2 #define YYERROR goto yyerrlab
3 #define YYACCEPT return(0)
4 #define YYABORT return(1)
5 #define yyclearin yychar = -1
6 #define yyerrok yyerrflag = 0
12 static const char* yytoknames[1]; /* for debugging */
13 static const char* yystates[1]; /* for debugging */
16 /* parser for yacc output */
18 #define yynerrs yyarg->yynerrs
19 #define yyerrflag yyarg->yyerrflag
20 #define yyval yyarg->yyval
21 #define yylval yyarg->yylval
23 int yynerrs = 0; /* number of errors */
24 int yyerrflag = 0; /* error recovery flag */
27 extern int fprint(int, char*, ...);
28 extern int sprint(char*, char*, ...);
35 if(yyc > 0 && yyc <= sizeof(yytoknames)/sizeof(yytoknames[0]))
37 return yytoknames[yyc-1];
38 sprint(x, "<%d>", yyc);
47 if(yys >= 0 && yys < sizeof(yystates)/sizeof(yystates[0]))
50 sprint(x, "<%d>\n", yys);
56 yylex1(struct Yyarg *yyarg)
66 yychar = yylex(yyarg);
74 if(yychar < sizeof(yytok1)/sizeof(yytok1[0])) {
78 if(yychar >= YYPRIVATE)
79 if(yychar < YYPRIVATE+sizeof(yytok2)/sizeof(yytok2[0])) {
80 c = yytok2[yychar-YYPRIVATE];
83 for(t3p=yytok3;; t3p+=2) {
96 c = yytok2[1]; /* unknown char */
98 fprint(2, "lex %.4lux %s\n", yychar, yytokname(c));
104 yyparse(struct Yyarg *yyarg)
113 } yys[YYMAXDEPTH], *yyp, *yypt;
115 int yyj, yym, yystate, yyn, yyg;
118 YYSTYPE save1, save2;
152 /* put a state and value onto the stack */
154 fprint(2, "char %s in %s", yytokname(yychar), yystatname(yystate));
157 if(yyp >= &yys[YYMAXDEPTH]) {
158 yyerror("yacc stack overflow");
165 yyn = yypact[yystate];
167 goto yydefault; /* simple state */
170 yychar = yylex1(yyarg);
175 if(yyn < 0 || yyn >= YYLAST)
178 if(yychk[yyn] == yychar) { /* valid shift */
188 /* default state action */
189 yyn = yydef[yystate];
193 yychar = yylex1(yyarg);
198 /* look through exception table */
199 for(yyxi=yyexca;; yyxi+=2)
200 if(yyxi[0] == -1 && yyxi[1] == yystate)
202 for(yyxi += 2;; yyxi += 2) {
204 if(yyn < 0 || yyn == yychar)
212 /* error ... attempt to resume parsing */
214 case 0: /* brand new error */
215 yyerror("syntax error");
217 fprint(2, "%s", yystatname(yystate));
218 fprint(2, "saw %s\n", yytokname(yychar));
225 case 2: /* incompletely recovered error ... try again */
228 /* find a state where "error" is a legal shift action */
230 yyn = yypact[yyp->yys] + YYERRCODE;
231 if(yyn >= 0 && yyn < YYLAST) {
232 yystate = yyact[yyn]; /* simulate a shift of "error" */
233 if(yychk[yystate] == YYERRCODE)
237 /* the current yyp has no shift onn "error", pop stack */
239 fprint(2, "error recovery pops state %d, uncovers %d\n",
240 yyp->yys, (yyp-1)->yys );
243 /* there is no state on the stack with an error shift ... abort */
246 case 3: /* no shift yet; clobber input char */
248 fprint(2, "error recovery discards %s\n", yytokname(yychar));
249 if(yychar == YYEOFCODE)
252 goto yynewstate; /* try again in the same state */
256 /* reduction by production yyn */
258 fprint(2, "reduce %d in:\n\t%s", yyn, yystatname(yystate));
262 yyval = (yyp+1)->yyv;
265 /* consult goto table to find next state */
268 yyj = yyg + yyp->yys + 1;
270 if(yyj >= YYLAST || yychk[yystate=yyact[yyj]] != -yyn)
271 yystate = yyact[yyg];
275 goto yystack; /* stack new state and value */