3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2005, 2006, 2007, by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
10 #include "regcharclass.h"
12 /* Convert branch sequences to more efficient trie ops? */
13 #define PERL_ENABLE_TRIE_OPTIMISATION 1
15 /* Be really aggressive about optimising patterns with trie sequences? */
16 #define PERL_ENABLE_EXTENDED_TRIE_OPTIMISATION 1
18 /* Should the optimiser take positive assertions into account? */
19 #define PERL_ENABLE_POSITIVE_ASSERTION_STUDY 0
21 /* Not for production use: */
22 #define PERL_ENABLE_EXPERIMENTAL_REGEX_OPTIMISATIONS 0
24 /* Activate offsets code - set to if 1 to enable */
26 #define RE_TRACK_PATTERN_OFFSETS
30 * The "internal use only" fields in regexp.h are present to pass info from
31 * compile to execute that permits the execute phase to run lots faster on
32 * simple cases. They are:
34 * regstart sv that must begin a match; NULL if none obvious
35 * reganch is the match anchored (at beginning-of-line only)?
36 * regmust string (pointer into program) that match must include, or NULL
37 * [regmust changed to SV* for bminstr()--law]
38 * regmlen length of regmust string
39 * [regmlen not used currently]
41 * Regstart and reganch permit very fast decisions on suitable starting points
42 * for a match, cutting down the work a lot. Regmust permits fast rejection
43 * of lines that cannot possibly match. The regmust tests are costly enough
44 * that pregcomp() supplies a regmust only if the r.e. contains something
45 * potentially expensive (at present, the only such thing detected is * or +
46 * at the start of the r.e., which can involve a lot of backup). Regmlen is
47 * supplied because the test in pregexec() needs it and pregcomp() is computing
49 * [regmust is now supplied always. The tests that use regmust have a
50 * heuristic that disables the test if it usually matches.]
52 * [In fact, we now use regmust in many cases to locate where the search
53 * starts in the string, so if regback is >= 0, the regmust search is never
54 * wasted effort. The regback variable says how many characters back from
55 * where regmust matched is the earliest possible start of the match.
56 * For instance, /[a-z].foo/ has a regmust of 'foo' and a regback of 2.]
60 * Structure for regexp "program". This is essentially a linear encoding
61 * of a nondeterministic finite-state machine (aka syntax charts or
62 * "railroad normal form" in parsing technology). Each node is an opcode
63 * plus a "next" pointer, possibly plus an operand. "Next" pointers of
64 * all nodes except BRANCH implement concatenation; a "next" pointer with
65 * a BRANCH on both ends of it is connecting two alternatives. (Here we
66 * have one of the subtle syntax dependencies: an individual BRANCH (as
67 * opposed to a collection of them) is never concatenated with anything
68 * because of operator precedence.) The operand of some types of node is
69 * a literal string; for others, it is a node leading into a sub-FSM. In
70 * particular, the operand of a BRANCH node is the first node of the branch.
71 * (NB this is *not* a tree structure: the tail of the branch connects
72 * to the thing following the set of BRANCHes.) The opcodes are defined
73 * in regnodes.h which is generated from regcomp.sym by regcomp.pl.
77 * A node is one char of opcode followed by two chars of "next" pointer.
78 * "Next" pointers are stored as two 8-bit pieces, high order first. The
79 * value is a positive offset from the opcode of the node containing it.
80 * An operand, if any, simply follows the node. (Note that much of the
81 * code generation knows about this implicit relationship.)
83 * Using two bytes for the "next" pointer is vast overkill for most things,
84 * but allows patterns to get big without disasters.
86 * [The "next" pointer is always aligned on an even
87 * boundary, and reads the offset directly as a short.]
90 /* This is the stuff that used to live in regexp.h that was truly
91 private to the engine itself. It now lives here. */
95 typedef struct regexp_internal {
96 int name_list_idx; /* Optional data index of an array of paren names */
98 U32 *offsets; /* offset annotations 20001228 MJD
99 data about mapping the program to the
101 offsets[0] is proglen when this is used
106 regnode *regstclass; /* Optional startclass as identified or constructed
108 struct reg_data *data; /* Additional miscellaneous data used by the program.
109 Used to make it easier to clone and free arbitrary
110 data that the regops need. Often the ARG field of
111 a regop is an index into this structure */
112 struct reg_code_block *code_blocks;/* positions of literal (?{}) */
113 int num_code_blocks; /* size of code_blocks[] */
114 regnode program[1]; /* Unwarranted chumminess with compiler. */
117 #define RXi_SET(x,y) (x)->pprivate = (void*)(y)
118 #define RXi_GET(x) ((regexp_internal *)((x)->pprivate))
119 #define RXi_GET_DECL(r,ri) regexp_internal *ri = RXi_GET(r)
121 * Flags stored in regexp->intflags
122 * These are used only internally to the regexp engine
124 * See regexp.h for flags used externally to the regexp engine
126 #define RXp_INTFLAGS(rx) ((rx)->intflags)
127 #define RX_INTFLAGS(prog) RXp_INTFLAGS(ReANY(prog))
129 #define PREGf_SKIP 0x00000001
130 #define PREGf_IMPLICIT 0x00000002 /* Converted .* to ^.* */
131 #define PREGf_NAUGHTY 0x00000004 /* how exponential is this pattern? */
132 #define PREGf_VERBARG_SEEN 0x00000008
133 #define PREGf_CUTGROUP_SEEN 0x00000010
134 #define PREGf_USE_RE_EVAL 0x00000020 /* compiled with "use re 'eval'" */
135 /* these used to be extflags, but are now intflags */
136 #define PREGf_NOSCAN 0x00000040
138 #define PREGf_GPOS_SEEN 0x00000100
139 #define PREGf_GPOS_FLOAT 0x00000200
141 #define PREGf_ANCH_MBOL 0x00000400
142 #define PREGf_ANCH_SBOL 0x00000800
143 #define PREGf_ANCH_GPOS 0x00001000
146 ( PREGf_ANCH_SBOL | PREGf_ANCH_GPOS | PREGf_ANCH_MBOL )
148 /* this is where the old regcomp.h started */
150 struct regnode_string {
157 /* Argument bearing node - workhorse,
158 arg1 is often for the data field */
166 /* Similar to a regnode_1 but with an extra signed argument */
175 /* 'Two field' -- Two 16 bit unsigned args */
184 /* This give the number of code points that can be in the bitmap of an ANYOF
185 * node. The shift number must currently be one of: 8..12. It can't be less
186 * than 8 (256) because some code relies on it being at least that. Above 12
187 * (4096), and you start running into warnings that some data structure widths
188 * have been exceeded, though the test suite as of this writing still passes
189 * for up through 16, which is as high as anyone would ever want to go,
190 * encompassing all of the Unicode BMP, and thus including all the economically
191 * important world scripts. At 12 most of them are: including Arabic,
192 * Cyrillic, Greek, Hebrew, Indian subcontinent, Latin, and Thai; but not Han,
193 * Japanese, nor Korean. (The regarglen structure in regnodes.h is a U8, and
194 * the trie types TRIEC and AHOCORASICKC are larger than U8 for shift values
195 * below above 12.) Be sure to benchmark before changing, as larger sizes do
196 * significantly slow down the test suite */
197 #define NUM_ANYOF_CODE_POINTS (1 << 8)
199 #define ANYOF_BITMAP_SIZE (NUM_ANYOF_CODE_POINTS / 8) /* 8 bits/Byte */
201 /* Note that these form structs which are supersets of the next smaller one, by
202 * appending fields. Alignment problems can occur if one of those optional
203 * fields requires stricter alignment than the base struct. And formal
204 * parameters that can really be two or more of the structs should be
205 * declared as the smallest one it could be. See commit message for
206 * 7dcac5f6a5195002b55c935ee1d67f67e1df280b. Regnode allocation is done
207 * without regard to alignment, and changing it to would also require changing
208 * the code that inserts and deletes regnodes. The basic single-argument
209 * regnode has a U32, which is what reganode() allocates as a unit. Therefore
210 * no field can require stricter alignment than U32. */
212 /* also used by trie */
213 struct regnode_charclass {
217 U32 arg1; /* set by set_ANYOF_arg() */
218 char bitmap[ANYOF_BITMAP_SIZE]; /* only compile-time */
221 /* has runtime (locale) \d, \w, ..., [:posix:] classes */
222 struct regnode_charclass_class {
223 U8 flags; /* ANYOF_MATCHES_POSIXL bit must go here */
227 char bitmap[ANYOF_BITMAP_SIZE]; /* both compile-time ... */
228 U32 classflags; /* and run-time */
231 /* A synthetic start class (SSC); is a regnode_charclass_posixl_fold, plus an
232 * extra SV*, used only during its construction and which is not used by
233 * regexec.c. Note that the 'next_off' field is unused, as the SSC stands
234 * alone, so there is never a next node. Also, there is no alignment issue,
235 * because these are declared or allocated as a complete unit so the compiler
236 * takes care of alignment. This is unlike the other regnodes which are
237 * allocated in terms of multiples of a single-argument regnode. SSC nodes can
238 * have a pointer field because there is no alignment issue, and because it is
239 * set to NULL after construction, before any cloning of the pattern */
241 U8 flags; /* ANYOF_MATCHES_POSIXL bit must go here */
245 char bitmap[ANYOF_BITMAP_SIZE]; /* both compile-time ... */
246 U32 classflags; /* ... and run-time */
248 /* Auxiliary, only used during construction; NULL afterwards: list of code
253 /* We take advantage of 'next_off' not otherwise being used in the SSC by
254 * actually using it: by setting it to 1. This allows us to test and
255 * distinguish between an SSC and other ANYOF node types, as 'next_off' cannot
256 * otherwise be 1, because it is the offset to the next regnode expressed in
257 * units of regnodes. Since an ANYOF node contains extra fields, it adds up
258 * to 12 regnode units on 32-bit systems, (hence the minimum this can be (if
259 * not 0) is 11 there. Even if things get tightly packed on a 64-bit system,
260 * it still would be more than 1. */
261 #define set_ANYOF_SYNTHETIC(n) STMT_START{ OP(n) = ANYOF; \
264 #define is_ANYOF_SYNTHETIC(n) (PL_regkind[OP(n)] == ANYOF && NEXT_OFF(n) == 1)
266 /* XXX fix this description.
267 Impose a limit of REG_INFTY on various pattern matching operations
268 to limit stack growth and to avoid "infinite" recursions.
270 /* The default size for REG_INFTY is I16_MAX, which is the same as
271 SHORT_MAX (see perl.h). Unfortunately I16 isn't necessarily 16 bits
272 (see handy.h). On the Cray C90, sizeof(short)==4 and hence I16_MAX is
273 ((1<<31)-1), while on the Cray T90, sizeof(short)==8 and I16_MAX is
274 ((1<<63)-1). To limit stack growth to reasonable sizes, supply a
276 --Andy Dougherty 11 June 1998
280 # define REG_INFTY ((1<<15)-1)
285 # define REG_INFTY I16_MAX
288 #define ARG_VALUE(arg) (arg)
289 #define ARG__SET(arg,val) ((arg) = (val))
295 #define ARG(p) ARG_VALUE(ARG_LOC(p))
296 #define ARG1(p) ARG_VALUE(ARG1_LOC(p))
297 #define ARG2(p) ARG_VALUE(ARG2_LOC(p))
298 #define ARG2L(p) ARG_VALUE(ARG2L_LOC(p))
300 #define ARG_SET(p, val) ARG__SET(ARG_LOC(p), (val))
301 #define ARG1_SET(p, val) ARG__SET(ARG1_LOC(p), (val))
302 #define ARG2_SET(p, val) ARG__SET(ARG2_LOC(p), (val))
303 #define ARG2L_SET(p, val) ARG__SET(ARG2L_LOC(p), (val))
308 #define NEXT_OFF(p) ((p)->next_off)
309 #define NODE_ALIGN(node)
310 /* the following define was set to 0xde in 075abff3
311 * as part of some linting logic. I have set it to 0
312 * as otherwise in every place where we /might/ set flags
313 * we have to set it 0 explicitly, which duplicates
314 * assignments and IMO adds an unacceptable level of
315 * surprise to working in the regex engine. If this
316 * is changed from 0 then at the very least make sure
317 * that SBOL for /^/ sets the flags to 0 explicitly.
319 #define NODE_ALIGN_FILL(node) ((node)->flags = 0)
321 #define SIZE_ALIGN NODE_ALIGN
328 #define OP(p) ((p)->type)
329 #define FLAGS(p) ((p)->flags) /* Caution: Doesn't apply to all \
330 regnode types. For some, it's the \
331 character set of the regnode */
332 #define OPERAND(p) (((struct regnode_string *)p)->string)
333 #define MASK(p) ((char*)OPERAND(p))
334 #define STR_LEN(p) (((struct regnode_string *)p)->str_len)
335 #define STRING(p) (((struct regnode_string *)p)->string)
336 #define STR_SZ(l) ((l + sizeof(regnode) - 1) / sizeof(regnode))
337 #define NODE_SZ_STR(p) (STR_SZ(STR_LEN(p))+1)
344 #define NODE_ALIGN(node)
345 #define ARG_LOC(p) (((struct regnode_1 *)p)->arg1)
346 #define ARG1_LOC(p) (((struct regnode_2 *)p)->arg1)
347 #define ARG2_LOC(p) (((struct regnode_2 *)p)->arg2)
348 #define ARG2L_LOC(p) (((struct regnode_2L *)p)->arg2)
350 #define NODE_STEP_REGNODE 1 /* sizeof(regnode)/sizeof(regnode) */
351 #define EXTRA_STEP_2ARGS EXTRA_SIZE(struct regnode_2)
353 #define NODE_STEP_B 4
355 #define NEXTOPER(p) ((p) + NODE_STEP_REGNODE)
356 #define PREVOPER(p) ((p) - NODE_STEP_REGNODE)
358 #define FILL_ADVANCE_NODE(ptr, op) STMT_START { \
359 (ptr)->type = op; (ptr)->next_off = 0; (ptr)++; } STMT_END
360 #define FILL_ADVANCE_NODE_ARG(ptr, op, arg) STMT_START { \
361 ARG_SET(ptr, arg); FILL_ADVANCE_NODE(ptr, op); (ptr) += 1; } STMT_END
362 #define FILL_ADVANCE_NODE_2L_ARG(ptr, op, arg1, arg2) \
364 ARG_SET(ptr, arg1); \
365 ARG2L_SET(ptr, arg2); \
366 FILL_ADVANCE_NODE(ptr, op); \
370 #define REG_MAGIC 0234
372 #define SIZE_ONLY (RExC_emit == (regnode *) & RExC_emit_dummy)
373 #define PASS1 SIZE_ONLY
374 #define PASS2 (! SIZE_ONLY)
376 /* If the bitmap fully represents what this ANYOF node can match, the
377 * ARG is set to this special value (since 0, 1, ... are legal, but will never
378 * reach this high). */
379 #define ANYOF_ONLY_HAS_BITMAP ((U32) -1)
381 /* Below are the flags for node->flags of ANYOF. These are in short supply,
382 * with none currently available. The ABOVE_BITMAP_ALL bit could be freed up
383 * by resorting to creating a swash containing everything above 255. This
384 * seems likely to introduce a performance penalty (but actual numbers haven't
385 * been done), so its probably better do some of the other possibilities below
386 * in preference to this.
388 * If just one bit is required, it seems to me (khw) that the best option would
389 * be to turn the ANYOF_LOC_REQ_UTF8 bit into a separate node type: a
390 * specialization of the ANYOFL type, freeing up the currently occupied bit.
391 * When turning a bit into a node type, one has to take into consideration that
392 * a SSC may use that bit -- not just a regular ANYOF[DL]?. In the case of
393 * ANYOF_LOC_REQ_UTF8, the only likely problem is accurately settting the SSC
394 * node-type to the new one, which would likely involve S_ssc_or and S_ssc_and,
395 * and not how the SSC currently gets set to ANYOFL. This bit is a natural
396 * candidate for being a separate node type because it is a specialization of
397 * the current ANYOFL, and because no other ANYOFL-only bits are set when it
398 * is; also most of its uses are actually outside the reginclass() function, so
399 * this could be done with no performance penalty. The other potential bits
400 * seem to me to have a potential issue with a combinatorial explosion of node
401 * types, because of not having that mutual exclusivity, where you may end up
402 * having to have a node type for bitX being set, one for bitY, and one for
405 * If you don't want to do this, or two bits are required, one could instead
406 * rename the ANYOF_POSIXL bit to be ANYOFL_LARGE, to mean that the ANYOF node
407 * has an extra 32 bits beyond what a regular one does. That's what it
408 * effectively means now, with the extra space all for the POSIX class bits.
409 * But those classes actually only occupy 30 bits, so the ANYOF_LOC_REQ_BIT (if
410 * an extra node type for it hasn't been created) and/or the ANYOF_LOC_FOLD
411 * bits could be moved there. The downside of this is that ANYOFL nodes with
412 * whichever of the bits get moved would have to have the extra space always
415 * If three bits are required, one could additionally make a node type for
416 * ANYOFL_LARGE, removing that as a bit, and move both the above bits to that
417 * extra word. There isn't an SSC problem as all SSCs are this large anyway,
418 * and the SSC could be set to this node type. REGINCLASS would have to be
419 * modified so that if the node type were this, it would call reginclass().
420 * as the flag bit that does this now would be gone.
422 * Several flags are not used in synthetic start class (SSC) nodes, so could be
423 * shared should new flags be needed for SSCs, like SSC_MATCHES_EMPTY_STRING
426 /* If this is set, the result of the match should be complemented. regexec.c
427 * is expecting this to be in the low bit. Never in an SSC */
428 #define ANYOF_INVERT 0x01
430 /* For the SSC node only, which cannot be inverted, so is shared with that bit.
431 * This is used only during regex compilation. */
432 #define SSC_MATCHES_EMPTY_STRING ANYOF_INVERT
434 /* Set if this is a regnode_charclass_posixl vs a regnode_charclass. This
435 * is used for runtime \d, \w, [:posix:], ..., which are used only in locale
436 * and the optimizer's synthetic start class. Non-locale \d, etc are resolved
437 * at compile-time. Only set under /l; can be in SSC */
438 #define ANYOF_MATCHES_POSIXL 0x02
440 /* The fold is calculated and stored in the bitmap where possible at compile
441 * time. However under locale, the actual folding varies depending on
442 * what the locale is at the time of execution, so it has to be deferred until
443 * then. Only set under /l; never in an SSC */
444 #define ANYOF_LOC_FOLD 0x04
446 /* If set, means to warn if runtime locale isn't a UTF-8 one. Only under /l.
447 * If set, none of INVERT, LOC_FOLD, POSIXL, HAS_NONBITMAP_NON_UTF8_MATCHES can
448 * be set. Can be in an SSC */
449 #define ANYOF_LOC_REQ_UTF8 0x08
451 /* If set, the node matches every code point NUM_ANYOF_CODE_POINTS and above.
452 * Can be in an SSC */
453 #define ANYOF_MATCHES_ALL_ABOVE_BITMAP 0x10
455 /* If set, the node can match something outside the bitmap that isn't in utf8;
456 * never set under /d nor in an SSC */
457 #define ANYOF_HAS_NONBITMAP_NON_UTF8_MATCHES 0x20
459 /* Are there things outside the bitmap that will match only if the target
460 * string is encoded in UTF-8? (This is not set if ANYOF_ABOVE_BITMAP_ALL is
461 * set). Can be in SSC */
462 #define ANYOF_HAS_UTF8_NONBITMAP_MATCHES 0x40
465 * Under /d it means the ANYOFD node matches all non-ASCII Latin1
466 * characters when the target string is not in utf8.
467 * When not under /d, it means the ANYOF node should raise a warning if
468 * matching against an above-Unicode code point.
469 * (These uses are mutually exclusive because the warning requires a \p{}, and
470 * \p{} implies /u which deselects /d). An SSC node only has this bit set if
471 * what is meant is the warning. The long macro name is to make sure that you
472 * are cautioned about its shared nature */
473 #define ANYOF_SHARED_d_MATCHES_ALL_NON_UTF8_NON_ASCII_non_d_WARN_SUPER 0x80
475 #define ANYOF_FLAGS_ALL (0xff)
477 #define ANYOF_LOCALE_FLAGS (ANYOF_LOC_FOLD | ANYOF_MATCHES_POSIXL)
479 /* These are the flags that apply to both regular ANYOF nodes and synthetic
480 * start class nodes during construction of the SSC. During finalization of
481 * the SSC, other of the flags may get added to it */
482 #define ANYOF_COMMON_FLAGS ( ANYOF_HAS_UTF8_NONBITMAP_MATCHES \
485 /* Character classes for node->classflags of ANYOF */
486 /* Should be synchronized with a table in regprop() */
487 /* 2n should be the normal one, paired with its complement at 2n+1 */
489 #define ANYOF_ALPHA ((_CC_ALPHA) * 2)
490 #define ANYOF_NALPHA ((ANYOF_ALPHA) + 1)
491 #define ANYOF_ALPHANUMERIC ((_CC_ALPHANUMERIC) * 2) /* [[:alnum:]] isalnum(3), utf8::IsAlnum */
492 #define ANYOF_NALPHANUMERIC ((ANYOF_ALPHANUMERIC) + 1)
493 #define ANYOF_ASCII ((_CC_ASCII) * 2)
494 #define ANYOF_NASCII ((ANYOF_ASCII) + 1)
495 #define ANYOF_BLANK ((_CC_BLANK) * 2) /* GNU extension: space and tab: non-vertical space */
496 #define ANYOF_NBLANK ((ANYOF_BLANK) + 1)
497 #define ANYOF_CASED ((_CC_CASED) * 2) /* Pseudo class for [:lower:] or
498 [:upper:] under /i */
499 #define ANYOF_NCASED ((ANYOF_CASED) + 1)
500 #define ANYOF_CNTRL ((_CC_CNTRL) * 2)
501 #define ANYOF_NCNTRL ((ANYOF_CNTRL) + 1)
502 #define ANYOF_DIGIT ((_CC_DIGIT) * 2) /* \d */
503 #define ANYOF_NDIGIT ((ANYOF_DIGIT) + 1)
504 #define ANYOF_GRAPH ((_CC_GRAPH) * 2)
505 #define ANYOF_NGRAPH ((ANYOF_GRAPH) + 1)
506 #define ANYOF_LOWER ((_CC_LOWER) * 2)
507 #define ANYOF_NLOWER ((ANYOF_LOWER) + 1)
508 #define ANYOF_PRINT ((_CC_PRINT) * 2)
509 #define ANYOF_NPRINT ((ANYOF_PRINT) + 1)
510 #define ANYOF_PUNCT ((_CC_PUNCT) * 2)
511 #define ANYOF_NPUNCT ((ANYOF_PUNCT) + 1)
512 #define ANYOF_SPACE ((_CC_SPACE) * 2) /* \s */
513 #define ANYOF_NSPACE ((ANYOF_SPACE) + 1)
514 #define ANYOF_UPPER ((_CC_UPPER) * 2)
515 #define ANYOF_NUPPER ((ANYOF_UPPER) + 1)
516 #define ANYOF_WORDCHAR ((_CC_WORDCHAR) * 2) /* \w, PL_utf8_alnum, utf8::IsWord, ALNUM */
517 #define ANYOF_NWORDCHAR ((ANYOF_WORDCHAR) + 1)
518 #define ANYOF_XDIGIT ((_CC_XDIGIT) * 2)
519 #define ANYOF_NXDIGIT ((ANYOF_XDIGIT) + 1)
521 /* pseudo classes below this, not stored in the class bitmap, but used as flags
522 during compilation of char classes */
524 #define ANYOF_VERTWS ((_CC_VERTSPACE) * 2)
525 #define ANYOF_NVERTWS ((ANYOF_VERTWS)+1)
527 /* It is best if this is the last one, as all above it are stored as bits in a
528 * bitmap, and it isn't part of that bitmap */
529 #if _CC_VERTSPACE != _HIGHEST_REGCOMP_DOT_H_SYNC
530 # error Problem with handy.h _HIGHEST_REGCOMP_DOT_H_SYNC #define
533 #define ANYOF_POSIXL_MAX (ANYOF_VERTWS) /* So upper loop limit is written:
535 * Hence doesn't include VERTWS, as that
536 * is a pseudo class */
537 #define ANYOF_MAX ANYOF_POSIXL_MAX
539 #if (ANYOF_POSIXL_MAX > 32) /* Must fit in 32-bit word */
540 # error Problem with handy.h _CC_foo #defines
543 #define ANYOF_HORIZWS ((ANYOF_POSIXL_MAX)+2) /* = (ANYOF_NVERTWS + 1) */
544 #define ANYOF_NHORIZWS ((ANYOF_POSIXL_MAX)+3)
546 #define ANYOF_UNIPROP ((ANYOF_POSIXL_MAX)+4) /* Used to indicate a Unicode
547 property: \p{} or \P{} */
549 /* Backward source code compatibility. */
551 #define ANYOF_ALNUML ANYOF_ALNUM
552 #define ANYOF_NALNUML ANYOF_NALNUM
553 #define ANYOF_SPACEL ANYOF_SPACE
554 #define ANYOF_NSPACEL ANYOF_NSPACE
555 #define ANYOF_ALNUM ANYOF_WORDCHAR
556 #define ANYOF_NALNUM ANYOF_NWORDCHAR
558 /* Utility macros for the bitmap and classes of ANYOF */
560 #define ANYOF_FLAGS(p) ((p)->flags)
562 #define ANYOF_BIT(c) (1U << ((c) & 7))
564 #define ANYOF_POSIXL_SET(p, c) (((regnode_charclass_posixl*) (p))->classflags |= (1U << (c)))
565 #define ANYOF_CLASS_SET(p, c) ANYOF_POSIXL_SET((p), (c))
567 #define ANYOF_POSIXL_CLEAR(p, c) (((regnode_charclass_posixl*) (p))->classflags &= ~ (1U <<(c)))
568 #define ANYOF_CLASS_CLEAR(p, c) ANYOF_POSIXL_CLEAR((p), (c))
570 #define ANYOF_POSIXL_TEST(p, c) (((regnode_charclass_posixl*) (p))->classflags & (1U << (c)))
571 #define ANYOF_CLASS_TEST(p, c) ANYOF_POSIXL_TEST((p), (c))
573 #define ANYOF_POSIXL_ZERO(ret) STMT_START { ((regnode_charclass_posixl*) (ret))->classflags = 0; } STMT_END
574 #define ANYOF_CLASS_ZERO(ret) ANYOF_POSIXL_ZERO(ret)
576 /* Shifts a bit to get, eg. 0x4000_0000, then subtracts 1 to get 0x3FFF_FFFF */
577 #define ANYOF_POSIXL_SETALL(ret) STMT_START { ((regnode_charclass_posixl*) (ret))->classflags = ((1U << ((ANYOF_POSIXL_MAX) - 1))) - 1; } STMT_END
578 #define ANYOF_CLASS_SETALL(ret) ANYOF_POSIXL_SETALL(ret)
580 #define ANYOF_POSIXL_TEST_ANY_SET(p) \
581 ((ANYOF_FLAGS(p) & ANYOF_MATCHES_POSIXL) \
582 && (((regnode_charclass_posixl*)(p))->classflags))
583 #define ANYOF_CLASS_TEST_ANY_SET(p) ANYOF_POSIXL_TEST_ANY_SET(p)
585 /* Since an SSC always has this field, we don't have to test for that; nor do
586 * we want to because the bit isn't set for SSC during its construction */
587 #define ANYOF_POSIXL_SSC_TEST_ANY_SET(p) \
588 cBOOL(((regnode_ssc*)(p))->classflags)
589 #define ANYOF_POSIXL_SSC_TEST_ALL_SET(p) /* Are all bits set? */ \
590 (((regnode_ssc*) (p))->classflags \
591 == ((1U << ((ANYOF_POSIXL_MAX) - 1))) - 1)
593 #define ANYOF_POSIXL_TEST_ALL_SET(p) \
594 ((ANYOF_FLAGS(p) & ANYOF_MATCHES_POSIXL) \
595 && ((regnode_charclass_posixl*) (p))->classflags \
596 == ((1U << ((ANYOF_POSIXL_MAX) - 1))) - 1)
598 #define ANYOF_POSIXL_OR(source, dest) STMT_START { (dest)->classflags |= (source)->classflags ; } STMT_END
599 #define ANYOF_CLASS_OR(source, dest) ANYOF_POSIXL_OR((source), (dest))
601 #define ANYOF_POSIXL_AND(source, dest) STMT_START { (dest)->classflags &= (source)->classflags ; } STMT_END
603 #define ANYOF_BITMAP_ZERO(ret) Zero(((struct regnode_charclass*)(ret))->bitmap, ANYOF_BITMAP_SIZE, char)
604 #define ANYOF_BITMAP(p) (((struct regnode_charclass*)(p))->bitmap)
605 #define ANYOF_BITMAP_BYTE(p, c) (ANYOF_BITMAP(p)[(((U8)(c)) >> 3) & 31])
606 #define ANYOF_BITMAP_SET(p, c) (ANYOF_BITMAP_BYTE(p, c) |= ANYOF_BIT(c))
607 #define ANYOF_BITMAP_CLEAR(p,c) (ANYOF_BITMAP_BYTE(p, c) &= ~ANYOF_BIT(c))
608 #define ANYOF_BITMAP_TEST(p, c) cBOOL(ANYOF_BITMAP_BYTE(p, c) & ANYOF_BIT(c))
610 #define ANYOF_BITMAP_SETALL(p) \
611 memset (ANYOF_BITMAP(p), 255, ANYOF_BITMAP_SIZE)
612 #define ANYOF_BITMAP_CLEARALL(p) \
613 Zero (ANYOF_BITMAP(p), ANYOF_BITMAP_SIZE)
615 #define ANYOF_SKIP EXTRA_SIZE(struct regnode_charclass)
616 #define ANYOF_POSIXL_SKIP EXTRA_SIZE(regnode_charclass_posixl)
619 * Utility definitions.
622 # define UCHARAT(p) ((int)*(const U8*)(p))
624 # define UCHARAT(p) ((int)*(p)&CHARMASK)
627 #define EXTRA_SIZE(guy) ((sizeof(guy)-1)/sizeof(struct regnode))
629 #define REG_ZERO_LEN_SEEN 0x00000001
630 #define REG_LOOKBEHIND_SEEN 0x00000002
631 #define REG_GPOS_SEEN 0x00000004
633 #define REG_RECURSE_SEEN 0x00000020
634 #define REG_TOP_LEVEL_BRANCHES_SEEN 0x00000040
635 #define REG_VERBARG_SEEN 0x00000080
636 #define REG_CUTGROUP_SEEN 0x00000100
637 #define REG_RUN_ON_COMMENT_SEEN 0x00000200
638 #define REG_UNFOLDED_MULTI_SEEN 0x00000400
639 #define REG_GOSTART_SEEN 0x00000800
640 #define REG_UNBOUNDED_QUANTIFIER_SEEN 0x00001000
645 #ifdef PLUGGABLE_RE_EXTENSION
646 #include "re_nodes.h"
648 #include "regnodes.h"
651 #ifndef PLUGGABLE_RE_EXTENSION
653 EXTCONST regexp_engine PL_core_reg_engine;
655 EXTCONST regexp_engine PL_core_reg_engine = {
658 Perl_re_intuit_start,
659 Perl_re_intuit_string,
660 Perl_regfree_internal,
661 Perl_reg_numbered_buff_fetch,
662 Perl_reg_numbered_buff_store,
663 Perl_reg_numbered_buff_length,
665 Perl_reg_named_buff_iter,
667 #if defined(USE_ITHREADS)
668 Perl_regdupe_internal,
673 #endif /* PLUGGABLE_RE_EXTENSION */
679 /* .what is a character array with one character for each member of .data
680 * The character describes the function of the corresponding .data item:
681 * a - AV for paren_name_list under DEBUGGING
682 * f - start-class data for regstclass optimization
683 * l - start op for literal (?{EVAL}) item
684 * L - start op for literal (?{EVAL}) item, with separate CV (qr//)
685 * r - pointer to an embedded code-containing qr, e.g. /ab$qr/
686 * s - swash for Unicode-style character class, and the multicharacter
687 * strings resulting from casefolding the single-character entries
688 * in the character class
690 * u - trie struct's widecharmap (a HV, so can't share, must dup)
691 * also used for revcharmap and words under DEBUGGING
692 * T - aho-trie struct
693 * S - sv for named capture lookup
694 * 20010712 mjd@plover.com
695 * (Remember to update re_dup() and pregfree() if you add any items.)
703 /* Code in S_to_utf8_substr() and S_to_byte_substr() in regexec.c accesses
704 anchored* and float* via array indexes 0 and 1. */
705 #define anchored_substr substrs->data[0].substr
706 #define anchored_utf8 substrs->data[0].utf8_substr
707 #define anchored_offset substrs->data[0].min_offset
708 #define anchored_end_shift substrs->data[0].end_shift
710 #define float_substr substrs->data[1].substr
711 #define float_utf8 substrs->data[1].utf8_substr
712 #define float_min_offset substrs->data[1].min_offset
713 #define float_max_offset substrs->data[1].max_offset
714 #define float_end_shift substrs->data[1].end_shift
716 #define check_substr substrs->data[2].substr
717 #define check_utf8 substrs->data[2].utf8_substr
718 #define check_offset_min substrs->data[2].min_offset
719 #define check_offset_max substrs->data[2].max_offset
720 #define check_end_shift substrs->data[2].end_shift
722 #define RX_ANCHORED_SUBSTR(rx) (ReANY(rx)->anchored_substr)
723 #define RX_ANCHORED_UTF8(rx) (ReANY(rx)->anchored_utf8)
724 #define RX_FLOAT_SUBSTR(rx) (ReANY(rx)->float_substr)
725 #define RX_FLOAT_UTF8(rx) (ReANY(rx)->float_utf8)
727 /* trie related stuff */
729 /* a transition record for the state machine. the
730 check field determines which state "owns" the
731 transition. the char the transition is for is
732 determined by offset from the owning states base
733 field. the next field determines which state
734 is to be transitioned to if any.
736 struct _reg_trie_trans {
741 /* a transition list element for the list based representation */
742 struct _reg_trie_trans_list_elem {
746 typedef struct _reg_trie_trans_list_elem reg_trie_trans_le;
748 /* a state for compressed nodes. base is an offset
749 into an array of reg_trie_trans array. If wordnum is
750 nonzero the state is accepting. if base is zero then
751 the state has no children (and will be accepting)
753 struct _reg_trie_state {
757 reg_trie_trans_le* list;
761 /* info per word; indexed by wordnum */
763 U16 prev; /* previous word in acceptance chain; eg in
764 * zzz|abc|ab/ after matching the chars abc, the
765 * accepted word is #2, and the previous accepted
767 U32 len; /* how many chars long is this word? */
768 U32 accept; /* accept state for this word */
772 typedef struct _reg_trie_state reg_trie_state;
773 typedef struct _reg_trie_trans reg_trie_trans;
776 /* anything in here that needs to be freed later
777 should be dealt with in pregfree.
778 refcount is first in both this and _reg_ac_data to allow a space
779 optimisation in Perl_regdupe. */
780 struct _reg_trie_data {
781 U32 refcount; /* number of times this trie is referenced */
782 U32 lasttrans; /* last valid transition element */
783 U16 *charmap; /* byte to charid lookup array */
784 reg_trie_state *states; /* state data */
785 reg_trie_trans *trans; /* array of transition elements */
786 char *bitmap; /* stclass bitmap */
787 U16 *jump; /* optional 1 indexed array of offsets before tail
788 for the node following a given word. */
789 reg_trie_wordinfo *wordinfo; /* array of info per word */
790 U16 uniquecharcount; /* unique chars in trie (width of trans table) */
791 U32 startstate; /* initial state - used for common prefix optimisation */
792 STRLEN minlen; /* minimum length of words in trie - build/opt only? */
793 STRLEN maxlen; /* maximum length of words in trie - build/opt only? */
794 U32 prefixlen; /* #chars in common prefix */
795 U32 statecount; /* Build only - number of states in the states array
796 (including the unused zero state) */
797 U32 wordcount; /* Build only */
799 STRLEN charcount; /* Build only */
802 /* There is one (3 under DEBUGGING) pointers that logically belong in this
803 structure, but are held outside as they need duplication on thread cloning,
804 whereas the rest of the structure can be read only:
805 HV *widecharmap; code points > 255 to charid
807 AV *words; Array of words contained in trie, for dumping
808 AV *revcharmap; Map of each charid back to its character representation
812 #define TRIE_WORDS_OFFSET 2
814 typedef struct _reg_trie_data reg_trie_data;
816 /* refcount is first in both this and _reg_trie_data to allow a space
817 optimisation in Perl_regdupe. */
818 struct _reg_ac_data {
822 reg_trie_state *states;
824 typedef struct _reg_ac_data reg_ac_data;
826 /* ANY_BIT doesn't use the structure, so we can borrow it here.
827 This is simpler than refactoring all of it as wed end up with
828 three different sets... */
830 #define TRIE_BITMAP(p) (((reg_trie_data *)(p))->bitmap)
831 #define TRIE_BITMAP_BYTE(p, c) (TRIE_BITMAP(p)[(((U8)(c)) >> 3) & 31])
832 #define TRIE_BITMAP_SET(p, c) (TRIE_BITMAP_BYTE(p, c) |= ANYOF_BIT((U8)c))
833 #define TRIE_BITMAP_CLEAR(p,c) (TRIE_BITMAP_BYTE(p, c) &= ~ANYOF_BIT((U8)c))
834 #define TRIE_BITMAP_TEST(p, c) (TRIE_BITMAP_BYTE(p, c) & ANYOF_BIT((U8)c))
836 #define IS_ANYOF_TRIE(op) ((op)==TRIEC || (op)==AHOCORASICKC)
837 #define IS_TRIE_AC(op) ((op)>=AHOCORASICK)
840 #define BITMAP_BYTE(p, c) (((U8*)p)[(((U8)(c)) >> 3) & 31])
841 #define BITMAP_TEST(p, c) (BITMAP_BYTE(p, c) & ANYOF_BIT((U8)c))
843 /* these defines assume uniquecharcount is the correct variable, and state may be evaluated twice */
844 #define TRIE_NODENUM(state) (((state)-1)/(trie->uniquecharcount)+1)
845 #define SAFE_TRIE_NODENUM(state) ((state) ? (((state)-1)/(trie->uniquecharcount)+1) : (state))
846 #define TRIE_NODEIDX(state) ((state) ? (((state)-1)*(trie->uniquecharcount)+1) : (state))
849 #define TRIE_CHARCOUNT(trie) ((trie)->charcount)
851 #define TRIE_CHARCOUNT(trie) (trie_charcount)
854 #define RE_TRIE_MAXBUF_INIT 65536
855 #define RE_TRIE_MAXBUF_NAME "\022E_TRIE_MAXBUF"
856 #define RE_DEBUG_FLAGS "\022E_DEBUG_FLAGS"
860 RE_DEBUG_FLAGS is used to control what debug output is emitted
861 its divided into three groups of options, some of which interact.
862 The three groups are: Compile, Execute, Extra. There is room for a
863 further group, as currently only the low three bytes are used.
884 If you modify any of these make sure you make corresponding changes to
885 re.pm, especially to the documentation.
891 #define RE_DEBUG_COMPILE_MASK 0x0000FF
892 #define RE_DEBUG_COMPILE_PARSE 0x000001
893 #define RE_DEBUG_COMPILE_OPTIMISE 0x000002
894 #define RE_DEBUG_COMPILE_TRIE 0x000004
895 #define RE_DEBUG_COMPILE_DUMP 0x000008
896 #define RE_DEBUG_COMPILE_FLAGS 0x000010
897 #define RE_DEBUG_COMPILE_TEST 0x000020
900 #define RE_DEBUG_EXECUTE_MASK 0x00FF00
901 #define RE_DEBUG_EXECUTE_INTUIT 0x000100
902 #define RE_DEBUG_EXECUTE_MATCH 0x000200
903 #define RE_DEBUG_EXECUTE_TRIE 0x000400
906 #define RE_DEBUG_EXTRA_MASK 0xFF0000
907 #define RE_DEBUG_EXTRA_TRIE 0x010000
908 #define RE_DEBUG_EXTRA_OFFSETS 0x020000
909 #define RE_DEBUG_EXTRA_OFFDEBUG 0x040000
910 #define RE_DEBUG_EXTRA_STATE 0x080000
911 #define RE_DEBUG_EXTRA_OPTIMISE 0x100000
912 #define RE_DEBUG_EXTRA_BUFFERS 0x400000
913 #define RE_DEBUG_EXTRA_GPOS 0x800000
915 #define RE_DEBUG_EXTRA_STACK 0x280000
917 #define RE_DEBUG_FLAG(x) (re_debug_flags & x)
919 #define DEBUG_COMPILE_r(x) DEBUG_r( \
920 if (re_debug_flags & RE_DEBUG_COMPILE_MASK) x )
921 #define DEBUG_PARSE_r(x) DEBUG_r( \
922 if (re_debug_flags & RE_DEBUG_COMPILE_PARSE) x )
923 #define DEBUG_OPTIMISE_r(x) DEBUG_r( \
924 if (re_debug_flags & RE_DEBUG_COMPILE_OPTIMISE) x )
925 #define DEBUG_PARSE_r(x) DEBUG_r( \
926 if (re_debug_flags & RE_DEBUG_COMPILE_PARSE) x )
927 #define DEBUG_DUMP_r(x) DEBUG_r( \
928 if (re_debug_flags & RE_DEBUG_COMPILE_DUMP) x )
929 #define DEBUG_TRIE_COMPILE_r(x) DEBUG_r( \
930 if (re_debug_flags & RE_DEBUG_COMPILE_TRIE) x )
931 #define DEBUG_FLAGS_r(x) DEBUG_r( \
932 if (re_debug_flags & RE_DEBUG_COMPILE_FLAGS) x )
933 #define DEBUG_TEST_r(x) DEBUG_r( \
934 if (re_debug_flags & RE_DEBUG_COMPILE_TEST) x )
936 #define DEBUG_EXECUTE_r(x) DEBUG_r( \
937 if (re_debug_flags & RE_DEBUG_EXECUTE_MASK) x )
938 #define DEBUG_INTUIT_r(x) DEBUG_r( \
939 if (re_debug_flags & RE_DEBUG_EXECUTE_INTUIT) x )
940 #define DEBUG_MATCH_r(x) DEBUG_r( \
941 if (re_debug_flags & RE_DEBUG_EXECUTE_MATCH) x )
942 #define DEBUG_TRIE_EXECUTE_r(x) DEBUG_r( \
943 if (re_debug_flags & RE_DEBUG_EXECUTE_TRIE) x )
946 #define DEBUG_EXTRA_r(x) DEBUG_r( \
947 if (re_debug_flags & RE_DEBUG_EXTRA_MASK) x )
948 #define DEBUG_OFFSETS_r(x) DEBUG_r( \
949 if (re_debug_flags & RE_DEBUG_EXTRA_OFFSETS) x )
950 #define DEBUG_STATE_r(x) DEBUG_r( \
951 if (re_debug_flags & RE_DEBUG_EXTRA_STATE) x )
952 #define DEBUG_STACK_r(x) DEBUG_r( \
953 if (re_debug_flags & RE_DEBUG_EXTRA_STACK) x )
954 #define DEBUG_BUFFERS_r(x) DEBUG_r( \
955 if (re_debug_flags & RE_DEBUG_EXTRA_BUFFERS) x )
957 #define DEBUG_OPTIMISE_MORE_r(x) DEBUG_r( \
958 if ((RE_DEBUG_EXTRA_OPTIMISE|RE_DEBUG_COMPILE_OPTIMISE) == \
959 (re_debug_flags & (RE_DEBUG_EXTRA_OPTIMISE|RE_DEBUG_COMPILE_OPTIMISE)) ) x )
960 #define MJD_OFFSET_DEBUG(x) DEBUG_r( \
961 if (re_debug_flags & RE_DEBUG_EXTRA_OFFDEBUG) \
962 Perl_warn_nocontext x )
963 #define DEBUG_TRIE_COMPILE_MORE_r(x) DEBUG_TRIE_COMPILE_r( \
964 if (re_debug_flags & RE_DEBUG_EXTRA_TRIE) x )
965 #define DEBUG_TRIE_EXECUTE_MORE_r(x) DEBUG_TRIE_EXECUTE_r( \
966 if (re_debug_flags & RE_DEBUG_EXTRA_TRIE) x )
968 #define DEBUG_TRIE_r(x) DEBUG_r( \
969 if (re_debug_flags & (RE_DEBUG_COMPILE_TRIE \
970 | RE_DEBUG_EXECUTE_TRIE )) x )
971 #define DEBUG_GPOS_r(x) DEBUG_r( \
972 if (re_debug_flags & RE_DEBUG_EXTRA_GPOS) x )
975 /* get_sv() can return NULL during global destruction. */
976 #define GET_RE_DEBUG_FLAGS DEBUG_r({ \
977 SV * re_debug_flags_sv = NULL; \
978 re_debug_flags_sv = get_sv(RE_DEBUG_FLAGS, 1); \
979 if (re_debug_flags_sv) { \
980 if (!SvIOK(re_debug_flags_sv)) \
981 sv_setuv(re_debug_flags_sv, RE_DEBUG_COMPILE_DUMP | RE_DEBUG_EXECUTE_MASK ); \
982 re_debug_flags=SvIV(re_debug_flags_sv); \
988 #define GET_RE_DEBUG_FLAGS_DECL VOL IV re_debug_flags = 0; \
989 PERL_UNUSED_VAR(re_debug_flags); GET_RE_DEBUG_FLAGS;
991 #define RE_PV_COLOR_DECL(rpv,rlen,isuni,dsv,pv,l,m,c1,c2) \
992 const char * const rpv = \
993 pv_pretty((dsv), (pv), (l), (m), \
994 PL_colors[(c1)],PL_colors[(c2)], \
995 PERL_PV_ESCAPE_RE|PERL_PV_ESCAPE_NONASCII |((isuni) ? PERL_PV_ESCAPE_UNI : 0) ); \
996 const int rlen = SvCUR(dsv)
998 #define RE_SV_ESCAPE(rpv,isuni,dsv,sv,m) \
999 const char * const rpv = \
1000 pv_pretty((dsv), (SvPV_nolen_const(sv)), (SvCUR(sv)), (m), \
1001 PL_colors[(c1)],PL_colors[(c2)], \
1002 PERL_PV_ESCAPE_RE|PERL_PV_ESCAPE_NONASCII |((isuni) ? PERL_PV_ESCAPE_UNI : 0) )
1004 #define RE_PV_QUOTED_DECL(rpv,isuni,dsv,pv,l,m) \
1005 const char * const rpv = \
1006 pv_pretty((dsv), (pv), (l), (m), \
1007 PL_colors[0], PL_colors[1], \
1008 ( PERL_PV_PRETTY_QUOTE | PERL_PV_ESCAPE_RE | PERL_PV_ESCAPE_NONASCII | PERL_PV_PRETTY_ELLIPSES | \
1009 ((isuni) ? PERL_PV_ESCAPE_UNI : 0)) \
1012 #define RE_SV_DUMPLEN(ItEm) (SvCUR(ItEm) - (SvTAIL(ItEm)!=0))
1013 #define RE_SV_TAIL(ItEm) (SvTAIL(ItEm) ? "$" : "")
1015 #else /* if not DEBUGGING */
1017 #define GET_RE_DEBUG_FLAGS_DECL
1018 #define RE_PV_COLOR_DECL(rpv,rlen,isuni,dsv,pv,l,m,c1,c2)
1019 #define RE_SV_ESCAPE(rpv,isuni,dsv,sv,m)
1020 #define RE_PV_QUOTED_DECL(rpv,isuni,dsv,pv,l,m)
1021 #define RE_SV_DUMPLEN(ItEm)
1022 #define RE_SV_TAIL(ItEm)
1024 #endif /* DEBUG RELATED DEFINES */
1027 TRADITIONAL_BOUND = _CC_WORDCHAR,
1034 * ex: set ts=8 sts=4 sw=4 et: