sinterface IManagedObjectCollector {
  // notify collector that there is an object in a location
  public void noteObject(int start, int size);
  
  // same plus callback after compaction
  public void noteObject(int start, int size, IVF1<Int> updateAddress);
  
  // notify collector that there is a pointer in a location
  public void notePointer(int addr, IVF1<Int> updateAddress);
  
  default public void notePointer(int addr) { notePointer(addr, null); }
  
  public void noteRootPointer(int addr);
  
  // notify collector that there is a pointer array in a location
  public void notePointerArray(int start);
  
  // notify collector that there is an int array in a location
  public void noteIntArray(int start);
  
  void noteString(int addr, IVF1<Int> updateAddress);
  //default void noteString(int addr) { noteString(addr, null); }
  
  // call after collectAndCompact to get new location of objects
  int getNewLocation(int addr);
}