[runtime][ic] Constant field tracking support.

src/lookup.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_LOOKUP_H_
 #define V8_LOOKUP_H_
 
 #include "src/factory.h"
 #include "src/globals.h"
 #include "src/isolate.h"
@@ skipping 196 matching lines @@
   void PrepareTransitionToDataProperty(Handle<JSObject> receiver,
                                        Handle<Object> value,
                                        PropertyAttributes attributes,
                                        Object::StoreFromKeyed store_mode);
   bool IsCacheableTransition() {
     DCHECK_EQ(TRANSITION, state_);
     return transition_->IsPropertyCell() ||
            (!transition_map()->is_dictionary_map() &&
             transition_map()->GetBackPointer()->IsMap());
   }
+  bool IsInitializingStoreRequired() {
+    DCHECK(IsFound());
+    return !IsElement() && !is_dictionary_holder() && representation().IsNone();
+  }
   void ApplyTransitionToDataProperty(Handle<JSObject> receiver);
   void ReconfigureDataProperty(Handle<Object> value,
                                PropertyAttributes attributes);
   void Delete();
   void TransitionToAccessorProperty(Handle<Object> getter,
                                     Handle<Object> setter,
                                     PropertyAttributes attributes);
   void TransitionToAccessorPair(Handle<Object> pair,
                                 PropertyAttributes attributes);
   PropertyDetails property_details() const {
     DCHECK(has_property_);
     return property_details_;
   }
   PropertyAttributes property_attributes() const {
     return property_details().attributes();
   }
   bool IsConfigurable() const { return property_details().IsConfigurable(); }
   bool IsReadOnly() const { return property_details().IsReadOnly(); }
   bool IsEnumerable() const { return property_details().IsEnumerable(); }
   Representation representation() const {
     return property_details().representation();
   }
+  PropertyConstness constness() const { return property_details().constness(); }
   FieldIndex GetFieldIndex() const;
   Handle<FieldType> GetFieldType() const;
   int GetFieldDescriptorIndex() const;
   int GetAccessorIndex() const;
   int GetConstantIndex() const;
   Handle<PropertyCell> GetPropertyCell() const;
   Handle<Object> GetAccessors() const;
   inline Handle<InterceptorInfo> GetInterceptor() const {
     DCHECK_EQ(INTERCEPTOR, state_);
     InterceptorInfo* result =
         IsElement() ? GetInterceptor<true>(JSObject::cast(*holder_))
                     : GetInterceptor<false>(JSObject::cast(*holder_));
     return handle(result, isolate_);
   }
   Handle<InterceptorInfo> GetInterceptorForFailedAccessCheck() const;
   Handle<Object> GetDataValue() const;
-  void WriteDataValue(Handle<Object> value);
+  void WriteDataValue(Handle<Object> value, bool initializing_store);
   inline void UpdateProtector() {
     if (IsElement()) return;
     if (*name_ == heap()->is_concat_spreadable_symbol() ||
         *name_ == heap()->constructor_string() ||
         *name_ == heap()->species_symbol() ||
         *name_ == heap()->has_instance_symbol() ||
         *name_ == heap()->iterator_symbol()) {
       InternalUpdateProtector();
     }
   }
@@ skipping 30 matching lines @@
   State LookupInRegularHolder(Map* map, JSReceiver* holder);
   template <bool is_element>
   State LookupInSpecialHolder(Map* map, JSReceiver* holder);
   template <bool is_element>
   void RestartLookupForNonMaskingInterceptors() {
     RestartInternal<is_element>(InterceptorState::kProcessNonMasking);
   }
   template <bool is_element>
   void RestartInternal(InterceptorState interceptor_state);
   Handle<Object> FetchValue() const;
+  bool IsConstFieldValueEqualTo(Object* value) const;
   template <bool is_element>
   void ReloadPropertyInformation();
 
   template <bool is_element>
   bool SkipInterceptor(JSObject* holder);
   template <bool is_element>
   inline InterceptorInfo* GetInterceptor(JSObject* holder) const {
     return is_element ? holder->GetIndexedInterceptor()
                       : holder->GetNamedInterceptor();
   }
@@ skipping 45 matching lines @@
   const Handle<JSReceiver> initial_holder_;
   const uint32_t index_;
   uint32_t number_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_LOOKUP_H_