Merge isolates to bleeding_edge.

src/log.cc

 // Copyright 2009 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
@@ skipping 46 matching lines @@
   void AddState(StateTag state);
 
  private:
   static const int kBufferSize = 256;
   int current_index_;
   bool is_full_;
   byte buffer_[kBufferSize];
 
 
   void IncrementStateCounter(StateTag state) {
-    Counters::state_counters[state].Increment();
+    COUNTERS->state_counters(state)->Increment();
   }
 
 
   void DecrementStateCounter(StateTag state) {
-    Counters::state_counters[state].Decrement();
+    COUNTERS->state_counters(state)->Decrement();
   }
 };
 
 
 //
 // The Profiler samples pc and sp values for the main thread.
 // Each sample is appended to a circular buffer.
 // An independent thread removes data and writes it to the log.
 // This design minimizes the time spent in the sampler.
 //
 class Profiler: public Thread {
  public:
-  Profiler();
+  explicit Profiler(Isolate* isolate);
   void Engage();
   void Disengage();
 
   // Inserts collected profiling data into buffer.
   void Insert(TickSample* sample) {
     if (paused_)
       return;
 
     if (Succ(head_) == tail_) {
       overflow_ = true;
@@ skipping 10 matching lines @@
     *sample = buffer_[tail_];
     bool result = overflow_;
     tail_ = Succ(tail_);
     overflow_ = false;
     return result;
   }
 
   void Run();
 
   // Pause and Resume TickSample data collection.
-  static bool paused() { return paused_; }
-  static void pause() { paused_ = true; }
-  static void resume() { paused_ = false; }
+  bool paused() const { return paused_; }
+  void pause() { paused_ = true; }
+  void resume() { paused_ = false; }
 
  private:
   // Returns the next index in the cyclic buffer.
   int Succ(int index) { return (index + 1) % kBufferSize; }
 
   // Cyclic buffer for communicating profiling samples
   // between the signal handler and the worker thread.
   static const int kBufferSize = 128;
   TickSample buffer_[kBufferSize];  // Buffer storage.
   int head_;  // Index to the buffer head.
   int tail_;  // Index to the buffer tail.
   bool overflow_;  // Tell whether a buffer overflow has occurred.
   Semaphore* buffer_semaphore_;  // Sempahore used for buffer synchronization.
 
   // Tells whether profiler is engaged, that is, processing thread is stated.
   bool engaged_;
 
   // Tells whether worker thread should continue running.
   bool running_;
 
   // Tells whether we are currently recording tick samples.
-  static bool paused_;
+  bool paused_;
 };
 
-bool Profiler::paused_ = false;
-
 
 //
 // StackTracer implementation
 //
-void StackTracer::Trace(TickSample* sample) {
+void StackTracer::Trace(Isolate* isolate, TickSample* sample) {
+  ASSERT(isolate->IsInitialized());
+
   sample->tos = NULL;
   sample->frames_count = 0;
 
   // Avoid collecting traces while doing GC.
   if (sample->state == GC) return;
 
-  const Address js_entry_sp = Top::js_entry_sp(Top::GetCurrentThread());
+  const Address js_entry_sp =
+      Isolate::js_entry_sp(isolate->thread_local_top());
   if (js_entry_sp == 0) {
     // Not executing JS now.
     return;
   }
 
   // Sample potential return address value for frameless invocation of
   // stubs (we'll figure out later, if this value makes sense).
   sample->tos = Memory::Address_at(sample->sp);
 
   int i = 0;
-  const Address callback = Top::external_callback();
+  const Address callback = isolate->external_callback();
   // Surprisingly, PC can point _exactly_ to callback start, with good
   // probability, and this will result in reporting fake nested
   // callback call.
   if (callback != NULL && callback != sample->pc) {
     sample->stack[i++] = callback;
   }
 
-  SafeStackTraceFrameIterator it(sample->fp, sample->sp,
+  SafeStackTraceFrameIterator it(isolate,
+                                 sample->fp, sample->sp,
                                  sample->sp, js_entry_sp);
   while (!it.done() && i < TickSample::kMaxFramesCount) {
     sample->stack[i++] = it.frame()->pc();
     it.Advance();
   }
   sample->frames_count = i;
 }
 
 
 //
 // Ticker used to provide ticks to the profiler and the sliding state
 // window.
 //
 class Ticker: public Sampler {
  public:
-  explicit Ticker(int interval) :
-      Sampler(interval),
+  explicit Ticker(Isolate* isolate, int interval):
+      Sampler(isolate, interval),
       window_(NULL),
       profiler_(NULL) {}
 
   ~Ticker() { if (IsActive()) Stop(); }
 
   virtual void Tick(TickSample* sample) {
     if (profiler_) profiler_->Insert(sample);
     if (window_) window_->AddState(sample->state);
   }
 
@@ skipping 15 matching lines @@
   }
 
   void ClearProfiler() {
     DecreaseProfilingDepth();
     profiler_ = NULL;
     if (!window_ && IsActive() && !RuntimeProfiler::IsEnabled()) Stop();
   }
 
  protected:
   virtual void DoSampleStack(TickSample* sample) {
-    StackTracer::Trace(sample);
+    StackTracer::Trace(isolate(), sample);
   }
 
  private:
   SlidingStateWindow* window_;
   Profiler* profiler_;
 };
 
 
 //
 // SlidingStateWindow implementation.
 //
 SlidingStateWindow::SlidingStateWindow(): current_index_(0), is_full_(false) {
   for (int i = 0; i < kBufferSize; i++) {
     buffer_[i] = static_cast<byte>(OTHER);
   }
-  Logger::ticker_->SetWindow(this);
+  LOGGER->ticker_->SetWindow(this);
 }
 
 
 SlidingStateWindow::~SlidingStateWindow() {
-  Logger::ticker_->ClearWindow();
+  LOGGER->ticker_->ClearWindow();
 }
 
 
 void SlidingStateWindow::AddState(StateTag state) {
   if (is_full_) {
     DecrementStateCounter(static_cast<StateTag>(buffer_[current_index_]));
   } else if (current_index_ == kBufferSize - 1) {
     is_full_ = true;
   }
   buffer_[current_index_] = static_cast<byte>(state);
   IncrementStateCounter(state);
   ASSERT(IsPowerOf2(kBufferSize));
   current_index_ = (current_index_ + 1) & (kBufferSize - 1);
 }
 
 
 //
 // Profiler implementation.
 //
-Profiler::Profiler()
-    : Thread("v8:Profiler"),
+Profiler::Profiler(Isolate* isolate)
+    : Thread(isolate, "v8:Profiler"),
       head_(0),
       tail_(0),
       overflow_(false),
       buffer_semaphore_(OS::CreateSemaphore(0)),
       engaged_(false),
-      running_(false) {
+      running_(false),
+      paused_(false) {
 }
 
 
 void Profiler::Engage() {
   if (engaged_) return;
   engaged_ = true;
 
   // TODO(mnaganov): This is actually "Chromium" mode. Flags need to be revised.
   // http://code.google.com/p/v8/issues/detail?id=487
   if (!FLAG_prof_lazy) {
     OS::LogSharedLibraryAddresses();
   }
 
   // Start thread processing the profiler buffer.
   running_ = true;
   Start();
 
   // Register to get ticks.
-  Logger::ticker_->SetProfiler(this);
+  LOGGER->ticker_->SetProfiler(this);
 
-  Logger::ProfilerBeginEvent();
+  LOGGER->ProfilerBeginEvent();
 }
 
 
 void Profiler::Disengage() {
   if (!engaged_) return;
 
   // Stop receiving ticks.
-  Logger::ticker_->ClearProfiler();
+  LOGGER->ticker_->ClearProfiler();
 
   // Terminate the worker thread by setting running_ to false,
   // inserting a fake element in the queue and then wait for
   // the thread to terminate.
   running_ = false;
   TickSample sample;
   // Reset 'paused_' flag, otherwise semaphore may not be signalled.
   resume();
   Insert(&sample);
   Join();
 
-  LOG(UncheckedStringEvent("profiler", "end"));
+  LOG(ISOLATE, UncheckedStringEvent("profiler", "end"));
 }
 
 
 void Profiler::Run() {
   TickSample sample;
   bool overflow = Remove(&sample);
+  i::Isolate* isolate = ISOLATE;
   while (running_) {
-    LOG(TickEvent(&sample, overflow));
+    LOG(isolate, TickEvent(&sample, overflow));
     overflow = Remove(&sample);
   }
 }
 
 
 //
 // Logger class implementation.
 //
-Ticker* Logger::ticker_ = NULL;
-Profiler* Logger::profiler_ = NULL;
-SlidingStateWindow* Logger::sliding_state_window_ = NULL;
-int Logger::logging_nesting_ = 0;
-int Logger::cpu_profiler_nesting_ = 0;
-int Logger::heap_profiler_nesting_ = 0;
+
+Logger::Logger()
+  : ticker_(NULL),
+    profiler_(NULL),
+    sliding_state_window_(NULL),
+    log_events_(NULL),
+    logging_nesting_(0),
+    cpu_profiler_nesting_(0),
+    heap_profiler_nesting_(0),
+    log_(new Log(this)),
+    is_initialized_(false),
+    last_address_(NULL),
+    prev_sp_(NULL),
+    prev_function_(NULL),
+    prev_to_(NULL),
+    prev_code_(NULL) {
+}
+
+Logger::~Logger() {
+  delete log_;
+}
 
 #define DECLARE_EVENT(ignore1, name) name,
-const char* kLogEventsNames[Logger::NUMBER_OF_LOG_EVENTS] = {
+static const char* const kLogEventsNames[Logger::NUMBER_OF_LOG_EVENTS] = {
   LOG_EVENTS_AND_TAGS_LIST(DECLARE_EVENT)
 };
 #undef DECLARE_EVENT
 
 
 void Logger::ProfilerBeginEvent() {
-  if (!Log::IsEnabled()) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled()) return;
+  LogMessageBuilder msg(this);
   msg.Append("profiler,\"begin\",%d\n", kSamplingIntervalMs);
   msg.WriteToLogFile();
 }
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 
 void Logger::StringEvent(const char* name, const char* value) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (FLAG_log) UncheckedStringEvent(name, value);
 #endif
 }
 
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 void Logger::UncheckedStringEvent(const char* name, const char* value) {
-  if (!Log::IsEnabled()) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled()) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,\"%s\"\n", name, value);
   msg.WriteToLogFile();
 }
 #endif
 
 
 void Logger::IntEvent(const char* name, int value) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (FLAG_log) UncheckedIntEvent(name, value);
 #endif
 }
 
 
 void Logger::IntPtrTEvent(const char* name, intptr_t value) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (FLAG_log) UncheckedIntPtrTEvent(name, value);
 #endif
 }
 
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 void Logger::UncheckedIntEvent(const char* name, int value) {
-  if (!Log::IsEnabled()) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled()) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,%d\n", name, value);
   msg.WriteToLogFile();
 }
 #endif
 
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 void Logger::UncheckedIntPtrTEvent(const char* name, intptr_t value) {
-  if (!Log::IsEnabled()) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled()) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,%" V8_PTR_PREFIX "d\n", name, value);
   msg.WriteToLogFile();
 }
 #endif
 
 
 void Logger::HandleEvent(const char* name, Object** location) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_handles) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_handles) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,0x%" V8PRIxPTR "\n", name, location);
   msg.WriteToLogFile();
 #endif
 }
 
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 // ApiEvent is private so all the calls come from the Logger class.  It is the
 // caller's responsibility to ensure that log is enabled and that
 // FLAG_log_api is true.
 void Logger::ApiEvent(const char* format, ...) {
-  ASSERT(Log::IsEnabled() && FLAG_log_api);
-  LogMessageBuilder msg;
+  ASSERT(log_->IsEnabled() && FLAG_log_api);
+  LogMessageBuilder msg(this);
   va_list ap;
   va_start(ap, format);
   msg.AppendVA(format, ap);
   va_end(ap);
   msg.WriteToLogFile();
 }
 #endif
 
 
 void Logger::ApiNamedSecurityCheck(Object* key) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_api) return;
+  if (!log_->IsEnabled() || !FLAG_log_api) return;
   if (key->IsString()) {
     SmartPointer<char> str =
         String::cast(key)->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
     ApiEvent("api,check-security,\"%s\"\n", *str);
   } else if (key->IsUndefined()) {
     ApiEvent("api,check-security,undefined\n");
   } else {
     ApiEvent("api,check-security,['no-name']\n");
   }
 #endif
 }
 
 
 void Logger::SharedLibraryEvent(const char* library_path,
                                 uintptr_t start,
                                 uintptr_t end) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_prof) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_prof) return;
+  LogMessageBuilder msg(this);
   msg.Append("shared-library,\"%s\",0x%08" V8PRIxPTR ",0x%08" V8PRIxPTR "\n",
              library_path,
              start,
              end);
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::SharedLibraryEvent(const wchar_t* library_path,
                                 uintptr_t start,
                                 uintptr_t end) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_prof) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_prof) return;
+  LogMessageBuilder msg(this);
   msg.Append("shared-library,\"%ls\",0x%08" V8PRIxPTR ",0x%08" V8PRIxPTR "\n",
              library_path,
              start,
              end);
   msg.WriteToLogFile();
 #endif
 }
 
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 void Logger::LogRegExpSource(Handle<JSRegExp> regexp) {
   // Prints "/" + re.source + "/" +
   //      (re.global?"g":"") + (re.ignorecase?"i":"") + (re.multiline?"m":"")
-  LogMessageBuilder msg;
+  LogMessageBuilder msg(this);
 
   Handle<Object> source = GetProperty(regexp, "source");
   if (!source->IsString()) {
     msg.Append("no source");
     return;
   }
 
   switch (regexp->TypeTag()) {
     case JSRegExp::ATOM:
       msg.Append('a');
@@ skipping 21 matching lines @@
     msg.Append('m');
   }
 
   msg.WriteToLogFile();
 }
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 
 void Logger::RegExpCompileEvent(Handle<JSRegExp> regexp, bool in_cache) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_regexp) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_regexp) return;
+  LogMessageBuilder msg(this);
   msg.Append("regexp-compile,");
   LogRegExpSource(regexp);
   msg.Append(in_cache ? ",hit\n" : ",miss\n");
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::LogRuntime(Vector<const char> format, JSArray* args) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_runtime) return;
+  if (!log_->IsEnabled() || !FLAG_log_runtime) return;
   HandleScope scope;
-  LogMessageBuilder msg;
+  LogMessageBuilder msg(this);
   for (int i = 0; i < format.length(); i++) {
     char c = format[i];
     if (c == '%' && i <= format.length() - 2) {
       i++;
       ASSERT('0' <= format[i] && format[i] <= '9');
       MaybeObject* maybe = args->GetElement(format[i] - '0');
       Object* obj;
       if (!maybe->ToObject(&obj)) {
         msg.Append("<exception>");
         continue;
@@ skipping 23 matching lines @@
     }
   }
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::ApiIndexedSecurityCheck(uint32_t index) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_api) return;
+  if (!log_->IsEnabled() || !FLAG_log_api) return;
   ApiEvent("api,check-security,%u\n", index);
 #endif
 }
 
 
 void Logger::ApiNamedPropertyAccess(const char* tag,
                                     JSObject* holder,
                                     Object* name) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   ASSERT(name->IsString());
-  if (!Log::IsEnabled() || !FLAG_log_api) return;
+  if (!log_->IsEnabled() || !FLAG_log_api) return;
   String* class_name_obj = holder->class_name();
   SmartPointer<char> class_name =
       class_name_obj->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
   SmartPointer<char> property_name =
       String::cast(name)->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
-  Logger::ApiEvent("api,%s,\"%s\",\"%s\"\n", tag, *class_name, *property_name);
+  LOGGER->ApiEvent("api,%s,\"%s\",\"%s\"\n", tag, *class_name, *property_name);
 #endif
 }
 
 void Logger::ApiIndexedPropertyAccess(const char* tag,
                                       JSObject* holder,
                                       uint32_t index) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_api) return;
+  if (!log_->IsEnabled() || !FLAG_log_api) return;
   String* class_name_obj = holder->class_name();
   SmartPointer<char> class_name =
       class_name_obj->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
-  Logger::ApiEvent("api,%s,\"%s\",%u\n", tag, *class_name, index);
+  LOGGER->ApiEvent("api,%s,\"%s\",%u\n", tag, *class_name, index);
 #endif
 }
 
 void Logger::ApiObjectAccess(const char* tag, JSObject* object) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_api) return;
+  if (!log_->IsEnabled() || !FLAG_log_api) return;
   String* class_name_obj = object->class_name();
   SmartPointer<char> class_name =
       class_name_obj->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
-  Logger::ApiEvent("api,%s,\"%s\"\n", tag, *class_name);
+  LOGGER->ApiEvent("api,%s,\"%s\"\n", tag, *class_name);
 #endif
 }
 
 
 void Logger::ApiEntryCall(const char* name) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_api) return;
-  Logger::ApiEvent("api,%s\n", name);
+  if (!log_->IsEnabled() || !FLAG_log_api) return;
+  LOGGER->ApiEvent("api,%s\n", name);
 #endif
 }
 
 
 void Logger::NewEvent(const char* name, void* object, size_t size) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log) return;
+  LogMessageBuilder msg(this);
   msg.Append("new,%s,0x%" V8PRIxPTR ",%u\n", name, object,
              static_cast<unsigned int>(size));
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::DeleteEvent(const char* name, void* object) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log) return;
+  LogMessageBuilder msg(this);
   msg.Append("delete,%s,0x%" V8PRIxPTR "\n", name, object);
   msg.WriteToLogFile();
 #endif
 }
 
 
+void Logger::NewEventStatic(const char* name, void* object, size_t size) {
+  LOGGER->NewEvent(name, object, size);
+}
+
+
+void Logger::DeleteEventStatic(const char* name, void* object) {
+  LOGGER->DeleteEvent(name, object);
+}
+
 #ifdef ENABLE_LOGGING_AND_PROFILING
 void Logger::CallbackEventInternal(const char* prefix, const char* name,
                                    Address entry_point) {
-  if (!Log::IsEnabled() || !FLAG_log_code) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_code) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,%s,",
              kLogEventsNames[CODE_CREATION_EVENT],
              kLogEventsNames[CALLBACK_TAG]);
   msg.AppendAddress(entry_point);
   msg.Append(",1,\"%s%s\"", prefix, name);
   msg.Append('\n');
   msg.WriteToLogFile();
 }
 #endif
 
 
 void Logger::CallbackEvent(String* name, Address entry_point) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_code) return;
+  if (!log_->IsEnabled() || !FLAG_log_code) return;
   SmartPointer<char> str =
       name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
   CallbackEventInternal("", *str, entry_point);
 #endif
 }
 
 
 void Logger::GetterCallbackEvent(String* name, Address entry_point) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_code) return;
+  if (!log_->IsEnabled() || !FLAG_log_code) return;
   SmartPointer<char> str =
       name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
   CallbackEventInternal("get ", *str, entry_point);
 #endif
 }
 
 
 void Logger::SetterCallbackEvent(String* name, Address entry_point) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_code) return;
+  if (!log_->IsEnabled() || !FLAG_log_code) return;
   SmartPointer<char> str =
       name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
   CallbackEventInternal("set ", *str, entry_point);
 #endif
 }
 
 
 void Logger::CodeCreateEvent(LogEventsAndTags tag,
                              Code* code,
                              const char* comment) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_code) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_code) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,%s,",
              kLogEventsNames[CODE_CREATION_EVENT],
              kLogEventsNames[tag]);
   msg.AppendAddress(code->address());
   msg.Append(",%d,\"", code->ExecutableSize());
   for (const char* p = comment; *p != '\0'; p++) {
     if (*p == '"') {
       msg.Append('\\');
     }
     msg.Append(*p);
@@ skipping 31 matching lines @@
   }
 }
 #endif
 
 
 void Logger::CodeCreateEvent(LogEventsAndTags tag,
                              Code* code,
                              SharedFunctionInfo* shared,
                              String* name) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_code) return;
-  if (code == Builtins::builtin(Builtins::LazyCompile)) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_code) return;
+  if (code == Isolate::Current()->builtins()->builtin(
+      Builtins::LazyCompile))
+    return;
+
+  LogMessageBuilder msg(this);
   SmartPointer<char> str =
       name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
   msg.Append("%s,%s,",
              kLogEventsNames[CODE_CREATION_EVENT],
              kLogEventsNames[tag]);
   msg.AppendAddress(code->address());
   msg.Append(",%d,\"%s\",", code->ExecutableSize(), *str);
   msg.AppendAddress(shared->address());
   msg.Append(",%s", ComputeMarker(code));
   LowLevelCodeCreateEvent(code, &msg);
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
 }
 
 
 // Although, it is possible to extract source and line from
 // the SharedFunctionInfo object, we left it to caller
 // to leave logging functions free from heap allocations.
 void Logger::CodeCreateEvent(LogEventsAndTags tag,
                              Code* code,
                              SharedFunctionInfo* shared,
                              String* source, int line) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_code) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_code) return;
+  LogMessageBuilder msg(this);
   SmartPointer<char> name =
       shared->DebugName()->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
   SmartPointer<char> sourcestr =
       source->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
   msg.Append("%s,%s,",
              kLogEventsNames[CODE_CREATION_EVENT],
              kLogEventsNames[tag]);
   msg.AppendAddress(code->address());
   msg.Append(",%d,\"%s %s:%d\",",
              code->ExecutableSize(),
              *name,
              *sourcestr,
              line);
   msg.AppendAddress(shared->address());
   msg.Append(",%s", ComputeMarker(code));
   LowLevelCodeCreateEvent(code, &msg);
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::CodeCreateEvent(LogEventsAndTags tag, Code* code, int args_count) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_code) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_code) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,%s,",
              kLogEventsNames[CODE_CREATION_EVENT],
              kLogEventsNames[tag]);
   msg.AppendAddress(code->address());
   msg.Append(",%d,\"args_count: %d\"", code->ExecutableSize(), args_count);
   LowLevelCodeCreateEvent(code, &msg);
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::CodeMovingGCEvent() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_code || !FLAG_ll_prof) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_code || !FLAG_ll_prof) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s\n", kLogEventsNames[CODE_MOVING_GC]);
   msg.WriteToLogFile();
   OS::SignalCodeMovingGC();
 #endif
 }
 
 
 void Logger::RegExpCodeCreateEvent(Code* code, String* source) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_code) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_code) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,%s,",
              kLogEventsNames[CODE_CREATION_EVENT],
              kLogEventsNames[REG_EXP_TAG]);
   msg.AppendAddress(code->address());
   msg.Append(",%d,\"", code->ExecutableSize());
   msg.AppendDetailed(source, false);
   msg.Append('\"');
   LowLevelCodeCreateEvent(code, &msg);
   msg.Append('\n');
   msg.WriteToLogFile();
@@ skipping 10 matching lines @@
 
 void Logger::CodeDeleteEvent(Address from) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   DeleteEventInternal(CODE_DELETE_EVENT, from);
 #endif
 }
 
 
 void Logger::SnapshotPositionEvent(Address addr, int pos) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_snapshot_positions) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_snapshot_positions) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,", kLogEventsNames[SNAPSHOT_POSITION_EVENT]);
   msg.AppendAddress(addr);
   msg.Append(",%d", pos);
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::SharedFunctionInfoMoveEvent(Address from, Address to) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   MoveEventInternal(SHARED_FUNC_MOVE_EVENT, from, to);
 #endif
 }
 
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 void Logger::MoveEventInternal(LogEventsAndTags event,
                                Address from,
                                Address to) {
-  if (!Log::IsEnabled() || !FLAG_log_code) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_code) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,", kLogEventsNames[event]);
   msg.AppendAddress(from);
   msg.Append(',');
   msg.AppendAddress(to);
   msg.Append('\n');
   msg.WriteToLogFile();
 }
 #endif
 
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 void Logger::DeleteEventInternal(LogEventsAndTags event, Address from) {
-  if (!Log::IsEnabled() || !FLAG_log_code) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_code) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,", kLogEventsNames[event]);
   msg.AppendAddress(from);
   msg.Append('\n');
   msg.WriteToLogFile();
 }
 #endif
 
 
 void Logger::ResourceEvent(const char* name, const char* tag) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,%s,", name, tag);
 
   uint32_t sec, usec;
   if (OS::GetUserTime(&sec, &usec) != -1) {
     msg.Append("%d,%d,", sec, usec);
   }
   msg.Append("%.0f", OS::TimeCurrentMillis());
 
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::SuspectReadEvent(String* name, Object* obj) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_suspect) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_suspect) return;
+  LogMessageBuilder msg(this);
   String* class_name = obj->IsJSObject()
                        ? JSObject::cast(obj)->class_name()
-                       : Heap::empty_string();
+                       : HEAP->empty_string();
   msg.Append("suspect-read,");
   msg.Append(class_name);
   msg.Append(',');
   msg.Append('"');
   msg.Append(name);
   msg.Append('"');
   msg.Append('\n');
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::HeapSampleBeginEvent(const char* space, const char* kind) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_gc) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_gc) return;
+  LogMessageBuilder msg(this);
   // Using non-relative system time in order to be able to synchronize with
   // external memory profiling events (e.g. DOM memory size).
   msg.Append("heap-sample-begin,\"%s\",\"%s\",%.0f\n",
              space, kind, OS::TimeCurrentMillis());
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::HeapSampleStats(const char* space, const char* kind,
                              intptr_t capacity, intptr_t used) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_gc) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_gc) return;
+  LogMessageBuilder msg(this);
   msg.Append("heap-sample-stats,\"%s\",\"%s\","
                  "%" V8_PTR_PREFIX "d,%" V8_PTR_PREFIX "d\n",
              space, kind, capacity, used);
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::HeapSampleEndEvent(const char* space, const char* kind) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_gc) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_gc) return;
+  LogMessageBuilder msg(this);
   msg.Append("heap-sample-end,\"%s\",\"%s\"\n", space, kind);
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::HeapSampleItemEvent(const char* type, int number, int bytes) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_gc) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_gc) return;
+  LogMessageBuilder msg(this);
   msg.Append("heap-sample-item,%s,%d,%d\n", type, number, bytes);
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::HeapSampleJSConstructorEvent(const char* constructor,
                                           int number, int bytes) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_gc) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_gc) return;
+  LogMessageBuilder msg(this);
   msg.Append("heap-js-cons-item,%s,%d,%d\n", constructor, number, bytes);
   msg.WriteToLogFile();
 #endif
 }
 
+// Event starts with comma, so we don't have it in the format string.
+static const char kEventText[] = "heap-js-ret-item,%s";
+// We take placeholder strings into account, but it's OK to be conservative.
+static const int kEventTextLen = sizeof(kEventText)/sizeof(kEventText[0]);
 
 void Logger::HeapSampleJSRetainersEvent(
     const char* constructor, const char* event) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_gc) return;
-  // Event starts with comma, so we don't have it in the format string.
-  static const char* event_text = "heap-js-ret-item,%s";
-  // We take placeholder strings into account, but it's OK to be conservative.
-  static const int event_text_len = StrLength(event_text);
+  if (!log_->IsEnabled() || !FLAG_log_gc) return;
   const int cons_len = StrLength(constructor);
   const int event_len = StrLength(event);
   int pos = 0;
   // Retainer lists can be long. We may need to split them into multiple events.
   do {
-    LogMessageBuilder msg;
-    msg.Append(event_text, constructor);
+    LogMessageBuilder msg(this);
+    msg.Append(kEventText, constructor);
     int to_write = event_len - pos;
-    if (to_write > Log::kMessageBufferSize - (cons_len + event_text_len)) {
-      int cut_pos = pos + Log::kMessageBufferSize - (cons_len + event_text_len);
+    if (to_write > Log::kMessageBufferSize - (cons_len + kEventTextLen)) {
+      int cut_pos = pos + Log::kMessageBufferSize - (cons_len + kEventTextLen);
       ASSERT(cut_pos < event_len);
       while (cut_pos > pos && event[cut_pos] != ',') --cut_pos;
       if (event[cut_pos] != ',') {
         // Crash in debug mode, skip in release mode.
         ASSERT(false);
         return;
       }
       // Append a piece of event that fits, without trailing comma.
       msg.AppendStringPart(event + pos, cut_pos - pos);
       // Start next piece with comma.
       pos = cut_pos;
     } else {
       msg.Append("%s", event + pos);
       pos += event_len;
     }
     msg.Append('\n');
     msg.WriteToLogFile();
   } while (pos < event_len);
 #endif
 }
 
 
 void Logger::HeapSampleJSProducerEvent(const char* constructor,
                                        Address* stack) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_gc) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log_gc) return;
+  LogMessageBuilder msg(this);
   msg.Append("heap-js-prod-item,%s", constructor);
   while (*stack != NULL) {
     msg.Append(",0x%" V8PRIxPTR, *stack++);
   }
   msg.Append("\n");
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::DebugTag(const char* call_site_tag) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_log) return;
+  LogMessageBuilder msg(this);
   msg.Append("debug-tag,%s\n", call_site_tag);
   msg.WriteToLogFile();
 #endif
 }
 
 
 void Logger::DebugEvent(const char* event_type, Vector<uint16_t> parameter) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log) return;
+  if (!log_->IsEnabled() || !FLAG_log) return;
   StringBuilder s(parameter.length() + 1);
   for (int i = 0; i < parameter.length(); ++i) {
     s.AddCharacter(static_cast<char>(parameter[i]));
   }
   char* parameter_string = s.Finalize();
-  LogMessageBuilder msg;
+  LogMessageBuilder msg(this);
   msg.Append("debug-queue-event,%s,%15.3f,%s\n",
              event_type,
              OS::TimeCurrentMillis(),
              parameter_string);
   DeleteArray(parameter_string);
   msg.WriteToLogFile();
 #endif
 }
 
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 void Logger::TickEvent(TickSample* sample, bool overflow) {
-  if (!Log::IsEnabled() || !FLAG_prof) return;
-  LogMessageBuilder msg;
+  if (!log_->IsEnabled() || !FLAG_prof) return;
+  LogMessageBuilder msg(this);
   msg.Append("%s,", kLogEventsNames[TICK_EVENT]);
   msg.AppendAddress(sample->pc);
   msg.Append(',');
   msg.AppendAddress(sample->sp);
   msg.Append(',');
   msg.AppendAddress(sample->tos);
   msg.Append(",%d", static_cast<int>(sample->state));
   if (overflow) {
     msg.Append(",overflow");
   }
@@ skipping 12 matching lines @@
     result |= PROFILER_MODULE_CPU;
   }
   if (FLAG_log_gc) {
     result |= PROFILER_MODULE_HEAP_STATS | PROFILER_MODULE_JS_CONSTRUCTORS;
   }
   return result;
 }
 
 
 void Logger::PauseProfiler(int flags, int tag) {
-  if (!Log::IsEnabled()) return;
+  if (!log_->IsEnabled()) return;
   if (profiler_ != NULL && (flags & PROFILER_MODULE_CPU)) {
     // It is OK to have negative nesting.
     if (--cpu_profiler_nesting_ == 0) {
       profiler_->pause();
       if (FLAG_prof_lazy) {
         if (!FLAG_sliding_state_window && !RuntimeProfiler::IsEnabled()) {
           ticker_->Stop();
         }
         FLAG_log_code = false;
         // Must be the same message as Log::kDynamicBufferSeal.
-        LOG(UncheckedStringEvent("profiler", "pause"));
+        LOG(ISOLATE, UncheckedStringEvent("profiler", "pause"));
       }
       --logging_nesting_;
     }
   }
   if (flags &
       (PROFILER_MODULE_HEAP_STATS | PROFILER_MODULE_JS_CONSTRUCTORS)) {
     if (--heap_profiler_nesting_ == 0) {
       FLAG_log_gc = false;
       --logging_nesting_;
     }
   }
   if (tag != 0) {
     UncheckedIntEvent("close-tag", tag);
   }
 }
 
 
 void Logger::ResumeProfiler(int flags, int tag) {
-  if (!Log::IsEnabled()) return;
+  if (!log_->IsEnabled()) return;
   if (tag != 0) {
     UncheckedIntEvent("open-tag", tag);
   }
   if (profiler_ != NULL && (flags & PROFILER_MODULE_CPU)) {
     if (cpu_profiler_nesting_++ == 0) {
       ++logging_nesting_;
       if (FLAG_prof_lazy) {
         profiler_->Engage();
-        LOG(UncheckedStringEvent("profiler", "resume"));
+        LOG(ISOLATE, UncheckedStringEvent("profiler", "resume"));
         FLAG_log_code = true;
         LogCompiledFunctions();
         LogAccessorCallbacks();
         if (!FLAG_sliding_state_window && !ticker_->IsActive()) {
           ticker_->Start();
         }
       }
       profiler_->resume();
     }
   }
   if (flags &
       (PROFILER_MODULE_HEAP_STATS | PROFILER_MODULE_JS_CONSTRUCTORS)) {
     if (heap_profiler_nesting_++ == 0) {
       ++logging_nesting_;
       FLAG_log_gc = true;
     }
   }
 }
 
 
 // This function can be called when Log's mutex is acquired,
 // either from main or Profiler's thread.
-void Logger::StopLoggingAndProfiling() {
-  Log::stop();
+void Logger::LogFailure() {
   PauseProfiler(PROFILER_MODULE_CPU, 0);
 }
 
 
 bool Logger::IsProfilerSamplerActive() {
   return ticker_->IsActive();
 }
 
 
 int Logger::GetLogLines(int from_pos, char* dest_buf, int max_size) {
-  return Log::GetLogLines(from_pos, dest_buf, max_size);
+  return log_->GetLogLines(from_pos, dest_buf, max_size);
 }
 
 
 class EnumerateOptimizedFunctionsVisitor: public OptimizedFunctionVisitor {
  public:
   EnumerateOptimizedFunctionsVisitor(Handle<SharedFunctionInfo>* sfis,
                                      Handle<Code>* code_objects,
                                      int* count)
       : sfis_(sfis), code_objects_(code_objects), count_(count) { }
 
@@ skipping 101 matching lines @@
         break;
       case Code::CALL_IC:
         description = "A call IC from the snapshot";
         tag = Logger::CALL_IC_TAG;
         break;
       case Code::KEYED_CALL_IC:
         description = "A keyed call IC from the snapshot";
         tag = Logger::KEYED_CALL_IC_TAG;
         break;
     }
-    PROFILE(CodeCreateEvent(tag, code_object, description));
+    PROFILE(ISOLATE, CodeCreateEvent(tag, code_object, description));
   }
 }
 
 
 void Logger::LogCodeInfo() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  if (!Log::IsEnabled() || !FLAG_log_code || !FLAG_ll_prof) return;
+  if (!log_->IsEnabled() || !FLAG_log_code || !FLAG_ll_prof) return;
 #if V8_TARGET_ARCH_IA32
   const char arch[] = "ia32";
 #elif V8_TARGET_ARCH_X64
   const char arch[] = "x64";
 #elif V8_TARGET_ARCH_ARM
   const char arch[] = "arm";
 #else
   const char arch[] = "unknown";
 #endif
-  LogMessageBuilder msg;
+  LogMessageBuilder msg(this);
   msg.Append("code-info,%s,%d\n", arch, Code::kHeaderSize);
   msg.WriteToLogFile();
 #endif  // ENABLE_LOGGING_AND_PROFILING
 }
 
 
 void Logger::LowLevelCodeCreateEvent(Code* code, LogMessageBuilder* msg) {
-  if (!FLAG_ll_prof || Log::output_code_handle_ == NULL) return;
-  int pos = static_cast<int>(ftell(Log::output_code_handle_));
+  if (!FLAG_ll_prof || log_->output_code_handle_ == NULL) return;
+  int pos = static_cast<int>(ftell(log_->output_code_handle_));
   size_t rv = fwrite(code->instruction_start(), 1, code->instruction_size(),
-                     Log::output_code_handle_);
+                     log_->output_code_handle_);
   ASSERT(static_cast<size_t>(code->instruction_size()) == rv);
   USE(rv);
   msg->Append(",%d", pos);
 }
 
 
 void Logger::LogCodeObjects() {
   AssertNoAllocation no_alloc;
   HeapIterator iterator;
   for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
     if (obj->IsCode()) LogCodeObject(obj);
   }
 }
 
 
 void Logger::LogCompiledFunctions() {
   HandleScope scope;
   const int compiled_funcs_count = EnumerateCompiledFunctions(NULL, NULL);
   ScopedVector< Handle<SharedFunctionInfo> > sfis(compiled_funcs_count);
   ScopedVector< Handle<Code> > code_objects(compiled_funcs_count);
   EnumerateCompiledFunctions(sfis.start(), code_objects.start());
 
   // During iteration, there can be heap allocation due to
   // GetScriptLineNumber call.
   for (int i = 0; i < compiled_funcs_count; ++i) {
-    if (*code_objects[i] == Builtins::builtin(Builtins::LazyCompile)) continue;
+    if (*code_objects[i] == Isolate::Current()->builtins()->builtin(
+        Builtins::LazyCompile))
+      continue;
     Handle<SharedFunctionInfo> shared = sfis[i];
     Handle<String> func_name(shared->DebugName());
     if (shared->script()->IsScript()) {
       Handle<Script> script(Script::cast(shared->script()));
       if (script->name()->IsString()) {
         Handle<String> script_name(String::cast(script->name()));
         int line_num = GetScriptLineNumber(script, shared->start_position());
         if (line_num > 0) {
-          PROFILE(CodeCreateEvent(
-              Logger::ToNativeByScript(Logger::LAZY_COMPILE_TAG, *script),
-              *code_objects[i], *shared,
-              *script_name, line_num + 1));
+          PROFILE(ISOLATE,
+                  CodeCreateEvent(
+                    Logger::ToNativeByScript(Logger::LAZY_COMPILE_TAG, *script),
+                    *code_objects[i], *shared,
+                    *script_name, line_num + 1));
         } else {
           // Can't distinguish eval and script here, so always use Script.
-          PROFILE(CodeCreateEvent(
-              Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script),
-              *code_objects[i], *shared, *script_name));
+          PROFILE(ISOLATE,
+                  CodeCreateEvent(
+                      Logger::ToNativeByScript(Logger::SCRIPT_TAG, *script),
+                      *code_objects[i], *shared, *script_name));
         }
       } else {
-        PROFILE(CodeCreateEvent(
-            Logger::ToNativeByScript(Logger::LAZY_COMPILE_TAG, *script),
-            *code_objects[i], *shared, *func_name));
+        PROFILE(ISOLATE,
+                CodeCreateEvent(
+                    Logger::ToNativeByScript(Logger::LAZY_COMPILE_TAG, *script),
+                    *code_objects[i], *shared, *func_name));
       }
     } else if (shared->IsApiFunction()) {
       // API function.
       FunctionTemplateInfo* fun_data = shared->get_api_func_data();
       Object* raw_call_data = fun_data->call_code();
       if (!raw_call_data->IsUndefined()) {
         CallHandlerInfo* call_data = CallHandlerInfo::cast(raw_call_data);
         Object* callback_obj = call_data->callback();
         Address entry_point = v8::ToCData<Address>(callback_obj);
-        PROFILE(CallbackEvent(*func_name, entry_point));
+        PROFILE(ISOLATE, CallbackEvent(*func_name, entry_point));
       }
     } else {
-      PROFILE(CodeCreateEvent(
-          Logger::LAZY_COMPILE_TAG, *code_objects[i], *shared, *func_name));
+      PROFILE(ISOLATE,
+              CodeCreateEvent(
+                  Logger::LAZY_COMPILE_TAG, *code_objects[i],
+                  *shared, *func_name));
     }
   }
 }
 
 
 void Logger::LogAccessorCallbacks() {
   AssertNoAllocation no_alloc;
   HeapIterator iterator;
+  i::Isolate* isolate = ISOLATE;
   for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
     if (!obj->IsAccessorInfo()) continue;
     AccessorInfo* ai = AccessorInfo::cast(obj);
     if (!ai->name()->IsString()) continue;
     String* name = String::cast(ai->name());
     Address getter_entry = v8::ToCData<Address>(ai->getter());
     if (getter_entry != 0) {
-      PROFILE(GetterCallbackEvent(name, getter_entry));
+      PROFILE(isolate, GetterCallbackEvent(name, getter_entry));
     }
     Address setter_entry = v8::ToCData<Address>(ai->setter());
     if (setter_entry != 0) {
-      PROFILE(SetterCallbackEvent(name, setter_entry));
+      PROFILE(isolate, SetterCallbackEvent(name, setter_entry));
     }
   }
 }
 
 #endif
 
 
 bool Logger::Setup() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  // --log-all enables all the log flags.
-  if (FLAG_log_all) {
-    FLAG_log_runtime = true;
-    FLAG_log_api = true;
-    FLAG_log_code = true;
-    FLAG_log_gc = true;
-    FLAG_log_suspect = true;
-    FLAG_log_handles = true;
-    FLAG_log_regexp = true;
-  }
-
-  // --prof implies --log-code.
-  if (FLAG_prof) FLAG_log_code = true;
+  // Tests and EnsureInitialize() can call this twice in a row. It's harmless.
+  if (is_initialized_) return true;
+  is_initialized_ = true;
 
   // --ll-prof implies --log-code and --log-snapshot-positions.
   if (FLAG_ll_prof) {
     FLAG_log_code = true;
     FLAG_log_snapshot_positions = true;
   }
 
   // --prof_lazy controls --log-code, implies --noprof_auto.
   if (FLAG_prof_lazy) {
     FLAG_log_code = false;
     FLAG_prof_auto = false;
   }
 
-  bool start_logging = FLAG_log || FLAG_log_runtime || FLAG_log_api
-      || FLAG_log_code || FLAG_log_gc || FLAG_log_handles || FLAG_log_suspect
-      || FLAG_log_regexp || FLAG_log_state_changes;
+  // TODO(isolates): this assert introduces cyclic dependency (logger
+  // -> thread local top -> heap -> logger).
+  // ASSERT(VMState::is_outermost_external());
 
-  bool open_log_file = start_logging || FLAG_prof_lazy;
-
-  // If we're logging anything, we need to open the log file.
-  if (open_log_file) {
-    if (strcmp(FLAG_logfile, "-") == 0) {
-      Log::OpenStdout();
-    } else if (strcmp(FLAG_logfile, "*") == 0) {
-      Log::OpenMemoryBuffer();
-    } else if (strchr(FLAG_logfile, '%') != NULL) {
-      // If there's a '%' in the log file name we have to expand
-      // placeholders.
-      HeapStringAllocator allocator;
-      StringStream stream(&allocator);
-      for (const char* p = FLAG_logfile; *p; p++) {
-        if (*p == '%') {
-          p++;
-          switch (*p) {
-            case '\0':
-              // If there's a % at the end of the string we back up
-              // one character so we can escape the loop properly.
-              p--;
-              break;
-            case 't': {
-              // %t expands to the current time in milliseconds.
-              double time = OS::TimeCurrentMillis();
-              stream.Add("%.0f", FmtElm(time));
-              break;
-            }
-            case '%':
-              // %% expands (contracts really) to %.
-              stream.Put('%');
-              break;
-            default:
-              // All other %'s expand to themselves.
-              stream.Put('%');
-              stream.Put(*p);
-              break;
-          }
-        } else {
-          stream.Put(*p);
-        }
-      }
-      SmartPointer<const char> expanded = stream.ToCString();
-      Log::OpenFile(*expanded);
-    } else {
-      Log::OpenFile(FLAG_logfile);
-    }
-  }
+  log_->Initialize();
 
   if (FLAG_ll_prof) LogCodeInfo();
 
-  ticker_ = new Ticker(kSamplingIntervalMs);
+  ticker_ = new Ticker(Isolate::Current(), kSamplingIntervalMs);
 
   if (FLAG_sliding_state_window && sliding_state_window_ == NULL) {
     sliding_state_window_ = new SlidingStateWindow();
   }
 
+  bool start_logging = FLAG_log || FLAG_log_runtime || FLAG_log_api
+    || FLAG_log_code || FLAG_log_gc || FLAG_log_handles || FLAG_log_suspect
+    || FLAG_log_regexp || FLAG_log_state_changes;
+
   if (start_logging) {
     logging_nesting_ = 1;
   }
 
   if (FLAG_prof) {
-    profiler_ = new Profiler();
+    profiler_ = new Profiler(Isolate::Current());
     if (!FLAG_prof_auto) {
       profiler_->pause();
     } else {
       logging_nesting_ = 1;
     }
     if (!FLAG_prof_lazy) {
       profiler_->Engage();
     }
   }
 
-  LogMessageBuilder::set_write_failure_handler(StopLoggingAndProfiling);
   return true;
 
 #else
   return false;
 #endif
 }
 
 
+Sampler* Logger::sampler() {
+  return ticker_;
+}
+
+
 void Logger::EnsureTickerStarted() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   ASSERT(ticker_ != NULL);
   if (!ticker_->IsActive()) ticker_->Start();
 #endif
 }
 
 
 void Logger::EnsureTickerStopped() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (ticker_ != NULL && ticker_->IsActive()) ticker_->Stop();
 #endif
 }
 
 
 void Logger::TearDown() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
-  LogMessageBuilder::set_write_failure_handler(NULL);
+  if (!is_initialized_) return;
+  is_initialized_ = false;
 
   // Stop the profiler before closing the file.
   if (profiler_ != NULL) {
     profiler_->Disengage();
     delete profiler_;
     profiler_ = NULL;
   }
 
   delete sliding_state_window_;
   sliding_state_window_ = NULL;
 
   delete ticker_;
   ticker_ = NULL;
 
-  Log::Close();
+  log_->Close();
 #endif
 }
 
 
 void Logger::EnableSlidingStateWindow() {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   // If the ticker is NULL, Logger::Setup has not been called yet.  In
   // that case, we set the sliding_state_window flag so that the
   // sliding window computation will be started when Logger::Setup is
   // called.
   if (ticker_ == NULL) {
     FLAG_sliding_state_window = true;
     return;
   }
   // Otherwise, if the sliding state window computation has not been
   // started we do it now.
   if (sliding_state_window_ == NULL) {
     sliding_state_window_ = new SlidingStateWindow();
   }
 #endif
 }
 
+
+Mutex* SamplerRegistry::mutex_ = OS::CreateMutex();
+List<Sampler*>* SamplerRegistry::active_samplers_ = NULL;
+
+
+bool SamplerRegistry::IterateActiveSamplers(VisitSampler func, void* param) {
+  ScopedLock lock(mutex_);
+  for (int i = 0;
+       ActiveSamplersExist() && i < active_samplers_->length();
+       ++i) {
+    func(active_samplers_->at(i), param);
+  }
+  return ActiveSamplersExist();
+}
+
+
+static void ComputeCpuProfiling(Sampler* sampler, void* flag_ptr) {
+  bool* flag = reinterpret_cast<bool*>(flag_ptr);
+  *flag |= sampler->IsProfiling();
+}
+
+
+SamplerRegistry::State SamplerRegistry::GetState() {
+  bool flag = false;
+  if (!IterateActiveSamplers(&ComputeCpuProfiling, &flag)) {
+    return HAS_NO_SAMPLERS;
+  }
+  return flag ? HAS_CPU_PROFILING_SAMPLERS : HAS_SAMPLERS;
+}
+
+
+void SamplerRegistry::AddActiveSampler(Sampler* sampler) {
+  ASSERT(sampler->IsActive());
+  ScopedLock lock(mutex_);
+  if (active_samplers_ == NULL) {
+    active_samplers_ = new List<Sampler*>;
+  } else {
+    ASSERT(!active_samplers_->Contains(sampler));
+  }
+  active_samplers_->Add(sampler);
+}
+
+
+void SamplerRegistry::RemoveActiveSampler(Sampler* sampler) {
+  ASSERT(sampler->IsActive());
+  ScopedLock lock(mutex_);
+  ASSERT(active_samplers_ != NULL);
+  bool removed = active_samplers_->RemoveElement(sampler);
+  ASSERT(removed);
+  USE(removed);
+}
+
 } }  // namespace v8::internal