sinterface IManagedObjectCollector_v {
  // notify collector that there is an object in a location
  public void noteObject(VAddr start, int size);
  
  // same plus callback after compaction
  public void noteObject(VAddr start, int size, IVF1<VAddr> updateAddress);
  
  // notify collector that there is a pointer in a location
  public void notePointer(VAddr addr, IVF1<VAddr> updateAddress);
  
  default public void notePointer(VAddr addr) { notePointer(addr, null); }
  
  public void noteRootPointer(VAddr addr);
  
  // notify collector that there is a pointer array in a location
  public void notePointerArray(VAddr start);
  
  // notify collector that there is an int array in a location
  public void noteIntArray(VAddr start);
  
  void noteString(VAddr addr, IVF1<VAddr> updateAddress);
  //default void noteString(VAddr addr) { noteString(addr, null); }
  
  // call after collectAndCompact to get new location of objects
  // XX - I think we don't need this. Object moves are done through
  // callbacks (updateAddress) and are incremental and concurrent now
  VAddr getNewLocation(VAddr addr);
}