Built-in JSON support

src/property.h

 // Copyright 2006-2008 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 227 matching lines @@
   bool IsProperty() {
     return IsValid() && type() < FIRST_PHANTOM_PROPERTY_TYPE;
   }
 
   bool IsCacheable() { return cacheable_; }
   void DisallowCaching() { cacheable_ = false; }
 
   // Tells whether the value needs to be loaded.
   bool IsLoaded() {
     if (lookup_type_ == DESCRIPTOR_TYPE || lookup_type_ == DICTIONARY_TYPE) {
-      Object* value = GetValue();
-      if (value->IsJSFunction()) {
-        return JSFunction::cast(value)->IsLoaded();
-      }
+      Object* target = GetLazyValue();
+      return !target->IsJSObject() || JSObject::cast(target)->IsLoaded();
     }
     return true;
   }
 
+  Object* GetLazyValue() {
+    switch (type()) {
+      case FIELD:
+        return holder()->FastPropertyAt(GetFieldIndex());
+      case NORMAL:
+        return holder()->property_dictionary()->ValueAt(GetDictionaryEntry());
+      case CONSTANT_FUNCTION:
+        return GetConstantFunction();
+      default:
+        return Smi::FromInt(0);
+    }
+  }
+
   Map* GetTransitionMap() {
     ASSERT(lookup_type_ == DESCRIPTOR_TYPE);
     ASSERT(type() == MAP_TRANSITION);
     return Map::cast(GetValue());
   }
 
   int GetFieldIndex() {
     ASSERT(lookup_type_ == DESCRIPTOR_TYPE);
     ASSERT(type() == FIELD);
     return Descriptor::IndexFromValue(GetValue());
@@ skipping 121 matching lines @@
 
   // Append a descriptor to this stream.
   void Write(Descriptor* desc);
   // Read a descriptor from the reader and append it to this stream.
   void WriteFrom(DescriptorReader* reader);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PROPERTY_H_