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)
2403 #define CASE_SYNST_FNC(nAmE) \
2405 if (flags & SCF_DO_STCLASS_AND) { \
2406 for (value = 0; value < 256; value++) \
2407 if (!is_ ## nAmE ## _cp(value)) \
2408 ANYOF_BITMAP_CLEAR(data->start_class, value); \
2411 for (value = 0; value < 256; value++) \
2412 if (is_ ## nAmE ## _cp(value)) \
2413 ANYOF_BITMAP_SET(data->start_class, value); \
2417 if (flags & SCF_DO_STCLASS_AND) { \
2418 for (value = 0; value < 256; value++) \
2419 if (is_ ## nAmE ## _cp(value)) \
2420 ANYOF_BITMAP_CLEAR(data->start_class, value); \
2423 for (value = 0; value < 256; value++) \
2424 if (!is_ ## nAmE ## _cp(value)) \
2425 ANYOF_BITMAP_SET(data->start_class, value); \
2432 S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp,
2433 I32 *minlenp, I32 *deltap,
2438 struct regnode_charclass_class *and_withp,
2439 U32 flags, U32 depth)
2440 /* scanp: Start here (read-write). */
2441 /* deltap: Write maxlen-minlen here. */
2442 /* last: Stop before this one. */
2443 /* data: string data about the pattern */
2444 /* stopparen: treat close N as END */
2445 /* recursed: which subroutines have we recursed into */
2446 /* and_withp: Valid if flags & SCF_DO_STCLASS_OR */
2449 I32 min = 0, pars = 0, code;
2450 regnode *scan = *scanp, *next;
2452 int is_inf = (flags & SCF_DO_SUBSTR) && (data->flags & SF_IS_INF);
2453 int is_inf_internal = 0; /* The studied chunk is infinite */
2454 I32 is_par = OP(scan) == OPEN ? ARG(scan) : 0;
2455 scan_data_t data_fake;
2456 SV *re_trie_maxbuff = NULL;
2457 regnode *first_non_open = scan;
2458 I32 stopmin = I32_MAX;
2459 scan_frame *frame = NULL;
2461 GET_RE_DEBUG_FLAGS_DECL;
2464 StructCopy(&zero_scan_data, &data_fake, scan_data_t);
2468 while (first_non_open && OP(first_non_open) == OPEN)
2469 first_non_open=regnext(first_non_open);
2474 while ( scan && OP(scan) != END && scan < last ){
2475 /* Peephole optimizer: */
2476 DEBUG_STUDYDATA("Peep:", data,depth);
2477 DEBUG_PEEP("Peep",scan,depth);
2478 JOIN_EXACT(scan,&min,0);
2480 /* Follow the next-chain of the current node and optimize
2481 away all the NOTHINGs from it. */
2482 if (OP(scan) != CURLYX) {
2483 const int max = (reg_off_by_arg[OP(scan)]
2485 /* I32 may be smaller than U16 on CRAYs! */
2486 : (I32_MAX < U16_MAX ? I32_MAX : U16_MAX));
2487 int off = (reg_off_by_arg[OP(scan)] ? ARG(scan) : NEXT_OFF(scan));
2491 /* Skip NOTHING and LONGJMP. */
2492 while ((n = regnext(n))
2493 && ((PL_regkind[OP(n)] == NOTHING && (noff = NEXT_OFF(n)))
2494 || ((OP(n) == LONGJMP) && (noff = ARG(n))))
2495 && off + noff < max)
2497 if (reg_off_by_arg[OP(scan)])
2500 NEXT_OFF(scan) = off;
2505 /* The principal pseudo-switch. Cannot be a switch, since we
2506 look into several different things. */
2507 if (OP(scan) == BRANCH || OP(scan) == BRANCHJ
2508 || OP(scan) == IFTHEN) {
2509 next = regnext(scan);
2511 /* demq: the op(next)==code check is to see if we have "branch-branch" AFAICT */
2513 if (OP(next) == code || code == IFTHEN) {
2514 /* NOTE - There is similar code to this block below for handling
2515 TRIE nodes on a re-study. If you change stuff here check there
2517 I32 max1 = 0, min1 = I32_MAX, num = 0;
2518 struct regnode_charclass_class accum;
2519 regnode * const startbranch=scan;
2521 if (flags & SCF_DO_SUBSTR)
2522 SCAN_COMMIT(pRExC_state, data, minlenp); /* Cannot merge strings after this. */
2523 if (flags & SCF_DO_STCLASS)
2524 cl_init_zero(pRExC_state, &accum);
2526 while (OP(scan) == code) {
2527 I32 deltanext, minnext, f = 0, fake;
2528 struct regnode_charclass_class this_class;
2531 data_fake.flags = 0;
2533 data_fake.whilem_c = data->whilem_c;
2534 data_fake.last_closep = data->last_closep;
2537 data_fake.last_closep = &fake;
2539 data_fake.pos_delta = delta;
2540 next = regnext(scan);
2541 scan = NEXTOPER(scan);
2543 scan = NEXTOPER(scan);
2544 if (flags & SCF_DO_STCLASS) {
2545 cl_init(pRExC_state, &this_class);
2546 data_fake.start_class = &this_class;
2547 f = SCF_DO_STCLASS_AND;
2549 if (flags & SCF_WHILEM_VISITED_POS)
2550 f |= SCF_WHILEM_VISITED_POS;
2552 /* we suppose the run is continuous, last=next...*/
2553 minnext = study_chunk(pRExC_state, &scan, minlenp, &deltanext,
2555 stopparen, recursed, NULL, f,depth+1);
2558 if (max1 < minnext + deltanext)
2559 max1 = minnext + deltanext;
2560 if (deltanext == I32_MAX)
2561 is_inf = is_inf_internal = 1;
2563 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
2565 if (data_fake.flags & SCF_SEEN_ACCEPT) {
2566 if ( stopmin > minnext)
2567 stopmin = min + min1;
2568 flags &= ~SCF_DO_SUBSTR;
2570 data->flags |= SCF_SEEN_ACCEPT;
2573 if (data_fake.flags & SF_HAS_EVAL)
2574 data->flags |= SF_HAS_EVAL;
2575 data->whilem_c = data_fake.whilem_c;
2577 if (flags & SCF_DO_STCLASS)
2578 cl_or(pRExC_state, &accum, &this_class);
2580 if (code == IFTHEN && num < 2) /* Empty ELSE branch */
2582 if (flags & SCF_DO_SUBSTR) {
2583 data->pos_min += min1;
2584 data->pos_delta += max1 - min1;
2585 if (max1 != min1 || is_inf)
2586 data->longest = &(data->longest_float);
2589 delta += max1 - min1;
2590 if (flags & SCF_DO_STCLASS_OR) {
2591 cl_or(pRExC_state, data->start_class, &accum);
2593 cl_and(data->start_class, and_withp);
2594 flags &= ~SCF_DO_STCLASS;
2597 else if (flags & SCF_DO_STCLASS_AND) {
2599 cl_and(data->start_class, &accum);
2600 flags &= ~SCF_DO_STCLASS;
2603 /* Switch to OR mode: cache the old value of
2604 * data->start_class */
2606 StructCopy(data->start_class, and_withp,
2607 struct regnode_charclass_class);
2608 flags &= ~SCF_DO_STCLASS_AND;
2609 StructCopy(&accum, data->start_class,
2610 struct regnode_charclass_class);
2611 flags |= SCF_DO_STCLASS_OR;
2612 data->start_class->flags |= ANYOF_EOS;
2616 if (PERL_ENABLE_TRIE_OPTIMISATION && OP( startbranch ) == BRANCH ) {
2619 Assuming this was/is a branch we are dealing with: 'scan' now
2620 points at the item that follows the branch sequence, whatever
2621 it is. We now start at the beginning of the sequence and look
2628 which would be constructed from a pattern like /A|LIST|OF|WORDS/
2630 If we can find such a subseqence we need to turn the first
2631 element into a trie and then add the subsequent branch exact
2632 strings to the trie.
2636 1. patterns where the whole set of branch can be converted.
2638 2. patterns where only a subset can be converted.
2640 In case 1 we can replace the whole set with a single regop
2641 for the trie. In case 2 we need to keep the start and end
2644 'BRANCH EXACT; BRANCH EXACT; BRANCH X'
2645 becomes BRANCH TRIE; BRANCH X;
2647 There is an additional case, that being where there is a
2648 common prefix, which gets split out into an EXACT like node
2649 preceding the TRIE node.
2651 If x(1..n)==tail then we can do a simple trie, if not we make
2652 a "jump" trie, such that when we match the appropriate word
2653 we "jump" to the appopriate tail node. Essentailly we turn
2654 a nested if into a case structure of sorts.
2659 if (!re_trie_maxbuff) {
2660 re_trie_maxbuff = get_sv(RE_TRIE_MAXBUF_NAME, 1);
2661 if (!SvIOK(re_trie_maxbuff))
2662 sv_setiv(re_trie_maxbuff, RE_TRIE_MAXBUF_INIT);
2664 if ( SvIV(re_trie_maxbuff)>=0 ) {
2666 regnode *first = (regnode *)NULL;
2667 regnode *last = (regnode *)NULL;
2668 regnode *tail = scan;
2673 SV * const mysv = sv_newmortal(); /* for dumping */
2675 /* var tail is used because there may be a TAIL
2676 regop in the way. Ie, the exacts will point to the
2677 thing following the TAIL, but the last branch will
2678 point at the TAIL. So we advance tail. If we
2679 have nested (?:) we may have to move through several
2683 while ( OP( tail ) == TAIL ) {
2684 /* this is the TAIL generated by (?:) */
2685 tail = regnext( tail );
2690 regprop(RExC_rx, mysv, tail );
2691 PerlIO_printf( Perl_debug_log, "%*s%s%s\n",
2692 (int)depth * 2 + 2, "",
2693 "Looking for TRIE'able sequences. Tail node is: ",
2694 SvPV_nolen_const( mysv )
2700 step through the branches, cur represents each
2701 branch, noper is the first thing to be matched
2702 as part of that branch and noper_next is the
2703 regnext() of that node. if noper is an EXACT
2704 and noper_next is the same as scan (our current
2705 position in the regex) then the EXACT branch is
2706 a possible optimization target. Once we have
2707 two or more consequetive such branches we can
2708 create a trie of the EXACT's contents and stich
2709 it in place. If the sequence represents all of
2710 the branches we eliminate the whole thing and
2711 replace it with a single TRIE. If it is a
2712 subsequence then we need to stitch it in. This
2713 means the first branch has to remain, and needs
2714 to be repointed at the item on the branch chain
2715 following the last branch optimized. This could
2716 be either a BRANCH, in which case the
2717 subsequence is internal, or it could be the
2718 item following the branch sequence in which
2719 case the subsequence is at the end.
2723 /* dont use tail as the end marker for this traverse */
2724 for ( cur = startbranch ; cur != scan ; cur = regnext( cur ) ) {
2725 regnode * const noper = NEXTOPER( cur );
2726 #if defined(DEBUGGING) || defined(NOJUMPTRIE)
2727 regnode * const noper_next = regnext( noper );
2731 regprop(RExC_rx, mysv, cur);
2732 PerlIO_printf( Perl_debug_log, "%*s- %s (%d)",
2733 (int)depth * 2 + 2,"", SvPV_nolen_const( mysv ), REG_NODE_NUM(cur) );
2735 regprop(RExC_rx, mysv, noper);
2736 PerlIO_printf( Perl_debug_log, " -> %s",
2737 SvPV_nolen_const(mysv));
2740 regprop(RExC_rx, mysv, noper_next );
2741 PerlIO_printf( Perl_debug_log,"\t=> %s\t",
2742 SvPV_nolen_const(mysv));
2744 PerlIO_printf( Perl_debug_log, "(First==%d,Last==%d,Cur==%d)\n",
2745 REG_NODE_NUM(first), REG_NODE_NUM(last), REG_NODE_NUM(cur) );
2747 if ( (((first && optype!=NOTHING) ? OP( noper ) == optype
2748 : PL_regkind[ OP( noper ) ] == EXACT )
2749 || OP(noper) == NOTHING )
2751 && noper_next == tail
2756 if ( !first || optype == NOTHING ) {
2757 if (!first) first = cur;
2758 optype = OP( noper );
2764 make_trie( pRExC_state,
2765 startbranch, first, cur, tail, count,
2768 if ( PL_regkind[ OP( noper ) ] == EXACT
2770 && noper_next == tail
2775 optype = OP( noper );
2785 regprop(RExC_rx, mysv, cur);
2786 PerlIO_printf( Perl_debug_log,
2787 "%*s- %s (%d) <SCAN FINISHED>\n", (int)depth * 2 + 2,
2788 "", SvPV_nolen_const( mysv ),REG_NODE_NUM(cur));
2792 made= make_trie( pRExC_state, startbranch, first, scan, tail, count, optype, depth+1 );
2793 #ifdef TRIE_STUDY_OPT
2794 if ( ((made == MADE_EXACT_TRIE &&
2795 startbranch == first)
2796 || ( first_non_open == first )) &&
2798 flags |= SCF_TRIE_RESTUDY;
2799 if ( startbranch == first
2802 RExC_seen &=~REG_TOP_LEVEL_BRANCHES;
2812 else if ( code == BRANCHJ ) { /* single branch is optimized. */
2813 scan = NEXTOPER(NEXTOPER(scan));
2814 } else /* single branch is optimized. */
2815 scan = NEXTOPER(scan);
2817 } else if (OP(scan) == SUSPEND || OP(scan) == GOSUB || OP(scan) == GOSTART) {
2818 scan_frame *newframe = NULL;
2823 if (OP(scan) != SUSPEND) {
2824 /* set the pointer */
2825 if (OP(scan) == GOSUB) {
2827 RExC_recurse[ARG2L(scan)] = scan;
2828 start = RExC_open_parens[paren-1];
2829 end = RExC_close_parens[paren-1];
2832 start = RExC_rxi->program + 1;
2836 Newxz(recursed, (((RExC_npar)>>3) +1), U8);
2837 SAVEFREEPV(recursed);
2839 if (!PAREN_TEST(recursed,paren+1)) {
2840 PAREN_SET(recursed,paren+1);
2841 Newx(newframe,1,scan_frame);
2843 if (flags & SCF_DO_SUBSTR) {
2844 SCAN_COMMIT(pRExC_state,data,minlenp);
2845 data->longest = &(data->longest_float);
2847 is_inf = is_inf_internal = 1;
2848 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
2849 cl_anything(pRExC_state, data->start_class);
2850 flags &= ~SCF_DO_STCLASS;
2853 Newx(newframe,1,scan_frame);
2856 end = regnext(scan);
2861 SAVEFREEPV(newframe);
2862 newframe->next = regnext(scan);
2863 newframe->last = last;
2864 newframe->stop = stopparen;
2865 newframe->prev = frame;
2875 else if (OP(scan) == EXACT) {
2876 I32 l = STR_LEN(scan);
2879 const U8 * const s = (U8*)STRING(scan);
2880 l = utf8_length(s, s + l);
2881 uc = utf8_to_uvchr(s, NULL);
2883 uc = *((U8*)STRING(scan));
2886 if (flags & SCF_DO_SUBSTR) { /* Update longest substr. */
2887 /* The code below prefers earlier match for fixed
2888 offset, later match for variable offset. */
2889 if (data->last_end == -1) { /* Update the start info. */
2890 data->last_start_min = data->pos_min;
2891 data->last_start_max = is_inf
2892 ? I32_MAX : data->pos_min + data->pos_delta;
2894 sv_catpvn(data->last_found, STRING(scan), STR_LEN(scan));
2896 SvUTF8_on(data->last_found);
2898 SV * const sv = data->last_found;
2899 MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
2900 mg_find(sv, PERL_MAGIC_utf8) : NULL;
2901 if (mg && mg->mg_len >= 0)
2902 mg->mg_len += utf8_length((U8*)STRING(scan),
2903 (U8*)STRING(scan)+STR_LEN(scan));
2905 data->last_end = data->pos_min + l;
2906 data->pos_min += l; /* As in the first entry. */
2907 data->flags &= ~SF_BEFORE_EOL;
2909 if (flags & SCF_DO_STCLASS_AND) {
2910 /* Check whether it is compatible with what we know already! */
2914 (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
2915 && !ANYOF_BITMAP_TEST(data->start_class, uc)
2916 && (!(data->start_class->flags & ANYOF_FOLD)
2917 || !ANYOF_BITMAP_TEST(data->start_class, PL_fold[uc])))
2920 ANYOF_CLASS_ZERO(data->start_class);
2921 ANYOF_BITMAP_ZERO(data->start_class);
2923 ANYOF_BITMAP_SET(data->start_class, uc);
2924 data->start_class->flags &= ~ANYOF_EOS;
2926 data->start_class->flags &= ~ANYOF_UNICODE_ALL;
2928 else if (flags & SCF_DO_STCLASS_OR) {
2929 /* false positive possible if the class is case-folded */
2931 ANYOF_BITMAP_SET(data->start_class, uc);
2933 data->start_class->flags |= ANYOF_UNICODE_ALL;
2934 data->start_class->flags &= ~ANYOF_EOS;
2935 cl_and(data->start_class, and_withp);
2937 flags &= ~SCF_DO_STCLASS;
2939 else if (PL_regkind[OP(scan)] == EXACT) { /* But OP != EXACT! */
2940 I32 l = STR_LEN(scan);
2941 UV uc = *((U8*)STRING(scan));
2943 /* Search for fixed substrings supports EXACT only. */
2944 if (flags & SCF_DO_SUBSTR) {
2946 SCAN_COMMIT(pRExC_state, data, minlenp);
2949 const U8 * const s = (U8 *)STRING(scan);
2950 l = utf8_length(s, s + l);
2951 uc = utf8_to_uvchr(s, NULL);
2954 if (flags & SCF_DO_SUBSTR)
2956 if (flags & SCF_DO_STCLASS_AND) {
2957 /* Check whether it is compatible with what we know already! */
2961 (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
2962 && !ANYOF_BITMAP_TEST(data->start_class, uc)
2963 && !ANYOF_BITMAP_TEST(data->start_class, PL_fold[uc])))
2965 ANYOF_CLASS_ZERO(data->start_class);
2966 ANYOF_BITMAP_ZERO(data->start_class);
2968 ANYOF_BITMAP_SET(data->start_class, uc);
2969 data->start_class->flags &= ~ANYOF_EOS;
2970 data->start_class->flags |= ANYOF_FOLD;
2971 if (OP(scan) == EXACTFL)
2972 data->start_class->flags |= ANYOF_LOCALE;
2975 else if (flags & SCF_DO_STCLASS_OR) {
2976 if (data->start_class->flags & ANYOF_FOLD) {
2977 /* false positive possible if the class is case-folded.
2978 Assume that the locale settings are the same... */
2980 ANYOF_BITMAP_SET(data->start_class, uc);
2981 data->start_class->flags &= ~ANYOF_EOS;
2983 cl_and(data->start_class, and_withp);
2985 flags &= ~SCF_DO_STCLASS;
2987 else if (strchr((const char*)PL_varies,OP(scan))) {
2988 I32 mincount, maxcount, minnext, deltanext, fl = 0;
2989 I32 f = flags, pos_before = 0;
2990 regnode * const oscan = scan;
2991 struct regnode_charclass_class this_class;
2992 struct regnode_charclass_class *oclass = NULL;
2993 I32 next_is_eval = 0;
2995 switch (PL_regkind[OP(scan)]) {
2996 case WHILEM: /* End of (?:...)* . */
2997 scan = NEXTOPER(scan);
3000 if (flags & (SCF_DO_SUBSTR | SCF_DO_STCLASS)) {
3001 next = NEXTOPER(scan);
3002 if (OP(next) == EXACT || (flags & SCF_DO_STCLASS)) {
3004 maxcount = REG_INFTY;
3005 next = regnext(scan);
3006 scan = NEXTOPER(scan);
3010 if (flags & SCF_DO_SUBSTR)
3015 if (flags & SCF_DO_STCLASS) {
3017 maxcount = REG_INFTY;
3018 next = regnext(scan);
3019 scan = NEXTOPER(scan);
3022 is_inf = is_inf_internal = 1;
3023 scan = regnext(scan);
3024 if (flags & SCF_DO_SUBSTR) {
3025 SCAN_COMMIT(pRExC_state, data, minlenp); /* Cannot extend fixed substrings */
3026 data->longest = &(data->longest_float);
3028 goto optimize_curly_tail;
3030 if (stopparen>0 && (OP(scan)==CURLYN || OP(scan)==CURLYM)
3031 && (scan->flags == stopparen))
3036 mincount = ARG1(scan);
3037 maxcount = ARG2(scan);
3039 next = regnext(scan);
3040 if (OP(scan) == CURLYX) {
3041 I32 lp = (data ? *(data->last_closep) : 0);
3042 scan->flags = ((lp <= (I32)U8_MAX) ? (U8)lp : U8_MAX);
3044 scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS;
3045 next_is_eval = (OP(scan) == EVAL);
3047 if (flags & SCF_DO_SUBSTR) {
3048 if (mincount == 0) SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot extend fixed substrings */
3049 pos_before = data->pos_min;
3053 data->flags &= ~(SF_HAS_PAR|SF_IN_PAR|SF_HAS_EVAL);
3055 data->flags |= SF_IS_INF;
3057 if (flags & SCF_DO_STCLASS) {
3058 cl_init(pRExC_state, &this_class);
3059 oclass = data->start_class;
3060 data->start_class = &this_class;
3061 f |= SCF_DO_STCLASS_AND;
3062 f &= ~SCF_DO_STCLASS_OR;
3064 /* These are the cases when once a subexpression
3065 fails at a particular position, it cannot succeed
3066 even after backtracking at the enclosing scope.
3068 XXXX what if minimal match and we are at the
3069 initial run of {n,m}? */
3070 if ((mincount != maxcount - 1) && (maxcount != REG_INFTY))
3071 f &= ~SCF_WHILEM_VISITED_POS;
3073 /* This will finish on WHILEM, setting scan, or on NULL: */
3074 minnext = study_chunk(pRExC_state, &scan, minlenp, &deltanext,
3075 last, data, stopparen, recursed, NULL,
3077 ? (f & ~SCF_DO_SUBSTR) : f),depth+1);
3079 if (flags & SCF_DO_STCLASS)
3080 data->start_class = oclass;
3081 if (mincount == 0 || minnext == 0) {
3082 if (flags & SCF_DO_STCLASS_OR) {
3083 cl_or(pRExC_state, data->start_class, &this_class);
3085 else if (flags & SCF_DO_STCLASS_AND) {
3086 /* Switch to OR mode: cache the old value of
3087 * data->start_class */
3089 StructCopy(data->start_class, and_withp,
3090 struct regnode_charclass_class);
3091 flags &= ~SCF_DO_STCLASS_AND;
3092 StructCopy(&this_class, data->start_class,
3093 struct regnode_charclass_class);
3094 flags |= SCF_DO_STCLASS_OR;
3095 data->start_class->flags |= ANYOF_EOS;
3097 } else { /* Non-zero len */
3098 if (flags & SCF_DO_STCLASS_OR) {
3099 cl_or(pRExC_state, data->start_class, &this_class);
3100 cl_and(data->start_class, and_withp);
3102 else if (flags & SCF_DO_STCLASS_AND)
3103 cl_and(data->start_class, &this_class);
3104 flags &= ~SCF_DO_STCLASS;
3106 if (!scan) /* It was not CURLYX, but CURLY. */
3108 if ( /* ? quantifier ok, except for (?{ ... }) */
3109 (next_is_eval || !(mincount == 0 && maxcount == 1))
3110 && (minnext == 0) && (deltanext == 0)
3111 && data && !(data->flags & (SF_HAS_PAR|SF_IN_PAR))
3112 && maxcount <= REG_INFTY/3 /* Complement check for big count */
3113 && ckWARN(WARN_REGEXP))
3116 "Quantifier unexpected on zero-length expression");
3119 min += minnext * mincount;
3120 is_inf_internal |= ((maxcount == REG_INFTY
3121 && (minnext + deltanext) > 0)
3122 || deltanext == I32_MAX);
3123 is_inf |= is_inf_internal;
3124 delta += (minnext + deltanext) * maxcount - minnext * mincount;
3126 /* Try powerful optimization CURLYX => CURLYN. */
3127 if ( OP(oscan) == CURLYX && data
3128 && data->flags & SF_IN_PAR
3129 && !(data->flags & SF_HAS_EVAL)
3130 && !deltanext && minnext == 1 ) {
3131 /* Try to optimize to CURLYN. */
3132 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS;
3133 regnode * const nxt1 = nxt;
3140 if (!strchr((const char*)PL_simple,OP(nxt))
3141 && !(PL_regkind[OP(nxt)] == EXACT
3142 && STR_LEN(nxt) == 1))
3148 if (OP(nxt) != CLOSE)
3150 if (RExC_open_parens) {
3151 RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
3152 RExC_close_parens[ARG(nxt1)-1]=nxt+2; /*close->while*/
3154 /* Now we know that nxt2 is the only contents: */
3155 oscan->flags = (U8)ARG(nxt);
3157 OP(nxt1) = NOTHING; /* was OPEN. */
3160 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
3161 NEXT_OFF(nxt1+ 1) = 0; /* just for consistancy. */
3162 NEXT_OFF(nxt2) = 0; /* just for consistancy with CURLY. */
3163 OP(nxt) = OPTIMIZED; /* was CLOSE. */
3164 OP(nxt + 1) = OPTIMIZED; /* was count. */
3165 NEXT_OFF(nxt+ 1) = 0; /* just for consistancy. */
3170 /* Try optimization CURLYX => CURLYM. */
3171 if ( OP(oscan) == CURLYX && data
3172 && !(data->flags & SF_HAS_PAR)
3173 && !(data->flags & SF_HAS_EVAL)
3174 && !deltanext /* atom is fixed width */
3175 && minnext != 0 /* CURLYM can't handle zero width */
3177 /* XXXX How to optimize if data == 0? */
3178 /* Optimize to a simpler form. */
3179 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN */
3183 while ( (nxt2 = regnext(nxt)) /* skip over embedded stuff*/
3184 && (OP(nxt2) != WHILEM))
3186 OP(nxt2) = SUCCEED; /* Whas WHILEM */
3187 /* Need to optimize away parenths. */
3188 if (data->flags & SF_IN_PAR) {
3189 /* Set the parenth number. */
3190 regnode *nxt1 = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN*/
3192 if (OP(nxt) != CLOSE)
3193 FAIL("Panic opt close");
3194 oscan->flags = (U8)ARG(nxt);
3195 if (RExC_open_parens) {
3196 RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
3197 RExC_close_parens[ARG(nxt1)-1]=nxt2+1; /*close->NOTHING*/
3199 OP(nxt1) = OPTIMIZED; /* was OPEN. */
3200 OP(nxt) = OPTIMIZED; /* was CLOSE. */
3203 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
3204 OP(nxt + 1) = OPTIMIZED; /* was count. */
3205 NEXT_OFF(nxt1 + 1) = 0; /* just for consistancy. */
3206 NEXT_OFF(nxt + 1) = 0; /* just for consistancy. */
3209 while ( nxt1 && (OP(nxt1) != WHILEM)) {
3210 regnode *nnxt = regnext(nxt1);
3213 if (reg_off_by_arg[OP(nxt1)])
3214 ARG_SET(nxt1, nxt2 - nxt1);
3215 else if (nxt2 - nxt1 < U16_MAX)
3216 NEXT_OFF(nxt1) = nxt2 - nxt1;
3218 OP(nxt) = NOTHING; /* Cannot beautify */
3223 /* Optimize again: */
3224 study_chunk(pRExC_state, &nxt1, minlenp, &deltanext, nxt,
3225 NULL, stopparen, recursed, NULL, 0,depth+1);
3230 else if ((OP(oscan) == CURLYX)
3231 && (flags & SCF_WHILEM_VISITED_POS)
3232 /* See the comment on a similar expression above.
3233 However, this time it not a subexpression
3234 we care about, but the expression itself. */
3235 && (maxcount == REG_INFTY)
3236 && data && ++data->whilem_c < 16) {
3237 /* This stays as CURLYX, we can put the count/of pair. */
3238 /* Find WHILEM (as in regexec.c) */
3239 regnode *nxt = oscan + NEXT_OFF(oscan);
3241 if (OP(PREVOPER(nxt)) == NOTHING) /* LONGJMP */
3243 PREVOPER(nxt)->flags = (U8)(data->whilem_c
3244 | (RExC_whilem_seen << 4)); /* On WHILEM */
3246 if (data && fl & (SF_HAS_PAR|SF_IN_PAR))
3248 if (flags & SCF_DO_SUBSTR) {
3249 SV *last_str = NULL;
3250 int counted = mincount != 0;
3252 if (data->last_end > 0 && mincount != 0) { /* Ends with a string. */
3253 #if defined(SPARC64_GCC_WORKAROUND)
3256 const char *s = NULL;
3259 if (pos_before >= data->last_start_min)
3262 b = data->last_start_min;
3265 s = SvPV_const(data->last_found, l);
3266 old = b - data->last_start_min;
3269 I32 b = pos_before >= data->last_start_min
3270 ? pos_before : data->last_start_min;
3272 const char * const s = SvPV_const(data->last_found, l);
3273 I32 old = b - data->last_start_min;
3277 old = utf8_hop((U8*)s, old) - (U8*)s;
3280 /* Get the added string: */
3281 last_str = newSVpvn(s + old, l);
3283 SvUTF8_on(last_str);
3284 if (deltanext == 0 && pos_before == b) {
3285 /* What was added is a constant string */
3287 SvGROW(last_str, (mincount * l) + 1);
3288 repeatcpy(SvPVX(last_str) + l,
3289 SvPVX_const(last_str), l, mincount - 1);
3290 SvCUR_set(last_str, SvCUR(last_str) * mincount);
3291 /* Add additional parts. */
3292 SvCUR_set(data->last_found,
3293 SvCUR(data->last_found) - l);
3294 sv_catsv(data->last_found, last_str);
3296 SV * sv = data->last_found;
3298 SvUTF8(sv) && SvMAGICAL(sv) ?
3299 mg_find(sv, PERL_MAGIC_utf8) : NULL;
3300 if (mg && mg->mg_len >= 0)
3301 mg->mg_len += CHR_SVLEN(last_str);
3303 data->last_end += l * (mincount - 1);
3306 /* start offset must point into the last copy */
3307 data->last_start_min += minnext * (mincount - 1);
3308 data->last_start_max += is_inf ? I32_MAX
3309 : (maxcount - 1) * (minnext + data->pos_delta);
3312 /* It is counted once already... */
3313 data->pos_min += minnext * (mincount - counted);
3314 data->pos_delta += - counted * deltanext +
3315 (minnext + deltanext) * maxcount - minnext * mincount;
3316 if (mincount != maxcount) {
3317 /* Cannot extend fixed substrings found inside
3319 SCAN_COMMIT(pRExC_state,data,minlenp);
3320 if (mincount && last_str) {
3321 SV * const sv = data->last_found;
3322 MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
3323 mg_find(sv, PERL_MAGIC_utf8) : NULL;
3327 sv_setsv(sv, last_str);
3328 data->last_end = data->pos_min;
3329 data->last_start_min =
3330 data->pos_min - CHR_SVLEN(last_str);
3331 data->last_start_max = is_inf
3333 : data->pos_min + data->pos_delta
3334 - CHR_SVLEN(last_str);
3336 data->longest = &(data->longest_float);
3338 SvREFCNT_dec(last_str);
3340 if (data && (fl & SF_HAS_EVAL))
3341 data->flags |= SF_HAS_EVAL;
3342 optimize_curly_tail:
3343 if (OP(oscan) != CURLYX) {
3344 while (PL_regkind[OP(next = regnext(oscan))] == NOTHING
3346 NEXT_OFF(oscan) += NEXT_OFF(next);
3349 default: /* REF and CLUMP only? */
3350 if (flags & SCF_DO_SUBSTR) {
3351 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3352 data->longest = &(data->longest_float);
3354 is_inf = is_inf_internal = 1;
3355 if (flags & SCF_DO_STCLASS_OR)
3356 cl_anything(pRExC_state, data->start_class);
3357 flags &= ~SCF_DO_STCLASS;
3361 else if (OP(scan) == LNBREAK) {
3362 if (flags & SCF_DO_STCLASS) {
3364 data->start_class->flags &= ~ANYOF_EOS; /* No match on empty */
3365 if (flags & SCF_DO_STCLASS_AND) {
3366 for (value = 0; value < 256; value++)
3367 if (!is_VERTWS_cp(value))
3368 ANYOF_BITMAP_CLEAR(data->start_class, value);
3371 for (value = 0; value < 256; value++)
3372 if (is_VERTWS_cp(value))
3373 ANYOF_BITMAP_SET(data->start_class, value);
3375 if (flags & SCF_DO_STCLASS_OR)
3376 cl_and(data->start_class, and_withp);
3377 flags &= ~SCF_DO_STCLASS;
3381 if (flags & SCF_DO_SUBSTR) {
3382 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3384 data->pos_delta += 1;
3385 data->longest = &(data->longest_float);
3389 else if (OP(scan) == FOLDCHAR) {
3390 int d = ARG(scan)==0xDF ? 1 : 2;
3391 flags &= ~SCF_DO_STCLASS;
3394 if (flags & SCF_DO_SUBSTR) {
3395 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3397 data->pos_delta += d;
3398 data->longest = &(data->longest_float);
3401 else if (strchr((const char*)PL_simple,OP(scan))) {
3404 if (flags & SCF_DO_SUBSTR) {
3405 SCAN_COMMIT(pRExC_state,data,minlenp);
3409 if (flags & SCF_DO_STCLASS) {
3410 data->start_class->flags &= ~ANYOF_EOS; /* No match on empty */
3412 /* Some of the logic below assumes that switching
3413 locale on will only add false positives. */
3414 switch (PL_regkind[OP(scan)]) {
3418 /* Perl_croak(aTHX_ "panic: unexpected simple REx opcode %d", OP(scan)); */
3419 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
3420 cl_anything(pRExC_state, data->start_class);
3423 if (OP(scan) == SANY)
3425 if (flags & SCF_DO_STCLASS_OR) { /* Everything but \n */
3426 value = (ANYOF_BITMAP_TEST(data->start_class,'\n')
3427 || (data->start_class->flags & ANYOF_CLASS));
3428 cl_anything(pRExC_state, data->start_class);
3430 if (flags & SCF_DO_STCLASS_AND || !value)
3431 ANYOF_BITMAP_CLEAR(data->start_class,'\n');
3434 if (flags & SCF_DO_STCLASS_AND)
3435 cl_and(data->start_class,
3436 (struct regnode_charclass_class*)scan);
3438 cl_or(pRExC_state, data->start_class,
3439 (struct regnode_charclass_class*)scan);
3442 if (flags & SCF_DO_STCLASS_AND) {
3443 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3444 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NALNUM);
3445 for (value = 0; value < 256; value++)
3446 if (!isALNUM(value))
3447 ANYOF_BITMAP_CLEAR(data->start_class, value);
3451 if (data->start_class->flags & ANYOF_LOCALE)
3452 ANYOF_CLASS_SET(data->start_class,ANYOF_ALNUM);
3454 for (value = 0; value < 256; value++)
3456 ANYOF_BITMAP_SET(data->start_class, value);
3461 if (flags & SCF_DO_STCLASS_AND) {
3462 if (data->start_class->flags & ANYOF_LOCALE)
3463 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NALNUM);
3466 ANYOF_CLASS_SET(data->start_class,ANYOF_ALNUM);
3467 data->start_class->flags |= ANYOF_LOCALE;
3471 if (flags & SCF_DO_STCLASS_AND) {
3472 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3473 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_ALNUM);
3474 for (value = 0; value < 256; value++)
3476 ANYOF_BITMAP_CLEAR(data->start_class, value);
3480 if (data->start_class->flags & ANYOF_LOCALE)
3481 ANYOF_CLASS_SET(data->start_class,ANYOF_NALNUM);
3483 for (value = 0; value < 256; value++)
3484 if (!isALNUM(value))
3485 ANYOF_BITMAP_SET(data->start_class, value);
3490 if (flags & SCF_DO_STCLASS_AND) {
3491 if (data->start_class->flags & ANYOF_LOCALE)
3492 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_ALNUM);
3495 data->start_class->flags |= ANYOF_LOCALE;
3496 ANYOF_CLASS_SET(data->start_class,ANYOF_NALNUM);
3500 if (flags & SCF_DO_STCLASS_AND) {
3501 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3502 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NSPACE);
3503 for (value = 0; value < 256; value++)
3504 if (!isSPACE(value))
3505 ANYOF_BITMAP_CLEAR(data->start_class, value);
3509 if (data->start_class->flags & ANYOF_LOCALE)
3510 ANYOF_CLASS_SET(data->start_class,ANYOF_SPACE);
3512 for (value = 0; value < 256; value++)
3514 ANYOF_BITMAP_SET(data->start_class, value);
3519 if (flags & SCF_DO_STCLASS_AND) {
3520 if (data->start_class->flags & ANYOF_LOCALE)
3521 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NSPACE);
3524 data->start_class->flags |= ANYOF_LOCALE;
3525 ANYOF_CLASS_SET(data->start_class,ANYOF_SPACE);
3529 if (flags & SCF_DO_STCLASS_AND) {
3530 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3531 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_SPACE);
3532 for (value = 0; value < 256; value++)
3534 ANYOF_BITMAP_CLEAR(data->start_class, value);
3538 if (data->start_class->flags & ANYOF_LOCALE)
3539 ANYOF_CLASS_SET(data->start_class,ANYOF_NSPACE);
3541 for (value = 0; value < 256; value++)
3542 if (!isSPACE(value))
3543 ANYOF_BITMAP_SET(data->start_class, value);
3548 if (flags & SCF_DO_STCLASS_AND) {
3549 if (data->start_class->flags & ANYOF_LOCALE) {
3550 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_SPACE);
3551 for (value = 0; value < 256; value++)
3552 if (!isSPACE(value))
3553 ANYOF_BITMAP_CLEAR(data->start_class, value);
3557 data->start_class->flags |= ANYOF_LOCALE;
3558 ANYOF_CLASS_SET(data->start_class,ANYOF_NSPACE);
3562 if (flags & SCF_DO_STCLASS_AND) {
3563 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NDIGIT);
3564 for (value = 0; value < 256; value++)
3565 if (!isDIGIT(value))
3566 ANYOF_BITMAP_CLEAR(data->start_class, value);
3569 if (data->start_class->flags & ANYOF_LOCALE)
3570 ANYOF_CLASS_SET(data->start_class,ANYOF_DIGIT);
3572 for (value = 0; value < 256; value++)
3574 ANYOF_BITMAP_SET(data->start_class, value);
3579 if (flags & SCF_DO_STCLASS_AND) {
3580 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_DIGIT);
3581 for (value = 0; value < 256; value++)
3583 ANYOF_BITMAP_CLEAR(data->start_class, value);
3586 if (data->start_class->flags & ANYOF_LOCALE)
3587 ANYOF_CLASS_SET(data->start_class,ANYOF_NDIGIT);
3589 for (value = 0; value < 256; value++)
3590 if (!isDIGIT(value))
3591 ANYOF_BITMAP_SET(data->start_class, value);
3595 CASE_SYNST_FNC(VERTWS);
3596 CASE_SYNST_FNC(HORIZWS);
3599 if (flags & SCF_DO_STCLASS_OR)
3600 cl_and(data->start_class, and_withp);
3601 flags &= ~SCF_DO_STCLASS;
3604 else if (PL_regkind[OP(scan)] == EOL && flags & SCF_DO_SUBSTR) {
3605 data->flags |= (OP(scan) == MEOL
3609 else if ( PL_regkind[OP(scan)] == BRANCHJ
3610 /* Lookbehind, or need to calculate parens/evals/stclass: */
3611 && (scan->flags || data || (flags & SCF_DO_STCLASS))
3612 && (OP(scan) == IFMATCH || OP(scan) == UNLESSM)) {
3613 if ( !PERL_ENABLE_POSITIVE_ASSERTION_STUDY
3614 || OP(scan) == UNLESSM )
3616 /* Negative Lookahead/lookbehind
3617 In this case we can't do fixed string optimisation.
3620 I32 deltanext, minnext, fake = 0;
3622 struct regnode_charclass_class intrnl;
3625 data_fake.flags = 0;
3627 data_fake.whilem_c = data->whilem_c;
3628 data_fake.last_closep = data->last_closep;
3631 data_fake.last_closep = &fake;
3632 data_fake.pos_delta = delta;
3633 if ( flags & SCF_DO_STCLASS && !scan->flags
3634 && OP(scan) == IFMATCH ) { /* Lookahead */
3635 cl_init(pRExC_state, &intrnl);
3636 data_fake.start_class = &intrnl;
3637 f |= SCF_DO_STCLASS_AND;
3639 if (flags & SCF_WHILEM_VISITED_POS)
3640 f |= SCF_WHILEM_VISITED_POS;
3641 next = regnext(scan);
3642 nscan = NEXTOPER(NEXTOPER(scan));
3643 minnext = study_chunk(pRExC_state, &nscan, minlenp, &deltanext,
3644 last, &data_fake, stopparen, recursed, NULL, f, depth+1);
3647 FAIL("Variable length lookbehind not implemented");
3649 else if (minnext > (I32)U8_MAX) {
3650 FAIL2("Lookbehind longer than %"UVuf" not implemented", (UV)U8_MAX);
3652 scan->flags = (U8)minnext;
3655 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3657 if (data_fake.flags & SF_HAS_EVAL)
3658 data->flags |= SF_HAS_EVAL;
3659 data->whilem_c = data_fake.whilem_c;
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 PERL_ENABLE_POSITIVE_ASSERTION_STUDY
3671 /* Positive Lookahead/lookbehind
3672 In this case we can do fixed string optimisation,
3673 but we must be careful about it. Note in the case of
3674 lookbehind the positions will be offset by the minimum
3675 length of the pattern, something we won't know about
3676 until after the recurse.
3678 I32 deltanext, fake = 0;
3680 struct regnode_charclass_class intrnl;
3682 /* We use SAVEFREEPV so that when the full compile
3683 is finished perl will clean up the allocated
3684 minlens when its all done. This was we don't
3685 have to worry about freeing them when we know
3686 they wont be used, which would be a pain.
3689 Newx( minnextp, 1, I32 );
3690 SAVEFREEPV(minnextp);
3693 StructCopy(data, &data_fake, scan_data_t);
3694 if ((flags & SCF_DO_SUBSTR) && data->last_found) {
3697 SCAN_COMMIT(pRExC_state, &data_fake,minlenp);
3698 data_fake.last_found=newSVsv(data->last_found);
3702 data_fake.last_closep = &fake;
3703 data_fake.flags = 0;
3704 data_fake.pos_delta = delta;
3706 data_fake.flags |= SF_IS_INF;
3707 if ( flags & SCF_DO_STCLASS && !scan->flags
3708 && OP(scan) == IFMATCH ) { /* Lookahead */
3709 cl_init(pRExC_state, &intrnl);
3710 data_fake.start_class = &intrnl;
3711 f |= SCF_DO_STCLASS_AND;
3713 if (flags & SCF_WHILEM_VISITED_POS)
3714 f |= SCF_WHILEM_VISITED_POS;
3715 next = regnext(scan);
3716 nscan = NEXTOPER(NEXTOPER(scan));
3718 *minnextp = study_chunk(pRExC_state, &nscan, minnextp, &deltanext,
3719 last, &data_fake, stopparen, recursed, NULL, f,depth+1);
3722 FAIL("Variable length lookbehind not implemented");
3724 else if (*minnextp > (I32)U8_MAX) {
3725 FAIL2("Lookbehind longer than %"UVuf" not implemented", (UV)U8_MAX);
3727 scan->flags = (U8)*minnextp;
3732 if (f & SCF_DO_STCLASS_AND) {
3733 const int was = (data->start_class->flags & ANYOF_EOS);
3735 cl_and(data->start_class, &intrnl);
3737 data->start_class->flags |= ANYOF_EOS;
3740 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3742 if (data_fake.flags & SF_HAS_EVAL)
3743 data->flags |= SF_HAS_EVAL;
3744 data->whilem_c = data_fake.whilem_c;
3745 if ((flags & SCF_DO_SUBSTR) && data_fake.last_found) {
3746 if (RExC_rx->minlen<*minnextp)
3747 RExC_rx->minlen=*minnextp;
3748 SCAN_COMMIT(pRExC_state, &data_fake, minnextp);
3749 SvREFCNT_dec(data_fake.last_found);
3751 if ( data_fake.minlen_fixed != minlenp )
3753 data->offset_fixed= data_fake.offset_fixed;
3754 data->minlen_fixed= data_fake.minlen_fixed;
3755 data->lookbehind_fixed+= scan->flags;
3757 if ( data_fake.minlen_float != minlenp )
3759 data->minlen_float= data_fake.minlen_float;
3760 data->offset_float_min=data_fake.offset_float_min;
3761 data->offset_float_max=data_fake.offset_float_max;
3762 data->lookbehind_float+= scan->flags;
3771 else if (OP(scan) == OPEN) {
3772 if (stopparen != (I32)ARG(scan))
3775 else if (OP(scan) == CLOSE) {
3776 if (stopparen == (I32)ARG(scan)) {
3779 if ((I32)ARG(scan) == is_par) {
3780 next = regnext(scan);
3782 if ( next && (OP(next) != WHILEM) && next < last)
3783 is_par = 0; /* Disable optimization */
3786 *(data->last_closep) = ARG(scan);
3788 else if (OP(scan) == EVAL) {
3790 data->flags |= SF_HAS_EVAL;
3792 else if ( PL_regkind[OP(scan)] == ENDLIKE ) {
3793 if (flags & SCF_DO_SUBSTR) {
3794 SCAN_COMMIT(pRExC_state,data,minlenp);
3795 flags &= ~SCF_DO_SUBSTR;
3797 if (data && OP(scan)==ACCEPT) {
3798 data->flags |= SCF_SEEN_ACCEPT;
3803 else if (OP(scan) == LOGICAL && scan->flags == 2) /* Embedded follows */
3805 if (flags & SCF_DO_SUBSTR) {
3806 SCAN_COMMIT(pRExC_state,data,minlenp);
3807 data->longest = &(data->longest_float);
3809 is_inf = is_inf_internal = 1;
3810 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
3811 cl_anything(pRExC_state, data->start_class);
3812 flags &= ~SCF_DO_STCLASS;
3814 else if (OP(scan) == GPOS) {
3815 if (!(RExC_rx->extflags & RXf_GPOS_FLOAT) &&
3816 !(delta || is_inf || (data && data->pos_delta)))
3818 if (!(RExC_rx->extflags & RXf_ANCH) && (flags & SCF_DO_SUBSTR))
3819 RExC_rx->extflags |= RXf_ANCH_GPOS;
3820 if (RExC_rx->gofs < (U32)min)
3821 RExC_rx->gofs = min;
3823 RExC_rx->extflags |= RXf_GPOS_FLOAT;
3827 #ifdef TRIE_STUDY_OPT
3828 #ifdef FULL_TRIE_STUDY
3829 else if (PL_regkind[OP(scan)] == TRIE) {
3830 /* NOTE - There is similar code to this block above for handling
3831 BRANCH nodes on the initial study. If you change stuff here
3833 regnode *trie_node= scan;
3834 regnode *tail= regnext(scan);
3835 reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
3836 I32 max1 = 0, min1 = I32_MAX;
3837 struct regnode_charclass_class accum;
3839 if (flags & SCF_DO_SUBSTR) /* XXXX Add !SUSPEND? */
3840 SCAN_COMMIT(pRExC_state, data,minlenp); /* Cannot merge strings after this. */
3841 if (flags & SCF_DO_STCLASS)
3842 cl_init_zero(pRExC_state, &accum);
3848 const regnode *nextbranch= NULL;
3851 for ( word=1 ; word <= trie->wordcount ; word++)
3853 I32 deltanext=0, minnext=0, f = 0, fake;
3854 struct regnode_charclass_class this_class;
3856 data_fake.flags = 0;
3858 data_fake.whilem_c = data->whilem_c;
3859 data_fake.last_closep = data->last_closep;
3862 data_fake.last_closep = &fake;
3863 data_fake.pos_delta = delta;
3864 if (flags & SCF_DO_STCLASS) {
3865 cl_init(pRExC_state, &this_class);
3866 data_fake.start_class = &this_class;
3867 f = SCF_DO_STCLASS_AND;
3869 if (flags & SCF_WHILEM_VISITED_POS)
3870 f |= SCF_WHILEM_VISITED_POS;
3872 if (trie->jump[word]) {
3874 nextbranch = trie_node + trie->jump[0];
3875 scan= trie_node + trie->jump[word];
3876 /* We go from the jump point to the branch that follows
3877 it. Note this means we need the vestigal unused branches
3878 even though they arent otherwise used.
3880 minnext = study_chunk(pRExC_state, &scan, minlenp,
3881 &deltanext, (regnode *)nextbranch, &data_fake,
3882 stopparen, recursed, NULL, f,depth+1);
3884 if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
3885 nextbranch= regnext((regnode*)nextbranch);
3887 if (min1 > (I32)(minnext + trie->minlen))
3888 min1 = minnext + trie->minlen;
3889 if (max1 < (I32)(minnext + deltanext + trie->maxlen))
3890 max1 = minnext + deltanext + trie->maxlen;
3891 if (deltanext == I32_MAX)
3892 is_inf = is_inf_internal = 1;
3894 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3896 if (data_fake.flags & SCF_SEEN_ACCEPT) {
3897 if ( stopmin > min + min1)
3898 stopmin = min + min1;
3899 flags &= ~SCF_DO_SUBSTR;
3901 data->flags |= SCF_SEEN_ACCEPT;
3904 if (data_fake.flags & SF_HAS_EVAL)
3905 data->flags |= SF_HAS_EVAL;
3906 data->whilem_c = data_fake.whilem_c;
3908 if (flags & SCF_DO_STCLASS)
3909 cl_or(pRExC_state, &accum, &this_class);
3912 if (flags & SCF_DO_SUBSTR) {
3913 data->pos_min += min1;
3914 data->pos_delta += max1 - min1;
3915 if (max1 != min1 || is_inf)
3916 data->longest = &(data->longest_float);
3919 delta += max1 - min1;
3920 if (flags & SCF_DO_STCLASS_OR) {
3921 cl_or(pRExC_state, data->start_class, &accum);
3923 cl_and(data->start_class, and_withp);
3924 flags &= ~SCF_DO_STCLASS;
3927 else if (flags & SCF_DO_STCLASS_AND) {
3929 cl_and(data->start_class, &accum);
3930 flags &= ~SCF_DO_STCLASS;
3933 /* Switch to OR mode: cache the old value of
3934 * data->start_class */
3936 StructCopy(data->start_class, and_withp,
3937 struct regnode_charclass_class);
3938 flags &= ~SCF_DO_STCLASS_AND;
3939 StructCopy(&accum, data->start_class,
3940 struct regnode_charclass_class);
3941 flags |= SCF_DO_STCLASS_OR;
3942 data->start_class->flags |= ANYOF_EOS;
3949 else if (PL_regkind[OP(scan)] == TRIE) {
3950 reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
3953 min += trie->minlen;
3954 delta += (trie->maxlen - trie->minlen);
3955 flags &= ~SCF_DO_STCLASS; /* xxx */
3956 if (flags & SCF_DO_SUBSTR) {
3957 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3958 data->pos_min += trie->minlen;
3959 data->pos_delta += (trie->maxlen - trie->minlen);
3960 if (trie->maxlen != trie->minlen)
3961 data->longest = &(data->longest_float);
3963 if (trie->jump) /* no more substrings -- for now /grr*/
3964 flags &= ~SCF_DO_SUBSTR;
3966 #endif /* old or new */
3967 #endif /* TRIE_STUDY_OPT */
3969 /* Else: zero-length, ignore. */
3970 scan = regnext(scan);
3975 stopparen = frame->stop;
3976 frame = frame->prev;
3977 goto fake_study_recurse;
3982 DEBUG_STUDYDATA("pre-fin:",data,depth);
3985 *deltap = is_inf_internal ? I32_MAX : delta;
3986 if (flags & SCF_DO_SUBSTR && is_inf)
3987 data->pos_delta = I32_MAX - data->pos_min;
3988 if (is_par > (I32)U8_MAX)
3990 if (is_par && pars==1 && data) {
3991 data->flags |= SF_IN_PAR;
3992 data->flags &= ~SF_HAS_PAR;
3994 else if (pars && data) {
3995 data->flags |= SF_HAS_PAR;
3996 data->flags &= ~SF_IN_PAR;
3998 if (flags & SCF_DO_STCLASS_OR)
3999 cl_and(data->start_class, and_withp);
4000 if (flags & SCF_TRIE_RESTUDY)
4001 data->flags |= SCF_TRIE_RESTUDY;
4003 DEBUG_STUDYDATA("post-fin:",data,depth);
4005 return min < stopmin ? min : stopmin;
4009 S_add_data(RExC_state_t *pRExC_state, U32 n, const char *s)
4011 U32 count = RExC_rxi->data ? RExC_rxi->data->count : 0;
4013 Renewc(RExC_rxi->data,
4014 sizeof(*RExC_rxi->data) + sizeof(void*) * (count + n - 1),
4015 char, struct reg_data);
4017 Renew(RExC_rxi->data->what, count + n, U8);
4019 Newx(RExC_rxi->data->what, n, U8);
4020 RExC_rxi->data->count = count + n;
4021 Copy(s, RExC_rxi->data->what + count, n, U8);
4025 /*XXX: todo make this not included in a non debugging perl */
4026 #ifndef PERL_IN_XSUB_RE
4028 Perl_reginitcolors(pTHX)
4031 const char * const s = PerlEnv_getenv("PERL_RE_COLORS");
4033 char *t = savepv(s);
4037 t = strchr(t, '\t');
4043 PL_colors[i] = t = (char *)"";
4048 PL_colors[i++] = (char *)"";
4055 #ifdef TRIE_STUDY_OPT
4056 #define CHECK_RESTUDY_GOTO \
4058 (data.flags & SCF_TRIE_RESTUDY) \
4062 #define CHECK_RESTUDY_GOTO
4066 - pregcomp - compile a regular expression into internal code
4068 * We can't allocate space until we know how big the compiled form will be,
4069 * but we can't compile it (and thus know how big it is) until we've got a
4070 * place to put the code. So we cheat: we compile it twice, once with code
4071 * generation turned off and size counting turned on, and once "for real".
4072 * This also means that we don't allocate space until we are sure that the
4073 * thing really will compile successfully, and we never have to move the
4074 * code and thus invalidate pointers into it. (Note that it has to be in
4075 * one piece because free() must be able to free it all.) [NB: not true in perl]
4077 * Beware that the optimization-preparation code in here knows about some
4078 * of the structure of the compiled regexp. [I'll say.]
4083 #ifndef PERL_IN_XSUB_RE
4084 #define RE_ENGINE_PTR &PL_core_reg_engine
4086 extern const struct regexp_engine my_reg_engine;
4087 #define RE_ENGINE_PTR &my_reg_engine
4090 #ifndef PERL_IN_XSUB_RE
4092 Perl_pregcomp(pTHX_ const SV * const pattern, const U32 flags)
4095 HV * const table = GvHV(PL_hintgv);
4096 /* Dispatch a request to compile a regexp to correct
4099 SV **ptr= hv_fetchs(table, "regcomp", FALSE);
4100 GET_RE_DEBUG_FLAGS_DECL;
4101 if (ptr && SvIOK(*ptr) && SvIV(*ptr)) {
4102 const regexp_engine *eng=INT2PTR(regexp_engine*,SvIV(*ptr));
4104 PerlIO_printf(Perl_debug_log, "Using engine %"UVxf"\n",
4107 return CALLREGCOMP_ENG(eng, pattern, flags);
4110 return Perl_re_compile(aTHX_ pattern, flags);
4115 Perl_re_compile(pTHX_ const SV * const pattern, const U32 pm_flags)
4119 register regexp_internal *ri;
4121 char* exp = SvPV((SV*)pattern, plen);
4122 char* xend = exp + plen;
4130 RExC_state_t RExC_state;
4131 RExC_state_t * const pRExC_state = &RExC_state;
4132 #ifdef TRIE_STUDY_OPT
4134 RExC_state_t copyRExC_state;
4136 GET_RE_DEBUG_FLAGS_DECL;
4137 DEBUG_r(if (!PL_colorset) reginitcolors());
4139 RExC_utf8 = RExC_orig_utf8 = pm_flags & RXf_UTF8;
4142 SV *dsv= sv_newmortal();
4143 RE_PV_QUOTED_DECL(s, RExC_utf8,
4144 dsv, exp, plen, 60);
4145 PerlIO_printf(Perl_debug_log, "%sCompiling REx%s %s\n",
4146 PL_colors[4],PL_colors[5],s);
4151 RExC_flags = pm_flags;
4155 RExC_seen_zerolen = *exp == '^' ? -1 : 0;
4156 RExC_seen_evals = 0;
4159 /* First pass: determine size, legality. */
4167 RExC_emit = &PL_regdummy;
4168 RExC_whilem_seen = 0;
4169 RExC_charnames = NULL;
4170 RExC_open_parens = NULL;
4171 RExC_close_parens = NULL;
4173 RExC_paren_names = NULL;
4175 RExC_paren_name_list = NULL;
4177 RExC_recurse = NULL;
4178 RExC_recurse_count = 0;
4180 #if 0 /* REGC() is (currently) a NOP at the first pass.
4181 * Clever compilers notice this and complain. --jhi */
4182 REGC((U8)REG_MAGIC, (char*)RExC_emit);
4184 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log, "Starting first pass (sizing)\n"));
4185 if (reg(pRExC_state, 0, &flags,1) == NULL) {
4186 RExC_precomp = NULL;
4189 if (RExC_utf8 && !RExC_orig_utf8) {
4190 /* It's possible to write a regexp in ascii that represents unicode
4191 codepoints outside of the byte range, such as via \x{100}. If we
4192 detect such a sequence we have to convert the entire pattern to utf8
4193 and then recompile, as our sizing calculation will have been based
4194 on 1 byte == 1 character, but we will need to use utf8 to encode
4195 at least some part of the pattern, and therefore must convert the whole
4197 XXX: somehow figure out how to make this less expensive...
4200 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log,
4201 "UTF8 mismatch! Converting to utf8 for resizing and compile\n"));
4202 exp = (char*)Perl_bytes_to_utf8(aTHX_ (U8*)exp, &len);
4204 RExC_orig_utf8 = RExC_utf8;
4206 goto redo_first_pass;
4209 PerlIO_printf(Perl_debug_log,
4210 "Required size %"IVdf" nodes\n"
4211 "Starting second pass (creation)\n",
4214 RExC_lastparse=NULL;
4216 /* Small enough for pointer-storage convention?
4217 If extralen==0, this means that we will not need long jumps. */
4218 if (RExC_size >= 0x10000L && RExC_extralen)
4219 RExC_size += RExC_extralen;
4222 if (RExC_whilem_seen > 15)
4223 RExC_whilem_seen = 15;
4225 /* Allocate space and zero-initialize. Note, the two step process
4226 of zeroing when in debug mode, thus anything assigned has to
4227 happen after that */
4228 Newxz(r, 1, regexp);
4229 Newxc(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode),
4230 char, regexp_internal);
4231 if ( r == NULL || ri == NULL )
4232 FAIL("Regexp out of space");
4234 /* avoid reading uninitialized memory in DEBUGGING code in study_chunk() */
4235 Zero(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode), char);
4237 /* bulk initialize base fields with 0. */
4238 Zero(ri, sizeof(regexp_internal), char);
4241 /* non-zero initialization begins here */
4243 r->engine= RE_ENGINE_PTR;
4246 r->extflags = pm_flags;
4248 bool has_k = ((r->extflags & RXf_PMf_KEEPCOPY) == RXf_PMf_KEEPCOPY);
4249 bool has_minus = ((r->extflags & RXf_PMf_STD_PMMOD) != RXf_PMf_STD_PMMOD);
4250 bool has_runon = ((RExC_seen & REG_SEEN_RUN_ON_COMMENT)==REG_SEEN_RUN_ON_COMMENT);
4251 U16 reganch = (U16)((r->extflags & RXf_PMf_STD_PMMOD) >> 12);
4252 const char *fptr = STD_PAT_MODS; /*"msix"*/
4254 r->wraplen = r->prelen + has_minus + has_k + has_runon
4255 + (sizeof(STD_PAT_MODS) - 1)
4256 + (sizeof("(?:)") - 1);
4258 Newx(r->wrapped, r->wraplen + 1, char );
4262 *p++ = KEEPCOPY_PAT_MOD; /*'k'*/
4264 char *r = p + (sizeof(STD_PAT_MODS) - 1) + has_minus - 1;
4265 char *colon = r + 1;
4268 while((ch = *fptr++)) {
4282 Copy(RExC_precomp, p, r->prelen, char);
4292 r->nparens = RExC_npar - 1; /* set early to validate backrefs */
4294 if (RExC_seen & REG_SEEN_RECURSE) {
4295 Newxz(RExC_open_parens, RExC_npar,regnode *);
4296 SAVEFREEPV(RExC_open_parens);
4297 Newxz(RExC_close_parens,RExC_npar,regnode *);
4298 SAVEFREEPV(RExC_close_parens);
4301 /* Useful during FAIL. */
4302 #ifdef RE_TRACK_PATTERN_OFFSETS
4303 Newxz(ri->u.offsets, 2*RExC_size+1, U32); /* MJD 20001228 */
4304 DEBUG_OFFSETS_r(PerlIO_printf(Perl_debug_log,
4305 "%s %"UVuf" bytes for offset annotations.\n",
4306 ri->u.offsets ? "Got" : "Couldn't get",
4307 (UV)((2*RExC_size+1) * sizeof(U32))));
4309 SetProgLen(ri,RExC_size);
4313 /* Second pass: emit code. */
4314 RExC_flags = pm_flags; /* don't let top level (?i) bleed */
4319 RExC_emit_start = ri->program;
4320 RExC_emit = ri->program;
4321 RExC_emit_bound = ri->program + RExC_size + 1;
4323 /* Store the count of eval-groups for security checks: */
4324 RExC_rx->seen_evals = RExC_seen_evals;
4325 REGC((U8)REG_MAGIC, (char*) RExC_emit++);
4326 if (reg(pRExC_state, 0, &flags,1) == NULL)
4329 /* XXXX To minimize changes to RE engine we always allocate
4330 3-units-long substrs field. */
4331 Newx(r->substrs, 1, struct reg_substr_data);
4332 if (RExC_recurse_count) {
4333 Newxz(RExC_recurse,RExC_recurse_count,regnode *);
4334 SAVEFREEPV(RExC_recurse);
4338 r->minlen = minlen = sawplus = sawopen = 0;
4339 Zero(r->substrs, 1, struct reg_substr_data);
4341 #ifdef TRIE_STUDY_OPT
4344 DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log,"Restudying\n"));
4346 RExC_state = copyRExC_state;
4347 if (seen & REG_TOP_LEVEL_BRANCHES)
4348 RExC_seen |= REG_TOP_LEVEL_BRANCHES;
4350 RExC_seen &= ~REG_TOP_LEVEL_BRANCHES;
4351 if (data.last_found) {
4352 SvREFCNT_dec(data.longest_fixed);
4353 SvREFCNT_dec(data.longest_float);
4354 SvREFCNT_dec(data.last_found);
4356 StructCopy(&zero_scan_data, &data, scan_data_t);
4358 StructCopy(&zero_scan_data, &data, scan_data_t);
4359 copyRExC_state = RExC_state;
4362 StructCopy(&zero_scan_data, &data, scan_data_t);
4365 /* Dig out information for optimizations. */
4366 r->extflags = pm_flags; /* Again? */
4367 /*dmq: removed as part of de-PMOP: pm->op_pmflags = RExC_flags; */
4370 r->extflags |= RXf_UTF8; /* Unicode in it? */
4371 ri->regstclass = NULL;
4372 if (RExC_naughty >= 10) /* Probably an expensive pattern. */
4373 r->intflags |= PREGf_NAUGHTY;
4374 scan = ri->program + 1; /* First BRANCH. */
4376 /* testing for BRANCH here tells us whether there is "must appear"
4377 data in the pattern. If there is then we can use it for optimisations */
4378 if (!(RExC_seen & REG_TOP_LEVEL_BRANCHES)) { /* Only one top-level choice. */
4380 STRLEN longest_float_length, longest_fixed_length;
4381 struct regnode_charclass_class ch_class; /* pointed to by data */
4383 I32 last_close = 0; /* pointed to by data */
4386 /* Skip introductions and multiplicators >= 1. */
4387 while ((OP(first) == OPEN && (sawopen = 1)) ||
4388 /* An OR of *one* alternative - should not happen now. */
4389 (OP(first) == BRANCH && OP(regnext(first)) != BRANCH) ||
4390 /* for now we can't handle lookbehind IFMATCH*/
4391 (OP(first) == IFMATCH && !first->flags) ||
4392 (OP(first) == PLUS) ||
4393 (OP(first) == MINMOD) ||
4394 /* An {n,m} with n>0 */
4395 (PL_regkind[OP(first)] == CURLY && ARG1(first) > 0) )
4398 if (OP(first) == PLUS)
4401 first += regarglen[OP(first)];
4402 if (OP(first) == IFMATCH) {
4403 first = NEXTOPER(first);
4404 first += EXTRA_STEP_2ARGS;
4405 } else /* XXX possible optimisation for /(?=)/ */
4406 first = NEXTOPER(first);
4409 /* Starting-point info. */
4411 DEBUG_PEEP("first:",first,0);
4412 /* Ignore EXACT as we deal with it later. */
4413 if (PL_regkind[OP(first)] == EXACT) {
4414 if (OP(first) == EXACT)
4415 NOOP; /* Empty, get anchored substr later. */
4416 else if ((OP(first) == EXACTF || OP(first) == EXACTFL))
4417 ri->regstclass = first;
4420 else if (PL_regkind[OP(first)] == TRIE &&
4421 ((reg_trie_data *)ri->data->data[ ARG(first) ])->minlen>0)
4424 /* this can happen only on restudy */
4425 if ( OP(first) == TRIE ) {
4426 struct regnode_1 *trieop = (struct regnode_1 *)
4427 PerlMemShared_calloc(1, sizeof(struct regnode_1));
4428 StructCopy(first,trieop,struct regnode_1);
4429 trie_op=(regnode *)trieop;
4431 struct regnode_charclass *trieop = (struct regnode_charclass *)
4432 PerlMemShared_calloc(1, sizeof(struct regnode_charclass));
4433 StructCopy(first,trieop,struct regnode_charclass);
4434 trie_op=(regnode *)trieop;
4437 make_trie_failtable(pRExC_state, (regnode *)first, trie_op, 0);
4438 ri->regstclass = trie_op;
4441 else if (strchr((const char*)PL_simple,OP(first)))
4442 ri->regstclass = first;
4443 else if (PL_regkind[OP(first)] == BOUND ||
4444 PL_regkind[OP(first)] == NBOUND)
4445 ri->regstclass = first;
4446 else if (PL_regkind[OP(first)] == BOL) {
4447 r->extflags |= (OP(first) == MBOL
4449 : (OP(first) == SBOL
4452 first = NEXTOPER(first);
4455 else if (OP(first) == GPOS) {
4456 r->extflags |= RXf_ANCH_GPOS;
4457 first = NEXTOPER(first);
4460 else if ((!sawopen || !RExC_sawback) &&
4461 (OP(first) == STAR &&
4462 PL_regkind[OP(NEXTOPER(first))] == REG_ANY) &&
4463 !(r->extflags & RXf_ANCH) && !(RExC_seen & REG_SEEN_EVAL))
4465 /* turn .* into ^.* with an implied $*=1 */
4467 (OP(NEXTOPER(first)) == REG_ANY)
4470 r->extflags |= type;
4471 r->intflags |= PREGf_IMPLICIT;
4472 first = NEXTOPER(first);
4475 if (sawplus && (!sawopen || !RExC_sawback)
4476 && !(RExC_seen & REG_SEEN_EVAL)) /* May examine pos and $& */
4477 /* x+ must match at the 1st pos of run of x's */
4478 r->intflags |= PREGf_SKIP;
4480 /* Scan is after the zeroth branch, first is atomic matcher. */
4481 #ifdef TRIE_STUDY_OPT
4484 PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
4485 (IV)(first - scan + 1))
4489 PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
4490 (IV)(first - scan + 1))
4496 * If there's something expensive in the r.e., find the
4497 * longest literal string that must appear and make it the
4498 * regmust. Resolve ties in favor of later strings, since
4499 * the regstart check works with the beginning of the r.e.
4500 * and avoiding duplication strengthens checking. Not a
4501 * strong reason, but sufficient in the absence of others.
4502 * [Now we resolve ties in favor of the earlier string if
4503 * it happens that c_offset_min has been invalidated, since the
4504 * earlier string may buy us something the later one won't.]
4507 data.longest_fixed = newSVpvs("");
4508 data.longest_float = newSVpvs("");
4509 data.last_found = newSVpvs("");
4510 data.longest = &(data.longest_fixed);
4512 if (!ri->regstclass) {
4513 cl_init(pRExC_state, &ch_class);
4514 data.start_class = &ch_class;
4515 stclass_flag = SCF_DO_STCLASS_AND;
4516 } else /* XXXX Check for BOUND? */
4518 data.last_closep = &last_close;
4520 minlen = study_chunk(pRExC_state, &first, &minlen, &fake, scan + RExC_size, /* Up to end */
4521 &data, -1, NULL, NULL,
4522 SCF_DO_SUBSTR | SCF_WHILEM_VISITED_POS | stclass_flag,0);
4528 if ( RExC_npar == 1 && data.longest == &(data.longest_fixed)
4529 && data.last_start_min == 0 && data.last_end > 0
4530 && !RExC_seen_zerolen
4531 && !(RExC_seen & REG_SEEN_VERBARG)
4532 && (!(RExC_seen & REG_SEEN_GPOS) || (r->extflags & RXf_ANCH_GPOS)))
4533 r->extflags |= RXf_CHECK_ALL;
4534 scan_commit(pRExC_state, &data,&minlen,0);
4535 SvREFCNT_dec(data.last_found);
4537 /* Note that code very similar to this but for anchored string
4538 follows immediately below, changes may need to be made to both.
4541 longest_float_length = CHR_SVLEN(data.longest_float);
4542 if (longest_float_length
4543 || (data.flags & SF_FL_BEFORE_EOL
4544 && (!(data.flags & SF_FL_BEFORE_MEOL)
4545 || (RExC_flags & RXf_PMf_MULTILINE))))
4549 if (SvCUR(data.longest_fixed) /* ok to leave SvCUR */
4550 && data.offset_fixed == data.offset_float_min
4551 && SvCUR(data.longest_fixed) == SvCUR(data.longest_float))
4552 goto remove_float; /* As in (a)+. */
4554 /* copy the information about the longest float from the reg_scan_data
4555 over to the program. */
4556 if (SvUTF8(data.longest_float)) {
4557 r->float_utf8 = data.longest_float;
4558 r->float_substr = NULL;
4560 r->float_substr = data.longest_float;
4561 r->float_utf8 = NULL;
4563 /* float_end_shift is how many chars that must be matched that
4564 follow this item. We calculate it ahead of time as once the
4565 lookbehind offset is added in we lose the ability to correctly
4567 ml = data.minlen_float ? *(data.minlen_float)
4568 : (I32)longest_float_length;
4569 r->float_end_shift = ml - data.offset_float_min
4570 - longest_float_length + (SvTAIL(data.longest_float) != 0)
4571 + data.lookbehind_float;
4572 r->float_min_offset = data.offset_float_min - data.lookbehind_float;
4573 r->float_max_offset = data.offset_float_max;
4574 if (data.offset_float_max < I32_MAX) /* Don't offset infinity */
4575 r->float_max_offset -= data.lookbehind_float;
4577 t = (data.flags & SF_FL_BEFORE_EOL /* Can't have SEOL and MULTI */
4578 && (!(data.flags & SF_FL_BEFORE_MEOL)
4579 || (RExC_flags & RXf_PMf_MULTILINE)));
4580 fbm_compile(data.longest_float, t ? FBMcf_TAIL : 0);
4584 r->float_substr = r->float_utf8 = NULL;
4585 SvREFCNT_dec(data.longest_float);
4586 longest_float_length = 0;
4589 /* Note that code very similar to this but for floating string
4590 is immediately above, changes may need to be made to both.
4593 longest_fixed_length = CHR_SVLEN(data.longest_fixed);
4594 if (longest_fixed_length
4595 || (data.flags & SF_FIX_BEFORE_EOL /* Cannot have SEOL and MULTI */
4596 && (!(data.flags & SF_FIX_BEFORE_MEOL)
4597 || (RExC_flags & RXf_PMf_MULTILINE))))
4601 /* copy the information about the longest fixed
4602 from the reg_scan_data over to the program. */
4603 if (SvUTF8(data.longest_fixed)) {
4604 r->anchored_utf8 = data.longest_fixed;
4605 r->anchored_substr = NULL;
4607 r->anchored_substr = data.longest_fixed;
4608 r->anchored_utf8 = NULL;
4610 /* fixed_end_shift is how many chars that must be matched that
4611 follow this item. We calculate it ahead of time as once the
4612 lookbehind offset is added in we lose the ability to correctly
4614 ml = data.minlen_fixed ? *(data.minlen_fixed)
4615 : (I32)longest_fixed_length;
4616 r->anchored_end_shift = ml - data.offset_fixed
4617 - longest_fixed_length + (SvTAIL(data.longest_fixed) != 0)
4618 + data.lookbehind_fixed;
4619 r->anchored_offset = data.offset_fixed - data.lookbehind_fixed;
4621 t = (data.flags & SF_FIX_BEFORE_EOL /* Can't have SEOL and MULTI */
4622 && (!(data.flags & SF_FIX_BEFORE_MEOL)
4623 || (RExC_flags & RXf_PMf_MULTILINE)));
4624 fbm_compile(data.longest_fixed, t ? FBMcf_TAIL : 0);
4627 r->anchored_substr = r->anchored_utf8 = NULL;
4628 SvREFCNT_dec(data.longest_fixed);
4629 longest_fixed_length = 0;
4632 && (OP(ri->regstclass) == REG_ANY || OP(ri->regstclass) == SANY))
4633 ri->regstclass = NULL;
4634 if ((!(r->anchored_substr || r->anchored_utf8) || r->anchored_offset)
4636 && !(data.start_class->flags & ANYOF_EOS)
4637 && !cl_is_anything(data.start_class))
4639 const U32 n = add_data(pRExC_state, 1, "f");
4641 Newx(RExC_rxi->data->data[n], 1,
4642 struct regnode_charclass_class);
4643 StructCopy(data.start_class,
4644 (struct regnode_charclass_class*)RExC_rxi->data->data[n],
4645 struct regnode_charclass_class);
4646 ri->regstclass = (regnode*)RExC_rxi->data->data[n];
4647 r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
4648 DEBUG_COMPILE_r({ SV *sv = sv_newmortal();
4649 regprop(r, sv, (regnode*)data.start_class);
4650 PerlIO_printf(Perl_debug_log,
4651 "synthetic stclass \"%s\".\n",
4652 SvPVX_const(sv));});
4655 /* A temporary algorithm prefers floated substr to fixed one to dig more info. */
4656 if (longest_fixed_length > longest_float_length) {
4657 r->check_end_shift = r->anchored_end_shift;
4658 r->check_substr = r->anchored_substr;
4659 r->check_utf8 = r->anchored_utf8;
4660 r->check_offset_min = r->check_offset_max = r->anchored_offset;
4661 if (r->extflags & RXf_ANCH_SINGLE)
4662 r->extflags |= RXf_NOSCAN;
4665 r->check_end_shift = r->float_end_shift;
4666 r->check_substr = r->float_substr;
4667 r->check_utf8 = r->float_utf8;
4668 r->check_offset_min = r->float_min_offset;
4669 r->check_offset_max = r->float_max_offset;
4671 /* XXXX Currently intuiting is not compatible with ANCH_GPOS.
4672 This should be changed ASAP! */
4673 if ((r->check_substr || r->check_utf8) && !(r->extflags & RXf_ANCH_GPOS)) {
4674 r->extflags |= RXf_USE_INTUIT;
4675 if (SvTAIL(r->check_substr ? r->check_substr : r->check_utf8))
4676 r->extflags |= RXf_INTUIT_TAIL;
4678 /* XXX Unneeded? dmq (shouldn't as this is handled elsewhere)
4679 if ( (STRLEN)minlen < longest_float_length )
4680 minlen= longest_float_length;
4681 if ( (STRLEN)minlen < longest_fixed_length )
4682 minlen= longest_fixed_length;
4686 /* Several toplevels. Best we can is to set minlen. */
4688 struct regnode_charclass_class ch_class;
4691 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log, "\nMulti Top Level\n"));
4693 scan = ri->program + 1;
4694 cl_init(pRExC_state, &ch_class);
4695 data.start_class = &ch_class;
4696 data.last_closep = &last_close;
4699 minlen = study_chunk(pRExC_state, &scan, &minlen, &fake, scan + RExC_size,
4700 &data, -1, NULL, NULL, SCF_DO_STCLASS_AND|SCF_WHILEM_VISITED_POS,0);
4704 r->check_substr = r->check_utf8 = r->anchored_substr = r->anchored_utf8
4705 = r->float_substr = r->float_utf8 = NULL;
4706 if (!(data.start_class->flags & ANYOF_EOS)
4707 && !cl_is_anything(data.start_class))
4709 const U32 n = add_data(pRExC_state, 1, "f");
4711 Newx(RExC_rxi->data->data[n], 1,
4712 struct regnode_charclass_class);
4713 StructCopy(data.start_class,
4714 (struct regnode_charclass_class*)RExC_rxi->data->data[n],
4715 struct regnode_charclass_class);
4716 ri->regstclass = (regnode*)RExC_rxi->data->data[n];
4717 r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
4718 DEBUG_COMPILE_r({ SV* sv = sv_newmortal();
4719 regprop(r, sv, (regnode*)data.start_class);
4720 PerlIO_printf(Perl_debug_log,
4721 "synthetic stclass \"%s\".\n",
4722 SvPVX_const(sv));});
4726 /* Guard against an embedded (?=) or (?<=) with a longer minlen than
4727 the "real" pattern. */
4729 PerlIO_printf(Perl_debug_log,"minlen: %"IVdf" r->minlen:%"IVdf"\n",
4730 (IV)minlen, (IV)r->minlen);
4732 r->minlenret = minlen;
4733 if (r->minlen < minlen)
4736 if (RExC_seen & REG_SEEN_GPOS)
4737 r->extflags |= RXf_GPOS_SEEN;
4738 if (RExC_seen & REG_SEEN_LOOKBEHIND)
4739 r->extflags |= RXf_LOOKBEHIND_SEEN;
4740 if (RExC_seen & REG_SEEN_EVAL)
4741 r->extflags |= RXf_EVAL_SEEN;
4742 if (RExC_seen & REG_SEEN_CANY)
4743 r->extflags |= RXf_CANY_SEEN;
4744 if (RExC_seen & REG_SEEN_VERBARG)
4745 r->intflags |= PREGf_VERBARG_SEEN;
4746 if (RExC_seen & REG_SEEN_CUTGROUP)
4747 r->intflags |= PREGf_CUTGROUP_SEEN;
4748 if (RExC_paren_names)
4749 r->paren_names = (HV*)SvREFCNT_inc(RExC_paren_names);
4751 r->paren_names = NULL;
4752 if (r->prelen == 3 && strnEQ("\\s+", r->precomp, 3)) /* precomp = "\\s+)" */
4753 r->extflags |= RXf_WHITE;
4754 else if (r->prelen == 1 && r->precomp[0] == '^')
4755 r->extflags |= RXf_START_ONLY;
4758 if (RExC_paren_names) {
4759 ri->name_list_idx = add_data( pRExC_state, 1, "p" );
4760 ri->data->data[ri->name_list_idx] = (void*)SvREFCNT_inc(RExC_paren_name_list);
4763 ri->name_list_idx = 0;
4765 if (RExC_recurse_count) {
4766 for ( ; RExC_recurse_count ; RExC_recurse_count-- ) {
4767 const regnode *scan = RExC_recurse[RExC_recurse_count-1];
4768 ARG2L_SET( scan, RExC_open_parens[ARG(scan)-1] - scan );
4771 Newxz(r->offs, RExC_npar, regexp_paren_pair);
4772 /* assume we don't need to swap parens around before we match */
4775 PerlIO_printf(Perl_debug_log,"Final program:\n");
4778 #ifdef RE_TRACK_PATTERN_OFFSETS
4779 DEBUG_OFFSETS_r(if (ri->u.offsets) {
4780 const U32 len = ri->u.offsets[0];
4782 GET_RE_DEBUG_FLAGS_DECL;
4783 PerlIO_printf(Perl_debug_log, "Offsets: [%"UVuf"]\n\t", (UV)ri->u.offsets[0]);
4784 for (i = 1; i <= len; i++) {
4785 if (ri->u.offsets[i*2-1] || ri->u.offsets[i*2])
4786 PerlIO_printf(Perl_debug_log, "%"UVuf":%"UVuf"[%"UVuf"] ",
4787 (UV)i, (UV)ri->u.offsets[i*2-1], (UV)ri->u.offsets[i*2]);
4789 PerlIO_printf(Perl_debug_log, "\n");
4795 #undef RE_ENGINE_PTR
4799 Perl_reg_named_buff_get(pTHX_ REGEXP * const rx, SV * const namesv, const U32 flags)
4801 AV *retarray = NULL;
4806 if (rx && rx->paren_names) {
4807 HE *he_str = hv_fetch_ent( rx->paren_names, namesv, 0, 0 );
4810 SV* sv_dat=HeVAL(he_str);
4811 I32 *nums=(I32*)SvPVX(sv_dat);
4812 for ( i=0; i<SvIVX(sv_dat); i++ ) {
4813 if ((I32)(rx->nparens) >= nums[i]
4814 && rx->offs[nums[i]].start != -1
4815 && rx->offs[nums[i]].end != -1)
4818 CALLREG_NUMBUF(rx,nums[i],ret);
4822 ret = newSVsv(&PL_sv_undef);
4825 SvREFCNT_inc_simple_void(ret);
4826 av_push(retarray, ret);
4830 return (SV*)retarray;
4837 Perl_reg_numbered_buff_get(pTHX_ REGEXP * const rx, const I32 paren, SV * const sv)
4844 sv_setsv(sv,&PL_sv_undef);
4848 if (paren == -2 && rx->offs[0].start != -1) {
4850 i = rx->offs[0].start;
4854 if (paren == -1 && rx->offs[0].end != -1) {
4856 s = rx->subbeg + rx->offs[0].end;
4857 i = rx->sublen - rx->offs[0].end;
4860 if ( 0 <= paren && paren <= (I32)rx->nparens &&
4861 (s1 = rx->offs[paren].start) != -1 &&
4862 (t1 = rx->offs[paren].end) != -1)
4866 s = rx->subbeg + s1;
4868 sv_setsv(sv,&PL_sv_undef);
4871 assert(rx->sublen >= (s - rx->subbeg) + i );
4873 const int oldtainted = PL_tainted;
4875 sv_setpvn(sv, s, i);
4876 PL_tainted = oldtainted;
4877 if ( (rx->extflags & RXf_CANY_SEEN)
4878 ? (RX_MATCH_UTF8(rx)
4879 && (!i || is_utf8_string((U8*)s, i)))
4880 : (RX_MATCH_UTF8(rx)) )
4887 if (RX_MATCH_TAINTED(rx)) {
4888 if (SvTYPE(sv) >= SVt_PVMG) {
4889 MAGIC* const mg = SvMAGIC(sv);
4892 SvMAGIC_set(sv, mg->mg_moremagic);
4894 if ((mgt = SvMAGIC(sv))) {
4895 mg->mg_moremagic = mgt;
4896 SvMAGIC_set(sv, mg);
4906 sv_setsv(sv,&PL_sv_undef);
4912 Perl_reg_qr_package(pTHX_ REGEXP * const rx)
4914 PERL_UNUSED_ARG(rx);
4915 return newSVpvs("Regexp");
4918 /* Scans the name of a named buffer from the pattern.
4919 * If flags is REG_RSN_RETURN_NULL returns null.
4920 * If flags is REG_RSN_RETURN_NAME returns an SV* containing the name
4921 * If flags is REG_RSN_RETURN_DATA returns the data SV* corresponding
4922 * to the parsed name as looked up in the RExC_paren_names hash.
4923 * If there is an error throws a vFAIL().. type exception.
4926 #define REG_RSN_RETURN_NULL 0
4927 #define REG_RSN_RETURN_NAME 1
4928 #define REG_RSN_RETURN_DATA 2
4931 S_reg_scan_name(pTHX_ RExC_state_t *pRExC_state, U32 flags) {
4932 char *name_start = RExC_parse;
4934 if (isIDFIRST_lazy_if(RExC_parse, UTF)) {
4935 /* skip IDFIRST by using do...while */
4938 RExC_parse += UTF8SKIP(RExC_parse);
4939 } while (isALNUM_utf8((U8*)RExC_parse));
4943 } while (isALNUM(*RExC_parse));
4947 SV* sv_name = sv_2mortal(Perl_newSVpvn(aTHX_ name_start,
4948 (int)(RExC_parse - name_start)));
4951 if ( flags == REG_RSN_RETURN_NAME)
4953 else if (flags==REG_RSN_RETURN_DATA) {
4956 if ( ! sv_name ) /* should not happen*/
4957 Perl_croak(aTHX_ "panic: no svname in reg_scan_name");
4958 if (RExC_paren_names)
4959 he_str = hv_fetch_ent( RExC_paren_names, sv_name, 0, 0 );
4961 sv_dat = HeVAL(he_str);
4963 vFAIL("Reference to nonexistent named group");
4967 Perl_croak(aTHX_ "panic: bad flag in reg_scan_name");
4974 #define DEBUG_PARSE_MSG(funcname) DEBUG_PARSE_r({ \
4975 int rem=(int)(RExC_end - RExC_parse); \
4984 if (RExC_lastparse!=RExC_parse) \
4985 PerlIO_printf(Perl_debug_log," >%.*s%-*s", \
4988 iscut ? "..." : "<" \
4991 PerlIO_printf(Perl_debug_log,"%16s",""); \
4994 num = RExC_size + 1; \
4996 num=REG_NODE_NUM(RExC_emit); \
4997 if (RExC_lastnum!=num) \
4998 PerlIO_printf(Perl_debug_log,"|%4d",num); \
5000 PerlIO_printf(Perl_debug_log,"|%4s",""); \
5001 PerlIO_printf(Perl_debug_log,"|%*s%-4s", \
5002 (int)((depth*2)), "", \
5006 RExC_lastparse=RExC_parse; \
5011 #define DEBUG_PARSE(funcname) DEBUG_PARSE_r({ \
5012 DEBUG_PARSE_MSG((funcname)); \
5013 PerlIO_printf(Perl_debug_log,"%4s","\n"); \
5015 #define DEBUG_PARSE_FMT(funcname,fmt,args) DEBUG_PARSE_r({ \
5016 DEBUG_PARSE_MSG((funcname)); \
5017 PerlIO_printf(Perl_debug_log,fmt "\n",args); \
5020 - reg - regular expression, i.e. main body or parenthesized thing
5022 * Caller must absorb opening parenthesis.
5024 * Combining parenthesis handling with the base level of regular expression
5025 * is a trifle forced, but the need to tie the tails of the branches to what
5026 * follows makes it hard to avoid.
5028 #define REGTAIL(x,y,z) regtail((x),(y),(z),depth+1)
5030 #define REGTAIL_STUDY(x,y,z) regtail_study((x),(y),(z),depth+1)
5032 #define REGTAIL_STUDY(x,y,z) regtail((x),(y),(z),depth+1)
5036 S_reg(pTHX_ RExC_state_t *pRExC_state, I32 paren, I32 *flagp,U32 depth)
5037 /* paren: Parenthesized? 0=top, 1=(, inside: changed to letter. */
5040 register regnode *ret; /* Will be the head of the group. */
5041 register regnode *br;
5042 register regnode *lastbr;
5043 register regnode *ender = NULL;
5044 register I32 parno = 0;
5046 const I32 oregflags = RExC_flags;
5047 bool have_branch = 0;
5049 I32 freeze_paren = 0;
5050 I32 after_freeze = 0;
5052 /* for (?g), (?gc), and (?o) warnings; warning
5053 about (?c) will warn about (?g) -- japhy */
5055 #define WASTED_O 0x01
5056 #define WASTED_G 0x02
5057 #define WASTED_C 0x04
5058 #define WASTED_GC (0x02|0x04)
5059 I32 wastedflags = 0x00;
5061 char * parse_start = RExC_parse; /* MJD */
5062 char * const oregcomp_parse = RExC_parse;
5064 GET_RE_DEBUG_FLAGS_DECL;
5065 DEBUG_PARSE("reg ");
5067 *flagp = 0; /* Tentatively. */
5070 /* Make an OPEN node, if parenthesized. */
5072 if ( *RExC_parse == '*') { /* (*VERB:ARG) */
5073 char *start_verb = RExC_parse;
5074 STRLEN verb_len = 0;
5075 char *start_arg = NULL;
5076 unsigned char op = 0;
5078 int internal_argval = 0; /* internal_argval is only useful if !argok */
5079 while ( *RExC_parse && *RExC_parse != ')' ) {
5080 if ( *RExC_parse == ':' ) {
5081 start_arg = RExC_parse + 1;
5087 verb_len = RExC_parse - start_verb;
5090 while ( *RExC_parse && *RExC_parse != ')' )
5092 if ( *RExC_parse != ')' )
5093 vFAIL("Unterminated verb pattern argument");
5094 if ( RExC_parse == start_arg )
5097 if ( *RExC_parse != ')' )
5098 vFAIL("Unterminated verb pattern");
5101 switch ( *start_verb ) {
5102 case 'A': /* (*ACCEPT) */
5103 if ( memEQs(start_verb,verb_len,"ACCEPT") ) {
5105 internal_argval = RExC_nestroot;
5108 case 'C': /* (*COMMIT) */
5109 if ( memEQs(start_verb,verb_len,"COMMIT") )
5112 case 'F': /* (*FAIL) */
5113 if ( verb_len==1 || memEQs(start_verb,verb_len,"FAIL") ) {
5118 case ':': /* (*:NAME) */
5119 case 'M': /* (*MARK:NAME) */
5120 if ( verb_len==0 || memEQs(start_verb,verb_len,"MARK") ) {
5125 case 'P': /* (*PRUNE) */
5126 if ( memEQs(start_verb,verb_len,"PRUNE") )
5129 case 'S': /* (*SKIP) */
5130 if ( memEQs(start_verb,verb_len,"SKIP") )
5133 case 'T': /* (*THEN) */
5134 /* [19:06] <TimToady> :: is then */
5135 if ( memEQs(start_verb,verb_len,"THEN") ) {
5137 RExC_seen |= REG_SEEN_CUTGROUP;
5143 vFAIL3("Unknown verb pattern '%.*s'",
5144 verb_len, start_verb);
5147 if ( start_arg && internal_argval ) {
5148 vFAIL3("Verb pattern '%.*s' may not have an argument",
5149 verb_len, start_verb);
5150 } else if ( argok < 0 && !start_arg ) {
5151 vFAIL3("Verb pattern '%.*s' has a mandatory argument",
5152 verb_len, start_verb);
5154 ret = reganode(pRExC_state, op, internal_argval);
5155 if ( ! internal_argval && ! SIZE_ONLY ) {
5157 SV *sv = newSVpvn( start_arg, RExC_parse - start_arg);
5158 ARG(ret) = add_data( pRExC_state, 1, "S" );
5159 RExC_rxi->data->data[ARG(ret)]=(void*)sv;
5166 if (!internal_argval)
5167 RExC_seen |= REG_SEEN_VERBARG;
5168 } else if ( start_arg ) {
5169 vFAIL3("Verb pattern '%.*s' may not have an argument",
5170 verb_len, start_verb);
5172 ret = reg_node(pRExC_state, op);
5174 nextchar(pRExC_state);
5177 if (*RExC_parse == '?') { /* (?...) */
5178 bool is_logical = 0;
5179 const char * const seqstart = RExC_parse;
5182 paren = *RExC_parse++;
5183 ret = NULL; /* For look-ahead/behind. */
5186 case 'P': /* (?P...) variants for those used to PCRE/Python */
5187 paren = *RExC_parse++;
5188 if ( paren == '<') /* (?P<...>) named capture */
5190 else if (paren == '>') { /* (?P>name) named recursion */
5191 goto named_recursion;
5193 else if (paren == '=') { /* (?P=...) named backref */
5194 /* this pretty much dupes the code for \k<NAME> in regatom(), if
5195 you change this make sure you change that */
5196 char* name_start = RExC_parse;
5198 SV *sv_dat = reg_scan_name(pRExC_state,
5199 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5200 if (RExC_parse == name_start || *RExC_parse != ')')
5201 vFAIL2("Sequence %.3s... not terminated",parse_start);
5204 num = add_data( pRExC_state, 1, "S" );
5205 RExC_rxi->data->data[num]=(void*)sv_dat;
5206 SvREFCNT_inc_simple_void(sv_dat);
5209 ret = reganode(pRExC_state,
5210 (U8)(FOLD ? (LOC ? NREFFL : NREFF) : NREF),
5214 Set_Node_Offset(ret, parse_start+1);
5215 Set_Node_Cur_Length(ret); /* MJD */
5217 nextchar(pRExC_state);
5221 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5223 case '<': /* (?<...) */
5224 if (*RExC_parse == '!')
5226 else if (*RExC_parse != '=')
5232 case '\'': /* (?'...') */
5233 name_start= RExC_parse;
5234 svname = reg_scan_name(pRExC_state,
5235 SIZE_ONLY ? /* reverse test from the others */
5236 REG_RSN_RETURN_NAME :
5237 REG_RSN_RETURN_NULL);
5238 if (RExC_parse == name_start) {
5240 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5243 if (*RExC_parse != paren)
5244 vFAIL2("Sequence (?%c... not terminated",
5245 paren=='>' ? '<' : paren);
5249 if (!svname) /* shouldnt happen */
5251 "panic: reg_scan_name returned NULL");
5252 if (!RExC_paren_names) {
5253 RExC_paren_names= newHV();
5254 sv_2mortal((SV*)RExC_paren_names);
5256 RExC_paren_name_list= newAV();
5257 sv_2mortal((SV*)RExC_paren_name_list);
5260 he_str = hv_fetch_ent( RExC_paren_names, svname, 1, 0 );
5262 sv_dat = HeVAL(he_str);
5264 /* croak baby croak */
5266 "panic: paren_name hash element allocation failed");
5267 } else if ( SvPOK(sv_dat) ) {
5268 /* (?|...) can mean we have dupes so scan to check
5269 its already been stored. Maybe a flag indicating
5270 we are inside such a construct would be useful,
5271 but the arrays are likely to be quite small, so
5272 for now we punt -- dmq */
5273 IV count = SvIV(sv_dat);
5274 I32 *pv = (I32*)SvPVX(sv_dat);
5276 for ( i = 0 ; i < count ; i++ ) {
5277 if ( pv[i] == RExC_npar ) {
5283 pv = (I32*)SvGROW(sv_dat, SvCUR(sv_dat) + sizeof(I32)+1);
5284 SvCUR_set(sv_dat, SvCUR(sv_dat) + sizeof(I32));
5285 pv[count] = RExC_npar;
5289 (void)SvUPGRADE(sv_dat,SVt_PVNV);
5290 sv_setpvn(sv_dat, (char *)&(RExC_npar), sizeof(I32));
5295 if (!av_store(RExC_paren_name_list, RExC_npar, SvREFCNT_inc(svname)))
5296 SvREFCNT_dec(svname);
5299 /*sv_dump(sv_dat);*/
5301 nextchar(pRExC_state);
5303 goto capturing_parens;
5305 RExC_seen |= REG_SEEN_LOOKBEHIND;
5307 case '=': /* (?=...) */
5308 case '!': /* (?!...) */
5309 RExC_seen_zerolen++;
5310 if (*RExC_parse == ')') {
5311 ret=reg_node(pRExC_state, OPFAIL);
5312 nextchar(pRExC_state);
5316 case '|': /* (?|...) */
5317 /* branch reset, behave like a (?:...) except that
5318 buffers in alternations share the same numbers */
5320 after_freeze = freeze_paren = RExC_npar;
5322 case ':': /* (?:...) */
5323 case '>': /* (?>...) */
5325 case '$': /* (?$...) */
5326 case '@': /* (?@...) */
5327 vFAIL2("Sequence (?%c...) not implemented", (int)paren);
5329 case '#': /* (?#...) */
5330 while (*RExC_parse && *RExC_parse != ')')
5332 if (*RExC_parse != ')')
5333 FAIL("Sequence (?#... not terminated");
5334 nextchar(pRExC_state);
5337 case '0' : /* (?0) */
5338 case 'R' : /* (?R) */
5339 if (*RExC_parse != ')')
5340 FAIL("Sequence (?R) not terminated");
5341 ret = reg_node(pRExC_state, GOSTART);
5342 *flagp |= POSTPONED;
5343 nextchar(pRExC_state);
5346 { /* named and numeric backreferences */
5348 case '&': /* (?&NAME) */
5349 parse_start = RExC_parse - 1;
5352 SV *sv_dat = reg_scan_name(pRExC_state,
5353 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5354 num = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
5356 goto gen_recurse_regop;
5359 if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
5361 vFAIL("Illegal pattern");
5363 goto parse_recursion;
5365 case '-': /* (?-1) */
5366 if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
5367 RExC_parse--; /* rewind to let it be handled later */
5371 case '1': case '2': case '3': case '4': /* (?1) */
5372 case '5': case '6': case '7': case '8': case '9':
5375 num = atoi(RExC_parse);
5376 parse_start = RExC_parse - 1; /* MJD */
5377 if (*RExC_parse == '-')
5379 while (isDIGIT(*RExC_parse))
5381 if (*RExC_parse!=')')
5382 vFAIL("Expecting close bracket");
5385 if ( paren == '-' ) {
5387 Diagram of capture buffer numbering.
5388 Top line is the normal capture buffer numbers
5389 Botton line is the negative indexing as from
5393 /(a(x)y)(a(b(c(?-2)d)e)f)(g(h))/
5397 num = RExC_npar + num;
5400 vFAIL("Reference to nonexistent group");
5402 } else if ( paren == '+' ) {
5403 num = RExC_npar + num - 1;
5406 ret = reganode(pRExC_state, GOSUB, num);
5408 if (num > (I32)RExC_rx->nparens) {
5410 vFAIL("Reference to nonexistent group");
5412 ARG2L_SET( ret, RExC_recurse_count++);
5414 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
5415 "Recurse #%"UVuf" to %"IVdf"\n", (UV)ARG(ret), (IV)ARG2L(ret)));
5419 RExC_seen |= REG_SEEN_RECURSE;
5420 Set_Node_Length(ret, 1 + regarglen[OP(ret)]); /* MJD */
5421 Set_Node_Offset(ret, parse_start); /* MJD */
5423 *flagp |= POSTPONED;
5424 nextchar(pRExC_state);
5426 } /* named and numeric backreferences */
5429 case '?': /* (??...) */
5431 if (*RExC_parse != '{') {
5433 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5436 *flagp |= POSTPONED;
5437 paren = *RExC_parse++;
5439 case '{': /* (?{...}) */
5444 char *s = RExC_parse;
5446 RExC_seen_zerolen++;
5447 RExC_seen |= REG_SEEN_EVAL;
5448 while (count && (c = *RExC_parse)) {
5459 if (*RExC_parse != ')') {
5461 vFAIL("Sequence (?{...}) not terminated or not {}-balanced");
5465 OP_4tree *sop, *rop;
5466 SV * const sv = newSVpvn(s, RExC_parse - 1 - s);
5469 Perl_save_re_context(aTHX);
5470 rop = sv_compile_2op(sv, &sop, "re", &pad);
5471 sop->op_private |= OPpREFCOUNTED;
5472 /* re_dup will OpREFCNT_inc */
5473 OpREFCNT_set(sop, 1);
5476 n = add_data(pRExC_state, 3, "nop");
5477 RExC_rxi->data->data[n] = (void*)rop;
5478 RExC_rxi->data->data[n+1] = (void*)sop;
5479 RExC_rxi->data->data[n+2] = (void*)pad;
5482 else { /* First pass */
5483 if (PL_reginterp_cnt < ++RExC_seen_evals
5485 /* No compiled RE interpolated, has runtime
5486 components ===> unsafe. */
5487 FAIL("Eval-group not allowed at runtime, use re 'eval'");
5488 if (PL_tainting && PL_tainted)
5489 FAIL("Eval-group in insecure regular expression");
5490 #if PERL_VERSION > 8
5491 if (IN_PERL_COMPILETIME)
5496 nextchar(pRExC_state);
5498 ret = reg_node(pRExC_state, LOGICAL);
5501 REGTAIL(pRExC_state, ret, reganode(pRExC_state, EVAL, n));
5502 /* deal with the length of this later - MJD */
5505 ret = reganode(pRExC_state, EVAL, n);
5506 Set_Node_Length(ret, RExC_parse - parse_start + 1);
5507 Set_Node_Offset(ret, parse_start);
5510 case '(': /* (?(?{...})...) and (?(?=...)...) */
5513 if (RExC_parse[0] == '?') { /* (?(?...)) */
5514 if (RExC_parse[1] == '=' || RExC_parse[1] == '!'
5515 || RExC_parse[1] == '<'
5516 || RExC_parse[1] == '{') { /* Lookahead or eval. */
5519 ret = reg_node(pRExC_state, LOGICAL);
5522 REGTAIL(pRExC_state, ret, reg(pRExC_state, 1, &flag,depth+1));
5526 else if ( RExC_parse[0] == '<' /* (?(<NAME>)...) */
5527 || RExC_parse[0] == '\'' ) /* (?('NAME')...) */
5529 char ch = RExC_parse[0] == '<' ? '>' : '\'';
5530 char *name_start= RExC_parse++;
5532 SV *sv_dat=reg_scan_name(pRExC_state,
5533 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5534 if (RExC_parse == name_start || *RExC_parse != ch)
5535 vFAIL2("Sequence (?(%c... not terminated",
5536 (ch == '>' ? '<' : ch));
5539 num = add_data( pRExC_state, 1, "S" );
5540 RExC_rxi->data->data[num]=(void*)sv_dat;
5541 SvREFCNT_inc_simple_void(sv_dat);
5543 ret = reganode(pRExC_state,NGROUPP,num);
5544 goto insert_if_check_paren;
5546 else if (RExC_parse[0] == 'D' &&
5547 RExC_parse[1] == 'E' &&
5548 RExC_parse[2] == 'F' &&
5549 RExC_parse[3] == 'I' &&
5550 RExC_parse[4] == 'N' &&
5551 RExC_parse[5] == 'E')
5553 ret = reganode(pRExC_state,DEFINEP,0);
5556 goto insert_if_check_paren;
5558 else if (RExC_parse[0] == 'R') {
5561 if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
5562 parno = atoi(RExC_parse++);
5563 while (isDIGIT(*RExC_parse))
5565 } else if (RExC_parse[0] == '&') {
5568 sv_dat = reg_scan_name(pRExC_state,
5569 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5570 parno = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
5572 ret = reganode(pRExC_state,INSUBP,parno);
5573 goto insert_if_check_paren;
5575 else if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
5578 parno = atoi(RExC_parse++);
5580 while (isDIGIT(*RExC_parse))
5582 ret = reganode(pRExC_state, GROUPP, parno);
5584 insert_if_check_paren:
5585 if ((c = *nextchar(pRExC_state)) != ')')
5586 vFAIL("Switch condition not recognized");
5588 REGTAIL(pRExC_state, ret, reganode(pRExC_state, IFTHEN, 0));
5589 br = regbranch(pRExC_state, &flags, 1,depth+1);
5591 br = reganode(pRExC_state, LONGJMP, 0);
5593 REGTAIL(pRExC_state, br, reganode(pRExC_state, LONGJMP, 0));
5594 c = *nextchar(pRExC_state);
5599 vFAIL("(?(DEFINE)....) does not allow branches");
5600 lastbr = reganode(pRExC_state, IFTHEN, 0); /* Fake one for optimizer. */
5601 regbranch(pRExC_state, &flags, 1,depth+1);
5602 REGTAIL(pRExC_state, ret, lastbr);
5605 c = *nextchar(pRExC_state);
5610 vFAIL("Switch (?(condition)... contains too many branches");
5611 ender = reg_node(pRExC_state, TAIL);
5612 REGTAIL(pRExC_state, br, ender);
5614 REGTAIL(pRExC_state, lastbr, ender);
5615 REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender);
5618 REGTAIL(pRExC_state, ret, ender);
5619 RExC_size++; /* XXX WHY do we need this?!!
5620 For large programs it seems to be required
5621 but I can't figure out why. -- dmq*/
5625 vFAIL2("Unknown switch condition (?(%.2s", RExC_parse);
5629 RExC_parse--; /* for vFAIL to print correctly */
5630 vFAIL("Sequence (? incomplete");
5634 parse_flags: /* (?i) */
5636 U32 posflags = 0, negflags = 0;
5637 U32 *flagsp = &posflags;
5639 while (*RExC_parse) {
5640 /* && strchr("iogcmsx", *RExC_parse) */
5641 /* (?g), (?gc) and (?o) are useless here
5642 and must be globally applied -- japhy */
5643 switch (*RExC_parse) {
5644 CASE_STD_PMMOD_FLAGS_PARSE_SET(flagsp);
5647 if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
5648 const I32 wflagbit = *RExC_parse == 'o' ? WASTED_O : WASTED_G;
5649 if (! (wastedflags & wflagbit) ) {
5650 wastedflags |= wflagbit;
5653 "Useless (%s%c) - %suse /%c modifier",
5654 flagsp == &negflags ? "?-" : "?",
5656 flagsp == &negflags ? "don't " : "",
5664 if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
5665 if (! (wastedflags & WASTED_C) ) {
5666 wastedflags |= WASTED_GC;
5669 "Useless (%sc) - %suse /gc modifier",
5670 flagsp == &negflags ? "?-" : "?",
5671 flagsp == &negflags ? "don't " : ""
5677 if (flagsp == &negflags) {
5678 if (SIZE_ONLY && ckWARN(WARN_REGEXP))
5679 vWARN(RExC_parse + 1,"Useless use of (?-k)");
5681 *flagsp |= RXf_PMf_KEEPCOPY;
5685 if (flagsp == &negflags) {
5687 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5691 wastedflags = 0; /* reset so (?g-c) warns twice */
5697 RExC_flags |= posflags;
5698 RExC_flags &= ~negflags;
5699 nextchar(pRExC_state);
5710 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5715 }} /* one for the default block, one for the switch */
5722 ret = reganode(pRExC_state, OPEN, parno);
5725 RExC_nestroot = parno;
5726 if (RExC_seen & REG_SEEN_RECURSE
5727 && !RExC_open_parens[parno-1])
5729 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
5730 "Setting open paren #%"IVdf" to %d\n",
5731 (IV)parno, REG_NODE_NUM(ret)));
5732 RExC_open_parens[parno-1]= ret;
5735 Set_Node_Length(ret, 1); /* MJD */
5736 Set_Node_Offset(ret, RExC_parse); /* MJD */
5744 /* Pick up the branches, linking them together. */
5745 parse_start = RExC_parse; /* MJD */
5746 br = regbranch(pRExC_state, &flags, 1,depth+1);
5747 /* branch_len = (paren != 0); */
5751 if (*RExC_parse == '|') {
5752 if (!SIZE_ONLY && RExC_extralen) {
5753 reginsert(pRExC_state, BRANCHJ, br, depth+1);
5756 reginsert(pRExC_state, BRANCH, br, depth+1);
5757 Set_Node_Length(br, paren != 0);
5758 Set_Node_Offset_To_R(br-RExC_emit_start, parse_start-RExC_start);
5762 RExC_extralen += 1; /* For BRANCHJ-BRANCH. */
5764 else if (paren == ':') {
5765 *flagp |= flags&SIMPLE;
5767 if (is_open) { /* Starts with OPEN. */
5768 REGTAIL(pRExC_state, ret, br); /* OPEN -> first. */
5770 else if (paren != '?') /* Not Conditional */
5772 *flagp |= flags & (SPSTART | HASWIDTH | POSTPONED);
5774 while (*RExC_parse == '|') {
5775 if (!SIZE_ONLY && RExC_extralen) {
5776 ender = reganode(pRExC_state, LONGJMP,0);
5777 REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender); /* Append to the previous. */
5780 RExC_extralen += 2; /* Account for LONGJMP. */
5781 nextchar(pRExC_state);
5783 if (RExC_npar > after_freeze)
5784 after_freeze = RExC_npar;
5785 RExC_npar = freeze_paren;
5787 br = regbranch(pRExC_state, &flags, 0, depth+1);
5791 REGTAIL(pRExC_state, lastbr, br); /* BRANCH -> BRANCH. */
5793 *flagp |= flags & (SPSTART | HASWIDTH | POSTPONED);
5796 if (have_branch || paren != ':') {
5797 /* Make a closing node, and hook it on the end. */
5800 ender = reg_node(pRExC_state, TAIL);
5803 ender = reganode(pRExC_state, CLOSE, parno);
5804 if (!SIZE_ONLY && RExC_seen & REG_SEEN_RECURSE) {
5805 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
5806 "Setting close paren #%"IVdf" to %d\n",
5807 (IV)parno, REG_NODE_NUM(ender)));
5808 RExC_close_parens[parno-1]= ender;
5809 if (RExC_nestroot == parno)
5812 Set_Node_Offset(ender,RExC_parse+1); /* MJD */
5813 Set_Node_Length(ender,1); /* MJD */
5819 *flagp &= ~HASWIDTH;
5822 ender = reg_node(pRExC_state, SUCCEED);
5825 ender = reg_node(pRExC_state, END);
5827 assert(!RExC_opend); /* there can only be one! */
5832 REGTAIL(pRExC_state, lastbr, ender);
5834 if (have_branch && !SIZE_ONLY) {
5836 RExC_seen |= REG_TOP_LEVEL_BRANCHES;
5838 /* Hook the tails of the branches to the closing node. */
5839 for (br = ret; br; br = regnext(br)) {
5840 const U8 op = PL_regkind[OP(br)];
5842 REGTAIL_STUDY(pRExC_state, NEXTOPER(br), ender);
5844 else if (op == BRANCHJ) {
5845 REGTAIL_STUDY(pRExC_state, NEXTOPER(NEXTOPER(br)), ender);
5853 static const char parens[] = "=!<,>";
5855 if (paren && (p = strchr(parens, paren))) {
5856 U8 node = ((p - parens) % 2) ? UNLESSM : IFMATCH;
5857 int flag = (p - parens) > 1;
5860 node = SUSPEND, flag = 0;
5861 reginsert(pRExC_state, node,ret, depth+1);
5862 Set_Node_Cur_Length(ret);
5863 Set_Node_Offset(ret, parse_start + 1);
5865 REGTAIL_STUDY(pRExC_state, ret, reg_node(pRExC_state, TAIL));
5869 /* Check for proper termination. */
5871 RExC_flags = oregflags;
5872 if (RExC_parse >= RExC_end || *nextchar(pRExC_state) != ')') {
5873 RExC_parse = oregcomp_parse;
5874 vFAIL("Unmatched (");
5877 else if (!paren && RExC_parse < RExC_end) {
5878 if (*RExC_parse == ')') {
5880 vFAIL("Unmatched )");
5883 FAIL("Junk on end of regexp"); /* "Can't happen". */
5887 RExC_npar = after_freeze;
5892 - regbranch - one alternative of an | operator
5894 * Implements the concatenation operator.
5897 S_regbranch(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, I32 first, U32 depth)
5900 register regnode *ret;
5901 register regnode *chain = NULL;
5902 register regnode *latest;
5903 I32 flags = 0, c = 0;
5904 GET_RE_DEBUG_FLAGS_DECL;
5905 DEBUG_PARSE("brnc");
5910 if (!SIZE_ONLY && RExC_extralen)
5911 ret = reganode(pRExC_state, BRANCHJ,0);
5913 ret = reg_node(pRExC_state, BRANCH);
5914 Set_Node_Length(ret, 1);
5918 if (!first && SIZE_ONLY)
5919 RExC_extralen += 1; /* BRANCHJ */
5921 *flagp = WORST; /* Tentatively. */
5924 nextchar(pRExC_state);
5925 while (RExC_parse < RExC_end && *RExC_parse != '|' && *RExC_parse != ')') {
5927 latest = regpiece(pRExC_state, &flags,depth+1);
5928 if (latest == NULL) {
5929 if (flags & TRYAGAIN)
5933 else if (ret == NULL)
5935 *flagp |= flags&(HASWIDTH|POSTPONED);
5936 if (chain == NULL) /* First piece. */
5937 *flagp |= flags&SPSTART;
5940 REGTAIL(pRExC_state, chain, latest);
5945 if (chain == NULL) { /* Loop ran zero times. */
5946 chain = reg_node(pRExC_state, NOTHING);
5951 *flagp |= flags&SIMPLE;
5958 - regpiece - something followed by possible [*+?]
5960 * Note that the branching code sequences used for ? and the general cases
5961 * of * and + are somewhat optimized: they use the same NOTHING node as
5962 * both the endmarker for their branch list and the body of the last branch.
5963 * It might seem that this node could be dispensed with entirely, but the
5964 * endmarker role is not redundant.
5967 S_regpiece(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
5970 register regnode *ret;
5972 register char *next;
5974 const char * const origparse = RExC_parse;
5976 I32 max = REG_INFTY;
5978 const char *maxpos = NULL;
5979 GET_RE_DEBUG_FLAGS_DECL;
5980 DEBUG_PARSE("piec");
5982 ret = regatom(pRExC_state, &flags,depth+1);
5984 if (flags & TRYAGAIN)
5991 if (op == '{' && regcurly(RExC_parse)) {
5993 parse_start = RExC_parse; /* MJD */
5994 next = RExC_parse + 1;
5995 while (isDIGIT(*next) || *next == ',') {
6004 if (*next == '}') { /* got one */
6008 min = atoi(RExC_parse);
6012 maxpos = RExC_parse;
6014 if (!max && *maxpos != '0')
6015 max = REG_INFTY; /* meaning "infinity" */
6016 else if (max >= REG_INFTY)
6017 vFAIL2("Quantifier in {,} bigger than %d", REG_INFTY - 1);
6019 nextchar(pRExC_state);
6022 if ((flags&SIMPLE)) {
6023 RExC_naughty += 2 + RExC_naughty / 2;
6024 reginsert(pRExC_state, CURLY, ret, depth+1);
6025 Set_Node_Offset(ret, parse_start+1); /* MJD */
6026 Set_Node_Cur_Length(ret);
6029 regnode * const w = reg_node(pRExC_state, WHILEM);
6032 REGTAIL(pRExC_state, ret, w);
6033 if (!SIZE_ONLY && RExC_extralen) {
6034 reginsert(pRExC_state, LONGJMP,ret, depth+1);
6035 reginsert(pRExC_state, NOTHING,ret, depth+1);
6036 NEXT_OFF(ret) = 3; /* Go over LONGJMP. */
6038 reginsert(pRExC_state, CURLYX,ret, depth+1);
6040 Set_Node_Offset(ret, parse_start+1);
6041 Set_Node_Length(ret,
6042 op == '{' ? (RExC_parse - parse_start) : 1);
6044 if (!SIZE_ONLY && RExC_extralen)
6045 NEXT_OFF(ret) = 3; /* Go over NOTHING to LONGJMP. */
6046 REGTAIL(pRExC_state, ret, reg_node(pRExC_state, NOTHING));
6048 RExC_whilem_seen++, RExC_extralen += 3;
6049 RExC_naughty += 4 + RExC_naughty; /* compound interest */
6057 if (max && max < min)
6058 vFAIL("Can't do {n,m} with n > m");
6060 ARG1_SET(ret, (U16)min);
6061 ARG2_SET(ret, (U16)max);
6073 #if 0 /* Now runtime fix should be reliable. */
6075 /* if this is reinstated, don't forget to put this back into perldiag:
6077 =item Regexp *+ operand could be empty at {#} in regex m/%s/
6079 (F) The part of the regexp subject to either the * or + quantifier
6080 could match an empty string. The {#} shows in the regular
6081 expression about where the problem was discovered.
6085 if (!(flags&HASWIDTH) && op != '?')
6086 vFAIL("Regexp *+ operand could be empty");
6089 parse_start = RExC_parse;
6090 nextchar(pRExC_state);
6092 *flagp = (op != '+') ? (WORST|SPSTART|HASWIDTH) : (WORST|HASWIDTH);
6094 if (op == '*' && (flags&SIMPLE)) {
6095 reginsert(pRExC_state, STAR, ret, depth+1);
6099 else if (op == '*') {
6103 else if (op == '+' && (flags&SIMPLE)) {
6104 reginsert(pRExC_state, PLUS, ret, depth+1);
6108 else if (op == '+') {
6112 else if (op == '?') {
6117 if (!SIZE_ONLY && !(flags&(HASWIDTH|POSTPONED)) && max > REG_INFTY/3 && ckWARN(WARN_REGEXP)) {
6119 "%.*s matches null string many times",
6120 (int)(RExC_parse >= origparse ? RExC_parse - origparse : 0),
6124 if (RExC_parse < RExC_end && *RExC_parse == '?') {
6125 nextchar(pRExC_state);
6126 reginsert(pRExC_state, MINMOD, ret, depth+1);
6127 REGTAIL(pRExC_state, ret, ret + NODE_STEP_REGNODE);
6129 #ifndef REG_ALLOW_MINMOD_SUSPEND
6132 if (RExC_parse < RExC_end && *RExC_parse == '+') {
6134 nextchar(pRExC_state);
6135 ender = reg_node(pRExC_state, SUCCEED);
6136 REGTAIL(pRExC_state, ret, ender);
6137 reginsert(pRExC_state, SUSPEND, ret, depth+1);
6139 ender = reg_node(pRExC_state, TAIL);
6140 REGTAIL(pRExC_state, ret, ender);
6144 if (RExC_parse < RExC_end && ISMULT2(RExC_parse)) {
6146 vFAIL("Nested quantifiers");
6153 /* reg_namedseq(pRExC_state,UVp)
6155 This is expected to be called by a parser routine that has
6156 recognized'\N' and needs to handle the rest. RExC_parse is
6157 expected to point at the first char following the N at the time
6160 If valuep is non-null then it is assumed that we are parsing inside
6161 of a charclass definition and the first codepoint in the resolved
6162 string is returned via *valuep and the routine will return NULL.
6163 In this mode if a multichar string is returned from the charnames
6164 handler a warning will be issued, and only the first char in the
6165 sequence will be examined. If the string returned is zero length
6166 then the value of *valuep is undefined and NON-NULL will
6167 be returned to indicate failure. (This will NOT be a valid pointer
6170 If value is null then it is assumed that we are parsing normal text
6171 and inserts a new EXACT node into the program containing the resolved
6172 string and returns a pointer to the new node. If the string is
6173 zerolength a NOTHING node is emitted.
6175 On success RExC_parse is set to the char following the endbrace.
6176 Parsing failures will generate a fatal errorvia vFAIL(...)
6178 NOTE: We cache all results from the charnames handler locally in
6179 the RExC_charnames hash (created on first use) to prevent a charnames
6180 handler from playing silly-buggers and returning a short string and
6181 then a long string for a given pattern. Since the regexp program
6182 size is calculated during an initial parse this would result
6183 in a buffer overrun so we cache to prevent the charname result from
6184 changing during the course of the parse.
6188 S_reg_namedseq(pTHX_ RExC_state_t *pRExC_state, UV *valuep)
6190 char * name; /* start of the content of the name */
6191 char * endbrace; /* endbrace following the name */
6194 STRLEN len; /* this has various purposes throughout the code */
6195 bool cached = 0; /* if this is true then we shouldn't refcount dev sv_str */
6196 regnode *ret = NULL;
6198 if (*RExC_parse != '{') {
6199 vFAIL("Missing braces on \\N{}");
6201 name = RExC_parse+1;
6202 endbrace = strchr(RExC_parse, '}');
6205 vFAIL("Missing right brace on \\N{}");
6207 RExC_parse = endbrace + 1;
6210 /* RExC_parse points at the beginning brace,
6211 endbrace points at the last */
6212 if ( name[0]=='U' && name[1]=='+' ) {
6213 /* its a "unicode hex" notation {U+89AB} */
6214 I32 fl = PERL_SCAN_ALLOW_UNDERSCORES
6215 | PERL_SCAN_DISALLOW_PREFIX
6216 | (SIZE_ONLY ? PERL_SCAN_SILENT_ILLDIGIT : 0);
6218 len = (STRLEN)(endbrace - name - 2);
6219 cp = grok_hex(name + 2, &len, &fl, NULL);
6220 if ( len != (STRLEN)(endbrace - name - 2) ) {
6229 sv_str= Perl_newSVpvf_nocontext("%c",(int)cp);
6231 /* fetch the charnames handler for this scope */
6232 HV * const table = GvHV(PL_hintgv);
6234 hv_fetchs(table, "charnames", FALSE) :
6236 SV *cv= cvp ? *cvp : NULL;
6239 /* create an SV with the name as argument */
6240 sv_name = newSVpvn(name, endbrace - name);
6242 if (!table || !(PL_hints & HINT_LOCALIZE_HH)) {
6243 vFAIL2("Constant(\\N{%s}) unknown: "
6244 "(possibly a missing \"use charnames ...\")",
6247 if (!cvp || !SvOK(*cvp)) { /* when $^H{charnames} = undef; */
6248 vFAIL2("Constant(\\N{%s}): "
6249 "$^H{charnames} is not defined",SvPVX(sv_name));
6254 if (!RExC_charnames) {
6255 /* make sure our cache is allocated */
6256 RExC_charnames = newHV();
6257 sv_2mortal((SV*)RExC_charnames);
6259 /* see if we have looked this one up before */
6260 he_str = hv_fetch_ent( RExC_charnames, sv_name, 0, 0 );
6262 sv_str = HeVAL(he_str);
6275 count= call_sv(cv, G_SCALAR);
6277 if (count == 1) { /* XXXX is this right? dmq */
6279 SvREFCNT_inc_simple_void(sv_str);
6287 if ( !sv_str || !SvOK(sv_str) ) {
6288 vFAIL2("Constant(\\N{%s}): Call to &{$^H{charnames}} "
6289 "did not return a defined value",SvPVX(sv_name));
6291 if (hv_store_ent( RExC_charnames, sv_name, sv_str, 0))
6296 char *p = SvPV(sv_str, len);
6299 if ( SvUTF8(sv_str) ) {
6300 *valuep = utf8_to_uvchr((U8*)p, &numlen);
6304 We have to turn on utf8 for high bit chars otherwise
6305 we get failures with
6307 "ss" =~ /[\N{LATIN SMALL LETTER SHARP S}]/i
6308 "SS" =~ /[\N{LATIN SMALL LETTER SHARP S}]/i
6310 This is different from what \x{} would do with the same
6311 codepoint, where the condition is > 0xFF.
6318 /* warn if we havent used the whole string? */
6320 if (numlen<len && SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6322 "Ignoring excess chars from \\N{%s} in character class",
6326 } else if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6328 "Ignoring zero length \\N{%s} in character class",
6333 SvREFCNT_dec(sv_name);
6335 SvREFCNT_dec(sv_str);
6336 return len ? NULL : (regnode *)&len;
6337 } else if(SvCUR(sv_str)) {
6343 char * parse_start = name-3; /* needed for the offsets */
6345 GET_RE_DEBUG_FLAGS_DECL; /* needed for the offsets */
6347 ret = reg_node(pRExC_state,
6348 (U8)(FOLD ? (LOC ? EXACTFL : EXACTF) : EXACT));
6351 if ( RExC_utf8 && !SvUTF8(sv_str) ) {
6352 sv_utf8_upgrade(sv_str);
6353 } else if ( !RExC_utf8 && SvUTF8(sv_str) ) {
6357 p = SvPV(sv_str, len);
6359 /* len is the length written, charlen is the size the char read */
6360 for ( len = 0; p < pend; p += charlen ) {
6362 UV uvc = utf8_to_uvchr((U8*)p, &charlen);
6364 STRLEN foldlen,numlen;
6365 U8 tmpbuf[UTF8_MAXBYTES_CASE+1], *foldbuf;
6366 uvc = toFOLD_uni(uvc, tmpbuf, &foldlen);
6367 /* Emit all the Unicode characters. */
6369 for (foldbuf = tmpbuf;
6373 uvc = utf8_to_uvchr(foldbuf, &numlen);
6375 const STRLEN unilen = reguni(pRExC_state, uvc, s);
6378 /* In EBCDIC the numlen
6379 * and unilen can differ. */
6381 if (numlen >= foldlen)
6385 break; /* "Can't happen." */
6388 const STRLEN unilen = reguni(pRExC_state, uvc, s);
6400 RExC_size += STR_SZ(len);
6403 RExC_emit += STR_SZ(len);
6405 Set_Node_Cur_Length(ret); /* MJD */
6407 nextchar(pRExC_state);
6409 ret = reg_node(pRExC_state,NOTHING);
6412 SvREFCNT_dec(sv_str);
6415 SvREFCNT_dec(sv_name);
6425 * It returns the code point in utf8 for the value in *encp.
6426 * value: a code value in the source encoding
6427 * encp: a pointer to an Encode object
6429 * If the result from Encode is not a single character,
6430 * it returns U+FFFD (Replacement character) and sets *encp to NULL.
6433 S_reg_recode(pTHX_ const char value, SV **encp)
6436 SV * const sv = sv_2mortal(newSVpvn(&value, numlen));
6437 const char * const s = encp && *encp ? sv_recode_to_utf8(sv, *encp)
6439 const STRLEN newlen = SvCUR(sv);
6440 UV uv = UNICODE_REPLACEMENT;
6444 ? utf8n_to_uvchr((U8*)s, newlen, &numlen, UTF8_ALLOW_DEFAULT)
6447 if (!newlen || numlen != newlen) {
6448 uv = UNICODE_REPLACEMENT;
6457 - regatom - the lowest level
6459 Try to identify anything special at the start of the pattern. If there
6460 is, then handle it as required. This may involve generating a single regop,
6461 such as for an assertion; or it may involve recursing, such as to
6462 handle a () structure.
6464 If the string doesn't start with something special then we gobble up
6465 as much literal text as we can.
6467 Once we have been able to handle whatever type of thing started the
6468 sequence, we return.
6470 Note: we have to be careful with escapes, as they can be both literal
6471 and special, and in the case of \10 and friends can either, depending
6472 on context. Specifically there are two seperate switches for handling
6473 escape sequences, with the one for handling literal escapes requiring
6474 a dummy entry for all of the special escapes that are actually handled
6479 S_regatom(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
6482 register regnode *ret = NULL;
6484 char *parse_start = RExC_parse;
6485 GET_RE_DEBUG_FLAGS_DECL;
6486 DEBUG_PARSE("atom");
6487 *flagp = WORST; /* Tentatively. */
6491 switch ((U8)*RExC_parse) {
6493 RExC_seen_zerolen++;
6494 nextchar(pRExC_state);
6495 if (RExC_flags & RXf_PMf_MULTILINE)
6496 ret = reg_node(pRExC_state, MBOL);
6497 else if (RExC_flags & RXf_PMf_SINGLELINE)
6498 ret = reg_node(pRExC_state, SBOL);
6500 ret = reg_node(pRExC_state, BOL);
6501 Set_Node_Length(ret, 1); /* MJD */
6504 nextchar(pRExC_state);
6506 RExC_seen_zerolen++;
6507 if (RExC_flags & RXf_PMf_MULTILINE)
6508 ret = reg_node(pRExC_state, MEOL);
6509 else if (RExC_flags & RXf_PMf_SINGLELINE)
6510 ret = reg_node(pRExC_state, SEOL);
6512 ret = reg_node(pRExC_state, EOL);
6513 Set_Node_Length(ret, 1); /* MJD */
6516 nextchar(pRExC_state);
6517 if (RExC_flags & RXf_PMf_SINGLELINE)
6518 ret = reg_node(pRExC_state, SANY);
6520 ret = reg_node(pRExC_state, REG_ANY);
6521 *flagp |= HASWIDTH|SIMPLE;
6523 Set_Node_Length(ret, 1); /* MJD */
6527 char * const oregcomp_parse = ++RExC_parse;
6528 ret = regclass(pRExC_state,depth+1);
6529 if (*RExC_parse != ']') {
6530 RExC_parse = oregcomp_parse;
6531 vFAIL("Unmatched [");
6533 nextchar(pRExC_state);
6534 *flagp |= HASWIDTH|SIMPLE;
6535 Set_Node_Length(ret, RExC_parse - oregcomp_parse + 1); /* MJD */
6539 nextchar(pRExC_state);
6540 ret = reg(pRExC_state, 1, &flags,depth+1);
6542 if (flags & TRYAGAIN) {
6543 if (RExC_parse == RExC_end) {
6544 /* Make parent create an empty node if needed. */
6552 *flagp |= flags&(HASWIDTH|SPSTART|SIMPLE|POSTPONED);
6556 if (flags & TRYAGAIN) {
6560 vFAIL("Internal urp");
6561 /* Supposed to be caught earlier. */
6564 if (!regcurly(RExC_parse)) {
6573 vFAIL("Quantifier follows nothing");
6580 if (cp = what_len_TRICKYFOLD_safe(RExC_parse,RExC_end,UTF,len)) {
6581 *flagp |= HASWIDTH; /* could be SIMPLE too, but needs a handler in regexec.regrepeat */
6582 RExC_parse+=len-1; /* we get one from nextchar() as well. :-( */
6583 ret = reganode(pRExC_state, FOLDCHAR, cp);
6584 Set_Node_Length(ret, 1); /* MJD */
6585 nextchar(pRExC_state); /* kill whitespace under /x */
6593 This switch handles escape sequences that resolve to some kind
6594 of special regop and not to literal text. Escape sequnces that
6595 resolve to literal text are handled below in the switch marked
6598 Every entry in this switch *must* have a corresponding entry
6599 in the literal escape switch. However, the opposite is not
6600 required, as the default for this switch is to jump to the
6601 literal text handling code.
6603 switch (*++RExC_parse) {
6604 /* Special Escapes */
6606 RExC_seen_zerolen++;
6607 ret = reg_node(pRExC_state, SBOL);
6609 goto finish_meta_pat;
6611 ret = reg_node(pRExC_state, GPOS);
6612 RExC_seen |= REG_SEEN_GPOS;
6614 goto finish_meta_pat;
6616 RExC_seen_zerolen++;
6617 ret = reg_node(pRExC_state, KEEPS);
6619 goto finish_meta_pat;
6621 ret = reg_node(pRExC_state, SEOL);
6623 RExC_seen_zerolen++; /* Do not optimize RE away */
6624 goto finish_meta_pat;
6626 ret = reg_node(pRExC_state, EOS);
6628 RExC_seen_zerolen++; /* Do not optimize RE away */
6629 goto finish_meta_pat;
6631 ret = reg_node(pRExC_state, CANY);
6632 RExC_seen |= REG_SEEN_CANY;
6633 *flagp |= HASWIDTH|SIMPLE;
6634 goto finish_meta_pat;
6636 ret = reg_node(pRExC_state, CLUMP);
6638 goto finish_meta_pat;
6640 ret = reg_node(pRExC_state, (U8)(LOC ? ALNUML : ALNUM));
6641 *flagp |= HASWIDTH|SIMPLE;
6642 goto finish_meta_pat;
6644 ret = reg_node(pRExC_state, (U8)(LOC ? NALNUML : NALNUM));
6645 *flagp |= HASWIDTH|SIMPLE;
6646 goto finish_meta_pat;
6648 RExC_seen_zerolen++;
6649 RExC_seen |= REG_SEEN_LOOKBEHIND;
6650 ret = reg_node(pRExC_state, (U8)(LOC ? BOUNDL : BOUND));
6652 goto finish_meta_pat;
6654 RExC_seen_zerolen++;
6655 RExC_seen |= REG_SEEN_LOOKBEHIND;
6656 ret = reg_node(pRExC_state, (U8)(LOC ? NBOUNDL : NBOUND));
6658 goto finish_meta_pat;
6660 ret = reg_node(pRExC_state, (U8)(LOC ? SPACEL : SPACE));
6661 *flagp |= HASWIDTH|SIMPLE;
6662 goto finish_meta_pat;
6664 ret = reg_node(pRExC_state, (U8)(LOC ? NSPACEL : NSPACE));
6665 *flagp |= HASWIDTH|SIMPLE;
6666 goto finish_meta_pat;
6668 ret = reg_node(pRExC_state, DIGIT);
6669 *flagp |= HASWIDTH|SIMPLE;
6670 goto finish_meta_pat;
6672 ret = reg_node(pRExC_state, NDIGIT);
6673 *flagp |= HASWIDTH|SIMPLE;
6674 goto finish_meta_pat;
6676 ret = reg_node(pRExC_state, LNBREAK);
6677 *flagp |= HASWIDTH|SIMPLE;
6678 goto finish_meta_pat;
6680 ret = reg_node(pRExC_state, HORIZWS);
6681 *flagp |= HASWIDTH|SIMPLE;
6682 goto finish_meta_pat;
6684 ret = reg_node(pRExC_state, NHORIZWS);
6685 *flagp |= HASWIDTH|SIMPLE;
6686 goto finish_meta_pat;
6688 ret = reg_node(pRExC_state, VERTWS);
6689 *flagp |= HASWIDTH|SIMPLE;
6690 goto finish_meta_pat;
6692 ret = reg_node(pRExC_state, NVERTWS);
6693 *flagp |= HASWIDTH|SIMPLE;
6695 nextchar(pRExC_state);
6696 Set_Node_Length(ret, 2); /* MJD */
6701 char* const oldregxend = RExC_end;
6703 char* parse_start = RExC_parse - 2;
6706 if (RExC_parse[1] == '{') {
6707 /* a lovely hack--pretend we saw [\pX] instead */
6708 RExC_end = strchr(RExC_parse, '}');
6710 const U8 c = (U8)*RExC_parse;
6712 RExC_end = oldregxend;
6713 vFAIL2("Missing right brace on \\%c{}", c);
6718 RExC_end = RExC_parse + 2;
6719 if (RExC_end > oldregxend)
6720 RExC_end = oldregxend;
6724 ret = regclass(pRExC_state,depth+1);
6726 RExC_end = oldregxend;
6729 Set_Node_Offset(ret, parse_start + 2);
6730 Set_Node_Cur_Length(ret);
6731 nextchar(pRExC_state);
6732 *flagp |= HASWIDTH|SIMPLE;
6736 /* Handle \N{NAME} here and not below because it can be
6737 multicharacter. join_exact() will join them up later on.
6738 Also this makes sure that things like /\N{BLAH}+/ and
6739 \N{BLAH} being multi char Just Happen. dmq*/
6741 ret= reg_namedseq(pRExC_state, NULL);
6743 case 'k': /* Handle \k<NAME> and \k'NAME' */
6746 char ch= RExC_parse[1];
6747 if (ch != '<' && ch != '\'' && ch != '{') {
6749 vFAIL2("Sequence %.2s... not terminated",parse_start);
6751 /* this pretty much dupes the code for (?P=...) in reg(), if
6752 you change this make sure you change that */
6753 char* name_start = (RExC_parse += 2);
6755 SV *sv_dat = reg_scan_name(pRExC_state,
6756 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
6757 ch= (ch == '<') ? '>' : (ch == '{') ? '}' : '\'';
6758 if (RExC_parse == name_start || *RExC_parse != ch)
6759 vFAIL2("Sequence %.3s... not terminated",parse_start);
6762 num = add_data( pRExC_state, 1, "S" );
6763 RExC_rxi->data->data[num]=(void*)sv_dat;
6764 SvREFCNT_inc_simple_void(sv_dat);
6768 ret = reganode(pRExC_state,
6769 (U8)(FOLD ? (LOC ? NREFFL : NREFF) : NREF),
6773 /* override incorrect value set in reganode MJD */
6774 Set_Node_Offset(ret, parse_start+1);
6775 Set_Node_Cur_Length(ret); /* MJD */
6776 nextchar(pRExC_state);
6782 case '1': case '2': case '3': case '4':
6783 case '5': case '6': case '7': case '8': case '9':
6786 bool isg = *RExC_parse == 'g';
6791 if (*RExC_parse == '{') {
6795 if (*RExC_parse == '-') {
6799 if (hasbrace && !isDIGIT(*RExC_parse)) {
6800 if (isrel) RExC_parse--;
6802 goto parse_named_seq;
6804 num = atoi(RExC_parse);
6806 num = RExC_npar - num;
6808 vFAIL("Reference to nonexistent or unclosed group");
6810 if (!isg && num > 9 && num >= RExC_npar)
6813 char * const parse_start = RExC_parse - 1; /* MJD */
6814 while (isDIGIT(*RExC_parse))
6816 if (parse_start == RExC_parse - 1)
6817 vFAIL("Unterminated \\g... pattern");
6819 if (*RExC_parse != '}')
6820 vFAIL("Unterminated \\g{...} pattern");
6824 if (num > (I32)RExC_rx->nparens)
6825 vFAIL("Reference to nonexistent group");
6828 ret = reganode(pRExC_state,
6829 (U8)(FOLD ? (LOC ? REFFL : REFF) : REF),
6833 /* override incorrect value set in reganode MJD */
6834 Set_Node_Offset(ret, parse_start+1);
6835 Set_Node_Cur_Length(ret); /* MJD */
6837 nextchar(pRExC_state);
6842 if (RExC_parse >= RExC_end)
6843 FAIL("Trailing \\");
6846 /* Do not generate "unrecognized" warnings here, we fall
6847 back into the quick-grab loop below */
6854 if (RExC_flags & RXf_PMf_EXTENDED) {
6855 if ( reg_skipcomment( pRExC_state ) )
6862 register STRLEN len;
6867 U8 tmpbuf[UTF8_MAXBYTES_CASE+1], *foldbuf;
6869 parse_start = RExC_parse - 1;
6875 ret = reg_node(pRExC_state,
6876 (U8)(FOLD ? (LOC ? EXACTFL : EXACTF) : EXACT));
6878 for (len = 0, p = RExC_parse - 1;
6879 len < 127 && p < RExC_end;
6882 char * const oldp = p;
6884 if (RExC_flags & RXf_PMf_EXTENDED)
6885 p = regwhite( pRExC_state, p );
6890 if (!FOLD || !is_TRICKYFOLD_safe(p,RExC_end,UTF))
6891 goto normal_default;
6901 /* Literal Escapes Switch
6903 This switch is meant to handle escape sequences that
6904 resolve to a literal character.
6906 Every escape sequence that represents something
6907 else, like an assertion or a char class, is handled
6908 in the switch marked 'Special Escapes' above in this
6909 routine, but also has an entry here as anything that
6910 isn't explicitly mentioned here will be treated as
6911 an unescaped equivalent literal.
6915 /* These are all the special escapes. */
6916 case 'A': /* Start assertion */
6917 case 'b': case 'B': /* Word-boundary assertion*/
6918 case 'C': /* Single char !DANGEROUS! */
6919 case 'd': case 'D': /* digit class */
6920 case 'g': case 'G': /* generic-backref, pos assertion */
6921 case 'h': case 'H': /* HORIZWS */
6922 case 'k': case 'K': /* named backref, keep marker */
6923 case 'N': /* named char sequence */
6924 case 'p': case 'P': /* unicode property */
6925 case 'R': /* LNBREAK */
6926 case 's': case 'S': /* space class */
6927 case 'v': case 'V': /* VERTWS */
6928 case 'w': case 'W': /* word class */
6929 case 'X': /* eXtended Unicode "combining character sequence" */
6930 case 'z': case 'Z': /* End of line/string assertion */
6934 /* Anything after here is an escape that resolves to a
6935 literal. (Except digits, which may or may not)
6954 ender = ASCII_TO_NATIVE('\033');
6958 ender = ASCII_TO_NATIVE('\007');
6963 char* const e = strchr(p, '}');
6967 vFAIL("Missing right brace on \\x{}");
6970 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
6971 | PERL_SCAN_DISALLOW_PREFIX;
6972 STRLEN numlen = e - p - 1;
6973 ender = grok_hex(p + 1, &numlen, &flags, NULL);
6980 I32 flags = PERL_SCAN_DISALLOW_PREFIX;
6982 ender = grok_hex(p, &numlen, &flags, NULL);
6985 if (PL_encoding && ender < 0x100)
6986 goto recode_encoding;
6990 ender = UCHARAT(p++);
6991 ender = toCTRL(ender);
6993 case '0': case '1': case '2': case '3':case '4':
6994 case '5': case '6': case '7': case '8':case '9':
6996 (isDIGIT(p[1]) && atoi(p) >= RExC_npar) ) {
6999 ender = grok_oct(p, &numlen, &flags, NULL);
7006 if (PL_encoding && ender < 0x100)
7007 goto recode_encoding;
7011 SV* enc = PL_encoding;
7012 ender = reg_recode((const char)(U8)ender, &enc);
7013 if (!enc && SIZE_ONLY && ckWARN(WARN_REGEXP))
7014 vWARN(p, "Invalid escape in the specified encoding");
7020 FAIL("Trailing \\");
7023 if (!SIZE_ONLY&& isALPHA(*p) && ckWARN(WARN_REGEXP))
7024 vWARN2(p + 1, "Unrecognized escape \\%c passed through", UCHARAT(p));
7025 goto normal_default;
7030 if (UTF8_IS_START(*p) && UTF) {
7032 ender = utf8n_to_uvchr((U8*)p, RExC_end - p,
7033 &numlen, UTF8_ALLOW_DEFAULT);
7040 if ( RExC_flags & RXf_PMf_EXTENDED)
7041 p = regwhite( pRExC_state, p );
7043 /* Prime the casefolded buffer. */
7044 ender = toFOLD_uni(ender, tmpbuf, &foldlen);
7046 if (p < RExC_end && ISMULT2(p)) { /* Back off on ?+*. */
7051 /* Emit all the Unicode characters. */
7053 for (foldbuf = tmpbuf;
7055 foldlen -= numlen) {
7056 ender = utf8_to_uvchr(foldbuf, &numlen);
7058 const STRLEN unilen = reguni(pRExC_state, ender, s);
7061 /* In EBCDIC the numlen
7062 * and unilen can differ. */
7064 if (numlen >= foldlen)
7068 break; /* "Can't happen." */
7072 const STRLEN unilen = reguni(pRExC_state, ender, s);
7081 REGC((char)ender, s++);
7087 /* Emit all the Unicode characters. */
7089 for (foldbuf = tmpbuf;
7091 foldlen -= numlen) {
7092 ender = utf8_to_uvchr(foldbuf, &numlen);
7094 const STRLEN unilen = reguni(pRExC_state, ender, s);
7097 /* In EBCDIC the numlen
7098 * and unilen can differ. */
7100 if (numlen >= foldlen)
7108 const STRLEN unilen = reguni(pRExC_state, ender, s);
7117 REGC((char)ender, s++);
7121 Set_Node_Cur_Length(ret); /* MJD */
7122 nextchar(pRExC_state);
7124 /* len is STRLEN which is unsigned, need to copy to signed */
7127 vFAIL("Internal disaster");
7131 if (len == 1 && UNI_IS_INVARIANT(ender))
7135 RExC_size += STR_SZ(len);
7138 RExC_emit += STR_SZ(len);
7148 S_regwhite( RExC_state_t *pRExC_state, char *p )
7150 const char *e = RExC_end;
7154 else if (*p == '#') {
7163 RExC_seen |= REG_SEEN_RUN_ON_COMMENT;
7171 /* Parse POSIX character classes: [[:foo:]], [[=foo=]], [[.foo.]].
7172 Character classes ([:foo:]) can also be negated ([:^foo:]).
7173 Returns a named class id (ANYOF_XXX) if successful, -1 otherwise.
7174 Equivalence classes ([=foo=]) and composites ([.foo.]) are parsed,
7175 but trigger failures because they are currently unimplemented. */
7177 #define POSIXCC_DONE(c) ((c) == ':')
7178 #define POSIXCC_NOTYET(c) ((c) == '=' || (c) == '.')
7179 #define POSIXCC(c) (POSIXCC_DONE(c) || POSIXCC_NOTYET(c))
7182 S_regpposixcc(pTHX_ RExC_state_t *pRExC_state, I32 value)
7185 I32 namedclass = OOB_NAMEDCLASS;
7187 if (value == '[' && RExC_parse + 1 < RExC_end &&
7188 /* I smell either [: or [= or [. -- POSIX has been here, right? */
7189 POSIXCC(UCHARAT(RExC_parse))) {
7190 const char c = UCHARAT(RExC_parse);
7191 char* const s = RExC_parse++;
7193 while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != c)
7195 if (RExC_parse == RExC_end)
7196 /* Grandfather lone [:, [=, [. */
7199 const char* const t = RExC_parse++; /* skip over the c */
7202 if (UCHARAT(RExC_parse) == ']') {
7203 const char *posixcc = s + 1;
7204 RExC_parse++; /* skip over the ending ] */
7207 const I32 complement = *posixcc == '^' ? *posixcc++ : 0;
7208 const I32 skip = t - posixcc;
7210 /* Initially switch on the length of the name. */
7213 if (memEQ(posixcc, "word", 4)) /* this is not POSIX, this is the Perl \w */
7214 namedclass = complement ? ANYOF_NALNUM : ANYOF_ALNUM;
7217 /* Names all of length 5. */
7218 /* alnum alpha ascii blank cntrl digit graph lower
7219 print punct space upper */
7220 /* Offset 4 gives the best switch position. */
7221 switch (posixcc[4]) {
7223 if (memEQ(posixcc, "alph", 4)) /* alpha */
7224 namedclass = complement ? ANYOF_NALPHA : ANYOF_ALPHA;
7227 if (memEQ(posixcc, "spac", 4)) /* space */
7228 namedclass = complement ? ANYOF_NPSXSPC : ANYOF_PSXSPC;
7231 if (memEQ(posixcc, "grap", 4)) /* graph */
7232 namedclass = complement ? ANYOF_NGRAPH : ANYOF_GRAPH;
7235 if (memEQ(posixcc, "asci", 4)) /* ascii */
7236 namedclass = complement ? ANYOF_NASCII : ANYOF_ASCII;
7239 if (memEQ(posixcc, "blan", 4)) /* blank */
7240 namedclass = complement ? ANYOF_NBLANK : ANYOF_BLANK;
7243 if (memEQ(posixcc, "cntr", 4)) /* cntrl */
7244 namedclass = complement ? ANYOF_NCNTRL : ANYOF_CNTRL;
7247 if (memEQ(posixcc, "alnu", 4)) /* alnum */
7248 namedclass = complement ? ANYOF_NALNUMC : ANYOF_ALNUMC;
7251 if (memEQ(posixcc, "lowe", 4)) /* lower */
7252 namedclass = complement ? ANYOF_NLOWER : ANYOF_LOWER;
7253 else if (memEQ(posixcc, "uppe", 4)) /* upper */
7254 namedclass = complement ? ANYOF_NUPPER : ANYOF_UPPER;
7257 if (memEQ(posixcc, "digi", 4)) /* digit */
7258 namedclass = complement ? ANYOF_NDIGIT : ANYOF_DIGIT;
7259 else if (memEQ(posixcc, "prin", 4)) /* print */
7260 namedclass = complement ? ANYOF_NPRINT : ANYOF_PRINT;
7261 else if (memEQ(posixcc, "punc", 4)) /* punct */
7262 namedclass = complement ? ANYOF_NPUNCT : ANYOF_PUNCT;
7267 if (memEQ(posixcc, "xdigit", 6))
7268 namedclass = complement ? ANYOF_NXDIGIT : ANYOF_XDIGIT;
7272 if (namedclass == OOB_NAMEDCLASS)
7273 Simple_vFAIL3("POSIX class [:%.*s:] unknown",
7275 assert (posixcc[skip] == ':');
7276 assert (posixcc[skip+1] == ']');
7277 } else if (!SIZE_ONLY) {
7278 /* [[=foo=]] and [[.foo.]] are still future. */
7280 /* adjust RExC_parse so the warning shows after
7282 while (UCHARAT(RExC_parse) && UCHARAT(RExC_parse) != ']')
7284 Simple_vFAIL3("POSIX syntax [%c %c] is reserved for future extensions", c, c);
7287 /* Maternal grandfather:
7288 * "[:" ending in ":" but not in ":]" */
7298 S_checkposixcc(pTHX_ RExC_state_t *pRExC_state)
7301 if (POSIXCC(UCHARAT(RExC_parse))) {
7302 const char *s = RExC_parse;
7303 const char c = *s++;
7307 if (*s && c == *s && s[1] == ']') {
7308 if (ckWARN(WARN_REGEXP))
7310 "POSIX syntax [%c %c] belongs inside character classes",
7313 /* [[=foo=]] and [[.foo.]] are still future. */
7314 if (POSIXCC_NOTYET(c)) {
7315 /* adjust RExC_parse so the error shows after
7317 while (UCHARAT(RExC_parse) && UCHARAT(RExC_parse++) != ']')
7319 Simple_vFAIL3("POSIX syntax [%c %c] is reserved for future extensions", c, c);
7326 #define _C_C_T_(NAME,TEST,WORD) \
7329 ANYOF_CLASS_SET(ret, ANYOF_##NAME); \
7331 for (value = 0; value < 256; value++) \
7333 ANYOF_BITMAP_SET(ret, value); \
7338 case ANYOF_N##NAME: \
7340 ANYOF_CLASS_SET(ret, ANYOF_N##NAME); \
7342 for (value = 0; value < 256; value++) \
7344 ANYOF_BITMAP_SET(ret, value); \
7350 #define _C_C_T_NOLOC_(NAME,TEST,WORD) \
7352 for (value = 0; value < 256; value++) \
7354 ANYOF_BITMAP_SET(ret, value); \
7358 case ANYOF_N##NAME: \
7359 for (value = 0; value < 256; value++) \
7361 ANYOF_BITMAP_SET(ret, value); \
7367 parse a class specification and produce either an ANYOF node that
7368 matches the pattern or if the pattern matches a single char only and
7369 that char is < 256 and we are case insensitive then we produce an
7374 S_regclass(pTHX_ RExC_state_t *pRExC_state, U32 depth)
7377 register UV nextvalue;
7378 register IV prevvalue = OOB_UNICODE;
7379 register IV range = 0;
7380 UV value = 0; /* XXX:dmq: needs to be referenceable (unfortunately) */
7381 register regnode *ret;
7384 char *rangebegin = NULL;
7385 bool need_class = 0;
7388 bool optimize_invert = TRUE;
7389 AV* unicode_alternate = NULL;
7391 UV literal_endpoint = 0;
7393 UV stored = 0; /* number of chars stored in the class */
7395 regnode * const orig_emit = RExC_emit; /* Save the original RExC_emit in
7396 case we need to change the emitted regop to an EXACT. */
7397 const char * orig_parse = RExC_parse;
7398 GET_RE_DEBUG_FLAGS_DECL;
7400 PERL_UNUSED_ARG(depth);
7403 DEBUG_PARSE("clas");
7405 /* Assume we are going to generate an ANYOF node. */
7406 ret = reganode(pRExC_state, ANYOF, 0);
7409 ANYOF_FLAGS(ret) = 0;
7411 if (UCHARAT(RExC_parse) == '^') { /* Complement of range. */
7415 ANYOF_FLAGS(ret) |= ANYOF_INVERT;
7419 RExC_size += ANYOF_SKIP;
7420 listsv = &PL_sv_undef; /* For code scanners: listsv always non-NULL. */
7423 RExC_emit += ANYOF_SKIP;
7425 ANYOF_FLAGS(ret) |= ANYOF_FOLD;
7427 ANYOF_FLAGS(ret) |= ANYOF_LOCALE;
7428 ANYOF_BITMAP_ZERO(ret);
7429 listsv = newSVpvs("# comment\n");
7432 nextvalue = RExC_parse < RExC_end ? UCHARAT(RExC_parse) : 0;
7434 if (!SIZE_ONLY && POSIXCC(nextvalue))
7435 checkposixcc(pRExC_state);
7437 /* allow 1st char to be ] (allowing it to be - is dealt with later) */
7438 if (UCHARAT(RExC_parse) == ']')
7442 while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != ']') {
7446 namedclass = OOB_NAMEDCLASS; /* initialize as illegal */
7449 rangebegin = RExC_parse;
7451 value = utf8n_to_uvchr((U8*)RExC_parse,
7452 RExC_end - RExC_parse,
7453 &numlen, UTF8_ALLOW_DEFAULT);
7454 RExC_parse += numlen;
7457 value = UCHARAT(RExC_parse++);
7459 nextvalue = RExC_parse < RExC_end ? UCHARAT(RExC_parse) : 0;
7460 if (value == '[' && POSIXCC(nextvalue))
7461 namedclass = regpposixcc(pRExC_state, value);
7462 else if (value == '\\') {
7464 value = utf8n_to_uvchr((U8*)RExC_parse,
7465 RExC_end - RExC_parse,
7466 &numlen, UTF8_ALLOW_DEFAULT);
7467 RExC_parse += numlen;
7470 value = UCHARAT(RExC_parse++);
7471 /* Some compilers cannot handle switching on 64-bit integer
7472 * values, therefore value cannot be an UV. Yes, this will
7473 * be a problem later if we want switch on Unicode.
7474 * A similar issue a little bit later when switching on
7475 * namedclass. --jhi */
7476 switch ((I32)value) {
7477 case 'w': namedclass = ANYOF_ALNUM; break;
7478 case 'W': namedclass = ANYOF_NALNUM; break;
7479 case 's': namedclass = ANYOF_SPACE; break;
7480 case 'S': namedclass = ANYOF_NSPACE; break;
7481 case 'd': namedclass = ANYOF_DIGIT; break;
7482 case 'D': namedclass = ANYOF_NDIGIT; break;
7483 case 'v': namedclass = ANYOF_VERTWS; break;
7484 case 'V': namedclass = ANYOF_NVERTWS; break;
7485 case 'h': namedclass = ANYOF_HORIZWS; break;
7486 case 'H': namedclass = ANYOF_NHORIZWS; break;
7487 case 'N': /* Handle \N{NAME} in class */
7489 /* We only pay attention to the first char of
7490 multichar strings being returned. I kinda wonder
7491 if this makes sense as it does change the behaviour
7492 from earlier versions, OTOH that behaviour was broken
7494 UV v; /* value is register so we cant & it /grrr */
7495 if (reg_namedseq(pRExC_state, &v)) {
7505 if (RExC_parse >= RExC_end)
7506 vFAIL2("Empty \\%c{}", (U8)value);
7507 if (*RExC_parse == '{') {
7508 const U8 c = (U8)value;
7509 e = strchr(RExC_parse++, '}');
7511 vFAIL2("Missing right brace on \\%c{}", c);
7512 while (isSPACE(UCHARAT(RExC_parse)))
7514 if (e == RExC_parse)
7515 vFAIL2("Empty \\%c{}", c);
7517 while (isSPACE(UCHARAT(RExC_parse + n - 1)))
7525 if (UCHARAT(RExC_parse) == '^') {
7528 value = value == 'p' ? 'P' : 'p'; /* toggle */
7529 while (isSPACE(UCHARAT(RExC_parse))) {
7534 Perl_sv_catpvf(aTHX_ listsv, "%cutf8::%.*s\n",
7535 (value=='p' ? '+' : '!'), (int)n, RExC_parse);
7538 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
7539 namedclass = ANYOF_MAX; /* no official name, but it's named */
7542 case 'n': value = '\n'; break;
7543 case 'r': value = '\r'; break;
7544 case 't': value = '\t'; break;
7545 case 'f': value = '\f'; break;
7546 case 'b': value = '\b'; break;
7547 case 'e': value = ASCII_TO_NATIVE('\033');break;
7548 case 'a': value = ASCII_TO_NATIVE('\007');break;
7550 if (*RExC_parse == '{') {
7551 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
7552 | PERL_SCAN_DISALLOW_PREFIX;
7553 char * const e = strchr(RExC_parse++, '}');
7555 vFAIL("Missing right brace on \\x{}");
7557 numlen = e - RExC_parse;
7558 value = grok_hex(RExC_parse, &numlen, &flags, NULL);
7562 I32 flags = PERL_SCAN_DISALLOW_PREFIX;
7564 value = grok_hex(RExC_parse, &numlen, &flags, NULL);
7565 RExC_parse += numlen;
7567 if (PL_encoding && value < 0x100)
7568 goto recode_encoding;
7571 value = UCHARAT(RExC_parse++);
7572 value = toCTRL(value);
7574 case '0': case '1': case '2': case '3': case '4':
7575 case '5': case '6': case '7': case '8': case '9':
7579 value = grok_oct(--RExC_parse, &numlen, &flags, NULL);
7580 RExC_parse += numlen;
7581 if (PL_encoding && value < 0x100)
7582 goto recode_encoding;
7587 SV* enc = PL_encoding;
7588 value = reg_recode((const char)(U8)value, &enc);
7589 if (!enc && SIZE_ONLY && ckWARN(WARN_REGEXP))
7591 "Invalid escape in the specified encoding");
7595 if (!SIZE_ONLY && isALPHA(value) && ckWARN(WARN_REGEXP))
7597 "Unrecognized escape \\%c in character class passed through",
7601 } /* end of \blah */
7607 if (namedclass > OOB_NAMEDCLASS) { /* this is a named class \blah */
7609 if (!SIZE_ONLY && !need_class)
7610 ANYOF_CLASS_ZERO(ret);
7614 /* a bad range like a-\d, a-[:digit:] ? */
7617 if (ckWARN(WARN_REGEXP)) {
7619 RExC_parse >= rangebegin ?
7620 RExC_parse - rangebegin : 0;
7622 "False [] range \"%*.*s\"",
7625 if (prevvalue < 256) {
7626 ANYOF_BITMAP_SET(ret, prevvalue);
7627 ANYOF_BITMAP_SET(ret, '-');
7630 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
7631 Perl_sv_catpvf(aTHX_ listsv,
7632 "%04"UVxf"\n%04"UVxf"\n", (UV)prevvalue, (UV) '-');
7636 range = 0; /* this was not a true range */
7642 const char *what = NULL;
7645 if (namedclass > OOB_NAMEDCLASS)
7646 optimize_invert = FALSE;
7647 /* Possible truncation here but in some 64-bit environments
7648 * the compiler gets heartburn about switch on 64-bit values.
7649 * A similar issue a little earlier when switching on value.
7651 switch ((I32)namedclass) {
7652 case _C_C_T_(ALNUM, isALNUM(value), "Word");
7653 case _C_C_T_(ALNUMC, isALNUMC(value), "Alnum");
7654 case _C_C_T_(ALPHA, isALPHA(value), "Alpha");
7655 case _C_C_T_(BLANK, isBLANK(value), "Blank");
7656 case _C_C_T_(CNTRL, isCNTRL(value), "Cntrl");
7657 case _C_C_T_(GRAPH, isGRAPH(value), "Graph");
7658 case _C_C_T_(LOWER, isLOWER(value), "Lower");
7659 case _C_C_T_(PRINT, isPRINT(value), "Print");
7660 case _C_C_T_(PSXSPC, isPSXSPC(value), "Space");
7661 case _C_C_T_(PUNCT, isPUNCT(value), "Punct");
7662 case _C_C_T_(SPACE, isSPACE(value), "SpacePerl");
7663 case _C_C_T_(UPPER, isUPPER(value), "Upper");
7664 case _C_C_T_(XDIGIT, isXDIGIT(value), "XDigit");
7665 case _C_C_T_NOLOC_(VERTWS, is_VERTWS_latin1(&value), "VertSpace");
7666 case _C_C_T_NOLOC_(HORIZWS, is_HORIZWS_latin1(&value), "HorizSpace");
7669 ANYOF_CLASS_SET(ret, ANYOF_ASCII);
7672 for (value = 0; value < 128; value++)
7673 ANYOF_BITMAP_SET(ret, value);
7675 for (value = 0; value < 256; value++) {
7677 ANYOF_BITMAP_SET(ret, value);
7686 ANYOF_CLASS_SET(ret, ANYOF_NASCII);
7689 for (value = 128; value < 256; value++)
7690 ANYOF_BITMAP_SET(ret, value);
7692 for (value = 0; value < 256; value++) {
7693 if (!isASCII(value))
7694 ANYOF_BITMAP_SET(ret, value);
7703 ANYOF_CLASS_SET(ret, ANYOF_DIGIT);
7705 /* consecutive digits assumed */
7706 for (value = '0'; value <= '9'; value++)
7707 ANYOF_BITMAP_SET(ret, value);
7714 ANYOF_CLASS_SET(ret, ANYOF_NDIGIT);
7716 /* consecutive digits assumed */
7717 for (value = 0; value < '0'; value++)
7718 ANYOF_BITMAP_SET(ret, value);
7719 for (value = '9' + 1; value < 256; value++)
7720 ANYOF_BITMAP_SET(ret, value);
7726 /* this is to handle \p and \P */
7729 vFAIL("Invalid [::] class");
7733 /* Strings such as "+utf8::isWord\n" */
7734 Perl_sv_catpvf(aTHX_ listsv, "%cutf8::Is%s\n", yesno, what);
7737 ANYOF_FLAGS(ret) |= ANYOF_CLASS;
7740 } /* end of namedclass \blah */
7743 if (prevvalue > (IV)value) /* b-a */ {
7744 const int w = RExC_parse - rangebegin;
7745 Simple_vFAIL4("Invalid [] range \"%*.*s\"", w, w, rangebegin);
7746 range = 0; /* not a valid range */
7750 prevvalue = value; /* save the beginning of the range */
7751 if (*RExC_parse == '-' && RExC_parse+1 < RExC_end &&
7752 RExC_parse[1] != ']') {
7755 /* a bad range like \w-, [:word:]- ? */
7756 if (namedclass > OOB_NAMEDCLASS) {
7757 if (ckWARN(WARN_REGEXP)) {
7759 RExC_parse >= rangebegin ?
7760 RExC_parse - rangebegin : 0;
7762 "False [] range \"%*.*s\"",
7766 ANYOF_BITMAP_SET(ret, '-');
7768 range = 1; /* yeah, it's a range! */
7769 continue; /* but do it the next time */
7773 /* now is the next time */
7774 /*stored += (value - prevvalue + 1);*/
7776 if (prevvalue < 256) {
7777 const IV ceilvalue = value < 256 ? value : 255;
7780 /* In EBCDIC [\x89-\x91] should include
7781 * the \x8e but [i-j] should not. */
7782 if (literal_endpoint == 2 &&
7783 ((isLOWER(prevvalue) && isLOWER(ceilvalue)) ||
7784 (isUPPER(prevvalue) && isUPPER(ceilvalue))))
7786 if (isLOWER(prevvalue)) {
7787 for (i = prevvalue; i <= ceilvalue; i++)
7789 ANYOF_BITMAP_SET(ret, i);
7791 for (i = prevvalue; i <= ceilvalue; i++)
7793 ANYOF_BITMAP_SET(ret, i);
7798 for (i = prevvalue; i <= ceilvalue; i++) {
7799 if (!ANYOF_BITMAP_TEST(ret,i)) {
7801 ANYOF_BITMAP_SET(ret, i);
7805 if (value > 255 || UTF) {
7806 const UV prevnatvalue = NATIVE_TO_UNI(prevvalue);
7807 const UV natvalue = NATIVE_TO_UNI(value);
7808 stored+=2; /* can't optimize this class */
7809 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
7810 if (prevnatvalue < natvalue) { /* what about > ? */
7811 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\t%04"UVxf"\n",
7812 prevnatvalue, natvalue);
7814 else if (prevnatvalue == natvalue) {
7815 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n", natvalue);
7817 U8 foldbuf[UTF8_MAXBYTES_CASE+1];
7819 const UV f = to_uni_fold(natvalue, foldbuf, &foldlen);
7821 #ifdef EBCDIC /* RD t/uni/fold ff and 6b */
7822 if (RExC_precomp[0] == ':' &&
7823 RExC_precomp[1] == '[' &&
7824 (f == 0xDF || f == 0x92)) {
7825 f = NATIVE_TO_UNI(f);
7828 /* If folding and foldable and a single
7829 * character, insert also the folded version
7830 * to the charclass. */
7832 #ifdef EBCDIC /* RD tunifold ligatures s,t fb05, fb06 */
7833 if ((RExC_precomp[0] == ':' &&
7834 RExC_precomp[1] == '[' &&
7836 (value == 0xFB05 || value == 0xFB06))) ?
7837 foldlen == ((STRLEN)UNISKIP(f) - 1) :
7838 foldlen == (STRLEN)UNISKIP(f) )
7840 if (foldlen == (STRLEN)UNISKIP(f))
7842 Perl_sv_catpvf(aTHX_ listsv,
7845 /* Any multicharacter foldings
7846 * require the following transform:
7847 * [ABCDEF] -> (?:[ABCabcDEFd]|pq|rst)
7848 * where E folds into "pq" and F folds
7849 * into "rst", all other characters
7850 * fold to single characters. We save
7851 * away these multicharacter foldings,
7852 * to be later saved as part of the
7853 * additional "s" data. */
7856 if (!unicode_alternate)
7857 unicode_alternate = newAV();
7858 sv = newSVpvn((char*)foldbuf, foldlen);
7860 av_push(unicode_alternate, sv);
7864 /* If folding and the value is one of the Greek
7865 * sigmas insert a few more sigmas to make the
7866 * folding rules of the sigmas to work right.
7867 * Note that not all the possible combinations
7868 * are handled here: some of them are handled
7869 * by the standard folding rules, and some of
7870 * them (literal or EXACTF cases) are handled
7871 * during runtime in regexec.c:S_find_byclass(). */
7872 if (value == UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA) {
7873 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
7874 (UV)UNICODE_GREEK_CAPITAL_LETTER_SIGMA);
7875 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
7876 (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA);
7878 else if (value == UNICODE_GREEK_CAPITAL_LETTER_SIGMA)
7879 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
7880 (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA);
7885 literal_endpoint = 0;
7889 range = 0; /* this range (if it was one) is done now */
7893 ANYOF_FLAGS(ret) |= ANYOF_LARGE;
7895 RExC_size += ANYOF_CLASS_ADD_SKIP;
7897 RExC_emit += ANYOF_CLASS_ADD_SKIP;
7903 /****** !SIZE_ONLY AFTER HERE *********/
7905 if( stored == 1 && (value < 128 || (value < 256 && !UTF))
7906 && !( ANYOF_FLAGS(ret) & ( ANYOF_FLAGS_ALL ^ ANYOF_FOLD ) )
7908 /* optimize single char class to an EXACT node
7909 but *only* when its not a UTF/high char */
7910 const char * cur_parse= RExC_parse;
7911 RExC_emit = (regnode *)orig_emit;
7912 RExC_parse = (char *)orig_parse;
7913 ret = reg_node(pRExC_state,
7914 (U8)((ANYOF_FLAGS(ret) & ANYOF_FOLD) ? EXACTF : EXACT));
7915 RExC_parse = (char *)cur_parse;
7916 *STRING(ret)= (char)value;
7918 RExC_emit += STR_SZ(1);
7921 /* optimize case-insensitive simple patterns (e.g. /[a-z]/i) */
7922 if ( /* If the only flag is folding (plus possibly inversion). */
7923 ((ANYOF_FLAGS(ret) & (ANYOF_FLAGS_ALL ^ ANYOF_INVERT)) == ANYOF_FOLD)
7925 for (value = 0; value < 256; ++value) {
7926 if (ANYOF_BITMAP_TEST(ret, value)) {
7927 UV fold = PL_fold[value];
7930 ANYOF_BITMAP_SET(ret, fold);
7933 ANYOF_FLAGS(ret) &= ~ANYOF_FOLD;
7936 /* optimize inverted simple patterns (e.g. [^a-z]) */
7937 if (optimize_invert &&
7938 /* If the only flag is inversion. */
7939 (ANYOF_FLAGS(ret) & ANYOF_FLAGS_ALL) == ANYOF_INVERT) {
7940 for (value = 0; value < ANYOF_BITMAP_SIZE; ++value)
7941 ANYOF_BITMAP(ret)[value] ^= ANYOF_FLAGS_ALL;
7942 ANYOF_FLAGS(ret) = ANYOF_UNICODE_ALL;
7945 AV * const av = newAV();
7947 /* The 0th element stores the character class description
7948 * in its textual form: used later (regexec.c:Perl_regclass_swash())
7949 * to initialize the appropriate swash (which gets stored in
7950 * the 1st element), and also useful for dumping the regnode.
7951 * The 2nd element stores the multicharacter foldings,
7952 * used later (regexec.c:S_reginclass()). */
7953 av_store(av, 0, listsv);
7954 av_store(av, 1, NULL);
7955 av_store(av, 2, (SV*)unicode_alternate);
7956 rv = newRV_noinc((SV*)av);
7957 n = add_data(pRExC_state, 1, "s");
7958 RExC_rxi->data->data[n] = (void*)rv;
7966 /* reg_skipcomment()
7968 Absorbs an /x style # comments from the input stream.
7969 Returns true if there is more text remaining in the stream.
7970 Will set the REG_SEEN_RUN_ON_COMMENT flag if the comment
7971 terminates the pattern without including a newline.
7973 Note its the callers responsibility to ensure that we are
7979 S_reg_skipcomment(pTHX_ RExC_state_t *pRExC_state)
7982 while (RExC_parse < RExC_end)
7983 if (*RExC_parse++ == '\n') {
7988 /* we ran off the end of the pattern without ending
7989 the comment, so we have to add an \n when wrapping */
7990 RExC_seen |= REG_SEEN_RUN_ON_COMMENT;
7998 Advance that parse position, and optionall absorbs
7999 "whitespace" from the inputstream.
8001 Without /x "whitespace" means (?#...) style comments only,
8002 with /x this means (?#...) and # comments and whitespace proper.
8004 Returns the RExC_parse point from BEFORE the scan occurs.
8006 This is the /x friendly way of saying RExC_parse++.
8010 S_nextchar(pTHX_ RExC_state_t *pRExC_state)
8012 char* const retval = RExC_parse++;
8015 if (*RExC_parse == '(' && RExC_parse[1] == '?' &&
8016 RExC_parse[2] == '#') {
8017 while (*RExC_parse != ')') {
8018 if (RExC_parse == RExC_end)
8019 FAIL("Sequence (?#... not terminated");
8025 if (RExC_flags & RXf_PMf_EXTENDED) {
8026 if (isSPACE(*RExC_parse)) {
8030 else if (*RExC_parse == '#') {
8031 if ( reg_skipcomment( pRExC_state ) )
8040 - reg_node - emit a node
8042 STATIC regnode * /* Location. */
8043 S_reg_node(pTHX_ RExC_state_t *pRExC_state, U8 op)
8046 register regnode *ptr;
8047 regnode * const ret = RExC_emit;
8048 GET_RE_DEBUG_FLAGS_DECL;
8051 SIZE_ALIGN(RExC_size);
8055 if (RExC_emit >= RExC_emit_bound)
8056 Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %d", op);
8058 NODE_ALIGN_FILL(ret);
8060 FILL_ADVANCE_NODE(ptr, op);
8061 #ifdef RE_TRACK_PATTERN_OFFSETS
8062 if (RExC_offsets) { /* MJD */
8063 MJD_OFFSET_DEBUG(("%s:%d: (op %s) %s %"UVuf" (len %"UVuf") (max %"UVuf").\n",
8064 "reg_node", __LINE__,
8066 (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0]
8067 ? "Overwriting end of array!\n" : "OK",
8068 (UV)(RExC_emit - RExC_emit_start),
8069 (UV)(RExC_parse - RExC_start),
8070 (UV)RExC_offsets[0]));
8071 Set_Node_Offset(RExC_emit, RExC_parse + (op == END));
8079 - reganode - emit a node with an argument
8081 STATIC regnode * /* Location. */
8082 S_reganode(pTHX_ RExC_state_t *pRExC_state, U8 op, U32 arg)
8085 register regnode *ptr;
8086 regnode * const ret = RExC_emit;
8087 GET_RE_DEBUG_FLAGS_DECL;
8090 SIZE_ALIGN(RExC_size);
8095 assert(2==regarglen[op]+1);
8097 Anything larger than this has to allocate the extra amount.
8098 If we changed this to be:
8100 RExC_size += (1 + regarglen[op]);
8102 then it wouldn't matter. Its not clear what side effect
8103 might come from that so its not done so far.
8108 if (RExC_emit >= RExC_emit_bound)
8109 Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %d", op);
8111 NODE_ALIGN_FILL(ret);
8113 FILL_ADVANCE_NODE_ARG(ptr, op, arg);
8114 #ifdef RE_TRACK_PATTERN_OFFSETS
8115 if (RExC_offsets) { /* MJD */
8116 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
8120 (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0] ?
8121 "Overwriting end of array!\n" : "OK",
8122 (UV)(RExC_emit - RExC_emit_start),
8123 (UV)(RExC_parse - RExC_start),
8124 (UV)RExC_offsets[0]));
8125 Set_Cur_Node_Offset;
8133 - reguni - emit (if appropriate) a Unicode character
8136 S_reguni(pTHX_ const RExC_state_t *pRExC_state, UV uv, char* s)
8139 return SIZE_ONLY ? UNISKIP(uv) : (uvchr_to_utf8((U8*)s, uv) - (U8*)s);
8143 - reginsert - insert an operator in front of already-emitted operand
8145 * Means relocating the operand.
8148 S_reginsert(pTHX_ RExC_state_t *pRExC_state, U8 op, regnode *opnd, U32 depth)
8151 register regnode *src;
8152 register regnode *dst;
8153 register regnode *place;
8154 const int offset = regarglen[(U8)op];
8155 const int size = NODE_STEP_REGNODE + offset;
8156 GET_RE_DEBUG_FLAGS_DECL;
8157 PERL_UNUSED_ARG(depth);
8158 /* (PL_regkind[(U8)op] == CURLY ? EXTRA_STEP_2ARGS : 0); */
8159 DEBUG_PARSE_FMT("inst"," - %s",PL_reg_name[op]);
8168 if (RExC_open_parens) {
8170 /*DEBUG_PARSE_FMT("inst"," - %"IVdf, (IV)RExC_npar);*/
8171 for ( paren=0 ; paren < RExC_npar ; paren++ ) {
8172 if ( RExC_open_parens[paren] >= opnd ) {
8173 /*DEBUG_PARSE_FMT("open"," - %d",size);*/
8174 RExC_open_parens[paren] += size;
8176 /*DEBUG_PARSE_FMT("open"," - %s","ok");*/
8178 if ( RExC_close_parens[paren] >= opnd ) {
8179 /*DEBUG_PARSE_FMT("close"," - %d",size);*/
8180 RExC_close_parens[paren] += size;
8182 /*DEBUG_PARSE_FMT("close"," - %s","ok");*/
8187 while (src > opnd) {
8188 StructCopy(--src, --dst, regnode);
8189 #ifdef RE_TRACK_PATTERN_OFFSETS
8190 if (RExC_offsets) { /* MJD 20010112 */
8191 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s copy %"UVuf" -> %"UVuf" (max %"UVuf").\n",
8195 (UV)(dst - RExC_emit_start) > RExC_offsets[0]
8196 ? "Overwriting end of array!\n" : "OK",
8197 (UV)(src - RExC_emit_start),
8198 (UV)(dst - RExC_emit_start),
8199 (UV)RExC_offsets[0]));
8200 Set_Node_Offset_To_R(dst-RExC_emit_start, Node_Offset(src));
8201 Set_Node_Length_To_R(dst-RExC_emit_start, Node_Length(src));
8207 place = opnd; /* Op node, where operand used to be. */
8208 #ifdef RE_TRACK_PATTERN_OFFSETS
8209 if (RExC_offsets) { /* MJD */
8210 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
8214 (UV)(place - RExC_emit_start) > RExC_offsets[0]
8215 ? "Overwriting end of array!\n" : "OK",
8216 (UV)(place - RExC_emit_start),
8217 (UV)(RExC_parse - RExC_start),
8218 (UV)RExC_offsets[0]));
8219 Set_Node_Offset(place, RExC_parse);
8220 Set_Node_Length(place, 1);
8223 src = NEXTOPER(place);
8224 FILL_ADVANCE_NODE(place, op);
8225 Zero(src, offset, regnode);
8229 - regtail - set the next-pointer at the end of a node chain of p to val.
8230 - SEE ALSO: regtail_study
8232 /* TODO: All three parms should be const */
8234 S_regtail(pTHX_ RExC_state_t *pRExC_state, regnode *p, const regnode *val,U32 depth)
8237 register regnode *scan;
8238 GET_RE_DEBUG_FLAGS_DECL;
8240 PERL_UNUSED_ARG(depth);
8246 /* Find last node. */
8249 regnode * const temp = regnext(scan);
8251 SV * const mysv=sv_newmortal();
8252 DEBUG_PARSE_MSG((scan==p ? "tail" : ""));
8253 regprop(RExC_rx, mysv, scan);
8254 PerlIO_printf(Perl_debug_log, "~ %s (%d) %s %s\n",
8255 SvPV_nolen_const(mysv), REG_NODE_NUM(scan),
8256 (temp == NULL ? "->" : ""),
8257 (temp == NULL ? PL_reg_name[OP(val)] : "")
8265 if (reg_off_by_arg[OP(scan)]) {
8266 ARG_SET(scan, val - scan);
8269 NEXT_OFF(scan) = val - scan;
8275 - regtail_study - set the next-pointer at the end of a node chain of p to val.
8276 - Look for optimizable sequences at the same time.
8277 - currently only looks for EXACT chains.
8279 This is expermental code. The idea is to use this routine to perform
8280 in place optimizations on branches and groups as they are constructed,
8281 with the long term intention of removing optimization from study_chunk so
8282 that it is purely analytical.
8284 Currently only used when in DEBUG mode. The macro REGTAIL_STUDY() is used
8285 to control which is which.
8288 /* TODO: All four parms should be const */
8291 S_regtail_study(pTHX_ RExC_state_t *pRExC_state, regnode *p, const regnode *val,U32 depth)
8294 register regnode *scan;
8296 #ifdef EXPERIMENTAL_INPLACESCAN
8300 GET_RE_DEBUG_FLAGS_DECL;
8306 /* Find last node. */
8310 regnode * const temp = regnext(scan);
8311 #ifdef EXPERIMENTAL_INPLACESCAN
8312 if (PL_regkind[OP(scan)] == EXACT)
8313 if (join_exact(pRExC_state,scan,&min,1,val,depth+1))
8321 if( exact == PSEUDO )
8323 else if ( exact != OP(scan) )
8332 SV * const mysv=sv_newmortal();
8333 DEBUG_PARSE_MSG((scan==p ? "tsdy" : ""));
8334 regprop(RExC_rx, mysv, scan);
8335 PerlIO_printf(Perl_debug_log, "~ %s (%d) -> %s\n",
8336 SvPV_nolen_const(mysv),
8338 PL_reg_name[exact]);
8345 SV * const mysv_val=sv_newmortal();
8346 DEBUG_PARSE_MSG("");
8347 regprop(RExC_rx, mysv_val, val);
8348 PerlIO_printf(Perl_debug_log, "~ attach to %s (%"IVdf") offset to %"IVdf"\n",
8349 SvPV_nolen_const(mysv_val),
8350 (IV)REG_NODE_NUM(val),
8354 if (reg_off_by_arg[OP(scan)]) {
8355 ARG_SET(scan, val - scan);
8358 NEXT_OFF(scan) = val - scan;
8366 - regcurly - a little FSA that accepts {\d+,?\d*}
8369 S_regcurly(register const char *s)
8388 - regdump - dump a regexp onto Perl_debug_log in vaguely comprehensible form
8391 Perl_regdump(pTHX_ const regexp *r)
8395 SV * const sv = sv_newmortal();
8396 SV *dsv= sv_newmortal();
8399 (void)dumpuntil(r, ri->program, ri->program + 1, NULL, NULL, sv, 0, 0);
8401 /* Header fields of interest. */
8402 if (r->anchored_substr) {
8403 RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->anchored_substr),
8404 RE_SV_DUMPLEN(r->anchored_substr), 30);
8405 PerlIO_printf(Perl_debug_log,
8406 "anchored %s%s at %"IVdf" ",
8407 s, RE_SV_TAIL(r->anchored_substr),
8408 (IV)r->anchored_offset);
8409 } else if (r->anchored_utf8) {
8410 RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->anchored_utf8),
8411 RE_SV_DUMPLEN(r->anchored_utf8), 30);
8412 PerlIO_printf(Perl_debug_log,
8413 "anchored utf8 %s%s at %"IVdf" ",
8414 s, RE_SV_TAIL(r->anchored_utf8),
8415 (IV)r->anchored_offset);
8417 if (r->float_substr) {
8418 RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->float_substr),
8419 RE_SV_DUMPLEN(r->float_substr), 30);
8420 PerlIO_printf(Perl_debug_log,
8421 "floating %s%s at %"IVdf"..%"UVuf" ",
8422 s, RE_SV_TAIL(r->float_substr),
8423 (IV)r->float_min_offset, (UV)r->float_max_offset);
8424 } else if (r->float_utf8) {
8425 RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->float_utf8),
8426 RE_SV_DUMPLEN(r->float_utf8), 30);
8427 PerlIO_printf(Perl_debug_log,
8428 "floating utf8 %s%s at %"IVdf"..%"UVuf" ",
8429 s, RE_SV_TAIL(r->float_utf8),
8430 (IV)r->float_min_offset, (UV)r->float_max_offset);
8432 if (r->check_substr || r->check_utf8)
8433 PerlIO_printf(Perl_debug_log,
8435 (r->check_substr == r->float_substr
8436 && r->check_utf8 == r->float_utf8
8437 ? "(checking floating" : "(checking anchored"));
8438 if (r->extflags & RXf_NOSCAN)
8439 PerlIO_printf(Perl_debug_log, " noscan");
8440 if (r->extflags & RXf_CHECK_ALL)
8441 PerlIO_printf(Perl_debug_log, " isall");
8442 if (r->check_substr || r->check_utf8)
8443 PerlIO_printf(Perl_debug_log, ") ");
8445 if (ri->regstclass) {
8446 regprop(r, sv, ri->regstclass);
8447 PerlIO_printf(Perl_debug_log, "stclass %s ", SvPVX_const(sv));
8449 if (r->extflags & RXf_ANCH) {
8450 PerlIO_printf(Perl_debug_log, "anchored");
8451 if (r->extflags & RXf_ANCH_BOL)
8452 PerlIO_printf(Perl_debug_log, "(BOL)");
8453 if (r->extflags & RXf_ANCH_MBOL)
8454 PerlIO_printf(Perl_debug_log, "(MBOL)");
8455 if (r->extflags & RXf_ANCH_SBOL)
8456 PerlIO_printf(Perl_debug_log, "(SBOL)");
8457 if (r->extflags & RXf_ANCH_GPOS)
8458 PerlIO_printf(Perl_debug_log, "(GPOS)");
8459 PerlIO_putc(Perl_debug_log, ' ');
8461 if (r->extflags & RXf_GPOS_SEEN)
8462 PerlIO_printf(Perl_debug_log, "GPOS:%"UVuf" ", (UV)r->gofs);
8463 if (r->intflags & PREGf_SKIP)
8464 PerlIO_printf(Perl_debug_log, "plus ");
8465 if (r->intflags & PREGf_IMPLICIT)
8466 PerlIO_printf(Perl_debug_log, "implicit ");
8467 PerlIO_printf(Perl_debug_log, "minlen %"IVdf" ", (IV)r->minlen);
8468 if (r->extflags & RXf_EVAL_SEEN)
8469 PerlIO_printf(Perl_debug_log, "with eval ");
8470 PerlIO_printf(Perl_debug_log, "\n");
8472 PERL_UNUSED_CONTEXT;
8474 #endif /* DEBUGGING */
8478 - regprop - printable representation of opcode
8481 Perl_regprop(pTHX_ const regexp *prog, SV *sv, const regnode *o)
8486 RXi_GET_DECL(prog,progi);
8487 GET_RE_DEBUG_FLAGS_DECL;
8490 sv_setpvn(sv, "", 0);
8492 if (OP(o) > REGNODE_MAX) /* regnode.type is unsigned */
8493 /* It would be nice to FAIL() here, but this may be called from
8494 regexec.c, and it would be hard to supply pRExC_state. */
8495 Perl_croak(aTHX_ "Corrupted regexp opcode %d > %d", (int)OP(o), (int)REGNODE_MAX);
8496 sv_catpv(sv, PL_reg_name[OP(o)]); /* Take off const! */
8498 k = PL_regkind[OP(o)];
8501 SV * const dsv = sv_2mortal(newSVpvs(""));
8502 /* Using is_utf8_string() (via PERL_PV_UNI_DETECT)
8503 * is a crude hack but it may be the best for now since
8504 * we have no flag "this EXACTish node was UTF-8"
8506 const char * const s =
8507 pv_pretty(dsv, STRING(o), STR_LEN(o), 60,
8508 PL_colors[0], PL_colors[1],
8509 PERL_PV_ESCAPE_UNI_DETECT |
8510 PERL_PV_PRETTY_ELIPSES |
8513 Perl_sv_catpvf(aTHX_ sv, " %s", s );
8514 } else if (k == TRIE) {
8515 /* print the details of the trie in dumpuntil instead, as
8516 * progi->data isn't available here */
8517 const char op = OP(o);
8518 const U32 n = ARG(o);
8519 const reg_ac_data * const ac = IS_TRIE_AC(op) ?
8520 (reg_ac_data *)progi->data->data[n] :
8522 const reg_trie_data * const trie
8523 = (reg_trie_data*)progi->data->data[!IS_TRIE_AC(op) ? n : ac->trie];
8525 Perl_sv_catpvf(aTHX_ sv, "-%s",PL_reg_name[o->flags]);
8526 DEBUG_TRIE_COMPILE_r(
8527 Perl_sv_catpvf(aTHX_ sv,
8528 "<S:%"UVuf"/%"IVdf" W:%"UVuf" L:%"UVuf"/%"UVuf" C:%"UVuf"/%"UVuf">",
8529 (UV)trie->startstate,
8530 (IV)trie->statecount-1, /* -1 because of the unused 0 element */
8531 (UV)trie->wordcount,
8534 (UV)TRIE_CHARCOUNT(trie),
8535 (UV)trie->uniquecharcount
8538 if ( IS_ANYOF_TRIE(op) || trie->bitmap ) {
8540 int rangestart = -1;
8541 U8* bitmap = IS_ANYOF_TRIE(op) ? (U8*)ANYOF_BITMAP(o) : (U8*)TRIE_BITMAP(trie);
8542 Perl_sv_catpvf(aTHX_ sv, "[");
8543 for (i = 0; i <= 256; i++) {
8544 if (i < 256 && BITMAP_TEST(bitmap,i)) {
8545 if (rangestart == -1)
8547 } else if (rangestart != -1) {
8548 if (i <= rangestart + 3)
8549 for (; rangestart < i; rangestart++)
8550 put_byte(sv, rangestart);
8552 put_byte(sv, rangestart);
8554 put_byte(sv, i - 1);
8559 Perl_sv_catpvf(aTHX_ sv, "]");
8562 } else if (k == CURLY) {
8563 if (OP(o) == CURLYM || OP(o) == CURLYN || OP(o) == CURLYX)
8564 Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* Parenth number */
8565 Perl_sv_catpvf(aTHX_ sv, " {%d,%d}", ARG1(o), ARG2(o));
8567 else if (k == WHILEM && o->flags) /* Ordinal/of */
8568 Perl_sv_catpvf(aTHX_ sv, "[%d/%d]", o->flags & 0xf, o->flags>>4);
8569 else if (k == REF || k == OPEN || k == CLOSE || k == GROUPP || OP(o)==ACCEPT) {
8570 Perl_sv_catpvf(aTHX_ sv, "%d", (int)ARG(o)); /* Parenth number */
8571 if ( prog->paren_names ) {
8572 if ( k != REF || OP(o) < NREF) {
8573 AV *list= (AV *)progi->data->data[progi->name_list_idx];
8574 SV **name= av_fetch(list, ARG(o), 0 );
8576 Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
8579 AV *list= (AV *)progi->data->data[ progi->name_list_idx ];
8580 SV *sv_dat=(SV*)progi->data->data[ ARG( o ) ];
8581 I32 *nums=(I32*)SvPVX(sv_dat);
8582 SV **name= av_fetch(list, nums[0], 0 );
8585 for ( n=0; n<SvIVX(sv_dat); n++ ) {
8586 Perl_sv_catpvf(aTHX_ sv, "%s%"IVdf,
8587 (n ? "," : ""), (IV)nums[n]);
8589 Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
8593 } else if (k == GOSUB)
8594 Perl_sv_catpvf(aTHX_ sv, "%d[%+d]", (int)ARG(o),(int)ARG2L(o)); /* Paren and offset */
8595 else if (k == VERB) {
8597 Perl_sv_catpvf(aTHX_ sv, ":%"SVf,
8598 SVfARG((SV*)progi->data->data[ ARG( o ) ]));
8599 } else if (k == LOGICAL)
8600 Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* 2: embedded, otherwise 1 */
8601 else if (k == FOLDCHAR)
8602 Perl_sv_catpvf(aTHX_ sv, "[0x%"UVXf"]",ARG(o) );
8603 else if (k == ANYOF) {
8604 int i, rangestart = -1;
8605 const U8 flags = ANYOF_FLAGS(o);
8607 /* Should be synchronized with * ANYOF_ #xdefines in regcomp.h */
8608 static const char * const anyofs[] = {
8641 if (flags & ANYOF_LOCALE)
8642 sv_catpvs(sv, "{loc}");
8643 if (flags & ANYOF_FOLD)
8644 sv_catpvs(sv, "{i}");
8645 Perl_sv_catpvf(aTHX_ sv, "[%s", PL_colors[0]);
8646 if (flags & ANYOF_INVERT)
8648 for (i = 0; i <= 256; i++) {
8649 if (i < 256 && ANYOF_BITMAP_TEST(o,i)) {
8650 if (rangestart == -1)
8652 } else if (rangestart != -1) {
8653 if (i <= rangestart + 3)
8654 for (; rangestart < i; rangestart++)
8655 put_byte(sv, rangestart);
8657 put_byte(sv, rangestart);
8659 put_byte(sv, i - 1);
8665 if (o->flags & ANYOF_CLASS)
8666 for (i = 0; i < (int)(sizeof(anyofs)/sizeof(char*)); i++)
8667 if (ANYOF_CLASS_TEST(o,i))
8668 sv_catpv(sv, anyofs[i]);
8670 if (flags & ANYOF_UNICODE)
8671 sv_catpvs(sv, "{unicode}");
8672 else if (flags & ANYOF_UNICODE_ALL)
8673 sv_catpvs(sv, "{unicode_all}");
8677 SV * const sw = regclass_swash(prog, o, FALSE, &lv, 0);
8681 U8 s[UTF8_MAXBYTES_CASE+1];
8683 for (i = 0; i <= 256; i++) { /* just the first 256 */
8684 uvchr_to_utf8(s, i);
8686 if (i < 256 && swash_fetch(sw, s, TRUE)) {
8687 if (rangestart == -1)
8689 } else if (rangestart != -1) {
8690 if (i <= rangestart + 3)
8691 for (; rangestart < i; rangestart++) {
8692 const U8 * const e = uvchr_to_utf8(s,rangestart);
8694 for(p = s; p < e; p++)
8698 const U8 *e = uvchr_to_utf8(s,rangestart);
8700 for (p = s; p < e; p++)
8703 e = uvchr_to_utf8(s, i-1);
8704 for (p = s; p < e; p++)
8711 sv_catpvs(sv, "..."); /* et cetera */
8715 char *s = savesvpv(lv);
8716 char * const origs = s;
8718 while (*s && *s != '\n')
8722 const char * const t = ++s;
8740 Perl_sv_catpvf(aTHX_ sv, "%s]", PL_colors[1]);
8742 else if (k == BRANCHJ && (OP(o) == UNLESSM || OP(o) == IFMATCH))
8743 Perl_sv_catpvf(aTHX_ sv, "[%d]", -(o->flags));
8745 PERL_UNUSED_CONTEXT;
8746 PERL_UNUSED_ARG(sv);
8748 PERL_UNUSED_ARG(prog);
8749 #endif /* DEBUGGING */
8753 Perl_re_intuit_string(pTHX_ REGEXP * const prog)
8754 { /* Assume that RE_INTUIT is set */
8756 GET_RE_DEBUG_FLAGS_DECL;
8757 PERL_UNUSED_CONTEXT;
8761 const char * const s = SvPV_nolen_const(prog->check_substr
8762 ? prog->check_substr : prog->check_utf8);
8764 if (!PL_colorset) reginitcolors();
8765 PerlIO_printf(Perl_debug_log,
8766 "%sUsing REx %ssubstr:%s \"%s%.60s%s%s\"\n",
8768 prog->check_substr ? "" : "utf8 ",
8769 PL_colors[5],PL_colors[0],
8772 (strlen(s) > 60 ? "..." : ""));
8775 return prog->check_substr ? prog->check_substr : prog->check_utf8;
8781 handles refcounting and freeing the perl core regexp structure. When
8782 it is necessary to actually free the structure the first thing it
8783 does is call the 'free' method of the regexp_engine associated to to
8784 the regexp, allowing the handling of the void *pprivate; member
8785 first. (This routine is not overridable by extensions, which is why
8786 the extensions free is called first.)
8788 See regdupe and regdupe_internal if you change anything here.
8790 #ifndef PERL_IN_XSUB_RE
8792 Perl_pregfree(pTHX_ struct regexp *r)
8795 GET_RE_DEBUG_FLAGS_DECL;
8797 if (!r || (--r->refcnt > 0))
8800 ReREFCNT_dec(r->mother_re);
8802 CALLREGFREE_PVT(r); /* free the private data */
8804 SvREFCNT_dec(r->paren_names);
8805 Safefree(r->wrapped);
8808 if (r->anchored_substr)
8809 SvREFCNT_dec(r->anchored_substr);
8810 if (r->anchored_utf8)
8811 SvREFCNT_dec(r->anchored_utf8);
8812 if (r->float_substr)
8813 SvREFCNT_dec(r->float_substr);
8815 SvREFCNT_dec(r->float_utf8);
8816 Safefree(r->substrs);
8818 RX_MATCH_COPY_FREE(r);
8819 #ifdef PERL_OLD_COPY_ON_WRITE
8821 SvREFCNT_dec(r->saved_copy);
8830 This is a hacky workaround to the structural issue of match results
8831 being stored in the regexp structure which is in turn stored in
8832 PL_curpm/PL_reg_curpm. The problem is that due to qr// the pattern
8833 could be PL_curpm in multiple contexts, and could require multiple
8834 result sets being associated with the pattern simultaneously, such
8835 as when doing a recursive match with (??{$qr})
8837 The solution is to make a lightweight copy of the regexp structure
8838 when a qr// is returned from the code executed by (??{$qr}) this
8839 lightweight copy doesnt actually own any of its data except for
8840 the starp/end and the actual regexp structure itself.
8846 Perl_reg_temp_copy (pTHX_ struct regexp *r) {
8848 register const I32 npar = r->nparens+1;
8849 (void)ReREFCNT_inc(r);
8850 Newx(ret, 1, regexp);
8851 StructCopy(r, ret, regexp);
8852 Newx(ret->offs, npar, regexp_paren_pair);
8853 Copy(r->offs, ret->offs, npar, regexp_paren_pair);
8856 Newx(ret->substrs, 1, struct reg_substr_data);
8857 StructCopy(r->substrs, ret->substrs, struct reg_substr_data);
8859 SvREFCNT_inc_void(ret->anchored_substr);
8860 SvREFCNT_inc_void(ret->anchored_utf8);
8861 SvREFCNT_inc_void(ret->float_substr);
8862 SvREFCNT_inc_void(ret->float_utf8);
8864 /* check_substr and check_utf8, if non-NULL, point to either their
8865 anchored or float namesakes, and don't hold a second reference. */
8867 RX_MATCH_COPIED_off(ret);
8868 #ifdef PERL_OLD_COPY_ON_WRITE
8869 /* this is broken. */
8871 if (ret->saved_copy)
8872 ret->saved_copy=NULL;
8881 /* regfree_internal()
8883 Free the private data in a regexp. This is overloadable by
8884 extensions. Perl takes care of the regexp structure in pregfree(),
8885 this covers the *pprivate pointer which technically perldoesnt
8886 know about, however of course we have to handle the
8887 regexp_internal structure when no extension is in use.
8889 Note this is called before freeing anything in the regexp
8894 Perl_regfree_internal(pTHX_ struct regexp *r)
8898 GET_RE_DEBUG_FLAGS_DECL;
8904 SV *dsv= sv_newmortal();
8905 RE_PV_QUOTED_DECL(s, (r->extflags & RXf_UTF8),
8906 dsv, r->precomp, r->prelen, 60);
8907 PerlIO_printf(Perl_debug_log,"%sFreeing REx:%s %s\n",
8908 PL_colors[4],PL_colors[5],s);
8911 #ifdef RE_TRACK_PATTERN_OFFSETS
8913 Safefree(ri->u.offsets); /* 20010421 MJD */
8916 int n = ri->data->count;
8917 PAD* new_comppad = NULL;
8922 /* If you add a ->what type here, update the comment in regcomp.h */
8923 switch (ri->data->what[n]) {
8927 SvREFCNT_dec((SV*)ri->data->data[n]);
8930 Safefree(ri->data->data[n]);
8933 new_comppad = (AV*)ri->data->data[n];
8936 if (new_comppad == NULL)
8937 Perl_croak(aTHX_ "panic: pregfree comppad");
8938 PAD_SAVE_LOCAL(old_comppad,
8939 /* Watch out for global destruction's random ordering. */
8940 (SvTYPE(new_comppad) == SVt_PVAV) ? new_comppad : NULL
8943 refcnt = OpREFCNT_dec((OP_4tree*)ri->data->data[n]);
8946 op_free((OP_4tree*)ri->data->data[n]);
8948 PAD_RESTORE_LOCAL(old_comppad);
8949 SvREFCNT_dec((SV*)new_comppad);
8955 { /* Aho Corasick add-on structure for a trie node.
8956 Used in stclass optimization only */
8958 reg_ac_data *aho=(reg_ac_data*)ri->data->data[n];
8960 refcount = --aho->refcount;
8963 PerlMemShared_free(aho->states);
8964 PerlMemShared_free(aho->fail);
8965 /* do this last!!!! */
8966 PerlMemShared_free(ri->data->data[n]);
8967 PerlMemShared_free(ri->regstclass);
8973 /* trie structure. */
8975 reg_trie_data *trie=(reg_trie_data*)ri->data->data[n];
8977 refcount = --trie->refcount;
8980 PerlMemShared_free(trie->charmap);
8981 PerlMemShared_free(trie->states);
8982 PerlMemShared_free(trie->trans);
8984 PerlMemShared_free(trie->bitmap);
8986 PerlMemShared_free(trie->wordlen);
8988 PerlMemShared_free(trie->jump);
8990 PerlMemShared_free(trie->nextword);
8991 /* do this last!!!! */
8992 PerlMemShared_free(ri->data->data[n]);
8997 Perl_croak(aTHX_ "panic: regfree data code '%c'", ri->data->what[n]);
9000 Safefree(ri->data->what);
9007 #define sv_dup_inc(s,t) SvREFCNT_inc(sv_dup(s,t))
9008 #define av_dup_inc(s,t) (AV*)SvREFCNT_inc(sv_dup((SV*)s,t))
9009 #define hv_dup_inc(s,t) (HV*)SvREFCNT_inc(sv_dup((SV*)s,t))
9010 #define SAVEPVN(p,n) ((p) ? savepvn(p,n) : NULL)
9013 re_dup - duplicate a regexp.
9015 This routine is expected to clone a given regexp structure. It is not
9016 compiler under USE_ITHREADS.
9018 After all of the core data stored in struct regexp is duplicated
9019 the regexp_engine.dupe method is used to copy any private data
9020 stored in the *pprivate pointer. This allows extensions to handle
9021 any duplication it needs to do.
9023 See pregfree() and regfree_internal() if you change anything here.
9025 #if defined(USE_ITHREADS)
9026 #ifndef PERL_IN_XSUB_RE
9028 Perl_re_dup(pTHX_ const regexp *r, CLONE_PARAMS *param)
9035 return (REGEXP *)NULL;
9037 if ((ret = (REGEXP *)ptr_table_fetch(PL_ptr_table, r)))
9041 npar = r->nparens+1;
9042 Newx(ret, 1, regexp);
9043 StructCopy(r, ret, regexp);
9044 Newx(ret->offs, npar, regexp_paren_pair);
9045 Copy(r->offs, ret->offs, npar, regexp_paren_pair);
9047 /* no need to copy these */
9048 Newx(ret->swap, npar, regexp_paren_pair);
9052 /* Do it this way to avoid reading from *r after the StructCopy().
9053 That way, if any of the sv_dup_inc()s dislodge *r from the L1
9054 cache, it doesn't matter. */
9055 const bool anchored = r->check_substr == r->anchored_substr;
9056 Newx(ret->substrs, 1, struct reg_substr_data);
9057 StructCopy(r->substrs, ret->substrs, struct reg_substr_data);
9059 ret->anchored_substr = sv_dup_inc(ret->anchored_substr, param);
9060 ret->anchored_utf8 = sv_dup_inc(ret->anchored_utf8, param);
9061 ret->float_substr = sv_dup_inc(ret->float_substr, param);
9062 ret->float_utf8 = sv_dup_inc(ret->float_utf8, param);
9064 /* check_substr and check_utf8, if non-NULL, point to either their
9065 anchored or float namesakes, and don't hold a second reference. */
9067 if (ret->check_substr) {
9069 assert(r->check_utf8 == r->anchored_utf8);
9070 ret->check_substr = ret->anchored_substr;
9071 ret->check_utf8 = ret->anchored_utf8;
9073 assert(r->check_substr == r->float_substr);
9074 assert(r->check_utf8 == r->float_utf8);
9075 ret->check_substr = ret->float_substr;
9076 ret->check_utf8 = ret->float_utf8;
9081 ret->wrapped = SAVEPVN(ret->wrapped, ret->wraplen+1);
9082 ret->precomp = ret->wrapped + (ret->precomp - ret->wrapped);
9083 ret->paren_names = hv_dup_inc(ret->paren_names, param);
9086 RXi_SET(ret,CALLREGDUPE_PVT(ret,param));
9088 if (RX_MATCH_COPIED(ret))
9089 ret->subbeg = SAVEPVN(ret->subbeg, ret->sublen);
9092 #ifdef PERL_OLD_COPY_ON_WRITE
9093 ret->saved_copy = NULL;
9096 ret->mother_re = NULL;
9098 ret->seen_evals = 0;
9100 ptr_table_store(PL_ptr_table, r, ret);
9103 #endif /* PERL_IN_XSUB_RE */
9108 This is the internal complement to regdupe() which is used to copy
9109 the structure pointed to by the *pprivate pointer in the regexp.
9110 This is the core version of the extension overridable cloning hook.
9111 The regexp structure being duplicated will be copied by perl prior
9112 to this and will be provided as the regexp *r argument, however
9113 with the /old/ structures pprivate pointer value. Thus this routine
9114 may override any copying normally done by perl.
9116 It returns a pointer to the new regexp_internal structure.
9120 Perl_regdupe_internal(pTHX_ REGEXP * const r, CLONE_PARAMS *param)
9123 regexp_internal *reti;
9127 npar = r->nparens+1;
9130 Newxc(reti, sizeof(regexp_internal) + (len+1)*sizeof(regnode), char, regexp_internal);
9131 Copy(ri->program, reti->program, len+1, regnode);
9134 reti->regstclass = NULL;
9138 const int count = ri->data->count;
9141 Newxc(d, sizeof(struct reg_data) + count*sizeof(void *),
9142 char, struct reg_data);
9143 Newx(d->what, count, U8);
9146 for (i = 0; i < count; i++) {
9147 d->what[i] = ri->data->what[i];
9148 switch (d->what[i]) {
9149 /* legal options are one of: sSfpontTu
9150 see also regcomp.h and pregfree() */
9153 case 'p': /* actually an AV, but the dup function is identical. */
9154 case 'u': /* actually an HV, but the dup function is identical. */
9155 d->data[i] = sv_dup_inc((SV *)ri->data->data[i], param);
9158 /* This is cheating. */
9159 Newx(d->data[i], 1, struct regnode_charclass_class);
9160 StructCopy(ri->data->data[i], d->data[i],
9161 struct regnode_charclass_class);
9162 reti->regstclass = (regnode*)d->data[i];
9165 /* Compiled op trees are readonly and in shared memory,
9166 and can thus be shared without duplication. */
9168 d->data[i] = (void*)OpREFCNT_inc((OP*)ri->data->data[i]);
9172 /* Trie stclasses are readonly and can thus be shared
9173 * without duplication. We free the stclass in pregfree
9174 * when the corresponding reg_ac_data struct is freed.
9176 reti->regstclass= ri->regstclass;
9180 ((reg_trie_data*)ri->data->data[i])->refcount++;
9184 d->data[i] = ri->data->data[i];
9187 Perl_croak(aTHX_ "panic: re_dup unknown data code '%c'", ri->data->what[i]);
9196 reti->name_list_idx = ri->name_list_idx;
9198 #ifdef RE_TRACK_PATTERN_OFFSETS
9199 if (ri->u.offsets) {
9200 Newx(reti->u.offsets, 2*len+1, U32);
9201 Copy(ri->u.offsets, reti->u.offsets, 2*len+1, U32);
9204 SetProgLen(reti,len);
9210 #endif /* USE_ITHREADS */
9215 converts a regexp embedded in a MAGIC struct to its stringified form,
9216 caching the converted form in the struct and returns the cached
9219 If lp is nonnull then it is used to return the length of the
9222 If flags is nonnull and the returned string contains UTF8 then
9223 (*flags & 1) will be true.
9225 If haseval is nonnull then it is used to return whether the pattern
9228 Normally called via macro:
9230 CALLREG_STRINGIFY(mg,&len,&utf8);
9234 CALLREG_AS_STR(mg,&lp,&flags,&haseval)
9236 See sv_2pv_flags() in sv.c for an example of internal usage.
9239 #ifndef PERL_IN_XSUB_RE
9242 Perl_reg_stringify(pTHX_ MAGIC *mg, STRLEN *lp, U32 *flags, I32 *haseval ) {
9244 const regexp * const re = (regexp *)mg->mg_obj;
9246 *haseval = re->seen_evals;
9248 *flags = ((re->extflags & RXf_UTF8) ? 1 : 0);
9255 - regnext - dig the "next" pointer out of a node
9258 Perl_regnext(pTHX_ register regnode *p)
9261 register I32 offset;
9266 offset = (reg_off_by_arg[OP(p)] ? ARG(p) : NEXT_OFF(p));
9275 S_re_croak2(pTHX_ const char* pat1,const char* pat2,...)
9278 STRLEN l1 = strlen(pat1);
9279 STRLEN l2 = strlen(pat2);
9282 const char *message;
9288 Copy(pat1, buf, l1 , char);
9289 Copy(pat2, buf + l1, l2 , char);
9290 buf[l1 + l2] = '\n';
9291 buf[l1 + l2 + 1] = '\0';
9293 /* ANSI variant takes additional second argument */
9294 va_start(args, pat2);
9298 msv = vmess(buf, &args);
9300 message = SvPV_const(msv,l1);
9303 Copy(message, buf, l1 , char);
9304 buf[l1-1] = '\0'; /* Overwrite \n */
9305 Perl_croak(aTHX_ "%s", buf);
9308 /* XXX Here's a total kludge. But we need to re-enter for swash routines. */
9310 #ifndef PERL_IN_XSUB_RE
9312 Perl_save_re_context(pTHX)
9316 struct re_save_state *state;
9318 SAVEVPTR(PL_curcop);
9319 SSGROW(SAVESTACK_ALLOC_FOR_RE_SAVE_STATE + 1);
9321 state = (struct re_save_state *)(PL_savestack + PL_savestack_ix);
9322 PL_savestack_ix += SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
9323 SSPUSHINT(SAVEt_RE_STATE);
9325 Copy(&PL_reg_state, state, 1, struct re_save_state);
9327 PL_reg_start_tmp = 0;
9328 PL_reg_start_tmpl = 0;
9329 PL_reg_oldsaved = NULL;
9330 PL_reg_oldsavedlen = 0;
9332 PL_reg_leftiter = 0;
9333 PL_reg_poscache = NULL;
9334 PL_reg_poscache_size = 0;
9335 #ifdef PERL_OLD_COPY_ON_WRITE
9339 /* Save $1..$n (#18107: UTF-8 s/(\w+)/uc($1)/e); AMS 20021106. */
9341 const REGEXP * const rx = PM_GETRE(PL_curpm);
9344 for (i = 1; i <= rx->nparens; i++) {
9345 char digits[TYPE_CHARS(long)];
9346 const STRLEN len = my_snprintf(digits, sizeof(digits), "%lu", (long)i);
9347 GV *const *const gvp
9348 = (GV**)hv_fetch(PL_defstash, digits, len, 0);
9351 GV * const gv = *gvp;
9352 if (SvTYPE(gv) == SVt_PVGV && GvSV(gv))
9362 clear_re(pTHX_ void *r)
9365 ReREFCNT_dec((regexp *)r);
9371 S_put_byte(pTHX_ SV *sv, int c)
9373 if (isCNTRL(c) || c == 255 || !isPRINT(c))
9374 Perl_sv_catpvf(aTHX_ sv, "\\%o", c);
9375 else if (c == '-' || c == ']' || c == '\\' || c == '^')
9376 Perl_sv_catpvf(aTHX_ sv, "\\%c", c);
9378 Perl_sv_catpvf(aTHX_ sv, "%c", c);
9382 #define CLEAR_OPTSTART \
9383 if (optstart) STMT_START { \
9384 DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log, " (%"IVdf" nodes)\n", (IV)(node - optstart))); \
9388 #define DUMPUNTIL(b,e) CLEAR_OPTSTART; node=dumpuntil(r,start,(b),(e),last,sv,indent+1,depth+1);
9390 STATIC const regnode *
9391 S_dumpuntil(pTHX_ const regexp *r, const regnode *start, const regnode *node,
9392 const regnode *last, const regnode *plast,
9393 SV* sv, I32 indent, U32 depth)
9396 register U8 op = PSEUDO; /* Arbitrary non-END op. */
9397 register const regnode *next;
9398 const regnode *optstart= NULL;
9401 GET_RE_DEBUG_FLAGS_DECL;
9403 #ifdef DEBUG_DUMPUNTIL
9404 PerlIO_printf(Perl_debug_log, "--- %d : %d - %d - %d\n",indent,node-start,
9405 last ? last-start : 0,plast ? plast-start : 0);
9408 if (plast && plast < last)
9411 while (PL_regkind[op] != END && (!last || node < last)) {
9412 /* While that wasn't END last time... */
9415 if (op == CLOSE || op == WHILEM)
9417 next = regnext((regnode *)node);
9420 if (OP(node) == OPTIMIZED) {
9421 if (!optstart && RE_DEBUG_FLAG(RE_DEBUG_COMPILE_OPTIMISE))
9428 regprop(r, sv, node);
9429 PerlIO_printf(Perl_debug_log, "%4"IVdf":%*s%s", (IV)(node - start),
9430 (int)(2*indent + 1), "", SvPVX_const(sv));
9432 if (OP(node) != OPTIMIZED) {
9433 if (next == NULL) /* Next ptr. */
9434 PerlIO_printf(Perl_debug_log, " (0)");
9435 else if (PL_regkind[(U8)op] == BRANCH && PL_regkind[OP(next)] != BRANCH )
9436 PerlIO_printf(Perl_debug_log, " (FAIL)");
9438 PerlIO_printf(Perl_debug_log, " (%"IVdf")", (IV)(next - start));
9439 (void)PerlIO_putc(Perl_debug_log, '\n');
9443 if (PL_regkind[(U8)op] == BRANCHJ) {
9446 register const regnode *nnode = (OP(next) == LONGJMP
9447 ? regnext((regnode *)next)
9449 if (last && nnode > last)
9451 DUMPUNTIL(NEXTOPER(NEXTOPER(node)), nnode);
9454 else if (PL_regkind[(U8)op] == BRANCH) {
9456 DUMPUNTIL(NEXTOPER(node), next);
9458 else if ( PL_regkind[(U8)op] == TRIE ) {
9459 const regnode *this_trie = node;
9460 const char op = OP(node);
9461 const U32 n = ARG(node);
9462 const reg_ac_data * const ac = op>=AHOCORASICK ?
9463 (reg_ac_data *)ri->data->data[n] :
9465 const reg_trie_data * const trie =
9466 (reg_trie_data*)ri->data->data[op<AHOCORASICK ? n : ac->trie];
9468 AV *const trie_words = (AV *) ri->data->data[n + TRIE_WORDS_OFFSET];
9470 const regnode *nextbranch= NULL;
9472 sv_setpvn(sv, "", 0);
9473 for (word_idx= 0; word_idx < (I32)trie->wordcount; word_idx++) {
9474 SV ** const elem_ptr = av_fetch(trie_words,word_idx,0);
9476 PerlIO_printf(Perl_debug_log, "%*s%s ",
9477 (int)(2*(indent+3)), "",
9478 elem_ptr ? pv_pretty(sv, SvPV_nolen_const(*elem_ptr), SvCUR(*elem_ptr), 60,
9479 PL_colors[0], PL_colors[1],
9480 (SvUTF8(*elem_ptr) ? PERL_PV_ESCAPE_UNI : 0) |
9481 PERL_PV_PRETTY_ELIPSES |
9487 U16 dist= trie->jump[word_idx+1];
9488 PerlIO_printf(Perl_debug_log, "(%"UVuf")\n",
9489 (UV)((dist ? this_trie + dist : next) - start));
9492 nextbranch= this_trie + trie->jump[0];
9493 DUMPUNTIL(this_trie + dist, nextbranch);
9495 if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
9496 nextbranch= regnext((regnode *)nextbranch);
9498 PerlIO_printf(Perl_debug_log, "\n");
9501 if (last && next > last)
9506 else if ( op == CURLY ) { /* "next" might be very big: optimizer */
9507 DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS,
9508 NEXTOPER(node) + EXTRA_STEP_2ARGS + 1);
9510 else if (PL_regkind[(U8)op] == CURLY && op != CURLYX) {
9512 DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS, next);
9514 else if ( op == PLUS || op == STAR) {
9515 DUMPUNTIL(NEXTOPER(node), NEXTOPER(node) + 1);
9517 else if (op == ANYOF) {
9518 /* arglen 1 + class block */
9519 node += 1 + ((ANYOF_FLAGS(node) & ANYOF_LARGE)
9520 ? ANYOF_CLASS_SKIP : ANYOF_SKIP);
9521 node = NEXTOPER(node);
9523 else if (PL_regkind[(U8)op] == EXACT) {
9524 /* Literal string, where present. */
9525 node += NODE_SZ_STR(node) - 1;
9526 node = NEXTOPER(node);
9529 node = NEXTOPER(node);
9530 node += regarglen[(U8)op];
9532 if (op == CURLYX || op == OPEN)
9536 #ifdef DEBUG_DUMPUNTIL
9537 PerlIO_printf(Perl_debug_log, "--- %d\n", (int)indent);
9542 #endif /* DEBUGGING */
9546 * c-indentation-style: bsd
9548 * indent-tabs-mode: t
9551 * ex: set ts=8 sts=4 sw=4 noet:
https://perl5.git.perl.org / perl5.git / blob