Add ES5 Object.freeze and Object.isFrozen methods....

src/v8natives.js

 // 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 705 matching lines @@
   }
   var name = ToString(p);
   var desc = ToPropertyDescriptor(attributes);
   DefineOwnProperty(obj, name, desc, true);
   return obj;
 }
 
 
 // ES5 section 15.2.3.7.
 function ObjectDefineProperties(obj, properties) {
- if ((!IS_SPEC_OBJECT_OR_NULL(obj) || IS_NULL_OR_UNDEFINED(obj)) &&
+  if ((!IS_SPEC_OBJECT_OR_NULL(obj) || IS_NULL_OR_UNDEFINED(obj)) &&
      !IS_UNDETECTABLE(obj))
     throw MakeTypeError("obj_ctor_property_non_object", ["defineProperties"]);
   var props = ToObject(properties);
   var key_values = [];
   for (var key in props) {
     if (%HasLocalProperty(props, key)) {
       key_values.push(key);
       var value = props[key];
       var desc = ToPropertyDescriptor(value);
       key_values.push(desc);
     }
   }
   for (var i = 0; i < key_values.length; i += 2) {
     var key = key_values[i];
     var desc = key_values[i + 1];
     DefineOwnProperty(obj, key, desc, true);
   }
   return obj;
 }
 
 
+// ES5 section 15.2.3.9.
+function ObjectFreeze(obj) {
+  if ((!IS_SPEC_OBJECT_OR_NULL(obj) || IS_NULL_OR_UNDEFINED(obj)) &&
+      !IS_UNDETECTABLE(obj)) {
+    throw MakeTypeError("obj_ctor_property_non_object", ["freeze"]);
+  }
+  var names = ObjectGetOwnPropertyNames(obj);
+  for (var key in names) {
+    var name = names[key];
+    var desc = GetOwnProperty(obj, name);
+    if (IsDataDescriptor(desc)) desc.setWritable(false);
+    if (desc.isConfigurable()) desc.setConfigurable(false);
+    DefineOwnProperty(obj, name, desc, true);
+  }  
+  ObjectPreventExtension(obj);
+}
+
+
 // ES5 section 15.2.3.10
 function ObjectPreventExtension(obj) {
   if ((!IS_SPEC_OBJECT_OR_NULL(obj) || IS_NULL_OR_UNDEFINED(obj)) &&
       !IS_UNDETECTABLE(obj)) {
     throw MakeTypeError("obj_ctor_property_non_object", ["preventExtension"]);
   }
   %PreventExtensions(obj);
   return obj;
 }
 
 
+// ES5 section 15.2.3.12
+function ObjectIsFrozen(obj) {
+  if ((!IS_SPEC_OBJECT_OR_NULL(obj) || IS_NULL_OR_UNDEFINED(obj)) &&
+      !IS_UNDETECTABLE(obj)) {
+    throw MakeTypeError("obj_ctor_property_non_object", ["isFrozen"]);
+  }
+  var names = ObjectGetOwnPropertyNames(obj);
+  for (var key in names) {
+    var name = names[key];
+    var desc = GetOwnProperty(obj, name);
+    if (IsDataDescriptor(desc) && desc.writable) return false;
+    if (desc.configurable) return false;
+  }
+  if (!ObjectIsExtensible(obj)) {
+    return true;
+  }
+  return false;
+}
+
+
 // ES5 section 15.2.3.13
 function ObjectIsExtensible(obj) {
   if ((!IS_SPEC_OBJECT_OR_NULL(obj) || IS_NULL_OR_UNDEFINED(obj)) &&
       !IS_UNDETECTABLE(obj)) {
     throw MakeTypeError("obj_ctor_property_non_object", ["preventExtension"]);
   }
   return %IsExtensible(obj);
 }
 
 
@@ skipping 23 matching lines @@
     "__defineGetter__", ObjectDefineGetter,
     "__lookupGetter__", ObjectLookupGetter,
     "__defineSetter__", ObjectDefineSetter,
     "__lookupSetter__", ObjectLookupSetter
   ));
   InstallFunctions($Object, DONT_ENUM, $Array(
     "keys", ObjectKeys,
     "create", ObjectCreate,
     "defineProperty", ObjectDefineProperty,
     "defineProperties", ObjectDefineProperties,
+    "freeze", ObjectFreeze,
     "getPrototypeOf", ObjectGetPrototypeOf,
     "getOwnPropertyDescriptor", ObjectGetOwnPropertyDescriptor,
     "getOwnPropertyNames", ObjectGetOwnPropertyNames,
     "isExtensible", ObjectIsExtensible,
+    "isFrozen", ObjectIsFrozen,
     "preventExtensions", ObjectPreventExtension
   ));
 }
 
 SetupObject();
 
 
 // ----------------------------------------------------------------------------
 // Boolean
 
@@ skipping 248 matching lines @@
 
 // ----------------------------------------------------------------------------
 
 function SetupFunction() {
   InstallFunctions($Function.prototype, DONT_ENUM, $Array(
     "toString", FunctionToString
   ));
 }
 
 SetupFunction();