final public int shift_operator() throws ParseException {
    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case SLL:
      jj_consume_token(SLL);
                          {if (true) return 1;}
      break;
    case SRL:
      jj_consume_token(SRL);
                          {if (true) return 2;}
      break;
    case SLA:
      jj_consume_token(SLA);
                          {if (true) return 3;}
      break;
    case SRA:
      jj_consume_token(SRA);
                          {if (true) return 4;}
      break;
    case ROL:
      jj_consume_token(ROL);
                          {if (true) return 5;}
      break;
    case ROR:
      jj_consume_token(ROR);
                          {if (true) return 6;}
      break;
    default:
      jj_la1[131] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
    throw new Error("Missing return statement in function");
  }