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; /* perl core regexp structure */
106 regexp_internal *rxi; /* internal data for regexp object pprivate field */
107 char *start; /* Start of input for compile */
108 char *end; /* End of input for compile */
109 char *parse; /* Input-scan pointer. */
110 I32 whilem_seen; /* number of WHILEM in this expr */
111 regnode *emit_start; /* Start of emitted-code area */
112 regnode *emit_bound; /* First regnode outside of the allocated space */
113 regnode *emit; /* Code-emit pointer; ®dummy = don't = compiling */
114 I32 naughty; /* How bad is this pattern? */
115 I32 sawback; /* Did we see \1, ...? */
117 I32 size; /* Code size. */
118 I32 npar; /* Capture buffer count, (OPEN). */
119 I32 cpar; /* Capture buffer count, (CLOSE). */
120 I32 nestroot; /* root parens we are in - used by accept */
124 regnode **open_parens; /* pointers to open parens */
125 regnode **close_parens; /* pointers to close parens */
126 regnode *opend; /* END node in program */
127 I32 utf8; /* whether the pattern is utf8 or not */
128 I32 orig_utf8; /* whether the pattern was originally in utf8 */
129 /* XXX use this for future optimisation of case
130 * where pattern must be upgraded to utf8. */
131 HV *charnames; /* cache of named sequences */
132 HV *paren_names; /* Paren names */
134 regnode **recurse; /* Recurse regops */
135 I32 recurse_count; /* Number of recurse regops */
137 char *starttry; /* -Dr: where regtry was called. */
138 #define RExC_starttry (pRExC_state->starttry)
141 const char *lastparse;
143 AV *paren_name_list; /* idx -> name */
144 #define RExC_lastparse (pRExC_state->lastparse)
145 #define RExC_lastnum (pRExC_state->lastnum)
146 #define RExC_paren_name_list (pRExC_state->paren_name_list)
150 #define RExC_flags (pRExC_state->flags)
151 #define RExC_precomp (pRExC_state->precomp)
152 #define RExC_rx (pRExC_state->rx)
153 #define RExC_rxi (pRExC_state->rxi)
154 #define RExC_start (pRExC_state->start)
155 #define RExC_end (pRExC_state->end)
156 #define RExC_parse (pRExC_state->parse)
157 #define RExC_whilem_seen (pRExC_state->whilem_seen)
158 #ifdef RE_TRACK_PATTERN_OFFSETS
159 #define RExC_offsets (pRExC_state->rxi->u.offsets) /* I am not like the others */
161 #define RExC_emit (pRExC_state->emit)
162 #define RExC_emit_start (pRExC_state->emit_start)
163 #define RExC_emit_bound (pRExC_state->emit_bound)
164 #define RExC_naughty (pRExC_state->naughty)
165 #define RExC_sawback (pRExC_state->sawback)
166 #define RExC_seen (pRExC_state->seen)
167 #define RExC_size (pRExC_state->size)
168 #define RExC_npar (pRExC_state->npar)
169 #define RExC_nestroot (pRExC_state->nestroot)
170 #define RExC_extralen (pRExC_state->extralen)
171 #define RExC_seen_zerolen (pRExC_state->seen_zerolen)
172 #define RExC_seen_evals (pRExC_state->seen_evals)
173 #define RExC_utf8 (pRExC_state->utf8)
174 #define RExC_orig_utf8 (pRExC_state->orig_utf8)
175 #define RExC_charnames (pRExC_state->charnames)
176 #define RExC_open_parens (pRExC_state->open_parens)
177 #define RExC_close_parens (pRExC_state->close_parens)
178 #define RExC_opend (pRExC_state->opend)
179 #define RExC_paren_names (pRExC_state->paren_names)
180 #define RExC_recurse (pRExC_state->recurse)
181 #define RExC_recurse_count (pRExC_state->recurse_count)
184 #define ISMULT1(c) ((c) == '*' || (c) == '+' || (c) == '?')
185 #define ISMULT2(s) ((*s) == '*' || (*s) == '+' || (*s) == '?' || \
186 ((*s) == '{' && regcurly(s)))
189 #undef SPSTART /* dratted cpp namespace... */
192 * Flags to be passed up and down.
194 #define WORST 0 /* Worst case. */
195 #define HASWIDTH 0x01 /* Known to match non-null strings. */
196 #define SIMPLE 0x02 /* Simple enough to be STAR/PLUS operand. */
197 #define SPSTART 0x04 /* Starts with * or +. */
198 #define TRYAGAIN 0x08 /* Weeded out a declaration. */
199 #define POSTPONED 0x10 /* (?1),(?&name), (??{...}) or similar */
201 #define REG_NODE_NUM(x) ((x) ? (int)((x)-RExC_emit_start) : -1)
203 /* whether trie related optimizations are enabled */
204 #if PERL_ENABLE_EXTENDED_TRIE_OPTIMISATION
205 #define TRIE_STUDY_OPT
206 #define FULL_TRIE_STUDY
212 #define PBYTE(u8str,paren) ((U8*)(u8str))[(paren) >> 3]
213 #define PBITVAL(paren) (1 << ((paren) & 7))
214 #define PAREN_TEST(u8str,paren) ( PBYTE(u8str,paren) & PBITVAL(paren))
215 #define PAREN_SET(u8str,paren) PBYTE(u8str,paren) |= PBITVAL(paren)
216 #define PAREN_UNSET(u8str,paren) PBYTE(u8str,paren) &= (~PBITVAL(paren))
219 /* About scan_data_t.
221 During optimisation we recurse through the regexp program performing
222 various inplace (keyhole style) optimisations. In addition study_chunk
223 and scan_commit populate this data structure with information about
224 what strings MUST appear in the pattern. We look for the longest
225 string that must appear for at a fixed location, and we look for the
226 longest string that may appear at a floating location. So for instance
231 Both 'FOO' and 'A' are fixed strings. Both 'B' and 'BAR' are floating
232 strings (because they follow a .* construct). study_chunk will identify
233 both FOO and BAR as being the longest fixed and floating strings respectively.
235 The strings can be composites, for instance
239 will result in a composite fixed substring 'foo'.
241 For each string some basic information is maintained:
243 - offset or min_offset
244 This is the position the string must appear at, or not before.
245 It also implicitly (when combined with minlenp) tells us how many
246 character must match before the string we are searching.
247 Likewise when combined with minlenp and the length of the string
248 tells us how many characters must appear after the string we have
252 Only used for floating strings. This is the rightmost point that
253 the string can appear at. Ifset to I32 max it indicates that the
254 string can occur infinitely far to the right.
257 A pointer to the minimum length of the pattern that the string
258 was found inside. This is important as in the case of positive
259 lookahead or positive lookbehind we can have multiple patterns
264 The minimum length of the pattern overall is 3, the minimum length
265 of the lookahead part is 3, but the minimum length of the part that
266 will actually match is 1. So 'FOO's minimum length is 3, but the
267 minimum length for the F is 1. This is important as the minimum length
268 is used to determine offsets in front of and behind the string being
269 looked for. Since strings can be composites this is the length of the
270 pattern at the time it was commited with a scan_commit. Note that
271 the length is calculated by study_chunk, so that the minimum lengths
272 are not known until the full pattern has been compiled, thus the
273 pointer to the value.
277 In the case of lookbehind the string being searched for can be
278 offset past the start point of the final matching string.
279 If this value was just blithely removed from the min_offset it would
280 invalidate some of the calculations for how many chars must match
281 before or after (as they are derived from min_offset and minlen and
282 the length of the string being searched for).
283 When the final pattern is compiled and the data is moved from the
284 scan_data_t structure into the regexp structure the information
285 about lookbehind is factored in, with the information that would
286 have been lost precalculated in the end_shift field for the
289 The fields pos_min and pos_delta are used to store the minimum offset
290 and the delta to the maximum offset at the current point in the pattern.
294 typedef struct scan_data_t {
295 /*I32 len_min; unused */
296 /*I32 len_delta; unused */
300 I32 last_end; /* min value, <0 unless valid. */
303 SV **longest; /* Either &l_fixed, or &l_float. */
304 SV *longest_fixed; /* longest fixed string found in pattern */
305 I32 offset_fixed; /* offset where it starts */
306 I32 *minlen_fixed; /* pointer to the minlen relevent to the string */
307 I32 lookbehind_fixed; /* is the position of the string modfied by LB */
308 SV *longest_float; /* longest floating string found in pattern */
309 I32 offset_float_min; /* earliest point in string it can appear */
310 I32 offset_float_max; /* latest point in string it can appear */
311 I32 *minlen_float; /* pointer to the minlen relevent to the string */
312 I32 lookbehind_float; /* is the position of the string modified by LB */
316 struct regnode_charclass_class *start_class;
320 * Forward declarations for pregcomp()'s friends.
323 static const scan_data_t zero_scan_data =
324 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ,0};
326 #define SF_BEFORE_EOL (SF_BEFORE_SEOL|SF_BEFORE_MEOL)
327 #define SF_BEFORE_SEOL 0x0001
328 #define SF_BEFORE_MEOL 0x0002
329 #define SF_FIX_BEFORE_EOL (SF_FIX_BEFORE_SEOL|SF_FIX_BEFORE_MEOL)
330 #define SF_FL_BEFORE_EOL (SF_FL_BEFORE_SEOL|SF_FL_BEFORE_MEOL)
333 # define SF_FIX_SHIFT_EOL (0+2)
334 # define SF_FL_SHIFT_EOL (0+4)
336 # define SF_FIX_SHIFT_EOL (+2)
337 # define SF_FL_SHIFT_EOL (+4)
340 #define SF_FIX_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FIX_SHIFT_EOL)
341 #define SF_FIX_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FIX_SHIFT_EOL)
343 #define SF_FL_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FL_SHIFT_EOL)
344 #define SF_FL_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FL_SHIFT_EOL) /* 0x20 */
345 #define SF_IS_INF 0x0040
346 #define SF_HAS_PAR 0x0080
347 #define SF_IN_PAR 0x0100
348 #define SF_HAS_EVAL 0x0200
349 #define SCF_DO_SUBSTR 0x0400
350 #define SCF_DO_STCLASS_AND 0x0800
351 #define SCF_DO_STCLASS_OR 0x1000
352 #define SCF_DO_STCLASS (SCF_DO_STCLASS_AND|SCF_DO_STCLASS_OR)
353 #define SCF_WHILEM_VISITED_POS 0x2000
355 #define SCF_TRIE_RESTUDY 0x4000 /* Do restudy? */
356 #define SCF_SEEN_ACCEPT 0x8000
358 #define UTF (RExC_utf8 != 0)
359 #define LOC ((RExC_flags & RXf_PMf_LOCALE) != 0)
360 #define FOLD ((RExC_flags & RXf_PMf_FOLD) != 0)
362 #define OOB_UNICODE 12345678
363 #define OOB_NAMEDCLASS -1
365 #define CHR_SVLEN(sv) (UTF ? sv_len_utf8(sv) : SvCUR(sv))
366 #define CHR_DIST(a,b) (UTF ? utf8_distance(a,b) : a - b)
369 /* length of regex to show in messages that don't mark a position within */
370 #define RegexLengthToShowInErrorMessages 127
373 * If MARKER[12] are adjusted, be sure to adjust the constants at the top
374 * of t/op/regmesg.t, the tests in t/op/re_tests, and those in
375 * op/pragma/warn/regcomp.
377 #define MARKER1 "<-- HERE" /* marker as it appears in the description */
378 #define MARKER2 " <-- HERE " /* marker as it appears within the regex */
380 #define REPORT_LOCATION " in regex; marked by " MARKER1 " in m/%.*s" MARKER2 "%s/"
383 * Calls SAVEDESTRUCTOR_X if needed, then calls Perl_croak with the given
384 * arg. Show regex, up to a maximum length. If it's too long, chop and add
387 #define _FAIL(code) STMT_START { \
388 const char *ellipses = ""; \
389 IV len = RExC_end - RExC_precomp; \
392 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx); \
393 if (len > RegexLengthToShowInErrorMessages) { \
394 /* chop 10 shorter than the max, to ensure meaning of "..." */ \
395 len = RegexLengthToShowInErrorMessages - 10; \
401 #define FAIL(msg) _FAIL( \
402 Perl_croak(aTHX_ "%s in regex m/%.*s%s/", \
403 msg, (int)len, RExC_precomp, ellipses))
405 #define FAIL2(msg,arg) _FAIL( \
406 Perl_croak(aTHX_ msg " in regex m/%.*s%s/", \
407 arg, (int)len, RExC_precomp, ellipses))
410 * Simple_vFAIL -- like FAIL, but marks the current location in the scan
412 #define Simple_vFAIL(m) STMT_START { \
413 const IV offset = RExC_parse - RExC_precomp; \
414 Perl_croak(aTHX_ "%s" REPORT_LOCATION, \
415 m, (int)offset, RExC_precomp, RExC_precomp + offset); \
419 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL()
421 #define vFAIL(m) STMT_START { \
423 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx); \
428 * Like Simple_vFAIL(), but accepts two arguments.
430 #define Simple_vFAIL2(m,a1) STMT_START { \
431 const IV offset = RExC_parse - RExC_precomp; \
432 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, \
433 (int)offset, RExC_precomp, RExC_precomp + offset); \
437 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL2().
439 #define vFAIL2(m,a1) STMT_START { \
441 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx); \
442 Simple_vFAIL2(m, a1); \
447 * Like Simple_vFAIL(), but accepts three arguments.
449 #define Simple_vFAIL3(m, a1, a2) STMT_START { \
450 const IV offset = RExC_parse - RExC_precomp; \
451 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, \
452 (int)offset, RExC_precomp, RExC_precomp + offset); \
456 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL3().
458 #define vFAIL3(m,a1,a2) STMT_START { \
460 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx); \
461 Simple_vFAIL3(m, a1, a2); \
465 * Like Simple_vFAIL(), but accepts four arguments.
467 #define Simple_vFAIL4(m, a1, a2, a3) STMT_START { \
468 const IV offset = RExC_parse - RExC_precomp; \
469 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, a3, \
470 (int)offset, RExC_precomp, RExC_precomp + offset); \
473 #define vWARN(loc,m) STMT_START { \
474 const IV offset = loc - RExC_precomp; \
475 Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s" REPORT_LOCATION, \
476 m, (int)offset, RExC_precomp, RExC_precomp + offset); \
479 #define vWARNdep(loc,m) STMT_START { \
480 const IV offset = loc - RExC_precomp; \
481 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_REGEXP), \
482 "%s" REPORT_LOCATION, \
483 m, (int)offset, RExC_precomp, RExC_precomp + offset); \
487 #define vWARN2(loc, m, a1) STMT_START { \
488 const IV offset = loc - RExC_precomp; \
489 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
490 a1, (int)offset, RExC_precomp, RExC_precomp + offset); \
493 #define vWARN3(loc, m, a1, a2) STMT_START { \
494 const IV offset = loc - RExC_precomp; \
495 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
496 a1, a2, (int)offset, RExC_precomp, RExC_precomp + offset); \
499 #define vWARN4(loc, m, a1, a2, a3) STMT_START { \
500 const IV offset = loc - RExC_precomp; \
501 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
502 a1, a2, a3, (int)offset, RExC_precomp, RExC_precomp + offset); \
505 #define vWARN5(loc, m, a1, a2, a3, a4) STMT_START { \
506 const IV offset = loc - RExC_precomp; \
507 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
508 a1, a2, a3, a4, (int)offset, RExC_precomp, RExC_precomp + offset); \
512 /* Allow for side effects in s */
513 #define REGC(c,s) STMT_START { \
514 if (!SIZE_ONLY) *(s) = (c); else (void)(s); \
517 /* Macros for recording node offsets. 20001227 mjd@plover.com
518 * Nodes are numbered 1, 2, 3, 4. Node #n's position is recorded in
519 * element 2*n-1 of the array. Element #2n holds the byte length node #n.
520 * Element 0 holds the number n.
521 * Position is 1 indexed.
523 #ifndef RE_TRACK_PATTERN_OFFSETS
524 #define Set_Node_Offset_To_R(node,byte)
525 #define Set_Node_Offset(node,byte)
526 #define Set_Cur_Node_Offset
527 #define Set_Node_Length_To_R(node,len)
528 #define Set_Node_Length(node,len)
529 #define Set_Node_Cur_Length(node)
530 #define Node_Offset(n)
531 #define Node_Length(n)
532 #define Set_Node_Offset_Length(node,offset,len)
533 #define ProgLen(ri) ri->u.proglen
534 #define SetProgLen(ri,x) ri->u.proglen = x
536 #define ProgLen(ri) ri->u.offsets[0]
537 #define SetProgLen(ri,x) ri->u.offsets[0] = x
538 #define Set_Node_Offset_To_R(node,byte) STMT_START { \
540 MJD_OFFSET_DEBUG(("** (%d) offset of node %d is %d.\n", \
541 __LINE__, (int)(node), (int)(byte))); \
543 Perl_croak(aTHX_ "value of node is %d in Offset macro", (int)(node)); \
545 RExC_offsets[2*(node)-1] = (byte); \
550 #define Set_Node_Offset(node,byte) \
551 Set_Node_Offset_To_R((node)-RExC_emit_start, (byte)-RExC_start)
552 #define Set_Cur_Node_Offset Set_Node_Offset(RExC_emit, RExC_parse)
554 #define Set_Node_Length_To_R(node,len) STMT_START { \
556 MJD_OFFSET_DEBUG(("** (%d) size of node %d is %d.\n", \
557 __LINE__, (int)(node), (int)(len))); \
559 Perl_croak(aTHX_ "value of node is %d in Length macro", (int)(node)); \
561 RExC_offsets[2*(node)] = (len); \
566 #define Set_Node_Length(node,len) \
567 Set_Node_Length_To_R((node)-RExC_emit_start, len)
568 #define Set_Cur_Node_Length(len) Set_Node_Length(RExC_emit, len)
569 #define Set_Node_Cur_Length(node) \
570 Set_Node_Length(node, RExC_parse - parse_start)
572 /* Get offsets and lengths */
573 #define Node_Offset(n) (RExC_offsets[2*((n)-RExC_emit_start)-1])
574 #define Node_Length(n) (RExC_offsets[2*((n)-RExC_emit_start)])
576 #define Set_Node_Offset_Length(node,offset,len) STMT_START { \
577 Set_Node_Offset_To_R((node)-RExC_emit_start, (offset)); \
578 Set_Node_Length_To_R((node)-RExC_emit_start, (len)); \
582 #if PERL_ENABLE_EXPERIMENTAL_REGEX_OPTIMISATIONS
583 #define EXPERIMENTAL_INPLACESCAN
584 #endif /*RE_TRACK_PATTERN_OFFSETS*/
586 #define DEBUG_STUDYDATA(str,data,depth) \
587 DEBUG_OPTIMISE_MORE_r(if(data){ \
588 PerlIO_printf(Perl_debug_log, \
589 "%*s" str "Pos:%"IVdf"/%"IVdf \
590 " Flags: 0x%"UVXf" Whilem_c: %"IVdf" Lcp: %"IVdf" %s", \
591 (int)(depth)*2, "", \
592 (IV)((data)->pos_min), \
593 (IV)((data)->pos_delta), \
594 (UV)((data)->flags), \
595 (IV)((data)->whilem_c), \
596 (IV)((data)->last_closep ? *((data)->last_closep) : -1), \
597 is_inf ? "INF " : "" \
599 if ((data)->last_found) \
600 PerlIO_printf(Perl_debug_log, \
601 "Last:'%s' %"IVdf":%"IVdf"/%"IVdf" %sFixed:'%s' @ %"IVdf \
602 " %sFloat: '%s' @ %"IVdf"/%"IVdf"", \
603 SvPVX_const((data)->last_found), \
604 (IV)((data)->last_end), \
605 (IV)((data)->last_start_min), \
606 (IV)((data)->last_start_max), \
607 ((data)->longest && \
608 (data)->longest==&((data)->longest_fixed)) ? "*" : "", \
609 SvPVX_const((data)->longest_fixed), \
610 (IV)((data)->offset_fixed), \
611 ((data)->longest && \
612 (data)->longest==&((data)->longest_float)) ? "*" : "", \
613 SvPVX_const((data)->longest_float), \
614 (IV)((data)->offset_float_min), \
615 (IV)((data)->offset_float_max) \
617 PerlIO_printf(Perl_debug_log,"\n"); \
620 static void clear_re(pTHX_ void *r);
622 /* Mark that we cannot extend a found fixed substring at this point.
623 Update the longest found anchored substring and the longest found
624 floating substrings if needed. */
627 S_scan_commit(pTHX_ const RExC_state_t *pRExC_state, scan_data_t *data, I32 *minlenp, int is_inf)
629 const STRLEN l = CHR_SVLEN(data->last_found);
630 const STRLEN old_l = CHR_SVLEN(*data->longest);
631 GET_RE_DEBUG_FLAGS_DECL;
633 if ((l >= old_l) && ((l > old_l) || (data->flags & SF_BEFORE_EOL))) {
634 SvSetMagicSV(*data->longest, data->last_found);
635 if (*data->longest == data->longest_fixed) {
636 data->offset_fixed = l ? data->last_start_min : data->pos_min;
637 if (data->flags & SF_BEFORE_EOL)
639 |= ((data->flags & SF_BEFORE_EOL) << SF_FIX_SHIFT_EOL);
641 data->flags &= ~SF_FIX_BEFORE_EOL;
642 data->minlen_fixed=minlenp;
643 data->lookbehind_fixed=0;
645 else { /* *data->longest == data->longest_float */
646 data->offset_float_min = l ? data->last_start_min : data->pos_min;
647 data->offset_float_max = (l
648 ? data->last_start_max
649 : data->pos_min + data->pos_delta);
650 if (is_inf || (U32)data->offset_float_max > (U32)I32_MAX)
651 data->offset_float_max = I32_MAX;
652 if (data->flags & SF_BEFORE_EOL)
654 |= ((data->flags & SF_BEFORE_EOL) << SF_FL_SHIFT_EOL);
656 data->flags &= ~SF_FL_BEFORE_EOL;
657 data->minlen_float=minlenp;
658 data->lookbehind_float=0;
661 SvCUR_set(data->last_found, 0);
663 SV * const sv = data->last_found;
664 if (SvUTF8(sv) && SvMAGICAL(sv)) {
665 MAGIC * const mg = mg_find(sv, PERL_MAGIC_utf8);
671 data->flags &= ~SF_BEFORE_EOL;
672 DEBUG_STUDYDATA("commit: ",data,0);
675 /* Can match anything (initialization) */
677 S_cl_anything(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
679 ANYOF_CLASS_ZERO(cl);
680 ANYOF_BITMAP_SETALL(cl);
681 cl->flags = ANYOF_EOS|ANYOF_UNICODE_ALL;
683 cl->flags |= ANYOF_LOCALE;
686 /* Can match anything (initialization) */
688 S_cl_is_anything(const struct regnode_charclass_class *cl)
692 for (value = 0; value <= ANYOF_MAX; value += 2)
693 if (ANYOF_CLASS_TEST(cl, value) && ANYOF_CLASS_TEST(cl, value + 1))
695 if (!(cl->flags & ANYOF_UNICODE_ALL))
697 if (!ANYOF_BITMAP_TESTALLSET((const void*)cl))
702 /* Can match anything (initialization) */
704 S_cl_init(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
706 Zero(cl, 1, struct regnode_charclass_class);
708 cl_anything(pRExC_state, cl);
712 S_cl_init_zero(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
714 Zero(cl, 1, struct regnode_charclass_class);
716 cl_anything(pRExC_state, cl);
718 cl->flags |= ANYOF_LOCALE;
721 /* 'And' a given class with another one. Can create false positives */
722 /* We assume that cl is not inverted */
724 S_cl_and(struct regnode_charclass_class *cl,
725 const struct regnode_charclass_class *and_with)
728 assert(and_with->type == ANYOF);
729 if (!(and_with->flags & ANYOF_CLASS)
730 && !(cl->flags & ANYOF_CLASS)
731 && (and_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
732 && !(and_with->flags & ANYOF_FOLD)
733 && !(cl->flags & ANYOF_FOLD)) {
736 if (and_with->flags & ANYOF_INVERT)
737 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
738 cl->bitmap[i] &= ~and_with->bitmap[i];
740 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
741 cl->bitmap[i] &= and_with->bitmap[i];
742 } /* XXXX: logic is complicated otherwise, leave it along for a moment. */
743 if (!(and_with->flags & ANYOF_EOS))
744 cl->flags &= ~ANYOF_EOS;
746 if (cl->flags & ANYOF_UNICODE_ALL && and_with->flags & ANYOF_UNICODE &&
747 !(and_with->flags & ANYOF_INVERT)) {
748 cl->flags &= ~ANYOF_UNICODE_ALL;
749 cl->flags |= ANYOF_UNICODE;
750 ARG_SET(cl, ARG(and_with));
752 if (!(and_with->flags & ANYOF_UNICODE_ALL) &&
753 !(and_with->flags & ANYOF_INVERT))
754 cl->flags &= ~ANYOF_UNICODE_ALL;
755 if (!(and_with->flags & (ANYOF_UNICODE|ANYOF_UNICODE_ALL)) &&
756 !(and_with->flags & ANYOF_INVERT))
757 cl->flags &= ~ANYOF_UNICODE;
760 /* 'OR' a given class with another one. Can create false positives */
761 /* We assume that cl is not inverted */
763 S_cl_or(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl, const struct regnode_charclass_class *or_with)
765 if (or_with->flags & ANYOF_INVERT) {
767 * (B1 | CL1) | (!B2 & !CL2) = (B1 | !B2 & !CL2) | (CL1 | (!B2 & !CL2))
768 * <= (B1 | !B2) | (CL1 | !CL2)
769 * which is wasteful if CL2 is small, but we ignore CL2:
770 * (B1 | CL1) | (!B2 & !CL2) <= (B1 | CL1) | !B2 = (B1 | !B2) | CL1
771 * XXXX Can we handle case-fold? Unclear:
772 * (OK1(i) | OK1(i')) | !(OK1(i) | OK1(i')) =
773 * (OK1(i) | OK1(i')) | (!OK1(i) & !OK1(i'))
775 if ( (or_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
776 && !(or_with->flags & ANYOF_FOLD)
777 && !(cl->flags & ANYOF_FOLD) ) {
780 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
781 cl->bitmap[i] |= ~or_with->bitmap[i];
782 } /* XXXX: logic is complicated otherwise */
784 cl_anything(pRExC_state, cl);
787 /* (B1 | CL1) | (B2 | CL2) = (B1 | B2) | (CL1 | CL2)) */
788 if ( (or_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
789 && (!(or_with->flags & ANYOF_FOLD)
790 || (cl->flags & ANYOF_FOLD)) ) {
793 /* OR char bitmap and class bitmap separately */
794 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
795 cl->bitmap[i] |= or_with->bitmap[i];
796 if (or_with->flags & ANYOF_CLASS) {
797 for (i = 0; i < ANYOF_CLASSBITMAP_SIZE; i++)
798 cl->classflags[i] |= or_with->classflags[i];
799 cl->flags |= ANYOF_CLASS;
802 else { /* XXXX: logic is complicated, leave it along for a moment. */
803 cl_anything(pRExC_state, cl);
806 if (or_with->flags & ANYOF_EOS)
807 cl->flags |= ANYOF_EOS;
809 if (cl->flags & ANYOF_UNICODE && or_with->flags & ANYOF_UNICODE &&
810 ARG(cl) != ARG(or_with)) {
811 cl->flags |= ANYOF_UNICODE_ALL;
812 cl->flags &= ~ANYOF_UNICODE;
814 if (or_with->flags & ANYOF_UNICODE_ALL) {
815 cl->flags |= ANYOF_UNICODE_ALL;
816 cl->flags &= ~ANYOF_UNICODE;
820 #define TRIE_LIST_ITEM(state,idx) (trie->states[state].trans.list)[ idx ]
821 #define TRIE_LIST_CUR(state) ( TRIE_LIST_ITEM( state, 0 ).forid )
822 #define TRIE_LIST_LEN(state) ( TRIE_LIST_ITEM( state, 0 ).newstate )
823 #define TRIE_LIST_USED(idx) ( trie->states[state].trans.list ? (TRIE_LIST_CUR( idx ) - 1) : 0 )
828 dump_trie(trie,widecharmap,revcharmap)
829 dump_trie_interim_list(trie,widecharmap,revcharmap,next_alloc)
830 dump_trie_interim_table(trie,widecharmap,revcharmap,next_alloc)
832 These routines dump out a trie in a somewhat readable format.
833 The _interim_ variants are used for debugging the interim
834 tables that are used to generate the final compressed
835 representation which is what dump_trie expects.
837 Part of the reason for their existance is to provide a form
838 of documentation as to how the different representations function.
843 Dumps the final compressed table form of the trie to Perl_debug_log.
844 Used for debugging make_trie().
848 S_dump_trie(pTHX_ const struct _reg_trie_data *trie, HV *widecharmap,
849 AV *revcharmap, U32 depth)
852 SV *sv=sv_newmortal();
853 int colwidth= widecharmap ? 6 : 4;
854 GET_RE_DEBUG_FLAGS_DECL;
857 PerlIO_printf( Perl_debug_log, "%*sChar : %-6s%-6s%-4s ",
858 (int)depth * 2 + 2,"",
859 "Match","Base","Ofs" );
861 for( state = 0 ; state < trie->uniquecharcount ; state++ ) {
862 SV ** const tmp = av_fetch( revcharmap, state, 0);
864 PerlIO_printf( Perl_debug_log, "%*s",
866 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
867 PL_colors[0], PL_colors[1],
868 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
869 PERL_PV_ESCAPE_FIRSTCHAR
874 PerlIO_printf( Perl_debug_log, "\n%*sState|-----------------------",
875 (int)depth * 2 + 2,"");
877 for( state = 0 ; state < trie->uniquecharcount ; state++ )
878 PerlIO_printf( Perl_debug_log, "%.*s", colwidth, "--------");
879 PerlIO_printf( Perl_debug_log, "\n");
881 for( state = 1 ; state < trie->statecount ; state++ ) {
882 const U32 base = trie->states[ state ].trans.base;
884 PerlIO_printf( Perl_debug_log, "%*s#%4"UVXf"|", (int)depth * 2 + 2,"", (UV)state);
886 if ( trie->states[ state ].wordnum ) {
887 PerlIO_printf( Perl_debug_log, " W%4X", trie->states[ state ].wordnum );
889 PerlIO_printf( Perl_debug_log, "%6s", "" );
892 PerlIO_printf( Perl_debug_log, " @%4"UVXf" ", (UV)base );
897 while( ( base + ofs < trie->uniquecharcount ) ||
898 ( base + ofs - trie->uniquecharcount < trie->lasttrans
899 && trie->trans[ base + ofs - trie->uniquecharcount ].check != state))
902 PerlIO_printf( Perl_debug_log, "+%2"UVXf"[ ", (UV)ofs);
904 for ( ofs = 0 ; ofs < trie->uniquecharcount ; ofs++ ) {
905 if ( ( base + ofs >= trie->uniquecharcount ) &&
906 ( base + ofs - trie->uniquecharcount < trie->lasttrans ) &&
907 trie->trans[ base + ofs - trie->uniquecharcount ].check == state )
909 PerlIO_printf( Perl_debug_log, "%*"UVXf,
911 (UV)trie->trans[ base + ofs - trie->uniquecharcount ].next );
913 PerlIO_printf( Perl_debug_log, "%*s",colwidth," ." );
917 PerlIO_printf( Perl_debug_log, "]");
920 PerlIO_printf( Perl_debug_log, "\n" );
924 Dumps a fully constructed but uncompressed trie in list form.
925 List tries normally only are used for construction when the number of
926 possible chars (trie->uniquecharcount) is very high.
927 Used for debugging make_trie().
930 S_dump_trie_interim_list(pTHX_ const struct _reg_trie_data *trie,
931 HV *widecharmap, AV *revcharmap, U32 next_alloc,
935 SV *sv=sv_newmortal();
936 int colwidth= widecharmap ? 6 : 4;
937 GET_RE_DEBUG_FLAGS_DECL;
938 /* print out the table precompression. */
939 PerlIO_printf( Perl_debug_log, "%*sState :Word | Transition Data\n%*s%s",
940 (int)depth * 2 + 2,"", (int)depth * 2 + 2,"",
941 "------:-----+-----------------\n" );
943 for( state=1 ; state < next_alloc ; state ++ ) {
946 PerlIO_printf( Perl_debug_log, "%*s %4"UVXf" :",
947 (int)depth * 2 + 2,"", (UV)state );
948 if ( ! trie->states[ state ].wordnum ) {
949 PerlIO_printf( Perl_debug_log, "%5s| ","");
951 PerlIO_printf( Perl_debug_log, "W%4x| ",
952 trie->states[ state ].wordnum
955 for( charid = 1 ; charid <= TRIE_LIST_USED( state ) ; charid++ ) {
956 SV ** const tmp = av_fetch( revcharmap, TRIE_LIST_ITEM(state,charid).forid, 0);
958 PerlIO_printf( Perl_debug_log, "%*s:%3X=%4"UVXf" | ",
960 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
961 PL_colors[0], PL_colors[1],
962 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
963 PERL_PV_ESCAPE_FIRSTCHAR
965 TRIE_LIST_ITEM(state,charid).forid,
966 (UV)TRIE_LIST_ITEM(state,charid).newstate
969 PerlIO_printf(Perl_debug_log, "\n%*s| ",
970 (int)((depth * 2) + 14), "");
973 PerlIO_printf( Perl_debug_log, "\n");
978 Dumps a fully constructed but uncompressed trie in table form.
979 This is the normal DFA style state transition table, with a few
980 twists to facilitate compression later.
981 Used for debugging make_trie().
984 S_dump_trie_interim_table(pTHX_ const struct _reg_trie_data *trie,
985 HV *widecharmap, AV *revcharmap, U32 next_alloc,
990 SV *sv=sv_newmortal();
991 int colwidth= widecharmap ? 6 : 4;
992 GET_RE_DEBUG_FLAGS_DECL;
995 print out the table precompression so that we can do a visual check
996 that they are identical.
999 PerlIO_printf( Perl_debug_log, "%*sChar : ",(int)depth * 2 + 2,"" );
1001 for( charid = 0 ; charid < trie->uniquecharcount ; charid++ ) {
1002 SV ** const tmp = av_fetch( revcharmap, charid, 0);
1004 PerlIO_printf( Perl_debug_log, "%*s",
1006 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
1007 PL_colors[0], PL_colors[1],
1008 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
1009 PERL_PV_ESCAPE_FIRSTCHAR
1015 PerlIO_printf( Perl_debug_log, "\n%*sState+-",(int)depth * 2 + 2,"" );
1017 for( charid=0 ; charid < trie->uniquecharcount ; charid++ ) {
1018 PerlIO_printf( Perl_debug_log, "%.*s", colwidth,"--------");
1021 PerlIO_printf( Perl_debug_log, "\n" );
1023 for( state=1 ; state < next_alloc ; state += trie->uniquecharcount ) {
1025 PerlIO_printf( Perl_debug_log, "%*s%4"UVXf" : ",
1026 (int)depth * 2 + 2,"",
1027 (UV)TRIE_NODENUM( state ) );
1029 for( charid = 0 ; charid < trie->uniquecharcount ; charid++ ) {
1030 UV v=(UV)SAFE_TRIE_NODENUM( trie->trans[ state + charid ].next );
1032 PerlIO_printf( Perl_debug_log, "%*"UVXf, colwidth, v );
1034 PerlIO_printf( Perl_debug_log, "%*s", colwidth, "." );
1036 if ( ! trie->states[ TRIE_NODENUM( state ) ].wordnum ) {
1037 PerlIO_printf( Perl_debug_log, " (%4"UVXf")\n", (UV)trie->trans[ state ].check );
1039 PerlIO_printf( Perl_debug_log, " (%4"UVXf") W%4X\n", (UV)trie->trans[ state ].check,
1040 trie->states[ TRIE_NODENUM( state ) ].wordnum );
1047 /* make_trie(startbranch,first,last,tail,word_count,flags,depth)
1048 startbranch: the first branch in the whole branch sequence
1049 first : start branch of sequence of branch-exact nodes.
1050 May be the same as startbranch
1051 last : Thing following the last branch.
1052 May be the same as tail.
1053 tail : item following the branch sequence
1054 count : words in the sequence
1055 flags : currently the OP() type we will be building one of /EXACT(|F|Fl)/
1056 depth : indent depth
1058 Inplace optimizes a sequence of 2 or more Branch-Exact nodes into a TRIE node.
1060 A trie is an N'ary tree where the branches are determined by digital
1061 decomposition of the key. IE, at the root node you look up the 1st character and
1062 follow that branch repeat until you find the end of the branches. Nodes can be
1063 marked as "accepting" meaning they represent a complete word. Eg:
1067 would convert into the following structure. Numbers represent states, letters
1068 following numbers represent valid transitions on the letter from that state, if
1069 the number is in square brackets it represents an accepting state, otherwise it
1070 will be in parenthesis.
1072 +-h->+-e->[3]-+-r->(8)-+-s->[9]
1076 (1) +-i->(6)-+-s->[7]
1078 +-s->(3)-+-h->(4)-+-e->[5]
1080 Accept Word Mapping: 3=>1 (he),5=>2 (she), 7=>3 (his), 9=>4 (hers)
1082 This shows that when matching against the string 'hers' we will begin at state 1
1083 read 'h' and move to state 2, read 'e' and move to state 3 which is accepting,
1084 then read 'r' and go to state 8 followed by 's' which takes us to state 9 which
1085 is also accepting. Thus we know that we can match both 'he' and 'hers' with a
1086 single traverse. We store a mapping from accepting to state to which word was
1087 matched, and then when we have multiple possibilities we try to complete the
1088 rest of the regex in the order in which they occured in the alternation.
1090 The only prior NFA like behaviour that would be changed by the TRIE support is
1091 the silent ignoring of duplicate alternations which are of the form:
1093 / (DUPE|DUPE) X? (?{ ... }) Y /x
1095 Thus EVAL blocks follwing a trie may be called a different number of times with
1096 and without the optimisation. With the optimisations dupes will be silently
1097 ignored. This inconsistant behaviour of EVAL type nodes is well established as
1098 the following demonstrates:
1100 'words'=~/(word|word|word)(?{ print $1 })[xyz]/
1102 which prints out 'word' three times, but
1104 'words'=~/(word|word|word)(?{ print $1 })S/
1106 which doesnt print it out at all. This is due to other optimisations kicking in.
1108 Example of what happens on a structural level:
1110 The regexp /(ac|ad|ab)+/ will produce the folowing debug output:
1112 1: CURLYM[1] {1,32767}(18)
1123 This would be optimizable with startbranch=5, first=5, last=16, tail=16
1124 and should turn into:
1126 1: CURLYM[1] {1,32767}(18)
1128 [Words:3 Chars Stored:6 Unique Chars:4 States:5 NCP:1]
1136 Cases where tail != last would be like /(?foo|bar)baz/:
1146 which would be optimizable with startbranch=1, first=1, last=7, tail=8
1147 and would end up looking like:
1150 [Words:2 Chars Stored:6 Unique Chars:5 States:7 NCP:1]
1157 d = uvuni_to_utf8_flags(d, uv, 0);
1159 is the recommended Unicode-aware way of saying
1164 #define TRIE_STORE_REVCHAR \
1166 SV *tmp = newSVpvs(""); \
1167 if (UTF) SvUTF8_on(tmp); \
1168 Perl_sv_catpvf( aTHX_ tmp, "%c", (int)uvc ); \
1169 av_push( revcharmap, tmp ); \
1172 #define TRIE_READ_CHAR STMT_START { \
1176 if ( foldlen > 0 ) { \
1177 uvc = utf8n_to_uvuni( scan, UTF8_MAXLEN, &len, uniflags ); \
1182 uvc = utf8n_to_uvuni( (const U8*)uc, UTF8_MAXLEN, &len, uniflags);\
1183 uvc = to_uni_fold( uvc, foldbuf, &foldlen ); \
1184 foldlen -= UNISKIP( uvc ); \
1185 scan = foldbuf + UNISKIP( uvc ); \
1188 uvc = utf8n_to_uvuni( (const U8*)uc, UTF8_MAXLEN, &len, uniflags);\
1198 #define TRIE_LIST_PUSH(state,fid,ns) STMT_START { \
1199 if ( TRIE_LIST_CUR( state ) >=TRIE_LIST_LEN( state ) ) { \
1200 U32 ging = TRIE_LIST_LEN( state ) *= 2; \
1201 Renew( trie->states[ state ].trans.list, ging, reg_trie_trans_le ); \
1203 TRIE_LIST_ITEM( state, TRIE_LIST_CUR( state ) ).forid = fid; \
1204 TRIE_LIST_ITEM( state, TRIE_LIST_CUR( state ) ).newstate = ns; \
1205 TRIE_LIST_CUR( state )++; \
1208 #define TRIE_LIST_NEW(state) STMT_START { \
1209 Newxz( trie->states[ state ].trans.list, \
1210 4, reg_trie_trans_le ); \
1211 TRIE_LIST_CUR( state ) = 1; \
1212 TRIE_LIST_LEN( state ) = 4; \
1215 #define TRIE_HANDLE_WORD(state) STMT_START { \
1216 U16 dupe= trie->states[ state ].wordnum; \
1217 regnode * const noper_next = regnext( noper ); \
1219 if (trie->wordlen) \
1220 trie->wordlen[ curword ] = wordlen; \
1222 /* store the word for dumping */ \
1224 if (OP(noper) != NOTHING) \
1225 tmp = newSVpvn(STRING(noper), STR_LEN(noper)); \
1227 tmp = newSVpvn( "", 0 ); \
1228 if ( UTF ) SvUTF8_on( tmp ); \
1229 av_push( trie_words, tmp ); \
1234 if ( noper_next < tail ) { \
1236 trie->jump = (U16 *) PerlMemShared_calloc( word_count + 1, sizeof(U16) ); \
1237 trie->jump[curword] = (U16)(noper_next - convert); \
1239 jumper = noper_next; \
1241 nextbranch= regnext(cur); \
1245 /* So it's a dupe. This means we need to maintain a */\
1246 /* linked-list from the first to the next. */\
1247 /* we only allocate the nextword buffer when there */\
1248 /* a dupe, so first time we have to do the allocation */\
1249 if (!trie->nextword) \
1250 trie->nextword = (U16 *) \
1251 PerlMemShared_calloc( word_count + 1, sizeof(U16)); \
1252 while ( trie->nextword[dupe] ) \
1253 dupe= trie->nextword[dupe]; \
1254 trie->nextword[dupe]= curword; \
1256 /* we haven't inserted this word yet. */ \
1257 trie->states[ state ].wordnum = curword; \
1262 #define TRIE_TRANS_STATE(state,base,ucharcount,charid,special) \
1263 ( ( base + charid >= ucharcount \
1264 && base + charid < ubound \
1265 && state == trie->trans[ base - ucharcount + charid ].check \
1266 && trie->trans[ base - ucharcount + charid ].next ) \
1267 ? trie->trans[ base - ucharcount + charid ].next \
1268 : ( state==1 ? special : 0 ) \
1272 #define MADE_JUMP_TRIE 2
1273 #define MADE_EXACT_TRIE 4
1276 S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *first, regnode *last, regnode *tail, U32 word_count, U32 flags, U32 depth)
1279 /* first pass, loop through and scan words */
1280 reg_trie_data *trie;
1281 HV *widecharmap = NULL;
1282 AV *revcharmap = newAV();
1284 const U32 uniflags = UTF8_ALLOW_DEFAULT;
1289 regnode *jumper = NULL;
1290 regnode *nextbranch = NULL;
1291 regnode *convert = NULL;
1292 /* we just use folder as a flag in utf8 */
1293 const U8 * const folder = ( flags == EXACTF
1295 : ( flags == EXACTFL
1302 const U32 data_slot = add_data( pRExC_state, 4, "tuuu" );
1303 AV *trie_words = NULL;
1304 /* along with revcharmap, this only used during construction but both are
1305 * useful during debugging so we store them in the struct when debugging.
1308 const U32 data_slot = add_data( pRExC_state, 2, "tu" );
1309 STRLEN trie_charcount=0;
1311 SV *re_trie_maxbuff;
1312 GET_RE_DEBUG_FLAGS_DECL;
1314 PERL_UNUSED_ARG(depth);
1317 trie = (reg_trie_data *) PerlMemShared_calloc( 1, sizeof(reg_trie_data) );
1319 trie->startstate = 1;
1320 trie->wordcount = word_count;
1321 RExC_rxi->data->data[ data_slot ] = (void*)trie;
1322 trie->charmap = (U16 *) PerlMemShared_calloc( 256, sizeof(U16) );
1323 if (!(UTF && folder))
1324 trie->bitmap = (char *) PerlMemShared_calloc( ANYOF_BITMAP_SIZE, 1 );
1326 trie_words = newAV();
1329 re_trie_maxbuff = get_sv(RE_TRIE_MAXBUF_NAME, 1);
1330 if (!SvIOK(re_trie_maxbuff)) {
1331 sv_setiv(re_trie_maxbuff, RE_TRIE_MAXBUF_INIT);
1334 PerlIO_printf( Perl_debug_log,
1335 "%*smake_trie start==%d, first==%d, last==%d, tail==%d depth=%d\n",
1336 (int)depth * 2 + 2, "",
1337 REG_NODE_NUM(startbranch),REG_NODE_NUM(first),
1338 REG_NODE_NUM(last), REG_NODE_NUM(tail),
1342 /* Find the node we are going to overwrite */
1343 if ( first == startbranch && OP( last ) != BRANCH ) {
1344 /* whole branch chain */
1347 /* branch sub-chain */
1348 convert = NEXTOPER( first );
1351 /* -- First loop and Setup --
1353 We first traverse the branches and scan each word to determine if it
1354 contains widechars, and how many unique chars there are, this is
1355 important as we have to build a table with at least as many columns as we
1358 We use an array of integers to represent the character codes 0..255
1359 (trie->charmap) and we use a an HV* to store unicode characters. We use the
1360 native representation of the character value as the key and IV's for the
1363 *TODO* If we keep track of how many times each character is used we can
1364 remap the columns so that the table compression later on is more
1365 efficient in terms of memory by ensuring most common value is in the
1366 middle and the least common are on the outside. IMO this would be better
1367 than a most to least common mapping as theres a decent chance the most
1368 common letter will share a node with the least common, meaning the node
1369 will not be compressable. With a middle is most common approach the worst
1370 case is when we have the least common nodes twice.
1374 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1375 regnode * const noper = NEXTOPER( cur );
1376 const U8 *uc = (U8*)STRING( noper );
1377 const U8 * const e = uc + STR_LEN( noper );
1379 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1380 const U8 *scan = (U8*)NULL;
1381 U32 wordlen = 0; /* required init */
1383 bool set_bit = trie->bitmap ? 1 : 0; /*store the first char in the bitmap?*/
1385 if (OP(noper) == NOTHING) {
1389 if ( set_bit ) /* bitmap only alloced when !(UTF&&Folding) */
1390 TRIE_BITMAP_SET(trie,*uc); /* store the raw first byte
1391 regardless of encoding */
1393 for ( ; uc < e ; uc += len ) {
1394 TRIE_CHARCOUNT(trie)++;
1398 if ( !trie->charmap[ uvc ] ) {
1399 trie->charmap[ uvc ]=( ++trie->uniquecharcount );
1401 trie->charmap[ folder[ uvc ] ] = trie->charmap[ uvc ];
1405 /* store the codepoint in the bitmap, and if its ascii
1406 also store its folded equivelent. */
1407 TRIE_BITMAP_SET(trie,uvc);
1408 if ( folder ) TRIE_BITMAP_SET(trie,folder[ uvc ]);
1409 set_bit = 0; /* We've done our bit :-) */
1414 widecharmap = newHV();
1416 svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 1 );
1419 Perl_croak( aTHX_ "error creating/fetching widecharmap entry for 0x%"UVXf, uvc );
1421 if ( !SvTRUE( *svpp ) ) {
1422 sv_setiv( *svpp, ++trie->uniquecharcount );
1427 if( cur == first ) {
1430 } else if (chars < trie->minlen) {
1432 } else if (chars > trie->maxlen) {
1436 } /* end first pass */
1437 DEBUG_TRIE_COMPILE_r(
1438 PerlIO_printf( Perl_debug_log, "%*sTRIE(%s): W:%d C:%d Uq:%d Min:%d Max:%d\n",
1439 (int)depth * 2 + 2,"",
1440 ( widecharmap ? "UTF8" : "NATIVE" ), (int)word_count,
1441 (int)TRIE_CHARCOUNT(trie), trie->uniquecharcount,
1442 (int)trie->minlen, (int)trie->maxlen )
1444 trie->wordlen = (U32 *) PerlMemShared_calloc( word_count, sizeof(U32) );
1447 We now know what we are dealing with in terms of unique chars and
1448 string sizes so we can calculate how much memory a naive
1449 representation using a flat table will take. If it's over a reasonable
1450 limit (as specified by ${^RE_TRIE_MAXBUF}) we use a more memory
1451 conservative but potentially much slower representation using an array
1454 At the end we convert both representations into the same compressed
1455 form that will be used in regexec.c for matching with. The latter
1456 is a form that cannot be used to construct with but has memory
1457 properties similar to the list form and access properties similar
1458 to the table form making it both suitable for fast searches and
1459 small enough that its feasable to store for the duration of a program.
1461 See the comment in the code where the compressed table is produced
1462 inplace from the flat tabe representation for an explanation of how
1463 the compression works.
1468 if ( (IV)( ( TRIE_CHARCOUNT(trie) + 1 ) * trie->uniquecharcount + 1) > SvIV(re_trie_maxbuff) ) {
1470 Second Pass -- Array Of Lists Representation
1472 Each state will be represented by a list of charid:state records
1473 (reg_trie_trans_le) the first such element holds the CUR and LEN
1474 points of the allocated array. (See defines above).
1476 We build the initial structure using the lists, and then convert
1477 it into the compressed table form which allows faster lookups
1478 (but cant be modified once converted).
1481 STRLEN transcount = 1;
1483 DEBUG_TRIE_COMPILE_MORE_r( PerlIO_printf( Perl_debug_log,
1484 "%*sCompiling trie using list compiler\n",
1485 (int)depth * 2 + 2, ""));
1487 trie->states = (reg_trie_state *)
1488 PerlMemShared_calloc( TRIE_CHARCOUNT(trie) + 2,
1489 sizeof(reg_trie_state) );
1493 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1495 regnode * const noper = NEXTOPER( cur );
1496 U8 *uc = (U8*)STRING( noper );
1497 const U8 * const e = uc + STR_LEN( noper );
1498 U32 state = 1; /* required init */
1499 U16 charid = 0; /* sanity init */
1500 U8 *scan = (U8*)NULL; /* sanity init */
1501 STRLEN foldlen = 0; /* required init */
1502 U32 wordlen = 0; /* required init */
1503 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1505 if (OP(noper) != NOTHING) {
1506 for ( ; uc < e ; uc += len ) {
1511 charid = trie->charmap[ uvc ];
1513 SV** const svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 0);
1517 charid=(U16)SvIV( *svpp );
1520 /* charid is now 0 if we dont know the char read, or nonzero if we do */
1527 if ( !trie->states[ state ].trans.list ) {
1528 TRIE_LIST_NEW( state );
1530 for ( check = 1; check <= TRIE_LIST_USED( state ); check++ ) {
1531 if ( TRIE_LIST_ITEM( state, check ).forid == charid ) {
1532 newstate = TRIE_LIST_ITEM( state, check ).newstate;
1537 newstate = next_alloc++;
1538 TRIE_LIST_PUSH( state, charid, newstate );
1543 Perl_croak( aTHX_ "panic! In trie construction, no char mapping for %"IVdf, uvc );
1547 TRIE_HANDLE_WORD(state);
1549 } /* end second pass */
1551 /* next alloc is the NEXT state to be allocated */
1552 trie->statecount = next_alloc;
1553 trie->states = (reg_trie_state *)
1554 PerlMemShared_realloc( trie->states,
1556 * sizeof(reg_trie_state) );
1558 /* and now dump it out before we compress it */
1559 DEBUG_TRIE_COMPILE_MORE_r(dump_trie_interim_list(trie, widecharmap,
1560 revcharmap, next_alloc,
1564 trie->trans = (reg_trie_trans *)
1565 PerlMemShared_calloc( transcount, sizeof(reg_trie_trans) );
1572 for( state=1 ; state < next_alloc ; state ++ ) {
1576 DEBUG_TRIE_COMPILE_MORE_r(
1577 PerlIO_printf( Perl_debug_log, "tp: %d zp: %d ",tp,zp)
1581 if (trie->states[state].trans.list) {
1582 U16 minid=TRIE_LIST_ITEM( state, 1).forid;
1586 for( idx = 2 ; idx <= TRIE_LIST_USED( state ) ; idx++ ) {
1587 const U16 forid = TRIE_LIST_ITEM( state, idx).forid;
1588 if ( forid < minid ) {
1590 } else if ( forid > maxid ) {
1594 if ( transcount < tp + maxid - minid + 1) {
1596 trie->trans = (reg_trie_trans *)
1597 PerlMemShared_realloc( trie->trans,
1599 * sizeof(reg_trie_trans) );
1600 Zero( trie->trans + (transcount / 2), transcount / 2 , reg_trie_trans );
1602 base = trie->uniquecharcount + tp - minid;
1603 if ( maxid == minid ) {
1605 for ( ; zp < tp ; zp++ ) {
1606 if ( ! trie->trans[ zp ].next ) {
1607 base = trie->uniquecharcount + zp - minid;
1608 trie->trans[ zp ].next = TRIE_LIST_ITEM( state, 1).newstate;
1609 trie->trans[ zp ].check = state;
1615 trie->trans[ tp ].next = TRIE_LIST_ITEM( state, 1).newstate;
1616 trie->trans[ tp ].check = state;
1621 for ( idx=1; idx <= TRIE_LIST_USED( state ) ; idx++ ) {
1622 const U32 tid = base - trie->uniquecharcount + TRIE_LIST_ITEM( state, idx ).forid;
1623 trie->trans[ tid ].next = TRIE_LIST_ITEM( state, idx ).newstate;
1624 trie->trans[ tid ].check = state;
1626 tp += ( maxid - minid + 1 );
1628 Safefree(trie->states[ state ].trans.list);
1631 DEBUG_TRIE_COMPILE_MORE_r(
1632 PerlIO_printf( Perl_debug_log, " base: %d\n",base);
1635 trie->states[ state ].trans.base=base;
1637 trie->lasttrans = tp + 1;
1641 Second Pass -- Flat Table Representation.
1643 we dont use the 0 slot of either trans[] or states[] so we add 1 to each.
1644 We know that we will need Charcount+1 trans at most to store the data
1645 (one row per char at worst case) So we preallocate both structures
1646 assuming worst case.
1648 We then construct the trie using only the .next slots of the entry
1651 We use the .check field of the first entry of the node temporarily to
1652 make compression both faster and easier by keeping track of how many non
1653 zero fields are in the node.
1655 Since trans are numbered from 1 any 0 pointer in the table is a FAIL
1658 There are two terms at use here: state as a TRIE_NODEIDX() which is a
1659 number representing the first entry of the node, and state as a
1660 TRIE_NODENUM() which is the trans number. state 1 is TRIE_NODEIDX(1) and
1661 TRIE_NODENUM(1), state 2 is TRIE_NODEIDX(2) and TRIE_NODENUM(3) if there
1662 are 2 entrys per node. eg:
1670 The table is internally in the right hand, idx form. However as we also
1671 have to deal with the states array which is indexed by nodenum we have to
1672 use TRIE_NODENUM() to convert.
1675 DEBUG_TRIE_COMPILE_MORE_r( PerlIO_printf( Perl_debug_log,
1676 "%*sCompiling trie using table compiler\n",
1677 (int)depth * 2 + 2, ""));
1679 trie->trans = (reg_trie_trans *)
1680 PerlMemShared_calloc( ( TRIE_CHARCOUNT(trie) + 1 )
1681 * trie->uniquecharcount + 1,
1682 sizeof(reg_trie_trans) );
1683 trie->states = (reg_trie_state *)
1684 PerlMemShared_calloc( TRIE_CHARCOUNT(trie) + 2,
1685 sizeof(reg_trie_state) );
1686 next_alloc = trie->uniquecharcount + 1;
1689 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1691 regnode * const noper = NEXTOPER( cur );
1692 const U8 *uc = (U8*)STRING( noper );
1693 const U8 * const e = uc + STR_LEN( noper );
1695 U32 state = 1; /* required init */
1697 U16 charid = 0; /* sanity init */
1698 U32 accept_state = 0; /* sanity init */
1699 U8 *scan = (U8*)NULL; /* sanity init */
1701 STRLEN foldlen = 0; /* required init */
1702 U32 wordlen = 0; /* required init */
1703 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1705 if ( OP(noper) != NOTHING ) {
1706 for ( ; uc < e ; uc += len ) {
1711 charid = trie->charmap[ uvc ];
1713 SV* const * const svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 0);
1714 charid = svpp ? (U16)SvIV(*svpp) : 0;
1718 if ( !trie->trans[ state + charid ].next ) {
1719 trie->trans[ state + charid ].next = next_alloc;
1720 trie->trans[ state ].check++;
1721 next_alloc += trie->uniquecharcount;
1723 state = trie->trans[ state + charid ].next;
1725 Perl_croak( aTHX_ "panic! In trie construction, no char mapping for %"IVdf, uvc );
1727 /* charid is now 0 if we dont know the char read, or nonzero if we do */
1730 accept_state = TRIE_NODENUM( state );
1731 TRIE_HANDLE_WORD(accept_state);
1733 } /* end second pass */
1735 /* and now dump it out before we compress it */
1736 DEBUG_TRIE_COMPILE_MORE_r(dump_trie_interim_table(trie, widecharmap,
1738 next_alloc, depth+1));
1742 * Inplace compress the table.*
1744 For sparse data sets the table constructed by the trie algorithm will
1745 be mostly 0/FAIL transitions or to put it another way mostly empty.
1746 (Note that leaf nodes will not contain any transitions.)
1748 This algorithm compresses the tables by eliminating most such
1749 transitions, at the cost of a modest bit of extra work during lookup:
1751 - Each states[] entry contains a .base field which indicates the
1752 index in the state[] array wheres its transition data is stored.
1754 - If .base is 0 there are no valid transitions from that node.
1756 - If .base is nonzero then charid is added to it to find an entry in
1759 -If trans[states[state].base+charid].check!=state then the
1760 transition is taken to be a 0/Fail transition. Thus if there are fail
1761 transitions at the front of the node then the .base offset will point
1762 somewhere inside the previous nodes data (or maybe even into a node
1763 even earlier), but the .check field determines if the transition is
1767 The following process inplace converts the table to the compressed
1768 table: We first do not compress the root node 1,and mark its all its
1769 .check pointers as 1 and set its .base pointer as 1 as well. This
1770 allows to do a DFA construction from the compressed table later, and
1771 ensures that any .base pointers we calculate later are greater than
1774 - We set 'pos' to indicate the first entry of the second node.
1776 - We then iterate over the columns of the node, finding the first and
1777 last used entry at l and m. We then copy l..m into pos..(pos+m-l),
1778 and set the .check pointers accordingly, and advance pos
1779 appropriately and repreat for the next node. Note that when we copy
1780 the next pointers we have to convert them from the original
1781 NODEIDX form to NODENUM form as the former is not valid post
1784 - If a node has no transitions used we mark its base as 0 and do not
1785 advance the pos pointer.
1787 - If a node only has one transition we use a second pointer into the
1788 structure to fill in allocated fail transitions from other states.
1789 This pointer is independent of the main pointer and scans forward
1790 looking for null transitions that are allocated to a state. When it
1791 finds one it writes the single transition into the "hole". If the
1792 pointer doesnt find one the single transition is appended as normal.
1794 - Once compressed we can Renew/realloc the structures to release the
1797 See "Table-Compression Methods" in sec 3.9 of the Red Dragon,
1798 specifically Fig 3.47 and the associated pseudocode.
1802 const U32 laststate = TRIE_NODENUM( next_alloc );
1805 trie->statecount = laststate;
1807 for ( state = 1 ; state < laststate ; state++ ) {
1809 const U32 stateidx = TRIE_NODEIDX( state );
1810 const U32 o_used = trie->trans[ stateidx ].check;
1811 U32 used = trie->trans[ stateidx ].check;
1812 trie->trans[ stateidx ].check = 0;
1814 for ( charid = 0 ; used && charid < trie->uniquecharcount ; charid++ ) {
1815 if ( flag || trie->trans[ stateidx + charid ].next ) {
1816 if ( trie->trans[ stateidx + charid ].next ) {
1818 for ( ; zp < pos ; zp++ ) {
1819 if ( ! trie->trans[ zp ].next ) {
1823 trie->states[ state ].trans.base = zp + trie->uniquecharcount - charid ;
1824 trie->trans[ zp ].next = SAFE_TRIE_NODENUM( trie->trans[ stateidx + charid ].next );
1825 trie->trans[ zp ].check = state;
1826 if ( ++zp > pos ) pos = zp;
1833 trie->states[ state ].trans.base = pos + trie->uniquecharcount - charid ;
1835 trie->trans[ pos ].next = SAFE_TRIE_NODENUM( trie->trans[ stateidx + charid ].next );
1836 trie->trans[ pos ].check = state;
1841 trie->lasttrans = pos + 1;
1842 trie->states = (reg_trie_state *)
1843 PerlMemShared_realloc( trie->states, laststate
1844 * sizeof(reg_trie_state) );
1845 DEBUG_TRIE_COMPILE_MORE_r(
1846 PerlIO_printf( Perl_debug_log,
1847 "%*sAlloc: %d Orig: %"IVdf" elements, Final:%"IVdf". Savings of %%%5.2f\n",
1848 (int)depth * 2 + 2,"",
1849 (int)( ( TRIE_CHARCOUNT(trie) + 1 ) * trie->uniquecharcount + 1 ),
1852 ( ( next_alloc - pos ) * 100 ) / (double)next_alloc );
1855 } /* end table compress */
1857 DEBUG_TRIE_COMPILE_MORE_r(
1858 PerlIO_printf(Perl_debug_log, "%*sStatecount:%"UVxf" Lasttrans:%"UVxf"\n",
1859 (int)depth * 2 + 2, "",
1860 (UV)trie->statecount,
1861 (UV)trie->lasttrans)
1863 /* resize the trans array to remove unused space */
1864 trie->trans = (reg_trie_trans *)
1865 PerlMemShared_realloc( trie->trans, trie->lasttrans
1866 * sizeof(reg_trie_trans) );
1868 /* and now dump out the compressed format */
1869 DEBUG_TRIE_COMPILE_r(dump_trie(trie, widecharmap, revcharmap, depth+1));
1871 { /* Modify the program and insert the new TRIE node*/
1872 U8 nodetype =(U8)(flags & 0xFF);
1876 regnode *optimize = NULL;
1877 #ifdef RE_TRACK_PATTERN_OFFSETS
1880 U32 mjd_nodelen = 0;
1881 #endif /* RE_TRACK_PATTERN_OFFSETS */
1882 #endif /* DEBUGGING */
1884 This means we convert either the first branch or the first Exact,
1885 depending on whether the thing following (in 'last') is a branch
1886 or not and whther first is the startbranch (ie is it a sub part of
1887 the alternation or is it the whole thing.)
1888 Assuming its a sub part we conver the EXACT otherwise we convert
1889 the whole branch sequence, including the first.
1891 /* Find the node we are going to overwrite */
1892 if ( first != startbranch || OP( last ) == BRANCH ) {
1893 /* branch sub-chain */
1894 NEXT_OFF( first ) = (U16)(last - first);
1895 #ifdef RE_TRACK_PATTERN_OFFSETS
1897 mjd_offset= Node_Offset((convert));
1898 mjd_nodelen= Node_Length((convert));
1901 /* whole branch chain */
1903 #ifdef RE_TRACK_PATTERN_OFFSETS
1906 const regnode *nop = NEXTOPER( convert );
1907 mjd_offset= Node_Offset((nop));
1908 mjd_nodelen= Node_Length((nop));
1912 PerlIO_printf(Perl_debug_log, "%*sMJD offset:%"UVuf" MJD length:%"UVuf"\n",
1913 (int)depth * 2 + 2, "",
1914 (UV)mjd_offset, (UV)mjd_nodelen)
1917 /* But first we check to see if there is a common prefix we can
1918 split out as an EXACT and put in front of the TRIE node. */
1919 trie->startstate= 1;
1920 if ( trie->bitmap && !widecharmap && !trie->jump ) {
1922 for ( state = 1 ; state < trie->statecount-1 ; state++ ) {
1926 const U32 base = trie->states[ state ].trans.base;
1928 if ( trie->states[state].wordnum )
1931 for ( ofs = 0 ; ofs < trie->uniquecharcount ; ofs++ ) {
1932 if ( ( base + ofs >= trie->uniquecharcount ) &&
1933 ( base + ofs - trie->uniquecharcount < trie->lasttrans ) &&
1934 trie->trans[ base + ofs - trie->uniquecharcount ].check == state )
1936 if ( ++count > 1 ) {
1937 SV **tmp = av_fetch( revcharmap, ofs, 0);
1938 const U8 *ch = (U8*)SvPV_nolen_const( *tmp );
1939 if ( state == 1 ) break;
1941 Zero(trie->bitmap, ANYOF_BITMAP_SIZE, char);
1943 PerlIO_printf(Perl_debug_log,
1944 "%*sNew Start State=%"UVuf" Class: [",
1945 (int)depth * 2 + 2, "",
1948 SV ** const tmp = av_fetch( revcharmap, idx, 0);
1949 const U8 * const ch = (U8*)SvPV_nolen_const( *tmp );
1951 TRIE_BITMAP_SET(trie,*ch);
1953 TRIE_BITMAP_SET(trie, folder[ *ch ]);
1955 PerlIO_printf(Perl_debug_log, (char*)ch)
1959 TRIE_BITMAP_SET(trie,*ch);
1961 TRIE_BITMAP_SET(trie,folder[ *ch ]);
1962 DEBUG_OPTIMISE_r(PerlIO_printf( Perl_debug_log,"%s", ch));
1968 SV **tmp = av_fetch( revcharmap, idx, 0);
1969 char *ch = SvPV_nolen( *tmp );
1971 SV *sv=sv_newmortal();
1972 PerlIO_printf( Perl_debug_log,
1973 "%*sPrefix State: %"UVuf" Idx:%"UVuf" Char='%s'\n",
1974 (int)depth * 2 + 2, "",
1976 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), 6,
1977 PL_colors[0], PL_colors[1],
1978 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
1979 PERL_PV_ESCAPE_FIRSTCHAR
1984 OP( convert ) = nodetype;
1985 str=STRING(convert);
1996 DEBUG_OPTIMISE_r(PerlIO_printf( Perl_debug_log,"]\n"));
2002 regnode *n = convert+NODE_SZ_STR(convert);
2003 NEXT_OFF(convert) = NODE_SZ_STR(convert);
2004 trie->startstate = state;
2005 trie->minlen -= (state - 1);
2006 trie->maxlen -= (state - 1);
2008 regnode *fix = convert;
2009 U32 word = trie->wordcount;
2011 Set_Node_Offset_Length(convert, mjd_offset, state - 1);
2012 while( ++fix < n ) {
2013 Set_Node_Offset_Length(fix, 0, 0);
2016 SV ** const tmp = av_fetch( trie_words, word, 0 );
2018 if ( STR_LEN(convert) <= SvCUR(*tmp) )
2019 sv_chop(*tmp, SvPV_nolen(*tmp) + STR_LEN(convert));
2021 sv_chop(*tmp, SvPV_nolen(*tmp) + SvCUR(*tmp));
2028 NEXT_OFF(convert) = (U16)(tail - convert);
2029 DEBUG_r(optimize= n);
2035 if ( trie->maxlen ) {
2036 NEXT_OFF( convert ) = (U16)(tail - convert);
2037 ARG_SET( convert, data_slot );
2038 /* Store the offset to the first unabsorbed branch in
2039 jump[0], which is otherwise unused by the jump logic.
2040 We use this when dumping a trie and during optimisation. */
2042 trie->jump[0] = (U16)(nextbranch - convert);
2045 if ( !trie->states[trie->startstate].wordnum && trie->bitmap &&
2046 ( (char *)jumper - (char *)convert) >= (int)sizeof(struct regnode_charclass) )
2048 OP( convert ) = TRIEC;
2049 Copy(trie->bitmap, ((struct regnode_charclass *)convert)->bitmap, ANYOF_BITMAP_SIZE, char);
2050 PerlMemShared_free(trie->bitmap);
2053 OP( convert ) = TRIE;
2055 /* store the type in the flags */
2056 convert->flags = nodetype;
2060 + regarglen[ OP( convert ) ];
2062 /* XXX We really should free up the resource in trie now,
2063 as we won't use them - (which resources?) dmq */
2065 /* needed for dumping*/
2066 DEBUG_r(if (optimize) {
2067 regnode *opt = convert;
2069 while ( ++opt < optimize) {
2070 Set_Node_Offset_Length(opt,0,0);
2073 Try to clean up some of the debris left after the
2076 while( optimize < jumper ) {
2077 mjd_nodelen += Node_Length((optimize));
2078 OP( optimize ) = OPTIMIZED;
2079 Set_Node_Offset_Length(optimize,0,0);
2082 Set_Node_Offset_Length(convert,mjd_offset,mjd_nodelen);
2084 } /* end node insert */
2085 RExC_rxi->data->data[ data_slot + 1 ] = (void*)widecharmap;
2087 RExC_rxi->data->data[ data_slot + TRIE_WORDS_OFFSET ] = (void*)trie_words;
2088 RExC_rxi->data->data[ data_slot + 3 ] = (void*)revcharmap;
2090 SvREFCNT_dec(revcharmap);
2094 : trie->startstate>1
2100 S_make_trie_failtable(pTHX_ RExC_state_t *pRExC_state, regnode *source, regnode *stclass, U32 depth)
2102 /* The Trie is constructed and compressed now so we can build a fail array now if its needed
2104 This is basically the Aho-Corasick algorithm. Its from exercise 3.31 and 3.32 in the
2105 "Red Dragon" -- Compilers, principles, techniques, and tools. Aho, Sethi, Ullman 1985/88
2108 We find the fail state for each state in the trie, this state is the longest proper
2109 suffix of the current states 'word' that is also a proper prefix of another word in our
2110 trie. State 1 represents the word '' and is the thus the default fail state. This allows
2111 the DFA not to have to restart after its tried and failed a word at a given point, it
2112 simply continues as though it had been matching the other word in the first place.
2114 'abcdgu'=~/abcdefg|cdgu/
2115 When we get to 'd' we are still matching the first word, we would encounter 'g' which would
2116 fail, which would bring use to the state representing 'd' in the second word where we would
2117 try 'g' and succeed, prodceding to match 'cdgu'.
2119 /* add a fail transition */
2120 const U32 trie_offset = ARG(source);
2121 reg_trie_data *trie=(reg_trie_data *)RExC_rxi->data->data[trie_offset];
2123 const U32 ucharcount = trie->uniquecharcount;
2124 const U32 numstates = trie->statecount;
2125 const U32 ubound = trie->lasttrans + ucharcount;
2129 U32 base = trie->states[ 1 ].trans.base;
2132 const U32 data_slot = add_data( pRExC_state, 1, "T" );
2133 GET_RE_DEBUG_FLAGS_DECL;
2135 PERL_UNUSED_ARG(depth);
2139 ARG_SET( stclass, data_slot );
2140 aho = (reg_ac_data *) PerlMemShared_calloc( 1, sizeof(reg_ac_data) );
2141 RExC_rxi->data->data[ data_slot ] = (void*)aho;
2142 aho->trie=trie_offset;
2143 aho->states=(reg_trie_state *)PerlMemShared_malloc( numstates * sizeof(reg_trie_state) );
2144 Copy( trie->states, aho->states, numstates, reg_trie_state );
2145 Newxz( q, numstates, U32);
2146 aho->fail = (U32 *) PerlMemShared_calloc( numstates, sizeof(U32) );
2149 /* initialize fail[0..1] to be 1 so that we always have
2150 a valid final fail state */
2151 fail[ 0 ] = fail[ 1 ] = 1;
2153 for ( charid = 0; charid < ucharcount ; charid++ ) {
2154 const U32 newstate = TRIE_TRANS_STATE( 1, base, ucharcount, charid, 0 );
2156 q[ q_write ] = newstate;
2157 /* set to point at the root */
2158 fail[ q[ q_write++ ] ]=1;
2161 while ( q_read < q_write) {
2162 const U32 cur = q[ q_read++ % numstates ];
2163 base = trie->states[ cur ].trans.base;
2165 for ( charid = 0 ; charid < ucharcount ; charid++ ) {
2166 const U32 ch_state = TRIE_TRANS_STATE( cur, base, ucharcount, charid, 1 );
2168 U32 fail_state = cur;
2171 fail_state = fail[ fail_state ];
2172 fail_base = aho->states[ fail_state ].trans.base;
2173 } while ( !TRIE_TRANS_STATE( fail_state, fail_base, ucharcount, charid, 1 ) );
2175 fail_state = TRIE_TRANS_STATE( fail_state, fail_base, ucharcount, charid, 1 );
2176 fail[ ch_state ] = fail_state;
2177 if ( !aho->states[ ch_state ].wordnum && aho->states[ fail_state ].wordnum )
2179 aho->states[ ch_state ].wordnum = aho->states[ fail_state ].wordnum;
2181 q[ q_write++ % numstates] = ch_state;
2185 /* restore fail[0..1] to 0 so that we "fall out" of the AC loop
2186 when we fail in state 1, this allows us to use the
2187 charclass scan to find a valid start char. This is based on the principle
2188 that theres a good chance the string being searched contains lots of stuff
2189 that cant be a start char.
2191 fail[ 0 ] = fail[ 1 ] = 0;
2192 DEBUG_TRIE_COMPILE_r({
2193 PerlIO_printf(Perl_debug_log,
2194 "%*sStclass Failtable (%"UVuf" states): 0",
2195 (int)(depth * 2), "", (UV)numstates
2197 for( q_read=1; q_read<numstates; q_read++ ) {
2198 PerlIO_printf(Perl_debug_log, ", %"UVuf, (UV)fail[q_read]);
2200 PerlIO_printf(Perl_debug_log, "\n");
2203 /*RExC_seen |= REG_SEEN_TRIEDFA;*/
2208 * There are strange code-generation bugs caused on sparc64 by gcc-2.95.2.
2209 * These need to be revisited when a newer toolchain becomes available.
2211 #if defined(__sparc64__) && defined(__GNUC__)
2212 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
2213 # undef SPARC64_GCC_WORKAROUND
2214 # define SPARC64_GCC_WORKAROUND 1
2218 #define DEBUG_PEEP(str,scan,depth) \
2219 DEBUG_OPTIMISE_r({if (scan){ \
2220 SV * const mysv=sv_newmortal(); \
2221 regnode *Next = regnext(scan); \
2222 regprop(RExC_rx, mysv, scan); \
2223 PerlIO_printf(Perl_debug_log, "%*s" str ">%3d: %s (%d)\n", \
2224 (int)depth*2, "", REG_NODE_NUM(scan), SvPV_nolen_const(mysv),\
2225 Next ? (REG_NODE_NUM(Next)) : 0 ); \
2232 #define JOIN_EXACT(scan,min,flags) \
2233 if (PL_regkind[OP(scan)] == EXACT) \
2234 join_exact(pRExC_state,(scan),(min),(flags),NULL,depth+1)
2237 S_join_exact(pTHX_ RExC_state_t *pRExC_state, regnode *scan, I32 *min, U32 flags,regnode *val, U32 depth) {
2238 /* Merge several consecutive EXACTish nodes into one. */
2239 regnode *n = regnext(scan);
2241 regnode *next = scan + NODE_SZ_STR(scan);
2245 regnode *stop = scan;
2246 GET_RE_DEBUG_FLAGS_DECL;
2248 PERL_UNUSED_ARG(depth);
2250 #ifndef EXPERIMENTAL_INPLACESCAN
2251 PERL_UNUSED_ARG(flags);
2252 PERL_UNUSED_ARG(val);
2254 DEBUG_PEEP("join",scan,depth);
2256 /* Skip NOTHING, merge EXACT*. */
2258 ( PL_regkind[OP(n)] == NOTHING ||
2259 (stringok && (OP(n) == OP(scan))))
2261 && NEXT_OFF(scan) + NEXT_OFF(n) < I16_MAX) {
2263 if (OP(n) == TAIL || n > next)
2265 if (PL_regkind[OP(n)] == NOTHING) {
2266 DEBUG_PEEP("skip:",n,depth);
2267 NEXT_OFF(scan) += NEXT_OFF(n);
2268 next = n + NODE_STEP_REGNODE;
2275 else if (stringok) {
2276 const unsigned int oldl = STR_LEN(scan);
2277 regnode * const nnext = regnext(n);
2279 DEBUG_PEEP("merg",n,depth);
2282 if (oldl + STR_LEN(n) > U8_MAX)
2284 NEXT_OFF(scan) += NEXT_OFF(n);
2285 STR_LEN(scan) += STR_LEN(n);
2286 next = n + NODE_SZ_STR(n);
2287 /* Now we can overwrite *n : */
2288 Move(STRING(n), STRING(scan) + oldl, STR_LEN(n), char);
2296 #ifdef EXPERIMENTAL_INPLACESCAN
2297 if (flags && !NEXT_OFF(n)) {
2298 DEBUG_PEEP("atch", val, depth);
2299 if (reg_off_by_arg[OP(n)]) {
2300 ARG_SET(n, val - n);
2303 NEXT_OFF(n) = val - n;
2310 if (UTF && ( OP(scan) == EXACTF ) && ( STR_LEN(scan) >= 6 ) ) {
2312 Two problematic code points in Unicode casefolding of EXACT nodes:
2314 U+0390 - GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS
2315 U+03B0 - GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS
2321 U+03B9 U+0308 U+0301 0xCE 0xB9 0xCC 0x88 0xCC 0x81
2322 U+03C5 U+0308 U+0301 0xCF 0x85 0xCC 0x88 0xCC 0x81
2324 This means that in case-insensitive matching (or "loose matching",
2325 as Unicode calls it), an EXACTF of length six (the UTF-8 encoded byte
2326 length of the above casefolded versions) can match a target string
2327 of length two (the byte length of UTF-8 encoded U+0390 or U+03B0).
2328 This would rather mess up the minimum length computation.
2330 What we'll do is to look for the tail four bytes, and then peek
2331 at the preceding two bytes to see whether we need to decrease
2332 the minimum length by four (six minus two).
2334 Thanks to the design of UTF-8, there cannot be false matches:
2335 A sequence of valid UTF-8 bytes cannot be a subsequence of
2336 another valid sequence of UTF-8 bytes.
2339 char * const s0 = STRING(scan), *s, *t;
2340 char * const s1 = s0 + STR_LEN(scan) - 1;
2341 char * const s2 = s1 - 4;
2342 #ifdef EBCDIC /* RD tunifold greek 0390 and 03B0 */
2343 const char t0[] = "\xaf\x49\xaf\x42";
2345 const char t0[] = "\xcc\x88\xcc\x81";
2347 const char * const t1 = t0 + 3;
2350 s < s2 && (t = ninstr(s, s1, t0, t1));
2353 if (((U8)t[-1] == 0x68 && (U8)t[-2] == 0xB4) ||
2354 ((U8)t[-1] == 0x46 && (U8)t[-2] == 0xB5))
2356 if (((U8)t[-1] == 0xB9 && (U8)t[-2] == 0xCE) ||
2357 ((U8)t[-1] == 0x85 && (U8)t[-2] == 0xCF))
2365 n = scan + NODE_SZ_STR(scan);
2367 if (PL_regkind[OP(n)] != NOTHING || OP(n) == NOTHING) {
2374 DEBUG_OPTIMISE_r(if (merged){DEBUG_PEEP("finl",scan,depth)});
2378 /* REx optimizer. Converts nodes into quickier variants "in place".
2379 Finds fixed substrings. */
2381 /* Stops at toplevel WHILEM as well as at "last". At end *scanp is set
2382 to the position after last scanned or to NULL. */
2384 #define INIT_AND_WITHP \
2385 assert(!and_withp); \
2386 Newx(and_withp,1,struct regnode_charclass_class); \
2387 SAVEFREEPV(and_withp)
2389 /* this is a chain of data about sub patterns we are processing that
2390 need to be handled seperately/specially in study_chunk. Its so
2391 we can simulate recursion without losing state. */
2393 typedef struct scan_frame {
2394 regnode *last; /* last node to process in this frame */
2395 regnode *next; /* next node to process when last is reached */
2396 struct scan_frame *prev; /*previous frame*/
2397 I32 stop; /* what stopparen do we use */
2401 #define SCAN_COMMIT(s, data, m) scan_commit(s, data, m, is_inf)
2404 S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp,
2405 I32 *minlenp, I32 *deltap,
2410 struct regnode_charclass_class *and_withp,
2411 U32 flags, U32 depth)
2412 /* scanp: Start here (read-write). */
2413 /* deltap: Write maxlen-minlen here. */
2414 /* last: Stop before this one. */
2415 /* data: string data about the pattern */
2416 /* stopparen: treat close N as END */
2417 /* recursed: which subroutines have we recursed into */
2418 /* and_withp: Valid if flags & SCF_DO_STCLASS_OR */
2421 I32 min = 0, pars = 0, code;
2422 regnode *scan = *scanp, *next;
2424 int is_inf = (flags & SCF_DO_SUBSTR) && (data->flags & SF_IS_INF);
2425 int is_inf_internal = 0; /* The studied chunk is infinite */
2426 I32 is_par = OP(scan) == OPEN ? ARG(scan) : 0;
2427 scan_data_t data_fake;
2428 SV *re_trie_maxbuff = NULL;
2429 regnode *first_non_open = scan;
2430 I32 stopmin = I32_MAX;
2431 scan_frame *frame = NULL;
2433 GET_RE_DEBUG_FLAGS_DECL;
2436 StructCopy(&zero_scan_data, &data_fake, scan_data_t);
2440 while (first_non_open && OP(first_non_open) == OPEN)
2441 first_non_open=regnext(first_non_open);
2446 while ( scan && OP(scan) != END && scan < last ){
2447 /* Peephole optimizer: */
2448 DEBUG_STUDYDATA("Peep:", data,depth);
2449 DEBUG_PEEP("Peep",scan,depth);
2450 JOIN_EXACT(scan,&min,0);
2452 /* Follow the next-chain of the current node and optimize
2453 away all the NOTHINGs from it. */
2454 if (OP(scan) != CURLYX) {
2455 const int max = (reg_off_by_arg[OP(scan)]
2457 /* I32 may be smaller than U16 on CRAYs! */
2458 : (I32_MAX < U16_MAX ? I32_MAX : U16_MAX));
2459 int off = (reg_off_by_arg[OP(scan)] ? ARG(scan) : NEXT_OFF(scan));
2463 /* Skip NOTHING and LONGJMP. */
2464 while ((n = regnext(n))
2465 && ((PL_regkind[OP(n)] == NOTHING && (noff = NEXT_OFF(n)))
2466 || ((OP(n) == LONGJMP) && (noff = ARG(n))))
2467 && off + noff < max)
2469 if (reg_off_by_arg[OP(scan)])
2472 NEXT_OFF(scan) = off;
2477 /* The principal pseudo-switch. Cannot be a switch, since we
2478 look into several different things. */
2479 if (OP(scan) == BRANCH || OP(scan) == BRANCHJ
2480 || OP(scan) == IFTHEN) {
2481 next = regnext(scan);
2483 /* demq: the op(next)==code check is to see if we have "branch-branch" AFAICT */
2485 if (OP(next) == code || code == IFTHEN) {
2486 /* NOTE - There is similar code to this block below for handling
2487 TRIE nodes on a re-study. If you change stuff here check there
2489 I32 max1 = 0, min1 = I32_MAX, num = 0;
2490 struct regnode_charclass_class accum;
2491 regnode * const startbranch=scan;
2493 if (flags & SCF_DO_SUBSTR)
2494 SCAN_COMMIT(pRExC_state, data, minlenp); /* Cannot merge strings after this. */
2495 if (flags & SCF_DO_STCLASS)
2496 cl_init_zero(pRExC_state, &accum);
2498 while (OP(scan) == code) {
2499 I32 deltanext, minnext, f = 0, fake;
2500 struct regnode_charclass_class this_class;
2503 data_fake.flags = 0;
2505 data_fake.whilem_c = data->whilem_c;
2506 data_fake.last_closep = data->last_closep;
2509 data_fake.last_closep = &fake;
2511 data_fake.pos_delta = delta;
2512 next = regnext(scan);
2513 scan = NEXTOPER(scan);
2515 scan = NEXTOPER(scan);
2516 if (flags & SCF_DO_STCLASS) {
2517 cl_init(pRExC_state, &this_class);
2518 data_fake.start_class = &this_class;
2519 f = SCF_DO_STCLASS_AND;
2521 if (flags & SCF_WHILEM_VISITED_POS)
2522 f |= SCF_WHILEM_VISITED_POS;
2524 /* we suppose the run is continuous, last=next...*/
2525 minnext = study_chunk(pRExC_state, &scan, minlenp, &deltanext,
2527 stopparen, recursed, NULL, f,depth+1);
2530 if (max1 < minnext + deltanext)
2531 max1 = minnext + deltanext;
2532 if (deltanext == I32_MAX)
2533 is_inf = is_inf_internal = 1;
2535 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
2537 if (data_fake.flags & SCF_SEEN_ACCEPT) {
2538 if ( stopmin > minnext)
2539 stopmin = min + min1;
2540 flags &= ~SCF_DO_SUBSTR;
2542 data->flags |= SCF_SEEN_ACCEPT;
2545 if (data_fake.flags & SF_HAS_EVAL)
2546 data->flags |= SF_HAS_EVAL;
2547 data->whilem_c = data_fake.whilem_c;
2549 if (flags & SCF_DO_STCLASS)
2550 cl_or(pRExC_state, &accum, &this_class);
2552 if (code == IFTHEN && num < 2) /* Empty ELSE branch */
2554 if (flags & SCF_DO_SUBSTR) {
2555 data->pos_min += min1;
2556 data->pos_delta += max1 - min1;
2557 if (max1 != min1 || is_inf)
2558 data->longest = &(data->longest_float);
2561 delta += max1 - min1;
2562 if (flags & SCF_DO_STCLASS_OR) {
2563 cl_or(pRExC_state, data->start_class, &accum);
2565 cl_and(data->start_class, and_withp);
2566 flags &= ~SCF_DO_STCLASS;
2569 else if (flags & SCF_DO_STCLASS_AND) {
2571 cl_and(data->start_class, &accum);
2572 flags &= ~SCF_DO_STCLASS;
2575 /* Switch to OR mode: cache the old value of
2576 * data->start_class */
2578 StructCopy(data->start_class, and_withp,
2579 struct regnode_charclass_class);
2580 flags &= ~SCF_DO_STCLASS_AND;
2581 StructCopy(&accum, data->start_class,
2582 struct regnode_charclass_class);
2583 flags |= SCF_DO_STCLASS_OR;
2584 data->start_class->flags |= ANYOF_EOS;
2588 if (PERL_ENABLE_TRIE_OPTIMISATION && OP( startbranch ) == BRANCH ) {
2591 Assuming this was/is a branch we are dealing with: 'scan' now
2592 points at the item that follows the branch sequence, whatever
2593 it is. We now start at the beginning of the sequence and look
2600 which would be constructed from a pattern like /A|LIST|OF|WORDS/
2602 If we can find such a subseqence we need to turn the first
2603 element into a trie and then add the subsequent branch exact
2604 strings to the trie.
2608 1. patterns where the whole set of branch can be converted.
2610 2. patterns where only a subset can be converted.
2612 In case 1 we can replace the whole set with a single regop
2613 for the trie. In case 2 we need to keep the start and end
2616 'BRANCH EXACT; BRANCH EXACT; BRANCH X'
2617 becomes BRANCH TRIE; BRANCH X;
2619 There is an additional case, that being where there is a
2620 common prefix, which gets split out into an EXACT like node
2621 preceding the TRIE node.
2623 If x(1..n)==tail then we can do a simple trie, if not we make
2624 a "jump" trie, such that when we match the appropriate word
2625 we "jump" to the appopriate tail node. Essentailly we turn
2626 a nested if into a case structure of sorts.
2631 if (!re_trie_maxbuff) {
2632 re_trie_maxbuff = get_sv(RE_TRIE_MAXBUF_NAME, 1);
2633 if (!SvIOK(re_trie_maxbuff))
2634 sv_setiv(re_trie_maxbuff, RE_TRIE_MAXBUF_INIT);
2636 if ( SvIV(re_trie_maxbuff)>=0 ) {
2638 regnode *first = (regnode *)NULL;
2639 regnode *last = (regnode *)NULL;
2640 regnode *tail = scan;
2645 SV * const mysv = sv_newmortal(); /* for dumping */
2647 /* var tail is used because there may be a TAIL
2648 regop in the way. Ie, the exacts will point to the
2649 thing following the TAIL, but the last branch will
2650 point at the TAIL. So we advance tail. If we
2651 have nested (?:) we may have to move through several
2655 while ( OP( tail ) == TAIL ) {
2656 /* this is the TAIL generated by (?:) */
2657 tail = regnext( tail );
2662 regprop(RExC_rx, mysv, tail );
2663 PerlIO_printf( Perl_debug_log, "%*s%s%s\n",
2664 (int)depth * 2 + 2, "",
2665 "Looking for TRIE'able sequences. Tail node is: ",
2666 SvPV_nolen_const( mysv )
2672 step through the branches, cur represents each
2673 branch, noper is the first thing to be matched
2674 as part of that branch and noper_next is the
2675 regnext() of that node. if noper is an EXACT
2676 and noper_next is the same as scan (our current
2677 position in the regex) then the EXACT branch is
2678 a possible optimization target. Once we have
2679 two or more consequetive such branches we can
2680 create a trie of the EXACT's contents and stich
2681 it in place. If the sequence represents all of
2682 the branches we eliminate the whole thing and
2683 replace it with a single TRIE. If it is a
2684 subsequence then we need to stitch it in. This
2685 means the first branch has to remain, and needs
2686 to be repointed at the item on the branch chain
2687 following the last branch optimized. This could
2688 be either a BRANCH, in which case the
2689 subsequence is internal, or it could be the
2690 item following the branch sequence in which
2691 case the subsequence is at the end.
2695 /* dont use tail as the end marker for this traverse */
2696 for ( cur = startbranch ; cur != scan ; cur = regnext( cur ) ) {
2697 regnode * const noper = NEXTOPER( cur );
2698 #if defined(DEBUGGING) || defined(NOJUMPTRIE)
2699 regnode * const noper_next = regnext( noper );
2703 regprop(RExC_rx, mysv, cur);
2704 PerlIO_printf( Perl_debug_log, "%*s- %s (%d)",
2705 (int)depth * 2 + 2,"", SvPV_nolen_const( mysv ), REG_NODE_NUM(cur) );
2707 regprop(RExC_rx, mysv, noper);
2708 PerlIO_printf( Perl_debug_log, " -> %s",
2709 SvPV_nolen_const(mysv));
2712 regprop(RExC_rx, mysv, noper_next );
2713 PerlIO_printf( Perl_debug_log,"\t=> %s\t",
2714 SvPV_nolen_const(mysv));
2716 PerlIO_printf( Perl_debug_log, "(First==%d,Last==%d,Cur==%d)\n",
2717 REG_NODE_NUM(first), REG_NODE_NUM(last), REG_NODE_NUM(cur) );
2719 if ( (((first && optype!=NOTHING) ? OP( noper ) == optype
2720 : PL_regkind[ OP( noper ) ] == EXACT )
2721 || OP(noper) == NOTHING )
2723 && noper_next == tail
2728 if ( !first || optype == NOTHING ) {
2729 if (!first) first = cur;
2730 optype = OP( noper );
2736 make_trie( pRExC_state,
2737 startbranch, first, cur, tail, count,
2740 if ( PL_regkind[ OP( noper ) ] == EXACT
2742 && noper_next == tail
2747 optype = OP( noper );
2757 regprop(RExC_rx, mysv, cur);
2758 PerlIO_printf( Perl_debug_log,
2759 "%*s- %s (%d) <SCAN FINISHED>\n", (int)depth * 2 + 2,
2760 "", SvPV_nolen_const( mysv ),REG_NODE_NUM(cur));
2764 made= make_trie( pRExC_state, startbranch, first, scan, tail, count, optype, depth+1 );
2765 #ifdef TRIE_STUDY_OPT
2766 if ( ((made == MADE_EXACT_TRIE &&
2767 startbranch == first)
2768 || ( first_non_open == first )) &&
2770 flags |= SCF_TRIE_RESTUDY;
2771 if ( startbranch == first
2774 RExC_seen &=~REG_TOP_LEVEL_BRANCHES;
2784 else if ( code == BRANCHJ ) { /* single branch is optimized. */
2785 scan = NEXTOPER(NEXTOPER(scan));
2786 } else /* single branch is optimized. */
2787 scan = NEXTOPER(scan);
2789 } else if (OP(scan) == SUSPEND || OP(scan) == GOSUB || OP(scan) == GOSTART) {
2790 scan_frame *newframe = NULL;
2795 if (OP(scan) != SUSPEND) {
2796 /* set the pointer */
2797 if (OP(scan) == GOSUB) {
2799 RExC_recurse[ARG2L(scan)] = scan;
2800 start = RExC_open_parens[paren-1];
2801 end = RExC_close_parens[paren-1];
2804 start = RExC_rxi->program + 1;
2808 Newxz(recursed, (((RExC_npar)>>3) +1), U8);
2809 SAVEFREEPV(recursed);
2811 if (!PAREN_TEST(recursed,paren+1)) {
2812 PAREN_SET(recursed,paren+1);
2813 Newx(newframe,1,scan_frame);
2815 if (flags & SCF_DO_SUBSTR) {
2816 SCAN_COMMIT(pRExC_state,data,minlenp);
2817 data->longest = &(data->longest_float);
2819 is_inf = is_inf_internal = 1;
2820 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
2821 cl_anything(pRExC_state, data->start_class);
2822 flags &= ~SCF_DO_STCLASS;
2825 Newx(newframe,1,scan_frame);
2828 end = regnext(scan);
2833 SAVEFREEPV(newframe);
2834 newframe->next = regnext(scan);
2835 newframe->last = last;
2836 newframe->stop = stopparen;
2837 newframe->prev = frame;
2847 else if (OP(scan) == EXACT) {
2848 I32 l = STR_LEN(scan);
2851 const U8 * const s = (U8*)STRING(scan);
2852 l = utf8_length(s, s + l);
2853 uc = utf8_to_uvchr(s, NULL);
2855 uc = *((U8*)STRING(scan));
2858 if (flags & SCF_DO_SUBSTR) { /* Update longest substr. */
2859 /* The code below prefers earlier match for fixed
2860 offset, later match for variable offset. */
2861 if (data->last_end == -1) { /* Update the start info. */
2862 data->last_start_min = data->pos_min;
2863 data->last_start_max = is_inf
2864 ? I32_MAX : data->pos_min + data->pos_delta;
2866 sv_catpvn(data->last_found, STRING(scan), STR_LEN(scan));
2868 SvUTF8_on(data->last_found);
2870 SV * const sv = data->last_found;
2871 MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
2872 mg_find(sv, PERL_MAGIC_utf8) : NULL;
2873 if (mg && mg->mg_len >= 0)
2874 mg->mg_len += utf8_length((U8*)STRING(scan),
2875 (U8*)STRING(scan)+STR_LEN(scan));
2877 data->last_end = data->pos_min + l;
2878 data->pos_min += l; /* As in the first entry. */
2879 data->flags &= ~SF_BEFORE_EOL;
2881 if (flags & SCF_DO_STCLASS_AND) {
2882 /* Check whether it is compatible with what we know already! */
2886 (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
2887 && !ANYOF_BITMAP_TEST(data->start_class, uc)
2888 && (!(data->start_class->flags & ANYOF_FOLD)
2889 || !ANYOF_BITMAP_TEST(data->start_class, PL_fold[uc])))
2892 ANYOF_CLASS_ZERO(data->start_class);
2893 ANYOF_BITMAP_ZERO(data->start_class);
2895 ANYOF_BITMAP_SET(data->start_class, uc);
2896 data->start_class->flags &= ~ANYOF_EOS;
2898 data->start_class->flags &= ~ANYOF_UNICODE_ALL;
2900 else if (flags & SCF_DO_STCLASS_OR) {
2901 /* false positive possible if the class is case-folded */
2903 ANYOF_BITMAP_SET(data->start_class, uc);
2905 data->start_class->flags |= ANYOF_UNICODE_ALL;
2906 data->start_class->flags &= ~ANYOF_EOS;
2907 cl_and(data->start_class, and_withp);
2909 flags &= ~SCF_DO_STCLASS;
2911 else if (PL_regkind[OP(scan)] == EXACT) { /* But OP != EXACT! */
2912 I32 l = STR_LEN(scan);
2913 UV uc = *((U8*)STRING(scan));
2915 /* Search for fixed substrings supports EXACT only. */
2916 if (flags & SCF_DO_SUBSTR) {
2918 SCAN_COMMIT(pRExC_state, data, minlenp);
2921 const U8 * const s = (U8 *)STRING(scan);
2922 l = utf8_length(s, s + l);
2923 uc = utf8_to_uvchr(s, NULL);
2926 if (flags & SCF_DO_SUBSTR)
2928 if (flags & SCF_DO_STCLASS_AND) {
2929 /* Check whether it is compatible with what we know already! */
2933 (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
2934 && !ANYOF_BITMAP_TEST(data->start_class, uc)
2935 && !ANYOF_BITMAP_TEST(data->start_class, PL_fold[uc])))
2937 ANYOF_CLASS_ZERO(data->start_class);
2938 ANYOF_BITMAP_ZERO(data->start_class);
2940 ANYOF_BITMAP_SET(data->start_class, uc);
2941 data->start_class->flags &= ~ANYOF_EOS;
2942 data->start_class->flags |= ANYOF_FOLD;
2943 if (OP(scan) == EXACTFL)
2944 data->start_class->flags |= ANYOF_LOCALE;
2947 else if (flags & SCF_DO_STCLASS_OR) {
2948 if (data->start_class->flags & ANYOF_FOLD) {
2949 /* false positive possible if the class is case-folded.
2950 Assume that the locale settings are the same... */
2952 ANYOF_BITMAP_SET(data->start_class, uc);
2953 data->start_class->flags &= ~ANYOF_EOS;
2955 cl_and(data->start_class, and_withp);
2957 flags &= ~SCF_DO_STCLASS;
2959 else if (strchr((const char*)PL_varies,OP(scan))) {
2960 I32 mincount, maxcount, minnext, deltanext, fl = 0;
2961 I32 f = flags, pos_before = 0;
2962 regnode * const oscan = scan;
2963 struct regnode_charclass_class this_class;
2964 struct regnode_charclass_class *oclass = NULL;
2965 I32 next_is_eval = 0;
2967 switch (PL_regkind[OP(scan)]) {
2968 case WHILEM: /* End of (?:...)* . */
2969 scan = NEXTOPER(scan);
2972 if (flags & (SCF_DO_SUBSTR | SCF_DO_STCLASS)) {
2973 next = NEXTOPER(scan);
2974 if (OP(next) == EXACT || (flags & SCF_DO_STCLASS)) {
2976 maxcount = REG_INFTY;
2977 next = regnext(scan);
2978 scan = NEXTOPER(scan);
2982 if (flags & SCF_DO_SUBSTR)
2987 if (flags & SCF_DO_STCLASS) {
2989 maxcount = REG_INFTY;
2990 next = regnext(scan);
2991 scan = NEXTOPER(scan);
2994 is_inf = is_inf_internal = 1;
2995 scan = regnext(scan);
2996 if (flags & SCF_DO_SUBSTR) {
2997 SCAN_COMMIT(pRExC_state, data, minlenp); /* Cannot extend fixed substrings */
2998 data->longest = &(data->longest_float);
3000 goto optimize_curly_tail;
3002 if (stopparen>0 && (OP(scan)==CURLYN || OP(scan)==CURLYM)
3003 && (scan->flags == stopparen))
3008 mincount = ARG1(scan);
3009 maxcount = ARG2(scan);
3011 next = regnext(scan);
3012 if (OP(scan) == CURLYX) {
3013 I32 lp = (data ? *(data->last_closep) : 0);
3014 scan->flags = ((lp <= (I32)U8_MAX) ? (U8)lp : U8_MAX);
3016 scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS;
3017 next_is_eval = (OP(scan) == EVAL);
3019 if (flags & SCF_DO_SUBSTR) {
3020 if (mincount == 0) SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot extend fixed substrings */
3021 pos_before = data->pos_min;
3025 data->flags &= ~(SF_HAS_PAR|SF_IN_PAR|SF_HAS_EVAL);
3027 data->flags |= SF_IS_INF;
3029 if (flags & SCF_DO_STCLASS) {
3030 cl_init(pRExC_state, &this_class);
3031 oclass = data->start_class;
3032 data->start_class = &this_class;
3033 f |= SCF_DO_STCLASS_AND;
3034 f &= ~SCF_DO_STCLASS_OR;
3036 /* These are the cases when once a subexpression
3037 fails at a particular position, it cannot succeed
3038 even after backtracking at the enclosing scope.
3040 XXXX what if minimal match and we are at the
3041 initial run of {n,m}? */
3042 if ((mincount != maxcount - 1) && (maxcount != REG_INFTY))
3043 f &= ~SCF_WHILEM_VISITED_POS;
3045 /* This will finish on WHILEM, setting scan, or on NULL: */
3046 minnext = study_chunk(pRExC_state, &scan, minlenp, &deltanext,
3047 last, data, stopparen, recursed, NULL,
3049 ? (f & ~SCF_DO_SUBSTR) : f),depth+1);
3051 if (flags & SCF_DO_STCLASS)
3052 data->start_class = oclass;
3053 if (mincount == 0 || minnext == 0) {
3054 if (flags & SCF_DO_STCLASS_OR) {
3055 cl_or(pRExC_state, data->start_class, &this_class);
3057 else if (flags & SCF_DO_STCLASS_AND) {
3058 /* Switch to OR mode: cache the old value of
3059 * data->start_class */
3061 StructCopy(data->start_class, and_withp,
3062 struct regnode_charclass_class);
3063 flags &= ~SCF_DO_STCLASS_AND;
3064 StructCopy(&this_class, data->start_class,
3065 struct regnode_charclass_class);
3066 flags |= SCF_DO_STCLASS_OR;
3067 data->start_class->flags |= ANYOF_EOS;
3069 } else { /* Non-zero len */
3070 if (flags & SCF_DO_STCLASS_OR) {
3071 cl_or(pRExC_state, data->start_class, &this_class);
3072 cl_and(data->start_class, and_withp);
3074 else if (flags & SCF_DO_STCLASS_AND)
3075 cl_and(data->start_class, &this_class);
3076 flags &= ~SCF_DO_STCLASS;
3078 if (!scan) /* It was not CURLYX, but CURLY. */
3080 if ( /* ? quantifier ok, except for (?{ ... }) */
3081 (next_is_eval || !(mincount == 0 && maxcount == 1))
3082 && (minnext == 0) && (deltanext == 0)
3083 && data && !(data->flags & (SF_HAS_PAR|SF_IN_PAR))
3084 && maxcount <= REG_INFTY/3 /* Complement check for big count */
3085 && ckWARN(WARN_REGEXP))
3088 "Quantifier unexpected on zero-length expression");
3091 min += minnext * mincount;
3092 is_inf_internal |= ((maxcount == REG_INFTY
3093 && (minnext + deltanext) > 0)
3094 || deltanext == I32_MAX);
3095 is_inf |= is_inf_internal;
3096 delta += (minnext + deltanext) * maxcount - minnext * mincount;
3098 /* Try powerful optimization CURLYX => CURLYN. */
3099 if ( OP(oscan) == CURLYX && data
3100 && data->flags & SF_IN_PAR
3101 && !(data->flags & SF_HAS_EVAL)
3102 && !deltanext && minnext == 1 ) {
3103 /* Try to optimize to CURLYN. */
3104 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS;
3105 regnode * const nxt1 = nxt;
3112 if (!strchr((const char*)PL_simple,OP(nxt))
3113 && !(PL_regkind[OP(nxt)] == EXACT
3114 && STR_LEN(nxt) == 1))
3120 if (OP(nxt) != CLOSE)
3122 if (RExC_open_parens) {
3123 RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
3124 RExC_close_parens[ARG(nxt1)-1]=nxt+2; /*close->while*/
3126 /* Now we know that nxt2 is the only contents: */
3127 oscan->flags = (U8)ARG(nxt);
3129 OP(nxt1) = NOTHING; /* was OPEN. */
3132 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
3133 NEXT_OFF(nxt1+ 1) = 0; /* just for consistancy. */
3134 NEXT_OFF(nxt2) = 0; /* just for consistancy with CURLY. */
3135 OP(nxt) = OPTIMIZED; /* was CLOSE. */
3136 OP(nxt + 1) = OPTIMIZED; /* was count. */
3137 NEXT_OFF(nxt+ 1) = 0; /* just for consistancy. */
3142 /* Try optimization CURLYX => CURLYM. */
3143 if ( OP(oscan) == CURLYX && data
3144 && !(data->flags & SF_HAS_PAR)
3145 && !(data->flags & SF_HAS_EVAL)
3146 && !deltanext /* atom is fixed width */
3147 && minnext != 0 /* CURLYM can't handle zero width */
3149 /* XXXX How to optimize if data == 0? */
3150 /* Optimize to a simpler form. */
3151 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN */
3155 while ( (nxt2 = regnext(nxt)) /* skip over embedded stuff*/
3156 && (OP(nxt2) != WHILEM))
3158 OP(nxt2) = SUCCEED; /* Whas WHILEM */
3159 /* Need to optimize away parenths. */
3160 if (data->flags & SF_IN_PAR) {
3161 /* Set the parenth number. */
3162 regnode *nxt1 = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN*/
3164 if (OP(nxt) != CLOSE)
3165 FAIL("Panic opt close");
3166 oscan->flags = (U8)ARG(nxt);
3167 if (RExC_open_parens) {
3168 RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
3169 RExC_close_parens[ARG(nxt1)-1]=nxt2+1; /*close->NOTHING*/
3171 OP(nxt1) = OPTIMIZED; /* was OPEN. */
3172 OP(nxt) = OPTIMIZED; /* was CLOSE. */
3175 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
3176 OP(nxt + 1) = OPTIMIZED; /* was count. */
3177 NEXT_OFF(nxt1 + 1) = 0; /* just for consistancy. */
3178 NEXT_OFF(nxt + 1) = 0; /* just for consistancy. */
3181 while ( nxt1 && (OP(nxt1) != WHILEM)) {
3182 regnode *nnxt = regnext(nxt1);
3185 if (reg_off_by_arg[OP(nxt1)])
3186 ARG_SET(nxt1, nxt2 - nxt1);
3187 else if (nxt2 - nxt1 < U16_MAX)
3188 NEXT_OFF(nxt1) = nxt2 - nxt1;
3190 OP(nxt) = NOTHING; /* Cannot beautify */
3195 /* Optimize again: */
3196 study_chunk(pRExC_state, &nxt1, minlenp, &deltanext, nxt,
3197 NULL, stopparen, recursed, NULL, 0,depth+1);
3202 else if ((OP(oscan) == CURLYX)
3203 && (flags & SCF_WHILEM_VISITED_POS)
3204 /* See the comment on a similar expression above.
3205 However, this time it not a subexpression
3206 we care about, but the expression itself. */
3207 && (maxcount == REG_INFTY)
3208 && data && ++data->whilem_c < 16) {
3209 /* This stays as CURLYX, we can put the count/of pair. */
3210 /* Find WHILEM (as in regexec.c) */
3211 regnode *nxt = oscan + NEXT_OFF(oscan);
3213 if (OP(PREVOPER(nxt)) == NOTHING) /* LONGJMP */
3215 PREVOPER(nxt)->flags = (U8)(data->whilem_c
3216 | (RExC_whilem_seen << 4)); /* On WHILEM */
3218 if (data && fl & (SF_HAS_PAR|SF_IN_PAR))
3220 if (flags & SCF_DO_SUBSTR) {
3221 SV *last_str = NULL;
3222 int counted = mincount != 0;
3224 if (data->last_end > 0 && mincount != 0) { /* Ends with a string. */
3225 #if defined(SPARC64_GCC_WORKAROUND)
3228 const char *s = NULL;
3231 if (pos_before >= data->last_start_min)
3234 b = data->last_start_min;
3237 s = SvPV_const(data->last_found, l);
3238 old = b - data->last_start_min;
3241 I32 b = pos_before >= data->last_start_min
3242 ? pos_before : data->last_start_min;
3244 const char * const s = SvPV_const(data->last_found, l);
3245 I32 old = b - data->last_start_min;
3249 old = utf8_hop((U8*)s, old) - (U8*)s;
3252 /* Get the added string: */
3253 last_str = newSVpvn(s + old, l);
3255 SvUTF8_on(last_str);
3256 if (deltanext == 0 && pos_before == b) {
3257 /* What was added is a constant string */
3259 SvGROW(last_str, (mincount * l) + 1);
3260 repeatcpy(SvPVX(last_str) + l,
3261 SvPVX_const(last_str), l, mincount - 1);
3262 SvCUR_set(last_str, SvCUR(last_str) * mincount);
3263 /* Add additional parts. */
3264 SvCUR_set(data->last_found,
3265 SvCUR(data->last_found) - l);
3266 sv_catsv(data->last_found, last_str);
3268 SV * sv = data->last_found;
3270 SvUTF8(sv) && SvMAGICAL(sv) ?
3271 mg_find(sv, PERL_MAGIC_utf8) : NULL;
3272 if (mg && mg->mg_len >= 0)
3273 mg->mg_len += CHR_SVLEN(last_str);
3275 data->last_end += l * (mincount - 1);
3278 /* start offset must point into the last copy */
3279 data->last_start_min += minnext * (mincount - 1);
3280 data->last_start_max += is_inf ? I32_MAX
3281 : (maxcount - 1) * (minnext + data->pos_delta);
3284 /* It is counted once already... */
3285 data->pos_min += minnext * (mincount - counted);
3286 data->pos_delta += - counted * deltanext +
3287 (minnext + deltanext) * maxcount - minnext * mincount;
3288 if (mincount != maxcount) {
3289 /* Cannot extend fixed substrings found inside
3291 SCAN_COMMIT(pRExC_state,data,minlenp);
3292 if (mincount && last_str) {
3293 SV * const sv = data->last_found;
3294 MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
3295 mg_find(sv, PERL_MAGIC_utf8) : NULL;
3299 sv_setsv(sv, last_str);
3300 data->last_end = data->pos_min;
3301 data->last_start_min =
3302 data->pos_min - CHR_SVLEN(last_str);
3303 data->last_start_max = is_inf
3305 : data->pos_min + data->pos_delta
3306 - CHR_SVLEN(last_str);
3308 data->longest = &(data->longest_float);
3310 SvREFCNT_dec(last_str);
3312 if (data && (fl & SF_HAS_EVAL))
3313 data->flags |= SF_HAS_EVAL;
3314 optimize_curly_tail:
3315 if (OP(oscan) != CURLYX) {
3316 while (PL_regkind[OP(next = regnext(oscan))] == NOTHING
3318 NEXT_OFF(oscan) += NEXT_OFF(next);
3321 default: /* REF and CLUMP only? */
3322 if (flags & SCF_DO_SUBSTR) {
3323 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3324 data->longest = &(data->longest_float);
3326 is_inf = is_inf_internal = 1;
3327 if (flags & SCF_DO_STCLASS_OR)
3328 cl_anything(pRExC_state, data->start_class);
3329 flags &= ~SCF_DO_STCLASS;
3333 else if (strchr((const char*)PL_simple,OP(scan))) {
3336 if (flags & SCF_DO_SUBSTR) {
3337 SCAN_COMMIT(pRExC_state,data,minlenp);
3341 if (flags & SCF_DO_STCLASS) {
3342 data->start_class->flags &= ~ANYOF_EOS; /* No match on empty */
3344 /* Some of the logic below assumes that switching
3345 locale on will only add false positives. */
3346 switch (PL_regkind[OP(scan)]) {
3350 /* Perl_croak(aTHX_ "panic: unexpected simple REx opcode %d", OP(scan)); */
3351 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
3352 cl_anything(pRExC_state, data->start_class);
3355 if (OP(scan) == SANY)
3357 if (flags & SCF_DO_STCLASS_OR) { /* Everything but \n */
3358 value = (ANYOF_BITMAP_TEST(data->start_class,'\n')
3359 || (data->start_class->flags & ANYOF_CLASS));
3360 cl_anything(pRExC_state, data->start_class);
3362 if (flags & SCF_DO_STCLASS_AND || !value)
3363 ANYOF_BITMAP_CLEAR(data->start_class,'\n');
3366 if (flags & SCF_DO_STCLASS_AND)
3367 cl_and(data->start_class,
3368 (struct regnode_charclass_class*)scan);
3370 cl_or(pRExC_state, data->start_class,
3371 (struct regnode_charclass_class*)scan);
3374 if (flags & SCF_DO_STCLASS_AND) {
3375 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3376 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NALNUM);
3377 for (value = 0; value < 256; value++)
3378 if (!isALNUM(value))
3379 ANYOF_BITMAP_CLEAR(data->start_class, value);
3383 if (data->start_class->flags & ANYOF_LOCALE)
3384 ANYOF_CLASS_SET(data->start_class,ANYOF_ALNUM);
3386 for (value = 0; value < 256; value++)
3388 ANYOF_BITMAP_SET(data->start_class, value);
3393 if (flags & SCF_DO_STCLASS_AND) {
3394 if (data->start_class->flags & ANYOF_LOCALE)
3395 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NALNUM);
3398 ANYOF_CLASS_SET(data->start_class,ANYOF_ALNUM);
3399 data->start_class->flags |= ANYOF_LOCALE;
3403 if (flags & SCF_DO_STCLASS_AND) {
3404 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3405 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_ALNUM);
3406 for (value = 0; value < 256; value++)
3408 ANYOF_BITMAP_CLEAR(data->start_class, value);
3412 if (data->start_class->flags & ANYOF_LOCALE)
3413 ANYOF_CLASS_SET(data->start_class,ANYOF_NALNUM);
3415 for (value = 0; value < 256; value++)
3416 if (!isALNUM(value))
3417 ANYOF_BITMAP_SET(data->start_class, value);
3422 if (flags & SCF_DO_STCLASS_AND) {
3423 if (data->start_class->flags & ANYOF_LOCALE)
3424 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_ALNUM);
3427 data->start_class->flags |= ANYOF_LOCALE;
3428 ANYOF_CLASS_SET(data->start_class,ANYOF_NALNUM);
3432 if (flags & SCF_DO_STCLASS_AND) {
3433 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3434 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NSPACE);
3435 for (value = 0; value < 256; value++)
3436 if (!isSPACE(value))
3437 ANYOF_BITMAP_CLEAR(data->start_class, value);
3441 if (data->start_class->flags & ANYOF_LOCALE)
3442 ANYOF_CLASS_SET(data->start_class,ANYOF_SPACE);
3444 for (value = 0; value < 256; value++)
3446 ANYOF_BITMAP_SET(data->start_class, value);
3451 if (flags & SCF_DO_STCLASS_AND) {
3452 if (data->start_class->flags & ANYOF_LOCALE)
3453 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NSPACE);
3456 data->start_class->flags |= ANYOF_LOCALE;
3457 ANYOF_CLASS_SET(data->start_class,ANYOF_SPACE);
3461 if (flags & SCF_DO_STCLASS_AND) {
3462 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3463 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_SPACE);
3464 for (value = 0; value < 256; value++)
3466 ANYOF_BITMAP_CLEAR(data->start_class, value);
3470 if (data->start_class->flags & ANYOF_LOCALE)
3471 ANYOF_CLASS_SET(data->start_class,ANYOF_NSPACE);
3473 for (value = 0; value < 256; value++)
3474 if (!isSPACE(value))
3475 ANYOF_BITMAP_SET(data->start_class, value);
3480 if (flags & SCF_DO_STCLASS_AND) {
3481 if (data->start_class->flags & ANYOF_LOCALE) {
3482 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_SPACE);
3483 for (value = 0; value < 256; value++)
3484 if (!isSPACE(value))
3485 ANYOF_BITMAP_CLEAR(data->start_class, value);
3489 data->start_class->flags |= ANYOF_LOCALE;
3490 ANYOF_CLASS_SET(data->start_class,ANYOF_NSPACE);
3494 if (flags & SCF_DO_STCLASS_AND) {
3495 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NDIGIT);
3496 for (value = 0; value < 256; value++)
3497 if (!isDIGIT(value))
3498 ANYOF_BITMAP_CLEAR(data->start_class, value);
3501 if (data->start_class->flags & ANYOF_LOCALE)
3502 ANYOF_CLASS_SET(data->start_class,ANYOF_DIGIT);
3504 for (value = 0; value < 256; value++)
3506 ANYOF_BITMAP_SET(data->start_class, value);
3511 if (flags & SCF_DO_STCLASS_AND) {
3512 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_DIGIT);
3513 for (value = 0; value < 256; value++)
3515 ANYOF_BITMAP_CLEAR(data->start_class, value);
3518 if (data->start_class->flags & ANYOF_LOCALE)
3519 ANYOF_CLASS_SET(data->start_class,ANYOF_NDIGIT);
3521 for (value = 0; value < 256; value++)
3522 if (!isDIGIT(value))
3523 ANYOF_BITMAP_SET(data->start_class, value);
3528 if (flags & SCF_DO_STCLASS_OR)
3529 cl_and(data->start_class, and_withp);
3530 flags &= ~SCF_DO_STCLASS;
3533 else if (PL_regkind[OP(scan)] == EOL && flags & SCF_DO_SUBSTR) {
3534 data->flags |= (OP(scan) == MEOL
3538 else if ( PL_regkind[OP(scan)] == BRANCHJ
3539 /* Lookbehind, or need to calculate parens/evals/stclass: */
3540 && (scan->flags || data || (flags & SCF_DO_STCLASS))
3541 && (OP(scan) == IFMATCH || OP(scan) == UNLESSM)) {
3542 if ( !PERL_ENABLE_POSITIVE_ASSERTION_STUDY
3543 || OP(scan) == UNLESSM )
3545 /* Negative Lookahead/lookbehind
3546 In this case we can't do fixed string optimisation.
3549 I32 deltanext, minnext, fake = 0;
3551 struct regnode_charclass_class intrnl;
3554 data_fake.flags = 0;
3556 data_fake.whilem_c = data->whilem_c;
3557 data_fake.last_closep = data->last_closep;
3560 data_fake.last_closep = &fake;
3561 data_fake.pos_delta = delta;
3562 if ( flags & SCF_DO_STCLASS && !scan->flags
3563 && OP(scan) == IFMATCH ) { /* Lookahead */
3564 cl_init(pRExC_state, &intrnl);
3565 data_fake.start_class = &intrnl;
3566 f |= SCF_DO_STCLASS_AND;
3568 if (flags & SCF_WHILEM_VISITED_POS)
3569 f |= SCF_WHILEM_VISITED_POS;
3570 next = regnext(scan);
3571 nscan = NEXTOPER(NEXTOPER(scan));
3572 minnext = study_chunk(pRExC_state, &nscan, minlenp, &deltanext,
3573 last, &data_fake, stopparen, recursed, NULL, f, depth+1);
3576 FAIL("Variable length lookbehind not implemented");
3578 else if (minnext > (I32)U8_MAX) {
3579 FAIL2("Lookbehind longer than %"UVuf" not implemented", (UV)U8_MAX);
3581 scan->flags = (U8)minnext;
3584 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3586 if (data_fake.flags & SF_HAS_EVAL)
3587 data->flags |= SF_HAS_EVAL;
3588 data->whilem_c = data_fake.whilem_c;
3590 if (f & SCF_DO_STCLASS_AND) {
3591 const int was = (data->start_class->flags & ANYOF_EOS);
3593 cl_and(data->start_class, &intrnl);
3595 data->start_class->flags |= ANYOF_EOS;
3598 #if PERL_ENABLE_POSITIVE_ASSERTION_STUDY
3600 /* Positive Lookahead/lookbehind
3601 In this case we can do fixed string optimisation,
3602 but we must be careful about it. Note in the case of
3603 lookbehind the positions will be offset by the minimum
3604 length of the pattern, something we won't know about
3605 until after the recurse.
3607 I32 deltanext, fake = 0;
3609 struct regnode_charclass_class intrnl;
3611 /* We use SAVEFREEPV so that when the full compile
3612 is finished perl will clean up the allocated
3613 minlens when its all done. This was we don't
3614 have to worry about freeing them when we know
3615 they wont be used, which would be a pain.
3618 Newx( minnextp, 1, I32 );
3619 SAVEFREEPV(minnextp);
3622 StructCopy(data, &data_fake, scan_data_t);
3623 if ((flags & SCF_DO_SUBSTR) && data->last_found) {
3626 SCAN_COMMIT(pRExC_state, &data_fake,minlenp);
3627 data_fake.last_found=newSVsv(data->last_found);
3631 data_fake.last_closep = &fake;
3632 data_fake.flags = 0;
3633 data_fake.pos_delta = delta;
3635 data_fake.flags |= SF_IS_INF;
3636 if ( flags & SCF_DO_STCLASS && !scan->flags
3637 && OP(scan) == IFMATCH ) { /* Lookahead */
3638 cl_init(pRExC_state, &intrnl);
3639 data_fake.start_class = &intrnl;
3640 f |= SCF_DO_STCLASS_AND;
3642 if (flags & SCF_WHILEM_VISITED_POS)
3643 f |= SCF_WHILEM_VISITED_POS;
3644 next = regnext(scan);
3645 nscan = NEXTOPER(NEXTOPER(scan));
3647 *minnextp = study_chunk(pRExC_state, &nscan, minnextp, &deltanext,
3648 last, &data_fake, stopparen, recursed, NULL, f,depth+1);
3651 FAIL("Variable length lookbehind not implemented");
3653 else if (*minnextp > (I32)U8_MAX) {
3654 FAIL2("Lookbehind longer than %"UVuf" not implemented", (UV)U8_MAX);
3656 scan->flags = (U8)*minnextp;
3661 if (f & SCF_DO_STCLASS_AND) {
3662 const int was = (data->start_class->flags & ANYOF_EOS);
3664 cl_and(data->start_class, &intrnl);
3666 data->start_class->flags |= ANYOF_EOS;
3669 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3671 if (data_fake.flags & SF_HAS_EVAL)
3672 data->flags |= SF_HAS_EVAL;
3673 data->whilem_c = data_fake.whilem_c;
3674 if ((flags & SCF_DO_SUBSTR) && data_fake.last_found) {
3675 if (RExC_rx->minlen<*minnextp)
3676 RExC_rx->minlen=*minnextp;
3677 SCAN_COMMIT(pRExC_state, &data_fake, minnextp);
3678 SvREFCNT_dec(data_fake.last_found);
3680 if ( data_fake.minlen_fixed != minlenp )
3682 data->offset_fixed= data_fake.offset_fixed;
3683 data->minlen_fixed= data_fake.minlen_fixed;
3684 data->lookbehind_fixed+= scan->flags;
3686 if ( data_fake.minlen_float != minlenp )
3688 data->minlen_float= data_fake.minlen_float;
3689 data->offset_float_min=data_fake.offset_float_min;
3690 data->offset_float_max=data_fake.offset_float_max;
3691 data->lookbehind_float+= scan->flags;
3700 else if (OP(scan) == OPEN) {
3701 if (stopparen != (I32)ARG(scan))
3704 else if (OP(scan) == CLOSE) {
3705 if (stopparen == (I32)ARG(scan)) {
3708 if ((I32)ARG(scan) == is_par) {
3709 next = regnext(scan);
3711 if ( next && (OP(next) != WHILEM) && next < last)
3712 is_par = 0; /* Disable optimization */
3715 *(data->last_closep) = ARG(scan);
3717 else if (OP(scan) == EVAL) {
3719 data->flags |= SF_HAS_EVAL;
3721 else if ( PL_regkind[OP(scan)] == ENDLIKE ) {
3722 if (flags & SCF_DO_SUBSTR) {
3723 SCAN_COMMIT(pRExC_state,data,minlenp);
3724 flags &= ~SCF_DO_SUBSTR;
3726 if (data && OP(scan)==ACCEPT) {
3727 data->flags |= SCF_SEEN_ACCEPT;
3732 else if (OP(scan) == LOGICAL && scan->flags == 2) /* Embedded follows */
3734 if (flags & SCF_DO_SUBSTR) {
3735 SCAN_COMMIT(pRExC_state,data,minlenp);
3736 data->longest = &(data->longest_float);
3738 is_inf = is_inf_internal = 1;
3739 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
3740 cl_anything(pRExC_state, data->start_class);
3741 flags &= ~SCF_DO_STCLASS;
3743 else if (OP(scan) == GPOS) {
3744 if (!(RExC_rx->extflags & RXf_GPOS_FLOAT) &&
3745 !(delta || is_inf || (data && data->pos_delta)))
3747 if (!(RExC_rx->extflags & RXf_ANCH) && (flags & SCF_DO_SUBSTR))
3748 RExC_rx->extflags |= RXf_ANCH_GPOS;
3749 if (RExC_rx->gofs < (U32)min)
3750 RExC_rx->gofs = min;
3752 RExC_rx->extflags |= RXf_GPOS_FLOAT;
3756 #ifdef TRIE_STUDY_OPT
3757 #ifdef FULL_TRIE_STUDY
3758 else if (PL_regkind[OP(scan)] == TRIE) {
3759 /* NOTE - There is similar code to this block above for handling
3760 BRANCH nodes on the initial study. If you change stuff here
3762 regnode *trie_node= scan;
3763 regnode *tail= regnext(scan);
3764 reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
3765 I32 max1 = 0, min1 = I32_MAX;
3766 struct regnode_charclass_class accum;
3768 if (flags & SCF_DO_SUBSTR) /* XXXX Add !SUSPEND? */
3769 SCAN_COMMIT(pRExC_state, data,minlenp); /* Cannot merge strings after this. */
3770 if (flags & SCF_DO_STCLASS)
3771 cl_init_zero(pRExC_state, &accum);
3777 const regnode *nextbranch= NULL;
3780 for ( word=1 ; word <= trie->wordcount ; word++)
3782 I32 deltanext=0, minnext=0, f = 0, fake;
3783 struct regnode_charclass_class this_class;
3785 data_fake.flags = 0;
3787 data_fake.whilem_c = data->whilem_c;
3788 data_fake.last_closep = data->last_closep;
3791 data_fake.last_closep = &fake;
3792 data_fake.pos_delta = delta;
3793 if (flags & SCF_DO_STCLASS) {
3794 cl_init(pRExC_state, &this_class);
3795 data_fake.start_class = &this_class;
3796 f = SCF_DO_STCLASS_AND;
3798 if (flags & SCF_WHILEM_VISITED_POS)
3799 f |= SCF_WHILEM_VISITED_POS;
3801 if (trie->jump[word]) {
3803 nextbranch = trie_node + trie->jump[0];
3804 scan= trie_node + trie->jump[word];
3805 /* We go from the jump point to the branch that follows
3806 it. Note this means we need the vestigal unused branches
3807 even though they arent otherwise used.
3809 minnext = study_chunk(pRExC_state, &scan, minlenp,
3810 &deltanext, (regnode *)nextbranch, &data_fake,
3811 stopparen, recursed, NULL, f,depth+1);
3813 if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
3814 nextbranch= regnext((regnode*)nextbranch);
3816 if (min1 > (I32)(minnext + trie->minlen))
3817 min1 = minnext + trie->minlen;
3818 if (max1 < (I32)(minnext + deltanext + trie->maxlen))
3819 max1 = minnext + deltanext + trie->maxlen;
3820 if (deltanext == I32_MAX)
3821 is_inf = is_inf_internal = 1;
3823 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3825 if (data_fake.flags & SCF_SEEN_ACCEPT) {
3826 if ( stopmin > min + min1)
3827 stopmin = min + min1;
3828 flags &= ~SCF_DO_SUBSTR;
3830 data->flags |= SCF_SEEN_ACCEPT;
3833 if (data_fake.flags & SF_HAS_EVAL)
3834 data->flags |= SF_HAS_EVAL;
3835 data->whilem_c = data_fake.whilem_c;
3837 if (flags & SCF_DO_STCLASS)
3838 cl_or(pRExC_state, &accum, &this_class);
3841 if (flags & SCF_DO_SUBSTR) {
3842 data->pos_min += min1;
3843 data->pos_delta += max1 - min1;
3844 if (max1 != min1 || is_inf)
3845 data->longest = &(data->longest_float);
3848 delta += max1 - min1;
3849 if (flags & SCF_DO_STCLASS_OR) {
3850 cl_or(pRExC_state, data->start_class, &accum);
3852 cl_and(data->start_class, and_withp);
3853 flags &= ~SCF_DO_STCLASS;
3856 else if (flags & SCF_DO_STCLASS_AND) {
3858 cl_and(data->start_class, &accum);
3859 flags &= ~SCF_DO_STCLASS;
3862 /* Switch to OR mode: cache the old value of
3863 * data->start_class */
3865 StructCopy(data->start_class, and_withp,
3866 struct regnode_charclass_class);
3867 flags &= ~SCF_DO_STCLASS_AND;
3868 StructCopy(&accum, data->start_class,
3869 struct regnode_charclass_class);
3870 flags |= SCF_DO_STCLASS_OR;
3871 data->start_class->flags |= ANYOF_EOS;
3878 else if (PL_regkind[OP(scan)] == TRIE) {
3879 reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
3882 min += trie->minlen;
3883 delta += (trie->maxlen - trie->minlen);
3884 flags &= ~SCF_DO_STCLASS; /* xxx */
3885 if (flags & SCF_DO_SUBSTR) {
3886 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3887 data->pos_min += trie->minlen;
3888 data->pos_delta += (trie->maxlen - trie->minlen);
3889 if (trie->maxlen != trie->minlen)
3890 data->longest = &(data->longest_float);
3892 if (trie->jump) /* no more substrings -- for now /grr*/
3893 flags &= ~SCF_DO_SUBSTR;
3895 #endif /* old or new */
3896 #endif /* TRIE_STUDY_OPT */
3897 /* Else: zero-length, ignore. */
3898 scan = regnext(scan);
3903 stopparen = frame->stop;
3904 frame = frame->prev;
3905 goto fake_study_recurse;
3910 DEBUG_STUDYDATA("pre-fin:",data,depth);
3913 *deltap = is_inf_internal ? I32_MAX : delta;
3914 if (flags & SCF_DO_SUBSTR && is_inf)
3915 data->pos_delta = I32_MAX - data->pos_min;
3916 if (is_par > (I32)U8_MAX)
3918 if (is_par && pars==1 && data) {
3919 data->flags |= SF_IN_PAR;
3920 data->flags &= ~SF_HAS_PAR;
3922 else if (pars && data) {
3923 data->flags |= SF_HAS_PAR;
3924 data->flags &= ~SF_IN_PAR;
3926 if (flags & SCF_DO_STCLASS_OR)
3927 cl_and(data->start_class, and_withp);
3928 if (flags & SCF_TRIE_RESTUDY)
3929 data->flags |= SCF_TRIE_RESTUDY;
3931 DEBUG_STUDYDATA("post-fin:",data,depth);
3933 return min < stopmin ? min : stopmin;
3937 S_add_data(RExC_state_t *pRExC_state, U32 n, const char *s)
3939 U32 count = RExC_rxi->data ? RExC_rxi->data->count : 0;
3941 Renewc(RExC_rxi->data,
3942 sizeof(*RExC_rxi->data) + sizeof(void*) * (count + n - 1),
3943 char, struct reg_data);
3945 Renew(RExC_rxi->data->what, count + n, U8);
3947 Newx(RExC_rxi->data->what, n, U8);
3948 RExC_rxi->data->count = count + n;
3949 Copy(s, RExC_rxi->data->what + count, n, U8);
3953 /*XXX: todo make this not included in a non debugging perl */
3954 #ifndef PERL_IN_XSUB_RE
3956 Perl_reginitcolors(pTHX)
3959 const char * const s = PerlEnv_getenv("PERL_RE_COLORS");
3961 char *t = savepv(s);
3965 t = strchr(t, '\t');
3971 PL_colors[i] = t = (char *)"";
3976 PL_colors[i++] = (char *)"";
3983 #ifdef TRIE_STUDY_OPT
3984 #define CHECK_RESTUDY_GOTO \
3986 (data.flags & SCF_TRIE_RESTUDY) \
3990 #define CHECK_RESTUDY_GOTO
3994 - pregcomp - compile a regular expression into internal code
3996 * We can't allocate space until we know how big the compiled form will be,
3997 * but we can't compile it (and thus know how big it is) until we've got a
3998 * place to put the code. So we cheat: we compile it twice, once with code
3999 * generation turned off and size counting turned on, and once "for real".
4000 * This also means that we don't allocate space until we are sure that the
4001 * thing really will compile successfully, and we never have to move the
4002 * code and thus invalidate pointers into it. (Note that it has to be in
4003 * one piece because free() must be able to free it all.) [NB: not true in perl]
4005 * Beware that the optimization-preparation code in here knows about some
4006 * of the structure of the compiled regexp. [I'll say.]
4011 #ifndef PERL_IN_XSUB_RE
4012 #define RE_ENGINE_PTR &PL_core_reg_engine
4014 extern const struct regexp_engine my_reg_engine;
4015 #define RE_ENGINE_PTR &my_reg_engine
4018 #ifndef PERL_IN_XSUB_RE
4020 Perl_pregcomp(pTHX_ char *exp, char *xend, U32 pm_flags)
4023 HV * const table = GvHV(PL_hintgv);
4024 /* Dispatch a request to compile a regexp to correct
4027 SV **ptr= hv_fetchs(table, "regcomp", FALSE);
4028 GET_RE_DEBUG_FLAGS_DECL;
4029 if (ptr && SvIOK(*ptr) && SvIV(*ptr)) {
4030 const regexp_engine *eng=INT2PTR(regexp_engine*,SvIV(*ptr));
4032 PerlIO_printf(Perl_debug_log, "Using engine %"UVxf"\n",
4035 return CALLREGCOMP_ENG(eng, exp, xend, pm_flags);
4038 return Perl_re_compile(aTHX_ exp, xend, pm_flags);
4043 Perl_re_compile(pTHX_ char *exp, char *xend, U32 pm_flags)
4047 register regexp_internal *ri;
4055 RExC_state_t RExC_state;
4056 RExC_state_t * const pRExC_state = &RExC_state;
4057 #ifdef TRIE_STUDY_OPT
4059 RExC_state_t copyRExC_state;
4061 GET_RE_DEBUG_FLAGS_DECL;
4062 DEBUG_r(if (!PL_colorset) reginitcolors());
4065 FAIL("NULL regexp argument");
4067 RExC_utf8 = RExC_orig_utf8 = pm_flags & RXf_UTF8;
4070 SV *dsv= sv_newmortal();
4071 RE_PV_QUOTED_DECL(s, RExC_utf8,
4072 dsv, exp, (xend - exp), 60);
4073 PerlIO_printf(Perl_debug_log, "%sCompiling REx%s %s\n",
4074 PL_colors[4],PL_colors[5],s);
4079 RExC_flags = pm_flags;
4083 RExC_seen_zerolen = *exp == '^' ? -1 : 0;
4084 RExC_seen_evals = 0;
4087 /* First pass: determine size, legality. */
4095 RExC_emit = &PL_regdummy;
4096 RExC_whilem_seen = 0;
4097 RExC_charnames = NULL;
4098 RExC_open_parens = NULL;
4099 RExC_close_parens = NULL;
4101 RExC_paren_names = NULL;
4103 RExC_paren_name_list = NULL;
4105 RExC_recurse = NULL;
4106 RExC_recurse_count = 0;
4108 #if 0 /* REGC() is (currently) a NOP at the first pass.
4109 * Clever compilers notice this and complain. --jhi */
4110 REGC((U8)REG_MAGIC, (char*)RExC_emit);
4112 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log, "Starting first pass (sizing)\n"));
4113 if (reg(pRExC_state, 0, &flags,1) == NULL) {
4114 RExC_precomp = NULL;
4117 if (RExC_utf8 && !RExC_orig_utf8) {
4118 /* It's possible to write a regexp in ascii that represents unicode
4119 codepoints outside of the byte range, such as via \x{100}. If we
4120 detect such a sequence we have to convert the entire pattern to utf8
4121 and then recompile, as our sizing calculation will have been based
4122 on 1 byte == 1 character, but we will need to use utf8 to encode
4123 at least some part of the pattern, and therefore must convert the whole
4125 XXX: somehow figure out how to make this less expensive...
4127 STRLEN len = xend-exp;
4128 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log,
4129 "UTF8 mismatch! Converting to utf8 for resizing and compile\n"));
4130 exp = (char*)Perl_bytes_to_utf8(aTHX_ (U8*)exp, &len);
4132 RExC_orig_utf8 = RExC_utf8;
4134 goto redo_first_pass;
4137 PerlIO_printf(Perl_debug_log,
4138 "Required size %"IVdf" nodes\n"
4139 "Starting second pass (creation)\n",
4142 RExC_lastparse=NULL;
4144 /* Small enough for pointer-storage convention?
4145 If extralen==0, this means that we will not need long jumps. */
4146 if (RExC_size >= 0x10000L && RExC_extralen)
4147 RExC_size += RExC_extralen;
4150 if (RExC_whilem_seen > 15)
4151 RExC_whilem_seen = 15;
4153 /* Allocate space and zero-initialize. Note, the two step process
4154 of zeroing when in debug mode, thus anything assigned has to
4155 happen after that */
4156 Newxz(r, 1, regexp);
4157 Newxc(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode),
4158 char, regexp_internal);
4159 if ( r == NULL || ri == NULL )
4160 FAIL("Regexp out of space");
4162 /* avoid reading uninitialized memory in DEBUGGING code in study_chunk() */
4163 Zero(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode), char);
4165 /* bulk initialize base fields with 0. */
4166 Zero(ri, sizeof(regexp_internal), char);
4169 /* non-zero initialization begins here */
4171 r->engine= RE_ENGINE_PTR;
4173 r->prelen = xend - exp;
4174 r->extflags = pm_flags;
4176 bool has_k = ((r->extflags & RXf_PMf_KEEPCOPY) == RXf_PMf_KEEPCOPY);
4177 bool has_minus = ((r->extflags & RXf_PMf_STD_PMMOD) != RXf_PMf_STD_PMMOD);
4178 bool has_runon = ((RExC_seen & REG_SEEN_RUN_ON_COMMENT)==REG_SEEN_RUN_ON_COMMENT);
4179 U16 reganch = (U16)((r->extflags & RXf_PMf_STD_PMMOD) >> 12);
4180 const char *fptr = STD_PAT_MODS; /*"msix"*/
4182 r->wraplen = r->prelen + has_minus + has_k + has_runon
4183 + (sizeof(STD_PAT_MODS) - 1)
4184 + (sizeof("(?:)") - 1);
4186 Newx(r->wrapped, r->wraplen + 1, char );
4190 *p++ = KEEPCOPY_PAT_MOD; /*'k'*/
4192 char *r = p + (sizeof(STD_PAT_MODS) - 1) + has_minus - 1;
4193 char *colon = r + 1;
4196 while((ch = *fptr++)) {
4210 Copy(RExC_precomp, p, r->prelen, char);
4220 r->nparens = RExC_npar - 1; /* set early to validate backrefs */
4222 if (RExC_seen & REG_SEEN_RECURSE) {
4223 Newxz(RExC_open_parens, RExC_npar,regnode *);
4224 SAVEFREEPV(RExC_open_parens);
4225 Newxz(RExC_close_parens,RExC_npar,regnode *);
4226 SAVEFREEPV(RExC_close_parens);
4229 /* Useful during FAIL. */
4230 #ifdef RE_TRACK_PATTERN_OFFSETS
4231 Newxz(ri->u.offsets, 2*RExC_size+1, U32); /* MJD 20001228 */
4232 DEBUG_OFFSETS_r(PerlIO_printf(Perl_debug_log,
4233 "%s %"UVuf" bytes for offset annotations.\n",
4234 ri->u.offsets ? "Got" : "Couldn't get",
4235 (UV)((2*RExC_size+1) * sizeof(U32))));
4237 SetProgLen(ri,RExC_size);
4241 /* Second pass: emit code. */
4242 RExC_flags = pm_flags; /* don't let top level (?i) bleed */
4247 RExC_emit_start = ri->program;
4248 RExC_emit = ri->program;
4249 RExC_emit_bound = ri->program + RExC_size + 1;
4251 /* Store the count of eval-groups for security checks: */
4252 RExC_rx->seen_evals = RExC_seen_evals;
4253 REGC((U8)REG_MAGIC, (char*) RExC_emit++);
4254 if (reg(pRExC_state, 0, &flags,1) == NULL)
4257 /* XXXX To minimize changes to RE engine we always allocate
4258 3-units-long substrs field. */
4259 Newx(r->substrs, 1, struct reg_substr_data);
4260 if (RExC_recurse_count) {
4261 Newxz(RExC_recurse,RExC_recurse_count,regnode *);
4262 SAVEFREEPV(RExC_recurse);
4266 r->minlen = minlen = sawplus = sawopen = 0;
4267 Zero(r->substrs, 1, struct reg_substr_data);
4269 #ifdef TRIE_STUDY_OPT
4272 DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log,"Restudying\n"));
4274 RExC_state = copyRExC_state;
4275 if (seen & REG_TOP_LEVEL_BRANCHES)
4276 RExC_seen |= REG_TOP_LEVEL_BRANCHES;
4278 RExC_seen &= ~REG_TOP_LEVEL_BRANCHES;
4279 if (data.last_found) {
4280 SvREFCNT_dec(data.longest_fixed);
4281 SvREFCNT_dec(data.longest_float);
4282 SvREFCNT_dec(data.last_found);
4284 StructCopy(&zero_scan_data, &data, scan_data_t);
4286 StructCopy(&zero_scan_data, &data, scan_data_t);
4287 copyRExC_state = RExC_state;
4290 StructCopy(&zero_scan_data, &data, scan_data_t);
4293 /* Dig out information for optimizations. */
4294 r->extflags = pm_flags; /* Again? */
4295 /*dmq: removed as part of de-PMOP: pm->op_pmflags = RExC_flags; */
4298 r->extflags |= RXf_UTF8; /* Unicode in it? */
4299 ri->regstclass = NULL;
4300 if (RExC_naughty >= 10) /* Probably an expensive pattern. */
4301 r->intflags |= PREGf_NAUGHTY;
4302 scan = ri->program + 1; /* First BRANCH. */
4304 /* testing for BRANCH here tells us whether there is "must appear"
4305 data in the pattern. If there is then we can use it for optimisations */
4306 if (!(RExC_seen & REG_TOP_LEVEL_BRANCHES)) { /* Only one top-level choice. */
4308 STRLEN longest_float_length, longest_fixed_length;
4309 struct regnode_charclass_class ch_class; /* pointed to by data */
4311 I32 last_close = 0; /* pointed to by data */
4314 /* Skip introductions and multiplicators >= 1. */
4315 while ((OP(first) == OPEN && (sawopen = 1)) ||
4316 /* An OR of *one* alternative - should not happen now. */
4317 (OP(first) == BRANCH && OP(regnext(first)) != BRANCH) ||
4318 /* for now we can't handle lookbehind IFMATCH*/
4319 (OP(first) == IFMATCH && !first->flags) ||
4320 (OP(first) == PLUS) ||
4321 (OP(first) == MINMOD) ||
4322 /* An {n,m} with n>0 */
4323 (PL_regkind[OP(first)] == CURLY && ARG1(first) > 0) )
4326 if (OP(first) == PLUS)
4329 first += regarglen[OP(first)];
4330 if (OP(first) == IFMATCH) {
4331 first = NEXTOPER(first);
4332 first += EXTRA_STEP_2ARGS;
4333 } else /* XXX possible optimisation for /(?=)/ */
4334 first = NEXTOPER(first);
4337 /* Starting-point info. */
4339 DEBUG_PEEP("first:",first,0);
4340 /* Ignore EXACT as we deal with it later. */
4341 if (PL_regkind[OP(first)] == EXACT) {
4342 if (OP(first) == EXACT)
4343 NOOP; /* Empty, get anchored substr later. */
4344 else if ((OP(first) == EXACTF || OP(first) == EXACTFL))
4345 ri->regstclass = first;
4348 else if (PL_regkind[OP(first)] == TRIE &&
4349 ((reg_trie_data *)ri->data->data[ ARG(first) ])->minlen>0)
4352 /* this can happen only on restudy */
4353 if ( OP(first) == TRIE ) {
4354 struct regnode_1 *trieop = (struct regnode_1 *)
4355 PerlMemShared_calloc(1, sizeof(struct regnode_1));
4356 StructCopy(first,trieop,struct regnode_1);
4357 trie_op=(regnode *)trieop;
4359 struct regnode_charclass *trieop = (struct regnode_charclass *)
4360 PerlMemShared_calloc(1, sizeof(struct regnode_charclass));
4361 StructCopy(first,trieop,struct regnode_charclass);
4362 trie_op=(regnode *)trieop;
4365 make_trie_failtable(pRExC_state, (regnode *)first, trie_op, 0);
4366 ri->regstclass = trie_op;
4369 else if (strchr((const char*)PL_simple,OP(first)))
4370 ri->regstclass = first;
4371 else if (PL_regkind[OP(first)] == BOUND ||
4372 PL_regkind[OP(first)] == NBOUND)
4373 ri->regstclass = first;
4374 else if (PL_regkind[OP(first)] == BOL) {
4375 r->extflags |= (OP(first) == MBOL
4377 : (OP(first) == SBOL
4380 first = NEXTOPER(first);
4383 else if (OP(first) == GPOS) {
4384 r->extflags |= RXf_ANCH_GPOS;
4385 first = NEXTOPER(first);
4388 else if ((!sawopen || !RExC_sawback) &&
4389 (OP(first) == STAR &&
4390 PL_regkind[OP(NEXTOPER(first))] == REG_ANY) &&
4391 !(r->extflags & RXf_ANCH) && !(RExC_seen & REG_SEEN_EVAL))
4393 /* turn .* into ^.* with an implied $*=1 */
4395 (OP(NEXTOPER(first)) == REG_ANY)
4398 r->extflags |= type;
4399 r->intflags |= PREGf_IMPLICIT;
4400 first = NEXTOPER(first);
4403 if (sawplus && (!sawopen || !RExC_sawback)
4404 && !(RExC_seen & REG_SEEN_EVAL)) /* May examine pos and $& */
4405 /* x+ must match at the 1st pos of run of x's */
4406 r->intflags |= PREGf_SKIP;
4408 /* Scan is after the zeroth branch, first is atomic matcher. */
4409 #ifdef TRIE_STUDY_OPT
4412 PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
4413 (IV)(first - scan + 1))
4417 PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
4418 (IV)(first - scan + 1))
4424 * If there's something expensive in the r.e., find the
4425 * longest literal string that must appear and make it the
4426 * regmust. Resolve ties in favor of later strings, since
4427 * the regstart check works with the beginning of the r.e.
4428 * and avoiding duplication strengthens checking. Not a
4429 * strong reason, but sufficient in the absence of others.
4430 * [Now we resolve ties in favor of the earlier string if
4431 * it happens that c_offset_min has been invalidated, since the
4432 * earlier string may buy us something the later one won't.]
4435 data.longest_fixed = newSVpvs("");
4436 data.longest_float = newSVpvs("");
4437 data.last_found = newSVpvs("");
4438 data.longest = &(data.longest_fixed);
4440 if (!ri->regstclass) {
4441 cl_init(pRExC_state, &ch_class);
4442 data.start_class = &ch_class;
4443 stclass_flag = SCF_DO_STCLASS_AND;
4444 } else /* XXXX Check for BOUND? */
4446 data.last_closep = &last_close;
4448 minlen = study_chunk(pRExC_state, &first, &minlen, &fake, scan + RExC_size, /* Up to end */
4449 &data, -1, NULL, NULL,
4450 SCF_DO_SUBSTR | SCF_WHILEM_VISITED_POS | stclass_flag,0);
4456 if ( RExC_npar == 1 && data.longest == &(data.longest_fixed)
4457 && data.last_start_min == 0 && data.last_end > 0
4458 && !RExC_seen_zerolen
4459 && !(RExC_seen & REG_SEEN_VERBARG)
4460 && (!(RExC_seen & REG_SEEN_GPOS) || (r->extflags & RXf_ANCH_GPOS)))
4461 r->extflags |= RXf_CHECK_ALL;
4462 scan_commit(pRExC_state, &data,&minlen,0);
4463 SvREFCNT_dec(data.last_found);
4465 /* Note that code very similar to this but for anchored string
4466 follows immediately below, changes may need to be made to both.
4469 longest_float_length = CHR_SVLEN(data.longest_float);
4470 if (longest_float_length
4471 || (data.flags & SF_FL_BEFORE_EOL
4472 && (!(data.flags & SF_FL_BEFORE_MEOL)
4473 || (RExC_flags & RXf_PMf_MULTILINE))))
4477 if (SvCUR(data.longest_fixed) /* ok to leave SvCUR */
4478 && data.offset_fixed == data.offset_float_min
4479 && SvCUR(data.longest_fixed) == SvCUR(data.longest_float))
4480 goto remove_float; /* As in (a)+. */
4482 /* copy the information about the longest float from the reg_scan_data
4483 over to the program. */
4484 if (SvUTF8(data.longest_float)) {
4485 r->float_utf8 = data.longest_float;
4486 r->float_substr = NULL;
4488 r->float_substr = data.longest_float;
4489 r->float_utf8 = NULL;
4491 /* float_end_shift is how many chars that must be matched that
4492 follow this item. We calculate it ahead of time as once the
4493 lookbehind offset is added in we lose the ability to correctly
4495 ml = data.minlen_float ? *(data.minlen_float)
4496 : (I32)longest_float_length;
4497 r->float_end_shift = ml - data.offset_float_min
4498 - longest_float_length + (SvTAIL(data.longest_float) != 0)
4499 + data.lookbehind_float;
4500 r->float_min_offset = data.offset_float_min - data.lookbehind_float;
4501 r->float_max_offset = data.offset_float_max;
4502 if (data.offset_float_max < I32_MAX) /* Don't offset infinity */
4503 r->float_max_offset -= data.lookbehind_float;
4505 t = (data.flags & SF_FL_BEFORE_EOL /* Can't have SEOL and MULTI */
4506 && (!(data.flags & SF_FL_BEFORE_MEOL)
4507 || (RExC_flags & RXf_PMf_MULTILINE)));
4508 fbm_compile(data.longest_float, t ? FBMcf_TAIL : 0);
4512 r->float_substr = r->float_utf8 = NULL;
4513 SvREFCNT_dec(data.longest_float);
4514 longest_float_length = 0;
4517 /* Note that code very similar to this but for floating string
4518 is immediately above, changes may need to be made to both.
4521 longest_fixed_length = CHR_SVLEN(data.longest_fixed);
4522 if (longest_fixed_length
4523 || (data.flags & SF_FIX_BEFORE_EOL /* Cannot have SEOL and MULTI */
4524 && (!(data.flags & SF_FIX_BEFORE_MEOL)
4525 || (RExC_flags & RXf_PMf_MULTILINE))))
4529 /* copy the information about the longest fixed
4530 from the reg_scan_data over to the program. */
4531 if (SvUTF8(data.longest_fixed)) {
4532 r->anchored_utf8 = data.longest_fixed;
4533 r->anchored_substr = NULL;
4535 r->anchored_substr = data.longest_fixed;
4536 r->anchored_utf8 = NULL;
4538 /* fixed_end_shift is how many chars that must be matched that
4539 follow this item. We calculate it ahead of time as once the
4540 lookbehind offset is added in we lose the ability to correctly
4542 ml = data.minlen_fixed ? *(data.minlen_fixed)
4543 : (I32)longest_fixed_length;
4544 r->anchored_end_shift = ml - data.offset_fixed
4545 - longest_fixed_length + (SvTAIL(data.longest_fixed) != 0)
4546 + data.lookbehind_fixed;
4547 r->anchored_offset = data.offset_fixed - data.lookbehind_fixed;
4549 t = (data.flags & SF_FIX_BEFORE_EOL /* Can't have SEOL and MULTI */
4550 && (!(data.flags & SF_FIX_BEFORE_MEOL)
4551 || (RExC_flags & RXf_PMf_MULTILINE)));
4552 fbm_compile(data.longest_fixed, t ? FBMcf_TAIL : 0);
4555 r->anchored_substr = r->anchored_utf8 = NULL;
4556 SvREFCNT_dec(data.longest_fixed);
4557 longest_fixed_length = 0;
4560 && (OP(ri->regstclass) == REG_ANY || OP(ri->regstclass) == SANY))
4561 ri->regstclass = NULL;
4562 if ((!(r->anchored_substr || r->anchored_utf8) || r->anchored_offset)
4564 && !(data.start_class->flags & ANYOF_EOS)
4565 && !cl_is_anything(data.start_class))
4567 const U32 n = add_data(pRExC_state, 1, "f");
4569 Newx(RExC_rxi->data->data[n], 1,
4570 struct regnode_charclass_class);
4571 StructCopy(data.start_class,
4572 (struct regnode_charclass_class*)RExC_rxi->data->data[n],
4573 struct regnode_charclass_class);
4574 ri->regstclass = (regnode*)RExC_rxi->data->data[n];
4575 r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
4576 DEBUG_COMPILE_r({ SV *sv = sv_newmortal();
4577 regprop(r, sv, (regnode*)data.start_class);
4578 PerlIO_printf(Perl_debug_log,
4579 "synthetic stclass \"%s\".\n",
4580 SvPVX_const(sv));});
4583 /* A temporary algorithm prefers floated substr to fixed one to dig more info. */
4584 if (longest_fixed_length > longest_float_length) {
4585 r->check_end_shift = r->anchored_end_shift;
4586 r->check_substr = r->anchored_substr;
4587 r->check_utf8 = r->anchored_utf8;
4588 r->check_offset_min = r->check_offset_max = r->anchored_offset;
4589 if (r->extflags & RXf_ANCH_SINGLE)
4590 r->extflags |= RXf_NOSCAN;
4593 r->check_end_shift = r->float_end_shift;
4594 r->check_substr = r->float_substr;
4595 r->check_utf8 = r->float_utf8;
4596 r->check_offset_min = r->float_min_offset;
4597 r->check_offset_max = r->float_max_offset;
4599 /* XXXX Currently intuiting is not compatible with ANCH_GPOS.
4600 This should be changed ASAP! */
4601 if ((r->check_substr || r->check_utf8) && !(r->extflags & RXf_ANCH_GPOS)) {
4602 r->extflags |= RXf_USE_INTUIT;
4603 if (SvTAIL(r->check_substr ? r->check_substr : r->check_utf8))
4604 r->extflags |= RXf_INTUIT_TAIL;
4606 /* XXX Unneeded? dmq (shouldn't as this is handled elsewhere)
4607 if ( (STRLEN)minlen < longest_float_length )
4608 minlen= longest_float_length;
4609 if ( (STRLEN)minlen < longest_fixed_length )
4610 minlen= longest_fixed_length;
4614 /* Several toplevels. Best we can is to set minlen. */
4616 struct regnode_charclass_class ch_class;
4619 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log, "\nMulti Top Level\n"));
4621 scan = ri->program + 1;
4622 cl_init(pRExC_state, &ch_class);
4623 data.start_class = &ch_class;
4624 data.last_closep = &last_close;
4627 minlen = study_chunk(pRExC_state, &scan, &minlen, &fake, scan + RExC_size,
4628 &data, -1, NULL, NULL, SCF_DO_STCLASS_AND|SCF_WHILEM_VISITED_POS,0);
4632 r->check_substr = r->check_utf8 = r->anchored_substr = r->anchored_utf8
4633 = r->float_substr = r->float_utf8 = NULL;
4634 if (!(data.start_class->flags & ANYOF_EOS)
4635 && !cl_is_anything(data.start_class))
4637 const U32 n = add_data(pRExC_state, 1, "f");
4639 Newx(RExC_rxi->data->data[n], 1,
4640 struct regnode_charclass_class);
4641 StructCopy(data.start_class,
4642 (struct regnode_charclass_class*)RExC_rxi->data->data[n],
4643 struct regnode_charclass_class);
4644 ri->regstclass = (regnode*)RExC_rxi->data->data[n];
4645 r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
4646 DEBUG_COMPILE_r({ SV* sv = sv_newmortal();
4647 regprop(r, sv, (regnode*)data.start_class);
4648 PerlIO_printf(Perl_debug_log,
4649 "synthetic stclass \"%s\".\n",
4650 SvPVX_const(sv));});
4654 /* Guard against an embedded (?=) or (?<=) with a longer minlen than
4655 the "real" pattern. */
4657 PerlIO_printf(Perl_debug_log,"minlen: %"IVdf" r->minlen:%"IVdf"\n",
4658 (IV)minlen, (IV)r->minlen);
4660 r->minlenret = minlen;
4661 if (r->minlen < minlen)
4664 if (RExC_seen & REG_SEEN_GPOS)
4665 r->extflags |= RXf_GPOS_SEEN;
4666 if (RExC_seen & REG_SEEN_LOOKBEHIND)
4667 r->extflags |= RXf_LOOKBEHIND_SEEN;
4668 if (RExC_seen & REG_SEEN_EVAL)
4669 r->extflags |= RXf_EVAL_SEEN;
4670 if (RExC_seen & REG_SEEN_CANY)
4671 r->extflags |= RXf_CANY_SEEN;
4672 if (RExC_seen & REG_SEEN_VERBARG)
4673 r->intflags |= PREGf_VERBARG_SEEN;
4674 if (RExC_seen & REG_SEEN_CUTGROUP)
4675 r->intflags |= PREGf_CUTGROUP_SEEN;
4676 if (RExC_paren_names)
4677 r->paren_names = (HV*)SvREFCNT_inc(RExC_paren_names);
4679 r->paren_names = NULL;
4680 if (r->prelen == 3 && strnEQ("\\s+", r->precomp, 3)) /* precomp = "\\s+)" */
4681 r->extflags |= RXf_WHITE;
4682 else if (r->prelen == 1 && r->precomp[0] == '^')
4683 r->extflags |= RXf_START_ONLY;
4686 if (RExC_paren_names) {
4687 ri->name_list_idx = add_data( pRExC_state, 1, "p" );
4688 ri->data->data[ri->name_list_idx] = (void*)SvREFCNT_inc(RExC_paren_name_list);
4691 ri->name_list_idx = 0;
4693 if (RExC_recurse_count) {
4694 for ( ; RExC_recurse_count ; RExC_recurse_count-- ) {
4695 const regnode *scan = RExC_recurse[RExC_recurse_count-1];
4696 ARG2L_SET( scan, RExC_open_parens[ARG(scan)-1] - scan );
4699 Newxz(r->offs, RExC_npar, regexp_paren_pair);
4700 /* assume we don't need to swap parens around before we match */
4703 PerlIO_printf(Perl_debug_log,"Final program:\n");
4706 #ifdef RE_TRACK_PATTERN_OFFSETS
4707 DEBUG_OFFSETS_r(if (ri->u.offsets) {
4708 const U32 len = ri->u.offsets[0];
4710 GET_RE_DEBUG_FLAGS_DECL;
4711 PerlIO_printf(Perl_debug_log, "Offsets: [%"UVuf"]\n\t", (UV)ri->u.offsets[0]);
4712 for (i = 1; i <= len; i++) {
4713 if (ri->u.offsets[i*2-1] || ri->u.offsets[i*2])
4714 PerlIO_printf(Perl_debug_log, "%"UVuf":%"UVuf"[%"UVuf"] ",
4715 (UV)i, (UV)ri->u.offsets[i*2-1], (UV)ri->u.offsets[i*2]);
4717 PerlIO_printf(Perl_debug_log, "\n");
4723 #undef RE_ENGINE_PTR
4727 Perl_reg_named_buff_get(pTHX_ const REGEXP * const rx, SV* namesv, U32 flags)
4729 AV *retarray = NULL;
4734 if (rx && rx->paren_names) {
4735 HE *he_str = hv_fetch_ent( rx->paren_names, namesv, 0, 0 );
4738 SV* sv_dat=HeVAL(he_str);
4739 I32 *nums=(I32*)SvPVX(sv_dat);
4740 for ( i=0; i<SvIVX(sv_dat); i++ ) {
4741 if ((I32)(rx->nparens) >= nums[i]
4742 && rx->offs[nums[i]].start != -1
4743 && rx->offs[nums[i]].end != -1)
4745 ret = CALLREG_NUMBUF(rx,nums[i],NULL);
4749 ret = newSVsv(&PL_sv_undef);
4753 av_push(retarray, ret);
4757 return (SV*)retarray;
4764 Perl_reg_numbered_buff_get(pTHX_ const REGEXP * const rx, I32 paren, SV* usesv)
4769 SV *sv = usesv ? usesv : newSVpvs("");
4772 sv_setsv(sv,&PL_sv_undef);
4776 if (paren == -2 && rx->offs[0].start != -1) {
4778 i = rx->offs[0].start;
4782 if (paren == -1 && rx->offs[0].end != -1) {
4784 s = rx->subbeg + rx->offs[0].end;
4785 i = rx->sublen - rx->offs[0].end;
4788 if ( 0 <= paren && paren <= (I32)rx->nparens &&
4789 (s1 = rx->offs[paren].start) != -1 &&
4790 (t1 = rx->offs[paren].end) != -1)
4794 s = rx->subbeg + s1;
4796 sv_setsv(sv,&PL_sv_undef);
4799 assert(rx->sublen >= (s - rx->subbeg) + i );
4801 const int oldtainted = PL_tainted;
4803 sv_setpvn(sv, s, i);
4804 PL_tainted = oldtainted;
4805 if ( (rx->extflags & RXf_CANY_SEEN)
4806 ? (RX_MATCH_UTF8(rx)
4807 && (!i || is_utf8_string((U8*)s, i)))
4808 : (RX_MATCH_UTF8(rx)) )
4815 if (RX_MATCH_TAINTED(rx)) {
4816 if (SvTYPE(sv) >= SVt_PVMG) {
4817 MAGIC* const mg = SvMAGIC(sv);
4820 SvMAGIC_set(sv, mg->mg_moremagic);
4822 if ((mgt = SvMAGIC(sv))) {
4823 mg->mg_moremagic = mgt;
4824 SvMAGIC_set(sv, mg);
4834 sv_setsv(sv,&PL_sv_undef);
4840 Perl_reg_qr_pkg(pTHX_ const REGEXP * const rx)
4842 PERL_UNUSED_ARG(rx);
4843 return newSVpvs("Regexp");
4846 /* Scans the name of a named buffer from the pattern.
4847 * If flags is REG_RSN_RETURN_NULL returns null.
4848 * If flags is REG_RSN_RETURN_NAME returns an SV* containing the name
4849 * If flags is REG_RSN_RETURN_DATA returns the data SV* corresponding
4850 * to the parsed name as looked up in the RExC_paren_names hash.
4851 * If there is an error throws a vFAIL().. type exception.
4854 #define REG_RSN_RETURN_NULL 0
4855 #define REG_RSN_RETURN_NAME 1
4856 #define REG_RSN_RETURN_DATA 2
4859 S_reg_scan_name(pTHX_ RExC_state_t *pRExC_state, U32 flags) {
4860 char *name_start = RExC_parse;
4862 if (isIDFIRST_lazy_if(RExC_parse, UTF)) {
4863 /* skip IDFIRST by using do...while */
4866 RExC_parse += UTF8SKIP(RExC_parse);
4867 } while (isALNUM_utf8((U8*)RExC_parse));
4871 } while (isALNUM(*RExC_parse));
4875 SV* sv_name = sv_2mortal(Perl_newSVpvn(aTHX_ name_start,
4876 (int)(RExC_parse - name_start)));
4879 if ( flags == REG_RSN_RETURN_NAME)
4881 else if (flags==REG_RSN_RETURN_DATA) {
4884 if ( ! sv_name ) /* should not happen*/
4885 Perl_croak(aTHX_ "panic: no svname in reg_scan_name");
4886 if (RExC_paren_names)
4887 he_str = hv_fetch_ent( RExC_paren_names, sv_name, 0, 0 );
4889 sv_dat = HeVAL(he_str);
4891 vFAIL("Reference to nonexistent named group");
4895 Perl_croak(aTHX_ "panic: bad flag in reg_scan_name");
4902 #define DEBUG_PARSE_MSG(funcname) DEBUG_PARSE_r({ \
4903 int rem=(int)(RExC_end - RExC_parse); \
4912 if (RExC_lastparse!=RExC_parse) \
4913 PerlIO_printf(Perl_debug_log," >%.*s%-*s", \
4916 iscut ? "..." : "<" \
4919 PerlIO_printf(Perl_debug_log,"%16s",""); \
4922 num = RExC_size + 1; \
4924 num=REG_NODE_NUM(RExC_emit); \
4925 if (RExC_lastnum!=num) \
4926 PerlIO_printf(Perl_debug_log,"|%4d",num); \
4928 PerlIO_printf(Perl_debug_log,"|%4s",""); \
4929 PerlIO_printf(Perl_debug_log,"|%*s%-4s", \
4930 (int)((depth*2)), "", \
4934 RExC_lastparse=RExC_parse; \
4939 #define DEBUG_PARSE(funcname) DEBUG_PARSE_r({ \
4940 DEBUG_PARSE_MSG((funcname)); \
4941 PerlIO_printf(Perl_debug_log,"%4s","\n"); \
4943 #define DEBUG_PARSE_FMT(funcname,fmt,args) DEBUG_PARSE_r({ \
4944 DEBUG_PARSE_MSG((funcname)); \
4945 PerlIO_printf(Perl_debug_log,fmt "\n",args); \
4948 - reg - regular expression, i.e. main body or parenthesized thing
4950 * Caller must absorb opening parenthesis.
4952 * Combining parenthesis handling with the base level of regular expression
4953 * is a trifle forced, but the need to tie the tails of the branches to what
4954 * follows makes it hard to avoid.
4956 #define REGTAIL(x,y,z) regtail((x),(y),(z),depth+1)
4958 #define REGTAIL_STUDY(x,y,z) regtail_study((x),(y),(z),depth+1)
4960 #define REGTAIL_STUDY(x,y,z) regtail((x),(y),(z),depth+1)
4964 S_reg(pTHX_ RExC_state_t *pRExC_state, I32 paren, I32 *flagp,U32 depth)
4965 /* paren: Parenthesized? 0=top, 1=(, inside: changed to letter. */
4968 register regnode *ret; /* Will be the head of the group. */
4969 register regnode *br;
4970 register regnode *lastbr;
4971 register regnode *ender = NULL;
4972 register I32 parno = 0;
4974 const I32 oregflags = RExC_flags;
4975 bool have_branch = 0;
4977 I32 freeze_paren = 0;
4978 I32 after_freeze = 0;
4980 /* for (?g), (?gc), and (?o) warnings; warning
4981 about (?c) will warn about (?g) -- japhy */
4983 #define WASTED_O 0x01
4984 #define WASTED_G 0x02
4985 #define WASTED_C 0x04
4986 #define WASTED_GC (0x02|0x04)
4987 I32 wastedflags = 0x00;
4989 char * parse_start = RExC_parse; /* MJD */
4990 char * const oregcomp_parse = RExC_parse;
4992 GET_RE_DEBUG_FLAGS_DECL;
4993 DEBUG_PARSE("reg ");
4995 *flagp = 0; /* Tentatively. */
4998 /* Make an OPEN node, if parenthesized. */
5000 if ( *RExC_parse == '*') { /* (*VERB:ARG) */
5001 char *start_verb = RExC_parse;
5002 STRLEN verb_len = 0;
5003 char *start_arg = NULL;
5004 unsigned char op = 0;
5006 int internal_argval = 0; /* internal_argval is only useful if !argok */
5007 while ( *RExC_parse && *RExC_parse != ')' ) {
5008 if ( *RExC_parse == ':' ) {
5009 start_arg = RExC_parse + 1;
5015 verb_len = RExC_parse - start_verb;
5018 while ( *RExC_parse && *RExC_parse != ')' )
5020 if ( *RExC_parse != ')' )
5021 vFAIL("Unterminated verb pattern argument");
5022 if ( RExC_parse == start_arg )
5025 if ( *RExC_parse != ')' )
5026 vFAIL("Unterminated verb pattern");
5029 switch ( *start_verb ) {
5030 case 'A': /* (*ACCEPT) */
5031 if ( memEQs(start_verb,verb_len,"ACCEPT") ) {
5033 internal_argval = RExC_nestroot;
5036 case 'C': /* (*COMMIT) */
5037 if ( memEQs(start_verb,verb_len,"COMMIT") )
5040 case 'F': /* (*FAIL) */
5041 if ( verb_len==1 || memEQs(start_verb,verb_len,"FAIL") ) {
5046 case ':': /* (*:NAME) */
5047 case 'M': /* (*MARK:NAME) */
5048 if ( verb_len==0 || memEQs(start_verb,verb_len,"MARK") ) {
5053 case 'P': /* (*PRUNE) */
5054 if ( memEQs(start_verb,verb_len,"PRUNE") )
5057 case 'S': /* (*SKIP) */
5058 if ( memEQs(start_verb,verb_len,"SKIP") )
5061 case 'T': /* (*THEN) */
5062 /* [19:06] <TimToady> :: is then */
5063 if ( memEQs(start_verb,verb_len,"THEN") ) {
5065 RExC_seen |= REG_SEEN_CUTGROUP;
5071 vFAIL3("Unknown verb pattern '%.*s'",
5072 verb_len, start_verb);
5075 if ( start_arg && internal_argval ) {
5076 vFAIL3("Verb pattern '%.*s' may not have an argument",
5077 verb_len, start_verb);
5078 } else if ( argok < 0 && !start_arg ) {
5079 vFAIL3("Verb pattern '%.*s' has a mandatory argument",
5080 verb_len, start_verb);
5082 ret = reganode(pRExC_state, op, internal_argval);
5083 if ( ! internal_argval && ! SIZE_ONLY ) {
5085 SV *sv = newSVpvn( start_arg, RExC_parse - start_arg);
5086 ARG(ret) = add_data( pRExC_state, 1, "S" );
5087 RExC_rxi->data->data[ARG(ret)]=(void*)sv;
5094 if (!internal_argval)
5095 RExC_seen |= REG_SEEN_VERBARG;
5096 } else if ( start_arg ) {
5097 vFAIL3("Verb pattern '%.*s' may not have an argument",
5098 verb_len, start_verb);
5100 ret = reg_node(pRExC_state, op);
5102 nextchar(pRExC_state);
5105 if (*RExC_parse == '?') { /* (?...) */
5106 bool is_logical = 0;
5107 const char * const seqstart = RExC_parse;
5110 paren = *RExC_parse++;
5111 ret = NULL; /* For look-ahead/behind. */
5114 case 'P': /* (?P...) variants for those used to PCRE/Python */
5115 paren = *RExC_parse++;
5116 if ( paren == '<') /* (?P<...>) named capture */
5118 else if (paren == '>') { /* (?P>name) named recursion */
5119 goto named_recursion;
5121 else if (paren == '=') { /* (?P=...) named backref */
5122 /* this pretty much dupes the code for \k<NAME> in regatom(), if
5123 you change this make sure you change that */
5124 char* name_start = RExC_parse;
5126 SV *sv_dat = reg_scan_name(pRExC_state,
5127 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5128 if (RExC_parse == name_start || *RExC_parse != ')')
5129 vFAIL2("Sequence %.3s... not terminated",parse_start);
5132 num = add_data( pRExC_state, 1, "S" );
5133 RExC_rxi->data->data[num]=(void*)sv_dat;
5134 SvREFCNT_inc(sv_dat);
5137 ret = reganode(pRExC_state,
5138 (U8)(FOLD ? (LOC ? NREFFL : NREFF) : NREF),
5142 Set_Node_Offset(ret, parse_start+1);
5143 Set_Node_Cur_Length(ret); /* MJD */
5145 nextchar(pRExC_state);
5149 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5151 case '<': /* (?<...) */
5152 if (*RExC_parse == '!')
5154 else if (*RExC_parse != '=')
5160 case '\'': /* (?'...') */
5161 name_start= RExC_parse;
5162 svname = reg_scan_name(pRExC_state,
5163 SIZE_ONLY ? /* reverse test from the others */
5164 REG_RSN_RETURN_NAME :
5165 REG_RSN_RETURN_NULL);
5166 if (RExC_parse == name_start) {
5168 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5171 if (*RExC_parse != paren)
5172 vFAIL2("Sequence (?%c... not terminated",
5173 paren=='>' ? '<' : paren);
5177 if (!svname) /* shouldnt happen */
5179 "panic: reg_scan_name returned NULL");
5180 if (!RExC_paren_names) {
5181 RExC_paren_names= newHV();
5182 sv_2mortal((SV*)RExC_paren_names);
5184 RExC_paren_name_list= newAV();
5185 sv_2mortal((SV*)RExC_paren_name_list);
5188 he_str = hv_fetch_ent( RExC_paren_names, svname, 1, 0 );
5190 sv_dat = HeVAL(he_str);
5192 /* croak baby croak */
5194 "panic: paren_name hash element allocation failed");
5195 } else if ( SvPOK(sv_dat) ) {
5196 /* (?|...) can mean we have dupes so scan to check
5197 its already been stored. Maybe a flag indicating
5198 we are inside such a construct would be useful,
5199 but the arrays are likely to be quite small, so
5200 for now we punt -- dmq */
5201 IV count = SvIV(sv_dat);
5202 I32 *pv = (I32*)SvPVX(sv_dat);
5204 for ( i = 0 ; i < count ; i++ ) {
5205 if ( pv[i] == RExC_npar ) {
5211 pv = (I32*)SvGROW(sv_dat, SvCUR(sv_dat) + sizeof(I32)+1);
5212 SvCUR_set(sv_dat, SvCUR(sv_dat) + sizeof(I32));
5213 pv[count] = RExC_npar;
5217 (void)SvUPGRADE(sv_dat,SVt_PVNV);
5218 sv_setpvn(sv_dat, (char *)&(RExC_npar), sizeof(I32));
5223 if (!av_store(RExC_paren_name_list, RExC_npar, SvREFCNT_inc(svname)))
5224 SvREFCNT_dec(svname);
5227 /*sv_dump(sv_dat);*/
5229 nextchar(pRExC_state);
5231 goto capturing_parens;
5233 RExC_seen |= REG_SEEN_LOOKBEHIND;
5235 case '=': /* (?=...) */
5236 case '!': /* (?!...) */
5237 RExC_seen_zerolen++;
5238 if (*RExC_parse == ')') {
5239 ret=reg_node(pRExC_state, OPFAIL);
5240 nextchar(pRExC_state);
5244 case '|': /* (?|...) */
5245 /* branch reset, behave like a (?:...) except that
5246 buffers in alternations share the same numbers */
5248 after_freeze = freeze_paren = RExC_npar;
5250 case ':': /* (?:...) */
5251 case '>': /* (?>...) */
5253 case '$': /* (?$...) */
5254 case '@': /* (?@...) */
5255 vFAIL2("Sequence (?%c...) not implemented", (int)paren);
5257 case '#': /* (?#...) */
5258 while (*RExC_parse && *RExC_parse != ')')
5260 if (*RExC_parse != ')')
5261 FAIL("Sequence (?#... not terminated");
5262 nextchar(pRExC_state);
5265 case '0' : /* (?0) */
5266 case 'R' : /* (?R) */
5267 if (*RExC_parse != ')')
5268 FAIL("Sequence (?R) not terminated");
5269 ret = reg_node(pRExC_state, GOSTART);
5270 *flagp |= POSTPONED;
5271 nextchar(pRExC_state);
5274 { /* named and numeric backreferences */
5276 case '&': /* (?&NAME) */
5277 parse_start = RExC_parse - 1;
5280 SV *sv_dat = reg_scan_name(pRExC_state,
5281 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5282 num = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
5284 goto gen_recurse_regop;
5287 if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
5289 vFAIL("Illegal pattern");
5291 goto parse_recursion;
5293 case '-': /* (?-1) */
5294 if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
5295 RExC_parse--; /* rewind to let it be handled later */
5299 case '1': case '2': case '3': case '4': /* (?1) */
5300 case '5': case '6': case '7': case '8': case '9':
5303 num = atoi(RExC_parse);
5304 parse_start = RExC_parse - 1; /* MJD */
5305 if (*RExC_parse == '-')
5307 while (isDIGIT(*RExC_parse))
5309 if (*RExC_parse!=')')
5310 vFAIL("Expecting close bracket");
5313 if ( paren == '-' ) {
5315 Diagram of capture buffer numbering.
5316 Top line is the normal capture buffer numbers
5317 Botton line is the negative indexing as from
5321 /(a(x)y)(a(b(c(?-2)d)e)f)(g(h))/
5325 num = RExC_npar + num;
5328 vFAIL("Reference to nonexistent group");
5330 } else if ( paren == '+' ) {
5331 num = RExC_npar + num - 1;
5334 ret = reganode(pRExC_state, GOSUB, num);
5336 if (num > (I32)RExC_rx->nparens) {
5338 vFAIL("Reference to nonexistent group");
5340 ARG2L_SET( ret, RExC_recurse_count++);
5342 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
5343 "Recurse #%"UVuf" to %"IVdf"\n", (UV)ARG(ret), (IV)ARG2L(ret)));
5347 RExC_seen |= REG_SEEN_RECURSE;
5348 Set_Node_Length(ret, 1 + regarglen[OP(ret)]); /* MJD */
5349 Set_Node_Offset(ret, parse_start); /* MJD */
5351 *flagp |= POSTPONED;
5352 nextchar(pRExC_state);
5354 } /* named and numeric backreferences */
5357 case '?': /* (??...) */
5359 if (*RExC_parse != '{') {
5361 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5364 *flagp |= POSTPONED;
5365 paren = *RExC_parse++;
5367 case '{': /* (?{...}) */
5372 char *s = RExC_parse;
5374 RExC_seen_zerolen++;
5375 RExC_seen |= REG_SEEN_EVAL;
5376 while (count && (c = *RExC_parse)) {
5387 if (*RExC_parse != ')') {
5389 vFAIL("Sequence (?{...}) not terminated or not {}-balanced");
5393 OP_4tree *sop, *rop;
5394 SV * const sv = newSVpvn(s, RExC_parse - 1 - s);
5397 Perl_save_re_context(aTHX);
5398 rop = sv_compile_2op(sv, &sop, "re", &pad);
5399 sop->op_private |= OPpREFCOUNTED;
5400 /* re_dup will OpREFCNT_inc */
5401 OpREFCNT_set(sop, 1);
5404 n = add_data(pRExC_state, 3, "nop");
5405 RExC_rxi->data->data[n] = (void*)rop;
5406 RExC_rxi->data->data[n+1] = (void*)sop;
5407 RExC_rxi->data->data[n+2] = (void*)pad;
5410 else { /* First pass */
5411 if (PL_reginterp_cnt < ++RExC_seen_evals
5413 /* No compiled RE interpolated, has runtime
5414 components ===> unsafe. */
5415 FAIL("Eval-group not allowed at runtime, use re 'eval'");
5416 if (PL_tainting && PL_tainted)
5417 FAIL("Eval-group in insecure regular expression");
5418 #if PERL_VERSION > 8
5419 if (IN_PERL_COMPILETIME)
5424 nextchar(pRExC_state);
5426 ret = reg_node(pRExC_state, LOGICAL);
5429 REGTAIL(pRExC_state, ret, reganode(pRExC_state, EVAL, n));
5430 /* deal with the length of this later - MJD */
5433 ret = reganode(pRExC_state, EVAL, n);
5434 Set_Node_Length(ret, RExC_parse - parse_start + 1);
5435 Set_Node_Offset(ret, parse_start);
5438 case '(': /* (?(?{...})...) and (?(?=...)...) */
5441 if (RExC_parse[0] == '?') { /* (?(?...)) */
5442 if (RExC_parse[1] == '=' || RExC_parse[1] == '!'
5443 || RExC_parse[1] == '<'
5444 || RExC_parse[1] == '{') { /* Lookahead or eval. */
5447 ret = reg_node(pRExC_state, LOGICAL);
5450 REGTAIL(pRExC_state, ret, reg(pRExC_state, 1, &flag,depth+1));
5454 else if ( RExC_parse[0] == '<' /* (?(<NAME>)...) */
5455 || RExC_parse[0] == '\'' ) /* (?('NAME')...) */
5457 char ch = RExC_parse[0] == '<' ? '>' : '\'';
5458 char *name_start= RExC_parse++;
5460 SV *sv_dat=reg_scan_name(pRExC_state,
5461 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5462 if (RExC_parse == name_start || *RExC_parse != ch)
5463 vFAIL2("Sequence (?(%c... not terminated",
5464 (ch == '>' ? '<' : ch));
5467 num = add_data( pRExC_state, 1, "S" );
5468 RExC_rxi->data->data[num]=(void*)sv_dat;
5469 SvREFCNT_inc(sv_dat);
5471 ret = reganode(pRExC_state,NGROUPP,num);
5472 goto insert_if_check_paren;
5474 else if (RExC_parse[0] == 'D' &&
5475 RExC_parse[1] == 'E' &&
5476 RExC_parse[2] == 'F' &&
5477 RExC_parse[3] == 'I' &&
5478 RExC_parse[4] == 'N' &&
5479 RExC_parse[5] == 'E')
5481 ret = reganode(pRExC_state,DEFINEP,0);
5484 goto insert_if_check_paren;
5486 else if (RExC_parse[0] == 'R') {
5489 if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
5490 parno = atoi(RExC_parse++);
5491 while (isDIGIT(*RExC_parse))
5493 } else if (RExC_parse[0] == '&') {
5496 sv_dat = reg_scan_name(pRExC_state,
5497 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5498 parno = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
5500 ret = reganode(pRExC_state,INSUBP,parno);
5501 goto insert_if_check_paren;
5503 else if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
5506 parno = atoi(RExC_parse++);
5508 while (isDIGIT(*RExC_parse))
5510 ret = reganode(pRExC_state, GROUPP, parno);
5512 insert_if_check_paren:
5513 if ((c = *nextchar(pRExC_state)) != ')')
5514 vFAIL("Switch condition not recognized");
5516 REGTAIL(pRExC_state, ret, reganode(pRExC_state, IFTHEN, 0));
5517 br = regbranch(pRExC_state, &flags, 1,depth+1);
5519 br = reganode(pRExC_state, LONGJMP, 0);
5521 REGTAIL(pRExC_state, br, reganode(pRExC_state, LONGJMP, 0));
5522 c = *nextchar(pRExC_state);
5527 vFAIL("(?(DEFINE)....) does not allow branches");
5528 lastbr = reganode(pRExC_state, IFTHEN, 0); /* Fake one for optimizer. */
5529 regbranch(pRExC_state, &flags, 1,depth+1);
5530 REGTAIL(pRExC_state, ret, lastbr);
5533 c = *nextchar(pRExC_state);
5538 vFAIL("Switch (?(condition)... contains too many branches");
5539 ender = reg_node(pRExC_state, TAIL);
5540 REGTAIL(pRExC_state, br, ender);
5542 REGTAIL(pRExC_state, lastbr, ender);
5543 REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender);
5546 REGTAIL(pRExC_state, ret, ender);
5547 RExC_size++; /* XXX WHY do we need this?!!
5548 For large programs it seems to be required
5549 but I can't figure out why. -- dmq*/
5553 vFAIL2("Unknown switch condition (?(%.2s", RExC_parse);
5557 RExC_parse--; /* for vFAIL to print correctly */
5558 vFAIL("Sequence (? incomplete");
5562 parse_flags: /* (?i) */
5564 U32 posflags = 0, negflags = 0;
5565 U32 *flagsp = &posflags;
5567 while (*RExC_parse) {
5568 /* && strchr("iogcmsx", *RExC_parse) */
5569 /* (?g), (?gc) and (?o) are useless here
5570 and must be globally applied -- japhy */
5571 switch (*RExC_parse) {
5572 CASE_STD_PMMOD_FLAGS_PARSE_SET(flagsp);
5575 if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
5576 const I32 wflagbit = *RExC_parse == 'o' ? WASTED_O : WASTED_G;
5577 if (! (wastedflags & wflagbit) ) {
5578 wastedflags |= wflagbit;
5581 "Useless (%s%c) - %suse /%c modifier",
5582 flagsp == &negflags ? "?-" : "?",
5584 flagsp == &negflags ? "don't " : "",
5592 if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
5593 if (! (wastedflags & WASTED_C) ) {
5594 wastedflags |= WASTED_GC;
5597 "Useless (%sc) - %suse /gc modifier",
5598 flagsp == &negflags ? "?-" : "?",
5599 flagsp == &negflags ? "don't " : ""
5605 if (flagsp == &negflags) {
5606 if (SIZE_ONLY && ckWARN(WARN_REGEXP))
5607 vWARN(RExC_parse + 1,"Useless use of (?-k)");
5609 *flagsp |= RXf_PMf_KEEPCOPY;
5613 if (flagsp == &negflags) {
5615 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5619 wastedflags = 0; /* reset so (?g-c) warns twice */
5625 RExC_flags |= posflags;
5626 RExC_flags &= ~negflags;
5627 nextchar(pRExC_state);
5638 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5643 }} /* one for the default block, one for the switch */
5650 ret = reganode(pRExC_state, OPEN, parno);
5653 RExC_nestroot = parno;
5654 if (RExC_seen & REG_SEEN_RECURSE
5655 && !RExC_open_parens[parno-1])
5657 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
5658 "Setting open paren #%"IVdf" to %d\n",
5659 (IV)parno, REG_NODE_NUM(ret)));
5660 RExC_open_parens[parno-1]= ret;
5663 Set_Node_Length(ret, 1); /* MJD */
5664 Set_Node_Offset(ret, RExC_parse); /* MJD */
5672 /* Pick up the branches, linking them together. */
5673 parse_start = RExC_parse; /* MJD */
5674 br = regbranch(pRExC_state, &flags, 1,depth+1);
5675 /* branch_len = (paren != 0); */
5679 if (*RExC_parse == '|') {
5680 if (!SIZE_ONLY && RExC_extralen) {
5681 reginsert(pRExC_state, BRANCHJ, br, depth+1);
5684 reginsert(pRExC_state, BRANCH, br, depth+1);
5685 Set_Node_Length(br, paren != 0);
5686 Set_Node_Offset_To_R(br-RExC_emit_start, parse_start-RExC_start);
5690 RExC_extralen += 1; /* For BRANCHJ-BRANCH. */
5692 else if (paren == ':') {
5693 *flagp |= flags&SIMPLE;
5695 if (is_open) { /* Starts with OPEN. */
5696 REGTAIL(pRExC_state, ret, br); /* OPEN -> first. */
5698 else if (paren != '?') /* Not Conditional */
5700 *flagp |= flags & (SPSTART | HASWIDTH | POSTPONED);
5702 while (*RExC_parse == '|') {
5703 if (!SIZE_ONLY && RExC_extralen) {
5704 ender = reganode(pRExC_state, LONGJMP,0);
5705 REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender); /* Append to the previous. */
5708 RExC_extralen += 2; /* Account for LONGJMP. */
5709 nextchar(pRExC_state);
5711 if (RExC_npar > after_freeze)
5712 after_freeze = RExC_npar;
5713 RExC_npar = freeze_paren;
5715 br = regbranch(pRExC_state, &flags, 0, depth+1);
5719 REGTAIL(pRExC_state, lastbr, br); /* BRANCH -> BRANCH. */
5721 *flagp |= flags & (SPSTART | HASWIDTH | POSTPONED);
5724 if (have_branch || paren != ':') {
5725 /* Make a closing node, and hook it on the end. */
5728 ender = reg_node(pRExC_state, TAIL);
5731 ender = reganode(pRExC_state, CLOSE, parno);
5732 if (!SIZE_ONLY && RExC_seen & REG_SEEN_RECURSE) {
5733 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
5734 "Setting close paren #%"IVdf" to %d\n",
5735 (IV)parno, REG_NODE_NUM(ender)));
5736 RExC_close_parens[parno-1]= ender;
5737 if (RExC_nestroot == parno)
5740 Set_Node_Offset(ender,RExC_parse+1); /* MJD */
5741 Set_Node_Length(ender,1); /* MJD */
5747 *flagp &= ~HASWIDTH;
5750 ender = reg_node(pRExC_state, SUCCEED);
5753 ender = reg_node(pRExC_state, END);
5755 assert(!RExC_opend); /* there can only be one! */
5760 REGTAIL(pRExC_state, lastbr, ender);
5762 if (have_branch && !SIZE_ONLY) {
5764 RExC_seen |= REG_TOP_LEVEL_BRANCHES;
5766 /* Hook the tails of the branches to the closing node. */
5767 for (br = ret; br; br = regnext(br)) {
5768 const U8 op = PL_regkind[OP(br)];
5770 REGTAIL_STUDY(pRExC_state, NEXTOPER(br), ender);
5772 else if (op == BRANCHJ) {
5773 REGTAIL_STUDY(pRExC_state, NEXTOPER(NEXTOPER(br)), ender);
5781 static const char parens[] = "=!<,>";
5783 if (paren && (p = strchr(parens, paren))) {
5784 U8 node = ((p - parens) % 2) ? UNLESSM : IFMATCH;
5785 int flag = (p - parens) > 1;
5788 node = SUSPEND, flag = 0;
5789 reginsert(pRExC_state, node,ret, depth+1);
5790 Set_Node_Cur_Length(ret);
5791 Set_Node_Offset(ret, parse_start + 1);
5793 REGTAIL_STUDY(pRExC_state, ret, reg_node(pRExC_state, TAIL));
5797 /* Check for proper termination. */
5799 RExC_flags = oregflags;
5800 if (RExC_parse >= RExC_end || *nextchar(pRExC_state) != ')') {
5801 RExC_parse = oregcomp_parse;
5802 vFAIL("Unmatched (");
5805 else if (!paren && RExC_parse < RExC_end) {
5806 if (*RExC_parse == ')') {
5808 vFAIL("Unmatched )");
5811 FAIL("Junk on end of regexp"); /* "Can't happen". */
5815 RExC_npar = after_freeze;
5820 - regbranch - one alternative of an | operator
5822 * Implements the concatenation operator.
5825 S_regbranch(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, I32 first, U32 depth)
5828 register regnode *ret;
5829 register regnode *chain = NULL;
5830 register regnode *latest;
5831 I32 flags = 0, c = 0;
5832 GET_RE_DEBUG_FLAGS_DECL;
5833 DEBUG_PARSE("brnc");
5838 if (!SIZE_ONLY && RExC_extralen)
5839 ret = reganode(pRExC_state, BRANCHJ,0);
5841 ret = reg_node(pRExC_state, BRANCH);
5842 Set_Node_Length(ret, 1);
5846 if (!first && SIZE_ONLY)
5847 RExC_extralen += 1; /* BRANCHJ */
5849 *flagp = WORST; /* Tentatively. */
5852 nextchar(pRExC_state);
5853 while (RExC_parse < RExC_end && *RExC_parse != '|' && *RExC_parse != ')') {
5855 latest = regpiece(pRExC_state, &flags,depth+1);
5856 if (latest == NULL) {
5857 if (flags & TRYAGAIN)
5861 else if (ret == NULL)
5863 *flagp |= flags&(HASWIDTH|POSTPONED);
5864 if (chain == NULL) /* First piece. */
5865 *flagp |= flags&SPSTART;
5868 REGTAIL(pRExC_state, chain, latest);
5873 if (chain == NULL) { /* Loop ran zero times. */
5874 chain = reg_node(pRExC_state, NOTHING);
5879 *flagp |= flags&SIMPLE;
5886 - regpiece - something followed by possible [*+?]
5888 * Note that the branching code sequences used for ? and the general cases
5889 * of * and + are somewhat optimized: they use the same NOTHING node as
5890 * both the endmarker for their branch list and the body of the last branch.
5891 * It might seem that this node could be dispensed with entirely, but the
5892 * endmarker role is not redundant.
5895 S_regpiece(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
5898 register regnode *ret;
5900 register char *next;
5902 const char * const origparse = RExC_parse;
5904 I32 max = REG_INFTY;
5906 const char *maxpos = NULL;
5907 GET_RE_DEBUG_FLAGS_DECL;
5908 DEBUG_PARSE("piec");
5910 ret = regatom(pRExC_state, &flags,depth+1);
5912 if (flags & TRYAGAIN)
5919 if (op == '{' && regcurly(RExC_parse)) {
5921 parse_start = RExC_parse; /* MJD */
5922 next = RExC_parse + 1;
5923 while (isDIGIT(*next) || *next == ',') {
5932 if (*next == '}') { /* got one */
5936 min = atoi(RExC_parse);
5940 maxpos = RExC_parse;
5942 if (!max && *maxpos != '0')
5943 max = REG_INFTY; /* meaning "infinity" */
5944 else if (max >= REG_INFTY)
5945 vFAIL2("Quantifier in {,} bigger than %d", REG_INFTY - 1);
5947 nextchar(pRExC_state);
5950 if ((flags&SIMPLE)) {
5951 RExC_naughty += 2 + RExC_naughty / 2;
5952 reginsert(pRExC_state, CURLY, ret, depth+1);
5953 Set_Node_Offset(ret, parse_start+1); /* MJD */
5954 Set_Node_Cur_Length(ret);
5957 regnode * const w = reg_node(pRExC_state, WHILEM);
5960 REGTAIL(pRExC_state, ret, w);
5961 if (!SIZE_ONLY && RExC_extralen) {
5962 reginsert(pRExC_state, LONGJMP,ret, depth+1);
5963 reginsert(pRExC_state, NOTHING,ret, depth+1);
5964 NEXT_OFF(ret) = 3; /* Go over LONGJMP. */
5966 reginsert(pRExC_state, CURLYX,ret, depth+1);
5968 Set_Node_Offset(ret, parse_start+1);
5969 Set_Node_Length(ret,
5970 op == '{' ? (RExC_parse - parse_start) : 1);
5972 if (!SIZE_ONLY && RExC_extralen)
5973 NEXT_OFF(ret) = 3; /* Go over NOTHING to LONGJMP. */
5974 REGTAIL(pRExC_state, ret, reg_node(pRExC_state, NOTHING));
5976 RExC_whilem_seen++, RExC_extralen += 3;
5977 RExC_naughty += 4 + RExC_naughty; /* compound interest */
5985 if (max && max < min)
5986 vFAIL("Can't do {n,m} with n > m");
5988 ARG1_SET(ret, (U16)min);
5989 ARG2_SET(ret, (U16)max);
6001 #if 0 /* Now runtime fix should be reliable. */
6003 /* if this is reinstated, don't forget to put this back into perldiag:
6005 =item Regexp *+ operand could be empty at {#} in regex m/%s/
6007 (F) The part of the regexp subject to either the * or + quantifier
6008 could match an empty string. The {#} shows in the regular
6009 expression about where the problem was discovered.
6013 if (!(flags&HASWIDTH) && op != '?')
6014 vFAIL("Regexp *+ operand could be empty");
6017 parse_start = RExC_parse;
6018 nextchar(pRExC_state);
6020 *flagp = (op != '+') ? (WORST|SPSTART|HASWIDTH) : (WORST|HASWIDTH);
6022 if (op == '*' && (flags&SIMPLE)) {
6023 reginsert(pRExC_state, STAR, ret, depth+1);
6027 else if (op == '*') {
6031 else if (op == '+' && (flags&SIMPLE)) {
6032 reginsert(pRExC_state, PLUS, ret, depth+1);
6036 else if (op == '+') {
6040 else if (op == '?') {
6045 if (!SIZE_ONLY && !(flags&(HASWIDTH|POSTPONED)) && max > REG_INFTY/3 && ckWARN(WARN_REGEXP)) {
6047 "%.*s matches null string many times",
6048 (int)(RExC_parse >= origparse ? RExC_parse - origparse : 0),
6052 if (RExC_parse < RExC_end && *RExC_parse == '?') {
6053 nextchar(pRExC_state);
6054 reginsert(pRExC_state, MINMOD, ret, depth+1);
6055 REGTAIL(pRExC_state, ret, ret + NODE_STEP_REGNODE);
6057 #ifndef REG_ALLOW_MINMOD_SUSPEND
6060 if (RExC_parse < RExC_end && *RExC_parse == '+') {
6062 nextchar(pRExC_state);
6063 ender = reg_node(pRExC_state, SUCCEED);
6064 REGTAIL(pRExC_state, ret, ender);
6065 reginsert(pRExC_state, SUSPEND, ret, depth+1);
6067 ender = reg_node(pRExC_state, TAIL);
6068 REGTAIL(pRExC_state, ret, ender);
6072 if (RExC_parse < RExC_end && ISMULT2(RExC_parse)) {
6074 vFAIL("Nested quantifiers");
6081 /* reg_namedseq(pRExC_state,UVp)
6083 This is expected to be called by a parser routine that has
6084 recognized'\N' and needs to handle the rest. RExC_parse is
6085 expected to point at the first char following the N at the time
6088 If valuep is non-null then it is assumed that we are parsing inside
6089 of a charclass definition and the first codepoint in the resolved
6090 string is returned via *valuep and the routine will return NULL.
6091 In this mode if a multichar string is returned from the charnames
6092 handler a warning will be issued, and only the first char in the
6093 sequence will be examined. If the string returned is zero length
6094 then the value of *valuep is undefined and NON-NULL will
6095 be returned to indicate failure. (This will NOT be a valid pointer
6098 If value is null then it is assumed that we are parsing normal text
6099 and inserts a new EXACT node into the program containing the resolved
6100 string and returns a pointer to the new node. If the string is
6101 zerolength a NOTHING node is emitted.
6103 On success RExC_parse is set to the char following the endbrace.
6104 Parsing failures will generate a fatal errorvia vFAIL(...)
6106 NOTE: We cache all results from the charnames handler locally in
6107 the RExC_charnames hash (created on first use) to prevent a charnames
6108 handler from playing silly-buggers and returning a short string and
6109 then a long string for a given pattern. Since the regexp program
6110 size is calculated during an initial parse this would result
6111 in a buffer overrun so we cache to prevent the charname result from
6112 changing during the course of the parse.
6116 S_reg_namedseq(pTHX_ RExC_state_t *pRExC_state, UV *valuep)
6118 char * name; /* start of the content of the name */
6119 char * endbrace; /* endbrace following the name */
6122 STRLEN len; /* this has various purposes throughout the code */
6123 bool cached = 0; /* if this is true then we shouldn't refcount dev sv_str */
6124 regnode *ret = NULL;
6126 if (*RExC_parse != '{') {
6127 vFAIL("Missing braces on \\N{}");
6129 name = RExC_parse+1;
6130 endbrace = strchr(RExC_parse, '}');
6133 vFAIL("Missing right brace on \\N{}");
6135 RExC_parse = endbrace + 1;
6138 /* RExC_parse points at the beginning brace,
6139 endbrace points at the last */
6140 if ( name[0]=='U' && name[1]=='+' ) {
6141 /* its a "unicode hex" notation {U+89AB} */
6142 I32 fl = PERL_SCAN_ALLOW_UNDERSCORES
6143 | PERL_SCAN_DISALLOW_PREFIX
6144 | (SIZE_ONLY ? PERL_SCAN_SILENT_ILLDIGIT : 0);
6146 len = (STRLEN)(endbrace - name - 2);
6147 cp = grok_hex(name + 2, &len, &fl, NULL);
6148 if ( len != (STRLEN)(endbrace - name - 2) ) {
6157 sv_str= Perl_newSVpvf_nocontext("%c",(int)cp);
6159 /* fetch the charnames handler for this scope */
6160 HV * const table = GvHV(PL_hintgv);
6162 hv_fetchs(table, "charnames", FALSE) :
6164 SV *cv= cvp ? *cvp : NULL;
6167 /* create an SV with the name as argument */
6168 sv_name = newSVpvn(name, endbrace - name);
6170 if (!table || !(PL_hints & HINT_LOCALIZE_HH)) {
6171 vFAIL2("Constant(\\N{%s}) unknown: "
6172 "(possibly a missing \"use charnames ...\")",
6175 if (!cvp || !SvOK(*cvp)) { /* when $^H{charnames} = undef; */
6176 vFAIL2("Constant(\\N{%s}): "
6177 "$^H{charnames} is not defined",SvPVX(sv_name));
6182 if (!RExC_charnames) {
6183 /* make sure our cache is allocated */
6184 RExC_charnames = newHV();
6185 sv_2mortal((SV*)RExC_charnames);
6187 /* see if we have looked this one up before */
6188 he_str = hv_fetch_ent( RExC_charnames, sv_name, 0, 0 );
6190 sv_str = HeVAL(he_str);
6203 count= call_sv(cv, G_SCALAR);
6205 if (count == 1) { /* XXXX is this right? dmq */
6207 SvREFCNT_inc_simple_void(sv_str);
6215 if ( !sv_str || !SvOK(sv_str) ) {
6216 vFAIL2("Constant(\\N{%s}): Call to &{$^H{charnames}} "
6217 "did not return a defined value",SvPVX(sv_name));
6219 if (hv_store_ent( RExC_charnames, sv_name, sv_str, 0))
6224 char *p = SvPV(sv_str, len);
6227 if ( SvUTF8(sv_str) ) {
6228 *valuep = utf8_to_uvchr((U8*)p, &numlen);
6232 We have to turn on utf8 for high bit chars otherwise
6233 we get failures with
6235 "ss" =~ /[\N{LATIN SMALL LETTER SHARP S}]/i
6236 "SS" =~ /[\N{LATIN SMALL LETTER SHARP S}]/i
6238 This is different from what \x{} would do with the same
6239 codepoint, where the condition is > 0xFF.
6246 /* warn if we havent used the whole string? */
6248 if (numlen<len && SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6250 "Ignoring excess chars from \\N{%s} in character class",
6254 } else if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6256 "Ignoring zero length \\N{%s} in character class",
6261 SvREFCNT_dec(sv_name);
6263 SvREFCNT_dec(sv_str);
6264 return len ? NULL : (regnode *)&len;
6265 } else if(SvCUR(sv_str)) {
6271 char * parse_start = name-3; /* needed for the offsets */
6273 GET_RE_DEBUG_FLAGS_DECL; /* needed for the offsets */
6275 ret = reg_node(pRExC_state,
6276 (U8)(FOLD ? (LOC ? EXACTFL : EXACTF) : EXACT));
6279 if ( RExC_utf8 && !SvUTF8(sv_str) ) {
6280 sv_utf8_upgrade(sv_str);
6281 } else if ( !RExC_utf8 && SvUTF8(sv_str) ) {
6285 p = SvPV(sv_str, len);
6287 /* len is the length written, charlen is the size the char read */
6288 for ( len = 0; p < pend; p += charlen ) {
6290 UV uvc = utf8_to_uvchr((U8*)p, &charlen);
6292 STRLEN foldlen,numlen;
6293 U8 tmpbuf[UTF8_MAXBYTES_CASE+1], *foldbuf;
6294 uvc = toFOLD_uni(uvc, tmpbuf, &foldlen);
6295 /* Emit all the Unicode characters. */
6297 for (foldbuf = tmpbuf;
6301 uvc = utf8_to_uvchr(foldbuf, &numlen);
6303 const STRLEN unilen = reguni(pRExC_state, uvc, s);
6306 /* In EBCDIC the numlen
6307 * and unilen can differ. */
6309 if (numlen >= foldlen)
6313 break; /* "Can't happen." */
6316 const STRLEN unilen = reguni(pRExC_state, uvc, s);
6328 RExC_size += STR_SZ(len);
6331 RExC_emit += STR_SZ(len);
6333 Set_Node_Cur_Length(ret); /* MJD */
6335 nextchar(pRExC_state);
6337 ret = reg_node(pRExC_state,NOTHING);
6340 SvREFCNT_dec(sv_str);
6343 SvREFCNT_dec(sv_name);
6353 * It returns the code point in utf8 for the value in *encp.
6354 * value: a code value in the source encoding
6355 * encp: a pointer to an Encode object
6357 * If the result from Encode is not a single character,
6358 * it returns U+FFFD (Replacement character) and sets *encp to NULL.
6361 S_reg_recode(pTHX_ const char value, SV **encp)
6364 SV * const sv = sv_2mortal(newSVpvn(&value, numlen));
6365 const char * const s = encp && *encp ? sv_recode_to_utf8(sv, *encp)
6367 const STRLEN newlen = SvCUR(sv);
6368 UV uv = UNICODE_REPLACEMENT;
6372 ? utf8n_to_uvchr((U8*)s, newlen, &numlen, UTF8_ALLOW_DEFAULT)
6375 if (!newlen || numlen != newlen) {
6376 uv = UNICODE_REPLACEMENT;
6385 - regatom - the lowest level
6387 Try to identify anything special at the start of the pattern. If there
6388 is, then handle it as required. This may involve generating a single regop,
6389 such as for an assertion; or it may involve recursing, such as to
6390 handle a () structure.
6392 If the string doesn't start with something special then we gobble up
6393 as much literal text as we can.
6395 Once we have been able to handle whatever type of thing started the
6396 sequence, we return.
6398 Note: we have to be careful with escapes, as they can be both literal
6399 and special, and in the case of \10 and friends can either, depending
6400 on context. Specifically there are two seperate switches for handling
6401 escape sequences, with the one for handling literal escapes requiring
6402 a dummy entry for all of the special escapes that are actually handled
6407 S_regatom(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
6410 register regnode *ret = NULL;
6412 char *parse_start = RExC_parse;
6413 GET_RE_DEBUG_FLAGS_DECL;
6414 DEBUG_PARSE("atom");
6415 *flagp = WORST; /* Tentatively. */
6419 switch (*RExC_parse) {
6421 RExC_seen_zerolen++;
6422 nextchar(pRExC_state);
6423 if (RExC_flags & RXf_PMf_MULTILINE)
6424 ret = reg_node(pRExC_state, MBOL);
6425 else if (RExC_flags & RXf_PMf_SINGLELINE)
6426 ret = reg_node(pRExC_state, SBOL);
6428 ret = reg_node(pRExC_state, BOL);
6429 Set_Node_Length(ret, 1); /* MJD */
6432 nextchar(pRExC_state);
6434 RExC_seen_zerolen++;
6435 if (RExC_flags & RXf_PMf_MULTILINE)
6436 ret = reg_node(pRExC_state, MEOL);
6437 else if (RExC_flags & RXf_PMf_SINGLELINE)
6438 ret = reg_node(pRExC_state, SEOL);
6440 ret = reg_node(pRExC_state, EOL);
6441 Set_Node_Length(ret, 1); /* MJD */
6444 nextchar(pRExC_state);
6445 if (RExC_flags & RXf_PMf_SINGLELINE)
6446 ret = reg_node(pRExC_state, SANY);
6448 ret = reg_node(pRExC_state, REG_ANY);
6449 *flagp |= HASWIDTH|SIMPLE;
6451 Set_Node_Length(ret, 1); /* MJD */
6455 char * const oregcomp_parse = ++RExC_parse;
6456 ret = regclass(pRExC_state,depth+1);
6457 if (*RExC_parse != ']') {
6458 RExC_parse = oregcomp_parse;
6459 vFAIL("Unmatched [");
6461 nextchar(pRExC_state);
6462 *flagp |= HASWIDTH|SIMPLE;
6463 Set_Node_Length(ret, RExC_parse - oregcomp_parse + 1); /* MJD */
6467 nextchar(pRExC_state);
6468 ret = reg(pRExC_state, 1, &flags,depth+1);
6470 if (flags & TRYAGAIN) {
6471 if (RExC_parse == RExC_end) {
6472 /* Make parent create an empty node if needed. */
6480 *flagp |= flags&(HASWIDTH|SPSTART|SIMPLE|POSTPONED);
6484 if (flags & TRYAGAIN) {
6488 vFAIL("Internal urp");
6489 /* Supposed to be caught earlier. */
6492 if (!regcurly(RExC_parse)) {
6501 vFAIL("Quantifier follows nothing");
6506 This switch handles escape sequences that resolve to some kind
6507 of special regop and not to literal text. Escape sequnces that
6508 resolve to literal text are handled below in the switch marked
6511 Every entry in this switch *must* have a corresponding entry
6512 in the literal escape switch. However, the opposite is not
6513 required, as the default for this switch is to jump to the
6514 literal text handling code.
6516 switch (*++RExC_parse) {
6517 /* Special Escapes */
6519 RExC_seen_zerolen++;
6520 ret = reg_node(pRExC_state, SBOL);
6522 goto finish_meta_pat;
6524 ret = reg_node(pRExC_state, GPOS);
6525 RExC_seen |= REG_SEEN_GPOS;
6527 goto finish_meta_pat;
6529 RExC_seen_zerolen++;
6530 ret = reg_node(pRExC_state, KEEPS);
6532 goto finish_meta_pat;
6534 ret = reg_node(pRExC_state, SEOL);
6536 RExC_seen_zerolen++; /* Do not optimize RE away */
6537 goto finish_meta_pat;
6539 ret = reg_node(pRExC_state, EOS);
6541 RExC_seen_zerolen++; /* Do not optimize RE away */
6542 goto finish_meta_pat;
6544 ret = reg_node(pRExC_state, CANY);
6545 RExC_seen |= REG_SEEN_CANY;
6546 *flagp |= HASWIDTH|SIMPLE;
6547 goto finish_meta_pat;
6549 ret = reg_node(pRExC_state, CLUMP);
6551 goto finish_meta_pat;
6553 ret = reg_node(pRExC_state, (U8)(LOC ? ALNUML : ALNUM));
6554 *flagp |= HASWIDTH|SIMPLE;
6555 goto finish_meta_pat;
6557 ret = reg_node(pRExC_state, (U8)(LOC ? NALNUML : NALNUM));
6558 *flagp |= HASWIDTH|SIMPLE;
6559 goto finish_meta_pat;
6561 RExC_seen_zerolen++;
6562 RExC_seen |= REG_SEEN_LOOKBEHIND;
6563 ret = reg_node(pRExC_state, (U8)(LOC ? BOUNDL : BOUND));
6565 goto finish_meta_pat;
6567 RExC_seen_zerolen++;
6568 RExC_seen |= REG_SEEN_LOOKBEHIND;
6569 ret = reg_node(pRExC_state, (U8)(LOC ? NBOUNDL : NBOUND));
6571 goto finish_meta_pat;
6573 ret = reg_node(pRExC_state, (U8)(LOC ? SPACEL : SPACE));
6574 *flagp |= HASWIDTH|SIMPLE;
6575 goto finish_meta_pat;
6577 ret = reg_node(pRExC_state, (U8)(LOC ? NSPACEL : NSPACE));
6578 *flagp |= HASWIDTH|SIMPLE;
6579 goto finish_meta_pat;
6581 ret = reg_node(pRExC_state, DIGIT);
6582 *flagp |= HASWIDTH|SIMPLE;
6583 goto finish_meta_pat;
6585 ret = reg_node(pRExC_state, NDIGIT);
6586 *flagp |= HASWIDTH|SIMPLE;
6587 goto finish_meta_pat;
6589 ret = reganode(pRExC_state, PRUNE, 0);
6592 goto finish_meta_pat;
6594 ret = reganode(pRExC_state, SKIP, 0);
6598 nextchar(pRExC_state);
6599 Set_Node_Length(ret, 2); /* MJD */
6604 char* const oldregxend = RExC_end;
6606 char* parse_start = RExC_parse - 2;
6609 if (RExC_parse[1] == '{') {
6610 /* a lovely hack--pretend we saw [\pX] instead */
6611 RExC_end = strchr(RExC_parse, '}');
6613 const U8 c = (U8)*RExC_parse;
6615 RExC_end = oldregxend;
6616 vFAIL2("Missing right brace on \\%c{}", c);
6621 RExC_end = RExC_parse + 2;
6622 if (RExC_end > oldregxend)
6623 RExC_end = oldregxend;
6627 ret = regclass(pRExC_state,depth+1);
6629 RExC_end = oldregxend;
6632 Set_Node_Offset(ret, parse_start + 2);
6633 Set_Node_Cur_Length(ret);
6634 nextchar(pRExC_state);
6635 *flagp |= HASWIDTH|SIMPLE;
6639 /* Handle \N{NAME} here and not below because it can be
6640 multicharacter. join_exact() will join them up later on.
6641 Also this makes sure that things like /\N{BLAH}+/ and
6642 \N{BLAH} being multi char Just Happen. dmq*/
6644 ret= reg_namedseq(pRExC_state, NULL);
6646 case 'k': /* Handle \k<NAME> and \k'NAME' */
6649 char ch= RExC_parse[1];
6650 if (ch != '<' && ch != '\'' && ch != '{') {
6652 vFAIL2("Sequence %.2s... not terminated",parse_start);
6654 /* this pretty much dupes the code for (?P=...) in reg(), if
6655 you change this make sure you change that */
6656 char* name_start = (RExC_parse += 2);
6658 SV *sv_dat = reg_scan_name(pRExC_state,
6659 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
6660 ch= (ch == '<') ? '>' : (ch == '{') ? '}' : '\'';
6661 if (RExC_parse == name_start || *RExC_parse != ch)
6662 vFAIL2("Sequence %.3s... not terminated",parse_start);
6665 num = add_data( pRExC_state, 1, "S" );
6666 RExC_rxi->data->data[num]=(void*)sv_dat;
6667 SvREFCNT_inc(sv_dat);
6671 ret = reganode(pRExC_state,
6672 (U8)(FOLD ? (LOC ? NREFFL : NREFF) : NREF),
6676 /* override incorrect value set in reganode MJD */
6677 Set_Node_Offset(ret, parse_start+1);
6678 Set_Node_Cur_Length(ret); /* MJD */
6679 nextchar(pRExC_state);
6685 case '1': case '2': case '3': case '4':
6686 case '5': case '6': case '7': case '8': case '9':
6689 bool isg = *RExC_parse == 'g';
6694 if (*RExC_parse == '{') {
6698 if (*RExC_parse == '-') {
6702 if (hasbrace && !isDIGIT(*RExC_parse)) {
6703 if (isrel) RExC_parse--;
6705 goto parse_named_seq;
6707 num = atoi(RExC_parse);
6709 num = RExC_npar - num;
6711 vFAIL("Reference to nonexistent or unclosed group");
6713 if (!isg && num > 9 && num >= RExC_npar)
6716 char * const parse_start = RExC_parse - 1; /* MJD */
6717 while (isDIGIT(*RExC_parse))
6719 if (parse_start == RExC_parse - 1)
6720 vFAIL("Unterminated \\g... pattern");
6722 if (*RExC_parse != '}')
6723 vFAIL("Unterminated \\g{...} pattern");
6727 if (num > (I32)RExC_rx->nparens)
6728 vFAIL("Reference to nonexistent group");
6731 ret = reganode(pRExC_state,
6732 (U8)(FOLD ? (LOC ? REFFL : REFF) : REF),
6736 /* override incorrect value set in reganode MJD */
6737 Set_Node_Offset(ret, parse_start+1);
6738 Set_Node_Cur_Length(ret); /* MJD */
6740 nextchar(pRExC_state);
6745 if (RExC_parse >= RExC_end)
6746 FAIL("Trailing \\");
6749 /* Do not generate "unrecognized" warnings here, we fall
6750 back into the quick-grab loop below */
6757 if (RExC_flags & RXf_PMf_EXTENDED) {
6758 if ( reg_skipcomment( pRExC_state ) )
6764 register STRLEN len;
6769 U8 tmpbuf[UTF8_MAXBYTES_CASE+1], *foldbuf;
6771 parse_start = RExC_parse - 1;
6777 ret = reg_node(pRExC_state,
6778 (U8)(FOLD ? (LOC ? EXACTFL : EXACTF) : EXACT));
6780 for (len = 0, p = RExC_parse - 1;
6781 len < 127 && p < RExC_end;
6784 char * const oldp = p;
6786 if (RExC_flags & RXf_PMf_EXTENDED)
6787 p = regwhite( pRExC_state, p );
6798 /* Literal Escapes Switch
6800 This switch is meant to handle escape sequences that
6801 resolve to a literal character.
6803 Every escape sequence that represents something
6804 else, like an assertion or a char class, is handled
6805 in the switch marked 'Special Escapes' above in this
6806 routine, but also has an entry here as anything that
6807 isn't explicitly mentioned here will be treated as
6808 an unescaped equivalent literal.
6812 /* These are all the special escapes. */
6813 case 'A': /* Start assertion */
6814 case 'b': case 'B': /* Word-boundary assertion*/
6815 case 'C': /* Single char !DANGEROUS! */
6816 case 'd': case 'D': /* digit class */
6817 case 'g': case 'G': /* generic-backref, pos assertion */
6818 case 'k': case 'K': /* named backref, keep marker */
6819 case 'N': /* named char sequence */
6820 case 'p': case 'P': /* unicode property */
6821 case 's': case 'S': /* space class */
6822 case 'v': case 'V': /* (*PRUNE) and (*SKIP) */
6823 case 'w': case 'W': /* word class */
6824 case 'X': /* eXtended Unicode "combining character sequence" */
6825 case 'z': case 'Z': /* End of line/string assertion */
6829 /* Anything after here is an escape that resolves to a
6830 literal. (Except digits, which may or may not)
6849 ender = ASCII_TO_NATIVE('\033');
6853 ender = ASCII_TO_NATIVE('\007');
6858 char* const e = strchr(p, '}');
6862 vFAIL("Missing right brace on \\x{}");
6865 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
6866 | PERL_SCAN_DISALLOW_PREFIX;
6867 STRLEN numlen = e - p - 1;
6868 ender = grok_hex(p + 1, &numlen, &flags, NULL);
6875 I32 flags = PERL_SCAN_DISALLOW_PREFIX;
6877 ender = grok_hex(p, &numlen, &flags, NULL);
6880 if (PL_encoding && ender < 0x100)
6881 goto recode_encoding;
6885 ender = UCHARAT(p++);
6886 ender = toCTRL(ender);
6888 case '0': case '1': case '2': case '3':case '4':
6889 case '5': case '6': case '7': case '8':case '9':
6891 (isDIGIT(p[1]) && atoi(p) >= RExC_npar) ) {
6894 ender = grok_oct(p, &numlen, &flags, NULL);
6901 if (PL_encoding && ender < 0x100)
6902 goto recode_encoding;
6906 SV* enc = PL_encoding;
6907 ender = reg_recode((const char)(U8)ender, &enc);
6908 if (!enc && SIZE_ONLY && ckWARN(WARN_REGEXP))
6909 vWARN(p, "Invalid escape in the specified encoding");
6915 FAIL("Trailing \\");
6918 if (!SIZE_ONLY&& isALPHA(*p) && ckWARN(WARN_REGEXP))
6919 vWARN2(p + 1, "Unrecognized escape \\%c passed through", UCHARAT(p));
6920 goto normal_default;
6925 if (UTF8_IS_START(*p) && UTF) {
6927 ender = utf8n_to_uvchr((U8*)p, RExC_end - p,
6928 &numlen, UTF8_ALLOW_DEFAULT);
6935 if ( RExC_flags & RXf_PMf_EXTENDED)
6936 p = regwhite( pRExC_state, p );
6938 /* Prime the casefolded buffer. */
6939 ender = toFOLD_uni(ender, tmpbuf, &foldlen);
6941 if (p < RExC_end && ISMULT2(p)) { /* Back off on ?+*. */
6946 /* Emit all the Unicode characters. */
6948 for (foldbuf = tmpbuf;
6950 foldlen -= numlen) {
6951 ender = utf8_to_uvchr(foldbuf, &numlen);
6953 const STRLEN unilen = reguni(pRExC_state, ender, s);
6956 /* In EBCDIC the numlen
6957 * and unilen can differ. */
6959 if (numlen >= foldlen)
6963 break; /* "Can't happen." */
6967 const STRLEN unilen = reguni(pRExC_state, ender, s);
6976 REGC((char)ender, s++);
6982 /* Emit all the Unicode characters. */
6984 for (foldbuf = tmpbuf;
6986 foldlen -= numlen) {
6987 ender = utf8_to_uvchr(foldbuf, &numlen);
6989 const STRLEN unilen = reguni(pRExC_state, ender, s);
6992 /* In EBCDIC the numlen
6993 * and unilen can differ. */
6995 if (numlen >= foldlen)
7003 const STRLEN unilen = reguni(pRExC_state, ender, s);
7012 REGC((char)ender, s++);
7016 Set_Node_Cur_Length(ret); /* MJD */
7017 nextchar(pRExC_state);
7019 /* len is STRLEN which is unsigned, need to copy to signed */
7022 vFAIL("Internal disaster");
7026 if (len == 1 && UNI_IS_INVARIANT(ender))
7030 RExC_size += STR_SZ(len);
7033 RExC_emit += STR_SZ(len);
7043 S_regwhite( RExC_state_t *pRExC_state, char *p )
7045 const char *e = RExC_end;
7049 else if (*p == '#') {
7058 RExC_seen |= REG_SEEN_RUN_ON_COMMENT;
7066 /* Parse POSIX character classes: [[:foo:]], [[=foo=]], [[.foo.]].
7067 Character classes ([:foo:]) can also be negated ([:^foo:]).
7068 Returns a named class id (ANYOF_XXX) if successful, -1 otherwise.
7069 Equivalence classes ([=foo=]) and composites ([.foo.]) are parsed,
7070 but trigger failures because they are currently unimplemented. */
7072 #define POSIXCC_DONE(c) ((c) == ':')
7073 #define POSIXCC_NOTYET(c) ((c) == '=' || (c) == '.')
7074 #define POSIXCC(c) (POSIXCC_DONE(c) || POSIXCC_NOTYET(c))
7077 S_regpposixcc(pTHX_ RExC_state_t *pRExC_state, I32 value)
7080 I32 namedclass = OOB_NAMEDCLASS;
7082 if (value == '[' && RExC_parse + 1 < RExC_end &&
7083 /* I smell either [: or [= or [. -- POSIX has been here, right? */
7084 POSIXCC(UCHARAT(RExC_parse))) {
7085 const char c = UCHARAT(RExC_parse);
7086 char* const s = RExC_parse++;
7088 while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != c)
7090 if (RExC_parse == RExC_end)
7091 /* Grandfather lone [:, [=, [. */
7094 const char* const t = RExC_parse++; /* skip over the c */
7097 if (UCHARAT(RExC_parse) == ']') {
7098 const char *posixcc = s + 1;
7099 RExC_parse++; /* skip over the ending ] */
7102 const I32 complement = *posixcc == '^' ? *posixcc++ : 0;
7103 const I32 skip = t - posixcc;
7105 /* Initially switch on the length of the name. */
7108 if (memEQ(posixcc, "word", 4)) /* this is not POSIX, this is the Perl \w */
7109 namedclass = complement ? ANYOF_NALNUM : ANYOF_ALNUM;
7112 /* Names all of length 5. */
7113 /* alnum alpha ascii blank cntrl digit graph lower
7114 print punct space upper */
7115 /* Offset 4 gives the best switch position. */
7116 switch (posixcc[4]) {
7118 if (memEQ(posixcc, "alph", 4)) /* alpha */
7119 namedclass = complement ? ANYOF_NALPHA : ANYOF_ALPHA;
7122 if (memEQ(posixcc, "spac", 4)) /* space */
7123 namedclass = complement ? ANYOF_NPSXSPC : ANYOF_PSXSPC;
7126 if (memEQ(posixcc, "grap", 4)) /* graph */
7127 namedclass = complement ? ANYOF_NGRAPH : ANYOF_GRAPH;
7130 if (memEQ(posixcc, "asci", 4)) /* ascii */
7131 namedclass = complement ? ANYOF_NASCII : ANYOF_ASCII;
7134 if (memEQ(posixcc, "blan", 4)) /* blank */
7135 namedclass = complement ? ANYOF_NBLANK : ANYOF_BLANK;
7138 if (memEQ(posixcc, "cntr", 4)) /* cntrl */
7139 namedclass = complement ? ANYOF_NCNTRL : ANYOF_CNTRL;
7142 if (memEQ(posixcc, "alnu", 4)) /* alnum */
7143 namedclass = complement ? ANYOF_NALNUMC : ANYOF_ALNUMC;
7146 if (memEQ(posixcc, "lowe", 4)) /* lower */
7147 namedclass = complement ? ANYOF_NLOWER : ANYOF_LOWER;
7148 else if (memEQ(posixcc, "uppe", 4)) /* upper */
7149 namedclass = complement ? ANYOF_NUPPER : ANYOF_UPPER;
7152 if (memEQ(posixcc, "digi", 4)) /* digit */
7153 namedclass = complement ? ANYOF_NDIGIT : ANYOF_DIGIT;
7154 else if (memEQ(posixcc, "prin", 4)) /* print */
7155 namedclass = complement ? ANYOF_NPRINT : ANYOF_PRINT;
7156 else if (memEQ(posixcc, "punc", 4)) /* punct */
7157 namedclass = complement ? ANYOF_NPUNCT : ANYOF_PUNCT;
7162 if (memEQ(posixcc, "xdigit", 6))
7163 namedclass = complement ? ANYOF_NXDIGIT : ANYOF_XDIGIT;
7167 if (namedclass == OOB_NAMEDCLASS)
7168 Simple_vFAIL3("POSIX class [:%.*s:] unknown",
7170 assert (posixcc[skip] == ':');
7171 assert (posixcc[skip+1] == ']');
7172 } else if (!SIZE_ONLY) {
7173 /* [[=foo=]] and [[.foo.]] are still future. */
7175 /* adjust RExC_parse so the warning shows after
7177 while (UCHARAT(RExC_parse) && UCHARAT(RExC_parse) != ']')
7179 Simple_vFAIL3("POSIX syntax [%c %c] is reserved for future extensions", c, c);
7182 /* Maternal grandfather:
7183 * "[:" ending in ":" but not in ":]" */
7193 S_checkposixcc(pTHX_ RExC_state_t *pRExC_state)
7196 if (POSIXCC(UCHARAT(RExC_parse))) {
7197 const char *s = RExC_parse;
7198 const char c = *s++;
7202 if (*s && c == *s && s[1] == ']') {
7203 if (ckWARN(WARN_REGEXP))
7205 "POSIX syntax [%c %c] belongs inside character classes",
7208 /* [[=foo=]] and [[.foo.]] are still future. */
7209 if (POSIXCC_NOTYET(c)) {
7210 /* adjust RExC_parse so the error shows after
7212 while (UCHARAT(RExC_parse) && UCHARAT(RExC_parse++) != ']')
7214 Simple_vFAIL3("POSIX syntax [%c %c] is reserved for future extensions", c, c);
7221 #define _C_C_T_(NAME,TEST,WORD) \
7224 ANYOF_CLASS_SET(ret, ANYOF_##NAME); \
7226 for (value = 0; value < 256; value++) \
7228 ANYOF_BITMAP_SET(ret, value); \
7233 case ANYOF_N##NAME: \
7235 ANYOF_CLASS_SET(ret, ANYOF_N##NAME); \
7237 for (value = 0; value < 256; value++) \
7239 ANYOF_BITMAP_SET(ret, value); \
7247 parse a class specification and produce either an ANYOF node that
7248 matches the pattern or if the pattern matches a single char only and
7249 that char is < 256 and we are case insensitive then we produce an
7254 S_regclass(pTHX_ RExC_state_t *pRExC_state, U32 depth)
7257 register UV value = 0;
7258 register UV nextvalue;
7259 register IV prevvalue = OOB_UNICODE;
7260 register IV range = 0;
7261 register regnode *ret;
7264 char *rangebegin = NULL;
7265 bool need_class = 0;
7268 bool optimize_invert = TRUE;
7269 AV* unicode_alternate = NULL;
7271 UV literal_endpoint = 0;
7273 UV stored = 0; /* number of chars stored in the class */
7275 regnode * const orig_emit = RExC_emit; /* Save the original RExC_emit in
7276 case we need to change the emitted regop to an EXACT. */
7277 const char * orig_parse = RExC_parse;
7278 GET_RE_DEBUG_FLAGS_DECL;
7280 PERL_UNUSED_ARG(depth);
7283 DEBUG_PARSE("clas");
7285 /* Assume we are going to generate an ANYOF node. */
7286 ret = reganode(pRExC_state, ANYOF, 0);
7289 ANYOF_FLAGS(ret) = 0;
7291 if (UCHARAT(RExC_parse) == '^') { /* Complement of range. */
7295 ANYOF_FLAGS(ret) |= ANYOF_INVERT;
7299 RExC_size += ANYOF_SKIP;
7300 listsv = &PL_sv_undef; /* For code scanners: listsv always non-NULL. */
7303 RExC_emit += ANYOF_SKIP;
7305 ANYOF_FLAGS(ret) |= ANYOF_FOLD;
7307 ANYOF_FLAGS(ret) |= ANYOF_LOCALE;
7308 ANYOF_BITMAP_ZERO(ret);
7309 listsv = newSVpvs("# comment\n");
7312 nextvalue = RExC_parse < RExC_end ? UCHARAT(RExC_parse) : 0;
7314 if (!SIZE_ONLY && POSIXCC(nextvalue))
7315 checkposixcc(pRExC_state);
7317 /* allow 1st char to be ] (allowing it to be - is dealt with later) */
7318 if (UCHARAT(RExC_parse) == ']')
7322 while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != ']') {
7326 namedclass = OOB_NAMEDCLASS; /* initialize as illegal */
7329 rangebegin = RExC_parse;
7331 value = utf8n_to_uvchr((U8*)RExC_parse,
7332 RExC_end - RExC_parse,
7333 &numlen, UTF8_ALLOW_DEFAULT);
7334 RExC_parse += numlen;
7337 value = UCHARAT(RExC_parse++);
7339 nextvalue = RExC_parse < RExC_end ? UCHARAT(RExC_parse) : 0;
7340 if (value == '[' && POSIXCC(nextvalue))
7341 namedclass = regpposixcc(pRExC_state, value);
7342 else if (value == '\\') {
7344 value = utf8n_to_uvchr((U8*)RExC_parse,
7345 RExC_end - RExC_parse,
7346 &numlen, UTF8_ALLOW_DEFAULT);
7347 RExC_parse += numlen;
7350 value = UCHARAT(RExC_parse++);
7351 /* Some compilers cannot handle switching on 64-bit integer
7352 * values, therefore value cannot be an UV. Yes, this will
7353 * be a problem later if we want switch on Unicode.
7354 * A similar issue a little bit later when switching on
7355 * namedclass. --jhi */
7356 switch ((I32)value) {
7357 case 'w': namedclass = ANYOF_ALNUM; break;
7358 case 'W': namedclass = ANYOF_NALNUM; break;
7359 case 's': namedclass = ANYOF_SPACE; break;
7360 case 'S': namedclass = ANYOF_NSPACE; break;
7361 case 'd': namedclass = ANYOF_DIGIT; break;
7362 case 'D': namedclass = ANYOF_NDIGIT; break;
7363 case 'N': /* Handle \N{NAME} in class */
7365 /* We only pay attention to the first char of
7366 multichar strings being returned. I kinda wonder
7367 if this makes sense as it does change the behaviour
7368 from earlier versions, OTOH that behaviour was broken
7370 UV v; /* value is register so we cant & it /grrr */
7371 if (reg_namedseq(pRExC_state, &v)) {
7381 if (RExC_parse >= RExC_end)
7382 vFAIL2("Empty \\%c{}", (U8)value);
7383 if (*RExC_parse == '{') {
7384 const U8 c = (U8)value;
7385 e = strchr(RExC_parse++, '}');
7387 vFAIL2("Missing right brace on \\%c{}", c);
7388 while (isSPACE(UCHARAT(RExC_parse)))
7390 if (e == RExC_parse)
7391 vFAIL2("Empty \\%c{}", c);
7393 while (isSPACE(UCHARAT(RExC_parse + n - 1)))
7401 if (UCHARAT(RExC_parse) == '^') {
7404 value = value == 'p' ? 'P' : 'p'; /* toggle */
7405 while (isSPACE(UCHARAT(RExC_parse))) {
7410 Perl_sv_catpvf(aTHX_ listsv, "%cutf8::%.*s\n",
7411 (value=='p' ? '+' : '!'), (int)n, RExC_parse);
7414 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
7415 namedclass = ANYOF_MAX; /* no official name, but it's named */
7418 case 'n': value = '\n'; break;
7419 case 'r': value = '\r'; break;
7420 case 't': value = '\t'; break;
7421 case 'f': value = '\f'; break;
7422 case 'b': value = '\b'; break;
7423 case 'e': value = ASCII_TO_NATIVE('\033');break;
7424 case 'a': value = ASCII_TO_NATIVE('\007');break;
7426 if (*RExC_parse == '{') {
7427 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
7428 | PERL_SCAN_DISALLOW_PREFIX;
7429 char * const e = strchr(RExC_parse++, '}');
7431 vFAIL("Missing right brace on \\x{}");
7433 numlen = e - RExC_parse;
7434 value = grok_hex(RExC_parse, &numlen, &flags, NULL);
7438 I32 flags = PERL_SCAN_DISALLOW_PREFIX;
7440 value = grok_hex(RExC_parse, &numlen, &flags, NULL);
7441 RExC_parse += numlen;
7443 if (PL_encoding && value < 0x100)
7444 goto recode_encoding;
7447 value = UCHARAT(RExC_parse++);
7448 value = toCTRL(value);
7450 case '0': case '1': case '2': case '3': case '4':
7451 case '5': case '6': case '7': case '8': case '9':
7455 value = grok_oct(--RExC_parse, &numlen, &flags, NULL);
7456 RExC_parse += numlen;
7457 if (PL_encoding && value < 0x100)
7458 goto recode_encoding;
7463 SV* enc = PL_encoding;
7464 value = reg_recode((const char)(U8)value, &enc);
7465 if (!enc && SIZE_ONLY && ckWARN(WARN_REGEXP))
7467 "Invalid escape in the specified encoding");
7471 if (!SIZE_ONLY && isALPHA(value) && ckWARN(WARN_REGEXP))
7473 "Unrecognized escape \\%c in character class passed through",
7477 } /* end of \blah */
7483 if (namedclass > OOB_NAMEDCLASS) { /* this is a named class \blah */
7485 if (!SIZE_ONLY && !need_class)
7486 ANYOF_CLASS_ZERO(ret);
7490 /* a bad range like a-\d, a-[:digit:] ? */
7493 if (ckWARN(WARN_REGEXP)) {
7495 RExC_parse >= rangebegin ?
7496 RExC_parse - rangebegin : 0;
7498 "False [] range \"%*.*s\"",
7501 if (prevvalue < 256) {
7502 ANYOF_BITMAP_SET(ret, prevvalue);
7503 ANYOF_BITMAP_SET(ret, '-');
7506 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
7507 Perl_sv_catpvf(aTHX_ listsv,
7508 "%04"UVxf"\n%04"UVxf"\n", (UV)prevvalue, (UV) '-');
7512 range = 0; /* this was not a true range */
7518 const char *what = NULL;
7521 if (namedclass > OOB_NAMEDCLASS)
7522 optimize_invert = FALSE;
7523 /* Possible truncation here but in some 64-bit environments
7524 * the compiler gets heartburn about switch on 64-bit values.
7525 * A similar issue a little earlier when switching on value.
7527 switch ((I32)namedclass) {
7528 case _C_C_T_(ALNUM, isALNUM(value), "Word");
7529 case _C_C_T_(ALNUMC, isALNUMC(value), "Alnum");
7530 case _C_C_T_(ALPHA, isALPHA(value), "Alpha");
7531 case _C_C_T_(BLANK, isBLANK(value), "Blank");
7532 case _C_C_T_(CNTRL, isCNTRL(value), "Cntrl");
7533 case _C_C_T_(GRAPH, isGRAPH(value), "Graph");
7534 case _C_C_T_(LOWER, isLOWER(value), "Lower");
7535 case _C_C_T_(PRINT, isPRINT(value), "Print");
7536 case _C_C_T_(PSXSPC, isPSXSPC(value), "Space");
7537 case _C_C_T_(PUNCT, isPUNCT(value), "Punct");
7538 case _C_C_T_(SPACE, isSPACE(value), "SpacePerl");
7539 case _C_C_T_(UPPER, isUPPER(value), "Upper");
7540 case _C_C_T_(XDIGIT, isXDIGIT(value), "XDigit");
7543 ANYOF_CLASS_SET(ret, ANYOF_ASCII);
7546 for (value = 0; value < 128; value++)
7547 ANYOF_BITMAP_SET(ret, value);
7549 for (value = 0; value < 256; value++) {
7551 ANYOF_BITMAP_SET(ret, value);
7560 ANYOF_CLASS_SET(ret, ANYOF_NASCII);
7563 for (value = 128; value < 256; value++)
7564 ANYOF_BITMAP_SET(ret, value);
7566 for (value = 0; value < 256; value++) {
7567 if (!isASCII(value))
7568 ANYOF_BITMAP_SET(ret, value);
7577 ANYOF_CLASS_SET(ret, ANYOF_DIGIT);
7579 /* consecutive digits assumed */
7580 for (value = '0'; value <= '9'; value++)
7581 ANYOF_BITMAP_SET(ret, value);
7588 ANYOF_CLASS_SET(ret, ANYOF_NDIGIT);
7590 /* consecutive digits assumed */
7591 for (value = 0; value < '0'; value++)
7592 ANYOF_BITMAP_SET(ret, value);
7593 for (value = '9' + 1; value < 256; value++)
7594 ANYOF_BITMAP_SET(ret, value);
7600 /* this is to handle \p and \P */
7603 vFAIL("Invalid [::] class");
7607 /* Strings such as "+utf8::isWord\n" */
7608 Perl_sv_catpvf(aTHX_ listsv, "%cutf8::Is%s\n", yesno, what);
7611 ANYOF_FLAGS(ret) |= ANYOF_CLASS;
7614 } /* end of namedclass \blah */
7617 if (prevvalue > (IV)value) /* b-a */ {
7618 const int w = RExC_parse - rangebegin;
7619 Simple_vFAIL4("Invalid [] range \"%*.*s\"", w, w, rangebegin);
7620 range = 0; /* not a valid range */
7624 prevvalue = value; /* save the beginning of the range */
7625 if (*RExC_parse == '-' && RExC_parse+1 < RExC_end &&
7626 RExC_parse[1] != ']') {
7629 /* a bad range like \w-, [:word:]- ? */
7630 if (namedclass > OOB_NAMEDCLASS) {
7631 if (ckWARN(WARN_REGEXP)) {
7633 RExC_parse >= rangebegin ?
7634 RExC_parse - rangebegin : 0;
7636 "False [] range \"%*.*s\"",
7640 ANYOF_BITMAP_SET(ret, '-');
7642 range = 1; /* yeah, it's a range! */
7643 continue; /* but do it the next time */
7647 /* now is the next time */
7648 /*stored += (value - prevvalue + 1);*/
7650 if (prevvalue < 256) {
7651 const IV ceilvalue = value < 256 ? value : 255;
7654 /* In EBCDIC [\x89-\x91] should include
7655 * the \x8e but [i-j] should not. */
7656 if (literal_endpoint == 2 &&
7657 ((isLOWER(prevvalue) && isLOWER(ceilvalue)) ||
7658 (isUPPER(prevvalue) && isUPPER(ceilvalue))))
7660 if (isLOWER(prevvalue)) {
7661 for (i = prevvalue; i <= ceilvalue; i++)
7663 ANYOF_BITMAP_SET(ret, i);
7665 for (i = prevvalue; i <= ceilvalue; i++)
7667 ANYOF_BITMAP_SET(ret, i);
7672 for (i = prevvalue; i <= ceilvalue; i++) {
7673 if (!ANYOF_BITMAP_TEST(ret,i)) {
7675 ANYOF_BITMAP_SET(ret, i);
7679 if (value > 255 || UTF) {
7680 const UV prevnatvalue = NATIVE_TO_UNI(prevvalue);
7681 const UV natvalue = NATIVE_TO_UNI(value);
7682 stored+=2; /* can't optimize this class */
7683 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
7684 if (prevnatvalue < natvalue) { /* what about > ? */
7685 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\t%04"UVxf"\n",
7686 prevnatvalue, natvalue);
7688 else if (prevnatvalue == natvalue) {
7689 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n", natvalue);
7691 U8 foldbuf[UTF8_MAXBYTES_CASE+1];
7693 const UV f = to_uni_fold(natvalue, foldbuf, &foldlen);
7695 #ifdef EBCDIC /* RD t/uni/fold ff and 6b */
7696 if (RExC_precomp[0] == ':' &&
7697 RExC_precomp[1] == '[' &&
7698 (f == 0xDF || f == 0x92)) {
7699 f = NATIVE_TO_UNI(f);
7702 /* If folding and foldable and a single
7703 * character, insert also the folded version
7704 * to the charclass. */
7706 #ifdef EBCDIC /* RD tunifold ligatures s,t fb05, fb06 */
7707 if ((RExC_precomp[0] == ':' &&
7708 RExC_precomp[1] == '[' &&
7710 (value == 0xFB05 || value == 0xFB06))) ?
7711 foldlen == ((STRLEN)UNISKIP(f) - 1) :
7712 foldlen == (STRLEN)UNISKIP(f) )
7714 if (foldlen == (STRLEN)UNISKIP(f))
7716 Perl_sv_catpvf(aTHX_ listsv,
7719 /* Any multicharacter foldings
7720 * require the following transform:
7721 * [ABCDEF] -> (?:[ABCabcDEFd]|pq|rst)
7722 * where E folds into "pq" and F folds
7723 * into "rst", all other characters
7724 * fold to single characters. We save
7725 * away these multicharacter foldings,
7726 * to be later saved as part of the
7727 * additional "s" data. */
7730 if (!unicode_alternate)
7731 unicode_alternate = newAV();
7732 sv = newSVpvn((char*)foldbuf, foldlen);
7734 av_push(unicode_alternate, sv);
7738 /* If folding and the value is one of the Greek
7739 * sigmas insert a few more sigmas to make the
7740 * folding rules of the sigmas to work right.
7741 * Note that not all the possible combinations
7742 * are handled here: some of them are handled
7743 * by the standard folding rules, and some of
7744 * them (literal or EXACTF cases) are handled
7745 * during runtime in regexec.c:S_find_byclass(). */
7746 if (value == UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA) {
7747 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
7748 (UV)UNICODE_GREEK_CAPITAL_LETTER_SIGMA);
7749 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
7750 (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA);
7752 else if (value == UNICODE_GREEK_CAPITAL_LETTER_SIGMA)
7753 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
7754 (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA);
7759 literal_endpoint = 0;
7763 range = 0; /* this range (if it was one) is done now */
7767 ANYOF_FLAGS(ret) |= ANYOF_LARGE;
7769 RExC_size += ANYOF_CLASS_ADD_SKIP;
7771 RExC_emit += ANYOF_CLASS_ADD_SKIP;
7777 /****** !SIZE_ONLY AFTER HERE *********/
7779 if( stored == 1 && (value < 128 || (value < 256 && !UTF))
7780 && !( ANYOF_FLAGS(ret) & ( ANYOF_FLAGS_ALL ^ ANYOF_FOLD ) )
7782 /* optimize single char class to an EXACT node
7783 but *only* when its not a UTF/high char */
7784 const char * cur_parse= RExC_parse;
7785 RExC_emit = (regnode *)orig_emit;
7786 RExC_parse = (char *)orig_parse;
7787 ret = reg_node(pRExC_state,
7788 (U8)((ANYOF_FLAGS(ret) & ANYOF_FOLD) ? EXACTF : EXACT));
7789 RExC_parse = (char *)cur_parse;
7790 *STRING(ret)= (char)value;
7792 RExC_emit += STR_SZ(1);
7795 /* optimize case-insensitive simple patterns (e.g. /[a-z]/i) */
7796 if ( /* If the only flag is folding (plus possibly inversion). */
7797 ((ANYOF_FLAGS(ret) & (ANYOF_FLAGS_ALL ^ ANYOF_INVERT)) == ANYOF_FOLD)
7799 for (value = 0; value < 256; ++value) {
7800 if (ANYOF_BITMAP_TEST(ret, value)) {
7801 UV fold = PL_fold[value];
7804 ANYOF_BITMAP_SET(ret, fold);
7807 ANYOF_FLAGS(ret) &= ~ANYOF_FOLD;
7810 /* optimize inverted simple patterns (e.g. [^a-z]) */
7811 if (optimize_invert &&
7812 /* If the only flag is inversion. */
7813 (ANYOF_FLAGS(ret) & ANYOF_FLAGS_ALL) == ANYOF_INVERT) {
7814 for (value = 0; value < ANYOF_BITMAP_SIZE; ++value)
7815 ANYOF_BITMAP(ret)[value] ^= ANYOF_FLAGS_ALL;
7816 ANYOF_FLAGS(ret) = ANYOF_UNICODE_ALL;
7819 AV * const av = newAV();
7821 /* The 0th element stores the character class description
7822 * in its textual form: used later (regexec.c:Perl_regclass_swash())
7823 * to initialize the appropriate swash (which gets stored in
7824 * the 1st element), and also useful for dumping the regnode.
7825 * The 2nd element stores the multicharacter foldings,
7826 * used later (regexec.c:S_reginclass()). */
7827 av_store(av, 0, listsv);
7828 av_store(av, 1, NULL);
7829 av_store(av, 2, (SV*)unicode_alternate);
7830 rv = newRV_noinc((SV*)av);
7831 n = add_data(pRExC_state, 1, "s");
7832 RExC_rxi->data->data[n] = (void*)rv;
7840 /* reg_skipcomment()
7842 Absorbs an /x style # comments from the input stream.
7843 Returns true if there is more text remaining in the stream.
7844 Will set the REG_SEEN_RUN_ON_COMMENT flag if the comment
7845 terminates the pattern without including a newline.
7847 Note its the callers responsibility to ensure that we are
7853 S_reg_skipcomment(pTHX_ RExC_state_t *pRExC_state)
7856 while (RExC_parse < RExC_end)
7857 if (*RExC_parse++ == '\n') {
7862 /* we ran off the end of the pattern without ending
7863 the comment, so we have to add an \n when wrapping */
7864 RExC_seen |= REG_SEEN_RUN_ON_COMMENT;
7872 Advance that parse position, and optionall absorbs
7873 "whitespace" from the inputstream.
7875 Without /x "whitespace" means (?#...) style comments only,
7876 with /x this means (?#...) and # comments and whitespace proper.
7878 Returns the RExC_parse point from BEFORE the scan occurs.
7880 This is the /x friendly way of saying RExC_parse++.
7884 S_nextchar(pTHX_ RExC_state_t *pRExC_state)
7886 char* const retval = RExC_parse++;
7889 if (*RExC_parse == '(' && RExC_parse[1] == '?' &&
7890 RExC_parse[2] == '#') {
7891 while (*RExC_parse != ')') {
7892 if (RExC_parse == RExC_end)
7893 FAIL("Sequence (?#... not terminated");
7899 if (RExC_flags & RXf_PMf_EXTENDED) {
7900 if (isSPACE(*RExC_parse)) {
7904 else if (*RExC_parse == '#') {
7905 if ( reg_skipcomment( pRExC_state ) )
7914 - reg_node - emit a node
7916 STATIC regnode * /* Location. */
7917 S_reg_node(pTHX_ RExC_state_t *pRExC_state, U8 op)
7920 register regnode *ptr;
7921 regnode * const ret = RExC_emit;
7922 GET_RE_DEBUG_FLAGS_DECL;
7925 SIZE_ALIGN(RExC_size);
7929 if (RExC_emit >= RExC_emit_bound)
7930 Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %d", op);
7932 NODE_ALIGN_FILL(ret);
7934 FILL_ADVANCE_NODE(ptr, op);
7935 #ifdef RE_TRACK_PATTERN_OFFSETS
7936 if (RExC_offsets) { /* MJD */
7937 MJD_OFFSET_DEBUG(("%s:%d: (op %s) %s %"UVuf" (len %"UVuf") (max %"UVuf").\n",
7938 "reg_node", __LINE__,
7940 (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0]
7941 ? "Overwriting end of array!\n" : "OK",
7942 (UV)(RExC_emit - RExC_emit_start),
7943 (UV)(RExC_parse - RExC_start),
7944 (UV)RExC_offsets[0]));
7945 Set_Node_Offset(RExC_emit, RExC_parse + (op == END));
7953 - reganode - emit a node with an argument
7955 STATIC regnode * /* Location. */
7956 S_reganode(pTHX_ RExC_state_t *pRExC_state, U8 op, U32 arg)
7959 register regnode *ptr;
7960 regnode * const ret = RExC_emit;
7961 GET_RE_DEBUG_FLAGS_DECL;
7964 SIZE_ALIGN(RExC_size);
7969 assert(2==regarglen[op]+1);
7971 Anything larger than this has to allocate the extra amount.
7972 If we changed this to be:
7974 RExC_size += (1 + regarglen[op]);
7976 then it wouldn't matter. Its not clear what side effect
7977 might come from that so its not done so far.
7982 if (RExC_emit >= RExC_emit_bound)
7983 Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %d", op);
7985 NODE_ALIGN_FILL(ret);
7987 FILL_ADVANCE_NODE_ARG(ptr, op, arg);
7988 #ifdef RE_TRACK_PATTERN_OFFSETS
7989 if (RExC_offsets) { /* MJD */
7990 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
7994 (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0] ?
7995 "Overwriting end of array!\n" : "OK",
7996 (UV)(RExC_emit - RExC_emit_start),
7997 (UV)(RExC_parse - RExC_start),
7998 (UV)RExC_offsets[0]));
7999 Set_Cur_Node_Offset;
8007 - reguni - emit (if appropriate) a Unicode character
8010 S_reguni(pTHX_ const RExC_state_t *pRExC_state, UV uv, char* s)
8013 return SIZE_ONLY ? UNISKIP(uv) : (uvchr_to_utf8((U8*)s, uv) - (U8*)s);
8017 - reginsert - insert an operator in front of already-emitted operand
8019 * Means relocating the operand.
8022 S_reginsert(pTHX_ RExC_state_t *pRExC_state, U8 op, regnode *opnd, U32 depth)
8025 register regnode *src;
8026 register regnode *dst;
8027 register regnode *place;
8028 const int offset = regarglen[(U8)op];
8029 const int size = NODE_STEP_REGNODE + offset;
8030 GET_RE_DEBUG_FLAGS_DECL;
8031 PERL_UNUSED_ARG(depth);
8032 /* (PL_regkind[(U8)op] == CURLY ? EXTRA_STEP_2ARGS : 0); */
8033 DEBUG_PARSE_FMT("inst"," - %s",PL_reg_name[op]);
8042 if (RExC_open_parens) {
8044 /*DEBUG_PARSE_FMT("inst"," - %"IVdf, (IV)RExC_npar);*/
8045 for ( paren=0 ; paren < RExC_npar ; paren++ ) {
8046 if ( RExC_open_parens[paren] >= opnd ) {
8047 /*DEBUG_PARSE_FMT("open"," - %d",size);*/
8048 RExC_open_parens[paren] += size;
8050 /*DEBUG_PARSE_FMT("open"," - %s","ok");*/
8052 if ( RExC_close_parens[paren] >= opnd ) {
8053 /*DEBUG_PARSE_FMT("close"," - %d",size);*/
8054 RExC_close_parens[paren] += size;
8056 /*DEBUG_PARSE_FMT("close"," - %s","ok");*/
8061 while (src > opnd) {
8062 StructCopy(--src, --dst, regnode);
8063 #ifdef RE_TRACK_PATTERN_OFFSETS
8064 if (RExC_offsets) { /* MJD 20010112 */
8065 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s copy %"UVuf" -> %"UVuf" (max %"UVuf").\n",
8069 (UV)(dst - RExC_emit_start) > RExC_offsets[0]
8070 ? "Overwriting end of array!\n" : "OK",
8071 (UV)(src - RExC_emit_start),
8072 (UV)(dst - RExC_emit_start),
8073 (UV)RExC_offsets[0]));
8074 Set_Node_Offset_To_R(dst-RExC_emit_start, Node_Offset(src));
8075 Set_Node_Length_To_R(dst-RExC_emit_start, Node_Length(src));
8081 place = opnd; /* Op node, where operand used to be. */
8082 #ifdef RE_TRACK_PATTERN_OFFSETS
8083 if (RExC_offsets) { /* MJD */
8084 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
8088 (UV)(place - RExC_emit_start) > RExC_offsets[0]
8089 ? "Overwriting end of array!\n" : "OK",
8090 (UV)(place - RExC_emit_start),
8091 (UV)(RExC_parse - RExC_start),
8092 (UV)RExC_offsets[0]));
8093 Set_Node_Offset(place, RExC_parse);
8094 Set_Node_Length(place, 1);
8097 src = NEXTOPER(place);
8098 FILL_ADVANCE_NODE(place, op);
8099 Zero(src, offset, regnode);
8103 - regtail - set the next-pointer at the end of a node chain of p to val.
8104 - SEE ALSO: regtail_study
8106 /* TODO: All three parms should be const */
8108 S_regtail(pTHX_ RExC_state_t *pRExC_state, regnode *p, const regnode *val,U32 depth)
8111 register regnode *scan;
8112 GET_RE_DEBUG_FLAGS_DECL;
8114 PERL_UNUSED_ARG(depth);
8120 /* Find last node. */
8123 regnode * const temp = regnext(scan);
8125 SV * const mysv=sv_newmortal();
8126 DEBUG_PARSE_MSG((scan==p ? "tail" : ""));
8127 regprop(RExC_rx, mysv, scan);
8128 PerlIO_printf(Perl_debug_log, "~ %s (%d) %s %s\n",
8129 SvPV_nolen_const(mysv), REG_NODE_NUM(scan),
8130 (temp == NULL ? "->" : ""),
8131 (temp == NULL ? PL_reg_name[OP(val)] : "")
8139 if (reg_off_by_arg[OP(scan)]) {
8140 ARG_SET(scan, val - scan);
8143 NEXT_OFF(scan) = val - scan;
8149 - regtail_study - set the next-pointer at the end of a node chain of p to val.
8150 - Look for optimizable sequences at the same time.
8151 - currently only looks for EXACT chains.
8153 This is expermental code. The idea is to use this routine to perform
8154 in place optimizations on branches and groups as they are constructed,
8155 with the long term intention of removing optimization from study_chunk so
8156 that it is purely analytical.
8158 Currently only used when in DEBUG mode. The macro REGTAIL_STUDY() is used
8159 to control which is which.
8162 /* TODO: All four parms should be const */
8165 S_regtail_study(pTHX_ RExC_state_t *pRExC_state, regnode *p, const regnode *val,U32 depth)
8168 register regnode *scan;
8170 #ifdef EXPERIMENTAL_INPLACESCAN
8174 GET_RE_DEBUG_FLAGS_DECL;
8180 /* Find last node. */
8184 regnode * const temp = regnext(scan);
8185 #ifdef EXPERIMENTAL_INPLACESCAN
8186 if (PL_regkind[OP(scan)] == EXACT)
8187 if (join_exact(pRExC_state,scan,&min,1,val,depth+1))
8195 if( exact == PSEUDO )
8197 else if ( exact != OP(scan) )
8206 SV * const mysv=sv_newmortal();
8207 DEBUG_PARSE_MSG((scan==p ? "tsdy" : ""));
8208 regprop(RExC_rx, mysv, scan);
8209 PerlIO_printf(Perl_debug_log, "~ %s (%d) -> %s\n",
8210 SvPV_nolen_const(mysv),
8212 PL_reg_name[exact]);
8219 SV * const mysv_val=sv_newmortal();
8220 DEBUG_PARSE_MSG("");
8221 regprop(RExC_rx, mysv_val, val);
8222 PerlIO_printf(Perl_debug_log, "~ attach to %s (%"IVdf") offset to %"IVdf"\n",
8223 SvPV_nolen_const(mysv_val),
8224 (IV)REG_NODE_NUM(val),
8228 if (reg_off_by_arg[OP(scan)]) {
8229 ARG_SET(scan, val - scan);
8232 NEXT_OFF(scan) = val - scan;
8240 - regcurly - a little FSA that accepts {\d+,?\d*}
8243 S_regcurly(register const char *s)
8262 - regdump - dump a regexp onto Perl_debug_log in vaguely comprehensible form
8265 Perl_regdump(pTHX_ const regexp *r)
8269 SV * const sv = sv_newmortal();
8270 SV *dsv= sv_newmortal();
8273 (void)dumpuntil(r, ri->program, ri->program + 1, NULL, NULL, sv, 0, 0);
8275 /* Header fields of interest. */
8276 if (r->anchored_substr) {
8277 RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->anchored_substr),
8278 RE_SV_DUMPLEN(r->anchored_substr), 30);
8279 PerlIO_printf(Perl_debug_log,
8280 "anchored %s%s at %"IVdf" ",
8281 s, RE_SV_TAIL(r->anchored_substr),
8282 (IV)r->anchored_offset);
8283 } else if (r->anchored_utf8) {
8284 RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->anchored_utf8),
8285 RE_SV_DUMPLEN(r->anchored_utf8), 30);
8286 PerlIO_printf(Perl_debug_log,
8287 "anchored utf8 %s%s at %"IVdf" ",
8288 s, RE_SV_TAIL(r->anchored_utf8),
8289 (IV)r->anchored_offset);
8291 if (r->float_substr) {
8292 RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->float_substr),
8293 RE_SV_DUMPLEN(r->float_substr), 30);
8294 PerlIO_printf(Perl_debug_log,
8295 "floating %s%s at %"IVdf"..%"UVuf" ",
8296 s, RE_SV_TAIL(r->float_substr),
8297 (IV)r->float_min_offset, (UV)r->float_max_offset);
8298 } else if (r->float_utf8) {
8299 RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->float_utf8),
8300 RE_SV_DUMPLEN(r->float_utf8), 30);
8301 PerlIO_printf(Perl_debug_log,
8302 "floating utf8 %s%s at %"IVdf"..%"UVuf" ",
8303 s, RE_SV_TAIL(r->float_utf8),
8304 (IV)r->float_min_offset, (UV)r->float_max_offset);
8306 if (r->check_substr || r->check_utf8)
8307 PerlIO_printf(Perl_debug_log,
8309 (r->check_substr == r->float_substr
8310 && r->check_utf8 == r->float_utf8
8311 ? "(checking floating" : "(checking anchored"));
8312 if (r->extflags & RXf_NOSCAN)
8313 PerlIO_printf(Perl_debug_log, " noscan");
8314 if (r->extflags & RXf_CHECK_ALL)
8315 PerlIO_printf(Perl_debug_log, " isall");
8316 if (r->check_substr || r->check_utf8)
8317 PerlIO_printf(Perl_debug_log, ") ");
8319 if (ri->regstclass) {
8320 regprop(r, sv, ri->regstclass);
8321 PerlIO_printf(Perl_debug_log, "stclass %s ", SvPVX_const(sv));
8323 if (r->extflags & RXf_ANCH) {
8324 PerlIO_printf(Perl_debug_log, "anchored");
8325 if (r->extflags & RXf_ANCH_BOL)
8326 PerlIO_printf(Perl_debug_log, "(BOL)");
8327 if (r->extflags & RXf_ANCH_MBOL)
8328 PerlIO_printf(Perl_debug_log, "(MBOL)");
8329 if (r->extflags & RXf_ANCH_SBOL)
8330 PerlIO_printf(Perl_debug_log, "(SBOL)");
8331 if (r->extflags & RXf_ANCH_GPOS)
8332 PerlIO_printf(Perl_debug_log, "(GPOS)");
8333 PerlIO_putc(Perl_debug_log, ' ');
8335 if (r->extflags & RXf_GPOS_SEEN)
8336 PerlIO_printf(Perl_debug_log, "GPOS:%"UVuf" ", (UV)r->gofs);
8337 if (r->intflags & PREGf_SKIP)
8338 PerlIO_printf(Perl_debug_log, "plus ");
8339 if (r->intflags & PREGf_IMPLICIT)
8340 PerlIO_printf(Perl_debug_log, "implicit ");
8341 PerlIO_printf(Perl_debug_log, "minlen %"IVdf" ", (IV)r->minlen);
8342 if (r->extflags & RXf_EVAL_SEEN)
8343 PerlIO_printf(Perl_debug_log, "with eval ");
8344 PerlIO_printf(Perl_debug_log, "\n");
8346 PERL_UNUSED_CONTEXT;
8348 #endif /* DEBUGGING */
8352 - regprop - printable representation of opcode
8355 Perl_regprop(pTHX_ const regexp *prog, SV *sv, const regnode *o)
8360 RXi_GET_DECL(prog,progi);
8361 GET_RE_DEBUG_FLAGS_DECL;
8364 sv_setpvn(sv, "", 0);
8366 if (OP(o) > REGNODE_MAX) /* regnode.type is unsigned */
8367 /* It would be nice to FAIL() here, but this may be called from
8368 regexec.c, and it would be hard to supply pRExC_state. */
8369 Perl_croak(aTHX_ "Corrupted regexp opcode %d > %d", (int)OP(o), (int)REGNODE_MAX);
8370 sv_catpv(sv, PL_reg_name[OP(o)]); /* Take off const! */
8372 k = PL_regkind[OP(o)];
8375 SV * const dsv = sv_2mortal(newSVpvs(""));
8376 /* Using is_utf8_string() (via PERL_PV_UNI_DETECT)
8377 * is a crude hack but it may be the best for now since
8378 * we have no flag "this EXACTish node was UTF-8"
8380 const char * const s =
8381 pv_pretty(dsv, STRING(o), STR_LEN(o), 60,
8382 PL_colors[0], PL_colors[1],
8383 PERL_PV_ESCAPE_UNI_DETECT |
8384 PERL_PV_PRETTY_ELIPSES |
8387 Perl_sv_catpvf(aTHX_ sv, " %s", s );
8388 } else if (k == TRIE) {
8389 /* print the details of the trie in dumpuntil instead, as
8390 * progi->data isn't available here */
8391 const char op = OP(o);
8392 const U32 n = ARG(o);
8393 const reg_ac_data * const ac = IS_TRIE_AC(op) ?
8394 (reg_ac_data *)progi->data->data[n] :
8396 const reg_trie_data * const trie
8397 = (reg_trie_data*)progi->data->data[!IS_TRIE_AC(op) ? n : ac->trie];
8399 Perl_sv_catpvf(aTHX_ sv, "-%s",PL_reg_name[o->flags]);
8400 DEBUG_TRIE_COMPILE_r(
8401 Perl_sv_catpvf(aTHX_ sv,
8402 "<S:%"UVuf"/%"IVdf" W:%"UVuf" L:%"UVuf"/%"UVuf" C:%"UVuf"/%"UVuf">",
8403 (UV)trie->startstate,
8404 (IV)trie->statecount-1, /* -1 because of the unused 0 element */
8405 (UV)trie->wordcount,
8408 (UV)TRIE_CHARCOUNT(trie),
8409 (UV)trie->uniquecharcount
8412 if ( IS_ANYOF_TRIE(op) || trie->bitmap ) {
8414 int rangestart = -1;
8415 U8* bitmap = IS_ANYOF_TRIE(op) ? (U8*)ANYOF_BITMAP(o) : (U8*)TRIE_BITMAP(trie);
8416 Perl_sv_catpvf(aTHX_ sv, "[");
8417 for (i = 0; i <= 256; i++) {
8418 if (i < 256 && BITMAP_TEST(bitmap,i)) {
8419 if (rangestart == -1)
8421 } else if (rangestart != -1) {
8422 if (i <= rangestart + 3)
8423 for (; rangestart < i; rangestart++)
8424 put_byte(sv, rangestart);
8426 put_byte(sv, rangestart);
8428 put_byte(sv, i - 1);
8433 Perl_sv_catpvf(aTHX_ sv, "]");
8436 } else if (k == CURLY) {
8437 if (OP(o) == CURLYM || OP(o) == CURLYN || OP(o) == CURLYX)
8438 Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* Parenth number */
8439 Perl_sv_catpvf(aTHX_ sv, " {%d,%d}", ARG1(o), ARG2(o));
8441 else if (k == WHILEM && o->flags) /* Ordinal/of */
8442 Perl_sv_catpvf(aTHX_ sv, "[%d/%d]", o->flags & 0xf, o->flags>>4);
8443 else if (k == REF || k == OPEN || k == CLOSE || k == GROUPP || OP(o)==ACCEPT) {
8444 Perl_sv_catpvf(aTHX_ sv, "%d", (int)ARG(o)); /* Parenth number */
8445 if ( prog->paren_names ) {
8446 if ( k != REF || OP(o) < NREF) {
8447 AV *list= (AV *)progi->data->data[progi->name_list_idx];
8448 SV **name= av_fetch(list, ARG(o), 0 );
8450 Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
8453 AV *list= (AV *)progi->data->data[ progi->name_list_idx ];
8454 SV *sv_dat=(SV*)progi->data->data[ ARG( o ) ];
8455 I32 *nums=(I32*)SvPVX(sv_dat);
8456 SV **name= av_fetch(list, nums[0], 0 );
8459 for ( n=0; n<SvIVX(sv_dat); n++ ) {
8460 Perl_sv_catpvf(aTHX_ sv, "%s%"IVdf,
8461 (n ? "," : ""), (IV)nums[n]);
8463 Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
8467 } else if (k == GOSUB)
8468 Perl_sv_catpvf(aTHX_ sv, "%d[%+d]", (int)ARG(o),(int)ARG2L(o)); /* Paren and offset */
8469 else if (k == VERB) {
8471 Perl_sv_catpvf(aTHX_ sv, ":%"SVf,
8472 SVfARG((SV*)progi->data->data[ ARG( o ) ]));
8473 } else if (k == LOGICAL)
8474 Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* 2: embedded, otherwise 1 */
8475 else if (k == ANYOF) {
8476 int i, rangestart = -1;
8477 const U8 flags = ANYOF_FLAGS(o);
8479 /* Should be synchronized with * ANYOF_ #xdefines in regcomp.h */
8480 static const char * const anyofs[] = {
8513 if (flags & ANYOF_LOCALE)
8514 sv_catpvs(sv, "{loc}");
8515 if (flags & ANYOF_FOLD)
8516 sv_catpvs(sv, "{i}");
8517 Perl_sv_catpvf(aTHX_ sv, "[%s", PL_colors[0]);
8518 if (flags & ANYOF_INVERT)
8520 for (i = 0; i <= 256; i++) {
8521 if (i < 256 && ANYOF_BITMAP_TEST(o,i)) {
8522 if (rangestart == -1)
8524 } else if (rangestart != -1) {
8525 if (i <= rangestart + 3)
8526 for (; rangestart < i; rangestart++)
8527 put_byte(sv, rangestart);
8529 put_byte(sv, rangestart);
8531 put_byte(sv, i - 1);
8537 if (o->flags & ANYOF_CLASS)
8538 for (i = 0; i < (int)(sizeof(anyofs)/sizeof(char*)); i++)
8539 if (ANYOF_CLASS_TEST(o,i))
8540 sv_catpv(sv, anyofs[i]);
8542 if (flags & ANYOF_UNICODE)
8543 sv_catpvs(sv, "{unicode}");
8544 else if (flags & ANYOF_UNICODE_ALL)
8545 sv_catpvs(sv, "{unicode_all}");
8549 SV * const sw = regclass_swash(prog, o, FALSE, &lv, 0);
8553 U8 s[UTF8_MAXBYTES_CASE+1];
8555 for (i = 0; i <= 256; i++) { /* just the first 256 */
8556 uvchr_to_utf8(s, i);
8558 if (i < 256 && swash_fetch(sw, s, TRUE)) {
8559 if (rangestart == -1)
8561 } else if (rangestart != -1) {
8562 if (i <= rangestart + 3)
8563 for (; rangestart < i; rangestart++) {
8564 const U8 * const e = uvchr_to_utf8(s,rangestart);
8566 for(p = s; p < e; p++)
8570 const U8 *e = uvchr_to_utf8(s,rangestart);
8572 for (p = s; p < e; p++)
8575 e = uvchr_to_utf8(s, i-1);
8576 for (p = s; p < e; p++)
8583 sv_catpvs(sv, "..."); /* et cetera */
8587 char *s = savesvpv(lv);
8588 char * const origs = s;
8590 while (*s && *s != '\n')
8594 const char * const t = ++s;
8612 Perl_sv_catpvf(aTHX_ sv, "%s]", PL_colors[1]);
8614 else if (k == BRANCHJ && (OP(o) == UNLESSM || OP(o) == IFMATCH))
8615 Perl_sv_catpvf(aTHX_ sv, "[%d]", -(o->flags));
8617 PERL_UNUSED_CONTEXT;
8618 PERL_UNUSED_ARG(sv);
8620 PERL_UNUSED_ARG(prog);
8621 #endif /* DEBUGGING */
8625 Perl_re_intuit_string(pTHX_ regexp *prog)
8626 { /* Assume that RE_INTUIT is set */
8628 GET_RE_DEBUG_FLAGS_DECL;
8629 PERL_UNUSED_CONTEXT;
8633 const char * const s = SvPV_nolen_const(prog->check_substr
8634 ? prog->check_substr : prog->check_utf8);
8636 if (!PL_colorset) reginitcolors();
8637 PerlIO_printf(Perl_debug_log,
8638 "%sUsing REx %ssubstr:%s \"%s%.60s%s%s\"\n",
8640 prog->check_substr ? "" : "utf8 ",
8641 PL_colors[5],PL_colors[0],
8644 (strlen(s) > 60 ? "..." : ""));
8647 return prog->check_substr ? prog->check_substr : prog->check_utf8;
8653 handles refcounting and freeing the perl core regexp structure. When
8654 it is necessary to actually free the structure the first thing it
8655 does is call the 'free' method of the regexp_engine associated to to
8656 the regexp, allowing the handling of the void *pprivate; member
8657 first. (This routine is not overridable by extensions, which is why
8658 the extensions free is called first.)
8660 See regdupe and regdupe_internal if you change anything here.
8662 #ifndef PERL_IN_XSUB_RE
8664 Perl_pregfree(pTHX_ struct regexp *r)
8667 GET_RE_DEBUG_FLAGS_DECL;
8669 if (!r || (--r->refcnt > 0))
8672 ReREFCNT_dec(r->mother_re);
8674 CALLREGFREE_PVT(r); /* free the private data */
8676 SvREFCNT_dec(r->paren_names);
8677 Safefree(r->wrapped);
8680 if (r->anchored_substr)
8681 SvREFCNT_dec(r->anchored_substr);
8682 if (r->anchored_utf8)
8683 SvREFCNT_dec(r->anchored_utf8);
8684 if (r->float_substr)
8685 SvREFCNT_dec(r->float_substr);
8687 SvREFCNT_dec(r->float_utf8);
8688 Safefree(r->substrs);
8690 RX_MATCH_COPY_FREE(r);
8691 #ifdef PERL_OLD_COPY_ON_WRITE
8693 SvREFCNT_dec(r->saved_copy);
8702 This is a hacky workaround to the structural issue of match results
8703 being stored in the regexp structure which is in turn stored in
8704 PL_curpm/PL_reg_curpm. The problem is that due to qr// the pattern
8705 could be PL_curpm in multiple contexts, and could require multiple
8706 result sets being associated with the pattern simultaneously, such
8707 as when doing a recursive match with (??{$qr})
8709 The solution is to make a lightweight copy of the regexp structure
8710 when a qr// is returned from the code executed by (??{$qr}) this
8711 lightweight copy doesnt actually own any of its data except for
8712 the starp/end and the actual regexp structure itself.
8718 Perl_reg_temp_copy (pTHX_ struct regexp *r) {
8720 register const I32 npar = r->nparens+1;
8721 (void)ReREFCNT_inc(r);
8722 Newx(ret, 1, regexp);
8723 StructCopy(r, ret, regexp);
8724 Newx(ret->offs, npar, regexp_paren_pair);
8725 Copy(r->offs, ret->offs, npar, regexp_paren_pair);
8728 Newx(ret->substrs, 1, struct reg_substr_data);
8729 StructCopy(r->substrs, ret->substrs, struct reg_substr_data);
8731 SvREFCNT_inc_void(ret->anchored_substr);
8732 SvREFCNT_inc_void(ret->anchored_utf8);
8733 SvREFCNT_inc_void(ret->float_substr);
8734 SvREFCNT_inc_void(ret->float_utf8);
8736 /* check_substr and check_utf8, if non-NULL, point to either their
8737 anchored or float namesakes, and don't hold a second reference. */
8739 RX_MATCH_COPIED_off(ret);
8740 #ifdef PERL_OLD_COPY_ON_WRITE
8741 /* this is broken. */
8743 if (ret->saved_copy)
8744 ret->saved_copy=NULL;
8753 /* regfree_internal()
8755 Free the private data in a regexp. This is overloadable by
8756 extensions. Perl takes care of the regexp structure in pregfree(),
8757 this covers the *pprivate pointer which technically perldoesnt
8758 know about, however of course we have to handle the
8759 regexp_internal structure when no extension is in use.
8761 Note this is called before freeing anything in the regexp
8766 Perl_regfree_internal(pTHX_ struct regexp *r)
8770 GET_RE_DEBUG_FLAGS_DECL;
8776 SV *dsv= sv_newmortal();
8777 RE_PV_QUOTED_DECL(s, (r->extflags & RXf_UTF8),
8778 dsv, r->precomp, r->prelen, 60);
8779 PerlIO_printf(Perl_debug_log,"%sFreeing REx:%s %s\n",
8780 PL_colors[4],PL_colors[5],s);
8783 #ifdef RE_TRACK_PATTERN_OFFSETS
8785 Safefree(ri->u.offsets); /* 20010421 MJD */
8788 int n = ri->data->count;
8789 PAD* new_comppad = NULL;
8794 /* If you add a ->what type here, update the comment in regcomp.h */
8795 switch (ri->data->what[n]) {
8799 SvREFCNT_dec((SV*)ri->data->data[n]);
8802 Safefree(ri->data->data[n]);
8805 new_comppad = (AV*)ri->data->data[n];
8808 if (new_comppad == NULL)
8809 Perl_croak(aTHX_ "panic: pregfree comppad");
8810 PAD_SAVE_LOCAL(old_comppad,
8811 /* Watch out for global destruction's random ordering. */
8812 (SvTYPE(new_comppad) == SVt_PVAV) ? new_comppad : NULL
8815 refcnt = OpREFCNT_dec((OP_4tree*)ri->data->data[n]);
8818 op_free((OP_4tree*)ri->data->data[n]);
8820 PAD_RESTORE_LOCAL(old_comppad);
8821 SvREFCNT_dec((SV*)new_comppad);
8827 { /* Aho Corasick add-on structure for a trie node.
8828 Used in stclass optimization only */
8830 reg_ac_data *aho=(reg_ac_data*)ri->data->data[n];
8832 refcount = --aho->refcount;
8835 PerlMemShared_free(aho->states);
8836 PerlMemShared_free(aho->fail);
8837 /* do this last!!!! */
8838 PerlMemShared_free(ri->data->data[n]);
8839 PerlMemShared_free(ri->regstclass);
8845 /* trie structure. */
8847 reg_trie_data *trie=(reg_trie_data*)ri->data->data[n];
8849 refcount = --trie->refcount;
8852 PerlMemShared_free(trie->charmap);
8853 PerlMemShared_free(trie->states);
8854 PerlMemShared_free(trie->trans);
8856 PerlMemShared_free(trie->bitmap);
8858 PerlMemShared_free(trie->wordlen);
8860 PerlMemShared_free(trie->jump);
8862 PerlMemShared_free(trie->nextword);
8863 /* do this last!!!! */
8864 PerlMemShared_free(ri->data->data[n]);
8869 Perl_croak(aTHX_ "panic: regfree data code '%c'", ri->data->what[n]);
8872 Safefree(ri->data->what);
8879 #define sv_dup_inc(s,t) SvREFCNT_inc(sv_dup(s,t))
8880 #define av_dup_inc(s,t) (AV*)SvREFCNT_inc(sv_dup((SV*)s,t))
8881 #define hv_dup_inc(s,t) (HV*)SvREFCNT_inc(sv_dup((SV*)s,t))
8882 #define SAVEPVN(p,n) ((p) ? savepvn(p,n) : NULL)
8885 re_dup - duplicate a regexp.
8887 This routine is expected to clone a given regexp structure. It is not
8888 compiler under USE_ITHREADS.
8890 After all of the core data stored in struct regexp is duplicated
8891 the regexp_engine.dupe method is used to copy any private data
8892 stored in the *pprivate pointer. This allows extensions to handle
8893 any duplication it needs to do.
8895 See pregfree() and regfree_internal() if you change anything here.
8897 #if defined(USE_ITHREADS)
8898 #ifndef PERL_IN_XSUB_RE
8900 Perl_re_dup(pTHX_ const regexp *r, CLONE_PARAMS *param)
8907 return (REGEXP *)NULL;
8909 if ((ret = (REGEXP *)ptr_table_fetch(PL_ptr_table, r)))
8913 npar = r->nparens+1;
8914 Newx(ret, 1, regexp);
8915 StructCopy(r, ret, regexp);
8916 Newx(ret->offs, npar, regexp_paren_pair);
8917 Copy(r->offs, ret->offs, npar, regexp_paren_pair);
8919 /* no need to copy these */
8920 Newx(ret->swap, npar, regexp_paren_pair);
8924 /* Do it this way to avoid reading from *r after the StructCopy().
8925 That way, if any of the sv_dup_inc()s dislodge *r from the L1
8926 cache, it doesn't matter. */
8927 const bool anchored = r->check_substr == r->anchored_substr;
8928 Newx(ret->substrs, 1, struct reg_substr_data);
8929 StructCopy(r->substrs, ret->substrs, struct reg_substr_data);
8931 ret->anchored_substr = sv_dup_inc(ret->anchored_substr, param);
8932 ret->anchored_utf8 = sv_dup_inc(ret->anchored_utf8, param);
8933 ret->float_substr = sv_dup_inc(ret->float_substr, param);
8934 ret->float_utf8 = sv_dup_inc(ret->float_utf8, param);
8936 /* check_substr and check_utf8, if non-NULL, point to either their
8937 anchored or float namesakes, and don't hold a second reference. */
8939 if (ret->check_substr) {
8941 assert(r->check_utf8 == r->anchored_utf8);
8942 ret->check_substr = ret->anchored_substr;
8943 ret->check_utf8 = ret->anchored_utf8;
8945 assert(r->check_substr == r->float_substr);
8946 assert(r->check_utf8 == r->float_utf8);
8947 ret->check_substr = ret->float_substr;
8948 ret->check_utf8 = ret->float_utf8;
8953 ret->wrapped = SAVEPVN(ret->wrapped, ret->wraplen+1);
8954 ret->precomp = ret->wrapped + (ret->precomp - ret->wrapped);
8955 ret->paren_names = hv_dup_inc(ret->paren_names, param);
8958 RXi_SET(ret,CALLREGDUPE_PVT(ret,param));
8960 if (RX_MATCH_COPIED(ret))
8961 ret->subbeg = SAVEPVN(ret->subbeg, ret->sublen);
8964 #ifdef PERL_OLD_COPY_ON_WRITE
8965 ret->saved_copy = NULL;
8968 ret->mother_re = NULL;
8970 ret->seen_evals = 0;
8972 ptr_table_store(PL_ptr_table, r, ret);
8975 #endif /* PERL_IN_XSUB_RE */
8980 This is the internal complement to regdupe() which is used to copy
8981 the structure pointed to by the *pprivate pointer in the regexp.
8982 This is the core version of the extension overridable cloning hook.
8983 The regexp structure being duplicated will be copied by perl prior
8984 to this and will be provided as the regexp *r argument, however
8985 with the /old/ structures pprivate pointer value. Thus this routine
8986 may override any copying normally done by perl.
8988 It returns a pointer to the new regexp_internal structure.
8992 Perl_regdupe_internal(pTHX_ const regexp *r, CLONE_PARAMS *param)
8995 regexp_internal *reti;
8999 npar = r->nparens+1;
9002 Newxc(reti, sizeof(regexp_internal) + (len+1)*sizeof(regnode), char, regexp_internal);
9003 Copy(ri->program, reti->program, len+1, regnode);
9006 reti->regstclass = NULL;
9010 const int count = ri->data->count;
9013 Newxc(d, sizeof(struct reg_data) + count*sizeof(void *),
9014 char, struct reg_data);
9015 Newx(d->what, count, U8);
9018 for (i = 0; i < count; i++) {
9019 d->what[i] = ri->data->what[i];
9020 switch (d->what[i]) {
9021 /* legal options are one of: sSfpontTu
9022 see also regcomp.h and pregfree() */
9025 case 'p': /* actually an AV, but the dup function is identical. */
9026 case 'u': /* actually an HV, but the dup function is identical. */
9027 d->data[i] = sv_dup_inc((SV *)ri->data->data[i], param);
9030 /* This is cheating. */
9031 Newx(d->data[i], 1, struct regnode_charclass_class);
9032 StructCopy(ri->data->data[i], d->data[i],
9033 struct regnode_charclass_class);
9034 reti->regstclass = (regnode*)d->data[i];
9037 /* Compiled op trees are readonly and in shared memory,
9038 and can thus be shared without duplication. */
9040 d->data[i] = (void*)OpREFCNT_inc((OP*)ri->data->data[i]);
9044 /* Trie stclasses are readonly and can thus be shared
9045 * without duplication. We free the stclass in pregfree
9046 * when the corresponding reg_ac_data struct is freed.
9048 reti->regstclass= ri->regstclass;
9052 ((reg_trie_data*)ri->data->data[i])->refcount++;
9056 d->data[i] = ri->data->data[i];
9059 Perl_croak(aTHX_ "panic: re_dup unknown data code '%c'", ri->data->what[i]);
9068 reti->name_list_idx = ri->name_list_idx;
9070 #ifdef RE_TRACK_PATTERN_OFFSETS
9071 if (ri->u.offsets) {
9072 Newx(reti->u.offsets, 2*len+1, U32);
9073 Copy(ri->u.offsets, reti->u.offsets, 2*len+1, U32);
9076 SetProgLen(reti,len);
9082 #endif /* USE_ITHREADS */
9087 converts a regexp embedded in a MAGIC struct to its stringified form,
9088 caching the converted form in the struct and returns the cached
9091 If lp is nonnull then it is used to return the length of the
9094 If flags is nonnull and the returned string contains UTF8 then
9095 (*flags & 1) will be true.
9097 If haseval is nonnull then it is used to return whether the pattern
9100 Normally called via macro:
9102 CALLREG_STRINGIFY(mg,&len,&utf8);
9106 CALLREG_AS_STR(mg,&lp,&flags,&haseval)
9108 See sv_2pv_flags() in sv.c for an example of internal usage.
9111 #ifndef PERL_IN_XSUB_RE
9114 Perl_reg_stringify(pTHX_ MAGIC *mg, STRLEN *lp, U32 *flags, I32 *haseval ) {
9116 const regexp * const re = (regexp *)mg->mg_obj;
9118 *haseval = re->seen_evals;
9120 *flags = ((re->extflags & RXf_UTF8) ? 1 : 0);
9127 - regnext - dig the "next" pointer out of a node
9130 Perl_regnext(pTHX_ register regnode *p)
9133 register I32 offset;
9138 offset = (reg_off_by_arg[OP(p)] ? ARG(p) : NEXT_OFF(p));
9147 S_re_croak2(pTHX_ const char* pat1,const char* pat2,...)
9150 STRLEN l1 = strlen(pat1);
9151 STRLEN l2 = strlen(pat2);
9154 const char *message;
9160 Copy(pat1, buf, l1 , char);
9161 Copy(pat2, buf + l1, l2 , char);
9162 buf[l1 + l2] = '\n';
9163 buf[l1 + l2 + 1] = '\0';
9165 /* ANSI variant takes additional second argument */
9166 va_start(args, pat2);
9170 msv = vmess(buf, &args);
9172 message = SvPV_const(msv,l1);
9175 Copy(message, buf, l1 , char);
9176 buf[l1-1] = '\0'; /* Overwrite \n */
9177 Perl_croak(aTHX_ "%s", buf);
9180 /* XXX Here's a total kludge. But we need to re-enter for swash routines. */
9182 #ifndef PERL_IN_XSUB_RE
9184 Perl_save_re_context(pTHX)
9188 struct re_save_state *state;
9190 SAVEVPTR(PL_curcop);
9191 SSGROW(SAVESTACK_ALLOC_FOR_RE_SAVE_STATE + 1);
9193 state = (struct re_save_state *)(PL_savestack + PL_savestack_ix);
9194 PL_savestack_ix += SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
9195 SSPUSHINT(SAVEt_RE_STATE);
9197 Copy(&PL_reg_state, state, 1, struct re_save_state);
9199 PL_reg_start_tmp = 0;
9200 PL_reg_start_tmpl = 0;
9201 PL_reg_oldsaved = NULL;
9202 PL_reg_oldsavedlen = 0;
9204 PL_reg_leftiter = 0;
9205 PL_reg_poscache = NULL;
9206 PL_reg_poscache_size = 0;
9207 #ifdef PERL_OLD_COPY_ON_WRITE
9211 /* Save $1..$n (#18107: UTF-8 s/(\w+)/uc($1)/e); AMS 20021106. */
9213 const REGEXP * const rx = PM_GETRE(PL_curpm);
9216 for (i = 1; i <= rx->nparens; i++) {
9217 char digits[TYPE_CHARS(long)];
9218 const STRLEN len = my_snprintf(digits, sizeof(digits), "%lu", (long)i);
9219 GV *const *const gvp
9220 = (GV**)hv_fetch(PL_defstash, digits, len, 0);
9223 GV * const gv = *gvp;
9224 if (SvTYPE(gv) == SVt_PVGV && GvSV(gv))
9234 clear_re(pTHX_ void *r)
9237 ReREFCNT_dec((regexp *)r);
9243 S_put_byte(pTHX_ SV *sv, int c)
9245 if (isCNTRL(c) || c == 255 || !isPRINT(c))
9246 Perl_sv_catpvf(aTHX_ sv, "\\%o", c);
9247 else if (c == '-' || c == ']' || c == '\\' || c == '^')
9248 Perl_sv_catpvf(aTHX_ sv, "\\%c", c);
9250 Perl_sv_catpvf(aTHX_ sv, "%c", c);
9254 #define CLEAR_OPTSTART \
9255 if (optstart) STMT_START { \
9256 DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log, " (%"IVdf" nodes)\n", (IV)(node - optstart))); \
9260 #define DUMPUNTIL(b,e) CLEAR_OPTSTART; node=dumpuntil(r,start,(b),(e),last,sv,indent+1,depth+1);
9262 STATIC const regnode *
9263 S_dumpuntil(pTHX_ const regexp *r, const regnode *start, const regnode *node,
9264 const regnode *last, const regnode *plast,
9265 SV* sv, I32 indent, U32 depth)
9268 register U8 op = PSEUDO; /* Arbitrary non-END op. */
9269 register const regnode *next;
9270 const regnode *optstart= NULL;
9273 GET_RE_DEBUG_FLAGS_DECL;
9275 #ifdef DEBUG_DUMPUNTIL
9276 PerlIO_printf(Perl_debug_log, "--- %d : %d - %d - %d\n",indent,node-start,
9277 last ? last-start : 0,plast ? plast-start : 0);
9280 if (plast && plast < last)
9283 while (PL_regkind[op] != END && (!last || node < last)) {
9284 /* While that wasn't END last time... */
9287 if (op == CLOSE || op == WHILEM)
9289 next = regnext((regnode *)node);
9292 if (OP(node) == OPTIMIZED) {
9293 if (!optstart && RE_DEBUG_FLAG(RE_DEBUG_COMPILE_OPTIMISE))
9300 regprop(r, sv, node);
9301 PerlIO_printf(Perl_debug_log, "%4"IVdf":%*s%s", (IV)(node - start),
9302 (int)(2*indent + 1), "", SvPVX_const(sv));
9304 if (OP(node) != OPTIMIZED) {
9305 if (next == NULL) /* Next ptr. */
9306 PerlIO_printf(Perl_debug_log, " (0)");
9307 else if (PL_regkind[(U8)op] == BRANCH && PL_regkind[OP(next)] != BRANCH )
9308 PerlIO_printf(Perl_debug_log, " (FAIL)");
9310 PerlIO_printf(Perl_debug_log, " (%"IVdf")", (IV)(next - start));
9311 (void)PerlIO_putc(Perl_debug_log, '\n');
9315 if (PL_regkind[(U8)op] == BRANCHJ) {
9318 register const regnode *nnode = (OP(next) == LONGJMP
9319 ? regnext((regnode *)next)
9321 if (last && nnode > last)
9323 DUMPUNTIL(NEXTOPER(NEXTOPER(node)), nnode);
9326 else if (PL_regkind[(U8)op] == BRANCH) {
9328 DUMPUNTIL(NEXTOPER(node), next);
9330 else if ( PL_regkind[(U8)op] == TRIE ) {
9331 const regnode *this_trie = node;
9332 const char op = OP(node);
9333 const U32 n = ARG(node);
9334 const reg_ac_data * const ac = op>=AHOCORASICK ?
9335 (reg_ac_data *)ri->data->data[n] :
9337 const reg_trie_data * const trie =
9338 (reg_trie_data*)ri->data->data[op<AHOCORASICK ? n : ac->trie];
9340 AV *const trie_words = (AV *) ri->data->data[n + TRIE_WORDS_OFFSET];
9342 const regnode *nextbranch= NULL;
9344 sv_setpvn(sv, "", 0);
9345 for (word_idx= 0; word_idx < (I32)trie->wordcount; word_idx++) {
9346 SV ** const elem_ptr = av_fetch(trie_words,word_idx,0);
9348 PerlIO_printf(Perl_debug_log, "%*s%s ",
9349 (int)(2*(indent+3)), "",
9350 elem_ptr ? pv_pretty(sv, SvPV_nolen_const(*elem_ptr), SvCUR(*elem_ptr), 60,
9351 PL_colors[0], PL_colors[1],
9352 (SvUTF8(*elem_ptr) ? PERL_PV_ESCAPE_UNI : 0) |
9353 PERL_PV_PRETTY_ELIPSES |
9359 U16 dist= trie->jump[word_idx+1];
9360 PerlIO_printf(Perl_debug_log, "(%"UVuf")\n",
9361 (UV)((dist ? this_trie + dist : next) - start));
9364 nextbranch= this_trie + trie->jump[0];
9365 DUMPUNTIL(this_trie + dist, nextbranch);
9367 if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
9368 nextbranch= regnext((regnode *)nextbranch);
9370 PerlIO_printf(Perl_debug_log, "\n");
9373 if (last && next > last)
9378 else if ( op == CURLY ) { /* "next" might be very big: optimizer */
9379 DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS,
9380 NEXTOPER(node) + EXTRA_STEP_2ARGS + 1);
9382 else if (PL_regkind[(U8)op] == CURLY && op != CURLYX) {
9384 DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS, next);
9386 else if ( op == PLUS || op == STAR) {
9387 DUMPUNTIL(NEXTOPER(node), NEXTOPER(node) + 1);
9389 else if (op == ANYOF) {
9390 /* arglen 1 + class block */
9391 node += 1 + ((ANYOF_FLAGS(node) & ANYOF_LARGE)
9392 ? ANYOF_CLASS_SKIP : ANYOF_SKIP);
9393 node = NEXTOPER(node);
9395 else if (PL_regkind[(U8)op] == EXACT) {
9396 /* Literal string, where present. */
9397 node += NODE_SZ_STR(node) - 1;
9398 node = NEXTOPER(node);
9401 node = NEXTOPER(node);
9402 node += regarglen[(U8)op];
9404 if (op == CURLYX || op == OPEN)
9408 #ifdef DEBUG_DUMPUNTIL
9409 PerlIO_printf(Perl_debug_log, "--- %d\n", (int)indent);
9414 #endif /* DEBUGGING */
9418 * c-indentation-style: bsd
9420 * indent-tabs-mode: t
9423 * ex: set ts=8 sts=4 sw=4 noet:
https://perl5.git.perl.org / perl5.git / blob