sclass ManagedObjectCollector {
  // notify collector that there is an object in a location
  public void noteObject(int start, int size);
  
  // notify collector that there is a pointer in a location
  public void notePointer(int addr);
  
  // notify collector that there is a pointer array in a location
  public void notePointerArray(int start);
  
  // call after collectAndCompact to get new location of objects
  int getNewLocation(int addr);
}