public long identityHashValueFor(Oop obj) 
{
    Mark mark = obj.getMark();
    if (mark.isUnlocked()) {
      // FIXME: can not generate marks in debugging system
      return mark.hash();
    } else if (mark.hasMonitor()) {
      ObjectMonitor monitor = mark.monitor();
      Mark temp = monitor.header();
      return temp.hash();
    } else {
      if (Assert.ASSERTS_ENABLED) {
        Assert.that(VM.getVM().isDebugging(), "Can not access displaced header otherwise");
      }
      if (mark.hasDisplacedMarkHelper()) {
        Mark temp = mark.displacedMarkHelper();
        return temp.hash();
      }
      // FIXME: can not do anything else here in debugging system
      return 0;
    }
}

 public static Iterator objectMonitorIterator() 
{
    if (gBlockListAddr != null) {
      return new ObjectMonitorIterator();
    } else {
      return null;
    }
}