First implementation of lazily cached accessor for DOM attributes.

third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 55 matching lines @@
   };
 
   // Bit field to select which worlds the member will be defined in.
   enum WorldConfiguration : unsigned {
     kMainWorld = 1 << 0,
     kNonMainWorlds = 1 << 1,
     kAllWorlds = kMainWorld | kNonMainWorlds,
   };
 
   typedef v8::Local<v8::Private> (*CachedPropertyKey)(v8::Isolate*);
+  typedef void (*CachedAccessorInitCallback)(v8::Isolate*,
+                                             v8::Local<v8::Object>);
 
   // AttributeConfiguration translates into calls to SetNativeDataProperty() on
   // either the instance or the prototype ObjectTemplate, based on
   // |propertyLocationConfiguration|.
   struct AttributeConfiguration {
     AttributeConfiguration& operator=(const AttributeConfiguration&) = delete;
     DISALLOW_NEW();
     const char* const name;
     v8::AccessorNameGetterCallback getter;
     v8::AccessorNameSetterCallback setter;
-    // TODO(vogelheim): This has to be removed too since it's only used in
-    //                  accessors.
-    // The accessor's 'result' is stored in a private property.
-    CachedPropertyKey cached_property_key;
+
     const WrapperTypeInfo* data;
     // v8::PropertyAttribute
     unsigned attribute : 8;
     // PropertyLocationConfiguration
     unsigned property_location_configuration : 3;
     // HolderCheckConfiguration
     unsigned holder_check_configuration : 1;
     // WorldConfiguration
     unsigned world_configuration : 2;
   };
@@ skipping 35 matching lines @@
   // AccessorConfiguration translates into calls to SetAccessorProperty()
   // on prototype ObjectTemplate.
   struct AccessorConfiguration {
     AccessorConfiguration& operator=(const AccessorConfiguration&) = delete;
     DISALLOW_NEW();
     const char* const name;
     v8::FunctionCallback getter;
     v8::FunctionCallback setter;
     // The accessor's 'result' is stored in a private property.
     CachedPropertyKey cached_property_key;
+    CachedAccessorInitCallback cached_accessor_init_callback;
     const WrapperTypeInfo* data;
     // v8::PropertyAttribute
     unsigned attribute : 8;
     // PropertyLocationConfiguration
     unsigned property_location_configuration : 3;
     // HolderCheckConfiguration
     unsigned holder_check_configuration : 1;
     // WorldConfiguration
     unsigned world_configuration : 2;
   };
@@ skipping 173 matching lines @@
   // Sets the class string of platform objects, interface prototype objects,
   // etc.  See also http://heycam.github.io/webidl/#dfn-class-string
   static void SetClassString(v8::Isolate*,
                              v8::Local<v8::ObjectTemplate>,
                              const char* class_string);
 };
 
 }  // namespace blink
 
 #endif  // V8DOMConfiguration_h