yylex.java

编译原理大作业---tiger编译器 包括semant,translate,mipsframe,regalloc等所有phase 懂的人自会知道

package Parse;


class Yylex implements Lexer {
	private final int YY_BUFFER_SIZE = 512;
	private final int YY_F = -1;
	private final int YY_NO_STATE = -1;
	private final int YY_NOT_ACCEPT = 0;
	private final int YY_START = 1;
	private final int YY_END = 2;
	private final int YY_NO_ANCHOR = 4;
	private final int YY_BOL = 128;
	private final int YY_EOF = 129;

private ErrorMsg.ErrorMsg errorMsg;
private void newline() { errorMsg.newline(yychar); }
// contatore annidamento commenti
private int commentDepth = 0;
private Integer temp;
// variabile usata per la creazione di una stringa
private String str;
private void err(int pos, String s) { errorMsg.error(pos,s); }
private void err(String s) { err(yychar,s); }
private java_cup.runtime.Symbol tok(int kind, Object value) {
    return new java_cup.runtime.Symbol(kind, yychar, yychar+yylength(), value);
}
Yylex(java.io.InputStream s, ErrorMsg.ErrorMsg e) {
   this(s);
   errorMsg = e;
}
private String[] asciiTable =
   {"","","","","","","","","","","",
    "","","","","","","","","","",
    "","","","","","","","","","",
    ""," ","!","\"","#","$","%","&","'","(",
    ")","*","+",",","-",".","/","0","1","2",
    "3","4","5","6","7","8","9",":",";","<",
    "=",">","?","@","A","B","C","D","E","F",
    "G","H","I","J","K","L","M","N","O","P",
    "Q","R","S","T","U","V","W","X","Y","Z",
    "[","\\","]","^","_","\'","a","b","c","d",
    "e","f","g","h","i","j","k","l","m","n",
    "o","p","q","r","s","t","u","v","w","x",
    "y","z","{","|","}","~",""};
	private java.io.BufferedReader yy_reader;
	private int yy_buffer_index;
	private int yy_buffer_read;
	private int yy_buffer_start;
	private int yy_buffer_end;
	private char yy_buffer[];
	private int yychar;
	private boolean yy_at_bol;
	private int yy_lexical_state;

	Yylex (java.io.Reader reader) {
		this ();
		if (null == reader) {
			throw (new Error("Error: Bad input stream initializer."));
		}
		yy_reader = new java.io.BufferedReader(reader);
	}

	Yylex (java.io.InputStream instream) {
		this ();
		if (null == instream) {
			throw (new Error("Error: Bad input stream initializer."));
		}
		yy_reader = new java.io.BufferedReader(new java.io.InputStreamReader(instream));
	}

	private Yylex () {
		yy_buffer = new char[YY_BUFFER_SIZE];
		yy_buffer_read = 0;
		yy_buffer_index = 0;
		yy_buffer_start = 0;
		yy_buffer_end = 0;
		yychar = 0;
		yy_at_bol = true;
		yy_lexical_state = YYINITIAL;
	}

	private boolean yy_eof_done = false;
	private final int STRING = 2;
	private final int YYINITIAL = 0;
	private final int COMMENT = 1;
	private final int ESCAPES = 3;
	private final int yy_state_dtrans[] = {
		0,
		48,
		68,
		72
	};
	private void yybegin (int state) {
		yy_lexical_state = state;
	}
	private int yy_advance ()
		throws java.io.IOException {
		int next_read;
		int i;
		int j;

		if (yy_buffer_index < yy_buffer_read) {
			return yy_buffer[yy_buffer_index++];
		}

		if (0 != yy_buffer_start) {
			i = yy_buffer_start;
			j = 0;
			while (i < yy_buffer_read) {
				yy_buffer[j] = yy_buffer[i];
				++i;
				++j;
			}
			yy_buffer_end = yy_buffer_end - yy_buffer_start;
			yy_buffer_start = 0;
			yy_buffer_read = j;
			yy_buffer_index = j;
			next_read = yy_reader.read(yy_buffer,
					yy_buffer_read,
					yy_buffer.length - yy_buffer_read);
			if (-1 == next_read) {
				return YY_EOF;
			}
			yy_buffer_read = yy_buffer_read + next_read;
		}

		while (yy_buffer_index >= yy_buffer_read) {
			if (yy_buffer_index >= yy_buffer.length) {
				yy_buffer = yy_double(yy_buffer);
			}
			next_read = yy_reader.read(yy_buffer,
					yy_buffer_read,
					yy_buffer.length - yy_buffer_read);
			if (-1 == next_read) {
				return YY_EOF;
			}
			yy_buffer_read = yy_buffer_read + next_read;
		}
		return yy_buffer[yy_buffer_index++];
	}
	private void yy_move_end () {
		if (yy_buffer_end > yy_buffer_start &&
		    '\n' == yy_buffer[yy_buffer_end-1])
			yy_buffer_end--;
		if (yy_buffer_end > yy_buffer_start &&
		    '\r' == yy_buffer[yy_buffer_end-1])
			yy_buffer_end--;
	}
	private boolean yy_last_was_cr=false;
	private void yy_mark_start () {
		yychar = yychar
			+ yy_buffer_index - yy_buffer_start;
		yy_buffer_start = yy_buffer_index;
	}
	private void yy_mark_end () {
		yy_buffer_end = yy_buffer_index;
	}
	private void yy_to_mark () {
		yy_buffer_index = yy_buffer_end;
		yy_at_bol = (yy_buffer_end > yy_buffer_start) &&
		            ('\r' == yy_buffer[yy_buffer_end-1] ||
		             '\n' == yy_buffer[yy_buffer_end-1] ||
		             2028/*LS*/ == yy_buffer[yy_buffer_end-1] ||
		             2029/*PS*/ == yy_buffer[yy_buffer_end-1]);
	}
	private java.lang.String yytext () {
		return (new java.lang.String(yy_buffer,
			yy_buffer_start,
			yy_buffer_end - yy_buffer_start));
	}
	private int yylength () {
		return yy_buffer_end - yy_buffer_start;
	}
	private char[] yy_double (char buf[]) {
		int i;
		char newbuf[];
		newbuf = new char[2*buf.length];
		for (i = 0; i < buf.length; ++i) {
			newbuf[i] = buf[i];
		}
		return newbuf;
	}
	private final int YY_E_INTERNAL = 0;
	private final int YY_E_MATCH = 1;
	private java.lang.String yy_error_string[] = {
		"Error: Internal error.\n",
		"Error: Unmatched input.\n"
	};
	private void yy_error (int code,boolean fatal) {
		java.lang.System.out.print(yy_error_string[code]);
		java.lang.System.out.flush();
		if (fatal) {
			throw new Error("Fatal Error.\n");
		}
	}
	private int[][] unpackFromString(int size1, int size2, String st) {
		int colonIndex = -1;
		String lengthString;
		int sequenceLength = 0;
		int sequenceInteger = 0;

		int commaIndex;
		String workString;

		int res[][] = new int[size1][size2];
		for (int i= 0; i < size1; i++) {
			for (int j= 0; j < size2; j++) {
				if (sequenceLength != 0) {
					res[i][j] = sequenceInteger;
					sequenceLength--;
					continue;
				}
				commaIndex = st.indexOf(',');
				workString = (commaIndex==-1) ? st :
					st.substring(0, commaIndex);
				st = st.substring(commaIndex+1);
				colonIndex = workString.indexOf(':');
				if (colonIndex == -1) {
					res[i][j]=Integer.parseInt(workString);
					continue;
				}
				lengthString =
					workString.substring(colonIndex+1);
				sequenceLength=Integer.parseInt(lengthString);
				workString=workString.substring(0,colonIndex);
				sequenceInteger=Integer.parseInt(workString);
				res[i][j] = sequenceInteger;
				sequenceLength--;
			}
		}
		return res;
	}
	private int yy_acpt[] = {
		/* 0 */ YY_NO_ANCHOR,
		/* 1 */ YY_NO_ANCHOR,
		/* 2 */ YY_NO_ANCHOR,
		/* 3 */ YY_NO_ANCHOR,
		/* 4 */ YY_NO_ANCHOR,
		/* 5 */ YY_NO_ANCHOR,
		/* 6 */ YY_NO_ANCHOR,
		/* 7 */ YY_NO_ANCHOR,
		/* 8 */ YY_NO_ANCHOR,
		/* 9 */ YY_NO_ANCHOR,
		/* 10 */ YY_NO_ANCHOR,
		/* 11 */ YY_NO_ANCHOR,
		/* 12 */ YY_NO_ANCHOR,
		/* 13 */ YY_NO_ANCHOR,
		/* 14 */ YY_NO_ANCHOR,
		/* 15 */ YY_NO_ANCHOR,
		/* 16 */ YY_NO_ANCHOR,
		/* 17 */ YY_NO_ANCHOR,
		/* 18 */ YY_NO_ANCHOR,
		/* 19 */ YY_NO_ANCHOR,
		/* 20 */ YY_NO_ANCHOR,
		/* 21 */ YY_NO_ANCHOR,
		/* 22 */ YY_NO_ANCHOR,
		/* 23 */ YY_NO_ANCHOR,
		/* 24 */ YY_NO_ANCHOR,
		/* 25 */ YY_NO_ANCHOR,
		/* 26 */ YY_NO_ANCHOR,
		/* 27 */ YY_NO_ANCHOR,
		/* 28 */ YY_NO_ANCHOR,
		/* 29 */ YY_NO_ANCHOR,
		/* 30 */ YY_NO_ANCHOR,
		/* 31 */ YY_NO_ANCHOR,
		/* 32 */ YY_NO_ANCHOR,
		/* 33 */ YY_NO_ANCHOR,
		/* 34 */ YY_NO_ANCHOR,
		/* 35 */ YY_NO_ANCHOR,
		/* 36 */ YY_NO_ANCHOR,
		/* 37 */ YY_NO_ANCHOR,
		/* 38 */ YY_NO_ANCHOR,
		/* 39 */ YY_NO_ANCHOR,
		/* 40 */ YY_NO_ANCHOR,
		/* 41 */ YY_NO_ANCHOR,
		/* 42 */ YY_NO_ANCHOR,
		/* 43 */ YY_NO_ANCHOR,
		/* 44 */ YY_NO_ANCHOR,
		/* 45 */ YY_NO_ANCHOR,
		/* 46 */ YY_NO_ANCHOR,
		/* 47 */ YY_NO_ANCHOR,
		/* 48 */ YY_NOT_ACCEPT,
		/* 49 */ YY_NO_ANCHOR,
		/* 50 */ YY_NO_ANCHOR,
		/* 51 */ YY_NO_ANCHOR,
		/* 52 */ YY_NO_ANCHOR,
		/* 53 */ YY_NO_ANCHOR,
		/* 54 */ YY_NO_ANCHOR,
		/* 55 */ YY_NO_ANCHOR,
		/* 56 */ YY_NO_ANCHOR,
		/* 57 */ YY_NO_ANCHOR,
		/* 58 */ YY_NO_ANCHOR,
		/* 59 */ YY_NO_ANCHOR,
		/* 60 */ YY_NO_ANCHOR,
		/* 61 */ YY_NO_ANCHOR,
		/* 62 */ YY_NO_ANCHOR,
		/* 63 */ YY_START,
		/* 64 */ YY_NO_ANCHOR,
		/* 65 */ YY_NO_ANCHOR,
		/* 66 */ YY_NO_ANCHOR,
		/* 67 */ YY_NO_ANCHOR,
		/* 68 */ YY_NOT_ACCEPT,
		/* 69 */ YY_NO_ANCHOR,
		/* 70 */ YY_NO_ANCHOR,
		/* 71 */ YY_NO_ANCHOR,
		/* 72 */ YY_NOT_ACCEPT,
		/* 73 */ YY_NO_ANCHOR,
		/* 74 */ YY_NO_ANCHOR,
		/* 75 */ YY_NO_ANCHOR,
		/* 76 */ YY_NOT_ACCEPT,
		/* 77 */ YY_NO_ANCHOR,
		/* 78 */ YY_NOT_ACCEPT,
		/* 79 */ YY_NO_ANCHOR,
		/* 80 */ YY_NOT_ACCEPT,
		/* 81 */ YY_NO_ANCHOR,
		/* 82 */ YY_NO_ANCHOR,
		/* 83 */ YY_NO_ANCHOR,
		/* 84 */ YY_NO_ANCHOR,
		/* 85 */ YY_NO_ANCHOR,
		/* 86 */ YY_NO_ANCHOR,
		/* 87 */ YY_NO_ANCHOR,
		/* 88 */ YY_NO_ANCHOR,
		/* 89 */ YY_NO_ANCHOR,
		/* 90 */ YY_NO_ANCHOR,
		/* 91 */ YY_NO_ANCHOR,
		/* 92 */ YY_NO_ANCHOR,
		/* 93 */ YY_NO_ANCHOR,
		/* 94 */ YY_NO_ANCHOR,
		/* 95 */ YY_NO_ANCHOR,
		/* 96 */ YY_NO_ANCHOR,
		/* 97 */ YY_NO_ANCHOR,
		/* 98 */ YY_NO_ANCHOR,
		/* 99 */ YY_NO_ANCHOR,
		/* 100 */ YY_NO_ANCHOR,
		/* 101 */ YY_NO_ANCHOR,
		/* 102 */ YY_NO_ANCHOR,
		/* 103 */ YY_NO_ANCHOR,
		/* 104 */ YY_NO_ANCHOR,
		/* 105 */ YY_NO_ANCHOR,
		/* 106 */ YY_NO_ANCHOR,
		/* 107 */ YY_NO_ANCHOR,
		/* 108 */ YY_NO_ANCHOR,
		/* 109 */ YY_NO_ANCHOR,
		/* 110 */ YY_NO_ANCHOR,
		/* 111 */ YY_NO_ANCHOR,
		/* 112 */ YY_NO_ANCHOR,
		/* 113 */ YY_NO_ANCHOR,
		/* 114 */ YY_NO_ANCHOR
	};
	private int yy_cmap[] = unpackFromString(1,130,
"50:8,40,48,41,50,49,47,50:18,48,50,42,50:3,18,50,4,5,13,11,1,10,12,14,46:10" +
",2,3,16,15,17,50:2,51:2,44,51:23,6,43,7,50,52,50,21,36,33,25,23,26,51,29,30" +
",51,37,31,51,24,27,39,51,22,35,34,32,20,28,51,38,51,8,19,9,50:2,45,0")[0];

	private int yy_rmap[] = unpackFromString(1,115,
"0,1:2,2,1:11,3,1,4,5,1:2,6,7,1:8,8:17,9,1:6,10,1:9,11,12,13,14,15,16,17,18," +
"19,20,21,22,23,24,25,20,8,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,4" +
"2,43,44,45,46,47,48,49,50,51,8,52,53,54,55,56,57")[0];

	private int yy_nxt[][] = unpackFromString(58,53,
"1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,105,108,109,110,67,11" +
"1,71,112,108,75,113,108:2,77,108,114,108:3,22,23,24,25,108,1,65,-1,22,25:2," +
"108,25,-1:68,26,-1:50,27,-1:54,28,-1,29,-1:50,30,-1:57,108,79,108:18,-1:4,1" +
"08,-1,81,-1:4,108,81,-1:40,22,-1:7,22,-1:24,108:20,-1:4,108,-1,81,-1:4,108," +
"81,1,49:12,69,73,49:26,23,49:3,1,49,-1,49:5,-1:43,56,-1:55,65,-1:50,63,-1:2" +
"8,108:7,31,108:12,-1:4,108,-1,81,-1:4,108,81,1,52:40,53,54,55,52,1,52:7,-1:" +
"14,50,-1:84,78,-1:26,108:6,32,108:13,-1:4,108,-1,81,-1:4,108,81,1,57:23,58," +
"57:9,59,57:6,60,61,62,57,66,70,76,74:2,57:3,-1:13,51,-1:82,62,-1:3,76,80:2," +
"-1:23,108:4,33,108,34,108:13,-1:4,108,-1,81,-1:4,108,81,-1:41,80,-1:31,108:" +
"7,35,108,90,108:8,91,108,-1:4,108,-1,81,-1:4,108,81,-1:46,64,-1:26,108:2,36" +
",108:17,-1:4,108,-1,81,-1:4,108,81,-1:20,108:2,92,108:17,-1:4,108,-1,81,-1:" +
"4,108,81,-1:20,108:5,37,108:14,-1:4,108,-1,81,-1:4,108,81,-1:20,108:15,93,1" +
"08:4,-1:4,108,-1,81,-1:4,108,81,-1:20,108:11,38,108:8,-1:4,108,-1,81,-1:4,1" +
"08,81,-1:20,108:2,39,108:17,-1:4,108,-1,81,-1:4,108,81,-1:20,108:4,94,108:1" +
"5,-1:4,108,-1,81,-1:4,108,81,-1:20,108:10,95,108:9,-1:4,108,-1,81,-1:4,108," +
"81,-1:20,108:14,40,108:5,-1:4,108,-1,81,-1:4,108,81,-1:20,108:3,96,108:16,-" +
"1:4,108,-1,81,-1:4,108,81,-1:20,108:19,97,-1:4,108,-1,81,-1:4,108,81,-1:20," +
"108,98,108:18,-1:4,108,-1,81,-1:4,108,81,-1:20,108:3,41,108:16,-1:4,108,-1," +
"81,-1:4,108,81,-1:20,108:13,99,108:6,-1:4,108,-1,81,-1:4,108,81,-1:20,108:1" +
"1,100,108:8,-1:4,108,-1,81,-1:4,108,81,-1:20,108:4,42,108:15,-1:4,108,-1,81" +
",-1:4,108,81,-1:20,108:3,43,108:16,-1:4,108,-1,81,-1:4,108,81,-1:20,108:18," +
"44,108,-1:4,108,-1,81,-1:4,108,81,-1:20,108:14,102,108:5,-1:4,108,-1,81,-1:" +
"4,108,81,-1:20,108:3,45,108:16,-1:4,108,-1,81,-1:4,108,81,-1:20,108:17,46,1" +
"08:2,-1:4,108,-1,81,-1:4,108,81,-1:20,108:10,103,108:9,-1:4,108,-1,81,-1:4," +
"108,81,-1:20,108:7,104,108:12,-1:4,108,-1,81,-1:4,108,81,-1:20,108:4,47,108" +
":15,-1:4,108,-1,81,-1:4,108,81,-1:20,108:2,82,108:17,-1:4,108,-1,81,-1:4,10" +
"8,81,-1:20,108:3,107,108:16,-1:4,108,-1,81,-1:4,108,81,-1:20,108,101,108:18" +
",-1:4,108,-1,81,-1:4,108,81,-1:20,108:4,83,108:6,84,108:8,-1:4,108,-1,81,-1" +
":4,108,81,-1:20,108:10,85,108:9,-1:4,108,-1,81,-1:4,108,81,-1:20,108:7,86,1" +
"08:4,87,108:7,-1:4,108,-1,81,-1:4,108,81,-1:20,108:9,88,108:10,-1:4,108,-1," +
"81,-1:4,108,81,-1:20,108:3,89,108:16,-1:4,108,-1,81,-1:4,108,81,-1:20,108:2" +
",106,108:17,-1:4,108,-1,81,-1:4,108,81");

	public java_cup.runtime.Symbol nextToken ()
		throws java.io.IOException {
		int yy_lookahead;
		int yy_anchor = YY_NO_ANCHOR;
		int yy_state = yy_state_dtrans[yy_lexical_state];
		int yy_next_state = YY_NO_STATE;
		int yy_last_accept_state = YY_NO_STATE;
		boolean yy_initial = true;
		int yy_this_accept;

		yy_mark_start();
		yy_this_accept = yy_acpt[yy_state];
		if (YY_NOT_ACCEPT != yy_this_accept) {
			yy_last_accept_state = yy_state;
			yy_mark_end();
		}
		while (true) {
			if (yy_initial && yy_at_bol) yy_lookahead = YY_BOL;
			else yy_lookahead = yy_advance();
			yy_next_state = YY_F;
			yy_next_state = yy_nxt[yy_rmap[yy_state]][yy_cmap[yy_lookahead]];
			if (YY_EOF == yy_lookahead && true == yy_initial) {

   {
     // controlla se e' rimasto aperto qualche commento
     if (commentDepth!=0) {
        err(yychar-1,"Commento non chiuso.");
        return null;
     }
     else return tok(sym.EOF, null);
   }
			}
			if (YY_F != yy_next_state) {
				yy_state = yy_next_state;
				yy_initial = false;
				yy_this_accept = yy_acpt[yy_state];
				if (YY_NOT_ACCEPT != yy_this_accept) {
					yy_last_accept_state = yy_state;
					yy_mark_end();
				}
			}
			else {
				if (YY_NO_STATE == yy_last_accept_state) {
					throw (new Error("Lexical Error: Unmatched Input."));
				}
				else {
					yy_anchor = yy_acpt[yy_last_accept_state];
					if (0 != (YY_END & yy_anchor)) {
						yy_move_end();
					}
					yy_to_mark();
					switch (yy_last_accept_state) {
					case 0:
						{ return tok(sym.INT,temp.valueOf(yytext()));}
					case -2:
						break;
					case 1:
						
					case -3:
						break;
					case 2:
						{return tok(sym.COMMA, null);}
					case -4:
						break;
					case 3:
						{return tok(sym.COLON, null);}
					case -5:
						break;
					case 4: