3 * Copyright (C) 1993, 1994, 1996, 1997, 1999, 2000, 2001, 2003,
4 * by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * Definitions etc. for regexp(3) routines.
14 * Caveat: this is V8 regexp(3) [actually, a reimplementation thereof],
15 * not the System V one.
17 #ifndef PLUGGABLE_RE_EXTENSION
18 /* we don't want to include this stuff if we are inside Nicholas'
19 * pluggable regex engine code */
27 typedef struct regnode regnode;
29 struct reg_substr_data;
34 typedef struct regexp_paren_ofs {
39 typedef struct regexp {
42 regexp_paren_ofs *swap;
44 struct reg_substr_data *substrs;
45 char *precomp; /* pre-compilation regular expression */
46 struct reg_data *data; /* Additional data. */
47 char *subbeg; /* saved or original string
48 so \digit works forever. */
49 #ifdef PERL_OLD_COPY_ON_WRITE
50 SV *saved_copy; /* If non-NULL, SV which is COW from original */
52 U32 *offsets; /* offset annotations 20001228 MJD */
53 I32 sublen; /* Length of string pointed by subbeg */
55 I32 minlen; /* mininum possible length of string to match */
56 I32 minlenret; /* mininum possible length of $& */
57 I32 prelen; /* length of precomp */
58 U32 nparens; /* number of parentheses */
59 U32 lastparen; /* last paren matched */
60 U32 lastcloseparen; /* last paren matched */
61 U32 reganch; /* Internal use only +
62 Tainted information used by regexec? */
63 HV *paren_names; /* Paren names */
64 const struct regexp_engine* engine;
65 regnode program[1]; /* Unwarranted chumminess with compiler. */
69 typedef struct re_scream_pos_data_s
71 char **scream_olds; /* match pos */
72 I32 *scream_pos; /* Internal iterator of scream. */
75 typedef struct regexp_engine {
76 regexp* (*comp) (pTHX_ char* exp, char* xend, PMOP* pm);
77 I32 (*exec) (pTHX_ regexp* prog, char* stringarg, char* strend,
78 char* strbeg, I32 minend, SV* screamer,
79 void* data, U32 flags);
80 char* (*intuit) (pTHX_ regexp *prog, SV *sv, char *strpos,
81 char *strend, U32 flags,
82 struct re_scream_pos_data_s *data);
83 SV* (*checkstr) (pTHX_ regexp *prog);
84 void (*free) (pTHX_ struct regexp* r);
85 char* (*as_str) (pTHX_ MAGIC *mg, STRLEN *lp, U32 *flags, I32 *haseval);
87 regexp* (*dupe) (pTHX_ const regexp *r, CLONE_PARAMS *param);
91 #define ROPT_ANCH (ROPT_ANCH_BOL|ROPT_ANCH_MBOL|ROPT_ANCH_GPOS|ROPT_ANCH_SBOL)
92 #define ROPT_ANCH_SINGLE (ROPT_ANCH_SBOL|ROPT_ANCH_GPOS)
93 #define ROPT_ANCH_BOL 0x00000001
94 #define ROPT_ANCH_MBOL 0x00000002
95 #define ROPT_ANCH_SBOL 0x00000004
96 #define ROPT_ANCH_GPOS 0x00000008
97 #define ROPT_SKIP 0x00000010
98 #define ROPT_IMPLICIT 0x00000020 /* Converted .* to ^.* */
99 #define ROPT_NOSCAN 0x00000040 /* Check-string always at start. */
100 #define ROPT_GPOS_SEEN 0x00000080
101 #define ROPT_CHECK_ALL 0x00000100
102 #define ROPT_LOOKBEHIND_SEEN 0x00000200
103 #define ROPT_EVAL_SEEN 0x00000400
104 #define ROPT_CANY_SEEN 0x00000800
105 #define ROPT_SANY_SEEN ROPT_CANY_SEEN /* src bckwrd cmpt */
106 #define ROPT_GPOS_CHECK (ROPT_GPOS_SEEN|ROPT_ANCH_GPOS)
108 /* 0xF800 of reganch is used by PMf_COMPILETIME */
110 #define ROPT_UTF8 0x00010000
111 #define ROPT_NAUGHTY 0x00020000 /* how exponential is this pattern? */
112 #define ROPT_COPY_DONE 0x00040000 /* subbeg is a copy of the string */
113 #define ROPT_TAINTED_SEEN 0x00080000
114 #define ROPT_MATCH_UTF8 0x10000000 /* subbeg is utf-8 */
115 #define ROPT_VERBARG_SEEN 0x20000000
116 #define ROPT_CUTGROUP_SEEN 0x40000000
118 #define RE_USE_INTUIT_NOML 0x00100000 /* Best to intuit before matching */
119 #define RE_USE_INTUIT_ML 0x00200000
120 #define REINT_AUTORITATIVE_NOML 0x00400000 /* Can trust a positive answer */
121 #define REINT_AUTORITATIVE_ML 0x00800000
122 #define REINT_ONCE_NOML 0x01000000 /* Intuit can succed once only. */
123 #define REINT_ONCE_ML 0x02000000
124 #define RE_INTUIT_ONECHAR 0x04000000
125 #define RE_INTUIT_TAIL 0x08000000
128 #define RE_USE_INTUIT (RE_USE_INTUIT_NOML|RE_USE_INTUIT_ML)
129 #define REINT_AUTORITATIVE (REINT_AUTORITATIVE_NOML|REINT_AUTORITATIVE_ML)
130 #define REINT_ONCE (REINT_ONCE_NOML|REINT_ONCE_ML)
132 #define RX_HAS_CUTGROUP(prog) ((prog)->reganch & ROPT_CUTGROUP_SEEN)
133 #define RX_MATCH_TAINTED(prog) ((prog)->reganch & ROPT_TAINTED_SEEN)
134 #define RX_MATCH_TAINTED_on(prog) ((prog)->reganch |= ROPT_TAINTED_SEEN)
135 #define RX_MATCH_TAINTED_off(prog) ((prog)->reganch &= ~ROPT_TAINTED_SEEN)
136 #define RX_MATCH_TAINTED_set(prog, t) ((t) \
137 ? RX_MATCH_TAINTED_on(prog) \
138 : RX_MATCH_TAINTED_off(prog))
140 #define RX_MATCH_COPIED(prog) ((prog)->reganch & ROPT_COPY_DONE)
141 #define RX_MATCH_COPIED_on(prog) ((prog)->reganch |= ROPT_COPY_DONE)
142 #define RX_MATCH_COPIED_off(prog) ((prog)->reganch &= ~ROPT_COPY_DONE)
143 #define RX_MATCH_COPIED_set(prog,t) ((t) \
144 ? RX_MATCH_COPIED_on(prog) \
145 : RX_MATCH_COPIED_off(prog))
147 #endif /* PLUGGABLE_RE_EXTENSION */
149 /* Stuff that needs to be included in the plugable extension goes below here */
151 #ifdef PERL_OLD_COPY_ON_WRITE
152 #define RX_MATCH_COPY_FREE(rx) \
153 STMT_START {if (rx->saved_copy) { \
154 SV_CHECK_THINKFIRST_COW_DROP(rx->saved_copy); \
156 if (RX_MATCH_COPIED(rx)) { \
157 Safefree(rx->subbeg); \
158 RX_MATCH_COPIED_off(rx); \
161 #define RX_MATCH_COPY_FREE(rx) \
162 STMT_START {if (RX_MATCH_COPIED(rx)) { \
163 Safefree(rx->subbeg); \
164 RX_MATCH_COPIED_off(rx); \
168 #define RX_MATCH_UTF8(prog) ((prog)->reganch & ROPT_MATCH_UTF8)
169 #define RX_MATCH_UTF8_on(prog) ((prog)->reganch |= ROPT_MATCH_UTF8)
170 #define RX_MATCH_UTF8_off(prog) ((prog)->reganch &= ~ROPT_MATCH_UTF8)
171 #define RX_MATCH_UTF8_set(prog, t) ((t) \
172 ? (RX_MATCH_UTF8_on(prog), (PL_reg_match_utf8 = 1)) \
173 : (RX_MATCH_UTF8_off(prog), (PL_reg_match_utf8 = 0)))
175 #define REXEC_COPY_STR 0x01 /* Need to copy the string. */
176 #define REXEC_CHECKED 0x02 /* check_substr already checked. */
177 #define REXEC_SCREAM 0x04 /* use scream table. */
178 #define REXEC_IGNOREPOS 0x08 /* \G matches at start. */
179 #define REXEC_NOT_FIRST 0x10 /* This is another iteration of //g. */
181 #define ReREFCNT_inc(re) ((void)(re && re->refcnt++), re)
182 #define ReREFCNT_dec(re) CALLREGFREE(re)
184 #define FBMcf_TAIL_DOLLAR 1
185 #define FBMcf_TAIL_DOLLARM 2
186 #define FBMcf_TAIL_Z 4
187 #define FBMcf_TAIL_z 8
188 #define FBMcf_TAIL (FBMcf_TAIL_DOLLAR|FBMcf_TAIL_DOLLARM|FBMcf_TAIL_Z|FBMcf_TAIL_z)
190 #define FBMrf_MULTILINE 1
192 /* an accepting state/position*/
193 struct _reg_trie_accepted {
197 typedef struct _reg_trie_accepted reg_trie_accepted;
199 /* some basic information about the current match that is created by
200 * Perl_regexec_flags and then passed to regtry(), regmatch() etc */
212 /* structures for holding and saving the state maintained by regmatch() */
214 #define MAX_RECURSE_EVAL_NOCHANGE_DEPTH 50
216 typedef I32 CHECKPOINT;
218 typedef struct regmatch_state {
219 int resume_state; /* where to jump to on return */
220 char *locinput; /* where to backtrack in string on failure */
224 /* this is a fake union member that matches the first element
225 * of each member that needs to store positive backtrack
228 struct regmatch_state *prev_yes_state;
232 /* this first element must match u.yes */
233 struct regmatch_state *prev_yes_state;
234 reg_trie_accepted *accept_buff;
235 U32 accepted; /* how many accepting states we have seen */
236 U16 *jump; /* positive offsets from me */
237 regnode *B; /* node following the trie */
238 regnode *me; /* Which node am I - needed for jump tries*/
242 /* this first element must match u.yes */
243 struct regmatch_state *prev_yes_state;
244 struct regmatch_state *prev_eval;
245 struct regmatch_state *prev_curlyx;
247 U32 toggle_reg_flags; /* what bits in PL_reg_flags to
248 flip when transitioning between
249 inner and outer rexen */
250 CHECKPOINT cp; /* remember current savestack indexes */
252 regnode *B; /* the node following us */
253 U32 close_paren; /* which close bracket is our end */
257 /* this first element must match u.yes */
258 struct regmatch_state *prev_yes_state;
259 struct regmatch_state *prev_curlyx; /* previous cur_curlyx */
260 CHECKPOINT cp; /* remember current savestack index */
262 int parenfloor;/* how far back to strip paren data */
263 int min; /* the minimal number of A's to match */
264 int max; /* the maximal number of A's to match */
265 regnode *A, *B; /* the nodes corresponding to /A*B/ */
267 /* these two are modified by WHILEM */
268 int count; /* how many instances of A we've matched */
269 char *lastloc;/* where previous A matched (0-len detect) */
273 /* this first element must match u.yes */
274 struct regmatch_state *prev_yes_state;
275 struct regmatch_state *save_curlyx;
276 CHECKPOINT cp; /* remember current savestack indexes */
278 char *save_lastloc; /* previous curlyx.lastloc */
284 /* this first element must match u.yes */
285 struct regmatch_state *prev_yes_state;
287 regnode *next_branch; /* next branch node */
292 /* this first element must match u.yes */
293 struct regmatch_state *prev_yes_state;
294 I32 c1, c2; /* case fold search */
296 I32 alen; /* length of first-matched A string */
299 regnode *A, *B; /* the nodes corresponding to /A*B/ */
300 regnode *me; /* the curlym node */
306 I32 c1, c2; /* case fold search */
307 char *maxpos; /* highest possible point in string to match */
308 char *oldloc; /* the previous locinput */
310 int min, max; /* {m,n} */
311 regnode *A, *B; /* the nodes corresponding to /A*B/ */
312 } curly; /* and CURLYN/PLUS/STAR */
315 /* this first element must match u.yes */
316 struct regmatch_state *prev_yes_state;
318 I32 logical; /* saved copy of 'logical' var */
319 regnode *me; /* the IFMATCH/SUSPEND/UNLESSM node */
320 } ifmatch; /* and SUSPEND/UNLESSM */
323 /* this first element must match u.yes */
324 struct regmatch_state *prev_yes_state;
325 struct regmatch_state *prev_mark;
332 /* how many regmatch_state structs to allocate as a single slab.
333 * We do it in 4K blocks for efficiency. The "3" is 2 for the next/prev
334 * pointers, plus 1 for any mythical malloc overhead. */
336 #define PERL_REGMATCH_SLAB_SLOTS \
337 ((4096 - 3 * sizeof (void*)) / sizeof(regmatch_state))
339 typedef struct regmatch_slab {
340 regmatch_state states[PERL_REGMATCH_SLAB_SLOTS];
341 struct regmatch_slab *prev, *next;
344 #define PL_reg_flags PL_reg_state.re_state_reg_flags
345 #define PL_bostr PL_reg_state.re_state_bostr
346 #define PL_reginput PL_reg_state.re_state_reginput
347 #define PL_regeol PL_reg_state.re_state_regeol
348 #define PL_regstartp PL_reg_state.re_state_regstartp
349 #define PL_regendp PL_reg_state.re_state_regendp
350 #define PL_reglastparen PL_reg_state.re_state_reglastparen
351 #define PL_reglastcloseparen PL_reg_state.re_state_reglastcloseparen
352 #define PL_reg_start_tmp PL_reg_state.re_state_reg_start_tmp
353 #define PL_reg_start_tmpl PL_reg_state.re_state_reg_start_tmpl
354 #define PL_reg_eval_set PL_reg_state.re_state_reg_eval_set
355 #define PL_reg_match_utf8 PL_reg_state.re_state_reg_match_utf8
356 #define PL_reg_magic PL_reg_state.re_state_reg_magic
357 #define PL_reg_oldpos PL_reg_state.re_state_reg_oldpos
358 #define PL_reg_oldcurpm PL_reg_state.re_state_reg_oldcurpm
359 #define PL_reg_curpm PL_reg_state.re_state_reg_curpm
360 #define PL_reg_oldsaved PL_reg_state.re_state_reg_oldsaved
361 #define PL_reg_oldsavedlen PL_reg_state.re_state_reg_oldsavedlen
362 #define PL_reg_maxiter PL_reg_state.re_state_reg_maxiter
363 #define PL_reg_leftiter PL_reg_state.re_state_reg_leftiter
364 #define PL_reg_poscache PL_reg_state.re_state_reg_poscache
365 #define PL_reg_poscache_size PL_reg_state.re_state_reg_poscache_size
366 #define PL_regsize PL_reg_state.re_state_regsize
367 #define PL_reg_starttry PL_reg_state.re_state_reg_starttry
368 #define PL_nrs PL_reg_state.re_state_nrs
370 struct re_save_state {
371 U32 re_state_reg_flags; /* from regexec.c */
372 char *re_state_bostr;
373 char *re_state_reginput; /* String-input pointer. */
374 char *re_state_regeol; /* End of input, for $ check. */
375 I32 *re_state_regstartp; /* Pointer to startp array. */
376 I32 *re_state_regendp; /* Ditto for endp. */
377 U32 *re_state_reglastparen; /* Similarly for lastparen. */
378 U32 *re_state_reglastcloseparen; /* Similarly for lastcloseparen. */
379 char **re_state_reg_start_tmp; /* from regexec.c */
380 U32 re_state_reg_start_tmpl; /* from regexec.c */
381 I32 re_state_reg_eval_set; /* from regexec.c */
382 bool re_state_reg_match_utf8; /* from regexec.c */
383 MAGIC *re_state_reg_magic; /* from regexec.c */
384 I32 re_state_reg_oldpos; /* from regexec.c */
385 PMOP *re_state_reg_oldcurpm; /* from regexec.c */
386 PMOP *re_state_reg_curpm; /* from regexec.c */
387 char *re_state_reg_oldsaved; /* old saved substr during match */
388 STRLEN re_state_reg_oldsavedlen; /* old length of saved substr during match */
389 I32 re_state_reg_maxiter; /* max wait until caching pos */
390 I32 re_state_reg_leftiter; /* wait until caching pos */
391 char *re_state_reg_poscache; /* cache of pos of WHILEM */
392 STRLEN re_state_reg_poscache_size; /* size of pos cache of WHILEM */
393 U32 re_state_regsize; /* from regexec.c */
394 char *re_state_reg_starttry; /* from regexec.c */
395 #ifdef PERL_OLD_COPY_ON_WRITE
396 SV *re_state_nrs; /* was placeholder: unused since 5.8.0 (5.7.2 patch #12027 for bug ID 20010815.012). Used to save rx->saved_copy */
400 #define SAVESTACK_ALLOC_FOR_RE_SAVE_STATE \
401 (1 + ((sizeof(struct re_save_state) - 1) / sizeof(*PL_savestack)))
404 * c-indentation-style: bsd
406 * indent-tabs-mode: t
409 * ex: set ts=8 sts=4 sw=4 noet: