Share Maps for ElementsKind transitions

src/objects.h

 // Copyright 2011 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 1842 matching lines @@
   MUST_USE_RESULT MaybeObject* AddConstantFunctionProperty(
       String* name,
       JSFunction* function,
       PropertyAttributes attributes);
 
   MUST_USE_RESULT MaybeObject* ReplaceSlowProperty(
       String* name,
       Object* value,
       PropertyAttributes attributes);
 
+
+  // Returns a new map with all transitions dropped from the object's current
+  // map and the ElementsKind set.
+  MUST_USE_RESULT MaybeObject* GetElementsTransitionMap(
+      ElementsKind elements_kind);
+
   // Converts a descriptor of any other type to a real field,
   // backed by the properties array.  Descriptors of visible
   // types, such as CONSTANT_FUNCTION, keep their enumeration order.
   // Converts the descriptor on the original object's map to a
   // map transition, and the the new field is on the object's new map.
   MUST_USE_RESULT MaybeObject* ConvertDescriptorToFieldAndMapTransition(
       String* name,
       Object* new_value,
       PropertyAttributes attributes);
 
@@ skipping 2258 matching lines @@
 
   MUST_USE_RESULT MaybeObject* CopyDropDescriptors();
 
   MUST_USE_RESULT MaybeObject* CopyNormalized(PropertyNormalizationMode mode,
                                               NormalizedMapSharingMode sharing);
 
   // Returns a copy of the map, with all transitions dropped from the
   // instance descriptors.
   MUST_USE_RESULT MaybeObject* CopyDropTransitions();
 
-  // Returns this map if it already has elements that are fast, otherwise
-  // returns a copy of the map, with all transitions dropped from the
-  // descriptors and the ElementsKind set to FAST_ELEMENTS.
-  MUST_USE_RESULT inline MaybeObject* GetFastElementsMap();
-
-  // Returns this map if it already has fast elements that are doubles,
-  // otherwise returns a copy of the map, with all transitions dropped from the
-  // descriptors and the ElementsKind set to FAST_DOUBLE_ELEMENTS.
-  MUST_USE_RESULT inline MaybeObject* GetFastDoubleElementsMap();
-
-  // Returns this map if already has dictionary elements, otherwise returns a
-  // copy of the map, with all transitions dropped from the descriptors and the
-  // ElementsKind set to DICTIONARY_ELEMENTS.
-  MUST_USE_RESULT inline MaybeObject* GetSlowElementsMap();
-
-  // Returns a new map with all transitions dropped from the descriptors and the
-  // ElementsKind set.
-  MUST_USE_RESULT MaybeObject* GetElementsTransitionMap(
-      ElementsKind elements_kind,
-      bool safe_to_add_transition);
-
   // Returns the property index for name (only valid for FAST MODE).
   int PropertyIndexFor(String* name);
 
   // Returns the next free property index (only valid for FAST MODE).
   int NextFreePropertyIndex();
 
   // Returns the number of properties described in instance_descriptors.
   int NumberOfDescribedProperties();
 
   // Casting.
@@ skipping 3314 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_