protected Set<D> computeCallFlowFunction(FlowFunction<D> callFlowFunction,D d1,D d2){
  return callFlowFunction.computeTargets(d2);
}

protected Set < D > computeCallFlowFunction ( FlowFunction < D > callFlowFunction , D d1 , D d2 ) { return callFlowFunction . computeTargets ( d2 ) ; }
computes the call flow function for the given call - site abstraction
