9f36c7f497
In case you're wondering, the gcc-2.7.2.1 import uses this to generate code. The size of the generated code is bigger than the entire bison release, making this a saving. The bison doc is pretty good apparently.
335 lines
6.3 KiB
Plaintext
335 lines
6.3 KiB
Plaintext
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extern int timeclock;
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int yyerror; /* Yyerror and yycost are set by guards. */
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int yycost; /* If yyerror is set to a nonzero value by a */
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/* guard, the reduction with which the guard */
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/* is associated is not performed, and the */
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/* error recovery mechanism is invoked. */
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/* Yycost indicates the cost of performing */
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/* the reduction given the attributes of the */
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/* symbols. */
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/* YYMAXDEPTH indicates the size of the parser's state and value */
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/* stacks. */
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#ifndef YYMAXDEPTH
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#define YYMAXDEPTH 500
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#endif
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/* YYMAXRULES must be at least as large as the number of rules that */
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/* could be placed in the rule queue. That number could be determined */
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/* from the grammar and the size of the stack, but, as yet, it is not. */
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#ifndef YYMAXRULES
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#define YYMAXRULES 100
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#endif
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#ifndef YYMAXBACKUP
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#define YYMAXBACKUP 100
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#endif
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short yyss[YYMAXDEPTH]; /* the state stack */
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YYSTYPE yyvs[YYMAXDEPTH]; /* the semantic value stack */
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YYLTYPE yyls[YYMAXDEPTH]; /* the location stack */
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short yyrq[YYMAXRULES]; /* the rule queue */
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int yychar; /* the lookahead symbol */
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YYSTYPE yylval; /* the semantic value of the */
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/* lookahead symbol */
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YYSTYPE yytval; /* the semantic value for the state */
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/* at the top of the state stack. */
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YYSTYPE yyval; /* the variable used to return */
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/* semantic values from the action */
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/* routines */
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YYLTYPE yylloc; /* location data for the lookahead */
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/* symbol */
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YYLTYPE yytloc; /* location data for the state at the */
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/* top of the state stack */
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int yynunlexed;
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short yyunchar[YYMAXBACKUP];
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YYSTYPE yyunval[YYMAXBACKUP];
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YYLTYPE yyunloc[YYMAXBACKUP];
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short *yygssp; /* a pointer to the top of the state */
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/* stack; only set during error */
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/* recovery. */
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YYSTYPE *yygvsp; /* a pointer to the top of the value */
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/* stack; only set during error */
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/* recovery. */
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YYLTYPE *yyglsp; /* a pointer to the top of the */
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/* location stack; only set during */
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/* error recovery. */
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/* Yyget is an interface between the parser and the lexical analyzer. */
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/* It is costly to provide such an interface, but it avoids requiring */
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/* the lexical analyzer to be able to back up the scan. */
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yyget()
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{
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if (yynunlexed > 0)
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{
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yynunlexed--;
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yychar = yyunchar[yynunlexed];
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yylval = yyunval[yynunlexed];
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yylloc = yyunloc[yynunlexed];
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}
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else if (yychar <= 0)
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yychar = 0;
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else
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{
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yychar = yylex();
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if (yychar < 0)
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yychar = 0;
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else yychar = YYTRANSLATE(yychar);
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}
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}
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yyunlex(chr, val, loc)
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int chr;
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YYSTYPE val;
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YYLTYPE loc;
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{
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yyunchar[yynunlexed] = chr;
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yyunval[yynunlexed] = val;
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yyunloc[yynunlexed] = loc;
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yynunlexed++;
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}
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yyrestore(first, last)
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register short *first;
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register short *last;
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{
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register short *ssp;
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register short *rp;
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register int symbol;
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register int state;
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register int tvalsaved;
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ssp = yygssp;
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yyunlex(yychar, yylval, yylloc);
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tvalsaved = 0;
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while (first != last)
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{
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symbol = yystos[*ssp];
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if (symbol < YYNTBASE)
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{
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yyunlex(symbol, yytval, yytloc);
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tvalsaved = 1;
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ssp--;
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}
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ssp--;
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if (first == yyrq)
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first = yyrq + YYMAXRULES;
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first--;
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for (rp = yyrhs + yyprhs[*first]; symbol = *rp; rp++)
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{
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if (symbol < YYNTBASE)
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state = yytable[yypact[*ssp] + symbol];
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else
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{
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state = yypgoto[symbol - YYNTBASE] + *ssp;
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if (state >= 0 && state <= YYLAST && yycheck[state] == *ssp)
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state = yytable[state];
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else
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state = yydefgoto[symbol - YYNTBASE];
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}
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*++ssp = state;
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}
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}
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if ( ! tvalsaved && ssp > yyss)
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{
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yyunlex(yystos[*ssp], yytval, yytloc);
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ssp--;
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}
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yygssp = ssp;
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}
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int
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yyparse()
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{
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register int yystate;
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register int yyn;
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register short *yyssp;
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register short *yyrq0;
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register short *yyptr;
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register YYSTYPE *yyvsp;
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int yylen;
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YYLTYPE *yylsp;
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short *yyrq1;
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short *yyrq2;
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yystate = 0;
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yyssp = yyss - 1;
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yyvsp = yyvs - 1;
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yylsp = yyls - 1;
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yyrq0 = yyrq;
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yyrq1 = yyrq0;
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yyrq2 = yyrq0;
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yychar = yylex();
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if (yychar < 0)
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yychar = 0;
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else yychar = YYTRANSLATE(yychar);
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yynewstate:
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if (yyssp >= yyss + YYMAXDEPTH - 1)
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{
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yyabort("Parser Stack Overflow");
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YYABORT;
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}
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*++yyssp = yystate;
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yyresume:
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yyn = yypact[yystate];
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if (yyn == YYFLAG)
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goto yydefault;
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yyn += yychar;
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if (yyn < 0 || yyn > YYLAST || yycheck[yyn] != yychar)
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goto yydefault;
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yyn = yytable[yyn];
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if (yyn < 0)
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{
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yyn = -yyn;
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goto yyreduce;
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}
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else if (yyn == 0)
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goto yyerrlab;
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yystate = yyn;
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yyptr = yyrq2;
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while (yyptr != yyrq1)
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{
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yyn = *yyptr++;
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yylen = yyr2[yyn];
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yyvsp -= yylen;
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yylsp -= yylen;
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yyguard(yyn, yyvsp, yylsp);
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if (yyerror)
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goto yysemerr;
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yyaction(yyn, yyvsp, yylsp);
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*++yyvsp = yyval;
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yylsp++;
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if (yylen == 0)
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{
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yylsp->timestamp = timeclock;
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yylsp->first_line = yytloc.first_line;
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yylsp->first_column = yytloc.first_column;
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yylsp->last_line = (yylsp-1)->last_line;
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yylsp->last_column = (yylsp-1)->last_column;
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yylsp->text = 0;
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}
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else
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{
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yylsp->last_line = (yylsp+yylen-1)->last_line;
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yylsp->last_column = (yylsp+yylen-1)->last_column;
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}
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if (yyptr == yyrq + YYMAXRULES)
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yyptr = yyrq;
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}
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if (yystate == YYFINAL)
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YYACCEPT;
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yyrq2 = yyptr;
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yyrq1 = yyrq0;
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*++yyvsp = yytval;
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*++yylsp = yytloc;
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yytval = yylval;
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yytloc = yylloc;
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yyget();
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goto yynewstate;
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yydefault:
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yyn = yydefact[yystate];
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if (yyn == 0)
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goto yyerrlab;
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yyreduce:
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*yyrq0++ = yyn;
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if (yyrq0 == yyrq + YYMAXRULES)
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yyrq0 = yyrq;
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if (yyrq0 == yyrq2)
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{
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yyabort("Parser Rule Queue Overflow");
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YYABORT;
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}
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yyssp -= yyr2[yyn];
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yyn = yyr1[yyn];
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yystate = yypgoto[yyn - YYNTBASE] + *yyssp;
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if (yystate >= 0 && yystate <= YYLAST && yycheck[yystate] == *yyssp)
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yystate = yytable[yystate];
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else
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yystate = yydefgoto[yyn - YYNTBASE];
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goto yynewstate;
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yysemerr:
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*--yyptr = yyn;
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yyrq2 = yyptr;
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yyvsp += yyr2[yyn];
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yyerrlab:
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yygssp = yyssp;
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yygvsp = yyvsp;
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yyglsp = yylsp;
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yyrestore(yyrq0, yyrq2);
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yyrecover();
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yystate = *yygssp;
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yyssp = yygssp;
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yyvsp = yygvsp;
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yyrq0 = yyrq;
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yyrq1 = yyrq0;
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yyrq2 = yyrq0;
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goto yyresume;
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}
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$
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