Hide native Date implementation in function context.

src/v8natives.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file relies on the fact that the following declarations have been made
 // in runtime.js:
 // var $Object = global.Object;
 // var $Boolean = global.Boolean;
 // var $Number = global.Number;
 // var $Function = global.Function;
@@ skipping 14 matching lines @@
     var f = functions[i + 1];
     %FunctionSetName(f, key);
     %FunctionRemovePrototype(f);
     %AddNamedProperty(object, key, f, attributes);
     %SetNativeFlag(f);
   }
   %ToFastProperties(object);
 }
 
 
+function OverrideFunction(object, name, f) {
+  ObjectDefineProperty(object, name, { value: f,
+                                       writeable: true,
+                                       configurable: true,
+                                       enumerable: false });
+  %FunctionSetName(f, name);
+  %FunctionRemovePrototype(f);
+  %SetNativeFlag(f);
+}
+
+
 // Helper function to install a getter-only accessor property.
 function InstallGetter(object, name, getter) {
   %FunctionSetName(getter, name);
   %FunctionRemovePrototype(getter);
   %DefineAccessorPropertyUnchecked(object, name, getter, null, DONT_ENUM);
   %SetNativeFlag(getter);
 }
 
 
 // Helper function to install a getter/setter accessor property.
@@ skipping 1838 matching lines @@
   }
   if (!IS_SPEC_FUNCTION(method)) {
     throw MakeTypeError('not_iterable', [obj]);
   }
   var iterator = %_CallFunction(obj, method);
   if (!IS_SPEC_OBJECT(iterator)) {
     throw MakeTypeError('not_an_iterator', [iterator]);
   }
   return iterator;
 }