3 * Copyright (C) 1993, 1994, 1996, 1997, 1999, 2000, 2001, 2003,
4 * 2005, 2006 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'*/
27 typedef struct regnode regnode;
29 struct reg_substr_data;
36 struct reg_substr_datum {
39 SV *substr; /* non-utf8 variant */
40 SV *utf8_substr; /* utf8 variant */
43 struct reg_substr_data {
44 struct reg_substr_datum data[3]; /* Actual array */
47 #ifdef PERL_OLD_COPY_ON_WRITE
48 #define SV_SAVED_COPY SV *saved_copy; /* If non-NULL, SV which is COW from original */
53 typedef struct regexp_paren_pair {
59 The regexp/REGEXP struct, see L<perlreapi> for further documentation
60 on the individual fields. The struct is ordered so that the most
61 commonly used fields are placed at the start.
63 Any patch that adds items to this struct will need to include
64 changes to F<sv.c> (C<Perl_re_dup()>) and F<regcomp.c>
65 (C<pregfree()>). This involves freeing or cloning items in the
66 regexp's data array based on the data item's type.
69 typedef struct regexp {
70 /* what engine created this regexp? */
71 const struct regexp_engine* engine;
72 struct regexp* mother_re; /* what re is this a lightweight copy of? */
74 /* Information about the match that the perl core uses to manage things */
75 U32 extflags; /* Flags used both externally and internally */
76 I32 minlen; /* mininum possible length of string to match */
77 I32 minlenret; /* mininum possible length of $& */
78 U32 gofs; /* chars left of pos that we search from */
79 struct reg_substr_data *substrs; /* substring data about strings that must appear
80 in the final match, used for optimisations */
81 U32 nparens; /* number of capture buffers */
83 /* private engine specific data */
84 U32 intflags; /* Engine Specific Internal flags */
85 void *pprivate; /* Data private to the regex engine which
86 created this object. */
88 /* Data about the last/current match. These are modified during matching*/
89 U32 lastparen; /* last open paren matched */
90 U32 lastcloseparen; /* last close paren matched */
91 regexp_paren_pair *swap; /* Swap copy of *offs */
92 regexp_paren_pair *offs; /* Array of offsets for (@-) and (@+) */
94 char *subbeg; /* saved or original string
95 so \digit works forever. */
96 SV_SAVED_COPY /* If non-NULL, SV which is COW from original */
97 I32 sublen; /* Length of string pointed by subbeg */
100 /* Information about the match that isn't often used */
101 I32 prelen; /* length of precomp */
102 const char *precomp; /* pre-compilation regular expression */
103 /* wrapped can't be const char*, as it is returned by sv_2pv_flags */
104 char *wrapped; /* wrapped version of the pattern */
105 I32 wraplen; /* length of wrapped */
106 I32 seen_evals; /* number of eval groups in the pattern - for security checks */
107 HV *paren_names; /* Optional hash of paren names */
109 /* Refcount of this regexp */
110 I32 refcnt; /* Refcount of this regexp */
113 /* used for high speed searches */
114 typedef struct re_scream_pos_data_s
116 char **scream_olds; /* match pos */
117 I32 *scream_pos; /* Internal iterator of scream. */
118 } re_scream_pos_data;
120 /* regexp_engine structure. This is the dispatch table for regexes.
121 * Any regex engine implementation must be able to build one of these.
123 typedef struct regexp_engine {
124 REGEXP* (*comp) (pTHX_ const SV * const pattern, const U32 flags);
125 I32 (*exec) (pTHX_ REGEXP * const rx, char* stringarg, char* strend,
126 char* strbeg, I32 minend, SV* screamer,
127 void* data, U32 flags);
128 char* (*intuit) (pTHX_ REGEXP * const rx, SV *sv, char *strpos,
129 char *strend, const U32 flags,
130 re_scream_pos_data *data);
131 SV* (*checkstr) (pTHX_ REGEXP * const rx);
132 void (*free) (pTHX_ REGEXP * const rx);
133 void (*numbered_buff_FETCH) (pTHX_ REGEXP * const rx, const I32 paren,
135 void (*numbered_buff_STORE) (pTHX_ REGEXP * const rx, const I32 paren,
136 SV const * const value);
137 I32 (*numbered_buff_LENGTH) (pTHX_ REGEXP * const rx, const SV * const sv,
139 SV* (*named_buff) (pTHX_ REGEXP * const rx, SV * const key,
140 SV * const value, const U32 flags);
141 SV* (*named_buff_iter) (pTHX_ REGEXP * const rx, const SV * const lastkey,
143 SV* (*qr_package)(pTHX_ REGEXP * const rx);
145 void* (*dupe) (pTHX_ REGEXP * const rx, CLONE_PARAMS *param);
150 These are passed to the numbered capture variable callbacks as the
151 paren name. >= 1 is reserved for actual numbered captures, i.e. $1,
154 #define RXf_PREMATCH -2 /* $` / ${^PREMATCH} */
155 #define RXf_POSTMATCH -1 /* $' / ${^POSTMATCH} */
156 #define RXf_MATCH 0 /* $& / ${^MATCH} */
159 Flags that are passed to the named_buff and named_buff_iter
160 callbacks above. Those routines are called from universal.c via the
161 Tie::Hash::NamedCapture interface for %+ and %- and the re::
162 functions in the same file.
165 /* The Tie::Hash::NamedCapture operation this is part of, if any */
166 #define RXf_HASH_FETCH 0x0001
167 #define RXf_HASH_STORE 0x0002
168 #define RXf_HASH_DELETE 0x0004
169 #define RXf_HASH_CLEAR 0x0008
170 #define RXf_HASH_EXISTS 0x0010
171 #define RXf_HASH_SCALAR 0x0020
172 #define RXf_HASH_FIRSTKEY 0x0040
173 #define RXf_HASH_NEXTKEY 0x0080
175 /* Whether %+ or %- is being operated on */
176 #define RXf_HASH_ONE 0x0100 /* %+ */
177 #define RXf_HASH_ALL 0x0200 /* %- */
179 /* Whether this is being called from a re:: function */
180 #define RXf_HASH_REGNAME 0x0400
181 #define RXf_HASH_REGNAMES 0x0800
182 #define RXf_HASH_REGNAMES_COUNT 0x1000
185 =head1 REGEXP Functions
187 =for apidoc Am|REGEXP *|SvRX|SV *sv
189 Convenience macro to get the REGEXP from a SV. This is approximately
190 equivalent to the following snippet:
195 (tmpsv = (SV*)SvRV(sv)) &&
196 SvTYPE(tmpsv) == SVt_PVMG &&
197 (tmpmg = mg_find(tmpsv, PERL_MAGIC_qr)))
199 return (REGEXP *)tmpmg->mg_obj;
202 NULL will be returned if a REGEXP* is not found.
204 =for apidoc Am|bool|SvRXOK|SV* sv
206 Returns a boolean indicating whether the SV contains qr magic
209 If you want to do something with the REGEXP* later use SvRX instead
215 #define SvRX(sv) (Perl_get_re_arg(aTHX_ sv))
216 #define SvRXOK(sv) (Perl_get_re_arg(aTHX_ sv) ? TRUE : FALSE)
219 /* Flags stored in regexp->extflags
220 * These are used by code external to the regexp engine
222 * Note that flags starting with RXf_PMf_ have exact equivalents
223 * stored in op_pmflags and which are defined in op.h, they are defined
224 * numerically here only for clarity.
227 /* Anchor and GPOS related stuff */
228 #define RXf_ANCH_BOL 0x00000001
229 #define RXf_ANCH_MBOL 0x00000002
230 #define RXf_ANCH_SBOL 0x00000004
231 #define RXf_ANCH_GPOS 0x00000008
232 #define RXf_GPOS_SEEN 0x00000010
233 #define RXf_GPOS_FLOAT 0x00000020
235 #define RXf_ANCH (RXf_ANCH_BOL|RXf_ANCH_MBOL|RXf_ANCH_GPOS|RXf_ANCH_SBOL)
236 #define RXf_GPOS_CHECK (RXf_GPOS_SEEN|RXf_ANCH_GPOS)
237 #define RXf_ANCH_SINGLE (RXf_ANCH_SBOL|RXf_ANCH_GPOS)
239 /* Flags indicating special patterns */
240 #define RXf_SKIPWHITE 0x00000100 /* Pattern is for a split / / */
241 #define RXf_START_ONLY 0x00000200 /* Pattern is /^/ */
242 #define RXf_WHITE 0x00000400 /* Pattern is /\s+/ */
244 /* 0x1F800 of extflags is used by (RXf_)PMf_COMPILETIME */
245 #define RXf_PMf_LOCALE 0x00000800 /* use locale */
246 #define RXf_PMf_MULTILINE 0x00001000 /* /m */
247 #define RXf_PMf_SINGLELINE 0x00002000 /* /s */
248 #define RXf_PMf_FOLD 0x00004000 /* /i */
249 #define RXf_PMf_EXTENDED 0x00008000 /* /x */
250 #define RXf_PMf_KEEPCOPY 0x00010000 /* /k */
251 /* these flags are transfered from the PMOP->op_pmflags member during compilation */
252 #define RXf_PMf_STD_PMMOD (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_FOLD|RXf_PMf_EXTENDED)
253 #define RXf_PMf_COMPILETIME (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_LOCALE|RXf_PMf_FOLD|RXf_PMf_EXTENDED|RXf_PMf_KEEPCOPY)
255 #define CASE_STD_PMMOD_FLAGS_PARSE_SET(pmfl) \
256 case IGNORE_PAT_MOD: *(pmfl) |= RXf_PMf_FOLD; break; \
257 case MULTILINE_PAT_MOD: *(pmfl) |= RXf_PMf_MULTILINE; break; \
258 case SINGLE_PAT_MOD: *(pmfl) |= RXf_PMf_SINGLELINE; break; \
259 case XTENDED_PAT_MOD: *(pmfl) |= RXf_PMf_EXTENDED; break
261 /* chars and strings used as regex pattern modifiers
262 * Singlular is a 'c'har, plural is a "string"
264 * NOTE, KEEPCOPY was originally 'k', but was changed to 'p' for preserve
265 * for compatibility reasons with Regexp::Common which highjacked (?k:...)
266 * for its own uses. So 'k' is out as well.
268 #define EXEC_PAT_MOD 'e'
269 #define KEEPCOPY_PAT_MOD 'p'
270 #define ONCE_PAT_MOD 'o'
271 #define GLOBAL_PAT_MOD 'g'
272 #define CONTINUE_PAT_MOD 'c'
273 #define MULTILINE_PAT_MOD 'm'
274 #define SINGLE_PAT_MOD 's'
275 #define IGNORE_PAT_MOD 'i'
276 #define XTENDED_PAT_MOD 'x'
278 #define ONCE_PAT_MODS "o"
279 #define KEEPCOPY_PAT_MODS "p"
280 #define EXEC_PAT_MODS "e"
281 #define LOOP_PAT_MODS "gc"
283 #define STD_PAT_MODS "msix"
285 #define INT_PAT_MODS STD_PAT_MODS KEEPCOPY_PAT_MODS
287 #define EXT_PAT_MODS ONCE_PAT_MODS KEEPCOPY_PAT_MODS
288 #define QR_PAT_MODS STD_PAT_MODS EXT_PAT_MODS
289 #define M_PAT_MODS QR_PAT_MODS LOOP_PAT_MODS
290 #define S_PAT_MODS M_PAT_MODS EXEC_PAT_MODS
293 /* What we have seen */
294 #define RXf_LOOKBEHIND_SEEN 0x00020000
295 #define RXf_EVAL_SEEN 0x00040000
296 #define RXf_CANY_SEEN 0x00080000
299 #define RXf_NOSCAN 0x00100000
300 #define RXf_CHECK_ALL 0x00200000
303 #define RXf_UTF8 0x00400000
304 #define RXf_MATCH_UTF8 0x00800000
307 #define RXf_USE_INTUIT_NOML 0x01000000
308 #define RXf_USE_INTUIT_ML 0x02000000
309 #define RXf_INTUIT_TAIL 0x04000000
312 Set in Perl_pmruntime if op_flags & OPf_SPECIAL, i.e. split. Will
313 be used by regex engines to check whether they should set
316 #define RXf_SPLIT 0x08000000
318 #define RXf_USE_INTUIT (RXf_USE_INTUIT_NOML|RXf_USE_INTUIT_ML)
320 /* Copy and tainted info */
321 #define RXf_COPY_DONE 0x10000000
322 #define RXf_TAINTED_SEEN 0x20000000
323 #define RXf_TAINTED 0x80000000 /* this pattern is tainted */
326 #define RX_HAS_CUTGROUP(prog) ((prog)->intflags & PREGf_CUTGROUP_SEEN)
327 #define RX_MATCH_TAINTED(prog) ((prog)->extflags & RXf_TAINTED_SEEN)
328 #define RX_MATCH_TAINTED_on(prog) ((prog)->extflags |= RXf_TAINTED_SEEN)
329 #define RX_MATCH_TAINTED_off(prog) ((prog)->extflags &= ~RXf_TAINTED_SEEN)
330 #define RX_MATCH_TAINTED_set(prog, t) ((t) \
331 ? RX_MATCH_TAINTED_on(prog) \
332 : RX_MATCH_TAINTED_off(prog))
334 #define RX_MATCH_COPIED(prog) ((prog)->extflags & RXf_COPY_DONE)
335 #define RX_MATCH_COPIED_on(prog) ((prog)->extflags |= RXf_COPY_DONE)
336 #define RX_MATCH_COPIED_off(prog) ((prog)->extflags &= ~RXf_COPY_DONE)
337 #define RX_MATCH_COPIED_set(prog,t) ((t) \
338 ? RX_MATCH_COPIED_on(prog) \
339 : RX_MATCH_COPIED_off(prog))
341 #endif /* PLUGGABLE_RE_EXTENSION */
343 /* Stuff that needs to be included in the plugable extension goes below here */
345 #ifdef PERL_OLD_COPY_ON_WRITE
346 #define RX_MATCH_COPY_FREE(rx) \
347 STMT_START {if (rx->saved_copy) { \
348 SV_CHECK_THINKFIRST_COW_DROP(rx->saved_copy); \
350 if (RX_MATCH_COPIED(rx)) { \
351 Safefree(rx->subbeg); \
352 RX_MATCH_COPIED_off(rx); \
355 #define RX_MATCH_COPY_FREE(rx) \
356 STMT_START {if (RX_MATCH_COPIED(rx)) { \
357 Safefree(rx->subbeg); \
358 RX_MATCH_COPIED_off(rx); \
362 #define RX_MATCH_UTF8(prog) ((prog)->extflags & RXf_MATCH_UTF8)
363 #define RX_MATCH_UTF8_on(prog) ((prog)->extflags |= RXf_MATCH_UTF8)
364 #define RX_MATCH_UTF8_off(prog) ((prog)->extflags &= ~RXf_MATCH_UTF8)
365 #define RX_MATCH_UTF8_set(prog, t) ((t) \
366 ? (RX_MATCH_UTF8_on(prog), (PL_reg_match_utf8 = 1)) \
367 : (RX_MATCH_UTF8_off(prog), (PL_reg_match_utf8 = 0)))
369 #define REXEC_COPY_STR 0x01 /* Need to copy the string. */
370 #define REXEC_CHECKED 0x02 /* check_substr already checked. */
371 #define REXEC_SCREAM 0x04 /* use scream table. */
372 #define REXEC_IGNOREPOS 0x08 /* \G matches at start. */
373 #define REXEC_NOT_FIRST 0x10 /* This is another iteration of //g. */
375 #define ReREFCNT_inc(re) ((void)(re && re->refcnt++), re)
376 #define ReREFCNT_dec(re) CALLREGFREE(re)
378 #define FBMcf_TAIL_DOLLAR 1
379 #define FBMcf_TAIL_DOLLARM 2
380 #define FBMcf_TAIL_Z 4
381 #define FBMcf_TAIL_z 8
382 #define FBMcf_TAIL (FBMcf_TAIL_DOLLAR|FBMcf_TAIL_DOLLARM|FBMcf_TAIL_Z|FBMcf_TAIL_z)
384 #define FBMrf_MULTILINE 1
386 /* an accepting state/position*/
387 struct _reg_trie_accepted {
391 typedef struct _reg_trie_accepted reg_trie_accepted;
393 /* some basic information about the current match that is created by
394 * Perl_regexec_flags and then passed to regtry(), regmatch() etc */
406 /* structures for holding and saving the state maintained by regmatch() */
408 #ifndef MAX_RECURSE_EVAL_NOCHANGE_DEPTH
409 #define MAX_RECURSE_EVAL_NOCHANGE_DEPTH 1000
412 typedef I32 CHECKPOINT;
414 typedef struct regmatch_state {
415 int resume_state; /* where to jump to on return */
416 char *locinput; /* where to backtrack in string on failure */
420 /* this is a fake union member that matches the first element
421 * of each member that needs to store positive backtrack
424 struct regmatch_state *prev_yes_state;
427 /* branchlike members */
428 /* this is a fake union member that matches the first elements
429 * of each member that needs to behave like a branch */
431 /* this first element must match u.yes */
432 struct regmatch_state *prev_yes_state;
439 /* the first elements must match u.branchlike */
440 struct regmatch_state *prev_yes_state;
444 regnode *next_branch; /* next branch node */
448 /* the first elements must match u.branchlike */
449 struct regmatch_state *prev_yes_state;
453 reg_trie_accepted *accept_buff; /* accepting states we have seen */
454 U32 accepted; /* how many accepting states we have seen */
455 U16 *jump; /* positive offsets from me */
456 regnode *B; /* node following the trie */
457 regnode *me; /* Which node am I - needed for jump tries*/
460 /* special types - these members are used to store state for special
461 regops like eval, if/then, lookaround and the markpoint state */
463 /* this first element must match u.yes */
464 struct regmatch_state *prev_yes_state;
465 struct regmatch_state *prev_eval;
466 struct regmatch_state *prev_curlyx;
468 U32 toggle_reg_flags; /* what bits in PL_reg_flags to
469 flip when transitioning between
470 inner and outer rexen */
471 CHECKPOINT cp; /* remember current savestack indexes */
473 U32 close_paren; /* which close bracket is our end */
474 regnode *B; /* the node following us */
478 /* this first element must match u.yes */
479 struct regmatch_state *prev_yes_state;
481 I32 logical; /* saved copy of 'logical' var */
482 regnode *me; /* the IFMATCH/SUSPEND/UNLESSM node */
483 } ifmatch; /* and SUSPEND/UNLESSM */
486 /* this first element must match u.yes */
487 struct regmatch_state *prev_yes_state;
488 struct regmatch_state *prev_mark;
497 /* quantifiers - these members are used for storing state for
498 for the regops used to implement quantifiers */
500 /* this first element must match u.yes */
501 struct regmatch_state *prev_yes_state;
502 struct regmatch_state *prev_curlyx; /* previous cur_curlyx */
503 regnode *A, *B; /* the nodes corresponding to /A*B/ */
504 CHECKPOINT cp; /* remember current savestack index */
506 int parenfloor;/* how far back to strip paren data */
507 int min; /* the minimal number of A's to match */
508 int max; /* the maximal number of A's to match */
510 /* these two are modified by WHILEM */
511 int count; /* how many instances of A we've matched */
512 char *lastloc;/* where previous A matched (0-len detect) */
516 /* this first element must match u.yes */
517 struct regmatch_state *prev_yes_state;
518 struct regmatch_state *save_curlyx;
519 CHECKPOINT cp; /* remember current savestack indexes */
521 char *save_lastloc; /* previous curlyx.lastloc */
527 /* this first element must match u.yes */
528 struct regmatch_state *prev_yes_state;
529 I32 c1, c2; /* case fold search */
531 I32 alen; /* length of first-matched A string */
534 regnode *A, *B; /* the nodes corresponding to /A*B/ */
535 regnode *me; /* the curlym node */
541 I32 c1, c2; /* case fold search */
542 char *maxpos; /* highest possible point in string to match */
543 char *oldloc; /* the previous locinput */
545 int min, max; /* {m,n} */
546 regnode *A, *B; /* the nodes corresponding to /A*B/ */
547 } curly; /* and CURLYN/PLUS/STAR */
552 /* how many regmatch_state structs to allocate as a single slab.
553 * We do it in 4K blocks for efficiency. The "3" is 2 for the next/prev
554 * pointers, plus 1 for any mythical malloc overhead. */
556 #define PERL_REGMATCH_SLAB_SLOTS \
557 ((4096 - 3 * sizeof (void*)) / sizeof(regmatch_state))
559 typedef struct regmatch_slab {
560 regmatch_state states[PERL_REGMATCH_SLAB_SLOTS];
561 struct regmatch_slab *prev, *next;
564 #define PL_reg_flags PL_reg_state.re_state_reg_flags
565 #define PL_bostr PL_reg_state.re_state_bostr
566 #define PL_reginput PL_reg_state.re_state_reginput
567 #define PL_regeol PL_reg_state.re_state_regeol
568 #define PL_regoffs PL_reg_state.re_state_regoffs
569 #define PL_reglastparen PL_reg_state.re_state_reglastparen
570 #define PL_reglastcloseparen PL_reg_state.re_state_reglastcloseparen
571 #define PL_reg_start_tmp PL_reg_state.re_state_reg_start_tmp
572 #define PL_reg_start_tmpl PL_reg_state.re_state_reg_start_tmpl
573 #define PL_reg_eval_set PL_reg_state.re_state_reg_eval_set
574 #define PL_reg_match_utf8 PL_reg_state.re_state_reg_match_utf8
575 #define PL_reg_magic PL_reg_state.re_state_reg_magic
576 #define PL_reg_oldpos PL_reg_state.re_state_reg_oldpos
577 #define PL_reg_oldcurpm PL_reg_state.re_state_reg_oldcurpm
578 #define PL_reg_curpm PL_reg_state.re_state_reg_curpm
579 #define PL_reg_oldsaved PL_reg_state.re_state_reg_oldsaved
580 #define PL_reg_oldsavedlen PL_reg_state.re_state_reg_oldsavedlen
581 #define PL_reg_maxiter PL_reg_state.re_state_reg_maxiter
582 #define PL_reg_leftiter PL_reg_state.re_state_reg_leftiter
583 #define PL_reg_poscache PL_reg_state.re_state_reg_poscache
584 #define PL_reg_poscache_size PL_reg_state.re_state_reg_poscache_size
585 #define PL_regsize PL_reg_state.re_state_regsize
586 #define PL_reg_starttry PL_reg_state.re_state_reg_starttry
587 #define PL_nrs PL_reg_state.re_state_nrs
589 struct re_save_state {
590 U32 re_state_reg_flags; /* from regexec.c */
591 U32 re_state_reg_start_tmpl; /* from regexec.c */
592 I32 re_state_reg_eval_set; /* from regexec.c */
593 bool re_state_reg_match_utf8; /* from regexec.c */
594 char *re_state_bostr;
595 char *re_state_reginput; /* String-input pointer. */
596 char *re_state_regeol; /* End of input, for $ check. */
597 regexp_paren_pair *re_state_regoffs; /* Pointer to start/end pairs */
598 U32 *re_state_reglastparen; /* Similarly for lastparen. */
599 U32 *re_state_reglastcloseparen; /* Similarly for lastcloseparen. */
600 char **re_state_reg_start_tmp; /* from regexec.c */
601 MAGIC *re_state_reg_magic; /* from regexec.c */
602 PMOP *re_state_reg_oldcurpm; /* from regexec.c */
603 PMOP *re_state_reg_curpm; /* from regexec.c */
604 char *re_state_reg_oldsaved; /* old saved substr during match */
605 STRLEN re_state_reg_oldsavedlen; /* old length of saved substr during match */
606 STRLEN re_state_reg_poscache_size; /* size of pos cache of WHILEM */
607 I32 re_state_reg_oldpos; /* from regexec.c */
608 I32 re_state_reg_maxiter; /* max wait until caching pos */
609 I32 re_state_reg_leftiter; /* wait until caching pos */
610 U32 re_state_regsize; /* from regexec.c */
611 char *re_state_reg_poscache; /* cache of pos of WHILEM */
612 char *re_state_reg_starttry; /* from regexec.c */
613 #ifdef PERL_OLD_COPY_ON_WRITE
614 SV *re_state_nrs; /* was placeholder: unused since 5.8.0 (5.7.2 patch #12027 for bug ID 20010815.012). Used to save rx->saved_copy */
618 #define SAVESTACK_ALLOC_FOR_RE_SAVE_STATE \
619 (1 + ((sizeof(struct re_save_state) - 1) / sizeof(*PL_savestack)))
623 * c-indentation-style: bsd
625 * indent-tabs-mode: t
628 * ex: set ts=8 sts=4 sw=4 noet: