3 * Copyright (C) 1993, 1994, 1996, 1997, 1999, 2000, 2001, 2003,
4 * 2005, 2006, 2007, 2008 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * Definitions etc. for regexp(3) routines.
14 * Caveat: this is V8 regexp(3) [actually, a reimplementation thereof],
15 * not the System V one.
17 #ifndef PLUGGABLE_RE_EXTENSION
18 /* we don't want to include this stuff if we are inside of
19 an external regex engine based on the core one - like re 'debug'*/
23 typedef SSize_t regnode_offset;
31 typedef struct regnode regnode;
33 struct reg_substr_data;
40 struct reg_substr_datum {
41 SSize_t min_offset; /* min pos (in chars) that substr must appear */
42 SSize_t max_offset /* max pos (in chars) that substr must appear */;
43 SV *substr; /* non-utf8 variant */
44 SV *utf8_substr; /* utf8 variant */
45 SSize_t end_shift; /* how many fixed chars must end the string */
47 struct reg_substr_data {
48 U8 check_ix; /* index into data[] of check substr */
49 struct reg_substr_datum data[3]; /* Actual array */
53 # define SV_SAVED_COPY SV *saved_copy; /* If non-NULL, SV which is COW from original */
55 # define SV_SAVED_COPY
58 /* offsets within a string of a particular /(.)/ capture */
60 typedef struct regexp_paren_pair {
63 /* 'start_tmp' records a new opening position before the matching end
64 * has been found, so that the old start and end values are still
66 * "abc" =~ /(.(?{print "[$1]"}))+/
68 * This field is not part of the API. */
72 # if defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_UTF8_C)
73 # define _invlist_union(a, b, output) _invlist_union_maybe_complement_2nd(a, b, FALSE, output)
74 # define _invlist_intersection(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, FALSE, output)
76 /* Subtracting b from a leaves in a everything that was there that isn't in b,
77 * that is the intersection of a with b's complement */
78 # define _invlist_subtract(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, TRUE, output)
81 /* record the position of a (?{...}) within a pattern */
83 struct reg_code_block {
90 /* array of reg_code_block's plus header info */
92 struct reg_code_blocks {
93 int refcnt; /* we may be pointed to from a regex and from the savestack */
94 int count; /* how many code blocks */
95 struct reg_code_block *cb; /* array of reg_code_block's */
100 The regexp/REGEXP struct, see L<perlreapi> for further documentation
101 on the individual fields. The struct is ordered so that the most
102 commonly used fields are placed at the start.
104 Any patch that adds items to this struct will need to include
105 changes to F<sv.c> (C<Perl_re_dup()>) and F<regcomp.c>
106 (C<pregfree()>). This involves freeing or cloning items in the
107 regexp's data array based on the data item's type.
110 typedef struct regexp {
112 const struct regexp_engine* engine; /* what engine created this regexp? */
113 REGEXP *mother_re; /* what re is this a lightweight copy of? */
114 HV *paren_names; /* Optional hash of paren names */
116 /*----------------------------------------------------------------------
117 * Information about the match that the perl core uses to manage things
120 U32 extflags; /* Flags used both externally and internally */
121 U32 nparens; /* number of capture buffers */
122 SSize_t minlen; /* minimum possible number of chars in string to match */
123 SSize_t minlenret; /* mininum possible number of chars in $& */
124 STRLEN gofs; /* chars left of pos that we search from */
125 /* substring data about strings that must appear in
126 * the final match, used for optimisations */
127 struct reg_substr_data *substrs;
129 /* private engine specific data */
131 void *pprivate; /* Data private to the regex engine which
132 * created this object. */
133 U32 intflags; /* Engine Specific Internal flags */
135 /*----------------------------------------------------------------------
136 * Data about the last/current match. These are modified during matching
139 U32 lastparen; /* highest close paren matched ($+) */
140 regexp_paren_pair *offs; /* Array of offsets for (@-) and (@+) */
141 char **recurse_locinput; /* used to detect infinite recursion, XXX: move to internal */
142 U32 lastcloseparen; /* last close paren matched ($^N) */
144 /*---------------------------------------------------------------------- */
146 /* offset from wrapped to the start of precomp */
147 PERL_BITFIELD32 pre_prefix:4;
149 /* original flags used to compile the pattern, may differ from
150 * extflags in various ways */
151 PERL_BITFIELD32 compflags:9;
153 /*---------------------------------------------------------------------- */
155 char *subbeg; /* saved or original string so \digit works forever. */
156 SV_SAVED_COPY /* If non-NULL, SV which is COW from original */
157 SSize_t sublen; /* Length of string pointed by subbeg */
158 SSize_t suboffset; /* byte offset of subbeg from logical start of str */
159 SSize_t subcoffset; /* suboffset equiv, but in chars (for @-/@+) */
160 SSize_t maxlen; /* minimum possible number of chars in string to match */
162 /*---------------------------------------------------------------------- */
165 CV *qr_anoncv; /* the anon sub wrapped round qr/(?{..})/ */
169 # define RXp_PAREN_NAMES(rx) ((rx)->paren_names)
171 /* used for high speed searches */
172 typedef struct re_scream_pos_data_s
174 char **scream_olds; /* match pos */
175 SSize_t *scream_pos; /* Internal iterator of scream. */
176 } re_scream_pos_data;
178 /* regexp_engine structure. This is the dispatch table for regexes.
179 * Any regex engine implementation must be able to build one of these.
181 typedef struct regexp_engine {
182 REGEXP* (*comp) (pTHX_ SV * const pattern, U32 flags);
183 I32 (*exec) (pTHX_ REGEXP * const rx, char* stringarg, char* strend,
184 char* strbeg, SSize_t minend, SV* sv,
185 void* data, U32 flags);
186 char* (*intuit) (pTHX_
189 const char * const strbeg,
193 re_scream_pos_data *data);
194 SV* (*checkstr) (pTHX_ REGEXP * const rx);
195 void (*rxfree) (pTHX_ REGEXP * const rx);
196 void (*numbered_buff_FETCH) (pTHX_ REGEXP * const rx, const I32 paren,
198 void (*numbered_buff_STORE) (pTHX_ REGEXP * const rx, const I32 paren,
199 SV const * const value);
200 I32 (*numbered_buff_LENGTH) (pTHX_ REGEXP * const rx, const SV * const sv,
202 SV* (*named_buff) (pTHX_ REGEXP * const rx, SV * const key,
203 SV * const value, const U32 flags);
204 SV* (*named_buff_iter) (pTHX_ REGEXP * const rx, const SV * const lastkey,
206 SV* (*qr_package)(pTHX_ REGEXP * const rx);
208 void* (*dupe) (pTHX_ REGEXP * const rx, CLONE_PARAMS *param);
210 REGEXP* (*op_comp) (pTHX_ SV ** const patternp, int pat_count,
211 OP *expr, const struct regexp_engine* eng,
213 bool *is_bare_re, U32 orig_rx_flags, U32 pm_flags);
217 These are passed to the numbered capture variable callbacks as the
218 paren name. >= 1 is reserved for actual numbered captures, i.e. $1,
221 # define RX_BUFF_IDX_CARET_PREMATCH -5 /* ${^PREMATCH} */
222 # define RX_BUFF_IDX_CARET_POSTMATCH -4 /* ${^POSTMATCH} */
223 # define RX_BUFF_IDX_CARET_FULLMATCH -3 /* ${^MATCH} */
224 # define RX_BUFF_IDX_PREMATCH -2 /* $` */
225 # define RX_BUFF_IDX_POSTMATCH -1 /* $' */
226 # define RX_BUFF_IDX_FULLMATCH 0 /* $& */
229 Flags that are passed to the named_buff and named_buff_iter
230 callbacks above. Those routines are called from universal.c via the
231 Tie::Hash::NamedCapture interface for %+ and %- and the re::
232 functions in the same file.
235 /* The Tie::Hash::NamedCapture operation this is part of, if any */
236 # define RXapif_FETCH 0x0001
237 # define RXapif_STORE 0x0002
238 # define RXapif_DELETE 0x0004
239 # define RXapif_CLEAR 0x0008
240 # define RXapif_EXISTS 0x0010
241 # define RXapif_SCALAR 0x0020
242 # define RXapif_FIRSTKEY 0x0040
243 # define RXapif_NEXTKEY 0x0080
245 /* Whether %+ or %- is being operated on */
246 # define RXapif_ONE 0x0100 /* %+ */
247 # define RXapif_ALL 0x0200 /* %- */
249 /* Whether this is being called from a re:: function */
250 # define RXapif_REGNAME 0x0400
251 # define RXapif_REGNAMES 0x0800
252 # define RXapif_REGNAMES_COUNT 0x1000
255 =for apidoc Am|REGEXP *|SvRX|SV *sv
257 Convenience macro to get the REGEXP from a SV. This is approximately
258 equivalent to the following snippet:
263 sv = MUTABLE_SV(SvRV(sv));
264 if (SvTYPE(sv) == SVt_REGEXP)
267 C<NULL> will be returned if a REGEXP* is not found.
269 =for apidoc Am|bool|SvRXOK|SV* sv
271 Returns a boolean indicating whether the SV (or the one it references)
274 If you want to do something with the REGEXP* later use SvRX instead
280 # define SvRX(sv) (Perl_get_re_arg(aTHX_ sv))
281 # define SvRXOK(sv) cBOOL(Perl_get_re_arg(aTHX_ sv))
284 /* Flags stored in regexp->extflags
285 * These are used by code external to the regexp engine
287 * Note that the flags whose names start with RXf_PMf_ are defined in
288 * op_reg_common.h, being copied from the parallel flags of op_pmflags
290 * NOTE: if you modify any RXf flags you should run regen.pl or
291 * regen/regcomp.pl so that regnodes.h is updated with the changes.
295 # include "op_reg_common.h"
297 # define RXf_PMf_STD_PMMOD (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_FOLD|RXf_PMf_EXTENDED|RXf_PMf_EXTENDED_MORE|RXf_PMf_NOCAPTURE)
299 # define CASE_STD_PMMOD_FLAGS_PARSE_SET(pmfl, x_count) \
300 case IGNORE_PAT_MOD: *(pmfl) |= RXf_PMf_FOLD; break; \
301 case MULTILINE_PAT_MOD: *(pmfl) |= RXf_PMf_MULTILINE; break; \
302 case SINGLE_PAT_MOD: *(pmfl) |= RXf_PMf_SINGLELINE; break; \
303 case XTENDED_PAT_MOD: if (x_count == 0) { \
304 *(pmfl) |= RXf_PMf_EXTENDED; \
305 *(pmfl) &= ~RXf_PMf_EXTENDED_MORE; \
308 *(pmfl) |= RXf_PMf_EXTENDED \
309 |RXf_PMf_EXTENDED_MORE; \
311 (x_count)++; break; \
312 case NOCAPTURE_PAT_MOD: *(pmfl) |= RXf_PMf_NOCAPTURE; break;
314 /* Note, includes charset ones, assumes 0 is the default for them */
315 # define STD_PMMOD_FLAGS_CLEAR(pmfl) \
316 *(pmfl) &= ~(RXf_PMf_FOLD|RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_EXTENDED|RXf_PMf_EXTENDED_MORE|RXf_PMf_CHARSET|RXf_PMf_NOCAPTURE)
318 /* chars and strings used as regex pattern modifiers
319 * Singular is a 'c'har, plural is a "string"
321 * NOTE, KEEPCOPY was originally 'k', but was changed to 'p' for preserve
322 * for compatibility reasons with Regexp::Common which highjacked (?k:...)
323 * for its own uses. So 'k' is out as well.
325 # define DEFAULT_PAT_MOD '^' /* Short for all the default modifiers */
326 # define EXEC_PAT_MOD 'e'
327 # define KEEPCOPY_PAT_MOD 'p'
328 # define NOCAPTURE_PAT_MOD 'n'
329 # define ONCE_PAT_MOD 'o'
330 # define GLOBAL_PAT_MOD 'g'
331 # define CONTINUE_PAT_MOD 'c'
332 # define MULTILINE_PAT_MOD 'm'
333 # define SINGLE_PAT_MOD 's'
334 # define IGNORE_PAT_MOD 'i'
335 # define XTENDED_PAT_MOD 'x'
336 # define NONDESTRUCT_PAT_MOD 'r'
337 # define LOCALE_PAT_MOD 'l'
338 # define UNICODE_PAT_MOD 'u'
339 # define DEPENDS_PAT_MOD 'd'
340 # define ASCII_RESTRICT_PAT_MOD 'a'
342 # define ONCE_PAT_MODS "o"
343 # define KEEPCOPY_PAT_MODS "p"
344 # define NOCAPTURE_PAT_MODS "n"
345 # define EXEC_PAT_MODS "e"
346 # define LOOP_PAT_MODS "gc"
347 # define NONDESTRUCT_PAT_MODS "r"
348 # define LOCALE_PAT_MODS "l"
349 # define UNICODE_PAT_MODS "u"
350 # define DEPENDS_PAT_MODS "d"
351 # define ASCII_RESTRICT_PAT_MODS "a"
352 # define ASCII_MORE_RESTRICT_PAT_MODS "aa"
354 /* This string is expected by regcomp.c to be ordered so that the first
355 * character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of extflags; the next
356 * character is bit +1, etc. */
357 # define STD_PAT_MODS "msixxn"
359 # define CHARSET_PAT_MODS ASCII_RESTRICT_PAT_MODS DEPENDS_PAT_MODS LOCALE_PAT_MODS UNICODE_PAT_MODS
361 /* This string is expected by XS_re_regexp_pattern() in universal.c to be ordered
362 * so that the first character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of
363 * extflags; the next character is in bit +1, etc. */
364 # define INT_PAT_MODS STD_PAT_MODS KEEPCOPY_PAT_MODS
366 # define EXT_PAT_MODS ONCE_PAT_MODS KEEPCOPY_PAT_MODS NOCAPTURE_PAT_MODS
367 # define QR_PAT_MODS STD_PAT_MODS EXT_PAT_MODS CHARSET_PAT_MODS
368 # define M_PAT_MODS QR_PAT_MODS LOOP_PAT_MODS
369 # define S_PAT_MODS M_PAT_MODS EXEC_PAT_MODS NONDESTRUCT_PAT_MODS
372 * NOTE: if you modify any RXf flags you should run regen.pl or
373 * regen/regcomp.pl so that regnodes.h is updated with the changes.
378 Set in Perl_pmruntime for a split. Will be used by regex engines to
379 check whether they should set RXf_SKIPWHITE
381 # define RXf_SPLIT RXf_PMf_SPLIT
383 /* Currently the regex flags occupy a single 32-bit word. Not all bits are
384 * currently used. The lower bits are shared with their corresponding PMf flag
385 * bits, up to but not including _RXf_PMf_SHIFT_NEXT. The unused bits
386 * immediately follow; finally the used RXf-only (unshared) bits, so that the
387 * highest bit in the word is used. This gathers all the unused bits as a pool
388 * in the middle, like so: 11111111111111110000001111111111
389 * where the '1's represent used bits, and the '0's unused. This design allows
390 * us to allocate off one end of the pool if we need to add a shared bit, and
391 * off the other end if we need a non-shared bit, without disturbing the other
392 * bits. This maximizes the likelihood of being able to change things without
393 * breaking binary compatibility.
395 * To add shared bits, do so in op_reg_common.h. This should change
396 * _RXf_PMf_SHIFT_NEXT so that things won't compile. Then come to regexp.h and
397 * op.h and adjust the constant adders in the definitions of RXf_BASE_SHIFT and
398 * Pmf_BASE_SHIFT down by the number of shared bits you added. That's it.
399 * Things should be binary compatible. But if either of these gets to having
400 * to subtract rather than add, leave at 0 and instead adjust all the entries
401 * that are in terms of it. But if the first one of those is already
402 * RXf_BASE_SHIFT+0, there are no bits left, and a redesign is in order.
404 * To remove unshared bits, just delete its entry. If you're where breaking
405 * binary compatibility is ok to do, you might want to adjust things to move
406 * the newly opened space so that it gets absorbed into the common pool.
408 * To add unshared bits, first use up any gaps in the middle. Otherwise,
409 * allocate off the low end until you get to RXf_BASE_SHIFT+0. If that isn't
410 * enough, move RXf_BASE_SHIFT down (if possible) and add the new bit at the
411 * other end instead; this preserves binary compatibility.
413 * For the regexp bits, PL_reg_extflags_name[] in regnodes.h has a comment
414 * giving which bits are used/unused */
416 # define RXf_BASE_SHIFT (_RXf_PMf_SHIFT_NEXT + 2)
418 /* What we have seen */
419 # define RXf_NO_INPLACE_SUBST (1U<<(RXf_BASE_SHIFT+2))
420 # define RXf_EVAL_SEEN (1U<<(RXf_BASE_SHIFT+3))
423 # define RXf_UNBOUNDED_QUANTIFIER_SEEN (1U<<(RXf_BASE_SHIFT+4))
424 # define RXf_CHECK_ALL (1U<<(RXf_BASE_SHIFT+5))
427 # define RXf_MATCH_UTF8 (1U<<(RXf_BASE_SHIFT+6)) /* $1 etc are utf8 */
430 # define RXf_USE_INTUIT_NOML (1U<<(RXf_BASE_SHIFT+7))
431 # define RXf_USE_INTUIT_ML (1U<<(RXf_BASE_SHIFT+8))
432 # define RXf_INTUIT_TAIL (1U<<(RXf_BASE_SHIFT+9))
433 # define RXf_USE_INTUIT (RXf_USE_INTUIT_NOML|RXf_USE_INTUIT_ML)
435 /* Do we have some sort of anchor? */
436 # define RXf_IS_ANCHORED (1U<<(RXf_BASE_SHIFT+10))
438 /* Copy and tainted info */
439 # define RXf_COPY_DONE (1U<<(RXf_BASE_SHIFT+11))
441 /* post-execution: $1 et al are tainted */
442 # define RXf_TAINTED_SEEN (1U<<(RXf_BASE_SHIFT+12))
443 /* this pattern was tainted during compilation */
444 # define RXf_TAINTED (1U<<(RXf_BASE_SHIFT+13))
446 /* Flags indicating special patterns */
447 # define RXf_START_ONLY (1U<<(RXf_BASE_SHIFT+14)) /* Pattern is /^/ */
448 # define RXf_SKIPWHITE (1U<<(RXf_BASE_SHIFT+15)) /* Pattern is for a */
450 # define RXf_WHITE (1U<<(RXf_BASE_SHIFT+16)) /* Pattern is /\s+/ */
451 # define RXf_NULL (1U<<(RXf_BASE_SHIFT+17)) /* Pattern is // */
453 /* See comments at the beginning of these defines about adding bits. The
454 * highest bit position should be used, so that if RXf_BASE_SHIFT gets
455 * increased, the #error below will be triggered so that you will be reminded
456 * to adjust things at the other end to keep the bit positions unchanged */
457 # if RXf_BASE_SHIFT+17 > 31
458 # error Too many RXf_PMf bits used. See comments at beginning of these for what to do
462 * NOTE: if you modify any RXf flags you should run regen.pl or
463 * regen/regcomp.pl so that regnodes.h is updated with the changes.
467 # ifdef NO_TAINT_SUPPORT
468 # define RX_ISTAINTED(rx_sv) 0
469 # define RXp_ISTAINTED(prog) 0
470 # define RX_TAINT_on(rx_sv) NOOP
471 # define RXp_MATCH_TAINTED(prog) 0
472 # define RX_MATCH_TAINTED(rx_sv) 0
473 # define RXp_MATCH_TAINTED_on(prog) NOOP
474 # define RX_MATCH_TAINTED_on(rx_sv) NOOP
475 # define RXp_MATCH_TAINTED_off(prog) NOOP
476 # define RX_MATCH_TAINTED_off(rx_sv) NOOP
478 # define RX_ISTAINTED(rx_sv) (RX_EXTFLAGS(rx_sv) & RXf_TAINTED)
479 # define RXp_ISTAINTED(prog) (RXp_EXTFLAGS(prog) & RXf_TAINTED)
480 # define RX_TAINT_on(rx_sv) (RX_EXTFLAGS(rx_sv) |= RXf_TAINTED)
481 # define RXp_MATCH_TAINTED(prog) (RXp_EXTFLAGS(prog) & RXf_TAINTED_SEEN)
482 # define RX_MATCH_TAINTED(rx_sv) (RX_EXTFLAGS(rx_sv) & RXf_TAINTED_SEEN)
483 # define RXp_MATCH_TAINTED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_TAINTED_SEEN)
484 # define RX_MATCH_TAINTED_on(rx_sv) (RX_EXTFLAGS(rx_sv) |= RXf_TAINTED_SEEN)
485 # define RXp_MATCH_TAINTED_off(prog) (RXp_EXTFLAGS(prog) &= ~RXf_TAINTED_SEEN)
486 # define RX_MATCH_TAINTED_off(rx_sv) (RX_EXTFLAGS(rx_sv) &= ~RXf_TAINTED_SEEN)
489 # define RXp_HAS_CUTGROUP(prog) ((prog)->intflags & PREGf_CUTGROUP_SEEN)
491 # define RX_MATCH_TAINTED_set(rx_sv, t) ((t) \
492 ? RX_MATCH_TAINTED_on(rx_sv) \
493 : RX_MATCH_TAINTED_off(rx_sv))
495 # define RXp_MATCH_COPIED(prog) (RXp_EXTFLAGS(prog) & RXf_COPY_DONE)
496 # define RX_MATCH_COPIED(rx_sv) (RX_EXTFLAGS(rx_sv) & RXf_COPY_DONE)
497 # define RXp_MATCH_COPIED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_COPY_DONE)
498 # define RX_MATCH_COPIED_on(rx_sv) (RX_EXTFLAGS(rx_sv) |= RXf_COPY_DONE)
499 # define RXp_MATCH_COPIED_off(prog) (RXp_EXTFLAGS(prog) &= ~RXf_COPY_DONE)
500 # define RX_MATCH_COPIED_off(rx_sv) (RX_EXTFLAGS(rx_sv) &= ~RXf_COPY_DONE)
501 # define RX_MATCH_COPIED_set(rx_sv,t) ((t) \
502 ? RX_MATCH_COPIED_on(rx_sv) \
503 : RX_MATCH_COPIED_off(rx_sv))
505 # define RXp_EXTFLAGS(rx) ((rx)->extflags)
506 # define RXp_COMPFLAGS(rx) ((rx)->compflags)
508 /* For source compatibility. We used to store these explicitly. */
509 # define RX_PRECOMP(rx_sv) (RX_WRAPPED(rx_sv) \
510 + ReANY(rx_sv)->pre_prefix)
511 # define RX_PRECOMP_const(rx_sv) (RX_WRAPPED_const(rx_sv) \
512 + ReANY(rx_sv)->pre_prefix)
513 /* FIXME? Are we hardcoding too much here and constraining plugin extension
514 writers? Specifically, the value 1 assumes that the wrapped version always
515 has exactly one character at the end, a ')'. Will that always be true? */
516 # define RX_PRELEN(rx_sv) (RX_WRAPLEN(rx_sv) \
517 - ReANY(rx_sv)->pre_prefix - 1)
519 # define RX_WRAPPED(rx_sv) SvPVX(rx_sv)
520 # define RX_WRAPPED_const(rx_sv) SvPVX_const(rx_sv)
521 # define RX_WRAPLEN(rx_sv) SvCUR(rx_sv)
522 # define RX_CHECK_SUBSTR(rx_sv) (ReANY(rx_sv)->check_substr)
523 # define RX_REFCNT(rx_sv) SvREFCNT(rx_sv)
524 # define RX_EXTFLAGS(rx_sv) RXp_EXTFLAGS(ReANY(rx_sv))
525 # define RX_COMPFLAGS(rx_sv) RXp_COMPFLAGS(ReANY(rx_sv))
526 # define RXp_ENGINE(prog) ((prog)->engine)
527 # define RX_ENGINE(rx_sv) (RXp_ENGINE(ReANY(rx_sv)))
528 # define RXp_SUBBEG(prog) (prog->subbeg)
529 # define RX_SUBBEG(rx_sv) (RXp_SUBBEG(ReANY(rx_sv)))
530 # define RXp_SUBOFFSET(prog) (prog->suboffset)
531 # define RX_SUBOFFSET(rx_sv) (RXp_SUBOFFSET(ReANY(rx_sv)))
532 # define RX_SUBCOFFSET(rx_sv) (ReANY(rx_sv)->subcoffset)
533 # define RXp_OFFS(prog) (prog->offs)
534 # define RX_OFFS(rx_sv) (RXp_OFFS(ReANY(rx_sv)))
535 # define RXp_NPARENS(prog) (prog->nparens)
536 # define RX_NPARENS(rx_sv) (RXp_NPARENS(ReANY(rx_sv)))
537 # define RX_SUBLEN(rx_sv) (ReANY(rx_sv)->sublen)
538 # define RXp_MINLEN(prog) (prog->minlen)
539 # define RX_MINLEN(rx_sv) (RXp_MINLEN(ReANY(rx_sv)))
540 # define RXp_MINLENRET(prog) (prog->minlenret)
541 # define RX_MINLENRET(rx_sv) (RXp_MINLENRET(ReANY(rx_sv)))
542 # define RXp_GOFS(prog) (prog->gofs)
543 # define RX_GOFS(rx_sv) (RXp_GOFS(ReANY(rx_sv)))
544 # define RX_LASTPAREN(rx_sv) (ReANY(rx_sv)->lastparen)
545 # define RX_LASTCLOSEPAREN(rx_sv) (ReANY(rx_sv)->lastcloseparen)
546 # define RXp_SAVED_COPY(prog) (prog->saved_copy)
547 # define RX_SAVED_COPY(rx_sv) (RXp_SAVED_COPY(ReANY(rx_sv)))
548 /* last match was zero-length */
549 # define RXp_ZERO_LEN(prog) \
550 (RXp_OFFS(prog)[0].start + (SSize_t)RXp_GOFS(prog) \
551 == RXp_OFFS(prog)[0].end)
552 # define RX_ZERO_LEN(rx_sv) (RXp_ZERO_LEN(ReANY(rx_sv)))
554 #endif /* PLUGGABLE_RE_EXTENSION */
556 /* Stuff that needs to be included in the pluggable extension goes below here */
559 # define RXp_MATCH_COPY_FREE(prog) \
560 STMT_START {if (RXp_SAVED_COPY(prog)) { \
561 SV_CHECK_THINKFIRST_COW_DROP(RXp_SAVED_COPY(prog)); \
563 if (RXp_MATCH_COPIED(prog)) { \
564 Safefree(RXp_SUBBEG(prog)); \
565 RXp_MATCH_COPIED_off(prog); \
568 # define RXp_MATCH_COPY_FREE(prog) \
569 STMT_START {if (RXp_MATCH_COPIED(prog)) { \
570 Safefree(RXp_SUBBEG(prog)); \
571 RXp_MATCH_COPIED_off(prog); \
574 #define RX_MATCH_COPY_FREE(rx_sv) RXp_MATCH_COPY_FREE(ReANY(rx_sv))
576 #define RXp_MATCH_UTF8(prog) (RXp_EXTFLAGS(prog) & RXf_MATCH_UTF8)
577 #define RX_MATCH_UTF8(rx_sv) (RX_EXTFLAGS(rx_sv) & RXf_MATCH_UTF8)
578 #define RXp_MATCH_UTF8_on(prog) (RXp_EXTFLAGS(prog) |= RXf_MATCH_UTF8)
579 #define RX_MATCH_UTF8_on(rx_sv) (RXp_MATCH_UTF8_on(ReANY(rx_sv)))
580 #define RXp_MATCH_UTF8_off(prog) (RXp_EXTFLAGS(prog) &= ~RXf_MATCH_UTF8)
581 #define RX_MATCH_UTF8_off(rx_sv) (RXp_MATCH_UTF8_off(ReANY(rx_sv))
582 #define RXp_MATCH_UTF8_set(prog, t) ((t) \
583 ? RXp_MATCH_UTF8_on(prog) \
584 : RXp_MATCH_UTF8_off(prog))
585 #define RX_MATCH_UTF8_set(rx_sv, t) (RXp_MATCH_UTF8_set(ReANY(rx_sv), t))
587 /* Whether the pattern stored at RX_WRAPPED is in UTF-8 */
588 #define RX_UTF8(rx_sv) SvUTF8(rx_sv)
591 /* bits in flags arg of Perl_regexec_flags() */
593 #define REXEC_COPY_STR 0x01 /* Need to copy the string for captures. */
594 #define REXEC_CHECKED 0x02 /* re_intuit_start() already called. */
595 #define REXEC_SCREAM 0x04 /* currently unused. */
596 #define REXEC_IGNOREPOS 0x08 /* use stringarg, not pos(), for \G match */
597 #define REXEC_NOT_FIRST 0x10 /* This is another iteration of //g:
598 no need to copy string again */
600 /* under REXEC_COPY_STR, it's ok for the
601 engine (modulo PL_sawamperand etc)
602 to skip copying: ... */
603 #define REXEC_COPY_SKIP_PRE 0x20 /* ...the $` part of the string, or */
604 #define REXEC_COPY_SKIP_POST 0x40 /* ...the $' part of the string */
605 #define REXEC_FAIL_ON_UNDERFLOW 0x80 /* fail the match if $& would start before
606 the start pos (so s/.\G// would fail
607 on second iteration */
609 #if defined(PERL_USE_GCC_BRACE_GROUPS)
610 # define ReREFCNT_inc(re) \
612 /* This is here to generate a casting warning if incorrect. */ \
613 REGEXP *const _rerefcnt_inc = (re); \
614 assert(SvTYPE(_rerefcnt_inc) == SVt_REGEXP); \
615 SvREFCNT_inc(_rerefcnt_inc); \
618 # define ReREFCNT_dec(re) \
620 /* This is here to generate a casting warning if incorrect. */ \
621 REGEXP *const _rerefcnt_dec = (re); \
622 SvREFCNT_dec(_rerefcnt_dec); \
625 # define ReREFCNT_dec(re) SvREFCNT_dec(re)
626 # define ReREFCNT_inc(re) ((REGEXP *) SvREFCNT_inc(re))
628 #define ReANY(re) Perl_ReANY((const REGEXP *)(re))
630 /* FIXME for plugins. */
632 #define FBMcf_TAIL_DOLLAR 1
633 #define FBMcf_TAIL_DOLLARM 2
634 #define FBMcf_TAIL_Z 4
635 #define FBMcf_TAIL_z 8
636 #define FBMcf_TAIL (FBMcf_TAIL_DOLLAR|FBMcf_TAIL_DOLLARM|FBMcf_TAIL_Z|FBMcf_TAIL_z)
638 #define FBMrf_MULTILINE 1
640 struct regmatch_state;
641 struct regmatch_slab;
643 /* like regmatch_info_aux, but contains extra fields only needed if the
644 * pattern contains (?{}). If used, is snuck into the second slot in the
645 * regmatch_state stack at the start of execution */
649 PMOP *curpm; /* saved PL_curpm */
651 SV *saved_copy; /* saved saved_copy field from rex */
653 char *subbeg; /* saved subbeg field from rex */
654 STRLEN sublen; /* saved sublen field from rex */
655 STRLEN suboffset; /* saved suboffset field from rex */
656 STRLEN subcoffset; /* saved subcoffset field from rex */
657 SV *sv; /* $_ during (?{}) */
658 MAGIC *pos_magic; /* pos() magic attached to $_ */
659 SSize_t pos; /* the original value of pos() in pos_magic */
660 U8 pos_flags; /* flags to be restored; currently only MGf_BYTES*/
661 } regmatch_info_aux_eval;
664 /* fields that logically live in regmatch_info, but which need cleaning
665 * up on croak(), and so are instead are snuck into the first slot in
666 * the regmatch_state stack at the start of execution */
669 regmatch_info_aux_eval *info_aux_eval;
670 struct regmatch_state *old_regmatch_state; /* saved PL_regmatch_state */
671 struct regmatch_slab *old_regmatch_slab; /* saved PL_regmatch_slab */
672 char *poscache; /* S-L cache of fail positions of WHILEMs */
676 /* some basic information about the current match that is created by
677 * Perl_regexec_flags and then passed to regtry(), regmatch() etc.
678 * It is allocated as a local var on the stack, so nothing should be
679 * stored in it that needs preserving or clearing up on croak().
680 * For that, see the aux_info and aux_info_eval members of the
681 * regmatch_state union. */
684 REGEXP *prog; /* the regex being executed */
685 const char * strbeg; /* real start of string */
686 char *strend; /* one byte beyond last char of match string */
687 char *till; /* matches shorter than this fail (see minlen arg) */
688 SV *sv; /* the SV string currently being matched */
689 char *ganch; /* position of \G anchor */
690 char *cutpoint; /* (*COMMIT) position (if any) */
691 regmatch_info_aux *info_aux; /* extra fields that need cleanup */
692 regmatch_info_aux_eval *info_aux_eval; /* extra saved state for (?{}) */
693 I32 poscache_maxiter; /* how many whilems todo before S-L cache kicks in */
694 I32 poscache_iter; /* current countdown from _maxiter to zero */
695 STRLEN poscache_size; /* size of regmatch_info_aux.poscache */
696 bool intuit; /* re_intuit_start() is the top-level caller */
697 bool is_utf8_pat; /* regex is utf8 */
698 bool is_utf8_target; /* string being matched is utf8 */
699 bool warned; /* we have issued a recursion warning; no need for more */
703 /* structures for holding and saving the state maintained by regmatch() */
705 #ifndef MAX_RECURSE_EVAL_NOCHANGE_DEPTH
706 # define MAX_RECURSE_EVAL_NOCHANGE_DEPTH 10
709 /* The +3 is based on the current Unicode standards needs, and is unlikely to
710 * change. An assertion should fail in regexec.c if it is too low. It is
711 * needed for certain edge cases involving multi-character folds when the first
712 * component also participates in a fold individually. */
713 #define MAX_MATCHES (MAX_FOLD_FROMS + 3)
715 struct next_matchable_info {
720 PERL_INT_FAST8_T count; /* Negative means not initialized */
721 PERL_UINT_FAST8_T min_length;
722 PERL_UINT_FAST8_T max_length;
723 PERL_UINT_FAST8_T initial_definitive;
724 PERL_UINT_FAST8_T initial_exact;
725 PERL_UINT_FAST8_T lengths[MAX_MATCHES];
727 /* The size is from trial and error, and could change with new Unicode
728 * standards, in which case there is an assertion that should start
729 * failing. This size could be calculated in one of the regen scripts
730 * dealing with Unicode, but khw thinks the likelihood of it changing is
731 * low enough that it isn't worth the effort. */
735 typedef I32 CHECKPOINT;
737 typedef struct regmatch_state {
738 int resume_state; /* where to jump to on return */
739 char *locinput; /* where to backtrack in string on failure */
741 U8 *sr0; /* position of start of script run, or NULL */
745 /* the 'info_aux' and 'info_aux_eval' union members are cuckoos in
746 * the nest. They aren't saved backtrack state; rather they
747 * represent one or two extra chunks of data that need allocating
748 * at the start of a match. These fields would logically live in
749 * the regmatch_info struct, except that is allocated on the
750 * C stack, and these fields are all things that require cleanup
751 * after a croak(), when the stack is lost.
752 * As a convenience, we just use the first 1 or 2 regmatch_state
753 * slots to store this info, as we will be allocating a slab of
754 * these anyway. Otherwise we'd have to malloc and then free them,
755 * or allocate them on the save stack (where they will get
756 * realloced if the save stack grows).
757 * info_aux contains the extra fields that are always needed;
758 * info_aux_eval contains extra fields that only needed if
759 * the pattern contains code blocks
760 * We split them into two separate structs to avoid increasing
761 * the size of the union.
764 regmatch_info_aux info_aux;
766 regmatch_info_aux_eval info_aux_eval;
768 /* this is a fake union member that matches the first element
769 * of each member that needs to store positive backtrack
772 struct regmatch_state *prev_yes_state;
775 /* branchlike members */
776 /* this is a fake union member that matches the first elements
777 * of each member that needs to behave like a branch */
779 /* this first element must match u.yes */
780 struct regmatch_state *prev_yes_state;
788 /* the first elements must match u.branchlike */
789 struct regmatch_state *prev_yes_state;
794 regnode *next_branch; /* next branch node */
798 /* the first elements must match u.branchlike */
799 struct regmatch_state *prev_yes_state;
804 U32 accepted; /* how many accepting states left */
805 bool longfold;/* saw a fold with a 1->n char mapping */
806 U16 *jump; /* positive offsets from me */
807 regnode *me; /* Which node am I - needed for jump tries*/
808 U8 *firstpos;/* pos in string of first trie match */
809 U32 firstchars;/* len in chars of firstpos from start */
810 U16 nextword;/* next word to try */
811 U16 topword; /* longest accepted word */
814 /* special types - these members are used to store state for special
815 regops like eval, if/then, lookaround and the markpoint state */
817 /* this first element must match u.yes */
818 struct regmatch_state *prev_yes_state;
819 struct regmatch_state *prev_curlyx;
820 struct regmatch_state *prev_eval;
822 CHECKPOINT cp; /* remember current savestack indexes */
824 U32 close_paren; /* which close bracket is our end (+1) */
825 regnode *B; /* the node following us */
826 char *prev_recurse_locinput;
830 /* this first element must match u.yes */
831 struct regmatch_state *prev_yes_state;
833 I32 logical; /* saved copy of 'logical' var */
834 U8 count; /* number of beginning positions */
837 regnode *me; /* the IFMATCH/SUSPEND/UNLESSM node */
838 } ifmatch; /* and SUSPEND/UNLESSM */
841 /* this first element must match u.yes */
842 struct regmatch_state *prev_yes_state;
843 struct regmatch_state *prev_mark;
852 /* quantifiers - these members are used for storing state for
853 the regops used to implement quantifiers */
855 /* this first element must match u.yes */
856 struct regmatch_state *prev_yes_state;
857 struct regmatch_state *prev_curlyx; /* previous cur_curlyx */
858 regnode *me; /* the CURLYX node */
859 regnode *B; /* the B node in /A*B/ */
860 CHECKPOINT cp; /* remember current savestack index */
862 int parenfloor;/* how far back to strip paren data */
864 /* these two are modified by WHILEM */
865 int count; /* how many instances of A we've matched */
866 char *lastloc;/* where previous A matched (0-len detect) */
870 /* this first element must match u.yes */
871 struct regmatch_state *prev_yes_state;
872 struct regmatch_state *save_curlyx;
873 CHECKPOINT cp; /* remember current savestack indexes */
875 char *save_lastloc; /* previous curlyx.lastloc */
881 /* this first element must match u.yes */
882 struct regmatch_state *prev_yes_state;
886 I32 alen; /* length of first-matched A string */
889 regnode *A, *B; /* the nodes corresponding to /A*B/ */
890 regnode *me; /* the curlym node */
891 struct next_matchable_info Binfo;
899 char *maxpos; /* highest possible point in string to match */
900 char *oldloc; /* the previous locinput */
902 int min, max; /* {m,n} */
903 regnode *A, *B; /* the nodes corresponding to /A*B/ */
904 struct next_matchable_info Binfo;
905 } curly; /* and CURLYN/PLUS/STAR */
912 /* how many regmatch_state structs to allocate as a single slab.
913 * We do it in 4K blocks for efficiency. The "3" is 2 for the next/prev
914 * pointers, plus 1 for any mythical malloc overhead. */
916 #define PERL_REGMATCH_SLAB_SLOTS \
917 ((4096 - 3 * sizeof (void*)) / sizeof(regmatch_state))
919 typedef struct regmatch_slab {
920 regmatch_state states[PERL_REGMATCH_SLAB_SLOTS];
921 struct regmatch_slab *prev, *next;
927 * ex: set ts=8 sts=4 sw=4 et: