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'*/
29 typedef struct regnode regnode;
31 struct reg_substr_data;
38 struct reg_substr_datum {
39 SSize_t min_offset; /* min pos (in chars) that substr must appear */
40 SSize_t max_offset /* max pos (in chars) that substr must appear */;
41 SV *substr; /* non-utf8 variant */
42 SV *utf8_substr; /* utf8 variant */
43 SSize_t end_shift; /* how many fixed chars must end the string */
45 struct reg_substr_data {
46 U8 check_ix; /* index into data[] of check substr */
47 struct reg_substr_datum data[3]; /* Actual array */
51 #define SV_SAVED_COPY SV *saved_copy; /* If non-NULL, SV which is COW from original */
56 /* offsets within a string of a particular /(.)/ capture */
58 typedef struct regexp_paren_pair {
61 /* 'start_tmp' records a new opening position before the matching end
62 * has been found, so that the old start and end values are still
64 * "abc" =~ /(.(?{print "[$1]"}))+/
66 * This field is not part of the API. */
70 #if defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_UTF8_C)
71 #define _invlist_union(a, b, output) _invlist_union_maybe_complement_2nd(a, b, FALSE, output)
72 #define _invlist_intersection(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, FALSE, output)
74 /* Subtracting b from a leaves in a everything that was there that isn't in b,
75 * that is the intersection of a with b's complement */
76 #define _invlist_subtract(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, TRUE, output)
79 /* record the position of a (?{...}) within a pattern */
81 struct reg_code_block {
90 The regexp/REGEXP struct, see L<perlreapi> for further documentation
91 on the individual fields. The struct is ordered so that the most
92 commonly used fields are placed at the start.
94 Any patch that adds items to this struct will need to include
95 changes to F<sv.c> (C<Perl_re_dup()>) and F<regcomp.c>
96 (C<pregfree()>). This involves freeing or cloning items in the
97 regexp's data array based on the data item's type.
100 #define _REGEXP_COMMON \
101 /* what engine created this regexp? */ \
102 const struct regexp_engine* engine; \
103 REGEXP *mother_re; /* what re is this a lightweight copy of? */ \
104 HV *paren_names; /* Optional hash of paren names */ \
105 /* Information about the match that the perl core uses to */ \
106 /* manage things */ \
107 U32 extflags; /* Flags used both externally and internally */ \
108 SSize_t minlen; /* mininum possible number of chars in string to match */\
109 SSize_t minlenret; /* mininum possible number of chars in $& */ \
110 STRLEN gofs; /* chars left of pos that we search from */ \
111 /* substring data about strings that must appear in the */ \
112 /* final match, used for optimisations */ \
113 struct reg_substr_data *substrs; \
114 U32 nparens; /* number of capture buffers */ \
115 /* private engine specific data */ \
116 U32 intflags; /* Engine Specific Internal flags */ \
117 void *pprivate; /* Data private to the regex engine which */ \
118 /* created this object. */ \
119 /* Data about the last/current match. These are modified */ \
120 /* during matching */ \
121 U32 lastparen; /* last open paren matched */ \
122 U32 lastcloseparen; /* last close paren matched */ \
123 /* Array of offsets for (@-) and (@+) */ \
124 regexp_paren_pair *offs; \
125 /* saved or original string so \digit works forever. */ \
127 SV_SAVED_COPY /* If non-NULL, SV which is COW from original */\
128 SSize_t sublen; /* Length of string pointed by subbeg */ \
129 SSize_t suboffset; /* byte offset of subbeg from logical start of str */ \
130 SSize_t subcoffset; /* suboffset equiv, but in chars (for @-/@+) */ \
131 /* Information about the match that isn't often used */ \
132 SSize_t maxlen; /* mininum possible number of chars in string to match */\
133 /* offset from wrapped to the start of precomp */ \
134 PERL_BITFIELD32 pre_prefix:4; \
135 /* original flags used to compile the pattern, may differ */ \
136 /* from extflags in various ways */ \
137 PERL_BITFIELD32 compflags:9; \
138 CV *qr_anoncv /* the anon sub wrapped round qr/(?{..})/ */
140 typedef struct regexp {
145 #define RXp_PAREN_NAMES(rx) ((rx)->paren_names)
147 /* used for high speed searches */
148 typedef struct re_scream_pos_data_s
150 char **scream_olds; /* match pos */
151 SSize_t *scream_pos; /* Internal iterator of scream. */
152 } re_scream_pos_data;
154 /* regexp_engine structure. This is the dispatch table for regexes.
155 * Any regex engine implementation must be able to build one of these.
157 typedef struct regexp_engine {
158 REGEXP* (*comp) (pTHX_ SV * const pattern, U32 flags);
159 I32 (*exec) (pTHX_ REGEXP * const rx, char* stringarg, char* strend,
160 char* strbeg, SSize_t minend, SV* sv,
161 void* data, U32 flags);
162 char* (*intuit) (pTHX_
165 const char * const strbeg,
169 re_scream_pos_data *data);
170 SV* (*checkstr) (pTHX_ REGEXP * const rx);
171 void (*free) (pTHX_ REGEXP * const rx);
172 void (*numbered_buff_FETCH) (pTHX_ REGEXP * const rx, const I32 paren,
174 void (*numbered_buff_STORE) (pTHX_ REGEXP * const rx, const I32 paren,
175 SV const * const value);
176 I32 (*numbered_buff_LENGTH) (pTHX_ REGEXP * const rx, const SV * const sv,
178 SV* (*named_buff) (pTHX_ REGEXP * const rx, SV * const key,
179 SV * const value, const U32 flags);
180 SV* (*named_buff_iter) (pTHX_ REGEXP * const rx, const SV * const lastkey,
182 SV* (*qr_package)(pTHX_ REGEXP * const rx);
184 void* (*dupe) (pTHX_ REGEXP * const rx, CLONE_PARAMS *param);
186 REGEXP* (*op_comp) (pTHX_ SV ** const patternp, int pat_count,
187 OP *expr, const struct regexp_engine* eng,
189 bool *is_bare_re, U32 orig_rx_flags, U32 pm_flags);
193 These are passed to the numbered capture variable callbacks as the
194 paren name. >= 1 is reserved for actual numbered captures, i.e. $1,
197 #define RX_BUFF_IDX_CARET_PREMATCH -5 /* ${^PREMATCH} */
198 #define RX_BUFF_IDX_CARET_POSTMATCH -4 /* ${^POSTMATCH} */
199 #define RX_BUFF_IDX_CARET_FULLMATCH -3 /* ${^MATCH} */
200 #define RX_BUFF_IDX_PREMATCH -2 /* $` */
201 #define RX_BUFF_IDX_POSTMATCH -1 /* $' */
202 #define RX_BUFF_IDX_FULLMATCH 0 /* $& */
205 Flags that are passed to the named_buff and named_buff_iter
206 callbacks above. Those routines are called from universal.c via the
207 Tie::Hash::NamedCapture interface for %+ and %- and the re::
208 functions in the same file.
211 /* The Tie::Hash::NamedCapture operation this is part of, if any */
212 #define RXapif_FETCH 0x0001
213 #define RXapif_STORE 0x0002
214 #define RXapif_DELETE 0x0004
215 #define RXapif_CLEAR 0x0008
216 #define RXapif_EXISTS 0x0010
217 #define RXapif_SCALAR 0x0020
218 #define RXapif_FIRSTKEY 0x0040
219 #define RXapif_NEXTKEY 0x0080
221 /* Whether %+ or %- is being operated on */
222 #define RXapif_ONE 0x0100 /* %+ */
223 #define RXapif_ALL 0x0200 /* %- */
225 /* Whether this is being called from a re:: function */
226 #define RXapif_REGNAME 0x0400
227 #define RXapif_REGNAMES 0x0800
228 #define RXapif_REGNAMES_COUNT 0x1000
231 =head1 REGEXP Functions
233 =for apidoc Am|REGEXP *|SvRX|SV *sv
235 Convenience macro to get the REGEXP from a SV. This is approximately
236 equivalent to the following snippet:
241 sv = MUTABLE_SV(SvRV(sv));
242 if (SvTYPE(sv) == SVt_REGEXP)
245 NULL will be returned if a REGEXP* is not found.
247 =for apidoc Am|bool|SvRXOK|SV* sv
249 Returns a boolean indicating whether the SV (or the one it references)
252 If you want to do something with the REGEXP* later use SvRX instead
258 #define SvRX(sv) (Perl_get_re_arg(aTHX_ sv))
259 #define SvRXOK(sv) (Perl_get_re_arg(aTHX_ sv) ? TRUE : FALSE)
262 /* Flags stored in regexp->extflags
263 * These are used by code external to the regexp engine
265 * Note that the flags whose names start with RXf_PMf_ are defined in
266 * op_reg_common.h, being copied from the parallel flags of op_pmflags
268 * NOTE: if you modify any RXf flags you should run regen.pl or
269 * regen/regcomp.pl so that regnodes.h is updated with the changes.
273 #include "op_reg_common.h"
275 #define RXf_PMf_STD_PMMOD (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_FOLD|RXf_PMf_EXTENDED)
277 #define CASE_STD_PMMOD_FLAGS_PARSE_SET(pmfl) \
278 case IGNORE_PAT_MOD: *(pmfl) |= RXf_PMf_FOLD; break; \
279 case MULTILINE_PAT_MOD: *(pmfl) |= RXf_PMf_MULTILINE; break; \
280 case SINGLE_PAT_MOD: *(pmfl) |= RXf_PMf_SINGLELINE; break; \
281 case XTENDED_PAT_MOD: *(pmfl) |= RXf_PMf_EXTENDED; break
283 /* Note, includes charset ones, assumes 0 is the default for them */
284 #define STD_PMMOD_FLAGS_CLEAR(pmfl) \
285 *(pmfl) &= ~(RXf_PMf_FOLD|RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_EXTENDED|RXf_PMf_CHARSET)
287 /* chars and strings used as regex pattern modifiers
288 * Singular is a 'c'har, plural is a "string"
290 * NOTE, KEEPCOPY was originally 'k', but was changed to 'p' for preserve
291 * for compatibility reasons with Regexp::Common which highjacked (?k:...)
292 * for its own uses. So 'k' is out as well.
294 #define DEFAULT_PAT_MOD '^' /* Short for all the default modifiers */
295 #define EXEC_PAT_MOD 'e'
296 #define KEEPCOPY_PAT_MOD 'p'
297 #define ONCE_PAT_MOD 'o'
298 #define GLOBAL_PAT_MOD 'g'
299 #define CONTINUE_PAT_MOD 'c'
300 #define MULTILINE_PAT_MOD 'm'
301 #define SINGLE_PAT_MOD 's'
302 #define IGNORE_PAT_MOD 'i'
303 #define XTENDED_PAT_MOD 'x'
304 #define NONDESTRUCT_PAT_MOD 'r'
305 #define LOCALE_PAT_MOD 'l'
306 #define UNICODE_PAT_MOD 'u'
307 #define DEPENDS_PAT_MOD 'd'
308 #define ASCII_RESTRICT_PAT_MOD 'a'
310 #define ONCE_PAT_MODS "o"
311 #define KEEPCOPY_PAT_MODS "p"
312 #define EXEC_PAT_MODS "e"
313 #define LOOP_PAT_MODS "gc"
314 #define NONDESTRUCT_PAT_MODS "r"
315 #define LOCALE_PAT_MODS "l"
316 #define UNICODE_PAT_MODS "u"
317 #define DEPENDS_PAT_MODS "d"
318 #define ASCII_RESTRICT_PAT_MODS "a"
319 #define ASCII_MORE_RESTRICT_PAT_MODS "aa"
321 /* This string is expected by regcomp.c to be ordered so that the first
322 * character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of extflags; the next
323 * character is bit +1, etc. */
324 #define STD_PAT_MODS "msix"
326 #define CHARSET_PAT_MODS ASCII_RESTRICT_PAT_MODS DEPENDS_PAT_MODS LOCALE_PAT_MODS UNICODE_PAT_MODS
328 /* This string is expected by XS_re_regexp_pattern() in universal.c to be ordered
329 * so that the first character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of
330 * extflags; the next character is in bit +1, etc. */
331 #define INT_PAT_MODS STD_PAT_MODS KEEPCOPY_PAT_MODS
333 #define EXT_PAT_MODS ONCE_PAT_MODS KEEPCOPY_PAT_MODS
334 #define QR_PAT_MODS STD_PAT_MODS EXT_PAT_MODS CHARSET_PAT_MODS
335 #define M_PAT_MODS QR_PAT_MODS LOOP_PAT_MODS
336 #define S_PAT_MODS M_PAT_MODS EXEC_PAT_MODS NONDESTRUCT_PAT_MODS
339 * NOTE: if you modify any RXf flags you should run regen.pl or
340 * regen/regcomp.pl so that regnodes.h is updated with the changes.
344 /* Leave some space, so future bit allocations can go either in the shared or
345 * unshared area without affecting binary compatibility */
346 #define RXf_BASE_SHIFT (_RXf_PMf_SHIFT_NEXT)
349 Set in Perl_pmruntime if op_flags & OPf_SPECIAL, i.e. split. Will
350 be used by regex engines to check whether they should set
353 #define RXf_SPLIT (1<<(RXf_BASE_SHIFT-1))
354 #if RXf_SPLIT != RXf_PMf_SPLIT
355 # error "RXf_SPLIT does not match RXf_PMf_SPLIT"
358 /* Do we have some sort of anchor? */
359 #define RXf_IS_ANCHORED (1<<(RXf_BASE_SHIFT+0))
360 #define RXf_UNUSED1 (1<<(RXf_BASE_SHIFT+1))
361 #define RXf_UNUSED2 (1<<(RXf_BASE_SHIFT+2))
362 #define RXf_UNUSED3 (1<<(RXf_BASE_SHIFT+3))
363 #define RXf_UNUSED4 (1<<(RXf_BASE_SHIFT+4))
364 #define RXf_UNUSED5 (1<<(RXf_BASE_SHIFT+5))
366 /* What we have seen */
367 #define RXf_NO_INPLACE_SUBST (1<<(RXf_BASE_SHIFT+6))
368 #define RXf_EVAL_SEEN (1<<(RXf_BASE_SHIFT+7))
369 #define RXf_UNUSED8 (1<<(RXf_BASE_SHIFT+8))
372 #define RXf_UNBOUNDED_QUANTIFIER_SEEN (1<<(RXf_BASE_SHIFT+9))
373 #define RXf_CHECK_ALL (1<<(RXf_BASE_SHIFT+10))
376 #define RXf_MATCH_UTF8 (1<<(RXf_BASE_SHIFT+11)) /* $1 etc are utf8 */
379 #define RXf_USE_INTUIT_NOML (1<<(RXf_BASE_SHIFT+12))
380 #define RXf_USE_INTUIT_ML (1<<(RXf_BASE_SHIFT+13))
381 #define RXf_INTUIT_TAIL (1<<(RXf_BASE_SHIFT+14))
382 #define RXf_USE_INTUIT (RXf_USE_INTUIT_NOML|RXf_USE_INTUIT_ML)
384 /* Copy and tainted info */
385 #define RXf_COPY_DONE (1<<(RXf_BASE_SHIFT+16))
387 /* post-execution: $1 et al are tainted */
388 #define RXf_TAINTED_SEEN (1<<(RXf_BASE_SHIFT+17))
389 /* this pattern was tainted during compilation */
390 #define RXf_TAINTED (1<<(RXf_BASE_SHIFT+18))
392 /* Flags indicating special patterns */
393 #define RXf_START_ONLY (1<<(RXf_BASE_SHIFT+19)) /* Pattern is /^/ */
394 #define RXf_SKIPWHITE (1<<(RXf_BASE_SHIFT+20)) /* Pattern is for a split " " */
395 #define RXf_WHITE (1<<(RXf_BASE_SHIFT+21)) /* Pattern is /\s+/ */
396 #define RXf_NULL (1U<<(RXf_BASE_SHIFT+22)) /* Pattern is // */
397 #if RXf_BASE_SHIFT+22 > 31
398 # error Too many RXf_PMf bits used. See regnodes.h for any spare in middle
402 * NOTE: if you modify any RXf flags you should run regen.pl or
403 * regen/regcomp.pl so that regnodes.h is updated with the changes.
407 #ifdef NO_TAINT_SUPPORT
408 # define RX_ISTAINTED(prog) 0
409 # define RX_TAINT_on(prog) NOOP
410 # define RXp_MATCH_TAINTED(prog) 0
411 # define RX_MATCH_TAINTED(prog) 0
412 # define RXp_MATCH_TAINTED_on(prog) NOOP
413 # define RX_MATCH_TAINTED_on(prog) NOOP
414 # define RX_MATCH_TAINTED_off(prog) NOOP
416 # define RX_ISTAINTED(prog) (RX_EXTFLAGS(prog) & RXf_TAINTED)
417 # define RX_TAINT_on(prog) (RX_EXTFLAGS(prog) |= RXf_TAINTED)
418 # define RXp_MATCH_TAINTED(prog) (RXp_EXTFLAGS(prog) & RXf_TAINTED_SEEN)
419 # define RX_MATCH_TAINTED(prog) (RX_EXTFLAGS(prog) & RXf_TAINTED_SEEN)
420 # define RXp_MATCH_TAINTED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_TAINTED_SEEN)
421 # define RX_MATCH_TAINTED_on(prog) (RX_EXTFLAGS(prog) |= RXf_TAINTED_SEEN)
422 # define RX_MATCH_TAINTED_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_TAINTED_SEEN)
425 #define RX_HAS_CUTGROUP(prog) ((prog)->intflags & PREGf_CUTGROUP_SEEN)
426 #define RX_MATCH_TAINTED_set(prog, t) ((t) \
427 ? RX_MATCH_TAINTED_on(prog) \
428 : RX_MATCH_TAINTED_off(prog))
430 #define RXp_MATCH_COPIED(prog) (RXp_EXTFLAGS(prog) & RXf_COPY_DONE)
431 #define RX_MATCH_COPIED(prog) (RX_EXTFLAGS(prog) & RXf_COPY_DONE)
432 #define RXp_MATCH_COPIED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_COPY_DONE)
433 #define RX_MATCH_COPIED_on(prog) (RX_EXTFLAGS(prog) |= RXf_COPY_DONE)
434 #define RXp_MATCH_COPIED_off(prog) (RXp_EXTFLAGS(prog) &= ~RXf_COPY_DONE)
435 #define RX_MATCH_COPIED_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_COPY_DONE)
436 #define RX_MATCH_COPIED_set(prog,t) ((t) \
437 ? RX_MATCH_COPIED_on(prog) \
438 : RX_MATCH_COPIED_off(prog))
440 #define RXp_EXTFLAGS(rx) ((rx)->extflags)
441 #define RXp_COMPFLAGS(rx) ((rx)->compflags)
443 /* For source compatibility. We used to store these explicitly. */
444 #define RX_PRECOMP(prog) (RX_WRAPPED(prog) + ReANY(prog)->pre_prefix)
445 #define RX_PRECOMP_const(prog) (RX_WRAPPED_const(prog) + ReANY(prog)->pre_prefix)
446 /* FIXME? Are we hardcoding too much here and constraining plugin extension
447 writers? Specifically, the value 1 assumes that the wrapped version always
448 has exactly one character at the end, a ')'. Will that always be true? */
449 #define RX_PRELEN(prog) (RX_WRAPLEN(prog) - ReANY(prog)->pre_prefix - 1)
450 #define RX_WRAPPED(prog) ReANY(prog)->xpv_len_u.xpvlenu_pv
451 #define RX_WRAPPED_const(prog) ((const char *)RX_WRAPPED(prog))
452 #define RX_WRAPLEN(prog) SvCUR(prog)
453 #define RX_CHECK_SUBSTR(prog) (ReANY(prog)->check_substr)
454 #define RX_REFCNT(prog) SvREFCNT(prog)
455 #define RX_EXTFLAGS(prog) RXp_EXTFLAGS(ReANY(prog))
456 #define RX_COMPFLAGS(prog) RXp_COMPFLAGS(ReANY(prog))
457 #define RX_ENGINE(prog) (ReANY(prog)->engine)
458 #define RX_SUBBEG(prog) (ReANY(prog)->subbeg)
459 #define RX_SUBOFFSET(prog) (ReANY(prog)->suboffset)
460 #define RX_SUBCOFFSET(prog) (ReANY(prog)->subcoffset)
461 #define RX_OFFS(prog) (ReANY(prog)->offs)
462 #define RX_NPARENS(prog) (ReANY(prog)->nparens)
463 #define RX_SUBLEN(prog) (ReANY(prog)->sublen)
464 #define RX_MINLEN(prog) (ReANY(prog)->minlen)
465 #define RX_MINLENRET(prog) (ReANY(prog)->minlenret)
466 #define RX_GOFS(prog) (ReANY(prog)->gofs)
467 #define RX_LASTPAREN(prog) (ReANY(prog)->lastparen)
468 #define RX_LASTCLOSEPAREN(prog) (ReANY(prog)->lastcloseparen)
469 #define RX_SAVED_COPY(prog) (ReANY(prog)->saved_copy)
470 /* last match was zero-length */
471 #define RX_ZERO_LEN(prog) \
472 (RX_OFFS(prog)[0].start + (SSize_t)RX_GOFS(prog) \
473 == RX_OFFS(prog)[0].end)
475 #endif /* PLUGGABLE_RE_EXTENSION */
477 /* Stuff that needs to be included in the pluggable extension goes below here */
480 #define RX_MATCH_COPY_FREE(rx) \
481 STMT_START {if (RX_SAVED_COPY(rx)) { \
482 SV_CHECK_THINKFIRST_COW_DROP(RX_SAVED_COPY(rx)); \
484 if (RX_MATCH_COPIED(rx)) { \
485 Safefree(RX_SUBBEG(rx)); \
486 RX_MATCH_COPIED_off(rx); \
489 #define RX_MATCH_COPY_FREE(rx) \
490 STMT_START {if (RX_MATCH_COPIED(rx)) { \
491 Safefree(RX_SUBBEG(rx)); \
492 RX_MATCH_COPIED_off(rx); \
496 #define RXp_MATCH_UTF8(prog) (RXp_EXTFLAGS(prog) & RXf_MATCH_UTF8)
497 #define RX_MATCH_UTF8(prog) (RX_EXTFLAGS(prog) & RXf_MATCH_UTF8)
498 #define RX_MATCH_UTF8_on(prog) (RX_EXTFLAGS(prog) |= RXf_MATCH_UTF8)
499 #define RX_MATCH_UTF8_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_MATCH_UTF8)
500 #define RX_MATCH_UTF8_set(prog, t) ((t) \
501 ? RX_MATCH_UTF8_on(prog) \
502 : RX_MATCH_UTF8_off(prog))
504 /* Whether the pattern stored at RX_WRAPPED is in UTF-8 */
505 #define RX_UTF8(prog) SvUTF8(prog)
508 /* bits in flags arg of Perl_regexec_flags() */
510 #define REXEC_COPY_STR 0x01 /* Need to copy the string for captures. */
511 #define REXEC_CHECKED 0x02 /* re_intuit_start() already called. */
512 #define REXEC_SCREAM 0x04 /* currently unused. */
513 #define REXEC_IGNOREPOS 0x08 /* use stringarg, not pos(), for \G match */
514 #define REXEC_NOT_FIRST 0x10 /* This is another iteration of //g:
515 no need to copy string again */
517 /* under REXEC_COPY_STR, it's ok for the
518 engine (modulo PL_sawamperand etc)
519 to skip copying: ... */
520 #define REXEC_COPY_SKIP_PRE 0x20 /* ...the $` part of the string, or */
521 #define REXEC_COPY_SKIP_POST 0x40 /* ...the $' part of the string */
522 #define REXEC_FAIL_ON_UNDERFLOW 0x80 /* fail the match if $& would start before
523 the start pos (so s/.\G// would fail
524 on second iteration */
526 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
527 # define ReREFCNT_inc(re) \
529 /* This is here to generate a casting warning if incorrect. */ \
530 REGEXP *const _rerefcnt_inc = (re); \
531 assert(SvTYPE(_rerefcnt_inc) == SVt_REGEXP); \
532 SvREFCNT_inc(_rerefcnt_inc); \
535 # define ReREFCNT_dec(re) \
537 /* This is here to generate a casting warning if incorrect. */ \
538 REGEXP *const _rerefcnt_dec = (re); \
539 SvREFCNT_dec(_rerefcnt_dec); \
542 # define ReREFCNT_dec(re) SvREFCNT_dec(re)
543 # define ReREFCNT_inc(re) ((REGEXP *) SvREFCNT_inc(re))
545 #define ReANY(re) S_ReANY((const REGEXP *)(re))
547 /* FIXME for plugins. */
549 #define FBMcf_TAIL_DOLLAR 1
550 #define FBMcf_TAIL_DOLLARM 2
551 #define FBMcf_TAIL_Z 4
552 #define FBMcf_TAIL_z 8
553 #define FBMcf_TAIL (FBMcf_TAIL_DOLLAR|FBMcf_TAIL_DOLLARM|FBMcf_TAIL_Z|FBMcf_TAIL_z)
555 #define FBMrf_MULTILINE 1
557 struct regmatch_state;
558 struct regmatch_slab;
560 /* like regmatch_info_aux, but contains extra fields only needed if the
561 * pattern contains (?{}). If used, is snuck into the second slot in the
562 * regmatch_state stack at the start of execution */
566 PMOP *curpm; /* saved PL_curpm */
568 SV *saved_copy; /* saved saved_copy field from rex */
570 char *subbeg; /* saved subbeg field from rex */
571 STRLEN sublen; /* saved sublen field from rex */
572 STRLEN suboffset; /* saved suboffset field from rex */
573 STRLEN subcoffset; /* saved subcoffset field from rex */
574 MAGIC *pos_magic; /* pos() magic attached to $_ */
575 SSize_t pos; /* the original value of pos() in pos_magic */
576 U8 pos_flags; /* flags to be restored; currently only MGf_BYTES*/
577 } regmatch_info_aux_eval;
580 /* fields that logically live in regmatch_info, but which need cleaning
581 * up on croak(), and so are instead are snuck into the first slot in
582 * the regmatch_state stack at the start of execution */
585 regmatch_info_aux_eval *info_aux_eval;
586 struct regmatch_state *old_regmatch_state; /* saved PL_regmatch_state */
587 struct regmatch_slab *old_regmatch_slab; /* saved PL_regmatch_slab */
588 char *poscache; /* S-L cache of fail positions of WHILEMs */
592 /* some basic information about the current match that is created by
593 * Perl_regexec_flags and then passed to regtry(), regmatch() etc.
594 * It is allocated as a local var on the stack, so nothing should be
595 * stored in it that needs preserving or clearing up on croak().
596 * For that, see the aux_info and aux_info_eval members of the
597 * regmatch_state union. */
600 REGEXP *prog; /* the regex being executed */
601 const char * strbeg; /* real start of string */
602 char *strend; /* one byte beyond last char of match string */
603 char *till; /* matches shorter than this fail (see minlen arg) */
604 SV *sv; /* the SV string currently being matched */
605 char *ganch; /* position of \G anchor */
606 char *cutpoint; /* (*COMMIT) position (if any) */
607 regmatch_info_aux *info_aux; /* extra fields that need cleanup */
608 regmatch_info_aux_eval *info_aux_eval; /* extra saved state for (?{}) */
609 I32 poscache_maxiter; /* how many whilems todo before S-L cache kicks in */
610 I32 poscache_iter; /* current countdown from _maxiter to zero */
611 STRLEN poscache_size; /* size of regmatch_info_aux.poscache */
612 bool intuit; /* re_intuit_start() is the top-level caller */
613 bool is_utf8_pat; /* regex is utf8 */
614 bool is_utf8_target; /* string being matched is utf8 */
615 bool warned; /* we have issued a recursion warning; no need for more */
619 /* structures for holding and saving the state maintained by regmatch() */
621 #ifndef MAX_RECURSE_EVAL_NOCHANGE_DEPTH
622 #define MAX_RECURSE_EVAL_NOCHANGE_DEPTH 1000
625 typedef I32 CHECKPOINT;
627 typedef struct regmatch_state {
628 int resume_state; /* where to jump to on return */
629 char *locinput; /* where to backtrack in string on failure */
633 /* the 'info_aux' and 'info_aux_eval' union members are cuckoos in
634 * the nest. They aren't saved backtrack state; rather they
635 * represent one or two extra chunks of data that need allocating
636 * at the start of a match. These fields would logically live in
637 * the regmatch_info struct, except that is allocated on the
638 * C stack, and these fields are all things that require cleanup
639 * after a croak(), when the stack is lost.
640 * As a convenience, we just use the first 1 or 2 regmatch_state
641 * slots to store this info, as we will be allocating a slab of
642 * these anyway. Otherwise we'd have to malloc and then free them,
643 * or allocate them on the save stack (where they will get
644 * realloced if the save stack grows).
645 * info_aux contains the extra fields that are always needed;
646 * info_aux_eval contains extra fields that only needed if
647 * the pattern contains code blocks
648 * We split them into two separate structs to avoid increasing
649 * the size of the union.
652 regmatch_info_aux info_aux;
654 regmatch_info_aux_eval info_aux_eval;
656 /* this is a fake union member that matches the first element
657 * of each member that needs to store positive backtrack
660 struct regmatch_state *prev_yes_state;
663 /* branchlike members */
664 /* this is a fake union member that matches the first elements
665 * of each member that needs to behave like a branch */
667 /* this first element must match u.yes */
668 struct regmatch_state *prev_yes_state;
676 /* the first elements must match u.branchlike */
677 struct regmatch_state *prev_yes_state;
682 regnode *next_branch; /* next branch node */
686 /* the first elements must match u.branchlike */
687 struct regmatch_state *prev_yes_state;
692 U32 accepted; /* how many accepting states left */
693 bool longfold;/* saw a fold with a 1->n char mapping */
694 U16 *jump; /* positive offsets from me */
695 regnode *me; /* Which node am I - needed for jump tries*/
696 U8 *firstpos;/* pos in string of first trie match */
697 U32 firstchars;/* len in chars of firstpos from start */
698 U16 nextword;/* next word to try */
699 U16 topword; /* longest accepted word */
702 /* special types - these members are used to store state for special
703 regops like eval, if/then, lookaround and the markpoint state */
705 /* this first element must match u.yes */
706 struct regmatch_state *prev_yes_state;
707 struct regmatch_state *prev_eval;
708 struct regmatch_state *prev_curlyx;
710 CHECKPOINT cp; /* remember current savestack indexes */
712 U32 close_paren; /* which close bracket is our end */
713 regnode *B; /* the node following us */
717 /* this first element must match u.yes */
718 struct regmatch_state *prev_yes_state;
720 I32 logical; /* saved copy of 'logical' var */
721 regnode *me; /* the IFMATCH/SUSPEND/UNLESSM node */
722 } ifmatch; /* and SUSPEND/UNLESSM */
725 /* this first element must match u.yes */
726 struct regmatch_state *prev_yes_state;
727 struct regmatch_state *prev_mark;
736 /* quantifiers - these members are used for storing state for
737 for the regops used to implement quantifiers */
739 /* this first element must match u.yes */
740 struct regmatch_state *prev_yes_state;
741 struct regmatch_state *prev_curlyx; /* previous cur_curlyx */
742 regnode *me; /* the CURLYX node */
743 regnode *B; /* the B node in /A*B/ */
744 CHECKPOINT cp; /* remember current savestack index */
746 int parenfloor;/* how far back to strip paren data */
748 /* these two are modified by WHILEM */
749 int count; /* how many instances of A we've matched */
750 char *lastloc;/* where previous A matched (0-len detect) */
754 /* this first element must match u.yes */
755 struct regmatch_state *prev_yes_state;
756 struct regmatch_state *save_curlyx;
757 CHECKPOINT cp; /* remember current savestack indexes */
759 char *save_lastloc; /* previous curlyx.lastloc */
765 /* this first element must match u.yes */
766 struct regmatch_state *prev_yes_state;
767 int c1, c2; /* case fold search */
771 I32 alen; /* length of first-matched A string */
774 regnode *A, *B; /* the nodes corresponding to /A*B/ */
775 regnode *me; /* the curlym node */
776 U8 c1_utf8[UTF8_MAXBYTES+1]; /* */
777 U8 c2_utf8[UTF8_MAXBYTES+1];
785 int c1, c2; /* case fold search */
786 char *maxpos; /* highest possible point in string to match */
787 char *oldloc; /* the previous locinput */
789 int min, max; /* {m,n} */
790 regnode *A, *B; /* the nodes corresponding to /A*B/ */
791 U8 c1_utf8[UTF8_MAXBYTES+1]; /* */
792 U8 c2_utf8[UTF8_MAXBYTES+1];
793 } curly; /* and CURLYN/PLUS/STAR */
798 /* how many regmatch_state structs to allocate as a single slab.
799 * We do it in 4K blocks for efficiency. The "3" is 2 for the next/prev
800 * pointers, plus 1 for any mythical malloc overhead. */
802 #define PERL_REGMATCH_SLAB_SLOTS \
803 ((4096 - 3 * sizeof (void*)) / sizeof(regmatch_state))
805 typedef struct regmatch_slab {
806 regmatch_state states[PERL_REGMATCH_SLAB_SLOTS];
807 struct regmatch_slab *prev, *next;
814 * c-indentation-style: bsd
816 * indent-tabs-mode: nil
819 * ex: set ts=8 sts=4 sw=4 et: