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os390 fixes (suggested by Peter Prymmer)
[perl5.git] / regcomp.c
CommitLineData
a0d0e21e
LW
1/* regcomp.c
2 */
3
4/*
5 * "A fair jaw-cracker dwarf-language must be." --Samwise Gamgee
6 */
7
a687059c
LW
8/* NOTE: this is derived from Henry Spencer's regexp code, and should not
9 * confused with the original package (see point 3 below). Thanks, Henry!
10 */
11
12/* Additional note: this code is very heavily munged from Henry's version
13 * in places. In some spots I've traded clarity for efficiency, so don't
14 * blame Henry for some of the lack of readability.
15 */
16
e50aee73
AD
17/* The names of the functions have been changed from regcomp and
18 * regexec to pregcomp and pregexec in order to avoid conflicts
19 * with the POSIX routines of the same names.
20*/
21
b9d5759e
AD
22#ifdef PERL_EXT_RE_BUILD
23/* need to replace pregcomp et al, so enable that */
24# ifndef PERL_IN_XSUB_RE
25# define PERL_IN_XSUB_RE
26# endif
27/* need access to debugger hooks */
28# ifndef DEBUGGING
29# define DEBUGGING
30# endif
31#endif
32
33#ifdef PERL_IN_XSUB_RE
d06ea78c 34/* We *really* need to overwrite these symbols: */
56953603
IZ
35# define Perl_pregcomp my_regcomp
36# define Perl_regdump my_regdump
37# define Perl_regprop my_regprop
d06ea78c
GS
38/* *These* symbols are masked to allow static link. */
39# define Perl_pregfree my_regfree
40# define Perl_regnext my_regnext
f0b8d043 41# define Perl_save_re_context my_save_re_context
56953603
IZ
42#endif
43
f0fcb552 44/*SUPPRESS 112*/
a687059c 45/*
e50aee73 46 * pregcomp and pregexec -- regsub and regerror are not used in perl
a687059c
LW
47 *
48 * Copyright (c) 1986 by University of Toronto.
49 * Written by Henry Spencer. Not derived from licensed software.
50 *
51 * Permission is granted to anyone to use this software for any
52 * purpose on any computer system, and to redistribute it freely,
53 * subject to the following restrictions:
54 *
55 * 1. The author is not responsible for the consequences of use of
56 * this software, no matter how awful, even if they arise
57 * from defects in it.
58 *
59 * 2. The origin of this software must not be misrepresented, either
60 * by explicit claim or by omission.
61 *
62 * 3. Altered versions must be plainly marked as such, and must not
63 * be misrepresented as being the original software.
64 *
65 *
66 **** Alterations to Henry's code are...
67 ****
a0ed51b3 68 **** Copyright (c) 1991-1998, Larry Wall
a687059c 69 ****
9ef589d8
LW
70 **** You may distribute under the terms of either the GNU General Public
71 **** License or the Artistic License, as specified in the README file.
72
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LW
73 *
74 * Beware that some of this code is subtly aware of the way operator
75 * precedence is structured in regular expressions. Serious changes in
76 * regular-expression syntax might require a total rethink.
77 */
78#include "EXTERN.h"
79#include "perl.h"
d06ea78c 80
b9d5759e 81#ifndef PERL_IN_XSUB_RE
d06ea78c
GS
82# include "INTERN.h"
83#endif
c277df42
IZ
84
85#define REG_COMP_C
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LW
86#include "regcomp.h"
87
d4cce5f1 88#ifdef op
11343788 89#undef op
d4cce5f1 90#endif /* op */
11343788 91
fe14fcc3
LW
92#ifdef MSDOS
93# if defined(BUGGY_MSC6)
94 /* MSC 6.00A breaks on op/regexp.t test 85 unless we turn this off */
95 # pragma optimize("a",off)
96 /* But MSC 6.00A is happy with 'w', for aliases only across function calls*/
97 # pragma optimize("w",on )
98# endif /* BUGGY_MSC6 */
99#endif /* MSDOS */
100
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LW
101#ifndef STATIC
102#define STATIC static
103#endif
104
105#define ISMULT1(c) ((c) == '*' || (c) == '+' || (c) == '?')
106#define ISMULT2(s) ((*s) == '*' || (*s) == '+' || (*s) == '?' || \
107 ((*s) == '{' && regcurly(s)))
2b69d0c2
LW
108#ifdef atarist
109#define PERL_META "^$.[()|?+*\\"
110#else
a687059c 111#define META "^$.[()|?+*\\"
2b69d0c2 112#endif
a687059c 113
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LW
114#ifdef SPSTART
115#undef SPSTART /* dratted cpp namespace... */
116#endif
a687059c
LW
117/*
118 * Flags to be passed up and down.
119 */
a687059c 120#define WORST 0 /* Worst case. */
821b33a5 121#define HASWIDTH 0x1 /* Known to match non-null strings. */
a0d0e21e
LW
122#define SIMPLE 0x2 /* Simple enough to be STAR/PLUS operand. */
123#define SPSTART 0x4 /* Starts with * or +. */
124#define TRYAGAIN 0x8 /* Weeded out a declaration. */
a687059c
LW
125
126/*
e50aee73 127 * Forward declarations for pregcomp()'s friends.
a687059c 128 */
a0d0e21e 129
76e3520e 130#ifndef PERL_OBJECT
c277df42
IZ
131static regnode *reg _((I32, I32 *));
132static regnode *reganode _((U8, U32));
133static regnode *regatom _((I32 *));
134static regnode *regbranch _((I32 *, I32));
135static void regc _((U8, char *));
a0ed51b3 136static void reguni _((UV, char *, I32*));
c277df42 137static regnode *regclass _((void));
a0ed51b3 138static regnode *regclassutf8 _((void));
a0d0e21e 139STATIC I32 regcurly _((char *));
c277df42
IZ
140static regnode *reg_node _((U8));
141static regnode *regpiece _((I32 *));
142static void reginsert _((U8, regnode *));
143static void regoptail _((regnode *, regnode *));
c277df42 144static void regtail _((regnode *, regnode *));
873ef191 145static char* regwhite _((char *, char *));
a0d0e21e 146static char* nextchar _((void));
3bd495df 147static void re_croak2 _((const char* pat1,const char* pat2,...)) __attribute__((noreturn));
76e3520e 148#endif
a687059c 149
c277df42
IZ
150/* Length of a variant. */
151
76e3520e 152#ifndef PERL_OBJECT
c277df42
IZ
153typedef struct {
154 I32 len_min;
155 I32 len_delta;
a0ed51b3
LW
156 I32 pos_min; /* CC */
157 I32 pos_delta; /* CC */
c277df42
IZ
158 SV *last_found;
159 I32 last_end; /* min value, <0 unless valid. */
a0ed51b3
LW
160 I32 last_start_min; /* CC */
161 I32 last_start_max; /* CC */
c277df42
IZ
162 SV **longest; /* Either &l_fixed, or &l_float. */
163 SV *longest_fixed;
a0ed51b3 164 I32 offset_fixed; /* CC */
c277df42 165 SV *longest_float;
a0ed51b3
LW
166 I32 offset_float_min; /* CC */
167 I32 offset_float_max; /* CC */
c277df42
IZ
168 I32 flags;
169} scan_data_t;
76e3520e 170#endif
c277df42
IZ
171
172static scan_data_t zero_scan_data = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
173
174#define SF_BEFORE_EOL (SF_BEFORE_SEOL|SF_BEFORE_MEOL)
175#define SF_BEFORE_SEOL 0x1
176#define SF_BEFORE_MEOL 0x2
177#define SF_FIX_BEFORE_EOL (SF_FIX_BEFORE_SEOL|SF_FIX_BEFORE_MEOL)
178#define SF_FL_BEFORE_EOL (SF_FL_BEFORE_SEOL|SF_FL_BEFORE_MEOL)
179
09b7f37c
CB
180#ifdef NO_UNARY_PLUS
181# define SF_FIX_SHIFT_EOL (0+2)
182# define SF_FL_SHIFT_EOL (0+4)
183#else
184# define SF_FIX_SHIFT_EOL (+2)
185# define SF_FL_SHIFT_EOL (+4)
186#endif
c277df42
IZ
187
188#define SF_FIX_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FIX_SHIFT_EOL)
189#define SF_FIX_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FIX_SHIFT_EOL)
190
191#define SF_FL_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FL_SHIFT_EOL)
192#define SF_FL_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FL_SHIFT_EOL) /* 0x20 */
193#define SF_IS_INF 0x40
194#define SF_HAS_PAR 0x80
195#define SF_IN_PAR 0x100
196#define SF_HAS_EVAL 0x200
4bfe0158 197#define SCF_DO_SUBSTR 0x400
c277df42 198
a0ed51b3
LW
199#define RF_utf8 8
200#define UTF (PL_reg_flags & RF_utf8)
201#define LOC (PL_regflags & PMf_LOCALE)
202#define FOLD (PL_regflags & PMf_FOLD)
203
204#define CHR_SVLEN(sv) (UTF ? sv_len_utf8(sv) : SvCUR(sv))
205#define CHR_DIST(a,b) (UTF ? utf8_distance(a,b) : a - b)
206
76e3520e 207STATIC void
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IZ
208scan_commit(scan_data_t *data)
209{
c485e607 210 dTHR;
a0ed51b3
LW
211 STRLEN l = CHR_SVLEN(data->last_found);
212 STRLEN old_l = CHR_SVLEN(*data->longest);
c277df42
IZ
213
214 if ((l >= old_l) && ((l > old_l) || (data->flags & SF_BEFORE_EOL))) {
215 sv_setsv(*data->longest, data->last_found);
216 if (*data->longest == data->longest_fixed) {
217 data->offset_fixed = l ? data->last_start_min : data->pos_min;
218 if (data->flags & SF_BEFORE_EOL)
219 data->flags
220 |= ((data->flags & SF_BEFORE_EOL) << SF_FIX_SHIFT_EOL);
221 else
222 data->flags &= ~SF_FIX_BEFORE_EOL;
a0ed51b3
LW
223 }
224 else {
c277df42
IZ
225 data->offset_float_min = l ? data->last_start_min : data->pos_min;
226 data->offset_float_max = (l
227 ? data->last_start_max
228 : data->pos_min + data->pos_delta);
229 if (data->flags & SF_BEFORE_EOL)
230 data->flags
231 |= ((data->flags & SF_BEFORE_EOL) << SF_FL_SHIFT_EOL);
232 else
233 data->flags &= ~SF_FL_BEFORE_EOL;
234 }
235 }
236 SvCUR_set(data->last_found, 0);
237 data->last_end = -1;
238 data->flags &= ~SF_BEFORE_EOL;
239}
240
c277df42
IZ
241/* Stops at toplevel WHILEM as well as at `last'. At end *scanp is set
242 to the position after last scanned or to NULL. */
243
76e3520e 244STATIC I32
c277df42
IZ
245study_chunk(regnode **scanp, I32 *deltap, regnode *last, scan_data_t *data, U32 flags)
246 /* scanp: Start here (read-write). */
247 /* deltap: Write maxlen-minlen here. */
248 /* last: Stop before this one. */
249{
5c0ca799 250 dTHR;
c277df42
IZ
251 I32 min = 0, pars = 0, code;
252 regnode *scan = *scanp, *next;
253 I32 delta = 0;
254 int is_inf = (flags & SCF_DO_SUBSTR) && (data->flags & SF_IS_INF);
aca2d497 255 int is_inf_internal = 0; /* The studied chunk is infinite */
c277df42
IZ
256 I32 is_par = OP(scan) == OPEN ? ARG(scan) : 0;
257 scan_data_t data_fake;
258
259 while (scan && OP(scan) != END && scan < last) {
260 /* Peephole optimizer: */
261
262 if (regkind[(U8)OP(scan)] == EXACT) {
263 regnode *n = regnext(scan);
264 U32 stringok = 1;
265#ifdef DEBUGGING
266 regnode *stop = scan;
267#endif
268
269 next = scan + (*OPERAND(scan) + 2 - 1)/sizeof(regnode) + 2;
270 /* Skip NOTHING, merge EXACT*. */
271 while (n &&
272 ( regkind[(U8)OP(n)] == NOTHING ||
273 (stringok && (OP(n) == OP(scan))))
274 && NEXT_OFF(n)
275 && NEXT_OFF(scan) + NEXT_OFF(n) < I16_MAX) {
276 if (OP(n) == TAIL || n > next)
277 stringok = 0;
278 if (regkind[(U8)OP(n)] == NOTHING) {
279 NEXT_OFF(scan) += NEXT_OFF(n);
280 next = n + NODE_STEP_REGNODE;
281#ifdef DEBUGGING
282 if (stringok)
283 stop = n;
284#endif
285 n = regnext(n);
a0ed51b3
LW
286 }
287 else {
c277df42
IZ
288 int oldl = *OPERAND(scan);
289 regnode *nnext = regnext(n);
290
291 if (oldl + *OPERAND(n) > U8_MAX)
292 break;
293 NEXT_OFF(scan) += NEXT_OFF(n);
294 *OPERAND(scan) += *OPERAND(n);
295 next = n + (*OPERAND(n) + 2 - 1)/sizeof(regnode) + 2;
296 /* Now we can overwrite *n : */
297 Move(OPERAND(n) + 1, OPERAND(scan) + oldl + 1,
298 *OPERAND(n) + 1, char);
299#ifdef DEBUGGING
300 if (stringok)
301 stop = next - 1;
302#endif
303 n = nnext;
304 }
305 }
306#ifdef DEBUGGING
307 /* Allow dumping */
308 n = scan + (*OPERAND(scan) + 2 - 1)/sizeof(regnode) + 2;
309 while (n <= stop) {
ca04da08
GS
310 /* Purify reports a benign UMR here sometimes, because we
311 * don't initialize the OP() slot of a node when that node
312 * is occupied by just the trailing null of the string in
313 * an EXACT node */
c277df42
IZ
314 if (regkind[(U8)OP(n)] != NOTHING || OP(n) == NOTHING) {
315 OP(n) = OPTIMIZED;
316 NEXT_OFF(n) = 0;
317 }
318 n++;
319 }
320#endif
321
322 }
323 if (OP(scan) != CURLYX) {
048cfca1
GS
324 int max = (reg_off_by_arg[OP(scan)]
325 ? I32_MAX
326 /* I32 may be smaller than U16 on CRAYs! */
327 : (I32_MAX < U16_MAX ? I32_MAX : U16_MAX));
c277df42
IZ
328 int off = (reg_off_by_arg[OP(scan)] ? ARG(scan) : NEXT_OFF(scan));
329 int noff;
330 regnode *n = scan;
331
332 /* Skip NOTHING and LONGJMP. */
333 while ((n = regnext(n))
334 && ((regkind[(U8)OP(n)] == NOTHING && (noff = NEXT_OFF(n)))
335 || ((OP(n) == LONGJMP) && (noff = ARG(n))))
336 && off + noff < max)
337 off += noff;
338 if (reg_off_by_arg[OP(scan)])
339 ARG(scan) = off;
340 else
341 NEXT_OFF(scan) = off;
342 }
343 if (OP(scan) == BRANCH || OP(scan) == BRANCHJ
344 || OP(scan) == IFTHEN || OP(scan) == SUSPEND) {
345 next = regnext(scan);
346 code = OP(scan);
347
348 if (OP(next) == code || code == IFTHEN || code == SUSPEND) {
349 I32 max1 = 0, min1 = I32_MAX, num = 0;
350
351 if (flags & SCF_DO_SUBSTR)
352 scan_commit(data);
353 while (OP(scan) == code) {
354 I32 deltanext, minnext;
355
356 num++;
357 data_fake.flags = 0;
358 next = regnext(scan);
359 scan = NEXTOPER(scan);
360 if (code != BRANCH)
361 scan = NEXTOPER(scan);
362 /* We suppose the run is continuous, last=next...*/
363 minnext = study_chunk(&scan, &deltanext, next,
364 &data_fake, 0);
365 if (min1 > minnext)
366 min1 = minnext;
367 if (max1 < minnext + deltanext)
368 max1 = minnext + deltanext;
369 if (deltanext == I32_MAX)
aca2d497 370 is_inf = is_inf_internal = 1;
c277df42
IZ
371 scan = next;
372 if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
373 pars++;
405ff068 374 if (data && (data_fake.flags & SF_HAS_EVAL))
c277df42
IZ
375 data->flags |= SF_HAS_EVAL;
376 if (code == SUSPEND)
377 break;
378 }
379 if (code == IFTHEN && num < 2) /* Empty ELSE branch */
380 min1 = 0;
381 if (flags & SCF_DO_SUBSTR) {
382 data->pos_min += min1;
383 data->pos_delta += max1 - min1;
384 if (max1 != min1 || is_inf)
385 data->longest = &(data->longest_float);
386 }
387 min += min1;
388 delta += max1 - min1;
a0ed51b3
LW
389 }
390 else if (code == BRANCHJ) /* single branch is optimized. */
c277df42
IZ
391 scan = NEXTOPER(NEXTOPER(scan));
392 else /* single branch is optimized. */
393 scan = NEXTOPER(scan);
394 continue;
a0ed51b3
LW
395 }
396 else if (OP(scan) == EXACT) {
397 I32 l = *OPERAND(scan);
398 if (UTF) {
399 unsigned char *s = (unsigned char *)(OPERAND(scan)+1);
400 unsigned char *e = s + l;
401 I32 newl = 0;
402 while (s < e) {
403 newl++;
404 s += UTF8SKIP(s);
405 }
406 l = newl;
407 }
408 min += l;
c277df42 409 if (flags & SCF_DO_SUBSTR) { /* Update longest substr. */
c277df42
IZ
410 /* The code below prefers earlier match for fixed
411 offset, later match for variable offset. */
412 if (data->last_end == -1) { /* Update the start info. */
413 data->last_start_min = data->pos_min;
414 data->last_start_max = is_inf
415 ? I32_MAX : data->pos_min + data->pos_delta;
416 }
a0ed51b3 417 sv_catpvn(data->last_found, (char *)(OPERAND(scan)+1), *OPERAND(scan));
c277df42
IZ
418 data->last_end = data->pos_min + l;
419 data->pos_min += l; /* As in the first entry. */
420 data->flags &= ~SF_BEFORE_EOL;
421 }
a0ed51b3
LW
422 }
423 else if (regkind[(U8)OP(scan)] == EXACT) {
424 I32 l = *OPERAND(scan);
c277df42
IZ
425 if (flags & SCF_DO_SUBSTR)
426 scan_commit(data);
a0ed51b3
LW
427 if (UTF) {
428 unsigned char *s = (unsigned char *)(OPERAND(scan)+1);
429 unsigned char *e = s + l;
430 I32 newl = 0;
431 while (s < e) {
432 newl++;
433 s += UTF8SKIP(s);
434 }
435 l = newl;
436 }
437 min += l;
c277df42 438 if (data && (flags & SCF_DO_SUBSTR))
a0ed51b3
LW
439 data->pos_min += l;
440 }
441 else if (strchr(varies,OP(scan))) {
c277df42
IZ
442 I32 mincount, maxcount, minnext, deltanext, pos_before, fl;
443 regnode *oscan = scan;
444
445 switch (regkind[(U8)OP(scan)]) {
446 case WHILEM:
447 scan = NEXTOPER(scan);
448 goto finish;
449 case PLUS:
450 if (flags & SCF_DO_SUBSTR) {
451 next = NEXTOPER(scan);
452 if (OP(next) == EXACT) {
453 mincount = 1;
454 maxcount = REG_INFTY;
455 next = regnext(scan);
456 scan = NEXTOPER(scan);
457 goto do_curly;
458 }
459 }
460 if (flags & SCF_DO_SUBSTR)
461 data->pos_min++;
462 min++;
463 /* Fall through. */
464 case STAR:
aca2d497 465 is_inf = is_inf_internal = 1;
c277df42
IZ
466 scan = regnext(scan);
467 if (flags & SCF_DO_SUBSTR) {
468 scan_commit(data);
469 data->longest = &(data->longest_float);
470 }
471 goto optimize_curly_tail;
472 case CURLY:
473 mincount = ARG1(scan);
474 maxcount = ARG2(scan);
475 next = regnext(scan);
476 scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS;
477 do_curly:
478 if (flags & SCF_DO_SUBSTR) {
479 if (mincount == 0) scan_commit(data);
480 pos_before = data->pos_min;
481 }
482 if (data) {
483 fl = data->flags;
484 data->flags &= ~(SF_HAS_PAR|SF_IN_PAR|SF_HAS_EVAL);
485 if (is_inf)
486 data->flags |= SF_IS_INF;
487 }
488 /* This will finish on WHILEM, setting scan, or on NULL: */
489 minnext = study_chunk(&scan, &deltanext, last, data,
490 mincount == 0
491 ? (flags & ~SCF_DO_SUBSTR) : flags);
492 if (!scan) /* It was not CURLYX, but CURLY. */
493 scan = next;
599cee73 494 if (ckWARN(WARN_UNSAFE) && (minnext + deltanext == 0)
821b33a5 495 && !(data->flags & (SF_HAS_PAR|SF_IN_PAR))
17feb5d5 496 && maxcount <= REG_INFTY/3) /* Complement check for big count */
599cee73 497 warner(WARN_UNSAFE, "Strange *+?{} on zero-length expression");
c277df42 498 min += minnext * mincount;
aca2d497
IZ
499 is_inf_internal |= (maxcount == REG_INFTY
500 && (minnext + deltanext) > 0
501 || deltanext == I32_MAX);
502 is_inf |= is_inf_internal;
c277df42
IZ
503 delta += (minnext + deltanext) * maxcount - minnext * mincount;
504
505 /* Try powerful optimization CURLYX => CURLYN. */
c277df42
IZ
506 if ( OP(oscan) == CURLYX && data
507 && data->flags & SF_IN_PAR
508 && !(data->flags & SF_HAS_EVAL)
509 && !deltanext && minnext == 1 ) {
510 /* Try to optimize to CURLYN. */
511 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS;
512 regnode *nxt1 = nxt, *nxt2;
513
514 /* Skip open. */
515 nxt = regnext(nxt);
516 if (!strchr(simple,OP(nxt))
517 && !(regkind[(U8)OP(nxt)] == EXACT
518 && *OPERAND(nxt) == 1))
519 goto nogo;
520 nxt2 = nxt;
521 nxt = regnext(nxt);
522 if (OP(nxt) != CLOSE)
523 goto nogo;
524 /* Now we know that nxt2 is the only contents: */
525 oscan->flags = ARG(nxt);
526 OP(oscan) = CURLYN;
527 OP(nxt1) = NOTHING; /* was OPEN. */
528#ifdef DEBUGGING
529 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
530 NEXT_OFF(nxt1+ 1) = 0; /* just for consistancy. */
531 NEXT_OFF(nxt2) = 0; /* just for consistancy with CURLY. */
532 OP(nxt) = OPTIMIZED; /* was CLOSE. */
533 OP(nxt + 1) = OPTIMIZED; /* was count. */
534 NEXT_OFF(nxt+ 1) = 0; /* just for consistancy. */
535#endif
536 }
c277df42
IZ
537 nogo:
538
539 /* Try optimization CURLYX => CURLYM. */
540 if ( OP(oscan) == CURLYX && data
c277df42 541 && !(data->flags & SF_HAS_PAR)
c277df42
IZ
542 && !(data->flags & SF_HAS_EVAL)
543 && !deltanext ) {
544 /* XXXX How to optimize if data == 0? */
545 /* Optimize to a simpler form. */
546 regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN */
547 regnode *nxt2;
548
549 OP(oscan) = CURLYM;
550 while ( (nxt2 = regnext(nxt)) /* skip over embedded stuff*/
551 && (OP(nxt2) != WHILEM))
552 nxt = nxt2;
553 OP(nxt2) = SUCCEED; /* Whas WHILEM */
c277df42
IZ
554 /* Need to optimize away parenths. */
555 if (data->flags & SF_IN_PAR) {
556 /* Set the parenth number. */
557 regnode *nxt1 = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN*/
558
559 if (OP(nxt) != CLOSE)
560 FAIL("panic opt close");
561 oscan->flags = ARG(nxt);
562 OP(nxt1) = OPTIMIZED; /* was OPEN. */
563 OP(nxt) = OPTIMIZED; /* was CLOSE. */
564#ifdef DEBUGGING
565 OP(nxt1 + 1) = OPTIMIZED; /* was count. */
566 OP(nxt + 1) = OPTIMIZED; /* was count. */
567 NEXT_OFF(nxt1 + 1) = 0; /* just for consistancy. */
568 NEXT_OFF(nxt + 1) = 0; /* just for consistancy. */
569#endif
570#if 0
571 while ( nxt1 && (OP(nxt1) != WHILEM)) {
572 regnode *nnxt = regnext(nxt1);
573
574 if (nnxt == nxt) {
575 if (reg_off_by_arg[OP(nxt1)])
576 ARG_SET(nxt1, nxt2 - nxt1);
577 else if (nxt2 - nxt1 < U16_MAX)
578 NEXT_OFF(nxt1) = nxt2 - nxt1;
579 else
580 OP(nxt) = NOTHING; /* Cannot beautify */
581 }
582 nxt1 = nnxt;
583 }
584#endif
585 /* Optimize again: */
586 study_chunk(&nxt1, &deltanext, nxt, NULL, 0);
a0ed51b3
LW
587 }
588 else
c277df42 589 oscan->flags = 0;
c277df42
IZ
590 }
591 if (data && fl & (SF_HAS_PAR|SF_IN_PAR))
592 pars++;
593 if (flags & SCF_DO_SUBSTR) {
594 SV *last_str = Nullsv;
595 int counted = mincount != 0;
596
597 if (data->last_end > 0 && mincount != 0) { /* Ends with a string. */
598 I32 b = pos_before >= data->last_start_min
599 ? pos_before : data->last_start_min;
600 STRLEN l;
601 char *s = SvPV(data->last_found, l);
a0ed51b3
LW
602 I32 old = b - data->last_start_min;
603
604 if (UTF)
605 old = utf8_hop((U8*)s, old) - (U8*)s;
c277df42 606
a0ed51b3 607 l -= old;
c277df42 608 /* Get the added string: */
a0ed51b3 609 last_str = newSVpv(s + old, l);
c277df42
IZ
610 if (deltanext == 0 && pos_before == b) {
611 /* What was added is a constant string */
612 if (mincount > 1) {
613 SvGROW(last_str, (mincount * l) + 1);
614 repeatcpy(SvPVX(last_str) + l,
615 SvPVX(last_str), l, mincount - 1);
616 SvCUR(last_str) *= mincount;
617 /* Add additional parts. */
618 SvCUR_set(data->last_found,
619 SvCUR(data->last_found) - l);
620 sv_catsv(data->last_found, last_str);
621 data->last_end += l * (mincount - 1);
622 }
623 }
624 }
625 /* It is counted once already... */
626 data->pos_min += minnext * (mincount - counted);
627 data->pos_delta += - counted * deltanext +
628 (minnext + deltanext) * maxcount - minnext * mincount;
629 if (mincount != maxcount) {
630 scan_commit(data);
631 if (mincount && last_str) {
632 sv_setsv(data->last_found, last_str);
633 data->last_end = data->pos_min;
634 data->last_start_min =
a0ed51b3 635 data->pos_min - CHR_SVLEN(last_str);
c277df42
IZ
636 data->last_start_max = is_inf
637 ? I32_MAX
638 : data->pos_min + data->pos_delta
a0ed51b3 639 - CHR_SVLEN(last_str);
c277df42
IZ
640 }
641 data->longest = &(data->longest_float);
642 }
aca2d497 643 SvREFCNT_dec(last_str);
c277df42 644 }
405ff068 645 if (data && (fl & SF_HAS_EVAL))
c277df42
IZ
646 data->flags |= SF_HAS_EVAL;
647 optimize_curly_tail:
c277df42
IZ
648 if (OP(oscan) != CURLYX) {
649 while (regkind[(U8)OP(next = regnext(oscan))] == NOTHING
650 && NEXT_OFF(next))
651 NEXT_OFF(oscan) += NEXT_OFF(next);
652 }
c277df42
IZ
653 continue;
654 default: /* REF only? */
655 if (flags & SCF_DO_SUBSTR) {
656 scan_commit(data);
657 data->longest = &(data->longest_float);
658 }
aca2d497 659 is_inf = is_inf_internal = 1;
c277df42
IZ
660 break;
661 }
a0ed51b3
LW
662 }
663 else if (strchr(simple,OP(scan)) || regkind[(U8)OP(scan)] == ANYUTF8) {
c277df42
IZ
664 if (flags & SCF_DO_SUBSTR) {
665 scan_commit(data);
666 data->pos_min++;
667 }
668 min++;
a0ed51b3
LW
669 }
670 else if (regkind[(U8)OP(scan)] == EOL && flags & SCF_DO_SUBSTR) {
c277df42
IZ
671 data->flags |= (OP(scan) == MEOL
672 ? SF_BEFORE_MEOL
673 : SF_BEFORE_SEOL);
a0ed51b3
LW
674 }
675 else if (regkind[(U8)OP(scan)] == BRANCHJ
c277df42
IZ
676 && (scan->flags || data)
677 && (OP(scan) == IFMATCH || OP(scan) == UNLESSM)) {
678 I32 deltanext, minnext;
679 regnode *nscan;
680
681 data_fake.flags = 0;
682 next = regnext(scan);
683 nscan = NEXTOPER(NEXTOPER(scan));
684 minnext = study_chunk(&nscan, &deltanext, last, &data_fake, 0);
685 if (scan->flags) {
686 if (deltanext) {
687 FAIL("variable length lookbehind not implemented");
a0ed51b3
LW
688 }
689 else if (minnext > U8_MAX) {
c277df42
IZ
690 FAIL2("lookbehind longer than %d not implemented", U8_MAX);
691 }
692 scan->flags = minnext;
693 }
694 if (data && data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
695 pars++;
405ff068 696 if (data && (data_fake.flags & SF_HAS_EVAL))
c277df42 697 data->flags |= SF_HAS_EVAL;
a0ed51b3
LW
698 }
699 else if (OP(scan) == OPEN) {
c277df42 700 pars++;
a0ed51b3
LW
701 }
702 else if (OP(scan) == CLOSE && ARG(scan) == is_par) {
c277df42
IZ
703 next = regnext(scan);
704
705 if ( next && (OP(next) != WHILEM) && next < last)
c277df42 706 is_par = 0; /* Disable optimization */
a0ed51b3
LW
707 }
708 else if (OP(scan) == EVAL) {
c277df42
IZ
709 if (data)
710 data->flags |= SF_HAS_EVAL;
711 }
0f5d15d6
IZ
712 else if (OP(scan) == LOGICAL && scan->flags == 2) { /* Embedded */
713 if (flags & SCF_DO_SUBSTR) {
714 scan_commit(data);
715 data->longest = &(data->longest_float);
716 }
717 is_inf = is_inf_internal = 1;
718 }
c277df42
IZ
719 /* Else: zero-length, ignore. */
720 scan = regnext(scan);
721 }
722
723 finish:
724 *scanp = scan;
aca2d497 725 *deltap = is_inf_internal ? I32_MAX : delta;
c277df42
IZ
726 if (flags & SCF_DO_SUBSTR && is_inf)
727 data->pos_delta = I32_MAX - data->pos_min;
728 if (is_par > U8_MAX)
729 is_par = 0;
730 if (is_par && pars==1 && data) {
731 data->flags |= SF_IN_PAR;
732 data->flags &= ~SF_HAS_PAR;
a0ed51b3
LW
733 }
734 else if (pars && data) {
c277df42
IZ
735 data->flags |= SF_HAS_PAR;
736 data->flags &= ~SF_IN_PAR;
737 }
738 return min;
739}
740
76e3520e 741STATIC I32
c277df42
IZ
742add_data(I32 n, char *s)
743{
5c0ca799 744 dTHR;
3280af22
NIS
745 if (PL_regcomp_rx->data) {
746 Renewc(PL_regcomp_rx->data,
747 sizeof(*PL_regcomp_rx->data) + sizeof(void*) * (PL_regcomp_rx->data->count + n - 1),
c277df42 748 char, struct reg_data);
3280af22
NIS
749 Renew(PL_regcomp_rx->data->what, PL_regcomp_rx->data->count + n, U8);
750 PL_regcomp_rx->data->count += n;
a0ed51b3
LW
751 }
752 else {
3280af22 753 Newc(1207, PL_regcomp_rx->data, sizeof(*PL_regcomp_rx->data) + sizeof(void*) * (n - 1),
c277df42 754 char, struct reg_data);
3280af22
NIS
755 New(1208, PL_regcomp_rx->data->what, n, U8);
756 PL_regcomp_rx->data->count = n;
c277df42 757 }
3280af22
NIS
758 Copy(s, PL_regcomp_rx->data->what + PL_regcomp_rx->data->count - n, n, U8);
759 return PL_regcomp_rx->data->count - n;
c277df42
IZ
760}
761
a687059c 762/*
e50aee73 763 - pregcomp - compile a regular expression into internal code
a687059c
LW
764 *
765 * We can't allocate space until we know how big the compiled form will be,
766 * but we can't compile it (and thus know how big it is) until we've got a
767 * place to put the code. So we cheat: we compile it twice, once with code
768 * generation turned off and size counting turned on, and once "for real".
769 * This also means that we don't allocate space until we are sure that the
770 * thing really will compile successfully, and we never have to move the
771 * code and thus invalidate pointers into it. (Note that it has to be in
772 * one piece because free() must be able to free it all.) [NB: not true in perl]
773 *
774 * Beware that the optimization-preparation code in here knows about some
775 * of the structure of the compiled regexp. [I'll say.]
776 */
777regexp *
8ac85365 778pregcomp(char *exp, char *xend, PMOP *pm)
a687059c 779{
5c0ca799 780 dTHR;
a0d0e21e 781 register regexp *r;
c277df42
IZ
782 regnode *scan;
783 SV **longest;
784 SV *longest_fixed;
785 SV *longest_float;
786 regnode *first;
a0d0e21e 787 I32 flags;
a0d0e21e
LW
788 I32 minlen = 0;
789 I32 sawplus = 0;
790 I32 sawopen = 0;
791
792 if (exp == NULL)
c277df42 793 FAIL("NULL regexp argument");
a0d0e21e 794
a0ed51b3
LW
795 if (PL_curcop == &compiling ? (PL_hints & HINT_UTF8) : IN_UTF8)
796 PL_reg_flags |= RF_utf8;
797 else
798 PL_reg_flags = 0;
799
3280af22 800 PL_regprecomp = savepvn(exp, xend - exp);
8d300b32
GS
801 DEBUG_r(
802 if (!PL_colorset) {
803 int i = 0;
804 char *s = PerlEnv_getenv("PERL_RE_COLORS");
805
806 if (s) {
807 PL_colors[0] = s = savepv(s);
808 while (++i < 6) {
809 s = strchr(s, '\t');
810 if (s) {
811 *s = '\0';
812 PL_colors[i] = ++s;
813 }
814 else
815 PL_colors[i] = "";
816 }
817 } else {
818 while (i < 6)
819 PL_colors[i++] = "";
820 }
821 PL_colorset = 1;
822 }
823 );
824 DEBUG_r(PerlIO_printf(Perl_debug_log, "%sCompiling%s RE `%s%*s%s'\n",
825 PL_colors[4],PL_colors[5],PL_colors[0],
826 xend - exp, PL_regprecomp, PL_colors[1]));
3280af22
NIS
827 PL_regflags = pm->op_pmflags;
828 PL_regsawback = 0;
bbce6d69 829
3280af22
NIS
830 PL_regseen = 0;
831 PL_seen_zerolen = *exp == '^' ? -1 : 0;
832 PL_seen_evals = 0;
833 PL_extralen = 0;
c277df42 834
bbce6d69 835 /* First pass: determine size, legality. */
3280af22
NIS
836 PL_regcomp_parse = exp;
837 PL_regxend = xend;
838 PL_regnaughty = 0;
839 PL_regnpar = 1;
840 PL_regsize = 0L;
841 PL_regcode = &PL_regdummy;
842 regc((U8)MAGIC, (char*)PL_regcode);
a0d0e21e 843 if (reg(0, &flags) == NULL) {
3280af22
NIS
844 Safefree(PL_regprecomp);
845 PL_regprecomp = Nullch;
a0d0e21e
LW
846 return(NULL);
847 }
3280af22 848 DEBUG_r(PerlIO_printf(Perl_debug_log, "size %d ", PL_regsize));
c277df42 849
c277df42
IZ
850 /* Small enough for pointer-storage convention?
851 If extralen==0, this means that we will not need long jumps. */
3280af22
NIS
852 if (PL_regsize >= 0x10000L && PL_extralen)
853 PL_regsize += PL_extralen;
c277df42 854 else
3280af22 855 PL_extralen = 0;
a0d0e21e 856
bbce6d69 857 /* Allocate space and initialize. */
3280af22 858 Newc(1001, r, sizeof(regexp) + (unsigned)PL_regsize * sizeof(regnode),
c277df42 859 char, regexp);
a0d0e21e
LW
860 if (r == NULL)
861 FAIL("regexp out of space");
c277df42 862 r->refcnt = 1;
bbce6d69 863 r->prelen = xend - exp;
3280af22 864 r->precomp = PL_regprecomp;
a0d0e21e 865 r->subbeg = r->subbase = NULL;
3280af22
NIS
866 r->nparens = PL_regnpar - 1; /* set early to validate backrefs */
867 PL_regcomp_rx = r;
bbce6d69
PP
868
869 /* Second pass: emit code. */
3280af22
NIS
870 PL_regcomp_parse = exp;
871 PL_regxend = xend;
872 PL_regnaughty = 0;
873 PL_regnpar = 1;
874 PL_regcode = r->program;
2cd61cdb 875 /* Store the count of eval-groups for security checks: */
3280af22
NIS
876 PL_regcode->next_off = ((PL_seen_evals > U16_MAX) ? U16_MAX : PL_seen_evals);
877 regc((U8)MAGIC, (char*) PL_regcode++);
c277df42 878 r->data = 0;
a0d0e21e
LW
879 if (reg(0, &flags) == NULL)
880 return(NULL);
881
882 /* Dig out information for optimizations. */
8782bef2 883 r->reganch = pm->op_pmflags & PMf_COMPILETIME;
3280af22 884 pm->op_pmflags = PL_regflags;
a0ed51b3
LW
885 if (UTF)
886 r->reganch |= ROPT_UTF8;
c277df42 887 r->regstclass = NULL;
a0ed51b3
LW
888 if (PL_regnaughty >= 10) /* Probably an expensive pattern. */
889 r->reganch |= ROPT_NAUGHTY;
c277df42 890 scan = r->program + 1; /* First BRANCH. */
2779dcf1
IZ
891
892 /* XXXX To minimize changes to RE engine we always allocate
893 3-units-long substrs field. */
894 Newz(1004, r->substrs, 1, struct reg_substr_data);
895
c277df42
IZ
896 if (OP(scan) != BRANCH) { /* Only one top-level choice. */
897 scan_data_t data;
898 I32 fake;
c5254dd6 899 STRLEN longest_float_length, longest_fixed_length;
a0d0e21e 900
c277df42 901 StructCopy(&zero_scan_data, &data, scan_data_t);
a0d0e21e 902 first = scan;
c277df42 903 /* Skip introductions and multiplicators >= 1. */
a0d0e21e
LW
904 while ((OP(first) == OPEN && (sawopen = 1)) ||
905 (OP(first) == BRANCH && OP(regnext(first)) != BRANCH) ||
906 (OP(first) == PLUS) ||
907 (OP(first) == MINMOD) ||
908 (regkind[(U8)OP(first)] == CURLY && ARG1(first) > 0) ) {
909 if (OP(first) == PLUS)
910 sawplus = 1;
911 else
912 first += regarglen[(U8)OP(first)];
913 first = NEXTOPER(first);
a687059c
LW
914 }
915
a0d0e21e
LW
916 /* Starting-point info. */
917 again:
c277df42 918 if (OP(first) == EXACT); /* Empty, get anchored substr later. */
a0ed51b3 919 else if (strchr(simple+4,OP(first)))
a0d0e21e 920 r->regstclass = first;
bbce6d69
PP
921 else if (regkind[(U8)OP(first)] == BOUND ||
922 regkind[(U8)OP(first)] == NBOUND)
a0d0e21e
LW
923 r->regstclass = first;
924 else if (regkind[(U8)OP(first)] == BOL) {
c277df42 925 r->reganch |= (OP(first) == MBOL ? ROPT_ANCH_MBOL: ROPT_ANCH_BOL);
a0d0e21e 926 first = NEXTOPER(first);
774d564b
PP
927 goto again;
928 }
929 else if (OP(first) == GPOS) {
930 r->reganch |= ROPT_ANCH_GPOS;
931 first = NEXTOPER(first);
932 goto again;
a0d0e21e
LW
933 }
934 else if ((OP(first) == STAR &&
935 regkind[(U8)OP(NEXTOPER(first))] == ANY) &&
936 !(r->reganch & ROPT_ANCH) )
937 {
938 /* turn .* into ^.* with an implied $*=1 */
774d564b 939 r->reganch |= ROPT_ANCH_BOL | ROPT_IMPLICIT;
a0d0e21e 940 first = NEXTOPER(first);
774d564b 941 goto again;
a0d0e21e 942 }
3280af22 943 if (sawplus && (!sawopen || !PL_regsawback))
a0d0e21e
LW
944 r->reganch |= ROPT_SKIP; /* x+ must match 1st of run */
945
c277df42
IZ
946 /* Scan is after the zeroth branch, first is atomic matcher. */
947 DEBUG_r(PerlIO_printf(Perl_debug_log, "first at %d\n",
948 first - scan + 1));
a0d0e21e
LW
949 /*
950 * If there's something expensive in the r.e., find the
951 * longest literal string that must appear and make it the
952 * regmust. Resolve ties in favor of later strings, since
953 * the regstart check works with the beginning of the r.e.
954 * and avoiding duplication strengthens checking. Not a
955 * strong reason, but sufficient in the absence of others.
956 * [Now we resolve ties in favor of the earlier string if
c277df42 957 * it happens that c_offset_min has been invalidated, since the
a0d0e21e
LW
958 * earlier string may buy us something the later one won't.]
959 */
a0d0e21e 960 minlen = 0;
a687059c 961
c277df42
IZ
962 data.longest_fixed = newSVpv("",0);
963 data.longest_float = newSVpv("",0);
964 data.last_found = newSVpv("",0);
965 data.longest = &(data.longest_fixed);
966 first = scan;
967
3280af22 968 minlen = study_chunk(&first, &fake, scan + PL_regsize, /* Up to end */
c277df42 969 &data, SCF_DO_SUBSTR);
3280af22 970 if ( PL_regnpar == 1 && data.longest == &(data.longest_fixed)
c277df42 971 && data.last_start_min == 0 && data.last_end > 0
3280af22
NIS
972 && !PL_seen_zerolen
973 && (!(PL_regseen & REG_SEEN_GPOS) || (r->reganch & ROPT_ANCH_GPOS)))
c277df42
IZ
974 r->reganch |= ROPT_CHECK_ALL;
975 scan_commit(&data);
976 SvREFCNT_dec(data.last_found);
977
a0ed51b3 978 longest_float_length = CHR_SVLEN(data.longest_float);
c5254dd6 979 if (longest_float_length
c277df42
IZ
980 || (data.flags & SF_FL_BEFORE_EOL
981 && (!(data.flags & SF_FL_BEFORE_MEOL)
3280af22 982 || (PL_regflags & PMf_MULTILINE)))) {
a0ed51b3 983 if (SvCUR(data.longest_fixed) /* ok to leave SvCUR */
aca2d497
IZ
984 && data.offset_fixed == data.offset_float_min
985 && SvCUR(data.longest_fixed) == SvCUR(data.longest_float))
986 goto remove_float; /* As in (a)+. */
987
c277df42
IZ
988 r->float_substr = data.longest_float;
989 r->float_min_offset = data.offset_float_min;
990 r->float_max_offset = data.offset_float_max;
2779dcf1 991 fbm_compile(r->float_substr, 0);
c277df42
IZ
992 BmUSEFUL(r->float_substr) = 100;
993 if (data.flags & SF_FL_BEFORE_EOL /* Cannot have SEOL and MULTI */
994 && (!(data.flags & SF_FL_BEFORE_MEOL)
3280af22 995 || (PL_regflags & PMf_MULTILINE)))
c277df42 996 SvTAIL_on(r->float_substr);
a0ed51b3
LW
997 }
998 else {
aca2d497 999 remove_float:
c277df42
IZ
1000 r->float_substr = Nullsv;
1001 SvREFCNT_dec(data.longest_float);
c5254dd6 1002 longest_float_length = 0;
a0d0e21e 1003 }
c277df42 1004
a0ed51b3 1005 longest_fixed_length = CHR_SVLEN(data.longest_fixed);
c5254dd6 1006 if (longest_fixed_length
c277df42
IZ
1007 || (data.flags & SF_FIX_BEFORE_EOL /* Cannot have SEOL and MULTI */
1008 && (!(data.flags & SF_FIX_BEFORE_MEOL)
3280af22 1009 || (PL_regflags & PMf_MULTILINE)))) {
c277df42
IZ
1010 r->anchored_substr = data.longest_fixed;
1011 r->anchored_offset = data.offset_fixed;
2779dcf1 1012 fbm_compile(r->anchored_substr, 0);
c277df42
IZ
1013 BmUSEFUL(r->anchored_substr) = 100;
1014 if (data.flags & SF_FIX_BEFORE_EOL /* Cannot have SEOL and MULTI */
1015 && (!(data.flags & SF_FIX_BEFORE_MEOL)
3280af22 1016 || (PL_regflags & PMf_MULTILINE)))
c277df42 1017 SvTAIL_on(r->anchored_substr);
a0ed51b3
LW
1018 }
1019 else {
c277df42
IZ
1020 r->anchored_substr = Nullsv;
1021 SvREFCNT_dec(data.longest_fixed);
c5254dd6 1022 longest_fixed_length = 0;
a0d0e21e 1023 }
c277df42
IZ
1024
1025 /* A temporary algorithm prefers floated substr to fixed one to dig more info. */
c5254dd6 1026 if (longest_fixed_length > longest_float_length) {
c277df42
IZ
1027 r->check_substr = r->anchored_substr;
1028 r->check_offset_min = r->check_offset_max = r->anchored_offset;
1029 if (r->reganch & ROPT_ANCH_SINGLE)
1030 r->reganch |= ROPT_NOSCAN;
a0ed51b3
LW
1031 }
1032 else {
c277df42
IZ
1033 r->check_substr = r->float_substr;
1034 r->check_offset_min = data.offset_float_min;
1035 r->check_offset_max = data.offset_float_max;
a0d0e21e 1036 }
a0ed51b3
LW
1037 }
1038 else {
c277df42
IZ
1039 /* Several toplevels. Best we can is to set minlen. */
1040 I32 fake;
1041
1042 DEBUG_r(PerlIO_printf(Perl_debug_log, "\n"));
1043 scan = r->program + 1;
3280af22 1044 minlen = study_chunk(&scan, &fake, scan + PL_regsize, NULL, 0);
c277df42 1045 r->check_substr = r->anchored_substr = r->float_substr = Nullsv;
a0d0e21e
LW
1046 }
1047
a0d0e21e 1048 r->minlen = minlen;
3280af22 1049 if (PL_regseen & REG_SEEN_GPOS)
c277df42 1050 r->reganch |= ROPT_GPOS_SEEN;
3280af22 1051 if (PL_regseen & REG_SEEN_LOOKBEHIND)
c277df42 1052 r->reganch |= ROPT_LOOKBEHIND_SEEN;
3280af22 1053 if (PL_regseen & REG_SEEN_EVAL)
ce862d02 1054 r->reganch |= ROPT_EVAL_SEEN;
3280af22
NIS
1055 Newz(1002, r->startp, PL_regnpar, char*);
1056 Newz(1002, r->endp, PL_regnpar, char*);
a0d0e21e
LW
1057 DEBUG_r(regdump(r));
1058 return(r);
a687059c
LW
1059}
1060
1061/*
1062 - reg - regular expression, i.e. main body or parenthesized thing
1063 *
1064 * Caller must absorb opening parenthesis.
1065 *
1066 * Combining parenthesis handling with the base level of regular expression
1067 * is a trifle forced, but the need to tie the tails of the branches to what
1068 * follows makes it hard to avoid.
1069 */
76e3520e 1070STATIC regnode *
8ac85365 1071reg(I32 paren, I32 *flagp)
c277df42 1072 /* paren: Parenthesized? 0=top, 1=(, inside: changed to letter. */
a687059c 1073{
5c0ca799 1074 dTHR;
c277df42
IZ
1075 register regnode *ret; /* Will be the head of the group. */
1076 register regnode *br;
1077 register regnode *lastbr;
1078 register regnode *ender = 0;
a0d0e21e 1079 register I32 parno = 0;
3280af22 1080 I32 flags, oregflags = PL_regflags, have_branch = 0, open = 0;
c277df42 1081 char c;
a0d0e21e 1082
821b33a5 1083 *flagp = 0; /* Tentatively. */
a0d0e21e
LW
1084
1085 /* Make an OPEN node, if parenthesized. */
1086 if (paren) {
3280af22 1087 if (*PL_regcomp_parse == '?') {
ca9dfc88
IZ
1088 U16 posflags = 0, negflags = 0;
1089 U16 *flagsp = &posflags;
0f5d15d6 1090 int logical = 0;
ca9dfc88 1091
3280af22
NIS
1092 PL_regcomp_parse++;
1093 paren = *PL_regcomp_parse++;
c277df42 1094 ret = NULL; /* For look-ahead/behind. */
a0d0e21e 1095 switch (paren) {
c277df42 1096 case '<':
3280af22
NIS
1097 PL_regseen |= REG_SEEN_LOOKBEHIND;
1098 if (*PL_regcomp_parse == '!')
c277df42 1099 paren = ',';
3280af22 1100 if (*PL_regcomp_parse != '=' && *PL_regcomp_parse != '!')
c277df42 1101 goto unknown;
3280af22 1102 PL_regcomp_parse++;
a0d0e21e
LW
1103 case '=':
1104 case '!':
3280af22 1105 PL_seen_zerolen++;
c277df42
IZ
1106 case ':':
1107 case '>':
a0d0e21e
LW
1108 break;
1109 case '$':
1110 case '@':
c277df42 1111 FAIL2("Sequence (?%c...) not implemented", (int)paren);
a0d0e21e
LW
1112 break;
1113 case '#':
3280af22
NIS
1114 while (*PL_regcomp_parse && *PL_regcomp_parse != ')')
1115 PL_regcomp_parse++;
1116 if (*PL_regcomp_parse != ')')
c277df42 1117 FAIL("Sequence (?#... not terminated");
a0d0e21e
LW
1118 nextchar();
1119 *flagp = TRYAGAIN;
1120 return NULL;
0f5d15d6
IZ
1121 case 'p':
1122 logical = 1;
1123 paren = *PL_regcomp_parse++;
1124 /* FALL THROUGH */
c277df42
IZ
1125 case '{':
1126 {
1127 dTHR;
1128 I32 count = 1, n = 0;
1129 char c;
3280af22 1130 char *s = PL_regcomp_parse;
c277df42
IZ
1131 SV *sv;
1132 OP_4tree *sop, *rop;
1133
3280af22
NIS
1134 PL_seen_zerolen++;
1135 PL_regseen |= REG_SEEN_EVAL;
1136 while (count && (c = *PL_regcomp_parse)) {
1137 if (c == '\\' && PL_regcomp_parse[1])
1138 PL_regcomp_parse++;
c277df42
IZ
1139 else if (c == '{')
1140 count++;
1141 else if (c == '}')
1142 count--;
3280af22 1143 PL_regcomp_parse++;
c277df42 1144 }
3280af22 1145 if (*PL_regcomp_parse != ')')
c277df42
IZ
1146 FAIL("Sequence (?{...}) not terminated or not {}-balanced");
1147 if (!SIZE_ONLY) {
1148 AV *av;
1149
3280af22
NIS
1150 if (PL_regcomp_parse - 1 - s)
1151 sv = newSVpv(s, PL_regcomp_parse - 1 - s);
c277df42
IZ
1152 else
1153 sv = newSVpv("", 0);
1154
1155 rop = sv_compile_2op(sv, &sop, "re", &av);
1156
1157 n = add_data(3, "nso");
3280af22
NIS
1158 PL_regcomp_rx->data->data[n] = (void*)rop;
1159 PL_regcomp_rx->data->data[n+1] = (void*)av;
1160 PL_regcomp_rx->data->data[n+2] = (void*)sop;
c277df42 1161 SvREFCNT_dec(sv);
a0ed51b3
LW
1162 }
1163 else { /* First pass */
1164 if (PL_reginterp_cnt < ++PL_seen_evals && PL_curcop != &compiling)
2cd61cdb
IZ
1165 /* No compiled RE interpolated, has runtime
1166 components ===> unsafe. */
1167 FAIL("Eval-group not allowed at runtime, use re 'eval'");
3280af22 1168 if (PL_tainted)
cc6b7395 1169 FAIL("Eval-group in insecure regular expression");
c277df42
IZ
1170 }
1171
1172 nextchar();
0f5d15d6
IZ
1173 if (logical) {
1174 ret = reg_node(LOGICAL);
1175 if (!SIZE_ONLY)
1176 ret->flags = 2;
1177 regtail(ret, reganode(EVAL, n));
1178 return ret;
1179 }
c277df42
IZ
1180 return reganode(EVAL, n);
1181 }
1182 case '(':
1183 {
3280af22
NIS
1184 if (PL_regcomp_parse[0] == '?') {
1185 if (PL_regcomp_parse[1] == '=' || PL_regcomp_parse[1] == '!'
1186 || PL_regcomp_parse[1] == '<'
1187 || PL_regcomp_parse[1] == '{') { /* Lookahead or eval. */
c277df42
IZ
1188 I32 flag;
1189
1190 ret = reg_node(LOGICAL);
0f5d15d6
IZ
1191 if (!SIZE_ONLY)
1192 ret->flags = 1;
c277df42
IZ
1193 regtail(ret, reg(1, &flag));
1194 goto insert_if;
1195 }
a0ed51b3
LW
1196 }
1197 else if (PL_regcomp_parse[0] >= '1' && PL_regcomp_parse[0] <= '9' ) {
3280af22 1198 parno = atoi(PL_regcomp_parse++);
c277df42 1199
3280af22
NIS
1200 while (isDIGIT(*PL_regcomp_parse))
1201 PL_regcomp_parse++;
c277df42
IZ
1202 ret = reganode(GROUPP, parno);
1203 if ((c = *nextchar()) != ')')
1204 FAIL2("Switch (?(number%c not recognized", c);
1205 insert_if:
1206 regtail(ret, reganode(IFTHEN, 0));
1207 br = regbranch(&flags, 1);
1208 if (br == NULL)
1209 br = reganode(LONGJMP, 0);
1210 else
1211 regtail(br, reganode(LONGJMP, 0));
1212 c = *nextchar();
d1b80229
IZ
1213 if (flags&HASWIDTH)
1214 *flagp |= HASWIDTH;
c277df42
IZ
1215 if (c == '|') {
1216 lastbr = reganode(IFTHEN, 0); /* Fake one for optimizer. */
1217 regbranch(&flags, 1);
1218 regtail(ret, lastbr);
d1b80229
IZ
1219 if (flags&HASWIDTH)
1220 *flagp |= HASWIDTH;
c277df42 1221 c = *nextchar();
a0ed51b3
LW
1222 }
1223 else
c277df42
IZ
1224 lastbr = NULL;
1225 if (c != ')')
1226 FAIL("Switch (?(condition)... contains too many branches");
1227 ender = reg_node(TAIL);
1228 regtail(br, ender);
1229 if (lastbr) {
1230 regtail(lastbr, ender);
1231 regtail(NEXTOPER(NEXTOPER(lastbr)), ender);
a0ed51b3
LW
1232 }
1233 else
c277df42
IZ
1234 regtail(ret, ender);
1235 return ret;
a0ed51b3
LW
1236 }
1237 else {
3280af22 1238 FAIL2("Unknown condition for (?(%.2s", PL_regcomp_parse);
c277df42
IZ
1239 }
1240 }
1b1626e4 1241 case 0:
c277df42 1242 FAIL("Sequence (? incomplete");
1b1626e4 1243 break;
a0d0e21e 1244 default:
3280af22 1245 --PL_regcomp_parse;
ca9dfc88 1246 parse_flags:
3280af22
NIS
1247 while (*PL_regcomp_parse && strchr("iogcmsx", *PL_regcomp_parse)) {
1248 if (*PL_regcomp_parse != 'o')
1249 pmflag(flagsp, *PL_regcomp_parse);
1250 ++PL_regcomp_parse;
ca9dfc88 1251 }
3280af22 1252 if (*PL_regcomp_parse == '-') {
ca9dfc88 1253 flagsp = &negflags;
3280af22 1254 ++PL_regcomp_parse;
ca9dfc88 1255 goto parse_flags;
48c036b1 1256 }
3280af22
NIS
1257 PL_regflags |= posflags;
1258 PL_regflags &= ~negflags;
1259 if (*PL_regcomp_parse == ':') {
1260 PL_regcomp_parse++;
ca9dfc88
IZ
1261 paren = ':';
1262 break;
1263 }
c277df42 1264 unknown:
3280af22
NIS
1265 if (*PL_regcomp_parse != ')')
1266 FAIL2("Sequence (?%c...) not recognized", *PL_regcomp_parse);
a0d0e21e
LW
1267 nextchar();
1268 *flagp = TRYAGAIN;
1269 return NULL;
1270 }
1271 }
1272 else {
3280af22
NIS
1273 parno = PL_regnpar;
1274 PL_regnpar++;
a0d0e21e 1275 ret = reganode(OPEN, parno);
c277df42 1276 open = 1;
a0d0e21e 1277 }
a0ed51b3
LW
1278 }
1279 else
a0d0e21e
LW
1280 ret = NULL;
1281
1282 /* Pick up the branches, linking them together. */
c277df42 1283 br = regbranch(&flags, 1);
a0d0e21e
LW
1284 if (br == NULL)
1285 return(NULL);
3280af22
NIS
1286 if (*PL_regcomp_parse == '|') {
1287 if (!SIZE_ONLY && PL_extralen) {
c277df42 1288 reginsert(BRANCHJ, br);
a0ed51b3
LW
1289 }
1290 else
c277df42
IZ
1291 reginsert(BRANCH, br);
1292 have_branch = 1;
1293 if (SIZE_ONLY)
3280af22 1294 PL_extralen += 1; /* For BRANCHJ-BRANCH. */
a0ed51b3
LW
1295 }
1296 else if (paren == ':') {
c277df42
IZ
1297 *flagp |= flags&SIMPLE;
1298 }
1299 if (open) { /* Starts with OPEN. */
1300 regtail(ret, br); /* OPEN -> first. */
a0ed51b3
LW
1301 }
1302 else if (paren != '?') /* Not Conditional */
a0d0e21e 1303 ret = br;
821b33a5
IZ
1304 if (flags&HASWIDTH)
1305 *flagp |= HASWIDTH;
a0d0e21e 1306 *flagp |= flags&SPSTART;
c277df42 1307 lastbr = br;
3280af22
NIS
1308 while (*PL_regcomp_parse == '|') {
1309 if (!SIZE_ONLY && PL_extralen) {
c277df42
IZ
1310 ender = reganode(LONGJMP,0);
1311 regtail(NEXTOPER(NEXTOPER(lastbr)), ender); /* Append to the previous. */
1312 }
1313 if (SIZE_ONLY)
3280af22 1314 PL_extralen += 2; /* Account for LONGJMP. */
a0d0e21e 1315 nextchar();
c277df42 1316 br = regbranch(&flags, 0);
a687059c 1317 if (br == NULL)
a0d0e21e 1318 return(NULL);
c277df42
IZ
1319 regtail(lastbr, br); /* BRANCH -> BRANCH. */
1320 lastbr = br;
821b33a5
IZ
1321 if (flags&HASWIDTH)
1322 *flagp |= HASWIDTH;
a687059c 1323 *flagp |= flags&SPSTART;
a0d0e21e
LW
1324 }
1325
c277df42
IZ
1326 if (have_branch || paren != ':') {
1327 /* Make a closing node, and hook it on the end. */
1328 switch (paren) {
1329 case ':':
1330 ender = reg_node(TAIL);
1331 break;
1332 case 1:
1333 ender = reganode(CLOSE, parno);
1334 break;
1335 case '<':
c277df42
IZ
1336 case ',':
1337 case '=':
1338 case '!':
c277df42 1339 *flagp &= ~HASWIDTH;
821b33a5
IZ
1340 /* FALL THROUGH */
1341 case '>':
1342 ender = reg_node(SUCCEED);
c277df42
IZ
1343 break;
1344 case 0:
1345 ender = reg_node(END);
1346 break;
1347 }
1348 regtail(lastbr, ender);
a0d0e21e 1349
c277df42
IZ
1350 if (have_branch) {
1351 /* Hook the tails of the branches to the closing node. */
1352 for (br = ret; br != NULL; br = regnext(br)) {
1353 regoptail(br, ender);
1354 }
1355 }
a0d0e21e 1356 }
c277df42
IZ
1357
1358 {
1359 char *p;
1360 static char parens[] = "=!<,>";
1361
1362 if (paren && (p = strchr(parens, paren))) {
1363 int node = ((p - parens) % 2) ? UNLESSM : IFMATCH;
1364 int flag = (p - parens) > 1;
1365
1366 if (paren == '>')
1367 node = SUSPEND, flag = 0;
1368 reginsert(node,ret);
c277df42 1369 ret->flags = flag;
c277df42
IZ
1370 regtail(ret, reg_node(TAIL));
1371 }
a0d0e21e
LW
1372 }
1373
1374 /* Check for proper termination. */
3280af22 1375 if (paren && (PL_regcomp_parse >= PL_regxend || *nextchar() != ')')) {
a0d0e21e 1376 FAIL("unmatched () in regexp");
a0ed51b3
LW
1377 }
1378 else if (!paren && PL_regcomp_parse < PL_regxend) {
3280af22 1379 if (*PL_regcomp_parse == ')') {
a0d0e21e 1380 FAIL("unmatched () in regexp");
a0ed51b3
LW
1381 }
1382 else
a0d0e21e
LW
1383 FAIL("junk on end of regexp"); /* "Can't happen". */
1384 /* NOTREACHED */
1385 }
c277df42 1386 if (paren != 0) {
3280af22 1387 PL_regflags = oregflags;
c277df42 1388 }
a687059c 1389
a0d0e21e 1390 return(ret);
a687059c
LW
1391}
1392
1393/*
1394 - regbranch - one alternative of an | operator
1395 *
1396 * Implements the concatenation operator.
1397 */
76e3520e 1398STATIC regnode *
c277df42 1399regbranch(I32 *flagp, I32 first)
a687059c 1400{
5c0ca799 1401 dTHR;
c277df42
IZ
1402 register regnode *ret;
1403 register regnode *chain = NULL;
1404 register regnode *latest;
1405 I32 flags = 0, c = 0;
a0d0e21e 1406
c277df42
IZ
1407 if (first)
1408 ret = NULL;
1409 else {
3280af22 1410 if (!SIZE_ONLY && PL_extralen)
c277df42
IZ
1411 ret = reganode(BRANCHJ,0);
1412 else
1413 ret = reg_node(BRANCH);
1414 }
1415
1416 if (!first && SIZE_ONLY)
3280af22 1417 PL_extralen += 1; /* BRANCHJ */
c277df42
IZ
1418
1419 *flagp = WORST; /* Tentatively. */
a0d0e21e 1420
3280af22 1421 PL_regcomp_parse--;
a0d0e21e 1422 nextchar();
3280af22 1423 while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != '|' && *PL_regcomp_parse != ')') {
a0d0e21e
LW
1424 flags &= ~TRYAGAIN;
1425 latest = regpiece(&flags);
1426 if (latest == NULL) {
1427 if (flags & TRYAGAIN)
1428 continue;
1429 return(NULL);
a0ed51b3
LW
1430 }
1431 else if (ret == NULL)
c277df42 1432 ret = latest;
a0d0e21e 1433 *flagp |= flags&HASWIDTH;
c277df42 1434 if (chain == NULL) /* First piece. */
a0d0e21e
LW
1435 *flagp |= flags&SPSTART;
1436 else {
3280af22 1437 PL_regnaughty++;
a0d0e21e 1438 regtail(chain, latest);
a687059c 1439 }
a0d0e21e 1440 chain = latest;
c277df42
IZ
1441 c++;
1442 }
1443 if (chain == NULL) { /* Loop ran zero times. */
1444 chain = reg_node(NOTHING);
1445 if (ret == NULL)
1446 ret = chain;
1447 }
1448 if (c == 1) {
1449 *flagp |= flags&SIMPLE;
a0d0e21e 1450 }
a687059c 1451
a0d0e21e 1452 return(ret);
a687059c
LW
1453}
1454
1455/*
1456 - regpiece - something followed by possible [*+?]
1457 *
1458 * Note that the branching code sequences used for ? and the general cases
1459 * of * and + are somewhat optimized: they use the same NOTHING node as
1460 * both the endmarker for their branch list and the body of the last branch.
1461 * It might seem that this node could be dispensed with entirely, but the
1462 * endmarker role is not redundant.
1463 */
76e3520e 1464STATIC regnode *
8ac85365 1465regpiece(I32 *flagp)
a687059c 1466{
5c0ca799 1467 dTHR;
c277df42 1468 register regnode *ret;
a0d0e21e
LW
1469 register char op;
1470 register char *next;
1471 I32 flags;
3280af22 1472 char *origparse = PL_regcomp_parse;
a0d0e21e
LW
1473 char *maxpos;
1474 I32 min;
c277df42 1475 I32 max = REG_INFTY;
a0d0e21e
LW
1476
1477 ret = regatom(&flags);
1478 if (ret == NULL) {
1479 if (flags & TRYAGAIN)
1480 *flagp |= TRYAGAIN;
1481 return(NULL);
1482 }
1483
3280af22 1484 op = *PL_regcomp_parse;
a0d0e21e 1485
3280af22
NIS
1486 if (op == '{' && regcurly(PL_regcomp_parse)) {
1487 next = PL_regcomp_parse + 1;
a0d0e21e
LW
1488 maxpos = Nullch;
1489 while (isDIGIT(*next) || *next == ',') {
1490 if (*next == ',') {
1491 if (maxpos)
1492 break;
1493 else
1494 maxpos = next;
a687059c 1495 }
a0d0e21e
LW
1496 next++;
1497 }
1498 if (*next == '}') { /* got one */
1499 if (!maxpos)
1500 maxpos = next;
3280af22
NIS
1501 PL_regcomp_parse++;
1502 min = atoi(PL_regcomp_parse);
a0d0e21e
LW
1503 if (*maxpos == ',')
1504 maxpos++;
1505 else
3280af22 1506 maxpos = PL_regcomp_parse;
a0d0e21e
LW
1507 max = atoi(maxpos);
1508 if (!max && *maxpos != '0')
c277df42
IZ
1509 max = REG_INFTY; /* meaning "infinity" */
1510 else if (max >= REG_INFTY)
1511 FAIL2("Quantifier in {,} bigger than %d", REG_INFTY - 1);
3280af22 1512 PL_regcomp_parse = next;
a0d0e21e
LW
1513 nextchar();
1514
1515 do_curly:
1516 if ((flags&SIMPLE)) {
3280af22 1517 PL_regnaughty += 2 + PL_regnaughty / 2;
a0d0e21e
LW
1518 reginsert(CURLY, ret);
1519 }
1520 else {
3280af22 1521 PL_regnaughty += 4 + PL_regnaughty; /* compound interest */
c277df42 1522 regtail(ret, reg_node(WHILEM));
3280af22 1523 if (!SIZE_ONLY && PL_extralen) {
c277df42
IZ
1524 reginsert(LONGJMP,ret);
1525 reginsert(NOTHING,ret);
1526 NEXT_OFF(ret) = 3; /* Go over LONGJMP. */
1527 }
a0d0e21e 1528 reginsert(CURLYX,ret);
3280af22 1529 if (!SIZE_ONLY && PL_extralen)
c277df42
IZ
1530 NEXT_OFF(ret) = 3; /* Go over NOTHING to LONGJMP. */
1531 regtail(ret, reg_node(NOTHING));
1532 if (SIZE_ONLY)
3280af22 1533 PL_extralen += 3;
a0d0e21e 1534 }
c277df42 1535 ret->flags = 0;
a0d0e21e
LW
1536
1537 if (min > 0)
821b33a5
IZ
1538 *flagp = WORST;
1539 if (max > 0)
1540 *flagp |= HASWIDTH;
a0d0e21e 1541 if (max && max < min)
c277df42
IZ
1542 FAIL("Can't do {n,m} with n > m");
1543 if (!SIZE_ONLY) {
1544 ARG1_SET(ret, min);
1545 ARG2_SET(ret, max);
a687059c 1546 }
a687059c 1547
a0d0e21e 1548 goto nest_check;
a687059c 1549 }
a0d0e21e 1550 }
a687059c 1551
a0d0e21e
LW
1552 if (!ISMULT1(op)) {
1553 *flagp = flags;
a687059c 1554 return(ret);
a0d0e21e 1555 }
bb20fd44 1556
c277df42 1557#if 0 /* Now runtime fix should be reliable. */
bb20fd44 1558 if (!(flags&HASWIDTH) && op != '?')
c277df42
IZ
1559 FAIL("regexp *+ operand could be empty");
1560#endif
bb20fd44 1561
a0d0e21e
LW
1562 nextchar();
1563
821b33a5 1564 *flagp = (op != '+') ? (WORST|SPSTART|HASWIDTH) : (WORST|HASWIDTH);
a0d0e21e
LW
1565
1566 if (op == '*' && (flags&SIMPLE)) {
1567 reginsert(STAR, ret);
c277df42 1568 ret->flags = 0;
3280af22 1569 PL_regnaughty += 4;
a0d0e21e
LW
1570 }
1571 else if (op == '*') {
1572 min = 0;
1573 goto do_curly;
a0ed51b3
LW
1574 }
1575 else if (op == '+' && (flags&SIMPLE)) {
a0d0e21e 1576 reginsert(PLUS, ret);
c277df42 1577 ret->flags = 0;
3280af22 1578 PL_regnaughty += 3;
a0d0e21e
LW
1579 }
1580 else if (op == '+') {
1581 min = 1;
1582 goto do_curly;
a0ed51b3
LW
1583 }
1584 else if (op == '?') {
a0d0e21e
LW
1585 min = 0; max = 1;
1586 goto do_curly;
1587 }
1588 nest_check:
17feb5d5 1589 if (ckWARN(WARN_UNSAFE) && !SIZE_ONLY && !(flags&HASWIDTH) && max > REG_INFTY/3) {
599cee73 1590 warner(WARN_UNSAFE, "%.*s matches null string many times",
3280af22 1591 PL_regcomp_parse - origparse, origparse);
a0d0e21e
LW
1592 }
1593
3280af22 1594 if (*PL_regcomp_parse == '?') {
a0d0e21e
LW
1595 nextchar();
1596 reginsert(MINMOD, ret);
c277df42 1597 regtail(ret, ret + NODE_STEP_REGNODE);
a0d0e21e 1598 }
3280af22 1599 if (ISMULT2(PL_regcomp_parse))
a0d0e21e
LW
1600 FAIL("nested *?+ in regexp");
1601
1602 return(ret);
a687059c
LW
1603}
1604
1605/*
1606 - regatom - the lowest level
1607 *
1608 * Optimization: gobbles an entire sequence of ordinary characters so that
1609 * it can turn them into a single node, which is smaller to store and
1610 * faster to run. Backslashed characters are exceptions, each becoming a
1611 * separate node; the code is simpler that way and it's not worth fixing.
1612 *
1613 * [Yes, it is worth fixing, some scripts can run twice the speed.]
1614 */
76e3520e 1615STATIC regnode *
8ac85365 1616regatom(I32 *flagp)
a687059c 1617{
5c0ca799 1618 dTHR;
c277df42 1619 register regnode *ret = 0;
a0d0e21e
LW
1620 I32 flags;
1621
1622 *flagp = WORST; /* Tentatively. */
1623
1624tryagain:
3280af22 1625 switch (*PL_regcomp_parse) {
a0d0e21e 1626 case '^':
3280af22 1627 PL_seen_zerolen++;
a0d0e21e 1628 nextchar();
3280af22 1629 if (PL_regflags & PMf_MULTILINE)
c277df42 1630 ret = reg_node(MBOL);
3280af22 1631 else if (PL_regflags & PMf_SINGLELINE)
c277df42 1632 ret = reg_node(SBOL);
a0d0e21e 1633 else
c277df42 1634 ret = reg_node(BOL);
a0d0e21e
LW
1635 break;
1636 case '$':
3280af22
NIS
1637 if (PL_regcomp_parse[1])
1638 PL_seen_zerolen++;
a0d0e21e 1639 nextchar();
3280af22 1640 if (PL_regflags & PMf_MULTILINE)
c277df42 1641 ret = reg_node(MEOL);
3280af22 1642 else if (PL_regflags & PMf_SINGLELINE)
c277df42 1643 ret = reg_node(SEOL);
a0d0e21e 1644 else
c277df42 1645 ret = reg_node(EOL);
a0d0e21e
LW
1646 break;
1647 case '.':
1648 nextchar();
a0ed51b3
LW
1649 if (UTF) {
1650 if (PL_regflags & PMf_SINGLELINE)
1651 ret = reg_node(SANYUTF8);
1652 else
1653 ret = reg_node(ANYUTF8);
1654 *flagp |= HASWIDTH;
1655 }
1656 else {
1657 if (PL_regflags & PMf_SINGLELINE)
1658 ret = reg_node(SANY);
1659 else
1660 ret = reg_node(ANY);
1661 *flagp |= HASWIDTH|SIMPLE;
1662 }
3280af22 1663 PL_regnaughty++;
a0d0e21e
LW
1664 break;
1665 case '[':
3280af22 1666 PL_regcomp_parse++;
a0ed51b3 1667 ret = (UTF ? regclassutf8() : regclass());
a14b48bc
LW
1668 if (*PL_regcomp_parse != ']')
1669 FAIL("unmatched [] in regexp");
1670 nextchar();
a0d0e21e
LW
1671 *flagp |= HASWIDTH|SIMPLE;
1672 break;
1673 case '(':
1674 nextchar();
1675 ret = reg(1, &flags);
1676 if (ret == NULL) {
1677 if (flags & TRYAGAIN)
1678 goto tryagain;
1679 return(NULL);
1680 }
c277df42 1681 *flagp |= flags&(HASWIDTH|SPSTART|SIMPLE);
a0d0e21e
LW
1682 break;
1683 case '|':
1684 case ')':
1685 if (flags & TRYAGAIN) {
1686 *flagp |= TRYAGAIN;
1687 return NULL;
1688 }
3280af22 1689 FAIL2("internal urp in regexp at /%s/", PL_regcomp_parse);
a0d0e21e
LW
1690 /* Supposed to be caught earlier. */
1691 break;
85afd4ae 1692 case '{':
3280af22
NIS
1693 if (!regcurly(PL_regcomp_parse)) {
1694 PL_regcomp_parse++;
85afd4ae
CS
1695 goto defchar;
1696 }
1697 /* FALL THROUGH */
a0d0e21e
LW
1698 case '?':
1699 case '+':
1700 case '*':
3115e423 1701 FAIL("?+*{} follows nothing in regexp");
a0d0e21e
LW
1702 break;
1703 case '\\':
3280af22 1704 switch (*++PL_regcomp_parse) {
a0d0e21e 1705 case 'A':
3280af22 1706 PL_seen_zerolen++;
c277df42 1707 ret = reg_node(SBOL);
a0d0e21e
LW
1708 *flagp |= SIMPLE;
1709 nextchar();
1710 break;
1711 case 'G':
c277df42 1712 ret = reg_node(GPOS);
3280af22 1713 PL_regseen |= REG_SEEN_GPOS;
a0d0e21e
LW
1714 *flagp |= SIMPLE;
1715 nextchar();
1716 break;
1717 case 'Z':
c277df42 1718 ret = reg_node(SEOL);
a0d0e21e
LW
1719 *flagp |= SIMPLE;
1720 nextchar();
1721 break;
b85d18e9
IZ
1722 case 'z':
1723 ret = reg_node(EOS);
1724 *flagp |= SIMPLE;
3280af22 1725 PL_seen_zerolen++; /* Do not optimize RE away */
b85d18e9
IZ
1726 nextchar();
1727 break;
a0ed51b3
LW
1728 case 'C':
1729 ret = reg_node(SANY);
1730 *flagp |= HASWIDTH|SIMPLE;
1731 nextchar();
1732 break;
1733 case 'X':
1734 ret = reg_node(CLUMP);
1735 *flagp |= HASWIDTH;
1736 nextchar();
1737 if (UTF && !PL_utf8_mark)
dfe13c55 1738 is_utf8_mark((U8*)"~"); /* preload table */
a0ed51b3 1739 break;
a0d0e21e 1740 case 'w':
a0ed51b3
LW
1741 ret = reg_node(
1742 UTF
1743 ? (LOC ? ALNUMLUTF8 : ALNUMUTF8)
1744 : (LOC ? ALNUML : ALNUM));
a0d0e21e
LW
1745 *flagp |= HASWIDTH|SIMPLE;
1746 nextchar();
a0ed51b3 1747 if (UTF && !PL_utf8_alnum)
dfe13c55 1748 is_utf8_alnum((U8*)"a"); /* preload table */
a0d0e21e
LW
1749 break;
1750 case 'W':
a0ed51b3
LW
1751 ret = reg_node(
1752 UTF
1753 ? (LOC ? NALNUMLUTF8 : NALNUMUTF8)
1754 : (LOC ? NALNUML : NALNUM));
a0d0e21e
LW
1755 *flagp |= HASWIDTH|SIMPLE;
1756 nextchar();
a0ed51b3 1757 if (UTF && !PL_utf8_alnum)
dfe13c55 1758 is_utf8_alnum((U8*)"a"); /* preload table */
a0d0e21e
LW
1759 break;
1760 case 'b':
3280af22 1761 PL_seen_zerolen++;
a0ed51b3
LW
1762 ret = reg_node(
1763 UTF
1764 ? (LOC ? BOUNDLUTF8 : BOUNDUTF8)
1765 : (LOC ? BOUNDL : BOUND));
a0d0e21e
LW
1766 *flagp |= SIMPLE;
1767 nextchar();
a0ed51b3 1768 if (UTF && !PL_utf8_alnum)
dfe13c55 1769 is_utf8_alnum((U8*)"a"); /* preload table */
a0d0e21e
LW
1770 break;
1771 case 'B':
3280af22 1772 PL_seen_zerolen++;
a0ed51b3
LW
1773 ret = reg_node(
1774 UTF
1775 ? (LOC ? NBOUNDLUTF8 : NBOUNDUTF8)
1776 : (LOC ? NBOUNDL : NBOUND));
a0d0e21e
LW
1777 *flagp |= SIMPLE;
1778 nextchar();
a0ed51b3 1779 if (UTF && !PL_utf8_alnum)
dfe13c55 1780 is_utf8_alnum((U8*)"a"); /* preload table */
a0d0e21e
LW
1781 break;
1782 case 's':
a0ed51b3
LW
1783 ret = reg_node(
1784 UTF
1785 ? (LOC ? SPACELUTF8 : SPACEUTF8)
1786 : (LOC ? SPACEL : SPACE));
a0d0e21e
LW
1787 *flagp |= HASWIDTH|SIMPLE;
1788 nextchar();
a0ed51b3 1789 if (UTF && !PL_utf8_space)
dfe13c55 1790 is_utf8_space((U8*)" "); /* preload table */
a0d0e21e
LW
1791 break;
1792 case 'S':
a0ed51b3
LW
1793 ret = reg_node(
1794 UTF
1795 ? (LOC ? NSPACELUTF8 : NSPACEUTF8)
1796 : (LOC ? NSPACEL : NSPACE));
a0d0e21e
LW
1797 *flagp |= HASWIDTH|SIMPLE;
1798 nextchar();
a0ed51b3 1799 if (UTF && !PL_utf8_space)
dfe13c55 1800 is_utf8_space((U8*)" "); /* preload table */
a0d0e21e
LW
1801 break;
1802 case 'd':
a0ed51b3 1803 ret = reg_node(UTF ? DIGITUTF8 : DIGIT);
a0d0e21e
LW
1804 *flagp |= HASWIDTH|SIMPLE;
1805 nextchar();
a0ed51b3 1806 if (UTF && !PL_utf8_digit)
dfe13c55 1807 is_utf8_digit((U8*)"1"); /* preload table */
a0d0e21e
LW
1808 break;
1809 case 'D':
a0ed51b3 1810 ret = reg_node(UTF ? NDIGITUTF8 : NDIGIT);
a0d0e21e
LW
1811 *flagp |= HASWIDTH|SIMPLE;
1812 nextchar();
a0ed51b3 1813 if (UTF && !PL_utf8_digit)
dfe13c55 1814 is_utf8_digit((U8*)"1"); /* preload table */
a0d0e21e 1815 break;
a14b48bc
LW
1816 case 'p':
1817 case 'P':
1818 { /* a lovely hack--pretend we saw [\pX] instead */
1819 char* oldregxend = PL_regxend;
1820
1821 if (PL_regcomp_parse[1] == '{') {
1822 PL_regxend = strchr(PL_regcomp_parse, '}');
1823 if (!PL_regxend)
1824 FAIL("Missing right brace on \\p{}");
1825 PL_regxend++;
1826 }
1827 else
1828 PL_regxend = PL_regcomp_parse + 2;
1829 PL_regcomp_parse--;
1830
1831 ret = regclassutf8();
1832
1833 PL_regxend = oldregxend;
1834 PL_regcomp_parse--;
1835 nextchar();
1836 *flagp |= HASWIDTH|SIMPLE;
1837 }
1838 break;
a0d0e21e
LW
1839 case 'n':
1840 case 'r':
1841 case 't':
1842 case 'f':
1843 case 'e':
1844 case 'a':
1845 case 'x':
1846 case 'c':
1847 case '0':
1848 goto defchar;
1849 case '1': case '2': case '3': case '4':
1850 case '5': case '6': case '7': case '8': case '9':
1851 {
3280af22 1852 I32 num = atoi(PL_regcomp_parse);
a0d0e21e 1853
3280af22 1854 if (num > 9 && num >= PL_regnpar)
a0d0e21e
LW
1855 goto defchar;
1856 else {
3280af22 1857 if (!SIZE_ONLY && num > PL_regcomp_rx->nparens)
ef64f398 1858 FAIL("reference to nonexistent group");
3280af22 1859 PL_regsawback = 1;
a0ed51b3
LW
1860 ret = reganode(FOLD
1861 ? (LOC ? REFFL : REFF)
c8756f30 1862 : REF, num);
a0d0e21e 1863 *flagp |= HASWIDTH;
3280af22
NIS
1864 while (isDIGIT(*PL_regcomp_parse))
1865 PL_regcomp_parse++;
1866 PL_regcomp_parse--;
a0d0e21e
LW
1867 nextchar();
1868 }
1869 }
1870 break;
1871 case '\0':
3280af22 1872 if (PL_regcomp_parse >= PL_regxend)
a0d0e21e
LW
1873 FAIL("trailing \\ in regexp");
1874 /* FALL THROUGH */
1875 default:
1876 goto defchar;
1877 }
1878 break;
4633a7c4
LW
1879
1880 case '#':
3280af22
NIS
1881 if (PL_regflags & PMf_EXTENDED) {
1882 while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != '\n') PL_regcomp_parse++;
1883 if (PL_regcomp_parse < PL_regxend)
4633a7c4
LW
1884 goto tryagain;
1885 }
1886 /* FALL THROUGH */
1887
a0d0e21e
LW
1888 default: {
1889 register I32 len;
a0ed51b3 1890 register UV ender;
a0d0e21e 1891 register char *p;
c277df42 1892 char *oldp, *s;
a0d0e21e
LW
1893 I32 numlen;
1894
3280af22 1895 PL_regcomp_parse++;
a0d0e21e
LW
1896
1897 defchar:
a0ed51b3
LW
1898 ret = reg_node(FOLD
1899 ? (LOC ? EXACTFL : EXACTF)
bbce6d69 1900 : EXACT);
161b471a 1901 s = (char *) OPERAND(ret);
c277df42 1902 regc(0, s++); /* save spot for len */
3280af22
NIS
1903 for (len = 0, p = PL_regcomp_parse - 1;
1904 len < 127 && p < PL_regxend;
a0d0e21e
LW
1905 len++)
1906 {
1907 oldp = p;
5b5a24f7 1908
3280af22
NIS
1909 if (PL_regflags & PMf_EXTENDED)
1910 p = regwhite(p, PL_regxend);
a0d0e21e
LW
1911 switch (*p) {
1912 case '^':
1913 case '$':
1914 case '.':
1915 case '[':
1916 case '(':
1917 case ')':
1918 case '|':
1919 goto loopdone;
1920 case '\\':
1921 switch (*++p) {
1922 case 'A':
1923 case 'G':
1924 case 'Z':
b85d18e9 1925 case 'z':
a0d0e21e
LW
1926 case 'w':
1927 case 'W':
1928 case 'b':
1929 case 'B':
1930 case 's':
1931 case 'S':
1932 case 'd':
1933 case 'D':
a14b48bc
LW
1934 case 'p':
1935 case 'P':
a0d0e21e
LW
1936 --p;
1937 goto loopdone;
1938 case 'n':
1939 ender = '\n';
1940 p++;
a687059c 1941 break;
a0d0e21e
LW
1942 case 'r':
1943 ender = '\r';
1944 p++;
a687059c 1945 break;
a0d0e21e
LW
1946 case 't':
1947 ender = '\t';
1948 p++;
a687059c 1949 break;
a0d0e21e
LW
1950 case 'f':
1951 ender = '\f';
1952 p++;
a687059c 1953 break;
a0d0e21e
LW
1954 case 'e':
1955 ender = '\033';
1956 p++;
a687059c 1957 break;
a0d0e21e
LW
1958 case 'a':
1959 ender = '\007';
1960 p++;
a687059c 1961 break;
a0d0e21e 1962 case 'x':
a0ed51b3
LW
1963 if (*++p == '{') {
1964 char* e = strchr(p, '}');
1965
1966 if (!e)
1967 FAIL("Missing right brace on \\x{}");
1968 else if (UTF) {
1969 ender = scan_hex(p + 1, e - p, &numlen);
1970 if (numlen + len >= 127) { /* numlen is generous */
1971 p--;
1972 goto loopdone;
1973 }
1974 p = e + 1;
1975 }
1976 else
1977 FAIL("Can't use \\x{} without 'use utf8' declaration");
1978 }
1979 else {
1980 ender = scan_hex(p, 2, &numlen);
1981 p += numlen;
1982 }
a687059c 1983 break;
a0d0e21e
LW
1984 case 'c':
1985 p++;
bbce6d69
PP
1986 ender = UCHARAT(p++);
1987 ender = toCTRL(ender);
a687059c 1988 break;
a0d0e21e
LW
1989 case '0': case '1': case '2': case '3':case '4':
1990 case '5': case '6': case '7': case '8':case '9':
1991 if (*p == '0' ||
3280af22 1992 (isDIGIT(p[1]) && atoi(p) >= PL_regnpar) ) {
a0d0e21e
LW
1993 ender = scan_oct(p, 3, &numlen);
1994 p += numlen;
1995 }
1996 else {
1997 --p;
1998 goto loopdone;
a687059c
LW
1999 }
2000 break;
a0d0e21e 2001 case '\0':
3280af22 2002 if (p >= PL_regxend)
a687059c
LW
2003 FAIL("trailing \\ in regexp");
2004 /* FALL THROUGH */
a0d0e21e 2005 default:
a0ed51b3 2006 goto normal_default;
a0d0e21e
LW
2007 }
2008 break;
a687059c 2009 default:
a0ed51b3
LW
2010 normal_default:
2011 if ((*p & 0xc0) == 0xc0 && UTF) {
dfe13c55 2012 ender = utf8_to_uv((U8*)p, &numlen);
a0ed51b3
LW
2013 p += numlen;
2014 }
2015 else
2016 ender = *p++;
a0d0e21e 2017 break;
a687059c 2018 }
3280af22
NIS
2019 if (PL_regflags & PMf_EXTENDED)
2020 p = regwhite(p, PL_regxend);
a0ed51b3
LW
2021 if (UTF && FOLD) {
2022 if (LOC)
2023 ender = toLOWER_LC_uni(ender);
2024 else
2025 ender = toLOWER_uni(ender);
2026 }
a0d0e21e
LW
2027 if (ISMULT2(p)) { /* Back off on ?+*. */
2028 if (len)
2029 p = oldp;
a0ed51b3
LW
2030 else if (ender >= 0x80 && UTF) {
2031 reguni(ender, s, &numlen);
2032 s += numlen;
2033 len += numlen;
2034 }
a0d0e21e
LW
2035 else {
2036 len++;
c277df42 2037 regc(ender, s++);
a0d0e21e
LW
2038 }
2039 break;
a687059c 2040 }
a0ed51b3
LW
2041 if (ender >= 0x80 && UTF) {
2042 reguni(ender, s, &numlen);
2043 s += numlen;
2044 len += numlen - 1;
2045 }
2046 else
2047 regc(ender, s++);
a0d0e21e
LW
2048 }
2049 loopdone:
3280af22 2050 PL_regcomp_parse = p - 1;
a0d0e21e
LW
2051 nextchar();
2052 if (len < 0)
2053 FAIL("internal disaster in regexp");
2054 if (len > 0)
2055 *flagp |= HASWIDTH;
2056 if (len == 1)
2057 *flagp |= SIMPLE;
c277df42 2058 if (!SIZE_ONLY)
a0d0e21e 2059 *OPERAND(ret) = len;
c277df42
IZ
2060 regc('\0', s++);
2061 if (SIZE_ONLY) {
3280af22 2062 PL_regsize += (len + 2 + sizeof(regnode) - 1) / sizeof(regnode);
a0ed51b3
LW
2063 }
2064 else {
3280af22 2065 PL_regcode += (len + 2 + sizeof(regnode) - 1) / sizeof(regnode);
c277df42 2066 }
a687059c 2067 }
a0d0e21e
LW
2068 break;
2069 }
a687059c 2070
a0d0e21e 2071 return(ret);
a687059c
LW
2072}
2073
873ef191 2074STATIC char *
8ac85365 2075regwhite(char *p, char *e)
5b5a24f7
CS
2076{
2077 while (p < e) {
2078 if (isSPACE(*p))
2079 ++p;
2080 else if (*p == '#') {
2081 do {
2082 p++;
2083 } while (p < e && *p != '\n');
2084 }
2085 else
2086 break;
2087 }
2088 return p;
2089}
2090
76e3520e 2091STATIC regnode *
8ac85365 2092regclass(void)
a687059c 2093{
5c0ca799 2094 dTHR;
c277df42 2095 register char *opnd, *s;
a0ed51b3
LW
2096 register I32 value;
2097 register I32 lastvalue = 1234;
a0d0e21e 2098 register I32 range = 0;
c277df42 2099 register regnode *ret;
a0d0e21e
LW
2100 register I32 def;
2101 I32 numlen;
2102
3280af22 2103 s = opnd = (char *) OPERAND(PL_regcode);
c277df42 2104 ret = reg_node(ANYOF);
a0ed51b3 2105 for (value = 0; value < 33; value++)
c277df42 2106 regc(0, s++);
3280af22
NIS
2107 if (*PL_regcomp_parse == '^') { /* Complement of range. */
2108 PL_regnaughty++;
2109 PL_regcomp_parse++;
c277df42 2110 if (!SIZE_ONLY)
bbce6d69
PP
2111 *opnd |= ANYOF_INVERT;
2112 }
c277df42 2113 if (!SIZE_ONLY) {
3280af22 2114 PL_regcode += ANY_SKIP;
a0ed51b3 2115 if (FOLD)
bbce6d69 2116 *opnd |= ANYOF_FOLD;
a0ed51b3 2117 if (LOC)
bbce6d69 2118 *opnd |= ANYOF_LOCALE;
a0ed51b3
LW
2119 }
2120 else {
3280af22 2121 PL_regsize += ANY_SKIP;
a0d0e21e 2122 }
3280af22 2123 if (*PL_regcomp_parse == ']' || *PL_regcomp_parse == '-')
a0d0e21e 2124 goto skipcond; /* allow 1st char to be ] or - */
3280af22 2125 while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != ']') {
a0d0e21e 2126 skipcond:
a0ed51b3
LW
2127 value = UCHARAT(PL_regcomp_parse++);
2128 if (value == '[' && PL_regcomp_parse + 1 < PL_regxend &&
4599a1de 2129 /* I smell either [: or [= or [. -- POSIX has been here, right? */
3280af22
NIS
2130 (*PL_regcomp_parse == ':' || *PL_regcomp_parse == '=' || *PL_regcomp_parse == '.')) {
2131 char posixccc = *PL_regcomp_parse;
2132 char* posixccs = PL_regcomp_parse++;
4599a1de 2133
3280af22
NIS
2134 while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != posixccc)
2135 PL_regcomp_parse++;
2136 if (PL_regcomp_parse == PL_regxend)
4599a1de 2137 /* Grandfather lone [:, [=, [. */
3280af22 2138 PL_regcomp_parse = posixccs;
4599a1de 2139 else {
3280af22
NIS
2140 PL_regcomp_parse++; /* skip over the posixccc */
2141 if (*PL_regcomp_parse == ']') {
4599a1de
JH
2142 /* Not Implemented Yet.
2143 * (POSIX Extended Character Classes, that is)
2144 * The text between e.g. [: and :] would start
77d41b28 2145 * at posixccs + 1 and stop at regcomp_parse - 2. */
599cee73
PM
2146 if (ckWARN(WARN_UNSAFE) && !SIZE_ONLY)
2147 warner(WARN_UNSAFE,
2148 "Character class syntax [%c %c] is reserved for future extensions", posixccc, posixccc);
3280af22 2149 PL_regcomp_parse++; /* skip over the ending ] */
4599a1de
JH
2150 }
2151 }
2152 }
a0ed51b3
LW
2153 if (value == '\\') {
2154 value = UCHARAT(PL_regcomp_parse++);
2155 switch (value) {
a0d0e21e 2156 case 'w':
ae5c130c 2157 if (!SIZE_ONLY) {
a0ed51b3 2158 if (LOC)
bbce6d69 2159 *opnd |= ANYOF_ALNUML;
ae5c130c 2160 else {
a0ed51b3
LW
2161 for (value = 0; value < 256; value++)
2162 if (isALNUM(value))
2163 ANYOF_SET(opnd, value);
ae5c130c 2164 }
bbce6d69 2165 }
a0ed51b3 2166 lastvalue = 1234;
a0d0e21e
LW
2167 continue;
2168 case 'W':
ae5c130c 2169 if (!SIZE_ONLY) {
a0ed51b3 2170 if (LOC)
bbce6d69 2171 *opnd |= ANYOF_NALNUML;
ae5c130c 2172 else {
a0ed51b3
LW
2173 for (value = 0; value < 256; value++)
2174 if (!isALNUM(value))
2175 ANYOF_SET(opnd, value);
ae5c130c 2176 }
bbce6d69 2177 }
a0ed51b3 2178 lastvalue = 1234;
a0d0e21e
LW
2179 continue;
2180 case 's':
ae5c130c 2181 if (!SIZE_ONLY) {
a0ed51b3 2182 if (LOC)
bbce6d69 2183 *opnd |= ANYOF_SPACEL;
ae5c130c 2184 else {
a0ed51b3
LW
2185 for (value = 0; value < 256; value++)
2186 if (isSPACE(value))
2187 ANYOF_SET(opnd, value);
ae5c130c 2188 }
bbce6d69 2189 }
a0ed51b3 2190 lastvalue = 1234;
a0d0e21e
LW
2191 continue;
2192 case 'S':
ae5c130c 2193 if (!SIZE_ONLY) {
a0ed51b3 2194 if (LOC)
bbce6d69 2195 *opnd |= ANYOF_NSPACEL;
ae5c130c 2196 else {
a0ed51b3
LW
2197 for (value = 0; value < 256; value++)
2198 if (!isSPACE(value))
2199 ANYOF_SET(opnd, value);
ae5c130c 2200 }
bbce6d69 2201 }
a0ed51b3 2202 lastvalue = 1234;
a0d0e21e
LW
2203 continue;
2204 case 'd':
ae5c130c 2205 if (!SIZE_ONLY) {
a0ed51b3
LW
2206 for (value = '0'; value <= '9'; value++)
2207 ANYOF_SET(opnd, value);
ae5c130c 2208 }
a0ed51b3 2209 lastvalue = 1234;
a0d0e21e
LW
2210 continue;
2211 case 'D':
ae5c130c 2212 if (!SIZE_ONLY) {
a0ed51b3
LW
2213 for (value = 0; value < '0'; value++)
2214 ANYOF_SET(opnd, value);
2215 for (value = '9' + 1; value < 256; value++)
2216 ANYOF_SET(opnd, value);
ae5c130c 2217 }
a0ed51b3 2218 lastvalue = 1234;
a0d0e21e
LW
2219 continue;
2220 case 'n':
a0ed51b3 2221 value = '\n';
a0d0e21e
LW
2222 break;
2223 case 'r':
a0ed51b3 2224 value = '\r';
a0d0e21e
LW
2225 break;
2226 case 't':
a0ed51b3 2227 value = '\t';
a0d0e21e
LW
2228 break;
2229 case 'f':
a0ed51b3 2230 value = '\f';
a0d0e21e
LW
2231 break;
2232 case 'b':
a0ed51b3 2233 value = '\b';
a0d0e21e
LW
2234 break;
2235 case 'e':
a0ed51b3 2236 value = '\033';
a0d0e21e
LW
2237 break;
2238 case 'a':
a0ed51b3 2239 value = '\007';
a0d0e21e
LW
2240 break;
2241 case 'x':
a0ed51b3 2242 value = scan_hex(PL_regcomp_parse, 2, &numlen);
3280af22 2243 PL_regcomp_parse += numlen;
a0d0e21e
LW
2244 break;
2245 case 'c':
a0ed51b3
LW
2246 value = UCHARAT(PL_regcomp_parse++);
2247 value = toCTRL(value);
a0d0e21e
LW
2248 break;
2249 case '0': case '1': case '2': case '3': case '4':
2250 case '5': case '6': case '7': case '8': case '9':
a0ed51b3 2251 value = scan_oct(--PL_regcomp_parse, 3, &numlen);
3280af22 2252 PL_regcomp_parse += numlen;
a0d0e21e
LW
2253 break;
2254 }
2255 }
2256 if (range) {
a0ed51b3 2257 if (lastvalue > value)
a0d0e21e
LW
2258 FAIL("invalid [] range in regexp");
2259 range = 0;
2260 }
2261 else {
a0ed51b3 2262 lastvalue = value;
3280af22
NIS
2263 if (*PL_regcomp_parse == '-' && PL_regcomp_parse+1 < PL_regxend &&
2264 PL_regcomp_parse[1] != ']') {
2265 PL_regcomp_parse++;
a0d0e21e
LW
2266 range = 1;
2267 continue; /* do it next time */
2268 }
a687059c 2269 }
ae5c130c 2270 if (!SIZE_ONLY) {
8ada0baa
JH
2271#ifndef ASCIIish
2272 if ((isLOWER(lastvalue) && isLOWER(value)) ||
c8dba6f3
GS
2273 (isUPPER(lastvalue) && isUPPER(value)))
2274 {
2275 I32 i;
8ada0baa
JH
2276 if (isLOWER(lastvalue)) {
2277 for (i = lastvalue; i <= value; i++)
2278 if (isLOWER(i))
2279 ANYOF_SET(opnd, i);
2280 } else {
2281 for (i = lastvalue; i <= value; i++)
2282 if (isUPPER(i))
2283 ANYOF_SET(opnd, i);
2284 }
2285 }
2286 else
2287#endif
2288 for ( ; lastvalue <= value; lastvalue++)
2289 ANYOF_SET(opnd, lastvalue);
2290 }
a0ed51b3 2291 lastvalue = value;
a0d0e21e 2292 }
ae5c130c
GS
2293 /* optimize case-insensitive simple patterns (e.g. /[a-z]/i) */
2294 if (!SIZE_ONLY && (*opnd & (0xFF ^ ANYOF_INVERT)) == ANYOF_FOLD) {
a0ed51b3
LW
2295 for (value = 0; value < 256; ++value) {
2296 if (ANYOF_TEST(opnd, value)) {
2297 I32 cf = fold[value];
ae5c130c
GS
2298 ANYOF_SET(opnd, cf);
2299 }
2300 }
2301 *opnd &= ~ANYOF_FOLD;
2302 }
2303 /* optimize inverted simple patterns (e.g. [^a-z]) */
2304 if (!SIZE_ONLY && (*opnd & 0xFF) == ANYOF_INVERT) {
a0ed51b3
LW
2305 for (value = 0; value < 32; ++value)
2306 opnd[1 + value] ^= 0xFF;
ae5c130c
GS
2307 *opnd = 0;
2308 }
a0d0e21e
LW
2309 return ret;
2310}
2311
a0ed51b3
LW
2312STATIC regnode *
2313regclassutf8(void)
2314{
2315 register char *opnd, *e;
2316 register U32 value;
2317 register U32 lastvalue = 123456;
2318 register I32 range = 0;
2319 register regnode *ret;
2320 I32 numlen;
2321 I32 n;
2322 SV *listsv;
2323 U8 flags = 0;
c485e607 2324 dTHR;
a0ed51b3
LW
2325
2326 if (*PL_regcomp_parse == '^') { /* Complement of range. */
2327 PL_regnaughty++;
2328 PL_regcomp_parse++;
2329 if (!SIZE_ONLY)
2330 flags |= ANYOF_INVERT;
2331 }
2332 if (!SIZE_ONLY) {
2333 if (FOLD)
2334 flags |= ANYOF_FOLD;
2335 if (LOC)
2336 flags |= ANYOF_LOCALE;
2337 listsv = newSVpv("# comment\n",0);
2338 }
2339
2340 if (*PL_regcomp_parse == ']' || *PL_regcomp_parse == '-')
2341 goto skipcond; /* allow 1st char to be ] or - */
2342
2343 while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != ']') {
2344 skipcond:
dfe13c55 2345 value = utf8_to_uv((U8*)PL_regcomp_parse, &numlen);
a0ed51b3
LW
2346 PL_regcomp_parse += numlen;
2347
2348 if (value == '[' && PL_regcomp_parse + 1 < PL_regxend &&
2349 /* I smell either [: or [= or [. -- POSIX has been here, right? */
2350 (*PL_regcomp_parse == ':' || *PL_regcomp_parse == '=' || *PL_regcomp_parse == '.')) {
2351 char posixccc = *PL_regcomp_parse;
2352 char* posixccs = PL_regcomp_parse++;
2353
2354 while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != posixccc)
2355 PL_regcomp_parse++;
2356 if (PL_regcomp_parse == PL_regxend)
2357 /* Grandfather lone [:, [=, [. */
2358 PL_regcomp_parse = posixccs;
2359 else {
2360 PL_regcomp_parse++; /* skip over the posixccc */
2361 if (*PL_regcomp_parse == ']') {
2362 /* Not Implemented Yet.
2363 * (POSIX Extended Character Classes, that is)
2364 * The text between e.g. [: and :] would start
2365 * at posixccs + 1 and stop at regcomp_parse - 2. */
599cee73
PM
2366 if (ckWARN(WARN_UNSAFE) && !SIZE_ONLY)
2367 warner(WARN_UNSAFE,
2368 "Character class syntax [%c %c] is reserved for future extensions", posixccc, posixccc);
a0ed51b3
LW
2369 PL_regcomp_parse++; /* skip over the ending ] */
2370 }
2371 }
2372 }
2373
2374 if (value == '\\') {
dfe13c55 2375 value = utf8_to_uv((U8*)PL_regcomp_parse, &numlen);
a0ed51b3
LW
2376 PL_regcomp_parse += numlen;
2377 switch (value) {
2378 case 'w':
2379 if (!SIZE_ONLY) {
2380 if (LOC)
2381 flags |= ANYOF_ALNUML;
2382
2383 sv_catpvf(listsv, "+utf8::IsAlnum\n");
2384 }
2385 lastvalue = 123456;
2386 continue;
2387 case 'W':
2388 if (!SIZE_ONLY) {
2389 if (LOC)
2390 flags |= ANYOF_NALNUML;
2391
2392 sv_catpvf(listsv,
2393 "-utf8::IsAlpha\n-utf8::IsDigit\n0000\t%04x\n%04x\tffff\n",
2394 '_' - 1,
2395 '_' + 1);
2396 }
2397 lastvalue = 123456;
2398 continue;
2399 case 's':
2400 if (!SIZE_ONLY) {
2401 if (LOC)
2402 flags |= ANYOF_SPACEL;
2403 sv_catpvf(listsv, "+utf8::IsSpace\n");
2404 if (!PL_utf8_space)
dfe13c55 2405 is_utf8_space((U8*)" ");
a0ed51b3
LW
2406 }
2407 lastvalue = 123456;
2408 continue;
2409 case 'S':
2410 if (!SIZE_ONLY) {
2411 if (LOC)
2412 flags |= ANYOF_NSPACEL;
2413 sv_catpvf(listsv,
2414 "!utf8::IsSpace\n");
2415 if (!PL_utf8_space)
dfe13c55 2416 is_utf8_space((U8*)" ");
a0ed51b3
LW
2417 }
2418 lastvalue = 123456;
2419 continue;
2420 case 'd':
2421 if (!SIZE_ONLY) {
2422 sv_catpvf(listsv, "+utf8::IsDigit\n");
2423 }
2424 lastvalue = 123456;
2425 continue;
2426 case 'D':
2427 if (!SIZE_ONLY) {
2428 sv_catpvf(listsv,
2429 "!utf8::IsDigit\n");
2430 }
2431 lastvalue = 123456;
2432 continue;
2433 case 'p':
2434 case 'P':
2435 if (*PL_regcomp_parse == '{') {
2436 e = strchr(PL_regcomp_parse++, '}');
2437 if (!e)
2438 FAIL("Missing right brace on \\p{}");
2439 n = e - PL_regcomp_parse;
2440 }
2441 else {
2442 e = PL_regcomp_parse;
2443 n = 1;
2444 }
2445 if (!SIZE_ONLY) {
2446 if (value == 'p')
2447 sv_catpvf(listsv, "+utf8::%.*s\n", n, PL_regcomp_parse);
2448 else
2449 sv_catpvf(listsv,
2450 "!utf8::%.*s\n", n, PL_regcomp_parse);
2451 }
2452 PL_regcomp_parse = e + 1;
2453 lastvalue = 123456;
2454 continue;
2455 case 'n':
2456 value = '\n';
2457 break;
2458 case 'r':
2459 value = '\r';
2460 break;
2461 case 't':
2462 value = '\t';
2463 break;
2464 case 'f':
2465 value = '\f';
2466 break;
2467 case 'b':
2468 value = '\b';
2469 break;
2470 case 'e':
2471 value = '\033';
2472 break;
2473 case 'a':
2474 value = '\007';
2475 break;
2476 case 'x':
2477 if (*PL_regcomp_parse == '{') {
2478 e = strchr(PL_regcomp_parse++, '}');
2479 if (!e)
2480 FAIL("Missing right brace on \\x{}");
2481 value = scan_hex(PL_regcomp_parse + 1, e - PL_regcomp_parse, &numlen);
2482 PL_regcomp_parse = e + 1;
2483 }
2484 else {
2485 value = scan_hex(PL_regcomp_parse, 2, &numlen);
2486 PL_regcomp_parse += numlen;
2487 }
2488 break;
2489 case 'c':
2490 value = UCHARAT(PL_regcomp_parse++);
2491 value = toCTRL(value);
2492 break;
2493 case '0': case '1': case '2': case '3': case '4':
2494 case '5': case '6': case '7': case '8': case '9':
2495 value = scan_oct(--PL_regcomp_parse, 3, &numlen);
2496 PL_regcomp_parse += numlen;
2497 break;
2498 }
2499 }
2500 if (range) {
2501 if (lastvalue > value)
2502 FAIL("invalid [] range in regexp");
2503 if (!SIZE_ONLY)
2504 sv_catpvf(listsv, "%04x\t%04x\n", lastvalue, value);
2505 lastvalue = value;
2506 range = 0;
2507 }
2508 else {
2509 lastvalue = value;
2510 if (*PL_regcomp_parse == '-' && PL_regcomp_parse+1 < PL_regxend &&
2511 PL_regcomp_parse[1] != ']') {
2512 PL_regcomp_parse++;
2513 range = 1;
2514 continue; /* do it next time */
2515 }
2516 if (!SIZE_ONLY)
2517 sv_catpvf(listsv, "%04x\n", value);
2518 }
2519 }
a0ed51b3
LW
2520
2521 ret = reganode(ANYOFUTF8, 0);
2522
2523 if (!SIZE_ONLY) {
2524 SV *rv = swash_init("utf8", "", listsv, 1, 0);
2525 SvREFCNT_dec(listsv);
2526 n = add_data(1,"s");
2527 PL_regcomp_rx->data->data[n] = (void*)rv;
2528 ARG1_SET(ret, flags);
2529 ARG2_SET(ret, n);
2530 }
2531
2532 return ret;
2533}
2534
76e3520e 2535STATIC char*
8ac85365 2536nextchar(void)
a0d0e21e 2537{
5c0ca799 2538 dTHR;
3280af22 2539 char* retval = PL_regcomp_parse++;
a0d0e21e 2540
4633a7c4 2541 for (;;) {
3280af22
NIS
2542 if (*PL_regcomp_parse == '(' && PL_regcomp_parse[1] == '?' &&
2543 PL_regcomp_parse[2] == '#') {
2544 while (*PL_regcomp_parse && *PL_regcomp_parse != ')')
2545 PL_regcomp_parse++;
2546 PL_regcomp_parse++;
4633a7c4
LW
2547 continue;
2548 }
3280af22
NIS
2549 if (PL_regflags & PMf_EXTENDED) {
2550 if (isSPACE(*PL_regcomp_parse)) {
2551 PL_regcomp_parse++;
748a9306
LW
2552 continue;
2553 }
3280af22
NIS
2554 else if (*PL_regcomp_parse == '#') {
2555 while (*PL_regcomp_parse && *PL_regcomp_parse != '\n')
2556 PL_regcomp_parse++;
2557 PL_regcomp_parse++;
748a9306
LW
2558 continue;
2559 }
748a9306 2560 }
4633a7c4 2561 return retval;
a0d0e21e 2562 }
a687059c
LW
2563}
2564
2565/*
c277df42 2566- reg_node - emit a node
a0d0e21e 2567*/
76e3520e 2568STATIC regnode * /* Location. */
c277df42 2569reg_node(U8 op)
a687059c 2570{
5c0ca799 2571 dTHR;
c277df42
IZ
2572 register regnode *ret;
2573 register regnode *ptr;
a687059c 2574
3280af22 2575 ret = PL_regcode;
c277df42 2576 if (SIZE_ONLY) {
6b88bc9c 2577 SIZE_ALIGN(PL_regsize);
3280af22 2578 PL_regsize += 1;
a0d0e21e
LW
2579 return(ret);
2580 }
a687059c 2581
c277df42 2582 NODE_ALIGN_FILL(ret);
a0d0e21e 2583 ptr = ret;
c277df42 2584 FILL_ADVANCE_NODE(ptr, op);
3280af22 2585 PL_regcode = ptr;
a687059c 2586
a0d0e21e 2587 return(ret);
a687059c
LW
2588}
2589
2590/*
a0d0e21e
LW
2591- reganode - emit a node with an argument
2592*/
76e3520e 2593STATIC regnode * /* Location. */
c277df42 2594reganode(U8 op, U32 arg)
fe14fcc3 2595{
5c0ca799 2596 dTHR;
c277df42
IZ
2597 register regnode *ret;
2598 register regnode *ptr;
fe14fcc3 2599
3280af22 2600 ret = PL_regcode;
c277df42 2601 if (SIZE_ONLY) {
6b88bc9c 2602 SIZE_ALIGN(PL_regsize);
3280af22 2603 PL_regsize += 2;
a0d0e21e
LW
2604 return(ret);
2605 }
fe14fcc3 2606
c277df42 2607 NODE_ALIGN_FILL(ret);
a0d0e21e 2608 ptr = ret;
c277df42 2609 FILL_ADVANCE_NODE_ARG(ptr, op, arg);
3280af22 2610 PL_regcode = ptr;
fe14fcc3 2611
a0d0e21e 2612 return(ret);
fe14fcc3
LW
2613}
2614
2615/*
a0ed51b3
LW
2616- regc - emit (if appropriate) a Unicode character
2617*/
2618STATIC void
2619reguni(UV uv, char* s, I32* lenp)
2620{
c485e607 2621 dTHR;
a0ed51b3 2622 if (SIZE_ONLY) {
dfe13c55 2623 U8 tmpbuf[10];
a0ed51b3
LW
2624 *lenp = uv_to_utf8(tmpbuf, uv) - tmpbuf;
2625 }
2626 else
dfe13c55 2627 *lenp = uv_to_utf8((U8*)s, uv) - (U8*)s;
a0ed51b3
LW
2628
2629}
2630
2631/*
a0d0e21e
LW
2632- regc - emit (if appropriate) a byte of code
2633*/
76e3520e 2634STATIC void
c277df42 2635regc(U8 b, char* s)
a687059c 2636{
5c0ca799 2637 dTHR;
c277df42
IZ
2638 if (!SIZE_ONLY)
2639 *s = b;
a687059c
LW
2640}
2641
2642/*
a0d0e21e
LW
2643- reginsert - insert an operator in front of already-emitted operand
2644*
2645* Means relocating the operand.
2646*/
76e3520e 2647STATIC void
c277df42 2648reginsert(U8 op, regnode *opnd)
a687059c 2649{
5c0ca799 2650 dTHR;
c277df42
IZ
2651 register regnode *src;
2652 register regnode *dst;
2653 register regnode *place;
2654 register int offset = regarglen[(U8)op];
2655
2656/* (regkind[(U8)op] == CURLY ? EXTRA_STEP_2ARGS : 0); */
2657
2658 if (SIZE_ONLY) {
3280af22 2659 PL_regsize += NODE_STEP_REGNODE + offset;
a0d0e21e
LW
2660 return;
2661 }
a687059c 2662
3280af22
NIS
2663 src = PL_regcode;
2664 PL_regcode += NODE_STEP_REGNODE + offset;
2665 dst = PL_regcode;
a0d0e21e 2666 while (src > opnd)
c277df42 2667 StructCopy(--src, --dst, regnode);
a0d0e21e
LW
2668
2669 place = opnd; /* Op node, where operand used to be. */
c277df42
IZ
2670 src = NEXTOPER(place);
2671 FILL_ADVANCE_NODE(place, op);
2672 Zero(src, offset, regnode);
a687059c
LW
2673}
2674
2675/*
c277df42 2676- regtail - set the next-pointer at the end of a node chain of p to val.
a0d0e21e 2677*/
76e3520e 2678STATIC void
c277df42 2679regtail(regnode *p, regnode *val)
a687059c 2680{
5c0ca799 2681 dTHR;
c277df42
IZ
2682 register regnode *scan;
2683 register regnode *temp;
a0d0e21e
LW
2684 register I32 offset;
2685
c277df42 2686 if (SIZE_ONLY)
a0d0e21e
LW
2687 return;
2688
2689 /* Find last node. */
2690 scan = p;
2691 for (;;) {
2692 temp = regnext(scan);
2693 if (temp == NULL)
2694 break;
2695 scan = temp;
2696 }
a687059c 2697
c277df42
IZ
2698 if (reg_off_by_arg[OP(scan)]) {
2699 ARG_SET(scan, val - scan);
a0ed51b3
LW
2700 }
2701 else {
c277df42
IZ
2702 NEXT_OFF(scan) = val - scan;
2703 }
a687059c
LW
2704}
2705
2706/*
a0d0e21e
LW
2707- regoptail - regtail on operand of first argument; nop if operandless
2708*/
76e3520e 2709STATIC void
c277df42 2710regoptail(regnode *p, regnode *val)
a687059c 2711{
5c0ca799 2712 dTHR;
a0d0e21e 2713 /* "Operandless" and "op != BRANCH" are synonymous in practice. */
c277df42
IZ
2714 if (p == NULL || SIZE_ONLY)
2715 return;
2716 if (regkind[(U8)OP(p)] == BRANCH) {
2717 regtail(NEXTOPER(p), val);
a0ed51b3
LW
2718 }
2719 else if ( regkind[(U8)OP(p)] == BRANCHJ) {
c277df42 2720 regtail(NEXTOPER(NEXTOPER(p)), val);
a0ed51b3
LW
2721 }
2722 else
a0d0e21e 2723 return;
a687059c
LW
2724}
2725
2726/*
2727 - regcurly - a little FSA that accepts {\d+,?\d*}
2728 */
79072805 2729STATIC I32
8ac85365 2730regcurly(register char *s)
a687059c
LW
2731{
2732 if (*s++ != '{')
2733 return FALSE;
f0fcb552 2734 if (!isDIGIT(*s))
a687059c 2735 return FALSE;
f0fcb552 2736 while (isDIGIT(*s))
a687059c
LW
2737 s++;
2738 if (*s == ',')
2739 s++;
f0fcb552 2740 while (isDIGIT(*s))
a687059c
LW
2741 s++;
2742 if (*s != '}')
2743 return FALSE;
2744 return TRUE;
2745}
2746
a687059c 2747
76e3520e 2748STATIC regnode *
c277df42
IZ
2749dumpuntil(regnode *start, regnode *node, regnode *last, SV* sv, I32 l)
2750{
35ff7856 2751#ifdef DEBUGGING
c277df42
IZ
2752 register char op = EXACT; /* Arbitrary non-END op. */
2753 register regnode *next, *onode;
2754
2755 while (op != END && (!last || node < last)) {
2756 /* While that wasn't END last time... */
2757
2758 NODE_ALIGN(node);
2759 op = OP(node);
2760 if (op == CLOSE)
2761 l--;
2762 next = regnext(node);
2763 /* Where, what. */
2764 if (OP(node) == OPTIMIZED)
2765 goto after_print;
2766 regprop(sv, node);
54dc92de 2767 PerlIO_printf(Perl_debug_log, "%4d:%*s%s", node - start,
c277df42
IZ
2768 2*l + 1, "", SvPVX(sv));
2769 if (next == NULL) /* Next ptr. */
2770 PerlIO_printf(Perl_debug_log, "(0)");
2771 else
2772 PerlIO_printf(Perl_debug_log, "(%d)", next - start);
2773 (void)PerlIO_putc(Perl_debug_log, '\n');
2774 after_print:
2775 if (regkind[(U8)op] == BRANCHJ) {
2776 register regnode *nnode = (OP(next) == LONGJMP
2777 ? regnext(next)
2778 : next);
2779 if (last && nnode > last)
2780 nnode = last;
2781 node = dumpuntil(start, NEXTOPER(NEXTOPER(node)), nnode, sv, l + 1);
a0ed51b3
LW
2782 }
2783 else if (regkind[(U8)op] == BRANCH) {
c277df42 2784 node = dumpuntil(start, NEXTOPER(node), next, sv, l + 1);
a0ed51b3
LW
2785 }
2786 else if ( op == CURLY) { /* `next' might be very big: optimizer */
c277df42
IZ
2787 node = dumpuntil(start, NEXTOPER(node) + EXTRA_STEP_2ARGS,
2788 NEXTOPER(node) + EXTRA_STEP_2ARGS + 1, sv, l + 1);
a0ed51b3
LW
2789 }
2790 else if (regkind[(U8)op] == CURLY && op != CURLYX) {
c277df42
IZ
2791 node = dumpuntil(start, NEXTOPER(node) + EXTRA_STEP_2ARGS,
2792 next, sv, l + 1);
a0ed51b3
LW
2793 }
2794 else if ( op == PLUS || op == STAR) {
c277df42 2795 node = dumpuntil(start, NEXTOPER(node), NEXTOPER(node) + 1, sv, l + 1);
a0ed51b3
LW
2796 }
2797 else if (op == ANYOF) {
c277df42
IZ
2798 node = NEXTOPER(node);
2799 node += ANY_SKIP;
a0ed51b3
LW
2800 }
2801 else if (regkind[(U8)op] == EXACT) {
c277df42
IZ
2802 /* Literal string, where present. */
2803 node += ((*OPERAND(node)) + 2 + sizeof(regnode) - 1) / sizeof(regnode);
2804 node = NEXTOPER(node);
a0ed51b3
LW
2805 }
2806 else {
c277df42
IZ
2807 node = NEXTOPER(node);
2808 node += regarglen[(U8)op];
2809 }
2810 if (op == CURLYX || op == OPEN)
2811 l++;
2812 else if (op == WHILEM)
2813 l--;
2814 }
17c3b450 2815#endif /* DEBUGGING */
c277df42
IZ
2816 return node;
2817}
2818
a687059c 2819/*
fd181c75 2820 - regdump - dump a regexp onto Perl_debug_log in vaguely comprehensible form
a687059c
LW
2821 */
2822void
8ac85365 2823regdump(regexp *r)
a687059c 2824{
35ff7856 2825#ifdef DEBUGGING
5c0ca799 2826 dTHR;
46fc3d4c 2827 SV *sv = sv_newmortal();
a687059c 2828
c277df42 2829 (void)dumpuntil(r->program, r->program + 1, NULL, sv, 0);
a0d0e21e
LW
2830
2831 /* Header fields of interest. */
c277df42
IZ
2832 if (r->anchored_substr)
2833 PerlIO_printf(Perl_debug_log, "anchored `%s%s%s'%s at %d ",
3280af22 2834 PL_colors[0],
c277df42 2835 SvPVX(r->anchored_substr),
3280af22 2836 PL_colors[1],
c277df42
IZ
2837 SvTAIL(r->anchored_substr) ? "$" : "",
2838 r->anchored_offset);
2839 if (r->float_substr)
2840 PerlIO_printf(Perl_debug_log, "floating `%s%s%s'%s at %d..%u ",
3280af22 2841 PL_colors[0],
c277df42 2842 SvPVX(r->float_substr),
3280af22 2843 PL_colors[1],
c277df42
IZ
2844 SvTAIL(r->float_substr) ? "$" : "",
2845 r->float_min_offset, r->float_max_offset);
2846 if (r->check_substr)
2847 PerlIO_printf(Perl_debug_log,
2848 r->check_substr == r->float_substr
2849 ? "(checking floating" : "(checking anchored");
2850 if (r->reganch & ROPT_NOSCAN)
2851 PerlIO_printf(Perl_debug_log, " noscan");
2852 if (r->reganch & ROPT_CHECK_ALL)
2853 PerlIO_printf(Perl_debug_log, " isall");
2854 if (r->check_substr)
2855 PerlIO_printf(Perl_debug_log, ") ");
2856
46fc3d4c
PP
2857 if (r->regstclass) {
2858 regprop(sv, r->regstclass);
2859 PerlIO_printf(Perl_debug_log, "stclass `%s' ", SvPVX(sv));
2860 }
774d564b
PP
2861 if (r->reganch & ROPT_ANCH) {
2862 PerlIO_printf(Perl_debug_log, "anchored");
2863 if (r->reganch & ROPT_ANCH_BOL)
2864 PerlIO_printf(Perl_debug_log, "(BOL)");
c277df42
IZ
2865 if (r->reganch & ROPT_ANCH_MBOL)
2866 PerlIO_printf(Perl_debug_log, "(MBOL)");
774d564b
PP
2867 if (r->reganch & ROPT_ANCH_GPOS)
2868 PerlIO_printf(Perl_debug_log, "(GPOS)");
2869 PerlIO_putc(Perl_debug_log, ' ');
2870 }
c277df42
IZ
2871 if (r->reganch & ROPT_GPOS_SEEN)
2872 PerlIO_printf(Perl_debug_log, "GPOS ");
a0d0e21e 2873 if (r->reganch & ROPT_SKIP)
760ac839 2874 PerlIO_printf(Perl_debug_log, "plus ");
a0d0e21e 2875 if (r->reganch & ROPT_IMPLICIT)
760ac839 2876 PerlIO_printf(Perl_debug_log, "implicit ");
760ac839 2877 PerlIO_printf(Perl_debug_log, "minlen %ld ", (long) r->minlen);
ce862d02
IZ
2878 if (r->reganch & ROPT_EVAL_SEEN)
2879 PerlIO_printf(Perl_debug_log, "with eval ");
760ac839 2880 PerlIO_printf(Perl_debug_log, "\n");
17c3b450 2881#endif /* DEBUGGING */
a687059c
LW
2882}
2883
2884/*
a0d0e21e
LW
2885- regprop - printable representation of opcode
2886*/
46fc3d4c 2887void
c277df42 2888regprop(SV *sv, regnode *o)
a687059c 2889{
35ff7856 2890#ifdef DEBUGGING
5c0ca799 2891 dTHR;
a0d0e21e
LW
2892 register char *p = 0;
2893
54dc92de 2894 sv_setpvn(sv, "", 0);
11343788 2895 switch (OP(o)) {
a0d0e21e
LW
2896 case BOL:
2897 p = "BOL";
2898 break;
2899 case MBOL:
2900 p = "MBOL";
2901 break;
2902 case SBOL:
2903 p = "SBOL";
2904 break;
2905 case EOL:
2906 p = "EOL";
2907 break;
b85d18e9
IZ
2908 case EOS:
2909 p = "EOS";
2910 break;
a0d0e21e
LW
2911 case MEOL:
2912 p = "MEOL";
2913 break;
2914 case SEOL:
2915 p = "SEOL";
2916 break;
2917 case ANY:
2918 p = "ANY";
2919 break;
2920 case SANY:
2921 p = "SANY";
2922 break;
a0ed51b3
LW
2923 case ANYUTF8:
2924 p = "ANYUTF8";
2925 break;
2926 case SANYUTF8:
2927 p = "SANYUTF8";
2928 break;
2929 case ANYOFUTF8:
2930 p = "ANYOFUTF8";
2931 break;
a0d0e21e
LW
2932 case ANYOF:
2933 p = "ANYOF";
2934 break;
2935 case BRANCH:
2936 p = "BRANCH";
2937 break;
bbce6d69 2938 case EXACT:
3280af22 2939 sv_catpvf(sv, "EXACT <%s%s%s>", PL_colors[0], OPERAND(o) + 1, PL_colors[1]);
bbce6d69
PP
2940 break;
2941 case EXACTF:
3280af22 2942 sv_catpvf(sv, "EXACTF <%s%s%s>", PL_colors[0], OPERAND(o) + 1, PL_colors[1]);
bbce6d69
PP
2943 break;
2944 case EXACTFL:
3280af22 2945 sv_catpvf(sv, "EXACTFL <%s%s%s>", PL_colors[0], OPERAND(o) + 1, PL_colors[1]);
a0d0e21e
LW
2946 break;
2947 case NOTHING:
2948 p = "NOTHING";
2949 break;
c277df42
IZ
2950 case TAIL:
2951 p = "TAIL";
2952 break;
a0d0e21e
LW
2953 case BACK:
2954 p = "BACK";
2955 break;
2956 case END:
2957 p = "END";
2958 break;
a0d0e21e
LW
2959 case BOUND:
2960 p = "BOUND";
2961 break;
bbce6d69
PP
2962 case BOUNDL:
2963 p = "BOUNDL";
2964 break;
a0d0e21e
LW
2965 case NBOUND:
2966 p = "NBOUND";
2967 break;
bbce6d69
PP
2968 case NBOUNDL:
2969 p = "NBOUNDL";
a0d0e21e
LW
2970 break;
2971 case CURLY:
5dc0d613 2972 sv_catpvf(sv, "CURLY {%d,%d}", ARG1(o), ARG2(o));
a0d0e21e 2973 break;
c277df42 2974 case CURLYM:
c277df42 2975 sv_catpvf(sv, "CURLYM[%d] {%d,%d}", o->flags, ARG1(o), ARG2(o));
c277df42
IZ
2976 break;
2977 case CURLYN:
c277df42 2978 sv_catpvf(sv, "CURLYN[%d] {%d,%d}", o->flags, ARG1(o), ARG2(o));
c277df42 2979 break;
a0d0e21e 2980 case CURLYX:
5dc0d613 2981 sv_catpvf(sv, "CURLYX {%d,%d}", ARG1(o), ARG2(o));
a0d0e21e
LW
2982 break;
2983 case REF:
c277df42 2984 sv_catpvf(sv, "REF%d", ARG(o));
a0d0e21e 2985 break;
c8756f30 2986 case REFF:
c277df42 2987 sv_catpvf(sv, "REFF%d", ARG(o));
c8756f30
AK
2988 break;
2989 case REFFL:
c277df42 2990 sv_catpvf(sv, "REFFL%d", ARG(o));
c8756f30 2991 break;
a0d0e21e 2992 case OPEN:
c277df42 2993 sv_catpvf(sv, "OPEN%d", ARG(o));
a0d0e21e
LW
2994 break;
2995 case CLOSE:
c277df42 2996 sv_catpvf(sv, "CLOSE%d", ARG(o));
a0d0e21e
LW
2997 p = NULL;
2998 break;
2999 case STAR:
3000 p = "STAR";
3001 break;
3002 case PLUS:
3003 p = "PLUS";
3004 break;
3005 case MINMOD:
3006 p = "MINMOD";
3007 break;
774d564b
PP
3008 case GPOS:
3009 p = "GPOS";
a0d0e21e
LW
3010 break;
3011 case UNLESSM:
c277df42 3012 sv_catpvf(sv, "UNLESSM[-%d]", o->flags);
a0d0e21e
LW
3013 break;
3014 case IFMATCH:
c277df42 3015 sv_catpvf(sv, "IFMATCH[-%d]", o->flags);
a0d0e21e
LW
3016 break;
3017 case SUCCEED:
3018 p = "SUCCEED";
3019 break;
3020 case WHILEM:
3021 p = "WHILEM";
3022 break;
bbce6d69
PP
3023 case DIGIT:
3024 p = "DIGIT";
3025 break;
3026 case NDIGIT:
3027 p = "NDIGIT";
3028 break;
3029 case ALNUM:
3030 p = "ALNUM";
3031 break;
3032 case NALNUM:
3033 p = "NALNUM";
3034 break;
3035 case SPACE:
3036 p = "SPACE";
3037 break;
3038 case NSPACE:
3039 p = "NSPACE";
3040 break;
3041 case ALNUML:
3042 p = "ALNUML";
3043 break;
3044 case NALNUML:
3045 p = "NALNUML";
3046 break;
3047 case SPACEL:
3048 p = "SPACEL";
3049 break;
3050 case NSPACEL:
3051 p = "NSPACEL";
3052 break;
c277df42
IZ
3053 case EVAL:
3054 p = "EVAL";
3055 break;
3056 case LONGJMP:
3057 p = "LONGJMP";
3058 break;
3059 case BRANCHJ:
3060 p = "BRANCHJ";
3061 break;
3062 case IFTHEN:
3063 p = "IFTHEN";
3064 break;
3065 case GROUPP:
3066 sv_catpvf(sv, "GROUPP%d", ARG(o));
3067 break;
3068 case LOGICAL:
0f5d15d6 3069 sv_catpvf(sv, "LOGICAL[%d]", o->flags);
c277df42
IZ
3070 break;
3071 case SUSPEND:
3072 p = "SUSPEND";
3073 break;
3074 case RENUM:
3075 p = "RENUM";
3076 break;
3077 case OPTIMIZED:
3078 p = "OPTIMIZED";
3079 break;
a0d0e21e
LW
3080 default:
3081 FAIL("corrupted regexp opcode");
3082 }
46fc3d4c
PP
3083 if (p)
3084 sv_catpv(sv, p);
17c3b450 3085#endif /* DEBUGGING */
35ff7856 3086}
a687059c 3087
2b69d0c2 3088void
8ac85365 3089pregfree(struct regexp *r)
a687059c 3090{
5c0ca799 3091 dTHR;
c277df42 3092 if (!r || (--r->refcnt > 0))
a0d0e21e 3093 return;
c277df42 3094 if (r->precomp)
a0d0e21e 3095 Safefree(r->precomp);
c277df42 3096 if (r->subbase)
a0d0e21e 3097 Safefree(r->subbase);
a193d654
GS
3098 if (r->substrs) {
3099 if (r->anchored_substr)
3100 SvREFCNT_dec(r->anchored_substr);
3101 if (r->float_substr)
3102 SvREFCNT_dec(r->float_substr);
2779dcf1 3103 Safefree(r->substrs);
a193d654 3104 }
c277df42
IZ
3105 if (r->data) {
3106 int n = r->data->count;
3107 while (--n >= 0) {
3108 switch (r->data->what[n]) {
3109 case 's':
3110 SvREFCNT_dec((SV*)r->data->data[n]);
3111 break;
3112 case 'o':
3113 op_free((OP_4tree*)r->data->data[n]);
3114 break;
3115 case 'n':
3116 break;
3117 default:
3118 FAIL2("panic: regfree data code '%c'", r->data->what[n]);
3119 }
3120 }
3121 Safefree(r->data->what);
3122 Safefree(r->data);
a0d0e21e
LW
3123 }
3124 Safefree(r->startp);
3125 Safefree(r->endp);
3126 Safefree(r);
a687059c 3127}
c277df42
IZ
3128
3129/*
3130 - regnext - dig the "next" pointer out of a node
3131 *
3132 * [Note, when REGALIGN is defined there are two places in regmatch()
3133 * that bypass this code for speed.]
3134 */
3135regnode *
3136regnext(register regnode *p)
3137{
5c0ca799 3138 dTHR;
c277df42
IZ
3139 register I32 offset;
3140
3280af22 3141 if (p == &PL_regdummy)
c277df42
IZ
3142 return(NULL);
3143
3144 offset = (reg_off_by_arg[OP(p)] ? ARG(p) : NEXT_OFF(p));
3145 if (offset == 0)
3146 return(NULL);
3147
c277df42 3148 return(p+offset);
c277df42
IZ
3149}
3150
01f988be 3151STATIC void
c277df42 3152re_croak2(const char* pat1,const char* pat2,...)
c277df42
IZ
3153{
3154 va_list args;
3155 STRLEN l1 = strlen(pat1);
3156 STRLEN l2 = strlen(pat2);
3157 char buf[512];
3158 char *message;
3159
3160 if (l1 > 510)
3161 l1 = 510;
3162 if (l1 + l2 > 510)
3163 l2 = 510 - l1;
3164 Copy(pat1, buf, l1 , char);
3165 Copy(pat2, buf + l1, l2 , char);
3b818b81
GS
3166 buf[l1 + l2] = '\n';
3167 buf[l1 + l2 + 1] = '\0';
c277df42 3168 va_start(args, pat2);
c277df42
IZ
3169 message = mess(buf, &args);
3170 va_end(args);
3171 l1 = strlen(message);
3172 if (l1 > 512)
3173 l1 = 512;
3174 Copy(message, buf, l1 , char);
3175 buf[l1] = '\0'; /* Overwrite \n */
3176 croak("%s", buf);
3177}
a0ed51b3
LW
3178
3179/* XXX Here's a total kludge. But we need to re-enter for swash routines. */
3180
3181void
3182save_re_context(void)
c485e607
NIS
3183{
3184 dTHR;
a0ed51b3
LW
3185 SAVEPPTR(PL_bostr);
3186 SAVEPPTR(PL_regprecomp); /* uncompiled string. */
3187 SAVEI32(PL_regnpar); /* () count. */
3188 SAVEI32(PL_regsize); /* Code size. */
3189 SAVEI16(PL_regflags); /* are we folding, multilining? */
3190 SAVEPPTR(PL_reginput); /* String-input pointer. */
3191 SAVEPPTR(PL_regbol); /* Beginning of input, for ^ check. */
3192 SAVEPPTR(PL_regeol); /* End of input, for $ check. */
3193 SAVESPTR(PL_regstartp); /* Pointer to startp array. */
3194 SAVESPTR(PL_regendp); /* Ditto for endp. */
3195 SAVESPTR(PL_reglastparen); /* Similarly for lastparen. */
3196 SAVEPPTR(PL_regtill); /* How far we are required to go. */
3197 SAVEI32(PL_regprev); /* char before regbol, \n if none */
3198 SAVESPTR(PL_reg_start_tmp); /* from regexec.c */
3199 PL_reg_start_tmp = 0;
3200 SAVEFREEPV(PL_reg_start_tmp);
3201 SAVEI32(PL_reg_start_tmpl); /* from regexec.c */
3202 PL_reg_start_tmpl = 0;
3203 SAVESPTR(PL_regdata);
3204 SAVEI32(PL_reg_flags); /* from regexec.c */
3205 SAVEI32(PL_reg_eval_set); /* from regexec.c */
3206 SAVEI32(PL_regnarrate); /* from regexec.c */
3207 SAVESPTR(PL_regprogram); /* from regexec.c */
3208 SAVEINT(PL_regindent); /* from regexec.c */
3209 SAVESPTR(PL_regcc); /* from regexec.c */
3210 SAVESPTR(PL_curcop);
3211 SAVESPTR(PL_regcomp_rx); /* from regcomp.c */
3212 SAVEI32(PL_regseen); /* from regcomp.c */
3213 SAVEI32(PL_regsawback); /* Did we see \1, ...? */
3214 SAVEI32(PL_regnaughty); /* How bad is this pattern? */
3215 SAVESPTR(PL_regcode); /* Code-emit pointer; &regdummy = don't */
3216 SAVEPPTR(PL_regxend); /* End of input for compile */
3217 SAVEPPTR(PL_regcomp_parse); /* Input-scan pointer. */
3218}