Add support for API accessors that prohibit overwriting by accessors...

src/apinatives.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 64 matching lines @@
     }
     ConfigureTemplateInstance(fun, data);
   }
   return kApiFunctionCache[serialNumber];
 }
 
 
 function ConfigureTemplateInstance(obj, data) {
   var properties = %GetTemplateField(data, kApiPropertyListOffset);
   if (properties) {
+    // Disable access checks while instantiating the object.
+    var requires_access_checks = %DisableAccessChecks(obj);
     for (var i = 0; i < properties[0]; i += 3) {
       var name = properties[i + 1];
       var prop_data = properties[i + 2];
       var attributes = properties[i + 3];
       var value = Instantiate(prop_data, name);
       %SetProperty(obj, name, value, attributes);
     }
+    if (requires_access_checks) %EnableAccessChecks(obj);

[Kasper Lund, 2008/10/30 12:32:27]

Should this be in some sort of try-finally to play it safely?

   }
 }