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eb4a14ed | 1 | /* Extended regular expression matching and search library. |
af07e104 | 2 | Copyright (C) 2002-2013 Free Software Foundation, Inc. |
eb4a14ed LC |
3 | This file is part of the GNU C Library. |
4 | Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>. | |
5 | ||
af07e104 AW |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
eb4a14ed | 10 | |
af07e104 | 11 | The GNU C Library is distributed in the hope that it will be useful, |
eb4a14ed | 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
af07e104 AW |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. | |
eb4a14ed | 15 | |
af07e104 AW |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see | |
18 | <http://www.gnu.org/licenses/>. */ | |
eb4a14ed LC |
19 | |
20 | static reg_errcode_t match_ctx_init (re_match_context_t *cache, int eflags, | |
21 | Idx n) internal_function; | |
22 | static void match_ctx_clean (re_match_context_t *mctx) internal_function; | |
23 | static void match_ctx_free (re_match_context_t *cache) internal_function; | |
24 | static reg_errcode_t match_ctx_add_entry (re_match_context_t *cache, Idx node, | |
25 | Idx str_idx, Idx from, Idx to) | |
26 | internal_function; | |
27 | static Idx search_cur_bkref_entry (const re_match_context_t *mctx, Idx str_idx) | |
28 | internal_function; | |
29 | static reg_errcode_t match_ctx_add_subtop (re_match_context_t *mctx, Idx node, | |
30 | Idx str_idx) internal_function; | |
31 | static re_sub_match_last_t * match_ctx_add_sublast (re_sub_match_top_t *subtop, | |
32 | Idx node, Idx str_idx) | |
33 | internal_function; | |
34 | static void sift_ctx_init (re_sift_context_t *sctx, re_dfastate_t **sifted_sts, | |
35 | re_dfastate_t **limited_sts, Idx last_node, | |
36 | Idx last_str_idx) | |
37 | internal_function; | |
38 | static reg_errcode_t re_search_internal (const regex_t *preg, | |
39 | const char *string, Idx length, | |
40 | Idx start, Idx last_start, Idx stop, | |
41 | size_t nmatch, regmatch_t pmatch[], | |
42 | int eflags) internal_function; | |
43 | static regoff_t re_search_2_stub (struct re_pattern_buffer *bufp, | |
44 | const char *string1, Idx length1, | |
45 | const char *string2, Idx length2, | |
46 | Idx start, regoff_t range, | |
47 | struct re_registers *regs, | |
48 | Idx stop, bool ret_len) internal_function; | |
49 | static regoff_t re_search_stub (struct re_pattern_buffer *bufp, | |
50 | const char *string, Idx length, Idx start, | |
51 | regoff_t range, Idx stop, | |
52 | struct re_registers *regs, | |
53 | bool ret_len) internal_function; | |
005de2e8 LC |
54 | static unsigned re_copy_regs (struct re_registers *regs, regmatch_t *pmatch, |
55 | Idx nregs, int regs_allocated) internal_function; | |
eb4a14ed LC |
56 | static reg_errcode_t prune_impossible_nodes (re_match_context_t *mctx) |
57 | internal_function; | |
58 | static Idx check_matching (re_match_context_t *mctx, bool fl_longest_match, | |
59 | Idx *p_match_first) internal_function; | |
60 | static Idx check_halt_state_context (const re_match_context_t *mctx, | |
61 | const re_dfastate_t *state, Idx idx) | |
62 | internal_function; | |
63 | static void update_regs (const re_dfa_t *dfa, regmatch_t *pmatch, | |
64 | regmatch_t *prev_idx_match, Idx cur_node, | |
65 | Idx cur_idx, Idx nmatch) internal_function; | |
66 | static reg_errcode_t push_fail_stack (struct re_fail_stack_t *fs, | |
67 | Idx str_idx, Idx dest_node, Idx nregs, | |
68 | regmatch_t *regs, | |
69 | re_node_set *eps_via_nodes) | |
70 | internal_function; | |
71 | static reg_errcode_t set_regs (const regex_t *preg, | |
72 | const re_match_context_t *mctx, | |
73 | size_t nmatch, regmatch_t *pmatch, | |
74 | bool fl_backtrack) internal_function; | |
75 | static reg_errcode_t free_fail_stack_return (struct re_fail_stack_t *fs) | |
76 | internal_function; | |
77 | ||
78 | #ifdef RE_ENABLE_I18N | |
79 | static int sift_states_iter_mb (const re_match_context_t *mctx, | |
80 | re_sift_context_t *sctx, | |
81 | Idx node_idx, Idx str_idx, Idx max_str_idx) | |
82 | internal_function; | |
83 | #endif /* RE_ENABLE_I18N */ | |
84 | static reg_errcode_t sift_states_backward (const re_match_context_t *mctx, | |
85 | re_sift_context_t *sctx) | |
86 | internal_function; | |
87 | static reg_errcode_t build_sifted_states (const re_match_context_t *mctx, | |
88 | re_sift_context_t *sctx, Idx str_idx, | |
89 | re_node_set *cur_dest) | |
90 | internal_function; | |
91 | static reg_errcode_t update_cur_sifted_state (const re_match_context_t *mctx, | |
92 | re_sift_context_t *sctx, | |
93 | Idx str_idx, | |
94 | re_node_set *dest_nodes) | |
95 | internal_function; | |
96 | static reg_errcode_t add_epsilon_src_nodes (const re_dfa_t *dfa, | |
97 | re_node_set *dest_nodes, | |
98 | const re_node_set *candidates) | |
99 | internal_function; | |
100 | static bool check_dst_limits (const re_match_context_t *mctx, | |
101 | const re_node_set *limits, | |
102 | Idx dst_node, Idx dst_idx, Idx src_node, | |
103 | Idx src_idx) internal_function; | |
104 | static int check_dst_limits_calc_pos_1 (const re_match_context_t *mctx, | |
105 | int boundaries, Idx subexp_idx, | |
106 | Idx from_node, Idx bkref_idx) | |
107 | internal_function; | |
108 | static int check_dst_limits_calc_pos (const re_match_context_t *mctx, | |
109 | Idx limit, Idx subexp_idx, | |
110 | Idx node, Idx str_idx, | |
111 | Idx bkref_idx) internal_function; | |
112 | static reg_errcode_t check_subexp_limits (const re_dfa_t *dfa, | |
113 | re_node_set *dest_nodes, | |
114 | const re_node_set *candidates, | |
115 | re_node_set *limits, | |
116 | struct re_backref_cache_entry *bkref_ents, | |
117 | Idx str_idx) internal_function; | |
118 | static reg_errcode_t sift_states_bkref (const re_match_context_t *mctx, | |
119 | re_sift_context_t *sctx, | |
120 | Idx str_idx, const re_node_set *candidates) | |
121 | internal_function; | |
122 | static reg_errcode_t merge_state_array (const re_dfa_t *dfa, | |
123 | re_dfastate_t **dst, | |
124 | re_dfastate_t **src, Idx num) | |
125 | internal_function; | |
126 | static re_dfastate_t *find_recover_state (reg_errcode_t *err, | |
127 | re_match_context_t *mctx) internal_function; | |
128 | static re_dfastate_t *transit_state (reg_errcode_t *err, | |
129 | re_match_context_t *mctx, | |
130 | re_dfastate_t *state) internal_function; | |
131 | static re_dfastate_t *merge_state_with_log (reg_errcode_t *err, | |
132 | re_match_context_t *mctx, | |
133 | re_dfastate_t *next_state) | |
134 | internal_function; | |
135 | static reg_errcode_t check_subexp_matching_top (re_match_context_t *mctx, | |
136 | re_node_set *cur_nodes, | |
137 | Idx str_idx) internal_function; | |
138 | #if 0 | |
139 | static re_dfastate_t *transit_state_sb (reg_errcode_t *err, | |
140 | re_match_context_t *mctx, | |
141 | re_dfastate_t *pstate) | |
142 | internal_function; | |
143 | #endif | |
144 | #ifdef RE_ENABLE_I18N | |
145 | static reg_errcode_t transit_state_mb (re_match_context_t *mctx, | |
146 | re_dfastate_t *pstate) | |
147 | internal_function; | |
148 | #endif /* RE_ENABLE_I18N */ | |
149 | static reg_errcode_t transit_state_bkref (re_match_context_t *mctx, | |
150 | const re_node_set *nodes) | |
151 | internal_function; | |
152 | static reg_errcode_t get_subexp (re_match_context_t *mctx, | |
153 | Idx bkref_node, Idx bkref_str_idx) | |
154 | internal_function; | |
155 | static reg_errcode_t get_subexp_sub (re_match_context_t *mctx, | |
156 | const re_sub_match_top_t *sub_top, | |
157 | re_sub_match_last_t *sub_last, | |
158 | Idx bkref_node, Idx bkref_str) | |
159 | internal_function; | |
160 | static Idx find_subexp_node (const re_dfa_t *dfa, const re_node_set *nodes, | |
161 | Idx subexp_idx, int type) internal_function; | |
162 | static reg_errcode_t check_arrival (re_match_context_t *mctx, | |
163 | state_array_t *path, Idx top_node, | |
164 | Idx top_str, Idx last_node, Idx last_str, | |
165 | int type) internal_function; | |
166 | static reg_errcode_t check_arrival_add_next_nodes (re_match_context_t *mctx, | |
167 | Idx str_idx, | |
168 | re_node_set *cur_nodes, | |
169 | re_node_set *next_nodes) | |
170 | internal_function; | |
171 | static reg_errcode_t check_arrival_expand_ecl (const re_dfa_t *dfa, | |
172 | re_node_set *cur_nodes, | |
173 | Idx ex_subexp, int type) | |
174 | internal_function; | |
175 | static reg_errcode_t check_arrival_expand_ecl_sub (const re_dfa_t *dfa, | |
176 | re_node_set *dst_nodes, | |
177 | Idx target, Idx ex_subexp, | |
178 | int type) internal_function; | |
179 | static reg_errcode_t expand_bkref_cache (re_match_context_t *mctx, | |
180 | re_node_set *cur_nodes, Idx cur_str, | |
181 | Idx subexp_num, int type) | |
182 | internal_function; | |
183 | static bool build_trtable (const re_dfa_t *dfa, | |
184 | re_dfastate_t *state) internal_function; | |
185 | #ifdef RE_ENABLE_I18N | |
186 | static int check_node_accept_bytes (const re_dfa_t *dfa, Idx node_idx, | |
187 | const re_string_t *input, Idx idx) | |
188 | internal_function; | |
189 | # ifdef _LIBC | |
190 | static unsigned int find_collation_sequence_value (const unsigned char *mbs, | |
191 | size_t name_len) | |
192 | internal_function; | |
193 | # endif /* _LIBC */ | |
194 | #endif /* RE_ENABLE_I18N */ | |
195 | static Idx group_nodes_into_DFAstates (const re_dfa_t *dfa, | |
196 | const re_dfastate_t *state, | |
197 | re_node_set *states_node, | |
198 | bitset_t *states_ch) internal_function; | |
199 | static bool check_node_accept (const re_match_context_t *mctx, | |
200 | const re_token_t *node, Idx idx) | |
201 | internal_function; | |
af07e104 | 202 | static reg_errcode_t extend_buffers (re_match_context_t *mctx, int min_len) |
eb4a14ed LC |
203 | internal_function; |
204 | \f | |
205 | /* Entry point for POSIX code. */ | |
206 | ||
207 | /* regexec searches for a given pattern, specified by PREG, in the | |
208 | string STRING. | |
209 | ||
210 | If NMATCH is zero or REG_NOSUB was set in the cflags argument to | |
211 | 'regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at | |
212 | least NMATCH elements, and we set them to the offsets of the | |
213 | corresponding matched substrings. | |
214 | ||
215 | EFLAGS specifies "execution flags" which affect matching: if | |
216 | REG_NOTBOL is set, then ^ does not match at the beginning of the | |
217 | string; if REG_NOTEOL is set, then $ does not match at the end. | |
218 | ||
219 | We return 0 if we find a match and REG_NOMATCH if not. */ | |
220 | ||
221 | int | |
222 | regexec (preg, string, nmatch, pmatch, eflags) | |
223 | const regex_t *_Restrict_ preg; | |
224 | const char *_Restrict_ string; | |
225 | size_t nmatch; | |
226 | regmatch_t pmatch[_Restrict_arr_]; | |
227 | int eflags; | |
228 | { | |
229 | reg_errcode_t err; | |
230 | Idx start, length; | |
231 | #ifdef _LIBC | |
005de2e8 | 232 | re_dfa_t *dfa = preg->buffer; |
eb4a14ed LC |
233 | #endif |
234 | ||
235 | if (eflags & ~(REG_NOTBOL | REG_NOTEOL | REG_STARTEND)) | |
236 | return REG_BADPAT; | |
237 | ||
238 | if (eflags & REG_STARTEND) | |
239 | { | |
240 | start = pmatch[0].rm_so; | |
241 | length = pmatch[0].rm_eo; | |
242 | } | |
243 | else | |
244 | { | |
245 | start = 0; | |
246 | length = strlen (string); | |
247 | } | |
248 | ||
249 | __libc_lock_lock (dfa->lock); | |
250 | if (preg->no_sub) | |
251 | err = re_search_internal (preg, string, length, start, length, | |
252 | length, 0, NULL, eflags); | |
253 | else | |
254 | err = re_search_internal (preg, string, length, start, length, | |
255 | length, nmatch, pmatch, eflags); | |
256 | __libc_lock_unlock (dfa->lock); | |
257 | return err != REG_NOERROR; | |
258 | } | |
259 | ||
260 | #ifdef _LIBC | |
261 | # include <shlib-compat.h> | |
262 | versioned_symbol (libc, __regexec, regexec, GLIBC_2_3_4); | |
263 | ||
264 | # if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3_4) | |
265 | __typeof__ (__regexec) __compat_regexec; | |
266 | ||
267 | int | |
268 | attribute_compat_text_section | |
269 | __compat_regexec (const regex_t *_Restrict_ preg, | |
270 | const char *_Restrict_ string, size_t nmatch, | |
271 | regmatch_t pmatch[], int eflags) | |
272 | { | |
273 | return regexec (preg, string, nmatch, pmatch, | |
274 | eflags & (REG_NOTBOL | REG_NOTEOL)); | |
275 | } | |
276 | compat_symbol (libc, __compat_regexec, regexec, GLIBC_2_0); | |
277 | # endif | |
278 | #endif | |
279 | ||
280 | /* Entry points for GNU code. */ | |
281 | ||
282 | /* re_match, re_search, re_match_2, re_search_2 | |
283 | ||
284 | The former two functions operate on STRING with length LENGTH, | |
285 | while the later two operate on concatenation of STRING1 and STRING2 | |
286 | with lengths LENGTH1 and LENGTH2, respectively. | |
287 | ||
288 | re_match() matches the compiled pattern in BUFP against the string, | |
289 | starting at index START. | |
290 | ||
291 | re_search() first tries matching at index START, then it tries to match | |
292 | starting from index START + 1, and so on. The last start position tried | |
293 | is START + RANGE. (Thus RANGE = 0 forces re_search to operate the same | |
294 | way as re_match().) | |
295 | ||
296 | The parameter STOP of re_{match,search}_2 specifies that no match exceeding | |
297 | the first STOP characters of the concatenation of the strings should be | |
298 | concerned. | |
299 | ||
300 | If REGS is not NULL, and BUFP->no_sub is not set, the offsets of the match | |
301 | and all groups is stored in REGS. (For the "_2" variants, the offsets are | |
302 | computed relative to the concatenation, not relative to the individual | |
303 | strings.) | |
304 | ||
305 | On success, re_match* functions return the length of the match, re_search* | |
306 | return the position of the start of the match. Return value -1 means no | |
307 | match was found and -2 indicates an internal error. */ | |
308 | ||
309 | regoff_t | |
310 | re_match (bufp, string, length, start, regs) | |
311 | struct re_pattern_buffer *bufp; | |
312 | const char *string; | |
313 | Idx length, start; | |
314 | struct re_registers *regs; | |
315 | { | |
316 | return re_search_stub (bufp, string, length, start, 0, length, regs, true); | |
317 | } | |
318 | #ifdef _LIBC | |
319 | weak_alias (__re_match, re_match) | |
320 | #endif | |
321 | ||
322 | regoff_t | |
323 | re_search (bufp, string, length, start, range, regs) | |
324 | struct re_pattern_buffer *bufp; | |
325 | const char *string; | |
326 | Idx length, start; | |
327 | regoff_t range; | |
328 | struct re_registers *regs; | |
329 | { | |
330 | return re_search_stub (bufp, string, length, start, range, length, regs, | |
331 | false); | |
332 | } | |
333 | #ifdef _LIBC | |
334 | weak_alias (__re_search, re_search) | |
335 | #endif | |
336 | ||
337 | regoff_t | |
338 | re_match_2 (bufp, string1, length1, string2, length2, start, regs, stop) | |
339 | struct re_pattern_buffer *bufp; | |
340 | const char *string1, *string2; | |
341 | Idx length1, length2, start, stop; | |
342 | struct re_registers *regs; | |
343 | { | |
344 | return re_search_2_stub (bufp, string1, length1, string2, length2, | |
345 | start, 0, regs, stop, true); | |
346 | } | |
347 | #ifdef _LIBC | |
348 | weak_alias (__re_match_2, re_match_2) | |
349 | #endif | |
350 | ||
351 | regoff_t | |
352 | re_search_2 (bufp, string1, length1, string2, length2, start, range, regs, stop) | |
353 | struct re_pattern_buffer *bufp; | |
354 | const char *string1, *string2; | |
355 | Idx length1, length2, start, stop; | |
356 | regoff_t range; | |
357 | struct re_registers *regs; | |
358 | { | |
359 | return re_search_2_stub (bufp, string1, length1, string2, length2, | |
360 | start, range, regs, stop, false); | |
361 | } | |
362 | #ifdef _LIBC | |
363 | weak_alias (__re_search_2, re_search_2) | |
364 | #endif | |
365 | ||
366 | static regoff_t | |
eb4a14ed LC |
367 | re_search_2_stub (struct re_pattern_buffer *bufp, |
368 | const char *string1, Idx length1, | |
369 | const char *string2, Idx length2, | |
370 | Idx start, regoff_t range, struct re_registers *regs, | |
371 | Idx stop, bool ret_len) | |
372 | { | |
373 | const char *str; | |
374 | regoff_t rval; | |
375 | Idx len = length1 + length2; | |
376 | char *s = NULL; | |
377 | ||
378 | if (BE (length1 < 0 || length2 < 0 || stop < 0 || len < length1, 0)) | |
379 | return -2; | |
380 | ||
381 | /* Concatenate the strings. */ | |
382 | if (length2 > 0) | |
383 | if (length1 > 0) | |
384 | { | |
385 | s = re_malloc (char, len); | |
386 | ||
387 | if (BE (s == NULL, 0)) | |
388 | return -2; | |
389 | #ifdef _LIBC | |
390 | memcpy (__mempcpy (s, string1, length1), string2, length2); | |
391 | #else | |
392 | memcpy (s, string1, length1); | |
393 | memcpy (s + length1, string2, length2); | |
394 | #endif | |
395 | str = s; | |
396 | } | |
397 | else | |
398 | str = string2; | |
399 | else | |
400 | str = string1; | |
401 | ||
402 | rval = re_search_stub (bufp, str, len, start, range, stop, regs, | |
403 | ret_len); | |
404 | re_free (s); | |
405 | return rval; | |
406 | } | |
407 | ||
408 | /* The parameters have the same meaning as those of re_search. | |
409 | Additional parameters: | |
410 | If RET_LEN is true the length of the match is returned (re_match style); | |
411 | otherwise the position of the match is returned. */ | |
412 | ||
413 | static regoff_t | |
eb4a14ed LC |
414 | re_search_stub (struct re_pattern_buffer *bufp, |
415 | const char *string, Idx length, | |
416 | Idx start, regoff_t range, Idx stop, struct re_registers *regs, | |
417 | bool ret_len) | |
418 | { | |
419 | reg_errcode_t result; | |
420 | regmatch_t *pmatch; | |
421 | Idx nregs; | |
422 | regoff_t rval; | |
423 | int eflags = 0; | |
424 | #ifdef _LIBC | |
005de2e8 | 425 | re_dfa_t *dfa = bufp->buffer; |
eb4a14ed LC |
426 | #endif |
427 | Idx last_start = start + range; | |
428 | ||
429 | /* Check for out-of-range. */ | |
430 | if (BE (start < 0 || start > length, 0)) | |
431 | return -1; | |
432 | if (BE (length < last_start || (0 <= range && last_start < start), 0)) | |
433 | last_start = length; | |
434 | else if (BE (last_start < 0 || (range < 0 && start <= last_start), 0)) | |
435 | last_start = 0; | |
436 | ||
437 | __libc_lock_lock (dfa->lock); | |
438 | ||
439 | eflags |= (bufp->not_bol) ? REG_NOTBOL : 0; | |
440 | eflags |= (bufp->not_eol) ? REG_NOTEOL : 0; | |
441 | ||
442 | /* Compile fastmap if we haven't yet. */ | |
443 | if (start < last_start && bufp->fastmap != NULL && !bufp->fastmap_accurate) | |
444 | re_compile_fastmap (bufp); | |
445 | ||
446 | if (BE (bufp->no_sub, 0)) | |
447 | regs = NULL; | |
448 | ||
449 | /* We need at least 1 register. */ | |
450 | if (regs == NULL) | |
451 | nregs = 1; | |
452 | else if (BE (bufp->regs_allocated == REGS_FIXED | |
453 | && regs->num_regs <= bufp->re_nsub, 0)) | |
454 | { | |
455 | nregs = regs->num_regs; | |
456 | if (BE (nregs < 1, 0)) | |
457 | { | |
458 | /* Nothing can be copied to regs. */ | |
459 | regs = NULL; | |
460 | nregs = 1; | |
461 | } | |
462 | } | |
463 | else | |
464 | nregs = bufp->re_nsub + 1; | |
465 | pmatch = re_malloc (regmatch_t, nregs); | |
466 | if (BE (pmatch == NULL, 0)) | |
467 | { | |
468 | rval = -2; | |
469 | goto out; | |
470 | } | |
471 | ||
472 | result = re_search_internal (bufp, string, length, start, last_start, stop, | |
473 | nregs, pmatch, eflags); | |
474 | ||
475 | rval = 0; | |
476 | ||
005de2e8 | 477 | /* I hope we needn't fill their regs with -1's when no match was found. */ |
eb4a14ed | 478 | if (result != REG_NOERROR) |
005de2e8 | 479 | rval = result == REG_NOMATCH ? -1 : -2; |
eb4a14ed LC |
480 | else if (regs != NULL) |
481 | { | |
482 | /* If caller wants register contents data back, copy them. */ | |
483 | bufp->regs_allocated = re_copy_regs (regs, pmatch, nregs, | |
484 | bufp->regs_allocated); | |
485 | if (BE (bufp->regs_allocated == REGS_UNALLOCATED, 0)) | |
486 | rval = -2; | |
487 | } | |
488 | ||
489 | if (BE (rval == 0, 1)) | |
490 | { | |
491 | if (ret_len) | |
492 | { | |
493 | assert (pmatch[0].rm_so == start); | |
494 | rval = pmatch[0].rm_eo - start; | |
495 | } | |
496 | else | |
497 | rval = pmatch[0].rm_so; | |
498 | } | |
499 | re_free (pmatch); | |
500 | out: | |
501 | __libc_lock_unlock (dfa->lock); | |
502 | return rval; | |
503 | } | |
504 | ||
005de2e8 | 505 | static unsigned |
eb4a14ed LC |
506 | re_copy_regs (struct re_registers *regs, regmatch_t *pmatch, Idx nregs, |
507 | int regs_allocated) | |
508 | { | |
509 | int rval = REGS_REALLOCATE; | |
510 | Idx i; | |
511 | Idx need_regs = nregs + 1; | |
512 | /* We need one extra element beyond 'num_regs' for the '-1' marker GNU code | |
513 | uses. */ | |
514 | ||
515 | /* Have the register data arrays been allocated? */ | |
516 | if (regs_allocated == REGS_UNALLOCATED) | |
517 | { /* No. So allocate them with malloc. */ | |
518 | regs->start = re_malloc (regoff_t, need_regs); | |
519 | if (BE (regs->start == NULL, 0)) | |
520 | return REGS_UNALLOCATED; | |
521 | regs->end = re_malloc (regoff_t, need_regs); | |
522 | if (BE (regs->end == NULL, 0)) | |
523 | { | |
524 | re_free (regs->start); | |
525 | return REGS_UNALLOCATED; | |
526 | } | |
527 | regs->num_regs = need_regs; | |
528 | } | |
529 | else if (regs_allocated == REGS_REALLOCATE) | |
530 | { /* Yes. If we need more elements than were already | |
531 | allocated, reallocate them. If we need fewer, just | |
532 | leave it alone. */ | |
533 | if (BE (need_regs > regs->num_regs, 0)) | |
534 | { | |
535 | regoff_t *new_start = re_realloc (regs->start, regoff_t, need_regs); | |
536 | regoff_t *new_end; | |
537 | if (BE (new_start == NULL, 0)) | |
538 | return REGS_UNALLOCATED; | |
539 | new_end = re_realloc (regs->end, regoff_t, need_regs); | |
540 | if (BE (new_end == NULL, 0)) | |
541 | { | |
542 | re_free (new_start); | |
543 | return REGS_UNALLOCATED; | |
544 | } | |
545 | regs->start = new_start; | |
546 | regs->end = new_end; | |
547 | regs->num_regs = need_regs; | |
548 | } | |
549 | } | |
550 | else | |
551 | { | |
552 | assert (regs_allocated == REGS_FIXED); | |
553 | /* This function may not be called with REGS_FIXED and nregs too big. */ | |
554 | assert (regs->num_regs >= nregs); | |
555 | rval = REGS_FIXED; | |
556 | } | |
557 | ||
558 | /* Copy the regs. */ | |
559 | for (i = 0; i < nregs; ++i) | |
560 | { | |
561 | regs->start[i] = pmatch[i].rm_so; | |
562 | regs->end[i] = pmatch[i].rm_eo; | |
563 | } | |
564 | for ( ; i < regs->num_regs; ++i) | |
565 | regs->start[i] = regs->end[i] = -1; | |
566 | ||
567 | return rval; | |
568 | } | |
569 | ||
570 | /* Set REGS to hold NUM_REGS registers, storing them in STARTS and | |
571 | ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use | |
572 | this memory for recording register information. STARTS and ENDS | |
573 | must be allocated using the malloc library routine, and must each | |
574 | be at least NUM_REGS * sizeof (regoff_t) bytes long. | |
575 | ||
576 | If NUM_REGS == 0, then subsequent matches should allocate their own | |
577 | register data. | |
578 | ||
579 | Unless this function is called, the first search or match using | |
580 | PATTERN_BUFFER will allocate its own register data, without | |
581 | freeing the old data. */ | |
582 | ||
583 | void | |
584 | re_set_registers (bufp, regs, num_regs, starts, ends) | |
585 | struct re_pattern_buffer *bufp; | |
586 | struct re_registers *regs; | |
587 | __re_size_t num_regs; | |
588 | regoff_t *starts, *ends; | |
589 | { | |
590 | if (num_regs) | |
591 | { | |
592 | bufp->regs_allocated = REGS_REALLOCATE; | |
593 | regs->num_regs = num_regs; | |
594 | regs->start = starts; | |
595 | regs->end = ends; | |
596 | } | |
597 | else | |
598 | { | |
599 | bufp->regs_allocated = REGS_UNALLOCATED; | |
600 | regs->num_regs = 0; | |
601 | regs->start = regs->end = NULL; | |
602 | } | |
603 | } | |
604 | #ifdef _LIBC | |
605 | weak_alias (__re_set_registers, re_set_registers) | |
606 | #endif | |
607 | \f | |
608 | /* Entry points compatible with 4.2 BSD regex library. We don't define | |
609 | them unless specifically requested. */ | |
610 | ||
611 | #if defined _REGEX_RE_COMP || defined _LIBC | |
612 | int | |
613 | # ifdef _LIBC | |
614 | weak_function | |
615 | # endif | |
616 | re_exec (s) | |
617 | const char *s; | |
618 | { | |
619 | return 0 == regexec (&re_comp_buf, s, 0, NULL, 0); | |
620 | } | |
621 | #endif /* _REGEX_RE_COMP */ | |
622 | \f | |
623 | /* Internal entry point. */ | |
624 | ||
625 | /* Searches for a compiled pattern PREG in the string STRING, whose | |
626 | length is LENGTH. NMATCH, PMATCH, and EFLAGS have the same | |
627 | meaning as with regexec. LAST_START is START + RANGE, where | |
628 | START and RANGE have the same meaning as with re_search. | |
629 | Return REG_NOERROR if we find a match, and REG_NOMATCH if not, | |
630 | otherwise return the error code. | |
631 | Note: We assume front end functions already check ranges. | |
632 | (0 <= LAST_START && LAST_START <= LENGTH) */ | |
633 | ||
634 | static reg_errcode_t | |
005de2e8 | 635 | __attribute_warn_unused_result__ |
eb4a14ed LC |
636 | re_search_internal (const regex_t *preg, |
637 | const char *string, Idx length, | |
638 | Idx start, Idx last_start, Idx stop, | |
639 | size_t nmatch, regmatch_t pmatch[], | |
640 | int eflags) | |
641 | { | |
642 | reg_errcode_t err; | |
005de2e8 | 643 | const re_dfa_t *dfa = preg->buffer; |
eb4a14ed LC |
644 | Idx left_lim, right_lim; |
645 | int incr; | |
646 | bool fl_longest_match; | |
647 | int match_kind; | |
648 | Idx match_first; | |
649 | Idx match_last = REG_MISSING; | |
650 | Idx extra_nmatch; | |
651 | bool sb; | |
652 | int ch; | |
653 | #if defined _LIBC || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L) | |
654 | re_match_context_t mctx = { .dfa = dfa }; | |
655 | #else | |
656 | re_match_context_t mctx; | |
657 | #endif | |
658 | char *fastmap = ((preg->fastmap != NULL && preg->fastmap_accurate | |
659 | && start != last_start && !preg->can_be_null) | |
660 | ? preg->fastmap : NULL); | |
661 | RE_TRANSLATE_TYPE t = preg->translate; | |
662 | ||
663 | #if !(defined _LIBC || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) | |
664 | memset (&mctx, '\0', sizeof (re_match_context_t)); | |
665 | mctx.dfa = dfa; | |
666 | #endif | |
667 | ||
668 | extra_nmatch = (nmatch > preg->re_nsub) ? nmatch - (preg->re_nsub + 1) : 0; | |
669 | nmatch -= extra_nmatch; | |
670 | ||
671 | /* Check if the DFA haven't been compiled. */ | |
672 | if (BE (preg->used == 0 || dfa->init_state == NULL | |
673 | || dfa->init_state_word == NULL || dfa->init_state_nl == NULL | |
674 | || dfa->init_state_begbuf == NULL, 0)) | |
675 | return REG_NOMATCH; | |
676 | ||
677 | #ifdef DEBUG | |
678 | /* We assume front-end functions already check them. */ | |
679 | assert (0 <= last_start && last_start <= length); | |
680 | #endif | |
681 | ||
682 | /* If initial states with non-begbuf contexts have no elements, | |
683 | the regex must be anchored. If preg->newline_anchor is set, | |
684 | we'll never use init_state_nl, so do not check it. */ | |
685 | if (dfa->init_state->nodes.nelem == 0 | |
686 | && dfa->init_state_word->nodes.nelem == 0 | |
687 | && (dfa->init_state_nl->nodes.nelem == 0 | |
688 | || !preg->newline_anchor)) | |
689 | { | |
690 | if (start != 0 && last_start != 0) | |
691 | return REG_NOMATCH; | |
692 | start = last_start = 0; | |
693 | } | |
694 | ||
695 | /* We must check the longest matching, if nmatch > 0. */ | |
696 | fl_longest_match = (nmatch != 0 || dfa->nbackref); | |
697 | ||
698 | err = re_string_allocate (&mctx.input, string, length, dfa->nodes_len + 1, | |
699 | preg->translate, (preg->syntax & RE_ICASE) != 0, | |
700 | dfa); | |
701 | if (BE (err != REG_NOERROR, 0)) | |
702 | goto free_return; | |
703 | mctx.input.stop = stop; | |
704 | mctx.input.raw_stop = stop; | |
705 | mctx.input.newline_anchor = preg->newline_anchor; | |
706 | ||
707 | err = match_ctx_init (&mctx, eflags, dfa->nbackref * 2); | |
708 | if (BE (err != REG_NOERROR, 0)) | |
709 | goto free_return; | |
710 | ||
711 | /* We will log all the DFA states through which the dfa pass, | |
712 | if nmatch > 1, or this dfa has "multibyte node", which is a | |
713 | back-reference or a node which can accept multibyte character or | |
714 | multi character collating element. */ | |
715 | if (nmatch > 1 || dfa->has_mb_node) | |
716 | { | |
717 | /* Avoid overflow. */ | |
005de2e8 LC |
718 | if (BE ((MIN (IDX_MAX, SIZE_MAX / sizeof (re_dfastate_t *)) |
719 | <= mctx.input.bufs_len), 0)) | |
eb4a14ed LC |
720 | { |
721 | err = REG_ESPACE; | |
722 | goto free_return; | |
723 | } | |
724 | ||
725 | mctx.state_log = re_malloc (re_dfastate_t *, mctx.input.bufs_len + 1); | |
726 | if (BE (mctx.state_log == NULL, 0)) | |
727 | { | |
728 | err = REG_ESPACE; | |
729 | goto free_return; | |
730 | } | |
731 | } | |
732 | else | |
733 | mctx.state_log = NULL; | |
734 | ||
735 | match_first = start; | |
736 | mctx.input.tip_context = (eflags & REG_NOTBOL) ? CONTEXT_BEGBUF | |
737 | : CONTEXT_NEWLINE | CONTEXT_BEGBUF; | |
738 | ||
7ae4e75a | 739 | /* Check incrementally whether the input string matches. */ |
eb4a14ed LC |
740 | incr = (last_start < start) ? -1 : 1; |
741 | left_lim = (last_start < start) ? last_start : start; | |
742 | right_lim = (last_start < start) ? start : last_start; | |
743 | sb = dfa->mb_cur_max == 1; | |
744 | match_kind = | |
745 | (fastmap | |
746 | ? ((sb || !(preg->syntax & RE_ICASE || t) ? 4 : 0) | |
747 | | (start <= last_start ? 2 : 0) | |
748 | | (t != NULL ? 1 : 0)) | |
749 | : 8); | |
750 | ||
751 | for (;; match_first += incr) | |
752 | { | |
753 | err = REG_NOMATCH; | |
754 | if (match_first < left_lim || right_lim < match_first) | |
755 | goto free_return; | |
756 | ||
757 | /* Advance as rapidly as possible through the string, until we | |
758 | find a plausible place to start matching. This may be done | |
759 | with varying efficiency, so there are various possibilities: | |
760 | only the most common of them are specialized, in order to | |
761 | save on code size. We use a switch statement for speed. */ | |
762 | switch (match_kind) | |
763 | { | |
764 | case 8: | |
765 | /* No fastmap. */ | |
766 | break; | |
767 | ||
768 | case 7: | |
769 | /* Fastmap with single-byte translation, match forward. */ | |
770 | while (BE (match_first < right_lim, 1) | |
771 | && !fastmap[t[(unsigned char) string[match_first]]]) | |
772 | ++match_first; | |
773 | goto forward_match_found_start_or_reached_end; | |
774 | ||
775 | case 6: | |
776 | /* Fastmap without translation, match forward. */ | |
777 | while (BE (match_first < right_lim, 1) | |
778 | && !fastmap[(unsigned char) string[match_first]]) | |
779 | ++match_first; | |
780 | ||
781 | forward_match_found_start_or_reached_end: | |
782 | if (BE (match_first == right_lim, 0)) | |
783 | { | |
784 | ch = match_first >= length | |
785 | ? 0 : (unsigned char) string[match_first]; | |
786 | if (!fastmap[t ? t[ch] : ch]) | |
787 | goto free_return; | |
788 | } | |
789 | break; | |
790 | ||
791 | case 4: | |
792 | case 5: | |
793 | /* Fastmap without multi-byte translation, match backwards. */ | |
794 | while (match_first >= left_lim) | |
795 | { | |
796 | ch = match_first >= length | |
797 | ? 0 : (unsigned char) string[match_first]; | |
798 | if (fastmap[t ? t[ch] : ch]) | |
799 | break; | |
800 | --match_first; | |
801 | } | |
802 | if (match_first < left_lim) | |
803 | goto free_return; | |
804 | break; | |
805 | ||
806 | default: | |
807 | /* In this case, we can't determine easily the current byte, | |
808 | since it might be a component byte of a multibyte | |
809 | character. Then we use the constructed buffer instead. */ | |
810 | for (;;) | |
811 | { | |
812 | /* If MATCH_FIRST is out of the valid range, reconstruct the | |
813 | buffers. */ | |
814 | __re_size_t offset = match_first - mctx.input.raw_mbs_idx; | |
815 | if (BE (offset >= (__re_size_t) mctx.input.valid_raw_len, 0)) | |
816 | { | |
817 | err = re_string_reconstruct (&mctx.input, match_first, | |
818 | eflags); | |
819 | if (BE (err != REG_NOERROR, 0)) | |
820 | goto free_return; | |
821 | ||
822 | offset = match_first - mctx.input.raw_mbs_idx; | |
823 | } | |
824 | /* If MATCH_FIRST is out of the buffer, leave it as '\0'. | |
825 | Note that MATCH_FIRST must not be smaller than 0. */ | |
826 | ch = (match_first >= length | |
827 | ? 0 : re_string_byte_at (&mctx.input, offset)); | |
828 | if (fastmap[ch]) | |
829 | break; | |
830 | match_first += incr; | |
831 | if (match_first < left_lim || match_first > right_lim) | |
832 | { | |
833 | err = REG_NOMATCH; | |
834 | goto free_return; | |
835 | } | |
836 | } | |
837 | break; | |
838 | } | |
839 | ||
840 | /* Reconstruct the buffers so that the matcher can assume that | |
841 | the matching starts from the beginning of the buffer. */ | |
842 | err = re_string_reconstruct (&mctx.input, match_first, eflags); | |
843 | if (BE (err != REG_NOERROR, 0)) | |
844 | goto free_return; | |
845 | ||
846 | #ifdef RE_ENABLE_I18N | |
847 | /* Don't consider this char as a possible match start if it part, | |
848 | yet isn't the head, of a multibyte character. */ | |
849 | if (!sb && !re_string_first_byte (&mctx.input, 0)) | |
850 | continue; | |
851 | #endif | |
852 | ||
853 | /* It seems to be appropriate one, then use the matcher. */ | |
854 | /* We assume that the matching starts from 0. */ | |
855 | mctx.state_log_top = mctx.nbkref_ents = mctx.max_mb_elem_len = 0; | |
856 | match_last = check_matching (&mctx, fl_longest_match, | |
857 | start <= last_start ? &match_first : NULL); | |
858 | if (match_last != REG_MISSING) | |
859 | { | |
860 | if (BE (match_last == REG_ERROR, 0)) | |
861 | { | |
862 | err = REG_ESPACE; | |
863 | goto free_return; | |
864 | } | |
865 | else | |
866 | { | |
867 | mctx.match_last = match_last; | |
868 | if ((!preg->no_sub && nmatch > 1) || dfa->nbackref) | |
869 | { | |
870 | re_dfastate_t *pstate = mctx.state_log[match_last]; | |
871 | mctx.last_node = check_halt_state_context (&mctx, pstate, | |
872 | match_last); | |
873 | } | |
874 | if ((!preg->no_sub && nmatch > 1 && dfa->has_plural_match) | |
875 | || dfa->nbackref) | |
876 | { | |
877 | err = prune_impossible_nodes (&mctx); | |
878 | if (err == REG_NOERROR) | |
879 | break; | |
880 | if (BE (err != REG_NOMATCH, 0)) | |
881 | goto free_return; | |
882 | match_last = REG_MISSING; | |
883 | } | |
884 | else | |
885 | break; /* We found a match. */ | |
886 | } | |
887 | } | |
888 | ||
889 | match_ctx_clean (&mctx); | |
890 | } | |
891 | ||
892 | #ifdef DEBUG | |
893 | assert (match_last != REG_MISSING); | |
894 | assert (err == REG_NOERROR); | |
895 | #endif | |
896 | ||
897 | /* Set pmatch[] if we need. */ | |
898 | if (nmatch > 0) | |
899 | { | |
900 | Idx reg_idx; | |
901 | ||
902 | /* Initialize registers. */ | |
903 | for (reg_idx = 1; reg_idx < nmatch; ++reg_idx) | |
904 | pmatch[reg_idx].rm_so = pmatch[reg_idx].rm_eo = -1; | |
905 | ||
906 | /* Set the points where matching start/end. */ | |
907 | pmatch[0].rm_so = 0; | |
908 | pmatch[0].rm_eo = mctx.match_last; | |
909 | /* FIXME: This function should fail if mctx.match_last exceeds | |
910 | the maximum possible regoff_t value. We need a new error | |
911 | code REG_OVERFLOW. */ | |
912 | ||
913 | if (!preg->no_sub && nmatch > 1) | |
914 | { | |
915 | err = set_regs (preg, &mctx, nmatch, pmatch, | |
916 | dfa->has_plural_match && dfa->nbackref > 0); | |
917 | if (BE (err != REG_NOERROR, 0)) | |
918 | goto free_return; | |
919 | } | |
920 | ||
005de2e8 | 921 | /* At last, add the offset to each register, since we slid |
eb4a14ed LC |
922 | the buffers so that we could assume that the matching starts |
923 | from 0. */ | |
924 | for (reg_idx = 0; reg_idx < nmatch; ++reg_idx) | |
925 | if (pmatch[reg_idx].rm_so != -1) | |
926 | { | |
927 | #ifdef RE_ENABLE_I18N | |
928 | if (BE (mctx.input.offsets_needed != 0, 0)) | |
929 | { | |
930 | pmatch[reg_idx].rm_so = | |
931 | (pmatch[reg_idx].rm_so == mctx.input.valid_len | |
932 | ? mctx.input.valid_raw_len | |
933 | : mctx.input.offsets[pmatch[reg_idx].rm_so]); | |
934 | pmatch[reg_idx].rm_eo = | |
935 | (pmatch[reg_idx].rm_eo == mctx.input.valid_len | |
936 | ? mctx.input.valid_raw_len | |
937 | : mctx.input.offsets[pmatch[reg_idx].rm_eo]); | |
938 | } | |
939 | #else | |
940 | assert (mctx.input.offsets_needed == 0); | |
941 | #endif | |
942 | pmatch[reg_idx].rm_so += match_first; | |
943 | pmatch[reg_idx].rm_eo += match_first; | |
944 | } | |
945 | for (reg_idx = 0; reg_idx < extra_nmatch; ++reg_idx) | |
946 | { | |
947 | pmatch[nmatch + reg_idx].rm_so = -1; | |
948 | pmatch[nmatch + reg_idx].rm_eo = -1; | |
949 | } | |
950 | ||
951 | if (dfa->subexp_map) | |
952 | for (reg_idx = 0; reg_idx + 1 < nmatch; reg_idx++) | |
953 | if (dfa->subexp_map[reg_idx] != reg_idx) | |
954 | { | |
955 | pmatch[reg_idx + 1].rm_so | |
956 | = pmatch[dfa->subexp_map[reg_idx] + 1].rm_so; | |
957 | pmatch[reg_idx + 1].rm_eo | |
958 | = pmatch[dfa->subexp_map[reg_idx] + 1].rm_eo; | |
959 | } | |
960 | } | |
961 | ||
962 | free_return: | |
963 | re_free (mctx.state_log); | |
964 | if (dfa->nbackref) | |
965 | match_ctx_free (&mctx); | |
966 | re_string_destruct (&mctx.input); | |
967 | return err; | |
968 | } | |
969 | ||
970 | static reg_errcode_t | |
005de2e8 | 971 | __attribute_warn_unused_result__ |
eb4a14ed LC |
972 | prune_impossible_nodes (re_match_context_t *mctx) |
973 | { | |
974 | const re_dfa_t *const dfa = mctx->dfa; | |
975 | Idx halt_node, match_last; | |
976 | reg_errcode_t ret; | |
977 | re_dfastate_t **sifted_states; | |
978 | re_dfastate_t **lim_states = NULL; | |
979 | re_sift_context_t sctx; | |
980 | #ifdef DEBUG | |
981 | assert (mctx->state_log != NULL); | |
982 | #endif | |
983 | match_last = mctx->match_last; | |
984 | halt_node = mctx->last_node; | |
985 | ||
986 | /* Avoid overflow. */ | |
005de2e8 | 987 | if (BE (MIN (IDX_MAX, SIZE_MAX / sizeof (re_dfastate_t *)) <= match_last, 0)) |
eb4a14ed LC |
988 | return REG_ESPACE; |
989 | ||
990 | sifted_states = re_malloc (re_dfastate_t *, match_last + 1); | |
991 | if (BE (sifted_states == NULL, 0)) | |
992 | { | |
993 | ret = REG_ESPACE; | |
994 | goto free_return; | |
995 | } | |
996 | if (dfa->nbackref) | |
997 | { | |
998 | lim_states = re_malloc (re_dfastate_t *, match_last + 1); | |
999 | if (BE (lim_states == NULL, 0)) | |
1000 | { | |
1001 | ret = REG_ESPACE; | |
1002 | goto free_return; | |
1003 | } | |
1004 | while (1) | |
1005 | { | |
1006 | memset (lim_states, '\0', | |
1007 | sizeof (re_dfastate_t *) * (match_last + 1)); | |
1008 | sift_ctx_init (&sctx, sifted_states, lim_states, halt_node, | |
1009 | match_last); | |
1010 | ret = sift_states_backward (mctx, &sctx); | |
1011 | re_node_set_free (&sctx.limits); | |
1012 | if (BE (ret != REG_NOERROR, 0)) | |
1013 | goto free_return; | |
1014 | if (sifted_states[0] != NULL || lim_states[0] != NULL) | |
1015 | break; | |
1016 | do | |
1017 | { | |
1018 | --match_last; | |
1019 | if (! REG_VALID_INDEX (match_last)) | |
1020 | { | |
1021 | ret = REG_NOMATCH; | |
1022 | goto free_return; | |
1023 | } | |
1024 | } while (mctx->state_log[match_last] == NULL | |
1025 | || !mctx->state_log[match_last]->halt); | |
1026 | halt_node = check_halt_state_context (mctx, | |
1027 | mctx->state_log[match_last], | |
1028 | match_last); | |
1029 | } | |
1030 | ret = merge_state_array (dfa, sifted_states, lim_states, | |
1031 | match_last + 1); | |
1032 | re_free (lim_states); | |
1033 | lim_states = NULL; | |
1034 | if (BE (ret != REG_NOERROR, 0)) | |
1035 | goto free_return; | |
1036 | } | |
1037 | else | |
1038 | { | |
1039 | sift_ctx_init (&sctx, sifted_states, lim_states, halt_node, match_last); | |
1040 | ret = sift_states_backward (mctx, &sctx); | |
1041 | re_node_set_free (&sctx.limits); | |
1042 | if (BE (ret != REG_NOERROR, 0)) | |
1043 | goto free_return; | |
1044 | if (sifted_states[0] == NULL) | |
1045 | { | |
1046 | ret = REG_NOMATCH; | |
1047 | goto free_return; | |
1048 | } | |
1049 | } | |
1050 | re_free (mctx->state_log); | |
1051 | mctx->state_log = sifted_states; | |
1052 | sifted_states = NULL; | |
1053 | mctx->last_node = halt_node; | |
1054 | mctx->match_last = match_last; | |
1055 | ret = REG_NOERROR; | |
1056 | free_return: | |
1057 | re_free (sifted_states); | |
1058 | re_free (lim_states); | |
1059 | return ret; | |
1060 | } | |
1061 | ||
1062 | /* Acquire an initial state and return it. | |
1063 | We must select appropriate initial state depending on the context, | |
1064 | since initial states may have constraints like "\<", "^", etc.. */ | |
1065 | ||
1066 | static inline re_dfastate_t * | |
1067 | __attribute ((always_inline)) internal_function | |
1068 | acquire_init_state_context (reg_errcode_t *err, const re_match_context_t *mctx, | |
1069 | Idx idx) | |
1070 | { | |
1071 | const re_dfa_t *const dfa = mctx->dfa; | |
1072 | if (dfa->init_state->has_constraint) | |
1073 | { | |
1074 | unsigned int context; | |
1075 | context = re_string_context_at (&mctx->input, idx - 1, mctx->eflags); | |
1076 | if (IS_WORD_CONTEXT (context)) | |
1077 | return dfa->init_state_word; | |
1078 | else if (IS_ORDINARY_CONTEXT (context)) | |
1079 | return dfa->init_state; | |
1080 | else if (IS_BEGBUF_CONTEXT (context) && IS_NEWLINE_CONTEXT (context)) | |
1081 | return dfa->init_state_begbuf; | |
1082 | else if (IS_NEWLINE_CONTEXT (context)) | |
1083 | return dfa->init_state_nl; | |
1084 | else if (IS_BEGBUF_CONTEXT (context)) | |
1085 | { | |
1086 | /* It is relatively rare case, then calculate on demand. */ | |
1087 | return re_acquire_state_context (err, dfa, | |
1088 | dfa->init_state->entrance_nodes, | |
1089 | context); | |
1090 | } | |
1091 | else | |
1092 | /* Must not happen? */ | |
1093 | return dfa->init_state; | |
1094 | } | |
1095 | else | |
1096 | return dfa->init_state; | |
1097 | } | |
1098 | ||
1099 | /* Check whether the regular expression match input string INPUT or not, | |
1100 | and return the index where the matching end. Return REG_MISSING if | |
1101 | there is no match, and return REG_ERROR in case of an error. | |
1102 | FL_LONGEST_MATCH means we want the POSIX longest matching. | |
1103 | If P_MATCH_FIRST is not NULL, and the match fails, it is set to the | |
1104 | next place where we may want to try matching. | |
005de2e8 | 1105 | Note that the matcher assumes that the matching starts from the current |
eb4a14ed LC |
1106 | index of the buffer. */ |
1107 | ||
1108 | static Idx | |
1109 | internal_function __attribute_warn_unused_result__ | |
1110 | check_matching (re_match_context_t *mctx, bool fl_longest_match, | |
1111 | Idx *p_match_first) | |
1112 | { | |
1113 | const re_dfa_t *const dfa = mctx->dfa; | |
1114 | reg_errcode_t err; | |
1115 | Idx match = 0; | |
1116 | Idx match_last = REG_MISSING; | |
1117 | Idx cur_str_idx = re_string_cur_idx (&mctx->input); | |
1118 | re_dfastate_t *cur_state; | |
1119 | bool at_init_state = p_match_first != NULL; | |
1120 | Idx next_start_idx = cur_str_idx; | |
1121 | ||
1122 | err = REG_NOERROR; | |
1123 | cur_state = acquire_init_state_context (&err, mctx, cur_str_idx); | |
1124 | /* An initial state must not be NULL (invalid). */ | |
1125 | if (BE (cur_state == NULL, 0)) | |
1126 | { | |
1127 | assert (err == REG_ESPACE); | |
1128 | return REG_ERROR; | |
1129 | } | |
1130 | ||
1131 | if (mctx->state_log != NULL) | |
1132 | { | |
1133 | mctx->state_log[cur_str_idx] = cur_state; | |
1134 | ||
1135 | /* Check OP_OPEN_SUBEXP in the initial state in case that we use them | |
1136 | later. E.g. Processing back references. */ | |
1137 | if (BE (dfa->nbackref, 0)) | |
1138 | { | |
1139 | at_init_state = false; | |
1140 | err = check_subexp_matching_top (mctx, &cur_state->nodes, 0); | |
1141 | if (BE (err != REG_NOERROR, 0)) | |
1142 | return err; | |
1143 | ||
1144 | if (cur_state->has_backref) | |
1145 | { | |
1146 | err = transit_state_bkref (mctx, &cur_state->nodes); | |
1147 | if (BE (err != REG_NOERROR, 0)) | |
1148 | return err; | |
1149 | } | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | /* If the RE accepts NULL string. */ | |
1154 | if (BE (cur_state->halt, 0)) | |
1155 | { | |
1156 | if (!cur_state->has_constraint | |
1157 | || check_halt_state_context (mctx, cur_state, cur_str_idx)) | |
1158 | { | |
1159 | if (!fl_longest_match) | |
1160 | return cur_str_idx; | |
1161 | else | |
1162 | { | |
1163 | match_last = cur_str_idx; | |
1164 | match = 1; | |
1165 | } | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | while (!re_string_eoi (&mctx->input)) | |
1170 | { | |
1171 | re_dfastate_t *old_state = cur_state; | |
1172 | Idx next_char_idx = re_string_cur_idx (&mctx->input) + 1; | |
1173 | ||
005de2e8 LC |
1174 | if ((BE (next_char_idx >= mctx->input.bufs_len, 0) |
1175 | && mctx->input.bufs_len < mctx->input.len) | |
eb4a14ed LC |
1176 | || (BE (next_char_idx >= mctx->input.valid_len, 0) |
1177 | && mctx->input.valid_len < mctx->input.len)) | |
1178 | { | |
af07e104 | 1179 | err = extend_buffers (mctx, next_char_idx + 1); |
eb4a14ed LC |
1180 | if (BE (err != REG_NOERROR, 0)) |
1181 | { | |
1182 | assert (err == REG_ESPACE); | |
1183 | return REG_ERROR; | |
1184 | } | |
1185 | } | |
1186 | ||
1187 | cur_state = transit_state (&err, mctx, cur_state); | |
1188 | if (mctx->state_log != NULL) | |
1189 | cur_state = merge_state_with_log (&err, mctx, cur_state); | |
1190 | ||
1191 | if (cur_state == NULL) | |
1192 | { | |
1193 | /* Reached the invalid state or an error. Try to recover a valid | |
1194 | state using the state log, if available and if we have not | |
1195 | already found a valid (even if not the longest) match. */ | |
1196 | if (BE (err != REG_NOERROR, 0)) | |
1197 | return REG_ERROR; | |
1198 | ||
1199 | if (mctx->state_log == NULL | |
1200 | || (match && !fl_longest_match) | |
1201 | || (cur_state = find_recover_state (&err, mctx)) == NULL) | |
1202 | break; | |
1203 | } | |
1204 | ||
1205 | if (BE (at_init_state, 0)) | |
1206 | { | |
1207 | if (old_state == cur_state) | |
1208 | next_start_idx = next_char_idx; | |
1209 | else | |
1210 | at_init_state = false; | |
1211 | } | |
1212 | ||
1213 | if (cur_state->halt) | |
1214 | { | |
1215 | /* Reached a halt state. | |
1216 | Check the halt state can satisfy the current context. */ | |
1217 | if (!cur_state->has_constraint | |
1218 | || check_halt_state_context (mctx, cur_state, | |
1219 | re_string_cur_idx (&mctx->input))) | |
1220 | { | |
1221 | /* We found an appropriate halt state. */ | |
1222 | match_last = re_string_cur_idx (&mctx->input); | |
1223 | match = 1; | |
1224 | ||
1225 | /* We found a match, do not modify match_first below. */ | |
1226 | p_match_first = NULL; | |
1227 | if (!fl_longest_match) | |
1228 | break; | |
1229 | } | |
1230 | } | |
1231 | } | |
1232 | ||
1233 | if (p_match_first) | |
1234 | *p_match_first += next_start_idx; | |
1235 | ||
1236 | return match_last; | |
1237 | } | |
1238 | ||
1239 | /* Check NODE match the current context. */ | |
1240 | ||
1241 | static bool | |
1242 | internal_function | |
1243 | check_halt_node_context (const re_dfa_t *dfa, Idx node, unsigned int context) | |
1244 | { | |
1245 | re_token_type_t type = dfa->nodes[node].type; | |
1246 | unsigned int constraint = dfa->nodes[node].constraint; | |
1247 | if (type != END_OF_RE) | |
1248 | return false; | |
1249 | if (!constraint) | |
1250 | return true; | |
1251 | if (NOT_SATISFY_NEXT_CONSTRAINT (constraint, context)) | |
1252 | return false; | |
1253 | return true; | |
1254 | } | |
1255 | ||
1256 | /* Check the halt state STATE match the current context. | |
1257 | Return 0 if not match, if the node, STATE has, is a halt node and | |
1258 | match the context, return the node. */ | |
1259 | ||
1260 | static Idx | |
1261 | internal_function | |
1262 | check_halt_state_context (const re_match_context_t *mctx, | |
1263 | const re_dfastate_t *state, Idx idx) | |
1264 | { | |
1265 | Idx i; | |
1266 | unsigned int context; | |
1267 | #ifdef DEBUG | |
1268 | assert (state->halt); | |
1269 | #endif | |
1270 | context = re_string_context_at (&mctx->input, idx, mctx->eflags); | |
1271 | for (i = 0; i < state->nodes.nelem; ++i) | |
1272 | if (check_halt_node_context (mctx->dfa, state->nodes.elems[i], context)) | |
1273 | return state->nodes.elems[i]; | |
1274 | return 0; | |
1275 | } | |
1276 | ||
1277 | /* Compute the next node to which "NFA" transit from NODE("NFA" is a NFA | |
1278 | corresponding to the DFA). | |
1279 | Return the destination node, and update EPS_VIA_NODES; | |
1280 | return REG_MISSING in case of errors. */ | |
1281 | ||
1282 | static Idx | |
1283 | internal_function | |
1284 | proceed_next_node (const re_match_context_t *mctx, Idx nregs, regmatch_t *regs, | |
1285 | Idx *pidx, Idx node, re_node_set *eps_via_nodes, | |
1286 | struct re_fail_stack_t *fs) | |
1287 | { | |
1288 | const re_dfa_t *const dfa = mctx->dfa; | |
1289 | Idx i; | |
1290 | bool ok; | |
1291 | if (IS_EPSILON_NODE (dfa->nodes[node].type)) | |
1292 | { | |
1293 | re_node_set *cur_nodes = &mctx->state_log[*pidx]->nodes; | |
1294 | re_node_set *edests = &dfa->edests[node]; | |
1295 | Idx dest_node; | |
1296 | ok = re_node_set_insert (eps_via_nodes, node); | |
1297 | if (BE (! ok, 0)) | |
1298 | return REG_ERROR; | |
1299 | /* Pick up a valid destination, or return REG_MISSING if none | |
1300 | is found. */ | |
1301 | for (dest_node = REG_MISSING, i = 0; i < edests->nelem; ++i) | |
1302 | { | |
1303 | Idx candidate = edests->elems[i]; | |
1304 | if (!re_node_set_contains (cur_nodes, candidate)) | |
1305 | continue; | |
1306 | if (dest_node == REG_MISSING) | |
1307 | dest_node = candidate; | |
1308 | ||
1309 | else | |
1310 | { | |
1311 | /* In order to avoid infinite loop like "(a*)*", return the second | |
1312 | epsilon-transition if the first was already considered. */ | |
1313 | if (re_node_set_contains (eps_via_nodes, dest_node)) | |
1314 | return candidate; | |
1315 | ||
1316 | /* Otherwise, push the second epsilon-transition on the fail stack. */ | |
1317 | else if (fs != NULL | |
1318 | && push_fail_stack (fs, *pidx, candidate, nregs, regs, | |
1319 | eps_via_nodes)) | |
1320 | return REG_ERROR; | |
1321 | ||
1322 | /* We know we are going to exit. */ | |
1323 | break; | |
1324 | } | |
1325 | } | |
1326 | return dest_node; | |
1327 | } | |
1328 | else | |
1329 | { | |
1330 | Idx naccepted = 0; | |
1331 | re_token_type_t type = dfa->nodes[node].type; | |
1332 | ||
1333 | #ifdef RE_ENABLE_I18N | |
1334 | if (dfa->nodes[node].accept_mb) | |
1335 | naccepted = check_node_accept_bytes (dfa, node, &mctx->input, *pidx); | |
1336 | else | |
1337 | #endif /* RE_ENABLE_I18N */ | |
1338 | if (type == OP_BACK_REF) | |
1339 | { | |
1340 | Idx subexp_idx = dfa->nodes[node].opr.idx + 1; | |
1341 | naccepted = regs[subexp_idx].rm_eo - regs[subexp_idx].rm_so; | |
1342 | if (fs != NULL) | |
1343 | { | |
1344 | if (regs[subexp_idx].rm_so == -1 || regs[subexp_idx].rm_eo == -1) | |
1345 | return REG_MISSING; | |
1346 | else if (naccepted) | |
1347 | { | |
1348 | char *buf = (char *) re_string_get_buffer (&mctx->input); | |
1349 | if (memcmp (buf + regs[subexp_idx].rm_so, buf + *pidx, | |
1350 | naccepted) != 0) | |
1351 | return REG_MISSING; | |
1352 | } | |
1353 | } | |
1354 | ||
1355 | if (naccepted == 0) | |
1356 | { | |
1357 | Idx dest_node; | |
1358 | ok = re_node_set_insert (eps_via_nodes, node); | |
1359 | if (BE (! ok, 0)) | |
1360 | return REG_ERROR; | |
1361 | dest_node = dfa->edests[node].elems[0]; | |
1362 | if (re_node_set_contains (&mctx->state_log[*pidx]->nodes, | |
1363 | dest_node)) | |
1364 | return dest_node; | |
1365 | } | |
1366 | } | |
1367 | ||
1368 | if (naccepted != 0 | |
1369 | || check_node_accept (mctx, dfa->nodes + node, *pidx)) | |
1370 | { | |
1371 | Idx dest_node = dfa->nexts[node]; | |
1372 | *pidx = (naccepted == 0) ? *pidx + 1 : *pidx + naccepted; | |
1373 | if (fs && (*pidx > mctx->match_last || mctx->state_log[*pidx] == NULL | |
1374 | || !re_node_set_contains (&mctx->state_log[*pidx]->nodes, | |
1375 | dest_node))) | |
1376 | return REG_MISSING; | |
1377 | re_node_set_empty (eps_via_nodes); | |
1378 | return dest_node; | |
1379 | } | |
1380 | } | |
1381 | return REG_MISSING; | |
1382 | } | |
1383 | ||
1384 | static reg_errcode_t | |
1385 | internal_function __attribute_warn_unused_result__ | |
1386 | push_fail_stack (struct re_fail_stack_t *fs, Idx str_idx, Idx dest_node, | |
1387 | Idx nregs, regmatch_t *regs, re_node_set *eps_via_nodes) | |
1388 | { | |
1389 | reg_errcode_t err; | |
1390 | Idx num = fs->num++; | |
1391 | if (fs->num == fs->alloc) | |
1392 | { | |
1393 | struct re_fail_stack_ent_t *new_array; | |
1394 | new_array = realloc (fs->stack, (sizeof (struct re_fail_stack_ent_t) | |
1395 | * fs->alloc * 2)); | |
1396 | if (new_array == NULL) | |
1397 | return REG_ESPACE; | |
1398 | fs->alloc *= 2; | |
1399 | fs->stack = new_array; | |
1400 | } | |
1401 | fs->stack[num].idx = str_idx; | |
1402 | fs->stack[num].node = dest_node; | |
1403 | fs->stack[num].regs = re_malloc (regmatch_t, nregs); | |
1404 | if (fs->stack[num].regs == NULL) | |
1405 | return REG_ESPACE; | |
1406 | memcpy (fs->stack[num].regs, regs, sizeof (regmatch_t) * nregs); | |
1407 | err = re_node_set_init_copy (&fs->stack[num].eps_via_nodes, eps_via_nodes); | |
1408 | return err; | |
1409 | } | |
1410 | ||
1411 | static Idx | |
1412 | internal_function | |
1413 | pop_fail_stack (struct re_fail_stack_t *fs, Idx *pidx, Idx nregs, | |
1414 | regmatch_t *regs, re_node_set *eps_via_nodes) | |
1415 | { | |
1416 | Idx num = --fs->num; | |
1417 | assert (REG_VALID_INDEX (num)); | |
1418 | *pidx = fs->stack[num].idx; | |
1419 | memcpy (regs, fs->stack[num].regs, sizeof (regmatch_t) * nregs); | |
1420 | re_node_set_free (eps_via_nodes); | |
1421 | re_free (fs->stack[num].regs); | |
1422 | *eps_via_nodes = fs->stack[num].eps_via_nodes; | |
1423 | return fs->stack[num].node; | |
1424 | } | |
1425 | ||
1426 | /* Set the positions where the subexpressions are starts/ends to registers | |
1427 | PMATCH. | |
1428 | Note: We assume that pmatch[0] is already set, and | |
1429 | pmatch[i].rm_so == pmatch[i].rm_eo == -1 for 0 < i < nmatch. */ | |
1430 | ||
1431 | static reg_errcode_t | |
1432 | internal_function __attribute_warn_unused_result__ | |
1433 | set_regs (const regex_t *preg, const re_match_context_t *mctx, size_t nmatch, | |
1434 | regmatch_t *pmatch, bool fl_backtrack) | |
1435 | { | |
005de2e8 | 1436 | const re_dfa_t *dfa = preg->buffer; |
eb4a14ed LC |
1437 | Idx idx, cur_node; |
1438 | re_node_set eps_via_nodes; | |
1439 | struct re_fail_stack_t *fs; | |
1440 | struct re_fail_stack_t fs_body = { 0, 2, NULL }; | |
1441 | regmatch_t *prev_idx_match; | |
1442 | bool prev_idx_match_malloced = false; | |
1443 | ||
1444 | #ifdef DEBUG | |
1445 | assert (nmatch > 1); | |
1446 | assert (mctx->state_log != NULL); | |
1447 | #endif | |
1448 | if (fl_backtrack) | |
1449 | { | |
1450 | fs = &fs_body; | |
1451 | fs->stack = re_malloc (struct re_fail_stack_ent_t, fs->alloc); | |
1452 | if (fs->stack == NULL) | |
1453 | return REG_ESPACE; | |
1454 | } | |
1455 | else | |
1456 | fs = NULL; | |
1457 | ||
1458 | cur_node = dfa->init_node; | |
1459 | re_node_set_init_empty (&eps_via_nodes); | |
1460 | ||
1461 | if (__libc_use_alloca (nmatch * sizeof (regmatch_t))) | |
1462 | prev_idx_match = (regmatch_t *) alloca (nmatch * sizeof (regmatch_t)); | |
1463 | else | |
1464 | { | |
1465 | prev_idx_match = re_malloc (regmatch_t, nmatch); | |
1466 | if (prev_idx_match == NULL) | |
1467 | { | |
1468 | free_fail_stack_return (fs); | |
1469 | return REG_ESPACE; | |
1470 | } | |
1471 | prev_idx_match_malloced = true; | |
1472 | } | |
1473 | memcpy (prev_idx_match, pmatch, sizeof (regmatch_t) * nmatch); | |
1474 | ||
1475 | for (idx = pmatch[0].rm_so; idx <= pmatch[0].rm_eo ;) | |
1476 | { | |
1477 | update_regs (dfa, pmatch, prev_idx_match, cur_node, idx, nmatch); | |
1478 | ||
1479 | if (idx == pmatch[0].rm_eo && cur_node == mctx->last_node) | |
1480 | { | |
1481 | Idx reg_idx; | |
1482 | if (fs) | |
1483 | { | |
1484 | for (reg_idx = 0; reg_idx < nmatch; ++reg_idx) | |
1485 | if (pmatch[reg_idx].rm_so > -1 && pmatch[reg_idx].rm_eo == -1) | |
1486 | break; | |
1487 | if (reg_idx == nmatch) | |
1488 | { | |
1489 | re_node_set_free (&eps_via_nodes); | |
1490 | if (prev_idx_match_malloced) | |
1491 | re_free (prev_idx_match); | |
1492 | return free_fail_stack_return (fs); | |
1493 | } | |
1494 | cur_node = pop_fail_stack (fs, &idx, nmatch, pmatch, | |
1495 | &eps_via_nodes); | |
1496 | } | |
1497 | else | |
1498 | { | |
1499 | re_node_set_free (&eps_via_nodes); | |
1500 | if (prev_idx_match_malloced) | |
1501 | re_free (prev_idx_match); | |
1502 | return REG_NOERROR; | |
1503 | } | |
1504 | } | |
1505 | ||
1506 | /* Proceed to next node. */ | |
1507 | cur_node = proceed_next_node (mctx, nmatch, pmatch, &idx, cur_node, | |
1508 | &eps_via_nodes, fs); | |
1509 | ||
1510 | if (BE (! REG_VALID_INDEX (cur_node), 0)) | |
1511 | { | |
1512 | if (BE (cur_node == REG_ERROR, 0)) | |
1513 | { | |
1514 | re_node_set_free (&eps_via_nodes); | |
1515 | if (prev_idx_match_malloced) | |
1516 | re_free (prev_idx_match); | |
1517 | free_fail_stack_return (fs); | |
1518 | return REG_ESPACE; | |
1519 | } | |
1520 | if (fs) | |
1521 | cur_node = pop_fail_stack (fs, &idx, nmatch, pmatch, | |
1522 | &eps_via_nodes); | |
1523 | else | |
1524 | { | |
1525 | re_node_set_free (&eps_via_nodes); | |
1526 | if (prev_idx_match_malloced) | |
1527 | re_free (prev_idx_match); | |
1528 | return REG_NOMATCH; | |
1529 | } | |
1530 | } | |
1531 | } | |
1532 | re_node_set_free (&eps_via_nodes); | |
1533 | if (prev_idx_match_malloced) | |
1534 | re_free (prev_idx_match); | |
1535 | return free_fail_stack_return (fs); | |
1536 | } | |
1537 | ||
1538 | static reg_errcode_t | |
1539 | internal_function | |
1540 | free_fail_stack_return (struct re_fail_stack_t *fs) | |
1541 | { | |
1542 | if (fs) | |
1543 | { | |
1544 | Idx fs_idx; | |
1545 | for (fs_idx = 0; fs_idx < fs->num; ++fs_idx) | |
1546 | { | |
1547 | re_node_set_free (&fs->stack[fs_idx].eps_via_nodes); | |
1548 | re_free (fs->stack[fs_idx].regs); | |
1549 | } | |
1550 | re_free (fs->stack); | |
1551 | } | |
1552 | return REG_NOERROR; | |
1553 | } | |
1554 | ||
1555 | static void | |
1556 | internal_function | |
1557 | update_regs (const re_dfa_t *dfa, regmatch_t *pmatch, | |
1558 | regmatch_t *prev_idx_match, Idx cur_node, Idx cur_idx, Idx nmatch) | |
1559 | { | |
1560 | int type = dfa->nodes[cur_node].type; | |
1561 | if (type == OP_OPEN_SUBEXP) | |
1562 | { | |
1563 | Idx reg_num = dfa->nodes[cur_node].opr.idx + 1; | |
1564 | ||
1565 | /* We are at the first node of this sub expression. */ | |
1566 | if (reg_num < nmatch) | |
1567 | { | |
1568 | pmatch[reg_num].rm_so = cur_idx; | |
1569 | pmatch[reg_num].rm_eo = -1; | |
1570 | } | |
1571 | } | |
1572 | else if (type == OP_CLOSE_SUBEXP) | |
1573 | { | |
1574 | Idx reg_num = dfa->nodes[cur_node].opr.idx + 1; | |
1575 | if (reg_num < nmatch) | |
1576 | { | |
1577 | /* We are at the last node of this sub expression. */ | |
1578 | if (pmatch[reg_num].rm_so < cur_idx) | |
1579 | { | |
1580 | pmatch[reg_num].rm_eo = cur_idx; | |
1581 | /* This is a non-empty match or we are not inside an optional | |
1582 | subexpression. Accept this right away. */ | |
1583 | memcpy (prev_idx_match, pmatch, sizeof (regmatch_t) * nmatch); | |
1584 | } | |
1585 | else | |
1586 | { | |
1587 | if (dfa->nodes[cur_node].opt_subexp | |
1588 | && prev_idx_match[reg_num].rm_so != -1) | |
1589 | /* We transited through an empty match for an optional | |
1590 | subexpression, like (a?)*, and this is not the subexp's | |
1591 | first match. Copy back the old content of the registers | |
1592 | so that matches of an inner subexpression are undone as | |
1593 | well, like in ((a?))*. */ | |
1594 | memcpy (pmatch, prev_idx_match, sizeof (regmatch_t) * nmatch); | |
1595 | else | |
1596 | /* We completed a subexpression, but it may be part of | |
1597 | an optional one, so do not update PREV_IDX_MATCH. */ | |
1598 | pmatch[reg_num].rm_eo = cur_idx; | |
1599 | } | |
1600 | } | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | /* This function checks the STATE_LOG from the SCTX->last_str_idx to 0 | |
1605 | and sift the nodes in each states according to the following rules. | |
1606 | Updated state_log will be wrote to STATE_LOG. | |
1607 | ||
1608 | Rules: We throw away the Node 'a' in the STATE_LOG[STR_IDX] if... | |
1609 | 1. When STR_IDX == MATCH_LAST(the last index in the state_log): | |
1610 | If 'a' isn't the LAST_NODE and 'a' can't epsilon transit to | |
1611 | the LAST_NODE, we throw away the node 'a'. | |
1612 | 2. When 0 <= STR_IDX < MATCH_LAST and 'a' accepts | |
1613 | string 's' and transit to 'b': | |
1614 | i. If 'b' isn't in the STATE_LOG[STR_IDX+strlen('s')], we throw | |
1615 | away the node 'a'. | |
1616 | ii. If 'b' is in the STATE_LOG[STR_IDX+strlen('s')] but 'b' is | |
1617 | thrown away, we throw away the node 'a'. | |
1618 | 3. When 0 <= STR_IDX < MATCH_LAST and 'a' epsilon transit to 'b': | |
1619 | i. If 'b' isn't in the STATE_LOG[STR_IDX], we throw away the | |
1620 | node 'a'. | |
1621 | ii. If 'b' is in the STATE_LOG[STR_IDX] but 'b' is thrown away, | |
1622 | we throw away the node 'a'. */ | |
1623 | ||
1624 | #define STATE_NODE_CONTAINS(state,node) \ | |
1625 | ((state) != NULL && re_node_set_contains (&(state)->nodes, node)) | |
1626 | ||
1627 | static reg_errcode_t | |
1628 | internal_function | |
1629 | sift_states_backward (const re_match_context_t *mctx, re_sift_context_t *sctx) | |
1630 | { | |
1631 | reg_errcode_t err; | |
1632 | int null_cnt = 0; | |
1633 | Idx str_idx = sctx->last_str_idx; | |
1634 | re_node_set cur_dest; | |
1635 | ||
1636 | #ifdef DEBUG | |
1637 | assert (mctx->state_log != NULL && mctx->state_log[str_idx] != NULL); | |
1638 | #endif | |
1639 | ||
1640 | /* Build sifted state_log[str_idx]. It has the nodes which can epsilon | |
1641 | transit to the last_node and the last_node itself. */ | |
1642 | err = re_node_set_init_1 (&cur_dest, sctx->last_node); | |
1643 | if (BE (err != REG_NOERROR, 0)) | |
1644 | return err; | |
1645 | err = update_cur_sifted_state (mctx, sctx, str_idx, &cur_dest); | |
1646 | if (BE (err != REG_NOERROR, 0)) | |
1647 | goto free_return; | |
1648 | ||
1649 | /* Then check each states in the state_log. */ | |
1650 | while (str_idx > 0) | |
1651 | { | |
1652 | /* Update counters. */ | |
1653 | null_cnt = (sctx->sifted_states[str_idx] == NULL) ? null_cnt + 1 : 0; | |
1654 | if (null_cnt > mctx->max_mb_elem_len) | |
1655 | { | |
1656 | memset (sctx->sifted_states, '\0', | |
1657 | sizeof (re_dfastate_t *) * str_idx); | |
1658 | re_node_set_free (&cur_dest); | |
1659 | return REG_NOERROR; | |
1660 | } | |
1661 | re_node_set_empty (&cur_dest); | |
1662 | --str_idx; | |
1663 | ||
1664 | if (mctx->state_log[str_idx]) | |
1665 | { | |
1666 | err = build_sifted_states (mctx, sctx, str_idx, &cur_dest); | |
1667 | if (BE (err != REG_NOERROR, 0)) | |
1668 | goto free_return; | |
1669 | } | |
1670 | ||
1671 | /* Add all the nodes which satisfy the following conditions: | |
1672 | - It can epsilon transit to a node in CUR_DEST. | |
1673 | - It is in CUR_SRC. | |
1674 | And update state_log. */ | |
1675 | err = update_cur_sifted_state (mctx, sctx, str_idx, &cur_dest); | |
1676 | if (BE (err != REG_NOERROR, 0)) | |
1677 | goto free_return; | |
1678 | } | |
1679 | err = REG_NOERROR; | |
1680 | free_return: | |
1681 | re_node_set_free (&cur_dest); | |
1682 | return err; | |
1683 | } | |
1684 | ||
1685 | static reg_errcode_t | |
1686 | internal_function __attribute_warn_unused_result__ | |
1687 | build_sifted_states (const re_match_context_t *mctx, re_sift_context_t *sctx, | |
1688 | Idx str_idx, re_node_set *cur_dest) | |
1689 | { | |
1690 | const re_dfa_t *const dfa = mctx->dfa; | |
1691 | const re_node_set *cur_src = &mctx->state_log[str_idx]->non_eps_nodes; | |
1692 | Idx i; | |
1693 | ||
1694 | /* Then build the next sifted state. | |
1695 | We build the next sifted state on 'cur_dest', and update | |
1696 | 'sifted_states[str_idx]' with 'cur_dest'. | |
1697 | Note: | |
1698 | 'cur_dest' is the sifted state from 'state_log[str_idx + 1]'. | |
1699 | 'cur_src' points the node_set of the old 'state_log[str_idx]' | |
1700 | (with the epsilon nodes pre-filtered out). */ | |
1701 | for (i = 0; i < cur_src->nelem; i++) | |
1702 | { | |
1703 | Idx prev_node = cur_src->elems[i]; | |
1704 | int naccepted = 0; | |
1705 | bool ok; | |
1706 | ||
1707 | #ifdef DEBUG | |
1708 | re_token_type_t type = dfa->nodes[prev_node].type; | |
1709 | assert (!IS_EPSILON_NODE (type)); | |
1710 | #endif | |
1711 | #ifdef RE_ENABLE_I18N | |
1712 | /* If the node may accept "multi byte". */ | |
1713 | if (dfa->nodes[prev_node].accept_mb) | |
1714 | naccepted = sift_states_iter_mb (mctx, sctx, prev_node, | |
1715 | str_idx, sctx->last_str_idx); | |
1716 | #endif /* RE_ENABLE_I18N */ | |
1717 | ||
1718 | /* We don't check backreferences here. | |
1719 | See update_cur_sifted_state(). */ | |
1720 | if (!naccepted | |
1721 | && check_node_accept (mctx, dfa->nodes + prev_node, str_idx) | |
1722 | && STATE_NODE_CONTAINS (sctx->sifted_states[str_idx + 1], | |
1723 | dfa->nexts[prev_node])) | |
1724 | naccepted = 1; | |
1725 | ||
1726 | if (naccepted == 0) | |
1727 | continue; | |
1728 | ||
1729 | if (sctx->limits.nelem) | |
1730 | { | |
1731 | Idx to_idx = str_idx + naccepted; | |
1732 | if (check_dst_limits (mctx, &sctx->limits, | |
1733 | dfa->nexts[prev_node], to_idx, | |
1734 | prev_node, str_idx)) | |
1735 | continue; | |
1736 | } | |
1737 | ok = re_node_set_insert (cur_dest, prev_node); | |
1738 | if (BE (! ok, 0)) | |
1739 | return REG_ESPACE; | |
1740 | } | |
1741 | ||
1742 | return REG_NOERROR; | |
1743 | } | |
1744 | ||
1745 | /* Helper functions. */ | |
1746 | ||
1747 | static reg_errcode_t | |
1748 | internal_function | |
1749 | clean_state_log_if_needed (re_match_context_t *mctx, Idx next_state_log_idx) | |
1750 | { | |
1751 | Idx top = mctx->state_log_top; | |
1752 | ||
005de2e8 LC |
1753 | if ((next_state_log_idx >= mctx->input.bufs_len |
1754 | && mctx->input.bufs_len < mctx->input.len) | |
eb4a14ed LC |
1755 | || (next_state_log_idx >= mctx->input.valid_len |
1756 | && mctx->input.valid_len < mctx->input.len)) | |
1757 | { | |
1758 | reg_errcode_t err; | |
af07e104 | 1759 | err = extend_buffers (mctx, next_state_log_idx + 1); |
eb4a14ed LC |
1760 | if (BE (err != REG_NOERROR, 0)) |
1761 | return err; | |
1762 | } | |
1763 | ||
1764 | if (top < next_state_log_idx) | |
1765 | { | |
1766 | memset (mctx->state_log + top + 1, '\0', | |
1767 | sizeof (re_dfastate_t *) * (next_state_log_idx - top)); | |
1768 | mctx->state_log_top = next_state_log_idx; | |
1769 | } | |
1770 | return REG_NOERROR; | |
1771 | } | |
1772 | ||
1773 | static reg_errcode_t | |
1774 | internal_function | |
1775 | merge_state_array (const re_dfa_t *dfa, re_dfastate_t **dst, | |
1776 | re_dfastate_t **src, Idx num) | |
1777 | { | |
1778 | Idx st_idx; | |
1779 | reg_errcode_t err; | |
1780 | for (st_idx = 0; st_idx < num; ++st_idx) | |
1781 | { | |
1782 | if (dst[st_idx] == NULL) | |
1783 | dst[st_idx] = src[st_idx]; | |
1784 | else if (src[st_idx] != NULL) | |
1785 | { | |
1786 | re_node_set merged_set; | |
1787 | err = re_node_set_init_union (&merged_set, &dst[st_idx]->nodes, | |
1788 | &src[st_idx]->nodes); | |
1789 | if (BE (err != REG_NOERROR, 0)) | |
1790 | return err; | |
1791 | dst[st_idx] = re_acquire_state (&err, dfa, &merged_set); | |
1792 | re_node_set_free (&merged_set); | |
1793 | if (BE (err != REG_NOERROR, 0)) | |
1794 | return err; | |
1795 | } | |
1796 | } | |
1797 | return REG_NOERROR; | |
1798 | } | |
1799 | ||
1800 | static reg_errcode_t | |
1801 | internal_function | |
1802 | update_cur_sifted_state (const re_match_context_t *mctx, | |
1803 | re_sift_context_t *sctx, Idx str_idx, | |
1804 | re_node_set *dest_nodes) | |
1805 | { | |
1806 | const re_dfa_t *const dfa = mctx->dfa; | |
1807 | reg_errcode_t err = REG_NOERROR; | |
1808 | const re_node_set *candidates; | |
1809 | candidates = ((mctx->state_log[str_idx] == NULL) ? NULL | |
1810 | : &mctx->state_log[str_idx]->nodes); | |
1811 | ||
1812 | if (dest_nodes->nelem == 0) | |
1813 | sctx->sifted_states[str_idx] = NULL; | |
1814 | else | |
1815 | { | |
1816 | if (candidates) | |
1817 | { | |
1818 | /* At first, add the nodes which can epsilon transit to a node in | |
1819 | DEST_NODE. */ | |
1820 | err = add_epsilon_src_nodes (dfa, dest_nodes, candidates); | |
1821 | if (BE (err != REG_NOERROR, 0)) | |
1822 | return err; | |
1823 | ||
1824 | /* Then, check the limitations in the current sift_context. */ | |
1825 | if (sctx->limits.nelem) | |
1826 | { | |
1827 | err = check_subexp_limits (dfa, dest_nodes, candidates, &sctx->limits, | |
1828 | mctx->bkref_ents, str_idx); | |
1829 | if (BE (err != REG_NOERROR, 0)) | |
1830 | return err; | |
1831 | } | |
1832 | } | |
1833 | ||
1834 | sctx->sifted_states[str_idx] = re_acquire_state (&err, dfa, dest_nodes); | |
1835 | if (BE (err != REG_NOERROR, 0)) | |
1836 | return err; | |
1837 | } | |
1838 | ||
1839 | if (candidates && mctx->state_log[str_idx]->has_backref) | |
1840 | { | |
1841 | err = sift_states_bkref (mctx, sctx, str_idx, candidates); | |
1842 | if (BE (err != REG_NOERROR, 0)) | |
1843 | return err; | |
1844 | } | |
1845 | return REG_NOERROR; | |
1846 | } | |
1847 | ||
1848 | static reg_errcode_t | |
1849 | internal_function __attribute_warn_unused_result__ | |
1850 | add_epsilon_src_nodes (const re_dfa_t *dfa, re_node_set *dest_nodes, | |
1851 | const re_node_set *candidates) | |
1852 | { | |
1853 | reg_errcode_t err = REG_NOERROR; | |
1854 | Idx i; | |
1855 | ||
1856 | re_dfastate_t *state = re_acquire_state (&err, dfa, dest_nodes); | |
1857 | if (BE (err != REG_NOERROR, 0)) | |
1858 | return err; | |
1859 | ||
1860 | if (!state->inveclosure.alloc) | |
1861 | { | |
1862 | err = re_node_set_alloc (&state->inveclosure, dest_nodes->nelem); | |
1863 | if (BE (err != REG_NOERROR, 0)) | |
1864 | return REG_ESPACE; | |
1865 | for (i = 0; i < dest_nodes->nelem; i++) | |
1866 | { | |
1867 | err = re_node_set_merge (&state->inveclosure, | |
1868 | dfa->inveclosures + dest_nodes->elems[i]); | |
1869 | if (BE (err != REG_NOERROR, 0)) | |
1870 | return REG_ESPACE; | |
1871 | } | |
1872 | } | |
1873 | return re_node_set_add_intersect (dest_nodes, candidates, | |
1874 | &state->inveclosure); | |
1875 | } | |
1876 | ||
1877 | static reg_errcode_t | |
1878 | internal_function | |
1879 | sub_epsilon_src_nodes (const re_dfa_t *dfa, Idx node, re_node_set *dest_nodes, | |
1880 | const re_node_set *candidates) | |
1881 | { | |
1882 | Idx ecl_idx; | |
1883 | reg_errcode_t err; | |
1884 | re_node_set *inv_eclosure = dfa->inveclosures + node; | |
1885 | re_node_set except_nodes; | |
1886 | re_node_set_init_empty (&except_nodes); | |
1887 | for (ecl_idx = 0; ecl_idx < inv_eclosure->nelem; ++ecl_idx) | |
1888 | { | |
1889 | Idx cur_node = inv_eclosure->elems[ecl_idx]; | |
1890 | if (cur_node == node) | |
1891 | continue; | |
1892 | if (IS_EPSILON_NODE (dfa->nodes[cur_node].type)) | |
1893 | { | |
1894 | Idx edst1 = dfa->edests[cur_node].elems[0]; | |
1895 | Idx edst2 = ((dfa->edests[cur_node].nelem > 1) | |
1896 | ? dfa->edests[cur_node].elems[1] : REG_MISSING); | |
1897 | if ((!re_node_set_contains (inv_eclosure, edst1) | |
1898 | && re_node_set_contains (dest_nodes, edst1)) | |
1899 | || (REG_VALID_NONZERO_INDEX (edst2) | |
1900 | && !re_node_set_contains (inv_eclosure, edst2) | |
1901 | && re_node_set_contains (dest_nodes, edst2))) | |
1902 | { | |
1903 | err = re_node_set_add_intersect (&except_nodes, candidates, | |
1904 | dfa->inveclosures + cur_node); | |
1905 | if (BE (err != REG_NOERROR, 0)) | |
1906 | { | |
1907 | re_node_set_free (&except_nodes); | |
1908 | return err; | |
1909 | } | |
1910 | } | |
1911 | } | |
1912 | } | |
1913 | for (ecl_idx = 0; ecl_idx < inv_eclosure->nelem; ++ecl_idx) | |
1914 | { | |
1915 | Idx cur_node = inv_eclosure->elems[ecl_idx]; | |
1916 | if (!re_node_set_contains (&except_nodes, cur_node)) | |
1917 | { | |
1918 | Idx idx = re_node_set_contains (dest_nodes, cur_node) - 1; | |
1919 | re_node_set_remove_at (dest_nodes, idx); | |
1920 | } | |
1921 | } | |
1922 | re_node_set_free (&except_nodes); | |
1923 | return REG_NOERROR; | |
1924 | } | |
1925 | ||
1926 | static bool | |
1927 | internal_function | |
1928 | check_dst_limits (const re_match_context_t *mctx, const re_node_set *limits, | |
1929 | Idx dst_node, Idx dst_idx, Idx src_node, Idx src_idx) | |
1930 | { | |
1931 | const re_dfa_t *const dfa = mctx->dfa; | |
1932 | Idx lim_idx, src_pos, dst_pos; | |
1933 | ||
1934 | Idx dst_bkref_idx = search_cur_bkref_entry (mctx, dst_idx); | |
1935 | Idx src_bkref_idx = search_cur_bkref_entry (mctx, src_idx); | |
1936 | for (lim_idx = 0; lim_idx < limits->nelem; ++lim_idx) | |
1937 | { | |
1938 | Idx subexp_idx; | |
1939 | struct re_backref_cache_entry *ent; | |
1940 | ent = mctx->bkref_ents + limits->elems[lim_idx]; | |
1941 | subexp_idx = dfa->nodes[ent->node].opr.idx; | |
1942 | ||
1943 | dst_pos = check_dst_limits_calc_pos (mctx, limits->elems[lim_idx], | |
1944 | subexp_idx, dst_node, dst_idx, | |
1945 | dst_bkref_idx); | |
1946 | src_pos = check_dst_limits_calc_pos (mctx, limits->elems[lim_idx], | |
1947 | subexp_idx, src_node, src_idx, | |
1948 | src_bkref_idx); | |
1949 | ||
1950 | /* In case of: | |
1951 | <src> <dst> ( <subexp> ) | |
1952 | ( <subexp> ) <src> <dst> | |
1953 | ( <subexp1> <src> <subexp2> <dst> <subexp3> ) */ | |
1954 | if (src_pos == dst_pos) | |
1955 | continue; /* This is unrelated limitation. */ | |
1956 | else | |
1957 | return true; | |
1958 | } | |
1959 | return false; | |
1960 | } | |
1961 | ||
1962 | static int | |
1963 | internal_function | |
1964 | check_dst_limits_calc_pos_1 (const re_match_context_t *mctx, int boundaries, | |
1965 | Idx subexp_idx, Idx from_node, Idx bkref_idx) | |
1966 | { | |
1967 | const re_dfa_t *const dfa = mctx->dfa; | |
1968 | const re_node_set *eclosures = dfa->eclosures + from_node; | |
1969 | Idx node_idx; | |
1970 | ||
1971 | /* Else, we are on the boundary: examine the nodes on the epsilon | |
1972 | closure. */ | |
1973 | for (node_idx = 0; node_idx < eclosures->nelem; ++node_idx) | |
1974 | { | |
1975 | Idx node = eclosures->elems[node_idx]; | |
1976 | switch (dfa->nodes[node].type) | |
1977 | { | |
1978 | case OP_BACK_REF: | |
1979 | if (bkref_idx != REG_MISSING) | |
1980 | { | |
1981 | struct re_backref_cache_entry *ent = mctx->bkref_ents + bkref_idx; | |
1982 | do | |
1983 | { | |
1984 | Idx dst; | |
1985 | int cpos; | |
1986 | ||
1987 | if (ent->node != node) | |
1988 | continue; | |
1989 | ||
1990 | if (subexp_idx < BITSET_WORD_BITS | |
1991 | && !(ent->eps_reachable_subexps_map | |
1992 | & ((bitset_word_t) 1 << subexp_idx))) | |
1993 | continue; | |
1994 | ||
1995 | /* Recurse trying to reach the OP_OPEN_SUBEXP and | |
1996 | OP_CLOSE_SUBEXP cases below. But, if the | |
1997 | destination node is the same node as the source | |
1998 | node, don't recurse because it would cause an | |
1999 | infinite loop: a regex that exhibits this behavior | |
2000 | is ()\1*\1* */ | |
2001 | dst = dfa->edests[node].elems[0]; | |
2002 | if (dst == from_node) | |
2003 | { | |
2004 | if (boundaries & 1) | |
2005 | return -1; | |
2006 | else /* if (boundaries & 2) */ | |
2007 | return 0; | |
2008 | } | |
2009 | ||
2010 | cpos = | |
2011 | check_dst_limits_calc_pos_1 (mctx, boundaries, subexp_idx, | |
2012 | dst, bkref_idx); | |
2013 | if (cpos == -1 /* && (boundaries & 1) */) | |
2014 | return -1; | |
2015 | if (cpos == 0 && (boundaries & 2)) | |
2016 | return 0; | |
2017 | ||
2018 | if (subexp_idx < BITSET_WORD_BITS) | |
2019 | ent->eps_reachable_subexps_map | |
2020 | &= ~((bitset_word_t) 1 << subexp_idx); | |
2021 | } | |
2022 | while (ent++->more); | |
2023 | } | |
2024 | break; | |
2025 | ||
2026 | case OP_OPEN_SUBEXP: | |
2027 | if ((boundaries & 1) && subexp_idx == dfa->nodes[node].opr.idx) | |
2028 | return -1; | |
2029 | break; | |
2030 | ||
2031 | case OP_CLOSE_SUBEXP: | |
2032 | if ((boundaries & 2) && subexp_idx == dfa->nodes[node].opr.idx) | |
2033 | return 0; | |
2034 | break; | |
2035 | ||
2036 | default: | |
2037 | break; | |
2038 | } | |
2039 | } | |
2040 | ||
2041 | return (boundaries & 2) ? 1 : 0; | |
2042 | } | |
2043 | ||
2044 | static int | |
2045 | internal_function | |
2046 | check_dst_limits_calc_pos (const re_match_context_t *mctx, Idx limit, | |
2047 | Idx subexp_idx, Idx from_node, Idx str_idx, | |
2048 | Idx bkref_idx) | |
2049 | { | |
2050 | struct re_backref_cache_entry *lim = mctx->bkref_ents + limit; | |
2051 | int boundaries; | |
2052 | ||
2053 | /* If we are outside the range of the subexpression, return -1 or 1. */ | |
2054 | if (str_idx < lim->subexp_from) | |
2055 | return -1; | |
2056 | ||
2057 | if (lim->subexp_to < str_idx) | |
2058 | return 1; | |
2059 | ||
2060 | /* If we are within the subexpression, return 0. */ | |
2061 | boundaries = (str_idx == lim->subexp_from); | |
2062 | boundaries |= (str_idx == lim->subexp_to) << 1; | |
2063 | if (boundaries == 0) | |
2064 | return 0; | |
2065 | ||
2066 | /* Else, examine epsilon closure. */ | |
2067 | return check_dst_limits_calc_pos_1 (mctx, boundaries, subexp_idx, | |
2068 | from_node, bkref_idx); | |
2069 | } | |
2070 | ||
2071 | /* Check the limitations of sub expressions LIMITS, and remove the nodes | |
2072 | which are against limitations from DEST_NODES. */ | |
2073 | ||
2074 | static reg_errcode_t | |
2075 | internal_function | |
2076 | check_subexp_limits (const re_dfa_t *dfa, re_node_set *dest_nodes, | |
2077 | const re_node_set *candidates, re_node_set *limits, | |
2078 | struct re_backref_cache_entry *bkref_ents, Idx str_idx) | |
2079 | { | |
2080 | reg_errcode_t err; | |
2081 | Idx node_idx, lim_idx; | |
2082 | ||
2083 | for (lim_idx = 0; lim_idx < limits->nelem; ++lim_idx) | |
2084 | { | |
2085 | Idx subexp_idx; | |
2086 | struct re_backref_cache_entry *ent; | |
2087 | ent = bkref_ents + limits->elems[lim_idx]; | |
2088 | ||
2089 | if (str_idx <= ent->subexp_from || ent->str_idx < str_idx) | |
2090 | continue; /* This is unrelated limitation. */ | |
2091 | ||
2092 | subexp_idx = dfa->nodes[ent->node].opr.idx; | |
2093 | if (ent->subexp_to == str_idx) | |
2094 | { | |
2095 | Idx ops_node = REG_MISSING; | |
2096 | Idx cls_node = REG_MISSING; | |
2097 | for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx) | |
2098 | { | |
2099 | Idx node = dest_nodes->elems[node_idx]; | |
2100 | re_token_type_t type = dfa->nodes[node].type; | |
2101 | if (type == OP_OPEN_SUBEXP | |
2102 | && subexp_idx == dfa->nodes[node].opr.idx) | |
2103 | ops_node = node; | |
2104 | else if (type == OP_CLOSE_SUBEXP | |
2105 | && subexp_idx == dfa->nodes[node].opr.idx) | |
2106 | cls_node = node; | |
2107 | } | |
2108 | ||
2109 | /* Check the limitation of the open subexpression. */ | |
2110 | /* Note that (ent->subexp_to = str_idx != ent->subexp_from). */ | |
2111 | if (REG_VALID_INDEX (ops_node)) | |
2112 | { | |
2113 | err = sub_epsilon_src_nodes (dfa, ops_node, dest_nodes, | |
2114 | candidates); | |
2115 | if (BE (err != REG_NOERROR, 0)) | |
2116 | return err; | |
2117 | } | |
2118 | ||
2119 | /* Check the limitation of the close subexpression. */ | |
2120 | if (REG_VALID_INDEX (cls_node)) | |
2121 | for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx) | |
2122 | { | |
2123 | Idx node = dest_nodes->elems[node_idx]; | |
2124 | if (!re_node_set_contains (dfa->inveclosures + node, | |
2125 | cls_node) | |
2126 | && !re_node_set_contains (dfa->eclosures + node, | |
2127 | cls_node)) | |
2128 | { | |
2129 | /* It is against this limitation. | |
2130 | Remove it form the current sifted state. */ | |
2131 | err = sub_epsilon_src_nodes (dfa, node, dest_nodes, | |
2132 | candidates); | |
2133 | if (BE (err != REG_NOERROR, 0)) | |
2134 | return err; | |
2135 | --node_idx; | |
2136 | } | |
2137 | } | |
2138 | } | |
2139 | else /* (ent->subexp_to != str_idx) */ | |
2140 | { | |
2141 | for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx) | |
2142 | { | |
2143 | Idx node = dest_nodes->elems[node_idx]; | |
2144 | re_token_type_t type = dfa->nodes[node].type; | |
2145 | if (type == OP_CLOSE_SUBEXP || type == OP_OPEN_SUBEXP) | |
2146 | { | |
2147 | if (subexp_idx != dfa->nodes[node].opr.idx) | |
2148 | continue; | |
2149 | /* It is against this limitation. | |
2150 | Remove it form the current sifted state. */ | |
2151 | err = sub_epsilon_src_nodes (dfa, node, dest_nodes, | |
2152 | candidates); | |
2153 | if (BE (err != REG_NOERROR, 0)) | |
2154 | return err; | |
2155 | } | |
2156 | } | |
2157 | } | |
2158 | } | |
2159 | return REG_NOERROR; | |
2160 | } | |
2161 | ||
2162 | static reg_errcode_t | |
2163 | internal_function __attribute_warn_unused_result__ | |
2164 | sift_states_bkref (const re_match_context_t *mctx, re_sift_context_t *sctx, | |
2165 | Idx str_idx, const re_node_set *candidates) | |
2166 | { | |
2167 | const re_dfa_t *const dfa = mctx->dfa; | |
2168 | reg_errcode_t err; | |
2169 | Idx node_idx, node; | |
2170 | re_sift_context_t local_sctx; | |
2171 | Idx first_idx = search_cur_bkref_entry (mctx, str_idx); | |
2172 | ||
2173 | if (first_idx == REG_MISSING) | |
2174 | return REG_NOERROR; | |
2175 | ||
2176 | local_sctx.sifted_states = NULL; /* Mark that it hasn't been initialized. */ | |
2177 | ||
2178 | for (node_idx = 0; node_idx < candidates->nelem; ++node_idx) | |
2179 | { | |
2180 | Idx enabled_idx; | |
2181 | re_token_type_t type; | |
2182 | struct re_backref_cache_entry *entry; | |
2183 | node = candidates->elems[node_idx]; | |
2184 | type = dfa->nodes[node].type; | |
2185 | /* Avoid infinite loop for the REs like "()\1+". */ | |
2186 | if (node == sctx->last_node && str_idx == sctx->last_str_idx) | |
2187 | continue; | |
2188 | if (type != OP_BACK_REF) | |
2189 | continue; | |
2190 | ||
2191 | entry = mctx->bkref_ents + first_idx; | |
2192 | enabled_idx = first_idx; | |
2193 | do | |
2194 | { | |
2195 | Idx subexp_len; | |
2196 | Idx to_idx; | |
2197 | Idx dst_node; | |
2198 | bool ok; | |
2199 | re_dfastate_t *cur_state; | |
2200 | ||
2201 | if (entry->node != node) | |
2202 | continue; | |
2203 | subexp_len = entry->subexp_to - entry->subexp_from; | |
2204 | to_idx = str_idx + subexp_len; | |
2205 | dst_node = (subexp_len ? dfa->nexts[node] | |
2206 | : dfa->edests[node].elems[0]); | |
2207 | ||
2208 | if (to_idx > sctx->last_str_idx | |
2209 | || sctx->sifted_states[to_idx] == NULL | |
2210 | || !STATE_NODE_CONTAINS (sctx->sifted_states[to_idx], dst_node) | |
2211 | || check_dst_limits (mctx, &sctx->limits, node, | |
2212 | str_idx, dst_node, to_idx)) | |
2213 | continue; | |
2214 | ||
2215 | if (local_sctx.sifted_states == NULL) | |
2216 | { | |
2217 | local_sctx = *sctx; | |
2218 | err = re_node_set_init_copy (&local_sctx.limits, &sctx->limits); | |
2219 | if (BE (err != REG_NOERROR, 0)) | |
2220 | goto free_return; | |
2221 | } | |
2222 | local_sctx.last_node = node; | |
2223 | local_sctx.last_str_idx = str_idx; | |
2224 | ok = re_node_set_insert (&local_sctx.limits, enabled_idx); | |
2225 | if (BE (! ok, 0)) | |
2226 | { | |
2227 | err = REG_ESPACE; | |
2228 | goto free_return; | |
2229 | } | |
2230 | cur_state = local_sctx.sifted_states[str_idx]; | |
2231 | err = sift_states_backward (mctx, &local_sctx); | |
2232 | if (BE (err != REG_NOERROR, 0)) | |
2233 | goto free_return; | |
2234 | if (sctx->limited_states != NULL) | |
2235 | { | |
2236 | err = merge_state_array (dfa, sctx->limited_states, | |
2237 | local_sctx.sifted_states, | |
2238 | str_idx + 1); | |
2239 | if (BE (err != REG_NOERROR, 0)) | |
2240 | goto free_return; | |
2241 | } | |
2242 | local_sctx.sifted_states[str_idx] = cur_state; | |
2243 | re_node_set_remove (&local_sctx.limits, enabled_idx); | |
2244 | ||
2245 | /* mctx->bkref_ents may have changed, reload the pointer. */ | |
2246 | entry = mctx->bkref_ents + enabled_idx; | |
2247 | } | |
2248 | while (enabled_idx++, entry++->more); | |
2249 | } | |
2250 | err = REG_NOERROR; | |
2251 | free_return: | |
2252 | if (local_sctx.sifted_states != NULL) | |
2253 | { | |
2254 | re_node_set_free (&local_sctx.limits); | |
2255 | } | |
2256 | ||
2257 | return err; | |
2258 | } | |
2259 | ||
2260 | ||
2261 | #ifdef RE_ENABLE_I18N | |
2262 | static int | |
2263 | internal_function | |
2264 | sift_states_iter_mb (const re_match_context_t *mctx, re_sift_context_t *sctx, | |
2265 | Idx node_idx, Idx str_idx, Idx max_str_idx) | |
2266 | { | |
2267 | const re_dfa_t *const dfa = mctx->dfa; | |
2268 | int naccepted; | |
2269 | /* Check the node can accept "multi byte". */ | |
2270 | naccepted = check_node_accept_bytes (dfa, node_idx, &mctx->input, str_idx); | |
2271 | if (naccepted > 0 && str_idx + naccepted <= max_str_idx && | |
2272 | !STATE_NODE_CONTAINS (sctx->sifted_states[str_idx + naccepted], | |
2273 | dfa->nexts[node_idx])) | |
2274 | /* The node can't accept the "multi byte", or the | |
2275 | destination was already thrown away, then the node | |
2276 | could't accept the current input "multi byte". */ | |
2277 | naccepted = 0; | |
2278 | /* Otherwise, it is sure that the node could accept | |
2279 | 'naccepted' bytes input. */ | |
2280 | return naccepted; | |
2281 | } | |
2282 | #endif /* RE_ENABLE_I18N */ | |
2283 | ||
2284 | \f | |
2285 | /* Functions for state transition. */ | |
2286 | ||
2287 | /* Return the next state to which the current state STATE will transit by | |
2288 | accepting the current input byte, and update STATE_LOG if necessary. | |
2289 | If STATE can accept a multibyte char/collating element/back reference | |
2290 | update the destination of STATE_LOG. */ | |
2291 | ||
2292 | static re_dfastate_t * | |
2293 | internal_function __attribute_warn_unused_result__ | |
2294 | transit_state (reg_errcode_t *err, re_match_context_t *mctx, | |
2295 | re_dfastate_t *state) | |
2296 | { | |
2297 | re_dfastate_t **trtable; | |
2298 | unsigned char ch; | |
2299 | ||
2300 | #ifdef RE_ENABLE_I18N | |
2301 | /* If the current state can accept multibyte. */ | |
2302 | if (BE (state->accept_mb, 0)) | |
2303 | { | |
2304 | *err = transit_state_mb (mctx, state); | |
2305 | if (BE (*err != REG_NOERROR, 0)) | |
2306 | return NULL; | |
2307 | } | |
2308 | #endif /* RE_ENABLE_I18N */ | |
2309 | ||
2310 | /* Then decide the next state with the single byte. */ | |
2311 | #if 0 | |
2312 | if (0) | |
2313 | /* don't use transition table */ | |
2314 | return transit_state_sb (err, mctx, state); | |
2315 | #endif | |
2316 | ||
2317 | /* Use transition table */ | |
2318 | ch = re_string_fetch_byte (&mctx->input); | |
2319 | for (;;) | |
2320 | { | |
2321 | trtable = state->trtable; | |
2322 | if (BE (trtable != NULL, 1)) | |
2323 | return trtable[ch]; | |
2324 | ||
2325 | trtable = state->word_trtable; | |
2326 | if (BE (trtable != NULL, 1)) | |
2327 | { | |
2328 | unsigned int context; | |
2329 | context | |
2330 | = re_string_context_at (&mctx->input, | |
2331 | re_string_cur_idx (&mctx->input) - 1, | |
2332 | mctx->eflags); | |
2333 | if (IS_WORD_CONTEXT (context)) | |
2334 | return trtable[ch + SBC_MAX]; | |
2335 | else | |
2336 | return trtable[ch]; | |
2337 | } | |
2338 | ||
2339 | if (!build_trtable (mctx->dfa, state)) | |
2340 | { | |
2341 | *err = REG_ESPACE; | |
2342 | return NULL; | |
2343 | } | |
2344 | ||
2345 | /* Retry, we now have a transition table. */ | |
2346 | } | |
2347 | } | |
2348 | ||
2349 | /* Update the state_log if we need */ | |
2350 | static re_dfastate_t * | |
2351 | internal_function | |
2352 | merge_state_with_log (reg_errcode_t *err, re_match_context_t *mctx, | |
2353 | re_dfastate_t *next_state) | |
2354 | { | |
2355 | const re_dfa_t *const dfa = mctx->dfa; | |
2356 | Idx cur_idx = re_string_cur_idx (&mctx->input); | |
2357 | ||
2358 | if (cur_idx > mctx->state_log_top) | |
2359 | { | |
2360 | mctx->state_log[cur_idx] = next_state; | |
2361 | mctx->state_log_top = cur_idx; | |
2362 | } | |
2363 | else if (mctx->state_log[cur_idx] == 0) | |
2364 | { | |
2365 | mctx->state_log[cur_idx] = next_state; | |
2366 | } | |
2367 | else | |
2368 | { | |
2369 | re_dfastate_t *pstate; | |
2370 | unsigned int context; | |
2371 | re_node_set next_nodes, *log_nodes, *table_nodes = NULL; | |
2372 | /* If (state_log[cur_idx] != 0), it implies that cur_idx is | |
2373 | the destination of a multibyte char/collating element/ | |
2374 | back reference. Then the next state is the union set of | |
2375 | these destinations and the results of the transition table. */ | |
2376 | pstate = mctx->state_log[cur_idx]; | |
2377 | log_nodes = pstate->entrance_nodes; | |
2378 | if (next_state != NULL) | |
2379 | { | |
2380 | table_nodes = next_state->entrance_nodes; | |
2381 | *err = re_node_set_init_union (&next_nodes, table_nodes, | |
2382 | log_nodes); | |
2383 | if (BE (*err != REG_NOERROR, 0)) | |
2384 | return NULL; | |
2385 | } | |
2386 | else | |
2387 | next_nodes = *log_nodes; | |
2388 | /* Note: We already add the nodes of the initial state, | |
2389 | then we don't need to add them here. */ | |
2390 | ||
2391 | context = re_string_context_at (&mctx->input, | |
2392 | re_string_cur_idx (&mctx->input) - 1, | |
2393 | mctx->eflags); | |
2394 | next_state = mctx->state_log[cur_idx] | |
2395 | = re_acquire_state_context (err, dfa, &next_nodes, context); | |
2396 | /* We don't need to check errors here, since the return value of | |
2397 | this function is next_state and ERR is already set. */ | |
2398 | ||
2399 | if (table_nodes != NULL) | |
2400 | re_node_set_free (&next_nodes); | |
2401 | } | |
2402 | ||
2403 | if (BE (dfa->nbackref, 0) && next_state != NULL) | |
2404 | { | |
2405 | /* Check OP_OPEN_SUBEXP in the current state in case that we use them | |
2406 | later. We must check them here, since the back references in the | |
2407 | next state might use them. */ | |
2408 | *err = check_subexp_matching_top (mctx, &next_state->nodes, | |
2409 | cur_idx); | |
2410 | if (BE (*err != REG_NOERROR, 0)) | |
2411 | return NULL; | |
2412 | ||
2413 | /* If the next state has back references. */ | |
2414 | if (next_state->has_backref) | |
2415 | { | |
2416 | *err = transit_state_bkref (mctx, &next_state->nodes); | |
2417 | if (BE (*err != REG_NOERROR, 0)) | |
2418 | return NULL; | |
2419 | next_state = mctx->state_log[cur_idx]; | |
2420 | } | |
2421 | } | |
2422 | ||
2423 | return next_state; | |
2424 | } | |
2425 | ||
2426 | /* Skip bytes in the input that correspond to part of a | |
2427 | multi-byte match, then look in the log for a state | |
2428 | from which to restart matching. */ | |
2429 | static re_dfastate_t * | |
2430 | internal_function | |
2431 | find_recover_state (reg_errcode_t *err, re_match_context_t *mctx) | |
2432 | { | |
2433 | re_dfastate_t *cur_state; | |
2434 | do | |
2435 | { | |
2436 | Idx max = mctx->state_log_top; | |
2437 | Idx cur_str_idx = re_string_cur_idx (&mctx->input); | |
2438 | ||
2439 | do | |
2440 | { | |
2441 | if (++cur_str_idx > max) | |
2442 | return NULL; | |
2443 | re_string_skip_bytes (&mctx->input, 1); | |
2444 | } | |
2445 | while (mctx->state_log[cur_str_idx] == NULL); | |
2446 | ||
2447 | cur_state = merge_state_with_log (err, mctx, NULL); | |
2448 | } | |
2449 | while (*err == REG_NOERROR && cur_state == NULL); | |
2450 | return cur_state; | |
2451 | } | |
2452 | ||
2453 | /* Helper functions for transit_state. */ | |
2454 | ||
2455 | /* From the node set CUR_NODES, pick up the nodes whose types are | |
2456 | OP_OPEN_SUBEXP and which have corresponding back references in the regular | |
2457 | expression. And register them to use them later for evaluating the | |
005de2e8 | 2458 | corresponding back references. */ |
eb4a14ed LC |
2459 | |
2460 | static reg_errcode_t | |
2461 | internal_function | |
2462 | check_subexp_matching_top (re_match_context_t *mctx, re_node_set *cur_nodes, | |
2463 | Idx str_idx) | |
2464 | { | |
2465 | const re_dfa_t *const dfa = mctx->dfa; | |
2466 | Idx node_idx; | |
2467 | reg_errcode_t err; | |
2468 | ||
2469 | /* TODO: This isn't efficient. | |
2470 | Because there might be more than one nodes whose types are | |
2471 | OP_OPEN_SUBEXP and whose index is SUBEXP_IDX, we must check all | |
2472 | nodes. | |
2473 | E.g. RE: (a){2} */ | |
2474 | for (node_idx = 0; node_idx < cur_nodes->nelem; ++node_idx) | |
2475 | { | |
2476 | Idx node = cur_nodes->elems[node_idx]; | |
2477 | if (dfa->nodes[node].type == OP_OPEN_SUBEXP | |
2478 | && dfa->nodes[node].opr.idx < BITSET_WORD_BITS | |
2479 | && (dfa->used_bkref_map | |
2480 | & ((bitset_word_t) 1 << dfa->nodes[node].opr.idx))) | |
2481 | { | |
2482 | err = match_ctx_add_subtop (mctx, node, str_idx); | |
2483 | if (BE (err != REG_NOERROR, 0)) | |
2484 | return err; | |
2485 | } | |
2486 | } | |
2487 | return REG_NOERROR; | |
2488 | } | |
2489 | ||
2490 | #if 0 | |
2491 | /* Return the next state to which the current state STATE will transit by | |
2492 | accepting the current input byte. */ | |
2493 | ||
2494 | static re_dfastate_t * | |
2495 | transit_state_sb (reg_errcode_t *err, re_match_context_t *mctx, | |
2496 | re_dfastate_t *state) | |
2497 | { | |
2498 | const re_dfa_t *const dfa = mctx->dfa; | |
2499 | re_node_set next_nodes; | |
2500 | re_dfastate_t *next_state; | |
2501 | Idx node_cnt, cur_str_idx = re_string_cur_idx (&mctx->input); | |
2502 | unsigned int context; | |
2503 | ||
2504 | *err = re_node_set_alloc (&next_nodes, state->nodes.nelem + 1); | |
2505 | if (BE (*err != REG_NOERROR, 0)) | |
2506 | return NULL; | |
2507 | for (node_cnt = 0; node_cnt < state->nodes.nelem; ++node_cnt) | |
2508 | { | |
2509 | Idx cur_node = state->nodes.elems[node_cnt]; | |
2510 | if (check_node_accept (mctx, dfa->nodes + cur_node, cur_str_idx)) | |
2511 | { | |
2512 | *err = re_node_set_merge (&next_nodes, | |
2513 | dfa->eclosures + dfa->nexts[cur_node]); | |
2514 | if (BE (*err != REG_NOERROR, 0)) | |
2515 | { | |
2516 | re_node_set_free (&next_nodes); | |
2517 | return NULL; | |
2518 | } | |
2519 | } | |
2520 | } | |
2521 | context = re_string_context_at (&mctx->input, cur_str_idx, mctx->eflags); | |
2522 | next_state = re_acquire_state_context (err, dfa, &next_nodes, context); | |
2523 | /* We don't need to check errors here, since the return value of | |
2524 | this function is next_state and ERR is already set. */ | |
2525 | ||
2526 | re_node_set_free (&next_nodes); | |
2527 | re_string_skip_bytes (&mctx->input, 1); | |
2528 | return next_state; | |
2529 | } | |
2530 | #endif | |
2531 | ||
2532 | #ifdef RE_ENABLE_I18N | |
2533 | static reg_errcode_t | |
2534 | internal_function | |
2535 | transit_state_mb (re_match_context_t *mctx, re_dfastate_t *pstate) | |
2536 | { | |
2537 | const re_dfa_t *const dfa = mctx->dfa; | |
2538 | reg_errcode_t err; | |
2539 | Idx i; | |
2540 | ||
2541 | for (i = 0; i < pstate->nodes.nelem; ++i) | |
2542 | { | |
2543 | re_node_set dest_nodes, *new_nodes; | |
2544 | Idx cur_node_idx = pstate->nodes.elems[i]; | |
2545 | int naccepted; | |
2546 | Idx dest_idx; | |
2547 | unsigned int context; | |
2548 | re_dfastate_t *dest_state; | |
2549 | ||
2550 | if (!dfa->nodes[cur_node_idx].accept_mb) | |
2551 | continue; | |
2552 | ||
2553 | if (dfa->nodes[cur_node_idx].constraint) | |
2554 | { | |
2555 | context = re_string_context_at (&mctx->input, | |
2556 | re_string_cur_idx (&mctx->input), | |
2557 | mctx->eflags); | |
2558 | if (NOT_SATISFY_NEXT_CONSTRAINT (dfa->nodes[cur_node_idx].constraint, | |
2559 | context)) | |
2560 | continue; | |
2561 | } | |
2562 | ||
2563 | /* How many bytes the node can accept? */ | |
2564 | naccepted = check_node_accept_bytes (dfa, cur_node_idx, &mctx->input, | |
2565 | re_string_cur_idx (&mctx->input)); | |
2566 | if (naccepted == 0) | |
2567 | continue; | |
2568 | ||
2569 | /* The node can accepts 'naccepted' bytes. */ | |
2570 | dest_idx = re_string_cur_idx (&mctx->input) + naccepted; | |
2571 | mctx->max_mb_elem_len = ((mctx->max_mb_elem_len < naccepted) ? naccepted | |
2572 | : mctx->max_mb_elem_len); | |
2573 | err = clean_state_log_if_needed (mctx, dest_idx); | |
2574 | if (BE (err != REG_NOERROR, 0)) | |
2575 | return err; | |
2576 | #ifdef DEBUG | |
2577 | assert (dfa->nexts[cur_node_idx] != REG_MISSING); | |
2578 | #endif | |
2579 | new_nodes = dfa->eclosures + dfa->nexts[cur_node_idx]; | |
2580 | ||
2581 | dest_state = mctx->state_log[dest_idx]; | |
2582 | if (dest_state == NULL) | |
2583 | dest_nodes = *new_nodes; | |
2584 | else | |
2585 | { | |
2586 | err = re_node_set_init_union (&dest_nodes, | |
2587 | dest_state->entrance_nodes, new_nodes); | |
2588 | if (BE (err != REG_NOERROR, 0)) | |
2589 | return err; | |
2590 | } | |
2591 | context = re_string_context_at (&mctx->input, dest_idx - 1, | |
2592 | mctx->eflags); | |
2593 | mctx->state_log[dest_idx] | |
2594 | = re_acquire_state_context (&err, dfa, &dest_nodes, context); | |
2595 | if (dest_state != NULL) | |
2596 | re_node_set_free (&dest_nodes); | |
2597 | if (BE (mctx->state_log[dest_idx] == NULL && err != REG_NOERROR, 0)) | |
2598 | return err; | |
2599 | } | |
2600 | return REG_NOERROR; | |
2601 | } | |
2602 | #endif /* RE_ENABLE_I18N */ | |
2603 | ||
2604 | static reg_errcode_t | |
2605 | internal_function | |
2606 | transit_state_bkref (re_match_context_t *mctx, const re_node_set *nodes) | |
2607 | { | |
2608 | const re_dfa_t *const dfa = mctx->dfa; | |
2609 | reg_errcode_t err; | |
2610 | Idx i; | |
2611 | Idx cur_str_idx = re_string_cur_idx (&mctx->input); | |
2612 | ||
2613 | for (i = 0; i < nodes->nelem; ++i) | |
2614 | { | |
2615 | Idx dest_str_idx, prev_nelem, bkc_idx; | |
2616 | Idx node_idx = nodes->elems[i]; | |
2617 | unsigned int context; | |
2618 | const re_token_t *node = dfa->nodes + node_idx; | |
2619 | re_node_set *new_dest_nodes; | |
2620 | ||
2621 | /* Check whether 'node' is a backreference or not. */ | |
2622 | if (node->type != OP_BACK_REF) | |
2623 | continue; | |
2624 | ||
2625 | if (node->constraint) | |
2626 | { | |
2627 | context = re_string_context_at (&mctx->input, cur_str_idx, | |
2628 | mctx->eflags); | |
2629 | if (NOT_SATISFY_NEXT_CONSTRAINT (node->constraint, context)) | |
2630 | continue; | |
2631 | } | |
2632 | ||
2633 | /* 'node' is a backreference. | |
2634 | Check the substring which the substring matched. */ | |
2635 | bkc_idx = mctx->nbkref_ents; | |
2636 | err = get_subexp (mctx, node_idx, cur_str_idx); | |
2637 | if (BE (err != REG_NOERROR, 0)) | |
2638 | goto free_return; | |
2639 | ||
2640 | /* And add the epsilon closures (which is 'new_dest_nodes') of | |
2641 | the backreference to appropriate state_log. */ | |
2642 | #ifdef DEBUG | |
2643 | assert (dfa->nexts[node_idx] != REG_MISSING); | |
2644 | #endif | |
2645 | for (; bkc_idx < mctx->nbkref_ents; ++bkc_idx) | |
2646 | { | |
2647 | Idx subexp_len; | |
2648 | re_dfastate_t *dest_state; | |
2649 | struct re_backref_cache_entry *bkref_ent; | |
2650 | bkref_ent = mctx->bkref_ents + bkc_idx; | |
2651 | if (bkref_ent->node != node_idx || bkref_ent->str_idx != cur_str_idx) | |
2652 | continue; | |
2653 | subexp_len = bkref_ent->subexp_to - bkref_ent->subexp_from; | |
2654 | new_dest_nodes = (subexp_len == 0 | |
2655 | ? dfa->eclosures + dfa->edests[node_idx].elems[0] | |
2656 | : dfa->eclosures + dfa->nexts[node_idx]); | |
2657 | dest_str_idx = (cur_str_idx + bkref_ent->subexp_to | |
2658 | - bkref_ent->subexp_from); | |
2659 | context = re_string_context_at (&mctx->input, dest_str_idx - 1, | |
2660 | mctx->eflags); | |
2661 | dest_state = mctx->state_log[dest_str_idx]; | |
2662 | prev_nelem = ((mctx->state_log[cur_str_idx] == NULL) ? 0 | |
2663 | : mctx->state_log[cur_str_idx]->nodes.nelem); | |
2664 | /* Add 'new_dest_node' to state_log. */ | |
2665 | if (dest_state == NULL) | |
2666 | { | |
2667 | mctx->state_log[dest_str_idx] | |
2668 | = re_acquire_state_context (&err, dfa, new_dest_nodes, | |
2669 | context); | |
2670 | if (BE (mctx->state_log[dest_str_idx] == NULL | |
2671 | && err != REG_NOERROR, 0)) | |
2672 | goto free_return; | |
2673 | } | |
2674 | else | |
2675 | { | |
2676 | re_node_set dest_nodes; | |
2677 | err = re_node_set_init_union (&dest_nodes, | |
2678 | dest_state->entrance_nodes, | |
2679 | new_dest_nodes); | |
2680 | if (BE (err != REG_NOERROR, 0)) | |
2681 | { | |
2682 | re_node_set_free (&dest_nodes); | |
2683 | goto free_return; | |
2684 | } | |
2685 | mctx->state_log[dest_str_idx] | |
2686 | = re_acquire_state_context (&err, dfa, &dest_nodes, context); | |
2687 | re_node_set_free (&dest_nodes); | |
2688 | if (BE (mctx->state_log[dest_str_idx] == NULL | |
2689 | && err != REG_NOERROR, 0)) | |
2690 | goto free_return; | |
2691 | } | |
2692 | /* We need to check recursively if the backreference can epsilon | |
2693 | transit. */ | |
2694 | if (subexp_len == 0 | |
2695 | && mctx->state_log[cur_str_idx]->nodes.nelem > prev_nelem) | |
2696 | { | |
2697 | err = check_subexp_matching_top (mctx, new_dest_nodes, | |
2698 | cur_str_idx); | |
2699 | if (BE (err != REG_NOERROR, 0)) | |
2700 | goto free_return; | |
2701 | err = transit_state_bkref (mctx, new_dest_nodes); | |
2702 | if (BE (err != REG_NOERROR, 0)) | |
2703 | goto free_return; | |
2704 | } | |
2705 | } | |
2706 | } | |
2707 | err = REG_NOERROR; | |
2708 | free_return: | |
2709 | return err; | |
2710 | } | |
2711 | ||
2712 | /* Enumerate all the candidates which the backreference BKREF_NODE can match | |
2713 | at BKREF_STR_IDX, and register them by match_ctx_add_entry(). | |
2714 | Note that we might collect inappropriate candidates here. | |
2715 | However, the cost of checking them strictly here is too high, then we | |
2716 | delay these checking for prune_impossible_nodes(). */ | |
2717 | ||
2718 | static reg_errcode_t | |
2719 | internal_function __attribute_warn_unused_result__ | |
2720 | get_subexp (re_match_context_t *mctx, Idx bkref_node, Idx bkref_str_idx) | |
2721 | { | |
2722 | const re_dfa_t *const dfa = mctx->dfa; | |
2723 | Idx subexp_num, sub_top_idx; | |
2724 | const char *buf = (const char *) re_string_get_buffer (&mctx->input); | |
2725 | /* Return if we have already checked BKREF_NODE at BKREF_STR_IDX. */ | |
2726 | Idx cache_idx = search_cur_bkref_entry (mctx, bkref_str_idx); | |
2727 | if (cache_idx != REG_MISSING) | |
2728 | { | |
2729 | const struct re_backref_cache_entry *entry | |
2730 | = mctx->bkref_ents + cache_idx; | |
2731 | do | |
2732 | if (entry->node == bkref_node) | |
2733 | return REG_NOERROR; /* We already checked it. */ | |
2734 | while (entry++->more); | |
2735 | } | |
2736 | ||
2737 | subexp_num = dfa->nodes[bkref_node].opr.idx; | |
2738 | ||
2739 | /* For each sub expression */ | |
2740 | for (sub_top_idx = 0; sub_top_idx < mctx->nsub_tops; ++sub_top_idx) | |
2741 | { | |
2742 | reg_errcode_t err; | |
2743 | re_sub_match_top_t *sub_top = mctx->sub_tops[sub_top_idx]; | |
2744 | re_sub_match_last_t *sub_last; | |
2745 | Idx sub_last_idx, sl_str, bkref_str_off; | |
2746 | ||
2747 | if (dfa->nodes[sub_top->node].opr.idx != subexp_num) | |
2748 | continue; /* It isn't related. */ | |
2749 | ||
2750 | sl_str = sub_top->str_idx; | |
2751 | bkref_str_off = bkref_str_idx; | |
2752 | /* At first, check the last node of sub expressions we already | |
2753 | evaluated. */ | |
2754 | for (sub_last_idx = 0; sub_last_idx < sub_top->nlasts; ++sub_last_idx) | |
2755 | { | |
2756 | regoff_t sl_str_diff; | |
2757 | sub_last = sub_top->lasts[sub_last_idx]; | |
2758 | sl_str_diff = sub_last->str_idx - sl_str; | |
2759 | /* The matched string by the sub expression match with the substring | |
2760 | at the back reference? */ | |
2761 | if (sl_str_diff > 0) | |
2762 | { | |
2763 | if (BE (bkref_str_off + sl_str_diff > mctx->input.valid_len, 0)) | |
2764 | { | |
2765 | /* Not enough chars for a successful match. */ | |
2766 | if (bkref_str_off + sl_str_diff > mctx->input.len) | |
2767 | break; | |
2768 | ||
2769 | err = clean_state_log_if_needed (mctx, | |
2770 | bkref_str_off | |
2771 | + sl_str_diff); | |
2772 | if (BE (err != REG_NOERROR, 0)) | |
2773 | return err; | |
2774 | buf = (const char *) re_string_get_buffer (&mctx->input); | |
2775 | } | |
2776 | if (memcmp (buf + bkref_str_off, buf + sl_str, sl_str_diff) != 0) | |
2777 | /* We don't need to search this sub expression any more. */ | |
2778 | break; | |
2779 | } | |
2780 | bkref_str_off += sl_str_diff; | |
2781 | sl_str += sl_str_diff; | |
2782 | err = get_subexp_sub (mctx, sub_top, sub_last, bkref_node, | |
2783 | bkref_str_idx); | |
2784 | ||
2785 | /* Reload buf, since the preceding call might have reallocated | |
2786 | the buffer. */ | |
2787 | buf = (const char *) re_string_get_buffer (&mctx->input); | |
2788 | ||
2789 | if (err == REG_NOMATCH) | |
2790 | continue; | |
2791 | if (BE (err != REG_NOERROR, 0)) | |
2792 | return err; | |
2793 | } | |
2794 | ||
2795 | if (sub_last_idx < sub_top->nlasts) | |
2796 | continue; | |
2797 | if (sub_last_idx > 0) | |
2798 | ++sl_str; | |
2799 | /* Then, search for the other last nodes of the sub expression. */ | |
2800 | for (; sl_str <= bkref_str_idx; ++sl_str) | |
2801 | { | |
2802 | Idx cls_node; | |
2803 | regoff_t sl_str_off; | |
2804 | const re_node_set *nodes; | |
2805 | sl_str_off = sl_str - sub_top->str_idx; | |
2806 | /* The matched string by the sub expression match with the substring | |
2807 | at the back reference? */ | |
2808 | if (sl_str_off > 0) | |
2809 | { | |
2810 | if (BE (bkref_str_off >= mctx->input.valid_len, 0)) | |
2811 | { | |
2812 | /* If we are at the end of the input, we cannot match. */ | |
2813 | if (bkref_str_off >= mctx->input.len) | |
2814 | break; | |
2815 | ||
af07e104 | 2816 | err = extend_buffers (mctx, bkref_str_off + 1); |
eb4a14ed LC |
2817 | if (BE (err != REG_NOERROR, 0)) |
2818 | return err; | |
2819 | ||
2820 | buf = (const char *) re_string_get_buffer (&mctx->input); | |
2821 | } | |
2822 | if (buf [bkref_str_off++] != buf[sl_str - 1]) | |
2823 | break; /* We don't need to search this sub expression | |
2824 | any more. */ | |
2825 | } | |
2826 | if (mctx->state_log[sl_str] == NULL) | |
2827 | continue; | |
2828 | /* Does this state have a ')' of the sub expression? */ | |
2829 | nodes = &mctx->state_log[sl_str]->nodes; | |
2830 | cls_node = find_subexp_node (dfa, nodes, subexp_num, | |
2831 | OP_CLOSE_SUBEXP); | |
2832 | if (cls_node == REG_MISSING) | |
2833 | continue; /* No. */ | |
2834 | if (sub_top->path == NULL) | |
2835 | { | |
2836 | sub_top->path = calloc (sizeof (state_array_t), | |
2837 | sl_str - sub_top->str_idx + 1); | |
2838 | if (sub_top->path == NULL) | |
2839 | return REG_ESPACE; | |
2840 | } | |
2841 | /* Can the OP_OPEN_SUBEXP node arrive the OP_CLOSE_SUBEXP node | |
2842 | in the current context? */ | |
2843 | err = check_arrival (mctx, sub_top->path, sub_top->node, | |
2844 | sub_top->str_idx, cls_node, sl_str, | |
2845 | OP_CLOSE_SUBEXP); | |
2846 | if (err == REG_NOMATCH) | |
2847 | continue; | |
2848 | if (BE (err != REG_NOERROR, 0)) | |
2849 | return err; | |
2850 | sub_last = match_ctx_add_sublast (sub_top, cls_node, sl_str); | |
2851 | if (BE (sub_last == NULL, 0)) | |
2852 | return REG_ESPACE; | |
2853 | err = get_subexp_sub (mctx, sub_top, sub_last, bkref_node, | |
2854 | bkref_str_idx); | |
2855 | if (err == REG_NOMATCH) | |
2856 | continue; | |
2857 | } | |
2858 | } | |
2859 | return REG_NOERROR; | |
2860 | } | |
2861 | ||
2862 | /* Helper functions for get_subexp(). */ | |
2863 | ||
2864 | /* Check SUB_LAST can arrive to the back reference BKREF_NODE at BKREF_STR. | |
2865 | If it can arrive, register the sub expression expressed with SUB_TOP | |
2866 | and SUB_LAST. */ | |
2867 | ||
2868 | static reg_errcode_t | |
2869 | internal_function | |
2870 | get_subexp_sub (re_match_context_t *mctx, const re_sub_match_top_t *sub_top, | |
2871 | re_sub_match_last_t *sub_last, Idx bkref_node, Idx bkref_str) | |
2872 | { | |
2873 | reg_errcode_t err; | |
2874 | Idx to_idx; | |
2875 | /* Can the subexpression arrive the back reference? */ | |
2876 | err = check_arrival (mctx, &sub_last->path, sub_last->node, | |
2877 | sub_last->str_idx, bkref_node, bkref_str, | |
2878 | OP_OPEN_SUBEXP); | |
2879 | if (err != REG_NOERROR) | |
2880 | return err; | |
2881 | err = match_ctx_add_entry (mctx, bkref_node, bkref_str, sub_top->str_idx, | |
2882 | sub_last->str_idx); | |
2883 | if (BE (err != REG_NOERROR, 0)) | |
2884 | return err; | |
2885 | to_idx = bkref_str + sub_last->str_idx - sub_top->str_idx; | |
2886 | return clean_state_log_if_needed (mctx, to_idx); | |
2887 | } | |
2888 | ||
2889 | /* Find the first node which is '(' or ')' and whose index is SUBEXP_IDX. | |
2890 | Search '(' if FL_OPEN, or search ')' otherwise. | |
2891 | TODO: This function isn't efficient... | |
2892 | Because there might be more than one nodes whose types are | |
2893 | OP_OPEN_SUBEXP and whose index is SUBEXP_IDX, we must check all | |
2894 | nodes. | |
2895 | E.g. RE: (a){2} */ | |
2896 | ||
2897 | static Idx | |
2898 | internal_function | |
2899 | find_subexp_node (const re_dfa_t *dfa, const re_node_set *nodes, | |
2900 | Idx subexp_idx, int type) | |
2901 | { | |
2902 | Idx cls_idx; | |
2903 | for (cls_idx = 0; cls_idx < nodes->nelem; ++cls_idx) | |
2904 | { | |
2905 | Idx cls_node = nodes->elems[cls_idx]; | |
2906 | const re_token_t *node = dfa->nodes + cls_node; | |
2907 | if (node->type == type | |
2908 | && node->opr.idx == subexp_idx) | |
2909 | return cls_node; | |
2910 | } | |
2911 | return REG_MISSING; | |
2912 | } | |
2913 | ||
2914 | /* Check whether the node TOP_NODE at TOP_STR can arrive to the node | |
2915 | LAST_NODE at LAST_STR. We record the path onto PATH since it will be | |
2916 | heavily reused. | |
2917 | Return REG_NOERROR if it can arrive, or REG_NOMATCH otherwise. */ | |
2918 | ||
2919 | static reg_errcode_t | |
2920 | internal_function __attribute_warn_unused_result__ | |
2921 | check_arrival (re_match_context_t *mctx, state_array_t *path, Idx top_node, | |
2922 | Idx top_str, Idx last_node, Idx last_str, int type) | |
2923 | { | |
2924 | const re_dfa_t *const dfa = mctx->dfa; | |
2925 | reg_errcode_t err = REG_NOERROR; | |
2926 | Idx subexp_num, backup_cur_idx, str_idx, null_cnt; | |
2927 | re_dfastate_t *cur_state = NULL; | |
2928 | re_node_set *cur_nodes, next_nodes; | |
2929 | re_dfastate_t **backup_state_log; | |
2930 | unsigned int context; | |
2931 | ||
2932 | subexp_num = dfa->nodes[top_node].opr.idx; | |
2933 | /* Extend the buffer if we need. */ | |
2934 | if (BE (path->alloc < last_str + mctx->max_mb_elem_len + 1, 0)) | |
2935 | { | |
2936 | re_dfastate_t **new_array; | |
2937 | Idx old_alloc = path->alloc; | |
005de2e8 LC |
2938 | Idx incr_alloc = last_str + mctx->max_mb_elem_len + 1; |
2939 | Idx new_alloc; | |
2940 | if (BE (IDX_MAX - old_alloc < incr_alloc, 0)) | |
2941 | return REG_ESPACE; | |
2942 | new_alloc = old_alloc + incr_alloc; | |
2943 | if (BE (SIZE_MAX / sizeof (re_dfastate_t *) < new_alloc, 0)) | |
eb4a14ed LC |
2944 | return REG_ESPACE; |
2945 | new_array = re_realloc (path->array, re_dfastate_t *, new_alloc); | |
2946 | if (BE (new_array == NULL, 0)) | |
2947 | return REG_ESPACE; | |
2948 | path->array = new_array; | |
2949 | path->alloc = new_alloc; | |
2950 | memset (new_array + old_alloc, '\0', | |
2951 | sizeof (re_dfastate_t *) * (path->alloc - old_alloc)); | |
2952 | } | |
2953 | ||
2954 | str_idx = path->next_idx ? path->next_idx : top_str; | |
2955 | ||
2956 | /* Temporary modify MCTX. */ | |
2957 | backup_state_log = mctx->state_log; | |
2958 | backup_cur_idx = mctx->input.cur_idx; | |
2959 | mctx->state_log = path->array; | |
2960 | mctx->input.cur_idx = str_idx; | |
2961 | ||
2962 | /* Setup initial node set. */ | |
2963 | context = re_string_context_at (&mctx->input, str_idx - 1, mctx->eflags); | |
2964 | if (str_idx == top_str) | |
2965 | { | |
2966 | err = re_node_set_init_1 (&next_nodes, top_node); | |
2967 | if (BE (err != REG_NOERROR, 0)) | |
2968 | return err; | |
2969 | err = check_arrival_expand_ecl (dfa, &next_nodes, subexp_num, type); | |
2970 | if (BE (err != REG_NOERROR, 0)) | |
2971 | { | |
2972 | re_node_set_free (&next_nodes); | |
2973 | return err; | |
2974 | } | |
2975 | } | |
2976 | else | |
2977 | { | |
2978 | cur_state = mctx->state_log[str_idx]; | |
2979 | if (cur_state && cur_state->has_backref) | |
2980 | { | |
2981 | err = re_node_set_init_copy (&next_nodes, &cur_state->nodes); | |
2982 | if (BE (err != REG_NOERROR, 0)) | |
2983 | return err; | |
2984 | } | |
2985 | else | |
2986 | re_node_set_init_empty (&next_nodes); | |
2987 | } | |
2988 | if (str_idx == top_str || (cur_state && cur_state->has_backref)) | |
2989 | { | |
2990 | if (next_nodes.nelem) | |
2991 | { | |
2992 | err = expand_bkref_cache (mctx, &next_nodes, str_idx, | |
2993 | subexp_num, type); | |
2994 | if (BE (err != REG_NOERROR, 0)) | |
2995 | { | |
2996 | re_node_set_free (&next_nodes); | |
2997 | return err; | |
2998 | } | |
2999 | } | |
3000 | cur_state = re_acquire_state_context (&err, dfa, &next_nodes, context); | |
3001 | if (BE (cur_state == NULL && err != REG_NOERROR, 0)) | |
3002 | { | |
3003 | re_node_set_free (&next_nodes); | |
3004 | return err; | |
3005 | } | |
3006 | mctx->state_log[str_idx] = cur_state; | |
3007 | } | |
3008 | ||
3009 | for (null_cnt = 0; str_idx < last_str && null_cnt <= mctx->max_mb_elem_len;) | |
3010 | { | |
3011 | re_node_set_empty (&next_nodes); | |
3012 | if (mctx->state_log[str_idx + 1]) | |
3013 | { | |
3014 | err = re_node_set_merge (&next_nodes, | |
3015 | &mctx->state_log[str_idx + 1]->nodes); | |
3016 | if (BE (err != REG_NOERROR, 0)) | |
3017 | { | |
3018 | re_node_set_free (&next_nodes); | |
3019 | return err; | |
3020 | } | |
3021 | } | |
3022 | if (cur_state) | |
3023 | { | |
3024 | err = check_arrival_add_next_nodes (mctx, str_idx, | |
3025 | &cur_state->non_eps_nodes, | |
3026 | &next_nodes); | |
3027 | if (BE (err != REG_NOERROR, 0)) | |
3028 | { | |
3029 | re_node_set_free (&next_nodes); | |
3030 | return err; | |
3031 | } | |
3032 | } | |
3033 | ++str_idx; | |
3034 | if (next_nodes.nelem) | |
3035 | { | |
3036 | err = check_arrival_expand_ecl (dfa, &next_nodes, subexp_num, type); | |
3037 | if (BE (err != REG_NOERROR, 0)) | |
3038 | { | |
3039 | re_node_set_free (&next_nodes); | |
3040 | return err; | |
3041 | } | |
3042 | err = expand_bkref_cache (mctx, &next_nodes, str_idx, | |
3043 | subexp_num, type); | |
3044 | if (BE (err != REG_NOERROR, 0)) | |
3045 | { | |
3046 | re_node_set_free (&next_nodes); | |
3047 | return err; | |
3048 | } | |
3049 | } | |
3050 | context = re_string_context_at (&mctx->input, str_idx - 1, mctx->eflags); | |
3051 | cur_state = re_acquire_state_context (&err, dfa, &next_nodes, context); | |
3052 | if (BE (cur_state == NULL && err != REG_NOERROR, 0)) | |
3053 | { | |
3054 | re_node_set_free (&next_nodes); | |
3055 | return err; | |
3056 | } | |
3057 | mctx->state_log[str_idx] = cur_state; | |
3058 | null_cnt = cur_state == NULL ? null_cnt + 1 : 0; | |
3059 | } | |
3060 | re_node_set_free (&next_nodes); | |
3061 | cur_nodes = (mctx->state_log[last_str] == NULL ? NULL | |
3062 | : &mctx->state_log[last_str]->nodes); | |
3063 | path->next_idx = str_idx; | |
3064 | ||
3065 | /* Fix MCTX. */ | |
3066 | mctx->state_log = backup_state_log; | |
3067 | mctx->input.cur_idx = backup_cur_idx; | |
3068 | ||
3069 | /* Then check the current node set has the node LAST_NODE. */ | |
3070 | if (cur_nodes != NULL && re_node_set_contains (cur_nodes, last_node)) | |
3071 | return REG_NOERROR; | |
3072 | ||
3073 | return REG_NOMATCH; | |
3074 | } | |
3075 | ||
3076 | /* Helper functions for check_arrival. */ | |
3077 | ||
3078 | /* Calculate the destination nodes of CUR_NODES at STR_IDX, and append them | |
3079 | to NEXT_NODES. | |
3080 | TODO: This function is similar to the functions transit_state*(), | |
3081 | however this function has many additional works. | |
3082 | Can't we unify them? */ | |
3083 | ||
3084 | static reg_errcode_t | |
3085 | internal_function __attribute_warn_unused_result__ | |
3086 | check_arrival_add_next_nodes (re_match_context_t *mctx, Idx str_idx, | |
3087 | re_node_set *cur_nodes, re_node_set *next_nodes) | |
3088 | { | |
3089 | const re_dfa_t *const dfa = mctx->dfa; | |
3090 | bool ok; | |
3091 | Idx cur_idx; | |
3092 | #ifdef RE_ENABLE_I18N | |
3093 | reg_errcode_t err = REG_NOERROR; | |
3094 | #endif | |
3095 | re_node_set union_set; | |
3096 | re_node_set_init_empty (&union_set); | |
3097 | for (cur_idx = 0; cur_idx < cur_nodes->nelem; ++cur_idx) | |
3098 | { | |
3099 | int naccepted = 0; | |
3100 | Idx cur_node = cur_nodes->elems[cur_idx]; | |
3101 | #ifdef DEBUG | |
3102 | re_token_type_t type = dfa->nodes[cur_node].type; | |
3103 | assert (!IS_EPSILON_NODE (type)); | |
3104 | #endif | |
3105 | #ifdef RE_ENABLE_I18N | |
3106 | /* If the node may accept "multi byte". */ | |
3107 | if (dfa->nodes[cur_node].accept_mb) | |
3108 | { | |
3109 | naccepted = check_node_accept_bytes (dfa, cur_node, &mctx->input, | |
3110 | str_idx); | |
3111 | if (naccepted > 1) | |
3112 | { | |
3113 | re_dfastate_t *dest_state; | |
3114 | Idx next_node = dfa->nexts[cur_node]; | |
3115 | Idx next_idx = str_idx + naccepted; | |
3116 | dest_state = mctx->state_log[next_idx]; | |
3117 | re_node_set_empty (&union_set); | |
3118 | if (dest_state) | |
3119 | { | |
3120 | err = re_node_set_merge (&union_set, &dest_state->nodes); | |
3121 | if (BE (err != REG_NOERROR, 0)) | |
3122 | { | |
3123 | re_node_set_free (&union_set); | |
3124 | return err; | |
3125 | } | |
3126 | } | |
3127 | ok = re_node_set_insert (&union_set, next_node); | |
3128 | if (BE (! ok, 0)) | |
3129 | { | |
3130 | re_node_set_free (&union_set); | |
3131 | return REG_ESPACE; | |
3132 | } | |
3133 | mctx->state_log[next_idx] = re_acquire_state (&err, dfa, | |
3134 | &union_set); | |
3135 | if (BE (mctx->state_log[next_idx] == NULL | |
3136 | && err != REG_NOERROR, 0)) | |
3137 | { | |
3138 | re_node_set_free (&union_set); | |
3139 | return err; | |
3140 | } | |
3141 | } | |
3142 | } | |
3143 | #endif /* RE_ENABLE_I18N */ | |
3144 | if (naccepted | |
3145 | || check_node_accept (mctx, dfa->nodes + cur_node, str_idx)) | |
3146 | { | |
3147 | ok = re_node_set_insert (next_nodes, dfa->nexts[cur_node]); | |
3148 | if (BE (! ok, 0)) | |
3149 | { | |
3150 | re_node_set_free (&union_set); | |
3151 | return REG_ESPACE; | |
3152 | } | |
3153 | } | |
3154 | } | |
3155 | re_node_set_free (&union_set); | |
3156 | return REG_NOERROR; | |
3157 | } | |
3158 | ||
3159 | /* For all the nodes in CUR_NODES, add the epsilon closures of them to | |
3160 | CUR_NODES, however exclude the nodes which are: | |
3161 | - inside the sub expression whose number is EX_SUBEXP, if FL_OPEN. | |
3162 | - out of the sub expression whose number is EX_SUBEXP, if !FL_OPEN. | |
3163 | */ | |
3164 | ||
3165 | static reg_errcode_t | |
3166 | internal_function | |
3167 | check_arrival_expand_ecl (const re_dfa_t *dfa, re_node_set *cur_nodes, | |
3168 | Idx ex_subexp, int type) | |
3169 | { | |
3170 | reg_errcode_t err; | |
3171 | Idx idx, outside_node; | |
3172 | re_node_set new_nodes; | |
3173 | #ifdef DEBUG | |
3174 | assert (cur_nodes->nelem); | |
3175 | #endif | |
3176 | err = re_node_set_alloc (&new_nodes, cur_nodes->nelem); | |
3177 | if (BE (err != REG_NOERROR, 0)) | |
3178 | return err; | |
3179 | /* Create a new node set NEW_NODES with the nodes which are epsilon | |
3180 | closures of the node in CUR_NODES. */ | |
3181 | ||
3182 | for (idx = 0; idx < cur_nodes->nelem; ++idx) | |
3183 | { | |
3184 | Idx cur_node = cur_nodes->elems[idx]; | |
3185 | const re_node_set *eclosure = dfa->eclosures + cur_node; | |
3186 | outside_node = find_subexp_node (dfa, eclosure, ex_subexp, type); | |
3187 | if (outside_node == REG_MISSING) | |
3188 | { | |
3189 | /* There are no problematic nodes, just merge them. */ | |
3190 | err = re_node_set_merge (&new_nodes, eclosure); | |
3191 | if (BE (err != REG_NOERROR, 0)) | |
3192 | { | |
3193 | re_node_set_free (&new_nodes); | |
3194 | return err; | |
3195 | } | |
3196 | } | |
3197 | else | |
3198 | { | |
3199 | /* There are problematic nodes, re-calculate incrementally. */ | |
3200 | err = check_arrival_expand_ecl_sub (dfa, &new_nodes, cur_node, | |
3201 | ex_subexp, type); | |
3202 | if (BE (err != REG_NOERROR, 0)) | |
3203 | { | |
3204 | re_node_set_free (&new_nodes); | |
3205 | return err; | |
3206 | } | |
3207 | } | |
3208 | } | |
3209 | re_node_set_free (cur_nodes); | |
3210 | *cur_nodes = new_nodes; | |
3211 | return REG_NOERROR; | |
3212 | } | |
3213 | ||
3214 | /* Helper function for check_arrival_expand_ecl. | |
3215 | Check incrementally the epsilon closure of TARGET, and if it isn't | |
3216 | problematic append it to DST_NODES. */ | |
3217 | ||
3218 | static reg_errcode_t | |
3219 | internal_function __attribute_warn_unused_result__ | |
3220 | check_arrival_expand_ecl_sub (const re_dfa_t *dfa, re_node_set *dst_nodes, | |
3221 | Idx target, Idx ex_subexp, int type) | |
3222 | { | |
3223 | Idx cur_node; | |
3224 | for (cur_node = target; !re_node_set_contains (dst_nodes, cur_node);) | |
3225 | { | |
3226 | bool ok; | |
3227 | ||
3228 | if (dfa->nodes[cur_node].type == type | |
3229 | && dfa->nodes[cur_node].opr.idx == ex_subexp) | |
3230 | { | |
3231 | if (type == OP_CLOSE_SUBEXP) | |
3232 | { | |
3233 | ok = re_node_set_insert (dst_nodes, cur_node); | |
3234 | if (BE (! ok, 0)) | |
3235 | return REG_ESPACE; | |
3236 | } | |
3237 | break; | |
3238 | } | |
3239 | ok = re_node_set_insert (dst_nodes, cur_node); | |
3240 | if (BE (! ok, 0)) | |
3241 | return REG_ESPACE; | |
3242 | if (dfa->edests[cur_node].nelem == 0) | |
3243 | break; | |
3244 | if (dfa->edests[cur_node].nelem == 2) | |
3245 | { | |
3246 | reg_errcode_t err; | |
3247 | err = check_arrival_expand_ecl_sub (dfa, dst_nodes, | |
3248 | dfa->edests[cur_node].elems[1], | |
3249 | ex_subexp, type); | |
3250 | if (BE (err != REG_NOERROR, 0)) | |
3251 | return err; | |
3252 | } | |
3253 | cur_node = dfa->edests[cur_node].elems[0]; | |
3254 | } | |
3255 | return REG_NOERROR; | |
3256 | } | |
3257 | ||
3258 | ||
3259 | /* For all the back references in the current state, calculate the | |
3260 | destination of the back references by the appropriate entry | |
3261 | in MCTX->BKREF_ENTS. */ | |
3262 | ||
3263 | static reg_errcode_t | |
3264 | internal_function __attribute_warn_unused_result__ | |
3265 | expand_bkref_cache (re_match_context_t *mctx, re_node_set *cur_nodes, | |
3266 | Idx cur_str, Idx subexp_num, int type) | |
3267 | { | |
3268 | const re_dfa_t *const dfa = mctx->dfa; | |
3269 | reg_errcode_t err; | |
3270 | Idx cache_idx_start = search_cur_bkref_entry (mctx, cur_str); | |
3271 | struct re_backref_cache_entry *ent; | |
3272 | ||
3273 | if (cache_idx_start == REG_MISSING) | |
3274 | return REG_NOERROR; | |
3275 | ||
3276 | restart: | |
3277 | ent = mctx->bkref_ents + cache_idx_start; | |
3278 | do | |
3279 | { | |
3280 | Idx to_idx, next_node; | |
3281 | ||
3282 | /* Is this entry ENT is appropriate? */ | |
3283 | if (!re_node_set_contains (cur_nodes, ent->node)) | |
3284 | continue; /* No. */ | |
3285 | ||
3286 | to_idx = cur_str + ent->subexp_to - ent->subexp_from; | |
3287 | /* Calculate the destination of the back reference, and append it | |
3288 | to MCTX->STATE_LOG. */ | |
3289 | if (to_idx == cur_str) | |
3290 | { | |
3291 | /* The backreference did epsilon transit, we must re-check all the | |
3292 | node in the current state. */ | |
3293 | re_node_set new_dests; | |
3294 | reg_errcode_t err2, err3; | |
3295 | next_node = dfa->edests[ent->node].elems[0]; | |
3296 | if (re_node_set_contains (cur_nodes, next_node)) | |
3297 | continue; | |
3298 | err = re_node_set_init_1 (&new_dests, next_node); | |
3299 | err2 = check_arrival_expand_ecl (dfa, &new_dests, subexp_num, type); | |
3300 | err3 = re_node_set_merge (cur_nodes, &new_dests); | |
3301 | re_node_set_free (&new_dests); | |
3302 | if (BE (err != REG_NOERROR || err2 != REG_NOERROR | |
3303 | || err3 != REG_NOERROR, 0)) | |
3304 | { | |
3305 | err = (err != REG_NOERROR ? err | |
3306 | : (err2 != REG_NOERROR ? err2 : err3)); | |
3307 | return err; | |
3308 | } | |
3309 | /* TODO: It is still inefficient... */ | |
3310 | goto restart; | |
3311 | } | |
3312 | else | |
3313 | { | |
3314 | re_node_set union_set; | |
3315 | next_node = dfa->nexts[ent->node]; | |
3316 | if (mctx->state_log[to_idx]) | |
3317 | { | |
3318 | bool ok; | |
3319 | if (re_node_set_contains (&mctx->state_log[to_idx]->nodes, | |
3320 | next_node)) | |
3321 | continue; | |
3322 | err = re_node_set_init_copy (&union_set, | |
3323 | &mctx->state_log[to_idx]->nodes); | |
3324 | ok = re_node_set_insert (&union_set, next_node); | |
3325 | if (BE (err != REG_NOERROR || ! ok, 0)) | |
3326 | { | |
3327 | re_node_set_free (&union_set); | |
3328 | err = err != REG_NOERROR ? err : REG_ESPACE; | |
3329 | return err; | |
3330 | } | |
3331 | } | |
3332 | else | |
3333 | { | |
3334 | err = re_node_set_init_1 (&union_set, next_node); | |
3335 | if (BE (err != REG_NOERROR, 0)) | |
3336 | return err; | |
3337 | } | |
3338 | mctx->state_log[to_idx] = re_acquire_state (&err, dfa, &union_set); | |
3339 | re_node_set_free (&union_set); | |
3340 | if (BE (mctx->state_log[to_idx] == NULL | |
3341 | && err != REG_NOERROR, 0)) | |
3342 | return err; | |
3343 | } | |
3344 | } | |
3345 | while (ent++->more); | |
3346 | return REG_NOERROR; | |
3347 | } | |
3348 | ||
3349 | /* Build transition table for the state. | |
3350 | Return true if successful. */ | |
3351 | ||
3352 | static bool | |
3353 | internal_function | |
3354 | build_trtable (const re_dfa_t *dfa, re_dfastate_t *state) | |
3355 | { | |
3356 | reg_errcode_t err; | |
3357 | Idx i, j; | |
3358 | int ch; | |
3359 | bool need_word_trtable = false; | |
3360 | bitset_word_t elem, mask; | |
3361 | bool dests_node_malloced = false; | |
3362 | bool dest_states_malloced = false; | |
3363 | Idx ndests; /* Number of the destination states from 'state'. */ | |
3364 | re_dfastate_t **trtable; | |
3365 | re_dfastate_t **dest_states = NULL, **dest_states_word, **dest_states_nl; | |
3366 | re_node_set follows, *dests_node; | |
3367 | bitset_t *dests_ch; | |
3368 | bitset_t acceptable; | |
3369 | ||
3370 | struct dests_alloc | |
3371 | { | |
3372 | re_node_set dests_node[SBC_MAX]; | |
3373 | bitset_t dests_ch[SBC_MAX]; | |
3374 | } *dests_alloc; | |
3375 | ||
3376 | /* We build DFA states which corresponds to the destination nodes | |
3377 | from 'state'. 'dests_node[i]' represents the nodes which i-th | |
3378 | destination state contains, and 'dests_ch[i]' represents the | |
3379 | characters which i-th destination state accepts. */ | |
3380 | if (__libc_use_alloca (sizeof (struct dests_alloc))) | |
3381 | dests_alloc = (struct dests_alloc *) alloca (sizeof (struct dests_alloc)); | |
3382 | else | |
3383 | { | |
3384 | dests_alloc = re_malloc (struct dests_alloc, 1); | |
3385 | if (BE (dests_alloc == NULL, 0)) | |
3386 | return false; | |
3387 | dests_node_malloced = true; | |
3388 | } | |
3389 | dests_node = dests_alloc->dests_node; | |
3390 | dests_ch = dests_alloc->dests_ch; | |
3391 | ||
005de2e8 | 3392 | /* Initialize transition table. */ |
eb4a14ed LC |
3393 | state->word_trtable = state->trtable = NULL; |
3394 | ||
3395 | /* At first, group all nodes belonging to 'state' into several | |
3396 | destinations. */ | |
3397 | ndests = group_nodes_into_DFAstates (dfa, state, dests_node, dests_ch); | |
3398 | if (BE (! REG_VALID_NONZERO_INDEX (ndests), 0)) | |
3399 | { | |
3400 | if (dests_node_malloced) | |
3401 | free (dests_alloc); | |
005de2e8 | 3402 | /* Return false in case of an error, true otherwise. */ |
eb4a14ed LC |
3403 | if (ndests == 0) |
3404 | { | |
3405 | state->trtable = (re_dfastate_t **) | |
3406 | calloc (sizeof (re_dfastate_t *), SBC_MAX); | |
3407 | if (BE (state->trtable == NULL, 0)) | |
3408 | return false; | |
3409 | return true; | |
3410 | } | |
3411 | return false; | |
3412 | } | |
3413 | ||
3414 | err = re_node_set_alloc (&follows, ndests + 1); | |
3415 | if (BE (err != REG_NOERROR, 0)) | |
3416 | goto out_free; | |
3417 | ||
3418 | /* Avoid arithmetic overflow in size calculation. */ | |
3419 | if (BE ((((SIZE_MAX - (sizeof (re_node_set) + sizeof (bitset_t)) * SBC_MAX) | |
3420 | / (3 * sizeof (re_dfastate_t *))) | |
3421 | < ndests), | |
3422 | 0)) | |
3423 | goto out_free; | |
3424 | ||
3425 | if (__libc_use_alloca ((sizeof (re_node_set) + sizeof (bitset_t)) * SBC_MAX | |
3426 | + ndests * 3 * sizeof (re_dfastate_t *))) | |
3427 | dest_states = (re_dfastate_t **) | |
3428 | alloca (ndests * 3 * sizeof (re_dfastate_t *)); | |
3429 | else | |
3430 | { | |
3431 | dest_states = (re_dfastate_t **) | |
3432 | malloc (ndests * 3 * sizeof (re_dfastate_t *)); | |
3433 | if (BE (dest_states == NULL, 0)) | |
3434 | { | |
3435 | out_free: | |
3436 | if (dest_states_malloced) | |
3437 | free (dest_states); | |
3438 | re_node_set_free (&follows); | |
3439 | for (i = 0; i < ndests; ++i) | |
3440 | re_node_set_free (dests_node + i); | |
3441 | if (dests_node_malloced) | |
3442 | free (dests_alloc); | |
3443 | return false; | |
3444 | } | |
3445 | dest_states_malloced = true; | |
3446 | } | |
3447 | dest_states_word = dest_states + ndests; | |
3448 | dest_states_nl = dest_states_word + ndests; | |
3449 | bitset_empty (acceptable); | |
3450 | ||
3451 | /* Then build the states for all destinations. */ | |
3452 | for (i = 0; i < ndests; ++i) | |
3453 | { | |
3454 | Idx next_node; | |
3455 | re_node_set_empty (&follows); | |
3456 | /* Merge the follows of this destination states. */ | |
3457 | for (j = 0; j < dests_node[i].nelem; ++j) | |
3458 | { | |
3459 | next_node = dfa->nexts[dests_node[i].elems[j]]; | |
3460 | if (next_node != REG_MISSING) | |
3461 | { | |
3462 | err = re_node_set_merge (&follows, dfa->eclosures + next_node); | |
3463 | if (BE (err != REG_NOERROR, 0)) | |
3464 | goto out_free; | |
3465 | } | |
3466 | } | |
3467 | dest_states[i] = re_acquire_state_context (&err, dfa, &follows, 0); | |
3468 | if (BE (dest_states[i] == NULL && err != REG_NOERROR, 0)) | |
3469 | goto out_free; | |
3470 | /* If the new state has context constraint, | |
3471 | build appropriate states for these contexts. */ | |
3472 | if (dest_states[i]->has_constraint) | |
3473 | { | |
3474 | dest_states_word[i] = re_acquire_state_context (&err, dfa, &follows, | |
3475 | CONTEXT_WORD); | |
3476 | if (BE (dest_states_word[i] == NULL && err != REG_NOERROR, 0)) | |
3477 | goto out_free; | |
3478 | ||
3479 | if (dest_states[i] != dest_states_word[i] && dfa->mb_cur_max > 1) | |
3480 | need_word_trtable = true; | |
3481 | ||
3482 | dest_states_nl[i] = re_acquire_state_context (&err, dfa, &follows, | |
3483 | CONTEXT_NEWLINE); | |
3484 | if (BE (dest_states_nl[i] == NULL && err != REG_NOERROR, 0)) | |
3485 | goto out_free; | |
3486 | } | |
3487 | else | |
3488 | { | |
3489 | dest_states_word[i] = dest_states[i]; | |
3490 | dest_states_nl[i] = dest_states[i]; | |
3491 | } | |
3492 | bitset_merge (acceptable, dests_ch[i]); | |
3493 | } | |
3494 | ||
3495 | if (!BE (need_word_trtable, 0)) | |
3496 | { | |
3497 | /* We don't care about whether the following character is a word | |
3498 | character, or we are in a single-byte character set so we can | |
3499 | discern by looking at the character code: allocate a | |
3500 | 256-entry transition table. */ | |
3501 | trtable = state->trtable = | |
3502 | (re_dfastate_t **) calloc (sizeof (re_dfastate_t *), SBC_MAX); | |
3503 | if (BE (trtable == NULL, 0)) | |
3504 | goto out_free; | |
3505 | ||
3506 | /* For all characters ch...: */ | |
3507 | for (i = 0; i < BITSET_WORDS; ++i) | |
3508 | for (ch = i * BITSET_WORD_BITS, elem = acceptable[i], mask = 1; | |
3509 | elem; | |
3510 | mask <<= 1, elem >>= 1, ++ch) | |
3511 | if (BE (elem & 1, 0)) | |
3512 | { | |
3513 | /* There must be exactly one destination which accepts | |
3514 | character ch. See group_nodes_into_DFAstates. */ | |
3515 | for (j = 0; (dests_ch[j][i] & mask) == 0; ++j) | |
3516 | ; | |
3517 | ||
3518 | /* j-th destination accepts the word character ch. */ | |
3519 | if (dfa->word_char[i] & mask) | |
3520 | trtable[ch] = dest_states_word[j]; | |
3521 | else | |
3522 | trtable[ch] = dest_states[j]; | |
3523 | } | |
3524 | } | |
3525 | else | |
3526 | { | |
3527 | /* We care about whether the following character is a word | |
3528 | character, and we are in a multi-byte character set: discern | |
3529 | by looking at the character code: build two 256-entry | |
3530 | transition tables, one starting at trtable[0] and one | |
3531 | starting at trtable[SBC_MAX]. */ | |
3532 | trtable = state->word_trtable = | |
3533 | (re_dfastate_t **) calloc (sizeof (re_dfastate_t *), 2 * SBC_MAX); | |
3534 | if (BE (trtable == NULL, 0)) | |
3535 | goto out_free; | |
3536 | ||
3537 | /* For all characters ch...: */ | |
3538 | for (i = 0; i < BITSET_WORDS; ++i) | |
3539 | for (ch = i * BITSET_WORD_BITS, elem = acceptable[i], mask = 1; | |
3540 | elem; | |
3541 | mask <<= 1, elem >>= 1, ++ch) | |
3542 | if (BE (elem & 1, 0)) | |
3543 | { | |
3544 | /* There must be exactly one destination which accepts | |
3545 | character ch. See group_nodes_into_DFAstates. */ | |
3546 | for (j = 0; (dests_ch[j][i] & mask) == 0; ++j) | |
3547 | ; | |
3548 | ||
3549 | /* j-th destination accepts the word character ch. */ | |
3550 | trtable[ch] = dest_states[j]; | |
3551 | trtable[ch + SBC_MAX] = dest_states_word[j]; | |
3552 | } | |
3553 | } | |
3554 | ||
3555 | /* new line */ | |
3556 | if (bitset_contain (acceptable, NEWLINE_CHAR)) | |
3557 | { | |
3558 | /* The current state accepts newline character. */ | |
3559 | for (j = 0; j < ndests; ++j) | |
3560 | if (bitset_contain (dests_ch[j], NEWLINE_CHAR)) | |
3561 | { | |
3562 | /* k-th destination accepts newline character. */ | |
3563 | trtable[NEWLINE_CHAR] = dest_states_nl[j]; | |
3564 | if (need_word_trtable) | |
3565 | trtable[NEWLINE_CHAR + SBC_MAX] = dest_states_nl[j]; | |
3566 | /* There must be only one destination which accepts | |
3567 | newline. See group_nodes_into_DFAstates. */ | |
3568 | break; | |
3569 | } | |
3570 | } | |
3571 | ||
3572 | if (dest_states_malloced) | |
3573 | free (dest_states); | |
3574 | ||
3575 | re_node_set_free (&follows); | |
3576 | for (i = 0; i < ndests; ++i) | |
3577 | re_node_set_free (dests_node + i); | |
3578 | ||
3579 | if (dests_node_malloced) | |
3580 | free (dests_alloc); | |
3581 | ||
3582 | return true; | |
3583 | } | |
3584 | ||
3585 | /* Group all nodes belonging to STATE into several destinations. | |
3586 | Then for all destinations, set the nodes belonging to the destination | |
3587 | to DESTS_NODE[i] and set the characters accepted by the destination | |
3588 | to DEST_CH[i]. This function return the number of destinations. */ | |
3589 | ||
3590 | static Idx | |
3591 | internal_function | |
3592 | group_nodes_into_DFAstates (const re_dfa_t *dfa, const re_dfastate_t *state, | |
3593 | re_node_set *dests_node, bitset_t *dests_ch) | |
3594 | { | |
3595 | reg_errcode_t err; | |
3596 | bool ok; | |
3597 | Idx i, j, k; | |
3598 | Idx ndests; /* Number of the destinations from 'state'. */ | |
3599 | bitset_t accepts; /* Characters a node can accept. */ | |
3600 | const re_node_set *cur_nodes = &state->nodes; | |
3601 | bitset_empty (accepts); | |
3602 | ndests = 0; | |
3603 | ||
3604 | /* For all the nodes belonging to 'state', */ | |
3605 | for (i = 0; i < cur_nodes->nelem; ++i) | |
3606 | { | |
3607 | re_token_t *node = &dfa->nodes[cur_nodes->elems[i]]; | |
3608 | re_token_type_t type = node->type; | |
3609 | unsigned int constraint = node->constraint; | |
3610 | ||
3611 | /* Enumerate all single byte character this node can accept. */ | |
3612 | if (type == CHARACTER) | |
3613 | bitset_set (accepts, node->opr.c); | |
3614 | else if (type == SIMPLE_BRACKET) | |
3615 | { | |
3616 | bitset_merge (accepts, node->opr.sbcset); | |
3617 | } | |
3618 | else if (type == OP_PERIOD) | |
3619 | { | |
3620 | #ifdef RE_ENABLE_I18N | |
3621 | if (dfa->mb_cur_max > 1) | |
3622 | bitset_merge (accepts, dfa->sb_char); | |
3623 | else | |
3624 | #endif | |
3625 | bitset_set_all (accepts); | |
3626 | if (!(dfa->syntax & RE_DOT_NEWLINE)) | |
3627 | bitset_clear (accepts, '\n'); | |
3628 | if (dfa->syntax & RE_DOT_NOT_NULL) | |
3629 | bitset_clear (accepts, '\0'); | |
3630 | } | |
3631 | #ifdef RE_ENABLE_I18N | |
3632 | else if (type == OP_UTF8_PERIOD) | |
3633 | { | |
3634 | if (ASCII_CHARS % BITSET_WORD_BITS == 0) | |
3635 | memset (accepts, -1, ASCII_CHARS / CHAR_BIT); | |
3636 | else | |
3637 | bitset_merge (accepts, utf8_sb_map); | |
3638 | if (!(dfa->syntax & RE_DOT_NEWLINE)) | |
3639 | bitset_clear (accepts, '\n'); | |
3640 | if (dfa->syntax & RE_DOT_NOT_NULL) | |
3641 | bitset_clear (accepts, '\0'); | |
3642 | } | |
3643 | #endif | |
3644 | else | |
3645 | continue; | |
3646 | ||
3647 | /* Check the 'accepts' and sift the characters which are not | |
3648 | match it the context. */ | |
3649 | if (constraint) | |
3650 | { | |
3651 | if (constraint & NEXT_NEWLINE_CONSTRAINT) | |
3652 | { | |
3653 | bool accepts_newline = bitset_contain (accepts, NEWLINE_CHAR); | |
3654 | bitset_empty (accepts); | |
3655 | if (accepts_newline) | |
3656 | bitset_set (accepts, NEWLINE_CHAR); | |
3657 | else | |
3658 | continue; | |
3659 | } | |
3660 | if (constraint & NEXT_ENDBUF_CONSTRAINT) | |
3661 | { | |
3662 | bitset_empty (accepts); | |
3663 | continue; | |
3664 | } | |
3665 | ||
3666 | if (constraint & NEXT_WORD_CONSTRAINT) | |
3667 | { | |
3668 | bitset_word_t any_set = 0; | |
3669 | if (type == CHARACTER && !node->word_char) | |
3670 | { | |
3671 | bitset_empty (accepts); | |
3672 | continue; | |
3673 | } | |
3674 | #ifdef RE_ENABLE_I18N | |
3675 | if (dfa->mb_cur_max > 1) | |
3676 | for (j = 0; j < BITSET_WORDS; ++j) | |
3677 | any_set |= (accepts[j] &= (dfa->word_char[j] | ~dfa->sb_char[j])); | |
3678 | else | |
3679 | #endif | |
3680 | for (j = 0; j < BITSET_WORDS; ++j) | |
3681 | any_set |= (accepts[j] &= dfa->word_char[j]); | |
3682 | if (!any_set) | |
3683 | continue; | |
3684 | } | |
3685 | if (constraint & NEXT_NOTWORD_CONSTRAINT) | |
3686 | { | |
3687 | bitset_word_t any_set = 0; | |
3688 | if (type == CHARACTER && node->word_char) | |
3689 | { | |
3690 | bitset_empty (accepts); | |
3691 | continue; | |
3692 | } | |
3693 | #ifdef RE_ENABLE_I18N | |
3694 | if (dfa->mb_cur_max > 1) | |
3695 | for (j = 0; j < BITSET_WORDS; ++j) | |
3696 | any_set |= (accepts[j] &= ~(dfa->word_char[j] & dfa->sb_char[j])); | |
3697 | else | |
3698 | #endif | |
3699 | for (j = 0; j < BITSET_WORDS; ++j) | |
3700 | any_set |= (accepts[j] &= ~dfa->word_char[j]); | |
3701 | if (!any_set) | |
3702 | continue; | |
3703 | } | |
3704 | } | |
3705 | ||
3706 | /* Then divide 'accepts' into DFA states, or create a new | |
3707 | state. Above, we make sure that accepts is not empty. */ | |
3708 | for (j = 0; j < ndests; ++j) | |
3709 | { | |
3710 | bitset_t intersec; /* Intersection sets, see below. */ | |
3711 | bitset_t remains; | |
3712 | /* Flags, see below. */ | |
3713 | bitset_word_t has_intersec, not_subset, not_consumed; | |
3714 | ||
3715 | /* Optimization, skip if this state doesn't accept the character. */ | |
3716 | if (type == CHARACTER && !bitset_contain (dests_ch[j], node->opr.c)) | |
3717 | continue; | |
3718 | ||
3719 | /* Enumerate the intersection set of this state and 'accepts'. */ | |
3720 | has_intersec = 0; | |
3721 | for (k = 0; k < BITSET_WORDS; ++k) | |
3722 | has_intersec |= intersec[k] = accepts[k] & dests_ch[j][k]; | |
3723 | /* And skip if the intersection set is empty. */ | |
3724 | if (!has_intersec) | |
3725 | continue; | |
3726 | ||
3727 | /* Then check if this state is a subset of 'accepts'. */ | |
3728 | not_subset = not_consumed = 0; | |
3729 | for (k = 0; k < BITSET_WORDS; ++k) | |
3730 | { | |
3731 | not_subset |= remains[k] = ~accepts[k] & dests_ch[j][k]; | |
3732 | not_consumed |= accepts[k] = accepts[k] & ~dests_ch[j][k]; | |
3733 | } | |
3734 | ||
3735 | /* If this state isn't a subset of 'accepts', create a | |
3736 | new group state, which has the 'remains'. */ | |
3737 | if (not_subset) | |
3738 | { | |
3739 | bitset_copy (dests_ch[ndests], remains); | |
3740 | bitset_copy (dests_ch[j], intersec); | |
3741 | err = re_node_set_init_copy (dests_node + ndests, &dests_node[j]); | |
3742 | if (BE (err != REG_NOERROR, 0)) | |
3743 | goto error_return; | |
3744 | ++ndests; | |
3745 | } | |
3746 | ||
3747 | /* Put the position in the current group. */ | |
3748 | ok = re_node_set_insert (&dests_node[j], cur_nodes->elems[i]); | |
3749 | if (BE (! ok, 0)) | |
3750 | goto error_return; | |
3751 | ||
3752 | /* If all characters are consumed, go to next node. */ | |
3753 | if (!not_consumed) | |
3754 | break; | |
3755 | } | |
3756 | /* Some characters remain, create a new group. */ | |
3757 | if (j == ndests) | |
3758 | { | |
3759 | bitset_copy (dests_ch[ndests], accepts); | |
3760 | err = re_node_set_init_1 (dests_node + ndests, cur_nodes->elems[i]); | |
3761 | if (BE (err != REG_NOERROR, 0)) | |
3762 | goto error_return; | |
3763 | ++ndests; | |
3764 | bitset_empty (accepts); | |
3765 | } | |
3766 | } | |
3767 | return ndests; | |
3768 | error_return: | |
3769 | for (j = 0; j < ndests; ++j) | |
3770 | re_node_set_free (dests_node + j); | |
3771 | return REG_MISSING; | |
3772 | } | |
3773 | ||
3774 | #ifdef RE_ENABLE_I18N | |
3775 | /* Check how many bytes the node 'dfa->nodes[node_idx]' accepts. | |
3776 | Return the number of the bytes the node accepts. | |
3777 | STR_IDX is the current index of the input string. | |
3778 | ||
3779 | This function handles the nodes which can accept one character, or | |
3780 | one collating element like '.', '[a-z]', opposite to the other nodes | |
3781 | can only accept one byte. */ | |
3782 | ||
3783 | static int | |
3784 | internal_function | |
3785 | check_node_accept_bytes (const re_dfa_t *dfa, Idx node_idx, | |
3786 | const re_string_t *input, Idx str_idx) | |
3787 | { | |
3788 | const re_token_t *node = dfa->nodes + node_idx; | |
3789 | int char_len, elem_len; | |
3790 | Idx i; | |
3791 | ||
3792 | if (BE (node->type == OP_UTF8_PERIOD, 0)) | |
3793 | { | |
3794 | unsigned char c = re_string_byte_at (input, str_idx), d; | |
3795 | if (BE (c < 0xc2, 1)) | |
3796 | return 0; | |
3797 | ||
3798 | if (str_idx + 2 > input->len) | |
3799 | return 0; | |
3800 | ||
3801 | d = re_string_byte_at (input, str_idx + 1); | |
3802 | if (c < 0xe0) | |
3803 | return (d < 0x80 || d > 0xbf) ? 0 : 2; | |
3804 | else if (c < 0xf0) | |
3805 | { | |
3806 | char_len = 3; | |
3807 | if (c == 0xe0 && d < 0xa0) | |
3808 | return 0; | |
3809 | } | |
3810 | else if (c < 0xf8) | |
3811 | { | |
3812 | char_len = 4; | |
3813 | if (c == 0xf0 && d < 0x90) | |
3814 | return 0; | |
3815 | } | |
3816 | else if (c < 0xfc) | |
3817 | { | |
3818 | char_len = 5; | |
3819 | if (c == 0xf8 && d < 0x88) | |
3820 | return 0; | |
3821 | } | |
3822 | else if (c < 0xfe) | |
3823 | { | |
3824 | char_len = 6; | |
3825 | if (c == 0xfc && d < 0x84) | |
3826 | return 0; | |
3827 | } | |
3828 | else | |
3829 | return 0; | |
3830 | ||
3831 | if (str_idx + char_len > input->len) | |
3832 | return 0; | |
3833 | ||
3834 | for (i = 1; i < char_len; ++i) | |
3835 | { | |
3836 | d = re_string_byte_at (input, str_idx + i); | |
3837 | if (d < 0x80 || d > 0xbf) | |
3838 | return 0; | |
3839 | } | |
3840 | return char_len; | |
3841 | } | |
3842 | ||
3843 | char_len = re_string_char_size_at (input, str_idx); | |
3844 | if (node->type == OP_PERIOD) | |
3845 | { | |
3846 | if (char_len <= 1) | |
3847 | return 0; | |
3848 | /* FIXME: I don't think this if is needed, as both '\n' | |
3849 | and '\0' are char_len == 1. */ | |
3850 | /* '.' accepts any one character except the following two cases. */ | |
3851 | if ((!(dfa->syntax & RE_DOT_NEWLINE) && | |
3852 | re_string_byte_at (input, str_idx) == '\n') || | |
3853 | ((dfa->syntax & RE_DOT_NOT_NULL) && | |
3854 | re_string_byte_at (input, str_idx) == '\0')) | |
3855 | return 0; | |
3856 | return char_len; | |
3857 | } | |
3858 | ||
3859 | elem_len = re_string_elem_size_at (input, str_idx); | |
3860 | if ((elem_len <= 1 && char_len <= 1) || char_len == 0) | |
3861 | return 0; | |
3862 | ||
3863 | if (node->type == COMPLEX_BRACKET) | |
3864 | { | |
3865 | const re_charset_t *cset = node->opr.mbcset; | |
3866 | # ifdef _LIBC | |
3867 | const unsigned char *pin | |
3868 | = ((const unsigned char *) re_string_get_buffer (input) + str_idx); | |
3869 | Idx j; | |
3870 | uint32_t nrules; | |
3871 | # endif /* _LIBC */ | |
3872 | int match_len = 0; | |
3873 | wchar_t wc = ((cset->nranges || cset->nchar_classes || cset->nmbchars) | |
3874 | ? re_string_wchar_at (input, str_idx) : 0); | |
3875 | ||
3876 | /* match with multibyte character? */ | |
3877 | for (i = 0; i < cset->nmbchars; ++i) | |
3878 | if (wc == cset->mbchars[i]) | |
3879 | { | |
3880 | match_len = char_len; | |
3881 | goto check_node_accept_bytes_match; | |
3882 | } | |
3883 | /* match with character_class? */ | |
3884 | for (i = 0; i < cset->nchar_classes; ++i) | |
3885 | { | |
3886 | wctype_t wt = cset->char_classes[i]; | |
3887 | if (__iswctype (wc, wt)) | |
3888 | { | |
3889 | match_len = char_len; | |
3890 | goto check_node_accept_bytes_match; | |
3891 | } | |
3892 | } | |
3893 | ||
3894 | # ifdef _LIBC | |
3895 | nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES); | |
3896 | if (nrules != 0) | |
3897 | { | |
3898 | unsigned int in_collseq = 0; | |
3899 | const int32_t *table, *indirect; | |
3900 | const unsigned char *weights, *extra; | |
3901 | const char *collseqwc; | |
eb4a14ed LC |
3902 | /* This #include defines a local function! */ |
3903 | # include <locale/weight.h> | |
3904 | ||
3905 | /* match with collating_symbol? */ | |
3906 | if (cset->ncoll_syms) | |
3907 | extra = (const unsigned char *) | |
3908 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB); | |
3909 | for (i = 0; i < cset->ncoll_syms; ++i) | |
3910 | { | |
3911 | const unsigned char *coll_sym = extra + cset->coll_syms[i]; | |
3912 | /* Compare the length of input collating element and | |
3913 | the length of current collating element. */ | |
3914 | if (*coll_sym != elem_len) | |
3915 | continue; | |
3916 | /* Compare each bytes. */ | |
3917 | for (j = 0; j < *coll_sym; j++) | |
3918 | if (pin[j] != coll_sym[1 + j]) | |
3919 | break; | |
3920 | if (j == *coll_sym) | |
3921 | { | |
3922 | /* Match if every bytes is equal. */ | |
3923 | match_len = j; | |
3924 | goto check_node_accept_bytes_match; | |
3925 | } | |
3926 | } | |
3927 | ||
3928 | if (cset->nranges) | |
3929 | { | |
3930 | if (elem_len <= char_len) | |
3931 | { | |
3932 | collseqwc = _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQWC); | |
3933 | in_collseq = __collseq_table_lookup (collseqwc, wc); | |
3934 | } | |
3935 | else | |
3936 | in_collseq = find_collation_sequence_value (pin, elem_len); | |
3937 | } | |
3938 | /* match with range expression? */ | |
af07e104 | 3939 | /* FIXME: Implement rational ranges here, too. */ |
eb4a14ed LC |
3940 | for (i = 0; i < cset->nranges; ++i) |
3941 | if (cset->range_starts[i] <= in_collseq | |
3942 | && in_collseq <= cset->range_ends[i]) | |
3943 | { | |
3944 | match_len = elem_len; | |
3945 | goto check_node_accept_bytes_match; | |
3946 | } | |
3947 | ||
3948 | /* match with equivalence_class? */ | |
3949 | if (cset->nequiv_classes) | |
3950 | { | |
3951 | const unsigned char *cp = pin; | |
3952 | table = (const int32_t *) | |
3953 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB); | |
3954 | weights = (const unsigned char *) | |
3955 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_WEIGHTMB); | |
3956 | extra = (const unsigned char *) | |
3957 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB); | |
3958 | indirect = (const int32_t *) | |
3959 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_INDIRECTMB); | |
005de2e8 | 3960 | int32_t idx = findidx (&cp, elem_len); |
eb4a14ed LC |
3961 | if (idx > 0) |
3962 | for (i = 0; i < cset->nequiv_classes; ++i) | |
3963 | { | |
3964 | int32_t equiv_class_idx = cset->equiv_classes[i]; | |
3965 | size_t weight_len = weights[idx & 0xffffff]; | |
3966 | if (weight_len == weights[equiv_class_idx & 0xffffff] | |
3967 | && (idx >> 24) == (equiv_class_idx >> 24)) | |
3968 | { | |
3969 | Idx cnt = 0; | |
3970 | ||
3971 | idx &= 0xffffff; | |
3972 | equiv_class_idx &= 0xffffff; | |
3973 | ||
3974 | while (cnt <= weight_len | |
3975 | && (weights[equiv_class_idx + 1 + cnt] | |
3976 | == weights[idx + 1 + cnt])) | |
3977 | ++cnt; | |
3978 | if (cnt > weight_len) | |
3979 | { | |
3980 | match_len = elem_len; | |
3981 | goto check_node_accept_bytes_match; | |
3982 | } | |
3983 | } | |
3984 | } | |
3985 | } | |
3986 | } | |
3987 | else | |
3988 | # endif /* _LIBC */ | |
3989 | { | |
3990 | /* match with range expression? */ | |
eb4a14ed LC |
3991 | for (i = 0; i < cset->nranges; ++i) |
3992 | { | |
af07e104 | 3993 | if (cset->range_starts[i] <= wc && wc <= cset->range_ends[i]) |
eb4a14ed LC |
3994 | { |
3995 | match_len = char_len; | |
3996 | goto check_node_accept_bytes_match; | |
3997 | } | |
3998 | } | |
3999 | } | |
4000 | check_node_accept_bytes_match: | |
4001 | if (!cset->non_match) | |
4002 | return match_len; | |
4003 | else | |
4004 | { | |
4005 | if (match_len > 0) | |
4006 | return 0; | |
4007 | else | |
4008 | return (elem_len > char_len) ? elem_len : char_len; | |
4009 | } | |
4010 | } | |
4011 | return 0; | |
4012 | } | |
4013 | ||
4014 | # ifdef _LIBC | |
4015 | static unsigned int | |
4016 | internal_function | |
4017 | find_collation_sequence_value (const unsigned char *mbs, size_t mbs_len) | |
4018 | { | |
4019 | uint32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES); | |
4020 | if (nrules == 0) | |
4021 | { | |
4022 | if (mbs_len == 1) | |
4023 | { | |
4024 | /* No valid character. Match it as a single byte character. */ | |
4025 | const unsigned char *collseq = (const unsigned char *) | |
4026 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQMB); | |
4027 | return collseq[mbs[0]]; | |
4028 | } | |
4029 | return UINT_MAX; | |
4030 | } | |
4031 | else | |
4032 | { | |
4033 | int32_t idx; | |
4034 | const unsigned char *extra = (const unsigned char *) | |
4035 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB); | |
4036 | int32_t extrasize = (const unsigned char *) | |
4037 | _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB + 1) - extra; | |
4038 | ||
4039 | for (idx = 0; idx < extrasize;) | |
4040 | { | |
4041 | int mbs_cnt; | |
4042 | bool found = false; | |
4043 | int32_t elem_mbs_len; | |
4044 | /* Skip the name of collating element name. */ | |
4045 | idx = idx + extra[idx] + 1; | |
4046 | elem_mbs_len = extra[idx++]; | |
4047 | if (mbs_len == elem_mbs_len) | |
4048 | { | |
4049 | for (mbs_cnt = 0; mbs_cnt < elem_mbs_len; ++mbs_cnt) | |
4050 | if (extra[idx + mbs_cnt] != mbs[mbs_cnt]) | |
4051 | break; | |
4052 | if (mbs_cnt == elem_mbs_len) | |
4053 | /* Found the entry. */ | |
4054 | found = true; | |
4055 | } | |
4056 | /* Skip the byte sequence of the collating element. */ | |
4057 | idx += elem_mbs_len; | |
4058 | /* Adjust for the alignment. */ | |
4059 | idx = (idx + 3) & ~3; | |
4060 | /* Skip the collation sequence value. */ | |
4061 | idx += sizeof (uint32_t); | |
4062 | /* Skip the wide char sequence of the collating element. */ | |
005de2e8 | 4063 | idx = idx + sizeof (uint32_t) * (*(int32_t *) (extra + idx) + 1); |
eb4a14ed LC |
4064 | /* If we found the entry, return the sequence value. */ |
4065 | if (found) | |
4066 | return *(uint32_t *) (extra + idx); | |
4067 | /* Skip the collation sequence value. */ | |
4068 | idx += sizeof (uint32_t); | |
4069 | } | |
4070 | return UINT_MAX; | |
4071 | } | |
4072 | } | |
4073 | # endif /* _LIBC */ | |
4074 | #endif /* RE_ENABLE_I18N */ | |
4075 | ||
4076 | /* Check whether the node accepts the byte which is IDX-th | |
4077 | byte of the INPUT. */ | |
4078 | ||
4079 | static bool | |
4080 | internal_function | |
4081 | check_node_accept (const re_match_context_t *mctx, const re_token_t *node, | |
4082 | Idx idx) | |
4083 | { | |
4084 | unsigned char ch; | |
4085 | ch = re_string_byte_at (&mctx->input, idx); | |
4086 | switch (node->type) | |
4087 | { | |
4088 | case CHARACTER: | |
4089 | if (node->opr.c != ch) | |
4090 | return false; | |
4091 | break; | |
4092 | ||
4093 | case SIMPLE_BRACKET: | |
4094 | if (!bitset_contain (node->opr.sbcset, ch)) | |
4095 | return false; | |
4096 | break; | |
4097 | ||
4098 | #ifdef RE_ENABLE_I18N | |
4099 | case OP_UTF8_PERIOD: | |
4100 | if (ch >= ASCII_CHARS) | |
4101 | return false; | |
4102 | /* FALLTHROUGH */ | |
4103 | #endif | |
4104 | case OP_PERIOD: | |
4105 | if ((ch == '\n' && !(mctx->dfa->syntax & RE_DOT_NEWLINE)) | |
4106 | || (ch == '\0' && (mctx->dfa->syntax & RE_DOT_NOT_NULL))) | |
4107 | return false; | |
4108 | break; | |
4109 | ||
4110 | default: | |
4111 | return false; | |
4112 | } | |
4113 | ||
4114 | if (node->constraint) | |
4115 | { | |
4116 | /* The node has constraints. Check whether the current context | |
4117 | satisfies the constraints. */ | |
4118 | unsigned int context = re_string_context_at (&mctx->input, idx, | |
4119 | mctx->eflags); | |
4120 | if (NOT_SATISFY_NEXT_CONSTRAINT (node->constraint, context)) | |
4121 | return false; | |
4122 | } | |
4123 | ||
4124 | return true; | |
4125 | } | |
4126 | ||
4127 | /* Extend the buffers, if the buffers have run out. */ | |
4128 | ||
4129 | static reg_errcode_t | |
4130 | internal_function __attribute_warn_unused_result__ | |
af07e104 | 4131 | extend_buffers (re_match_context_t *mctx, int min_len) |
eb4a14ed LC |
4132 | { |
4133 | reg_errcode_t ret; | |
4134 | re_string_t *pstr = &mctx->input; | |
4135 | ||
4136 | /* Avoid overflow. */ | |
005de2e8 LC |
4137 | if (BE (MIN (IDX_MAX, SIZE_MAX / sizeof (re_dfastate_t *)) / 2 |
4138 | <= pstr->bufs_len, 0)) | |
eb4a14ed LC |
4139 | return REG_ESPACE; |
4140 | ||
af07e104 AW |
4141 | /* Double the lengths of the buffers, but allocate at least MIN_LEN. */ |
4142 | ret = re_string_realloc_buffers (pstr, | |
4143 | MAX (min_len, | |
4144 | MIN (pstr->len, pstr->bufs_len * 2))); | |
eb4a14ed LC |
4145 | if (BE (ret != REG_NOERROR, 0)) |
4146 | return ret; | |
4147 | ||
4148 | if (mctx->state_log != NULL) | |
4149 | { | |
4150 | /* And double the length of state_log. */ | |
4151 | /* XXX We have no indication of the size of this buffer. If this | |
4152 | allocation fail we have no indication that the state_log array | |
4153 | does not have the right size. */ | |
4154 | re_dfastate_t **new_array = re_realloc (mctx->state_log, re_dfastate_t *, | |
4155 | pstr->bufs_len + 1); | |
4156 | if (BE (new_array == NULL, 0)) | |
4157 | return REG_ESPACE; | |
4158 | mctx->state_log = new_array; | |
4159 | } | |
4160 | ||
4161 | /* Then reconstruct the buffers. */ | |
4162 | if (pstr->icase) | |
4163 | { | |
4164 | #ifdef RE_ENABLE_I18N | |
4165 | if (pstr->mb_cur_max > 1) | |
4166 | { | |
4167 | ret = build_wcs_upper_buffer (pstr); | |
4168 | if (BE (ret != REG_NOERROR, 0)) | |
4169 | return ret; | |
4170 | } | |
4171 | else | |
4172 | #endif /* RE_ENABLE_I18N */ | |
4173 | build_upper_buffer (pstr); | |
4174 | } | |
4175 | else | |
4176 | { | |
4177 | #ifdef RE_ENABLE_I18N | |
4178 | if (pstr->mb_cur_max > 1) | |
4179 | build_wcs_buffer (pstr); | |
4180 | else | |
4181 | #endif /* RE_ENABLE_I18N */ | |
4182 | { | |
4183 | if (pstr->trans != NULL) | |
4184 | re_string_translate_buffer (pstr); | |
4185 | } | |
4186 | } | |
4187 | return REG_NOERROR; | |
4188 | } | |
4189 | ||
4190 | \f | |
4191 | /* Functions for matching context. */ | |
4192 | ||
4193 | /* Initialize MCTX. */ | |
4194 | ||
4195 | static reg_errcode_t | |
4196 | internal_function __attribute_warn_unused_result__ | |
4197 | match_ctx_init (re_match_context_t *mctx, int eflags, Idx n) | |
4198 | { | |
4199 | mctx->eflags = eflags; | |
4200 | mctx->match_last = REG_MISSING; | |
4201 | if (n > 0) | |
4202 | { | |
4203 | /* Avoid overflow. */ | |
4204 | size_t max_object_size = | |
4205 | MAX (sizeof (struct re_backref_cache_entry), | |
4206 | sizeof (re_sub_match_top_t *)); | |
005de2e8 | 4207 | if (BE (MIN (IDX_MAX, SIZE_MAX / max_object_size) < n, 0)) |
eb4a14ed LC |
4208 | return REG_ESPACE; |
4209 | ||
4210 | mctx->bkref_ents = re_malloc (struct re_backref_cache_entry, n); | |
4211 | mctx->sub_tops = re_malloc (re_sub_match_top_t *, n); | |
4212 | if (BE (mctx->bkref_ents == NULL || mctx->sub_tops == NULL, 0)) | |
4213 | return REG_ESPACE; | |
4214 | } | |
4215 | /* Already zero-ed by the caller. | |
4216 | else | |
4217 | mctx->bkref_ents = NULL; | |
4218 | mctx->nbkref_ents = 0; | |
4219 | mctx->nsub_tops = 0; */ | |
4220 | mctx->abkref_ents = n; | |
4221 | mctx->max_mb_elem_len = 1; | |
4222 | mctx->asub_tops = n; | |
4223 | return REG_NOERROR; | |
4224 | } | |
4225 | ||
4226 | /* Clean the entries which depend on the current input in MCTX. | |
4227 | This function must be invoked when the matcher changes the start index | |
4228 | of the input, or changes the input string. */ | |
4229 | ||
4230 | static void | |
4231 | internal_function | |
4232 | match_ctx_clean (re_match_context_t *mctx) | |
4233 | { | |
4234 | Idx st_idx; | |
4235 | for (st_idx = 0; st_idx < mctx->nsub_tops; ++st_idx) | |
4236 | { | |
4237 | Idx sl_idx; | |
4238 | re_sub_match_top_t *top = mctx->sub_tops[st_idx]; | |
4239 | for (sl_idx = 0; sl_idx < top->nlasts; ++sl_idx) | |
4240 | { | |
4241 | re_sub_match_last_t *last = top->lasts[sl_idx]; | |
4242 | re_free (last->path.array); | |
4243 | re_free (last); | |
4244 | } | |
4245 | re_free (top->lasts); | |
4246 | if (top->path) | |
4247 | { | |
4248 | re_free (top->path->array); | |
4249 | re_free (top->path); | |
4250 | } | |
4251 | free (top); | |
4252 | } | |
4253 | ||
4254 | mctx->nsub_tops = 0; | |
4255 | mctx->nbkref_ents = 0; | |
4256 | } | |
4257 | ||
4258 | /* Free all the memory associated with MCTX. */ | |
4259 | ||
4260 | static void | |
4261 | internal_function | |
4262 | match_ctx_free (re_match_context_t *mctx) | |
4263 | { | |
4264 | /* First, free all the memory associated with MCTX->SUB_TOPS. */ | |
4265 | match_ctx_clean (mctx); | |
4266 | re_free (mctx->sub_tops); | |
4267 | re_free (mctx->bkref_ents); | |
4268 | } | |
4269 | ||
4270 | /* Add a new backreference entry to MCTX. | |
4271 | Note that we assume that caller never call this function with duplicate | |
4272 | entry, and call with STR_IDX which isn't smaller than any existing entry. | |
4273 | */ | |
4274 | ||
4275 | static reg_errcode_t | |
4276 | internal_function __attribute_warn_unused_result__ | |
4277 | match_ctx_add_entry (re_match_context_t *mctx, Idx node, Idx str_idx, Idx from, | |
4278 | Idx to) | |
4279 | { | |
4280 | if (mctx->nbkref_ents >= mctx->abkref_ents) | |
4281 | { | |
4282 | struct re_backref_cache_entry* new_entry; | |
4283 | new_entry = re_realloc (mctx->bkref_ents, struct re_backref_cache_entry, | |
4284 | mctx->abkref_ents * 2); | |
4285 | if (BE (new_entry == NULL, 0)) | |
4286 | { | |
4287 | re_free (mctx->bkref_ents); | |
4288 | return REG_ESPACE; | |
4289 | } | |
4290 | mctx->bkref_ents = new_entry; | |
4291 | memset (mctx->bkref_ents + mctx->nbkref_ents, '\0', | |
4292 | sizeof (struct re_backref_cache_entry) * mctx->abkref_ents); | |
4293 | mctx->abkref_ents *= 2; | |
4294 | } | |
4295 | if (mctx->nbkref_ents > 0 | |
4296 | && mctx->bkref_ents[mctx->nbkref_ents - 1].str_idx == str_idx) | |
4297 | mctx->bkref_ents[mctx->nbkref_ents - 1].more = 1; | |
4298 | ||
4299 | mctx->bkref_ents[mctx->nbkref_ents].node = node; | |
4300 | mctx->bkref_ents[mctx->nbkref_ents].str_idx = str_idx; | |
4301 | mctx->bkref_ents[mctx->nbkref_ents].subexp_from = from; | |
4302 | mctx->bkref_ents[mctx->nbkref_ents].subexp_to = to; | |
4303 | ||
4304 | /* This is a cache that saves negative results of check_dst_limits_calc_pos. | |
4305 | If bit N is clear, means that this entry won't epsilon-transition to | |
4306 | an OP_OPEN_SUBEXP or OP_CLOSE_SUBEXP for the N+1-th subexpression. If | |
4307 | it is set, check_dst_limits_calc_pos_1 will recurse and try to find one | |
4308 | such node. | |
4309 | ||
4310 | A backreference does not epsilon-transition unless it is empty, so set | |
4311 | to all zeros if FROM != TO. */ | |
4312 | mctx->bkref_ents[mctx->nbkref_ents].eps_reachable_subexps_map | |
4313 | = (from == to ? -1 : 0); | |
4314 | ||
4315 | mctx->bkref_ents[mctx->nbkref_ents++].more = 0; | |
4316 | if (mctx->max_mb_elem_len < to - from) | |
4317 | mctx->max_mb_elem_len = to - from; | |
4318 | return REG_NOERROR; | |
4319 | } | |
4320 | ||
4321 | /* Return the first entry with the same str_idx, or REG_MISSING if none is | |
4322 | found. Note that MCTX->BKREF_ENTS is already sorted by MCTX->STR_IDX. */ | |
4323 | ||
4324 | static Idx | |
4325 | internal_function | |
4326 | search_cur_bkref_entry (const re_match_context_t *mctx, Idx str_idx) | |
4327 | { | |
4328 | Idx left, right, mid, last; | |
4329 | last = right = mctx->nbkref_ents; | |
4330 | for (left = 0; left < right;) | |
4331 | { | |
4332 | mid = (left + right) / 2; | |
4333 | if (mctx->bkref_ents[mid].str_idx < str_idx) | |
4334 | left = mid + 1; | |
4335 | else | |
4336 | right = mid; | |
4337 | } | |
4338 | if (left < last && mctx->bkref_ents[left].str_idx == str_idx) | |
4339 | return left; | |
4340 | else | |
4341 | return REG_MISSING; | |
4342 | } | |
4343 | ||
4344 | /* Register the node NODE, whose type is OP_OPEN_SUBEXP, and which matches | |
4345 | at STR_IDX. */ | |
4346 | ||
4347 | static reg_errcode_t | |
4348 | internal_function __attribute_warn_unused_result__ | |
4349 | match_ctx_add_subtop (re_match_context_t *mctx, Idx node, Idx str_idx) | |
4350 | { | |
4351 | #ifdef DEBUG | |
4352 | assert (mctx->sub_tops != NULL); | |
4353 | assert (mctx->asub_tops > 0); | |
4354 | #endif | |
4355 | if (BE (mctx->nsub_tops == mctx->asub_tops, 0)) | |
4356 | { | |
4357 | Idx new_asub_tops = mctx->asub_tops * 2; | |
4358 | re_sub_match_top_t **new_array = re_realloc (mctx->sub_tops, | |
4359 | re_sub_match_top_t *, | |
4360 | new_asub_tops); | |
4361 | if (BE (new_array == NULL, 0)) | |
4362 | return REG_ESPACE; | |
4363 | mctx->sub_tops = new_array; | |
4364 | mctx->asub_tops = new_asub_tops; | |
4365 | } | |
4366 | mctx->sub_tops[mctx->nsub_tops] = calloc (1, sizeof (re_sub_match_top_t)); | |
4367 | if (BE (mctx->sub_tops[mctx->nsub_tops] == NULL, 0)) | |
4368 | return REG_ESPACE; | |
4369 | mctx->sub_tops[mctx->nsub_tops]->node = node; | |
4370 | mctx->sub_tops[mctx->nsub_tops++]->str_idx = str_idx; | |
4371 | return REG_NOERROR; | |
4372 | } | |
4373 | ||
4374 | /* Register the node NODE, whose type is OP_CLOSE_SUBEXP, and which matches | |
4375 | at STR_IDX, whose corresponding OP_OPEN_SUBEXP is SUB_TOP. */ | |
4376 | ||
4377 | static re_sub_match_last_t * | |
4378 | internal_function | |
4379 | match_ctx_add_sublast (re_sub_match_top_t *subtop, Idx node, Idx str_idx) | |
4380 | { | |
4381 | re_sub_match_last_t *new_entry; | |
4382 | if (BE (subtop->nlasts == subtop->alasts, 0)) | |
4383 | { | |
4384 | Idx new_alasts = 2 * subtop->alasts + 1; | |
4385 | re_sub_match_last_t **new_array = re_realloc (subtop->lasts, | |
4386 | re_sub_match_last_t *, | |
4387 | new_alasts); | |
4388 | if (BE (new_array == NULL, 0)) | |
4389 | return NULL; | |
4390 | subtop->lasts = new_array; | |
4391 | subtop->alasts = new_alasts; | |
4392 | } | |
4393 | new_entry = calloc (1, sizeof (re_sub_match_last_t)); | |
4394 | if (BE (new_entry != NULL, 1)) | |
4395 | { | |
4396 | subtop->lasts[subtop->nlasts] = new_entry; | |
4397 | new_entry->node = node; | |
4398 | new_entry->str_idx = str_idx; | |
4399 | ++subtop->nlasts; | |
4400 | } | |
4401 | return new_entry; | |
4402 | } | |
4403 | ||
4404 | static void | |
4405 | internal_function | |
4406 | sift_ctx_init (re_sift_context_t *sctx, re_dfastate_t **sifted_sts, | |
4407 | re_dfastate_t **limited_sts, Idx last_node, Idx last_str_idx) | |
4408 | { | |
4409 | sctx->sifted_states = sifted_sts; | |
4410 | sctx->limited_states = limited_sts; | |
4411 | sctx->last_node = last_node; | |
4412 | sctx->last_str_idx = last_str_idx; | |
4413 | re_node_set_init_empty (&sctx->limits); | |
4414 | } |