5 * "A fair jaw-cracker dwarf-language must be." --Samwise Gamgee
8 /* This file contains functions for compiling a regular expression. See
9 * also regexec.c which funnily enough, contains functions for executing
10 * a regular expression.
12 * This file is also copied at build time to ext/re/re_comp.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.
57 **** Alterations to Henry's code are...
59 **** Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
60 **** 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 by Larry Wall and others
62 **** You may distribute under the terms of either the GNU General Public
63 **** License or the Artistic License, as specified in the README file.
66 * Beware that some of this code is subtly aware of the way operator
67 * precedence is structured in regular expressions. Serious changes in
68 * regular-expression syntax might require a total rethink.
71 #define PERL_IN_REGCOMP_C
74 #ifndef PERL_IN_XSUB_RE
79 #ifdef PERL_IN_XSUB_RE
90 # if defined(BUGGY_MSC6)
91 /* MSC 6.00A breaks on op/regexp.t test 85 unless we turn this off */
92 # pragma optimize("a",off)
93 /* But MSC 6.00A is happy with 'w', for aliases only across function calls*/
94 # pragma optimize("w",on )
95 # endif /* BUGGY_MSC6 */
102 typedef struct RExC_state_t {
103 U32 flags; /* are we folding, multilining? */
104 char *precomp; /* uncompiled string. */
105 REGEXP *rx_sv; /* The SV that is the regexp. */
106 regexp *rx; /* perl core regexp structure */
107 regexp_internal *rxi; /* internal data for regexp object pprivate field */
108 char *start; /* Start of input for compile */
109 char *end; /* End of input for compile */
110 char *parse; /* Input-scan pointer. */
111 I32 whilem_seen; /* number of WHILEM in this expr */
112 regnode *emit_start; /* Start of emitted-code area */
113 regnode *emit_bound; /* First regnode outside of the allocated space */
114 regnode *emit; /* Code-emit pointer; ®dummy = don't = compiling */
115 I32 naughty; /* How bad is this pattern? */
116 I32 sawback; /* Did we see \1, ...? */
118 I32 size; /* Code size. */
119 I32 npar; /* Capture buffer count, (OPEN). */
120 I32 cpar; /* Capture buffer count, (CLOSE). */
121 I32 nestroot; /* root parens we are in - used by accept */
125 regnode **open_parens; /* pointers to open parens */
126 regnode **close_parens; /* pointers to close parens */
127 regnode *opend; /* END node in program */
128 I32 utf8; /* whether the pattern is utf8 or not */
129 I32 orig_utf8; /* whether the pattern was originally in utf8 */
130 /* XXX use this for future optimisation of case
131 * where pattern must be upgraded to utf8. */
132 HV *charnames; /* cache of named sequences */
133 HV *paren_names; /* Paren names */
135 regnode **recurse; /* Recurse regops */
136 I32 recurse_count; /* Number of recurse regops */
138 char *starttry; /* -Dr: where regtry was called. */
139 #define RExC_starttry (pRExC_state->starttry)
142 const char *lastparse;
144 AV *paren_name_list; /* idx -> name */
145 #define RExC_lastparse (pRExC_state->lastparse)
146 #define RExC_lastnum (pRExC_state->lastnum)
147 #define RExC_paren_name_list (pRExC_state->paren_name_list)
151 #define RExC_flags (pRExC_state->flags)
152 #define RExC_precomp (pRExC_state->precomp)
153 #define RExC_rx_sv (pRExC_state->rx_sv)
154 #define RExC_rx (pRExC_state->rx)
155 #define RExC_rxi (pRExC_state->rxi)
156 #define RExC_start (pRExC_state->start)
157 #define RExC_end (pRExC_state->end)
158 #define RExC_parse (pRExC_state->parse)
159 #define RExC_whilem_seen (pRExC_state->whilem_seen)
160 #ifdef RE_TRACK_PATTERN_OFFSETS
161 #define RExC_offsets (pRExC_state->rxi->u.offsets) /* I am not like the others */
163 #define RExC_emit (pRExC_state->emit)
164 #define RExC_emit_start (pRExC_state->emit_start)
165 #define RExC_emit_bound (pRExC_state->emit_bound)
166 #define RExC_naughty (pRExC_state->naughty)
167 #define RExC_sawback (pRExC_state->sawback)
168 #define RExC_seen (pRExC_state->seen)
169 #define RExC_size (pRExC_state->size)
170 #define RExC_npar (pRExC_state->npar)
171 #define RExC_nestroot (pRExC_state->nestroot)
172 #define RExC_extralen (pRExC_state->extralen)
173 #define RExC_seen_zerolen (pRExC_state->seen_zerolen)
174 #define RExC_seen_evals (pRExC_state->seen_evals)
175 #define RExC_utf8 (pRExC_state->utf8)
176 #define RExC_orig_utf8 (pRExC_state->orig_utf8)
177 #define RExC_charnames (pRExC_state->charnames)
178 #define RExC_open_parens (pRExC_state->open_parens)
179 #define RExC_close_parens (pRExC_state->close_parens)
180 #define RExC_opend (pRExC_state->opend)
181 #define RExC_paren_names (pRExC_state->paren_names)
182 #define RExC_recurse (pRExC_state->recurse)
183 #define RExC_recurse_count (pRExC_state->recurse_count)
186 #define ISMULT1(c) ((c) == '*' || (c) == '+' || (c) == '?')
187 #define ISMULT2(s) ((*s) == '*' || (*s) == '+' || (*s) == '?' || \
188 ((*s) == '{' && regcurly(s)))
191 #undef SPSTART /* dratted cpp namespace... */
194 * Flags to be passed up and down.
196 #define WORST 0 /* Worst case. */
197 #define HASWIDTH 0x01 /* Known to match non-null strings. */
198 #define SIMPLE 0x02 /* Simple enough to be STAR/PLUS operand. */
199 #define SPSTART 0x04 /* Starts with * or +. */
200 #define TRYAGAIN 0x08 /* Weeded out a declaration. */
201 #define POSTPONED 0x10 /* (?1),(?&name), (??{...}) or similar */
203 #define REG_NODE_NUM(x) ((x) ? (int)((x)-RExC_emit_start) : -1)
205 /* whether trie related optimizations are enabled */
206 #if PERL_ENABLE_EXTENDED_TRIE_OPTIMISATION
207 #define TRIE_STUDY_OPT
208 #define FULL_TRIE_STUDY
214 #define PBYTE(u8str,paren) ((U8*)(u8str))[(paren) >> 3]
215 #define PBITVAL(paren) (1 << ((paren) & 7))
216 #define PAREN_TEST(u8str,paren) ( PBYTE(u8str,paren) & PBITVAL(paren))
217 #define PAREN_SET(u8str,paren) PBYTE(u8str,paren) |= PBITVAL(paren)
218 #define PAREN_UNSET(u8str,paren) PBYTE(u8str,paren) &= (~PBITVAL(paren))
221 /* About scan_data_t.
223 During optimisation we recurse through the regexp program performing
224 various inplace (keyhole style) optimisations. In addition study_chunk
225 and scan_commit populate this data structure with information about
226 what strings MUST appear in the pattern. We look for the longest
227 string that must appear for at a fixed location, and we look for the
228 longest string that may appear at a floating location. So for instance
233 Both 'FOO' and 'A' are fixed strings. Both 'B' and 'BAR' are floating
234 strings (because they follow a .* construct). study_chunk will identify
235 both FOO and BAR as being the longest fixed and floating strings respectively.
237 The strings can be composites, for instance
241 will result in a composite fixed substring 'foo'.
243 For each string some basic information is maintained:
245 - offset or min_offset
246 This is the position the string must appear at, or not before.
247 It also implicitly (when combined with minlenp) tells us how many
248 character must match before the string we are searching.
249 Likewise when combined with minlenp and the length of the string
250 tells us how many characters must appear after the string we have
254 Only used for floating strings. This is the rightmost point that
255 the string can appear at. Ifset to I32 max it indicates that the
256 string can occur infinitely far to the right.
259 A pointer to the minimum length of the pattern that the string
260 was found inside. This is important as in the case of positive
261 lookahead or positive lookbehind we can have multiple patterns
266 The minimum length of the pattern overall is 3, the minimum length
267 of the lookahead part is 3, but the minimum length of the part that
268 will actually match is 1. So 'FOO's minimum length is 3, but the
269 minimum length for the F is 1. This is important as the minimum length
270 is used to determine offsets in front of and behind the string being
271 looked for. Since strings can be composites this is the length of the
272 pattern at the time it was commited with a scan_commit. Note that
273 the length is calculated by study_chunk, so that the minimum lengths
274 are not known until the full pattern has been compiled, thus the
275 pointer to the value.
279 In the case of lookbehind the string being searched for can be
280 offset past the start point of the final matching string.
281 If this value was just blithely removed from the min_offset it would
282 invalidate some of the calculations for how many chars must match
283 before or after (as they are derived from min_offset and minlen and
284 the length of the string being searched for).
285 When the final pattern is compiled and the data is moved from the
286 scan_data_t structure into the regexp structure the information
287 about lookbehind is factored in, with the information that would
288 have been lost precalculated in the end_shift field for the
291 The fields pos_min and pos_delta are used to store the minimum offset
292 and the delta to the maximum offset at the current point in the pattern.
296 typedef struct scan_data_t {
297 /*I32 len_min; unused */
298 /*I32 len_delta; unused */
302 I32 last_end; /* min value, <0 unless valid. */
305 SV **longest; /* Either &l_fixed, or &l_float. */
306 SV *longest_fixed; /* longest fixed string found in pattern */
307 I32 offset_fixed; /* offset where it starts */
308 I32 *minlen_fixed; /* pointer to the minlen relevent to the string */
309 I32 lookbehind_fixed; /* is the position of the string modfied by LB */
310 SV *longest_float; /* longest floating string found in pattern */
311 I32 offset_float_min; /* earliest point in string it can appear */
312 I32 offset_float_max; /* latest point in string it can appear */
313 I32 *minlen_float; /* pointer to the minlen relevent to the string */
314 I32 lookbehind_float; /* is the position of the string modified by LB */
318 struct regnode_charclass_class *start_class;
322 * Forward declarations for pregcomp()'s friends.
325 static const scan_data_t zero_scan_data =
326 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ,0};
328 #define SF_BEFORE_EOL (SF_BEFORE_SEOL|SF_BEFORE_MEOL)
329 #define SF_BEFORE_SEOL 0x0001
330 #define SF_BEFORE_MEOL 0x0002
331 #define SF_FIX_BEFORE_EOL (SF_FIX_BEFORE_SEOL|SF_FIX_BEFORE_MEOL)
332 #define SF_FL_BEFORE_EOL (SF_FL_BEFORE_SEOL|SF_FL_BEFORE_MEOL)
335 # define SF_FIX_SHIFT_EOL (0+2)
336 # define SF_FL_SHIFT_EOL (0+4)
338 # define SF_FIX_SHIFT_EOL (+2)
339 # define SF_FL_SHIFT_EOL (+4)
342 #define SF_FIX_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FIX_SHIFT_EOL)
343 #define SF_FIX_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FIX_SHIFT_EOL)
345 #define SF_FL_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FL_SHIFT_EOL)
346 #define SF_FL_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FL_SHIFT_EOL) /* 0x20 */
347 #define SF_IS_INF 0x0040
348 #define SF_HAS_PAR 0x0080
349 #define SF_IN_PAR 0x0100
350 #define SF_HAS_EVAL 0x0200
351 #define SCF_DO_SUBSTR 0x0400
352 #define SCF_DO_STCLASS_AND 0x0800
353 #define SCF_DO_STCLASS_OR 0x1000
354 #define SCF_DO_STCLASS (SCF_DO_STCLASS_AND|SCF_DO_STCLASS_OR)
355 #define SCF_WHILEM_VISITED_POS 0x2000
357 #define SCF_TRIE_RESTUDY 0x4000 /* Do restudy? */
358 #define SCF_SEEN_ACCEPT 0x8000
360 #define UTF (RExC_utf8 != 0)
361 #define LOC ((RExC_flags & RXf_PMf_LOCALE) != 0)
362 #define FOLD ((RExC_flags & RXf_PMf_FOLD) != 0)
364 #define OOB_UNICODE 12345678
365 #define OOB_NAMEDCLASS -1
367 #define CHR_SVLEN(sv) (UTF ? sv_len_utf8(sv) : SvCUR(sv))
368 #define CHR_DIST(a,b) (UTF ? utf8_distance(a,b) : a - b)
371 /* length of regex to show in messages that don't mark a position within */
372 #define RegexLengthToShowInErrorMessages 127
375 * If MARKER[12] are adjusted, be sure to adjust the constants at the top
376 * of t/op/regmesg.t, the tests in t/op/re_tests, and those in
377 * op/pragma/warn/regcomp.
379 #define MARKER1 "<-- HERE" /* marker as it appears in the description */
380 #define MARKER2 " <-- HERE " /* marker as it appears within the regex */
382 #define REPORT_LOCATION " in regex; marked by " MARKER1 " in m/%.*s" MARKER2 "%s/"
385 * Calls SAVEDESTRUCTOR_X if needed, then calls Perl_croak with the given
386 * arg. Show regex, up to a maximum length. If it's too long, chop and add
389 #define _FAIL(code) STMT_START { \
390 const char *ellipses = ""; \
391 IV len = RExC_end - RExC_precomp; \
394 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx_sv); \
395 if (len > RegexLengthToShowInErrorMessages) { \
396 /* chop 10 shorter than the max, to ensure meaning of "..." */ \
397 len = RegexLengthToShowInErrorMessages - 10; \
403 #define FAIL(msg) _FAIL( \
404 Perl_croak(aTHX_ "%s in regex m/%.*s%s/", \
405 msg, (int)len, RExC_precomp, ellipses))
407 #define FAIL2(msg,arg) _FAIL( \
408 Perl_croak(aTHX_ msg " in regex m/%.*s%s/", \
409 arg, (int)len, RExC_precomp, ellipses))
412 * Simple_vFAIL -- like FAIL, but marks the current location in the scan
414 #define Simple_vFAIL(m) STMT_START { \
415 const IV offset = RExC_parse - RExC_precomp; \
416 Perl_croak(aTHX_ "%s" REPORT_LOCATION, \
417 m, (int)offset, RExC_precomp, RExC_precomp + offset); \
421 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL()
423 #define vFAIL(m) STMT_START { \
425 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx_sv); \
430 * Like Simple_vFAIL(), but accepts two arguments.
432 #define Simple_vFAIL2(m,a1) STMT_START { \
433 const IV offset = RExC_parse - RExC_precomp; \
434 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, \
435 (int)offset, RExC_precomp, RExC_precomp + offset); \
439 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL2().
441 #define vFAIL2(m,a1) STMT_START { \
443 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx_sv); \
444 Simple_vFAIL2(m, a1); \
449 * Like Simple_vFAIL(), but accepts three arguments.
451 #define Simple_vFAIL3(m, a1, a2) STMT_START { \
452 const IV offset = RExC_parse - RExC_precomp; \
453 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, \
454 (int)offset, RExC_precomp, RExC_precomp + offset); \
458 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL3().
460 #define vFAIL3(m,a1,a2) STMT_START { \
462 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx_sv); \
463 Simple_vFAIL3(m, a1, a2); \
467 * Like Simple_vFAIL(), but accepts four arguments.
469 #define Simple_vFAIL4(m, a1, a2, a3) STMT_START { \
470 const IV offset = RExC_parse - RExC_precomp; \
471 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, a3, \
472 (int)offset, RExC_precomp, RExC_precomp + offset); \
475 #define vWARN(loc,m) STMT_START { \
476 const IV offset = loc - RExC_precomp; \
477 Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s" REPORT_LOCATION, \
478 m, (int)offset, RExC_precomp, RExC_precomp + offset); \
481 #define vWARNdep(loc,m) STMT_START { \
482 const IV offset = loc - RExC_precomp; \
483 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_REGEXP), \
484 "%s" REPORT_LOCATION, \
485 m, (int)offset, RExC_precomp, RExC_precomp + offset); \
489 #define vWARN2(loc, m, a1) STMT_START { \
490 const IV offset = loc - RExC_precomp; \
491 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
492 a1, (int)offset, RExC_precomp, RExC_precomp + offset); \
495 #define vWARN3(loc, m, a1, a2) STMT_START { \
496 const IV offset = loc - RExC_precomp; \
497 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
498 a1, a2, (int)offset, RExC_precomp, RExC_precomp + offset); \
501 #define vWARN4(loc, m, a1, a2, a3) STMT_START { \
502 const IV offset = loc - RExC_precomp; \
503 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
504 a1, a2, a3, (int)offset, RExC_precomp, RExC_precomp + offset); \
507 #define vWARN5(loc, m, a1, a2, a3, a4) STMT_START { \
508 const IV offset = loc - RExC_precomp; \
509 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
510 a1, a2, a3, a4, (int)offset, RExC_precomp, RExC_precomp + offset); \
514 /* Allow for side effects in s */
515 #define REGC(c,s) STMT_START { \
516 if (!SIZE_ONLY) *(s) = (c); else (void)(s); \
519 /* Macros for recording node offsets. 20001227 mjd@plover.com
520 * Nodes are numbered 1, 2, 3, 4. Node #n's position is recorded in
521 * element 2*n-1 of the array. Element #2n holds the byte length node #n.
522 * Element 0 holds the number n.
523 * Position is 1 indexed.
525 #ifndef RE_TRACK_PATTERN_OFFSETS
526 #define Set_Node_Offset_To_R(node,byte)
527 #define Set_Node_Offset(node,byte)
528 #define Set_Cur_Node_Offset
529 #define Set_Node_Length_To_R(node,len)
530 #define Set_Node_Length(node,len)
531 #define Set_Node_Cur_Length(node)
532 #define Node_Offset(n)
533 #define Node_Length(n)
534 #define Set_Node_Offset_Length(node,offset,len)
535 #define ProgLen(ri) ri->u.proglen
536 #define SetProgLen(ri,x) ri->u.proglen = x
538 #define ProgLen(ri) ri->u.offsets[0]
539 #define SetProgLen(ri,x) ri->u.offsets[0] = x
540 #define Set_Node_Offset_To_R(node,byte) STMT_START { \
542 MJD_OFFSET_DEBUG(("** (%d) offset of node %d is %d.\n", \
543 __LINE__, (int)(node), (int)(byte))); \
545 Perl_croak(aTHX_ "value of node is %d in Offset macro", (int)(node)); \
547 RExC_offsets[2*(node)-1] = (byte); \
552 #define Set_Node_Offset(node,byte) \
553 Set_Node_Offset_To_R((node)-RExC_emit_start, (byte)-RExC_start)
554 #define Set_Cur_Node_Offset Set_Node_Offset(RExC_emit, RExC_parse)
556 #define Set_Node_Length_To_R(node,len) STMT_START { \
558 MJD_OFFSET_DEBUG(("** (%d) size of node %d is %d.\n", \
559 __LINE__, (int)(node), (int)(len))); \
561 Perl_croak(aTHX_ "value of node is %d in Length macro", (int)(node)); \
563 RExC_offsets[2*(node)] = (len); \
568 #define Set_Node_Length(node,len) \
569 Set_Node_Length_To_R((node)-RExC_emit_start, len)
570 #define Set_Cur_Node_Length(len) Set_Node_Length(RExC_emit, len)
571 #define Set_Node_Cur_Length(node) \
572 Set_Node_Length(node, RExC_parse - parse_start)
574 /* Get offsets and lengths */
575 #define Node_Offset(n) (RExC_offsets[2*((n)-RExC_emit_start)-1])
576 #define Node_Length(n) (RExC_offsets[2*((n)-RExC_emit_start)])
578 #define Set_Node_Offset_Length(node,offset,len) STMT_START { \
579 Set_Node_Offset_To_R((node)-RExC_emit_start, (offset)); \
580 Set_Node_Length_To_R((node)-RExC_emit_start, (len)); \
584 #if PERL_ENABLE_EXPERIMENTAL_REGEX_OPTIMISATIONS
585 #define EXPERIMENTAL_INPLACESCAN
586 #endif /*RE_TRACK_PATTERN_OFFSETS*/
588 #define DEBUG_STUDYDATA(str,data,depth) \
589 DEBUG_OPTIMISE_MORE_r(if(data){ \
590 PerlIO_printf(Perl_debug_log, \
591 "%*s" str "Pos:%"IVdf"/%"IVdf \
592 " Flags: 0x%"UVXf" Whilem_c: %"IVdf" Lcp: %"IVdf" %s", \
593 (int)(depth)*2, "", \
594 (IV)((data)->pos_min), \
595 (IV)((data)->pos_delta), \
596 (UV)((data)->flags), \
597 (IV)((data)->whilem_c), \
598 (IV)((data)->last_closep ? *((data)->last_closep) : -1), \
599 is_inf ? "INF " : "" \
601 if ((data)->last_found) \
602 PerlIO_printf(Perl_debug_log, \
603 "Last:'%s' %"IVdf":%"IVdf"/%"IVdf" %sFixed:'%s' @ %"IVdf \
604 " %sFloat: '%s' @ %"IVdf"/%"IVdf"", \
605 SvPVX_const((data)->last_found), \
606 (IV)((data)->last_end), \
607 (IV)((data)->last_start_min), \
608 (IV)((data)->last_start_max), \
609 ((data)->longest && \
610 (data)->longest==&((data)->longest_fixed)) ? "*" : "", \
611 SvPVX_const((data)->longest_fixed), \
612 (IV)((data)->offset_fixed), \
613 ((data)->longest && \
614 (data)->longest==&((data)->longest_float)) ? "*" : "", \
615 SvPVX_const((data)->longest_float), \
616 (IV)((data)->offset_float_min), \
617 (IV)((data)->offset_float_max) \
619 PerlIO_printf(Perl_debug_log,"\n"); \
622 static void clear_re(pTHX_ void *r);
624 /* Mark that we cannot extend a found fixed substring at this point.
625 Update the longest found anchored substring and the longest found
626 floating substrings if needed. */
629 S_scan_commit(pTHX_ const RExC_state_t *pRExC_state, scan_data_t *data, I32 *minlenp, int is_inf)
631 const STRLEN l = CHR_SVLEN(data->last_found);
632 const STRLEN old_l = CHR_SVLEN(*data->longest);
633 GET_RE_DEBUG_FLAGS_DECL;
635 PERL_ARGS_ASSERT_SCAN_COMMIT;
637 if ((l >= old_l) && ((l > old_l) || (data->flags & SF_BEFORE_EOL))) {
638 SvSetMagicSV(*data->longest, data->last_found);
639 if (*data->longest == data->longest_fixed) {
640 data->offset_fixed = l ? data->last_start_min : data->pos_min;
641 if (data->flags & SF_BEFORE_EOL)
643 |= ((data->flags & SF_BEFORE_EOL) << SF_FIX_SHIFT_EOL);
645 data->flags &= ~SF_FIX_BEFORE_EOL;
646 data->minlen_fixed=minlenp;
647 data->lookbehind_fixed=0;
649 else { /* *data->longest == data->longest_float */
650 data->offset_float_min = l ? data->last_start_min : data->pos_min;
651 data->offset_float_max = (l
652 ? data->last_start_max
653 : data->pos_min + data->pos_delta);
654 if (is_inf || (U32)data->offset_float_max > (U32)I32_MAX)
655 data->offset_float_max = I32_MAX;
656 if (data->flags & SF_BEFORE_EOL)
658 |= ((data->flags & SF_BEFORE_EOL) << SF_FL_SHIFT_EOL);
660 data->flags &= ~SF_FL_BEFORE_EOL;
661 data->minlen_float=minlenp;
662 data->lookbehind_float=0;
665 SvCUR_set(data->last_found, 0);
667 SV * const sv = data->last_found;
668 if (SvUTF8(sv) && SvMAGICAL(sv)) {
669 MAGIC * const mg = mg_find(sv, PERL_MAGIC_utf8);
675 data->flags &= ~SF_BEFORE_EOL;
676 DEBUG_STUDYDATA("commit: ",data,0);
679 /* Can match anything (initialization) */
681 S_cl_anything(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
683 PERL_ARGS_ASSERT_CL_ANYTHING;
685 ANYOF_CLASS_ZERO(cl);
686 ANYOF_BITMAP_SETALL(cl);
687 cl->flags = ANYOF_EOS|ANYOF_UNICODE_ALL;
689 cl->flags |= ANYOF_LOCALE;
692 /* Can match anything (initialization) */
694 S_cl_is_anything(const struct regnode_charclass_class *cl)
698 PERL_ARGS_ASSERT_CL_IS_ANYTHING;
700 for (value = 0; value <= ANYOF_MAX; value += 2)
701 if (ANYOF_CLASS_TEST(cl, value) && ANYOF_CLASS_TEST(cl, value + 1))
703 if (!(cl->flags & ANYOF_UNICODE_ALL))
705 if (!ANYOF_BITMAP_TESTALLSET((const void*)cl))
710 /* Can match anything (initialization) */
712 S_cl_init(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
714 PERL_ARGS_ASSERT_CL_INIT;
716 Zero(cl, 1, struct regnode_charclass_class);
718 cl_anything(pRExC_state, cl);
722 S_cl_init_zero(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
724 PERL_ARGS_ASSERT_CL_INIT_ZERO;
726 Zero(cl, 1, struct regnode_charclass_class);
728 cl_anything(pRExC_state, cl);
730 cl->flags |= ANYOF_LOCALE;
733 /* 'And' a given class with another one. Can create false positives */
734 /* We assume that cl is not inverted */
736 S_cl_and(struct regnode_charclass_class *cl,
737 const struct regnode_charclass_class *and_with)
739 PERL_ARGS_ASSERT_CL_AND;
741 assert(and_with->type == ANYOF);
742 if (!(and_with->flags & ANYOF_CLASS)
743 && !(cl->flags & ANYOF_CLASS)
744 && (and_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
745 && !(and_with->flags & ANYOF_FOLD)
746 && !(cl->flags & ANYOF_FOLD)) {
749 if (and_with->flags & ANYOF_INVERT)
750 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
751 cl->bitmap[i] &= ~and_with->bitmap[i];
753 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
754 cl->bitmap[i] &= and_with->bitmap[i];
755 } /* XXXX: logic is complicated otherwise, leave it along for a moment. */
756 if (!(and_with->flags & ANYOF_EOS))
757 cl->flags &= ~ANYOF_EOS;
759 if (cl->flags & ANYOF_UNICODE_ALL && and_with->flags & ANYOF_UNICODE &&
760 !(and_with->flags & ANYOF_INVERT)) {
761 cl->flags &= ~ANYOF_UNICODE_ALL;
762 cl->flags |= ANYOF_UNICODE;
763 ARG_SET(cl, ARG(and_with));
765 if (!(and_with->flags & ANYOF_UNICODE_ALL) &&
766 !(and_with->flags & ANYOF_INVERT))
767 cl->flags &= ~ANYOF_UNICODE_ALL;
768 if (!(and_with->flags & (ANYOF_UNICODE|ANYOF_UNICODE_ALL)) &&
769 !(and_with->flags & ANYOF_INVERT))
770 cl->flags &= ~ANYOF_UNICODE;
773 /* 'OR' a given class with another one. Can create false positives */
774 /* We assume that cl is not inverted */
776 S_cl_or(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl, const struct regnode_charclass_class *or_with)
778 PERL_ARGS_ASSERT_CL_OR;
780 if (or_with->flags & ANYOF_INVERT) {
782 * (B1 | CL1) | (!B2 & !CL2) = (B1 | !B2 & !CL2) | (CL1 | (!B2 & !CL2))
783 * <= (B1 | !B2) | (CL1 | !CL2)
784 * which is wasteful if CL2 is small, but we ignore CL2:
785 * (B1 | CL1) | (!B2 & !CL2) <= (B1 | CL1) | !B2 = (B1 | !B2) | CL1
786 * XXXX Can we handle case-fold? Unclear:
787 * (OK1(i) | OK1(i')) | !(OK1(i) | OK1(i')) =
788 * (OK1(i) | OK1(i')) | (!OK1(i) & !OK1(i'))
790 if ( (or_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
791 && !(or_with->flags & ANYOF_FOLD)
792 && !(cl->flags & ANYOF_FOLD) ) {
795 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
796 cl->bitmap[i] |= ~or_with->bitmap[i];
797 } /* XXXX: logic is complicated otherwise */
799 cl_anything(pRExC_state, cl);
802 /* (B1 | CL1) | (B2 | CL2) = (B1 | B2) | (CL1 | CL2)) */
803 if ( (or_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
804 && (!(or_with->flags & ANYOF_FOLD)
805 || (cl->flags & ANYOF_FOLD)) ) {
808 /* OR char bitmap and class bitmap separately */
809 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
810 cl->bitmap[i] |= or_with->bitmap[i];
811 if (or_with->flags & ANYOF_CLASS) {
812 for (i = 0; i < ANYOF_CLASSBITMAP_SIZE; i++)
813 cl->classflags[i] |= or_with->classflags[i];
814 cl->flags |= ANYOF_CLASS;
817 else { /* XXXX: logic is complicated, leave it along for a moment. */
818 cl_anything(pRExC_state, cl);
821 if (or_with->flags & ANYOF_EOS)
822 cl->flags |= ANYOF_EOS;
824 if (cl->flags & ANYOF_UNICODE && or_with->flags & ANYOF_UNICODE &&
825 ARG(cl) != ARG(or_with)) {
826 cl->flags |= ANYOF_UNICODE_ALL;
827 cl->flags &= ~ANYOF_UNICODE;
829 if (or_with->flags & ANYOF_UNICODE_ALL) {
830 cl->flags |= ANYOF_UNICODE_ALL;
831 cl->flags &= ~ANYOF_UNICODE;
835 #define TRIE_LIST_ITEM(state,idx) (trie->states[state].trans.list)[ idx ]
836 #define TRIE_LIST_CUR(state) ( TRIE_LIST_ITEM( state, 0 ).forid )
837 #define TRIE_LIST_LEN(state) ( TRIE_LIST_ITEM( state, 0 ).newstate )
838 #define TRIE_LIST_USED(idx) ( trie->states[state].trans.list ? (TRIE_LIST_CUR( idx ) - 1) : 0 )
843 dump_trie(trie,widecharmap,revcharmap)
844 dump_trie_interim_list(trie,widecharmap,revcharmap,next_alloc)
845 dump_trie_interim_table(trie,widecharmap,revcharmap,next_alloc)
847 These routines dump out a trie in a somewhat readable format.
848 The _interim_ variants are used for debugging the interim
849 tables that are used to generate the final compressed
850 representation which is what dump_trie expects.
852 Part of the reason for their existance is to provide a form
853 of documentation as to how the different representations function.
858 Dumps the final compressed table form of the trie to Perl_debug_log.
859 Used for debugging make_trie().
863 S_dump_trie(pTHX_ const struct _reg_trie_data *trie, HV *widecharmap,
864 AV *revcharmap, U32 depth)
867 SV *sv=sv_newmortal();
868 int colwidth= widecharmap ? 6 : 4;
869 GET_RE_DEBUG_FLAGS_DECL;
871 PERL_ARGS_ASSERT_DUMP_TRIE;
873 PerlIO_printf( Perl_debug_log, "%*sChar : %-6s%-6s%-4s ",
874 (int)depth * 2 + 2,"",
875 "Match","Base","Ofs" );
877 for( state = 0 ; state < trie->uniquecharcount ; state++ ) {
878 SV ** const tmp = av_fetch( revcharmap, state, 0);
880 PerlIO_printf( Perl_debug_log, "%*s",
882 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
883 PL_colors[0], PL_colors[1],
884 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
885 PERL_PV_ESCAPE_FIRSTCHAR
890 PerlIO_printf( Perl_debug_log, "\n%*sState|-----------------------",
891 (int)depth * 2 + 2,"");
893 for( state = 0 ; state < trie->uniquecharcount ; state++ )
894 PerlIO_printf( Perl_debug_log, "%.*s", colwidth, "--------");
895 PerlIO_printf( Perl_debug_log, "\n");
897 for( state = 1 ; state < trie->statecount ; state++ ) {
898 const U32 base = trie->states[ state ].trans.base;
900 PerlIO_printf( Perl_debug_log, "%*s#%4"UVXf"|", (int)depth * 2 + 2,"", (UV)state);
902 if ( trie->states[ state ].wordnum ) {
903 PerlIO_printf( Perl_debug_log, " W%4X", trie->states[ state ].wordnum );
905 PerlIO_printf( Perl_debug_log, "%6s", "" );
908 PerlIO_printf( Perl_debug_log, " @%4"UVXf" ", (UV)base );
913 while( ( base + ofs < trie->uniquecharcount ) ||
914 ( base + ofs - trie->uniquecharcount < trie->lasttrans
915 && trie->trans[ base + ofs - trie->uniquecharcount ].check != state))
918 PerlIO_printf( Perl_debug_log, "+%2"UVXf"[ ", (UV)ofs);
920 for ( ofs = 0 ; ofs < trie->uniquecharcount ; ofs++ ) {
921 if ( ( base + ofs >= trie->uniquecharcount ) &&
922 ( base + ofs - trie->uniquecharcount < trie->lasttrans ) &&
923 trie->trans[ base + ofs - trie->uniquecharcount ].check == state )
925 PerlIO_printf( Perl_debug_log, "%*"UVXf,
927 (UV)trie->trans[ base + ofs - trie->uniquecharcount ].next );
929 PerlIO_printf( Perl_debug_log, "%*s",colwidth," ." );
933 PerlIO_printf( Perl_debug_log, "]");
936 PerlIO_printf( Perl_debug_log, "\n" );
940 Dumps a fully constructed but uncompressed trie in list form.
941 List tries normally only are used for construction when the number of
942 possible chars (trie->uniquecharcount) is very high.
943 Used for debugging make_trie().
946 S_dump_trie_interim_list(pTHX_ const struct _reg_trie_data *trie,
947 HV *widecharmap, AV *revcharmap, U32 next_alloc,
951 SV *sv=sv_newmortal();
952 int colwidth= widecharmap ? 6 : 4;
953 GET_RE_DEBUG_FLAGS_DECL;
955 PERL_ARGS_ASSERT_DUMP_TRIE_INTERIM_LIST;
957 /* print out the table precompression. */
958 PerlIO_printf( Perl_debug_log, "%*sState :Word | Transition Data\n%*s%s",
959 (int)depth * 2 + 2,"", (int)depth * 2 + 2,"",
960 "------:-----+-----------------\n" );
962 for( state=1 ; state < next_alloc ; state ++ ) {
965 PerlIO_printf( Perl_debug_log, "%*s %4"UVXf" :",
966 (int)depth * 2 + 2,"", (UV)state );
967 if ( ! trie->states[ state ].wordnum ) {
968 PerlIO_printf( Perl_debug_log, "%5s| ","");
970 PerlIO_printf( Perl_debug_log, "W%4x| ",
971 trie->states[ state ].wordnum
974 for( charid = 1 ; charid <= TRIE_LIST_USED( state ) ; charid++ ) {
975 SV ** const tmp = av_fetch( revcharmap, TRIE_LIST_ITEM(state,charid).forid, 0);
977 PerlIO_printf( Perl_debug_log, "%*s:%3X=%4"UVXf" | ",
979 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
980 PL_colors[0], PL_colors[1],
981 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
982 PERL_PV_ESCAPE_FIRSTCHAR
984 TRIE_LIST_ITEM(state,charid).forid,
985 (UV)TRIE_LIST_ITEM(state,charid).newstate
988 PerlIO_printf(Perl_debug_log, "\n%*s| ",
989 (int)((depth * 2) + 14), "");
992 PerlIO_printf( Perl_debug_log, "\n");
997 Dumps a fully constructed but uncompressed trie in table form.
998 This is the normal DFA style state transition table, with a few
999 twists to facilitate compression later.
1000 Used for debugging make_trie().
1003 S_dump_trie_interim_table(pTHX_ const struct _reg_trie_data *trie,
1004 HV *widecharmap, AV *revcharmap, U32 next_alloc,
1009 SV *sv=sv_newmortal();
1010 int colwidth= widecharmap ? 6 : 4;
1011 GET_RE_DEBUG_FLAGS_DECL;
1013 PERL_ARGS_ASSERT_DUMP_TRIE_INTERIM_TABLE;
1016 print out the table precompression so that we can do a visual check
1017 that they are identical.
1020 PerlIO_printf( Perl_debug_log, "%*sChar : ",(int)depth * 2 + 2,"" );
1022 for( charid = 0 ; charid < trie->uniquecharcount ; charid++ ) {
1023 SV ** const tmp = av_fetch( revcharmap, charid, 0);
1025 PerlIO_printf( Perl_debug_log, "%*s",
1027 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
1028 PL_colors[0], PL_colors[1],
1029 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
1030 PERL_PV_ESCAPE_FIRSTCHAR
1036 PerlIO_printf( Perl_debug_log, "\n%*sState+-",(int)depth * 2 + 2,"" );
1038 for( charid=0 ; charid < trie->uniquecharcount ; charid++ ) {
1039 PerlIO_printf( Perl_debug_log, "%.*s", colwidth,"--------");
1042 PerlIO_printf( Perl_debug_log, "\n" );
1044 for( state=1 ; state < next_alloc ; state += trie->uniquecharcount ) {
1046 PerlIO_printf( Perl_debug_log, "%*s%4"UVXf" : ",
1047 (int)depth * 2 + 2,"",
1048 (UV)TRIE_NODENUM( state ) );
1050 for( charid = 0 ; charid < trie->uniquecharcount ; charid++ ) {
1051 UV v=(UV)SAFE_TRIE_NODENUM( trie->trans[ state + charid ].next );
1053 PerlIO_printf( Perl_debug_log, "%*"UVXf, colwidth, v );
1055 PerlIO_printf( Perl_debug_log, "%*s", colwidth, "." );
1057 if ( ! trie->states[ TRIE_NODENUM( state ) ].wordnum ) {
1058 PerlIO_printf( Perl_debug_log, " (%4"UVXf")\n", (UV)trie->trans[ state ].check );
1060 PerlIO_printf( Perl_debug_log, " (%4"UVXf") W%4X\n", (UV)trie->trans[ state ].check,
1061 trie->states[ TRIE_NODENUM( state ) ].wordnum );
1068 /* make_trie(startbranch,first,last,tail,word_count,flags,depth)
1069 startbranch: the first branch in the whole branch sequence
1070 first : start branch of sequence of branch-exact nodes.
1071 May be the same as startbranch
1072 last : Thing following the last branch.
1073 May be the same as tail.
1074 tail : item following the branch sequence
1075 count : words in the sequence
1076 flags : currently the OP() type we will be building one of /EXACT(|F|Fl)/
1077 depth : indent depth
1079 Inplace optimizes a sequence of 2 or more Branch-Exact nodes into a TRIE node.
1081 A trie is an N'ary tree where the branches are determined by digital
1082 decomposition of the key. IE, at the root node you look up the 1st character and
1083 follow that branch repeat until you find the end of the branches. Nodes can be
1084 marked as "accepting" meaning they represent a complete word. Eg:
1088 would convert into the following structure. Numbers represent states, letters
1089 following numbers represent valid transitions on the letter from that state, if
1090 the number is in square brackets it represents an accepting state, otherwise it
1091 will be in parenthesis.
1093 +-h->+-e->[3]-+-r->(8)-+-s->[9]
1097 (1) +-i->(6)-+-s->[7]
1099 +-s->(3)-+-h->(4)-+-e->[5]
1101 Accept Word Mapping: 3=>1 (he),5=>2 (she), 7=>3 (his), 9=>4 (hers)
1103 This shows that when matching against the string 'hers' we will begin at state 1
1104 read 'h' and move to state 2, read 'e' and move to state 3 which is accepting,
1105 then read 'r' and go to state 8 followed by 's' which takes us to state 9 which
1106 is also accepting. Thus we know that we can match both 'he' and 'hers' with a
1107 single traverse. We store a mapping from accepting to state to which word was
1108 matched, and then when we have multiple possibilities we try to complete the
1109 rest of the regex in the order in which they occured in the alternation.
1111 The only prior NFA like behaviour that would be changed by the TRIE support is
1112 the silent ignoring of duplicate alternations which are of the form:
1114 / (DUPE|DUPE) X? (?{ ... }) Y /x
1116 Thus EVAL blocks follwing a trie may be called a different number of times with
1117 and without the optimisation. With the optimisations dupes will be silently
1118 ignored. This inconsistant behaviour of EVAL type nodes is well established as
1119 the following demonstrates:
1121 'words'=~/(word|word|word)(?{ print $1 })[xyz]/
1123 which prints out 'word' three times, but
1125 'words'=~/(word|word|word)(?{ print $1 })S/
1127 which doesnt print it out at all. This is due to other optimisations kicking in.
1129 Example of what happens on a structural level:
1131 The regexp /(ac|ad|ab)+/ will produce the folowing debug output:
1133 1: CURLYM[1] {1,32767}(18)
1144 This would be optimizable with startbranch=5, first=5, last=16, tail=16
1145 and should turn into:
1147 1: CURLYM[1] {1,32767}(18)
1149 [Words:3 Chars Stored:6 Unique Chars:4 States:5 NCP:1]
1157 Cases where tail != last would be like /(?foo|bar)baz/:
1167 which would be optimizable with startbranch=1, first=1, last=7, tail=8
1168 and would end up looking like:
1171 [Words:2 Chars Stored:6 Unique Chars:5 States:7 NCP:1]
1178 d = uvuni_to_utf8_flags(d, uv, 0);
1180 is the recommended Unicode-aware way of saying
1185 #define TRIE_STORE_REVCHAR \
1188 SV *zlopp = newSV(2); \
1189 unsigned char *flrbbbbb = (unsigned char *) SvPVX(zlopp); \
1190 unsigned const char *const kapow = uvuni_to_utf8(flrbbbbb, uvc & 0xFF); \
1191 SvCUR_set(zlopp, kapow - flrbbbbb); \
1194 av_push(revcharmap, zlopp); \
1196 char ooooff = (char)uvc; \
1197 av_push(revcharmap, newSVpvn(&ooooff, 1)); \
1201 #define TRIE_READ_CHAR STMT_START { \
1205 if ( foldlen > 0 ) { \
1206 uvc = utf8n_to_uvuni( scan, UTF8_MAXLEN, &len, uniflags ); \
1211 uvc = utf8n_to_uvuni( (const U8*)uc, UTF8_MAXLEN, &len, uniflags);\
1212 uvc = to_uni_fold( uvc, foldbuf, &foldlen ); \
1213 foldlen -= UNISKIP( uvc ); \
1214 scan = foldbuf + UNISKIP( uvc ); \
1217 uvc = utf8n_to_uvuni( (const U8*)uc, UTF8_MAXLEN, &len, uniflags);\
1227 #define TRIE_LIST_PUSH(state,fid,ns) STMT_START { \
1228 if ( TRIE_LIST_CUR( state ) >=TRIE_LIST_LEN( state ) ) { \
1229 U32 ging = TRIE_LIST_LEN( state ) *= 2; \
1230 Renew( trie->states[ state ].trans.list, ging, reg_trie_trans_le ); \
1232 TRIE_LIST_ITEM( state, TRIE_LIST_CUR( state ) ).forid = fid; \
1233 TRIE_LIST_ITEM( state, TRIE_LIST_CUR( state ) ).newstate = ns; \
1234 TRIE_LIST_CUR( state )++; \
1237 #define TRIE_LIST_NEW(state) STMT_START { \
1238 Newxz( trie->states[ state ].trans.list, \
1239 4, reg_trie_trans_le ); \
1240 TRIE_LIST_CUR( state ) = 1; \
1241 TRIE_LIST_LEN( state ) = 4; \
1244 #define TRIE_HANDLE_WORD(state) STMT_START { \
1245 U16 dupe= trie->states[ state ].wordnum; \
1246 regnode * const noper_next = regnext( noper ); \
1248 if (trie->wordlen) \
1249 trie->wordlen[ curword ] = wordlen; \
1251 /* store the word for dumping */ \
1253 if (OP(noper) != NOTHING) \
1254 tmp = newSVpvn_utf8(STRING(noper), STR_LEN(noper), UTF); \
1256 tmp = newSVpvn_utf8( "", 0, UTF ); \
1257 av_push( trie_words, tmp ); \
1262 if ( noper_next < tail ) { \
1264 trie->jump = (U16 *) PerlMemShared_calloc( word_count + 1, sizeof(U16) ); \
1265 trie->jump[curword] = (U16)(noper_next - convert); \
1267 jumper = noper_next; \
1269 nextbranch= regnext(cur); \
1273 /* So it's a dupe. This means we need to maintain a */\
1274 /* linked-list from the first to the next. */\
1275 /* we only allocate the nextword buffer when there */\
1276 /* a dupe, so first time we have to do the allocation */\
1277 if (!trie->nextword) \
1278 trie->nextword = (U16 *) \
1279 PerlMemShared_calloc( word_count + 1, sizeof(U16)); \
1280 while ( trie->nextword[dupe] ) \
1281 dupe= trie->nextword[dupe]; \
1282 trie->nextword[dupe]= curword; \
1284 /* we haven't inserted this word yet. */ \
1285 trie->states[ state ].wordnum = curword; \
1290 #define TRIE_TRANS_STATE(state,base,ucharcount,charid,special) \
1291 ( ( base + charid >= ucharcount \
1292 && base + charid < ubound \
1293 && state == trie->trans[ base - ucharcount + charid ].check \
1294 && trie->trans[ base - ucharcount + charid ].next ) \
1295 ? trie->trans[ base - ucharcount + charid ].next \
1296 : ( state==1 ? special : 0 ) \
1300 #define MADE_JUMP_TRIE 2
1301 #define MADE_EXACT_TRIE 4
1304 S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *first, regnode *last, regnode *tail, U32 word_count, U32 flags, U32 depth)
1307 /* first pass, loop through and scan words */
1308 reg_trie_data *trie;
1309 HV *widecharmap = NULL;
1310 AV *revcharmap = newAV();
1312 const U32 uniflags = UTF8_ALLOW_DEFAULT;
1317 regnode *jumper = NULL;
1318 regnode *nextbranch = NULL;
1319 regnode *convert = NULL;
1320 /* we just use folder as a flag in utf8 */
1321 const U8 * const folder = ( flags == EXACTF
1323 : ( flags == EXACTFL
1330 const U32 data_slot = add_data( pRExC_state, 4, "tuuu" );
1331 AV *trie_words = NULL;
1332 /* along with revcharmap, this only used during construction but both are
1333 * useful during debugging so we store them in the struct when debugging.
1336 const U32 data_slot = add_data( pRExC_state, 2, "tu" );
1337 STRLEN trie_charcount=0;
1339 SV *re_trie_maxbuff;
1340 GET_RE_DEBUG_FLAGS_DECL;
1342 PERL_ARGS_ASSERT_MAKE_TRIE;
1344 PERL_UNUSED_ARG(depth);
1347 trie = (reg_trie_data *) PerlMemShared_calloc( 1, sizeof(reg_trie_data) );
1349 trie->startstate = 1;
1350 trie->wordcount = word_count;
1351 RExC_rxi->data->data[ data_slot ] = (void*)trie;
1352 trie->charmap = (U16 *) PerlMemShared_calloc( 256, sizeof(U16) );
1353 if (!(UTF && folder))
1354 trie->bitmap = (char *) PerlMemShared_calloc( ANYOF_BITMAP_SIZE, 1 );
1356 trie_words = newAV();
1359 re_trie_maxbuff = get_sv(RE_TRIE_MAXBUF_NAME, 1);
1360 if (!SvIOK(re_trie_maxbuff)) {
1361 sv_setiv(re_trie_maxbuff, RE_TRIE_MAXBUF_INIT);
1364 PerlIO_printf( Perl_debug_log,
1365 "%*smake_trie start==%d, first==%d, last==%d, tail==%d depth=%d\n",
1366 (int)depth * 2 + 2, "",
1367 REG_NODE_NUM(startbranch),REG_NODE_NUM(first),
1368 REG_NODE_NUM(last), REG_NODE_NUM(tail),
1372 /* Find the node we are going to overwrite */
1373 if ( first == startbranch && OP( last ) != BRANCH ) {
1374 /* whole branch chain */
1377 /* branch sub-chain */
1378 convert = NEXTOPER( first );
1381 /* -- First loop and Setup --
1383 We first traverse the branches and scan each word to determine if it
1384 contains widechars, and how many unique chars there are, this is
1385 important as we have to build a table with at least as many columns as we
1388 We use an array of integers to represent the character codes 0..255
1389 (trie->charmap) and we use a an HV* to store Unicode characters. We use the
1390 native representation of the character value as the key and IV's for the
1393 *TODO* If we keep track of how many times each character is used we can
1394 remap the columns so that the table compression later on is more
1395 efficient in terms of memory by ensuring most common value is in the
1396 middle and the least common are on the outside. IMO this would be better
1397 than a most to least common mapping as theres a decent chance the most
1398 common letter will share a node with the least common, meaning the node
1399 will not be compressable. With a middle is most common approach the worst
1400 case is when we have the least common nodes twice.
1404 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1405 regnode * const noper = NEXTOPER( cur );
1406 const U8 *uc = (U8*)STRING( noper );
1407 const U8 * const e = uc + STR_LEN( noper );
1409 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1410 const U8 *scan = (U8*)NULL;
1411 U32 wordlen = 0; /* required init */
1413 bool set_bit = trie->bitmap ? 1 : 0; /*store the first char in the bitmap?*/
1415 if (OP(noper) == NOTHING) {
1419 if ( set_bit ) /* bitmap only alloced when !(UTF&&Folding) */
1420 TRIE_BITMAP_SET(trie,*uc); /* store the raw first byte
1421 regardless of encoding */
1423 for ( ; uc < e ; uc += len ) {
1424 TRIE_CHARCOUNT(trie)++;
1428 if ( !trie->charmap[ uvc ] ) {
1429 trie->charmap[ uvc ]=( ++trie->uniquecharcount );
1431 trie->charmap[ folder[ uvc ] ] = trie->charmap[ uvc ];
1435 /* store the codepoint in the bitmap, and if its ascii
1436 also store its folded equivelent. */
1437 TRIE_BITMAP_SET(trie,uvc);
1439 /* store the folded codepoint */
1440 if ( folder ) TRIE_BITMAP_SET(trie,folder[ uvc ]);
1443 /* store first byte of utf8 representation of
1444 codepoints in the 127 < uvc < 256 range */
1445 if (127 < uvc && uvc < 192) {
1446 TRIE_BITMAP_SET(trie,194);
1447 } else if (191 < uvc ) {
1448 TRIE_BITMAP_SET(trie,195);
1449 /* && uvc < 256 -- we know uvc is < 256 already */
1452 set_bit = 0; /* We've done our bit :-) */
1457 widecharmap = newHV();
1459 svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 1 );
1462 Perl_croak( aTHX_ "error creating/fetching widecharmap entry for 0x%"UVXf, uvc );
1464 if ( !SvTRUE( *svpp ) ) {
1465 sv_setiv( *svpp, ++trie->uniquecharcount );
1470 if( cur == first ) {
1473 } else if (chars < trie->minlen) {
1475 } else if (chars > trie->maxlen) {
1479 } /* end first pass */
1480 DEBUG_TRIE_COMPILE_r(
1481 PerlIO_printf( Perl_debug_log, "%*sTRIE(%s): W:%d C:%d Uq:%d Min:%d Max:%d\n",
1482 (int)depth * 2 + 2,"",
1483 ( widecharmap ? "UTF8" : "NATIVE" ), (int)word_count,
1484 (int)TRIE_CHARCOUNT(trie), trie->uniquecharcount,
1485 (int)trie->minlen, (int)trie->maxlen )
1487 trie->wordlen = (U32 *) PerlMemShared_calloc( word_count, sizeof(U32) );
1490 We now know what we are dealing with in terms of unique chars and
1491 string sizes so we can calculate how much memory a naive
1492 representation using a flat table will take. If it's over a reasonable
1493 limit (as specified by ${^RE_TRIE_MAXBUF}) we use a more memory
1494 conservative but potentially much slower representation using an array
1497 At the end we convert both representations into the same compressed
1498 form that will be used in regexec.c for matching with. The latter
1499 is a form that cannot be used to construct with but has memory
1500 properties similar to the list form and access properties similar
1501 to the table form making it both suitable for fast searches and
1502 small enough that its feasable to store for the duration of a program.
1504 See the comment in the code where the compressed table is produced
1505 inplace from the flat tabe representation for an explanation of how
1506 the compression works.
1511 if ( (IV)( ( TRIE_CHARCOUNT(trie) + 1 ) * trie->uniquecharcount + 1) > SvIV(re_trie_maxbuff) ) {
1513 Second Pass -- Array Of Lists Representation
1515 Each state will be represented by a list of charid:state records
1516 (reg_trie_trans_le) the first such element holds the CUR and LEN
1517 points of the allocated array. (See defines above).
1519 We build the initial structure using the lists, and then convert
1520 it into the compressed table form which allows faster lookups
1521 (but cant be modified once converted).
1524 STRLEN transcount = 1;
1526 DEBUG_TRIE_COMPILE_MORE_r( PerlIO_printf( Perl_debug_log,
1527 "%*sCompiling trie using list compiler\n",
1528 (int)depth * 2 + 2, ""));
1530 trie->states = (reg_trie_state *)
1531 PerlMemShared_calloc( TRIE_CHARCOUNT(trie) + 2,
1532 sizeof(reg_trie_state) );
1536 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1538 regnode * const noper = NEXTOPER( cur );
1539 U8 *uc = (U8*)STRING( noper );
1540 const U8 * const e = uc + STR_LEN( noper );
1541 U32 state = 1; /* required init */
1542 U16 charid = 0; /* sanity init */
1543 U8 *scan = (U8*)NULL; /* sanity init */
1544 STRLEN foldlen = 0; /* required init */
1545 U32 wordlen = 0; /* required init */
1546 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1548 if (OP(noper) != NOTHING) {
1549 for ( ; uc < e ; uc += len ) {
1554 charid = trie->charmap[ uvc ];
1556 SV** const svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 0);
1560 charid=(U16)SvIV( *svpp );
1563 /* charid is now 0 if we dont know the char read, or nonzero if we do */
1570 if ( !trie->states[ state ].trans.list ) {
1571 TRIE_LIST_NEW( state );
1573 for ( check = 1; check <= TRIE_LIST_USED( state ); check++ ) {
1574 if ( TRIE_LIST_ITEM( state, check ).forid == charid ) {
1575 newstate = TRIE_LIST_ITEM( state, check ).newstate;
1580 newstate = next_alloc++;
1581 TRIE_LIST_PUSH( state, charid, newstate );
1586 Perl_croak( aTHX_ "panic! In trie construction, no char mapping for %"IVdf, uvc );
1590 TRIE_HANDLE_WORD(state);
1592 } /* end second pass */
1594 /* next alloc is the NEXT state to be allocated */
1595 trie->statecount = next_alloc;
1596 trie->states = (reg_trie_state *)
1597 PerlMemShared_realloc( trie->states,
1599 * sizeof(reg_trie_state) );
1601 /* and now dump it out before we compress it */
1602 DEBUG_TRIE_COMPILE_MORE_r(dump_trie_interim_list(trie, widecharmap,
1603 revcharmap, next_alloc,
1607 trie->trans = (reg_trie_trans *)
1608 PerlMemShared_calloc( transcount, sizeof(reg_trie_trans) );
1615 for( state=1 ; state < next_alloc ; state ++ ) {
1619 DEBUG_TRIE_COMPILE_MORE_r(
1620 PerlIO_printf( Perl_debug_log, "tp: %d zp: %d ",tp,zp)
1624 if (trie->states[state].trans.list) {
1625 U16 minid=TRIE_LIST_ITEM( state, 1).forid;
1629 for( idx = 2 ; idx <= TRIE_LIST_USED( state ) ; idx++ ) {
1630 const U16 forid = TRIE_LIST_ITEM( state, idx).forid;
1631 if ( forid < minid ) {
1633 } else if ( forid > maxid ) {
1637 if ( transcount < tp + maxid - minid + 1) {
1639 trie->trans = (reg_trie_trans *)
1640 PerlMemShared_realloc( trie->trans,
1642 * sizeof(reg_trie_trans) );
1643 Zero( trie->trans + (transcount / 2), transcount / 2 , reg_trie_trans );
1645 base = trie->uniquecharcount + tp - minid;
1646 if ( maxid == minid ) {
1648 for ( ; zp < tp ; zp++ ) {
1649 if ( ! trie->trans[ zp ].next ) {
1650 base = trie->uniquecharcount + zp - minid;
1651 trie->trans[ zp ].next = TRIE_LIST_ITEM( state, 1).newstate;
1652 trie->trans[ zp ].check = state;
1658 trie->trans[ tp ].next = TRIE_LIST_ITEM( state, 1).newstate;
1659 trie->trans[ tp ].check = state;
1664 for ( idx=1; idx <= TRIE_LIST_USED( state ) ; idx++ ) {
1665 const U32 tid = base - trie->uniquecharcount + TRIE_LIST_ITEM( state, idx ).forid;
1666 trie->trans[ tid ].next = TRIE_LIST_ITEM( state, idx ).newstate;
1667 trie->trans[ tid ].check = state;
1669 tp += ( maxid - minid + 1 );
1671 Safefree(trie->states[ state ].trans.list);
1674 DEBUG_TRIE_COMPILE_MORE_r(
1675 PerlIO_printf( Perl_debug_log, " base: %d\n",base);
1678 trie->states[ state ].trans.base=base;
1680 trie->lasttrans = tp + 1;
1684 Second Pass -- Flat Table Representation.
1686 we dont use the 0 slot of either trans[] or states[] so we add 1 to each.
1687 We know that we will need Charcount+1 trans at most to store the data
1688 (one row per char at worst case) So we preallocate both structures
1689 assuming worst case.
1691 We then construct the trie using only the .next slots of the entry
1694 We use the .check field of the first entry of the node temporarily to
1695 make compression both faster and easier by keeping track of how many non
1696 zero fields are in the node.
1698 Since trans are numbered from 1 any 0 pointer in the table is a FAIL
1701 There are two terms at use here: state as a TRIE_NODEIDX() which is a
1702 number representing the first entry of the node, and state as a
1703 TRIE_NODENUM() which is the trans number. state 1 is TRIE_NODEIDX(1) and
1704 TRIE_NODENUM(1), state 2 is TRIE_NODEIDX(2) and TRIE_NODENUM(3) if there
1705 are 2 entrys per node. eg:
1713 The table is internally in the right hand, idx form. However as we also
1714 have to deal with the states array which is indexed by nodenum we have to
1715 use TRIE_NODENUM() to convert.
1718 DEBUG_TRIE_COMPILE_MORE_r( PerlIO_printf( Perl_debug_log,
1719 "%*sCompiling trie using table compiler\n",
1720 (int)depth * 2 + 2, ""));
1722 trie->trans = (reg_trie_trans *)
1723 PerlMemShared_calloc( ( TRIE_CHARCOUNT(trie) + 1 )
1724 * trie->uniquecharcount + 1,
1725 sizeof(reg_trie_trans) );
1726 trie->states = (reg_trie_state *)
1727 PerlMemShared_calloc( TRIE_CHARCOUNT(trie) + 2,
1728 sizeof(reg_trie_state) );
1729 next_alloc = trie->uniquecharcount + 1;
1732 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1734 regnode * const noper = NEXTOPER( cur );
1735 const U8 *uc = (U8*)STRING( noper );
1736 const U8 * const e = uc + STR_LEN( noper );
1738 U32 state = 1; /* required init */
1740 U16 charid = 0; /* sanity init */
1741 U32 accept_state = 0; /* sanity init */
1742 U8 *scan = (U8*)NULL; /* sanity init */
1744 STRLEN foldlen = 0; /* required init */
1745 U32 wordlen = 0; /* required init */
1746 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1748 if ( OP(noper) != NOTHING ) {
1749 for ( ; uc < e ; uc += len ) {
1754 charid = trie->charmap[ uvc ];
1756 SV* const * const svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 0);
1757 charid = svpp ? (U16)SvIV(*svpp) : 0;
1761 if ( !trie->trans[ state + charid ].next ) {
1762 trie->trans[ state + charid ].next = next_alloc;
1763 trie->trans[ state ].check++;
1764 next_alloc += trie->uniquecharcount;
1766 state = trie->trans[ state + charid ].next;
1768 Perl_croak( aTHX_ "panic! In trie construction, no char mapping for %"IVdf, uvc );
1770 /* charid is now 0 if we dont know the char read, or nonzero if we do */
1773 accept_state = TRIE_NODENUM( state );
1774 TRIE_HANDLE_WORD(accept_state);
1776 } /* end second pass */
1778 /* and now dump it out before we compress it */
1779 DEBUG_TRIE_COMPILE_MORE_r(dump_trie_interim_table(trie, widecharmap,
1781 next_alloc, depth+1));
1785 * Inplace compress the table.*
1787 For sparse data sets the table constructed by the trie algorithm will
1788 be mostly 0/FAIL transitions or to put it another way mostly empty.
1789 (Note that leaf nodes will not contain any transitions.)
1791 This algorithm compresses the tables by eliminating most such
1792 transitions, at the cost of a modest bit of extra work during lookup:
1794 - Each states[] entry contains a .base field which indicates the
1795 index in the state[] array wheres its transition data is stored.
1797 - If .base is 0 there are no valid transitions from that node.
1799 - If .base is nonzero then charid is added to it to find an entry in
1802 -If trans[states[state].base+charid].check!=state then the
1803 transition is taken to be a 0/Fail transition. Thus if there are fail
1804 transitions at the front of the node then the .base offset will point
1805 somewhere inside the previous nodes data (or maybe even into a node
1806 even earlier), but the .check field determines if the transition is
1810 The following process inplace converts the table to the compressed
1811 table: We first do not compress the root node 1,and mark its all its
1812 .check pointers as 1 and set its .base pointer as 1 as well. This
1813 allows to do a DFA construction from the compressed table later, and
1814 ensures that any .base pointers we calculate later are greater than
1817 - We set 'pos' to indicate the first entry of the second node.
1819 - We then iterate over the columns of the node, finding the first and
1820 last used entry at l and m. We then copy l..m into pos..(pos+m-l),
1821 and set the .check pointers accordingly, and advance pos
1822 appropriately and repreat for the next node. Note that when we copy
1823 the next pointers we have to convert them from the original
1824 NODEIDX form to NODENUM form as the former is not valid post
1827 - If a node has no transitions used we mark its base as 0 and do not
1828 advance the pos pointer.
1830 - If a node only has one transition we use a second pointer into the
1831 structure to fill in allocated fail transitions from other states.
1832 This pointer is independent of the main pointer and scans forward
1833 looking for null transitions that are allocated to a state. When it
1834 finds one it writes the single transition into the "hole". If the
1835 pointer doesnt find one the single transition is appended as normal.
1837 - Once compressed we can Renew/realloc the structures to release the
1840 See "Table-Compression Methods" in sec 3.9 of the Red Dragon,
1841 specifically Fig 3.47 and the associated pseudocode.
1845 const U32 laststate = TRIE_NODENUM( next_alloc );
1848 trie->statecount = laststate;
1850 for ( state = 1 ; state < laststate ; state++ ) {
1852 const U32 stateidx = TRIE_NODEIDX( state );
1853 const U32 o_used = trie->trans[ stateidx ].check;
1854 U32 used = trie->trans[ stateidx ].check;
1855 trie->trans[ stateidx ].check = 0;
1857 for ( charid = 0 ; used && charid < trie->uniquecharcount ; charid++ ) {
1858 if ( flag || trie->trans[ stateidx + charid ].next ) {
1859 if ( trie->trans[ stateidx + charid ].next ) {
1861 for ( ; zp < pos ; zp++ ) {
1862 if ( ! trie->trans[ zp ].next ) {
1866 trie->states[ state ].trans.base = zp + trie->uniquecharcount - charid ;
1867 trie->trans[ zp ].next = SAFE_TRIE_NODENUM( trie->trans[ stateidx + charid ].next );
1868 trie->trans[ zp ].check = state;
1869 if ( ++zp > pos ) pos = zp;
1876 trie->states[ state ].trans.base = pos + trie->uniquecharcount - charid ;
1878 trie->trans[ pos ].next = SAFE_TRIE_NODENUM( trie->trans[ stateidx + charid ].next );
1879 trie->trans[ pos ].check = state;
1884 trie->lasttrans = pos + 1;
1885 trie->states = (reg_trie_state *)
1886 PerlMemShared_realloc( trie->states, laststate
1887 * sizeof(reg_trie_state) );
1888 DEBUG_TRIE_COMPILE_MORE_r(
1889 PerlIO_printf( Perl_debug_log,
1890 "%*sAlloc: %d Orig: %"IVdf" elements, Final:%"IVdf". Savings of %%%5.2f\n",
1891 (int)depth * 2 + 2,"",
1892 (int)( ( TRIE_CHARCOUNT(trie) + 1 ) * trie->uniquecharcount + 1 ),
1895 ( ( next_alloc - pos ) * 100 ) / (double)next_alloc );
1898 } /* end table compress */
1900 DEBUG_TRIE_COMPILE_MORE_r(
1901 PerlIO_printf(Perl_debug_log, "%*sStatecount:%"UVxf" Lasttrans:%"UVxf"\n",
1902 (int)depth * 2 + 2, "",
1903 (UV)trie->statecount,
1904 (UV)trie->lasttrans)
1906 /* resize the trans array to remove unused space */
1907 trie->trans = (reg_trie_trans *)
1908 PerlMemShared_realloc( trie->trans, trie->lasttrans
1909 * sizeof(reg_trie_trans) );
1911 /* and now dump out the compressed format */
1912 DEBUG_TRIE_COMPILE_r(dump_trie(trie, widecharmap, revcharmap, depth+1));
1914 { /* Modify the program and insert the new TRIE node*/
1915 U8 nodetype =(U8)(flags & 0xFF);
1919 regnode *optimize = NULL;
1920 #ifdef RE_TRACK_PATTERN_OFFSETS
1923 U32 mjd_nodelen = 0;
1924 #endif /* RE_TRACK_PATTERN_OFFSETS */
1925 #endif /* DEBUGGING */
1927 This means we convert either the first branch or the first Exact,
1928 depending on whether the thing following (in 'last') is a branch
1929 or not and whther first is the startbranch (ie is it a sub part of
1930 the alternation or is it the whole thing.)
1931 Assuming its a sub part we conver the EXACT otherwise we convert
1932 the whole branch sequence, including the first.
1934 /* Find the node we are going to overwrite */
1935 if ( first != startbranch || OP( last ) == BRANCH ) {
1936 /* branch sub-chain */
1937 NEXT_OFF( first ) = (U16)(last - first);
1938 #ifdef RE_TRACK_PATTERN_OFFSETS
1940 mjd_offset= Node_Offset((convert));
1941 mjd_nodelen= Node_Length((convert));
1944 /* whole branch chain */
1946 #ifdef RE_TRACK_PATTERN_OFFSETS
1949 const regnode *nop = NEXTOPER( convert );
1950 mjd_offset= Node_Offset((nop));
1951 mjd_nodelen= Node_Length((nop));
1955 PerlIO_printf(Perl_debug_log, "%*sMJD offset:%"UVuf" MJD length:%"UVuf"\n",
1956 (int)depth * 2 + 2, "",
1957 (UV)mjd_offset, (UV)mjd_nodelen)
1960 /* But first we check to see if there is a common prefix we can
1961 split out as an EXACT and put in front of the TRIE node. */
1962 trie->startstate= 1;
1963 if ( trie->bitmap && !widecharmap && !trie->jump ) {
1965 for ( state = 1 ; state < trie->statecount-1 ; state++ ) {
1969 const U32 base = trie->states[ state ].trans.base;
1971 if ( trie->states[state].wordnum )
1974 for ( ofs = 0 ; ofs < trie->uniquecharcount ; ofs++ ) {
1975 if ( ( base + ofs >= trie->uniquecharcount ) &&
1976 ( base + ofs - trie->uniquecharcount < trie->lasttrans ) &&
1977 trie->trans[ base + ofs - trie->uniquecharcount ].check == state )
1979 if ( ++count > 1 ) {
1980 SV **tmp = av_fetch( revcharmap, ofs, 0);
1981 const U8 *ch = (U8*)SvPV_nolen_const( *tmp );
1982 if ( state == 1 ) break;
1984 Zero(trie->bitmap, ANYOF_BITMAP_SIZE, char);
1986 PerlIO_printf(Perl_debug_log,
1987 "%*sNew Start State=%"UVuf" Class: [",
1988 (int)depth * 2 + 2, "",
1991 SV ** const tmp = av_fetch( revcharmap, idx, 0);
1992 const U8 * const ch = (U8*)SvPV_nolen_const( *tmp );
1994 TRIE_BITMAP_SET(trie,*ch);
1996 TRIE_BITMAP_SET(trie, folder[ *ch ]);
1998 PerlIO_printf(Perl_debug_log, (char*)ch)
2002 TRIE_BITMAP_SET(trie,*ch);
2004 TRIE_BITMAP_SET(trie,folder[ *ch ]);
2005 DEBUG_OPTIMISE_r(PerlIO_printf( Perl_debug_log,"%s", ch));
2011 SV **tmp = av_fetch( revcharmap, idx, 0);
2013 char *ch = SvPV( *tmp, len );
2015 SV *sv=sv_newmortal();
2016 PerlIO_printf( Perl_debug_log,
2017 "%*sPrefix State: %"UVuf" Idx:%"UVuf" Char='%s'\n",
2018 (int)depth * 2 + 2, "",
2020 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), 6,
2021 PL_colors[0], PL_colors[1],
2022 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
2023 PERL_PV_ESCAPE_FIRSTCHAR
2028 OP( convert ) = nodetype;
2029 str=STRING(convert);
2032 STR_LEN(convert) += len;
2038 DEBUG_OPTIMISE_r(PerlIO_printf( Perl_debug_log,"]\n"));
2044 regnode *n = convert+NODE_SZ_STR(convert);
2045 NEXT_OFF(convert) = NODE_SZ_STR(convert);
2046 trie->startstate = state;
2047 trie->minlen -= (state - 1);
2048 trie->maxlen -= (state - 1);
2050 /* At least the UNICOS C compiler choked on this
2051 * being argument to DEBUG_r(), so let's just have
2054 #ifdef PERL_EXT_RE_BUILD
2060 regnode *fix = convert;
2061 U32 word = trie->wordcount;
2063 Set_Node_Offset_Length(convert, mjd_offset, state - 1);
2064 while( ++fix < n ) {
2065 Set_Node_Offset_Length(fix, 0, 0);
2068 SV ** const tmp = av_fetch( trie_words, word, 0 );
2070 if ( STR_LEN(convert) <= SvCUR(*tmp) )
2071 sv_chop(*tmp, SvPV_nolen(*tmp) + STR_LEN(convert));
2073 sv_chop(*tmp, SvPV_nolen(*tmp) + SvCUR(*tmp));
2081 NEXT_OFF(convert) = (U16)(tail - convert);
2082 DEBUG_r(optimize= n);
2088 if ( trie->maxlen ) {
2089 NEXT_OFF( convert ) = (U16)(tail - convert);
2090 ARG_SET( convert, data_slot );
2091 /* Store the offset to the first unabsorbed branch in
2092 jump[0], which is otherwise unused by the jump logic.
2093 We use this when dumping a trie and during optimisation. */
2095 trie->jump[0] = (U16)(nextbranch - convert);
2098 if ( !trie->states[trie->startstate].wordnum && trie->bitmap &&
2099 ( (char *)jumper - (char *)convert) >= (int)sizeof(struct regnode_charclass) )
2101 OP( convert ) = TRIEC;
2102 Copy(trie->bitmap, ((struct regnode_charclass *)convert)->bitmap, ANYOF_BITMAP_SIZE, char);
2103 PerlMemShared_free(trie->bitmap);
2106 OP( convert ) = TRIE;
2108 /* store the type in the flags */
2109 convert->flags = nodetype;
2113 + regarglen[ OP( convert ) ];
2115 /* XXX We really should free up the resource in trie now,
2116 as we won't use them - (which resources?) dmq */
2118 /* needed for dumping*/
2119 DEBUG_r(if (optimize) {
2120 regnode *opt = convert;
2122 while ( ++opt < optimize) {
2123 Set_Node_Offset_Length(opt,0,0);
2126 Try to clean up some of the debris left after the
2129 while( optimize < jumper ) {
2130 mjd_nodelen += Node_Length((optimize));
2131 OP( optimize ) = OPTIMIZED;
2132 Set_Node_Offset_Length(optimize,0,0);
2135 Set_Node_Offset_Length(convert,mjd_offset,mjd_nodelen);
2137 } /* end node insert */
2138 RExC_rxi->data->data[ data_slot + 1 ] = (void*)widecharmap;
2140 RExC_rxi->data->data[ data_slot + TRIE_WORDS_OFFSET ] = (void*)trie_words;
2141 RExC_rxi->data->data[ data_slot + 3 ] = (void*)revcharmap;
2143 SvREFCNT_dec(revcharmap);
2147 : trie->startstate>1
2153 S_make_trie_failtable(pTHX_ RExC_state_t *pRExC_state, regnode *source, regnode *stclass, U32 depth)
2155 /* The Trie is constructed and compressed now so we can build a fail array now if its needed
2157 This is basically the Aho-Corasick algorithm. Its from exercise 3.31 and 3.32 in the
2158 "Red Dragon" -- Compilers, principles, techniques, and tools. Aho, Sethi, Ullman 1985/88
2161 We find the fail state for each state in the trie, this state is the longest proper
2162 suffix of the current states 'word' that is also a proper prefix of another word in our
2163 trie. State 1 represents the word '' and is the thus the default fail state. This allows
2164 the DFA not to have to restart after its tried and failed a word at a given point, it
2165 simply continues as though it had been matching the other word in the first place.
2167 'abcdgu'=~/abcdefg|cdgu/
2168 When we get to 'd' we are still matching the first word, we would encounter 'g' which would
2169 fail, which would bring use to the state representing 'd' in the second word where we would
2170 try 'g' and succeed, prodceding to match 'cdgu'.
2172 /* add a fail transition */
2173 const U32 trie_offset = ARG(source);
2174 reg_trie_data *trie=(reg_trie_data *)RExC_rxi->data->data[trie_offset];
2176 const U32 ucharcount = trie->uniquecharcount;
2177 const U32 numstates = trie->statecount;
2178 const U32 ubound = trie->lasttrans + ucharcount;
2182 U32 base = trie->states[ 1 ].trans.base;
2185 const U32 data_slot = add_data( pRExC_state, 1, "T" );
2186 GET_RE_DEBUG_FLAGS_DECL;
2188 PERL_ARGS_ASSERT_MAKE_TRIE_FAILTABLE;
2190 PERL_UNUSED_ARG(depth);
2194 ARG_SET( stclass, data_slot );
2195 aho = (reg_ac_data *) PerlMemShared_calloc( 1, sizeof(reg_ac_data) );
2196 RExC_rxi->data->data[ data_slot ] = (void*)aho;
2197 aho->trie=trie_offset;
2198 aho->states=(reg_trie_state *)PerlMemShared_malloc( numstates * sizeof(reg_trie_state) );
2199 Copy( trie->states, aho->states, numstates, reg_trie_state );
2200 Newxz( q, numstates, U32);
2201 aho->fail = (U32 *) PerlMemShared_calloc( numstates, sizeof(U32) );
2204 /* initialize fail[0..1] to be 1 so that we always have
2205 a valid final fail state */
2206 fail[ 0 ] = fail[ 1 ] = 1;
2208 for ( charid = 0; charid < ucharcount ; charid++ ) {
2209 const U32 newstate = TRIE_TRANS_STATE( 1, base, ucharcount, charid, 0 );
2211 q[ q_write ] = newstate;
2212 /* set to point at the root */
2213 fail[ q[ q_write++ ] ]=1;
2216 while ( q_read < q_write) {
2217 const U32 cur = q[ q_read++ % numstates ];
2218 base = trie->states[ cur ].trans.base;
2220 for ( charid = 0 ; charid < ucharcount ; charid++ ) {
2221 const U32 ch_state = TRIE_TRANS_STATE( cur, base, ucharcount, charid, 1 );
2223 U32 fail_state = cur;
2226 fail_state = fail[ fail_state ];
2227 fail_base = aho->states[ fail_state ].trans.base;
2228 } while ( !TRIE_TRANS_STATE( fail_state, fail_base, ucharcount, charid, 1 ) );
2230 fail_state = TRIE_TRANS_STATE( fail_state, fail_base, ucharcount, charid, 1 );
2231 fail[ ch_state ] = fail_state;
2232 if ( !aho->states[ ch_state ].wordnum && aho->states[ fail_state ].wordnum )
2234 aho->states[ ch_state ].wordnum = aho->states[ fail_state ].wordnum;
2236 q[ q_write++ % numstates] = ch_state;
2240 /* restore fail[0..1] to 0 so that we "fall out" of the AC loop
2241 when we fail in state 1, this allows us to use the
2242 charclass scan to find a valid start char. This is based on the principle
2243 that theres a good chance the string being searched contains lots of stuff
2244 that cant be a start char.
2246 fail[ 0 ] = fail[ 1 ] = 0;
2247 DEBUG_TRIE_COMPILE_r({
2248 PerlIO_printf(Perl_debug_log,
2249 "%*sStclass Failtable (%"UVuf" states): 0",
2250 (int)(depth * 2), "", (UV)numstates
2252 for( q_read=1; q_read<numstates; q_read++ ) {
2253 PerlIO_printf(Perl_debug_log, ", %"UVuf, (UV)fail[q_read]);
2255 PerlIO_printf(Perl_debug_log, "\n");
2258 /*RExC_seen |= REG_SEEN_TRIEDFA;*/
2263 * There are strange code-generation bugs caused on sparc64 by gcc-2.95.2.
2264 * These need to be revisited when a newer toolchain becomes available.
2266 #if defined(__sparc64__) && defined(__GNUC__)
2267 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
2268 # undef SPARC64_GCC_WORKAROUND
2269 # define SPARC64_GCC_WORKAROUND 1
2273 #define DEBUG_PEEP(str,scan,depth) \
2274 DEBUG_OPTIMISE_r({if (scan){ \
2275 SV * const mysv=sv_newmortal(); \
2276 regnode *Next = regnext(scan); \
2277 regprop(RExC_rx, mysv, scan); \
2278 PerlIO_printf(Perl_debug_log, "%*s" str ">%3d: %s (%d)\n", \
2279 (int)depth*2, "", REG_NODE_NUM(scan), SvPV_nolen_const(mysv),\
2280 Next ? (REG_NODE_NUM(Next)) : 0 ); \
2287 #define JOIN_EXACT(scan,min,flags) \
2288 if (PL_regkind[OP(scan)] == EXACT) \
2289 join_exact(pRExC_state,(scan),(min),(flags),NULL,depth+1)
2292 S_join_exact(pTHX_ RExC_state_t *pRExC_state, regnode *scan, I32 *min, U32 flags,regnode *val, U32 depth) {
2293 /* Merge several consecutive EXACTish nodes into one. */
2294 regnode *n = regnext(scan);
2296 regnode *next = scan + NODE_SZ_STR(scan);
2300 regnode *stop = scan;
2301 GET_RE_DEBUG_FLAGS_DECL;
2303 PERL_UNUSED_ARG(depth);
2306 PERL_ARGS_ASSERT_JOIN_EXACT;
2307 #ifndef EXPERIMENTAL_INPLACESCAN
2308 PERL_UNUSED_ARG(flags);
2309 PERL_UNUSED_ARG(val);
2311 DEBUG_PEEP("join",scan,depth);
2313 /* Skip NOTHING, merge EXACT*. */
2315 ( PL_regkind[OP(n)] == NOTHING ||
2316 (stringok && (OP(n) == OP(scan))))
2318 && NEXT_OFF(scan) + NEXT_OFF(n) < I16_MAX) {
2320 if (OP(n) == TAIL || n > next)
2322 if (PL_regkind[OP(n)] == NOTHING) {
2323 DEBUG_PEEP("skip:",n,depth);
2324 NEXT_OFF(scan) += NEXT_OFF(n);
2325 next = n + NODE_STEP_REGNODE;
2332 else if (stringok) {
2333 const unsigned int oldl = STR_LEN(scan);
2334 regnode * const nnext = regnext(n);
2336 DEBUG_PEEP("merg",n,depth);
2339 if (oldl + STR_LEN(n) > U8_MAX)
2341 NEXT_OFF(scan) += NEXT_OFF(n);
2342 STR_LEN(scan) += STR_LEN(n);
2343 next = n + NODE_SZ_STR(n);
2344 /* Now we can overwrite *n : */
2345 Move(STRING(n), STRING(scan) + oldl, STR_LEN(n), char);
2353 #ifdef EXPERIMENTAL_INPLACESCAN
2354 if (flags && !NEXT_OFF(n)) {
2355 DEBUG_PEEP("atch", val, depth);
2356 if (reg_off_by_arg[OP(n)]) {
2357 ARG_SET(n, val - n);
2360 NEXT_OFF(n) = val - n;
2367 if (UTF && ( OP(scan) == EXACTF ) && ( STR_LEN(scan) >= 6 ) ) {
2369 Two problematic code points in Unicode casefolding of EXACT nodes:
2371 U+0390 - GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS
2372 U+03B0 - GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS
2378 U+03B9 U+0308 U+0301 0xCE 0xB9 0xCC 0x88 0xCC 0x81
2379 U+03C5 U+0308 U+0301 0xCF 0x85 0xCC 0x88 0xCC 0x81
2381 This means that in case-insensitive matching (or "loose matching",
2382 as Unicode calls it), an EXACTF of length six (the UTF-8 encoded byte
2383 length of the above casefolded versions) can match a target string
2384 of length two (the byte length of UTF-8 encoded U+0390 or U+03B0).
2385 This would rather mess up the minimum length computation.
2387 What we'll do is to look for the tail four bytes, and then peek
2388 at the preceding two bytes to see whether we need to decrease
2389 the minimum length by four (six minus two).
2391 Thanks to the design of UTF-8, there cannot be false matches:
2392 A sequence of valid UTF-8 bytes cannot be a subsequence of
2393 another valid sequence of UTF-8 bytes.
2396 char * const s0 = STRING(scan), *s, *t;
2397 char * const s1 = s0 + STR_LEN(scan) - 1;
2398 char * const s2 = s1 - 4;
2399 #ifdef EBCDIC /* RD tunifold greek 0390 and 03B0 */
2400 const char t0[] = "\xaf\x49\xaf\x42";
2402 const char t0[] = "\xcc\x88\xcc\x81";
2404 const char * const t1 = t0 + 3;
2407 s < s2 && (t = ninstr(s, s1, t0, t1));
2410 if (((U8)t[-1] == 0x68 && (U8)t[-2] == 0xB4) ||
2411 ((U8)t[-1] == 0x46 && (U8)t[-2] == 0xB5))
2413 if (((U8)t[-1] == 0xB9 && (U8)t[-2] == 0xCE) ||
2414 ((U8)t[-1] == 0x85 && (U8)t[-2] == 0xCF))
2422 n = scan + NODE_SZ_STR(scan);
2424 if (PL_regkind[OP(n)] != NOTHING || OP(n) == NOTHING) {
2431 DEBUG_OPTIMISE_r(if (merged){DEBUG_PEEP("finl",scan,depth)});
2435 /* REx optimizer. Converts nodes into quickier variants "in place".
2436 Finds fixed substrings. */
2438 /* Stops at toplevel WHILEM as well as at "last". At end *scanp is set
2439 to the position after last scanned or to NULL. */
2441 #define INIT_AND_WITHP \
2442 assert(!and_withp); \
2443 Newx(and_withp,1,struct regnode_charclass_class); \
2444 SAVEFREEPV(and_withp)
2446 /* this is a chain of data about sub patterns we are processing that
2447 need to be handled seperately/specially in study_chunk. Its so
2448 we can simulate recursion without losing state. */
2450 typedef struct scan_frame {
2451 regnode *last; /* last node to process in this frame */
2452 regnode *next; /* next node to process when last is reached */
2453 struct scan_frame *prev; /*previous frame*/
2454 I32 stop; /* what stopparen do we use */
2458 #define SCAN_COMMIT(s, data, m) scan_commit(s, data, m, is_inf)
2460 #define CASE_SYNST_FNC(nAmE) \
2462 if (flags & SCF_DO_STCLASS_AND) { \
2463 for (value = 0; value < 256; value++) \
2464 if (!is_ ## nAmE ## _cp(value)) \
2465 ANYOF_BITMAP_CLEAR(data->start_class, value); \
2468 for (value = 0; value < 256; value++) \
2469 if (is_ ## nAmE ## _cp(value)) \
2470 ANYOF_BITMAP_SET(data->start_class, value); \
2474 if (flags & SCF_DO_STCLASS_AND) { \
2475 for (value = 0; value < 256; value++) \
2476 if (is_ ## nAmE ## _cp(value)) \
2477 ANYOF_BITMAP_CLEAR(data->start_class, value); \
2480 for (value = 0; value < 256; value++) \
2481 if (!is_ ## nAmE ## _cp(value)) \
2482 ANYOF_BITMAP_SET(data->start_class, value); \
2489 S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp,
2490 I32 *minlenp, I32 *deltap,
2495 struct regnode_charclass_class *and_withp,
2496 U32 flags, U32 depth)
2497 /* scanp: Start here (read-write). */
2498 /* deltap: Write maxlen-minlen here. */
2499 /* last: Stop before this one. */
2500 /* data: string data about the pattern */
2501 /* stopparen: treat close N as END */
2502 /* recursed: which subroutines have we recursed into */
2503 /* and_withp: Valid if flags & SCF_DO_STCLASS_OR */
2506 I32 min = 0, pars = 0, code;
2507 regnode *scan = *scanp, *next;
2509 int is_inf = (flags & SCF_DO_SUBSTR) && (data->flags & SF_IS_INF);
2510 int is_inf_internal = 0; /* The studied chunk is infinite */
2511 I32 is_par = OP(scan) == OPEN ? ARG(scan) : 0;
2512 scan_data_t data_fake;
2513 SV *re_trie_maxbuff = NULL;
2514 regnode *first_non_open = scan;
2515 I32 stopmin = I32_MAX;
2516 scan_frame *frame = NULL;
2517 GET_RE_DEBUG_FLAGS_DECL;
2519 PERL_ARGS_ASSERT_STUDY_CHUNK;
2522 StructCopy(&zero_scan_data, &data_fake, scan_data_t);
2526 while (first_non_open && OP(first_non_open) == OPEN)
2527 first_non_open=regnext(first_non_open);
2532 while ( scan && OP(scan) != END && scan < last ){
2533 /* Peephole optimizer: */
2534 DEBUG_STUDYDATA("Peep:", data,depth);
2535 DEBUG_PEEP("Peep",scan,depth);
2536 JOIN_EXACT(scan,&min,0);
2538 /* Follow the next-chain of the current node and optimize
2539 away all the NOTHINGs from it. */
2540 if (OP(scan) != CURLYX) {
2541 const int max = (reg_off_by_arg[OP(scan)]
2543 /* I32 may be smaller than U16 on CRAYs! */
2544 : (I32_MAX < U16_MAX ? I32_MAX : U16_MAX));
2545 int off = (reg_off_by_arg[OP(scan)] ? ARG(scan) : NEXT_OFF(scan));
2549 /* Skip NOTHING and LONGJMP. */
2550 while ((n = regnext(n))
2551 && ((PL_regkind[OP(n)] == NOTHING && (noff = NEXT_OFF(n)))
2552 || ((OP(n) == LONGJMP) && (noff = ARG(n))))
2553 && off + noff < max)
2555 if (reg_off_by_arg[OP(scan)])
2558 NEXT_OFF(scan) = off;
2563 /* The principal pseudo-switch. Cannot be a switch, since we
2564 look into several different things. */
2565 if (OP(scan) == BRANCH || OP(scan) == BRANCHJ
2566 || OP(scan) == IFTHEN) {
2567 next = regnext(scan);
2569 /* demq: the op(next)==code check is to see if we have "branch-branch" AFAICT */
2571 if (OP(next) == code || code == IFTHEN) {
2572 /* NOTE - There is similar code to this block below for handling
2573 TRIE nodes on a re-study. If you change stuff here check there
2575 I32 max1 = 0, min1 = I32_MAX, num = 0;
2576 struct regnode_charclass_class accum;
2577 regnode * const startbranch=scan;
2579 if (flags & SCF_DO_SUBSTR)
2580 SCAN_COMMIT(pRExC_state, data, minlenp); /* Cannot merge strings after this. */
2581 if (flags & SCF_DO_STCLASS)
2582 cl_init_zero(pRExC_state, &accum);
2584 while (OP(scan) == code) {
2585 I32 deltanext, minnext, f = 0, fake;
2586 struct regnode_charclass_class this_class;
2589 data_fake.flags = 0;
2591 data_fake.whilem_c = data->whilem_c;
2592 data_fake.last_closep = data->last_closep;
2595 data_fake.last_closep = &fake;
2597 data_fake.pos_delta = delta;
2598 next = regnext(scan);
2599 scan = NEXTOPER(scan);
2601 scan = NEXTOPER(scan);
2602 if (flags & SCF_DO_STCLASS) {
2603 cl_init(pRExC_state, &this_class);
2604 data_fake.start_class = &this_class;
2605 f = SCF_DO_STCLASS_AND;
2607 if (flags & SCF_WHILEM_VISITED_POS)
2608 f |= SCF_WHILEM_VISITED_POS;
2610 /* we suppose the run is continuous, last=next...*/
2611 minnext = study_chunk(pRExC_state, &scan, minlenp, &deltanext,
2613 stopparen, recursed, NULL, f,depth+1);
2616 if (max1 < minnext + deltanext)
2617 max1 = minnext + deltanext;
2618 if (deltanext == I32_MAX)
2619 is_inf = is_inf_internal = 1;
2621 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
2623 if (data_fake.flags & SCF_SEEN_ACCEPT) {
2624 if ( stopmin > minnext)
2625 stopmin = min + min1;
2626 flags &= ~SCF_DO_SUBSTR;
2628 data->flags |= SCF_SEEN_ACCEPT;
2631 if (data_fake.flags & SF_HAS_EVAL)
2632 data->flags |= SF_HAS_EVAL;
2633 data->whilem_c = data_fake.whilem_c;
2635 if (flags & SCF_DO_STCLASS)
2636 cl_or(pRExC_state, &accum, &this_class);
2638 if (code == IFTHEN && num < 2) /* Empty ELSE branch */
2640 if (flags & SCF_DO_SUBSTR) {
2641 data->pos_min += min1;
2642 data->pos_delta += max1 - min1;
2643 if (max1 != min1 || is_inf)
2644 data->longest = &(data->longest_float);
2647 delta += max1 - min1;
2648 if (flags & SCF_DO_STCLASS_OR) {
2649 cl_or(pRExC_state, data->start_class, &accum);
2651 cl_and(data->start_class, and_withp);
2652 flags &= ~SCF_DO_STCLASS;
2655 else if (flags & SCF_DO_STCLASS_AND) {
2657 cl_and(data->start_class, &accum);
2658 flags &= ~SCF_DO_STCLASS;
2661 /* Switch to OR mode: cache the old value of
2662 * data->start_class */
2664 StructCopy(data->start_class, and_withp,
2665 struct regnode_charclass_class);
2666 flags &= ~SCF_DO_STCLASS_AND;
2667 StructCopy(&accum, data->start_class,
2668 struct regnode_charclass_class);
2669 flags |= SCF_DO_STCLASS_OR;
2670 data->start_class->flags |= ANYOF_EOS;
2674 if (PERL_ENABLE_TRIE_OPTIMISATION && OP( startbranch ) == BRANCH ) {
2677 Assuming this was/is a branch we are dealing with: 'scan' now
2678 points at the item that follows the branch sequence, whatever
2679 it is. We now start at the beginning of the sequence and look
2686 which would be constructed from a pattern like /A|LIST|OF|WORDS/
2688 If we can find such a subseqence we need to turn the first
2689 element into a trie and then add the subsequent branch exact
2690 strings to the trie.
2694 1. patterns where the whole set of branch can be converted.
2696 2. patterns where only a subset can be converted.
2698 In case 1 we can replace the whole set with a single regop
2699 for the trie. In case 2 we need to keep the start and end
2702 'BRANCH EXACT; BRANCH EXACT; BRANCH X'
2703 becomes BRANCH TRIE; BRANCH X;
2705 There is an additional case, that being where there is a
2706 common prefix, which gets split out into an EXACT like node
2707 preceding the TRIE node.
2709 If x(1..n)==tail then we can do a simple trie, if not we make
2710 a "jump" trie, such that when we match the appropriate word
2711 we "jump" to the appopriate tail node. Essentailly we turn
2712 a nested if into a case structure of sorts.
2717 if (!re_trie_maxbuff) {
2718 re_trie_maxbuff = get_sv(RE_TRIE_MAXBUF_NAME, 1);
2719 if (!SvIOK(re_trie_maxbuff))
2720 sv_setiv(re_trie_maxbuff, RE_TRIE_MAXBUF_INIT);
2722 if ( SvIV(re_trie_maxbuff)>=0 ) {
2724 regnode *first = (regnode *)NULL;
2725 regnode *last = (regnode *)NULL;
2726 regnode *tail = scan;
2731 SV * const mysv = sv_newmortal(); /* for dumping */
2733 /* var tail is used because there may be a TAIL
2734 regop in the way. Ie, the exacts will point to the
2735 thing following the TAIL, but the last branch will
2736 point at the TAIL. So we advance tail. If we
2737 have nested (?:) we may have to move through several
2741 while ( OP( tail ) == TAIL ) {
2742 /* this is the TAIL generated by (?:) */
2743 tail = regnext( tail );
2748 regprop(RExC_rx, mysv, tail );
2749 PerlIO_printf( Perl_debug_log, "%*s%s%s\n",
2750 (int)depth * 2 + 2, "",
2751 "Looking for TRIE'able sequences. Tail node is: ",
2752 SvPV_nolen_const( mysv )
2758 step through the branches, cur represents each
2759 branch, noper is the first thing to be matched
2760 as part of that branch and noper_next is the
2761 regnext() of that node. if noper is an EXACT
2762 and noper_next is the same as scan (our current
2763 position in the regex) then the EXACT branch is
2764 a possible optimization target. Once we have
2765 two or more consequetive such branches we can
2766 create a trie of the EXACT's contents and stich
2767 it in place. If the sequence represents all of
2768 the branches we eliminate the whole thing and
2769 replace it with a single TRIE. If it is a
2770 subsequence then we need to stitch it in. This
2771 means the first branch has to remain, and needs
2772 to be repointed at the item on the branch chain
2773 following the last branch optimized. This could
2774 be either a BRANCH, in which case the
2775 subsequence is internal, or it could be the
2776 item following the branch sequence in which
2777 case the subsequence is at the end.
2781 /* dont use tail as the end marker for this traverse */
2782 for ( cur = startbranch ; cur != scan ; cur = regnext( cur ) ) {
2783 regnode * const noper = NEXTOPER( cur );
2784 #if defined(DEBUGGING) || defined(NOJUMPTRIE)
2785 regnode * const noper_next = regnext( noper );
2789 regprop(RExC_rx, mysv, cur);
2790 PerlIO_printf( Perl_debug_log, "%*s- %s (%d)",
2791 (int)depth * 2 + 2,"", SvPV_nolen_const( mysv ), REG_NODE_NUM(cur) );
2793 regprop(RExC_rx, mysv, noper);
2794 PerlIO_printf( Perl_debug_log, " -> %s",
2795 SvPV_nolen_const(mysv));
2798 regprop(RExC_rx, mysv, noper_next );
2799 PerlIO_printf( Perl_debug_log,"\t=> %s\t",
2800 SvPV_nolen_const(mysv));
2802 PerlIO_printf( Perl_debug_log, "(First==%d,Last==%d,Cur==%d)\n",
2803 REG_NODE_NUM(first), REG_NODE_NUM(last), REG_NODE_NUM(cur) );
2805 if ( (((first && optype!=NOTHING) ? OP( noper ) == optype
2806 : PL_regkind[ OP( noper ) ] == EXACT )
2807 || OP(noper) == NOTHING )
2809 && noper_next == tail
2814 if ( !first || optype == NOTHING ) {
2815 if (!first) first = cur;
2816 optype = OP( noper );
2822 Currently we assume that the trie can handle unicode and ascii
2823 matches fold cased matches. If this proves true then the following
2824 define will prevent tries in this situation.
2826 #define TRIE_TYPE_IS_SAFE (UTF || optype==EXACT)
2828 #define TRIE_TYPE_IS_SAFE 1
2829 if ( last && TRIE_TYPE_IS_SAFE ) {
2830 make_trie( pRExC_state,
2831 startbranch, first, cur, tail, count,
2834 if ( PL_regkind[ OP( noper ) ] == EXACT
2836 && noper_next == tail
2841 optype = OP( noper );
2851 regprop(RExC_rx, mysv, cur);
2852 PerlIO_printf( Perl_debug_log,
2853 "%*s- %s (%d) <SCAN FINISHED>\n", (int)depth * 2 + 2,
2854 "", SvPV_nolen_const( mysv ),REG_NODE_NUM(cur));
2858 if ( last && TRIE_TYPE_IS_SAFE ) {
2859 made= make_trie( pRExC_state, startbranch, first, scan, tail, count, optype, depth+1 );
2860 #ifdef TRIE_STUDY_OPT
2861 if ( ((made == MADE_EXACT_TRIE &&
2862 startbranch == first)
2863 || ( first_non_open == first )) &&
2865 flags |= SCF_TRIE_RESTUDY;
2866 if ( startbranch == first
2869 RExC_seen &=~REG_TOP_LEVEL_BRANCHES;
2879 else if ( code == BRANCHJ ) { /* single branch is optimized. */
2880 scan = NEXTOPER(NEXTOPER(scan));
2881 } else /* single branch is optimized. */
2882 scan = NEXTOPER(scan);
2884 } else if (OP(scan) == SUSPEND || OP(scan) == GOSUB || OP(scan) == GOSTART) {
2885 scan_frame *newframe = NULL;
2890 if (OP(scan) != SUSPEND) {
2891 /* set the pointer */
2892 if (OP(scan) == GOSUB) {
2894 RExC_recurse[ARG2L(scan)] = scan;
2895 start = RExC_open_parens[paren-1];
2896 end = RExC_close_parens[paren-1];
2899 start = RExC_rxi->program + 1;
2903 Newxz(recursed, (((RExC_npar)>>3) +1), U8);
2904 SAVEFREEPV(recursed);
2906 if (!PAREN_TEST(recursed,paren+1)) {
2907 PAREN_SET(recursed,paren+1);
2908 Newx(newframe,1,scan_frame);
2910 if (flags & SCF_DO_SUBSTR) {
2911 SCAN_COMMIT(pRExC_state,data,minlenp);
2912 data->longest = &(data->longest_float);
2914 is_inf = is_inf_internal = 1;
2915 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
2916 cl_anything(pRExC_state, data->start_class);
2917 flags &= ~SCF_DO_STCLASS;
2920 Newx(newframe,1,scan_frame);
2923 end = regnext(scan);
2928 SAVEFREEPV(newframe);
2929 newframe->next = regnext(scan);
2930 newframe->last = last;
2931 newframe->stop = stopparen;
2932 newframe->prev = frame;
2942 else if (OP(scan) == EXACT) {
2943 I32 l = STR_LEN(scan);
2946 const U8 * const s = (U8*)STRING(scan);
2947 l = utf8_length(s, s + l);
2948 uc = utf8_to_uvchr(s, NULL);
2950 uc = *((U8*)STRING(scan));
2953 if (flags & SCF_DO_SUBSTR) { /* Update longest substr. */
2954 /* The code below prefers earlier match for fixed
2955 offset, later match for variable offset. */
2956 if (data->last_end == -1) { /* Update the start info. */
2957 data->last_start_min = data->pos_min;
2958 data->last_start_max = is_inf
2959 ? I32_MAX : data->pos_min + data->pos_delta;
2961 sv_catpvn(data->last_found, STRING(scan), STR_LEN(scan));
2963 SvUTF8_on(data->last_found);
2965 SV * const sv = data->last_found;
2966 MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
2967 mg_find(sv, PERL_MAGIC_utf8) : NULL;
2968 if (mg && mg->mg_len >= 0)
2969 mg->mg_len += utf8_length((U8*)STRING(scan),
2970 (U8*)STRING(scan)+STR_LEN(scan));
2972 data->last_end = data->pos_min + l;
2973 data->pos_min += l; /* As in the first entry. */
2974 data->flags &= ~SF_BEFORE_EOL;
2976 if (flags & SCF_DO_STCLASS_AND) {
2977 /* Check whether it is compatible with what we know already! */
2981 (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
2982 && !ANYOF_BITMAP_TEST(data->start_class, uc)
2983 && (!(data->start_class->flags & ANYOF_FOLD)
2984 || !ANYOF_BITMAP_TEST(data->start_class, PL_fold[uc])))
2987 ANYOF_CLASS_ZERO(data->start_class);
2988 ANYOF_BITMAP_ZERO(data->start_class);
2990 ANYOF_BITMAP_SET(data->start_class, uc);
2991 data->start_class->flags &= ~ANYOF_EOS;
2993 data->start_class->flags &= ~ANYOF_UNICODE_ALL;
2995 else if (flags & SCF_DO_STCLASS_OR) {
2996 /* false positive possible if the class is case-folded */
2998 ANYOF_BITMAP_SET(data->start_class, uc);
3000 data->start_class->flags |= ANYOF_UNICODE_ALL;
3001 data->start_class->flags &= ~ANYOF_EOS;
3002 cl_and(data->start_class, and_withp);
3004 flags &= ~SCF_DO_STCLASS;
3006 else if (PL_regkind[OP(scan)] == EXACT) { /* But OP != EXACT! */
3007 I32 l = STR_LEN(scan);
3008 UV uc = *((U8*)STRING(scan));
3010 /* Search for fixed substrings supports EXACT only. */
3011 if (flags & SCF_DO_SUBSTR) {
3013 SCAN_COMMIT(pRExC_state, data, minlenp);
3016 const U8 * const s = (U8 *)STRING(scan);
3017 l = utf8_length(s, s + l);
3018 uc = utf8_to_uvchr(s, NULL);
3021 if (flags & SCF_DO_SUBSTR)
3023 if (flags & SCF_DO_STCLASS_AND) {
3024 /* Check whether it is compatible with what we know already! */
3028 (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
3029 && !ANYOF_BITMAP_TEST(data->start_class, uc)
3030 && !ANYOF_BITMAP_TEST(data->start_class, PL_fold[uc])))
3032 ANYOF_CLASS_ZERO(data->start_class);
3033 ANYOF_BITMAP_ZERO(data->start_class);
3035 ANYOF_BITMAP_SET(data->start_class, uc);
3036 data->start_class->flags &= ~ANYOF_EOS;
3037 data->start_class->flags |= ANYOF_FOLD;
3038 if (OP(scan) == EXACTFL)
3039 data->start_class->flags |= ANYOF_LOCALE;
3042 else if (flags & SCF_DO_STCLASS_OR) {
3043 if (data->start_class->flags & ANYOF_FOLD) {
3044 /* false positive possible if the class is case-folded.
3045 Assume that the locale settings are the same... */
3047 ANYOF_BITMAP_SET(data->start_class, uc);
3048 data->start_class->flags &= ~ANYOF_EOS;
3050 cl_and(data->start_class, and_withp);
3052 flags &= ~SCF_DO_STCLASS;
3054 else if (strchr((const char*)PL_varies,OP(scan))) {
3055 I32 mincount, maxcount, minnext, deltanext, fl = 0;
3056 I32 f = flags, pos_before = 0;
3057 regnode * const oscan = scan;
3058 struct regnode_charclass_class this_class;
3059 struct regnode_charclass_class *oclass = NULL;
3060 I32 next_is_eval = 0;
3062 switch (PL_regkind[OP(scan)]) {
3063 case WHILEM: /* End of (?:...)* . */
3064 scan = NEXTOPER(scan);
3067 if (flags & (SCF_DO_SUBSTR | SCF_DO_STCLASS)) {
3068 next = NEXTOPER(scan);
3069 if (OP(next) == EXACT || (flags & SCF_DO_STCLASS)) {
3071 maxcount = REG_INFTY;
3072 next = regnext(scan);
3073 scan = NEXTOPER(scan);
3077 if (flags & SCF_DO_SUBSTR)
3082 if (flags & SCF_DO_STCLASS) {
3084 maxcount = REG_INFTY;
3085 next = regnext(scan);
3086 scan = NEXTOPER(scan);
3089 is_inf = is_inf_internal = 1;
3090 scan = regnext(scan);
3091 if (flags & SCF_DO_SUBSTR) {
3092 SCAN_COMMIT(pRExC_state, data, minlenp); /* Cannot extend fixed substrings */
3093 data->longest = &(data->longest_float);
3095 goto optimize_curly_tail;
3097 if (stopparen>0 && (OP(scan)==CURLYN || OP(scan)==CURLYM)
3098 && (scan->flags == stopparen))
3103 mincount = ARG1(scan);
3104 maxcount = ARG2(scan);
3106 next = regnext(scan);
3107 if (OP(scan) == CURLYX) {
3108 I32 lp = (data ? *(data->last_closep) : 0);
3109 scan->flags = ((lp <= (I32)U8_MAX) ? (U8)lp : U8_MAX);
3111 scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS;
3112 next_is_eval = (OP(scan) == EVAL);
3114 if (flags & SCF_DO_SUBSTR) {
3115 if (mincount == 0) SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot extend fixed substrings */
3116 pos_before = data->pos_min;
3120 data->flags &= ~(SF_HAS_PAR|SF_IN_PAR|SF_HAS_EVAL);
3122 data->flags |= SF_IS_INF;
3124 if (flags & SCF_DO_STCLASS) {
3125 cl_init(pRExC_state, &this_class);
3126 oclass = data->start_class;
3127 data->start_class = &this_class;
3128 f |= SCF_DO_STCLASS_AND;
3129 f &= ~SCF_DO_STCLASS_OR;
3131 /* These are the cases when once a subexpression
3132 fails at a particular position, it cannot succeed
3133 even after backtracking at the enclosing scope.
3135 XXXX what if minimal match and we are at the
3136 initial run of {n,m}? */
3137 if ((mincount != maxcount - 1) && (maxcount != REG_INFTY))
3138 f &= ~SCF_WHILEM_VISITED_POS;
3140 /* This will finish on WHILEM, setting scan, or on NULL: */
3141 minnext = study_chunk(pRExC_state, &scan, minlenp, &deltanext,
3142 last, data, stopparen, recursed, NULL,
3144 ? (f & ~SCF_DO_SUBSTR) : f),depth+1);
3146 if (flags & SCF_DO_STCLASS)
3147 data->start_class = oclass;
3148 if (mincount == 0 || minnext == 0) {
3149 if (flags & SCF_DO_STCLASS_OR) {
3150 cl_or(pRExC_state, data->start_class, &this_class);
3152 else if (flags & SCF_DO_STCLASS_AND) {
3153 /* Switch to OR mode: cache the old value of
3154 * data->start_class */
3156 StructCopy(data->start_class, and_withp,
3157 struct regnode_charclass_class);
3158 flags &= ~SCF_DO_STCLASS_AND;
3159 StructCopy(&this_class, data->start_class,
3160 struct regnode_charclass_class);
3161 flags |= SCF_DO_STCLASS_OR;
3162 data->start_class->flags |= ANYOF_EOS;
3164 } else { /* Non-zero len */
3165 if (flags & SCF_DO_STCLASS_OR) {
3166 cl_or(pRExC_state, data->start_class, &this_class);
3167 cl_and(data->start_class, and_withp);
3169 else if (flags & SCF_DO_STCLASS_AND)
3170 cl_and(data->start_class, &this_class);
3171 flags &= ~SCF_DO_STCLASS;
3173 if (!scan) /* It was not CURLYX, but CURLY. */
3175 if ( /* ? quantifier ok, except for (?{ ... }) */
3176 (next_is_eval || !(mincount == 0 && maxcount == 1))
3177 && (minnext == 0) && (deltanext == 0)
3178 && data && !(data->flags & (SF_HAS_PAR|SF_IN_PAR))
3179 && maxcount <= REG_INFTY/3 /* Complement check for big count */
3180 && ckWARN(WARN_REGEXP))
3183 "Quantifier unexpected on zero-length expression");
3186 min += minnext * mincount;
3187 is_inf_internal |= ((maxcount == REG_INFTY
3188 && (minnext + deltanext) > 0)
3189 || deltanext == I32_MAX);
3190 is_inf |= is_inf_internal;
3191 delta += (minnext + deltanext) * maxcount - minnext * mincount;
3193 /* Try powerful optimization CURLYX => CURLYN. */
3194 if ( OP(oscan) == CURLYX && data
3195 && data->flags & SF_IN_PAR
3196 && !(data->flags & SF_HAS_EVAL)
3197 && !deltanext && minnext == 1 ) {
3198 /* Try to optimize to CURLYN. */
3199 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS;
3200 regnode * const nxt1 = nxt;
3207 if (!strchr((const char*)PL_simple,OP(nxt))
3208 && !(PL_regkind[OP(nxt)] == EXACT
3209 && STR_LEN(nxt) == 1))
3215 if (OP(nxt) != CLOSE)
3217 if (RExC_open_parens) {
3218 RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
3219 RExC_close_parens[ARG(nxt1)-1]=nxt+2; /*close->while*/
3221 /* Now we know that nxt2 is the only contents: */
3222 oscan->flags = (U8)ARG(nxt);
3224 OP(nxt1) = NOTHING; /* was OPEN. */
3227 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
3228 NEXT_OFF(nxt1+ 1) = 0; /* just for consistancy. */
3229 NEXT_OFF(nxt2) = 0; /* just for consistancy with CURLY. */
3230 OP(nxt) = OPTIMIZED; /* was CLOSE. */
3231 OP(nxt + 1) = OPTIMIZED; /* was count. */
3232 NEXT_OFF(nxt+ 1) = 0; /* just for consistancy. */
3237 /* Try optimization CURLYX => CURLYM. */
3238 if ( OP(oscan) == CURLYX && data
3239 && !(data->flags & SF_HAS_PAR)
3240 && !(data->flags & SF_HAS_EVAL)
3241 && !deltanext /* atom is fixed width */
3242 && minnext != 0 /* CURLYM can't handle zero width */
3244 /* XXXX How to optimize if data == 0? */
3245 /* Optimize to a simpler form. */
3246 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN */
3250 while ( (nxt2 = regnext(nxt)) /* skip over embedded stuff*/
3251 && (OP(nxt2) != WHILEM))
3253 OP(nxt2) = SUCCEED; /* Whas WHILEM */
3254 /* Need to optimize away parenths. */
3255 if (data->flags & SF_IN_PAR) {
3256 /* Set the parenth number. */
3257 regnode *nxt1 = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN*/
3259 if (OP(nxt) != CLOSE)
3260 FAIL("Panic opt close");
3261 oscan->flags = (U8)ARG(nxt);
3262 if (RExC_open_parens) {
3263 RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
3264 RExC_close_parens[ARG(nxt1)-1]=nxt2+1; /*close->NOTHING*/
3266 OP(nxt1) = OPTIMIZED; /* was OPEN. */
3267 OP(nxt) = OPTIMIZED; /* was CLOSE. */
3270 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
3271 OP(nxt + 1) = OPTIMIZED; /* was count. */
3272 NEXT_OFF(nxt1 + 1) = 0; /* just for consistancy. */
3273 NEXT_OFF(nxt + 1) = 0; /* just for consistancy. */
3276 while ( nxt1 && (OP(nxt1) != WHILEM)) {
3277 regnode *nnxt = regnext(nxt1);
3280 if (reg_off_by_arg[OP(nxt1)])
3281 ARG_SET(nxt1, nxt2 - nxt1);
3282 else if (nxt2 - nxt1 < U16_MAX)
3283 NEXT_OFF(nxt1) = nxt2 - nxt1;
3285 OP(nxt) = NOTHING; /* Cannot beautify */
3290 /* Optimize again: */
3291 study_chunk(pRExC_state, &nxt1, minlenp, &deltanext, nxt,
3292 NULL, stopparen, recursed, NULL, 0,depth+1);
3297 else if ((OP(oscan) == CURLYX)
3298 && (flags & SCF_WHILEM_VISITED_POS)
3299 /* See the comment on a similar expression above.
3300 However, this time it not a subexpression
3301 we care about, but the expression itself. */
3302 && (maxcount == REG_INFTY)
3303 && data && ++data->whilem_c < 16) {
3304 /* This stays as CURLYX, we can put the count/of pair. */
3305 /* Find WHILEM (as in regexec.c) */
3306 regnode *nxt = oscan + NEXT_OFF(oscan);
3308 if (OP(PREVOPER(nxt)) == NOTHING) /* LONGJMP */
3310 PREVOPER(nxt)->flags = (U8)(data->whilem_c
3311 | (RExC_whilem_seen << 4)); /* On WHILEM */
3313 if (data && fl & (SF_HAS_PAR|SF_IN_PAR))
3315 if (flags & SCF_DO_SUBSTR) {
3316 SV *last_str = NULL;
3317 int counted = mincount != 0;
3319 if (data->last_end > 0 && mincount != 0) { /* Ends with a string. */
3320 #if defined(SPARC64_GCC_WORKAROUND)
3323 const char *s = NULL;
3326 if (pos_before >= data->last_start_min)
3329 b = data->last_start_min;
3332 s = SvPV_const(data->last_found, l);
3333 old = b - data->last_start_min;
3336 I32 b = pos_before >= data->last_start_min
3337 ? pos_before : data->last_start_min;
3339 const char * const s = SvPV_const(data->last_found, l);
3340 I32 old = b - data->last_start_min;
3344 old = utf8_hop((U8*)s, old) - (U8*)s;
3347 /* Get the added string: */
3348 last_str = newSVpvn_utf8(s + old, l, UTF);
3349 if (deltanext == 0 && pos_before == b) {
3350 /* What was added is a constant string */
3352 SvGROW(last_str, (mincount * l) + 1);
3353 repeatcpy(SvPVX(last_str) + l,
3354 SvPVX_const(last_str), l, mincount - 1);
3355 SvCUR_set(last_str, SvCUR(last_str) * mincount);
3356 /* Add additional parts. */
3357 SvCUR_set(data->last_found,
3358 SvCUR(data->last_found) - l);
3359 sv_catsv(data->last_found, last_str);
3361 SV * sv = data->last_found;
3363 SvUTF8(sv) && SvMAGICAL(sv) ?
3364 mg_find(sv, PERL_MAGIC_utf8) : NULL;
3365 if (mg && mg->mg_len >= 0)
3366 mg->mg_len += CHR_SVLEN(last_str) - l;
3368 data->last_end += l * (mincount - 1);
3371 /* start offset must point into the last copy */
3372 data->last_start_min += minnext * (mincount - 1);
3373 data->last_start_max += is_inf ? I32_MAX
3374 : (maxcount - 1) * (minnext + data->pos_delta);
3377 /* It is counted once already... */
3378 data->pos_min += minnext * (mincount - counted);
3379 data->pos_delta += - counted * deltanext +
3380 (minnext + deltanext) * maxcount - minnext * mincount;
3381 if (mincount != maxcount) {
3382 /* Cannot extend fixed substrings found inside
3384 SCAN_COMMIT(pRExC_state,data,minlenp);
3385 if (mincount && last_str) {
3386 SV * const sv = data->last_found;
3387 MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
3388 mg_find(sv, PERL_MAGIC_utf8) : NULL;
3392 sv_setsv(sv, last_str);
3393 data->last_end = data->pos_min;
3394 data->last_start_min =
3395 data->pos_min - CHR_SVLEN(last_str);
3396 data->last_start_max = is_inf
3398 : data->pos_min + data->pos_delta
3399 - CHR_SVLEN(last_str);
3401 data->longest = &(data->longest_float);
3403 SvREFCNT_dec(last_str);
3405 if (data && (fl & SF_HAS_EVAL))
3406 data->flags |= SF_HAS_EVAL;
3407 optimize_curly_tail:
3408 if (OP(oscan) != CURLYX) {
3409 while (PL_regkind[OP(next = regnext(oscan))] == NOTHING
3411 NEXT_OFF(oscan) += NEXT_OFF(next);
3414 default: /* REF and CLUMP only? */
3415 if (flags & SCF_DO_SUBSTR) {
3416 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3417 data->longest = &(data->longest_float);
3419 is_inf = is_inf_internal = 1;
3420 if (flags & SCF_DO_STCLASS_OR)
3421 cl_anything(pRExC_state, data->start_class);
3422 flags &= ~SCF_DO_STCLASS;
3426 else if (OP(scan) == LNBREAK) {
3427 if (flags & SCF_DO_STCLASS) {
3429 data->start_class->flags &= ~ANYOF_EOS; /* No match on empty */
3430 if (flags & SCF_DO_STCLASS_AND) {
3431 for (value = 0; value < 256; value++)
3432 if (!is_VERTWS_cp(value))
3433 ANYOF_BITMAP_CLEAR(data->start_class, value);
3436 for (value = 0; value < 256; value++)
3437 if (is_VERTWS_cp(value))
3438 ANYOF_BITMAP_SET(data->start_class, value);
3440 if (flags & SCF_DO_STCLASS_OR)
3441 cl_and(data->start_class, and_withp);
3442 flags &= ~SCF_DO_STCLASS;
3446 if (flags & SCF_DO_SUBSTR) {
3447 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3449 data->pos_delta += 1;
3450 data->longest = &(data->longest_float);
3454 else if (OP(scan) == FOLDCHAR) {
3455 int d = ARG(scan)==0xDF ? 1 : 2;
3456 flags &= ~SCF_DO_STCLASS;
3459 if (flags & SCF_DO_SUBSTR) {
3460 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3462 data->pos_delta += d;
3463 data->longest = &(data->longest_float);
3466 else if (strchr((const char*)PL_simple,OP(scan))) {
3469 if (flags & SCF_DO_SUBSTR) {
3470 SCAN_COMMIT(pRExC_state,data,minlenp);
3474 if (flags & SCF_DO_STCLASS) {
3475 data->start_class->flags &= ~ANYOF_EOS; /* No match on empty */
3477 /* Some of the logic below assumes that switching
3478 locale on will only add false positives. */
3479 switch (PL_regkind[OP(scan)]) {
3483 /* Perl_croak(aTHX_ "panic: unexpected simple REx opcode %d", OP(scan)); */
3484 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
3485 cl_anything(pRExC_state, data->start_class);
3488 if (OP(scan) == SANY)
3490 if (flags & SCF_DO_STCLASS_OR) { /* Everything but \n */
3491 value = (ANYOF_BITMAP_TEST(data->start_class,'\n')
3492 || (data->start_class->flags & ANYOF_CLASS));
3493 cl_anything(pRExC_state, data->start_class);
3495 if (flags & SCF_DO_STCLASS_AND || !value)
3496 ANYOF_BITMAP_CLEAR(data->start_class,'\n');
3499 if (flags & SCF_DO_STCLASS_AND)
3500 cl_and(data->start_class,
3501 (struct regnode_charclass_class*)scan);
3503 cl_or(pRExC_state, data->start_class,
3504 (struct regnode_charclass_class*)scan);
3507 if (flags & SCF_DO_STCLASS_AND) {
3508 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3509 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NALNUM);
3510 for (value = 0; value < 256; value++)
3511 if (!isALNUM(value))
3512 ANYOF_BITMAP_CLEAR(data->start_class, value);
3516 if (data->start_class->flags & ANYOF_LOCALE)
3517 ANYOF_CLASS_SET(data->start_class,ANYOF_ALNUM);
3519 for (value = 0; value < 256; value++)
3521 ANYOF_BITMAP_SET(data->start_class, value);
3526 if (flags & SCF_DO_STCLASS_AND) {
3527 if (data->start_class->flags & ANYOF_LOCALE)
3528 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NALNUM);
3531 ANYOF_CLASS_SET(data->start_class,ANYOF_ALNUM);
3532 data->start_class->flags |= ANYOF_LOCALE;
3536 if (flags & SCF_DO_STCLASS_AND) {
3537 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3538 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_ALNUM);
3539 for (value = 0; value < 256; value++)
3541 ANYOF_BITMAP_CLEAR(data->start_class, value);
3545 if (data->start_class->flags & ANYOF_LOCALE)
3546 ANYOF_CLASS_SET(data->start_class,ANYOF_NALNUM);
3548 for (value = 0; value < 256; value++)
3549 if (!isALNUM(value))
3550 ANYOF_BITMAP_SET(data->start_class, value);
3555 if (flags & SCF_DO_STCLASS_AND) {
3556 if (data->start_class->flags & ANYOF_LOCALE)
3557 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_ALNUM);
3560 data->start_class->flags |= ANYOF_LOCALE;
3561 ANYOF_CLASS_SET(data->start_class,ANYOF_NALNUM);
3565 if (flags & SCF_DO_STCLASS_AND) {
3566 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3567 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NSPACE);
3568 for (value = 0; value < 256; value++)
3569 if (!isSPACE(value))
3570 ANYOF_BITMAP_CLEAR(data->start_class, value);
3574 if (data->start_class->flags & ANYOF_LOCALE)
3575 ANYOF_CLASS_SET(data->start_class,ANYOF_SPACE);
3577 for (value = 0; value < 256; value++)
3579 ANYOF_BITMAP_SET(data->start_class, value);
3584 if (flags & SCF_DO_STCLASS_AND) {
3585 if (data->start_class->flags & ANYOF_LOCALE)
3586 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NSPACE);
3589 data->start_class->flags |= ANYOF_LOCALE;
3590 ANYOF_CLASS_SET(data->start_class,ANYOF_SPACE);
3594 if (flags & SCF_DO_STCLASS_AND) {
3595 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3596 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_SPACE);
3597 for (value = 0; value < 256; value++)
3599 ANYOF_BITMAP_CLEAR(data->start_class, value);
3603 if (data->start_class->flags & ANYOF_LOCALE)
3604 ANYOF_CLASS_SET(data->start_class,ANYOF_NSPACE);
3606 for (value = 0; value < 256; value++)
3607 if (!isSPACE(value))
3608 ANYOF_BITMAP_SET(data->start_class, value);
3613 if (flags & SCF_DO_STCLASS_AND) {
3614 if (data->start_class->flags & ANYOF_LOCALE) {
3615 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_SPACE);
3616 for (value = 0; value < 256; value++)
3617 if (!isSPACE(value))
3618 ANYOF_BITMAP_CLEAR(data->start_class, value);
3622 data->start_class->flags |= ANYOF_LOCALE;
3623 ANYOF_CLASS_SET(data->start_class,ANYOF_NSPACE);
3627 if (flags & SCF_DO_STCLASS_AND) {
3628 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NDIGIT);
3629 for (value = 0; value < 256; value++)
3630 if (!isDIGIT(value))
3631 ANYOF_BITMAP_CLEAR(data->start_class, value);
3634 if (data->start_class->flags & ANYOF_LOCALE)
3635 ANYOF_CLASS_SET(data->start_class,ANYOF_DIGIT);
3637 for (value = 0; value < 256; value++)
3639 ANYOF_BITMAP_SET(data->start_class, value);
3644 if (flags & SCF_DO_STCLASS_AND) {
3645 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_DIGIT);
3646 for (value = 0; value < 256; value++)
3648 ANYOF_BITMAP_CLEAR(data->start_class, value);
3651 if (data->start_class->flags & ANYOF_LOCALE)
3652 ANYOF_CLASS_SET(data->start_class,ANYOF_NDIGIT);
3654 for (value = 0; value < 256; value++)
3655 if (!isDIGIT(value))
3656 ANYOF_BITMAP_SET(data->start_class, value);
3660 CASE_SYNST_FNC(VERTWS);
3661 CASE_SYNST_FNC(HORIZWS);
3664 if (flags & SCF_DO_STCLASS_OR)
3665 cl_and(data->start_class, and_withp);
3666 flags &= ~SCF_DO_STCLASS;
3669 else if (PL_regkind[OP(scan)] == EOL && flags & SCF_DO_SUBSTR) {
3670 data->flags |= (OP(scan) == MEOL
3674 else if ( PL_regkind[OP(scan)] == BRANCHJ
3675 /* Lookbehind, or need to calculate parens/evals/stclass: */
3676 && (scan->flags || data || (flags & SCF_DO_STCLASS))
3677 && (OP(scan) == IFMATCH || OP(scan) == UNLESSM)) {
3678 if ( !PERL_ENABLE_POSITIVE_ASSERTION_STUDY
3679 || OP(scan) == UNLESSM )
3681 /* Negative Lookahead/lookbehind
3682 In this case we can't do fixed string optimisation.
3685 I32 deltanext, minnext, fake = 0;
3687 struct regnode_charclass_class intrnl;
3690 data_fake.flags = 0;
3692 data_fake.whilem_c = data->whilem_c;
3693 data_fake.last_closep = data->last_closep;
3696 data_fake.last_closep = &fake;
3697 data_fake.pos_delta = delta;
3698 if ( flags & SCF_DO_STCLASS && !scan->flags
3699 && OP(scan) == IFMATCH ) { /* Lookahead */
3700 cl_init(pRExC_state, &intrnl);
3701 data_fake.start_class = &intrnl;
3702 f |= SCF_DO_STCLASS_AND;
3704 if (flags & SCF_WHILEM_VISITED_POS)
3705 f |= SCF_WHILEM_VISITED_POS;
3706 next = regnext(scan);
3707 nscan = NEXTOPER(NEXTOPER(scan));
3708 minnext = study_chunk(pRExC_state, &nscan, minlenp, &deltanext,
3709 last, &data_fake, stopparen, recursed, NULL, f, depth+1);
3712 FAIL("Variable length lookbehind not implemented");
3714 else if (minnext > (I32)U8_MAX) {
3715 FAIL2("Lookbehind longer than %"UVuf" not implemented", (UV)U8_MAX);
3717 scan->flags = (U8)minnext;
3720 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3722 if (data_fake.flags & SF_HAS_EVAL)
3723 data->flags |= SF_HAS_EVAL;
3724 data->whilem_c = data_fake.whilem_c;
3726 if (f & SCF_DO_STCLASS_AND) {
3727 const int was = (data->start_class->flags & ANYOF_EOS);
3729 cl_and(data->start_class, &intrnl);
3731 data->start_class->flags |= ANYOF_EOS;
3734 #if PERL_ENABLE_POSITIVE_ASSERTION_STUDY
3736 /* Positive Lookahead/lookbehind
3737 In this case we can do fixed string optimisation,
3738 but we must be careful about it. Note in the case of
3739 lookbehind the positions will be offset by the minimum
3740 length of the pattern, something we won't know about
3741 until after the recurse.
3743 I32 deltanext, fake = 0;
3745 struct regnode_charclass_class intrnl;
3747 /* We use SAVEFREEPV so that when the full compile
3748 is finished perl will clean up the allocated
3749 minlens when its all done. This was we don't
3750 have to worry about freeing them when we know
3751 they wont be used, which would be a pain.
3754 Newx( minnextp, 1, I32 );
3755 SAVEFREEPV(minnextp);
3758 StructCopy(data, &data_fake, scan_data_t);
3759 if ((flags & SCF_DO_SUBSTR) && data->last_found) {
3762 SCAN_COMMIT(pRExC_state, &data_fake,minlenp);
3763 data_fake.last_found=newSVsv(data->last_found);
3767 data_fake.last_closep = &fake;
3768 data_fake.flags = 0;
3769 data_fake.pos_delta = delta;
3771 data_fake.flags |= SF_IS_INF;
3772 if ( flags & SCF_DO_STCLASS && !scan->flags
3773 && OP(scan) == IFMATCH ) { /* Lookahead */
3774 cl_init(pRExC_state, &intrnl);
3775 data_fake.start_class = &intrnl;
3776 f |= SCF_DO_STCLASS_AND;
3778 if (flags & SCF_WHILEM_VISITED_POS)
3779 f |= SCF_WHILEM_VISITED_POS;
3780 next = regnext(scan);
3781 nscan = NEXTOPER(NEXTOPER(scan));
3783 *minnextp = study_chunk(pRExC_state, &nscan, minnextp, &deltanext,
3784 last, &data_fake, stopparen, recursed, NULL, f,depth+1);
3787 FAIL("Variable length lookbehind not implemented");
3789 else if (*minnextp > (I32)U8_MAX) {
3790 FAIL2("Lookbehind longer than %"UVuf" not implemented", (UV)U8_MAX);
3792 scan->flags = (U8)*minnextp;
3797 if (f & SCF_DO_STCLASS_AND) {
3798 const int was = (data->start_class->flags & ANYOF_EOS);
3800 cl_and(data->start_class, &intrnl);
3802 data->start_class->flags |= ANYOF_EOS;
3805 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3807 if (data_fake.flags & SF_HAS_EVAL)
3808 data->flags |= SF_HAS_EVAL;
3809 data->whilem_c = data_fake.whilem_c;
3810 if ((flags & SCF_DO_SUBSTR) && data_fake.last_found) {
3811 if (RExC_rx->minlen<*minnextp)
3812 RExC_rx->minlen=*minnextp;
3813 SCAN_COMMIT(pRExC_state, &data_fake, minnextp);
3814 SvREFCNT_dec(data_fake.last_found);
3816 if ( data_fake.minlen_fixed != minlenp )
3818 data->offset_fixed= data_fake.offset_fixed;
3819 data->minlen_fixed= data_fake.minlen_fixed;
3820 data->lookbehind_fixed+= scan->flags;
3822 if ( data_fake.minlen_float != minlenp )
3824 data->minlen_float= data_fake.minlen_float;
3825 data->offset_float_min=data_fake.offset_float_min;
3826 data->offset_float_max=data_fake.offset_float_max;
3827 data->lookbehind_float+= scan->flags;
3836 else if (OP(scan) == OPEN) {
3837 if (stopparen != (I32)ARG(scan))
3840 else if (OP(scan) == CLOSE) {
3841 if (stopparen == (I32)ARG(scan)) {
3844 if ((I32)ARG(scan) == is_par) {
3845 next = regnext(scan);
3847 if ( next && (OP(next) != WHILEM) && next < last)
3848 is_par = 0; /* Disable optimization */
3851 *(data->last_closep) = ARG(scan);
3853 else if (OP(scan) == EVAL) {
3855 data->flags |= SF_HAS_EVAL;
3857 else if ( PL_regkind[OP(scan)] == ENDLIKE ) {
3858 if (flags & SCF_DO_SUBSTR) {
3859 SCAN_COMMIT(pRExC_state,data,minlenp);
3860 flags &= ~SCF_DO_SUBSTR;
3862 if (data && OP(scan)==ACCEPT) {
3863 data->flags |= SCF_SEEN_ACCEPT;
3868 else if (OP(scan) == LOGICAL && scan->flags == 2) /* Embedded follows */
3870 if (flags & SCF_DO_SUBSTR) {
3871 SCAN_COMMIT(pRExC_state,data,minlenp);
3872 data->longest = &(data->longest_float);
3874 is_inf = is_inf_internal = 1;
3875 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
3876 cl_anything(pRExC_state, data->start_class);
3877 flags &= ~SCF_DO_STCLASS;
3879 else if (OP(scan) == GPOS) {
3880 if (!(RExC_rx->extflags & RXf_GPOS_FLOAT) &&
3881 !(delta || is_inf || (data && data->pos_delta)))
3883 if (!(RExC_rx->extflags & RXf_ANCH) && (flags & SCF_DO_SUBSTR))
3884 RExC_rx->extflags |= RXf_ANCH_GPOS;
3885 if (RExC_rx->gofs < (U32)min)
3886 RExC_rx->gofs = min;
3888 RExC_rx->extflags |= RXf_GPOS_FLOAT;
3892 #ifdef TRIE_STUDY_OPT
3893 #ifdef FULL_TRIE_STUDY
3894 else if (PL_regkind[OP(scan)] == TRIE) {
3895 /* NOTE - There is similar code to this block above for handling
3896 BRANCH nodes on the initial study. If you change stuff here
3898 regnode *trie_node= scan;
3899 regnode *tail= regnext(scan);
3900 reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
3901 I32 max1 = 0, min1 = I32_MAX;
3902 struct regnode_charclass_class accum;
3904 if (flags & SCF_DO_SUBSTR) /* XXXX Add !SUSPEND? */
3905 SCAN_COMMIT(pRExC_state, data,minlenp); /* Cannot merge strings after this. */
3906 if (flags & SCF_DO_STCLASS)
3907 cl_init_zero(pRExC_state, &accum);
3913 const regnode *nextbranch= NULL;
3916 for ( word=1 ; word <= trie->wordcount ; word++)
3918 I32 deltanext=0, minnext=0, f = 0, fake;
3919 struct regnode_charclass_class this_class;
3921 data_fake.flags = 0;
3923 data_fake.whilem_c = data->whilem_c;
3924 data_fake.last_closep = data->last_closep;
3927 data_fake.last_closep = &fake;
3928 data_fake.pos_delta = delta;
3929 if (flags & SCF_DO_STCLASS) {
3930 cl_init(pRExC_state, &this_class);
3931 data_fake.start_class = &this_class;
3932 f = SCF_DO_STCLASS_AND;
3934 if (flags & SCF_WHILEM_VISITED_POS)
3935 f |= SCF_WHILEM_VISITED_POS;
3937 if (trie->jump[word]) {
3939 nextbranch = trie_node + trie->jump[0];
3940 scan= trie_node + trie->jump[word];
3941 /* We go from the jump point to the branch that follows
3942 it. Note this means we need the vestigal unused branches
3943 even though they arent otherwise used.
3945 minnext = study_chunk(pRExC_state, &scan, minlenp,
3946 &deltanext, (regnode *)nextbranch, &data_fake,
3947 stopparen, recursed, NULL, f,depth+1);
3949 if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
3950 nextbranch= regnext((regnode*)nextbranch);
3952 if (min1 > (I32)(minnext + trie->minlen))
3953 min1 = minnext + trie->minlen;
3954 if (max1 < (I32)(minnext + deltanext + trie->maxlen))
3955 max1 = minnext + deltanext + trie->maxlen;
3956 if (deltanext == I32_MAX)
3957 is_inf = is_inf_internal = 1;
3959 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3961 if (data_fake.flags & SCF_SEEN_ACCEPT) {
3962 if ( stopmin > min + min1)
3963 stopmin = min + min1;
3964 flags &= ~SCF_DO_SUBSTR;
3966 data->flags |= SCF_SEEN_ACCEPT;
3969 if (data_fake.flags & SF_HAS_EVAL)
3970 data->flags |= SF_HAS_EVAL;
3971 data->whilem_c = data_fake.whilem_c;
3973 if (flags & SCF_DO_STCLASS)
3974 cl_or(pRExC_state, &accum, &this_class);
3977 if (flags & SCF_DO_SUBSTR) {
3978 data->pos_min += min1;
3979 data->pos_delta += max1 - min1;
3980 if (max1 != min1 || is_inf)
3981 data->longest = &(data->longest_float);
3984 delta += max1 - min1;
3985 if (flags & SCF_DO_STCLASS_OR) {
3986 cl_or(pRExC_state, data->start_class, &accum);
3988 cl_and(data->start_class, and_withp);
3989 flags &= ~SCF_DO_STCLASS;
3992 else if (flags & SCF_DO_STCLASS_AND) {
3994 cl_and(data->start_class, &accum);
3995 flags &= ~SCF_DO_STCLASS;
3998 /* Switch to OR mode: cache the old value of
3999 * data->start_class */
4001 StructCopy(data->start_class, and_withp,
4002 struct regnode_charclass_class);
4003 flags &= ~SCF_DO_STCLASS_AND;
4004 StructCopy(&accum, data->start_class,
4005 struct regnode_charclass_class);
4006 flags |= SCF_DO_STCLASS_OR;
4007 data->start_class->flags |= ANYOF_EOS;
4014 else if (PL_regkind[OP(scan)] == TRIE) {
4015 reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
4018 min += trie->minlen;
4019 delta += (trie->maxlen - trie->minlen);
4020 flags &= ~SCF_DO_STCLASS; /* xxx */
4021 if (flags & SCF_DO_SUBSTR) {
4022 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
4023 data->pos_min += trie->minlen;
4024 data->pos_delta += (trie->maxlen - trie->minlen);
4025 if (trie->maxlen != trie->minlen)
4026 data->longest = &(data->longest_float);
4028 if (trie->jump) /* no more substrings -- for now /grr*/
4029 flags &= ~SCF_DO_SUBSTR;
4031 #endif /* old or new */
4032 #endif /* TRIE_STUDY_OPT */
4034 /* Else: zero-length, ignore. */
4035 scan = regnext(scan);
4040 stopparen = frame->stop;
4041 frame = frame->prev;
4042 goto fake_study_recurse;
4047 DEBUG_STUDYDATA("pre-fin:",data,depth);
4050 *deltap = is_inf_internal ? I32_MAX : delta;
4051 if (flags & SCF_DO_SUBSTR && is_inf)
4052 data->pos_delta = I32_MAX - data->pos_min;
4053 if (is_par > (I32)U8_MAX)
4055 if (is_par && pars==1 && data) {
4056 data->flags |= SF_IN_PAR;
4057 data->flags &= ~SF_HAS_PAR;
4059 else if (pars && data) {
4060 data->flags |= SF_HAS_PAR;
4061 data->flags &= ~SF_IN_PAR;
4063 if (flags & SCF_DO_STCLASS_OR)
4064 cl_and(data->start_class, and_withp);
4065 if (flags & SCF_TRIE_RESTUDY)
4066 data->flags |= SCF_TRIE_RESTUDY;
4068 DEBUG_STUDYDATA("post-fin:",data,depth);
4070 return min < stopmin ? min : stopmin;
4074 S_add_data(RExC_state_t *pRExC_state, U32 n, const char *s)
4076 U32 count = RExC_rxi->data ? RExC_rxi->data->count : 0;
4078 PERL_ARGS_ASSERT_ADD_DATA;
4080 Renewc(RExC_rxi->data,
4081 sizeof(*RExC_rxi->data) + sizeof(void*) * (count + n - 1),
4082 char, struct reg_data);
4084 Renew(RExC_rxi->data->what, count + n, U8);
4086 Newx(RExC_rxi->data->what, n, U8);
4087 RExC_rxi->data->count = count + n;
4088 Copy(s, RExC_rxi->data->what + count, n, U8);
4092 /*XXX: todo make this not included in a non debugging perl */
4093 #ifndef PERL_IN_XSUB_RE
4095 Perl_reginitcolors(pTHX)
4098 const char * const s = PerlEnv_getenv("PERL_RE_COLORS");
4100 char *t = savepv(s);
4104 t = strchr(t, '\t');
4110 PL_colors[i] = t = (char *)"";
4115 PL_colors[i++] = (char *)"";
4122 #ifdef TRIE_STUDY_OPT
4123 #define CHECK_RESTUDY_GOTO \
4125 (data.flags & SCF_TRIE_RESTUDY) \
4129 #define CHECK_RESTUDY_GOTO
4133 - pregcomp - compile a regular expression into internal code
4135 * We can't allocate space until we know how big the compiled form will be,
4136 * but we can't compile it (and thus know how big it is) until we've got a
4137 * place to put the code. So we cheat: we compile it twice, once with code
4138 * generation turned off and size counting turned on, and once "for real".
4139 * This also means that we don't allocate space until we are sure that the
4140 * thing really will compile successfully, and we never have to move the
4141 * code and thus invalidate pointers into it. (Note that it has to be in
4142 * one piece because free() must be able to free it all.) [NB: not true in perl]
4144 * Beware that the optimization-preparation code in here knows about some
4145 * of the structure of the compiled regexp. [I'll say.]
4150 #ifndef PERL_IN_XSUB_RE
4151 #define RE_ENGINE_PTR &PL_core_reg_engine
4153 extern const struct regexp_engine my_reg_engine;
4154 #define RE_ENGINE_PTR &my_reg_engine
4157 #ifndef PERL_IN_XSUB_RE
4159 Perl_pregcomp(pTHX_ const SV * const pattern, const U32 flags)
4162 HV * const table = GvHV(PL_hintgv);
4164 PERL_ARGS_ASSERT_PREGCOMP;
4166 /* Dispatch a request to compile a regexp to correct
4169 SV **ptr= hv_fetchs(table, "regcomp", FALSE);
4170 GET_RE_DEBUG_FLAGS_DECL;
4171 if (ptr && SvIOK(*ptr) && SvIV(*ptr)) {
4172 const regexp_engine *eng=INT2PTR(regexp_engine*,SvIV(*ptr));
4174 PerlIO_printf(Perl_debug_log, "Using engine %"UVxf"\n",
4177 return CALLREGCOMP_ENG(eng, pattern, flags);
4180 return Perl_re_compile(aTHX_ pattern, flags);
4185 Perl_re_compile(pTHX_ const SV * const pattern, U32 pm_flags)
4190 register regexp_internal *ri;
4192 char* exp = SvPV((SV*)pattern, plen);
4193 char* xend = exp + plen;
4200 RExC_state_t RExC_state;
4201 RExC_state_t * const pRExC_state = &RExC_state;
4202 #ifdef TRIE_STUDY_OPT
4204 RExC_state_t copyRExC_state;
4206 GET_RE_DEBUG_FLAGS_DECL;
4208 PERL_ARGS_ASSERT_RE_COMPILE;
4210 DEBUG_r(if (!PL_colorset) reginitcolors());
4212 RExC_utf8 = RExC_orig_utf8 = SvUTF8(pattern);
4215 SV *dsv= sv_newmortal();
4216 RE_PV_QUOTED_DECL(s, RExC_utf8,
4217 dsv, exp, plen, 60);
4218 PerlIO_printf(Perl_debug_log, "%sCompiling REx%s %s\n",
4219 PL_colors[4],PL_colors[5],s);
4224 RExC_flags = pm_flags;
4228 RExC_seen_zerolen = *exp == '^' ? -1 : 0;
4229 RExC_seen_evals = 0;
4232 /* First pass: determine size, legality. */
4240 RExC_emit = &PL_regdummy;
4241 RExC_whilem_seen = 0;
4242 RExC_charnames = NULL;
4243 RExC_open_parens = NULL;
4244 RExC_close_parens = NULL;
4246 RExC_paren_names = NULL;
4248 RExC_paren_name_list = NULL;
4250 RExC_recurse = NULL;
4251 RExC_recurse_count = 0;
4253 #if 0 /* REGC() is (currently) a NOP at the first pass.
4254 * Clever compilers notice this and complain. --jhi */
4255 REGC((U8)REG_MAGIC, (char*)RExC_emit);
4257 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log, "Starting first pass (sizing)\n"));
4258 if (reg(pRExC_state, 0, &flags,1) == NULL) {
4259 RExC_precomp = NULL;
4262 if (RExC_utf8 && !RExC_orig_utf8) {
4263 /* It's possible to write a regexp in ascii that represents Unicode
4264 codepoints outside of the byte range, such as via \x{100}. If we
4265 detect such a sequence we have to convert the entire pattern to utf8
4266 and then recompile, as our sizing calculation will have been based
4267 on 1 byte == 1 character, but we will need to use utf8 to encode
4268 at least some part of the pattern, and therefore must convert the whole
4270 XXX: somehow figure out how to make this less expensive...
4273 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log,
4274 "UTF8 mismatch! Converting to utf8 for resizing and compile\n"));
4275 exp = (char*)Perl_bytes_to_utf8(aTHX_ (U8*)exp, &len);
4277 RExC_orig_utf8 = RExC_utf8;
4279 goto redo_first_pass;
4282 PerlIO_printf(Perl_debug_log,
4283 "Required size %"IVdf" nodes\n"
4284 "Starting second pass (creation)\n",
4287 RExC_lastparse=NULL;
4289 /* Small enough for pointer-storage convention?
4290 If extralen==0, this means that we will not need long jumps. */
4291 if (RExC_size >= 0x10000L && RExC_extralen)
4292 RExC_size += RExC_extralen;
4295 if (RExC_whilem_seen > 15)
4296 RExC_whilem_seen = 15;
4298 /* Allocate space and zero-initialize. Note, the two step process
4299 of zeroing when in debug mode, thus anything assigned has to
4300 happen after that */
4301 rx = (REGEXP*) newSV_type(SVt_REGEXP);
4302 r = (struct regexp*)SvANY(rx);
4303 Newxc(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode),
4304 char, regexp_internal);
4305 if ( r == NULL || ri == NULL )
4306 FAIL("Regexp out of space");
4308 /* avoid reading uninitialized memory in DEBUGGING code in study_chunk() */
4309 Zero(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode), char);
4311 /* bulk initialize base fields with 0. */
4312 Zero(ri, sizeof(regexp_internal), char);
4315 /* non-zero initialization begins here */
4317 r->engine= RE_ENGINE_PTR;
4318 r->extflags = pm_flags;
4320 bool has_p = ((r->extflags & RXf_PMf_KEEPCOPY) == RXf_PMf_KEEPCOPY);
4321 bool has_minus = ((r->extflags & RXf_PMf_STD_PMMOD) != RXf_PMf_STD_PMMOD);
4322 bool has_runon = ((RExC_seen & REG_SEEN_RUN_ON_COMMENT)==REG_SEEN_RUN_ON_COMMENT);
4323 U16 reganch = (U16)((r->extflags & RXf_PMf_STD_PMMOD)
4324 >> RXf_PMf_STD_PMMOD_SHIFT);
4325 const char *fptr = STD_PAT_MODS; /*"msix"*/
4327 const STRLEN wraplen = plen + has_minus + has_p + has_runon
4328 + (sizeof(STD_PAT_MODS) - 1)
4329 + (sizeof("(?:)") - 1);
4331 p = sv_grow((SV *)rx, wraplen + 1);
4332 SvCUR_set(rx, wraplen);
4334 SvFLAGS(rx) |= SvUTF8(pattern);
4337 *p++ = KEEPCOPY_PAT_MOD; /*'p'*/
4339 char *r = p + (sizeof(STD_PAT_MODS) - 1) + has_minus - 1;
4340 char *colon = r + 1;
4343 while((ch = *fptr++)) {
4357 Copy(RExC_precomp, p, plen, char);
4358 assert ((RX_WRAPPED(rx) - p) < 16);
4359 r->pre_prefix = p - RX_WRAPPED(rx);
4368 r->nparens = RExC_npar - 1; /* set early to validate backrefs */
4370 if (RExC_seen & REG_SEEN_RECURSE) {
4371 Newxz(RExC_open_parens, RExC_npar,regnode *);
4372 SAVEFREEPV(RExC_open_parens);
4373 Newxz(RExC_close_parens,RExC_npar,regnode *);
4374 SAVEFREEPV(RExC_close_parens);
4377 /* Useful during FAIL. */
4378 #ifdef RE_TRACK_PATTERN_OFFSETS
4379 Newxz(ri->u.offsets, 2*RExC_size+1, U32); /* MJD 20001228 */
4380 DEBUG_OFFSETS_r(PerlIO_printf(Perl_debug_log,
4381 "%s %"UVuf" bytes for offset annotations.\n",
4382 ri->u.offsets ? "Got" : "Couldn't get",
4383 (UV)((2*RExC_size+1) * sizeof(U32))));
4385 SetProgLen(ri,RExC_size);
4390 /* Second pass: emit code. */
4391 RExC_flags = pm_flags; /* don't let top level (?i) bleed */
4396 RExC_emit_start = ri->program;
4397 RExC_emit = ri->program;
4398 RExC_emit_bound = ri->program + RExC_size + 1;
4400 /* Store the count of eval-groups for security checks: */
4401 RExC_rx->seen_evals = RExC_seen_evals;
4402 REGC((U8)REG_MAGIC, (char*) RExC_emit++);
4403 if (reg(pRExC_state, 0, &flags,1) == NULL) {
4407 /* XXXX To minimize changes to RE engine we always allocate
4408 3-units-long substrs field. */
4409 Newx(r->substrs, 1, struct reg_substr_data);
4410 if (RExC_recurse_count) {
4411 Newxz(RExC_recurse,RExC_recurse_count,regnode *);
4412 SAVEFREEPV(RExC_recurse);
4416 r->minlen = minlen = sawplus = sawopen = 0;
4417 Zero(r->substrs, 1, struct reg_substr_data);
4419 #ifdef TRIE_STUDY_OPT
4422 DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log,"Restudying\n"));
4424 RExC_state = copyRExC_state;
4425 if (seen & REG_TOP_LEVEL_BRANCHES)
4426 RExC_seen |= REG_TOP_LEVEL_BRANCHES;
4428 RExC_seen &= ~REG_TOP_LEVEL_BRANCHES;
4429 if (data.last_found) {
4430 SvREFCNT_dec(data.longest_fixed);
4431 SvREFCNT_dec(data.longest_float);
4432 SvREFCNT_dec(data.last_found);
4434 StructCopy(&zero_scan_data, &data, scan_data_t);
4436 StructCopy(&zero_scan_data, &data, scan_data_t);
4437 copyRExC_state = RExC_state;
4440 StructCopy(&zero_scan_data, &data, scan_data_t);
4443 /* Dig out information for optimizations. */
4444 r->extflags = RExC_flags; /* was pm_op */
4445 /*dmq: removed as part of de-PMOP: pm->op_pmflags = RExC_flags; */
4448 SvUTF8_on(rx); /* Unicode in it? */
4449 ri->regstclass = NULL;
4450 if (RExC_naughty >= 10) /* Probably an expensive pattern. */
4451 r->intflags |= PREGf_NAUGHTY;
4452 scan = ri->program + 1; /* First BRANCH. */
4454 /* testing for BRANCH here tells us whether there is "must appear"
4455 data in the pattern. If there is then we can use it for optimisations */
4456 if (!(RExC_seen & REG_TOP_LEVEL_BRANCHES)) { /* Only one top-level choice. */
4458 STRLEN longest_float_length, longest_fixed_length;
4459 struct regnode_charclass_class ch_class; /* pointed to by data */
4461 I32 last_close = 0; /* pointed to by data */
4462 regnode *first= scan;
4463 regnode *first_next= regnext(first);
4466 * Skip introductions and multiplicators >= 1
4467 * so that we can extract the 'meat' of the pattern that must
4468 * match in the large if() sequence following.
4469 * NOTE that EXACT is NOT covered here, as it is normally
4470 * picked up by the optimiser separately.
4472 * This is unfortunate as the optimiser isnt handling lookahead
4473 * properly currently.
4476 while ((OP(first) == OPEN && (sawopen = 1)) ||
4477 /* An OR of *one* alternative - should not happen now. */
4478 (OP(first) == BRANCH && OP(first_next) != BRANCH) ||
4479 /* for now we can't handle lookbehind IFMATCH*/
4480 (OP(first) == IFMATCH && !first->flags) ||
4481 (OP(first) == PLUS) ||
4482 (OP(first) == MINMOD) ||
4483 /* An {n,m} with n>0 */
4484 (PL_regkind[OP(first)] == CURLY && ARG1(first) > 0) ||
4485 (OP(first) == NOTHING && PL_regkind[OP(first_next)] != END ))
4488 * the only op that could be a regnode is PLUS, all the rest
4489 * will be regnode_1 or regnode_2.
4492 if (OP(first) == PLUS)
4495 first += regarglen[OP(first)];
4497 first = NEXTOPER(first);
4498 first_next= regnext(first);
4501 /* Starting-point info. */
4503 DEBUG_PEEP("first:",first,0);
4504 /* Ignore EXACT as we deal with it later. */
4505 if (PL_regkind[OP(first)] == EXACT) {
4506 if (OP(first) == EXACT)
4507 NOOP; /* Empty, get anchored substr later. */
4508 else if ((OP(first) == EXACTF || OP(first) == EXACTFL))
4509 ri->regstclass = first;
4512 else if (PL_regkind[OP(first)] == TRIE &&
4513 ((reg_trie_data *)ri->data->data[ ARG(first) ])->minlen>0)
4516 /* this can happen only on restudy */
4517 if ( OP(first) == TRIE ) {
4518 struct regnode_1 *trieop = (struct regnode_1 *)
4519 PerlMemShared_calloc(1, sizeof(struct regnode_1));
4520 StructCopy(first,trieop,struct regnode_1);
4521 trie_op=(regnode *)trieop;
4523 struct regnode_charclass *trieop = (struct regnode_charclass *)
4524 PerlMemShared_calloc(1, sizeof(struct regnode_charclass));
4525 StructCopy(first,trieop,struct regnode_charclass);
4526 trie_op=(regnode *)trieop;
4529 make_trie_failtable(pRExC_state, (regnode *)first, trie_op, 0);
4530 ri->regstclass = trie_op;
4533 else if (strchr((const char*)PL_simple,OP(first)))
4534 ri->regstclass = first;
4535 else if (PL_regkind[OP(first)] == BOUND ||
4536 PL_regkind[OP(first)] == NBOUND)
4537 ri->regstclass = first;
4538 else if (PL_regkind[OP(first)] == BOL) {
4539 r->extflags |= (OP(first) == MBOL
4541 : (OP(first) == SBOL
4544 first = NEXTOPER(first);
4547 else if (OP(first) == GPOS) {
4548 r->extflags |= RXf_ANCH_GPOS;
4549 first = NEXTOPER(first);
4552 else if ((!sawopen || !RExC_sawback) &&
4553 (OP(first) == STAR &&
4554 PL_regkind[OP(NEXTOPER(first))] == REG_ANY) &&
4555 !(r->extflags & RXf_ANCH) && !(RExC_seen & REG_SEEN_EVAL))
4557 /* turn .* into ^.* with an implied $*=1 */
4559 (OP(NEXTOPER(first)) == REG_ANY)
4562 r->extflags |= type;
4563 r->intflags |= PREGf_IMPLICIT;
4564 first = NEXTOPER(first);
4567 if (sawplus && (!sawopen || !RExC_sawback)
4568 && !(RExC_seen & REG_SEEN_EVAL)) /* May examine pos and $& */
4569 /* x+ must match at the 1st pos of run of x's */
4570 r->intflags |= PREGf_SKIP;
4572 /* Scan is after the zeroth branch, first is atomic matcher. */
4573 #ifdef TRIE_STUDY_OPT
4576 PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
4577 (IV)(first - scan + 1))
4581 PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
4582 (IV)(first - scan + 1))
4588 * If there's something expensive in the r.e., find the
4589 * longest literal string that must appear and make it the
4590 * regmust. Resolve ties in favor of later strings, since
4591 * the regstart check works with the beginning of the r.e.
4592 * and avoiding duplication strengthens checking. Not a
4593 * strong reason, but sufficient in the absence of others.
4594 * [Now we resolve ties in favor of the earlier string if
4595 * it happens that c_offset_min has been invalidated, since the
4596 * earlier string may buy us something the later one won't.]
4599 data.longest_fixed = newSVpvs("");
4600 data.longest_float = newSVpvs("");
4601 data.last_found = newSVpvs("");
4602 data.longest = &(data.longest_fixed);
4604 if (!ri->regstclass) {
4605 cl_init(pRExC_state, &ch_class);
4606 data.start_class = &ch_class;
4607 stclass_flag = SCF_DO_STCLASS_AND;
4608 } else /* XXXX Check for BOUND? */
4610 data.last_closep = &last_close;
4612 minlen = study_chunk(pRExC_state, &first, &minlen, &fake, scan + RExC_size, /* Up to end */
4613 &data, -1, NULL, NULL,
4614 SCF_DO_SUBSTR | SCF_WHILEM_VISITED_POS | stclass_flag,0);
4620 if ( RExC_npar == 1 && data.longest == &(data.longest_fixed)
4621 && data.last_start_min == 0 && data.last_end > 0
4622 && !RExC_seen_zerolen
4623 && !(RExC_seen & REG_SEEN_VERBARG)
4624 && (!(RExC_seen & REG_SEEN_GPOS) || (r->extflags & RXf_ANCH_GPOS)))
4625 r->extflags |= RXf_CHECK_ALL;
4626 scan_commit(pRExC_state, &data,&minlen,0);
4627 SvREFCNT_dec(data.last_found);
4629 /* Note that code very similar to this but for anchored string
4630 follows immediately below, changes may need to be made to both.
4633 longest_float_length = CHR_SVLEN(data.longest_float);
4634 if (longest_float_length
4635 || (data.flags & SF_FL_BEFORE_EOL
4636 && (!(data.flags & SF_FL_BEFORE_MEOL)
4637 || (RExC_flags & RXf_PMf_MULTILINE))))
4641 if (SvCUR(data.longest_fixed) /* ok to leave SvCUR */
4642 && data.offset_fixed == data.offset_float_min
4643 && SvCUR(data.longest_fixed) == SvCUR(data.longest_float))
4644 goto remove_float; /* As in (a)+. */
4646 /* copy the information about the longest float from the reg_scan_data
4647 over to the program. */
4648 if (SvUTF8(data.longest_float)) {
4649 r->float_utf8 = data.longest_float;
4650 r->float_substr = NULL;
4652 r->float_substr = data.longest_float;
4653 r->float_utf8 = NULL;
4655 /* float_end_shift is how many chars that must be matched that
4656 follow this item. We calculate it ahead of time as once the
4657 lookbehind offset is added in we lose the ability to correctly
4659 ml = data.minlen_float ? *(data.minlen_float)
4660 : (I32)longest_float_length;
4661 r->float_end_shift = ml - data.offset_float_min
4662 - longest_float_length + (SvTAIL(data.longest_float) != 0)
4663 + data.lookbehind_float;
4664 r->float_min_offset = data.offset_float_min - data.lookbehind_float;
4665 r->float_max_offset = data.offset_float_max;
4666 if (data.offset_float_max < I32_MAX) /* Don't offset infinity */
4667 r->float_max_offset -= data.lookbehind_float;
4669 t = (data.flags & SF_FL_BEFORE_EOL /* Can't have SEOL and MULTI */
4670 && (!(data.flags & SF_FL_BEFORE_MEOL)
4671 || (RExC_flags & RXf_PMf_MULTILINE)));
4672 fbm_compile(data.longest_float, t ? FBMcf_TAIL : 0);
4676 r->float_substr = r->float_utf8 = NULL;
4677 SvREFCNT_dec(data.longest_float);
4678 longest_float_length = 0;
4681 /* Note that code very similar to this but for floating string
4682 is immediately above, changes may need to be made to both.
4685 longest_fixed_length = CHR_SVLEN(data.longest_fixed);
4686 if (longest_fixed_length
4687 || (data.flags & SF_FIX_BEFORE_EOL /* Cannot have SEOL and MULTI */
4688 && (!(data.flags & SF_FIX_BEFORE_MEOL)
4689 || (RExC_flags & RXf_PMf_MULTILINE))))
4693 /* copy the information about the longest fixed
4694 from the reg_scan_data over to the program. */
4695 if (SvUTF8(data.longest_fixed)) {
4696 r->anchored_utf8 = data.longest_fixed;
4697 r->anchored_substr = NULL;
4699 r->anchored_substr = data.longest_fixed;
4700 r->anchored_utf8 = NULL;
4702 /* fixed_end_shift is how many chars that must be matched that
4703 follow this item. We calculate it ahead of time as once the
4704 lookbehind offset is added in we lose the ability to correctly
4706 ml = data.minlen_fixed ? *(data.minlen_fixed)
4707 : (I32)longest_fixed_length;
4708 r->anchored_end_shift = ml - data.offset_fixed
4709 - longest_fixed_length + (SvTAIL(data.longest_fixed) != 0)
4710 + data.lookbehind_fixed;
4711 r->anchored_offset = data.offset_fixed - data.lookbehind_fixed;
4713 t = (data.flags & SF_FIX_BEFORE_EOL /* Can't have SEOL and MULTI */
4714 && (!(data.flags & SF_FIX_BEFORE_MEOL)
4715 || (RExC_flags & RXf_PMf_MULTILINE)));
4716 fbm_compile(data.longest_fixed, t ? FBMcf_TAIL : 0);
4719 r->anchored_substr = r->anchored_utf8 = NULL;
4720 SvREFCNT_dec(data.longest_fixed);
4721 longest_fixed_length = 0;
4724 && (OP(ri->regstclass) == REG_ANY || OP(ri->regstclass) == SANY))
4725 ri->regstclass = NULL;
4726 if ((!(r->anchored_substr || r->anchored_utf8) || r->anchored_offset)
4728 && !(data.start_class->flags & ANYOF_EOS)
4729 && !cl_is_anything(data.start_class))
4731 const U32 n = add_data(pRExC_state, 1, "f");
4733 Newx(RExC_rxi->data->data[n], 1,
4734 struct regnode_charclass_class);
4735 StructCopy(data.start_class,
4736 (struct regnode_charclass_class*)RExC_rxi->data->data[n],
4737 struct regnode_charclass_class);
4738 ri->regstclass = (regnode*)RExC_rxi->data->data[n];
4739 r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
4740 DEBUG_COMPILE_r({ SV *sv = sv_newmortal();
4741 regprop(r, sv, (regnode*)data.start_class);
4742 PerlIO_printf(Perl_debug_log,
4743 "synthetic stclass \"%s\".\n",
4744 SvPVX_const(sv));});
4747 /* A temporary algorithm prefers floated substr to fixed one to dig more info. */
4748 if (longest_fixed_length > longest_float_length) {
4749 r->check_end_shift = r->anchored_end_shift;
4750 r->check_substr = r->anchored_substr;
4751 r->check_utf8 = r->anchored_utf8;
4752 r->check_offset_min = r->check_offset_max = r->anchored_offset;
4753 if (r->extflags & RXf_ANCH_SINGLE)
4754 r->extflags |= RXf_NOSCAN;
4757 r->check_end_shift = r->float_end_shift;
4758 r->check_substr = r->float_substr;
4759 r->check_utf8 = r->float_utf8;
4760 r->check_offset_min = r->float_min_offset;
4761 r->check_offset_max = r->float_max_offset;
4763 /* XXXX Currently intuiting is not compatible with ANCH_GPOS.
4764 This should be changed ASAP! */
4765 if ((r->check_substr || r->check_utf8) && !(r->extflags & RXf_ANCH_GPOS)) {
4766 r->extflags |= RXf_USE_INTUIT;
4767 if (SvTAIL(r->check_substr ? r->check_substr : r->check_utf8))
4768 r->extflags |= RXf_INTUIT_TAIL;
4770 /* XXX Unneeded? dmq (shouldn't as this is handled elsewhere)
4771 if ( (STRLEN)minlen < longest_float_length )
4772 minlen= longest_float_length;
4773 if ( (STRLEN)minlen < longest_fixed_length )
4774 minlen= longest_fixed_length;
4778 /* Several toplevels. Best we can is to set minlen. */
4780 struct regnode_charclass_class ch_class;
4783 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log, "\nMulti Top Level\n"));
4785 scan = ri->program + 1;
4786 cl_init(pRExC_state, &ch_class);
4787 data.start_class = &ch_class;
4788 data.last_closep = &last_close;
4791 minlen = study_chunk(pRExC_state, &scan, &minlen, &fake, scan + RExC_size,
4792 &data, -1, NULL, NULL, SCF_DO_STCLASS_AND|SCF_WHILEM_VISITED_POS,0);
4796 r->check_substr = r->check_utf8 = r->anchored_substr = r->anchored_utf8
4797 = r->float_substr = r->float_utf8 = NULL;
4798 if (!(data.start_class->flags & ANYOF_EOS)
4799 && !cl_is_anything(data.start_class))
4801 const U32 n = add_data(pRExC_state, 1, "f");
4803 Newx(RExC_rxi->data->data[n], 1,
4804 struct regnode_charclass_class);
4805 StructCopy(data.start_class,
4806 (struct regnode_charclass_class*)RExC_rxi->data->data[n],
4807 struct regnode_charclass_class);
4808 ri->regstclass = (regnode*)RExC_rxi->data->data[n];
4809 r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
4810 DEBUG_COMPILE_r({ SV* sv = sv_newmortal();
4811 regprop(r, sv, (regnode*)data.start_class);
4812 PerlIO_printf(Perl_debug_log,
4813 "synthetic stclass \"%s\".\n",
4814 SvPVX_const(sv));});
4818 /* Guard against an embedded (?=) or (?<=) with a longer minlen than
4819 the "real" pattern. */
4821 PerlIO_printf(Perl_debug_log,"minlen: %"IVdf" r->minlen:%"IVdf"\n",
4822 (IV)minlen, (IV)r->minlen);
4824 r->minlenret = minlen;
4825 if (r->minlen < minlen)
4828 if (RExC_seen & REG_SEEN_GPOS)
4829 r->extflags |= RXf_GPOS_SEEN;
4830 if (RExC_seen & REG_SEEN_LOOKBEHIND)
4831 r->extflags |= RXf_LOOKBEHIND_SEEN;
4832 if (RExC_seen & REG_SEEN_EVAL)
4833 r->extflags |= RXf_EVAL_SEEN;
4834 if (RExC_seen & REG_SEEN_CANY)
4835 r->extflags |= RXf_CANY_SEEN;
4836 if (RExC_seen & REG_SEEN_VERBARG)
4837 r->intflags |= PREGf_VERBARG_SEEN;
4838 if (RExC_seen & REG_SEEN_CUTGROUP)
4839 r->intflags |= PREGf_CUTGROUP_SEEN;
4840 if (RExC_paren_names)
4841 RXp_PAREN_NAMES(r) = (HV*)SvREFCNT_inc(RExC_paren_names);
4843 RXp_PAREN_NAMES(r) = NULL;
4845 #ifdef STUPID_PATTERN_CHECKS
4846 if (RX_PRELEN(rx) == 0)
4847 r->extflags |= RXf_NULL;
4848 if (r->extflags & RXf_SPLIT && RX_PRELEN(rx) == 1 && RX_PRECOMP(rx)[0] == ' ')
4849 /* XXX: this should happen BEFORE we compile */
4850 r->extflags |= (RXf_SKIPWHITE|RXf_WHITE);
4851 else if (RX_PRELEN(rx) == 3 && memEQ("\\s+", RX_PRECOMP(rx), 3))
4852 r->extflags |= RXf_WHITE;
4853 else if (RX_PRELEN(rx) == 1 && RXp_PRECOMP(rx)[0] == '^')
4854 r->extflags |= RXf_START_ONLY;
4856 if (r->extflags & RXf_SPLIT && RX_PRELEN(rx) == 1 && RX_PRECOMP(rx)[0] == ' ')
4857 /* XXX: this should happen BEFORE we compile */
4858 r->extflags |= (RXf_SKIPWHITE|RXf_WHITE);
4860 regnode *first = ri->program + 1;
4862 U8 nop = OP(NEXTOPER(first));
4864 if (PL_regkind[fop] == NOTHING && nop == END)
4865 r->extflags |= RXf_NULL;
4866 else if (PL_regkind[fop] == BOL && nop == END)
4867 r->extflags |= RXf_START_ONLY;
4868 else if (fop == PLUS && nop ==SPACE && OP(regnext(first))==END)
4869 r->extflags |= RXf_WHITE;
4873 if (RExC_paren_names) {
4874 ri->name_list_idx = add_data( pRExC_state, 1, "p" );
4875 ri->data->data[ri->name_list_idx] = (void*)SvREFCNT_inc(RExC_paren_name_list);
4878 ri->name_list_idx = 0;
4880 if (RExC_recurse_count) {
4881 for ( ; RExC_recurse_count ; RExC_recurse_count-- ) {
4882 const regnode *scan = RExC_recurse[RExC_recurse_count-1];
4883 ARG2L_SET( scan, RExC_open_parens[ARG(scan)-1] - scan );
4886 Newxz(r->offs, RExC_npar, regexp_paren_pair);
4887 /* assume we don't need to swap parens around before we match */
4890 PerlIO_printf(Perl_debug_log,"Final program:\n");
4893 #ifdef RE_TRACK_PATTERN_OFFSETS
4894 DEBUG_OFFSETS_r(if (ri->u.offsets) {
4895 const U32 len = ri->u.offsets[0];
4897 GET_RE_DEBUG_FLAGS_DECL;
4898 PerlIO_printf(Perl_debug_log, "Offsets: [%"UVuf"]\n\t", (UV)ri->u.offsets[0]);
4899 for (i = 1; i <= len; i++) {
4900 if (ri->u.offsets[i*2-1] || ri->u.offsets[i*2])
4901 PerlIO_printf(Perl_debug_log, "%"UVuf":%"UVuf"[%"UVuf"] ",
4902 (UV)i, (UV)ri->u.offsets[i*2-1], (UV)ri->u.offsets[i*2]);
4904 PerlIO_printf(Perl_debug_log, "\n");
4910 #undef RE_ENGINE_PTR
4914 Perl_reg_named_buff(pTHX_ REGEXP * const rx, SV * const key, SV * const value,
4917 PERL_ARGS_ASSERT_REG_NAMED_BUFF;
4919 PERL_UNUSED_ARG(value);
4921 if (flags & RXapif_FETCH) {
4922 return reg_named_buff_fetch(rx, key, flags);
4923 } else if (flags & (RXapif_STORE | RXapif_DELETE | RXapif_CLEAR)) {
4924 Perl_croak(aTHX_ PL_no_modify);
4926 } else if (flags & RXapif_EXISTS) {
4927 return reg_named_buff_exists(rx, key, flags)
4930 } else if (flags & RXapif_REGNAMES) {
4931 return reg_named_buff_all(rx, flags);
4932 } else if (flags & (RXapif_SCALAR | RXapif_REGNAMES_COUNT)) {
4933 return reg_named_buff_scalar(rx, flags);
4935 Perl_croak(aTHX_ "panic: Unknown flags %d in named_buff", (int)flags);
4941 Perl_reg_named_buff_iter(pTHX_ REGEXP * const rx, const SV * const lastkey,
4944 PERL_ARGS_ASSERT_REG_NAMED_BUFF_ITER;
4945 PERL_UNUSED_ARG(lastkey);
4947 if (flags & RXapif_FIRSTKEY)
4948 return reg_named_buff_firstkey(rx, flags);
4949 else if (flags & RXapif_NEXTKEY)
4950 return reg_named_buff_nextkey(rx, flags);
4952 Perl_croak(aTHX_ "panic: Unknown flags %d in named_buff_iter", (int)flags);
4958 Perl_reg_named_buff_fetch(pTHX_ REGEXP * const r, SV * const namesv,
4961 AV *retarray = NULL;
4963 struct regexp *const rx = (struct regexp *)SvANY(r);
4965 PERL_ARGS_ASSERT_REG_NAMED_BUFF_FETCH;
4967 if (flags & RXapif_ALL)
4970 if (rx && RXp_PAREN_NAMES(rx)) {
4971 HE *he_str = hv_fetch_ent( RXp_PAREN_NAMES(rx), namesv, 0, 0 );
4974 SV* sv_dat=HeVAL(he_str);
4975 I32 *nums=(I32*)SvPVX(sv_dat);
4976 for ( i=0; i<SvIVX(sv_dat); i++ ) {
4977 if ((I32)(rx->nparens) >= nums[i]
4978 && rx->offs[nums[i]].start != -1
4979 && rx->offs[nums[i]].end != -1)
4982 CALLREG_NUMBUF_FETCH(r,nums[i],ret);
4986 ret = newSVsv(&PL_sv_undef);
4989 SvREFCNT_inc_simple_void(ret);
4990 av_push(retarray, ret);
4994 return newRV((SV*)retarray);
5001 Perl_reg_named_buff_exists(pTHX_ REGEXP * const r, SV * const key,
5004 struct regexp *const rx = (struct regexp *)SvANY(r);
5006 PERL_ARGS_ASSERT_REG_NAMED_BUFF_EXISTS;
5008 if (rx && RXp_PAREN_NAMES(rx)) {
5009 if (flags & RXapif_ALL) {
5010 return hv_exists_ent(RXp_PAREN_NAMES(rx), key, 0);
5012 SV *sv = CALLREG_NAMED_BUFF_FETCH(r, key, flags);
5026 Perl_reg_named_buff_firstkey(pTHX_ REGEXP * const r, const U32 flags)
5028 struct regexp *const rx = (struct regexp *)SvANY(r);
5030 PERL_ARGS_ASSERT_REG_NAMED_BUFF_FIRSTKEY;
5032 if ( rx && RXp_PAREN_NAMES(rx) ) {
5033 (void)hv_iterinit(RXp_PAREN_NAMES(rx));
5035 return CALLREG_NAMED_BUFF_NEXTKEY(r, NULL, flags & ~RXapif_FIRSTKEY);
5042 Perl_reg_named_buff_nextkey(pTHX_ REGEXP * const r, const U32 flags)
5044 struct regexp *const rx = (struct regexp *)SvANY(r);
5046 PERL_ARGS_ASSERT_REG_NAMED_BUFF_NEXTKEY;
5048 if (rx && RXp_PAREN_NAMES(rx)) {
5049 HV *hv = RXp_PAREN_NAMES(rx);
5051 while ( (temphe = hv_iternext_flags(hv,0)) ) {
5054 SV* sv_dat = HeVAL(temphe);
5055 I32 *nums = (I32*)SvPVX(sv_dat);
5056 for ( i = 0; i < SvIVX(sv_dat); i++ ) {
5057 if ((I32)(rx->lastcloseparen) >= nums[i] &&
5058 rx->offs[nums[i]].start != -1 &&
5059 rx->offs[nums[i]].end != -1)
5065 if (parno || flags & RXapif_ALL) {
5066 return newSVhek(HeKEY_hek(temphe));
5074 Perl_reg_named_buff_scalar(pTHX_ REGEXP * const r, const U32 flags)
5079 struct regexp *const rx = (struct regexp *)SvANY(r);
5081 PERL_ARGS_ASSERT_REG_NAMED_BUFF_SCALAR;
5083 if (rx && RXp_PAREN_NAMES(rx)) {
5084 if (flags & (RXapif_ALL | RXapif_REGNAMES_COUNT)) {
5085 return newSViv(HvTOTALKEYS(RXp_PAREN_NAMES(rx)));
5086 } else if (flags & RXapif_ONE) {
5087 ret = CALLREG_NAMED_BUFF_ALL(r, (flags | RXapif_REGNAMES));
5088 av = (AV*)SvRV(ret);
5089 length = av_len(av);
5090 return newSViv(length + 1);
5092 Perl_croak(aTHX_ "panic: Unknown flags %d in named_buff_scalar", (int)flags);
5096 return &PL_sv_undef;
5100 Perl_reg_named_buff_all(pTHX_ REGEXP * const r, const U32 flags)
5102 struct regexp *const rx = (struct regexp *)SvANY(r);
5105 PERL_ARGS_ASSERT_REG_NAMED_BUFF_ALL;
5107 if (rx && RXp_PAREN_NAMES(rx)) {
5108 HV *hv= RXp_PAREN_NAMES(rx);
5110 (void)hv_iterinit(hv);
5111 while ( (temphe = hv_iternext_flags(hv,0)) ) {
5114 SV* sv_dat = HeVAL(temphe);
5115 I32 *nums = (I32*)SvPVX(sv_dat);
5116 for ( i = 0; i < SvIVX(sv_dat); i++ ) {
5117 if ((I32)(rx->lastcloseparen) >= nums[i] &&
5118 rx->offs[nums[i]].start != -1 &&
5119 rx->offs[nums[i]].end != -1)
5125 if (parno || flags & RXapif_ALL) {
5126 av_push(av, newSVhek(HeKEY_hek(temphe)));
5131 return newRV((SV*)av);
5135 Perl_reg_numbered_buff_fetch(pTHX_ REGEXP * const r, const I32 paren,
5138 struct regexp *const rx = (struct regexp *)SvANY(r);
5143 PERL_ARGS_ASSERT_REG_NUMBERED_BUFF_FETCH;
5146 sv_setsv(sv,&PL_sv_undef);
5150 if (paren == RX_BUFF_IDX_PREMATCH && rx->offs[0].start != -1) {
5152 i = rx->offs[0].start;
5156 if (paren == RX_BUFF_IDX_POSTMATCH && rx->offs[0].end != -1) {
5158 s = rx->subbeg + rx->offs[0].end;
5159 i = rx->sublen - rx->offs[0].end;
5162 if ( 0 <= paren && paren <= (I32)rx->nparens &&
5163 (s1 = rx->offs[paren].start) != -1 &&
5164 (t1 = rx->offs[paren].end) != -1)
5168 s = rx->subbeg + s1;
5170 sv_setsv(sv,&PL_sv_undef);
5173 assert(rx->sublen >= (s - rx->subbeg) + i );
5175 const int oldtainted = PL_tainted;
5177 sv_setpvn(sv, s, i);
5178 PL_tainted = oldtainted;
5179 if ( (rx->extflags & RXf_CANY_SEEN)
5180 ? (RXp_MATCH_UTF8(rx)
5181 && (!i || is_utf8_string((U8*)s, i)))
5182 : (RXp_MATCH_UTF8(rx)) )
5189 if (RXp_MATCH_TAINTED(rx)) {
5190 if (SvTYPE(sv) >= SVt_PVMG) {
5191 MAGIC* const mg = SvMAGIC(sv);
5194 SvMAGIC_set(sv, mg->mg_moremagic);
5196 if ((mgt = SvMAGIC(sv))) {
5197 mg->mg_moremagic = mgt;
5198 SvMAGIC_set(sv, mg);
5208 sv_setsv(sv,&PL_sv_undef);
5214 Perl_reg_numbered_buff_store(pTHX_ REGEXP * const rx, const I32 paren,
5215 SV const * const value)
5217 PERL_ARGS_ASSERT_REG_NUMBERED_BUFF_STORE;
5219 PERL_UNUSED_ARG(rx);
5220 PERL_UNUSED_ARG(paren);
5221 PERL_UNUSED_ARG(value);
5224 Perl_croak(aTHX_ PL_no_modify);
5228 Perl_reg_numbered_buff_length(pTHX_ REGEXP * const r, const SV * const sv,
5231 struct regexp *const rx = (struct regexp *)SvANY(r);
5235 PERL_ARGS_ASSERT_REG_NUMBERED_BUFF_LENGTH;
5237 /* Some of this code was originally in C<Perl_magic_len> in F<mg.c> */
5239 /* $` / ${^PREMATCH} */
5240 case RX_BUFF_IDX_PREMATCH:
5241 if (rx->offs[0].start != -1) {
5242 i = rx->offs[0].start;
5250 /* $' / ${^POSTMATCH} */
5251 case RX_BUFF_IDX_POSTMATCH:
5252 if (rx->offs[0].end != -1) {
5253 i = rx->sublen - rx->offs[0].end;
5255 s1 = rx->offs[0].end;
5261 /* $& / ${^MATCH}, $1, $2, ... */
5263 if (paren <= (I32)rx->nparens &&
5264 (s1 = rx->offs[paren].start) != -1 &&
5265 (t1 = rx->offs[paren].end) != -1)
5270 if (ckWARN(WARN_UNINITIALIZED))
5271 report_uninit((SV*)sv);
5276 if (i > 0 && RXp_MATCH_UTF8(rx)) {
5277 const char * const s = rx->subbeg + s1;
5282 if (is_utf8_string_loclen((U8*)s, i, &ep, &el))
5289 Perl_reg_qr_package(pTHX_ REGEXP * const rx)
5291 PERL_ARGS_ASSERT_REG_QR_PACKAGE;
5292 PERL_UNUSED_ARG(rx);
5296 return newSVpvs("Regexp");
5299 /* Scans the name of a named buffer from the pattern.
5300 * If flags is REG_RSN_RETURN_NULL returns null.
5301 * If flags is REG_RSN_RETURN_NAME returns an SV* containing the name
5302 * If flags is REG_RSN_RETURN_DATA returns the data SV* corresponding
5303 * to the parsed name as looked up in the RExC_paren_names hash.
5304 * If there is an error throws a vFAIL().. type exception.
5307 #define REG_RSN_RETURN_NULL 0
5308 #define REG_RSN_RETURN_NAME 1
5309 #define REG_RSN_RETURN_DATA 2
5312 S_reg_scan_name(pTHX_ RExC_state_t *pRExC_state, U32 flags)
5314 char *name_start = RExC_parse;
5316 PERL_ARGS_ASSERT_REG_SCAN_NAME;
5318 if (isIDFIRST_lazy_if(RExC_parse, UTF)) {
5319 /* skip IDFIRST by using do...while */
5322 RExC_parse += UTF8SKIP(RExC_parse);
5323 } while (isALNUM_utf8((U8*)RExC_parse));
5327 } while (isALNUM(*RExC_parse));
5332 = newSVpvn_flags(name_start, (int)(RExC_parse - name_start),
5333 SVs_TEMP | (UTF ? SVf_UTF8 : 0));
5334 if ( flags == REG_RSN_RETURN_NAME)
5336 else if (flags==REG_RSN_RETURN_DATA) {
5339 if ( ! sv_name ) /* should not happen*/
5340 Perl_croak(aTHX_ "panic: no svname in reg_scan_name");
5341 if (RExC_paren_names)
5342 he_str = hv_fetch_ent( RExC_paren_names, sv_name, 0, 0 );
5344 sv_dat = HeVAL(he_str);
5346 vFAIL("Reference to nonexistent named group");
5350 Perl_croak(aTHX_ "panic: bad flag in reg_scan_name");
5357 #define DEBUG_PARSE_MSG(funcname) DEBUG_PARSE_r({ \
5358 int rem=(int)(RExC_end - RExC_parse); \
5367 if (RExC_lastparse!=RExC_parse) \
5368 PerlIO_printf(Perl_debug_log," >%.*s%-*s", \
5371 iscut ? "..." : "<" \
5374 PerlIO_printf(Perl_debug_log,"%16s",""); \
5377 num = RExC_size + 1; \
5379 num=REG_NODE_NUM(RExC_emit); \
5380 if (RExC_lastnum!=num) \
5381 PerlIO_printf(Perl_debug_log,"|%4d",num); \
5383 PerlIO_printf(Perl_debug_log,"|%4s",""); \
5384 PerlIO_printf(Perl_debug_log,"|%*s%-4s", \
5385 (int)((depth*2)), "", \
5389 RExC_lastparse=RExC_parse; \
5394 #define DEBUG_PARSE(funcname) DEBUG_PARSE_r({ \
5395 DEBUG_PARSE_MSG((funcname)); \
5396 PerlIO_printf(Perl_debug_log,"%4s","\n"); \
5398 #define DEBUG_PARSE_FMT(funcname,fmt,args) DEBUG_PARSE_r({ \
5399 DEBUG_PARSE_MSG((funcname)); \
5400 PerlIO_printf(Perl_debug_log,fmt "\n",args); \
5403 - reg - regular expression, i.e. main body or parenthesized thing
5405 * Caller must absorb opening parenthesis.
5407 * Combining parenthesis handling with the base level of regular expression
5408 * is a trifle forced, but the need to tie the tails of the branches to what
5409 * follows makes it hard to avoid.
5411 #define REGTAIL(x,y,z) regtail((x),(y),(z),depth+1)
5413 #define REGTAIL_STUDY(x,y,z) regtail_study((x),(y),(z),depth+1)
5415 #define REGTAIL_STUDY(x,y,z) regtail((x),(y),(z),depth+1)
5419 S_reg(pTHX_ RExC_state_t *pRExC_state, I32 paren, I32 *flagp,U32 depth)
5420 /* paren: Parenthesized? 0=top, 1=(, inside: changed to letter. */
5423 register regnode *ret; /* Will be the head of the group. */
5424 register regnode *br;
5425 register regnode *lastbr;
5426 register regnode *ender = NULL;
5427 register I32 parno = 0;
5429 U32 oregflags = RExC_flags;
5430 bool have_branch = 0;
5432 I32 freeze_paren = 0;
5433 I32 after_freeze = 0;
5435 /* for (?g), (?gc), and (?o) warnings; warning
5436 about (?c) will warn about (?g) -- japhy */
5438 #define WASTED_O 0x01
5439 #define WASTED_G 0x02
5440 #define WASTED_C 0x04
5441 #define WASTED_GC (0x02|0x04)
5442 I32 wastedflags = 0x00;
5444 char * parse_start = RExC_parse; /* MJD */
5445 char * const oregcomp_parse = RExC_parse;
5447 GET_RE_DEBUG_FLAGS_DECL;
5449 PERL_ARGS_ASSERT_REG;
5450 DEBUG_PARSE("reg ");
5452 *flagp = 0; /* Tentatively. */
5455 /* Make an OPEN node, if parenthesized. */
5457 if ( *RExC_parse == '*') { /* (*VERB:ARG) */
5458 char *start_verb = RExC_parse;
5459 STRLEN verb_len = 0;
5460 char *start_arg = NULL;
5461 unsigned char op = 0;
5463 int internal_argval = 0; /* internal_argval is only useful if !argok */
5464 while ( *RExC_parse && *RExC_parse != ')' ) {
5465 if ( *RExC_parse == ':' ) {
5466 start_arg = RExC_parse + 1;
5472 verb_len = RExC_parse - start_verb;
5475 while ( *RExC_parse && *RExC_parse != ')' )
5477 if ( *RExC_parse != ')' )
5478 vFAIL("Unterminated verb pattern argument");
5479 if ( RExC_parse == start_arg )
5482 if ( *RExC_parse != ')' )
5483 vFAIL("Unterminated verb pattern");
5486 switch ( *start_verb ) {
5487 case 'A': /* (*ACCEPT) */
5488 if ( memEQs(start_verb,verb_len,"ACCEPT") ) {
5490 internal_argval = RExC_nestroot;
5493 case 'C': /* (*COMMIT) */
5494 if ( memEQs(start_verb,verb_len,"COMMIT") )
5497 case 'F': /* (*FAIL) */
5498 if ( verb_len==1 || memEQs(start_verb,verb_len,"FAIL") ) {
5503 case ':': /* (*:NAME) */
5504 case 'M': /* (*MARK:NAME) */
5505 if ( verb_len==0 || memEQs(start_verb,verb_len,"MARK") ) {
5510 case 'P': /* (*PRUNE) */
5511 if ( memEQs(start_verb,verb_len,"PRUNE") )
5514 case 'S': /* (*SKIP) */
5515 if ( memEQs(start_verb,verb_len,"SKIP") )
5518 case 'T': /* (*THEN) */
5519 /* [19:06] <TimToady> :: is then */
5520 if ( memEQs(start_verb,verb_len,"THEN") ) {
5522 RExC_seen |= REG_SEEN_CUTGROUP;
5528 vFAIL3("Unknown verb pattern '%.*s'",
5529 verb_len, start_verb);
5532 if ( start_arg && internal_argval ) {
5533 vFAIL3("Verb pattern '%.*s' may not have an argument",
5534 verb_len, start_verb);
5535 } else if ( argok < 0 && !start_arg ) {
5536 vFAIL3("Verb pattern '%.*s' has a mandatory argument",
5537 verb_len, start_verb);
5539 ret = reganode(pRExC_state, op, internal_argval);
5540 if ( ! internal_argval && ! SIZE_ONLY ) {
5542 SV *sv = newSVpvn( start_arg, RExC_parse - start_arg);
5543 ARG(ret) = add_data( pRExC_state, 1, "S" );
5544 RExC_rxi->data->data[ARG(ret)]=(void*)sv;
5551 if (!internal_argval)
5552 RExC_seen |= REG_SEEN_VERBARG;
5553 } else if ( start_arg ) {
5554 vFAIL3("Verb pattern '%.*s' may not have an argument",
5555 verb_len, start_verb);
5557 ret = reg_node(pRExC_state, op);
5559 nextchar(pRExC_state);
5562 if (*RExC_parse == '?') { /* (?...) */
5563 bool is_logical = 0;
5564 const char * const seqstart = RExC_parse;
5567 paren = *RExC_parse++;
5568 ret = NULL; /* For look-ahead/behind. */
5571 case 'P': /* (?P...) variants for those used to PCRE/Python */
5572 paren = *RExC_parse++;
5573 if ( paren == '<') /* (?P<...>) named capture */
5575 else if (paren == '>') { /* (?P>name) named recursion */
5576 goto named_recursion;
5578 else if (paren == '=') { /* (?P=...) named backref */
5579 /* this pretty much dupes the code for \k<NAME> in regatom(), if
5580 you change this make sure you change that */
5581 char* name_start = RExC_parse;
5583 SV *sv_dat = reg_scan_name(pRExC_state,
5584 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5585 if (RExC_parse == name_start || *RExC_parse != ')')
5586 vFAIL2("Sequence %.3s... not terminated",parse_start);
5589 num = add_data( pRExC_state, 1, "S" );
5590 RExC_rxi->data->data[num]=(void*)sv_dat;
5591 SvREFCNT_inc_simple_void(sv_dat);
5594 ret = reganode(pRExC_state,
5595 (U8)(FOLD ? (LOC ? NREFFL : NREFF) : NREF),
5599 Set_Node_Offset(ret, parse_start+1);
5600 Set_Node_Cur_Length(ret); /* MJD */
5602 nextchar(pRExC_state);
5606 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5608 case '<': /* (?<...) */
5609 if (*RExC_parse == '!')
5611 else if (*RExC_parse != '=')
5617 case '\'': /* (?'...') */
5618 name_start= RExC_parse;
5619 svname = reg_scan_name(pRExC_state,
5620 SIZE_ONLY ? /* reverse test from the others */
5621 REG_RSN_RETURN_NAME :
5622 REG_RSN_RETURN_NULL);
5623 if (RExC_parse == name_start) {
5625 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5628 if (*RExC_parse != paren)
5629 vFAIL2("Sequence (?%c... not terminated",
5630 paren=='>' ? '<' : paren);
5634 if (!svname) /* shouldnt happen */
5636 "panic: reg_scan_name returned NULL");
5637 if (!RExC_paren_names) {
5638 RExC_paren_names= newHV();
5639 sv_2mortal((SV*)RExC_paren_names);
5641 RExC_paren_name_list= newAV();
5642 sv_2mortal((SV*)RExC_paren_name_list);
5645 he_str = hv_fetch_ent( RExC_paren_names, svname, 1, 0 );
5647 sv_dat = HeVAL(he_str);
5649 /* croak baby croak */
5651 "panic: paren_name hash element allocation failed");
5652 } else if ( SvPOK(sv_dat) ) {
5653 /* (?|...) can mean we have dupes so scan to check
5654 its already been stored. Maybe a flag indicating
5655 we are inside such a construct would be useful,
5656 but the arrays are likely to be quite small, so
5657 for now we punt -- dmq */
5658 IV count = SvIV(sv_dat);
5659 I32 *pv = (I32*)SvPVX(sv_dat);
5661 for ( i = 0 ; i < count ; i++ ) {
5662 if ( pv[i] == RExC_npar ) {
5668 pv = (I32*)SvGROW(sv_dat, SvCUR(sv_dat) + sizeof(I32)+1);
5669 SvCUR_set(sv_dat, SvCUR(sv_dat) + sizeof(I32));
5670 pv[count] = RExC_npar;
5674 (void)SvUPGRADE(sv_dat,SVt_PVNV);
5675 sv_setpvn(sv_dat, (char *)&(RExC_npar), sizeof(I32));
5680 if (!av_store(RExC_paren_name_list, RExC_npar, SvREFCNT_inc(svname)))
5681 SvREFCNT_dec(svname);
5684 /*sv_dump(sv_dat);*/
5686 nextchar(pRExC_state);
5688 goto capturing_parens;
5690 RExC_seen |= REG_SEEN_LOOKBEHIND;
5692 case '=': /* (?=...) */
5693 case '!': /* (?!...) */
5694 RExC_seen_zerolen++;
5695 if (*RExC_parse == ')') {
5696 ret=reg_node(pRExC_state, OPFAIL);
5697 nextchar(pRExC_state);
5701 case '|': /* (?|...) */
5702 /* branch reset, behave like a (?:...) except that
5703 buffers in alternations share the same numbers */
5705 after_freeze = freeze_paren = RExC_npar;
5707 case ':': /* (?:...) */
5708 case '>': /* (?>...) */
5710 case '$': /* (?$...) */
5711 case '@': /* (?@...) */
5712 vFAIL2("Sequence (?%c...) not implemented", (int)paren);
5714 case '#': /* (?#...) */
5715 while (*RExC_parse && *RExC_parse != ')')
5717 if (*RExC_parse != ')')
5718 FAIL("Sequence (?#... not terminated");
5719 nextchar(pRExC_state);
5722 case '0' : /* (?0) */
5723 case 'R' : /* (?R) */
5724 if (*RExC_parse != ')')
5725 FAIL("Sequence (?R) not terminated");
5726 ret = reg_node(pRExC_state, GOSTART);
5727 *flagp |= POSTPONED;
5728 nextchar(pRExC_state);
5731 { /* named and numeric backreferences */
5733 case '&': /* (?&NAME) */
5734 parse_start = RExC_parse - 1;
5737 SV *sv_dat = reg_scan_name(pRExC_state,
5738 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5739 num = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
5741 goto gen_recurse_regop;
5744 if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
5746 vFAIL("Illegal pattern");
5748 goto parse_recursion;
5750 case '-': /* (?-1) */
5751 if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
5752 RExC_parse--; /* rewind to let it be handled later */
5756 case '1': case '2': case '3': case '4': /* (?1) */
5757 case '5': case '6': case '7': case '8': case '9':
5760 num = atoi(RExC_parse);
5761 parse_start = RExC_parse - 1; /* MJD */
5762 if (*RExC_parse == '-')
5764 while (isDIGIT(*RExC_parse))
5766 if (*RExC_parse!=')')
5767 vFAIL("Expecting close bracket");
5770 if ( paren == '-' ) {
5772 Diagram of capture buffer numbering.
5773 Top line is the normal capture buffer numbers
5774 Botton line is the negative indexing as from
5778 /(a(x)y)(a(b(c(?-2)d)e)f)(g(h))/
5782 num = RExC_npar + num;
5785 vFAIL("Reference to nonexistent group");
5787 } else if ( paren == '+' ) {
5788 num = RExC_npar + num - 1;
5791 ret = reganode(pRExC_state, GOSUB, num);
5793 if (num > (I32)RExC_rx->nparens) {
5795 vFAIL("Reference to nonexistent group");
5797 ARG2L_SET( ret, RExC_recurse_count++);
5799 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
5800 "Recurse #%"UVuf" to %"IVdf"\n", (UV)ARG(ret), (IV)ARG2L(ret)));
5804 RExC_seen |= REG_SEEN_RECURSE;
5805 Set_Node_Length(ret, 1 + regarglen[OP(ret)]); /* MJD */
5806 Set_Node_Offset(ret, parse_start); /* MJD */
5808 *flagp |= POSTPONED;
5809 nextchar(pRExC_state);
5811 } /* named and numeric backreferences */
5814 case '?': /* (??...) */
5816 if (*RExC_parse != '{') {
5818 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5821 *flagp |= POSTPONED;
5822 paren = *RExC_parse++;
5824 case '{': /* (?{...}) */
5829 char *s = RExC_parse;
5831 RExC_seen_zerolen++;
5832 RExC_seen |= REG_SEEN_EVAL;
5833 while (count && (c = *RExC_parse)) {
5844 if (*RExC_parse != ')') {
5846 vFAIL("Sequence (?{...}) not terminated or not {}-balanced");
5850 OP_4tree *sop, *rop;
5851 SV * const sv = newSVpvn(s, RExC_parse - 1 - s);
5854 Perl_save_re_context(aTHX);
5855 rop = sv_compile_2op(sv, &sop, "re", &pad);
5856 sop->op_private |= OPpREFCOUNTED;
5857 /* re_dup will OpREFCNT_inc */
5858 OpREFCNT_set(sop, 1);
5861 n = add_data(pRExC_state, 3, "nop");
5862 RExC_rxi->data->data[n] = (void*)rop;
5863 RExC_rxi->data->data[n+1] = (void*)sop;
5864 RExC_rxi->data->data[n+2] = (void*)pad;
5867 else { /* First pass */
5868 if (PL_reginterp_cnt < ++RExC_seen_evals
5870 /* No compiled RE interpolated, has runtime
5871 components ===> unsafe. */
5872 FAIL("Eval-group not allowed at runtime, use re 'eval'");
5873 if (PL_tainting && PL_tainted)
5874 FAIL("Eval-group in insecure regular expression");
5875 #if PERL_VERSION > 8
5876 if (IN_PERL_COMPILETIME)
5881 nextchar(pRExC_state);
5883 ret = reg_node(pRExC_state, LOGICAL);
5886 REGTAIL(pRExC_state, ret, reganode(pRExC_state, EVAL, n));
5887 /* deal with the length of this later - MJD */
5890 ret = reganode(pRExC_state, EVAL, n);
5891 Set_Node_Length(ret, RExC_parse - parse_start + 1);
5892 Set_Node_Offset(ret, parse_start);
5895 case '(': /* (?(?{...})...) and (?(?=...)...) */
5898 if (RExC_parse[0] == '?') { /* (?(?...)) */
5899 if (RExC_parse[1] == '=' || RExC_parse[1] == '!'
5900 || RExC_parse[1] == '<'
5901 || RExC_parse[1] == '{') { /* Lookahead or eval. */
5904 ret = reg_node(pRExC_state, LOGICAL);
5907 REGTAIL(pRExC_state, ret, reg(pRExC_state, 1, &flag,depth+1));
5911 else if ( RExC_parse[0] == '<' /* (?(<NAME>)...) */
5912 || RExC_parse[0] == '\'' ) /* (?('NAME')...) */
5914 char ch = RExC_parse[0] == '<' ? '>' : '\'';
5915 char *name_start= RExC_parse++;
5917 SV *sv_dat=reg_scan_name(pRExC_state,
5918 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5919 if (RExC_parse == name_start || *RExC_parse != ch)
5920 vFAIL2("Sequence (?(%c... not terminated",
5921 (ch == '>' ? '<' : ch));
5924 num = add_data( pRExC_state, 1, "S" );
5925 RExC_rxi->data->data[num]=(void*)sv_dat;
5926 SvREFCNT_inc_simple_void(sv_dat);
5928 ret = reganode(pRExC_state,NGROUPP,num);
5929 goto insert_if_check_paren;
5931 else if (RExC_parse[0] == 'D' &&
5932 RExC_parse[1] == 'E' &&
5933 RExC_parse[2] == 'F' &&
5934 RExC_parse[3] == 'I' &&
5935 RExC_parse[4] == 'N' &&
5936 RExC_parse[5] == 'E')
5938 ret = reganode(pRExC_state,DEFINEP,0);
5941 goto insert_if_check_paren;
5943 else if (RExC_parse[0] == 'R') {
5946 if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
5947 parno = atoi(RExC_parse++);
5948 while (isDIGIT(*RExC_parse))
5950 } else if (RExC_parse[0] == '&') {
5953 sv_dat = reg_scan_name(pRExC_state,
5954 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5955 parno = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
5957 ret = reganode(pRExC_state,INSUBP,parno);
5958 goto insert_if_check_paren;
5960 else if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
5963 parno = atoi(RExC_parse++);
5965 while (isDIGIT(*RExC_parse))
5967 ret = reganode(pRExC_state, GROUPP, parno);
5969 insert_if_check_paren:
5970 if ((c = *nextchar(pRExC_state)) != ')')
5971 vFAIL("Switch condition not recognized");
5973 REGTAIL(pRExC_state, ret, reganode(pRExC_state, IFTHEN, 0));
5974 br = regbranch(pRExC_state, &flags, 1,depth+1);
5976 br = reganode(pRExC_state, LONGJMP, 0);
5978 REGTAIL(pRExC_state, br, reganode(pRExC_state, LONGJMP, 0));
5979 c = *nextchar(pRExC_state);
5984 vFAIL("(?(DEFINE)....) does not allow branches");
5985 lastbr = reganode(pRExC_state, IFTHEN, 0); /* Fake one for optimizer. */
5986 regbranch(pRExC_state, &flags, 1,depth+1);
5987 REGTAIL(pRExC_state, ret, lastbr);
5990 c = *nextchar(pRExC_state);
5995 vFAIL("Switch (?(condition)... contains too many branches");
5996 ender = reg_node(pRExC_state, TAIL);
5997 REGTAIL(pRExC_state, br, ender);
5999 REGTAIL(pRExC_state, lastbr, ender);
6000 REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender);
6003 REGTAIL(pRExC_state, ret, ender);
6004 RExC_size++; /* XXX WHY do we need this?!!
6005 For large programs it seems to be required
6006 but I can't figure out why. -- dmq*/
6010 vFAIL2("Unknown switch condition (?(%.2s", RExC_parse);
6014 RExC_parse--; /* for vFAIL to print correctly */
6015 vFAIL("Sequence (? incomplete");
6019 parse_flags: /* (?i) */
6021 U32 posflags = 0, negflags = 0;
6022 U32 *flagsp = &posflags;
6024 while (*RExC_parse) {
6025 /* && strchr("iogcmsx", *RExC_parse) */
6026 /* (?g), (?gc) and (?o) are useless here
6027 and must be globally applied -- japhy */
6028 switch (*RExC_parse) {
6029 CASE_STD_PMMOD_FLAGS_PARSE_SET(flagsp);
6030 case ONCE_PAT_MOD: /* 'o' */
6031 case GLOBAL_PAT_MOD: /* 'g' */
6032 if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6033 const I32 wflagbit = *RExC_parse == 'o' ? WASTED_O : WASTED_G;
6034 if (! (wastedflags & wflagbit) ) {
6035 wastedflags |= wflagbit;
6038 "Useless (%s%c) - %suse /%c modifier",
6039 flagsp == &negflags ? "?-" : "?",
6041 flagsp == &negflags ? "don't " : "",
6048 case CONTINUE_PAT_MOD: /* 'c' */
6049 if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6050 if (! (wastedflags & WASTED_C) ) {
6051 wastedflags |= WASTED_GC;
6054 "Useless (%sc) - %suse /gc modifier",
6055 flagsp == &negflags ? "?-" : "?",
6056 flagsp == &negflags ? "don't " : ""
6061 case KEEPCOPY_PAT_MOD: /* 'p' */
6062 if (flagsp == &negflags) {
6063 if (SIZE_ONLY && ckWARN(WARN_REGEXP))
6064 vWARN(RExC_parse + 1,"Useless use of (?-p)");
6066 *flagsp |= RXf_PMf_KEEPCOPY;
6070 if (flagsp == &negflags) {
6072 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
6076 wastedflags = 0; /* reset so (?g-c) warns twice */
6082 RExC_flags |= posflags;
6083 RExC_flags &= ~negflags;
6085 oregflags |= posflags;
6086 oregflags &= ~negflags;
6088 nextchar(pRExC_state);
6099 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
6104 }} /* one for the default block, one for the switch */
6111 ret = reganode(pRExC_state, OPEN, parno);
6114 RExC_nestroot = parno;
6115 if (RExC_seen & REG_SEEN_RECURSE
6116 && !RExC_open_parens[parno-1])
6118 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
6119 "Setting open paren #%"IVdf" to %d\n",
6120 (IV)parno, REG_NODE_NUM(ret)));
6121 RExC_open_parens[parno-1]= ret;
6124 Set_Node_Length(ret, 1); /* MJD */
6125 Set_Node_Offset(ret, RExC_parse); /* MJD */
6133 /* Pick up the branches, linking them together. */
6134 parse_start = RExC_parse; /* MJD */
6135 br = regbranch(pRExC_state, &flags, 1,depth+1);
6136 /* branch_len = (paren != 0); */
6140 if (*RExC_parse == '|') {
6141 if (!SIZE_ONLY && RExC_extralen) {
6142 reginsert(pRExC_state, BRANCHJ, br, depth+1);
6145 reginsert(pRExC_state, BRANCH, br, depth+1);
6146 Set_Node_Length(br, paren != 0);
6147 Set_Node_Offset_To_R(br-RExC_emit_start, parse_start-RExC_start);
6151 RExC_extralen += 1; /* For BRANCHJ-BRANCH. */
6153 else if (paren == ':') {
6154 *flagp |= flags&SIMPLE;
6156 if (is_open) { /* Starts with OPEN. */
6157 REGTAIL(pRExC_state, ret, br); /* OPEN -> first. */
6159 else if (paren != '?') /* Not Conditional */
6161 *flagp |= flags & (SPSTART | HASWIDTH | POSTPONED);
6163 while (*RExC_parse == '|') {
6164 if (!SIZE_ONLY && RExC_extralen) {
6165 ender = reganode(pRExC_state, LONGJMP,0);
6166 REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender); /* Append to the previous. */
6169 RExC_extralen += 2; /* Account for LONGJMP. */
6170 nextchar(pRExC_state);
6172 if (RExC_npar > after_freeze)
6173 after_freeze = RExC_npar;
6174 RExC_npar = freeze_paren;
6176 br = regbranch(pRExC_state, &flags, 0, depth+1);
6180 REGTAIL(pRExC_state, lastbr, br); /* BRANCH -> BRANCH. */
6182 *flagp |= flags & (SPSTART | HASWIDTH | POSTPONED);
6185 if (have_branch || paren != ':') {
6186 /* Make a closing node, and hook it on the end. */
6189 ender = reg_node(pRExC_state, TAIL);
6192 ender = reganode(pRExC_state, CLOSE, parno);
6193 if (!SIZE_ONLY && RExC_seen & REG_SEEN_RECURSE) {
6194 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
6195 "Setting close paren #%"IVdf" to %d\n",
6196 (IV)parno, REG_NODE_NUM(ender)));
6197 RExC_close_parens[parno-1]= ender;
6198 if (RExC_nestroot == parno)
6201 Set_Node_Offset(ender,RExC_parse+1); /* MJD */
6202 Set_Node_Length(ender,1); /* MJD */
6208 *flagp &= ~HASWIDTH;
6211 ender = reg_node(pRExC_state, SUCCEED);
6214 ender = reg_node(pRExC_state, END);
6216 assert(!RExC_opend); /* there can only be one! */
6221 REGTAIL(pRExC_state, lastbr, ender);
6223 if (have_branch && !SIZE_ONLY) {
6225 RExC_seen |= REG_TOP_LEVEL_BRANCHES;
6227 /* Hook the tails of the branches to the closing node. */
6228 for (br = ret; br; br = regnext(br)) {
6229 const U8 op = PL_regkind[OP(br)];
6231 REGTAIL_STUDY(pRExC_state, NEXTOPER(br), ender);
6233 else if (op == BRANCHJ) {
6234 REGTAIL_STUDY(pRExC_state, NEXTOPER(NEXTOPER(br)), ender);
6242 static const char parens[] = "=!<,>";
6244 if (paren && (p = strchr(parens, paren))) {
6245 U8 node = ((p - parens) % 2) ? UNLESSM : IFMATCH;
6246 int flag = (p - parens) > 1;
6249 node = SUSPEND, flag = 0;
6250 reginsert(pRExC_state, node,ret, depth+1);
6251 Set_Node_Cur_Length(ret);
6252 Set_Node_Offset(ret, parse_start + 1);
6254 REGTAIL_STUDY(pRExC_state, ret, reg_node(pRExC_state, TAIL));
6258 /* Check for proper termination. */
6260 RExC_flags = oregflags;
6261 if (RExC_parse >= RExC_end || *nextchar(pRExC_state) != ')') {
6262 RExC_parse = oregcomp_parse;
6263 vFAIL("Unmatched (");
6266 else if (!paren && RExC_parse < RExC_end) {
6267 if (*RExC_parse == ')') {
6269 vFAIL("Unmatched )");
6272 FAIL("Junk on end of regexp"); /* "Can't happen". */
6276 RExC_npar = after_freeze;
6281 - regbranch - one alternative of an | operator
6283 * Implements the concatenation operator.
6286 S_regbranch(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, I32 first, U32 depth)
6289 register regnode *ret;
6290 register regnode *chain = NULL;
6291 register regnode *latest;
6292 I32 flags = 0, c = 0;
6293 GET_RE_DEBUG_FLAGS_DECL;
6295 PERL_ARGS_ASSERT_REGBRANCH;
6297 DEBUG_PARSE("brnc");
6302 if (!SIZE_ONLY && RExC_extralen)
6303 ret = reganode(pRExC_state, BRANCHJ,0);
6305 ret = reg_node(pRExC_state, BRANCH);
6306 Set_Node_Length(ret, 1);
6310 if (!first && SIZE_ONLY)
6311 RExC_extralen += 1; /* BRANCHJ */
6313 *flagp = WORST; /* Tentatively. */
6316 nextchar(pRExC_state);
6317 while (RExC_parse < RExC_end && *RExC_parse != '|' && *RExC_parse != ')') {
6319 latest = regpiece(pRExC_state, &flags,depth+1);
6320 if (latest == NULL) {
6321 if (flags & TRYAGAIN)
6325 else if (ret == NULL)
6327 *flagp |= flags&(HASWIDTH|POSTPONED);
6328 if (chain == NULL) /* First piece. */
6329 *flagp |= flags&SPSTART;
6332 REGTAIL(pRExC_state, chain, latest);
6337 if (chain == NULL) { /* Loop ran zero times. */
6338 chain = reg_node(pRExC_state, NOTHING);
6343 *flagp |= flags&SIMPLE;
6350 - regpiece - something followed by possible [*+?]
6352 * Note that the branching code sequences used for ? and the general cases
6353 * of * and + are somewhat optimized: they use the same NOTHING node as
6354 * both the endmarker for their branch list and the body of the last branch.
6355 * It might seem that this node could be dispensed with entirely, but the
6356 * endmarker role is not redundant.
6359 S_regpiece(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
6362 register regnode *ret;
6364 register char *next;
6366 const char * const origparse = RExC_parse;
6368 I32 max = REG_INFTY;
6370 const char *maxpos = NULL;
6371 GET_RE_DEBUG_FLAGS_DECL;
6373 PERL_ARGS_ASSERT_REGPIECE;
6375 DEBUG_PARSE("piec");
6377 ret = regatom(pRExC_state, &flags,depth+1);
6379 if (flags & TRYAGAIN)
6386 if (op == '{' && regcurly(RExC_parse)) {
6388 parse_start = RExC_parse; /* MJD */
6389 next = RExC_parse + 1;
6390 while (isDIGIT(*next) || *next == ',') {
6399 if (*next == '}') { /* got one */
6403 min = atoi(RExC_parse);
6407 maxpos = RExC_parse;
6409 if (!max && *maxpos != '0')
6410 max = REG_INFTY; /* meaning "infinity" */
6411 else if (max >= REG_INFTY)
6412 vFAIL2("Quantifier in {,} bigger than %d", REG_INFTY - 1);
6414 nextchar(pRExC_state);
6417 if ((flags&SIMPLE)) {
6418 RExC_naughty += 2 + RExC_naughty / 2;
6419 reginsert(pRExC_state, CURLY, ret, depth+1);
6420 Set_Node_Offset(ret, parse_start+1); /* MJD */
6421 Set_Node_Cur_Length(ret);
6424 regnode * const w = reg_node(pRExC_state, WHILEM);
6427 REGTAIL(pRExC_state, ret, w);
6428 if (!SIZE_ONLY && RExC_extralen) {
6429 reginsert(pRExC_state, LONGJMP,ret, depth+1);
6430 reginsert(pRExC_state, NOTHING,ret, depth+1);
6431 NEXT_OFF(ret) = 3; /* Go over LONGJMP. */
6433 reginsert(pRExC_state, CURLYX,ret, depth+1);
6435 Set_Node_Offset(ret, parse_start+1);
6436 Set_Node_Length(ret,
6437 op == '{' ? (RExC_parse - parse_start) : 1);
6439 if (!SIZE_ONLY && RExC_extralen)
6440 NEXT_OFF(ret) = 3; /* Go over NOTHING to LONGJMP. */
6441 REGTAIL(pRExC_state, ret, reg_node(pRExC_state, NOTHING));
6443 RExC_whilem_seen++, RExC_extralen += 3;
6444 RExC_naughty += 4 + RExC_naughty; /* compound interest */
6452 if (max && max < min)
6453 vFAIL("Can't do {n,m} with n > m");
6455 ARG1_SET(ret, (U16)min);
6456 ARG2_SET(ret, (U16)max);
6468 #if 0 /* Now runtime fix should be reliable. */
6470 /* if this is reinstated, don't forget to put this back into perldiag:
6472 =item Regexp *+ operand could be empty at {#} in regex m/%s/
6474 (F) The part of the regexp subject to either the * or + quantifier
6475 could match an empty string. The {#} shows in the regular
6476 expression about where the problem was discovered.
6480 if (!(flags&HASWIDTH) && op != '?')
6481 vFAIL("Regexp *+ operand could be empty");
6484 parse_start = RExC_parse;
6485 nextchar(pRExC_state);
6487 *flagp = (op != '+') ? (WORST|SPSTART|HASWIDTH) : (WORST|HASWIDTH);
6489 if (op == '*' && (flags&SIMPLE)) {
6490 reginsert(pRExC_state, STAR, ret, depth+1);
6494 else if (op == '*') {
6498 else if (op == '+' && (flags&SIMPLE)) {
6499 reginsert(pRExC_state, PLUS, ret, depth+1);
6503 else if (op == '+') {
6507 else if (op == '?') {
6512 if (!SIZE_ONLY && !(flags&(HASWIDTH|POSTPONED)) && max > REG_INFTY/3 && ckWARN(WARN_REGEXP)) {
6514 "%.*s matches null string many times",
6515 (int)(RExC_parse >= origparse ? RExC_parse - origparse : 0),
6519 if (RExC_parse < RExC_end && *RExC_parse == '?') {
6520 nextchar(pRExC_state);
6521 reginsert(pRExC_state, MINMOD, ret, depth+1);
6522 REGTAIL(pRExC_state, ret, ret + NODE_STEP_REGNODE);
6524 #ifndef REG_ALLOW_MINMOD_SUSPEND
6527 if (RExC_parse < RExC_end && *RExC_parse == '+') {
6529 nextchar(pRExC_state);
6530 ender = reg_node(pRExC_state, SUCCEED);
6531 REGTAIL(pRExC_state, ret, ender);
6532 reginsert(pRExC_state, SUSPEND, ret, depth+1);
6534 ender = reg_node(pRExC_state, TAIL);
6535 REGTAIL(pRExC_state, ret, ender);
6539 if (RExC_parse < RExC_end && ISMULT2(RExC_parse)) {
6541 vFAIL("Nested quantifiers");
6548 /* reg_namedseq(pRExC_state,UVp)
6550 This is expected to be called by a parser routine that has
6551 recognized'\N' and needs to handle the rest. RExC_parse is
6552 expected to point at the first char following the N at the time
6555 If valuep is non-null then it is assumed that we are parsing inside
6556 of a charclass definition and the first codepoint in the resolved
6557 string is returned via *valuep and the routine will return NULL.
6558 In this mode if a multichar string is returned from the charnames
6559 handler a warning will be issued, and only the first char in the
6560 sequence will be examined. If the string returned is zero length
6561 then the value of *valuep is undefined and NON-NULL will
6562 be returned to indicate failure. (This will NOT be a valid pointer
6565 If value is null then it is assumed that we are parsing normal text
6566 and inserts a new EXACT node into the program containing the resolved
6567 string and returns a pointer to the new node. If the string is
6568 zerolength a NOTHING node is emitted.
6570 On success RExC_parse is set to the char following the endbrace.
6571 Parsing failures will generate a fatal errorvia vFAIL(...)
6573 NOTE: We cache all results from the charnames handler locally in
6574 the RExC_charnames hash (created on first use) to prevent a charnames
6575 handler from playing silly-buggers and returning a short string and
6576 then a long string for a given pattern. Since the regexp program
6577 size is calculated during an initial parse this would result
6578 in a buffer overrun so we cache to prevent the charname result from
6579 changing during the course of the parse.
6583 S_reg_namedseq(pTHX_ RExC_state_t *pRExC_state, UV *valuep)
6585 char * name; /* start of the content of the name */
6586 char * endbrace; /* endbrace following the name */
6589 STRLEN len; /* this has various purposes throughout the code */
6590 bool cached = 0; /* if this is true then we shouldn't refcount dev sv_str */
6591 regnode *ret = NULL;
6593 PERL_ARGS_ASSERT_REG_NAMEDSEQ;
6595 if (*RExC_parse != '{') {
6596 vFAIL("Missing braces on \\N{}");
6598 name = RExC_parse+1;
6599 endbrace = strchr(RExC_parse, '}');
6602 vFAIL("Missing right brace on \\N{}");
6604 RExC_parse = endbrace + 1;
6607 /* RExC_parse points at the beginning brace,
6608 endbrace points at the last */
6609 if ( name[0]=='U' && name[1]=='+' ) {
6610 /* its a "Unicode hex" notation {U+89AB} */
6611 I32 fl = PERL_SCAN_ALLOW_UNDERSCORES
6612 | PERL_SCAN_DISALLOW_PREFIX
6613 | (SIZE_ONLY ? PERL_SCAN_SILENT_ILLDIGIT : 0);
6616 len = (STRLEN)(endbrace - name - 2);
6617 cp = grok_hex(name + 2, &len, &fl, NULL);
6618 if ( len != (STRLEN)(endbrace - name - 2) ) {
6628 sv_str= newSVpvn(&string, 1);
6630 /* fetch the charnames handler for this scope */
6631 HV * const table = GvHV(PL_hintgv);
6633 hv_fetchs(table, "charnames", FALSE) :
6635 SV *cv= cvp ? *cvp : NULL;
6638 /* create an SV with the name as argument */
6639 sv_name = newSVpvn(name, endbrace - name);
6641 if (!table || !(PL_hints & HINT_LOCALIZE_HH)) {
6642 vFAIL2("Constant(\\N{%s}) unknown: "
6643 "(possibly a missing \"use charnames ...\")",
6646 if (!cvp || !SvOK(*cvp)) { /* when $^H{charnames} = undef; */
6647 vFAIL2("Constant(\\N{%s}): "
6648 "$^H{charnames} is not defined",SvPVX(sv_name));
6653 if (!RExC_charnames) {
6654 /* make sure our cache is allocated */
6655 RExC_charnames = newHV();
6656 sv_2mortal((SV*)RExC_charnames);
6658 /* see if we have looked this one up before */
6659 he_str = hv_fetch_ent( RExC_charnames, sv_name, 0, 0 );
6661 sv_str = HeVAL(he_str);
6674 count= call_sv(cv, G_SCALAR);
6676 if (count == 1) { /* XXXX is this right? dmq */
6678 SvREFCNT_inc_simple_void(sv_str);
6686 if ( !sv_str || !SvOK(sv_str) ) {
6687 vFAIL2("Constant(\\N{%s}): Call to &{$^H{charnames}} "
6688 "did not return a defined value",SvPVX(sv_name));
6690 if (hv_store_ent( RExC_charnames, sv_name, sv_str, 0))
6695 char *p = SvPV(sv_str, len);
6698 if ( SvUTF8(sv_str) ) {
6699 *valuep = utf8_to_uvchr((U8*)p, &numlen);
6703 We have to turn on utf8 for high bit chars otherwise
6704 we get failures with
6706 "ss" =~ /[\N{LATIN SMALL LETTER SHARP S}]/i
6707 "SS" =~ /[\N{LATIN SMALL LETTER SHARP S}]/i
6709 This is different from what \x{} would do with the same
6710 codepoint, where the condition is > 0xFF.
6717 /* warn if we havent used the whole string? */
6719 if (numlen<len && SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6721 "Ignoring excess chars from \\N{%s} in character class",
6725 } else if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6727 "Ignoring zero length \\N{%s} in character class",
6732 SvREFCNT_dec(sv_name);
6734 SvREFCNT_dec(sv_str);
6735 return len ? NULL : (regnode *)&len;
6736 } else if(SvCUR(sv_str)) {
6742 char * parse_start = name-3; /* needed for the offsets */
6744 GET_RE_DEBUG_FLAGS_DECL; /* needed for the offsets */
6746 ret = reg_node(pRExC_state,
6747 (U8)(FOLD ? (LOC ? EXACTFL : EXACTF) : EXACT));
6750 if ( RExC_utf8 && !SvUTF8(sv_str) ) {
6751 sv_utf8_upgrade(sv_str);
6752 } else if ( !RExC_utf8 && SvUTF8(sv_str) ) {
6756 p = SvPV(sv_str, len);
6758 /* len is the length written, charlen is the size the char read */
6759 for ( len = 0; p < pend; p += charlen ) {
6761 UV uvc = utf8_to_uvchr((U8*)p, &charlen);
6763 STRLEN foldlen,numlen;
6764 U8 tmpbuf[UTF8_MAXBYTES_CASE+1], *foldbuf;
6765 uvc = toFOLD_uni(uvc, tmpbuf, &foldlen);
6766 /* Emit all the Unicode characters. */
6768 for (foldbuf = tmpbuf;
6772 uvc = utf8_to_uvchr(foldbuf, &numlen);
6774 const STRLEN unilen = reguni(pRExC_state, uvc, s);
6777 /* In EBCDIC the numlen
6778 * and unilen can differ. */
6780 if (numlen >= foldlen)
6784 break; /* "Can't happen." */
6787 const STRLEN unilen = reguni(pRExC_state, uvc, s);
6799 RExC_size += STR_SZ(len);
6802 RExC_emit += STR_SZ(len);
6804 Set_Node_Cur_Length(ret); /* MJD */
6806 nextchar(pRExC_state);
6808 ret = reg_node(pRExC_state,NOTHING);
6811 SvREFCNT_dec(sv_str);
6814 SvREFCNT_dec(sv_name);
6824 * It returns the code point in utf8 for the value in *encp.
6825 * value: a code value in the source encoding
6826 * encp: a pointer to an Encode object
6828 * If the result from Encode is not a single character,
6829 * it returns U+FFFD (Replacement character) and sets *encp to NULL.
6832 S_reg_recode(pTHX_ const char value, SV **encp)
6835 SV * const sv = newSVpvn_flags(&value, numlen, SVs_TEMP);
6836 const char * const s = *encp ? sv_recode_to_utf8(sv, *encp) : SvPVX(sv);
6837 const STRLEN newlen = SvCUR(sv);
6838 UV uv = UNICODE_REPLACEMENT;
6840 PERL_ARGS_ASSERT_REG_RECODE;
6844 ? utf8n_to_uvchr((U8*)s, newlen, &numlen, UTF8_ALLOW_DEFAULT)
6847 if (!newlen || numlen != newlen) {
6848 uv = UNICODE_REPLACEMENT;
6856 - regatom - the lowest level
6858 Try to identify anything special at the start of the pattern. If there
6859 is, then handle it as required. This may involve generating a single regop,
6860 such as for an assertion; or it may involve recursing, such as to
6861 handle a () structure.
6863 If the string doesn't start with something special then we gobble up
6864 as much literal text as we can.
6866 Once we have been able to handle whatever type of thing started the
6867 sequence, we return.
6869 Note: we have to be careful with escapes, as they can be both literal
6870 and special, and in the case of \10 and friends can either, depending
6871 on context. Specifically there are two seperate switches for handling
6872 escape sequences, with the one for handling literal escapes requiring
6873 a dummy entry for all of the special escapes that are actually handled
6878 S_regatom(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
6881 register regnode *ret = NULL;
6883 char *parse_start = RExC_parse;
6884 GET_RE_DEBUG_FLAGS_DECL;
6885 DEBUG_PARSE("atom");
6886 *flagp = WORST; /* Tentatively. */
6888 PERL_ARGS_ASSERT_REGATOM;
6891 switch ((U8)*RExC_parse) {
6893 RExC_seen_zerolen++;
6894 nextchar(pRExC_state);
6895 if (RExC_flags & RXf_PMf_MULTILINE)
6896 ret = reg_node(pRExC_state, MBOL);
6897 else if (RExC_flags & RXf_PMf_SINGLELINE)
6898 ret = reg_node(pRExC_state, SBOL);
6900 ret = reg_node(pRExC_state, BOL);
6901 Set_Node_Length(ret, 1); /* MJD */
6904 nextchar(pRExC_state);
6906 RExC_seen_zerolen++;
6907 if (RExC_flags & RXf_PMf_MULTILINE)
6908 ret = reg_node(pRExC_state, MEOL);
6909 else if (RExC_flags & RXf_PMf_SINGLELINE)
6910 ret = reg_node(pRExC_state, SEOL);
6912 ret = reg_node(pRExC_state, EOL);
6913 Set_Node_Length(ret, 1); /* MJD */
6916 nextchar(pRExC_state);
6917 if (RExC_flags & RXf_PMf_SINGLELINE)
6918 ret = reg_node(pRExC_state, SANY);
6920 ret = reg_node(pRExC_state, REG_ANY);
6921 *flagp |= HASWIDTH|SIMPLE;
6923 Set_Node_Length(ret, 1); /* MJD */
6927 char * const oregcomp_parse = ++RExC_parse;
6928 ret = regclass(pRExC_state,depth+1);
6929 if (*RExC_parse != ']') {
6930 RExC_parse = oregcomp_parse;
6931 vFAIL("Unmatched [");
6933 nextchar(pRExC_state);
6934 *flagp |= HASWIDTH|SIMPLE;
6935 Set_Node_Length(ret, RExC_parse - oregcomp_parse + 1); /* MJD */
6939 nextchar(pRExC_state);
6940 ret = reg(pRExC_state, 1, &flags,depth+1);
6942 if (flags & TRYAGAIN) {
6943 if (RExC_parse == RExC_end) {
6944 /* Make parent create an empty node if needed. */
6952 *flagp |= flags&(HASWIDTH|SPSTART|SIMPLE|POSTPONED);
6956 if (flags & TRYAGAIN) {
6960 vFAIL("Internal urp");
6961 /* Supposed to be caught earlier. */
6964 if (!regcurly(RExC_parse)) {
6973 vFAIL("Quantifier follows nothing");
6981 len=0; /* silence a spurious compiler warning */
6982 if ((cp = what_len_TRICKYFOLD_safe(RExC_parse,RExC_end,UTF,len))) {
6983 *flagp |= HASWIDTH; /* could be SIMPLE too, but needs a handler in regexec.regrepeat */
6984 RExC_parse+=len-1; /* we get one from nextchar() as well. :-( */
6985 ret = reganode(pRExC_state, FOLDCHAR, cp);
6986 Set_Node_Length(ret, 1); /* MJD */
6987 nextchar(pRExC_state); /* kill whitespace under /x */
6995 This switch handles escape sequences that resolve to some kind
6996 of special regop and not to literal text. Escape sequnces that
6997 resolve to literal text are handled below in the switch marked
7000 Every entry in this switch *must* have a corresponding entry
7001 in the literal escape switch. However, the opposite is not
7002 required, as the default for this switch is to jump to the
7003 literal text handling code.
7005 switch ((U8)*++RExC_parse) {
7010 /* Special Escapes */
7012 RExC_seen_zerolen++;
7013 ret = reg_node(pRExC_state, SBOL);
7015 goto finish_meta_pat;
7017 ret = reg_node(pRExC_state, GPOS);
7018 RExC_seen |= REG_SEEN_GPOS;
7020 goto finish_meta_pat;
7022 RExC_seen_zerolen++;
7023 ret = reg_node(pRExC_state, KEEPS);
7025 /* XXX:dmq : disabling in-place substitution seems to
7026 * be necessary here to avoid cases of memory corruption, as
7027 * with: C<$_="x" x 80; s/x\K/y/> -- rgs
7029 RExC_seen |= REG_SEEN_LOOKBEHIND;
7030 goto finish_meta_pat;
7032 ret = reg_node(pRExC_state, SEOL);
7034 RExC_seen_zerolen++; /* Do not optimize RE away */
7035 goto finish_meta_pat;
7037 ret = reg_node(pRExC_state, EOS);
7039 RExC_seen_zerolen++; /* Do not optimize RE away */
7040 goto finish_meta_pat;
7042 ret = reg_node(pRExC_state, CANY);
7043 RExC_seen |= REG_SEEN_CANY;
7044 *flagp |= HASWIDTH|SIMPLE;
7045 goto finish_meta_pat;
7047 ret = reg_node(pRExC_state, CLUMP);
7049 goto finish_meta_pat;
7051 ret = reg_node(pRExC_state, (U8)(LOC ? ALNUML : ALNUM));
7052 *flagp |= HASWIDTH|SIMPLE;
7053 goto finish_meta_pat;
7055 ret = reg_node(pRExC_state, (U8)(LOC ? NALNUML : NALNUM));
7056 *flagp |= HASWIDTH|SIMPLE;
7057 goto finish_meta_pat;
7059 RExC_seen_zerolen++;
7060 RExC_seen |= REG_SEEN_LOOKBEHIND;
7061 ret = reg_node(pRExC_state, (U8)(LOC ? BOUNDL : BOUND));
7063 goto finish_meta_pat;
7065 RExC_seen_zerolen++;
7066 RExC_seen |= REG_SEEN_LOOKBEHIND;
7067 ret = reg_node(pRExC_state, (U8)(LOC ? NBOUNDL : NBOUND));
7069 goto finish_meta_pat;
7071 ret = reg_node(pRExC_state, (U8)(LOC ? SPACEL : SPACE));
7072 *flagp |= HASWIDTH|SIMPLE;
7073 goto finish_meta_pat;
7075 ret = reg_node(pRExC_state, (U8)(LOC ? NSPACEL : NSPACE));
7076 *flagp |= HASWIDTH|SIMPLE;
7077 goto finish_meta_pat;
7079 ret = reg_node(pRExC_state, DIGIT);
7080 *flagp |= HASWIDTH|SIMPLE;
7081 goto finish_meta_pat;
7083 ret = reg_node(pRExC_state, NDIGIT);
7084 *flagp |= HASWIDTH|SIMPLE;
7085 goto finish_meta_pat;
7087 ret = reg_node(pRExC_state, LNBREAK);
7088 *flagp |= HASWIDTH|SIMPLE;
7089 goto finish_meta_pat;
7091 ret = reg_node(pRExC_state, HORIZWS);
7092 *flagp |= HASWIDTH|SIMPLE;
7093 goto finish_meta_pat;
7095 ret = reg_node(pRExC_state, NHORIZWS);
7096 *flagp |= HASWIDTH|SIMPLE;
7097 goto finish_meta_pat;
7099 ret = reg_node(pRExC_state, VERTWS);
7100 *flagp |= HASWIDTH|SIMPLE;
7101 goto finish_meta_pat;
7103 ret = reg_node(pRExC_state, NVERTWS);
7104 *flagp |= HASWIDTH|SIMPLE;
7106 nextchar(pRExC_state);
7107 Set_Node_Length(ret, 2); /* MJD */
7112 char* const oldregxend = RExC_end;
7114 char* parse_start = RExC_parse - 2;
7117 if (RExC_parse[1] == '{') {
7118 /* a lovely hack--pretend we saw [\pX] instead */
7119 RExC_end = strchr(RExC_parse, '}');
7121 const U8 c = (U8)*RExC_parse;
7123 RExC_end = oldregxend;
7124 vFAIL2("Missing right brace on \\%c{}", c);
7129 RExC_end = RExC_parse + 2;
7130 if (RExC_end > oldregxend)
7131 RExC_end = oldregxend;
7135 ret = regclass(pRExC_state,depth+1);
7137 RExC_end = oldregxend;
7140 Set_Node_Offset(ret, parse_start + 2);
7141 Set_Node_Cur_Length(ret);
7142 nextchar(pRExC_state);
7143 *flagp |= HASWIDTH|SIMPLE;
7147 /* Handle \N{NAME} here and not below because it can be
7148 multicharacter. join_exact() will join them up later on.
7149 Also this makes sure that things like /\N{BLAH}+/ and
7150 \N{BLAH} being multi char Just Happen. dmq*/
7152 ret= reg_namedseq(pRExC_state, NULL);
7154 case 'k': /* Handle \k<NAME> and \k'NAME' */
7157 char ch= RExC_parse[1];
7158 if (ch != '<' && ch != '\'' && ch != '{') {
7160 vFAIL2("Sequence %.2s... not terminated",parse_start);
7162 /* this pretty much dupes the code for (?P=...) in reg(), if
7163 you change this make sure you change that */
7164 char* name_start = (RExC_parse += 2);
7166 SV *sv_dat = reg_scan_name(pRExC_state,
7167 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
7168 ch= (ch == '<') ? '>' : (ch == '{') ? '}' : '\'';
7169 if (RExC_parse == name_start || *RExC_parse != ch)
7170 vFAIL2("Sequence %.3s... not terminated",parse_start);
7173 num = add_data( pRExC_state, 1, "S" );
7174 RExC_rxi->data->data[num]=(void*)sv_dat;
7175 SvREFCNT_inc_simple_void(sv_dat);
7179 ret = reganode(pRExC_state,
7180 (U8)(FOLD ? (LOC ? NREFFL : NREFF) : NREF),
7184 /* override incorrect value set in reganode MJD */
7185 Set_Node_Offset(ret, parse_start+1);
7186 Set_Node_Cur_Length(ret); /* MJD */
7187 nextchar(pRExC_state);
7193 case '1': case '2': case '3': case '4':
7194 case '5': case '6': case '7': case '8': case '9':
7197 bool isg = *RExC_parse == 'g';
7202 if (*RExC_parse == '{') {
7206 if (*RExC_parse == '-') {
7210 if (hasbrace && !isDIGIT(*RExC_parse)) {
7211 if (isrel) RExC_parse--;
7213 goto parse_named_seq;
7215 num = atoi(RExC_parse);
7216 if (isg && num == 0)
7217 vFAIL("Reference to invalid group 0");
7219 num = RExC_npar - num;
7221 vFAIL("Reference to nonexistent or unclosed group");
7223 if (!isg && num > 9 && num >= RExC_npar)
7226 char * const parse_start = RExC_parse - 1; /* MJD */
7227 while (isDIGIT(*RExC_parse))
7229 if (parse_start == RExC_parse - 1)
7230 vFAIL("Unterminated \\g... pattern");
7232 if (*RExC_parse != '}')
7233 vFAIL("Unterminated \\g{...} pattern");
7237 if (num > (I32)RExC_rx->nparens)
7238 vFAIL("Reference to nonexistent group");
7241 ret = reganode(pRExC_state,
7242 (U8)(FOLD ? (LOC ? REFFL : REFF) : REF),
7246 /* override incorrect value set in reganode MJD */
7247 Set_Node_Offset(ret, parse_start+1);
7248 Set_Node_Cur_Length(ret); /* MJD */
7250 nextchar(pRExC_state);
7255 if (RExC_parse >= RExC_end)
7256 FAIL("Trailing \\");
7259 /* Do not generate "unrecognized" warnings here, we fall
7260 back into the quick-grab loop below */
7267 if (RExC_flags & RXf_PMf_EXTENDED) {
7268 if ( reg_skipcomment( pRExC_state ) )
7275 register STRLEN len;
7280 U8 tmpbuf[UTF8_MAXBYTES_CASE+1], *foldbuf;
7282 parse_start = RExC_parse - 1;
7288 ret = reg_node(pRExC_state,
7289 (U8)(FOLD ? (LOC ? EXACTFL : EXACTF) : EXACT));
7291 for (len = 0, p = RExC_parse - 1;
7292 len < 127 && p < RExC_end;
7295 char * const oldp = p;
7297 if (RExC_flags & RXf_PMf_EXTENDED)
7298 p = regwhite( pRExC_state, p );
7303 if (LOC || !FOLD || !is_TRICKYFOLD_safe(p,RExC_end,UTF))
7304 goto normal_default;
7314 /* Literal Escapes Switch
7316 This switch is meant to handle escape sequences that
7317 resolve to a literal character.
7319 Every escape sequence that represents something
7320 else, like an assertion or a char class, is handled
7321 in the switch marked 'Special Escapes' above in this
7322 routine, but also has an entry here as anything that
7323 isn't explicitly mentioned here will be treated as
7324 an unescaped equivalent literal.
7328 /* These are all the special escapes. */
7332 if (LOC || !FOLD || !is_TRICKYFOLD_safe(p,RExC_end,UTF))
7333 goto normal_default;
7334 case 'A': /* Start assertion */
7335 case 'b': case 'B': /* Word-boundary assertion*/
7336 case 'C': /* Single char !DANGEROUS! */
7337 case 'd': case 'D': /* digit class */
7338 case 'g': case 'G': /* generic-backref, pos assertion */
7339 case 'h': case 'H': /* HORIZWS */
7340 case 'k': case 'K': /* named backref, keep marker */
7341 case 'N': /* named char sequence */
7342 case 'p': case 'P': /* Unicode property */
7343 case 'R': /* LNBREAK */
7344 case 's': case 'S': /* space class */
7345 case 'v': case 'V': /* VERTWS */
7346 case 'w': case 'W': /* word class */
7347 case 'X': /* eXtended Unicode "combining character sequence" */
7348 case 'z': case 'Z': /* End of line/string assertion */
7352 /* Anything after here is an escape that resolves to a
7353 literal. (Except digits, which may or may not)
7372 ender = ASCII_TO_NATIVE('\033');
7376 ender = ASCII_TO_NATIVE('\007');
7381 char* const e = strchr(p, '}');
7385 vFAIL("Missing right brace on \\x{}");
7388 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
7389 | PERL_SCAN_DISALLOW_PREFIX;
7390 STRLEN numlen = e - p - 1;
7391 ender = grok_hex(p + 1, &numlen, &flags, NULL);
7398 I32 flags = PERL_SCAN_DISALLOW_PREFIX;
7400 ender = grok_hex(p, &numlen, &flags, NULL);
7403 if (PL_encoding && ender < 0x100)
7404 goto recode_encoding;
7408 ender = UCHARAT(p++);
7409 ender = toCTRL(ender);
7411 case '0': case '1': case '2': case '3':case '4':
7412 case '5': case '6': case '7': case '8':case '9':
7414 (isDIGIT(p[1]) && atoi(p) >= RExC_npar) ) {
7417 ender = grok_oct(p, &numlen, &flags, NULL);
7424 if (PL_encoding && ender < 0x100)
7425 goto recode_encoding;
7429 SV* enc = PL_encoding;
7430 ender = reg_recode((const char)(U8)ender, &enc);
7431 if (!enc && SIZE_ONLY && ckWARN(WARN_REGEXP))
7432 vWARN(p, "Invalid escape in the specified encoding");
7438 FAIL("Trailing \\");
7441 if (!SIZE_ONLY&& isALPHA(*p) && ckWARN(WARN_REGEXP))
7442 vWARN2(p + 1, "Unrecognized escape \\%c passed through", UCHARAT(p));
7443 goto normal_default;
7448 if (UTF8_IS_START(*p) && UTF) {
7450 ender = utf8n_to_uvchr((U8*)p, RExC_end - p,
7451 &numlen, UTF8_ALLOW_DEFAULT);
7458 if ( RExC_flags & RXf_PMf_EXTENDED)
7459 p = regwhite( pRExC_state, p );
7461 /* Prime the casefolded buffer. */
7462 ender = toFOLD_uni(ender, tmpbuf, &foldlen);
7464 if (p < RExC_end && ISMULT2(p)) { /* Back off on ?+*. */
7469 /* Emit all the Unicode characters. */
7471 for (foldbuf = tmpbuf;
7473 foldlen -= numlen) {
7474 ender = utf8_to_uvchr(foldbuf, &numlen);
7476 const STRLEN unilen = reguni(pRExC_state, ender, s);
7479 /* In EBCDIC the numlen
7480 * and unilen can differ. */
7482 if (numlen >= foldlen)
7486 break; /* "Can't happen." */
7490 const STRLEN unilen = reguni(pRExC_state, ender, s);
7499 REGC((char)ender, s++);
7505 /* Emit all the Unicode characters. */
7507 for (foldbuf = tmpbuf;
7509 foldlen -= numlen) {
7510 ender = utf8_to_uvchr(foldbuf, &numlen);
7512 const STRLEN unilen = reguni(pRExC_state, ender, s);
7515 /* In EBCDIC the numlen
7516 * and unilen can differ. */
7518 if (numlen >= foldlen)
7526 const STRLEN unilen = reguni(pRExC_state, ender, s);
7535 REGC((char)ender, s++);
7539 Set_Node_Cur_Length(ret); /* MJD */
7540 nextchar(pRExC_state);
7542 /* len is STRLEN which is unsigned, need to copy to signed */
7545 vFAIL("Internal disaster");
7549 if (len == 1 && UNI_IS_INVARIANT(ender))
7553 RExC_size += STR_SZ(len);
7556 RExC_emit += STR_SZ(len);
7566 S_regwhite( RExC_state_t *pRExC_state, char *p )
7568 const char *e = RExC_end;
7570 PERL_ARGS_ASSERT_REGWHITE;
7575 else if (*p == '#') {
7584 RExC_seen |= REG_SEEN_RUN_ON_COMMENT;
7592 /* Parse POSIX character classes: [[:foo:]], [[=foo=]], [[.foo.]].
7593 Character classes ([:foo:]) can also be negated ([:^foo:]).
7594 Returns a named class id (ANYOF_XXX) if successful, -1 otherwise.
7595 Equivalence classes ([=foo=]) and composites ([.foo.]) are parsed,
7596 but trigger failures because they are currently unimplemented. */
7598 #define POSIXCC_DONE(c) ((c) == ':')
7599 #define POSIXCC_NOTYET(c) ((c) == '=' || (c) == '.')
7600 #define POSIXCC(c) (POSIXCC_DONE(c) || POSIXCC_NOTYET(c))
7603 S_regpposixcc(pTHX_ RExC_state_t *pRExC_state, I32 value)
7606 I32 namedclass = OOB_NAMEDCLASS;
7608 PERL_ARGS_ASSERT_REGPPOSIXCC;
7610 if (value == '[' && RExC_parse + 1 < RExC_end &&
7611 /* I smell either [: or [= or [. -- POSIX has been here, right? */
7612 POSIXCC(UCHARAT(RExC_parse))) {
7613 const char c = UCHARAT(RExC_parse);
7614 char* const s = RExC_parse++;
7616 while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != c)
7618 if (RExC_parse == RExC_end)
7619 /* Grandfather lone [:, [=, [. */
7622 const char* const t = RExC_parse++; /* skip over the c */
7625 if (UCHARAT(RExC_parse) == ']') {
7626 const char *posixcc = s + 1;
7627 RExC_parse++; /* skip over the ending ] */
7630 const I32 complement = *posixcc == '^' ? *posixcc++ : 0;
7631 const I32 skip = t - posixcc;
7633 /* Initially switch on the length of the name. */
7636 if (memEQ(posixcc, "word", 4)) /* this is not POSIX, this is the Perl \w */
7637 namedclass = complement ? ANYOF_NALNUM : ANYOF_ALNUM;
7640 /* Names all of length 5. */
7641 /* alnum alpha ascii blank cntrl digit graph lower
7642 print punct space upper */
7643 /* Offset 4 gives the best switch position. */
7644 switch (posixcc[4]) {
7646 if (memEQ(posixcc, "alph", 4)) /* alpha */
7647 namedclass = complement ? ANYOF_NALPHA : ANYOF_ALPHA;
7650 if (memEQ(posixcc, "spac", 4)) /* space */
7651 namedclass = complement ? ANYOF_NPSXSPC : ANYOF_PSXSPC;
7654 if (memEQ(posixcc, "grap", 4)) /* graph */
7655 namedclass = complement ? ANYOF_NGRAPH : ANYOF_GRAPH;
7658 if (memEQ(posixcc, "asci", 4)) /* ascii */
7659 namedclass = complement ? ANYOF_NASCII : ANYOF_ASCII;
7662 if (memEQ(posixcc, "blan", 4)) /* blank */
7663 namedclass = complement ? ANYOF_NBLANK : ANYOF_BLANK;
7666 if (memEQ(posixcc, "cntr", 4)) /* cntrl */
7667 namedclass = complement ? ANYOF_NCNTRL : ANYOF_CNTRL;
7670 if (memEQ(posixcc, "alnu", 4)) /* alnum */
7671 namedclass = complement ? ANYOF_NALNUMC : ANYOF_ALNUMC;
7674 if (memEQ(posixcc, "lowe", 4)) /* lower */
7675 namedclass = complement ? ANYOF_NLOWER : ANYOF_LOWER;
7676 else if (memEQ(posixcc, "uppe", 4)) /* upper */
7677 namedclass = complement ? ANYOF_NUPPER : ANYOF_UPPER;
7680 if (memEQ(posixcc, "digi", 4)) /* digit */
7681 namedclass = complement ? ANYOF_NDIGIT : ANYOF_DIGIT;
7682 else if (memEQ(posixcc, "prin", 4)) /* print */
7683 namedclass = complement ? ANYOF_NPRINT : ANYOF_PRINT;
7684 else if (memEQ(posixcc, "punc", 4)) /* punct */
7685 namedclass = complement ? ANYOF_NPUNCT : ANYOF_PUNCT;
7690 if (memEQ(posixcc, "xdigit", 6))
7691 namedclass = complement ? ANYOF_NXDIGIT : ANYOF_XDIGIT;
7695 if (namedclass == OOB_NAMEDCLASS)
7696 Simple_vFAIL3("POSIX class [:%.*s:] unknown",
7698 assert (posixcc[skip] == ':');
7699 assert (posixcc[skip+1] == ']');
7700 } else if (!SIZE_ONLY) {
7701 /* [[=foo=]] and [[.foo.]] are still future. */
7703 /* adjust RExC_parse so the warning shows after
7705 while (UCHARAT(RExC_parse) && UCHARAT(RExC_parse) != ']')
7707 Simple_vFAIL3("POSIX syntax [%c %c] is reserved for future extensions", c, c);
7710 /* Maternal grandfather:
7711 * "[:" ending in ":" but not in ":]" */
7721 S_checkposixcc(pTHX_ RExC_state_t *pRExC_state)
7725 PERL_ARGS_ASSERT_CHECKPOSIXCC;
7727 if (POSIXCC(UCHARAT(RExC_parse))) {
7728 const char *s = RExC_parse;
7729 const char c = *s++;
7733 if (*s && c == *s && s[1] == ']') {
7734 if (ckWARN(WARN_REGEXP))
7736 "POSIX syntax [%c %c] belongs inside character classes",
7739 /* [[=foo=]] and [[.foo.]] are still future. */
7740 if (POSIXCC_NOTYET(c)) {
7741 /* adjust RExC_parse so the error shows after
7743 while (UCHARAT(RExC_parse) && UCHARAT(RExC_parse++) != ']')
7745 Simple_vFAIL3("POSIX syntax [%c %c] is reserved for future extensions", c, c);
7752 #define _C_C_T_(NAME,TEST,WORD) \
7755 ANYOF_CLASS_SET(ret, ANYOF_##NAME); \
7757 for (value = 0; value < 256; value++) \
7759 ANYOF_BITMAP_SET(ret, value); \
7764 case ANYOF_N##NAME: \
7766 ANYOF_CLASS_SET(ret, ANYOF_N##NAME); \
7768 for (value = 0; value < 256; value++) \
7770 ANYOF_BITMAP_SET(ret, value); \
7776 #define _C_C_T_NOLOC_(NAME,TEST,WORD) \
7778 for (value = 0; value < 256; value++) \
7780 ANYOF_BITMAP_SET(ret, value); \
7784 case ANYOF_N##NAME: \
7785 for (value = 0; value < 256; value++) \
7787 ANYOF_BITMAP_SET(ret, value); \
7793 parse a class specification and produce either an ANYOF node that
7794 matches the pattern or if the pattern matches a single char only and
7795 that char is < 256 and we are case insensitive then we produce an
7800 S_regclass(pTHX_ RExC_state_t *pRExC_state, U32 depth)
7803 register UV nextvalue;
7804 register IV prevvalue = OOB_UNICODE;
7805 register IV range = 0;
7806 UV value = 0; /* XXX:dmq: needs to be referenceable (unfortunately) */
7807 register regnode *ret;
7810 char *rangebegin = NULL;
7811 bool need_class = 0;
7814 bool optimize_invert = TRUE;
7815 AV* unicode_alternate = NULL;
7817 UV literal_endpoint = 0;
7819 UV stored = 0; /* number of chars stored in the class */
7821 regnode * const orig_emit = RExC_emit; /* Save the original RExC_emit in
7822 case we need to change the emitted regop to an EXACT. */
7823 const char * orig_parse = RExC_parse;
7824 GET_RE_DEBUG_FLAGS_DECL;
7826 PERL_ARGS_ASSERT_REGCLASS;
7828 PERL_UNUSED_ARG(depth);
7831 DEBUG_PARSE("clas");
7833 /* Assume we are going to generate an ANYOF node. */
7834 ret = reganode(pRExC_state, ANYOF, 0);
7837 ANYOF_FLAGS(ret) = 0;
7839 if (UCHARAT(RExC_parse) == '^') { /* Complement of range. */
7843 ANYOF_FLAGS(ret) |= ANYOF_INVERT;
7847 RExC_size += ANYOF_SKIP;
7848 listsv = &PL_sv_undef; /* For code scanners: listsv always non-NULL. */
7851 RExC_emit += ANYOF_SKIP;
7853 ANYOF_FLAGS(ret) |= ANYOF_FOLD;
7855 ANYOF_FLAGS(ret) |= ANYOF_LOCALE;
7856 ANYOF_BITMAP_ZERO(ret);
7857 listsv = newSVpvs("# comment\n");
7860 nextvalue = RExC_parse < RExC_end ? UCHARAT(RExC_parse) : 0;
7862 if (!SIZE_ONLY && POSIXCC(nextvalue))
7863 checkposixcc(pRExC_state);
7865 /* allow 1st char to be ] (allowing it to be - is dealt with later) */
7866 if (UCHARAT(RExC_parse) == ']')
7870 while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != ']') {
7874 namedclass = OOB_NAMEDCLASS; /* initialize as illegal */
7877 rangebegin = RExC_parse;
7879 value = utf8n_to_uvchr((U8*)RExC_parse,
7880 RExC_end - RExC_parse,
7881 &numlen, UTF8_ALLOW_DEFAULT);
7882 RExC_parse += numlen;
7885 value = UCHARAT(RExC_parse++);
7887 nextvalue = RExC_parse < RExC_end ? UCHARAT(RExC_parse) : 0;
7888 if (value == '[' && POSIXCC(nextvalue))
7889 namedclass = regpposixcc(pRExC_state, value);
7890 else if (value == '\\') {
7892 value = utf8n_to_uvchr((U8*)RExC_parse,
7893 RExC_end - RExC_parse,
7894 &numlen, UTF8_ALLOW_DEFAULT);
7895 RExC_parse += numlen;
7898 value = UCHARAT(RExC_parse++);
7899 /* Some compilers cannot handle switching on 64-bit integer
7900 * values, therefore value cannot be an UV. Yes, this will
7901 * be a problem later if we want switch on Unicode.
7902 * A similar issue a little bit later when switching on
7903 * namedclass. --jhi */
7904 switch ((I32)value) {
7905 case 'w': namedclass = ANYOF_ALNUM; break;
7906 case 'W': namedclass = ANYOF_NALNUM; break;
7907 case 's': namedclass = ANYOF_SPACE; break;
7908 case 'S': namedclass = ANYOF_NSPACE; break;
7909 case 'd': namedclass = ANYOF_DIGIT; break;
7910 case 'D': namedclass = ANYOF_NDIGIT; break;
7911 case 'v': namedclass = ANYOF_VERTWS; break;
7912 case 'V': namedclass = ANYOF_NVERTWS; break;
7913 case 'h': namedclass = ANYOF_HORIZWS; break;
7914 case 'H': namedclass = ANYOF_NHORIZWS; break;
7915 case 'N': /* Handle \N{NAME} in class */
7917 /* We only pay attention to the first char of
7918 multichar strings being returned. I kinda wonder
7919 if this makes sense as it does change the behaviour
7920 from earlier versions, OTOH that behaviour was broken
7922 UV v; /* value is register so we cant & it /grrr */
7923 if (reg_namedseq(pRExC_state, &v)) {
7933 if (RExC_parse >= RExC_end)
7934 vFAIL2("Empty \\%c{}", (U8)value);
7935 if (*RExC_parse == '{') {
7936 const U8 c = (U8)value;
7937 e = strchr(RExC_parse++, '}');
7939 vFAIL2("Missing right brace on \\%c{}", c);
7940 while (isSPACE(UCHARAT(RExC_parse)))
7942 if (e == RExC_parse)
7943 vFAIL2("Empty \\%c{}", c);
7945 while (isSPACE(UCHARAT(RExC_parse + n - 1)))
7953 if (UCHARAT(RExC_parse) == '^') {
7956 value = value == 'p' ? 'P' : 'p'; /* toggle */
7957 while (isSPACE(UCHARAT(RExC_parse))) {
7962 Perl_sv_catpvf(aTHX_ listsv, "%cutf8::%.*s\n",
7963 (value=='p' ? '+' : '!'), (int)n, RExC_parse);
7966 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
7967 namedclass = ANYOF_MAX; /* no official name, but it's named */
7970 case 'n': value = '\n'; break;
7971 case 'r': value = '\r'; break;
7972 case 't': value = '\t'; break;
7973 case 'f': value = '\f'; break;
7974 case 'b': value = '\b'; break;
7975 case 'e': value = ASCII_TO_NATIVE('\033');break;
7976 case 'a': value = ASCII_TO_NATIVE('\007');break;
7978 if (*RExC_parse == '{') {
7979 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
7980 | PERL_SCAN_DISALLOW_PREFIX;
7981 char * const e = strchr(RExC_parse++, '}');
7983 vFAIL("Missing right brace on \\x{}");
7985 numlen = e - RExC_parse;
7986 value = grok_hex(RExC_parse, &numlen, &flags, NULL);
7990 I32 flags = PERL_SCAN_DISALLOW_PREFIX;
7992 value = grok_hex(RExC_parse, &numlen, &flags, NULL);
7993 RExC_parse += numlen;
7995 if (PL_encoding && value < 0x100)
7996 goto recode_encoding;
7999 value = UCHARAT(RExC_parse++);
8000 value = toCTRL(value);
8002 case '0': case '1': case '2': case '3': case '4':
8003 case '5': case '6': case '7': case '8': case '9':
8007 value = grok_oct(--RExC_parse, &numlen, &flags, NULL);
8008 RExC_parse += numlen;
8009 if (PL_encoding && value < 0x100)
8010 goto recode_encoding;
8015 SV* enc = PL_encoding;
8016 value = reg_recode((const char)(U8)value, &enc);
8017 if (!enc && SIZE_ONLY && ckWARN(WARN_REGEXP))
8019 "Invalid escape in the specified encoding");
8023 if (!SIZE_ONLY && isALPHA(value) && ckWARN(WARN_REGEXP))
8025 "Unrecognized escape \\%c in character class passed through",
8029 } /* end of \blah */
8035 if (namedclass > OOB_NAMEDCLASS) { /* this is a named class \blah */
8037 if (!SIZE_ONLY && !need_class)
8038 ANYOF_CLASS_ZERO(ret);
8042 /* a bad range like a-\d, a-[:digit:] ? */
8045 if (ckWARN(WARN_REGEXP)) {
8047 RExC_parse >= rangebegin ?
8048 RExC_parse - rangebegin : 0;
8050 "False [] range \"%*.*s\"",
8053 if (prevvalue < 256) {
8054 ANYOF_BITMAP_SET(ret, prevvalue);
8055 ANYOF_BITMAP_SET(ret, '-');
8058 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
8059 Perl_sv_catpvf(aTHX_ listsv,
8060 "%04"UVxf"\n%04"UVxf"\n", (UV)prevvalue, (UV) '-');
8064 range = 0; /* this was not a true range */
8070 const char *what = NULL;
8073 if (namedclass > OOB_NAMEDCLASS)
8074 optimize_invert = FALSE;
8075 /* Possible truncation here but in some 64-bit environments
8076 * the compiler gets heartburn about switch on 64-bit values.
8077 * A similar issue a little earlier when switching on value.
8079 switch ((I32)namedclass) {
8080 case _C_C_T_(ALNUM, isALNUM(value), "Word");
8081 case _C_C_T_(ALNUMC, isALNUMC(value), "Alnum");
8082 case _C_C_T_(ALPHA, isALPHA(value), "Alpha");
8083 case _C_C_T_(BLANK, isBLANK(value), "Blank");
8084 case _C_C_T_(CNTRL, isCNTRL(value), "Cntrl");
8085 case _C_C_T_(GRAPH, isGRAPH(value), "Graph");
8086 case _C_C_T_(LOWER, isLOWER(value), "Lower");
8087 case _C_C_T_(PRINT, isPRINT(value), "Print");
8088 case _C_C_T_(PSXSPC, isPSXSPC(value), "Space");
8089 case _C_C_T_(PUNCT, isPUNCT(value), "Punct");
8090 case _C_C_T_(SPACE, isSPACE(value), "SpacePerl");
8091 case _C_C_T_(UPPER, isUPPER(value), "Upper");
8092 case _C_C_T_(XDIGIT, isXDIGIT(value), "XDigit");
8093 case _C_C_T_NOLOC_(VERTWS, is_VERTWS_latin1(&value), "VertSpace");
8094 case _C_C_T_NOLOC_(HORIZWS, is_HORIZWS_latin1(&value), "HorizSpace");
8097 ANYOF_CLASS_SET(ret, ANYOF_ASCII);
8100 for (value = 0; value < 128; value++)
8101 ANYOF_BITMAP_SET(ret, value);
8103 for (value = 0; value < 256; value++) {
8105 ANYOF_BITMAP_SET(ret, value);
8114 ANYOF_CLASS_SET(ret, ANYOF_NASCII);
8117 for (value = 128; value < 256; value++)
8118 ANYOF_BITMAP_SET(ret, value);
8120 for (value = 0; value < 256; value++) {
8121 if (!isASCII(value))
8122 ANYOF_BITMAP_SET(ret, value);
8131 ANYOF_CLASS_SET(ret, ANYOF_DIGIT);
8133 /* consecutive digits assumed */
8134 for (value = '0'; value <= '9'; value++)
8135 ANYOF_BITMAP_SET(ret, value);
8142 ANYOF_CLASS_SET(ret, ANYOF_NDIGIT);
8144 /* consecutive digits assumed */
8145 for (value = 0; value < '0'; value++)
8146 ANYOF_BITMAP_SET(ret, value);
8147 for (value = '9' + 1; value < 256; value++)
8148 ANYOF_BITMAP_SET(ret, value);
8154 /* this is to handle \p and \P */
8157 vFAIL("Invalid [::] class");
8161 /* Strings such as "+utf8::isWord\n" */
8162 Perl_sv_catpvf(aTHX_ listsv, "%cutf8::Is%s\n", yesno, what);
8165 ANYOF_FLAGS(ret) |= ANYOF_CLASS;
8168 } /* end of namedclass \blah */
8171 if (prevvalue > (IV)value) /* b-a */ {
8172 const int w = RExC_parse - rangebegin;
8173 Simple_vFAIL4("Invalid [] range \"%*.*s\"", w, w, rangebegin);
8174 range = 0; /* not a valid range */
8178 prevvalue = value; /* save the beginning of the range */
8179 if (*RExC_parse == '-' && RExC_parse+1 < RExC_end &&
8180 RExC_parse[1] != ']') {
8183 /* a bad range like \w-, [:word:]- ? */
8184 if (namedclass > OOB_NAMEDCLASS) {
8185 if (ckWARN(WARN_REGEXP)) {
8187 RExC_parse >= rangebegin ?
8188 RExC_parse - rangebegin : 0;
8190 "False [] range \"%*.*s\"",
8194 ANYOF_BITMAP_SET(ret, '-');
8196 range = 1; /* yeah, it's a range! */
8197 continue; /* but do it the next time */
8201 /* now is the next time */
8202 /*stored += (value - prevvalue + 1);*/
8204 if (prevvalue < 256) {
8205 const IV ceilvalue = value < 256 ? value : 255;
8208 /* In EBCDIC [\x89-\x91] should include
8209 * the \x8e but [i-j] should not. */
8210 if (literal_endpoint == 2 &&
8211 ((isLOWER(prevvalue) && isLOWER(ceilvalue)) ||
8212 (isUPPER(prevvalue) && isUPPER(ceilvalue))))
8214 if (isLOWER(prevvalue)) {
8215 for (i = prevvalue; i <= ceilvalue; i++)
8216 if (isLOWER(i) && !ANYOF_BITMAP_TEST(ret,i)) {
8218 ANYOF_BITMAP_SET(ret, i);
8221 for (i = prevvalue; i <= ceilvalue; i++)
8222 if (isUPPER(i) && !ANYOF_BITMAP_TEST(ret,i)) {
8224 ANYOF_BITMAP_SET(ret, i);
8230 for (i = prevvalue; i <= ceilvalue; i++) {
8231 if (!ANYOF_BITMAP_TEST(ret,i)) {
8233 ANYOF_BITMAP_SET(ret, i);
8237 if (value > 255 || UTF) {
8238 const UV prevnatvalue = NATIVE_TO_UNI(prevvalue);
8239 const UV natvalue = NATIVE_TO_UNI(value);
8240 stored+=2; /* can't optimize this class */
8241 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
8242 if (prevnatvalue < natvalue) { /* what about > ? */
8243 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\t%04"UVxf"\n",
8244 prevnatvalue, natvalue);
8246 else if (prevnatvalue == natvalue) {
8247 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n", natvalue);
8249 U8 foldbuf[UTF8_MAXBYTES_CASE+1];
8251 const UV f = to_uni_fold(natvalue, foldbuf, &foldlen);
8253 #ifdef EBCDIC /* RD t/uni/fold ff and 6b */
8254 if (RExC_precomp[0] == ':' &&
8255 RExC_precomp[1] == '[' &&
8256 (f == 0xDF || f == 0x92)) {
8257 f = NATIVE_TO_UNI(f);
8260 /* If folding and foldable and a single
8261 * character, insert also the folded version
8262 * to the charclass. */
8264 #ifdef EBCDIC /* RD tunifold ligatures s,t fb05, fb06 */
8265 if ((RExC_precomp[0] == ':' &&
8266 RExC_precomp[1] == '[' &&
8268 (value == 0xFB05 || value == 0xFB06))) ?
8269 foldlen == ((STRLEN)UNISKIP(f) - 1) :
8270 foldlen == (STRLEN)UNISKIP(f) )
8272 if (foldlen == (STRLEN)UNISKIP(f))
8274 Perl_sv_catpvf(aTHX_ listsv,
8277 /* Any multicharacter foldings
8278 * require the following transform:
8279 * [ABCDEF] -> (?:[ABCabcDEFd]|pq|rst)
8280 * where E folds into "pq" and F folds
8281 * into "rst", all other characters
8282 * fold to single characters. We save
8283 * away these multicharacter foldings,
8284 * to be later saved as part of the
8285 * additional "s" data. */
8288 if (!unicode_alternate)
8289 unicode_alternate = newAV();
8290 sv = newSVpvn_utf8((char*)foldbuf, foldlen,
8292 av_push(unicode_alternate, sv);
8296 /* If folding and the value is one of the Greek
8297 * sigmas insert a few more sigmas to make the
8298 * folding rules of the sigmas to work right.
8299 * Note that not all the possible combinations
8300 * are handled here: some of them are handled
8301 * by the standard folding rules, and some of
8302 * them (literal or EXACTF cases) are handled
8303 * during runtime in regexec.c:S_find_byclass(). */
8304 if (value == UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA) {
8305 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
8306 (UV)UNICODE_GREEK_CAPITAL_LETTER_SIGMA);
8307 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
8308 (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA);
8310 else if (value == UNICODE_GREEK_CAPITAL_LETTER_SIGMA)
8311 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
8312 (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA);
8317 literal_endpoint = 0;
8321 range = 0; /* this range (if it was one) is done now */
8325 ANYOF_FLAGS(ret) |= ANYOF_LARGE;
8327 RExC_size += ANYOF_CLASS_ADD_SKIP;
8329 RExC_emit += ANYOF_CLASS_ADD_SKIP;
8335 /****** !SIZE_ONLY AFTER HERE *********/
8337 if( stored == 1 && (value < 128 || (value < 256 && !UTF))
8338 && !( ANYOF_FLAGS(ret) & ( ANYOF_FLAGS_ALL ^ ANYOF_FOLD ) )
8340 /* optimize single char class to an EXACT node
8341 but *only* when its not a UTF/high char */
8342 const char * cur_parse= RExC_parse;
8343 RExC_emit = (regnode *)orig_emit;
8344 RExC_parse = (char *)orig_parse;
8345 ret = reg_node(pRExC_state,
8346 (U8)((ANYOF_FLAGS(ret) & ANYOF_FOLD) ? EXACTF : EXACT));
8347 RExC_parse = (char *)cur_parse;
8348 *STRING(ret)= (char)value;
8350 RExC_emit += STR_SZ(1);
8353 /* optimize case-insensitive simple patterns (e.g. /[a-z]/i) */
8354 if ( /* If the only flag is folding (plus possibly inversion). */
8355 ((ANYOF_FLAGS(ret) & (ANYOF_FLAGS_ALL ^ ANYOF_INVERT)) == ANYOF_FOLD)
8357 for (value = 0; value < 256; ++value) {
8358 if (ANYOF_BITMAP_TEST(ret, value)) {
8359 UV fold = PL_fold[value];
8362 ANYOF_BITMAP_SET(ret, fold);
8365 ANYOF_FLAGS(ret) &= ~ANYOF_FOLD;
8368 /* optimize inverted simple patterns (e.g. [^a-z]) */
8369 if (optimize_invert &&
8370 /* If the only flag is inversion. */
8371 (ANYOF_FLAGS(ret) & ANYOF_FLAGS_ALL) == ANYOF_INVERT) {
8372 for (value = 0; value < ANYOF_BITMAP_SIZE; ++value)
8373 ANYOF_BITMAP(ret)[value] ^= ANYOF_FLAGS_ALL;
8374 ANYOF_FLAGS(ret) = ANYOF_UNICODE_ALL;
8377 AV * const av = newAV();
8379 /* The 0th element stores the character class description
8380 * in its textual form: used later (regexec.c:Perl_regclass_swash())
8381 * to initialize the appropriate swash (which gets stored in
8382 * the 1st element), and also useful for dumping the regnode.
8383 * The 2nd element stores the multicharacter foldings,
8384 * used later (regexec.c:S_reginclass()). */
8385 av_store(av, 0, listsv);
8386 av_store(av, 1, NULL);
8387 av_store(av, 2, (SV*)unicode_alternate);
8388 rv = newRV_noinc((SV*)av);
8389 n = add_data(pRExC_state, 1, "s");
8390 RExC_rxi->data->data[n] = (void*)rv;
8398 /* reg_skipcomment()
8400 Absorbs an /x style # comments from the input stream.
8401 Returns true if there is more text remaining in the stream.
8402 Will set the REG_SEEN_RUN_ON_COMMENT flag if the comment
8403 terminates the pattern without including a newline.
8405 Note its the callers responsibility to ensure that we are
8411 S_reg_skipcomment(pTHX_ RExC_state_t *pRExC_state)
8415 PERL_ARGS_ASSERT_REG_SKIPCOMMENT;
8417 while (RExC_parse < RExC_end)
8418 if (*RExC_parse++ == '\n') {
8423 /* we ran off the end of the pattern without ending
8424 the comment, so we have to add an \n when wrapping */
8425 RExC_seen |= REG_SEEN_RUN_ON_COMMENT;
8433 Advance that parse position, and optionall absorbs
8434 "whitespace" from the inputstream.
8436 Without /x "whitespace" means (?#...) style comments only,
8437 with /x this means (?#...) and # comments and whitespace proper.
8439 Returns the RExC_parse point from BEFORE the scan occurs.
8441 This is the /x friendly way of saying RExC_parse++.
8445 S_nextchar(pTHX_ RExC_state_t *pRExC_state)
8447 char* const retval = RExC_parse++;
8449 PERL_ARGS_ASSERT_NEXTCHAR;
8452 if (*RExC_parse == '(' && RExC_parse[1] == '?' &&
8453 RExC_parse[2] == '#') {
8454 while (*RExC_parse != ')') {
8455 if (RExC_parse == RExC_end)
8456 FAIL("Sequence (?#... not terminated");
8462 if (RExC_flags & RXf_PMf_EXTENDED) {
8463 if (isSPACE(*RExC_parse)) {
8467 else if (*RExC_parse == '#') {
8468 if ( reg_skipcomment( pRExC_state ) )
8477 - reg_node - emit a node
8479 STATIC regnode * /* Location. */
8480 S_reg_node(pTHX_ RExC_state_t *pRExC_state, U8 op)
8483 register regnode *ptr;
8484 regnode * const ret = RExC_emit;
8485 GET_RE_DEBUG_FLAGS_DECL;
8487 PERL_ARGS_ASSERT_REG_NODE;
8490 SIZE_ALIGN(RExC_size);
8494 if (RExC_emit >= RExC_emit_bound)
8495 Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %d", op);
8497 NODE_ALIGN_FILL(ret);
8499 FILL_ADVANCE_NODE(ptr, op);
8500 #ifdef RE_TRACK_PATTERN_OFFSETS
8501 if (RExC_offsets) { /* MJD */
8502 MJD_OFFSET_DEBUG(("%s:%d: (op %s) %s %"UVuf" (len %"UVuf") (max %"UVuf").\n",
8503 "reg_node", __LINE__,
8505 (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0]
8506 ? "Overwriting end of array!\n" : "OK",
8507 (UV)(RExC_emit - RExC_emit_start),
8508 (UV)(RExC_parse - RExC_start),
8509 (UV)RExC_offsets[0]));
8510 Set_Node_Offset(RExC_emit, RExC_parse + (op == END));
8518 - reganode - emit a node with an argument
8520 STATIC regnode * /* Location. */
8521 S_reganode(pTHX_ RExC_state_t *pRExC_state, U8 op, U32 arg)
8524 register regnode *ptr;
8525 regnode * const ret = RExC_emit;
8526 GET_RE_DEBUG_FLAGS_DECL;
8528 PERL_ARGS_ASSERT_REGANODE;
8531 SIZE_ALIGN(RExC_size);
8536 assert(2==regarglen[op]+1);
8538 Anything larger than this has to allocate the extra amount.
8539 If we changed this to be:
8541 RExC_size += (1 + regarglen[op]);
8543 then it wouldn't matter. Its not clear what side effect
8544 might come from that so its not done so far.
8549 if (RExC_emit >= RExC_emit_bound)
8550 Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %d", op);
8552 NODE_ALIGN_FILL(ret);
8554 FILL_ADVANCE_NODE_ARG(ptr, op, arg);
8555 #ifdef RE_TRACK_PATTERN_OFFSETS
8556 if (RExC_offsets) { /* MJD */
8557 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
8561 (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0] ?
8562 "Overwriting end of array!\n" : "OK",
8563 (UV)(RExC_emit - RExC_emit_start),
8564 (UV)(RExC_parse - RExC_start),
8565 (UV)RExC_offsets[0]));
8566 Set_Cur_Node_Offset;
8574 - reguni - emit (if appropriate) a Unicode character
8577 S_reguni(pTHX_ const RExC_state_t *pRExC_state, UV uv, char* s)
8581 PERL_ARGS_ASSERT_REGUNI;
8583 return SIZE_ONLY ? UNISKIP(uv) : (uvchr_to_utf8((U8*)s, uv) - (U8*)s);
8587 - reginsert - insert an operator in front of already-emitted operand
8589 * Means relocating the operand.
8592 S_reginsert(pTHX_ RExC_state_t *pRExC_state, U8 op, regnode *opnd, U32 depth)
8595 register regnode *src;
8596 register regnode *dst;
8597 register regnode *place;
8598 const int offset = regarglen[(U8)op];
8599 const int size = NODE_STEP_REGNODE + offset;
8600 GET_RE_DEBUG_FLAGS_DECL;
8602 PERL_ARGS_ASSERT_REGINSERT;
8603 PERL_UNUSED_ARG(depth);
8604 /* (PL_regkind[(U8)op] == CURLY ? EXTRA_STEP_2ARGS : 0); */
8605 DEBUG_PARSE_FMT("inst"," - %s",PL_reg_name[op]);
8614 if (RExC_open_parens) {
8616 /*DEBUG_PARSE_FMT("inst"," - %"IVdf, (IV)RExC_npar);*/
8617 for ( paren=0 ; paren < RExC_npar ; paren++ ) {
8618 if ( RExC_open_parens[paren] >= opnd ) {
8619 /*DEBUG_PARSE_FMT("open"," - %d",size);*/
8620 RExC_open_parens[paren] += size;
8622 /*DEBUG_PARSE_FMT("open"," - %s","ok");*/
8624 if ( RExC_close_parens[paren] >= opnd ) {
8625 /*DEBUG_PARSE_FMT("close"," - %d",size);*/
8626 RExC_close_parens[paren] += size;
8628 /*DEBUG_PARSE_FMT("close"," - %s","ok");*/
8633 while (src > opnd) {
8634 StructCopy(--src, --dst, regnode);
8635 #ifdef RE_TRACK_PATTERN_OFFSETS
8636 if (RExC_offsets) { /* MJD 20010112 */
8637 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s copy %"UVuf" -> %"UVuf" (max %"UVuf").\n",
8641 (UV)(dst - RExC_emit_start) > RExC_offsets[0]
8642 ? "Overwriting end of array!\n" : "OK",
8643 (UV)(src - RExC_emit_start),
8644 (UV)(dst - RExC_emit_start),
8645 (UV)RExC_offsets[0]));
8646 Set_Node_Offset_To_R(dst-RExC_emit_start, Node_Offset(src));
8647 Set_Node_Length_To_R(dst-RExC_emit_start, Node_Length(src));
8653 place = opnd; /* Op node, where operand used to be. */
8654 #ifdef RE_TRACK_PATTERN_OFFSETS
8655 if (RExC_offsets) { /* MJD */
8656 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
8660 (UV)(place - RExC_emit_start) > RExC_offsets[0]
8661 ? "Overwriting end of array!\n" : "OK",
8662 (UV)(place - RExC_emit_start),
8663 (UV)(RExC_parse - RExC_start),
8664 (UV)RExC_offsets[0]));
8665 Set_Node_Offset(place, RExC_parse);
8666 Set_Node_Length(place, 1);
8669 src = NEXTOPER(place);
8670 FILL_ADVANCE_NODE(place, op);
8671 Zero(src, offset, regnode);
8675 - regtail - set the next-pointer at the end of a node chain of p to val.
8676 - SEE ALSO: regtail_study
8678 /* TODO: All three parms should be const */
8680 S_regtail(pTHX_ RExC_state_t *pRExC_state, regnode *p, const regnode *val,U32 depth)
8683 register regnode *scan;
8684 GET_RE_DEBUG_FLAGS_DECL;
8686 PERL_ARGS_ASSERT_REGTAIL;
8688 PERL_UNUSED_ARG(depth);
8694 /* Find last node. */
8697 regnode * const temp = regnext(scan);
8699 SV * const mysv=sv_newmortal();
8700 DEBUG_PARSE_MSG((scan==p ? "tail" : ""));
8701 regprop(RExC_rx, mysv, scan);
8702 PerlIO_printf(Perl_debug_log, "~ %s (%d) %s %s\n",
8703 SvPV_nolen_const(mysv), REG_NODE_NUM(scan),
8704 (temp == NULL ? "->" : ""),
8705 (temp == NULL ? PL_reg_name[OP(val)] : "")
8713 if (reg_off_by_arg[OP(scan)]) {
8714 ARG_SET(scan, val - scan);
8717 NEXT_OFF(scan) = val - scan;
8723 - regtail_study - set the next-pointer at the end of a node chain of p to val.
8724 - Look for optimizable sequences at the same time.
8725 - currently only looks for EXACT chains.
8727 This is expermental code. The idea is to use this routine to perform
8728 in place optimizations on branches and groups as they are constructed,
8729 with the long term intention of removing optimization from study_chunk so
8730 that it is purely analytical.
8732 Currently only used when in DEBUG mode. The macro REGTAIL_STUDY() is used
8733 to control which is which.
8736 /* TODO: All four parms should be const */
8739 S_regtail_study(pTHX_ RExC_state_t *pRExC_state, regnode *p, const regnode *val,U32 depth)
8742 register regnode *scan;
8744 #ifdef EXPERIMENTAL_INPLACESCAN
8747 GET_RE_DEBUG_FLAGS_DECL;
8749 PERL_ARGS_ASSERT_REGTAIL_STUDY;
8755 /* Find last node. */
8759 regnode * const temp = regnext(scan);
8760 #ifdef EXPERIMENTAL_INPLACESCAN
8761 if (PL_regkind[OP(scan)] == EXACT)
8762 if (join_exact(pRExC_state,scan,&min,1,val,depth+1))
8770 if( exact == PSEUDO )
8772 else if ( exact != OP(scan) )
8781 SV * const mysv=sv_newmortal();
8782 DEBUG_PARSE_MSG((scan==p ? "tsdy" : ""));
8783 regprop(RExC_rx, mysv, scan);
8784 PerlIO_printf(Perl_debug_log, "~ %s (%d) -> %s\n",
8785 SvPV_nolen_const(mysv),
8787 PL_reg_name[exact]);
8794 SV * const mysv_val=sv_newmortal();
8795 DEBUG_PARSE_MSG("");
8796 regprop(RExC_rx, mysv_val, val);
8797 PerlIO_printf(Perl_debug_log, "~ attach to %s (%"IVdf") offset to %"IVdf"\n",
8798 SvPV_nolen_const(mysv_val),
8799 (IV)REG_NODE_NUM(val),
8803 if (reg_off_by_arg[OP(scan)]) {
8804 ARG_SET(scan, val - scan);
8807 NEXT_OFF(scan) = val - scan;
8815 - regcurly - a little FSA that accepts {\d+,?\d*}
8818 S_regcurly(register const char *s)
8820 PERL_ARGS_ASSERT_REGCURLY;
8839 - regdump - dump a regexp onto Perl_debug_log in vaguely comprehensible form
8843 S_regdump_extflags(pTHX_ const char *lead, const U32 flags)
8848 for (bit=0; bit<32; bit++) {
8849 if (flags & (1<<bit)) {
8851 PerlIO_printf(Perl_debug_log, "%s",lead);
8852 PerlIO_printf(Perl_debug_log, "%s ",PL_reg_extflags_name[bit]);
8857 PerlIO_printf(Perl_debug_log, "\n");
8859 PerlIO_printf(Perl_debug_log, "%s[none-set]\n",lead);
8865 Perl_regdump(pTHX_ const regexp *r)
8869 SV * const sv = sv_newmortal();
8870 SV *dsv= sv_newmortal();
8872 GET_RE_DEBUG_FLAGS_DECL;
8874 PERL_ARGS_ASSERT_REGDUMP;
8876 (void)dumpuntil(r, ri->program, ri->program + 1, NULL, NULL, sv, 0, 0);
8878 /* Header fields of interest. */
8879 if (r->anchored_substr) {
8880 RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->anchored_substr),
8881 RE_SV_DUMPLEN(r->anchored_substr), 30);
8882 PerlIO_printf(Perl_debug_log,
8883 "anchored %s%s at %"IVdf" ",
8884 s, RE_SV_TAIL(r->anchored_substr),
8885 (IV)r->anchored_offset);
8886 } else if (r->anchored_utf8) {
8887 RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->anchored_utf8),
8888 RE_SV_DUMPLEN(r->anchored_utf8), 30);
8889 PerlIO_printf(Perl_debug_log,
8890 "anchored utf8 %s%s at %"IVdf" ",
8891 s, RE_SV_TAIL(r->anchored_utf8),
8892 (IV)r->anchored_offset);
8894 if (r->float_substr) {
8895 RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->float_substr),
8896 RE_SV_DUMPLEN(r->float_substr), 30);
8897 PerlIO_printf(Perl_debug_log,
8898 "floating %s%s at %"IVdf"..%"UVuf" ",
8899 s, RE_SV_TAIL(r->float_substr),
8900 (IV)r->float_min_offset, (UV)r->float_max_offset);
8901 } else if (r->float_utf8) {
8902 RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->float_utf8),
8903 RE_SV_DUMPLEN(r->float_utf8), 30);
8904 PerlIO_printf(Perl_debug_log,
8905 "floating utf8 %s%s at %"IVdf"..%"UVuf" ",
8906 s, RE_SV_TAIL(r->float_utf8),
8907 (IV)r->float_min_offset, (UV)r->float_max_offset);
8909 if (r->check_substr || r->check_utf8)
8910 PerlIO_printf(Perl_debug_log,
8912 (r->check_substr == r->float_substr
8913 && r->check_utf8 == r->float_utf8
8914 ? "(checking floating" : "(checking anchored"));
8915 if (r->extflags & RXf_NOSCAN)
8916 PerlIO_printf(Perl_debug_log, " noscan");
8917 if (r->extflags & RXf_CHECK_ALL)
8918 PerlIO_printf(Perl_debug_log, " isall");
8919 if (r->check_substr || r->check_utf8)
8920 PerlIO_printf(Perl_debug_log, ") ");
8922 if (ri->regstclass) {
8923 regprop(r, sv, ri->regstclass);
8924 PerlIO_printf(Perl_debug_log, "stclass %s ", SvPVX_const(sv));
8926 if (r->extflags & RXf_ANCH) {
8927 PerlIO_printf(Perl_debug_log, "anchored");
8928 if (r->extflags & RXf_ANCH_BOL)
8929 PerlIO_printf(Perl_debug_log, "(BOL)");
8930 if (r->extflags & RXf_ANCH_MBOL)
8931 PerlIO_printf(Perl_debug_log, "(MBOL)");
8932 if (r->extflags & RXf_ANCH_SBOL)
8933 PerlIO_printf(Perl_debug_log, "(SBOL)");
8934 if (r->extflags & RXf_ANCH_GPOS)
8935 PerlIO_printf(Perl_debug_log, "(GPOS)");
8936 PerlIO_putc(Perl_debug_log, ' ');
8938 if (r->extflags & RXf_GPOS_SEEN)
8939 PerlIO_printf(Perl_debug_log, "GPOS:%"UVuf" ", (UV)r->gofs);
8940 if (r->intflags & PREGf_SKIP)
8941 PerlIO_printf(Perl_debug_log, "plus ");
8942 if (r->intflags & PREGf_IMPLICIT)
8943 PerlIO_printf(Perl_debug_log, "implicit ");
8944 PerlIO_printf(Perl_debug_log, "minlen %"IVdf" ", (IV)r->minlen);
8945 if (r->extflags & RXf_EVAL_SEEN)
8946 PerlIO_printf(Perl_debug_log, "with eval ");
8947 PerlIO_printf(Perl_debug_log, "\n");
8948 DEBUG_FLAGS_r(regdump_extflags("r->extflags: ",r->extflags));
8950 PERL_ARGS_ASSERT_REGDUMP;
8951 PERL_UNUSED_CONTEXT;
8953 #endif /* DEBUGGING */
8957 - regprop - printable representation of opcode
8960 Perl_regprop(pTHX_ const regexp *prog, SV *sv, const regnode *o)
8965 RXi_GET_DECL(prog,progi);
8966 GET_RE_DEBUG_FLAGS_DECL;
8968 PERL_ARGS_ASSERT_REGPROP;
8970 sv_setpvn(sv, "", 0);
8972 if (OP(o) > REGNODE_MAX) /* regnode.type is unsigned */
8973 /* It would be nice to FAIL() here, but this may be called from
8974 regexec.c, and it would be hard to supply pRExC_state. */
8975 Perl_croak(aTHX_ "Corrupted regexp opcode %d > %d", (int)OP(o), (int)REGNODE_MAX);
8976 sv_catpv(sv, PL_reg_name[OP(o)]); /* Take off const! */
8978 k = PL_regkind[OP(o)];
8982 /* Using is_utf8_string() (via PERL_PV_UNI_DETECT)
8983 * is a crude hack but it may be the best for now since
8984 * we have no flag "this EXACTish node was UTF-8"
8986 pv_pretty(sv, STRING(o), STR_LEN(o), 60, PL_colors[0], PL_colors[1],
8987 PERL_PV_ESCAPE_UNI_DETECT |
8988 PERL_PV_PRETTY_ELLIPSES |
8989 PERL_PV_PRETTY_LTGT |
8990 PERL_PV_PRETTY_NOCLEAR
8992 } else if (k == TRIE) {
8993 /* print the details of the trie in dumpuntil instead, as
8994 * progi->data isn't available here */
8995 const char op = OP(o);
8996 const U32 n = ARG(o);
8997 const reg_ac_data * const ac = IS_TRIE_AC(op) ?
8998 (reg_ac_data *)progi->data->data[n] :
9000 const reg_trie_data * const trie
9001 = (reg_trie_data*)progi->data->data[!IS_TRIE_AC(op) ? n : ac->trie];
9003 Perl_sv_catpvf(aTHX_ sv, "-%s",PL_reg_name[o->flags]);
9004 DEBUG_TRIE_COMPILE_r(
9005 Perl_sv_catpvf(aTHX_ sv,
9006 "<S:%"UVuf"/%"IVdf" W:%"UVuf" L:%"UVuf"/%"UVuf" C:%"UVuf"/%"UVuf">",
9007 (UV)trie->startstate,
9008 (IV)trie->statecount-1, /* -1 because of the unused 0 element */
9009 (UV)trie->wordcount,
9012 (UV)TRIE_CHARCOUNT(trie),
9013 (UV)trie->uniquecharcount
9016 if ( IS_ANYOF_TRIE(op) || trie->bitmap ) {
9018 int rangestart = -1;
9019 U8* bitmap = IS_ANYOF_TRIE(op) ? (U8*)ANYOF_BITMAP(o) : (U8*)TRIE_BITMAP(trie);
9021 for (i = 0; i <= 256; i++) {
9022 if (i < 256 && BITMAP_TEST(bitmap,i)) {
9023 if (rangestart == -1)
9025 } else if (rangestart != -1) {
9026 if (i <= rangestart + 3)
9027 for (; rangestart < i; rangestart++)
9028 put_byte(sv, rangestart);
9030 put_byte(sv, rangestart);
9032 put_byte(sv, i - 1);
9040 } else if (k == CURLY) {
9041 if (OP(o) == CURLYM || OP(o) == CURLYN || OP(o) == CURLYX)
9042 Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* Parenth number */
9043 Perl_sv_catpvf(aTHX_ sv, " {%d,%d}", ARG1(o), ARG2(o));
9045 else if (k == WHILEM && o->flags) /* Ordinal/of */
9046 Perl_sv_catpvf(aTHX_ sv, "[%d/%d]", o->flags & 0xf, o->flags>>4);
9047 else if (k == REF || k == OPEN || k == CLOSE || k == GROUPP || OP(o)==ACCEPT) {
9048 Perl_sv_catpvf(aTHX_ sv, "%d", (int)ARG(o)); /* Parenth number */
9049 if ( RXp_PAREN_NAMES(prog) ) {
9050 if ( k != REF || OP(o) < NREF) {
9051 AV *list= (AV *)progi->data->data[progi->name_list_idx];
9052 SV **name= av_fetch(list, ARG(o), 0 );
9054 Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
9057 AV *list= (AV *)progi->data->data[ progi->name_list_idx ];
9058 SV *sv_dat=(SV*)progi->data->data[ ARG( o ) ];
9059 I32 *nums=(I32*)SvPVX(sv_dat);
9060 SV **name= av_fetch(list, nums[0], 0 );
9063 for ( n=0; n<SvIVX(sv_dat); n++ ) {
9064 Perl_sv_catpvf(aTHX_ sv, "%s%"IVdf,
9065 (n ? "," : ""), (IV)nums[n]);
9067 Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
9071 } else if (k == GOSUB)
9072 Perl_sv_catpvf(aTHX_ sv, "%d[%+d]", (int)ARG(o),(int)ARG2L(o)); /* Paren and offset */
9073 else if (k == VERB) {
9075 Perl_sv_catpvf(aTHX_ sv, ":%"SVf,
9076 SVfARG((SV*)progi->data->data[ ARG( o ) ]));
9077 } else if (k == LOGICAL)
9078 Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* 2: embedded, otherwise 1 */
9079 else if (k == FOLDCHAR)
9080 Perl_sv_catpvf(aTHX_ sv, "[0x%"UVXf"]", PTR2UV(ARG(o)) );
9081 else if (k == ANYOF) {
9082 int i, rangestart = -1;
9083 const U8 flags = ANYOF_FLAGS(o);
9085 /* Should be synchronized with * ANYOF_ #xdefines in regcomp.h */
9086 static const char * const anyofs[] = {
9119 if (flags & ANYOF_LOCALE)
9120 sv_catpvs(sv, "{loc}");
9121 if (flags & ANYOF_FOLD)
9122 sv_catpvs(sv, "{i}");
9123 Perl_sv_catpvf(aTHX_ sv, "[%s", PL_colors[0]);
9124 if (flags & ANYOF_INVERT)
9126 for (i = 0; i <= 256; i++) {
9127 if (i < 256 && ANYOF_BITMAP_TEST(o,i)) {
9128 if (rangestart == -1)
9130 } else if (rangestart != -1) {
9131 if (i <= rangestart + 3)
9132 for (; rangestart < i; rangestart++)
9133 put_byte(sv, rangestart);
9135 put_byte(sv, rangestart);
9137 put_byte(sv, i - 1);
9143 if (o->flags & ANYOF_CLASS)
9144 for (i = 0; i < (int)(sizeof(anyofs)/sizeof(char*)); i++)
9145 if (ANYOF_CLASS_TEST(o,i))
9146 sv_catpv(sv, anyofs[i]);
9148 if (flags & ANYOF_UNICODE)
9149 sv_catpvs(sv, "{unicode}");
9150 else if (flags & ANYOF_UNICODE_ALL)
9151 sv_catpvs(sv, "{unicode_all}");
9155 SV * const sw = regclass_swash(prog, o, FALSE, &lv, 0);
9159 U8 s[UTF8_MAXBYTES_CASE+1];
9161 for (i = 0; i <= 256; i++) { /* just the first 256 */
9162 uvchr_to_utf8(s, i);
9164 if (i < 256 && swash_fetch(sw, s, TRUE)) {
9165 if (rangestart == -1)
9167 } else if (rangestart != -1) {
9168 if (i <= rangestart + 3)
9169 for (; rangestart < i; rangestart++) {
9170 const U8 * const e = uvchr_to_utf8(s,rangestart);
9172 for(p = s; p < e; p++)
9176 const U8 *e = uvchr_to_utf8(s,rangestart);
9178 for (p = s; p < e; p++)
9181 e = uvchr_to_utf8(s, i-1);
9182 for (p = s; p < e; p++)
9189 sv_catpvs(sv, "..."); /* et cetera */
9193 char *s = savesvpv(lv);
9194 char * const origs = s;
9196 while (*s && *s != '\n')
9200 const char * const t = ++s;
9218 Perl_sv_catpvf(aTHX_ sv, "%s]", PL_colors[1]);
9220 else if (k == BRANCHJ && (OP(o) == UNLESSM || OP(o) == IFMATCH))
9221 Perl_sv_catpvf(aTHX_ sv, "[%d]", -(o->flags));
9223 PERL_UNUSED_CONTEXT;
9224 PERL_UNUSED_ARG(sv);
9226 PERL_UNUSED_ARG(prog);
9227 #endif /* DEBUGGING */
9231 Perl_re_intuit_string(pTHX_ REGEXP * const r)
9232 { /* Assume that RE_INTUIT is set */
9234 struct regexp *const prog = (struct regexp *)SvANY(r);
9235 GET_RE_DEBUG_FLAGS_DECL;
9237 PERL_ARGS_ASSERT_RE_INTUIT_STRING;
9238 PERL_UNUSED_CONTEXT;
9242 const char * const s = SvPV_nolen_const(prog->check_substr
9243 ? prog->check_substr : prog->check_utf8);
9245 if (!PL_colorset) reginitcolors();
9246 PerlIO_printf(Perl_debug_log,
9247 "%sUsing REx %ssubstr:%s \"%s%.60s%s%s\"\n",
9249 prog->check_substr ? "" : "utf8 ",
9250 PL_colors[5],PL_colors[0],
9253 (strlen(s) > 60 ? "..." : ""));
9256 return prog->check_substr ? prog->check_substr : prog->check_utf8;
9262 handles refcounting and freeing the perl core regexp structure. When
9263 it is necessary to actually free the structure the first thing it
9264 does is call the 'free' method of the regexp_engine associated to to
9265 the regexp, allowing the handling of the void *pprivate; member
9266 first. (This routine is not overridable by extensions, which is why
9267 the extensions free is called first.)
9269 See regdupe and regdupe_internal if you change anything here.
9271 #ifndef PERL_IN_XSUB_RE
9273 Perl_pregfree(pTHX_ REGEXP *r)
9279 Perl_pregfree2(pTHX_ REGEXP *rx)
9282 struct regexp *const r = (struct regexp *)SvANY(rx);
9283 GET_RE_DEBUG_FLAGS_DECL;
9285 PERL_ARGS_ASSERT_PREGFREE2;
9288 ReREFCNT_dec(r->mother_re);
9290 CALLREGFREE_PVT(rx); /* free the private data */
9291 if (RXp_PAREN_NAMES(r))
9292 SvREFCNT_dec(RXp_PAREN_NAMES(r));
9295 if (r->anchored_substr)
9296 SvREFCNT_dec(r->anchored_substr);
9297 if (r->anchored_utf8)
9298 SvREFCNT_dec(r->anchored_utf8);
9299 if (r->float_substr)
9300 SvREFCNT_dec(r->float_substr);
9302 SvREFCNT_dec(r->float_utf8);
9303 Safefree(r->substrs);
9305 RX_MATCH_COPY_FREE(rx);
9306 #ifdef PERL_OLD_COPY_ON_WRITE
9308 SvREFCNT_dec(r->saved_copy);
9316 This is a hacky workaround to the structural issue of match results
9317 being stored in the regexp structure which is in turn stored in
9318 PL_curpm/PL_reg_curpm. The problem is that due to qr// the pattern
9319 could be PL_curpm in multiple contexts, and could require multiple
9320 result sets being associated with the pattern simultaneously, such
9321 as when doing a recursive match with (??{$qr})
9323 The solution is to make a lightweight copy of the regexp structure
9324 when a qr// is returned from the code executed by (??{$qr}) this
9325 lightweight copy doesnt actually own any of its data except for
9326 the starp/end and the actual regexp structure itself.
9332 Perl_reg_temp_copy (pTHX_ REGEXP *rx)
9334 REGEXP *ret_x = (REGEXP*) newSV_type(SVt_REGEXP);
9335 struct regexp *ret = (struct regexp *)SvANY(ret_x);
9336 struct regexp *const r = (struct regexp *)SvANY(rx);
9337 register const I32 npar = r->nparens+1;
9339 PERL_ARGS_ASSERT_REG_TEMP_COPY;
9341 (void)ReREFCNT_inc(rx);
9342 /* We can take advantage of the existing "copied buffer" mechanism in SVs
9343 by pointing directly at the buffer, but flagging that the allocated
9344 space in the copy is zero. As we've just done a struct copy, it's now
9345 a case of zero-ing that, rather than copying the current length. */
9346 SvPV_set(ret_x, RX_WRAPPED(rx));
9347 SvFLAGS(ret_x) |= SvFLAGS(rx) & (SVf_POK|SVp_POK|SVf_UTF8);
9348 StructCopy(&(r->xpv_cur), &(ret->xpv_cur), struct regexp_allocated);
9349 SvLEN_set(ret_x, 0);
9350 Newx(ret->offs, npar, regexp_paren_pair);
9351 Copy(r->offs, ret->offs, npar, regexp_paren_pair);
9353 Newx(ret->substrs, 1, struct reg_substr_data);
9354 StructCopy(r->substrs, ret->substrs, struct reg_substr_data);
9356 SvREFCNT_inc_void(ret->anchored_substr);
9357 SvREFCNT_inc_void(ret->anchored_utf8);
9358 SvREFCNT_inc_void(ret->float_substr);
9359 SvREFCNT_inc_void(ret->float_utf8);
9361 /* check_substr and check_utf8, if non-NULL, point to either their
9362 anchored or float namesakes, and don't hold a second reference. */
9364 RX_MATCH_COPIED_off(ret_x);
9365 #ifdef PERL_OLD_COPY_ON_WRITE
9366 ret->saved_copy = NULL;
9368 ret->mother_re = rx;
9375 /* regfree_internal()
9377 Free the private data in a regexp. This is overloadable by
9378 extensions. Perl takes care of the regexp structure in pregfree(),
9379 this covers the *pprivate pointer which technically perldoesnt
9380 know about, however of course we have to handle the
9381 regexp_internal structure when no extension is in use.
9383 Note this is called before freeing anything in the regexp
9388 Perl_regfree_internal(pTHX_ REGEXP * const rx)
9391 struct regexp *const r = (struct regexp *)SvANY(rx);
9393 GET_RE_DEBUG_FLAGS_DECL;
9395 PERL_ARGS_ASSERT_REGFREE_INTERNAL;
9401 SV *dsv= sv_newmortal();
9402 RE_PV_QUOTED_DECL(s, RX_UTF8(rx),
9403 dsv, RX_PRECOMP(rx), RX_PRELEN(rx), 60);
9404 PerlIO_printf(Perl_debug_log,"%sFreeing REx:%s %s\n",
9405 PL_colors[4],PL_colors[5],s);
9408 #ifdef RE_TRACK_PATTERN_OFFSETS
9410 Safefree(ri->u.offsets); /* 20010421 MJD */
9413 int n = ri->data->count;
9414 PAD* new_comppad = NULL;
9419 /* If you add a ->what type here, update the comment in regcomp.h */
9420 switch (ri->data->what[n]) {
9424 SvREFCNT_dec((SV*)ri->data->data[n]);
9427 Safefree(ri->data->data[n]);
9430 new_comppad = (AV*)ri->data->data[n];
9433 if (new_comppad == NULL)
9434 Perl_croak(aTHX_ "panic: pregfree comppad");
9435 PAD_SAVE_LOCAL(old_comppad,
9436 /* Watch out for global destruction's random ordering. */
9437 (SvTYPE(new_comppad) == SVt_PVAV) ? new_comppad : NULL
9440 refcnt = OpREFCNT_dec((OP_4tree*)ri->data->data[n]);
9443 op_free((OP_4tree*)ri->data->data[n]);
9445 PAD_RESTORE_LOCAL(old_comppad);
9446 SvREFCNT_dec((SV*)new_comppad);
9452 { /* Aho Corasick add-on structure for a trie node.
9453 Used in stclass optimization only */
9455 reg_ac_data *aho=(reg_ac_data*)ri->data->data[n];
9457 refcount = --aho->refcount;
9460 PerlMemShared_free(aho->states);
9461 PerlMemShared_free(aho->fail);
9462 /* do this last!!!! */
9463 PerlMemShared_free(ri->data->data[n]);
9464 PerlMemShared_free(ri->regstclass);
9470 /* trie structure. */
9472 reg_trie_data *trie=(reg_trie_data*)ri->data->data[n];
9474 refcount = --trie->refcount;
9477 PerlMemShared_free(trie->charmap);
9478 PerlMemShared_free(trie->states);
9479 PerlMemShared_free(trie->trans);
9481 PerlMemShared_free(trie->bitmap);
9483 PerlMemShared_free(trie->wordlen);
9485 PerlMemShared_free(trie->jump);
9487 PerlMemShared_free(trie->nextword);
9488 /* do this last!!!! */
9489 PerlMemShared_free(ri->data->data[n]);
9494 Perl_croak(aTHX_ "panic: regfree data code '%c'", ri->data->what[n]);
9497 Safefree(ri->data->what);
9504 #define sv_dup_inc(s,t) SvREFCNT_inc(sv_dup(s,t))
9505 #define av_dup_inc(s,t) (AV*)SvREFCNT_inc(sv_dup((SV*)s,t))
9506 #define hv_dup_inc(s,t) (HV*)SvREFCNT_inc(sv_dup((SV*)s,t))
9507 #define SAVEPVN(p,n) ((p) ? savepvn(p,n) : NULL)
9510 re_dup - duplicate a regexp.
9512 This routine is expected to clone a given regexp structure. It is not
9513 compiler under USE_ITHREADS.
9515 After all of the core data stored in struct regexp is duplicated
9516 the regexp_engine.dupe method is used to copy any private data
9517 stored in the *pprivate pointer. This allows extensions to handle
9518 any duplication it needs to do.
9520 See pregfree() and regfree_internal() if you change anything here.
9522 #if defined(USE_ITHREADS)
9523 #ifndef PERL_IN_XSUB_RE
9525 Perl_re_dup_guts(pTHX_ const REGEXP *sstr, REGEXP *dstr, CLONE_PARAMS *param)
9529 const struct regexp *r = (const struct regexp *)SvANY(sstr);
9530 struct regexp *ret = (struct regexp *)SvANY(dstr);
9532 PERL_ARGS_ASSERT_RE_DUP_GUTS;
9534 npar = r->nparens+1;
9535 Newx(ret->offs, npar, regexp_paren_pair);
9536 Copy(r->offs, ret->offs, npar, regexp_paren_pair);
9538 /* no need to copy these */
9539 Newx(ret->swap, npar, regexp_paren_pair);
9543 /* Do it this way to avoid reading from *r after the StructCopy().
9544 That way, if any of the sv_dup_inc()s dislodge *r from the L1
9545 cache, it doesn't matter. */
9546 const bool anchored = r->check_substr
9547 ? r->check_substr == r->anchored_substr
9548 : r->check_utf8 == r->anchored_utf8;
9549 Newx(ret->substrs, 1, struct reg_substr_data);
9550 StructCopy(r->substrs, ret->substrs, struct reg_substr_data);
9552 ret->anchored_substr = sv_dup_inc(ret->anchored_substr, param);
9553 ret->anchored_utf8 = sv_dup_inc(ret->anchored_utf8, param);
9554 ret->float_substr = sv_dup_inc(ret->float_substr, param);
9555 ret->float_utf8 = sv_dup_inc(ret->float_utf8, param);
9557 /* check_substr and check_utf8, if non-NULL, point to either their
9558 anchored or float namesakes, and don't hold a second reference. */
9560 if (ret->check_substr) {
9562 assert(r->check_utf8 == r->anchored_utf8);
9563 ret->check_substr = ret->anchored_substr;
9564 ret->check_utf8 = ret->anchored_utf8;
9566 assert(r->check_substr == r->float_substr);
9567 assert(r->check_utf8 == r->float_utf8);
9568 ret->check_substr = ret->float_substr;
9569 ret->check_utf8 = ret->float_utf8;
9571 } else if (ret->check_utf8) {
9573 ret->check_utf8 = ret->anchored_utf8;
9575 ret->check_utf8 = ret->float_utf8;
9580 RXp_PAREN_NAMES(ret) = hv_dup_inc(RXp_PAREN_NAMES(ret), param);
9583 RXi_SET(ret,CALLREGDUPE_PVT(dstr,param));
9585 if (RX_MATCH_COPIED(dstr))
9586 ret->subbeg = SAVEPVN(ret->subbeg, ret->sublen);
9589 #ifdef PERL_OLD_COPY_ON_WRITE
9590 ret->saved_copy = NULL;
9593 ret->mother_re = NULL;
9596 #endif /* PERL_IN_XSUB_RE */
9601 This is the internal complement to regdupe() which is used to copy
9602 the structure pointed to by the *pprivate pointer in the regexp.
9603 This is the core version of the extension overridable cloning hook.
9604 The regexp structure being duplicated will be copied by perl prior
9605 to this and will be provided as the regexp *r argument, however
9606 with the /old/ structures pprivate pointer value. Thus this routine
9607 may override any copying normally done by perl.
9609 It returns a pointer to the new regexp_internal structure.
9613 Perl_regdupe_internal(pTHX_ REGEXP * const rx, CLONE_PARAMS *param)
9616 struct regexp *const r = (struct regexp *)SvANY(rx);
9617 regexp_internal *reti;
9621 PERL_ARGS_ASSERT_REGDUPE_INTERNAL;
9623 npar = r->nparens+1;
9626 Newxc(reti, sizeof(regexp_internal) + (len+1)*sizeof(regnode), char, regexp_internal);
9627 Copy(ri->program, reti->program, len+1, regnode);
9630 reti->regstclass = NULL;
9634 const int count = ri->data->count;
9637 Newxc(d, sizeof(struct reg_data) + count*sizeof(void *),
9638 char, struct reg_data);
9639 Newx(d->what, count, U8);
9642 for (i = 0; i < count; i++) {
9643 d->what[i] = ri->data->what[i];
9644 switch (d->what[i]) {
9645 /* legal options are one of: sSfpontTu
9646 see also regcomp.h and pregfree() */
9649 case 'p': /* actually an AV, but the dup function is identical. */
9650 case 'u': /* actually an HV, but the dup function is identical. */
9651 d->data[i] = sv_dup_inc((SV *)ri->data->data[i], param);
9654 /* This is cheating. */
9655 Newx(d->data[i], 1, struct regnode_charclass_class);
9656 StructCopy(ri->data->data[i], d->data[i],
9657 struct regnode_charclass_class);
9658 reti->regstclass = (regnode*)d->data[i];
9661 /* Compiled op trees are readonly and in shared memory,
9662 and can thus be shared without duplication. */
9664 d->data[i] = (void*)OpREFCNT_inc((OP*)ri->data->data[i]);
9668 /* Trie stclasses are readonly and can thus be shared
9669 * without duplication. We free the stclass in pregfree
9670 * when the corresponding reg_ac_data struct is freed.
9672 reti->regstclass= ri->regstclass;
9676 ((reg_trie_data*)ri->data->data[i])->refcount++;
9680 d->data[i] = ri->data->data[i];
9683 Perl_croak(aTHX_ "panic: re_dup unknown data code '%c'", ri->data->what[i]);
9692 reti->name_list_idx = ri->name_list_idx;
9694 #ifdef RE_TRACK_PATTERN_OFFSETS
9695 if (ri->u.offsets) {
9696 Newx(reti->u.offsets, 2*len+1, U32);
9697 Copy(ri->u.offsets, reti->u.offsets, 2*len+1, U32);
9700 SetProgLen(reti,len);
9706 #endif /* USE_ITHREADS */
9708 #ifndef PERL_IN_XSUB_RE
9711 - regnext - dig the "next" pointer out of a node
9714 Perl_regnext(pTHX_ register regnode *p)
9717 register I32 offset;
9722 offset = (reg_off_by_arg[OP(p)] ? ARG(p) : NEXT_OFF(p));
9731 S_re_croak2(pTHX_ const char* pat1,const char* pat2,...)
9734 STRLEN l1 = strlen(pat1);
9735 STRLEN l2 = strlen(pat2);
9738 const char *message;
9740 PERL_ARGS_ASSERT_RE_CROAK2;
9746 Copy(pat1, buf, l1 , char);
9747 Copy(pat2, buf + l1, l2 , char);
9748 buf[l1 + l2] = '\n';
9749 buf[l1 + l2 + 1] = '\0';
9751 /* ANSI variant takes additional second argument */
9752 va_start(args, pat2);
9756 msv = vmess(buf, &args);
9758 message = SvPV_const(msv,l1);
9761 Copy(message, buf, l1 , char);
9762 buf[l1-1] = '\0'; /* Overwrite \n */
9763 Perl_croak(aTHX_ "%s", buf);
9766 /* XXX Here's a total kludge. But we need to re-enter for swash routines. */
9768 #ifndef PERL_IN_XSUB_RE
9770 Perl_save_re_context(pTHX)
9774 struct re_save_state *state;
9776 SAVEVPTR(PL_curcop);
9777 SSGROW(SAVESTACK_ALLOC_FOR_RE_SAVE_STATE + 1);
9779 state = (struct re_save_state *)(PL_savestack + PL_savestack_ix);
9780 PL_savestack_ix += SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
9781 SSPUSHINT(SAVEt_RE_STATE);
9783 Copy(&PL_reg_state, state, 1, struct re_save_state);
9785 PL_reg_start_tmp = 0;
9786 PL_reg_start_tmpl = 0;
9787 PL_reg_oldsaved = NULL;
9788 PL_reg_oldsavedlen = 0;
9790 PL_reg_leftiter = 0;
9791 PL_reg_poscache = NULL;
9792 PL_reg_poscache_size = 0;
9793 #ifdef PERL_OLD_COPY_ON_WRITE
9797 /* Save $1..$n (#18107: UTF-8 s/(\w+)/uc($1)/e); AMS 20021106. */
9799 const REGEXP * const rx = PM_GETRE(PL_curpm);
9802 for (i = 1; i <= RX_NPARENS(rx); i++) {
9803 char digits[TYPE_CHARS(long)];
9804 const STRLEN len = my_snprintf(digits, sizeof(digits), "%lu", (long)i);
9805 GV *const *const gvp
9806 = (GV**)hv_fetch(PL_defstash, digits, len, 0);
9809 GV * const gv = *gvp;
9810 if (SvTYPE(gv) == SVt_PVGV && GvSV(gv))
9820 clear_re(pTHX_ void *r)
9823 ReREFCNT_dec((REGEXP *)r);
9829 S_put_byte(pTHX_ SV *sv, int c)
9831 PERL_ARGS_ASSERT_PUT_BYTE;
9833 /* Our definition of isPRINT() ignores locales, so only bytes that are
9834 not part of UTF-8 are considered printable. I assume that the same
9835 holds for UTF-EBCDIC.
9836 Also, code point 255 is not printable in either (it's E0 in EBCDIC,
9837 which Wikipedia says:
9839 EO, or Eight Ones, is an 8-bit EBCDIC character code represented as all
9840 ones (binary 1111 1111, hexadecimal FF). It is similar, but not
9841 identical, to the ASCII delete (DEL) or rubout control character.
9842 ) So the old condition can be simplified to !isPRINT(c) */
9844 Perl_sv_catpvf(aTHX_ sv, "\\%o", c);
9846 const char string = c;
9847 if (c == '-' || c == ']' || c == '\\' || c == '^')
9848 sv_catpvs(sv, "\\");
9849 sv_catpvn(sv, &string, 1);
9854 #define CLEAR_OPTSTART \
9855 if (optstart) STMT_START { \
9856 DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log, " (%"IVdf" nodes)\n", (IV)(node - optstart))); \
9860 #define DUMPUNTIL(b,e) CLEAR_OPTSTART; node=dumpuntil(r,start,(b),(e),last,sv,indent+1,depth+1);
9862 STATIC const regnode *
9863 S_dumpuntil(pTHX_ const regexp *r, const regnode *start, const regnode *node,
9864 const regnode *last, const regnode *plast,
9865 SV* sv, I32 indent, U32 depth)
9868 register U8 op = PSEUDO; /* Arbitrary non-END op. */
9869 register const regnode *next;
9870 const regnode *optstart= NULL;
9873 GET_RE_DEBUG_FLAGS_DECL;
9875 PERL_ARGS_ASSERT_DUMPUNTIL;
9877 #ifdef DEBUG_DUMPUNTIL
9878 PerlIO_printf(Perl_debug_log, "--- %d : %d - %d - %d\n",indent,node-start,
9879 last ? last-start : 0,plast ? plast-start : 0);
9882 if (plast && plast < last)
9885 while (PL_regkind[op] != END && (!last || node < last)) {
9886 /* While that wasn't END last time... */
9889 if (op == CLOSE || op == WHILEM)
9891 next = regnext((regnode *)node);
9894 if (OP(node) == OPTIMIZED) {
9895 if (!optstart && RE_DEBUG_FLAG(RE_DEBUG_COMPILE_OPTIMISE))
9902 regprop(r, sv, node);
9903 PerlIO_printf(Perl_debug_log, "%4"IVdf":%*s%s", (IV)(node - start),
9904 (int)(2*indent + 1), "", SvPVX_const(sv));
9906 if (OP(node) != OPTIMIZED) {
9907 if (next == NULL) /* Next ptr. */
9908 PerlIO_printf(Perl_debug_log, " (0)");
9909 else if (PL_regkind[(U8)op] == BRANCH && PL_regkind[OP(next)] != BRANCH )
9910 PerlIO_printf(Perl_debug_log, " (FAIL)");
9912 PerlIO_printf(Perl_debug_log, " (%"IVdf")", (IV)(next - start));
9913 (void)PerlIO_putc(Perl_debug_log, '\n');
9917 if (PL_regkind[(U8)op] == BRANCHJ) {
9920 register const regnode *nnode = (OP(next) == LONGJMP
9921 ? regnext((regnode *)next)
9923 if (last && nnode > last)
9925 DUMPUNTIL(NEXTOPER(NEXTOPER(node)), nnode);
9928 else if (PL_regkind[(U8)op] == BRANCH) {
9930 DUMPUNTIL(NEXTOPER(node), next);
9932 else if ( PL_regkind[(U8)op] == TRIE ) {
9933 const regnode *this_trie = node;
9934 const char op = OP(node);
9935 const U32 n = ARG(node);
9936 const reg_ac_data * const ac = op>=AHOCORASICK ?
9937 (reg_ac_data *)ri->data->data[n] :
9939 const reg_trie_data * const trie =
9940 (reg_trie_data*)ri->data->data[op<AHOCORASICK ? n : ac->trie];
9942 AV *const trie_words = (AV *) ri->data->data[n + TRIE_WORDS_OFFSET];
9944 const regnode *nextbranch= NULL;
9946 sv_setpvn(sv, "", 0);
9947 for (word_idx= 0; word_idx < (I32)trie->wordcount; word_idx++) {
9948 SV ** const elem_ptr = av_fetch(trie_words,word_idx,0);
9950 PerlIO_printf(Perl_debug_log, "%*s%s ",
9951 (int)(2*(indent+3)), "",
9952 elem_ptr ? pv_pretty(sv, SvPV_nolen_const(*elem_ptr), SvCUR(*elem_ptr), 60,
9953 PL_colors[0], PL_colors[1],
9954 (SvUTF8(*elem_ptr) ? PERL_PV_ESCAPE_UNI : 0) |
9955 PERL_PV_PRETTY_ELLIPSES |
9961 U16 dist= trie->jump[word_idx+1];
9962 PerlIO_printf(Perl_debug_log, "(%"UVuf")\n",
9963 (UV)((dist ? this_trie + dist : next) - start));
9966 nextbranch= this_trie + trie->jump[0];
9967 DUMPUNTIL(this_trie + dist, nextbranch);
9969 if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
9970 nextbranch= regnext((regnode *)nextbranch);
9972 PerlIO_printf(Perl_debug_log, "\n");
9975 if (last && next > last)
9980 else if ( op == CURLY ) { /* "next" might be very big: optimizer */
9981 DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS,
9982 NEXTOPER(node) + EXTRA_STEP_2ARGS + 1);
9984 else if (PL_regkind[(U8)op] == CURLY && op != CURLYX) {
9986 DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS, next);
9988 else if ( op == PLUS || op == STAR) {
9989 DUMPUNTIL(NEXTOPER(node), NEXTOPER(node) + 1);
9991 else if (op == ANYOF) {
9992 /* arglen 1 + class block */
9993 node += 1 + ((ANYOF_FLAGS(node) & ANYOF_LARGE)
9994 ? ANYOF_CLASS_SKIP : ANYOF_SKIP);
9995 node = NEXTOPER(node);
9997 else if (PL_regkind[(U8)op] == EXACT) {
9998 /* Literal string, where present. */
9999 node += NODE_SZ_STR(node) - 1;
10000 node = NEXTOPER(node);
10003 node = NEXTOPER(node);
10004 node += regarglen[(U8)op];
10006 if (op == CURLYX || op == OPEN)
10010 #ifdef DEBUG_DUMPUNTIL
10011 PerlIO_printf(Perl_debug_log, "--- %d\n", (int)indent);
10016 #endif /* DEBUGGING */
10020 * c-indentation-style: bsd
10021 * c-basic-offset: 4
10022 * indent-tabs-mode: t
10025 * ex: set ts=8 sts=4 sw=4 noet:
projects / p5sagit/p5-mst-13.2.git / blob