Never let the hole escape...

src/objects.h

 // Copyright 2012 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 7926 matching lines @@
 
   void set(AccessorComponent component, Object* value) {
     ASSERT(component == ACCESSOR_GETTER || component == ACCESSOR_SETTER);
     if (component == ACCESSOR_GETTER) {
       set_getter(value);
     } else {
       set_setter(value);
     }
   }
 
+  // Same as get, but returns undefined instead of the hole.
+  Object* SafeGet(AccessorComponent component);

[ulan, 2012/03/07 09:59:34]

Consider marking this function as inline.

+
   bool ContainsAccessor() {
     return IsJSAccessor(getter()) || IsJSAccessor(setter());
   }
 
 #ifdef OBJECT_PRINT
   void AccessorPairPrint(FILE* out = stdout);
 #endif
 #ifdef DEBUG
   void AccessorPairVerify();
 #endif
@@ skipping 504 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_