Implemented lazy sweeping of new space.

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 1437 matching lines @@
   static inline HeapObject* cast(Object* obj);
 
   // Return the write barrier mode for this. Callers of this function
   // must be able to present a reference to an DisallowHeapAllocation
   // object as a sign that they are not going to use this function
   // from code that allocates and thus invalidates the returned write
   // barrier mode.
   inline WriteBarrierMode GetWriteBarrierMode(
       const DisallowHeapAllocation& promise);
 
+  // Set the map field of the object to NULL if contains a map.
+  inline void ClearDeadObject();

[titzer, 2013/07/11 08:22:23]

I don't think this method should live on the HeapObject itself. Can you make it
private to the class where it is used?

[Hannes Payer (out of office), 2013/07/11 08:43:10]

Done.

+
   // Dispatched behavior.
   void HeapObjectShortPrint(StringStream* accumulator);
 #ifdef OBJECT_PRINT
   inline void HeapObjectPrint() {
     HeapObjectPrint(stdout);
   }
   void HeapObjectPrint(FILE* out);
   void PrintHeader(FILE* out, const char* id);
 #endif
   DECLARE_VERIFIER(HeapObject)
@@ skipping 8342 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_