Implemented lazy sweeping of new space.

src/objects-inl.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 1231 matching lines @@
   v->VisitPointers(reinterpret_cast<Object**>(FIELD_ADDR(this, start)),
                    reinterpret_cast<Object**>(FIELD_ADDR(this, end)));
 }
 
 
 void HeapObject::IteratePointer(ObjectVisitor* v, int offset) {
   v->VisitPointer(reinterpret_cast<Object**>(FIELD_ADDR(this, offset)));
 }
 
 
+void HeapObject::ClearDeadObject() {
+  Address& map_field = Memory::Address_at(address());
+  if (GetHeap()->map_space()->Contains(map_field)) {
+    map_field = NULL;
+  }
+}
+
+
 double HeapNumber::value() {
   return READ_DOUBLE_FIELD(this, kValueOffset);
 }
 
 
 void HeapNumber::set_value(double value) {
   WRITE_DOUBLE_FIELD(this, kValueOffset, value);
 }
 
 
@@ skipping 4920 matching lines @@
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_