5 * "One Ring to rule them all, One Ring to find them..."
8 /* This file contains functions for executing a regular expression. See
9 * also regcomp.c which funnily enough, contains functions for compiling
10 * a regular expression.
12 * This file is also copied at build time to ext/re/re_exec.c, where
13 * it's built with -DPERL_EXT_RE_BUILD -DPERL_EXT_RE_DEBUG -DPERL_EXT.
14 * This causes the main functions to be compiled under new names and with
15 * debugging support added, which makes "use re 'debug'" work.
18 /* NOTE: this is derived from Henry Spencer's regexp code, and should not
19 * confused with the original package (see point 3 below). Thanks, Henry!
22 /* Additional note: this code is very heavily munged from Henry's version
23 * in places. In some spots I've traded clarity for efficiency, so don't
24 * blame Henry for some of the lack of readability.
27 /* The names of the functions have been changed from regcomp and
28 * regexec to pregcomp and pregexec in order to avoid conflicts
29 * with the POSIX routines of the same names.
32 #ifdef PERL_EXT_RE_BUILD
37 * pregcomp and pregexec -- regsub and regerror are not used in perl
39 * Copyright (c) 1986 by University of Toronto.
40 * Written by Henry Spencer. Not derived from licensed software.
42 * Permission is granted to anyone to use this software for any
43 * purpose on any computer system, and to redistribute it freely,
44 * subject to the following restrictions:
46 * 1. The author is not responsible for the consequences of use of
47 * this software, no matter how awful, even if they arise
50 * 2. The origin of this software must not be misrepresented, either
51 * by explicit claim or by omission.
53 * 3. Altered versions must be plainly marked as such, and must not
54 * be misrepresented as being the original software.
56 **** Alterations to Henry's code are...
58 **** Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
59 **** 2000, 2001, 2002, 2003, 2004, 2005, 2006, by Larry Wall and others
61 **** You may distribute under the terms of either the GNU General Public
62 **** License or the Artistic License, as specified in the README file.
64 * Beware that some of this code is subtly aware of the way operator
65 * precedence is structured in regular expressions. Serious changes in
66 * regular-expression syntax might require a total rethink.
69 #define PERL_IN_REGEXEC_C
72 #ifdef PERL_IN_XSUB_RE
78 #define RF_tainted 1 /* tainted information used? */
79 #define RF_warned 2 /* warned about big count? */
81 #define RF_utf8 8 /* Pattern contains multibyte chars? */
83 #define UTF ((PL_reg_flags & RF_utf8) != 0)
85 #define RS_init 1 /* eval environment created */
86 #define RS_set 2 /* replsv value is set */
92 #define REGINCLASS(prog,p,c) (ANYOF_FLAGS(p) ? reginclass(prog,p,c,0,0) : ANYOF_BITMAP_TEST(p,*(c)))
98 #define CHR_SVLEN(sv) (do_utf8 ? sv_len_utf8(sv) : SvCUR(sv))
99 #define CHR_DIST(a,b) (PL_reg_match_utf8 ? utf8_distance(a,b) : a - b)
101 #define HOPc(pos,off) \
102 (char *)(PL_reg_match_utf8 \
103 ? reghop3((U8*)pos, off, (U8*)(off >= 0 ? PL_regeol : PL_bostr)) \
105 #define HOPBACKc(pos, off) \
106 (char*)(PL_reg_match_utf8\
107 ? reghopmaybe3((U8*)pos, -off, (U8*)PL_bostr) \
108 : (pos - off >= PL_bostr) \
112 #define HOP3(pos,off,lim) (PL_reg_match_utf8 ? reghop3((U8*)(pos), off, (U8*)(lim)) : (U8*)(pos + off))
113 #define HOP3c(pos,off,lim) ((char*)HOP3(pos,off,lim))
115 #define LOAD_UTF8_CHARCLASS(class,str) STMT_START { \
116 if (!CAT2(PL_utf8_,class)) { bool ok; ENTER; save_re_context(); ok=CAT2(is_utf8_,class)((const U8*)str); assert(ok); LEAVE; } } STMT_END
117 #define LOAD_UTF8_CHARCLASS_ALNUM() LOAD_UTF8_CHARCLASS(alnum,"a")
118 #define LOAD_UTF8_CHARCLASS_DIGIT() LOAD_UTF8_CHARCLASS(digit,"0")
119 #define LOAD_UTF8_CHARCLASS_SPACE() LOAD_UTF8_CHARCLASS(space," ")
120 #define LOAD_UTF8_CHARCLASS_MARK() LOAD_UTF8_CHARCLASS(mark, "\xcd\x86")
122 /* TODO: Combine JUMPABLE and HAS_TEXT to cache OP(rn) */
124 /* for use after a quantifier and before an EXACT-like node -- japhy */
125 #define JUMPABLE(rn) ( \
126 OP(rn) == OPEN || OP(rn) == CLOSE || OP(rn) == EVAL || \
127 OP(rn) == SUSPEND || OP(rn) == IFMATCH || \
128 OP(rn) == PLUS || OP(rn) == MINMOD || \
129 (PL_regkind[OP(rn)] == CURLY && ARG1(rn) > 0) \
132 #define HAS_TEXT(rn) ( \
133 PL_regkind[OP(rn)] == EXACT || PL_regkind[OP(rn)] == REF \
137 Search for mandatory following text node; for lookahead, the text must
138 follow but for lookbehind (rn->flags != 0) we skip to the next step.
140 #define FIND_NEXT_IMPT(rn) STMT_START { \
141 while (JUMPABLE(rn)) { \
142 const OPCODE type = OP(rn); \
143 if (type == SUSPEND || PL_regkind[type] == CURLY) \
144 rn = NEXTOPER(NEXTOPER(rn)); \
145 else if (type == PLUS) \
147 else if (type == IFMATCH) \
148 rn = (rn->flags == 0) ? NEXTOPER(NEXTOPER(rn)) : rn + ARG(rn); \
149 else rn += NEXT_OFF(rn); \
154 static void restore_pos(pTHX_ void *arg);
157 S_regcppush(pTHX_ I32 parenfloor)
160 const int retval = PL_savestack_ix;
161 #define REGCP_PAREN_ELEMS 4
162 const int paren_elems_to_push = (PL_regsize - parenfloor) * REGCP_PAREN_ELEMS;
164 GET_RE_DEBUG_FLAGS_DECL;
166 if (paren_elems_to_push < 0)
167 Perl_croak(aTHX_ "panic: paren_elems_to_push < 0");
169 #define REGCP_OTHER_ELEMS 8
170 SSGROW(paren_elems_to_push + REGCP_OTHER_ELEMS);
172 for (p = PL_regsize; p > parenfloor; p--) {
173 /* REGCP_PARENS_ELEMS are pushed per pairs of parentheses. */
174 SSPUSHINT(PL_regendp[p]);
175 SSPUSHINT(PL_regstartp[p]);
176 SSPUSHPTR(PL_reg_start_tmp[p]);
178 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
179 " saving \\%"UVuf" %"IVdf"(%"IVdf")..%"IVdf"\n",
180 (UV)p, (IV)PL_regstartp[p],
181 (IV)(PL_reg_start_tmp[p] - PL_bostr),
185 /* REGCP_OTHER_ELEMS are pushed in any case, parentheses or no. */
186 SSPUSHPTR(PL_regstartp);
187 SSPUSHPTR(PL_regendp);
188 SSPUSHINT(PL_regsize);
189 SSPUSHINT(*PL_reglastparen);
190 SSPUSHINT(*PL_reglastcloseparen);
191 SSPUSHPTR(PL_reginput);
192 #define REGCP_FRAME_ELEMS 2
193 /* REGCP_FRAME_ELEMS are part of the REGCP_OTHER_ELEMS and
194 * are needed for the regexp context stack bookkeeping. */
195 SSPUSHINT(paren_elems_to_push + REGCP_OTHER_ELEMS - REGCP_FRAME_ELEMS);
196 SSPUSHINT(SAVEt_REGCONTEXT); /* Magic cookie. */
201 /* These are needed since we do not localize EVAL nodes: */
202 #define REGCP_SET(cp) \
204 PerlIO_printf(Perl_debug_log, \
205 " Setting an EVAL scope, savestack=%"IVdf"\n", \
206 (IV)PL_savestack_ix)); \
209 #define REGCP_UNWIND(cp) \
211 if (cp != PL_savestack_ix) \
212 PerlIO_printf(Perl_debug_log, \
213 " Clearing an EVAL scope, savestack=%"IVdf"..%"IVdf"\n", \
214 (IV)(cp), (IV)PL_savestack_ix)); \
218 S_regcppop(pTHX_ const regexp *rex)
224 GET_RE_DEBUG_FLAGS_DECL;
226 /* Pop REGCP_OTHER_ELEMS before the parentheses loop starts. */
228 assert(i == SAVEt_REGCONTEXT); /* Check that the magic cookie is there. */
229 i = SSPOPINT; /* Parentheses elements to pop. */
230 input = (char *) SSPOPPTR;
231 *PL_reglastcloseparen = SSPOPINT;
232 *PL_reglastparen = SSPOPINT;
233 PL_regsize = SSPOPINT;
234 PL_regendp=(I32 *) SSPOPPTR;
235 PL_regstartp=(I32 *) SSPOPPTR;
238 /* Now restore the parentheses context. */
239 for (i -= (REGCP_OTHER_ELEMS - REGCP_FRAME_ELEMS);
240 i > 0; i -= REGCP_PAREN_ELEMS) {
242 U32 paren = (U32)SSPOPINT;
243 PL_reg_start_tmp[paren] = (char *) SSPOPPTR;
244 PL_regstartp[paren] = SSPOPINT;
246 if (paren <= *PL_reglastparen)
247 PL_regendp[paren] = tmps;
249 PerlIO_printf(Perl_debug_log,
250 " restoring \\%"UVuf" to %"IVdf"(%"IVdf")..%"IVdf"%s\n",
251 (UV)paren, (IV)PL_regstartp[paren],
252 (IV)(PL_reg_start_tmp[paren] - PL_bostr),
253 (IV)PL_regendp[paren],
254 (paren > *PL_reglastparen ? "(no)" : ""));
258 if (*PL_reglastparen + 1 <= rex->nparens) {
259 PerlIO_printf(Perl_debug_log,
260 " restoring \\%"IVdf"..\\%"IVdf" to undef\n",
261 (IV)(*PL_reglastparen + 1), (IV)rex->nparens);
265 /* It would seem that the similar code in regtry()
266 * already takes care of this, and in fact it is in
267 * a better location to since this code can #if 0-ed out
268 * but the code in regtry() is needed or otherwise tests
269 * requiring null fields (pat.t#187 and split.t#{13,14}
270 * (as of patchlevel 7877) will fail. Then again,
271 * this code seems to be necessary or otherwise
272 * building DynaLoader will fail:
273 * "Error: '*' not in typemap in DynaLoader.xs, line 164"
275 for (i = *PL_reglastparen + 1; i <= rex->nparens; i++) {
277 PL_regstartp[i] = -1;
284 #define regcpblow(cp) LEAVE_SCOPE(cp) /* Ignores regcppush()ed data. */
287 * pregexec and friends
290 #ifndef PERL_IN_XSUB_RE
292 - pregexec - match a regexp against a string
295 Perl_pregexec(pTHX_ register regexp *prog, char *stringarg, register char *strend,
296 char *strbeg, I32 minend, SV *screamer, U32 nosave)
297 /* strend: pointer to null at end of string */
298 /* strbeg: real beginning of string */
299 /* minend: end of match must be >=minend after stringarg. */
300 /* nosave: For optimizations. */
303 regexec_flags(prog, stringarg, strend, strbeg, minend, screamer, NULL,
304 nosave ? 0 : REXEC_COPY_STR);
309 * Need to implement the following flags for reg_anch:
311 * USE_INTUIT_NOML - Useful to call re_intuit_start() first
313 * INTUIT_AUTORITATIVE_NOML - Can trust a positive answer
314 * INTUIT_AUTORITATIVE_ML
315 * INTUIT_ONCE_NOML - Intuit can match in one location only.
318 * Another flag for this function: SECOND_TIME (so that float substrs
319 * with giant delta may be not rechecked).
322 /* Assumptions: if ANCH_GPOS, then strpos is anchored. XXXX Check GPOS logic */
324 /* If SCREAM, then SvPVX_const(sv) should be compatible with strpos and strend.
325 Otherwise, only SvCUR(sv) is used to get strbeg. */
327 /* XXXX We assume that strpos is strbeg unless sv. */
329 /* XXXX Some places assume that there is a fixed substring.
330 An update may be needed if optimizer marks as "INTUITable"
331 RExen without fixed substrings. Similarly, it is assumed that
332 lengths of all the strings are no more than minlen, thus they
333 cannot come from lookahead.
334 (Or minlen should take into account lookahead.)
335 NOTE: Some of this comment is not correct. minlen does now take account
336 of lookahead/behind. Further research is required. -- demerphq
340 /* A failure to find a constant substring means that there is no need to make
341 an expensive call to REx engine, thus we celebrate a failure. Similarly,
342 finding a substring too deep into the string means that less calls to
343 regtry() should be needed.
345 REx compiler's optimizer found 4 possible hints:
346 a) Anchored substring;
348 c) Whether we are anchored (beginning-of-line or \G);
349 d) First node (of those at offset 0) which may distingush positions;
350 We use a)b)d) and multiline-part of c), and try to find a position in the
351 string which does not contradict any of them.
354 /* Most of decisions we do here should have been done at compile time.
355 The nodes of the REx which we used for the search should have been
356 deleted from the finite automaton. */
359 Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
360 char *strend, U32 flags, re_scream_pos_data *data)
363 register I32 start_shift = 0;
364 /* Should be nonnegative! */
365 register I32 end_shift = 0;
370 const bool do_utf8 = (sv && SvUTF8(sv)) ? 1 : 0; /* if no sv we have to assume bytes */
372 register char *other_last = NULL; /* other substr checked before this */
373 char *check_at = NULL; /* check substr found at this pos */
374 const I32 multiline = prog->reganch & PMf_MULTILINE;
376 const char * const i_strpos = strpos;
379 GET_RE_DEBUG_FLAGS_DECL;
381 RX_MATCH_UTF8_set(prog,do_utf8);
383 if (prog->reganch & ROPT_UTF8) {
384 PL_reg_flags |= RF_utf8;
387 debug_start_match(prog, do_utf8, strpos, strend,
388 sv ? "Guessing start of match in sv for"
389 : "Guessing start of match in string for");
392 /* CHR_DIST() would be more correct here but it makes things slow. */
393 if (prog->minlen > strend - strpos) {
394 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
395 "String too short... [re_intuit_start]\n"));
399 strbeg = (sv && SvPOK(sv)) ? strend - SvCUR(sv) : strpos;
402 if (!prog->check_utf8 && prog->check_substr)
403 to_utf8_substr(prog);
404 check = prog->check_utf8;
406 if (!prog->check_substr && prog->check_utf8)
407 to_byte_substr(prog);
408 check = prog->check_substr;
410 if (check == &PL_sv_undef) {
411 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
412 "Non-utf8 string cannot match utf8 check string\n"));
415 if (prog->reganch & ROPT_ANCH) { /* Match at beg-of-str or after \n */
416 ml_anch = !( (prog->reganch & ROPT_ANCH_SINGLE)
417 || ( (prog->reganch & ROPT_ANCH_BOL)
418 && !multiline ) ); /* Check after \n? */
421 if ( !(prog->reganch & (ROPT_ANCH_GPOS /* Checked by the caller */
422 | ROPT_IMPLICIT)) /* not a real BOL */
423 /* SvCUR is not set on references: SvRV and SvPVX_const overlap */
425 && (strpos != strbeg)) {
426 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Not at start...\n"));
429 if (prog->check_offset_min == prog->check_offset_max &&
430 !(prog->reganch & ROPT_CANY_SEEN)) {
431 /* Substring at constant offset from beg-of-str... */
434 s = HOP3c(strpos, prog->check_offset_min, strend);
437 slen = SvCUR(check); /* >= 1 */
439 if ( strend - s > slen || strend - s < slen - 1
440 || (strend - s == slen && strend[-1] != '\n')) {
441 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "String too long...\n"));
444 /* Now should match s[0..slen-2] */
446 if (slen && (*SvPVX_const(check) != *s
448 && memNE(SvPVX_const(check), s, slen)))) {
450 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "String not equal...\n"));
454 else if (*SvPVX_const(check) != *s
455 || ((slen = SvCUR(check)) > 1
456 && memNE(SvPVX_const(check), s, slen)))
459 goto success_at_start;
462 /* Match is anchored, but substr is not anchored wrt beg-of-str. */
464 start_shift = prog->check_offset_min; /* okay to underestimate on CC */
465 end_shift = prog->check_end_shift;
468 const I32 end = prog->check_offset_max + CHR_SVLEN(check)
469 - (SvTAIL(check) != 0);
470 const I32 eshift = CHR_DIST((U8*)strend, (U8*)s) - end;
472 if (end_shift < eshift)
476 else { /* Can match at random position */
479 start_shift = prog->check_offset_min; /* okay to underestimate on CC */
480 end_shift = prog->check_end_shift;
482 /* end shift should be non negative here */
485 #ifdef DEBUGGING /* 7/99: reports of failure (with the older version) */
487 Perl_croak(aTHX_ "panic: end_shift: %"IVdf" pattern:\n%s\n ",
488 (IV)end_shift, prog->precomp);
492 /* Find a possible match in the region s..strend by looking for
493 the "check" substring in the region corrected by start/end_shift. */
496 I32 srch_start_shift = start_shift;
497 I32 srch_end_shift = end_shift;
498 if (srch_start_shift < 0 && strbeg - s > srch_start_shift) {
499 srch_end_shift -= ((strbeg - s) - srch_start_shift);
500 srch_start_shift = strbeg - s;
502 DEBUG_OPTIMISE_MORE_r({
503 PerlIO_printf(Perl_debug_log, "Check offset min: %"IVdf" Start shift: %"IVdf" End shift %"IVdf" Real End Shift: %"IVdf"\n",
504 (IV)prog->check_offset_min,
505 (IV)srch_start_shift,
507 (IV)prog->check_end_shift);
510 if (flags & REXEC_SCREAM) {
511 I32 p = -1; /* Internal iterator of scream. */
512 I32 * const pp = data ? data->scream_pos : &p;
514 if (PL_screamfirst[BmRARE(check)] >= 0
515 || ( BmRARE(check) == '\n'
516 && (BmPREVIOUS(check) == SvCUR(check) - 1)
518 s = screaminstr(sv, check,
519 srch_start_shift + (s - strbeg), srch_end_shift, pp, 0);
522 /* we may be pointing at the wrong string */
523 if (s && RX_MATCH_COPIED(prog))
524 s = strbeg + (s - SvPVX_const(sv));
526 *data->scream_olds = s;
531 if (prog->reganch & ROPT_CANY_SEEN) {
532 start_point= (U8*)(s + srch_start_shift);
533 end_point= (U8*)(strend - srch_end_shift);
535 start_point= HOP3(s, srch_start_shift, srch_start_shift < 0 ? strbeg : strend);
536 end_point= HOP3(strend, -srch_end_shift, strbeg);
538 DEBUG_OPTIMISE_MORE_r({
539 PerlIO_printf(Perl_debug_log, "fbm_instr len=%d str=<%.*s>\n",
540 (int)(end_point - start_point),
541 (int)(end_point - start_point) > 20 ? 20 : (int)(end_point - start_point),
545 s = fbm_instr( start_point, end_point,
546 check, multiline ? FBMrf_MULTILINE : 0);
549 /* Update the count-of-usability, remove useless subpatterns,
553 RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0),
554 SvPVX_const(check), RE_SV_DUMPLEN(check), 30);
555 PerlIO_printf(Perl_debug_log, "%s %s substr %s%s%s",
556 (s ? "Found" : "Did not find"),
557 (check == (do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)
558 ? "anchored" : "floating"),
561 (s ? " at offset " : "...\n") );
566 /* Finish the diagnostic message */
567 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%ld...\n", (long)(s - i_strpos)) );
569 /* XXX dmq: first branch is for positive lookbehind...
570 Our check string is offset from the beginning of the pattern.
571 So we need to do any stclass tests offset forward from that
580 /* Got a candidate. Check MBOL anchoring, and the *other* substr.
581 Start with the other substr.
582 XXXX no SCREAM optimization yet - and a very coarse implementation
583 XXXX /ttx+/ results in anchored="ttx", floating="x". floating will
584 *always* match. Probably should be marked during compile...
585 Probably it is right to do no SCREAM here...
588 if (do_utf8 ? (prog->float_utf8 && prog->anchored_utf8)
589 : (prog->float_substr && prog->anchored_substr))
591 /* Take into account the "other" substring. */
592 /* XXXX May be hopelessly wrong for UTF... */
595 if (check == (do_utf8 ? prog->float_utf8 : prog->float_substr)) {
598 char * const last = HOP3c(s, -start_shift, strbeg);
600 char * const saved_s = s;
603 t = s - prog->check_offset_max;
604 if (s - strpos > prog->check_offset_max /* signed-corrected t > strpos */
606 || ((t = (char*)reghopmaybe3((U8*)s, -(prog->check_offset_max), (U8*)strpos))
611 t = HOP3c(t, prog->anchored_offset, strend);
612 if (t < other_last) /* These positions already checked */
614 last2 = last1 = HOP3c(strend, -prog->minlen, strbeg);
617 /* XXXX It is not documented what units *_offsets are in.
618 We assume bytes, but this is clearly wrong.
619 Meaning this code needs to be carefully reviewed for errors.
623 /* On end-of-str: see comment below. */
624 must = do_utf8 ? prog->anchored_utf8 : prog->anchored_substr;
625 if (must == &PL_sv_undef) {
627 DEBUG_r(must = prog->anchored_utf8); /* for debug */
632 HOP3(HOP3(last1, prog->anchored_offset, strend)
633 + SvCUR(must), -(SvTAIL(must)!=0), strbeg),
635 multiline ? FBMrf_MULTILINE : 0
638 RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0),
639 SvPVX_const(must), RE_SV_DUMPLEN(must), 30);
640 PerlIO_printf(Perl_debug_log, "%s anchored substr %s%s",
641 (s ? "Found" : "Contradicts"),
642 quoted, RE_SV_TAIL(must));
647 if (last1 >= last2) {
648 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
649 ", giving up...\n"));
652 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
653 ", trying floating at offset %ld...\n",
654 (long)(HOP3c(saved_s, 1, strend) - i_strpos)));
655 other_last = HOP3c(last1, prog->anchored_offset+1, strend);
656 s = HOP3c(last, 1, strend);
660 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, " at offset %ld...\n",
661 (long)(s - i_strpos)));
662 t = HOP3c(s, -prog->anchored_offset, strbeg);
663 other_last = HOP3c(s, 1, strend);
671 else { /* Take into account the floating substring. */
673 char * const saved_s = s;
676 t = HOP3c(s, -start_shift, strbeg);
678 HOP3c(strend, -prog->minlen + prog->float_min_offset, strbeg);
679 if (CHR_DIST((U8*)last, (U8*)t) > prog->float_max_offset)
680 last = HOP3c(t, prog->float_max_offset, strend);
681 s = HOP3c(t, prog->float_min_offset, strend);
684 /* XXXX It is not documented what units *_offsets are in. Assume bytes. */
685 must = do_utf8 ? prog->float_utf8 : prog->float_substr;
686 /* fbm_instr() takes into account exact value of end-of-str
687 if the check is SvTAIL(ed). Since false positives are OK,
688 and end-of-str is not later than strend we are OK. */
689 if (must == &PL_sv_undef) {
691 DEBUG_r(must = prog->float_utf8); /* for debug message */
694 s = fbm_instr((unsigned char*)s,
695 (unsigned char*)last + SvCUR(must)
697 must, multiline ? FBMrf_MULTILINE : 0);
699 RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0),
700 SvPVX_const(must), RE_SV_DUMPLEN(must), 30);
701 PerlIO_printf(Perl_debug_log, "%s floating substr %s%s",
702 (s ? "Found" : "Contradicts"),
703 quoted, RE_SV_TAIL(must));
707 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
708 ", giving up...\n"));
711 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
712 ", trying anchored starting at offset %ld...\n",
713 (long)(saved_s + 1 - i_strpos)));
715 s = HOP3c(t, 1, strend);
719 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, " at offset %ld...\n",
720 (long)(s - i_strpos)));
721 other_last = s; /* Fix this later. --Hugo */
731 t= (char*)HOP3( s, -prog->check_offset_max, (prog->check_offset_max<0) ? strend : strpos);
733 DEBUG_OPTIMISE_MORE_r(
734 PerlIO_printf(Perl_debug_log,
735 "Check offset min:%"IVdf" max:%"IVdf" S:%"IVdf" t:%"IVdf" D:%"IVdf" end:%"IVdf"\n",
736 (IV)prog->check_offset_min,
737 (IV)prog->check_offset_max,
745 if (s - strpos > prog->check_offset_max /* signed-corrected t > strpos */
747 || ((t = (char*)reghopmaybe3((U8*)s, -prog->check_offset_max, (U8*) ((prog->check_offset_max<0) ? strend : strpos)))
750 /* Fixed substring is found far enough so that the match
751 cannot start at strpos. */
753 if (ml_anch && t[-1] != '\n') {
754 /* Eventually fbm_*() should handle this, but often
755 anchored_offset is not 0, so this check will not be wasted. */
756 /* XXXX In the code below we prefer to look for "^" even in
757 presence of anchored substrings. And we search even
758 beyond the found float position. These pessimizations
759 are historical artefacts only. */
761 while (t < strend - prog->minlen) {
763 if (t < check_at - prog->check_offset_min) {
764 if (do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) {
765 /* Since we moved from the found position,
766 we definitely contradict the found anchored
767 substr. Due to the above check we do not
768 contradict "check" substr.
769 Thus we can arrive here only if check substr
770 is float. Redo checking for "other"=="fixed".
773 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m at offset %ld, rescanning for anchored from offset %ld...\n",
774 PL_colors[0], PL_colors[1], (long)(strpos - i_strpos), (long)(strpos - i_strpos + prog->anchored_offset)));
775 goto do_other_anchored;
777 /* We don't contradict the found floating substring. */
778 /* XXXX Why not check for STCLASS? */
780 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m at offset %ld...\n",
781 PL_colors[0], PL_colors[1], (long)(s - i_strpos)));
784 /* Position contradicts check-string */
785 /* XXXX probably better to look for check-string
786 than for "\n", so one should lower the limit for t? */
787 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m, restarting lookup for check-string at offset %ld...\n",
788 PL_colors[0], PL_colors[1], (long)(t + 1 - i_strpos)));
789 other_last = strpos = s = t + 1;
794 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Did not find /%s^%s/m...\n",
795 PL_colors[0], PL_colors[1]));
799 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Starting position does not contradict /%s^%s/m...\n",
800 PL_colors[0], PL_colors[1]));
804 ++BmUSEFUL(do_utf8 ? prog->check_utf8 : prog->check_substr); /* hooray/5 */
807 /* The found string does not prohibit matching at strpos,
808 - no optimization of calling REx engine can be performed,
809 unless it was an MBOL and we are not after MBOL,
810 or a future STCLASS check will fail this. */
812 /* Even in this situation we may use MBOL flag if strpos is offset
813 wrt the start of the string. */
814 if (ml_anch && sv && !SvROK(sv) /* See prev comment on SvROK */
815 && (strpos != strbeg) && strpos[-1] != '\n'
816 /* May be due to an implicit anchor of m{.*foo} */
817 && !(prog->reganch & ROPT_IMPLICIT))
822 DEBUG_EXECUTE_r( if (ml_anch)
823 PerlIO_printf(Perl_debug_log, "Position at offset %ld does not contradict /%s^%s/m...\n",
824 (long)(strpos - i_strpos), PL_colors[0], PL_colors[1]);
827 if (!(prog->reganch & ROPT_NAUGHTY) /* XXXX If strpos moved? */
829 prog->check_utf8 /* Could be deleted already */
830 && --BmUSEFUL(prog->check_utf8) < 0
831 && (prog->check_utf8 == prog->float_utf8)
833 prog->check_substr /* Could be deleted already */
834 && --BmUSEFUL(prog->check_substr) < 0
835 && (prog->check_substr == prog->float_substr)
838 /* If flags & SOMETHING - do not do it many times on the same match */
839 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "... Disabling check substring...\n"));
840 SvREFCNT_dec(do_utf8 ? prog->check_utf8 : prog->check_substr);
841 if (do_utf8 ? prog->check_substr : prog->check_utf8)
842 SvREFCNT_dec(do_utf8 ? prog->check_substr : prog->check_utf8);
843 prog->check_substr = prog->check_utf8 = NULL; /* disable */
844 prog->float_substr = prog->float_utf8 = NULL; /* clear */
845 check = NULL; /* abort */
847 /* XXXX This is a remnant of the old implementation. It
848 looks wasteful, since now INTUIT can use many
850 prog->reganch &= ~RE_USE_INTUIT;
857 /* XXXX BmUSEFUL already changed, maybe multiple change is meaningful... */
858 /* trie stclasses are too expensive to use here, we are better off to
859 leave it to regmatch itself */
860 if (prog->regstclass && PL_regkind[OP(prog->regstclass)]!=TRIE) {
861 /* minlen == 0 is possible if regstclass is \b or \B,
862 and the fixed substr is ''$.
863 Since minlen is already taken into account, s+1 is before strend;
864 accidentally, minlen >= 1 guaranties no false positives at s + 1
865 even for \b or \B. But (minlen? 1 : 0) below assumes that
866 regstclass does not come from lookahead... */
867 /* If regstclass takes bytelength more than 1: If charlength==1, OK.
868 This leaves EXACTF only, which is dealt with in find_byclass(). */
869 const U8* const str = (U8*)STRING(prog->regstclass);
870 const int cl_l = (PL_regkind[OP(prog->regstclass)] == EXACT
871 ? CHR_DIST(str+STR_LEN(prog->regstclass), str)
874 if (prog->anchored_substr || prog->anchored_utf8 || ml_anch)
875 endpos= HOP3c(s, (prog->minlen ? cl_l : 0), strend);
876 else if (prog->float_substr || prog->float_utf8)
877 endpos= HOP3c(HOP3c(check_at, -start_shift, strbeg), cl_l, strend);
881 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "start_shift: %"IVdf" check_at: %d s: %d endpos: %d\n",
882 (IV)start_shift, check_at - strbeg, s - strbeg, endpos - strbeg));
885 s = find_byclass(prog, prog->regstclass, s, endpos, NULL);
888 const char *what = NULL;
890 if (endpos == strend) {
891 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
892 "Could not match STCLASS...\n") );
895 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
896 "This position contradicts STCLASS...\n") );
897 if ((prog->reganch & ROPT_ANCH) && !ml_anch)
899 /* Contradict one of substrings */
900 if (prog->anchored_substr || prog->anchored_utf8) {
901 if ((do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) == check) {
902 DEBUG_EXECUTE_r( what = "anchored" );
904 s = HOP3c(t, 1, strend);
905 if (s + start_shift + end_shift > strend) {
906 /* XXXX Should be taken into account earlier? */
907 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
908 "Could not match STCLASS...\n") );
913 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
914 "Looking for %s substr starting at offset %ld...\n",
915 what, (long)(s + start_shift - i_strpos)) );
918 /* Have both, check_string is floating */
919 if (t + start_shift >= check_at) /* Contradicts floating=check */
920 goto retry_floating_check;
921 /* Recheck anchored substring, but not floating... */
925 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
926 "Looking for anchored substr starting at offset %ld...\n",
927 (long)(other_last - i_strpos)) );
928 goto do_other_anchored;
930 /* Another way we could have checked stclass at the
931 current position only: */
936 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
937 "Looking for /%s^%s/m starting at offset %ld...\n",
938 PL_colors[0], PL_colors[1], (long)(t - i_strpos)) );
941 if (!(do_utf8 ? prog->float_utf8 : prog->float_substr)) /* Could have been deleted */
943 /* Check is floating subtring. */
944 retry_floating_check:
945 t = check_at - start_shift;
946 DEBUG_EXECUTE_r( what = "floating" );
947 goto hop_and_restart;
950 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
951 "By STCLASS: moving %ld --> %ld\n",
952 (long)(t - i_strpos), (long)(s - i_strpos))
956 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
957 "Does not contradict STCLASS...\n");
962 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%s%s:%s match at offset %ld\n",
963 PL_colors[4], (check ? "Guessed" : "Giving up"),
964 PL_colors[5], (long)(s - i_strpos)) );
967 fail_finish: /* Substring not found */
968 if (prog->check_substr || prog->check_utf8) /* could be removed already */
969 BmUSEFUL(do_utf8 ? prog->check_utf8 : prog->check_substr) += 5; /* hooray */
971 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch rejected by optimizer%s\n",
972 PL_colors[4], PL_colors[5]));
978 #define REXEC_TRIE_READ_CHAR(trie_type, trie, uc, uscan, len, uvc, charid, \
979 foldlen, foldbuf, uniflags) STMT_START { \
980 switch (trie_type) { \
981 case trie_utf8_fold: \
983 uvc = utf8n_to_uvuni( uscan, UTF8_MAXLEN, &len, uniflags ); \
988 uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags ); \
989 uvc = to_uni_fold( uvc, foldbuf, &foldlen ); \
990 foldlen -= UNISKIP( uvc ); \
991 uscan = foldbuf + UNISKIP( uvc ); \
995 uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags ); \
1003 charid = trie->charmap[ uvc ]; \
1007 if (trie->widecharmap) { \
1008 SV** const svpp = hv_fetch(trie->widecharmap, \
1009 (char*)&uvc, sizeof(UV), 0); \
1011 charid = (U16)SvIV(*svpp); \
1016 #define REXEC_FBC_EXACTISH_CHECK(CoNd) \
1019 ibcmp_utf8(s, NULL, 0, do_utf8, \
1020 m, NULL, ln, (bool)UTF)) \
1021 && (!reginfo || regtry(reginfo, &s)) ) \
1024 U8 foldbuf[UTF8_MAXBYTES_CASE+1]; \
1025 uvchr_to_utf8(tmpbuf, c); \
1026 f = to_utf8_fold(tmpbuf, foldbuf, &foldlen); \
1028 && (f == c1 || f == c2) \
1029 && (ln == foldlen || \
1030 !ibcmp_utf8((char *) foldbuf, \
1031 NULL, foldlen, do_utf8, \
1033 NULL, ln, (bool)UTF)) \
1034 && (!reginfo || regtry(reginfo, &s)) ) \
1039 #define REXEC_FBC_EXACTISH_SCAN(CoNd) \
1043 && (ln == 1 || !(OP(c) == EXACTF \
1045 : ibcmp_locale(s, m, ln))) \
1046 && (!reginfo || regtry(reginfo, &s)) ) \
1052 #define REXEC_FBC_UTF8_SCAN(CoDe) \
1054 while (s + (uskip = UTF8SKIP(s)) <= strend) { \
1060 #define REXEC_FBC_SCAN(CoDe) \
1062 while (s < strend) { \
1068 #define REXEC_FBC_UTF8_CLASS_SCAN(CoNd) \
1069 REXEC_FBC_UTF8_SCAN( \
1071 if (tmp && (!reginfo || regtry(reginfo, &s))) \
1080 #define REXEC_FBC_CLASS_SCAN(CoNd) \
1083 if (tmp && (!reginfo || regtry(reginfo, &s))) \
1092 #define REXEC_FBC_TRYIT \
1093 if ((!reginfo || regtry(reginfo, &s))) \
1096 #define REXEC_FBC_CSCAN_PRELOAD(UtFpReLoAd,CoNdUtF8,CoNd) \
1099 REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8); \
1102 REXEC_FBC_CLASS_SCAN(CoNd); \
1106 #define REXEC_FBC_CSCAN_TAINT(CoNdUtF8,CoNd) \
1107 PL_reg_flags |= RF_tainted; \
1109 REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8); \
1112 REXEC_FBC_CLASS_SCAN(CoNd); \
1116 #define DUMP_EXEC_POS(li,s,doutf8) \
1117 dump_exec_pos(li,s,(PL_regeol),(PL_bostr),(PL_reg_starttry),doutf8)
1119 /* We know what class REx starts with. Try to find this position... */
1120 /* if reginfo is NULL, its a dryrun */
1121 /* annoyingly all the vars in this routine have different names from their counterparts
1122 in regmatch. /grrr */
1125 S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
1126 const char *strend, regmatch_info *reginfo)
1129 const I32 doevery = (prog->reganch & ROPT_SKIP) == 0;
1133 register STRLEN uskip;
1137 register I32 tmp = 1; /* Scratch variable? */
1138 register const bool do_utf8 = PL_reg_match_utf8;
1140 /* We know what class it must start with. */
1144 REXEC_FBC_UTF8_CLASS_SCAN((ANYOF_FLAGS(c) & ANYOF_UNICODE) ||
1145 !UTF8_IS_INVARIANT((U8)s[0]) ?
1146 reginclass(prog, c, (U8*)s, 0, do_utf8) :
1147 REGINCLASS(prog, c, (U8*)s));
1150 while (s < strend) {
1153 if (REGINCLASS(prog, c, (U8*)s) ||
1154 (ANYOF_FOLD_SHARP_S(c, s, strend) &&
1155 /* The assignment of 2 is intentional:
1156 * for the folded sharp s, the skip is 2. */
1157 (skip = SHARP_S_SKIP))) {
1158 if (tmp && (!reginfo || regtry(reginfo, &s)))
1171 if (tmp && (!reginfo || regtry(reginfo, &s)))
1179 ln = STR_LEN(c); /* length to match in octets/bytes */
1180 lnc = (I32) ln; /* length to match in characters */
1182 STRLEN ulen1, ulen2;
1184 U8 tmpbuf1[UTF8_MAXBYTES_CASE+1];
1185 U8 tmpbuf2[UTF8_MAXBYTES_CASE+1];
1186 const U32 uniflags = UTF8_ALLOW_DEFAULT;
1188 to_utf8_lower((U8*)m, tmpbuf1, &ulen1);
1189 to_utf8_upper((U8*)m, tmpbuf2, &ulen2);
1191 c1 = utf8n_to_uvchr(tmpbuf1, UTF8_MAXBYTES_CASE,
1193 c2 = utf8n_to_uvchr(tmpbuf2, UTF8_MAXBYTES_CASE,
1196 while (sm < ((U8 *) m + ln)) {
1211 c2 = PL_fold_locale[c1];
1213 e = HOP3c(strend, -((I32)lnc), s);
1215 if (!reginfo && e < s)
1216 e = s; /* Due to minlen logic of intuit() */
1218 /* The idea in the EXACTF* cases is to first find the
1219 * first character of the EXACTF* node and then, if
1220 * necessary, case-insensitively compare the full
1221 * text of the node. The c1 and c2 are the first
1222 * characters (though in Unicode it gets a bit
1223 * more complicated because there are more cases
1224 * than just upper and lower: one needs to use
1225 * the so-called folding case for case-insensitive
1226 * matching (called "loose matching" in Unicode).
1227 * ibcmp_utf8() will do just that. */
1231 U8 tmpbuf [UTF8_MAXBYTES+1];
1232 STRLEN len, foldlen;
1233 const U32 uniflags = UTF8_ALLOW_DEFAULT;
1235 /* Upper and lower of 1st char are equal -
1236 * probably not a "letter". */
1238 c = utf8n_to_uvchr((U8*)s, UTF8_MAXBYTES, &len,
1240 REXEC_FBC_EXACTISH_CHECK(c == c1);
1245 c = utf8n_to_uvchr((U8*)s, UTF8_MAXBYTES, &len,
1248 /* Handle some of the three Greek sigmas cases.
1249 * Note that not all the possible combinations
1250 * are handled here: some of them are handled
1251 * by the standard folding rules, and some of
1252 * them (the character class or ANYOF cases)
1253 * are handled during compiletime in
1254 * regexec.c:S_regclass(). */
1255 if (c == (UV)UNICODE_GREEK_CAPITAL_LETTER_SIGMA ||
1256 c == (UV)UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA)
1257 c = (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA;
1259 REXEC_FBC_EXACTISH_CHECK(c == c1 || c == c2);
1265 REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1);
1267 REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1 || *(U8*)s == c2);
1271 PL_reg_flags |= RF_tainted;
1278 U8 * const r = reghop3((U8*)s, -1, (U8*)PL_bostr);
1279 tmp = utf8n_to_uvchr(r, UTF8SKIP(r), 0, UTF8_ALLOW_DEFAULT);
1281 tmp = ((OP(c) == BOUND ?
1282 isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0);
1283 LOAD_UTF8_CHARCLASS_ALNUM();
1284 REXEC_FBC_UTF8_SCAN(
1285 if (tmp == !(OP(c) == BOUND ?
1286 (bool)swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) :
1287 isALNUM_LC_utf8((U8*)s)))
1295 tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n';
1296 tmp = ((OP(c) == BOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0);
1299 !(OP(c) == BOUND ? isALNUM(*s) : isALNUM_LC(*s))) {
1305 if ((!prog->minlen && tmp) && (!reginfo || regtry(reginfo, &s)))
1309 PL_reg_flags |= RF_tainted;
1316 U8 * const r = reghop3((U8*)s, -1, (U8*)PL_bostr);
1317 tmp = utf8n_to_uvchr(r, UTF8SKIP(r), 0, UTF8_ALLOW_DEFAULT);
1319 tmp = ((OP(c) == NBOUND ?
1320 isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0);
1321 LOAD_UTF8_CHARCLASS_ALNUM();
1322 REXEC_FBC_UTF8_SCAN(
1323 if (tmp == !(OP(c) == NBOUND ?
1324 (bool)swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) :
1325 isALNUM_LC_utf8((U8*)s)))
1327 else REXEC_FBC_TRYIT;
1331 tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n';
1332 tmp = ((OP(c) == NBOUND ?
1333 isALNUM(tmp) : isALNUM_LC(tmp)) != 0);
1336 !(OP(c) == NBOUND ? isALNUM(*s) : isALNUM_LC(*s)))
1338 else REXEC_FBC_TRYIT;
1341 if ((!prog->minlen && !tmp) && (!reginfo || regtry(reginfo, &s)))
1345 REXEC_FBC_CSCAN_PRELOAD(
1346 LOAD_UTF8_CHARCLASS_ALNUM(),
1347 swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8),
1351 REXEC_FBC_CSCAN_TAINT(
1352 isALNUM_LC_utf8((U8*)s),
1356 REXEC_FBC_CSCAN_PRELOAD(
1357 LOAD_UTF8_CHARCLASS_ALNUM(),
1358 !swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8),
1362 REXEC_FBC_CSCAN_TAINT(
1363 !isALNUM_LC_utf8((U8*)s),
1367 REXEC_FBC_CSCAN_PRELOAD(
1368 LOAD_UTF8_CHARCLASS_SPACE(),
1369 *s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8),
1373 REXEC_FBC_CSCAN_TAINT(
1374 *s == ' ' || isSPACE_LC_utf8((U8*)s),
1378 REXEC_FBC_CSCAN_PRELOAD(
1379 LOAD_UTF8_CHARCLASS_SPACE(),
1380 !(*s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8)),
1384 REXEC_FBC_CSCAN_TAINT(
1385 !(*s == ' ' || isSPACE_LC_utf8((U8*)s)),
1389 REXEC_FBC_CSCAN_PRELOAD(
1390 LOAD_UTF8_CHARCLASS_DIGIT(),
1391 swash_fetch(PL_utf8_digit,(U8*)s, do_utf8),
1395 REXEC_FBC_CSCAN_TAINT(
1396 isDIGIT_LC_utf8((U8*)s),
1400 REXEC_FBC_CSCAN_PRELOAD(
1401 LOAD_UTF8_CHARCLASS_DIGIT(),
1402 !swash_fetch(PL_utf8_digit,(U8*)s, do_utf8),
1406 REXEC_FBC_CSCAN_TAINT(
1407 !isDIGIT_LC_utf8((U8*)s),
1413 const enum { trie_plain, trie_utf8, trie_utf8_fold }
1414 trie_type = do_utf8 ?
1415 (c->flags == EXACT ? trie_utf8 : trie_utf8_fold)
1417 /* what trie are we using right now */
1419 = (reg_ac_data*)prog->data->data[ ARG( c ) ];
1420 reg_trie_data *trie=aho->trie;
1422 const char *last_start = strend - trie->minlen;
1424 const char *real_start = s;
1426 STRLEN maxlen = trie->maxlen;
1428 U8 **points; /* map of where we were in the input string
1429 when reading a given char. For ASCII this
1430 is unnecessary overhead as the relationship
1431 is always 1:1, but for unicode, especially
1432 case folded unicode this is not true. */
1433 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1437 GET_RE_DEBUG_FLAGS_DECL;
1439 /* We can't just allocate points here. We need to wrap it in
1440 * an SV so it gets freed properly if there is a croak while
1441 * running the match */
1444 sv_points=newSV(maxlen * sizeof(U8 *));
1445 SvCUR_set(sv_points,
1446 maxlen * sizeof(U8 *));
1447 SvPOK_on(sv_points);
1448 sv_2mortal(sv_points);
1449 points=(U8**)SvPV_nolen(sv_points );
1450 if ( trie_type != trie_utf8_fold
1451 && (trie->bitmap || OP(c)==AHOCORASICKC) )
1454 bitmap=(U8*)trie->bitmap;
1456 bitmap=(U8*)ANYOF_BITMAP(c);
1458 /* this is the Aho-Corasick algorithm modified a touch
1459 to include special handling for long "unknown char"
1460 sequences. The basic idea being that we use AC as long
1461 as we are dealing with a possible matching char, when
1462 we encounter an unknown char (and we have not encountered
1463 an accepting state) we scan forward until we find a legal
1465 AC matching is basically that of trie matching, except
1466 that when we encounter a failing transition, we fall back
1467 to the current states "fail state", and try the current char
1468 again, a process we repeat until we reach the root state,
1469 state 1, or a legal transition. If we fail on the root state
1470 then we can either terminate if we have reached an accepting
1471 state previously, or restart the entire process from the beginning
1475 while (s <= last_start) {
1476 const U32 uniflags = UTF8_ALLOW_DEFAULT;
1484 U8 *uscan = (U8*)NULL;
1485 U8 *leftmost = NULL;
1487 U32 accepted_word= 0;
1491 while ( state && uc <= (U8*)strend ) {
1493 U32 word = aho->states[ state ].wordnum;
1497 DEBUG_TRIE_EXECUTE_r(
1498 if ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) {
1499 dump_exec_pos( (char *)uc, c, strend, real_start,
1500 (char *)uc, do_utf8 );
1501 PerlIO_printf( Perl_debug_log,
1502 " Scanning for legal start char...\n");
1505 while ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) {
1510 if (uc >(U8*)last_start) break;
1514 U8 *lpos= points[ (pointpos - trie->wordlen[word-1] ) % maxlen ];
1515 if (!leftmost || lpos < leftmost) {
1516 DEBUG_r(accepted_word=word);
1522 points[pointpos++ % maxlen]= uc;
1523 REXEC_TRIE_READ_CHAR(trie_type, trie, uc, uscan, len,
1524 uvc, charid, foldlen, foldbuf, uniflags);
1525 DEBUG_TRIE_EXECUTE_r({
1526 dump_exec_pos( (char *)uc, c, strend, real_start,
1528 PerlIO_printf(Perl_debug_log,
1529 " Charid:%3u CP:%4"UVxf" ",
1535 word = aho->states[ state ].wordnum;
1537 base = aho->states[ state ].trans.base;
1539 DEBUG_TRIE_EXECUTE_r({
1541 dump_exec_pos( (char *)uc, c, strend, real_start,
1543 PerlIO_printf( Perl_debug_log,
1544 "%sState: %4"UVxf", word=%"UVxf,
1545 failed ? " Fail transition to " : "",
1546 (UV)state, (UV)word);
1551 (base + charid > trie->uniquecharcount )
1552 && (base + charid - 1 - trie->uniquecharcount
1554 && trie->trans[base + charid - 1 -
1555 trie->uniquecharcount].check == state
1556 && (tmp=trie->trans[base + charid - 1 -
1557 trie->uniquecharcount ].next))
1559 DEBUG_TRIE_EXECUTE_r(
1560 PerlIO_printf( Perl_debug_log," - legal\n"));
1565 DEBUG_TRIE_EXECUTE_r(
1566 PerlIO_printf( Perl_debug_log," - fail\n"));
1568 state = aho->fail[state];
1572 /* we must be accepting here */
1573 DEBUG_TRIE_EXECUTE_r(
1574 PerlIO_printf( Perl_debug_log," - accepting\n"));
1583 if (!state) state = 1;
1586 if ( aho->states[ state ].wordnum ) {
1587 U8 *lpos = points[ (pointpos - trie->wordlen[aho->states[ state ].wordnum-1]) % maxlen ];
1588 if (!leftmost || lpos < leftmost) {
1589 DEBUG_r(accepted_word=aho->states[ state ].wordnum);
1594 s = (char*)leftmost;
1595 DEBUG_TRIE_EXECUTE_r({
1597 Perl_debug_log,"Matches word #%"UVxf" at position %d. Trying full pattern...\n",
1598 (UV)accepted_word, s - real_start
1601 if (!reginfo || regtry(reginfo, &s)) {
1607 DEBUG_TRIE_EXECUTE_r({
1608 PerlIO_printf( Perl_debug_log,"Pattern failed. Looking for new start point...\n");
1611 DEBUG_TRIE_EXECUTE_r(
1612 PerlIO_printf( Perl_debug_log,"No match.\n"));
1621 Perl_croak(aTHX_ "panic: unknown regstclass %d", (int)OP(c));
1630 - regexec_flags - match a regexp against a string
1633 Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *strend,
1634 char *strbeg, I32 minend, SV *sv, void *data, U32 flags)
1635 /* strend: pointer to null at end of string */
1636 /* strbeg: real beginning of string */
1637 /* minend: end of match must be >=minend after stringarg. */
1638 /* data: May be used for some additional optimizations. */
1639 /* nosave: For optimizations. */
1642 /*register*/ char *s;
1643 register regnode *c;
1644 /*register*/ char *startpos = stringarg;
1645 I32 minlen; /* must match at least this many chars */
1646 I32 dontbother = 0; /* how many characters not to try at end */
1647 I32 end_shift = 0; /* Same for the end. */ /* CC */
1648 I32 scream_pos = -1; /* Internal iterator of scream. */
1649 char *scream_olds = NULL;
1650 SV* const oreplsv = GvSV(PL_replgv);
1651 const bool do_utf8 = (bool)DO_UTF8(sv);
1654 regmatch_info reginfo; /* create some info to pass to regtry etc */
1656 GET_RE_DEBUG_FLAGS_DECL;
1658 PERL_UNUSED_ARG(data);
1660 /* Be paranoid... */
1661 if (prog == NULL || startpos == NULL) {
1662 Perl_croak(aTHX_ "NULL regexp parameter");
1666 multiline = prog->reganch & PMf_MULTILINE;
1667 reginfo.prog = prog;
1669 RX_MATCH_UTF8_set(prog, do_utf8);
1671 debug_start_match(prog, do_utf8, startpos, strend,
1675 minlen = prog->minlen;
1677 if (strend - startpos < (minlen+(prog->check_offset_min<0?prog->check_offset_min:0))) {
1678 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
1679 "String too short [regexec_flags]...\n"));
1684 /* Check validity of program. */
1685 if (UCHARAT(prog->program) != REG_MAGIC) {
1686 Perl_croak(aTHX_ "corrupted regexp program");
1690 PL_reg_eval_set = 0;
1693 if (prog->reganch & ROPT_UTF8)
1694 PL_reg_flags |= RF_utf8;
1696 /* Mark beginning of line for ^ and lookbehind. */
1697 reginfo.bol = startpos; /* XXX not used ??? */
1701 /* Mark end of line for $ (and such) */
1704 /* see how far we have to get to not match where we matched before */
1705 reginfo.till = startpos+minend;
1707 /* If there is a "must appear" string, look for it. */
1710 if (prog->reganch & ROPT_GPOS_SEEN) { /* Need to set reginfo->ganch */
1713 if (flags & REXEC_IGNOREPOS) /* Means: check only at start */
1714 reginfo.ganch = startpos;
1715 else if (sv && SvTYPE(sv) >= SVt_PVMG
1717 && (mg = mg_find(sv, PERL_MAGIC_regex_global))
1718 && mg->mg_len >= 0) {
1719 reginfo.ganch = strbeg + mg->mg_len; /* Defined pos() */
1720 if (prog->reganch & ROPT_ANCH_GPOS) {
1721 if (s > reginfo.ganch)
1726 else /* pos() not defined */
1727 reginfo.ganch = strbeg;
1729 if (PL_curpm && (PM_GETRE(PL_curpm) == prog)) {
1732 /* We have to be careful. If the previous successful match
1733 was from this regex we don't want a subsequent paritally
1734 successful match to clobber the old results.
1735 So when we detect this possibility we add a swap buffer
1736 to the re, and switch the buffer each match. If we fail
1737 we switch it back, otherwise we leave it swapped.
1739 Newxz(prog->swap, 1, regexp_paren_ofs);
1740 /* no need to copy these */
1741 Newxz(prog->swap->startp, prog->nparens + 1, I32);
1742 Newxz(prog->swap->endp, prog->nparens + 1, I32);
1744 t = prog->swap->startp;
1745 prog->swap->startp = prog->startp;
1747 t = prog->swap->endp;
1748 prog->swap->endp = prog->endp;
1751 if (!(flags & REXEC_CHECKED) && (prog->check_substr != NULL || prog->check_utf8 != NULL)) {
1752 re_scream_pos_data d;
1754 d.scream_olds = &scream_olds;
1755 d.scream_pos = &scream_pos;
1756 s = re_intuit_start(prog, sv, s, strend, flags, &d);
1758 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Not present...\n"));
1759 goto phooey; /* not present */
1765 /* Simplest case: anchored match need be tried only once. */
1766 /* [unless only anchor is BOL and multiline is set] */
1767 if (prog->reganch & (ROPT_ANCH & ~ROPT_ANCH_GPOS)) {
1768 if (s == startpos && regtry(®info, &startpos))
1770 else if (multiline || (prog->reganch & ROPT_IMPLICIT)
1771 || (prog->reganch & ROPT_ANCH_MBOL)) /* XXXX SBOL? */
1776 dontbother = minlen - 1;
1777 end = HOP3c(strend, -dontbother, strbeg) - 1;
1778 /* for multiline we only have to try after newlines */
1779 if (prog->check_substr || prog->check_utf8) {
1783 if (regtry(®info, &s))
1788 if (prog->reganch & RE_USE_INTUIT) {
1789 s = re_intuit_start(prog, sv, s + 1, strend, flags, NULL);
1800 if (*s++ == '\n') { /* don't need PL_utf8skip here */
1801 if (regtry(®info, &s))
1808 } else if (ROPT_GPOS_CHECK == (prog->reganch & ROPT_GPOS_CHECK))
1810 /* the warning about reginfo.ganch being used without intialization
1811 is bogus -- we set it above, when prog->reganch & ROPT_GPOS_SEEN
1812 and we only enter this block when the same bit is set. */
1813 if (regtry(®info, ®info.ganch))
1818 /* Messy cases: unanchored match. */
1819 if ((prog->anchored_substr || prog->anchored_utf8) && prog->reganch & ROPT_SKIP) {
1820 /* we have /x+whatever/ */
1821 /* it must be a one character string (XXXX Except UTF?) */
1826 if (!(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr))
1827 do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog);
1828 ch = SvPVX_const(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)[0];
1833 DEBUG_EXECUTE_r( did_match = 1 );
1834 if (regtry(®info, &s)) goto got_it;
1836 while (s < strend && *s == ch)
1844 DEBUG_EXECUTE_r( did_match = 1 );
1845 if (regtry(®info, &s)) goto got_it;
1847 while (s < strend && *s == ch)
1852 DEBUG_EXECUTE_r(if (!did_match)
1853 PerlIO_printf(Perl_debug_log,
1854 "Did not find anchored character...\n")
1857 else if (prog->anchored_substr != NULL
1858 || prog->anchored_utf8 != NULL
1859 || ((prog->float_substr != NULL || prog->float_utf8 != NULL)
1860 && prog->float_max_offset < strend - s)) {
1865 char *last1; /* Last position checked before */
1869 if (prog->anchored_substr || prog->anchored_utf8) {
1870 if (!(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr))
1871 do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog);
1872 must = do_utf8 ? prog->anchored_utf8 : prog->anchored_substr;
1873 back_max = back_min = prog->anchored_offset;
1875 if (!(do_utf8 ? prog->float_utf8 : prog->float_substr))
1876 do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog);
1877 must = do_utf8 ? prog->float_utf8 : prog->float_substr;
1878 back_max = prog->float_max_offset;
1879 back_min = prog->float_min_offset;
1883 if (must == &PL_sv_undef)
1884 /* could not downgrade utf8 check substring, so must fail */
1890 last = HOP3c(strend, /* Cannot start after this */
1891 -(I32)(CHR_SVLEN(must)
1892 - (SvTAIL(must) != 0) + back_min), strbeg);
1895 last1 = HOPc(s, -1);
1897 last1 = s - 1; /* bogus */
1899 /* XXXX check_substr already used to find "s", can optimize if
1900 check_substr==must. */
1902 dontbother = end_shift;
1903 strend = HOPc(strend, -dontbother);
1904 while ( (s <= last) &&
1905 ((flags & REXEC_SCREAM)
1906 ? (s = screaminstr(sv, must, HOP3c(s, back_min, (back_min<0 ? strbeg : strend)) - strbeg,
1907 end_shift, &scream_pos, 0))
1908 : (s = fbm_instr((unsigned char*)HOP3(s, back_min, (back_min<0 ? strbeg : strend)),
1909 (unsigned char*)strend, must,
1910 multiline ? FBMrf_MULTILINE : 0))) ) {
1911 /* we may be pointing at the wrong string */
1912 if ((flags & REXEC_SCREAM) && RX_MATCH_COPIED(prog))
1913 s = strbeg + (s - SvPVX_const(sv));
1914 DEBUG_EXECUTE_r( did_match = 1 );
1915 if (HOPc(s, -back_max) > last1) {
1916 last1 = HOPc(s, -back_min);
1917 s = HOPc(s, -back_max);
1920 char * const t = (last1 >= PL_bostr) ? HOPc(last1, 1) : last1 + 1;
1922 last1 = HOPc(s, -back_min);
1926 while (s <= last1) {
1927 if (regtry(®info, &s))
1933 while (s <= last1) {
1934 if (regtry(®info, &s))
1940 DEBUG_EXECUTE_r(if (!did_match) {
1941 RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0),
1942 SvPVX_const(must), RE_SV_DUMPLEN(must), 30);
1943 PerlIO_printf(Perl_debug_log, "Did not find %s substr %s%s...\n",
1944 ((must == prog->anchored_substr || must == prog->anchored_utf8)
1945 ? "anchored" : "floating"),
1946 quoted, RE_SV_TAIL(must));
1950 else if ( (c = prog->regstclass) ) {
1952 const OPCODE op = OP(prog->regstclass);
1953 /* don't bother with what can't match */
1954 if (PL_regkind[op] != EXACT && op != CANY && PL_regkind[op] != TRIE)
1955 strend = HOPc(strend, -(minlen - 1));
1958 SV * const prop = sv_newmortal();
1959 regprop(prog, prop, c);
1961 RE_PV_QUOTED_DECL(quoted,UTF,PERL_DEBUG_PAD_ZERO(1),
1963 PerlIO_printf(Perl_debug_log,
1964 "Matching stclass %.*s against %s (%d chars)\n",
1965 (int)SvCUR(prop), SvPVX_const(prop),
1966 quoted, (int)(strend - s));
1969 if (find_byclass(prog, c, s, strend, ®info))
1971 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Contradicts stclass... [regexec_flags]\n"));
1975 if (prog->float_substr != NULL || prog->float_utf8 != NULL) {
1980 if (!(do_utf8 ? prog->float_utf8 : prog->float_substr))
1981 do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog);
1982 float_real = do_utf8 ? prog->float_utf8 : prog->float_substr;
1984 if (flags & REXEC_SCREAM) {
1985 last = screaminstr(sv, float_real, s - strbeg,
1986 end_shift, &scream_pos, 1); /* last one */
1988 last = scream_olds; /* Only one occurrence. */
1989 /* we may be pointing at the wrong string */
1990 else if (RX_MATCH_COPIED(prog))
1991 s = strbeg + (s - SvPVX_const(sv));
1995 const char * const little = SvPV_const(float_real, len);
1997 if (SvTAIL(float_real)) {
1998 if (memEQ(strend - len + 1, little, len - 1))
1999 last = strend - len + 1;
2000 else if (!multiline)
2001 last = memEQ(strend - len, little, len)
2002 ? strend - len : NULL;
2008 last = rninstr(s, strend, little, little + len);
2010 last = strend; /* matching "$" */
2015 PerlIO_printf(Perl_debug_log,
2016 "%sCan't trim the tail, match fails (should not happen)%s\n",
2017 PL_colors[4], PL_colors[5]));
2018 goto phooey; /* Should not happen! */
2020 dontbother = strend - last + prog->float_min_offset;
2022 if (minlen && (dontbother < minlen))
2023 dontbother = minlen - 1;
2024 strend -= dontbother; /* this one's always in bytes! */
2025 /* We don't know much -- general case. */
2028 if (regtry(®info, &s))
2037 if (regtry(®info, &s))
2039 } while (s++ < strend);
2047 RX_MATCH_TAINTED_set(prog, PL_reg_flags & RF_tainted);
2049 if (PL_reg_eval_set) {
2050 /* Preserve the current value of $^R */
2051 if (oreplsv != GvSV(PL_replgv))
2052 sv_setsv(oreplsv, GvSV(PL_replgv));/* So that when GvSV(replgv) is
2053 restored, the value remains
2055 restore_pos(aTHX_ prog);
2057 if (prog->paren_names)
2058 (void)hv_iterinit(prog->paren_names);
2060 /* make sure $`, $&, $', and $digit will work later */
2061 if ( !(flags & REXEC_NOT_FIRST) ) {
2062 RX_MATCH_COPY_FREE(prog);
2063 if (flags & REXEC_COPY_STR) {
2064 const I32 i = PL_regeol - startpos + (stringarg - strbeg);
2065 #ifdef PERL_OLD_COPY_ON_WRITE
2067 || (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS)) {
2069 PerlIO_printf(Perl_debug_log,
2070 "Copy on write: regexp capture, type %d\n",
2073 prog->saved_copy = sv_setsv_cow(prog->saved_copy, sv);
2074 prog->subbeg = (char *)SvPVX_const(prog->saved_copy);
2075 assert (SvPOKp(prog->saved_copy));
2079 RX_MATCH_COPIED_on(prog);
2080 s = savepvn(strbeg, i);
2086 prog->subbeg = strbeg;
2087 prog->sublen = PL_regeol - strbeg; /* strend may have been modified */
2094 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch failed%s\n",
2095 PL_colors[4], PL_colors[5]));
2096 if (PL_reg_eval_set)
2097 restore_pos(aTHX_ prog);
2099 /* we failed :-( roll it back */
2101 t = prog->swap->startp;
2102 prog->swap->startp = prog->startp;
2104 t = prog->swap->endp;
2105 prog->swap->endp = prog->endp;
2113 - regtry - try match at specific point
2115 STATIC I32 /* 0 failure, 1 success */
2116 S_regtry(pTHX_ regmatch_info *reginfo, char **startpos)
2122 regexp *prog = reginfo->prog;
2123 GET_RE_DEBUG_FLAGS_DECL;
2124 reginfo->cutpoint=NULL;
2126 if ((prog->reganch & ROPT_EVAL_SEEN) && !PL_reg_eval_set) {
2129 PL_reg_eval_set = RS_init;
2130 DEBUG_EXECUTE_r(DEBUG_s(
2131 PerlIO_printf(Perl_debug_log, " setting stack tmpbase at %"IVdf"\n",
2132 (IV)(PL_stack_sp - PL_stack_base));
2135 cxstack[cxstack_ix].blk_oldsp = PL_stack_sp - PL_stack_base;
2136 /* Otherwise OP_NEXTSTATE will free whatever on stack now. */
2138 /* Apparently this is not needed, judging by wantarray. */
2139 /* SAVEI8(cxstack[cxstack_ix].blk_gimme);
2140 cxstack[cxstack_ix].blk_gimme = G_SCALAR; */
2143 /* Make $_ available to executed code. */
2144 if (reginfo->sv != DEFSV) {
2146 DEFSV = reginfo->sv;
2149 if (!(SvTYPE(reginfo->sv) >= SVt_PVMG && SvMAGIC(reginfo->sv)
2150 && (mg = mg_find(reginfo->sv, PERL_MAGIC_regex_global)))) {
2151 /* prepare for quick setting of pos */
2152 #ifdef PERL_OLD_COPY_ON_WRITE
2153 if (SvIsCOW(reginfo->sv))
2154 sv_force_normal_flags(reginfo->sv, 0);
2156 mg = sv_magicext(reginfo->sv, NULL, PERL_MAGIC_regex_global,
2157 &PL_vtbl_mglob, NULL, 0);
2161 PL_reg_oldpos = mg->mg_len;
2162 SAVEDESTRUCTOR_X(restore_pos, prog);
2164 if (!PL_reg_curpm) {
2165 Newxz(PL_reg_curpm, 1, PMOP);
2168 SV* const repointer = newSViv(0);
2169 /* so we know which PL_regex_padav element is PL_reg_curpm */
2170 SvFLAGS(repointer) |= SVf_BREAK;
2171 av_push(PL_regex_padav,repointer);
2172 PL_reg_curpm->op_pmoffset = av_len(PL_regex_padav);
2173 PL_regex_pad = AvARRAY(PL_regex_padav);
2177 PM_SETRE(PL_reg_curpm, prog);
2178 PL_reg_oldcurpm = PL_curpm;
2179 PL_curpm = PL_reg_curpm;
2180 if (RX_MATCH_COPIED(prog)) {
2181 /* Here is a serious problem: we cannot rewrite subbeg,
2182 since it may be needed if this match fails. Thus
2183 $` inside (?{}) could fail... */
2184 PL_reg_oldsaved = prog->subbeg;
2185 PL_reg_oldsavedlen = prog->sublen;
2186 #ifdef PERL_OLD_COPY_ON_WRITE
2187 PL_nrs = prog->saved_copy;
2189 RX_MATCH_COPIED_off(prog);
2192 PL_reg_oldsaved = NULL;
2193 prog->subbeg = PL_bostr;
2194 prog->sublen = PL_regeol - PL_bostr; /* strend may have been modified */
2196 DEBUG_EXECUTE_r(PL_reg_starttry = *startpos);
2197 prog->startp[0] = *startpos - PL_bostr;
2198 PL_reginput = *startpos;
2199 PL_reglastparen = &prog->lastparen;
2200 PL_reglastcloseparen = &prog->lastcloseparen;
2201 prog->lastparen = 0;
2202 prog->lastcloseparen = 0;
2204 PL_regstartp = prog->startp;
2205 PL_regendp = prog->endp;
2206 if (PL_reg_start_tmpl <= prog->nparens) {
2207 PL_reg_start_tmpl = prog->nparens*3/2 + 3;
2208 if(PL_reg_start_tmp)
2209 Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*);
2211 Newx(PL_reg_start_tmp, PL_reg_start_tmpl, char*);
2214 /* XXXX What this code is doing here?!!! There should be no need
2215 to do this again and again, PL_reglastparen should take care of
2218 /* Tests pat.t#187 and split.t#{13,14} seem to depend on this code.
2219 * Actually, the code in regcppop() (which Ilya may be meaning by
2220 * PL_reglastparen), is not needed at all by the test suite
2221 * (op/regexp, op/pat, op/split), but that code is needed, oddly
2222 * enough, for building DynaLoader, or otherwise this
2223 * "Error: '*' not in typemap in DynaLoader.xs, line 164"
2224 * will happen. Meanwhile, this code *is* needed for the
2225 * above-mentioned test suite tests to succeed. The common theme
2226 * on those tests seems to be returning null fields from matches.
2231 if (prog->nparens) {
2233 for (i = prog->nparens; i > (I32)*PL_reglastparen; i--) {
2240 if (regmatch(reginfo, prog->program + 1)) {
2241 PL_regendp[0] = PL_reginput - PL_bostr;
2244 if (reginfo->cutpoint)
2245 *startpos= reginfo->cutpoint;
2246 REGCP_UNWIND(lastcp);
2251 #define sayYES goto yes
2252 #define sayNO goto no
2253 #define sayNO_SILENT goto no_silent
2255 /* we dont use STMT_START/END here because it leads to
2256 "unreachable code" warnings, which are bogus, but distracting. */
2257 #define CACHEsayNO \
2258 if (ST.cache_mask) \
2259 PL_reg_poscache[ST.cache_offset] |= ST.cache_mask; \
2262 /* this is used to determine how far from the left messages like
2263 'failed...' are printed. It should be set such that messages
2264 are inline with the regop output that created them.
2266 #define REPORT_CODE_OFF 32
2269 /* Make sure there is a test for this +1 options in re_tests */
2270 #define TRIE_INITAL_ACCEPT_BUFFLEN 4;
2272 #define CHRTEST_UNINIT -1001 /* c1/c2 haven't been calculated yet */
2273 #define CHRTEST_VOID -1000 /* the c1/c2 "next char" test should be skipped */
2275 #define SLAB_FIRST(s) (&(s)->states[0])
2276 #define SLAB_LAST(s) (&(s)->states[PERL_REGMATCH_SLAB_SLOTS-1])
2278 /* grab a new slab and return the first slot in it */
2280 STATIC regmatch_state *
2283 #if PERL_VERSION < 9
2286 regmatch_slab *s = PL_regmatch_slab->next;
2288 Newx(s, 1, regmatch_slab);
2289 s->prev = PL_regmatch_slab;
2291 PL_regmatch_slab->next = s;
2293 PL_regmatch_slab = s;
2294 return SLAB_FIRST(s);
2298 /* push a new state then goto it */
2300 #define PUSH_STATE_GOTO(state, node) \
2302 st->resume_state = state; \
2305 /* push a new state with success backtracking, then goto it */
2307 #define PUSH_YES_STATE_GOTO(state, node) \
2309 st->resume_state = state; \
2310 goto push_yes_state;
2316 regmatch() - main matching routine
2318 This is basically one big switch statement in a loop. We execute an op,
2319 set 'next' to point the next op, and continue. If we come to a point which
2320 we may need to backtrack to on failure such as (A|B|C), we push a
2321 backtrack state onto the backtrack stack. On failure, we pop the top
2322 state, and re-enter the loop at the state indicated. If there are no more
2323 states to pop, we return failure.
2325 Sometimes we also need to backtrack on success; for example /A+/, where
2326 after successfully matching one A, we need to go back and try to
2327 match another one; similarly for lookahead assertions: if the assertion
2328 completes successfully, we backtrack to the state just before the assertion
2329 and then carry on. In these cases, the pushed state is marked as
2330 'backtrack on success too'. This marking is in fact done by a chain of
2331 pointers, each pointing to the previous 'yes' state. On success, we pop to
2332 the nearest yes state, discarding any intermediate failure-only states.
2333 Sometimes a yes state is pushed just to force some cleanup code to be
2334 called at the end of a successful match or submatch; e.g. (??{$re}) uses
2335 it to free the inner regex.
2337 Note that failure backtracking rewinds the cursor position, while
2338 success backtracking leaves it alone.
2340 A pattern is complete when the END op is executed, while a subpattern
2341 such as (?=foo) is complete when the SUCCESS op is executed. Both of these
2342 ops trigger the "pop to last yes state if any, otherwise return true"
2345 A common convention in this function is to use A and B to refer to the two
2346 subpatterns (or to the first nodes thereof) in patterns like /A*B/: so A is
2347 the subpattern to be matched possibly multiple times, while B is the entire
2348 rest of the pattern. Variable and state names reflect this convention.
2350 The states in the main switch are the union of ops and failure/success of
2351 substates associated with with that op. For example, IFMATCH is the op
2352 that does lookahead assertions /(?=A)B/ and so the IFMATCH state means
2353 'execute IFMATCH'; while IFMATCH_A is a state saying that we have just
2354 successfully matched A and IFMATCH_A_fail is a state saying that we have
2355 just failed to match A. Resume states always come in pairs. The backtrack
2356 state we push is marked as 'IFMATCH_A', but when that is popped, we resume
2357 at IFMATCH_A or IFMATCH_A_fail, depending on whether we are backtracking
2358 on success or failure.
2360 The struct that holds a backtracking state is actually a big union, with
2361 one variant for each major type of op. The variable st points to the
2362 top-most backtrack struct. To make the code clearer, within each
2363 block of code we #define ST to alias the relevant union.
2365 Here's a concrete example of a (vastly oversimplified) IFMATCH
2371 #define ST st->u.ifmatch
2373 case IFMATCH: // we are executing the IFMATCH op, (?=A)B
2374 ST.foo = ...; // some state we wish to save
2376 // push a yes backtrack state with a resume value of
2377 // IFMATCH_A/IFMATCH_A_fail, then continue execution at the
2379 PUSH_YES_STATE_GOTO(IFMATCH_A, A);
2382 case IFMATCH_A: // we have successfully executed A; now continue with B
2384 bar = ST.foo; // do something with the preserved value
2387 case IFMATCH_A_fail: // A failed, so the assertion failed
2388 ...; // do some housekeeping, then ...
2389 sayNO; // propagate the failure
2396 For any old-timers reading this who are familiar with the old recursive
2397 approach, the code above is equivalent to:
2399 case IFMATCH: // we are executing the IFMATCH op, (?=A)B
2408 ...; // do some housekeeping, then ...
2409 sayNO; // propagate the failure
2412 The topmost backtrack state, pointed to by st, is usually free. If you
2413 want to claim it, populate any ST.foo fields in it with values you wish to
2414 save, then do one of
2416 PUSH_STATE_GOTO(resume_state, node);
2417 PUSH_YES_STATE_GOTO(resume_state, node);
2419 which sets that backtrack state's resume value to 'resume_state', pushes a
2420 new free entry to the top of the backtrack stack, then goes to 'node'.
2421 On backtracking, the free slot is popped, and the saved state becomes the
2422 new free state. An ST.foo field in this new top state can be temporarily
2423 accessed to retrieve values, but once the main loop is re-entered, it
2424 becomes available for reuse.
2426 Note that the depth of the backtrack stack constantly increases during the
2427 left-to-right execution of the pattern, rather than going up and down with
2428 the pattern nesting. For example the stack is at its maximum at Z at the
2429 end of the pattern, rather than at X in the following:
2431 /(((X)+)+)+....(Y)+....Z/
2433 The only exceptions to this are lookahead/behind assertions and the cut,
2434 (?>A), which pop all the backtrack states associated with A before
2437 Bascktrack state structs are allocated in slabs of about 4K in size.
2438 PL_regmatch_state and st always point to the currently active state,
2439 and PL_regmatch_slab points to the slab currently containing
2440 PL_regmatch_state. The first time regmatch() is called, the first slab is
2441 allocated, and is never freed until interpreter destruction. When the slab
2442 is full, a new one is allocated and chained to the end. At exit from
2443 regmatch(), slabs allocated since entry are freed.
2448 #define DEBUG_STATE_pp(pp) \
2450 DUMP_EXEC_POS(locinput, scan, do_utf8); \
2451 PerlIO_printf(Perl_debug_log, \
2452 " %*s"pp" %s%s%s%s%s\n", \
2454 reg_name[st->resume_state], \
2455 ((st==yes_state||st==mark_state) ? "[" : ""), \
2456 ((st==yes_state) ? "Y" : ""), \
2457 ((st==mark_state) ? "M" : ""), \
2458 ((st==yes_state||st==mark_state) ? "]" : "") \
2463 #define REG_NODE_NUM(x) ((x) ? (int)((x)-prog) : -1)
2468 S_debug_start_match(pTHX_ const regexp *prog, const bool do_utf8,
2469 const char *start, const char *end, const char *blurb)
2471 const bool utf8_pat= prog->reganch & ROPT_UTF8 ? 1 : 0;
2475 RE_PV_QUOTED_DECL(s0, utf8_pat, PERL_DEBUG_PAD_ZERO(0),
2476 prog->precomp, prog->prelen, 60);
2478 RE_PV_QUOTED_DECL(s1, do_utf8, PERL_DEBUG_PAD_ZERO(1),
2479 start, end - start, 60);
2481 PerlIO_printf(Perl_debug_log,
2482 "%s%s REx%s %s against %s\n",
2483 PL_colors[4], blurb, PL_colors[5], s0, s1);
2485 if (do_utf8||utf8_pat)
2486 PerlIO_printf(Perl_debug_log, "UTF-8 %s%s%s...\n",
2487 utf8_pat ? "pattern" : "",
2488 utf8_pat && do_utf8 ? " and " : "",
2489 do_utf8 ? "string" : ""
2495 S_dump_exec_pos(pTHX_ const char *locinput,
2496 const regnode *scan,
2497 const char *loc_regeol,
2498 const char *loc_bostr,
2499 const char *loc_reg_starttry,
2502 const int docolor = *PL_colors[0] || *PL_colors[2] || *PL_colors[4];
2503 const int taill = (docolor ? 10 : 7); /* 3 chars for "> <" */
2504 int l = (loc_regeol - locinput) > taill ? taill : (loc_regeol - locinput);
2505 /* The part of the string before starttry has one color
2506 (pref0_len chars), between starttry and current
2507 position another one (pref_len - pref0_len chars),
2508 after the current position the third one.
2509 We assume that pref0_len <= pref_len, otherwise we
2510 decrease pref0_len. */
2511 int pref_len = (locinput - loc_bostr) > (5 + taill) - l
2512 ? (5 + taill) - l : locinput - loc_bostr;
2515 while (do_utf8 && UTF8_IS_CONTINUATION(*(U8*)(locinput - pref_len)))
2517 pref0_len = pref_len - (locinput - loc_reg_starttry);
2518 if (l + pref_len < (5 + taill) && l < loc_regeol - locinput)
2519 l = ( loc_regeol - locinput > (5 + taill) - pref_len
2520 ? (5 + taill) - pref_len : loc_regeol - locinput);
2521 while (do_utf8 && UTF8_IS_CONTINUATION(*(U8*)(locinput + l)))
2525 if (pref0_len > pref_len)
2526 pref0_len = pref_len;
2528 const int is_uni = (do_utf8 && OP(scan) != CANY) ? 1 : 0;
2530 RE_PV_COLOR_DECL(s0,len0,is_uni,PERL_DEBUG_PAD(0),
2531 (locinput - pref_len),pref0_len, 60, 4, 5);
2533 RE_PV_COLOR_DECL(s1,len1,is_uni,PERL_DEBUG_PAD(1),
2534 (locinput - pref_len + pref0_len),
2535 pref_len - pref0_len, 60, 2, 3);
2537 RE_PV_COLOR_DECL(s2,len2,is_uni,PERL_DEBUG_PAD(2),
2538 locinput, loc_regeol - locinput, 10, 0, 1);
2540 const STRLEN tlen=len0+len1+len2;
2541 PerlIO_printf(Perl_debug_log,
2542 "%4"IVdf" <%.*s%.*s%s%.*s>%*s|",
2543 (IV)(locinput - loc_bostr),
2546 (docolor ? "" : "> <"),
2548 (int)(tlen > 19 ? 0 : 19 - tlen),
2555 /* reg_check_named_buff_matched()
2556 * Checks to see if a named buffer has matched. The data array of
2557 * buffer numbers corresponding to the buffer is expected to reside
2558 * in the regexp->data->data array in the slot stored in the ARG() of
2559 * node involved. Note that this routine doesn't actually care about the
2560 * name, that information is not preserved from compilation to execution.
2561 * Returns the index of the leftmost defined buffer with the given name
2562 * or 0 if non of the buffers matched.
2565 S_reg_check_named_buff_matched(pTHX_ const regexp *rex, const regnode *scan) {
2567 SV *sv_dat=(SV*)rex->data->data[ ARG( scan ) ];
2568 I32 *nums=(I32*)SvPVX(sv_dat);
2569 for ( n=0; n<SvIVX(sv_dat); n++ ) {
2570 if ((I32)*PL_reglastparen >= nums[n] &&
2571 PL_regendp[nums[n]] != -1)
2579 STATIC I32 /* 0 failure, 1 success */
2580 S_regmatch(pTHX_ regmatch_info *reginfo, regnode *prog)
2582 #if PERL_VERSION < 9
2586 register const bool do_utf8 = PL_reg_match_utf8;
2587 const U32 uniflags = UTF8_ALLOW_DEFAULT;
2589 regexp *rex = reginfo->prog;
2591 regmatch_slab *orig_slab;
2592 regmatch_state *orig_state;
2594 /* the current state. This is a cached copy of PL_regmatch_state */
2595 register regmatch_state *st;
2597 /* cache heavy used fields of st in registers */
2598 register regnode *scan;
2599 register regnode *next;
2600 register U32 n = 0; /* general value; init to avoid compiler warning */
2601 register I32 ln = 0; /* len or last; init to avoid compiler warning */
2602 register char *locinput = PL_reginput;
2603 register I32 nextchr; /* is always set to UCHARAT(locinput) */
2605 bool result = 0; /* return value of S_regmatch */
2606 int depth = 0; /* depth of backtrack stack */
2607 int nochange_depth = 0; /* depth of GOSUB recursion with nochange*/
2608 regmatch_state *yes_state = NULL; /* state to pop to on success of
2610 /* mark_state piggy backs on the yes_state logic so that when we unwind
2611 the stack on success we can update the mark_state as we go */
2612 regmatch_state *mark_state = NULL; /* last mark state we have seen */
2614 regmatch_state *cur_eval = NULL; /* most recent EVAL_AB state */
2615 struct regmatch_state *cur_curlyx = NULL; /* most recent curlyx */
2617 bool no_final = 0; /* prevent failure from backtracking? */
2618 bool do_cutgroup = 0; /* no_final only until next branch/trie entry */
2619 char *startpoint = PL_reginput;
2620 SV *popmark = NULL; /* are we looking for a mark? */
2621 SV *sv_commit = NULL; /* last mark name seen in failure */
2622 SV *sv_yes_mark = NULL; /* last mark name we have seen
2623 during a successfull match */
2624 U32 lastopen = 0; /* last open we saw */
2625 bool has_cutgroup = RX_HAS_CUTGROUP(rex) ? 1 : 0;
2627 /* these three flags are set by various ops to signal information to
2628 * the very next op. They have a useful lifetime of exactly one loop
2629 * iteration, and are not preserved or restored by state pushes/pops
2631 bool sw = 0; /* the condition value in (?(cond)a|b) */
2632 bool minmod = 0; /* the next "{n,m}" is a "{n,m}?" */
2633 int logical = 0; /* the following EVAL is:
2637 or the following IFMATCH/UNLESSM is:
2638 false: plain (?=foo)
2639 true: used as a condition: (?(?=foo))
2643 GET_RE_DEBUG_FLAGS_DECL;
2647 PerlIO_printf(Perl_debug_log,"regmatch start\n");
2649 /* on first ever call to regmatch, allocate first slab */
2650 if (!PL_regmatch_slab) {
2651 Newx(PL_regmatch_slab, 1, regmatch_slab);
2652 PL_regmatch_slab->prev = NULL;
2653 PL_regmatch_slab->next = NULL;
2654 PL_regmatch_state = SLAB_FIRST(PL_regmatch_slab);
2657 /* remember current high-water mark for exit */
2658 /* XXX this should be done with SAVE* instead */
2659 orig_slab = PL_regmatch_slab;
2660 orig_state = PL_regmatch_state;
2662 /* grab next free state slot */
2663 st = ++PL_regmatch_state;
2664 if (st > SLAB_LAST(PL_regmatch_slab))
2665 st = PL_regmatch_state = S_push_slab(aTHX);
2667 /* Note that nextchr is a byte even in UTF */
2668 nextchr = UCHARAT(locinput);
2670 while (scan != NULL) {
2673 SV * const prop = sv_newmortal();
2674 regnode *rnext=regnext(scan);
2675 DUMP_EXEC_POS( locinput, scan, do_utf8 );
2676 regprop(rex, prop, scan);
2678 PerlIO_printf(Perl_debug_log,
2679 "%3"IVdf":%*s%s(%"IVdf")\n",
2680 (IV)(scan - rex->program), depth*2, "",
2682 (PL_regkind[OP(scan)] == END || !rnext) ?
2683 0 : (IV)(rnext - rex->program));
2686 next = scan + NEXT_OFF(scan);
2689 state_num = OP(scan);
2692 switch (state_num) {
2694 if (locinput == PL_bostr)
2696 /* reginfo->till = reginfo->bol; */
2701 if (locinput == PL_bostr ||
2702 ((nextchr || locinput < PL_regeol) && locinput[-1] == '\n'))
2708 if (locinput == PL_bostr)
2712 if (locinput == reginfo->ganch)
2718 if ((nextchr || locinput < PL_regeol) && nextchr != '\n')
2723 if ((nextchr || locinput < PL_regeol) && nextchr != '\n')
2725 if (PL_regeol - locinput > 1)
2729 if (PL_regeol != locinput)
2733 if (!nextchr && locinput >= PL_regeol)
2736 locinput += PL_utf8skip[nextchr];
2737 if (locinput > PL_regeol)
2739 nextchr = UCHARAT(locinput);
2742 nextchr = UCHARAT(++locinput);
2745 if (!nextchr && locinput >= PL_regeol)
2747 nextchr = UCHARAT(++locinput);
2750 if ((!nextchr && locinput >= PL_regeol) || nextchr == '\n')
2753 locinput += PL_utf8skip[nextchr];
2754 if (locinput > PL_regeol)
2756 nextchr = UCHARAT(locinput);
2759 nextchr = UCHARAT(++locinput);
2763 #define ST st->u.trie
2765 /* In this case the charclass data is available inline so
2766 we can fail fast without a lot of extra overhead.
2768 if (scan->flags == EXACT || !do_utf8) {
2769 if(!ANYOF_BITMAP_TEST(scan, *locinput)) {
2771 PerlIO_printf(Perl_debug_log,
2772 "%*s %sfailed to match trie start class...%s\n",
2773 REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5])
2782 /* what type of TRIE am I? (utf8 makes this contextual) */
2783 const enum { trie_plain, trie_utf8, trie_utf8_fold }
2784 trie_type = do_utf8 ?
2785 (scan->flags == EXACT ? trie_utf8 : trie_utf8_fold)
2788 /* what trie are we using right now */
2789 reg_trie_data * const trie
2790 = (reg_trie_data*)rex->data->data[ ARG( scan ) ];
2791 U32 state = trie->startstate;
2793 if (trie->bitmap && trie_type != trie_utf8_fold &&
2794 !TRIE_BITMAP_TEST(trie,*locinput)
2796 if (trie->states[ state ].wordnum) {
2798 PerlIO_printf(Perl_debug_log,
2799 "%*s %smatched empty string...%s\n",
2800 REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5])
2805 PerlIO_printf(Perl_debug_log,
2806 "%*s %sfailed to match trie start class...%s\n",
2807 REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5])
2814 U8 *uc = ( U8* )locinput;
2818 U8 *uscan = (U8*)NULL;
2820 SV *sv_accept_buff = NULL;
2821 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
2823 ST.accepted = 0; /* how many accepting states we have seen */
2825 ST.jump = trie->jump;
2829 traverse the TRIE keeping track of all accepting states
2830 we transition through until we get to a failing node.
2833 while ( state && uc <= (U8*)PL_regeol ) {
2834 U32 base = trie->states[ state ].trans.base;
2837 /* We use charid to hold the wordnum as we don't use it
2838 for charid until after we have done the wordnum logic.
2839 We define an alias just so that the wordnum logic reads
2842 #define got_wordnum charid
2843 got_wordnum = trie->states[ state ].wordnum;
2845 if ( got_wordnum ) {
2846 if ( ! ST.accepted ) {
2849 bufflen = TRIE_INITAL_ACCEPT_BUFFLEN;
2850 sv_accept_buff=newSV(bufflen *
2851 sizeof(reg_trie_accepted) - 1);
2852 SvCUR_set(sv_accept_buff, 0);
2853 SvPOK_on(sv_accept_buff);
2854 sv_2mortal(sv_accept_buff);
2857 (reg_trie_accepted*)SvPV_nolen(sv_accept_buff );
2860 if (ST.accepted >= bufflen) {
2862 ST.accept_buff =(reg_trie_accepted*)
2863 SvGROW(sv_accept_buff,
2864 bufflen * sizeof(reg_trie_accepted));
2866 SvCUR_set(sv_accept_buff,SvCUR(sv_accept_buff)
2867 + sizeof(reg_trie_accepted));
2870 ST.accept_buff[ST.accepted].wordnum = got_wordnum;
2871 ST.accept_buff[ST.accepted].endpos = uc;
2873 } while (trie->nextword && (got_wordnum= trie->nextword[got_wordnum]));
2877 DEBUG_TRIE_EXECUTE_r({
2878 DUMP_EXEC_POS( (char *)uc, scan, do_utf8 );
2879 PerlIO_printf( Perl_debug_log,
2880 "%*s %sState: %4"UVxf" Accepted: %4"UVxf" ",
2881 2+depth * 2, "", PL_colors[4],
2882 (UV)state, (UV)ST.accepted );
2886 REXEC_TRIE_READ_CHAR(trie_type, trie, uc, uscan, len,
2887 uvc, charid, foldlen, foldbuf, uniflags);
2890 (base + charid > trie->uniquecharcount )
2891 && (base + charid - 1 - trie->uniquecharcount
2893 && trie->trans[base + charid - 1 -
2894 trie->uniquecharcount].check == state)
2896 state = trie->trans[base + charid - 1 -
2897 trie->uniquecharcount ].next;
2908 DEBUG_TRIE_EXECUTE_r(
2909 PerlIO_printf( Perl_debug_log,
2910 "Charid:%3x CP:%4"UVxf" After State: %4"UVxf"%s\n",
2911 charid, uvc, (UV)state, PL_colors[5] );
2918 PerlIO_printf( Perl_debug_log,
2919 "%*s %sgot %"IVdf" possible matches%s\n",
2920 REPORT_CODE_OFF + depth * 2, "",
2921 PL_colors[4], (IV)ST.accepted, PL_colors[5] );
2926 case TRIE_next_fail: /* we failed - try next alterative */
2931 if ( ST.accepted == 1 ) {
2932 /* only one choice left - just continue */
2934 reg_trie_data * const trie
2935 = (reg_trie_data*)rex->data->data[ ARG(ST.me) ];
2936 SV ** const tmp = av_fetch( trie->words,
2937 ST.accept_buff[ 0 ].wordnum-1, 0 );
2938 PerlIO_printf( Perl_debug_log,
2939 "%*s %sonly one match left: #%d <%s>%s\n",
2940 REPORT_CODE_OFF+depth*2, "", PL_colors[4],
2941 ST.accept_buff[ 0 ].wordnum,
2942 tmp ? SvPV_nolen_const( *tmp ) : "not compiled under -Dr",
2945 PL_reginput = (char *)ST.accept_buff[ 0 ].endpos;
2946 /* in this case we free tmps/leave before we call regmatch
2947 as we wont be using accept_buff again. */
2949 locinput = PL_reginput;
2950 nextchr = UCHARAT(locinput);
2951 if ( !ST.jump || !ST.jump[ST.accept_buff[0].wordnum])
2954 scan = ST.me + ST.jump[ST.accept_buff[0].wordnum];
2955 if (!has_cutgroup) {
2960 PUSH_YES_STATE_GOTO(TRIE_next, scan);
2963 continue; /* execute rest of RE */
2966 if (!ST.accepted-- ) {
2968 PerlIO_printf( Perl_debug_log,
2969 "%*s %sTRIE failed...%s\n",
2970 REPORT_CODE_OFF+depth*2, "",
2980 There are at least two accepting states left. Presumably
2981 the number of accepting states is going to be low,
2982 typically two. So we simply scan through to find the one
2983 with lowest wordnum. Once we find it, we swap the last
2984 state into its place and decrement the size. We then try to
2985 match the rest of the pattern at the point where the word
2986 ends. If we succeed, control just continues along the
2987 regex; if we fail we return here to try the next accepting
2994 for( cur = 1 ; cur <= ST.accepted ; cur++ ) {
2995 DEBUG_TRIE_EXECUTE_r(
2996 PerlIO_printf( Perl_debug_log,
2997 "%*s %sgot %"IVdf" (%d) as best, looking at %"IVdf" (%d)%s\n",
2998 REPORT_CODE_OFF + depth * 2, "", PL_colors[4],
2999 (IV)best, ST.accept_buff[ best ].wordnum, (IV)cur,
3000 ST.accept_buff[ cur ].wordnum, PL_colors[5] );
3003 if (ST.accept_buff[cur].wordnum <
3004 ST.accept_buff[best].wordnum)
3009 reg_trie_data * const trie
3010 = (reg_trie_data*)rex->data->data[ ARG(ST.me) ];
3011 SV ** const tmp = av_fetch( trie->words,
3012 ST.accept_buff[ best ].wordnum - 1, 0 );
3013 regnode *nextop=(!ST.jump || !ST.jump[ST.accept_buff[best].wordnum]) ?
3015 ST.me + ST.jump[ST.accept_buff[best].wordnum];
3016 PerlIO_printf( Perl_debug_log,
3017 "%*s %strying alternation #%d <%s> at node #%d %s\n",
3018 REPORT_CODE_OFF+depth*2, "", PL_colors[4],
3019 ST.accept_buff[best].wordnum,
3020 tmp ? SvPV_nolen_const( *tmp ) : "not compiled under -Dr",
3021 REG_NODE_NUM(nextop),
3025 if ( best<ST.accepted ) {
3026 reg_trie_accepted tmp = ST.accept_buff[ best ];
3027 ST.accept_buff[ best ] = ST.accept_buff[ ST.accepted ];
3028 ST.accept_buff[ ST.accepted ] = tmp;
3031 PL_reginput = (char *)ST.accept_buff[ best ].endpos;
3032 if ( !ST.jump || !ST.jump[ST.accept_buff[best].wordnum]) {
3036 scan = ST.me + ST.jump[ST.accept_buff[best].wordnum];
3040 PUSH_YES_STATE_GOTO(TRIE_next, scan);
3043 PUSH_STATE_GOTO(TRIE_next, scan);
3056 char *s = STRING(scan);
3058 if (do_utf8 != UTF) {
3059 /* The target and the pattern have differing utf8ness. */
3061 const char * const e = s + ln;
3064 /* The target is utf8, the pattern is not utf8. */
3069 if (NATIVE_TO_UNI(*(U8*)s) !=
3070 utf8n_to_uvuni((U8*)l, UTF8_MAXBYTES, &ulen,
3078 /* The target is not utf8, the pattern is utf8. */
3083 if (NATIVE_TO_UNI(*((U8*)l)) !=
3084 utf8n_to_uvuni((U8*)s, UTF8_MAXBYTES, &ulen,
3092 nextchr = UCHARAT(locinput);
3095 /* The target and the pattern have the same utf8ness. */
3096 /* Inline the first character, for speed. */
3097 if (UCHARAT(s) != nextchr)
3099 if (PL_regeol - locinput < ln)
3101 if (ln > 1 && memNE(s, locinput, ln))
3104 nextchr = UCHARAT(locinput);
3108 PL_reg_flags |= RF_tainted;
3111 char * const s = STRING(scan);
3114 if (do_utf8 || UTF) {
3115 /* Either target or the pattern are utf8. */
3116 const char * const l = locinput;
3117 char *e = PL_regeol;
3119 if (ibcmp_utf8(s, 0, ln, (bool)UTF,
3120 l, &e, 0, do_utf8)) {
3121 /* One more case for the sharp s:
3122 * pack("U0U*", 0xDF) =~ /ss/i,
3123 * the 0xC3 0x9F are the UTF-8
3124 * byte sequence for the U+00DF. */
3126 toLOWER(s[0]) == 's' &&
3128 toLOWER(s[1]) == 's' &&
3135 nextchr = UCHARAT(locinput);
3139 /* Neither the target and the pattern are utf8. */
3141 /* Inline the first character, for speed. */
3142 if (UCHARAT(s) != nextchr &&
3143 UCHARAT(s) != ((OP(scan) == EXACTF)
3144 ? PL_fold : PL_fold_locale)[nextchr])
3146 if (PL_regeol - locinput < ln)
3148 if (ln > 1 && (OP(scan) == EXACTF
3149 ? ibcmp(s, locinput, ln)
3150 : ibcmp_locale(s, locinput, ln)))
3153 nextchr = UCHARAT(locinput);
3158 STRLEN inclasslen = PL_regeol - locinput;
3160 if (!reginclass(rex, scan, (U8*)locinput, &inclasslen, do_utf8))
3162 if (locinput >= PL_regeol)
3164 locinput += inclasslen ? inclasslen : UTF8SKIP(locinput);
3165 nextchr = UCHARAT(locinput);
3170 nextchr = UCHARAT(locinput);
3171 if (!REGINCLASS(rex, scan, (U8*)locinput))
3173 if (!nextchr && locinput >= PL_regeol)
3175 nextchr = UCHARAT(++locinput);
3179 /* If we might have the case of the German sharp s
3180 * in a casefolding Unicode character class. */
3182 if (ANYOF_FOLD_SHARP_S(scan, locinput, PL_regeol)) {
3183 locinput += SHARP_S_SKIP;
3184 nextchr = UCHARAT(locinput);
3190 PL_reg_flags |= RF_tainted;
3196 LOAD_UTF8_CHARCLASS_ALNUM();
3197 if (!(OP(scan) == ALNUM
3198 ? (bool)swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8)
3199 : isALNUM_LC_utf8((U8*)locinput)))
3203 locinput += PL_utf8skip[nextchr];
3204 nextchr = UCHARAT(locinput);
3207 if (!(OP(scan) == ALNUM
3208 ? isALNUM(nextchr) : isALNUM_LC(nextchr)))
3210 nextchr = UCHARAT(++locinput);
3213 PL_reg_flags |= RF_tainted;
3216 if (!nextchr && locinput >= PL_regeol)
3219 LOAD_UTF8_CHARCLASS_ALNUM();
3220 if (OP(scan) == NALNUM
3221 ? (bool)swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8)
3222 : isALNUM_LC_utf8((U8*)locinput))
3226 locinput += PL_utf8skip[nextchr];
3227 nextchr = UCHARAT(locinput);
3230 if (OP(scan) == NALNUM
3231 ? isALNUM(nextchr) : isALNUM_LC(nextchr))
3233 nextchr = UCHARAT(++locinput);
3237 PL_reg_flags |= RF_tainted;
3241 /* was last char in word? */
3243 if (locinput == PL_bostr)
3246 const U8 * const r = reghop3((U8*)locinput, -1, (U8*)PL_bostr);
3248 ln = utf8n_to_uvchr(r, UTF8SKIP(r), 0, uniflags);
3250 if (OP(scan) == BOUND || OP(scan) == NBOUND) {
3251 ln = isALNUM_uni(ln);
3252 LOAD_UTF8_CHARCLASS_ALNUM();
3253 n = swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8);
3256 ln = isALNUM_LC_uvchr(UNI_TO_NATIVE(ln));
3257 n = isALNUM_LC_utf8((U8*)locinput);
3261 ln = (locinput != PL_bostr) ?
3262 UCHARAT(locinput - 1) : '\n';
3263 if (OP(scan) == BOUND || OP(scan) == NBOUND) {
3265 n = isALNUM(nextchr);
3268 ln = isALNUM_LC(ln);
3269 n = isALNUM_LC(nextchr);
3272 if (((!ln) == (!n)) == (OP(scan) == BOUND ||
3273 OP(scan) == BOUNDL))
3277 PL_reg_flags |= RF_tainted;
3283 if (UTF8_IS_CONTINUED(nextchr)) {
3284 LOAD_UTF8_CHARCLASS_SPACE();
3285 if (!(OP(scan) == SPACE
3286 ? (bool)swash_fetch(PL_utf8_space, (U8*)locinput, do_utf8)
3287 : isSPACE_LC_utf8((U8*)locinput)))
3291 locinput += PL_utf8skip[nextchr];
3292 nextchr = UCHARAT(locinput);
3295 if (!(OP(scan) == SPACE
3296 ? isSPACE(nextchr) : isSPACE_LC(nextchr)))
3298 nextchr = UCHARAT(++locinput);
3301 if (!(OP(scan) == SPACE
3302 ? isSPACE(nextchr) : isSPACE_LC(nextchr)))
3304 nextchr = UCHARAT(++locinput);
3308 PL_reg_flags |= RF_tainted;
3311 if (!nextchr && locinput >= PL_regeol)
3314 LOAD_UTF8_CHARCLASS_SPACE();
3315 if (OP(scan) == NSPACE
3316 ? (bool)swash_fetch(PL_utf8_space, (U8*)locinput, do_utf8)
3317 : isSPACE_LC_utf8((U8*)locinput))
3321 locinput += PL_utf8skip[nextchr];
3322 nextchr = UCHARAT(locinput);
3325 if (OP(scan) == NSPACE
3326 ? isSPACE(nextchr) : isSPACE_LC(nextchr))
3328 nextchr = UCHARAT(++locinput);
3331 PL_reg_flags |= RF_tainted;
3337 LOAD_UTF8_CHARCLASS_DIGIT();
3338 if (!(OP(scan) == DIGIT
3339 ? (bool)swash_fetch(PL_utf8_digit, (U8*)locinput, do_utf8)
3340 : isDIGIT_LC_utf8((U8*)locinput)))
3344 locinput += PL_utf8skip[nextchr];
3345 nextchr = UCHARAT(locinput);
3348 if (!(OP(scan) == DIGIT
3349 ? isDIGIT(nextchr) : isDIGIT_LC(nextchr)))
3351 nextchr = UCHARAT(++locinput);
3354 PL_reg_flags |= RF_tainted;
3357 if (!nextchr && locinput >= PL_regeol)
3360 LOAD_UTF8_CHARCLASS_DIGIT();
3361 if (OP(scan) == NDIGIT
3362 ? (bool)swash_fetch(PL_utf8_digit, (U8*)locinput, do_utf8)
3363 : isDIGIT_LC_utf8((U8*)locinput))
3367 locinput += PL_utf8skip[nextchr];
3368 nextchr = UCHARAT(locinput);
3371 if (OP(scan) == NDIGIT
3372 ? isDIGIT(nextchr) : isDIGIT_LC(nextchr))
3374 nextchr = UCHARAT(++locinput);
3377 if (locinput >= PL_regeol)
3380 LOAD_UTF8_CHARCLASS_MARK();
3381 if (swash_fetch(PL_utf8_mark,(U8*)locinput, do_utf8))
3383 locinput += PL_utf8skip[nextchr];
3384 while (locinput < PL_regeol &&
3385 swash_fetch(PL_utf8_mark,(U8*)locinput, do_utf8))
3386 locinput += UTF8SKIP(locinput);
3387 if (locinput > PL_regeol)
3392 nextchr = UCHARAT(locinput);
3399 PL_reg_flags |= RF_tainted;
3404 n = reg_check_named_buff_matched(rex,scan);
3407 type = REF + ( type - NREF );
3414 PL_reg_flags |= RF_tainted;
3418 n = ARG(scan); /* which paren pair */
3421 ln = PL_regstartp[n];
3422 PL_reg_leftiter = PL_reg_maxiter; /* Void cache */
3423 if (*PL_reglastparen < n || ln == -1)
3424 sayNO; /* Do not match unless seen CLOSEn. */
3425 if (ln == PL_regendp[n])
3429 if (do_utf8 && type != REF) { /* REF can do byte comparison */
3431 const char *e = PL_bostr + PL_regendp[n];
3433 * Note that we can't do the "other character" lookup trick as
3434 * in the 8-bit case (no pun intended) because in Unicode we
3435 * have to map both upper and title case to lower case.
3439 STRLEN ulen1, ulen2;
3440 U8 tmpbuf1[UTF8_MAXBYTES_CASE+1];
3441 U8 tmpbuf2[UTF8_MAXBYTES_CASE+1];
3445 toLOWER_utf8((U8*)s, tmpbuf1, &ulen1);
3446 toLOWER_utf8((U8*)l, tmpbuf2, &ulen2);
3447 if (ulen1 != ulen2 || memNE((char *)tmpbuf1, (char *)tmpbuf2, ulen1))
3454 nextchr = UCHARAT(locinput);
3458 /* Inline the first character, for speed. */
3459 if (UCHARAT(s) != nextchr &&
3461 (UCHARAT(s) != (type == REFF
3462 ? PL_fold : PL_fold_locale)[nextchr])))
3464 ln = PL_regendp[n] - ln;
3465 if (locinput + ln > PL_regeol)
3467 if (ln > 1 && (type == REF
3468 ? memNE(s, locinput, ln)
3470 ? ibcmp(s, locinput, ln)
3471 : ibcmp_locale(s, locinput, ln))))
3474 nextchr = UCHARAT(locinput);
3484 #define ST st->u.eval
3488 regnode *startpoint;
3491 case GOSUB: /* /(...(?1))/ */
3492 if (cur_eval && cur_eval->locinput==locinput) {
3493 if (cur_eval->u.eval.close_paren == (U32)ARG(scan))
3494 Perl_croak(aTHX_ "Infinite recursion in regex");
3495 if ( ++nochange_depth > MAX_RECURSE_EVAL_NOCHANGE_DEPTH )
3497 "Pattern subroutine nesting without pos change"
3498 " exceeded limit in regex");
3503 (void)ReREFCNT_inc(rex);
3504 if (OP(scan)==GOSUB) {
3505 startpoint = scan + ARG2L(scan);
3506 ST.close_paren = ARG(scan);
3508 startpoint = re->program+1;
3511 goto eval_recurse_doit;
3513 case EVAL: /* /(?{A})B/ /(??{A})B/ and /(?(?{A})X|Y)B/ */
3514 if (cur_eval && cur_eval->locinput==locinput) {
3515 if ( ++nochange_depth > MAX_RECURSE_EVAL_NOCHANGE_DEPTH )
3516 Perl_croak(aTHX_ "EVAL without pos change exceeded limit in regex");
3521 /* execute the code in the {...} */
3523 SV ** const before = SP;
3524 OP_4tree * const oop = PL_op;
3525 COP * const ocurcop = PL_curcop;
3529 PL_op = (OP_4tree*)rex->data->data[n];
3530 DEBUG_STATE_r( PerlIO_printf(Perl_debug_log,
3531 " re_eval 0x%"UVxf"\n", PTR2UV(PL_op)) );
3532 PAD_SAVE_LOCAL(old_comppad, (PAD*)rex->data->data[n + 2]);
3533 PL_regendp[0] = PL_reg_magic->mg_len = locinput - PL_bostr;
3535 CALLRUNOPS(aTHX); /* Scalar context. */
3538 ret = &PL_sv_undef; /* protect against empty (?{}) blocks. */
3545 PAD_RESTORE_LOCAL(old_comppad);
3546 PL_curcop = ocurcop;
3549 sv_setsv(save_scalar(PL_replgv), ret);
3553 if (logical == 2) { /* Postponed subexpression: /(??{...})/ */
3556 /* extract RE object from returned value; compiling if
3561 if(SvROK(ret) && SvSMAGICAL(sv = SvRV(ret)))
3562 mg = mg_find(sv, PERL_MAGIC_qr);
3563 else if (SvSMAGICAL(ret)) {
3564 if (SvGMAGICAL(ret))
3565 sv_unmagic(ret, PERL_MAGIC_qr);
3567 mg = mg_find(ret, PERL_MAGIC_qr);
3571 re = (regexp *)mg->mg_obj;
3572 (void)ReREFCNT_inc(re);
3576 const char * const t = SvPV_const(ret, len);
3578 const I32 osize = PL_regsize;
3581 if (DO_UTF8(ret)) pm.op_pmdynflags |= PMdf_DYN_UTF8;
3582 re = CALLREGCOMP((char*)t, (char*)t + len, &pm);
3584 & (SVs_TEMP | SVs_PADTMP | SVf_READONLY
3586 sv_magic(ret,(SV*)ReREFCNT_inc(re),
3592 debug_start_match(re, do_utf8, locinput, PL_regeol,
3593 "Matching embedded");
3595 startpoint = re->program + 1;
3596 ST.close_paren = 0; /* only used for GOSUB */
3597 /* borrowed from regtry */
3598 if (PL_reg_start_tmpl <= re->nparens) {
3599 PL_reg_start_tmpl = re->nparens*3/2 + 3;
3600 if(PL_reg_start_tmp)
3601 Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*);
3603 Newx(PL_reg_start_tmp, PL_reg_start_tmpl, char*);
3606 eval_recurse_doit: /* Share code with GOSUB below this line */
3607 /* run the pattern returned from (??{...}) */
3608 ST.cp = regcppush(0); /* Save *all* the positions. */
3609 REGCP_SET(ST.lastcp);
3611 PL_regstartp = re->startp; /* essentially NOOP on GOSUB */
3612 PL_regendp = re->endp; /* essentially NOOP on GOSUB */
3614 *PL_reglastparen = 0;
3615 *PL_reglastcloseparen = 0;
3616 PL_reginput = locinput;
3619 /* XXXX This is too dramatic a measure... */
3622 ST.toggle_reg_flags = PL_reg_flags;
3623 if (re->reganch & ROPT_UTF8)
3624 PL_reg_flags |= RF_utf8;
3626 PL_reg_flags &= ~RF_utf8;
3627 ST.toggle_reg_flags ^= PL_reg_flags; /* diff of old and new */
3630 ST.prev_curlyx = cur_curlyx;
3634 ST.prev_eval = cur_eval;
3636 /* now continue from first node in postoned RE */
3637 PUSH_YES_STATE_GOTO(EVAL_AB, startpoint);
3640 /* logical is 1, /(?(?{...})X|Y)/ */
3641 sw = (bool)SvTRUE(ret);
3646 case EVAL_AB: /* cleanup after a successful (??{A})B */
3647 /* note: this is called twice; first after popping B, then A */
3648 PL_reg_flags ^= ST.toggle_reg_flags;
3652 cur_eval = ST.prev_eval;
3653 cur_curlyx = ST.prev_curlyx;
3654 /* XXXX This is too dramatic a measure... */
3659 case EVAL_AB_fail: /* unsuccessfully ran A or B in (??{A})B */
3660 /* note: this is called twice; first after popping B, then A */
3661 PL_reg_flags ^= ST.toggle_reg_flags;
3664 PL_reginput = locinput;
3665 REGCP_UNWIND(ST.lastcp);
3667 cur_eval = ST.prev_eval;
3668 cur_curlyx = ST.prev_curlyx;
3669 /* XXXX This is too dramatic a measure... */
3675 n = ARG(scan); /* which paren pair */
3676 PL_reg_start_tmp[n] = locinput;
3682 n = ARG(scan); /* which paren pair */
3683 PL_regstartp[n] = PL_reg_start_tmp[n] - PL_bostr;
3684 PL_regendp[n] = locinput - PL_bostr;
3685 /*if (n > PL_regsize)
3687 if (n > *PL_reglastparen)
3688 *PL_reglastparen = n;
3689 *PL_reglastcloseparen = n;
3690 if (cur_eval && cur_eval->u.eval.close_paren == n) {
3698 cursor && OP(cursor)!=END;
3699 cursor=regnext(cursor))
3701 if ( OP(cursor)==CLOSE ){
3703 if ( n <= lastopen ) {
3704 PL_regstartp[n] = PL_reg_start_tmp[n] - PL_bostr;
3705 PL_regendp[n] = locinput - PL_bostr;
3706 /*if (n > PL_regsize)
3708 if (n > *PL_reglastparen)
3709 *PL_reglastparen = n;
3710 *PL_reglastcloseparen = n;
3711 if ( n == ARG(scan) || (cur_eval &&
3712 cur_eval->u.eval.close_paren == n))
3721 n = ARG(scan); /* which paren pair */
3722 sw = (bool)(*PL_reglastparen >= n && PL_regendp[n] != -1);
3725 /* reg_check_named_buff_matched returns 0 for no match */
3726 sw = (bool)(0 < reg_check_named_buff_matched(rex,scan));
3730 sw = (cur_eval && (!n || cur_eval->u.eval.close_paren == n));
3736 PL_reg_leftiter = PL_reg_maxiter; /* Void cache */
3738 next = NEXTOPER(NEXTOPER(scan));
3740 next = scan + ARG(scan);
3741 if (OP(next) == IFTHEN) /* Fake one. */
3742 next = NEXTOPER(NEXTOPER(next));
3746 logical = scan->flags;
3749 /*******************************************************************
3751 The CURLYX/WHILEM pair of ops handle the most generic case of the /A*B/
3752 pattern, where A and B are subpatterns. (For simple A, CURLYM or
3753 STAR/PLUS/CURLY/CURLYN are used instead.)
3755 A*B is compiled as <CURLYX><A><WHILEM><B>
3757 On entry to the subpattern, CURLYX is called. This pushes a CURLYX
3758 state, which contains the current count, initialised to -1. It also sets
3759 cur_curlyx to point to this state, with any previous value saved in the
3762 CURLYX then jumps straight to the WHILEM op, rather than executing A,
3763 since the pattern may possibly match zero times (i.e. it's a while {} loop
3764 rather than a do {} while loop).
3766 Each entry to WHILEM represents a successful match of A. The count in the
3767 CURLYX block is incremented, another WHILEM state is pushed, and execution
3768 passes to A or B depending on greediness and the current count.
3770 For example, if matching against the string a1a2a3b (where the aN are
3771 substrings that match /A/), then the match progresses as follows: (the
3772 pushed states are interspersed with the bits of strings matched so far):
3775 <CURLYX cnt=0><WHILEM>
3776 <CURLYX cnt=1><WHILEM> a1 <WHILEM>
3777 <CURLYX cnt=2><WHILEM> a1 <WHILEM> a2 <WHILEM>
3778 <CURLYX cnt=3><WHILEM> a1 <WHILEM> a2 <WHILEM> a3 <WHILEM>
3779 <CURLYX cnt=3><WHILEM> a1 <WHILEM> a2 <WHILEM> a3 <WHILEM> b
3781 (Contrast this with something like CURLYM, which maintains only a single
3785 a1 <CURLYM cnt=1> a2
3786 a1 a2 <CURLYM cnt=2> a3
3787 a1 a2 a3 <CURLYM cnt=3> b
3790 Each WHILEM state block marks a point to backtrack to upon partial failure
3791 of A or B, and also contains some minor state data related to that
3792 iteration. The CURLYX block, pointed to by cur_curlyx, contains the
3793 overall state, such as the count, and pointers to the A and B ops.
3795 This is complicated slightly by nested CURLYX/WHILEM's. Since cur_curlyx
3796 must always point to the *current* CURLYX block, the rules are:
3798 When executing CURLYX, save the old cur_curlyx in the CURLYX state block,
3799 and set cur_curlyx to point the new block.
3801 When popping the CURLYX block after a successful or unsuccessful match,
3802 restore the previous cur_curlyx.
3804 When WHILEM is about to execute B, save the current cur_curlyx, and set it
3805 to the outer one saved in the CURLYX block.
3807 When popping the WHILEM block after a successful or unsuccessful B match,
3808 restore the previous cur_curlyx.
3810 Here's an example for the pattern (AI* BI)*BO
3811 I and O refer to inner and outer, C and W refer to CURLYX and WHILEM:
3814 curlyx backtrack stack
3815 ------ ---------------
3817 CO <CO prev=NULL> <WO>
3818 CI <CO prev=NULL> <WO> <CI prev=CO> <WI> ai
3819 CO <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi
3820 NULL <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi <WO prev=CO> bo
3822 At this point the pattern succeeds, and we work back down the stack to
3823 clean up, restoring as we go:
3825 CO <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi
3826 CI <CO prev=NULL> <WO> <CI prev=CO> <WI> ai
3827 CO <CO prev=NULL> <WO>
3830 *******************************************************************/
3832 #define ST st->u.curlyx
3834 case CURLYX: /* start of /A*B/ (for complex A) */
3836 /* No need to save/restore up to this paren */
3837 I32 parenfloor = scan->flags;
3839 assert(next); /* keep Coverity happy */
3840 if (OP(PREVOPER(next)) == NOTHING) /* LONGJMP */
3843 /* XXXX Probably it is better to teach regpush to support
3844 parenfloor > PL_regsize... */
3845 if (parenfloor > (I32)*PL_reglastparen)
3846 parenfloor = *PL_reglastparen; /* Pessimization... */
3848 ST.prev_curlyx= cur_curlyx;
3850 ST.cp = PL_savestack_ix;
3852 /* these fields contain the state of the current curly.
3853 * they are accessed by subsequent WHILEMs */
3854 ST.parenfloor = parenfloor;
3855 ST.min = ARG1(scan);
3856 ST.max = ARG2(scan);
3857 ST.A = NEXTOPER(scan) + EXTRA_STEP_2ARGS;
3861 ST.count = -1; /* this will be updated by WHILEM */
3862 ST.lastloc = NULL; /* this will be updated by WHILEM */
3864 PL_reginput = locinput;
3865 PUSH_YES_STATE_GOTO(CURLYX_end, PREVOPER(next));
3869 case CURLYX_end: /* just finished matching all of A*B */
3871 cur_curlyx = ST.prev_curlyx;
3875 case CURLYX_end_fail: /* just failed to match all of A*B */
3877 cur_curlyx = ST.prev_curlyx;
3883 #define ST st->u.whilem
3885 case WHILEM: /* just matched an A in /A*B/ (for complex A) */
3887 /* see the discussion above about CURLYX/WHILEM */
3889 assert(cur_curlyx); /* keep Coverity happy */
3890 n = ++cur_curlyx->u.curlyx.count; /* how many A's matched */
3891 ST.save_lastloc = cur_curlyx->u.curlyx.lastloc;
3892 ST.cache_offset = 0;
3895 PL_reginput = locinput;
3897 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
3898 "%*s whilem: matched %ld out of %ld..%ld\n",
3899 REPORT_CODE_OFF+depth*2, "", (long)n,
3900 (long)cur_curlyx->u.curlyx.min,
3901 (long)cur_curlyx->u.curlyx.max)
3904 /* First just match a string of min A's. */
3906 if (n < cur_curlyx->u.curlyx.min) {
3907 cur_curlyx->u.curlyx.lastloc = locinput;
3908 PUSH_STATE_GOTO(WHILEM_A_pre, cur_curlyx->u.curlyx.A);
3912 /* If degenerate A matches "", assume A done. */
3914 if (locinput == cur_curlyx->u.curlyx.lastloc) {
3915 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
3916 "%*s whilem: empty match detected, trying continuation...\n",
3917 REPORT_CODE_OFF+depth*2, "")
3919 goto do_whilem_B_max;
3922 /* super-linear cache processing */
3926 if (!PL_reg_maxiter) {
3927 /* start the countdown: Postpone detection until we
3928 * know the match is not *that* much linear. */
3929 PL_reg_maxiter = (PL_regeol - PL_bostr + 1) * (scan->flags>>4);
3930 /* possible overflow for long strings and many CURLYX's */
3931 if (PL_reg_maxiter < 0)
3932 PL_reg_maxiter = I32_MAX;
3933 PL_reg_leftiter = PL_reg_maxiter;
3936 if (PL_reg_leftiter-- == 0) {
3937 /* initialise cache */
3938 const I32 size = (PL_reg_maxiter + 7)/8;
3939 if (PL_reg_poscache) {
3940 if ((I32)PL_reg_poscache_size < size) {
3941 Renew(PL_reg_poscache, size, char);
3942 PL_reg_poscache_size = size;
3944 Zero(PL_reg_poscache, size, char);
3947 PL_reg_poscache_size = size;
3948 Newxz(PL_reg_poscache, size, char);
3950 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
3951 "%swhilem: Detected a super-linear match, switching on caching%s...\n",
3952 PL_colors[4], PL_colors[5])
3956 if (PL_reg_leftiter < 0) {
3957 /* have we already failed at this position? */
3959 offset = (scan->flags & 0xf) - 1
3960 + (locinput - PL_bostr) * (scan->flags>>4);
3961 mask = 1 << (offset % 8);
3963 if (PL_reg_poscache[offset] & mask) {
3964 DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
3965 "%*s whilem: (cache) already tried at this position...\n",
3966 REPORT_CODE_OFF+depth*2, "")
3968 sayNO; /* cache records failure */
3970 ST.cache_offset = offset;
3971 ST.cache_mask = mask;
3975 /* Prefer B over A for minimal matching. */
3977 if (cur_curlyx->u.curlyx.minmod) {
3978 ST.save_curlyx = cur_curlyx;
3979 cur_curlyx = cur_curlyx->u.curlyx.prev_curlyx;
3980 ST.cp = regcppush(ST.save_curlyx->u.curlyx.parenfloor);
3981 REGCP_SET(ST.lastcp);
3982 PUSH_YES_STATE_GOTO(WHILEM_B_min, ST.save_curlyx->u.curlyx.B);
3986 /* Prefer A over B for maximal matching. */
3988 if (n < cur_curlyx->u.curlyx.max) { /* More greed allowed? */
3989 ST.cp = regcppush(cur_curlyx->u.curlyx.parenfloor);
3990 cur_curlyx->u.curlyx.lastloc = locinput;
3991 REGCP_SET(ST.lastcp);
3992 PUSH_STATE_GOTO(WHILEM_A_max, cur_curlyx->u.curlyx.A);
3995 goto do_whilem_B_max;
3999 case WHILEM_B_min: /* just matched B in a minimal match */
4000 case WHILEM_B_max: /* just matched B in a maximal match */
4001 cur_curlyx = ST.save_curlyx;
4005 case WHILEM_B_max_fail: /* just failed to match B in a maximal match */
4006 cur_curlyx = ST.save_curlyx;
4007 cur_curlyx->u.curlyx.lastloc = ST.save_lastloc;
4008 cur_curlyx->u.curlyx.count--;
4012 case WHILEM_A_min_fail: /* just failed to match A in a minimal match */
4013 REGCP_UNWIND(ST.lastcp);
4016 case WHILEM_A_pre_fail: /* just failed to match even minimal A */
4017 cur_curlyx->u.curlyx.lastloc = ST.save_lastloc;
4018 cur_curlyx->u.curlyx.count--;
4022 case WHILEM_A_max_fail: /* just failed to match A in a maximal match */
4023 REGCP_UNWIND(ST.lastcp);
4024 regcppop(rex); /* Restore some previous $<digit>s? */
4025 PL_reginput = locinput;
4026 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
4027 "%*s whilem: failed, trying continuation...\n",
4028 REPORT_CODE_OFF+depth*2, "")
4031 if (cur_curlyx->u.curlyx.count >= REG_INFTY
4032 && ckWARN(WARN_REGEXP)
4033 && !(PL_reg_flags & RF_warned))
4035 PL_reg_flags |= RF_warned;
4036 Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s limit (%d) exceeded",
4037 "Complex regular subexpression recursion",
4042 ST.save_curlyx = cur_curlyx;
4043 cur_curlyx = cur_curlyx->u.curlyx.prev_curlyx;
4044 PUSH_YES_STATE_GOTO(WHILEM_B_max, ST.save_curlyx->u.curlyx.B);
4047 case WHILEM_B_min_fail: /* just failed to match B in a minimal match */
4048 cur_curlyx = ST.save_curlyx;
4049 REGCP_UNWIND(ST.lastcp);
4052 if (cur_curlyx->u.curlyx.count >= cur_curlyx->u.curlyx.max) {
4053 /* Maximum greed exceeded */
4054 if (cur_curlyx->u.curlyx.count >= REG_INFTY
4055 && ckWARN(WARN_REGEXP)
4056 && !(PL_reg_flags & RF_warned))
4058 PL_reg_flags |= RF_warned;
4059 Perl_warner(aTHX_ packWARN(WARN_REGEXP),
4060 "%s limit (%d) exceeded",
4061 "Complex regular subexpression recursion",
4064 cur_curlyx->u.curlyx.count--;
4068 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
4069 "%*s trying longer...\n", REPORT_CODE_OFF+depth*2, "")
4071 /* Try grabbing another A and see if it helps. */
4072 PL_reginput = locinput;
4073 cur_curlyx->u.curlyx.lastloc = locinput;
4074 ST.cp = regcppush(cur_curlyx->u.curlyx.parenfloor);
4075 REGCP_SET(ST.lastcp);
4076 PUSH_STATE_GOTO(WHILEM_A_min, ST.save_curlyx->u.curlyx.A);
4080 #define ST st->u.branch
4082 case BRANCHJ: /* /(...|A|...)/ with long next pointer */
4083 next = scan + ARG(scan);
4086 scan = NEXTOPER(scan);
4089 case BRANCH: /* /(...|A|...)/ */
4090 scan = NEXTOPER(scan); /* scan now points to inner node */
4091 if ((!next || (OP(next) != BRANCH && OP(next) != BRANCHJ))
4094 /* last branch; skip state push and jump direct to node */
4097 ST.lastparen = *PL_reglastparen;
4098 ST.next_branch = next;
4100 PL_reginput = locinput;
4102 /* Now go into the branch */
4104 PUSH_YES_STATE_GOTO(BRANCH_next, scan);
4106 PUSH_STATE_GOTO(BRANCH_next, scan);
4110 PL_reginput = locinput;
4111 sv_yes_mark = st->u.mark.mark_name = scan->flags ? NULL :
4112 (SV*)rex->data->data[ ARG( scan ) ];
4113 PUSH_STATE_GOTO(CUTGROUP_next,next);
4115 case CUTGROUP_next_fail:
4118 if (st->u.mark.mark_name)
4119 sv_commit = st->u.mark.mark_name;
4125 case BRANCH_next_fail: /* that branch failed; try the next, if any */
4130 REGCP_UNWIND(ST.cp);
4131 for (n = *PL_reglastparen; n > ST.lastparen; n--)
4133 *PL_reglastparen = n;
4134 /*dmq: *PL_reglastcloseparen = n; */
4135 scan = ST.next_branch;
4136 /* no more branches? */
4137 if (!scan || (OP(scan) != BRANCH && OP(scan) != BRANCHJ)) {
4139 PerlIO_printf( Perl_debug_log,
4140 "%*s %sBRANCH failed...%s\n",
4141 REPORT_CODE_OFF+depth*2, "",
4147 continue; /* execute next BRANCH[J] op */
4155 #define ST st->u.curlym
4157 case CURLYM: /* /A{m,n}B/ where A is fixed-length */
4159 /* This is an optimisation of CURLYX that enables us to push
4160 * only a single backtracking state, no matter now many matches
4161 * there are in {m,n}. It relies on the pattern being constant
4162 * length, with no parens to influence future backrefs
4166 scan = NEXTOPER(scan) + NODE_STEP_REGNODE;
4168 /* if paren positive, emulate an OPEN/CLOSE around A */
4170 U32 paren = ST.me->flags;
4171 if (paren > PL_regsize)
4173 if (paren > *PL_reglastparen)
4174 *PL_reglastparen = paren;
4175 scan += NEXT_OFF(scan); /* Skip former OPEN. */
4183 ST.c1 = CHRTEST_UNINIT;
4186 if (!(ST.minmod ? ARG1(ST.me) : ARG2(ST.me))) /* min/max */
4189 curlym_do_A: /* execute the A in /A{m,n}B/ */
4190 PL_reginput = locinput;
4191 PUSH_YES_STATE_GOTO(CURLYM_A, ST.A); /* match A */
4194 case CURLYM_A: /* we've just matched an A */
4195 locinput = st->locinput;
4196 nextchr = UCHARAT(locinput);
4199 /* after first match, determine A's length: u.curlym.alen */
4200 if (ST.count == 1) {
4201 if (PL_reg_match_utf8) {
4203 while (s < PL_reginput) {
4209 ST.alen = PL_reginput - locinput;
4212 ST.count = ST.minmod ? ARG1(ST.me) : ARG2(ST.me);
4215 PerlIO_printf(Perl_debug_log,
4216 "%*s CURLYM now matched %"IVdf" times, len=%"IVdf"...\n",
4217 (int)(REPORT_CODE_OFF+(depth*2)), "",
4218 (IV) ST.count, (IV)ST.alen)
4221 locinput = PL_reginput;
4223 if (cur_eval && cur_eval->u.eval.close_paren &&
4224 cur_eval->u.eval.close_paren == (U32)ST.me->flags)
4227 if ( ST.count < (ST.minmod ? ARG1(ST.me) : ARG2(ST.me)) )
4228 goto curlym_do_A; /* try to match another A */
4229 goto curlym_do_B; /* try to match B */
4231 case CURLYM_A_fail: /* just failed to match an A */
4232 REGCP_UNWIND(ST.cp);
4234 if (ST.minmod || ST.count < ARG1(ST.me) /* min*/
4235 || (cur_eval && cur_eval->u.eval.close_paren &&
4236 cur_eval->u.eval.close_paren == (U32)ST.me->flags))
4239 curlym_do_B: /* execute the B in /A{m,n}B/ */
4240 PL_reginput = locinput;
4241 if (ST.c1 == CHRTEST_UNINIT) {
4242 /* calculate c1 and c2 for possible match of 1st char
4243 * following curly */
4244 ST.c1 = ST.c2 = CHRTEST_VOID;
4245 if (HAS_TEXT(ST.B) || JUMPABLE(ST.B)) {
4246 regnode *text_node = ST.B;
4247 if (! HAS_TEXT(text_node))
4248 FIND_NEXT_IMPT(text_node);
4249 if (HAS_TEXT(text_node)
4250 && PL_regkind[OP(text_node)] != REF)
4252 ST.c1 = (U8)*STRING(text_node);
4254 (OP(text_node) == EXACTF || OP(text_node) == REFF)
4256 : (OP(text_node) == EXACTFL || OP(text_node) == REFFL)
4257 ? PL_fold_locale[ST.c1]
4264 PerlIO_printf(Perl_debug_log,
4265 "%*s CURLYM trying tail with matches=%"IVdf"...\n",
4266 (int)(REPORT_CODE_OFF+(depth*2)),
4269 if (ST.c1 != CHRTEST_VOID
4270 && UCHARAT(PL_reginput) != ST.c1
4271 && UCHARAT(PL_reginput) != ST.c2)
4273 /* simulate B failing */
4274 state_num = CURLYM_B_fail;
4275 goto reenter_switch;
4279 /* mark current A as captured */
4280 I32 paren = ST.me->flags;
4283 = HOPc(PL_reginput, -ST.alen) - PL_bostr;
4284 PL_regendp[paren] = PL_reginput - PL_bostr;
4285 /*dmq: *PL_reglastcloseparen = paren; */
4288 PL_regendp[paren] = -1;
4289 if (cur_eval && cur_eval->u.eval.close_paren &&
4290 cur_eval->u.eval.close_paren == (U32)ST.me->flags)
4299 PUSH_STATE_GOTO(CURLYM_B, ST.B); /* match B */
4302 case CURLYM_B_fail: /* just failed to match a B */
4303 REGCP_UNWIND(ST.cp);
4305 if (ST.count == ARG2(ST.me) /* max */)
4307 goto curlym_do_A; /* try to match a further A */
4309 /* backtrack one A */
4310 if (ST.count == ARG1(ST.me) /* min */)
4313 locinput = HOPc(locinput, -ST.alen);
4314 goto curlym_do_B; /* try to match B */
4317 #define ST st->u.curly
4319 #define CURLY_SETPAREN(paren, success) \
4322 PL_regstartp[paren] = HOPc(locinput, -1) - PL_bostr; \
4323 PL_regendp[paren] = locinput - PL_bostr; \
4324 *PL_reglastcloseparen = paren; \
4327 PL_regendp[paren] = -1; \
4330 case STAR: /* /A*B/ where A is width 1 */
4334 scan = NEXTOPER(scan);
4336 case PLUS: /* /A+B/ where A is width 1 */
4340 scan = NEXTOPER(scan);
4342 case CURLYN: /* /(A){m,n}B/ where A is width 1 */
4343 ST.paren = scan->flags; /* Which paren to set */
4344 if (ST.paren > PL_regsize)
4345 PL_regsize = ST.paren;
4346 if (ST.paren > *PL_reglastparen)
4347 *PL_reglastparen = ST.paren;
4348 ST.min = ARG1(scan); /* min to match */
4349 ST.max = ARG2(scan); /* max to match */
4350 if (cur_eval && cur_eval->u.eval.close_paren &&
4351 cur_eval->u.eval.close_paren == (U32)ST.paren) {
4355 scan = regnext(NEXTOPER(scan) + NODE_STEP_REGNODE);
4357 case CURLY: /* /A{m,n}B/ where A is width 1 */
4359 ST.min = ARG1(scan); /* min to match */
4360 ST.max = ARG2(scan); /* max to match */
4361 scan = NEXTOPER(scan) + NODE_STEP_REGNODE;
4364 * Lookahead to avoid useless match attempts
4365 * when we know what character comes next.
4367 * Used to only do .*x and .*?x, but now it allows
4368 * for )'s, ('s and (?{ ... })'s to be in the way
4369 * of the quantifier and the EXACT-like node. -- japhy
4372 if (ST.min > ST.max) /* XXX make this a compile-time check? */
4374 if (HAS_TEXT(next) || JUMPABLE(next)) {
4376 regnode *text_node = next;
4378 if (! HAS_TEXT(text_node))
4379 FIND_NEXT_IMPT(text_node);
4381 if (! HAS_TEXT(text_node))
4382 ST.c1 = ST.c2 = CHRTEST_VOID;
4384 if (PL_regkind[OP(text_node)] == REF) {
4385 ST.c1 = ST.c2 = CHRTEST_VOID;
4386 goto assume_ok_easy;
4389 s = (U8*)STRING(text_node);
4393 if (OP(text_node) == EXACTF || OP(text_node) == REFF)
4394 ST.c2 = PL_fold[ST.c1];
4395 else if (OP(text_node) == EXACTFL || OP(text_node) == REFFL)
4396 ST.c2 = PL_fold_locale[ST.c1];
4399 if (OP(text_node) == EXACTF || OP(text_node) == REFF) {
4400 STRLEN ulen1, ulen2;
4401 U8 tmpbuf1[UTF8_MAXBYTES_CASE+1];
4402 U8 tmpbuf2[UTF8_MAXBYTES_CASE+1];
4404 to_utf8_lower((U8*)s, tmpbuf1, &ulen1);
4405 to_utf8_upper((U8*)s, tmpbuf2, &ulen2);
4407 ST.c1 = utf8n_to_uvchr(tmpbuf1, UTF8_MAXLEN, 0,
4409 0 : UTF8_ALLOW_ANY);
4410 ST.c2 = utf8n_to_uvchr(tmpbuf2, UTF8_MAXLEN, 0,
4412 0 : UTF8_ALLOW_ANY);
4414 ST.c1 = utf8n_to_uvuni(tmpbuf1, UTF8_MAXBYTES, 0,
4416 ST.c2 = utf8n_to_uvuni(tmpbuf2, UTF8_MAXBYTES, 0,
4421 ST.c2 = ST.c1 = utf8n_to_uvchr(s, UTF8_MAXBYTES, 0,
4428 ST.c1 = ST.c2 = CHRTEST_VOID;
4433 PL_reginput = locinput;
4436 if (ST.min && regrepeat(rex, ST.A, ST.min, depth) < ST.min)
4439 locinput = PL_reginput;
4441 if (ST.c1 == CHRTEST_VOID)
4442 goto curly_try_B_min;
4444 ST.oldloc = locinput;
4446 /* set ST.maxpos to the furthest point along the
4447 * string that could possibly match */
4448 if (ST.max == REG_INFTY) {
4449 ST.maxpos = PL_regeol - 1;
4451 while (UTF8_IS_CONTINUATION(*(U8*)ST.maxpos))
4455 int m = ST.max - ST.min;
4456 for (ST.maxpos = locinput;
4457 m >0 && ST.maxpos + UTF8SKIP(ST.maxpos) <= PL_regeol; m--)
4458 ST.maxpos += UTF8SKIP(ST.maxpos);
4461 ST.maxpos = locinput + ST.max - ST.min;
4462 if (ST.maxpos >= PL_regeol)
4463 ST.maxpos = PL_regeol - 1;
4465 goto curly_try_B_min_known;
4469 ST.count = regrepeat(rex, ST.A, ST.max, depth);
4470 locinput = PL_reginput;
4471 if (ST.count < ST.min)
4473 if ((ST.count > ST.min)
4474 && (PL_regkind[OP(ST.B)] == EOL) && (OP(ST.B) != MEOL))
4476 /* A{m,n} must come at the end of the string, there's
4477 * no point in backing off ... */
4479 /* ...except that $ and \Z can match before *and* after
4480 newline at the end. Consider "\n\n" =~ /\n+\Z\n/.
4481 We may back off by one in this case. */
4482 if (UCHARAT(PL_reginput - 1) == '\n' && OP(ST.B) != EOS)
4486 goto curly_try_B_max;
4491 case CURLY_B_min_known_fail:
4492 /* failed to find B in a non-greedy match where c1,c2 valid */
4493 if (ST.paren && ST.count)
4494 PL_regendp[ST.paren] = -1;
4496 PL_reginput = locinput; /* Could be reset... */
4497 REGCP_UNWIND(ST.cp);
4498 /* Couldn't or didn't -- move forward. */
4499 ST.oldloc = locinput;
4501 locinput += UTF8SKIP(locinput);
4505 curly_try_B_min_known:
4506 /* find the next place where 'B' could work, then call B */
4510 n = (ST.oldloc == locinput) ? 0 : 1;
4511 if (ST.c1 == ST.c2) {
4513 /* set n to utf8_distance(oldloc, locinput) */
4514 while (locinput <= ST.maxpos &&
4515 utf8n_to_uvchr((U8*)locinput,
4516 UTF8_MAXBYTES, &len,
4517 uniflags) != (UV)ST.c1) {
4523 /* set n to utf8_distance(oldloc, locinput) */
4524 while (locinput <= ST.maxpos) {
4526 const UV c = utf8n_to_uvchr((U8*)locinput,
4527 UTF8_MAXBYTES, &len,
4529 if (c == (UV)ST.c1 || c == (UV)ST.c2)
4537 if (ST.c1 == ST.c2) {
4538 while (locinput <= ST.maxpos &&
4539 UCHARAT(locinput) != ST.c1)
4543 while (locinput <= ST.maxpos
4544 && UCHARAT(locinput) != ST.c1
4545 && UCHARAT(locinput) != ST.c2)
4548 n = locinput - ST.oldloc;
4550 if (locinput > ST.maxpos)
4552 /* PL_reginput == oldloc now */
4555 if (regrepeat(rex, ST.A, n, depth) < n)
4558 PL_reginput = locinput;
4559 CURLY_SETPAREN(ST.paren, ST.count);
4560 if (cur_eval && cur_eval->u.eval.close_paren &&
4561 cur_eval->u.eval.close_paren == (U32)ST.paren) {
4564 PUSH_STATE_GOTO(CURLY_B_min_known, ST.B);
4569 case CURLY_B_min_fail:
4570 /* failed to find B in a non-greedy match where c1,c2 invalid */
4571 if (ST.paren && ST.count)
4572 PL_regendp[ST.paren] = -1;
4574 REGCP_UNWIND(ST.cp);
4575 /* failed -- move forward one */
4576 PL_reginput = locinput;
4577 if (regrepeat(rex, ST.A, 1, depth)) {
4579 locinput = PL_reginput;
4580 if (ST.count <= ST.max || (ST.max == REG_INFTY &&
4581 ST.count > 0)) /* count overflow ? */
4584 CURLY_SETPAREN(ST.paren, ST.count);
4585 if (cur_eval && cur_eval->u.eval.close_paren &&
4586 cur_eval->u.eval.close_paren == (U32)ST.paren) {
4589 PUSH_STATE_GOTO(CURLY_B_min, ST.B);
4597 /* a successful greedy match: now try to match B */
4598 if (cur_eval && cur_eval->u.eval.close_paren &&
4599 cur_eval->u.eval.close_paren == (U32)ST.paren) {
4604 if (ST.c1 != CHRTEST_VOID)
4605 c = do_utf8 ? utf8n_to_uvchr((U8*)PL_reginput,
4606 UTF8_MAXBYTES, 0, uniflags)
4607 : (UV) UCHARAT(PL_reginput);
4608 /* If it could work, try it. */
4609 if (ST.c1 == CHRTEST_VOID || c == (UV)ST.c1 || c == (UV)ST.c2) {
4610 CURLY_SETPAREN(ST.paren, ST.count);
4611 PUSH_STATE_GOTO(CURLY_B_max, ST.B);
4616 case CURLY_B_max_fail:
4617 /* failed to find B in a greedy match */
4618 if (ST.paren && ST.count)
4619 PL_regendp[ST.paren] = -1;
4621 REGCP_UNWIND(ST.cp);
4623 if (--ST.count < ST.min)
4625 PL_reginput = locinput = HOPc(locinput, -1);
4626 goto curly_try_B_max;
4633 /* we've just finished A in /(??{A})B/; now continue with B */
4637 st->u.eval.toggle_reg_flags
4638 = cur_eval->u.eval.toggle_reg_flags;
4639 PL_reg_flags ^= st->u.eval.toggle_reg_flags;
4641 st->u.eval.prev_rex = rex; /* inner */
4642 rex = cur_eval->u.eval.prev_rex; /* outer */
4643 cur_curlyx = cur_eval->u.eval.prev_curlyx;
4645 st->u.eval.cp = regcppush(0); /* Save *all* the positions. */
4646 REGCP_SET(st->u.eval.lastcp);
4647 PL_reginput = locinput;
4649 /* Restore parens of the outer rex without popping the
4651 tmpix = PL_savestack_ix;
4652 PL_savestack_ix = cur_eval->u.eval.lastcp;
4654 PL_savestack_ix = tmpix;
4656 st->u.eval.prev_eval = cur_eval;
4657 cur_eval = cur_eval->u.eval.prev_eval;
4659 PerlIO_printf(Perl_debug_log, "%*s EVAL trying tail ... %"UVxf"\n",
4660 REPORT_CODE_OFF+depth*2, "",PTR2UV(cur_eval)););
4661 PUSH_YES_STATE_GOTO(EVAL_AB,
4662 st->u.eval.prev_eval->u.eval.B); /* match B */
4665 if (locinput < reginfo->till) {
4666 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
4667 "%sMatch possible, but length=%ld is smaller than requested=%ld, failing!%s\n",
4669 (long)(locinput - PL_reg_starttry),
4670 (long)(reginfo->till - PL_reg_starttry),
4672 sayNO_SILENT; /* Cannot match: too short. */
4674 PL_reginput = locinput; /* put where regtry can find it */
4675 sayYES; /* Success! */
4677 case SUCCEED: /* successful SUSPEND/UNLESSM/IFMATCH/CURLYM */
4679 PerlIO_printf(Perl_debug_log,
4680 "%*s %ssubpattern success...%s\n",
4681 REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5]));
4682 PL_reginput = locinput; /* put where regtry can find it */
4683 sayYES; /* Success! */
4686 #define ST st->u.ifmatch
4688 case SUSPEND: /* (?>A) */
4690 PL_reginput = locinput;
4693 case UNLESSM: /* -ve lookaround: (?!A), or with flags, (?<!A) */
4695 goto ifmatch_trivial_fail_test;
4697 case IFMATCH: /* +ve lookaround: (?=A), or with flags, (?<=A) */
4699 ifmatch_trivial_fail_test:
4701 char * const s = HOPBACKc(locinput, scan->flags);
4706 sw = 1 - (bool)ST.wanted;
4710 next = scan + ARG(scan);
4718 PL_reginput = locinput;
4722 ST.logical = logical;
4723 /* execute body of (?...A) */
4724 PUSH_YES_STATE_GOTO(IFMATCH_A, NEXTOPER(NEXTOPER(scan)));
4727 case IFMATCH_A_fail: /* body of (?...A) failed */
4728 ST.wanted = !ST.wanted;
4731 case IFMATCH_A: /* body of (?...A) succeeded */
4733 sw = (bool)ST.wanted;
4735 else if (!ST.wanted)
4738 if (OP(ST.me) == SUSPEND)
4739 locinput = PL_reginput;
4741 locinput = PL_reginput = st->locinput;
4742 nextchr = UCHARAT(locinput);
4744 scan = ST.me + ARG(ST.me);
4747 continue; /* execute B */
4752 next = scan + ARG(scan);
4757 reginfo->cutpoint = PL_regeol;
4760 PL_reginput = locinput;
4762 sv_yes_mark = sv_commit = (SV*)rex->data->data[ ARG( scan ) ];
4763 PUSH_STATE_GOTO(COMMIT_next,next);
4765 case COMMIT_next_fail:
4772 #define ST st->u.mark
4774 ST.prev_mark = mark_state;
4775 ST.mark_name = sv_commit = sv_yes_mark
4776 = (SV*)rex->data->data[ ARG( scan ) ];
4778 ST.mark_loc = PL_reginput = locinput;
4779 PUSH_YES_STATE_GOTO(MARKPOINT_next,next);
4781 case MARKPOINT_next:
4782 mark_state = ST.prev_mark;
4785 case MARKPOINT_next_fail:
4786 if (popmark && sv_eq(ST.mark_name,popmark))
4788 if (ST.mark_loc > startpoint)
4789 reginfo->cutpoint = HOPBACKc(ST.mark_loc, 1);
4790 popmark = NULL; /* we found our mark */
4791 sv_commit = ST.mark_name;
4794 PerlIO_printf(Perl_debug_log,
4795 "%*s %ssetting cutpoint to mark:%"SVf"...%s\n",
4796 REPORT_CODE_OFF+depth*2, "",
4797 PL_colors[4], sv_commit, PL_colors[5]);
4800 mark_state = ST.prev_mark;
4801 sv_yes_mark = mark_state ?
4802 mark_state->u.mark.mark_name : NULL;
4806 PL_reginput = locinput;
4808 /* (*CUT) : if we fail we cut here*/
4809 ST.mark_name = NULL;
4810 ST.mark_loc = locinput;
4811 PUSH_STATE_GOTO(SKIP_next,next);
4813 /* (*CUT:NAME) : if there is a (*MARK:NAME) fail where it was,
4814 otherwise do nothing. Meaning we need to scan
4816 regmatch_state *cur = mark_state;
4817 SV *find = (SV*)rex->data->data[ ARG( scan ) ];
4820 if ( sv_eq( cur->u.mark.mark_name,
4823 ST.mark_name = find;
4824 PUSH_STATE_GOTO( SKIP_next, next );
4826 cur = cur->u.mark.prev_mark;
4829 /* Didn't find our (*MARK:NAME) so ignore this (*CUT:NAME) */
4831 case SKIP_next_fail:
4833 /* (*CUT:NAME) - Set up to search for the name as we
4834 collapse the stack*/
4835 popmark = ST.mark_name;
4837 /* (*CUT) - No name, we cut here.*/
4838 if (ST.mark_loc > startpoint)
4839 reginfo->cutpoint = HOPBACKc(ST.mark_loc, 1);
4840 /* but we set sv_commit to latest mark_name if there
4841 is one so they can test to see how things lead to this
4844 sv_commit=mark_state->u.mark.mark_name;
4852 PerlIO_printf(Perl_error_log, "%"UVxf" %d\n",
4853 PTR2UV(scan), OP(scan));
4854 Perl_croak(aTHX_ "regexp memory corruption");
4858 /* switch break jumps here */
4859 scan = next; /* prepare to execute the next op and ... */
4860 continue; /* ... jump back to the top, reusing st */
4864 /* push a state that backtracks on success */
4865 st->u.yes.prev_yes_state = yes_state;
4869 /* push a new regex state, then continue at scan */
4871 regmatch_state *newst;
4874 regmatch_state *cur = st;
4875 regmatch_state *curyes = yes_state;
4877 regmatch_slab *slab = PL_regmatch_slab;
4878 for (;curd > -1;cur--,curd--) {
4879 if (cur < SLAB_FIRST(slab)) {
4881 cur = SLAB_LAST(slab);
4883 PerlIO_printf(Perl_error_log, "%*s#%-3d %-10s %s\n",
4884 REPORT_CODE_OFF + 2 + depth * 2,"",
4885 curd, reg_name[cur->resume_state],
4886 (curyes == cur) ? "yes" : ""
4889 curyes = cur->u.yes.prev_yes_state;
4892 DEBUG_STATE_pp("push")
4895 st->locinput = locinput;
4897 if (newst > SLAB_LAST(PL_regmatch_slab))
4898 newst = S_push_slab(aTHX);
4899 PL_regmatch_state = newst;
4901 locinput = PL_reginput;
4902 nextchr = UCHARAT(locinput);
4910 * We get here only if there's trouble -- normally "case END" is
4911 * the terminating point.
4913 Perl_croak(aTHX_ "corrupted regexp pointers");
4919 /* we have successfully completed a subexpression, but we must now
4920 * pop to the state marked by yes_state and continue from there */
4921 assert(st != yes_state);
4923 while (st != yes_state) {
4925 if (st < SLAB_FIRST(PL_regmatch_slab)) {
4926 PL_regmatch_slab = PL_regmatch_slab->prev;
4927 st = SLAB_LAST(PL_regmatch_slab);
4931 DEBUG_STATE_pp("pop (no final)");
4933 DEBUG_STATE_pp("pop (yes)");
4939 while (yes_state < SLAB_FIRST(PL_regmatch_slab)
4940 || yes_state > SLAB_LAST(PL_regmatch_slab))
4942 /* not in this slab, pop slab */
4943 depth -= (st - SLAB_FIRST(PL_regmatch_slab) + 1);
4944 PL_regmatch_slab = PL_regmatch_slab->prev;
4945 st = SLAB_LAST(PL_regmatch_slab);
4947 depth -= (st - yes_state);
4950 yes_state = st->u.yes.prev_yes_state;
4951 PL_regmatch_state = st;
4954 locinput= st->locinput;
4955 nextchr = UCHARAT(locinput);
4957 state_num = st->resume_state + no_final;
4958 goto reenter_switch;
4961 DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch successful!%s\n",
4962 PL_colors[4], PL_colors[5]));
4969 PerlIO_printf(Perl_debug_log,
4970 "%*s %sfailed...%s\n",
4971 REPORT_CODE_OFF+depth*2, "",
4972 PL_colors[4], PL_colors[5])
4984 /* there's a previous state to backtrack to */
4986 if (st < SLAB_FIRST(PL_regmatch_slab)) {
4987 PL_regmatch_slab = PL_regmatch_slab->prev;
4988 st = SLAB_LAST(PL_regmatch_slab);
4990 PL_regmatch_state = st;
4991 locinput= st->locinput;
4992 nextchr = UCHARAT(locinput);
4994 DEBUG_STATE_pp("pop");
4996 if (yes_state == st)
4997 yes_state = st->u.yes.prev_yes_state;
4999 state_num = st->resume_state + 1; /* failure = success + 1 */
5000 goto reenter_switch;
5005 if (rex->reganch & ROPT_VERBARG_SEEN) {
5006 SV *sv_err = get_sv("REGERROR", 1);
5007 SV *sv_mrk = get_sv("REGMARK", 1);
5009 sv_commit = &PL_sv_no;
5011 sv_yes_mark = &PL_sv_yes;
5014 sv_commit = &PL_sv_yes;
5015 sv_yes_mark = &PL_sv_no;
5017 sv_setsv(sv_err, sv_commit);
5018 sv_setsv(sv_mrk, sv_yes_mark);
5020 /* restore original high-water mark */
5021 PL_regmatch_slab = orig_slab;
5022 PL_regmatch_state = orig_state;
5024 /* free all slabs above current one */
5025 if (orig_slab->next) {
5026 regmatch_slab *sl = orig_slab->next;
5027 orig_slab->next = NULL;
5029 regmatch_slab * const osl = sl;
5039 - regrepeat - repeatedly match something simple, report how many
5042 * [This routine now assumes that it will only match on things of length 1.
5043 * That was true before, but now we assume scan - reginput is the count,
5044 * rather than incrementing count on every character. [Er, except utf8.]]
5047 S_regrepeat(pTHX_ const regexp *prog, const regnode *p, I32 max, int depth)
5050 register char *scan;
5052 register char *loceol = PL_regeol;
5053 register I32 hardcount = 0;
5054 register bool do_utf8 = PL_reg_match_utf8;
5057 if (max == REG_INFTY)
5059 else if (max < loceol - scan)
5060 loceol = scan + max;
5065 while (scan < loceol && hardcount < max && *scan != '\n') {
5066 scan += UTF8SKIP(scan);
5070 while (scan < loceol && *scan != '\n')
5077 while (scan < loceol && hardcount < max) {
5078 scan += UTF8SKIP(scan);
5088 case EXACT: /* length of string is 1 */
5090 while (scan < loceol && UCHARAT(scan) == c)
5093 case EXACTF: /* length of string is 1 */
5095 while (scan < loceol &&
5096 (UCHARAT(scan) == c || UCHARAT(scan) == PL_fold[c]))
5099 case EXACTFL: /* length of string is 1 */
5100 PL_reg_flags |= RF_tainted;
5102 while (scan < loceol &&
5103 (UCHARAT(scan) == c || UCHARAT(scan) == PL_fold_locale[c]))
5109 while (hardcount < max && scan < loceol &&
5110 reginclass(prog, p, (U8*)scan, 0, do_utf8)) {
5111 scan += UTF8SKIP(scan);
5115 while (scan < loceol && REGINCLASS(prog, p, (U8*)scan))
5122 LOAD_UTF8_CHARCLASS_ALNUM();
5123 while (hardcount < max && scan < loceol &&
5124 swash_fetch(PL_utf8_alnum, (U8*)scan, do_utf8)) {
5125 scan += UTF8SKIP(scan);
5129 while (scan < loceol && isALNUM(*scan))
5134 PL_reg_flags |= RF_tainted;
5137 while (hardcount < max && scan < loceol &&
5138 isALNUM_LC_utf8((U8*)scan)) {
5139 scan += UTF8SKIP(scan);
5143 while (scan < loceol && isALNUM_LC(*scan))
5150 LOAD_UTF8_CHARCLASS_ALNUM();
5151 while (hardcount < max && scan < loceol &&
5152 !swash_fetch(PL_utf8_alnum, (U8*)scan, do_utf8)) {
5153 scan += UTF8SKIP(scan);
5157 while (scan < loceol && !isALNUM(*scan))
5162 PL_reg_flags |= RF_tainted;
5165 while (hardcount < max && scan < loceol &&
5166 !isALNUM_LC_utf8((U8*)scan)) {
5167 scan += UTF8SKIP(scan);
5171 while (scan < loceol && !isALNUM_LC(*scan))
5178 LOAD_UTF8_CHARCLASS_SPACE();
5179 while (hardcount < max && scan < loceol &&
5181 swash_fetch(PL_utf8_space,(U8*)scan, do_utf8))) {
5182 scan += UTF8SKIP(scan);
5186 while (scan < loceol && isSPACE(*scan))
5191 PL_reg_flags |= RF_tainted;
5194 while (hardcount < max && scan < loceol &&
5195 (*scan == ' ' || isSPACE_LC_utf8((U8*)scan))) {
5196 scan += UTF8SKIP(scan);
5200 while (scan < loceol && isSPACE_LC(*scan))
5207 LOAD_UTF8_CHARCLASS_SPACE();
5208 while (hardcount < max && scan < loceol &&
5210 swash_fetch(PL_utf8_space,(U8*)scan, do_utf8))) {
5211 scan += UTF8SKIP(scan);
5215 while (scan < loceol && !isSPACE(*scan))
5220 PL_reg_flags |= RF_tainted;
5223 while (hardcount < max && scan < loceol &&
5224 !(*scan == ' ' || isSPACE_LC_utf8((U8*)scan))) {
5225 scan += UTF8SKIP(scan);
5229 while (scan < loceol && !isSPACE_LC(*scan))
5236 LOAD_UTF8_CHARCLASS_DIGIT();
5237 while (hardcount < max && scan < loceol &&
5238 swash_fetch(PL_utf8_digit, (U8*)scan, do_utf8)) {
5239 scan += UTF8SKIP(scan);
5243 while (scan < loceol && isDIGIT(*scan))
5250 LOAD_UTF8_CHARCLASS_DIGIT();
5251 while (hardcount < max && scan < loceol &&
5252 !swash_fetch(PL_utf8_digit, (U8*)scan, do_utf8)) {
5253 scan += UTF8SKIP(scan);
5257 while (scan < loceol && !isDIGIT(*scan))
5261 default: /* Called on something of 0 width. */
5262 break; /* So match right here or not at all. */
5268 c = scan - PL_reginput;
5272 GET_RE_DEBUG_FLAGS_DECL;
5274 SV * const prop = sv_newmortal();
5275 regprop(prog, prop, p);
5276 PerlIO_printf(Perl_debug_log,
5277 "%*s %s can match %"IVdf" times out of %"IVdf"...\n",
5278 REPORT_CODE_OFF + depth*2, "", SvPVX_const(prop),(IV)c,(IV)max);
5286 #if !defined(PERL_IN_XSUB_RE) || defined(PLUGGABLE_RE_EXTENSION)
5288 - regclass_swash - prepare the utf8 swash
5292 Perl_regclass_swash(pTHX_ const regexp *prog, register const regnode* node, bool doinit, SV** listsvp, SV **altsvp)
5298 const struct reg_data * const data = prog ? prog->data : NULL;
5300 if (data && data->count) {
5301 const U32 n = ARG(node);
5303 if (data->what[n] == 's') {
5304 SV * const rv = (SV*)data->data[n];
5305 AV * const av = (AV*)SvRV((SV*)rv);
5306 SV **const ary = AvARRAY(av);
5309 /* See the end of regcomp.c:S_regclass() for
5310 * documentation of these array elements. */
5313 a = SvROK(ary[1]) ? &ary[1] : 0;
5314 b = SvTYPE(ary[2]) == SVt_PVAV ? &ary[2] : 0;
5318 else if (si && doinit) {
5319 sw = swash_init("utf8", "", si, 1, 0);
5320 (void)av_store(av, 1, sw);
5337 - reginclass - determine if a character falls into a character class
5339 The n is the ANYOF regnode, the p is the target string, lenp
5340 is pointer to the maximum length of how far to go in the p
5341 (if the lenp is zero, UTF8SKIP(p) is used),
5342 do_utf8 tells whether the target string is in UTF-8.
5347 S_reginclass(pTHX_ const regexp *prog, register const regnode *n, register const U8* p, STRLEN* lenp, register bool do_utf8)
5350 const char flags = ANYOF_FLAGS(n);
5356 if (do_utf8 && !UTF8_IS_INVARIANT(c)) {
5357 c = utf8n_to_uvchr(p, UTF8_MAXBYTES, &len,
5358 (UTF8_ALLOW_DEFAULT & UTF8_ALLOW_ANYUV) | UTF8_CHECK_ONLY);
5359 /* see [perl #37836] for UTF8_ALLOW_ANYUV */
5360 if (len == (STRLEN)-1)
5361 Perl_croak(aTHX_ "Malformed UTF-8 character (fatal)");
5364 plen = lenp ? *lenp : UNISKIP(NATIVE_TO_UNI(c));
5365 if (do_utf8 || (flags & ANYOF_UNICODE)) {
5368 if (do_utf8 && !ANYOF_RUNTIME(n)) {
5369 if (len != (STRLEN)-1 && c < 256 && ANYOF_BITMAP_TEST(n, c))
5372 if (!match && do_utf8 && (flags & ANYOF_UNICODE_ALL) && c >= 256)
5376 SV * const sw = regclass_swash(prog, n, TRUE, 0, (SV**)&av);
5379 if (swash_fetch(sw, p, do_utf8))
5381 else if (flags & ANYOF_FOLD) {
5382 if (!match && lenp && av) {
5384 for (i = 0; i <= av_len(av); i++) {
5385 SV* const sv = *av_fetch(av, i, FALSE);
5387 const char * const s = SvPV_const(sv, len);
5389 if (len <= plen && memEQ(s, (char*)p, len)) {
5397 U8 tmpbuf[UTF8_MAXBYTES_CASE+1];
5400 to_utf8_fold(p, tmpbuf, &tmplen);
5401 if (swash_fetch(sw, tmpbuf, do_utf8))
5407 if (match && lenp && *lenp == 0)
5408 *lenp = UNISKIP(NATIVE_TO_UNI(c));
5410 if (!match && c < 256) {
5411 if (ANYOF_BITMAP_TEST(n, c))
5413 else if (flags & ANYOF_FOLD) {
5416 if (flags & ANYOF_LOCALE) {
5417 PL_reg_flags |= RF_tainted;
5418 f = PL_fold_locale[c];
5422 if (f != c && ANYOF_BITMAP_TEST(n, f))
5426 if (!match && (flags & ANYOF_CLASS)) {
5427 PL_reg_flags |= RF_tainted;
5429 (ANYOF_CLASS_TEST(n, ANYOF_ALNUM) && isALNUM_LC(c)) ||
5430 (ANYOF_CLASS_TEST(n, ANYOF_NALNUM) && !isALNUM_LC(c)) ||
5431 (ANYOF_CLASS_TEST(n, ANYOF_SPACE) && isSPACE_LC(c)) ||
5432 (ANYOF_CLASS_TEST(n, ANYOF_NSPACE) && !isSPACE_LC(c)) ||
5433 (ANYOF_CLASS_TEST(n, ANYOF_DIGIT) && isDIGIT_LC(c)) ||
5434 (ANYOF_CLASS_TEST(n, ANYOF_NDIGIT) && !isDIGIT_LC(c)) ||
5435 (ANYOF_CLASS_TEST(n, ANYOF_ALNUMC) && isALNUMC_LC(c)) ||
5436 (ANYOF_CLASS_TEST(n, ANYOF_NALNUMC) && !isALNUMC_LC(c)) ||
5437 (ANYOF_CLASS_TEST(n, ANYOF_ALPHA) && isALPHA_LC(c)) ||
5438 (ANYOF_CLASS_TEST(n, ANYOF_NALPHA) && !isALPHA_LC(c)) ||
5439 (ANYOF_CLASS_TEST(n, ANYOF_ASCII) && isASCII(c)) ||
5440 (ANYOF_CLASS_TEST(n, ANYOF_NASCII) && !isASCII(c)) ||
5441 (ANYOF_CLASS_TEST(n, ANYOF_CNTRL) && isCNTRL_LC(c)) ||
5442 (ANYOF_CLASS_TEST(n, ANYOF_NCNTRL) && !isCNTRL_LC(c)) ||
5443 (ANYOF_CLASS_TEST(n, ANYOF_GRAPH) && isGRAPH_LC(c)) ||
5444 (ANYOF_CLASS_TEST(n, ANYOF_NGRAPH) && !isGRAPH_LC(c)) ||
5445 (ANYOF_CLASS_TEST(n, ANYOF_LOWER) && isLOWER_LC(c)) ||
5446 (ANYOF_CLASS_TEST(n, ANYOF_NLOWER) && !isLOWER_LC(c)) ||
5447 (ANYOF_CLASS_TEST(n, ANYOF_PRINT) && isPRINT_LC(c)) ||
5448 (ANYOF_CLASS_TEST(n, ANYOF_NPRINT) && !isPRINT_LC(c)) ||
5449 (ANYOF_CLASS_TEST(n, ANYOF_PUNCT) && isPUNCT_LC(c)) ||
5450 (ANYOF_CLASS_TEST(n, ANYOF_NPUNCT) && !isPUNCT_LC(c)) ||
5451 (ANYOF_CLASS_TEST(n, ANYOF_UPPER) && isUPPER_LC(c)) ||
5452 (ANYOF_CLASS_TEST(n, ANYOF_NUPPER) && !isUPPER_LC(c)) ||
5453 (ANYOF_CLASS_TEST(n, ANYOF_XDIGIT) && isXDIGIT(c)) ||
5454 (ANYOF_CLASS_TEST(n, ANYOF_NXDIGIT) && !isXDIGIT(c)) ||
5455 (ANYOF_CLASS_TEST(n, ANYOF_PSXSPC) && isPSXSPC(c)) ||
5456 (ANYOF_CLASS_TEST(n, ANYOF_NPSXSPC) && !isPSXSPC(c)) ||
5457 (ANYOF_CLASS_TEST(n, ANYOF_BLANK) && isBLANK(c)) ||
5458 (ANYOF_CLASS_TEST(n, ANYOF_NBLANK) && !isBLANK(c))
5459 ) /* How's that for a conditional? */
5466 return (flags & ANYOF_INVERT) ? !match : match;
5470 S_reghop3(U8 *s, I32 off, const U8* lim)
5474 while (off-- && s < lim) {
5475 /* XXX could check well-formedness here */
5480 while (off++ && s > lim) {
5482 if (UTF8_IS_CONTINUED(*s)) {
5483 while (s > lim && UTF8_IS_CONTINUATION(*s))
5486 /* XXX could check well-formedness here */
5493 /* there are a bunch of places where we use two reghop3's that should
5494 be replaced with this routine. but since thats not done yet
5495 we ifdef it out - dmq
5498 S_reghop4(U8 *s, I32 off, const U8* llim, const U8* rlim)
5502 while (off-- && s < rlim) {
5503 /* XXX could check well-formedness here */
5508 while (off++ && s > llim) {
5510 if (UTF8_IS_CONTINUED(*s)) {
5511 while (s > llim && UTF8_IS_CONTINUATION(*s))
5514 /* XXX could check well-formedness here */
5522 S_reghopmaybe3(U8* s, I32 off, const U8* lim)
5526 while (off-- && s < lim) {
5527 /* XXX could check well-formedness here */
5534 while (off++ && s > lim) {
5536 if (UTF8_IS_CONTINUED(*s)) {
5537 while (s > lim && UTF8_IS_CONTINUATION(*s))
5540 /* XXX could check well-formedness here */
5549 restore_pos(pTHX_ void *arg)
5552 regexp * const rex = (regexp *)arg;
5553 if (PL_reg_eval_set) {
5554 if (PL_reg_oldsaved) {
5555 rex->subbeg = PL_reg_oldsaved;
5556 rex->sublen = PL_reg_oldsavedlen;
5557 #ifdef PERL_OLD_COPY_ON_WRITE
5558 rex->saved_copy = PL_nrs;
5560 RX_MATCH_COPIED_on(rex);
5562 PL_reg_magic->mg_len = PL_reg_oldpos;
5563 PL_reg_eval_set = 0;
5564 PL_curpm = PL_reg_oldcurpm;
5569 S_to_utf8_substr(pTHX_ register regexp *prog)
5571 if (prog->float_substr && !prog->float_utf8) {
5572 SV* const sv = newSVsv(prog->float_substr);
5573 prog->float_utf8 = sv;
5574 sv_utf8_upgrade(sv);
5575 if (SvTAIL(prog->float_substr))
5577 if (prog->float_substr == prog->check_substr)
5578 prog->check_utf8 = sv;
5580 if (prog->anchored_substr && !prog->anchored_utf8) {
5581 SV* const sv = newSVsv(prog->anchored_substr);
5582 prog->anchored_utf8 = sv;
5583 sv_utf8_upgrade(sv);
5584 if (SvTAIL(prog->anchored_substr))
5586 if (prog->anchored_substr == prog->check_substr)
5587 prog->check_utf8 = sv;
5592 S_to_byte_substr(pTHX_ register regexp *prog)
5595 if (prog->float_utf8 && !prog->float_substr) {
5596 SV* sv = newSVsv(prog->float_utf8);
5597 prog->float_substr = sv;
5598 if (sv_utf8_downgrade(sv, TRUE)) {
5599 if (SvTAIL(prog->float_utf8))
5603 prog->float_substr = sv = &PL_sv_undef;
5605 if (prog->float_utf8 == prog->check_utf8)
5606 prog->check_substr = sv;
5608 if (prog->anchored_utf8 && !prog->anchored_substr) {
5609 SV* sv = newSVsv(prog->anchored_utf8);
5610 prog->anchored_substr = sv;
5611 if (sv_utf8_downgrade(sv, TRUE)) {
5612 if (SvTAIL(prog->anchored_utf8))
5616 prog->anchored_substr = sv = &PL_sv_undef;
5618 if (prog->anchored_utf8 == prog->check_utf8)
5619 prog->check_substr = sv;
5625 * c-indentation-style: bsd
5627 * indent-tabs-mode: t
5630 * ex: set ts=8 sts=4 sw=4 noet: