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 {
41 SV *substr; /* non-utf8 variant */
42 SV *utf8_substr; /* utf8 variant */
45 struct reg_substr_data {
46 struct reg_substr_datum data[3]; /* Actual array */
50 #define SV_SAVED_COPY SV *saved_copy; /* If non-NULL, SV which is COW from original */
55 /* offsets within a string of a particular /(.)/ capture */
57 typedef struct regexp_paren_pair {
60 /* 'start_tmp' records a new opening position before the matching end
61 * has been found, so that the old start and end values are still
63 * "abc" =~ /(.(?{print "[$1]"}))+/
65 * This field is not part of the API. */
69 #if defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_UTF8_C)
70 #define _invlist_union(a, b, output) _invlist_union_maybe_complement_2nd(a, b, FALSE, output)
71 #define _invlist_intersection(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, FALSE, output)
73 /* Subtracting b from a leaves in a everything that was there that isn't in b,
74 * that is the intersection of a with b's complement */
75 #define _invlist_subtract(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, TRUE, output)
78 /* record the position of a (?{...}) within a pattern */
80 struct reg_code_block {
89 The regexp/REGEXP struct, see L<perlreapi> for further documentation
90 on the individual fields. The struct is ordered so that the most
91 commonly used fields are placed at the start.
93 Any patch that adds items to this struct will need to include
94 changes to F<sv.c> (C<Perl_re_dup()>) and F<regcomp.c>
95 (C<pregfree()>). This involves freeing or cloning items in the
96 regexp's data array based on the data item's type.
99 #define _REGEXP_COMMON \
100 /* what engine created this regexp? */ \
101 const struct regexp_engine* engine; \
102 REGEXP *mother_re; /* what re is this a lightweight copy of? */ \
103 HV *paren_names; /* Optional hash of paren names */ \
104 /* Information about the match that the perl core uses to */ \
105 /* manage things */ \
106 U32 extflags; /* Flags used both externally and internally */ \
107 SSize_t minlen; /* mininum possible number of chars in string to match */\
108 SSize_t minlenret; /* mininum possible number of chars in $& */ \
109 STRLEN gofs; /* chars left of pos that we search from */ \
110 /* substring data about strings that must appear in the */ \
111 /* final match, used for optimisations */ \
112 struct reg_substr_data *substrs; \
113 U32 nparens; /* number of capture buffers */ \
114 /* private engine specific data */ \
115 U32 intflags; /* Engine Specific Internal flags */ \
116 void *pprivate; /* Data private to the regex engine which */ \
117 /* created this object. */ \
118 /* Data about the last/current match. These are modified */ \
119 /* during matching */ \
120 U32 lastparen; /* last open paren matched */ \
121 U32 lastcloseparen; /* last close paren matched */ \
122 /* Array of offsets for (@-) and (@+) */ \
123 regexp_paren_pair *offs; \
124 /* saved or original string so \digit works forever. */ \
126 SV_SAVED_COPY /* If non-NULL, SV which is COW from original */\
127 SSize_t sublen; /* Length of string pointed by subbeg */ \
128 SSize_t suboffset; /* byte offset of subbeg from logical start of str */ \
129 SSize_t subcoffset; /* suboffset equiv, but in chars (for @-/@+) */ \
130 /* Information about the match that isn't often used */ \
131 SSize_t maxlen; /* mininum possible number of chars in string to match */\
132 /* offset from wrapped to the start of precomp */ \
133 PERL_BITFIELD32 pre_prefix:4; \
134 /* original flags used to compile the pattern, may differ */ \
135 /* from extflags in various ways */ \
136 PERL_BITFIELD32 compflags:9; \
137 CV *qr_anoncv /* the anon sub wrapped round qr/(?{..})/ */
139 typedef struct regexp {
144 #define RXp_PAREN_NAMES(rx) ((rx)->paren_names)
146 /* used for high speed searches */
147 typedef struct re_scream_pos_data_s
149 char **scream_olds; /* match pos */
150 SSize_t *scream_pos; /* Internal iterator of scream. */
151 } re_scream_pos_data;
153 /* regexp_engine structure. This is the dispatch table for regexes.
154 * Any regex engine implementation must be able to build one of these.
156 typedef struct regexp_engine {
157 REGEXP* (*comp) (pTHX_ SV * const pattern, U32 flags);
158 I32 (*exec) (pTHX_ REGEXP * const rx, char* stringarg, char* strend,
159 char* strbeg, SSize_t minend, SV* sv,
160 void* data, U32 flags);
161 char* (*intuit) (pTHX_
164 const char * const strbeg,
168 re_scream_pos_data *data);
169 SV* (*checkstr) (pTHX_ REGEXP * const rx);
170 void (*free) (pTHX_ REGEXP * const rx);
171 void (*numbered_buff_FETCH) (pTHX_ REGEXP * const rx, const I32 paren,
173 void (*numbered_buff_STORE) (pTHX_ REGEXP * const rx, const I32 paren,
174 SV const * const value);
175 I32 (*numbered_buff_LENGTH) (pTHX_ REGEXP * const rx, const SV * const sv,
177 SV* (*named_buff) (pTHX_ REGEXP * const rx, SV * const key,
178 SV * const value, const U32 flags);
179 SV* (*named_buff_iter) (pTHX_ REGEXP * const rx, const SV * const lastkey,
181 SV* (*qr_package)(pTHX_ REGEXP * const rx);
183 void* (*dupe) (pTHX_ REGEXP * const rx, CLONE_PARAMS *param);
185 REGEXP* (*op_comp) (pTHX_ SV ** const patternp, int pat_count,
186 OP *expr, const struct regexp_engine* eng,
188 bool *is_bare_re, U32 orig_rx_flags, U32 pm_flags);
192 These are passed to the numbered capture variable callbacks as the
193 paren name. >= 1 is reserved for actual numbered captures, i.e. $1,
196 #define RX_BUFF_IDX_CARET_PREMATCH -5 /* ${^PREMATCH} */
197 #define RX_BUFF_IDX_CARET_POSTMATCH -4 /* ${^POSTMATCH} */
198 #define RX_BUFF_IDX_CARET_FULLMATCH -3 /* ${^MATCH} */
199 #define RX_BUFF_IDX_PREMATCH -2 /* $` */
200 #define RX_BUFF_IDX_POSTMATCH -1 /* $' */
201 #define RX_BUFF_IDX_FULLMATCH 0 /* $& */
204 Flags that are passed to the named_buff and named_buff_iter
205 callbacks above. Those routines are called from universal.c via the
206 Tie::Hash::NamedCapture interface for %+ and %- and the re::
207 functions in the same file.
210 /* The Tie::Hash::NamedCapture operation this is part of, if any */
211 #define RXapif_FETCH 0x0001
212 #define RXapif_STORE 0x0002
213 #define RXapif_DELETE 0x0004
214 #define RXapif_CLEAR 0x0008
215 #define RXapif_EXISTS 0x0010
216 #define RXapif_SCALAR 0x0020
217 #define RXapif_FIRSTKEY 0x0040
218 #define RXapif_NEXTKEY 0x0080
220 /* Whether %+ or %- is being operated on */
221 #define RXapif_ONE 0x0100 /* %+ */
222 #define RXapif_ALL 0x0200 /* %- */
224 /* Whether this is being called from a re:: function */
225 #define RXapif_REGNAME 0x0400
226 #define RXapif_REGNAMES 0x0800
227 #define RXapif_REGNAMES_COUNT 0x1000
230 =head1 REGEXP Functions
232 =for apidoc Am|REGEXP *|SvRX|SV *sv
234 Convenience macro to get the REGEXP from a SV. This is approximately
235 equivalent to the following snippet:
240 sv = MUTABLE_SV(SvRV(sv));
241 if (SvTYPE(sv) == SVt_REGEXP)
244 NULL will be returned if a REGEXP* is not found.
246 =for apidoc Am|bool|SvRXOK|SV* sv
248 Returns a boolean indicating whether the SV (or the one it references)
251 If you want to do something with the REGEXP* later use SvRX instead
257 #define SvRX(sv) (Perl_get_re_arg(aTHX_ sv))
258 #define SvRXOK(sv) (Perl_get_re_arg(aTHX_ sv) ? TRUE : FALSE)
261 /* Flags stored in regexp->extflags
262 * These are used by code external to the regexp engine
264 * Note that the flags whose names start with RXf_PMf_ are defined in
265 * op_reg_common.h, being copied from the parallel flags of op_pmflags
267 * NOTE: if you modify any RXf flags you should run regen.pl or
268 * regen/regcomp.pl so that regnodes.h is updated with the changes.
272 #include "op_reg_common.h"
274 #define RXf_PMf_STD_PMMOD (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_FOLD|RXf_PMf_EXTENDED)
276 #define CASE_STD_PMMOD_FLAGS_PARSE_SET(pmfl) \
277 case IGNORE_PAT_MOD: *(pmfl) |= RXf_PMf_FOLD; break; \
278 case MULTILINE_PAT_MOD: *(pmfl) |= RXf_PMf_MULTILINE; break; \
279 case SINGLE_PAT_MOD: *(pmfl) |= RXf_PMf_SINGLELINE; break; \
280 case XTENDED_PAT_MOD: *(pmfl) |= RXf_PMf_EXTENDED; break
282 /* Note, includes charset ones, assumes 0 is the default for them */
283 #define STD_PMMOD_FLAGS_CLEAR(pmfl) \
284 *(pmfl) &= ~(RXf_PMf_FOLD|RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_EXTENDED|RXf_PMf_CHARSET)
286 /* chars and strings used as regex pattern modifiers
287 * Singular is a 'c'har, plural is a "string"
289 * NOTE, KEEPCOPY was originally 'k', but was changed to 'p' for preserve
290 * for compatibility reasons with Regexp::Common which highjacked (?k:...)
291 * for its own uses. So 'k' is out as well.
293 #define DEFAULT_PAT_MOD '^' /* Short for all the default modifiers */
294 #define EXEC_PAT_MOD 'e'
295 #define KEEPCOPY_PAT_MOD 'p'
296 #define ONCE_PAT_MOD 'o'
297 #define GLOBAL_PAT_MOD 'g'
298 #define CONTINUE_PAT_MOD 'c'
299 #define MULTILINE_PAT_MOD 'm'
300 #define SINGLE_PAT_MOD 's'
301 #define IGNORE_PAT_MOD 'i'
302 #define XTENDED_PAT_MOD 'x'
303 #define NONDESTRUCT_PAT_MOD 'r'
304 #define LOCALE_PAT_MOD 'l'
305 #define UNICODE_PAT_MOD 'u'
306 #define DEPENDS_PAT_MOD 'd'
307 #define ASCII_RESTRICT_PAT_MOD 'a'
309 #define ONCE_PAT_MODS "o"
310 #define KEEPCOPY_PAT_MODS "p"
311 #define EXEC_PAT_MODS "e"
312 #define LOOP_PAT_MODS "gc"
313 #define NONDESTRUCT_PAT_MODS "r"
314 #define LOCALE_PAT_MODS "l"
315 #define UNICODE_PAT_MODS "u"
316 #define DEPENDS_PAT_MODS "d"
317 #define ASCII_RESTRICT_PAT_MODS "a"
318 #define ASCII_MORE_RESTRICT_PAT_MODS "aa"
320 /* This string is expected by regcomp.c to be ordered so that the first
321 * character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of extflags; the next
322 * character is bit +1, etc. */
323 #define STD_PAT_MODS "msix"
325 #define CHARSET_PAT_MODS ASCII_RESTRICT_PAT_MODS DEPENDS_PAT_MODS LOCALE_PAT_MODS UNICODE_PAT_MODS
327 /* This string is expected by XS_re_regexp_pattern() in universal.c to be ordered
328 * so that the first character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of
329 * extflags; the next character is in bit +1, etc. */
330 #define INT_PAT_MODS STD_PAT_MODS KEEPCOPY_PAT_MODS
332 #define EXT_PAT_MODS ONCE_PAT_MODS KEEPCOPY_PAT_MODS
333 #define QR_PAT_MODS STD_PAT_MODS EXT_PAT_MODS CHARSET_PAT_MODS
334 #define M_PAT_MODS QR_PAT_MODS LOOP_PAT_MODS
335 #define S_PAT_MODS M_PAT_MODS EXEC_PAT_MODS NONDESTRUCT_PAT_MODS
338 * NOTE: if you modify any RXf flags you should run regen.pl or
339 * regen/regcomp.pl so that regnodes.h is updated with the changes.
343 /* Leave some space, so future bit allocations can go either in the shared or
344 * unshared area without affecting binary compatibility */
345 #define RXf_BASE_SHIFT (_RXf_PMf_SHIFT_NEXT)
348 Set in Perl_pmruntime if op_flags & OPf_SPECIAL, i.e. split. Will
349 be used by regex engines to check whether they should set
352 #define RXf_SPLIT (1<<(RXf_BASE_SHIFT-1))
353 #if RXf_SPLIT != RXf_PMf_SPLIT
354 # error "RXf_SPLIT does not match RXf_PMf_SPLIT"
357 /* Manually decorate this function with gcc-style attributes just to
358 * avoid having to restructure the header files and their called order,
359 * as proto.h would have to be included before this file, and isn't */
361 PERL_STATIC_INLINE const char *
362 get_regex_charset_name(const U32 flags, STRLEN* const lenp)
363 __attribute__warn_unused_result__;
365 #define MAX_CHARSET_NAME_LENGTH 2
367 PERL_STATIC_INLINE const char *
368 get_regex_charset_name(const U32 flags, STRLEN* const lenp)
370 /* Returns a string that corresponds to the name of the regex character set
371 * given by 'flags', and *lenp is set the length of that string, which
372 * cannot exceed MAX_CHARSET_NAME_LENGTH characters */
375 switch (get_regex_charset(flags)) {
376 case REGEX_DEPENDS_CHARSET: return DEPENDS_PAT_MODS;
377 case REGEX_LOCALE_CHARSET: return LOCALE_PAT_MODS;
378 case REGEX_UNICODE_CHARSET: return UNICODE_PAT_MODS;
379 case REGEX_ASCII_RESTRICTED_CHARSET: return ASCII_RESTRICT_PAT_MODS;
380 case REGEX_ASCII_MORE_RESTRICTED_CHARSET:
382 return ASCII_MORE_RESTRICT_PAT_MODS;
384 return "?"; /* Unknown */
388 /* Do we have some sort of anchor? */
389 #define RXf_IS_ANCHORED (1<<(RXf_BASE_SHIFT+0))
390 #define RXf_UNUSED1 (1<<(RXf_BASE_SHIFT+1))
391 #define RXf_UNUSED2 (1<<(RXf_BASE_SHIFT+2))
392 #define RXf_UNUSED3 (1<<(RXf_BASE_SHIFT+3))
393 #define RXf_UNUSED4 (1<<(RXf_BASE_SHIFT+4))
394 #define RXf_UNUSED5 (1<<(RXf_BASE_SHIFT+5))
396 /* What we have seen */
397 #define RXf_NO_INPLACE_SUBST (1<<(RXf_BASE_SHIFT+6))
398 #define RXf_EVAL_SEEN (1<<(RXf_BASE_SHIFT+7))
399 #define RXf_UNUSED8 (1<<(RXf_BASE_SHIFT+8))
402 #define RXf_UNBOUNDED_QUANTIFIER_SEEN (1<<(RXf_BASE_SHIFT+9))
403 #define RXf_CHECK_ALL (1<<(RXf_BASE_SHIFT+10))
406 #define RXf_MATCH_UTF8 (1<<(RXf_BASE_SHIFT+11)) /* $1 etc are utf8 */
409 #define RXf_USE_INTUIT_NOML (1<<(RXf_BASE_SHIFT+12))
410 #define RXf_USE_INTUIT_ML (1<<(RXf_BASE_SHIFT+13))
411 #define RXf_INTUIT_TAIL (1<<(RXf_BASE_SHIFT+14))
412 #define RXf_USE_INTUIT (RXf_USE_INTUIT_NOML|RXf_USE_INTUIT_ML)
414 /* Copy and tainted info */
415 #define RXf_COPY_DONE (1<<(RXf_BASE_SHIFT+16))
417 /* during execution: pattern temporarily tainted by executing locale ops;
418 * post-execution: $1 et al are tainted */
419 #define RXf_TAINTED_SEEN (1<<(RXf_BASE_SHIFT+17))
420 /* this pattern was tainted during compilation */
421 #define RXf_TAINTED (1<<(RXf_BASE_SHIFT+18))
423 /* Flags indicating special patterns */
424 #define RXf_START_ONLY (1<<(RXf_BASE_SHIFT+19)) /* Pattern is /^/ */
425 #define RXf_SKIPWHITE (1<<(RXf_BASE_SHIFT+20)) /* Pattern is for a split " " */
426 #define RXf_WHITE (1<<(RXf_BASE_SHIFT+21)) /* Pattern is /\s+/ */
427 #define RXf_NULL (1U<<(RXf_BASE_SHIFT+22)) /* Pattern is // */
428 #if RXf_BASE_SHIFT+22 > 31
429 # error Too many RXf_PMf bits used. See regnodes.h for any spare in middle
433 * NOTE: if you modify any RXf flags you should run regen.pl or
434 * regen/regcomp.pl so that regnodes.h is updated with the changes.
439 # define RX_ISTAINTED(prog) 0
440 # define RX_TAINT_on(prog) NOOP
441 # define RXp_MATCH_TAINTED(prog) 0
442 # define RX_MATCH_TAINTED(prog) 0
443 # define RXp_MATCH_TAINTED_on(prog) NOOP
444 # define RX_MATCH_TAINTED_on(prog) NOOP
445 # define RX_MATCH_TAINTED_off(prog) NOOP
447 # define RX_ISTAINTED(prog) (RX_EXTFLAGS(prog) & RXf_TAINTED)
448 # define RX_TAINT_on(prog) (RX_EXTFLAGS(prog) |= RXf_TAINTED)
449 # define RXp_MATCH_TAINTED(prog) (RXp_EXTFLAGS(prog) & RXf_TAINTED_SEEN)
450 # define RX_MATCH_TAINTED(prog) (RX_EXTFLAGS(prog) & RXf_TAINTED_SEEN)
451 # define RXp_MATCH_TAINTED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_TAINTED_SEEN)
452 # define RX_MATCH_TAINTED_on(prog) (RX_EXTFLAGS(prog) |= RXf_TAINTED_SEEN)
453 # define RX_MATCH_TAINTED_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_TAINTED_SEEN)
456 #define RX_HAS_CUTGROUP(prog) ((prog)->intflags & PREGf_CUTGROUP_SEEN)
457 #define RX_MATCH_TAINTED_set(prog, t) ((t) \
458 ? RX_MATCH_TAINTED_on(prog) \
459 : RX_MATCH_TAINTED_off(prog))
461 #define RXp_MATCH_COPIED(prog) (RXp_EXTFLAGS(prog) & RXf_COPY_DONE)
462 #define RX_MATCH_COPIED(prog) (RX_EXTFLAGS(prog) & RXf_COPY_DONE)
463 #define RXp_MATCH_COPIED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_COPY_DONE)
464 #define RX_MATCH_COPIED_on(prog) (RX_EXTFLAGS(prog) |= RXf_COPY_DONE)
465 #define RXp_MATCH_COPIED_off(prog) (RXp_EXTFLAGS(prog) &= ~RXf_COPY_DONE)
466 #define RX_MATCH_COPIED_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_COPY_DONE)
467 #define RX_MATCH_COPIED_set(prog,t) ((t) \
468 ? RX_MATCH_COPIED_on(prog) \
469 : RX_MATCH_COPIED_off(prog))
471 #define RXp_EXTFLAGS(rx) ((rx)->extflags)
472 #define RXp_COMPFLAGS(rx) ((rx)->compflags)
474 /* For source compatibility. We used to store these explicitly. */
475 #define RX_PRECOMP(prog) (RX_WRAPPED(prog) + ReANY(prog)->pre_prefix)
476 #define RX_PRECOMP_const(prog) (RX_WRAPPED_const(prog) + ReANY(prog)->pre_prefix)
477 /* FIXME? Are we hardcoding too much here and constraining plugin extension
478 writers? Specifically, the value 1 assumes that the wrapped version always
479 has exactly one character at the end, a ')'. Will that always be true? */
480 #define RX_PRELEN(prog) (RX_WRAPLEN(prog) - ReANY(prog)->pre_prefix - 1)
481 #define RX_WRAPPED(prog) ReANY(prog)->xpv_len_u.xpvlenu_pv
482 #define RX_WRAPPED_const(prog) ((const char *)RX_WRAPPED(prog))
483 #define RX_WRAPLEN(prog) SvCUR(prog)
484 #define RX_CHECK_SUBSTR(prog) (ReANY(prog)->check_substr)
485 #define RX_REFCNT(prog) SvREFCNT(prog)
486 #define RX_EXTFLAGS(prog) RXp_EXTFLAGS(ReANY(prog))
487 #define RX_COMPFLAGS(prog) RXp_COMPFLAGS(ReANY(prog))
488 #define RX_ENGINE(prog) (ReANY(prog)->engine)
489 #define RX_SUBBEG(prog) (ReANY(prog)->subbeg)
490 #define RX_SUBOFFSET(prog) (ReANY(prog)->suboffset)
491 #define RX_SUBCOFFSET(prog) (ReANY(prog)->subcoffset)
492 #define RX_OFFS(prog) (ReANY(prog)->offs)
493 #define RX_NPARENS(prog) (ReANY(prog)->nparens)
494 #define RX_SUBLEN(prog) (ReANY(prog)->sublen)
495 #define RX_MINLEN(prog) (ReANY(prog)->minlen)
496 #define RX_MINLENRET(prog) (ReANY(prog)->minlenret)
497 #define RX_GOFS(prog) (ReANY(prog)->gofs)
498 #define RX_LASTPAREN(prog) (ReANY(prog)->lastparen)
499 #define RX_LASTCLOSEPAREN(prog) (ReANY(prog)->lastcloseparen)
500 #define RX_SAVED_COPY(prog) (ReANY(prog)->saved_copy)
501 /* last match was zero-length */
502 #define RX_ZERO_LEN(prog) \
503 (RX_OFFS(prog)[0].start + (SSize_t)RX_GOFS(prog) \
504 == RX_OFFS(prog)[0].end)
506 #endif /* PLUGGABLE_RE_EXTENSION */
508 /* Stuff that needs to be included in the pluggable extension goes below here */
511 #define RX_MATCH_COPY_FREE(rx) \
512 STMT_START {if (RX_SAVED_COPY(rx)) { \
513 SV_CHECK_THINKFIRST_COW_DROP(RX_SAVED_COPY(rx)); \
515 if (RX_MATCH_COPIED(rx)) { \
516 Safefree(RX_SUBBEG(rx)); \
517 RX_MATCH_COPIED_off(rx); \
520 #define RX_MATCH_COPY_FREE(rx) \
521 STMT_START {if (RX_MATCH_COPIED(rx)) { \
522 Safefree(RX_SUBBEG(rx)); \
523 RX_MATCH_COPIED_off(rx); \
527 #define RXp_MATCH_UTF8(prog) (RXp_EXTFLAGS(prog) & RXf_MATCH_UTF8)
528 #define RX_MATCH_UTF8(prog) (RX_EXTFLAGS(prog) & RXf_MATCH_UTF8)
529 #define RX_MATCH_UTF8_on(prog) (RX_EXTFLAGS(prog) |= RXf_MATCH_UTF8)
530 #define RX_MATCH_UTF8_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_MATCH_UTF8)
531 #define RX_MATCH_UTF8_set(prog, t) ((t) \
532 ? RX_MATCH_UTF8_on(prog) \
533 : RX_MATCH_UTF8_off(prog))
535 /* Whether the pattern stored at RX_WRAPPED is in UTF-8 */
536 #define RX_UTF8(prog) SvUTF8(prog)
539 /* bits in flags arg of Perl_regexec_flags() */
541 #define REXEC_COPY_STR 0x01 /* Need to copy the string for captures. */
542 #define REXEC_CHECKED 0x02 /* re_intuit_start() already called. */
543 #define REXEC_SCREAM 0x04 /* currently unused. */
544 #define REXEC_IGNOREPOS 0x08 /* use stringarg, not pos(), for \G match */
545 #define REXEC_NOT_FIRST 0x10 /* This is another iteration of //g:
546 no need to copy string again */
548 /* under REXEC_COPY_STR, it's ok for the
549 engine (modulo PL_sawamperand etc)
550 to skip copying: ... */
551 #define REXEC_COPY_SKIP_PRE 0x20 /* ...the $` part of the string, or */
552 #define REXEC_COPY_SKIP_POST 0x40 /* ...the $' part of the string */
553 #define REXEC_FAIL_ON_UNDERFLOW 0x80 /* fail the match if $& would start before
554 the start pos (so s/.\G// would fail
555 on second iteration */
557 #if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
558 # define ReREFCNT_inc(re) \
560 /* This is here to generate a casting warning if incorrect. */ \
561 REGEXP *const _rerefcnt_inc = (re); \
562 assert(SvTYPE(_rerefcnt_inc) == SVt_REGEXP); \
563 SvREFCNT_inc(_rerefcnt_inc); \
566 # define ReREFCNT_dec(re) \
568 /* This is here to generate a casting warning if incorrect. */ \
569 REGEXP *const _rerefcnt_dec = (re); \
570 SvREFCNT_dec(_rerefcnt_dec); \
573 # define ReREFCNT_dec(re) SvREFCNT_dec(re)
574 # define ReREFCNT_inc(re) ((REGEXP *) SvREFCNT_inc(re))
576 #define ReANY(re) S_ReANY((const REGEXP *)(re))
578 /* FIXME for plugins. */
580 #define FBMcf_TAIL_DOLLAR 1
581 #define FBMcf_TAIL_DOLLARM 2
582 #define FBMcf_TAIL_Z 4
583 #define FBMcf_TAIL_z 8
584 #define FBMcf_TAIL (FBMcf_TAIL_DOLLAR|FBMcf_TAIL_DOLLARM|FBMcf_TAIL_Z|FBMcf_TAIL_z)
586 #define FBMrf_MULTILINE 1
588 struct regmatch_state;
589 struct regmatch_slab;
591 /* like regmatch_info_aux, but contains extra fields only needed if the
592 * pattern contains (?{}). If used, is snuck into the second slot in the
593 * regmatch_state stack at the start of execution */
597 PMOP *curpm; /* saved PL_curpm */
599 SV *saved_copy; /* saved saved_copy field from rex */
601 char *subbeg; /* saved subbeg field from rex */
602 STRLEN sublen; /* saved sublen field from rex */
603 STRLEN suboffset; /* saved suboffset field from rex */
604 STRLEN subcoffset; /* saved subcoffset field from rex */
605 MAGIC *pos_magic; /* pos() magic attached to $_ */
606 SSize_t pos; /* the original value of pos() in pos_magic */
607 U8 pos_flags; /* flags to be restored; currently only MGf_BYTES*/
608 } regmatch_info_aux_eval;
611 /* fields that logically live in regmatch_info, but which need cleaning
612 * up on croak(), and so are instead are snuck into the first slot in
613 * the regmatch_state stack at the start of execution */
616 regmatch_info_aux_eval *info_aux_eval;
617 struct regmatch_state *old_regmatch_state; /* saved PL_regmatch_state */
618 struct regmatch_slab *old_regmatch_slab; /* saved PL_regmatch_slab */
619 char *poscache; /* S-L cache of fail positions of WHILEMs */
623 /* some basic information about the current match that is created by
624 * Perl_regexec_flags and then passed to regtry(), regmatch() etc.
625 * It is allocated as a local var on the stack, so nothing should be
626 * stored in it that needs preserving or clearing up on croak().
627 * For that, see the aux_info and aux_info_eval members of the
628 * regmatch_state union. */
631 REGEXP *prog; /* the regex being executed */
632 const char * strbeg; /* real start of string */
633 char *strend; /* one byte beyond last char of match string */
634 char *till; /* matches shorter than this fail (see minlen arg) */
635 SV *sv; /* the SV string currently being matched */
636 char *ganch; /* position of \G anchor */
637 char *cutpoint; /* (*COMMIT) position (if any) */
638 regmatch_info_aux *info_aux; /* extra fields that need cleanup */
639 regmatch_info_aux_eval *info_aux_eval; /* extra saved state for (?{}) */
640 I32 poscache_maxiter; /* how many whilems todo before S-L cache kicks in */
641 I32 poscache_iter; /* current countdown from _maxiter to zero */
642 STRLEN poscache_size; /* size of regmatch_info_aux.poscache */
643 bool intuit; /* re_intuit_start() is the top-level caller */
644 bool is_utf8_pat; /* regex is utf8 */
645 bool is_utf8_target; /* string being matched is utf8 */
646 bool warned; /* we have issued a recursion warning; no need for more */
650 /* structures for holding and saving the state maintained by regmatch() */
652 #ifndef MAX_RECURSE_EVAL_NOCHANGE_DEPTH
653 #define MAX_RECURSE_EVAL_NOCHANGE_DEPTH 1000
656 typedef I32 CHECKPOINT;
658 typedef struct regmatch_state {
659 int resume_state; /* where to jump to on return */
660 char *locinput; /* where to backtrack in string on failure */
664 /* the 'info_aux' and 'info_aux_eval' union members are cuckoos in
665 * the nest. They aren't saved backtrack state; rather they
666 * represent one or two extra chunks of data that need allocating
667 * at the start of a match. These fields would logically live in
668 * the regmatch_info struct, except that is allocated on the
669 * C stack, and these fields are all things that require cleanup
670 * after a croak(), when the stack is lost.
671 * As a convenience, we just use the first 1 or 2 regmatch_state
672 * slots to store this info, as we will be allocating a slab of
673 * these anyway. Otherwise we'd have to malloc and then free them,
674 * or allocate them on the save stack (where they will get
675 * realloced if the save stack grows).
676 * info_aux contains the extra fields that are always needed;
677 * info_aux_eval contains extra fields that only needed if
678 * the pattern contains code blocks
679 * We split them into two separate structs to avoid increasing
680 * the size of the union.
683 regmatch_info_aux info_aux;
685 regmatch_info_aux_eval info_aux_eval;
687 /* this is a fake union member that matches the first element
688 * of each member that needs to store positive backtrack
691 struct regmatch_state *prev_yes_state;
694 /* branchlike members */
695 /* this is a fake union member that matches the first elements
696 * of each member that needs to behave like a branch */
698 /* this first element must match u.yes */
699 struct regmatch_state *prev_yes_state;
707 /* the first elements must match u.branchlike */
708 struct regmatch_state *prev_yes_state;
713 regnode *next_branch; /* next branch node */
717 /* the first elements must match u.branchlike */
718 struct regmatch_state *prev_yes_state;
723 U32 accepted; /* how many accepting states left */
724 bool longfold;/* saw a fold with a 1->n char mapping */
725 U16 *jump; /* positive offsets from me */
726 regnode *me; /* Which node am I - needed for jump tries*/
727 U8 *firstpos;/* pos in string of first trie match */
728 U32 firstchars;/* len in chars of firstpos from start */
729 U16 nextword;/* next word to try */
730 U16 topword; /* longest accepted word */
733 /* special types - these members are used to store state for special
734 regops like eval, if/then, lookaround and the markpoint state */
736 /* this first element must match u.yes */
737 struct regmatch_state *prev_yes_state;
738 struct regmatch_state *prev_eval;
739 struct regmatch_state *prev_curlyx;
741 CHECKPOINT cp; /* remember current savestack indexes */
743 U32 close_paren; /* which close bracket is our end */
744 regnode *B; /* the node following us */
748 /* this first element must match u.yes */
749 struct regmatch_state *prev_yes_state;
751 I32 logical; /* saved copy of 'logical' var */
752 regnode *me; /* the IFMATCH/SUSPEND/UNLESSM node */
753 } ifmatch; /* and SUSPEND/UNLESSM */
756 /* this first element must match u.yes */
757 struct regmatch_state *prev_yes_state;
758 struct regmatch_state *prev_mark;
767 /* quantifiers - these members are used for storing state for
768 for the regops used to implement quantifiers */
770 /* this first element must match u.yes */
771 struct regmatch_state *prev_yes_state;
772 struct regmatch_state *prev_curlyx; /* previous cur_curlyx */
773 regnode *me; /* the CURLYX node */
774 regnode *B; /* the B node in /A*B/ */
775 CHECKPOINT cp; /* remember current savestack index */
777 int parenfloor;/* how far back to strip paren data */
779 /* these two are modified by WHILEM */
780 int count; /* how many instances of A we've matched */
781 char *lastloc;/* where previous A matched (0-len detect) */
785 /* this first element must match u.yes */
786 struct regmatch_state *prev_yes_state;
787 struct regmatch_state *save_curlyx;
788 CHECKPOINT cp; /* remember current savestack indexes */
790 char *save_lastloc; /* previous curlyx.lastloc */
796 /* this first element must match u.yes */
797 struct regmatch_state *prev_yes_state;
798 int c1, c2; /* case fold search */
802 I32 alen; /* length of first-matched A string */
805 regnode *A, *B; /* the nodes corresponding to /A*B/ */
806 regnode *me; /* the curlym node */
807 U8 c1_utf8[UTF8_MAXBYTES+1]; /* */
808 U8 c2_utf8[UTF8_MAXBYTES+1];
816 int c1, c2; /* case fold search */
817 char *maxpos; /* highest possible point in string to match */
818 char *oldloc; /* the previous locinput */
820 int min, max; /* {m,n} */
821 regnode *A, *B; /* the nodes corresponding to /A*B/ */
822 U8 c1_utf8[UTF8_MAXBYTES+1]; /* */
823 U8 c2_utf8[UTF8_MAXBYTES+1];
824 } curly; /* and CURLYN/PLUS/STAR */
829 /* how many regmatch_state structs to allocate as a single slab.
830 * We do it in 4K blocks for efficiency. The "3" is 2 for the next/prev
831 * pointers, plus 1 for any mythical malloc overhead. */
833 #define PERL_REGMATCH_SLAB_SLOTS \
834 ((4096 - 3 * sizeof (void*)) / sizeof(regmatch_state))
836 typedef struct regmatch_slab {
837 regmatch_state states[PERL_REGMATCH_SLAB_SLOTS];
838 struct regmatch_slab *prev, *next;
845 * c-indentation-style: bsd
847 * indent-tabs-mode: nil
850 * ex: set ts=8 sts=4 sw=4 et: