5 * "A fair jaw-cracker dwarf-language must be." --Samwise Gamgee
8 /* This file contains functions for compiling a regular expression. See
9 * also regexec.c which funnily enough, contains functions for executing
10 * a regular expression.
12 * This file is also copied at build time to ext/re/re_comp.c, where
13 * it's built with -DPERL_EXT_RE_BUILD -DPERL_EXT_RE_DEBUG -DPERL_EXT.
14 * This causes the main functions to be compiled under new names and with
15 * debugging support added, which makes "use re 'debug'" work.
18 /* NOTE: this is derived from Henry Spencer's regexp code, and should not
19 * confused with the original package (see point 3 below). Thanks, Henry!
22 /* Additional note: this code is very heavily munged from Henry's version
23 * in places. In some spots I've traded clarity for efficiency, so don't
24 * blame Henry for some of the lack of readability.
27 /* The names of the functions have been changed from regcomp and
28 * regexec to pregcomp and pregexec in order to avoid conflicts
29 * with the POSIX routines of the same names.
32 #ifdef PERL_EXT_RE_BUILD
37 * pregcomp and pregexec -- regsub and regerror are not used in perl
39 * Copyright (c) 1986 by University of Toronto.
40 * Written by Henry Spencer. Not derived from licensed software.
42 * Permission is granted to anyone to use this software for any
43 * purpose on any computer system, and to redistribute it freely,
44 * subject to the following restrictions:
46 * 1. The author is not responsible for the consequences of use of
47 * this software, no matter how awful, even if they arise
50 * 2. The origin of this software must not be misrepresented, either
51 * by explicit claim or by omission.
53 * 3. Altered versions must be plainly marked as such, and must not
54 * be misrepresented as being the original software.
57 **** Alterations to Henry's code are...
59 **** Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
60 **** 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 by Larry Wall and others
62 **** You may distribute under the terms of either the GNU General Public
63 **** License or the Artistic License, as specified in the README file.
66 * Beware that some of this code is subtly aware of the way operator
67 * precedence is structured in regular expressions. Serious changes in
68 * regular-expression syntax might require a total rethink.
71 #define PERL_IN_REGCOMP_C
74 #ifndef PERL_IN_XSUB_RE
79 #ifdef PERL_IN_XSUB_RE
90 # if defined(BUGGY_MSC6)
91 /* MSC 6.00A breaks on op/regexp.t test 85 unless we turn this off */
92 # pragma optimize("a",off)
93 /* But MSC 6.00A is happy with 'w', for aliases only across function calls*/
94 # pragma optimize("w",on )
95 # endif /* BUGGY_MSC6 */
102 typedef struct RExC_state_t {
103 U32 flags; /* are we folding, multilining? */
104 char *precomp; /* uncompiled string. */
105 regexp *rx; /* perl core regexp structure */
106 regexp_internal *rxi; /* internal data for regexp object pprivate field */
107 char *start; /* Start of input for compile */
108 char *end; /* End of input for compile */
109 char *parse; /* Input-scan pointer. */
110 I32 whilem_seen; /* number of WHILEM in this expr */
111 regnode *emit_start; /* Start of emitted-code area */
112 regnode *emit; /* Code-emit pointer; ®dummy = don't = compiling */
113 I32 naughty; /* How bad is this pattern? */
114 I32 sawback; /* Did we see \1, ...? */
116 I32 size; /* Code size. */
117 I32 npar; /* Capture buffer count, (OPEN). */
118 I32 cpar; /* Capture buffer count, (CLOSE). */
119 I32 nestroot; /* root parens we are in - used by accept */
123 regnode **open_parens; /* pointers to open parens */
124 regnode **close_parens; /* pointers to close parens */
125 regnode *opend; /* END node in program */
127 HV *charnames; /* cache of named sequences */
128 HV *paren_names; /* Paren names */
130 regnode **recurse; /* Recurse regops */
131 I32 recurse_count; /* Number of recurse regops */
133 char *starttry; /* -Dr: where regtry was called. */
134 #define RExC_starttry (pRExC_state->starttry)
137 const char *lastparse;
139 AV *paren_name_list; /* idx -> name */
140 #define RExC_lastparse (pRExC_state->lastparse)
141 #define RExC_lastnum (pRExC_state->lastnum)
142 #define RExC_paren_name_list (pRExC_state->paren_name_list)
146 #define RExC_flags (pRExC_state->flags)
147 #define RExC_precomp (pRExC_state->precomp)
148 #define RExC_rx (pRExC_state->rx)
149 #define RExC_rxi (pRExC_state->rxi)
150 #define RExC_start (pRExC_state->start)
151 #define RExC_end (pRExC_state->end)
152 #define RExC_parse (pRExC_state->parse)
153 #define RExC_whilem_seen (pRExC_state->whilem_seen)
154 #ifdef RE_TRACK_PATTERN_OFFSETS
155 #define RExC_offsets (pRExC_state->rxi->u.offsets) /* I am not like the others */
157 #define RExC_emit (pRExC_state->emit)
158 #define RExC_emit_start (pRExC_state->emit_start)
159 #define RExC_naughty (pRExC_state->naughty)
160 #define RExC_sawback (pRExC_state->sawback)
161 #define RExC_seen (pRExC_state->seen)
162 #define RExC_size (pRExC_state->size)
163 #define RExC_npar (pRExC_state->npar)
164 #define RExC_nestroot (pRExC_state->nestroot)
165 #define RExC_extralen (pRExC_state->extralen)
166 #define RExC_seen_zerolen (pRExC_state->seen_zerolen)
167 #define RExC_seen_evals (pRExC_state->seen_evals)
168 #define RExC_utf8 (pRExC_state->utf8)
169 #define RExC_charnames (pRExC_state->charnames)
170 #define RExC_open_parens (pRExC_state->open_parens)
171 #define RExC_close_parens (pRExC_state->close_parens)
172 #define RExC_opend (pRExC_state->opend)
173 #define RExC_paren_names (pRExC_state->paren_names)
174 #define RExC_recurse (pRExC_state->recurse)
175 #define RExC_recurse_count (pRExC_state->recurse_count)
178 #define ISMULT1(c) ((c) == '*' || (c) == '+' || (c) == '?')
179 #define ISMULT2(s) ((*s) == '*' || (*s) == '+' || (*s) == '?' || \
180 ((*s) == '{' && regcurly(s)))
183 #undef SPSTART /* dratted cpp namespace... */
186 * Flags to be passed up and down.
188 #define WORST 0 /* Worst case. */
189 #define HASWIDTH 0x1 /* Known to match non-null strings. */
190 #define SIMPLE 0x2 /* Simple enough to be STAR/PLUS operand. */
191 #define SPSTART 0x4 /* Starts with * or +. */
192 #define TRYAGAIN 0x8 /* Weeded out a declaration. */
194 #define REG_NODE_NUM(x) ((x) ? (int)((x)-RExC_emit_start) : -1)
196 /* whether trie related optimizations are enabled */
197 #if PERL_ENABLE_EXTENDED_TRIE_OPTIMISATION
198 #define TRIE_STUDY_OPT
199 #define FULL_TRIE_STUDY
205 #define PBYTE(u8str,paren) ((U8*)(u8str))[(paren) >> 3]
206 #define PBITVAL(paren) (1 << ((paren) & 7))
207 #define PAREN_TEST(u8str,paren) ( PBYTE(u8str,paren) & PBITVAL(paren))
208 #define PAREN_SET(u8str,paren) PBYTE(u8str,paren) |= PBITVAL(paren)
209 #define PAREN_UNSET(u8str,paren) PBYTE(u8str,paren) &= (~PBITVAL(paren))
212 /* About scan_data_t.
214 During optimisation we recurse through the regexp program performing
215 various inplace (keyhole style) optimisations. In addition study_chunk
216 and scan_commit populate this data structure with information about
217 what strings MUST appear in the pattern. We look for the longest
218 string that must appear for at a fixed location, and we look for the
219 longest string that may appear at a floating location. So for instance
224 Both 'FOO' and 'A' are fixed strings. Both 'B' and 'BAR' are floating
225 strings (because they follow a .* construct). study_chunk will identify
226 both FOO and BAR as being the longest fixed and floating strings respectively.
228 The strings can be composites, for instance
232 will result in a composite fixed substring 'foo'.
234 For each string some basic information is maintained:
236 - offset or min_offset
237 This is the position the string must appear at, or not before.
238 It also implicitly (when combined with minlenp) tells us how many
239 character must match before the string we are searching.
240 Likewise when combined with minlenp and the length of the string
241 tells us how many characters must appear after the string we have
245 Only used for floating strings. This is the rightmost point that
246 the string can appear at. Ifset to I32 max it indicates that the
247 string can occur infinitely far to the right.
250 A pointer to the minimum length of the pattern that the string
251 was found inside. This is important as in the case of positive
252 lookahead or positive lookbehind we can have multiple patterns
257 The minimum length of the pattern overall is 3, the minimum length
258 of the lookahead part is 3, but the minimum length of the part that
259 will actually match is 1. So 'FOO's minimum length is 3, but the
260 minimum length for the F is 1. This is important as the minimum length
261 is used to determine offsets in front of and behind the string being
262 looked for. Since strings can be composites this is the length of the
263 pattern at the time it was commited with a scan_commit. Note that
264 the length is calculated by study_chunk, so that the minimum lengths
265 are not known until the full pattern has been compiled, thus the
266 pointer to the value.
270 In the case of lookbehind the string being searched for can be
271 offset past the start point of the final matching string.
272 If this value was just blithely removed from the min_offset it would
273 invalidate some of the calculations for how many chars must match
274 before or after (as they are derived from min_offset and minlen and
275 the length of the string being searched for).
276 When the final pattern is compiled and the data is moved from the
277 scan_data_t structure into the regexp structure the information
278 about lookbehind is factored in, with the information that would
279 have been lost precalculated in the end_shift field for the
282 The fields pos_min and pos_delta are used to store the minimum offset
283 and the delta to the maximum offset at the current point in the pattern.
287 typedef struct scan_data_t {
288 /*I32 len_min; unused */
289 /*I32 len_delta; unused */
293 I32 last_end; /* min value, <0 unless valid. */
296 SV **longest; /* Either &l_fixed, or &l_float. */
297 SV *longest_fixed; /* longest fixed string found in pattern */
298 I32 offset_fixed; /* offset where it starts */
299 I32 *minlen_fixed; /* pointer to the minlen relevent to the string */
300 I32 lookbehind_fixed; /* is the position of the string modfied by LB */
301 SV *longest_float; /* longest floating string found in pattern */
302 I32 offset_float_min; /* earliest point in string it can appear */
303 I32 offset_float_max; /* latest point in string it can appear */
304 I32 *minlen_float; /* pointer to the minlen relevent to the string */
305 I32 lookbehind_float; /* is the position of the string modified by LB */
309 struct regnode_charclass_class *start_class;
313 * Forward declarations for pregcomp()'s friends.
316 static const scan_data_t zero_scan_data =
317 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ,0};
319 #define SF_BEFORE_EOL (SF_BEFORE_SEOL|SF_BEFORE_MEOL)
320 #define SF_BEFORE_SEOL 0x0001
321 #define SF_BEFORE_MEOL 0x0002
322 #define SF_FIX_BEFORE_EOL (SF_FIX_BEFORE_SEOL|SF_FIX_BEFORE_MEOL)
323 #define SF_FL_BEFORE_EOL (SF_FL_BEFORE_SEOL|SF_FL_BEFORE_MEOL)
326 # define SF_FIX_SHIFT_EOL (0+2)
327 # define SF_FL_SHIFT_EOL (0+4)
329 # define SF_FIX_SHIFT_EOL (+2)
330 # define SF_FL_SHIFT_EOL (+4)
333 #define SF_FIX_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FIX_SHIFT_EOL)
334 #define SF_FIX_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FIX_SHIFT_EOL)
336 #define SF_FL_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FL_SHIFT_EOL)
337 #define SF_FL_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FL_SHIFT_EOL) /* 0x20 */
338 #define SF_IS_INF 0x0040
339 #define SF_HAS_PAR 0x0080
340 #define SF_IN_PAR 0x0100
341 #define SF_HAS_EVAL 0x0200
342 #define SCF_DO_SUBSTR 0x0400
343 #define SCF_DO_STCLASS_AND 0x0800
344 #define SCF_DO_STCLASS_OR 0x1000
345 #define SCF_DO_STCLASS (SCF_DO_STCLASS_AND|SCF_DO_STCLASS_OR)
346 #define SCF_WHILEM_VISITED_POS 0x2000
348 #define SCF_TRIE_RESTUDY 0x4000 /* Do restudy? */
349 #define SCF_SEEN_ACCEPT 0x8000
351 #define UTF (RExC_utf8 != 0)
352 #define LOC ((RExC_flags & RXf_PMf_LOCALE) != 0)
353 #define FOLD ((RExC_flags & RXf_PMf_FOLD) != 0)
355 #define OOB_UNICODE 12345678
356 #define OOB_NAMEDCLASS -1
358 #define CHR_SVLEN(sv) (UTF ? sv_len_utf8(sv) : SvCUR(sv))
359 #define CHR_DIST(a,b) (UTF ? utf8_distance(a,b) : a - b)
362 /* length of regex to show in messages that don't mark a position within */
363 #define RegexLengthToShowInErrorMessages 127
366 * If MARKER[12] are adjusted, be sure to adjust the constants at the top
367 * of t/op/regmesg.t, the tests in t/op/re_tests, and those in
368 * op/pragma/warn/regcomp.
370 #define MARKER1 "<-- HERE" /* marker as it appears in the description */
371 #define MARKER2 " <-- HERE " /* marker as it appears within the regex */
373 #define REPORT_LOCATION " in regex; marked by " MARKER1 " in m/%.*s" MARKER2 "%s/"
376 * Calls SAVEDESTRUCTOR_X if needed, then calls Perl_croak with the given
377 * arg. Show regex, up to a maximum length. If it's too long, chop and add
380 #define _FAIL(code) STMT_START { \
381 const char *ellipses = ""; \
382 IV len = RExC_end - RExC_precomp; \
385 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx); \
386 if (len > RegexLengthToShowInErrorMessages) { \
387 /* chop 10 shorter than the max, to ensure meaning of "..." */ \
388 len = RegexLengthToShowInErrorMessages - 10; \
394 #define FAIL(msg) _FAIL( \
395 Perl_croak(aTHX_ "%s in regex m/%.*s%s/", \
396 msg, (int)len, RExC_precomp, ellipses))
398 #define FAIL2(msg,arg) _FAIL( \
399 Perl_croak(aTHX_ msg " in regex m/%.*s%s/", \
400 arg, (int)len, RExC_precomp, ellipses))
403 * Simple_vFAIL -- like FAIL, but marks the current location in the scan
405 #define Simple_vFAIL(m) STMT_START { \
406 const IV offset = RExC_parse - RExC_precomp; \
407 Perl_croak(aTHX_ "%s" REPORT_LOCATION, \
408 m, (int)offset, RExC_precomp, RExC_precomp + offset); \
412 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL()
414 #define vFAIL(m) STMT_START { \
416 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx); \
421 * Like Simple_vFAIL(), but accepts two arguments.
423 #define Simple_vFAIL2(m,a1) STMT_START { \
424 const IV offset = RExC_parse - RExC_precomp; \
425 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, \
426 (int)offset, RExC_precomp, RExC_precomp + offset); \
430 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL2().
432 #define vFAIL2(m,a1) STMT_START { \
434 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx); \
435 Simple_vFAIL2(m, a1); \
440 * Like Simple_vFAIL(), but accepts three arguments.
442 #define Simple_vFAIL3(m, a1, a2) STMT_START { \
443 const IV offset = RExC_parse - RExC_precomp; \
444 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, \
445 (int)offset, RExC_precomp, RExC_precomp + offset); \
449 * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL3().
451 #define vFAIL3(m,a1,a2) STMT_START { \
453 SAVEDESTRUCTOR_X(clear_re,(void*)RExC_rx); \
454 Simple_vFAIL3(m, a1, a2); \
458 * Like Simple_vFAIL(), but accepts four arguments.
460 #define Simple_vFAIL4(m, a1, a2, a3) STMT_START { \
461 const IV offset = RExC_parse - RExC_precomp; \
462 S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, a3, \
463 (int)offset, RExC_precomp, RExC_precomp + offset); \
466 #define vWARN(loc,m) STMT_START { \
467 const IV offset = loc - RExC_precomp; \
468 Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s" REPORT_LOCATION, \
469 m, (int)offset, RExC_precomp, RExC_precomp + offset); \
472 #define vWARNdep(loc,m) STMT_START { \
473 const IV offset = loc - RExC_precomp; \
474 Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_REGEXP), \
475 "%s" REPORT_LOCATION, \
476 m, (int)offset, RExC_precomp, RExC_precomp + offset); \
480 #define vWARN2(loc, m, a1) STMT_START { \
481 const IV offset = loc - RExC_precomp; \
482 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
483 a1, (int)offset, RExC_precomp, RExC_precomp + offset); \
486 #define vWARN3(loc, m, a1, a2) STMT_START { \
487 const IV offset = loc - RExC_precomp; \
488 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
489 a1, a2, (int)offset, RExC_precomp, RExC_precomp + offset); \
492 #define vWARN4(loc, m, a1, a2, a3) STMT_START { \
493 const IV offset = loc - RExC_precomp; \
494 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
495 a1, a2, a3, (int)offset, RExC_precomp, RExC_precomp + offset); \
498 #define vWARN5(loc, m, a1, a2, a3, a4) STMT_START { \
499 const IV offset = loc - RExC_precomp; \
500 Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
501 a1, a2, a3, a4, (int)offset, RExC_precomp, RExC_precomp + offset); \
505 /* Allow for side effects in s */
506 #define REGC(c,s) STMT_START { \
507 if (!SIZE_ONLY) *(s) = (c); else (void)(s); \
510 /* Macros for recording node offsets. 20001227 mjd@plover.com
511 * Nodes are numbered 1, 2, 3, 4. Node #n's position is recorded in
512 * element 2*n-1 of the array. Element #2n holds the byte length node #n.
513 * Element 0 holds the number n.
514 * Position is 1 indexed.
516 #ifndef RE_TRACK_PATTERN_OFFSETS
517 #define Set_Node_Offset_To_R(node,byte)
518 #define Set_Node_Offset(node,byte)
519 #define Set_Cur_Node_Offset
520 #define Set_Node_Length_To_R(node,len)
521 #define Set_Node_Length(node,len)
522 #define Set_Node_Cur_Length(node)
523 #define Node_Offset(n)
524 #define Node_Length(n)
525 #define Set_Node_Offset_Length(node,offset,len)
526 #define ProgLen(ri) ri->u.proglen
527 #define SetProgLen(ri,x) ri->u.proglen = x
529 #define ProgLen(ri) ri->u.offsets[0]
530 #define SetProgLen(ri,x) ri->u.offsets[0] = x
531 #define Set_Node_Offset_To_R(node,byte) STMT_START { \
533 MJD_OFFSET_DEBUG(("** (%d) offset of node %d is %d.\n", \
534 __LINE__, (int)(node), (int)(byte))); \
536 Perl_croak(aTHX_ "value of node is %d in Offset macro", (int)(node)); \
538 RExC_offsets[2*(node)-1] = (byte); \
543 #define Set_Node_Offset(node,byte) \
544 Set_Node_Offset_To_R((node)-RExC_emit_start, (byte)-RExC_start)
545 #define Set_Cur_Node_Offset Set_Node_Offset(RExC_emit, RExC_parse)
547 #define Set_Node_Length_To_R(node,len) STMT_START { \
549 MJD_OFFSET_DEBUG(("** (%d) size of node %d is %d.\n", \
550 __LINE__, (int)(node), (int)(len))); \
552 Perl_croak(aTHX_ "value of node is %d in Length macro", (int)(node)); \
554 RExC_offsets[2*(node)] = (len); \
559 #define Set_Node_Length(node,len) \
560 Set_Node_Length_To_R((node)-RExC_emit_start, len)
561 #define Set_Cur_Node_Length(len) Set_Node_Length(RExC_emit, len)
562 #define Set_Node_Cur_Length(node) \
563 Set_Node_Length(node, RExC_parse - parse_start)
565 /* Get offsets and lengths */
566 #define Node_Offset(n) (RExC_offsets[2*((n)-RExC_emit_start)-1])
567 #define Node_Length(n) (RExC_offsets[2*((n)-RExC_emit_start)])
569 #define Set_Node_Offset_Length(node,offset,len) STMT_START { \
570 Set_Node_Offset_To_R((node)-RExC_emit_start, (offset)); \
571 Set_Node_Length_To_R((node)-RExC_emit_start, (len)); \
575 #if PERL_ENABLE_EXPERIMENTAL_REGEX_OPTIMISATIONS
576 #define EXPERIMENTAL_INPLACESCAN
577 #endif /*RE_TRACK_PATTERN_OFFSETS*/
579 #define DEBUG_STUDYDATA(str,data,depth) \
580 DEBUG_OPTIMISE_MORE_r(if(data){ \
581 PerlIO_printf(Perl_debug_log, \
582 "%*s" str "Pos:%"IVdf"/%"IVdf \
583 " Flags: 0x%"UVXf" Whilem_c: %"IVdf" Lcp: %"IVdf" %s", \
584 (int)(depth)*2, "", \
585 (IV)((data)->pos_min), \
586 (IV)((data)->pos_delta), \
587 (UV)((data)->flags), \
588 (IV)((data)->whilem_c), \
589 (IV)((data)->last_closep ? *((data)->last_closep) : -1), \
590 is_inf ? "INF " : "" \
592 if ((data)->last_found) \
593 PerlIO_printf(Perl_debug_log, \
594 "Last:'%s' %"IVdf":%"IVdf"/%"IVdf" %sFixed:'%s' @ %"IVdf \
595 " %sFloat: '%s' @ %"IVdf"/%"IVdf"", \
596 SvPVX_const((data)->last_found), \
597 (IV)((data)->last_end), \
598 (IV)((data)->last_start_min), \
599 (IV)((data)->last_start_max), \
600 ((data)->longest && \
601 (data)->longest==&((data)->longest_fixed)) ? "*" : "", \
602 SvPVX_const((data)->longest_fixed), \
603 (IV)((data)->offset_fixed), \
604 ((data)->longest && \
605 (data)->longest==&((data)->longest_float)) ? "*" : "", \
606 SvPVX_const((data)->longest_float), \
607 (IV)((data)->offset_float_min), \
608 (IV)((data)->offset_float_max) \
610 PerlIO_printf(Perl_debug_log,"\n"); \
613 static void clear_re(pTHX_ void *r);
615 /* Mark that we cannot extend a found fixed substring at this point.
616 Update the longest found anchored substring and the longest found
617 floating substrings if needed. */
620 S_scan_commit(pTHX_ const RExC_state_t *pRExC_state, scan_data_t *data, I32 *minlenp, int is_inf)
622 const STRLEN l = CHR_SVLEN(data->last_found);
623 const STRLEN old_l = CHR_SVLEN(*data->longest);
624 GET_RE_DEBUG_FLAGS_DECL;
626 if ((l >= old_l) && ((l > old_l) || (data->flags & SF_BEFORE_EOL))) {
627 SvSetMagicSV(*data->longest, data->last_found);
628 if (*data->longest == data->longest_fixed) {
629 data->offset_fixed = l ? data->last_start_min : data->pos_min;
630 if (data->flags & SF_BEFORE_EOL)
632 |= ((data->flags & SF_BEFORE_EOL) << SF_FIX_SHIFT_EOL);
634 data->flags &= ~SF_FIX_BEFORE_EOL;
635 data->minlen_fixed=minlenp;
636 data->lookbehind_fixed=0;
638 else { /* *data->longest == data->longest_float */
639 data->offset_float_min = l ? data->last_start_min : data->pos_min;
640 data->offset_float_max = (l
641 ? data->last_start_max
642 : data->pos_min + data->pos_delta);
643 if (is_inf || (U32)data->offset_float_max > (U32)I32_MAX)
644 data->offset_float_max = I32_MAX;
645 if (data->flags & SF_BEFORE_EOL)
647 |= ((data->flags & SF_BEFORE_EOL) << SF_FL_SHIFT_EOL);
649 data->flags &= ~SF_FL_BEFORE_EOL;
650 data->minlen_float=minlenp;
651 data->lookbehind_float=0;
654 SvCUR_set(data->last_found, 0);
656 SV * const sv = data->last_found;
657 if (SvUTF8(sv) && SvMAGICAL(sv)) {
658 MAGIC * const mg = mg_find(sv, PERL_MAGIC_utf8);
664 data->flags &= ~SF_BEFORE_EOL;
665 DEBUG_STUDYDATA("commit: ",data,0);
668 /* Can match anything (initialization) */
670 S_cl_anything(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
672 ANYOF_CLASS_ZERO(cl);
673 ANYOF_BITMAP_SETALL(cl);
674 cl->flags = ANYOF_EOS|ANYOF_UNICODE_ALL;
676 cl->flags |= ANYOF_LOCALE;
679 /* Can match anything (initialization) */
681 S_cl_is_anything(const struct regnode_charclass_class *cl)
685 for (value = 0; value <= ANYOF_MAX; value += 2)
686 if (ANYOF_CLASS_TEST(cl, value) && ANYOF_CLASS_TEST(cl, value + 1))
688 if (!(cl->flags & ANYOF_UNICODE_ALL))
690 if (!ANYOF_BITMAP_TESTALLSET((const void*)cl))
695 /* Can match anything (initialization) */
697 S_cl_init(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
699 Zero(cl, 1, struct regnode_charclass_class);
701 cl_anything(pRExC_state, cl);
705 S_cl_init_zero(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl)
707 Zero(cl, 1, struct regnode_charclass_class);
709 cl_anything(pRExC_state, cl);
711 cl->flags |= ANYOF_LOCALE;
714 /* 'And' a given class with another one. Can create false positives */
715 /* We assume that cl is not inverted */
717 S_cl_and(struct regnode_charclass_class *cl,
718 const struct regnode_charclass_class *and_with)
721 assert(and_with->type == ANYOF);
722 if (!(and_with->flags & ANYOF_CLASS)
723 && !(cl->flags & ANYOF_CLASS)
724 && (and_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
725 && !(and_with->flags & ANYOF_FOLD)
726 && !(cl->flags & ANYOF_FOLD)) {
729 if (and_with->flags & ANYOF_INVERT)
730 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
731 cl->bitmap[i] &= ~and_with->bitmap[i];
733 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
734 cl->bitmap[i] &= and_with->bitmap[i];
735 } /* XXXX: logic is complicated otherwise, leave it along for a moment. */
736 if (!(and_with->flags & ANYOF_EOS))
737 cl->flags &= ~ANYOF_EOS;
739 if (cl->flags & ANYOF_UNICODE_ALL && and_with->flags & ANYOF_UNICODE &&
740 !(and_with->flags & ANYOF_INVERT)) {
741 cl->flags &= ~ANYOF_UNICODE_ALL;
742 cl->flags |= ANYOF_UNICODE;
743 ARG_SET(cl, ARG(and_with));
745 if (!(and_with->flags & ANYOF_UNICODE_ALL) &&
746 !(and_with->flags & ANYOF_INVERT))
747 cl->flags &= ~ANYOF_UNICODE_ALL;
748 if (!(and_with->flags & (ANYOF_UNICODE|ANYOF_UNICODE_ALL)) &&
749 !(and_with->flags & ANYOF_INVERT))
750 cl->flags &= ~ANYOF_UNICODE;
753 /* 'OR' a given class with another one. Can create false positives */
754 /* We assume that cl is not inverted */
756 S_cl_or(const RExC_state_t *pRExC_state, struct regnode_charclass_class *cl, const struct regnode_charclass_class *or_with)
758 if (or_with->flags & ANYOF_INVERT) {
760 * (B1 | CL1) | (!B2 & !CL2) = (B1 | !B2 & !CL2) | (CL1 | (!B2 & !CL2))
761 * <= (B1 | !B2) | (CL1 | !CL2)
762 * which is wasteful if CL2 is small, but we ignore CL2:
763 * (B1 | CL1) | (!B2 & !CL2) <= (B1 | CL1) | !B2 = (B1 | !B2) | CL1
764 * XXXX Can we handle case-fold? Unclear:
765 * (OK1(i) | OK1(i')) | !(OK1(i) | OK1(i')) =
766 * (OK1(i) | OK1(i')) | (!OK1(i) & !OK1(i'))
768 if ( (or_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
769 && !(or_with->flags & ANYOF_FOLD)
770 && !(cl->flags & ANYOF_FOLD) ) {
773 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
774 cl->bitmap[i] |= ~or_with->bitmap[i];
775 } /* XXXX: logic is complicated otherwise */
777 cl_anything(pRExC_state, cl);
780 /* (B1 | CL1) | (B2 | CL2) = (B1 | B2) | (CL1 | CL2)) */
781 if ( (or_with->flags & ANYOF_LOCALE) == (cl->flags & ANYOF_LOCALE)
782 && (!(or_with->flags & ANYOF_FOLD)
783 || (cl->flags & ANYOF_FOLD)) ) {
786 /* OR char bitmap and class bitmap separately */
787 for (i = 0; i < ANYOF_BITMAP_SIZE; i++)
788 cl->bitmap[i] |= or_with->bitmap[i];
789 if (or_with->flags & ANYOF_CLASS) {
790 for (i = 0; i < ANYOF_CLASSBITMAP_SIZE; i++)
791 cl->classflags[i] |= or_with->classflags[i];
792 cl->flags |= ANYOF_CLASS;
795 else { /* XXXX: logic is complicated, leave it along for a moment. */
796 cl_anything(pRExC_state, cl);
799 if (or_with->flags & ANYOF_EOS)
800 cl->flags |= ANYOF_EOS;
802 if (cl->flags & ANYOF_UNICODE && or_with->flags & ANYOF_UNICODE &&
803 ARG(cl) != ARG(or_with)) {
804 cl->flags |= ANYOF_UNICODE_ALL;
805 cl->flags &= ~ANYOF_UNICODE;
807 if (or_with->flags & ANYOF_UNICODE_ALL) {
808 cl->flags |= ANYOF_UNICODE_ALL;
809 cl->flags &= ~ANYOF_UNICODE;
813 #define TRIE_LIST_ITEM(state,idx) (trie->states[state].trans.list)[ idx ]
814 #define TRIE_LIST_CUR(state) ( TRIE_LIST_ITEM( state, 0 ).forid )
815 #define TRIE_LIST_LEN(state) ( TRIE_LIST_ITEM( state, 0 ).newstate )
816 #define TRIE_LIST_USED(idx) ( trie->states[state].trans.list ? (TRIE_LIST_CUR( idx ) - 1) : 0 )
821 dump_trie(trie,widecharmap,revcharmap)
822 dump_trie_interim_list(trie,widecharmap,revcharmap,next_alloc)
823 dump_trie_interim_table(trie,widecharmap,revcharmap,next_alloc)
825 These routines dump out a trie in a somewhat readable format.
826 The _interim_ variants are used for debugging the interim
827 tables that are used to generate the final compressed
828 representation which is what dump_trie expects.
830 Part of the reason for their existance is to provide a form
831 of documentation as to how the different representations function.
836 Dumps the final compressed table form of the trie to Perl_debug_log.
837 Used for debugging make_trie().
841 S_dump_trie(pTHX_ const struct _reg_trie_data *trie, HV *widecharmap,
842 AV *revcharmap, U32 depth)
845 SV *sv=sv_newmortal();
846 int colwidth= widecharmap ? 6 : 4;
847 GET_RE_DEBUG_FLAGS_DECL;
850 PerlIO_printf( Perl_debug_log, "%*sChar : %-6s%-6s%-4s ",
851 (int)depth * 2 + 2,"",
852 "Match","Base","Ofs" );
854 for( state = 0 ; state < trie->uniquecharcount ; state++ ) {
855 SV ** const tmp = av_fetch( revcharmap, state, 0);
857 PerlIO_printf( Perl_debug_log, "%*s",
859 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
860 PL_colors[0], PL_colors[1],
861 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
862 PERL_PV_ESCAPE_FIRSTCHAR
867 PerlIO_printf( Perl_debug_log, "\n%*sState|-----------------------",
868 (int)depth * 2 + 2,"");
870 for( state = 0 ; state < trie->uniquecharcount ; state++ )
871 PerlIO_printf( Perl_debug_log, "%.*s", colwidth, "--------");
872 PerlIO_printf( Perl_debug_log, "\n");
874 for( state = 1 ; state < trie->statecount ; state++ ) {
875 const U32 base = trie->states[ state ].trans.base;
877 PerlIO_printf( Perl_debug_log, "%*s#%4"UVXf"|", (int)depth * 2 + 2,"", (UV)state);
879 if ( trie->states[ state ].wordnum ) {
880 PerlIO_printf( Perl_debug_log, " W%4X", trie->states[ state ].wordnum );
882 PerlIO_printf( Perl_debug_log, "%6s", "" );
885 PerlIO_printf( Perl_debug_log, " @%4"UVXf" ", (UV)base );
890 while( ( base + ofs < trie->uniquecharcount ) ||
891 ( base + ofs - trie->uniquecharcount < trie->lasttrans
892 && trie->trans[ base + ofs - trie->uniquecharcount ].check != state))
895 PerlIO_printf( Perl_debug_log, "+%2"UVXf"[ ", (UV)ofs);
897 for ( ofs = 0 ; ofs < trie->uniquecharcount ; ofs++ ) {
898 if ( ( base + ofs >= trie->uniquecharcount ) &&
899 ( base + ofs - trie->uniquecharcount < trie->lasttrans ) &&
900 trie->trans[ base + ofs - trie->uniquecharcount ].check == state )
902 PerlIO_printf( Perl_debug_log, "%*"UVXf,
904 (UV)trie->trans[ base + ofs - trie->uniquecharcount ].next );
906 PerlIO_printf( Perl_debug_log, "%*s",colwidth," ." );
910 PerlIO_printf( Perl_debug_log, "]");
913 PerlIO_printf( Perl_debug_log, "\n" );
917 Dumps a fully constructed but uncompressed trie in list form.
918 List tries normally only are used for construction when the number of
919 possible chars (trie->uniquecharcount) is very high.
920 Used for debugging make_trie().
923 S_dump_trie_interim_list(pTHX_ const struct _reg_trie_data *trie,
924 HV *widecharmap, AV *revcharmap, U32 next_alloc,
928 SV *sv=sv_newmortal();
929 int colwidth= widecharmap ? 6 : 4;
930 GET_RE_DEBUG_FLAGS_DECL;
931 /* print out the table precompression. */
932 PerlIO_printf( Perl_debug_log, "%*sState :Word | Transition Data\n%*s%s",
933 (int)depth * 2 + 2,"", (int)depth * 2 + 2,"",
934 "------:-----+-----------------\n" );
936 for( state=1 ; state < next_alloc ; state ++ ) {
939 PerlIO_printf( Perl_debug_log, "%*s %4"UVXf" :",
940 (int)depth * 2 + 2,"", (UV)state );
941 if ( ! trie->states[ state ].wordnum ) {
942 PerlIO_printf( Perl_debug_log, "%5s| ","");
944 PerlIO_printf( Perl_debug_log, "W%4x| ",
945 trie->states[ state ].wordnum
948 for( charid = 1 ; charid <= TRIE_LIST_USED( state ) ; charid++ ) {
949 SV ** const tmp = av_fetch( revcharmap, TRIE_LIST_ITEM(state,charid).forid, 0);
951 PerlIO_printf( Perl_debug_log, "%*s:%3X=%4"UVXf" | ",
953 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
954 PL_colors[0], PL_colors[1],
955 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
956 PERL_PV_ESCAPE_FIRSTCHAR
958 TRIE_LIST_ITEM(state,charid).forid,
959 (UV)TRIE_LIST_ITEM(state,charid).newstate
962 PerlIO_printf(Perl_debug_log, "\n%*s| ",
963 (int)((depth * 2) + 14), "");
966 PerlIO_printf( Perl_debug_log, "\n");
971 Dumps a fully constructed but uncompressed trie in table form.
972 This is the normal DFA style state transition table, with a few
973 twists to facilitate compression later.
974 Used for debugging make_trie().
977 S_dump_trie_interim_table(pTHX_ const struct _reg_trie_data *trie,
978 HV *widecharmap, AV *revcharmap, U32 next_alloc,
983 SV *sv=sv_newmortal();
984 int colwidth= widecharmap ? 6 : 4;
985 GET_RE_DEBUG_FLAGS_DECL;
988 print out the table precompression so that we can do a visual check
989 that they are identical.
992 PerlIO_printf( Perl_debug_log, "%*sChar : ",(int)depth * 2 + 2,"" );
994 for( charid = 0 ; charid < trie->uniquecharcount ; charid++ ) {
995 SV ** const tmp = av_fetch( revcharmap, charid, 0);
997 PerlIO_printf( Perl_debug_log, "%*s",
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
1008 PerlIO_printf( Perl_debug_log, "\n%*sState+-",(int)depth * 2 + 2,"" );
1010 for( charid=0 ; charid < trie->uniquecharcount ; charid++ ) {
1011 PerlIO_printf( Perl_debug_log, "%.*s", colwidth,"--------");
1014 PerlIO_printf( Perl_debug_log, "\n" );
1016 for( state=1 ; state < next_alloc ; state += trie->uniquecharcount ) {
1018 PerlIO_printf( Perl_debug_log, "%*s%4"UVXf" : ",
1019 (int)depth * 2 + 2,"",
1020 (UV)TRIE_NODENUM( state ) );
1022 for( charid = 0 ; charid < trie->uniquecharcount ; charid++ ) {
1023 UV v=(UV)SAFE_TRIE_NODENUM( trie->trans[ state + charid ].next );
1025 PerlIO_printf( Perl_debug_log, "%*"UVXf, colwidth, v );
1027 PerlIO_printf( Perl_debug_log, "%*s", colwidth, "." );
1029 if ( ! trie->states[ TRIE_NODENUM( state ) ].wordnum ) {
1030 PerlIO_printf( Perl_debug_log, " (%4"UVXf")\n", (UV)trie->trans[ state ].check );
1032 PerlIO_printf( Perl_debug_log, " (%4"UVXf") W%4X\n", (UV)trie->trans[ state ].check,
1033 trie->states[ TRIE_NODENUM( state ) ].wordnum );
1040 /* make_trie(startbranch,first,last,tail,word_count,flags,depth)
1041 startbranch: the first branch in the whole branch sequence
1042 first : start branch of sequence of branch-exact nodes.
1043 May be the same as startbranch
1044 last : Thing following the last branch.
1045 May be the same as tail.
1046 tail : item following the branch sequence
1047 count : words in the sequence
1048 flags : currently the OP() type we will be building one of /EXACT(|F|Fl)/
1049 depth : indent depth
1051 Inplace optimizes a sequence of 2 or more Branch-Exact nodes into a TRIE node.
1053 A trie is an N'ary tree where the branches are determined by digital
1054 decomposition of the key. IE, at the root node you look up the 1st character and
1055 follow that branch repeat until you find the end of the branches. Nodes can be
1056 marked as "accepting" meaning they represent a complete word. Eg:
1060 would convert into the following structure. Numbers represent states, letters
1061 following numbers represent valid transitions on the letter from that state, if
1062 the number is in square brackets it represents an accepting state, otherwise it
1063 will be in parenthesis.
1065 +-h->+-e->[3]-+-r->(8)-+-s->[9]
1069 (1) +-i->(6)-+-s->[7]
1071 +-s->(3)-+-h->(4)-+-e->[5]
1073 Accept Word Mapping: 3=>1 (he),5=>2 (she), 7=>3 (his), 9=>4 (hers)
1075 This shows that when matching against the string 'hers' we will begin at state 1
1076 read 'h' and move to state 2, read 'e' and move to state 3 which is accepting,
1077 then read 'r' and go to state 8 followed by 's' which takes us to state 9 which
1078 is also accepting. Thus we know that we can match both 'he' and 'hers' with a
1079 single traverse. We store a mapping from accepting to state to which word was
1080 matched, and then when we have multiple possibilities we try to complete the
1081 rest of the regex in the order in which they occured in the alternation.
1083 The only prior NFA like behaviour that would be changed by the TRIE support is
1084 the silent ignoring of duplicate alternations which are of the form:
1086 / (DUPE|DUPE) X? (?{ ... }) Y /x
1088 Thus EVAL blocks follwing a trie may be called a different number of times with
1089 and without the optimisation. With the optimisations dupes will be silently
1090 ignored. This inconsistant behaviour of EVAL type nodes is well established as
1091 the following demonstrates:
1093 'words'=~/(word|word|word)(?{ print $1 })[xyz]/
1095 which prints out 'word' three times, but
1097 'words'=~/(word|word|word)(?{ print $1 })S/
1099 which doesnt print it out at all. This is due to other optimisations kicking in.
1101 Example of what happens on a structural level:
1103 The regexp /(ac|ad|ab)+/ will produce the folowing debug output:
1105 1: CURLYM[1] {1,32767}(18)
1116 This would be optimizable with startbranch=5, first=5, last=16, tail=16
1117 and should turn into:
1119 1: CURLYM[1] {1,32767}(18)
1121 [Words:3 Chars Stored:6 Unique Chars:4 States:5 NCP:1]
1129 Cases where tail != last would be like /(?foo|bar)baz/:
1139 which would be optimizable with startbranch=1, first=1, last=7, tail=8
1140 and would end up looking like:
1143 [Words:2 Chars Stored:6 Unique Chars:5 States:7 NCP:1]
1150 d = uvuni_to_utf8_flags(d, uv, 0);
1152 is the recommended Unicode-aware way of saying
1157 #define TRIE_STORE_REVCHAR \
1159 SV *tmp = newSVpvs(""); \
1160 if (UTF) SvUTF8_on(tmp); \
1161 Perl_sv_catpvf( aTHX_ tmp, "%c", (int)uvc ); \
1162 av_push( revcharmap, tmp ); \
1165 #define TRIE_READ_CHAR STMT_START { \
1169 if ( foldlen > 0 ) { \
1170 uvc = utf8n_to_uvuni( scan, UTF8_MAXLEN, &len, uniflags ); \
1175 uvc = utf8n_to_uvuni( (const U8*)uc, UTF8_MAXLEN, &len, uniflags);\
1176 uvc = to_uni_fold( uvc, foldbuf, &foldlen ); \
1177 foldlen -= UNISKIP( uvc ); \
1178 scan = foldbuf + UNISKIP( uvc ); \
1181 uvc = utf8n_to_uvuni( (const U8*)uc, UTF8_MAXLEN, &len, uniflags);\
1191 #define TRIE_LIST_PUSH(state,fid,ns) STMT_START { \
1192 if ( TRIE_LIST_CUR( state ) >=TRIE_LIST_LEN( state ) ) { \
1193 U32 ging = TRIE_LIST_LEN( state ) *= 2; \
1194 Renew( trie->states[ state ].trans.list, ging, reg_trie_trans_le ); \
1196 TRIE_LIST_ITEM( state, TRIE_LIST_CUR( state ) ).forid = fid; \
1197 TRIE_LIST_ITEM( state, TRIE_LIST_CUR( state ) ).newstate = ns; \
1198 TRIE_LIST_CUR( state )++; \
1201 #define TRIE_LIST_NEW(state) STMT_START { \
1202 Newxz( trie->states[ state ].trans.list, \
1203 4, reg_trie_trans_le ); \
1204 TRIE_LIST_CUR( state ) = 1; \
1205 TRIE_LIST_LEN( state ) = 4; \
1208 #define TRIE_HANDLE_WORD(state) STMT_START { \
1209 U16 dupe= trie->states[ state ].wordnum; \
1210 regnode * const noper_next = regnext( noper ); \
1212 if (trie->wordlen) \
1213 trie->wordlen[ curword ] = wordlen; \
1215 /* store the word for dumping */ \
1217 if (OP(noper) != NOTHING) \
1218 tmp = newSVpvn(STRING(noper), STR_LEN(noper)); \
1220 tmp = newSVpvn( "", 0 ); \
1221 if ( UTF ) SvUTF8_on( tmp ); \
1222 av_push( trie_words, tmp ); \
1227 if ( noper_next < tail ) { \
1229 trie->jump = (U16 *) PerlMemShared_calloc( word_count + 1, sizeof(U16) ); \
1230 trie->jump[curword] = (U16)(noper_next - convert); \
1232 jumper = noper_next; \
1234 nextbranch= regnext(cur); \
1238 /* So it's a dupe. This means we need to maintain a */\
1239 /* linked-list from the first to the next. */\
1240 /* we only allocate the nextword buffer when there */\
1241 /* a dupe, so first time we have to do the allocation */\
1242 if (!trie->nextword) \
1243 trie->nextword = (U16 *) \
1244 PerlMemShared_calloc( word_count + 1, sizeof(U16)); \
1245 while ( trie->nextword[dupe] ) \
1246 dupe= trie->nextword[dupe]; \
1247 trie->nextword[dupe]= curword; \
1249 /* we haven't inserted this word yet. */ \
1250 trie->states[ state ].wordnum = curword; \
1255 #define TRIE_TRANS_STATE(state,base,ucharcount,charid,special) \
1256 ( ( base + charid >= ucharcount \
1257 && base + charid < ubound \
1258 && state == trie->trans[ base - ucharcount + charid ].check \
1259 && trie->trans[ base - ucharcount + charid ].next ) \
1260 ? trie->trans[ base - ucharcount + charid ].next \
1261 : ( state==1 ? special : 0 ) \
1265 #define MADE_JUMP_TRIE 2
1266 #define MADE_EXACT_TRIE 4
1269 S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *first, regnode *last, regnode *tail, U32 word_count, U32 flags, U32 depth)
1272 /* first pass, loop through and scan words */
1273 reg_trie_data *trie;
1274 HV *widecharmap = NULL;
1275 AV *revcharmap = newAV();
1277 const U32 uniflags = UTF8_ALLOW_DEFAULT;
1282 regnode *jumper = NULL;
1283 regnode *nextbranch = NULL;
1284 regnode *convert = NULL;
1285 /* we just use folder as a flag in utf8 */
1286 const U8 * const folder = ( flags == EXACTF
1288 : ( flags == EXACTFL
1295 const U32 data_slot = add_data( pRExC_state, 4, "tuuu" );
1296 AV *trie_words = NULL;
1297 /* along with revcharmap, this only used during construction but both are
1298 * useful during debugging so we store them in the struct when debugging.
1301 const U32 data_slot = add_data( pRExC_state, 2, "tu" );
1302 STRLEN trie_charcount=0;
1304 SV *re_trie_maxbuff;
1305 GET_RE_DEBUG_FLAGS_DECL;
1307 PERL_UNUSED_ARG(depth);
1310 trie = (reg_trie_data *) PerlMemShared_calloc( 1, sizeof(reg_trie_data) );
1312 trie->startstate = 1;
1313 trie->wordcount = word_count;
1314 RExC_rxi->data->data[ data_slot ] = (void*)trie;
1315 trie->charmap = (U16 *) PerlMemShared_calloc( 256, sizeof(U16) );
1316 if (!(UTF && folder))
1317 trie->bitmap = (char *) PerlMemShared_calloc( ANYOF_BITMAP_SIZE, 1 );
1319 trie_words = newAV();
1322 re_trie_maxbuff = get_sv(RE_TRIE_MAXBUF_NAME, 1);
1323 if (!SvIOK(re_trie_maxbuff)) {
1324 sv_setiv(re_trie_maxbuff, RE_TRIE_MAXBUF_INIT);
1327 PerlIO_printf( Perl_debug_log,
1328 "%*smake_trie start==%d, first==%d, last==%d, tail==%d depth=%d\n",
1329 (int)depth * 2 + 2, "",
1330 REG_NODE_NUM(startbranch),REG_NODE_NUM(first),
1331 REG_NODE_NUM(last), REG_NODE_NUM(tail),
1335 /* Find the node we are going to overwrite */
1336 if ( first == startbranch && OP( last ) != BRANCH ) {
1337 /* whole branch chain */
1340 /* branch sub-chain */
1341 convert = NEXTOPER( first );
1344 /* -- First loop and Setup --
1346 We first traverse the branches and scan each word to determine if it
1347 contains widechars, and how many unique chars there are, this is
1348 important as we have to build a table with at least as many columns as we
1351 We use an array of integers to represent the character codes 0..255
1352 (trie->charmap) and we use a an HV* to store unicode characters. We use the
1353 native representation of the character value as the key and IV's for the
1356 *TODO* If we keep track of how many times each character is used we can
1357 remap the columns so that the table compression later on is more
1358 efficient in terms of memory by ensuring most common value is in the
1359 middle and the least common are on the outside. IMO this would be better
1360 than a most to least common mapping as theres a decent chance the most
1361 common letter will share a node with the least common, meaning the node
1362 will not be compressable. With a middle is most common approach the worst
1363 case is when we have the least common nodes twice.
1367 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1368 regnode * const noper = NEXTOPER( cur );
1369 const U8 *uc = (U8*)STRING( noper );
1370 const U8 * const e = uc + STR_LEN( noper );
1372 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1373 const U8 *scan = (U8*)NULL;
1374 U32 wordlen = 0; /* required init */
1377 if (OP(noper) == NOTHING) {
1382 TRIE_BITMAP_SET(trie,*uc);
1383 if ( folder ) TRIE_BITMAP_SET(trie,folder[ *uc ]);
1385 for ( ; uc < e ; uc += len ) {
1386 TRIE_CHARCOUNT(trie)++;
1390 if ( !trie->charmap[ uvc ] ) {
1391 trie->charmap[ uvc ]=( ++trie->uniquecharcount );
1393 trie->charmap[ folder[ uvc ] ] = trie->charmap[ uvc ];
1399 widecharmap = newHV();
1401 svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 1 );
1404 Perl_croak( aTHX_ "error creating/fetching widecharmap entry for 0x%"UVXf, uvc );
1406 if ( !SvTRUE( *svpp ) ) {
1407 sv_setiv( *svpp, ++trie->uniquecharcount );
1412 if( cur == first ) {
1415 } else if (chars < trie->minlen) {
1417 } else if (chars > trie->maxlen) {
1421 } /* end first pass */
1422 DEBUG_TRIE_COMPILE_r(
1423 PerlIO_printf( Perl_debug_log, "%*sTRIE(%s): W:%d C:%d Uq:%d Min:%d Max:%d\n",
1424 (int)depth * 2 + 2,"",
1425 ( widecharmap ? "UTF8" : "NATIVE" ), (int)word_count,
1426 (int)TRIE_CHARCOUNT(trie), trie->uniquecharcount,
1427 (int)trie->minlen, (int)trie->maxlen )
1429 trie->wordlen = (U32 *) PerlMemShared_calloc( word_count, sizeof(U32) );
1432 We now know what we are dealing with in terms of unique chars and
1433 string sizes so we can calculate how much memory a naive
1434 representation using a flat table will take. If it's over a reasonable
1435 limit (as specified by ${^RE_TRIE_MAXBUF}) we use a more memory
1436 conservative but potentially much slower representation using an array
1439 At the end we convert both representations into the same compressed
1440 form that will be used in regexec.c for matching with. The latter
1441 is a form that cannot be used to construct with but has memory
1442 properties similar to the list form and access properties similar
1443 to the table form making it both suitable for fast searches and
1444 small enough that its feasable to store for the duration of a program.
1446 See the comment in the code where the compressed table is produced
1447 inplace from the flat tabe representation for an explanation of how
1448 the compression works.
1453 if ( (IV)( ( TRIE_CHARCOUNT(trie) + 1 ) * trie->uniquecharcount + 1) > SvIV(re_trie_maxbuff) ) {
1455 Second Pass -- Array Of Lists Representation
1457 Each state will be represented by a list of charid:state records
1458 (reg_trie_trans_le) the first such element holds the CUR and LEN
1459 points of the allocated array. (See defines above).
1461 We build the initial structure using the lists, and then convert
1462 it into the compressed table form which allows faster lookups
1463 (but cant be modified once converted).
1466 STRLEN transcount = 1;
1468 DEBUG_TRIE_COMPILE_MORE_r( PerlIO_printf( Perl_debug_log,
1469 "%*sCompiling trie using list compiler\n",
1470 (int)depth * 2 + 2, ""));
1472 trie->states = (reg_trie_state *)
1473 PerlMemShared_calloc( TRIE_CHARCOUNT(trie) + 2,
1474 sizeof(reg_trie_state) );
1478 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1480 regnode * const noper = NEXTOPER( cur );
1481 U8 *uc = (U8*)STRING( noper );
1482 const U8 * const e = uc + STR_LEN( noper );
1483 U32 state = 1; /* required init */
1484 U16 charid = 0; /* sanity init */
1485 U8 *scan = (U8*)NULL; /* sanity init */
1486 STRLEN foldlen = 0; /* required init */
1487 U32 wordlen = 0; /* required init */
1488 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1490 if (OP(noper) != NOTHING) {
1491 for ( ; uc < e ; uc += len ) {
1496 charid = trie->charmap[ uvc ];
1498 SV** const svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 0);
1502 charid=(U16)SvIV( *svpp );
1505 /* charid is now 0 if we dont know the char read, or nonzero if we do */
1512 if ( !trie->states[ state ].trans.list ) {
1513 TRIE_LIST_NEW( state );
1515 for ( check = 1; check <= TRIE_LIST_USED( state ); check++ ) {
1516 if ( TRIE_LIST_ITEM( state, check ).forid == charid ) {
1517 newstate = TRIE_LIST_ITEM( state, check ).newstate;
1522 newstate = next_alloc++;
1523 TRIE_LIST_PUSH( state, charid, newstate );
1528 Perl_croak( aTHX_ "panic! In trie construction, no char mapping for %"IVdf, uvc );
1532 TRIE_HANDLE_WORD(state);
1534 } /* end second pass */
1536 /* next alloc is the NEXT state to be allocated */
1537 trie->statecount = next_alloc;
1538 trie->states = (reg_trie_state *)
1539 PerlMemShared_realloc( trie->states,
1541 * sizeof(reg_trie_state) );
1543 /* and now dump it out before we compress it */
1544 DEBUG_TRIE_COMPILE_MORE_r(dump_trie_interim_list(trie, widecharmap,
1545 revcharmap, next_alloc,
1549 trie->trans = (reg_trie_trans *)
1550 PerlMemShared_calloc( transcount, sizeof(reg_trie_trans) );
1557 for( state=1 ; state < next_alloc ; state ++ ) {
1561 DEBUG_TRIE_COMPILE_MORE_r(
1562 PerlIO_printf( Perl_debug_log, "tp: %d zp: %d ",tp,zp)
1566 if (trie->states[state].trans.list) {
1567 U16 minid=TRIE_LIST_ITEM( state, 1).forid;
1571 for( idx = 2 ; idx <= TRIE_LIST_USED( state ) ; idx++ ) {
1572 const U16 forid = TRIE_LIST_ITEM( state, idx).forid;
1573 if ( forid < minid ) {
1575 } else if ( forid > maxid ) {
1579 if ( transcount < tp + maxid - minid + 1) {
1581 trie->trans = (reg_trie_trans *)
1582 PerlMemShared_realloc( trie->trans,
1584 * sizeof(reg_trie_trans) );
1585 Zero( trie->trans + (transcount / 2), transcount / 2 , reg_trie_trans );
1587 base = trie->uniquecharcount + tp - minid;
1588 if ( maxid == minid ) {
1590 for ( ; zp < tp ; zp++ ) {
1591 if ( ! trie->trans[ zp ].next ) {
1592 base = trie->uniquecharcount + zp - minid;
1593 trie->trans[ zp ].next = TRIE_LIST_ITEM( state, 1).newstate;
1594 trie->trans[ zp ].check = state;
1600 trie->trans[ tp ].next = TRIE_LIST_ITEM( state, 1).newstate;
1601 trie->trans[ tp ].check = state;
1606 for ( idx=1; idx <= TRIE_LIST_USED( state ) ; idx++ ) {
1607 const U32 tid = base - trie->uniquecharcount + TRIE_LIST_ITEM( state, idx ).forid;
1608 trie->trans[ tid ].next = TRIE_LIST_ITEM( state, idx ).newstate;
1609 trie->trans[ tid ].check = state;
1611 tp += ( maxid - minid + 1 );
1613 Safefree(trie->states[ state ].trans.list);
1616 DEBUG_TRIE_COMPILE_MORE_r(
1617 PerlIO_printf( Perl_debug_log, " base: %d\n",base);
1620 trie->states[ state ].trans.base=base;
1622 trie->lasttrans = tp + 1;
1626 Second Pass -- Flat Table Representation.
1628 we dont use the 0 slot of either trans[] or states[] so we add 1 to each.
1629 We know that we will need Charcount+1 trans at most to store the data
1630 (one row per char at worst case) So we preallocate both structures
1631 assuming worst case.
1633 We then construct the trie using only the .next slots of the entry
1636 We use the .check field of the first entry of the node temporarily to
1637 make compression both faster and easier by keeping track of how many non
1638 zero fields are in the node.
1640 Since trans are numbered from 1 any 0 pointer in the table is a FAIL
1643 There are two terms at use here: state as a TRIE_NODEIDX() which is a
1644 number representing the first entry of the node, and state as a
1645 TRIE_NODENUM() which is the trans number. state 1 is TRIE_NODEIDX(1) and
1646 TRIE_NODENUM(1), state 2 is TRIE_NODEIDX(2) and TRIE_NODENUM(3) if there
1647 are 2 entrys per node. eg:
1655 The table is internally in the right hand, idx form. However as we also
1656 have to deal with the states array which is indexed by nodenum we have to
1657 use TRIE_NODENUM() to convert.
1660 DEBUG_TRIE_COMPILE_MORE_r( PerlIO_printf( Perl_debug_log,
1661 "%*sCompiling trie using table compiler\n",
1662 (int)depth * 2 + 2, ""));
1664 trie->trans = (reg_trie_trans *)
1665 PerlMemShared_calloc( ( TRIE_CHARCOUNT(trie) + 1 )
1666 * trie->uniquecharcount + 1,
1667 sizeof(reg_trie_trans) );
1668 trie->states = (reg_trie_state *)
1669 PerlMemShared_calloc( TRIE_CHARCOUNT(trie) + 2,
1670 sizeof(reg_trie_state) );
1671 next_alloc = trie->uniquecharcount + 1;
1674 for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
1676 regnode * const noper = NEXTOPER( cur );
1677 const U8 *uc = (U8*)STRING( noper );
1678 const U8 * const e = uc + STR_LEN( noper );
1680 U32 state = 1; /* required init */
1682 U16 charid = 0; /* sanity init */
1683 U32 accept_state = 0; /* sanity init */
1684 U8 *scan = (U8*)NULL; /* sanity init */
1686 STRLEN foldlen = 0; /* required init */
1687 U32 wordlen = 0; /* required init */
1688 U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
1690 if ( OP(noper) != NOTHING ) {
1691 for ( ; uc < e ; uc += len ) {
1696 charid = trie->charmap[ uvc ];
1698 SV* const * const svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 0);
1699 charid = svpp ? (U16)SvIV(*svpp) : 0;
1703 if ( !trie->trans[ state + charid ].next ) {
1704 trie->trans[ state + charid ].next = next_alloc;
1705 trie->trans[ state ].check++;
1706 next_alloc += trie->uniquecharcount;
1708 state = trie->trans[ state + charid ].next;
1710 Perl_croak( aTHX_ "panic! In trie construction, no char mapping for %"IVdf, uvc );
1712 /* charid is now 0 if we dont know the char read, or nonzero if we do */
1715 accept_state = TRIE_NODENUM( state );
1716 TRIE_HANDLE_WORD(accept_state);
1718 } /* end second pass */
1720 /* and now dump it out before we compress it */
1721 DEBUG_TRIE_COMPILE_MORE_r(dump_trie_interim_table(trie, widecharmap,
1723 next_alloc, depth+1));
1727 * Inplace compress the table.*
1729 For sparse data sets the table constructed by the trie algorithm will
1730 be mostly 0/FAIL transitions or to put it another way mostly empty.
1731 (Note that leaf nodes will not contain any transitions.)
1733 This algorithm compresses the tables by eliminating most such
1734 transitions, at the cost of a modest bit of extra work during lookup:
1736 - Each states[] entry contains a .base field which indicates the
1737 index in the state[] array wheres its transition data is stored.
1739 - If .base is 0 there are no valid transitions from that node.
1741 - If .base is nonzero then charid is added to it to find an entry in
1744 -If trans[states[state].base+charid].check!=state then the
1745 transition is taken to be a 0/Fail transition. Thus if there are fail
1746 transitions at the front of the node then the .base offset will point
1747 somewhere inside the previous nodes data (or maybe even into a node
1748 even earlier), but the .check field determines if the transition is
1752 The following process inplace converts the table to the compressed
1753 table: We first do not compress the root node 1,and mark its all its
1754 .check pointers as 1 and set its .base pointer as 1 as well. This
1755 allows to do a DFA construction from the compressed table later, and
1756 ensures that any .base pointers we calculate later are greater than
1759 - We set 'pos' to indicate the first entry of the second node.
1761 - We then iterate over the columns of the node, finding the first and
1762 last used entry at l and m. We then copy l..m into pos..(pos+m-l),
1763 and set the .check pointers accordingly, and advance pos
1764 appropriately and repreat for the next node. Note that when we copy
1765 the next pointers we have to convert them from the original
1766 NODEIDX form to NODENUM form as the former is not valid post
1769 - If a node has no transitions used we mark its base as 0 and do not
1770 advance the pos pointer.
1772 - If a node only has one transition we use a second pointer into the
1773 structure to fill in allocated fail transitions from other states.
1774 This pointer is independent of the main pointer and scans forward
1775 looking for null transitions that are allocated to a state. When it
1776 finds one it writes the single transition into the "hole". If the
1777 pointer doesnt find one the single transition is appended as normal.
1779 - Once compressed we can Renew/realloc the structures to release the
1782 See "Table-Compression Methods" in sec 3.9 of the Red Dragon,
1783 specifically Fig 3.47 and the associated pseudocode.
1787 const U32 laststate = TRIE_NODENUM( next_alloc );
1790 trie->statecount = laststate;
1792 for ( state = 1 ; state < laststate ; state++ ) {
1794 const U32 stateidx = TRIE_NODEIDX( state );
1795 const U32 o_used = trie->trans[ stateidx ].check;
1796 U32 used = trie->trans[ stateidx ].check;
1797 trie->trans[ stateidx ].check = 0;
1799 for ( charid = 0 ; used && charid < trie->uniquecharcount ; charid++ ) {
1800 if ( flag || trie->trans[ stateidx + charid ].next ) {
1801 if ( trie->trans[ stateidx + charid ].next ) {
1803 for ( ; zp < pos ; zp++ ) {
1804 if ( ! trie->trans[ zp ].next ) {
1808 trie->states[ state ].trans.base = zp + trie->uniquecharcount - charid ;
1809 trie->trans[ zp ].next = SAFE_TRIE_NODENUM( trie->trans[ stateidx + charid ].next );
1810 trie->trans[ zp ].check = state;
1811 if ( ++zp > pos ) pos = zp;
1818 trie->states[ state ].trans.base = pos + trie->uniquecharcount - charid ;
1820 trie->trans[ pos ].next = SAFE_TRIE_NODENUM( trie->trans[ stateidx + charid ].next );
1821 trie->trans[ pos ].check = state;
1826 trie->lasttrans = pos + 1;
1827 trie->states = (reg_trie_state *)
1828 PerlMemShared_realloc( trie->states, laststate
1829 * sizeof(reg_trie_state) );
1830 DEBUG_TRIE_COMPILE_MORE_r(
1831 PerlIO_printf( Perl_debug_log,
1832 "%*sAlloc: %d Orig: %"IVdf" elements, Final:%"IVdf". Savings of %%%5.2f\n",
1833 (int)depth * 2 + 2,"",
1834 (int)( ( TRIE_CHARCOUNT(trie) + 1 ) * trie->uniquecharcount + 1 ),
1837 ( ( next_alloc - pos ) * 100 ) / (double)next_alloc );
1840 } /* end table compress */
1842 DEBUG_TRIE_COMPILE_MORE_r(
1843 PerlIO_printf(Perl_debug_log, "%*sStatecount:%"UVxf" Lasttrans:%"UVxf"\n",
1844 (int)depth * 2 + 2, "",
1845 (UV)trie->statecount,
1846 (UV)trie->lasttrans)
1848 /* resize the trans array to remove unused space */
1849 trie->trans = (reg_trie_trans *)
1850 PerlMemShared_realloc( trie->trans, trie->lasttrans
1851 * sizeof(reg_trie_trans) );
1853 /* and now dump out the compressed format */
1854 DEBUG_TRIE_COMPILE_r(dump_trie(trie, widecharmap, revcharmap, depth+1));
1856 { /* Modify the program and insert the new TRIE node*/
1857 U8 nodetype =(U8)(flags & 0xFF);
1861 regnode *optimize = NULL;
1862 #ifdef RE_TRACK_PATTERN_OFFSETS
1865 U32 mjd_nodelen = 0;
1866 #endif /* RE_TRACK_PATTERN_OFFSETS */
1867 #endif /* DEBUGGING */
1869 This means we convert either the first branch or the first Exact,
1870 depending on whether the thing following (in 'last') is a branch
1871 or not and whther first is the startbranch (ie is it a sub part of
1872 the alternation or is it the whole thing.)
1873 Assuming its a sub part we conver the EXACT otherwise we convert
1874 the whole branch sequence, including the first.
1876 /* Find the node we are going to overwrite */
1877 if ( first != startbranch || OP( last ) == BRANCH ) {
1878 /* branch sub-chain */
1879 NEXT_OFF( first ) = (U16)(last - first);
1880 #ifdef RE_TRACK_PATTERN_OFFSETS
1882 mjd_offset= Node_Offset((convert));
1883 mjd_nodelen= Node_Length((convert));
1886 /* whole branch chain */
1888 #ifdef RE_TRACK_PATTERN_OFFSETS
1891 const regnode *nop = NEXTOPER( convert );
1892 mjd_offset= Node_Offset((nop));
1893 mjd_nodelen= Node_Length((nop));
1897 PerlIO_printf(Perl_debug_log, "%*sMJD offset:%"UVuf" MJD length:%"UVuf"\n",
1898 (int)depth * 2 + 2, "",
1899 (UV)mjd_offset, (UV)mjd_nodelen)
1902 /* But first we check to see if there is a common prefix we can
1903 split out as an EXACT and put in front of the TRIE node. */
1904 trie->startstate= 1;
1905 if ( trie->bitmap && !widecharmap && !trie->jump ) {
1907 for ( state = 1 ; state < trie->statecount-1 ; state++ ) {
1911 const U32 base = trie->states[ state ].trans.base;
1913 if ( trie->states[state].wordnum )
1916 for ( ofs = 0 ; ofs < trie->uniquecharcount ; ofs++ ) {
1917 if ( ( base + ofs >= trie->uniquecharcount ) &&
1918 ( base + ofs - trie->uniquecharcount < trie->lasttrans ) &&
1919 trie->trans[ base + ofs - trie->uniquecharcount ].check == state )
1921 if ( ++count > 1 ) {
1922 SV **tmp = av_fetch( revcharmap, ofs, 0);
1923 const U8 *ch = (U8*)SvPV_nolen_const( *tmp );
1924 if ( state == 1 ) break;
1926 Zero(trie->bitmap, ANYOF_BITMAP_SIZE, char);
1928 PerlIO_printf(Perl_debug_log,
1929 "%*sNew Start State=%"UVuf" Class: [",
1930 (int)depth * 2 + 2, "",
1933 SV ** const tmp = av_fetch( revcharmap, idx, 0);
1934 const U8 * const ch = (U8*)SvPV_nolen_const( *tmp );
1936 TRIE_BITMAP_SET(trie,*ch);
1938 TRIE_BITMAP_SET(trie, folder[ *ch ]);
1940 PerlIO_printf(Perl_debug_log, (char*)ch)
1944 TRIE_BITMAP_SET(trie,*ch);
1946 TRIE_BITMAP_SET(trie,folder[ *ch ]);
1947 DEBUG_OPTIMISE_r(PerlIO_printf( Perl_debug_log,"%s", ch));
1953 SV **tmp = av_fetch( revcharmap, idx, 0);
1954 char *ch = SvPV_nolen( *tmp );
1956 SV *sv=sv_newmortal();
1957 PerlIO_printf( Perl_debug_log,
1958 "%*sPrefix State: %"UVuf" Idx:%"UVuf" Char='%s'\n",
1959 (int)depth * 2 + 2, "",
1961 pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), 6,
1962 PL_colors[0], PL_colors[1],
1963 (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
1964 PERL_PV_ESCAPE_FIRSTCHAR
1969 OP( convert ) = nodetype;
1970 str=STRING(convert);
1981 DEBUG_OPTIMISE_r(PerlIO_printf( Perl_debug_log,"]\n"));
1987 regnode *n = convert+NODE_SZ_STR(convert);
1988 NEXT_OFF(convert) = NODE_SZ_STR(convert);
1989 trie->startstate = state;
1990 trie->minlen -= (state - 1);
1991 trie->maxlen -= (state - 1);
1993 regnode *fix = convert;
1994 U32 word = trie->wordcount;
1996 Set_Node_Offset_Length(convert, mjd_offset, state - 1);
1997 while( ++fix < n ) {
1998 Set_Node_Offset_Length(fix, 0, 0);
2001 SV ** const tmp = av_fetch( trie_words, word, 0 );
2003 if ( STR_LEN(convert) <= SvCUR(*tmp) )
2004 sv_chop(*tmp, SvPV_nolen(*tmp) + STR_LEN(convert));
2006 sv_chop(*tmp, SvPV_nolen(*tmp) + SvCUR(*tmp));
2013 NEXT_OFF(convert) = (U16)(tail - convert);
2014 DEBUG_r(optimize= n);
2020 if ( trie->maxlen ) {
2021 NEXT_OFF( convert ) = (U16)(tail - convert);
2022 ARG_SET( convert, data_slot );
2023 /* Store the offset to the first unabsorbed branch in
2024 jump[0], which is otherwise unused by the jump logic.
2025 We use this when dumping a trie and during optimisation. */
2027 trie->jump[0] = (U16)(nextbranch - convert);
2030 if ( !trie->states[trie->startstate].wordnum && trie->bitmap &&
2031 ( (char *)jumper - (char *)convert) >= (int)sizeof(struct regnode_charclass) )
2033 OP( convert ) = TRIEC;
2034 Copy(trie->bitmap, ((struct regnode_charclass *)convert)->bitmap, ANYOF_BITMAP_SIZE, char);
2035 PerlMemShared_free(trie->bitmap);
2038 OP( convert ) = TRIE;
2040 /* store the type in the flags */
2041 convert->flags = nodetype;
2045 + regarglen[ OP( convert ) ];
2047 /* XXX We really should free up the resource in trie now,
2048 as we won't use them - (which resources?) dmq */
2050 /* needed for dumping*/
2051 DEBUG_r(if (optimize) {
2052 regnode *opt = convert;
2054 while ( ++opt < optimize) {
2055 Set_Node_Offset_Length(opt,0,0);
2058 Try to clean up some of the debris left after the
2061 while( optimize < jumper ) {
2062 mjd_nodelen += Node_Length((optimize));
2063 OP( optimize ) = OPTIMIZED;
2064 Set_Node_Offset_Length(optimize,0,0);
2067 Set_Node_Offset_Length(convert,mjd_offset,mjd_nodelen);
2069 } /* end node insert */
2070 RExC_rxi->data->data[ data_slot + 1 ] = (void*)widecharmap;
2072 RExC_rxi->data->data[ data_slot + TRIE_WORDS_OFFSET ] = (void*)trie_words;
2073 RExC_rxi->data->data[ data_slot + 3 ] = (void*)revcharmap;
2075 SvREFCNT_dec(revcharmap);
2079 : trie->startstate>1
2085 S_make_trie_failtable(pTHX_ RExC_state_t *pRExC_state, regnode *source, regnode *stclass, U32 depth)
2087 /* The Trie is constructed and compressed now so we can build a fail array now if its needed
2089 This is basically the Aho-Corasick algorithm. Its from exercise 3.31 and 3.32 in the
2090 "Red Dragon" -- Compilers, principles, techniques, and tools. Aho, Sethi, Ullman 1985/88
2093 We find the fail state for each state in the trie, this state is the longest proper
2094 suffix of the current states 'word' that is also a proper prefix of another word in our
2095 trie. State 1 represents the word '' and is the thus the default fail state. This allows
2096 the DFA not to have to restart after its tried and failed a word at a given point, it
2097 simply continues as though it had been matching the other word in the first place.
2099 'abcdgu'=~/abcdefg|cdgu/
2100 When we get to 'd' we are still matching the first word, we would encounter 'g' which would
2101 fail, which would bring use to the state representing 'd' in the second word where we would
2102 try 'g' and succeed, prodceding to match 'cdgu'.
2104 /* add a fail transition */
2105 const U32 trie_offset = ARG(source);
2106 reg_trie_data *trie=(reg_trie_data *)RExC_rxi->data->data[trie_offset];
2108 const U32 ucharcount = trie->uniquecharcount;
2109 const U32 numstates = trie->statecount;
2110 const U32 ubound = trie->lasttrans + ucharcount;
2114 U32 base = trie->states[ 1 ].trans.base;
2117 const U32 data_slot = add_data( pRExC_state, 1, "T" );
2118 GET_RE_DEBUG_FLAGS_DECL;
2120 PERL_UNUSED_ARG(depth);
2124 ARG_SET( stclass, data_slot );
2125 aho = (reg_ac_data *) PerlMemShared_calloc( 1, sizeof(reg_ac_data) );
2126 RExC_rxi->data->data[ data_slot ] = (void*)aho;
2127 aho->trie=trie_offset;
2128 aho->states=(reg_trie_state *)PerlMemShared_malloc( numstates * sizeof(reg_trie_state) );
2129 Copy( trie->states, aho->states, numstates, reg_trie_state );
2130 Newxz( q, numstates, U32);
2131 aho->fail = (U32 *) PerlMemShared_calloc( numstates, sizeof(U32) );
2134 /* initialize fail[0..1] to be 1 so that we always have
2135 a valid final fail state */
2136 fail[ 0 ] = fail[ 1 ] = 1;
2138 for ( charid = 0; charid < ucharcount ; charid++ ) {
2139 const U32 newstate = TRIE_TRANS_STATE( 1, base, ucharcount, charid, 0 );
2141 q[ q_write ] = newstate;
2142 /* set to point at the root */
2143 fail[ q[ q_write++ ] ]=1;
2146 while ( q_read < q_write) {
2147 const U32 cur = q[ q_read++ % numstates ];
2148 base = trie->states[ cur ].trans.base;
2150 for ( charid = 0 ; charid < ucharcount ; charid++ ) {
2151 const U32 ch_state = TRIE_TRANS_STATE( cur, base, ucharcount, charid, 1 );
2153 U32 fail_state = cur;
2156 fail_state = fail[ fail_state ];
2157 fail_base = aho->states[ fail_state ].trans.base;
2158 } while ( !TRIE_TRANS_STATE( fail_state, fail_base, ucharcount, charid, 1 ) );
2160 fail_state = TRIE_TRANS_STATE( fail_state, fail_base, ucharcount, charid, 1 );
2161 fail[ ch_state ] = fail_state;
2162 if ( !aho->states[ ch_state ].wordnum && aho->states[ fail_state ].wordnum )
2164 aho->states[ ch_state ].wordnum = aho->states[ fail_state ].wordnum;
2166 q[ q_write++ % numstates] = ch_state;
2170 /* restore fail[0..1] to 0 so that we "fall out" of the AC loop
2171 when we fail in state 1, this allows us to use the
2172 charclass scan to find a valid start char. This is based on the principle
2173 that theres a good chance the string being searched contains lots of stuff
2174 that cant be a start char.
2176 fail[ 0 ] = fail[ 1 ] = 0;
2177 DEBUG_TRIE_COMPILE_r({
2178 PerlIO_printf(Perl_debug_log,
2179 "%*sStclass Failtable (%"UVuf" states): 0",
2180 (int)(depth * 2), "", (UV)numstates
2182 for( q_read=1; q_read<numstates; q_read++ ) {
2183 PerlIO_printf(Perl_debug_log, ", %"UVuf, (UV)fail[q_read]);
2185 PerlIO_printf(Perl_debug_log, "\n");
2188 /*RExC_seen |= REG_SEEN_TRIEDFA;*/
2193 * There are strange code-generation bugs caused on sparc64 by gcc-2.95.2.
2194 * These need to be revisited when a newer toolchain becomes available.
2196 #if defined(__sparc64__) && defined(__GNUC__)
2197 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
2198 # undef SPARC64_GCC_WORKAROUND
2199 # define SPARC64_GCC_WORKAROUND 1
2203 #define DEBUG_PEEP(str,scan,depth) \
2204 DEBUG_OPTIMISE_r({if (scan){ \
2205 SV * const mysv=sv_newmortal(); \
2206 regnode *Next = regnext(scan); \
2207 regprop(RExC_rx, mysv, scan); \
2208 PerlIO_printf(Perl_debug_log, "%*s" str ">%3d: %s (%d)\n", \
2209 (int)depth*2, "", REG_NODE_NUM(scan), SvPV_nolen_const(mysv),\
2210 Next ? (REG_NODE_NUM(Next)) : 0 ); \
2217 #define JOIN_EXACT(scan,min,flags) \
2218 if (PL_regkind[OP(scan)] == EXACT) \
2219 join_exact(pRExC_state,(scan),(min),(flags),NULL,depth+1)
2222 S_join_exact(pTHX_ RExC_state_t *pRExC_state, regnode *scan, I32 *min, U32 flags,regnode *val, U32 depth) {
2223 /* Merge several consecutive EXACTish nodes into one. */
2224 regnode *n = regnext(scan);
2226 regnode *next = scan + NODE_SZ_STR(scan);
2230 regnode *stop = scan;
2231 GET_RE_DEBUG_FLAGS_DECL;
2233 PERL_UNUSED_ARG(depth);
2235 #ifndef EXPERIMENTAL_INPLACESCAN
2236 PERL_UNUSED_ARG(flags);
2237 PERL_UNUSED_ARG(val);
2239 DEBUG_PEEP("join",scan,depth);
2241 /* Skip NOTHING, merge EXACT*. */
2243 ( PL_regkind[OP(n)] == NOTHING ||
2244 (stringok && (OP(n) == OP(scan))))
2246 && NEXT_OFF(scan) + NEXT_OFF(n) < I16_MAX) {
2248 if (OP(n) == TAIL || n > next)
2250 if (PL_regkind[OP(n)] == NOTHING) {
2251 DEBUG_PEEP("skip:",n,depth);
2252 NEXT_OFF(scan) += NEXT_OFF(n);
2253 next = n + NODE_STEP_REGNODE;
2260 else if (stringok) {
2261 const unsigned int oldl = STR_LEN(scan);
2262 regnode * const nnext = regnext(n);
2264 DEBUG_PEEP("merg",n,depth);
2267 if (oldl + STR_LEN(n) > U8_MAX)
2269 NEXT_OFF(scan) += NEXT_OFF(n);
2270 STR_LEN(scan) += STR_LEN(n);
2271 next = n + NODE_SZ_STR(n);
2272 /* Now we can overwrite *n : */
2273 Move(STRING(n), STRING(scan) + oldl, STR_LEN(n), char);
2281 #ifdef EXPERIMENTAL_INPLACESCAN
2282 if (flags && !NEXT_OFF(n)) {
2283 DEBUG_PEEP("atch", val, depth);
2284 if (reg_off_by_arg[OP(n)]) {
2285 ARG_SET(n, val - n);
2288 NEXT_OFF(n) = val - n;
2295 if (UTF && ( OP(scan) == EXACTF ) && ( STR_LEN(scan) >= 6 ) ) {
2297 Two problematic code points in Unicode casefolding of EXACT nodes:
2299 U+0390 - GREEK SMALL LETTER IOTA WITH DIALYTIKA AND TONOS
2300 U+03B0 - GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS
2306 U+03B9 U+0308 U+0301 0xCE 0xB9 0xCC 0x88 0xCC 0x81
2307 U+03C5 U+0308 U+0301 0xCF 0x85 0xCC 0x88 0xCC 0x81
2309 This means that in case-insensitive matching (or "loose matching",
2310 as Unicode calls it), an EXACTF of length six (the UTF-8 encoded byte
2311 length of the above casefolded versions) can match a target string
2312 of length two (the byte length of UTF-8 encoded U+0390 or U+03B0).
2313 This would rather mess up the minimum length computation.
2315 What we'll do is to look for the tail four bytes, and then peek
2316 at the preceding two bytes to see whether we need to decrease
2317 the minimum length by four (six minus two).
2319 Thanks to the design of UTF-8, there cannot be false matches:
2320 A sequence of valid UTF-8 bytes cannot be a subsequence of
2321 another valid sequence of UTF-8 bytes.
2324 char * const s0 = STRING(scan), *s, *t;
2325 char * const s1 = s0 + STR_LEN(scan) - 1;
2326 char * const s2 = s1 - 4;
2327 #ifdef EBCDIC /* RD tunifold greek 0390 and 03B0 */
2328 const char t0[] = "\xaf\x49\xaf\x42";
2330 const char t0[] = "\xcc\x88\xcc\x81";
2332 const char * const t1 = t0 + 3;
2335 s < s2 && (t = ninstr(s, s1, t0, t1));
2338 if (((U8)t[-1] == 0x68 && (U8)t[-2] == 0xB4) ||
2339 ((U8)t[-1] == 0x46 && (U8)t[-2] == 0xB5))
2341 if (((U8)t[-1] == 0xB9 && (U8)t[-2] == 0xCE) ||
2342 ((U8)t[-1] == 0x85 && (U8)t[-2] == 0xCF))
2350 n = scan + NODE_SZ_STR(scan);
2352 if (PL_regkind[OP(n)] != NOTHING || OP(n) == NOTHING) {
2359 DEBUG_OPTIMISE_r(if (merged){DEBUG_PEEP("finl",scan,depth)});
2363 /* REx optimizer. Converts nodes into quickier variants "in place".
2364 Finds fixed substrings. */
2366 /* Stops at toplevel WHILEM as well as at "last". At end *scanp is set
2367 to the position after last scanned or to NULL. */
2369 #define INIT_AND_WITHP \
2370 assert(!and_withp); \
2371 Newx(and_withp,1,struct regnode_charclass_class); \
2372 SAVEFREEPV(and_withp)
2374 /* this is a chain of data about sub patterns we are processing that
2375 need to be handled seperately/specially in study_chunk. Its so
2376 we can simulate recursion without losing state. */
2378 typedef struct scan_frame {
2379 regnode *last; /* last node to process in this frame */
2380 regnode *next; /* next node to process when last is reached */
2381 struct scan_frame *prev; /*previous frame*/
2382 I32 stop; /* what stopparen do we use */
2386 #define SCAN_COMMIT(s, data, m) scan_commit(s, data, m, is_inf)
2389 S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp,
2390 I32 *minlenp, I32 *deltap,
2395 struct regnode_charclass_class *and_withp,
2396 U32 flags, U32 depth)
2397 /* scanp: Start here (read-write). */
2398 /* deltap: Write maxlen-minlen here. */
2399 /* last: Stop before this one. */
2400 /* data: string data about the pattern */
2401 /* stopparen: treat close N as END */
2402 /* recursed: which subroutines have we recursed into */
2403 /* and_withp: Valid if flags & SCF_DO_STCLASS_OR */
2406 I32 min = 0, pars = 0, code;
2407 regnode *scan = *scanp, *next;
2409 int is_inf = (flags & SCF_DO_SUBSTR) && (data->flags & SF_IS_INF);
2410 int is_inf_internal = 0; /* The studied chunk is infinite */
2411 I32 is_par = OP(scan) == OPEN ? ARG(scan) : 0;
2412 scan_data_t data_fake;
2413 SV *re_trie_maxbuff = NULL;
2414 regnode *first_non_open = scan;
2415 I32 stopmin = I32_MAX;
2416 scan_frame *frame = NULL;
2418 GET_RE_DEBUG_FLAGS_DECL;
2421 StructCopy(&zero_scan_data, &data_fake, scan_data_t);
2425 while (first_non_open && OP(first_non_open) == OPEN)
2426 first_non_open=regnext(first_non_open);
2431 while ( scan && OP(scan) != END && scan < last ){
2432 /* Peephole optimizer: */
2433 DEBUG_STUDYDATA("Peep:", data,depth);
2434 DEBUG_PEEP("Peep",scan,depth);
2435 JOIN_EXACT(scan,&min,0);
2437 /* Follow the next-chain of the current node and optimize
2438 away all the NOTHINGs from it. */
2439 if (OP(scan) != CURLYX) {
2440 const int max = (reg_off_by_arg[OP(scan)]
2442 /* I32 may be smaller than U16 on CRAYs! */
2443 : (I32_MAX < U16_MAX ? I32_MAX : U16_MAX));
2444 int off = (reg_off_by_arg[OP(scan)] ? ARG(scan) : NEXT_OFF(scan));
2448 /* Skip NOTHING and LONGJMP. */
2449 while ((n = regnext(n))
2450 && ((PL_regkind[OP(n)] == NOTHING && (noff = NEXT_OFF(n)))
2451 || ((OP(n) == LONGJMP) && (noff = ARG(n))))
2452 && off + noff < max)
2454 if (reg_off_by_arg[OP(scan)])
2457 NEXT_OFF(scan) = off;
2462 /* The principal pseudo-switch. Cannot be a switch, since we
2463 look into several different things. */
2464 if (OP(scan) == BRANCH || OP(scan) == BRANCHJ
2465 || OP(scan) == IFTHEN) {
2466 next = regnext(scan);
2468 /* demq: the op(next)==code check is to see if we have "branch-branch" AFAICT */
2470 if (OP(next) == code || code == IFTHEN) {
2471 /* NOTE - There is similar code to this block below for handling
2472 TRIE nodes on a re-study. If you change stuff here check there
2474 I32 max1 = 0, min1 = I32_MAX, num = 0;
2475 struct regnode_charclass_class accum;
2476 regnode * const startbranch=scan;
2478 if (flags & SCF_DO_SUBSTR)
2479 SCAN_COMMIT(pRExC_state, data, minlenp); /* Cannot merge strings after this. */
2480 if (flags & SCF_DO_STCLASS)
2481 cl_init_zero(pRExC_state, &accum);
2483 while (OP(scan) == code) {
2484 I32 deltanext, minnext, f = 0, fake;
2485 struct regnode_charclass_class this_class;
2488 data_fake.flags = 0;
2490 data_fake.whilem_c = data->whilem_c;
2491 data_fake.last_closep = data->last_closep;
2494 data_fake.last_closep = &fake;
2496 data_fake.pos_delta = delta;
2497 next = regnext(scan);
2498 scan = NEXTOPER(scan);
2500 scan = NEXTOPER(scan);
2501 if (flags & SCF_DO_STCLASS) {
2502 cl_init(pRExC_state, &this_class);
2503 data_fake.start_class = &this_class;
2504 f = SCF_DO_STCLASS_AND;
2506 if (flags & SCF_WHILEM_VISITED_POS)
2507 f |= SCF_WHILEM_VISITED_POS;
2509 /* we suppose the run is continuous, last=next...*/
2510 minnext = study_chunk(pRExC_state, &scan, minlenp, &deltanext,
2512 stopparen, recursed, NULL, f,depth+1);
2515 if (max1 < minnext + deltanext)
2516 max1 = minnext + deltanext;
2517 if (deltanext == I32_MAX)
2518 is_inf = is_inf_internal = 1;
2520 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
2522 if (data_fake.flags & SCF_SEEN_ACCEPT) {
2523 if ( stopmin > minnext)
2524 stopmin = min + min1;
2525 flags &= ~SCF_DO_SUBSTR;
2527 data->flags |= SCF_SEEN_ACCEPT;
2530 if (data_fake.flags & SF_HAS_EVAL)
2531 data->flags |= SF_HAS_EVAL;
2532 data->whilem_c = data_fake.whilem_c;
2534 if (flags & SCF_DO_STCLASS)
2535 cl_or(pRExC_state, &accum, &this_class);
2537 if (code == IFTHEN && num < 2) /* Empty ELSE branch */
2539 if (flags & SCF_DO_SUBSTR) {
2540 data->pos_min += min1;
2541 data->pos_delta += max1 - min1;
2542 if (max1 != min1 || is_inf)
2543 data->longest = &(data->longest_float);
2546 delta += max1 - min1;
2547 if (flags & SCF_DO_STCLASS_OR) {
2548 cl_or(pRExC_state, data->start_class, &accum);
2550 cl_and(data->start_class, and_withp);
2551 flags &= ~SCF_DO_STCLASS;
2554 else if (flags & SCF_DO_STCLASS_AND) {
2556 cl_and(data->start_class, &accum);
2557 flags &= ~SCF_DO_STCLASS;
2560 /* Switch to OR mode: cache the old value of
2561 * data->start_class */
2563 StructCopy(data->start_class, and_withp,
2564 struct regnode_charclass_class);
2565 flags &= ~SCF_DO_STCLASS_AND;
2566 StructCopy(&accum, data->start_class,
2567 struct regnode_charclass_class);
2568 flags |= SCF_DO_STCLASS_OR;
2569 data->start_class->flags |= ANYOF_EOS;
2573 if (PERL_ENABLE_TRIE_OPTIMISATION && OP( startbranch ) == BRANCH ) {
2576 Assuming this was/is a branch we are dealing with: 'scan' now
2577 points at the item that follows the branch sequence, whatever
2578 it is. We now start at the beginning of the sequence and look
2585 which would be constructed from a pattern like /A|LIST|OF|WORDS/
2587 If we can find such a subseqence we need to turn the first
2588 element into a trie and then add the subsequent branch exact
2589 strings to the trie.
2593 1. patterns where the whole set of branch can be converted.
2595 2. patterns where only a subset can be converted.
2597 In case 1 we can replace the whole set with a single regop
2598 for the trie. In case 2 we need to keep the start and end
2601 'BRANCH EXACT; BRANCH EXACT; BRANCH X'
2602 becomes BRANCH TRIE; BRANCH X;
2604 There is an additional case, that being where there is a
2605 common prefix, which gets split out into an EXACT like node
2606 preceding the TRIE node.
2608 If x(1..n)==tail then we can do a simple trie, if not we make
2609 a "jump" trie, such that when we match the appropriate word
2610 we "jump" to the appopriate tail node. Essentailly we turn
2611 a nested if into a case structure of sorts.
2616 if (!re_trie_maxbuff) {
2617 re_trie_maxbuff = get_sv(RE_TRIE_MAXBUF_NAME, 1);
2618 if (!SvIOK(re_trie_maxbuff))
2619 sv_setiv(re_trie_maxbuff, RE_TRIE_MAXBUF_INIT);
2621 if ( SvIV(re_trie_maxbuff)>=0 ) {
2623 regnode *first = (regnode *)NULL;
2624 regnode *last = (regnode *)NULL;
2625 regnode *tail = scan;
2630 SV * const mysv = sv_newmortal(); /* for dumping */
2632 /* var tail is used because there may be a TAIL
2633 regop in the way. Ie, the exacts will point to the
2634 thing following the TAIL, but the last branch will
2635 point at the TAIL. So we advance tail. If we
2636 have nested (?:) we may have to move through several
2640 while ( OP( tail ) == TAIL ) {
2641 /* this is the TAIL generated by (?:) */
2642 tail = regnext( tail );
2647 regprop(RExC_rx, mysv, tail );
2648 PerlIO_printf( Perl_debug_log, "%*s%s%s\n",
2649 (int)depth * 2 + 2, "",
2650 "Looking for TRIE'able sequences. Tail node is: ",
2651 SvPV_nolen_const( mysv )
2657 step through the branches, cur represents each
2658 branch, noper is the first thing to be matched
2659 as part of that branch and noper_next is the
2660 regnext() of that node. if noper is an EXACT
2661 and noper_next is the same as scan (our current
2662 position in the regex) then the EXACT branch is
2663 a possible optimization target. Once we have
2664 two or more consequetive such branches we can
2665 create a trie of the EXACT's contents and stich
2666 it in place. If the sequence represents all of
2667 the branches we eliminate the whole thing and
2668 replace it with a single TRIE. If it is a
2669 subsequence then we need to stitch it in. This
2670 means the first branch has to remain, and needs
2671 to be repointed at the item on the branch chain
2672 following the last branch optimized. This could
2673 be either a BRANCH, in which case the
2674 subsequence is internal, or it could be the
2675 item following the branch sequence in which
2676 case the subsequence is at the end.
2680 /* dont use tail as the end marker for this traverse */
2681 for ( cur = startbranch ; cur != scan ; cur = regnext( cur ) ) {
2682 regnode * const noper = NEXTOPER( cur );
2683 #if defined(DEBUGGING) || defined(NOJUMPTRIE)
2684 regnode * const noper_next = regnext( noper );
2688 regprop(RExC_rx, mysv, cur);
2689 PerlIO_printf( Perl_debug_log, "%*s- %s (%d)",
2690 (int)depth * 2 + 2,"", SvPV_nolen_const( mysv ), REG_NODE_NUM(cur) );
2692 regprop(RExC_rx, mysv, noper);
2693 PerlIO_printf( Perl_debug_log, " -> %s",
2694 SvPV_nolen_const(mysv));
2697 regprop(RExC_rx, mysv, noper_next );
2698 PerlIO_printf( Perl_debug_log,"\t=> %s\t",
2699 SvPV_nolen_const(mysv));
2701 PerlIO_printf( Perl_debug_log, "(First==%d,Last==%d,Cur==%d)\n",
2702 REG_NODE_NUM(first), REG_NODE_NUM(last), REG_NODE_NUM(cur) );
2704 if ( (((first && optype!=NOTHING) ? OP( noper ) == optype
2705 : PL_regkind[ OP( noper ) ] == EXACT )
2706 || OP(noper) == NOTHING )
2708 && noper_next == tail
2713 if ( !first || optype == NOTHING ) {
2714 if (!first) first = cur;
2715 optype = OP( noper );
2721 make_trie( pRExC_state,
2722 startbranch, first, cur, tail, count,
2725 if ( PL_regkind[ OP( noper ) ] == EXACT
2727 && noper_next == tail
2732 optype = OP( noper );
2742 regprop(RExC_rx, mysv, cur);
2743 PerlIO_printf( Perl_debug_log,
2744 "%*s- %s (%d) <SCAN FINISHED>\n", (int)depth * 2 + 2,
2745 "", SvPV_nolen_const( mysv ),REG_NODE_NUM(cur));
2749 made= make_trie( pRExC_state, startbranch, first, scan, tail, count, optype, depth+1 );
2750 #ifdef TRIE_STUDY_OPT
2751 if ( ((made == MADE_EXACT_TRIE &&
2752 startbranch == first)
2753 || ( first_non_open == first )) &&
2755 flags |= SCF_TRIE_RESTUDY;
2756 if ( startbranch == first
2759 RExC_seen &=~REG_TOP_LEVEL_BRANCHES;
2769 else if ( code == BRANCHJ ) { /* single branch is optimized. */
2770 scan = NEXTOPER(NEXTOPER(scan));
2771 } else /* single branch is optimized. */
2772 scan = NEXTOPER(scan);
2774 } else if (OP(scan) == SUSPEND || OP(scan) == GOSUB || OP(scan) == GOSTART) {
2775 scan_frame *newframe = NULL;
2780 if (OP(scan) != SUSPEND) {
2781 /* set the pointer */
2782 if (OP(scan) == GOSUB) {
2784 RExC_recurse[ARG2L(scan)] = scan;
2785 start = RExC_open_parens[paren-1];
2786 end = RExC_close_parens[paren-1];
2789 start = RExC_rxi->program + 1;
2793 Newxz(recursed, (((RExC_npar)>>3) +1), U8);
2794 SAVEFREEPV(recursed);
2796 if (!PAREN_TEST(recursed,paren+1)) {
2797 PAREN_SET(recursed,paren+1);
2798 Newx(newframe,1,scan_frame);
2800 if (flags & SCF_DO_SUBSTR) {
2801 SCAN_COMMIT(pRExC_state,data,minlenp);
2802 data->longest = &(data->longest_float);
2804 is_inf = is_inf_internal = 1;
2805 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
2806 cl_anything(pRExC_state, data->start_class);
2807 flags &= ~SCF_DO_STCLASS;
2810 Newx(newframe,1,scan_frame);
2813 end = regnext(scan);
2818 SAVEFREEPV(newframe);
2819 newframe->next = regnext(scan);
2820 newframe->last = last;
2821 newframe->stop = stopparen;
2822 newframe->prev = frame;
2832 else if (OP(scan) == EXACT) {
2833 I32 l = STR_LEN(scan);
2836 const U8 * const s = (U8*)STRING(scan);
2837 l = utf8_length(s, s + l);
2838 uc = utf8_to_uvchr(s, NULL);
2840 uc = *((U8*)STRING(scan));
2843 if (flags & SCF_DO_SUBSTR) { /* Update longest substr. */
2844 /* The code below prefers earlier match for fixed
2845 offset, later match for variable offset. */
2846 if (data->last_end == -1) { /* Update the start info. */
2847 data->last_start_min = data->pos_min;
2848 data->last_start_max = is_inf
2849 ? I32_MAX : data->pos_min + data->pos_delta;
2851 sv_catpvn(data->last_found, STRING(scan), STR_LEN(scan));
2853 SvUTF8_on(data->last_found);
2855 SV * const sv = data->last_found;
2856 MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
2857 mg_find(sv, PERL_MAGIC_utf8) : NULL;
2858 if (mg && mg->mg_len >= 0)
2859 mg->mg_len += utf8_length((U8*)STRING(scan),
2860 (U8*)STRING(scan)+STR_LEN(scan));
2862 data->last_end = data->pos_min + l;
2863 data->pos_min += l; /* As in the first entry. */
2864 data->flags &= ~SF_BEFORE_EOL;
2866 if (flags & SCF_DO_STCLASS_AND) {
2867 /* Check whether it is compatible with what we know already! */
2871 (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
2872 && !ANYOF_BITMAP_TEST(data->start_class, uc)
2873 && (!(data->start_class->flags & ANYOF_FOLD)
2874 || !ANYOF_BITMAP_TEST(data->start_class, PL_fold[uc])))
2877 ANYOF_CLASS_ZERO(data->start_class);
2878 ANYOF_BITMAP_ZERO(data->start_class);
2880 ANYOF_BITMAP_SET(data->start_class, uc);
2881 data->start_class->flags &= ~ANYOF_EOS;
2883 data->start_class->flags &= ~ANYOF_UNICODE_ALL;
2885 else if (flags & SCF_DO_STCLASS_OR) {
2886 /* false positive possible if the class is case-folded */
2888 ANYOF_BITMAP_SET(data->start_class, uc);
2890 data->start_class->flags |= ANYOF_UNICODE_ALL;
2891 data->start_class->flags &= ~ANYOF_EOS;
2892 cl_and(data->start_class, and_withp);
2894 flags &= ~SCF_DO_STCLASS;
2896 else if (PL_regkind[OP(scan)] == EXACT) { /* But OP != EXACT! */
2897 I32 l = STR_LEN(scan);
2898 UV uc = *((U8*)STRING(scan));
2900 /* Search for fixed substrings supports EXACT only. */
2901 if (flags & SCF_DO_SUBSTR) {
2903 SCAN_COMMIT(pRExC_state, data, minlenp);
2906 const U8 * const s = (U8 *)STRING(scan);
2907 l = utf8_length(s, s + l);
2908 uc = utf8_to_uvchr(s, NULL);
2911 if (flags & SCF_DO_SUBSTR)
2913 if (flags & SCF_DO_STCLASS_AND) {
2914 /* Check whether it is compatible with what we know already! */
2918 (!(data->start_class->flags & (ANYOF_CLASS | ANYOF_LOCALE))
2919 && !ANYOF_BITMAP_TEST(data->start_class, uc)
2920 && !ANYOF_BITMAP_TEST(data->start_class, PL_fold[uc])))
2922 ANYOF_CLASS_ZERO(data->start_class);
2923 ANYOF_BITMAP_ZERO(data->start_class);
2925 ANYOF_BITMAP_SET(data->start_class, uc);
2926 data->start_class->flags &= ~ANYOF_EOS;
2927 data->start_class->flags |= ANYOF_FOLD;
2928 if (OP(scan) == EXACTFL)
2929 data->start_class->flags |= ANYOF_LOCALE;
2932 else if (flags & SCF_DO_STCLASS_OR) {
2933 if (data->start_class->flags & ANYOF_FOLD) {
2934 /* false positive possible if the class is case-folded.
2935 Assume that the locale settings are the same... */
2937 ANYOF_BITMAP_SET(data->start_class, uc);
2938 data->start_class->flags &= ~ANYOF_EOS;
2940 cl_and(data->start_class, and_withp);
2942 flags &= ~SCF_DO_STCLASS;
2944 else if (strchr((const char*)PL_varies,OP(scan))) {
2945 I32 mincount, maxcount, minnext, deltanext, fl = 0;
2946 I32 f = flags, pos_before = 0;
2947 regnode * const oscan = scan;
2948 struct regnode_charclass_class this_class;
2949 struct regnode_charclass_class *oclass = NULL;
2950 I32 next_is_eval = 0;
2952 switch (PL_regkind[OP(scan)]) {
2953 case WHILEM: /* End of (?:...)* . */
2954 scan = NEXTOPER(scan);
2957 if (flags & (SCF_DO_SUBSTR | SCF_DO_STCLASS)) {
2958 next = NEXTOPER(scan);
2959 if (OP(next) == EXACT || (flags & SCF_DO_STCLASS)) {
2961 maxcount = REG_INFTY;
2962 next = regnext(scan);
2963 scan = NEXTOPER(scan);
2967 if (flags & SCF_DO_SUBSTR)
2972 if (flags & SCF_DO_STCLASS) {
2974 maxcount = REG_INFTY;
2975 next = regnext(scan);
2976 scan = NEXTOPER(scan);
2979 is_inf = is_inf_internal = 1;
2980 scan = regnext(scan);
2981 if (flags & SCF_DO_SUBSTR) {
2982 SCAN_COMMIT(pRExC_state, data, minlenp); /* Cannot extend fixed substrings */
2983 data->longest = &(data->longest_float);
2985 goto optimize_curly_tail;
2987 if (stopparen>0 && (OP(scan)==CURLYN || OP(scan)==CURLYM)
2988 && (scan->flags == stopparen))
2993 mincount = ARG1(scan);
2994 maxcount = ARG2(scan);
2996 next = regnext(scan);
2997 if (OP(scan) == CURLYX) {
2998 I32 lp = (data ? *(data->last_closep) : 0);
2999 scan->flags = ((lp <= (I32)U8_MAX) ? (U8)lp : U8_MAX);
3001 scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS;
3002 next_is_eval = (OP(scan) == EVAL);
3004 if (flags & SCF_DO_SUBSTR) {
3005 if (mincount == 0) SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot extend fixed substrings */
3006 pos_before = data->pos_min;
3010 data->flags &= ~(SF_HAS_PAR|SF_IN_PAR|SF_HAS_EVAL);
3012 data->flags |= SF_IS_INF;
3014 if (flags & SCF_DO_STCLASS) {
3015 cl_init(pRExC_state, &this_class);
3016 oclass = data->start_class;
3017 data->start_class = &this_class;
3018 f |= SCF_DO_STCLASS_AND;
3019 f &= ~SCF_DO_STCLASS_OR;
3021 /* These are the cases when once a subexpression
3022 fails at a particular position, it cannot succeed
3023 even after backtracking at the enclosing scope.
3025 XXXX what if minimal match and we are at the
3026 initial run of {n,m}? */
3027 if ((mincount != maxcount - 1) && (maxcount != REG_INFTY))
3028 f &= ~SCF_WHILEM_VISITED_POS;
3030 /* This will finish on WHILEM, setting scan, or on NULL: */
3031 minnext = study_chunk(pRExC_state, &scan, minlenp, &deltanext,
3032 last, data, stopparen, recursed, NULL,
3034 ? (f & ~SCF_DO_SUBSTR) : f),depth+1);
3036 if (flags & SCF_DO_STCLASS)
3037 data->start_class = oclass;
3038 if (mincount == 0 || minnext == 0) {
3039 if (flags & SCF_DO_STCLASS_OR) {
3040 cl_or(pRExC_state, data->start_class, &this_class);
3042 else if (flags & SCF_DO_STCLASS_AND) {
3043 /* Switch to OR mode: cache the old value of
3044 * data->start_class */
3046 StructCopy(data->start_class, and_withp,
3047 struct regnode_charclass_class);
3048 flags &= ~SCF_DO_STCLASS_AND;
3049 StructCopy(&this_class, data->start_class,
3050 struct regnode_charclass_class);
3051 flags |= SCF_DO_STCLASS_OR;
3052 data->start_class->flags |= ANYOF_EOS;
3054 } else { /* Non-zero len */
3055 if (flags & SCF_DO_STCLASS_OR) {
3056 cl_or(pRExC_state, data->start_class, &this_class);
3057 cl_and(data->start_class, and_withp);
3059 else if (flags & SCF_DO_STCLASS_AND)
3060 cl_and(data->start_class, &this_class);
3061 flags &= ~SCF_DO_STCLASS;
3063 if (!scan) /* It was not CURLYX, but CURLY. */
3065 if ( /* ? quantifier ok, except for (?{ ... }) */
3066 (next_is_eval || !(mincount == 0 && maxcount == 1))
3067 && (minnext == 0) && (deltanext == 0)
3068 && data && !(data->flags & (SF_HAS_PAR|SF_IN_PAR))
3069 && maxcount <= REG_INFTY/3 /* Complement check for big count */
3070 && ckWARN(WARN_REGEXP))
3073 "Quantifier unexpected on zero-length expression");
3076 min += minnext * mincount;
3077 is_inf_internal |= ((maxcount == REG_INFTY
3078 && (minnext + deltanext) > 0)
3079 || deltanext == I32_MAX);
3080 is_inf |= is_inf_internal;
3081 delta += (minnext + deltanext) * maxcount - minnext * mincount;
3083 /* Try powerful optimization CURLYX => CURLYN. */
3084 if ( OP(oscan) == CURLYX && data
3085 && data->flags & SF_IN_PAR
3086 && !(data->flags & SF_HAS_EVAL)
3087 && !deltanext && minnext == 1 ) {
3088 /* Try to optimize to CURLYN. */
3089 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS;
3090 regnode * const nxt1 = nxt;
3097 if (!strchr((const char*)PL_simple,OP(nxt))
3098 && !(PL_regkind[OP(nxt)] == EXACT
3099 && STR_LEN(nxt) == 1))
3105 if (OP(nxt) != CLOSE)
3107 if (RExC_open_parens) {
3108 RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
3109 RExC_close_parens[ARG(nxt1)-1]=nxt+2; /*close->while*/
3111 /* Now we know that nxt2 is the only contents: */
3112 oscan->flags = (U8)ARG(nxt);
3114 OP(nxt1) = NOTHING; /* was OPEN. */
3117 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
3118 NEXT_OFF(nxt1+ 1) = 0; /* just for consistancy. */
3119 NEXT_OFF(nxt2) = 0; /* just for consistancy with CURLY. */
3120 OP(nxt) = OPTIMIZED; /* was CLOSE. */
3121 OP(nxt + 1) = OPTIMIZED; /* was count. */
3122 NEXT_OFF(nxt+ 1) = 0; /* just for consistancy. */
3127 /* Try optimization CURLYX => CURLYM. */
3128 if ( OP(oscan) == CURLYX && data
3129 && !(data->flags & SF_HAS_PAR)
3130 && !(data->flags & SF_HAS_EVAL)
3131 && !deltanext /* atom is fixed width */
3132 && minnext != 0 /* CURLYM can't handle zero width */
3134 /* XXXX How to optimize if data == 0? */
3135 /* Optimize to a simpler form. */
3136 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN */
3140 while ( (nxt2 = regnext(nxt)) /* skip over embedded stuff*/
3141 && (OP(nxt2) != WHILEM))
3143 OP(nxt2) = SUCCEED; /* Whas WHILEM */
3144 /* Need to optimize away parenths. */
3145 if (data->flags & SF_IN_PAR) {
3146 /* Set the parenth number. */
3147 regnode *nxt1 = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN*/
3149 if (OP(nxt) != CLOSE)
3150 FAIL("Panic opt close");
3151 oscan->flags = (U8)ARG(nxt);
3152 if (RExC_open_parens) {
3153 RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
3154 RExC_close_parens[ARG(nxt1)-1]=nxt2+1; /*close->NOTHING*/
3156 OP(nxt1) = OPTIMIZED; /* was OPEN. */
3157 OP(nxt) = OPTIMIZED; /* was CLOSE. */
3160 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
3161 OP(nxt + 1) = OPTIMIZED; /* was count. */
3162 NEXT_OFF(nxt1 + 1) = 0; /* just for consistancy. */
3163 NEXT_OFF(nxt + 1) = 0; /* just for consistancy. */
3166 while ( nxt1 && (OP(nxt1) != WHILEM)) {
3167 regnode *nnxt = regnext(nxt1);
3170 if (reg_off_by_arg[OP(nxt1)])
3171 ARG_SET(nxt1, nxt2 - nxt1);
3172 else if (nxt2 - nxt1 < U16_MAX)
3173 NEXT_OFF(nxt1) = nxt2 - nxt1;
3175 OP(nxt) = NOTHING; /* Cannot beautify */
3180 /* Optimize again: */
3181 study_chunk(pRExC_state, &nxt1, minlenp, &deltanext, nxt,
3182 NULL, stopparen, recursed, NULL, 0,depth+1);
3187 else if ((OP(oscan) == CURLYX)
3188 && (flags & SCF_WHILEM_VISITED_POS)
3189 /* See the comment on a similar expression above.
3190 However, this time it not a subexpression
3191 we care about, but the expression itself. */
3192 && (maxcount == REG_INFTY)
3193 && data && ++data->whilem_c < 16) {
3194 /* This stays as CURLYX, we can put the count/of pair. */
3195 /* Find WHILEM (as in regexec.c) */
3196 regnode *nxt = oscan + NEXT_OFF(oscan);
3198 if (OP(PREVOPER(nxt)) == NOTHING) /* LONGJMP */
3200 PREVOPER(nxt)->flags = (U8)(data->whilem_c
3201 | (RExC_whilem_seen << 4)); /* On WHILEM */
3203 if (data && fl & (SF_HAS_PAR|SF_IN_PAR))
3205 if (flags & SCF_DO_SUBSTR) {
3206 SV *last_str = NULL;
3207 int counted = mincount != 0;
3209 if (data->last_end > 0 && mincount != 0) { /* Ends with a string. */
3210 #if defined(SPARC64_GCC_WORKAROUND)
3213 const char *s = NULL;
3216 if (pos_before >= data->last_start_min)
3219 b = data->last_start_min;
3222 s = SvPV_const(data->last_found, l);
3223 old = b - data->last_start_min;
3226 I32 b = pos_before >= data->last_start_min
3227 ? pos_before : data->last_start_min;
3229 const char * const s = SvPV_const(data->last_found, l);
3230 I32 old = b - data->last_start_min;
3234 old = utf8_hop((U8*)s, old) - (U8*)s;
3237 /* Get the added string: */
3238 last_str = newSVpvn(s + old, l);
3240 SvUTF8_on(last_str);
3241 if (deltanext == 0 && pos_before == b) {
3242 /* What was added is a constant string */
3244 SvGROW(last_str, (mincount * l) + 1);
3245 repeatcpy(SvPVX(last_str) + l,
3246 SvPVX_const(last_str), l, mincount - 1);
3247 SvCUR_set(last_str, SvCUR(last_str) * mincount);
3248 /* Add additional parts. */
3249 SvCUR_set(data->last_found,
3250 SvCUR(data->last_found) - l);
3251 sv_catsv(data->last_found, last_str);
3253 SV * sv = data->last_found;
3255 SvUTF8(sv) && SvMAGICAL(sv) ?
3256 mg_find(sv, PERL_MAGIC_utf8) : NULL;
3257 if (mg && mg->mg_len >= 0)
3258 mg->mg_len += CHR_SVLEN(last_str);
3260 data->last_end += l * (mincount - 1);
3263 /* start offset must point into the last copy */
3264 data->last_start_min += minnext * (mincount - 1);
3265 data->last_start_max += is_inf ? I32_MAX
3266 : (maxcount - 1) * (minnext + data->pos_delta);
3269 /* It is counted once already... */
3270 data->pos_min += minnext * (mincount - counted);
3271 data->pos_delta += - counted * deltanext +
3272 (minnext + deltanext) * maxcount - minnext * mincount;
3273 if (mincount != maxcount) {
3274 /* Cannot extend fixed substrings found inside
3276 SCAN_COMMIT(pRExC_state,data,minlenp);
3277 if (mincount && last_str) {
3278 SV * const sv = data->last_found;
3279 MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
3280 mg_find(sv, PERL_MAGIC_utf8) : NULL;
3284 sv_setsv(sv, last_str);
3285 data->last_end = data->pos_min;
3286 data->last_start_min =
3287 data->pos_min - CHR_SVLEN(last_str);
3288 data->last_start_max = is_inf
3290 : data->pos_min + data->pos_delta
3291 - CHR_SVLEN(last_str);
3293 data->longest = &(data->longest_float);
3295 SvREFCNT_dec(last_str);
3297 if (data && (fl & SF_HAS_EVAL))
3298 data->flags |= SF_HAS_EVAL;
3299 optimize_curly_tail:
3300 if (OP(oscan) != CURLYX) {
3301 while (PL_regkind[OP(next = regnext(oscan))] == NOTHING
3303 NEXT_OFF(oscan) += NEXT_OFF(next);
3306 default: /* REF and CLUMP only? */
3307 if (flags & SCF_DO_SUBSTR) {
3308 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3309 data->longest = &(data->longest_float);
3311 is_inf = is_inf_internal = 1;
3312 if (flags & SCF_DO_STCLASS_OR)
3313 cl_anything(pRExC_state, data->start_class);
3314 flags &= ~SCF_DO_STCLASS;
3318 else if (strchr((const char*)PL_simple,OP(scan))) {
3321 if (flags & SCF_DO_SUBSTR) {
3322 SCAN_COMMIT(pRExC_state,data,minlenp);
3326 if (flags & SCF_DO_STCLASS) {
3327 data->start_class->flags &= ~ANYOF_EOS; /* No match on empty */
3329 /* Some of the logic below assumes that switching
3330 locale on will only add false positives. */
3331 switch (PL_regkind[OP(scan)]) {
3335 /* Perl_croak(aTHX_ "panic: unexpected simple REx opcode %d", OP(scan)); */
3336 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
3337 cl_anything(pRExC_state, data->start_class);
3340 if (OP(scan) == SANY)
3342 if (flags & SCF_DO_STCLASS_OR) { /* Everything but \n */
3343 value = (ANYOF_BITMAP_TEST(data->start_class,'\n')
3344 || (data->start_class->flags & ANYOF_CLASS));
3345 cl_anything(pRExC_state, data->start_class);
3347 if (flags & SCF_DO_STCLASS_AND || !value)
3348 ANYOF_BITMAP_CLEAR(data->start_class,'\n');
3351 if (flags & SCF_DO_STCLASS_AND)
3352 cl_and(data->start_class,
3353 (struct regnode_charclass_class*)scan);
3355 cl_or(pRExC_state, data->start_class,
3356 (struct regnode_charclass_class*)scan);
3359 if (flags & SCF_DO_STCLASS_AND) {
3360 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3361 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NALNUM);
3362 for (value = 0; value < 256; value++)
3363 if (!isALNUM(value))
3364 ANYOF_BITMAP_CLEAR(data->start_class, value);
3368 if (data->start_class->flags & ANYOF_LOCALE)
3369 ANYOF_CLASS_SET(data->start_class,ANYOF_ALNUM);
3371 for (value = 0; value < 256; value++)
3373 ANYOF_BITMAP_SET(data->start_class, value);
3378 if (flags & SCF_DO_STCLASS_AND) {
3379 if (data->start_class->flags & ANYOF_LOCALE)
3380 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NALNUM);
3383 ANYOF_CLASS_SET(data->start_class,ANYOF_ALNUM);
3384 data->start_class->flags |= ANYOF_LOCALE;
3388 if (flags & SCF_DO_STCLASS_AND) {
3389 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3390 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_ALNUM);
3391 for (value = 0; value < 256; value++)
3393 ANYOF_BITMAP_CLEAR(data->start_class, value);
3397 if (data->start_class->flags & ANYOF_LOCALE)
3398 ANYOF_CLASS_SET(data->start_class,ANYOF_NALNUM);
3400 for (value = 0; value < 256; value++)
3401 if (!isALNUM(value))
3402 ANYOF_BITMAP_SET(data->start_class, value);
3407 if (flags & SCF_DO_STCLASS_AND) {
3408 if (data->start_class->flags & ANYOF_LOCALE)
3409 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_ALNUM);
3412 data->start_class->flags |= ANYOF_LOCALE;
3413 ANYOF_CLASS_SET(data->start_class,ANYOF_NALNUM);
3417 if (flags & SCF_DO_STCLASS_AND) {
3418 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3419 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NSPACE);
3420 for (value = 0; value < 256; value++)
3421 if (!isSPACE(value))
3422 ANYOF_BITMAP_CLEAR(data->start_class, value);
3426 if (data->start_class->flags & ANYOF_LOCALE)
3427 ANYOF_CLASS_SET(data->start_class,ANYOF_SPACE);
3429 for (value = 0; value < 256; value++)
3431 ANYOF_BITMAP_SET(data->start_class, value);
3436 if (flags & SCF_DO_STCLASS_AND) {
3437 if (data->start_class->flags & ANYOF_LOCALE)
3438 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NSPACE);
3441 data->start_class->flags |= ANYOF_LOCALE;
3442 ANYOF_CLASS_SET(data->start_class,ANYOF_SPACE);
3446 if (flags & SCF_DO_STCLASS_AND) {
3447 if (!(data->start_class->flags & ANYOF_LOCALE)) {
3448 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_SPACE);
3449 for (value = 0; value < 256; value++)
3451 ANYOF_BITMAP_CLEAR(data->start_class, value);
3455 if (data->start_class->flags & ANYOF_LOCALE)
3456 ANYOF_CLASS_SET(data->start_class,ANYOF_NSPACE);
3458 for (value = 0; value < 256; value++)
3459 if (!isSPACE(value))
3460 ANYOF_BITMAP_SET(data->start_class, value);
3465 if (flags & SCF_DO_STCLASS_AND) {
3466 if (data->start_class->flags & ANYOF_LOCALE) {
3467 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_SPACE);
3468 for (value = 0; value < 256; value++)
3469 if (!isSPACE(value))
3470 ANYOF_BITMAP_CLEAR(data->start_class, value);
3474 data->start_class->flags |= ANYOF_LOCALE;
3475 ANYOF_CLASS_SET(data->start_class,ANYOF_NSPACE);
3479 if (flags & SCF_DO_STCLASS_AND) {
3480 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_NDIGIT);
3481 for (value = 0; value < 256; value++)
3482 if (!isDIGIT(value))
3483 ANYOF_BITMAP_CLEAR(data->start_class, value);
3486 if (data->start_class->flags & ANYOF_LOCALE)
3487 ANYOF_CLASS_SET(data->start_class,ANYOF_DIGIT);
3489 for (value = 0; value < 256; value++)
3491 ANYOF_BITMAP_SET(data->start_class, value);
3496 if (flags & SCF_DO_STCLASS_AND) {
3497 ANYOF_CLASS_CLEAR(data->start_class,ANYOF_DIGIT);
3498 for (value = 0; value < 256; value++)
3500 ANYOF_BITMAP_CLEAR(data->start_class, value);
3503 if (data->start_class->flags & ANYOF_LOCALE)
3504 ANYOF_CLASS_SET(data->start_class,ANYOF_NDIGIT);
3506 for (value = 0; value < 256; value++)
3507 if (!isDIGIT(value))
3508 ANYOF_BITMAP_SET(data->start_class, value);
3513 if (flags & SCF_DO_STCLASS_OR)
3514 cl_and(data->start_class, and_withp);
3515 flags &= ~SCF_DO_STCLASS;
3518 else if (PL_regkind[OP(scan)] == EOL && flags & SCF_DO_SUBSTR) {
3519 data->flags |= (OP(scan) == MEOL
3523 else if ( PL_regkind[OP(scan)] == BRANCHJ
3524 /* Lookbehind, or need to calculate parens/evals/stclass: */
3525 && (scan->flags || data || (flags & SCF_DO_STCLASS))
3526 && (OP(scan) == IFMATCH || OP(scan) == UNLESSM)) {
3527 if ( !PERL_ENABLE_POSITIVE_ASSERTION_STUDY
3528 || OP(scan) == UNLESSM )
3530 /* Negative Lookahead/lookbehind
3531 In this case we can't do fixed string optimisation.
3534 I32 deltanext, minnext, fake = 0;
3536 struct regnode_charclass_class intrnl;
3539 data_fake.flags = 0;
3541 data_fake.whilem_c = data->whilem_c;
3542 data_fake.last_closep = data->last_closep;
3545 data_fake.last_closep = &fake;
3546 data_fake.pos_delta = delta;
3547 if ( flags & SCF_DO_STCLASS && !scan->flags
3548 && OP(scan) == IFMATCH ) { /* Lookahead */
3549 cl_init(pRExC_state, &intrnl);
3550 data_fake.start_class = &intrnl;
3551 f |= SCF_DO_STCLASS_AND;
3553 if (flags & SCF_WHILEM_VISITED_POS)
3554 f |= SCF_WHILEM_VISITED_POS;
3555 next = regnext(scan);
3556 nscan = NEXTOPER(NEXTOPER(scan));
3557 minnext = study_chunk(pRExC_state, &nscan, minlenp, &deltanext,
3558 last, &data_fake, stopparen, recursed, NULL, f, depth+1);
3561 FAIL("Variable length lookbehind not implemented");
3563 else if (minnext > (I32)U8_MAX) {
3564 FAIL2("Lookbehind longer than %"UVuf" not implemented", (UV)U8_MAX);
3566 scan->flags = (U8)minnext;
3569 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3571 if (data_fake.flags & SF_HAS_EVAL)
3572 data->flags |= SF_HAS_EVAL;
3573 data->whilem_c = data_fake.whilem_c;
3575 if (f & SCF_DO_STCLASS_AND) {
3576 const int was = (data->start_class->flags & ANYOF_EOS);
3578 cl_and(data->start_class, &intrnl);
3580 data->start_class->flags |= ANYOF_EOS;
3583 #if PERL_ENABLE_POSITIVE_ASSERTION_STUDY
3585 /* Positive Lookahead/lookbehind
3586 In this case we can do fixed string optimisation,
3587 but we must be careful about it. Note in the case of
3588 lookbehind the positions will be offset by the minimum
3589 length of the pattern, something we won't know about
3590 until after the recurse.
3592 I32 deltanext, fake = 0;
3594 struct regnode_charclass_class intrnl;
3596 /* We use SAVEFREEPV so that when the full compile
3597 is finished perl will clean up the allocated
3598 minlens when its all done. This was we don't
3599 have to worry about freeing them when we know
3600 they wont be used, which would be a pain.
3603 Newx( minnextp, 1, I32 );
3604 SAVEFREEPV(minnextp);
3607 StructCopy(data, &data_fake, scan_data_t);
3608 if ((flags & SCF_DO_SUBSTR) && data->last_found) {
3611 SCAN_COMMIT(pRExC_state, &data_fake,minlenp);
3612 data_fake.last_found=newSVsv(data->last_found);
3616 data_fake.last_closep = &fake;
3617 data_fake.flags = 0;
3618 data_fake.pos_delta = delta;
3620 data_fake.flags |= SF_IS_INF;
3621 if ( flags & SCF_DO_STCLASS && !scan->flags
3622 && OP(scan) == IFMATCH ) { /* Lookahead */
3623 cl_init(pRExC_state, &intrnl);
3624 data_fake.start_class = &intrnl;
3625 f |= SCF_DO_STCLASS_AND;
3627 if (flags & SCF_WHILEM_VISITED_POS)
3628 f |= SCF_WHILEM_VISITED_POS;
3629 next = regnext(scan);
3630 nscan = NEXTOPER(NEXTOPER(scan));
3632 *minnextp = study_chunk(pRExC_state, &nscan, minnextp, &deltanext,
3633 last, &data_fake, stopparen, recursed, NULL, f,depth+1);
3636 FAIL("Variable length lookbehind not implemented");
3638 else if (*minnextp > (I32)U8_MAX) {
3639 FAIL2("Lookbehind longer than %"UVuf" not implemented", (UV)U8_MAX);
3641 scan->flags = (U8)*minnextp;
3646 if (f & SCF_DO_STCLASS_AND) {
3647 const int was = (data->start_class->flags & ANYOF_EOS);
3649 cl_and(data->start_class, &intrnl);
3651 data->start_class->flags |= ANYOF_EOS;
3654 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3656 if (data_fake.flags & SF_HAS_EVAL)
3657 data->flags |= SF_HAS_EVAL;
3658 data->whilem_c = data_fake.whilem_c;
3659 if ((flags & SCF_DO_SUBSTR) && data_fake.last_found) {
3660 if (RExC_rx->minlen<*minnextp)
3661 RExC_rx->minlen=*minnextp;
3662 SCAN_COMMIT(pRExC_state, &data_fake, minnextp);
3663 SvREFCNT_dec(data_fake.last_found);
3665 if ( data_fake.minlen_fixed != minlenp )
3667 data->offset_fixed= data_fake.offset_fixed;
3668 data->minlen_fixed= data_fake.minlen_fixed;
3669 data->lookbehind_fixed+= scan->flags;
3671 if ( data_fake.minlen_float != minlenp )
3673 data->minlen_float= data_fake.minlen_float;
3674 data->offset_float_min=data_fake.offset_float_min;
3675 data->offset_float_max=data_fake.offset_float_max;
3676 data->lookbehind_float+= scan->flags;
3685 else if (OP(scan) == OPEN) {
3686 if (stopparen != (I32)ARG(scan))
3689 else if (OP(scan) == CLOSE) {
3690 if (stopparen == (I32)ARG(scan)) {
3693 if ((I32)ARG(scan) == is_par) {
3694 next = regnext(scan);
3696 if ( next && (OP(next) != WHILEM) && next < last)
3697 is_par = 0; /* Disable optimization */
3700 *(data->last_closep) = ARG(scan);
3702 else if (OP(scan) == EVAL) {
3704 data->flags |= SF_HAS_EVAL;
3706 else if ( PL_regkind[OP(scan)] == ENDLIKE ) {
3707 if (flags & SCF_DO_SUBSTR) {
3708 SCAN_COMMIT(pRExC_state,data,minlenp);
3709 flags &= ~SCF_DO_SUBSTR;
3711 if (data && OP(scan)==ACCEPT) {
3712 data->flags |= SCF_SEEN_ACCEPT;
3717 else if (OP(scan) == LOGICAL && scan->flags == 2) /* Embedded follows */
3719 if (flags & SCF_DO_SUBSTR) {
3720 SCAN_COMMIT(pRExC_state,data,minlenp);
3721 data->longest = &(data->longest_float);
3723 is_inf = is_inf_internal = 1;
3724 if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
3725 cl_anything(pRExC_state, data->start_class);
3726 flags &= ~SCF_DO_STCLASS;
3728 else if (OP(scan) == GPOS) {
3729 if (!(RExC_rx->extflags & RXf_GPOS_FLOAT) &&
3730 !(delta || is_inf || (data && data->pos_delta)))
3732 if (!(RExC_rx->extflags & RXf_ANCH) && (flags & SCF_DO_SUBSTR))
3733 RExC_rx->extflags |= RXf_ANCH_GPOS;
3734 if (RExC_rx->gofs < (U32)min)
3735 RExC_rx->gofs = min;
3737 RExC_rx->extflags |= RXf_GPOS_FLOAT;
3741 #ifdef TRIE_STUDY_OPT
3742 #ifdef FULL_TRIE_STUDY
3743 else if (PL_regkind[OP(scan)] == TRIE) {
3744 /* NOTE - There is similar code to this block above for handling
3745 BRANCH nodes on the initial study. If you change stuff here
3747 regnode *trie_node= scan;
3748 regnode *tail= regnext(scan);
3749 reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
3750 I32 max1 = 0, min1 = I32_MAX;
3751 struct regnode_charclass_class accum;
3753 if (flags & SCF_DO_SUBSTR) /* XXXX Add !SUSPEND? */
3754 SCAN_COMMIT(pRExC_state, data,minlenp); /* Cannot merge strings after this. */
3755 if (flags & SCF_DO_STCLASS)
3756 cl_init_zero(pRExC_state, &accum);
3762 const regnode *nextbranch= NULL;
3765 for ( word=1 ; word <= trie->wordcount ; word++)
3767 I32 deltanext=0, minnext=0, f = 0, fake;
3768 struct regnode_charclass_class this_class;
3770 data_fake.flags = 0;
3772 data_fake.whilem_c = data->whilem_c;
3773 data_fake.last_closep = data->last_closep;
3776 data_fake.last_closep = &fake;
3777 data_fake.pos_delta = delta;
3778 if (flags & SCF_DO_STCLASS) {
3779 cl_init(pRExC_state, &this_class);
3780 data_fake.start_class = &this_class;
3781 f = SCF_DO_STCLASS_AND;
3783 if (flags & SCF_WHILEM_VISITED_POS)
3784 f |= SCF_WHILEM_VISITED_POS;
3786 if (trie->jump[word]) {
3788 nextbranch = trie_node + trie->jump[0];
3789 scan= trie_node + trie->jump[word];
3790 /* We go from the jump point to the branch that follows
3791 it. Note this means we need the vestigal unused branches
3792 even though they arent otherwise used.
3794 minnext = study_chunk(pRExC_state, &scan, minlenp,
3795 &deltanext, (regnode *)nextbranch, &data_fake,
3796 stopparen, recursed, NULL, f,depth+1);
3798 if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
3799 nextbranch= regnext((regnode*)nextbranch);
3801 if (min1 > (I32)(minnext + trie->minlen))
3802 min1 = minnext + trie->minlen;
3803 if (max1 < (I32)(minnext + deltanext + trie->maxlen))
3804 max1 = minnext + deltanext + trie->maxlen;
3805 if (deltanext == I32_MAX)
3806 is_inf = is_inf_internal = 1;
3808 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
3810 if (data_fake.flags & SCF_SEEN_ACCEPT) {
3811 if ( stopmin > min + min1)
3812 stopmin = min + min1;
3813 flags &= ~SCF_DO_SUBSTR;
3815 data->flags |= SCF_SEEN_ACCEPT;
3818 if (data_fake.flags & SF_HAS_EVAL)
3819 data->flags |= SF_HAS_EVAL;
3820 data->whilem_c = data_fake.whilem_c;
3822 if (flags & SCF_DO_STCLASS)
3823 cl_or(pRExC_state, &accum, &this_class);
3826 if (flags & SCF_DO_SUBSTR) {
3827 data->pos_min += min1;
3828 data->pos_delta += max1 - min1;
3829 if (max1 != min1 || is_inf)
3830 data->longest = &(data->longest_float);
3833 delta += max1 - min1;
3834 if (flags & SCF_DO_STCLASS_OR) {
3835 cl_or(pRExC_state, data->start_class, &accum);
3837 cl_and(data->start_class, and_withp);
3838 flags &= ~SCF_DO_STCLASS;
3841 else if (flags & SCF_DO_STCLASS_AND) {
3843 cl_and(data->start_class, &accum);
3844 flags &= ~SCF_DO_STCLASS;
3847 /* Switch to OR mode: cache the old value of
3848 * data->start_class */
3850 StructCopy(data->start_class, and_withp,
3851 struct regnode_charclass_class);
3852 flags &= ~SCF_DO_STCLASS_AND;
3853 StructCopy(&accum, data->start_class,
3854 struct regnode_charclass_class);
3855 flags |= SCF_DO_STCLASS_OR;
3856 data->start_class->flags |= ANYOF_EOS;
3863 else if (PL_regkind[OP(scan)] == TRIE) {
3864 reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
3867 min += trie->minlen;
3868 delta += (trie->maxlen - trie->minlen);
3869 flags &= ~SCF_DO_STCLASS; /* xxx */
3870 if (flags & SCF_DO_SUBSTR) {
3871 SCAN_COMMIT(pRExC_state,data,minlenp); /* Cannot expect anything... */
3872 data->pos_min += trie->minlen;
3873 data->pos_delta += (trie->maxlen - trie->minlen);
3874 if (trie->maxlen != trie->minlen)
3875 data->longest = &(data->longest_float);
3877 if (trie->jump) /* no more substrings -- for now /grr*/
3878 flags &= ~SCF_DO_SUBSTR;
3880 #endif /* old or new */
3881 #endif /* TRIE_STUDY_OPT */
3882 /* Else: zero-length, ignore. */
3883 scan = regnext(scan);
3888 stopparen = frame->stop;
3889 frame = frame->prev;
3890 goto fake_study_recurse;
3895 DEBUG_STUDYDATA("pre-fin:",data,depth);
3898 *deltap = is_inf_internal ? I32_MAX : delta;
3899 if (flags & SCF_DO_SUBSTR && is_inf)
3900 data->pos_delta = I32_MAX - data->pos_min;
3901 if (is_par > (I32)U8_MAX)
3903 if (is_par && pars==1 && data) {
3904 data->flags |= SF_IN_PAR;
3905 data->flags &= ~SF_HAS_PAR;
3907 else if (pars && data) {
3908 data->flags |= SF_HAS_PAR;
3909 data->flags &= ~SF_IN_PAR;
3911 if (flags & SCF_DO_STCLASS_OR)
3912 cl_and(data->start_class, and_withp);
3913 if (flags & SCF_TRIE_RESTUDY)
3914 data->flags |= SCF_TRIE_RESTUDY;
3916 DEBUG_STUDYDATA("post-fin:",data,depth);
3918 return min < stopmin ? min : stopmin;
3922 S_add_data(RExC_state_t *pRExC_state, U32 n, const char *s)
3924 U32 count = RExC_rxi->data ? RExC_rxi->data->count : 0;
3926 Renewc(RExC_rxi->data,
3927 sizeof(*RExC_rxi->data) + sizeof(void*) * (count + n - 1),
3928 char, struct reg_data);
3930 Renew(RExC_rxi->data->what, count + n, U8);
3932 Newx(RExC_rxi->data->what, n, U8);
3933 RExC_rxi->data->count = count + n;
3934 Copy(s, RExC_rxi->data->what + count, n, U8);
3938 /*XXX: todo make this not included in a non debugging perl */
3939 #ifndef PERL_IN_XSUB_RE
3941 Perl_reginitcolors(pTHX)
3944 const char * const s = PerlEnv_getenv("PERL_RE_COLORS");
3946 char *t = savepv(s);
3950 t = strchr(t, '\t');
3956 PL_colors[i] = t = (char *)"";
3961 PL_colors[i++] = (char *)"";
3968 #ifdef TRIE_STUDY_OPT
3969 #define CHECK_RESTUDY_GOTO \
3971 (data.flags & SCF_TRIE_RESTUDY) \
3975 #define CHECK_RESTUDY_GOTO
3979 - pregcomp - compile a regular expression into internal code
3981 * We can't allocate space until we know how big the compiled form will be,
3982 * but we can't compile it (and thus know how big it is) until we've got a
3983 * place to put the code. So we cheat: we compile it twice, once with code
3984 * generation turned off and size counting turned on, and once "for real".
3985 * This also means that we don't allocate space until we are sure that the
3986 * thing really will compile successfully, and we never have to move the
3987 * code and thus invalidate pointers into it. (Note that it has to be in
3988 * one piece because free() must be able to free it all.) [NB: not true in perl]
3990 * Beware that the optimization-preparation code in here knows about some
3991 * of the structure of the compiled regexp. [I'll say.]
3996 #ifndef PERL_IN_XSUB_RE
3997 #define RE_ENGINE_PTR &PL_core_reg_engine
3999 extern const struct regexp_engine my_reg_engine;
4000 #define RE_ENGINE_PTR &my_reg_engine
4003 #ifndef PERL_IN_XSUB_RE
4005 Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
4008 HV * const table = GvHV(PL_hintgv);
4009 /* Dispatch a request to compile a regexp to correct
4012 SV **ptr= hv_fetchs(table, "regcomp", FALSE);
4013 GET_RE_DEBUG_FLAGS_DECL;
4014 if (ptr && SvIOK(*ptr) && SvIV(*ptr)) {
4015 const regexp_engine *eng=INT2PTR(regexp_engine*,SvIV(*ptr));
4017 PerlIO_printf(Perl_debug_log, "Using engine %"UVxf"\n",
4020 return CALLREGCOMP_ENG(eng, exp, xend, pm);
4023 return Perl_re_compile(aTHX_ exp, xend, pm);
4028 Perl_re_compile(pTHX_ char *exp, char *xend, PMOP *pm)
4032 register regexp_internal *ri;
4040 RExC_state_t RExC_state;
4041 RExC_state_t * const pRExC_state = &RExC_state;
4042 #ifdef TRIE_STUDY_OPT
4044 RExC_state_t copyRExC_state;
4046 GET_RE_DEBUG_FLAGS_DECL;
4047 DEBUG_r(if (!PL_colorset) reginitcolors());
4050 FAIL("NULL regexp argument");
4052 RExC_utf8 = pm->op_pmdynflags & PMdf_CMP_UTF8;
4056 SV *dsv= sv_newmortal();
4057 RE_PV_QUOTED_DECL(s, RExC_utf8,
4058 dsv, RExC_precomp, (xend - exp), 60);
4059 PerlIO_printf(Perl_debug_log, "%sCompiling REx%s %s\n",
4060 PL_colors[4],PL_colors[5],s);
4062 RExC_flags = pm->op_pmflags;
4066 RExC_seen_zerolen = *exp == '^' ? -1 : 0;
4067 RExC_seen_evals = 0;
4070 /* First pass: determine size, legality. */
4078 RExC_emit = &PL_regdummy;
4079 RExC_whilem_seen = 0;
4080 RExC_charnames = NULL;
4081 RExC_open_parens = NULL;
4082 RExC_close_parens = NULL;
4084 RExC_paren_names = NULL;
4086 RExC_paren_name_list = NULL;
4088 RExC_recurse = NULL;
4089 RExC_recurse_count = 0;
4091 #if 0 /* REGC() is (currently) a NOP at the first pass.
4092 * Clever compilers notice this and complain. --jhi */
4093 REGC((U8)REG_MAGIC, (char*)RExC_emit);
4095 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log, "Starting first pass (sizing)\n"));
4096 if (reg(pRExC_state, 0, &flags,1) == NULL) {
4097 RExC_precomp = NULL;
4101 PerlIO_printf(Perl_debug_log,
4102 "Required size %"IVdf" nodes\n"
4103 "Starting second pass (creation)\n",
4106 RExC_lastparse=NULL;
4108 /* Small enough for pointer-storage convention?
4109 If extralen==0, this means that we will not need long jumps. */
4110 if (RExC_size >= 0x10000L && RExC_extralen)
4111 RExC_size += RExC_extralen;
4114 if (RExC_whilem_seen > 15)
4115 RExC_whilem_seen = 15;
4118 /* Make room for a sentinel value at the end of the program */
4122 /* Allocate space and zero-initialize. Note, the two step process
4123 of zeroing when in debug mode, thus anything assigned has to
4124 happen after that */
4125 Newxz(r, 1, regexp);
4126 Newxc(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode),
4127 char, regexp_internal);
4128 if ( r == NULL || ri == NULL )
4129 FAIL("Regexp out of space");
4131 /* avoid reading uninitialized memory in DEBUGGING code in study_chunk() */
4132 Zero(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode), char);
4134 /* bulk initialize base fields with 0. */
4135 Zero(ri, sizeof(regexp_internal), char);
4138 /* non-zero initialization begins here */
4140 r->engine= RE_ENGINE_PTR;
4142 r->prelen = xend - exp;
4143 r->extflags = pm->op_pmflags & RXf_PMf_COMPILETIME;
4145 bool has_k = ((r->extflags & RXf_PMf_KEEPCOPY) == RXf_PMf_KEEPCOPY);
4146 bool has_minus = ((r->extflags & RXf_PMf_STD_PMMOD) != RXf_PMf_STD_PMMOD);
4147 bool has_runon = ((RExC_seen & REG_SEEN_RUN_ON_COMMENT)==REG_SEEN_RUN_ON_COMMENT);
4148 U16 reganch = (U16)((r->extflags & RXf_PMf_STD_PMMOD) >> 12);
4149 const char *fptr = STD_PAT_MODS; /*"msix"*/
4151 r->wraplen = r->prelen + has_minus + has_k + has_runon
4152 + (sizeof(STD_PAT_MODS) - 1)
4153 + (sizeof("(?:)") - 1);
4155 Newx(r->wrapped, r->wraplen, char );
4159 *p++ = KEEPCOPY_PAT_MOD; /*'k'*/
4161 char *r = p + (sizeof(STD_PAT_MODS) - 1) + has_minus - 1;
4162 char *colon = r + 1;
4165 while((ch = *fptr++)) {
4179 Copy(RExC_precomp, p, r->prelen, char);
4188 PerlIO_printf(Perl_debug_log,
4189 "RExC_precomp: %.*s\nr->precomp: %.*s\nr->wrapped:%.*s\n",
4202 r->nparens = RExC_npar - 1; /* set early to validate backrefs */
4204 if (RExC_seen & REG_SEEN_RECURSE) {
4205 Newxz(RExC_open_parens, RExC_npar,regnode *);
4206 SAVEFREEPV(RExC_open_parens);
4207 Newxz(RExC_close_parens,RExC_npar,regnode *);
4208 SAVEFREEPV(RExC_close_parens);
4211 /* Useful during FAIL. */
4212 #ifdef RE_TRACK_PATTERN_OFFSETS
4213 Newxz(ri->u.offsets, 2*RExC_size+1, U32); /* MJD 20001228 */
4214 DEBUG_OFFSETS_r(PerlIO_printf(Perl_debug_log,
4215 "%s %"UVuf" bytes for offset annotations.\n",
4216 ri->u.offsets ? "Got" : "Couldn't get",
4217 (UV)((2*RExC_size+1) * sizeof(U32))));
4219 SetProgLen(ri,RExC_size);
4223 /* Second pass: emit code. */
4224 RExC_flags = pm->op_pmflags; /* don't let top level (?i) bleed */
4229 RExC_emit_start = ri->program;
4230 RExC_emit = ri->program;
4232 /* put a sentinal on the end of the program so we can check for
4234 ri->program[RExC_size].type = 255;
4236 /* Store the count of eval-groups for security checks: */
4237 RExC_rx->seen_evals = RExC_seen_evals;
4238 REGC((U8)REG_MAGIC, (char*) RExC_emit++);
4239 if (reg(pRExC_state, 0, &flags,1) == NULL)
4242 /* XXXX To minimize changes to RE engine we always allocate
4243 3-units-long substrs field. */
4244 Newx(r->substrs, 1, struct reg_substr_data);
4245 if (RExC_recurse_count) {
4246 Newxz(RExC_recurse,RExC_recurse_count,regnode *);
4247 SAVEFREEPV(RExC_recurse);
4251 r->minlen = minlen = sawplus = sawopen = 0;
4252 Zero(r->substrs, 1, struct reg_substr_data);
4254 #ifdef TRIE_STUDY_OPT
4257 DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log,"Restudying\n"));
4259 RExC_state = copyRExC_state;
4260 if (seen & REG_TOP_LEVEL_BRANCHES)
4261 RExC_seen |= REG_TOP_LEVEL_BRANCHES;
4263 RExC_seen &= ~REG_TOP_LEVEL_BRANCHES;
4264 if (data.last_found) {
4265 SvREFCNT_dec(data.longest_fixed);
4266 SvREFCNT_dec(data.longest_float);
4267 SvREFCNT_dec(data.last_found);
4269 StructCopy(&zero_scan_data, &data, scan_data_t);
4271 StructCopy(&zero_scan_data, &data, scan_data_t);
4272 copyRExC_state = RExC_state;
4275 StructCopy(&zero_scan_data, &data, scan_data_t);
4278 /* Dig out information for optimizations. */
4279 r->extflags = pm->op_pmflags & RXf_PMf_COMPILETIME; /* Again? */
4280 pm->op_pmflags = RExC_flags;
4282 r->extflags |= RXf_UTF8; /* Unicode in it? */
4283 ri->regstclass = NULL;
4284 if (RExC_naughty >= 10) /* Probably an expensive pattern. */
4285 r->intflags |= PREGf_NAUGHTY;
4286 scan = ri->program + 1; /* First BRANCH. */
4288 /* testing for BRANCH here tells us whether there is "must appear"
4289 data in the pattern. If there is then we can use it for optimisations */
4290 if (!(RExC_seen & REG_TOP_LEVEL_BRANCHES)) { /* Only one top-level choice. */
4292 STRLEN longest_float_length, longest_fixed_length;
4293 struct regnode_charclass_class ch_class; /* pointed to by data */
4295 I32 last_close = 0; /* pointed to by data */
4298 /* Skip introductions and multiplicators >= 1. */
4299 while ((OP(first) == OPEN && (sawopen = 1)) ||
4300 /* An OR of *one* alternative - should not happen now. */
4301 (OP(first) == BRANCH && OP(regnext(first)) != BRANCH) ||
4302 /* for now we can't handle lookbehind IFMATCH*/
4303 (OP(first) == IFMATCH && !first->flags) ||
4304 (OP(first) == PLUS) ||
4305 (OP(first) == MINMOD) ||
4306 /* An {n,m} with n>0 */
4307 (PL_regkind[OP(first)] == CURLY && ARG1(first) > 0) )
4310 if (OP(first) == PLUS)
4313 first += regarglen[OP(first)];
4314 if (OP(first) == IFMATCH) {
4315 first = NEXTOPER(first);
4316 first += EXTRA_STEP_2ARGS;
4317 } else /* XXX possible optimisation for /(?=)/ */
4318 first = NEXTOPER(first);
4321 /* Starting-point info. */
4323 DEBUG_PEEP("first:",first,0);
4324 /* Ignore EXACT as we deal with it later. */
4325 if (PL_regkind[OP(first)] == EXACT) {
4326 if (OP(first) == EXACT)
4327 NOOP; /* Empty, get anchored substr later. */
4328 else if ((OP(first) == EXACTF || OP(first) == EXACTFL))
4329 ri->regstclass = first;
4332 else if (PL_regkind[OP(first)] == TRIE &&
4333 ((reg_trie_data *)ri->data->data[ ARG(first) ])->minlen>0)
4336 /* this can happen only on restudy */
4337 if ( OP(first) == TRIE ) {
4338 struct regnode_1 *trieop = (struct regnode_1 *)
4339 PerlMemShared_calloc(1, sizeof(struct regnode_1));
4340 StructCopy(first,trieop,struct regnode_1);
4341 trie_op=(regnode *)trieop;
4343 struct regnode_charclass *trieop = (struct regnode_charclass *)
4344 PerlMemShared_calloc(1, sizeof(struct regnode_charclass));
4345 StructCopy(first,trieop,struct regnode_charclass);
4346 trie_op=(regnode *)trieop;
4349 make_trie_failtable(pRExC_state, (regnode *)first, trie_op, 0);
4350 ri->regstclass = trie_op;
4353 else if (strchr((const char*)PL_simple,OP(first)))
4354 ri->regstclass = first;
4355 else if (PL_regkind[OP(first)] == BOUND ||
4356 PL_regkind[OP(first)] == NBOUND)
4357 ri->regstclass = first;
4358 else if (PL_regkind[OP(first)] == BOL) {
4359 r->extflags |= (OP(first) == MBOL
4361 : (OP(first) == SBOL
4364 first = NEXTOPER(first);
4367 else if (OP(first) == GPOS) {
4368 r->extflags |= RXf_ANCH_GPOS;
4369 first = NEXTOPER(first);
4372 else if ((!sawopen || !RExC_sawback) &&
4373 (OP(first) == STAR &&
4374 PL_regkind[OP(NEXTOPER(first))] == REG_ANY) &&
4375 !(r->extflags & RXf_ANCH) && !(RExC_seen & REG_SEEN_EVAL))
4377 /* turn .* into ^.* with an implied $*=1 */
4379 (OP(NEXTOPER(first)) == REG_ANY)
4382 r->extflags |= type;
4383 r->intflags |= PREGf_IMPLICIT;
4384 first = NEXTOPER(first);
4387 if (sawplus && (!sawopen || !RExC_sawback)
4388 && !(RExC_seen & REG_SEEN_EVAL)) /* May examine pos and $& */
4389 /* x+ must match at the 1st pos of run of x's */
4390 r->intflags |= PREGf_SKIP;
4392 /* Scan is after the zeroth branch, first is atomic matcher. */
4393 #ifdef TRIE_STUDY_OPT
4396 PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
4397 (IV)(first - scan + 1))
4401 PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
4402 (IV)(first - scan + 1))
4408 * If there's something expensive in the r.e., find the
4409 * longest literal string that must appear and make it the
4410 * regmust. Resolve ties in favor of later strings, since
4411 * the regstart check works with the beginning of the r.e.
4412 * and avoiding duplication strengthens checking. Not a
4413 * strong reason, but sufficient in the absence of others.
4414 * [Now we resolve ties in favor of the earlier string if
4415 * it happens that c_offset_min has been invalidated, since the
4416 * earlier string may buy us something the later one won't.]
4419 data.longest_fixed = newSVpvs("");
4420 data.longest_float = newSVpvs("");
4421 data.last_found = newSVpvs("");
4422 data.longest = &(data.longest_fixed);
4424 if (!ri->regstclass) {
4425 cl_init(pRExC_state, &ch_class);
4426 data.start_class = &ch_class;
4427 stclass_flag = SCF_DO_STCLASS_AND;
4428 } else /* XXXX Check for BOUND? */
4430 data.last_closep = &last_close;
4432 minlen = study_chunk(pRExC_state, &first, &minlen, &fake, scan + RExC_size, /* Up to end */
4433 &data, -1, NULL, NULL,
4434 SCF_DO_SUBSTR | SCF_WHILEM_VISITED_POS | stclass_flag,0);
4440 if ( RExC_npar == 1 && data.longest == &(data.longest_fixed)
4441 && data.last_start_min == 0 && data.last_end > 0
4442 && !RExC_seen_zerolen
4443 && !(RExC_seen & REG_SEEN_VERBARG)
4444 && (!(RExC_seen & REG_SEEN_GPOS) || (r->extflags & RXf_ANCH_GPOS)))
4445 r->extflags |= RXf_CHECK_ALL;
4446 scan_commit(pRExC_state, &data,&minlen,0);
4447 SvREFCNT_dec(data.last_found);
4449 /* Note that code very similar to this but for anchored string
4450 follows immediately below, changes may need to be made to both.
4453 longest_float_length = CHR_SVLEN(data.longest_float);
4454 if (longest_float_length
4455 || (data.flags & SF_FL_BEFORE_EOL
4456 && (!(data.flags & SF_FL_BEFORE_MEOL)
4457 || (RExC_flags & RXf_PMf_MULTILINE))))
4461 if (SvCUR(data.longest_fixed) /* ok to leave SvCUR */
4462 && data.offset_fixed == data.offset_float_min
4463 && SvCUR(data.longest_fixed) == SvCUR(data.longest_float))
4464 goto remove_float; /* As in (a)+. */
4466 /* copy the information about the longest float from the reg_scan_data
4467 over to the program. */
4468 if (SvUTF8(data.longest_float)) {
4469 r->float_utf8 = data.longest_float;
4470 r->float_substr = NULL;
4472 r->float_substr = data.longest_float;
4473 r->float_utf8 = NULL;
4475 /* float_end_shift is how many chars that must be matched that
4476 follow this item. We calculate it ahead of time as once the
4477 lookbehind offset is added in we lose the ability to correctly
4479 ml = data.minlen_float ? *(data.minlen_float)
4480 : (I32)longest_float_length;
4481 r->float_end_shift = ml - data.offset_float_min
4482 - longest_float_length + (SvTAIL(data.longest_float) != 0)
4483 + data.lookbehind_float;
4484 r->float_min_offset = data.offset_float_min - data.lookbehind_float;
4485 r->float_max_offset = data.offset_float_max;
4486 if (data.offset_float_max < I32_MAX) /* Don't offset infinity */
4487 r->float_max_offset -= data.lookbehind_float;
4489 t = (data.flags & SF_FL_BEFORE_EOL /* Can't have SEOL and MULTI */
4490 && (!(data.flags & SF_FL_BEFORE_MEOL)
4491 || (RExC_flags & RXf_PMf_MULTILINE)));
4492 fbm_compile(data.longest_float, t ? FBMcf_TAIL : 0);
4496 r->float_substr = r->float_utf8 = NULL;
4497 SvREFCNT_dec(data.longest_float);
4498 longest_float_length = 0;
4501 /* Note that code very similar to this but for floating string
4502 is immediately above, changes may need to be made to both.
4505 longest_fixed_length = CHR_SVLEN(data.longest_fixed);
4506 if (longest_fixed_length
4507 || (data.flags & SF_FIX_BEFORE_EOL /* Cannot have SEOL and MULTI */
4508 && (!(data.flags & SF_FIX_BEFORE_MEOL)
4509 || (RExC_flags & RXf_PMf_MULTILINE))))
4513 /* copy the information about the longest fixed
4514 from the reg_scan_data over to the program. */
4515 if (SvUTF8(data.longest_fixed)) {
4516 r->anchored_utf8 = data.longest_fixed;
4517 r->anchored_substr = NULL;
4519 r->anchored_substr = data.longest_fixed;
4520 r->anchored_utf8 = NULL;
4522 /* fixed_end_shift is how many chars that must be matched that
4523 follow this item. We calculate it ahead of time as once the
4524 lookbehind offset is added in we lose the ability to correctly
4526 ml = data.minlen_fixed ? *(data.minlen_fixed)
4527 : (I32)longest_fixed_length;
4528 r->anchored_end_shift = ml - data.offset_fixed
4529 - longest_fixed_length + (SvTAIL(data.longest_fixed) != 0)
4530 + data.lookbehind_fixed;
4531 r->anchored_offset = data.offset_fixed - data.lookbehind_fixed;
4533 t = (data.flags & SF_FIX_BEFORE_EOL /* Can't have SEOL and MULTI */
4534 && (!(data.flags & SF_FIX_BEFORE_MEOL)
4535 || (RExC_flags & RXf_PMf_MULTILINE)));
4536 fbm_compile(data.longest_fixed, t ? FBMcf_TAIL : 0);
4539 r->anchored_substr = r->anchored_utf8 = NULL;
4540 SvREFCNT_dec(data.longest_fixed);
4541 longest_fixed_length = 0;
4544 && (OP(ri->regstclass) == REG_ANY || OP(ri->regstclass) == SANY))
4545 ri->regstclass = NULL;
4546 if ((!(r->anchored_substr || r->anchored_utf8) || r->anchored_offset)
4548 && !(data.start_class->flags & ANYOF_EOS)
4549 && !cl_is_anything(data.start_class))
4551 const U32 n = add_data(pRExC_state, 1, "f");
4553 Newx(RExC_rxi->data->data[n], 1,
4554 struct regnode_charclass_class);
4555 StructCopy(data.start_class,
4556 (struct regnode_charclass_class*)RExC_rxi->data->data[n],
4557 struct regnode_charclass_class);
4558 ri->regstclass = (regnode*)RExC_rxi->data->data[n];
4559 r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
4560 DEBUG_COMPILE_r({ SV *sv = sv_newmortal();
4561 regprop(r, sv, (regnode*)data.start_class);
4562 PerlIO_printf(Perl_debug_log,
4563 "synthetic stclass \"%s\".\n",
4564 SvPVX_const(sv));});
4567 /* A temporary algorithm prefers floated substr to fixed one to dig more info. */
4568 if (longest_fixed_length > longest_float_length) {
4569 r->check_end_shift = r->anchored_end_shift;
4570 r->check_substr = r->anchored_substr;
4571 r->check_utf8 = r->anchored_utf8;
4572 r->check_offset_min = r->check_offset_max = r->anchored_offset;
4573 if (r->extflags & RXf_ANCH_SINGLE)
4574 r->extflags |= RXf_NOSCAN;
4577 r->check_end_shift = r->float_end_shift;
4578 r->check_substr = r->float_substr;
4579 r->check_utf8 = r->float_utf8;
4580 r->check_offset_min = r->float_min_offset;
4581 r->check_offset_max = r->float_max_offset;
4583 /* XXXX Currently intuiting is not compatible with ANCH_GPOS.
4584 This should be changed ASAP! */
4585 if ((r->check_substr || r->check_utf8) && !(r->extflags & RXf_ANCH_GPOS)) {
4586 r->extflags |= RXf_USE_INTUIT;
4587 if (SvTAIL(r->check_substr ? r->check_substr : r->check_utf8))
4588 r->extflags |= RXf_INTUIT_TAIL;
4590 /* XXX Unneeded? dmq (shouldn't as this is handled elsewhere)
4591 if ( (STRLEN)minlen < longest_float_length )
4592 minlen= longest_float_length;
4593 if ( (STRLEN)minlen < longest_fixed_length )
4594 minlen= longest_fixed_length;
4598 /* Several toplevels. Best we can is to set minlen. */
4600 struct regnode_charclass_class ch_class;
4603 DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log, "\nMulti Top Level\n"));
4605 scan = ri->program + 1;
4606 cl_init(pRExC_state, &ch_class);
4607 data.start_class = &ch_class;
4608 data.last_closep = &last_close;
4611 minlen = study_chunk(pRExC_state, &scan, &minlen, &fake, scan + RExC_size,
4612 &data, -1, NULL, NULL, SCF_DO_STCLASS_AND|SCF_WHILEM_VISITED_POS,0);
4616 r->check_substr = r->check_utf8 = r->anchored_substr = r->anchored_utf8
4617 = r->float_substr = r->float_utf8 = NULL;
4618 if (!(data.start_class->flags & ANYOF_EOS)
4619 && !cl_is_anything(data.start_class))
4621 const U32 n = add_data(pRExC_state, 1, "f");
4623 Newx(RExC_rxi->data->data[n], 1,
4624 struct regnode_charclass_class);
4625 StructCopy(data.start_class,
4626 (struct regnode_charclass_class*)RExC_rxi->data->data[n],
4627 struct regnode_charclass_class);
4628 ri->regstclass = (regnode*)RExC_rxi->data->data[n];
4629 r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
4630 DEBUG_COMPILE_r({ SV* sv = sv_newmortal();
4631 regprop(r, sv, (regnode*)data.start_class);
4632 PerlIO_printf(Perl_debug_log,
4633 "synthetic stclass \"%s\".\n",
4634 SvPVX_const(sv));});
4638 /* Guard against an embedded (?=) or (?<=) with a longer minlen than
4639 the "real" pattern. */
4641 PerlIO_printf(Perl_debug_log,"minlen: %"IVdf" r->minlen:%"IVdf"\n",
4642 (IV)minlen, (IV)r->minlen);
4644 r->minlenret = minlen;
4645 if (r->minlen < minlen)
4648 if (RExC_seen & REG_SEEN_GPOS)
4649 r->extflags |= RXf_GPOS_SEEN;
4650 if (RExC_seen & REG_SEEN_LOOKBEHIND)
4651 r->extflags |= RXf_LOOKBEHIND_SEEN;
4652 if (RExC_seen & REG_SEEN_EVAL)
4653 r->extflags |= RXf_EVAL_SEEN;
4654 if (RExC_seen & REG_SEEN_CANY)
4655 r->extflags |= RXf_CANY_SEEN;
4656 if (RExC_seen & REG_SEEN_VERBARG)
4657 r->intflags |= PREGf_VERBARG_SEEN;
4658 if (RExC_seen & REG_SEEN_CUTGROUP)
4659 r->intflags |= PREGf_CUTGROUP_SEEN;
4660 if (RExC_paren_names)
4661 r->paren_names = (HV*)SvREFCNT_inc(RExC_paren_names);
4663 r->paren_names = NULL;
4664 if (r->prelen == 3 && strEQ("\\s+", r->precomp))
4665 r->extflags |= RXf_WHITE;
4666 else if (r->prelen == 1 && r->precomp[0] == '^')
4667 r->extflags |= RXf_START_ONLY;
4670 if (RExC_paren_names) {
4671 ri->name_list_idx = add_data( pRExC_state, 1, "p" );
4672 ri->data->data[ri->name_list_idx] = (void*)SvREFCNT_inc(RExC_paren_name_list);
4675 ri->name_list_idx = 0;
4677 if (RExC_recurse_count) {
4678 for ( ; RExC_recurse_count ; RExC_recurse_count-- ) {
4679 const regnode *scan = RExC_recurse[RExC_recurse_count-1];
4680 ARG2L_SET( scan, RExC_open_parens[ARG(scan)-1] - scan );
4683 Newxz(r->startp, RExC_npar, I32);
4684 Newxz(r->endp, RExC_npar, I32);
4685 /* assume we don't need to swap parens around before we match */
4688 PerlIO_printf(Perl_debug_log,"Final program:\n");
4691 #ifdef RE_TRACK_PATTERN_OFFSETS
4692 DEBUG_OFFSETS_r(if (ri->u.offsets) {
4693 const U32 len = ri->u.offsets[0];
4695 GET_RE_DEBUG_FLAGS_DECL;
4696 PerlIO_printf(Perl_debug_log, "Offsets: [%"UVuf"]\n\t", (UV)ri->u.offsets[0]);
4697 for (i = 1; i <= len; i++) {
4698 if (ri->u.offsets[i*2-1] || ri->u.offsets[i*2])
4699 PerlIO_printf(Perl_debug_log, "%"UVuf":%"UVuf"[%"UVuf"] ",
4700 (UV)i, (UV)ri->u.offsets[i*2-1], (UV)ri->u.offsets[i*2]);
4702 PerlIO_printf(Perl_debug_log, "\n");
4708 #undef CORE_ONLY_BLOCK
4709 #undef RE_ENGINE_PTR
4711 #ifndef PERL_IN_XSUB_RE
4713 Perl_reg_named_buff_get(pTHX_ SV* namesv, const REGEXP * const from_re, U32 flags)
4715 AV *retarray = NULL;
4720 if (from_re || PL_curpm) {
4721 const REGEXP * const rx = from_re ? from_re : PM_GETRE(PL_curpm);
4722 if (rx && rx->paren_names) {
4723 HE *he_str = hv_fetch_ent( rx->paren_names, namesv, 0, 0 );
4726 SV* sv_dat=HeVAL(he_str);
4727 I32 *nums=(I32*)SvPVX(sv_dat);
4728 for ( i=0; i<SvIVX(sv_dat); i++ ) {
4729 if ((I32)(rx->nparens) >= nums[i]
4730 && rx->startp[nums[i]] != -1
4731 && rx->endp[nums[i]] != -1)
4733 ret = reg_numbered_buff_get(nums[i],rx,NULL,0);
4737 ret = newSVsv(&PL_sv_undef);
4741 av_push(retarray, ret);
4745 return (SV*)retarray;
4753 Perl_reg_numbered_buff_get(pTHX_ I32 paren, const REGEXP * const rx, SV* usesv, U32 flags)
4758 SV *sv = usesv ? usesv : newSVpvs("");
4759 PERL_UNUSED_ARG(flags);
4762 sv_setsv(sv,&PL_sv_undef);
4766 if (paren == -2 && rx->startp[0] != -1) {
4772 if (paren == -1 && rx->endp[0] != -1) {
4774 s = rx->subbeg + rx->endp[0];
4775 i = rx->sublen - rx->endp[0];
4778 if ( 0 <= paren && paren <= (I32)rx->nparens &&
4779 (s1 = rx->startp[paren]) != -1 &&
4780 (t1 = rx->endp[paren]) != -1)
4784 s = rx->subbeg + s1;
4786 sv_setsv(sv,&PL_sv_undef);
4789 assert(rx->sublen >= (s - rx->subbeg) + i );
4791 const int oldtainted = PL_tainted;
4793 sv_setpvn(sv, s, i);
4794 PL_tainted = oldtainted;
4795 if ( (rx->extflags & RXf_CANY_SEEN)
4796 ? (RX_MATCH_UTF8(rx)
4797 && (!i || is_utf8_string((U8*)s, i)))
4798 : (RX_MATCH_UTF8(rx)) )
4805 if (RX_MATCH_TAINTED(rx)) {
4806 if (SvTYPE(sv) >= SVt_PVMG) {
4807 MAGIC* const mg = SvMAGIC(sv);
4810 SvMAGIC_set(sv, mg->mg_moremagic);
4812 if ((mgt = SvMAGIC(sv))) {
4813 mg->mg_moremagic = mgt;
4814 SvMAGIC_set(sv, mg);
4824 sv_setsv(sv,&PL_sv_undef);
4830 /* Scans the name of a named buffer from the pattern.
4831 * If flags is REG_RSN_RETURN_NULL returns null.
4832 * If flags is REG_RSN_RETURN_NAME returns an SV* containing the name
4833 * If flags is REG_RSN_RETURN_DATA returns the data SV* corresponding
4834 * to the parsed name as looked up in the RExC_paren_names hash.
4835 * If there is an error throws a vFAIL().. type exception.
4838 #define REG_RSN_RETURN_NULL 0
4839 #define REG_RSN_RETURN_NAME 1
4840 #define REG_RSN_RETURN_DATA 2
4843 S_reg_scan_name(pTHX_ RExC_state_t *pRExC_state, U32 flags) {
4844 char *name_start = RExC_parse;
4846 if (isIDFIRST_lazy_if(RExC_parse, UTF)) {
4847 /* skip IDFIRST by using do...while */
4850 RExC_parse += UTF8SKIP(RExC_parse);
4851 } while (isALNUM_utf8((U8*)RExC_parse));
4855 } while (isALNUM(*RExC_parse));
4859 SV* sv_name = sv_2mortal(Perl_newSVpvn(aTHX_ name_start,
4860 (int)(RExC_parse - name_start)));
4863 if ( flags == REG_RSN_RETURN_NAME)
4865 else if (flags==REG_RSN_RETURN_DATA) {
4868 if ( ! sv_name ) /* should not happen*/
4869 Perl_croak(aTHX_ "panic: no svname in reg_scan_name");
4870 if (RExC_paren_names)
4871 he_str = hv_fetch_ent( RExC_paren_names, sv_name, 0, 0 );
4873 sv_dat = HeVAL(he_str);
4875 vFAIL("Reference to nonexistent named group");
4879 Perl_croak(aTHX_ "panic: bad flag in reg_scan_name");
4886 #define DEBUG_PARSE_MSG(funcname) DEBUG_PARSE_r({ \
4887 int rem=(int)(RExC_end - RExC_parse); \
4896 if (RExC_lastparse!=RExC_parse) \
4897 PerlIO_printf(Perl_debug_log," >%.*s%-*s", \
4900 iscut ? "..." : "<" \
4903 PerlIO_printf(Perl_debug_log,"%16s",""); \
4908 num=REG_NODE_NUM(RExC_emit); \
4909 if (RExC_lastnum!=num) \
4910 PerlIO_printf(Perl_debug_log,"|%4d",num); \
4912 PerlIO_printf(Perl_debug_log,"|%4s",""); \
4913 PerlIO_printf(Perl_debug_log,"|%*s%-4s", \
4914 (int)((depth*2)), "", \
4918 RExC_lastparse=RExC_parse; \
4923 #define DEBUG_PARSE(funcname) DEBUG_PARSE_r({ \
4924 DEBUG_PARSE_MSG((funcname)); \
4925 PerlIO_printf(Perl_debug_log,"%4s","\n"); \
4927 #define DEBUG_PARSE_FMT(funcname,fmt,args) DEBUG_PARSE_r({ \
4928 DEBUG_PARSE_MSG((funcname)); \
4929 PerlIO_printf(Perl_debug_log,fmt "\n",args); \
4932 - reg - regular expression, i.e. main body or parenthesized thing
4934 * Caller must absorb opening parenthesis.
4936 * Combining parenthesis handling with the base level of regular expression
4937 * is a trifle forced, but the need to tie the tails of the branches to what
4938 * follows makes it hard to avoid.
4940 #define REGTAIL(x,y,z) regtail((x),(y),(z),depth+1)
4942 #define REGTAIL_STUDY(x,y,z) regtail_study((x),(y),(z),depth+1)
4944 #define REGTAIL_STUDY(x,y,z) regtail((x),(y),(z),depth+1)
4947 /* this idea is borrowed from STR_WITH_LEN in handy.h */
4948 #define CHECK_WORD(s,v,l) \
4949 (((sizeof(s)-1)==(l)) && (strnEQ(start_verb, (s ""), (sizeof(s)-1))))
4952 S_reg(pTHX_ RExC_state_t *pRExC_state, I32 paren, I32 *flagp,U32 depth)
4953 /* paren: Parenthesized? 0=top, 1=(, inside: changed to letter. */
4956 register regnode *ret; /* Will be the head of the group. */
4957 register regnode *br;
4958 register regnode *lastbr;
4959 register regnode *ender = NULL;
4960 register I32 parno = 0;
4962 const I32 oregflags = RExC_flags;
4963 bool have_branch = 0;
4965 I32 freeze_paren = 0;
4966 I32 after_freeze = 0;
4968 /* for (?g), (?gc), and (?o) warnings; warning
4969 about (?c) will warn about (?g) -- japhy */
4971 #define WASTED_O 0x01
4972 #define WASTED_G 0x02
4973 #define WASTED_C 0x04
4974 #define WASTED_GC (0x02|0x04)
4975 I32 wastedflags = 0x00;
4977 char * parse_start = RExC_parse; /* MJD */
4978 char * const oregcomp_parse = RExC_parse;
4980 GET_RE_DEBUG_FLAGS_DECL;
4981 DEBUG_PARSE("reg ");
4984 *flagp = 0; /* Tentatively. */
4987 /* Make an OPEN node, if parenthesized. */
4989 if ( *RExC_parse == '*') { /* (*VERB:ARG) */
4990 char *start_verb = RExC_parse;
4991 STRLEN verb_len = 0;
4992 char *start_arg = NULL;
4993 unsigned char op = 0;
4995 int internal_argval = 0; /* internal_argval is only useful if !argok */
4996 while ( *RExC_parse && *RExC_parse != ')' ) {
4997 if ( *RExC_parse == ':' ) {
4998 start_arg = RExC_parse + 1;
5004 verb_len = RExC_parse - start_verb;
5007 while ( *RExC_parse && *RExC_parse != ')' )
5009 if ( *RExC_parse != ')' )
5010 vFAIL("Unterminated verb pattern argument");
5011 if ( RExC_parse == start_arg )
5014 if ( *RExC_parse != ')' )
5015 vFAIL("Unterminated verb pattern");
5018 switch ( *start_verb ) {
5019 case 'A': /* (*ACCEPT) */
5020 if ( CHECK_WORD("ACCEPT",start_verb,verb_len) ) {
5022 internal_argval = RExC_nestroot;
5025 case 'C': /* (*COMMIT) */
5026 if ( CHECK_WORD("COMMIT",start_verb,verb_len) )
5029 case 'F': /* (*FAIL) */
5030 if ( verb_len==1 || CHECK_WORD("FAIL",start_verb,verb_len) ) {
5035 case ':': /* (*:NAME) */
5036 case 'M': /* (*MARK:NAME) */
5037 if ( verb_len==0 || CHECK_WORD("MARK",start_verb,verb_len) ) {
5042 case 'P': /* (*PRUNE) */
5043 if ( CHECK_WORD("PRUNE",start_verb,verb_len) )
5046 case 'S': /* (*SKIP) */
5047 if ( CHECK_WORD("SKIP",start_verb,verb_len) )
5050 case 'T': /* (*THEN) */
5051 /* [19:06] <TimToady> :: is then */
5052 if ( CHECK_WORD("THEN",start_verb,verb_len) ) {
5054 RExC_seen |= REG_SEEN_CUTGROUP;
5060 vFAIL3("Unknown verb pattern '%.*s'",
5061 verb_len, start_verb);
5064 if ( start_arg && internal_argval ) {
5065 vFAIL3("Verb pattern '%.*s' may not have an argument",
5066 verb_len, start_verb);
5067 } else if ( argok < 0 && !start_arg ) {
5068 vFAIL3("Verb pattern '%.*s' has a mandatory argument",
5069 verb_len, start_verb);
5071 ret = reganode(pRExC_state, op, internal_argval);
5072 if ( ! internal_argval && ! SIZE_ONLY ) {
5074 SV *sv = newSVpvn( start_arg, RExC_parse - start_arg);
5075 ARG(ret) = add_data( pRExC_state, 1, "S" );
5076 RExC_rxi->data->data[ARG(ret)]=(void*)sv;
5083 if (!internal_argval)
5084 RExC_seen |= REG_SEEN_VERBARG;
5085 } else if ( start_arg ) {
5086 vFAIL3("Verb pattern '%.*s' may not have an argument",
5087 verb_len, start_verb);
5089 ret = reg_node(pRExC_state, op);
5091 nextchar(pRExC_state);
5094 if (*RExC_parse == '?') { /* (?...) */
5095 bool is_logical = 0;
5096 const char * const seqstart = RExC_parse;
5099 paren = *RExC_parse++;
5100 ret = NULL; /* For look-ahead/behind. */
5103 case 'P': /* (?P...) variants for those used to PCRE/Python */
5104 paren = *RExC_parse++;
5105 if ( paren == '<') /* (?P<...>) named capture */
5107 else if (paren == '>') { /* (?P>name) named recursion */
5108 goto named_recursion;
5110 else if (paren == '=') { /* (?P=...) named backref */
5111 /* this pretty much dupes the code for \k<NAME> in regatom(), if
5112 you change this make sure you change that */
5113 char* name_start = RExC_parse;
5115 SV *sv_dat = reg_scan_name(pRExC_state,
5116 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5117 if (RExC_parse == name_start || *RExC_parse != ')')
5118 vFAIL2("Sequence %.3s... not terminated",parse_start);
5121 num = add_data( pRExC_state, 1, "S" );
5122 RExC_rxi->data->data[num]=(void*)sv_dat;
5123 SvREFCNT_inc(sv_dat);
5126 ret = reganode(pRExC_state,
5127 (U8)(FOLD ? (LOC ? NREFFL : NREFF) : NREF),
5131 Set_Node_Offset(ret, parse_start+1);
5132 Set_Node_Cur_Length(ret); /* MJD */
5134 nextchar(pRExC_state);
5138 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5140 case '<': /* (?<...) */
5141 if (*RExC_parse == '!')
5143 else if (*RExC_parse != '=')
5149 case '\'': /* (?'...') */
5150 name_start= RExC_parse;
5151 svname = reg_scan_name(pRExC_state,
5152 SIZE_ONLY ? /* reverse test from the others */
5153 REG_RSN_RETURN_NAME :
5154 REG_RSN_RETURN_NULL);
5155 if (RExC_parse == name_start) {
5157 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5160 if (*RExC_parse != paren)
5161 vFAIL2("Sequence (?%c... not terminated",
5162 paren=='>' ? '<' : paren);
5166 if (!svname) /* shouldnt happen */
5168 "panic: reg_scan_name returned NULL");
5169 if (!RExC_paren_names) {
5170 RExC_paren_names= newHV();
5171 sv_2mortal((SV*)RExC_paren_names);
5173 RExC_paren_name_list= newAV();
5174 sv_2mortal((SV*)RExC_paren_name_list);
5177 he_str = hv_fetch_ent( RExC_paren_names, svname, 1, 0 );
5179 sv_dat = HeVAL(he_str);
5181 /* croak baby croak */
5183 "panic: paren_name hash element allocation failed");
5184 } else if ( SvPOK(sv_dat) ) {
5185 IV count=SvIV(sv_dat);
5186 I32 *pv=(I32*)SvGROW(sv_dat,SvCUR(sv_dat)+sizeof(I32)+1);
5187 SvCUR_set(sv_dat,SvCUR(sv_dat)+sizeof(I32));
5188 pv[count]=RExC_npar;
5191 (void)SvUPGRADE(sv_dat,SVt_PVNV);
5192 sv_setpvn(sv_dat, (char *)&(RExC_npar), sizeof(I32));
5197 if (!av_store(RExC_paren_name_list, RExC_npar, SvREFCNT_inc(svname)))
5198 SvREFCNT_dec(svname);
5201 /*sv_dump(sv_dat);*/
5203 nextchar(pRExC_state);
5205 goto capturing_parens;
5207 RExC_seen |= REG_SEEN_LOOKBEHIND;
5209 case '=': /* (?=...) */
5210 case '!': /* (?!...) */
5211 RExC_seen_zerolen++;
5212 if (*RExC_parse == ')') {
5213 ret=reg_node(pRExC_state, OPFAIL);
5214 nextchar(pRExC_state);
5218 case '|': /* (?|...) */
5219 /* branch reset, behave like a (?:...) except that
5220 buffers in alternations share the same numbers */
5222 after_freeze = freeze_paren = RExC_npar;
5224 case ':': /* (?:...) */
5225 case '>': /* (?>...) */
5227 case '$': /* (?$...) */
5228 case '@': /* (?@...) */
5229 vFAIL2("Sequence (?%c...) not implemented", (int)paren);
5231 case '#': /* (?#...) */
5232 while (*RExC_parse && *RExC_parse != ')')
5234 if (*RExC_parse != ')')
5235 FAIL("Sequence (?#... not terminated");
5236 nextchar(pRExC_state);
5239 case '0' : /* (?0) */
5240 case 'R' : /* (?R) */
5241 if (*RExC_parse != ')')
5242 FAIL("Sequence (?R) not terminated");
5243 ret = reg_node(pRExC_state, GOSTART);
5244 nextchar(pRExC_state);
5247 { /* named and numeric backreferences */
5249 case '&': /* (?&NAME) */
5250 parse_start = RExC_parse - 1;
5253 SV *sv_dat = reg_scan_name(pRExC_state,
5254 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5255 num = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
5257 goto gen_recurse_regop;
5260 if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
5262 vFAIL("Illegal pattern");
5264 goto parse_recursion;
5266 case '-': /* (?-1) */
5267 if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
5268 RExC_parse--; /* rewind to let it be handled later */
5272 case '1': case '2': case '3': case '4': /* (?1) */
5273 case '5': case '6': case '7': case '8': case '9':
5276 num = atoi(RExC_parse);
5277 parse_start = RExC_parse - 1; /* MJD */
5278 if (*RExC_parse == '-')
5280 while (isDIGIT(*RExC_parse))
5282 if (*RExC_parse!=')')
5283 vFAIL("Expecting close bracket");
5286 if ( paren == '-' ) {
5288 Diagram of capture buffer numbering.
5289 Top line is the normal capture buffer numbers
5290 Botton line is the negative indexing as from
5294 /(a(x)y)(a(b(c(?-2)d)e)f)(g(h))/
5298 num = RExC_npar + num;
5301 vFAIL("Reference to nonexistent group");
5303 } else if ( paren == '+' ) {
5304 num = RExC_npar + num - 1;
5307 ret = reganode(pRExC_state, GOSUB, num);
5309 if (num > (I32)RExC_rx->nparens) {
5311 vFAIL("Reference to nonexistent group");
5313 ARG2L_SET( ret, RExC_recurse_count++);
5315 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
5316 "Recurse #%"UVuf" to %"IVdf"\n", (UV)ARG(ret), (IV)ARG2L(ret)));
5320 RExC_seen |= REG_SEEN_RECURSE;
5321 Set_Node_Length(ret, 1 + regarglen[OP(ret)]); /* MJD */
5322 Set_Node_Offset(ret, parse_start); /* MJD */
5324 nextchar(pRExC_state);
5326 } /* named and numeric backreferences */
5329 case 'p': /* (?p...) */
5330 if (SIZE_ONLY && ckWARN2(WARN_DEPRECATED, WARN_REGEXP))
5331 vWARNdep(RExC_parse, "(?p{}) is deprecated - use (??{})");
5333 case '?': /* (??...) */
5335 if (*RExC_parse != '{') {
5337 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5340 paren = *RExC_parse++;
5342 case '{': /* (?{...}) */
5347 char *s = RExC_parse;
5349 RExC_seen_zerolen++;
5350 RExC_seen |= REG_SEEN_EVAL;
5351 while (count && (c = *RExC_parse)) {
5362 if (*RExC_parse != ')') {
5364 vFAIL("Sequence (?{...}) not terminated or not {}-balanced");
5368 OP_4tree *sop, *rop;
5369 SV * const sv = newSVpvn(s, RExC_parse - 1 - s);
5372 Perl_save_re_context(aTHX);
5373 rop = sv_compile_2op(sv, &sop, "re", &pad);
5374 sop->op_private |= OPpREFCOUNTED;
5375 /* re_dup will OpREFCNT_inc */
5376 OpREFCNT_set(sop, 1);
5379 n = add_data(pRExC_state, 3, "nop");
5380 RExC_rxi->data->data[n] = (void*)rop;
5381 RExC_rxi->data->data[n+1] = (void*)sop;
5382 RExC_rxi->data->data[n+2] = (void*)pad;
5385 else { /* First pass */
5386 if (PL_reginterp_cnt < ++RExC_seen_evals
5388 /* No compiled RE interpolated, has runtime
5389 components ===> unsafe. */
5390 FAIL("Eval-group not allowed at runtime, use re 'eval'");
5391 if (PL_tainting && PL_tainted)
5392 FAIL("Eval-group in insecure regular expression");
5393 #if PERL_VERSION > 8
5394 if (IN_PERL_COMPILETIME)
5399 nextchar(pRExC_state);
5401 ret = reg_node(pRExC_state, LOGICAL);
5404 REGTAIL(pRExC_state, ret, reganode(pRExC_state, EVAL, n));
5405 /* deal with the length of this later - MJD */
5408 ret = reganode(pRExC_state, EVAL, n);
5409 Set_Node_Length(ret, RExC_parse - parse_start + 1);
5410 Set_Node_Offset(ret, parse_start);
5413 case '(': /* (?(?{...})...) and (?(?=...)...) */
5416 if (RExC_parse[0] == '?') { /* (?(?...)) */
5417 if (RExC_parse[1] == '=' || RExC_parse[1] == '!'
5418 || RExC_parse[1] == '<'
5419 || RExC_parse[1] == '{') { /* Lookahead or eval. */
5422 ret = reg_node(pRExC_state, LOGICAL);
5425 REGTAIL(pRExC_state, ret, reg(pRExC_state, 1, &flag,depth+1));
5429 else if ( RExC_parse[0] == '<' /* (?(<NAME>)...) */
5430 || RExC_parse[0] == '\'' ) /* (?('NAME')...) */
5432 char ch = RExC_parse[0] == '<' ? '>' : '\'';
5433 char *name_start= RExC_parse++;
5435 SV *sv_dat=reg_scan_name(pRExC_state,
5436 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5437 if (RExC_parse == name_start || *RExC_parse != ch)
5438 vFAIL2("Sequence (?(%c... not terminated",
5439 (ch == '>' ? '<' : ch));
5442 num = add_data( pRExC_state, 1, "S" );
5443 RExC_rxi->data->data[num]=(void*)sv_dat;
5444 SvREFCNT_inc(sv_dat);
5446 ret = reganode(pRExC_state,NGROUPP,num);
5447 goto insert_if_check_paren;
5449 else if (RExC_parse[0] == 'D' &&
5450 RExC_parse[1] == 'E' &&
5451 RExC_parse[2] == 'F' &&
5452 RExC_parse[3] == 'I' &&
5453 RExC_parse[4] == 'N' &&
5454 RExC_parse[5] == 'E')
5456 ret = reganode(pRExC_state,DEFINEP,0);
5459 goto insert_if_check_paren;
5461 else if (RExC_parse[0] == 'R') {
5464 if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
5465 parno = atoi(RExC_parse++);
5466 while (isDIGIT(*RExC_parse))
5468 } else if (RExC_parse[0] == '&') {
5471 sv_dat = reg_scan_name(pRExC_state,
5472 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
5473 parno = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
5475 ret = reganode(pRExC_state,INSUBP,parno);
5476 goto insert_if_check_paren;
5478 else if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
5481 parno = atoi(RExC_parse++);
5483 while (isDIGIT(*RExC_parse))
5485 ret = reganode(pRExC_state, GROUPP, parno);
5487 insert_if_check_paren:
5488 if ((c = *nextchar(pRExC_state)) != ')')
5489 vFAIL("Switch condition not recognized");
5491 REGTAIL(pRExC_state, ret, reganode(pRExC_state, IFTHEN, 0));
5492 br = regbranch(pRExC_state, &flags, 1,depth+1);
5494 br = reganode(pRExC_state, LONGJMP, 0);
5496 REGTAIL(pRExC_state, br, reganode(pRExC_state, LONGJMP, 0));
5497 c = *nextchar(pRExC_state);
5502 vFAIL("(?(DEFINE)....) does not allow branches");
5503 lastbr = reganode(pRExC_state, IFTHEN, 0); /* Fake one for optimizer. */
5504 regbranch(pRExC_state, &flags, 1,depth+1);
5505 REGTAIL(pRExC_state, ret, lastbr);
5508 c = *nextchar(pRExC_state);
5513 vFAIL("Switch (?(condition)... contains too many branches");
5514 ender = reg_node(pRExC_state, TAIL);
5515 REGTAIL(pRExC_state, br, ender);
5517 REGTAIL(pRExC_state, lastbr, ender);
5518 REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender);
5521 REGTAIL(pRExC_state, ret, ender);
5525 vFAIL2("Unknown switch condition (?(%.2s", RExC_parse);
5529 RExC_parse--; /* for vFAIL to print correctly */
5530 vFAIL("Sequence (? incomplete");
5534 parse_flags: /* (?i) */
5536 U32 posflags = 0, negflags = 0;
5537 U32 *flagsp = &posflags;
5539 while (*RExC_parse) {
5540 /* && strchr("iogcmsx", *RExC_parse) */
5541 /* (?g), (?gc) and (?o) are useless here
5542 and must be globally applied -- japhy */
5543 switch (*RExC_parse) {
5544 CASE_STD_PMMOD_FLAGS_PARSE_SET(flagsp);
5547 if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
5548 const I32 wflagbit = *RExC_parse == 'o' ? WASTED_O : WASTED_G;
5549 if (! (wastedflags & wflagbit) ) {
5550 wastedflags |= wflagbit;
5553 "Useless (%s%c) - %suse /%c modifier",
5554 flagsp == &negflags ? "?-" : "?",
5556 flagsp == &negflags ? "don't " : "",
5564 if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
5565 if (! (wastedflags & WASTED_C) ) {
5566 wastedflags |= WASTED_GC;
5569 "Useless (%sc) - %suse /gc modifier",
5570 flagsp == &negflags ? "?-" : "?",
5571 flagsp == &negflags ? "don't " : ""
5577 if (flagsp == &negflags) {
5578 if (SIZE_ONLY && ckWARN(WARN_REGEXP))
5579 vWARN(RExC_parse + 1,"Useless use of (?-k)");
5581 *flagsp |= RXf_PMf_KEEPCOPY;
5585 if (flagsp == &negflags) {
5587 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5591 wastedflags = 0; /* reset so (?g-c) warns twice */
5597 RExC_flags |= posflags;
5598 RExC_flags &= ~negflags;
5599 nextchar(pRExC_state);
5610 vFAIL3("Sequence (%.*s...) not recognized", RExC_parse-seqstart, seqstart);
5615 }} /* one for the default block, one for the switch */
5622 ret = reganode(pRExC_state, OPEN, parno);
5625 RExC_nestroot = parno;
5626 if (RExC_seen & REG_SEEN_RECURSE) {
5627 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
5628 "Setting open paren #%"IVdf" to %d\n",
5629 (IV)parno, REG_NODE_NUM(ret)));
5630 RExC_open_parens[parno-1]= ret;
5633 Set_Node_Length(ret, 1); /* MJD */
5634 Set_Node_Offset(ret, RExC_parse); /* MJD */
5642 /* Pick up the branches, linking them together. */
5643 parse_start = RExC_parse; /* MJD */
5644 br = regbranch(pRExC_state, &flags, 1,depth+1);
5645 /* branch_len = (paren != 0); */
5649 if (*RExC_parse == '|') {
5650 if (!SIZE_ONLY && RExC_extralen) {
5651 reginsert(pRExC_state, BRANCHJ, br, depth+1);
5654 reginsert(pRExC_state, BRANCH, br, depth+1);
5655 Set_Node_Length(br, paren != 0);
5656 Set_Node_Offset_To_R(br-RExC_emit_start, parse_start-RExC_start);
5660 RExC_extralen += 1; /* For BRANCHJ-BRANCH. */
5662 else if (paren == ':') {
5663 *flagp |= flags&SIMPLE;
5665 if (is_open) { /* Starts with OPEN. */
5666 REGTAIL(pRExC_state, ret, br); /* OPEN -> first. */
5668 else if (paren != '?') /* Not Conditional */
5670 *flagp |= flags & (SPSTART | HASWIDTH);
5672 while (*RExC_parse == '|') {
5673 if (!SIZE_ONLY && RExC_extralen) {
5674 ender = reganode(pRExC_state, LONGJMP,0);
5675 REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender); /* Append to the previous. */
5678 RExC_extralen += 2; /* Account for LONGJMP. */
5679 nextchar(pRExC_state);
5681 if (RExC_npar > after_freeze)
5682 after_freeze = RExC_npar;
5683 RExC_npar = freeze_paren;
5685 br = regbranch(pRExC_state, &flags, 0, depth+1);
5689 REGTAIL(pRExC_state, lastbr, br); /* BRANCH -> BRANCH. */
5693 *flagp |= flags&SPSTART;
5696 if (have_branch || paren != ':') {
5697 /* Make a closing node, and hook it on the end. */
5700 ender = reg_node(pRExC_state, TAIL);
5703 ender = reganode(pRExC_state, CLOSE, parno);
5704 if (!SIZE_ONLY && RExC_seen & REG_SEEN_RECURSE) {
5705 DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
5706 "Setting close paren #%"IVdf" to %d\n",
5707 (IV)parno, REG_NODE_NUM(ender)));
5708 RExC_close_parens[parno-1]= ender;
5709 if (RExC_nestroot == parno)
5712 Set_Node_Offset(ender,RExC_parse+1); /* MJD */
5713 Set_Node_Length(ender,1); /* MJD */
5719 *flagp &= ~HASWIDTH;
5722 ender = reg_node(pRExC_state, SUCCEED);
5725 ender = reg_node(pRExC_state, END);
5727 assert(!RExC_opend); /* there can only be one! */
5732 REGTAIL(pRExC_state, lastbr, ender);
5734 if (have_branch && !SIZE_ONLY) {
5736 RExC_seen |= REG_TOP_LEVEL_BRANCHES;
5738 /* Hook the tails of the branches to the closing node. */
5739 for (br = ret; br; br = regnext(br)) {
5740 const U8 op = PL_regkind[OP(br)];
5742 REGTAIL_STUDY(pRExC_state, NEXTOPER(br), ender);
5744 else if (op == BRANCHJ) {
5745 REGTAIL_STUDY(pRExC_state, NEXTOPER(NEXTOPER(br)), ender);
5753 static const char parens[] = "=!<,>";
5755 if (paren && (p = strchr(parens, paren))) {
5756 U8 node = ((p - parens) % 2) ? UNLESSM : IFMATCH;
5757 int flag = (p - parens) > 1;
5760 node = SUSPEND, flag = 0;
5761 reginsert(pRExC_state, node,ret, depth+1);
5762 Set_Node_Cur_Length(ret);
5763 Set_Node_Offset(ret, parse_start + 1);
5765 REGTAIL_STUDY(pRExC_state, ret, reg_node(pRExC_state, TAIL));
5769 /* Check for proper termination. */
5771 RExC_flags = oregflags;
5772 if (RExC_parse >= RExC_end || *nextchar(pRExC_state) != ')') {
5773 RExC_parse = oregcomp_parse;
5774 vFAIL("Unmatched (");
5777 else if (!paren && RExC_parse < RExC_end) {
5778 if (*RExC_parse == ')') {
5780 vFAIL("Unmatched )");
5783 FAIL("Junk on end of regexp"); /* "Can't happen". */
5787 RExC_npar = after_freeze;
5792 - regbranch - one alternative of an | operator
5794 * Implements the concatenation operator.
5797 S_regbranch(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, I32 first, U32 depth)
5800 register regnode *ret;
5801 register regnode *chain = NULL;
5802 register regnode *latest;
5803 I32 flags = 0, c = 0;
5804 GET_RE_DEBUG_FLAGS_DECL;
5805 DEBUG_PARSE("brnc");
5809 if (!SIZE_ONLY && RExC_extralen)
5810 ret = reganode(pRExC_state, BRANCHJ,0);
5812 ret = reg_node(pRExC_state, BRANCH);
5813 Set_Node_Length(ret, 1);
5817 if (!first && SIZE_ONLY)
5818 RExC_extralen += 1; /* BRANCHJ */
5820 *flagp = WORST; /* Tentatively. */
5823 nextchar(pRExC_state);
5824 while (RExC_parse < RExC_end && *RExC_parse != '|' && *RExC_parse != ')') {
5826 latest = regpiece(pRExC_state, &flags,depth+1);
5827 if (latest == NULL) {
5828 if (flags & TRYAGAIN)
5832 else if (ret == NULL)
5834 *flagp |= flags&HASWIDTH;
5835 if (chain == NULL) /* First piece. */
5836 *flagp |= flags&SPSTART;
5839 REGTAIL(pRExC_state, chain, latest);
5844 if (chain == NULL) { /* Loop ran zero times. */
5845 chain = reg_node(pRExC_state, NOTHING);
5850 *flagp |= flags&SIMPLE;
5857 - regpiece - something followed by possible [*+?]
5859 * Note that the branching code sequences used for ? and the general cases
5860 * of * and + are somewhat optimized: they use the same NOTHING node as
5861 * both the endmarker for their branch list and the body of the last branch.
5862 * It might seem that this node could be dispensed with entirely, but the
5863 * endmarker role is not redundant.
5866 S_regpiece(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
5869 register regnode *ret;
5871 register char *next;
5873 const char * const origparse = RExC_parse;
5875 I32 max = REG_INFTY;
5877 const char *maxpos = NULL;
5878 GET_RE_DEBUG_FLAGS_DECL;
5879 DEBUG_PARSE("piec");
5881 ret = regatom(pRExC_state, &flags,depth+1);
5883 if (flags & TRYAGAIN)
5890 if (op == '{' && regcurly(RExC_parse)) {
5892 parse_start = RExC_parse; /* MJD */
5893 next = RExC_parse + 1;
5894 while (isDIGIT(*next) || *next == ',') {
5903 if (*next == '}') { /* got one */
5907 min = atoi(RExC_parse);
5911 maxpos = RExC_parse;
5913 if (!max && *maxpos != '0')
5914 max = REG_INFTY; /* meaning "infinity" */
5915 else if (max >= REG_INFTY)
5916 vFAIL2("Quantifier in {,} bigger than %d", REG_INFTY - 1);
5918 nextchar(pRExC_state);
5921 if ((flags&SIMPLE)) {
5922 RExC_naughty += 2 + RExC_naughty / 2;
5923 reginsert(pRExC_state, CURLY, ret, depth+1);
5924 Set_Node_Offset(ret, parse_start+1); /* MJD */
5925 Set_Node_Cur_Length(ret);
5928 regnode * const w = reg_node(pRExC_state, WHILEM);
5931 REGTAIL(pRExC_state, ret, w);
5932 if (!SIZE_ONLY && RExC_extralen) {
5933 reginsert(pRExC_state, LONGJMP,ret, depth+1);
5934 reginsert(pRExC_state, NOTHING,ret, depth+1);
5935 NEXT_OFF(ret) = 3; /* Go over LONGJMP. */
5937 reginsert(pRExC_state, CURLYX,ret, depth+1);
5939 Set_Node_Offset(ret, parse_start+1);
5940 Set_Node_Length(ret,
5941 op == '{' ? (RExC_parse - parse_start) : 1);
5943 if (!SIZE_ONLY && RExC_extralen)
5944 NEXT_OFF(ret) = 3; /* Go over NOTHING to LONGJMP. */
5945 REGTAIL(pRExC_state, ret, reg_node(pRExC_state, NOTHING));
5947 RExC_whilem_seen++, RExC_extralen += 3;
5948 RExC_naughty += 4 + RExC_naughty; /* compound interest */
5956 if (max && max < min)
5957 vFAIL("Can't do {n,m} with n > m");
5959 ARG1_SET(ret, (U16)min);
5960 ARG2_SET(ret, (U16)max);
5972 #if 0 /* Now runtime fix should be reliable. */
5974 /* if this is reinstated, don't forget to put this back into perldiag:
5976 =item Regexp *+ operand could be empty at {#} in regex m/%s/
5978 (F) The part of the regexp subject to either the * or + quantifier
5979 could match an empty string. The {#} shows in the regular
5980 expression about where the problem was discovered.
5984 if (!(flags&HASWIDTH) && op != '?')
5985 vFAIL("Regexp *+ operand could be empty");
5988 parse_start = RExC_parse;
5989 nextchar(pRExC_state);
5991 *flagp = (op != '+') ? (WORST|SPSTART|HASWIDTH) : (WORST|HASWIDTH);
5993 if (op == '*' && (flags&SIMPLE)) {
5994 reginsert(pRExC_state, STAR, ret, depth+1);
5998 else if (op == '*') {
6002 else if (op == '+' && (flags&SIMPLE)) {
6003 reginsert(pRExC_state, PLUS, ret, depth+1);
6007 else if (op == '+') {
6011 else if (op == '?') {
6016 if (!SIZE_ONLY && !(flags&HASWIDTH) && max > REG_INFTY/3 && ckWARN(WARN_REGEXP)) {
6018 "%.*s matches null string many times",
6019 (int)(RExC_parse >= origparse ? RExC_parse - origparse : 0),
6023 if (RExC_parse < RExC_end && *RExC_parse == '?') {
6024 nextchar(pRExC_state);
6025 reginsert(pRExC_state, MINMOD, ret, depth+1);
6026 REGTAIL(pRExC_state, ret, ret + NODE_STEP_REGNODE);
6028 #ifndef REG_ALLOW_MINMOD_SUSPEND
6031 if (RExC_parse < RExC_end && *RExC_parse == '+') {
6033 nextchar(pRExC_state);
6034 ender = reg_node(pRExC_state, SUCCEED);
6035 REGTAIL(pRExC_state, ret, ender);
6036 reginsert(pRExC_state, SUSPEND, ret, depth+1);
6038 ender = reg_node(pRExC_state, TAIL);
6039 REGTAIL(pRExC_state, ret, ender);
6043 if (RExC_parse < RExC_end && ISMULT2(RExC_parse)) {
6045 vFAIL("Nested quantifiers");
6052 /* reg_namedseq(pRExC_state,UVp)
6054 This is expected to be called by a parser routine that has
6055 recognized'\N' and needs to handle the rest. RExC_parse is
6056 expected to point at the first char following the N at the time
6059 If valuep is non-null then it is assumed that we are parsing inside
6060 of a charclass definition and the first codepoint in the resolved
6061 string is returned via *valuep and the routine will return NULL.
6062 In this mode if a multichar string is returned from the charnames
6063 handler a warning will be issued, and only the first char in the
6064 sequence will be examined. If the string returned is zero length
6065 then the value of *valuep is undefined and NON-NULL will
6066 be returned to indicate failure. (This will NOT be a valid pointer
6069 If value is null then it is assumed that we are parsing normal text
6070 and inserts a new EXACT node into the program containing the resolved
6071 string and returns a pointer to the new node. If the string is
6072 zerolength a NOTHING node is emitted.
6074 On success RExC_parse is set to the char following the endbrace.
6075 Parsing failures will generate a fatal errorvia vFAIL(...)
6077 NOTE: We cache all results from the charnames handler locally in
6078 the RExC_charnames hash (created on first use) to prevent a charnames
6079 handler from playing silly-buggers and returning a short string and
6080 then a long string for a given pattern. Since the regexp program
6081 size is calculated during an initial parse this would result
6082 in a buffer overrun so we cache to prevent the charname result from
6083 changing during the course of the parse.
6087 S_reg_namedseq(pTHX_ RExC_state_t *pRExC_state, UV *valuep)
6089 char * name; /* start of the content of the name */
6090 char * endbrace; /* endbrace following the name */
6093 STRLEN len; /* this has various purposes throughout the code */
6094 bool cached = 0; /* if this is true then we shouldn't refcount dev sv_str */
6095 regnode *ret = NULL;
6097 if (*RExC_parse != '{') {
6098 vFAIL("Missing braces on \\N{}");
6100 name = RExC_parse+1;
6101 endbrace = strchr(RExC_parse, '}');
6104 vFAIL("Missing right brace on \\N{}");
6106 RExC_parse = endbrace + 1;
6109 /* RExC_parse points at the beginning brace,
6110 endbrace points at the last */
6111 if ( name[0]=='U' && name[1]=='+' ) {
6112 /* its a "unicode hex" notation {U+89AB} */
6113 I32 fl = PERL_SCAN_ALLOW_UNDERSCORES
6114 | PERL_SCAN_DISALLOW_PREFIX
6115 | (SIZE_ONLY ? PERL_SCAN_SILENT_ILLDIGIT : 0);
6117 len = (STRLEN)(endbrace - name - 2);
6118 cp = grok_hex(name + 2, &len, &fl, NULL);
6119 if ( len != (STRLEN)(endbrace - name - 2) ) {
6128 sv_str= Perl_newSVpvf_nocontext("%c",(int)cp);
6130 /* fetch the charnames handler for this scope */
6131 HV * const table = GvHV(PL_hintgv);
6133 hv_fetchs(table, "charnames", FALSE) :
6135 SV *cv= cvp ? *cvp : NULL;
6138 /* create an SV with the name as argument */
6139 sv_name = newSVpvn(name, endbrace - name);
6141 if (!table || !(PL_hints & HINT_LOCALIZE_HH)) {
6142 vFAIL2("Constant(\\N{%s}) unknown: "
6143 "(possibly a missing \"use charnames ...\")",
6146 if (!cvp || !SvOK(*cvp)) { /* when $^H{charnames} = undef; */
6147 vFAIL2("Constant(\\N{%s}): "
6148 "$^H{charnames} is not defined",SvPVX(sv_name));
6153 if (!RExC_charnames) {
6154 /* make sure our cache is allocated */
6155 RExC_charnames = newHV();
6156 sv_2mortal((SV*)RExC_charnames);
6158 /* see if we have looked this one up before */
6159 he_str = hv_fetch_ent( RExC_charnames, sv_name, 0, 0 );
6161 sv_str = HeVAL(he_str);
6174 count= call_sv(cv, G_SCALAR);
6176 if (count == 1) { /* XXXX is this right? dmq */
6178 SvREFCNT_inc_simple_void(sv_str);
6186 if ( !sv_str || !SvOK(sv_str) ) {
6187 vFAIL2("Constant(\\N{%s}): Call to &{$^H{charnames}} "
6188 "did not return a defined value",SvPVX(sv_name));
6190 if (hv_store_ent( RExC_charnames, sv_name, sv_str, 0))
6195 char *p = SvPV(sv_str, len);
6198 if ( SvUTF8(sv_str) ) {
6199 *valuep = utf8_to_uvchr((U8*)p, &numlen);
6203 We have to turn on utf8 for high bit chars otherwise
6204 we get failures with
6206 "ss" =~ /[\N{LATIN SMALL LETTER SHARP S}]/i
6207 "SS" =~ /[\N{LATIN SMALL LETTER SHARP S}]/i
6209 This is different from what \x{} would do with the same
6210 codepoint, where the condition is > 0xFF.
6217 /* warn if we havent used the whole string? */
6219 if (numlen<len && SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6221 "Ignoring excess chars from \\N{%s} in character class",
6225 } else if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
6227 "Ignoring zero length \\N{%s} in character class",
6232 SvREFCNT_dec(sv_name);
6234 SvREFCNT_dec(sv_str);
6235 return len ? NULL : (regnode *)&len;
6236 } else if(SvCUR(sv_str)) {
6242 char * parse_start = name-3; /* needed for the offsets */
6244 GET_RE_DEBUG_FLAGS_DECL; /* needed for the offsets */
6246 ret = reg_node(pRExC_state,
6247 (U8)(FOLD ? (LOC ? EXACTFL : EXACTF) : EXACT));
6250 if ( RExC_utf8 && !SvUTF8(sv_str) ) {
6251 sv_utf8_upgrade(sv_str);
6252 } else if ( !RExC_utf8 && SvUTF8(sv_str) ) {
6256 p = SvPV(sv_str, len);
6258 /* len is the length written, charlen is the size the char read */
6259 for ( len = 0; p < pend; p += charlen ) {
6261 UV uvc = utf8_to_uvchr((U8*)p, &charlen);
6263 STRLEN foldlen,numlen;
6264 U8 tmpbuf[UTF8_MAXBYTES_CASE+1], *foldbuf;
6265 uvc = toFOLD_uni(uvc, tmpbuf, &foldlen);
6266 /* Emit all the Unicode characters. */
6268 for (foldbuf = tmpbuf;
6272 uvc = utf8_to_uvchr(foldbuf, &numlen);
6274 const STRLEN unilen = reguni(pRExC_state, uvc, s);
6277 /* In EBCDIC the numlen
6278 * and unilen can differ. */
6280 if (numlen >= foldlen)
6284 break; /* "Can't happen." */
6287 const STRLEN unilen = reguni(pRExC_state, uvc, s);
6299 RExC_size += STR_SZ(len);
6302 RExC_emit += STR_SZ(len);
6304 Set_Node_Cur_Length(ret); /* MJD */
6306 nextchar(pRExC_state);
6308 ret = reg_node(pRExC_state,NOTHING);
6311 SvREFCNT_dec(sv_str);
6314 SvREFCNT_dec(sv_name);
6324 * It returns the code point in utf8 for the value in *encp.
6325 * value: a code value in the source encoding
6326 * encp: a pointer to an Encode object
6328 * If the result from Encode is not a single character,
6329 * it returns U+FFFD (Replacement character) and sets *encp to NULL.
6332 S_reg_recode(pTHX_ const char value, SV **encp)
6335 SV * const sv = sv_2mortal(newSVpvn(&value, numlen));
6336 const char * const s = encp && *encp ? sv_recode_to_utf8(sv, *encp)
6338 const STRLEN newlen = SvCUR(sv);
6339 UV uv = UNICODE_REPLACEMENT;
6343 ? utf8n_to_uvchr((U8*)s, newlen, &numlen, UTF8_ALLOW_DEFAULT)
6346 if (!newlen || numlen != newlen) {
6347 uv = UNICODE_REPLACEMENT;
6356 - regatom - the lowest level
6358 Try to identify anything special at the start of the pattern. If there
6359 is, then handle it as required. This may involve generating a single regop,
6360 such as for an assertion; or it may involve recursing, such as to
6361 handle a () structure.
6363 If the string doesn't start with something special then we gobble up
6364 as much literal text as we can.
6366 Once we have been able to handle whatever type of thing started the
6367 sequence, we return.
6369 Note: we have to be careful with escapes, as they can be both literal
6370 and special, and in the case of \10 and friends can either, depending
6371 on context. Specifically there are two seperate switches for handling
6372 escape sequences, with the one for handling literal escapes requiring
6373 a dummy entry for all of the special escapes that are actually handled
6378 S_regatom(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
6381 register regnode *ret = NULL;
6383 char *parse_start = RExC_parse;
6384 GET_RE_DEBUG_FLAGS_DECL;
6385 DEBUG_PARSE("atom");
6386 *flagp = WORST; /* Tentatively. */
6390 switch (*RExC_parse) {
6392 RExC_seen_zerolen++;
6393 nextchar(pRExC_state);
6394 if (RExC_flags & RXf_PMf_MULTILINE)
6395 ret = reg_node(pRExC_state, MBOL);
6396 else if (RExC_flags & RXf_PMf_SINGLELINE)
6397 ret = reg_node(pRExC_state, SBOL);
6399 ret = reg_node(pRExC_state, BOL);
6400 Set_Node_Length(ret, 1); /* MJD */
6403 nextchar(pRExC_state);
6405 RExC_seen_zerolen++;
6406 if (RExC_flags & RXf_PMf_MULTILINE)
6407 ret = reg_node(pRExC_state, MEOL);
6408 else if (RExC_flags & RXf_PMf_SINGLELINE)
6409 ret = reg_node(pRExC_state, SEOL);
6411 ret = reg_node(pRExC_state, EOL);
6412 Set_Node_Length(ret, 1); /* MJD */
6415 nextchar(pRExC_state);
6416 if (RExC_flags & RXf_PMf_SINGLELINE)
6417 ret = reg_node(pRExC_state, SANY);
6419 ret = reg_node(pRExC_state, REG_ANY);
6420 *flagp |= HASWIDTH|SIMPLE;
6422 Set_Node_Length(ret, 1); /* MJD */
6426 char * const oregcomp_parse = ++RExC_parse;
6427 ret = regclass(pRExC_state,depth+1);
6428 if (*RExC_parse != ']') {
6429 RExC_parse = oregcomp_parse;
6430 vFAIL("Unmatched [");
6432 nextchar(pRExC_state);
6433 *flagp |= HASWIDTH|SIMPLE;
6434 Set_Node_Length(ret, RExC_parse - oregcomp_parse + 1); /* MJD */
6438 nextchar(pRExC_state);
6439 ret = reg(pRExC_state, 1, &flags,depth+1);
6441 if (flags & TRYAGAIN) {
6442 if (RExC_parse == RExC_end) {
6443 /* Make parent create an empty node if needed. */
6451 *flagp |= flags&(HASWIDTH|SPSTART|SIMPLE);
6455 if (flags & TRYAGAIN) {
6459 vFAIL("Internal urp");
6460 /* Supposed to be caught earlier. */
6463 if (!regcurly(RExC_parse)) {
6472 vFAIL("Quantifier follows nothing");
6477 This switch handles escape sequences that resolve to some kind
6478 of special regop and not to literal text. Escape sequnces that
6479 resolve to literal text are handled below in the switch marked
6482 Every entry in this switch *must* have a corresponding entry
6483 in the literal escape switch. However, the opposite is not
6484 required, as the default for this switch is to jump to the
6485 literal text handling code.
6487 switch (*++RExC_parse) {
6488 /* Special Escapes */
6490 RExC_seen_zerolen++;
6491 ret = reg_node(pRExC_state, SBOL);
6493 goto finish_meta_pat;
6495 ret = reg_node(pRExC_state, GPOS);
6496 RExC_seen |= REG_SEEN_GPOS;
6498 goto finish_meta_pat;
6500 RExC_seen_zerolen++;
6501 ret = reg_node(pRExC_state, KEEPS);
6503 goto finish_meta_pat;
6505 ret = reg_node(pRExC_state, SEOL);
6507 RExC_seen_zerolen++; /* Do not optimize RE away */
6508 goto finish_meta_pat;
6510 ret = reg_node(pRExC_state, EOS);
6512 RExC_seen_zerolen++; /* Do not optimize RE away */
6513 goto finish_meta_pat;
6515 ret = reg_node(pRExC_state, CANY);
6516 RExC_seen |= REG_SEEN_CANY;
6517 *flagp |= HASWIDTH|SIMPLE;
6518 goto finish_meta_pat;
6520 ret = reg_node(pRExC_state, CLUMP);
6522 goto finish_meta_pat;
6524 ret = reg_node(pRExC_state, (U8)(LOC ? ALNUML : ALNUM));
6525 *flagp |= HASWIDTH|SIMPLE;
6526 goto finish_meta_pat;
6528 ret = reg_node(pRExC_state, (U8)(LOC ? NALNUML : NALNUM));
6529 *flagp |= HASWIDTH|SIMPLE;
6530 goto finish_meta_pat;
6532 RExC_seen_zerolen++;
6533 RExC_seen |= REG_SEEN_LOOKBEHIND;
6534 ret = reg_node(pRExC_state, (U8)(LOC ? BOUNDL : BOUND));
6536 goto finish_meta_pat;
6538 RExC_seen_zerolen++;
6539 RExC_seen |= REG_SEEN_LOOKBEHIND;
6540 ret = reg_node(pRExC_state, (U8)(LOC ? NBOUNDL : NBOUND));
6542 goto finish_meta_pat;
6544 ret = reg_node(pRExC_state, (U8)(LOC ? SPACEL : SPACE));
6545 *flagp |= HASWIDTH|SIMPLE;
6546 goto finish_meta_pat;
6548 ret = reg_node(pRExC_state, (U8)(LOC ? NSPACEL : NSPACE));
6549 *flagp |= HASWIDTH|SIMPLE;
6550 goto finish_meta_pat;
6552 ret = reg_node(pRExC_state, DIGIT);
6553 *flagp |= HASWIDTH|SIMPLE;
6554 goto finish_meta_pat;
6556 ret = reg_node(pRExC_state, NDIGIT);
6557 *flagp |= HASWIDTH|SIMPLE;
6558 goto finish_meta_pat;
6560 ret = reganode(pRExC_state, PRUNE, 0);
6563 goto finish_meta_pat;
6565 ret = reganode(pRExC_state, SKIP, 0);
6569 nextchar(pRExC_state);
6570 Set_Node_Length(ret, 2); /* MJD */
6575 char* const oldregxend = RExC_end;
6577 char* parse_start = RExC_parse - 2;
6580 if (RExC_parse[1] == '{') {
6581 /* a lovely hack--pretend we saw [\pX] instead */
6582 RExC_end = strchr(RExC_parse, '}');
6584 const U8 c = (U8)*RExC_parse;
6586 RExC_end = oldregxend;
6587 vFAIL2("Missing right brace on \\%c{}", c);
6592 RExC_end = RExC_parse + 2;
6593 if (RExC_end > oldregxend)
6594 RExC_end = oldregxend;
6598 ret = regclass(pRExC_state,depth+1);
6600 RExC_end = oldregxend;
6603 Set_Node_Offset(ret, parse_start + 2);
6604 Set_Node_Cur_Length(ret);
6605 nextchar(pRExC_state);
6606 *flagp |= HASWIDTH|SIMPLE;
6610 /* Handle \N{NAME} here and not below because it can be
6611 multicharacter. join_exact() will join them up later on.
6612 Also this makes sure that things like /\N{BLAH}+/ and
6613 \N{BLAH} being multi char Just Happen. dmq*/
6615 ret= reg_namedseq(pRExC_state, NULL);
6617 case 'k': /* Handle \k<NAME> and \k'NAME' */
6620 char ch= RExC_parse[1];
6621 if (ch != '<' && ch != '\'' && ch != '{') {
6623 vFAIL2("Sequence %.2s... not terminated",parse_start);
6625 /* this pretty much dupes the code for (?P=...) in reg(), if
6626 you change this make sure you change that */
6627 char* name_start = (RExC_parse += 2);
6629 SV *sv_dat = reg_scan_name(pRExC_state,
6630 SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
6631 ch= (ch == '<') ? '>' : (ch == '{') ? '}' : '\'';
6632 if (RExC_parse == name_start || *RExC_parse != ch)
6633 vFAIL2("Sequence %.3s... not terminated",parse_start);
6636 num = add_data( pRExC_state, 1, "S" );
6637 RExC_rxi->data->data[num]=(void*)sv_dat;
6638 SvREFCNT_inc(sv_dat);
6642 ret = reganode(pRExC_state,
6643 (U8)(FOLD ? (LOC ? NREFFL : NREFF) : NREF),
6647 /* override incorrect value set in reganode MJD */
6648 Set_Node_Offset(ret, parse_start+1);
6649 Set_Node_Cur_Length(ret); /* MJD */
6650 nextchar(pRExC_state);
6656 case '1': case '2': case '3': case '4':
6657 case '5': case '6': case '7': case '8': case '9':
6660 bool isg = *RExC_parse == 'g';
6665 if (*RExC_parse == '{') {
6669 if (*RExC_parse == '-') {
6673 if (hasbrace && !isDIGIT(*RExC_parse)) {
6674 if (isrel) RExC_parse--;
6676 goto parse_named_seq;
6678 num = atoi(RExC_parse);
6680 num = RExC_npar - num;
6682 vFAIL("Reference to nonexistent or unclosed group");
6684 if (!isg && num > 9 && num >= RExC_npar)
6687 char * const parse_start = RExC_parse - 1; /* MJD */
6688 while (isDIGIT(*RExC_parse))
6690 if (parse_start == RExC_parse - 1)
6691 vFAIL("Unterminated \\g... pattern");
6693 if (*RExC_parse != '}')
6694 vFAIL("Unterminated \\g{...} pattern");
6698 if (num > (I32)RExC_rx->nparens)
6699 vFAIL("Reference to nonexistent group");
6702 ret = reganode(pRExC_state,
6703 (U8)(FOLD ? (LOC ? REFFL : REFF) : REF),
6707 /* override incorrect value set in reganode MJD */
6708 Set_Node_Offset(ret, parse_start+1);
6709 Set_Node_Cur_Length(ret); /* MJD */
6711 nextchar(pRExC_state);
6716 if (RExC_parse >= RExC_end)
6717 FAIL("Trailing \\");
6720 /* Do not generate "unrecognized" warnings here, we fall
6721 back into the quick-grab loop below */
6728 if (RExC_flags & RXf_PMf_EXTENDED) {
6729 if ( reg_skipcomment( pRExC_state ) )
6735 register STRLEN len;
6740 U8 tmpbuf[UTF8_MAXBYTES_CASE+1], *foldbuf;
6742 parse_start = RExC_parse - 1;
6748 ret = reg_node(pRExC_state,
6749 (U8)(FOLD ? (LOC ? EXACTFL : EXACTF) : EXACT));
6751 for (len = 0, p = RExC_parse - 1;
6752 len < 127 && p < RExC_end;
6755 char * const oldp = p;
6757 if (RExC_flags & RXf_PMf_EXTENDED)
6758 p = regwhite( pRExC_state, p );
6769 /* Literal Escapes Switch
6771 This switch is meant to handle escape sequences that
6772 resolve to a literal character.
6774 Every escape sequence that represents something
6775 else, like an assertion or a char class, is handled
6776 in the switch marked 'Special Escapes' above in this
6777 routine, but also has an entry here as anything that
6778 isn't explicitly mentioned here will be treated as
6779 an unescaped equivalent literal.
6783 /* These are all the special escapes. */
6784 case 'A': /* Start assertion */
6785 case 'b': case 'B': /* Word-boundary assertion*/
6786 case 'C': /* Single char !DANGEROUS! */
6787 case 'd': case 'D': /* digit class */
6788 case 'g': case 'G': /* generic-backref, pos assertion */
6789 case 'k': case 'K': /* named backref, keep marker */
6790 case 'N': /* named char sequence */
6791 case 'p': case 'P': /* unicode property */
6792 case 's': case 'S': /* space class */
6793 case 'v': case 'V': /* (*PRUNE) and (*SKIP) */
6794 case 'w': case 'W': /* word class */
6795 case 'X': /* eXtended Unicode "combining character sequence" */
6796 case 'z': case 'Z': /* End of line/string assertion */
6800 /* Anything after here is an escape that resolves to a
6801 literal. (Except digits, which may or may not)
6820 ender = ASCII_TO_NATIVE('\033');
6824 ender = ASCII_TO_NATIVE('\007');
6829 char* const e = strchr(p, '}');
6833 vFAIL("Missing right brace on \\x{}");
6836 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
6837 | PERL_SCAN_DISALLOW_PREFIX;
6838 STRLEN numlen = e - p - 1;
6839 ender = grok_hex(p + 1, &numlen, &flags, NULL);
6846 I32 flags = PERL_SCAN_DISALLOW_PREFIX;
6848 ender = grok_hex(p, &numlen, &flags, NULL);
6851 if (PL_encoding && ender < 0x100)
6852 goto recode_encoding;
6856 ender = UCHARAT(p++);
6857 ender = toCTRL(ender);
6859 case '0': case '1': case '2': case '3':case '4':
6860 case '5': case '6': case '7': case '8':case '9':
6862 (isDIGIT(p[1]) && atoi(p) >= RExC_npar) ) {
6865 ender = grok_oct(p, &numlen, &flags, NULL);
6872 if (PL_encoding && ender < 0x100)
6873 goto recode_encoding;
6877 SV* enc = PL_encoding;
6878 ender = reg_recode((const char)(U8)ender, &enc);
6879 if (!enc && SIZE_ONLY && ckWARN(WARN_REGEXP))
6880 vWARN(p, "Invalid escape in the specified encoding");
6886 FAIL("Trailing \\");
6889 if (!SIZE_ONLY&& isALPHA(*p) && ckWARN(WARN_REGEXP))
6890 vWARN2(p + 1, "Unrecognized escape \\%c passed through", UCHARAT(p));
6891 goto normal_default;
6896 if (UTF8_IS_START(*p) && UTF) {
6898 ender = utf8n_to_uvchr((U8*)p, RExC_end - p,
6899 &numlen, UTF8_ALLOW_DEFAULT);
6906 if ( RExC_flags & RXf_PMf_EXTENDED)
6907 p = regwhite( pRExC_state, p );
6909 /* Prime the casefolded buffer. */
6910 ender = toFOLD_uni(ender, tmpbuf, &foldlen);
6912 if (p < RExC_end && ISMULT2(p)) { /* Back off on ?+*. */
6917 /* Emit all the Unicode characters. */
6919 for (foldbuf = tmpbuf;
6921 foldlen -= numlen) {
6922 ender = utf8_to_uvchr(foldbuf, &numlen);
6924 const STRLEN unilen = reguni(pRExC_state, ender, s);
6927 /* In EBCDIC the numlen
6928 * and unilen can differ. */
6930 if (numlen >= foldlen)
6934 break; /* "Can't happen." */
6938 const STRLEN unilen = reguni(pRExC_state, ender, s);
6947 REGC((char)ender, s++);
6953 /* Emit all the Unicode characters. */
6955 for (foldbuf = tmpbuf;
6957 foldlen -= numlen) {
6958 ender = utf8_to_uvchr(foldbuf, &numlen);
6960 const STRLEN unilen = reguni(pRExC_state, ender, s);
6963 /* In EBCDIC the numlen
6964 * and unilen can differ. */
6966 if (numlen >= foldlen)
6974 const STRLEN unilen = reguni(pRExC_state, ender, s);
6983 REGC((char)ender, s++);
6987 Set_Node_Cur_Length(ret); /* MJD */
6988 nextchar(pRExC_state);
6990 /* len is STRLEN which is unsigned, need to copy to signed */
6993 vFAIL("Internal disaster");
6997 if (len == 1 && UNI_IS_INVARIANT(ender))
7001 RExC_size += STR_SZ(len);
7004 RExC_emit += STR_SZ(len);
7014 S_regwhite( RExC_state_t *pRExC_state, char *p )
7016 const char *e = RExC_end;
7020 else if (*p == '#') {
7029 RExC_seen |= REG_SEEN_RUN_ON_COMMENT;
7037 /* Parse POSIX character classes: [[:foo:]], [[=foo=]], [[.foo.]].
7038 Character classes ([:foo:]) can also be negated ([:^foo:]).
7039 Returns a named class id (ANYOF_XXX) if successful, -1 otherwise.
7040 Equivalence classes ([=foo=]) and composites ([.foo.]) are parsed,
7041 but trigger failures because they are currently unimplemented. */
7043 #define POSIXCC_DONE(c) ((c) == ':')
7044 #define POSIXCC_NOTYET(c) ((c) == '=' || (c) == '.')
7045 #define POSIXCC(c) (POSIXCC_DONE(c) || POSIXCC_NOTYET(c))
7048 S_regpposixcc(pTHX_ RExC_state_t *pRExC_state, I32 value)
7051 I32 namedclass = OOB_NAMEDCLASS;
7053 if (value == '[' && RExC_parse + 1 < RExC_end &&
7054 /* I smell either [: or [= or [. -- POSIX has been here, right? */
7055 POSIXCC(UCHARAT(RExC_parse))) {
7056 const char c = UCHARAT(RExC_parse);
7057 char* const s = RExC_parse++;
7059 while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != c)
7061 if (RExC_parse == RExC_end)
7062 /* Grandfather lone [:, [=, [. */
7065 const char* const t = RExC_parse++; /* skip over the c */
7068 if (UCHARAT(RExC_parse) == ']') {
7069 const char *posixcc = s + 1;
7070 RExC_parse++; /* skip over the ending ] */
7073 const I32 complement = *posixcc == '^' ? *posixcc++ : 0;
7074 const I32 skip = t - posixcc;
7076 /* Initially switch on the length of the name. */
7079 if (memEQ(posixcc, "word", 4)) /* this is not POSIX, this is the Perl \w */
7080 namedclass = complement ? ANYOF_NALNUM : ANYOF_ALNUM;
7083 /* Names all of length 5. */
7084 /* alnum alpha ascii blank cntrl digit graph lower
7085 print punct space upper */
7086 /* Offset 4 gives the best switch position. */
7087 switch (posixcc[4]) {
7089 if (memEQ(posixcc, "alph", 4)) /* alpha */
7090 namedclass = complement ? ANYOF_NALPHA : ANYOF_ALPHA;
7093 if (memEQ(posixcc, "spac", 4)) /* space */
7094 namedclass = complement ? ANYOF_NPSXSPC : ANYOF_PSXSPC;
7097 if (memEQ(posixcc, "grap", 4)) /* graph */
7098 namedclass = complement ? ANYOF_NGRAPH : ANYOF_GRAPH;
7101 if (memEQ(posixcc, "asci", 4)) /* ascii */
7102 namedclass = complement ? ANYOF_NASCII : ANYOF_ASCII;
7105 if (memEQ(posixcc, "blan", 4)) /* blank */
7106 namedclass = complement ? ANYOF_NBLANK : ANYOF_BLANK;
7109 if (memEQ(posixcc, "cntr", 4)) /* cntrl */
7110 namedclass = complement ? ANYOF_NCNTRL : ANYOF_CNTRL;
7113 if (memEQ(posixcc, "alnu", 4)) /* alnum */
7114 namedclass = complement ? ANYOF_NALNUMC : ANYOF_ALNUMC;
7117 if (memEQ(posixcc, "lowe", 4)) /* lower */
7118 namedclass = complement ? ANYOF_NLOWER : ANYOF_LOWER;
7119 else if (memEQ(posixcc, "uppe", 4)) /* upper */
7120 namedclass = complement ? ANYOF_NUPPER : ANYOF_UPPER;
7123 if (memEQ(posixcc, "digi", 4)) /* digit */
7124 namedclass = complement ? ANYOF_NDIGIT : ANYOF_DIGIT;
7125 else if (memEQ(posixcc, "prin", 4)) /* print */
7126 namedclass = complement ? ANYOF_NPRINT : ANYOF_PRINT;
7127 else if (memEQ(posixcc, "punc", 4)) /* punct */
7128 namedclass = complement ? ANYOF_NPUNCT : ANYOF_PUNCT;
7133 if (memEQ(posixcc, "xdigit", 6))
7134 namedclass = complement ? ANYOF_NXDIGIT : ANYOF_XDIGIT;
7138 if (namedclass == OOB_NAMEDCLASS)
7139 Simple_vFAIL3("POSIX class [:%.*s:] unknown",
7141 assert (posixcc[skip] == ':');
7142 assert (posixcc[skip+1] == ']');
7143 } else if (!SIZE_ONLY) {
7144 /* [[=foo=]] and [[.foo.]] are still future. */
7146 /* adjust RExC_parse so the warning shows after
7148 while (UCHARAT(RExC_parse) && UCHARAT(RExC_parse) != ']')
7150 Simple_vFAIL3("POSIX syntax [%c %c] is reserved for future extensions", c, c);
7153 /* Maternal grandfather:
7154 * "[:" ending in ":" but not in ":]" */
7164 S_checkposixcc(pTHX_ RExC_state_t *pRExC_state)
7167 if (POSIXCC(UCHARAT(RExC_parse))) {
7168 const char *s = RExC_parse;
7169 const char c = *s++;
7173 if (*s && c == *s && s[1] == ']') {
7174 if (ckWARN(WARN_REGEXP))
7176 "POSIX syntax [%c %c] belongs inside character classes",
7179 /* [[=foo=]] and [[.foo.]] are still future. */
7180 if (POSIXCC_NOTYET(c)) {
7181 /* adjust RExC_parse so the error shows after
7183 while (UCHARAT(RExC_parse) && UCHARAT(RExC_parse++) != ']')
7185 Simple_vFAIL3("POSIX syntax [%c %c] is reserved for future extensions", c, c);
7192 #define _C_C_T_(NAME,TEST,WORD) \
7195 ANYOF_CLASS_SET(ret, ANYOF_##NAME); \
7197 for (value = 0; value < 256; value++) \
7199 ANYOF_BITMAP_SET(ret, value); \
7204 case ANYOF_N##NAME: \
7206 ANYOF_CLASS_SET(ret, ANYOF_N##NAME); \
7208 for (value = 0; value < 256; value++) \
7210 ANYOF_BITMAP_SET(ret, value); \
7218 parse a class specification and produce either an ANYOF node that
7219 matches the pattern or if the pattern matches a single char only and
7220 that char is < 256 and we are case insensitive then we produce an
7225 S_regclass(pTHX_ RExC_state_t *pRExC_state, U32 depth)
7228 register UV value = 0;
7229 register UV nextvalue;
7230 register IV prevvalue = OOB_UNICODE;
7231 register IV range = 0;
7232 register regnode *ret;
7235 char *rangebegin = NULL;
7236 bool need_class = 0;
7239 bool optimize_invert = TRUE;
7240 AV* unicode_alternate = NULL;
7242 UV literal_endpoint = 0;
7244 UV stored = 0; /* number of chars stored in the class */
7246 regnode * const orig_emit = RExC_emit; /* Save the original RExC_emit in
7247 case we need to change the emitted regop to an EXACT. */
7248 const char * orig_parse = RExC_parse;
7249 GET_RE_DEBUG_FLAGS_DECL;
7251 PERL_UNUSED_ARG(depth);
7254 DEBUG_PARSE("clas");
7256 /* Assume we are going to generate an ANYOF node. */
7257 ret = reganode(pRExC_state, ANYOF, 0);
7260 ANYOF_FLAGS(ret) = 0;
7262 if (UCHARAT(RExC_parse) == '^') { /* Complement of range. */
7266 ANYOF_FLAGS(ret) |= ANYOF_INVERT;
7270 RExC_size += ANYOF_SKIP;
7271 listsv = &PL_sv_undef; /* For code scanners: listsv always non-NULL. */
7274 RExC_emit += ANYOF_SKIP;
7276 ANYOF_FLAGS(ret) |= ANYOF_FOLD;
7278 ANYOF_FLAGS(ret) |= ANYOF_LOCALE;
7279 ANYOF_BITMAP_ZERO(ret);
7280 listsv = newSVpvs("# comment\n");
7283 nextvalue = RExC_parse < RExC_end ? UCHARAT(RExC_parse) : 0;
7285 if (!SIZE_ONLY && POSIXCC(nextvalue))
7286 checkposixcc(pRExC_state);
7288 /* allow 1st char to be ] (allowing it to be - is dealt with later) */
7289 if (UCHARAT(RExC_parse) == ']')
7293 while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != ']') {
7297 namedclass = OOB_NAMEDCLASS; /* initialize as illegal */
7300 rangebegin = RExC_parse;
7302 value = utf8n_to_uvchr((U8*)RExC_parse,
7303 RExC_end - RExC_parse,
7304 &numlen, UTF8_ALLOW_DEFAULT);
7305 RExC_parse += numlen;
7308 value = UCHARAT(RExC_parse++);
7310 nextvalue = RExC_parse < RExC_end ? UCHARAT(RExC_parse) : 0;
7311 if (value == '[' && POSIXCC(nextvalue))
7312 namedclass = regpposixcc(pRExC_state, value);
7313 else if (value == '\\') {
7315 value = utf8n_to_uvchr((U8*)RExC_parse,
7316 RExC_end - RExC_parse,
7317 &numlen, UTF8_ALLOW_DEFAULT);
7318 RExC_parse += numlen;
7321 value = UCHARAT(RExC_parse++);
7322 /* Some compilers cannot handle switching on 64-bit integer
7323 * values, therefore value cannot be an UV. Yes, this will
7324 * be a problem later if we want switch on Unicode.
7325 * A similar issue a little bit later when switching on
7326 * namedclass. --jhi */
7327 switch ((I32)value) {
7328 case 'w': namedclass = ANYOF_ALNUM; break;
7329 case 'W': namedclass = ANYOF_NALNUM; break;
7330 case 's': namedclass = ANYOF_SPACE; break;
7331 case 'S': namedclass = ANYOF_NSPACE; break;
7332 case 'd': namedclass = ANYOF_DIGIT; break;
7333 case 'D': namedclass = ANYOF_NDIGIT; break;
7334 case 'N': /* Handle \N{NAME} in class */
7336 /* We only pay attention to the first char of
7337 multichar strings being returned. I kinda wonder
7338 if this makes sense as it does change the behaviour
7339 from earlier versions, OTOH that behaviour was broken
7341 UV v; /* value is register so we cant & it /grrr */
7342 if (reg_namedseq(pRExC_state, &v)) {
7352 if (RExC_parse >= RExC_end)
7353 vFAIL2("Empty \\%c{}", (U8)value);
7354 if (*RExC_parse == '{') {
7355 const U8 c = (U8)value;
7356 e = strchr(RExC_parse++, '}');
7358 vFAIL2("Missing right brace on \\%c{}", c);
7359 while (isSPACE(UCHARAT(RExC_parse)))
7361 if (e == RExC_parse)
7362 vFAIL2("Empty \\%c{}", c);
7364 while (isSPACE(UCHARAT(RExC_parse + n - 1)))
7372 if (UCHARAT(RExC_parse) == '^') {
7375 value = value == 'p' ? 'P' : 'p'; /* toggle */
7376 while (isSPACE(UCHARAT(RExC_parse))) {
7381 Perl_sv_catpvf(aTHX_ listsv, "%cutf8::%.*s\n",
7382 (value=='p' ? '+' : '!'), (int)n, RExC_parse);
7385 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
7386 namedclass = ANYOF_MAX; /* no official name, but it's named */
7389 case 'n': value = '\n'; break;
7390 case 'r': value = '\r'; break;
7391 case 't': value = '\t'; break;
7392 case 'f': value = '\f'; break;
7393 case 'b': value = '\b'; break;
7394 case 'e': value = ASCII_TO_NATIVE('\033');break;
7395 case 'a': value = ASCII_TO_NATIVE('\007');break;
7397 if (*RExC_parse == '{') {
7398 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
7399 | PERL_SCAN_DISALLOW_PREFIX;
7400 char * const e = strchr(RExC_parse++, '}');
7402 vFAIL("Missing right brace on \\x{}");
7404 numlen = e - RExC_parse;
7405 value = grok_hex(RExC_parse, &numlen, &flags, NULL);
7409 I32 flags = PERL_SCAN_DISALLOW_PREFIX;
7411 value = grok_hex(RExC_parse, &numlen, &flags, NULL);
7412 RExC_parse += numlen;
7414 if (PL_encoding && value < 0x100)
7415 goto recode_encoding;
7418 value = UCHARAT(RExC_parse++);
7419 value = toCTRL(value);
7421 case '0': case '1': case '2': case '3': case '4':
7422 case '5': case '6': case '7': case '8': case '9':
7426 value = grok_oct(--RExC_parse, &numlen, &flags, NULL);
7427 RExC_parse += numlen;
7428 if (PL_encoding && value < 0x100)
7429 goto recode_encoding;
7434 SV* enc = PL_encoding;
7435 value = reg_recode((const char)(U8)value, &enc);
7436 if (!enc && SIZE_ONLY && ckWARN(WARN_REGEXP))
7438 "Invalid escape in the specified encoding");
7442 if (!SIZE_ONLY && isALPHA(value) && ckWARN(WARN_REGEXP))
7444 "Unrecognized escape \\%c in character class passed through",
7448 } /* end of \blah */
7454 if (namedclass > OOB_NAMEDCLASS) { /* this is a named class \blah */
7456 if (!SIZE_ONLY && !need_class)
7457 ANYOF_CLASS_ZERO(ret);
7461 /* a bad range like a-\d, a-[:digit:] ? */
7464 if (ckWARN(WARN_REGEXP)) {
7466 RExC_parse >= rangebegin ?
7467 RExC_parse - rangebegin : 0;
7469 "False [] range \"%*.*s\"",
7472 if (prevvalue < 256) {
7473 ANYOF_BITMAP_SET(ret, prevvalue);
7474 ANYOF_BITMAP_SET(ret, '-');
7477 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
7478 Perl_sv_catpvf(aTHX_ listsv,
7479 "%04"UVxf"\n%04"UVxf"\n", (UV)prevvalue, (UV) '-');
7483 range = 0; /* this was not a true range */
7489 const char *what = NULL;
7492 if (namedclass > OOB_NAMEDCLASS)
7493 optimize_invert = FALSE;
7494 /* Possible truncation here but in some 64-bit environments
7495 * the compiler gets heartburn about switch on 64-bit values.
7496 * A similar issue a little earlier when switching on value.
7498 switch ((I32)namedclass) {
7499 case _C_C_T_(ALNUM, isALNUM(value), "Word");
7500 case _C_C_T_(ALNUMC, isALNUMC(value), "Alnum");
7501 case _C_C_T_(ALPHA, isALPHA(value), "Alpha");
7502 case _C_C_T_(BLANK, isBLANK(value), "Blank");
7503 case _C_C_T_(CNTRL, isCNTRL(value), "Cntrl");
7504 case _C_C_T_(GRAPH, isGRAPH(value), "Graph");
7505 case _C_C_T_(LOWER, isLOWER(value), "Lower");
7506 case _C_C_T_(PRINT, isPRINT(value), "Print");
7507 case _C_C_T_(PSXSPC, isPSXSPC(value), "Space");
7508 case _C_C_T_(PUNCT, isPUNCT(value), "Punct");
7509 case _C_C_T_(SPACE, isSPACE(value), "SpacePerl");
7510 case _C_C_T_(UPPER, isUPPER(value), "Upper");
7511 case _C_C_T_(XDIGIT, isXDIGIT(value), "XDigit");
7514 ANYOF_CLASS_SET(ret, ANYOF_ASCII);
7517 for (value = 0; value < 128; value++)
7518 ANYOF_BITMAP_SET(ret, value);
7520 for (value = 0; value < 256; value++) {
7522 ANYOF_BITMAP_SET(ret, value);
7531 ANYOF_CLASS_SET(ret, ANYOF_NASCII);
7534 for (value = 128; value < 256; value++)
7535 ANYOF_BITMAP_SET(ret, value);
7537 for (value = 0; value < 256; value++) {
7538 if (!isASCII(value))
7539 ANYOF_BITMAP_SET(ret, value);
7548 ANYOF_CLASS_SET(ret, ANYOF_DIGIT);
7550 /* consecutive digits assumed */
7551 for (value = '0'; value <= '9'; value++)
7552 ANYOF_BITMAP_SET(ret, value);
7559 ANYOF_CLASS_SET(ret, ANYOF_NDIGIT);
7561 /* consecutive digits assumed */
7562 for (value = 0; value < '0'; value++)
7563 ANYOF_BITMAP_SET(ret, value);
7564 for (value = '9' + 1; value < 256; value++)
7565 ANYOF_BITMAP_SET(ret, value);
7571 /* this is to handle \p and \P */
7574 vFAIL("Invalid [::] class");
7578 /* Strings such as "+utf8::isWord\n" */
7579 Perl_sv_catpvf(aTHX_ listsv, "%cutf8::Is%s\n", yesno, what);
7582 ANYOF_FLAGS(ret) |= ANYOF_CLASS;
7585 } /* end of namedclass \blah */
7588 if (prevvalue > (IV)value) /* b-a */ {
7589 const int w = RExC_parse - rangebegin;
7590 Simple_vFAIL4("Invalid [] range \"%*.*s\"", w, w, rangebegin);
7591 range = 0; /* not a valid range */
7595 prevvalue = value; /* save the beginning of the range */
7596 if (*RExC_parse == '-' && RExC_parse+1 < RExC_end &&
7597 RExC_parse[1] != ']') {
7600 /* a bad range like \w-, [:word:]- ? */
7601 if (namedclass > OOB_NAMEDCLASS) {
7602 if (ckWARN(WARN_REGEXP)) {
7604 RExC_parse >= rangebegin ?
7605 RExC_parse - rangebegin : 0;
7607 "False [] range \"%*.*s\"",
7611 ANYOF_BITMAP_SET(ret, '-');
7613 range = 1; /* yeah, it's a range! */
7614 continue; /* but do it the next time */
7618 /* now is the next time */
7619 /*stored += (value - prevvalue + 1);*/
7621 if (prevvalue < 256) {
7622 const IV ceilvalue = value < 256 ? value : 255;
7625 /* In EBCDIC [\x89-\x91] should include
7626 * the \x8e but [i-j] should not. */
7627 if (literal_endpoint == 2 &&
7628 ((isLOWER(prevvalue) && isLOWER(ceilvalue)) ||
7629 (isUPPER(prevvalue) && isUPPER(ceilvalue))))
7631 if (isLOWER(prevvalue)) {
7632 for (i = prevvalue; i <= ceilvalue; i++)
7634 ANYOF_BITMAP_SET(ret, i);
7636 for (i = prevvalue; i <= ceilvalue; i++)
7638 ANYOF_BITMAP_SET(ret, i);
7643 for (i = prevvalue; i <= ceilvalue; i++) {
7644 if (!ANYOF_BITMAP_TEST(ret,i)) {
7646 ANYOF_BITMAP_SET(ret, i);
7650 if (value > 255 || UTF) {
7651 const UV prevnatvalue = NATIVE_TO_UNI(prevvalue);
7652 const UV natvalue = NATIVE_TO_UNI(value);
7653 stored+=2; /* can't optimize this class */
7654 ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
7655 if (prevnatvalue < natvalue) { /* what about > ? */
7656 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\t%04"UVxf"\n",
7657 prevnatvalue, natvalue);
7659 else if (prevnatvalue == natvalue) {
7660 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n", natvalue);
7662 U8 foldbuf[UTF8_MAXBYTES_CASE+1];
7664 const UV f = to_uni_fold(natvalue, foldbuf, &foldlen);
7666 #ifdef EBCDIC /* RD t/uni/fold ff and 6b */
7667 if (RExC_precomp[0] == ':' &&
7668 RExC_precomp[1] == '[' &&
7669 (f == 0xDF || f == 0x92)) {
7670 f = NATIVE_TO_UNI(f);
7673 /* If folding and foldable and a single
7674 * character, insert also the folded version
7675 * to the charclass. */
7677 #ifdef EBCDIC /* RD tunifold ligatures s,t fb05, fb06 */
7678 if ((RExC_precomp[0] == ':' &&
7679 RExC_precomp[1] == '[' &&
7681 (value == 0xFB05 || value == 0xFB06))) ?
7682 foldlen == ((STRLEN)UNISKIP(f) - 1) :
7683 foldlen == (STRLEN)UNISKIP(f) )
7685 if (foldlen == (STRLEN)UNISKIP(f))
7687 Perl_sv_catpvf(aTHX_ listsv,
7690 /* Any multicharacter foldings
7691 * require the following transform:
7692 * [ABCDEF] -> (?:[ABCabcDEFd]|pq|rst)
7693 * where E folds into "pq" and F folds
7694 * into "rst", all other characters
7695 * fold to single characters. We save
7696 * away these multicharacter foldings,
7697 * to be later saved as part of the
7698 * additional "s" data. */
7701 if (!unicode_alternate)
7702 unicode_alternate = newAV();
7703 sv = newSVpvn((char*)foldbuf, foldlen);
7705 av_push(unicode_alternate, sv);
7709 /* If folding and the value is one of the Greek
7710 * sigmas insert a few more sigmas to make the
7711 * folding rules of the sigmas to work right.
7712 * Note that not all the possible combinations
7713 * are handled here: some of them are handled
7714 * by the standard folding rules, and some of
7715 * them (literal or EXACTF cases) are handled
7716 * during runtime in regexec.c:S_find_byclass(). */
7717 if (value == UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA) {
7718 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
7719 (UV)UNICODE_GREEK_CAPITAL_LETTER_SIGMA);
7720 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
7721 (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA);
7723 else if (value == UNICODE_GREEK_CAPITAL_LETTER_SIGMA)
7724 Perl_sv_catpvf(aTHX_ listsv, "%04"UVxf"\n",
7725 (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA);
7730 literal_endpoint = 0;
7734 range = 0; /* this range (if it was one) is done now */
7738 ANYOF_FLAGS(ret) |= ANYOF_LARGE;
7740 RExC_size += ANYOF_CLASS_ADD_SKIP;
7742 RExC_emit += ANYOF_CLASS_ADD_SKIP;
7748 /****** !SIZE_ONLY AFTER HERE *********/
7750 if( stored == 1 && value < 256
7751 && !( ANYOF_FLAGS(ret) & ( ANYOF_FLAGS_ALL ^ ANYOF_FOLD ) )
7753 /* optimize single char class to an EXACT node
7754 but *only* when its not a UTF/high char */
7755 const char * cur_parse= RExC_parse;
7756 RExC_emit = (regnode *)orig_emit;
7757 RExC_parse = (char *)orig_parse;
7758 ret = reg_node(pRExC_state,
7759 (U8)((ANYOF_FLAGS(ret) & ANYOF_FOLD) ? EXACTF : EXACT));
7760 RExC_parse = (char *)cur_parse;
7761 *STRING(ret)= (char)value;
7763 RExC_emit += STR_SZ(1);
7766 /* optimize case-insensitive simple patterns (e.g. /[a-z]/i) */
7767 if ( /* If the only flag is folding (plus possibly inversion). */
7768 ((ANYOF_FLAGS(ret) & (ANYOF_FLAGS_ALL ^ ANYOF_INVERT)) == ANYOF_FOLD)
7770 for (value = 0; value < 256; ++value) {
7771 if (ANYOF_BITMAP_TEST(ret, value)) {
7772 UV fold = PL_fold[value];
7775 ANYOF_BITMAP_SET(ret, fold);
7778 ANYOF_FLAGS(ret) &= ~ANYOF_FOLD;
7781 /* optimize inverted simple patterns (e.g. [^a-z]) */
7782 if (optimize_invert &&
7783 /* If the only flag is inversion. */
7784 (ANYOF_FLAGS(ret) & ANYOF_FLAGS_ALL) == ANYOF_INVERT) {
7785 for (value = 0; value < ANYOF_BITMAP_SIZE; ++value)
7786 ANYOF_BITMAP(ret)[value] ^= ANYOF_FLAGS_ALL;
7787 ANYOF_FLAGS(ret) = ANYOF_UNICODE_ALL;
7790 AV * const av = newAV();
7792 /* The 0th element stores the character class description
7793 * in its textual form: used later (regexec.c:Perl_regclass_swash())
7794 * to initialize the appropriate swash (which gets stored in
7795 * the 1st element), and also useful for dumping the regnode.
7796 * The 2nd element stores the multicharacter foldings,
7797 * used later (regexec.c:S_reginclass()). */
7798 av_store(av, 0, listsv);
7799 av_store(av, 1, NULL);
7800 av_store(av, 2, (SV*)unicode_alternate);
7801 rv = newRV_noinc((SV*)av);
7802 n = add_data(pRExC_state, 1, "s");
7803 RExC_rxi->data->data[n] = (void*)rv;
7811 /* reg_skipcomment()
7813 Absorbs an /x style # comments from the input stream.
7814 Returns true if there is more text remaining in the stream.
7815 Will set the REG_SEEN_RUN_ON_COMMENT flag if the comment
7816 terminates the pattern without including a newline.
7818 Note its the callers responsibility to ensure that we are
7824 S_reg_skipcomment(pTHX_ RExC_state_t *pRExC_state)
7827 while (RExC_parse < RExC_end)
7828 if (*RExC_parse++ == '\n') {
7833 /* we ran off the end of the pattern without ending
7834 the comment, so we have to add an \n when wrapping */
7835 RExC_seen |= REG_SEEN_RUN_ON_COMMENT;
7843 Advance that parse position, and optionall absorbs
7844 "whitespace" from the inputstream.
7846 Without /x "whitespace" means (?#...) style comments only,
7847 with /x this means (?#...) and # comments and whitespace proper.
7849 Returns the RExC_parse point from BEFORE the scan occurs.
7851 This is the /x friendly way of saying RExC_parse++.
7855 S_nextchar(pTHX_ RExC_state_t *pRExC_state)
7857 char* const retval = RExC_parse++;
7860 if (*RExC_parse == '(' && RExC_parse[1] == '?' &&
7861 RExC_parse[2] == '#') {
7862 while (*RExC_parse != ')') {
7863 if (RExC_parse == RExC_end)
7864 FAIL("Sequence (?#... not terminated");
7870 if (RExC_flags & RXf_PMf_EXTENDED) {
7871 if (isSPACE(*RExC_parse)) {
7875 else if (*RExC_parse == '#') {
7876 if ( reg_skipcomment( pRExC_state ) )
7885 - reg_node - emit a node
7887 STATIC regnode * /* Location. */
7888 S_reg_node(pTHX_ RExC_state_t *pRExC_state, U8 op)
7891 register regnode *ptr;
7892 regnode * const ret = RExC_emit;
7893 GET_RE_DEBUG_FLAGS_DECL;
7896 SIZE_ALIGN(RExC_size);
7901 if (OP(RExC_emit) == 255)
7902 Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %s: %d ",
7903 reg_name[op], OP(RExC_emit));
7905 NODE_ALIGN_FILL(ret);
7907 FILL_ADVANCE_NODE(ptr, op);
7908 #ifdef RE_TRACK_PATTERN_OFFSETS
7909 if (RExC_offsets) { /* MJD */
7910 MJD_OFFSET_DEBUG(("%s:%d: (op %s) %s %"UVuf" (len %"UVuf") (max %"UVuf").\n",
7911 "reg_node", __LINE__,
7913 (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0]
7914 ? "Overwriting end of array!\n" : "OK",
7915 (UV)(RExC_emit - RExC_emit_start),
7916 (UV)(RExC_parse - RExC_start),
7917 (UV)RExC_offsets[0]));
7918 Set_Node_Offset(RExC_emit, RExC_parse + (op == END));
7926 - reganode - emit a node with an argument
7928 STATIC regnode * /* Location. */
7929 S_reganode(pTHX_ RExC_state_t *pRExC_state, U8 op, U32 arg)
7932 register regnode *ptr;
7933 regnode * const ret = RExC_emit;
7934 GET_RE_DEBUG_FLAGS_DECL;
7937 SIZE_ALIGN(RExC_size);
7942 assert(2==regarglen[op]+1);
7944 Anything larger than this has to allocate the extra amount.
7945 If we changed this to be:
7947 RExC_size += (1 + regarglen[op]);
7949 then it wouldn't matter. Its not clear what side effect
7950 might come from that so its not done so far.
7956 if (OP(RExC_emit) == 255)
7957 Perl_croak(aTHX_ "panic: reganode overwriting end of allocated program space");
7959 NODE_ALIGN_FILL(ret);
7961 FILL_ADVANCE_NODE_ARG(ptr, op, arg);
7962 #ifdef RE_TRACK_PATTERN_OFFSETS
7963 if (RExC_offsets) { /* MJD */
7964 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
7968 (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0] ?
7969 "Overwriting end of array!\n" : "OK",
7970 (UV)(RExC_emit - RExC_emit_start),
7971 (UV)(RExC_parse - RExC_start),
7972 (UV)RExC_offsets[0]));
7973 Set_Cur_Node_Offset;
7981 - reguni - emit (if appropriate) a Unicode character
7984 S_reguni(pTHX_ const RExC_state_t *pRExC_state, UV uv, char* s)
7987 return SIZE_ONLY ? UNISKIP(uv) : (uvchr_to_utf8((U8*)s, uv) - (U8*)s);
7991 - reginsert - insert an operator in front of already-emitted operand
7993 * Means relocating the operand.
7996 S_reginsert(pTHX_ RExC_state_t *pRExC_state, U8 op, regnode *opnd, U32 depth)
7999 register regnode *src;
8000 register regnode *dst;
8001 register regnode *place;
8002 const int offset = regarglen[(U8)op];
8003 const int size = NODE_STEP_REGNODE + offset;
8004 GET_RE_DEBUG_FLAGS_DECL;
8005 /* (PL_regkind[(U8)op] == CURLY ? EXTRA_STEP_2ARGS : 0); */
8006 DEBUG_PARSE_FMT("inst"," - %s",reg_name[op]);
8015 if (RExC_open_parens) {
8017 DEBUG_PARSE_FMT("inst"," - %"IVdf, (IV)RExC_npar);
8018 for ( paren=0 ; paren < RExC_npar ; paren++ ) {
8019 if ( RExC_open_parens[paren] >= opnd ) {
8020 DEBUG_PARSE_FMT("open"," - %d",size);
8021 RExC_open_parens[paren] += size;
8023 DEBUG_PARSE_FMT("open"," - %s","ok");
8025 if ( RExC_close_parens[paren] >= opnd ) {
8026 DEBUG_PARSE_FMT("close"," - %d",size);
8027 RExC_close_parens[paren] += size;
8029 DEBUG_PARSE_FMT("close"," - %s","ok");
8034 while (src > opnd) {
8035 StructCopy(--src, --dst, regnode);
8036 #ifdef RE_TRACK_PATTERN_OFFSETS
8037 if (RExC_offsets) { /* MJD 20010112 */
8038 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s copy %"UVuf" -> %"UVuf" (max %"UVuf").\n",
8042 (UV)(dst - RExC_emit_start) > RExC_offsets[0]
8043 ? "Overwriting end of array!\n" : "OK",
8044 (UV)(src - RExC_emit_start),
8045 (UV)(dst - RExC_emit_start),
8046 (UV)RExC_offsets[0]));
8047 Set_Node_Offset_To_R(dst-RExC_emit_start, Node_Offset(src));
8048 Set_Node_Length_To_R(dst-RExC_emit_start, Node_Length(src));
8054 place = opnd; /* Op node, where operand used to be. */
8055 #ifdef RE_TRACK_PATTERN_OFFSETS
8056 if (RExC_offsets) { /* MJD */
8057 MJD_OFFSET_DEBUG(("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
8061 (UV)(place - RExC_emit_start) > RExC_offsets[0]
8062 ? "Overwriting end of array!\n" : "OK",
8063 (UV)(place - RExC_emit_start),
8064 (UV)(RExC_parse - RExC_start),
8065 (UV)RExC_offsets[0]));
8066 Set_Node_Offset(place, RExC_parse);
8067 Set_Node_Length(place, 1);
8070 src = NEXTOPER(place);
8071 FILL_ADVANCE_NODE(place, op);
8072 Zero(src, offset, regnode);
8076 - regtail - set the next-pointer at the end of a node chain of p to val.
8077 - SEE ALSO: regtail_study
8079 /* TODO: All three parms should be const */
8081 S_regtail(pTHX_ RExC_state_t *pRExC_state, regnode *p, const regnode *val,U32 depth)
8084 register regnode *scan;
8085 GET_RE_DEBUG_FLAGS_DECL;
8087 PERL_UNUSED_ARG(depth);
8093 /* Find last node. */
8096 regnode * const temp = regnext(scan);
8098 SV * const mysv=sv_newmortal();
8099 DEBUG_PARSE_MSG((scan==p ? "tail" : ""));
8100 regprop(RExC_rx, mysv, scan);
8101 PerlIO_printf(Perl_debug_log, "~ %s (%d) %s %s\n",
8102 SvPV_nolen_const(mysv), REG_NODE_NUM(scan),
8103 (temp == NULL ? "->" : ""),
8104 (temp == NULL ? reg_name[OP(val)] : "")
8112 if (reg_off_by_arg[OP(scan)]) {
8113 ARG_SET(scan, val - scan);
8116 NEXT_OFF(scan) = val - scan;
8122 - regtail_study - set the next-pointer at the end of a node chain of p to val.
8123 - Look for optimizable sequences at the same time.
8124 - currently only looks for EXACT chains.
8126 This is expermental code. The idea is to use this routine to perform
8127 in place optimizations on branches and groups as they are constructed,
8128 with the long term intention of removing optimization from study_chunk so
8129 that it is purely analytical.
8131 Currently only used when in DEBUG mode. The macro REGTAIL_STUDY() is used
8132 to control which is which.
8135 /* TODO: All four parms should be const */
8138 S_regtail_study(pTHX_ RExC_state_t *pRExC_state, regnode *p, const regnode *val,U32 depth)
8141 register regnode *scan;
8143 #ifdef EXPERIMENTAL_INPLACESCAN
8147 GET_RE_DEBUG_FLAGS_DECL;
8153 /* Find last node. */
8157 regnode * const temp = regnext(scan);
8158 #ifdef EXPERIMENTAL_INPLACESCAN
8159 if (PL_regkind[OP(scan)] == EXACT)
8160 if (join_exact(pRExC_state,scan,&min,1,val,depth+1))
8168 if( exact == PSEUDO )
8170 else if ( exact != OP(scan) )
8179 SV * const mysv=sv_newmortal();
8180 DEBUG_PARSE_MSG((scan==p ? "tsdy" : ""));
8181 regprop(RExC_rx, mysv, scan);
8182 PerlIO_printf(Perl_debug_log, "~ %s (%d) -> %s\n",
8183 SvPV_nolen_const(mysv),
8192 SV * const mysv_val=sv_newmortal();
8193 DEBUG_PARSE_MSG("");
8194 regprop(RExC_rx, mysv_val, val);
8195 PerlIO_printf(Perl_debug_log, "~ attach to %s (%"IVdf") offset to %"IVdf"\n",
8196 SvPV_nolen_const(mysv_val),
8197 (IV)REG_NODE_NUM(val),
8201 if (reg_off_by_arg[OP(scan)]) {
8202 ARG_SET(scan, val - scan);
8205 NEXT_OFF(scan) = val - scan;
8213 - regcurly - a little FSA that accepts {\d+,?\d*}
8216 S_regcurly(register const char *s)
8235 - regdump - dump a regexp onto Perl_debug_log in vaguely comprehensible form
8238 Perl_regdump(pTHX_ const regexp *r)
8242 SV * const sv = sv_newmortal();
8243 SV *dsv= sv_newmortal();
8246 (void)dumpuntil(r, ri->program, ri->program + 1, NULL, NULL, sv, 0, 0);
8248 /* Header fields of interest. */
8249 if (r->anchored_substr) {
8250 RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->anchored_substr),
8251 RE_SV_DUMPLEN(r->anchored_substr), 30);
8252 PerlIO_printf(Perl_debug_log,
8253 "anchored %s%s at %"IVdf" ",
8254 s, RE_SV_TAIL(r->anchored_substr),
8255 (IV)r->anchored_offset);
8256 } else if (r->anchored_utf8) {
8257 RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->anchored_utf8),
8258 RE_SV_DUMPLEN(r->anchored_utf8), 30);
8259 PerlIO_printf(Perl_debug_log,
8260 "anchored utf8 %s%s at %"IVdf" ",
8261 s, RE_SV_TAIL(r->anchored_utf8),
8262 (IV)r->anchored_offset);
8264 if (r->float_substr) {
8265 RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->float_substr),
8266 RE_SV_DUMPLEN(r->float_substr), 30);
8267 PerlIO_printf(Perl_debug_log,
8268 "floating %s%s at %"IVdf"..%"UVuf" ",
8269 s, RE_SV_TAIL(r->float_substr),
8270 (IV)r->float_min_offset, (UV)r->float_max_offset);
8271 } else if (r->float_utf8) {
8272 RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->float_utf8),
8273 RE_SV_DUMPLEN(r->float_utf8), 30);
8274 PerlIO_printf(Perl_debug_log,
8275 "floating utf8 %s%s at %"IVdf"..%"UVuf" ",
8276 s, RE_SV_TAIL(r->float_utf8),
8277 (IV)r->float_min_offset, (UV)r->float_max_offset);
8279 if (r->check_substr || r->check_utf8)
8280 PerlIO_printf(Perl_debug_log,
8282 (r->check_substr == r->float_substr
8283 && r->check_utf8 == r->float_utf8
8284 ? "(checking floating" : "(checking anchored"));
8285 if (r->extflags & RXf_NOSCAN)
8286 PerlIO_printf(Perl_debug_log, " noscan");
8287 if (r->extflags & RXf_CHECK_ALL)
8288 PerlIO_printf(Perl_debug_log, " isall");
8289 if (r->check_substr || r->check_utf8)
8290 PerlIO_printf(Perl_debug_log, ") ");
8292 if (ri->regstclass) {
8293 regprop(r, sv, ri->regstclass);
8294 PerlIO_printf(Perl_debug_log, "stclass %s ", SvPVX_const(sv));
8296 if (r->extflags & RXf_ANCH) {
8297 PerlIO_printf(Perl_debug_log, "anchored");
8298 if (r->extflags & RXf_ANCH_BOL)
8299 PerlIO_printf(Perl_debug_log, "(BOL)");
8300 if (r->extflags & RXf_ANCH_MBOL)
8301 PerlIO_printf(Perl_debug_log, "(MBOL)");
8302 if (r->extflags & RXf_ANCH_SBOL)
8303 PerlIO_printf(Perl_debug_log, "(SBOL)");
8304 if (r->extflags & RXf_ANCH_GPOS)
8305 PerlIO_printf(Perl_debug_log, "(GPOS)");
8306 PerlIO_putc(Perl_debug_log, ' ');
8308 if (r->extflags & RXf_GPOS_SEEN)
8309 PerlIO_printf(Perl_debug_log, "GPOS:%"UVuf" ", (UV)r->gofs);
8310 if (r->intflags & PREGf_SKIP)
8311 PerlIO_printf(Perl_debug_log, "plus ");
8312 if (r->intflags & PREGf_IMPLICIT)
8313 PerlIO_printf(Perl_debug_log, "implicit ");
8314 PerlIO_printf(Perl_debug_log, "minlen %"IVdf" ", (IV)r->minlen);
8315 if (r->extflags & RXf_EVAL_SEEN)
8316 PerlIO_printf(Perl_debug_log, "with eval ");
8317 PerlIO_printf(Perl_debug_log, "\n");
8319 PERL_UNUSED_CONTEXT;
8321 #endif /* DEBUGGING */
8325 - regprop - printable representation of opcode
8328 Perl_regprop(pTHX_ const regexp *prog, SV *sv, const regnode *o)
8333 RXi_GET_DECL(prog,progi);
8334 GET_RE_DEBUG_FLAGS_DECL;
8337 sv_setpvn(sv, "", 0);
8339 if (OP(o) > REGNODE_MAX) /* regnode.type is unsigned */
8340 /* It would be nice to FAIL() here, but this may be called from
8341 regexec.c, and it would be hard to supply pRExC_state. */
8342 Perl_croak(aTHX_ "Corrupted regexp opcode %d > %d", (int)OP(o), (int)REGNODE_MAX);
8343 sv_catpv(sv, reg_name[OP(o)]); /* Take off const! */
8345 k = PL_regkind[OP(o)];
8348 SV * const dsv = sv_2mortal(newSVpvs(""));
8349 /* Using is_utf8_string() (via PERL_PV_UNI_DETECT)
8350 * is a crude hack but it may be the best for now since
8351 * we have no flag "this EXACTish node was UTF-8"
8353 const char * const s =
8354 pv_pretty(dsv, STRING(o), STR_LEN(o), 60,
8355 PL_colors[0], PL_colors[1],
8356 PERL_PV_ESCAPE_UNI_DETECT |
8357 PERL_PV_PRETTY_ELIPSES |
8360 Perl_sv_catpvf(aTHX_ sv, " %s", s );
8361 } else if (k == TRIE) {
8362 /* print the details of the trie in dumpuntil instead, as
8363 * progi->data isn't available here */
8364 const char op = OP(o);
8365 const U32 n = ARG(o);
8366 const reg_ac_data * const ac = IS_TRIE_AC(op) ?
8367 (reg_ac_data *)progi->data->data[n] :
8369 const reg_trie_data * const trie
8370 = (reg_trie_data*)progi->data->data[!IS_TRIE_AC(op) ? n : ac->trie];
8372 Perl_sv_catpvf(aTHX_ sv, "-%s",reg_name[o->flags]);
8373 DEBUG_TRIE_COMPILE_r(
8374 Perl_sv_catpvf(aTHX_ sv,
8375 "<S:%"UVuf"/%"IVdf" W:%"UVuf" L:%"UVuf"/%"UVuf" C:%"UVuf"/%"UVuf">",
8376 (UV)trie->startstate,
8377 (IV)trie->statecount-1, /* -1 because of the unused 0 element */
8378 (UV)trie->wordcount,
8381 (UV)TRIE_CHARCOUNT(trie),
8382 (UV)trie->uniquecharcount
8385 if ( IS_ANYOF_TRIE(op) || trie->bitmap ) {
8387 int rangestart = -1;
8388 U8* bitmap = IS_ANYOF_TRIE(op) ? (U8*)ANYOF_BITMAP(o) : (U8*)TRIE_BITMAP(trie);
8389 Perl_sv_catpvf(aTHX_ sv, "[");
8390 for (i = 0; i <= 256; i++) {
8391 if (i < 256 && BITMAP_TEST(bitmap,i)) {
8392 if (rangestart == -1)
8394 } else if (rangestart != -1) {
8395 if (i <= rangestart + 3)
8396 for (; rangestart < i; rangestart++)
8397 put_byte(sv, rangestart);
8399 put_byte(sv, rangestart);
8401 put_byte(sv, i - 1);
8406 Perl_sv_catpvf(aTHX_ sv, "]");
8409 } else if (k == CURLY) {
8410 if (OP(o) == CURLYM || OP(o) == CURLYN || OP(o) == CURLYX)
8411 Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* Parenth number */
8412 Perl_sv_catpvf(aTHX_ sv, " {%d,%d}", ARG1(o), ARG2(o));
8414 else if (k == WHILEM && o->flags) /* Ordinal/of */
8415 Perl_sv_catpvf(aTHX_ sv, "[%d/%d]", o->flags & 0xf, o->flags>>4);
8416 else if (k == REF || k == OPEN || k == CLOSE || k == GROUPP || OP(o)==ACCEPT) {
8417 Perl_sv_catpvf(aTHX_ sv, "%d", (int)ARG(o)); /* Parenth number */
8418 if ( prog->paren_names ) {
8419 if ( k != REF || OP(o) < NREF) {
8420 AV *list= (AV *)progi->data->data[progi->name_list_idx];
8421 SV **name= av_fetch(list, ARG(o), 0 );
8423 Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
8426 AV *list= (AV *)progi->data->data[ progi->name_list_idx ];
8427 SV *sv_dat=(SV*)progi->data->data[ ARG( o ) ];
8428 I32 *nums=(I32*)SvPVX(sv_dat);
8429 SV **name= av_fetch(list, nums[0], 0 );
8432 for ( n=0; n<SvIVX(sv_dat); n++ ) {
8433 Perl_sv_catpvf(aTHX_ sv, "%s%"IVdf,
8434 (n ? "," : ""), (IV)nums[n]);
8436 Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
8440 } else if (k == GOSUB)
8441 Perl_sv_catpvf(aTHX_ sv, "%d[%+d]", (int)ARG(o),(int)ARG2L(o)); /* Paren and offset */
8442 else if (k == VERB) {
8444 Perl_sv_catpvf(aTHX_ sv, ":%"SVf,
8445 SVfARG((SV*)progi->data->data[ ARG( o ) ]));
8446 } else if (k == LOGICAL)
8447 Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* 2: embedded, otherwise 1 */
8448 else if (k == ANYOF) {
8449 int i, rangestart = -1;
8450 const U8 flags = ANYOF_FLAGS(o);
8452 /* Should be synchronized with * ANYOF_ #xdefines in regcomp.h */
8453 static const char * const anyofs[] = {
8486 if (flags & ANYOF_LOCALE)
8487 sv_catpvs(sv, "{loc}");
8488 if (flags & ANYOF_FOLD)
8489 sv_catpvs(sv, "{i}");
8490 Perl_sv_catpvf(aTHX_ sv, "[%s", PL_colors[0]);
8491 if (flags & ANYOF_INVERT)
8493 for (i = 0; i <= 256; i++) {
8494 if (i < 256 && ANYOF_BITMAP_TEST(o,i)) {
8495 if (rangestart == -1)
8497 } else if (rangestart != -1) {
8498 if (i <= rangestart + 3)
8499 for (; rangestart < i; rangestart++)
8500 put_byte(sv, rangestart);
8502 put_byte(sv, rangestart);
8504 put_byte(sv, i - 1);
8510 if (o->flags & ANYOF_CLASS)
8511 for (i = 0; i < (int)(sizeof(anyofs)/sizeof(char*)); i++)
8512 if (ANYOF_CLASS_TEST(o,i))
8513 sv_catpv(sv, anyofs[i]);
8515 if (flags & ANYOF_UNICODE)
8516 sv_catpvs(sv, "{unicode}");
8517 else if (flags & ANYOF_UNICODE_ALL)
8518 sv_catpvs(sv, "{unicode_all}");
8522 SV * const sw = regclass_swash(prog, o, FALSE, &lv, 0);
8526 U8 s[UTF8_MAXBYTES_CASE+1];
8528 for (i = 0; i <= 256; i++) { /* just the first 256 */
8529 uvchr_to_utf8(s, i);
8531 if (i < 256 && swash_fetch(sw, s, TRUE)) {
8532 if (rangestart == -1)
8534 } else if (rangestart != -1) {
8535 if (i <= rangestart + 3)
8536 for (; rangestart < i; rangestart++) {
8537 const U8 * const e = uvchr_to_utf8(s,rangestart);
8539 for(p = s; p < e; p++)
8543 const U8 *e = uvchr_to_utf8(s,rangestart);
8545 for (p = s; p < e; p++)
8548 e = uvchr_to_utf8(s, i-1);
8549 for (p = s; p < e; p++)
8556 sv_catpvs(sv, "..."); /* et cetera */
8560 char *s = savesvpv(lv);
8561 char * const origs = s;
8563 while (*s && *s != '\n')
8567 const char * const t = ++s;
8585 Perl_sv_catpvf(aTHX_ sv, "%s]", PL_colors[1]);
8587 else if (k == BRANCHJ && (OP(o) == UNLESSM || OP(o) == IFMATCH))
8588 Perl_sv_catpvf(aTHX_ sv, "[%d]", -(o->flags));
8590 PERL_UNUSED_CONTEXT;
8591 PERL_UNUSED_ARG(sv);
8593 PERL_UNUSED_ARG(prog);
8594 #endif /* DEBUGGING */
8598 Perl_re_intuit_string(pTHX_ regexp *prog)
8599 { /* Assume that RE_INTUIT is set */
8601 GET_RE_DEBUG_FLAGS_DECL;
8602 PERL_UNUSED_CONTEXT;
8606 const char * const s = SvPV_nolen_const(prog->check_substr
8607 ? prog->check_substr : prog->check_utf8);
8609 if (!PL_colorset) reginitcolors();
8610 PerlIO_printf(Perl_debug_log,
8611 "%sUsing REx %ssubstr:%s \"%s%.60s%s%s\"\n",
8613 prog->check_substr ? "" : "utf8 ",
8614 PL_colors[5],PL_colors[0],
8617 (strlen(s) > 60 ? "..." : ""));
8620 return prog->check_substr ? prog->check_substr : prog->check_utf8;
8626 handles refcounting and freeing the perl core regexp structure. When
8627 it is necessary to actually free the structure the first thing it
8628 does is call the 'free' method of the regexp_engine associated to to
8629 the regexp, allowing the handling of the void *pprivate; member
8630 first. (This routine is not overridable by extensions, which is why
8631 the extensions free is called first.)
8633 See regdupe and regdupe_internal if you change anything here.
8635 #ifndef PERL_IN_XSUB_RE
8637 Perl_pregfree(pTHX_ struct regexp *r)
8640 GET_RE_DEBUG_FLAGS_DECL;
8642 if (!r || (--r->refcnt > 0))
8645 CALLREGFREE_PVT(r); /* free the private data */
8646 RX_MATCH_COPY_FREE(r);
8647 #ifdef PERL_OLD_COPY_ON_WRITE
8649 SvREFCNT_dec(r->saved_copy);
8652 if (r->anchored_substr)
8653 SvREFCNT_dec(r->anchored_substr);
8654 if (r->anchored_utf8)
8655 SvREFCNT_dec(r->anchored_utf8);
8656 if (r->float_substr)
8657 SvREFCNT_dec(r->float_substr);
8659 SvREFCNT_dec(r->float_utf8);
8660 Safefree(r->substrs);
8663 SvREFCNT_dec(r->paren_names);
8664 Safefree(r->wrapped);
8665 Safefree(r->startp);
8671 /* regfree_internal()
8673 Free the private data in a regexp. This is overloadable by
8674 extensions. Perl takes care of the regexp structure in pregfree(),
8675 this covers the *pprivate pointer which technically perldoesnt
8676 know about, however of course we have to handle the
8677 regexp_internal structure when no extension is in use.
8679 Note this is called before freeing anything in the regexp
8684 Perl_regfree_internal(pTHX_ struct regexp *r)
8688 GET_RE_DEBUG_FLAGS_DECL;
8694 SV *dsv= sv_newmortal();
8695 RE_PV_QUOTED_DECL(s, (r->extflags & RXf_UTF8),
8696 dsv, r->precomp, r->prelen, 60);
8697 PerlIO_printf(Perl_debug_log,"%sFreeing REx:%s %s\n",
8698 PL_colors[4],PL_colors[5],s);
8701 #ifdef RE_TRACK_PATTERN_OFFSETS
8703 Safefree(ri->u.offsets); /* 20010421 MJD */
8706 int n = ri->data->count;
8707 PAD* new_comppad = NULL;
8712 /* If you add a ->what type here, update the comment in regcomp.h */
8713 switch (ri->data->what[n]) {
8717 SvREFCNT_dec((SV*)ri->data->data[n]);
8720 Safefree(ri->data->data[n]);
8723 new_comppad = (AV*)ri->data->data[n];
8726 if (new_comppad == NULL)
8727 Perl_croak(aTHX_ "panic: pregfree comppad");
8728 PAD_SAVE_LOCAL(old_comppad,
8729 /* Watch out for global destruction's random ordering. */
8730 (SvTYPE(new_comppad) == SVt_PVAV) ? new_comppad : NULL
8733 refcnt = OpREFCNT_dec((OP_4tree*)ri->data->data[n]);
8736 op_free((OP_4tree*)ri->data->data[n]);
8738 PAD_RESTORE_LOCAL(old_comppad);
8739 SvREFCNT_dec((SV*)new_comppad);
8745 { /* Aho Corasick add-on structure for a trie node.
8746 Used in stclass optimization only */
8748 reg_ac_data *aho=(reg_ac_data*)ri->data->data[n];
8750 refcount = --aho->refcount;
8753 PerlMemShared_free(aho->states);
8754 PerlMemShared_free(aho->fail);
8755 /* do this last!!!! */
8756 PerlMemShared_free(ri->data->data[n]);
8757 PerlMemShared_free(ri->regstclass);
8763 /* trie structure. */
8765 reg_trie_data *trie=(reg_trie_data*)ri->data->data[n];
8767 refcount = --trie->refcount;
8770 PerlMemShared_free(trie->charmap);
8771 PerlMemShared_free(trie->states);
8772 PerlMemShared_free(trie->trans);
8774 PerlMemShared_free(trie->bitmap);
8776 PerlMemShared_free(trie->wordlen);
8778 PerlMemShared_free(trie->jump);
8780 PerlMemShared_free(trie->nextword);
8781 /* do this last!!!! */
8782 PerlMemShared_free(ri->data->data[n]);
8787 Perl_croak(aTHX_ "panic: regfree data code '%c'", ri->data->what[n]);
8790 Safefree(ri->data->what);
8794 Safefree(ri->swap->startp);
8795 Safefree(ri->swap->endp);
8801 #define sv_dup_inc(s,t) SvREFCNT_inc(sv_dup(s,t))
8802 #define av_dup_inc(s,t) (AV*)SvREFCNT_inc(sv_dup((SV*)s,t))
8803 #define hv_dup_inc(s,t) (HV*)SvREFCNT_inc(sv_dup((SV*)s,t))
8804 #define SAVEPVN(p,n) ((p) ? savepvn(p,n) : NULL)
8807 regdupe - duplicate a regexp.
8809 This routine is called by sv.c's re_dup and is expected to clone a
8810 given regexp structure. It is a no-op when not under USE_ITHREADS.
8811 (Originally this *was* re_dup() for change history see sv.c)
8813 After all of the core data stored in struct regexp is duplicated
8814 the regexp_engine.dupe method is used to copy any private data
8815 stored in the *pprivate pointer. This allows extensions to handle
8816 any duplication it needs to do.
8818 See pregfree() and regfree_internal() if you change anything here.
8820 #if defined(USE_ITHREADS)
8821 #ifndef PERL_IN_XSUB_RE
8823 Perl_re_dup(pTHX_ const regexp *r, CLONE_PARAMS *param)
8828 struct reg_substr_datum *s;
8831 return (REGEXP *)NULL;
8833 if ((ret = (REGEXP *)ptr_table_fetch(PL_ptr_table, r)))
8837 npar = r->nparens+1;
8838 Newxz(ret, 1, regexp);
8839 Newx(ret->startp, npar, I32);
8840 Copy(r->startp, ret->startp, npar, I32);
8841 Newx(ret->endp, npar, I32);
8842 Copy(r->endp, ret->endp, npar, I32);
8845 Newx(ret->substrs, 1, struct reg_substr_data);
8846 for (s = ret->substrs->data, i = 0; i < 3; i++, s++) {
8847 s->min_offset = r->substrs->data[i].min_offset;
8848 s->max_offset = r->substrs->data[i].max_offset;
8849 s->end_shift = r->substrs->data[i].end_shift;
8850 s->substr = sv_dup_inc(r->substrs->data[i].substr, param);
8851 s->utf8_substr = sv_dup_inc(r->substrs->data[i].utf8_substr, param);
8854 ret->substrs = NULL;
8856 ret->wrapped = SAVEPVN(r->wrapped, r->wraplen);
8857 ret->precomp = ret->wrapped + (r->precomp - r->wrapped);
8858 ret->prelen = r->prelen;
8859 ret->wraplen = r->wraplen;
8861 ret->refcnt = r->refcnt;
8862 ret->minlen = r->minlen;
8863 ret->minlenret = r->minlenret;
8864 ret->nparens = r->nparens;
8865 ret->lastparen = r->lastparen;
8866 ret->lastcloseparen = r->lastcloseparen;
8867 ret->intflags = r->intflags;
8868 ret->extflags = r->extflags;
8870 ret->sublen = r->sublen;
8872 ret->engine = r->engine;
8874 ret->paren_names = hv_dup_inc(r->paren_names, param);
8876 if (RX_MATCH_COPIED(ret))
8877 ret->subbeg = SAVEPVN(r->subbeg, r->sublen);
8880 #ifdef PERL_OLD_COPY_ON_WRITE
8881 ret->saved_copy = NULL;
8884 ret->pprivate = r->pprivate;
8886 RXi_SET(ret,CALLREGDUPE_PVT(ret,param));
8888 ptr_table_store(PL_ptr_table, r, ret);
8891 #endif /* PERL_IN_XSUB_RE */
8896 This is the internal complement to regdupe() which is used to copy
8897 the structure pointed to by the *pprivate pointer in the regexp.
8898 This is the core version of the extension overridable cloning hook.
8899 The regexp structure being duplicated will be copied by perl prior
8900 to this and will be provided as the regexp *r argument, however
8901 with the /old/ structures pprivate pointer value. Thus this routine
8902 may override any copying normally done by perl.
8904 It returns a pointer to the new regexp_internal structure.
8908 Perl_regdupe_internal(pTHX_ const regexp *r, CLONE_PARAMS *param)
8911 regexp_internal *reti;
8915 npar = r->nparens+1;
8918 Newxc(reti, sizeof(regexp_internal) + (len+1)*sizeof(regnode), char, regexp_internal);
8919 Copy(ri->program, reti->program, len+1, regnode);
8922 Newx(reti->swap, 1, regexp_paren_ofs);
8923 /* no need to copy these */
8924 Newx(reti->swap->startp, npar, I32);
8925 Newx(reti->swap->endp, npar, I32);
8930 reti->regstclass = NULL;
8934 const int count = ri->data->count;
8937 Newxc(d, sizeof(struct reg_data) + count*sizeof(void *),
8938 char, struct reg_data);
8939 Newx(d->what, count, U8);
8942 for (i = 0; i < count; i++) {
8943 d->what[i] = ri->data->what[i];
8944 switch (d->what[i]) {
8945 /* legal options are one of: sSfpontTu
8946 see also regcomp.h and pregfree() */
8949 case 'p': /* actually an AV, but the dup function is identical. */
8950 case 'u': /* actually an HV, but the dup function is identical. */
8951 d->data[i] = sv_dup_inc((SV *)ri->data->data[i], param);
8954 /* This is cheating. */
8955 Newx(d->data[i], 1, struct regnode_charclass_class);
8956 StructCopy(ri->data->data[i], d->data[i],
8957 struct regnode_charclass_class);
8958 reti->regstclass = (regnode*)d->data[i];
8961 /* Compiled op trees are readonly and in shared memory,
8962 and can thus be shared without duplication. */
8964 d->data[i] = (void*)OpREFCNT_inc((OP*)ri->data->data[i]);
8968 /* Trie stclasses are readonly and can thus be shared
8969 * without duplication. We free the stclass in pregfree
8970 * when the corresponding reg_ac_data struct is freed.
8972 reti->regstclass= ri->regstclass;
8976 ((reg_trie_data*)ri->data->data[i])->refcount++;
8980 d->data[i] = ri->data->data[i];
8983 Perl_croak(aTHX_ "panic: re_dup unknown data code '%c'", ri->data->what[i]);
8992 reti->name_list_idx = ri->name_list_idx;
8994 #ifdef RE_TRACK_PATTERN_OFFSETS
8995 if (ri->u.offsets) {
8996 Newx(reti->u.offsets, 2*len+1, U32);
8997 Copy(ri->u.offsets, reti->u.offsets, 2*len+1, U32);
9000 SetProgLen(reti,len);
9006 #endif /* USE_ITHREADS */
9011 converts a regexp embedded in a MAGIC struct to its stringified form,
9012 caching the converted form in the struct and returns the cached
9015 If lp is nonnull then it is used to return the length of the
9018 If flags is nonnull and the returned string contains UTF8 then
9019 (*flags & 1) will be true.
9021 If haseval is nonnull then it is used to return whether the pattern
9024 Normally called via macro:
9026 CALLREG_STRINGIFY(mg,&len,&utf8);
9030 CALLREG_AS_STR(mg,&lp,&flags,&haseval)
9032 See sv_2pv_flags() in sv.c for an example of internal usage.
9035 #ifndef PERL_IN_XSUB_RE
9038 Perl_reg_stringify(pTHX_ MAGIC *mg, STRLEN *lp, U32 *flags, I32 *haseval ) {
9040 const regexp * const re = (regexp *)mg->mg_obj;
9042 *haseval = re->seen_evals;
9044 *flags = ((re->extflags & RXf_UTF8) ? 1 : 0);
9051 - regnext - dig the "next" pointer out of a node
9054 Perl_regnext(pTHX_ register regnode *p)
9057 register I32 offset;
9062 offset = (reg_off_by_arg[OP(p)] ? ARG(p) : NEXT_OFF(p));
9071 S_re_croak2(pTHX_ const char* pat1,const char* pat2,...)
9074 STRLEN l1 = strlen(pat1);
9075 STRLEN l2 = strlen(pat2);
9078 const char *message;
9084 Copy(pat1, buf, l1 , char);
9085 Copy(pat2, buf + l1, l2 , char);
9086 buf[l1 + l2] = '\n';
9087 buf[l1 + l2 + 1] = '\0';
9089 /* ANSI variant takes additional second argument */
9090 va_start(args, pat2);
9094 msv = vmess(buf, &args);
9096 message = SvPV_const(msv,l1);
9099 Copy(message, buf, l1 , char);
9100 buf[l1-1] = '\0'; /* Overwrite \n */
9101 Perl_croak(aTHX_ "%s", buf);
9104 /* XXX Here's a total kludge. But we need to re-enter for swash routines. */
9106 #ifndef PERL_IN_XSUB_RE
9108 Perl_save_re_context(pTHX)
9112 struct re_save_state *state;
9114 SAVEVPTR(PL_curcop);
9115 SSGROW(SAVESTACK_ALLOC_FOR_RE_SAVE_STATE + 1);
9117 state = (struct re_save_state *)(PL_savestack + PL_savestack_ix);
9118 PL_savestack_ix += SAVESTACK_ALLOC_FOR_RE_SAVE_STATE;
9119 SSPUSHINT(SAVEt_RE_STATE);
9121 Copy(&PL_reg_state, state, 1, struct re_save_state);
9123 PL_reg_start_tmp = 0;
9124 PL_reg_start_tmpl = 0;
9125 PL_reg_oldsaved = NULL;
9126 PL_reg_oldsavedlen = 0;
9128 PL_reg_leftiter = 0;
9129 PL_reg_poscache = NULL;
9130 PL_reg_poscache_size = 0;
9131 #ifdef PERL_OLD_COPY_ON_WRITE
9135 /* Save $1..$n (#18107: UTF-8 s/(\w+)/uc($1)/e); AMS 20021106. */
9137 const REGEXP * const rx = PM_GETRE(PL_curpm);
9140 for (i = 1; i <= rx->nparens; i++) {
9141 char digits[TYPE_CHARS(long)];
9142 const STRLEN len = my_snprintf(digits, sizeof(digits), "%lu", (long)i);
9143 GV *const *const gvp
9144 = (GV**)hv_fetch(PL_defstash, digits, len, 0);
9147 GV * const gv = *gvp;
9148 if (SvTYPE(gv) == SVt_PVGV && GvSV(gv))
9158 clear_re(pTHX_ void *r)
9161 ReREFCNT_dec((regexp *)r);
9167 S_put_byte(pTHX_ SV *sv, int c)
9169 if (isCNTRL(c) || c == 255 || !isPRINT(c))
9170 Perl_sv_catpvf(aTHX_ sv, "\\%o", c);
9171 else if (c == '-' || c == ']' || c == '\\' || c == '^')
9172 Perl_sv_catpvf(aTHX_ sv, "\\%c", c);
9174 Perl_sv_catpvf(aTHX_ sv, "%c", c);
9178 #define CLEAR_OPTSTART \
9179 if (optstart) STMT_START { \
9180 DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log, " (%"IVdf" nodes)\n", (IV)(node - optstart))); \
9184 #define DUMPUNTIL(b,e) CLEAR_OPTSTART; node=dumpuntil(r,start,(b),(e),last,sv,indent+1,depth+1);
9186 STATIC const regnode *
9187 S_dumpuntil(pTHX_ const regexp *r, const regnode *start, const regnode *node,
9188 const regnode *last, const regnode *plast,
9189 SV* sv, I32 indent, U32 depth)
9192 register U8 op = PSEUDO; /* Arbitrary non-END op. */
9193 register const regnode *next;
9194 const regnode *optstart= NULL;
9197 GET_RE_DEBUG_FLAGS_DECL;
9199 #ifdef DEBUG_DUMPUNTIL
9200 PerlIO_printf(Perl_debug_log, "--- %d : %d - %d - %d\n",indent,node-start,
9201 last ? last-start : 0,plast ? plast-start : 0);
9204 if (plast && plast < last)
9207 while (PL_regkind[op] != END && (!last || node < last)) {
9208 /* While that wasn't END last time... */
9211 if (op == CLOSE || op == WHILEM)
9213 next = regnext((regnode *)node);
9216 if (OP(node) == OPTIMIZED) {
9217 if (!optstart && RE_DEBUG_FLAG(RE_DEBUG_COMPILE_OPTIMISE))
9224 regprop(r, sv, node);
9225 PerlIO_printf(Perl_debug_log, "%4"IVdf":%*s%s", (IV)(node - start),
9226 (int)(2*indent + 1), "", SvPVX_const(sv));
9228 if (OP(node) != OPTIMIZED) {
9229 if (next == NULL) /* Next ptr. */
9230 PerlIO_printf(Perl_debug_log, " (0)");
9231 else if (PL_regkind[(U8)op] == BRANCH && PL_regkind[OP(next)] != BRANCH )
9232 PerlIO_printf(Perl_debug_log, " (FAIL)");
9234 PerlIO_printf(Perl_debug_log, " (%"IVdf")", (IV)(next - start));
9235 (void)PerlIO_putc(Perl_debug_log, '\n');
9239 if (PL_regkind[(U8)op] == BRANCHJ) {
9242 register const regnode *nnode = (OP(next) == LONGJMP
9243 ? regnext((regnode *)next)
9245 if (last && nnode > last)
9247 DUMPUNTIL(NEXTOPER(NEXTOPER(node)), nnode);
9250 else if (PL_regkind[(U8)op] == BRANCH) {
9252 DUMPUNTIL(NEXTOPER(node), next);
9254 else if ( PL_regkind[(U8)op] == TRIE ) {
9255 const regnode *this_trie = node;
9256 const char op = OP(node);
9257 const U32 n = ARG(node);
9258 const reg_ac_data * const ac = op>=AHOCORASICK ?
9259 (reg_ac_data *)ri->data->data[n] :
9261 const reg_trie_data * const trie =
9262 (reg_trie_data*)ri->data->data[op<AHOCORASICK ? n : ac->trie];
9264 AV *const trie_words = (AV *) ri->data->data[n + TRIE_WORDS_OFFSET];
9266 const regnode *nextbranch= NULL;
9268 sv_setpvn(sv, "", 0);
9269 for (word_idx= 0; word_idx < (I32)trie->wordcount; word_idx++) {
9270 SV ** const elem_ptr = av_fetch(trie_words,word_idx,0);
9272 PerlIO_printf(Perl_debug_log, "%*s%s ",
9273 (int)(2*(indent+3)), "",
9274 elem_ptr ? pv_pretty(sv, SvPV_nolen_const(*elem_ptr), SvCUR(*elem_ptr), 60,
9275 PL_colors[0], PL_colors[1],
9276 (SvUTF8(*elem_ptr) ? PERL_PV_ESCAPE_UNI : 0) |
9277 PERL_PV_PRETTY_ELIPSES |
9283 U16 dist= trie->jump[word_idx+1];
9284 PerlIO_printf(Perl_debug_log, "(%"UVuf")\n",
9285 (UV)((dist ? this_trie + dist : next) - start));
9288 nextbranch= this_trie + trie->jump[0];
9289 DUMPUNTIL(this_trie + dist, nextbranch);
9291 if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
9292 nextbranch= regnext((regnode *)nextbranch);
9294 PerlIO_printf(Perl_debug_log, "\n");
9297 if (last && next > last)
9302 else if ( op == CURLY ) { /* "next" might be very big: optimizer */
9303 DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS,
9304 NEXTOPER(node) + EXTRA_STEP_2ARGS + 1);
9306 else if (PL_regkind[(U8)op] == CURLY && op != CURLYX) {
9308 DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS, next);
9310 else if ( op == PLUS || op == STAR) {
9311 DUMPUNTIL(NEXTOPER(node), NEXTOPER(node) + 1);
9313 else if (op == ANYOF) {
9314 /* arglen 1 + class block */
9315 node += 1 + ((ANYOF_FLAGS(node) & ANYOF_LARGE)
9316 ? ANYOF_CLASS_SKIP : ANYOF_SKIP);
9317 node = NEXTOPER(node);
9319 else if (PL_regkind[(U8)op] == EXACT) {
9320 /* Literal string, where present. */
9321 node += NODE_SZ_STR(node) - 1;
9322 node = NEXTOPER(node);
9325 node = NEXTOPER(node);
9326 node += regarglen[(U8)op];
9328 if (op == CURLYX || op == OPEN)
9332 #ifdef DEBUG_DUMPUNTIL
9333 PerlIO_printf(Perl_debug_log, "--- %d\n", (int)indent);
9338 #endif /* DEBUGGING */
9342 * c-indentation-style: bsd
9344 * indent-tabs-mode: t
9347 * ex: set ts=8 sts=4 sw=4 noet: