5 * One Ring to rule them all, One Ring to find them
7 * [p.v of _The Lord of the Rings_, opening poem]
8 * [p.50 of _The Lord of the Rings_, I/iii: "The Shadow of the Past"]
9 * [p.254 of _The Lord of the Rings_, II/ii: "The Council of Elrond"]
12 /* This file contains functions for executing a regular expression. See
13 * also regcomp.c which funnily enough, contains functions for compiling
14 * a regular expression.
16 * This file is also copied at build time to ext/re/re_exec.c, where
17 * it's built with -DPERL_EXT_RE_BUILD -DPERL_EXT_RE_DEBUG -DPERL_EXT.
18 * This causes the main functions to be compiled under new names and with
19 * debugging support added, which makes "use re 'debug'" work.
22 /* NOTE: this is derived from Henry Spencer's regexp code, and should not
23 * confused with the original package (see point 3 below). Thanks, Henry!
26 /* Additional note: this code is very heavily munged from Henry's version
27 * in places. In some spots I've traded clarity for efficiency, so don't
28 * blame Henry for some of the lack of readability.
31 /* The names of the functions have been changed from regcomp and
32 * regexec to pregcomp and pregexec in order to avoid conflicts
33 * with the POSIX routines of the same names.
36 #ifdef PERL_EXT_RE_BUILD
41 * pregcomp and pregexec -- regsub and regerror are not used in perl
43 * Copyright (c) 1986 by University of Toronto.
44 * Written by Henry Spencer. Not derived from licensed software.
46 * Permission is granted to anyone to use this software for any
47 * purpose on any computer system, and to redistribute it freely,
48 * subject to the following restrictions:
50 * 1. The author is not responsible for the consequences of use of
51 * this software, no matter how awful, even if they arise
54 * 2. The origin of this software must not be misrepresented, either
55 * by explicit claim or by omission.
57 * 3. Altered versions must be plainly marked as such, and must not
58 * be misrepresented as being the original software.
60 **** Alterations to Henry's code are...
62 **** Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
63 **** 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
64 **** by Larry Wall and others
66 **** You may distribute under the terms of either the GNU General Public
67 **** License or the Artistic License, as specified in the README file.
69 * Beware that some of this code is subtly aware of the way operator
70 * precedence is structured in regular expressions. Serious changes in
71 * regular-expression syntax might require a total rethink.
74 #define PERL_IN_REGEXEC_C
75 #undef PERL_IN_XSUB_RE
76 #define PERL_IN_XSUB_RE 1
79 #undef PERL_IN_XSUB_RE
81 #ifdef PERL_IN_XSUB_RE
87 #define RF_tainted 1 /* tainted information used? e.g. locale */
88 #define RF_warned 2 /* warned about big count? */
90 #define RF_utf8 8 /* Pattern contains multibyte chars? */
92 #define UTF_PATTERN ((PL_reg_flags & RF_utf8) != 0)
94 #define RS_init 1 /* eval environment created */
95 #define RS_set 2 /* replsv value is set */
101 /* Valid for non-utf8 strings, non-ANYOFV nodes only: avoids the reginclass
102 * call if there are no complications: i.e., if everything matchable is
103 * straight forward in the bitmap */
104 #define REGINCLASS(prog,p,c) (ANYOF_FLAGS(p) ? reginclass(prog,p,c,0,0) \
105 : ANYOF_BITMAP_TEST(p,*(c)))
111 #define CHR_SVLEN(sv) (utf8_target ? sv_len_utf8(sv) : SvCUR(sv))
112 #define CHR_DIST(a,b) (PL_reg_match_utf8 ? utf8_distance(a,b) : a - b)
114 #define HOPc(pos,off) \
115 (char *)(PL_reg_match_utf8 \
116 ? reghop3((U8*)pos, off, (U8*)(off >= 0 ? PL_regeol : PL_bostr)) \
118 #define HOPBACKc(pos, off) \
119 (char*)(PL_reg_match_utf8\
120 ? reghopmaybe3((U8*)pos, -off, (U8*)PL_bostr) \
121 : (pos - off >= PL_bostr) \
125 #define HOP3(pos,off,lim) (PL_reg_match_utf8 ? reghop3((U8*)(pos), off, (U8*)(lim)) : (U8*)(pos + off))
126 #define HOP3c(pos,off,lim) ((char*)HOP3(pos,off,lim))
128 /* these are unrolled below in the CCC_TRY_XXX defined */
129 #define LOAD_UTF8_CHARCLASS(class,str) STMT_START { \
130 if (!CAT2(PL_utf8_,class)) { bool ok; ENTER; save_re_context(); ok=CAT2(is_utf8_,class)((const U8*)str); assert(ok); LEAVE; } } STMT_END
132 /* Doesn't do an assert to verify that is correct */
133 #define LOAD_UTF8_CHARCLASS_NO_CHECK(class) STMT_START { \
134 if (!CAT2(PL_utf8_,class)) { bool throw_away; ENTER; save_re_context(); throw_away = CAT2(is_utf8_,class)((const U8*)" "); LEAVE; } } STMT_END
136 #define LOAD_UTF8_CHARCLASS_ALNUM() LOAD_UTF8_CHARCLASS(alnum,"a")
137 #define LOAD_UTF8_CHARCLASS_DIGIT() LOAD_UTF8_CHARCLASS(digit,"0")
138 #define LOAD_UTF8_CHARCLASS_SPACE() LOAD_UTF8_CHARCLASS(space," ")
140 #define LOAD_UTF8_CHARCLASS_GCB() /* Grapheme cluster boundaries */ \
141 LOAD_UTF8_CHARCLASS(X_begin, " "); \
142 LOAD_UTF8_CHARCLASS(X_non_hangul, "A"); \
143 /* These are utf8 constants, and not utf-ebcdic constants, so the \
144 * assert should likely and hopefully fail on an EBCDIC machine */ \
145 LOAD_UTF8_CHARCLASS(X_extend, "\xcc\x80"); /* U+0300 */ \
147 /* No asserts are done for these, in case called on an early \
148 * Unicode version in which they map to nothing */ \
149 LOAD_UTF8_CHARCLASS_NO_CHECK(X_prepend);/* U+0E40 "\xe0\xb9\x80" */ \
150 LOAD_UTF8_CHARCLASS_NO_CHECK(X_L); /* U+1100 "\xe1\x84\x80" */ \
151 LOAD_UTF8_CHARCLASS_NO_CHECK(X_LV); /* U+AC00 "\xea\xb0\x80" */ \
152 LOAD_UTF8_CHARCLASS_NO_CHECK(X_LVT); /* U+AC01 "\xea\xb0\x81" */ \
153 LOAD_UTF8_CHARCLASS_NO_CHECK(X_LV_LVT_V);/* U+AC01 "\xea\xb0\x81" */\
154 LOAD_UTF8_CHARCLASS_NO_CHECK(X_T); /* U+11A8 "\xe1\x86\xa8" */ \
155 LOAD_UTF8_CHARCLASS_NO_CHECK(X_V) /* U+1160 "\xe1\x85\xa0" */
157 #define PLACEHOLDER /* Something for the preprocessor to grab onto */
159 /* The actual code for CCC_TRY, which uses several variables from the routine
160 * it's callable from. It is designed to be the bulk of a case statement.
161 * FUNC is the macro or function to call on non-utf8 targets that indicate if
162 * nextchr matches the class.
163 * UTF8_TEST is the whole test string to use for utf8 targets
164 * LOAD is what to use to test, and if not present to load in the swash for the
166 * POS_OR_NEG is either empty or ! to complement the results of FUNC or
168 * The logic is: Fail if we're at the end-of-string; otherwise if the target is
169 * utf8 and a variant, load the swash if necessary and test using the utf8
170 * test. Advance to the next character if test is ok, otherwise fail; If not
171 * utf8 or an invariant under utf8, use the non-utf8 test, and fail if it
172 * fails, or advance to the next character */
174 #define _CCC_TRY_CODE(POS_OR_NEG, FUNC, UTF8_TEST, CLASS, STR) \
175 if (locinput >= PL_regeol) { \
178 if (utf8_target && UTF8_IS_CONTINUED(nextchr)) { \
179 LOAD_UTF8_CHARCLASS(CLASS, STR); \
180 if (POS_OR_NEG (UTF8_TEST)) { \
183 locinput += PL_utf8skip[nextchr]; \
184 nextchr = UCHARAT(locinput); \
187 if (POS_OR_NEG (FUNC(nextchr))) { \
190 nextchr = UCHARAT(++locinput); \
193 /* Handle the non-locale cases for a character class and its complement. It
194 * calls _CCC_TRY_CODE with a ! to complement the test for the character class.
195 * This is because that code fails when the test succeeds, so we want to have
196 * the test fail so that the code succeeds. The swash is stored in a
197 * predictable PL_ place */
198 #define _CCC_TRY_NONLOCALE(NAME, NNAME, FUNC, \
201 _CCC_TRY_CODE( !, FUNC, \
202 cBOOL(swash_fetch(CAT2(PL_utf8_,CLASS), \
203 (U8*)locinput, TRUE)), \
206 _CCC_TRY_CODE( PLACEHOLDER , FUNC, \
207 cBOOL(swash_fetch(CAT2(PL_utf8_,CLASS), \
208 (U8*)locinput, TRUE)), \
211 /* Generate the case statements for both locale and non-locale character
212 * classes in regmatch for classes that don't have special unicode semantics.
213 * Locales don't use an immediate swash, but an intermediary special locale
214 * function that is called on the pointer to the current place in the input
215 * string. That function will resolve to needing the same swash. One might
216 * think that because we don't know what the locale will match, we shouldn't
217 * check with the swash loading function that it loaded properly; ie, that we
218 * should use LOAD_UTF8_CHARCLASS_NO_CHECK for those, but what is passed to the
219 * regular LOAD_UTF8_CHARCLASS is in non-locale terms, and so locale is
221 #define CCC_TRY(NAME, NNAME, FUNC, \
222 NAMEL, NNAMEL, LCFUNC, LCFUNC_utf8, \
223 NAMEA, NNAMEA, FUNCA, \
226 PL_reg_flags |= RF_tainted; \
227 _CCC_TRY_CODE( !, LCFUNC, LCFUNC_utf8((U8*)locinput), CLASS, STR) \
229 PL_reg_flags |= RF_tainted; \
230 _CCC_TRY_CODE( PLACEHOLDER, LCFUNC, LCFUNC_utf8((U8*)locinput), \
233 if (locinput >= PL_regeol || ! FUNCA(nextchr)) { \
236 /* Matched a utf8-invariant, so don't have to worry about utf8 */ \
237 nextchr = UCHARAT(++locinput); \
240 if (locinput >= PL_regeol || FUNCA(nextchr)) { \
244 locinput += PL_utf8skip[nextchr]; \
245 nextchr = UCHARAT(locinput); \
248 nextchr = UCHARAT(++locinput); \
251 /* Generate the non-locale cases */ \
252 _CCC_TRY_NONLOCALE(NAME, NNAME, FUNC, CLASS, STR)
254 /* This is like CCC_TRY, but has an extra set of parameters for generating case
255 * statements to handle separate Unicode semantics nodes */
256 #define CCC_TRY_U(NAME, NNAME, FUNC, \
257 NAMEL, NNAMEL, LCFUNC, LCFUNC_utf8, \
258 NAMEU, NNAMEU, FUNCU, \
259 NAMEA, NNAMEA, FUNCA, \
261 CCC_TRY(NAME, NNAME, FUNC, \
262 NAMEL, NNAMEL, LCFUNC, LCFUNC_utf8, \
263 NAMEA, NNAMEA, FUNCA, \
265 _CCC_TRY_NONLOCALE(NAMEU, NNAMEU, FUNCU, CLASS, STR)
267 /* TODO: Combine JUMPABLE and HAS_TEXT to cache OP(rn) */
269 /* for use after a quantifier and before an EXACT-like node -- japhy */
270 /* it would be nice to rework regcomp.sym to generate this stuff. sigh
272 * NOTE that *nothing* that affects backtracking should be in here, specifically
273 * VERBS must NOT be included. JUMPABLE is used to determine if we can ignore a
274 * node that is in between two EXACT like nodes when ascertaining what the required
275 * "follow" character is. This should probably be moved to regex compile time
276 * although it may be done at run time beause of the REF possibility - more
277 * investigation required. -- demerphq
279 #define JUMPABLE(rn) ( \
281 (OP(rn) == CLOSE && (!cur_eval || cur_eval->u.eval.close_paren != ARG(rn))) || \
283 OP(rn) == SUSPEND || OP(rn) == IFMATCH || \
284 OP(rn) == PLUS || OP(rn) == MINMOD || \
286 (PL_regkind[OP(rn)] == CURLY && ARG1(rn) > 0) \
288 #define IS_EXACT(rn) (PL_regkind[OP(rn)] == EXACT)
290 #define HAS_TEXT(rn) ( IS_EXACT(rn) || PL_regkind[OP(rn)] == REF )
293 /* Currently these are only used when PL_regkind[OP(rn)] == EXACT so
294 we don't need this definition. */
295 #define IS_TEXT(rn) ( OP(rn)==EXACT || OP(rn)==REF || OP(rn)==NREF )
296 #define IS_TEXTF(rn) ( (OP(rn)==EXACTFU || OP(rn)==EXACTFA || OP(rn)==EXACTF) || OP(rn)==REFF || OP(rn)==NREFF )
297 #define IS_TEXTFL(rn) ( OP(rn)==EXACTFL || OP(rn)==REFFL || OP(rn)==NREFFL )
300 /* ... so we use this as its faster. */
301 #define IS_TEXT(rn) ( OP(rn)==EXACT )
302 #define IS_TEXTFU(rn) ( OP(rn)==EXACTFU || OP(rn) == EXACTFA)
303 #define IS_TEXTF(rn) ( OP(rn)==EXACTF )
304 #define IS_TEXTFL(rn) ( OP(rn)==EXACTFL )
309 Search for mandatory following text node; for lookahead, the text must
310 follow but for lookbehind (rn->flags != 0) we skip to the next step.
312 #define FIND_NEXT_IMPT(rn) STMT_START { \
313 while (JUMPABLE(rn)) { \
314 const OPCODE type = OP(rn); \
315 if (type == SUSPEND || PL_regkind[type] == CURLY) \
316 rn = NEXTOPER(NEXTOPER(rn)); \
317 else if (type == PLUS) \
319 else if (type == IFMATCH) \
320 rn = (rn->flags == 0) ? NEXTOPER(NEXTOPER(rn)) : rn + ARG(rn); \
321 else rn += NEXT_OFF(rn); \
326 static void restore_pos(pTHX_ void *arg);
328 #define REGCP_PAREN_ELEMS 4
329 #define REGCP_OTHER_ELEMS 5
330 #define REGCP_FRAME_ELEMS 1
331 /* REGCP_FRAME_ELEMS are not part of the REGCP_OTHER_ELEMS and
332 * are needed for the regexp context stack bookkeeping. */
335 S_regcppush(pTHX_ I32 parenfloor)
338 const int retval = PL_savestack_ix;
339 const int paren_elems_to_push = (PL_regsize - parenfloor) * REGCP_PAREN_ELEMS;
340 const UV total_elems = paren_elems_to_push + REGCP_OTHER_ELEMS;
341 const UV elems_shifted = total_elems << SAVE_TIGHT_SHIFT;
343 GET_RE_DEBUG_FLAGS_DECL;
345 if (paren_elems_to_push < 0)
346 Perl_croak(aTHX_ "panic: paren_elems_to_push < 0");
348 if ((elems_shifted >> SAVE_TIGHT_SHIFT) != total_elems)
349 Perl_croak(aTHX_ "panic: paren_elems_to_push offset %"UVuf
350 " out of range (%lu-%ld)",
351 total_elems, (unsigned long)PL_regsize, (long)parenfloor);
353 SSGROW(total_elems + REGCP_FRAME_ELEMS);
355 for (p = PL_regsize; p > parenfloor; p--) {
356 /* REGCP_PARENS_ELEMS are pushed per pairs of parentheses. */
357 SSPUSHINT(PL_regoffs[p].end);
358 SSPUSHINT(PL_regoffs[p].start);
359 SSPUSHPTR(PL_reg_start_tmp[p]);
361 DEBUG_BUFFERS_r(PerlIO_printf(Perl_debug_log,
362 " saving \\%"UVuf" %"IVdf"(%"IVdf")..%"IVdf"\n",
363 (UV)p, (IV)PL_regoffs[p].start,
364 (IV)(PL_reg_start_tmp[p] - PL_bostr),
365 (IV)PL_regoffs[p].end
368 /* REGCP_OTHER_ELEMS are pushed in any case, parentheses or no. */
369 SSPUSHPTR(PL_regoffs);
370 SSPUSHINT(PL_regsize);
371 SSPUSHINT(*PL_reglastparen);
372 SSPUSHINT(*PL_reglastcloseparen);
373 SSPUSHPTR(PL_reginput);
374 SSPUSHUV(SAVEt_REGCONTEXT | elems_shifted); /* Magic cookie. */
379 /* These are needed since we do not localize EVAL nodes: */
380 #define REGCP_SET(cp) \
382 PerlIO_printf(Perl_debug_log, \
383 " Setting an EVAL scope, savestack=%"IVdf"\n", \
384 (IV)PL_savestack_ix)); \
387 #define REGCP_UNWIND(cp) \
389 if (cp != PL_savestack_ix) \
390 PerlIO_printf(Perl_debug_log, \
391 " Clearing an EVAL scope, savestack=%"IVdf"..%"IVdf"\n", \
392 (IV)(cp), (IV)PL_savestack_ix)); \
396 S_regcppop(pTHX_ const regexp *rex)
401 GET_RE_DEBUG_FLAGS_DECL;
403 PERL_ARGS_ASSERT_REGCPPOP;
405 /* Pop REGCP_OTHER_ELEMS before the parentheses loop starts. */
407 assert((i & SAVE_MASK) == SAVEt_REGCONTEXT); /* Check that the magic cookie is there. */
408 i >>= SAVE_TIGHT_SHIFT; /* Parentheses elements to pop. */
409 input = (char *) SSPOPPTR;
410 *PL_reglastcloseparen = SSPOPINT;
411 *PL_reglastparen = SSPOPINT;
412 PL_regsize = SSPOPINT;
413 PL_regoffs=(regexp_paren_pair *) SSPOPPTR;
415 i -= REGCP_OTHER_ELEMS;
416 /* Now restore the parentheses context. */
417 for ( ; i > 0; i -= REGCP_PAREN_ELEMS) {
419 U32 paren = (U32)SSPOPINT;
420 PL_reg_start_tmp[paren] = (char *) SSPOPPTR;
421 PL_regoffs[paren].start = SSPOPINT;
423 if (paren <= *PL_reglastparen)
424 PL_regoffs[paren].end = tmps;
426 PerlIO_printf(Perl_debug_log,
427 " restoring \\%"UVuf" to %"IVdf"(%"IVdf")..%"IVdf"%s\n",
428 (UV)paren, (IV)PL_regoffs[paren].start,
429 (IV)(PL_reg_start_tmp[paren] - PL_bostr),
430 (IV)PL_regoffs[paren].end,
431 (paren > *PL_reglastparen ? "(no)" : ""));
435 if (*PL_reglastparen + 1 <= rex->nparens) {
436 PerlIO_printf(Perl_debug_log,
437 " restoring \\%"IVdf"..\\%"IVdf" to undef\n",
438 (IV)(*PL_reglastparen + 1), (IV)rex->nparens);
442 /* It would seem that the similar code in regtry()
443 * already takes care of this, and in fact it is in
444 * a better location to since this code can #if 0-ed out
445 * but the code in regtry() is needed or otherwise tests
446 * requiring null fields (pat.t#187 and split.t#{13,14}
447 * (as of patchlevel 7877) will fail. Then again,
448 * this code seems to be necessary or otherwise
449 * this erroneously leaves $1 defined: "1" =~ /^(?:(\d)x)?\d$/
450 * --jhi updated by dapm */
451 for (i = *PL_reglastparen + 1; i <= rex->nparens; i++) {
453 PL_regoffs[i].start = -1;
454 PL_regoffs[i].end = -1;
460 #define regcpblow(cp) LEAVE_SCOPE(cp) /* Ignores regcppush()ed data. */
463 * pregexec and friends
466 #ifndef PERL_IN_XSUB_RE
468 - pregexec - match a regexp against a string
471 Perl_pregexec(pTHX_ REGEXP * const prog, char* stringarg, register char *strend,
472 char *strbeg, I32 minend, SV *screamer, U32 nosave)
473 /* strend: pointer to null at end of string */
474 /* strbeg: real beginning of string */
475 /* minend: end of match must be >=minend after stringarg. */
476 /* nosave: For optimizations. */
478 PERL_ARGS_ASSERT_PREGEXEC;
481 regexec_flags(prog, stringarg, strend, strbeg, minend, screamer, NULL,
482 nosave ? 0 : REXEC_COPY_STR);
487 * Need to implement the following flags for reg_anch:
489 * USE_INTUIT_NOML - Useful to call re_intuit_start() first
491 * INTUIT_AUTORITATIVE_NOML - Can trust a positive answer
492 * INTUIT_AUTORITATIVE_ML
493 * INTUIT_ONCE_NOML - Intuit can match in one location only.
496 * Another flag for this function: SECOND_TIME (so that float substrs
497 * with giant delta may be not rechecked).
500 /* Assumptions: if ANCH_GPOS, then strpos is anchored. XXXX Check GPOS logic */
502 /* If SCREAM, then SvPVX_const(sv) should be compatible with strpos and strend.
503 Otherwise, only SvCUR(sv) is used to get strbeg. */
505 /* XXXX We assume that strpos is strbeg unless sv. */
507 /* XXXX Some places assume that there is a fixed substring.
508 An update may be needed if optimizer marks as "INTUITable"
509 RExen without fixed substrings. Similarly, it is assumed that
510 lengths of all the strings are no more than minlen, thus they
511 cannot come from lookahead.
512 (Or minlen should take into account lookahead.)
513 NOTE: Some of this comment is not correct. minlen does now take account
514 of lookahead/behind. Further research is required. -- demerphq
518 /* A failure to find a constant substring means that there is no need to make
519 an expensive call to REx engine, thus we celebrate a failure. Similarly,
520 finding a substring too deep into the string means that less calls to
521 regtry() should be needed.
523 REx compiler's optimizer found 4 possible hints:
524 a) Anchored substring;
526 c) Whether we are anchored (beginning-of-line or \G);
527 d) First node (of those at offset 0) which may distinguish positions;
528 We use a)b)d) and multiline-part of c), and try to find a position in the
529 string which does not contradict any of them.
532 /* Most of decisions we do here should have been done at compile time.
533 The nodes of the REx which we used for the search should have been
534 deleted from the finite automaton. */
537 Perl_re_intuit_start(pTHX_ REGEXP * const rx, SV *sv, char *strpos,
538 char *strend, const U32 flags, re_scream_pos_data *data)
541 struct regexp *const prog = (struct regexp *)SvANY(rx);
542 register I32 start_shift = 0;
543 /* Should be nonnegative! */
544 register I32 end_shift = 0;
549 const bool utf8_target = (sv && SvUTF8(sv)) ? 1 : 0; /* if no sv we have to assume bytes */
551 register char *other_last = NULL; /* other substr checked before this */
552 char *check_at = NULL; /* check substr found at this pos */
553 const I32 multiline = prog->extflags & RXf_PMf_MULTILINE;
554 RXi_GET_DECL(prog,progi);
556 const char * const i_strpos = strpos;
558 GET_RE_DEBUG_FLAGS_DECL;
560 PERL_ARGS_ASSERT_RE_INTUIT_START;
562 RX_MATCH_UTF8_set(rx,utf8_target);
565 PL_reg_flags |= RF_utf8;
568 debug_start_match(rx, utf8_target, strpos, strend,
569 sv ? "Guessing start of match in sv for"
570 : "Guessing start of match in string for");
573 /* CHR_DIST() would be more correct here but it makes things slow. */
574 if (prog->minlen > strend - strpos) {
575 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
576 "String too short... [re_intuit_start]\n"));
580 strbeg = (sv && SvPOK(sv)) ? strend - SvCUR(sv) : strpos;
583 if (!prog->check_utf8 && prog->check_substr)
584 to_utf8_substr(prog);
585 check = prog->check_utf8;
587 if (!prog->check_substr && prog->check_utf8)
588 to_byte_substr(prog);
589 check = prog->check_substr;
591 if (check == &PL_sv_undef) {
592 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
593 "Non-utf8 string cannot match utf8 check string\n"));
596 if (prog->extflags & RXf_ANCH) { /* Match at beg-of-str or after \n */
597 ml_anch = !( (prog->extflags & RXf_ANCH_SINGLE)
598 || ( (prog->extflags & RXf_ANCH_BOL)
599 && !multiline ) ); /* Check after \n? */
602 if ( !(prog->extflags & RXf_ANCH_GPOS) /* Checked by the caller */
603 && !(prog->intflags & PREGf_IMPLICIT) /* not a real BOL */
604 /* SvCUR is not set on references: SvRV and SvPVX_const overlap */
606 && (strpos != strbeg)) {
607 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Not at start...\n"));
610 if (prog->check_offset_min == prog->check_offset_max &&
611 !(prog->extflags & RXf_CANY_SEEN)) {
612 /* Substring at constant offset from beg-of-str... */
615 s = HOP3c(strpos, prog->check_offset_min, strend);
618 slen = SvCUR(check); /* >= 1 */
620 if ( strend - s > slen || strend - s < slen - 1
621 || (strend - s == slen && strend[-1] != '\n')) {
622 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "String too long...\n"));
625 /* Now should match s[0..slen-2] */
627 if (slen && (*SvPVX_const(check) != *s
629 && memNE(SvPVX_const(check), s, slen)))) {
631 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "String not equal...\n"));
635 else if (*SvPVX_const(check) != *s
636 || ((slen = SvCUR(check)) > 1
637 && memNE(SvPVX_const(check), s, slen)))
640 goto success_at_start;
643 /* Match is anchored, but substr is not anchored wrt beg-of-str. */
645 start_shift = prog->check_offset_min; /* okay to underestimate on CC */
646 end_shift = prog->check_end_shift;
649 const I32 end = prog->check_offset_max + CHR_SVLEN(check)
650 - (SvTAIL(check) != 0);
651 const I32 eshift = CHR_DIST((U8*)strend, (U8*)s) - end;
653 if (end_shift < eshift)
657 else { /* Can match at random position */
660 start_shift = prog->check_offset_min; /* okay to underestimate on CC */
661 end_shift = prog->check_end_shift;
663 /* end shift should be non negative here */
666 #ifdef QDEBUGGING /* 7/99: reports of failure (with the older version) */
668 Perl_croak(aTHX_ "panic: end_shift: %"IVdf" pattern:\n%s\n ",
669 (IV)end_shift, RX_PRECOMP(prog));
673 /* Find a possible match in the region s..strend by looking for
674 the "check" substring in the region corrected by start/end_shift. */
677 I32 srch_start_shift = start_shift;
678 I32 srch_end_shift = end_shift;
679 if (srch_start_shift < 0 && strbeg - s > srch_start_shift) {
680 srch_end_shift -= ((strbeg - s) - srch_start_shift);
681 srch_start_shift = strbeg - s;
683 DEBUG_OPTIMISE_MORE_r({
684 PerlIO_printf(Perl_debug_log, "Check offset min: %"IVdf" Start shift: %"IVdf" End shift %"IVdf" Real End Shift: %"IVdf"\n",
685 (IV)prog->check_offset_min,
686 (IV)srch_start_shift,
688 (IV)prog->check_end_shift);
691 if (flags & REXEC_SCREAM) {
692 I32 p = -1; /* Internal iterator of scream. */
693 I32 * const pp = data ? data->scream_pos : &p;
695 if (PL_screamfirst[BmRARE(check)] >= 0
696 || ( BmRARE(check) == '\n'
697 && (BmPREVIOUS(check) == SvCUR(check) - 1)
699 s = screaminstr(sv, check,
700 srch_start_shift + (s - strbeg), srch_end_shift, pp, 0);
703 /* we may be pointing at the wrong string */
704 if (s && RXp_MATCH_COPIED(prog))
705 s = strbeg + (s - SvPVX_const(sv));
707 *data->scream_olds = s;
712 if (prog->extflags & RXf_CANY_SEEN) {
713 start_point= (U8*)(s + srch_start_shift);
714 end_point= (U8*)(strend - srch_end_shift);
716 start_point= HOP3(s, srch_start_shift, srch_start_shift < 0 ? strbeg : strend);
717 end_point= HOP3(strend, -srch_end_shift, strbeg);
719 DEBUG_OPTIMISE_MORE_r({
720 PerlIO_printf(Perl_debug_log, "fbm_instr len=%d str=<%.*s>\n",
721 (int)(end_point - start_point),
722 (int)(end_point - start_point) > 20 ? 20 : (int)(end_point - start_point),
726 s = fbm_instr( start_point, end_point,
727 check, multiline ? FBMrf_MULTILINE : 0);
730 /* Update the count-of-usability, remove useless subpatterns,
734 RE_PV_QUOTED_DECL(quoted, utf8_target, PERL_DEBUG_PAD_ZERO(0),
735 SvPVX_const(check), RE_SV_DUMPLEN(check), 30);
736 PerlIO_printf(Perl_debug_log, "%s %s substr %s%s%s",
737 (s ? "Found" : "Did not find"),
738 (check == (utf8_target ? prog->anchored_utf8 : prog->anchored_substr)
739 ? "anchored" : "floating"),
742 (s ? " at offset " : "...\n") );
747 /* Finish the diagnostic message */
748 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%ld...\n", (long)(s - i_strpos)) );
750 /* XXX dmq: first branch is for positive lookbehind...
751 Our check string is offset from the beginning of the pattern.
752 So we need to do any stclass tests offset forward from that
761 /* Got a candidate. Check MBOL anchoring, and the *other* substr.
762 Start with the other substr.
763 XXXX no SCREAM optimization yet - and a very coarse implementation
764 XXXX /ttx+/ results in anchored="ttx", floating="x". floating will
765 *always* match. Probably should be marked during compile...
766 Probably it is right to do no SCREAM here...
769 if (utf8_target ? (prog->float_utf8 && prog->anchored_utf8)
770 : (prog->float_substr && prog->anchored_substr))
772 /* Take into account the "other" substring. */
773 /* XXXX May be hopelessly wrong for UTF... */
776 if (check == (utf8_target ? prog->float_utf8 : prog->float_substr)) {
779 char * const last = HOP3c(s, -start_shift, strbeg);
781 char * const saved_s = s;
784 t = s - prog->check_offset_max;
785 if (s - strpos > prog->check_offset_max /* signed-corrected t > strpos */
787 || ((t = (char*)reghopmaybe3((U8*)s, -(prog->check_offset_max), (U8*)strpos))
792 t = HOP3c(t, prog->anchored_offset, strend);
793 if (t < other_last) /* These positions already checked */
795 last2 = last1 = HOP3c(strend, -prog->minlen, strbeg);
798 /* XXXX It is not documented what units *_offsets are in.
799 We assume bytes, but this is clearly wrong.
800 Meaning this code needs to be carefully reviewed for errors.
804 /* On end-of-str: see comment below. */
805 must = utf8_target ? prog->anchored_utf8 : prog->anchored_substr;
806 if (must == &PL_sv_undef) {
808 DEBUG_r(must = prog->anchored_utf8); /* for debug */
813 HOP3(HOP3(last1, prog->anchored_offset, strend)
814 + SvCUR(must), -(SvTAIL(must)!=0), strbeg),
816 multiline ? FBMrf_MULTILINE : 0
819 RE_PV_QUOTED_DECL(quoted, utf8_target, PERL_DEBUG_PAD_ZERO(0),
820 SvPVX_const(must), RE_SV_DUMPLEN(must), 30);
821 PerlIO_printf(Perl_debug_log, "%s anchored substr %s%s",
822 (s ? "Found" : "Contradicts"),
823 quoted, RE_SV_TAIL(must));
828 if (last1 >= last2) {
829 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
830 ", giving up...\n"));
833 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
834 ", trying floating at offset %ld...\n",
835 (long)(HOP3c(saved_s, 1, strend) - i_strpos)));
836 other_last = HOP3c(last1, prog->anchored_offset+1, strend);
837 s = HOP3c(last, 1, strend);
841 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, " at offset %ld...\n",
842 (long)(s - i_strpos)));
843 t = HOP3c(s, -prog->anchored_offset, strbeg);
844 other_last = HOP3c(s, 1, strend);
852 else { /* Take into account the floating substring. */
854 char * const saved_s = s;
857 t = HOP3c(s, -start_shift, strbeg);
859 HOP3c(strend, -prog->minlen + prog->float_min_offset, strbeg);
860 if (CHR_DIST((U8*)last, (U8*)t) > prog->float_max_offset)
861 last = HOP3c(t, prog->float_max_offset, strend);
862 s = HOP3c(t, prog->float_min_offset, strend);
865 /* XXXX It is not documented what units *_offsets are in. Assume bytes. */
866 must = utf8_target ? prog->float_utf8 : prog->float_substr;
867 /* fbm_instr() takes into account exact value of end-of-str
868 if the check is SvTAIL(ed). Since false positives are OK,
869 and end-of-str is not later than strend we are OK. */
870 if (must == &PL_sv_undef) {
872 DEBUG_r(must = prog->float_utf8); /* for debug message */
875 s = fbm_instr((unsigned char*)s,
876 (unsigned char*)last + SvCUR(must)
878 must, multiline ? FBMrf_MULTILINE : 0);
880 RE_PV_QUOTED_DECL(quoted, utf8_target, PERL_DEBUG_PAD_ZERO(0),
881 SvPVX_const(must), RE_SV_DUMPLEN(must), 30);
882 PerlIO_printf(Perl_debug_log, "%s floating substr %s%s",
883 (s ? "Found" : "Contradicts"),
884 quoted, RE_SV_TAIL(must));
888 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
889 ", giving up...\n"));
892 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
893 ", trying anchored starting at offset %ld...\n",
894 (long)(saved_s + 1 - i_strpos)));
896 s = HOP3c(t, 1, strend);
900 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, " at offset %ld...\n",
901 (long)(s - i_strpos)));
902 other_last = s; /* Fix this later. --Hugo */
912 t= (char*)HOP3( s, -prog->check_offset_max, (prog->check_offset_max<0) ? strend : strpos);
914 DEBUG_OPTIMISE_MORE_r(
915 PerlIO_printf(Perl_debug_log,
916 "Check offset min:%"IVdf" max:%"IVdf" S:%"IVdf" t:%"IVdf" D:%"IVdf" end:%"IVdf"\n",
917 (IV)prog->check_offset_min,
918 (IV)prog->check_offset_max,
926 if (s - strpos > prog->check_offset_max /* signed-corrected t > strpos */
928 || ((t = (char*)reghopmaybe3((U8*)s, -prog->check_offset_max, (U8*) ((prog->check_offset_max<0) ? strend : strpos)))
931 /* Fixed substring is found far enough so that the match
932 cannot start at strpos. */
934 if (ml_anch && t[-1] != '\n') {
935 /* Eventually fbm_*() should handle this, but often
936 anchored_offset is not 0, so this check will not be wasted. */
937 /* XXXX In the code below we prefer to look for "^" even in
938 presence of anchored substrings. And we search even
939 beyond the found float position. These pessimizations
940 are historical artefacts only. */
942 while (t < strend - prog->minlen) {
944 if (t < check_at - prog->check_offset_min) {
945 if (utf8_target ? prog->anchored_utf8 : prog->anchored_substr) {
946 /* Since we moved from the found position,
947 we definitely contradict the found anchored
948 substr. Due to the above check we do not
949 contradict "check" substr.
950 Thus we can arrive here only if check substr
951 is float. Redo checking for "other"=="fixed".
954 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m at offset %ld, rescanning for anchored from offset %ld...\n",
955 PL_colors[0], PL_colors[1], (long)(strpos - i_strpos), (long)(strpos - i_strpos + prog->anchored_offset)));
956 goto do_other_anchored;
958 /* We don't contradict the found floating substring. */
959 /* XXXX Why not check for STCLASS? */
961 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m at offset %ld...\n",
962 PL_colors[0], PL_colors[1], (long)(s - i_strpos)));
965 /* Position contradicts check-string */
966 /* XXXX probably better to look for check-string
967 than for "\n", so one should lower the limit for t? */
968 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m, restarting lookup for check-string at offset %ld...\n",
969 PL_colors[0], PL_colors[1], (long)(t + 1 - i_strpos)));
970 other_last = strpos = s = t + 1;
975 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Did not find /%s^%s/m...\n",
976 PL_colors[0], PL_colors[1]));
980 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Starting position does not contradict /%s^%s/m...\n",
981 PL_colors[0], PL_colors[1]));
985 ++BmUSEFUL(utf8_target ? prog->check_utf8 : prog->check_substr); /* hooray/5 */
988 /* The found string does not prohibit matching at strpos,
989 - no optimization of calling REx engine can be performed,
990 unless it was an MBOL and we are not after MBOL,
991 or a future STCLASS check will fail this. */
993 /* Even in this situation we may use MBOL flag if strpos is offset
994 wrt the start of the string. */
995 if (ml_anch && sv && !SvROK(sv) /* See prev comment on SvROK */
996 && (strpos != strbeg) && strpos[-1] != '\n'
997 /* May be due to an implicit anchor of m{.*foo} */
998 && !(prog->intflags & PREGf_IMPLICIT))
1003 DEBUG_EXECUTE_r( if (ml_anch)
1004 PerlIO_printf(Perl_debug_log, "Position at offset %ld does not contradict /%s^%s/m...\n",
1005 (long)(strpos - i_strpos), PL_colors[0], PL_colors[1]);
1008 if (!(prog->intflags & PREGf_NAUGHTY) /* XXXX If strpos moved? */
1010 prog->check_utf8 /* Could be deleted already */
1011 && --BmUSEFUL(prog->check_utf8) < 0
1012 && (prog->check_utf8 == prog->float_utf8)
1014 prog->check_substr /* Could be deleted already */
1015 && --BmUSEFUL(prog->check_substr) < 0
1016 && (prog->check_substr == prog->float_substr)
1019 /* If flags & SOMETHING - do not do it many times on the same match */
1020 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "... Disabling check substring...\n"));
1021 /* XXX Does the destruction order has to change with utf8_target? */
1022 SvREFCNT_dec(utf8_target ? prog->check_utf8 : prog->check_substr);
1023 SvREFCNT_dec(utf8_target ? prog->check_substr : prog->check_utf8);
1024 prog->check_substr = prog->check_utf8 = NULL; /* disable */
1025 prog->float_substr = prog->float_utf8 = NULL; /* clear */
1026 check = NULL; /* abort */
1028 /* XXXX If the check string was an implicit check MBOL, then we need to unset the relevant flag
1029 see http://bugs.activestate.com/show_bug.cgi?id=87173 */
1030 if (prog->intflags & PREGf_IMPLICIT)
1031 prog->extflags &= ~RXf_ANCH_MBOL;
1032 /* XXXX This is a remnant of the old implementation. It
1033 looks wasteful, since now INTUIT can use many
1034 other heuristics. */
1035 prog->extflags &= ~RXf_USE_INTUIT;
1036 /* XXXX What other flags might need to be cleared in this branch? */
1042 /* Last resort... */
1043 /* XXXX BmUSEFUL already changed, maybe multiple change is meaningful... */
1044 /* trie stclasses are too expensive to use here, we are better off to
1045 leave it to regmatch itself */
1046 if (progi->regstclass && PL_regkind[OP(progi->regstclass)]!=TRIE) {
1047 /* minlen == 0 is possible if regstclass is \b or \B,
1048 and the fixed substr is ''$.
1049 Since minlen is already taken into account, s+1 is before strend;
1050 accidentally, minlen >= 1 guaranties no false positives at s + 1
1051 even for \b or \B. But (minlen? 1 : 0) below assumes that
1052 regstclass does not come from lookahead... */
1053 /* If regstclass takes bytelength more than 1: If charlength==1, OK.
1054 This leaves EXACTF-ish only, which are dealt with in find_byclass(). */
1055 const U8* const str = (U8*)STRING(progi->regstclass);
1056 const int cl_l = (PL_regkind[OP(progi->regstclass)] == EXACT
1057 ? CHR_DIST(str+STR_LEN(progi->regstclass), str)
1060 if (prog->anchored_substr || prog->anchored_utf8 || ml_anch)
1061 endpos= HOP3c(s, (prog->minlen ? cl_l : 0), strend);
1062 else if (prog->float_substr || prog->float_utf8)
1063 endpos= HOP3c(HOP3c(check_at, -start_shift, strbeg), cl_l, strend);
1067 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "start_shift: %"IVdf" check_at: %"IVdf" s: %"IVdf" endpos: %"IVdf"\n",
1068 (IV)start_shift, (IV)(check_at - strbeg), (IV)(s - strbeg), (IV)(endpos - strbeg)));
1071 s = find_byclass(prog, progi->regstclass, s, endpos, NULL);
1074 const char *what = NULL;
1076 if (endpos == strend) {
1077 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
1078 "Could not match STCLASS...\n") );
1081 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
1082 "This position contradicts STCLASS...\n") );
1083 if ((prog->extflags & RXf_ANCH) && !ml_anch)
1085 /* Contradict one of substrings */
1086 if (prog->anchored_substr || prog->anchored_utf8) {
1087 if ((utf8_target ? prog->anchored_utf8 : prog->anchored_substr) == check) {
1088 DEBUG_EXECUTE_r( what = "anchored" );
1090 s = HOP3c(t, 1, strend);
1091 if (s + start_shift + end_shift > strend) {
1092 /* XXXX Should be taken into account earlier? */
1093 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
1094 "Could not match STCLASS...\n") );
1099 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
1100 "Looking for %s substr starting at offset %ld...\n",
1101 what, (long)(s + start_shift - i_strpos)) );
1104 /* Have both, check_string is floating */
1105 if (t + start_shift >= check_at) /* Contradicts floating=check */
1106 goto retry_floating_check;
1107 /* Recheck anchored substring, but not floating... */
1111 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
1112 "Looking for anchored substr starting at offset %ld...\n",
1113 (long)(other_last - i_strpos)) );
1114 goto do_other_anchored;
1116 /* Another way we could have checked stclass at the
1117 current position only: */
1122 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
1123 "Looking for /%s^%s/m starting at offset %ld...\n",
1124 PL_colors[0], PL_colors[1], (long)(t - i_strpos)) );
1127 if (!(utf8_target ? prog->float_utf8 : prog->float_substr)) /* Could have been deleted */
1129 /* Check is floating substring. */
1130 retry_floating_check:
1131 t = check_at - start_shift;
1132 DEBUG_EXECUTE_r( what = "floating" );
1133 goto hop_and_restart;
1136 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
1137 "By STCLASS: moving %ld --> %ld\n",
1138 (long)(t - i_strpos), (long)(s - i_strpos))
1142 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
1143 "Does not contradict STCLASS...\n");
1148 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%s%s:%s match at offset %ld\n",
1149 PL_colors[4], (check ? "Guessed" : "Giving up"),
1150 PL_colors[5], (long)(s - i_strpos)) );
1153 fail_finish: /* Substring not found */
1154 if (prog->check_substr || prog->check_utf8) /* could be removed already */
1155 BmUSEFUL(utf8_target ? prog->check_utf8 : prog->check_substr) += 5; /* hooray */
1157 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch rejected by optimizer%s\n",
1158 PL_colors[4], PL_colors[5]));
1162 #define DECL_TRIE_TYPE(scan) \
1163 const enum { trie_plain, trie_utf8, trie_utf8_fold, trie_latin_utf8_fold } \
1164 trie_type = (scan->flags != EXACT) \
1165 ? (utf8_target ? trie_utf8_fold : (UTF_PATTERN ? trie_latin_utf8_fold : trie_plain)) \
1166 : (utf8_target ? trie_utf8 : trie_plain)
1168 #define REXEC_TRIE_READ_CHAR(trie_type, trie, widecharmap, uc, uscan, len, \
1169 uvc, charid, foldlen, foldbuf, uniflags) STMT_START { \
1170 switch (trie_type) { \
1171 case trie_utf8_fold: \
1172 if ( foldlen>0 ) { \
1173 uvc = utf8n_to_uvuni( uscan, UTF8_MAXLEN, &len, uniflags ); \
1178 uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags ); \
1179 uvc = to_uni_fold( uvc, foldbuf, &foldlen ); \
1180 foldlen -= UNISKIP( uvc ); \
1181 uscan = foldbuf + UNISKIP( uvc ); \
1184 case trie_latin_utf8_fold: \
1185 if ( foldlen>0 ) { \
1186 uvc = utf8n_to_uvuni( uscan, UTF8_MAXLEN, &len, uniflags ); \
1192 uvc = to_uni_fold( *(U8*)uc, foldbuf, &foldlen ); \
1193 foldlen -= UNISKIP( uvc ); \
1194 uscan = foldbuf + UNISKIP( uvc ); \
1198 uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags ); \
1205 charid = trie->charmap[ uvc ]; \
1209 if (widecharmap) { \
1210 SV** const svpp = hv_fetch(widecharmap, \
1211 (char*)&uvc, sizeof(UV), 0); \
1213 charid = (U16)SvIV(*svpp); \
1218 #define REXEC_FBC_EXACTISH_SCAN(CoNd) \
1222 && (ln == 1 || folder(s, pat_string, ln)) \
1223 && (!reginfo || regtry(reginfo, &s)) ) \
1229 #define REXEC_FBC_UTF8_SCAN(CoDe) \
1231 while (s + (uskip = UTF8SKIP(s)) <= strend) { \
1237 #define REXEC_FBC_SCAN(CoDe) \
1239 while (s < strend) { \
1245 #define REXEC_FBC_UTF8_CLASS_SCAN(CoNd) \
1246 REXEC_FBC_UTF8_SCAN( \
1248 if (tmp && (!reginfo || regtry(reginfo, &s))) \
1257 #define REXEC_FBC_CLASS_SCAN(CoNd) \
1260 if (tmp && (!reginfo || regtry(reginfo, &s))) \
1269 #define REXEC_FBC_TRYIT \
1270 if ((!reginfo || regtry(reginfo, &s))) \
1273 #define REXEC_FBC_CSCAN(CoNdUtF8,CoNd) \
1274 if (utf8_target) { \
1275 REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8); \
1278 REXEC_FBC_CLASS_SCAN(CoNd); \
1281 #define REXEC_FBC_CSCAN_PRELOAD(UtFpReLoAd,CoNdUtF8,CoNd) \
1282 if (utf8_target) { \
1284 REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8); \
1287 REXEC_FBC_CLASS_SCAN(CoNd); \
1290 #define REXEC_FBC_CSCAN_TAINT(CoNdUtF8,CoNd) \
1291 PL_reg_flags |= RF_tainted; \
1292 if (utf8_target) { \
1293 REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8); \
1296 REXEC_FBC_CLASS_SCAN(CoNd); \
1299 #define DUMP_EXEC_POS(li,s,doutf8) \
1300 dump_exec_pos(li,s,(PL_regeol),(PL_bostr),(PL_reg_starttry),doutf8)
1303 #define UTF8_NOLOAD(TEST_NON_UTF8, IF_SUCCESS, IF_FAIL) \
1304 tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n'; \
1305 tmp = TEST_NON_UTF8(tmp); \
1306 REXEC_FBC_UTF8_SCAN( \
1307 if (tmp == ! TEST_NON_UTF8((U8) *s)) { \
1316 #define UTF8_LOAD(TeSt1_UtF8, TeSt2_UtF8, IF_SUCCESS, IF_FAIL) \
1317 if (s == PL_bostr) { \
1321 U8 * const r = reghop3((U8*)s, -1, (U8*)PL_bostr); \
1322 tmp = utf8n_to_uvchr(r, UTF8SKIP(r), 0, UTF8_ALLOW_DEFAULT); \
1325 LOAD_UTF8_CHARCLASS_ALNUM(); \
1326 REXEC_FBC_UTF8_SCAN( \
1327 if (tmp == ! (TeSt2_UtF8)) { \
1336 /* The only difference between the BOUND and NBOUND cases is that
1337 * REXEC_FBC_TRYIT is called when matched in BOUND, and when non-matched in
1338 * NBOUND. This is accomplished by passing it in either the if or else clause,
1339 * with the other one being empty */
1340 #define FBC_BOUND(TEST_NON_UTF8, TEST1_UTF8, TEST2_UTF8) \
1341 FBC_BOUND_COMMON(UTF8_LOAD(TEST1_UTF8, TEST2_UTF8, REXEC_FBC_TRYIT, PLACEHOLDER), TEST_NON_UTF8, REXEC_FBC_TRYIT, PLACEHOLDER)
1343 #define FBC_BOUND_NOLOAD(TEST_NON_UTF8, TEST1_UTF8, TEST2_UTF8) \
1344 FBC_BOUND_COMMON(UTF8_NOLOAD(TEST_NON_UTF8, REXEC_FBC_TRYIT, PLACEHOLDER), TEST_NON_UTF8, REXEC_FBC_TRYIT, PLACEHOLDER)
1346 #define FBC_NBOUND(TEST_NON_UTF8, TEST1_UTF8, TEST2_UTF8) \
1347 FBC_BOUND_COMMON(UTF8_LOAD(TEST1_UTF8, TEST2_UTF8, PLACEHOLDER, REXEC_FBC_TRYIT), TEST_NON_UTF8, PLACEHOLDER, REXEC_FBC_TRYIT)
1349 #define FBC_NBOUND_NOLOAD(TEST_NON_UTF8, TEST1_UTF8, TEST2_UTF8) \
1350 FBC_BOUND_COMMON(UTF8_NOLOAD(TEST_NON_UTF8, PLACEHOLDER, REXEC_FBC_TRYIT), TEST_NON_UTF8, PLACEHOLDER, REXEC_FBC_TRYIT)
1353 /* Common to the BOUND and NBOUND cases. Unfortunately the UTF8 tests need to
1354 * be passed in completely with the variable name being tested, which isn't
1355 * such a clean interface, but this is easier to read than it was before. We
1356 * are looking for the boundary (or non-boundary between a word and non-word
1357 * character. The utf8 and non-utf8 cases have the same logic, but the details
1358 * must be different. Find the "wordness" of the character just prior to this
1359 * one, and compare it with the wordness of this one. If they differ, we have
1360 * a boundary. At the beginning of the string, pretend that the previous
1361 * character was a new-line */
1362 #define FBC_BOUND_COMMON(UTF8_CODE, TEST_NON_UTF8, IF_SUCCESS, IF_FAIL) \
1363 if (utf8_target) { \
1366 else { /* Not utf8 */ \
1367 tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n'; \
1368 tmp = TEST_NON_UTF8(tmp); \
1370 if (tmp == ! TEST_NON_UTF8((U8) *s)) { \
1379 if ((!prog->minlen && tmp) && (!reginfo || regtry(reginfo, &s))) \
1382 /* We know what class REx starts with. Try to find this position... */
1383 /* if reginfo is NULL, its a dryrun */
1384 /* annoyingly all the vars in this routine have different names from their counterparts
1385 in regmatch. /grrr */
1388 S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
1389 const char *strend, regmatch_info *reginfo)
1392 const I32 doevery = (prog->intflags & PREGf_SKIP) == 0;
1393 char *pat_string; /* The pattern's exactish string */
1394 char *pat_end; /* ptr to end char of pat_string */
1395 re_fold_t folder; /* Function for computing non-utf8 folds */
1396 const U8 *fold_array; /* array for folding ords < 256 */
1399 register STRLEN uskip;
1403 register I32 tmp = 1; /* Scratch variable? */
1404 register const bool utf8_target = PL_reg_match_utf8;
1405 UV utf8_fold_flags = 0;
1406 RXi_GET_DECL(prog,progi);
1408 PERL_ARGS_ASSERT_FIND_BYCLASS;
1410 /* We know what class it must start with. */
1414 if (utf8_target || OP(c) == ANYOFV) {
1415 STRLEN inclasslen = strend - s;
1416 REXEC_FBC_UTF8_CLASS_SCAN(
1417 reginclass(prog, c, (U8*)s, &inclasslen, utf8_target));
1420 REXEC_FBC_CLASS_SCAN(REGINCLASS(prog, c, (U8*)s));
1425 if (tmp && (!reginfo || regtry(reginfo, &s)))
1433 if (UTF_PATTERN || utf8_target) {
1434 utf8_fold_flags = FOLDEQ_UTF8_NOMIX_ASCII;
1435 goto do_exactf_utf8;
1437 fold_array = PL_fold_latin1; /* Latin1 folds are not affected by */
1438 folder = foldEQ_latin1; /* /a, except the sharp s one which */
1439 goto do_exactf_non_utf8; /* isn't dealt with by these */
1442 if (UTF_PATTERN || utf8_target) {
1443 utf8_fold_flags = 0;
1444 goto do_exactf_utf8;
1446 fold_array = PL_fold_latin1;
1447 folder = foldEQ_latin1;
1448 /* XXX This uses the full utf8 fold because if the pattern contains
1449 * 'ss' it could match LATIN_SMALL_LETTER SHARP_S in the string.
1450 * There could be a new node type, say EXACTFU_SS, which is
1451 * generated by regcomp only if there is an 'ss', and then every
1452 * other case could goto do_exactf_non_utf8;*/
1453 goto do_exactf_utf8;
1456 if (UTF_PATTERN || utf8_target) {
1457 utf8_fold_flags = 0;
1458 goto do_exactf_utf8;
1460 fold_array = PL_fold;
1462 goto do_exactf_non_utf8;
1465 if (UTF_PATTERN || utf8_target) {
1466 utf8_fold_flags = FOLDEQ_UTF8_LOCALE;
1467 goto do_exactf_utf8;
1469 fold_array = PL_fold_locale;
1470 folder = foldEQ_locale;
1474 do_exactf_non_utf8: /* Neither pattern nor string are UTF8 */
1476 /* The idea in the non-utf8 EXACTF* cases is to first find the
1477 * first character of the EXACTF* node and then, if necessary,
1478 * case-insensitively compare the full text of the node. c1 is the
1479 * first character. c2 is its fold. This logic will not work for
1480 * Unicode semantics and the german sharp ss, which hence should
1481 * not be compiled into a node that gets here. */
1482 pat_string = STRING(c);
1483 ln = STR_LEN(c); /* length to match in octets/bytes */
1485 e = HOP3c(strend, -((I32)ln), s);
1487 if (!reginfo && e < s) {
1488 e = s; /* Due to minlen logic of intuit() */
1492 c2 = fold_array[c1];
1493 if (c1 == c2) { /* If char and fold are the same */
1494 REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1);
1497 REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1 || *(U8*)s == c2);
1503 /* If one of the operands is in utf8, we can't use the simpler
1504 * folding above, due to the fact that many different characters
1505 * can have the same fold, or portion of a fold, or different-
1507 pat_string = STRING(c);
1508 ln = STR_LEN(c); /* length to match in octets/bytes */
1509 pat_end = pat_string + ln;
1510 lnc = (UTF_PATTERN) /* length to match in characters */
1511 ? utf8_length((U8 *) pat_string, (U8 *) pat_end)
1514 e = HOP3c(strend, -((I32)lnc), s);
1516 if (!reginfo && e < s) {
1517 e = s; /* Due to minlen logic of intuit() */
1521 char *my_strend= (char *)strend;
1522 if (foldEQ_utf8_flags(s, &my_strend, 0, utf8_target,
1523 pat_string, NULL, ln, cBOOL(UTF_PATTERN), utf8_fold_flags)
1524 && (!reginfo || regtry(reginfo, &s)) )
1532 PL_reg_flags |= RF_tainted;
1533 FBC_BOUND(isALNUM_LC,
1534 isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp)),
1535 isALNUM_LC_utf8((U8*)s));
1538 PL_reg_flags |= RF_tainted;
1539 FBC_NBOUND(isALNUM_LC,
1540 isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp)),
1541 isALNUM_LC_utf8((U8*)s));
1544 FBC_BOUND(isWORDCHAR,
1546 cBOOL(swash_fetch(PL_utf8_alnum, (U8*)s, utf8_target)));
1549 FBC_BOUND_NOLOAD(isWORDCHAR_A,
1551 isWORDCHAR_A((U8*)s));
1554 FBC_NBOUND(isWORDCHAR,
1556 cBOOL(swash_fetch(PL_utf8_alnum, (U8*)s, utf8_target)));
1559 FBC_NBOUND_NOLOAD(isWORDCHAR_A,
1561 isWORDCHAR_A((U8*)s));
1564 FBC_BOUND(isWORDCHAR_L1,
1566 cBOOL(swash_fetch(PL_utf8_alnum, (U8*)s, utf8_target)));
1569 FBC_NBOUND(isWORDCHAR_L1,
1571 cBOOL(swash_fetch(PL_utf8_alnum, (U8*)s, utf8_target)));
1574 REXEC_FBC_CSCAN_TAINT(
1575 isALNUM_LC_utf8((U8*)s),
1580 REXEC_FBC_CSCAN_PRELOAD(
1581 LOAD_UTF8_CHARCLASS_ALNUM(),
1582 swash_fetch(PL_utf8_alnum,(U8*)s, utf8_target),
1583 isWORDCHAR_L1((U8) *s)
1587 REXEC_FBC_CSCAN_PRELOAD(
1588 LOAD_UTF8_CHARCLASS_ALNUM(),
1589 swash_fetch(PL_utf8_alnum,(U8*)s, utf8_target),
1594 /* Don't need to worry about utf8, as it can match only a single
1595 * byte invariant character */
1596 REXEC_FBC_CLASS_SCAN( isWORDCHAR_A(*s));
1599 REXEC_FBC_CSCAN_PRELOAD(
1600 LOAD_UTF8_CHARCLASS_ALNUM(),
1601 !swash_fetch(PL_utf8_alnum,(U8*)s, utf8_target),
1602 ! isWORDCHAR_L1((U8) *s)
1606 REXEC_FBC_CSCAN_PRELOAD(
1607 LOAD_UTF8_CHARCLASS_ALNUM(),
1608 !swash_fetch(PL_utf8_alnum, (U8*)s, utf8_target),
1619 REXEC_FBC_CSCAN_TAINT(
1620 !isALNUM_LC_utf8((U8*)s),
1625 REXEC_FBC_CSCAN_PRELOAD(
1626 LOAD_UTF8_CHARCLASS_SPACE(),
1627 *s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, utf8_target),
1632 REXEC_FBC_CSCAN_PRELOAD(
1633 LOAD_UTF8_CHARCLASS_SPACE(),
1634 *s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, utf8_target),
1639 /* Don't need to worry about utf8, as it can match only a single
1640 * byte invariant character */
1641 REXEC_FBC_CLASS_SCAN( isSPACE_A(*s));
1644 REXEC_FBC_CSCAN_TAINT(
1645 isSPACE_LC_utf8((U8*)s),
1650 REXEC_FBC_CSCAN_PRELOAD(
1651 LOAD_UTF8_CHARCLASS_SPACE(),
1652 !( *s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, utf8_target)),
1653 ! isSPACE_L1((U8) *s)
1657 REXEC_FBC_CSCAN_PRELOAD(
1658 LOAD_UTF8_CHARCLASS_SPACE(),
1659 !(*s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, utf8_target)),
1670 REXEC_FBC_CSCAN_TAINT(
1671 !isSPACE_LC_utf8((U8*)s),
1676 REXEC_FBC_CSCAN_PRELOAD(
1677 LOAD_UTF8_CHARCLASS_DIGIT(),
1678 swash_fetch(PL_utf8_digit,(U8*)s, utf8_target),
1683 /* Don't need to worry about utf8, as it can match only a single
1684 * byte invariant character */
1685 REXEC_FBC_CLASS_SCAN( isDIGIT_A(*s));
1688 REXEC_FBC_CSCAN_TAINT(
1689 isDIGIT_LC_utf8((U8*)s),
1694 REXEC_FBC_CSCAN_PRELOAD(
1695 LOAD_UTF8_CHARCLASS_DIGIT(),
1696 !swash_fetch(PL_utf8_digit,(U8*)s, utf8_target),
1707 REXEC_FBC_CSCAN_TAINT(
1708 !isDIGIT_LC_utf8((U8*)s),
1715 is_LNBREAK_latin1(s)
1727 !is_VERTWS_latin1(s)
1733 is_HORIZWS_latin1(s)
1738 !is_HORIZWS_utf8(s),
1739 !is_HORIZWS_latin1(s)
1746 /* what trie are we using right now */
1748 = (reg_ac_data*)progi->data->data[ ARG( c ) ];
1750 = (reg_trie_data*)progi->data->data[ aho->trie ];
1751 HV *widecharmap = MUTABLE_HV(progi->data->data[ aho->trie + 1 ]);
1753 const char *last_start = strend - trie->minlen;
1755 const char *real_start = s;
1757 STRLEN maxlen = trie->maxlen;
1759 U8 **points; /* map of where we were in the input string
1760 when reading a given char. For ASCII this
1761 is unnecessary overhead as the relationship
1762 is always 1:1, but for Unicode, especially
1763 case folded Unicode this is not true. */
1764 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1768 GET_RE_DEBUG_FLAGS_DECL;
1770 /* We can't just allocate points here. We need to wrap it in
1771 * an SV so it gets freed properly if there is a croak while
1772 * running the match */
1775 sv_points=newSV(maxlen * sizeof(U8 *));
1776 SvCUR_set(sv_points,
1777 maxlen * sizeof(U8 *));
1778 SvPOK_on(sv_points);
1779 sv_2mortal(sv_points);
1780 points=(U8**)SvPV_nolen(sv_points );
1781 if ( trie_type != trie_utf8_fold
1782 && (trie->bitmap || OP(c)==AHOCORASICKC) )
1785 bitmap=(U8*)trie->bitmap;
1787 bitmap=(U8*)ANYOF_BITMAP(c);
1789 /* this is the Aho-Corasick algorithm modified a touch
1790 to include special handling for long "unknown char"
1791 sequences. The basic idea being that we use AC as long
1792 as we are dealing with a possible matching char, when
1793 we encounter an unknown char (and we have not encountered
1794 an accepting state) we scan forward until we find a legal
1796 AC matching is basically that of trie matching, except
1797 that when we encounter a failing transition, we fall back
1798 to the current states "fail state", and try the current char
1799 again, a process we repeat until we reach the root state,
1800 state 1, or a legal transition. If we fail on the root state
1801 then we can either terminate if we have reached an accepting
1802 state previously, or restart the entire process from the beginning
1806 while (s <= last_start) {
1807 const U32 uniflags = UTF8_ALLOW_DEFAULT;
1815 U8 *uscan = (U8*)NULL;
1816 U8 *leftmost = NULL;
1818 U32 accepted_word= 0;
1822 while ( state && uc <= (U8*)strend ) {
1824 U32 word = aho->states[ state ].wordnum;
1828 DEBUG_TRIE_EXECUTE_r(
1829 if ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) {
1830 dump_exec_pos( (char *)uc, c, strend, real_start,
1831 (char *)uc, utf8_target );
1832 PerlIO_printf( Perl_debug_log,
1833 " Scanning for legal start char...\n");
1837 while ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) {
1841 while ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) {
1847 if (uc >(U8*)last_start) break;
1851 U8 *lpos= points[ (pointpos - trie->wordinfo[word].len) % maxlen ];
1852 if (!leftmost || lpos < leftmost) {
1853 DEBUG_r(accepted_word=word);
1859 points[pointpos++ % maxlen]= uc;
1860 REXEC_TRIE_READ_CHAR(trie_type, trie, widecharmap, uc,
1861 uscan, len, uvc, charid, foldlen,
1863 DEBUG_TRIE_EXECUTE_r({
1864 dump_exec_pos( (char *)uc, c, strend, real_start,
1866 PerlIO_printf(Perl_debug_log,
1867 " Charid:%3u CP:%4"UVxf" ",
1873 word = aho->states[ state ].wordnum;
1875 base = aho->states[ state ].trans.base;
1877 DEBUG_TRIE_EXECUTE_r({
1879 dump_exec_pos( (char *)uc, c, strend, real_start,
1881 PerlIO_printf( Perl_debug_log,
1882 "%sState: %4"UVxf", word=%"UVxf,
1883 failed ? " Fail transition to " : "",
1884 (UV)state, (UV)word);
1890 ( ((offset = base + charid
1891 - 1 - trie->uniquecharcount)) >= 0)
1892 && ((U32)offset < trie->lasttrans)
1893 && trie->trans[offset].check == state
1894 && (tmp=trie->trans[offset].next))
1896 DEBUG_TRIE_EXECUTE_r(
1897 PerlIO_printf( Perl_debug_log," - legal\n"));
1902 DEBUG_TRIE_EXECUTE_r(
1903 PerlIO_printf( Perl_debug_log," - fail\n"));
1905 state = aho->fail[state];
1909 /* we must be accepting here */
1910 DEBUG_TRIE_EXECUTE_r(
1911 PerlIO_printf( Perl_debug_log," - accepting\n"));
1920 if (!state) state = 1;
1923 if ( aho->states[ state ].wordnum ) {
1924 U8 *lpos = points[ (pointpos - trie->wordinfo[aho->states[ state ].wordnum].len) % maxlen ];
1925 if (!leftmost || lpos < leftmost) {
1926 DEBUG_r(accepted_word=aho->states[ state ].wordnum);
1931 s = (char*)leftmost;
1932 DEBUG_TRIE_EXECUTE_r({
1934 Perl_debug_log,"Matches word #%"UVxf" at position %"IVdf". Trying full pattern...\n",
1935 (UV)accepted_word, (IV)(s - real_start)
1938 if (!reginfo || regtry(reginfo, &s)) {
1944 DEBUG_TRIE_EXECUTE_r({
1945 PerlIO_printf( Perl_debug_log,"Pattern failed. Looking for new start point...\n");
1948 DEBUG_TRIE_EXECUTE_r(
1949 PerlIO_printf( Perl_debug_log,"No match.\n"));
1958 Perl_croak(aTHX_ "panic: unknown regstclass %d", (int)OP(c));
1968 - regexec_flags - match a regexp against a string
1971 Perl_regexec_flags(pTHX_ REGEXP * const rx, char *stringarg, register char *strend,
1972 char *strbeg, I32 minend, SV *sv, void *data, U32 flags)
1973 /* strend: pointer to null at end of string */
1974 /* strbeg: real beginning of string */
1975 /* minend: end of match must be >=minend after stringarg. */
1976 /* data: May be used for some additional optimizations.
1977 Currently its only used, with a U32 cast, for transmitting
1978 the ganch offset when doing a /g match. This will change */
1979 /* nosave: For optimizations. */
1982 struct regexp *const prog = (struct regexp *)SvANY(rx);
1983 /*register*/ char *s;
1984 register regnode *c;
1985 /*register*/ char *startpos = stringarg;
1986 I32 minlen; /* must match at least this many chars */
1987 I32 dontbother = 0; /* how many characters not to try at end */
1988 I32 end_shift = 0; /* Same for the end. */ /* CC */
1989 I32 scream_pos = -1; /* Internal iterator of scream. */
1990 char *scream_olds = NULL;
1991 const bool utf8_target = cBOOL(DO_UTF8(sv));
1993 RXi_GET_DECL(prog,progi);
1994 regmatch_info reginfo; /* create some info to pass to regtry etc */
1995 regexp_paren_pair *swap = NULL;
1996 GET_RE_DEBUG_FLAGS_DECL;
1998 PERL_ARGS_ASSERT_REGEXEC_FLAGS;
1999 PERL_UNUSED_ARG(data);
2001 /* Be paranoid... */
2002 if (prog == NULL || startpos == NULL) {
2003 Perl_croak(aTHX_ "NULL regexp parameter");
2007 multiline = prog->extflags & RXf_PMf_MULTILINE;
2008 reginfo.prog = rx; /* Yes, sorry that this is confusing. */
2010 RX_MATCH_UTF8_set(rx, utf8_target);
2012 debug_start_match(rx, utf8_target, startpos, strend,
2016 minlen = prog->minlen;
2018 if (strend - startpos < (minlen+(prog->check_offset_min<0?prog->check_offset_min:0))) {
2019 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
2020 "String too short [regexec_flags]...\n"));
2025 /* Check validity of program. */
2026 if (UCHARAT(progi->program) != REG_MAGIC) {
2027 Perl_croak(aTHX_ "corrupted regexp program");
2031 PL_reg_eval_set = 0;
2035 PL_reg_flags |= RF_utf8;
2037 /* Mark beginning of line for ^ and lookbehind. */
2038 reginfo.bol = startpos; /* XXX not used ??? */
2042 /* Mark end of line for $ (and such) */
2045 /* see how far we have to get to not match where we matched before */
2046 reginfo.till = startpos+minend;
2048 /* If there is a "must appear" string, look for it. */
2051 if (prog->extflags & RXf_GPOS_SEEN) { /* Need to set reginfo->ganch */
2053 if (flags & REXEC_IGNOREPOS){ /* Means: check only at start */
2054 reginfo.ganch = startpos + prog->gofs;
2055 DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
2056 "GPOS IGNOREPOS: reginfo.ganch = startpos + %"UVxf"\n",(UV)prog->gofs));
2057 } else if (sv && SvTYPE(sv) >= SVt_PVMG
2059 && (mg = mg_find(sv, PERL_MAGIC_regex_global))
2060 && mg->mg_len >= 0) {
2061 reginfo.ganch = strbeg + mg->mg_len; /* Defined pos() */
2062 DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
2063 "GPOS MAGIC: reginfo.ganch = strbeg + %"IVdf"\n",(IV)mg->mg_len));
2065 if (prog->extflags & RXf_ANCH_GPOS) {
2066 if (s > reginfo.ganch)
2068 s = reginfo.ganch - prog->gofs;
2069 DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
2070 "GPOS ANCH_GPOS: s = ganch - %"UVxf"\n",(UV)prog->gofs));
2076 reginfo.ganch = strbeg + PTR2UV(data);
2077 DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
2078 "GPOS DATA: reginfo.ganch= strbeg + %"UVxf"\n",PTR2UV(data)));
2080 } else { /* pos() not defined */
2081 reginfo.ganch = strbeg;
2082 DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
2083 "GPOS: reginfo.ganch = strbeg\n"));
2086 if (PL_curpm && (PM_GETRE(PL_curpm) == rx)) {
2087 /* We have to be careful. If the previous successful match
2088 was from this regex we don't want a subsequent partially
2089 successful match to clobber the old results.
2090 So when we detect this possibility we add a swap buffer
2091 to the re, and switch the buffer each match. If we fail
2092 we switch it back, otherwise we leave it swapped.
2095 /* do we need a save destructor here for eval dies? */
2096 Newxz(prog->offs, (prog->nparens + 1), regexp_paren_pair);
2098 if (!(flags & REXEC_CHECKED) && (prog->check_substr != NULL || prog->check_utf8 != NULL)) {
2099 re_scream_pos_data d;
2101 d.scream_olds = &scream_olds;
2102 d.scream_pos = &scream_pos;
2103 s = re_intuit_start(rx, sv, s, strend, flags, &d);
2105 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Not present...\n"));
2106 goto phooey; /* not present */
2112 /* Simplest case: anchored match need be tried only once. */
2113 /* [unless only anchor is BOL and multiline is set] */
2114 if (prog->extflags & (RXf_ANCH & ~RXf_ANCH_GPOS)) {
2115 if (s == startpos && regtry(®info, &startpos))
2117 else if (multiline || (prog->intflags & PREGf_IMPLICIT)
2118 || (prog->extflags & RXf_ANCH_MBOL)) /* XXXX SBOL? */
2123 dontbother = minlen - 1;
2124 end = HOP3c(strend, -dontbother, strbeg) - 1;
2125 /* for multiline we only have to try after newlines */
2126 if (prog->check_substr || prog->check_utf8) {
2127 /* because of the goto we can not easily reuse the macros for bifurcating the
2128 unicode/non-unicode match modes here like we do elsewhere - demerphq */
2131 goto after_try_utf8;
2133 if (regtry(®info, &s)) {
2140 if (prog->extflags & RXf_USE_INTUIT) {
2141 s = re_intuit_start(rx, sv, s + UTF8SKIP(s), strend, flags, NULL);
2150 } /* end search for check string in unicode */
2152 if (s == startpos) {
2153 goto after_try_latin;
2156 if (regtry(®info, &s)) {
2163 if (prog->extflags & RXf_USE_INTUIT) {
2164 s = re_intuit_start(rx, sv, s + 1, strend, flags, NULL);
2173 } /* end search for check string in latin*/
2174 } /* end search for check string */
2175 else { /* search for newline */
2177 /*XXX: The s-- is almost definitely wrong here under unicode - demeprhq*/
2180 /* We can use a more efficient search as newlines are the same in unicode as they are in latin */
2182 if (*s++ == '\n') { /* don't need PL_utf8skip here */
2183 if (regtry(®info, &s))
2187 } /* end search for newline */
2188 } /* end anchored/multiline check string search */
2190 } else if (RXf_GPOS_CHECK == (prog->extflags & RXf_GPOS_CHECK))
2192 /* the warning about reginfo.ganch being used without initialization
2193 is bogus -- we set it above, when prog->extflags & RXf_GPOS_SEEN
2194 and we only enter this block when the same bit is set. */
2195 char *tmp_s = reginfo.ganch - prog->gofs;
2197 if (tmp_s >= strbeg && regtry(®info, &tmp_s))
2202 /* Messy cases: unanchored match. */
2203 if ((prog->anchored_substr || prog->anchored_utf8) && prog->intflags & PREGf_SKIP) {
2204 /* we have /x+whatever/ */
2205 /* it must be a one character string (XXXX Except UTF_PATTERN?) */
2210 if (!(utf8_target ? prog->anchored_utf8 : prog->anchored_substr))
2211 utf8_target ? to_utf8_substr(prog) : to_byte_substr(prog);
2212 ch = SvPVX_const(utf8_target ? prog->anchored_utf8 : prog->anchored_substr)[0];
2217 DEBUG_EXECUTE_r( did_match = 1 );
2218 if (regtry(®info, &s)) goto got_it;
2220 while (s < strend && *s == ch)
2228 DEBUG_EXECUTE_r( did_match = 1 );
2229 if (regtry(®info, &s)) goto got_it;
2231 while (s < strend && *s == ch)
2236 DEBUG_EXECUTE_r(if (!did_match)
2237 PerlIO_printf(Perl_debug_log,
2238 "Did not find anchored character...\n")
2241 else if (prog->anchored_substr != NULL
2242 || prog->anchored_utf8 != NULL
2243 || ((prog->float_substr != NULL || prog->float_utf8 != NULL)
2244 && prog->float_max_offset < strend - s)) {
2249 char *last1; /* Last position checked before */
2253 if (prog->anchored_substr || prog->anchored_utf8) {
2254 if (!(utf8_target ? prog->anchored_utf8 : prog->anchored_substr))
2255 utf8_target ? to_utf8_substr(prog) : to_byte_substr(prog);
2256 must = utf8_target ? prog->anchored_utf8 : prog->anchored_substr;
2257 back_max = back_min = prog->anchored_offset;
2259 if (!(utf8_target ? prog->float_utf8 : prog->float_substr))
2260 utf8_target ? to_utf8_substr(prog) : to_byte_substr(prog);
2261 must = utf8_target ? prog->float_utf8 : prog->float_substr;
2262 back_max = prog->float_max_offset;
2263 back_min = prog->float_min_offset;
2267 if (must == &PL_sv_undef)
2268 /* could not downgrade utf8 check substring, so must fail */
2274 last = HOP3c(strend, /* Cannot start after this */
2275 -(I32)(CHR_SVLEN(must)
2276 - (SvTAIL(must) != 0) + back_min), strbeg);
2279 last1 = HOPc(s, -1);
2281 last1 = s - 1; /* bogus */
2283 /* XXXX check_substr already used to find "s", can optimize if
2284 check_substr==must. */
2286 dontbother = end_shift;
2287 strend = HOPc(strend, -dontbother);
2288 while ( (s <= last) &&
2289 ((flags & REXEC_SCREAM)
2290 ? (s = screaminstr(sv, must, HOP3c(s, back_min, (back_min<0 ? strbeg : strend)) - strbeg,
2291 end_shift, &scream_pos, 0))
2292 : (s = fbm_instr((unsigned char*)HOP3(s, back_min, (back_min<0 ? strbeg : strend)),
2293 (unsigned char*)strend, must,
2294 multiline ? FBMrf_MULTILINE : 0))) ) {
2295 /* we may be pointing at the wrong string */
2296 if ((flags & REXEC_SCREAM) && RXp_MATCH_COPIED(prog))
2297 s = strbeg + (s - SvPVX_const(sv));
2298 DEBUG_EXECUTE_r( did_match = 1 );
2299 if (HOPc(s, -back_max) > last1) {
2300 last1 = HOPc(s, -back_min);
2301 s = HOPc(s, -back_max);
2304 char * const t = (last1 >= PL_bostr) ? HOPc(last1, 1) : last1 + 1;
2306 last1 = HOPc(s, -back_min);
2310 while (s <= last1) {
2311 if (regtry(®info, &s))
2317 while (s <= last1) {
2318 if (regtry(®info, &s))
2324 DEBUG_EXECUTE_r(if (!did_match) {
2325 RE_PV_QUOTED_DECL(quoted, utf8_target, PERL_DEBUG_PAD_ZERO(0),
2326 SvPVX_const(must), RE_SV_DUMPLEN(must), 30);
2327 PerlIO_printf(Perl_debug_log, "Did not find %s substr %s%s...\n",
2328 ((must == prog->anchored_substr || must == prog->anchored_utf8)
2329 ? "anchored" : "floating"),
2330 quoted, RE_SV_TAIL(must));
2334 else if ( (c = progi->regstclass) ) {
2336 const OPCODE op = OP(progi->regstclass);
2337 /* don't bother with what can't match */
2338 if (PL_regkind[op] != EXACT && op != CANY && PL_regkind[op] != TRIE)
2339 strend = HOPc(strend, -(minlen - 1));
2342 SV * const prop = sv_newmortal();
2343 regprop(prog, prop, c);
2345 RE_PV_QUOTED_DECL(quoted,utf8_target,PERL_DEBUG_PAD_ZERO(1),
2347 PerlIO_printf(Perl_debug_log,
2348 "Matching stclass %.*s against %s (%d bytes)\n",
2349 (int)SvCUR(prop), SvPVX_const(prop),
2350 quoted, (int)(strend - s));
2353 if (find_byclass(prog, c, s, strend, ®info))
2355 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Contradicts stclass... [regexec_flags]\n"));
2359 if (prog->float_substr != NULL || prog->float_utf8 != NULL) {
2364 if (!(utf8_target ? prog->float_utf8 : prog->float_substr))
2365 utf8_target ? to_utf8_substr(prog) : to_byte_substr(prog);
2366 float_real = utf8_target ? prog->float_utf8 : prog->float_substr;
2368 if (flags & REXEC_SCREAM) {
2369 last = screaminstr(sv, float_real, s - strbeg,
2370 end_shift, &scream_pos, 1); /* last one */
2372 last = scream_olds; /* Only one occurrence. */
2373 /* we may be pointing at the wrong string */
2374 else if (RXp_MATCH_COPIED(prog))
2375 s = strbeg + (s - SvPVX_const(sv));
2379 const char * const little = SvPV_const(float_real, len);
2381 if (SvTAIL(float_real)) {
2382 if (memEQ(strend - len + 1, little, len - 1))
2383 last = strend - len + 1;
2384 else if (!multiline)
2385 last = memEQ(strend - len, little, len)
2386 ? strend - len : NULL;
2392 last = rninstr(s, strend, little, little + len);
2394 last = strend; /* matching "$" */
2399 PerlIO_printf(Perl_debug_log,
2400 "%sCan't trim the tail, match fails (should not happen)%s\n",
2401 PL_colors[4], PL_colors[5]));
2402 goto phooey; /* Should not happen! */
2404 dontbother = strend - last + prog->float_min_offset;
2406 if (minlen && (dontbother < minlen))
2407 dontbother = minlen - 1;
2408 strend -= dontbother; /* this one's always in bytes! */
2409 /* We don't know much -- general case. */
2412 if (regtry(®info, &s))
2421 if (regtry(®info, &s))
2423 } while (s++ < strend);
2432 RX_MATCH_TAINTED_set(rx, PL_reg_flags & RF_tainted);
2434 if (PL_reg_eval_set)
2435 restore_pos(aTHX_ prog);
2436 if (RXp_PAREN_NAMES(prog))
2437 (void)hv_iterinit(RXp_PAREN_NAMES(prog));
2439 /* make sure $`, $&, $', and $digit will work later */
2440 if ( !(flags & REXEC_NOT_FIRST) ) {
2441 RX_MATCH_COPY_FREE(rx);
2442 if (flags & REXEC_COPY_STR) {
2443 const I32 i = PL_regeol - startpos + (stringarg - strbeg);
2444 #ifdef PERL_OLD_COPY_ON_WRITE
2446 || (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS)) {
2448 PerlIO_printf(Perl_debug_log,
2449 "Copy on write: regexp capture, type %d\n",
2452 prog->saved_copy = sv_setsv_cow(prog->saved_copy, sv);
2453 prog->subbeg = (char *)SvPVX_const(prog->saved_copy);
2454 assert (SvPOKp(prog->saved_copy));
2458 RX_MATCH_COPIED_on(rx);
2459 s = savepvn(strbeg, i);
2465 prog->subbeg = strbeg;
2466 prog->sublen = PL_regeol - strbeg; /* strend may have been modified */
2473 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch failed%s\n",
2474 PL_colors[4], PL_colors[5]));
2475 if (PL_reg_eval_set)
2476 restore_pos(aTHX_ prog);
2478 /* we failed :-( roll it back */
2479 Safefree(prog->offs);
2488 - regtry - try match at specific point
2490 STATIC I32 /* 0 failure, 1 success */
2491 S_regtry(pTHX_ regmatch_info *reginfo, char **startpos)
2495 REGEXP *const rx = reginfo->prog;
2496 regexp *const prog = (struct regexp *)SvANY(rx);
2497 RXi_GET_DECL(prog,progi);
2498 GET_RE_DEBUG_FLAGS_DECL;
2500 PERL_ARGS_ASSERT_REGTRY;
2502 reginfo->cutpoint=NULL;
2504 if ((prog->extflags & RXf_EVAL_SEEN) && !PL_reg_eval_set) {
2507 PL_reg_eval_set = RS_init;
2508 DEBUG_EXECUTE_r(DEBUG_s(
2509 PerlIO_printf(Perl_debug_log, " setting stack tmpbase at %"IVdf"\n",
2510 (IV)(PL_stack_sp - PL_stack_base));
2513 cxstack[cxstack_ix].blk_oldsp = PL_stack_sp - PL_stack_base;
2514 /* Otherwise OP_NEXTSTATE will free whatever on stack now. */
2516 /* Apparently this is not needed, judging by wantarray. */
2517 /* SAVEI8(cxstack[cxstack_ix].blk_gimme);
2518 cxstack[cxstack_ix].blk_gimme = G_SCALAR; */
2521 /* Make $_ available to executed code. */
2522 if (reginfo->sv != DEFSV) {
2524 DEFSV_set(reginfo->sv);
2527 if (!(SvTYPE(reginfo->sv) >= SVt_PVMG && SvMAGIC(reginfo->sv)
2528 && (mg = mg_find(reginfo->sv, PERL_MAGIC_regex_global)))) {
2529 /* prepare for quick setting of pos */
2530 #ifdef PERL_OLD_COPY_ON_WRITE
2531 if (SvIsCOW(reginfo->sv))
2532 sv_force_normal_flags(reginfo->sv, 0);
2534 mg = sv_magicext(reginfo->sv, NULL, PERL_MAGIC_regex_global,
2535 &PL_vtbl_mglob, NULL, 0);
2539 PL_reg_oldpos = mg->mg_len;
2540 SAVEDESTRUCTOR_X(restore_pos, prog);
2542 if (!PL_reg_curpm) {
2543 Newxz(PL_reg_curpm, 1, PMOP);
2546 SV* const repointer = &PL_sv_undef;
2547 /* this regexp is also owned by the new PL_reg_curpm, which
2548 will try to free it. */
2549 av_push(PL_regex_padav, repointer);
2550 PL_reg_curpm->op_pmoffset = av_len(PL_regex_padav);
2551 PL_regex_pad = AvARRAY(PL_regex_padav);
2556 /* It seems that non-ithreads works both with and without this code.
2557 So for efficiency reasons it seems best not to have the code
2558 compiled when it is not needed. */
2559 /* This is safe against NULLs: */
2560 ReREFCNT_dec(PM_GETRE(PL_reg_curpm));
2561 /* PM_reg_curpm owns a reference to this regexp. */
2562 (void)ReREFCNT_inc(rx);
2564 PM_SETRE(PL_reg_curpm, rx);
2565 PL_reg_oldcurpm = PL_curpm;
2566 PL_curpm = PL_reg_curpm;
2567 if (RXp_MATCH_COPIED(prog)) {
2568 /* Here is a serious problem: we cannot rewrite subbeg,
2569 since it may be needed if this match fails. Thus
2570 $` inside (?{}) could fail... */
2571 PL_reg_oldsaved = prog->subbeg;
2572 PL_reg_oldsavedlen = prog->sublen;
2573 #ifdef PERL_OLD_COPY_ON_WRITE
2574 PL_nrs = prog->saved_copy;
2576 RXp_MATCH_COPIED_off(prog);
2579 PL_reg_oldsaved = NULL;
2580 prog->subbeg = PL_bostr;
2581 prog->sublen = PL_regeol - PL_bostr; /* strend may have been modified */
2583 DEBUG_EXECUTE_r(PL_reg_starttry = *startpos);
2584 prog->offs[0].start = *startpos - PL_bostr;
2585 PL_reginput = *startpos;
2586 PL_reglastparen = &prog->lastparen;
2587 PL_reglastcloseparen = &prog->lastcloseparen;
2588 prog->lastparen = 0;
2589 prog->lastcloseparen = 0;
2591 PL_regoffs = prog->offs;
2592 if (PL_reg_start_tmpl <= prog->nparens) {
2593 PL_reg_start_tmpl = prog->nparens*3/2 + 3;
2594 if(PL_reg_start_tmp)
2595 Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*);
2597 Newx(PL_reg_start_tmp, PL_reg_start_tmpl, char*);
2600 /* XXXX What this code is doing here?!!! There should be no need
2601 to do this again and again, PL_reglastparen should take care of
2604 /* Tests pat.t#187 and split.t#{13,14} seem to depend on this code.
2605 * Actually, the code in regcppop() (which Ilya may be meaning by
2606 * PL_reglastparen), is not needed at all by the test suite
2607 * (op/regexp, op/pat, op/split), but that code is needed otherwise
2608 * this erroneously leaves $1 defined: "1" =~ /^(?:(\d)x)?\d$/
2609 * Meanwhile, this code *is* needed for the
2610 * above-mentioned test suite tests to succeed. The common theme
2611 * on those tests seems to be returning null fields from matches.
2612 * --jhi updated by dapm */
2614 if (prog->nparens) {
2615 regexp_paren_pair *pp = PL_regoffs;
2617 for (i = prog->nparens; i > (I32)*PL_reglastparen; i--) {
2625 if (regmatch(reginfo, progi->program + 1)) {
2626 PL_regoffs[0].end = PL_reginput - PL_bostr;
2629 if (reginfo->cutpoint)
2630 *startpos= reginfo->cutpoint;
2631 REGCP_UNWIND(lastcp);
2636 #define sayYES goto yes
2637 #define sayNO goto no
2638 #define sayNO_SILENT goto no_silent
2640 /* we dont use STMT_START/END here because it leads to
2641 "unreachable code" warnings, which are bogus, but distracting. */
2642 #define CACHEsayNO \
2643 if (ST.cache_mask) \
2644 PL_reg_poscache[ST.cache_offset] |= ST.cache_mask; \
2647 /* this is used to determine how far from the left messages like
2648 'failed...' are printed. It should be set such that messages
2649 are inline with the regop output that created them.
2651 #define REPORT_CODE_OFF 32
2654 #define CHRTEST_UNINIT -1001 /* c1/c2 haven't been calculated yet */
2655 #define CHRTEST_VOID -1000 /* the c1/c2 "next char" test should be skipped */
2657 #define SLAB_FIRST(s) (&(s)->states[0])
2658 #define SLAB_LAST(s) (&(s)->states[PERL_REGMATCH_SLAB_SLOTS-1])
2660 /* grab a new slab and return the first slot in it */
2662 STATIC regmatch_state *
2665 #if PERL_VERSION < 9 && !defined(PERL_CORE)
2668 regmatch_slab *s = PL_regmatch_slab->next;
2670 Newx(s, 1, regmatch_slab);
2671 s->prev = PL_regmatch_slab;
2673 PL_regmatch_slab->next = s;
2675 PL_regmatch_slab = s;
2676 return SLAB_FIRST(s);
2680 /* push a new state then goto it */
2682 #define PUSH_STATE_GOTO(state, node) \
2684 st->resume_state = state; \
2687 /* push a new state with success backtracking, then goto it */
2689 #define PUSH_YES_STATE_GOTO(state, node) \
2691 st->resume_state = state; \
2692 goto push_yes_state;
2698 regmatch() - main matching routine
2700 This is basically one big switch statement in a loop. We execute an op,
2701 set 'next' to point the next op, and continue. If we come to a point which
2702 we may need to backtrack to on failure such as (A|B|C), we push a
2703 backtrack state onto the backtrack stack. On failure, we pop the top
2704 state, and re-enter the loop at the state indicated. If there are no more
2705 states to pop, we return failure.
2707 Sometimes we also need to backtrack on success; for example /A+/, where
2708 after successfully matching one A, we need to go back and try to
2709 match another one; similarly for lookahead assertions: if the assertion
2710 completes successfully, we backtrack to the state just before the assertion
2711 and then carry on. In these cases, the pushed state is marked as
2712 'backtrack on success too'. This marking is in fact done by a chain of
2713 pointers, each pointing to the previous 'yes' state. On success, we pop to
2714 the nearest yes state, discarding any intermediate failure-only states.
2715 Sometimes a yes state is pushed just to force some cleanup code to be
2716 called at the end of a successful match or submatch; e.g. (??{$re}) uses
2717 it to free the inner regex.
2719 Note that failure backtracking rewinds the cursor position, while
2720 success backtracking leaves it alone.
2722 A pattern is complete when the END op is executed, while a subpattern
2723 such as (?=foo) is complete when the SUCCESS op is executed. Both of these
2724 ops trigger the "pop to last yes state if any, otherwise return true"
2727 A common convention in this function is to use A and B to refer to the two
2728 subpatterns (or to the first nodes thereof) in patterns like /A*B/: so A is
2729 the subpattern to be matched possibly multiple times, while B is the entire
2730 rest of the pattern. Variable and state names reflect this convention.
2732 The states in the main switch are the union of ops and failure/success of
2733 substates associated with with that op. For example, IFMATCH is the op
2734 that does lookahead assertions /(?=A)B/ and so the IFMATCH state means
2735 'execute IFMATCH'; while IFMATCH_A is a state saying that we have just
2736 successfully matched A and IFMATCH_A_fail is a state saying that we have
2737 just failed to match A. Resume states always come in pairs. The backtrack
2738 state we push is marked as 'IFMATCH_A', but when that is popped, we resume
2739 at IFMATCH_A or IFMATCH_A_fail, depending on whether we are backtracking
2740 on success or failure.
2742 The struct that holds a backtracking state is actually a big union, with
2743 one variant for each major type of op. The variable st points to the
2744 top-most backtrack struct. To make the code clearer, within each
2745 block of code we #define ST to alias the relevant union.
2747 Here's a concrete example of a (vastly oversimplified) IFMATCH
2753 #define ST st->u.ifmatch
2755 case IFMATCH: // we are executing the IFMATCH op, (?=A)B
2756 ST.foo = ...; // some state we wish to save
2758 // push a yes backtrack state with a resume value of
2759 // IFMATCH_A/IFMATCH_A_fail, then continue execution at the
2761 PUSH_YES_STATE_GOTO(IFMATCH_A, A);
2764 case IFMATCH_A: // we have successfully executed A; now continue with B
2766 bar = ST.foo; // do something with the preserved value
2769 case IFMATCH_A_fail: // A failed, so the assertion failed
2770 ...; // do some housekeeping, then ...
2771 sayNO; // propagate the failure
2778 For any old-timers reading this who are familiar with the old recursive
2779 approach, the code above is equivalent to:
2781 case IFMATCH: // we are executing the IFMATCH op, (?=A)B
2790 ...; // do some housekeeping, then ...
2791 sayNO; // propagate the failure
2794 The topmost backtrack state, pointed to by st, is usually free. If you
2795 want to claim it, populate any ST.foo fields in it with values you wish to
2796 save, then do one of
2798 PUSH_STATE_GOTO(resume_state, node);
2799 PUSH_YES_STATE_GOTO(resume_state, node);
2801 which sets that backtrack state's resume value to 'resume_state', pushes a
2802 new free entry to the top of the backtrack stack, then goes to 'node'.
2803 On backtracking, the free slot is popped, and the saved state becomes the
2804 new free state. An ST.foo field in this new top state can be temporarily
2805 accessed to retrieve values, but once the main loop is re-entered, it
2806 becomes available for reuse.
2808 Note that the depth of the backtrack stack constantly increases during the
2809 left-to-right execution of the pattern, rather than going up and down with
2810 the pattern nesting. For example the stack is at its maximum at Z at the
2811 end of the pattern, rather than at X in the following:
2813 /(((X)+)+)+....(Y)+....Z/
2815 The only exceptions to this are lookahead/behind assertions and the cut,
2816 (?>A), which pop all the backtrack states associated with A before
2819 Backtrack state structs are allocated in slabs of about 4K in size.
2820 PL_regmatch_state and st always point to the currently active state,
2821 and PL_regmatch_slab points to the slab currently containing
2822 PL_regmatch_state. The first time regmatch() is called, the first slab is
2823 allocated, and is never freed until interpreter destruction. When the slab
2824 is full, a new one is allocated and chained to the end. At exit from
2825 regmatch(), slabs allocated since entry are freed.
2830 #define DEBUG_STATE_pp(pp) \
2832 DUMP_EXEC_POS(locinput, scan, utf8_target); \
2833 PerlIO_printf(Perl_debug_log, \
2834 " %*s"pp" %s%s%s%s%s\n", \
2836 PL_reg_name[st->resume_state], \
2837 ((st==yes_state||st==mark_state) ? "[" : ""), \
2838 ((st==yes_state) ? "Y" : ""), \
2839 ((st==mark_state) ? "M" : ""), \
2840 ((st==yes_state||st==mark_state) ? "]" : "") \
2845 #define REG_NODE_NUM(x) ((x) ? (int)((x)-prog) : -1)
2850 S_debug_start_match(pTHX_ const REGEXP *prog, const bool utf8_target,
2851 const char *start, const char *end, const char *blurb)
2853 const bool utf8_pat = RX_UTF8(prog) ? 1 : 0;
2855 PERL_ARGS_ASSERT_DEBUG_START_MATCH;
2860 RE_PV_QUOTED_DECL(s0, utf8_pat, PERL_DEBUG_PAD_ZERO(0),
2861 RX_PRECOMP_const(prog), RX_PRELEN(prog), 60);
2863 RE_PV_QUOTED_DECL(s1, utf8_target, PERL_DEBUG_PAD_ZERO(1),
2864 start, end - start, 60);
2866 PerlIO_printf(Perl_debug_log,
2867 "%s%s REx%s %s against %s\n",
2868 PL_colors[4], blurb, PL_colors[5], s0, s1);
2870 if (utf8_target||utf8_pat)
2871 PerlIO_printf(Perl_debug_log, "UTF-8 %s%s%s...\n",
2872 utf8_pat ? "pattern" : "",
2873 utf8_pat && utf8_target ? " and " : "",
2874 utf8_target ? "string" : ""
2880 S_dump_exec_pos(pTHX_ const char *locinput,
2881 const regnode *scan,
2882 const char *loc_regeol,
2883 const char *loc_bostr,
2884 const char *loc_reg_starttry,
2885 const bool utf8_target)
2887 const int docolor = *PL_colors[0] || *PL_colors[2] || *PL_colors[4];
2888 const int taill = (docolor ? 10 : 7); /* 3 chars for "> <" */
2889 int l = (loc_regeol - locinput) > taill ? taill : (loc_regeol - locinput);
2890 /* The part of the string before starttry has one color
2891 (pref0_len chars), between starttry and current
2892 position another one (pref_len - pref0_len chars),
2893 after the current position the third one.
2894 We assume that pref0_len <= pref_len, otherwise we
2895 decrease pref0_len. */
2896 int pref_len = (locinput - loc_bostr) > (5 + taill) - l
2897 ? (5 + taill) - l : locinput - loc_bostr;
2900 PERL_ARGS_ASSERT_DUMP_EXEC_POS;
2902 while (utf8_target && UTF8_IS_CONTINUATION(*(U8*)(locinput - pref_len)))
2904 pref0_len = pref_len - (locinput - loc_reg_starttry);
2905 if (l + pref_len < (5 + taill) && l < loc_regeol - locinput)
2906 l = ( loc_regeol - locinput > (5 + taill) - pref_len
2907 ? (5 + taill) - pref_len : loc_regeol - locinput);
2908 while (utf8_target && UTF8_IS_CONTINUATION(*(U8*)(locinput + l)))
2912 if (pref0_len > pref_len)
2913 pref0_len = pref_len;
2915 const int is_uni = (utf8_target && OP(scan) != CANY) ? 1 : 0;
2917 RE_PV_COLOR_DECL(s0,len0,is_uni,PERL_DEBUG_PAD(0),
2918 (locinput - pref_len),pref0_len, 60, 4, 5);
2920 RE_PV_COLOR_DECL(s1,len1,is_uni,PERL_DEBUG_PAD(1),
2921 (locinput - pref_len + pref0_len),
2922 pref_len - pref0_len, 60, 2, 3);
2924 RE_PV_COLOR_DECL(s2,len2,is_uni,PERL_DEBUG_PAD(2),
2925 locinput, loc_regeol - locinput, 10, 0, 1);
2927 const STRLEN tlen=len0+len1+len2;
2928 PerlIO_printf(Perl_debug_log,
2929 "%4"IVdf" <%.*s%.*s%s%.*s>%*s|",
2930 (IV)(locinput - loc_bostr),
2933 (docolor ? "" : "> <"),
2935 (int)(tlen > 19 ? 0 : 19 - tlen),
2942 /* reg_check_named_buff_matched()
2943 * Checks to see if a named buffer has matched. The data array of
2944 * buffer numbers corresponding to the buffer is expected to reside
2945 * in the regexp->data->data array in the slot stored in the ARG() of
2946 * node involved. Note that this routine doesn't actually care about the
2947 * name, that information is not preserved from compilation to execution.
2948 * Returns the index of the leftmost defined buffer with the given name
2949 * or 0 if non of the buffers matched.
2952 S_reg_check_named_buff_matched(pTHX_ const regexp *rex, const regnode *scan)
2955 RXi_GET_DECL(rex,rexi);
2956 SV *sv_dat= MUTABLE_SV(rexi->data->data[ ARG( scan ) ]);
2957 I32 *nums=(I32*)SvPVX(sv_dat);
2959 PERL_ARGS_ASSERT_REG_CHECK_NAMED_BUFF_MATCHED;
2961 for ( n=0; n<SvIVX(sv_dat); n++ ) {
2962 if ((I32)*PL_reglastparen >= nums[n] &&
2963 PL_regoffs[nums[n]].end != -1)
2972 /* free all slabs above current one - called during LEAVE_SCOPE */
2975 S_clear_backtrack_stack(pTHX_ void *p)
2977 regmatch_slab *s = PL_regmatch_slab->next;
2982 PL_regmatch_slab->next = NULL;
2984 regmatch_slab * const osl = s;
2991 #define SETREX(Re1,Re2) \
2992 if (PL_reg_eval_set) PM_SETRE((PL_reg_curpm), (Re2)); \
2995 STATIC I32 /* 0 failure, 1 success */
2996 S_regmatch(pTHX_ regmatch_info *reginfo, regnode *prog)
2998 #if PERL_VERSION < 9 && !defined(PERL_CORE)
3002 register const bool utf8_target = PL_reg_match_utf8;
3003 const U32 uniflags = UTF8_ALLOW_DEFAULT;
3004 REGEXP *rex_sv = reginfo->prog;
3005 regexp *rex = (struct regexp *)SvANY(rex_sv);
3006 RXi_GET_DECL(rex,rexi);
3008 /* the current state. This is a cached copy of PL_regmatch_state */
3009 register regmatch_state *st;
3010 /* cache heavy used fields of st in registers */
3011 register regnode *scan;
3012 register regnode *next;
3013 register U32 n = 0; /* general value; init to avoid compiler warning */
3014 register I32 ln = 0; /* len or last; init to avoid compiler warning */
3015 register char *locinput = PL_reginput;
3016 register I32 nextchr; /* is always set to UCHARAT(locinput) */
3018 bool result = 0; /* return value of S_regmatch */
3019 int depth = 0; /* depth of backtrack stack */
3020 U32 nochange_depth = 0; /* depth of GOSUB recursion with nochange */
3021 const U32 max_nochange_depth =
3022 (3 * rex->nparens > MAX_RECURSE_EVAL_NOCHANGE_DEPTH) ?
3023 3 * rex->nparens : MAX_RECURSE_EVAL_NOCHANGE_DEPTH;
3024 regmatch_state *yes_state = NULL; /* state to pop to on success of
3026 /* mark_state piggy backs on the yes_state logic so that when we unwind
3027 the stack on success we can update the mark_state as we go */
3028 regmatch_state *mark_state = NULL; /* last mark state we have seen */
3029 regmatch_state *cur_eval = NULL; /* most recent EVAL_AB state */
3030 struct regmatch_state *cur_curlyx = NULL; /* most recent curlyx */
3032 bool no_final = 0; /* prevent failure from backtracking? */
3033 bool do_cutgroup = 0; /* no_final only until next branch/trie entry */
3034 char *startpoint = PL_reginput;
3035 SV *popmark = NULL; /* are we looking for a mark? */
3036 SV *sv_commit = NULL; /* last mark name seen in failure */
3037 SV *sv_yes_mark = NULL; /* last mark name we have seen
3038 during a successful match */
3039 U32 lastopen = 0; /* last open we saw */
3040 bool has_cutgroup = RX_HAS_CUTGROUP(rex) ? 1 : 0;
3041 SV* const oreplsv = GvSV(PL_replgv);
3042 /* these three flags are set by various ops to signal information to
3043 * the very next op. They have a useful lifetime of exactly one loop
3044 * iteration, and are not preserved or restored by state pushes/pops
3046 bool sw = 0; /* the condition value in (?(cond)a|b) */
3047 bool minmod = 0; /* the next "{n,m}" is a "{n,m}?" */
3048 int logical = 0; /* the following EVAL is:
3052 or the following IFMATCH/UNLESSM is:
3053 false: plain (?=foo)
3054 true: used as a condition: (?(?=foo))
3057 GET_RE_DEBUG_FLAGS_DECL;
3060 PERL_ARGS_ASSERT_REGMATCH;
3062 DEBUG_OPTIMISE_r( DEBUG_EXECUTE_r({
3063 PerlIO_printf(Perl_debug_log,"regmatch start\n");
3065 /* on first ever call to regmatch, allocate first slab */
3066 if (!PL_regmatch_slab) {
3067 Newx(PL_regmatch_slab, 1, regmatch_slab);
3068 PL_regmatch_slab->prev = NULL;
3069 PL_regmatch_slab->next = NULL;
3070 PL_regmatch_state = SLAB_FIRST(PL_regmatch_slab);
3073 oldsave = PL_savestack_ix;
3074 SAVEDESTRUCTOR_X(S_clear_backtrack_stack, NULL);
3075 SAVEVPTR(PL_regmatch_slab);
3076 SAVEVPTR(PL_regmatch_state);
3078 /* grab next free state slot */
3079 st = ++PL_regmatch_state;
3080 if (st > SLAB_LAST(PL_regmatch_slab))
3081 st = PL_regmatch_state = S_push_slab(aTHX);
3083 /* Note that nextchr is a byte even in UTF */
3084 nextchr = UCHARAT(locinput);
3086 while (scan != NULL) {
3089 SV * const prop = sv_newmortal();
3090 regnode *rnext=regnext(scan);
3091 DUMP_EXEC_POS( locinput, scan, utf8_target );
3092 regprop(rex, prop, scan);
3094 PerlIO_printf(Perl_debug_log,
3095 "%3"IVdf":%*s%s(%"IVdf")\n",
3096 (IV)(scan - rexi->program), depth*2, "",
3098 (PL_regkind[OP(scan)] == END || !rnext) ?
3099 0 : (IV)(rnext - rexi->program));
3102 next = scan + NEXT_OFF(scan);
3105 state_num = OP(scan);
3107 REH_CALL_EXEC_NODE_HOOK(rex, scan, reginfo, st);
3110 assert(PL_reglastparen == &rex->lastparen);
3111 assert(PL_reglastcloseparen == &rex->lastcloseparen);
3112 assert(PL_regoffs == rex->offs);
3114 switch (state_num) {
3116 if (locinput == PL_bostr)
3118 /* reginfo->till = reginfo->bol; */
3123 if (locinput == PL_bostr ||
3124 ((nextchr || locinput < PL_regeol) && locinput[-1] == '\n'))
3130 if (locinput == PL_bostr)
3134 if (locinput == reginfo->ganch)
3139 /* update the startpoint */
3140 st->u.keeper.val = PL_regoffs[0].start;
3141 PL_reginput = locinput;
3142 PL_regoffs[0].start = locinput - PL_bostr;
3143 PUSH_STATE_GOTO(KEEPS_next, next);
3145 case KEEPS_next_fail:
3146 /* rollback the start point change */
3147 PL_regoffs[0].start = st->u.keeper.val;
3153 if ((nextchr || locinput < PL_regeol) && nextchr != '\n')
3158 if ((nextchr || locinput < PL_regeol) && nextchr != '\n')
3160 if (PL_regeol - locinput > 1)
3164 if (PL_regeol != locinput)
3168 if (!nextchr && locinput >= PL_regeol)
3171 locinput += PL_utf8skip[nextchr];
3172 if (locinput > PL_regeol)
3174 nextchr = UCHARAT(locinput);
3177 nextchr = UCHARAT(++locinput);
3180 if (!nextchr && locinput >= PL_regeol)
3182 nextchr = UCHARAT(++locinput);
3185 if ((!nextchr && locinput >= PL_regeol) || nextchr == '\n')
3188 locinput += PL_utf8skip[nextchr];
3189 if (locinput > PL_regeol)
3191 nextchr = UCHARAT(locinput);
3194 nextchr = UCHARAT(++locinput);
3198 #define ST st->u.trie
3200 /* In this case the charclass data is available inline so
3201 we can fail fast without a lot of extra overhead.
3203 if (scan->flags == EXACT || !utf8_target) {
3204 if(!ANYOF_BITMAP_TEST(scan, *locinput)) {
3206 PerlIO_printf(Perl_debug_log,
3207 "%*s %sfailed to match trie start class...%s\n",
3208 REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5])
3216 /* the basic plan of execution of the trie is:
3217 * At the beginning, run though all the states, and
3218 * find the longest-matching word. Also remember the position
3219 * of the shortest matching word. For example, this pattern:
3222 * when matched against the string "abcde", will generate
3223 * accept states for all words except 3, with the longest
3224 * matching word being 4, and the shortest being 1 (with
3225 * the position being after char 1 of the string).
3227 * Then for each matching word, in word order (i.e. 1,2,4,5),
3228 * we run the remainder of the pattern; on each try setting
3229 * the current position to the character following the word,
3230 * returning to try the next word on failure.
3232 * We avoid having to build a list of words at runtime by
3233 * using a compile-time structure, wordinfo[].prev, which
3234 * gives, for each word, the previous accepting word (if any).
3235 * In the case above it would contain the mappings 1->2, 2->0,
3236 * 3->0, 4->5, 5->1. We can use this table to generate, from
3237 * the longest word (4 above), a list of all words, by
3238 * following the list of prev pointers; this gives us the
3239 * unordered list 4,5,1,2. Then given the current word we have
3240 * just tried, we can go through the list and find the
3241 * next-biggest word to try (so if we just failed on word 2,
3242 * the next in the list is 4).
3244 * Since at runtime we don't record the matching position in
3245 * the string for each word, we have to work that out for
3246 * each word we're about to process. The wordinfo table holds
3247 * the character length of each word; given that we recorded
3248 * at the start: the position of the shortest word and its
3249 * length in chars, we just need to move the pointer the
3250 * difference between the two char lengths. Depending on
3251 * Unicode status and folding, that's cheap or expensive.
3253 * This algorithm is optimised for the case where are only a
3254 * small number of accept states, i.e. 0,1, or maybe 2.
3255 * With lots of accepts states, and having to try all of them,
3256 * it becomes quadratic on number of accept states to find all
3261 /* what type of TRIE am I? (utf8 makes this contextual) */
3262 DECL_TRIE_TYPE(scan);
3264 /* what trie are we using right now */
3265 reg_trie_data * const trie
3266 = (reg_trie_data*)rexi->data->data[ ARG( scan ) ];
3267 HV * widecharmap = MUTABLE_HV(rexi->data->data[ ARG( scan ) + 1 ]);
3268 U32 state = trie->startstate;
3270 if (trie->bitmap && trie_type != trie_utf8_fold &&
3271 !TRIE_BITMAP_TEST(trie,*locinput)
3273 if (trie->states[ state ].wordnum) {
3275 PerlIO_printf(Perl_debug_log,
3276 "%*s %smatched empty string...%s\n",
3277 REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5])
3283 PerlIO_printf(Perl_debug_log,
3284 "%*s %sfailed to match trie start class...%s\n",
3285 REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5])
3292 U8 *uc = ( U8* )locinput;
3296 U8 *uscan = (U8*)NULL;
3297 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
3298 U32 charcount = 0; /* how many input chars we have matched */
3299 U32 accepted = 0; /* have we seen any accepting states? */
3302 ST.jump = trie->jump;
3305 ST.longfold = FALSE; /* char longer if folded => it's harder */
3308 /* fully traverse the TRIE; note the position of the
3309 shortest accept state and the wordnum of the longest
3312 while ( state && uc <= (U8*)PL_regeol ) {
3313 U32 base = trie->states[ state ].trans.base;
3317 wordnum = trie->states[ state ].wordnum;
3319 if (wordnum) { /* it's an accept state */
3322 /* record first match position */
3324 ST.firstpos = (U8*)locinput;
3329 ST.firstchars = charcount;
3332 if (!ST.nextword || wordnum < ST.nextword)
3333 ST.nextword = wordnum;
3334 ST.topword = wordnum;
3337 DEBUG_TRIE_EXECUTE_r({
3338 DUMP_EXEC_POS( (char *)uc, scan, utf8_target );
3339 PerlIO_printf( Perl_debug_log,
3340 "%*s %sState: %4"UVxf" Accepted: %c ",
3341 2+depth * 2, "", PL_colors[4],
3342 (UV)state, (accepted ? 'Y' : 'N'));
3345 /* read a char and goto next state */
3348 REXEC_TRIE_READ_CHAR(trie_type, trie, widecharmap, uc,
3349 uscan, len, uvc, charid, foldlen,
3356 base + charid - 1 - trie->uniquecharcount)) >= 0)
3358 && ((U32)offset < trie->lasttrans)
3359 && trie->trans[offset].check == state)
3361 state = trie->trans[offset].next;
3372 DEBUG_TRIE_EXECUTE_r(
3373 PerlIO_printf( Perl_debug_log,
3374 "Charid:%3x CP:%4"UVxf" After State: %4"UVxf"%s\n",
3375 charid, uvc, (UV)state, PL_colors[5] );
3381 /* calculate total number of accept states */
3386 w = trie->wordinfo[w].prev;
3389 ST.accepted = accepted;
3393 PerlIO_printf( Perl_debug_log,
3394 "%*s %sgot %"IVdf" possible matches%s\n",
3395 REPORT_CODE_OFF + depth * 2, "",
3396 PL_colors[4], (IV)ST.accepted, PL_colors[5] );
3398 goto trie_first_try; /* jump into the fail handler */
3402 case TRIE_next_fail: /* we failed - try next alternative */
3404 REGCP_UNWIND(ST.cp);
3405 for (n = *PL_reglastparen; n > ST.lastparen; n--)
3406 PL_regoffs[n].end = -1;
3407 *PL_reglastparen = n;
3409 if (!--ST.accepted) {
3411 PerlIO_printf( Perl_debug_log,
3412 "%*s %sTRIE failed...%s\n",
3413 REPORT_CODE_OFF+depth*2, "",
3420 /* Find next-highest word to process. Note that this code
3421 * is O(N^2) per trie run (O(N) per branch), so keep tight */
3422 register U16 min = 0;
3424 register U16 const nextword = ST.nextword;
3425 register reg_trie_wordinfo * const wordinfo
3426 = ((reg_trie_data*)rexi->data->data[ARG(ST.me)])->wordinfo;
3427 for (word=ST.topword; word; word=wordinfo[word].prev) {
3428 if (word > nextword && (!min || word < min))
3441 ST.lastparen = *PL_reglastparen;
3445 /* find start char of end of current word */
3447 U32 chars; /* how many chars to skip */
3448 U8 *uc = ST.firstpos;
3449 reg_trie_data * const trie
3450 = (reg_trie_data*)rexi->data->data[ARG(ST.me)];
3452 assert((trie->wordinfo[ST.nextword].len - trie->prefixlen)
3454 chars = (trie->wordinfo[ST.nextword].len - trie->prefixlen)
3458 /* the hard option - fold each char in turn and find
3459 * its folded length (which may be different */
3460 U8 foldbuf[UTF8_MAXBYTES_CASE + 1];
3468 uvc = utf8n_to_uvuni((U8*)uc, UTF8_MAXLEN, &len,
3476 uvc = to_uni_fold(uvc, foldbuf, &foldlen);
3481 uvc = utf8n_to_uvuni(uscan, UTF8_MAXLEN, &len,
3495 PL_reginput = (char *)uc;
3498 scan = (ST.jump && ST.jump[ST.nextword])
3499 ? ST.me + ST.jump[ST.nextword]
3503 PerlIO_printf( Perl_debug_log,
3504 "%*s %sTRIE matched word #%d, continuing%s\n",
3505 REPORT_CODE_OFF+depth*2, "",
3512 if (ST.accepted > 1 || has_cutgroup) {
3513 PUSH_STATE_GOTO(TRIE_next, scan);
3516 /* only one choice left - just continue */
3518 AV *const trie_words
3519 = MUTABLE_AV(rexi->data->data[ARG(ST.me)+TRIE_WORDS_OFFSET]);
3520 SV ** const tmp = av_fetch( trie_words,
3522 SV *sv= tmp ? sv_newmortal() : NULL;
3524 PerlIO_printf( Perl_debug_log,
3525 "%*s %sonly one match left, short-circuiting: #%d <%s>%s\n",
3526 REPORT_CODE_OFF+depth*2, "", PL_colors[4],
3528 tmp ? pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), 0,
3529 PL_colors[0], PL_colors[1],
3530 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0)|PERL_PV_ESCAPE_NONASCII
3532 : "not compiled under -Dr",
3536 locinput = PL_reginput;
3537 nextchr = UCHARAT(locinput);
3538 continue; /* execute rest of RE */
3543 char *s = STRING(scan);
3545 if (utf8_target != UTF_PATTERN) {
3546 /* The target and the pattern have differing utf8ness. */
3548 const char * const e = s + ln;
3551 /* The target is utf8, the pattern is not utf8. */
3556 if (NATIVE_TO_UNI(*(U8*)s) !=
3557 utf8n_to_uvuni((U8*)l, UTF8_MAXBYTES, &ulen,
3565 /* The target is not utf8, the pattern is utf8. */
3570 if (NATIVE_TO_UNI(*((U8*)l)) !=
3571 utf8n_to_uvuni((U8*)s, UTF8_MAXBYTES, &ulen,
3579 nextchr = UCHARAT(locinput);
3582 /* The target and the pattern have the same utf8ness. */
3583 /* Inline the first character, for speed. */
3584 if (UCHARAT(s) != nextchr)
3586 if (PL_regeol - locinput < ln)
3588 if (ln > 1 && memNE(s, locinput, ln))
3591 nextchr = UCHARAT(locinput);
3596 const U8 * fold_array;
3598 U32 fold_utf8_flags;
3600 PL_reg_flags |= RF_tainted;
3601 folder = foldEQ_locale;
3602 fold_array = PL_fold_locale;
3603 fold_utf8_flags = FOLDEQ_UTF8_LOCALE;
3607 folder = foldEQ_latin1;
3608 fold_array = PL_fold_latin1;
3609 fold_utf8_flags = 0;
3613 folder = foldEQ_latin1;
3614 fold_array = PL_fold_latin1;
3615 fold_utf8_flags = FOLDEQ_UTF8_NOMIX_ASCII;
3620 fold_array = PL_fold;
3621 fold_utf8_flags = 0;
3627 if (utf8_target || UTF_PATTERN) {
3628 /* Either target or the pattern are utf8. */
3629 const char * const l = locinput;
3630 char *e = PL_regeol;
3632 if (! foldEQ_utf8_flags(s, 0, ln, cBOOL(UTF_PATTERN),
3633 l, &e, 0, utf8_target, fold_utf8_flags))
3638 nextchr = UCHARAT(locinput);
3642 /* Neither the target nor the pattern are utf8 */
3643 if (UCHARAT(s) != nextchr &&
3644 UCHARAT(s) != fold_array[nextchr])
3648 if (PL_regeol - locinput < ln)
3650 if (ln > 1 && ! folder(s, locinput, ln))
3653 nextchr = UCHARAT(locinput);
3657 /* XXX Could improve efficiency by separating these all out using a
3658 * macro or in-line function. At that point regcomp.c would no longer
3659 * have to set the FLAGS fields of these */
3662 PL_reg_flags |= RF_tainted;
3670 /* was last char in word? */
3672 && FLAGS(scan) != REGEX_ASCII_RESTRICTED_CHARSET
3673 && FLAGS(scan) != REGEX_ASCII_MORE_RESTRICTED_CHARSET)
3675 if (locinput == PL_bostr)
3678 const U8 * const r = reghop3((U8*)locinput, -1, (U8*)PL_bostr);
3680 ln = utf8n_to_uvchr(r, UTF8SKIP(r), 0, uniflags);
3682 if (FLAGS(scan) != REGEX_LOCALE_CHARSET) {
3683 ln = isALNUM_uni(ln);
3684 LOAD_UTF8_CHARCLASS_ALNUM();
3685 n = swash_fetch(PL_utf8_alnum, (U8*)locinput, utf8_target);
3688 ln = isALNUM_LC_uvchr(UNI_TO_NATIVE(ln));
3689 n = isALNUM_LC_utf8((U8*)locinput);
3694 /* Here the string isn't utf8, or is utf8 and only ascii
3695 * characters are to match \w. In the latter case looking at
3696 * the byte just prior to the current one may be just the final
3697 * byte of a multi-byte character. This is ok. There are two
3699 * 1) it is a single byte character, and then the test is doing
3700 * just what it's supposed to.
3701 * 2) it is a multi-byte character, in which case the final
3702 * byte is never mistakable for ASCII, and so the test
3703 * will say it is not a word character, which is the
3704 * correct answer. */
3705 ln = (locinput != PL_bostr) ?
3706 UCHARAT(locinput - 1) : '\n';
3707 switch (FLAGS(scan)) {
3708 case REGEX_UNICODE_CHARSET:
3709 ln = isWORDCHAR_L1(ln);
3710 n = isWORDCHAR_L1(nextchr);
3712 case REGEX_LOCALE_CHARSET:
3713 ln = isALNUM_LC(ln);
3714 n = isALNUM_LC(nextchr);
3716 case REGEX_DEPENDS_CHARSET:
3718 n = isALNUM(nextchr);
3720 case REGEX_ASCII_RESTRICTED_CHARSET:
3721 case REGEX_ASCII_MORE_RESTRICTED_CHARSET:
3722 ln = isWORDCHAR_A(ln);
3723 n = isWORDCHAR_A(nextchr);
3726 Perl_croak(aTHX_ "panic: Unexpected FLAGS %u in op %u", FLAGS(scan), OP(scan));
3730 /* Note requires that all BOUNDs be lower than all NBOUNDs in
3732 if (((!ln) == (!n)) == (OP(scan) < NBOUND))
3737 if (utf8_target || state_num == ANYOFV) {
3738 STRLEN inclasslen = PL_regeol - locinput;
3739 if (locinput >= PL_regeol)
3742 if (!reginclass(rex, scan, (U8*)locinput, &inclasslen, utf8_target))
3744 locinput += inclasslen;
3745 nextchr = UCHARAT(locinput);
3750 nextchr = UCHARAT(locinput);
3751 if (!nextchr && locinput >= PL_regeol)
3753 if (!REGINCLASS(rex, scan, (U8*)locinput))
3755 nextchr = UCHARAT(++locinput);
3759 /* Special char classes - The defines start on line 129 or so */
3760 CCC_TRY_U(ALNUM, NALNUM, isWORDCHAR,
3761 ALNUML, NALNUML, isALNUM_LC, isALNUM_LC_utf8,
3762 ALNUMU, NALNUMU, isWORDCHAR_L1,
3763 ALNUMA, NALNUMA, isWORDCHAR_A,
3766 CCC_TRY_U(SPACE, NSPACE, isSPACE,
3767 SPACEL, NSPACEL, isSPACE_LC, isSPACE_LC_utf8,
3768 SPACEU, NSPACEU, isSPACE_L1,
3769 SPACEA, NSPACEA, isSPACE_A,
3772 CCC_TRY(DIGIT, NDIGIT, isDIGIT,
3773 DIGITL, NDIGITL, isDIGIT_LC, isDIGIT_LC_utf8,
3774 DIGITA, NDIGITA, isDIGIT_A,
3777 case CLUMP: /* Match \X: logical Unicode character. This is defined as
3778 a Unicode extended Grapheme Cluster */
3779 /* From http://www.unicode.org/reports/tr29 (5.2 version). An
3780 extended Grapheme Cluster is:
3783 | Prepend* Begin Extend*
3786 Begin is (Hangul-syllable | ! Control)
3787 Extend is (Grapheme_Extend | Spacing_Mark)
3788 Control is [ GCB_Control CR LF ]
3790 The discussion below shows how the code for CLUMP is derived
3791 from this regex. Note that most of these concepts are from
3792 property values of the Grapheme Cluster Boundary (GCB) property.
3793 No code point can have multiple property values for a given
3794 property. Thus a code point in Prepend can't be in Control, but
3795 it must be in !Control. This is why Control above includes
3796 GCB_Control plus CR plus LF. The latter two are used in the GCB
3797 property separately, and so can't be in GCB_Control, even though
3798 they logically are controls. Control is not the same as gc=cc,
3799 but includes format and other characters as well.
3801 The Unicode definition of Hangul-syllable is:
3803 | (L* ( ( V | LV ) V* | LVT ) T*)
3806 Each of these is a value for the GCB property, and hence must be
3807 disjoint, so the order they are tested is immaterial, so the
3808 above can safely be changed to
3811 | (L* ( LVT | ( V | LV ) V*) T*)
3813 The last two terms can be combined like this:
3815 | (( LVT | ( V | LV ) V*) T*))
3817 And refactored into this:
3818 L* (L | LVT T* | V V* T* | LV V* T*)
3820 That means that if we have seen any L's at all we can quit
3821 there, but if the next character is a LVT, a V or and LV we
3824 There is a subtlety with Prepend* which showed up in testing.
3825 Note that the Begin, and only the Begin is required in:
3826 | Prepend* Begin Extend*
3827 Also, Begin contains '! Control'. A Prepend must be a '!
3828 Control', which means it must be a Begin. What it comes down to
3829 is that if we match Prepend* and then find no suitable Begin
3830 afterwards, that if we backtrack the last Prepend, that one will
3831 be a suitable Begin.
3834 if (locinput >= PL_regeol)
3836 if (! utf8_target) {
3838 /* Match either CR LF or '.', as all the other possibilities
3840 locinput++; /* Match the . or CR */
3842 && locinput < PL_regeol
3843 && UCHARAT(locinput) == '\n') locinput++;
3847 /* Utf8: See if is ( CR LF ); already know that locinput <
3848 * PL_regeol, so locinput+1 is in bounds */
3849 if (nextchr == '\r' && UCHARAT(locinput + 1) == '\n') {
3853 /* In case have to backtrack to beginning, then match '.' */
3854 char *starting = locinput;
3856 /* In case have to backtrack the last prepend */
3857 char *previous_prepend = 0;
3859 LOAD_UTF8_CHARCLASS_GCB();
3861 /* Match (prepend)* */
3862 while (locinput < PL_regeol
3863 && swash_fetch(PL_utf8_X_prepend,
3864 (U8*)locinput, utf8_target))
3866 previous_prepend = locinput;
3867 locinput += UTF8SKIP(locinput);
3870 /* As noted above, if we matched a prepend character, but
3871 * the next thing won't match, back off the last prepend we
3872 * matched, as it is guaranteed to match the begin */
3873 if (previous_prepend
3874 && (locinput >= PL_regeol
3875 || ! swash_fetch(PL_utf8_X_begin,
3876 (U8*)locinput, utf8_target)))
3878 locinput = previous_prepend;
3881 /* Note that here we know PL_regeol > locinput, as we
3882 * tested that upon input to this switch case, and if we
3883 * moved locinput forward, we tested the result just above
3884 * and it either passed, or we backed off so that it will
3886 if (! swash_fetch(PL_utf8_X_begin, (U8*)locinput, utf8_target)) {
3888 /* Here did not match the required 'Begin' in the
3889 * second term. So just match the very first
3890 * character, the '.' of the final term of the regex */
3891 locinput = starting + UTF8SKIP(starting);
3894 /* Here is the beginning of a character that can have
3895 * an extender. It is either a hangul syllable, or a
3897 if (swash_fetch(PL_utf8_X_non_hangul,
3898 (U8*)locinput, utf8_target))
3901 /* Here not a Hangul syllable, must be a
3902 * ('! * Control') */
3903 locinput += UTF8SKIP(locinput);
3906 /* Here is a Hangul syllable. It can be composed
3907 * of several individual characters. One
3908 * possibility is T+ */
3909 if (swash_fetch(PL_utf8_X_T,
3910 (U8*)locinput, utf8_target))
3912 while (locinput < PL_regeol
3913 && swash_fetch(PL_utf8_X_T,
3914 (U8*)locinput, utf8_target))
3916 locinput += UTF8SKIP(locinput);
3920 /* Here, not T+, but is a Hangul. That means
3921 * it is one of the others: L, LV, LVT or V,
3923 * L* (L | LVT T* | V V* T* | LV V* T*) */
3926 while (locinput < PL_regeol
3927 && swash_fetch(PL_utf8_X_L,
3928 (U8*)locinput, utf8_target))
3930 locinput += UTF8SKIP(locinput);
3933 /* Here, have exhausted L*. If the next
3934 * character is not an LV, LVT nor V, it means
3935 * we had to have at least one L, so matches L+
3936 * in the original equation, we have a complete
3937 * hangul syllable. Are done. */
3939 if (locinput < PL_regeol
3940 && swash_fetch(PL_utf8_X_LV_LVT_V,
3941 (U8*)locinput, utf8_target))
3944 /* Otherwise keep going. Must be LV, LVT
3945 * or V. See if LVT */
3946 if (swash_fetch(PL_utf8_X_LVT,
3947 (U8*)locinput, utf8_target))
3949 locinput += UTF8SKIP(locinput);
3952 /* Must be V or LV. Take it, then
3954 locinput += UTF8SKIP(locinput);
3955 while (locinput < PL_regeol
3956 && swash_fetch(PL_utf8_X_V,
3957 (U8*)locinput, utf8_target))
3959 locinput += UTF8SKIP(locinput);
3963 /* And any of LV, LVT, or V can be followed
3965 while (locinput < PL_regeol
3966 && swash_fetch(PL_utf8_X_T,
3970 locinput += UTF8SKIP(locinput);
3976 /* Match any extender */
3977 while (locinput < PL_regeol
3978 && swash_fetch(PL_utf8_X_extend,
3979 (U8*)locinput, utf8_target))
3981 locinput += UTF8SKIP(locinput);
3985 if (locinput > PL_regeol) sayNO;
3987 nextchr = UCHARAT(locinput);
3991 { /* The capture buffer cases. The ones beginning with N for the
3992 named buffers just convert to the equivalent numbered and
3993 pretend they were called as the corresponding numbered buffer
3995 /* don't initialize these in the declaration, it makes C++
4000 const U8 *fold_array;
4003 PL_reg_flags |= RF_tainted;
4004 folder = foldEQ_locale;
4005 fold_array = PL_fold_locale;
4007 utf8_fold_flags = FOLDEQ_UTF8_LOCALE;
4011 folder = foldEQ_latin1;
4012 fold_array = PL_fold_latin1;
4014 utf8_fold_flags = FOLDEQ_UTF8_NOMIX_ASCII;
4018 folder = foldEQ_latin1;
4019 fold_array = PL_fold_latin1;
4021 utf8_fold_flags = 0;
4026 fold_array = PL_fold;
4028 utf8_fold_flags = 0;
4035 utf8_fold_flags = 0;
4038 /* For the named back references, find the corresponding buffer
4040 n = reg_check_named_buff_matched(rex,scan);
4045 goto do_nref_ref_common;
4048 PL_reg_flags |= RF_tainted;
4049 folder = foldEQ_locale;
4050 fold_array = PL_fold_locale;
4051 utf8_fold_flags = FOLDEQ_UTF8_LOCALE;
4055 folder = foldEQ_latin1;
4056 fold_array = PL_fold_latin1;
4057 utf8_fold_flags = FOLDEQ_UTF8_NOMIX_ASCII;
4061 folder = foldEQ_latin1;
4062 fold_array = PL_fold_latin1;
4063 utf8_fold_flags = 0;
4068 fold_array = PL_fold;
4069 utf8_fold_flags = 0;
4075 utf8_fold_flags = 0;
4079 n = ARG(scan); /* which paren pair */
4082 ln = PL_regoffs[n].start;
4083 PL_reg_leftiter = PL_reg_maxiter; /* Void cache */
4084 if (*PL_reglastparen < n || ln == -1)
4085 sayNO; /* Do not match unless seen CLOSEn. */
4086 if (ln == PL_regoffs[n].end)
4090 if (type != REF /* REF can do byte comparison */
4091 && (utf8_target || type == REFFU))
4092 { /* XXX handle REFFL better */
4093 char * limit = PL_regeol;
4095 /* This call case insensitively compares the entire buffer
4096 * at s, with the current input starting at locinput, but
4097 * not going off the end given by PL_regeol, and returns in
4098 * limit upon success, how much of the current input was
4100 if (! foldEQ_utf8_flags(s, NULL, PL_regoffs[n].end - ln, utf8_target,
4101 locinput, &limit, 0, utf8_target, utf8_fold_flags))
4106 nextchr = UCHARAT(locinput);
4110 /* Not utf8: Inline the first character, for speed. */
4111 if (UCHARAT(s) != nextchr &&
4113 UCHARAT(s) != fold_array[nextchr]))
4115 ln = PL_regoffs[n].end - ln;
4116 if (locinput + ln > PL_regeol)
4118 if (ln > 1 && (type == REF
4119 ? memNE(s, locinput, ln)
4120 : ! folder(s, locinput, ln)))
4123 nextchr = UCHARAT(locinput);
4133 #define ST st->u.eval
4138 regexp_internal *rei;
4139 regnode *startpoint;
4142 case GOSUB: /* /(...(?1))/ /(...(?&foo))/ */
4143 if (cur_eval && cur_eval->locinput==locinput) {
4144 if (cur_eval->u.eval.close_paren == (U32)ARG(scan))
4145 Perl_croak(aTHX_ "Infinite recursion in regex");
4146 if ( ++nochange_depth > max_nochange_depth )
4148 "Pattern subroutine nesting without pos change"
4149 " exceeded limit in regex");
4156 (void)ReREFCNT_inc(rex_sv);
4157 if (OP(scan)==GOSUB) {
4158 startpoint = scan + ARG2L(scan);
4159 ST.close_paren = ARG(scan);
4161 startpoint = rei->program+1;
4164 goto eval_recurse_doit;
4166 case EVAL: /* /(?{A})B/ /(??{A})B/ and /(?(?{A})X|Y)B/ */
4167 if (cur_eval && cur_eval->locinput==locinput) {
4168 if ( ++nochange_depth > max_nochange_depth )
4169 Perl_croak(aTHX_ "EVAL without pos change exceeded limit in regex");
4174 /* execute the code in the {...} */
4176 SV ** const before = SP;
4177 OP_4tree * const oop = PL_op;
4178 COP * const ocurcop = PL_curcop;
4180 char *saved_regeol = PL_regeol;
4181 struct re_save_state saved_state;
4183 /* To not corrupt the existing regex state while executing the
4184 * eval we would normally put it on the save stack, like with
4185 * save_re_context. However, re-evals have a weird scoping so we
4186 * can't just add ENTER/LEAVE here. With that, things like
4188 * (?{$a=2})(a(?{local$a=$a+1}))*aak*c(?{$b=$a})
4190 * would break, as they expect the localisation to be unwound
4191 * only when the re-engine backtracks through the bit that
4194 * What we do instead is just saving the state in a local c
4197 Copy(&PL_reg_state, &saved_state, 1, struct re_save_state);
4200 PL_op = (OP_4tree*)rexi->data->data[n];
4201 DEBUG_STATE_r( PerlIO_printf(Perl_debug_log,
4202 " re_eval 0x%"UVxf"\n", PTR2UV(PL_op)) );
4203 PAD_SAVE_LOCAL(old_comppad, (PAD*)rexi->data->data[n + 2]);
4204 PL_regoffs[0].end = PL_reg_magic->mg_len = locinput - PL_bostr;
4207 SV *sv_mrk = get_sv("REGMARK", 1);
4208 sv_setsv(sv_mrk, sv_yes_mark);
4211 CALLRUNOPS(aTHX); /* Scalar context. */
4214 ret = &PL_sv_undef; /* protect against empty (?{}) blocks. */
4220 Copy(&saved_state, &PL_reg_state, 1, struct re_save_state);
4223 PAD_RESTORE_LOCAL(old_comppad);
4224 PL_curcop = ocurcop;
4225 PL_regeol = saved_regeol;
4228 sv_setsv(save_scalar(PL_replgv), ret);
4232 if (logical == 2) { /* Postponed subexpression: /(??{...})/ */
4235 /* extract RE object from returned value; compiling if
4241 SV *const sv = SvRV(ret);
4243 if (SvTYPE(sv) == SVt_REGEXP) {
4245 } else if (SvSMAGICAL(sv)) {
4246 mg = mg_find(sv, PERL_MAGIC_qr);
4249 } else if (SvTYPE(ret) == SVt_REGEXP) {
4251 } else if (SvSMAGICAL(ret)) {
4252 if (SvGMAGICAL(ret)) {
4253 /* I don't believe that there is ever qr magic
4255 assert(!mg_find(ret, PERL_MAGIC_qr));
4256 sv_unmagic(ret, PERL_MAGIC_qr);
4259 mg = mg_find(ret, PERL_MAGIC_qr);
4260 /* testing suggests mg only ends up non-NULL for
4261 scalars who were upgraded and compiled in the
4262 else block below. In turn, this is only
4263 triggered in the "postponed utf8 string" tests
4269 rx = (REGEXP *) mg->mg_obj; /*XXX:dmq*/
4273 rx = reg_temp_copy(NULL, rx);
4277 const I32 osize = PL_regsize;
4280 assert (SvUTF8(ret));
4281 } else if (SvUTF8(ret)) {
4282 /* Not doing UTF-8, despite what the SV says. Is
4283 this only if we're trapped in use 'bytes'? */
4284 /* Make a copy of the octet sequence, but without
4285 the flag on, as the compiler now honours the
4286 SvUTF8 flag on ret. */
4288 const char *const p = SvPV(ret, len);
4289 ret = newSVpvn_flags(p, len, SVs_TEMP);
4291 rx = CALLREGCOMP(ret, pm_flags);
4293 & (SVs_TEMP | SVs_PADTMP | SVf_READONLY
4295 /* This isn't a first class regexp. Instead, it's
4296 caching a regexp onto an existing, Perl visible
4298 sv_magic(ret, MUTABLE_SV(rx), PERL_MAGIC_qr, 0, 0);
4303 re = (struct regexp *)SvANY(rx);
4305 RXp_MATCH_COPIED_off(re);
4306 re->subbeg = rex->subbeg;
4307 re->sublen = rex->sublen;
4310 debug_start_match(re_sv, utf8_target, locinput, PL_regeol,
4311 "Matching embedded");
4313 startpoint = rei->program + 1;
4314 ST.close_paren = 0; /* only used for GOSUB */
4315 /* borrowed from regtry */
4316 if (PL_reg_start_tmpl <= re->nparens) {
4317 PL_reg_start_tmpl = re->nparens*3/2 + 3;
4318 if(PL_reg_start_tmp)
4319 Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*);
4321 Newx(PL_reg_start_tmp, PL_reg_start_tmpl, char*);
4324 eval_recurse_doit: /* Share code with GOSUB below this line */
4325 /* run the pattern returned from (??{...}) */
4326 ST.cp = regcppush(0); /* Save *all* the positions. */
4327 REGCP_SET(ST.lastcp);
4329 PL_regoffs = re->offs; /* essentially NOOP on GOSUB */
4331 /* see regtry, specifically PL_reglast(?:close)?paren is a pointer! (i dont know why) :dmq */
4332 PL_reglastparen = &re->lastparen;
4333 PL_reglastcloseparen = &re->lastcloseparen;
4335 re->lastcloseparen = 0;
4337 PL_reginput = locinput;
4340 /* XXXX This is too dramatic a measure... */
4343 ST.toggle_reg_flags = PL_reg_flags;
4345 PL_reg_flags |= RF_utf8;
4347 PL_reg_flags &= ~RF_utf8;
4348 ST.toggle_reg_flags ^= PL_reg_flags; /* diff of old and new */
4350 ST.prev_rex = rex_sv;
4351 ST.prev_curlyx = cur_curlyx;
4352 SETREX(rex_sv,re_sv);
4357 ST.prev_eval = cur_eval;
4359 /* now continue from first node in postoned RE */
4360 PUSH_YES_STATE_GOTO(EVAL_AB, startpoint);
4363 /* logical is 1, /(?(?{...})X|Y)/ */
4364 sw = cBOOL(SvTRUE(ret));
4369 case EVAL_AB: /* cleanup after a successful (??{A})B */
4370 /* note: this is called twice; first after popping B, then A */
4371 PL_reg_flags ^= ST.toggle_reg_flags;
4372 ReREFCNT_dec(rex_sv);
4373 SETREX(rex_sv,ST.prev_rex);
4374 rex = (struct regexp *)SvANY(rex_sv);
4375 rexi = RXi_GET(rex);
4377 cur_eval = ST.prev_eval;
4378 cur_curlyx = ST.prev_curlyx;
4380 /* rex was changed so update the pointer in PL_reglastparen and PL_reglastcloseparen */
4381 PL_reglastparen = &rex->lastparen;
4382 PL_reglastcloseparen = &rex->lastcloseparen;
4383 /* also update PL_regoffs */
4384 PL_regoffs = rex->offs;
4386 /* XXXX This is too dramatic a measure... */
4388 if ( nochange_depth )
4393 case EVAL_AB_fail: /* unsuccessfully ran A or B in (??{A})B */
4394 /* note: this is called twice; first after popping B, then A */
4395 PL_reg_flags ^= ST.toggle_reg_flags;
4396 ReREFCNT_dec(rex_sv);
4397 SETREX(rex_sv,ST.prev_rex);
4398 rex = (struct regexp *)SvANY(rex_sv);
4399 rexi = RXi_GET(rex);
4400 /* rex was changed so update the pointer in PL_reglastparen and PL_reglastcloseparen */
4401 PL_reglastparen = &rex->lastparen;
4402 PL_reglastcloseparen = &rex->lastcloseparen;
4404 PL_reginput = locinput;
4405 REGCP_UNWIND(ST.lastcp);
4407 cur_eval = ST.prev_eval;
4408 cur_curlyx = ST.prev_curlyx;
4409 /* XXXX This is too dramatic a measure... */
4411 if ( nochange_depth )
4417 n = ARG(scan); /* which paren pair */
4418 PL_reg_start_tmp[n] = locinput;
4424 n = ARG(scan); /* which paren pair */
4425 PL_regoffs[n].start = PL_reg_start_tmp[n] - PL_bostr;
4426 PL_regoffs[n].end = locinput - PL_bostr;
4427 /*if (n > PL_regsize)
4429 if (n > *PL_reglastparen)
4430 *PL_reglastparen = n;
4431 *PL_reglastcloseparen = n;
4432 if (cur_eval && cur_eval->u.eval.close_paren == n) {
4440 cursor && OP(cursor)!=END;
4441 cursor=regnext(cursor))
4443 if ( OP(cursor)==CLOSE ){
4445 if ( n <= lastopen ) {
4447 = PL_reg_start_tmp[n] - PL_bostr;
4448 PL_regoffs[n].end = locinput - PL_bostr;
4449 /*if (n > PL_regsize)
4451 if (n > *PL_reglastparen)
4452 *PL_reglastparen = n;
4453 *PL_reglastcloseparen = n;
4454 if ( n == ARG(scan) || (cur_eval &&
4455 cur_eval->u.eval.close_paren == n))
4464 n = ARG(scan); /* which paren pair */
4465 sw = cBOOL(*PL_reglastparen >= n && PL_regoffs[n].end != -1);
4468 /* reg_check_named_buff_matched returns 0 for no match */
4469 sw = cBOOL(0 < reg_check_named_buff_matched(rex,scan));
4473 sw = (cur_eval && (!n || cur_eval->u.eval.close_paren == n));
4479 PL_reg_leftiter = PL_reg_maxiter; /* Void cache */
4481 next = NEXTOPER(NEXTOPER(scan));
4483 next = scan + ARG(scan);
4484 if (OP(next) == IFTHEN) /* Fake one. */
4485 next = NEXTOPER(NEXTOPER(next));
4489 logical = scan->flags;
4492 /*******************************************************************
4494 The CURLYX/WHILEM pair of ops handle the most generic case of the /A*B/
4495 pattern, where A and B are subpatterns. (For simple A, CURLYM or
4496 STAR/PLUS/CURLY/CURLYN are used instead.)
4498 A*B is compiled as <CURLYX><A><WHILEM><B>
4500 On entry to the subpattern, CURLYX is called. This pushes a CURLYX
4501 state, which contains the current count, initialised to -1. It also sets
4502 cur_curlyx to point to this state, with any previous value saved in the
4505 CURLYX then jumps straight to the WHILEM op, rather than executing A,
4506 since the pattern may possibly match zero times (i.e. it's a while {} loop
4507 rather than a do {} while loop).
4509 Each entry to WHILEM represents a successful match of A. The count in the
4510 CURLYX block is incremented, another WHILEM state is pushed, and execution
4511 passes to A or B depending on greediness and the current count.
4513 For example, if matching against the string a1a2a3b (where the aN are
4514 substrings that match /A/), then the match progresses as follows: (the
4515 pushed states are interspersed with the bits of strings matched so far):
4518 <CURLYX cnt=0><WHILEM>
4519 <CURLYX cnt=1><WHILEM> a1 <WHILEM>
4520 <CURLYX cnt=2><WHILEM> a1 <WHILEM> a2 <WHILEM>
4521 <CURLYX cnt=3><WHILEM> a1 <WHILEM> a2 <WHILEM> a3 <WHILEM>
4522 <CURLYX cnt=3><WHILEM> a1 <WHILEM> a2 <WHILEM> a3 <WHILEM> b
4524 (Contrast this with something like CURLYM, which maintains only a single
4528 a1 <CURLYM cnt=1> a2
4529 a1 a2 <CURLYM cnt=2> a3
4530 a1 a2 a3 <CURLYM cnt=3> b
4533 Each WHILEM state block marks a point to backtrack to upon partial failure
4534 of A or B, and also contains some minor state data related to that
4535 iteration. The CURLYX block, pointed to by cur_curlyx, contains the
4536 overall state, such as the count, and pointers to the A and B ops.
4538 This is complicated slightly by nested CURLYX/WHILEM's. Since cur_curlyx
4539 must always point to the *current* CURLYX block, the rules are:
4541 When executing CURLYX, save the old cur_curlyx in the CURLYX state block,
4542 and set cur_curlyx to point the new block.
4544 When popping the CURLYX block after a successful or unsuccessful match,
4545 restore the previous cur_curlyx.
4547 When WHILEM is about to execute B, save the current cur_curlyx, and set it
4548 to the outer one saved in the CURLYX block.
4550 When popping the WHILEM block after a successful or unsuccessful B match,
4551 restore the previous cur_curlyx.
4553 Here's an example for the pattern (AI* BI)*BO
4554 I and O refer to inner and outer, C and W refer to CURLYX and WHILEM:
4557 curlyx backtrack stack
4558 ------ ---------------
4560 CO <CO prev=NULL> <WO>
4561 CI <CO prev=NULL> <WO> <CI prev=CO> <WI> ai
4562 CO <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi
4563 NULL <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi <WO prev=CO> bo
4565 At this point the pattern succeeds, and we work back down the stack to
4566 clean up, restoring as we go:
4568 CO <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi
4569 CI <CO prev=NULL> <WO> <CI prev=CO> <WI> ai
4570 CO <CO prev=NULL> <WO>
4573 *******************************************************************/
4575 #define ST st->u.curlyx
4577 case CURLYX: /* start of /A*B/ (for complex A) */
4579 /* No need to save/restore up to this paren */
4580 I32 parenfloor = scan->flags;
4582 assert(next); /* keep Coverity happy */
4583 if (OP(PREVOPER(next)) == NOTHING) /* LONGJMP */
4586 /* XXXX Probably it is better to teach regpush to support
4587 parenfloor > PL_regsize... */
4588 if (parenfloor > (I32)*PL_reglastparen)
4589 parenfloor = *PL_reglastparen; /* Pessimization... */
4591 ST.prev_curlyx= cur_curlyx;
4593 ST.cp = PL_savestack_ix;
4595 /* these fields contain the state of the current curly.
4596 * they are accessed by subsequent WHILEMs */
4597 ST.parenfloor = parenfloor;
4602 ST.count = -1; /* this will be updated by WHILEM */
4603 ST.lastloc = NULL; /* this will be updated by WHILEM */
4605 PL_reginput = locinput;
4606 PUSH_YES_STATE_GOTO(CURLYX_end, PREVOPER(next));
4610 case CURLYX_end: /* just finished matching all of A*B */
4611 cur_curlyx = ST.prev_curlyx;
4615 case CURLYX_end_fail: /* just failed to match all of A*B */
4617 cur_curlyx = ST.prev_curlyx;
4623 #define ST st->u.whilem
4625 case WHILEM: /* just matched an A in /A*B/ (for complex A) */
4627 /* see the discussion above about CURLYX/WHILEM */
4629 int min = ARG1(cur_curlyx->u.curlyx.me);
4630 int max = ARG2(cur_curlyx->u.curlyx.me);
4631 regnode *A = NEXTOPER(cur_curlyx->u.curlyx.me) + EXTRA_STEP_2ARGS;
4633 assert(cur_curlyx); /* keep Coverity happy */
4634 n = ++cur_curlyx->u.curlyx.count; /* how many A's matched */
4635 ST.save_lastloc = cur_curlyx->u.curlyx.lastloc;
4636 ST.cache_offset = 0;
4639 PL_reginput = locinput;
4641 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
4642 "%*s whilem: matched %ld out of %d..%d\n",
4643 REPORT_CODE_OFF+depth*2, "", (long)n, min, max)
4646 /* First just match a string of min A's. */
4649 ST.cp = regcppush(cur_curlyx->u.curlyx.parenfloor);
4650 cur_curlyx->u.curlyx.lastloc = locinput;
4651 REGCP_SET(ST.lastcp);
4653 PUSH_STATE_GOTO(WHILEM_A_pre, A);
4657 /* If degenerate A matches "", assume A done. */
4659 if (locinput == cur_curlyx->u.curlyx.lastloc) {
4660 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
4661 "%*s whilem: empty match detected, trying continuation...\n",
4662 REPORT_CODE_OFF+depth*2, "")
4664 goto do_whilem_B_max;
4667 /* super-linear cache processing */
4671 if (!PL_reg_maxiter) {
4672 /* start the countdown: Postpone detection until we
4673 * know the match is not *that* much linear. */
4674 PL_reg_maxiter = (PL_regeol - PL_bostr + 1) * (scan->flags>>4);
4675 /* possible overflow for long strings and many CURLYX's */
4676 if (PL_reg_maxiter < 0)
4677 PL_reg_maxiter = I32_MAX;
4678 PL_reg_leftiter = PL_reg_maxiter;
4681 if (PL_reg_leftiter-- == 0) {
4682 /* initialise cache */
4683 const I32 size = (PL_reg_maxiter + 7)/8;
4684 if (PL_reg_poscache) {
4685 if ((I32)PL_reg_poscache_size < size) {
4686 Renew(PL_reg_poscache, size, char);
4687 PL_reg_poscache_size = size;
4689 Zero(PL_reg_poscache, size, char);
4692 PL_reg_poscache_size = size;
4693 Newxz(PL_reg_poscache, size, char);
4695 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
4696 "%swhilem: Detected a super-linear match, switching on caching%s...\n",
4697 PL_colors[4], PL_colors[5])
4701 if (PL_reg_leftiter < 0) {
4702 /* have we already failed at this position? */
4704 offset = (scan->flags & 0xf) - 1
4705 + (locinput - PL_bostr) * (scan->flags>>4);
4706 mask = 1 << (offset % 8);
4708 if (PL_reg_poscache[offset] & mask) {
4709 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
4710 "%*s whilem: (cache) already tried at this position...\n",
4711 REPORT_CODE_OFF+depth*2, "")
4713 sayNO; /* cache records failure */
4715 ST.cache_offset = offset;
4716 ST.cache_mask = mask;
4720 /* Prefer B over A for minimal matching. */
4722 if (cur_curlyx->u.curlyx.minmod) {
4723 ST.save_curlyx = cur_curlyx;
4724 cur_curlyx = cur_curlyx->u.curlyx.prev_curlyx;
4725 ST.cp = regcppush(ST.save_curlyx->u.curlyx.parenfloor);
4726 REGCP_SET(ST.lastcp);
4727 PUSH_YES_STATE_GOTO(WHILEM_B_min, ST.save_curlyx->u.curlyx.B);
4731 /* Prefer A over B for maximal matching. */
4733 if (n < max) { /* More greed allowed? */
4734 ST.cp = regcppush(cur_curlyx->u.curlyx.parenfloor);
4735 cur_curlyx->u.curlyx.lastloc = locinput;
4736 REGCP_SET(ST.lastcp);
4737 PUSH_STATE_GOTO(WHILEM_A_max, A);
4740 goto do_whilem_B_max;
4744 case WHILEM_B_min: /* just matched B in a minimal match */
4745 case WHILEM_B_max: /* just matched B in a maximal match */
4746 cur_curlyx = ST.save_curlyx;
4750 case WHILEM_B_max_fail: /* just failed to match B in a maximal match */
4751 cur_curlyx = ST.save_curlyx;
4752 cur_curlyx->u.curlyx.lastloc = ST.save_lastloc;
4753 cur_curlyx->u.curlyx.count--;
4757 case WHILEM_A_min_fail: /* just failed to match A in a minimal match */
4759 case WHILEM_A_pre_fail: /* just failed to match even minimal A */
4760 REGCP_UNWIND(ST.lastcp);
4762 cur_curlyx->u.curlyx.lastloc = ST.save_lastloc;
4763 cur_curlyx->u.curlyx.count--;
4767 case WHILEM_A_max_fail: /* just failed to match A in a maximal match */
4768 REGCP_UNWIND(ST.lastcp);
4769 regcppop(rex); /* Restore some previous $<digit>s? */
4770 PL_reginput = locinput;
4771 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
4772 "%*s whilem: failed, trying continuation...\n",
4773 REPORT_CODE_OFF+depth*2, "")
4776 if (cur_curlyx->u.curlyx.count >= REG_INFTY
4777 && ckWARN(WARN_REGEXP)
4778 && !(PL_reg_flags & RF_warned))
4780 PL_reg_flags |= RF_warned;
4781 Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s limit (%d) exceeded",
4782 "Complex regular subexpression recursion",
4787 ST.save_curlyx = cur_curlyx;
4788 cur_curlyx = cur_curlyx->u.curlyx.prev_curlyx;
4789 PUSH_YES_STATE_GOTO(WHILEM_B_max, ST.save_curlyx->u.curlyx.B);
4792 case WHILEM_B_min_fail: /* just failed to match B in a minimal match */
4793 cur_curlyx = ST.save_curlyx;
4794 REGCP_UNWIND(ST.lastcp);
4797 if (cur_curlyx->u.curlyx.count >= /*max*/ARG2(cur_curlyx->u.curlyx.me)) {
4798 /* Maximum greed exceeded */
4799 if (cur_curlyx->u.curlyx.count >= REG_INFTY
4800 && ckWARN(WARN_REGEXP)
4801 && !(PL_reg_flags & RF_warned))
4803 PL_reg_flags |= RF_warned;
4804 Perl_warner(aTHX_ packWARN(WARN_REGEXP),
4805 "%s limit (%d) exceeded",
4806 "Complex regular subexpression recursion",
4809 cur_curlyx->u.curlyx.count--;
4813 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
4814 "%*s trying longer...\n", REPORT_CODE_OFF+depth*2, "")
4816 /* Try grabbing another A and see if it helps. */
4817 PL_reginput = locinput;
4818 cur_curlyx->u.curlyx.lastloc = locinput;
4819 ST.cp = regcppush(cur_curlyx->u.curlyx.parenfloor);
4820 REGCP_SET(ST.lastcp);
4821 PUSH_STATE_GOTO(WHILEM_A_min,
4822 /*A*/ NEXTOPER(ST.save_curlyx->u.curlyx.me) + EXTRA_STEP_2ARGS);
4826 #define ST st->u.branch
4828 case BRANCHJ: /* /(...|A|...)/ with long next pointer */
4829 next = scan + ARG(scan);
4832 scan = NEXTOPER(scan);
4835 case BRANCH: /* /(...|A|...)/ */
4836 scan = NEXTOPER(scan); /* scan now points to inner node */
4837 ST.lastparen = *PL_reglastparen;
4838 ST.next_branch = next;
4840 PL_reginput = locinput;
4842 /* Now go into the branch */
4844 PUSH_YES_STATE_GOTO(BRANCH_next, scan);
4846 PUSH_STATE_GOTO(BRANCH_next, scan);
4850 PL_reginput = locinput;
4851 sv_yes_mark = st->u.mark.mark_name = scan->flags ? NULL :
4852 MUTABLE_SV(rexi->data->data[ ARG( scan ) ]);
4853 PUSH_STATE_GOTO(CUTGROUP_next,next);
4855 case CUTGROUP_next_fail:
4858 if (st->u.mark.mark_name)
4859 sv_commit = st->u.mark.mark_name;
4865 case BRANCH_next_fail: /* that branch failed; try the next, if any */
4870 REGCP_UNWIND(ST.cp);
4871 for (n = *PL_reglastparen; n > ST.lastparen; n--)
4872 PL_regoffs[n].end = -1;
4873 *PL_reglastparen = n;
4874 /*dmq: *PL_reglastcloseparen = n; */
4875 scan = ST.next_branch;
4876 /* no more branches? */
4877 if (!scan || (OP(scan) != BRANCH && OP(scan) != BRANCHJ)) {
4879 PerlIO_printf( Perl_debug_log,
4880 "%*s %sBRANCH failed...%s\n",
4881 REPORT_CODE_OFF+depth*2, "",
4887 continue; /* execute next BRANCH[J] op */
4895 #define ST st->u.curlym
4897 case CURLYM: /* /A{m,n}B/ where A is fixed-length */
4899 /* This is an optimisation of CURLYX that enables us to push
4900 * only a single backtracking state, no matter how many matches
4901 * there are in {m,n}. It relies on the pattern being constant
4902 * length, with no parens to influence future backrefs
4906 scan = NEXTOPER(scan) + NODE_STEP_REGNODE;
4908 /* if paren positive, emulate an OPEN/CLOSE around A */
4910 U32 paren = ST.me->flags;
4911 if (paren > PL_regsize)
4913 if (paren > *PL_reglastparen)
4914 *PL_reglastparen = paren;
4915 scan += NEXT_OFF(scan); /* Skip former OPEN. */
4923 ST.c1 = CHRTEST_UNINIT;
4926 if (!(ST.minmod ? ARG1(ST.me) : ARG2(ST.me))) /* min/max */
4929 curlym_do_A: /* execute the A in /A{m,n}B/ */
4930 PL_reginput = locinput;
4931 PUSH_YES_STATE_GOTO(CURLYM_A, ST.A); /* match A */
4934 case CURLYM_A: /* we've just matched an A */
4935 locinput = st->locinput;
4936 nextchr = UCHARAT(locinput);
4939 /* after first match, determine A's length: u.curlym.alen */
4940 if (ST.count == 1) {
4941 if (PL_reg_match_utf8) {
4943 while (s < PL_reginput) {
4949 ST.alen = PL_reginput - locinput;
4952 ST.count = ST.minmod ? ARG1(ST.me) : ARG2(ST.me);
4955 PerlIO_printf(Perl_debug_log,
4956 "%*s CURLYM now matched %"IVdf" times, len=%"IVdf"...\n",
4957 (int)(REPORT_CODE_OFF+(depth*2)), "",
4958 (IV) ST.count, (IV)ST.alen)
4961 locinput = PL_reginput;
4963 if (cur_eval && cur_eval->u.eval.close_paren &&
4964 cur_eval->u.eval.close_paren == (U32)ST.me->flags)
4968 I32 max = (ST.minmod ? ARG1(ST.me) : ARG2(ST.me));
4969 if ( max == REG_INFTY || ST.count < max )
4970 goto curlym_do_A; /* try to match another A */
4972 goto curlym_do_B; /* try to match B */
4974 case CURLYM_A_fail: /* just failed to match an A */
4975 REGCP_UNWIND(ST.cp);
4977 if (ST.minmod || ST.count < ARG1(ST.me) /* min*/
4978 || (cur_eval && cur_eval->u.eval.close_paren &&
4979 cur_eval->u.eval.close_paren == (U32)ST.me->flags))
4982 curlym_do_B: /* execute the B in /A{m,n}B/ */
4983 PL_reginput = locinput;
4984 if (ST.c1 == CHRTEST_UNINIT) {
4985 /* calculate c1 and c2 for possible match of 1st char
4986 * following curly */
4987 ST.c1 = ST.c2 = CHRTEST_VOID;
4988 if (HAS_TEXT(ST.B) || JUMPABLE(ST.B)) {
4989 regnode *text_node = ST.B;
4990 if (! HAS_TEXT(text_node))
4991 FIND_NEXT_IMPT(text_node);
4994 (HAS_TEXT(text_node) && PL_regkind[OP(text_node)] == EXACT)
4996 But the former is redundant in light of the latter.
4998 if this changes back then the macro for
4999 IS_TEXT and friends need to change.
5001 if (PL_regkind[OP(text_node)] == EXACT)
5004 ST.c1 = (U8)*STRING(text_node);
5005 switch (OP(text_node)) {
5006 case EXACTF: ST.c2 = PL_fold[ST.c1]; break;
5008 case EXACTFU: ST.c2 = PL_fold_latin1[ST.c1]; break;
5009 case EXACTFL: ST.c2 = PL_fold_locale[ST.c1]; break;
5010 default: ST.c2 = ST.c1;
5017 PerlIO_printf(Perl_debug_log,
5018 "%*s CURLYM trying tail with matches=%"IVdf"...\n",
5019 (int)(REPORT_CODE_OFF+(depth*2)),
5022 if (ST.c1 != CHRTEST_VOID
5023 && UCHARAT(PL_reginput) != ST.c1
5024 && UCHARAT(PL_reginput) != ST.c2)
5026 /* simulate B failing */
5028 PerlIO_printf(Perl_debug_log,
5029 "%*s CURLYM Fast bail c1=%"IVdf" c2=%"IVdf"\n",
5030 (int)(REPORT_CODE_OFF+(depth*2)),"",
5033 state_num = CURLYM_B_fail;
5034 goto reenter_switch;
5038 /* mark current A as captured */
5039 I32 paren = ST.me->flags;
5041 PL_regoffs[paren].start
5042 = HOPc(PL_reginput, -ST.alen) - PL_bostr;
5043 PL_regoffs[paren].end = PL_reginput - PL_bostr;
5044 /*dmq: *PL_reglastcloseparen = paren; */
5047 PL_regoffs[paren].end = -1;
5048 if (cur_eval && cur_eval->u.eval.close_paren &&
5049 cur_eval->u.eval.close_paren == (U32)ST.me->flags)
5058 PUSH_STATE_GOTO(CURLYM_B, ST.B); /* match B */
5061 case CURLYM_B_fail: /* just failed to match a B */
5062 REGCP_UNWIND(ST.cp);
5064 I32 max = ARG2(ST.me);
5065 if (max != REG_INFTY && ST.count == max)
5067 goto curlym_do_A; /* try to match a further A */
5069 /* backtrack one A */
5070 if (ST.count == ARG1(ST.me) /* min */)
5073 locinput = HOPc(locinput, -ST.alen);
5074 goto curlym_do_B; /* try to match B */
5077 #define ST st->u.curly
5079 #define CURLY_SETPAREN(paren, success) \
5082 PL_regoffs[paren].start = HOPc(locinput, -1) - PL_bostr; \
5083 PL_regoffs[paren].end = locinput - PL_bostr; \
5084 *PL_reglastcloseparen = paren; \
5087 PL_regoffs[paren].end = -1; \
5090 case STAR: /* /A*B/ where A is width 1 */
5094 scan = NEXTOPER(scan);
5096 case PLUS: /* /A+B/ where A is width 1 */
5100 scan = NEXTOPER(scan);
5102 case CURLYN: /* /(A){m,n}B/ where A is width 1 */
5103 ST.paren = scan->flags; /* Which paren to set */
5104 if (ST.paren > PL_regsize)
5105 PL_regsize = ST.paren;
5106 if (ST.paren > *PL_reglastparen)
5107 *PL_reglastparen = ST.paren;
5108 ST.min = ARG1(scan); /* min to match */
5109 ST.max = ARG2(scan); /* max to match */
5110 if (cur_eval && cur_eval->u.eval.close_paren &&
5111 cur_eval->u.eval.close_paren == (U32)ST.paren) {
5115 scan = regnext(NEXTOPER(scan) + NODE_STEP_REGNODE);
5117 case CURLY: /* /A{m,n}B/ where A is width 1 */
5119 ST.min = ARG1(scan); /* min to match */
5120 ST.max = ARG2(scan); /* max to match */
5121 scan = NEXTOPER(scan) + NODE_STEP_REGNODE;
5124 * Lookahead to avoid useless match attempts
5125 * when we know what character comes next.
5127 * Used to only do .*x and .*?x, but now it allows
5128 * for )'s, ('s and (?{ ... })'s to be in the way
5129 * of the quantifier and the EXACT-like node. -- japhy
5132 if (ST.min > ST.max) /* XXX make this a compile-time check? */
5134 if (HAS_TEXT(next) || JUMPABLE(next)) {
5136 regnode *text_node = next;
5138 if (! HAS_TEXT(text_node))
5139 FIND_NEXT_IMPT(text_node);
5141 if (! HAS_TEXT(text_node))
5142 ST.c1 = ST.c2 = CHRTEST_VOID;
5144 if ( PL_regkind[OP(text_node)] != EXACT ) {
5145 ST.c1 = ST.c2 = CHRTEST_VOID;
5146 goto assume_ok_easy;
5149 s = (U8*)STRING(text_node);
5151 /* Currently we only get here when
5153 PL_rekind[OP(text_node)] == EXACT
5155 if this changes back then the macro for IS_TEXT and
5156 friends need to change. */
5159 switch (OP(text_node)) {
5160 case EXACTF: ST.c2 = PL_fold[ST.c1]; break;
5162 case EXACTFU: ST.c2 = PL_fold_latin1[ST.c1]; break;
5163 case EXACTFL: ST.c2 = PL_fold_locale[ST.c1]; break;
5164 default: ST.c2 = ST.c1; break;
5167 else { /* UTF_PATTERN */
5168 if (IS_TEXTFU(text_node) || IS_TEXTF(text_node)) {
5169 STRLEN ulen1, ulen2;
5170 U8 tmpbuf1[UTF8_MAXBYTES_CASE+1];
5171 U8 tmpbuf2[UTF8_MAXBYTES_CASE+1];
5173 to_utf8_lower((U8*)s, tmpbuf1, &ulen1);
5174 to_utf8_upper((U8*)s, tmpbuf2, &ulen2);
5176 ST.c1 = utf8n_to_uvchr(tmpbuf1, UTF8_MAXLEN, 0,
5178 0 : UTF8_ALLOW_ANY);
5179 ST.c2 = utf8n_to_uvchr(tmpbuf2, UTF8_MAXLEN, 0,
5181 0 : UTF8_ALLOW_ANY);
5183 ST.c1 = utf8n_to_uvuni(tmpbuf1, UTF8_MAXBYTES, 0,
5185 ST.c2 = utf8n_to_uvuni(tmpbuf2, UTF8_MAXBYTES, 0,
5190 ST.c2 = ST.c1 = utf8n_to_uvchr(s, UTF8_MAXBYTES, 0,
5197 ST.c1 = ST.c2 = CHRTEST_VOID;
5202 PL_reginput = locinput;
5205 if (ST.min && regrepeat(rex, ST.A, ST.min, depth) < ST.min)
5208 locinput = PL_reginput;
5210 if (ST.c1 == CHRTEST_VOID)
5211 goto curly_try_B_min;
5213 ST.oldloc = locinput;
5215 /* set ST.maxpos to the furthest point along the
5216 * string that could possibly match */
5217 if (ST.max == REG_INFTY) {
5218 ST.maxpos = PL_regeol - 1;
5220 while (UTF8_IS_CONTINUATION(*(U8*)ST.maxpos))
5223 else if (utf8_target) {
5224 int m = ST.max - ST.min;
5225 for (ST.maxpos = locinput;
5226 m >0 && ST.maxpos + UTF8SKIP(ST.maxpos) <= PL_regeol; m--)
5227 ST.maxpos += UTF8SKIP(ST.maxpos);
5230 ST.maxpos = locinput + ST.max - ST.min;
5231 if (ST.maxpos >= PL_regeol)
5232 ST.maxpos = PL_regeol - 1;
5234 goto curly_try_B_min_known;
5238 ST.count = regrepeat(rex, ST.A, ST.max, depth);
5239 locinput = PL_reginput;
5240 if (ST.count < ST.min)
5242 if ((ST.count > ST.min)
5243 && (PL_regkind[OP(ST.B)] == EOL) && (OP(ST.B) != MEOL))
5245 /* A{m,n} must come at the end of the string, there's
5246 * no point in backing off ... */
5248 /* ...except that $ and \Z can match before *and* after
5249 newline at the end. Consider "\n\n" =~ /\n+\Z\n/.
5250 We may back off by one in this case. */
5251 if (UCHARAT(PL_reginput - 1) == '\n' && OP(ST.B) != EOS)
5255 goto curly_try_B_max;
5260 case CURLY_B_min_known_fail:
5261 /* failed to find B in a non-greedy match where c1,c2 valid */
5262 if (ST.paren && ST.count)
5263 PL_regoffs[ST.paren].end = -1;
5265 PL_reginput = locinput; /* Could be reset... */
5266 REGCP_UNWIND(ST.cp);
5267 /* Couldn't or didn't -- move forward. */
5268 ST.oldloc = locinput;
5270 locinput += UTF8SKIP(locinput);
5274 curly_try_B_min_known:
5275 /* find the next place where 'B' could work, then call B */
5279 n = (ST.oldloc == locinput) ? 0 : 1;
5280 if (ST.c1 == ST.c2) {
5282 /* set n to utf8_distance(oldloc, locinput) */
5283 while (locinput <= ST.maxpos &&
5284 utf8n_to_uvchr((U8*)locinput,
5285 UTF8_MAXBYTES, &len,
5286 uniflags) != (UV)ST.c1) {
5292 /* set n to utf8_distance(oldloc, locinput) */
5293 while (locinput <= ST.maxpos) {
5295 const UV c = utf8n_to_uvchr((U8*)locinput,
5296 UTF8_MAXBYTES, &len,
5298 if (c == (UV)ST.c1 || c == (UV)ST.c2)
5306 if (ST.c1 == ST.c2) {
5307 while (locinput <= ST.maxpos &&
5308 UCHARAT(locinput) != ST.c1)
5312 while (locinput <= ST.maxpos
5313 && UCHARAT(locinput) != ST.c1
5314 && UCHARAT(locinput) != ST.c2)
5317 n = locinput - ST.oldloc;
5319 if (locinput > ST.maxpos)
5321 /* PL_reginput == oldloc now */
5324 if (regrepeat(rex, ST.A, n, depth) < n)
5327 PL_reginput = locinput;
5328 CURLY_SETPAREN(ST.paren, ST.count);
5329 if (cur_eval && cur_eval->u.eval.close_paren &&
5330 cur_eval->u.eval.close_paren == (U32)ST.paren) {
5333 PUSH_STATE_GOTO(CURLY_B_min_known, ST.B);
5338 case CURLY_B_min_fail:
5339 /* failed to find B in a non-greedy match where c1,c2 invalid */
5340 if (ST.paren && ST.count)
5341 PL_regoffs[ST.paren].end = -1;
5343 REGCP_UNWIND(ST.cp);
5344 /* failed -- move forward one */
5345 PL_reginput = locinput;
5346 if (regrepeat(rex, ST.A, 1, depth)) {
5348 locinput = PL_reginput;
5349 if (ST.count <= ST.max || (ST.max == REG_INFTY &&
5350 ST.count > 0)) /* count overflow ? */
5353 CURLY_SETPAREN(ST.paren, ST.count);
5354 if (cur_eval && cur_eval->u.eval.close_paren &&
5355 cur_eval->u.eval.close_paren == (U32)ST.paren) {
5358 PUSH_STATE_GOTO(CURLY_B_min, ST.B);
5366 /* a successful greedy match: now try to match B */
5367 if (cur_eval && cur_eval->u.eval.close_paren &&
5368 cur_eval->u.eval.close_paren == (U32)ST.paren) {
5373 if (ST.c1 != CHRTEST_VOID)
5374 c = utf8_target ? utf8n_to_uvchr((U8*)PL_reginput,
5375 UTF8_MAXBYTES, 0, uniflags)
5376 : (UV) UCHARAT(PL_reginput);
5377 /* If it could work, try it. */
5378 if (ST.c1 == CHRTEST_VOID || c == (UV)ST.c1 || c == (UV)ST.c2) {
5379 CURLY_SETPAREN(ST.paren, ST.count);
5380 PUSH_STATE_GOTO(CURLY_B_max, ST.B);
5385 case CURLY_B_max_fail:
5386 /* failed to find B in a greedy match */
5387 if (ST.paren && ST.count)
5388 PL_regoffs[ST.paren].end = -1;
5390 REGCP_UNWIND(ST.cp);
5392 if (--ST.count < ST.min)
5394 PL_reginput = locinput = HOPc(locinput, -1);
5395 goto curly_try_B_max;
5402 /* we've just finished A in /(??{A})B/; now continue with B */
5404 st->u.eval.toggle_reg_flags
5405 = cur_eval->u.eval.toggle_reg_flags;
5406 PL_reg_flags ^= st->u.eval.toggle_reg_flags;
5408 st->u.eval.prev_rex = rex_sv; /* inner */
5409 SETREX(rex_sv,cur_eval->u.eval.prev_rex);
5410 rex = (struct regexp *)SvANY(rex_sv);
5411 rexi = RXi_GET(rex);
5412 cur_curlyx = cur_eval->u.eval.prev_curlyx;
5413 (void)ReREFCNT_inc(rex_sv);
5414 st->u.eval.cp = regcppush(0); /* Save *all* the positions. */
5416 /* rex was changed so update the pointer in PL_reglastparen and PL_reglastcloseparen */
5417 PL_reglastparen = &rex->lastparen;
5418 PL_reglastcloseparen = &rex->lastcloseparen;
5420 REGCP_SET(st->u.eval.lastcp);
5421 PL_reginput = locinput;
5423 /* Restore parens of the outer rex without popping the
5425 tmpix = PL_savestack_ix;
5426 PL_savestack_ix = cur_eval->u.eval.lastcp;
5428 PL_savestack_ix = tmpix;
5430 st->u.eval.prev_eval = cur_eval;
5431 cur_eval = cur_eval->u.eval.prev_eval;
5433 PerlIO_printf(Perl_debug_log, "%*s EVAL trying tail ... %"UVxf"\n",
5434 REPORT_CODE_OFF+depth*2, "",PTR2UV(cur_eval)););
5435 if ( nochange_depth )
5438 PUSH_YES_STATE_GOTO(EVAL_AB,
5439 st->u.eval.prev_eval->u.eval.B); /* match B */
5442 if (locinput < reginfo->till) {
5443 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
5444 "%sMatch possible, but length=%ld is smaller than requested=%ld, failing!%s\n",
5446 (long)(locinput - PL_reg_starttry),
5447 (long)(reginfo->till - PL_reg_starttry),
5450 sayNO_SILENT; /* Cannot match: too short. */
5452 PL_reginput = locinput; /* put where regtry can find it */
5453 sayYES; /* Success! */
5455 case SUCCEED: /* successful SUSPEND/UNLESSM/IFMATCH/CURLYM */
5457 PerlIO_printf(Perl_debug_log,
5458 "%*s %ssubpattern success...%s\n",
5459 REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5]));
5460 PL_reginput = locinput; /* put where regtry can find it */
5461 sayYES; /* Success! */
5464 #define ST st->u.ifmatch
5466 case SUSPEND: /* (?>A) */
5468 PL_reginput = locinput;
5471 case UNLESSM: /* -ve lookaround: (?!A), or with flags, (?<!A) */
5473 goto ifmatch_trivial_fail_test;
5475 case IFMATCH: /* +ve lookaround: (?=A), or with flags, (?<=A) */
5477 ifmatch_trivial_fail_test:
5479 char * const s = HOPBACKc(locinput, scan->flags);
5484 sw = 1 - cBOOL(ST.wanted);
5488 next = scan + ARG(scan);
5496 PL_reginput = locinput;
5500 ST.logical = logical;
5501 logical = 0; /* XXX: reset state of logical once it has been saved into ST */
5503 /* execute body of (?...A) */
5504 PUSH_YES_STATE_GOTO(IFMATCH_A, NEXTOPER(NEXTOPER(scan)));
5507 case IFMATCH_A_fail: /* body of (?...A) failed */
5508 ST.wanted = !ST.wanted;
5511 case IFMATCH_A: /* body of (?...A) succeeded */
5513 sw = cBOOL(ST.wanted);
5515 else if (!ST.wanted)
5518 if (OP(ST.me) == SUSPEND)
5519 locinput = PL_reginput;
5521 locinput = PL_reginput = st->locinput;
5522 nextchr = UCHARAT(locinput);
5524 scan = ST.me + ARG(ST.me);
5527 continue; /* execute B */
5532 next = scan + ARG(scan);
5537 reginfo->cutpoint = PL_regeol;
5540 PL_reginput = locinput;
5542 sv_yes_mark = sv_commit = MUTABLE_SV(rexi->data->data[ ARG( scan ) ]);
5543 PUSH_STATE_GOTO(COMMIT_next,next);
5545 case COMMIT_next_fail:
5552 #define ST st->u.mark
5554 ST.prev_mark = mark_state;
5555 ST.mark_name = sv_commit = sv_yes_mark
5556 = MUTABLE_SV(rexi->data->data[ ARG( scan ) ]);
5558 ST.mark_loc = PL_reginput = locinput;
5559 PUSH_YES_STATE_GOTO(MARKPOINT_next,next);
5561 case MARKPOINT_next:
5562 mark_state = ST.prev_mark;
5565 case MARKPOINT_next_fail:
5566 if (popmark && sv_eq(ST.mark_name,popmark))
5568 if (ST.mark_loc > startpoint)
5569 reginfo->cutpoint = HOPBACKc(ST.mark_loc, 1);
5570 popmark = NULL; /* we found our mark */
5571 sv_commit = ST.mark_name;
5574 PerlIO_printf(Perl_debug_log,
5575 "%*s %ssetting cutpoint to mark:%"SVf"...%s\n",
5576 REPORT_CODE_OFF+depth*2, "",
5577 PL_colors[4], SVfARG(sv_commit), PL_colors[5]);
5580 mark_state = ST.prev_mark;
5581 sv_yes_mark = mark_state ?
5582 mark_state->u.mark.mark_name : NULL;
5586 PL_reginput = locinput;
5588 /* (*SKIP) : if we fail we cut here*/
5589 ST.mark_name = NULL;
5590 ST.mark_loc = locinput;
5591 PUSH_STATE_GOTO(SKIP_next,next);
5593 /* (*SKIP:NAME) : if there is a (*MARK:NAME) fail where it was,
5594 otherwise do nothing. Meaning we need to scan
5596 regmatch_state *cur = mark_state;
5597 SV *find = MUTABLE_SV(rexi->data->data[ ARG( scan ) ]);
5600 if ( sv_eq( cur->u.mark.mark_name,
5603 ST.mark_name = find;
5604 PUSH_STATE_GOTO( SKIP_next, next );
5606 cur = cur->u.mark.prev_mark;
5609 /* Didn't find our (*MARK:NAME) so ignore this (*SKIP:NAME) */
5611 case SKIP_next_fail:
5613 /* (*CUT:NAME) - Set up to search for the name as we
5614 collapse the stack*/
5615 popmark = ST.mark_name;
5617 /* (*CUT) - No name, we cut here.*/
5618 if (ST.mark_loc > startpoint)
5619 reginfo->cutpoint = HOPBACKc(ST.mark_loc, 1);
5620 /* but we set sv_commit to latest mark_name if there
5621 is one so they can test to see how things lead to this
5624 sv_commit=mark_state->u.mark.mark_name;
5632 if ( n == (U32)what_len_TRICKYFOLD(locinput,utf8_target,ln) ) {
5634 } else if ( LATIN_SMALL_LETTER_SHARP_S == n && !utf8_target && !UTF_PATTERN ) {
5637 U8 folded[UTF8_MAXBYTES_CASE+1];
5639 const char * const l = locinput;
5640 char *e = PL_regeol;
5641 to_uni_fold(n, folded, &foldlen);
5643 if (! foldEQ_utf8((const char*) folded, 0, foldlen, 1,
5644 l, &e, 0, utf8_target)) {
5649 nextchr = UCHARAT(locinput);
5652 if ((n=is_LNBREAK(locinput,utf8_target))) {
5654 nextchr = UCHARAT(locinput);
5659 #define CASE_CLASS(nAmE) \
5661 if ((n=is_##nAmE(locinput,utf8_target))) { \
5663 nextchr = UCHARAT(locinput); \
5668 if ((n=is_##nAmE(locinput,utf8_target))) { \
5671 locinput += UTF8SKIP(locinput); \
5672 nextchr = UCHARAT(locinput); \
5677 CASE_CLASS(HORIZWS);
5681 PerlIO_printf(Perl_error_log, "%"UVxf" %d\n",
5682 PTR2UV(scan), OP(scan));
5683 Perl_croak(aTHX_ "regexp memory corruption");
5687 /* switch break jumps here */
5688 scan = next; /* prepare to execute the next op and ... */
5689 continue; /* ... jump back to the top, reusing st */
5693 /* push a state that backtracks on success */
5694 st->u.yes.prev_yes_state = yes_state;
5698 /* push a new regex state, then continue at scan */
5700 regmatch_state *newst;
5703 regmatch_state *cur = st;
5704 regmatch_state *curyes = yes_state;
5706 regmatch_slab *slab = PL_regmatch_slab;
5707 for (;curd > -1;cur--,curd--) {
5708 if (cur < SLAB_FIRST(slab)) {
5710 cur = SLAB_LAST(slab);
5712 PerlIO_printf(Perl_error_log, "%*s#%-3d %-10s %s\n",
5713 REPORT_CODE_OFF + 2 + depth * 2,"",
5714 curd, PL_reg_name[cur->resume_state],
5715 (curyes == cur) ? "yes" : ""
5718 curyes = cur->u.yes.prev_yes_state;
5721 DEBUG_STATE_pp("push")
5724 st->locinput = locinput;
5726 if (newst > SLAB_LAST(PL_regmatch_slab))
5727 newst = S_push_slab(aTHX);
5728 PL_regmatch_state = newst;
5730 locinput = PL_reginput;
5731 nextchr = UCHARAT(locinput);
5739 * We get here only if there's trouble -- normally "case END" is
5740 * the terminating point.
5742 Perl_croak(aTHX_ "corrupted regexp pointers");
5748 /* we have successfully completed a subexpression, but we must now
5749 * pop to the state marked by yes_state and continue from there */
5750 assert(st != yes_state);
5752 while (st != yes_state) {
5754 if (st < SLAB_FIRST(PL_regmatch_slab)) {
5755 PL_regmatch_slab = PL_regmatch_slab->prev;
5756 st = SLAB_LAST(PL_regmatch_slab);
5760 DEBUG_STATE_pp("pop (no final)");
5762 DEBUG_STATE_pp("pop (yes)");
5768 while (yes_state < SLAB_FIRST(PL_regmatch_slab)
5769 || yes_state > SLAB_LAST(PL_regmatch_slab))
5771 /* not in this slab, pop slab */
5772 depth -= (st - SLAB_FIRST(PL_regmatch_slab) + 1);
5773 PL_regmatch_slab = PL_regmatch_slab->prev;
5774 st = SLAB_LAST(PL_regmatch_slab);
5776 depth -= (st - yes_state);
5779 yes_state = st->u.yes.prev_yes_state;
5780 PL_regmatch_state = st;
5783 locinput= st->locinput;
5784 nextchr = UCHARAT(locinput);
5786 state_num = st->resume_state + no_final;
5787 goto reenter_switch;
5790 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch successful!%s\n",
5791 PL_colors[4], PL_colors[5]));
5793 if (PL_reg_eval_set) {
5794 /* each successfully executed (?{...}) block does the equivalent of
5795 * local $^R = do {...}
5796 * When popping the save stack, all these locals would be undone;
5797 * bypass this by setting the outermost saved $^R to the latest
5799 if (oreplsv != GvSV(PL_replgv))
5800 sv_setsv(oreplsv, GvSV(PL_replgv));
5807 PerlIO_printf(Perl_debug_log,
5808 "%*s %sfailed...%s\n",
5809 REPORT_CODE_OFF+depth*2, "",
5810 PL_colors[4], PL_colors[5])
5822 /* there's a previous state to backtrack to */
5824 if (st < SLAB_FIRST(PL_regmatch_slab)) {
5825 PL_regmatch_slab = PL_regmatch_slab->prev;
5826 st = SLAB_LAST(PL_regmatch_slab);
5828 PL_regmatch_state = st;
5829 locinput= st->locinput;
5830 nextchr = UCHARAT(locinput);
5832 DEBUG_STATE_pp("pop");
5834 if (yes_state == st)
5835 yes_state = st->u.yes.prev_yes_state;
5837 state_num = st->resume_state + 1; /* failure = success + 1 */
5838 goto reenter_switch;
5843 if (rex->intflags & PREGf_VERBARG_SEEN) {
5844 SV *sv_err = get_sv("REGERROR", 1);
5845 SV *sv_mrk = get_sv("REGMARK", 1);
5847 sv_commit = &PL_sv_no;
5849 sv_yes_mark = &PL_sv_yes;
5852 sv_commit = &PL_sv_yes;
5853 sv_yes_mark = &PL_sv_no;
5855 sv_setsv(sv_err, sv_commit);
5856 sv_setsv(sv_mrk, sv_yes_mark);
5859 /* clean up; in particular, free all slabs above current one */
5860 LEAVE_SCOPE(oldsave);
5866 - regrepeat - repeatedly match something simple, report how many
5869 * [This routine now assumes that it will only match on things of length 1.
5870 * That was true before, but now we assume scan - reginput is the count,
5871 * rather than incrementing count on every character. [Er, except utf8.]]
5874 S_regrepeat(pTHX_ const regexp *prog, const regnode *p, I32 max, int depth)
5877 register char *scan;
5879 register char *loceol = PL_regeol;
5880 register I32 hardcount = 0;
5881 register bool utf8_target = PL_reg_match_utf8;
5884 PERL_UNUSED_ARG(depth);
5887 PERL_ARGS_ASSERT_REGREPEAT;
5890 if (max == REG_INFTY)
5892 else if (max < loceol - scan)
5893 loceol = scan + max;
5898 while (scan < loceol && hardcount < max && *scan != '\n') {
5899 scan += UTF8SKIP(scan);
5903 while (scan < loceol && *scan != '\n')
5910 while (scan < loceol && hardcount < max) {
5911 scan += UTF8SKIP(scan);
5922 /* To get here, EXACTish nodes must have *byte* length == 1. That
5923 * means they match only characters in the string that can be expressed
5924 * as a single byte. For non-utf8 strings, that means a simple match.
5925 * For utf8 strings, the character matched must be an invariant, or
5926 * downgradable to a single byte. The pattern's utf8ness is
5927 * irrelevant, as since it's a single byte, it either isn't utf8, or if
5928 * it is, it's an invariant */
5931 assert(! UTF_PATTERN || UNI_IS_INVARIANT(c));
5933 if (! utf8_target || UNI_IS_INVARIANT(c)) {
5934 while (scan < loceol && UCHARAT(scan) == c) {
5940 /* Here, the string is utf8, and the pattern char is different
5941 * in utf8 than not, so can't compare them directly. Outside the
5942 * loop, find find the two utf8 bytes that represent c, and then
5943 * look for those in sequence in the utf8 string */
5944 U8 high = UTF8_TWO_BYTE_HI(c);
5945 U8 low = UTF8_TWO_BYTE_LO(c);
5948 while (hardcount < max
5949 && scan + 1 < loceol
5950 && UCHARAT(scan) == high
5951 && UCHARAT(scan + 1) == low)
5959 utf8_flags = FOLDEQ_UTF8_NOMIX_ASCII;
5963 PL_reg_flags |= RF_tainted;
5964 utf8_flags = FOLDEQ_UTF8_LOCALE;
5971 /* The comments for the EXACT case above apply as well to these fold
5976 assert(! UTF_PATTERN || UNI_IS_INVARIANT(c));
5978 if (utf8_target) { /* Use full Unicode fold matching */
5979 char *tmpeol = loceol;
5980 while (hardcount < max
5981 && foldEQ_utf8_flags(scan, &tmpeol, 0, utf8_target,
5982 STRING(p), NULL, 1, cBOOL(UTF_PATTERN), utf8_flags))
5989 /* XXX Note that the above handles properly the German sharp s in
5990 * the pattern matching ss in the string. But it doesn't handle
5991 * properly cases where the string contains say 'LIGATURE ff' and
5992 * the pattern is 'f+'. This would require, say, a new function or
5993 * revised interface to foldEQ_utf8(), in which the maximum number
5994 * of characters to match could be passed and it would return how
5995 * many actually did. This is just one of many cases where
5996 * multi-char folds don't work properly, and so the fix is being
6002 /* Here, the string isn't utf8 and c is a single byte; and either
6003 * the pattern isn't utf8 or c is an invariant, so its utf8ness
6004 * doesn't affect c. Can just do simple comparisons for exact or
6007 case EXACTF: folded = PL_fold[c]; break;
6009 case EXACTFU: folded = PL_fold_latin1[c]; break;
6010 case EXACTFL: folded = PL_fold_locale[c]; break;
6011 default: Perl_croak(aTHX_ "panic: Unexpected op %u", OP(p));
6013 while (scan < loceol &&
6014 (UCHARAT(scan) == c || UCHARAT(scan) == folded))
6022 if (utf8_target || OP(p) == ANYOFV) {
6025 inclasslen = loceol - scan;
6026 while (hardcount < max
6027 && ((inclasslen = loceol - scan) > 0)
6028 && reginclass(prog, p, (U8*)scan, &inclasslen, utf8_target))
6034 while (scan < loceol && REGINCLASS(prog, p, (U8*)scan))
6042 LOAD_UTF8_CHARCLASS_ALNUM();
6043 while (hardcount < max && scan < loceol &&
6044 swash_fetch(PL_utf8_alnum, (U8*)scan, utf8_target))
6046 scan += UTF8SKIP(scan);
6050 while (scan < loceol && isWORDCHAR_L1((U8) *scan)) {
6058 while (scan < loceol && isALNUM((U8) *scan)) {
6063 while (scan < loceol && isWORDCHAR_A((U8) *scan)) {
6068 PL_reg_flags |= RF_tainted;
6071 while (hardcount < max && scan < loceol &&
6072 isALNUM_LC_utf8((U8*)scan)) {
6073 scan += UTF8SKIP(scan);
6077 while (scan < loceol && isALNUM_LC(*scan))
6087 LOAD_UTF8_CHARCLASS_ALNUM();
6088 while (hardcount < max && scan < loceol &&
6089 ! swash_fetch(PL_utf8_alnum, (U8*)scan, utf8_target))
6091 scan += UTF8SKIP(scan);
6095 while (scan < loceol && ! isWORDCHAR_L1((U8) *scan)) {
6102 goto utf8_Nwordchar;
6103 while (scan < loceol && ! isALNUM((U8) *scan)) {
6109 while (scan < loceol && ! isWORDCHAR_A((U8) *scan)) {
6110 scan += UTF8SKIP(scan);
6114 while (scan < loceol && ! isWORDCHAR_A((U8) *scan)) {
6120 PL_reg_flags |= RF_tainted;
6123 while (hardcount < max && scan < loceol &&
6124 !isALNUM_LC_utf8((U8*)scan)) {
6125 scan += UTF8SKIP(scan);
6129 while (scan < loceol && !isALNUM_LC(*scan))
6139 LOAD_UTF8_CHARCLASS_SPACE();
6140 while (hardcount < max && scan < loceol &&
6142 swash_fetch(PL_utf8_space,(U8*)scan, utf8_target)))
6144 scan += UTF8SKIP(scan);
6150 while (scan < loceol && isSPACE_L1((U8) *scan)) {
6159 while (scan < loceol && isSPACE((U8) *scan)) {
6164 while (scan < loceol && isSPACE_A((U8) *scan)) {
6169 PL_reg_flags |= RF_tainted;
6172 while (hardcount < max && scan < loceol &&
6173 isSPACE_LC_utf8((U8*)scan)) {
6174 scan += UTF8SKIP(scan);
6178 while (scan < loceol && isSPACE_LC(*scan))
6188 LOAD_UTF8_CHARCLASS_SPACE();
6189 while (hardcount < max && scan < loceol &&
6191 swash_fetch(PL_utf8_space,(U8*)scan, utf8_target)))
6193 scan += UTF8SKIP(scan);
6199 while (scan < loceol && ! isSPACE_L1((U8) *scan)) {
6208 while (scan < loceol && ! isSPACE((U8) *scan)) {
6214 while (scan < loceol && ! isSPACE_A((U8) *scan)) {
6215 scan += UTF8SKIP(scan);
6219 while (scan < loceol && ! isSPACE_A((U8) *scan)) {
6225 PL_reg_flags |= RF_tainted;
6228 while (hardcount < max && scan < loceol &&
6229 !isSPACE_LC_utf8((U8*)scan)) {
6230 scan += UTF8SKIP(scan);
6234 while (scan < loceol && !isSPACE_LC(*scan))
6241 LOAD_UTF8_CHARCLASS_DIGIT();
6242 while (hardcount < max && scan < loceol &&
6243 swash_fetch(PL_utf8_digit, (U8*)scan, utf8_target)) {
6244 scan += UTF8SKIP(scan);
6248 while (scan < loceol && isDIGIT(*scan))
6253 while (scan < loceol && isDIGIT_A((U8) *scan)) {
6258 PL_reg_flags |= RF_tainted;
6261 while (hardcount < max && scan < loceol &&
6262 isDIGIT_LC_utf8((U8*)scan)) {
6263 scan += UTF8SKIP(scan);
6267 while (scan < loceol && isDIGIT_LC(*scan))
6274 LOAD_UTF8_CHARCLASS_DIGIT();
6275 while (hardcount < max && scan < loceol &&
6276 !swash_fetch(PL_utf8_digit, (U8*)scan, utf8_target)) {
6277 scan += UTF8SKIP(scan);
6281 while (scan < loceol && !isDIGIT(*scan))
6287 while (scan < loceol && ! isDIGIT_A((U8) *scan)) {
6288 scan += UTF8SKIP(scan);
6292 while (scan < loceol && ! isDIGIT_A((U8) *scan)) {
6298 PL_reg_flags |= RF_tainted;
6301 while (hardcount < max && scan < loceol &&
6302 !isDIGIT_LC_utf8((U8*)scan)) {
6303 scan += UTF8SKIP(scan);
6307 while (scan < loceol && !isDIGIT_LC(*scan))
6314 while (hardcount < max && scan < loceol && (c=is_LNBREAK_utf8(scan))) {
6320 LNBREAK can match two latin chars, which is ok,
6321 because we have a null terminated string, but we
6322 have to use hardcount in this situation
6324 while (scan < loceol && (c=is_LNBREAK_latin1(scan))) {
6333 while (hardcount < max && scan < loceol && (c=is_HORIZWS_utf8(scan))) {
6338 while (scan < loceol && is_HORIZWS_latin1(scan))
6345 while (hardcount < max && scan < loceol && !is_HORIZWS_utf8(scan)) {
6346 scan += UTF8SKIP(scan);
6350 while (scan < loceol && !is_HORIZWS_latin1(scan))
6358 while (hardcount < max && scan < loceol && (c=is_VERTWS_utf8(scan))) {
6363 while (scan < loceol && is_VERTWS_latin1(scan))
6371 while (hardcount < max && scan < loceol && !is_VERTWS_utf8(scan)) {
6372 scan += UTF8SKIP(scan);
6376 while (scan < loceol && !is_VERTWS_latin1(scan))
6382 default: /* Called on something of 0 width. */
6383 break; /* So match right here or not at all. */
6389 c = scan - PL_reginput;
6393 GET_RE_DEBUG_FLAGS_DECL;
6395 SV * const prop = sv_newmortal();
6396 regprop(prog, prop, p);
6397 PerlIO_printf(Perl_debug_log,
6398 "%*s %s can match %"IVdf" times out of %"IVdf"...\n",
6399 REPORT_CODE_OFF + depth*2, "", SvPVX_const(prop),(IV)c,(IV)max);
6407 #if !defined(PERL_IN_XSUB_RE) || defined(PLUGGABLE_RE_EXTENSION)
6409 - regclass_swash - prepare the utf8 swash
6413 Perl_regclass_swash(pTHX_ const regexp *prog, register const regnode* node, bool doinit, SV** listsvp, SV **altsvp)
6419 RXi_GET_DECL(prog,progi);
6420 const struct reg_data * const data = prog ? progi->data : NULL;
6422 PERL_ARGS_ASSERT_REGCLASS_SWASH;
6424 assert(ANYOF_NONBITMAP(node));
6426 if (data && data->count) {
6427 const U32 n = ARG(node);
6429 if (data->what[n] == 's') {
6430 SV * const rv = MUTABLE_SV(data->data[n]);
6431 AV * const av = MUTABLE_AV(SvRV(rv));
6432 SV **const ary = AvARRAY(av);
6435 /* See the end of regcomp.c:S_regclass() for
6436 * documentation of these array elements. */
6439 a = SvROK(ary[1]) ? &ary[1] : NULL;
6440 b = SvTYPE(ary[2]) == SVt_PVAV ? &ary[2] : NULL;
6444 else if (si && doinit) {
6445 sw = swash_init("utf8", "", si, 1, 0);
6446 (void)av_store(av, 1, sw);
6463 - reginclass - determine if a character falls into a character class
6465 n is the ANYOF regnode
6466 p is the target string
6467 lenp is pointer to the maximum number of bytes of how far to go in p
6468 (This is assumed wthout checking to always be at least the current
6470 utf8_target tells whether p is in UTF-8.
6472 Returns true if matched; false otherwise. If lenp is not NULL, on return
6473 from a successful match, the value it points to will be updated to how many
6474 bytes in p were matched. If there was no match, the value is undefined,
6475 possibly changed from the input.
6477 Note that this can be a synthetic start class, a combination of various
6478 nodes, so things you think might be mutually exclusive, such as locale,
6479 aren't. It can match both locale and non-locale
6484 S_reginclass(pTHX_ const regexp * const prog, register const regnode * const n, register const U8* const p, STRLEN* lenp, register const bool utf8_target)
6487 const char flags = ANYOF_FLAGS(n);
6493 PERL_ARGS_ASSERT_REGINCLASS;
6495 /* If c is not already the code point, get it */
6496 if (utf8_target && !UTF8_IS_INVARIANT(c)) {
6497 c = utf8n_to_uvchr(p, UTF8_MAXBYTES, &c_len,
6498 (UTF8_ALLOW_DEFAULT & UTF8_ALLOW_ANYUV)
6499 | UTF8_ALLOW_FFFF | UTF8_CHECK_ONLY);
6500 /* see [perl #37836] for UTF8_ALLOW_ANYUV; [perl #38293] for
6501 * UTF8_ALLOW_FFFF */
6502 if (c_len == (STRLEN)-1)
6503 Perl_croak(aTHX_ "Malformed UTF-8 character (fatal)");
6509 /* Use passed in max length, or one character if none passed in or less
6510 * than one character. And assume will match just one character. This is
6511 * overwritten later if matched more. */
6513 maxlen = (*lenp > c_len) ? *lenp : c_len;
6521 /* If this character is potentially in the bitmap, check it */
6523 if (ANYOF_BITMAP_TEST(n, c))
6525 else if (flags & ANYOF_NON_UTF8_LATIN1_ALL
6532 else if (flags & ANYOF_LOCALE) {
6533 PL_reg_flags |= RF_tainted;
6535 if ((flags & ANYOF_LOC_NONBITMAP_FOLD)
6536 && ANYOF_BITMAP_TEST(n, PL_fold_locale[c]))
6540 else if (ANYOF_CLASS_TEST_ANY_SET(n) &&
6541 ((ANYOF_CLASS_TEST(n, ANYOF_ALNUM) && isALNUM_LC(c)) ||
6542 (ANYOF_CLASS_TEST(n, ANYOF_NALNUM) && !isALNUM_LC(c)) ||
6543 (ANYOF_CLASS_TEST(n, ANYOF_SPACE) && isSPACE_LC(c)) ||
6544 (ANYOF_CLASS_TEST(n, ANYOF_NSPACE) && !isSPACE_LC(c)) ||
6545 (ANYOF_CLASS_TEST(n, ANYOF_DIGIT) && isDIGIT_LC(c)) ||
6546 (ANYOF_CLASS_TEST(n, ANYOF_NDIGIT) && !isDIGIT_LC(c)) ||
6547 (ANYOF_CLASS_TEST(n, ANYOF_ALNUMC) && isALNUMC_LC(c)) ||
6548 (ANYOF_CLASS_TEST(n, ANYOF_NALNUMC) && !isALNUMC_LC(c)) ||
6549 (ANYOF_CLASS_TEST(n, ANYOF_ALPHA) && isALPHA_LC(c)) ||
6550 (ANYOF_CLASS_TEST(n, ANYOF_NALPHA) && !isALPHA_LC(c)) ||
6551 (ANYOF_CLASS_TEST(n, ANYOF_ASCII) && isASCII(c)) ||
6552 (ANYOF_CLASS_TEST(n, ANYOF_NASCII) && !isASCII(c)) ||
6553 (ANYOF_CLASS_TEST(n, ANYOF_CNTRL) && isCNTRL_LC(c)) ||
6554 (ANYOF_CLASS_TEST(n, ANYOF_NCNTRL) && !isCNTRL_LC(c)) ||
6555 (ANYOF_CLASS_TEST(n, ANYOF_GRAPH) && isGRAPH_LC(c)) ||
6556 (ANYOF_CLASS_TEST(n, ANYOF_NGRAPH) && !isGRAPH_LC(c)) ||
6557 (ANYOF_CLASS_TEST(n, ANYOF_LOWER) && isLOWER_LC(c)) ||
6558 (ANYOF_CLASS_TEST(n, ANYOF_NLOWER) && !isLOWER_LC(c)) ||
6559 (ANYOF_CLASS_TEST(n, ANYOF_PRINT) && isPRINT_LC(c)) ||
6560 (ANYOF_CLASS_TEST(n, ANYOF_NPRINT) && !isPRINT_LC(c)) ||
6561 (ANYOF_CLASS_TEST(n, ANYOF_PUNCT) && isPUNCT_LC(c)) ||
6562 (ANYOF_CLASS_TEST(n, ANYOF_NPUNCT) && !isPUNCT_LC(c)) ||
6563 (ANYOF_CLASS_TEST(n, ANYOF_UPPER) && isUPPER_LC(c)) ||
6564 (ANYOF_CLASS_TEST(n, ANYOF_NUPPER) && !isUPPER_LC(c)) ||
6565 (ANYOF_CLASS_TEST(n, ANYOF_XDIGIT) && isXDIGIT(c)) ||
6566 (ANYOF_CLASS_TEST(n, ANYOF_NXDIGIT) && !isXDIGIT(c)) ||
6567 (ANYOF_CLASS_TEST(n, ANYOF_PSXSPC) && isPSXSPC(c)) ||
6568 (ANYOF_CLASS_TEST(n, ANYOF_NPSXSPC) && !isPSXSPC(c)) ||
6569 (ANYOF_CLASS_TEST(n, ANYOF_BLANK) && isBLANK(c)) ||
6570 (ANYOF_CLASS_TEST(n, ANYOF_NBLANK) && !isBLANK(c))
6571 ) /* How's that for a conditional? */
6578 /* If the bitmap didn't (or couldn't) match, and something outside the
6579 * bitmap could match, try that. Locale nodes specifiy completely the
6580 * behavior of code points in the bit map (otherwise, a utf8 target would
6581 * cause them to be treated as Unicode and not locale), except in
6582 * the very unlikely event when this node is a synthetic start class, which
6583 * could be a combination of locale and non-locale nodes. So allow locale
6584 * to match for the synthetic start class, which will give a false
6585 * positive that will be resolved when the match is done again as not part
6586 * of the synthetic start class */
6588 if (utf8_target && (flags & ANYOF_UNICODE_ALL) && c >= 256) {
6589 match = TRUE; /* Everything above 255 matches */
6591 else if (ANYOF_NONBITMAP(n)
6592 && ((flags & ANYOF_NONBITMAP_NON_UTF8)
6595 || (! (flags & ANYOF_LOCALE))
6596 || (flags & ANYOF_IS_SYNTHETIC)))))
6599 SV * const sw = regclass_swash(prog, n, TRUE, 0, (SV**)&av);
6607 /* Not utf8. Convert as much of the string as available up
6608 * to the limit of how far the (single) character in the
6609 * pattern can possibly match (no need to go further). If
6610 * the node is a straight ANYOF or not folding, it can't
6611 * match more than one. Otherwise, It can match up to how
6612 * far a single char can fold to. Since not utf8, each
6613 * character is a single byte, so the max it can be in
6614 * bytes is the same as the max it can be in characters */
6615 STRLEN len = (OP(n) == ANYOF
6616 || ! (flags & ANYOF_LOC_NONBITMAP_FOLD))
6618 : (maxlen < UTF8_MAX_FOLD_CHAR_EXPAND)
6620 : UTF8_MAX_FOLD_CHAR_EXPAND;
6621 utf8_p = bytes_to_utf8(p, &len);
6624 if (swash_fetch(sw, utf8_p, TRUE))
6626 else if (flags & ANYOF_LOC_NONBITMAP_FOLD) {
6628 /* Here, we need to test if the fold of the target string
6629 * matches. The non-multi char folds have all been moved to
6630 * the compilation phase, and the multi-char folds have
6631 * been stored by regcomp into 'av'; we linearly check to
6632 * see if any match the target string (folded). We know
6633 * that the originals were each one character, but we don't
6634 * currently know how many characters/bytes each folded to,
6635 * except we do know that there are small limits imposed by
6636 * Unicode. XXX A performance enhancement would be to have
6637 * regcomp.c store the max number of chars/bytes that are
6638 * in an av entry, as, say the 0th element. Even better
6639 * would be to have a hash of the few characters that can
6640 * start a multi-char fold to the max number of chars of
6643 * If there is a match, we will need to advance (if lenp is
6644 * specified) the match pointer in the target string. But
6645 * what we are comparing here isn't that string directly,
6646 * but its fold, whose length may differ from the original.
6647 * As we go along in constructing the fold, therefore, we
6648 * create a map so that we know how many bytes in the
6649 * source to advance given that we have matched a certain
6650 * number of bytes in the fold. This map is stored in
6651 * 'map_fold_len_back'. Let n mean the number of bytes in
6652 * the fold of the first character that we are folding.
6653 * Then map_fold_len_back[n] is set to the number of bytes
6654 * in that first character. Similarly let m be the
6655 * corresponding number for the second character to be
6656 * folded. Then map_fold_len_back[n+m] is set to the
6657 * number of bytes occupied by the first two source
6658 * characters. ... */
6659 U8 map_fold_len_back[UTF8_MAXBYTES_CASE+1] = { 0 };
6660 U8 folded[UTF8_MAXBYTES_CASE+1];
6661 STRLEN foldlen = 0; /* num bytes in fold of 1st char */
6662 STRLEN total_foldlen = 0; /* num bytes in fold of all
6665 if (OP(n) == ANYOF || maxlen == 1 || ! lenp || ! av) {
6667 /* Here, only need to fold the first char of the target
6668 * string. It the source wasn't utf8, is 1 byte long */
6669 to_utf8_fold(utf8_p, folded, &foldlen);
6670 total_foldlen = foldlen;
6671 map_fold_len_back[foldlen] = (utf8_target)
6677 /* Here, need to fold more than the first char. Do so
6678 * up to the limits */
6679 U8* source_ptr = utf8_p; /* The source for the fold
6682 U8* folded_ptr = folded;
6683 U8* e = utf8_p + maxlen; /* Can't go beyond last
6684 available byte in the
6688 i < UTF8_MAX_FOLD_CHAR_EXPAND && source_ptr < e;
6692 /* Fold the next character */
6693 U8 this_char_folded[UTF8_MAXBYTES_CASE+1];
6694 STRLEN this_char_foldlen;
6695 to_utf8_fold(source_ptr,
6697 &this_char_foldlen);
6699 /* Bail if it would exceed the byte limit for
6700 * folding a single char. */
6701 if (this_char_foldlen + folded_ptr - folded >
6707 /* Add the fold of this character */
6708 Copy(this_char_folded,
6712 source_ptr += UTF8SKIP(source_ptr);
6713 folded_ptr += this_char_foldlen;
6714 total_foldlen = folded_ptr - folded;
6716 /* Create map from the number of bytes in the fold
6717 * back to the number of bytes in the source. If
6718 * the source isn't utf8, the byte count is just
6719 * the number of characters so far */
6720 map_fold_len_back[total_foldlen]
6722 ? source_ptr - utf8_p
6729 /* Do the linear search to see if the fold is in the list
6730 * of multi-char folds. */
6733 for (i = 0; i <= av_len(av); i++) {
6734 SV* const sv = *av_fetch(av, i, FALSE);
6736 const char * const s = SvPV_const(sv, len);
6738 if (len <= total_foldlen
6739 && memEQ(s, (char*)folded, len)
6741 /* If 0, means matched a partial char. See
6743 && map_fold_len_back[len])
6746 /* Advance the target string ptr to account for
6747 * this fold, but have to translate from the
6748 * folded length to the corresponding source
6751 *lenp = map_fold_len_back[len];
6760 /* If we allocated a string above, free it */
6761 if (! utf8_target) Safefree(utf8_p);
6766 return (flags & ANYOF_INVERT) ? !match : match;
6770 S_reghop3(U8 *s, I32 off, const U8* lim)
6774 PERL_ARGS_ASSERT_REGHOP3;
6777 while (off-- && s < lim) {
6778 /* XXX could check well-formedness here */
6783 while (off++ && s > lim) {
6785 if (UTF8_IS_CONTINUED(*s)) {
6786 while (s > lim && UTF8_IS_CONTINUATION(*s))
6789 /* XXX could check well-formedness here */
6796 /* there are a bunch of places where we use two reghop3's that should
6797 be replaced with this routine. but since thats not done yet
6798 we ifdef it out - dmq
6801 S_reghop4(U8 *s, I32 off, const U8* llim, const U8* rlim)
6805 PERL_ARGS_ASSERT_REGHOP4;
6808 while (off-- && s < rlim) {
6809 /* XXX could check well-formedness here */
6814 while (off++ && s > llim) {
6816 if (UTF8_IS_CONTINUED(*s)) {
6817 while (s > llim && UTF8_IS_CONTINUATION(*s))
6820 /* XXX could check well-formedness here */
6828 S_reghopmaybe3(U8* s, I32 off, const U8* lim)
6832 PERL_ARGS_ASSERT_REGHOPMAYBE3;
6835 while (off-- && s < lim) {
6836 /* XXX could check well-formedness here */
6843 while (off++ && s > lim) {
6845 if (UTF8_IS_CONTINUED(*s)) {
6846 while (s > lim && UTF8_IS_CONTINUATION(*s))
6849 /* XXX could check well-formedness here */
6858 restore_pos(pTHX_ void *arg)
6861 regexp * const rex = (regexp *)arg;
6862 if (PL_reg_eval_set) {
6863 if (PL_reg_oldsaved) {
6864 rex->subbeg = PL_reg_oldsaved;
6865 rex->sublen = PL_reg_oldsavedlen;
6866 #ifdef PERL_OLD_COPY_ON_WRITE
6867 rex->saved_copy = PL_nrs;
6869 RXp_MATCH_COPIED_on(rex);
6871 PL_reg_magic->mg_len = PL_reg_oldpos;
6872 PL_reg_eval_set = 0;
6873 PL_curpm = PL_reg_oldcurpm;
6878 S_to_utf8_substr(pTHX_ register regexp *prog)
6882 PERL_ARGS_ASSERT_TO_UTF8_SUBSTR;
6885 if (prog->substrs->data[i].substr
6886 && !prog->substrs->data[i].utf8_substr) {
6887 SV* const sv = newSVsv(prog->substrs->data[i].substr);
6888 prog->substrs->data[i].utf8_substr = sv;
6889 sv_utf8_upgrade(sv);
6890 if (SvVALID(prog->substrs->data[i].substr)) {
6891 const U8 flags = BmFLAGS(prog->substrs->data[i].substr);
6892 if (flags & FBMcf_TAIL) {
6893 /* Trim the trailing \n that fbm_compile added last
6895 SvCUR_set(sv, SvCUR(sv) - 1);
6896 /* Whilst this makes the SV technically "invalid" (as its
6897 buffer is no longer followed by "\0") when fbm_compile()
6898 adds the "\n" back, a "\0" is restored. */
6900 fbm_compile(sv, flags);
6902 if (prog->substrs->data[i].substr == prog->check_substr)
6903 prog->check_utf8 = sv;
6909 S_to_byte_substr(pTHX_ register regexp *prog)
6914 PERL_ARGS_ASSERT_TO_BYTE_SUBSTR;
6917 if (prog->substrs->data[i].utf8_substr
6918 && !prog->substrs->data[i].substr) {
6919 SV* sv = newSVsv(prog->substrs->data[i].utf8_substr);
6920 if (sv_utf8_downgrade(sv, TRUE)) {
6921 if (SvVALID(prog->substrs->data[i].utf8_substr)) {
6923 = BmFLAGS(prog->substrs->data[i].utf8_substr);
6924 if (flags & FBMcf_TAIL) {
6925 /* Trim the trailing \n that fbm_compile added last
6927 SvCUR_set(sv, SvCUR(sv) - 1);
6929 fbm_compile(sv, flags);
6935 prog->substrs->data[i].substr = sv;
6936 if (prog->substrs->data[i].utf8_substr == prog->check_utf8)
6937 prog->check_substr = sv;
6944 * c-indentation-style: bsd
6946 * indent-tabs-mode: t
6949 * ex: set ts=8 sts=4 sw=4 noet: