Retry "Use a WeakCell in the CallIC type vector."

src/type-feedback-vector.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TYPE_FEEDBACK_VECTOR_H_
 #define V8_TYPE_FEEDBACK_VECTOR_H_
 
 #include <vector>
 
 #include "src/checks.h"
@@ skipping 148 matching lines @@
   Code::Kind GetKind(FeedbackVectorICSlot slot) const;
 
   static Handle<TypeFeedbackVector> Allocate(Isolate* isolate,
                                              const FeedbackVectorSpec& spec);
 
   static Handle<TypeFeedbackVector> Copy(Isolate* isolate,
                                          Handle<TypeFeedbackVector> vector);
 
   // Clears the vector slots and the vector ic slots.
   void ClearSlots(SharedFunctionInfo* shared);
+  void ClearICSlots(SharedFunctionInfo* shared) {
+    ClearICSlotsImpl(shared, true);
+  }
+  void ClearICSlotsAtGCTime(SharedFunctionInfo* shared) {
+    ClearICSlotsImpl(shared, false);
+  }
 
   // The object that indicates an uninitialized cache.
   static inline Handle<Object> UninitializedSentinel(Isolate* isolate);
 
   // The object that indicates a megamorphic state.
   static inline Handle<Object> MegamorphicSentinel(Isolate* isolate);
 
   // The object that indicates a premonomorphic state.
   static inline Handle<Object> PremonomorphicSentinel(Isolate* isolate);
 
@@ skipping 15 matching lines @@
   };
 
   static const int kVectorICKindBits = 2;
   static VectorICKind FromCodeKind(Code::Kind kind);
   static Code::Kind FromVectorICKind(VectorICKind kind);
   void SetKind(FeedbackVectorICSlot slot, Code::Kind kind);
 
   typedef BitSetComputer<VectorICKind, kVectorICKindBits, kSmiValueSize,
                          uint32_t> VectorICComputer;
 
+  void ClearICSlotsImpl(SharedFunctionInfo* shared, bool force_clear);
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(TypeFeedbackVector);
 };
 
 
 // A FeedbackNexus is the combination of a TypeFeedbackVector and a slot.
 // Derived classes customize the update and retrieval of feedback.
 class FeedbackNexus {
  public:
   FeedbackNexus(Handle<TypeFeedbackVector> vector, FeedbackVectorICSlot slot)
       : vector_handle_(vector), vector_(NULL), slot_(slot) {}
@@ skipping 145 matching lines @@
   int ExtractMaps(MapHandleList* maps) const OVERRIDE;
   MaybeHandle<Code> FindHandlerForMap(Handle<Map> map) const OVERRIDE;
   virtual bool FindHandlers(CodeHandleList* code_list,
                             int length = -1) const OVERRIDE;
   Name* FindFirstName() const OVERRIDE;
 };
 }
 }  // namespace v8::internal
 
 #endif  // V8_TRANSITIONS_H_