Added Extensible property to objects and made methods for extracting and sett...

src/runtime.cc

 // Copyright 2006-2009 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 565 matching lines @@
 
 
 // Returns an array with the property description:
 //  if args[1] is not a property on args[0]
 //          returns undefined
 //  if args[1] is a data property on args[0]
 //         [false, value, Writeable, Enumerable, Configurable]
 //  if args[1] is an accessor on args[0]
 //         [true, GetFunction, SetFunction, Enumerable, Configurable]
 static Object* Runtime_GetOwnProperty(Arguments args) {
+  ASSERT(args.lenght() == 2);
   HandleScope scope;
   Handle<FixedArray> elms = Factory::NewFixedArray(5);
   Handle<JSArray> desc = Factory::NewJSArrayWithElements(elms);
   LookupResult result;
   CONVERT_CHECKED(JSObject, obj, args[0]);
   CONVERT_CHECKED(String, name, args[1]);
 
   // Use recursive implementation to also traverse hidden prototypes
   GetOwnPropertyImplementation(obj, name, &result);
 
@@ skipping 23 matching lines @@
     elms->set(1, result.GetLazyValue());
     elms->set(2, Heap::ToBoolean(!result.IsReadOnly()));
   }
 
   elms->set(3, Heap::ToBoolean(!result.IsDontEnum()));
   elms->set(4, Heap::ToBoolean(!result.IsReadOnly()));
   return *desc;
 }
 
 
+static Object* Runtime_IsExtensible(Arguments args) {
+  ASSERT(args.length() == 1);
+  CONVERT_CHECKED(JSObject, obj, args[0]);
+  return obj->map()->is_extensible() ?  Heap::true_value()
+                                     : Heap::false_value();
+}
+
+
 static Object* Runtime_RegExpCompile(Arguments args) {
   HandleScope scope;
   ASSERT(args.length() == 3);
   CONVERT_ARG_CHECKED(JSRegExp, re, 0);
   CONVERT_ARG_CHECKED(String, pattern, 1);
   CONVERT_ARG_CHECKED(String, flags, 2);
   Handle<Object> result = RegExpImpl::Compile(re, pattern, flags);
   if (result.is_null()) return Failure::Exception();
   return *result;
 }
@@ skipping 7515 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal