/************************************************* * Perl-Compatible Regular Expressions * *************************************************/ /* PCRE is a library of functions to support regular expressions whose syntax and semantics are as close as possible to those of the Perl 5 language. Written by Philip Hazel Original API code Copyright (c) 1997-2012 University of Cambridge New API code Copyright (c) 2016-2018 University of Cambridge ----------------------------------------------------------------------------- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the University of Cambridge nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ----------------------------------------------------------------------------- */ /* This module contains the external function pcre2_dfa_match(), which is an alternative matching function that uses a sort of DFA algorithm (not a true FSM). This is NOT Perl-compatible, but it has advantages in certain applications. */ /* NOTE ABOUT PERFORMANCE: A user of this function sent some code that improved the performance of his patterns greatly. I could not use it as it stood, as it was not thread safe, and made assumptions about pattern sizes. Also, it caused test 7 to loop, and test 9 to crash with a segfault. The issue is the check for duplicate states, which is done by a simple linear search up the state list. (Grep for "duplicate" below to find the code.) For many patterns, there will never be many states active at one time, so a simple linear search is fine. In patterns that have many active states, it might be a bottleneck. The suggested code used an indexing scheme to remember which states had previously been used for each character, and avoided the linear search when it knew there was no chance of a duplicate. This was implemented when adding states to the state lists. I wrote some thread-safe, not-limited code to try something similar at the time of checking for duplicates (instead of when adding states), using index vectors on the stack. It did give a 13% improvement with one specially constructed pattern for certain subject strings, but on other strings and on many of the simpler patterns in the test suite it did worse. The major problem, I think, was the extra time to initialize the index. This had to be done for each call of internal_dfa_match(). (The supplied patch used a static vector, initialized only once - I suspect this was the cause of the problems with the tests.) Overall, I concluded that the gains in some cases did not outweigh the losses in others, so I abandoned this code. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #define NLBLOCK mb /* Block containing newline information */ #define PSSTART start_subject /* Field containing processed string start */ #define PSEND end_subject /* Field containing processed string end */ #include "pcre2_internal.h" #define PUBLIC_DFA_MATCH_OPTIONS \ (PCRE2_ANCHORED|PCRE2_ENDANCHORED|PCRE2_NOTBOL|PCRE2_NOTEOL|PCRE2_NOTEMPTY| \ PCRE2_NOTEMPTY_ATSTART|PCRE2_NO_UTF_CHECK|PCRE2_PARTIAL_HARD| \ PCRE2_PARTIAL_SOFT|PCRE2_DFA_SHORTEST|PCRE2_DFA_RESTART) /************************************************* * Code parameters and static tables * *************************************************/ /* These are offsets that are used to turn the OP_TYPESTAR and friends opcodes into others, under special conditions. A gap of 20 between the blocks should be enough. The resulting opcodes don't have to be less than 256 because they are never stored, so we push them well clear of the normal opcodes. */ #define OP_PROP_EXTRA 300 #define OP_EXTUNI_EXTRA 320 #define OP_ANYNL_EXTRA 340 #define OP_HSPACE_EXTRA 360 #define OP_VSPACE_EXTRA 380 /* This table identifies those opcodes that are followed immediately by a character that is to be tested in some way. This makes it possible to centralize the loading of these characters. In the case of Type * etc, the "character" is the opcode for \D, \d, \S, \s, \W, or \w, which will always be a small value. Non-zero values in the table are the offsets from the opcode where the character is to be found. ***NOTE*** If the start of this table is modified, the three tables that follow must also be modified. */ static const uint8_t coptable[] = { 0, /* End */ 0, 0, 0, 0, 0, /* \A, \G, \K, \B, \b */ 0, 0, 0, 0, 0, 0, /* \D, \d, \S, \s, \W, \w */ 0, 0, 0, /* Any, AllAny, Anybyte */ 0, 0, /* \P, \p */ 0, 0, 0, 0, 0, /* \R, \H, \h, \V, \v */ 0, /* \X */ 0, 0, 0, 0, 0, 0, /* \Z, \z, $, $M, ^, ^M */ 1, /* Char */ 1, /* Chari */ 1, /* not */ 1, /* noti */ /* Positive single-char repeats */ 1, 1, 1, 1, 1, 1, /* *, *?, +, +?, ?, ?? */ 1+IMM2_SIZE, 1+IMM2_SIZE, /* upto, minupto */ 1+IMM2_SIZE, /* exact */ 1, 1, 1, 1+IMM2_SIZE, /* *+, ++, ?+, upto+ */ 1, 1, 1, 1, 1, 1, /* *I, *?I, +I, +?I, ?I, ??I */ 1+IMM2_SIZE, 1+IMM2_SIZE, /* upto I, minupto I */ 1+IMM2_SIZE, /* exact I */ 1, 1, 1, 1+IMM2_SIZE, /* *+I, ++I, ?+I, upto+I */ /* Negative single-char repeats - only for chars < 256 */ 1, 1, 1, 1, 1, 1, /* NOT *, *?, +, +?, ?, ?? */ 1+IMM2_SIZE, 1+IMM2_SIZE, /* NOT upto, minupto */ 1+IMM2_SIZE, /* NOT exact */ 1, 1, 1, 1+IMM2_SIZE, /* NOT *+, ++, ?+, upto+ */ 1, 1, 1, 1, 1, 1, /* NOT *I, *?I, +I, +?I, ?I, ??I */ 1+IMM2_SIZE, 1+IMM2_SIZE, /* NOT upto I, minupto I */ 1+IMM2_SIZE, /* NOT exact I */ 1, 1, 1, 1+IMM2_SIZE, /* NOT *+I, ++I, ?+I, upto+I */ /* Positive type repeats */ 1, 1, 1, 1, 1, 1, /* Type *, *?, +, +?, ?, ?? */ 1+IMM2_SIZE, 1+IMM2_SIZE, /* Type upto, minupto */ 1+IMM2_SIZE, /* Type exact */ 1, 1, 1, 1+IMM2_SIZE, /* Type *+, ++, ?+, upto+ */ /* Character class & ref repeats */ 0, 0, 0, 0, 0, 0, /* *, *?, +, +?, ?, ?? */ 0, 0, /* CRRANGE, CRMINRANGE */ 0, 0, 0, 0, /* Possessive *+, ++, ?+, CRPOSRANGE */ 0, /* CLASS */ 0, /* NCLASS */ 0, /* XCLASS - variable length */ 0, /* REF */ 0, /* REFI */ 0, /* DNREF */ 0, /* DNREFI */ 0, /* RECURSE */ 0, /* CALLOUT */ 0, /* CALLOUT_STR */ 0, /* Alt */ 0, /* Ket */ 0, /* KetRmax */ 0, /* KetRmin */ 0, /* KetRpos */ 0, /* Reverse */ 0, /* Assert */ 0, /* Assert not */ 0, /* Assert behind */ 0, /* Assert behind not */ 0, /* ONCE */ 0, 0, 0, 0, 0, /* BRA, BRAPOS, CBRA, CBRAPOS, COND */ 0, 0, 0, 0, 0, /* SBRA, SBRAPOS, SCBRA, SCBRAPOS, SCOND */ 0, 0, /* CREF, DNCREF */ 0, 0, /* RREF, DNRREF */ 0, 0, /* FALSE, TRUE */ 0, 0, 0, /* BRAZERO, BRAMINZERO, BRAPOSZERO */ 0, 0, 0, /* MARK, PRUNE, PRUNE_ARG */ 0, 0, 0, 0, /* SKIP, SKIP_ARG, THEN, THEN_ARG */ 0, 0, 0, 0, /* COMMIT, FAIL, ACCEPT, ASSERT_ACCEPT */ 0, 0, 0 /* CLOSE, SKIPZERO, DEFINE */ }; /* This table identifies those opcodes that inspect a character. It is used to remember the fact that a character could have been inspected when the end of the subject is reached. ***NOTE*** If the start of this table is modified, the two tables that follow must also be modified. */ static const uint8_t poptable[] = { 0, /* End */ 0, 0, 0, 1, 1, /* \A, \G, \K, \B, \b */ 1, 1, 1, 1, 1, 1, /* \D, \d, \S, \s, \W, \w */ 1, 1, 1, /* Any, AllAny, Anybyte */ 1, 1, /* \P, \p */ 1, 1, 1, 1, 1, /* \R, \H, \h, \V, \v */ 1, /* \X */ 0, 0, 0, 0, 0, 0, /* \Z, \z, $, $M, ^, ^M */ 1, /* Char */ 1, /* Chari */ 1, /* not */ 1, /* noti */ /* Positive single-char repeats */ 1, 1, 1, 1, 1, 1, /* *, *?, +, +?, ?, ?? */ 1, 1, 1, /* upto, minupto, exact */ 1, 1, 1, 1, /* *+, ++, ?+, upto+ */ 1, 1, 1, 1, 1, 1, /* *I, *?I, +I, +?I, ?I, ??I */ 1, 1, 1, /* upto I, minupto I, exact I */ 1, 1, 1, 1, /* *+I, ++I, ?+I, upto+I */ /* Negative single-char repeats - only for chars < 256 */ 1, 1, 1, 1, 1, 1, /* NOT *, *?, +, +?, ?, ?? */ 1, 1, 1, /* NOT upto, minupto, exact */ 1, 1, 1, 1, /* NOT *+, ++, ?+, upto+ */ 1, 1, 1, 1, 1, 1, /* NOT *I, *?I, +I, +?I, ?I, ??I */ 1, 1, 1, /* NOT upto I, minupto I, exact I */ 1, 1, 1, 1, /* NOT *+I, ++I, ?+I, upto+I */ /* Positive type repeats */ 1, 1, 1, 1, 1, 1, /* Type *, *?, +, +?, ?, ?? */ 1, 1, 1, /* Type upto, minupto, exact */ 1, 1, 1, 1, /* Type *+, ++, ?+, upto+ */ /* Character class & ref repeats */ 1, 1, 1, 1, 1, 1, /* *, *?, +, +?, ?, ?? */ 1, 1, /* CRRANGE, CRMINRANGE */ 1, 1, 1, 1, /* Possessive *+, ++, ?+, CRPOSRANGE */ 1, /* CLASS */ 1, /* NCLASS */ 1, /* XCLASS - variable length */ 0, /* REF */ 0, /* REFI */ 0, /* DNREF */ 0, /* DNREFI */ 0, /* RECURSE */ 0, /* CALLOUT */ 0, /* CALLOUT_STR */ 0, /* Alt */ 0, /* Ket */ 0, /* KetRmax */ 0, /* KetRmin */ 0, /* KetRpos */ 0, /* Reverse */ 0, /* Assert */ 0, /* Assert not */ 0, /* Assert behind */ 0, /* Assert behind not */ 0, /* ONCE */ 0, 0, 0, 0, 0, /* BRA, BRAPOS, CBRA, CBRAPOS, COND */ 0, 0, 0, 0, 0, /* SBRA, SBRAPOS, SCBRA, SCBRAPOS, SCOND */ 0, 0, /* CREF, DNCREF */ 0, 0, /* RREF, DNRREF */ 0, 0, /* FALSE, TRUE */ 0, 0, 0, /* BRAZERO, BRAMINZERO, BRAPOSZERO */ 0, 0, 0, /* MARK, PRUNE, PRUNE_ARG */ 0, 0, 0, 0, /* SKIP, SKIP_ARG, THEN, THEN_ARG */ 0, 0, 0, 0, /* COMMIT, FAIL, ACCEPT, ASSERT_ACCEPT */ 0, 0, 0 /* CLOSE, SKIPZERO, DEFINE */ }; /* These 2 tables allow for compact code for testing for \D, \d, \S, \s, \W, and \w */ static const uint8_t toptable1[] = { 0, 0, 0, 0, 0, 0, ctype_digit, ctype_digit, ctype_space, ctype_space, ctype_word, ctype_word, 0, 0 /* OP_ANY, OP_ALLANY */ }; static const uint8_t toptable2[] = { 0, 0, 0, 0, 0, 0, ctype_digit, 0, ctype_space, 0, ctype_word, 0, 1, 1 /* OP_ANY, OP_ALLANY */ }; /* Structure for holding data about a particular state, which is in effect the current data for an active path through the match tree. It must consist entirely of ints because the working vector we are passed, and which we put these structures in, is a vector of ints. */ typedef struct stateblock { int offset; /* Offset to opcode (-ve has meaning) */ int count; /* Count for repeats */ int data; /* Some use extra data */ } stateblock; #define INTS_PER_STATEBLOCK (int)(sizeof(stateblock)/sizeof(int)) /* Before version 10.32 the recursive calls of internal_dfa_match() were passed local working space and output vectors that were created on the stack. This has caused issues for some patterns, especially in small-stack environments such as Windows. A new scheme is now in use which sets up a vector on the stack, but if this is too small, heap memory is used, up to the heap_limit. The main parameters are all numbers of ints because the workspace is a vector of ints. The size of the starting stack vector, DFA_START_RWS_SIZE, is in bytes, and is defined in pcre2_internal.h so as to be available to pcre2test when it is finding the minimum heap requirement for a match. */ #define OVEC_UNIT (sizeof(PCRE2_SIZE)/sizeof(int)) #define RWS_BASE_SIZE (DFA_START_RWS_SIZE/sizeof(int)) /* Stack vector */ #define RWS_RSIZE 1000 /* Work size for recursion */ #define RWS_OVEC_RSIZE (1000*OVEC_UNIT) /* Ovector for recursion */ #define RWS_OVEC_OSIZE (2*OVEC_UNIT) /* Ovector in other cases */ /* This structure is at the start of each workspace block. */ typedef struct RWS_anchor { struct RWS_anchor *next; unsigned int size; /* Number of ints */ unsigned int free; /* Number of ints */ } RWS_anchor; #define RWS_ANCHOR_SIZE (sizeof(RWS_anchor)/sizeof(int)) /************************************************* * Process a callout * *************************************************/ /* This function is called to perform a callout. Arguments: code current code pointer offsets points to current capture offsets current_subject start of current subject match ptr current position in subject mb the match block extracode extra code offset when called from condition lengthptr where to return the callout length Returns: the return from the callout */ static int do_callout(PCRE2_SPTR code, PCRE2_SIZE *offsets, PCRE2_SPTR current_subject, PCRE2_SPTR ptr, dfa_match_block *mb, PCRE2_SIZE extracode, PCRE2_SIZE *lengthptr) { pcre2_callout_block *cb = mb->cb; *lengthptr = (code[extracode] == OP_CALLOUT)? (PCRE2_SIZE)PRIV(OP_lengths)[OP_CALLOUT] : (PCRE2_SIZE)GET(code, 1 + 2*LINK_SIZE + extracode); if (mb->callout == NULL) return 0; /* No callout provided */ /* Fixed fields in the callout block are set once and for all at the start of matching. */ cb->offset_vector = offsets; cb->start_match = (PCRE2_SIZE)(current_subject - mb->start_subject); cb->current_position = (PCRE2_SIZE)(ptr - mb->start_subject); cb->pattern_position = GET(code, 1 + extracode); cb->next_item_length = GET(code, 1 + LINK_SIZE + extracode); if (code[extracode] == OP_CALLOUT) { cb->callout_number = code[1 + 2*LINK_SIZE + extracode]; cb->callout_string_offset = 0; cb->callout_string = NULL; cb->callout_string_length = 0; } else { cb->callout_number = 0; cb->callout_string_offset = GET(code, 1 + 3*LINK_SIZE + extracode); cb->callout_string = code + (1 + 4*LINK_SIZE + extracode) + 1; cb->callout_string_length = *lengthptr - (1 + 4*LINK_SIZE) - 2; } return (mb->callout)(cb, mb->callout_data); } /************************************************* * Expand local workspace memory * *************************************************/ /* This function is called when internal_dfa_match() is about to be called recursively and there is insufficient workingspace left in the current work space block. If there's an existing next block, use it; otherwise get a new block unless the heap limit is reached. Arguments: rwsptr pointer to block pointer (updated) ovecsize space needed for an ovector mb the match block Returns: 0 rwsptr has been updated !0 an error code */ static int more_workspace(RWS_anchor **rwsptr, unsigned int ovecsize, dfa_match_block *mb) { RWS_anchor *rws = *rwsptr; RWS_anchor *new; if (rws->next != NULL) { new = rws->next; } /* All sizes are in units of sizeof(int), except for mb->heaplimit, which is in kilobytes. */ else { unsigned int newsize = rws->size * 2; unsigned int heapleft = (unsigned int) (((1024/sizeof(int))*mb->heap_limit - mb->heap_used)); if (newsize > heapleft) newsize = heapleft; if (newsize < RWS_RSIZE + ovecsize + RWS_ANCHOR_SIZE) return PCRE2_ERROR_HEAPLIMIT; new = mb->memctl.malloc(newsize*sizeof(int), mb->memctl.memory_data); if (new == NULL) return PCRE2_ERROR_NOMEMORY; mb->heap_used += newsize; new->next = NULL; new->size = newsize; rws->next = new; } new->free = new->size - RWS_ANCHOR_SIZE; *rwsptr = new; return 0; } /************************************************* * Match a Regular Expression - DFA engine * *************************************************/ /* This internal function applies a compiled pattern to a subject string, starting at a given point, using a DFA engine. This function is called from the external one, possibly multiple times if the pattern is not anchored. The function calls itself recursively for some kinds of subpattern. Arguments: mb the match_data block with fixed information this_start_code the opening bracket of this subexpression's code current_subject where we currently are in the subject string start_offset start offset in the subject string offsets vector to contain the matching string offsets offsetcount size of same workspace vector of workspace wscount size of same rlevel function call recursion level Returns: > 0 => number of match offset pairs placed in offsets = 0 => offsets overflowed; longest matches are present -1 => failed to match < -1 => some kind of unexpected problem The following macros are used for adding states to the two state vectors (one for the current character, one for the following character). */ #define ADD_ACTIVE(x,y) \ if (active_count++ < wscount) \ { \ next_active_state->offset = (x); \ next_active_state->count = (y); \ next_active_state++; \ } \ else return PCRE2_ERROR_DFA_WSSIZE #define ADD_ACTIVE_DATA(x,y,z) \ if (active_count++ < wscount) \ { \ next_active_state->offset = (x); \ next_active_state->count = (y); \ next_active_state->data = (z); \ next_active_state++; \ } \ else return PCRE2_ERROR_DFA_WSSIZE #define ADD_NEW(x,y) \ if (new_count++ < wscount) \ { \ next_new_state->offset = (x); \ next_new_state->count = (y); \ next_new_state++; \ } \ else return PCRE2_ERROR_DFA_WSSIZE #define ADD_NEW_DATA(x,y,z) \ if (new_count++ < wscount) \ { \ next_new_state->offset = (x); \ next_new_state->count = (y); \ next_new_state->data = (z); \ next_new_state++; \ } \ else return PCRE2_ERROR_DFA_WSSIZE /* And now, here is the code */ static int internal_dfa_match( dfa_match_block *mb, PCRE2_SPTR this_start_code, PCRE2_SPTR current_subject, PCRE2_SIZE start_offset, PCRE2_SIZE *offsets, uint32_t offsetcount, int *workspace, int wscount, uint32_t rlevel, int *RWS) { stateblock *active_states, *new_states, *temp_states; stateblock *next_active_state, *next_new_state; const uint8_t *ctypes, *lcc, *fcc; PCRE2_SPTR ptr; PCRE2_SPTR end_code; dfa_recursion_info new_recursive; int active_count, new_count, match_count; /* Some fields in the mb block are frequently referenced, so we load them into independent variables in the hope that this will perform better. */ PCRE2_SPTR start_subject = mb->start_subject; PCRE2_SPTR end_subject = mb->end_subject; PCRE2_SPTR start_code = mb->start_code; #ifdef SUPPORT_UNICODE BOOL utf = (mb->poptions & PCRE2_UTF) != 0; #else BOOL utf = FALSE; #endif BOOL reset_could_continue = FALSE; if (mb->match_call_count++ >= mb->match_limit) return PCRE2_ERROR_MATCHLIMIT; if (rlevel++ > mb->match_limit_depth) return PCRE2_ERROR_DEPTHLIMIT; offsetcount &= (uint32_t)(-2); /* Round down */ wscount -= 2; wscount = (wscount - (wscount % (INTS_PER_STATEBLOCK * 2))) / (2 * INTS_PER_STATEBLOCK); ctypes = mb->tables + ctypes_offset; lcc = mb->tables + lcc_offset; fcc = mb->tables + fcc_offset; match_count = PCRE2_ERROR_NOMATCH; /* A negative number */ active_states = (stateblock *)(workspace + 2); next_new_state = new_states = active_states + wscount; new_count = 0; /* The first thing in any (sub) pattern is a bracket of some sort. Push all the alternative states onto the list, and find out where the end is. This makes is possible to use this function recursively, when we want to stop at a matching internal ket rather than at the end. If we are dealing with a backward assertion we have to find out the maximum amount to move back, and set up each alternative appropriately. */ if (*this_start_code == OP_ASSERTBACK || *this_start_code == OP_ASSERTBACK_NOT) { size_t max_back = 0; size_t gone_back; end_code = this_start_code; do { size_t back = (size_t)GET(end_code, 2+LINK_SIZE); if (back > max_back) max_back = back; end_code += GET(end_code, 1); } while (*end_code == OP_ALT); /* If we can't go back the amount required for the longest lookbehind pattern, go back as far as we can; some alternatives may still be viable. */ #ifdef SUPPORT_UNICODE /* In character mode we have to step back character by character */ if (utf) { for (gone_back = 0; gone_back < max_back; gone_back++) { if (current_subject <= start_subject) break; current_subject--; ACROSSCHAR(current_subject > start_subject, current_subject, current_subject--); } } else #endif /* In byte-mode we can do this quickly. */ { size_t current_offset = (size_t)(current_subject - start_subject); gone_back = (current_offset < max_back)? current_offset : max_back; current_subject -= gone_back; } /* Save the earliest consulted character */ if (current_subject < mb->start_used_ptr) mb->start_used_ptr = current_subject; /* Now we can process the individual branches. There will be an OP_REVERSE at the start of each branch, except when the length of the branch is zero. */ end_code = this_start_code; do { uint32_t revlen = (end_code[1+LINK_SIZE] == OP_REVERSE)? 1 + LINK_SIZE : 0; size_t back = (revlen == 0)? 0 : (size_t)GET(end_code, 2+LINK_SIZE); if (back <= gone_back) { int bstate = (int)(end_code - start_code + 1 + LINK_SIZE + revlen); ADD_NEW_DATA(-bstate, 0, (int)(gone_back - back)); } end_code += GET(end_code, 1); } while (*end_code == OP_ALT); } /* This is the code for a "normal" subpattern (not a backward assertion). The start of a whole pattern is always one of these. If we are at the top level, we may be asked to restart matching from the same point that we reached for a previous partial match. We still have to scan through the top-level branches to find the end state. */ else { end_code = this_start_code; /* Restarting */ if (rlevel == 1 && (mb->moptions & PCRE2_DFA_RESTART) != 0) { do { end_code += GET(end_code, 1); } while (*end_code == OP_ALT); new_count = workspace[1]; if (!workspace[0]) memcpy(new_states, active_states, (size_t)new_count * sizeof(stateblock)); } /* Not restarting */ else { int length = 1 + LINK_SIZE + ((*this_start_code == OP_CBRA || *this_start_code == OP_SCBRA || *this_start_code == OP_CBRAPOS || *this_start_code == OP_SCBRAPOS) ? IMM2_SIZE:0); do { ADD_NEW((int)(end_code - start_code + length), 0); end_code += GET(end_code, 1); length = 1 + LINK_SIZE; } while (*end_code == OP_ALT); } } workspace[0] = 0; /* Bit indicating which vector is current */ /* Loop for scanning the subject */ ptr = current_subject; for (;;) { int i, j; int clen, dlen; uint32_t c, d; int forced_fail = 0; BOOL partial_newline = FALSE; BOOL could_continue = reset_could_continue; reset_could_continue = FALSE; if (ptr > mb->last_used_ptr) mb->last_used_ptr = ptr; /* Make the new state list into the active state list and empty the new state list. */ temp_states = active_states; active_states = new_states; new_states = temp_states; active_count = new_count; new_count = 0; workspace[0] ^= 1; /* Remember for the restarting feature */ workspace[1] = active_count; /* Set the pointers for adding new states */ next_active_state = active_states + active_count; next_new_state = new_states; /* Load the current character from the subject outside the loop, as many different states may want to look at it, and we assume that at least one will. */ if (ptr < end_subject) { clen = 1; /* Number of data items in the character */ #ifdef SUPPORT_UNICODE GETCHARLENTEST(c, ptr, clen); #else c = *ptr; #endif /* SUPPORT_UNICODE */ } else { clen = 0; /* This indicates the end of the subject */ c = NOTACHAR; /* This value should never actually be used */ } /* Scan up the active states and act on each one. The result of an action may be to add more states to the currently active list (e.g. on hitting a parenthesis) or it may be to put states on the new list, for considering when we move the character pointer on. */ for (i = 0; i < active_count; i++) { stateblock *current_state = active_states + i; BOOL caseless = FALSE; PCRE2_SPTR code; uint32_t codevalue; int state_offset = current_state->offset; int rrc; int count; /* A negative offset is a special case meaning "hold off going to this (negated) state until the number of characters in the data field have been skipped". If the could_continue flag was passed over from a previous state, arrange for it to passed on. */ if (state_offset < 0) { if (current_state->data > 0) { ADD_NEW_DATA(state_offset, current_state->count, current_state->data - 1); if (could_continue) reset_could_continue = TRUE; continue; } else { current_state->offset = state_offset = -state_offset; } } /* Check for a duplicate state with the same count, and skip if found. See the note at the head of this module about the possibility of improving performance here. */ for (j = 0; j < i; j++) { if (active_states[j].offset == state_offset && active_states[j].count == current_state->count) goto NEXT_ACTIVE_STATE; } /* The state offset is the offset to the opcode */ code = start_code + state_offset; codevalue = *code; /* If this opcode inspects a character, but we are at the end of the subject, remember the fact for use when testing for a partial match. */ if (clen == 0 && poptable[codevalue] != 0) could_continue = TRUE; /* If this opcode is followed by an inline character, load it. It is tempting to test for the presence of a subject character here, but that is wrong, because sometimes zero repetitions of the subject are permitted. We also use this mechanism for opcodes such as OP_TYPEPLUS that take an argument that is not a data character - but is always one byte long because the values are small. We have to take special action to deal with \P, \p, \H, \h, \V, \v and \X in this case. To keep the other cases fast, convert these ones to new opcodes. */ if (coptable[codevalue] > 0) { dlen = 1; #ifdef SUPPORT_UNICODE if (utf) { GETCHARLEN(d, (code + coptable[codevalue]), dlen); } else #endif /* SUPPORT_UNICODE */ d = code[coptable[codevalue]]; if (codevalue >= OP_TYPESTAR) { switch(d) { case OP_ANYBYTE: return PCRE2_ERROR_DFA_UITEM; case OP_NOTPROP: case OP_PROP: codevalue += OP_PROP_EXTRA; break; case OP_ANYNL: codevalue += OP_ANYNL_EXTRA; break; case OP_EXTUNI: codevalue += OP_EXTUNI_EXTRA; break; case OP_NOT_HSPACE: case OP_HSPACE: codevalue += OP_HSPACE_EXTRA; break; case OP_NOT_VSPACE: case OP_VSPACE: codevalue += OP_VSPACE_EXTRA; break; default: break; } } } else { dlen = 0; /* Not strictly necessary, but compilers moan */ d = NOTACHAR; /* if these variables are not set. */ } /* Now process the individual opcodes */ switch (codevalue) { /* ========================================================================== */ /* These cases are never obeyed. This is a fudge that causes a compile- time error if the vectors coptable or poptable, which are indexed by opcode, are not the correct length. It seems to be the only way to do such a check at compile time, as the sizeof() operator does not work in the C preprocessor. */ case OP_TABLE_LENGTH: case OP_TABLE_LENGTH + ((sizeof(coptable) == OP_TABLE_LENGTH) && (sizeof(poptable) == OP_TABLE_LENGTH)): return 0; /* ========================================================================== */ /* Reached a closing bracket. If not at the end of the pattern, carry on with the next opcode. For repeating opcodes, also add the repeat state. Note that KETRPOS will always be encountered at the end of the subpattern, because the possessive subpattern repeats are always handled using recursive calls. Thus, it never adds any new states. At the end of the (sub)pattern, unless we have an empty string and PCRE2_NOTEMPTY is set, or PCRE2_NOTEMPTY_ATSTART is set and we are at the start of the subject, save the match data, shifting up all previous matches so we always have the longest first. */ case OP_KET: case OP_KETRMIN: case OP_KETRMAX: case OP_KETRPOS: if (code != end_code) { ADD_ACTIVE(state_offset + 1 + LINK_SIZE, 0); if (codevalue != OP_KET) { ADD_ACTIVE(state_offset - (int)GET(code, 1), 0); } } else { if (ptr > current_subject || ((mb->moptions & PCRE2_NOTEMPTY) == 0 && ((mb->moptions & PCRE2_NOTEMPTY_ATSTART) == 0 || current_subject > start_subject + mb->start_offset))) { if (match_count < 0) match_count = (offsetcount >= 2)? 1 : 0; else if (match_count > 0 && ++match_count * 2 > (int)offsetcount) match_count = 0; count = ((match_count == 0)? (int)offsetcount : match_count * 2) - 2; if (count > 0) memmove(offsets + 2, offsets, (size_t)count * sizeof(PCRE2_SIZE)); if (offsetcount >= 2) { offsets[0] = (PCRE2_SIZE)(current_subject - start_subject); offsets[1] = (PCRE2_SIZE)(ptr - start_subject); } if ((mb->moptions & PCRE2_DFA_SHORTEST) != 0) return match_count; } } break; /* ========================================================================== */ /* These opcodes add to the current list of states without looking at the current character. */ /*-----------------------------------------------------------------*/ case OP_ALT: do { code += GET(code, 1); } while (*code == OP_ALT); ADD_ACTIVE((int)(code - start_code), 0); break; /*-----------------------------------------------------------------*/ case OP_BRA: case OP_SBRA: do { ADD_ACTIVE((int)(code - start_code + 1 + LINK_SIZE), 0); code += GET(code, 1); } while (*code == OP_ALT); break; /*-----------------------------------------------------------------*/ case OP_CBRA: case OP_SCBRA: ADD_ACTIVE((int)(code - start_code + 1 + LINK_SIZE + IMM2_SIZE), 0); code += GET(code, 1); while (*code == OP_ALT) { ADD_ACTIVE((int)(code - start_code + 1 + LINK_SIZE), 0); code += GET(code, 1); } break; /*-----------------------------------------------------------------*/ case OP_BRAZERO: case OP_BRAMINZERO: ADD_ACTIVE(state_offset + 1, 0); code += 1 + GET(code, 2); while (*code == OP_ALT) code += GET(code, 1); ADD_ACTIVE((int)(code - start_code + 1 + LINK_SIZE), 0); break; /*-----------------------------------------------------------------*/ case OP_SKIPZERO: code += 1 + GET(code, 2); while (*code == OP_ALT) code += GET(code, 1); ADD_ACTIVE((int)(code - start_code + 1 + LINK_SIZE), 0); break; /*-----------------------------------------------------------------*/ case OP_CIRC: if (ptr == start_subject && (mb->moptions & PCRE2_NOTBOL) == 0) { ADD_ACTIVE(state_offset + 1, 0); } break; /*-----------------------------------------------------------------*/ case OP_CIRCM: if ((ptr == start_subject && (mb->moptions & PCRE2_NOTBOL) == 0) || ((ptr != end_subject || (mb->poptions & PCRE2_ALT_CIRCUMFLEX) != 0 ) && WAS_NEWLINE(ptr))) { ADD_ACTIVE(state_offset + 1, 0); } break; /*-----------------------------------------------------------------*/ case OP_EOD: if (ptr >= end_subject) { if ((mb->moptions & PCRE2_PARTIAL_HARD) != 0) could_continue = TRUE; else { ADD_ACTIVE(state_offset + 1, 0); } } break; /*-----------------------------------------------------------------*/ case OP_SOD: if (ptr == start_subject) { ADD_ACTIVE(state_offset + 1, 0); } break; /*-----------------------------------------------------------------*/ case OP_SOM: if (ptr == start_subject + start_offset) { ADD_ACTIVE(state_offset + 1, 0); } break; /* ========================================================================== */ /* These opcodes inspect the next subject character, and sometimes the previous one as well, but do not have an argument. The variable clen contains the length of the current character and is zero if we are at the end of the subject. */ /*-----------------------------------------------------------------*/ case OP_ANY: if (clen > 0 && !IS_NEWLINE(ptr)) { if (ptr + 1 >= mb->end_subject && (mb->moptions & (PCRE2_PARTIAL_HARD)) != 0 && NLBLOCK->nltype == NLTYPE_FIXED && NLBLOCK->nllen == 2 && c == NLBLOCK->nl[0]) { could_continue = partial_newline = TRUE; } else { ADD_NEW(state_offset + 1, 0); } } break; /*-----------------------------------------------------------------*/ case OP_ALLANY: if (clen > 0) { ADD_NEW(state_offset + 1, 0); } break; /*-----------------------------------------------------------------*/ case OP_EODN: if (clen == 0 && (mb->moptions & PCRE2_PARTIAL_HARD) != 0) could_continue = TRUE; else if (clen == 0 || (IS_NEWLINE(ptr) && ptr == end_subject - mb->nllen)) { ADD_ACTIVE(state_offset + 1, 0); } break; /*-----------------------------------------------------------------*/ case OP_DOLL: if ((mb->moptions & PCRE2_NOTEOL) == 0) { if (clen == 0 && (mb->moptions & PCRE2_PARTIAL_HARD) != 0) could_continue = TRUE; else if (clen == 0 || ((mb->poptions & PCRE2_DOLLAR_ENDONLY) == 0 && IS_NEWLINE(ptr) && (ptr == end_subject - mb->nllen) )) { ADD_ACTIVE(state_offset + 1, 0); } else if (ptr + 1 >= mb->end_subject && (mb->moptions & (PCRE2_PARTIAL_HARD|PCRE2_PARTIAL_SOFT)) != 0 && NLBLOCK->nltype == NLTYPE_FIXED && NLBLOCK->nllen == 2 && c == NLBLOCK->nl[0]) { if ((mb->moptions & PCRE2_PARTIAL_HARD) != 0) { reset_could_continue = TRUE; ADD_NEW_DATA(-(state_offset + 1), 0, 1); } else could_continue = partial_newline = TRUE; } } break; /*-----------------------------------------------------------------*/ case OP_DOLLM: if ((mb->moptions & PCRE2_NOTEOL) == 0) { if (clen == 0 && (mb->moptions & PCRE2_PARTIAL_HARD) != 0) could_continue = TRUE; else if (clen == 0 || ((mb->poptions & PCRE2_DOLLAR_ENDONLY) == 0 && IS_NEWLINE(ptr))) { ADD_ACTIVE(state_offset + 1, 0); } else if (ptr + 1 >= mb->end_subject && (mb->moptions & (PCRE2_PARTIAL_HARD|PCRE2_PARTIAL_SOFT)) != 0 && NLBLOCK->nltype == NLTYPE_FIXED && NLBLOCK->nllen == 2 && c == NLBLOCK->nl[0]) { if ((mb->moptions & PCRE2_PARTIAL_HARD) != 0) { reset_could_continue = TRUE; ADD_NEW_DATA(-(state_offset + 1), 0, 1); } else could_continue = partial_newline = TRUE; } } else if (IS_NEWLINE(ptr)) { ADD_ACTIVE(state_offset + 1, 0); } break; /*-----------------------------------------------------------------*/ case OP_DIGIT: case OP_WHITESPACE: case OP_WORDCHAR: if (clen > 0 && c < 256 && ((ctypes[c] & toptable1[codevalue]) ^ toptable2[codevalue]) != 0) { ADD_NEW(state_offset + 1, 0); } break; /*-----------------------------------------------------------------*/ case OP_NOT_DIGIT: case OP_NOT_WHITESPACE: case OP_NOT_WORDCHAR: if (clen > 0 && (c >= 256 || ((ctypes[c] & toptable1[codevalue]) ^ toptable2[codevalue]) != 0)) { ADD_NEW(state_offset + 1, 0); } break; /*-----------------------------------------------------------------*/ case OP_WORD_BOUNDARY: case OP_NOT_WORD_BOUNDARY: { int left_word, right_word; if (ptr > start_subject) { PCRE2_SPTR temp = ptr - 1; if (temp < mb->start_used_ptr) mb->start_used_ptr = temp; #if defined SUPPORT_UNICODE && PCRE2_CODE_UNIT_WIDTH != 32 if (utf) { BACKCHAR(temp); } #endif GETCHARTEST(d, temp); #ifdef SUPPORT_UNICODE if ((mb->poptions & PCRE2_UCP) != 0) { if (d == '_') left_word = TRUE; else { uint32_t cat = UCD_CATEGORY(d); left_word = (cat == ucp_L || cat == ucp_N); } } else #endif left_word = d < 256 && (ctypes[d] & ctype_word) != 0; } else left_word = FALSE; if (clen > 0) { if (ptr >= mb->last_used_ptr) { PCRE2_SPTR temp = ptr + 1; #if defined SUPPORT_UNICODE && PCRE2_CODE_UNIT_WIDTH != 32 if (utf) { FORWARDCHARTEST(temp, mb->end_subject); } #endif mb->last_used_ptr = temp; } #ifdef SUPPORT_UNICODE if ((mb->poptions & PCRE2_UCP) != 0) { if (c == '_') right_word = TRUE; else { uint32_t cat = UCD_CATEGORY(c); right_word = (cat == ucp_L || cat == ucp_N); } } else #endif right_word = c < 256 && (ctypes[c] & ctype_word) != 0; } else right_word = FALSE; if ((left_word == right_word) == (codevalue == OP_NOT_WORD_BOUNDARY)) { ADD_ACTIVE(state_offset + 1, 0); } } break; /*-----------------------------------------------------------------*/ /* Check the next character by Unicode property. We will get here only if the support is in the binary; otherwise a compile-time error occurs. */ #ifdef SUPPORT_UNICODE case OP_PROP: case OP_NOTPROP: if (clen > 0) { BOOL OK; const uint32_t *cp; const ucd_record * prop = GET_UCD(c); switch(code[1]) { case PT_ANY: OK = TRUE; break; case PT_LAMP: OK = prop->chartype == ucp_Lu || prop->chartype == ucp_Ll || prop->chartype == ucp_Lt; break; case PT_GC: OK = PRIV(ucp_gentype)[prop->chartype] == code[2]; break; case PT_PC: OK = prop->chartype == code[2]; break; case PT_SC: OK = prop->script == code[2]; break; /* These are specials for combination cases. */ case PT_ALNUM: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_L || PRIV(ucp_gentype)[prop->chartype] == ucp_N; break; /* Perl space used to exclude VT, but from Perl 5.18 it is included, which means that Perl space and POSIX space are now identical. PCRE was changed at release 8.34. */ case PT_SPACE: /* Perl space */ case PT_PXSPACE: /* POSIX space */ switch(c) { HSPACE_CASES: VSPACE_CASES: OK = TRUE; break; default: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_Z; break; } break; case PT_WORD: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_L || PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE; break; case PT_CLIST: cp = PRIV(ucd_caseless_sets) + code[2]; for (;;) { if (c < *cp) { OK = FALSE; break; } if (c == *cp++) { OK = TRUE; break; } } break; case PT_UCNC: OK = c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT || c == CHAR_GRAVE_ACCENT || (c >= 0xa0 && c <= 0xd7ff) || c >= 0xe000; break; /* Should never occur, but keep compilers from grumbling. */ default: OK = codevalue != OP_PROP; break; } if (OK == (codevalue == OP_PROP)) { ADD_NEW(state_offset + 3, 0); } } break; #endif /* ========================================================================== */ /* These opcodes likewise inspect the subject character, but have an argument that is not a data character. It is one of these opcodes: OP_ANY, OP_ALLANY, OP_DIGIT, OP_NOT_DIGIT, OP_WHITESPACE, OP_NOT_SPACE, OP_WORDCHAR, OP_NOT_WORDCHAR. The value is loaded into d. */ case OP_TYPEPLUS: case OP_TYPEMINPLUS: case OP_TYPEPOSPLUS: count = current_state->count; /* Already matched */ if (count > 0) { ADD_ACTIVE(state_offset + 2, 0); } if (clen > 0) { if (d == OP_ANY && ptr + 1 >= mb->end_subject && (mb->moptions & (PCRE2_PARTIAL_HARD)) != 0 && NLBLOCK->nltype == NLTYPE_FIXED && NLBLOCK->nllen == 2 && c == NLBLOCK->nl[0]) { could_continue = partial_newline = TRUE; } else if ((c >= 256 && d != OP_DIGIT && d != OP_WHITESPACE && d != OP_WORDCHAR) || (c < 256 && (d != OP_ANY || !IS_NEWLINE(ptr)) && ((ctypes[c] & toptable1[d]) ^ toptable2[d]) != 0)) { if (count > 0 && codevalue == OP_TYPEPOSPLUS) { active_count--; /* Remove non-match possibility */ next_active_state--; } count++; ADD_NEW(state_offset, count); } } break; /*-----------------------------------------------------------------*/ case OP_TYPEQUERY: case OP_TYPEMINQUERY: case OP_TYPEPOSQUERY: ADD_ACTIVE(state_offset + 2, 0); if (clen > 0) { if (d == OP_ANY && ptr + 1 >= mb->end_subject && (mb->moptions & (PCRE2_PARTIAL_HARD)) != 0 && NLBLOCK->nltype == NLTYPE_FIXED && NLBLOCK->nllen == 2 && c == NLBLOCK->nl[0]) { could_continue = partial_newline = TRUE; } else if ((c >= 256 && d != OP_DIGIT && d != OP_WHITESPACE && d != OP_WORDCHAR) || (c < 256 && (d != OP_ANY || !IS_NEWLINE(ptr)) && ((ctypes[c] & toptable1[d]) ^ toptable2[d]) != 0)) { if (codevalue == OP_TYPEPOSQUERY) { active_count--; /* Remove non-match possibility */ next_active_state--; } ADD_NEW(state_offset + 2, 0); } } break; /*-----------------------------------------------------------------*/ case OP_TYPESTAR: case OP_TYPEMINSTAR: case OP_TYPEPOSSTAR: ADD_ACTIVE(state_offset + 2, 0); if (clen > 0) { if (d == OP_ANY && ptr + 1 >= mb->end_subject && (mb->moptions & (PCRE2_PARTIAL_HARD)) != 0 && NLBLOCK->nltype == NLTYPE_FIXED && NLBLOCK->nllen == 2 && c == NLBLOCK->nl[0]) { could_continue = partial_newline = TRUE; } else if ((c >= 256 && d != OP_DIGIT && d != OP_WHITESPACE && d != OP_WORDCHAR) || (c < 256 && (d != OP_ANY || !IS_NEWLINE(ptr)) && ((ctypes[c] & toptable1[d]) ^ toptable2[d]) != 0)) { if (codevalue == OP_TYPEPOSSTAR) { active_count--; /* Remove non-match possibility */ next_active_state--; } ADD_NEW(state_offset, 0); } } break; /*-----------------------------------------------------------------*/ case OP_TYPEEXACT: count = current_state->count; /* Number already matched */ if (clen > 0) { if (d == OP_ANY && ptr + 1 >= mb->end_subject && (mb->moptions & (PCRE2_PARTIAL_HARD)) != 0 && NLBLOCK->nltype == NLTYPE_FIXED && NLBLOCK->nllen == 2 && c == NLBLOCK->nl[0]) { could_continue = partial_newline = TRUE; } else if ((c >= 256 && d != OP_DIGIT && d != OP_WHITESPACE && d != OP_WORDCHAR) || (c < 256 && (d != OP_ANY || !IS_NEWLINE(ptr)) && ((ctypes[c] & toptable1[d]) ^ toptable2[d]) != 0)) { if (++count >= (int)GET2(code, 1)) { ADD_NEW(state_offset + 1 + IMM2_SIZE + 1, 0); } else { ADD_NEW(state_offset, count); } } } break; /*-----------------------------------------------------------------*/ case OP_TYPEUPTO: case OP_TYPEMINUPTO: case OP_TYPEPOSUPTO: ADD_ACTIVE(state_offset + 2 + IMM2_SIZE, 0); count = current_state->count; /* Number already matched */ if (clen > 0) { if (d == OP_ANY && ptr + 1 >= mb->end_subject && (mb->moptions & (PCRE2_PARTIAL_HARD)) != 0 && NLBLOCK->nltype == NLTYPE_FIXED && NLBLOCK->nllen == 2 && c == NLBLOCK->nl[0]) { could_continue = partial_newline = TRUE; } else if ((c >= 256 && d != OP_DIGIT && d != OP_WHITESPACE && d != OP_WORDCHAR) || (c < 256 && (d != OP_ANY || !IS_NEWLINE(ptr)) && ((ctypes[c] & toptable1[d]) ^ toptable2[d]) != 0)) { if (codevalue == OP_TYPEPOSUPTO) { active_count--; /* Remove non-match possibility */ next_active_state--; } if (++count >= (int)GET2(code, 1)) { ADD_NEW(state_offset + 2 + IMM2_SIZE, 0); } else { ADD_NEW(state_offset, count); } } } break; /* ========================================================================== */ /* These are virtual opcodes that are used when something like OP_TYPEPLUS has OP_PROP, OP_NOTPROP, OP_ANYNL, or OP_EXTUNI as its argument. It keeps the code above fast for the other cases. The argument is in the d variable. */ #ifdef SUPPORT_UNICODE case OP_PROP_EXTRA + OP_TYPEPLUS: case OP_PROP_EXTRA + OP_TYPEMINPLUS: case OP_PROP_EXTRA + OP_TYPEPOSPLUS: count = current_state->count; /* Already matched */ if (count > 0) { ADD_ACTIVE(state_offset + 4, 0); } if (clen > 0) { BOOL OK; const uint32_t *cp; const ucd_record * prop = GET_UCD(c); switch(code[2]) { case PT_ANY: OK = TRUE; break; case PT_LAMP: OK = prop->chartype == ucp_Lu || prop->chartype == ucp_Ll || prop->chartype == ucp_Lt; break; case PT_GC: OK = PRIV(ucp_gentype)[prop->chartype] == code[3]; break; case PT_PC: OK = prop->chartype == code[3]; break; case PT_SC: OK = prop->script == code[3]; break; /* These are specials for combination cases. */ case PT_ALNUM: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_L || PRIV(ucp_gentype)[prop->chartype] == ucp_N; break; /* Perl space used to exclude VT, but from Perl 5.18 it is included, which means that Perl space and POSIX space are now identical. PCRE was changed at release 8.34. */ case PT_SPACE: /* Perl space */ case PT_PXSPACE: /* POSIX space */ switch(c) { HSPACE_CASES: VSPACE_CASES: OK = TRUE; break; default: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_Z; break; } break; case PT_WORD: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_L || PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE; break; case PT_CLIST: cp = PRIV(ucd_caseless_sets) + code[3]; for (;;) { if (c < *cp) { OK = FALSE; break; } if (c == *cp++) { OK = TRUE; break; } } break; case PT_UCNC: OK = c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT || c == CHAR_GRAVE_ACCENT || (c >= 0xa0 && c <= 0xd7ff) || c >= 0xe000; break; /* Should never occur, but keep compilers from grumbling. */ default: OK = codevalue != OP_PROP; break; } if (OK == (d == OP_PROP)) { if (count > 0 && codevalue == OP_PROP_EXTRA + OP_TYPEPOSPLUS) { active_count--; /* Remove non-match possibility */ next_active_state--; } count++; ADD_NEW(state_offset, count); } } break; /*-----------------------------------------------------------------*/ case OP_EXTUNI_EXTRA + OP_TYPEPLUS: case OP_EXTUNI_EXTRA + OP_TYPEMINPLUS: case OP_EXTUNI_EXTRA + OP_TYPEPOSPLUS: count = current_state->count; /* Already matched */ if (count > 0) { ADD_ACTIVE(state_offset + 2, 0); } if (clen > 0) { int ncount = 0; if (count > 0 && codevalue == OP_EXTUNI_EXTRA + OP_TYPEPOSPLUS) { active_count--; /* Remove non-match possibility */ next_active_state--; } (void)PRIV(extuni)(c, ptr + clen, mb->start_subject, end_subject, utf, &ncount); count++; ADD_NEW_DATA(-state_offset, count, ncount); } break; #endif /*-----------------------------------------------------------------*/ case OP_ANYNL_EXTRA + OP_TYPEPLUS: case OP_ANYNL_EXTRA + OP_TYPEMINPLUS: case OP_ANYNL_EXTRA + OP_TYPEPOSPLUS: count = current_state->count; /* Already matched */ if (count > 0) { ADD_ACTIVE(state_offset + 2, 0); } if (clen > 0) { int ncount = 0; switch (c) { case CHAR_VT: case CHAR_FF: case CHAR_NEL: #ifndef EBCDIC case 0x2028: case 0x2029: #endif /* Not EBCDIC */ if (mb->bsr_convention == PCRE2_BSR_ANYCRLF) break; goto ANYNL01; case CHAR_CR: if (ptr + 1 < end_subject && UCHAR21TEST(ptr + 1) == CHAR_LF) ncount = 1; /* Fall through */ ANYNL01: case CHAR_LF: if (count > 0 && codevalue == OP_ANYNL_EXTRA + OP_TYPEPOSPLUS) { active_count--; /* Remove non-match possibility */ next_active_state--; } count++; ADD_NEW_DATA(-state_offset, count, ncount); break; default: break; } } break; /*-----------------------------------------------------------------*/ case OP_VSPACE_EXTRA + OP_TYPEPLUS: case OP_VSPACE_EXTRA + OP_TYPEMINPLUS: case OP_VSPACE_EXTRA + OP_TYPEPOSPLUS: count = current_state->count; /* Already matched */ if (count > 0) { ADD_ACTIVE(state_offset + 2, 0); } if (clen > 0) { BOOL OK; switch (c) { VSPACE_CASES: OK = TRUE; break; default: OK = FALSE; break; } if (OK == (d == OP_VSPACE)) { if (count > 0 && codevalue == OP_VSPACE_EXTRA + OP_TYPEPOSPLUS) { active_count--; /* Remove non-match possibility */ next_active_state--; } count++; ADD_NEW_DATA(-state_offset, count, 0); } } break; /*-----------------------------------------------------------------*/ case OP_HSPACE_EXTRA + OP_TYPEPLUS: case OP_HSPACE_EXTRA + OP_TYPEMINPLUS: case OP_HSPACE_EXTRA + OP_TYPEPOSPLUS: count = current_state->count; /* Already matched */ if (count > 0) { ADD_ACTIVE(state_offset + 2, 0); } if (clen > 0) { BOOL OK; switch (c) { HSPACE_CASES: OK = TRUE; break; default: OK = FALSE; break; } if (OK == (d == OP_HSPACE)) { if (count > 0 && codevalue == OP_HSPACE_EXTRA + OP_TYPEPOSPLUS) { active_count--; /* Remove non-match possibility */ next_active_state--; } count++; ADD_NEW_DATA(-state_offset, count, 0); } } break; /*-----------------------------------------------------------------*/ #ifdef SUPPORT_UNICODE case OP_PROP_EXTRA + OP_TYPEQUERY: case OP_PROP_EXTRA + OP_TYPEMINQUERY: case OP_PROP_EXTRA + OP_TYPEPOSQUERY: count = 4; goto QS1; case OP_PROP_EXTRA + OP_TYPESTAR: case OP_PROP_EXTRA + OP_TYPEMINSTAR: case OP_PROP_EXTRA + OP_TYPEPOSSTAR: count = 0; QS1: ADD_ACTIVE(state_offset + 4, 0); if (clen > 0) { BOOL OK; const uint32_t *cp; const ucd_record * prop = GET_UCD(c); switch(code[2]) { case PT_ANY: OK = TRUE; break; case PT_LAMP: OK = prop->chartype == ucp_Lu || prop->chartype == ucp_Ll || prop->chartype == ucp_Lt; break; case PT_GC: OK = PRIV(ucp_gentype)[prop->chartype] == code[3]; break; case PT_PC: OK = prop->chartype == code[3]; break; case PT_SC: OK = prop->script == code[3]; break; /* These are specials for combination cases. */ case PT_ALNUM: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_L || PRIV(ucp_gentype)[prop->chartype] == ucp_N; break; /* Perl space used to exclude VT, but from Perl 5.18 it is included, which means that Perl space and POSIX space are now identical. PCRE was changed at release 8.34. */ case PT_SPACE: /* Perl space */ case PT_PXSPACE: /* POSIX space */ switch(c) { HSPACE_CASES: VSPACE_CASES: OK = TRUE; break; default: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_Z; break; } break; case PT_WORD: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_L || PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE; break; case PT_CLIST: cp = PRIV(ucd_caseless_sets) + code[3]; for (;;) { if (c < *cp) { OK = FALSE; break; } if (c == *cp++) { OK = TRUE; break; } } break; case PT_UCNC: OK = c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT || c == CHAR_GRAVE_ACCENT || (c >= 0xa0 && c <= 0xd7ff) || c >= 0xe000; break; /* Should never occur, but keep compilers from grumbling. */ default: OK = codevalue != OP_PROP; break; } if (OK == (d == OP_PROP)) { if (codevalue == OP_PROP_EXTRA + OP_TYPEPOSSTAR || codevalue == OP_PROP_EXTRA + OP_TYPEPOSQUERY) { active_count--; /* Remove non-match possibility */ next_active_state--; } ADD_NEW(state_offset + count, 0); } } break; /*-----------------------------------------------------------------*/ case OP_EXTUNI_EXTRA + OP_TYPEQUERY: case OP_EXTUNI_EXTRA + OP_TYPEMINQUERY: case OP_EXTUNI_EXTRA + OP_TYPEPOSQUERY: count = 2; goto QS2; case OP_EXTUNI_EXTRA + OP_TYPESTAR: case OP_EXTUNI_EXTRA + OP_TYPEMINSTAR: case OP_EXTUNI_EXTRA + OP_TYPEPOSSTAR: count = 0; QS2: ADD_ACTIVE(state_offset + 2, 0); if (clen > 0) { int ncount = 0; if (codevalue == OP_EXTUNI_EXTRA + OP_TYPEPOSSTAR || codevalue == OP_EXTUNI_EXTRA + OP_TYPEPOSQUERY) { active_count--; /* Remove non-match possibility */ next_active_state--; } (void)PRIV(extuni)(c, ptr + clen, mb->start_subject, end_subject, utf, &ncount); ADD_NEW_DATA(-(state_offset + count), 0, ncount); } break; #endif /*-----------------------------------------------------------------*/ case OP_ANYNL_EXTRA + OP_TYPEQUERY: case OP_ANYNL_EXTRA + OP_TYPEMINQUERY: case OP_ANYNL_EXTRA + OP_TYPEPOSQUERY: count = 2; goto QS3; case OP_ANYNL_EXTRA + OP_TYPESTAR: case OP_ANYNL_EXTRA + OP_TYPEMINSTAR: case OP_ANYNL_EXTRA + OP_TYPEPOSSTAR: count = 0; QS3: ADD_ACTIVE(state_offset + 2, 0); if (clen > 0) { int ncount = 0; switch (c) { case CHAR_VT: case CHAR_FF: case CHAR_NEL: #ifndef EBCDIC case 0x2028: case 0x2029: #endif /* Not EBCDIC */ if (mb->bsr_convention == PCRE2_BSR_ANYCRLF) break; goto ANYNL02; case CHAR_CR: if (ptr + 1 < end_subject && UCHAR21TEST(ptr + 1) == CHAR_LF) ncount = 1; /* Fall through */ ANYNL02: case CHAR_LF: if (codevalue == OP_ANYNL_EXTRA + OP_TYPEPOSSTAR || codevalue == OP_ANYNL_EXTRA + OP_TYPEPOSQUERY) { active_count--; /* Remove non-match possibility */ next_active_state--; } ADD_NEW_DATA(-(state_offset + (int)count), 0, ncount); break; default: break; } } break; /*-----------------------------------------------------------------*/ case OP_VSPACE_EXTRA + OP_TYPEQUERY: case OP_VSPACE_EXTRA + OP_TYPEMINQUERY: case OP_VSPACE_EXTRA + OP_TYPEPOSQUERY: count = 2; goto QS4; case OP_VSPACE_EXTRA + OP_TYPESTAR: case OP_VSPACE_EXTRA + OP_TYPEMINSTAR: case OP_VSPACE_EXTRA + OP_TYPEPOSSTAR: count = 0; QS4: ADD_ACTIVE(state_offset + 2, 0); if (clen > 0) { BOOL OK; switch (c) { VSPACE_CASES: OK = TRUE; break; default: OK = FALSE; break; } if (OK == (d == OP_VSPACE)) { if (codevalue == OP_VSPACE_EXTRA + OP_TYPEPOSSTAR || codevalue == OP_VSPACE_EXTRA + OP_TYPEPOSQUERY) { active_count--; /* Remove non-match possibility */ next_active_state--; } ADD_NEW_DATA(-(state_offset + (int)count), 0, 0); } } break; /*-----------------------------------------------------------------*/ case OP_HSPACE_EXTRA + OP_TYPEQUERY: case OP_HSPACE_EXTRA + OP_TYPEMINQUERY: case OP_HSPACE_EXTRA + OP_TYPEPOSQUERY: count = 2; goto QS5; case OP_HSPACE_EXTRA + OP_TYPESTAR: case OP_HSPACE_EXTRA + OP_TYPEMINSTAR: case OP_HSPACE_EXTRA + OP_TYPEPOSSTAR: count = 0; QS5: ADD_ACTIVE(state_offset + 2, 0); if (clen > 0) { BOOL OK; switch (c) { HSPACE_CASES: OK = TRUE; break; default: OK = FALSE; break; } if (OK == (d == OP_HSPACE)) { if (codevalue == OP_HSPACE_EXTRA + OP_TYPEPOSSTAR || codevalue == OP_HSPACE_EXTRA + OP_TYPEPOSQUERY) { active_count--; /* Remove non-match possibility */ next_active_state--; } ADD_NEW_DATA(-(state_offset + (int)count), 0, 0); } } break; /*-----------------------------------------------------------------*/ #ifdef SUPPORT_UNICODE case OP_PROP_EXTRA + OP_TYPEEXACT: case OP_PROP_EXTRA + OP_TYPEUPTO: case OP_PROP_EXTRA + OP_TYPEMINUPTO: case OP_PROP_EXTRA + OP_TYPEPOSUPTO: if (codevalue != OP_PROP_EXTRA + OP_TYPEEXACT) { ADD_ACTIVE(state_offset + 1 + IMM2_SIZE + 3, 0); } count = current_state->count; /* Number already matched */ if (clen > 0) { BOOL OK; const uint32_t *cp; const ucd_record * prop = GET_UCD(c); switch(code[1 + IMM2_SIZE + 1]) { case PT_ANY: OK = TRUE; break; case PT_LAMP: OK = prop->chartype == ucp_Lu || prop->chartype == ucp_Ll || prop->chartype == ucp_Lt; break; case PT_GC: OK = PRIV(ucp_gentype)[prop->chartype] == code[1 + IMM2_SIZE + 2]; break; case PT_PC: OK = prop->chartype == code[1 + IMM2_SIZE + 2]; break; case PT_SC: OK = prop->script == code[1 + IMM2_SIZE + 2]; break; /* These are specials for combination cases. */ case PT_ALNUM: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_L || PRIV(ucp_gentype)[prop->chartype] == ucp_N; break; /* Perl space used to exclude VT, but from Perl 5.18 it is included, which means that Perl space and POSIX space are now identical. PCRE was changed at release 8.34. */ case PT_SPACE: /* Perl space */ case PT_PXSPACE: /* POSIX space */ switch(c) { HSPACE_CASES: VSPACE_CASES: OK = TRUE; break; default: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_Z; break; } break; case PT_WORD: OK = PRIV(ucp_gentype)[prop->chartype] == ucp_L || PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE; break; case PT_CLIST: cp = PRIV(ucd_caseless_sets) + code[1 + IMM2_SIZE + 2]; for (;;) { if (c < *cp) { OK = FALSE; break; } if (c == *cp++) { OK = TRUE; break; } } break; case PT_UCNC: OK = c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT || c == CHAR_GRAVE_ACCENT || (c >= 0xa0 && c <= 0xd7ff) || c >= 0xe000; break; /* Should never occur, but keep compilers from grumbling. */ default: OK = codevalue != OP_PROP; break; } if (OK == (d == OP_PROP)) { if (codevalue == OP_PROP_EXTRA + OP_TYPEPOSUPTO) { active_count--; /* Remove non-match possibility */ next_active_state--; } if (++count >= (int)GET2(code, 1)) { ADD_NEW(state_offset + 1 + IMM2_SIZE + 3, 0); } else { ADD_NEW(state_offset, count); } } } break; /*-----------------------------------------------------------------*/ case OP_EXTUNI_EXTRA + OP_TYPEEXACT: case OP_EXTUNI_EXTRA + OP_TYPEUPTO: case OP_EXTUNI_EXTRA + OP_TYPEMINUPTO: case OP_EXTUNI_EXTRA + OP_TYPEPOSUPTO: if (codevalue != OP_EXTUNI_EXTRA + OP_TYPEEXACT) { ADD_ACTIVE(state_offset + 2 + IMM2_SIZE, 0); } count = current_state->count; /* Number already matched */ if (clen > 0) { PCRE2_SPTR nptr; int ncount = 0; if (codevalue == OP_EXTUNI_EXTRA + OP_TYPEPOSUPTO) { active_count--; /* Remove non-match possibility */ next_active_state--; } nptr = PRIV(extuni)(c, ptr + clen, mb->start_subject, end_subject, utf, &ncount); if (nptr >= end_subject && (mb->moptions & PCRE2_PARTIAL_HARD) != 0) reset_could_continue = TRUE; if (++count >= (int)GET2(code, 1)) { ADD_NEW_DATA(-(state_offset + 2 + IMM2_SIZE), 0, ncount); } else { ADD_NEW_DATA(-state_offset, count, ncount); } } break; #endif /*-----------------------------------------------------------------*/ case OP_ANYNL_EXTRA + OP_TYPEEXACT: case OP_ANYNL_EXTRA + OP_TYPEUPTO: case OP_ANYNL_EXTRA + OP_TYPEMINUPTO: case OP_ANYNL_EXTRA + OP_TYPEPOSUPTO: if (codevalue != OP_ANYNL_EXTRA + OP_TYPEEXACT) { ADD_ACTIVE(state_offset + 2 + IMM2_SIZE, 0); } count = current_state->count; /* Number already matched */ if (clen > 0) { int ncount = 0; switch (c) { case CHAR_VT: case CHAR_FF: case CHAR_NEL: #ifndef EBCDIC case 0x2028: case 0x2029: #endif /* Not EBCDIC */ if (mb->bsr_convention == PCRE2_BSR_ANYCRLF) break; goto ANYNL03; case CHAR_CR: if (ptr + 1 < end_subject && UCHAR21TEST(ptr + 1) == CHAR_LF) ncount = 1; /* Fall through */ ANYNL03: case CHAR_LF: if (codevalue == OP_ANYNL_EXTRA + OP_TYPEPOSUPTO) { active_count--; /* Remove non-match possibility */ next_active_state--; } if (++count >= (int)GET2(code, 1)) { ADD_NEW_DATA(-(state_offset + 2 + IMM2_SIZE), 0, ncount); } else { ADD_NEW_DATA(-state_offset, count, ncount); } break; default: break; } } break; /*-----------------------------------------------------------------*/ case OP_VSPACE_EXTRA + OP_TYPEEXACT: case OP_VSPACE_EXTRA + OP_TYPEUPTO: case OP_VSPACE_EXTRA + OP_TYPEMINUPTO: case OP_VSPACE_EXTRA + OP_TYPEPOSUPTO: if (codevalue != OP_VSPACE_EXTRA + OP_TYPEEXACT) { ADD_ACTIVE(state_offset + 2 + IMM2_SIZE, 0); } count = current_state->count; /* Number already matched */ if (clen > 0) { BOOL OK; switch (c) { VSPACE_CASES: OK = TRUE; break; default: OK = FALSE; } if (OK == (d == OP_VSPACE)) { if (codevalue == OP_VSPACE_EXTRA + OP_TYPEPOSUPTO) { active_count--; /* Remove non-match possibility */ next_active_state--; } if (++count >= (int)GET2(code, 1)) { ADD_NEW_DATA(-(state_offset + 2 + IMM2_SIZE), 0, 0); } else { ADD_NEW_DATA(-state_offset, count, 0); } } } break; /*-----------------------------------------------------------------*/ case OP_HSPACE_EXTRA + OP_TYPEEXACT: case OP_HSPACE_EXTRA + OP_TYPEUPTO: case OP_HSPACE_EXTRA + OP_TYPEMINUPTO: case OP_HSPACE_EXTRA + OP_TYPEPOSUPTO: if (codevalue != OP_HSPACE_EXTRA + OP_TYPEEXACT) { ADD_ACTIVE(state_offset + 2 + IMM2_SIZE, 0); } count = current_state->count; /* Number already matched */ if (clen > 0) { BOOL OK; switch (c) { HSPACE_CASES: OK = TRUE; break; default: OK = FALSE; break; } if (OK == (d == OP_HSPACE)) { if (codevalue == OP_HSPACE_EXTRA + OP_TYPEPOSUPTO) { active_count--; /* Remove non-match possibility */ next_active_state--; } if (++count >= (int)GET2(code, 1)) { ADD_NEW_DATA(-(state_offset + 2 + IMM2_SIZE), 0, 0); } else { ADD_NEW_DATA(-state_offset, count, 0); } } } break; /* ========================================================================== */ /* These opcodes are followed by a character that is usually compared to the current subject character; it is loaded into d. We still get here even if there is no subject character, because in some cases zero repetitions are permitted. */ /*-----------------------------------------------------------------*/ case OP_CHAR: if (clen > 0 && c == d) { ADD_NEW(state_offset + dlen + 1, 0); } break; /*-----------------------------------------------------------------*/ case OP_CHARI: if (clen == 0) break; #ifdef SUPPORT_UNICODE if (utf) { if (c == d) { ADD_NEW(state_offset + dlen + 1, 0); } else { unsigned int othercase; if (c < 128) othercase = fcc[c]; else othercase = UCD_OTHERCASE(c); if (d == othercase) { ADD_NEW(state_offset + dlen + 1, 0); } } } else #endif /* SUPPORT_UNICODE */ /* Not UTF mode */ { if (TABLE_GET(c, lcc, c) == TABLE_GET(d, lcc, d)) { ADD_NEW(state_offset + 2, 0); } } break; #ifdef SUPPORT_UNICODE /*-----------------------------------------------------------------*/ /* This is a tricky one because it can match more than one character. Find out how many characters to skip, and then set up a negative state to wait for them to pass before continuing. */ case OP_EXTUNI: if (clen > 0) { int ncount = 0; PCRE2_SPTR nptr = PRIV(extuni)(c, ptr + clen, mb->start_subject, end_subject, utf, &ncount); if (nptr >= end_subject && (mb->moptions & PCRE2_PARTIAL_HARD) != 0) reset_could_continue = TRUE; ADD_NEW_DATA(-(state_offset + 1), 0, ncount); } break; #endif /*-----------------------------------------------------------------*/ /* This is a tricky like EXTUNI because it too can match more than one character (when CR is followed by LF). In this case, set up a negative state to wait for one character to pass before continuing. */ case OP_ANYNL: if (clen > 0) switch(c) { case CHAR_VT: case CHAR_FF: case CHAR_NEL: #ifndef EBCDIC case 0x2028: case 0x2029: #endif /* Not EBCDIC */ if (mb->bsr_convention == PCRE2_BSR_ANYCRLF) break; /* Fall through */ case CHAR_LF: ADD_NEW(state_offset + 1, 0); break; case CHAR_CR: if (ptr + 1 >= end_subject) { ADD_NEW(state_offset + 1, 0); if ((mb->moptions & PCRE2_PARTIAL_HARD) != 0) reset_could_continue = TRUE; } else if (UCHAR21TEST(ptr + 1) == CHAR_LF) { ADD_NEW_DATA(-(state_offset + 1), 0, 1); } else { ADD_NEW(state_offset + 1, 0); } break; } break; /*-----------------------------------------------------------------*/ case OP_NOT_VSPACE: if (clen > 0) switch(c) { VSPACE_CASES: break; default: ADD_NEW(state_offset + 1, 0); break; } break; /*-----------------------------------------------------------------*/ case OP_VSPACE: if (clen > 0) switch(c) { VSPACE_CASES: ADD_NEW(state_offset + 1, 0); break; default: break; } break; /*-----------------------------------------------------------------*/ case OP_NOT_HSPACE: if (clen > 0) switch(c) { HSPACE_CASES: break; default: ADD_NEW(state_offset + 1, 0); break; } break; /*-----------------------------------------------------------------*/ case OP_HSPACE: if (clen > 0) switch(c) { HSPACE_CASES: ADD_NEW(state_offset + 1, 0); break; default: break; } break; /*-----------------------------------------------------------------*/ /* Match a negated single character casefully. */ case OP_NOT: if (clen > 0 && c != d) { ADD_NEW(state_offset + dlen + 1, 0); } break; /*-----------------------------------------------------------------*/ /* Match a negated single character caselessly. */ case OP_NOTI: if (clen > 0) { uint32_t otherd; #ifdef SUPPORT_UNICODE if (utf && d >= 128) otherd = UCD_OTHERCASE(d); else #endif /* SUPPORT_UNICODE */ otherd = TABLE_GET(d, fcc, d); if (c != d && c != otherd) { ADD_NEW(state_offset + dlen + 1, 0); } } break; /*-----------------------------------------------------------------*/ case OP_PLUSI: case OP_MINPLUSI: case OP_POSPLUSI: case OP_NOTPLUSI: case OP_NOTMINPLUSI: case OP_NOTPOSPLUSI: caseless = TRUE; codevalue -= OP_STARI - OP_STAR; /* Fall through */ case OP_PLUS: case OP_MINPLUS: case OP_POSPLUS: case OP_NOTPLUS: case OP_NOTMINPLUS: case OP_NOTPOSPLUS: count = current_state->count; /* Already matched */ if (count > 0) { ADD_ACTIVE(state_offset + dlen + 1, 0); } if (clen > 0) { uint32_t otherd = NOTACHAR; if (caseless) { #ifdef SUPPORT_UNICODE if (utf && d >= 128) otherd = UCD_OTHERCASE(d); else #endif /* SUPPORT_UNICODE */ otherd = TABLE_GET(d, fcc, d); } if ((c == d || c == otherd) == (codevalue < OP_NOTSTAR)) { if (count > 0 && (codevalue == OP_POSPLUS || codevalue == OP_NOTPOSPLUS)) { active_count--; /* Remove non-match possibility */ next_active_state--; } count++; ADD_NEW(state_offset, count); } } break; /*-----------------------------------------------------------------*/ case OP_QUERYI: case OP_MINQUERYI: case OP_POSQUERYI: case OP_NOTQUERYI: case OP_NOTMINQUERYI: case OP_NOTPOSQUERYI: caseless = TRUE; codevalue -= OP_STARI - OP_STAR; /* Fall through */ case OP_QUERY: case OP_MINQUERY: case OP_POSQUERY: case OP_NOTQUERY: case OP_NOTMINQUERY: case OP_NOTPOSQUERY: ADD_ACTIVE(state_offset + dlen + 1, 0); if (clen > 0) { uint32_t otherd = NOTACHAR; if (caseless) { #ifdef SUPPORT_UNICODE if (utf && d >= 128) otherd = UCD_OTHERCASE(d); else #endif /* SUPPORT_UNICODE */ otherd = TABLE_GET(d, fcc, d); } if ((c == d || c == otherd) == (codevalue < OP_NOTSTAR)) { if (codevalue == OP_POSQUERY || codevalue == OP_NOTPOSQUERY) { active_count--; /* Remove non-match possibility */ next_active_state--; } ADD_NEW(state_offset + dlen + 1, 0); } } break; /*-----------------------------------------------------------------*/ case OP_STARI: case OP_MINSTARI: case OP_POSSTARI: case OP_NOTSTARI: case OP_NOTMINSTARI: case OP_NOTPOSSTARI: caseless = TRUE; codevalue -= OP_STARI - OP_STAR; /* Fall through */ case OP_STAR: case OP_MINSTAR: case OP_POSSTAR: case OP_NOTSTAR: case OP_NOTMINSTAR: case OP_NOTPOSSTAR: ADD_ACTIVE(state_offset + dlen + 1, 0); if (clen > 0) { uint32_t otherd = NOTACHAR; if (caseless) { #ifdef SUPPORT_UNICODE if (utf && d >= 128) otherd = UCD_OTHERCASE(d); else #endif /* SUPPORT_UNICODE */ otherd = TABLE_GET(d, fcc, d); } if ((c == d || c == otherd) == (codevalue < OP_NOTSTAR)) { if (codevalue == OP_POSSTAR || codevalue == OP_NOTPOSSTAR) { active_count--; /* Remove non-match possibility */ next_active_state--; } ADD_NEW(state_offset, 0); } } break; /*-----------------------------------------------------------------*/ case OP_EXACTI: case OP_NOTEXACTI: caseless = TRUE; codevalue -= OP_STARI - OP_STAR; /* Fall through */ case OP_EXACT: case OP_NOTEXACT: count = current_state->count; /* Number already matched */ if (clen > 0) { uint32_t otherd = NOTACHAR; if (caseless) { #ifdef SUPPORT_UNICODE if (utf && d >= 128) otherd = UCD_OTHERCASE(d); else #endif /* SUPPORT_UNICODE */ otherd = TABLE_GET(d, fcc, d); } if ((c == d || c == otherd) == (codevalue < OP_NOTSTAR)) { if (++count >= (int)GET2(code, 1)) { ADD_NEW(state_offset + dlen + 1 + IMM2_SIZE, 0); } else { ADD_NEW(state_offset, count); } } } break; /*-----------------------------------------------------------------*/ case OP_UPTOI: case OP_MINUPTOI: case OP_POSUPTOI: case OP_NOTUPTOI: case OP_NOTMINUPTOI: case OP_NOTPOSUPTOI: caseless = TRUE; codevalue -= OP_STARI - OP_STAR; /* Fall through */ case OP_UPTO: case OP_MINUPTO: case OP_POSUPTO: case OP_NOTUPTO: case OP_NOTMINUPTO: case OP_NOTPOSUPTO: ADD_ACTIVE(state_offset + dlen + 1 + IMM2_SIZE, 0); count = current_state->count; /* Number already matched */ if (clen > 0) { uint32_t otherd = NOTACHAR; if (caseless) { #ifdef SUPPORT_UNICODE if (utf && d >= 128) otherd = UCD_OTHERCASE(d); else #endif /* SUPPORT_UNICODE */ otherd = TABLE_GET(d, fcc, d); } if ((c == d || c == otherd) == (codevalue < OP_NOTSTAR)) { if (codevalue == OP_POSUPTO || codevalue == OP_NOTPOSUPTO) { active_count--; /* Remove non-match possibility */ next_active_state--; } if (++count >= (int)GET2(code, 1)) { ADD_NEW(state_offset + dlen + 1 + IMM2_SIZE, 0); } else { ADD_NEW(state_offset, count); } } } break; /* ========================================================================== */ /* These are the class-handling opcodes */ case OP_CLASS: case OP_NCLASS: case OP_XCLASS: { BOOL isinclass = FALSE; int next_state_offset; PCRE2_SPTR ecode; /* For a simple class, there is always just a 32-byte table, and we can set isinclass from it. */ if (codevalue != OP_XCLASS) { ecode = code + 1 + (32 / sizeof(PCRE2_UCHAR)); if (clen > 0) { isinclass = (c > 255)? (codevalue == OP_NCLASS) : ((((uint8_t *)(code + 1))[c/8] & (1 << (c&7))) != 0); } } /* An extended class may have a table or a list of single characters, ranges, or both, and it may be positive or negative. There's a function that sorts all this out. */ else { ecode = code + GET(code, 1); if (clen > 0) isinclass = PRIV(xclass)(c, code + 1 + LINK_SIZE, utf); } /* At this point, isinclass is set for all kinds of class, and ecode points to the byte after the end of the class. If there is a quantifier, this is where it will be. */ next_state_offset = (int)(ecode - start_code); switch (*ecode) { case OP_CRSTAR: case OP_CRMINSTAR: case OP_CRPOSSTAR: ADD_ACTIVE(next_state_offset + 1, 0); if (isinclass) { if (*ecode == OP_CRPOSSTAR) { active_count--; /* Remove non-match possibility */ next_active_state--; } ADD_NEW(state_offset, 0); } break; case OP_CRPLUS: case OP_CRMINPLUS: case OP_CRPOSPLUS: count = current_state->count; /* Already matched */ if (count > 0) { ADD_ACTIVE(next_state_offset + 1, 0); } if (isinclass) { if (count > 0 && *ecode == OP_CRPOSPLUS) { active_count--; /* Remove non-match possibility */ next_active_state--; } count++; ADD_NEW(state_offset, count); } break; case OP_CRQUERY: case OP_CRMINQUERY: case OP_CRPOSQUERY: ADD_ACTIVE(next_state_offset + 1, 0); if (isinclass) { if (*ecode == OP_CRPOSQUERY) { active_count--; /* Remove non-match possibility */ next_active_state--; } ADD_NEW(next_state_offset + 1, 0); } break; case OP_CRRANGE: case OP_CRMINRANGE: case OP_CRPOSRANGE: count = current_state->count; /* Already matched */ if (count >= (int)GET2(ecode, 1)) { ADD_ACTIVE(next_state_offset + 1 + 2 * IMM2_SIZE, 0); } if (isinclass) { int max = (int)GET2(ecode, 1 + IMM2_SIZE); if (*ecode == OP_CRPOSRANGE && count >= (int)GET2(ecode, 1)) { active_count--; /* Remove non-match possibility */ next_active_state--; } if (++count >= max && max != 0) /* Max 0 => no limit */ { ADD_NEW(next_state_offset + 1 + 2 * IMM2_SIZE, 0); } else { ADD_NEW(state_offset, count); } } break; default: if (isinclass) { ADD_NEW(next_state_offset, 0); } break; } } break; /* ========================================================================== */ /* These are the opcodes for fancy brackets of various kinds. We have to use recursion in order to handle them. The "always failing" assertion (?!) is optimised to OP_FAIL when compiling, so we have to support that, though the other "backtracking verbs" are not supported. */ case OP_FAIL: forced_fail++; /* Count FAILs for multiple states */ break; case OP_ASSERT: case OP_ASSERT_NOT: case OP_ASSERTBACK: case OP_ASSERTBACK_NOT: { int rc; int *local_workspace; PCRE2_SIZE *local_offsets; PCRE2_SPTR endasscode = code + GET(code, 1); RWS_anchor *rws = (RWS_anchor *)RWS; if (rws->free < RWS_RSIZE + RWS_OVEC_OSIZE) { rc = more_workspace(&rws, RWS_OVEC_OSIZE, mb); if (rc != 0) return rc; RWS = (int *)rws; } local_offsets = (PCRE2_SIZE *)(RWS + rws->size - rws->free); local_workspace = ((int *)local_offsets) + RWS_OVEC_OSIZE; rws->free -= RWS_RSIZE + RWS_OVEC_OSIZE; while (*endasscode == OP_ALT) endasscode += GET(endasscode, 1); rc = internal_dfa_match( mb, /* static match data */ code, /* this subexpression's code */ ptr, /* where we currently are */ (PCRE2_SIZE)(ptr - start_subject), /* start offset */ local_offsets, /* offset vector */ RWS_OVEC_OSIZE/OVEC_UNIT, /* size of same */ local_workspace, /* workspace vector */ RWS_RSIZE, /* size of same */ rlevel, /* function recursion level */ RWS); /* recursion workspace */ rws->free += RWS_RSIZE + RWS_OVEC_OSIZE; if (rc < 0 && rc != PCRE2_ERROR_NOMATCH) return rc; if ((rc >= 0) == (codevalue == OP_ASSERT || codevalue == OP_ASSERTBACK)) { ADD_ACTIVE((int)(endasscode + LINK_SIZE + 1 - start_code), 0); } } break; /*-----------------------------------------------------------------*/ case OP_COND: case OP_SCOND: { int codelink = (int)GET(code, 1); PCRE2_UCHAR condcode; /* Because of the way auto-callout works during compile, a callout item is inserted between OP_COND and an assertion condition. This does not happen for the other conditions. */ if (code[LINK_SIZE + 1] == OP_CALLOUT || code[LINK_SIZE + 1] == OP_CALLOUT_STR) { PCRE2_SIZE callout_length; rrc = do_callout(code, offsets, current_subject, ptr, mb, 1 + LINK_SIZE, &callout_length); if (rrc < 0) return rrc; /* Abandon */ if (rrc > 0) break; /* Fail this thread */ code += callout_length; /* Skip callout data */ } condcode = code[LINK_SIZE+1]; /* Back reference conditions and duplicate named recursion conditions are not supported */ if (condcode == OP_CREF || condcode == OP_DNCREF || condcode == OP_DNRREF) return PCRE2_ERROR_DFA_UCOND; /* The DEFINE condition is always false, and the assertion (?!) is converted to OP_FAIL. */ if (condcode == OP_FALSE || condcode == OP_FAIL) { ADD_ACTIVE(state_offset + codelink + LINK_SIZE + 1, 0); } /* There is also an always-true condition */ else if (condcode == OP_TRUE) { ADD_ACTIVE(state_offset + LINK_SIZE + 2 + IMM2_SIZE, 0); } /* The only supported version of OP_RREF is for the value RREF_ANY, which means "test if in any recursion". We can't test for specifically recursed groups. */ else if (condcode == OP_RREF) { unsigned int value = GET2(code, LINK_SIZE + 2); if (value != RREF_ANY) return PCRE2_ERROR_DFA_UCOND; if (mb->recursive != NULL) { ADD_ACTIVE(state_offset + LINK_SIZE + 2 + IMM2_SIZE, 0); } else { ADD_ACTIVE(state_offset + codelink + LINK_SIZE + 1, 0); } } /* Otherwise, the condition is an assertion */ else { int rc; int *local_workspace; PCRE2_SIZE *local_offsets; PCRE2_SPTR asscode = code + LINK_SIZE + 1; PCRE2_SPTR endasscode = asscode + GET(asscode, 1); RWS_anchor *rws = (RWS_anchor *)RWS; if (rws->free < RWS_RSIZE + RWS_OVEC_OSIZE) { rc = more_workspace(&rws, RWS_OVEC_OSIZE, mb); if (rc != 0) return rc; RWS = (int *)rws; } local_offsets = (PCRE2_SIZE *)(RWS + rws->size - rws->free); local_workspace = ((int *)local_offsets) + RWS_OVEC_OSIZE; rws->free -= RWS_RSIZE + RWS_OVEC_OSIZE; while (*endasscode == OP_ALT) endasscode += GET(endasscode, 1); rc = internal_dfa_match( mb, /* fixed match data */ asscode, /* this subexpression's code */ ptr, /* where we currently are */ (PCRE2_SIZE)(ptr - start_subject), /* start offset */ local_offsets, /* offset vector */ RWS_OVEC_OSIZE/OVEC_UNIT, /* size of same */ local_workspace, /* workspace vector */ RWS_RSIZE, /* size of same */ rlevel, /* function recursion level */ RWS); /* recursion work space */ rws->free += RWS_RSIZE + RWS_OVEC_OSIZE; if (rc < 0 && rc != PCRE2_ERROR_NOMATCH) return rc; if ((rc >= 0) == (condcode == OP_ASSERT || condcode == OP_ASSERTBACK)) { ADD_ACTIVE((int)(endasscode + LINK_SIZE + 1 - start_code), 0); } else { ADD_ACTIVE(state_offset + codelink + LINK_SIZE + 1, 0); } } } break; /*-----------------------------------------------------------------*/ case OP_RECURSE: { int rc; int *local_workspace; PCRE2_SIZE *local_offsets; RWS_anchor *rws = (RWS_anchor *)RWS; dfa_recursion_info *ri; PCRE2_SPTR callpat = start_code + GET(code, 1); uint32_t recno = (callpat == mb->start_code)? 0 : GET2(callpat, 1 + LINK_SIZE); if (rws->free < RWS_RSIZE + RWS_OVEC_RSIZE) { rc = more_workspace(&rws, RWS_OVEC_RSIZE, mb); if (rc != 0) return rc; RWS = (int *)rws; } local_offsets = (PCRE2_SIZE *)(RWS + rws->size - rws->free); local_workspace = ((int *)local_offsets) + RWS_OVEC_RSIZE; rws->free -= RWS_RSIZE + RWS_OVEC_RSIZE; /* Check for repeating a recursion without advancing the subject pointer. This should catch convoluted mutual recursions. (Some simple cases are caught at compile time.) */ for (ri = mb->recursive; ri != NULL; ri = ri->prevrec) if (recno == ri->group_num && ptr == ri->subject_position) return PCRE2_ERROR_RECURSELOOP; /* Remember this recursion and where we started it so as to catch infinite loops. */ new_recursive.group_num = recno; new_recursive.subject_position = ptr; new_recursive.prevrec = mb->recursive; mb->recursive = &new_recursive; rc = internal_dfa_match( mb, /* fixed match data */ callpat, /* this subexpression's code */ ptr, /* where we currently are */ (PCRE2_SIZE)(ptr - start_subject), /* start offset */ local_offsets, /* offset vector */ RWS_OVEC_RSIZE/OVEC_UNIT, /* size of same */ local_workspace, /* workspace vector */ RWS_RSIZE, /* size of same */ rlevel, /* function recursion level */ RWS); /* recursion workspace */ rws->free += RWS_RSIZE + RWS_OVEC_RSIZE; mb->recursive = new_recursive.prevrec; /* Done this recursion */ /* Ran out of internal offsets */ if (rc == 0) return PCRE2_ERROR_DFA_RECURSE; /* For each successful matched substring, set up the next state with a count of characters to skip before trying it. Note that the count is in characters, not bytes. */ if (rc > 0) { for (rc = rc*2 - 2; rc >= 0; rc -= 2) { PCRE2_SIZE charcount = local_offsets[rc+1] - local_offsets[rc]; #if defined SUPPORT_UNICODE && PCRE2_CODE_UNIT_WIDTH != 32 if (utf) { PCRE2_SPTR p = start_subject + local_offsets[rc]; PCRE2_SPTR pp = start_subject + local_offsets[rc+1]; while (p < pp) if (NOT_FIRSTCU(*p++)) charcount--; } #endif if (charcount > 0) { ADD_NEW_DATA(-(state_offset + LINK_SIZE + 1), 0, (int)(charcount - 1)); } else { ADD_ACTIVE(state_offset + LINK_SIZE + 1, 0); } } } else if (rc != PCRE2_ERROR_NOMATCH) return rc; } break; /*-----------------------------------------------------------------*/ case OP_BRAPOS: case OP_SBRAPOS: case OP_CBRAPOS: case OP_SCBRAPOS: case OP_BRAPOSZERO: { int rc; int *local_workspace; PCRE2_SIZE *local_offsets; PCRE2_SIZE charcount, matched_count; PCRE2_SPTR local_ptr = ptr; RWS_anchor *rws = (RWS_anchor *)RWS; BOOL allow_zero; if (rws->free < RWS_RSIZE + RWS_OVEC_OSIZE) { rc = more_workspace(&rws, RWS_OVEC_OSIZE, mb); if (rc != 0) return rc; RWS = (int *)rws; } local_offsets = (PCRE2_SIZE *)(RWS + rws->size - rws->free); local_workspace = ((int *)local_offsets) + RWS_OVEC_OSIZE; rws->free -= RWS_RSIZE + RWS_OVEC_OSIZE; if (codevalue == OP_BRAPOSZERO) { allow_zero = TRUE; codevalue = *(++code); /* Codevalue will be one of above BRAs */ } else allow_zero = FALSE; /* Loop to match the subpattern as many times as possible as if it were a complete pattern. */ for (matched_count = 0;; matched_count++) { rc = internal_dfa_match( mb, /* fixed match data */ code, /* this subexpression's code */ local_ptr, /* where we currently are */ (PCRE2_SIZE)(ptr - start_subject), /* start offset */ local_offsets, /* offset vector */ RWS_OVEC_OSIZE/OVEC_UNIT, /* size of same */ local_workspace, /* workspace vector */ RWS_RSIZE, /* size of same */ rlevel, /* function recursion level */ RWS); /* recursion workspace */ /* Failed to match */ if (rc < 0) { if (rc != PCRE2_ERROR_NOMATCH) return rc; break; } /* Matched: break the loop if zero characters matched. */ charcount = local_offsets[1] - local_offsets[0]; if (charcount == 0) break; local_ptr += charcount; /* Advance temporary position ptr */ } rws->free += RWS_RSIZE + RWS_OVEC_OSIZE; /* At this point we have matched the subpattern matched_count times, and local_ptr is pointing to the character after the end of the last match. */ if (matched_count > 0 || allow_zero) { PCRE2_SPTR end_subpattern = code; int next_state_offset; do { end_subpattern += GET(end_subpattern, 1); } while (*end_subpattern == OP_ALT); next_state_offset = (int)(end_subpattern - start_code + LINK_SIZE + 1); /* Optimization: if there are no more active states, and there are no new states yet set up, then skip over the subject string right here, to save looping. Otherwise, set up the new state to swing into action when the end of the matched substring is reached. */ if (i + 1 >= active_count && new_count == 0) { ptr = local_ptr; clen = 0; ADD_NEW(next_state_offset, 0); } else { PCRE2_SPTR p = ptr; PCRE2_SPTR pp = local_ptr; charcount = (PCRE2_SIZE)(pp - p); #if defined SUPPORT_UNICODE && PCRE2_CODE_UNIT_WIDTH != 32 if (utf) while (p < pp) if (NOT_FIRSTCU(*p++)) charcount--; #endif ADD_NEW_DATA(-next_state_offset, 0, (int)(charcount - 1)); } } } break; /*-----------------------------------------------------------------*/ case OP_ONCE: { int rc; int *local_workspace; PCRE2_SIZE *local_offsets; RWS_anchor *rws = (RWS_anchor *)RWS; if (rws->free < RWS_RSIZE + RWS_OVEC_OSIZE) { rc = more_workspace(&rws, RWS_OVEC_OSIZE, mb); if (rc != 0) return rc; RWS = (int *)rws; } local_offsets = (PCRE2_SIZE *)(RWS + rws->size - rws->free); local_workspace = ((int *)local_offsets) + RWS_OVEC_OSIZE; rws->free -= RWS_RSIZE + RWS_OVEC_OSIZE; rc = internal_dfa_match( mb, /* fixed match data */ code, /* this subexpression's code */ ptr, /* where we currently are */ (PCRE2_SIZE)(ptr - start_subject), /* start offset */ local_offsets, /* offset vector */ RWS_OVEC_OSIZE/OVEC_UNIT, /* size of same */ local_workspace, /* workspace vector */ RWS_RSIZE, /* size of same */ rlevel, /* function recursion level */ RWS); /* recursion workspace */ rws->free += RWS_RSIZE + RWS_OVEC_OSIZE; if (rc >= 0) { PCRE2_SPTR end_subpattern = code; PCRE2_SIZE charcount = local_offsets[1] - local_offsets[0]; int next_state_offset, repeat_state_offset; do { end_subpattern += GET(end_subpattern, 1); } while (*end_subpattern == OP_ALT); next_state_offset = (int)(end_subpattern - start_code + LINK_SIZE + 1); /* If the end of this subpattern is KETRMAX or KETRMIN, we must arrange for the repeat state also to be added to the relevant list. Calculate the offset, or set -1 for no repeat. */ repeat_state_offset = (*end_subpattern == OP_KETRMAX || *end_subpattern == OP_KETRMIN)? (int)(end_subpattern - start_code - GET(end_subpattern, 1)) : -1; /* If we have matched an empty string, add the next state at the current character pointer. This is important so that the duplicate checking kicks in, which is what breaks infinite loops that match an empty string. */ if (charcount == 0) { ADD_ACTIVE(next_state_offset, 0); } /* Optimization: if there are no more active states, and there are no new states yet set up, then skip over the subject string right here, to save looping. Otherwise, set up the new state to swing into action when the end of the matched substring is reached. */ else if (i + 1 >= active_count && new_count == 0) { ptr += charcount; clen = 0; ADD_NEW(next_state_offset, 0); /* If we are adding a repeat state at the new character position, we must fudge things so that it is the only current state. Otherwise, it might be a duplicate of one we processed before, and that would cause it to be skipped. */ if (repeat_state_offset >= 0) { next_active_state = active_states; active_count = 0; i = -1; ADD_ACTIVE(repeat_state_offset, 0); } } else { #if defined SUPPORT_UNICODE && PCRE2_CODE_UNIT_WIDTH != 32 if (utf) { PCRE2_SPTR p = start_subject + local_offsets[0]; PCRE2_SPTR pp = start_subject + local_offsets[1]; while (p < pp) if (NOT_FIRSTCU(*p++)) charcount--; } #endif ADD_NEW_DATA(-next_state_offset, 0, (int)(charcount - 1)); if (repeat_state_offset >= 0) { ADD_NEW_DATA(-repeat_state_offset, 0, (int)(charcount - 1)); } } } else if (rc != PCRE2_ERROR_NOMATCH) return rc; } break; /* ========================================================================== */ /* Handle callouts */ case OP_CALLOUT: case OP_CALLOUT_STR: { PCRE2_SIZE callout_length; rrc = do_callout(code, offsets, current_subject, ptr, mb, 0, &callout_length); if (rrc < 0) return rrc; /* Abandon */ if (rrc == 0) { ADD_ACTIVE(state_offset + (int)callout_length, 0); } } break; /* ========================================================================== */ default: /* Unsupported opcode */ return PCRE2_ERROR_DFA_UITEM; } NEXT_ACTIVE_STATE: continue; } /* End of loop scanning active states */ /* We have finished the processing at the current subject character. If no new states have been set for the next character, we have found all the matches that we are going to find. If we are at the top level and partial matching has been requested, check for appropriate conditions. The "forced_ fail" variable counts the number of (*F) encountered for the character. If it is equal to the original active_count (saved in workspace[1]) it means that (*F) was found on every active state. In this case we don't want to give a partial match. The "could_continue" variable is true if a state could have continued but for the fact that the end of the subject was reached. */ if (new_count <= 0) { if (rlevel == 1 && /* Top level, and */ could_continue && /* Some could go on, and */ forced_fail != workspace[1] && /* Not all forced fail & */ ( /* either... */ (mb->moptions & PCRE2_PARTIAL_HARD) != 0 /* Hard partial */ || /* or... */ ((mb->moptions & PCRE2_PARTIAL_SOFT) != 0 && /* Soft partial and */ match_count < 0) /* no matches */ ) && /* And... */ ( partial_newline || /* Either partial NL */ ( /* or ... */ ptr >= end_subject && /* End of subject and */ ptr > mb->start_used_ptr) /* Inspected non-empty string */ ) ) match_count = PCRE2_ERROR_PARTIAL; break; /* Exit from loop along the subject string */ } /* One or more states are active for the next character. */ ptr += clen; /* Advance to next subject character */ } /* Loop to move along the subject string */ /* Control gets here from "break" a few lines above. If we have a match and PCRE2_ENDANCHORED is set, the match fails. */ if (match_count >= 0 && ((mb->moptions | mb->poptions) & PCRE2_ENDANCHORED) != 0 && ptr < end_subject) match_count = PCRE2_ERROR_NOMATCH; return match_count; } /************************************************* * Match a pattern using the DFA algorithm * *************************************************/ /* This function matches a compiled pattern to a subject string, using the alternate matching algorithm that finds all matches at once. Arguments: code points to the compiled pattern subject subject string length length of subject string startoffset where to start matching in the subject options option bits match_data points to a match data structure gcontext points to a match context workspace pointer to workspace wscount size of workspace Returns: > 0 => number of match offset pairs placed in offsets = 0 => offsets overflowed; longest matches are present -1 => failed to match < -1 => some kind of unexpected problem */ PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION pcre2_dfa_match(const pcre2_code *code, PCRE2_SPTR subject, PCRE2_SIZE length, PCRE2_SIZE start_offset, uint32_t options, pcre2_match_data *match_data, pcre2_match_context *mcontext, int *workspace, PCRE2_SIZE wscount) { int rc; const pcre2_real_code *re = (const pcre2_real_code *)code; PCRE2_SPTR start_match; PCRE2_SPTR end_subject; PCRE2_SPTR bumpalong_limit; PCRE2_SPTR req_cu_ptr; BOOL utf, anchored, startline, firstline; BOOL has_first_cu = FALSE; BOOL has_req_cu = FALSE; PCRE2_UCHAR first_cu = 0; PCRE2_UCHAR first_cu2 = 0; PCRE2_UCHAR req_cu = 0; PCRE2_UCHAR req_cu2 = 0; const uint8_t *start_bits = NULL; /* We need to have mb pointing to a match block, because the IS_NEWLINE macro is used below, and it expects NLBLOCK to be defined as a pointer. */ pcre2_callout_block cb; dfa_match_block actual_match_block; dfa_match_block *mb = &actual_match_block; /* Set up a starting block of memory for use during recursive calls to internal_dfa_match(). By putting this on the stack, it minimizes resource use in the case when it is not needed. If this is too small, more memory is obtained from the heap. At the start of each block is an anchor structure.*/ int base_recursion_workspace[RWS_BASE_SIZE]; RWS_anchor *rws = (RWS_anchor *)base_recursion_workspace; rws->next = NULL; rws->size = RWS_BASE_SIZE; rws->free = RWS_BASE_SIZE - RWS_ANCHOR_SIZE; /* A length equal to PCRE2_ZERO_TERMINATED implies a zero-terminated subject string. */ if (length == PCRE2_ZERO_TERMINATED) length = PRIV(strlen)(subject); /* Plausibility checks */ if ((options & ~PUBLIC_DFA_MATCH_OPTIONS) != 0) return PCRE2_ERROR_BADOPTION; if (re == NULL || subject == NULL || workspace == NULL || match_data == NULL) return PCRE2_ERROR_NULL; if (wscount < 20) return PCRE2_ERROR_DFA_WSSIZE; if (start_offset > length) return PCRE2_ERROR_BADOFFSET; /* Partial matching and PCRE2_ENDANCHORED are currently not allowed at the same time. */ if ((options & (PCRE2_PARTIAL_HARD|PCRE2_PARTIAL_SOFT)) != 0 && ((re->overall_options | options) & PCRE2_ENDANCHORED) != 0) return PCRE2_ERROR_BADOPTION; /* Check that the first field in the block is the magic number. If it is not, return with PCRE2_ERROR_BADMAGIC. */ if (re->magic_number != MAGIC_NUMBER) return PCRE2_ERROR_BADMAGIC; /* Check the code unit width. */ if ((re->flags & PCRE2_MODE_MASK) != PCRE2_CODE_UNIT_WIDTH/8) return PCRE2_ERROR_BADMODE; /* PCRE2_NOTEMPTY and PCRE2_NOTEMPTY_ATSTART are match-time flags in the options variable for this function. Users of PCRE2 who are not calling the function directly would like to have a way of setting these flags, in the same way that they can set pcre2_compile() flags like PCRE2_NO_AUTOPOSSESS with constructions like (*NO_AUTOPOSSESS). To enable this, (*NOTEMPTY) and (*NOTEMPTY_ATSTART) set bits in the pattern's "flag" function which can now be transferred to the options for this function. The bits are guaranteed to be adjacent, but do not have the same values. This bit of Boolean trickery assumes that the match-time bits are not more significant than the flag bits. If by accident this is not the case, a compile-time division by zero error will occur. */ #define FF (PCRE2_NOTEMPTY_SET|PCRE2_NE_ATST_SET) #define OO (PCRE2_NOTEMPTY|PCRE2_NOTEMPTY_ATSTART) options |= (re->flags & FF) / ((FF & (~FF+1)) / (OO & (~OO+1))); #undef FF #undef OO /* If restarting after a partial match, do some sanity checks on the contents of the workspace. */ if ((options & PCRE2_DFA_RESTART) != 0) { if ((workspace[0] & (-2)) != 0 || workspace[1] < 1 || workspace[1] > (int)((wscount - 2)/INTS_PER_STATEBLOCK)) return PCRE2_ERROR_DFA_BADRESTART; } /* Set some local values */ utf = (re->overall_options & PCRE2_UTF) != 0; start_match = subject + start_offset; end_subject = subject + length; req_cu_ptr = start_match - 1; anchored = (options & (PCRE2_ANCHORED|PCRE2_DFA_RESTART)) != 0 || (re->overall_options & PCRE2_ANCHORED) != 0; /* The "must be at the start of a line" flags are used in a loop when finding where to start. */ startline = (re->flags & PCRE2_STARTLINE) != 0; firstline = (re->overall_options & PCRE2_FIRSTLINE) != 0; bumpalong_limit = end_subject; /* Initialize and set up the fixed fields in the callout block, with a pointer in the match block. */ mb->cb = &cb; cb.version = 2; cb.subject = subject; cb.subject_length = (PCRE2_SIZE)(end_subject - subject); cb.callout_flags = 0; cb.capture_top = 1; /* No capture support */ cb.capture_last = 0; cb.mark = NULL; /* No (*MARK) support */ /* Get data from the match context, if present, and fill in the remaining fields in the match block. It is an error to set an offset limit without setting the flag at compile time. */ if (mcontext == NULL) { mb->callout = NULL; mb->memctl = re->memctl; mb->match_limit = PRIV(default_match_context).match_limit; mb->match_limit_depth = PRIV(default_match_context).depth_limit; mb->heap_limit = PRIV(default_match_context).heap_limit; } else { if (mcontext->offset_limit != PCRE2_UNSET) { if ((re->overall_options & PCRE2_USE_OFFSET_LIMIT) == 0) return PCRE2_ERROR_BADOFFSETLIMIT; bumpalong_limit = subject + mcontext->offset_limit; } mb->callout = mcontext->callout; mb->callout_data = mcontext->callout_data; mb->memctl = mcontext->memctl; mb->match_limit = mcontext->match_limit; mb->match_limit_depth = mcontext->depth_limit; mb->heap_limit = mcontext->heap_limit; } if (mb->match_limit > re->limit_match) mb->match_limit = re->limit_match; if (mb->match_limit_depth > re->limit_depth) mb->match_limit_depth = re->limit_depth; if (mb->heap_limit > re->limit_heap) mb->heap_limit = re->limit_heap; mb->start_code = (PCRE2_UCHAR *)((uint8_t *)re + sizeof(pcre2_real_code)) + re->name_count * re->name_entry_size; mb->tables = re->tables; mb->start_subject = subject; mb->end_subject = end_subject; mb->start_offset = start_offset; mb->moptions = options; mb->poptions = re->overall_options; mb->match_call_count = 0; mb->heap_used = 0; /* Process the \R and newline settings. */ mb->bsr_convention = re->bsr_convention; mb->nltype = NLTYPE_FIXED; switch(re->newline_convention) { case PCRE2_NEWLINE_CR: mb->nllen = 1; mb->nl[0] = CHAR_CR; break; case PCRE2_NEWLINE_LF: mb->nllen = 1; mb->nl[0] = CHAR_NL; break; case PCRE2_NEWLINE_NUL: mb->nllen = 1; mb->nl[0] = CHAR_NUL; break; case PCRE2_NEWLINE_CRLF: mb->nllen = 2; mb->nl[0] = CHAR_CR; mb->nl[1] = CHAR_NL; break; case PCRE2_NEWLINE_ANY: mb->nltype = NLTYPE_ANY; break; case PCRE2_NEWLINE_ANYCRLF: mb->nltype = NLTYPE_ANYCRLF; break; default: return PCRE2_ERROR_INTERNAL; } /* Check a UTF string for validity if required. For 8-bit and 16-bit strings, we must also check that a starting offset does not point into the middle of a multiunit character. We check only the portion of the subject that is going to be inspected during matching - from the offset minus the maximum back reference to the given length. This saves time when a small part of a large subject is being matched by the use of a starting offset. Note that the maximum lookbehind is a number of characters, not code units. */ #ifdef SUPPORT_UNICODE if (utf && (options & PCRE2_NO_UTF_CHECK) == 0) { PCRE2_SPTR check_subject = start_match; /* start_match includes offset */ if (start_offset > 0) { #if PCRE2_CODE_UNIT_WIDTH != 32 unsigned int i; if (start_match < end_subject && NOT_FIRSTCU(*start_match)) return PCRE2_ERROR_BADUTFOFFSET; for (i = re->max_lookbehind; i > 0 && check_subject > subject; i--) { check_subject--; while (check_subject > subject && #if PCRE2_CODE_UNIT_WIDTH == 8 (*check_subject & 0xc0) == 0x80) #else /* 16-bit */ (*check_subject & 0xfc00) == 0xdc00) #endif /* PCRE2_CODE_UNIT_WIDTH == 8 */ check_subject--; } #else /* In the 32-bit library, one code unit equals one character. */ check_subject -= re->max_lookbehind; if (check_subject < subject) check_subject = subject; #endif /* PCRE2_CODE_UNIT_WIDTH != 32 */ } /* Validate the relevant portion of the subject. After an error, adjust the offset to be an absolute offset in the whole string. */ match_data->rc = PRIV(valid_utf)(check_subject, length - (PCRE2_SIZE)(check_subject - subject), &(match_data->startchar)); if (match_data->rc != 0) { match_data->startchar += (PCRE2_SIZE)(check_subject - subject); return match_data->rc; } } #endif /* SUPPORT_UNICODE */ /* Set up the first code unit to match, if available. If there's no first code unit there may be a bitmap of possible first characters. */ if ((re->flags & PCRE2_FIRSTSET) != 0) { has_first_cu = TRUE; first_cu = first_cu2 = (PCRE2_UCHAR)(re->first_codeunit); if ((re->flags & PCRE2_FIRSTCASELESS) != 0) { first_cu2 = TABLE_GET(first_cu, mb->tables + fcc_offset, first_cu); #if defined SUPPORT_UNICODE && PCRE2_CODE_UNIT_WIDTH != 8 if (utf && first_cu > 127) first_cu2 = (PCRE2_UCHAR)UCD_OTHERCASE(first_cu); #endif } } else if (!startline && (re->flags & PCRE2_FIRSTMAPSET) != 0) start_bits = re->start_bitmap; /* There may be a "last known required code unit" set. */ if ((re->flags & PCRE2_LASTSET) != 0) { has_req_cu = TRUE; req_cu = req_cu2 = (PCRE2_UCHAR)(re->last_codeunit); if ((re->flags & PCRE2_LASTCASELESS) != 0) { req_cu2 = TABLE_GET(req_cu, mb->tables + fcc_offset, req_cu); #if defined SUPPORT_UNICODE && PCRE2_CODE_UNIT_WIDTH != 8 if (utf && req_cu > 127) req_cu2 = (PCRE2_UCHAR)UCD_OTHERCASE(req_cu); #endif } } /* Fill in fields that are always returned in the match data. */ match_data->code = re; match_data->subject = subject; match_data->mark = NULL; match_data->matchedby = PCRE2_MATCHEDBY_DFA_INTERPRETER; /* Call the main matching function, looping for a non-anchored regex after a failed match. If not restarting, perform certain optimizations at the start of a match. */ for (;;) { /* ----------------- Start of match optimizations ---------------- */ /* There are some optimizations that avoid running the match if a known starting point is not found, or if a known later code unit is not present. However, there is an option (settable at compile time) that disables these, for testing and for ensuring that all callouts do actually occur. The optimizations must also be avoided when restarting a DFA match. */ if ((re->overall_options & PCRE2_NO_START_OPTIMIZE) == 0 && (options & PCRE2_DFA_RESTART) == 0) { /* If firstline is TRUE, the start of the match is constrained to the first line of a multiline string. That is, the match must be before or at the first newline following the start of matching. Temporarily adjust end_subject so that we stop the optimization scans for a first code unit immediately after the first character of a newline (the first code unit can legitimately be a newline). If the match fails at the newline, later code breaks this loop. */ if (firstline) { PCRE2_SPTR t = start_match; #ifdef SUPPORT_UNICODE if (utf) { while (t < end_subject && !IS_NEWLINE(t)) { t++; ACROSSCHAR(t < end_subject, t, t++); } } else #endif while (t < end_subject && !IS_NEWLINE(t)) t++; end_subject = t; } /* Anchored: check the first code unit if one is recorded. This may seem pointless but it can help in detecting a no match case without scanning for the required code unit. */ if (anchored) { if (has_first_cu || start_bits != NULL) { BOOL ok = start_match < end_subject; if (ok) { PCRE2_UCHAR c = UCHAR21TEST(start_match); ok = has_first_cu && (c == first_cu || c == first_cu2); if (!ok && start_bits != NULL) { #if PCRE2_CODE_UNIT_WIDTH != 8 if (c > 255) c = 255; #endif ok = (start_bits[c/8] & (1 << (c&7))) != 0; } } if (!ok) break; } } /* Not anchored. Advance to a unique first code unit if there is one. In 8-bit mode, the use of memchr() gives a big speed up, even though we have to call it twice in caseless mode, in order to find the earliest occurrence of the character in either of its cases. */ else { if (has_first_cu) { if (first_cu != first_cu2) /* Caseless */ { #if PCRE2_CODE_UNIT_WIDTH != 8 PCRE2_UCHAR smc; while (start_match < end_subject && (smc = UCHAR21TEST(start_match)) != first_cu && smc != first_cu2) start_match++; #else /* 8-bit code units */ PCRE2_SPTR pp1 = memchr(start_match, first_cu, end_subject-start_match); PCRE2_SPTR pp2 = memchr(start_match, first_cu2, end_subject-start_match); if (pp1 == NULL) start_match = (pp2 == NULL)? end_subject : pp2; else start_match = (pp2 == NULL || pp1 < pp2)? pp1 : pp2; #endif } /* The caseful case */ else { #if PCRE2_CODE_UNIT_WIDTH != 8 while (start_match < end_subject && UCHAR21TEST(start_match) != first_cu) start_match++; #else start_match = memchr(start_match, first_cu, end_subject - start_match); if (start_match == NULL) start_match = end_subject; #endif } /* If we can't find the required code unit, having reached the true end of the subject, break the bumpalong loop, to force a match failure, except when doing partial matching, when we let the next cycle run at the end of the subject. To see why, consider the pattern /(?<=abc)def/, which partially matches "abc", even though the string does not contain the starting character "d". If we have not reached the true end of the subject (PCRE2_FIRSTLINE caused end_subject to be temporarily modified) we also let the cycle run, because the matching string is legitimately allowed to start with the first code unit of a newline. */ if ((mb->moptions & (PCRE2_PARTIAL_HARD|PCRE2_PARTIAL_SOFT)) == 0 && start_match >= mb->end_subject) break; } /* If there's no first code unit, advance to just after a linebreak for a multiline match if required. */ else if (startline) { if (start_match > mb->start_subject + start_offset) { #ifdef SUPPORT_UNICODE if (utf) { while (start_match < end_subject && !WAS_NEWLINE(start_match)) { start_match++; ACROSSCHAR(start_match < end_subject, start_match, start_match++); } } else #endif while (start_match < end_subject && !WAS_NEWLINE(start_match)) start_match++; /* If we have just passed a CR and the newline option is ANY or ANYCRLF, and we are now at a LF, advance the match position by one more code unit. */ if (start_match[-1] == CHAR_CR && (mb->nltype == NLTYPE_ANY || mb->nltype == NLTYPE_ANYCRLF) && start_match < end_subject && UCHAR21TEST(start_match) == CHAR_NL) start_match++; } } /* If there's no first code unit or a requirement for a multiline line start, advance to a non-unique first code unit if any have been identified. The bitmap contains only 256 bits. When code units are 16 or 32 bits wide, all code units greater than 254 set the 255 bit. */ else if (start_bits != NULL) { while (start_match < end_subject) { uint32_t c = UCHAR21TEST(start_match); #if PCRE2_CODE_UNIT_WIDTH != 8 if (c > 255) c = 255; #endif if ((start_bits[c/8] & (1 << (c&7))) != 0) break; start_match++; } /* See comment above in first_cu checking about the next line. */ if ((mb->moptions & (PCRE2_PARTIAL_HARD|PCRE2_PARTIAL_SOFT)) == 0 && start_match >= mb->end_subject) break; } } /* End of first code unit handling */ /* Restore fudged end_subject */ end_subject = mb->end_subject; /* The following two optimizations are disabled for partial matching. */ if ((mb->moptions & (PCRE2_PARTIAL_HARD|PCRE2_PARTIAL_SOFT)) == 0) { /* The minimum matching length is a lower bound; no actual string of that length may actually match the pattern. Although the value is, strictly, in characters, we treat it as code units to avoid spending too much time in this optimization. */ if (end_subject - start_match < re->minlength) goto NOMATCH_EXIT; /* If req_cu is set, we know that that code unit must appear in the subject for the match to succeed. If the first code unit is set, req_cu must be later in the subject; otherwise the test starts at the match point. This optimization can save a huge amount of backtracking in patterns with nested unlimited repeats that aren't going to match. Writing separate code for cased/caseless versions makes it go faster, as does using an autoincrement and backing off on a match. HOWEVER: when the subject string is very, very long, searching to its end can take a long time, and give bad performance on quite ordinary patterns. This showed up when somebody was matching something like /^\d+C/ on a 32-megabyte string... so we don't do this when the string is sufficiently long. */ if (has_req_cu && end_subject - start_match < REQ_CU_MAX) { PCRE2_SPTR p = start_match + (has_first_cu? 1:0); /* We don't need to repeat the search if we haven't yet reached the place we found it at last time. */ if (p > req_cu_ptr) { if (req_cu != req_cu2) { while (p < end_subject) { uint32_t pp = UCHAR21INCTEST(p); if (pp == req_cu || pp == req_cu2) { p--; break; } } } else { while (p < end_subject) { if (UCHAR21INCTEST(p) == req_cu) { p--; break; } } } /* If we can't find the required code unit, break the matching loop, forcing a match failure. */ if (p >= end_subject) break; /* If we have found the required code unit, save the point where we found it, so that we don't search again next time round the loop if the start hasn't passed this code unit yet. */ req_cu_ptr = p; } } } } /* ------------ End of start of match optimizations ------------ */ /* Give no match if we have passed the bumpalong limit. */ if (start_match > bumpalong_limit) break; /* OK, now we can do the business */ mb->start_used_ptr = start_match; mb->last_used_ptr = start_match; mb->recursive = NULL; rc = internal_dfa_match( mb, /* fixed match data */ mb->start_code, /* this subexpression's code */ start_match, /* where we currently are */ start_offset, /* start offset in subject */ match_data->ovector, /* offset vector */ (uint32_t)match_data->oveccount * 2, /* actual size of same */ workspace, /* workspace vector */ (int)wscount, /* size of same */ 0, /* function recurse level */ base_recursion_workspace); /* initial workspace for recursion */ /* Anything other than "no match" means we are done, always; otherwise, carry on only if not anchored. */ if (rc != PCRE2_ERROR_NOMATCH || anchored) { if (rc == PCRE2_ERROR_PARTIAL && match_data->oveccount > 0) { match_data->ovector[0] = (PCRE2_SIZE)(start_match - subject); match_data->ovector[1] = (PCRE2_SIZE)(end_subject - subject); } match_data->leftchar = (PCRE2_SIZE)(mb->start_used_ptr - subject); match_data->rightchar = (PCRE2_SIZE)( mb->last_used_ptr - subject); match_data->startchar = (PCRE2_SIZE)(start_match - subject); match_data->rc = rc; goto EXIT; } /* Advance to the next subject character unless we are at the end of a line and firstline is set. */ if (firstline && IS_NEWLINE(start_match)) break; start_match++; #ifdef SUPPORT_UNICODE if (utf) { ACROSSCHAR(start_match < end_subject, start_match, start_match++); } #endif if (start_match > end_subject) break; /* If we have just passed a CR and we are now at a LF, and the pattern does not contain any explicit matches for \r or \n, and the newline option is CRLF or ANY or ANYCRLF, advance the match position by one more character. */ if (UCHAR21TEST(start_match - 1) == CHAR_CR && start_match < end_subject && UCHAR21TEST(start_match) == CHAR_NL && (re->flags & PCRE2_HASCRORLF) == 0 && (mb->nltype == NLTYPE_ANY || mb->nltype == NLTYPE_ANYCRLF || mb->nllen == 2)) start_match++; } /* "Bumpalong" loop */ NOMATCH_EXIT: rc = PCRE2_ERROR_NOMATCH; EXIT: while (rws->next != NULL) { RWS_anchor *next = rws->next; rws->next = next->next; mb->memctl.free(next, mb->memctl.memory_data); } return rc; } /* End of pcre2_dfa_match.c */