3 * Copyright (c) 2004, 2005, 2006, 2007, 2008,
4 * 2009, 2010, 2011 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
9 * Note that this file was originally generated as an output from
10 * GNU bison version 1.875, but now the code is statically maintained
11 * and edited; the bits that are dependent on perly.y are now
12 * #included from the files perly.tab and perly.act.
14 * Here is an important copyright statement from the original, generated
17 * As a special exception, when this file is copied by Bison into a
18 * Bison output file, you may use that output file without
19 * restriction. This special exception was added by the Free
20 * Software Foundation in version 1.24 of Bison.
25 #define PERL_IN_PERLY_C
30 typedef unsigned char yytype_uint8;
31 typedef signed char yytype_int8;
32 typedef unsigned short int yytype_uint16;
33 typedef short int yytype_int16;
34 typedef signed char yysigned_char;
36 /* YYINITDEPTH -- initial size of the parser's stacks. */
37 #define YYINITDEPTH 200
53 # define YY_NULLPTR NULL
56 /* contains all the parser state tables; auto-generated from perly.y */
59 # define YYSIZE_T size_t
64 #define YYACCEPT goto yyacceptlab
65 #define YYABORT goto yyabortlab
66 #define YYERROR goto yyerrlab1
68 /* Enable debugging if requested. */
71 # define yydebug (DEBUG_p_TEST)
73 # define YYFPRINTF PerlIO_printf
75 # define YYDPRINTF(Args) \
81 # define YYDSYMPRINTF(Title, Token, Value) \
84 YYFPRINTF (Perl_debug_log, "%s ", Title); \
85 yysymprint (aTHX_ Perl_debug_log, Token, Value); \
86 YYFPRINTF (Perl_debug_log, "\n"); \
90 /*--------------------------------.
91 | Print this symbol on YYOUTPUT. |
92 `--------------------------------*/
95 yysymprint(pTHX_ PerlIO * const yyoutput, int yytype, const YYSTYPE * const yyvaluep)
98 if (yytype < YYNTOKENS) {
99 YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
101 YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
103 YYFPRINTF (yyoutput, "0x%"UVxf, (UV)yyvaluep->ival);
107 YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);
109 YYFPRINTF (yyoutput, ")");
114 * print the top 8 items on the parse stack.
118 yy_stack_print (pTHX_ const yy_parser *parser)
120 const yy_stack_frame *ps, *min;
122 min = parser->ps - 8 + 1;
123 if (min <= parser->stack)
124 min = parser->stack + 1;
126 PerlIO_printf(Perl_debug_log, "\nindex:");
127 for (ps = min; ps <= parser->ps; ps++)
128 PerlIO_printf(Perl_debug_log, " %8d", (int)(ps - parser->stack));
130 PerlIO_printf(Perl_debug_log, "\nstate:");
131 for (ps = min; ps <= parser->ps; ps++)
132 PerlIO_printf(Perl_debug_log, " %8d", ps->state);
134 PerlIO_printf(Perl_debug_log, "\ntoken:");
135 for (ps = min; ps <= parser->ps; ps++)
136 PerlIO_printf(Perl_debug_log, " %8.8s", ps->name);
138 PerlIO_printf(Perl_debug_log, "\nvalue:");
139 for (ps = min; ps <= parser->ps; ps++) {
140 switch (yy_type_tab[yystos[ps->state]]) {
142 PerlIO_printf(Perl_debug_log, " %8.8s",
144 ? PL_op_name[ps->val.opval->op_type]
149 PerlIO_printf(Perl_debug_log, " %8"IVdf, (IV)ps->val.ival);
152 PerlIO_printf(Perl_debug_log, " %8"UVxf, (UV)ps->val.ival);
155 PerlIO_printf(Perl_debug_log, "\n\n");
158 # define YY_STACK_PRINT(parser) \
160 if (yydebug && DEBUG_v_TEST) \
161 yy_stack_print (aTHX_ parser); \
165 /*------------------------------------------------.
166 | Report that the YYRULE is going to be reduced. |
167 `------------------------------------------------*/
170 yy_reduce_print (pTHX_ int yyrule)
173 const unsigned int yylineno = yyrline[yyrule];
174 YYFPRINTF (Perl_debug_log, "Reducing stack by rule %d (line %u), ",
175 yyrule - 1, yylineno);
176 /* Print the symbols being reduced, and their result. */
177 #if PERL_BISON_VERSION >= 30000 /* 3.0+ */
178 for (yyi = 0; yyi < yyr2[yyrule]; yyi++)
179 YYFPRINTF (Perl_debug_log, "%s ",
180 yytname [yystos[(PL_parser->ps)[yyi + 1 - yyr2[yyrule]].state]]);
182 for (yyi = yyprhs[yyrule]; 0 <= yyrhs[yyi]; yyi++)
183 YYFPRINTF (Perl_debug_log, "%s ", yytname [yyrhs[yyi]]);
185 YYFPRINTF (Perl_debug_log, "-> %s\n", yytname [yyr1[yyrule]]);
188 # define YY_REDUCE_PRINT(Rule) \
191 yy_reduce_print (aTHX_ Rule); \
194 #else /* !DEBUGGING */
195 # define YYDPRINTF(Args)
196 # define YYDSYMPRINTF(Title, Token, Value)
197 # define YY_STACK_PRINT(parser)
198 # define YY_REDUCE_PRINT(Rule)
199 #endif /* !DEBUGGING */
201 /* called during cleanup (via SAVEDESTRUCTOR_X) to free any items on the
202 * parse stack, thus avoiding leaks if we die */
205 S_clear_yystack(pTHX_ const yy_parser *parser)
207 yy_stack_frame *ps = parser->ps;
213 YYDPRINTF ((Perl_debug_log, "clearing the parse stack\n"));
215 for (i=0; i< parser->yylen; i++) {
216 SvREFCNT_dec(ps[-i].compcv);
220 /* now free whole the stack, including the just-reduced ops */
222 while (ps > parser->stack) {
223 LEAVE_SCOPE(ps->savestack_ix);
224 if (yy_type_tab[yystos[ps->state]] == toketype_opval
227 if (ps->compcv && (ps->compcv != PL_compcv)) {
228 PL_compcv = ps->compcv;
229 PAD_SET_CUR_NOSAVE(CvPADLIST(PL_compcv), 1);
230 PL_comppad_name = PadlistNAMES(CvPADLIST(PL_compcv));
232 YYDPRINTF ((Perl_debug_log, "(freeing op)\n"));
233 op_free(ps->val.opval);
235 SvREFCNT_dec(ps->compcv);
239 Safefree(parser->stack);
248 Perl_yyparse (pTHX_ int gramtype)
255 /* Lookahead token as an internal (translated) token number. */
258 yy_parser *parser; /* the parser object */
259 yy_stack_frame *ps; /* current parser stack frame */
261 #define YYPOPSTACK parser->ps = --ps
262 #define YYPUSHSTACK parser->ps = ++ps
264 /* The variable used to return semantic value and location from the
265 action routines: ie $$. */
268 YYDPRINTF ((Perl_debug_log, "Starting parse\n"));
272 ENTER; /* force parser state cleanup/restoration before we return */
273 SAVEPPTR(parser->yylval.pval);
274 SAVEINT(parser->yychar);
275 SAVEINT(parser->yyerrstatus);
276 SAVEINT(parser->stack_size);
277 SAVEINT(parser->yylen);
278 SAVEVPTR(parser->stack);
279 SAVEVPTR(parser->ps);
281 /* initialise state for this parse */
282 parser->yychar = gramtype;
283 parser->yyerrstatus = 0;
284 parser->stack_size = YYINITDEPTH;
286 Newx(parser->stack, YYINITDEPTH, yy_stack_frame);
287 ps = parser->ps = parser->stack;
289 SAVEDESTRUCTOR_X(S_clear_yystack, parser);
291 /*------------------------------------------------------------.
292 | yynewstate -- Push a new state, which is found in yystate. |
293 `------------------------------------------------------------*/
298 YYDPRINTF ((Perl_debug_log, "Entering state %d\n", yystate));
303 size_t size = ps - parser->stack + 1;
305 /* grow the stack? We always leave 1 spare slot,
306 * in case of a '' -> 'foo' reduction */
308 if (size >= (size_t)parser->stack_size - 1) {
309 /* this will croak on insufficient memory */
310 parser->stack_size *= 2;
311 Renew(parser->stack, parser->stack_size, yy_stack_frame);
312 ps = parser->ps = parser->stack + size -1;
314 YYDPRINTF((Perl_debug_log,
315 "parser stack size increased to %lu frames\n",
316 (unsigned long int)parser->stack_size));
320 /* Do appropriate processing given the current state. */
321 /* Read a lookahead token if we need one and don't already have one. */
323 /* First try to decide what to do without reference to lookahead token. */
325 yyn = yypact[yystate];
326 if (yyn == YYPACT_NINF)
329 /* Not known => get a lookahead token if don't already have one. */
331 /* YYCHAR is either YYEMPTY or YYEOF or a valid lookahead symbol. */
332 if (parser->yychar == YYEMPTY) {
333 YYDPRINTF ((Perl_debug_log, "Reading a token:\n"));
334 parser->yychar = yylex();
337 if (parser->yychar <= YYEOF) {
338 parser->yychar = yytoken = YYEOF;
339 YYDPRINTF ((Perl_debug_log, "Now at end of input.\n"));
342 /* perly.tab is shipped based on an ASCII system, so need to index it
343 * with characters translated to ASCII. Although it's not designed for
344 * this purpose, we can use NATIVE_TO_UNI here. It returns its
345 * argument on ASCII platforms, and on EBCDIC translates native to
346 * ascii in the 0-255 range, leaving everything else unchanged. This
347 * jibes with yylex() returning some bare characters in that range, but
348 * all tokens it returns are either 0, or above 255. There could be a
349 * problem if NULs weren't 0, or were ever returned as raw chars by
351 yytoken = YYTRANSLATE (NATIVE_TO_UNI(parser->yychar));
352 YYDSYMPRINTF ("Next token is", yytoken, &parser->yylval);
355 /* If the proper action on seeing token YYTOKEN is to reduce or to
356 detect an error, take that action. */
358 if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken)
362 if (yyn == 0 || yyn == YYTABLE_NINF)
371 /* Shift the lookahead token. */
372 YYDPRINTF ((Perl_debug_log, "Shifting token %s, ", yytname[yytoken]));
374 /* Discard the token being shifted unless it is eof. */
375 if (parser->yychar != YYEOF)
376 parser->yychar = YYEMPTY;
380 ps->val = parser->yylval;
381 ps->compcv = (CV*)SvREFCNT_inc(PL_compcv);
382 ps->savestack_ix = PL_savestack_ix;
384 ps->name = (const char *)(yytname[yytoken]);
387 /* Count tokens shifted since error; after three, turn off error
389 if (parser->yyerrstatus)
390 parser->yyerrstatus--;
395 /*-----------------------------------------------------------.
396 | yydefault -- do the default action for the current state. |
397 `-----------------------------------------------------------*/
399 yyn = yydefact[yystate];
405 /*-----------------------------.
406 | yyreduce -- Do a reduction. |
407 `-----------------------------*/
409 /* yyn is the number of a rule to reduce with. */
410 parser->yylen = yyr2[yyn];
412 /* If YYLEN is nonzero, implement the default value of the action:
415 Otherwise, the following line sets YYVAL to garbage.
416 This behavior is undocumented and Bison
417 users should not rely upon it. Assigning to YYVAL
418 unconditionally makes the parser a bit smaller, and it avoids a
419 GCC warning that YYVAL may be used uninitialized. */
420 yyval = ps[1-parser->yylen].val;
422 YY_STACK_PRINT(parser);
423 YY_REDUCE_PRINT (yyn);
427 /* contains all the rule actions; auto-generated from perly.y */
434 for (i=0; i< parser->yylen; i++) {
435 SvREFCNT_dec(ps[-i].compcv);
439 parser->ps = ps -= (parser->yylen-1);
441 /* Now shift the result of the reduction. Determine what state
442 that goes to, based on the state we popped back to and the rule
443 number reduced by. */
446 ps->compcv = (CV*)SvREFCNT_inc(PL_compcv);
447 ps->savestack_ix = PL_savestack_ix;
449 ps->name = (const char *)(yytname [yyr1[yyn]]);
454 yystate = yypgoto[yyn - YYNTOKENS] + ps[-1].state;
455 if (0 <= yystate && yystate <= YYLAST && yycheck[yystate] == ps[-1].state)
456 yystate = yytable[yystate];
458 yystate = yydefgoto[yyn - YYNTOKENS];
464 /*------------------------------------.
465 | yyerrlab -- here on detecting error |
466 `------------------------------------*/
468 /* If not already recovering from an error, report this error. */
469 if (!parser->yyerrstatus) {
470 yyerror ("syntax error");
474 if (parser->yyerrstatus == 3) {
475 /* If just tried and failed to reuse lookahead token after an
476 error, discard it. */
478 /* Return failure if at end of input. */
479 if (parser->yychar == YYEOF) {
480 /* Pop the error token. */
481 SvREFCNT_dec(ps->compcv);
483 /* Pop the rest of the stack. */
484 while (ps > parser->stack) {
485 YYDSYMPRINTF ("Error: popping", yystos[ps->state], &ps->val);
486 LEAVE_SCOPE(ps->savestack_ix);
487 if (yy_type_tab[yystos[ps->state]] == toketype_opval
490 YYDPRINTF ((Perl_debug_log, "(freeing op)\n"));
491 if (ps->compcv != PL_compcv) {
492 PL_compcv = ps->compcv;
493 PAD_SET_CUR_NOSAVE(CvPADLIST(PL_compcv), 1);
495 op_free(ps->val.opval);
497 SvREFCNT_dec(ps->compcv);
503 YYDSYMPRINTF ("Error: discarding", yytoken, &parser->yylval);
504 parser->yychar = YYEMPTY;
508 /* Else will try to reuse lookahead token after shifting the error
513 /*----------------------------------------------------.
514 | yyerrlab1 -- error raised explicitly by an action. |
515 `----------------------------------------------------*/
517 parser->yyerrstatus = 3; /* Each real token shifted decrements this. */
520 yyn = yypact[yystate];
521 if (yyn != YYPACT_NINF) {
523 if (0 <= yyn && yyn <= YYLAST && yycheck[yyn] == YYTERROR) {
530 /* Pop the current state because it cannot handle the error token. */
531 if (ps == parser->stack)
534 YYDSYMPRINTF ("Error: popping", yystos[ps->state], &ps->val);
535 LEAVE_SCOPE(ps->savestack_ix);
536 if (yy_type_tab[yystos[ps->state]] == toketype_opval && ps->val.opval) {
537 YYDPRINTF ((Perl_debug_log, "(freeing op)\n"));
538 if (ps->compcv != PL_compcv) {
539 PL_compcv = ps->compcv;
540 PAD_SET_CUR_NOSAVE(CvPADLIST(PL_compcv), 1);
542 op_free(ps->val.opval);
544 SvREFCNT_dec(ps->compcv);
548 YY_STACK_PRINT(parser);
554 YYDPRINTF ((Perl_debug_log, "Shifting error token, "));
558 ps->val = parser->yylval;
559 ps->compcv = (CV*)SvREFCNT_inc(PL_compcv);
560 ps->savestack_ix = PL_savestack_ix;
568 /*-------------------------------------.
569 | yyacceptlab -- YYACCEPT comes here. |
570 `-------------------------------------*/
573 for (ps=parser->ps; ps > parser->stack; ps--) {
574 SvREFCNT_dec(ps->compcv);
576 parser->ps = parser->stack; /* disable cleanup */
579 /*-----------------------------------.
580 | yyabortlab -- YYABORT comes here. |
581 `-----------------------------------*/
587 LEAVE; /* force parser stack cleanup before we return */
592 * ex: set ts=8 sts=4 sw=4 et: