update sources

1 files changed, 925 insertions, 0 deletions

diff --git a/0004_hurd.patch b/0004_hurd.patch
new file mode 100644
index 000000000000..5a5519cec240
--- /dev/null
+++ b/0004_hurd.patch
@@ -0,0 +1,925 @@
+Description: hurd-i386 support
+ https://bugs.debian.org/747246
+Author: Svante Signell <svante.signell@gmail.com>
+Acked-By: Jérémy Lal <kapouer@melix.org>
+Last-Update: 2014-05-06
+
+---
+ src/platform-gnu.cc | 890 ++++++++++++++++++++++++++++++++++++++++++++++++++++
+ tools/gyp/v8.gyp    |  11 +
+ 2 files changed, 901 insertions(+)
+ create mode 100644 src/platform-gnu.cc
+
+--- /dev/null
++++ b/src/platform-gnu.cc
+@@ -0,0 +1,890 @@
++// Copyright 2012 the V8 project authors. All rights reserved.
++// Redistribution and use in source and binary forms, with or without
++// modification, are permitted provided that the following conditions are
++// met:
++//
++//     * Redistributions of source code must retain the above copyright
++//       notice, this list of conditions and the following disclaimer.
++//     * Redistributions in binary form must reproduce the above
++//       copyright notice, this list of conditions and the following
++//       disclaimer in the documentation and/or other materials provided
++//       with the distribution.
++//     * Neither the name of Google Inc. nor the names of its
++//       contributors may be used to endorse or promote products derived
++//       from this software without specific prior written permission.
++//
++// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
++// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
++// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
++// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
++// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
++// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
++// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
++// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
++// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
++// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
++// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
++
++// Platform specific code for GNU/Hurd goes here. For the POSIX comaptible parts
++// the implementation is in platform-posix.cc.
++
++#include <pthread.h>
++#include <semaphore.h>
++#include <signal.h>
++#include <sys/time.h>
++#include <sys/resource.h>
++#include <sys/types.h>
++#include <sys/ucontext.h>
++#include <stdlib.h>
++
++#include <sys/types.h>  // mmap & munmap
++#include <sys/mman.h>   // mmap & munmap
++#include <sys/stat.h>   // open
++#include <sys/fcntl.h>  // open
++#include <unistd.h>     // getpagesize
++// If you don't have execinfo.h then you need devel/libexecinfo from ports.
++#include <execinfo.h>   // backtrace, backtrace_symbols
++#include <strings.h>    // index
++#include <errno.h>
++#include <stdarg.h>
++#include <limits.h>
++
++#undef MAP_TYPE
++
++#include "v8.h"
++#include "v8threads.h"
++
++#include "platform-posix.h"
++#include "platform.h"
++#include "vm-state-inl.h"
++
++#ifndef MAP_NORESERVE
++#define MAP_NORESERVE 0
++#endif
++
++namespace v8 {
++namespace internal {
++
++// 0 is never a valid thread id on GNU/Hurd
++static const pthread_t kNoThread = (pthread_t) 0;
++
++
++double ceiling(double x) {
++  return ceil(x);
++}
++
++
++static Mutex* limit_mutex = NULL;
++
++
++void OS::PostSetUp() {
++  POSIXPostSetUp();
++}
++
++
++void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) {
++  __asm__ __volatile__("" : : : "memory");
++  *ptr = value;
++}
++
++
++uint64_t OS::CpuFeaturesImpliedByPlatform() {
++  return 0;  // GNU/Hurd runs on anything.
++}
++
++
++int OS::ActivationFrameAlignment() {
++  // 16 byte alignment on GNU/Hurd
++  return 16;
++}
++
++
++const char* OS::LocalTimezone(double time) {
++  if (isnan(time)) return "";
++  time_t tv = static_cast<time_t>(floor(time/msPerSecond));
++  struct tm* t = localtime(&tv);
++  if (NULL == t) return "";
++  return t->tm_zone;
++}
++
++
++double OS::LocalTimeOffset() {
++  time_t tv = time(NULL);
++  struct tm* t = localtime(&tv);
++  // tm_gmtoff includes any daylight savings offset, so subtract it.
++  return static_cast<double>(t->tm_gmtoff * msPerSecond -
++                             (t->tm_isdst > 0 ? 3600 * msPerSecond : 0));
++}
++
++
++// 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, i.e., 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* address) {
++  return address < lowest_ever_allocated || address >= highest_ever_allocated;
++}
++
++
++size_t OS::AllocateAlignment() {
++  return getpagesize();
++}
++
++
++void* OS::Allocate(const size_t requested,
++                   size_t* allocated,
++                   bool executable) {
++  const size_t msize = RoundUp(requested, getpagesize());
++  int prot = PROT_READ | PROT_WRITE | (executable ? PROT_EXEC : 0);
++  void* mbase = mmap(NULL, msize, prot, MAP_PRIVATE | MAP_ANON, -1, 0);
++
++  if (mbase == MAP_FAILED) {
++    LOG(ISOLATE, StringEvent("OS::Allocate", "mmap failed"));
++    return NULL;
++  }
++  *allocated = msize;
++  UpdateAllocatedSpaceLimits(mbase, msize);
++  return mbase;
++}
++
++
++void OS::Free(void* buf, const size_t length) {
++  // TODO(1240712): munmap has a return value which is ignored here.
++  int result = munmap(buf, length);
++  USE(result);
++  ASSERT(result == 0);
++}
++
++
++void OS::Sleep(int milliseconds) {
++  unsigned int ms = static_cast<unsigned int>(milliseconds);
++  usleep(1000 * ms);
++}
++
++
++void OS::Abort() {
++  // Redirect to std abort to signal abnormal program termination.
++  abort();
++}
++
++
++void OS::DebugBreak() {
++#if (defined(__arm__) || defined(__thumb__))
++# if defined(CAN_USE_ARMV5_INSTRUCTIONS)
++  asm("bkpt 0");
++# endif
++#else
++  asm("int $3");
++#endif
++}
++
++
++class PosixMemoryMappedFile : public OS::MemoryMappedFile {
++ public:
++  PosixMemoryMappedFile(FILE* file, void* memory, int size)
++    : file_(file), memory_(memory), size_(size) { }
++  virtual ~PosixMemoryMappedFile();
++  virtual void* memory() { return memory_; }
++  virtual int size() { return size_; }
++ private:
++  FILE* file_;
++  void* memory_;
++  int size_;
++};
++
++
++OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) {
++  FILE* file = fopen(name, "r+");
++  if (file == NULL) return NULL;
++
++  fseek(file, 0, SEEK_END);
++  int size = ftell(file);
++
++  void* memory =
++      mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0);
++  return new PosixMemoryMappedFile(file, memory, size);
++}
++
++
++OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size,
++    void* initial) {
++  FILE* file = fopen(name, "w+");
++  if (file == NULL) return NULL;
++  int result = fwrite(initial, size, 1, file);
++  if (result < 1) {
++    fclose(file);
++    return NULL;
++  }
++  void* memory =
++      mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fileno(file), 0);
++  return new PosixMemoryMappedFile(file, memory, size);
++}
++
++
++PosixMemoryMappedFile::~PosixMemoryMappedFile() {
++  if (memory_) munmap(memory_, size_);
++  fclose(file_);
++}
++
++
++static unsigned StringToLong(char* buffer) {
++  return static_cast<unsigned>(strtol(buffer, NULL, 16));  // NOLINT
++}
++
++
++void OS::LogSharedLibraryAddresses() {
++  static const int MAP_LENGTH = 1024;
++  int fd = open("/proc/self/maps", O_RDONLY);
++  if (fd < 0) return;
++  while (true) {
++    char addr_buffer[11];
++    addr_buffer[0] = '0';
++    addr_buffer[1] = 'x';
++    addr_buffer[10] = 0;
++    int result = read(fd, addr_buffer + 2, 8);
++    if (result < 8) break;
++    unsigned start = StringToLong(addr_buffer);
++    result = read(fd, addr_buffer + 2, 1);
++    if (result < 1) break;
++    if (addr_buffer[2] != '-') break;
++    result = read(fd, addr_buffer + 2, 8);
++    if (result < 8) break;
++    unsigned end = StringToLong(addr_buffer);
++    char buffer[MAP_LENGTH];
++    int bytes_read = -1;
++    do {
++      bytes_read++;
++      if (bytes_read >= MAP_LENGTH - 1)
++        break;
++      result = read(fd, buffer + bytes_read, 1);
++      if (result < 1) break;
++    } while (buffer[bytes_read] != '\n');
++    buffer[bytes_read] = 0;
++    // Ignore mappings that are not executable.
++    if (buffer[3] != 'x') continue;
++    char* start_of_path = index(buffer, '/');
++    // There may be no filename in this line.  Skip to next.
++    if (start_of_path == NULL) continue;
++    buffer[bytes_read] = 0;
++    LOG(i::Isolate::Current(), SharedLibraryEvent(start_of_path, start, end));
++  }
++  close(fd);
++}
++
++
++void OS::SignalCodeMovingGC() {
++}
++
++
++int OS::StackWalk(Vector<OS::StackFrame> frames) {
++  int frames_size = frames.length();
++  ScopedVector<void*> addresses(frames_size);
++
++  int frames_count = backtrace(addresses.start(), frames_size);
++
++  char** symbols = backtrace_symbols(addresses.start(), frames_count);
++  if (symbols == NULL) {
++    return kStackWalkError;
++  }
++
++  for (int i = 0; i < frames_count; i++) {
++    frames[i].address = addresses[i];
++    // Format a text representation of the frame based on the information
++    // available.
++    SNPrintF(MutableCStrVector(frames[i].text, kStackWalkMaxTextLen),
++             "%s",
++             symbols[i]);
++    // Make sure line termination is in place.
++    frames[i].text[kStackWalkMaxTextLen - 1] = '\0';
++  }
++
++  free(symbols);
++
++  return frames_count;
++}
++
++
++// Constants used for mmap.
++static const int kMmapFd = -1;
++static const int kMmapFdOffset = 0;
++
++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* reservation = mmap(OS::GetRandomMmapAddr(),
++                           request_size,
++                           PROT_NONE,
++                           MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
++                           kMmapFd,
++                           kMmapFdOffset);
++  if (reservation == MAP_FAILED) return;
++
++  Address base = static_cast<Address>(reservation);
++  Address aligned_base = RoundUp(base, alignment);
++  ASSERT_LE(base, aligned_base);
++
++  // Unmap extra memory reserved before and after the desired block.
++  if (aligned_base != base) {
++    size_t prefix_size = static_cast<size_t>(aligned_base - base);
++    OS::Free(base, prefix_size);
++    request_size -= prefix_size;
++  }
++
++  size_t aligned_size = RoundUp(size, OS::AllocateAlignment());
++  ASSERT_LE(aligned_size, request_size);
++
++  if (aligned_size != request_size) {
++    size_t suffix_size = request_size - aligned_size;
++    OS::Free(aligned_base + aligned_size, suffix_size);
++    request_size -= suffix_size;
++  }
++
++  ASSERT(aligned_size == request_size);
++
++  address_ = static_cast<void*>(aligned_base);
++  size_ = aligned_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) {
++  return CommitRegion(address, size, is_executable);
++}
++
++
++bool VirtualMemory::Uncommit(void* address, size_t size) {
++  return UncommitRegion(address, size);
++}
++
++
++bool VirtualMemory::Guard(void* address) {
++  OS::Guard(address, OS::CommitPageSize());
++  return true;
++}
++
++
++void* VirtualMemory::ReserveRegion(size_t size) {
++  void* result = mmap(OS::GetRandomMmapAddr(),
++                      size,
++                      PROT_NONE,
++                      MAP_PRIVATE | MAP_ANON | MAP_NORESERVE,
++                      kMmapFd,
++                      kMmapFdOffset);
++
++  if (result == MAP_FAILED) return NULL;
++
++  return result;
++}
++
++
++bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
++  int prot = PROT_READ | PROT_WRITE | (is_executable ? PROT_EXEC : 0);
++  if (MAP_FAILED == mmap(base,
++                         size,
++                         prot,
++                         MAP_PRIVATE | MAP_ANON | MAP_FIXED,
++                         kMmapFd,
++                         kMmapFdOffset)) {
++    return false;
++  }
++
++  UpdateAllocatedSpaceLimits(base, size);
++  return true;
++}
++
++
++bool VirtualMemory::UncommitRegion(void* base, size_t size) {
++  return mmap(base,
++              size,
++              PROT_NONE,
++              MAP_PRIVATE | MAP_ANON | MAP_NORESERVE | MAP_FIXED,
++              kMmapFd,
++              kMmapFdOffset) != MAP_FAILED;
++}
++
++
++bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
++  return munmap(base, size) == 0;
++}
++
++
++class Thread::PlatformData : public Malloced {
++ public:
++  pthread_t thread_;  // Thread handle for pthread.
++};
++
++
++Thread::Thread(const Options& options)
++    : data_(new PlatformData),
++      stack_size_(options.stack_size()) {
++  set_name(options.name());
++}
++
++
++Thread::~Thread() {
++  delete data_;
++}
++
++
++static void* ThreadEntry(void* arg) {
++  Thread* thread = reinterpret_cast<Thread*>(arg);
++  // This is also initialized by the first argument to pthread_create() but we
++  // don't know which thread will run first (the original thread or the new
++  // one) so we initialize it here too.
++  thread->data()->thread_ = pthread_self();
++  ASSERT(thread->data()->thread_ != kNoThread);
++  thread->Run();
++  return NULL;
++}
++
++
++void Thread::set_name(const char* name) {
++  strncpy(name_, name, sizeof(name_));
++  name_[sizeof(name_) - 1] = '\0';
++}
++
++
++void Thread::Start() {
++  pthread_attr_t* attr_ptr = NULL;
++  pthread_attr_t attr;
++  if (stack_size_ > 0) {
++    pthread_attr_init(&attr);
++    pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_));
++    attr_ptr = &attr;
++  }
++  pthread_create(&data_->thread_, attr_ptr, ThreadEntry, this);
++  ASSERT(data_->thread_ != kNoThread);
++}
++
++
++void Thread::Join() {
++  pthread_join(data_->thread_, NULL);
++}
++
++
++Thread::LocalStorageKey Thread::CreateThreadLocalKey() {
++  pthread_key_t key;
++  int result = pthread_key_create(&key, NULL);
++  USE(result);
++  ASSERT(result == 0);
++  return static_cast<LocalStorageKey>(key);
++}
++
++
++void Thread::DeleteThreadLocalKey(LocalStorageKey key) {
++  pthread_key_t pthread_key = static_cast<pthread_key_t>(key);
++  int result = pthread_key_delete(pthread_key);
++  USE(result);
++  ASSERT(result == 0);
++}
++
++
++void* Thread::GetThreadLocal(LocalStorageKey key) {
++  pthread_key_t pthread_key = static_cast<pthread_key_t>(key);
++  return pthread_getspecific(pthread_key);
++}
++
++
++void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
++  pthread_key_t pthread_key = static_cast<pthread_key_t>(key);
++  pthread_setspecific(pthread_key, value);
++}
++
++
++void Thread::YieldCPU() {
++  sched_yield();
++}
++
++
++class GNUMutex : public Mutex {
++ public:
++  GNUMutex() {
++    pthread_mutexattr_t attrs;
++    int result = pthread_mutexattr_init(&attrs);
++    ASSERT(result == 0);
++    result = pthread_mutexattr_settype(&attrs, PTHREAD_MUTEX_RECURSIVE);
++    ASSERT(result == 0);
++    result = pthread_mutex_init(&mutex_, &attrs);
++    ASSERT(result == 0);
++    USE(result);
++  }
++
++  virtual ~GNUMutex() { pthread_mutex_destroy(&mutex_); }
++
++  virtual int Lock() {
++    int result = pthread_mutex_lock(&mutex_);
++    return result;
++  }
++
++  virtual int Unlock() {
++    int result = pthread_mutex_unlock(&mutex_);
++    return result;
++  }
++
++  virtual bool TryLock() {
++    int result = pthread_mutex_trylock(&mutex_);
++    // Return false if the lock is busy and locking failed.
++    if (result == EBUSY) {
++      return false;
++    }
++    ASSERT(result == 0);  // Verify no other errors.
++    return true;
++  }
++
++ private:
++  pthread_mutex_t mutex_;   // Pthread mutex for POSIX platforms.
++};
++
++
++Mutex* OS::CreateMutex() {
++  return new GNUMutex();
++}
++
++
++class GNUSemaphore : public Semaphore {
++ public:
++  explicit GNUSemaphore(int count) {  sem_init(&sem_, 0, count); }
++  virtual ~GNUSemaphore() { sem_destroy(&sem_); }
++
++  virtual void Wait();
++  virtual bool Wait(int timeout);
++  virtual void Signal() { sem_post(&sem_); }
++ private:
++  sem_t sem_;
++};
++
++
++void GNUSemaphore::Wait() {
++  while (true) {
++    int result = sem_wait(&sem_);
++    if (result == 0) return;  // Successfully got semaphore.
++    CHECK(result == -1 && errno == EINTR);  // Signal caused spurious wakeup.
++  }
++}
++
++
++bool GNUSemaphore::Wait(int timeout) {
++  const long kOneSecondMicros = 1000000;  // NOLINT
++
++  // Split timeout into second and nanosecond parts.
++  struct timeval delta;
++  delta.tv_usec = timeout % kOneSecondMicros;
++  delta.tv_sec = timeout / kOneSecondMicros;
++
++  struct timeval current_time;
++  // Get the current time.
++  if (gettimeofday(&current_time, NULL) == -1) {
++    return false;
++  }
++
++  // Calculate time for end of timeout.
++  struct timeval end_time;
++  timeradd(&current_time, &delta, &end_time);
++
++  struct timespec ts;
++  TIMEVAL_TO_TIMESPEC(&end_time, &ts);
++  while (true) {
++    int result = sem_timedwait(&sem_, &ts);
++    if (result == 0) return true;  // Successfully got semaphore.
++    if (result == -1 && errno == ETIMEDOUT) return false;  // Timeout.
++    CHECK(result == -1 && errno == EINTR);  // Signal caused spurious wakeup.
++  }
++}
++
++
++Semaphore* OS::CreateSemaphore(int count) {
++  return new GNUSemaphore(count);
++}
++
++
++static pthread_t GetThreadID() {
++  pthread_t thread_id = pthread_self();
++  return thread_id;
++}
++
++
++class Sampler::PlatformData : public Malloced {
++ public:
++  PlatformData() : vm_tid_(GetThreadID()) {}
++
++  pthread_t vm_tid() const { return vm_tid_; }
++
++ private:
++  pthread_t vm_tid_;
++};
++
++
++static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) {
++  USE(info);
++  if (signal != SIGPROF) return;
++  Isolate* isolate = Isolate::UncheckedCurrent();
++  if (isolate == NULL || !isolate->IsInitialized() || !isolate->IsInUse()) {
++    // We require a fully initialized and entered isolate.
++    return;
++  }
++  if (v8::Locker::IsActive() &&
++      !isolate->thread_manager()->IsLockedByCurrentThread()) {
++    return;
++  }
++
++  Sampler* sampler = isolate->logger()->sampler();
++  if (sampler == NULL || !sampler->IsActive()) return;
++
++  TickSample sample_obj;
++  TickSample* sample = CpuProfiler::TickSampleEvent(isolate);
++  if (sample == NULL) sample = &sample_obj;
++
++  // Extracting the sample from the context is extremely machine dependent.
++  ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context);
++  mcontext_t& mcontext = ucontext->uc_mcontext;
++  sample->state = isolate->current_vm_state();
++#if V8_HOST_ARCH_IA32
++  sample->pc = reinterpret_cast<Address>(mcontext.gregs[REG_EIP]);
++  sample->sp = reinterpret_cast<Address>(mcontext.gregs[REG_ESP]);
++  sample->fp = reinterpret_cast<Address>(mcontext.gregs[REG_EBP]);
++#endif
++  sampler->SampleStack(sample);
++  sampler->Tick(sample);
++}
++
++
++class SignalSender : public Thread {
++ public:
++  enum SleepInterval {
++    HALF_INTERVAL,
++    FULL_INTERVAL
++  };
++
++  static const int kSignalSenderStackSize = 64 * KB;
++
++  explicit SignalSender(int interval)
++      : Thread(Thread::Options("SignalSender", kSignalSenderStackSize)),
++        interval_(interval) {}
++
++  static void SetUp() { if (!mutex_) mutex_ = OS::CreateMutex(); }
++  static void TearDown() { delete mutex_; }
++
++  static void AddActiveSampler(Sampler* sampler) {
++    ScopedLock lock(mutex_);
++    SamplerRegistry::AddActiveSampler(sampler);
++    if (instance_ == NULL) {
++      // Install a signal handler.
++      struct sigaction sa;
++      sa.sa_sigaction = ProfilerSignalHandler;
++      sigemptyset(&sa.sa_mask);
++      sa.sa_flags = SA_RESTART | SA_SIGINFO;
++      signal_handler_installed_ =
++          (sigaction(SIGPROF, &sa, &old_signal_handler_) == 0);
++
++      // Start a thread that sends SIGPROF signal to VM threads.
++      instance_ = new SignalSender(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;
++
++      // Restore the old signal handler.
++      if (signal_handler_installed_) {
++        sigaction(SIGPROF, &old_signal_handler_, 0);
++        signal_handler_installed_ = false;
++      }
++    }
++  }
++
++  // 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 && runtime_profiler_enabled) {
++        if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this)) {
++          return;
++        }
++        Sleep(HALF_INTERVAL);
++        if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile, NULL)) {
++          return;
++        }
++        Sleep(HALF_INTERVAL);
++      } else {
++        if (cpu_profiling_enabled) {
++          if (!SamplerRegistry::IterateActiveSamplers(&DoCpuProfile,
++                                                      this)) {
++            return;
++          }
++        }
++        if (runtime_profiler_enabled) {
++          if (!SamplerRegistry::IterateActiveSamplers(&DoRuntimeProfile,
++                                                      NULL)) {
++            return;
++          }
++        }
++        Sleep(FULL_INTERVAL);
++      }
++    }
++  }
++
++  static void DoCpuProfile(Sampler* sampler, void* raw_sender) {
++    if (!sampler->IsProfiling()) return;
++    SignalSender* sender = reinterpret_cast<SignalSender*>(raw_sender);
++    sender->SendProfilingSignal(sampler->platform_data()->vm_tid());
++  }
++
++  static void DoRuntimeProfile(Sampler* sampler, void* ignored) {
++    if (!sampler->isolate()->IsInitialized()) return;
++    sampler->isolate()->runtime_profiler()->NotifyTick();
++  }
++
++  void SendProfilingSignal(pthread_t tid) {
++    if (!signal_handler_installed_) return;
++    pthread_kill(tid, SIGPROF);
++  }
++
++  void Sleep(SleepInterval full_or_half) {
++    // Convert ms to us and subtract 100 us to compensate delays
++    // occuring during signal delivery.
++    useconds_t interval = interval_ * 1000 - 100;
++    if (full_or_half == HALF_INTERVAL) interval /= 2;
++    int result = usleep(interval);
++#ifdef DEBUG
++    if (result != 0 && errno != EINTR) {
++      fprintf(stderr,
++              "SignalSender usleep error; interval = %u, errno = %d\n",
++              interval,
++              errno);
++      ASSERT(result == 0 || errno == EINTR);
++    }
++#endif
++    USE(result);
++  }
++
++  const int interval_;
++  RuntimeProfilerRateLimiter rate_limiter_;
++
++  // Protects the process wide state below.
++  static Mutex* mutex_;
++  static SignalSender* instance_;
++  static bool signal_handler_installed_;
++  static struct sigaction old_signal_handler_;
++
++ private:
++  DISALLOW_COPY_AND_ASSIGN(SignalSender);
++};
++
++Mutex* SignalSender::mutex_ = NULL;
++SignalSender* SignalSender::instance_ = NULL;
++struct sigaction SignalSender::old_signal_handler_;
++bool SignalSender::signal_handler_installed_ = false;
++
++
++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());
++  srandom(static_cast<unsigned int>(seed));
++  limit_mutex = CreateMutex();
++  SignalSender::SetUp();
++}
++
++
++void OS::TearDown() {
++  SignalSender::TearDown();
++  delete limit_mutex;
++}
++
++
++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);
++  SignalSender::AddActiveSampler(this);
++}
++
++
++void Sampler::Stop() {
++  ASSERT(IsActive());
++  SignalSender::RemoveActiveSampler(this);
++  SetActive(false);
++}
++
++
++} }  // namespace v8::internal
+--- a/tools/gyp/v8.gyp
++++ b/tools/gyp/v8.gyp
+@@ -723,6 +723,17 @@
+                 '../../src/platform-posix.cc'
+               ]},
+             ],
++            ['OS=="hurd"', {
++                'link_settings': {
++                  'libraries': [
++                    '-lpthread',
++                ]},
++                'sources': [
++                  '../../src/platform-gnu.cc',
++                  '../../src/platform-posix.cc'
++                ],
++              }
++            ],
+             ['OS=="win"', {
+               'sources': [
+                 '../../src/platform-win32.cc',