New approach to Crankshaft decision-making

src/runtime-profiler.h

Index: src/runtime-profiler.h
diff --git a/src/runtime-profiler.h b/src/runtime-profiler.h
index 15c209713e93b42aa34ed24539865092afbe66d4..147e1d36700afa458cab9154289f80af428408cf 100644
--- a/src/runtime-profiler.h
+++ b/src/runtime-profiler.h
@@ -58,8 +58,13 @@ class RuntimeProfiler {
   void Reset();
   void TearDown();
 
-  Object** SamplerWindowAddress();
-  int SamplerWindowSize();
+  void NotifyICChanged() {
+    any_ic_changed_ = true;
+  }
+  void NotifyCodeGenerated(int generated_code_size) {
+    code_generated_ = true;
+    total_code_generated_ += generated_code_size;
+  }
 
   // Rate limiting support.
 
@@ -88,16 +93,10 @@ class RuntimeProfiler {
   // turned off.
   static void StopRuntimeProfilerThreadBeforeShutdown(Thread* thread);
 
-  void UpdateSamplesAfterScavenge();
-  void RemoveDeadSamples();
-  void UpdateSamplesAfterCompact(ObjectVisitor* visitor);
-
  private:
-  static const int kSamplerWindowSize = 16;
-
   static void HandleWakeUp(Isolate* isolate);
 
-  void Optimize(JSFunction* function);
+  void Optimize(JSFunction* function, const char* reason);
 
   void AttemptOnStackReplacement(JSFunction* function);
 
@@ -105,19 +104,11 @@ class RuntimeProfiler {
 
   void ClearSampleBufferNewSpaceEntries();
 
-  int LookupSample(JSFunction* function);
-
-  void AddSample(JSFunction* function, int weight);
-
   Isolate* isolate_;
 
-  int sampler_threshold_;
-  int sampler_threshold_size_factor_;
-  int sampler_ticks_until_threshold_adjustment_;
-
-  Object* sampler_window_[kSamplerWindowSize];
-  int sampler_window_position_;
-  int sampler_window_weight_[kSamplerWindowSize];
+  bool any_ic_changed_;
+  bool code_generated_;
+  int total_code_generated_;
 
   // Possible state values:
   //   -1            => the profiler thread is waiting on the semaphore