| 1 | /* perly.c |
| 2 | * |
| 3 | * Copyright (c) 2004, 2005, 2006, 2007, by Larry Wall and others |
| 4 | * |
| 5 | * You may distribute under the terms of either the GNU General Public |
| 6 | * License or the Artistic License, as specified in the README file. |
| 7 | * |
| 8 | * Note that this file was originally generated as an output from |
| 9 | * GNU bison version 1.875, but now the code is statically maintained |
| 10 | * and edited; the bits that are dependent on perly.y are now |
| 11 | * #included from the files perly.tab and perly.act. |
| 12 | * |
| 13 | * Here is an important copyright statement from the original, generated |
| 14 | * file: |
| 15 | * |
| 16 | * As a special exception, when this file is copied by Bison into a |
| 17 | * Bison output file, you may use that output file without |
| 18 | * restriction. This special exception was added by the Free |
| 19 | * Software Foundation in version 1.24 of Bison. |
| 20 | * |
| 21 | * Note that this file is also #included in madly.c, to allow compilation |
| 22 | * of a second parser, Perl_madparse, that is identical to Perl_yyparse, |
| 23 | * but which includes extra code for dumping the parse tree. |
| 24 | * This is controlled by the PERL_IN_MADLY_C define. |
| 25 | */ |
| 26 | |
| 27 | #include "EXTERN.h" |
| 28 | #define PERL_IN_PERLY_C |
| 29 | #include "perl.h" |
| 30 | |
| 31 | typedef unsigned char yytype_uint8; |
| 32 | typedef signed char yytype_int8; |
| 33 | typedef unsigned short int yytype_uint16; |
| 34 | typedef short int yytype_int16; |
| 35 | typedef signed char yysigned_char; |
| 36 | |
| 37 | #ifdef DEBUGGING |
| 38 | # define YYDEBUG 1 |
| 39 | #else |
| 40 | # define YYDEBUG 0 |
| 41 | #endif |
| 42 | |
| 43 | /* contains all the parser state tables; auto-generated from perly.y */ |
| 44 | #include "perly.tab" |
| 45 | |
| 46 | # define YYSIZE_T size_t |
| 47 | |
| 48 | #define YYEOF 0 |
| 49 | #define YYTERROR 1 |
| 50 | |
| 51 | #define YYACCEPT goto yyacceptlab |
| 52 | #define YYABORT goto yyabortlab |
| 53 | #define YYERROR goto yyerrlab1 |
| 54 | |
| 55 | /* Enable debugging if requested. */ |
| 56 | #ifdef DEBUGGING |
| 57 | |
| 58 | # define yydebug (DEBUG_p_TEST) |
| 59 | |
| 60 | # define YYFPRINTF PerlIO_printf |
| 61 | |
| 62 | # define YYDPRINTF(Args) \ |
| 63 | do { \ |
| 64 | if (yydebug) \ |
| 65 | YYFPRINTF Args; \ |
| 66 | } while (0) |
| 67 | |
| 68 | # define YYDSYMPRINTF(Title, Token, Value) \ |
| 69 | do { \ |
| 70 | if (yydebug) { \ |
| 71 | YYFPRINTF (Perl_debug_log, "%s ", Title); \ |
| 72 | yysymprint (aTHX_ Perl_debug_log, Token, Value); \ |
| 73 | YYFPRINTF (Perl_debug_log, "\n"); \ |
| 74 | } \ |
| 75 | } while (0) |
| 76 | |
| 77 | /*--------------------------------. |
| 78 | | Print this symbol on YYOUTPUT. | |
| 79 | `--------------------------------*/ |
| 80 | |
| 81 | static void |
| 82 | yysymprint(pTHX_ PerlIO * const yyoutput, int yytype, const YYSTYPE * const yyvaluep) |
| 83 | { |
| 84 | if (yytype < YYNTOKENS) { |
| 85 | YYFPRINTF (yyoutput, "token %s (", yytname[yytype]); |
| 86 | # ifdef YYPRINT |
| 87 | YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep); |
| 88 | # else |
| 89 | YYFPRINTF (yyoutput, "0x%"UVxf, (UV)yyvaluep->ival); |
| 90 | # endif |
| 91 | } |
| 92 | else |
| 93 | YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]); |
| 94 | |
| 95 | YYFPRINTF (yyoutput, ")"); |
| 96 | } |
| 97 | |
| 98 | |
| 99 | /* yy_stack_print() |
| 100 | * print the top 8 items on the parse stack. |
| 101 | */ |
| 102 | |
| 103 | static void |
| 104 | yy_stack_print (pTHX_ const yy_parser *parser) |
| 105 | { |
| 106 | const yy_stack_frame *ps, *min; |
| 107 | |
| 108 | min = parser->ps - 8 + 1; |
| 109 | if (min <= parser->stack) |
| 110 | min = parser->stack + 1; |
| 111 | |
| 112 | PerlIO_printf(Perl_debug_log, "\nindex:"); |
| 113 | for (ps = min; ps <= parser->ps; ps++) |
| 114 | PerlIO_printf(Perl_debug_log, " %8d", (int)(ps - parser->stack)); |
| 115 | |
| 116 | PerlIO_printf(Perl_debug_log, "\nstate:"); |
| 117 | for (ps = min; ps <= parser->ps; ps++) |
| 118 | PerlIO_printf(Perl_debug_log, " %8d", ps->state); |
| 119 | |
| 120 | PerlIO_printf(Perl_debug_log, "\ntoken:"); |
| 121 | for (ps = min; ps <= parser->ps; ps++) |
| 122 | PerlIO_printf(Perl_debug_log, " %8.8s", ps->name); |
| 123 | |
| 124 | PerlIO_printf(Perl_debug_log, "\nvalue:"); |
| 125 | for (ps = min; ps <= parser->ps; ps++) { |
| 126 | switch (yy_type_tab[yystos[ps->state]]) { |
| 127 | case toketype_opval: |
| 128 | PerlIO_printf(Perl_debug_log, " %8.8s", |
| 129 | ps->val.opval |
| 130 | ? PL_op_name[ps->val.opval->op_type] |
| 131 | : "(Nullop)" |
| 132 | ); |
| 133 | break; |
| 134 | #ifndef PERL_IN_MADLY_C |
| 135 | case toketype_p_tkval: |
| 136 | PerlIO_printf(Perl_debug_log, " %8.8s", |
| 137 | ps->val.pval ? ps->val.pval : "(NULL)"); |
| 138 | break; |
| 139 | |
| 140 | case toketype_i_tkval: |
| 141 | #endif |
| 142 | case toketype_ival: |
| 143 | PerlIO_printf(Perl_debug_log, " %8"IVdf, (IV)ps->val.ival); |
| 144 | break; |
| 145 | default: |
| 146 | PerlIO_printf(Perl_debug_log, " %8"UVxf, (UV)ps->val.ival); |
| 147 | } |
| 148 | } |
| 149 | PerlIO_printf(Perl_debug_log, "\n\n"); |
| 150 | } |
| 151 | |
| 152 | # define YY_STACK_PRINT(parser) \ |
| 153 | do { \ |
| 154 | if (yydebug && DEBUG_v_TEST) \ |
| 155 | yy_stack_print (aTHX_ parser); \ |
| 156 | } while (0) |
| 157 | |
| 158 | |
| 159 | /*------------------------------------------------. |
| 160 | | Report that the YYRULE is going to be reduced. | |
| 161 | `------------------------------------------------*/ |
| 162 | |
| 163 | static void |
| 164 | yy_reduce_print (pTHX_ int yyrule) |
| 165 | { |
| 166 | int yyi; |
| 167 | const unsigned int yylineno = yyrline[yyrule]; |
| 168 | YYFPRINTF (Perl_debug_log, "Reducing stack by rule %d (line %u), ", |
| 169 | yyrule - 1, yylineno); |
| 170 | /* Print the symbols being reduced, and their result. */ |
| 171 | for (yyi = yyprhs[yyrule]; 0 <= yyrhs[yyi]; yyi++) |
| 172 | YYFPRINTF (Perl_debug_log, "%s ", yytname [yyrhs[yyi]]); |
| 173 | YYFPRINTF (Perl_debug_log, "-> %s\n", yytname [yyr1[yyrule]]); |
| 174 | } |
| 175 | |
| 176 | # define YY_REDUCE_PRINT(Rule) \ |
| 177 | do { \ |
| 178 | if (yydebug) \ |
| 179 | yy_reduce_print (aTHX_ Rule); \ |
| 180 | } while (0) |
| 181 | |
| 182 | #else /* !DEBUGGING */ |
| 183 | # define YYDPRINTF(Args) |
| 184 | # define YYDSYMPRINTF(Title, Token, Value) |
| 185 | # define YY_STACK_PRINT(parser) |
| 186 | # define YY_REDUCE_PRINT(Rule) |
| 187 | #endif /* !DEBUGGING */ |
| 188 | |
| 189 | /* called during cleanup (via SAVEDESTRUCTOR_X) to free any items on the |
| 190 | * parse stack, thus avoiding leaks if we die */ |
| 191 | |
| 192 | static void |
| 193 | S_clear_yystack(pTHX_ const yy_parser *parser) |
| 194 | { |
| 195 | yy_stack_frame *ps = parser->ps; |
| 196 | int i; |
| 197 | |
| 198 | if (!parser->stack || ps == parser->stack) |
| 199 | return; |
| 200 | |
| 201 | YYDPRINTF ((Perl_debug_log, "clearing the parse stack\n")); |
| 202 | |
| 203 | /* Freeing ops on the stack, and the op_latefree / op_latefreed / |
| 204 | * op_attached flags: |
| 205 | * |
| 206 | * When we pop tokens off the stack during error recovery, or when |
| 207 | * we pop all the tokens off the stack after a die during a shift or |
| 208 | * reduce (i.e. Perl_croak somewhere in yylex() or in one of the |
| 209 | * newFOO() functions), then it's possible that some of these tokens are |
| 210 | * of type opval, pointing to an OP. All these ops are orphans; each is |
| 211 | * its own miniature subtree that has not yet been attached to a |
| 212 | * larger tree. In this case, we should clearly free the op (making |
| 213 | * sure, for each op we free that we have PL_comppad pointing to the |
| 214 | * right place for freeing any SVs attached to the op in threaded |
| 215 | * builds. |
| 216 | * |
| 217 | * However, there is a particular problem if we die in newFOO() called |
| 218 | * by a reducing action; e.g. |
| 219 | * |
| 220 | * foo : bar baz boz |
| 221 | * { $$ = newFOO($1,$2,$3) } |
| 222 | * |
| 223 | * where |
| 224 | * OP *newFOO { ....; if (...) croak; .... } |
| 225 | * |
| 226 | * In this case, when we come to clean bar baz and boz off the stack, |
| 227 | * we don't know whether newFOO() has already: |
| 228 | * * freed them |
| 229 | * * left them as is |
| 230 | * * attached them to part of a larger tree |
| 231 | * * attached them to PL_compcv |
| 232 | * * attached them to PL_compcv then freed it (as in BEGIN {die } ) |
| 233 | * |
| 234 | * To get round this problem, we set the flag op_latefree on every op |
| 235 | * that gets pushed onto the parser stack. If op_free() sees this |
| 236 | * flag, it clears the op and frees any children,, but *doesn't* free |
| 237 | * the op itself; instead it sets the op_latefreed flag. This means |
| 238 | * that we can safely call op_free() multiple times on each stack op. |
| 239 | * So, when clearing the stack, we first, for each op that was being |
| 240 | * reduced, call op_free with op_latefree=1. This ensures that all ops |
| 241 | * hanging off these op are freed, but the reducing ops themselces are |
| 242 | * just undefed. Then we set op_latefreed=0 on *all* ops on the stack |
| 243 | * and free them. A little thought should convince you that this |
| 244 | * two-part approach to the reducing ops should handle the first three |
| 245 | * cases above safely. |
| 246 | * |
| 247 | * In the case of attaching to PL_compcv (currently just newATTRSUB |
| 248 | * does this), then we set the op_attached flag on the op that has |
| 249 | * been so attached, then avoid doing the final op_free during |
| 250 | * cleanup, on the assumption that it will happen (or has already |
| 251 | * happened) when PL_compcv is freed. |
| 252 | * |
| 253 | * Note this is fairly fragile mechanism. A more robust approach |
| 254 | * would be to use two of these flag bits as 2-bit reference count |
| 255 | * field for each op, indicating whether it is pointed to from: |
| 256 | * * a parent op |
| 257 | * * the parser stack |
| 258 | * * a CV |
| 259 | * but this would involve reworking all code (core and external) that |
| 260 | * manipulate op trees. |
| 261 | * |
| 262 | * XXX DAPM 17/1/07 I've decided its too fragile for now, and so have |
| 263 | * disabled it */ |
| 264 | |
| 265 | #define DISABLE_STACK_FREE |
| 266 | |
| 267 | |
| 268 | #ifdef DISABLE_STACK_FREE |
| 269 | ps -= parser->yylen; |
| 270 | PERL_UNUSED_VAR(i); |
| 271 | #else |
| 272 | /* clear any reducing ops (1st pass) */ |
| 273 | |
| 274 | for (i=0; i< parser->yylen; i++) { |
| 275 | LEAVE_SCOPE(ps[-i].savestack_ix); |
| 276 | if (yy_type_tab[yystos[ps[-i].state]] == toketype_opval |
| 277 | && ps[-i].val.opval) { |
| 278 | if ( ! (ps[-i].val.opval->op_attached |
| 279 | && !ps[-i].val.opval->op_latefreed)) |
| 280 | { |
| 281 | if (ps[-i].comppad != PL_comppad) { |
| 282 | PAD_RESTORE_LOCAL(ps[-i].comppad); |
| 283 | } |
| 284 | op_free(ps[-i].val.opval); |
| 285 | } |
| 286 | } |
| 287 | } |
| 288 | #endif |
| 289 | |
| 290 | /* now free whole the stack, including the just-reduced ops */ |
| 291 | |
| 292 | while (ps > parser->stack) { |
| 293 | LEAVE_SCOPE(ps->savestack_ix); |
| 294 | if (yy_type_tab[yystos[ps->state]] == toketype_opval |
| 295 | && ps->val.opval) |
| 296 | { |
| 297 | if (ps->comppad != PL_comppad) { |
| 298 | PAD_RESTORE_LOCAL(ps->comppad); |
| 299 | } |
| 300 | YYDPRINTF ((Perl_debug_log, "(freeing op)\n")); |
| 301 | #ifndef DISABLE_STACK_FREE |
| 302 | ps->val.opval->op_latefree = 0; |
| 303 | if (!(ps->val.opval->op_attached && !ps->val.opval->op_latefreed)) |
| 304 | #endif |
| 305 | op_free(ps->val.opval); |
| 306 | } |
| 307 | ps--; |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | |
| 312 | /*----------. |
| 313 | | yyparse. | |
| 314 | `----------*/ |
| 315 | |
| 316 | int |
| 317 | #ifdef PERL_IN_MADLY_C |
| 318 | Perl_madparse (pTHX) |
| 319 | #else |
| 320 | Perl_yyparse (pTHX) |
| 321 | #endif |
| 322 | { |
| 323 | dVAR; |
| 324 | register int yystate; |
| 325 | register int yyn; |
| 326 | int yyresult; |
| 327 | |
| 328 | /* Lookahead token as an internal (translated) token number. */ |
| 329 | int yytoken = 0; |
| 330 | |
| 331 | register yy_parser *parser; /* the parser object */ |
| 332 | register yy_stack_frame *ps; /* current parser stack frame */ |
| 333 | |
| 334 | #define YYPOPSTACK parser->ps = --ps |
| 335 | #define YYPUSHSTACK parser->ps = ++ps |
| 336 | |
| 337 | /* The variable used to return semantic value and location from the |
| 338 | action routines: ie $$. */ |
| 339 | YYSTYPE yyval; |
| 340 | |
| 341 | #ifndef PERL_IN_MADLY_C |
| 342 | # ifdef PERL_MAD |
| 343 | if (PL_madskills) |
| 344 | return madparse(); |
| 345 | # endif |
| 346 | #endif |
| 347 | |
| 348 | YYDPRINTF ((Perl_debug_log, "Starting parse\n")); |
| 349 | |
| 350 | parser = PL_parser; |
| 351 | ps = parser->ps; |
| 352 | |
| 353 | ENTER; /* force parser stack cleanup before we return */ |
| 354 | SAVEDESTRUCTOR_X(S_clear_yystack, parser); |
| 355 | |
| 356 | /*------------------------------------------------------------. |
| 357 | | yynewstate -- Push a new state, which is found in yystate. | |
| 358 | `------------------------------------------------------------*/ |
| 359 | yynewstate: |
| 360 | |
| 361 | yystate = ps->state; |
| 362 | |
| 363 | YYDPRINTF ((Perl_debug_log, "Entering state %d\n", yystate)); |
| 364 | |
| 365 | #ifndef DISABLE_STACK_FREE |
| 366 | if (yy_type_tab[yystos[yystate]] == toketype_opval && ps->val.opval) { |
| 367 | ps->val.opval->op_latefree = 1; |
| 368 | ps->val.opval->op_latefreed = 0; |
| 369 | } |
| 370 | #endif |
| 371 | |
| 372 | parser->yylen = 0; |
| 373 | |
| 374 | { |
| 375 | size_t size = ps - parser->stack + 1; |
| 376 | |
| 377 | /* grow the stack? We always leave 1 spare slot, |
| 378 | * in case of a '' -> 'foo' reduction */ |
| 379 | |
| 380 | if (size >= (size_t)parser->stack_size - 1) { |
| 381 | /* this will croak on insufficient memory */ |
| 382 | parser->stack_size *= 2; |
| 383 | Renew(parser->stack, parser->stack_size, yy_stack_frame); |
| 384 | ps = parser->ps = parser->stack + size -1; |
| 385 | |
| 386 | YYDPRINTF((Perl_debug_log, |
| 387 | "parser stack size increased to %lu frames\n", |
| 388 | (unsigned long int)parser->stack_size)); |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | /* Do appropriate processing given the current state. */ |
| 393 | /* Read a lookahead token if we need one and don't already have one. */ |
| 394 | |
| 395 | /* First try to decide what to do without reference to lookahead token. */ |
| 396 | |
| 397 | yyn = yypact[yystate]; |
| 398 | if (yyn == YYPACT_NINF) |
| 399 | goto yydefault; |
| 400 | |
| 401 | /* Not known => get a lookahead token if don't already have one. */ |
| 402 | |
| 403 | /* YYCHAR is either YYEMPTY or YYEOF or a valid lookahead symbol. */ |
| 404 | if (parser->yychar == YYEMPTY) { |
| 405 | YYDPRINTF ((Perl_debug_log, "Reading a token: ")); |
| 406 | #ifdef PERL_IN_MADLY_C |
| 407 | parser->yychar = PL_madskills ? madlex() : yylex(); |
| 408 | #else |
| 409 | parser->yychar = yylex(); |
| 410 | #endif |
| 411 | |
| 412 | # ifdef EBCDIC |
| 413 | if (parser->yychar >= 0 && parser->yychar < 255) { |
| 414 | parser->yychar = NATIVE_TO_ASCII(parser->yychar); |
| 415 | } |
| 416 | # endif |
| 417 | } |
| 418 | |
| 419 | if (parser->yychar <= YYEOF) { |
| 420 | parser->yychar = yytoken = YYEOF; |
| 421 | YYDPRINTF ((Perl_debug_log, "Now at end of input.\n")); |
| 422 | } |
| 423 | else { |
| 424 | yytoken = YYTRANSLATE (parser->yychar); |
| 425 | YYDSYMPRINTF ("Next token is", yytoken, &parser->yylval); |
| 426 | } |
| 427 | |
| 428 | /* If the proper action on seeing token YYTOKEN is to reduce or to |
| 429 | detect an error, take that action. */ |
| 430 | yyn += yytoken; |
| 431 | if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken) |
| 432 | goto yydefault; |
| 433 | yyn = yytable[yyn]; |
| 434 | if (yyn <= 0) { |
| 435 | if (yyn == 0 || yyn == YYTABLE_NINF) |
| 436 | goto yyerrlab; |
| 437 | yyn = -yyn; |
| 438 | goto yyreduce; |
| 439 | } |
| 440 | |
| 441 | if (yyn == YYFINAL) |
| 442 | YYACCEPT; |
| 443 | |
| 444 | /* Shift the lookahead token. */ |
| 445 | YYDPRINTF ((Perl_debug_log, "Shifting token %s, ", yytname[yytoken])); |
| 446 | |
| 447 | /* Discard the token being shifted unless it is eof. */ |
| 448 | if (parser->yychar != YYEOF) |
| 449 | parser->yychar = YYEMPTY; |
| 450 | |
| 451 | YYPUSHSTACK; |
| 452 | ps->state = yyn; |
| 453 | ps->val = parser->yylval; |
| 454 | ps->comppad = PL_comppad; |
| 455 | ps->savestack_ix = PL_savestack_ix; |
| 456 | #ifdef DEBUGGING |
| 457 | ps->name = (const char *)(yytname[yytoken]); |
| 458 | #endif |
| 459 | |
| 460 | /* Count tokens shifted since error; after three, turn off error |
| 461 | status. */ |
| 462 | if (parser->yyerrstatus) |
| 463 | parser->yyerrstatus--; |
| 464 | |
| 465 | goto yynewstate; |
| 466 | |
| 467 | |
| 468 | /*-----------------------------------------------------------. |
| 469 | | yydefault -- do the default action for the current state. | |
| 470 | `-----------------------------------------------------------*/ |
| 471 | yydefault: |
| 472 | yyn = yydefact[yystate]; |
| 473 | if (yyn == 0) |
| 474 | goto yyerrlab; |
| 475 | goto yyreduce; |
| 476 | |
| 477 | |
| 478 | /*-----------------------------. |
| 479 | | yyreduce -- Do a reduction. | |
| 480 | `-----------------------------*/ |
| 481 | yyreduce: |
| 482 | /* yyn is the number of a rule to reduce with. */ |
| 483 | parser->yylen = yyr2[yyn]; |
| 484 | |
| 485 | /* If YYLEN is nonzero, implement the default value of the action: |
| 486 | "$$ = $1". |
| 487 | |
| 488 | Otherwise, the following line sets YYVAL to garbage. |
| 489 | This behavior is undocumented and Bison |
| 490 | users should not rely upon it. Assigning to YYVAL |
| 491 | unconditionally makes the parser a bit smaller, and it avoids a |
| 492 | GCC warning that YYVAL may be used uninitialized. */ |
| 493 | yyval = ps[1-parser->yylen].val; |
| 494 | |
| 495 | YY_STACK_PRINT(parser); |
| 496 | YY_REDUCE_PRINT (yyn); |
| 497 | |
| 498 | switch (yyn) { |
| 499 | |
| 500 | |
| 501 | #define dep() deprecate("\"do\" to call subroutines") |
| 502 | |
| 503 | #ifdef PERL_IN_MADLY_C |
| 504 | # define IVAL(i) (i)->tk_lval.ival |
| 505 | # define PVAL(p) (p)->tk_lval.pval |
| 506 | # define TOKEN_GETMAD(a,b,c) token_getmad((a),(b),(c)) |
| 507 | # define TOKEN_FREE(a) token_free(a) |
| 508 | # define OP_GETMAD(a,b,c) op_getmad((a),(b),(c)) |
| 509 | # define IF_MAD(a,b) (a) |
| 510 | # define DO_MAD(a) a |
| 511 | # define MAD |
| 512 | #else |
| 513 | # define IVAL(i) (i) |
| 514 | # define PVAL(p) (p) |
| 515 | # define TOKEN_GETMAD(a,b,c) |
| 516 | # define TOKEN_FREE(a) |
| 517 | # define OP_GETMAD(a,b,c) |
| 518 | # define IF_MAD(a,b) (b) |
| 519 | # define DO_MAD(a) |
| 520 | # undef MAD |
| 521 | #endif |
| 522 | |
| 523 | /* contains all the rule actions; auto-generated from perly.y */ |
| 524 | #include "perly.act" |
| 525 | |
| 526 | } |
| 527 | |
| 528 | #ifndef DISABLE_STACK_FREE |
| 529 | /* any just-reduced ops with the op_latefreed flag cleared need to be |
| 530 | * freed; the rest need the flag resetting */ |
| 531 | { |
| 532 | int i; |
| 533 | for (i=0; i< parser->yylen; i++) { |
| 534 | if (yy_type_tab[yystos[ps[-i].state]] == toketype_opval |
| 535 | && ps[-i].val.opval) |
| 536 | { |
| 537 | ps[-i].val.opval->op_latefree = 0; |
| 538 | if (ps[-i].val.opval->op_latefreed) |
| 539 | op_free(ps[-i].val.opval); |
| 540 | } |
| 541 | } |
| 542 | } |
| 543 | #endif |
| 544 | |
| 545 | parser->ps = ps -= (parser->yylen-1); |
| 546 | |
| 547 | /* Now shift the result of the reduction. Determine what state |
| 548 | that goes to, based on the state we popped back to and the rule |
| 549 | number reduced by. */ |
| 550 | |
| 551 | ps->val = yyval; |
| 552 | ps->comppad = PL_comppad; |
| 553 | ps->savestack_ix = PL_savestack_ix; |
| 554 | #ifdef DEBUGGING |
| 555 | ps->name = (const char *)(yytname [yyr1[yyn]]); |
| 556 | #endif |
| 557 | |
| 558 | yyn = yyr1[yyn]; |
| 559 | |
| 560 | yystate = yypgoto[yyn - YYNTOKENS] + ps[-1].state; |
| 561 | if (0 <= yystate && yystate <= YYLAST && yycheck[yystate] == ps[-1].state) |
| 562 | yystate = yytable[yystate]; |
| 563 | else |
| 564 | yystate = yydefgoto[yyn - YYNTOKENS]; |
| 565 | ps->state = yystate; |
| 566 | |
| 567 | goto yynewstate; |
| 568 | |
| 569 | |
| 570 | /*------------------------------------. |
| 571 | | yyerrlab -- here on detecting error | |
| 572 | `------------------------------------*/ |
| 573 | yyerrlab: |
| 574 | /* If not already recovering from an error, report this error. */ |
| 575 | if (!parser->yyerrstatus) { |
| 576 | yyerror ("syntax error"); |
| 577 | } |
| 578 | |
| 579 | |
| 580 | if (parser->yyerrstatus == 3) { |
| 581 | /* If just tried and failed to reuse lookahead token after an |
| 582 | error, discard it. */ |
| 583 | |
| 584 | /* Return failure if at end of input. */ |
| 585 | if (parser->yychar == YYEOF) { |
| 586 | /* Pop the error token. */ |
| 587 | YYPOPSTACK; |
| 588 | /* Pop the rest of the stack. */ |
| 589 | while (ps > parser->stack) { |
| 590 | YYDSYMPRINTF ("Error: popping", yystos[ps->state], &ps->val); |
| 591 | LEAVE_SCOPE(ps->savestack_ix); |
| 592 | if (yy_type_tab[yystos[ps->state]] == toketype_opval |
| 593 | && ps->val.opval) |
| 594 | { |
| 595 | YYDPRINTF ((Perl_debug_log, "(freeing op)\n")); |
| 596 | if (ps->comppad != PL_comppad) { |
| 597 | PAD_RESTORE_LOCAL(ps->comppad); |
| 598 | } |
| 599 | ps->val.opval->op_latefree = 0; |
| 600 | op_free(ps->val.opval); |
| 601 | } |
| 602 | YYPOPSTACK; |
| 603 | } |
| 604 | YYABORT; |
| 605 | } |
| 606 | |
| 607 | YYDSYMPRINTF ("Error: discarding", yytoken, &parser->yylval); |
| 608 | parser->yychar = YYEMPTY; |
| 609 | |
| 610 | } |
| 611 | |
| 612 | /* Else will try to reuse lookahead token after shifting the error |
| 613 | token. */ |
| 614 | goto yyerrlab1; |
| 615 | |
| 616 | |
| 617 | /*----------------------------------------------------. |
| 618 | | yyerrlab1 -- error raised explicitly by an action. | |
| 619 | `----------------------------------------------------*/ |
| 620 | yyerrlab1: |
| 621 | parser->yyerrstatus = 3; /* Each real token shifted decrements this. */ |
| 622 | |
| 623 | for (;;) { |
| 624 | yyn = yypact[yystate]; |
| 625 | if (yyn != YYPACT_NINF) { |
| 626 | yyn += YYTERROR; |
| 627 | if (0 <= yyn && yyn <= YYLAST && yycheck[yyn] == YYTERROR) { |
| 628 | yyn = yytable[yyn]; |
| 629 | if (0 < yyn) |
| 630 | break; |
| 631 | } |
| 632 | } |
| 633 | |
| 634 | /* Pop the current state because it cannot handle the error token. */ |
| 635 | if (ps == parser->stack) |
| 636 | YYABORT; |
| 637 | |
| 638 | YYDSYMPRINTF ("Error: popping", yystos[ps->state], &ps->val); |
| 639 | LEAVE_SCOPE(ps->savestack_ix); |
| 640 | if (yy_type_tab[yystos[ps->state]] == toketype_opval && ps->val.opval) { |
| 641 | YYDPRINTF ((Perl_debug_log, "(freeing op)\n")); |
| 642 | if (ps->comppad != PL_comppad) { |
| 643 | PAD_RESTORE_LOCAL(ps->comppad); |
| 644 | } |
| 645 | ps->val.opval->op_latefree = 0; |
| 646 | op_free(ps->val.opval); |
| 647 | } |
| 648 | YYPOPSTACK; |
| 649 | yystate = ps->state; |
| 650 | |
| 651 | YY_STACK_PRINT(parser); |
| 652 | } |
| 653 | |
| 654 | if (yyn == YYFINAL) |
| 655 | YYACCEPT; |
| 656 | |
| 657 | YYDPRINTF ((Perl_debug_log, "Shifting error token, ")); |
| 658 | |
| 659 | YYPUSHSTACK; |
| 660 | ps->state = yyn; |
| 661 | ps->val = parser->yylval; |
| 662 | ps->comppad = PL_comppad; |
| 663 | ps->savestack_ix = PL_savestack_ix; |
| 664 | #ifdef DEBUGGING |
| 665 | ps->name ="<err>"; |
| 666 | #endif |
| 667 | |
| 668 | goto yynewstate; |
| 669 | |
| 670 | |
| 671 | /*-------------------------------------. |
| 672 | | yyacceptlab -- YYACCEPT comes here. | |
| 673 | `-------------------------------------*/ |
| 674 | yyacceptlab: |
| 675 | yyresult = 0; |
| 676 | parser->ps = parser->stack; /* disable cleanup */ |
| 677 | goto yyreturn; |
| 678 | |
| 679 | /*-----------------------------------. |
| 680 | | yyabortlab -- YYABORT comes here. | |
| 681 | `-----------------------------------*/ |
| 682 | yyabortlab: |
| 683 | yyresult = 1; |
| 684 | goto yyreturn; |
| 685 | |
| 686 | yyreturn: |
| 687 | LEAVE; /* force parser stack cleanup before we return */ |
| 688 | return yyresult; |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * Local variables: |
| 693 | * c-indentation-style: bsd |
| 694 | * c-basic-offset: 4 |
| 695 | * indent-tabs-mode: t |
| 696 | * End: |
| 697 | * |
| 698 | * ex: set ts=8 sts=4 sw=4 noet: |
| 699 | */ |