Create pre-frozen change records for Object.observe

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 2199 matching lines @@
   class BodyDescriptor : public FlexibleBodyDescriptor<kPropertiesOffset> {
    public:
     static inline int SizeOf(Map* map, HeapObject* object);
   };
 
   // Enqueue change record for Object.observe. May cause GC.
   static void EnqueueChangeRecord(Handle<JSObject> object,
                                   const char* type,
                                   Handle<String> name,
                                   Handle<Object> old_value);
+  static void EnqueueChangeRecord(Handle<JSObject> object,
+                                  Handle<String> type,
+                                  Handle<String> name,
+                                  Handle<Object> old_value);
 
   // Deliver change records to observers. May cause GC.
   static void DeliverChangeRecords(Isolate* isolate);
 
  private:
   friend class DictionaryElementsAccessor;
 
   MUST_USE_RESULT MaybeObject* GetElementWithCallback(Object* receiver,
                                                       Object* structure,
                                                       uint32_t index,
@@ skipping 6087 matching lines @@
   static const int kInputOffset = kIndexOffset + kPointerSize;
   static const int kSize = kInputOffset + kPointerSize;
   // Indices of in-object properties.
   static const int kIndexIndex = 0;
   static const int kInputIndex = 1;
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSRegExpResult);
 };
 
 
+// JSChangeRecords are JSObjects with a particular initial map
+// that includes in-object properties and non-extensibility.
+class JSChangeRecord: public JSObject {
+ public:
+  // Offsets of object fields.
+  static const int kTypeOffset = JSObject::kHeaderSize;
+  static const int kObjectOffset = kTypeOffset + kPointerSize;
+  static const int kNameOffset = kObjectOffset + kPointerSize;
+  static const int kOldValueOffset = kNameOffset + kPointerSize;
+  static const int kSize = kOldValueOffset + kPointerSize;
+  // Indices of in-object properties.
+  static const int kTypeIndex = 0;
+  static const int kObjectIndex = 1;
+  static const int kNameIndex = 2;
+  static const int kOldValueIndex = 3;
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(JSChangeRecord);
+};
+
+
 // An accessor must have a getter, but can have no setter.
 //
 // When setting a property, V8 searches accessors in prototypes.
 // If an accessor was found and it does not have a setter,
 // the request is ignored.
 //
 // If the accessor in the prototype has the READ_ONLY property attribute, then
 // a new value is added to the local object when the property is set.
 // This shadows the accessor in the prototype.
 class AccessorInfo: public Struct {
@@ skipping 548 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_