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// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Platform specific code for Win32.
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#define V8_WIN32_HEADERS_FULL
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#include "win32-headers.h"
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#include "vm-state-inl.h"
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// Case-insensitive bounded string comparisons. Use stricmp() on Win32. Usually
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// defined in strings.h.
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int strncasecmp(const char* s1, const char* s2, int n) {
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return _strnicmp(s1, s2, n);
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// Extra functions for MinGW. Most of these are the _s functions which are in
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// the Microsoft Visual Studio C++ CRT.
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#ifndef __MINGW64_VERSION_MAJOR
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inline void MemoryBarrier() {
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__asm__ __volatile__("xchgl %%eax,%0 ":"=r" (barrier));
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#endif // __MINGW64_VERSION_MAJOR
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#ifndef MINGW_HAS_SECURE_API
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int localtime_s(tm* out_tm, const time_t* time) {
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tm* posix_local_time_struct = localtime(time);
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if (posix_local_time_struct == NULL) return 1;
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*out_tm = *posix_local_time_struct;
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int fopen_s(FILE** pFile, const char* filename, const char* mode) {
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*pFile = fopen(filename, mode);
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return *pFile != NULL ? 0 : 1;
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int _vsnprintf_s(char* buffer, size_t sizeOfBuffer, size_t count,
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const char* format, va_list argptr) {
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ASSERT(count == _TRUNCATE);
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return _vsnprintf(buffer, sizeOfBuffer, format, argptr);
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int strncpy_s(char* dest, size_t dest_size, const char* source, size_t count) {
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CHECK(source != NULL);
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CHECK_GT(dest_size, 0);
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if (count == _TRUNCATE) {
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while (dest_size > 0 && *source != 0) {
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*(dest++) = *(source++);
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if (dest_size == 0) {
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while (dest_size > 0 && count > 0 && *source != 0) {
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*(dest++) = *(source++);
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CHECK_GT(dest_size, 0);
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#endif // MINGW_HAS_SECURE_API
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#endif // __MINGW32__
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// Generate a pseudo-random number in the range 0-2^31-1. Usually
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// defined in stdlib.h. Missing in both Microsoft Visual Studio C++ and MinGW.
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intptr_t OS::MaxVirtualMemory() {
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double ceiling(double x) {
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static Mutex* limit_mutex = NULL;
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#if defined(V8_TARGET_ARCH_IA32)
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static OS::MemCopyFunction memcopy_function = NULL;
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// Defined in codegen-ia32.cc.
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OS::MemCopyFunction CreateMemCopyFunction();
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// Copy memory area to disjoint memory area.
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void OS::MemCopy(void* dest, const void* src, size_t size) {
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// Note: here we rely on dependent reads being ordered. This is true
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// on all architectures we currently support.
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(*memcopy_function)(dest, src, size);
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CHECK_EQ(0, memcmp(dest, src, size));
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#endif // V8_TARGET_ARCH_IA32
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typedef double (*ModuloFunction)(double, double);
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static ModuloFunction modulo_function = NULL;
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// Defined in codegen-x64.cc.
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ModuloFunction CreateModuloFunction();
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void init_modulo_function() {
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modulo_function = CreateModuloFunction();
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double modulo(double x, double y) {
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// Note: here we rely on dependent reads being ordered. This is true
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// on all architectures we currently support.
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return (*modulo_function)(x, y);
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double modulo(double x, double y) {
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// Workaround MS fmod bugs. ECMA-262 says:
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// dividend is finite and divisor is an infinity => result equals dividend
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// dividend is a zero and divisor is nonzero finite => result equals dividend
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if (!(isfinite(x) && (!isfinite(y) && !isnan(y))) &&
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!(x == 0 && (y != 0 && isfinite(y)))) {
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#define UNARY_MATH_FUNCTION(name, generator) \
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static UnaryMathFunction fast_##name##_function = NULL; \
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void init_fast_##name##_function() { \
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fast_##name##_function = generator; \
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double fast_##name(double x) { \
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return (*fast_##name##_function)(x); \
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UNARY_MATH_FUNCTION(sin, CreateTranscendentalFunction(TranscendentalCache::SIN))
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UNARY_MATH_FUNCTION(cos, CreateTranscendentalFunction(TranscendentalCache::COS))
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UNARY_MATH_FUNCTION(tan, CreateTranscendentalFunction(TranscendentalCache::TAN))
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UNARY_MATH_FUNCTION(log, CreateTranscendentalFunction(TranscendentalCache::LOG))
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UNARY_MATH_FUNCTION(sqrt, CreateSqrtFunction())
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init_modulo_function();
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init_fast_sin_function();
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init_fast_cos_function();
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init_fast_tan_function();
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init_fast_log_function();
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init_fast_sqrt_function();
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// ----------------------------------------------------------------------------
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// The Time class represents time on win32. A timestamp is represented as
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// a 64-bit integer in 100 nanoseconds since January 1, 1601 (UTC). JavaScript
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// timestamps are represented as a doubles in milliseconds since 00:00:00 UTC,
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explicit Time(double jstime);
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Time(int year, int mon, int day, int hour, int min, int sec);
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// Convert timestamp to JavaScript representation.
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// Set timestamp to current time.
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void SetToCurrentTime();
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// Returns the local timezone offset in milliseconds east of UTC. This is
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// the number of milliseconds you must add to UTC to get local time, i.e.
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// LocalOffset(CET) = 3600000 and LocalOffset(PST) = -28800000. This
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// routine also takes into account whether daylight saving is effect
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int64_t LocalOffset();
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// Returns the daylight savings time offset for the time in milliseconds.
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int64_t DaylightSavingsOffset();
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// Returns a string identifying the current timezone for the
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// timestamp taking into account daylight saving.
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char* LocalTimezone();
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// Constants for time conversion.
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static const int64_t kTimeEpoc = 116444736000000000LL;
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static const int64_t kTimeScaler = 10000;
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static const int64_t kMsPerMinute = 60000;
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// Constants for timezone information.
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static const int kTzNameSize = 128;
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static const bool kShortTzNames = false;
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// Timezone information. We need to have static buffers for the
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// timezone names because we return pointers to these in
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static bool tz_initialized_;
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static TIME_ZONE_INFORMATION tzinfo_;
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static char std_tz_name_[kTzNameSize];
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static char dst_tz_name_[kTzNameSize];
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// Initialize the timezone information (if not already done).
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// Guess the name of the timezone from the bias.
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static const char* GuessTimezoneNameFromBias(int bias);
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// Return whether or not daylight savings time is in effect at this time.
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// Return the difference (in milliseconds) between this timestamp and
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// another timestamp.
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int64_t Diff(Time* other);
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// Accessor for FILETIME representation.
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FILETIME& ft() { return time_.ft_; }
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// Accessor for integer representation.
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int64_t& t() { return time_.t_; }
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// Although win32 uses 64-bit integers for representing timestamps,
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// these are packed into a FILETIME structure. The FILETIME structure
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// is just a struct representing a 64-bit integer. The TimeStamp union
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// allows access to both a FILETIME and an integer representation of
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bool Time::tz_initialized_ = false;
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TIME_ZONE_INFORMATION Time::tzinfo_;
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char Time::std_tz_name_[kTzNameSize];
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char Time::dst_tz_name_[kTzNameSize];
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// Initialize timestamp to start of epoc.
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// Initialize timestamp from a JavaScript timestamp.
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Time::Time(double jstime) {
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t() = static_cast<int64_t>(jstime) * kTimeScaler + kTimeEpoc;
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// Initialize timestamp from date/time components.
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Time::Time(int year, int mon, int day, int hour, int min, int sec) {
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st.wMilliseconds = 0;
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SystemTimeToFileTime(&st, &ft());
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// Convert timestamp to JavaScript timestamp.
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double Time::ToJSTime() {
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return static_cast<double>((t() - kTimeEpoc) / kTimeScaler);
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// Guess the name of the timezone from the bias.
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// The guess is very biased towards the northern hemisphere.
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const char* Time::GuessTimezoneNameFromBias(int bias) {
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static const int kHour = 60;
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case -9*kHour: return "Alaska";
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case -8*kHour: return "Pacific";
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case -7*kHour: return "Mountain";
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case -6*kHour: return "Central";
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case -5*kHour: return "Eastern";
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case -4*kHour: return "Atlantic";
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case 0*kHour: return "GMT";
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case +1*kHour: return "Central Europe";
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case +2*kHour: return "Eastern Europe";
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case +3*kHour: return "Russia";
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case +5*kHour + 30: return "India";
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case +8*kHour: return "China";
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case +9*kHour: return "Japan";
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case +12*kHour: return "New Zealand";
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default: return "Local";
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// Initialize timezone information. The timezone information is obtained from
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// windows. If we cannot get the timezone information we fall back to CET.
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// Please notice that this code is not thread-safe.
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// Just return if timezone information has already been initialized.
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if (tz_initialized_) return;
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// Initialize POSIX time zone data.
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// Obtain timezone information from operating system.
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memset(&tzinfo_, 0, sizeof(tzinfo_));
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if (GetTimeZoneInformation(&tzinfo_) == TIME_ZONE_ID_INVALID) {
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// If we cannot get timezone information we fall back to CET.
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tzinfo_.StandardDate.wMonth = 10;
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tzinfo_.StandardDate.wDay = 5;
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tzinfo_.StandardDate.wHour = 3;
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tzinfo_.StandardBias = 0;
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tzinfo_.DaylightDate.wMonth = 3;
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tzinfo_.DaylightDate.wDay = 5;
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tzinfo_.DaylightDate.wHour = 2;
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tzinfo_.DaylightBias = -60;
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// Make standard and DST timezone names.
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WideCharToMultiByte(CP_UTF8, 0, tzinfo_.StandardName, -1,
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std_tz_name_, kTzNameSize, NULL, NULL);
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std_tz_name_[kTzNameSize - 1] = '\0';
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WideCharToMultiByte(CP_UTF8, 0, tzinfo_.DaylightName, -1,
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dst_tz_name_, kTzNameSize, NULL, NULL);
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dst_tz_name_[kTzNameSize - 1] = '\0';
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// If OS returned empty string or resource id (like "@tzres.dll,-211")
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// simply guess the name from the UTC bias of the timezone.
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// To properly resolve the resource identifier requires a library load,
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// which is not possible in a sandbox.
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if (std_tz_name_[0] == '\0' || std_tz_name_[0] == '@') {
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OS::SNPrintF(Vector<char>(std_tz_name_, kTzNameSize - 1),
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GuessTimezoneNameFromBias(tzinfo_.Bias));
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if (dst_tz_name_[0] == '\0' || dst_tz_name_[0] == '@') {
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OS::SNPrintF(Vector<char>(dst_tz_name_, kTzNameSize - 1),
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GuessTimezoneNameFromBias(tzinfo_.Bias));
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// Timezone information initialized.
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tz_initialized_ = true;
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// Return the difference in milliseconds between this and another timestamp.
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int64_t Time::Diff(Time* other) {
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return (t() - other->t()) / kTimeScaler;
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// Set timestamp to current time.
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void Time::SetToCurrentTime() {
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// The default GetSystemTimeAsFileTime has a ~15.5ms resolution.
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// Because we're fast, we like fast timers which have at least a
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// timeGetTime() provides 1ms granularity when combined with
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// timeBeginPeriod(). If the host application for v8 wants fast
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// timers, it can use timeBeginPeriod to increase the resolution.
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// Using timeGetTime() has a drawback because it is a 32bit value
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// and hence rolls-over every ~49days.
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// To use the clock, we use GetSystemTimeAsFileTime as our base;
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// and then use timeGetTime to extrapolate current time from the
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// start time. To deal with rollovers, we resync the clock
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// any time when more than kMaxClockElapsedTime has passed or
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// whenever timeGetTime creates a rollover.
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static bool initialized = false;
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static TimeStamp init_time;
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static DWORD init_ticks;
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static const int64_t kHundredNanosecondsPerSecond = 10000000;
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static const int64_t kMaxClockElapsedTime =
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60*kHundredNanosecondsPerSecond; // 1 minute
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// If we are uninitialized, we need to resync the clock.
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bool needs_resync = !initialized;
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// Get the current time.
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GetSystemTimeAsFileTime(&time_now.ft_);
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DWORD ticks_now = timeGetTime();
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// Check if we need to resync due to clock rollover.
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needs_resync |= ticks_now < init_ticks;
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// Check if we need to resync due to elapsed time.
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needs_resync |= (time_now.t_ - init_time.t_) > kMaxClockElapsedTime;
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// Check if we need to resync due to backwards time change.
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needs_resync |= time_now.t_ < init_time.t_;
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// Resync the clock if necessary.
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GetSystemTimeAsFileTime(&init_time.ft_);
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init_ticks = ticks_now = timeGetTime();
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// Finally, compute the actual time. Why is this so hard.
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DWORD elapsed = ticks_now - init_ticks;
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this->time_.t_ = init_time.t_ + (static_cast<int64_t>(elapsed) * 10000);
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// Return the local timezone offset in milliseconds east of UTC. This
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// takes into account whether daylight saving is in effect at the time.
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// Only times in the 32-bit Unix range may be passed to this function.
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// Also, adding the time-zone offset to the input must not overflow.
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// The function EquivalentTime() in date.js guarantees this.
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int64_t Time::LocalOffset() {
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// Initialize timezone information, if needed.
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Time rounded_to_second(*this);
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rounded_to_second.t() = rounded_to_second.t() / 1000 / kTimeScaler *
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// Convert to local time using POSIX localtime function.
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// Windows XP Service Pack 3 made SystemTimeToTzSpecificLocalTime()
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// very slow. Other browsers use localtime().
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// Convert from JavaScript milliseconds past 1/1/1970 0:00:00 to
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// POSIX seconds past 1/1/1970 0:00:00.
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double unchecked_posix_time = rounded_to_second.ToJSTime() / 1000;
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if (unchecked_posix_time > INT_MAX || unchecked_posix_time < 0) {
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// Because _USE_32BIT_TIME_T is defined, time_t is a 32-bit int.
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time_t posix_time = static_cast<time_t>(unchecked_posix_time);
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// Convert to local time, as struct with fields for day, hour, year, etc.
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tm posix_local_time_struct;
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if (localtime_s(&posix_local_time_struct, &posix_time)) return 0;
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if (posix_local_time_struct.tm_isdst > 0) {
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return (tzinfo_.Bias + tzinfo_.DaylightBias) * -kMsPerMinute;
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} else if (posix_local_time_struct.tm_isdst == 0) {
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return (tzinfo_.Bias + tzinfo_.StandardBias) * -kMsPerMinute;
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return tzinfo_.Bias * -kMsPerMinute;
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// Return whether or not daylight savings time is in effect at this time.
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// Initialize timezone information, if needed.
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// Determine if DST is in effect at the specified time.
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if (tzinfo_.StandardDate.wMonth != 0 || tzinfo_.DaylightDate.wMonth != 0) {
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// Get the local timezone offset for the timestamp in milliseconds.
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int64_t offset = LocalOffset();
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// Compute the offset for DST. The bias parameters in the timezone info
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// are specified in minutes. These must be converted to milliseconds.
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int64_t dstofs = -(tzinfo_.Bias + tzinfo_.DaylightBias) * kMsPerMinute;
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// If the local time offset equals the timezone bias plus the daylight
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// bias then DST is in effect.
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in_dst = offset == dstofs;
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// Return the daylight savings time offset for this time.
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int64_t Time::DaylightSavingsOffset() {
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return InDST() ? 60 * kMsPerMinute : 0;
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// Returns a string identifying the current timezone for the
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// timestamp taking into account daylight saving.
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char* Time::LocalTimezone() {
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// Return the standard or DST time zone name based on whether daylight
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// saving is in effect at the given time.
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return InDST() ? dst_tz_name_ : std_tz_name_;
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void OS::PostSetUp() {
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// Math functions depend on CPU features therefore they are initialized after
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#if defined(V8_TARGET_ARCH_IA32)
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memcopy_function = CreateMemCopyFunction();
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// Returns the accumulated user time for thread.
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int OS::GetUserTime(uint32_t* secs, uint32_t* usecs) {
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// Get the amount of time that the thread has executed in user mode.
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if (!GetThreadTimes(GetCurrentThread(), &dummy, &dummy, &dummy,
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reinterpret_cast<FILETIME*>(&usertime))) return -1;
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// Adjust the resolution to micro-seconds.
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// Convert to seconds and microseconds
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*secs = static_cast<uint32_t>(usertime / 1000000);
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*usecs = static_cast<uint32_t>(usertime % 1000000);
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// Returns current time as the number of milliseconds since
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// 00:00:00 UTC, January 1, 1970.
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double OS::TimeCurrentMillis() {
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t.SetToCurrentTime();
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// Returns the tickcounter based on timeGetTime.
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int64_t OS::Ticks() {
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return timeGetTime() * 1000; // Convert to microseconds.
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// Returns a string identifying the current timezone taking into
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// account daylight saving.
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const char* OS::LocalTimezone(double time) {
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return Time(time).LocalTimezone();
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// Returns the local time offset in milliseconds east of UTC without
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// taking daylight savings time into account.
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double OS::LocalTimeOffset() {
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// Use current time, rounded to the millisecond.
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Time t(TimeCurrentMillis());
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// Time::LocalOffset inlcudes any daylight savings offset, so subtract it.
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return static_cast<double>(t.LocalOffset() - t.DaylightSavingsOffset());
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// Returns the daylight savings offset in milliseconds for the given
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double OS::DaylightSavingsOffset(double time) {
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int64_t offset = Time(time).DaylightSavingsOffset();
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return static_cast<double>(offset);
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int OS::GetLastError() {
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return ::GetLastError();
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int OS::GetCurrentProcessId() {
631
return static_cast<int>(::GetCurrentProcessId());
635
// ----------------------------------------------------------------------------
636
// Win32 console output.
638
// If a Win32 application is linked as a console application it has a normal
639
// standard output and standard error. In this case normal printf works fine
640
// for output. However, if the application is linked as a GUI application,
641
// the process doesn't have a console, and therefore (debugging) output is lost.
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// This is the case if we are embedded in a windows program (like a browser).
643
// In order to be able to get debug output in this case the the debugging
644
// facility using OutputDebugString. This output goes to the active debugger
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// for the process (if any). Else the output can be monitored using DBMON.EXE.
648
UNKNOWN, // Output method has not yet been determined.
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CONSOLE, // Output is written to stdout.
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ODS // Output is written to debug facility.
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static OutputMode output_mode = UNKNOWN; // Current output mode.
656
// Determine if the process has a console for output.
657
static bool HasConsole() {
658
// Only check the first time. Eventual race conditions are not a problem,
659
// because all threads will eventually determine the same mode.
660
if (output_mode == UNKNOWN) {
661
// We cannot just check that the standard output is attached to a console
662
// because this would fail if output is redirected to a file. Therefore we
663
// say that a process does not have an output console if either the
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// standard output handle is invalid or its file type is unknown.
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if (GetStdHandle(STD_OUTPUT_HANDLE) != INVALID_HANDLE_VALUE &&
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GetFileType(GetStdHandle(STD_OUTPUT_HANDLE)) != FILE_TYPE_UNKNOWN)
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output_mode = CONSOLE;
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return output_mode == CONSOLE;
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static void VPrintHelper(FILE* stream, const char* format, va_list args) {
677
vfprintf(stream, format, args);
679
// It is important to use safe print here in order to avoid
680
// overflowing the buffer. We might truncate the output, but this
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EmbeddedVector<char, 4096> buffer;
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OS::VSNPrintF(buffer, format, args);
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OutputDebugStringA(buffer.start());
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FILE* OS::FOpen(const char* path, const char* mode) {
691
if (fopen_s(&result, path, mode) == 0) {
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bool OS::Remove(const char* path) {
700
return (DeleteFileA(path) != 0);
704
FILE* OS::OpenTemporaryFile() {
705
// tmpfile_s tries to use the root dir, don't use it.
706
char tempPathBuffer[MAX_PATH];
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DWORD path_result = 0;
708
path_result = GetTempPathA(MAX_PATH, tempPathBuffer);
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if (path_result > MAX_PATH || path_result == 0) return NULL;
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UINT name_result = 0;
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char tempNameBuffer[MAX_PATH];
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name_result = GetTempFileNameA(tempPathBuffer, "", 0, tempNameBuffer);
713
if (name_result == 0) return NULL;
714
FILE* result = FOpen(tempNameBuffer, "w+"); // Same mode as tmpfile uses.
715
if (result != NULL) {
716
Remove(tempNameBuffer); // Delete on close.
722
// Open log file in binary mode to avoid /n -> /r/n conversion.
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const char* const OS::LogFileOpenMode = "wb";
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// Print (debug) message to console.
727
void OS::Print(const char* format, ...) {
729
va_start(args, format);
730
VPrint(format, args);
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void OS::VPrint(const char* format, va_list args) {
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VPrintHelper(stdout, format, args);
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void OS::FPrint(FILE* out, const char* format, ...) {
742
va_start(args, format);
743
VFPrint(out, format, args);
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void OS::VFPrint(FILE* out, const char* format, va_list args) {
749
VPrintHelper(out, format, args);
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// Print error message to console.
754
void OS::PrintError(const char* format, ...) {
756
va_start(args, format);
757
VPrintError(format, args);
762
void OS::VPrintError(const char* format, va_list args) {
763
VPrintHelper(stderr, format, args);
767
int OS::SNPrintF(Vector<char> str, const char* format, ...) {
769
va_start(args, format);
770
int result = VSNPrintF(str, format, args);
776
int OS::VSNPrintF(Vector<char> str, const char* format, va_list args) {
777
int n = _vsnprintf_s(str.start(), str.length(), _TRUNCATE, format, args);
778
// Make sure to zero-terminate the string if the output was
779
// truncated or if there was an error.
780
if (n < 0 || n >= str.length()) {
781
if (str.length() > 0)
782
str[str.length() - 1] = '\0';
790
char* OS::StrChr(char* str, int c) {
791
return const_cast<char*>(strchr(str, c));
795
void OS::StrNCpy(Vector<char> dest, const char* src, size_t n) {
796
// Use _TRUNCATE or strncpy_s crashes (by design) if buffer is too small.
797
size_t buffer_size = static_cast<size_t>(dest.length());
798
if (n + 1 > buffer_size) // count for trailing '\0'
800
int result = strncpy_s(dest.start(), dest.length(), src, n);
802
ASSERT(result == 0 || (n == _TRUNCATE && result == STRUNCATE));
806
// We keep the lowest and highest addresses mapped as a quick way of
807
// determining that pointers are outside the heap (used mostly in assertions
808
// and verification). The estimate is conservative, i.e., not all addresses in
809
// 'allocated' space are actually allocated to our heap. The range is
810
// [lowest, highest), inclusive on the low and and exclusive on the high end.
811
static void* lowest_ever_allocated = reinterpret_cast<void*>(-1);
812
static void* highest_ever_allocated = reinterpret_cast<void*>(0);
815
static void UpdateAllocatedSpaceLimits(void* address, int size) {
816
ASSERT(limit_mutex != NULL);
817
ScopedLock lock(limit_mutex);
819
lowest_ever_allocated = Min(lowest_ever_allocated, address);
820
highest_ever_allocated =
821
Max(highest_ever_allocated,
822
reinterpret_cast<void*>(reinterpret_cast<char*>(address) + size));
826
bool OS::IsOutsideAllocatedSpace(void* pointer) {
827
if (pointer < lowest_ever_allocated || pointer >= highest_ever_allocated)
829
// Ask the Windows API
830
if (IsBadWritePtr(pointer, 1))
836
// Get the system's page size used by VirtualAlloc() or the next power
837
// of two. The reason for always returning a power of two is that the
838
// rounding up in OS::Allocate expects that.
839
static size_t GetPageSize() {
840
static size_t page_size = 0;
841
if (page_size == 0) {
843
GetSystemInfo(&info);
844
page_size = RoundUpToPowerOf2(info.dwPageSize);
850
// The allocation alignment is the guaranteed alignment for
851
// VirtualAlloc'ed blocks of memory.
852
size_t OS::AllocateAlignment() {
853
static size_t allocate_alignment = 0;
854
if (allocate_alignment == 0) {
856
GetSystemInfo(&info);
857
allocate_alignment = info.dwAllocationGranularity;
859
return allocate_alignment;
863
static void* GetRandomAddr() {
864
Isolate* isolate = Isolate::UncheckedCurrent();
865
// Note that the current isolate isn't set up in a call path via
866
// CpuFeatures::Probe. We don't care about randomization in this case because
867
// the code page is immediately freed.
868
if (isolate != NULL) {
869
// The address range used to randomize RWX allocations in OS::Allocate
870
// Try not to map pages into the default range that windows loads DLLs
871
// Use a multiple of 64k to prevent committing unused memory.
872
// Note: This does not guarantee RWX regions will be within the
873
// range kAllocationRandomAddressMin to kAllocationRandomAddressMax
874
#ifdef V8_HOST_ARCH_64_BIT
875
static const intptr_t kAllocationRandomAddressMin = 0x0000000080000000;
876
static const intptr_t kAllocationRandomAddressMax = 0x000003FFFFFF0000;
878
static const intptr_t kAllocationRandomAddressMin = 0x04000000;
879
static const intptr_t kAllocationRandomAddressMax = 0x3FFF0000;
881
uintptr_t address = (V8::RandomPrivate(isolate) << kPageSizeBits)
882
| kAllocationRandomAddressMin;
883
address &= kAllocationRandomAddressMax;
884
return reinterpret_cast<void *>(address);
890
static void* RandomizedVirtualAlloc(size_t size, int action, int protection) {
893
if (protection == PAGE_EXECUTE_READWRITE || protection == PAGE_NOACCESS) {
894
// For exectutable pages try and randomize the allocation address
895
for (size_t attempts = 0; base == NULL && attempts < 3; ++attempts) {
896
base = VirtualAlloc(GetRandomAddr(), size, action, protection);
900
// After three attempts give up and let the OS find an address to use.
901
if (base == NULL) base = VirtualAlloc(NULL, size, action, protection);
907
void* OS::Allocate(const size_t requested,
909
bool is_executable) {
910
// VirtualAlloc rounds allocated size to page size automatically.
911
size_t msize = RoundUp(requested, static_cast<int>(GetPageSize()));
913
// Windows XP SP2 allows Data Excution Prevention (DEP).
914
int prot = is_executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
916
LPVOID mbase = RandomizedVirtualAlloc(msize,
917
MEM_COMMIT | MEM_RESERVE,
921
LOG(ISOLATE, StringEvent("OS::Allocate", "VirtualAlloc failed"));
925
ASSERT(IsAligned(reinterpret_cast<size_t>(mbase), OS::AllocateAlignment()));
928
UpdateAllocatedSpaceLimits(mbase, static_cast<int>(msize));
933
void OS::Free(void* address, const size_t size) {
934
// TODO(1240712): VirtualFree has a return value which is ignored here.
935
VirtualFree(address, 0, MEM_RELEASE);
940
intptr_t OS::CommitPageSize() {
945
void OS::ProtectCode(void* address, const size_t size) {
947
VirtualProtect(address, size, PAGE_EXECUTE_READ, &old_protect);
951
void OS::Guard(void* address, const size_t size) {
953
VirtualProtect(address, size, PAGE_READONLY | PAGE_GUARD, &oldprotect);
957
void OS::Sleep(int milliseconds) {
958
::Sleep(milliseconds);
963
if (IsDebuggerPresent() || FLAG_break_on_abort) {
966
// Make the MSVCRT do a silent abort.
972
void OS::DebugBreak() {
981
class Win32MemoryMappedFile : public OS::MemoryMappedFile {
983
Win32MemoryMappedFile(HANDLE file,
988
file_mapping_(file_mapping),
991
virtual ~Win32MemoryMappedFile();
992
virtual void* memory() { return memory_; }
993
virtual int size() { return size_; }
996
HANDLE file_mapping_;
1002
OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) {
1003
// Open a physical file
1004
HANDLE file = CreateFileA(name, GENERIC_READ | GENERIC_WRITE,
1005
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
1006
if (file == INVALID_HANDLE_VALUE) return NULL;
1008
int size = static_cast<int>(GetFileSize(file, NULL));
1010
// Create a file mapping for the physical file
1011
HANDLE file_mapping = CreateFileMapping(file, NULL,
1012
PAGE_READWRITE, 0, static_cast<DWORD>(size), NULL);
1013
if (file_mapping == NULL) return NULL;
1015
// Map a view of the file into memory
1016
void* memory = MapViewOfFile(file_mapping, FILE_MAP_ALL_ACCESS, 0, 0, size);
1017
return new Win32MemoryMappedFile(file, file_mapping, memory, size);
1021
OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size,
1023
// Open a physical file
1024
HANDLE file = CreateFileA(name, GENERIC_READ | GENERIC_WRITE,
1025
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_ALWAYS, 0, NULL);
1026
if (file == NULL) return NULL;
1027
// Create a file mapping for the physical file
1028
HANDLE file_mapping = CreateFileMapping(file, NULL,
1029
PAGE_READWRITE, 0, static_cast<DWORD>(size), NULL);
1030
if (file_mapping == NULL) return NULL;
1031
// Map a view of the file into memory
1032
void* memory = MapViewOfFile(file_mapping, FILE_MAP_ALL_ACCESS, 0, 0, size);
1033
if (memory) memmove(memory, initial, size);
1034
return new Win32MemoryMappedFile(file, file_mapping, memory, size);
1038
Win32MemoryMappedFile::~Win32MemoryMappedFile() {
1039
if (memory_ != NULL)
1040
UnmapViewOfFile(memory_);
1041
CloseHandle(file_mapping_);
1046
// The following code loads functions defined in DbhHelp.h and TlHelp32.h
1047
// dynamically. This is to avoid being depending on dbghelp.dll and
1048
// tlhelp32.dll when running (the functions in tlhelp32.dll have been moved to
1049
// kernel32.dll at some point so loading functions defines in TlHelp32.h
1050
// dynamically might not be necessary any more - for some versions of Windows?).
1052
// Function pointers to functions dynamically loaded from dbghelp.dll.
1053
#define DBGHELP_FUNCTION_LIST(V) \
1057
V(SymGetSearchPath) \
1058
V(SymLoadModule64) \
1060
V(SymGetSymFromAddr64) \
1061
V(SymGetLineFromAddr64) \
1062
V(SymFunctionTableAccess64) \
1063
V(SymGetModuleBase64)
1065
// Function pointers to functions dynamically loaded from dbghelp.dll.
1066
#define TLHELP32_FUNCTION_LIST(V) \
1067
V(CreateToolhelp32Snapshot) \
1071
// Define the decoration to use for the type and variable name used for
1072
// dynamically loaded DLL function..
1073
#define DLL_FUNC_TYPE(name) _##name##_
1074
#define DLL_FUNC_VAR(name) _##name
1076
// Define the type for each dynamically loaded DLL function. The function
1077
// definitions are copied from DbgHelp.h and TlHelp32.h. The IN and VOID macros
1078
// from the Windows include files are redefined here to have the function
1079
// definitions to be as close to the ones in the original .h files as possible.
1087
// DbgHelp isn't supported on MinGW yet
1089
// DbgHelp.h functions.
1090
typedef BOOL (__stdcall *DLL_FUNC_TYPE(SymInitialize))(IN HANDLE hProcess,
1091
IN PSTR UserSearchPath,
1092
IN BOOL fInvadeProcess);
1093
typedef DWORD (__stdcall *DLL_FUNC_TYPE(SymGetOptions))(VOID);
1094
typedef DWORD (__stdcall *DLL_FUNC_TYPE(SymSetOptions))(IN DWORD SymOptions);
1095
typedef BOOL (__stdcall *DLL_FUNC_TYPE(SymGetSearchPath))(
1097
OUT PSTR SearchPath,
1098
IN DWORD SearchPathLength);
1099
typedef DWORD64 (__stdcall *DLL_FUNC_TYPE(SymLoadModule64))(
1104
IN DWORD64 BaseOfDll,
1105
IN DWORD SizeOfDll);
1106
typedef BOOL (__stdcall *DLL_FUNC_TYPE(StackWalk64))(
1110
LPSTACKFRAME64 StackFrame,
1111
PVOID ContextRecord,
1112
PREAD_PROCESS_MEMORY_ROUTINE64 ReadMemoryRoutine,
1113
PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
1114
PGET_MODULE_BASE_ROUTINE64 GetModuleBaseRoutine,
1115
PTRANSLATE_ADDRESS_ROUTINE64 TranslateAddress);
1116
typedef BOOL (__stdcall *DLL_FUNC_TYPE(SymGetSymFromAddr64))(
1119
OUT PDWORD64 pdwDisplacement,
1120
OUT PIMAGEHLP_SYMBOL64 Symbol);
1121
typedef BOOL (__stdcall *DLL_FUNC_TYPE(SymGetLineFromAddr64))(
1124
OUT PDWORD pdwDisplacement,
1125
OUT PIMAGEHLP_LINE64 Line64);
1126
// DbgHelp.h typedefs. Implementation found in dbghelp.dll.
1127
typedef PVOID (__stdcall *DLL_FUNC_TYPE(SymFunctionTableAccess64))(
1129
DWORD64 AddrBase); // DbgHelp.h typedef PFUNCTION_TABLE_ACCESS_ROUTINE64
1130
typedef DWORD64 (__stdcall *DLL_FUNC_TYPE(SymGetModuleBase64))(
1132
DWORD64 AddrBase); // DbgHelp.h typedef PGET_MODULE_BASE_ROUTINE64
1134
// TlHelp32.h functions.
1135
typedef HANDLE (__stdcall *DLL_FUNC_TYPE(CreateToolhelp32Snapshot))(
1137
DWORD th32ProcessID);
1138
typedef BOOL (__stdcall *DLL_FUNC_TYPE(Module32FirstW))(HANDLE hSnapshot,
1139
LPMODULEENTRY32W lpme);
1140
typedef BOOL (__stdcall *DLL_FUNC_TYPE(Module32NextW))(HANDLE hSnapshot,
1141
LPMODULEENTRY32W lpme);
1146
// Declare a variable for each dynamically loaded DLL function.
1147
#define DEF_DLL_FUNCTION(name) DLL_FUNC_TYPE(name) DLL_FUNC_VAR(name) = NULL;
1148
DBGHELP_FUNCTION_LIST(DEF_DLL_FUNCTION)
1149
TLHELP32_FUNCTION_LIST(DEF_DLL_FUNCTION)
1150
#undef DEF_DLL_FUNCTION
1152
// Load the functions. This function has a lot of "ugly" macros in order to
1153
// keep down code duplication.
1155
static bool LoadDbgHelpAndTlHelp32() {
1156
static bool dbghelp_loaded = false;
1158
if (dbghelp_loaded) return true;
1162
// Load functions from the dbghelp.dll module.
1163
module = LoadLibrary(TEXT("dbghelp.dll"));
1164
if (module == NULL) {
1168
#define LOAD_DLL_FUNC(name) \
1169
DLL_FUNC_VAR(name) = \
1170
reinterpret_cast<DLL_FUNC_TYPE(name)>(GetProcAddress(module, #name));
1172
DBGHELP_FUNCTION_LIST(LOAD_DLL_FUNC)
1174
#undef LOAD_DLL_FUNC
1176
// Load functions from the kernel32.dll module (the TlHelp32.h function used
1177
// to be in tlhelp32.dll but are now moved to kernel32.dll).
1178
module = LoadLibrary(TEXT("kernel32.dll"));
1179
if (module == NULL) {
1183
#define LOAD_DLL_FUNC(name) \
1184
DLL_FUNC_VAR(name) = \
1185
reinterpret_cast<DLL_FUNC_TYPE(name)>(GetProcAddress(module, #name));
1187
TLHELP32_FUNCTION_LIST(LOAD_DLL_FUNC)
1189
#undef LOAD_DLL_FUNC
1191
// Check that all functions where loaded.
1193
#define DLL_FUNC_LOADED(name) (DLL_FUNC_VAR(name) != NULL) &&
1195
DBGHELP_FUNCTION_LIST(DLL_FUNC_LOADED)
1196
TLHELP32_FUNCTION_LIST(DLL_FUNC_LOADED)
1198
#undef DLL_FUNC_LOADED
1201
dbghelp_loaded = result;
1203
// NOTE: The modules are never unloaded and will stay around until the
1204
// application is closed.
1208
// Load the symbols for generating stack traces.
1209
static bool LoadSymbols(HANDLE process_handle) {
1210
static bool symbols_loaded = false;
1212
if (symbols_loaded) return true;
1216
// Initialize the symbol engine.
1217
ok = _SymInitialize(process_handle, // hProcess
1218
NULL, // UserSearchPath
1219
false); // fInvadeProcess
1220
if (!ok) return false;
1222
DWORD options = _SymGetOptions();
1223
options |= SYMOPT_LOAD_LINES;
1224
options |= SYMOPT_FAIL_CRITICAL_ERRORS;
1225
options = _SymSetOptions(options);
1227
char buf[OS::kStackWalkMaxNameLen] = {0};
1228
ok = _SymGetSearchPath(process_handle, buf, OS::kStackWalkMaxNameLen);
1230
int err = GetLastError();
1231
PrintF("%d\n", err);
1235
HANDLE snapshot = _CreateToolhelp32Snapshot(
1236
TH32CS_SNAPMODULE, // dwFlags
1237
GetCurrentProcessId()); // th32ProcessId
1238
if (snapshot == INVALID_HANDLE_VALUE) return false;
1239
MODULEENTRY32W module_entry;
1240
module_entry.dwSize = sizeof(module_entry); // Set the size of the structure.
1241
BOOL cont = _Module32FirstW(snapshot, &module_entry);
1244
// NOTE the SymLoadModule64 function has the peculiarity of accepting a
1245
// both unicode and ASCII strings even though the parameter is PSTR.
1246
base = _SymLoadModule64(
1247
process_handle, // hProcess
1249
reinterpret_cast<PSTR>(module_entry.szExePath), // ImageName
1250
reinterpret_cast<PSTR>(module_entry.szModule), // ModuleName
1251
reinterpret_cast<DWORD64>(module_entry.modBaseAddr), // BaseOfDll
1252
module_entry.modBaseSize); // SizeOfDll
1254
int err = GetLastError();
1255
if (err != ERROR_MOD_NOT_FOUND &&
1256
err != ERROR_INVALID_HANDLE) return false;
1258
LOG(i::Isolate::Current(),
1260
module_entry.szExePath,
1261
reinterpret_cast<unsigned int>(module_entry.modBaseAddr),
1262
reinterpret_cast<unsigned int>(module_entry.modBaseAddr +
1263
module_entry.modBaseSize)));
1264
cont = _Module32NextW(snapshot, &module_entry);
1266
CloseHandle(snapshot);
1268
symbols_loaded = true;
1273
void OS::LogSharedLibraryAddresses() {
1274
// SharedLibraryEvents are logged when loading symbol information.
1275
// Only the shared libraries loaded at the time of the call to
1276
// LogSharedLibraryAddresses are logged. DLLs loaded after
1277
// initialization are not accounted for.
1278
if (!LoadDbgHelpAndTlHelp32()) return;
1279
HANDLE process_handle = GetCurrentProcess();
1280
LoadSymbols(process_handle);
1284
void OS::SignalCodeMovingGC() {
1288
// Walk the stack using the facilities in dbghelp.dll and tlhelp32.dll
1290
// Switch off warning 4748 (/GS can not protect parameters and local variables
1291
// from local buffer overrun because optimizations are disabled in function) as
1292
// it is triggered by the use of inline assembler.
1293
#pragma warning(push)
1294
#pragma warning(disable : 4748)
1295
int OS::StackWalk(Vector<OS::StackFrame> frames) {
1298
// Load the required functions from DLL's.
1299
if (!LoadDbgHelpAndTlHelp32()) return kStackWalkError;
1301
// Get the process and thread handles.
1302
HANDLE process_handle = GetCurrentProcess();
1303
HANDLE thread_handle = GetCurrentThread();
1305
// Read the symbols.
1306
if (!LoadSymbols(process_handle)) return kStackWalkError;
1308
// Capture current context.
1310
RtlCaptureContext(&context);
1312
// Initialize the stack walking
1313
STACKFRAME64 stack_frame;
1314
memset(&stack_frame, 0, sizeof(stack_frame));
1316
stack_frame.AddrPC.Offset = context.Rip;
1317
stack_frame.AddrFrame.Offset = context.Rbp;
1318
stack_frame.AddrStack.Offset = context.Rsp;
1320
stack_frame.AddrPC.Offset = context.Eip;
1321
stack_frame.AddrFrame.Offset = context.Ebp;
1322
stack_frame.AddrStack.Offset = context.Esp;
1324
stack_frame.AddrPC.Mode = AddrModeFlat;
1325
stack_frame.AddrFrame.Mode = AddrModeFlat;
1326
stack_frame.AddrStack.Mode = AddrModeFlat;
1327
int frames_count = 0;
1329
// Collect stack frames.
1330
int frames_size = frames.length();
1331
while (frames_count < frames_size) {
1333
IMAGE_FILE_MACHINE_I386, // MachineType
1334
process_handle, // hProcess
1335
thread_handle, // hThread
1336
&stack_frame, // StackFrame
1337
&context, // ContextRecord
1338
NULL, // ReadMemoryRoutine
1339
_SymFunctionTableAccess64, // FunctionTableAccessRoutine
1340
_SymGetModuleBase64, // GetModuleBaseRoutine
1341
NULL); // TranslateAddress
1344
// Store the address.
1345
ASSERT((stack_frame.AddrPC.Offset >> 32) == 0); // 32-bit address.
1346
frames[frames_count].address =
1347
reinterpret_cast<void*>(stack_frame.AddrPC.Offset);
1349
// Try to locate a symbol for this frame.
1350
DWORD64 symbol_displacement;
1351
SmartArrayPointer<IMAGEHLP_SYMBOL64> symbol(
1352
NewArray<IMAGEHLP_SYMBOL64>(kStackWalkMaxNameLen));
1353
if (symbol.is_empty()) return kStackWalkError; // Out of memory.
1354
memset(*symbol, 0, sizeof(IMAGEHLP_SYMBOL64) + kStackWalkMaxNameLen);
1355
(*symbol)->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
1356
(*symbol)->MaxNameLength = kStackWalkMaxNameLen;
1357
ok = _SymGetSymFromAddr64(process_handle, // hProcess
1358
stack_frame.AddrPC.Offset, // Address
1359
&symbol_displacement, // Displacement
1362
// Try to locate more source information for the symbol.
1363
IMAGEHLP_LINE64 Line;
1364
memset(&Line, 0, sizeof(Line));
1365
Line.SizeOfStruct = sizeof(Line);
1366
DWORD line_displacement;
1367
ok = _SymGetLineFromAddr64(
1368
process_handle, // hProcess
1369
stack_frame.AddrPC.Offset, // dwAddr
1370
&line_displacement, // pdwDisplacement
1372
// Format a text representation of the frame based on the information
1375
SNPrintF(MutableCStrVector(frames[frames_count].text,
1376
kStackWalkMaxTextLen),
1378
(*symbol)->Name, Line.FileName, Line.LineNumber,
1381
SNPrintF(MutableCStrVector(frames[frames_count].text,
1382
kStackWalkMaxTextLen),
1386
// Make sure line termination is in place.
1387
frames[frames_count].text[kStackWalkMaxTextLen - 1] = '\0';
1389
// No text representation of this frame
1390
frames[frames_count].text[0] = '\0';
1392
// Continue if we are just missing a module (for non C/C++ frames a
1393
// module will never be found).
1394
int err = GetLastError();
1395
if (err != ERROR_MOD_NOT_FOUND) {
1403
// Return the number of frames filled in.
1404
return frames_count;
1407
// Restore warnings to previous settings.
1408
#pragma warning(pop)
1410
#else // __MINGW32__
1411
void OS::LogSharedLibraryAddresses() { }
1412
void OS::SignalCodeMovingGC() { }
1413
int OS::StackWalk(Vector<OS::StackFrame> frames) { return 0; }
1414
#endif // __MINGW32__
1417
uint64_t OS::CpuFeaturesImpliedByPlatform() {
1418
return 0; // Windows runs on anything.
1422
double OS::nan_value() {
1424
// Positive Quiet NaN with no payload (aka. Indeterminate) has all bits
1425
// in mask set, so value equals mask.
1426
static const __int64 nanval = kQuietNaNMask;
1427
return *reinterpret_cast<const double*>(&nanval);
1434
int OS::ActivationFrameAlignment() {
1436
return 16; // Windows 64-bit ABI requires the stack to be 16-byte aligned.
1438
return 8; // Floating-point math runs faster with 8-byte alignment.
1443
void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) {
1449
VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { }
1452
VirtualMemory::VirtualMemory(size_t size)
1453
: address_(ReserveRegion(size)), size_(size) { }
1456
VirtualMemory::VirtualMemory(size_t size, size_t alignment)
1457
: address_(NULL), size_(0) {
1458
ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment())));
1459
size_t request_size = RoundUp(size + alignment,
1460
static_cast<intptr_t>(OS::AllocateAlignment()));
1461
void* address = ReserveRegion(request_size);
1462
if (address == NULL) return;
1463
Address base = RoundUp(static_cast<Address>(address), alignment);
1464
// Try reducing the size by freeing and then reallocating a specific area.
1465
bool result = ReleaseRegion(address, request_size);
1468
address = VirtualAlloc(base, size, MEM_RESERVE, PAGE_NOACCESS);
1469
if (address != NULL) {
1470
request_size = size;
1471
ASSERT(base == static_cast<Address>(address));
1473
// Resizing failed, just go with a bigger area.
1474
address = ReserveRegion(request_size);
1475
if (address == NULL) return;
1478
size_ = request_size;
1482
VirtualMemory::~VirtualMemory() {
1484
bool result = ReleaseRegion(address_, size_);
1491
bool VirtualMemory::IsReserved() {
1492
return address_ != NULL;
1496
void VirtualMemory::Reset() {
1502
bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) {
1503
if (CommitRegion(address, size, is_executable)) {
1504
UpdateAllocatedSpaceLimits(address, static_cast<int>(size));
1511
bool VirtualMemory::Uncommit(void* address, size_t size) {
1512
ASSERT(IsReserved());
1513
return UncommitRegion(address, size);
1517
void* VirtualMemory::ReserveRegion(size_t size) {
1518
return RandomizedVirtualAlloc(size, MEM_RESERVE, PAGE_NOACCESS);
1522
bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
1523
int prot = is_executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
1524
if (NULL == VirtualAlloc(base, size, MEM_COMMIT, prot)) {
1528
UpdateAllocatedSpaceLimits(base, static_cast<int>(size));
1533
bool VirtualMemory::Guard(void* address) {
1534
if (NULL == VirtualAlloc(address,
1535
OS::CommitPageSize(),
1537
PAGE_READONLY | PAGE_GUARD)) {
1544
bool VirtualMemory::UncommitRegion(void* base, size_t size) {
1545
return VirtualFree(base, size, MEM_DECOMMIT) != 0;
1549
bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
1550
return VirtualFree(base, 0, MEM_RELEASE) != 0;
1554
// ----------------------------------------------------------------------------
1555
// Win32 thread support.
1557
// Definition of invalid thread handle and id.
1558
static const HANDLE kNoThread = INVALID_HANDLE_VALUE;
1560
// Entry point for threads. The supplied argument is a pointer to the thread
1561
// object. The entry function dispatches to the run method in the thread
1562
// object. It is important that this function has __stdcall calling
1564
static unsigned int __stdcall ThreadEntry(void* arg) {
1565
Thread* thread = reinterpret_cast<Thread*>(arg);
1571
class Thread::PlatformData : public Malloced {
1573
explicit PlatformData(HANDLE thread) : thread_(thread) {}
1575
unsigned thread_id_;
1579
// Initialize a Win32 thread object. The thread has an invalid thread
1580
// handle until it is started.
1582
Thread::Thread(const Options& options)
1583
: stack_size_(options.stack_size()) {
1584
data_ = new PlatformData(kNoThread);
1585
set_name(options.name());
1589
void Thread::set_name(const char* name) {
1590
OS::StrNCpy(Vector<char>(name_, sizeof(name_)), name, strlen(name));
1591
name_[sizeof(name_) - 1] = '\0';
1595
// Close our own handle for the thread.
1597
if (data_->thread_ != kNoThread) CloseHandle(data_->thread_);
1602
// Create a new thread. It is important to use _beginthreadex() instead of
1603
// the Win32 function CreateThread(), because the CreateThread() does not
1604
// initialize thread specific structures in the C runtime library.
1605
void Thread::Start() {
1606
data_->thread_ = reinterpret_cast<HANDLE>(
1607
_beginthreadex(NULL,
1608
static_cast<unsigned>(stack_size_),
1612
&data_->thread_id_));
1616
// Wait for thread to terminate.
1617
void Thread::Join() {
1618
if (data_->thread_id_ != GetCurrentThreadId()) {
1619
WaitForSingleObject(data_->thread_, INFINITE);
1624
Thread::LocalStorageKey Thread::CreateThreadLocalKey() {
1625
DWORD result = TlsAlloc();
1626
ASSERT(result != TLS_OUT_OF_INDEXES);
1627
return static_cast<LocalStorageKey>(result);
1631
void Thread::DeleteThreadLocalKey(LocalStorageKey key) {
1632
BOOL result = TlsFree(static_cast<DWORD>(key));
1638
void* Thread::GetThreadLocal(LocalStorageKey key) {
1639
return TlsGetValue(static_cast<DWORD>(key));
1643
void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
1644
BOOL result = TlsSetValue(static_cast<DWORD>(key), value);
1651
void Thread::YieldCPU() {
1656
// ----------------------------------------------------------------------------
1657
// Win32 mutex support.
1659
// On Win32 mutexes are implemented using CRITICAL_SECTION objects. These are
1660
// faster than Win32 Mutex objects because they are implemented using user mode
1661
// atomic instructions. Therefore we only do ring transitions if there is lock
1664
class Win32Mutex : public Mutex {
1666
Win32Mutex() { InitializeCriticalSection(&cs_); }
1668
virtual ~Win32Mutex() { DeleteCriticalSection(&cs_); }
1670
virtual int Lock() {
1671
EnterCriticalSection(&cs_);
1675
virtual int Unlock() {
1676
LeaveCriticalSection(&cs_);
1681
virtual bool TryLock() {
1682
// Returns non-zero if critical section is entered successfully entered.
1683
return TryEnterCriticalSection(&cs_);
1687
CRITICAL_SECTION cs_; // Critical section used for mutex
1691
Mutex* OS::CreateMutex() {
1692
return new Win32Mutex();
1696
// ----------------------------------------------------------------------------
1697
// Win32 semaphore support.
1699
// On Win32 semaphores are implemented using Win32 Semaphore objects. The
1700
// semaphores are anonymous. Also, the semaphores are initialized to have
1701
// no upper limit on count.
1704
class Win32Semaphore : public Semaphore {
1706
explicit Win32Semaphore(int count) {
1707
sem = ::CreateSemaphoreA(NULL, count, 0x7fffffff, NULL);
1715
WaitForSingleObject(sem, INFINITE);
1718
bool Wait(int timeout) {
1719
// Timeout in Windows API is in milliseconds.
1720
DWORD millis_timeout = timeout / 1000;
1721
return WaitForSingleObject(sem, millis_timeout) != WAIT_TIMEOUT;
1726
ReleaseSemaphore(sem, 1, &dummy);
1734
Semaphore* OS::CreateSemaphore(int count) {
1735
return new Win32Semaphore(count);
1739
// ----------------------------------------------------------------------------
1740
// Win32 socket support.
1743
class Win32Socket : public Socket {
1745
explicit Win32Socket() {
1746
// Create the socket.
1747
socket_ = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
1749
explicit Win32Socket(SOCKET socket): socket_(socket) { }
1750
virtual ~Win32Socket() { Shutdown(); }
1752
// Server initialization.
1753
bool Bind(const int port);
1754
bool Listen(int backlog) const;
1755
Socket* Accept() const;
1757
// Client initialization.
1758
bool Connect(const char* host, const char* port);
1760
// Shutdown socket for both read and write.
1763
// Data Transimission
1764
int Send(const char* data, int len) const;
1765
int Receive(char* data, int len) const;
1767
bool SetReuseAddress(bool reuse_address);
1769
bool IsValid() const { return socket_ != INVALID_SOCKET; }
1776
bool Win32Socket::Bind(const int port) {
1782
memset(&addr, 0, sizeof(addr));
1783
addr.sin_family = AF_INET;
1784
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
1785
addr.sin_port = htons(port);
1786
int status = bind(socket_,
1787
reinterpret_cast<struct sockaddr *>(&addr),
1793
bool Win32Socket::Listen(int backlog) const {
1798
int status = listen(socket_, backlog);
1803
Socket* Win32Socket::Accept() const {
1808
SOCKET socket = accept(socket_, NULL, NULL);
1809
if (socket == INVALID_SOCKET) {
1812
return new Win32Socket(socket);
1817
bool Win32Socket::Connect(const char* host, const char* port) {
1822
// Lookup host and port.
1823
struct addrinfo *result = NULL;
1824
struct addrinfo hints;
1825
memset(&hints, 0, sizeof(addrinfo));
1826
hints.ai_family = AF_INET;
1827
hints.ai_socktype = SOCK_STREAM;
1828
hints.ai_protocol = IPPROTO_TCP;
1829
int status = getaddrinfo(host, port, &hints, &result);
1835
status = connect(socket_,
1837
static_cast<int>(result->ai_addrlen));
1838
freeaddrinfo(result);
1843
bool Win32Socket::Shutdown() {
1845
// Shutdown socket for both read and write.
1846
int status = shutdown(socket_, SD_BOTH);
1847
closesocket(socket_);
1848
socket_ = INVALID_SOCKET;
1849
return status == SOCKET_ERROR;
1855
int Win32Socket::Send(const char* data, int len) const {
1856
if (len <= 0) return 0;
1858
while (written < len) {
1859
int status = send(socket_, data + written, len - written, 0);
1862
} else if (status > 0) {
1872
int Win32Socket::Receive(char* data, int len) const {
1873
if (len <= 0) return 0;
1874
int status = recv(socket_, data, len, 0);
1875
return (status == SOCKET_ERROR) ? 0 : status;
1879
bool Win32Socket::SetReuseAddress(bool reuse_address) {
1880
BOOL on = reuse_address ? true : false;
1881
int status = setsockopt(socket_, SOL_SOCKET, SO_REUSEADDR,
1882
reinterpret_cast<char*>(&on), sizeof(on));
1883
return status == SOCKET_ERROR;
1887
bool Socket::SetUp() {
1888
// Initialize Winsock32
1890
WSADATA winsock_data;
1891
WORD version_requested = MAKEWORD(1, 0);
1892
err = WSAStartup(version_requested, &winsock_data);
1894
PrintF("Unable to initialize Winsock, err = %d\n", Socket::LastError());
1901
int Socket::LastError() {
1902
return WSAGetLastError();
1906
uint16_t Socket::HToN(uint16_t value) {
1907
return htons(value);
1911
uint16_t Socket::NToH(uint16_t value) {
1912
return ntohs(value);
1916
uint32_t Socket::HToN(uint32_t value) {
1917
return htonl(value);
1921
uint32_t Socket::NToH(uint32_t value) {
1922
return ntohl(value);
1926
Socket* OS::CreateSocket() {
1927
return new Win32Socket();
1931
// ----------------------------------------------------------------------------
1932
// Win32 profiler support.
1934
class Sampler::PlatformData : public Malloced {
1936
// Get a handle to the calling thread. This is the thread that we are
1937
// going to profile. We need to make a copy of the handle because we are
1938
// going to use it in the sampler thread. Using GetThreadHandle() will
1939
// not work in this case. We're using OpenThread because DuplicateHandle
1940
// for some reason doesn't work in Chrome's sandbox.
1941
PlatformData() : profiled_thread_(OpenThread(THREAD_GET_CONTEXT |
1942
THREAD_SUSPEND_RESUME |
1943
THREAD_QUERY_INFORMATION,
1945
GetCurrentThreadId())) {}
1948
if (profiled_thread_ != NULL) {
1949
CloseHandle(profiled_thread_);
1950
profiled_thread_ = NULL;
1954
HANDLE profiled_thread() { return profiled_thread_; }
1957
HANDLE profiled_thread_;
1961
class SamplerThread : public Thread {
1963
static const int kSamplerThreadStackSize = 64 * KB;
1965
explicit SamplerThread(int interval)
1966
: Thread(Thread::Options("SamplerThread", kSamplerThreadStackSize)),
1967
interval_(interval) {}
1969
static void SetUp() { if (!mutex_) mutex_ = OS::CreateMutex(); }
1970
static void TearDown() { delete mutex_; }
1972
static void AddActiveSampler(Sampler* sampler) {
1973
ScopedLock lock(mutex_);
1974
SamplerRegistry::AddActiveSampler(sampler);
1975
if (instance_ == NULL) {
1976
instance_ = new SamplerThread(sampler->interval());
1979
ASSERT(instance_->interval_ == sampler->interval());
1983
static void RemoveActiveSampler(Sampler* sampler) {
1984
ScopedLock lock(mutex_);
1985
SamplerRegistry::RemoveActiveSampler(sampler);
1986
if (SamplerRegistry::GetState() == SamplerRegistry::HAS_NO_SAMPLERS) {
1987
RuntimeProfiler::StopRuntimeProfilerThreadBeforeShutdown(instance_);
1993
// Implement Thread::Run().
1994
virtual void Run() {
1995
SamplerRegistry::State state;
1996
while ((state = SamplerRegistry::GetState()) !=
1997
SamplerRegistry::HAS_NO_SAMPLERS) {
1998
bool cpu_profiling_enabled =
1999
(state == SamplerRegistry::HAS_CPU_PROFILING_SAMPLERS);
2000
bool runtime_profiler_enabled = RuntimeProfiler::IsEnabled();
2001
// When CPU profiling is enabled both JavaScript and C++ code is
2002
// profiled. We must not suspend.
2003
if (!cpu_profiling_enabled) {
2004
if (rate_limiter_.SuspendIfNecessary()) continue;
2006
if (cpu_profiling_enabled) {
2007
if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this)) {
2011
if (runtime_profiler_enabled) {
2012
if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, NULL)) {
2016
OS::Sleep(interval_);
2020
static void DoCpuProfile(Sampler* sampler, void* raw_sampler_thread) {
2021
if (!sampler->isolate()->IsInitialized()) return;
2022
if (!sampler->IsProfiling()) return;
2023
SamplerThread* sampler_thread =
2024
reinterpret_cast<SamplerThread*>(raw_sampler_thread);
2025
sampler_thread->SampleContext(sampler);
2028
static void DoRuntimeProfile(Sampler* sampler, void* ignored) {
2029
if (!sampler->isolate()->IsInitialized()) return;
2030
sampler->isolate()->runtime_profiler()->NotifyTick();
2033
void SampleContext(Sampler* sampler) {
2034
HANDLE profiled_thread = sampler->platform_data()->profiled_thread();
2035
if (profiled_thread == NULL) return;
2037
// Context used for sampling the register state of the profiled thread.
2039
memset(&context, 0, sizeof(context));
2041
TickSample sample_obj;
2042
TickSample* sample = CpuProfiler::TickSampleEvent(sampler->isolate());
2043
if (sample == NULL) sample = &sample_obj;
2045
static const DWORD kSuspendFailed = static_cast<DWORD>(-1);
2046
if (SuspendThread(profiled_thread) == kSuspendFailed) return;
2047
sample->state = sampler->isolate()->current_vm_state();
2049
context.ContextFlags = CONTEXT_FULL;
2050
if (GetThreadContext(profiled_thread, &context) != 0) {
2051
#if V8_HOST_ARCH_X64
2052
sample->pc = reinterpret_cast<Address>(context.Rip);
2053
sample->sp = reinterpret_cast<Address>(context.Rsp);
2054
sample->fp = reinterpret_cast<Address>(context.Rbp);
2056
sample->pc = reinterpret_cast<Address>(context.Eip);
2057
sample->sp = reinterpret_cast<Address>(context.Esp);
2058
sample->fp = reinterpret_cast<Address>(context.Ebp);
2060
sampler->SampleStack(sample);
2061
sampler->Tick(sample);
2063
ResumeThread(profiled_thread);
2066
const int interval_;
2067
RuntimeProfilerRateLimiter rate_limiter_;
2069
// Protects the process wide state below.
2070
static Mutex* mutex_;
2071
static SamplerThread* instance_;
2074
DISALLOW_COPY_AND_ASSIGN(SamplerThread);
2078
Mutex* SamplerThread::mutex_ = NULL;
2079
SamplerThread* SamplerThread::instance_ = NULL;
2083
// Seed the random number generator.
2084
// Convert the current time to a 64-bit integer first, before converting it
2085
// to an unsigned. Going directly can cause an overflow and the seed to be
2086
// set to all ones. The seed will be identical for different instances that
2087
// call this setup code within the same millisecond.
2088
uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis());
2089
srand(static_cast<unsigned int>(seed));
2090
limit_mutex = CreateMutex();
2091
SamplerThread::SetUp();
2095
void OS::TearDown() {
2096
SamplerThread::TearDown();
2101
Sampler::Sampler(Isolate* isolate, int interval)
2102
: isolate_(isolate),
2103
interval_(interval),
2107
data_ = new PlatformData;
2111
Sampler::~Sampler() {
2112
ASSERT(!IsActive());
2117
void Sampler::Start() {
2118
ASSERT(!IsActive());
2120
SamplerThread::AddActiveSampler(this);
2124
void Sampler::Stop() {
2126
SamplerThread::RemoveActiveSampler(this);
2131
} } // namespace v8::internal
added
removed
src/third_party/v8/src/platform-win32.cc
