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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 |
d6376244 JH |
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 | * | |
a0d0e21e LW |
9 | */ |
10 | ||
378cc40b LW |
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 |
785a26d5 YO |
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 | |
6c5474e8 | 21 | # include "utf8.h" |
79a2a0e8 | 22 | |
f55b7b26 KW |
23 | typedef SSize_t regnode_offset; |
24 | ||
c277df42 IZ |
25 | struct regnode { |
26 | U8 flags; | |
27 | U8 type; | |
28 | U16 next_off; | |
29 | }; | |
30 | ||
31 | typedef struct regnode regnode; | |
32 | ||
cad2e5aa | 33 | struct reg_substr_data; |
2779dcf1 | 34 | |
0ee3c8d0 JH |
35 | struct reg_data; |
36 | ||
f9f4320a | 37 | struct regexp_engine; |
28d8d7f4 | 38 | struct regexp; |
bbe252da | 39 | |
785a26d5 | 40 | struct reg_substr_datum { |
c4828ca0 DM |
41 | SSize_t min_offset; /* min pos (in chars) that substr must appear */ |
42 | SSize_t max_offset /* max pos (in chars) that substr must appear */; | |
785a26d5 YO |
43 | SV *substr; /* non-utf8 variant */ |
44 | SV *utf8_substr; /* utf8 variant */ | |
c4828ca0 | 45 | SSize_t end_shift; /* how many fixed chars must end the string */ |
785a26d5 YO |
46 | }; |
47 | struct reg_substr_data { | |
6480a6c4 | 48 | U8 check_ix; /* index into data[] of check substr */ |
785a26d5 YO |
49 | struct reg_substr_datum data[3]; /* Actual array */ |
50 | }; | |
f9f4320a | 51 | |
6c5474e8 KW |
52 | # ifdef PERL_ANY_COW |
53 | # define SV_SAVED_COPY SV *saved_copy; /* If non-NULL, SV which is COW from original */ | |
54 | # else | |
55 | # define SV_SAVED_COPY | |
56 | # endif | |
28d8d7f4 | 57 | |
b3fd53f3 DM |
58 | /* offsets within a string of a particular /(.)/ capture */ |
59 | ||
f0ab9afb | 60 | typedef struct regexp_paren_pair { |
99a90e59 FC |
61 | SSize_t start; |
62 | SSize_t end; | |
b3fd53f3 DM |
63 | /* 'start_tmp' records a new opening position before the matching end |
64 | * has been found, so that the old start and end values are still | |
65 | * valid, e.g. | |
66 | * "abc" =~ /(.(?{print "[$1]"}))+/ | |
67 | *outputs [][a][b] | |
68 | * This field is not part of the API. */ | |
ea3daa5d | 69 | SSize_t start_tmp; |
f0ab9afb | 70 | } regexp_paren_pair; |
28d8d7f4 | 71 | |
6c5474e8 KW |
72 | # if defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_UTF8_C) |
73 | # define _invlist_union(a, b, output) _invlist_union_maybe_complement_2nd(a, b, FALSE, output) | |
74 | # define _invlist_intersection(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, FALSE, output) | |
3f80b571 KW |
75 | |
76 | /* Subtracting b from a leaves in a everything that was there that isn't in b, | |
77 | * that is the intersection of a with b's complement */ | |
6c5474e8 KW |
78 | # define _invlist_subtract(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, TRUE, output) |
79 | # endif | |
52ae8f7e | 80 | |
3d2bd50a DM |
81 | /* record the position of a (?{...}) within a pattern */ |
82 | ||
83 | struct reg_code_block { | |
84 | STRLEN start; | |
85 | STRLEN end; | |
86 | OP *block; | |
b30fcab9 | 87 | REGEXP *src_regex; |
3d2bd50a DM |
88 | }; |
89 | ||
1acab4c5 DM |
90 | /* array of reg_code_block's plus header info */ |
91 | ||
92 | struct reg_code_blocks { | |
f8def6c7 | 93 | int refcnt; /* we may be pointed to from a regex and from the savestack */ |
1acab4c5 DM |
94 | int count; /* how many code blocks */ |
95 | struct reg_code_block *cb; /* array of reg_code_block's */ | |
96 | }; | |
97 | ||
3d2bd50a | 98 | |
882227b7 AB |
99 | /* |
100 | The regexp/REGEXP struct, see L<perlreapi> for further documentation | |
101 | on the individual fields. The struct is ordered so that the most | |
102 | commonly used fields are placed at the start. | |
103 | ||
104 | Any patch that adds items to this struct will need to include | |
105 | changes to F<sv.c> (C<Perl_re_dup()>) and F<regcomp.c> | |
106 | (C<pregfree()>). This involves freeing or cloning items in the | |
107 | regexp's data array based on the data item's type. | |
108 | */ | |
109 | ||
bbe252da | 110 | typedef struct regexp { |
e1168c11 DM |
111 | _XPV_HEAD; |
112 | const struct regexp_engine* engine; /* what engine created this regexp? */ | |
113 | REGEXP *mother_re; /* what re is this a lightweight copy of? */ | |
114 | HV *paren_names; /* Optional hash of paren names */ | |
115 | ||
116 | /*---------------------------------------------------------------------- | |
117 | * Information about the match that the perl core uses to manage things | |
118 | */ | |
119 | ||
120 | U32 extflags; /* Flags used both externally and internally */ | |
2bb68ff1 | 121 | U32 nparens; /* number of capture buffers */ |
e1168c11 DM |
122 | SSize_t minlen; /* minimum possible number of chars in string to match */ |
123 | SSize_t minlenret; /* mininum possible number of chars in $& */ | |
124 | STRLEN gofs; /* chars left of pos that we search from */ | |
125 | /* substring data about strings that must appear in | |
126 | * the final match, used for optimisations */ | |
127 | struct reg_substr_data *substrs; | |
e1168c11 DM |
128 | |
129 | /* private engine specific data */ | |
130 | ||
e1168c11 DM |
131 | void *pprivate; /* Data private to the regex engine which |
132 | * created this object. */ | |
2bb68ff1 | 133 | U32 intflags; /* Engine Specific Internal flags */ |
e1168c11 DM |
134 | |
135 | /*---------------------------------------------------------------------- | |
136 | * Data about the last/current match. These are modified during matching | |
137 | */ | |
138 | ||
0b9dad94 | 139 | U32 lastparen; /* highest close paren matched ($+) */ |
e1168c11 DM |
140 | regexp_paren_pair *offs; /* Array of offsets for (@-) and (@+) */ |
141 | char **recurse_locinput; /* used to detect infinite recursion, XXX: move to internal */ | |
2bb68ff1 | 142 | U32 lastcloseparen; /* last close paren matched ($^N) */ |
e1168c11 DM |
143 | |
144 | /*---------------------------------------------------------------------- */ | |
145 | ||
146 | /* offset from wrapped to the start of precomp */ | |
147 | PERL_BITFIELD32 pre_prefix:4; | |
148 | ||
149 | /* original flags used to compile the pattern, may differ from | |
150 | * extflags in various ways */ | |
151 | PERL_BITFIELD32 compflags:9; | |
152 | ||
153 | /*---------------------------------------------------------------------- */ | |
154 | ||
da35f4ca | 155 | char *subbeg; /* saved or original string so \digit works forever. */ |
2bb68ff1 RL |
156 | SV_SAVED_COPY /* If non-NULL, SV which is COW from original */ |
157 | SSize_t sublen; /* Length of string pointed by subbeg */ | |
158 | SSize_t suboffset; /* byte offset of subbeg from logical start of str */ | |
159 | SSize_t subcoffset; /* suboffset equiv, but in chars (for @-/@+) */ | |
160 | SSize_t maxlen; /* minimum possible number of chars in string to match */ | |
2bb68ff1 RL |
161 | |
162 | /*---------------------------------------------------------------------- */ | |
163 | ||
164 | ||
e1168c11 | 165 | CV *qr_anoncv; /* the anon sub wrapped round qr/(?{..})/ */ |
f8fc2ecf YO |
166 | } regexp; |
167 | ||
e1168c11 | 168 | |
6c5474e8 | 169 | # define RXp_PAREN_NAMES(rx) ((rx)->paren_names) |
5daac39c | 170 | |
785a26d5 | 171 | /* used for high speed searches */ |
f9f4320a YO |
172 | typedef struct re_scream_pos_data_s |
173 | { | |
174 | char **scream_olds; /* match pos */ | |
ea3daa5d | 175 | SSize_t *scream_pos; /* Internal iterator of scream. */ |
f9f4320a YO |
176 | } re_scream_pos_data; |
177 | ||
785a26d5 YO |
178 | /* regexp_engine structure. This is the dispatch table for regexes. |
179 | * Any regex engine implementation must be able to build one of these. | |
180 | */ | |
f9f4320a | 181 | typedef struct regexp_engine { |
1593ad57 | 182 | REGEXP* (*comp) (pTHX_ SV * const pattern, U32 flags); |
49d7dfbc | 183 | I32 (*exec) (pTHX_ REGEXP * const rx, char* stringarg, char* strend, |
ea3daa5d | 184 | char* strbeg, SSize_t minend, SV* sv, |
49d7dfbc | 185 | void* data, U32 flags); |
52a21eb3 DM |
186 | char* (*intuit) (pTHX_ |
187 | REGEXP * const rx, | |
188 | SV *sv, | |
189 | const char * const strbeg, | |
190 | char *strpos, | |
191 | char *strend, | |
192 | const U32 flags, | |
9f61653a | 193 | re_scream_pos_data *data); |
49d7dfbc | 194 | SV* (*checkstr) (pTHX_ REGEXP * const rx); |
fc6bde6f | 195 | void (*rxfree) (pTHX_ REGEXP * const rx); |
2fdbfb4d | 196 | void (*numbered_buff_FETCH) (pTHX_ REGEXP * const rx, const I32 paren, |
192b9cd1 | 197 | SV * const sv); |
2fdbfb4d AB |
198 | void (*numbered_buff_STORE) (pTHX_ REGEXP * const rx, const I32 paren, |
199 | SV const * const value); | |
200 | I32 (*numbered_buff_LENGTH) (pTHX_ REGEXP * const rx, const SV * const sv, | |
201 | const I32 paren); | |
192b9cd1 AB |
202 | SV* (*named_buff) (pTHX_ REGEXP * const rx, SV * const key, |
203 | SV * const value, const U32 flags); | |
204 | SV* (*named_buff_iter) (pTHX_ REGEXP * const rx, const SV * const lastkey, | |
205 | const U32 flags); | |
49d7dfbc | 206 | SV* (*qr_package)(pTHX_ REGEXP * const rx); |
6c5474e8 | 207 | # ifdef USE_ITHREADS |
49d7dfbc | 208 | void* (*dupe) (pTHX_ REGEXP * const rx, CLONE_PARAMS *param); |
6c5474e8 | 209 | # endif |
3c13cae6 DM |
210 | REGEXP* (*op_comp) (pTHX_ SV ** const patternp, int pat_count, |
211 | OP *expr, const struct regexp_engine* eng, | |
7984ae89 | 212 | REGEXP *old_re, |
76ac488f | 213 | bool *is_bare_re, U32 orig_rx_flags, U32 pm_flags); |
f9f4320a YO |
214 | } regexp_engine; |
215 | ||
192b9cd1 AB |
216 | /* |
217 | These are passed to the numbered capture variable callbacks as the | |
218 | paren name. >= 1 is reserved for actual numbered captures, i.e. $1, | |
219 | $2 etc. | |
220 | */ | |
6c5474e8 KW |
221 | # define RX_BUFF_IDX_CARET_PREMATCH -5 /* ${^PREMATCH} */ |
222 | # define RX_BUFF_IDX_CARET_POSTMATCH -4 /* ${^POSTMATCH} */ | |
223 | # define RX_BUFF_IDX_CARET_FULLMATCH -3 /* ${^MATCH} */ | |
224 | # define RX_BUFF_IDX_PREMATCH -2 /* $` */ | |
225 | # define RX_BUFF_IDX_POSTMATCH -1 /* $' */ | |
226 | # define RX_BUFF_IDX_FULLMATCH 0 /* $& */ | |
192b9cd1 AB |
227 | |
228 | /* | |
229 | Flags that are passed to the named_buff and named_buff_iter | |
230 | callbacks above. Those routines are called from universal.c via the | |
231 | Tie::Hash::NamedCapture interface for %+ and %- and the re:: | |
232 | functions in the same file. | |
233 | */ | |
234 | ||
235 | /* The Tie::Hash::NamedCapture operation this is part of, if any */ | |
6c5474e8 KW |
236 | # define RXapif_FETCH 0x0001 |
237 | # define RXapif_STORE 0x0002 | |
238 | # define RXapif_DELETE 0x0004 | |
239 | # define RXapif_CLEAR 0x0008 | |
240 | # define RXapif_EXISTS 0x0010 | |
241 | # define RXapif_SCALAR 0x0020 | |
242 | # define RXapif_FIRSTKEY 0x0040 | |
243 | # define RXapif_NEXTKEY 0x0080 | |
192b9cd1 AB |
244 | |
245 | /* Whether %+ or %- is being operated on */ | |
6c5474e8 KW |
246 | # define RXapif_ONE 0x0100 /* %+ */ |
247 | # define RXapif_ALL 0x0200 /* %- */ | |
192b9cd1 AB |
248 | |
249 | /* Whether this is being called from a re:: function */ | |
6c5474e8 KW |
250 | # define RXapif_REGNAME 0x0400 |
251 | # define RXapif_REGNAMES 0x0800 | |
252 | # define RXapif_REGNAMES_COUNT 0x1000 | |
192b9cd1 | 253 | |
f7e71195 | 254 | /* |
70b05c7c | 255 | =for apidoc_section REGEXP Functions |
f7e71195 AB |
256 | |
257 | =for apidoc Am|REGEXP *|SvRX|SV *sv | |
258 | ||
72d33970 | 259 | Convenience macro to get the REGEXP from a SV. This is approximately |
f7e71195 AB |
260 | equivalent to the following snippet: |
261 | ||
262 | if (SvMAGICAL(sv)) | |
263 | mg_get(sv); | |
1af910ea DL |
264 | if (SvROK(sv)) |
265 | sv = MUTABLE_SV(SvRV(sv)); | |
266 | if (SvTYPE(sv) == SVt_REGEXP) | |
267 | return (REGEXP*) sv; | |
f7e71195 | 268 | |
796b6530 | 269 | C<NULL> will be returned if a REGEXP* is not found. |
f7e71195 AB |
270 | |
271 | =for apidoc Am|bool|SvRXOK|SV* sv | |
272 | ||
1af910ea DL |
273 | Returns a boolean indicating whether the SV (or the one it references) |
274 | is a REGEXP. | |
f7e71195 AB |
275 | |
276 | If you want to do something with the REGEXP* later use SvRX instead | |
277 | and check for NULL. | |
278 | ||
279 | =cut | |
280 | */ | |
281 | ||
6c5474e8 KW |
282 | # define SvRX(sv) (Perl_get_re_arg(aTHX_ sv)) |
283 | # define SvRXOK(sv) cBOOL(Perl_get_re_arg(aTHX_ sv)) | |
f7e71195 AB |
284 | |
285 | ||
7948fc08 | 286 | /* Flags stored in regexp->extflags |
bbe252da | 287 | * These are used by code external to the regexp engine |
e357fc67 | 288 | * |
5b126c84 KW |
289 | * Note that the flags whose names start with RXf_PMf_ are defined in |
290 | * op_reg_common.h, being copied from the parallel flags of op_pmflags | |
cb5027f2 | 291 | * |
eb2624c9 FC |
292 | * NOTE: if you modify any RXf flags you should run regen.pl or |
293 | * regen/regcomp.pl so that regnodes.h is updated with the changes. | |
cb5027f2 | 294 | * |
bbe252da YO |
295 | */ |
296 | ||
6c5474e8 | 297 | # include "op_reg_common.h" |
5b126c84 | 298 | |
6c5474e8 | 299 | # define RXf_PMf_STD_PMMOD (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_FOLD|RXf_PMf_EXTENDED|RXf_PMf_EXTENDED_MORE|RXf_PMf_NOCAPTURE) |
cde0cee5 | 300 | |
6c5474e8 | 301 | # define CASE_STD_PMMOD_FLAGS_PARSE_SET(pmfl, x_count) \ |
cc4d09e1 KW |
302 | case IGNORE_PAT_MOD: *(pmfl) |= RXf_PMf_FOLD; break; \ |
303 | case MULTILINE_PAT_MOD: *(pmfl) |= RXf_PMf_MULTILINE; break; \ | |
304 | case SINGLE_PAT_MOD: *(pmfl) |= RXf_PMf_SINGLELINE; break; \ | |
77c8f263 KW |
305 | case XTENDED_PAT_MOD: if (x_count == 0) { \ |
306 | *(pmfl) |= RXf_PMf_EXTENDED; \ | |
307 | *(pmfl) &= ~RXf_PMf_EXTENDED_MORE; \ | |
308 | } \ | |
309 | else { \ | |
310 | *(pmfl) |= RXf_PMf_EXTENDED \ | |
311 | |RXf_PMf_EXTENDED_MORE; \ | |
312 | } \ | |
313 | (x_count)++; break; \ | |
41d7c59e | 314 | case NOCAPTURE_PAT_MOD: *(pmfl) |= RXf_PMf_NOCAPTURE; break; |
cc4d09e1 | 315 | |
94b03d7d | 316 | /* Note, includes charset ones, assumes 0 is the default for them */ |
6c5474e8 | 317 | # define STD_PMMOD_FLAGS_CLEAR(pmfl) \ |
77c8f263 | 318 | *(pmfl) &= ~(RXf_PMf_FOLD|RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_EXTENDED|RXf_PMf_EXTENDED_MORE|RXf_PMf_CHARSET|RXf_PMf_NOCAPTURE) |
fb85c044 | 319 | |
bcdf7404 | 320 | /* chars and strings used as regex pattern modifiers |
486ec47a | 321 | * Singular is a 'c'har, plural is a "string" |
87e95b7f YO |
322 | * |
323 | * NOTE, KEEPCOPY was originally 'k', but was changed to 'p' for preserve | |
324 | * for compatibility reasons with Regexp::Common which highjacked (?k:...) | |
325 | * for its own uses. So 'k' is out as well. | |
bcdf7404 | 326 | */ |
6c5474e8 KW |
327 | # define DEFAULT_PAT_MOD '^' /* Short for all the default modifiers */ |
328 | # define EXEC_PAT_MOD 'e' | |
329 | # define KEEPCOPY_PAT_MOD 'p' | |
330 | # define NOCAPTURE_PAT_MOD 'n' | |
331 | # define ONCE_PAT_MOD 'o' | |
332 | # define GLOBAL_PAT_MOD 'g' | |
333 | # define CONTINUE_PAT_MOD 'c' | |
334 | # define MULTILINE_PAT_MOD 'm' | |
335 | # define SINGLE_PAT_MOD 's' | |
336 | # define IGNORE_PAT_MOD 'i' | |
337 | # define XTENDED_PAT_MOD 'x' | |
338 | # define NONDESTRUCT_PAT_MOD 'r' | |
339 | # define LOCALE_PAT_MOD 'l' | |
340 | # define UNICODE_PAT_MOD 'u' | |
341 | # define DEPENDS_PAT_MOD 'd' | |
342 | # define ASCII_RESTRICT_PAT_MOD 'a' | |
343 | ||
344 | # define ONCE_PAT_MODS "o" | |
345 | # define KEEPCOPY_PAT_MODS "p" | |
346 | # define NOCAPTURE_PAT_MODS "n" | |
347 | # define EXEC_PAT_MODS "e" | |
348 | # define LOOP_PAT_MODS "gc" | |
349 | # define NONDESTRUCT_PAT_MODS "r" | |
350 | # define LOCALE_PAT_MODS "l" | |
351 | # define UNICODE_PAT_MODS "u" | |
352 | # define DEPENDS_PAT_MODS "d" | |
353 | # define ASCII_RESTRICT_PAT_MODS "a" | |
354 | # define ASCII_MORE_RESTRICT_PAT_MODS "aa" | |
bcdf7404 | 355 | |
78fecfc8 | 356 | /* This string is expected by regcomp.c to be ordered so that the first |
c18d5d15 KW |
357 | * character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of extflags; the next |
358 | * character is bit +1, etc. */ | |
6c5474e8 | 359 | # define STD_PAT_MODS "msixxn" |
bcdf7404 | 360 | |
6c5474e8 | 361 | # define CHARSET_PAT_MODS ASCII_RESTRICT_PAT_MODS DEPENDS_PAT_MODS LOCALE_PAT_MODS UNICODE_PAT_MODS |
94b03d7d | 362 | |
78fecfc8 | 363 | /* This string is expected by XS_re_regexp_pattern() in universal.c to be ordered |
c18d5d15 KW |
364 | * so that the first character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of |
365 | * extflags; the next character is in bit +1, etc. */ | |
6c5474e8 | 366 | # define INT_PAT_MODS STD_PAT_MODS KEEPCOPY_PAT_MODS |
bcdf7404 | 367 | |
6c5474e8 KW |
368 | # define EXT_PAT_MODS ONCE_PAT_MODS KEEPCOPY_PAT_MODS NOCAPTURE_PAT_MODS |
369 | # define QR_PAT_MODS STD_PAT_MODS EXT_PAT_MODS CHARSET_PAT_MODS | |
370 | # define M_PAT_MODS QR_PAT_MODS LOOP_PAT_MODS | |
371 | # define S_PAT_MODS M_PAT_MODS EXEC_PAT_MODS NONDESTRUCT_PAT_MODS | |
bcdf7404 | 372 | |
cb5027f2 | 373 | /* |
eb2624c9 FC |
374 | * NOTE: if you modify any RXf flags you should run regen.pl or |
375 | * regen/regcomp.pl so that regnodes.h is updated with the changes. | |
cb5027f2 YO |
376 | * |
377 | */ | |
bcdf7404 | 378 | |
dbc200c5 | 379 | /* |
5012eebe DM |
380 | Set in Perl_pmruntime for a split. Will be used by regex engines to |
381 | check whether they should set RXf_SKIPWHITE | |
dbc200c5 | 382 | */ |
6c5474e8 | 383 | # define RXf_SPLIT RXf_PMf_SPLIT |
32f62247 | 384 | |
0bd51918 KW |
385 | /* Currently the regex flags occupy a single 32-bit word. Not all bits are |
386 | * currently used. The lower bits are shared with their corresponding PMf flag | |
387 | * bits, up to but not including _RXf_PMf_SHIFT_NEXT. The unused bits | |
388 | * immediately follow; finally the used RXf-only (unshared) bits, so that the | |
389 | * highest bit in the word is used. This gathers all the unused bits as a pool | |
390 | * in the middle, like so: 11111111111111110000001111111111 | |
391 | * where the '1's represent used bits, and the '0's unused. This design allows | |
392 | * us to allocate off one end of the pool if we need to add a shared bit, and | |
393 | * off the other end if we need a non-shared bit, without disturbing the other | |
394 | * bits. This maximizes the likelihood of being able to change things without | |
395 | * breaking binary compatibility. | |
396 | * | |
397 | * To add shared bits, do so in op_reg_common.h. This should change | |
398 | * _RXf_PMf_SHIFT_NEXT so that things won't compile. Then come to regexp.h and | |
399 | * op.h and adjust the constant adders in the definitions of RXf_BASE_SHIFT and | |
400 | * Pmf_BASE_SHIFT down by the number of shared bits you added. That's it. | |
401 | * Things should be binary compatible. But if either of these gets to having | |
402 | * to subtract rather than add, leave at 0 and instead adjust all the entries | |
403 | * that are in terms of it. But if the first one of those is already | |
404 | * RXf_BASE_SHIFT+0, there are no bits left, and a redesign is in order. | |
405 | * | |
406 | * To remove unshared bits, just delete its entry. If you're where breaking | |
407 | * binary compatibility is ok to do, you might want to adjust things to move | |
408 | * the newly opened space so that it gets absorbed into the common pool. | |
409 | * | |
410 | * To add unshared bits, first use up any gaps in the middle. Otherwise, | |
411 | * allocate off the low end until you get to RXf_BASE_SHIFT+0. If that isn't | |
412 | * enough, move RXf_BASE_SHIFT down (if possible) and add the new bit at the | |
413 | * other end instead; this preserves binary compatibility. | |
414 | * | |
415 | * For the regexp bits, PL_reg_extflags_name[] in regnodes.h has a comment | |
416 | * giving which bits are used/unused */ | |
417 | ||
6c5474e8 | 418 | # define RXf_BASE_SHIFT (_RXf_PMf_SHIFT_NEXT + 2) |
52d81aa8 | 419 | |
bbe252da | 420 | /* What we have seen */ |
6c5474e8 KW |
421 | # define RXf_NO_INPLACE_SUBST (1U<<(RXf_BASE_SHIFT+2)) |
422 | # define RXf_EVAL_SEEN (1U<<(RXf_BASE_SHIFT+3)) | |
bbe252da YO |
423 | |
424 | /* Special */ | |
6c5474e8 KW |
425 | # define RXf_UNBOUNDED_QUANTIFIER_SEEN (1U<<(RXf_BASE_SHIFT+4)) |
426 | # define RXf_CHECK_ALL (1U<<(RXf_BASE_SHIFT+5)) | |
bbe252da YO |
427 | |
428 | /* UTF8 related */ | |
6c5474e8 | 429 | # define RXf_MATCH_UTF8 (1U<<(RXf_BASE_SHIFT+6)) /* $1 etc are utf8 */ |
bbe252da YO |
430 | |
431 | /* Intuit related */ | |
6c5474e8 KW |
432 | # define RXf_USE_INTUIT_NOML (1U<<(RXf_BASE_SHIFT+7)) |
433 | # define RXf_USE_INTUIT_ML (1U<<(RXf_BASE_SHIFT+8)) | |
434 | # define RXf_INTUIT_TAIL (1U<<(RXf_BASE_SHIFT+9)) | |
435 | # define RXf_USE_INTUIT (RXf_USE_INTUIT_NOML|RXf_USE_INTUIT_ML) | |
bbe252da | 436 | |
a3b51d37 | 437 | /* Do we have some sort of anchor? */ |
6c5474e8 | 438 | # define RXf_IS_ANCHORED (1U<<(RXf_BASE_SHIFT+10)) |
a3b51d37 | 439 | |
bbe252da | 440 | /* Copy and tainted info */ |
6c5474e8 | 441 | # define RXf_COPY_DONE (1U<<(RXf_BASE_SHIFT+11)) |
ef07e810 | 442 | |
1738e041 | 443 | /* post-execution: $1 et al are tainted */ |
6c5474e8 | 444 | # define RXf_TAINTED_SEEN (1U<<(RXf_BASE_SHIFT+12)) |
ef07e810 | 445 | /* this pattern was tainted during compilation */ |
6c5474e8 | 446 | # define RXf_TAINTED (1U<<(RXf_BASE_SHIFT+13)) |
52d81aa8 NC |
447 | |
448 | /* Flags indicating special patterns */ | |
6c5474e8 KW |
449 | # define RXf_START_ONLY (1U<<(RXf_BASE_SHIFT+14)) /* Pattern is /^/ */ |
450 | # define RXf_SKIPWHITE (1U<<(RXf_BASE_SHIFT+15)) /* Pattern is for a */ | |
9cba692b | 451 | /* split " " */ |
6c5474e8 KW |
452 | # define RXf_WHITE (1U<<(RXf_BASE_SHIFT+16)) /* Pattern is /\s+/ */ |
453 | # define RXf_NULL (1U<<(RXf_BASE_SHIFT+17)) /* Pattern is // */ | |
0bd51918 KW |
454 | |
455 | /* See comments at the beginning of these defines about adding bits. The | |
456 | * highest bit position should be used, so that if RXf_BASE_SHIFT gets | |
457 | * increased, the #error below will be triggered so that you will be reminded | |
458 | * to adjust things at the other end to keep the bit positions unchanged */ | |
6c5474e8 KW |
459 | # if RXf_BASE_SHIFT+17 > 31 |
460 | # error Too many RXf_PMf bits used. See comments at beginning of these for what to do | |
461 | # endif | |
c737faaf | 462 | |
cb5027f2 | 463 | /* |
eb2624c9 FC |
464 | * NOTE: if you modify any RXf flags you should run regen.pl or |
465 | * regen/regcomp.pl so that regnodes.h is updated with the changes. | |
cb5027f2 YO |
466 | * |
467 | */ | |
bbe252da | 468 | |
6c5474e8 KW |
469 | # ifdef NO_TAINT_SUPPORT |
470 | # define RX_ISTAINTED(rx_sv) 0 | |
471 | # define RXp_ISTAINTED(prog) 0 | |
472 | # define RX_TAINT_on(rx_sv) NOOP | |
473 | # define RXp_MATCH_TAINTED(prog) 0 | |
474 | # define RX_MATCH_TAINTED(rx_sv) 0 | |
475 | # define RXp_MATCH_TAINTED_on(prog) NOOP | |
476 | # define RX_MATCH_TAINTED_on(rx_sv) NOOP | |
477 | # define RXp_MATCH_TAINTED_off(prog) NOOP | |
478 | # define RX_MATCH_TAINTED_off(rx_sv) NOOP | |
479 | # else | |
480 | # define RX_ISTAINTED(rx_sv) (RX_EXTFLAGS(rx_sv) & RXf_TAINTED) | |
481 | # define RXp_ISTAINTED(prog) (RXp_EXTFLAGS(prog) & RXf_TAINTED) | |
482 | # define RX_TAINT_on(rx_sv) (RX_EXTFLAGS(rx_sv) |= RXf_TAINTED) | |
483 | # define RXp_MATCH_TAINTED(prog) (RXp_EXTFLAGS(prog) & RXf_TAINTED_SEEN) | |
484 | # define RX_MATCH_TAINTED(rx_sv) (RX_EXTFLAGS(rx_sv) & RXf_TAINTED_SEEN) | |
485 | # define RXp_MATCH_TAINTED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_TAINTED_SEEN) | |
486 | # define RX_MATCH_TAINTED_on(rx_sv) (RX_EXTFLAGS(rx_sv) |= RXf_TAINTED_SEEN) | |
487 | # define RXp_MATCH_TAINTED_off(prog) (RXp_EXTFLAGS(prog) &= ~RXf_TAINTED_SEEN) | |
488 | # define RX_MATCH_TAINTED_off(rx_sv) (RX_EXTFLAGS(rx_sv) &= ~RXf_TAINTED_SEEN) | |
489 | # endif | |
490 | ||
491 | # define RXp_HAS_CUTGROUP(prog) ((prog)->intflags & PREGf_CUTGROUP_SEEN) | |
492 | ||
493 | # define RX_MATCH_TAINTED_set(rx_sv, t) ((t) \ | |
a885a8e0 DM |
494 | ? RX_MATCH_TAINTED_on(rx_sv) \ |
495 | : RX_MATCH_TAINTED_off(rx_sv)) | |
496 | ||
6c5474e8 KW |
497 | # define RXp_MATCH_COPIED(prog) (RXp_EXTFLAGS(prog) & RXf_COPY_DONE) |
498 | # define RX_MATCH_COPIED(rx_sv) (RX_EXTFLAGS(rx_sv) & RXf_COPY_DONE) | |
499 | # define RXp_MATCH_COPIED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_COPY_DONE) | |
500 | # define RX_MATCH_COPIED_on(rx_sv) (RX_EXTFLAGS(rx_sv) |= RXf_COPY_DONE) | |
501 | # define RXp_MATCH_COPIED_off(prog) (RXp_EXTFLAGS(prog) &= ~RXf_COPY_DONE) | |
502 | # define RX_MATCH_COPIED_off(rx_sv) (RX_EXTFLAGS(rx_sv) &= ~RXf_COPY_DONE) | |
503 | # define RX_MATCH_COPIED_set(rx_sv,t) ((t) \ | |
a885a8e0 DM |
504 | ? RX_MATCH_COPIED_on(rx_sv) \ |
505 | : RX_MATCH_COPIED_off(rx_sv)) | |
506 | ||
6c5474e8 KW |
507 | # define RXp_EXTFLAGS(rx) ((rx)->extflags) |
508 | # define RXp_COMPFLAGS(rx) ((rx)->compflags) | |
866c78d1 | 509 | |
07bc277f | 510 | /* For source compatibility. We used to store these explicitly. */ |
6c5474e8 | 511 | # define RX_PRECOMP(rx_sv) (RX_WRAPPED(rx_sv) \ |
a885a8e0 | 512 | + ReANY(rx_sv)->pre_prefix) |
6c5474e8 | 513 | # define RX_PRECOMP_const(rx_sv) (RX_WRAPPED_const(rx_sv) \ |
a885a8e0 | 514 | + ReANY(rx_sv)->pre_prefix) |
5509d87a NC |
515 | /* FIXME? Are we hardcoding too much here and constraining plugin extension |
516 | writers? Specifically, the value 1 assumes that the wrapped version always | |
517 | has exactly one character at the end, a ')'. Will that always be true? */ | |
6c5474e8 | 518 | # define RX_PRELEN(rx_sv) (RX_WRAPLEN(rx_sv) \ |
a885a8e0 DM |
519 | - ReANY(rx_sv)->pre_prefix - 1) |
520 | ||
6c5474e8 KW |
521 | # define RX_WRAPPED(rx_sv) SvPVX(rx_sv) |
522 | # define RX_WRAPPED_const(rx_sv) SvPVX_const(rx_sv) | |
523 | # define RX_WRAPLEN(rx_sv) SvCUR(rx_sv) | |
524 | # define RX_CHECK_SUBSTR(rx_sv) (ReANY(rx_sv)->check_substr) | |
525 | # define RX_REFCNT(rx_sv) SvREFCNT(rx_sv) | |
526 | # define RX_EXTFLAGS(rx_sv) RXp_EXTFLAGS(ReANY(rx_sv)) | |
527 | # define RX_COMPFLAGS(rx_sv) RXp_COMPFLAGS(ReANY(rx_sv)) | |
528 | # define RXp_ENGINE(prog) ((prog)->engine) | |
529 | # define RX_ENGINE(rx_sv) (RXp_ENGINE(ReANY(rx_sv))) | |
530 | # define RXp_SUBBEG(prog) (prog->subbeg) | |
531 | # define RX_SUBBEG(rx_sv) (RXp_SUBBEG(ReANY(rx_sv))) | |
532 | # define RXp_SUBOFFSET(prog) (prog->suboffset) | |
533 | # define RX_SUBOFFSET(rx_sv) (RXp_SUBOFFSET(ReANY(rx_sv))) | |
534 | # define RX_SUBCOFFSET(rx_sv) (ReANY(rx_sv)->subcoffset) | |
535 | # define RXp_OFFS(prog) (prog->offs) | |
536 | # define RX_OFFS(rx_sv) (RXp_OFFS(ReANY(rx_sv))) | |
537 | # define RXp_NPARENS(prog) (prog->nparens) | |
538 | # define RX_NPARENS(rx_sv) (RXp_NPARENS(ReANY(rx_sv))) | |
539 | # define RX_SUBLEN(rx_sv) (ReANY(rx_sv)->sublen) | |
540 | # define RXp_MINLEN(prog) (prog->minlen) | |
541 | # define RX_MINLEN(rx_sv) (RXp_MINLEN(ReANY(rx_sv))) | |
542 | # define RXp_MINLENRET(prog) (prog->minlenret) | |
543 | # define RX_MINLENRET(rx_sv) (RXp_MINLENRET(ReANY(rx_sv))) | |
544 | # define RXp_GOFS(prog) (prog->gofs) | |
545 | # define RX_GOFS(rx_sv) (RXp_GOFS(ReANY(rx_sv))) | |
546 | # define RX_LASTPAREN(rx_sv) (ReANY(rx_sv)->lastparen) | |
547 | # define RX_LASTCLOSEPAREN(rx_sv) (ReANY(rx_sv)->lastcloseparen) | |
548 | # define RXp_SAVED_COPY(prog) (prog->saved_copy) | |
549 | # define RX_SAVED_COPY(rx_sv) (RXp_SAVED_COPY(ReANY(rx_sv))) | |
03c83e26 | 550 | /* last match was zero-length */ |
6c5474e8 | 551 | # define RXp_ZERO_LEN(prog) \ |
196a02af DM |
552 | (RXp_OFFS(prog)[0].start + (SSize_t)RXp_GOFS(prog) \ |
553 | == RXp_OFFS(prog)[0].end) | |
6c5474e8 | 554 | # define RX_ZERO_LEN(rx_sv) (RXp_ZERO_LEN(ReANY(rx_sv))) |
220fc49f | 555 | |
be8e71aa YO |
556 | #endif /* PLUGGABLE_RE_EXTENSION */ |
557 | ||
486ec47a | 558 | /* Stuff that needs to be included in the pluggable extension goes below here */ |
be8e71aa | 559 | |
db2c6cb3 | 560 | #ifdef PERL_ANY_COW |
6c5474e8 | 561 | # define RXp_MATCH_COPY_FREE(prog) \ |
196a02af DM |
562 | STMT_START {if (RXp_SAVED_COPY(prog)) { \ |
563 | SV_CHECK_THINKFIRST_COW_DROP(RXp_SAVED_COPY(prog)); \ | |
ed252734 | 564 | } \ |
196a02af DM |
565 | if (RXp_MATCH_COPIED(prog)) { \ |
566 | Safefree(RXp_SUBBEG(prog)); \ | |
567 | RXp_MATCH_COPIED_off(prog); \ | |
ed252734 NC |
568 | }} STMT_END |
569 | #else | |
6c5474e8 | 570 | # define RXp_MATCH_COPY_FREE(prog) \ |
196a02af DM |
571 | STMT_START {if (RXp_MATCH_COPIED(prog)) { \ |
572 | Safefree(RXp_SUBBEG(prog)); \ | |
573 | RXp_MATCH_COPIED_off(prog); \ | |
ed252734 NC |
574 | }} STMT_END |
575 | #endif | |
a8cb1947 | 576 | #define RX_MATCH_COPY_FREE(rx_sv) RXp_MATCH_COPY_FREE(ReANY(rx_sv)) |
ed252734 | 577 | |
a885a8e0 DM |
578 | #define RXp_MATCH_UTF8(prog) (RXp_EXTFLAGS(prog) & RXf_MATCH_UTF8) |
579 | #define RX_MATCH_UTF8(rx_sv) (RX_EXTFLAGS(rx_sv) & RXf_MATCH_UTF8) | |
196a02af | 580 | #define RXp_MATCH_UTF8_on(prog) (RXp_EXTFLAGS(prog) |= RXf_MATCH_UTF8) |
97f6857b | 581 | #define RX_MATCH_UTF8_on(rx_sv) (RXp_MATCH_UTF8_on(ReANY(rx_sv))) |
196a02af DM |
582 | #define RXp_MATCH_UTF8_off(prog) (RXp_EXTFLAGS(prog) &= ~RXf_MATCH_UTF8) |
583 | #define RX_MATCH_UTF8_off(rx_sv) (RXp_MATCH_UTF8_off(ReANY(rx_sv)) | |
584 | #define RXp_MATCH_UTF8_set(prog, t) ((t) \ | |
585 | ? RXp_MATCH_UTF8_on(prog) \ | |
586 | : RXp_MATCH_UTF8_off(prog)) | |
587 | #define RX_MATCH_UTF8_set(rx_sv, t) (RXp_MATCH_UTF8_set(ReANY(rx_sv), t)) | |
efd26800 NC |
588 | |
589 | /* Whether the pattern stored at RX_WRAPPED is in UTF-8 */ | |
a885a8e0 | 590 | #define RX_UTF8(rx_sv) SvUTF8(rx_sv) |
7948fc08 | 591 | |
a340edde DM |
592 | |
593 | /* bits in flags arg of Perl_regexec_flags() */ | |
594 | ||
595 | #define REXEC_COPY_STR 0x01 /* Need to copy the string for captures. */ | |
596 | #define REXEC_CHECKED 0x02 /* re_intuit_start() already called. */ | |
597 | #define REXEC_SCREAM 0x04 /* currently unused. */ | |
598 | #define REXEC_IGNOREPOS 0x08 /* use stringarg, not pos(), for \G match */ | |
599 | #define REXEC_NOT_FIRST 0x10 /* This is another iteration of //g: | |
600 | no need to copy string again */ | |
601 | ||
602 | /* under REXEC_COPY_STR, it's ok for the | |
603 | engine (modulo PL_sawamperand etc) | |
604 | to skip copying: ... */ | |
605 | #define REXEC_COPY_SKIP_PRE 0x20 /* ...the $` part of the string, or */ | |
606 | #define REXEC_COPY_SKIP_POST 0x40 /* ...the $' part of the string */ | |
d5e7783a DM |
607 | #define REXEC_FAIL_ON_UNDERFLOW 0x80 /* fail the match if $& would start before |
608 | the start pos (so s/.\G// would fail | |
609 | on second iteration */ | |
c277df42 | 610 | |
041c1a23 | 611 | #if defined(PERL_USE_GCC_BRACE_GROUPS) |
288b8c02 NC |
612 | # define ReREFCNT_inc(re) \ |
613 | ({ \ | |
614 | /* This is here to generate a casting warning if incorrect. */ \ | |
7948fc08 RU |
615 | REGEXP *const _rerefcnt_inc = (re); \ |
616 | assert(SvTYPE(_rerefcnt_inc) == SVt_REGEXP); \ | |
617 | SvREFCNT_inc(_rerefcnt_inc); \ | |
618 | _rerefcnt_inc; \ | |
288b8c02 NC |
619 | }) |
620 | # define ReREFCNT_dec(re) \ | |
621 | ({ \ | |
622 | /* This is here to generate a casting warning if incorrect. */ \ | |
7948fc08 RU |
623 | REGEXP *const _rerefcnt_dec = (re); \ |
624 | SvREFCNT_dec(_rerefcnt_dec); \ | |
288b8c02 NC |
625 | }) |
626 | #else | |
627 | # define ReREFCNT_dec(re) SvREFCNT_dec(re) | |
b7e0bd9e | 628 | # define ReREFCNT_inc(re) ((REGEXP *) SvREFCNT_inc(re)) |
288b8c02 | 629 | #endif |
c9182d9c | 630 | #define ReANY(re) Perl_ReANY((const REGEXP *)(re)) |
288b8c02 NC |
631 | |
632 | /* FIXME for plugins. */ | |
cf93c79d IZ |
633 | |
634 | #define FBMcf_TAIL_DOLLAR 1 | |
cad2e5aa JH |
635 | #define FBMcf_TAIL_DOLLARM 2 |
636 | #define FBMcf_TAIL_Z 4 | |
637 | #define FBMcf_TAIL_z 8 | |
638 | #define FBMcf_TAIL (FBMcf_TAIL_DOLLAR|FBMcf_TAIL_DOLLARM|FBMcf_TAIL_Z|FBMcf_TAIL_z) | |
cf93c79d IZ |
639 | |
640 | #define FBMrf_MULTILINE 1 | |
cad2e5aa | 641 | |
331b2dcc DM |
642 | struct regmatch_state; |
643 | struct regmatch_slab; | |
8adc0f72 | 644 | |
bf2039a9 DM |
645 | /* like regmatch_info_aux, but contains extra fields only needed if the |
646 | * pattern contains (?{}). If used, is snuck into the second slot in the | |
647 | * regmatch_state stack at the start of execution */ | |
8adc0f72 DM |
648 | |
649 | typedef struct { | |
650 | regexp *rex; | |
651 | PMOP *curpm; /* saved PL_curpm */ | |
652 | #ifdef PERL_ANY_COW | |
653 | SV *saved_copy; /* saved saved_copy field from rex */ | |
654 | #endif | |
655 | char *subbeg; /* saved subbeg field from rex */ | |
656 | STRLEN sublen; /* saved sublen field from rex */ | |
657 | STRLEN suboffset; /* saved suboffset field from rex */ | |
658 | STRLEN subcoffset; /* saved subcoffset field from rex */ | |
1d48e83d | 659 | SV *sv; /* $_ during (?{}) */ |
8adc0f72 | 660 | MAGIC *pos_magic; /* pos() magic attached to $_ */ |
ea3daa5d | 661 | SSize_t pos; /* the original value of pos() in pos_magic */ |
25fdce4a | 662 | U8 pos_flags; /* flags to be restored; currently only MGf_BYTES*/ |
bf2039a9 DM |
663 | } regmatch_info_aux_eval; |
664 | ||
665 | ||
666 | /* fields that logically live in regmatch_info, but which need cleaning | |
667 | * up on croak(), and so are instead are snuck into the first slot in | |
668 | * the regmatch_state stack at the start of execution */ | |
669 | ||
670 | typedef struct { | |
671 | regmatch_info_aux_eval *info_aux_eval; | |
331b2dcc DM |
672 | struct regmatch_state *old_regmatch_state; /* saved PL_regmatch_state */ |
673 | struct regmatch_slab *old_regmatch_slab; /* saved PL_regmatch_slab */ | |
2ac8ff4b | 674 | char *poscache; /* S-L cache of fail positions of WHILEMs */ |
bf2039a9 DM |
675 | } regmatch_info_aux; |
676 | ||
8adc0f72 | 677 | |
3b0527fe | 678 | /* some basic information about the current match that is created by |
bf2039a9 DM |
679 | * Perl_regexec_flags and then passed to regtry(), regmatch() etc. |
680 | * It is allocated as a local var on the stack, so nothing should be | |
681 | * stored in it that needs preserving or clearing up on croak(). | |
682 | * For that, see the aux_info and aux_info_eval members of the | |
683 | * regmatch_state union. */ | |
3b0527fe DM |
684 | |
685 | typedef struct { | |
28d03b21 | 686 | REGEXP *prog; /* the regex being executed */ |
9d9163fb | 687 | const char * strbeg; /* real start of string */ |
28d03b21 DM |
688 | char *strend; /* one byte beyond last char of match string */ |
689 | char *till; /* matches shorter than this fail (see minlen arg) */ | |
690 | SV *sv; /* the SV string currently being matched */ | |
691 | char *ganch; /* position of \G anchor */ | |
692 | char *cutpoint; /* (*COMMIT) position (if any) */ | |
bf2039a9 DM |
693 | regmatch_info_aux *info_aux; /* extra fields that need cleanup */ |
694 | regmatch_info_aux_eval *info_aux_eval; /* extra saved state for (?{}) */ | |
1cb48e53 DM |
695 | I32 poscache_maxiter; /* how many whilems todo before S-L cache kicks in */ |
696 | I32 poscache_iter; /* current countdown from _maxiter to zero */ | |
2ac8ff4b | 697 | STRLEN poscache_size; /* size of regmatch_info_aux.poscache */ |
02d5137b | 698 | bool intuit; /* re_intuit_start() is the top-level caller */ |
ba44c216 DM |
699 | bool is_utf8_pat; /* regex is utf8 */ |
700 | bool is_utf8_target; /* string being matched is utf8 */ | |
39819bd9 | 701 | bool warned; /* we have issued a recursion warning; no need for more */ |
3b0527fe DM |
702 | } regmatch_info; |
703 | ||
5d9a96ca DM |
704 | |
705 | /* structures for holding and saving the state maintained by regmatch() */ | |
706 | ||
d56b3014 | 707 | #ifndef MAX_RECURSE_EVAL_NOCHANGE_DEPTH |
6c5474e8 | 708 | # define MAX_RECURSE_EVAL_NOCHANGE_DEPTH 10 |
d56b3014 | 709 | #endif |
6bda09f9 | 710 | |
5d9a96ca DM |
711 | typedef I32 CHECKPOINT; |
712 | ||
a0374537 | 713 | typedef struct regmatch_state { |
40a82448 | 714 | int resume_state; /* where to jump to on return */ |
24d3c4a9 | 715 | char *locinput; /* where to backtrack in string on failure */ |
fd1dd2eb | 716 | char *loceol; |
8e9f3eef | 717 | U8 *sr0; /* position of start of script run, or NULL */ |
e822a8b4 DM |
718 | |
719 | union { | |
77cb431f | 720 | |
bf2039a9 DM |
721 | /* the 'info_aux' and 'info_aux_eval' union members are cuckoos in |
722 | * the nest. They aren't saved backtrack state; rather they | |
723 | * represent one or two extra chunks of data that need allocating | |
724 | * at the start of a match. These fields would logically live in | |
725 | * the regmatch_info struct, except that is allocated on the | |
726 | * C stack, and these fields are all things that require cleanup | |
727 | * after a croak(), when the stack is lost. | |
728 | * As a convenience, we just use the first 1 or 2 regmatch_state | |
729 | * slots to store this info, as we will be allocating a slab of | |
730 | * these anyway. Otherwise we'd have to malloc and then free them, | |
731 | * or allocate them on the save stack (where they will get | |
732 | * realloced if the save stack grows). | |
733 | * info_aux contains the extra fields that are always needed; | |
734 | * info_aux_eval contains extra fields that only needed if | |
735 | * the pattern contains code blocks | |
736 | * We split them into two separate structs to avoid increasing | |
737 | * the size of the union. | |
738 | */ | |
739 | ||
740 | regmatch_info_aux info_aux; | |
741 | ||
742 | regmatch_info_aux_eval info_aux_eval; | |
743 | ||
77cb431f DM |
744 | /* this is a fake union member that matches the first element |
745 | * of each member that needs to store positive backtrack | |
746 | * information */ | |
747 | struct { | |
748 | struct regmatch_state *prev_yes_state; | |
749 | } yes; | |
750 | ||
fae667d5 YO |
751 | /* branchlike members */ |
752 | /* this is a fake union member that matches the first elements | |
753 | * of each member that needs to behave like a branch */ | |
754 | struct { | |
5d458dd8 YO |
755 | /* this first element must match u.yes */ |
756 | struct regmatch_state *prev_yes_state; | |
fae667d5 | 757 | U32 lastparen; |
f6033a9d | 758 | U32 lastcloseparen; |
fae667d5 YO |
759 | CHECKPOINT cp; |
760 | ||
761 | } branchlike; | |
762 | ||
763 | struct { | |
764 | /* the first elements must match u.branchlike */ | |
765 | struct regmatch_state *prev_yes_state; | |
766 | U32 lastparen; | |
f6033a9d | 767 | U32 lastcloseparen; |
fae667d5 YO |
768 | CHECKPOINT cp; |
769 | ||
770 | regnode *next_branch; /* next branch node */ | |
771 | } branch; | |
772 | ||
773 | struct { | |
774 | /* the first elements must match u.branchlike */ | |
775 | struct regmatch_state *prev_yes_state; | |
776 | U32 lastparen; | |
f6033a9d | 777 | U32 lastcloseparen; |
fae667d5 YO |
778 | CHECKPOINT cp; |
779 | ||
2e64971a | 780 | U32 accepted; /* how many accepting states left */ |
6603fe3e | 781 | bool longfold;/* saw a fold with a 1->n char mapping */ |
7f69552c | 782 | U16 *jump; /* positive offsets from me */ |
7f69552c | 783 | regnode *me; /* Which node am I - needed for jump tries*/ |
2e64971a DM |
784 | U8 *firstpos;/* pos in string of first trie match */ |
785 | U32 firstchars;/* len in chars of firstpos from start */ | |
786 | U16 nextword;/* next word to try */ | |
787 | U16 topword; /* longest accepted word */ | |
e822a8b4 DM |
788 | } trie; |
789 | ||
fae667d5 YO |
790 | /* special types - these members are used to store state for special |
791 | regops like eval, if/then, lookaround and the markpoint state */ | |
e822a8b4 | 792 | struct { |
77cb431f DM |
793 | /* this first element must match u.yes */ |
794 | struct regmatch_state *prev_yes_state; | |
faec1544 | 795 | struct regmatch_state *prev_curlyx; |
d1c49ad5 | 796 | struct regmatch_state *prev_eval; |
288b8c02 | 797 | REGEXP *prev_rex; |
aa283a38 DM |
798 | CHECKPOINT cp; /* remember current savestack indexes */ |
799 | CHECKPOINT lastcp; | |
24be3102 | 800 | U32 close_paren; /* which close bracket is our end (+1) */ |
1b5c067c | 801 | regnode *B; /* the node following us */ |
ba6840fb | 802 | char *prev_recurse_locinput; |
e822a8b4 DM |
803 | } eval; |
804 | ||
805 | struct { | |
c476f425 | 806 | /* this first element must match u.yes */ |
262b90c4 | 807 | struct regmatch_state *prev_yes_state; |
fae667d5 YO |
808 | I32 wanted; |
809 | I32 logical; /* saved copy of 'logical' var */ | |
2abbd513 KW |
810 | U8 count; /* number of beginning positions */ |
811 | char *start; | |
812 | char *end; | |
fae667d5 YO |
813 | regnode *me; /* the IFMATCH/SUSPEND/UNLESSM node */ |
814 | } ifmatch; /* and SUSPEND/UNLESSM */ | |
815 | ||
816 | struct { | |
817 | /* this first element must match u.yes */ | |
818 | struct regmatch_state *prev_yes_state; | |
819 | struct regmatch_state *prev_mark; | |
820 | SV* mark_name; | |
821 | char *mark_loc; | |
822 | } mark; | |
823 | ||
824 | struct { | |
825 | int val; | |
826 | } keeper; | |
827 | ||
828 | /* quantifiers - these members are used for storing state for | |
a3815e44 | 829 | the regops used to implement quantifiers */ |
fae667d5 YO |
830 | struct { |
831 | /* this first element must match u.yes */ | |
832 | struct regmatch_state *prev_yes_state; | |
c476f425 | 833 | struct regmatch_state *prev_curlyx; /* previous cur_curlyx */ |
d02d6d97 DM |
834 | regnode *me; /* the CURLYX node */ |
835 | regnode *B; /* the B node in /A*B/ */ | |
c476f425 DM |
836 | CHECKPOINT cp; /* remember current savestack index */ |
837 | bool minmod; | |
a0374537 | 838 | int parenfloor;/* how far back to strip paren data */ |
c476f425 DM |
839 | |
840 | /* these two are modified by WHILEM */ | |
841 | int count; /* how many instances of A we've matched */ | |
842 | char *lastloc;/* where previous A matched (0-len detect) */ | |
e822a8b4 DM |
843 | } curlyx; |
844 | ||
845 | struct { | |
c476f425 | 846 | /* this first element must match u.yes */ |
262b90c4 | 847 | struct regmatch_state *prev_yes_state; |
c476f425 DM |
848 | struct regmatch_state *save_curlyx; |
849 | CHECKPOINT cp; /* remember current savestack indexes */ | |
850 | CHECKPOINT lastcp; | |
851 | char *save_lastloc; /* previous curlyx.lastloc */ | |
852 | I32 cache_offset; | |
853 | I32 cache_mask; | |
e822a8b4 DM |
854 | } whilem; |
855 | ||
856 | struct { | |
5d458dd8 YO |
857 | /* this first element must match u.yes */ |
858 | struct regmatch_state *prev_yes_state; | |
79a2a0e8 | 859 | int c1, c2; /* case fold search */ |
40a82448 | 860 | CHECKPOINT cp; |
f6033a9d DM |
861 | U32 lastparen; |
862 | U32 lastcloseparen; | |
40a82448 DM |
863 | I32 alen; /* length of first-matched A string */ |
864 | I32 count; | |
0cadcf80 | 865 | bool minmod; |
40a82448 DM |
866 | regnode *A, *B; /* the nodes corresponding to /A*B/ */ |
867 | regnode *me; /* the curlym node */ | |
79a2a0e8 KW |
868 | U8 c1_utf8[UTF8_MAXBYTES+1]; /* */ |
869 | U8 c2_utf8[UTF8_MAXBYTES+1]; | |
e822a8b4 DM |
870 | } curlym; |
871 | ||
872 | struct { | |
3b6647e0 | 873 | U32 paren; |
c255a977 | 874 | CHECKPOINT cp; |
f6033a9d DM |
875 | U32 lastparen; |
876 | U32 lastcloseparen; | |
79a2a0e8 | 877 | int c1, c2; /* case fold search */ |
c255a977 DM |
878 | char *maxpos; /* highest possible point in string to match */ |
879 | char *oldloc; /* the previous locinput */ | |
e822a8b4 | 880 | int count; |
c255a977 DM |
881 | int min, max; /* {m,n} */ |
882 | regnode *A, *B; /* the nodes corresponding to /A*B/ */ | |
79a2a0e8 KW |
883 | U8 c1_utf8[UTF8_MAXBYTES+1]; /* */ |
884 | U8 c2_utf8[UTF8_MAXBYTES+1]; | |
c255a977 | 885 | } curly; /* and CURLYN/PLUS/STAR */ |
dad79028 | 886 | |
d8319b27 | 887 | } u; |
5d9a96ca DM |
888 | } regmatch_state; |
889 | ||
ce12e254 | 890 | |
d5a00e4a | 891 | |
5d9a96ca DM |
892 | /* how many regmatch_state structs to allocate as a single slab. |
893 | * We do it in 4K blocks for efficiency. The "3" is 2 for the next/prev | |
894 | * pointers, plus 1 for any mythical malloc overhead. */ | |
895 | ||
896 | #define PERL_REGMATCH_SLAB_SLOTS \ | |
897 | ((4096 - 3 * sizeof (void*)) / sizeof(regmatch_state)) | |
898 | ||
899 | typedef struct regmatch_slab { | |
900 | regmatch_state states[PERL_REGMATCH_SLAB_SLOTS]; | |
901 | struct regmatch_slab *prev, *next; | |
902 | } regmatch_slab; | |
1ade1aa1 | 903 | |
46ab3289 | 904 | |
cde0cee5 | 905 | |
1ade1aa1 | 906 | /* |
14d04a33 | 907 | * ex: set ts=8 sts=4 sw=4 et: |
1ade1aa1 | 908 | */ |