Speed up ArrayBuffer/typed array/DataView properties.

src/accessors.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 68 matching lines @@
   // Accessor functions called directly from the runtime system.
   static Handle<Object> FunctionSetPrototype(Handle<JSFunction> object,
                                              Handle<Object> value);
   static Handle<Object> FunctionGetPrototype(Handle<JSFunction> object);
   static Handle<Object> FunctionGetArguments(Handle<JSFunction> object);
 
   // Accessor infos.
   static Handle<AccessorInfo> MakeModuleExport(
       Handle<String> name, int index, PropertyAttributes attributes);
 
+  // Returns true for properties that are accessors to object fields.
+  // If true, *object_offset contains offset of object field.
+  static bool IsJSObjectFieldAccessor(
+      Handle<Map> map, Handle<String> name,
+      int* object_offset);
+
+
  private:
   // Accessor functions only used through the descriptor.
   static MaybeObject* FunctionSetPrototype(Isolate* isolate,
                                            JSObject* object,
                                            Object*,
                                            void*);
   static MaybeObject* FunctionGetPrototype(Isolate* isolate,
                                            Object* object,
                                            void*);
   static MaybeObject* FunctionGetLength(Isolate* isolate,
@@ skipping 51 matching lines @@
   static Object* IllegalGetAccessor(Isolate* isolate, Object* object, void*);
   static MaybeObject* ReadOnlySetAccessor(Isolate* isolate,
                                           JSObject*,
                                           Object* value,
                                           void*);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ACCESSORS_H_