parser.java

用Java实现的编译器。把源代码编译成SPARC汇编程序

            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 10: // expr ::= NUMBER 
            {
              Integer RESULT = null;
		int nleft = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left;
		int nright = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right;
		Integer n = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-0)).value;
		 RESULT = n; 
              CUP$parser$result = new java_cup.runtime.Symbol(3/*expr*/, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 9: // expr ::= expr MOD expr 
            {
              Integer RESULT = null;
		int e1left = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left;
		int e1right = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).right;
		Integer e1 = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
		int e2left = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left;
		int e2right = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right;
		Integer e2 = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-0)).value;
		 RESULT = new Integer(e1.intValue() % e2.intValue()); 
              CUP$parser$result = new java_cup.runtime.Symbol(3/*expr*/, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 8: // expr ::= expr DIVIDE expr 
            {
              Integer RESULT = null;
		int e1left = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left;
		int e1right = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).right;
		Integer e1 = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
		int e2left = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left;
		int e2right = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right;
		Integer e2 = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-0)).value;
		 RESULT = new Integer(e1.intValue() / e2.intValue()); 
              CUP$parser$result = new java_cup.runtime.Symbol(3/*expr*/, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 7: // expr ::= expr TIMES expr 
            {
              Integer RESULT = null;
		int e1left = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left;
		int e1right = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).right;
		Integer e1 = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
		int e2left = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left;
		int e2right = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right;
		Integer e2 = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-0)).value;
		 RESULT = new Integer(e1.intValue() * e2.intValue()); 
              CUP$parser$result = new java_cup.runtime.Symbol(3/*expr*/, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 6: // expr ::= expr MINUS expr 
            {
              Integer RESULT = null;
		int e1left = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left;
		int e1right = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).right;
		Integer e1 = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
		int e2left = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left;
		int e2right = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right;
		Integer e2 = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-0)).value;
		 RESULT = new Integer(e1.intValue() - e2.intValue()); 
              CUP$parser$result = new java_cup.runtime.Symbol(3/*expr*/, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 5: // expr ::= expr PLUS expr 
            {
              Integer RESULT = null;
		int e1left = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left;
		int e1right = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).right;
		Integer e1 = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
		int e2left = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left;
		int e2right = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right;
		Integer e2 = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-0)).value;
		 RESULT = new Integer(e1.intValue() + e2.intValue()); 
              CUP$parser$result = new java_cup.runtime.Symbol(3/*expr*/, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 4: // expr_part ::= expr NT$0 SEMI 
            {
              Object RESULT = null;
              // propagate RESULT from NT$0
              if ( ((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value != null )
                RESULT = (Object) ((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value;
		int eleft = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left;
		int eright = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).right;
		Integer e = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;

              CUP$parser$result = new java_cup.runtime.Symbol(2/*expr_part*/, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 3: // NT$0 ::= 
            {
              Object RESULT = null;
		int eleft = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left;
		int eright = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right;
		Integer e = (Integer)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-0)).value;
 System.out.println("= " + e); 
              CUP$parser$result = new java_cup.runtime.Symbol(4/*NT$0*/, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 2: // expr_list ::= expr_part 
            {
              Object RESULT = null;

              CUP$parser$result = new java_cup.runtime.Symbol(1/*expr_list*/, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 1: // $START ::= expr_list EOF 
            {
              Object RESULT = null;
		int start_valleft = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-1)).left;
		int start_valright = ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-1)).right;
		Object start_val = (Object)((java_cup.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value;
		RESULT = start_val;
              CUP$parser$result = new java_cup.runtime.Symbol(0/*$START*/, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-1)).left, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          /* ACCEPT */
          CUP$parser$parser.done_parsing();
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 0: // expr_list ::= expr_list expr_part 
            {
              Object RESULT = null;

              CUP$parser$result = new java_cup.runtime.Symbol(1/*expr_list*/, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-1)).left, ((java_cup.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /* . . . . . .*/
          default:
            throw new Exception(
               "Invalid action number found in internal parse table");

        }
    }
}