5 * 'A fair jaw-cracker dwarf-language must be.' --Samwise Gamgee
7 * [p.285 of _The Lord of the Rings_, II/iii: "The Ring Goes South"]
10 /* This file contains functions for compiling a regular expression. See
11 * also regexec.c which funnily enough, contains functions for executing
12 * a regular expression.
14 * This file is also copied at build time to ext/re/re_comp.c, where
15 * it's built with -DPERL_EXT_RE_BUILD -DPERL_EXT_RE_DEBUG -DPERL_EXT.
16 * This causes the main functions to be compiled under new names and with
17 * debugging support added, which makes "use re 'debug'" work.
20 /* NOTE: this is derived from Henry Spencer's regexp code, and should not
21 * confused with the original package (see point 3 below). Thanks, Henry!
24 /* Additional note: this code is very heavily munged from Henry's version
25 * in places. In some spots I've traded clarity for efficiency, so don't
26 * blame Henry for some of the lack of readability.
29 /* The names of the functions have been changed from regcomp and
30 * regexec to pregcomp and pregexec in order to avoid conflicts
31 * with the POSIX routines of the same names.
34 #ifdef PERL_EXT_RE_BUILD
39 * pregcomp and pregexec -- regsub and regerror are not used in perl
41 * Copyright (c) 1986 by University of Toronto.
42 * Written by Henry Spencer. Not derived from licensed software.
44 * Permission is granted to anyone to use this software for any
45 * purpose on any computer system, and to redistribute it freely,
46 * subject to the following restrictions:
48 * 1. The author is not responsible for the consequences of use of
49 * this software, no matter how awful, even if they arise
52 * 2. The origin of this software must not be misrepresented, either
53 * by explicit claim or by omission.
55 * 3. Altered versions must be plainly marked as such, and must not
56 * be misrepresented as being the original software.
59 **** Alterations to Henry's code are...
61 **** Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
62 **** 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
63 **** by Larry Wall and others
65 **** You may distribute under the terms of either the GNU General Public
66 **** License or the Artistic License, as specified in the README file.
69 * Beware that some of this code is subtly aware of the way operator
70 * precedence is structured in regular expressions. Serious changes in
71 * regular-expression syntax might require a total rethink.
74 #define PERL_IN_REGCOMP_C
77 #ifndef PERL_IN_XSUB_RE
82 #ifdef PERL_IN_XSUB_RE
93 # if defined(BUGGY_MSC6)
94 /* MSC 6.00A breaks on op/regexp.t test 85 unless we turn this off */
95 # pragma optimize("a",off)
96 /* But MSC 6.00A is happy with 'w', for aliases only across function calls*/
97 # pragma optimize("w",on )
98 # endif /* BUGGY_MSC6 */
102 #define STATIC static
105 typedef struct RExC_state_t {
106 U32 flags; /* are we folding, multilining? */
107 char *precomp; /* uncompiled string. */
108 REGEXP *rx_sv; /* The SV that is the regexp. */
109 regexp *rx; /* perl core regexp structure */
110 regexp_internal *rxi; /* internal data for regexp object pprivate field */
111 char *start; /* Start of input for compile */
112 char *end; /* End of input for compile */
113 char *parse; /* Input-scan pointer. */
114 I32 whilem_seen; /* number of WHILEM in this expr */
115 regnode *emit_start; /* Start of emitted-code area */
116 regnode *emit_bound; /* First regnode outside of the allocated space */
117 regnode *emit; /* Code-emit pointer; ®dummy = don't = compiling */
118 I32 naughty; /* How bad is this pattern? */
119 I32 sawback; /* Did we see \1, ...? */
121 I32 size; /* Code size. */
122 I32 npar; /* Capture buffer count, (OPEN). */
123 I32 cpar; /* Capture buffer count, (CLOSE). */
124 I32 nestroot; /* root parens we are in - used by accept */
128 regnode **open_parens; /* pointers to open parens */
129 regnode **close_parens; /* pointers to close parens */
130 regnode *opend; /* END node in program */
131 I32 utf8; /* whether the pattern is utf8 or not */
132 I32 orig_utf8; /* whether the pattern was originally in utf8 */
133 /* XXX use this for future optimisation of case
134 * where pattern must be upgraded to utf8. */
135 HV *paren_names; /* Paren names */
137 regnode **recurse; /* Recurse regops */
138 I32 recurse_count; /* Number of recurse regops */
140 char *starttry; /* -Dr: where regtry was called. */
141 #define RExC_starttry (pRExC_state->starttry)
144 const char *lastparse;
146 AV *paren_name_list; /* idx -> name */
147 #define RExC_lastparse (pRExC_state->lastparse)
148 #define RExC_lastnum (pRExC_state->lastnum)
149 #define RExC_paren_name_list (pRExC_state->paren_name_list)
153 #define RExC_flags (pRExC_state->flags)
154 #define RExC_precomp (pRExC_state->precomp)
155 #define RExC_rx_sv (pRExC_state->rx_sv)
156 #define RExC_rx (pRExC_state->rx)
157 #define RExC_rxi (pRExC_state->rxi)
158 #define RExC_start (pRExC_state->start)
159 #define RExC_end (pRExC_state->end)
160 #define RExC_parse (pRExC_state->parse)
161 #define RExC_whilem_seen (pRExC_state->whilem_seen)
162 #ifdef RE_TRACK_PATTERN_OFFSETS
163 #define RExC_offsets (pRExC_state->rxi->u.offsets) /* I am not like the others */
165 #define RExC_emit (pRExC_state->emit)
166 #define RExC_emit_start (pRExC_state->emit_start)
167 #define RExC_emit_bound (pRExC_state->emit_bound)
168 #define RExC_naughty (pRExC_state->naughty)
169 #define RExC_sawback (pRExC_state->sawback)
170 #define RExC_seen (pRExC_state->seen)
171 #define RExC_size (pRExC_state->size)
172 #define RExC_npar (pRExC_state->npar)
173 #define RExC_nestroot (pRExC_state->nestroot)
174 #define RExC_extralen (pRExC_state->extralen)
175 #define RExC_seen_zerolen (pRExC_state->seen_zerolen)
176 #define RExC_seen_evals (pRExC_state->seen_evals)
177 #define RExC_utf8 (pRExC_state->utf8)
178 #define RExC_orig_utf8 (pRExC_state->orig_utf8)
179 #define RExC_open_parens (pRExC_state->open_parens)
180 #define RExC_close_parens (pRExC_state->close_parens)
181 #define RExC_opend (pRExC_state->opend)
182 #define RExC_paren_names (pRExC_state->paren_names)
183 #define RExC_recurse (pRExC_state->recurse)
184 #define RExC_recurse_count (pRExC_state->recurse_count)
187 #define ISMULT1(c) ((c) == '*' || (c) == '+' || (c) == '?')
188 #define ISMULT2(s) ((*s) == '*' || (*s) == '+' || (*s) == '?' || \
189 ((*s) == '{' && regcurly(s)))
192 #undef SPSTART /* dratted cpp namespace... */
195 * Flags to be passed up and down.
197 #define WORST 0 /* Worst case. */
198 #define HASWIDTH 0x01 /* Known to match non-null strings. */
199 #define SIMPLE 0x02 /* Simple enough to be STAR/PLUS operand. */
200 #define SPSTART 0x04 /* Starts with * or +. */
201 #define TRYAGAIN 0x08 /* Weeded out a declaration. */
202 #define POSTPONED 0x10 /* (?1),(?&name), (??{...}) or similar */
204 #define REG_NODE_NUM(x) ((x) ? (int)((x)-RExC_emit_start) : -1)
206 /* whether trie related optimizations are enabled */
207 #if PERL_ENABLE_EXTENDED_TRIE_OPTIMISATION
208 #define TRIE_STUDY_OPT
209 #define FULL_TRIE_STUDY
215 #define PBYTE(u8str,paren) ((U8*)(u8str))[(paren) >> 3]
216 #define PBITVAL(paren) (1 << ((paren) & 7))
217 #define PAREN_TEST(u8str,paren) ( PBYTE(u8str,paren) & PBITVAL(paren))
218 #define PAREN_SET(u8str,paren) PBYTE(u8str,paren) |= PBITVAL(paren)
219 #define PAREN_UNSET(u8str,paren) PBYTE(u8str,paren) &= (~PBITVAL(paren))
222 /* About scan_data_t.
224 During optimisation we recurse through the regexp program performing
225 various inplace (keyhole style) optimisations. In addition study_chunk
226 and scan_commit populate this data structure with information about
227 what strings MUST appear in the pattern. We look for the longest
228 string that must appear for at a fixed location, and we look for the
229 longest string that may appear at a floating location. So for instance
234 Both 'FOO' and 'A' are fixed strings. Both 'B' and 'BAR' are floating
235 strings (because they follow a .* construct). study_chunk will identify
236 both FOO and BAR as being the longest fixed and floating strings respectively.
238 The strings can be composites, for instance
242 will result in a composite fixed substring 'foo'.
244 For each string some basic information is maintained:
246 - offset or min_offset
247 This is the position the string must appear at, or not before.
248 It also implicitly (when combined with minlenp) tells us how many
249 character must match before the string we are searching.
250 Likewise when combined with minlenp and the length of the string
251 tells us how many characters must appear after the string we have
255 Only used for floating strings. This is the rightmost point that
256 the string can appear at. Ifset to I32 max it indicates that the
257 string can occur infinitely far to the right.
260 A pointer to the minimum length of the pattern that the string
261 was found inside. This is important as in the case of positive
262 lookahead or positive lookbehind we can have multiple patterns
267 The minimum length of the pattern overall is 3, the minimum length
268 of the lookahead part is 3, but the minimum length of the part that
269 will actually match is 1. So 'FOO's minimum length is 3, but the
270 minimum length for the F is 1. This is important as the minimum length
271 is used to determine offsets in front of and behind the string being
272 looked for. Since strings can be composites this is the length of the
273 pattern at the time it was commited with a scan_commit. Note that
274 the length is calculated by study_chunk, so that the minimum lengths
275 are not known until the full pattern has been compiled, thus the
276 pointer to the value.
280 In the case of lookbehind the string being searched for can be
281 offset past the start point of the final matching string.
282 If this value was just blithely removed from the min_offset it would
283 invalidate some of the calculations for how many chars must match
284 before or after (as they are derived from min_offset and minlen and
285 the length of the string being searched for).
286 When the final pattern is compiled and the data is moved from the
287 scan_data_t structure into the regexp structure the information
288 about lookbehind is factored in, with the information that would
289 have been lost precalculated in the end_shift field for the
292 The fields pos_min and pos_delta are used to store the minimum offset
293 and the delta to the maximum offset at the current point in the pattern.
297 typedef struct scan_data_t {
298 /*I32 len_min; unused */
299 /*I32 len_delta; unused */
303 I32 last_end; /* min value, <0 unless valid. */
306 SV **longest; /* Either &l_fixed, or &l_float. */
307 SV *longest_fixed; /* longest fixed string found in pattern */
308 I32 offset_fixed; /* offset where it starts */
309 I32 *minlen_fixed; /* pointer to the minlen relevent to the string */
310 I32 lookbehind_fixed; /* is the position of the string modfied by LB */
311 SV *longest_float; /* longest floating string found in pattern */
312 I32 offset_float_min; /* earliest point in string it can appear */
313 I32 offset_float_max; /* latest point in string it can appear */
314 I32 *minlen_float; /* pointer to the minlen relevent to the string */
315 I32 lookbehind_float; /* is the position of the string modified by LB */
319 struct regnode_charclass_class *start_class;
323 * Forward declarations for pregcomp()'s friends.
326 static const scan_data_t zero_scan_data =
327 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ,0};
329 #define SF_BEFORE_EOL (SF_BEFORE_SEOL|SF_BEFORE_MEOL)
330 #define SF_BEFORE_SEOL 0x0001
331 #define SF_BEFORE_MEOL 0x0002
332 #define SF_FIX_BEFORE_EOL (SF_FIX_BEFORE_SEOL|SF_FIX_BEFORE_MEOL)
333 #define SF_FL_BEFORE_EOL (SF_FL_BEFORE_SEOL|SF_FL_BEFORE_MEOL)
336 # define SF_FIX_SHIFT_EOL (0+2)
337 # define SF_FL_SHIFT_EOL (0+4)
339 # define SF_FIX_SHIFT_EOL (+2)
340 # define SF_FL_SHIFT_EOL (+4)
343 #define SF_FIX_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FIX_SHIFT_EOL)
344 #define SF_FIX_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FIX_SHIFT_EOL)
346 #define SF_FL_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FL_SHIFT_EOL)
347 #define SF_FL_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FL_SHIFT_EOL) /* 0x20 */
348 #define SF_IS_INF 0x0040
349 #define SF_HAS_PAR 0x0080
350 #define SF_IN_PAR 0x0100
351 #define SF_HAS_EVAL 0x0200
352 #define SCF_DO_SUBSTR 0x0400
353 #define SCF_DO_STCLASS_AND 0x0800
354 #define SCF_DO_STCLASS_OR 0x1000
355 #define SCF_DO_STCLASS (SCF_DO_STCLASS_AND|SCF_DO_STCLASS_OR)
356 #define SCF_WHILEM_VISITED_POS 0x2000
358 #define SCF_TRIE_RESTUDY 0x4000 /* Do restudy? */
359 #define SCF_SEEN_ACCEPT 0x8000
361 #define UTF (RExC_utf8 != 0)
362 #define LOC ((RExC_flags & RXf_PMf_LOCALE) != 0)
363 #define FOLD ((RExC_flags & RXf_PMf_FOLD) != 0)
365 #define OOB_UNICODE 12345678
366 #define OOB_NAMEDCLASS -1
368 #define CHR_SVLEN(sv) (UTF ? sv_len_utf8(sv) : SvCUR(sv))
369 #define CHR_DIST(a,b) (UTF ? utf8_distance(a,b) : a - b)
372 /* length of regex to show in messages that don't mark a position within */
373 #define RegexLengthToShowInErrorMessages 127
376 * If MARKER[12] are adjusted, be sure to adjust the constants at the top
377 * of t/op/regmesg.t, the tests in t/op/re_tests, and those in
378 * op/pragma/warn/regcomp.
380 #define MARKER1 "<-- HERE" /* marker as it appears in the description */
381 #define MARKER2 " <-- HERE " /* marker as it appears within the regex */
383 #define REPORT_LOCATION " in regex; marked by " MARKER1 " in m/%.*s" MARKER2 "%s/"
386 * Calls SAVEDESTRUCTOR_X if needed, then calls Perl_croak with the given
387 * arg. Show regex, up to a maximum length. If it's too long, chop and add
390 #define _FAIL(code) STMT_START { \
391 const char *ellipses = ""; \
392 IV len = RExC_end - RExC_precomp; \
395 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx_sv); \
396 if (len > RegexLengthToShowInErrorMessages) { \
397 /* chop 10 shorter than the max, to ensure meaning of "..." */ \
398 len = RegexLengthToShowInErrorMessages - 10; \
404 #define FAIL(msg) _FAIL( \
405 Perl_croak(aTHX_ "%s in regex m/%.*s%s/", \
406 msg, (int)len, RExC_precomp, ellipses))
408 #define FAIL2(msg,arg) _FAIL( \
409 Perl_croak(aTHX_ msg " in regex m/%.*s%s/", \
410 arg, (int)len, RExC_precomp, ellipses))
413 * Simple_vFAIL -- like FAIL, but marks the current location in the scan
415 #define Simple_vFAIL(m) STMT_START { \
416 const IV offset = RExC_parse - RExC_precomp; \
417 Perl_croak(aTHX_ "%s" REPORT_LOCATION, \
418 m, (int)offset, RExC_precomp, RExC_precomp + offset); \
422 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL()
424 #define vFAIL(m) STMT_START { \
426 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx_sv); \
431 * Like Simple_vFAIL(), but accepts two arguments.
433 #define Simple_vFAIL2(m,a1) STMT_START { \
434 const IV offset = RExC_parse - RExC_precomp; \
435 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, \
436 (int)offset, RExC_precomp, RExC_precomp + offset); \
440 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL2().
442 #define vFAIL2(m,a1) STMT_START { \
444 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx_sv); \
445 Simple_vFAIL2(m, a1); \
450 * Like Simple_vFAIL(), but accepts three arguments.
452 #define Simple_vFAIL3(m, a1, a2) STMT_START { \
453 const IV offset = RExC_parse - RExC_precomp; \
454 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, \
455 (int)offset, RExC_precomp, RExC_precomp + offset); \
459 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL3().
461 #define vFAIL3(m,a1,a2) STMT_START { \
463 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx_sv); \
464 Simple_vFAIL3(m, a1, a2); \
468 * Like Simple_vFAIL(), but accepts four arguments.
470 #define Simple_vFAIL4(m, a1, a2, a3) STMT_START { \
471 const IV offset = RExC_parse - RExC_precomp; \
472 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, a3, \
473 (int)offset, RExC_precomp, RExC_precomp + offset); \
476 #define ckWARNreg(loc,m) STMT_START { \
477 const IV offset = loc - RExC_precomp; \
478 Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
479 (int)offset, RExC_precomp, RExC_precomp + offset); \
482 #define ckWARNregdep(loc,m) STMT_START { \
483 const IV offset = loc - RExC_precomp; \
484 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_REGEXP), \
486 (int)offset, RExC_precomp, RExC_precomp + offset); \
489 #define ckWARN2reg(loc, m, a1) STMT_START { \
490 const IV offset = loc - RExC_precomp; \
491 Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
492 a1, (int)offset, RExC_precomp, RExC_precomp + offset); \
495 #define vWARN3(loc, m, a1, a2) STMT_START { \
496 const IV offset = loc - RExC_precomp; \
497 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
498 a1, a2, (int)offset, RExC_precomp, RExC_precomp + offset); \
501 #define ckWARN3reg(loc, m, a1, a2) STMT_START { \
502 const IV offset = loc - RExC_precomp; \
503 Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
504 a1, a2, (int)offset, RExC_precomp, RExC_precomp + offset); \
507 #define vWARN4(loc, m, a1, a2, a3) STMT_START { \
508 const IV offset = loc - RExC_precomp; \
509 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
510 a1, a2, a3, (int)offset, RExC_precomp, RExC_precomp + offset); \
513 #define ckWARN4reg(loc, m, a1, a2, a3) STMT_START { \
514 const IV offset = loc - RExC_precomp; \
515 Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
516 a1, a2, a3, (int)offset, RExC_precomp, RExC_precomp + offset); \
519 #define vWARN5(loc, m, a1, a2, a3, a4) STMT_START { \
520 const IV offset = loc - RExC_precomp; \
521 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
522 a1, a2, a3, a4, (int)offset, RExC_precomp, RExC_precomp + offset); \
526 /* Allow for side effects in s */
527 #define REGC(c,s) STMT_START { \
528 if (!SIZE_ONLY) *(s) = (c); else (void)(s); \
531 /* Macros for recording node offsets. 20001227 mjd@plover.com
532 * Nodes are numbered 1, 2, 3, 4. Node #n's position is recorded in
533 * element 2*n-1 of the array. Element #2n holds the byte length node #n.
534 * Element 0 holds the number n.
535 * Position is 1 indexed.
537 #ifndef RE_TRACK_PATTERN_OFFSETS
538 #define Set_Node_Offset_To_R(node,byte)
539 #define Set_Node_Offset(node,byte)
540 #define Set_Cur_Node_Offset
541 #define Set_Node_Length_To_R(node,len)
542 #define Set_Node_Length(node,len)
543 #define Set_Node_Cur_Length(node)
544 #define Node_Offset(n)
545 #define Node_Length(n)
546 #define Set_Node_Offset_Length(node,offset,len)
547 #define ProgLen(ri) ri->u.proglen
548 #define SetProgLen(ri,x) ri->u.proglen = x
550 #define ProgLen(ri) ri->u.offsets[0]
551 #define SetProgLen(ri,x) ri->u.offsets[0] = x
552 #define Set_Node_Offset_To_R(node,byte) STMT_START { \
554 MJD_OFFSET_DEBUG(("** (%d) offset of node %d is %d.\n", \
555 __LINE__, (int)(node), (int)(byte))); \
557 Perl_croak(aTHX_ "value of node is %d in Offset macro", (int)(node)); \
559 RExC_offsets[2*(node)-1] = (byte); \
564 #define Set_Node_Offset(node,byte) \
565 Set_Node_Offset_To_R((node)-RExC_emit_start, (byte)-RExC_start)
566 #define Set_Cur_Node_Offset Set_Node_Offset(RExC_emit, RExC_parse)
568 #define Set_Node_Length_To_R(node,len) STMT_START { \
570 MJD_OFFSET_DEBUG(("** (%d) size of node %d is %d.\n", \
571 __LINE__, (int)(node), (int)(len))); \
573 Perl_croak(aTHX_ "value of node is %d in Length macro", (int)(node)); \
575 RExC_offsets[2*(node)] = (len); \
580 #define Set_Node_Length(node,len) \
581 Set_Node_Length_To_R((node)-RExC_emit_start, len)
582 #define Set_Cur_Node_Length(len) Set_Node_Length(RExC_emit, len)
583 #define Set_Node_Cur_Length(node) \
584 Set_Node_Length(node, RExC_parse - parse_start)
586 /* Get offsets and lengths */
587 #define Node_Offset(n) (RExC_offsets[2*((n)-RExC_emit_start)-1])
588 #define Node_Length(n) (RExC_offsets[2*((n)-RExC_emit_start)])
590 #define Set_Node_Offset_Length(node,offset,len) STMT_START { \
591 Set_Node_Offset_To_R((node)-RExC_emit_start, (offset)); \
592 Set_Node_Length_To_R((node)-RExC_emit_start, (len)); \
596 #if PERL_ENABLE_EXPERIMENTAL_REGEX_OPTIMISATIONS
597 #define EXPERIMENTAL_INPLACESCAN
598 #endif /*RE_TRACK_PATTERN_OFFSETS*/
600 #define DEBUG_STUDYDATA(str,data,depth) \
601 DEBUG_OPTIMISE_MORE_r(if(data){ \
602 PerlIO_printf(Perl_debug_log, \
603 "%*s" str "Pos:%"IVdf"/%"IVdf \
604 " Flags: 0x%"UVXf" Whilem_c: %"IVdf" Lcp: %"IVdf" %s", \
605 (int)(depth)*2, "", \
606 (IV)((data)->pos_min), \
607 (IV)((data)->pos_delta), \
608 (UV)((data)->flags), \
609 (IV)((data)->whilem_c), \
610 (IV)((data)->last_closep ? *((data)->last_closep) : -1), \
611 is_inf ? "INF " : "" \
613 if ((data)->last_found) \
614 PerlIO_printf(Perl_debug_log, \
615 "Last:'%s' %"IVdf":%"IVdf"/%"IVdf" %sFixed:'%s' @ %"IVdf \
616 " %sFloat: '%s' @ %"IVdf"/%"IVdf"", \
617 SvPVX_const((data)->last_found), \
618 (IV)((data)->last_end), \
619 (IV)((data)->last_start_min), \
620 (IV)((data)->last_start_max), \
621 ((data)->longest && \
622 (data)->longest==&((data)->longest_fixed)) ? "*" : "", \
623 SvPVX_const((data)->longest_fixed), \
624 (IV)((data)->offset_fixed), \
625 ((data)->longest && \
626 (data)->longest==&((data)->longest_float)) ? "*" : "", \
627 SvPVX_const((data)->longest_float), \
628 (IV)((data)->offset_float_min), \
629 (IV)((data)->offset_float_max) \
631 PerlIO_printf(Perl_debug_log,"\n"); \
634 static void clear_re(pTHX_ void *r);
636 /* Mark that we cannot extend a found fixed substring at this point.
637 Update the longest found anchored substring and the longest found
638 floating substrings if needed. */
641 S_scan_commit(pTHX_ const RExC_state_t *pRExC_state, scan_data_t *data, I32 *minlenp, int is_inf)
643 const STRLEN l = CHR_SVLEN(data->last_found);
644 const STRLEN old_l = CHR_SVLEN(*data->longest);
645 GET_RE_DEBUG_FLAGS_DECL;
647 PERL_ARGS_ASSERT_SCAN_COMMIT;
649 if ((l >= old_l) && ((l > old_l) || (data->flags & SF_BEFORE_EOL))) {
650 SvSetMagicSV(*data->longest, data->last_found);
651 if (*data->longest == data->longest_fixed) {
652 data->offset_fixed = l ? data->last_start_min : data->pos_min;
653 if (data->flags & SF_BEFORE_EOL)
655 |= ((data->flags & SF_BEFORE_EOL) << SF_FIX_SHIFT_EOL);
657 data->flags &= ~SF_FIX_BEFORE_EOL;
658 data->minlen_fixed=minlenp;
659 data->lookbehind_fixed=0;
661 else { /* *data->longest == data->longest_float */
662 data->offset_float_min = l ? data->last_start_min : data->pos_min;
663 data->offset_float_max = (l
664 ? data->last_start_max
665 : data->pos_min + data->pos_delta);
666 if (is_inf || (U32)data->offset_float_max > (U32)I32_MAX)
667 data->offset_float_max = I32_MAX;
668 if (data->flags & SF_BEFORE_EOL)
670 |= ((data->flags & SF_BEFORE_EOL) << SF_FL_SHIFT_EOL);
672 data->flags &= ~SF_FL_BEFORE_EOL;
673 data->minlen_float=minlenp;
674 data->lookbehind_float=0;
677 SvCUR_set(data->last_found, 0);
679 SV * const sv = data->last_found;
680 if (SvUTF8(sv) && SvMAGICAL(sv)) {
681 MAGIC * const mg = mg_find(sv, PERL_MAGIC_utf8);
687 data->flags &= ~SF_BEFORE_EOL;
688 DEBUG_STUDYDATA("commit: ",data,0);
691 /* Can match anything (initialization) */
693 S_cl_anything(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
695 PERL_ARGS_ASSERT_CL_ANYTHING;
697 ANYOF_CLASS_ZERO(cl);
698 ANYOF_BITMAP_SETALL(cl);
699 cl->flags = ANYOF_EOS|ANYOF_UNICODE_ALL;
701 cl->flags |= ANYOF_LOCALE;
704 /* Can match anything (initialization) */
706 S_cl_is_anything(const struct regnode_charclass_class *cl)
710 PERL_ARGS_ASSERT_CL_IS_ANYTHING;
712 for (value = 0; value <= ANYOF_MAX; value += 2)
713 if (ANYOF_CLASS_TEST(cl, value) && ANYOF_CLASS_TEST(cl, value + 1))
715 if (!(cl->flags & ANYOF_UNICODE_ALL))
717 if (!ANYOF_BITMAP_TESTALLSET((const void*)cl))
722 /* Can match anything (initialization) */
724 S_cl_init(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
726 PERL_ARGS_ASSERT_CL_INIT;
728 Zero(cl, 1, struct regnode_charclass_class);
730 cl_anything(pRExC_state, cl);
734 S_cl_init_zero(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
736 PERL_ARGS_ASSERT_CL_INIT_ZERO;
738 Zero(cl, 1, struct regnode_charclass_class);
740 cl_anything(pRExC_state, cl);
742 cl->flags |= ANYOF_LOCALE;
745 /* 'And' a given class with another one. Can create false positives */
746 /* We assume that cl is not inverted */
748 S_cl_and(struct regnode_charclass_class *cl,
749 const struct regnode_charclass_class *and_with)
751 PERL_ARGS_ASSERT_CL_AND;
753 assert(and_with->type == ANYOF);
754 if (!(and_with->flags & ANYOF_CLASS)
755 && !(cl->flags & ANYOF_CLASS)
756 && (and_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
757 && !(and_with->flags & ANYOF_FOLD)
758 && !(cl->flags & ANYOF_FOLD)) {
761 if (and_with->flags & ANYOF_INVERT)
762 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
763 cl->bitmap[i] &= ~and_with->bitmap[i];
765 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
766 cl->bitmap[i] &= and_with->bitmap[i];
767 } /* XXXX: logic is complicated otherwise, leave it along for a moment. */
768 if (!(and_with->flags & ANYOF_EOS))
769 cl->flags &= ~ANYOF_EOS;
771 if (cl->flags & ANYOF_UNICODE_ALL && and_with->flags & ANYOF_UNICODE &&
772 !(and_with->flags & ANYOF_INVERT)) {
773 cl->flags &= ~ANYOF_UNICODE_ALL;
774 cl->flags |= ANYOF_UNICODE;
775 ARG_SET(cl, ARG(and_with));
777 if (!(and_with->flags & ANYOF_UNICODE_ALL) &&
778 !(and_with->flags & ANYOF_INVERT))
779 cl->flags &= ~ANYOF_UNICODE_ALL;
780 if (!(and_with->flags & (ANYOF_UNICODE|ANYOF_UNICODE_ALL)) &&
781 !(and_with->flags & ANYOF_INVERT))
782 cl->flags &= ~ANYOF_UNICODE;
785 /* 'OR' a given class with another one. Can create false positives */
786 /* We assume that cl is not inverted */
788 S_cl_or(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl, const struct regnode_charclass_class *or_with)
790 PERL_ARGS_ASSERT_CL_OR;
792 if (or_with->flags & ANYOF_INVERT) {
794 * (B1 | CL1) | (!B2 & !CL2) = (B1 | !B2 & !CL2) | (CL1 | (!B2 & !CL2))
795 * <= (B1 | !B2) | (CL1 | !CL2)
796 * which is wasteful if CL2 is small, but we ignore CL2:
797 * (B1 | CL1) | (!B2 & !CL2) <= (B1 | CL1) | !B2 = (B1 | !B2) | CL1
798 * XXXX Can we handle case-fold? Unclear:
799 * (OK1(i) | OK1(i')) | !(OK1(i) | OK1(i')) =
800 * (OK1(i) | OK1(i')) | (!OK1(i) & !OK1(i'))
802 if ( (or_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
803 && !(or_with->flags & ANYOF_FOLD)
804 && !(cl->flags & ANYOF_FOLD) ) {
807 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
808 cl->bitmap[i] |= ~or_with->bitmap[i];
809 } /* XXXX: logic is complicated otherwise */
811 cl_anything(pRExC_state, cl);
814 /* (B1 | CL1) | (B2 | CL2) = (B1 | B2) | (CL1 | CL2)) */
815 if ( (or_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
816 && (!(or_with->flags & ANYOF_FOLD)
817 || (cl->flags & ANYOF_FOLD)) ) {
820 /* OR char bitmap and class bitmap separately */
821 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
822 cl->bitmap[i] |= or_with->bitmap[i];
823 if (or_with->flags & ANYOF_CLASS) {
824 for (i = 0; i < ANYOF_CLASSBITMAP_SIZE; i++)
825 cl->classflags[i] |= or_with->classflags[i];
826 cl->flags |= ANYOF_CLASS;
829 else { /* XXXX: logic is complicated, leave it along for a moment. */
830 cl_anything(pRExC_state, cl);
833 if (or_with->flags & ANYOF_EOS)
834 cl->flags |= ANYOF_EOS;
836 if (cl->flags & ANYOF_UNICODE && or_with->flags & ANYOF_UNICODE &&
837 ARG(cl) != ARG(or_with)) {
838 cl->flags |= ANYOF_UNICODE_ALL;
839 cl->flags &= ~ANYOF_UNICODE;
841 if (or_with->flags & ANYOF_UNICODE_ALL) {
842 cl->flags |= ANYOF_UNICODE_ALL;
843 cl->flags &= ~ANYOF_UNICODE;
847 #define TRIE_LIST_ITEM(state,idx) (trie->states[state].trans.list)[ idx ]
848 #define TRIE_LIST_CUR(state) ( TRIE_LIST_ITEM( state, 0 ).forid )
849 #define TRIE_LIST_LEN(state) ( TRIE_LIST_ITEM( state, 0 ).newstate )
850 #define TRIE_LIST_USED(idx) ( trie->states[state].trans.list ? (TRIE_LIST_CUR( idx ) - 1) : 0 )
855 dump_trie(trie,widecharmap,revcharmap)
856 dump_trie_interim_list(trie,widecharmap,revcharmap,next_alloc)
857 dump_trie_interim_table(trie,widecharmap,revcharmap,next_alloc)
859 These routines dump out a trie in a somewhat readable format.
860 The _interim_ variants are used for debugging the interim
861 tables that are used to generate the final compressed
862 representation which is what dump_trie expects.
864 Part of the reason for their existance is to provide a form
865 of documentation as to how the different representations function.
870 Dumps the final compressed table form of the trie to Perl_debug_log.
871 Used for debugging make_trie().
875 S_dump_trie(pTHX_ const struct _reg_trie_data *trie, HV *widecharmap,
876 AV *revcharmap, U32 depth)
879 SV *sv=sv_newmortal();
880 int colwidth= widecharmap ? 6 : 4;
882 GET_RE_DEBUG_FLAGS_DECL;
884 PERL_ARGS_ASSERT_DUMP_TRIE;
886 PerlIO_printf( Perl_debug_log, "%*sChar : %-6s%-6s%-4s ",
887 (int)depth * 2 + 2,"",
888 "Match","Base","Ofs" );
890 for( state = 0 ; state < trie->uniquecharcount ; state++ ) {
891 SV ** const tmp = av_fetch( revcharmap, state, 0);
893 PerlIO_printf( Perl_debug_log, "%*s",
895 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
896 PL_colors[0], PL_colors[1],
897 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
898 PERL_PV_ESCAPE_FIRSTCHAR
903 PerlIO_printf( Perl_debug_log, "\n%*sState|-----------------------",
904 (int)depth * 2 + 2,"");
906 for( state = 0 ; state < trie->uniquecharcount ; state++ )
907 PerlIO_printf( Perl_debug_log, "%.*s", colwidth, "--------");
908 PerlIO_printf( Perl_debug_log, "\n");
910 for( state = 1 ; state < trie->statecount ; state++ ) {
911 const U32 base = trie->states[ state ].trans.base;
913 PerlIO_printf( Perl_debug_log, "%*s#%4"UVXf"|", (int)depth * 2 + 2,"", (UV)state);
915 if ( trie->states[ state ].wordnum ) {
916 PerlIO_printf( Perl_debug_log, " W%4X", trie->states[ state ].wordnum );
918 PerlIO_printf( Perl_debug_log, "%6s", "" );
921 PerlIO_printf( Perl_debug_log, " @%4"UVXf" ", (UV)base );
926 while( ( base + ofs < trie->uniquecharcount ) ||
927 ( base + ofs - trie->uniquecharcount < trie->lasttrans
928 && trie->trans[ base + ofs - trie->uniquecharcount ].check != state))
931 PerlIO_printf( Perl_debug_log, "+%2"UVXf"[ ", (UV)ofs);
933 for ( ofs = 0 ; ofs < trie->uniquecharcount ; ofs++ ) {
934 if ( ( base + ofs >= trie->uniquecharcount ) &&
935 ( base + ofs - trie->uniquecharcount < trie->lasttrans ) &&
936 trie->trans[ base + ofs - trie->uniquecharcount ].check == state )
938 PerlIO_printf( Perl_debug_log, "%*"UVXf,
940 (UV)trie->trans[ base + ofs - trie->uniquecharcount ].next );
942 PerlIO_printf( Perl_debug_log, "%*s",colwidth," ." );
946 PerlIO_printf( Perl_debug_log, "]");
949 PerlIO_printf( Perl_debug_log, "\n" );
951 PerlIO_printf(Perl_debug_log, "%*sword_info N:(prev,len)=", (int)depth*2, "");
952 for (word=1; word <= trie->wordcount; word++) {
953 PerlIO_printf(Perl_debug_log, " %d:(%d,%d)",
954 (int)word, (int)(trie->wordinfo[word].prev),
955 (int)(trie->wordinfo[word].len));
957 PerlIO_printf(Perl_debug_log, "\n" );
960 Dumps a fully constructed but uncompressed trie in list form.
961 List tries normally only are used for construction when the number of
962 possible chars (trie->uniquecharcount) is very high.
963 Used for debugging make_trie().
966 S_dump_trie_interim_list(pTHX_ const struct _reg_trie_data *trie,
967 HV *widecharmap, AV *revcharmap, U32 next_alloc,
971 SV *sv=sv_newmortal();
972 int colwidth= widecharmap ? 6 : 4;
973 GET_RE_DEBUG_FLAGS_DECL;
975 PERL_ARGS_ASSERT_DUMP_TRIE_INTERIM_LIST;
977 /* print out the table precompression. */
978 PerlIO_printf( Perl_debug_log, "%*sState :Word | Transition Data\n%*s%s",
979 (int)depth * 2 + 2,"", (int)depth * 2 + 2,"",
980 "------:-----+-----------------\n" );
982 for( state=1 ; state < next_alloc ; state ++ ) {
985 PerlIO_printf( Perl_debug_log, "%*s %4"UVXf" :",
986 (int)depth * 2 + 2,"", (UV)state );
987 if ( ! trie->states[ state ].wordnum ) {
988 PerlIO_printf( Perl_debug_log, "%5s| ","");
990 PerlIO_printf( Perl_debug_log, "W%4x| ",
991 trie->states[ state ].wordnum
994 for( charid = 1 ; charid <= TRIE_LIST_USED( state ) ; charid++ ) {
995 SV ** const tmp = av_fetch( revcharmap, TRIE_LIST_ITEM(state,charid).forid, 0);
997 PerlIO_printf( Perl_debug_log, "%*s:%3X=%4"UVXf" | ",
999 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
1000 PL_colors[0], PL_colors[1],
1001 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
1002 PERL_PV_ESCAPE_FIRSTCHAR
1004 TRIE_LIST_ITEM(state,charid).forid,
1005 (UV)TRIE_LIST_ITEM(state,charid).newstate
1008 PerlIO_printf(Perl_debug_log, "\n%*s| ",
1009 (int)((depth * 2) + 14), "");
1012 PerlIO_printf( Perl_debug_log, "\n");
1017 Dumps a fully constructed but uncompressed trie in table form.
1018 This is the normal DFA style state transition table, with a few
1019 twists to facilitate compression later.
1020 Used for debugging make_trie().
1023 S_dump_trie_interim_table(pTHX_ const struct _reg_trie_data *trie,
1024 HV *widecharmap, AV *revcharmap, U32 next_alloc,
1029 SV *sv=sv_newmortal();
1030 int colwidth= widecharmap ? 6 : 4;
1031 GET_RE_DEBUG_FLAGS_DECL;
1033 PERL_ARGS_ASSERT_DUMP_TRIE_INTERIM_TABLE;
1036 print out the table precompression so that we can do a visual check
1037 that they are identical.
1040 PerlIO_printf( Perl_debug_log, "%*sChar : ",(int)depth * 2 + 2,"" );
1042 for( charid = 0 ; charid < trie->uniquecharcount ; charid++ ) {
1043 SV ** const tmp = av_fetch( revcharmap, charid, 0);
1045 PerlIO_printf( Perl_debug_log, "%*s",
1047 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
1048 PL_colors[0], PL_colors[1],
1049 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
1050 PERL_PV_ESCAPE_FIRSTCHAR
1056 PerlIO_printf( Perl_debug_log, "\n%*sState+-",(int)depth * 2 + 2,"" );
1058 for( charid=0 ; charid < trie->uniquecharcount ; charid++ ) {
1059 PerlIO_printf( Perl_debug_log, "%.*s", colwidth,"--------");
1062 PerlIO_printf( Perl_debug_log, "\n" );
1064 for( state=1 ; state < next_alloc ; state += trie->uniquecharcount ) {
1066 PerlIO_printf( Perl_debug_log, "%*s%4"UVXf" : ",
1067 (int)depth * 2 + 2,"",
1068 (UV)TRIE_NODENUM( state ) );
1070 for( charid = 0 ; charid < trie->uniquecharcount ; charid++ ) {
1071 UV v=(UV)SAFE_TRIE_NODENUM( trie->trans[ state + charid ].next );
1073 PerlIO_printf( Perl_debug_log, "%*"UVXf, colwidth, v );
1075 PerlIO_printf( Perl_debug_log, "%*s", colwidth, "." );
1077 if ( ! trie->states[ TRIE_NODENUM( state ) ].wordnum ) {
1078 PerlIO_printf( Perl_debug_log, " (%4"UVXf")\n", (UV)trie->trans[ state ].check );
1080 PerlIO_printf( Perl_debug_log, " (%4"UVXf") W%4X\n", (UV)trie->trans[ state ].check,
1081 trie->states[ TRIE_NODENUM( state ) ].wordnum );
1089 /* make_trie(startbranch,first,last,tail,word_count,flags,depth)
1090 startbranch: the first branch in the whole branch sequence
1091 first : start branch of sequence of branch-exact nodes.
1092 May be the same as startbranch
1093 last : Thing following the last branch.
1094 May be the same as tail.
1095 tail : item following the branch sequence
1096 count : words in the sequence
1097 flags : currently the OP() type we will be building one of /EXACT(|F|Fl)/
1098 depth : indent depth
1100 Inplace optimizes a sequence of 2 or more Branch-Exact nodes into a TRIE node.
1102 A trie is an N'ary tree where the branches are determined by digital
1103 decomposition of the key. IE, at the root node you look up the 1st character and
1104 follow that branch repeat until you find the end of the branches. Nodes can be
1105 marked as "accepting" meaning they represent a complete word. Eg:
1109 would convert into the following structure. Numbers represent states, letters
1110 following numbers represent valid transitions on the letter from that state, if
1111 the number is in square brackets it represents an accepting state, otherwise it
1112 will be in parenthesis.
1114 +-h->+-e->[3]-+-r->(8)-+-s->[9]
1118 (1) +-i->(6)-+-s->[7]
1120 +-s->(3)-+-h->(4)-+-e->[5]
1122 Accept Word Mapping: 3=>1 (he),5=>2 (she), 7=>3 (his), 9=>4 (hers)
1124 This shows that when matching against the string 'hers' we will begin at state 1
1125 read 'h' and move to state 2, read 'e' and move to state 3 which is accepting,
1126 then read 'r' and go to state 8 followed by 's' which takes us to state 9 which
1127 is also accepting. Thus we know that we can match both 'he' and 'hers' with a
1128 single traverse. We store a mapping from accepting to state to which word was
1129 matched, and then when we have multiple possibilities we try to complete the
1130 rest of the regex in the order in which they occured in the alternation.
1132 The only prior NFA like behaviour that would be changed by the TRIE support is
1133 the silent ignoring of duplicate alternations which are of the form:
1135 / (DUPE|DUPE) X? (?{ ... }) Y /x
1137 Thus EVAL blocks follwing a trie may be called a different number of times with
1138 and without the optimisation. With the optimisations dupes will be silently
1139 ignored. This inconsistant behaviour of EVAL type nodes is well established as
1140 the following demonstrates:
1142 'words'=~/(word|word|word)(?{ print $1 })[xyz]/
1144 which prints out 'word' three times, but
1146 'words'=~/(word|word|word)(?{ print $1 })S/
1148 which doesnt print it out at all. This is due to other optimisations kicking in.
1150 Example of what happens on a structural level:
1152 The regexp /(ac|ad|ab)+/ will produce the folowing debug output:
1154 1: CURLYM[1] {1,32767}(18)
1165 This would be optimizable with startbranch=5, first=5, last=16, tail=16
1166 and should turn into:
1168 1: CURLYM[1] {1,32767}(18)
1170 [Words:3 Chars Stored:6 Unique Chars:4 States:5 NCP:1]
1178 Cases where tail != last would be like /(?foo|bar)baz/:
1188 which would be optimizable with startbranch=1, first=1, last=7, tail=8
1189 and would end up looking like:
1192 [Words:2 Chars Stored:6 Unique Chars:5 States:7 NCP:1]
1199 d = uvuni_to_utf8_flags(d, uv, 0);
1201 is the recommended Unicode-aware way of saying
1206 #define TRIE_STORE_REVCHAR \
1209 SV *zlopp = newSV(2); \
1210 unsigned char *flrbbbbb = (unsigned char *) SvPVX(zlopp); \
1211 unsigned const char *const kapow = uvuni_to_utf8(flrbbbbb, uvc & 0xFF); \
1212 SvCUR_set(zlopp, kapow - flrbbbbb); \
1215 av_push(revcharmap, zlopp); \
1217 char ooooff = (char)uvc; \
1218 av_push(revcharmap, newSVpvn(&ooooff, 1)); \
1222 #define TRIE_READ_CHAR STMT_START { \
1226 if ( foldlen > 0 ) { \
1227 uvc = utf8n_to_uvuni( scan, UTF8_MAXLEN, &len, uniflags ); \
1232 uvc = utf8n_to_uvuni( (const U8*)uc, UTF8_MAXLEN, &len, uniflags);\
1233 uvc = to_uni_fold( uvc, foldbuf, &foldlen ); \
1234 foldlen -= UNISKIP( uvc ); \
1235 scan = foldbuf + UNISKIP( uvc ); \
1238 uvc = utf8n_to_uvuni( (const U8*)uc, UTF8_MAXLEN, &len, uniflags);\
1248 #define TRIE_LIST_PUSH(state,fid,ns) STMT_START { \
1249 if ( TRIE_LIST_CUR( state ) >=TRIE_LIST_LEN( state ) ) { \
1250 U32 ging = TRIE_LIST_LEN( state ) *= 2; \
1251 Renew( trie->states[ state ].trans.list, ging, reg_trie_trans_le ); \
1253 TRIE_LIST_ITEM( state, TRIE_LIST_CUR( state ) ).forid = fid; \
1254 TRIE_LIST_ITEM( state, TRIE_LIST_CUR( state ) ).newstate = ns; \
1255 TRIE_LIST_CUR( state )++; \
1258 #define TRIE_LIST_NEW(state) STMT_START { \
1259 Newxz( trie->states[ state ].trans.list, \
1260 4, reg_trie_trans_le ); \
1261 TRIE_LIST_CUR( state ) = 1; \
1262 TRIE_LIST_LEN( state ) = 4; \
1265 #define TRIE_HANDLE_WORD(state) STMT_START { \
1266 U16 dupe= trie->states[ state ].wordnum; \
1267 regnode * const noper_next = regnext( noper ); \
1270 /* store the word for dumping */ \
1272 if (OP(noper) != NOTHING) \
1273 tmp = newSVpvn_utf8(STRING(noper), STR_LEN(noper), UTF); \
1275 tmp = newSVpvn_utf8( "", 0, UTF ); \
1276 av_push( trie_words, tmp ); \
1280 trie->wordinfo[curword].prev = 0; \
1281 trie->wordinfo[curword].len = wordlen; \
1282 trie->wordinfo[curword].accept = state; \
1284 if ( noper_next < tail ) { \
1286 trie->jump = (U16 *) PerlMemShared_calloc( word_count + 1, sizeof(U16) ); \
1287 trie->jump[curword] = (U16)(noper_next - convert); \
1289 jumper = noper_next; \
1291 nextbranch= regnext(cur); \
1295 /* It's a dupe. Pre-insert into the wordinfo[].prev */\
1296 /* chain, so that when the bits of chain are later */\
1297 /* linked together, the dups appear in the chain */\
1298 trie->wordinfo[curword].prev = trie->wordinfo[dupe].prev; \
1299 trie->wordinfo[dupe].prev = curword; \
1301 /* we haven't inserted this word yet. */ \
1302 trie->states[ state ].wordnum = curword; \
1307 #define TRIE_TRANS_STATE(state,base,ucharcount,charid,special) \
1308 ( ( base + charid >= ucharcount \
1309 && base + charid < ubound \
1310 && state == trie->trans[ base - ucharcount + charid ].check \
1311 && trie->trans[ base - ucharcount + charid ].next ) \
1312 ? trie->trans[ base - ucharcount + charid ].next \
1313 : ( state==1 ? special : 0 ) \
1317 #define MADE_JUMP_TRIE 2
1318 #define MADE_EXACT_TRIE 4
1321 S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *first, regnode *last, regnode *tail, U32 word_count, U32 flags, U32 depth)
1324 /* first pass, loop through and scan words */
1325 reg_trie_data *trie;
1326 HV *widecharmap = NULL;
1327 AV *revcharmap = newAV();
1329 const U32 uniflags = UTF8_ALLOW_DEFAULT;
1334 regnode *jumper = NULL;
1335 regnode *nextbranch = NULL;
1336 regnode *convert = NULL;
1337 U32 *prev_states; /* temp array mapping each state to previous one */
1338 /* we just use folder as a flag in utf8 */
1339 const U8 * const folder = ( flags == EXACTF
1341 : ( flags == EXACTFL
1348 const U32 data_slot = add_data( pRExC_state, 4, "tuuu" );
1349 AV *trie_words = NULL;
1350 /* along with revcharmap, this only used during construction but both are
1351 * useful during debugging so we store them in the struct when debugging.
1354 const U32 data_slot = add_data( pRExC_state, 2, "tu" );
1355 STRLEN trie_charcount=0;
1357 SV *re_trie_maxbuff;
1358 GET_RE_DEBUG_FLAGS_DECL;
1360 PERL_ARGS_ASSERT_MAKE_TRIE;
1362 PERL_UNUSED_ARG(depth);
1365 trie = (reg_trie_data *) PerlMemShared_calloc( 1, sizeof(reg_trie_data) );
1367 trie->startstate = 1;
1368 trie->wordcount = word_count;
1369 RExC_rxi->data->data[ data_slot ] = (void*)trie;
1370 trie->charmap = (U16 *) PerlMemShared_calloc( 256, sizeof(U16) );
1371 if (!(UTF && folder))
1372 trie->bitmap = (char *) PerlMemShared_calloc( ANYOF_BITMAP_SIZE, 1 );
1373 trie->wordinfo = (reg_trie_wordinfo *) PerlMemShared_calloc(
1374 trie->wordcount+1, sizeof(reg_trie_wordinfo));
1377 trie_words = newAV();
1380 re_trie_maxbuff = get_sv(RE_TRIE_MAXBUF_NAME, 1);
1381 if (!SvIOK(re_trie_maxbuff)) {
1382 sv_setiv(re_trie_maxbuff, RE_TRIE_MAXBUF_INIT);
1385 PerlIO_printf( Perl_debug_log,
1386 "%*smake_trie start==%d, first==%d, last==%d, tail==%d depth=%d\n",
1387 (int)depth * 2 + 2, "",
1388 REG_NODE_NUM(startbranch),REG_NODE_NUM(first),
1389 REG_NODE_NUM(last), REG_NODE_NUM(tail),
1393 /* Find the node we are going to overwrite */
1394 if ( first == startbranch && OP( last ) != BRANCH ) {
1395 /* whole branch chain */
1398 /* branch sub-chain */
1399 convert = NEXTOPER( first );
1402 /* -- First loop and Setup --
1404 We first traverse the branches and scan each word to determine if it
1405 contains widechars, and how many unique chars there are, this is
1406 important as we have to build a table with at least as many columns as we
1409 We use an array of integers to represent the character codes 0..255
1410 (trie->charmap) and we use a an HV* to store Unicode characters. We use the
1411 native representation of the character value as the key and IV's for the
1414 *TODO* If we keep track of how many times each character is used we can
1415 remap the columns so that the table compression later on is more
1416 efficient in terms of memory by ensuring most common value is in the
1417 middle and the least common are on the outside. IMO this would be better
1418 than a most to least common mapping as theres a decent chance the most
1419 common letter will share a node with the least common, meaning the node
1420 will not be compressable. With a middle is most common approach the worst
1421 case is when we have the least common nodes twice.
1425 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1426 regnode * const noper = NEXTOPER( cur );
1427 const U8 *uc = (U8*)STRING( noper );
1428 const U8 * const e = uc + STR_LEN( noper );
1430 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1431 const U8 *scan = (U8*)NULL;
1432 U32 wordlen = 0; /* required init */
1434 bool set_bit = trie->bitmap ? 1 : 0; /*store the first char in the bitmap?*/
1436 if (OP(noper) == NOTHING) {
1440 if ( set_bit ) /* bitmap only alloced when !(UTF&&Folding) */
1441 TRIE_BITMAP_SET(trie,*uc); /* store the raw first byte
1442 regardless of encoding */
1444 for ( ; uc < e ; uc += len ) {
1445 TRIE_CHARCOUNT(trie)++;
1449 if ( !trie->charmap[ uvc ] ) {
1450 trie->charmap[ uvc ]=( ++trie->uniquecharcount );
1452 trie->charmap[ folder[ uvc ] ] = trie->charmap[ uvc ];
1456 /* store the codepoint in the bitmap, and if its ascii
1457 also store its folded equivelent. */
1458 TRIE_BITMAP_SET(trie,uvc);
1460 /* store the folded codepoint */
1461 if ( folder ) TRIE_BITMAP_SET(trie,folder[ uvc ]);
1464 /* store first byte of utf8 representation of
1465 codepoints in the 127 < uvc < 256 range */
1466 if (127 < uvc && uvc < 192) {
1467 TRIE_BITMAP_SET(trie,194);
1468 } else if (191 < uvc ) {
1469 TRIE_BITMAP_SET(trie,195);
1470 /* && uvc < 256 -- we know uvc is < 256 already */
1473 set_bit = 0; /* We've done our bit :-) */
1478 widecharmap = newHV();
1480 svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 1 );
1483 Perl_croak( aTHX_ "error creating/fetching widecharmap entry for 0x%"UVXf, uvc );
1485 if ( !SvTRUE( *svpp ) ) {
1486 sv_setiv( *svpp, ++trie->uniquecharcount );
1491 if( cur == first ) {
1494 } else if (chars < trie->minlen) {
1496 } else if (chars > trie->maxlen) {
1500 } /* end first pass */
1501 DEBUG_TRIE_COMPILE_r(
1502 PerlIO_printf( Perl_debug_log, "%*sTRIE(%s): W:%d C:%d Uq:%d Min:%d Max:%d\n",
1503 (int)depth * 2 + 2,"",
1504 ( widecharmap ? "UTF8" : "NATIVE" ), (int)word_count,
1505 (int)TRIE_CHARCOUNT(trie), trie->uniquecharcount,
1506 (int)trie->minlen, (int)trie->maxlen )
1510 We now know what we are dealing with in terms of unique chars and
1511 string sizes so we can calculate how much memory a naive
1512 representation using a flat table will take. If it's over a reasonable
1513 limit (as specified by ${^RE_TRIE_MAXBUF}) we use a more memory
1514 conservative but potentially much slower representation using an array
1517 At the end we convert both representations into the same compressed
1518 form that will be used in regexec.c for matching with. The latter
1519 is a form that cannot be used to construct with but has memory
1520 properties similar to the list form and access properties similar
1521 to the table form making it both suitable for fast searches and
1522 small enough that its feasable to store for the duration of a program.
1524 See the comment in the code where the compressed table is produced
1525 inplace from the flat tabe representation for an explanation of how
1526 the compression works.
1531 Newx(prev_states, TRIE_CHARCOUNT(trie) + 2, U32);
1534 if ( (IV)( ( TRIE_CHARCOUNT(trie) + 1 ) * trie->uniquecharcount + 1) > SvIV(re_trie_maxbuff) ) {
1536 Second Pass -- Array Of Lists Representation
1538 Each state will be represented by a list of charid:state records
1539 (reg_trie_trans_le) the first such element holds the CUR and LEN
1540 points of the allocated array. (See defines above).
1542 We build the initial structure using the lists, and then convert
1543 it into the compressed table form which allows faster lookups
1544 (but cant be modified once converted).
1547 STRLEN transcount = 1;
1549 DEBUG_TRIE_COMPILE_MORE_r( PerlIO_printf( Perl_debug_log,
1550 "%*sCompiling trie using list compiler\n",
1551 (int)depth * 2 + 2, ""));
1553 trie->states = (reg_trie_state *)
1554 PerlMemShared_calloc( TRIE_CHARCOUNT(trie) + 2,
1555 sizeof(reg_trie_state) );
1559 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1561 regnode * const noper = NEXTOPER( cur );
1562 U8 *uc = (U8*)STRING( noper );
1563 const U8 * const e = uc + STR_LEN( noper );
1564 U32 state = 1; /* required init */
1565 U16 charid = 0; /* sanity init */
1566 U8 *scan = (U8*)NULL; /* sanity init */
1567 STRLEN foldlen = 0; /* required init */
1568 U32 wordlen = 0; /* required init */
1569 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1571 if (OP(noper) != NOTHING) {
1572 for ( ; uc < e ; uc += len ) {
1577 charid = trie->charmap[ uvc ];
1579 SV** const svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 0);
1583 charid=(U16)SvIV( *svpp );
1586 /* charid is now 0 if we dont know the char read, or nonzero if we do */
1593 if ( !trie->states[ state ].trans.list ) {
1594 TRIE_LIST_NEW( state );
1596 for ( check = 1; check <= TRIE_LIST_USED( state ); check++ ) {
1597 if ( TRIE_LIST_ITEM( state, check ).forid == charid ) {
1598 newstate = TRIE_LIST_ITEM( state, check ).newstate;
1603 newstate = next_alloc++;
1604 prev_states[newstate] = state;
1605 TRIE_LIST_PUSH( state, charid, newstate );
1610 Perl_croak( aTHX_ "panic! In trie construction, no char mapping for %"IVdf, uvc );
1614 TRIE_HANDLE_WORD(state);
1616 } /* end second pass */
1618 /* next alloc is the NEXT state to be allocated */
1619 trie->statecount = next_alloc;
1620 trie->states = (reg_trie_state *)
1621 PerlMemShared_realloc( trie->states,
1623 * sizeof(reg_trie_state) );
1625 /* and now dump it out before we compress it */
1626 DEBUG_TRIE_COMPILE_MORE_r(dump_trie_interim_list(trie, widecharmap,
1627 revcharmap, next_alloc,
1631 trie->trans = (reg_trie_trans *)
1632 PerlMemShared_calloc( transcount, sizeof(reg_trie_trans) );
1639 for( state=1 ; state < next_alloc ; state ++ ) {
1643 DEBUG_TRIE_COMPILE_MORE_r(
1644 PerlIO_printf( Perl_debug_log, "tp: %d zp: %d ",tp,zp)
1648 if (trie->states[state].trans.list) {
1649 U16 minid=TRIE_LIST_ITEM( state, 1).forid;
1653 for( idx = 2 ; idx <= TRIE_LIST_USED( state ) ; idx++ ) {
1654 const U16 forid = TRIE_LIST_ITEM( state, idx).forid;
1655 if ( forid < minid ) {
1657 } else if ( forid > maxid ) {
1661 if ( transcount < tp + maxid - minid + 1) {
1663 trie->trans = (reg_trie_trans *)
1664 PerlMemShared_realloc( trie->trans,
1666 * sizeof(reg_trie_trans) );
1667 Zero( trie->trans + (transcount / 2), transcount / 2 , reg_trie_trans );
1669 base = trie->uniquecharcount + tp - minid;
1670 if ( maxid == minid ) {
1672 for ( ; zp < tp ; zp++ ) {
1673 if ( ! trie->trans[ zp ].next ) {
1674 base = trie->uniquecharcount + zp - minid;
1675 trie->trans[ zp ].next = TRIE_LIST_ITEM( state, 1).newstate;
1676 trie->trans[ zp ].check = state;
1682 trie->trans[ tp ].next = TRIE_LIST_ITEM( state, 1).newstate;
1683 trie->trans[ tp ].check = state;
1688 for ( idx=1; idx <= TRIE_LIST_USED( state ) ; idx++ ) {
1689 const U32 tid = base - trie->uniquecharcount + TRIE_LIST_ITEM( state, idx ).forid;
1690 trie->trans[ tid ].next = TRIE_LIST_ITEM( state, idx ).newstate;
1691 trie->trans[ tid ].check = state;
1693 tp += ( maxid - minid + 1 );
1695 Safefree(trie->states[ state ].trans.list);
1698 DEBUG_TRIE_COMPILE_MORE_r(
1699 PerlIO_printf( Perl_debug_log, " base: %d\n",base);
1702 trie->states[ state ].trans.base=base;
1704 trie->lasttrans = tp + 1;
1708 Second Pass -- Flat Table Representation.
1710 we dont use the 0 slot of either trans[] or states[] so we add 1 to each.
1711 We know that we will need Charcount+1 trans at most to store the data
1712 (one row per char at worst case) So we preallocate both structures
1713 assuming worst case.
1715 We then construct the trie using only the .next slots of the entry
1718 We use the .check field of the first entry of the node temporarily to
1719 make compression both faster and easier by keeping track of how many non
1720 zero fields are in the node.
1722 Since trans are numbered from 1 any 0 pointer in the table is a FAIL
1725 There are two terms at use here: state as a TRIE_NODEIDX() which is a
1726 number representing the first entry of the node, and state as a
1727 TRIE_NODENUM() which is the trans number. state 1 is TRIE_NODEIDX(1) and
1728 TRIE_NODENUM(1), state 2 is TRIE_NODEIDX(2) and TRIE_NODENUM(3) if there
1729 are 2 entrys per node. eg:
1737 The table is internally in the right hand, idx form. However as we also
1738 have to deal with the states array which is indexed by nodenum we have to
1739 use TRIE_NODENUM() to convert.
1742 DEBUG_TRIE_COMPILE_MORE_r( PerlIO_printf( Perl_debug_log,
1743 "%*sCompiling trie using table compiler\n",
1744 (int)depth * 2 + 2, ""));
1746 trie->trans = (reg_trie_trans *)
1747 PerlMemShared_calloc( ( TRIE_CHARCOUNT(trie) + 1 )
1748 * trie->uniquecharcount + 1,
1749 sizeof(reg_trie_trans) );
1750 trie->states = (reg_trie_state *)
1751 PerlMemShared_calloc( TRIE_CHARCOUNT(trie) + 2,
1752 sizeof(reg_trie_state) );
1753 next_alloc = trie->uniquecharcount + 1;
1756 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1758 regnode * const noper = NEXTOPER( cur );
1759 const U8 *uc = (U8*)STRING( noper );
1760 const U8 * const e = uc + STR_LEN( noper );
1762 U32 state = 1; /* required init */
1764 U16 charid = 0; /* sanity init */
1765 U32 accept_state = 0; /* sanity init */
1766 U8 *scan = (U8*)NULL; /* sanity init */
1768 STRLEN foldlen = 0; /* required init */
1769 U32 wordlen = 0; /* required init */
1770 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1772 if ( OP(noper) != NOTHING ) {
1773 for ( ; uc < e ; uc += len ) {
1778 charid = trie->charmap[ uvc ];
1780 SV* const * const svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 0);
1781 charid = svpp ? (U16)SvIV(*svpp) : 0;
1785 if ( !trie->trans[ state + charid ].next ) {
1786 trie->trans[ state + charid ].next = next_alloc;
1787 trie->trans[ state ].check++;
1788 prev_states[TRIE_NODENUM(next_alloc)]
1789 = TRIE_NODENUM(state);
1790 next_alloc += trie->uniquecharcount;
1792 state = trie->trans[ state + charid ].next;
1794 Perl_croak( aTHX_ "panic! In trie construction, no char mapping for %"IVdf, uvc );
1796 /* charid is now 0 if we dont know the char read, or nonzero if we do */
1799 accept_state = TRIE_NODENUM( state );
1800 TRIE_HANDLE_WORD(accept_state);
1802 } /* end second pass */
1804 /* and now dump it out before we compress it */
1805 DEBUG_TRIE_COMPILE_MORE_r(dump_trie_interim_table(trie, widecharmap,
1807 next_alloc, depth+1));
1811 * Inplace compress the table.*
1813 For sparse data sets the table constructed by the trie algorithm will
1814 be mostly 0/FAIL transitions or to put it another way mostly empty.
1815 (Note that leaf nodes will not contain any transitions.)
1817 This algorithm compresses the tables by eliminating most such
1818 transitions, at the cost of a modest bit of extra work during lookup:
1820 - Each states[] entry contains a .base field which indicates the
1821 index in the state[] array wheres its transition data is stored.
1823 - If .base is 0 there are no valid transitions from that node.
1825 - If .base is nonzero then charid is added to it to find an entry in
1828 -If trans[states[state].base+charid].check!=state then the
1829 transition is taken to be a 0/Fail transition. Thus if there are fail
1830 transitions at the front of the node then the .base offset will point
1831 somewhere inside the previous nodes data (or maybe even into a node
1832 even earlier), but the .check field determines if the transition is
1836 The following process inplace converts the table to the compressed
1837 table: We first do not compress the root node 1,and mark its all its
1838 .check pointers as 1 and set its .base pointer as 1 as well. This
1839 allows to do a DFA construction from the compressed table later, and
1840 ensures that any .base pointers we calculate later are greater than
1843 - We set 'pos' to indicate the first entry of the second node.
1845 - We then iterate over the columns of the node, finding the first and
1846 last used entry at l and m. We then copy l..m into pos..(pos+m-l),
1847 and set the .check pointers accordingly, and advance pos
1848 appropriately and repreat for the next node. Note that when we copy
1849 the next pointers we have to convert them from the original
1850 NODEIDX form to NODENUM form as the former is not valid post
1853 - If a node has no transitions used we mark its base as 0 and do not
1854 advance the pos pointer.
1856 - If a node only has one transition we use a second pointer into the
1857 structure to fill in allocated fail transitions from other states.
1858 This pointer is independent of the main pointer and scans forward
1859 looking for null transitions that are allocated to a state. When it
1860 finds one it writes the single transition into the "hole". If the
1861 pointer doesnt find one the single transition is appended as normal.
1863 - Once compressed we can Renew/realloc the structures to release the
1866 See "Table-Compression Methods" in sec 3.9 of the Red Dragon,
1867 specifically Fig 3.47 and the associated pseudocode.
1871 const U32 laststate = TRIE_NODENUM( next_alloc );
1874 trie->statecount = laststate;
1876 for ( state = 1 ; state < laststate ; state++ ) {
1878 const U32 stateidx = TRIE_NODEIDX( state );
1879 const U32 o_used = trie->trans[ stateidx ].check;
1880 U32 used = trie->trans[ stateidx ].check;
1881 trie->trans[ stateidx ].check = 0;
1883 for ( charid = 0 ; used && charid < trie->uniquecharcount ; charid++ ) {
1884 if ( flag || trie->trans[ stateidx + charid ].next ) {
1885 if ( trie->trans[ stateidx + charid ].next ) {
1887 for ( ; zp < pos ; zp++ ) {
1888 if ( ! trie->trans[ zp ].next ) {
1892 trie->states[ state ].trans.base = zp + trie->uniquecharcount - charid ;
1893 trie->trans[ zp ].next = SAFE_TRIE_NODENUM( trie->trans[ stateidx + charid ].next );
1894 trie->trans[ zp ].check = state;
1895 if ( ++zp > pos ) pos = zp;
1902 trie->states[ state ].trans.base = pos + trie->uniquecharcount - charid ;
1904 trie->trans[ pos ].next = SAFE_TRIE_NODENUM( trie->trans[ stateidx + charid ].next );
1905 trie->trans[ pos ].check = state;
1910 trie->lasttrans = pos + 1;
1911 trie->states = (reg_trie_state *)
1912 PerlMemShared_realloc( trie->states, laststate
1913 * sizeof(reg_trie_state) );
1914 DEBUG_TRIE_COMPILE_MORE_r(
1915 PerlIO_printf( Perl_debug_log,
1916 "%*sAlloc: %d Orig: %"IVdf" elements, Final:%"IVdf". Savings of %%%5.2f\n",
1917 (int)depth * 2 + 2,"",
1918 (int)( ( TRIE_CHARCOUNT(trie) + 1 ) * trie->uniquecharcount + 1 ),
1921 ( ( next_alloc - pos ) * 100 ) / (double)next_alloc );
1924 } /* end table compress */
1926 DEBUG_TRIE_COMPILE_MORE_r(
1927 PerlIO_printf(Perl_debug_log, "%*sStatecount:%"UVxf" Lasttrans:%"UVxf"\n",
1928 (int)depth * 2 + 2, "",
1929 (UV)trie->statecount,
1930 (UV)trie->lasttrans)
1932 /* resize the trans array to remove unused space */
1933 trie->trans = (reg_trie_trans *)
1934 PerlMemShared_realloc( trie->trans, trie->lasttrans
1935 * sizeof(reg_trie_trans) );
1937 { /* Modify the program and insert the new TRIE node*/
1938 U8 nodetype =(U8)(flags & 0xFF);
1942 regnode *optimize = NULL;
1943 #ifdef RE_TRACK_PATTERN_OFFSETS
1946 U32 mjd_nodelen = 0;
1947 #endif /* RE_TRACK_PATTERN_OFFSETS */
1948 #endif /* DEBUGGING */
1950 This means we convert either the first branch or the first Exact,
1951 depending on whether the thing following (in 'last') is a branch
1952 or not and whther first is the startbranch (ie is it a sub part of
1953 the alternation or is it the whole thing.)
1954 Assuming its a sub part we conver the EXACT otherwise we convert
1955 the whole branch sequence, including the first.
1957 /* Find the node we are going to overwrite */
1958 if ( first != startbranch || OP( last ) == BRANCH ) {
1959 /* branch sub-chain */
1960 NEXT_OFF( first ) = (U16)(last - first);
1961 #ifdef RE_TRACK_PATTERN_OFFSETS
1963 mjd_offset= Node_Offset((convert));
1964 mjd_nodelen= Node_Length((convert));
1967 /* whole branch chain */
1969 #ifdef RE_TRACK_PATTERN_OFFSETS
1972 const regnode *nop = NEXTOPER( convert );
1973 mjd_offset= Node_Offset((nop));
1974 mjd_nodelen= Node_Length((nop));
1978 PerlIO_printf(Perl_debug_log, "%*sMJD offset:%"UVuf" MJD length:%"UVuf"\n",
1979 (int)depth * 2 + 2, "",
1980 (UV)mjd_offset, (UV)mjd_nodelen)
1983 /* But first we check to see if there is a common prefix we can
1984 split out as an EXACT and put in front of the TRIE node. */
1985 trie->startstate= 1;
1986 if ( trie->bitmap && !widecharmap && !trie->jump ) {
1988 for ( state = 1 ; state < trie->statecount-1 ; state++ ) {
1992 const U32 base = trie->states[ state ].trans.base;
1994 if ( trie->states[state].wordnum )
1997 for ( ofs = 0 ; ofs < trie->uniquecharcount ; ofs++ ) {
1998 if ( ( base + ofs >= trie->uniquecharcount ) &&
1999 ( base + ofs - trie->uniquecharcount < trie->lasttrans ) &&
2000 trie->trans[ base + ofs - trie->uniquecharcount ].check == state )
2002 if ( ++count > 1 ) {
2003 SV **tmp = av_fetch( revcharmap, ofs, 0);
2004 const U8 *ch = (U8*)SvPV_nolen_const( *tmp );
2005 if ( state == 1 ) break;
2007 Zero(trie->bitmap, ANYOF_BITMAP_SIZE, char);
2009 PerlIO_printf(Perl_debug_log,
2010 "%*sNew Start State=%"UVuf" Class: [",
2011 (int)depth * 2 + 2, "",
2014 SV ** const tmp = av_fetch( revcharmap, idx, 0);
2015 const U8 * const ch = (U8*)SvPV_nolen_const( *tmp );
2017 TRIE_BITMAP_SET(trie,*ch);
2019 TRIE_BITMAP_SET(trie, folder[ *ch ]);
2021 PerlIO_printf(Perl_debug_log, "%s", (char*)ch)
2025 TRIE_BITMAP_SET(trie,*ch);
2027 TRIE_BITMAP_SET(trie,folder[ *ch ]);
2028 DEBUG_OPTIMISE_r(PerlIO_printf( Perl_debug_log,"%s", ch));
2034 SV **tmp = av_fetch( revcharmap, idx, 0);
2036 char *ch = SvPV( *tmp, len );
2038 SV *sv=sv_newmortal();
2039 PerlIO_printf( Perl_debug_log,
2040 "%*sPrefix State: %"UVuf" Idx:%"UVuf" Char='%s'\n",
2041 (int)depth * 2 + 2, "",
2043 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), 6,
2044 PL_colors[0], PL_colors[1],
2045 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
2046 PERL_PV_ESCAPE_FIRSTCHAR
2051 OP( convert ) = nodetype;
2052 str=STRING(convert);
2055 STR_LEN(convert) += len;
2061 DEBUG_OPTIMISE_r(PerlIO_printf( Perl_debug_log,"]\n"));
2066 trie->prefixlen = (state-1);
2068 regnode *n = convert+NODE_SZ_STR(convert);
2069 NEXT_OFF(convert) = NODE_SZ_STR(convert);
2070 trie->startstate = state;
2071 trie->minlen -= (state - 1);
2072 trie->maxlen -= (state - 1);
2074 /* At least the UNICOS C compiler choked on this
2075 * being argument to DEBUG_r(), so let's just have
2078 #ifdef PERL_EXT_RE_BUILD
2084 regnode *fix = convert;
2085 U32 word = trie->wordcount;
2087 Set_Node_Offset_Length(convert, mjd_offset, state - 1);
2088 while( ++fix < n ) {
2089 Set_Node_Offset_Length(fix, 0, 0);
2092 SV ** const tmp = av_fetch( trie_words, word, 0 );
2094 if ( STR_LEN(convert) <= SvCUR(*tmp) )
2095 sv_chop(*tmp, SvPV_nolen(*tmp) + STR_LEN(convert));
2097 sv_chop(*tmp, SvPV_nolen(*tmp) + SvCUR(*tmp));
2105 NEXT_OFF(convert) = (U16)(tail - convert);
2106 DEBUG_r(optimize= n);
2112 if ( trie->maxlen ) {
2113 NEXT_OFF( convert ) = (U16)(tail - convert);
2114 ARG_SET( convert, data_slot );
2115 /* Store the offset to the first unabsorbed branch in
2116 jump[0], which is otherwise unused by the jump logic.
2117 We use this when dumping a trie and during optimisation. */
2119 trie->jump[0] = (U16)(nextbranch - convert);
2122 if ( !trie->states[trie->startstate].wordnum && trie->bitmap &&
2123 ( (char *)jumper - (char *)convert) >= (int)sizeof(struct regnode_charclass) )
2125 OP( convert ) = TRIEC;
2126 Copy(trie->bitmap, ((struct regnode_charclass *)convert)->bitmap, ANYOF_BITMAP_SIZE, char);
2127 PerlMemShared_free(trie->bitmap);
2130 OP( convert ) = TRIE;
2132 /* store the type in the flags */
2133 convert->flags = nodetype;
2137 + regarglen[ OP( convert ) ];
2139 /* XXX We really should free up the resource in trie now,
2140 as we won't use them - (which resources?) dmq */
2142 /* needed for dumping*/
2143 DEBUG_r(if (optimize) {
2144 regnode *opt = convert;
2146 while ( ++opt < optimize) {
2147 Set_Node_Offset_Length(opt,0,0);
2150 Try to clean up some of the debris left after the
2153 while( optimize < jumper ) {
2154 mjd_nodelen += Node_Length((optimize));
2155 OP( optimize ) = OPTIMIZED;
2156 Set_Node_Offset_Length(optimize,0,0);
2159 Set_Node_Offset_Length(convert,mjd_offset,mjd_nodelen);
2161 } /* end node insert */
2162 REH_CALL_COMP_NODE_HOOK(pRExC_state->rx, convert);
2164 /* Finish populating the prev field of the wordinfo array. Walk back
2165 * from each accept state until we find another accept state, and if
2166 * so, point the first word's .prev field at the second word. If the
2167 * second already has a .prev field set, stop now. This will be the
2168 * case either if we've already processed that word's accept state,
2169 * or that that state had multiple words, and the overspill words
2170 * were already linked up earlier.
2177 for (word=1; word <= trie->wordcount; word++) {
2179 if (trie->wordinfo[word].prev)
2181 state = trie->wordinfo[word].accept;
2183 state = prev_states[state];
2186 prev = trie->states[state].wordnum;
2190 trie->wordinfo[word].prev = prev;
2192 Safefree(prev_states);
2196 /* and now dump out the compressed format */
2197 DEBUG_TRIE_COMPILE_r(dump_trie(trie, widecharmap, revcharmap, depth+1));
2199 RExC_rxi->data->data[ data_slot + 1 ] = (void*)widecharmap;
2201 RExC_rxi->data->data[ data_slot + TRIE_WORDS_OFFSET ] = (void*)trie_words;
2202 RExC_rxi->data->data[ data_slot + 3 ] = (void*)revcharmap;
2204 SvREFCNT_dec(revcharmap);
2208 : trie->startstate>1
2214 S_make_trie_failtable(pTHX_ RExC_state_t *pRExC_state, regnode *source, regnode *stclass, U32 depth)
2216 /* The Trie is constructed and compressed now so we can build a fail array now if its needed
2218 This is basically the Aho-Corasick algorithm. Its from exercise 3.31 and 3.32 in the
2219 "Red Dragon" -- Compilers, principles, techniques, and tools. Aho, Sethi, Ullman 1985/88
2222 We find the fail state for each state in the trie, this state is the longest proper
2223 suffix of the current states 'word' that is also a proper prefix of another word in our
2224 trie. State 1 represents the word '' and is the thus the default fail state. This allows
2225 the DFA not to have to restart after its tried and failed a word at a given point, it
2226 simply continues as though it had been matching the other word in the first place.
2228 'abcdgu'=~/abcdefg|cdgu/
2229 When we get to 'd' we are still matching the first word, we would encounter 'g' which would
2230 fail, which would bring use to the state representing 'd' in the second word where we would
2231 try 'g' and succeed, prodceding to match 'cdgu'.
2233 /* add a fail transition */
2234 const U32 trie_offset = ARG(source);
2235 reg_trie_data *trie=(reg_trie_data *)RExC_rxi->data->data[trie_offset];
2237 const U32 ucharcount = trie->uniquecharcount;
2238 const U32 numstates = trie->statecount;
2239 const U32 ubound = trie->lasttrans + ucharcount;
2243 U32 base = trie->states[ 1 ].trans.base;
2246 const U32 data_slot = add_data( pRExC_state, 1, "T" );
2247 GET_RE_DEBUG_FLAGS_DECL;
2249 PERL_ARGS_ASSERT_MAKE_TRIE_FAILTABLE;
2251 PERL_UNUSED_ARG(depth);
2255 ARG_SET( stclass, data_slot );
2256 aho = (reg_ac_data *) PerlMemShared_calloc( 1, sizeof(reg_ac_data) );
2257 RExC_rxi->data->data[ data_slot ] = (void*)aho;
2258 aho->trie=trie_offset;
2259 aho->states=(reg_trie_state *)PerlMemShared_malloc( numstates * sizeof(reg_trie_state) );
2260 Copy( trie->states, aho->states, numstates, reg_trie_state );
2261 Newxz( q, numstates, U32);
2262 aho->fail = (U32 *) PerlMemShared_calloc( numstates, sizeof(U32) );
2265 /* initialize fail[0..1] to be 1 so that we always have
2266 a valid final fail state */
2267 fail[ 0 ] = fail[ 1 ] = 1;
2269 for ( charid = 0; charid < ucharcount ; charid++ ) {
2270 const U32 newstate = TRIE_TRANS_STATE( 1, base, ucharcount, charid, 0 );
2272 q[ q_write ] = newstate;
2273 /* set to point at the root */
2274 fail[ q[ q_write++ ] ]=1;
2277 while ( q_read < q_write) {
2278 const U32 cur = q[ q_read++ % numstates ];
2279 base = trie->states[ cur ].trans.base;
2281 for ( charid = 0 ; charid < ucharcount ; charid++ ) {
2282 const U32 ch_state = TRIE_TRANS_STATE( cur, base, ucharcount, charid, 1 );
2284 U32 fail_state = cur;
2287 fail_state = fail[ fail_state ];
2288 fail_base = aho->states[ fail_state ].trans.base;
2289 } while ( !TRIE_TRANS_STATE( fail_state, fail_base, ucharcount, charid, 1 ) );
2291 fail_state = TRIE_TRANS_STATE( fail_state, fail_base, ucharcount, charid, 1 );
2292 fail[ ch_state ] = fail_state;
2293 if ( !aho->states[ ch_state ].wordnum && aho->states[ fail_state ].wordnum )
2295 aho->states[ ch_state ].wordnum = aho->states[ fail_state ].wordnum;
2297 q[ q_write++ % numstates] = ch_state;
2301 /* restore fail[0..1] to 0 so that we "fall out" of the AC loop
2302 when we fail in state 1, this allows us to use the
2303 charclass scan to find a valid start char. This is based on the principle
2304 that theres a good chance the string being searched contains lots of stuff
2305 that cant be a start char.
2307 fail[ 0 ] = fail[ 1 ] = 0;
2308 DEBUG_TRIE_COMPILE_r({
2309 PerlIO_printf(Perl_debug_log,
2310 "%*sStclass Failtable (%"UVuf" states): 0",
2311 (int)(depth * 2), "", (UV)numstates
2313 for( q_read=1; q_read<numstates; q_read++ ) {
2314 PerlIO_printf(Perl_debug_log, ", %"UVuf, (UV)fail[q_read]);
2316 PerlIO_printf(Perl_debug_log, "\n");
2319 /*RExC_seen |= REG_SEEN_TRIEDFA;*/
2324 * There are strange code-generation bugs caused on sparc64 by gcc-2.95.2.
2325 * These need to be revisited when a newer toolchain becomes available.
2327 #if defined(__sparc64__) && defined(__GNUC__)
2328 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
2329 # undef SPARC64_GCC_WORKAROUND
2330 # define SPARC64_GCC_WORKAROUND 1
2334 #define DEBUG_PEEP(str,scan,depth) \
2335 DEBUG_OPTIMISE_r({if (scan){ \
2336 SV * const mysv=sv_newmortal(); \
2337 regnode *Next = regnext(scan); \
2338 regprop(RExC_rx, mysv, scan); \
2339 PerlIO_printf(Perl_debug_log, "%*s" str ">%3d: %s (%d)\n", \
2340 (int)depth*2, "", REG_NODE_NUM(scan), SvPV_nolen_const(mysv),\
2341 Next ? (REG_NODE_NUM(Next)) : 0 ); \
2348 #define JOIN_EXACT(scan,min,flags) \
2349 if (PL_regkind[OP(scan)] == EXACT) \
2350 join_exact(pRExC_state,(scan),(min),(flags),NULL,depth+1)
2353 S_join_exact(pTHX_ RExC_state_t *pRExC_state, regnode *scan, I32 *min, U32 flags,regnode *val, U32 depth) {
2354 /* Merge several consecutive EXACTish nodes into one. */
2355 regnode *n = regnext(scan);
2357 regnode *next = scan + NODE_SZ_STR(scan);
2361 regnode *stop = scan;
2362 GET_RE_DEBUG_FLAGS_DECL;
2364 PERL_UNUSED_ARG(depth);
2367 PERL_ARGS_ASSERT_JOIN_EXACT;
2368 #ifndef EXPERIMENTAL_INPLACESCAN
2369 PERL_UNUSED_ARG(flags);
2370 PERL_UNUSED_ARG(val);
2372 DEBUG_PEEP("join",scan,depth);
2374 /* Skip NOTHING, merge EXACT*. */
2376 ( PL_regkind[OP(n)] == NOTHING ||
2377 (stringok && (OP(n) == OP(scan))))
2379 && NEXT_OFF(scan) + NEXT_OFF(n) < I16_MAX) {
2381 if (OP(n) == TAIL || n > next)
2383 if (PL_regkind[OP(n)] == NOTHING) {
2384 DEBUG_PEEP("skip:",n,depth);
2385 NEXT_OFF(scan) += NEXT_OFF(n);
2386 next = n + NODE_STEP_REGNODE;
2393 else if (stringok) {
2394 const unsigned int oldl = STR_LEN(scan);
2395 regnode * const nnext = regnext(n);
2397 DEBUG_PEEP("merg",n,depth);
2400 if (oldl + STR_LEN(n) > U8_MAX)
2402 NEXT_OFF(scan) += NEXT_OFF(n);
2403 STR_LEN(scan) += STR_LEN(n);
2404 next = n + NODE_SZ_STR(n);
2405 /* Now we can overwrite *n : */
2406 Move(STRING(n), STRING(scan) + oldl, STR_LEN(n), char);
2414 #ifdef EXPERIMENTAL_INPLACESCAN
2415 if (flags && !NEXT_OFF(n)) {
2416 DEBUG_PEEP("atch", val, depth);
2417 if (reg_off_by_arg[OP(n)]) {
2418 ARG_SET(n, val - n);
2421 NEXT_OFF(n) = val - n;
2428 if (UTF && ( OP(scan) == EXACTF ) && ( STR_LEN(scan) >= 6 ) ) {
2430 Two problematic code points in Unicode casefolding of EXACT nodes:
2432 U+0390 - GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS
2433 U+03B0 - GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS
2439 U+03B9 U+0308 U+0301 0xCE 0xB9 0xCC 0x88 0xCC 0x81
2440 U+03C5 U+0308 U+0301 0xCF 0x85 0xCC 0x88 0xCC 0x81
2442 This means that in case-insensitive matching (or "loose matching",
2443 as Unicode calls it), an EXACTF of length six (the UTF-8 encoded byte
2444 length of the above casefolded versions) can match a target string
2445 of length two (the byte length of UTF-8 encoded U+0390 or U+03B0).
2446 This would rather mess up the minimum length computation.
2448 What we'll do is to look for the tail four bytes, and then peek
2449 at the preceding two bytes to see whether we need to decrease
2450 the minimum length by four (six minus two).
2452 Thanks to the design of UTF-8, there cannot be false matches:
2453 A sequence of valid UTF-8 bytes cannot be a subsequence of
2454 another valid sequence of UTF-8 bytes.
2457 char * const s0 = STRING(scan), *s, *t;
2458 char * const s1 = s0 + STR_LEN(scan) - 1;
2459 char * const s2 = s1 - 4;
2460 #ifdef EBCDIC /* RD tunifold greek 0390 and 03B0 */
2461 const char t0[] = "\xaf\x49\xaf\x42";
2463 const char t0[] = "\xcc\x88\xcc\x81";
2465 const char * const t1 = t0 + 3;
2468 s < s2 && (t = ninstr(s, s1, t0, t1));
2471 if (((U8)t[-1] == 0x68 && (U8)t[-2] == 0xB4) ||
2472 ((U8)t[-1] == 0x46 && (U8)t[-2] == 0xB5))
2474 if (((U8)t[-1] == 0xB9 && (U8)t[-2] == 0xCE) ||
2475 ((U8)t[-1] == 0x85 && (U8)t[-2] == 0xCF))
2483 n = scan + NODE_SZ_STR(scan);
2485 if (PL_regkind[OP(n)] != NOTHING || OP(n) == NOTHING) {
2492 DEBUG_OPTIMISE_r(if (merged){DEBUG_PEEP("finl",scan,depth)});
2496 /* REx optimizer. Converts nodes into quickier variants "in place".
2497 Finds fixed substrings. */
2499 /* Stops at toplevel WHILEM as well as at "last". At end *scanp is set
2500 to the position after last scanned or to NULL. */
2502 #define INIT_AND_WITHP \
2503 assert(!and_withp); \
2504 Newx(and_withp,1,struct regnode_charclass_class); \
2505 SAVEFREEPV(and_withp)
2507 /* this is a chain of data about sub patterns we are processing that
2508 need to be handled seperately/specially in study_chunk. Its so
2509 we can simulate recursion without losing state. */
2511 typedef struct scan_frame {
2512 regnode *last; /* last node to process in this frame */
2513 regnode *next; /* next node to process when last is reached */
2514 struct scan_frame *prev; /*previous frame*/
2515 I32 stop; /* what stopparen do we use */
2519 #define SCAN_COMMIT(s, data, m) scan_commit(s, data, m, is_inf)
2521 #define CASE_SYNST_FNC(nAmE) \
2523 if (flags & SCF_DO_STCLASS_AND) { \
2524 for (value = 0; value < 256; value++) \
2525 if (!is_ ## nAmE ## _cp(value)) \
2526 ANYOF_BITMAP_CLEAR(data->start_class, value); \
2529 for (value = 0; value < 256; value++) \
2530 if (is_ ## nAmE ## _cp(value)) \
2531 ANYOF_BITMAP_SET(data->start_class, value); \
2535 if (flags & SCF_DO_STCLASS_AND) { \
2536 for (value = 0; value < 256; value++) \
2537 if (is_ ## nAmE ## _cp(value)) \
2538 ANYOF_BITMAP_CLEAR(data->start_class, value); \
2541 for (value = 0; value < 256; value++) \
2542 if (!is_ ## nAmE ## _cp(value)) \
2543 ANYOF_BITMAP_SET(data->start_class, value); \
2550 S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp,
2551 I32 *minlenp, I32 *deltap,
2556 struct regnode_charclass_class *and_withp,
2557 U32 flags, U32 depth)
2558 /* scanp: Start here (read-write). */
2559 /* deltap: Write maxlen-minlen here. */
2560 /* last: Stop before this one. */
2561 /* data: string data about the pattern */
2562 /* stopparen: treat close N as END */
2563 /* recursed: which subroutines have we recursed into */
2564 /* and_withp: Valid if flags & SCF_DO_STCLASS_OR */
2567 I32 min = 0, pars = 0, code;
2568 regnode *scan = *scanp, *next;
2570 int is_inf = (flags & SCF_DO_SUBSTR) && (data->flags & SF_IS_INF);
2571 int is_inf_internal = 0; /* The studied chunk is infinite */
2572 I32 is_par = OP(scan) == OPEN ? ARG(scan) : 0;
2573 scan_data_t data_fake;
2574 SV *re_trie_maxbuff = NULL;
2575 regnode *first_non_open = scan;
2576 I32 stopmin = I32_MAX;
2577 scan_frame *frame = NULL;
2578 GET_RE_DEBUG_FLAGS_DECL;
2580 PERL_ARGS_ASSERT_STUDY_CHUNK;
2583 StructCopy(&zero_scan_data, &data_fake, scan_data_t);
2587 while (first_non_open && OP(first_non_open) == OPEN)
2588 first_non_open=regnext(first_non_open);
2593 while ( scan && OP(scan) != END && scan < last ){
2594 /* Peephole optimizer: */
2595 DEBUG_STUDYDATA("Peep:", data,depth);
2596 DEBUG_PEEP("Peep",scan,depth);
2597 JOIN_EXACT(scan,&min,0);
2599 /* Follow the next-chain of the current node and optimize
2600 away all the NOTHINGs from it. */
2601 if (OP(scan) != CURLYX) {
2602 const int max = (reg_off_by_arg[OP(scan)]
2604 /* I32 may be smaller than U16 on CRAYs! */
2605 : (I32_MAX < U16_MAX ? I32_MAX : U16_MAX));
2606 int off = (reg_off_by_arg[OP(scan)] ? ARG(scan) : NEXT_OFF(scan));
2610 /* Skip NOTHING and LONGJMP. */
2611 while ((n = regnext(n))
2612 && ((PL_regkind[OP(n)] == NOTHING && (noff = NEXT_OFF(n)))
2613 || ((OP(n) == LONGJMP) && (noff = ARG(n))))
2614 && off + noff < max)
2616 if (reg_off_by_arg[OP(scan)])
2619 NEXT_OFF(scan) = off;
2624 /* The principal pseudo-switch. Cannot be a switch, since we
2625 look into several different things. */
2626 if (OP(scan) == BRANCH || OP(scan) == BRANCHJ
2627 || OP(scan) == IFTHEN) {
2628 next = regnext(scan);
2630 /* demq: the op(next)==code check is to see if we have "branch-branch" AFAICT */
2632 if (OP(next) == code || code == IFTHEN) {
2633 /* NOTE - There is similar code to this block below for handling
2634 TRIE nodes on a re-study. If you change stuff here check there
2636 I32 max1 = 0, min1 = I32_MAX, num = 0;
2637 struct regnode_charclass_class accum;
2638 regnode * const startbranch=scan;
2640 if (flags & SCF_DO_SUBSTR)
2641 SCAN_COMMIT(pRExC_state, data, minlenp); /* Cannot merge strings after this. */
2642 if (flags & SCF_DO_STCLASS)
2643 cl_init_zero(pRExC_state, &accum);
2645 while (OP(scan) == code) {
2646 I32 deltanext, minnext, f = 0, fake;
2647 struct regnode_charclass_class this_class;
2650 data_fake.flags = 0;
2652 data_fake.whilem_c = data->whilem_c;
2653 data_fake.last_closep = data->last_closep;
2656 data_fake.last_closep = &fake;
2658 data_fake.pos_delta = delta;
2659 next = regnext(scan);
2660 scan = NEXTOPER(scan);
2662 scan = NEXTOPER(scan);
2663 if (flags & SCF_DO_STCLASS) {
2664 cl_init(pRExC_state, &this_class);
2665 data_fake.start_class = &this_class;
2666 f = SCF_DO_STCLASS_AND;
2668 if (flags & SCF_WHILEM_VISITED_POS)
2669 f |= SCF_WHILEM_VISITED_POS;
2671 /* we suppose the run is continuous, last=next...*/
2672 minnext = study_chunk(pRExC_state, &scan, minlenp, &deltanext,
2674 stopparen, recursed, NULL, f,depth+1);
2677 if (max1 < minnext + deltanext)
2678 max1 = minnext + deltanext;
2679 if (deltanext == I32_MAX)
2680 is_inf = is_inf_internal = 1;
2682 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
2684 if (data_fake.flags & SCF_SEEN_ACCEPT) {
2685 if ( stopmin > minnext)
2686 stopmin = min + min1;
2687 flags &= ~SCF_DO_SUBSTR;
2689 data->flags |= SCF_SEEN_ACCEPT;
2692 if (data_fake.flags & SF_HAS_EVAL)
2693 data->flags |= SF_HAS_EVAL;
2694 data->whilem_c = data_fake.whilem_c;
2696 if (flags & SCF_DO_STCLASS)
2697 cl_or(pRExC_state, &accum, &this_class);
2699 if (code == IFTHEN && num < 2) /* Empty ELSE branch */
2701 if (flags & SCF_DO_SUBSTR) {
2702 data->pos_min += min1;
2703 data->pos_delta += max1 - min1;
2704 if (max1 != min1 || is_inf)
2705 data->longest = &(data->longest_float);
2708 delta += max1 - min1;
2709 if (flags & SCF_DO_STCLASS_OR) {
2710 cl_or(pRExC_state, data->start_class, &accum);
2712 cl_and(data->start_class, and_withp);
2713 flags &= ~SCF_DO_STCLASS;
2716 else if (flags & SCF_DO_STCLASS_AND) {
2718 cl_and(data->start_class, &accum);
2719 flags &= ~SCF_DO_STCLASS;
2722 /* Switch to OR mode: cache the old value of
2723 * data->start_class */
2725 StructCopy(data->start_class, and_withp,
2726 struct regnode_charclass_class);
2727 flags &= ~SCF_DO_STCLASS_AND;
2728 StructCopy(&accum, data->start_class,
2729 struct regnode_charclass_class);
2730 flags |= SCF_DO_STCLASS_OR;
2731 data->start_class->flags |= ANYOF_EOS;
2735 if (PERL_ENABLE_TRIE_OPTIMISATION && OP( startbranch ) == BRANCH ) {
2738 Assuming this was/is a branch we are dealing with: 'scan' now
2739 points at the item that follows the branch sequence, whatever
2740 it is. We now start at the beginning of the sequence and look
2747 which would be constructed from a pattern like /A|LIST|OF|WORDS/
2749 If we can find such a subseqence we need to turn the first
2750 element into a trie and then add the subsequent branch exact
2751 strings to the trie.
2755 1. patterns where the whole set of branch can be converted.
2757 2. patterns where only a subset can be converted.
2759 In case 1 we can replace the whole set with a single regop
2760 for the trie. In case 2 we need to keep the start and end
2763 'BRANCH EXACT; BRANCH EXACT; BRANCH X'
2764 becomes BRANCH TRIE; BRANCH X;
2766 There is an additional case, that being where there is a
2767 common prefix, which gets split out into an EXACT like node
2768 preceding the TRIE node.
2770 If x(1..n)==tail then we can do a simple trie, if not we make
2771 a "jump" trie, such that when we match the appropriate word
2772 we "jump" to the appopriate tail node. Essentailly we turn
2773 a nested if into a case structure of sorts.
2778 if (!re_trie_maxbuff) {
2779 re_trie_maxbuff = get_sv(RE_TRIE_MAXBUF_NAME, 1);
2780 if (!SvIOK(re_trie_maxbuff))
2781 sv_setiv(re_trie_maxbuff, RE_TRIE_MAXBUF_INIT);
2783 if ( SvIV(re_trie_maxbuff)>=0 ) {
2785 regnode *first = (regnode *)NULL;
2786 regnode *last = (regnode *)NULL;
2787 regnode *tail = scan;
2792 SV * const mysv = sv_newmortal(); /* for dumping */
2794 /* var tail is used because there may be a TAIL
2795 regop in the way. Ie, the exacts will point to the
2796 thing following the TAIL, but the last branch will
2797 point at the TAIL. So we advance tail. If we
2798 have nested (?:) we may have to move through several
2802 while ( OP( tail ) == TAIL ) {
2803 /* this is the TAIL generated by (?:) */
2804 tail = regnext( tail );
2809 regprop(RExC_rx, mysv, tail );
2810 PerlIO_printf( Perl_debug_log, "%*s%s%s\n",
2811 (int)depth * 2 + 2, "",
2812 "Looking for TRIE'able sequences. Tail node is: ",
2813 SvPV_nolen_const( mysv )
2819 step through the branches, cur represents each
2820 branch, noper is the first thing to be matched
2821 as part of that branch and noper_next is the
2822 regnext() of that node. if noper is an EXACT
2823 and noper_next is the same as scan (our current
2824 position in the regex) then the EXACT branch is
2825 a possible optimization target. Once we have
2826 two or more consequetive such branches we can
2827 create a trie of the EXACT's contents and stich
2828 it in place. If the sequence represents all of
2829 the branches we eliminate the whole thing and
2830 replace it with a single TRIE. If it is a
2831 subsequence then we need to stitch it in. This
2832 means the first branch has to remain, and needs
2833 to be repointed at the item on the branch chain
2834 following the last branch optimized. This could
2835 be either a BRANCH, in which case the
2836 subsequence is internal, or it could be the
2837 item following the branch sequence in which
2838 case the subsequence is at the end.
2842 /* dont use tail as the end marker for this traverse */
2843 for ( cur = startbranch ; cur != scan ; cur = regnext( cur ) ) {
2844 regnode * const noper = NEXTOPER( cur );
2845 #if defined(DEBUGGING) || defined(NOJUMPTRIE)
2846 regnode * const noper_next = regnext( noper );
2850 regprop(RExC_rx, mysv, cur);
2851 PerlIO_printf( Perl_debug_log, "%*s- %s (%d)",
2852 (int)depth * 2 + 2,"", SvPV_nolen_const( mysv ), REG_NODE_NUM(cur) );
2854 regprop(RExC_rx, mysv, noper);
2855 PerlIO_printf( Perl_debug_log, " -> %s",
2856 SvPV_nolen_const(mysv));
2859 regprop(RExC_rx, mysv, noper_next );
2860 PerlIO_printf( Perl_debug_log,"\t=> %s\t",
2861 SvPV_nolen_const(mysv));
2863 PerlIO_printf( Perl_debug_log, "(First==%d,Last==%d,Cur==%d)\n",
2864 REG_NODE_NUM(first), REG_NODE_NUM(last), REG_NODE_NUM(cur) );
2866 if ( (((first && optype!=NOTHING) ? OP( noper ) == optype
2867 : PL_regkind[ OP( noper ) ] == EXACT )
2868 || OP(noper) == NOTHING )
2870 && noper_next == tail
2875 if ( !first || optype == NOTHING ) {
2876 if (!first) first = cur;
2877 optype = OP( noper );
2883 Currently we do not believe that the trie logic can
2884 handle case insensitive matching properly when the
2885 pattern is not unicode (thus forcing unicode semantics).
2887 If/when this is fixed the following define can be swapped
2888 in below to fully enable trie logic.
2890 #define TRIE_TYPE_IS_SAFE 1
2893 #define TRIE_TYPE_IS_SAFE (UTF || optype==EXACT)
2895 if ( last && TRIE_TYPE_IS_SAFE ) {
2896 make_trie( pRExC_state,
2897 startbranch, first, cur, tail, count,
2900 if ( PL_regkind[ OP( noper ) ] == EXACT
2902 && noper_next == tail
2907 optype = OP( noper );
2917 regprop(RExC_rx, mysv, cur);
2918 PerlIO_printf( Perl_debug_log,
2919 "%*s- %s (%d) <SCAN FINISHED>\n", (int)depth * 2 + 2,
2920 "", SvPV_nolen_const( mysv ),REG_NODE_NUM(cur));
2924 if ( last && TRIE_TYPE_IS_SAFE ) {
2925 made= make_trie( pRExC_state, startbranch, first, scan, tail, count, optype, depth+1 );
2926 #ifdef TRIE_STUDY_OPT
2927 if ( ((made == MADE_EXACT_TRIE &&
2928 startbranch == first)
2929 || ( first_non_open == first )) &&
2931 flags |= SCF_TRIE_RESTUDY;
2932 if ( startbranch == first
2935 RExC_seen &=~REG_TOP_LEVEL_BRANCHES;
2945 else if ( code == BRANCHJ ) { /* single branch is optimized. */
2946 scan = NEXTOPER(NEXTOPER(scan));
2947 } else /* single branch is optimized. */
2948 scan = NEXTOPER(scan);
2950 } else if (OP(scan) == SUSPEND || OP(scan) == GOSUB || OP(scan) == GOSTART) {
2951 scan_frame *newframe = NULL;
2956 if (OP(scan) != SUSPEND) {
2957 /* set the pointer */
2958 if (OP(scan) == GOSUB) {
2960 RExC_recurse[ARG2L(scan)] = scan;
2961 start = RExC_open_parens[paren-1];
2962 end = RExC_close_parens[paren-1];
2965 start = RExC_rxi->program + 1;
2969 Newxz(recursed, (((RExC_npar)>>3) +1), U8);
2970 SAVEFREEPV(recursed);
2972 if (!PAREN_TEST(recursed,paren+1)) {
2973 PAREN_SET(recursed,paren+1);
2974 Newx(newframe,1,scan_frame);
2976 if (flags & SCF_DO_SUBSTR) {
2977 SCAN_COMMIT(pRExC_state,data,minlenp);
2978 data->longest = &(data->longest_float);
2980 is_inf = is_inf_internal = 1;
2981 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
2982 cl_anything(pRExC_state, data->start_class);
2983 flags &= ~SCF_DO_STCLASS;
2986 Newx(newframe,1,scan_frame);
2989 end = regnext(scan);
2994 SAVEFREEPV(newframe);
2995 newframe->next = regnext(scan);
2996 newframe->last = last;
2997 newframe->stop = stopparen;
2998 newframe->prev = frame;
3008 else if (OP(scan) == EXACT) {
3009 I32 l = STR_LEN(scan);
3012 const U8 * const s = (U8*)STRING(scan);
3013 l = utf8_length(s, s + l);
3014 uc = utf8_to_uvchr(s, NULL);
3016 uc = *((U8*)STRING(scan));
3019 if (flags & SCF_DO_SUBSTR) { /* Update longest substr. */
3020 /* The code below prefers earlier match for fixed
3021 offset, later match for variable offset. */
3022 if (data->last_end == -1) { /* Update the start info. */
3023 data->last_start_min = data->pos_min;
3024 data->last_start_max = is_inf
3025 ? I32_MAX : data->pos_min + data->pos_delta;
3027 sv_catpvn(data->last_found, STRING(scan), STR_LEN(scan));
3029 SvUTF8_on(data->last_found);
3031 SV * const sv = data->last_found;
3032 MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
3033 mg_find(sv, PERL_MAGIC_utf8) : NULL;
3034 if (mg && mg->mg_len >= 0)
3035 mg->mg_len += utf8_length((U8*)STRING(scan),
3036 (U8*)STRING(scan)+STR_LEN(scan));
3038 data->last_end = data->pos_min + l;
3039 data->pos_min += l; /* As in the first entry. */
3040 data->flags &= ~SF_BEFORE_EOL;
3042 if (flags & SCF_DO_STCLASS_AND) {
3043 /* Check whether it is compatible with what we know already! */
3047 (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
3048 && !ANYOF_BITMAP_TEST(data->start_class, uc)
3049 && (!(data->start_class->flags & ANYOF_FOLD)
3050 || !ANYOF_BITMAP_TEST(data->start_class, PL_fold[uc])))
3053 ANYOF_CLASS_ZERO(data->start_class);
3054 ANYOF_BITMAP_ZERO(data->start_class);
3056 ANYOF_BITMAP_SET(data->start_class, uc);
3057 data->start_class->flags &= ~ANYOF_EOS;
3059 data->start_class->flags &= ~ANYOF_UNICODE_ALL;
3061 else if (flags & SCF_DO_STCLASS_OR) {
3062 /* false positive possible if the class is case-folded */
3064 ANYOF_BITMAP_SET(data->start_class, uc);
3066 data->start_class->flags |= ANYOF_UNICODE_ALL;
3067 data->start_class->flags &= ~ANYOF_EOS;
3068 cl_and(data->start_class, and_withp);
3070 flags &= ~SCF_DO_STCLASS;
3072 else if (PL_regkind[OP(scan)] == EXACT) { /* But OP != EXACT! */
3073 I32 l = STR_LEN(scan);
3074 UV uc = *((U8*)STRING(scan));
3076 /* Search for fixed substrings supports EXACT only. */
3077 if (flags & SCF_DO_SUBSTR) {
3079 SCAN_COMMIT(pRExC_state, data, minlenp);
3082 const U8 * const s = (U8 *)STRING(scan);
3083 l = utf8_length(s, s + l);
3084 uc = utf8_to_uvchr(s, NULL);
3087 if (flags & SCF_DO_SUBSTR)
3089 if (flags & SCF_DO_STCLASS_AND) {
3090 /* Check whether it is compatible with what we know already! */
3094 (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
3095 && !ANYOF_BITMAP_TEST(data->start_class, uc)
3096 && !ANYOF_BITMAP_TEST(data->start_class, PL_fold[uc])))
3098 ANYOF_CLASS_ZERO(data->start_class);
3099 ANYOF_BITMAP_ZERO(data->start_class);
3101 ANYOF_BITMAP_SET(data->start_class, uc);
3102 data->start_class->flags &= ~ANYOF_EOS;
3103 data->start_class->flags |= ANYOF_FOLD;
3104 if (OP(scan) == EXACTFL)
3105 data->start_class->flags |= ANYOF_LOCALE;
3108 else if (flags & SCF_DO_STCLASS_OR) {
3109 if (data->start_class->flags & ANYOF_FOLD) {
3110 /* false positive possible if the class is case-folded.
3111 Assume that the locale settings are the same... */
3113 ANYOF_BITMAP_SET(data->start_class, uc);
3114 data->start_class->flags &= ~ANYOF_EOS;
3116 cl_and(data->start_class, and_withp);
3118 flags &= ~SCF_DO_STCLASS;
3120 else if (REGNODE_VARIES(OP(scan))) {
3121 I32 mincount, maxcount, minnext, deltanext, fl = 0;
3122 I32 f = flags, pos_before = 0;
3123 regnode * const oscan = scan;
3124 struct regnode_charclass_class this_class;
3125 struct regnode_charclass_class *oclass = NULL;
3126 I32 next_is_eval = 0;
3128 switch (PL_regkind[OP(scan)]) {
3129 case WHILEM: /* End of (?:...)* . */
3130 scan = NEXTOPER(scan);
3133 if (flags & (SCF_DO_SUBSTR | SCF_DO_STCLASS)) {
3134 next = NEXTOPER(scan);
3135 if (OP(next) == EXACT || (flags & SCF_DO_STCLASS)) {
3137 maxcount = REG_INFTY;
3138 next = regnext(scan);
3139 scan = NEXTOPER(scan);
3143 if (flags & SCF_DO_SUBSTR)
3148 if (flags & SCF_DO_STCLASS) {
3150 maxcount = REG_INFTY;
3151 next = regnext(scan);
3152 scan = NEXTOPER(scan);
3155 is_inf = is_inf_internal = 1;
3156 scan = regnext(scan);
3157 if (flags & SCF_DO_SUBSTR) {
3158 SCAN_COMMIT(pRExC_state, data, minlenp); /* Cannot extend fixed substrings */
3159 data->longest = &(data->longest_float);
3161 goto optimize_curly_tail;
3163 if (stopparen>0 && (OP(scan)==CURLYN || OP(scan)==CURLYM)
3164 && (scan->flags == stopparen))
3169 mincount = ARG1(scan);
3170 maxcount = ARG2(scan);
3172 next = regnext(scan);
3173 if (OP(scan) == CURLYX) {
3174 I32 lp = (data ? *(data->last_closep) : 0);
3175 scan->flags = ((lp <= (I32)U8_MAX) ? (U8)lp : U8_MAX);
3177 scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS;
3178 next_is_eval = (OP(scan) == EVAL);
3180 if (flags & SCF_DO_SUBSTR) {
3181 if (mincount == 0) SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot extend fixed substrings */
3182 pos_before = data->pos_min;
3186 data->flags &= ~(SF_HAS_PAR|SF_IN_PAR|SF_HAS_EVAL);
3188 data->flags |= SF_IS_INF;
3190 if (flags & SCF_DO_STCLASS) {
3191 cl_init(pRExC_state, &this_class);
3192 oclass = data->start_class;
3193 data->start_class = &this_class;
3194 f |= SCF_DO_STCLASS_AND;
3195 f &= ~SCF_DO_STCLASS_OR;
3197 /* These are the cases when once a subexpression
3198 fails at a particular position, it cannot succeed
3199 even after backtracking at the enclosing scope.
3201 XXXX what if minimal match and we are at the
3202 initial run of {n,m}? */
3203 if ((mincount != maxcount - 1) && (maxcount != REG_INFTY))
3204 f &= ~SCF_WHILEM_VISITED_POS;
3206 /* This will finish on WHILEM, setting scan, or on NULL: */
3207 minnext = study_chunk(pRExC_state, &scan, minlenp, &deltanext,
3208 last, data, stopparen, recursed, NULL,
3210 ? (f & ~SCF_DO_SUBSTR) : f),depth+1);
3212 if (flags & SCF_DO_STCLASS)
3213 data->start_class = oclass;
3214 if (mincount == 0 || minnext == 0) {
3215 if (flags & SCF_DO_STCLASS_OR) {
3216 cl_or(pRExC_state, data->start_class, &this_class);
3218 else if (flags & SCF_DO_STCLASS_AND) {
3219 /* Switch to OR mode: cache the old value of
3220 * data->start_class */
3222 StructCopy(data->start_class, and_withp,
3223 struct regnode_charclass_class);
3224 flags &= ~SCF_DO_STCLASS_AND;
3225 StructCopy(&this_class, data->start_class,
3226 struct regnode_charclass_class);
3227 flags |= SCF_DO_STCLASS_OR;
3228 data->start_class->flags |= ANYOF_EOS;
3230 } else { /* Non-zero len */
3231 if (flags & SCF_DO_STCLASS_OR) {
3232 cl_or(pRExC_state, data->start_class, &this_class);
3233 cl_and(data->start_class, and_withp);
3235 else if (flags & SCF_DO_STCLASS_AND)
3236 cl_and(data->start_class, &this_class);
3237 flags &= ~SCF_DO_STCLASS;
3239 if (!scan) /* It was not CURLYX, but CURLY. */
3241 if ( /* ? quantifier ok, except for (?{ ... }) */
3242 (next_is_eval || !(mincount == 0 && maxcount == 1))
3243 && (minnext == 0) && (deltanext == 0)
3244 && data && !(data->flags & (SF_HAS_PAR|SF_IN_PAR))
3245 && maxcount <= REG_INFTY/3) /* Complement check for big count */
3247 ckWARNreg(RExC_parse,
3248 "Quantifier unexpected on zero-length expression");
3251 min += minnext * mincount;
3252 is_inf_internal |= ((maxcount == REG_INFTY
3253 && (minnext + deltanext) > 0)
3254 || deltanext == I32_MAX);
3255 is_inf |= is_inf_internal;
3256 delta += (minnext + deltanext) * maxcount - minnext * mincount;
3258 /* Try powerful optimization CURLYX => CURLYN. */
3259 if ( OP(oscan) == CURLYX && data
3260 && data->flags & SF_IN_PAR
3261 && !(data->flags & SF_HAS_EVAL)
3262 && !deltanext && minnext == 1 ) {
3263 /* Try to optimize to CURLYN. */
3264 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS;
3265 regnode * const nxt1 = nxt;
3272 if (!REGNODE_SIMPLE(OP(nxt))
3273 && !(PL_regkind[OP(nxt)] == EXACT
3274 && STR_LEN(nxt) == 1))
3280 if (OP(nxt) != CLOSE)
3282 if (RExC_open_parens) {
3283 RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
3284 RExC_close_parens[ARG(nxt1)-1]=nxt+2; /*close->while*/
3286 /* Now we know that nxt2 is the only contents: */
3287 oscan->flags = (U8)ARG(nxt);
3289 OP(nxt1) = NOTHING; /* was OPEN. */
3292 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
3293 NEXT_OFF(nxt1+ 1) = 0; /* just for consistancy. */
3294 NEXT_OFF(nxt2) = 0; /* just for consistancy with CURLY. */
3295 OP(nxt) = OPTIMIZED; /* was CLOSE. */
3296 OP(nxt + 1) = OPTIMIZED; /* was count. */
3297 NEXT_OFF(nxt+ 1) = 0; /* just for consistancy. */
3302 /* Try optimization CURLYX => CURLYM. */
3303 if ( OP(oscan) == CURLYX && data
3304 && !(data->flags & SF_HAS_PAR)
3305 && !(data->flags & SF_HAS_EVAL)
3306 && !deltanext /* atom is fixed width */
3307 && minnext != 0 /* CURLYM can't handle zero width */
3309 /* XXXX How to optimize if data == 0? */
3310 /* Optimize to a simpler form. */
3311 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN */
3315 while ( (nxt2 = regnext(nxt)) /* skip over embedded stuff*/
3316 && (OP(nxt2) != WHILEM))
3318 OP(nxt2) = SUCCEED; /* Whas WHILEM */
3319 /* Need to optimize away parenths. */
3320 if ((data->flags & SF_IN_PAR) && OP(nxt) == CLOSE) {
3321 /* Set the parenth number. */
3322 regnode *nxt1 = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN*/
3324 oscan->flags = (U8)ARG(nxt);
3325 if (RExC_open_parens) {
3326 RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
3327 RExC_close_parens[ARG(nxt1)-1]=nxt2+1; /*close->NOTHING*/
3329 OP(nxt1) = OPTIMIZED; /* was OPEN. */
3330 OP(nxt) = OPTIMIZED; /* was CLOSE. */
3333 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
3334 OP(nxt + 1) = OPTIMIZED; /* was count. */
3335 NEXT_OFF(nxt1 + 1) = 0; /* just for consistancy. */
3336 NEXT_OFF(nxt + 1) = 0; /* just for consistancy. */
3339 while ( nxt1 && (OP(nxt1) != WHILEM)) {
3340 regnode *nnxt = regnext(nxt1);
3343 if (reg_off_by_arg[OP(nxt1)])
3344 ARG_SET(nxt1, nxt2 - nxt1);
3345 else if (nxt2 - nxt1 < U16_MAX)
3346 NEXT_OFF(nxt1) = nxt2 - nxt1;
3348 OP(nxt) = NOTHING; /* Cannot beautify */
3353 /* Optimize again: */
3354 study_chunk(pRExC_state, &nxt1, minlenp, &deltanext, nxt,
3355 NULL, stopparen, recursed, NULL, 0,depth+1);
3360 else if ((OP(oscan) == CURLYX)
3361 && (flags & SCF_WHILEM_VISITED_POS)
3362 /* See the comment on a similar expression above.
3363 However, this time it not a subexpression
3364 we care about, but the expression itself. */
3365 && (maxcount == REG_INFTY)
3366 && data && ++data->whilem_c < 16) {
3367 /* This stays as CURLYX, we can put the count/of pair. */
3368 /* Find WHILEM (as in regexec.c) */
3369 regnode *nxt = oscan + NEXT_OFF(oscan);
3371 if (OP(PREVOPER(nxt)) == NOTHING) /* LONGJMP */
3373 PREVOPER(nxt)->flags = (U8)(data->whilem_c
3374 | (RExC_whilem_seen << 4)); /* On WHILEM */
3376 if (data && fl & (SF_HAS_PAR|SF_IN_PAR))
3378 if (flags & SCF_DO_SUBSTR) {
3379 SV *last_str = NULL;
3380 int counted = mincount != 0;
3382 if (data->last_end > 0 && mincount != 0) { /* Ends with a string. */
3383 #if defined(SPARC64_GCC_WORKAROUND)
3386 const char *s = NULL;
3389 if (pos_before >= data->last_start_min)
3392 b = data->last_start_min;
3395 s = SvPV_const(data->last_found, l);
3396 old = b - data->last_start_min;
3399 I32 b = pos_before >= data->last_start_min
3400 ? pos_before : data->last_start_min;
3402 const char * const s = SvPV_const(data->last_found, l);
3403 I32 old = b - data->last_start_min;
3407 old = utf8_hop((U8*)s, old) - (U8*)s;
3410 /* Get the added string: */
3411 last_str = newSVpvn_utf8(s + old, l, UTF);
3412 if (deltanext == 0 && pos_before == b) {
3413 /* What was added is a constant string */
3415 SvGROW(last_str, (mincount * l) + 1);
3416 repeatcpy(SvPVX(last_str) + l,
3417 SvPVX_const(last_str), l, mincount - 1);
3418 SvCUR_set(last_str, SvCUR(last_str) * mincount);
3419 /* Add additional parts. */
3420 SvCUR_set(data->last_found,
3421 SvCUR(data->last_found) - l);
3422 sv_catsv(data->last_found, last_str);
3424 SV * sv = data->last_found;
3426 SvUTF8(sv) && SvMAGICAL(sv) ?
3427 mg_find(sv, PERL_MAGIC_utf8) : NULL;
3428 if (mg && mg->mg_len >= 0)
3429 mg->mg_len += CHR_SVLEN(last_str) - l;
3431 data->last_end += l * (mincount - 1);
3434 /* start offset must point into the last copy */
3435 data->last_start_min += minnext * (mincount - 1);
3436 data->last_start_max += is_inf ? I32_MAX
3437 : (maxcount - 1) * (minnext + data->pos_delta);
3440 /* It is counted once already... */
3441 data->pos_min += minnext * (mincount - counted);
3442 data->pos_delta += - counted * deltanext +
3443 (minnext + deltanext) * maxcount - minnext * mincount;
3444 if (mincount != maxcount) {
3445 /* Cannot extend fixed substrings found inside
3447 SCAN_COMMIT(pRExC_state,data,minlenp);
3448 if (mincount && last_str) {
3449 SV * const sv = data->last_found;
3450 MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
3451 mg_find(sv, PERL_MAGIC_utf8) : NULL;
3455 sv_setsv(sv, last_str);
3456 data->last_end = data->pos_min;
3457 data->last_start_min =
3458 data->pos_min - CHR_SVLEN(last_str);
3459 data->last_start_max = is_inf
3461 : data->pos_min + data->pos_delta
3462 - CHR_SVLEN(last_str);
3464 data->longest = &(data->longest_float);
3466 SvREFCNT_dec(last_str);
3468 if (data && (fl & SF_HAS_EVAL))
3469 data->flags |= SF_HAS_EVAL;
3470 optimize_curly_tail:
3471 if (OP(oscan) != CURLYX) {
3472 while (PL_regkind[OP(next = regnext(oscan))] == NOTHING
3474 NEXT_OFF(oscan) += NEXT_OFF(next);
3477 default: /* REF and CLUMP only? */
3478 if (flags & SCF_DO_SUBSTR) {
3479 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3480 data->longest = &(data->longest_float);
3482 is_inf = is_inf_internal = 1;
3483 if (flags & SCF_DO_STCLASS_OR)
3484 cl_anything(pRExC_state, data->start_class);
3485 flags &= ~SCF_DO_STCLASS;
3489 else if (OP(scan) == LNBREAK) {
3490 if (flags & SCF_DO_STCLASS) {
3492 data->start_class->flags &= ~ANYOF_EOS; /* No match on empty */
3493 if (flags & SCF_DO_STCLASS_AND) {
3494 for (value = 0; value < 256; value++)
3495 if (!is_VERTWS_cp(value))
3496 ANYOF_BITMAP_CLEAR(data->start_class, value);
3499 for (value = 0; value < 256; value++)
3500 if (is_VERTWS_cp(value))
3501 ANYOF_BITMAP_SET(data->start_class, value);
3503 if (flags & SCF_DO_STCLASS_OR)
3504 cl_and(data->start_class, and_withp);
3505 flags &= ~SCF_DO_STCLASS;
3509 if (flags & SCF_DO_SUBSTR) {
3510 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3512 data->pos_delta += 1;
3513 data->longest = &(data->longest_float);
3517 else if (OP(scan) == FOLDCHAR) {
3518 int d = ARG(scan)==0xDF ? 1 : 2;
3519 flags &= ~SCF_DO_STCLASS;
3522 if (flags & SCF_DO_SUBSTR) {
3523 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3525 data->pos_delta += d;
3526 data->longest = &(data->longest_float);
3529 else if (REGNODE_SIMPLE(OP(scan))) {
3532 if (flags & SCF_DO_SUBSTR) {
3533 SCAN_COMMIT(pRExC_state,data,minlenp);
3537 if (flags & SCF_DO_STCLASS) {
3538 data->start_class->flags &= ~ANYOF_EOS; /* No match on empty */
3540 /* Some of the logic below assumes that switching
3541 locale on will only add false positives. */
3542 switch (PL_regkind[OP(scan)]) {
3546 /* Perl_croak(aTHX_ "panic: unexpected simple REx opcode %d", OP(scan)); */
3547 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
3548 cl_anything(pRExC_state, data->start_class);
3551 if (OP(scan) == SANY)
3553 if (flags & SCF_DO_STCLASS_OR) { /* Everything but \n */
3554 value = (ANYOF_BITMAP_TEST(data->start_class,'\n')
3555 || (data->start_class->flags & ANYOF_CLASS));
3556 cl_anything(pRExC_state, data->start_class);
3558 if (flags & SCF_DO_STCLASS_AND || !value)
3559 ANYOF_BITMAP_CLEAR(data->start_class,'\n');
3562 if (flags & SCF_DO_STCLASS_AND)
3563 cl_and(data->start_class,
3564 (struct regnode_charclass_class*)scan);
3566 cl_or(pRExC_state, data->start_class,
3567 (struct regnode_charclass_class*)scan);
3570 if (flags & SCF_DO_STCLASS_AND) {
3571 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3572 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NALNUM);
3573 for (value = 0; value < 256; value++)
3574 if (!isALNUM(value))
3575 ANYOF_BITMAP_CLEAR(data->start_class, value);
3579 if (data->start_class->flags & ANYOF_LOCALE)
3580 ANYOF_CLASS_SET(data->start_class,ANYOF_ALNUM);
3582 for (value = 0; value < 256; value++)
3584 ANYOF_BITMAP_SET(data->start_class, value);
3589 if (flags & SCF_DO_STCLASS_AND) {
3590 if (data->start_class->flags & ANYOF_LOCALE)
3591 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NALNUM);
3594 ANYOF_CLASS_SET(data->start_class,ANYOF_ALNUM);
3595 data->start_class->flags |= ANYOF_LOCALE;
3599 if (flags & SCF_DO_STCLASS_AND) {
3600 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3601 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_ALNUM);
3602 for (value = 0; value < 256; value++)
3604 ANYOF_BITMAP_CLEAR(data->start_class, value);
3608 if (data->start_class->flags & ANYOF_LOCALE)
3609 ANYOF_CLASS_SET(data->start_class,ANYOF_NALNUM);
3611 for (value = 0; value < 256; value++)
3612 if (!isALNUM(value))
3613 ANYOF_BITMAP_SET(data->start_class, value);
3618 if (flags & SCF_DO_STCLASS_AND) {
3619 if (data->start_class->flags & ANYOF_LOCALE)
3620 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_ALNUM);
3623 data->start_class->flags |= ANYOF_LOCALE;
3624 ANYOF_CLASS_SET(data->start_class,ANYOF_NALNUM);
3628 if (flags & SCF_DO_STCLASS_AND) {
3629 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3630 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NSPACE);
3631 for (value = 0; value < 256; value++)
3632 if (!isSPACE(value))
3633 ANYOF_BITMAP_CLEAR(data->start_class, value);
3637 if (data->start_class->flags & ANYOF_LOCALE)
3638 ANYOF_CLASS_SET(data->start_class,ANYOF_SPACE);
3640 for (value = 0; value < 256; value++)
3642 ANYOF_BITMAP_SET(data->start_class, value);
3647 if (flags & SCF_DO_STCLASS_AND) {
3648 if (data->start_class->flags & ANYOF_LOCALE)
3649 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NSPACE);
3652 data->start_class->flags |= ANYOF_LOCALE;
3653 ANYOF_CLASS_SET(data->start_class,ANYOF_SPACE);
3657 if (flags & SCF_DO_STCLASS_AND) {
3658 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3659 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_SPACE);
3660 for (value = 0; value < 256; value++)
3662 ANYOF_BITMAP_CLEAR(data->start_class, value);
3666 if (data->start_class->flags & ANYOF_LOCALE)
3667 ANYOF_CLASS_SET(data->start_class,ANYOF_NSPACE);
3669 for (value = 0; value < 256; value++)
3670 if (!isSPACE(value))
3671 ANYOF_BITMAP_SET(data->start_class, value);
3676 if (flags & SCF_DO_STCLASS_AND) {
3677 if (data->start_class->flags & ANYOF_LOCALE) {
3678 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_SPACE);
3679 for (value = 0; value < 256; value++)
3680 if (!isSPACE(value))
3681 ANYOF_BITMAP_CLEAR(data->start_class, value);
3685 data->start_class->flags |= ANYOF_LOCALE;
3686 ANYOF_CLASS_SET(data->start_class,ANYOF_NSPACE);
3690 if (flags & SCF_DO_STCLASS_AND) {
3691 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NDIGIT);
3692 for (value = 0; value < 256; value++)
3693 if (!isDIGIT(value))
3694 ANYOF_BITMAP_CLEAR(data->start_class, value);
3697 if (data->start_class->flags & ANYOF_LOCALE)
3698 ANYOF_CLASS_SET(data->start_class,ANYOF_DIGIT);
3700 for (value = 0; value < 256; value++)
3702 ANYOF_BITMAP_SET(data->start_class, value);
3707 if (flags & SCF_DO_STCLASS_AND) {
3708 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_DIGIT);
3709 for (value = 0; value < 256; value++)
3711 ANYOF_BITMAP_CLEAR(data->start_class, value);
3714 if (data->start_class->flags & ANYOF_LOCALE)
3715 ANYOF_CLASS_SET(data->start_class,ANYOF_NDIGIT);
3717 for (value = 0; value < 256; value++)
3718 if (!isDIGIT(value))
3719 ANYOF_BITMAP_SET(data->start_class, value);
3723 CASE_SYNST_FNC(VERTWS);
3724 CASE_SYNST_FNC(HORIZWS);
3727 if (flags & SCF_DO_STCLASS_OR)
3728 cl_and(data->start_class, and_withp);
3729 flags &= ~SCF_DO_STCLASS;
3732 else if (PL_regkind[OP(scan)] == EOL && flags & SCF_DO_SUBSTR) {
3733 data->flags |= (OP(scan) == MEOL
3737 else if ( PL_regkind[OP(scan)] == BRANCHJ
3738 /* Lookbehind, or need to calculate parens/evals/stclass: */
3739 && (scan->flags || data || (flags & SCF_DO_STCLASS))
3740 && (OP(scan) == IFMATCH || OP(scan) == UNLESSM)) {
3741 if ( !PERL_ENABLE_POSITIVE_ASSERTION_STUDY
3742 || OP(scan) == UNLESSM )
3744 /* Negative Lookahead/lookbehind
3745 In this case we can't do fixed string optimisation.
3748 I32 deltanext, minnext, fake = 0;
3750 struct regnode_charclass_class intrnl;
3753 data_fake.flags = 0;
3755 data_fake.whilem_c = data->whilem_c;
3756 data_fake.last_closep = data->last_closep;
3759 data_fake.last_closep = &fake;
3760 data_fake.pos_delta = delta;
3761 if ( flags & SCF_DO_STCLASS && !scan->flags
3762 && OP(scan) == IFMATCH ) { /* Lookahead */
3763 cl_init(pRExC_state, &intrnl);
3764 data_fake.start_class = &intrnl;
3765 f |= SCF_DO_STCLASS_AND;
3767 if (flags & SCF_WHILEM_VISITED_POS)
3768 f |= SCF_WHILEM_VISITED_POS;
3769 next = regnext(scan);
3770 nscan = NEXTOPER(NEXTOPER(scan));
3771 minnext = study_chunk(pRExC_state, &nscan, minlenp, &deltanext,
3772 last, &data_fake, stopparen, recursed, NULL, f, depth+1);
3775 FAIL("Variable length lookbehind not implemented");
3777 else if (minnext > (I32)U8_MAX) {
3778 FAIL2("Lookbehind longer than %"UVuf" not implemented", (UV)U8_MAX);
3780 scan->flags = (U8)minnext;
3783 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3785 if (data_fake.flags & SF_HAS_EVAL)
3786 data->flags |= SF_HAS_EVAL;
3787 data->whilem_c = data_fake.whilem_c;
3789 if (f & SCF_DO_STCLASS_AND) {
3790 if (flags & SCF_DO_STCLASS_OR) {
3791 /* OR before, AND after: ideally we would recurse with
3792 * data_fake to get the AND applied by study of the
3793 * remainder of the pattern, and then derecurse;
3794 * *** HACK *** for now just treat as "no information".
3795 * See [perl #56690].
3797 cl_init(pRExC_state, data->start_class);
3799 /* AND before and after: combine and continue */
3800 const int was = (data->start_class->flags & ANYOF_EOS);
3802 cl_and(data->start_class, &intrnl);
3804 data->start_class->flags |= ANYOF_EOS;
3808 #if PERL_ENABLE_POSITIVE_ASSERTION_STUDY
3810 /* Positive Lookahead/lookbehind
3811 In this case we can do fixed string optimisation,
3812 but we must be careful about it. Note in the case of
3813 lookbehind the positions will be offset by the minimum
3814 length of the pattern, something we won't know about
3815 until after the recurse.
3817 I32 deltanext, fake = 0;
3819 struct regnode_charclass_class intrnl;
3821 /* We use SAVEFREEPV so that when the full compile
3822 is finished perl will clean up the allocated
3823 minlens when its all done. This was we don't
3824 have to worry about freeing them when we know
3825 they wont be used, which would be a pain.
3828 Newx( minnextp, 1, I32 );
3829 SAVEFREEPV(minnextp);
3832 StructCopy(data, &data_fake, scan_data_t);
3833 if ((flags & SCF_DO_SUBSTR) && data->last_found) {
3836 SCAN_COMMIT(pRExC_state, &data_fake,minlenp);
3837 data_fake.last_found=newSVsv(data->last_found);
3841 data_fake.last_closep = &fake;
3842 data_fake.flags = 0;
3843 data_fake.pos_delta = delta;
3845 data_fake.flags |= SF_IS_INF;
3846 if ( flags & SCF_DO_STCLASS && !scan->flags
3847 && OP(scan) == IFMATCH ) { /* Lookahead */
3848 cl_init(pRExC_state, &intrnl);
3849 data_fake.start_class = &intrnl;
3850 f |= SCF_DO_STCLASS_AND;
3852 if (flags & SCF_WHILEM_VISITED_POS)
3853 f |= SCF_WHILEM_VISITED_POS;
3854 next = regnext(scan);
3855 nscan = NEXTOPER(NEXTOPER(scan));
3857 *minnextp = study_chunk(pRExC_state, &nscan, minnextp, &deltanext,
3858 last, &data_fake, stopparen, recursed, NULL, f,depth+1);
3861 FAIL("Variable length lookbehind not implemented");
3863 else if (*minnextp > (I32)U8_MAX) {
3864 FAIL2("Lookbehind longer than %"UVuf" not implemented", (UV)U8_MAX);
3866 scan->flags = (U8)*minnextp;
3871 if (f & SCF_DO_STCLASS_AND) {
3872 const int was = (data->start_class->flags & ANYOF_EOS);
3874 cl_and(data->start_class, &intrnl);
3876 data->start_class->flags |= ANYOF_EOS;
3879 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3881 if (data_fake.flags & SF_HAS_EVAL)
3882 data->flags |= SF_HAS_EVAL;
3883 data->whilem_c = data_fake.whilem_c;
3884 if ((flags & SCF_DO_SUBSTR) && data_fake.last_found) {
3885 if (RExC_rx->minlen<*minnextp)
3886 RExC_rx->minlen=*minnextp;
3887 SCAN_COMMIT(pRExC_state, &data_fake, minnextp);
3888 SvREFCNT_dec(data_fake.last_found);
3890 if ( data_fake.minlen_fixed != minlenp )
3892 data->offset_fixed= data_fake.offset_fixed;
3893 data->minlen_fixed= data_fake.minlen_fixed;
3894 data->lookbehind_fixed+= scan->flags;
3896 if ( data_fake.minlen_float != minlenp )
3898 data->minlen_float= data_fake.minlen_float;
3899 data->offset_float_min=data_fake.offset_float_min;
3900 data->offset_float_max=data_fake.offset_float_max;
3901 data->lookbehind_float+= scan->flags;
3910 else if (OP(scan) == OPEN) {
3911 if (stopparen != (I32)ARG(scan))
3914 else if (OP(scan) == CLOSE) {
3915 if (stopparen == (I32)ARG(scan)) {
3918 if ((I32)ARG(scan) == is_par) {
3919 next = regnext(scan);
3921 if ( next && (OP(next) != WHILEM) && next < last)
3922 is_par = 0; /* Disable optimization */
3925 *(data->last_closep) = ARG(scan);
3927 else if (OP(scan) == EVAL) {
3929 data->flags |= SF_HAS_EVAL;
3931 else if ( PL_regkind[OP(scan)] == ENDLIKE ) {
3932 if (flags & SCF_DO_SUBSTR) {
3933 SCAN_COMMIT(pRExC_state,data,minlenp);
3934 flags &= ~SCF_DO_SUBSTR;
3936 if (data && OP(scan)==ACCEPT) {
3937 data->flags |= SCF_SEEN_ACCEPT;
3942 else if (OP(scan) == LOGICAL && scan->flags == 2) /* Embedded follows */
3944 if (flags & SCF_DO_SUBSTR) {
3945 SCAN_COMMIT(pRExC_state,data,minlenp);
3946 data->longest = &(data->longest_float);
3948 is_inf = is_inf_internal = 1;
3949 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
3950 cl_anything(pRExC_state, data->start_class);
3951 flags &= ~SCF_DO_STCLASS;
3953 else if (OP(scan) == GPOS) {
3954 if (!(RExC_rx->extflags & RXf_GPOS_FLOAT) &&
3955 !(delta || is_inf || (data && data->pos_delta)))
3957 if (!(RExC_rx->extflags & RXf_ANCH) && (flags & SCF_DO_SUBSTR))
3958 RExC_rx->extflags |= RXf_ANCH_GPOS;
3959 if (RExC_rx->gofs < (U32)min)
3960 RExC_rx->gofs = min;
3962 RExC_rx->extflags |= RXf_GPOS_FLOAT;
3966 #ifdef TRIE_STUDY_OPT
3967 #ifdef FULL_TRIE_STUDY
3968 else if (PL_regkind[OP(scan)] == TRIE) {
3969 /* NOTE - There is similar code to this block above for handling
3970 BRANCH nodes on the initial study. If you change stuff here
3972 regnode *trie_node= scan;
3973 regnode *tail= regnext(scan);
3974 reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
3975 I32 max1 = 0, min1 = I32_MAX;
3976 struct regnode_charclass_class accum;
3978 if (flags & SCF_DO_SUBSTR) /* XXXX Add !SUSPEND? */
3979 SCAN_COMMIT(pRExC_state, data,minlenp); /* Cannot merge strings after this. */
3980 if (flags & SCF_DO_STCLASS)
3981 cl_init_zero(pRExC_state, &accum);
3987 const regnode *nextbranch= NULL;
3990 for ( word=1 ; word <= trie->wordcount ; word++)
3992 I32 deltanext=0, minnext=0, f = 0, fake;
3993 struct regnode_charclass_class this_class;
3995 data_fake.flags = 0;
3997 data_fake.whilem_c = data->whilem_c;
3998 data_fake.last_closep = data->last_closep;
4001 data_fake.last_closep = &fake;
4002 data_fake.pos_delta = delta;
4003 if (flags & SCF_DO_STCLASS) {
4004 cl_init(pRExC_state, &this_class);
4005 data_fake.start_class = &this_class;
4006 f = SCF_DO_STCLASS_AND;
4008 if (flags & SCF_WHILEM_VISITED_POS)
4009 f |= SCF_WHILEM_VISITED_POS;
4011 if (trie->jump[word]) {
4013 nextbranch = trie_node + trie->jump[0];
4014 scan= trie_node + trie->jump[word];
4015 /* We go from the jump point to the branch that follows
4016 it. Note this means we need the vestigal unused branches
4017 even though they arent otherwise used.
4019 minnext = study_chunk(pRExC_state, &scan, minlenp,
4020 &deltanext, (regnode *)nextbranch, &data_fake,
4021 stopparen, recursed, NULL, f,depth+1);
4023 if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
4024 nextbranch= regnext((regnode*)nextbranch);
4026 if (min1 > (I32)(minnext + trie->minlen))
4027 min1 = minnext + trie->minlen;
4028 if (max1 < (I32)(minnext + deltanext + trie->maxlen))
4029 max1 = minnext + deltanext + trie->maxlen;
4030 if (deltanext == I32_MAX)
4031 is_inf = is_inf_internal = 1;
4033 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
4035 if (data_fake.flags & SCF_SEEN_ACCEPT) {
4036 if ( stopmin > min + min1)
4037 stopmin = min + min1;
4038 flags &= ~SCF_DO_SUBSTR;
4040 data->flags |= SCF_SEEN_ACCEPT;
4043 if (data_fake.flags & SF_HAS_EVAL)
4044 data->flags |= SF_HAS_EVAL;
4045 data->whilem_c = data_fake.whilem_c;
4047 if (flags & SCF_DO_STCLASS)
4048 cl_or(pRExC_state, &accum, &this_class);
4051 if (flags & SCF_DO_SUBSTR) {
4052 data->pos_min += min1;
4053 data->pos_delta += max1 - min1;
4054 if (max1 != min1 || is_inf)
4055 data->longest = &(data->longest_float);
4058 delta += max1 - min1;
4059 if (flags & SCF_DO_STCLASS_OR) {
4060 cl_or(pRExC_state, data->start_class, &accum);
4062 cl_and(data->start_class, and_withp);
4063 flags &= ~SCF_DO_STCLASS;
4066 else if (flags & SCF_DO_STCLASS_AND) {
4068 cl_and(data->start_class, &accum);
4069 flags &= ~SCF_DO_STCLASS;
4072 /* Switch to OR mode: cache the old value of
4073 * data->start_class */
4075 StructCopy(data->start_class, and_withp,
4076 struct regnode_charclass_class);
4077 flags &= ~SCF_DO_STCLASS_AND;
4078 StructCopy(&accum, data->start_class,
4079 struct regnode_charclass_class);
4080 flags |= SCF_DO_STCLASS_OR;
4081 data->start_class->flags |= ANYOF_EOS;
4088 else if (PL_regkind[OP(scan)] == TRIE) {
4089 reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
4092 min += trie->minlen;
4093 delta += (trie->maxlen - trie->minlen);
4094 flags &= ~SCF_DO_STCLASS; /* xxx */
4095 if (flags & SCF_DO_SUBSTR) {
4096 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
4097 data->pos_min += trie->minlen;
4098 data->pos_delta += (trie->maxlen - trie->minlen);
4099 if (trie->maxlen != trie->minlen)
4100 data->longest = &(data->longest_float);
4102 if (trie->jump) /* no more substrings -- for now /grr*/
4103 flags &= ~SCF_DO_SUBSTR;
4105 #endif /* old or new */
4106 #endif /* TRIE_STUDY_OPT */
4108 /* Else: zero-length, ignore. */
4109 scan = regnext(scan);
4114 stopparen = frame->stop;
4115 frame = frame->prev;
4116 goto fake_study_recurse;
4121 DEBUG_STUDYDATA("pre-fin:",data,depth);
4124 *deltap = is_inf_internal ? I32_MAX : delta;
4125 if (flags & SCF_DO_SUBSTR && is_inf)
4126 data->pos_delta = I32_MAX - data->pos_min;
4127 if (is_par > (I32)U8_MAX)
4129 if (is_par && pars==1 && data) {
4130 data->flags |= SF_IN_PAR;
4131 data->flags &= ~SF_HAS_PAR;
4133 else if (pars && data) {
4134 data->flags |= SF_HAS_PAR;
4135 data->flags &= ~SF_IN_PAR;
4137 if (flags & SCF_DO_STCLASS_OR)
4138 cl_and(data->start_class, and_withp);
4139 if (flags & SCF_TRIE_RESTUDY)
4140 data->flags |= SCF_TRIE_RESTUDY;
4142 DEBUG_STUDYDATA("post-fin:",data,depth);
4144 return min < stopmin ? min : stopmin;
4148 S_add_data(RExC_state_t *pRExC_state, U32 n, const char *s)
4150 U32 count = RExC_rxi->data ? RExC_rxi->data->count : 0;
4152 PERL_ARGS_ASSERT_ADD_DATA;
4154 Renewc(RExC_rxi->data,
4155 sizeof(*RExC_rxi->data) + sizeof(void*) * (count + n - 1),
4156 char, struct reg_data);
4158 Renew(RExC_rxi->data->what, count + n, U8);
4160 Newx(RExC_rxi->data->what, n, U8);
4161 RExC_rxi->data->count = count + n;
4162 Copy(s, RExC_rxi->data->what + count, n, U8);
4166 /*XXX: todo make this not included in a non debugging perl */
4167 #ifndef PERL_IN_XSUB_RE
4169 Perl_reginitcolors(pTHX)
4172 const char * const s = PerlEnv_getenv("PERL_RE_COLORS");
4174 char *t = savepv(s);
4178 t = strchr(t, '\t');
4184 PL_colors[i] = t = (char *)"";
4189 PL_colors[i++] = (char *)"";
4196 #ifdef TRIE_STUDY_OPT
4197 #define CHECK_RESTUDY_GOTO \
4199 (data.flags & SCF_TRIE_RESTUDY) \
4203 #define CHECK_RESTUDY_GOTO
4207 - pregcomp - compile a regular expression into internal code
4209 * We can't allocate space until we know how big the compiled form will be,
4210 * but we can't compile it (and thus know how big it is) until we've got a
4211 * place to put the code. So we cheat: we compile it twice, once with code
4212 * generation turned off and size counting turned on, and once "for real".
4213 * This also means that we don't allocate space until we are sure that the
4214 * thing really will compile successfully, and we never have to move the
4215 * code and thus invalidate pointers into it. (Note that it has to be in
4216 * one piece because free() must be able to free it all.) [NB: not true in perl]
4218 * Beware that the optimization-preparation code in here knows about some
4219 * of the structure of the compiled regexp. [I'll say.]
4224 #ifndef PERL_IN_XSUB_RE
4225 #define RE_ENGINE_PTR &reh_regexp_engine
4227 extern const struct regexp_engine my_reg_engine;
4228 #define RE_ENGINE_PTR &my_reg_engine
4231 #ifndef PERL_IN_XSUB_RE
4233 Perl_pregcomp(pTHX_ SV * const pattern, const U32 flags)
4236 HV * const table = GvHV(PL_hintgv);
4238 PERL_ARGS_ASSERT_PREGCOMP;
4240 /* Dispatch a request to compile a regexp to correct
4243 SV **ptr= hv_fetchs(table, "regcomp", FALSE);
4244 GET_RE_DEBUG_FLAGS_DECL;
4245 if (ptr && SvIOK(*ptr) && SvIV(*ptr)) {
4246 const regexp_engine *eng=INT2PTR(regexp_engine*,SvIV(*ptr));
4248 PerlIO_printf(Perl_debug_log, "Using engine %"UVxf"\n",
4251 return CALLREGCOMP_ENG(eng, pattern, flags);
4254 return Perl_re_compile(aTHX_ pattern, flags);
4259 Perl_re_compile(pTHX_ SV * const pattern, U32 pm_flags)
4264 register regexp_internal *ri;
4266 char *exp = SvPV(pattern, plen);
4267 char* xend = exp + plen;
4274 RExC_state_t RExC_state;
4275 RExC_state_t * const pRExC_state = &RExC_state;
4276 #ifdef TRIE_STUDY_OPT
4278 RExC_state_t copyRExC_state;
4280 GET_RE_DEBUG_FLAGS_DECL;
4282 PERL_ARGS_ASSERT_RE_COMPILE;
4284 DEBUG_r(if (!PL_colorset) reginitcolors());
4286 RExC_utf8 = RExC_orig_utf8 = SvUTF8(pattern);
4289 SV *dsv= sv_newmortal();
4290 RE_PV_QUOTED_DECL(s, RExC_utf8,
4291 dsv, exp, plen, 60);
4292 PerlIO_printf(Perl_debug_log, "%sCompiling REx%s %s\n",
4293 PL_colors[4],PL_colors[5],s);
4298 RExC_flags = pm_flags;
4302 RExC_seen_zerolen = *exp == '^' ? -1 : 0;
4303 RExC_seen_evals = 0;
4306 /* First pass: determine size, legality. */
4314 RExC_emit = &PL_regdummy;
4315 RExC_whilem_seen = 0;
4316 RExC_open_parens = NULL;
4317 RExC_close_parens = NULL;
4319 RExC_paren_names = NULL;
4321 RExC_paren_name_list = NULL;
4323 RExC_recurse = NULL;
4324 RExC_recurse_count = 0;
4326 #if 0 /* REGC() is (currently) a NOP at the first pass.
4327 * Clever compilers notice this and complain. --jhi */
4328 REGC((U8)REG_MAGIC, (char*)RExC_emit);
4330 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log, "Starting first pass (sizing)\n"));
4331 if (reg(pRExC_state, 0, &flags,1) == NULL) {
4332 RExC_precomp = NULL;
4335 if (RExC_utf8 && !RExC_orig_utf8) {
4336 /* It's possible to write a regexp in ascii that represents Unicode
4337 codepoints outside of the byte range, such as via \x{100}. If we
4338 detect such a sequence we have to convert the entire pattern to utf8
4339 and then recompile, as our sizing calculation will have been based
4340 on 1 byte == 1 character, but we will need to use utf8 to encode
4341 at least some part of the pattern, and therefore must convert the whole
4343 XXX: somehow figure out how to make this less expensive...
4346 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log,
4347 "UTF8 mismatch! Converting to utf8 for resizing and compile\n"));
4348 exp = (char*)Perl_bytes_to_utf8(aTHX_ (U8*)exp, &len);
4350 RExC_orig_utf8 = RExC_utf8;
4352 goto redo_first_pass;
4355 PerlIO_printf(Perl_debug_log,
4356 "Required size %"IVdf" nodes\n"
4357 "Starting second pass (creation)\n",
4360 RExC_lastparse=NULL;
4362 /* Small enough for pointer-storage convention?
4363 If extralen==0, this means that we will not need long jumps. */
4364 if (RExC_size >= 0x10000L && RExC_extralen)
4365 RExC_size += RExC_extralen;
4368 if (RExC_whilem_seen > 15)
4369 RExC_whilem_seen = 15;
4371 /* Allocate space and zero-initialize. Note, the two step process
4372 of zeroing when in debug mode, thus anything assigned has to
4373 happen after that */
4374 rx = (REGEXP*) newSV_type(SVt_REGEXP);
4375 r = (struct regexp*)SvANY(rx);
4376 Newxc(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode),
4377 char, regexp_internal);
4378 if ( r == NULL || ri == NULL )
4379 FAIL("Regexp out of space");
4381 /* avoid reading uninitialized memory in DEBUGGING code in study_chunk() */
4382 Zero(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode), char);
4384 /* bulk initialize base fields with 0. */
4385 Zero(ri, sizeof(regexp_internal), char);
4388 /* non-zero initialization begins here */
4390 r->engine= RE_ENGINE_PTR;
4391 r->extflags = pm_flags;
4393 bool has_p = ((r->extflags & RXf_PMf_KEEPCOPY) == RXf_PMf_KEEPCOPY);
4394 bool has_minus = ((r->extflags & RXf_PMf_STD_PMMOD) != RXf_PMf_STD_PMMOD);
4395 bool has_runon = ((RExC_seen & REG_SEEN_RUN_ON_COMMENT)==REG_SEEN_RUN_ON_COMMENT);
4396 U16 reganch = (U16)((r->extflags & RXf_PMf_STD_PMMOD)
4397 >> RXf_PMf_STD_PMMOD_SHIFT);
4398 const char *fptr = STD_PAT_MODS; /*"msix"*/
4400 const STRLEN wraplen = plen + has_minus + has_p + has_runon
4401 + (sizeof(STD_PAT_MODS) - 1)
4402 + (sizeof("(?:)") - 1);
4404 p = sv_grow(MUTABLE_SV(rx), wraplen + 1);
4405 SvCUR_set(rx, wraplen);
4407 SvFLAGS(rx) |= SvUTF8(pattern);
4410 *p++ = KEEPCOPY_PAT_MOD; /*'p'*/
4412 char *r = p + (sizeof(STD_PAT_MODS) - 1) + has_minus - 1;
4413 char *colon = r + 1;
4416 while((ch = *fptr++)) {
4430 Copy(RExC_precomp, p, plen, char);
4431 assert ((RX_WRAPPED(rx) - p) < 16);
4432 r->pre_prefix = p - RX_WRAPPED(rx);
4441 r->nparens = RExC_npar - 1; /* set early to validate backrefs */
4443 if (RExC_seen & REG_SEEN_RECURSE) {
4444 Newxz(RExC_open_parens, RExC_npar,regnode *);
4445 SAVEFREEPV(RExC_open_parens);
4446 Newxz(RExC_close_parens,RExC_npar,regnode *);
4447 SAVEFREEPV(RExC_close_parens);
4450 /* Useful during FAIL. */
4451 #ifdef RE_TRACK_PATTERN_OFFSETS
4452 Newxz(ri->u.offsets, 2*RExC_size+1, U32); /* MJD 20001228 */
4453 DEBUG_OFFSETS_r(PerlIO_printf(Perl_debug_log,
4454 "%s %"UVuf" bytes for offset annotations.\n",
4455 ri->u.offsets ? "Got" : "Couldn't get",
4456 (UV)((2*RExC_size+1) * sizeof(U32))));
4458 SetProgLen(ri,RExC_size);
4462 REH_CALL_COMP_BEGIN_HOOK(pRExC_state->rx);
4464 /* Second pass: emit code. */
4465 RExC_flags = pm_flags; /* don't let top level (?i) bleed */
4470 RExC_emit_start = ri->program;
4471 RExC_emit = ri->program;
4472 RExC_emit_bound = ri->program + RExC_size + 1;
4474 /* Store the count of eval-groups for security checks: */
4475 RExC_rx->seen_evals = RExC_seen_evals;
4476 REGC((U8)REG_MAGIC, (char*) RExC_emit++);
4477 if (reg(pRExC_state, 0, &flags,1) == NULL) {
4481 /* XXXX To minimize changes to RE engine we always allocate
4482 3-units-long substrs field. */
4483 Newx(r->substrs, 1, struct reg_substr_data);
4484 if (RExC_recurse_count) {
4485 Newxz(RExC_recurse,RExC_recurse_count,regnode *);
4486 SAVEFREEPV(RExC_recurse);
4490 r->minlen = minlen = sawplus = sawopen = 0;
4491 Zero(r->substrs, 1, struct reg_substr_data);
4493 #ifdef TRIE_STUDY_OPT
4495 StructCopy(&zero_scan_data, &data, scan_data_t);
4496 copyRExC_state = RExC_state;
4499 DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log,"Restudying\n"));
4501 RExC_state = copyRExC_state;
4502 if (seen & REG_TOP_LEVEL_BRANCHES)
4503 RExC_seen |= REG_TOP_LEVEL_BRANCHES;
4505 RExC_seen &= ~REG_TOP_LEVEL_BRANCHES;
4506 if (data.last_found) {
4507 SvREFCNT_dec(data.longest_fixed);
4508 SvREFCNT_dec(data.longest_float);
4509 SvREFCNT_dec(data.last_found);
4511 StructCopy(&zero_scan_data, &data, scan_data_t);
4514 StructCopy(&zero_scan_data, &data, scan_data_t);
4517 /* Dig out information for optimizations. */
4518 r->extflags = RExC_flags; /* was pm_op */
4519 /*dmq: removed as part of de-PMOP: pm->op_pmflags = RExC_flags; */
4522 SvUTF8_on(rx); /* Unicode in it? */
4523 ri->regstclass = NULL;
4524 if (RExC_naughty >= 10) /* Probably an expensive pattern. */
4525 r->intflags |= PREGf_NAUGHTY;
4526 scan = ri->program + 1; /* First BRANCH. */
4528 /* testing for BRANCH here tells us whether there is "must appear"
4529 data in the pattern. If there is then we can use it for optimisations */
4530 if (!(RExC_seen & REG_TOP_LEVEL_BRANCHES)) { /* Only one top-level choice. */
4532 STRLEN longest_float_length, longest_fixed_length;
4533 struct regnode_charclass_class ch_class; /* pointed to by data */
4535 I32 last_close = 0; /* pointed to by data */
4536 regnode *first= scan;
4537 regnode *first_next= regnext(first);
4540 * Skip introductions and multiplicators >= 1
4541 * so that we can extract the 'meat' of the pattern that must
4542 * match in the large if() sequence following.
4543 * NOTE that EXACT is NOT covered here, as it is normally
4544 * picked up by the optimiser separately.
4546 * This is unfortunate as the optimiser isnt handling lookahead
4547 * properly currently.
4550 while ((OP(first) == OPEN && (sawopen = 1)) ||
4551 /* An OR of *one* alternative - should not happen now. */
4552 (OP(first) == BRANCH && OP(first_next) != BRANCH) ||
4553 /* for now we can't handle lookbehind IFMATCH*/
4554 (OP(first) == IFMATCH && !first->flags) ||
4555 (OP(first) == PLUS) ||
4556 (OP(first) == MINMOD) ||
4557 /* An {n,m} with n>0 */
4558 (PL_regkind[OP(first)] == CURLY && ARG1(first) > 0) ||
4559 (OP(first) == NOTHING && PL_regkind[OP(first_next)] != END ))
4562 * the only op that could be a regnode is PLUS, all the rest
4563 * will be regnode_1 or regnode_2.
4566 if (OP(first) == PLUS)
4569 first += regarglen[OP(first)];
4571 first = NEXTOPER(first);
4572 first_next= regnext(first);
4575 /* Starting-point info. */
4577 DEBUG_PEEP("first:",first,0);
4578 /* Ignore EXACT as we deal with it later. */
4579 if (PL_regkind[OP(first)] == EXACT) {
4580 if (OP(first) == EXACT)
4581 NOOP; /* Empty, get anchored substr later. */
4582 else if ((OP(first) == EXACTF || OP(first) == EXACTFL))
4583 ri->regstclass = first;
4586 else if (PL_regkind[OP(first)] == TRIE &&
4587 ((reg_trie_data *)ri->data->data[ ARG(first) ])->minlen>0)
4590 /* this can happen only on restudy */
4591 if ( OP(first) == TRIE ) {
4592 struct regnode_1 *trieop = (struct regnode_1 *)
4593 PerlMemShared_calloc(1, sizeof(struct regnode_1));
4594 StructCopy(first,trieop,struct regnode_1);
4595 trie_op=(regnode *)trieop;
4597 struct regnode_charclass *trieop = (struct regnode_charclass *)
4598 PerlMemShared_calloc(1, sizeof(struct regnode_charclass));
4599 StructCopy(first,trieop,struct regnode_charclass);
4600 trie_op=(regnode *)trieop;
4603 make_trie_failtable(pRExC_state, (regnode *)first, trie_op, 0);
4604 ri->regstclass = trie_op;
4607 else if (REGNODE_SIMPLE(OP(first)))
4608 ri->regstclass = first;
4609 else if (PL_regkind[OP(first)] == BOUND ||
4610 PL_regkind[OP(first)] == NBOUND)
4611 ri->regstclass = first;
4612 else if (PL_regkind[OP(first)] == BOL) {
4613 r->extflags |= (OP(first) == MBOL
4615 : (OP(first) == SBOL
4618 first = NEXTOPER(first);
4621 else if (OP(first) == GPOS) {
4622 r->extflags |= RXf_ANCH_GPOS;
4623 first = NEXTOPER(first);
4626 else if ((!sawopen || !RExC_sawback) &&
4627 (OP(first) == STAR &&
4628 PL_regkind[OP(NEXTOPER(first))] == REG_ANY) &&
4629 !(r->extflags & RXf_ANCH) && !(RExC_seen & REG_SEEN_EVAL))
4631 /* turn .* into ^.* with an implied $*=1 */
4633 (OP(NEXTOPER(first)) == REG_ANY)
4636 r->extflags |= type;
4637 r->intflags |= PREGf_IMPLICIT;
4638 first = NEXTOPER(first);
4641 if (sawplus && (!sawopen || !RExC_sawback)
4642 && !(RExC_seen & REG_SEEN_EVAL)) /* May examine pos and $& */
4643 /* x+ must match at the 1st pos of run of x's */
4644 r->intflags |= PREGf_SKIP;
4646 /* Scan is after the zeroth branch, first is atomic matcher. */
4647 #ifdef TRIE_STUDY_OPT
4650 PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
4651 (IV)(first - scan + 1))
4655 PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
4656 (IV)(first - scan + 1))
4662 * If there's something expensive in the r.e., find the
4663 * longest literal string that must appear and make it the
4664 * regmust. Resolve ties in favor of later strings, since
4665 * the regstart check works with the beginning of the r.e.
4666 * and avoiding duplication strengthens checking. Not a
4667 * strong reason, but sufficient in the absence of others.
4668 * [Now we resolve ties in favor of the earlier string if
4669 * it happens that c_offset_min has been invalidated, since the
4670 * earlier string may buy us something the later one won't.]
4673 data.longest_fixed = newSVpvs("");
4674 data.longest_float = newSVpvs("");
4675 data.last_found = newSVpvs("");
4676 data.longest = &(data.longest_fixed);
4678 if (!ri->regstclass) {
4679 cl_init(pRExC_state, &ch_class);
4680 data.start_class = &ch_class;
4681 stclass_flag = SCF_DO_STCLASS_AND;
4682 } else /* XXXX Check for BOUND? */
4684 data.last_closep = &last_close;
4686 minlen = study_chunk(pRExC_state, &first, &minlen, &fake, scan + RExC_size, /* Up to end */
4687 &data, -1, NULL, NULL,
4688 SCF_DO_SUBSTR | SCF_WHILEM_VISITED_POS | stclass_flag,0);
4694 if ( RExC_npar == 1 && data.longest == &(data.longest_fixed)
4695 && data.last_start_min == 0 && data.last_end > 0
4696 && !RExC_seen_zerolen
4697 && !(RExC_seen & REG_SEEN_VERBARG)
4698 && (!(RExC_seen & REG_SEEN_GPOS) || (r->extflags & RXf_ANCH_GPOS)))
4699 r->extflags |= RXf_CHECK_ALL;
4700 scan_commit(pRExC_state, &data,&minlen,0);
4701 SvREFCNT_dec(data.last_found);
4703 /* Note that code very similar to this but for anchored string
4704 follows immediately below, changes may need to be made to both.
4707 longest_float_length = CHR_SVLEN(data.longest_float);
4708 if (longest_float_length
4709 || (data.flags & SF_FL_BEFORE_EOL
4710 && (!(data.flags & SF_FL_BEFORE_MEOL)
4711 || (RExC_flags & RXf_PMf_MULTILINE))))
4715 if (SvCUR(data.longest_fixed) /* ok to leave SvCUR */
4716 && data.offset_fixed == data.offset_float_min
4717 && SvCUR(data.longest_fixed) == SvCUR(data.longest_float))
4718 goto remove_float; /* As in (a)+. */
4720 /* copy the information about the longest float from the reg_scan_data
4721 over to the program. */
4722 if (SvUTF8(data.longest_float)) {
4723 r->float_utf8 = data.longest_float;
4724 r->float_substr = NULL;
4726 r->float_substr = data.longest_float;
4727 r->float_utf8 = NULL;
4729 /* float_end_shift is how many chars that must be matched that
4730 follow this item. We calculate it ahead of time as once the
4731 lookbehind offset is added in we lose the ability to correctly
4733 ml = data.minlen_float ? *(data.minlen_float)
4734 : (I32)longest_float_length;
4735 r->float_end_shift = ml - data.offset_float_min
4736 - longest_float_length + (SvTAIL(data.longest_float) != 0)
4737 + data.lookbehind_float;
4738 r->float_min_offset = data.offset_float_min - data.lookbehind_float;
4739 r->float_max_offset = data.offset_float_max;
4740 if (data.offset_float_max < I32_MAX) /* Don't offset infinity */
4741 r->float_max_offset -= data.lookbehind_float;
4743 t = (data.flags & SF_FL_BEFORE_EOL /* Can't have SEOL and MULTI */
4744 && (!(data.flags & SF_FL_BEFORE_MEOL)
4745 || (RExC_flags & RXf_PMf_MULTILINE)));
4746 fbm_compile(data.longest_float, t ? FBMcf_TAIL : 0);
4750 r->float_substr = r->float_utf8 = NULL;
4751 SvREFCNT_dec(data.longest_float);
4752 longest_float_length = 0;
4755 /* Note that code very similar to this but for floating string
4756 is immediately above, changes may need to be made to both.
4759 longest_fixed_length = CHR_SVLEN(data.longest_fixed);
4760 if (longest_fixed_length
4761 || (data.flags & SF_FIX_BEFORE_EOL /* Cannot have SEOL and MULTI */
4762 && (!(data.flags & SF_FIX_BEFORE_MEOL)
4763 || (RExC_flags & RXf_PMf_MULTILINE))))
4767 /* copy the information about the longest fixed
4768 from the reg_scan_data over to the program. */
4769 if (SvUTF8(data.longest_fixed)) {
4770 r->anchored_utf8 = data.longest_fixed;
4771 r->anchored_substr = NULL;
4773 r->anchored_substr = data.longest_fixed;
4774 r->anchored_utf8 = NULL;
4776 /* fixed_end_shift is how many chars that must be matched that
4777 follow this item. We calculate it ahead of time as once the
4778 lookbehind offset is added in we lose the ability to correctly
4780 ml = data.minlen_fixed ? *(data.minlen_fixed)
4781 : (I32)longest_fixed_length;
4782 r->anchored_end_shift = ml - data.offset_fixed
4783 - longest_fixed_length + (SvTAIL(data.longest_fixed) != 0)
4784 + data.lookbehind_fixed;
4785 r->anchored_offset = data.offset_fixed - data.lookbehind_fixed;
4787 t = (data.flags & SF_FIX_BEFORE_EOL /* Can't have SEOL and MULTI */
4788 && (!(data.flags & SF_FIX_BEFORE_MEOL)
4789 || (RExC_flags & RXf_PMf_MULTILINE)));
4790 fbm_compile(data.longest_fixed, t ? FBMcf_TAIL : 0);
4793 r->anchored_substr = r->anchored_utf8 = NULL;
4794 SvREFCNT_dec(data.longest_fixed);
4795 longest_fixed_length = 0;
4798 && (OP(ri->regstclass) == REG_ANY || OP(ri->regstclass) == SANY))
4799 ri->regstclass = NULL;
4800 if ((!(r->anchored_substr || r->anchored_utf8) || r->anchored_offset)
4802 && !(data.start_class->flags & ANYOF_EOS)
4803 && !cl_is_anything(data.start_class))
4805 const U32 n = add_data(pRExC_state, 1, "f");
4807 Newx(RExC_rxi->data->data[n], 1,
4808 struct regnode_charclass_class);
4809 StructCopy(data.start_class,
4810 (struct regnode_charclass_class*)RExC_rxi->data->data[n],
4811 struct regnode_charclass_class);
4812 ri->regstclass = (regnode*)RExC_rxi->data->data[n];
4813 r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
4814 DEBUG_COMPILE_r({ SV *sv = sv_newmortal();
4815 regprop(r, sv, (regnode*)data.start_class);
4816 PerlIO_printf(Perl_debug_log,
4817 "synthetic stclass \"%s\".\n",
4818 SvPVX_const(sv));});
4821 /* A temporary algorithm prefers floated substr to fixed one to dig more info. */
4822 if (longest_fixed_length > longest_float_length) {
4823 r->check_end_shift = r->anchored_end_shift;
4824 r->check_substr = r->anchored_substr;
4825 r->check_utf8 = r->anchored_utf8;
4826 r->check_offset_min = r->check_offset_max = r->anchored_offset;
4827 if (r->extflags & RXf_ANCH_SINGLE)
4828 r->extflags |= RXf_NOSCAN;
4831 r->check_end_shift = r->float_end_shift;
4832 r->check_substr = r->float_substr;
4833 r->check_utf8 = r->float_utf8;
4834 r->check_offset_min = r->float_min_offset;
4835 r->check_offset_max = r->float_max_offset;
4837 /* XXXX Currently intuiting is not compatible with ANCH_GPOS.
4838 This should be changed ASAP! */
4839 if ((r->check_substr || r->check_utf8) && !(r->extflags & RXf_ANCH_GPOS)) {
4840 r->extflags |= RXf_USE_INTUIT;
4841 if (SvTAIL(r->check_substr ? r->check_substr : r->check_utf8))
4842 r->extflags |= RXf_INTUIT_TAIL;
4844 /* XXX Unneeded? dmq (shouldn't as this is handled elsewhere)
4845 if ( (STRLEN)minlen < longest_float_length )
4846 minlen= longest_float_length;
4847 if ( (STRLEN)minlen < longest_fixed_length )
4848 minlen= longest_fixed_length;
4852 /* Several toplevels. Best we can is to set minlen. */
4854 struct regnode_charclass_class ch_class;
4857 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log, "\nMulti Top Level\n"));
4859 scan = ri->program + 1;
4860 cl_init(pRExC_state, &ch_class);
4861 data.start_class = &ch_class;
4862 data.last_closep = &last_close;
4865 minlen = study_chunk(pRExC_state, &scan, &minlen, &fake, scan + RExC_size,
4866 &data, -1, NULL, NULL, SCF_DO_STCLASS_AND|SCF_WHILEM_VISITED_POS,0);
4870 r->check_substr = r->check_utf8 = r->anchored_substr = r->anchored_utf8
4871 = r->float_substr = r->float_utf8 = NULL;
4872 if (!(data.start_class->flags & ANYOF_EOS)
4873 && !cl_is_anything(data.start_class))
4875 const U32 n = add_data(pRExC_state, 1, "f");
4877 Newx(RExC_rxi->data->data[n], 1,
4878 struct regnode_charclass_class);
4879 StructCopy(data.start_class,
4880 (struct regnode_charclass_class*)RExC_rxi->data->data[n],
4881 struct regnode_charclass_class);
4882 ri->regstclass = (regnode*)RExC_rxi->data->data[n];
4883 r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
4884 DEBUG_COMPILE_r({ SV* sv = sv_newmortal();
4885 regprop(r, sv, (regnode*)data.start_class);
4886 PerlIO_printf(Perl_debug_log,
4887 "synthetic stclass \"%s\".\n",
4888 SvPVX_const(sv));});
4892 /* Guard against an embedded (?=) or (?<=) with a longer minlen than
4893 the "real" pattern. */
4895 PerlIO_printf(Perl_debug_log,"minlen: %"IVdf" r->minlen:%"IVdf"\n",
4896 (IV)minlen, (IV)r->minlen);
4898 r->minlenret = minlen;
4899 if (r->minlen < minlen)
4902 if (RExC_seen & REG_SEEN_GPOS)
4903 r->extflags |= RXf_GPOS_SEEN;
4904 if (RExC_seen & REG_SEEN_LOOKBEHIND)
4905 r->extflags |= RXf_LOOKBEHIND_SEEN;
4906 if (RExC_seen & REG_SEEN_EVAL)
4907 r->extflags |= RXf_EVAL_SEEN;
4908 if (RExC_seen & REG_SEEN_CANY)
4909 r->extflags |= RXf_CANY_SEEN;
4910 if (RExC_seen & REG_SEEN_VERBARG)
4911 r->intflags |= PREGf_VERBARG_SEEN;
4912 if (RExC_seen & REG_SEEN_CUTGROUP)
4913 r->intflags |= PREGf_CUTGROUP_SEEN;
4914 if (RExC_paren_names)
4915 RXp_PAREN_NAMES(r) = MUTABLE_HV(SvREFCNT_inc(RExC_paren_names));
4917 RXp_PAREN_NAMES(r) = NULL;
4919 #ifdef STUPID_PATTERN_CHECKS
4920 if (RX_PRELEN(rx) == 0)
4921 r->extflags |= RXf_NULL;
4922 if (r->extflags & RXf_SPLIT && RX_PRELEN(rx) == 1 && RX_PRECOMP(rx)[0] == ' ')
4923 /* XXX: this should happen BEFORE we compile */
4924 r->extflags |= (RXf_SKIPWHITE|RXf_WHITE);
4925 else if (RX_PRELEN(rx) == 3 && memEQ("\\s+", RX_PRECOMP(rx), 3))
4926 r->extflags |= RXf_WHITE;
4927 else if (RX_PRELEN(rx) == 1 && RXp_PRECOMP(rx)[0] == '^')
4928 r->extflags |= RXf_START_ONLY;
4930 if (r->extflags & RXf_SPLIT && RX_PRELEN(rx) == 1 && RX_PRECOMP(rx)[0] == ' ')
4931 /* XXX: this should happen BEFORE we compile */
4932 r->extflags |= (RXf_SKIPWHITE|RXf_WHITE);
4934 regnode *first = ri->program + 1;
4936 U8 nop = OP(NEXTOPER(first));
4938 if (PL_regkind[fop] == NOTHING && nop == END)
4939 r->extflags |= RXf_NULL;
4940 else if (PL_regkind[fop] == BOL && nop == END)
4941 r->extflags |= RXf_START_ONLY;
4942 else if (fop == PLUS && nop ==SPACE && OP(regnext(first))==END)
4943 r->extflags |= RXf_WHITE;
4947 if (RExC_paren_names) {
4948 ri->name_list_idx = add_data( pRExC_state, 1, "a" );
4949 ri->data->data[ri->name_list_idx] = (void*)SvREFCNT_inc(RExC_paren_name_list);
4952 ri->name_list_idx = 0;
4954 if (RExC_recurse_count) {
4955 for ( ; RExC_recurse_count ; RExC_recurse_count-- ) {
4956 const regnode *scan = RExC_recurse[RExC_recurse_count-1];
4957 ARG2L_SET( scan, RExC_open_parens[ARG(scan)-1] - scan );
4960 Newxz(r->offs, RExC_npar, regexp_paren_pair);
4961 /* assume we don't need to swap parens around before we match */
4964 PerlIO_printf(Perl_debug_log,"Final program:\n");
4967 #ifdef RE_TRACK_PATTERN_OFFSETS
4968 DEBUG_OFFSETS_r(if (ri->u.offsets) {
4969 const U32 len = ri->u.offsets[0];
4971 GET_RE_DEBUG_FLAGS_DECL;
4972 PerlIO_printf(Perl_debug_log, "Offsets: [%"UVuf"]\n\t", (UV)ri->u.offsets[0]);
4973 for (i = 1; i <= len; i++) {
4974 if (ri->u.offsets[i*2-1] || ri->u.offsets[i*2])
4975 PerlIO_printf(Perl_debug_log, "%"UVuf":%"UVuf"[%"UVuf"] ",
4976 (UV)i, (UV)ri->u.offsets[i*2-1], (UV)ri->u.offsets[i*2]);
4978 PerlIO_printf(Perl_debug_log, "\n");
4984 #undef RE_ENGINE_PTR
4988 Perl_reg_named_buff(pTHX_ REGEXP * const rx, SV * const key, SV * const value,
4991 PERL_ARGS_ASSERT_REG_NAMED_BUFF;
4993 PERL_UNUSED_ARG(value);
4995 if (flags & RXapif_FETCH) {
4996 return reg_named_buff_fetch(rx, key, flags);
4997 } else if (flags & (RXapif_STORE | RXapif_DELETE | RXapif_CLEAR)) {
4998 Perl_croak_no_modify(aTHX);
5000 } else if (flags & RXapif_EXISTS) {
5001 return reg_named_buff_exists(rx, key, flags)
5004 } else if (flags & RXapif_REGNAMES) {
5005 return reg_named_buff_all(rx, flags);
5006 } else if (flags & (RXapif_SCALAR | RXapif_REGNAMES_COUNT)) {
5007 return reg_named_buff_scalar(rx, flags);
5009 Perl_croak(aTHX_ "panic: Unknown flags %d in named_buff", (int)flags);
5015 Perl_reg_named_buff_iter(pTHX_ REGEXP * const rx, const SV * const lastkey,
5018 PERL_ARGS_ASSERT_REG_NAMED_BUFF_ITER;
5019 PERL_UNUSED_ARG(lastkey);
5021 if (flags & RXapif_FIRSTKEY)
5022 return reg_named_buff_firstkey(rx, flags);
5023 else if (flags & RXapif_NEXTKEY)
5024 return reg_named_buff_nextkey(rx, flags);
5026 Perl_croak(aTHX_ "panic: Unknown flags %d in named_buff_iter", (int)flags);
5032 Perl_reg_named_buff_fetch(pTHX_ REGEXP * const r, SV * const namesv,
5035 AV *retarray = NULL;
5037 struct regexp *const rx = (struct regexp *)SvANY(r);
5039 PERL_ARGS_ASSERT_REG_NAMED_BUFF_FETCH;
5041 if (flags & RXapif_ALL)
5044 if (rx && RXp_PAREN_NAMES(rx)) {
5045 HE *he_str = hv_fetch_ent( RXp_PAREN_NAMES(rx), namesv, 0, 0 );
5048 SV* sv_dat=HeVAL(he_str);
5049 I32 *nums=(I32*)SvPVX(sv_dat);
5050 for ( i=0; i<SvIVX(sv_dat); i++ ) {
5051 if ((I32)(rx->nparens) >= nums[i]
5052 && rx->offs[nums[i]].start != -1
5053 && rx->offs[nums[i]].end != -1)
5056 CALLREG_NUMBUF_FETCH(r,nums[i],ret);
5060 ret = newSVsv(&PL_sv_undef);
5063 av_push(retarray, ret);
5066 return newRV_noinc(MUTABLE_SV(retarray));
5073 Perl_reg_named_buff_exists(pTHX_ REGEXP * const r, SV * const key,
5076 struct regexp *const rx = (struct regexp *)SvANY(r);
5078 PERL_ARGS_ASSERT_REG_NAMED_BUFF_EXISTS;
5080 if (rx && RXp_PAREN_NAMES(rx)) {
5081 if (flags & RXapif_ALL) {
5082 return hv_exists_ent(RXp_PAREN_NAMES(rx), key, 0);
5084 SV *sv = CALLREG_NAMED_BUFF_FETCH(r, key, flags);
5098 Perl_reg_named_buff_firstkey(pTHX_ REGEXP * const r, const U32 flags)
5100 struct regexp *const rx = (struct regexp *)SvANY(r);
5102 PERL_ARGS_ASSERT_REG_NAMED_BUFF_FIRSTKEY;
5104 if ( rx && RXp_PAREN_NAMES(rx) ) {
5105 (void)hv_iterinit(RXp_PAREN_NAMES(rx));
5107 return CALLREG_NAMED_BUFF_NEXTKEY(r, NULL, flags & ~RXapif_FIRSTKEY);
5114 Perl_reg_named_buff_nextkey(pTHX_ REGEXP * const r, const U32 flags)
5116 struct regexp *const rx = (struct regexp *)SvANY(r);
5117 GET_RE_DEBUG_FLAGS_DECL;
5119 PERL_ARGS_ASSERT_REG_NAMED_BUFF_NEXTKEY;
5121 if (rx && RXp_PAREN_NAMES(rx)) {
5122 HV *hv = RXp_PAREN_NAMES(rx);
5124 while ( (temphe = hv_iternext_flags(hv,0)) ) {
5127 SV* sv_dat = HeVAL(temphe);
5128 I32 *nums = (I32*)SvPVX(sv_dat);
5129 for ( i = 0; i < SvIVX(sv_dat); i++ ) {
5130 if ((I32)(rx->lastparen) >= nums[i] &&
5131 rx->offs[nums[i]].start != -1 &&
5132 rx->offs[nums[i]].end != -1)
5138 if (parno || flags & RXapif_ALL) {
5139 return newSVhek(HeKEY_hek(temphe));
5147 Perl_reg_named_buff_scalar(pTHX_ REGEXP * const r, const U32 flags)
5152 struct regexp *const rx = (struct regexp *)SvANY(r);
5154 PERL_ARGS_ASSERT_REG_NAMED_BUFF_SCALAR;
5156 if (rx && RXp_PAREN_NAMES(rx)) {
5157 if (flags & (RXapif_ALL | RXapif_REGNAMES_COUNT)) {
5158 return newSViv(HvTOTALKEYS(RXp_PAREN_NAMES(rx)));
5159 } else if (flags & RXapif_ONE) {
5160 ret = CALLREG_NAMED_BUFF_ALL(r, (flags | RXapif_REGNAMES));
5161 av = MUTABLE_AV(SvRV(ret));
5162 length = av_len(av);
5164 return newSViv(length + 1);
5166 Perl_croak(aTHX_ "panic: Unknown flags %d in named_buff_scalar", (int)flags);
5170 return &PL_sv_undef;
5174 Perl_reg_named_buff_all(pTHX_ REGEXP * const r, const U32 flags)
5176 struct regexp *const rx = (struct regexp *)SvANY(r);
5179 PERL_ARGS_ASSERT_REG_NAMED_BUFF_ALL;
5181 if (rx && RXp_PAREN_NAMES(rx)) {
5182 HV *hv= RXp_PAREN_NAMES(rx);
5184 (void)hv_iterinit(hv);
5185 while ( (temphe = hv_iternext_flags(hv,0)) ) {
5188 SV* sv_dat = HeVAL(temphe);
5189 I32 *nums = (I32*)SvPVX(sv_dat);
5190 for ( i = 0; i < SvIVX(sv_dat); i++ ) {
5191 if ((I32)(rx->lastparen) >= nums[i] &&
5192 rx->offs[nums[i]].start != -1 &&
5193 rx->offs[nums[i]].end != -1)
5199 if (parno || flags & RXapif_ALL) {
5200 av_push(av, newSVhek(HeKEY_hek(temphe)));
5205 return newRV_noinc(MUTABLE_SV(av));
5209 Perl_reg_numbered_buff_fetch(pTHX_ REGEXP * const r, const I32 paren,
5212 struct regexp *const rx = (struct regexp *)SvANY(r);
5217 PERL_ARGS_ASSERT_REG_NUMBERED_BUFF_FETCH;
5220 sv_setsv(sv,&PL_sv_undef);
5224 if (paren == RX_BUFF_IDX_PREMATCH && rx->offs[0].start != -1) {
5226 i = rx->offs[0].start;
5230 if (paren == RX_BUFF_IDX_POSTMATCH && rx->offs[0].end != -1) {
5232 s = rx->subbeg + rx->offs[0].end;
5233 i = rx->sublen - rx->offs[0].end;
5236 if ( 0 <= paren && paren <= (I32)rx->nparens &&
5237 (s1 = rx->offs[paren].start) != -1 &&
5238 (t1 = rx->offs[paren].end) != -1)
5242 s = rx->subbeg + s1;
5244 sv_setsv(sv,&PL_sv_undef);
5247 assert(rx->sublen >= (s - rx->subbeg) + i );
5249 const int oldtainted = PL_tainted;
5251 sv_setpvn(sv, s, i);
5252 PL_tainted = oldtainted;
5253 if ( (rx->extflags & RXf_CANY_SEEN)
5254 ? (RXp_MATCH_UTF8(rx)
5255 && (!i || is_utf8_string((U8*)s, i)))
5256 : (RXp_MATCH_UTF8(rx)) )
5263 if (RXp_MATCH_TAINTED(rx)) {
5264 if (SvTYPE(sv) >= SVt_PVMG) {
5265 MAGIC* const mg = SvMAGIC(sv);
5268 SvMAGIC_set(sv, mg->mg_moremagic);
5270 if ((mgt = SvMAGIC(sv))) {
5271 mg->mg_moremagic = mgt;
5272 SvMAGIC_set(sv, mg);
5282 sv_setsv(sv,&PL_sv_undef);
5288 Perl_reg_numbered_buff_store(pTHX_ REGEXP * const rx, const I32 paren,
5289 SV const * const value)
5291 PERL_ARGS_ASSERT_REG_NUMBERED_BUFF_STORE;
5293 PERL_UNUSED_ARG(rx);
5294 PERL_UNUSED_ARG(paren);
5295 PERL_UNUSED_ARG(value);
5298 Perl_croak_no_modify(aTHX);
5302 Perl_reg_numbered_buff_length(pTHX_ REGEXP * const r, const SV * const sv,
5305 struct regexp *const rx = (struct regexp *)SvANY(r);
5309 PERL_ARGS_ASSERT_REG_NUMBERED_BUFF_LENGTH;
5311 /* Some of this code was originally in C<Perl_magic_len> in F<mg.c> */
5313 /* $` / ${^PREMATCH} */
5314 case RX_BUFF_IDX_PREMATCH:
5315 if (rx->offs[0].start != -1) {
5316 i = rx->offs[0].start;
5324 /* $' / ${^POSTMATCH} */
5325 case RX_BUFF_IDX_POSTMATCH:
5326 if (rx->offs[0].end != -1) {
5327 i = rx->sublen - rx->offs[0].end;
5329 s1 = rx->offs[0].end;
5335 /* $& / ${^MATCH}, $1, $2, ... */
5337 if (paren <= (I32)rx->nparens &&
5338 (s1 = rx->offs[paren].start) != -1 &&
5339 (t1 = rx->offs[paren].end) != -1)
5344 if (ckWARN(WARN_UNINITIALIZED))
5345 report_uninit((const SV *)sv);
5350 if (i > 0 && RXp_MATCH_UTF8(rx)) {
5351 const char * const s = rx->subbeg + s1;
5356 if (is_utf8_string_loclen((U8*)s, i, &ep, &el))
5363 Perl_reg_qr_package(pTHX_ REGEXP * const rx)
5365 PERL_ARGS_ASSERT_REG_QR_PACKAGE;
5366 PERL_UNUSED_ARG(rx);
5370 return newSVpvs("Regexp");
5373 /* Scans the name of a named buffer from the pattern.
5374 * If flags is REG_RSN_RETURN_NULL returns null.
5375 * If flags is REG_RSN_RETURN_NAME returns an SV* containing the name
5376 * If flags is REG_RSN_RETURN_DATA returns the data SV* corresponding
5377 * to the parsed name as looked up in the RExC_paren_names hash.
5378 * If there is an error throws a vFAIL().. type exception.
5381 #define REG_RSN_RETURN_NULL 0
5382 #define REG_RSN_RETURN_NAME 1
5383 #define REG_RSN_RETURN_DATA 2
5386 S_reg_scan_name(pTHX_ RExC_state_t *pRExC_state, U32 flags)
5388 char *name_start = RExC_parse;
5390 PERL_ARGS_ASSERT_REG_SCAN_NAME;
5392 if (isIDFIRST_lazy_if(RExC_parse, UTF)) {
5393 /* skip IDFIRST by using do...while */
5396 RExC_parse += UTF8SKIP(RExC_parse);
5397 } while (isALNUM_utf8((U8*)RExC_parse));
5401 } while (isALNUM(*RExC_parse));
5406 = newSVpvn_flags(name_start, (int)(RExC_parse - name_start),
5407 SVs_TEMP | (UTF ? SVf_UTF8 : 0));
5408 if ( flags == REG_RSN_RETURN_NAME)
5410 else if (flags==REG_RSN_RETURN_DATA) {
5413 if ( ! sv_name ) /* should not happen*/
5414 Perl_croak(aTHX_ "panic: no svname in reg_scan_name");
5415 if (RExC_paren_names)
5416 he_str = hv_fetch_ent( RExC_paren_names, sv_name, 0, 0 );
5418 sv_dat = HeVAL(he_str);
5420 vFAIL("Reference to nonexistent named group");
5424 Perl_croak(aTHX_ "panic: bad flag in reg_scan_name");
5431 #define DEBUG_PARSE_MSG(funcname) DEBUG_PARSE_r({ \
5432 int rem=(int)(RExC_end - RExC_parse); \
5441 if (RExC_lastparse!=RExC_parse) \
5442 PerlIO_printf(Perl_debug_log," >%.*s%-*s", \
5445 iscut ? "..." : "<" \
5448 PerlIO_printf(Perl_debug_log,"%16s",""); \
5451 num = RExC_size + 1; \
5453 num=REG_NODE_NUM(RExC_emit); \
5454 if (RExC_lastnum!=num) \
5455 PerlIO_printf(Perl_debug_log,"|%4d",num); \
5457 PerlIO_printf(Perl_debug_log,"|%4s",""); \
5458 PerlIO_printf(Perl_debug_log,"|%*s%-4s", \
5459 (int)((depth*2)), "", \
5463 RExC_lastparse=RExC_parse; \
5468 #define DEBUG_PARSE(funcname) DEBUG_PARSE_r({ \
5469 DEBUG_PARSE_MSG((funcname)); \
5470 PerlIO_printf(Perl_debug_log,"%4s","\n"); \
5472 #define DEBUG_PARSE_FMT(funcname,fmt,args) DEBUG_PARSE_r({ \
5473 DEBUG_PARSE_MSG((funcname)); \
5474 PerlIO_printf(Perl_debug_log,fmt "\n",args); \
5477 - reg - regular expression, i.e. main body or parenthesized thing
5479 * Caller must absorb opening parenthesis.
5481 * Combining parenthesis handling with the base level of regular expression
5482 * is a trifle forced, but the need to tie the tails of the branches to what
5483 * follows makes it hard to avoid.
5485 #define REGTAIL(x,y,z) regtail((x),(y),(z),depth+1)
5487 #define REGTAIL_STUDY(x,y,z) regtail_study((x),(y),(z),depth+1)
5489 #define REGTAIL_STUDY(x,y,z) regtail((x),(y),(z),depth+1)
5493 S_reg(pTHX_ RExC_state_t *pRExC_state, I32 paren, I32 *flagp,U32 depth)
5494 /* paren: Parenthesized? 0=top, 1=(, inside: changed to letter. */
5497 register regnode *ret; /* Will be the head of the group. */
5498 register regnode *br;
5499 register regnode *lastbr;
5500 register regnode *ender = NULL;
5501 register I32 parno = 0;
5503 U32 oregflags = RExC_flags;
5504 bool have_branch = 0;
5506 I32 freeze_paren = 0;
5507 I32 after_freeze = 0;
5509 /* for (?g), (?gc), and (?o) warnings; warning
5510 about (?c) will warn about (?g) -- japhy */
5512 #define WASTED_O 0x01
5513 #define WASTED_G 0x02
5514 #define WASTED_C 0x04
5515 #define WASTED_GC (0x02|0x04)
5516 I32 wastedflags = 0x00;
5518 char * parse_start = RExC_parse; /* MJD */
5519 char * const oregcomp_parse = RExC_parse;
5521 GET_RE_DEBUG_FLAGS_DECL;
5523 PERL_ARGS_ASSERT_REG;
5524 DEBUG_PARSE("reg ");
5526 *flagp = 0; /* Tentatively. */
5529 /* Make an OPEN node, if parenthesized. */
5531 if ( *RExC_parse == '*') { /* (*VERB:ARG) */
5532 char *start_verb = RExC_parse;
5533 STRLEN verb_len = 0;
5534 char *start_arg = NULL;
5535 unsigned char op = 0;
5537 int internal_argval = 0; /* internal_argval is only useful if !argok */
5538 while ( *RExC_parse && *RExC_parse != ')' ) {
5539 if ( *RExC_parse == ':' ) {
5540 start_arg = RExC_parse + 1;
5546 verb_len = RExC_parse - start_verb;
5549 while ( *RExC_parse && *RExC_parse != ')' )
5551 if ( *RExC_parse != ')' )
5552 vFAIL("Unterminated verb pattern argument");
5553 if ( RExC_parse == start_arg )
5556 if ( *RExC_parse != ')' )
5557 vFAIL("Unterminated verb pattern");
5560 switch ( *start_verb ) {
5561 case 'A': /* (*ACCEPT) */
5562 if ( memEQs(start_verb,verb_len,"ACCEPT") ) {
5564 internal_argval = RExC_nestroot;
5567 case 'C': /* (*COMMIT) */
5568 if ( memEQs(start_verb,verb_len,"COMMIT") )
5571 case 'F': /* (*FAIL) */
5572 if ( verb_len==1 || memEQs(start_verb,verb_len,"FAIL") ) {
5577 case ':': /* (*:NAME) */
5578 case 'M': /* (*MARK:NAME) */
5579 if ( verb_len==0 || memEQs(start_verb,verb_len,"MARK") ) {
5584 case 'P': /* (*PRUNE) */
5585 if ( memEQs(start_verb,verb_len,"PRUNE") )
5588 case 'S': /* (*SKIP) */
5589 if ( memEQs(start_verb,verb_len,"SKIP") )
5592 case 'T': /* (*THEN) */
5593 /* [19:06] <TimToady> :: is then */
5594 if ( memEQs(start_verb,verb_len,"THEN") ) {
5596 RExC_seen |= REG_SEEN_CUTGROUP;
5602 vFAIL3("Unknown verb pattern '%.*s'",
5603 verb_len, start_verb);
5606 if ( start_arg && internal_argval ) {
5607 vFAIL3("Verb pattern '%.*s' may not have an argument",
5608 verb_len, start_verb);
5609 } else if ( argok < 0 && !start_arg ) {
5610 vFAIL3("Verb pattern '%.*s' has a mandatory argument",
5611 verb_len, start_verb);
5613 ret = reganode(pRExC_state, op, internal_argval);
5614 if ( ! internal_argval && ! SIZE_ONLY ) {
5616 SV *sv = newSVpvn( start_arg, RExC_parse - start_arg);
5617 ARG(ret) = add_data( pRExC_state, 1, "S" );
5618 RExC_rxi->data->data[ARG(ret)]=(void*)sv;
5625 if (!internal_argval)
5626 RExC_seen |= REG_SEEN_VERBARG;
5627 } else if ( start_arg ) {
5628 vFAIL3("Verb pattern '%.*s' may not have an argument",
5629 verb_len, start_verb);
5631 ret = reg_node(pRExC_state, op);
5633 nextchar(pRExC_state);
5636 if (*RExC_parse == '?') { /* (?...) */
5637 bool is_logical = 0;
5638 const char * const seqstart = RExC_parse;
5641 paren = *RExC_parse++;
5642 ret = NULL; /* For look-ahead/behind. */
5645 case 'P': /* (?P...) variants for those used to PCRE/Python */
5646 paren = *RExC_parse++;
5647 if ( paren == '<') /* (?P<...>) named capture */
5649 else if (paren == '>') { /* (?P>name) named recursion */
5650 goto named_recursion;
5652 else if (paren == '=') { /* (?P=...) named backref */
5653 /* this pretty much dupes the code for \k<NAME> in regatom(), if
5654 you change this make sure you change that */
5655 char* name_start = RExC_parse;
5657 SV *sv_dat = reg_scan_name(pRExC_state,
5658 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5659 if (RExC_parse == name_start || *RExC_parse != ')')
5660 vFAIL2("Sequence %.3s... not terminated",parse_start);
5663 num = add_data( pRExC_state, 1, "S" );
5664 RExC_rxi->data->data[num]=(void*)sv_dat;
5665 SvREFCNT_inc_simple_void(sv_dat);
5668 ret = reganode(pRExC_state,
5669 (U8)(FOLD ? (LOC ? NREFFL : NREFF) : NREF),
5673 Set_Node_Offset(ret, parse_start+1);
5674 Set_Node_Cur_Length(ret); /* MJD */
5676 nextchar(pRExC_state);
5680 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5682 case '<': /* (?<...) */
5683 if (*RExC_parse == '!')
5685 else if (*RExC_parse != '=')
5691 case '\'': /* (?'...') */
5692 name_start= RExC_parse;
5693 svname = reg_scan_name(pRExC_state,
5694 SIZE_ONLY ? /* reverse test from the others */
5695 REG_RSN_RETURN_NAME :
5696 REG_RSN_RETURN_NULL);
5697 if (RExC_parse == name_start) {
5699 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5702 if (*RExC_parse != paren)
5703 vFAIL2("Sequence (?%c... not terminated",
5704 paren=='>' ? '<' : paren);
5708 if (!svname) /* shouldnt happen */
5710 "panic: reg_scan_name returned NULL");
5711 if (!RExC_paren_names) {
5712 RExC_paren_names= newHV();
5713 sv_2mortal(MUTABLE_SV(RExC_paren_names));
5715 RExC_paren_name_list= newAV();
5716 sv_2mortal(MUTABLE_SV(RExC_paren_name_list));
5719 he_str = hv_fetch_ent( RExC_paren_names, svname, 1, 0 );
5721 sv_dat = HeVAL(he_str);
5723 /* croak baby croak */
5725 "panic: paren_name hash element allocation failed");
5726 } else if ( SvPOK(sv_dat) ) {
5727 /* (?|...) can mean we have dupes so scan to check
5728 its already been stored. Maybe a flag indicating
5729 we are inside such a construct would be useful,
5730 but the arrays are likely to be quite small, so
5731 for now we punt -- dmq */
5732 IV count = SvIV(sv_dat);
5733 I32 *pv = (I32*)SvPVX(sv_dat);
5735 for ( i = 0 ; i < count ; i++ ) {
5736 if ( pv[i] == RExC_npar ) {
5742 pv = (I32*)SvGROW(sv_dat, SvCUR(sv_dat) + sizeof(I32)+1);
5743 SvCUR_set(sv_dat, SvCUR(sv_dat) + sizeof(I32));
5744 pv[count] = RExC_npar;
5745 SvIV_set(sv_dat, SvIVX(sv_dat) + 1);
5748 (void)SvUPGRADE(sv_dat,SVt_PVNV);
5749 sv_setpvn(sv_dat, (char *)&(RExC_npar), sizeof(I32));
5751 SvIV_set(sv_dat, 1);
5754 if (!av_store(RExC_paren_name_list, RExC_npar, SvREFCNT_inc(svname)))
5755 SvREFCNT_dec(svname);
5758 /*sv_dump(sv_dat);*/
5760 nextchar(pRExC_state);
5762 goto capturing_parens;
5764 RExC_seen |= REG_SEEN_LOOKBEHIND;
5766 case '=': /* (?=...) */
5767 RExC_seen_zerolen++;
5769 case '!': /* (?!...) */
5770 RExC_seen_zerolen++;
5771 if (*RExC_parse == ')') {
5772 ret=reg_node(pRExC_state, OPFAIL);
5773 nextchar(pRExC_state);
5777 case '|': /* (?|...) */
5778 /* branch reset, behave like a (?:...) except that
5779 buffers in alternations share the same numbers */
5781 after_freeze = freeze_paren = RExC_npar;
5783 case ':': /* (?:...) */
5784 case '>': /* (?>...) */
5786 case '$': /* (?$...) */
5787 case '@': /* (?@...) */
5788 vFAIL2("Sequence (?%c...) not implemented", (int)paren);
5790 case '#': /* (?#...) */
5791 while (*RExC_parse && *RExC_parse != ')')
5793 if (*RExC_parse != ')')
5794 FAIL("Sequence (?#... not terminated");
5795 nextchar(pRExC_state);
5798 case '0' : /* (?0) */
5799 case 'R' : /* (?R) */
5800 if (*RExC_parse != ')')
5801 FAIL("Sequence (?R) not terminated");
5802 ret = reg_node(pRExC_state, GOSTART);
5803 *flagp |= POSTPONED;
5804 nextchar(pRExC_state);
5807 { /* named and numeric backreferences */
5809 case '&': /* (?&NAME) */
5810 parse_start = RExC_parse - 1;
5813 SV *sv_dat = reg_scan_name(pRExC_state,
5814 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5815 num = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
5817 goto gen_recurse_regop;
5820 if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
5822 vFAIL("Illegal pattern");
5824 goto parse_recursion;
5826 case '-': /* (?-1) */
5827 if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
5828 RExC_parse--; /* rewind to let it be handled later */
5832 case '1': case '2': case '3': case '4': /* (?1) */
5833 case '5': case '6': case '7': case '8': case '9':
5836 num = atoi(RExC_parse);
5837 parse_start = RExC_parse - 1; /* MJD */
5838 if (*RExC_parse == '-')
5840 while (isDIGIT(*RExC_parse))
5842 if (*RExC_parse!=')')
5843 vFAIL("Expecting close bracket");
5846 if ( paren == '-' ) {
5848 Diagram of capture buffer numbering.
5849 Top line is the normal capture buffer numbers
5850 Botton line is the negative indexing as from
5854 /(a(x)y)(a(b(c(?-2)d)e)f)(g(h))/
5858 num = RExC_npar + num;
5861 vFAIL("Reference to nonexistent group");
5863 } else if ( paren == '+' ) {
5864 num = RExC_npar + num - 1;
5867 ret = reganode(pRExC_state, GOSUB, num);
5869 if (num > (I32)RExC_rx->nparens) {
5871 vFAIL("Reference to nonexistent group");
5873 ARG2L_SET( ret, RExC_recurse_count++);
5875 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
5876 "Recurse #%"UVuf" to %"IVdf"\n", (UV)ARG(ret), (IV)ARG2L(ret)));
5880 RExC_seen |= REG_SEEN_RECURSE;
5881 Set_Node_Length(ret, 1 + regarglen[OP(ret)]); /* MJD */
5882 Set_Node_Offset(ret, parse_start); /* MJD */
5884 *flagp |= POSTPONED;
5885 nextchar(pRExC_state);
5887 } /* named and numeric backreferences */
5890 case '?': /* (??...) */
5892 if (*RExC_parse != '{') {
5894 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5897 *flagp |= POSTPONED;
5898 paren = *RExC_parse++;
5900 case '{': /* (?{...}) */
5905 char *s = RExC_parse;
5907 RExC_seen_zerolen++;
5908 RExC_seen |= REG_SEEN_EVAL;
5909 while (count && (c = *RExC_parse)) {
5920 if (*RExC_parse != ')') {
5922 vFAIL("Sequence (?{...}) not terminated or not {}-balanced");
5926 OP_4tree *sop, *rop;
5927 SV * const sv = newSVpvn(s, RExC_parse - 1 - s);
5930 Perl_save_re_context(aTHX);
5931 rop = sv_compile_2op(sv, &sop, "re", &pad);
5932 sop->op_private |= OPpREFCOUNTED;
5933 /* re_dup will OpREFCNT_inc */
5934 OpREFCNT_set(sop, 1);
5937 n = add_data(pRExC_state, 3, "nop");
5938 RExC_rxi->data->data[n] = (void*)rop;
5939 RExC_rxi->data->data[n+1] = (void*)sop;
5940 RExC_rxi->data->data[n+2] = (void*)pad;
5943 else { /* First pass */
5944 if (PL_reginterp_cnt < ++RExC_seen_evals
5946 /* No compiled RE interpolated, has runtime
5947 components ===> unsafe. */
5948 FAIL("Eval-group not allowed at runtime, use re 'eval'");
5949 if (PL_tainting && PL_tainted)
5950 FAIL("Eval-group in insecure regular expression");
5951 #if PERL_VERSION > 8
5952 if (IN_PERL_COMPILETIME)
5957 nextchar(pRExC_state);
5959 ret = reg_node(pRExC_state, LOGICAL);
5962 REGTAIL(pRExC_state, ret, reganode(pRExC_state, EVAL, n));
5963 /* deal with the length of this later - MJD */
5966 ret = reganode(pRExC_state, EVAL, n);
5967 Set_Node_Length(ret, RExC_parse - parse_start + 1);
5968 Set_Node_Offset(ret, parse_start);
5971 case '(': /* (?(?{...})...) and (?(?=...)...) */
5974 if (RExC_parse[0] == '?') { /* (?(?...)) */
5975 if (RExC_parse[1] == '=' || RExC_parse[1] == '!'
5976 || RExC_parse[1] == '<'
5977 || RExC_parse[1] == '{') { /* Lookahead or eval. */
5980 ret = reg_node(pRExC_state, LOGICAL);
5983 REGTAIL(pRExC_state, ret, reg(pRExC_state, 1, &flag,depth+1));
5987 else if ( RExC_parse[0] == '<' /* (?(<NAME>)...) */
5988 || RExC_parse[0] == '\'' ) /* (?('NAME')...) */
5990 char ch = RExC_parse[0] == '<' ? '>' : '\'';
5991 char *name_start= RExC_parse++;
5993 SV *sv_dat=reg_scan_name(pRExC_state,
5994 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5995 if (RExC_parse == name_start || *RExC_parse != ch)
5996 vFAIL2("Sequence (?(%c... not terminated",
5997 (ch == '>' ? '<' : ch));
6000 num = add_data( pRExC_state, 1, "S" );
6001 RExC_rxi->data->data[num]=(void*)sv_dat;
6002 SvREFCNT_inc_simple_void(sv_dat);
6004 ret = reganode(pRExC_state,NGROUPP,num);
6005 goto insert_if_check_paren;
6007 else if (RExC_parse[0] == 'D' &&
6008 RExC_parse[1] == 'E' &&
6009 RExC_parse[2] == 'F' &&
6010 RExC_parse[3] == 'I' &&
6011 RExC_parse[4] == 'N' &&
6012 RExC_parse[5] == 'E')
6014 ret = reganode(pRExC_state,DEFINEP,0);
6017 goto insert_if_check_paren;
6019 else if (RExC_parse[0] == 'R') {
6022 if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
6023 parno = atoi(RExC_parse++);
6024 while (isDIGIT(*RExC_parse))
6026 } else if (RExC_parse[0] == '&') {
6029 sv_dat = reg_scan_name(pRExC_state,
6030 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
6031 parno = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
6033 ret = reganode(pRExC_state,INSUBP,parno);
6034 goto insert_if_check_paren;
6036 else if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
6039 parno = atoi(RExC_parse++);
6041 while (isDIGIT(*RExC_parse))
6043 ret = reganode(pRExC_state, GROUPP, parno);
6045 insert_if_check_paren:
6046 if ((c = *nextchar(pRExC_state)) != ')')
6047 vFAIL("Switch condition not recognized");
6049 REGTAIL(pRExC_state, ret, reganode(pRExC_state, IFTHEN, 0));
6050 br = regbranch(pRExC_state, &flags, 1,depth+1);
6052 br = reganode(pRExC_state, LONGJMP, 0);
6054 REGTAIL(pRExC_state, br, reganode(pRExC_state, LONGJMP, 0));
6055 c = *nextchar(pRExC_state);
6060 vFAIL("(?(DEFINE)....) does not allow branches");
6061 lastbr = reganode(pRExC_state, IFTHEN, 0); /* Fake one for optimizer. */
6062 regbranch(pRExC_state, &flags, 1,depth+1);
6063 REGTAIL(pRExC_state, ret, lastbr);
6066 c = *nextchar(pRExC_state);
6071 vFAIL("Switch (?(condition)... contains too many branches");
6072 ender = reg_node(pRExC_state, TAIL);
6073 REGTAIL(pRExC_state, br, ender);
6075 REGTAIL(pRExC_state, lastbr, ender);
6076 REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender);
6079 REGTAIL(pRExC_state, ret, ender);
6080 RExC_size++; /* XXX WHY do we need this?!!
6081 For large programs it seems to be required
6082 but I can't figure out why. -- dmq*/
6086 vFAIL2("Unknown switch condition (?(%.2s", RExC_parse);
6090 RExC_parse--; /* for vFAIL to print correctly */
6091 vFAIL("Sequence (? incomplete");
6095 parse_flags: /* (?i) */
6097 U32 posflags = 0, negflags = 0;
6098 U32 *flagsp = &posflags;
6100 while (*RExC_parse) {
6101 /* && strchr("iogcmsx", *RExC_parse) */
6102 /* (?g), (?gc) and (?o) are useless here
6103 and must be globally applied -- japhy */
6104 switch (*RExC_parse) {
6105 CASE_STD_PMMOD_FLAGS_PARSE_SET(flagsp);
6106 case ONCE_PAT_MOD: /* 'o' */
6107 case GLOBAL_PAT_MOD: /* 'g' */
6108 if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6109 const I32 wflagbit = *RExC_parse == 'o' ? WASTED_O : WASTED_G;
6110 if (! (wastedflags & wflagbit) ) {
6111 wastedflags |= wflagbit;
6114 "Useless (%s%c) - %suse /%c modifier",
6115 flagsp == &negflags ? "?-" : "?",
6117 flagsp == &negflags ? "don't " : "",
6124 case CONTINUE_PAT_MOD: /* 'c' */
6125 if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6126 if (! (wastedflags & WASTED_C) ) {
6127 wastedflags |= WASTED_GC;
6130 "Useless (%sc) - %suse /gc modifier",
6131 flagsp == &negflags ? "?-" : "?",
6132 flagsp == &negflags ? "don't " : ""
6137 case KEEPCOPY_PAT_MOD: /* 'p' */
6138 if (flagsp == &negflags) {
6140 ckWARNreg(RExC_parse + 1,"Useless use of (?-p)");
6142 *flagsp |= RXf_PMf_KEEPCOPY;
6146 if (flagsp == &negflags) {
6148 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
6152 wastedflags = 0; /* reset so (?g-c) warns twice */
6158 RExC_flags |= posflags;
6159 RExC_flags &= ~negflags;
6161 oregflags |= posflags;
6162 oregflags &= ~negflags;
6164 nextchar(pRExC_state);
6175 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
6180 }} /* one for the default block, one for the switch */
6187 ret = reganode(pRExC_state, OPEN, parno);
6190 RExC_nestroot = parno;
6191 if (RExC_seen & REG_SEEN_RECURSE
6192 && !RExC_open_parens[parno-1])
6194 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
6195 "Setting open paren #%"IVdf" to %d\n",
6196 (IV)parno, REG_NODE_NUM(ret)));
6197 RExC_open_parens[parno-1]= ret;
6200 Set_Node_Length(ret, 1); /* MJD */
6201 Set_Node_Offset(ret, RExC_parse); /* MJD */
6209 /* Pick up the branches, linking them together. */
6210 parse_start = RExC_parse; /* MJD */
6211 br = regbranch(pRExC_state, &flags, 1,depth+1);
6214 if (RExC_npar > after_freeze)
6215 after_freeze = RExC_npar;
6216 RExC_npar = freeze_paren;
6219 /* branch_len = (paren != 0); */
6223 if (*RExC_parse == '|') {
6224 if (!SIZE_ONLY && RExC_extralen) {
6225 reginsert(pRExC_state, BRANCHJ, br, depth+1);
6228 reginsert(pRExC_state, BRANCH, br, depth+1);
6229 Set_Node_Length(br, paren != 0);
6230 Set_Node_Offset_To_R(br-RExC_emit_start, parse_start-RExC_start);
6234 RExC_extralen += 1; /* For BRANCHJ-BRANCH. */
6236 else if (paren == ':') {
6237 *flagp |= flags&SIMPLE;
6239 if (is_open) { /* Starts with OPEN. */
6240 REGTAIL(pRExC_state, ret, br); /* OPEN -> first. */
6242 else if (paren != '?') /* Not Conditional */
6244 *flagp |= flags & (SPSTART | HASWIDTH | POSTPONED);
6246 while (*RExC_parse == '|') {
6247 if (!SIZE_ONLY && RExC_extralen) {
6248 ender = reganode(pRExC_state, LONGJMP,0);
6249 REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender); /* Append to the previous. */
6252 RExC_extralen += 2; /* Account for LONGJMP. */
6253 nextchar(pRExC_state);
6255 if (RExC_npar > after_freeze)
6256 after_freeze = RExC_npar;
6257 RExC_npar = freeze_paren;
6259 br = regbranch(pRExC_state, &flags, 0, depth+1);
6263 REGTAIL(pRExC_state, lastbr, br); /* BRANCH -> BRANCH. */
6265 *flagp |= flags & (SPSTART | HASWIDTH | POSTPONED);
6268 if (have_branch || paren != ':') {
6269 /* Make a closing node, and hook it on the end. */
6272 ender = reg_node(pRExC_state, TAIL);
6275 ender = reganode(pRExC_state, CLOSE, parno);
6276 if (!SIZE_ONLY && RExC_seen & REG_SEEN_RECURSE) {
6277 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
6278 "Setting close paren #%"IVdf" to %d\n",
6279 (IV)parno, REG_NODE_NUM(ender)));
6280 RExC_close_parens[parno-1]= ender;
6281 if (RExC_nestroot == parno)
6284 Set_Node_Offset(ender,RExC_parse+1); /* MJD */
6285 Set_Node_Length(ender,1); /* MJD */
6291 *flagp &= ~HASWIDTH;
6294 ender = reg_node(pRExC_state, SUCCEED);
6297 ender = reg_node(pRExC_state, END);
6299 assert(!RExC_opend); /* there can only be one! */
6304 REGTAIL(pRExC_state, lastbr, ender);
6306 if (have_branch && !SIZE_ONLY) {
6308 RExC_seen |= REG_TOP_LEVEL_BRANCHES;
6310 /* Hook the tails of the branches to the closing node. */
6311 for (br = ret; br; br = regnext(br)) {
6312 const U8 op = PL_regkind[OP(br)];
6314 REGTAIL_STUDY(pRExC_state, NEXTOPER(br), ender);
6316 else if (op == BRANCHJ) {
6317 REGTAIL_STUDY(pRExC_state, NEXTOPER(NEXTOPER(br)), ender);
6325 static const char parens[] = "=!<,>";
6327 if (paren && (p = strchr(parens, paren))) {
6328 U8 node = ((p - parens) % 2) ? UNLESSM : IFMATCH;
6329 int flag = (p - parens) > 1;
6332 node = SUSPEND, flag = 0;
6333 reginsert(pRExC_state, node,ret, depth+1);
6334 Set_Node_Cur_Length(ret);
6335 Set_Node_Offset(ret, parse_start + 1);
6337 REGTAIL_STUDY(pRExC_state, ret, reg_node(pRExC_state, TAIL));
6341 /* Check for proper termination. */
6343 RExC_flags = oregflags;
6344 if (RExC_parse >= RExC_end || *nextchar(pRExC_state) != ')') {
6345 RExC_parse = oregcomp_parse;
6346 vFAIL("Unmatched (");
6349 else if (!paren && RExC_parse < RExC_end) {
6350 if (*RExC_parse == ')') {
6352 vFAIL("Unmatched )");
6355 FAIL("Junk on end of regexp"); /* "Can't happen". */
6359 RExC_npar = after_freeze;
6364 - regbranch - one alternative of an | operator
6366 * Implements the concatenation operator.
6369 S_regbranch(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, I32 first, U32 depth)
6372 register regnode *ret;
6373 register regnode *chain = NULL;
6374 register regnode *latest;
6375 I32 flags = 0, c = 0;
6376 GET_RE_DEBUG_FLAGS_DECL;
6378 PERL_ARGS_ASSERT_REGBRANCH;
6380 DEBUG_PARSE("brnc");
6385 if (!SIZE_ONLY && RExC_extralen)
6386 ret = reganode(pRExC_state, BRANCHJ,0);
6388 ret = reg_node(pRExC_state, BRANCH);
6389 Set_Node_Length(ret, 1);
6393 if (!first && SIZE_ONLY)
6394 RExC_extralen += 1; /* BRANCHJ */
6396 *flagp = WORST; /* Tentatively. */
6399 nextchar(pRExC_state);
6400 while (RExC_parse < RExC_end && *RExC_parse != '|' && *RExC_parse != ')') {
6402 latest = regpiece(pRExC_state, &flags,depth+1);
6403 if (latest == NULL) {
6404 if (flags & TRYAGAIN)
6408 else if (ret == NULL)
6410 *flagp |= flags&(HASWIDTH|POSTPONED);
6411 if (chain == NULL) /* First piece. */
6412 *flagp |= flags&SPSTART;
6415 REGTAIL(pRExC_state, chain, latest);
6420 if (chain == NULL) { /* Loop ran zero times. */
6421 chain = reg_node(pRExC_state, NOTHING);
6426 *flagp |= flags&SIMPLE;
6433 - regpiece - something followed by possible [*+?]
6435 * Note that the branching code sequences used for ? and the general cases
6436 * of * and + are somewhat optimized: they use the same NOTHING node as
6437 * both the endmarker for their branch list and the body of the last branch.
6438 * It might seem that this node could be dispensed with entirely, but the
6439 * endmarker role is not redundant.
6442 S_regpiece(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
6445 register regnode *ret;
6447 register char *next;
6449 const char * const origparse = RExC_parse;
6451 I32 max = REG_INFTY;
6453 const char *maxpos = NULL;
6454 GET_RE_DEBUG_FLAGS_DECL;
6456 PERL_ARGS_ASSERT_REGPIECE;
6458 DEBUG_PARSE("piec");
6460 ret = regatom(pRExC_state, &flags,depth+1);
6462 if (flags & TRYAGAIN)
6469 if (op == '{' && regcurly(RExC_parse)) {
6471 parse_start = RExC_parse; /* MJD */
6472 next = RExC_parse + 1;
6473 while (isDIGIT(*next) || *next == ',') {
6482 if (*next == '}') { /* got one */
6486 min = atoi(RExC_parse);
6490 maxpos = RExC_parse;
6492 if (!max && *maxpos != '0')
6493 max = REG_INFTY; /* meaning "infinity" */
6494 else if (max >= REG_INFTY)
6495 vFAIL2("Quantifier in {,} bigger than %d", REG_INFTY - 1);
6497 nextchar(pRExC_state);
6500 if ((flags&SIMPLE)) {
6501 RExC_naughty += 2 + RExC_naughty / 2;
6502 reginsert(pRExC_state, CURLY, ret, depth+1);
6503 Set_Node_Offset(ret, parse_start+1); /* MJD */
6504 Set_Node_Cur_Length(ret);
6507 regnode * const w = reg_node(pRExC_state, WHILEM);
6510 REGTAIL(pRExC_state, ret, w);
6511 if (!SIZE_ONLY && RExC_extralen) {
6512 reginsert(pRExC_state, LONGJMP,ret, depth+1);
6513 reginsert(pRExC_state, NOTHING,ret, depth+1);
6514 NEXT_OFF(ret) = 3; /* Go over LONGJMP. */
6516 reginsert(pRExC_state, CURLYX,ret, depth+1);
6518 Set_Node_Offset(ret, parse_start+1);
6519 Set_Node_Length(ret,
6520 op == '{' ? (RExC_parse - parse_start) : 1);
6522 if (!SIZE_ONLY && RExC_extralen)
6523 NEXT_OFF(ret) = 3; /* Go over NOTHING to LONGJMP. */
6524 REGTAIL(pRExC_state, ret, reg_node(pRExC_state, NOTHING));
6526 RExC_whilem_seen++, RExC_extralen += 3;
6527 RExC_naughty += 4 + RExC_naughty; /* compound interest */
6536 vFAIL("Can't do {n,m} with n > m");
6538 ARG1_SET(ret, (U16)min);
6539 ARG2_SET(ret, (U16)max);
6551 #if 0 /* Now runtime fix should be reliable. */
6553 /* if this is reinstated, don't forget to put this back into perldiag:
6555 =item Regexp *+ operand could be empty at {#} in regex m/%s/
6557 (F) The part of the regexp subject to either the * or + quantifier
6558 could match an empty string. The {#} shows in the regular
6559 expression about where the problem was discovered.
6563 if (!(flags&HASWIDTH) && op != '?')
6564 vFAIL("Regexp *+ operand could be empty");
6567 parse_start = RExC_parse;
6568 nextchar(pRExC_state);
6570 *flagp = (op != '+') ? (WORST|SPSTART|HASWIDTH) : (WORST|HASWIDTH);
6572 if (op == '*' && (flags&SIMPLE)) {
6573 reginsert(pRExC_state, STAR, ret, depth+1);
6577 else if (op == '*') {
6581 else if (op == '+' && (flags&SIMPLE)) {
6582 reginsert(pRExC_state, PLUS, ret, depth+1);
6586 else if (op == '+') {
6590 else if (op == '?') {
6595 if (!SIZE_ONLY && !(flags&(HASWIDTH|POSTPONED)) && max > REG_INFTY/3) {
6596 ckWARN3reg(RExC_parse,
6597 "%.*s matches null string many times",
6598 (int)(RExC_parse >= origparse ? RExC_parse - origparse : 0),
6602 if (RExC_parse < RExC_end && *RExC_parse == '?') {
6603 nextchar(pRExC_state);
6604 reginsert(pRExC_state, MINMOD, ret, depth+1);
6605 REGTAIL(pRExC_state, ret, ret + NODE_STEP_REGNODE);
6607 #ifndef REG_ALLOW_MINMOD_SUSPEND
6610 if (RExC_parse < RExC_end && *RExC_parse == '+') {
6612 nextchar(pRExC_state);
6613 ender = reg_node(pRExC_state, SUCCEED);
6614 REGTAIL(pRExC_state, ret, ender);
6615 reginsert(pRExC_state, SUSPEND, ret, depth+1);
6617 ender = reg_node(pRExC_state, TAIL);
6618 REGTAIL(pRExC_state, ret, ender);
6622 if (RExC_parse < RExC_end && ISMULT2(RExC_parse)) {
6624 vFAIL("Nested quantifiers");
6631 /* reg_namedseq(pRExC_state,UVp)
6633 This is expected to be called by a parser routine that has
6634 recognized '\N' and needs to handle the rest. RExC_parse is
6635 expected to point at the first char following the N at the time
6638 The \N may be inside (indicated by valuep not being NULL) or outside a
6641 \N may begin either a named sequence, or if outside a character class, mean
6642 to match a non-newline. For non single-quoted regexes, the tokenizer has
6643 attempted to decide which, and in the case of a named sequence converted it
6644 into one of the forms: \N{} (if the sequence is null), or \N{U+c1.c2...},
6645 where c1... are the characters in the sequence. For single-quoted regexes,
6646 the tokenizer passes the \N sequence through unchanged; this code will not
6647 attempt to determine this nor expand those. The net effect is that if the
6648 beginning of the passed-in pattern isn't '{U+' or there is no '}', it
6649 signals that this \N occurrence means to match a non-newline.
6651 Only the \N{U+...} form should occur in a character class, for the same
6652 reason that '.' inside a character class means to just match a period: it
6653 just doesn't make sense.
6655 If valuep is non-null then it is assumed that we are parsing inside
6656 of a charclass definition and the first codepoint in the resolved
6657 string is returned via *valuep and the routine will return NULL.
6658 In this mode if a multichar string is returned from the charnames
6659 handler, a warning will be issued, and only the first char in the
6660 sequence will be examined. If the string returned is zero length
6661 then the value of *valuep is undefined and NON-NULL will
6662 be returned to indicate failure. (This will NOT be a valid pointer
6665 If valuep is null then it is assumed that we are parsing normal text and a
6666 new EXACT node is inserted into the program containing the resolved string,
6667 and a pointer to the new node is returned. But if the string is zero length
6668 a NOTHING node is emitted instead.
6670 On success RExC_parse is set to the char following the endbrace.
6671 Parsing failures will generate a fatal error via vFAIL(...)
6674 S_reg_namedseq(pTHX_ RExC_state_t *pRExC_state, UV *valuep, I32 *flagp)
6676 char * endbrace; /* '}' following the name */
6677 regnode *ret = NULL;
6679 char* parse_start = RExC_parse - 2; /* points to the '\N' */
6683 GET_RE_DEBUG_FLAGS_DECL;
6685 PERL_ARGS_ASSERT_REG_NAMEDSEQ;
6689 /* The [^\n] meaning of \N ignores spaces and comments under the /x
6690 * modifier. The other meaning does not */
6691 p = (RExC_flags & RXf_PMf_EXTENDED)
6692 ? regwhite( pRExC_state, RExC_parse )
6695 /* Disambiguate between \N meaning a named character versus \N meaning
6696 * [^\n]. The former is assumed when it can't be the latter. */
6697 if (*p != '{' || regcurly(p)) {
6700 /* no bare \N in a charclass */
6701 vFAIL("\\N in a character class must be a named character: \\N{...}");
6703 nextchar(pRExC_state);
6704 ret = reg_node(pRExC_state, REG_ANY);
6705 *flagp |= HASWIDTH|SIMPLE;
6708 Set_Node_Length(ret, 1); /* MJD */
6712 /* Here, we have decided it should be a named sequence */
6714 /* The test above made sure that the next real character is a '{', but
6715 * under the /x modifier, it could be separated by space (or a comment and
6716 * \n) and this is not allowed (for consistency with \x{...} and the
6717 * tokenizer handling of \N{NAME}). */
6718 if (*RExC_parse != '{') {
6719 vFAIL("Missing braces on \\N{}");
6722 RExC_parse++; /* Skip past the '{' */
6724 if (! (endbrace = strchr(RExC_parse, '}')) /* no trailing brace */
6725 || ! (endbrace == RExC_parse /* nothing between the {} */
6726 || (endbrace - RExC_parse >= 2 /* U+ (bad hex is checked below */
6727 && strnEQ(RExC_parse, "U+", 2)))) /* for a better error msg) */
6729 if (endbrace) RExC_parse = endbrace; /* position msg's '<--HERE' */
6730 vFAIL("\\N{NAME} must be resolved by the lexer");
6733 if (endbrace == RExC_parse) { /* empty: \N{} */
6735 RExC_parse = endbrace + 1;
6736 return reg_node(pRExC_state,NOTHING);
6740 ckWARNreg(RExC_parse,
6741 "Ignoring zero length \\N{} in character class"
6743 RExC_parse = endbrace + 1;
6746 return (regnode *) &RExC_parse; /* Invalid regnode pointer */
6749 RExC_utf8 = 1; /* named sequences imply Unicode semantics */
6750 RExC_parse += 2; /* Skip past the 'U+' */
6752 if (valuep) { /* In a bracketed char class */
6753 /* We only pay attention to the first char of
6754 multichar strings being returned. I kinda wonder
6755 if this makes sense as it does change the behaviour
6756 from earlier versions, OTOH that behaviour was broken
6757 as well. XXX Solution is to recharacterize as
6758 [rest-of-class]|multi1|multi2... */
6760 STRLEN length_of_hex;
6761 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
6762 | PERL_SCAN_DISALLOW_PREFIX
6763 | (SIZE_ONLY ? PERL_SCAN_SILENT_ILLDIGIT : 0);
6765 char * endchar = RExC_parse + strcspn(RExC_parse, ".}");
6766 if (endchar < endbrace) {
6767 ckWARNreg(endchar, "Using just the first character returned by \\N{} in character class");
6770 length_of_hex = (STRLEN)(endchar - RExC_parse);
6771 *valuep = grok_hex(RExC_parse, &length_of_hex, &flags, NULL);
6773 /* The tokenizer should have guaranteed validity, but it's possible to
6774 * bypass it by using single quoting, so check */
6775 if (length_of_hex == 0
6776 || length_of_hex != (STRLEN)(endchar - RExC_parse) )
6778 RExC_parse += length_of_hex; /* Includes all the valid */
6779 RExC_parse += (RExC_orig_utf8) /* point to after 1st invalid */
6780 ? UTF8SKIP(RExC_parse)
6782 /* Guard against malformed utf8 */
6783 if (RExC_parse >= endchar) RExC_parse = endchar;
6784 vFAIL("Invalid hexadecimal number in \\N{U+...}");
6787 RExC_parse = endbrace + 1;
6788 if (endchar == endbrace) return NULL;
6790 ret = (regnode *) &RExC_parse; /* Invalid regnode pointer */
6792 else { /* Not a char class */
6793 char *s; /* String to put in generated EXACT node */
6794 STRLEN len = 0; /* Its current length */
6795 char *endchar; /* Points to '.' or '}' ending cur char in the input
6798 ret = reg_node(pRExC_state,
6799 (U8)(FOLD ? (LOC ? EXACTFL : EXACTF) : EXACT));
6802 /* Exact nodes can hold only a U8 length's of text = 255. Loop through
6803 * the input which is of the form now 'c1.c2.c3...}' until find the
6804 * ending brace or exeed length 255. The characters that exceed this
6805 * limit are dropped. The limit could be relaxed should it become
6806 * desirable by reparsing this as (?:\N{NAME}), so could generate
6807 * multiple EXACT nodes, as is done for just regular input. But this
6808 * is primarily a named character, and not intended to be a huge long
6809 * string, so 255 bytes should be good enough */
6811 STRLEN length_of_hex;
6812 I32 grok_flags = PERL_SCAN_ALLOW_UNDERSCORES
6813 | PERL_SCAN_DISALLOW_PREFIX
6814 | (SIZE_ONLY ? PERL_SCAN_SILENT_ILLDIGIT : 0);
6815 UV cp; /* Ord of current character */
6817 /* Code points are separated by dots. If none, there is only one
6818 * code point, and is terminated by the brace */
6819 endchar = RExC_parse + strcspn(RExC_parse, ".}");
6821 /* The values are Unicode even on EBCDIC machines */
6822 length_of_hex = (STRLEN)(endchar - RExC_parse);
6823 cp = grok_hex(RExC_parse, &length_of_hex, &grok_flags, NULL);
6824 if ( length_of_hex == 0
6825 || length_of_hex != (STRLEN)(endchar - RExC_parse) )
6827 RExC_parse += length_of_hex; /* Includes all the valid */
6828 RExC_parse += (RExC_orig_utf8) /* point to after 1st invalid */
6829 ? UTF8SKIP(RExC_parse)
6831 /* Guard against malformed utf8 */
6832 if (RExC_parse >= endchar) RExC_parse = endchar;
6833 vFAIL("Invalid hexadecimal number in \\N{U+...}");
6836 if (! FOLD) { /* Not folding, just append to the string */
6839 /* Quit before adding this character if would exceed limit */
6840 if (len + UNISKIP(cp) > U8_MAX) break;
6842 unilen = reguni(pRExC_state, cp, s);
6847 } else { /* Folding, output the folded equivalent */
6848 STRLEN foldlen,numlen;
6849 U8 tmpbuf[UTF8_MAXBYTES_CASE+1], *foldbuf;
6850 cp = toFOLD_uni(cp, tmpbuf, &foldlen);
6852 /* Quit before exceeding size limit */
6853 if (len + foldlen > U8_MAX) break;
6855 for (foldbuf = tmpbuf;
6859 cp = utf8_to_uvchr(foldbuf, &numlen);
6861 const STRLEN unilen = reguni(pRExC_state, cp, s);
6864 /* In EBCDIC the numlen and unilen can differ. */
6866 if (numlen >= foldlen)
6870 break; /* "Can't happen." */
6874 /* Point to the beginning of the next character in the sequence. */
6875 RExC_parse = endchar + 1;
6877 /* Quit if no more characters */
6878 if (RExC_parse >= endbrace) break;
6883 if (RExC_parse < endbrace) {
6884 ckWARNreg(RExC_parse - 1,
6885 "Using just the first characters returned by \\N{}");
6888 RExC_size += STR_SZ(len);
6891 RExC_emit += STR_SZ(len);
6894 RExC_parse = endbrace + 1;
6896 *flagp |= HASWIDTH; /* Not SIMPLE, as that causes the engine to fail
6897 with malformed in t/re/pat_advanced.t */
6899 Set_Node_Cur_Length(ret); /* MJD */
6900 nextchar(pRExC_state);
6910 * It returns the code point in utf8 for the value in *encp.
6911 * value: a code value in the source encoding
6912 * encp: a pointer to an Encode object
6914 * If the result from Encode is not a single character,
6915 * it returns U+FFFD (Replacement character) and sets *encp to NULL.
6918 S_reg_recode(pTHX_ const char value, SV **encp)
6921 SV * const sv = newSVpvn_flags(&value, numlen, SVs_TEMP);
6922 const char * const s = *encp ? sv_recode_to_utf8(sv, *encp) : SvPVX(sv);
6923 const STRLEN newlen = SvCUR(sv);
6924 UV uv = UNICODE_REPLACEMENT;
6926 PERL_ARGS_ASSERT_REG_RECODE;
6930 ? utf8n_to_uvchr((U8*)s, newlen, &numlen, UTF8_ALLOW_DEFAULT)
6933 if (!newlen || numlen != newlen) {
6934 uv = UNICODE_REPLACEMENT;
6942 - regatom - the lowest level
6944 Try to identify anything special at the start of the pattern. If there
6945 is, then handle it as required. This may involve generating a single regop,
6946 such as for an assertion; or it may involve recursing, such as to
6947 handle a () structure.
6949 If the string doesn't start with something special then we gobble up
6950 as much literal text as we can.
6952 Once we have been able to handle whatever type of thing started the
6953 sequence, we return.
6955 Note: we have to be careful with escapes, as they can be both literal
6956 and special, and in the case of \10 and friends can either, depending
6957 on context. Specifically there are two seperate switches for handling
6958 escape sequences, with the one for handling literal escapes requiring
6959 a dummy entry for all of the special escapes that are actually handled
6964 S_regatom(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
6967 register regnode *ret = NULL;
6969 char *parse_start = RExC_parse;
6970 GET_RE_DEBUG_FLAGS_DECL;
6971 DEBUG_PARSE("atom");
6972 *flagp = WORST; /* Tentatively. */
6974 PERL_ARGS_ASSERT_REGATOM;
6977 switch ((U8)*RExC_parse) {
6979 RExC_seen_zerolen++;
6980 nextchar(pRExC_state);
6981 if (RExC_flags & RXf_PMf_MULTILINE)
6982 ret = reg_node(pRExC_state, MBOL);
6983 else if (RExC_flags & RXf_PMf_SINGLELINE)
6984 ret = reg_node(pRExC_state, SBOL);
6986 ret = reg_node(pRExC_state, BOL);
6987 Set_Node_Length(ret, 1); /* MJD */
6990 nextchar(pRExC_state);
6992 RExC_seen_zerolen++;
6993 if (RExC_flags & RXf_PMf_MULTILINE)
6994 ret = reg_node(pRExC_state, MEOL);
6995 else if (RExC_flags & RXf_PMf_SINGLELINE)
6996 ret = reg_node(pRExC_state, SEOL);
6998 ret = reg_node(pRExC_state, EOL);
6999 Set_Node_Length(ret, 1); /* MJD */
7002 nextchar(pRExC_state);
7003 if (RExC_flags & RXf_PMf_SINGLELINE)
7004 ret = reg_node(pRExC_state, SANY);
7006 ret = reg_node(pRExC_state, REG_ANY);
7007 *flagp |= HASWIDTH|SIMPLE;
7009 Set_Node_Length(ret, 1); /* MJD */
7013 char * const oregcomp_parse = ++RExC_parse;
7014 ret = regclass(pRExC_state,depth+1);
7015 if (*RExC_parse != ']') {
7016 RExC_parse = oregcomp_parse;
7017 vFAIL("Unmatched [");
7019 nextchar(pRExC_state);
7020 *flagp |= HASWIDTH|SIMPLE;
7021 Set_Node_Length(ret, RExC_parse - oregcomp_parse + 1); /* MJD */
7025 nextchar(pRExC_state);
7026 ret = reg(pRExC_state, 1, &flags,depth+1);
7028 if (flags & TRYAGAIN) {
7029 if (RExC_parse == RExC_end) {
7030 /* Make parent create an empty node if needed. */
7038 *flagp |= flags&(HASWIDTH|SPSTART|SIMPLE|POSTPONED);
7042 if (flags & TRYAGAIN) {
7046 vFAIL("Internal urp");
7047 /* Supposed to be caught earlier. */
7050 if (!regcurly(RExC_parse)) {
7059 vFAIL("Quantifier follows nothing");
7067 len=0; /* silence a spurious compiler warning */
7068 if ((cp = what_len_TRICKYFOLD_safe(RExC_parse,RExC_end,UTF,len))) {
7069 *flagp |= HASWIDTH; /* could be SIMPLE too, but needs a handler in regexec.regrepeat */
7070 RExC_parse+=len-1; /* we get one from nextchar() as well. :-( */
7071 ret = reganode(pRExC_state, FOLDCHAR, cp);
7072 Set_Node_Length(ret, 1); /* MJD */
7073 nextchar(pRExC_state); /* kill whitespace under /x */
7081 This switch handles escape sequences that resolve to some kind
7082 of special regop and not to literal text. Escape sequnces that
7083 resolve to literal text are handled below in the switch marked
7086 Every entry in this switch *must* have a corresponding entry
7087 in the literal escape switch. However, the opposite is not
7088 required, as the default for this switch is to jump to the
7089 literal text handling code.
7091 switch ((U8)*++RExC_parse) {
7096 /* Special Escapes */
7098 RExC_seen_zerolen++;
7099 ret = reg_node(pRExC_state, SBOL);
7101 goto finish_meta_pat;
7103 ret = reg_node(pRExC_state, GPOS);
7104 RExC_seen |= REG_SEEN_GPOS;
7106 goto finish_meta_pat;
7108 RExC_seen_zerolen++;
7109 ret = reg_node(pRExC_state, KEEPS);
7111 /* XXX:dmq : disabling in-place substitution seems to
7112 * be necessary here to avoid cases of memory corruption, as
7113 * with: C<$_="x" x 80; s/x\K/y/> -- rgs
7115 RExC_seen |= REG_SEEN_LOOKBEHIND;
7116 goto finish_meta_pat;
7118 ret = reg_node(pRExC_state, SEOL);
7120 RExC_seen_zerolen++; /* Do not optimize RE away */
7121 goto finish_meta_pat;
7123 ret = reg_node(pRExC_state, EOS);
7125 RExC_seen_zerolen++; /* Do not optimize RE away */
7126 goto finish_meta_pat;
7128 ret = reg_node(pRExC_state, CANY);
7129 RExC_seen |= REG_SEEN_CANY;
7130 *flagp |= HASWIDTH|SIMPLE;
7131 goto finish_meta_pat;
7133 ret = reg_node(pRExC_state, CLUMP);
7135 goto finish_meta_pat;
7137 ret = reg_node(pRExC_state, (U8)(LOC ? ALNUML : ALNUM));
7138 *flagp |= HASWIDTH|SIMPLE;
7139 goto finish_meta_pat;
7141 ret = reg_node(pRExC_state, (U8)(LOC ? NALNUML : NALNUM));
7142 *flagp |= HASWIDTH|SIMPLE;
7143 goto finish_meta_pat;
7145 RExC_seen_zerolen++;
7146 RExC_seen |= REG_SEEN_LOOKBEHIND;
7147 ret = reg_node(pRExC_state, (U8)(LOC ? BOUNDL : BOUND));
7149 goto finish_meta_pat;
7151 RExC_seen_zerolen++;
7152 RExC_seen |= REG_SEEN_LOOKBEHIND;
7153 ret = reg_node(pRExC_state, (U8)(LOC ? NBOUNDL : NBOUND));
7155 goto finish_meta_pat;
7157 ret = reg_node(pRExC_state, (U8)(LOC ? SPACEL : SPACE));
7158 *flagp |= HASWIDTH|SIMPLE;
7159 goto finish_meta_pat;
7161 ret = reg_node(pRExC_state, (U8)(LOC ? NSPACEL : NSPACE));
7162 *flagp |= HASWIDTH|SIMPLE;
7163 goto finish_meta_pat;
7165 ret = reg_node(pRExC_state, DIGIT);
7166 *flagp |= HASWIDTH|SIMPLE;
7167 goto finish_meta_pat;
7169 ret = reg_node(pRExC_state, NDIGIT);
7170 *flagp |= HASWIDTH|SIMPLE;
7171 goto finish_meta_pat;
7173 ret = reg_node(pRExC_state, LNBREAK);
7174 *flagp |= HASWIDTH|SIMPLE;
7175 goto finish_meta_pat;
7177 ret = reg_node(pRExC_state, HORIZWS);
7178 *flagp |= HASWIDTH|SIMPLE;
7179 goto finish_meta_pat;
7181 ret = reg_node(pRExC_state, NHORIZWS);
7182 *flagp |= HASWIDTH|SIMPLE;
7183 goto finish_meta_pat;
7185 ret = reg_node(pRExC_state, VERTWS);
7186 *flagp |= HASWIDTH|SIMPLE;
7187 goto finish_meta_pat;
7189 ret = reg_node(pRExC_state, NVERTWS);
7190 *flagp |= HASWIDTH|SIMPLE;
7192 nextchar(pRExC_state);
7193 Set_Node_Length(ret, 2); /* MJD */
7198 char* const oldregxend = RExC_end;
7200 char* parse_start = RExC_parse - 2;
7203 if (RExC_parse[1] == '{') {
7204 /* a lovely hack--pretend we saw [\pX] instead */
7205 RExC_end = strchr(RExC_parse, '}');
7207 const U8 c = (U8)*RExC_parse;
7209 RExC_end = oldregxend;
7210 vFAIL2("Missing right brace on \\%c{}", c);
7215 RExC_end = RExC_parse + 2;
7216 if (RExC_end > oldregxend)
7217 RExC_end = oldregxend;
7221 ret = regclass(pRExC_state,depth+1);
7223 RExC_end = oldregxend;
7226 Set_Node_Offset(ret, parse_start + 2);
7227 Set_Node_Cur_Length(ret);
7228 nextchar(pRExC_state);
7229 *flagp |= HASWIDTH|SIMPLE;
7233 /* Handle \N and \N{NAME} here and not below because it can be
7234 multicharacter. join_exact() will join them up later on.
7235 Also this makes sure that things like /\N{BLAH}+/ and
7236 \N{BLAH} being multi char Just Happen. dmq*/
7238 ret= reg_namedseq(pRExC_state, NULL, flagp);
7240 case 'k': /* Handle \k<NAME> and \k'NAME' */
7243 char ch= RExC_parse[1];
7244 if (ch != '<' && ch != '\'' && ch != '{') {
7246 vFAIL2("Sequence %.2s... not terminated",parse_start);
7248 /* this pretty much dupes the code for (?P=...) in reg(), if
7249 you change this make sure you change that */
7250 char* name_start = (RExC_parse += 2);
7252 SV *sv_dat = reg_scan_name(pRExC_state,
7253 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
7254 ch= (ch == '<') ? '>' : (ch == '{') ? '}' : '\'';
7255 if (RExC_parse == name_start || *RExC_parse != ch)
7256 vFAIL2("Sequence %.3s... not terminated",parse_start);
7259 num = add_data( pRExC_state, 1, "S" );
7260 RExC_rxi->data->data[num]=(void*)sv_dat;
7261 SvREFCNT_inc_simple_void(sv_dat);
7265 ret = reganode(pRExC_state,
7266 (U8)(FOLD ? (LOC ? NREFFL : NREFF) : NREF),
7270 /* override incorrect value set in reganode MJD */
7271 Set_Node_Offset(ret, parse_start+1);
7272 Set_Node_Cur_Length(ret); /* MJD */
7273 nextchar(pRExC_state);
7279 case '1': case '2': case '3': case '4':
7280 case '5': case '6': case '7': case '8': case '9':
7283 bool isg = *RExC_parse == 'g';
7288 if (*RExC_parse == '{') {
7292 if (*RExC_parse == '-') {
7296 if (hasbrace && !isDIGIT(*RExC_parse)) {
7297 if (isrel) RExC_parse--;
7299 goto parse_named_seq;
7301 num = atoi(RExC_parse);
7302 if (isg && num == 0)
7303 vFAIL("Reference to invalid group 0");
7305 num = RExC_npar - num;
7307 vFAIL("Reference to nonexistent or unclosed group");
7309 if (!isg && num > 9 && num >= RExC_npar)
7312 char * const parse_start = RExC_parse - 1; /* MJD */
7313 while (isDIGIT(*RExC_parse))
7315 if (parse_start == RExC_parse - 1)
7316 vFAIL("Unterminated \\g... pattern");
7318 if (*RExC_parse != '}')
7319 vFAIL("Unterminated \\g{...} pattern");
7323 if (num > (I32)RExC_rx->nparens)
7324 vFAIL("Reference to nonexistent group");
7327 ret = reganode(pRExC_state,
7328 (U8)(FOLD ? (LOC ? REFFL : REFF) : REF),
7332 /* override incorrect value set in reganode MJD */
7333 Set_Node_Offset(ret, parse_start+1);
7334 Set_Node_Cur_Length(ret); /* MJD */
7336 nextchar(pRExC_state);
7341 if (RExC_parse >= RExC_end)
7342 FAIL("Trailing \\");
7345 /* Do not generate "unrecognized" warnings here, we fall
7346 back into the quick-grab loop below */
7353 if (RExC_flags & RXf_PMf_EXTENDED) {
7354 if ( reg_skipcomment( pRExC_state ) )
7361 register STRLEN len;
7366 U8 tmpbuf[UTF8_MAXBYTES_CASE+1], *foldbuf;
7368 parse_start = RExC_parse - 1;
7374 ret = reg_node(pRExC_state,
7375 (U8)(FOLD ? (LOC ? EXACTFL : EXACTF) : EXACT));
7377 for (len = 0, p = RExC_parse - 1;
7378 len < 127 && p < RExC_end;
7381 char * const oldp = p;
7383 if (RExC_flags & RXf_PMf_EXTENDED)
7384 p = regwhite( pRExC_state, p );
7389 if (LOC || !FOLD || !is_TRICKYFOLD_safe(p,RExC_end,UTF))
7390 goto normal_default;
7400 /* Literal Escapes Switch
7402 This switch is meant to handle escape sequences that
7403 resolve to a literal character.
7405 Every escape sequence that represents something
7406 else, like an assertion or a char class, is handled
7407 in the switch marked 'Special Escapes' above in this
7408 routine, but also has an entry here as anything that
7409 isn't explicitly mentioned here will be treated as
7410 an unescaped equivalent literal.
7414 /* These are all the special escapes. */
7418 if (LOC || !FOLD || !is_TRICKYFOLD_safe(p,RExC_end,UTF))
7419 goto normal_default;
7420 case 'A': /* Start assertion */
7421 case 'b': case 'B': /* Word-boundary assertion*/
7422 case 'C': /* Single char !DANGEROUS! */
7423 case 'd': case 'D': /* digit class */
7424 case 'g': case 'G': /* generic-backref, pos assertion */
7425 case 'h': case 'H': /* HORIZWS */
7426 case 'k': case 'K': /* named backref, keep marker */
7427 case 'N': /* named char sequence */
7428 case 'p': case 'P': /* Unicode property */
7429 case 'R': /* LNBREAK */
7430 case 's': case 'S': /* space class */
7431 case 'v': case 'V': /* VERTWS */
7432 case 'w': case 'W': /* word class */
7433 case 'X': /* eXtended Unicode "combining character sequence" */
7434 case 'z': case 'Z': /* End of line/string assertion */
7438 /* Anything after here is an escape that resolves to a
7439 literal. (Except digits, which may or may not)
7458 ender = ASCII_TO_NATIVE('\033');
7462 ender = ASCII_TO_NATIVE('\007');
7467 STRLEN brace_len = len;
7469 const char* error_msg;
7471 bool valid = grok_bslash_o(p,
7478 RExC_parse = p; /* going to die anyway; point
7479 to exact spot of failure */
7486 if (PL_encoding && ender < 0x100) {
7487 goto recode_encoding;
7496 char* const e = strchr(p, '}');
7500 vFAIL("Missing right brace on \\x{}");
7503 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
7504 | PERL_SCAN_DISALLOW_PREFIX;
7505 STRLEN numlen = e - p - 1;
7506 ender = grok_hex(p + 1, &numlen, &flags, NULL);
7513 I32 flags = PERL_SCAN_DISALLOW_PREFIX;
7515 ender = grok_hex(p, &numlen, &flags, NULL);
7518 if (PL_encoding && ender < 0x100)
7519 goto recode_encoding;
7523 ender = grok_bslash_c(*p++, SIZE_ONLY);
7525 case '0': case '1': case '2': case '3':case '4':
7526 case '5': case '6': case '7': case '8':case '9':
7528 (isDIGIT(p[1]) && atoi(p) >= RExC_npar) ) {
7531 ender = grok_oct(p, &numlen, &flags, NULL);
7541 if (PL_encoding && ender < 0x100)
7542 goto recode_encoding;
7546 SV* enc = PL_encoding;
7547 ender = reg_recode((const char)(U8)ender, &enc);
7548 if (!enc && SIZE_ONLY)
7549 ckWARNreg(p, "Invalid escape in the specified encoding");
7555 FAIL("Trailing \\");
7558 if (!SIZE_ONLY&& isALPHA(*p))
7559 ckWARN2reg(p + 1, "Unrecognized escape \\%c passed through", UCHARAT(p));
7560 goto normal_default;
7565 if (UTF8_IS_START(*p) && UTF) {
7567 ender = utf8n_to_uvchr((U8*)p, RExC_end - p,
7568 &numlen, UTF8_ALLOW_DEFAULT);
7575 if ( RExC_flags & RXf_PMf_EXTENDED)
7576 p = regwhite( pRExC_state, p );
7578 /* Prime the casefolded buffer. */
7579 ender = toFOLD_uni(ender, tmpbuf, &foldlen);
7581 if (p < RExC_end && ISMULT2(p)) { /* Back off on ?+*. */
7586 /* Emit all the Unicode characters. */
7588 for (foldbuf = tmpbuf;
7590 foldlen -= numlen) {
7591 ender = utf8_to_uvchr(foldbuf, &numlen);
7593 const STRLEN unilen = reguni(pRExC_state, ender, s);
7596 /* In EBCDIC the numlen
7597 * and unilen can differ. */
7599 if (numlen >= foldlen)
7603 break; /* "Can't happen." */
7607 const STRLEN unilen = reguni(pRExC_state, ender, s);
7616 REGC((char)ender, s++);
7622 /* Emit all the Unicode characters. */
7624 for (foldbuf = tmpbuf;
7626 foldlen -= numlen) {
7627 ender = utf8_to_uvchr(foldbuf, &numlen);
7629 const STRLEN unilen = reguni(pRExC_state, ender, s);
7632 /* In EBCDIC the numlen
7633 * and unilen can differ. */
7635 if (numlen >= foldlen)
7643 const STRLEN unilen = reguni(pRExC_state, ender, s);
7652 REGC((char)ender, s++);
7656 Set_Node_Cur_Length(ret); /* MJD */
7657 nextchar(pRExC_state);
7659 /* len is STRLEN which is unsigned, need to copy to signed */
7662 vFAIL("Internal disaster");
7666 if (len == 1 && UNI_IS_INVARIANT(ender))
7670 RExC_size += STR_SZ(len);
7673 RExC_emit += STR_SZ(len);
7683 S_regwhite( RExC_state_t *pRExC_state, char *p )
7685 const char *e = RExC_end;
7687 PERL_ARGS_ASSERT_REGWHITE;
7692 else if (*p == '#') {
7701 RExC_seen |= REG_SEEN_RUN_ON_COMMENT;
7709 /* Parse POSIX character classes: [[:foo:]], [[=foo=]], [[.foo.]].
7710 Character classes ([:foo:]) can also be negated ([:^foo:]).
7711 Returns a named class id (ANYOF_XXX) if successful, -1 otherwise.
7712 Equivalence classes ([=foo=]) and composites ([.foo.]) are parsed,
7713 but trigger failures because they are currently unimplemented. */
7715 #define POSIXCC_DONE(c) ((c) == ':')
7716 #define POSIXCC_NOTYET(c) ((c) == '=' || (c) == '.')
7717 #define POSIXCC(c) (POSIXCC_DONE(c) || POSIXCC_NOTYET(c))
7720 S_regpposixcc(pTHX_ RExC_state_t *pRExC_state, I32 value)
7723 I32 namedclass = OOB_NAMEDCLASS;
7725 PERL_ARGS_ASSERT_REGPPOSIXCC;
7727 if (value == '[' && RExC_parse + 1 < RExC_end &&
7728 /* I smell either [: or [= or [. -- POSIX has been here, right? */
7729 POSIXCC(UCHARAT(RExC_parse))) {
7730 const char c = UCHARAT(RExC_parse);
7731 char* const s = RExC_parse++;
7733 while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != c)
7735 if (RExC_parse == RExC_end)
7736 /* Grandfather lone [:, [=, [. */
7739 const char* const t = RExC_parse++; /* skip over the c */
7742 if (UCHARAT(RExC_parse) == ']') {
7743 const char *posixcc = s + 1;
7744 RExC_parse++; /* skip over the ending ] */
7747 const I32 complement = *posixcc == '^' ? *posixcc++ : 0;
7748 const I32 skip = t - posixcc;
7750 /* Initially switch on the length of the name. */
7753 if (memEQ(posixcc, "word", 4)) /* this is not POSIX, this is the Perl \w */
7754 namedclass = complement ? ANYOF_NALNUM : ANYOF_ALNUM;
7757 /* Names all of length 5. */
7758 /* alnum alpha ascii blank cntrl digit graph lower
7759 print punct space upper */
7760 /* Offset 4 gives the best switch position. */
7761 switch (posixcc[4]) {
7763 if (memEQ(posixcc, "alph", 4)) /* alpha */
7764 namedclass = complement ? ANYOF_NALPHA : ANYOF_ALPHA;
7767 if (memEQ(posixcc, "spac", 4)) /* space */
7768 namedclass = complement ? ANYOF_NPSXSPC : ANYOF_PSXSPC;
7771 if (memEQ(posixcc, "grap", 4)) /* graph */
7772 namedclass = complement ? ANYOF_NGRAPH : ANYOF_GRAPH;
7775 if (memEQ(posixcc, "asci", 4)) /* ascii */
7776 namedclass = complement ? ANYOF_NASCII : ANYOF_ASCII;
7779 if (memEQ(posixcc, "blan", 4)) /* blank */
7780 namedclass = complement ? ANYOF_NBLANK : ANYOF_BLANK;
7783 if (memEQ(posixcc, "cntr", 4)) /* cntrl */
7784 namedclass = complement ? ANYOF_NCNTRL : ANYOF_CNTRL;
7787 if (memEQ(posixcc, "alnu", 4)) /* alnum */
7788 namedclass = complement ? ANYOF_NALNUMC : ANYOF_ALNUMC;
7791 if (memEQ(posixcc, "lowe", 4)) /* lower */
7792 namedclass = complement ? ANYOF_NLOWER : ANYOF_LOWER;
7793 else if (memEQ(posixcc, "uppe", 4)) /* upper */
7794 namedclass = complement ? ANYOF_NUPPER : ANYOF_UPPER;
7797 if (memEQ(posixcc, "digi", 4)) /* digit */
7798 namedclass = complement ? ANYOF_NDIGIT : ANYOF_DIGIT;
7799 else if (memEQ(posixcc, "prin", 4)) /* print */
7800 namedclass = complement ? ANYOF_NPRINT : ANYOF_PRINT;
7801 else if (memEQ(posixcc, "punc", 4)) /* punct */
7802 namedclass = complement ? ANYOF_NPUNCT : ANYOF_PUNCT;
7807 if (memEQ(posixcc, "xdigit", 6))
7808 namedclass = complement ? ANYOF_NXDIGIT : ANYOF_XDIGIT;
7812 if (namedclass == OOB_NAMEDCLASS)
7813 Simple_vFAIL3("POSIX class [:%.*s:] unknown",
7815 assert (posixcc[skip] == ':');
7816 assert (posixcc[skip+1] == ']');
7817 } else if (!SIZE_ONLY) {
7818 /* [[=foo=]] and [[.foo.]] are still future. */
7820 /* adjust RExC_parse so the warning shows after
7822 while (UCHARAT(RExC_parse) && UCHARAT(RExC_parse) != ']')
7824 Simple_vFAIL3("POSIX syntax [%c %c] is reserved for future extensions", c, c);
7827 /* Maternal grandfather:
7828 * "[:" ending in ":" but not in ":]" */
7838 S_checkposixcc(pTHX_ RExC_state_t *pRExC_state)
7842 PERL_ARGS_ASSERT_CHECKPOSIXCC;
7844 if (POSIXCC(UCHARAT(RExC_parse))) {
7845 const char *s = RExC_parse;
7846 const char c = *s++;
7850 if (*s && c == *s && s[1] == ']') {
7852 "POSIX syntax [%c %c] belongs inside character classes",
7855 /* [[=foo=]] and [[.foo.]] are still future. */
7856 if (POSIXCC_NOTYET(c)) {
7857 /* adjust RExC_parse so the error shows after
7859 while (UCHARAT(RExC_parse) && UCHARAT(RExC_parse++) != ']')
7861 Simple_vFAIL3("POSIX syntax [%c %c] is reserved for future extensions", c, c);
7868 #define _C_C_T_(NAME,TEST,WORD) \
7871 ANYOF_CLASS_SET(ret, ANYOF_##NAME); \
7873 for (value = 0; value < 256; value++) \
7875 ANYOF_BITMAP_SET(ret, value); \
7880 case ANYOF_N##NAME: \
7882 ANYOF_CLASS_SET(ret, ANYOF_N##NAME); \
7884 for (value = 0; value < 256; value++) \
7886 ANYOF_BITMAP_SET(ret, value); \
7892 #define _C_C_T_NOLOC_(NAME,TEST,WORD) \
7894 for (value = 0; value < 256; value++) \
7896 ANYOF_BITMAP_SET(ret, value); \
7900 case ANYOF_N##NAME: \
7901 for (value = 0; value < 256; value++) \
7903 ANYOF_BITMAP_SET(ret, value); \
7909 We dont use PERL_LEGACY_UNICODE_CHARCLASS_MAPPINGS as the direct test
7910 so that it is possible to override the option here without having to
7911 rebuild the entire core. as we are required to do if we change regcomp.h
7912 which is where PERL_LEGACY_UNICODE_CHARCLASS_MAPPINGS is defined.
7914 #if PERL_LEGACY_UNICODE_CHARCLASS_MAPPINGS
7915 #define BROKEN_UNICODE_CHARCLASS_MAPPINGS
7918 #ifdef BROKEN_UNICODE_CHARCLASS_MAPPINGS
7919 #define POSIX_CC_UNI_NAME(CCNAME) CCNAME
7921 #define POSIX_CC_UNI_NAME(CCNAME) "Posix" CCNAME
7925 parse a class specification and produce either an ANYOF node that
7926 matches the pattern or if the pattern matches a single char only and
7927 that char is < 256 and we are case insensitive then we produce an
7932 S_regclass(pTHX_ RExC_state_t *pRExC_state, U32 depth)
7935 register UV nextvalue;
7936 register IV prevvalue = OOB_UNICODE;
7937 register IV range = 0;
7938 UV value = 0; /* XXX:dmq: needs to be referenceable (unfortunately) */
7939 register regnode *ret;
7942 char *rangebegin = NULL;
7943 bool need_class = 0;
7946 bool optimize_invert = TRUE;
7947 AV* unicode_alternate = NULL;
7949 UV literal_endpoint = 0;
7951 UV stored = 0; /* number of chars stored in the class */
7953 regnode * const orig_emit = RExC_emit; /* Save the original RExC_emit in
7954 case we need to change the emitted regop to an EXACT. */
7955 const char * orig_parse = RExC_parse;
7956 GET_RE_DEBUG_FLAGS_DECL;
7958 PERL_ARGS_ASSERT_REGCLASS;
7960 PERL_UNUSED_ARG(depth);
7963 DEBUG_PARSE("clas");
7965 /* Assume we are going to generate an ANYOF node. */
7966 ret = reganode(pRExC_state, ANYOF, 0);
7969 ANYOF_FLAGS(ret) = 0;
7971 if (UCHARAT(RExC_parse) == '^') { /* Complement of range. */
7975 ANYOF_FLAGS(ret) |= ANYOF_INVERT;
7979 RExC_size += ANYOF_SKIP;
7980 listsv = &PL_sv_undef; /* For code scanners: listsv always non-NULL. */
7983 RExC_emit += ANYOF_SKIP;
7985 ANYOF_FLAGS(ret) |= ANYOF_FOLD;
7987 ANYOF_FLAGS(ret) |= ANYOF_LOCALE;
7988 ANYOF_BITMAP_ZERO(ret);
7989 listsv = newSVpvs("# comment\n");
7992 nextvalue = RExC_parse < RExC_end ? UCHARAT(RExC_parse) : 0;
7994 if (!SIZE_ONLY && POSIXCC(nextvalue))
7995 checkposixcc(pRExC_state);
7997 /* allow 1st char to be ] (allowing it to be - is dealt with later) */
7998 if (UCHARAT(RExC_parse) == ']')
8002 while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != ']') {
8006 namedclass = OOB_NAMEDCLASS; /* initialize as illegal */
8009 rangebegin = RExC_parse;
8011 value = utf8n_to_uvchr((U8*)RExC_parse,
8012 RExC_end - RExC_parse,
8013 &numlen, UTF8_ALLOW_DEFAULT);
8014 RExC_parse += numlen;
8017 value = UCHARAT(RExC_parse++);
8019 nextvalue = RExC_parse < RExC_end ? UCHARAT(RExC_parse) : 0;
8020 if (value == '[' && POSIXCC(nextvalue))
8021 namedclass = regpposixcc(pRExC_state, value);
8022 else if (value == '\\') {
8024 value = utf8n_to_uvchr((U8*)RExC_parse,
8025 RExC_end - RExC_parse,
8026 &numlen, UTF8_ALLOW_DEFAULT);
8027 RExC_parse += numlen;
8030 value = UCHARAT(RExC_parse++);
8031 /* Some compilers cannot handle switching on 64-bit integer
8032 * values, therefore value cannot be an UV. Yes, this will
8033 * be a problem later if we want switch on Unicode.
8034 * A similar issue a little bit later when switching on
8035 * namedclass. --jhi */
8036 switch ((I32)value) {
8037 case 'w': namedclass = ANYOF_ALNUM; break;
8038 case 'W': namedclass = ANYOF_NALNUM; break;
8039 case 's': namedclass = ANYOF_SPACE; break;
8040 case 'S': namedclass = ANYOF_NSPACE; break;
8041 case 'd': namedclass = ANYOF_DIGIT; break;
8042 case 'D': namedclass = ANYOF_NDIGIT; break;
8043 case 'v': namedclass = ANYOF_VERTWS; break;
8044 case 'V': namedclass = ANYOF_NVERTWS; break;
8045 case 'h': namedclass = ANYOF_HORIZWS; break;
8046 case 'H': namedclass = ANYOF_NHORIZWS; break;
8047 case 'N': /* Handle \N{NAME} in class */
8049 /* We only pay attention to the first char of
8050 multichar strings being returned. I kinda wonder
8051 if this makes sense as it does change the behaviour
8052 from earlier versions, OTOH that behaviour was broken
8054 UV v; /* value is register so we cant & it /grrr */
8055 if (reg_namedseq(pRExC_state, &v, NULL)) {
8065 if (RExC_parse >= RExC_end)
8066 vFAIL2("Empty \\%c{}", (U8)value);
8067 if (*RExC_parse == '{') {
8068 const U8 c = (U8)value;
8069 e = strchr(RExC_parse++, '}');
8071 vFAIL2("Missing right brace on \\%c{}", c);
8072 while (isSPACE(UCHARAT(RExC_parse)))
8074 if (e == RExC_parse)
8075 vFAIL2("Empty \\%c{}", c);
8077 while (isSPACE(UCHARAT(RExC_parse + n - 1)))
8085 if (UCHARAT(RExC_parse) == '^') {
8088 value = value == 'p' ? 'P' : 'p'; /* toggle */
8089 while (isSPACE(UCHARAT(RExC_parse))) {
8094 Perl_sv_catpvf(aTHX_ listsv, "%cutf8::%.*s\n",
8095 (value=='p' ? '+' : '!'), (int)n, RExC_parse);
8098 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
8099 namedclass = ANYOF_MAX; /* no official name, but it's named */
8102 case 'n': value = '\n'; break;
8103 case 'r': value = '\r'; break;
8104 case 't': value = '\t'; break;
8105 case 'f': value = '\f'; break;
8106 case 'b': value = '\b'; break;
8107 case 'e': value = ASCII_TO_NATIVE('\033');break;
8108 case 'a': value = ASCII_TO_NATIVE('\007');break;
8110 RExC_parse--; /* function expects to be pointed at the 'o' */
8112 const char* error_msg;
8113 bool valid = grok_bslash_o(RExC_parse,
8118 RExC_parse += numlen;
8123 if (PL_encoding && value < 0x100) {
8124 goto recode_encoding;
8128 if (*RExC_parse == '{') {
8129 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
8130 | PERL_SCAN_DISALLOW_PREFIX;
8131 char * const e = strchr(RExC_parse++, '}');
8133 vFAIL("Missing right brace on \\x{}");
8135 numlen = e - RExC_parse;
8136 value = grok_hex(RExC_parse, &numlen, &flags, NULL);
8140 I32 flags = PERL_SCAN_DISALLOW_PREFIX;
8142 value = grok_hex(RExC_parse, &numlen, &flags, NULL);
8143 RExC_parse += numlen;
8145 if (PL_encoding && value < 0x100)
8146 goto recode_encoding;
8149 value = grok_bslash_c(*RExC_parse++, SIZE_ONLY);
8151 case '0': case '1': case '2': case '3': case '4':
8152 case '5': case '6': case '7': case '8': case '9':
8156 value = grok_oct(--RExC_parse, &numlen, &flags, NULL);
8157 RExC_parse += numlen;
8158 if (PL_encoding && value < 0x100)
8159 goto recode_encoding;
8164 SV* enc = PL_encoding;
8165 value = reg_recode((const char)(U8)value, &enc);
8166 if (!enc && SIZE_ONLY)
8167 ckWARNreg(RExC_parse,
8168 "Invalid escape in the specified encoding");
8172 if (!SIZE_ONLY && isALPHA(value))
8173 ckWARN2reg(RExC_parse,
8174 "Unrecognized escape \\%c in character class passed through",
8178 } /* end of \blah */
8184 if (namedclass > OOB_NAMEDCLASS) { /* this is a named class \blah */
8186 if (!SIZE_ONLY && !need_class)
8187 ANYOF_CLASS_ZERO(ret);
8191 /* a bad range like a-\d, a-[:digit:] ? */
8195 RExC_parse >= rangebegin ?
8196 RExC_parse - rangebegin : 0;
8197 ckWARN4reg(RExC_parse,
8198 "False [] range \"%*.*s\"",
8201 if (prevvalue < 256) {
8202 ANYOF_BITMAP_SET(ret, prevvalue);
8203 ANYOF_BITMAP_SET(ret, '-');
8206 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
8207 Perl_sv_catpvf(aTHX_ listsv,
8208 "%04"UVxf"\n%04"UVxf"\n", (UV)prevvalue, (UV) '-');
8212 range = 0; /* this was not a true range */
8218 const char *what = NULL;
8221 if (namedclass > OOB_NAMEDCLASS)
8222 optimize_invert = FALSE;
8223 /* Possible truncation here but in some 64-bit environments
8224 * the compiler gets heartburn about switch on 64-bit values.
8225 * A similar issue a little earlier when switching on value.
8227 switch ((I32)namedclass) {
8229 case _C_C_T_(ALNUMC, isALNUMC(value), POSIX_CC_UNI_NAME("Alnum"));
8230 case _C_C_T_(ALPHA, isALPHA(value), POSIX_CC_UNI_NAME("Alpha"));
8231 case _C_C_T_(BLANK, isBLANK(value), POSIX_CC_UNI_NAME("Blank"));
8232 case _C_C_T_(CNTRL, isCNTRL(value), POSIX_CC_UNI_NAME("Cntrl"));
8233 case _C_C_T_(GRAPH, isGRAPH(value), POSIX_CC_UNI_NAME("Graph"));
8234 case _C_C_T_(LOWER, isLOWER(value), POSIX_CC_UNI_NAME("Lower"));
8235 case _C_C_T_(PRINT, isPRINT(value), POSIX_CC_UNI_NAME("Print"));
8236 case _C_C_T_(PSXSPC, isPSXSPC(value), POSIX_CC_UNI_NAME("Space"));
8237 case _C_C_T_(PUNCT, isPUNCT(value), POSIX_CC_UNI_NAME("Punct"));
8238 case _C_C_T_(UPPER, isUPPER(value), POSIX_CC_UNI_NAME("Upper"));
8239 #ifdef BROKEN_UNICODE_CHARCLASS_MAPPINGS
8240 case _C_C_T_(ALNUM, isALNUM(value), "Word");
8241 case _C_C_T_(SPACE, isSPACE(value), "SpacePerl");
8243 case _C_C_T_(SPACE, isSPACE(value), "PerlSpace");
8244 case _C_C_T_(ALNUM, isALNUM(value), "PerlWord");
8246 case _C_C_T_(XDIGIT, isXDIGIT(value), "XDigit");
8247 case _C_C_T_NOLOC_(VERTWS, is_VERTWS_latin1(&value), "VertSpace");
8248 case _C_C_T_NOLOC_(HORIZWS, is_HORIZWS_latin1(&value), "HorizSpace");
8251 ANYOF_CLASS_SET(ret, ANYOF_ASCII);
8254 for (value = 0; value < 128; value++)
8255 ANYOF_BITMAP_SET(ret, value);
8257 for (value = 0; value < 256; value++) {
8259 ANYOF_BITMAP_SET(ret, value);
8268 ANYOF_CLASS_SET(ret, ANYOF_NASCII);
8271 for (value = 128; value < 256; value++)
8272 ANYOF_BITMAP_SET(ret, value);
8274 for (value = 0; value < 256; value++) {
8275 if (!isASCII(value))
8276 ANYOF_BITMAP_SET(ret, value);
8285 ANYOF_CLASS_SET(ret, ANYOF_DIGIT);
8287 /* consecutive digits assumed */
8288 for (value = '0'; value <= '9'; value++)
8289 ANYOF_BITMAP_SET(ret, value);
8292 what = POSIX_CC_UNI_NAME("Digit");
8296 ANYOF_CLASS_SET(ret, ANYOF_NDIGIT);
8298 /* consecutive digits assumed */
8299 for (value = 0; value < '0'; value++)
8300 ANYOF_BITMAP_SET(ret, value);
8301 for (value = '9' + 1; value < 256; value++)
8302 ANYOF_BITMAP_SET(ret, value);
8305 what = POSIX_CC_UNI_NAME("Digit");
8308 /* this is to handle \p and \P */
8311 vFAIL("Invalid [::] class");
8315 /* Strings such as "+utf8::isWord\n" */
8316 Perl_sv_catpvf(aTHX_ listsv, "%cutf8::Is%s\n", yesno, what);
8319 ANYOF_FLAGS(ret) |= ANYOF_CLASS;
8322 } /* end of namedclass \blah */
8325 if (prevvalue > (IV)value) /* b-a */ {
8326 const int w = RExC_parse - rangebegin;
8327 Simple_vFAIL4("Invalid [] range \"%*.*s\"", w, w, rangebegin);
8328 range = 0; /* not a valid range */
8332 prevvalue = value; /* save the beginning of the range */
8333 if (*RExC_parse == '-' && RExC_parse+1 < RExC_end &&
8334 RExC_parse[1] != ']') {
8337 /* a bad range like \w-, [:word:]- ? */
8338 if (namedclass > OOB_NAMEDCLASS) {
8339 if (ckWARN(WARN_REGEXP)) {
8341 RExC_parse >= rangebegin ?
8342 RExC_parse - rangebegin : 0;
8344 "False [] range \"%*.*s\"",
8348 ANYOF_BITMAP_SET(ret, '-');
8350 range = 1; /* yeah, it's a range! */
8351 continue; /* but do it the next time */
8355 /* now is the next time */
8356 /*stored += (value - prevvalue + 1);*/
8358 if (prevvalue < 256) {
8359 const IV ceilvalue = value < 256 ? value : 255;
8362 /* In EBCDIC [\x89-\x91] should include
8363 * the \x8e but [i-j] should not. */
8364 if (literal_endpoint == 2 &&
8365 ((isLOWER(prevvalue) && isLOWER(ceilvalue)) ||
8366 (isUPPER(prevvalue) && isUPPER(ceilvalue))))
8368 if (isLOWER(prevvalue)) {
8369 for (i = prevvalue; i <= ceilvalue; i++)
8370 if (isLOWER(i) && !ANYOF_BITMAP_TEST(ret,i)) {
8372 ANYOF_BITMAP_SET(ret, i);
8375 for (i = prevvalue; i <= ceilvalue; i++)
8376 if (isUPPER(i) && !ANYOF_BITMAP_TEST(ret,i)) {
8378 ANYOF_BITMAP_SET(ret, i);
8384 for (i = prevvalue; i <= ceilvalue; i++) {
8385 if (!ANYOF_BITMAP_TEST(ret,i)) {
8387 ANYOF_BITMAP_SET(ret, i);
8391 if (value > 255 || UTF) {
8392 const UV prevnatvalue = NATIVE_TO_UNI(prevvalue);
8393 const UV natvalue = NATIVE_TO_UNI(value);
8394 stored+=2; /* can't optimize this class */
8395 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
8396 if (prevnatvalue < natvalue) { /* what about > ? */
8397 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\t%04"UVxf"\n",
8398 prevnatvalue, natvalue);
8400 else if (prevnatvalue == natvalue) {
8401 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n", natvalue);
8403 U8 foldbuf[UTF8_MAXBYTES_CASE+1];
8405 const UV f = to_uni_fold(natvalue, foldbuf, &foldlen);
8407 #ifdef EBCDIC /* RD t/uni/fold ff and 6b */
8408 if (RExC_precomp[0] == ':' &&
8409 RExC_precomp[1] == '[' &&
8410 (f == 0xDF || f == 0x92)) {
8411 f = NATIVE_TO_UNI(f);
8414 /* If folding and foldable and a single
8415 * character, insert also the folded version
8416 * to the charclass. */
8418 #ifdef EBCDIC /* RD tunifold ligatures s,t fb05, fb06 */
8419 if ((RExC_precomp[0] == ':' &&
8420 RExC_precomp[1] == '[' &&
8422 (value == 0xFB05 || value == 0xFB06))) ?
8423 foldlen == ((STRLEN)UNISKIP(f) - 1) :
8424 foldlen == (STRLEN)UNISKIP(f) )
8426 if (foldlen == (STRLEN)UNISKIP(f))
8428 Perl_sv_catpvf(aTHX_ listsv,
8431 /* Any multicharacter foldings
8432 * require the following transform:
8433 * [ABCDEF] -> (?:[ABCabcDEFd]|pq|rst)
8434 * where E folds into "pq" and F folds
8435 * into "rst", all other characters
8436 * fold to single characters. We save
8437 * away these multicharacter foldings,
8438 * to be later saved as part of the
8439 * additional "s" data. */
8442 if (!unicode_alternate)
8443 unicode_alternate = newAV();
8444 sv = newSVpvn_utf8((char*)foldbuf, foldlen,
8446 av_push(unicode_alternate, sv);
8450 /* If folding and the value is one of the Greek
8451 * sigmas insert a few more sigmas to make the
8452 * folding rules of the sigmas to work right.
8453 * Note that not all the possible combinations
8454 * are handled here: some of them are handled
8455 * by the standard folding rules, and some of
8456 * them (literal or EXACTF cases) are handled
8457 * during runtime in regexec.c:S_find_byclass(). */
8458 if (value == UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA) {
8459 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
8460 (UV)UNICODE_GREEK_CAPITAL_LETTER_SIGMA);
8461 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
8462 (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA);
8464 else if (value == UNICODE_GREEK_CAPITAL_LETTER_SIGMA)
8465 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
8466 (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA);
8471 literal_endpoint = 0;
8475 range = 0; /* this range (if it was one) is done now */
8479 ANYOF_FLAGS(ret) |= ANYOF_LARGE;
8481 RExC_size += ANYOF_CLASS_ADD_SKIP;
8483 RExC_emit += ANYOF_CLASS_ADD_SKIP;
8489 /****** !SIZE_ONLY AFTER HERE *********/
8491 if( stored == 1 && (value < 128 || (value < 256 && !UTF))
8492 && !( ANYOF_FLAGS(ret) & ( ANYOF_FLAGS_ALL ^ ANYOF_FOLD ) )
8494 /* optimize single char class to an EXACT node
8495 but *only* when its not a UTF/high char */
8496 const char * cur_parse= RExC_parse;
8497 RExC_emit = (regnode *)orig_emit;
8498 RExC_parse = (char *)orig_parse;
8499 ret = reg_node(pRExC_state,
8500 (U8)((ANYOF_FLAGS(ret) & ANYOF_FOLD) ? EXACTF : EXACT));
8501 RExC_parse = (char *)cur_parse;
8502 *STRING(ret)= (char)value;
8504 RExC_emit += STR_SZ(1);
8505 SvREFCNT_dec(listsv);
8508 /* optimize case-insensitive simple patterns (e.g. /[a-z]/i) */
8509 if ( /* If the only flag is folding (plus possibly inversion). */
8510 ((ANYOF_FLAGS(ret) & (ANYOF_FLAGS_ALL ^ ANYOF_INVERT)) == ANYOF_FOLD)
8512 for (value = 0; value < 256; ++value) {
8513 if (ANYOF_BITMAP_TEST(ret, value)) {
8514 UV fold = PL_fold[value];
8517 ANYOF_BITMAP_SET(ret, fold);
8520 ANYOF_FLAGS(ret) &= ~ANYOF_FOLD;
8523 /* optimize inverted simple patterns (e.g. [^a-z]) */
8524 if (optimize_invert &&
8525 /* If the only flag is inversion. */
8526 (ANYOF_FLAGS(ret) & ANYOF_FLAGS_ALL) == ANYOF_INVERT) {
8527 for (value = 0; value < ANYOF_BITMAP_SIZE; ++value)
8528 ANYOF_BITMAP(ret)[value] ^= ANYOF_FLAGS_ALL;
8529 ANYOF_FLAGS(ret) = ANYOF_UNICODE_ALL;
8532 AV * const av = newAV();
8534 /* The 0th element stores the character class description
8535 * in its textual form: used later (regexec.c:Perl_regclass_swash())
8536 * to initialize the appropriate swash (which gets stored in
8537 * the 1st element), and also useful for dumping the regnode.
8538 * The 2nd element stores the multicharacter foldings,
8539 * used later (regexec.c:S_reginclass()). */
8540 av_store(av, 0, listsv);
8541 av_store(av, 1, NULL);
8542 av_store(av, 2, MUTABLE_SV(unicode_alternate));
8543 rv = newRV_noinc(MUTABLE_SV(av));
8544 n = add_data(pRExC_state, 1, "s");
8545 RExC_rxi->data->data[n] = (void*)rv;
8553 /* reg_skipcomment()
8555 Absorbs an /x style # comments from the input stream.
8556 Returns true if there is more text remaining in the stream.
8557 Will set the REG_SEEN_RUN_ON_COMMENT flag if the comment
8558 terminates the pattern without including a newline.
8560 Note its the callers responsibility to ensure that we are
8566 S_reg_skipcomment(pTHX_ RExC_state_t *pRExC_state)
8570 PERL_ARGS_ASSERT_REG_SKIPCOMMENT;
8572 while (RExC_parse < RExC_end)
8573 if (*RExC_parse++ == '\n') {
8578 /* we ran off the end of the pattern without ending
8579 the comment, so we have to add an \n when wrapping */
8580 RExC_seen |= REG_SEEN_RUN_ON_COMMENT;
8588 Advance that parse position, and optionall absorbs
8589 "whitespace" from the inputstream.
8591 Without /x "whitespace" means (?#...) style comments only,
8592 with /x this means (?#...) and # comments and whitespace proper.
8594 Returns the RExC_parse point from BEFORE the scan occurs.
8596 This is the /x friendly way of saying RExC_parse++.
8600 S_nextchar(pTHX_ RExC_state_t *pRExC_state)
8602 char* const retval = RExC_parse++;
8604 PERL_ARGS_ASSERT_NEXTCHAR;
8607 if (*RExC_parse == '(' && RExC_parse[1] == '?' &&
8608 RExC_parse[2] == '#') {
8609 while (*RExC_parse != ')') {
8610 if (RExC_parse == RExC_end)
8611 FAIL("Sequence (?#... not terminated");
8617 if (RExC_flags & RXf_PMf_EXTENDED) {
8618 if (isSPACE(*RExC_parse)) {
8622 else if (*RExC_parse == '#') {
8623 if ( reg_skipcomment( pRExC_state ) )
8632 - reg_node - emit a node
8634 STATIC regnode * /* Location. */
8635 S_reg_node(pTHX_ RExC_state_t *pRExC_state, U8 op)
8638 register regnode *ptr;
8639 regnode * const ret = RExC_emit;
8640 GET_RE_DEBUG_FLAGS_DECL;
8642 PERL_ARGS_ASSERT_REG_NODE;
8645 SIZE_ALIGN(RExC_size);
8649 if (RExC_emit >= RExC_emit_bound)
8650 Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %d", op);
8652 NODE_ALIGN_FILL(ret);
8654 FILL_ADVANCE_NODE(ptr, op);
8655 REH_CALL_COMP_NODE_HOOK(pRExC_state->rx, (ptr) - 1);
8656 #ifdef RE_TRACK_PATTERN_OFFSETS
8657 if (RExC_offsets) { /* MJD */
8658 MJD_OFFSET_DEBUG(("%s:%d: (op %s) %s %"UVuf" (len %"UVuf") (max %"UVuf").\n",
8659 "reg_node", __LINE__,
8661 (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0]
8662 ? "Overwriting end of array!\n" : "OK",
8663 (UV)(RExC_emit - RExC_emit_start),
8664 (UV)(RExC_parse - RExC_start),
8665 (UV)RExC_offsets[0]));
8666 Set_Node_Offset(RExC_emit, RExC_parse + (op == END));
8674 - reganode - emit a node with an argument
8676 STATIC regnode * /* Location. */
8677 S_reganode(pTHX_ RExC_state_t *pRExC_state, U8 op, U32 arg)
8680 register regnode *ptr;
8681 regnode * const ret = RExC_emit;
8682 GET_RE_DEBUG_FLAGS_DECL;
8684 PERL_ARGS_ASSERT_REGANODE;
8687 SIZE_ALIGN(RExC_size);
8692 assert(2==regarglen[op]+1);
8694 Anything larger than this has to allocate the extra amount.
8695 If we changed this to be:
8697 RExC_size += (1 + regarglen[op]);
8699 then it wouldn't matter. Its not clear what side effect
8700 might come from that so its not done so far.
8705 if (RExC_emit >= RExC_emit_bound)
8706 Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %d", op);
8708 NODE_ALIGN_FILL(ret);
8710 FILL_ADVANCE_NODE_ARG(ptr, op, arg);
8711 REH_CALL_COMP_NODE_HOOK(pRExC_state->rx, (ptr) - 2);
8712 #ifdef RE_TRACK_PATTERN_OFFSETS
8713 if (RExC_offsets) { /* MJD */
8714 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
8718 (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0] ?
8719 "Overwriting end of array!\n" : "OK",
8720 (UV)(RExC_emit - RExC_emit_start),
8721 (UV)(RExC_parse - RExC_start),
8722 (UV)RExC_offsets[0]));
8723 Set_Cur_Node_Offset;
8731 - reguni - emit (if appropriate) a Unicode character
8734 S_reguni(pTHX_ const RExC_state_t *pRExC_state, UV uv, char* s)
8738 PERL_ARGS_ASSERT_REGUNI;
8740 return SIZE_ONLY ? UNISKIP(uv) : (uvchr_to_utf8((U8*)s, uv) - (U8*)s);
8744 - reginsert - insert an operator in front of already-emitted operand
8746 * Means relocating the operand.
8749 S_reginsert(pTHX_ RExC_state_t *pRExC_state, U8 op, regnode *opnd, U32 depth)
8752 register regnode *src;
8753 register regnode *dst;
8754 register regnode *place;
8755 const int offset = regarglen[(U8)op];
8756 const int size = NODE_STEP_REGNODE + offset;
8757 GET_RE_DEBUG_FLAGS_DECL;
8759 PERL_ARGS_ASSERT_REGINSERT;
8760 PERL_UNUSED_ARG(depth);
8761 /* (PL_regkind[(U8)op] == CURLY ? EXTRA_STEP_2ARGS : 0); */
8762 DEBUG_PARSE_FMT("inst"," - %s",PL_reg_name[op]);
8771 if (RExC_open_parens) {
8773 /*DEBUG_PARSE_FMT("inst"," - %"IVdf, (IV)RExC_npar);*/
8774 for ( paren=0 ; paren < RExC_npar ; paren++ ) {
8775 if ( RExC_open_parens[paren] >= opnd ) {
8776 /*DEBUG_PARSE_FMT("open"," - %d",size);*/
8777 RExC_open_parens[paren] += size;
8779 /*DEBUG_PARSE_FMT("open"," - %s","ok");*/
8781 if ( RExC_close_parens[paren] >= opnd ) {
8782 /*DEBUG_PARSE_FMT("close"," - %d",size);*/
8783 RExC_close_parens[paren] += size;
8785 /*DEBUG_PARSE_FMT("close"," - %s","ok");*/
8790 while (src > opnd) {
8791 StructCopy(--src, --dst, regnode);
8792 #ifdef RE_TRACK_PATTERN_OFFSETS
8793 if (RExC_offsets) { /* MJD 20010112 */
8794 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s copy %"UVuf" -> %"UVuf" (max %"UVuf").\n",
8798 (UV)(dst - RExC_emit_start) > RExC_offsets[0]
8799 ? "Overwriting end of array!\n" : "OK",
8800 (UV)(src - RExC_emit_start),
8801 (UV)(dst - RExC_emit_start),
8802 (UV)RExC_offsets[0]));
8803 Set_Node_Offset_To_R(dst-RExC_emit_start, Node_Offset(src));
8804 Set_Node_Length_To_R(dst-RExC_emit_start, Node_Length(src));
8810 place = opnd; /* Op node, where operand used to be. */
8811 #ifdef RE_TRACK_PATTERN_OFFSETS
8812 if (RExC_offsets) { /* MJD */
8813 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
8817 (UV)(place - RExC_emit_start) > RExC_offsets[0]
8818 ? "Overwriting end of array!\n" : "OK",
8819 (UV)(place - RExC_emit_start),
8820 (UV)(RExC_parse - RExC_start),
8821 (UV)RExC_offsets[0]));
8822 Set_Node_Offset(place, RExC_parse);
8823 Set_Node_Length(place, 1);
8826 src = NEXTOPER(place);
8827 FILL_ADVANCE_NODE(place, op);
8828 REH_CALL_COMP_NODE_HOOK(pRExC_state->rx, (place) - 1);
8829 Zero(src, offset, regnode);
8833 - regtail - set the next-pointer at the end of a node chain of p to val.
8834 - SEE ALSO: regtail_study
8836 /* TODO: All three parms should be const */
8838 S_regtail(pTHX_ RExC_state_t *pRExC_state, regnode *p, const regnode *val,U32 depth)
8841 register regnode *scan;
8842 GET_RE_DEBUG_FLAGS_DECL;
8844 PERL_ARGS_ASSERT_REGTAIL;
8846 PERL_UNUSED_ARG(depth);
8852 /* Find last node. */
8855 regnode * const temp = regnext(scan);
8857 SV * const mysv=sv_newmortal();
8858 DEBUG_PARSE_MSG((scan==p ? "tail" : ""));
8859 regprop(RExC_rx, mysv, scan);
8860 PerlIO_printf(Perl_debug_log, "~ %s (%d) %s %s\n",
8861 SvPV_nolen_const(mysv), REG_NODE_NUM(scan),
8862 (temp == NULL ? "->" : ""),
8863 (temp == NULL ? PL_reg_name[OP(val)] : "")
8871 if (reg_off_by_arg[OP(scan)]) {
8872 ARG_SET(scan, val - scan);
8875 NEXT_OFF(scan) = val - scan;
8881 - regtail_study - set the next-pointer at the end of a node chain of p to val.
8882 - Look for optimizable sequences at the same time.
8883 - currently only looks for EXACT chains.
8885 This is expermental code. The idea is to use this routine to perform
8886 in place optimizations on branches and groups as they are constructed,
8887 with the long term intention of removing optimization from study_chunk so
8888 that it is purely analytical.
8890 Currently only used when in DEBUG mode. The macro REGTAIL_STUDY() is used
8891 to control which is which.
8894 /* TODO: All four parms should be const */
8897 S_regtail_study(pTHX_ RExC_state_t *pRExC_state, regnode *p, const regnode *val,U32 depth)
8900 register regnode *scan;
8902 #ifdef EXPERIMENTAL_INPLACESCAN
8905 GET_RE_DEBUG_FLAGS_DECL;
8907 PERL_ARGS_ASSERT_REGTAIL_STUDY;
8913 /* Find last node. */
8917 regnode * const temp = regnext(scan);
8918 #ifdef EXPERIMENTAL_INPLACESCAN
8919 if (PL_regkind[OP(scan)] == EXACT)
8920 if (join_exact(pRExC_state,scan,&min,1,val,depth+1))
8928 if( exact == PSEUDO )
8930 else if ( exact != OP(scan) )
8939 SV * const mysv=sv_newmortal();
8940 DEBUG_PARSE_MSG((scan==p ? "tsdy" : ""));
8941 regprop(RExC_rx, mysv, scan);
8942 PerlIO_printf(Perl_debug_log, "~ %s (%d) -> %s\n",
8943 SvPV_nolen_const(mysv),
8945 PL_reg_name[exact]);
8952 SV * const mysv_val=sv_newmortal();
8953 DEBUG_PARSE_MSG("");
8954 regprop(RExC_rx, mysv_val, val);
8955 PerlIO_printf(Perl_debug_log, "~ attach to %s (%"IVdf") offset to %"IVdf"\n",
8956 SvPV_nolen_const(mysv_val),
8957 (IV)REG_NODE_NUM(val),
8961 if (reg_off_by_arg[OP(scan)]) {
8962 ARG_SET(scan, val - scan);
8965 NEXT_OFF(scan) = val - scan;
8973 - regcurly - a little FSA that accepts {\d+,?\d*}
8975 #ifndef PERL_IN_XSUB_RE
8977 Perl_regcurly(register const char *s)
8979 PERL_ARGS_ASSERT_REGCURLY;
8998 - regdump - dump a regexp onto Perl_debug_log in vaguely comprehensible form
9002 S_regdump_extflags(pTHX_ const char *lead, const U32 flags)
9007 for (bit=0; bit<32; bit++) {
9008 if (flags & (1<<bit)) {
9010 PerlIO_printf(Perl_debug_log, "%s",lead);
9011 PerlIO_printf(Perl_debug_log, "%s ",PL_reg_extflags_name[bit]);
9016 PerlIO_printf(Perl_debug_log, "\n");
9018 PerlIO_printf(Perl_debug_log, "%s[none-set]\n",lead);
9024 Perl_regdump(pTHX_ const regexp *r)
9028 SV * const sv = sv_newmortal();
9029 SV *dsv= sv_newmortal();
9031 GET_RE_DEBUG_FLAGS_DECL;
9033 PERL_ARGS_ASSERT_REGDUMP;
9035 (void)dumpuntil(r, ri->program, ri->program + 1, NULL, NULL, sv, 0, 0);
9037 /* Header fields of interest. */
9038 if (r->anchored_substr) {
9039 RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->anchored_substr),
9040 RE_SV_DUMPLEN(r->anchored_substr), 30);
9041 PerlIO_printf(Perl_debug_log,
9042 "anchored %s%s at %"IVdf" ",
9043 s, RE_SV_TAIL(r->anchored_substr),
9044 (IV)r->anchored_offset);
9045 } else if (r->anchored_utf8) {
9046 RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->anchored_utf8),
9047 RE_SV_DUMPLEN(r->anchored_utf8), 30);
9048 PerlIO_printf(Perl_debug_log,
9049 "anchored utf8 %s%s at %"IVdf" ",
9050 s, RE_SV_TAIL(r->anchored_utf8),
9051 (IV)r->anchored_offset);
9053 if (r->float_substr) {
9054 RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->float_substr),
9055 RE_SV_DUMPLEN(r->float_substr), 30);
9056 PerlIO_printf(Perl_debug_log,
9057 "floating %s%s at %"IVdf"..%"UVuf" ",
9058 s, RE_SV_TAIL(r->float_substr),
9059 (IV)r->float_min_offset, (UV)r->float_max_offset);
9060 } else if (r->float_utf8) {
9061 RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->float_utf8),
9062 RE_SV_DUMPLEN(r->float_utf8), 30);
9063 PerlIO_printf(Perl_debug_log,
9064 "floating utf8 %s%s at %"IVdf"..%"UVuf" ",
9065 s, RE_SV_TAIL(r->float_utf8),
9066 (IV)r->float_min_offset, (UV)r->float_max_offset);
9068 if (r->check_substr || r->check_utf8)
9069 PerlIO_printf(Perl_debug_log,
9071 (r->check_substr == r->float_substr
9072 && r->check_utf8 == r->float_utf8
9073 ? "(checking floating" : "(checking anchored"));
9074 if (r->extflags & RXf_NOSCAN)
9075 PerlIO_printf(Perl_debug_log, " noscan");
9076 if (r->extflags & RXf_CHECK_ALL)
9077 PerlIO_printf(Perl_debug_log, " isall");
9078 if (r->check_substr || r->check_utf8)
9079 PerlIO_printf(Perl_debug_log, ") ");
9081 if (ri->regstclass) {
9082 regprop(r, sv, ri->regstclass);
9083 PerlIO_printf(Perl_debug_log, "stclass %s ", SvPVX_const(sv));
9085 if (r->extflags & RXf_ANCH) {
9086 PerlIO_printf(Perl_debug_log, "anchored");
9087 if (r->extflags & RXf_ANCH_BOL)
9088 PerlIO_printf(Perl_debug_log, "(BOL)");
9089 if (r->extflags & RXf_ANCH_MBOL)
9090 PerlIO_printf(Perl_debug_log, "(MBOL)");
9091 if (r->extflags & RXf_ANCH_SBOL)
9092 PerlIO_printf(Perl_debug_log, "(SBOL)");
9093 if (r->extflags & RXf_ANCH_GPOS)
9094 PerlIO_printf(Perl_debug_log, "(GPOS)");
9095 PerlIO_putc(Perl_debug_log, ' ');
9097 if (r->extflags & RXf_GPOS_SEEN)
9098 PerlIO_printf(Perl_debug_log, "GPOS:%"UVuf" ", (UV)r->gofs);
9099 if (r->intflags & PREGf_SKIP)
9100 PerlIO_printf(Perl_debug_log, "plus ");
9101 if (r->intflags & PREGf_IMPLICIT)
9102 PerlIO_printf(Perl_debug_log, "implicit ");
9103 PerlIO_printf(Perl_debug_log, "minlen %"IVdf" ", (IV)r->minlen);
9104 if (r->extflags & RXf_EVAL_SEEN)
9105 PerlIO_printf(Perl_debug_log, "with eval ");
9106 PerlIO_printf(Perl_debug_log, "\n");
9107 DEBUG_FLAGS_r(regdump_extflags("r->extflags: ",r->extflags));
9109 PERL_ARGS_ASSERT_REGDUMP;
9110 PERL_UNUSED_CONTEXT;
9112 #endif /* DEBUGGING */
9116 - regprop - printable representation of opcode
9118 #define EMIT_ANYOF_TEST_SEPARATOR(do_sep,sv,flags) \
9121 Perl_sv_catpvf(aTHX_ sv,"%s][%s",PL_colors[1],PL_colors[0]); \
9122 if (flags & ANYOF_INVERT) \
9123 /*make sure the invert info is in each */ \
9124 sv_catpvs(sv, "^"); \
9130 Perl_regprop(pTHX_ const regexp *prog, SV *sv, const regnode *o)
9135 RXi_GET_DECL(prog,progi);
9136 GET_RE_DEBUG_FLAGS_DECL;
9138 PERL_ARGS_ASSERT_REGPROP;
9142 if (OP(o) > REGNODE_MAX) /* regnode.type is unsigned */
9143 /* It would be nice to FAIL() here, but this may be called from
9144 regexec.c, and it would be hard to supply pRExC_state. */
9145 Perl_croak(aTHX_ "Corrupted regexp opcode %d > %d", (int)OP(o), (int)REGNODE_MAX);
9146 sv_catpv(sv, PL_reg_name[OP(o)]); /* Take off const! */
9148 k = PL_regkind[OP(o)];
9152 /* Using is_utf8_string() (via PERL_PV_UNI_DETECT)
9153 * is a crude hack but it may be the best for now since
9154 * we have no flag "this EXACTish node was UTF-8"
9156 pv_pretty(sv, STRING(o), STR_LEN(o), 60, PL_colors[0], PL_colors[1],
9157 PERL_PV_ESCAPE_UNI_DETECT |
9158 PERL_PV_PRETTY_ELLIPSES |
9159 PERL_PV_PRETTY_LTGT |
9160 PERL_PV_PRETTY_NOCLEAR
9162 } else if (k == TRIE) {
9163 /* print the details of the trie in dumpuntil instead, as
9164 * progi->data isn't available here */
9165 const char op = OP(o);
9166 const U32 n = ARG(o);
9167 const reg_ac_data * const ac = IS_TRIE_AC(op) ?
9168 (reg_ac_data *)progi->data->data[n] :
9170 const reg_trie_data * const trie
9171 = (reg_trie_data*)progi->data->data[!IS_TRIE_AC(op) ? n : ac->trie];
9173 Perl_sv_catpvf(aTHX_ sv, "-%s",PL_reg_name[o->flags]);
9174 DEBUG_TRIE_COMPILE_r(
9175 Perl_sv_catpvf(aTHX_ sv,
9176 "<S:%"UVuf"/%"IVdf" W:%"UVuf" L:%"UVuf"/%"UVuf" C:%"UVuf"/%"UVuf">",
9177 (UV)trie->startstate,
9178 (IV)trie->statecount-1, /* -1 because of the unused 0 element */
9179 (UV)trie->wordcount,
9182 (UV)TRIE_CHARCOUNT(trie),
9183 (UV)trie->uniquecharcount
9186 if ( IS_ANYOF_TRIE(op) || trie->bitmap ) {
9188 int rangestart = -1;
9189 U8* bitmap = IS_ANYOF_TRIE(op) ? (U8*)ANYOF_BITMAP(o) : (U8*)TRIE_BITMAP(trie);
9191 for (i = 0; i <= 256; i++) {
9192 if (i < 256 && BITMAP_TEST(bitmap,i)) {
9193 if (rangestart == -1)
9195 } else if (rangestart != -1) {
9196 if (i <= rangestart + 3)
9197 for (; rangestart < i; rangestart++)
9198 put_byte(sv, rangestart);
9200 put_byte(sv, rangestart);
9202 put_byte(sv, i - 1);
9210 } else if (k == CURLY) {
9211 if (OP(o) == CURLYM || OP(o) == CURLYN || OP(o) == CURLYX)
9212 Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* Parenth number */
9213 Perl_sv_catpvf(aTHX_ sv, " {%d,%d}", ARG1(o), ARG2(o));
9215 else if (k == WHILEM && o->flags) /* Ordinal/of */
9216 Perl_sv_catpvf(aTHX_ sv, "[%d/%d]", o->flags & 0xf, o->flags>>4);
9217 else if (k == REF || k == OPEN || k == CLOSE || k == GROUPP || OP(o)==ACCEPT) {
9218 Perl_sv_catpvf(aTHX_ sv, "%d", (int)ARG(o)); /* Parenth number */
9219 if ( RXp_PAREN_NAMES(prog) ) {
9220 if ( k != REF || OP(o) < NREF) {
9221 AV *list= MUTABLE_AV(progi->data->data[progi->name_list_idx]);
9222 SV **name= av_fetch(list, ARG(o), 0 );
9224 Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
9227 AV *list= MUTABLE_AV(progi->data->data[ progi->name_list_idx ]);
9228 SV *sv_dat= MUTABLE_SV(progi->data->data[ ARG( o ) ]);
9229 I32 *nums=(I32*)SvPVX(sv_dat);
9230 SV **name= av_fetch(list, nums[0], 0 );
9233 for ( n=0; n<SvIVX(sv_dat); n++ ) {
9234 Perl_sv_catpvf(aTHX_ sv, "%s%"IVdf,
9235 (n ? "," : ""), (IV)nums[n]);
9237 Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
9241 } else if (k == GOSUB)
9242 Perl_sv_catpvf(aTHX_ sv, "%d[%+d]", (int)ARG(o),(int)ARG2L(o)); /* Paren and offset */
9243 else if (k == VERB) {
9245 Perl_sv_catpvf(aTHX_ sv, ":%"SVf,
9246 SVfARG((MUTABLE_SV(progi->data->data[ ARG( o ) ]))));
9247 } else if (k == LOGICAL)
9248 Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* 2: embedded, otherwise 1 */
9249 else if (k == FOLDCHAR)
9250 Perl_sv_catpvf(aTHX_ sv, "[0x%"UVXf"]", PTR2UV(ARG(o)) );
9251 else if (k == ANYOF) {
9252 int i, rangestart = -1;
9253 const U8 flags = ANYOF_FLAGS(o);
9256 /* Should be synchronized with * ANYOF_ #xdefines in regcomp.h */
9257 static const char * const anyofs[] = {
9290 if (flags & ANYOF_LOCALE)
9291 sv_catpvs(sv, "{loc}");
9292 if (flags & ANYOF_FOLD)
9293 sv_catpvs(sv, "{i}");
9294 Perl_sv_catpvf(aTHX_ sv, "[%s", PL_colors[0]);
9295 if (flags & ANYOF_INVERT)
9298 /* output what the standard cp 0-255 bitmap matches */
9299 for (i = 0; i <= 256; i++) {
9300 if (i < 256 && ANYOF_BITMAP_TEST(o,i)) {
9301 if (rangestart == -1)
9303 } else if (rangestart != -1) {
9304 if (i <= rangestart + 3)
9305 for (; rangestart < i; rangestart++)
9306 put_byte(sv, rangestart);
9308 put_byte(sv, rangestart);
9310 put_byte(sv, i - 1);
9317 EMIT_ANYOF_TEST_SEPARATOR(do_sep,sv,flags);
9318 /* output any special charclass tests (used mostly under use locale) */
9319 if (o->flags & ANYOF_CLASS)
9320 for (i = 0; i < (int)(sizeof(anyofs)/sizeof(char*)); i++)
9321 if (ANYOF_CLASS_TEST(o,i)) {
9322 sv_catpv(sv, anyofs[i]);
9326 EMIT_ANYOF_TEST_SEPARATOR(do_sep,sv,flags);
9328 /* output information about the unicode matching */
9329 if (flags & ANYOF_UNICODE)
9330 sv_catpvs(sv, "{unicode}");
9331 else if (flags & ANYOF_UNICODE_ALL)
9332 sv_catpvs(sv, "{unicode_all}");
9336 SV * const sw = regclass_swash(prog, o, FALSE, &lv, 0);
9340 U8 s[UTF8_MAXBYTES_CASE+1];
9342 for (i = 0; i <= 256; i++) { /* just the first 256 */
9343 uvchr_to_utf8(s, i);
9345 if (i < 256 && swash_fetch(sw, s, TRUE)) {
9346 if (rangestart == -1)
9348 } else if (rangestart != -1) {
9349 if (i <= rangestart + 3)
9350 for (; rangestart < i; rangestart++) {
9351 const U8 * const e = uvchr_to_utf8(s,rangestart);
9353 for(p = s; p < e; p++)
9357 const U8 *e = uvchr_to_utf8(s,rangestart);
9359 for (p = s; p < e; p++)
9362 e = uvchr_to_utf8(s, i-1);
9363 for (p = s; p < e; p++)
9370 sv_catpvs(sv, "..."); /* et cetera */
9374 char *s = savesvpv(lv);
9375 char * const origs = s;
9377 while (*s && *s != '\n')
9381 const char * const t = ++s;
9399 Perl_sv_catpvf(aTHX_ sv, "%s]", PL_colors[1]);
9401 else if (k == BRANCHJ && (OP(o) == UNLESSM || OP(o) == IFMATCH))
9402 Perl_sv_catpvf(aTHX_ sv, "[%d]", -(o->flags));
9404 PERL_UNUSED_CONTEXT;
9405 PERL_UNUSED_ARG(sv);
9407 PERL_UNUSED_ARG(prog);
9408 #endif /* DEBUGGING */
9412 Perl_re_intuit_string(pTHX_ REGEXP * const r)
9413 { /* Assume that RE_INTUIT is set */
9415 struct regexp *const prog = (struct regexp *)SvANY(r);
9416 GET_RE_DEBUG_FLAGS_DECL;
9418 PERL_ARGS_ASSERT_RE_INTUIT_STRING;
9419 PERL_UNUSED_CONTEXT;
9423 const char * const s = SvPV_nolen_const(prog->check_substr
9424 ? prog->check_substr : prog->check_utf8);
9426 if (!PL_colorset) reginitcolors();
9427 PerlIO_printf(Perl_debug_log,
9428 "%sUsing REx %ssubstr:%s \"%s%.60s%s%s\"\n",
9430 prog->check_substr ? "" : "utf8 ",
9431 PL_colors[5],PL_colors[0],
9434 (strlen(s) > 60 ? "..." : ""));
9437 return prog->check_substr ? prog->check_substr : prog->check_utf8;
9443 handles refcounting and freeing the perl core regexp structure. When
9444 it is necessary to actually free the structure the first thing it
9445 does is call the 'free' method of the regexp_engine associated to to
9446 the regexp, allowing the handling of the void *pprivate; member
9447 first. (This routine is not overridable by extensions, which is why
9448 the extensions free is called first.)
9450 See regdupe and regdupe_internal if you change anything here.
9452 #ifndef PERL_IN_XSUB_RE
9454 Perl_pregfree(pTHX_ REGEXP *r)
9460 Perl_pregfree2(pTHX_ REGEXP *rx)
9463 struct regexp *const r = (struct regexp *)SvANY(rx);
9464 GET_RE_DEBUG_FLAGS_DECL;
9466 PERL_ARGS_ASSERT_PREGFREE2;
9469 ReREFCNT_dec(r->mother_re);
9471 CALLREGFREE_PVT(rx); /* free the private data */
9472 SvREFCNT_dec(RXp_PAREN_NAMES(r));
9475 SvREFCNT_dec(r->anchored_substr);
9476 SvREFCNT_dec(r->anchored_utf8);
9477 SvREFCNT_dec(r->float_substr);
9478 SvREFCNT_dec(r->float_utf8);
9479 Safefree(r->substrs);
9481 RX_MATCH_COPY_FREE(rx);
9482 #ifdef PERL_OLD_COPY_ON_WRITE
9483 SvREFCNT_dec(r->saved_copy);
9490 This is a hacky workaround to the structural issue of match results
9491 being stored in the regexp structure which is in turn stored in
9492 PL_curpm/PL_reg_curpm. The problem is that due to qr// the pattern
9493 could be PL_curpm in multiple contexts, and could require multiple
9494 result sets being associated with the pattern simultaneously, such
9495 as when doing a recursive match with (??{$qr})
9497 The solution is to make a lightweight copy of the regexp structure
9498 when a qr// is returned from the code executed by (??{$qr}) this
9499 lightweight copy doesnt actually own any of its data except for
9500 the starp/end and the actual regexp structure itself.
9506 Perl_reg_temp_copy (pTHX_ REGEXP *ret_x, REGEXP *rx)
9509 struct regexp *const r = (struct regexp *)SvANY(rx);
9510 register const I32 npar = r->nparens+1;
9512 PERL_ARGS_ASSERT_REG_TEMP_COPY;
9515 ret_x = (REGEXP*) newSV_type(SVt_REGEXP);
9516 ret = (struct regexp *)SvANY(ret_x);
9518 (void)ReREFCNT_inc(rx);
9519 /* We can take advantage of the existing "copied buffer" mechanism in SVs
9520 by pointing directly at the buffer, but flagging that the allocated
9521 space in the copy is zero. As we've just done a struct copy, it's now
9522 a case of zero-ing that, rather than copying the current length. */
9523 SvPV_set(ret_x, RX_WRAPPED(rx));
9524 SvFLAGS(ret_x) |= SvFLAGS(rx) & (SVf_POK|SVp_POK|SVf_UTF8);
9525 memcpy(&(ret->xpv_cur), &(r->xpv_cur),
9526 sizeof(regexp) - STRUCT_OFFSET(regexp, xpv_cur));
9527 SvLEN_set(ret_x, 0);
9528 SvSTASH_set(ret_x, NULL);
9529 SvMAGIC_set(ret_x, NULL);
9530 Newx(ret->offs, npar, regexp_paren_pair);
9531 Copy(r->offs, ret->offs, npar, regexp_paren_pair);
9533 Newx(ret->substrs, 1, struct reg_substr_data);
9534 StructCopy(r->substrs, ret->substrs, struct reg_substr_data);
9536 SvREFCNT_inc_void(ret->anchored_substr);
9537 SvREFCNT_inc_void(ret->anchored_utf8);
9538 SvREFCNT_inc_void(ret->float_substr);
9539 SvREFCNT_inc_void(ret->float_utf8);
9541 /* check_substr and check_utf8, if non-NULL, point to either their
9542 anchored or float namesakes, and don't hold a second reference. */
9544 RX_MATCH_COPIED_off(ret_x);
9545 #ifdef PERL_OLD_COPY_ON_WRITE
9546 ret->saved_copy = NULL;
9548 ret->mother_re = rx;
9554 /* regfree_internal()
9556 Free the private data in a regexp. This is overloadable by
9557 extensions. Perl takes care of the regexp structure in pregfree(),
9558 this covers the *pprivate pointer which technically perldoesnt
9559 know about, however of course we have to handle the
9560 regexp_internal structure when no extension is in use.
9562 Note this is called before freeing anything in the regexp
9567 Perl_regfree_internal(pTHX_ REGEXP * const rx)
9570 struct regexp *const r = (struct regexp *)SvANY(rx);
9572 GET_RE_DEBUG_FLAGS_DECL;
9574 PERL_ARGS_ASSERT_REGFREE_INTERNAL;
9580 SV *dsv= sv_newmortal();
9581 RE_PV_QUOTED_DECL(s, RX_UTF8(rx),
9582 dsv, RX_PRECOMP(rx), RX_PRELEN(rx), 60);
9583 PerlIO_printf(Perl_debug_log,"%sFreeing REx:%s %s\n",
9584 PL_colors[4],PL_colors[5],s);
9587 #ifdef RE_TRACK_PATTERN_OFFSETS
9589 Safefree(ri->u.offsets); /* 20010421 MJD */
9592 int n = ri->data->count;
9593 PAD* new_comppad = NULL;
9598 /* If you add a ->what type here, update the comment in regcomp.h */
9599 switch (ri->data->what[n]) {
9604 SvREFCNT_dec(MUTABLE_SV(ri->data->data[n]));
9607 Safefree(ri->data->data[n]);
9610 new_comppad = MUTABLE_AV(ri->data->data[n]);
9613 if (new_comppad == NULL)
9614 Perl_croak(aTHX_ "panic: pregfree comppad");
9615 PAD_SAVE_LOCAL(old_comppad,
9616 /* Watch out for global destruction's random ordering. */
9617 (SvTYPE(new_comppad) == SVt_PVAV) ? new_comppad : NULL
9620 refcnt = OpREFCNT_dec((OP_4tree*)ri->data->data[n]);
9623 op_free((OP_4tree*)ri->data->data[n]);
9625 PAD_RESTORE_LOCAL(old_comppad);
9626 SvREFCNT_dec(MUTABLE_SV(new_comppad));
9632 { /* Aho Corasick add-on structure for a trie node.
9633 Used in stclass optimization only */
9635 reg_ac_data *aho=(reg_ac_data*)ri->data->data[n];
9637 refcount = --aho->refcount;
9640 PerlMemShared_free(aho->states);
9641 PerlMemShared_free(aho->fail);
9642 /* do this last!!!! */
9643 PerlMemShared_free(ri->data->data[n]);
9644 PerlMemShared_free(ri->regstclass);
9650 /* trie structure. */
9652 reg_trie_data *trie=(reg_trie_data*)ri->data->data[n];
9654 refcount = --trie->refcount;
9657 PerlMemShared_free(trie->charmap);
9658 PerlMemShared_free(trie->states);
9659 PerlMemShared_free(trie->trans);
9661 PerlMemShared_free(trie->bitmap);
9663 PerlMemShared_free(trie->jump);
9664 PerlMemShared_free(trie->wordinfo);
9665 /* do this last!!!! */
9666 PerlMemShared_free(ri->data->data[n]);
9671 Perl_croak(aTHX_ "panic: regfree data code '%c'", ri->data->what[n]);
9674 Safefree(ri->data->what);
9681 #define av_dup_inc(s,t) MUTABLE_AV(sv_dup_inc((const SV *)s,t))
9682 #define hv_dup_inc(s,t) MUTABLE_HV(sv_dup_inc((const SV *)s,t))
9683 #define SAVEPVN(p,n) ((p) ? savepvn(p,n) : NULL)
9686 re_dup - duplicate a regexp.
9688 This routine is expected to clone a given regexp structure. It is only
9689 compiled under USE_ITHREADS.
9691 After all of the core data stored in struct regexp is duplicated
9692 the regexp_engine.dupe method is used to copy any private data
9693 stored in the *pprivate pointer. This allows extensions to handle
9694 any duplication it needs to do.
9696 See pregfree() and regfree_internal() if you change anything here.
9698 #if defined(USE_ITHREADS)
9699 #ifndef PERL_IN_XSUB_RE
9701 Perl_re_dup_guts(pTHX_ const REGEXP *sstr, REGEXP *dstr, CLONE_PARAMS *param)
9705 const struct regexp *r = (const struct regexp *)SvANY(sstr);
9706 struct regexp *ret = (struct regexp *)SvANY(dstr);
9708 PERL_ARGS_ASSERT_RE_DUP_GUTS;
9710 npar = r->nparens+1;
9711 Newx(ret->offs, npar, regexp_paren_pair);
9712 Copy(r->offs, ret->offs, npar, regexp_paren_pair);
9714 /* no need to copy these */
9715 Newx(ret->swap, npar, regexp_paren_pair);
9719 /* Do it this way to avoid reading from *r after the StructCopy().
9720 That way, if any of the sv_dup_inc()s dislodge *r from the L1
9721 cache, it doesn't matter. */
9722 const bool anchored = r->check_substr
9723 ? r->check_substr == r->anchored_substr
9724 : r->check_utf8 == r->anchored_utf8;
9725 Newx(ret->substrs, 1, struct reg_substr_data);
9726 StructCopy(r->substrs, ret->substrs, struct reg_substr_data);
9728 ret->anchored_substr = sv_dup_inc(ret->anchored_substr, param);
9729 ret->anchored_utf8 = sv_dup_inc(ret->anchored_utf8, param);
9730 ret->float_substr = sv_dup_inc(ret->float_substr, param);
9731 ret->float_utf8 = sv_dup_inc(ret->float_utf8, param);
9733 /* check_substr and check_utf8, if non-NULL, point to either their
9734 anchored or float namesakes, and don't hold a second reference. */
9736 if (ret->check_substr) {
9738 assert(r->check_utf8 == r->anchored_utf8);
9739 ret->check_substr = ret->anchored_substr;
9740 ret->check_utf8 = ret->anchored_utf8;
9742 assert(r->check_substr == r->float_substr);
9743 assert(r->check_utf8 == r->float_utf8);
9744 ret->check_substr = ret->float_substr;
9745 ret->check_utf8 = ret->float_utf8;
9747 } else if (ret->check_utf8) {
9749 ret->check_utf8 = ret->anchored_utf8;
9751 ret->check_utf8 = ret->float_utf8;
9756 RXp_PAREN_NAMES(ret) = hv_dup_inc(RXp_PAREN_NAMES(ret), param);
9759 RXi_SET(ret,CALLREGDUPE_PVT(dstr,param));
9761 if (RX_MATCH_COPIED(dstr))
9762 ret->subbeg = SAVEPVN(ret->subbeg, ret->sublen);
9765 #ifdef PERL_OLD_COPY_ON_WRITE
9766 ret->saved_copy = NULL;
9769 if (ret->mother_re) {
9770 if (SvPVX_const(dstr) == SvPVX_const(ret->mother_re)) {
9771 /* Our storage points directly to our mother regexp, but that's
9772 1: a buffer in a different thread
9773 2: something we no longer hold a reference on
9774 so we need to copy it locally. */
9775 /* Note we need to sue SvCUR() on our mother_re, because it, in
9776 turn, may well be pointing to its own mother_re. */
9777 SvPV_set(dstr, SAVEPVN(SvPVX_const(ret->mother_re),
9778 SvCUR(ret->mother_re)+1));
9779 SvLEN_set(dstr, SvCUR(ret->mother_re)+1);
9781 ret->mother_re = NULL;
9785 #endif /* PERL_IN_XSUB_RE */
9790 This is the internal complement to regdupe() which is used to copy
9791 the structure pointed to by the *pprivate pointer in the regexp.
9792 This is the core version of the extension overridable cloning hook.
9793 The regexp structure being duplicated will be copied by perl prior
9794 to this and will be provided as the regexp *r argument, however
9795 with the /old/ structures pprivate pointer value. Thus this routine
9796 may override any copying normally done by perl.
9798 It returns a pointer to the new regexp_internal structure.
9802 Perl_regdupe_internal(pTHX_ REGEXP * const rx, CLONE_PARAMS *param)
9805 struct regexp *const r = (struct regexp *)SvANY(rx);
9806 regexp_internal *reti;
9810 PERL_ARGS_ASSERT_REGDUPE_INTERNAL;
9812 npar = r->nparens+1;
9815 Newxc(reti, sizeof(regexp_internal) + len*sizeof(regnode), char, regexp_internal);
9816 Copy(ri->program, reti->program, len+1, regnode);
9819 reti->regstclass = NULL;
9823 const int count = ri->data->count;
9826 Newxc(d, sizeof(struct reg_data) + count*sizeof(void *),
9827 char, struct reg_data);
9828 Newx(d->what, count, U8);
9831 for (i = 0; i < count; i++) {
9832 d->what[i] = ri->data->what[i];
9833 switch (d->what[i]) {
9834 /* legal options are one of: sSfpontTua
9835 see also regcomp.h and pregfree() */
9836 case 'a': /* actually an AV, but the dup function is identical. */
9839 case 'p': /* actually an AV, but the dup function is identical. */
9840 case 'u': /* actually an HV, but the dup function is identical. */
9841 d->data[i] = sv_dup_inc((const SV *)ri->data->data[i], param);
9844 /* This is cheating. */
9845 Newx(d->data[i], 1, struct regnode_charclass_class);
9846 StructCopy(ri->data->data[i], d->data[i],
9847 struct regnode_charclass_class);
9848 reti->regstclass = (regnode*)d->data[i];
9851 /* Compiled op trees are readonly and in shared memory,
9852 and can thus be shared without duplication. */
9854 d->data[i] = (void*)OpREFCNT_inc((OP*)ri->data->data[i]);
9858 /* Trie stclasses are readonly and can thus be shared
9859 * without duplication. We free the stclass in pregfree
9860 * when the corresponding reg_ac_data struct is freed.
9862 reti->regstclass= ri->regstclass;
9866 ((reg_trie_data*)ri->data->data[i])->refcount++;
9870 d->data[i] = ri->data->data[i];
9873 Perl_croak(aTHX_ "panic: re_dup unknown data code '%c'", ri->data->what[i]);
9882 reti->name_list_idx = ri->name_list_idx;
9884 #ifdef RE_TRACK_PATTERN_OFFSETS
9885 if (ri->u.offsets) {
9886 Newx(reti->u.offsets, 2*len+1, U32);
9887 Copy(ri->u.offsets, reti->u.offsets, 2*len+1, U32);
9890 SetProgLen(reti,len);
9896 #endif /* USE_ITHREADS */
9898 #ifndef PERL_IN_XSUB_RE
9901 - regnext - dig the "next" pointer out of a node
9904 Perl_regnext(pTHX_ register regnode *p)
9907 register I32 offset;
9912 if (OP(p) > REGNODE_MAX) { /* regnode.type is unsigned */
9913 Perl_croak(aTHX_ "Corrupted regexp opcode %d > %d", (int)OP(p), (int)REGNODE_MAX);
9916 offset = (reg_off_by_arg[OP(p)] ? ARG(p) : NEXT_OFF(p));
9925 S_re_croak2(pTHX_ const char* pat1,const char* pat2,...)
9928 STRLEN l1 = strlen(pat1);
9929 STRLEN l2 = strlen(pat2);
9932 const char *message;
9934 PERL_ARGS_ASSERT_RE_CROAK2;
9940 Copy(pat1, buf, l1 , char);
9941 Copy(pat2, buf + l1, l2 , char);
9942 buf[l1 + l2] = '\n';
9943 buf[l1 + l2 + 1] = '\0';
9945 /* ANSI variant takes additional second argument */
9946 va_start(args, pat2);
9950 msv = vmess(buf, &args);
9952 message = SvPV_const(msv,l1);
9955 Copy(message, buf, l1 , char);
9956 buf[l1-1] = '\0'; /* Overwrite \n */
9957 Perl_croak(aTHX_ "%s", buf);
9960 /* XXX Here's a total kludge. But we need to re-enter for swash routines. */
9962 #ifndef PERL_IN_XSUB_RE
9964 Perl_save_re_context(pTHX)
9968 struct re_save_state *state;
9970 SAVEVPTR(PL_curcop);
9971 SSGROW(SAVESTACK_ALLOC_FOR_RE_SAVE_STATE + 1);
9973 state = (struct re_save_state *)(PL_savestack + PL_savestack_ix);
9974 PL_savestack_ix += SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
9975 SSPUSHUV(SAVEt_RE_STATE);
9977 Copy(&PL_reg_state, state, 1, struct re_save_state);
9979 PL_reg_start_tmp = 0;
9980 PL_reg_start_tmpl = 0;
9981 PL_reg_oldsaved = NULL;
9982 PL_reg_oldsavedlen = 0;
9984 PL_reg_leftiter = 0;
9985 PL_reg_poscache = NULL;
9986 PL_reg_poscache_size = 0;
9987 #ifdef PERL_OLD_COPY_ON_WRITE
9991 /* Save $1..$n (#18107: UTF-8 s/(\w+)/uc($1)/e); AMS 20021106. */
9993 const REGEXP * const rx = PM_GETRE(PL_curpm);
9996 for (i = 1; i <= RX_NPARENS(rx); i++) {
9997 char digits[TYPE_CHARS(long)];
9998 const STRLEN len = my_snprintf(digits, sizeof(digits), "%lu", (long)i);
9999 GV *const *const gvp
10000 = (GV**)hv_fetch(PL_defstash, digits, len, 0);
10003 GV * const gv = *gvp;
10004 if (SvTYPE(gv) == SVt_PVGV && GvSV(gv))
10014 clear_re(pTHX_ void *r)
10017 ReREFCNT_dec((REGEXP *)r);
10023 S_put_byte(pTHX_ SV *sv, int c)
10025 PERL_ARGS_ASSERT_PUT_BYTE;
10027 /* Our definition of isPRINT() ignores locales, so only bytes that are
10028 not part of UTF-8 are considered printable. I assume that the same
10029 holds for UTF-EBCDIC.
10030 Also, code point 255 is not printable in either (it's E0 in EBCDIC,
10031 which Wikipedia says:
10033 EO, or Eight Ones, is an 8-bit EBCDIC character code represented as all
10034 ones (binary 1111 1111, hexadecimal FF). It is similar, but not
10035 identical, to the ASCII delete (DEL) or rubout control character.
10036 ) So the old condition can be simplified to !isPRINT(c) */
10038 Perl_sv_catpvf(aTHX_ sv, "\\%o", c);
10040 const char string = c;
10041 if (c == '-' || c == ']' || c == '\\' || c == '^')
10042 sv_catpvs(sv, "\\");
10043 sv_catpvn(sv, &string, 1);
10048 #define CLEAR_OPTSTART \
10049 if (optstart) STMT_START { \
10050 DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log, " (%"IVdf" nodes)\n", (IV)(node - optstart))); \
10054 #define DUMPUNTIL(b,e) CLEAR_OPTSTART; node=dumpuntil(r,start,(b),(e),last,sv,indent+1,depth+1);
10056 STATIC const regnode *
10057 S_dumpuntil(pTHX_ const regexp *r, const regnode *start, const regnode *node,
10058 const regnode *last, const regnode *plast,
10059 SV* sv, I32 indent, U32 depth)
10062 register U8 op = PSEUDO; /* Arbitrary non-END op. */
10063 register const regnode *next;
10064 const regnode *optstart= NULL;
10066 RXi_GET_DECL(r,ri);
10067 GET_RE_DEBUG_FLAGS_DECL;
10069 PERL_ARGS_ASSERT_DUMPUNTIL;
10071 #ifdef DEBUG_DUMPUNTIL
10072 PerlIO_printf(Perl_debug_log, "--- %d : %d - %d - %d\n",indent,node-start,
10073 last ? last-start : 0,plast ? plast-start : 0);
10076 if (plast && plast < last)
10079 while (PL_regkind[op] != END && (!last || node < last)) {
10080 /* While that wasn't END last time... */
10083 if (op == CLOSE || op == WHILEM)
10085 next = regnext((regnode *)node);
10088 if (OP(node) == OPTIMIZED) {
10089 if (!optstart && RE_DEBUG_FLAG(RE_DEBUG_COMPILE_OPTIMISE))
10096 regprop(r, sv, node);
10097 PerlIO_printf(Perl_debug_log, "%4"IVdf":%*s%s", (IV)(node - start),
10098 (int)(2*indent + 1), "", SvPVX_const(sv));
10100 if (OP(node) != OPTIMIZED) {
10101 if (next == NULL) /* Next ptr. */
10102 PerlIO_printf(Perl_debug_log, " (0)");
10103 else if (PL_regkind[(U8)op] == BRANCH && PL_regkind[OP(next)] != BRANCH )
10104 PerlIO_printf(Perl_debug_log, " (FAIL)");
10106 PerlIO_printf(Perl_debug_log, " (%"IVdf")", (IV)(next - start));
10107 (void)PerlIO_putc(Perl_debug_log, '\n');
10111 if (PL_regkind[(U8)op] == BRANCHJ) {
10114 register const regnode *nnode = (OP(next) == LONGJMP
10115 ? regnext((regnode *)next)
10117 if (last && nnode > last)
10119 DUMPUNTIL(NEXTOPER(NEXTOPER(node)), nnode);
10122 else if (PL_regkind[(U8)op] == BRANCH) {
10124 DUMPUNTIL(NEXTOPER(node), next);
10126 else if ( PL_regkind[(U8)op] == TRIE ) {
10127 const regnode *this_trie = node;
10128 const char op = OP(node);
10129 const U32 n = ARG(node);
10130 const reg_ac_data * const ac = op>=AHOCORASICK ?
10131 (reg_ac_data *)ri->data->data[n] :
10133 const reg_trie_data * const trie =
10134 (reg_trie_data*)ri->data->data[op<AHOCORASICK ? n : ac->trie];
10136 AV *const trie_words = MUTABLE_AV(ri->data->data[n + TRIE_WORDS_OFFSET]);
10138 const regnode *nextbranch= NULL;
10141 for (word_idx= 0; word_idx < (I32)trie->wordcount; word_idx++) {
10142 SV ** const elem_ptr = av_fetch(trie_words,word_idx,0);
10144 PerlIO_printf(Perl_debug_log, "%*s%s ",
10145 (int)(2*(indent+3)), "",
10146 elem_ptr ? pv_pretty(sv, SvPV_nolen_const(*elem_ptr), SvCUR(*elem_ptr), 60,
10147 PL_colors[0], PL_colors[1],
10148 (SvUTF8(*elem_ptr) ? PERL_PV_ESCAPE_UNI : 0) |
10149 PERL_PV_PRETTY_ELLIPSES |
10150 PERL_PV_PRETTY_LTGT
10155 U16 dist= trie->jump[word_idx+1];
10156 PerlIO_printf(Perl_debug_log, "(%"UVuf")\n",
10157 (UV)((dist ? this_trie + dist : next) - start));
10160 nextbranch= this_trie + trie->jump[0];
10161 DUMPUNTIL(this_trie + dist, nextbranch);
10163 if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
10164 nextbranch= regnext((regnode *)nextbranch);
10166 PerlIO_printf(Perl_debug_log, "\n");
10169 if (last && next > last)
10174 else if ( op == CURLY ) { /* "next" might be very big: optimizer */
10175 DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS,
10176 NEXTOPER(node) + EXTRA_STEP_2ARGS + 1);
10178 else if (PL_regkind[(U8)op] == CURLY && op != CURLYX) {
10180 DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS, next);
10182 else if ( op == PLUS || op == STAR) {
10183 DUMPUNTIL(NEXTOPER(node), NEXTOPER(node) + 1);
10185 else if (op == ANYOF) {
10186 /* arglen 1 + class block */
10187 node += 1 + ((ANYOF_FLAGS(node) & ANYOF_LARGE)
10188 ? ANYOF_CLASS_SKIP : ANYOF_SKIP);
10189 node = NEXTOPER(node);
10191 else if (PL_regkind[(U8)op] == EXACT) {
10192 /* Literal string, where present. */
10193 node += NODE_SZ_STR(node) - 1;
10194 node = NEXTOPER(node);
10197 node = NEXTOPER(node);
10198 node += regarglen[(U8)op];
10200 if (op == CURLYX || op == OPEN)
10204 #ifdef DEBUG_DUMPUNTIL
10205 PerlIO_printf(Perl_debug_log, "--- %d\n", (int)indent);
10210 #endif /* DEBUGGING */
10214 * c-indentation-style: bsd
10215 * c-basic-offset: 4
10216 * indent-tabs-mode: t
10219 * ex: set ts=8 sts=4 sw=4 noet:
projects / perl / modules / re-engine-Hooks.git / blob