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.
22 * Note that this file is also #included in madly.c, to allow compilation
23 * of a second parser, Perl_madparse, that is identical to Perl_yyparse,
24 * but which includes extra code for dumping the parse tree.
25 * This is controlled by the PERL_IN_MADLY_C define.
29 #define PERL_IN_PERLY_C
32 typedef unsigned char yytype_uint8;
33 typedef signed char yytype_int8;
34 typedef unsigned short int yytype_uint16;
35 typedef short int yytype_int16;
36 typedef signed char yysigned_char;
38 /* YYINITDEPTH -- initial size of the parser's stacks. */
39 #define YYINITDEPTH 200
54 /* contains all the parser state tables; auto-generated from perly.y */
57 # define YYSIZE_T size_t
62 #define YYACCEPT goto yyacceptlab
63 #define YYABORT goto yyabortlab
64 #define YYERROR goto yyerrlab1
66 /* Enable debugging if requested. */
69 # define yydebug (DEBUG_p_TEST)
71 # define YYFPRINTF PerlIO_printf
73 # define YYDPRINTF(Args) \
79 # define YYDSYMPRINTF(Title, Token, Value) \
82 YYFPRINTF (Perl_debug_log, "%s ", Title); \
83 yysymprint (aTHX_ Perl_debug_log, Token, Value); \
84 YYFPRINTF (Perl_debug_log, "\n"); \
88 /*--------------------------------.
89 | Print this symbol on YYOUTPUT. |
90 `--------------------------------*/
93 yysymprint(pTHX_ PerlIO * const yyoutput, int yytype, const YYSTYPE * const yyvaluep)
95 if (yytype < YYNTOKENS) {
96 YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
98 YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
100 YYFPRINTF (yyoutput, "0x%"UVxf, (UV)yyvaluep->ival);
104 YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);
106 YYFPRINTF (yyoutput, ")");
111 * print the top 8 items on the parse stack.
115 yy_stack_print (pTHX_ const yy_parser *parser)
117 const yy_stack_frame *ps, *min;
119 min = parser->ps - 8 + 1;
120 if (min <= parser->stack)
121 min = parser->stack + 1;
123 PerlIO_printf(Perl_debug_log, "\nindex:");
124 for (ps = min; ps <= parser->ps; ps++)
125 PerlIO_printf(Perl_debug_log, " %8d", (int)(ps - parser->stack));
127 PerlIO_printf(Perl_debug_log, "\nstate:");
128 for (ps = min; ps <= parser->ps; ps++)
129 PerlIO_printf(Perl_debug_log, " %8d", ps->state);
131 PerlIO_printf(Perl_debug_log, "\ntoken:");
132 for (ps = min; ps <= parser->ps; ps++)
133 PerlIO_printf(Perl_debug_log, " %8.8s", ps->name);
135 PerlIO_printf(Perl_debug_log, "\nvalue:");
136 for (ps = min; ps <= parser->ps; ps++) {
137 switch (yy_type_tab[yystos[ps->state]]) {
139 PerlIO_printf(Perl_debug_log, " %8.8s",
141 ? PL_op_name[ps->val.opval->op_type]
145 #ifndef PERL_IN_MADLY_C
146 case toketype_i_tkval:
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 for (yyi = yyprhs[yyrule]; 0 <= yyrhs[yyi]; yyi++)
178 YYFPRINTF (Perl_debug_log, "%s ", yytname [yyrhs[yyi]]);
179 YYFPRINTF (Perl_debug_log, "-> %s\n", yytname [yyr1[yyrule]]);
182 # define YY_REDUCE_PRINT(Rule) \
185 yy_reduce_print (aTHX_ Rule); \
188 #else /* !DEBUGGING */
189 # define YYDPRINTF(Args)
190 # define YYDSYMPRINTF(Title, Token, Value)
191 # define YY_STACK_PRINT(parser)
192 # define YY_REDUCE_PRINT(Rule)
193 #endif /* !DEBUGGING */
195 /* called during cleanup (via SAVEDESTRUCTOR_X) to free any items on the
196 * parse stack, thus avoiding leaks if we die */
199 S_clear_yystack(pTHX_ const yy_parser *parser)
201 yy_stack_frame *ps = parser->ps;
207 YYDPRINTF ((Perl_debug_log, "clearing the parse stack\n"));
209 for (i=0; i< parser->yylen; i++) {
210 SvREFCNT_dec(ps[-i].compcv);
214 /* now free whole the stack, including the just-reduced ops */
216 while (ps > parser->stack) {
217 LEAVE_SCOPE(ps->savestack_ix);
218 if (yy_type_tab[yystos[ps->state]] == toketype_opval
221 if (ps->compcv != PL_compcv) {
222 PL_compcv = ps->compcv;
223 PAD_SET_CUR_NOSAVE(CvPADLIST(PL_compcv), 1);
225 YYDPRINTF ((Perl_debug_log, "(freeing op)\n"));
226 op_free(ps->val.opval);
228 SvREFCNT_dec(ps->compcv);
232 Safefree(parser->stack);
241 #ifdef PERL_IN_MADLY_C
242 Perl_madparse (pTHX_ int gramtype)
244 Perl_yyparse (pTHX_ int gramtype)
252 /* Lookahead token as an internal (translated) token number. */
255 yy_parser *parser; /* the parser object */
256 yy_stack_frame *ps; /* current parser stack frame */
258 #define YYPOPSTACK parser->ps = --ps
259 #define YYPUSHSTACK parser->ps = ++ps
261 /* The variable used to return semantic value and location from the
262 action routines: ie $$. */
265 #ifndef PERL_IN_MADLY_C
268 return madparse(gramtype);
272 YYDPRINTF ((Perl_debug_log, "Starting parse\n"));
276 ENTER; /* force parser state cleanup/restoration before we return */
277 SAVEPPTR(parser->yylval.pval);
278 SAVEINT(parser->yychar);
279 SAVEINT(parser->yyerrstatus);
280 SAVEINT(parser->stack_size);
281 SAVEINT(parser->yylen);
282 SAVEVPTR(parser->stack);
283 SAVEVPTR(parser->ps);
285 /* initialise state for this parse */
286 parser->yychar = gramtype;
287 parser->yyerrstatus = 0;
288 parser->stack_size = YYINITDEPTH;
290 Newx(parser->stack, YYINITDEPTH, yy_stack_frame);
291 ps = parser->ps = parser->stack;
293 SAVEDESTRUCTOR_X(S_clear_yystack, parser);
295 /*------------------------------------------------------------.
296 | yynewstate -- Push a new state, which is found in yystate. |
297 `------------------------------------------------------------*/
302 YYDPRINTF ((Perl_debug_log, "Entering state %d\n", yystate));
307 size_t size = ps - parser->stack + 1;
309 /* grow the stack? We always leave 1 spare slot,
310 * in case of a '' -> 'foo' reduction */
312 if (size >= (size_t)parser->stack_size - 1) {
313 /* this will croak on insufficient memory */
314 parser->stack_size *= 2;
315 Renew(parser->stack, parser->stack_size, yy_stack_frame);
316 ps = parser->ps = parser->stack + size -1;
318 YYDPRINTF((Perl_debug_log,
319 "parser stack size increased to %lu frames\n",
320 (unsigned long int)parser->stack_size));
324 /* Do appropriate processing given the current state. */
325 /* Read a lookahead token if we need one and don't already have one. */
327 /* First try to decide what to do without reference to lookahead token. */
329 yyn = yypact[yystate];
330 if (yyn == YYPACT_NINF)
333 /* Not known => get a lookahead token if don't already have one. */
335 /* YYCHAR is either YYEMPTY or YYEOF or a valid lookahead symbol. */
336 if (parser->yychar == YYEMPTY) {
337 YYDPRINTF ((Perl_debug_log, "Reading a token: "));
338 #ifdef PERL_IN_MADLY_C
339 parser->yychar = PL_madskills ? madlex() : yylex();
341 parser->yychar = yylex();
345 if (parser->yychar >= 0 && parser->yychar < 255) {
346 parser->yychar = NATIVE_TO_ASCII(parser->yychar);
351 if (parser->yychar <= YYEOF) {
352 parser->yychar = yytoken = YYEOF;
353 YYDPRINTF ((Perl_debug_log, "Now at end of input.\n"));
356 yytoken = YYTRANSLATE (parser->yychar);
357 YYDSYMPRINTF ("Next token is", yytoken, &parser->yylval);
360 /* If the proper action on seeing token YYTOKEN is to reduce or to
361 detect an error, take that action. */
363 if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken)
367 if (yyn == 0 || yyn == YYTABLE_NINF)
376 /* Shift the lookahead token. */
377 YYDPRINTF ((Perl_debug_log, "Shifting token %s, ", yytname[yytoken]));
379 /* Discard the token being shifted unless it is eof. */
380 if (parser->yychar != YYEOF)
381 parser->yychar = YYEMPTY;
385 ps->val = parser->yylval;
386 ps->compcv = (CV*)SvREFCNT_inc(PL_compcv);
387 ps->savestack_ix = PL_savestack_ix;
389 ps->name = (const char *)(yytname[yytoken]);
392 /* Count tokens shifted since error; after three, turn off error
394 if (parser->yyerrstatus)
395 parser->yyerrstatus--;
400 /*-----------------------------------------------------------.
401 | yydefault -- do the default action for the current state. |
402 `-----------------------------------------------------------*/
404 yyn = yydefact[yystate];
410 /*-----------------------------.
411 | yyreduce -- Do a reduction. |
412 `-----------------------------*/
414 /* yyn is the number of a rule to reduce with. */
415 parser->yylen = yyr2[yyn];
417 /* If YYLEN is nonzero, implement the default value of the action:
420 Otherwise, the following line sets YYVAL to garbage.
421 This behavior is undocumented and Bison
422 users should not rely upon it. Assigning to YYVAL
423 unconditionally makes the parser a bit smaller, and it avoids a
424 GCC warning that YYVAL may be used uninitialized. */
425 yyval = ps[1-parser->yylen].val;
427 YY_STACK_PRINT(parser);
428 YY_REDUCE_PRINT (yyn);
433 #define dep() deprecate("\"do\" to call subroutines")
435 #ifdef PERL_IN_MADLY_C
436 # define IVAL(i) (i)->tk_lval.ival
437 # define PVAL(p) (p)->tk_lval.pval
438 # define TOKEN_GETMAD(a,b,c) token_getmad((a),(b),(c))
439 # define TOKEN_FREE(a) token_free(a)
440 # define OP_GETMAD(a,b,c) op_getmad((a),(b),(c))
441 # define IF_MAD(a,b) (a)
447 # define TOKEN_GETMAD(a,b,c)
448 # define TOKEN_FREE(a)
449 # define OP_GETMAD(a,b,c)
450 # define IF_MAD(a,b) (b)
455 /* contains all the rule actions; auto-generated from perly.y */
462 for (i=0; i< parser->yylen; i++) {
463 SvREFCNT_dec(ps[-i].compcv);
467 parser->ps = ps -= (parser->yylen-1);
469 /* Now shift the result of the reduction. Determine what state
470 that goes to, based on the state we popped back to and the rule
471 number reduced by. */
474 ps->compcv = (CV*)SvREFCNT_inc(PL_compcv);
475 ps->savestack_ix = PL_savestack_ix;
477 ps->name = (const char *)(yytname [yyr1[yyn]]);
482 yystate = yypgoto[yyn - YYNTOKENS] + ps[-1].state;
483 if (0 <= yystate && yystate <= YYLAST && yycheck[yystate] == ps[-1].state)
484 yystate = yytable[yystate];
486 yystate = yydefgoto[yyn - YYNTOKENS];
492 /*------------------------------------.
493 | yyerrlab -- here on detecting error |
494 `------------------------------------*/
496 /* If not already recovering from an error, report this error. */
497 if (!parser->yyerrstatus) {
498 yyerror ("syntax error");
502 if (parser->yyerrstatus == 3) {
503 /* If just tried and failed to reuse lookahead token after an
504 error, discard it. */
506 /* Return failure if at end of input. */
507 if (parser->yychar == YYEOF) {
508 /* Pop the error token. */
509 SvREFCNT_dec(ps->compcv);
511 /* Pop the rest of the stack. */
512 while (ps > parser->stack) {
513 YYDSYMPRINTF ("Error: popping", yystos[ps->state], &ps->val);
514 LEAVE_SCOPE(ps->savestack_ix);
515 if (yy_type_tab[yystos[ps->state]] == toketype_opval
518 YYDPRINTF ((Perl_debug_log, "(freeing op)\n"));
519 if (ps->compcv != PL_compcv) {
520 PL_compcv = ps->compcv;
521 PAD_SET_CUR_NOSAVE(CvPADLIST(PL_compcv), 1);
523 op_free(ps->val.opval);
525 SvREFCNT_dec(ps->compcv);
531 YYDSYMPRINTF ("Error: discarding", yytoken, &parser->yylval);
532 parser->yychar = YYEMPTY;
536 /* Else will try to reuse lookahead token after shifting the error
541 /*----------------------------------------------------.
542 | yyerrlab1 -- error raised explicitly by an action. |
543 `----------------------------------------------------*/
545 parser->yyerrstatus = 3; /* Each real token shifted decrements this. */
548 yyn = yypact[yystate];
549 if (yyn != YYPACT_NINF) {
551 if (0 <= yyn && yyn <= YYLAST && yycheck[yyn] == YYTERROR) {
558 /* Pop the current state because it cannot handle the error token. */
559 if (ps == parser->stack)
562 YYDSYMPRINTF ("Error: popping", yystos[ps->state], &ps->val);
563 LEAVE_SCOPE(ps->savestack_ix);
564 if (yy_type_tab[yystos[ps->state]] == toketype_opval && ps->val.opval) {
565 YYDPRINTF ((Perl_debug_log, "(freeing op)\n"));
566 if (ps->compcv != PL_compcv) {
567 PL_compcv = ps->compcv;
568 PAD_SET_CUR_NOSAVE(CvPADLIST(PL_compcv), 1);
570 op_free(ps->val.opval);
572 SvREFCNT_dec(ps->compcv);
576 YY_STACK_PRINT(parser);
582 YYDPRINTF ((Perl_debug_log, "Shifting error token, "));
586 ps->val = parser->yylval;
587 ps->compcv = (CV*)SvREFCNT_inc(PL_compcv);
588 ps->savestack_ix = PL_savestack_ix;
596 /*-------------------------------------.
597 | yyacceptlab -- YYACCEPT comes here. |
598 `-------------------------------------*/
601 for (ps=parser->ps; ps > parser->stack; ps--) {
602 SvREFCNT_dec(ps->compcv);
604 parser->ps = parser->stack; /* disable cleanup */
607 /*-----------------------------------.
608 | yyabortlab -- YYABORT comes here. |
609 `-----------------------------------*/
615 LEAVE; /* force parser stack cleanup before we return */
621 * c-indentation-style: bsd
623 * indent-tabs-mode: nil
626 * ex: set ts=8 sts=4 sw=4 et: