v8:3539 - hold constructor feedback in weak cells

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 177 matching lines @@
   Code::Kind GetKind(FeedbackVectorICSlot slot) const;
 
   template <typename Spec>
   static Handle<TypeFeedbackVector> Allocate(Isolate* isolate,
                                              const Spec* spec);
 
   static Handle<TypeFeedbackVector> Copy(Isolate* isolate,
                                          Handle<TypeFeedbackVector> vector);
 
   // Clears the vector slots and the vector ic slots.
-  void ClearSlots(SharedFunctionInfo* shared);
+  void ClearSlots(SharedFunctionInfo* shared) { ClearSlotsImpl(shared, true); }
+  void ClearSlotsAtGCTime(SharedFunctionInfo* shared) {
+    ClearSlotsImpl(shared, false);
+  }
+
   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);
 
@@ skipping 21 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 ClearSlotsImpl(SharedFunctionInfo* shared, bool force_clear);
   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:
@@ skipping 146 matching lines @@
   void ConfigurePolymorphic(Handle<Name> name, MapHandleList* maps,
                             CodeHandleList* handlers);
 
   InlineCacheState StateFromFeedback() const OVERRIDE;
   Name* FindFirstName() const OVERRIDE;
 };
 }
 }  // namespace v8::internal
 
 #endif  // V8_TRANSITIONS_H_