Allocation site pretenuring.

src/heap.h

 // 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
@@ skipping 2168 matching lines @@
   // Performs a major collection in the whole heap.
   void MarkCompact(GCTracer* tracer);
 
   // Code to be run before and after mark-compact.
   void MarkCompactPrologue();
 
   void ProcessNativeContexts(WeakObjectRetainer* retainer, bool record_slots);
   void ProcessArrayBuffers(WeakObjectRetainer* retainer, bool record_slots);
   void ProcessAllocationSites(WeakObjectRetainer* retainer, bool record_slots);
 
+  // Deopts all dependent code of the currently registered allocation sites and
+  // sets the given pretenuring decisions to undecided.
+  void ClearAllAllocationSitesDependentCode();
+
+  // Evaluates local pretenuring and calls ClearAllAllocationSitesDependentCode
+  // if too many objects died in the old generation.
+  void EvaluateLocalPretenuring(uint64_t size_of_objects_before_gc);
+
   // Called on heap tear-down.
   void TearDownArrayBuffers();
 
   // Record statistics before and after garbage collection.
   void ReportStatisticsBeforeGC();
   void ReportStatisticsAfterGC();
 
   // Slow part of scavenge object.
   static void ScavengeObjectSlow(HeapObject** p, HeapObject* object);
 
@@ skipping 23 matching lines @@
   void FlushNumberStringCache();
 
   void UpdateSurvivalRateTrend(int start_new_space_size);
 
   enum SurvivalRateTrend { INCREASING, STABLE, DECREASING, FLUCTUATING };
 
   static const int kYoungSurvivalRateHighThreshold = 90;
   static const int kYoungSurvivalRateLowThreshold = 10;
   static const int kYoungSurvivalRateAllowedDeviation = 15;
 
+  static const int kOldSurvivalRateLowThreshold = 20;
+
   int young_survivors_after_last_gc_;
   int high_survival_rate_period_length_;
   int low_survival_rate_period_length_;
   double survival_rate_;
   SurvivalRateTrend previous_survival_rate_trend_;
   SurvivalRateTrend survival_rate_trend_;
 
   void set_survival_rate_trend(SurvivalRateTrend survival_rate_trend) {
     ASSERT(survival_rate_trend != FLUCTUATING);
     previous_survival_rate_trend_ = survival_rate_trend_;
@@ skipping 846 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_