Add global setup for runtime profiler.

src/runtime-profiler.h

 // Copyright 2010 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 26 matching lines @@
 class Isolate;
 class JSFunction;
 class Object;
 class PendingListNode;
 class Semaphore;
 
 class RuntimeProfiler {
  public:
   explicit RuntimeProfiler(Isolate* isolate);
 
-  static bool IsEnabled();
+  static void GlobalSetup();
+
+  static inline bool IsEnabled() {
+    ASSERT(has_been_globally_setup_);
+    return enabled_;
+  }
 
   void OptimizeNow();
   void OptimizeSoon(JSFunction* function);
 
   void NotifyTick();
 
   void Setup();
   void Reset();
   void TearDown();
 
@@ skipping 78 matching lines @@
   SamplerState state_window_[kStateWindowSize];
   int state_window_position_;
   int state_window_ticks_;
   int state_counts_[2];
 
   // Possible state values:
   //   -1            => the profiler thread is waiting on the semaphore
   //   0 or positive => the number of isolates running JavaScript code.
   static Atomic32 state_;
   static Semaphore* semaphore_;
+
+#ifdef DEBUG
+  static bool has_been_globally_setup_;
+#endif
+  static bool enabled_;
 };
 
 
 // Rate limiter intended to be used in the profiler thread.
 class RuntimeProfilerRateLimiter BASE_EMBEDDED {
  public:
   RuntimeProfilerRateLimiter() : non_js_ticks_(0) { }
 
   // Suspends the current thread (which must be the profiler thread)
   // when not executing JavaScript to minimize CPU usage. Returns
@@ skipping 26 matching lines @@
 
 void RuntimeProfiler::IsolateExitedJS(Isolate* isolate) {
   Atomic32 new_state = NoBarrier_AtomicIncrement(&state_, -1);
   ASSERT(new_state >= 0);
   USE(new_state);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_PROFILER_H_