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pp_subst: don't use REXEC_COPY_STR on 2nd match
[perl5.git] / regexp.h
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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
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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
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38struct reg_substr_datum {
39 I32 min_offset;
40 I32 max_offset;
41 SV *substr; /* non-utf8 variant */
42 SV *utf8_substr; /* utf8 variant */
43 I32 end_shift;
44};
45struct reg_substr_data {
46 struct reg_substr_datum data[3]; /* Actual array */
47};
f9f4320a 48
db2c6cb3 49#ifdef PERL_ANY_COW
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50#define SV_SAVED_COPY SV *saved_copy; /* If non-NULL, SV which is COW from original */
51#else
52#define SV_SAVED_COPY
ed252734 53#endif
28d8d7f4 54
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55/* offsets within a string of a particular /(.)/ capture */
56
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57typedef struct regexp_paren_pair {
58 I32 start;
59 I32 end;
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60 /* 'start_tmp' records a new opening position before the matching end
61 * has been found, so that the old start and end values are still
62 * valid, e.g.
63 * "abc" =~ /(.(?{print "[$1]"}))+/
64 *outputs [][a][b]
65 * This field is not part of the API. */
1ca2007e 66 I32 start_tmp;
f0ab9afb 67} regexp_paren_pair;
28d8d7f4 68
52ae8f7e 69#if defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_UTF8_C)
164173a2 70#define _invlist_union(a, b, output) _invlist_union_maybe_complement_2nd(a, b, FALSE, output)
52ae8f7e 71#define _invlist_intersection(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, FALSE, output)
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72
73/* Subtracting b from a leaves in a everything that was there that isn't in b,
74 * that is the intersection of a with b's complement */
75#define _invlist_subtract(a, b, output) _invlist_intersection_maybe_complement_2nd(a, b, TRUE, output)
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76#endif
77
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78/* record the position of a (?{...}) within a pattern */
79
80struct reg_code_block {
81 STRLEN start;
82 STRLEN end;
83 OP *block;
b30fcab9 84 REGEXP *src_regex;
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85};
86
87
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88/*
89 The regexp/REGEXP struct, see L<perlreapi> for further documentation
90 on the individual fields. The struct is ordered so that the most
91 commonly used fields are placed at the start.
92
93 Any patch that adds items to this struct will need to include
94 changes to F<sv.c> (C<Perl_re_dup()>) and F<regcomp.c>
95 (C<pregfree()>). This involves freeing or cloning items in the
96 regexp's data array based on the data item's type.
97*/
98
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99#define _REGEXP_COMMON \
100 /* what engine created this regexp? */ \
101 const struct regexp_engine* engine; \
102 REGEXP *mother_re; /* what re is this a lightweight copy of? */ \
89f6f287 103 HV *paren_names; /* Optional hash of paren names */ \
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104 /* Information about the match that the perl core uses to */ \
105 /* manage things */ \
106 U32 extflags; /* Flags used both externally and internally */ \
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107 I32 minlen; /* mininum possible number of chars in string to match */\
108 I32 minlenret; /* mininum possible number of chars in $& */ \
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109 U32 gofs; /* chars left of pos that we search from */ \
110 /* substring data about strings that must appear in the */ \
111 /* final match, used for optimisations */ \
112 struct reg_substr_data *substrs; \
113 U32 nparens; /* number of capture buffers */ \
114 /* private engine specific data */ \
115 U32 intflags; /* Engine Specific Internal flags */ \
116 void *pprivate; /* Data private to the regex engine which */ \
117 /* created this object. */ \
118 /* Data about the last/current match. These are modified */ \
119 /* during matching */ \
120 U32 lastparen; /* last open paren matched */ \
121 U32 lastcloseparen; /* last close paren matched */ \
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122 /* Array of offsets for (@-) and (@+) */ \
123 regexp_paren_pair *offs; \
124 /* saved or original string so \digit works forever. */ \
125 char *subbeg; \
126 SV_SAVED_COPY /* If non-NULL, SV which is COW from original */\
127 I32 sublen; /* Length of string pointed by subbeg */ \
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128 I32 suboffset; /* byte offset of subbeg from logical start of str */ \
129 I32 subcoffset; /* suboffset equiv, but in chars (for @-/@+) */ \
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130 /* Information about the match that isn't often used */ \
131 /* offset from wrapped to the start of precomp */ \
654eccd5 132 PERL_BITFIELD32 pre_prefix:4; \
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133 /* original flags used to compile the pattern, may differ */ \
134 /* from extflags in various ways */ \
135 PERL_BITFIELD32 compflags:9; \
b82ad30c 136 CV *qr_anoncv /* the anon sub wrapped round qr/(?{..})/ */
08e44740 137
bbe252da 138typedef struct regexp {
288b8c02 139 _XPV_HEAD;
08e44740 140 _REGEXP_COMMON;
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141} regexp;
142
89f6f287 143#define RXp_PAREN_NAMES(rx) ((rx)->paren_names)
5daac39c 144
785a26d5 145/* used for high speed searches */
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146typedef struct re_scream_pos_data_s
147{
148 char **scream_olds; /* match pos */
149 I32 *scream_pos; /* Internal iterator of scream. */
150} re_scream_pos_data;
151
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152/* regexp_engine structure. This is the dispatch table for regexes.
153 * Any regex engine implementation must be able to build one of these.
154 */
f9f4320a 155typedef struct regexp_engine {
1593ad57 156 REGEXP* (*comp) (pTHX_ SV * const pattern, U32 flags);
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157 I32 (*exec) (pTHX_ REGEXP * const rx, char* stringarg, char* strend,
158 char* strbeg, I32 minend, SV* screamer,
159 void* data, U32 flags);
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160 char* (*intuit) (pTHX_
161 REGEXP * const rx,
162 SV *sv,
163 const char * const strbeg,
164 char *strpos,
165 char *strend,
166 const U32 flags,
9f61653a 167 re_scream_pos_data *data);
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168 SV* (*checkstr) (pTHX_ REGEXP * const rx);
169 void (*free) (pTHX_ REGEXP * const rx);
2fdbfb4d 170 void (*numbered_buff_FETCH) (pTHX_ REGEXP * const rx, const I32 paren,
192b9cd1 171 SV * const sv);
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172 void (*numbered_buff_STORE) (pTHX_ REGEXP * const rx, const I32 paren,
173 SV const * const value);
174 I32 (*numbered_buff_LENGTH) (pTHX_ REGEXP * const rx, const SV * const sv,
175 const I32 paren);
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176 SV* (*named_buff) (pTHX_ REGEXP * const rx, SV * const key,
177 SV * const value, const U32 flags);
178 SV* (*named_buff_iter) (pTHX_ REGEXP * const rx, const SV * const lastkey,
179 const U32 flags);
49d7dfbc 180 SV* (*qr_package)(pTHX_ REGEXP * const rx);
f2f78491 181#ifdef USE_ITHREADS
49d7dfbc 182 void* (*dupe) (pTHX_ REGEXP * const rx, CLONE_PARAMS *param);
2fdbfb4d 183#endif
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184 REGEXP* (*op_comp) (pTHX_ SV ** const patternp, int pat_count,
185 OP *expr, const struct regexp_engine* eng,
186 REGEXP *VOL old_re,
76ac488f 187 bool *is_bare_re, U32 orig_rx_flags, U32 pm_flags);
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188} regexp_engine;
189
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190/*
191 These are passed to the numbered capture variable callbacks as the
192 paren name. >= 1 is reserved for actual numbered captures, i.e. $1,
193 $2 etc.
194*/
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195#define RX_BUFF_IDX_CARET_PREMATCH -5 /* ${^PREMATCH} */
196#define RX_BUFF_IDX_CARET_POSTMATCH -4 /* ${^POSTMATCH} */
197#define RX_BUFF_IDX_CARET_FULLMATCH -3 /* ${^MATCH} */
198#define RX_BUFF_IDX_PREMATCH -2 /* $` */
199#define RX_BUFF_IDX_POSTMATCH -1 /* $' */
200#define RX_BUFF_IDX_FULLMATCH 0 /* $& */
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201
202/*
203 Flags that are passed to the named_buff and named_buff_iter
204 callbacks above. Those routines are called from universal.c via the
205 Tie::Hash::NamedCapture interface for %+ and %- and the re::
206 functions in the same file.
207*/
208
209/* The Tie::Hash::NamedCapture operation this is part of, if any */
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210#define RXapif_FETCH 0x0001
211#define RXapif_STORE 0x0002
212#define RXapif_DELETE 0x0004
213#define RXapif_CLEAR 0x0008
214#define RXapif_EXISTS 0x0010
215#define RXapif_SCALAR 0x0020
216#define RXapif_FIRSTKEY 0x0040
217#define RXapif_NEXTKEY 0x0080
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218
219/* Whether %+ or %- is being operated on */
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220#define RXapif_ONE 0x0100 /* %+ */
221#define RXapif_ALL 0x0200 /* %- */
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222
223/* Whether this is being called from a re:: function */
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224#define RXapif_REGNAME 0x0400
225#define RXapif_REGNAMES 0x0800
7948fc08 226#define RXapif_REGNAMES_COUNT 0x1000
192b9cd1 227
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228/*
229=head1 REGEXP Functions
230
231=for apidoc Am|REGEXP *|SvRX|SV *sv
232
233Convenience macro to get the REGEXP from a SV. This is approximately
234equivalent to the following snippet:
235
236 if (SvMAGICAL(sv))
237 mg_get(sv);
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238 if (SvROK(sv))
239 sv = MUTABLE_SV(SvRV(sv));
240 if (SvTYPE(sv) == SVt_REGEXP)
241 return (REGEXP*) sv;
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242
243NULL will be returned if a REGEXP* is not found.
244
245=for apidoc Am|bool|SvRXOK|SV* sv
246
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247Returns a boolean indicating whether the SV (or the one it references)
248is a REGEXP.
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249
250If you want to do something with the REGEXP* later use SvRX instead
251and check for NULL.
252
253=cut
254*/
255
256#define SvRX(sv) (Perl_get_re_arg(aTHX_ sv))
257#define SvRXOK(sv) (Perl_get_re_arg(aTHX_ sv) ? TRUE : FALSE)
258
259
7948fc08 260/* Flags stored in regexp->extflags
bbe252da 261 * These are used by code external to the regexp engine
e357fc67 262 *
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263 * Note that the flags whose names start with RXf_PMf_ are defined in
264 * op_reg_common.h, being copied from the parallel flags of op_pmflags
cb5027f2 265 *
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266 * NOTE: if you modify any RXf flags you should run regen.pl or
267 * regen/regcomp.pl so that regnodes.h is updated with the changes.
cb5027f2 268 *
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269 */
270
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271#include "op_reg_common.h"
272
cde0cee5 273#define RXf_PMf_STD_PMMOD (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_FOLD|RXf_PMf_EXTENDED)
cde0cee5 274
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275#define CASE_STD_PMMOD_FLAGS_PARSE_SET(pmfl) \
276 case IGNORE_PAT_MOD: *(pmfl) |= RXf_PMf_FOLD; break; \
277 case MULTILINE_PAT_MOD: *(pmfl) |= RXf_PMf_MULTILINE; break; \
278 case SINGLE_PAT_MOD: *(pmfl) |= RXf_PMf_SINGLELINE; break; \
279 case XTENDED_PAT_MOD: *(pmfl) |= RXf_PMf_EXTENDED; break
bbe252da 280
94b03d7d 281/* Note, includes charset ones, assumes 0 is the default for them */
fb85c044 282#define STD_PMMOD_FLAGS_CLEAR(pmfl) \
a62b1201 283 *(pmfl) &= ~(RXf_PMf_FOLD|RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_EXTENDED|RXf_PMf_CHARSET)
fb85c044 284
bcdf7404 285/* chars and strings used as regex pattern modifiers
486ec47a 286 * Singular is a 'c'har, plural is a "string"
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287 *
288 * NOTE, KEEPCOPY was originally 'k', but was changed to 'p' for preserve
289 * for compatibility reasons with Regexp::Common which highjacked (?k:...)
290 * for its own uses. So 'k' is out as well.
bcdf7404 291 */
85508812 292#define DEFAULT_PAT_MOD '^' /* Short for all the default modifiers */
bcdf7404 293#define EXEC_PAT_MOD 'e'
87e95b7f 294#define KEEPCOPY_PAT_MOD 'p'
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295#define ONCE_PAT_MOD 'o'
296#define GLOBAL_PAT_MOD 'g'
297#define CONTINUE_PAT_MOD 'c'
298#define MULTILINE_PAT_MOD 'm'
299#define SINGLE_PAT_MOD 's'
300#define IGNORE_PAT_MOD 'i'
301#define XTENDED_PAT_MOD 'x'
4f4d7508 302#define NONDESTRUCT_PAT_MOD 'r'
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303#define LOCALE_PAT_MOD 'l'
304#define UNICODE_PAT_MOD 'u'
50e91148 305#define DEPENDS_PAT_MOD 'd'
cfaf538b 306#define ASCII_RESTRICT_PAT_MOD 'a'
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307
308#define ONCE_PAT_MODS "o"
87e95b7f 309#define KEEPCOPY_PAT_MODS "p"
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310#define EXEC_PAT_MODS "e"
311#define LOOP_PAT_MODS "gc"
4f4d7508 312#define NONDESTRUCT_PAT_MODS "r"
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313#define LOCALE_PAT_MODS "l"
314#define UNICODE_PAT_MODS "u"
50e91148 315#define DEPENDS_PAT_MODS "d"
cfaf538b 316#define ASCII_RESTRICT_PAT_MODS "a"
df7a8460 317#define ASCII_MORE_RESTRICT_PAT_MODS "aa"
bcdf7404 318
78fecfc8 319/* This string is expected by regcomp.c to be ordered so that the first
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320 * character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of extflags; the next
321 * character is bit +1, etc. */
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322#define STD_PAT_MODS "msix"
323
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324#define CHARSET_PAT_MODS ASCII_RESTRICT_PAT_MODS DEPENDS_PAT_MODS LOCALE_PAT_MODS UNICODE_PAT_MODS
325
78fecfc8 326/* This string is expected by XS_re_regexp_pattern() in universal.c to be ordered
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327 * so that the first character is the flag in bit RXf_PMf_STD_PMMOD_SHIFT of
328 * extflags; the next character is in bit +1, etc. */
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329#define INT_PAT_MODS STD_PAT_MODS KEEPCOPY_PAT_MODS
330
331#define EXT_PAT_MODS ONCE_PAT_MODS KEEPCOPY_PAT_MODS
94b03d7d 332#define QR_PAT_MODS STD_PAT_MODS EXT_PAT_MODS CHARSET_PAT_MODS
bcdf7404 333#define M_PAT_MODS QR_PAT_MODS LOOP_PAT_MODS
4f4d7508 334#define S_PAT_MODS M_PAT_MODS EXEC_PAT_MODS NONDESTRUCT_PAT_MODS
bcdf7404 335
cb5027f2 336/*
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337 * NOTE: if you modify any RXf flags you should run regen.pl or
338 * regen/regcomp.pl so that regnodes.h is updated with the changes.
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339 *
340 */
bcdf7404 341
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342/* Leave some space, so future bit allocations can go either in the shared or
343 * unshared area without affecting binary compatibility */
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344#define RXf_BASE_SHIFT (_RXf_PMf_SHIFT_NEXT)
345
346/*
347 Set in Perl_pmruntime if op_flags & OPf_SPECIAL, i.e. split. Will
348 be used by regex engines to check whether they should set
349 RXf_SKIPWHITE
350*/
351#define RXf_SPLIT (1<<(RXf_BASE_SHIFT-1))
352#if RXf_SPLIT != RXf_PMf_SPLIT
353# error "RXf_SPLIT does not match RXf_PMf_SPLIT"
354#endif
f4a4cecb 355
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356/* Manually decorate this function with gcc-style attributes just to
357 * avoid having to restructure the header files and their called order,
358 * as proto.h would have to be included before this file, and isn't */
359
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360PERL_STATIC_INLINE const char *
361get_regex_charset_name(const U32 flags, STRLEN* const lenp)
362 __attribute__warn_unused_result__;
363
df7a8460 364#define MAX_CHARSET_NAME_LENGTH 2
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365
366PERL_STATIC_INLINE const char *
367get_regex_charset_name(const U32 flags, STRLEN* const lenp)
368{
369 /* Returns a string that corresponds to the name of the regex character set
370 * given by 'flags', and *lenp is set the length of that string, which
371 * cannot exceed MAX_CHARSET_NAME_LENGTH characters */
372
373 *lenp = 1;
374 switch (get_regex_charset(flags)) {
50e91148 375 case REGEX_DEPENDS_CHARSET: return DEPENDS_PAT_MODS;
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376 case REGEX_LOCALE_CHARSET: return LOCALE_PAT_MODS;
377 case REGEX_UNICODE_CHARSET: return UNICODE_PAT_MODS;
cfaf538b 378 case REGEX_ASCII_RESTRICTED_CHARSET: return ASCII_RESTRICT_PAT_MODS;
df7a8460 379 case REGEX_ASCII_MORE_RESTRICTED_CHARSET:
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380 *lenp = 2;
381 return ASCII_MORE_RESTRICT_PAT_MODS;
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382 default:
383 return "?"; /* Unknown */
a62b1201 384 }
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385}
386
52d81aa8 387/* Anchor and GPOS related stuff */
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388#define RXf_ANCH_BOL (1<<(RXf_BASE_SHIFT+0))
389#define RXf_ANCH_MBOL (1<<(RXf_BASE_SHIFT+1))
390#define RXf_ANCH_SBOL (1<<(RXf_BASE_SHIFT+2))
391#define RXf_ANCH_GPOS (1<<(RXf_BASE_SHIFT+3))
392#define RXf_GPOS_SEEN (1<<(RXf_BASE_SHIFT+4))
393#define RXf_GPOS_FLOAT (1<<(RXf_BASE_SHIFT+5))
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394/* two bits here */
395#define RXf_ANCH (RXf_ANCH_BOL|RXf_ANCH_MBOL|RXf_ANCH_GPOS|RXf_ANCH_SBOL)
396#define RXf_GPOS_CHECK (RXf_GPOS_SEEN|RXf_ANCH_GPOS)
397#define RXf_ANCH_SINGLE (RXf_ANCH_SBOL|RXf_ANCH_GPOS)
398
bbe252da 399/* What we have seen */
dbc200c5 400#define RXf_NO_INPLACE_SUBST (1<<(RXf_BASE_SHIFT+6))
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401#define RXf_EVAL_SEEN (1<<(RXf_BASE_SHIFT+7))
402#define RXf_CANY_SEEN (1<<(RXf_BASE_SHIFT+8))
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403
404/* Special */
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405#define RXf_NOSCAN (1<<(RXf_BASE_SHIFT+9))
406#define RXf_CHECK_ALL (1<<(RXf_BASE_SHIFT+10))
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407
408/* UTF8 related */
0603fe5c 409#define RXf_MATCH_UTF8 (1<<(RXf_BASE_SHIFT+11)) /* $1 etc are utf8 */
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410
411/* Intuit related */
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412#define RXf_USE_INTUIT_NOML (1<<(RXf_BASE_SHIFT+12))
413#define RXf_USE_INTUIT_ML (1<<(RXf_BASE_SHIFT+13))
414#define RXf_INTUIT_TAIL (1<<(RXf_BASE_SHIFT+14))
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415#define RXf_USE_INTUIT (RXf_USE_INTUIT_NOML|RXf_USE_INTUIT_ML)
416
417/* Copy and tainted info */
e795e964 418#define RXf_COPY_DONE (1<<(RXf_BASE_SHIFT+16))
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DM
419
420/* during execution: pattern temporarily tainted by executing locale ops;
421 * post-execution: $1 et al are tainted */
e795e964 422#define RXf_TAINTED_SEEN (1<<(RXf_BASE_SHIFT+17))
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423/* this pattern was tainted during compilation */
424#define RXf_TAINTED (1<<(RXf_BASE_SHIFT+18))
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NC
425
426/* Flags indicating special patterns */
e795e964 427#define RXf_START_ONLY (1<<(RXf_BASE_SHIFT+19)) /* Pattern is /^/ */
dbc200c5 428#define RXf_SKIPWHITE (1<<(RXf_BASE_SHIFT+20)) /* Pattern is for a split " " */
e795e964 429#define RXf_WHITE (1<<(RXf_BASE_SHIFT+21)) /* Pattern is /\s+/ */
ca835a20 430#define RXf_NULL (1U<<(RXf_BASE_SHIFT+22)) /* Pattern is // */
e795e964 431#if RXf_BASE_SHIFT+22 > 31
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432# error Too many RXf_PMf bits used. See regnodes.h for any spare in middle
433#endif
c737faaf 434
cb5027f2 435/*
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436 * NOTE: if you modify any RXf flags you should run regen.pl or
437 * regen/regcomp.pl so that regnodes.h is updated with the changes.
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438 *
439 */
bbe252da 440
284167a5
SM
441#if NO_TAINT_SUPPORT
442# define RX_ISTAINTED(prog) 0
443# define RX_TAINT_on(prog) NOOP
272d35c9
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444# define RXp_MATCH_TAINTED(prog) 0
445# define RX_MATCH_TAINTED(prog) 0
446# define RXp_MATCH_TAINTED_on(prog) NOOP
447# define RX_MATCH_TAINTED_on(prog) NOOP
448# define RX_MATCH_TAINTED_off(prog) NOOP
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449#else
450# define RX_ISTAINTED(prog) (RX_EXTFLAGS(prog) & RXf_TAINTED)
451# define RX_TAINT_on(prog) (RX_EXTFLAGS(prog) |= RXf_TAINTED)
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DM
452# define RXp_MATCH_TAINTED(prog) (RXp_EXTFLAGS(prog) & RXf_TAINTED_SEEN)
453# define RX_MATCH_TAINTED(prog) (RX_EXTFLAGS(prog) & RXf_TAINTED_SEEN)
454# define RXp_MATCH_TAINTED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_TAINTED_SEEN)
455# define RX_MATCH_TAINTED_on(prog) (RX_EXTFLAGS(prog) |= RXf_TAINTED_SEEN)
456# define RX_MATCH_TAINTED_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_TAINTED_SEEN)
284167a5
SM
457#endif
458
bbe252da 459#define RX_HAS_CUTGROUP(prog) ((prog)->intflags & PREGf_CUTGROUP_SEEN)
72311751
GS
460#define RX_MATCH_TAINTED_set(prog, t) ((t) \
461 ? RX_MATCH_TAINTED_on(prog) \
462 : RX_MATCH_TAINTED_off(prog))
c277df42 463
07bc277f
NC
464#define RXp_MATCH_COPIED(prog) (RXp_EXTFLAGS(prog) & RXf_COPY_DONE)
465#define RX_MATCH_COPIED(prog) (RX_EXTFLAGS(prog) & RXf_COPY_DONE)
466#define RXp_MATCH_COPIED_on(prog) (RXp_EXTFLAGS(prog) |= RXf_COPY_DONE)
467#define RX_MATCH_COPIED_on(prog) (RX_EXTFLAGS(prog) |= RXf_COPY_DONE)
468#define RXp_MATCH_COPIED_off(prog) (RXp_EXTFLAGS(prog) &= ~RXf_COPY_DONE)
469#define RX_MATCH_COPIED_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_COPY_DONE)
cf93c79d
IZ
470#define RX_MATCH_COPIED_set(prog,t) ((t) \
471 ? RX_MATCH_COPIED_on(prog) \
472 : RX_MATCH_COPIED_off(prog))
f9f4320a 473
07bc277f 474#define RXp_EXTFLAGS(rx) ((rx)->extflags)
dbc200c5 475#define RXp_COMPFLAGS(rx) ((rx)->compflags)
866c78d1 476
07bc277f 477/* For source compatibility. We used to store these explicitly. */
8d919b0a
FC
478#define RX_PRECOMP(prog) (RX_WRAPPED(prog) + ReANY(prog)->pre_prefix)
479#define RX_PRECOMP_const(prog) (RX_WRAPPED_const(prog) + ReANY(prog)->pre_prefix)
5509d87a
NC
480/* FIXME? Are we hardcoding too much here and constraining plugin extension
481 writers? Specifically, the value 1 assumes that the wrapped version always
482 has exactly one character at the end, a ')'. Will that always be true? */
8d919b0a
FC
483#define RX_PRELEN(prog) (RX_WRAPLEN(prog) - ReANY(prog)->pre_prefix - 1)
484#define RX_WRAPPED(prog) ReANY(prog)->xpv_len_u.xpvlenu_pv
485#define RX_WRAPPED_const(prog) ((const char *)RX_WRAPPED(prog))
9d17798d 486#define RX_WRAPLEN(prog) SvCUR(prog)
8d919b0a 487#define RX_CHECK_SUBSTR(prog) (ReANY(prog)->check_substr)
288b8c02 488#define RX_REFCNT(prog) SvREFCNT(prog)
8d919b0a 489#define RX_EXTFLAGS(prog) RXp_EXTFLAGS(ReANY(prog))
dbc200c5 490#define RX_COMPFLAGS(prog) RXp_COMPFLAGS(ReANY(prog))
8d919b0a
FC
491#define RX_ENGINE(prog) (ReANY(prog)->engine)
492#define RX_SUBBEG(prog) (ReANY(prog)->subbeg)
493#define RX_SUBOFFSET(prog) (ReANY(prog)->suboffset)
494#define RX_SUBCOFFSET(prog) (ReANY(prog)->subcoffset)
495#define RX_OFFS(prog) (ReANY(prog)->offs)
496#define RX_NPARENS(prog) (ReANY(prog)->nparens)
497#define RX_SUBLEN(prog) (ReANY(prog)->sublen)
498#define RX_MINLEN(prog) (ReANY(prog)->minlen)
499#define RX_MINLENRET(prog) (ReANY(prog)->minlenret)
500#define RX_GOFS(prog) (ReANY(prog)->gofs)
501#define RX_LASTPAREN(prog) (ReANY(prog)->lastparen)
502#define RX_LASTCLOSEPAREN(prog) (ReANY(prog)->lastcloseparen)
503#define RX_SAVED_COPY(prog) (ReANY(prog)->saved_copy)
03c83e26
DM
504/* last match was zero-length */
505#define RX_ZERO_LEN(prog) \
506 (RX_OFFS(prog)[0].start + RX_GOFS(prog) == (UV)RX_OFFS(prog)[0].end)
220fc49f 507
be8e71aa
YO
508#endif /* PLUGGABLE_RE_EXTENSION */
509
486ec47a 510/* Stuff that needs to be included in the pluggable extension goes below here */
be8e71aa 511
db2c6cb3 512#ifdef PERL_ANY_COW
ed252734 513#define RX_MATCH_COPY_FREE(rx) \
bdd9a1b1
NC
514 STMT_START {if (RX_SAVED_COPY(rx)) { \
515 SV_CHECK_THINKFIRST_COW_DROP(RX_SAVED_COPY(rx)); \
ed252734
NC
516 } \
517 if (RX_MATCH_COPIED(rx)) { \
07bc277f 518 Safefree(RX_SUBBEG(rx)); \
ed252734
NC
519 RX_MATCH_COPIED_off(rx); \
520 }} STMT_END
521#else
522#define RX_MATCH_COPY_FREE(rx) \
523 STMT_START {if (RX_MATCH_COPIED(rx)) { \
07bc277f 524 Safefree(RX_SUBBEG(rx)); \
ed252734
NC
525 RX_MATCH_COPIED_off(rx); \
526 }} STMT_END
527#endif
528
07bc277f
NC
529#define RXp_MATCH_UTF8(prog) (RXp_EXTFLAGS(prog) & RXf_MATCH_UTF8)
530#define RX_MATCH_UTF8(prog) (RX_EXTFLAGS(prog) & RXf_MATCH_UTF8)
531#define RX_MATCH_UTF8_on(prog) (RX_EXTFLAGS(prog) |= RXf_MATCH_UTF8)
532#define RX_MATCH_UTF8_off(prog) (RX_EXTFLAGS(prog) &= ~RXf_MATCH_UTF8)
a30b2f1f 533#define RX_MATCH_UTF8_set(prog, t) ((t) \
0603fe5c
DM
534 ? RX_MATCH_UTF8_on(prog) \
535 : RX_MATCH_UTF8_off(prog))
efd26800
NC
536
537/* Whether the pattern stored at RX_WRAPPED is in UTF-8 */
8f6ae13c 538#define RX_UTF8(prog) SvUTF8(prog)
7948fc08 539
cad2e5aa
JH
540#define REXEC_COPY_STR 0x01 /* Need to copy the string. */
541#define REXEC_CHECKED 0x02 /* check_substr already checked. */
542#define REXEC_SCREAM 0x04 /* use scream table. */
543#define REXEC_IGNOREPOS 0x08 /* \G matches at start. */
cf93c79d 544#define REXEC_NOT_FIRST 0x10 /* This is another iteration of //g. */
6502e081
DM
545 /* under REXEC_COPY_STR, it's ok for the
546 * engine (modulo PL_sawamperand etc)
547 * to skip copying ... */
548#define REXEC_COPY_SKIP_PRE 0x20 /* ...the $` part of the string, or */
549#define REXEC_COPY_SKIP_POST 0x40 /* ...the $' part of the string */
c277df42 550
7fe44985 551#if defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
288b8c02
NC
552# define ReREFCNT_inc(re) \
553 ({ \
554 /* This is here to generate a casting warning if incorrect. */ \
7948fc08
RU
555 REGEXP *const _rerefcnt_inc = (re); \
556 assert(SvTYPE(_rerefcnt_inc) == SVt_REGEXP); \
557 SvREFCNT_inc(_rerefcnt_inc); \
558 _rerefcnt_inc; \
288b8c02
NC
559 })
560# define ReREFCNT_dec(re) \
561 ({ \
562 /* This is here to generate a casting warning if incorrect. */ \
7948fc08
RU
563 REGEXP *const _rerefcnt_dec = (re); \
564 SvREFCNT_dec(_rerefcnt_dec); \
288b8c02
NC
565 })
566#else
567# define ReREFCNT_dec(re) SvREFCNT_dec(re)
b7e0bd9e 568# define ReREFCNT_inc(re) ((REGEXP *) SvREFCNT_inc(re))
288b8c02 569#endif
8d919b0a 570#define ReANY(re) S_ReANY((const REGEXP *)(re))
288b8c02
NC
571
572/* FIXME for plugins. */
cf93c79d
IZ
573
574#define FBMcf_TAIL_DOLLAR 1
cad2e5aa
JH
575#define FBMcf_TAIL_DOLLARM 2
576#define FBMcf_TAIL_Z 4
577#define FBMcf_TAIL_z 8
578#define FBMcf_TAIL (FBMcf_TAIL_DOLLAR|FBMcf_TAIL_DOLLARM|FBMcf_TAIL_Z|FBMcf_TAIL_z)
cf93c79d
IZ
579
580#define FBMrf_MULTILINE 1
cad2e5aa 581
331b2dcc
DM
582struct regmatch_state;
583struct regmatch_slab;
8adc0f72 584
bf2039a9
DM
585/* like regmatch_info_aux, but contains extra fields only needed if the
586 * pattern contains (?{}). If used, is snuck into the second slot in the
587 * regmatch_state stack at the start of execution */
8adc0f72
DM
588
589typedef struct {
590 regexp *rex;
591 PMOP *curpm; /* saved PL_curpm */
592#ifdef PERL_ANY_COW
593 SV *saved_copy; /* saved saved_copy field from rex */
594#endif
595 char *subbeg; /* saved subbeg field from rex */
596 STRLEN sublen; /* saved sublen field from rex */
597 STRLEN suboffset; /* saved suboffset field from rex */
598 STRLEN subcoffset; /* saved subcoffset field from rex */
599 MAGIC *pos_magic; /* pos() magic attached to $_ */
600 I32 pos; /* the original value of pos() in pos_magic */
bf2039a9
DM
601} regmatch_info_aux_eval;
602
603
604/* fields that logically live in regmatch_info, but which need cleaning
605 * up on croak(), and so are instead are snuck into the first slot in
606 * the regmatch_state stack at the start of execution */
607
608typedef struct {
609 regmatch_info_aux_eval *info_aux_eval;
331b2dcc
DM
610 struct regmatch_state *old_regmatch_state; /* saved PL_regmatch_state */
611 struct regmatch_slab *old_regmatch_slab; /* saved PL_regmatch_slab */
2ac8ff4b 612 char *poscache; /* S-L cache of fail positions of WHILEMs */
bf2039a9
DM
613} regmatch_info_aux;
614
8adc0f72 615
3b0527fe 616/* some basic information about the current match that is created by
bf2039a9
DM
617 * Perl_regexec_flags and then passed to regtry(), regmatch() etc.
618 * It is allocated as a local var on the stack, so nothing should be
619 * stored in it that needs preserving or clearing up on croak().
620 * For that, see the aux_info and aux_info_eval members of the
621 * regmatch_state union. */
3b0527fe
DM
622
623typedef struct {
28d03b21 624 REGEXP *prog; /* the regex being executed */
9d9163fb 625 const char * strbeg; /* real start of string */
28d03b21
DM
626 char *strend; /* one byte beyond last char of match string */
627 char *till; /* matches shorter than this fail (see minlen arg) */
628 SV *sv; /* the SV string currently being matched */
629 char *ganch; /* position of \G anchor */
630 char *cutpoint; /* (*COMMIT) position (if any) */
bf2039a9
DM
631 regmatch_info_aux *info_aux; /* extra fields that need cleanup */
632 regmatch_info_aux_eval *info_aux_eval; /* extra saved state for (?{}) */
1cb48e53
DM
633 I32 poscache_maxiter; /* how many whilems todo before S-L cache kicks in */
634 I32 poscache_iter; /* current countdown from _maxiter to zero */
2ac8ff4b 635 STRLEN poscache_size; /* size of regmatch_info_aux.poscache */
02d5137b 636 bool intuit; /* re_intuit_start() is the top-level caller */
ba44c216
DM
637 bool is_utf8_pat; /* regex is utf8 */
638 bool is_utf8_target; /* string being matched is utf8 */
39819bd9 639 bool warned; /* we have issued a recursion warning; no need for more */
3b0527fe
DM
640} regmatch_info;
641
5d9a96ca
DM
642
643/* structures for holding and saving the state maintained by regmatch() */
644
d56b3014 645#ifndef MAX_RECURSE_EVAL_NOCHANGE_DEPTH
4b196cd4 646#define MAX_RECURSE_EVAL_NOCHANGE_DEPTH 1000
d56b3014 647#endif
6bda09f9 648
5d9a96ca
DM
649typedef I32 CHECKPOINT;
650
a0374537 651typedef struct regmatch_state {
40a82448 652 int resume_state; /* where to jump to on return */
24d3c4a9 653 char *locinput; /* where to backtrack in string on failure */
e822a8b4
DM
654
655 union {
77cb431f 656
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DM
657 /* the 'info_aux' and 'info_aux_eval' union members are cuckoos in
658 * the nest. They aren't saved backtrack state; rather they
659 * represent one or two extra chunks of data that need allocating
660 * at the start of a match. These fields would logically live in
661 * the regmatch_info struct, except that is allocated on the
662 * C stack, and these fields are all things that require cleanup
663 * after a croak(), when the stack is lost.
664 * As a convenience, we just use the first 1 or 2 regmatch_state
665 * slots to store this info, as we will be allocating a slab of
666 * these anyway. Otherwise we'd have to malloc and then free them,
667 * or allocate them on the save stack (where they will get
668 * realloced if the save stack grows).
669 * info_aux contains the extra fields that are always needed;
670 * info_aux_eval contains extra fields that only needed if
671 * the pattern contains code blocks
672 * We split them into two separate structs to avoid increasing
673 * the size of the union.
674 */
675
676 regmatch_info_aux info_aux;
677
678 regmatch_info_aux_eval info_aux_eval;
679
77cb431f
DM
680 /* this is a fake union member that matches the first element
681 * of each member that needs to store positive backtrack
682 * information */
683 struct {
684 struct regmatch_state *prev_yes_state;
685 } yes;
686
fae667d5
YO
687 /* branchlike members */
688 /* this is a fake union member that matches the first elements
689 * of each member that needs to behave like a branch */
690 struct {
5d458dd8
YO
691 /* this first element must match u.yes */
692 struct regmatch_state *prev_yes_state;
fae667d5 693 U32 lastparen;
f6033a9d 694 U32 lastcloseparen;
fae667d5
YO
695 CHECKPOINT cp;
696
697 } branchlike;
698
699 struct {
700 /* the first elements must match u.branchlike */
701 struct regmatch_state *prev_yes_state;
702 U32 lastparen;
f6033a9d 703 U32 lastcloseparen;
fae667d5
YO
704 CHECKPOINT cp;
705
706 regnode *next_branch; /* next branch node */
707 } branch;
708
709 struct {
710 /* the first elements must match u.branchlike */
711 struct regmatch_state *prev_yes_state;
712 U32 lastparen;
f6033a9d 713 U32 lastcloseparen;
fae667d5
YO
714 CHECKPOINT cp;
715
2e64971a 716 U32 accepted; /* how many accepting states left */
6603fe3e 717 bool longfold;/* saw a fold with a 1->n char mapping */
7f69552c 718 U16 *jump; /* positive offsets from me */
7f69552c 719 regnode *me; /* Which node am I - needed for jump tries*/
2e64971a
DM
720 U8 *firstpos;/* pos in string of first trie match */
721 U32 firstchars;/* len in chars of firstpos from start */
722 U16 nextword;/* next word to try */
723 U16 topword; /* longest accepted word */
e822a8b4
DM
724 } trie;
725
fae667d5
YO
726 /* special types - these members are used to store state for special
727 regops like eval, if/then, lookaround and the markpoint state */
e822a8b4 728 struct {
77cb431f
DM
729 /* this first element must match u.yes */
730 struct regmatch_state *prev_yes_state;
faec1544
DM
731 struct regmatch_state *prev_eval;
732 struct regmatch_state *prev_curlyx;
288b8c02 733 REGEXP *prev_rex;
aa283a38
DM
734 CHECKPOINT cp; /* remember current savestack indexes */
735 CHECKPOINT lastcp;
6bda09f9 736 U32 close_paren; /* which close bracket is our end */
1b5c067c 737 regnode *B; /* the node following us */
e822a8b4
DM
738 } eval;
739
740 struct {
c476f425 741 /* this first element must match u.yes */
262b90c4 742 struct regmatch_state *prev_yes_state;
fae667d5
YO
743 I32 wanted;
744 I32 logical; /* saved copy of 'logical' var */
745 regnode *me; /* the IFMATCH/SUSPEND/UNLESSM node */
746 } ifmatch; /* and SUSPEND/UNLESSM */
747
748 struct {
749 /* this first element must match u.yes */
750 struct regmatch_state *prev_yes_state;
751 struct regmatch_state *prev_mark;
752 SV* mark_name;
753 char *mark_loc;
754 } mark;
755
756 struct {
757 int val;
758 } keeper;
759
760 /* quantifiers - these members are used for storing state for
761 for the regops used to implement quantifiers */
762 struct {
763 /* this first element must match u.yes */
764 struct regmatch_state *prev_yes_state;
c476f425 765 struct regmatch_state *prev_curlyx; /* previous cur_curlyx */
d02d6d97
DM
766 regnode *me; /* the CURLYX node */
767 regnode *B; /* the B node in /A*B/ */
c476f425
DM
768 CHECKPOINT cp; /* remember current savestack index */
769 bool minmod;
a0374537 770 int parenfloor;/* how far back to strip paren data */
c476f425
DM
771
772 /* these two are modified by WHILEM */
773 int count; /* how many instances of A we've matched */
774 char *lastloc;/* where previous A matched (0-len detect) */
e822a8b4
DM
775 } curlyx;
776
777 struct {
c476f425 778 /* this first element must match u.yes */
262b90c4 779 struct regmatch_state *prev_yes_state;
c476f425
DM
780 struct regmatch_state *save_curlyx;
781 CHECKPOINT cp; /* remember current savestack indexes */
782 CHECKPOINT lastcp;
783 char *save_lastloc; /* previous curlyx.lastloc */
784 I32 cache_offset;
785 I32 cache_mask;
e822a8b4
DM
786 } whilem;
787
788 struct {
5d458dd8
YO
789 /* this first element must match u.yes */
790 struct regmatch_state *prev_yes_state;
79a2a0e8 791 int c1, c2; /* case fold search */
40a82448 792 CHECKPOINT cp;
f6033a9d
DM
793 U32 lastparen;
794 U32 lastcloseparen;
40a82448
DM
795 I32 alen; /* length of first-matched A string */
796 I32 count;
0cadcf80 797 bool minmod;
40a82448
DM
798 regnode *A, *B; /* the nodes corresponding to /A*B/ */
799 regnode *me; /* the curlym node */
79a2a0e8
KW
800 U8 c1_utf8[UTF8_MAXBYTES+1]; /* */
801 U8 c2_utf8[UTF8_MAXBYTES+1];
e822a8b4
DM
802 } curlym;
803
804 struct {
3b6647e0 805 U32 paren;
c255a977 806 CHECKPOINT cp;
f6033a9d
DM
807 U32 lastparen;
808 U32 lastcloseparen;
79a2a0e8 809 int c1, c2; /* case fold search */
c255a977
DM
810 char *maxpos; /* highest possible point in string to match */
811 char *oldloc; /* the previous locinput */
e822a8b4 812 int count;
c255a977
DM
813 int min, max; /* {m,n} */
814 regnode *A, *B; /* the nodes corresponding to /A*B/ */
79a2a0e8
KW
815 U8 c1_utf8[UTF8_MAXBYTES+1]; /* */
816 U8 c2_utf8[UTF8_MAXBYTES+1];
c255a977 817 } curly; /* and CURLYN/PLUS/STAR */
dad79028 818
d8319b27 819 } u;
5d9a96ca
DM
820} regmatch_state;
821
822/* how many regmatch_state structs to allocate as a single slab.
823 * We do it in 4K blocks for efficiency. The "3" is 2 for the next/prev
824 * pointers, plus 1 for any mythical malloc overhead. */
825
826#define PERL_REGMATCH_SLAB_SLOTS \
827 ((4096 - 3 * sizeof (void*)) / sizeof(regmatch_state))
828
829typedef struct regmatch_slab {
830 regmatch_state states[PERL_REGMATCH_SLAB_SLOTS];
831 struct regmatch_slab *prev, *next;
832} regmatch_slab;
1ade1aa1 833
46ab3289 834
cde0cee5 835
1ade1aa1
NC
836/*
837 * Local variables:
838 * c-indentation-style: bsd
839 * c-basic-offset: 4
14d04a33 840 * indent-tabs-mode: nil
1ade1aa1
NC
841 * End:
842 *
14d04a33 843 * ex: set ts=8 sts=4 sw=4 et:
1ade1aa1 844 */