if (VM_Controller.options.DYNAMIC_CALL_FILE_OUTPUT != null) return;
  public synchronized void decay() {     double rate = VM_Controller.options.DCG_DECAY_RATE;    for (Iterator iterator = callGraph.values().iterator(); iterator.hasNext();) {      VM_WeightedCallTargets ct = (VM_WeightedCallTargets)iterator.next();      ct.decay(rate);    }    totalEdgeWeights /= rate;  }