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a0d0e21e 1/* regexp.h
d6376244 2 *
4bb101f2 3 * Copyright (C) 1993, 1994, 1996, 1997, 1999, 2000, 2001, 2003,
1129b882 4 * 2005, 2006, 2007, 2008 by Larry Wall and others
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5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
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9 */
10
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11/*
12 * Definitions etc. for regexp(3) routines.
13 *
14 * Caveat: this is V8 regexp(3) [actually, a reimplementation thereof],
15 * not the System V one.
16 */
be8e71aa 17#ifndef PLUGGABLE_RE_EXTENSION
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18/* we don't want to include this stuff if we are inside of
19 an external regex engine based on the core one - like re 'debug'*/
378cc40b 20
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21#include "utf8.h"
22
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23struct regnode {
24 U8 flags;
25 U8 type;
26 U16 next_off;
27};
28
29typedef struct regnode regnode;
30
cad2e5aa 31struct reg_substr_data;
2779dcf1 32
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33struct reg_data;
34
f9f4320a 35struct regexp_engine;
28d8d7f4 36struct regexp;
bbe252da 37
785a26d5 38struct reg_substr_datum {
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39 SSize_t min_offset; /* min pos (in chars) that substr must appear */
40 SSize_t max_offset /* max pos (in chars) that substr must appear */;
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41 SV *substr; /* non-utf8 variant */
42 SV *utf8_substr; /* utf8 variant */
c4828ca0 43 SSize_t end_shift; /* how many fixed chars must end the string */
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44};
45struct reg_substr_data {
6480a6c4 46 U8 check_ix; /* index into data[] of check substr */
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47 struct reg_substr_datum data[3]; /* Actual array */
48};
f9f4320a 49
db2c6cb3 50#ifdef PERL_ANY_COW
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51#define SV_SAVED_COPY SV *saved_copy; /* If non-NULL, SV which is COW from original */
52#else
53#define SV_SAVED_COPY
ed252734 54#endif
28d8d7f4 55
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56/* offsets within a string of a particular /(.)/ capture */
57
f0ab9afb 58typedef struct regexp_paren_pair {
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59 SSize_t start;
60 SSize_t end;
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61 /* 'start_tmp' records a new opening position before the matching end
62 * has been found, so that the old start and end values are still
63 * valid, e.g.
64 * "abc" =~ /(.(?{print "[$1]"}))+/
65 *outputs [][a][b]
66 * This field is not part of the API. */
ea3daa5d 67 SSize_t start_tmp;
f0ab9afb 68} regexp_paren_pair;
28d8d7f4 69
52ae8f7e 70#if defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_UTF8_C)
164173a2 71#define _invlist_union(a, b, output) _invlist_union_maybe_complement_2nd(a, b, FALSE, output)
52ae8f7e 72#define _invlist_intersection(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, FALSE, output)
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73
74/* Subtracting b from a leaves in a everything that was there that isn't in b,
75 * that is the intersection of a with b's complement */
76#define _invlist_subtract(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, TRUE, output)
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77#endif
78
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79/* record the position of a (?{...}) within a pattern */
80
81struct reg_code_block {
82 STRLEN start;
83 STRLEN end;
84 OP *block;
b30fcab9 85 REGEXP *src_regex;
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86};
87
88
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89/*
90 The regexp/REGEXP struct, see L<perlreapi> for further documentation
91 on the individual fields. The struct is ordered so that the most
92 commonly used fields are placed at the start.
93
94 Any patch that adds items to this struct will need to include
95 changes to F<sv.c> (C<Perl_re_dup()>) and F<regcomp.c>
96 (C<pregfree()>). This involves freeing or cloning items in the
97 regexp's data array based on the data item's type.
98*/
99
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100#define _REGEXP_COMMON \
101 /* what engine created this regexp? */ \
102 const struct regexp_engine* engine; \
103 REGEXP *mother_re; /* what re is this a lightweight copy of? */ \
89f6f287 104 HV *paren_names; /* Optional hash of paren names */ \
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105 /* Information about the match that the perl core uses to */ \
106 /* manage things */ \
107 U32 extflags; /* Flags used both externally and internally */ \
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108 SSize_t minlen; /* mininum possible number of chars in string to match */\
109 SSize_t minlenret; /* mininum possible number of chars in $& */ \
110 STRLEN gofs; /* chars left of pos that we search from */ \
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111 /* substring data about strings that must appear in the */ \
112 /* final match, used for optimisations */ \
113 struct reg_substr_data *substrs; \
114 U32 nparens; /* number of capture buffers */ \
115 /* private engine specific data */ \
116 U32 intflags; /* Engine Specific Internal flags */ \
117 void *pprivate; /* Data private to the regex engine which */ \
118 /* created this object. */ \
119 /* Data about the last/current match. These are modified */ \
120 /* during matching */ \
121 U32 lastparen; /* last open paren matched */ \
122 U32 lastcloseparen; /* last close paren matched */ \
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123 /* Array of offsets for (@-) and (@+) */ \
124 regexp_paren_pair *offs; \
125 /* saved or original string so \digit works forever. */ \
126 char *subbeg; \
127 SV_SAVED_COPY /* If non-NULL, SV which is COW from original */\
19394178 128 SSize_t sublen; /* Length of string pointed by subbeg */ \
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129 SSize_t suboffset; /* byte offset of subbeg from logical start of str */ \
130 SSize_t subcoffset; /* suboffset equiv, but in chars (for @-/@+) */ \
08e44740 131 /* Information about the match that isn't often used */ \
ee273784 132 SSize_t maxlen; /* mininum possible number of chars in string to match */\
08e44740 133 /* offset from wrapped to the start of precomp */ \
654eccd5 134 PERL_BITFIELD32 pre_prefix:4; \
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135 /* original flags used to compile the pattern, may differ */ \
136 /* from extflags in various ways */ \
137 PERL_BITFIELD32 compflags:9; \
b82ad30c 138 CV *qr_anoncv /* the anon sub wrapped round qr/(?{..})/ */
08e44740 139
bbe252da 140typedef struct regexp {
288b8c02 141 _XPV_HEAD;
08e44740 142 _REGEXP_COMMON;
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143} regexp;
144
89f6f287 145#define RXp_PAREN_NAMES(rx) ((rx)->paren_names)
5daac39c 146
785a26d5 147/* used for high speed searches */
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148typedef struct re_scream_pos_data_s
149{
150 char **scream_olds; /* match pos */
ea3daa5d 151 SSize_t *scream_pos; /* Internal iterator of scream. */
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152} re_scream_pos_data;
153
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154/* regexp_engine structure. This is the dispatch table for regexes.
155 * Any regex engine implementation must be able to build one of these.
156 */
f9f4320a 157typedef struct regexp_engine {
1593ad57 158 REGEXP* (*comp) (pTHX_ SV * const pattern, U32 flags);
49d7dfbc 159 I32 (*exec) (pTHX_ REGEXP * const rx, char* stringarg, char* strend,
ea3daa5d 160 char* strbeg, SSize_t minend, SV* sv,
49d7dfbc 161 void* data, U32 flags);
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162 char* (*intuit) (pTHX_
163 REGEXP * const rx,
164 SV *sv,
165 const char * const strbeg,
166 char *strpos,
167 char *strend,
168 const U32 flags,
9f61653a 169 re_scream_pos_data *data);
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170 SV* (*checkstr) (pTHX_ REGEXP * const rx);
171 void (*free) (pTHX_ REGEXP * const rx);
2fdbfb4d 172 void (*numbered_buff_FETCH) (pTHX_ REGEXP * const rx, const I32 paren,
192b9cd1 173 SV * const sv);
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174 void (*numbered_buff_STORE) (pTHX_ REGEXP * const rx, const I32 paren,
175 SV const * const value);
176 I32 (*numbered_buff_LENGTH) (pTHX_ REGEXP * const rx, const SV * const sv,
177 const I32 paren);
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178 SV* (*named_buff) (pTHX_ REGEXP * const rx, SV * const key,
179 SV * const value, const U32 flags);
180 SV* (*named_buff_iter) (pTHX_ REGEXP * const rx, const SV * const lastkey,
181 const U32 flags);
49d7dfbc 182 SV* (*qr_package)(pTHX_ REGEXP * const rx);
f2f78491 183#ifdef USE_ITHREADS
49d7dfbc 184 void* (*dupe) (pTHX_ REGEXP * const rx, CLONE_PARAMS *param);
2fdbfb4d 185#endif
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186 REGEXP* (*op_comp) (pTHX_ SV ** const patternp, int pat_count,
187 OP *expr, const struct regexp_engine* eng,
188 REGEXP *VOL old_re,
76ac488f 189 bool *is_bare_re, U32 orig_rx_flags, U32 pm_flags);
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190} regexp_engine;
191
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192/*
193 These are passed to the numbered capture variable callbacks as the
194 paren name. >= 1 is reserved for actual numbered captures, i.e. $1,
195 $2 etc.
196*/
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197#define RX_BUFF_IDX_CARET_PREMATCH -5 /* ${^PREMATCH} */
198#define RX_BUFF_IDX_CARET_POSTMATCH -4 /* ${^POSTMATCH} */
199#define RX_BUFF_IDX_CARET_FULLMATCH -3 /* ${^MATCH} */
200#define RX_BUFF_IDX_PREMATCH -2 /* $` */
201#define RX_BUFF_IDX_POSTMATCH -1 /* $' */
202#define RX_BUFF_IDX_FULLMATCH 0 /* $& */
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203
204/*
205 Flags that are passed to the named_buff and named_buff_iter
206 callbacks above. Those routines are called from universal.c via the
207 Tie::Hash::NamedCapture interface for %+ and %- and the re::
208 functions in the same file.
209*/
210
211/* The Tie::Hash::NamedCapture operation this is part of, if any */
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212#define RXapif_FETCH 0x0001
213#define RXapif_STORE 0x0002
214#define RXapif_DELETE 0x0004
215#define RXapif_CLEAR 0x0008
216#define RXapif_EXISTS 0x0010
217#define RXapif_SCALAR 0x0020
218#define RXapif_FIRSTKEY 0x0040
219#define RXapif_NEXTKEY 0x0080
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220
221/* Whether %+ or %- is being operated on */
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222#define RXapif_ONE 0x0100 /* %+ */
223#define RXapif_ALL 0x0200 /* %- */
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224
225/* Whether this is being called from a re:: function */
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226#define RXapif_REGNAME 0x0400
227#define RXapif_REGNAMES 0x0800
7948fc08 228#define RXapif_REGNAMES_COUNT 0x1000
192b9cd1 229
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230/*
231=head1 REGEXP Functions
232
233=for apidoc Am|REGEXP *|SvRX|SV *sv
234
72d33970 235Convenience macro to get the REGEXP from a SV. This is approximately
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236equivalent to the following snippet:
237
238 if (SvMAGICAL(sv))
239 mg_get(sv);
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240 if (SvROK(sv))
241 sv = MUTABLE_SV(SvRV(sv));
242 if (SvTYPE(sv) == SVt_REGEXP)
243 return (REGEXP*) sv;
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244
245NULL will be returned if a REGEXP* is not found.
246
247=for apidoc Am|bool|SvRXOK|SV* sv
248
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249Returns a boolean indicating whether the SV (or the one it references)
250is a REGEXP.
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251
252If you want to do something with the REGEXP* later use SvRX instead
253and check for NULL.
254
255=cut
256*/
257
258#define SvRX(sv) (Perl_get_re_arg(aTHX_ sv))
259#define SvRXOK(sv) (Perl_get_re_arg(aTHX_ sv) ? TRUE : FALSE)
260
261
7948fc08 262/* Flags stored in regexp->extflags
bbe252da 263 * These are used by code external to the regexp engine
e357fc67 264 *
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265 * Note that the flags whose names start with RXf_PMf_ are defined in
266 * op_reg_common.h, being copied from the parallel flags of op_pmflags
cb5027f2 267 *
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268 * NOTE: if you modify any RXf flags you should run regen.pl or
269 * regen/regcomp.pl so that regnodes.h is updated with the changes.
cb5027f2 270 *
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271 */
272
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273#include "op_reg_common.h"
274
cde0cee5 275#define RXf_PMf_STD_PMMOD (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_FOLD|RXf_PMf_EXTENDED)
cde0cee5 276
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277#define CASE_STD_PMMOD_FLAGS_PARSE_SET(pmfl) \
278 case IGNORE_PAT_MOD: *(pmfl) |= RXf_PMf_FOLD; break; \
279 case MULTILINE_PAT_MOD: *(pmfl) |= RXf_PMf_MULTILINE; break; \
280 case SINGLE_PAT_MOD: *(pmfl) |= RXf_PMf_SINGLELINE; break; \
281 case XTENDED_PAT_MOD: *(pmfl) |= RXf_PMf_EXTENDED; break
bbe252da 282
94b03d7d 283/* Note, includes charset ones, assumes 0 is the default for them */
fb85c044 284#define STD_PMMOD_FLAGS_CLEAR(pmfl) \
a62b1201 285 *(pmfl) &= ~(RXf_PMf_FOLD|RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_EXTENDED|RXf_PMf_CHARSET)
fb85c044 286
bcdf7404 287/* chars and strings used as regex pattern modifiers
486ec47a 288 * Singular is a 'c'har, plural is a "string"
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289 *
290 * NOTE, KEEPCOPY was originally 'k', but was changed to 'p' for preserve
291 * for compatibility reasons with Regexp::Common which highjacked (?k:...)
292 * for its own uses. So 'k' is out as well.
bcdf7404 293 */
85508812 294#define DEFAULT_PAT_MOD '^' /* Short for all the default modifiers */
bcdf7404 295#define EXEC_PAT_MOD 'e'
87e95b7f 296#define KEEPCOPY_PAT_MOD 'p'
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297#define ONCE_PAT_MOD 'o'
298#define GLOBAL_PAT_MOD 'g'
299#define CONTINUE_PAT_MOD 'c'
300#define MULTILINE_PAT_MOD 'm'
301#define SINGLE_PAT_MOD 's'
302#define IGNORE_PAT_MOD 'i'
303#define XTENDED_PAT_MOD 'x'
4f4d7508 304#define NONDESTRUCT_PAT_MOD 'r'
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305#define LOCALE_PAT_MOD 'l'
306#define UNICODE_PAT_MOD 'u'
50e91148 307#define DEPENDS_PAT_MOD 'd'
cfaf538b 308#define ASCII_RESTRICT_PAT_MOD 'a'
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309
310#define ONCE_PAT_MODS "o"
87e95b7f 311#define KEEPCOPY_PAT_MODS "p"
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312#define EXEC_PAT_MODS "e"
313#define LOOP_PAT_MODS "gc"
4f4d7508 314#define NONDESTRUCT_PAT_MODS "r"
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315#define LOCALE_PAT_MODS "l"
316#define UNICODE_PAT_MODS "u"
50e91148 317#define DEPENDS_PAT_MODS "d"
cfaf538b 318#define ASCII_RESTRICT_PAT_MODS "a"
df7a8460 319#define ASCII_MORE_RESTRICT_PAT_MODS "aa"
bcdf7404 320
78fecfc8 321/* This string is expected by regcomp.c to be ordered so that the first
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322 * character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of extflags; the next
323 * character is bit +1, etc. */
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324#define STD_PAT_MODS "msix"
325
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326#define CHARSET_PAT_MODS ASCII_RESTRICT_PAT_MODS DEPENDS_PAT_MODS LOCALE_PAT_MODS UNICODE_PAT_MODS
327
78fecfc8 328/* This string is expected by XS_re_regexp_pattern() in universal.c to be ordered
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329 * so that the first character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of
330 * extflags; the next character is in bit +1, etc. */
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331#define INT_PAT_MODS STD_PAT_MODS KEEPCOPY_PAT_MODS
332
333#define EXT_PAT_MODS ONCE_PAT_MODS KEEPCOPY_PAT_MODS
94b03d7d 334#define QR_PAT_MODS STD_PAT_MODS EXT_PAT_MODS CHARSET_PAT_MODS
bcdf7404 335#define M_PAT_MODS QR_PAT_MODS LOOP_PAT_MODS
4f4d7508 336#define S_PAT_MODS M_PAT_MODS EXEC_PAT_MODS NONDESTRUCT_PAT_MODS
bcdf7404 337
cb5027f2 338/*
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339 * NOTE: if you modify any RXf flags you should run regen.pl or
340 * regen/regcomp.pl so that regnodes.h is updated with the changes.
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341 *
342 */
bcdf7404 343
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344/* Leave some space, so future bit allocations can go either in the shared or
345 * unshared area without affecting binary compatibility */
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346#define RXf_BASE_SHIFT (_RXf_PMf_SHIFT_NEXT)
347
348/*
349 Set in Perl_pmruntime if op_flags & OPf_SPECIAL, i.e. split. Will
350 be used by regex engines to check whether they should set
351 RXf_SKIPWHITE
352*/
353#define RXf_SPLIT (1<<(RXf_BASE_SHIFT-1))
354#if RXf_SPLIT != RXf_PMf_SPLIT
355# error "RXf_SPLIT does not match RXf_PMf_SPLIT"
356#endif
f4a4cecb 357
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358/* Manually decorate this function with gcc-style attributes just to
359 * avoid having to restructure the header files and their called order,
360 * as proto.h would have to be included before this file, and isn't */
361
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362PERL_STATIC_INLINE const char *
363get_regex_charset_name(const U32 flags, STRLEN* const lenp)
364 __attribute__warn_unused_result__;
365
df7a8460 366#define MAX_CHARSET_NAME_LENGTH 2
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367
368PERL_STATIC_INLINE const char *
369get_regex_charset_name(const U32 flags, STRLEN* const lenp)
370{
371 /* Returns a string that corresponds to the name of the regex character set
372 * given by 'flags', and *lenp is set the length of that string, which
373 * cannot exceed MAX_CHARSET_NAME_LENGTH characters */
374
375 *lenp = 1;
376 switch (get_regex_charset(flags)) {
50e91148 377 case REGEX_DEPENDS_CHARSET: return DEPENDS_PAT_MODS;
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378 case REGEX_LOCALE_CHARSET: return LOCALE_PAT_MODS;
379 case REGEX_UNICODE_CHARSET: return UNICODE_PAT_MODS;
cfaf538b 380 case REGEX_ASCII_RESTRICTED_CHARSET: return ASCII_RESTRICT_PAT_MODS;
df7a8460 381 case REGEX_ASCII_MORE_RESTRICTED_CHARSET:
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382 *lenp = 2;
383 return ASCII_MORE_RESTRICT_PAT_MODS;
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384 default:
385 return "?"; /* Unknown */
a62b1201 386 }
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387}
388
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389/* Do we have some sort of anchor? */
390#define RXf_IS_ANCHORED (1<<(RXf_BASE_SHIFT+0))
391#define RXf_UNUSED1 (1<<(RXf_BASE_SHIFT+1))
392#define RXf_UNUSED2 (1<<(RXf_BASE_SHIFT+2))
393#define RXf_UNUSED3 (1<<(RXf_BASE_SHIFT+3))
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394#define RXf_UNUSED4 (1<<(RXf_BASE_SHIFT+4))
395#define RXf_UNUSED5 (1<<(RXf_BASE_SHIFT+5))
52d81aa8 396
bbe252da 397/* What we have seen */
dbc200c5 398#define RXf_NO_INPLACE_SUBST (1<<(RXf_BASE_SHIFT+6))
1ad4ec54 399#define RXf_EVAL_SEEN (1<<(RXf_BASE_SHIFT+7))
5e11cd63 400#define RXf_UNUSED8 (1<<(RXf_BASE_SHIFT+8))
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401
402/* Special */
ee273784 403#define RXf_UNBOUNDED_QUANTIFIER_SEEN (1<<(RXf_BASE_SHIFT+9))
1ad4ec54 404#define RXf_CHECK_ALL (1<<(RXf_BASE_SHIFT+10))
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405
406/* UTF8 related */
0603fe5c 407#define RXf_MATCH_UTF8 (1<<(RXf_BASE_SHIFT+11)) /* $1 etc are utf8 */
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408
409/* Intuit related */
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410#define RXf_USE_INTUIT_NOML (1<<(RXf_BASE_SHIFT+12))
411#define RXf_USE_INTUIT_ML (1<<(RXf_BASE_SHIFT+13))
412#define RXf_INTUIT_TAIL (1<<(RXf_BASE_SHIFT+14))
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413#define RXf_USE_INTUIT (RXf_USE_INTUIT_NOML|RXf_USE_INTUIT_ML)
414
415/* Copy and tainted info */
e795e964 416#define RXf_COPY_DONE (1<<(RXf_BASE_SHIFT+16))
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417
418/* during execution: pattern temporarily tainted by executing locale ops;
419 * post-execution: $1 et al are tainted */
e795e964 420#define RXf_TAINTED_SEEN (1<<(RXf_BASE_SHIFT+17))
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421/* this pattern was tainted during compilation */
422#define RXf_TAINTED (1<<(RXf_BASE_SHIFT+18))
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423
424/* Flags indicating special patterns */
e795e964 425#define RXf_START_ONLY (1<<(RXf_BASE_SHIFT+19)) /* Pattern is /^/ */
dbc200c5 426#define RXf_SKIPWHITE (1<<(RXf_BASE_SHIFT+20)) /* Pattern is for a split " " */
e795e964 427#define RXf_WHITE (1<<(RXf_BASE_SHIFT+21)) /* Pattern is /\s+/ */
ca835a20 428#define RXf_NULL (1U<<(RXf_BASE_SHIFT+22)) /* Pattern is // */
e795e964 429#if RXf_BASE_SHIFT+22 > 31
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430# error Too many RXf_PMf bits used. See regnodes.h for any spare in middle
431#endif
c737faaf 432
cb5027f2 433/*
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434 * NOTE: if you modify any RXf flags you should run regen.pl or
435 * regen/regcomp.pl so that regnodes.h is updated with the changes.
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436 *
437 */
bbe252da 438
dc6d7f5c 439#ifdef NO_TAINT_SUPPORT
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440# define RX_ISTAINTED(prog) 0
441# define RX_TAINT_on(prog) NOOP
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442# define RXp_MATCH_TAINTED(prog) 0
443# define RX_MATCH_TAINTED(prog) 0
444# define RXp_MATCH_TAINTED_on(prog) NOOP
445# define RX_MATCH_TAINTED_on(prog) NOOP
446# define RX_MATCH_TAINTED_off(prog) NOOP
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447#else
448# define RX_ISTAINTED(prog) (RX_EXTFLAGS(prog) & RXf_TAINTED)
449# define RX_TAINT_on(prog) (RX_EXTFLAGS(prog) |= RXf_TAINTED)
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450# define RXp_MATCH_TAINTED(prog) (RXp_EXTFLAGS(prog) & RXf_TAINTED_SEEN)
451# define RX_MATCH_TAINTED(prog) (RX_EXTFLAGS(prog) & RXf_TAINTED_SEEN)
452# define RXp_MATCH_TAINTED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_TAINTED_SEEN)
453# define RX_MATCH_TAINTED_on(prog) (RX_EXTFLAGS(prog) |= RXf_TAINTED_SEEN)
454# define RX_MATCH_TAINTED_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_TAINTED_SEEN)
284167a5
SM
455#endif
456
bbe252da 457#define RX_HAS_CUTGROUP(prog) ((prog)->intflags & PREGf_CUTGROUP_SEEN)
72311751
GS
458#define RX_MATCH_TAINTED_set(prog, t) ((t) \
459 ? RX_MATCH_TAINTED_on(prog) \
460 : RX_MATCH_TAINTED_off(prog))
c277df42 461
07bc277f
NC
462#define RXp_MATCH_COPIED(prog) (RXp_EXTFLAGS(prog) & RXf_COPY_DONE)
463#define RX_MATCH_COPIED(prog) (RX_EXTFLAGS(prog) & RXf_COPY_DONE)
464#define RXp_MATCH_COPIED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_COPY_DONE)
465#define RX_MATCH_COPIED_on(prog) (RX_EXTFLAGS(prog) |= RXf_COPY_DONE)
466#define RXp_MATCH_COPIED_off(prog) (RXp_EXTFLAGS(prog) &= ~RXf_COPY_DONE)
467#define RX_MATCH_COPIED_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_COPY_DONE)
cf93c79d
IZ
468#define RX_MATCH_COPIED_set(prog,t) ((t) \
469 ? RX_MATCH_COPIED_on(prog) \
470 : RX_MATCH_COPIED_off(prog))
f9f4320a 471
07bc277f 472#define RXp_EXTFLAGS(rx) ((rx)->extflags)
dbc200c5 473#define RXp_COMPFLAGS(rx) ((rx)->compflags)
866c78d1 474
07bc277f 475/* For source compatibility. We used to store these explicitly. */
8d919b0a
FC
476#define RX_PRECOMP(prog) (RX_WRAPPED(prog) + ReANY(prog)->pre_prefix)
477#define RX_PRECOMP_const(prog) (RX_WRAPPED_const(prog) + ReANY(prog)->pre_prefix)
5509d87a
NC
478/* FIXME? Are we hardcoding too much here and constraining plugin extension
479 writers? Specifically, the value 1 assumes that the wrapped version always
480 has exactly one character at the end, a ')'. Will that always be true? */
8d919b0a
FC
481#define RX_PRELEN(prog) (RX_WRAPLEN(prog) - ReANY(prog)->pre_prefix - 1)
482#define RX_WRAPPED(prog) ReANY(prog)->xpv_len_u.xpvlenu_pv
483#define RX_WRAPPED_const(prog) ((const char *)RX_WRAPPED(prog))
9d17798d 484#define RX_WRAPLEN(prog) SvCUR(prog)
8d919b0a 485#define RX_CHECK_SUBSTR(prog) (ReANY(prog)->check_substr)
288b8c02 486#define RX_REFCNT(prog) SvREFCNT(prog)
8d919b0a 487#define RX_EXTFLAGS(prog) RXp_EXTFLAGS(ReANY(prog))
dbc200c5 488#define RX_COMPFLAGS(prog) RXp_COMPFLAGS(ReANY(prog))
8d919b0a
FC
489#define RX_ENGINE(prog) (ReANY(prog)->engine)
490#define RX_SUBBEG(prog) (ReANY(prog)->subbeg)
491#define RX_SUBOFFSET(prog) (ReANY(prog)->suboffset)
492#define RX_SUBCOFFSET(prog) (ReANY(prog)->subcoffset)
493#define RX_OFFS(prog) (ReANY(prog)->offs)
494#define RX_NPARENS(prog) (ReANY(prog)->nparens)
495#define RX_SUBLEN(prog) (ReANY(prog)->sublen)
496#define RX_MINLEN(prog) (ReANY(prog)->minlen)
497#define RX_MINLENRET(prog) (ReANY(prog)->minlenret)
498#define RX_GOFS(prog) (ReANY(prog)->gofs)
499#define RX_LASTPAREN(prog) (ReANY(prog)->lastparen)
500#define RX_LASTCLOSEPAREN(prog) (ReANY(prog)->lastcloseparen)
501#define RX_SAVED_COPY(prog) (ReANY(prog)->saved_copy)
03c83e26
DM
502/* last match was zero-length */
503#define RX_ZERO_LEN(prog) \
99a90e59
FC
504 (RX_OFFS(prog)[0].start + (SSize_t)RX_GOFS(prog) \
505 == RX_OFFS(prog)[0].end)
220fc49f 506
be8e71aa
YO
507#endif /* PLUGGABLE_RE_EXTENSION */
508
486ec47a 509/* Stuff that needs to be included in the pluggable extension goes below here */
be8e71aa 510
db2c6cb3 511#ifdef PERL_ANY_COW
ed252734 512#define RX_MATCH_COPY_FREE(rx) \
bdd9a1b1
NC
513 STMT_START {if (RX_SAVED_COPY(rx)) { \
514 SV_CHECK_THINKFIRST_COW_DROP(RX_SAVED_COPY(rx)); \
ed252734
NC
515 } \
516 if (RX_MATCH_COPIED(rx)) { \
07bc277f 517 Safefree(RX_SUBBEG(rx)); \
ed252734
NC
518 RX_MATCH_COPIED_off(rx); \
519 }} STMT_END
520#else
521#define RX_MATCH_COPY_FREE(rx) \
522 STMT_START {if (RX_MATCH_COPIED(rx)) { \
07bc277f 523 Safefree(RX_SUBBEG(rx)); \
ed252734
NC
524 RX_MATCH_COPIED_off(rx); \
525 }} STMT_END
526#endif
527
07bc277f
NC
528#define RXp_MATCH_UTF8(prog) (RXp_EXTFLAGS(prog) & RXf_MATCH_UTF8)
529#define RX_MATCH_UTF8(prog) (RX_EXTFLAGS(prog) & RXf_MATCH_UTF8)
530#define RX_MATCH_UTF8_on(prog) (RX_EXTFLAGS(prog) |= RXf_MATCH_UTF8)
531#define RX_MATCH_UTF8_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_MATCH_UTF8)
a30b2f1f 532#define RX_MATCH_UTF8_set(prog, t) ((t) \
0603fe5c
DM
533 ? RX_MATCH_UTF8_on(prog) \
534 : RX_MATCH_UTF8_off(prog))
efd26800
NC
535
536/* Whether the pattern stored at RX_WRAPPED is in UTF-8 */
8f6ae13c 537#define RX_UTF8(prog) SvUTF8(prog)
7948fc08 538
a340edde
DM
539
540/* bits in flags arg of Perl_regexec_flags() */
541
542#define REXEC_COPY_STR 0x01 /* Need to copy the string for captures. */
543#define REXEC_CHECKED 0x02 /* re_intuit_start() already called. */
544#define REXEC_SCREAM 0x04 /* currently unused. */
545#define REXEC_IGNOREPOS 0x08 /* use stringarg, not pos(), for \G match */
546#define REXEC_NOT_FIRST 0x10 /* This is another iteration of //g:
547 no need to copy string again */
548
549 /* under REXEC_COPY_STR, it's ok for the
550 engine (modulo PL_sawamperand etc)
551 to skip copying: ... */
552#define REXEC_COPY_SKIP_PRE 0x20 /* ...the $` part of the string, or */
553#define REXEC_COPY_SKIP_POST 0x40 /* ...the $' part of the string */
d5e7783a
DM
554#define REXEC_FAIL_ON_UNDERFLOW 0x80 /* fail the match if $& would start before
555 the start pos (so s/.\G// would fail
556 on second iteration */
c277df42 557
7fe44985 558#if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
288b8c02
NC
559# define ReREFCNT_inc(re) \
560 ({ \
561 /* This is here to generate a casting warning if incorrect. */ \
7948fc08
RU
562 REGEXP *const _rerefcnt_inc = (re); \
563 assert(SvTYPE(_rerefcnt_inc) == SVt_REGEXP); \
564 SvREFCNT_inc(_rerefcnt_inc); \
565 _rerefcnt_inc; \
288b8c02
NC
566 })
567# define ReREFCNT_dec(re) \
568 ({ \
569 /* This is here to generate a casting warning if incorrect. */ \
7948fc08
RU
570 REGEXP *const _rerefcnt_dec = (re); \
571 SvREFCNT_dec(_rerefcnt_dec); \
288b8c02
NC
572 })
573#else
574# define ReREFCNT_dec(re) SvREFCNT_dec(re)
b7e0bd9e 575# define ReREFCNT_inc(re) ((REGEXP *) SvREFCNT_inc(re))
288b8c02 576#endif
8d919b0a 577#define ReANY(re) S_ReANY((const REGEXP *)(re))
288b8c02
NC
578
579/* FIXME for plugins. */
cf93c79d
IZ
580
581#define FBMcf_TAIL_DOLLAR 1
cad2e5aa
JH
582#define FBMcf_TAIL_DOLLARM 2
583#define FBMcf_TAIL_Z 4
584#define FBMcf_TAIL_z 8
585#define FBMcf_TAIL (FBMcf_TAIL_DOLLAR|FBMcf_TAIL_DOLLARM|FBMcf_TAIL_Z|FBMcf_TAIL_z)
cf93c79d
IZ
586
587#define FBMrf_MULTILINE 1
cad2e5aa 588
331b2dcc
DM
589struct regmatch_state;
590struct regmatch_slab;
8adc0f72 591
bf2039a9
DM
592/* like regmatch_info_aux, but contains extra fields only needed if the
593 * pattern contains (?{}). If used, is snuck into the second slot in the
594 * regmatch_state stack at the start of execution */
8adc0f72
DM
595
596typedef struct {
597 regexp *rex;
598 PMOP *curpm; /* saved PL_curpm */
599#ifdef PERL_ANY_COW
600 SV *saved_copy; /* saved saved_copy field from rex */
601#endif
602 char *subbeg; /* saved subbeg field from rex */
603 STRLEN sublen; /* saved sublen field from rex */
604 STRLEN suboffset; /* saved suboffset field from rex */
605 STRLEN subcoffset; /* saved subcoffset field from rex */
606 MAGIC *pos_magic; /* pos() magic attached to $_ */
ea3daa5d 607 SSize_t pos; /* the original value of pos() in pos_magic */
25fdce4a 608 U8 pos_flags; /* flags to be restored; currently only MGf_BYTES*/
bf2039a9
DM
609} regmatch_info_aux_eval;
610
611
612/* fields that logically live in regmatch_info, but which need cleaning
613 * up on croak(), and so are instead are snuck into the first slot in
614 * the regmatch_state stack at the start of execution */
615
616typedef struct {
617 regmatch_info_aux_eval *info_aux_eval;
331b2dcc
DM
618 struct regmatch_state *old_regmatch_state; /* saved PL_regmatch_state */
619 struct regmatch_slab *old_regmatch_slab; /* saved PL_regmatch_slab */
2ac8ff4b 620 char *poscache; /* S-L cache of fail positions of WHILEMs */
bf2039a9
DM
621} regmatch_info_aux;
622
8adc0f72 623
3b0527fe 624/* some basic information about the current match that is created by
bf2039a9
DM
625 * Perl_regexec_flags and then passed to regtry(), regmatch() etc.
626 * It is allocated as a local var on the stack, so nothing should be
627 * stored in it that needs preserving or clearing up on croak().
628 * For that, see the aux_info and aux_info_eval members of the
629 * regmatch_state union. */
3b0527fe
DM
630
631typedef struct {
28d03b21 632 REGEXP *prog; /* the regex being executed */
9d9163fb 633 const char * strbeg; /* real start of string */
28d03b21
DM
634 char *strend; /* one byte beyond last char of match string */
635 char *till; /* matches shorter than this fail (see minlen arg) */
636 SV *sv; /* the SV string currently being matched */
637 char *ganch; /* position of \G anchor */
638 char *cutpoint; /* (*COMMIT) position (if any) */
bf2039a9
DM
639 regmatch_info_aux *info_aux; /* extra fields that need cleanup */
640 regmatch_info_aux_eval *info_aux_eval; /* extra saved state for (?{}) */
1cb48e53
DM
641 I32 poscache_maxiter; /* how many whilems todo before S-L cache kicks in */
642 I32 poscache_iter; /* current countdown from _maxiter to zero */
2ac8ff4b 643 STRLEN poscache_size; /* size of regmatch_info_aux.poscache */
02d5137b 644 bool intuit; /* re_intuit_start() is the top-level caller */
ba44c216
DM
645 bool is_utf8_pat; /* regex is utf8 */
646 bool is_utf8_target; /* string being matched is utf8 */
39819bd9 647 bool warned; /* we have issued a recursion warning; no need for more */
3b0527fe
DM
648} regmatch_info;
649
5d9a96ca
DM
650
651/* structures for holding and saving the state maintained by regmatch() */
652
d56b3014 653#ifndef MAX_RECURSE_EVAL_NOCHANGE_DEPTH
4b196cd4 654#define MAX_RECURSE_EVAL_NOCHANGE_DEPTH 1000
d56b3014 655#endif
6bda09f9 656
5d9a96ca
DM
657typedef I32 CHECKPOINT;
658
a0374537 659typedef struct regmatch_state {
40a82448 660 int resume_state; /* where to jump to on return */
24d3c4a9 661 char *locinput; /* where to backtrack in string on failure */
e822a8b4
DM
662
663 union {
77cb431f 664
bf2039a9
DM
665 /* the 'info_aux' and 'info_aux_eval' union members are cuckoos in
666 * the nest. They aren't saved backtrack state; rather they
667 * represent one or two extra chunks of data that need allocating
668 * at the start of a match. These fields would logically live in
669 * the regmatch_info struct, except that is allocated on the
670 * C stack, and these fields are all things that require cleanup
671 * after a croak(), when the stack is lost.
672 * As a convenience, we just use the first 1 or 2 regmatch_state
673 * slots to store this info, as we will be allocating a slab of
674 * these anyway. Otherwise we'd have to malloc and then free them,
675 * or allocate them on the save stack (where they will get
676 * realloced if the save stack grows).
677 * info_aux contains the extra fields that are always needed;
678 * info_aux_eval contains extra fields that only needed if
679 * the pattern contains code blocks
680 * We split them into two separate structs to avoid increasing
681 * the size of the union.
682 */
683
684 regmatch_info_aux info_aux;
685
686 regmatch_info_aux_eval info_aux_eval;
687
77cb431f
DM
688 /* this is a fake union member that matches the first element
689 * of each member that needs to store positive backtrack
690 * information */
691 struct {
692 struct regmatch_state *prev_yes_state;
693 } yes;
694
fae667d5
YO
695 /* branchlike members */
696 /* this is a fake union member that matches the first elements
697 * of each member that needs to behave like a branch */
698 struct {
5d458dd8
YO
699 /* this first element must match u.yes */
700 struct regmatch_state *prev_yes_state;
fae667d5 701 U32 lastparen;
f6033a9d 702 U32 lastcloseparen;
fae667d5
YO
703 CHECKPOINT cp;
704
705 } branchlike;
706
707 struct {
708 /* the first elements must match u.branchlike */
709 struct regmatch_state *prev_yes_state;
710 U32 lastparen;
f6033a9d 711 U32 lastcloseparen;
fae667d5
YO
712 CHECKPOINT cp;
713
714 regnode *next_branch; /* next branch node */
715 } branch;
716
717 struct {
718 /* the first elements must match u.branchlike */
719 struct regmatch_state *prev_yes_state;
720 U32 lastparen;
f6033a9d 721 U32 lastcloseparen;
fae667d5
YO
722 CHECKPOINT cp;
723
2e64971a 724 U32 accepted; /* how many accepting states left */
6603fe3e 725 bool longfold;/* saw a fold with a 1->n char mapping */
7f69552c 726 U16 *jump; /* positive offsets from me */
7f69552c 727 regnode *me; /* Which node am I - needed for jump tries*/
2e64971a
DM
728 U8 *firstpos;/* pos in string of first trie match */
729 U32 firstchars;/* len in chars of firstpos from start */
730 U16 nextword;/* next word to try */
731 U16 topword; /* longest accepted word */
e822a8b4
DM
732 } trie;
733
fae667d5
YO
734 /* special types - these members are used to store state for special
735 regops like eval, if/then, lookaround and the markpoint state */
e822a8b4 736 struct {
77cb431f
DM
737 /* this first element must match u.yes */
738 struct regmatch_state *prev_yes_state;
faec1544
DM
739 struct regmatch_state *prev_eval;
740 struct regmatch_state *prev_curlyx;
288b8c02 741 REGEXP *prev_rex;
aa283a38
DM
742 CHECKPOINT cp; /* remember current savestack indexes */
743 CHECKPOINT lastcp;
6bda09f9 744 U32 close_paren; /* which close bracket is our end */
1b5c067c 745 regnode *B; /* the node following us */
e822a8b4
DM
746 } eval;
747
748 struct {
c476f425 749 /* this first element must match u.yes */
262b90c4 750 struct regmatch_state *prev_yes_state;
fae667d5
YO
751 I32 wanted;
752 I32 logical; /* saved copy of 'logical' var */
753 regnode *me; /* the IFMATCH/SUSPEND/UNLESSM node */
754 } ifmatch; /* and SUSPEND/UNLESSM */
755
756 struct {
757 /* this first element must match u.yes */
758 struct regmatch_state *prev_yes_state;
759 struct regmatch_state *prev_mark;
760 SV* mark_name;
761 char *mark_loc;
762 } mark;
763
764 struct {
765 int val;
766 } keeper;
767
768 /* quantifiers - these members are used for storing state for
769 for the regops used to implement quantifiers */
770 struct {
771 /* this first element must match u.yes */
772 struct regmatch_state *prev_yes_state;
c476f425 773 struct regmatch_state *prev_curlyx; /* previous cur_curlyx */
d02d6d97
DM
774 regnode *me; /* the CURLYX node */
775 regnode *B; /* the B node in /A*B/ */
c476f425
DM
776 CHECKPOINT cp; /* remember current savestack index */
777 bool minmod;
a0374537 778 int parenfloor;/* how far back to strip paren data */
c476f425
DM
779
780 /* these two are modified by WHILEM */
781 int count; /* how many instances of A we've matched */
782 char *lastloc;/* where previous A matched (0-len detect) */
e822a8b4
DM
783 } curlyx;
784
785 struct {
c476f425 786 /* this first element must match u.yes */
262b90c4 787 struct regmatch_state *prev_yes_state;
c476f425
DM
788 struct regmatch_state *save_curlyx;
789 CHECKPOINT cp; /* remember current savestack indexes */
790 CHECKPOINT lastcp;
791 char *save_lastloc; /* previous curlyx.lastloc */
792 I32 cache_offset;
793 I32 cache_mask;
e822a8b4
DM
794 } whilem;
795
796 struct {
5d458dd8
YO
797 /* this first element must match u.yes */
798 struct regmatch_state *prev_yes_state;
79a2a0e8 799 int c1, c2; /* case fold search */
40a82448 800 CHECKPOINT cp;
f6033a9d
DM
801 U32 lastparen;
802 U32 lastcloseparen;
40a82448
DM
803 I32 alen; /* length of first-matched A string */
804 I32 count;
0cadcf80 805 bool minmod;
40a82448
DM
806 regnode *A, *B; /* the nodes corresponding to /A*B/ */
807 regnode *me; /* the curlym node */
79a2a0e8
KW
808 U8 c1_utf8[UTF8_MAXBYTES+1]; /* */
809 U8 c2_utf8[UTF8_MAXBYTES+1];
e822a8b4
DM
810 } curlym;
811
812 struct {
3b6647e0 813 U32 paren;
c255a977 814 CHECKPOINT cp;
f6033a9d
DM
815 U32 lastparen;
816 U32 lastcloseparen;
79a2a0e8 817 int c1, c2; /* case fold search */
c255a977
DM
818 char *maxpos; /* highest possible point in string to match */
819 char *oldloc; /* the previous locinput */
e822a8b4 820 int count;
c255a977
DM
821 int min, max; /* {m,n} */
822 regnode *A, *B; /* the nodes corresponding to /A*B/ */
79a2a0e8
KW
823 U8 c1_utf8[UTF8_MAXBYTES+1]; /* */
824 U8 c2_utf8[UTF8_MAXBYTES+1];
c255a977 825 } curly; /* and CURLYN/PLUS/STAR */
dad79028 826
d8319b27 827 } u;
5d9a96ca
DM
828} regmatch_state;
829
830/* how many regmatch_state structs to allocate as a single slab.
831 * We do it in 4K blocks for efficiency. The "3" is 2 for the next/prev
832 * pointers, plus 1 for any mythical malloc overhead. */
833
834#define PERL_REGMATCH_SLAB_SLOTS \
835 ((4096 - 3 * sizeof (void*)) / sizeof(regmatch_state))
836
837typedef struct regmatch_slab {
838 regmatch_state states[PERL_REGMATCH_SLAB_SLOTS];
839 struct regmatch_slab *prev, *next;
840} regmatch_slab;
1ade1aa1 841
46ab3289 842
cde0cee5 843
1ade1aa1
NC
844/*
845 * Local variables:
846 * c-indentation-style: bsd
847 * c-basic-offset: 4
14d04a33 848 * indent-tabs-mode: nil
1ade1aa1
NC
849 * End:
850 *
14d04a33 851 * ex: set ts=8 sts=4 sw=4 et:
1ade1aa1 852 */