Handlefy Descriptor and other code in objects.cc

src/objects.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 2169 matching lines @@
   // fixed_cow_array_map (for copy-on-write arrays). In the latter case
   // the elements array may be shared by a few objects and so before
   // writing to any element the array must be copied. Use
   // EnsureWritableFastElements in this case.
   //
   // In the slow mode the elements is either a NumberDictionary, an
   // ExternalArray, or a FixedArray parameter map for a (sloppy)
   // arguments object.
   DECL_ACCESSORS(elements, FixedArrayBase)
   inline void initialize_elements();
-  MUST_USE_RESULT inline MaybeObject* ResetElements();
   static void ResetElements(Handle<JSObject> object);
   static inline void SetMapAndElements(Handle<JSObject> object,
                                        Handle<Map> map,
                                        Handle<FixedArrayBase> elements);
   inline ElementsKind GetElementsKind();
   inline ElementsAccessor* GetElementsAccessor();
   // Returns true if an object has elements of FAST_SMI_ELEMENTS ElementsKind.
   inline bool HasFastSmiElements();
   // Returns true if an object has elements of FAST_ELEMENTS ElementsKind.
   inline bool HasFastObjectElements();
@@ skipping 377 matching lines @@
   // (storage->length() == NumberOfEnumElements()).
   // If storage is NULL, will count the elements without adding
   // them to any storage.
   // Returns the number of enumerable elements.
   int GetEnumElementKeys(FixedArray* storage);
 
   // Returns a new map with all transitions dropped from the object's current
   // map and the ElementsKind set.
   static Handle<Map> GetElementsTransitionMap(Handle<JSObject> object,
                                               ElementsKind to_kind);
-  inline MUST_USE_RESULT MaybeObject* GetElementsTransitionMap(
-      Isolate* isolate,
-      ElementsKind elements_kind);
-  MUST_USE_RESULT MaybeObject* GetElementsTransitionMapSlow(
-      ElementsKind elements_kind);
+  static Handle<Map> GetElementsTransitionMapSlow(Handle<JSObject> object,
+                                                  ElementsKind elements_kind);
 
   static void TransitionElementsKind(Handle<JSObject> object,
                                      ElementsKind to_kind);
 
   // TODO(mstarzinger): Both public because of ConvertAnsSetLocalProperty().
   static void MigrateToMap(Handle<JSObject> object, Handle<Map> new_map);
   static void GeneralizeFieldRepresentation(Handle<JSObject> object,
                                             int modify_index,
                                             Representation new_representation,
                                             StoreMode store_mode);
@@ skipping 869 matching lines @@
                                        int modify_index,
                                        StoreMode store_mode,
                                        Handle<Map> right_map)
       V8_WARN_UNUSED_RESULT;
 
   bool IsMoreGeneralThan(int verbatim,
                          int valid,
                          int new_size,
                          DescriptorArray* other);
 
-  MUST_USE_RESULT MaybeObject* CopyUpTo(int enumeration_index) {
-    return CopyUpToAddAttributes(enumeration_index, NONE);
-  }
+  static Handle<DescriptorArray> CopyUpTo(Handle<DescriptorArray> desc,
+                                          int enumeration_index);
 
   static Handle<DescriptorArray> CopyUpToAddAttributes(
       Handle<DescriptorArray> desc,
       int enumeration_index,
       PropertyAttributes attributes);
-  MUST_USE_RESULT MaybeObject* CopyUpToAddAttributes(
-      int enumeration_index,
-      PropertyAttributes attributes);
 
   // Sort the instance descriptors by the hash codes of their keys.
   void Sort();
 
   // Search the instance descriptors for given name.
   INLINE(int Search(Name* name, int number_of_own_descriptors));
 
   // As the above, but uses DescriptorLookupCache and updates it when
   // necessary.
   INLINE(int SearchWithCache(Name* name, Map* map));
@@ skipping 2674 matching lines @@
   static bool IsValidElementsTransition(ElementsKind from_kind,
                                         ElementsKind to_kind);
 
   // Returns true if the current map doesn't have DICTIONARY_ELEMENTS but if a
   // map with DICTIONARY_ELEMENTS was found in the prototype chain.
   bool DictionaryElementsInPrototypeChainOnly();
 
   inline bool HasTransitionArray();
   inline bool HasElementsTransition();
   inline Map* elements_transition_map();
-  MUST_USE_RESULT inline MaybeObject* set_elements_transition_map(
-      Map* transitioned_map);
+  static Handle<TransitionArray> SetElementsTransitionMap(
+      Handle<Map> map, Handle<Map> transitioned_map);
   inline void SetTransition(int transition_index, Map* target);
   inline Map* GetTransition(int transition_index);
   inline int SearchTransition(Name* name);
+  inline FixedArrayBase* GetInitialElements();
 
   static Handle<TransitionArray> AddTransition(Handle<Map> map,
                                                Handle<Name> key,
                                                Handle<Map> target,
                                                SimpleTransitionFlag flag);
-
-  MUST_USE_RESULT inline MaybeObject* AddTransition(Name* key,
-                                                    Map* target,
-                                                    SimpleTransitionFlag flag);
   DECL_ACCESSORS(transitions, TransitionArray)
   inline void ClearTransitions(Heap* heap,
                                WriteBarrierMode mode = UPDATE_WRITE_BARRIER);
 
   void DeprecateTransitionTree();
   void DeprecateTarget(Name* key, DescriptorArray* new_descriptors);
 
   Map* FindRootMap();
   Map* FindUpdatedMap(int verbatim, int length, DescriptorArray* descriptors);
   Map* FindLastMatchMap(int verbatim, int length, DescriptorArray* descriptors);
@@ skipping 185 matching lines @@
   // descriptor array of the map. Returns NULL if no updated map is found.
   // This method also applies any pending migrations along the prototype chain.
   static Handle<Map> CurrentMapForDeprecated(Handle<Map> map);
   // Same as above, but does not touch the prototype chain.
   static Handle<Map> CurrentMapForDeprecatedInternal(Handle<Map> map);
 
   static Handle<Map> RawCopy(Handle<Map> map, int instance_size);
   MUST_USE_RESULT MaybeObject* RawCopy(int instance_size);
   static Handle<Map> CopyDropDescriptors(Handle<Map> map);
   MUST_USE_RESULT MaybeObject* CopyDropDescriptors();
-  static Handle<Map> CopyReplaceDescriptors(Handle<Map> map,
-                                            Handle<DescriptorArray> descriptors,
-                                            TransitionFlag flag,
-                                            Handle<Name> name);
-  MUST_USE_RESULT MaybeObject* CopyReplaceDescriptors(
-      DescriptorArray* descriptors,
+  static Handle<Map> CopyReplaceDescriptors(
+      Handle<Map> map,
+      Handle<DescriptorArray> descriptors,
       TransitionFlag flag,
-      Name* name = NULL,
+      Handle<Name> name,
+      SimpleTransitionFlag simple_flag = FULL_TRANSITION);
+  static Handle<Map> CopyReplaceDescriptors(
+      Handle<Map> map,
+      Handle<DescriptorArray> descriptors,
+      TransitionFlag flag,
       SimpleTransitionFlag simple_flag = FULL_TRANSITION);
   static Handle<Map> CopyInstallDescriptors(
       Handle<Map> map,
       int new_descriptor,
       Handle<DescriptorArray> descriptors);
-  MUST_USE_RESULT MaybeObject* ShareDescriptor(DescriptorArray* descriptors,
-                                               Descriptor* descriptor);
-  MUST_USE_RESULT MaybeObject* CopyAddDescriptor(Descriptor* descriptor,
-                                                 TransitionFlag flag);
-  MUST_USE_RESULT MaybeObject* CopyInsertDescriptor(Descriptor* descriptor,
-                                                    TransitionFlag flag);
-  MUST_USE_RESULT MaybeObject* CopyReplaceDescriptor(
-      DescriptorArray* descriptors,
+  static Handle<Map> ShareDescriptor(Handle<Map> map,
+                                     Handle<DescriptorArray> descriptors,
+                                     Descriptor* descriptor);
+  static Handle<Map> CopyAddDescriptor(Handle<Map> map,
+                                       Descriptor* descriptor,
+                                       TransitionFlag flag);
+  static Handle<Map> CopyInsertDescriptor(Handle<Map> map,
+                                          Descriptor* descriptor,
+                                          TransitionFlag flag);
+  static Handle<Map> CopyReplaceDescriptor(
+      Handle<Map> map,
+      Handle<DescriptorArray> descriptors,
       Descriptor* descriptor,
       int index,
       TransitionFlag flag);
 
-  MUST_USE_RESULT MaybeObject* AsElementsKind(ElementsKind kind);
-
   static Handle<Map> AsElementsKind(Handle<Map> map, ElementsKind kind);
 
-  MUST_USE_RESULT MaybeObject* CopyAsElementsKind(ElementsKind kind,
-                                                  TransitionFlag flag);
+  static Handle<Map> CopyAsElementsKind(Handle<Map> map,
+                                        ElementsKind kind,
+                                        TransitionFlag flag);
 
   static Handle<Map> CopyForObserved(Handle<Map> map);
 
   static Handle<Map> CopyNormalized(Handle<Map> map,
                                     PropertyNormalizationMode mode,
                                     NormalizedMapSharingMode sharing);
 
   inline void AppendDescriptor(Descriptor* desc,
                                const DescriptorArray::WhitenessWitness&);
 
   // Returns a copy of the map, with all transitions dropped from the
   // instance descriptors.
   static Handle<Map> Copy(Handle<Map> map);
   static Handle<Map> Create(Handle<JSFunction> constructor,
                             int extra_inobject_properties);
-  MUST_USE_RESULT MaybeObject* Copy();
 
   // Returns the next free property index (only valid for FAST MODE).
   int NextFreePropertyIndex();
 
   // Returns the number of properties described in instance_descriptors
   // filtering out properties with the specified attributes.
   int NumberOfDescribedProperties(DescriptorFlag which = OWN_DESCRIPTORS,
                                   PropertyAttributes filter = NONE);
 
   // Returns the number of slots allocated for the initial properties
@@ skipping 4557 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_