posix/regex_internal.h

   1 /* Extended regular expression matching and search library.
   2    Copyright (C) 2002-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
   5
   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.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  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    <https://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _REGEX_INTERNAL_H
  21 #define _REGEX_INTERNAL_H 1
  22
  23 #include <ctype.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include <langinfo.h>
  29 #include <locale.h>
  30 #include <wchar.h>
  31 #include <wctype.h>
  32 #include <stdbool.h>
  33 #include <stdint.h>
  34
  35 #ifndef _LIBC
  36 # include <dynarray.h>
  37 #endif
  38
  39 #include <intprops.h>
  40 #include <verify.h>
  41
  42 #if defined DEBUG && DEBUG != 0
  43 # include <assert.h>
  44 # define DEBUG_ASSERT(x) assert (x)
  45 #else
  46 # define DEBUG_ASSERT(x) assume (x)
  47 #endif
  48
  49 #ifdef _LIBC
  50 # include <libc-lock.h>
  51 # define lock_define(name) __libc_lock_define (, name)
  52 # define lock_init(lock) (__libc_lock_init (lock), 0)
  53 # define lock_fini(lock) ((void) 0)
  54 # define lock_lock(lock) __libc_lock_lock (lock)
  55 # define lock_unlock(lock) __libc_lock_unlock (lock)
  56 #elif defined GNULIB_LOCK && !defined GNULIB_REGEX_SINGLE_THREAD
  57 # include "glthread/lock.h"
  58 # define lock_define(name) gl_lock_define (, name)
  59 # define lock_init(lock) glthread_lock_init (&(lock))
  60 # define lock_fini(lock) glthread_lock_destroy (&(lock))
  61 # define lock_lock(lock) glthread_lock_lock (&(lock))
  62 # define lock_unlock(lock) glthread_lock_unlock (&(lock))
  63 #elif defined GNULIB_PTHREAD && !defined GNULIB_REGEX_SINGLE_THREAD
  64 # include <pthread.h>
  65 # define lock_define(name) pthread_mutex_t name;
  66 # define lock_init(lock) pthread_mutex_init (&(lock), 0)
  67 # define lock_fini(lock) pthread_mutex_destroy (&(lock))
  68 # define lock_lock(lock) pthread_mutex_lock (&(lock))
  69 # define lock_unlock(lock) pthread_mutex_unlock (&(lock))
  70 #else
  71 # define lock_define(name)
  72 # define lock_init(lock) 0
  73 # define lock_fini(lock) ((void) 0)
  74   /* The 'dfa' avoids an "unused variable 'dfa'" warning from GCC.  */
  75 # define lock_lock(lock) ((void) dfa)
  76 # define lock_unlock(lock) ((void) 0)
  77 #endif
  78
  79 /* In case that the system doesn't have isblank().  */
  80 #if !defined _LIBC && ! (defined isblank || (HAVE_ISBLANK && HAVE_DECL_ISBLANK))
  81 # define isblank(ch) ((ch) == ' ' || (ch) == '\t')
  82 #endif
  83
  84 /* regex code assumes isascii has its usual numeric meaning,
  85    even if the portable character set uses EBCDIC encoding,
  86    and even if wint_t is wider than int.  */
  87 #ifndef _LIBC
  88 # undef isascii
  89 # define isascii(c) (((c) & ~0x7f) == 0)
  90 #endif
  91
  92 #ifdef _LIBC
  93 # ifndef _RE_DEFINE_LOCALE_FUNCTIONS
  94 #  define _RE_DEFINE_LOCALE_FUNCTIONS 1
  95 #   include <locale/localeinfo.h>
  96 #   include <locale/coll-lookup.h>
  97 # endif
  98 #endif
  99
 100 /* This is for other GNU distributions with internationalized messages.  */
 101 #if (HAVE_LIBINTL_H && ENABLE_NLS) || defined _LIBC
 102 # include <libintl.h>
 103 # ifdef _LIBC
 104 #  undef gettext
 105 #  define gettext(msgid) \
 106   __dcgettext (_libc_intl_domainname, msgid, LC_MESSAGES)
 107 # endif
 108 #else
 109 # undef gettext
 110 # define gettext(msgid) (msgid)
 111 #endif
 112
 113 #ifndef gettext_noop
 114 /* This define is so xgettext can find the internationalizable
 115    strings.  */
 116 # define gettext_noop(String) String
 117 #endif
 118
 119 #if (defined MB_CUR_MAX && HAVE_WCTYPE_H && HAVE_ISWCTYPE) || _LIBC
 120 # define RE_ENABLE_I18N
 121 #endif
 122
 123 /* Number of ASCII characters.  */
 124 #define ASCII_CHARS 0x80
 125
 126 /* Number of single byte characters.  */
 127 #define SBC_MAX (UCHAR_MAX + 1)
 128
 129 #define COLL_ELEM_LEN_MAX 8
 130
 131 /* The character which represents newline.  */
 132 #define NEWLINE_CHAR '\n'
 133 #define WIDE_NEWLINE_CHAR L'\n'
 134
 135 /* Rename to standard API for using out of glibc.  */
 136 #ifndef _LIBC
 137 # undef __wctype
 138 # undef __iswalnum
 139 # undef __iswctype
 140 # undef __towlower
 141 # undef __towupper
 142 # define __wctype wctype
 143 # define __iswalnum iswalnum
 144 # define __iswctype iswctype
 145 # define __towlower towlower
 146 # define __towupper towupper
 147 # define __btowc btowc
 148 # define __mbrtowc mbrtowc
 149 # define __wcrtomb wcrtomb
 150 # define __regfree regfree
 151 #endif /* not _LIBC */
 152
 153 #ifndef SSIZE_MAX
 154 # define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
 155 #endif
 156 #ifndef ULONG_WIDTH
 157 # define ULONG_WIDTH REGEX_UINTEGER_WIDTH (ULONG_MAX)
 158 /* The number of usable bits in an unsigned integer type with maximum
 159    value MAX, as an int expression suitable in #if.  Cover all known
 160    practical hosts.  This implementation exploits the fact that MAX is
 161    1 less than a power of 2, and merely counts the number of 1 bits in
 162    MAX; "COBn" means "count the number of 1 bits in the low-order n bits".  */
 163 # define REGEX_UINTEGER_WIDTH(max) REGEX_COB128 (max)
 164 # define REGEX_COB128(n) (REGEX_COB64 ((n) >> 31 >> 31 >> 2) + REGEX_COB64 (n))
 165 # define REGEX_COB64(n) (REGEX_COB32 ((n) >> 31 >> 1) + REGEX_COB32 (n))
 166 # define REGEX_COB32(n) (REGEX_COB16 ((n) >> 16) + REGEX_COB16 (n))
 167 # define REGEX_COB16(n) (REGEX_COB8 ((n) >> 8) + REGEX_COB8 (n))
 168 # define REGEX_COB8(n) (REGEX_COB4 ((n) >> 4) + REGEX_COB4 (n))
 169 # define REGEX_COB4(n) (!!((n) & 8) + !!((n) & 4) + !!((n) & 2) + ((n) & 1))
 170 # if ULONG_MAX / 2 + 1 != 1ul << (ULONG_WIDTH - 1)
 171 #  error "ULONG_MAX out of range"
 172 # endif
 173 #endif
 174
 175 /* The type of indexes into strings.  This is signed, not size_t,
 176    since the API requires indexes to fit in regoff_t anyway, and using
 177    signed integers makes the code a bit smaller and presumably faster.
 178    The traditional GNU regex implementation uses int for indexes.
 179    The POSIX-compatible implementation uses a possibly-wider type.
 180    The name 'Idx' is three letters to minimize the hassle of
 181    reindenting a lot of regex code that formerly used 'int'.  */
 182 typedef regoff_t Idx;
 183 #ifdef _REGEX_LARGE_OFFSETS
 184 # define IDX_MAX SSIZE_MAX
 185 #else
 186 # define IDX_MAX INT_MAX
 187 #endif
 188
 189 /* A hash value, suitable for computing hash tables.  */
 190 typedef __re_size_t re_hashval_t;
 191
 192 /* An integer used to represent a set of bits.  It must be unsigned,
 193    and must be at least as wide as unsigned int.  */
 194 typedef unsigned long int bitset_word_t;
 195 /* All bits set in a bitset_word_t.  */
 196 #define BITSET_WORD_MAX ULONG_MAX
 197 /* Number of bits in a bitset_word_t.  */
 198 #define BITSET_WORD_BITS ULONG_WIDTH
 199
 200 /* Number of bitset_word_t values in a bitset_t.  */
 201 #define BITSET_WORDS ((SBC_MAX + BITSET_WORD_BITS - 1) / BITSET_WORD_BITS)
 202
 203 typedef bitset_word_t bitset_t[BITSET_WORDS];
 204 typedef bitset_word_t *re_bitset_ptr_t;
 205 typedef const bitset_word_t *re_const_bitset_ptr_t;
 206
 207 #define PREV_WORD_CONSTRAINT 0x0001
 208 #define PREV_NOTWORD_CONSTRAINT 0x0002
 209 #define NEXT_WORD_CONSTRAINT 0x0004
 210 #define NEXT_NOTWORD_CONSTRAINT 0x0008
 211 #define PREV_NEWLINE_CONSTRAINT 0x0010
 212 #define NEXT_NEWLINE_CONSTRAINT 0x0020
 213 #define PREV_BEGBUF_CONSTRAINT 0x0040
 214 #define NEXT_ENDBUF_CONSTRAINT 0x0080
 215 #define WORD_DELIM_CONSTRAINT 0x0100
 216 #define NOT_WORD_DELIM_CONSTRAINT 0x0200
 217
 218 typedef enum
 219 {
 220   INSIDE_WORD = PREV_WORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
 221   WORD_FIRST = PREV_NOTWORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
 222   WORD_LAST = PREV_WORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT,
 223   INSIDE_NOTWORD = PREV_NOTWORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT,
 224   LINE_FIRST = PREV_NEWLINE_CONSTRAINT,
 225   LINE_LAST = NEXT_NEWLINE_CONSTRAINT,
 226   BUF_FIRST = PREV_BEGBUF_CONSTRAINT,
 227   BUF_LAST = NEXT_ENDBUF_CONSTRAINT,
 228   WORD_DELIM = WORD_DELIM_CONSTRAINT,
 229   NOT_WORD_DELIM = NOT_WORD_DELIM_CONSTRAINT
 230 } re_context_type;
 231
 232 typedef struct
 233 {
 234   Idx alloc;
 235   Idx nelem;
 236   Idx *elems;
 237 } re_node_set;
 238
 239 typedef enum
 240 {
 241   NON_TYPE = 0,
 242
 243   /* Node type, These are used by token, node, tree.  */
 244   CHARACTER = 1,
 245   END_OF_RE = 2,
 246   SIMPLE_BRACKET = 3,
 247   OP_BACK_REF = 4,
 248   OP_PERIOD = 5,
 249 #ifdef RE_ENABLE_I18N
 250   COMPLEX_BRACKET = 6,
 251   OP_UTF8_PERIOD = 7,
 252 #endif /* RE_ENABLE_I18N */
 253
 254   /* We define EPSILON_BIT as a macro so that OP_OPEN_SUBEXP is used
 255      when the debugger shows values of this enum type.  */
 256 #define EPSILON_BIT 8
 257   OP_OPEN_SUBEXP = EPSILON_BIT | 0,
 258   OP_CLOSE_SUBEXP = EPSILON_BIT | 1,
 259   OP_ALT = EPSILON_BIT | 2,
 260   OP_DUP_ASTERISK = EPSILON_BIT | 3,
 261   ANCHOR = EPSILON_BIT | 4,
 262
 263   /* Tree type, these are used only by tree. */
 264   CONCAT = 16,
 265   SUBEXP = 17,
 266
 267   /* Token type, these are used only by token.  */
 268   OP_DUP_PLUS = 18,
 269   OP_DUP_QUESTION,
 270   OP_OPEN_BRACKET,
 271   OP_CLOSE_BRACKET,
 272   OP_CHARSET_RANGE,
 273   OP_OPEN_DUP_NUM,
 274   OP_CLOSE_DUP_NUM,
 275   OP_NON_MATCH_LIST,
 276   OP_OPEN_COLL_ELEM,
 277   OP_CLOSE_COLL_ELEM,
 278   OP_OPEN_EQUIV_CLASS,
 279   OP_CLOSE_EQUIV_CLASS,
 280   OP_OPEN_CHAR_CLASS,
 281   OP_CLOSE_CHAR_CLASS,
 282   OP_WORD,
 283   OP_NOTWORD,
 284   OP_SPACE,
 285   OP_NOTSPACE,
 286   BACK_SLASH
 287
 288 } re_token_type_t;
 289
 290 #ifdef RE_ENABLE_I18N
 291 typedef struct
 292 {
 293   /* Multibyte characters.  */
 294   wchar_t *mbchars;
 295
 296   /* Collating symbols.  */
 297 # ifdef _LIBC
 298   int32_t *coll_syms;
 299 # endif
 300
 301   /* Equivalence classes. */
 302 # ifdef _LIBC
 303   int32_t *equiv_classes;
 304 # endif
 305
 306   /* Range expressions. */
 307 # ifdef _LIBC
 308   uint32_t *range_starts;
 309   uint32_t *range_ends;
 310 # else /* not _LIBC */
 311   wchar_t *range_starts;
 312   wchar_t *range_ends;
 313 # endif /* not _LIBC */
 314
 315   /* Character classes. */
 316   wctype_t *char_classes;
 317
 318   /* If this character set is the non-matching list.  */
 319   unsigned int non_match : 1;
 320
 321   /* # of multibyte characters.  */
 322   Idx nmbchars;
 323
 324   /* # of collating symbols.  */
 325   Idx ncoll_syms;
 326
 327   /* # of equivalence classes. */
 328   Idx nequiv_classes;
 329
 330   /* # of range expressions. */
 331   Idx nranges;
 332
 333   /* # of character classes. */
 334   Idx nchar_classes;
 335 } re_charset_t;
 336 #endif /* RE_ENABLE_I18N */
 337
 338 typedef struct
 339 {
 340   union
 341   {
 342     unsigned char c;            /* for CHARACTER */
 343     re_bitset_ptr_t sbcset;     /* for SIMPLE_BRACKET */
 344 #ifdef RE_ENABLE_I18N
 345     re_charset_t *mbcset;       /* for COMPLEX_BRACKET */
 346 #endif /* RE_ENABLE_I18N */
 347     Idx idx;                    /* for BACK_REF */
 348     re_context_type ctx_type;   /* for ANCHOR */
 349   } opr;
 350 #if (__GNUC__ >= 2 || defined __clang__) && !defined __STRICT_ANSI__
 351   re_token_type_t type : 8;
 352 #else
 353   re_token_type_t type;
 354 #endif
 355   unsigned int constraint : 10; /* context constraint */
 356   unsigned int duplicated : 1;
 357   unsigned int opt_subexp : 1;
 358 #ifdef RE_ENABLE_I18N
 359   unsigned int accept_mb : 1;
 360   /* These 2 bits can be moved into the union if needed (e.g. if running out
 361      of bits; move opr.c to opr.c.c and move the flags to opr.c.flags).  */
 362   unsigned int mb_partial : 1;
 363 #endif
 364   unsigned int word_char : 1;
 365 } re_token_t;
 366
 367 #define IS_EPSILON_NODE(type) ((type) & EPSILON_BIT)
 368
 369 struct re_string_t
 370 {
 371   /* Indicate the raw buffer which is the original string passed as an
 372      argument of regexec(), re_search(), etc..  */
 373   const unsigned char *raw_mbs;
 374   /* Store the multibyte string.  In case of "case insensitive mode" like
 375      REG_ICASE, upper cases of the string are stored, otherwise MBS points
 376      the same address that RAW_MBS points.  */
 377   unsigned char *mbs;
 378 #ifdef RE_ENABLE_I18N
 379   /* Store the wide character string which is corresponding to MBS.  */
 380   wint_t *wcs;
 381   Idx *offsets;
 382   mbstate_t cur_state;
 383 #endif
 384   /* Index in RAW_MBS.  Each character mbs[i] corresponds to
 385      raw_mbs[raw_mbs_idx + i].  */
 386   Idx raw_mbs_idx;
 387   /* The length of the valid characters in the buffers.  */
 388   Idx valid_len;
 389   /* The corresponding number of bytes in raw_mbs array.  */
 390   Idx valid_raw_len;
 391   /* The length of the buffers MBS and WCS.  */
 392   Idx bufs_len;
 393   /* The index in MBS, which is updated by re_string_fetch_byte.  */
 394   Idx cur_idx;
 395   /* length of RAW_MBS array.  */
 396   Idx raw_len;
 397   /* This is RAW_LEN - RAW_MBS_IDX + VALID_LEN - VALID_RAW_LEN.  */
 398   Idx len;
 399   /* End of the buffer may be shorter than its length in the cases such
 400      as re_match_2, re_search_2.  Then, we use STOP for end of the buffer
 401      instead of LEN.  */
 402   Idx raw_stop;
 403   /* This is RAW_STOP - RAW_MBS_IDX adjusted through OFFSETS.  */
 404   Idx stop;
 405
 406   /* The context of mbs[0].  We store the context independently, since
 407      the context of mbs[0] may be different from raw_mbs[0], which is
 408      the beginning of the input string.  */
 409   unsigned int tip_context;
 410   /* The translation passed as a part of an argument of re_compile_pattern.  */
 411   RE_TRANSLATE_TYPE trans;
 412   /* Copy of re_dfa_t's word_char.  */
 413   re_const_bitset_ptr_t word_char;
 414   /* true if REG_ICASE.  */
 415   unsigned char icase;
 416   unsigned char is_utf8;
 417   unsigned char map_notascii;
 418   unsigned char mbs_allocated;
 419   unsigned char offsets_needed;
 420   unsigned char newline_anchor;
 421   unsigned char word_ops_used;
 422   int mb_cur_max;
 423 };
 424 typedef struct re_string_t re_string_t;
 425
 426
 427 struct re_dfa_t;
 428 typedef struct re_dfa_t re_dfa_t;
 429
 430 #ifndef _LIBC
 431 # define IS_IN(libc) false
 432 #endif
 433
 434 #define re_string_peek_byte(pstr, offset) \
 435   ((pstr)->mbs[(pstr)->cur_idx + offset])
 436 #define re_string_fetch_byte(pstr) \
 437   ((pstr)->mbs[(pstr)->cur_idx++])
 438 #define re_string_first_byte(pstr, idx) \
 439   ((idx) == (pstr)->valid_len || (pstr)->wcs[idx] != WEOF)
 440 #define re_string_is_single_byte_char(pstr, idx) \
 441   ((pstr)->wcs[idx] != WEOF && ((pstr)->valid_len == (idx) + 1 \
 442                                 || (pstr)->wcs[(idx) + 1] != WEOF))
 443 #define re_string_eoi(pstr) ((pstr)->stop <= (pstr)->cur_idx)
 444 #define re_string_cur_idx(pstr) ((pstr)->cur_idx)
 445 #define re_string_get_buffer(pstr) ((pstr)->mbs)
 446 #define re_string_length(pstr) ((pstr)->len)
 447 #define re_string_byte_at(pstr,idx) ((pstr)->mbs[idx])
 448 #define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx))
 449 #define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx))
 450
 451 #ifdef _LIBC
 452 # define MALLOC_0_IS_NONNULL 1
 453 #elif !defined MALLOC_0_IS_NONNULL
 454 # define MALLOC_0_IS_NONNULL 0
 455 #endif
 456
 457 #ifndef MAX
 458 # define MAX(a,b) ((a) < (b) ? (b) : (a))
 459 #endif
 460 #ifndef MIN
 461 # define MIN(a,b) ((a) < (b) ? (a) : (b))
 462 #endif
 463
 464 #define re_malloc(t,n) ((t *) malloc ((n) * sizeof (t)))
 465 #define re_realloc(p,t,n) ((t *) realloc (p, (n) * sizeof (t)))
 466 #define re_free(p) free (p)
 467
 468 struct bin_tree_t
 469 {
 470   struct bin_tree_t *parent;
 471   struct bin_tree_t *left;
 472   struct bin_tree_t *right;
 473   struct bin_tree_t *first;
 474   struct bin_tree_t *next;
 475
 476   re_token_t token;
 477
 478   /* 'node_idx' is the index in dfa->nodes, if 'type' == 0.
 479      Otherwise 'type' indicate the type of this node.  */
 480   Idx node_idx;
 481 };
 482 typedef struct bin_tree_t bin_tree_t;
 483
 484 #define BIN_TREE_STORAGE_SIZE \
 485   ((1024 - sizeof (void *)) / sizeof (bin_tree_t))
 486
 487 struct bin_tree_storage_t
 488 {
 489   struct bin_tree_storage_t *next;
 490   bin_tree_t data[BIN_TREE_STORAGE_SIZE];
 491 };
 492 typedef struct bin_tree_storage_t bin_tree_storage_t;
 493
 494 #define CONTEXT_WORD 1
 495 #define CONTEXT_NEWLINE (CONTEXT_WORD << 1)
 496 #define CONTEXT_BEGBUF (CONTEXT_NEWLINE << 1)
 497 #define CONTEXT_ENDBUF (CONTEXT_BEGBUF << 1)
 498
 499 #define IS_WORD_CONTEXT(c) ((c) & CONTEXT_WORD)
 500 #define IS_NEWLINE_CONTEXT(c) ((c) & CONTEXT_NEWLINE)
 501 #define IS_BEGBUF_CONTEXT(c) ((c) & CONTEXT_BEGBUF)
 502 #define IS_ENDBUF_CONTEXT(c) ((c) & CONTEXT_ENDBUF)
 503 #define IS_ORDINARY_CONTEXT(c) ((c) == 0)
 504
 505 #define IS_WORD_CHAR(ch) (isalnum (ch) || (ch) == '_')
 506 #define IS_NEWLINE(ch) ((ch) == NEWLINE_CHAR)
 507 #define IS_WIDE_WORD_CHAR(ch) (__iswalnum (ch) || (ch) == L'_')
 508 #define IS_WIDE_NEWLINE(ch) ((ch) == WIDE_NEWLINE_CHAR)
 509
 510 #define NOT_SATISFY_PREV_CONSTRAINT(constraint,context) \
 511  ((((constraint) & PREV_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
 512   || ((constraint & PREV_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
 513   || ((constraint & PREV_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context))\
 514   || ((constraint & PREV_BEGBUF_CONSTRAINT) && !IS_BEGBUF_CONTEXT (context)))
 515
 516 #define NOT_SATISFY_NEXT_CONSTRAINT(constraint,context) \
 517  ((((constraint) & NEXT_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
 518   || (((constraint) & NEXT_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
 519   || (((constraint) & NEXT_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context)) \
 520   || (((constraint) & NEXT_ENDBUF_CONSTRAINT) && !IS_ENDBUF_CONTEXT (context)))
 521
 522 struct re_dfastate_t
 523 {
 524   re_hashval_t hash;
 525   re_node_set nodes;
 526   re_node_set non_eps_nodes;
 527   re_node_set inveclosure;
 528   re_node_set *entrance_nodes;
 529   struct re_dfastate_t **trtable, **word_trtable;
 530   unsigned int context : 4;
 531   unsigned int halt : 1;
 532   /* If this state can accept "multi byte".
 533      Note that we refer to multibyte characters, and multi character
 534      collating elements as "multi byte".  */
 535   unsigned int accept_mb : 1;
 536   /* If this state has backreference node(s).  */
 537   unsigned int has_backref : 1;
 538   unsigned int has_constraint : 1;
 539 };
 540 typedef struct re_dfastate_t re_dfastate_t;
 541
 542 struct re_state_table_entry
 543 {
 544   Idx num;
 545   Idx alloc;
 546   re_dfastate_t **array;
 547 };
 548
 549 /* Array type used in re_sub_match_last_t and re_sub_match_top_t.  */
 550
 551 typedef struct
 552 {
 553   Idx next_idx;
 554   Idx alloc;
 555   re_dfastate_t **array;
 556 } state_array_t;
 557
 558 /* Store information about the node NODE whose type is OP_CLOSE_SUBEXP.  */
 559
 560 typedef struct
 561 {
 562   Idx node;
 563   Idx str_idx; /* The position NODE match at.  */
 564   state_array_t path;
 565 } re_sub_match_last_t;
 566
 567 /* Store information about the node NODE whose type is OP_OPEN_SUBEXP.
 568    And information about the node, whose type is OP_CLOSE_SUBEXP,
 569    corresponding to NODE is stored in LASTS.  */
 570
 571 typedef struct
 572 {
 573   Idx str_idx;
 574   Idx node;
 575   state_array_t *path;
 576   Idx alasts; /* Allocation size of LASTS.  */
 577   Idx nlasts; /* The number of LASTS.  */
 578   re_sub_match_last_t **lasts;
 579 } re_sub_match_top_t;
 580
 581 struct re_backref_cache_entry
 582 {
 583   Idx node;
 584   Idx str_idx;
 585   Idx subexp_from;
 586   Idx subexp_to;
 587   bitset_word_t eps_reachable_subexps_map;
 588   char more;
 589 };
 590
 591 typedef struct
 592 {
 593   /* The string object corresponding to the input string.  */
 594   re_string_t input;
 595   const re_dfa_t *const dfa;
 596   /* EFLAGS of the argument of regexec.  */
 597   int eflags;
 598   /* Where the matching ends.  */
 599   Idx match_last;
 600   Idx last_node;
 601   /* The state log used by the matcher.  */
 602   re_dfastate_t **state_log;
 603   Idx state_log_top;
 604   /* Back reference cache.  */
 605   Idx nbkref_ents;
 606   Idx abkref_ents;
 607   struct re_backref_cache_entry *bkref_ents;
 608   int max_mb_elem_len;
 609   Idx nsub_tops;
 610   Idx asub_tops;
 611   re_sub_match_top_t **sub_tops;
 612 } re_match_context_t;
 613
 614 typedef struct
 615 {
 616   re_dfastate_t **sifted_states;
 617   re_dfastate_t **limited_states;
 618   Idx last_node;
 619   Idx last_str_idx;
 620   re_node_set limits;
 621 } re_sift_context_t;
 622
 623 struct re_fail_stack_ent_t
 624 {
 625   Idx idx;
 626   Idx node;
 627   regmatch_t *regs;
 628   re_node_set eps_via_nodes;
 629 };
 630
 631 struct re_fail_stack_t
 632 {
 633   Idx num;
 634   Idx alloc;
 635   struct re_fail_stack_ent_t *stack;
 636 };
 637
 638 struct re_dfa_t
 639 {
 640   re_token_t *nodes;
 641   size_t nodes_alloc;
 642   size_t nodes_len;
 643   Idx *nexts;
 644   Idx *org_indices;
 645   re_node_set *edests;
 646   re_node_set *eclosures;
 647   re_node_set *inveclosures;
 648   struct re_state_table_entry *state_table;
 649   re_dfastate_t *init_state;
 650   re_dfastate_t *init_state_word;
 651   re_dfastate_t *init_state_nl;
 652   re_dfastate_t *init_state_begbuf;
 653   bin_tree_t *str_tree;
 654   bin_tree_storage_t *str_tree_storage;
 655   re_bitset_ptr_t sb_char;
 656   int str_tree_storage_idx;
 657
 658   /* number of subexpressions 're_nsub' is in regex_t.  */
 659   re_hashval_t state_hash_mask;
 660   Idx init_node;
 661   Idx nbackref; /* The number of backreference in this dfa.  */
 662
 663   /* Bitmap expressing which backreference is used.  */
 664   bitset_word_t used_bkref_map;
 665   bitset_word_t completed_bkref_map;
 666
 667   unsigned int has_plural_match : 1;
 668   /* If this dfa has "multibyte node", which is a backreference or
 669      a node which can accept multibyte character or multi character
 670      collating element.  */
 671   unsigned int has_mb_node : 1;
 672   unsigned int is_utf8 : 1;
 673   unsigned int map_notascii : 1;
 674   unsigned int word_ops_used : 1;
 675   int mb_cur_max;
 676   bitset_t word_char;
 677   reg_syntax_t syntax;
 678   Idx *subexp_map;
 679 #ifdef DEBUG
 680   char* re_str;
 681 #endif
 682   lock_define (lock)
 683 };
 684
 685 #define re_node_set_init_empty(set) memset (set, '\0', sizeof (re_node_set))
 686 #define re_node_set_remove(set,id) \
 687   (re_node_set_remove_at (set, re_node_set_contains (set, id) - 1))
 688 #define re_node_set_empty(p) ((p)->nelem = 0)
 689 #define re_node_set_free(set) re_free ((set)->elems)
 690 \f
 691
 692 typedef enum
 693 {
 694   SB_CHAR,
 695   MB_CHAR,
 696   EQUIV_CLASS,
 697   COLL_SYM,
 698   CHAR_CLASS
 699 } bracket_elem_type;
 700
 701 typedef struct
 702 {
 703   bracket_elem_type type;
 704   union
 705   {
 706     unsigned char ch;
 707     unsigned char *name;
 708     wchar_t wch;
 709   } opr;
 710 } bracket_elem_t;
 711
 712
 713 /* Functions for bitset_t operation.  */
 714
 715 static inline void
 716 bitset_set (bitset_t set, Idx i)
 717 {
 718   set[i / BITSET_WORD_BITS] |= (bitset_word_t) 1 << i % BITSET_WORD_BITS;
 719 }
 720
 721 static inline void
 722 bitset_clear (bitset_t set, Idx i)
 723 {
 724   set[i / BITSET_WORD_BITS] &= ~ ((bitset_word_t) 1 << i % BITSET_WORD_BITS);
 725 }
 726
 727 static inline bool
 728 bitset_contain (const bitset_t set, Idx i)
 729 {
 730   return (set[i / BITSET_WORD_BITS] >> i % BITSET_WORD_BITS) & 1;
 731 }
 732
 733 static inline void
 734 bitset_empty (bitset_t set)
 735 {
 736   memset (set, '\0', sizeof (bitset_t));
 737 }
 738
 739 static inline void
 740 bitset_set_all (bitset_t set)
 741 {
 742   memset (set, -1, sizeof (bitset_word_t) * (SBC_MAX / BITSET_WORD_BITS));
 743   if (SBC_MAX % BITSET_WORD_BITS != 0)
 744     set[BITSET_WORDS - 1] =
 745       ((bitset_word_t) 1 << SBC_MAX % BITSET_WORD_BITS) - 1;
 746 }
 747
 748 static inline void
 749 bitset_copy (bitset_t dest, const bitset_t src)
 750 {
 751   memcpy (dest, src, sizeof (bitset_t));
 752 }
 753
 754 static inline void
 755 bitset_not (bitset_t set)
 756 {
 757   int bitset_i;
 758   for (bitset_i = 0; bitset_i < SBC_MAX / BITSET_WORD_BITS; ++bitset_i)
 759     set[bitset_i] = ~set[bitset_i];
 760   if (SBC_MAX % BITSET_WORD_BITS != 0)
 761     set[BITSET_WORDS - 1] =
 762       ((((bitset_word_t) 1 << SBC_MAX % BITSET_WORD_BITS) - 1)
 763        & ~set[BITSET_WORDS - 1]);
 764 }
 765
 766 static inline void
 767 bitset_merge (bitset_t dest, const bitset_t src)
 768 {
 769   int bitset_i;
 770   for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i)
 771     dest[bitset_i] |= src[bitset_i];
 772 }
 773
 774 static inline void
 775 bitset_mask (bitset_t dest, const bitset_t src)
 776 {
 777   int bitset_i;
 778   for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i)
 779     dest[bitset_i] &= src[bitset_i];
 780 }
 781
 782 #ifdef RE_ENABLE_I18N
 783 /* Functions for re_string.  */
 784 static int
 785 __attribute__ ((pure, unused))
 786 re_string_char_size_at (const re_string_t *pstr, Idx idx)
 787 {
 788   int byte_idx;
 789   if (pstr->mb_cur_max == 1)
 790     return 1;
 791   for (byte_idx = 1; idx + byte_idx < pstr->valid_len; ++byte_idx)
 792     if (pstr->wcs[idx + byte_idx] != WEOF)
 793       break;
 794   return byte_idx;
 795 }
 796
 797 static wint_t
 798 __attribute__ ((pure, unused))
 799 re_string_wchar_at (const re_string_t *pstr, Idx idx)
 800 {
 801   if (pstr->mb_cur_max == 1)
 802     return (wint_t) pstr->mbs[idx];
 803   return (wint_t) pstr->wcs[idx];
 804 }
 805
 806 # ifdef _LIBC
 807 #  include <locale/weight.h>
 808 # endif
 809
 810 static int
 811 __attribute__ ((pure, unused))
 812 re_string_elem_size_at (const re_string_t *pstr, Idx idx)
 813 {
 814 # ifdef _LIBC
 815   const unsigned char *p, *extra;
 816   const int32_t *table, *indirect;
 817   uint32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
 818
 819   if (nrules != 0)
 820     {
 821       table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
 822       extra = (const unsigned char *)
 823         _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB);
 824       indirect = (const int32_t *) _NL_CURRENT (LC_COLLATE,
 825                                                 _NL_COLLATE_INDIRECTMB);
 826       p = pstr->mbs + idx;
 827       findidx (table, indirect, extra, &p, pstr->len - idx);
 828       return p - pstr->mbs - idx;
 829     }
 830   else
 831 # endif /* _LIBC */
 832     return 1;
 833 }
 834 #endif /* RE_ENABLE_I18N */
 835
 836 #ifdef _LIBC
 837 # if __GNUC__ >= 7
 838 #  define FALLTHROUGH __attribute__ ((__fallthrough__))
 839 # else
 840 #  define FALLTHROUGH ((void) 0)
 841 # endif
 842 #else
 843 # include "attribute.h"
 844 #endif
 845
 846 #endif /*  _REGEX_INTERNAL_H */