Ignore slots buffer overflow when recording entries of the allocation sites scratchpad.

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 1486 matching lines @@
   void TracePathToGlobal();
 #endif
 
   // Callback function passed to Heap::Iterate etc.  Copies an object if
   // necessary, the object might be promoted to an old space.  The caller must
   // ensure the precondition that the object is (a) a heap object and (b) in
   // the heap's from space.
   static inline void ScavengePointer(HeapObject** p);
   static inline void ScavengeObject(HeapObject** p, HeapObject* object);
 
+  enum ScratchpadSlotMode {
+    IGNORE_SCRATCHPAD_SLOT,
+    RECORD_SCRATCHPAD_SLOT
+  };
+
   // An object may have an AllocationSite associated with it through a trailing
   // AllocationMemento. Its feedback should be updated when objects are found
   // in the heap.
-  static inline void UpdateAllocationSiteFeedback(HeapObject* object);
+  static inline void UpdateAllocationSiteFeedback(
+      HeapObject* object, ScratchpadSlotMode mode);
 
   // Support for partial snapshots.  After calling this we have a linear
   // space to write objects in each space.
   void ReserveSpace(int *sizes, Address* addresses);
 
   //
   // Support for the API.
   //
 
   bool CreateApiObjects();
@@ skipping 784 matching lines @@
   // Allocates a fixed-size allocation sites scratchpad.
   MUST_USE_RESULT MaybeObject* AllocateAllocationSitesScratchpad();
 
   // Sets used allocation sites entries to undefined.
   void FlushAllocationSitesScratchpad();
 
   // Initializes the allocation sites scratchpad with undefined values.
   void InitializeAllocationSitesScratchpad();
 
   // Adds an allocation site to the scratchpad if there is space left.
-  void AddAllocationSiteToScratchpad(AllocationSite* site);
+  void AddAllocationSiteToScratchpad(AllocationSite* site,
+                                     ScratchpadSlotMode mode);
 
   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;
@@ skipping 788 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_