[Isolates] Merge crankshaft (r5922 from bleeding_edge).

src/log.h

 // Copyright 2006-2008 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 122 matching lines @@
   V(SCRIPT_TAG,                     "Script",                 "sc")       \
   V(STORE_IC_TAG,                   "StoreIC",                "sic")      \
   V(STUB_TAG,                       "Stub",                   "s")        \
   V(NATIVE_FUNCTION_TAG,            "Function",               "f")        \
   V(NATIVE_LAZY_COMPILE_TAG,        "LazyCompile",            "lc")       \
   V(NATIVE_SCRIPT_TAG,              "Script",                 "sc")
 // Note that 'NATIVE_' cases for functions and scripts are mapped onto
 // original tags when writing to the log.
 
 
+class Sampler;
+
+
 class Logger {
  public:
 #define DECLARE_ENUM(enum_item, ignore1, ignore2) enum_item,
   enum LogEventsAndTags {
     LOG_EVENTS_AND_TAGS_LIST(DECLARE_ENUM)
     NUMBER_OF_LOG_EVENTS
   };
 #undef DECLARE_ENUM
 
   // Acquires resources for logging if the right flags are set.
   bool Setup();
 
+  void EnsureTickerStarted();
+  void EnsureTickerStopped();
+
+  Sampler* sampler();
+
   // Frees resources acquired in Setup.
   void TearDown();
 
   // Enable the computation of a sliding window of states.
   void EnableSlidingStateWindow();
 
   // Emits an event with a string value -> (name, value).
   void StringEvent(const char* name, const char* value);
 
   // Emits an event with an int value -> (name, value).
@@ skipping 235 matching lines @@
   //  Logger::FunctionCreateEvent(...)
   Address prev_code_;
 
   friend class CpuProfiler;
 #else
   bool is_logging() { return false; }
 #endif
 };
 
 
+// Process wide registry of samplers.
+class SamplerRegistry : public AllStatic {
+ public:
+  enum State {
+    HAS_NO_SAMPLERS,
+    HAS_SAMPLERS,
+    HAS_CPU_PROFILING_SAMPLERS
+  };
+
+  typedef void (*VisitSampler)(Sampler*, void*);
+
+  static State GetState();
+
+  // Iterates over all active samplers keeping the internal lock held.
+  // Returns whether there are any active samplers.
+  static bool IterateActiveSamplers(VisitSampler func, void* param);
+
+  // Adds/Removes an active sampler.
+  static void AddActiveSampler(Sampler* sampler);
+  static void RemoveActiveSampler(Sampler* sampler);
+
+ private:
+  static bool ActiveSamplersExist() {
+    return active_samplers_ != NULL && !active_samplers_->is_empty();
+  }
+
+  static Mutex* mutex_;  // Protects the state below.
+  static List<Sampler*>* active_samplers_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(SamplerRegistry);
+};
+
+
 // Class that extracts stack trace, used for profiling.
 class StackTracer : public AllStatic {
  public:
-  static void Trace(TickSample* sample);
+  static void Trace(Isolate* isolate, TickSample* sample);
 };
 
 } }  // namespace v8::internal
 
 
 #endif  // V8_LOG_H_