double x, double y) {
+  if (modulo_function == NULL) {
+    ScopedLock lock(modulo_function_mutex);
+    if (modulo_function == NULL) {
+      ModuloFunction temp = CreateModuloFunction();
+      MemoryBarrier();
+      modulo_function = temp;
+    }
+  }
+  // Note: here we rely on dependent reads being ordered. This is true
+  // on all architectures we currently support.
+  return (*modulo_function)(x, y);
+}
+#else  // Win32
+
+double modulo(double x, double y) {
+  // Workaround MS fmod bugs. ECMA-262 says:
+  // dividend is finite and divisor is an infinity => result equals dividend
+  // dividend is a zero and divisor is nonzero finite => result equals dividend
+  if (!(isfinite(x) && (!isfinite(y) && !isnan(y))) &&
+      !(x == 0 && (y != 0 && isfinite(y)))) {
+    x = fmod(x, y);
+  }
+  return x;
+}
+
+#endif  // _WIN64
+
+// ----------------------------------------------------------------------------
+// The Time class represents time on win32. A timestamp is represented as
+// a 64-bit integer in 100 nano-seconds since January 1, 1601 (UTC). JavaScript
+// timestamps are represented as a doubles in milliseconds since 00:00:00 UTC,
+// January 1, 1970.
+
+class Time {
+ public:
+  // Constructors.
+  Time();
+  explicit Time(double jstime);
+  Time(int year, int mon, int day, int hour, int min, int sec);
+
+  // Convert timestamp to JavaScript representation.
+  double ToJSTime();
+
+  // Set timestamp to current time.
+  void SetToCurrentTime();
+
+  // Returns the local timezone offset in milliseconds east of UTC. This is
+  // the number of milliseconds you must add to UTC to get local time, i.e.
+  // LocalOffset(CET) = 3600000 and LocalOffset(PST) = -28800000. This
+  // routine also takes into account whether daylight saving is effect
+  // at the time.
+  int64_t LocalOffset();
+
+  // Returns the daylight savings time offset for the time in milliseconds.
+  int64_t DaylightSavingsOffset();
+
+  // Returns a string identifying the current timezone for the
+  // timestamp taking into account daylight saving.
+  char* LocalTimezone();
+
+ private:
+  // Constants for time conversion.
+  static const int64_t kTimeEpoc = 116444736000000000LL;
+  static const int64_t kTimeScaler = 10000;
+  static const int64_t kMsPerMinute = 60000;
+
+  // Constants for timezone information.
+  static const int kTzNameSize = 128;
+  static const bool kShortTzNames = false;
+
+  // Timezone information. We need to have static buffers for the
+  // timezone names because we return pointers to these in
+  // LocalTimezone().
+  static bool tz_initialized_;
+  static TIME_ZONE_INFORMATION tzinfo_;
+  static char std_tz_name_[kTzNameSize];
+  static char dst_tz_name_[kTzNameSize];
+
+  // Initialize the timezone information (if not already done).
+  static void TzSet();
+
+  // Guess the name of the timezone from the bias.
+  static const char* GuessTimezoneNameFromBias(int bias);
+
+  // Return whether or not daylight savings time is in effect at this time.
+  bool InDST();
+
+  // Return the difference (in milliseconds) between this timestamp and
+  // another timestamp.
+  int64_t Diff(Time* other);
+
+  // Accessor for FILETIME representation.
+  FILETIME& ft() { return time_.ft_; }
+
+  // Accessor for integer representation.
+  int64_t& t() { return time_.t_; }
+
+  // Although win32 uses 64-bit integers for representing timestamps,
+  // these are packed into a FILETIME structure. The FILETIME structure
+  // is just a struct representing a 64-bit integer. The TimeStamp union
+  // allows access to both a FILETIME and an integer representation of
+  // the timestamp.
+  union TimeStamp {
+    FILETIME ft_;
+    int64_t t_;
+  };
+
+  TimeStamp time_;
+};
+
+// Static variables.
+bool Time::tz_initialized_ = false;
+TIME_ZONE_INFORMATION Time::tzinfo_;
+char Time::std_tz_name_[kTzNameSize];
+char Time::dst_tz_name_[kTzNameSize];
+
+
+// Initialize timestamp to start of epoc.
+Time::Time() {
+  t() = 0;
+}
+
+
+// Initialize timestamp from a JavaScript timestamp.
+Time::Time(double jstime) {
+  t() = static_cast<int64_t>(jstime) * kTimeScaler + kTimeEpoc;
+}
+
+
+// Initialize timestamp from date/time components.
+Time::Time(int year, int mon, int day, int hour, int min, int sec) {
+  SYSTEMTIME st;
+  st.wYear = year;
+  st.wMonth = mon;
+  st.wDay = day;
+  st.wHour = hour;
+  st.wMinute = min;
+  st.wSecond = sec;
+  st.wMilliseconds = 0;
+  SystemTimeToFileTime(&st, &ft());
+}
+
+
+// Convert timestamp to JavaScript timestamp.
+double Time::ToJSTime() {
+  return static_cast<double>((t() - kTimeEpoc) / kTimeScaler);
+}
+
+
+// Guess the name of the timezone from the bias.
+// The guess is very biased towards the northern hemisphere.
+const char* Time::GuessTimezoneNameFromBias(int bias) {
+  static const int kHour = 60;
+  switch (-bias) {
+    case -9*kHour: return "Alaska";
+    case -8*kHour: return "Pacific";
+    case -7*kHour: return "Mountain";
+    case -6*kHour: return "Central";
+    case -5*kHour: return "Eastern";
+    case -4*kHour: return "Atlantic";
+    case  0*kHour: return "GMT";
+    case +1*kHour: return "Central Europe";
+    case +2*kHour: return "Eastern Europe";
+    case +3*kHour: return "Russia";
+    case +5*kHour + 30: return "India";
+    case +8*kHour: return "China";
+    case +9*kHour: return "Japan";
+    case +12*kHour: return "New Zealand";
+    default: return "Local";
+  }
+}
+
+
+// Initialize timezone information. The timezone information is obtained from
+// windows. If we cannot get the timezone information we fall back to CET.
+// Please notice that this code is not thread-safe.
+void Time::TzSet() {
+  // Just return if timezone information has already been initialized.
+  if (tz_initialized_) return;
+
+  // Initialize POSIX time zone data.
+  _tzset();
+  // Obtain timezone information from operating system.
+  memset(&tzinfo_, 0, sizeof(tzinfo_));
+  if (GetTimeZoneInformation(&tzinfo_) == TIME_ZONE_ID_INVALID) {
+    // If we cannot get timezone information we fall back to CET.
+    tzinfo_.Bias = -60;
+    tzinfo_.StandardDate.wMonth = 10;
+    tzinfo_.StandardDate.wDay = 5;
+    tzinfo_.StandardDate.wHour = 3;
+    tzinfo_.StandardBias = 0;
+    tzinfo_.DaylightDate.wMonth = 3;
+    tzinfo_.DaylightDate.wDay = 5;
+    tzinfo_.DaylightDate.wHour = 2;
+    tzinfo_.DaylightBias = -60;
+  }
+
+  // Make standard and DST timezone names.
+  WideCharToMultiByte(CP_UTF8, 0, tzinfo_.StandardName, -1,
+                      std_tz_name_, kTzNameSize, NULL, NULL);
+  std_tz_name_[kTzNameSize - 1] = '\0';
+  WideCharToMultiByte(CP_UTF8, 0, tzinfo_.DaylightName, -1,
+                      dst_tz_name_, kTzNameSize, NULL, NULL);
+  dst_tz_name_[kTzNameSize - 1] = '\0';
+
+  // If OS returned empty string or resource id (like "@tzres.dll,-211")
+  // simply guess the name from the UTC bias of the timezone.
+  // To properly resolve the resource identifier requires a library load,
+  // which is not possible in a sandbox.
+  if (std_tz_name_[0] == '\0' || std_tz_name_[0] == '@') {
+    OS::SNPrintF(Vector<char>(std_tz_name_, kTzNameSize - 1),
+                 "%s Standard Time",
+                 GuessTimezoneNameFromBias(tzinfo_.Bias));
+  }
+  if (dst_tz_name_[0] == '\0' || dst_tz_name_[0] == '@') {
+    OS::SNPrintF(Vector<char>(dst_tz_name_, kTzNameSize - 1),
+                 "%s Daylight Time",
+                 GuessTimezoneNameFromBias(tzinfo_.Bias));
+  }
+
+  // Timezone information initialized.
+  tz_initialized_ = true;
+}
+
+
+// Return the difference in milliseconds between this and another timestamp.
+int64_t Time::Diff(Time* other) {
+  return (t() - other->t()) / kTimeScaler;
+}
+
+
+// Set timestamp to current time.
+void Time::SetToCurrentTime() {
+  // The default GetSystemTimeAsFileTime has a ~15.5ms resolution.
+  // Because we're fast, we like fast timers which have at least a
+  // 1ms resolution.
+  //
+  // timeGetTime() provides 1ms granularity when combined with
+  // timeBeginPeriod().  If the host application for v8 wants fast
+  // timers, it can use timeBeginPeriod to increase the resolution.
+  //
+  // Using timeGetTime() has a drawback because it is a 32bit value
+  // and hence rolls-over every ~49days.
+  //
+  // To use the clock, we use GetSystemTimeAsFileTime as our base;
+  // and then use timeGetTime to extrapolate current time from the
+  // start time.  To deal with rollovers, we resync the clock
+  // any time when more than kMaxClockElapsedTime has passed or
+  // whenever timeGetTime creates a rollover.
+
+  static bool initialized = false;
+  static TimeStamp init_time;
+  static DWORD init_ticks;
+  static const int64_t kHundredNanosecondsPerSecond = 10000000;
+  static const int64_t kMaxClockElapsedTime =
+      60*kHundredNanosecondsPerSecond;  // 1 minute
+
+  // If we are uninitialized, we need to resync the clock.
+  bool needs_resync = !initialized;
+
+  // Get the current time.
+  TimeStamp time_now;
+  GetSystemTimeAsFileTime(&time_now.ft_);
+  DWORD ticks_now = timeGetTime();
+
+  // Check if we need to resync due to clock rollover.
+  needs_resync |= ticks_now < init_ticks;
+
+  // Check if we need to resync due to elapsed time.
+  needs_resync |= (time_now.t_ - init_time.t_) > kMaxClockElapsedTime;
+
+  // Resync the clock if necessary.
+  if (needs_resync) {
+    GetSystemTimeAsFileTime(&init_time.ft_);
+    init_ticks = ticks_now = timeGetTime();
+    initialized = true;
+  }
+
+  // Finally, compute the actual time.  Why is this so hard.
+  DWORD elapsed = ticks_now - init_ticks;
+  this->time_.t_ = init_time.t_ + (static_cast<int64_t>(elapsed) * 10000);
+}
+
+
+// Return the local timezone offset in milliseconds east of UTC. This
+// takes into account whether daylight saving is in effect at the time.
+// Only times in the 32-bit Unix range may be passed to this function.
+// Also, adding the time-zone offset to the input must not overflow.
+// The function EquivalentTime() in date.js guarantees this.
+int64_t Time::LocalOffset() {
+  // Initialize timezone information, if needed.
+  TzSet();
+
+  Time rounded_to_second(*this);
+  rounded_to_second.t() = rounded_to_second.t() / 1000 / kTimeScaler *
+      1000 * kTimeScaler;
+  // Convert to local time using POSIX localtime function.
+  // Windows XP Service Pack 3 made SystemTimeToTzSpecificLocalTime()
+  // very slow.  Other browsers use localtime().
+
+  // Convert from JavaScript milliseconds past 1/1/1970 0:00:00 to
+  // POSIX seconds past 1/1/1970 0:00:00.
+  double unchecked_posix_time = rounded_to_second.ToJSTime() / 1000;
+  if (unchecked_posix_time > INT_MAX || unchecked_posix_time < 0) {
+    return 0;
+  }
+  // Because _USE_32BIT_TIME_T is defined, time_t is a 32-bit int.
+  time_t posix_time = static_cast<time_t>(unchecked_posix_time);
+
+  // Convert to local time, as struct with fields for day, hour, year, etc.
+  tm posix_local_time_struct;
+  if (localtime_s(&posix_local_time_struct, &posix_time)) return 0;
+  // Convert local time in struct to POSIX time as if it were a UTC time.
+  time_t local_posix_time = _mkgmtime(&posix_local_time_struct);
+  Time localtime(1000.0 * local_posix_time);
+
+  return localtime.Diff(&rounded_to_second);
+}
+
+
+// Return whether or not daylight savings time is in effect at this time.
+bool Time::InDST() {
+  // Initialize timezone information, if needed.
+  TzSet();
+
+  // Determine if DST is in effect at the specified time.
+  bool in_dst = false;
+  if (tzinfo_.StandardDate.wMonth != 0 || tzinfo_.DaylightDate.wMonth != 0) {
+    // Get the local timezone offset for the timestamp in milliseconds.
+    int64_t offset = LocalOffset();
+
+    // Compute the offset for DST. The bias parameters in the timezone info
+    // are specified in minutes. These must be converted to milliseconds.
+    int64_t dstofs = -(tzinfo_.Bias + tzinfo_.DaylightBias) * kMsPerMinute;
+
+    // If the local time offset equals the timezone bias plus the daylight
+    // bias then DST is in effect.
+    in_dst = offset == dstofs;
+  }
+
+  return in_dst;
+}
+
+
+// Return the daylight savings time offset for this time.
+int64_t Time::DaylightSavingsOffset() {
+  return InDST() ? 60 * kMsPerMinute : 0;
+}
+
+
+// Returns a string identifying the current timezone for the
+// timestamp taking into account daylight saving.
+char* Time::LocalTimezone() {
+  // Return the standard or DST time zone name based on whether daylight
+  // saving is in effect at the given time.
+  return InDST() ? dst_tz_name_ : std_tz_name_;
+}
+
+
+void OS::Setup() {
+  // Seed the random number generator.
+  // Convert the current time to a 64-bit integer first, before converting it
+  // to an unsigned. Going directly can cause an overflow and the seed to be
+  // set to all ones. The seed will be identical for different instances that
+  // call this setup code within the same millisecond.
+  uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis());
+  srand(static_cast<unsigned int>(seed));
+  limit_mutex = CreateMutex();
+}
+
+
+// Returns the accumulated user time for thread.
+int OS::GetUserTime(uint32_t* secs,  uint32_t* usecs) {
+  FILETIME dummy;
+  uint64_t usertime;
+
+  // Get the amount of time that the thread has executed in user mode.
+  if (!GetThreadTimes(GetCurrentThread(), &dummy, &dummy, &dummy,
+                      reinterpret_cast<FILETIME*>(&usertime))) return -1;
+
+  // Adjust the resolution to micro-seconds.
+  usertime /= 10;
+
+  // Convert to seconds and microseconds
+  *secs = static_cast<uint32_t>(usertime / 1000000);
+  *usecs = static_cast<uint32_t>(usertime % 1000000);
+  return 0;
+}
+
+
+// Returns current time as the number of milliseconds since
+// 00:00:00 UTC, January 1, 1970.
+double OS::TimeCurrentMillis() {
+  Time t;
+  t.SetToCurrentTime();
+  return t.ToJSTime();
+}
+
+// Returns the tickcounter based on timeGetTime.
+int64_t OS::Ticks() {
+  return timeGetTime() * 1000;  // Convert to microseconds.
+}
+
+
+// Returns a string identifying the current timezone taking into
+// account daylight saving.
+const char* OS::LocalTimezone(double time) {
+  return Time(time).LocalTimezone();
+}
+
+
+// Returns the local time offset in milliseconds east of UTC without
+// taking daylight savings time into account.
+double OS::LocalTimeOffset() {
+  // Use current time, rounded to the millisecond.
+  Time t(TimeCurrentMillis());
+  // Time::LocalOffset inlcudes any daylight savings offset, so subtract it.
+  return static_cast<double>(t.LocalOffset() - t.DaylightSavingsOffset());
+}
+
+
+// Returns the daylight savings offset in milliseconds for the given
+// time.
+double OS::DaylightSavingsOffset(double time) {
+  int64_t offset = Time(time).DaylightSavingsOffset();
+  return static_cast<double>(offset);
+}
+
+
+int OS::GetLastError() {
+  return ::GetLastError();
+}
+
+
+// ----------------------------------------------------------------------------
+// Win32 console output.
+//
+// If a Win32 application is linked as a console application it has a normal
+// standard output and standard error. In this case normal printf works fine
+// for output. However, if the application is linked as a GUI application,
+// the process doesn't have a console, and therefore (debugging) output is lost.
+// This is the case if we are embedded in a windows program (like a browser).
+// In order to be able to get debug output in this case the the debugging
+// facility using OutputDebugString. This output goes to the active debugger
+// for the process (if any). Else the output can be monitored using DBMON.EXE.
+
+enum OutputMode {
+  UNKNOWN,  // Output method has not yet been determined.
+  CONSOLE,  // Output is written to stdout.
+  ODS       // Output is written to debug facility.
+};
+
+static OutputMode output_mode = UNKNOWN;  // Current output mode.
+
+
+// Determine if the process has a console for output.
+static bool HasConsole() {
+  // Only check the first time. Eventual race conditions are not a problem,
+  // because all threads will eventually determine the same mode.
+  if (output_mode == UNKNOWN) {
+    // We cannot just check that the standard output is attached to a console
+    // because this would fail if output is redirected to a file. Therefore we
+    // say that a process does not have an output console if either the
+    // standard output handle is invalid or its file type is unknown.
+    if (GetStdHandle(STD_OUTPUT_HANDLE) != INVALID_HANDLE_VALUE &&
+        GetFileType(GetStdHandle(STD_OUTPUT_HANDLE)) != FILE_TYPE_UNKNOWN)
+      output_mode = CONSOLE;
+    else
+      output_mode = ODS;
+  }
+  return output_mode == CONSOLE;
+}
+
+
+static void VPrintHelper(FILE* stream, const char* format, va_list args) {
+  if (HasConsole()) {
+    vfprintf(stream, format, args);
+  } else {
+    // It is important to use safe print here in order to avoid
+    // overflowing the buffer. We might truncate the output, but this
+    // does not crash.
+    EmbeddedVector<char, 4096> buffer;
+    OS::VSNPrintF(buffer, format, args);
+    OutputDebugStringA(buffer.start());
+  }
+}
+
+
+FILE* OS::FOpen(const char* path, const char* mode) {
+  FILE* result;
+  if (fopen_s(&result, path, mode) == 0) {
+    return result;
+  } else {
+    return NULL;
+  }
+}
+
+
+bool OS::Remove(const char* path) {
+  return (DeleteFileA(path) != 0);
+}
+
+
+FILE* OS::OpenTemporaryFile() {
+  // tmpfile_s tries to use the root dir, don't use it.
+  char tempPathBuffer[MAX_PATH];
+  DWORD path_result = 0;
+  path_result = GetTempPathA(MAX_PATH, tempPathBuffer);
+  if (path_result > MAX_PATH || path_result == 0) return NULL;
+  UINT name_result = 0;
+  char tempNameBuffer[MAX_PATH];
+  name_result = GetTempFileNameA(tempPathBuffer, "", 0, tempNameBuffer);
+  if (name_result == 0) return NULL;
+  FILE* result = FOpen(tempNameBuffer, "w+");  // Same mode as tmpfile uses.
+  if (result != NULL) {
+    Remove(tempNameBuffer);  // Delete on close.
+  }
+  return result;
+}
+
+
+// Open log file in binary mode to avoid /n -> /r/n conversion.
+const char* const OS::LogFileOpenMode = "wb";
+
+
+// Print (debug) message to console.
+void OS::Print(const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  VPrint(format, args);
+  va_end(args);
+}
+
+
+void OS::VPrint(const char* format, va_list args) {
+  VPrintHelper(stdout, format, args);
+}
+
+
+void OS::FPrint(FILE* out, const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  VFPrint(out, format, args);
+  va_end(args);
+}
+
+
+void OS::VFPrint(FILE* out, const char* format, va_list args) {
+  VPrintHelper(out, format, args);
+}
+
+
+// Print error message to console.
+void OS::PrintError(const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  VPrintError(format, args);
+  va_end(args);
+}
+
+
+void OS::VPrintError(const char* format, va_list args) {
+  VPrintHelper(stderr, format, args);
+}
+
+
+int OS::SNPrintF(Vector<char> str, const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  int result = VSNPrintF(str, format, args);
+  va_end(args);
+  return result;
+}
+
+
+int OS::VSNPrintF(Vector<char> str, const char* format, va_list args) {
+  int n = _vsnprintf_s(str.start(), str.length(), _TRUNCATE, format, args);
+  // Make sure to zero-terminate the string if the output was
+  // truncated or if there was an error.
+  if (n < 0 || n >= str.length()) {
+    if (str.length() > 0)
+      str[str.length() - 1] = '\0';
+    return -1;
+  } else {
+    return n;
+  }
+}
+
+
+char* OS::StrChr(char* str, int c) {
+  return const_cast<char*>(strchr(str, c));
+}
+
+
+void OS::StrNCpy(Vector<char> dest, const char* src, size_t n) {
+  // Use _TRUNCATE or strncpy_s crashes (by design) if buffer is too small.
+  size_t buffer_size = static_cast<size_t>(dest.length());
+  if (n + 1 > buffer_size)  // count for trailing '\0'
+    n = _TRUNCATE;
+  int result = strncpy_s(dest.start(), dest.length(), src, n);
+  USE(result);
+  ASSERT(result == 0 || (n == _TRUNCATE && result == STRUNCATE));
+}
+
+
+// We keep the lowest and highest addresses mapped as a quick way of
+// determining that pointers are outside the heap (used mostly in assertions
+// and verification).  The estimate is conservative, ie, not all addresses in
+// 'allocated' space are actually allocated to our heap.  The range is
+// [lowest, highest), inclusive on the low and and exclusive on the high end.
+static void* lowest_ever_allocated = reinterpret_cast<void*>(-1);
+static void* highest_ever_allocated = reinterpret_cast<void*>(0);
+
+
+static void UpdateAllocatedSpaceLimits(void* address, int size) {
+  ASSERT(limit_mutex != NULL);
+  ScopedLock lock(limit_mutex);
+
+  lowest_ever_allocated = Min(lowest_ever_allocated, address);
+  highest_ever_allocated =
+      Max(highest_ever_allocated,
+          reinterpret_cast<void*>(reinterpret_cast<char*>(address) + size));
+}
+
+
+bool OS::IsOutsideAllocatedSpace(void* pointer) {
+  if (pointer < lowest_ever_allocated || pointer >= highest_ever_allocated)
+    return true;
+  // Ask the Windows API
+  if (IsBadWritePtr(pointer, 1))
+    return true;
+  return false;
+}
+
+
+// Get the system's page size used by VirtualAlloc() or the next power
+// of two. The reason for always returning a power of two is that the
+// rounding up in OS::Allocate expects that.
+static size_t GetPageSize() {
+  static size_t page_size = 0;
+  if (page_size == 0) {
+    SYSTEM_INFO info;
+    GetSystemInfo(&info);
+    page_size = RoundUpToPowerOf2(info.dwPageSize);
+  }
+  return page_size;
+}
+
+
+// The allocation alignment is the guaranteed alignment for
+// VirtualAlloc'ed blocks of memory.
+size_t OS::AllocateAlignment() {
+  static size_t allocate_alignment = 0;
+  if (allocate_alignment == 0) {
+    SYSTEM_INFO info;
+    GetSystemInfo(&info);
+    allocate_alignment = info.dwAllocationGranularity;
+  }
+  return allocate_alignment;
+}
+
+
+void* OS::Allocate(const size_t requested,
+                   size_t* allocated,
+                   bool is_executable) {
+  // The address range used to randomize RWX allocations in OS::Allocate
+  // Try not to map pages into the default range that windows loads DLLs
+  // Use a multiple of 64k to prevent committing unused memory.
+  // Note: This does not guarantee RWX regions will be within the
+  // range kAllocationRandomAddressMin to kAllocationRandomAddressMax
+#ifdef V8_HOST_ARCH_64_BIT
+  static const intptr_t kAllocationRandomAddressMin = 0x0000000080000000;
+  static const intptr_t kAllocationRandomAddressMax = 0x000003FFFFFF0000;
+#else
+  static const intptr_t kAllocationRandomAddressMin = 0x04000000;
+  static const intptr_t kAllocationRandomAddressMax = 0x3FFF0000;
+#endif
+
+  // VirtualAlloc rounds allocated size to page size automatically.
+  size_t msize = RoundUp(requested, static_cast<int>(GetPageSize()));
+  intptr_t address = 0;
+
+  // Windows XP SP2 allows Data Excution Prevention (DEP).
+  int prot = is_executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
+
+  // For exectutable pages try and randomize the allocation address
+  if (prot == PAGE_EXECUTE_READWRITE &&
+      msize >= static_cast<size_t>(Page::kPageSize)) {
+    address = (V8::RandomPrivate(Isolate::Current()) << kPageSizeBits)
+      | kAllocationRandomAddressMin;
+    address &= kAllocationRandomAddressMax;
+  }
+
+  LPVOID mbase = VirtualAlloc(reinterpret_cast<void *>(address),
+                              msize,
+                              MEM_COMMIT | MEM_RESERVE,
+                              prot);
+  if (mbase == NULL && address != 0)
+    mbase = VirtualAlloc(NULL, msize, MEM_COMMIT | MEM_RESERVE, prot);
+
+  if (mbase == NULL) {
+    LOG(ISOLATE, StringEvent("OS::Allocate", "VirtualAlloc failed"));
+    return NULL;
+  }
+
+  ASSERT(IsAligned(reinterpret_cast<size_t>(mbase), OS::AllocateAlignment()));
+
+  *allocated = msize;
+  UpdateAllocatedSpaceLimits(mbase, static_cast<int>(msize));
+  return mbase;
+}
+
+
+void OS::Free(void* address, const size_t size) {
+  // TODO(1240712): VirtualFree has a return value which is ignored here.
+  VirtualFree(address, 0, MEM_RELEASE);
+  USE(size);
+}
+
+
+void OS::ProtectCode(void* address, const size_t size) {
+  DWORD old_protect;
+  VirtualProtect(address, size, PAGE_EXECUTE_READ, &old_protect);
+}
+
+
+void OS::Guard(void* address, const size_t size) {
+  DWORD oldprotect;
+  VirtualProtect(address, size, PAGE_READONLY | PAGE_GUARD, &oldprotect);
+}
+
+
+void OS::Sleep(int milliseconds) {
+  ::Sleep(milliseconds);
+}
+
+
+void OS::Abort() {
+  if (!IsDebuggerPresent()) {
+#ifdef _MSC_VER
+    // Make the MSVCRT do a silent abort.
+    _set_abort_behavior(0, _WRITE_ABORT_MSG);
+    _set_abort_behavior(0, _CALL_REPORTFAULT);
+#endif  // _MSC_VER
+    abort();
+  } else {
+    DebugBreak();
+  }
+}
+
+
+void OS::DebugBreak() {
+#ifdef _MSC_VER
+  __debugbreak();
+#else
+  ::DebugBreak();
+#endif
+}
+
+
+class Win32MemoryMappedFile : public OS::MemoryMappedFile {
+ public:
+  Win32MemoryMappedFile(HANDLE file,
+                        HANDLE file_mapping,
+                        void* memory,
+                        int size)
+      : file_(file),
+        file_mapping_(file_mapping),
+        memory_(memory),
+        size_(size) { }
+  virtual ~Win32MemoryMappedFile();
+  virtual void* memory() { return memory_; }
+  virtual int size() { return size_; }
+ private:
+  HANDLE file_;
+  HANDLE file_mapping_;
+  void* memory_;
+  int size_;
+};
+
+
+OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) {
+  // Open a physical file
+  HANDLE file = CreateFileA(name, GENERIC_READ | GENERIC_WRITE,
+      FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
+  if (file == INVALID_HANDLE_VALUE) return NULL;
+
+  int size = static_cast<int>(GetFileSize(file, NULL));
+
+  // Create a file mapping for the physical file
+  HANDLE file_mapping = CreateFileMapping(file, NULL,
+      PAGE_READWRITE, 0, static_cast<DWORD>(size), NULL);
+  if (file_mapping == NULL) return NULL;
+
+  // Map a view of the file into memory
+  void* memory = MapViewOfFile(file_mapping, FILE_MAP_ALL_ACCESS, 0, 0, size);
+  return new Win32MemoryMappedFile(file, file_mapping, memory, size);
+}
+
+
+OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size,
+    void* initial) {
+  // Open a physical file
+  HANDLE file = CreateFileA(name, GENERIC_READ | GENERIC_WRITE,
+      FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_ALWAYS, 0, NULL);
+  if (file == NULL) return NULL;
+  // Create a file mapping for the physical file
+  HANDLE file_mapping = CreateFileMapping(file, NULL,
+      PAGE_READWRITE, 0, static_cast<DWORD>(size), NULL);
+  if (file_mapping == NULL) return NULL;
+  // Map a view of the file into memory
+  void* memory = MapViewOfFile(file_mapping, FILE_MAP_ALL_ACCESS, 0, 0, size);
+  if (memory) memmove(memory, initial, size);
+  return new Win32MemoryMappedFile(file, file_mapping, memory, size);
+}
+
+
+Win32MemoryMappedFile::~Win32MemoryMappedFile() {
+  if (memory_ != NULL)
+    UnmapViewOfFile(memory_);
+  CloseHandle(file_mapping_);
+  CloseHandle(file_);
+}
+
+
+// The following code loads functions defined in DbhHelp.h and TlHelp32.h
+// dynamically. This is to avoid being depending on dbghelp.dll and
+// tlhelp32.dll when running (the functions in tlhelp32.dll have been moved to
+// kernel32.dll at some point so loading functions defines in TlHelp32.h
+// dynamically might not be necessary any more - for some versions of Windows?).
+
+// Function pointers to functions dynamically loaded from dbghelp.dll.
+#define DBGHELP_FUNCTION_LIST(V)  \
+  V(SymInitialize)                \
+  V(SymGetOptions)                \
+  V(SymSetOptions)                \
+  V(SymGetSearchPath)             \
+  V(SymLoadModule64)              \
+  V(StackWalk64)                  \
+  V(SymGetSymFromAddr64)          \
+  V(SymGetLineFromAddr64)         \
+  V(SymFunctionTableAccess64)     \
+  V(SymGetModuleBase64)
+
+// Function pointers to functions dynamically loaded from dbghelp.dll.
+#define TLHELP32_FUNCTION_LIST(V)  \
+  V(CreateToolhelp32Snapshot)      \
+  V(Module32FirstW)                \
+  V(Module32NextW)
+
+// Define the decoration to use for the type and variable name used for
+// dynamically loaded DLL function..
+#define DLL_FUNC_TYPE(name) _##name##_
+#define DLL_FUNC_VAR(name) _##name
+
+// Define the type for each dynamically loaded DLL function. The function
+// definitions are copied from DbgHelp.h and TlHelp32.h. The IN and VOID macros
+// from the Windows include files are redefined here to have the function
+// definitions to be as close to the ones in the original .h files as possible.
+#ifndef IN
+#define IN
+#endif
+#ifndef VOID
+#define VOID void
+#endif
+
+// DbgHelp isn't supported on MinGW yet
+#ifndef __MINGW32__
+// DbgHelp.h functions.
+typedef BOOL (__stdcall *DLL_FUNC_TYPE(SymInitialize))(IN HANDLE hProcess,
+                                                       IN PSTR UserSearchPath,
+                                                       IN BOOL fInvadeProcess);
+typedef DWORD (__stdcall *DLL_FUNC_TYPE(SymGetOptions))(VOID);
+typedef DWORD (__stdcall *DLL_FUNC_TYPE(SymSetOptions))(IN DWORD SymOptions);
+typedef BOOL (__stdcall *DLL_FUNC_TYPE(SymGetSearchPath))(
+    IN HANDLE hProcess,
+    OUT PSTR SearchPath,
+    IN DWORD SearchPathLength);
+typedef DWORD64 (__stdcall *DLL_FUNC_TYPE(SymLoadModule64))(
+    IN HANDLE hProcess,
+    IN HANDLE hFile,
+    IN PSTR ImageName,
+    IN PSTR ModuleName,
+    IN DWORD64 BaseOfDll,
+    IN DWORD SizeOfDll);
+typedef BOOL (__stdcall *DLL_FUNC_TYPE(StackWalk64))(
+    DWORD MachineType,
+    HANDLE hProcess,
+    HANDLE hThread,
+    LPSTACKFRAME64 StackFrame,
+    PVOID ContextRecord,
+    PREAD_PROCESS_MEMORY_ROUTINE64 ReadMemoryRoutine,
+    PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
+    PGET_MODULE_BASE_ROUTINE64 GetModuleBaseRoutine,
+    PTRANSLATE_ADDRESS_ROUTINE64 TranslateAddress);
+typedef BOOL (__stdcall *DLL_FUNC_TYPE(SymGetSymFromAddr64))(
+    IN HANDLE hProcess,
+    IN DWORD64 qwAddr,
+    OUT PDWORD64 pdwDisplacement,
+    OUT PIMAGEHLP_SYMBOL64 Symbol);
+typedef BOOL (__stdcall *DLL_FUNC_TYPE(SymGetLineFromAddr64))(
+    IN HANDLE hProcess,
+    IN DWORD64 qwAddr,
+    OUT PDWORD pdwDisplacement,
+    OUT PIMAGEHLP_LINE64 Line64);
+// DbgHelp.h typedefs. Implementation found in dbghelp.dll.
+typedef PVOID (__stdcall *DLL_FUNC_TYPE(SymFunctionTableAccess64))(
+    HANDLE hProcess,
+    DWORD64 AddrBase);  // DbgHelp.h typedef PFUNCTION_TABLE_ACCESS_ROUTINE64
+typedef DWORD64 (__stdcall *DLL_FUNC_TYPE(SymGetModuleBase64))(
+    HANDLE hProcess,
+    DWORD64 AddrBase);  // DbgHelp.h typedef PGET_MODULE_BASE_ROUTINE64
+
+// TlHelp32.h functions.
+typedef HANDLE (__stdcall *DLL_FUNC_TYPE(CreateToolhelp32Snapshot))(
+    DWORD dwFlags,
+    DWORD th32ProcessID);
+typedef BOOL (__stdcall *DLL_FUNC_TYPE(Module32FirstW))(HANDLE hSnapshot,
+                                                        LPMODULEENTRY32W lpme);
+typedef BOOL (__stdcall *DLL_FUNC_TYPE(Module32NextW))(HANDLE hSnapshot,
+                                                       LPMODULEENTRY32W lpme);
+
+#undef IN
+#undef VOID
+
+// Declare a variable for each dynamically loaded DLL function.
+#define DEF_DLL_FUNCTION(name) DLL_FUNC_TYPE(name) DLL_FUNC_VAR(name) = NULL;
+DBGHELP_FUNCTION_LIST(DEF_DLL_FUNCTION)
+TLHELP32_FUNCTION_LIST(DEF_DLL_FUNCTION)
+#undef DEF_DLL_FUNCTION
+
+// Load the functions. This function has a lot of "ugly" macros in order to
+// keep down code duplication.
+
+static bool LoadDbgHelpAndTlHelp32() {
+  static bool dbghelp_loaded = false;
+
+  if (dbghelp_loaded) return true;
+
+  HMODULE module;
+
+  // Load functions from the dbghelp.dll module.
+  module = LoadLibrary(TEXT("dbghelp.dll"));
+  if (module == NULL) {
+    return false;
+  }
+
+#define LOAD_DLL_FUNC(name)                                                 \
+  DLL_FUNC_VAR(name) =                                                      \
+      reinterpret_cast<DLL_FUNC_TYPE(name)>(GetProcAddress(module, #name));
+
+DBGHELP_FUNCTION_LIST(LOAD_DLL_FUNC)
+
+#undef LOAD_DLL_FUNC
+
+  // Load functions from the kernel32.dll module (the TlHelp32.h function used
+  // to be in tlhelp32.dll but are now moved to kernel32.dll).
+  module = LoadLibrary(TEXT("kernel32.dll"));
+  if (module == NULL) {
+    return false;
+  }
+
+#define LOAD_DLL_FUNC(name)                                                 \
+  DLL_FUNC_VAR(name) =                                                      \
+      reinterpret_cast<DLL_FUNC_TYPE(name)>(GetProcAddress(module, #name));
+
+TLHELP32_FUNCTION_LIST(LOAD_DLL_FUNC)
+
+#undef LOAD_DLL_FUNC
+
+  // Check that all functions where loaded.
+  bool result =
+#define DLL_FUNC_LOADED(name) (DLL_FUNC_VAR(name) != NULL) &&
+
+DBGHELP_FUNCTION_LIST(DLL_FUNC_LOADED)
+TLHELP32_FUNCTION_LIST(DLL_FUNC_LOADED)
+
+#undef DLL_FUNC_LOADED
+  true;
+
+  dbghelp_loaded = result;
+  return result;
+  // NOTE: The modules are never unloaded and will stay around until the
+  // application is closed.
+}
+
+
+// Load the symbols for generating stack traces.
+static bool LoadSymbols(HANDLE process_handle) {
+  static bool symbols_loaded = false;
+
+  if (symbols_loaded) return true;
+
+  BOOL ok;
+
+  // Initialize the symbol engine.
+  ok = _SymInitialize(process_handle,  // hProcess
+                      NULL,            // UserSearchPath
+                      false);          // fInvadeProcess
+  if (!ok) return false;
+
+  DWORD options = _SymGetOptions();
+  options |= SYMOPT_LOAD_LINES;
+  options |= SYMOPT_FAIL_CRITICAL_ERRORS;
+  options = _SymSetOptions(options);
+
+  char buf[OS::kStackWalkMaxNameLen] = {0};
+  ok = _SymGetSearchPath(process_handle, buf, OS::kStackWalkMaxNameLen);
+  if (!ok) {
+    int err = GetLastError();
+    PrintF("%d\n", err);
+    return false;
+  }
+
+  HANDLE snapshot = _CreateToolhelp32Snapshot(
+      TH32CS_SNAPMODULE,       // dwFlags
+      GetCurrentProcessId());  // th32ProcessId
+  if (snapshot == INVALID_HANDLE_VALUE) return false;
+  MODULEENTRY32W module_entry;
+  module_entry.dwSize = sizeof(module_entry);  // Set the size of the structure.
+  BOOL cont = _Module32FirstW(snapshot, &module_entry);
+  while (cont) {
+    DWORD64 base;
+    // NOTE the SymLoadModule64 function has the peculiarity of accepting a
+    // both unicode and ASCII strings even though the parameter is PSTR.
+    base = _SymLoadModule64(
+        process_handle,                                       // hProcess
+        0,                                                    // hFile
+        reinterpret_cast<PSTR>(module_entry.szExePath),       // ImageName
+        reinterpret_cast<PSTR>(module_entry.szModule),        // ModuleName
+        reinterpret_cast<DWORD64>(module_entry.modBaseAddr),  // BaseOfDll
+        module_entry.modBaseSize);                            // SizeOfDll
+    if (base == 0) {
+      int err = GetLastError();
+      if (err != ERROR_MOD_NOT_FOUND &&
+          err != ERROR_INVALID_HANDLE) return false;
+    }
+    LOG(i::Isolate::Current(),
+        SharedLibraryEvent(
+            module_entry.szExePath,
+            reinterpret_cast<unsigned int>(module_entry.modBaseAddr),
+            reinterpret_cast<unsigned int>(module_entry.modBaseAddr +
+                                           module_entry.modBaseSize)));
+    cont = _Module32NextW(snapshot, &module_entry);
+  }
+  CloseHandle(snapshot);
+
+  symbols_loaded = true;
+  return true;
+}
+
+
+void OS::LogSharedLibraryAddresses() {
+  // SharedLibraryEvents are logged when loading symbol information.
+  // Only the shared libraries loaded at the time of the call to
+  // LogSharedLibraryAddresses are logged.  DLLs loaded after
+  // initialization are not accounted for.
+  if (!LoadDbgHelpAndTlHelp32()) return;
+  HANDLE process_handle = GetCurrentProcess();
+  LoadSymbols(process_handle);
+}
+
+
+void OS::SignalCodeMovingGC() {
+}
+
+
+// Walk the stack using the facilities in dbghelp.dll and tlhelp32.dll
+
+// Switch off warning 4748 (/GS can not protect parameters and local variables
+// from local buffer overrun because optimizations are disabled in function) as
+// it is triggered by the use of inline assembler.
+#pragma warning(push)
+#pragma warning(disable : 4748)
+int OS::StackWalk(Vector<OS::StackFrame> frames) {
+  BOOL ok;
+
+  // Load the required functions from DLL's.
+  if (!LoadDbgHelpAndTlHelp32()) return kStackWalkError;
+
+  // Get the process and thread handles.
+  HANDLE process_handle = GetCurrentProcess();
+  HANDLE thread_handle = GetCurrentThread();
+
+  // Read the symbols.
+  if (!LoadSymbols(process_handle)) return kStackWalkError;
+
+  // Capture current context.
+  CONTEXT context;
+  RtlCaptureContext(&context);
+
+  // Initialize the stack walking
+  STACKFRAME64 stack_frame;
+  memset(&stack_frame, 0, sizeof(stack_frame));
+#ifdef  _WIN64
+  stack_frame.AddrPC.Offset = context.Rip;
+  stack_frame.AddrFrame.Offset = context.Rbp;
+  stack_frame.AddrStack.Offset = context.Rsp;
+#else
+  stack_frame.AddrPC.Offset = context.Eip;
+  stack_frame.AddrFrame.Offset = context.Ebp;
+  stack_frame.AddrStack.Offset = context.Esp;
+#endif
+  stack_frame.AddrPC.Mode = AddrModeFlat;
+  stack_frame.AddrFrame.Mode = AddrModeFlat;
+  stack_frame.AddrStack.Mode = AddrModeFlat;
+  int frames_count = 0;
+
+  // Collect stack frames.
+  int frames_size = frames.length();
+  while (frames_count < frames_size) {
+    ok = _StackWalk64(
+        IMAGE_FILE_MACHINE_I386,    // MachineType
+        process_handle,             // hProcess
+        thread_handle,              // hThread
+        &stack_frame,               // StackFrame
+        &context,                   // ContextRecord
+        NULL,                       // ReadMemoryRoutine
+        _SymFunctionTableAccess64,  // FunctionTableAccessRoutine
+        _SymGetModuleBase64,        // GetModuleBaseRoutine
+        NULL);                      // TranslateAddress
+    if (!ok) break;
+
+    // Store the address.
+    ASSERT((stack_frame.AddrPC.Offset >> 32) == 0);  // 32-bit address.
+    frames[frames_count].address =
+        reinterpret_cast<void*>(stack_frame.AddrPC.Offset);
+
+    // Try to locate a symbol for this frame.
+    DWORD64 symbol_displacement;
+    SmartArrayPointer<IMAGEHLP_SYMBOL64> symbol(
+        NewArray<IMAGEHLP_SYMBOL64>(kStackWalkMaxNameLen));
+    if (symbol.is_empty()) return kStackWalkError;  // Out of memory.
+    memset(*symbol, 0, sizeof(IMAGEHLP_SYMBOL64) + kStackWalkMaxNameLen);
+    (*symbol)->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
+    (*symbol)->MaxNameLength = kStackWalkMaxNameLen;
+    ok = _SymGetSymFromAddr64(process_handle,             // hProcess
+                              stack_frame.AddrPC.Offset,  // Address
+                              &symbol_displacement,       // Displacement
+                              *symbol);                   // Symbol
+    if (ok) {
+      // Try to locate more source information for the symbol.
+      IMAGEHLP_LINE64 Line;
+      memset(&Line, 0, sizeof(Line));
+      Line.SizeOfStruct = sizeof(Line);
+      DWORD line_displacement;
+      ok = _SymGetLineFromAddr64(
+          process_handle,             // hProcess
+          stack_frame.AddrPC.Offset,  // dwAddr
+          &line_displacement,         // pdwDisplacement
+          &Line);                     // Line
+      // Format a text representation of the frame based on the information
+      // available.
+      if (ok) {
+        SNPrintF(MutableCStrVector(frames[frames_count].text,
+                                   kStackWalkMaxTextLen),
+                 "%s %s:%d:%d",
+                 (*symbol)->Name, Line.FileName, Line.LineNumber,
+                 line_displacement);
+      } else {
+        SNPrintF(MutableCStrVector(frames[frames_count].text,
+                                   kStackWalkMaxTextLen),
+                 "%s",
+                 (*symbol)->Name);
+      }
+      // Make sure line termination is in place.
+      frames[frames_count].text[kStackWalkMaxTextLen - 1] = '\0';
+    } else {
+      // No text representation of this frame
+      frames[frames_count].text[0] = '\0';
+
+      // Continue if we are just missing a module (for non C/C++ frames a
+      // module will never be found).
+      int err = GetLastError();
+      if (err != ERROR_MOD_NOT_FOUND) {
+        break;
+      }
+    }
+
+    frames_count++;
+  }
+
+  // Return the number of frames filled in.
+  return frames_count;
+}
+
+// Restore warnings to previous settings.
+#pragma warning(pop)
+
+#else  // __MINGW32__
+void OS::LogSharedLibraryAddresses() { }
+void OS::SignalCodeMovingGC() { }
+int OS::StackWalk(Vector<OS::StackFrame> frames) { return 0; }
+#endif  // __MINGW32__
+
+
+uint64_t OS::CpuFeaturesImpliedByPlatform() {
+  return 0;  // Windows runs on anything.
+}
+
+
+double OS::nan_value() {
+#ifdef _MSC_VER
+  // Positive Quiet NaN with no payload (aka. Indeterminate) has all bits
+  // in mask set, so value equals mask.
+  static const __int64 nanval = kQuietNaNMask;
+  return *reinterpret_cast<const double*>(&nanval);
+#else  // _MSC_VER
+  return NAN;
+#endif  // _MSC_VER
+}
+
+
+int OS::ActivationFrameAlignment() {
+#ifdef _WIN64
+  return 16;  // Windows 64-bit ABI requires the stack to be 16-byte aligned.
+#else
+  return 8;  // Floating-point math runs faster with 8-byte alignment.
+#endif
+}
+
+
+void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) {
+  MemoryBarrier();
+  *ptr = value;
+}
+
+
+VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { }
+
+
+VirtualMemory::VirtualMemory(size_t size)
+    : address_(ReserveRegion(size)), size_(size) { }
+
+
+VirtualMemory::VirtualMemory(size_t size, size_t alignment)
+    : address_(NULL), size_(0) {
+  ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment())));
+  size_t request_size = RoundUp(size + alignment,
+                                static_cast<intptr_t>(OS::AllocateAlignment()));
+  void* address = ReserveRegion(request_size);
+  if (address == NULL) return;
+  Address base = RoundUp(static_cast<Address>(address), alignment);
+  // Try reducing the size by freeing and then reallocating a specific area.
+  bool result = ReleaseRegion(address, request_size);
+  USE(result);
+  ASSERT(result);
+  address = VirtualAlloc(base, size, MEM_RESERVE, PAGE_NOACCESS);
+  if (address != NULL) {
+    request_size = size;
+    ASSERT(base == static_cast<Address>(address));
+  } else {
+    // Resizing failed, just go with a bigger area.
+    address = ReserveRegion(request_size);
+    if (address == NULL) return;
+  }
+  address_ = address;
+  size_ = request_size;
+}
+
+
+VirtualMemory::~VirtualMemory() {
+  if (IsReserved()) {
+    bool result = ReleaseRegion(address_, size_);
+    ASSERT(result);
+    USE(result);
+  }
+}
+
+
+bool VirtualMemory::IsReserved() {
+  return address_ != NULL;
+}
+
+
+void VirtualMemory::Reset() {
+  address_ = NULL;
+  size_ = 0;
+}
+
+
+bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) {
+  if (CommitRegion(address, size, is_executable)) {
+    UpdateAllocatedSpaceLimits(address, static_cast<int>(size));
+    return true;
+  }
+  return false;
+}
+
+
+bool VirtualMemory::Uncommit(void* address, size_t size) {
+  ASSERT(IsReserved());
+  return UncommitRegion(address, size);
+}
+
+
+void* VirtualMemory::ReserveRegion(size_t size) {
+  return VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS);
+}
+
+
+bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
+  int prot = is_executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
+  if (NULL == VirtualAlloc(base, size, MEM_COMMIT, prot)) {
+    return false;
+  }
+
+  UpdateAllocatedSpaceLimits(base, static_cast<int>(size));
+  return true;
+}
+
+
+bool VirtualMemory::UncommitRegion(void* base, size_t size) {
+  return VirtualFree(base, size, MEM_DECOMMIT) != 0;
+}
+
+
+bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
+  return VirtualFree(base, 0, MEM_RELEASE) != 0;
+}
+
+
+
+// ----------------------------------------------------------------------------
+// Win32 thread support.
+
+// Definition of invalid thread handle and id.
+static const HANDLE kNoThread = INVALID_HANDLE_VALUE;
+
+// Entry point for threads. The supplied argument is a pointer to the thread
+// object. The entry function dispatches to the run method in the thread
+// object. It is important that this function has __stdcall calling
+// convention.
+static unsigned int __stdcall ThreadEntry(void* arg) {
+  Thread* thread = reinterpret_cast<Thread*>(arg);
+  thread->Run();
+  return 0;
+}
+
+
+class Thread::PlatformData : public Malloced {
+ public:
+  explicit PlatformData(HANDLE thread) : thread_(thread) {}
+  HANDLE thread_;
+  unsigned thread_id_;
+};
+
+
+// Initialize a Win32 thread object. The thread has an invalid thread
+// handle until it is started.
+
+Thread::Thread(const Options& options)
+    : stack_size_(options.stack_size) {
+  data_ = new PlatformData(kNoThread);
+  set_name(options.name);
+}
+
+
+Thread::Thread(const char* name)
+    : stack_size_(0) {
+  data_ = new PlatformData(kNoThread);
+  set_name(name);
+}
+
+
+void Thread::set_name(const char* name) {
+  OS::StrNCpy(Vector<char>(name_, sizeof(name_)), name, strlen(name));
+  name_[sizeof(name_) - 1] = '\0';
+}
+
+
+// Close our own handle for the thread.
+Thread::~Thread() {
+  if (data_->thread_ != kNoThread) CloseHandle(data_->thread_);
+  delete data_;
+}
+
+
+// Create a new thread. It is important to use _beginthreadex() instead of
+// the Win32 function CreateThread(), because the CreateThread() does not
+// initialize thread specific structures in the C runtime library.
+void Thread::Start() {
+  data_->thread_ = reinterpret_cast<HANDLE>(
+      _beginthreadex(NULL,
+                     static_cast<unsigned>(stack_size_),
+                     ThreadEntry,
+                     this,
+                     0,
+                     &data_->thread_id_));
+}
+
+
+// Wait for thread to terminate.
+void Thread::Join() {
+  if (data_->thread_id_ != GetCurrentThreadId()) {
+    WaitForSingleObject(data_->thread_, INFINITE);
+  }
+}
+
+
+Thread::LocalStorageKey Thread::CreateThreadLocalKey() {
+  DWORD result = TlsAlloc();
+  ASSERT(result != TLS_OUT_OF_INDEXES);
+  return static_cast<LocalStorageKey>(result);
+}
+
+
+void Thread::DeleteThreadLocalKey(LocalStorageKey key) {
+  BOOL result = TlsFree(static_cast<DWORD>(key));
+  USE(result);
+  ASSERT(result);
+}
+
+
+void* Thread::GetThreadLocal(LocalStorageKey key) {
+  return TlsGetValue(static_cast<DWORD>(key));
+}
+
+
+void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
+  BOOL result = TlsSetValue(static_cast<DWORD>(key), value);
+  USE(result);
+  ASSERT(result);
+}
+
+
+
+void Thread::YieldCPU() {
+  Sleep(0);
+}
+
+
+// ----------------------------------------------------------------------------
+// Win32 mutex support.
+//
+// On Win32 mutexes are implemented using CRITICAL_SECTION objects. These are
+// faster than Win32 Mutex objects because they are implemented using user mode
+// atomic instructions. Therefore we only do ring transitions if there is lock
+// contention.
+
+class Win32Mutex : public Mutex {
+ public:
+  Win32Mutex() { InitializeCriticalSection(&cs_); }
+
+  virtual ~Win32Mutex() { DeleteCriticalSection(&cs_); }
+
+  virtual int Lock() {
+    EnterCriticalSection(&cs_);
+    return 0;
+  }
+
+  virtual int Unlock() {
+    LeaveCriticalSection(&cs_);
+    return 0;
+  }
+
+
+  virtual bool TryLock() {
+    // Returns non-zero if critical section is entered successfully entered.
+    return TryEnterCriticalSection(&cs_);
+  }
+
+ private:
+  CRITICAL_SECTION cs_;  // Critical section used for mutex
+};
+
+
+Mutex* OS::CreateMutex() {
+  return new Win32Mutex();
+}
+
+
+// ----------------------------------------------------------------------------
+// Win32 semaphore support.
+//
+// On Win32 semaphores are implemented using Win32 Semaphore objects. The
+// semaphores are anonymous. Also, the semaphores are initialized to have
+// no upper limit on count.
+
+
+class Win32Semaphore : public Semaphore {
+ public:
+  explicit Win32Semaphore(int count) {
+    sem = ::CreateSemaphoreA(NULL, count, 0x7fffffff, NULL);
+  }
+
+  ~Win32Semaphore() {
+    CloseHandle(sem);
+  }
+
+  void Wait() {
+    WaitForSingleObject(sem, INFINITE);
+  }
+
+  bool Wait(int timeout) {
+    // Timeout in Windows API is in milliseconds.
+    DWORD millis_timeout = timeout / 1000;
+    return WaitForSingleObject(sem, millis_timeout) != WAIT_TIMEOUT;
+  }
+
+  void Signal() {
+    LONG dummy;
+    ReleaseSemaphore(sem, 1, &dummy);
+  }
+
+ private:
+  HANDLE sem;
+};
+
+
+Semaphore* OS::CreateSemaphore(int count) {
+  return new Win32Semaphore(count);
+}
+
+
+// ----------------------------------------------------------------------------
+// Win32 socket support.
+//
+
+class Win32Socket : public Socket {
+ public:
+  explicit Win32Socket() {
+    // Create the socket.
+    socket_ = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+  }
+  explicit Win32Socket(SOCKET socket): socket_(socket) { }
+  virtual ~Win32Socket() { Shutdown(); }
+
+  // Server initialization.
+  bool Bind(const int port);
+  bool Listen(int backlog) const;
+  Socket* Accept() const;
+
+  // Client initialization.
+  bool Connect(const char* host, const char* port);
+
+  // Shutdown socket for both read and write.
+  bool Shutdown();
+
+  // Data Transimission
+  int Send(const char* data, int len) const;
+  int Receive(char* data, int len) const;
+
+  bool SetReuseAddress(bool reuse_address);
+
+  bool IsValid() const { return socket_ != INVALID_SOCKET; }
+
+ private:
+  SOCKET socket_;
+};
+
+
+bool Win32Socket::Bind(const int port) {
+  if (!IsValid())  {
+    return false;
+  }
+
+  sockaddr_in addr;
+  memset(&addr, 0, sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+  addr.sin_port = htons(port);
+  int status = bind(socket_,
+                    reinterpret_cast<struct sockaddr *>(&addr),
+                    sizeof(addr));
+  return status == 0;
+}
+
+
+bool Win32Socket::Listen(int backlog) const {
+  if (!IsValid()) {
+    return false;
+  }
+
+  int status = listen(socket_, backlog);
+  return status == 0;
+}
+
+
+Socket* Win32Socket::Accept() const {
+  if (!IsValid()) {
+    return NULL;
+  }
+
+  SOCKET socket = accept(socket_, NULL, NULL);
+  if (socket == INVALID_SOCKET) {
+    return NULL;
+  } else {
+    return new Win32Socket(socket);
+  }
+}
+
+
+bool Win32Socket::Connect(const char* host, const char* port) {
+  if (!IsValid()) {
+    return false;
+  }
+
+  // Lookup host and port.
+  struct addrinfo *result = NULL;
+  struct addrinfo hints;
+  memset(&hints, 0, sizeof(addrinfo));
+  hints.ai_family = AF_INET;
+  hints.ai_socktype = SOCK_STREAM;
+  hints.ai_protocol = IPPROTO_TCP;
+  int status = getaddrinfo(host, port, &hints, &result);
+  if (status != 0) {
+    return false;
+  }
+
+  // Connect.
+  status = connect(socket_,
+                   result->ai_addr,
+                   static_cast<int>(result->ai_addrlen));
+  freeaddrinfo(result);
+  return status == 0;
+}
+
+
+bool Win32Socket::Shutdown() {
+  if (IsValid()) {
+    // Shutdown socket for both read and write.
+    int status = shutdown(socket_, SD_BOTH);
+    closesocket(socket_);
+    socket_ = INVALID_SOCKET;
+    return status == SOCKET_ERROR;
+  }
+  return true;
+}
+
+
+int Win32Socket::Send(const char* data, int len) const {
+  int status = send(socket_, data, len, 0);
+  return status;
+}
+
+
+int Win32Socket::Receive(char* data, int len) const {
+  int status = recv(socket_, data, len, 0);
+  return status;
+}
+
+
+bool Win32Socket::SetReuseAddress(bool reuse_address) {
+  BOOL on = reuse_address ? true : false;
+  int status = setsockopt(socket_, SOL_SOCKET, SO_REUSEADDR,
+                          reinterpret_cast<char*>(&on), sizeof(on));
+  return status == SOCKET_ERROR;
+}
+
+
+bool Socket::Setup() {
+  // Initialize Winsock32
+  int err;
+  WSADATA winsock_data;
+  WORD version_requested = MAKEWORD(1, 0);
+  err = WSAStartup(version_requested, &winsock_data);
+  if (err != 0) {
+    PrintF("Unable to initialize Winsock, err = %d\n", Socket::LastError());
+  }
+
+  return err == 0;
+}
+
+
+int Socket::LastError() {
+  return WSAGetLastError();
+}
+
+
+uint16_t Socket::HToN(uint16_t value) {
+  return htons(value);
+}
+
+
+uint16_t Socket::NToH(uint16_t value) {
+  return ntohs(value);
+}
+
+
+uint32_t Socket::HToN(uint32_t value) {
+  return htonl(value);
+}
+
+
+uint32_t Socket::NToH(uint32_t value) {
+  return ntohl(value);
+}
+
+
+Socket* OS::CreateSocket() {
+  return new Win32Socket();
+}
+
+
+// ----------------------------------------------------------------------------
+// Win32 profiler support.
+
+class Sampler::PlatformData : public Malloced {
+ public:
+  // Get a handle to the calling thread. This is the thread that we are
+  // going to profile. We need to make a copy of the handle because we are
+  // going to use it in the sampler thread. Using GetThreadHandle() will
+  // not work in this case. We're using OpenThread because DuplicateHandle
+  // for some reason doesn't work in Chrome's sandbox.
+  PlatformData() : profiled_thread_(OpenThread(THREAD_GET_CONTEXT |
+                                               THREAD_SUSPEND_RESUME |
+                                               THREAD_QUERY_INFORMATION,
+                                               false,
+                                               GetCurrentThreadId())) {}
+
+  ~PlatformData() {
+    if (profiled_thread_ != NULL) {
+      CloseHandle(profiled_thread_);
+      profiled_thread_ = NULL;
+    }
+  }
+
+  HANDLE profiled_thread() { return profiled_thread_; }
+
+ private:
+  HANDLE profiled_thread_;
+};
+
+
+class SamplerThread : public Thread {
+ public:
+  explicit SamplerThread(int interval)
+      : Thread("SamplerThread"),
+        interval_(interval) {}
+
+  static void AddActiveSampler(Sampler* sampler) {
+    ScopedLock lock(mutex_);
+    SamplerRegistry::AddActiveSampler(sampler);
+    if (instance_ == NULL) {
+      instance_ = new SamplerThread(sampler->interval());
+      instance_->Start();
+    } else {
+      ASSERT(instance_->interval_ == sampler->interval());
+    }
+  }
+
+  static void RemoveActiveSampler(Sampler* sampler) {
+    ScopedLock lock(mutex_);
+    SamplerRegistry::RemoveActiveSampler(sampler);
+    if (SamplerRegistry::GetState() == SamplerRegistry::HAS_NO_SAMPLERS) {
+      RuntimeProfiler::StopRuntimeProfilerThreadBeforeShutdown(instance_);
+      delete instance_;
+      instance_ = NULL;
+    }
+  }
+
+  // Implement Thread::Run().
+  virtual void Run() {
+    SamplerRegistry::State state;
+    while ((state = SamplerRegistry::GetState()) !=
+           SamplerRegistry::HAS_NO_SAMPLERS) {
+      bool cpu_profiling_enabled =
+          (state == SamplerRegistry::HAS_CPU_PROFILING_SAMPLERS);
+      bool runtime_profiler_enabled = RuntimeProfiler::IsEnabled();
+      // When CPU profiling is enabled both JavaScript and C++ code is
+      // profiled. We must not suspend.
+      if (!cpu_profiling_enabled) {
+        if (rate_limiter_.SuspendIfNecessary()) continue;
+      }
+      if (cpu_profiling_enabled) {
+        if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this)) {
+          return;
+        }
+      }
+      if (runtime_profiler_enabled) {
+        if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, NULL)) {
+          return;
+        }
+      }
+      OS::Sleep(interval_);
+    }
+  }
+
+  static void DoCpuProfile(Sampler* sampler, void* raw_sampler_thread) {
+    if (!sampler->isolate()->IsInitialized()) return;
+    if (!sampler->IsProfiling()) return;
+    SamplerThread* sampler_thread =
+        reinterpret_cast<SamplerThread*>(raw_sampler_thread);
+    sampler_thread->SampleContext(sampler);
+  }
+
+  static void DoRuntimeProfile(Sampler* sampler, void* ignored) {
+    if (!sampler->isolate()->IsInitialized()) return;
+    sampler->isolate()->runtime_profiler()->NotifyTick();
+  }
+
+  void SampleContext(Sampler* sampler) {
+    HANDLE profiled_thread = sampler->platform_data()->profiled_thread();
+    if (profiled_thread == NULL) return;
+
+    // Context used for sampling the register state of the profiled thread.
+    CONTEXT context;
+    memset(&context, 0, sizeof(context));
+
+    TickSample sample_obj;
+    TickSample* sample = CpuProfiler::TickSampleEvent(sampler->isolate());
+    if (sample == NULL) sample = &sample_obj;
+
+    static const DWORD kSuspendFailed = static_cast<DWORD>(-1);
+    if (SuspendThread(profiled_thread) == kSuspendFailed) return;
+    sample->state = sampler->isolate()->current_vm_state();
+
+    context.ContextFlags = CONTEXT_FULL;
+    if (GetThreadContext(profiled_thread, &context) != 0) {
+#if V8_HOST_ARCH_X64
+      sample->pc = reinterpret_cast<Address>(context.Rip);
+      sample->sp = reinterpret_cast<Address>(context.Rsp);
+      sample->fp = reinterpret_cast<Address>(context.Rbp);
+#else
+      sample->pc = reinterpret_cast<Address>(context.Eip);
+      sample->sp = reinterpret_cast<Address>(context.Esp);
+      sample->fp = reinterpret_cast<Address>(context.Ebp);
+#endif
+      sampler->SampleStack(sample);
+      sampler->Tick(sample);
+    }
+    ResumeThread(profiled_thread);
+  }
+
+  const int interval_;
+  RuntimeProfilerRateLimiter rate_limiter_;
+
+  // Protects the process wide state below.
+  static Mutex* mutex_;
+  static SamplerThread* instance_;
+
+  DISALLOW_COPY_AND_ASSIGN(SamplerThread);
+};
+
+
+Mutex* SamplerThread::mutex_ = OS::CreateMutex();
+SamplerThread* SamplerThread::instance_ = NULL;
+
+
+Sampler::Sampler(Isolate* isolate, int interval)
+    : isolate_(isolate),
+      interval_(interval),
+      profiling_(false),
+      active_(false),
+      samples_taken_(0) {
+  data_ = new PlatformData;
+}
+
+
+Sampler::~Sampler() {
+  ASSERT(!IsActive());
+  delete data_;
+}
+
+
+void Sampler::Start() {
+  ASSERT(!IsActive());
+  SetActive(true);
+  SamplerThread::AddActiveSampler(this);
+}
+
+
+void Sampler::Stop() {
+  ASSERT(IsActive());
+  SamplerThread::RemoveActiveSampler(this);
+  SetActive(false);
+}
+
+
+} }  // namespace v8::internal