| 1 | /* regexec.c |
| 2 | */ |
| 3 | |
| 4 | /* |
| 5 | * "One Ring to rule them all, One Ring to find them..." |
| 6 | */ |
| 7 | |
| 8 | /* This file contains functions for executing a regular expression. See |
| 9 | * also regcomp.c which funnily enough, contains functions for compiling |
| 10 | * a regular expression. |
| 11 | * |
| 12 | * This file is also copied at build time to ext/re/re_exec.c, where |
| 13 | * it's built with -DPERL_EXT_RE_BUILD -DPERL_EXT_RE_DEBUG -DPERL_EXT. |
| 14 | * This causes the main functions to be compiled under new names and with |
| 15 | * debugging support added, which makes "use re 'debug'" work. |
| 16 | */ |
| 17 | |
| 18 | /* NOTE: this is derived from Henry Spencer's regexp code, and should not |
| 19 | * confused with the original package (see point 3 below). Thanks, Henry! |
| 20 | */ |
| 21 | |
| 22 | /* Additional note: this code is very heavily munged from Henry's version |
| 23 | * in places. In some spots I've traded clarity for efficiency, so don't |
| 24 | * blame Henry for some of the lack of readability. |
| 25 | */ |
| 26 | |
| 27 | /* The names of the functions have been changed from regcomp and |
| 28 | * regexec to pregcomp and pregexec in order to avoid conflicts |
| 29 | * with the POSIX routines of the same names. |
| 30 | */ |
| 31 | |
| 32 | #ifdef PERL_EXT_RE_BUILD |
| 33 | #include "re_top.h" |
| 34 | #endif |
| 35 | |
| 36 | /* |
| 37 | * pregcomp and pregexec -- regsub and regerror are not used in perl |
| 38 | * |
| 39 | * Copyright (c) 1986 by University of Toronto. |
| 40 | * Written by Henry Spencer. Not derived from licensed software. |
| 41 | * |
| 42 | * Permission is granted to anyone to use this software for any |
| 43 | * purpose on any computer system, and to redistribute it freely, |
| 44 | * subject to the following restrictions: |
| 45 | * |
| 46 | * 1. The author is not responsible for the consequences of use of |
| 47 | * this software, no matter how awful, even if they arise |
| 48 | * from defects in it. |
| 49 | * |
| 50 | * 2. The origin of this software must not be misrepresented, either |
| 51 | * by explicit claim or by omission. |
| 52 | * |
| 53 | * 3. Altered versions must be plainly marked as such, and must not |
| 54 | * be misrepresented as being the original software. |
| 55 | * |
| 56 | **** Alterations to Henry's code are... |
| 57 | **** |
| 58 | **** Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 59 | **** 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 by Larry Wall and others |
| 60 | **** |
| 61 | **** You may distribute under the terms of either the GNU General Public |
| 62 | **** License or the Artistic License, as specified in the README file. |
| 63 | * |
| 64 | * Beware that some of this code is subtly aware of the way operator |
| 65 | * precedence is structured in regular expressions. Serious changes in |
| 66 | * regular-expression syntax might require a total rethink. |
| 67 | */ |
| 68 | #include "EXTERN.h" |
| 69 | #define PERL_IN_REGEXEC_C |
| 70 | #include "perl.h" |
| 71 | |
| 72 | #ifdef PERL_IN_XSUB_RE |
| 73 | # include "re_comp.h" |
| 74 | #else |
| 75 | # include "regcomp.h" |
| 76 | #endif |
| 77 | |
| 78 | #define RF_tainted 1 /* tainted information used? */ |
| 79 | #define RF_warned 2 /* warned about big count? */ |
| 80 | |
| 81 | #define RF_utf8 8 /* Pattern contains multibyte chars? */ |
| 82 | |
| 83 | #define UTF ((PL_reg_flags & RF_utf8) != 0) |
| 84 | |
| 85 | #define RS_init 1 /* eval environment created */ |
| 86 | #define RS_set 2 /* replsv value is set */ |
| 87 | |
| 88 | #ifndef STATIC |
| 89 | #define STATIC static |
| 90 | #endif |
| 91 | |
| 92 | #define REGINCLASS(prog,p,c) (ANYOF_FLAGS(p) ? reginclass(prog,p,c,0,0) : ANYOF_BITMAP_TEST(p,*(c))) |
| 93 | |
| 94 | /* |
| 95 | * Forwards. |
| 96 | */ |
| 97 | |
| 98 | #define CHR_SVLEN(sv) (do_utf8 ? sv_len_utf8(sv) : SvCUR(sv)) |
| 99 | #define CHR_DIST(a,b) (PL_reg_match_utf8 ? utf8_distance(a,b) : a - b) |
| 100 | |
| 101 | #define HOPc(pos,off) \ |
| 102 | (char *)(PL_reg_match_utf8 \ |
| 103 | ? reghop3((U8*)pos, off, (U8*)(off >= 0 ? PL_regeol : PL_bostr)) \ |
| 104 | : (U8*)(pos + off)) |
| 105 | #define HOPBACKc(pos, off) \ |
| 106 | (char*)(PL_reg_match_utf8\ |
| 107 | ? reghopmaybe3((U8*)pos, -off, (U8*)PL_bostr) \ |
| 108 | : (pos - off >= PL_bostr) \ |
| 109 | ? (U8*)pos - off \ |
| 110 | : NULL) |
| 111 | |
| 112 | #define HOP3(pos,off,lim) (PL_reg_match_utf8 ? reghop3((U8*)(pos), off, (U8*)(lim)) : (U8*)(pos + off)) |
| 113 | #define HOP3c(pos,off,lim) ((char*)HOP3(pos,off,lim)) |
| 114 | |
| 115 | #define LOAD_UTF8_CHARCLASS(class,str) STMT_START { \ |
| 116 | if (!CAT2(PL_utf8_,class)) { bool ok; ENTER; save_re_context(); ok=CAT2(is_utf8_,class)((const U8*)str); assert(ok); LEAVE; } } STMT_END |
| 117 | #define LOAD_UTF8_CHARCLASS_ALNUM() LOAD_UTF8_CHARCLASS(alnum,"a") |
| 118 | #define LOAD_UTF8_CHARCLASS_DIGIT() LOAD_UTF8_CHARCLASS(digit,"0") |
| 119 | #define LOAD_UTF8_CHARCLASS_SPACE() LOAD_UTF8_CHARCLASS(space," ") |
| 120 | #define LOAD_UTF8_CHARCLASS_MARK() LOAD_UTF8_CHARCLASS(mark, "\xcd\x86") |
| 121 | |
| 122 | /* TODO: Combine JUMPABLE and HAS_TEXT to cache OP(rn) */ |
| 123 | |
| 124 | /* for use after a quantifier and before an EXACT-like node -- japhy */ |
| 125 | /* it would be nice to rework regcomp.sym to generate this stuff. sigh */ |
| 126 | #define JUMPABLE(rn) ( \ |
| 127 | OP(rn) == OPEN || \ |
| 128 | (OP(rn) == CLOSE && (!cur_eval || cur_eval->u.eval.close_paren != ARG(rn))) || \ |
| 129 | OP(rn) == EVAL || \ |
| 130 | OP(rn) == SUSPEND || OP(rn) == IFMATCH || \ |
| 131 | OP(rn) == PLUS || OP(rn) == MINMOD || \ |
| 132 | OP(rn) == KEEPS || (PL_regkind[OP(rn)] == VERB) || \ |
| 133 | (PL_regkind[OP(rn)] == CURLY && ARG1(rn) > 0) \ |
| 134 | ) |
| 135 | #define IS_EXACT(rn) (PL_regkind[OP(rn)] == EXACT) |
| 136 | |
| 137 | #define HAS_TEXT(rn) ( IS_EXACT(rn) || PL_regkind[OP(rn)] == REF ) |
| 138 | |
| 139 | #if 0 |
| 140 | /* Currently these are only used when PL_regkind[OP(rn)] == EXACT so |
| 141 | we don't need this definition. */ |
| 142 | #define IS_TEXT(rn) ( OP(rn)==EXACT || OP(rn)==REF || OP(rn)==NREF ) |
| 143 | #define IS_TEXTF(rn) ( OP(rn)==EXACTF || OP(rn)==REFF || OP(rn)==NREFF ) |
| 144 | #define IS_TEXTFL(rn) ( OP(rn)==EXACTFL || OP(rn)==REFFL || OP(rn)==NREFFL ) |
| 145 | |
| 146 | #else |
| 147 | /* ... so we use this as its faster. */ |
| 148 | #define IS_TEXT(rn) ( OP(rn)==EXACT ) |
| 149 | #define IS_TEXTF(rn) ( OP(rn)==EXACTF ) |
| 150 | #define IS_TEXTFL(rn) ( OP(rn)==EXACTFL ) |
| 151 | |
| 152 | #endif |
| 153 | |
| 154 | /* |
| 155 | Search for mandatory following text node; for lookahead, the text must |
| 156 | follow but for lookbehind (rn->flags != 0) we skip to the next step. |
| 157 | */ |
| 158 | #define FIND_NEXT_IMPT(rn) STMT_START { \ |
| 159 | while (JUMPABLE(rn)) { \ |
| 160 | const OPCODE type = OP(rn); \ |
| 161 | if (type == SUSPEND || PL_regkind[type] == CURLY) \ |
| 162 | rn = NEXTOPER(NEXTOPER(rn)); \ |
| 163 | else if (type == PLUS) \ |
| 164 | rn = NEXTOPER(rn); \ |
| 165 | else if (type == IFMATCH) \ |
| 166 | rn = (rn->flags == 0) ? NEXTOPER(NEXTOPER(rn)) : rn + ARG(rn); \ |
| 167 | else rn += NEXT_OFF(rn); \ |
| 168 | } \ |
| 169 | } STMT_END |
| 170 | |
| 171 | |
| 172 | static void restore_pos(pTHX_ void *arg); |
| 173 | |
| 174 | STATIC CHECKPOINT |
| 175 | S_regcppush(pTHX_ I32 parenfloor) |
| 176 | { |
| 177 | dVAR; |
| 178 | const int retval = PL_savestack_ix; |
| 179 | #define REGCP_PAREN_ELEMS 4 |
| 180 | const int paren_elems_to_push = (PL_regsize - parenfloor) * REGCP_PAREN_ELEMS; |
| 181 | int p; |
| 182 | GET_RE_DEBUG_FLAGS_DECL; |
| 183 | |
| 184 | if (paren_elems_to_push < 0) |
| 185 | Perl_croak(aTHX_ "panic: paren_elems_to_push < 0"); |
| 186 | |
| 187 | #define REGCP_OTHER_ELEMS 8 |
| 188 | SSGROW(paren_elems_to_push + REGCP_OTHER_ELEMS); |
| 189 | |
| 190 | for (p = PL_regsize; p > parenfloor; p--) { |
| 191 | /* REGCP_PARENS_ELEMS are pushed per pairs of parentheses. */ |
| 192 | SSPUSHINT(PL_regendp[p]); |
| 193 | SSPUSHINT(PL_regstartp[p]); |
| 194 | SSPUSHPTR(PL_reg_start_tmp[p]); |
| 195 | SSPUSHINT(p); |
| 196 | DEBUG_BUFFERS_r(PerlIO_printf(Perl_debug_log, |
| 197 | " saving \\%"UVuf" %"IVdf"(%"IVdf")..%"IVdf"\n", |
| 198 | (UV)p, (IV)PL_regstartp[p], |
| 199 | (IV)(PL_reg_start_tmp[p] - PL_bostr), |
| 200 | (IV)PL_regendp[p] |
| 201 | )); |
| 202 | } |
| 203 | /* REGCP_OTHER_ELEMS are pushed in any case, parentheses or no. */ |
| 204 | SSPUSHPTR(PL_regstartp); |
| 205 | SSPUSHPTR(PL_regendp); |
| 206 | SSPUSHINT(PL_regsize); |
| 207 | SSPUSHINT(*PL_reglastparen); |
| 208 | SSPUSHINT(*PL_reglastcloseparen); |
| 209 | SSPUSHPTR(PL_reginput); |
| 210 | #define REGCP_FRAME_ELEMS 2 |
| 211 | /* REGCP_FRAME_ELEMS are part of the REGCP_OTHER_ELEMS and |
| 212 | * are needed for the regexp context stack bookkeeping. */ |
| 213 | SSPUSHINT(paren_elems_to_push + REGCP_OTHER_ELEMS - REGCP_FRAME_ELEMS); |
| 214 | SSPUSHINT(SAVEt_REGCONTEXT); /* Magic cookie. */ |
| 215 | |
| 216 | return retval; |
| 217 | } |
| 218 | |
| 219 | /* These are needed since we do not localize EVAL nodes: */ |
| 220 | #define REGCP_SET(cp) \ |
| 221 | DEBUG_STATE_r( \ |
| 222 | PerlIO_printf(Perl_debug_log, \ |
| 223 | " Setting an EVAL scope, savestack=%"IVdf"\n", \ |
| 224 | (IV)PL_savestack_ix)); \ |
| 225 | cp = PL_savestack_ix |
| 226 | |
| 227 | #define REGCP_UNWIND(cp) \ |
| 228 | DEBUG_STATE_r( \ |
| 229 | if (cp != PL_savestack_ix) \ |
| 230 | PerlIO_printf(Perl_debug_log, \ |
| 231 | " Clearing an EVAL scope, savestack=%"IVdf"..%"IVdf"\n", \ |
| 232 | (IV)(cp), (IV)PL_savestack_ix)); \ |
| 233 | regcpblow(cp) |
| 234 | |
| 235 | STATIC char * |
| 236 | S_regcppop(pTHX_ const regexp *rex) |
| 237 | { |
| 238 | dVAR; |
| 239 | U32 i; |
| 240 | char *input; |
| 241 | |
| 242 | GET_RE_DEBUG_FLAGS_DECL; |
| 243 | |
| 244 | /* Pop REGCP_OTHER_ELEMS before the parentheses loop starts. */ |
| 245 | i = SSPOPINT; |
| 246 | assert(i == SAVEt_REGCONTEXT); /* Check that the magic cookie is there. */ |
| 247 | i = SSPOPINT; /* Parentheses elements to pop. */ |
| 248 | input = (char *) SSPOPPTR; |
| 249 | *PL_reglastcloseparen = SSPOPINT; |
| 250 | *PL_reglastparen = SSPOPINT; |
| 251 | PL_regsize = SSPOPINT; |
| 252 | PL_regendp=(I32 *) SSPOPPTR; |
| 253 | PL_regstartp=(I32 *) SSPOPPTR; |
| 254 | |
| 255 | |
| 256 | /* Now restore the parentheses context. */ |
| 257 | for (i -= (REGCP_OTHER_ELEMS - REGCP_FRAME_ELEMS); |
| 258 | i > 0; i -= REGCP_PAREN_ELEMS) { |
| 259 | I32 tmps; |
| 260 | U32 paren = (U32)SSPOPINT; |
| 261 | PL_reg_start_tmp[paren] = (char *) SSPOPPTR; |
| 262 | PL_regstartp[paren] = SSPOPINT; |
| 263 | tmps = SSPOPINT; |
| 264 | if (paren <= *PL_reglastparen) |
| 265 | PL_regendp[paren] = tmps; |
| 266 | DEBUG_BUFFERS_r( |
| 267 | PerlIO_printf(Perl_debug_log, |
| 268 | " restoring \\%"UVuf" to %"IVdf"(%"IVdf")..%"IVdf"%s\n", |
| 269 | (UV)paren, (IV)PL_regstartp[paren], |
| 270 | (IV)(PL_reg_start_tmp[paren] - PL_bostr), |
| 271 | (IV)PL_regendp[paren], |
| 272 | (paren > *PL_reglastparen ? "(no)" : "")); |
| 273 | ); |
| 274 | } |
| 275 | DEBUG_BUFFERS_r( |
| 276 | if (*PL_reglastparen + 1 <= rex->nparens) { |
| 277 | PerlIO_printf(Perl_debug_log, |
| 278 | " restoring \\%"IVdf"..\\%"IVdf" to undef\n", |
| 279 | (IV)(*PL_reglastparen + 1), (IV)rex->nparens); |
| 280 | } |
| 281 | ); |
| 282 | #if 1 |
| 283 | /* It would seem that the similar code in regtry() |
| 284 | * already takes care of this, and in fact it is in |
| 285 | * a better location to since this code can #if 0-ed out |
| 286 | * but the code in regtry() is needed or otherwise tests |
| 287 | * requiring null fields (pat.t#187 and split.t#{13,14} |
| 288 | * (as of patchlevel 7877) will fail. Then again, |
| 289 | * this code seems to be necessary or otherwise |
| 290 | * building DynaLoader will fail: |
| 291 | * "Error: '*' not in typemap in DynaLoader.xs, line 164" |
| 292 | * --jhi */ |
| 293 | for (i = *PL_reglastparen + 1; i <= rex->nparens; i++) { |
| 294 | if (i > PL_regsize) |
| 295 | PL_regstartp[i] = -1; |
| 296 | PL_regendp[i] = -1; |
| 297 | } |
| 298 | #endif |
| 299 | return input; |
| 300 | } |
| 301 | |
| 302 | #define regcpblow(cp) LEAVE_SCOPE(cp) /* Ignores regcppush()ed data. */ |
| 303 | |
| 304 | /* |
| 305 | * pregexec and friends |
| 306 | */ |
| 307 | |
| 308 | #ifndef PERL_IN_XSUB_RE |
| 309 | /* |
| 310 | - pregexec - match a regexp against a string |
| 311 | */ |
| 312 | I32 |
| 313 | Perl_pregexec(pTHX_ register regexp *prog, char *stringarg, register char *strend, |
| 314 | char *strbeg, I32 minend, SV *screamer, U32 nosave) |
| 315 | /* strend: pointer to null at end of string */ |
| 316 | /* strbeg: real beginning of string */ |
| 317 | /* minend: end of match must be >=minend after stringarg. */ |
| 318 | /* nosave: For optimizations. */ |
| 319 | { |
| 320 | return |
| 321 | regexec_flags(prog, stringarg, strend, strbeg, minend, screamer, NULL, |
| 322 | nosave ? 0 : REXEC_COPY_STR); |
| 323 | } |
| 324 | #endif |
| 325 | |
| 326 | /* |
| 327 | * Need to implement the following flags for reg_anch: |
| 328 | * |
| 329 | * USE_INTUIT_NOML - Useful to call re_intuit_start() first |
| 330 | * USE_INTUIT_ML |
| 331 | * INTUIT_AUTORITATIVE_NOML - Can trust a positive answer |
| 332 | * INTUIT_AUTORITATIVE_ML |
| 333 | * INTUIT_ONCE_NOML - Intuit can match in one location only. |
| 334 | * INTUIT_ONCE_ML |
| 335 | * |
| 336 | * Another flag for this function: SECOND_TIME (so that float substrs |
| 337 | * with giant delta may be not rechecked). |
| 338 | */ |
| 339 | |
| 340 | /* Assumptions: if ANCH_GPOS, then strpos is anchored. XXXX Check GPOS logic */ |
| 341 | |
| 342 | /* If SCREAM, then SvPVX_const(sv) should be compatible with strpos and strend. |
| 343 | Otherwise, only SvCUR(sv) is used to get strbeg. */ |
| 344 | |
| 345 | /* XXXX We assume that strpos is strbeg unless sv. */ |
| 346 | |
| 347 | /* XXXX Some places assume that there is a fixed substring. |
| 348 | An update may be needed if optimizer marks as "INTUITable" |
| 349 | RExen without fixed substrings. Similarly, it is assumed that |
| 350 | lengths of all the strings are no more than minlen, thus they |
| 351 | cannot come from lookahead. |
| 352 | (Or minlen should take into account lookahead.) |
| 353 | NOTE: Some of this comment is not correct. minlen does now take account |
| 354 | of lookahead/behind. Further research is required. -- demerphq |
| 355 | |
| 356 | */ |
| 357 | |
| 358 | /* A failure to find a constant substring means that there is no need to make |
| 359 | an expensive call to REx engine, thus we celebrate a failure. Similarly, |
| 360 | finding a substring too deep into the string means that less calls to |
| 361 | regtry() should be needed. |
| 362 | |
| 363 | REx compiler's optimizer found 4 possible hints: |
| 364 | a) Anchored substring; |
| 365 | b) Fixed substring; |
| 366 | c) Whether we are anchored (beginning-of-line or \G); |
| 367 | d) First node (of those at offset 0) which may distingush positions; |
| 368 | We use a)b)d) and multiline-part of c), and try to find a position in the |
| 369 | string which does not contradict any of them. |
| 370 | */ |
| 371 | |
| 372 | /* Most of decisions we do here should have been done at compile time. |
| 373 | The nodes of the REx which we used for the search should have been |
| 374 | deleted from the finite automaton. */ |
| 375 | |
| 376 | char * |
| 377 | Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos, |
| 378 | char *strend, U32 flags, re_scream_pos_data *data) |
| 379 | { |
| 380 | dVAR; |
| 381 | register I32 start_shift = 0; |
| 382 | /* Should be nonnegative! */ |
| 383 | register I32 end_shift = 0; |
| 384 | register char *s; |
| 385 | register SV *check; |
| 386 | char *strbeg; |
| 387 | char *t; |
| 388 | const bool do_utf8 = (sv && SvUTF8(sv)) ? 1 : 0; /* if no sv we have to assume bytes */ |
| 389 | I32 ml_anch; |
| 390 | register char *other_last = NULL; /* other substr checked before this */ |
| 391 | char *check_at = NULL; /* check substr found at this pos */ |
| 392 | const I32 multiline = prog->extflags & RXf_PMf_MULTILINE; |
| 393 | RXi_GET_DECL(prog,progi); |
| 394 | #ifdef DEBUGGING |
| 395 | const char * const i_strpos = strpos; |
| 396 | #endif |
| 397 | |
| 398 | GET_RE_DEBUG_FLAGS_DECL; |
| 399 | |
| 400 | RX_MATCH_UTF8_set(prog,do_utf8); |
| 401 | |
| 402 | if (prog->extflags & RXf_UTF8) { |
| 403 | PL_reg_flags |= RF_utf8; |
| 404 | } |
| 405 | DEBUG_EXECUTE_r( |
| 406 | debug_start_match(prog, do_utf8, strpos, strend, |
| 407 | sv ? "Guessing start of match in sv for" |
| 408 | : "Guessing start of match in string for"); |
| 409 | ); |
| 410 | |
| 411 | /* CHR_DIST() would be more correct here but it makes things slow. */ |
| 412 | if (prog->minlen > strend - strpos) { |
| 413 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 414 | "String too short... [re_intuit_start]\n")); |
| 415 | goto fail; |
| 416 | } |
| 417 | |
| 418 | strbeg = (sv && SvPOK(sv)) ? strend - SvCUR(sv) : strpos; |
| 419 | PL_regeol = strend; |
| 420 | if (do_utf8) { |
| 421 | if (!prog->check_utf8 && prog->check_substr) |
| 422 | to_utf8_substr(prog); |
| 423 | check = prog->check_utf8; |
| 424 | } else { |
| 425 | if (!prog->check_substr && prog->check_utf8) |
| 426 | to_byte_substr(prog); |
| 427 | check = prog->check_substr; |
| 428 | } |
| 429 | if (check == &PL_sv_undef) { |
| 430 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 431 | "Non-utf8 string cannot match utf8 check string\n")); |
| 432 | goto fail; |
| 433 | } |
| 434 | if (prog->extflags & RXf_ANCH) { /* Match at beg-of-str or after \n */ |
| 435 | ml_anch = !( (prog->extflags & RXf_ANCH_SINGLE) |
| 436 | || ( (prog->extflags & RXf_ANCH_BOL) |
| 437 | && !multiline ) ); /* Check after \n? */ |
| 438 | |
| 439 | if (!ml_anch) { |
| 440 | if ( !(prog->extflags & RXf_ANCH_GPOS) /* Checked by the caller */ |
| 441 | && !(prog->intflags & PREGf_IMPLICIT) /* not a real BOL */ |
| 442 | /* SvCUR is not set on references: SvRV and SvPVX_const overlap */ |
| 443 | && sv && !SvROK(sv) |
| 444 | && (strpos != strbeg)) { |
| 445 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Not at start...\n")); |
| 446 | goto fail; |
| 447 | } |
| 448 | if (prog->check_offset_min == prog->check_offset_max && |
| 449 | !(prog->extflags & RXf_CANY_SEEN)) { |
| 450 | /* Substring at constant offset from beg-of-str... */ |
| 451 | I32 slen; |
| 452 | |
| 453 | s = HOP3c(strpos, prog->check_offset_min, strend); |
| 454 | |
| 455 | if (SvTAIL(check)) { |
| 456 | slen = SvCUR(check); /* >= 1 */ |
| 457 | |
| 458 | if ( strend - s > slen || strend - s < slen - 1 |
| 459 | || (strend - s == slen && strend[-1] != '\n')) { |
| 460 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "String too long...\n")); |
| 461 | goto fail_finish; |
| 462 | } |
| 463 | /* Now should match s[0..slen-2] */ |
| 464 | slen--; |
| 465 | if (slen && (*SvPVX_const(check) != *s |
| 466 | || (slen > 1 |
| 467 | && memNE(SvPVX_const(check), s, slen)))) { |
| 468 | report_neq: |
| 469 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "String not equal...\n")); |
| 470 | goto fail_finish; |
| 471 | } |
| 472 | } |
| 473 | else if (*SvPVX_const(check) != *s |
| 474 | || ((slen = SvCUR(check)) > 1 |
| 475 | && memNE(SvPVX_const(check), s, slen))) |
| 476 | goto report_neq; |
| 477 | check_at = s; |
| 478 | goto success_at_start; |
| 479 | } |
| 480 | } |
| 481 | /* Match is anchored, but substr is not anchored wrt beg-of-str. */ |
| 482 | s = strpos; |
| 483 | start_shift = prog->check_offset_min; /* okay to underestimate on CC */ |
| 484 | end_shift = prog->check_end_shift; |
| 485 | |
| 486 | if (!ml_anch) { |
| 487 | const I32 end = prog->check_offset_max + CHR_SVLEN(check) |
| 488 | - (SvTAIL(check) != 0); |
| 489 | const I32 eshift = CHR_DIST((U8*)strend, (U8*)s) - end; |
| 490 | |
| 491 | if (end_shift < eshift) |
| 492 | end_shift = eshift; |
| 493 | } |
| 494 | } |
| 495 | else { /* Can match at random position */ |
| 496 | ml_anch = 0; |
| 497 | s = strpos; |
| 498 | start_shift = prog->check_offset_min; /* okay to underestimate on CC */ |
| 499 | end_shift = prog->check_end_shift; |
| 500 | |
| 501 | /* end shift should be non negative here */ |
| 502 | } |
| 503 | |
| 504 | #ifdef QDEBUGGING /* 7/99: reports of failure (with the older version) */ |
| 505 | if (end_shift < 0) |
| 506 | Perl_croak(aTHX_ "panic: end_shift: %"IVdf" pattern:\n%s\n ", |
| 507 | (IV)end_shift, prog->precomp); |
| 508 | #endif |
| 509 | |
| 510 | restart: |
| 511 | /* Find a possible match in the region s..strend by looking for |
| 512 | the "check" substring in the region corrected by start/end_shift. */ |
| 513 | |
| 514 | { |
| 515 | I32 srch_start_shift = start_shift; |
| 516 | I32 srch_end_shift = end_shift; |
| 517 | if (srch_start_shift < 0 && strbeg - s > srch_start_shift) { |
| 518 | srch_end_shift -= ((strbeg - s) - srch_start_shift); |
| 519 | srch_start_shift = strbeg - s; |
| 520 | } |
| 521 | DEBUG_OPTIMISE_MORE_r({ |
| 522 | PerlIO_printf(Perl_debug_log, "Check offset min: %"IVdf" Start shift: %"IVdf" End shift %"IVdf" Real End Shift: %"IVdf"\n", |
| 523 | (IV)prog->check_offset_min, |
| 524 | (IV)srch_start_shift, |
| 525 | (IV)srch_end_shift, |
| 526 | (IV)prog->check_end_shift); |
| 527 | }); |
| 528 | |
| 529 | if (flags & REXEC_SCREAM) { |
| 530 | I32 p = -1; /* Internal iterator of scream. */ |
| 531 | I32 * const pp = data ? data->scream_pos : &p; |
| 532 | |
| 533 | if (PL_screamfirst[BmRARE(check)] >= 0 |
| 534 | || ( BmRARE(check) == '\n' |
| 535 | && (BmPREVIOUS(check) == SvCUR(check) - 1) |
| 536 | && SvTAIL(check) )) |
| 537 | s = screaminstr(sv, check, |
| 538 | srch_start_shift + (s - strbeg), srch_end_shift, pp, 0); |
| 539 | else |
| 540 | goto fail_finish; |
| 541 | /* we may be pointing at the wrong string */ |
| 542 | if (s && RX_MATCH_COPIED(prog)) |
| 543 | s = strbeg + (s - SvPVX_const(sv)); |
| 544 | if (data) |
| 545 | *data->scream_olds = s; |
| 546 | } |
| 547 | else { |
| 548 | U8* start_point; |
| 549 | U8* end_point; |
| 550 | if (prog->extflags & RXf_CANY_SEEN) { |
| 551 | start_point= (U8*)(s + srch_start_shift); |
| 552 | end_point= (U8*)(strend - srch_end_shift); |
| 553 | } else { |
| 554 | start_point= HOP3(s, srch_start_shift, srch_start_shift < 0 ? strbeg : strend); |
| 555 | end_point= HOP3(strend, -srch_end_shift, strbeg); |
| 556 | } |
| 557 | DEBUG_OPTIMISE_MORE_r({ |
| 558 | PerlIO_printf(Perl_debug_log, "fbm_instr len=%d str=<%.*s>\n", |
| 559 | (int)(end_point - start_point), |
| 560 | (int)(end_point - start_point) > 20 ? 20 : (int)(end_point - start_point), |
| 561 | start_point); |
| 562 | }); |
| 563 | |
| 564 | s = fbm_instr( start_point, end_point, |
| 565 | check, multiline ? FBMrf_MULTILINE : 0); |
| 566 | } |
| 567 | } |
| 568 | /* Update the count-of-usability, remove useless subpatterns, |
| 569 | unshift s. */ |
| 570 | |
| 571 | DEBUG_EXECUTE_r({ |
| 572 | RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), |
| 573 | SvPVX_const(check), RE_SV_DUMPLEN(check), 30); |
| 574 | PerlIO_printf(Perl_debug_log, "%s %s substr %s%s%s", |
| 575 | (s ? "Found" : "Did not find"), |
| 576 | (check == (do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) |
| 577 | ? "anchored" : "floating"), |
| 578 | quoted, |
| 579 | RE_SV_TAIL(check), |
| 580 | (s ? " at offset " : "...\n") ); |
| 581 | }); |
| 582 | |
| 583 | if (!s) |
| 584 | goto fail_finish; |
| 585 | /* Finish the diagnostic message */ |
| 586 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%ld...\n", (long)(s - i_strpos)) ); |
| 587 | |
| 588 | /* XXX dmq: first branch is for positive lookbehind... |
| 589 | Our check string is offset from the beginning of the pattern. |
| 590 | So we need to do any stclass tests offset forward from that |
| 591 | point. I think. :-( |
| 592 | */ |
| 593 | |
| 594 | |
| 595 | |
| 596 | check_at=s; |
| 597 | |
| 598 | |
| 599 | /* Got a candidate. Check MBOL anchoring, and the *other* substr. |
| 600 | Start with the other substr. |
| 601 | XXXX no SCREAM optimization yet - and a very coarse implementation |
| 602 | XXXX /ttx+/ results in anchored="ttx", floating="x". floating will |
| 603 | *always* match. Probably should be marked during compile... |
| 604 | Probably it is right to do no SCREAM here... |
| 605 | */ |
| 606 | |
| 607 | if (do_utf8 ? (prog->float_utf8 && prog->anchored_utf8) |
| 608 | : (prog->float_substr && prog->anchored_substr)) |
| 609 | { |
| 610 | /* Take into account the "other" substring. */ |
| 611 | /* XXXX May be hopelessly wrong for UTF... */ |
| 612 | if (!other_last) |
| 613 | other_last = strpos; |
| 614 | if (check == (do_utf8 ? prog->float_utf8 : prog->float_substr)) { |
| 615 | do_other_anchored: |
| 616 | { |
| 617 | char * const last = HOP3c(s, -start_shift, strbeg); |
| 618 | char *last1, *last2; |
| 619 | char * const saved_s = s; |
| 620 | SV* must; |
| 621 | |
| 622 | t = s - prog->check_offset_max; |
| 623 | if (s - strpos > prog->check_offset_max /* signed-corrected t > strpos */ |
| 624 | && (!do_utf8 |
| 625 | || ((t = (char*)reghopmaybe3((U8*)s, -(prog->check_offset_max), (U8*)strpos)) |
| 626 | && t > strpos))) |
| 627 | NOOP; |
| 628 | else |
| 629 | t = strpos; |
| 630 | t = HOP3c(t, prog->anchored_offset, strend); |
| 631 | if (t < other_last) /* These positions already checked */ |
| 632 | t = other_last; |
| 633 | last2 = last1 = HOP3c(strend, -prog->minlen, strbeg); |
| 634 | if (last < last1) |
| 635 | last1 = last; |
| 636 | /* XXXX It is not documented what units *_offsets are in. |
| 637 | We assume bytes, but this is clearly wrong. |
| 638 | Meaning this code needs to be carefully reviewed for errors. |
| 639 | dmq. |
| 640 | */ |
| 641 | |
| 642 | /* On end-of-str: see comment below. */ |
| 643 | must = do_utf8 ? prog->anchored_utf8 : prog->anchored_substr; |
| 644 | if (must == &PL_sv_undef) { |
| 645 | s = (char*)NULL; |
| 646 | DEBUG_r(must = prog->anchored_utf8); /* for debug */ |
| 647 | } |
| 648 | else |
| 649 | s = fbm_instr( |
| 650 | (unsigned char*)t, |
| 651 | HOP3(HOP3(last1, prog->anchored_offset, strend) |
| 652 | + SvCUR(must), -(SvTAIL(must)!=0), strbeg), |
| 653 | must, |
| 654 | multiline ? FBMrf_MULTILINE : 0 |
| 655 | ); |
| 656 | DEBUG_EXECUTE_r({ |
| 657 | RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), |
| 658 | SvPVX_const(must), RE_SV_DUMPLEN(must), 30); |
| 659 | PerlIO_printf(Perl_debug_log, "%s anchored substr %s%s", |
| 660 | (s ? "Found" : "Contradicts"), |
| 661 | quoted, RE_SV_TAIL(must)); |
| 662 | }); |
| 663 | |
| 664 | |
| 665 | if (!s) { |
| 666 | if (last1 >= last2) { |
| 667 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 668 | ", giving up...\n")); |
| 669 | goto fail_finish; |
| 670 | } |
| 671 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 672 | ", trying floating at offset %ld...\n", |
| 673 | (long)(HOP3c(saved_s, 1, strend) - i_strpos))); |
| 674 | other_last = HOP3c(last1, prog->anchored_offset+1, strend); |
| 675 | s = HOP3c(last, 1, strend); |
| 676 | goto restart; |
| 677 | } |
| 678 | else { |
| 679 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, " at offset %ld...\n", |
| 680 | (long)(s - i_strpos))); |
| 681 | t = HOP3c(s, -prog->anchored_offset, strbeg); |
| 682 | other_last = HOP3c(s, 1, strend); |
| 683 | s = saved_s; |
| 684 | if (t == strpos) |
| 685 | goto try_at_start; |
| 686 | goto try_at_offset; |
| 687 | } |
| 688 | } |
| 689 | } |
| 690 | else { /* Take into account the floating substring. */ |
| 691 | char *last, *last1; |
| 692 | char * const saved_s = s; |
| 693 | SV* must; |
| 694 | |
| 695 | t = HOP3c(s, -start_shift, strbeg); |
| 696 | last1 = last = |
| 697 | HOP3c(strend, -prog->minlen + prog->float_min_offset, strbeg); |
| 698 | if (CHR_DIST((U8*)last, (U8*)t) > prog->float_max_offset) |
| 699 | last = HOP3c(t, prog->float_max_offset, strend); |
| 700 | s = HOP3c(t, prog->float_min_offset, strend); |
| 701 | if (s < other_last) |
| 702 | s = other_last; |
| 703 | /* XXXX It is not documented what units *_offsets are in. Assume bytes. */ |
| 704 | must = do_utf8 ? prog->float_utf8 : prog->float_substr; |
| 705 | /* fbm_instr() takes into account exact value of end-of-str |
| 706 | if the check is SvTAIL(ed). Since false positives are OK, |
| 707 | and end-of-str is not later than strend we are OK. */ |
| 708 | if (must == &PL_sv_undef) { |
| 709 | s = (char*)NULL; |
| 710 | DEBUG_r(must = prog->float_utf8); /* for debug message */ |
| 711 | } |
| 712 | else |
| 713 | s = fbm_instr((unsigned char*)s, |
| 714 | (unsigned char*)last + SvCUR(must) |
| 715 | - (SvTAIL(must)!=0), |
| 716 | must, multiline ? FBMrf_MULTILINE : 0); |
| 717 | DEBUG_EXECUTE_r({ |
| 718 | RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), |
| 719 | SvPVX_const(must), RE_SV_DUMPLEN(must), 30); |
| 720 | PerlIO_printf(Perl_debug_log, "%s floating substr %s%s", |
| 721 | (s ? "Found" : "Contradicts"), |
| 722 | quoted, RE_SV_TAIL(must)); |
| 723 | }); |
| 724 | if (!s) { |
| 725 | if (last1 == last) { |
| 726 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 727 | ", giving up...\n")); |
| 728 | goto fail_finish; |
| 729 | } |
| 730 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 731 | ", trying anchored starting at offset %ld...\n", |
| 732 | (long)(saved_s + 1 - i_strpos))); |
| 733 | other_last = last; |
| 734 | s = HOP3c(t, 1, strend); |
| 735 | goto restart; |
| 736 | } |
| 737 | else { |
| 738 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, " at offset %ld...\n", |
| 739 | (long)(s - i_strpos))); |
| 740 | other_last = s; /* Fix this later. --Hugo */ |
| 741 | s = saved_s; |
| 742 | if (t == strpos) |
| 743 | goto try_at_start; |
| 744 | goto try_at_offset; |
| 745 | } |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | |
| 750 | t= (char*)HOP3( s, -prog->check_offset_max, (prog->check_offset_max<0) ? strend : strpos); |
| 751 | |
| 752 | DEBUG_OPTIMISE_MORE_r( |
| 753 | PerlIO_printf(Perl_debug_log, |
| 754 | "Check offset min:%"IVdf" max:%"IVdf" S:%"IVdf" t:%"IVdf" D:%"IVdf" end:%"IVdf"\n", |
| 755 | (IV)prog->check_offset_min, |
| 756 | (IV)prog->check_offset_max, |
| 757 | (IV)(s-strpos), |
| 758 | (IV)(t-strpos), |
| 759 | (IV)(t-s), |
| 760 | (IV)(strend-strpos) |
| 761 | ) |
| 762 | ); |
| 763 | |
| 764 | if (s - strpos > prog->check_offset_max /* signed-corrected t > strpos */ |
| 765 | && (!do_utf8 |
| 766 | || ((t = (char*)reghopmaybe3((U8*)s, -prog->check_offset_max, (U8*) ((prog->check_offset_max<0) ? strend : strpos))) |
| 767 | && t > strpos))) |
| 768 | { |
| 769 | /* Fixed substring is found far enough so that the match |
| 770 | cannot start at strpos. */ |
| 771 | try_at_offset: |
| 772 | if (ml_anch && t[-1] != '\n') { |
| 773 | /* Eventually fbm_*() should handle this, but often |
| 774 | anchored_offset is not 0, so this check will not be wasted. */ |
| 775 | /* XXXX In the code below we prefer to look for "^" even in |
| 776 | presence of anchored substrings. And we search even |
| 777 | beyond the found float position. These pessimizations |
| 778 | are historical artefacts only. */ |
| 779 | find_anchor: |
| 780 | while (t < strend - prog->minlen) { |
| 781 | if (*t == '\n') { |
| 782 | if (t < check_at - prog->check_offset_min) { |
| 783 | if (do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) { |
| 784 | /* Since we moved from the found position, |
| 785 | we definitely contradict the found anchored |
| 786 | substr. Due to the above check we do not |
| 787 | contradict "check" substr. |
| 788 | Thus we can arrive here only if check substr |
| 789 | is float. Redo checking for "other"=="fixed". |
| 790 | */ |
| 791 | strpos = t + 1; |
| 792 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m at offset %ld, rescanning for anchored from offset %ld...\n", |
| 793 | PL_colors[0], PL_colors[1], (long)(strpos - i_strpos), (long)(strpos - i_strpos + prog->anchored_offset))); |
| 794 | goto do_other_anchored; |
| 795 | } |
| 796 | /* We don't contradict the found floating substring. */ |
| 797 | /* XXXX Why not check for STCLASS? */ |
| 798 | s = t + 1; |
| 799 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m at offset %ld...\n", |
| 800 | PL_colors[0], PL_colors[1], (long)(s - i_strpos))); |
| 801 | goto set_useful; |
| 802 | } |
| 803 | /* Position contradicts check-string */ |
| 804 | /* XXXX probably better to look for check-string |
| 805 | than for "\n", so one should lower the limit for t? */ |
| 806 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m, restarting lookup for check-string at offset %ld...\n", |
| 807 | PL_colors[0], PL_colors[1], (long)(t + 1 - i_strpos))); |
| 808 | other_last = strpos = s = t + 1; |
| 809 | goto restart; |
| 810 | } |
| 811 | t++; |
| 812 | } |
| 813 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Did not find /%s^%s/m...\n", |
| 814 | PL_colors[0], PL_colors[1])); |
| 815 | goto fail_finish; |
| 816 | } |
| 817 | else { |
| 818 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Starting position does not contradict /%s^%s/m...\n", |
| 819 | PL_colors[0], PL_colors[1])); |
| 820 | } |
| 821 | s = t; |
| 822 | set_useful: |
| 823 | ++BmUSEFUL(do_utf8 ? prog->check_utf8 : prog->check_substr); /* hooray/5 */ |
| 824 | } |
| 825 | else { |
| 826 | /* The found string does not prohibit matching at strpos, |
| 827 | - no optimization of calling REx engine can be performed, |
| 828 | unless it was an MBOL and we are not after MBOL, |
| 829 | or a future STCLASS check will fail this. */ |
| 830 | try_at_start: |
| 831 | /* Even in this situation we may use MBOL flag if strpos is offset |
| 832 | wrt the start of the string. */ |
| 833 | if (ml_anch && sv && !SvROK(sv) /* See prev comment on SvROK */ |
| 834 | && (strpos != strbeg) && strpos[-1] != '\n' |
| 835 | /* May be due to an implicit anchor of m{.*foo} */ |
| 836 | && !(prog->intflags & PREGf_IMPLICIT)) |
| 837 | { |
| 838 | t = strpos; |
| 839 | goto find_anchor; |
| 840 | } |
| 841 | DEBUG_EXECUTE_r( if (ml_anch) |
| 842 | PerlIO_printf(Perl_debug_log, "Position at offset %ld does not contradict /%s^%s/m...\n", |
| 843 | (long)(strpos - i_strpos), PL_colors[0], PL_colors[1]); |
| 844 | ); |
| 845 | success_at_start: |
| 846 | if (!(prog->intflags & PREGf_NAUGHTY) /* XXXX If strpos moved? */ |
| 847 | && (do_utf8 ? ( |
| 848 | prog->check_utf8 /* Could be deleted already */ |
| 849 | && --BmUSEFUL(prog->check_utf8) < 0 |
| 850 | && (prog->check_utf8 == prog->float_utf8) |
| 851 | ) : ( |
| 852 | prog->check_substr /* Could be deleted already */ |
| 853 | && --BmUSEFUL(prog->check_substr) < 0 |
| 854 | && (prog->check_substr == prog->float_substr) |
| 855 | ))) |
| 856 | { |
| 857 | /* If flags & SOMETHING - do not do it many times on the same match */ |
| 858 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "... Disabling check substring...\n")); |
| 859 | SvREFCNT_dec(do_utf8 ? prog->check_utf8 : prog->check_substr); |
| 860 | if (do_utf8 ? prog->check_substr : prog->check_utf8) |
| 861 | SvREFCNT_dec(do_utf8 ? prog->check_substr : prog->check_utf8); |
| 862 | prog->check_substr = prog->check_utf8 = NULL; /* disable */ |
| 863 | prog->float_substr = prog->float_utf8 = NULL; /* clear */ |
| 864 | check = NULL; /* abort */ |
| 865 | s = strpos; |
| 866 | /* XXXX This is a remnant of the old implementation. It |
| 867 | looks wasteful, since now INTUIT can use many |
| 868 | other heuristics. */ |
| 869 | prog->extflags &= ~RXf_USE_INTUIT; |
| 870 | } |
| 871 | else |
| 872 | s = strpos; |
| 873 | } |
| 874 | |
| 875 | /* Last resort... */ |
| 876 | /* XXXX BmUSEFUL already changed, maybe multiple change is meaningful... */ |
| 877 | /* trie stclasses are too expensive to use here, we are better off to |
| 878 | leave it to regmatch itself */ |
| 879 | if (progi->regstclass && PL_regkind[OP(progi->regstclass)]!=TRIE) { |
| 880 | /* minlen == 0 is possible if regstclass is \b or \B, |
| 881 | and the fixed substr is ''$. |
| 882 | Since minlen is already taken into account, s+1 is before strend; |
| 883 | accidentally, minlen >= 1 guaranties no false positives at s + 1 |
| 884 | even for \b or \B. But (minlen? 1 : 0) below assumes that |
| 885 | regstclass does not come from lookahead... */ |
| 886 | /* If regstclass takes bytelength more than 1: If charlength==1, OK. |
| 887 | This leaves EXACTF only, which is dealt with in find_byclass(). */ |
| 888 | const U8* const str = (U8*)STRING(progi->regstclass); |
| 889 | const int cl_l = (PL_regkind[OP(progi->regstclass)] == EXACT |
| 890 | ? CHR_DIST(str+STR_LEN(progi->regstclass), str) |
| 891 | : 1); |
| 892 | char * endpos; |
| 893 | if (prog->anchored_substr || prog->anchored_utf8 || ml_anch) |
| 894 | endpos= HOP3c(s, (prog->minlen ? cl_l : 0), strend); |
| 895 | else if (prog->float_substr || prog->float_utf8) |
| 896 | endpos= HOP3c(HOP3c(check_at, -start_shift, strbeg), cl_l, strend); |
| 897 | else |
| 898 | endpos= strend; |
| 899 | |
| 900 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "start_shift: %"IVdf" check_at: %"IVdf" s: %"IVdf" endpos: %"IVdf"\n", |
| 901 | (IV)start_shift, (IV)(check_at - strbeg), (IV)(s - strbeg), (IV)(endpos - strbeg))); |
| 902 | |
| 903 | t = s; |
| 904 | s = find_byclass(prog, progi->regstclass, s, endpos, NULL); |
| 905 | if (!s) { |
| 906 | #ifdef DEBUGGING |
| 907 | const char *what = NULL; |
| 908 | #endif |
| 909 | if (endpos == strend) { |
| 910 | DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, |
| 911 | "Could not match STCLASS...\n") ); |
| 912 | goto fail; |
| 913 | } |
| 914 | DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, |
| 915 | "This position contradicts STCLASS...\n") ); |
| 916 | if ((prog->extflags & RXf_ANCH) && !ml_anch) |
| 917 | goto fail; |
| 918 | /* Contradict one of substrings */ |
| 919 | if (prog->anchored_substr || prog->anchored_utf8) { |
| 920 | if ((do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) == check) { |
| 921 | DEBUG_EXECUTE_r( what = "anchored" ); |
| 922 | hop_and_restart: |
| 923 | s = HOP3c(t, 1, strend); |
| 924 | if (s + start_shift + end_shift > strend) { |
| 925 | /* XXXX Should be taken into account earlier? */ |
| 926 | DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, |
| 927 | "Could not match STCLASS...\n") ); |
| 928 | goto fail; |
| 929 | } |
| 930 | if (!check) |
| 931 | goto giveup; |
| 932 | DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, |
| 933 | "Looking for %s substr starting at offset %ld...\n", |
| 934 | what, (long)(s + start_shift - i_strpos)) ); |
| 935 | goto restart; |
| 936 | } |
| 937 | /* Have both, check_string is floating */ |
| 938 | if (t + start_shift >= check_at) /* Contradicts floating=check */ |
| 939 | goto retry_floating_check; |
| 940 | /* Recheck anchored substring, but not floating... */ |
| 941 | s = check_at; |
| 942 | if (!check) |
| 943 | goto giveup; |
| 944 | DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, |
| 945 | "Looking for anchored substr starting at offset %ld...\n", |
| 946 | (long)(other_last - i_strpos)) ); |
| 947 | goto do_other_anchored; |
| 948 | } |
| 949 | /* Another way we could have checked stclass at the |
| 950 | current position only: */ |
| 951 | if (ml_anch) { |
| 952 | s = t = t + 1; |
| 953 | if (!check) |
| 954 | goto giveup; |
| 955 | DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, |
| 956 | "Looking for /%s^%s/m starting at offset %ld...\n", |
| 957 | PL_colors[0], PL_colors[1], (long)(t - i_strpos)) ); |
| 958 | goto try_at_offset; |
| 959 | } |
| 960 | if (!(do_utf8 ? prog->float_utf8 : prog->float_substr)) /* Could have been deleted */ |
| 961 | goto fail; |
| 962 | /* Check is floating subtring. */ |
| 963 | retry_floating_check: |
| 964 | t = check_at - start_shift; |
| 965 | DEBUG_EXECUTE_r( what = "floating" ); |
| 966 | goto hop_and_restart; |
| 967 | } |
| 968 | if (t != s) { |
| 969 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 970 | "By STCLASS: moving %ld --> %ld\n", |
| 971 | (long)(t - i_strpos), (long)(s - i_strpos)) |
| 972 | ); |
| 973 | } |
| 974 | else { |
| 975 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 976 | "Does not contradict STCLASS...\n"); |
| 977 | ); |
| 978 | } |
| 979 | } |
| 980 | giveup: |
| 981 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%s%s:%s match at offset %ld\n", |
| 982 | PL_colors[4], (check ? "Guessed" : "Giving up"), |
| 983 | PL_colors[5], (long)(s - i_strpos)) ); |
| 984 | return s; |
| 985 | |
| 986 | fail_finish: /* Substring not found */ |
| 987 | if (prog->check_substr || prog->check_utf8) /* could be removed already */ |
| 988 | BmUSEFUL(do_utf8 ? prog->check_utf8 : prog->check_substr) += 5; /* hooray */ |
| 989 | fail: |
| 990 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch rejected by optimizer%s\n", |
| 991 | PL_colors[4], PL_colors[5])); |
| 992 | return NULL; |
| 993 | } |
| 994 | |
| 995 | |
| 996 | |
| 997 | #define REXEC_TRIE_READ_CHAR(trie_type, trie, widecharmap, uc, uscan, len, \ |
| 998 | uvc, charid, foldlen, foldbuf, uniflags) STMT_START { \ |
| 999 | switch (trie_type) { \ |
| 1000 | case trie_utf8_fold: \ |
| 1001 | if ( foldlen>0 ) { \ |
| 1002 | uvc = utf8n_to_uvuni( uscan, UTF8_MAXLEN, &len, uniflags ); \ |
| 1003 | foldlen -= len; \ |
| 1004 | uscan += len; \ |
| 1005 | len=0; \ |
| 1006 | } else { \ |
| 1007 | uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags ); \ |
| 1008 | uvc = to_uni_fold( uvc, foldbuf, &foldlen ); \ |
| 1009 | foldlen -= UNISKIP( uvc ); \ |
| 1010 | uscan = foldbuf + UNISKIP( uvc ); \ |
| 1011 | } \ |
| 1012 | break; \ |
| 1013 | case trie_utf8: \ |
| 1014 | uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags ); \ |
| 1015 | break; \ |
| 1016 | case trie_plain: \ |
| 1017 | uvc = (UV)*uc; \ |
| 1018 | len = 1; \ |
| 1019 | } \ |
| 1020 | \ |
| 1021 | if (uvc < 256) { \ |
| 1022 | charid = trie->charmap[ uvc ]; \ |
| 1023 | } \ |
| 1024 | else { \ |
| 1025 | charid = 0; \ |
| 1026 | if (widecharmap) { \ |
| 1027 | SV** const svpp = hv_fetch(widecharmap, \ |
| 1028 | (char*)&uvc, sizeof(UV), 0); \ |
| 1029 | if (svpp) \ |
| 1030 | charid = (U16)SvIV(*svpp); \ |
| 1031 | } \ |
| 1032 | } \ |
| 1033 | } STMT_END |
| 1034 | |
| 1035 | #define REXEC_FBC_EXACTISH_CHECK(CoNd) \ |
| 1036 | if ( (CoNd) \ |
| 1037 | && (ln == len || \ |
| 1038 | ibcmp_utf8(s, NULL, 0, do_utf8, \ |
| 1039 | m, NULL, ln, (bool)UTF)) \ |
| 1040 | && (!reginfo || regtry(reginfo, &s)) ) \ |
| 1041 | goto got_it; \ |
| 1042 | else { \ |
| 1043 | U8 foldbuf[UTF8_MAXBYTES_CASE+1]; \ |
| 1044 | uvchr_to_utf8(tmpbuf, c); \ |
| 1045 | f = to_utf8_fold(tmpbuf, foldbuf, &foldlen); \ |
| 1046 | if ( f != c \ |
| 1047 | && (f == c1 || f == c2) \ |
| 1048 | && (ln == foldlen || \ |
| 1049 | !ibcmp_utf8((char *) foldbuf, \ |
| 1050 | NULL, foldlen, do_utf8, \ |
| 1051 | m, \ |
| 1052 | NULL, ln, (bool)UTF)) \ |
| 1053 | && (!reginfo || regtry(reginfo, &s)) ) \ |
| 1054 | goto got_it; \ |
| 1055 | } \ |
| 1056 | s += len |
| 1057 | |
| 1058 | #define REXEC_FBC_EXACTISH_SCAN(CoNd) \ |
| 1059 | STMT_START { \ |
| 1060 | while (s <= e) { \ |
| 1061 | if ( (CoNd) \ |
| 1062 | && (ln == 1 || !(OP(c) == EXACTF \ |
| 1063 | ? ibcmp(s, m, ln) \ |
| 1064 | : ibcmp_locale(s, m, ln))) \ |
| 1065 | && (!reginfo || regtry(reginfo, &s)) ) \ |
| 1066 | goto got_it; \ |
| 1067 | s++; \ |
| 1068 | } \ |
| 1069 | } STMT_END |
| 1070 | |
| 1071 | #define REXEC_FBC_UTF8_SCAN(CoDe) \ |
| 1072 | STMT_START { \ |
| 1073 | while (s + (uskip = UTF8SKIP(s)) <= strend) { \ |
| 1074 | CoDe \ |
| 1075 | s += uskip; \ |
| 1076 | } \ |
| 1077 | } STMT_END |
| 1078 | |
| 1079 | #define REXEC_FBC_SCAN(CoDe) \ |
| 1080 | STMT_START { \ |
| 1081 | while (s < strend) { \ |
| 1082 | CoDe \ |
| 1083 | s++; \ |
| 1084 | } \ |
| 1085 | } STMT_END |
| 1086 | |
| 1087 | #define REXEC_FBC_UTF8_CLASS_SCAN(CoNd) \ |
| 1088 | REXEC_FBC_UTF8_SCAN( \ |
| 1089 | if (CoNd) { \ |
| 1090 | if (tmp && (!reginfo || regtry(reginfo, &s))) \ |
| 1091 | goto got_it; \ |
| 1092 | else \ |
| 1093 | tmp = doevery; \ |
| 1094 | } \ |
| 1095 | else \ |
| 1096 | tmp = 1; \ |
| 1097 | ) |
| 1098 | |
| 1099 | #define REXEC_FBC_CLASS_SCAN(CoNd) \ |
| 1100 | REXEC_FBC_SCAN( \ |
| 1101 | if (CoNd) { \ |
| 1102 | if (tmp && (!reginfo || regtry(reginfo, &s))) \ |
| 1103 | goto got_it; \ |
| 1104 | else \ |
| 1105 | tmp = doevery; \ |
| 1106 | } \ |
| 1107 | else \ |
| 1108 | tmp = 1; \ |
| 1109 | ) |
| 1110 | |
| 1111 | #define REXEC_FBC_TRYIT \ |
| 1112 | if ((!reginfo || regtry(reginfo, &s))) \ |
| 1113 | goto got_it |
| 1114 | |
| 1115 | #define REXEC_FBC_CSCAN_PRELOAD(UtFpReLoAd,CoNdUtF8,CoNd) \ |
| 1116 | if (do_utf8) { \ |
| 1117 | UtFpReLoAd; \ |
| 1118 | REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8); \ |
| 1119 | } \ |
| 1120 | else { \ |
| 1121 | REXEC_FBC_CLASS_SCAN(CoNd); \ |
| 1122 | } \ |
| 1123 | break |
| 1124 | |
| 1125 | #define REXEC_FBC_CSCAN_TAINT(CoNdUtF8,CoNd) \ |
| 1126 | PL_reg_flags |= RF_tainted; \ |
| 1127 | if (do_utf8) { \ |
| 1128 | REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8); \ |
| 1129 | } \ |
| 1130 | else { \ |
| 1131 | REXEC_FBC_CLASS_SCAN(CoNd); \ |
| 1132 | } \ |
| 1133 | break |
| 1134 | |
| 1135 | #define DUMP_EXEC_POS(li,s,doutf8) \ |
| 1136 | dump_exec_pos(li,s,(PL_regeol),(PL_bostr),(PL_reg_starttry),doutf8) |
| 1137 | |
| 1138 | /* We know what class REx starts with. Try to find this position... */ |
| 1139 | /* if reginfo is NULL, its a dryrun */ |
| 1140 | /* annoyingly all the vars in this routine have different names from their counterparts |
| 1141 | in regmatch. /grrr */ |
| 1142 | |
| 1143 | STATIC char * |
| 1144 | S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s, |
| 1145 | const char *strend, regmatch_info *reginfo) |
| 1146 | { |
| 1147 | dVAR; |
| 1148 | const I32 doevery = (prog->intflags & PREGf_SKIP) == 0; |
| 1149 | char *m; |
| 1150 | STRLEN ln; |
| 1151 | STRLEN lnc; |
| 1152 | register STRLEN uskip; |
| 1153 | unsigned int c1; |
| 1154 | unsigned int c2; |
| 1155 | char *e; |
| 1156 | register I32 tmp = 1; /* Scratch variable? */ |
| 1157 | register const bool do_utf8 = PL_reg_match_utf8; |
| 1158 | RXi_GET_DECL(prog,progi); |
| 1159 | |
| 1160 | /* We know what class it must start with. */ |
| 1161 | switch (OP(c)) { |
| 1162 | case ANYOF: |
| 1163 | if (do_utf8) { |
| 1164 | REXEC_FBC_UTF8_CLASS_SCAN((ANYOF_FLAGS(c) & ANYOF_UNICODE) || |
| 1165 | !UTF8_IS_INVARIANT((U8)s[0]) ? |
| 1166 | reginclass(prog, c, (U8*)s, 0, do_utf8) : |
| 1167 | REGINCLASS(prog, c, (U8*)s)); |
| 1168 | } |
| 1169 | else { |
| 1170 | while (s < strend) { |
| 1171 | STRLEN skip = 1; |
| 1172 | |
| 1173 | if (REGINCLASS(prog, c, (U8*)s) || |
| 1174 | (ANYOF_FOLD_SHARP_S(c, s, strend) && |
| 1175 | /* The assignment of 2 is intentional: |
| 1176 | * for the folded sharp s, the skip is 2. */ |
| 1177 | (skip = SHARP_S_SKIP))) { |
| 1178 | if (tmp && (!reginfo || regtry(reginfo, &s))) |
| 1179 | goto got_it; |
| 1180 | else |
| 1181 | tmp = doevery; |
| 1182 | } |
| 1183 | else |
| 1184 | tmp = 1; |
| 1185 | s += skip; |
| 1186 | } |
| 1187 | } |
| 1188 | break; |
| 1189 | case CANY: |
| 1190 | REXEC_FBC_SCAN( |
| 1191 | if (tmp && (!reginfo || regtry(reginfo, &s))) |
| 1192 | goto got_it; |
| 1193 | else |
| 1194 | tmp = doevery; |
| 1195 | ); |
| 1196 | break; |
| 1197 | case EXACTF: |
| 1198 | m = STRING(c); |
| 1199 | ln = STR_LEN(c); /* length to match in octets/bytes */ |
| 1200 | lnc = (I32) ln; /* length to match in characters */ |
| 1201 | if (UTF) { |
| 1202 | STRLEN ulen1, ulen2; |
| 1203 | U8 *sm = (U8 *) m; |
| 1204 | U8 tmpbuf1[UTF8_MAXBYTES_CASE+1]; |
| 1205 | U8 tmpbuf2[UTF8_MAXBYTES_CASE+1]; |
| 1206 | const U32 uniflags = UTF8_ALLOW_DEFAULT; |
| 1207 | |
| 1208 | to_utf8_lower((U8*)m, tmpbuf1, &ulen1); |
| 1209 | to_utf8_upper((U8*)m, tmpbuf2, &ulen2); |
| 1210 | |
| 1211 | c1 = utf8n_to_uvchr(tmpbuf1, UTF8_MAXBYTES_CASE, |
| 1212 | 0, uniflags); |
| 1213 | c2 = utf8n_to_uvchr(tmpbuf2, UTF8_MAXBYTES_CASE, |
| 1214 | 0, uniflags); |
| 1215 | lnc = 0; |
| 1216 | while (sm < ((U8 *) m + ln)) { |
| 1217 | lnc++; |
| 1218 | sm += UTF8SKIP(sm); |
| 1219 | } |
| 1220 | } |
| 1221 | else { |
| 1222 | c1 = *(U8*)m; |
| 1223 | c2 = PL_fold[c1]; |
| 1224 | } |
| 1225 | goto do_exactf; |
| 1226 | case EXACTFL: |
| 1227 | m = STRING(c); |
| 1228 | ln = STR_LEN(c); |
| 1229 | lnc = (I32) ln; |
| 1230 | c1 = *(U8*)m; |
| 1231 | c2 = PL_fold_locale[c1]; |
| 1232 | do_exactf: |
| 1233 | e = HOP3c(strend, -((I32)lnc), s); |
| 1234 | |
| 1235 | if (!reginfo && e < s) |
| 1236 | e = s; /* Due to minlen logic of intuit() */ |
| 1237 | |
| 1238 | /* The idea in the EXACTF* cases is to first find the |
| 1239 | * first character of the EXACTF* node and then, if |
| 1240 | * necessary, case-insensitively compare the full |
| 1241 | * text of the node. The c1 and c2 are the first |
| 1242 | * characters (though in Unicode it gets a bit |
| 1243 | * more complicated because there are more cases |
| 1244 | * than just upper and lower: one needs to use |
| 1245 | * the so-called folding case for case-insensitive |
| 1246 | * matching (called "loose matching" in Unicode). |
| 1247 | * ibcmp_utf8() will do just that. */ |
| 1248 | |
| 1249 | if (do_utf8) { |
| 1250 | UV c, f; |
| 1251 | U8 tmpbuf [UTF8_MAXBYTES+1]; |
| 1252 | STRLEN len, foldlen; |
| 1253 | const U32 uniflags = UTF8_ALLOW_DEFAULT; |
| 1254 | if (c1 == c2) { |
| 1255 | /* Upper and lower of 1st char are equal - |
| 1256 | * probably not a "letter". */ |
| 1257 | while (s <= e) { |
| 1258 | c = utf8n_to_uvchr((U8*)s, UTF8_MAXBYTES, &len, |
| 1259 | uniflags); |
| 1260 | REXEC_FBC_EXACTISH_CHECK(c == c1); |
| 1261 | } |
| 1262 | } |
| 1263 | else { |
| 1264 | while (s <= e) { |
| 1265 | c = utf8n_to_uvchr((U8*)s, UTF8_MAXBYTES, &len, |
| 1266 | uniflags); |
| 1267 | |
| 1268 | /* Handle some of the three Greek sigmas cases. |
| 1269 | * Note that not all the possible combinations |
| 1270 | * are handled here: some of them are handled |
| 1271 | * by the standard folding rules, and some of |
| 1272 | * them (the character class or ANYOF cases) |
| 1273 | * are handled during compiletime in |
| 1274 | * regexec.c:S_regclass(). */ |
| 1275 | if (c == (UV)UNICODE_GREEK_CAPITAL_LETTER_SIGMA || |
| 1276 | c == (UV)UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA) |
| 1277 | c = (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA; |
| 1278 | |
| 1279 | REXEC_FBC_EXACTISH_CHECK(c == c1 || c == c2); |
| 1280 | } |
| 1281 | } |
| 1282 | } |
| 1283 | else { |
| 1284 | if (c1 == c2) |
| 1285 | REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1); |
| 1286 | else |
| 1287 | REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1 || *(U8*)s == c2); |
| 1288 | } |
| 1289 | break; |
| 1290 | case BOUNDL: |
| 1291 | PL_reg_flags |= RF_tainted; |
| 1292 | /* FALL THROUGH */ |
| 1293 | case BOUND: |
| 1294 | if (do_utf8) { |
| 1295 | if (s == PL_bostr) |
| 1296 | tmp = '\n'; |
| 1297 | else { |
| 1298 | U8 * const r = reghop3((U8*)s, -1, (U8*)PL_bostr); |
| 1299 | tmp = utf8n_to_uvchr(r, UTF8SKIP(r), 0, UTF8_ALLOW_DEFAULT); |
| 1300 | } |
| 1301 | tmp = ((OP(c) == BOUND ? |
| 1302 | isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0); |
| 1303 | LOAD_UTF8_CHARCLASS_ALNUM(); |
| 1304 | REXEC_FBC_UTF8_SCAN( |
| 1305 | if (tmp == !(OP(c) == BOUND ? |
| 1306 | (bool)swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) : |
| 1307 | isALNUM_LC_utf8((U8*)s))) |
| 1308 | { |
| 1309 | tmp = !tmp; |
| 1310 | REXEC_FBC_TRYIT; |
| 1311 | } |
| 1312 | ); |
| 1313 | } |
| 1314 | else { |
| 1315 | tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n'; |
| 1316 | tmp = ((OP(c) == BOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0); |
| 1317 | REXEC_FBC_SCAN( |
| 1318 | if (tmp == |
| 1319 | !(OP(c) == BOUND ? isALNUM(*s) : isALNUM_LC(*s))) { |
| 1320 | tmp = !tmp; |
| 1321 | REXEC_FBC_TRYIT; |
| 1322 | } |
| 1323 | ); |
| 1324 | } |
| 1325 | if ((!prog->minlen && tmp) && (!reginfo || regtry(reginfo, &s))) |
| 1326 | goto got_it; |
| 1327 | break; |
| 1328 | case NBOUNDL: |
| 1329 | PL_reg_flags |= RF_tainted; |
| 1330 | /* FALL THROUGH */ |
| 1331 | case NBOUND: |
| 1332 | if (do_utf8) { |
| 1333 | if (s == PL_bostr) |
| 1334 | tmp = '\n'; |
| 1335 | else { |
| 1336 | U8 * const r = reghop3((U8*)s, -1, (U8*)PL_bostr); |
| 1337 | tmp = utf8n_to_uvchr(r, UTF8SKIP(r), 0, UTF8_ALLOW_DEFAULT); |
| 1338 | } |
| 1339 | tmp = ((OP(c) == NBOUND ? |
| 1340 | isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0); |
| 1341 | LOAD_UTF8_CHARCLASS_ALNUM(); |
| 1342 | REXEC_FBC_UTF8_SCAN( |
| 1343 | if (tmp == !(OP(c) == NBOUND ? |
| 1344 | (bool)swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) : |
| 1345 | isALNUM_LC_utf8((U8*)s))) |
| 1346 | tmp = !tmp; |
| 1347 | else REXEC_FBC_TRYIT; |
| 1348 | ); |
| 1349 | } |
| 1350 | else { |
| 1351 | tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n'; |
| 1352 | tmp = ((OP(c) == NBOUND ? |
| 1353 | isALNUM(tmp) : isALNUM_LC(tmp)) != 0); |
| 1354 | REXEC_FBC_SCAN( |
| 1355 | if (tmp == |
| 1356 | !(OP(c) == NBOUND ? isALNUM(*s) : isALNUM_LC(*s))) |
| 1357 | tmp = !tmp; |
| 1358 | else REXEC_FBC_TRYIT; |
| 1359 | ); |
| 1360 | } |
| 1361 | if ((!prog->minlen && !tmp) && (!reginfo || regtry(reginfo, &s))) |
| 1362 | goto got_it; |
| 1363 | break; |
| 1364 | case ALNUM: |
| 1365 | REXEC_FBC_CSCAN_PRELOAD( |
| 1366 | LOAD_UTF8_CHARCLASS_ALNUM(), |
| 1367 | swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8), |
| 1368 | isALNUM(*s) |
| 1369 | ); |
| 1370 | case ALNUML: |
| 1371 | REXEC_FBC_CSCAN_TAINT( |
| 1372 | isALNUM_LC_utf8((U8*)s), |
| 1373 | isALNUM_LC(*s) |
| 1374 | ); |
| 1375 | case NALNUM: |
| 1376 | REXEC_FBC_CSCAN_PRELOAD( |
| 1377 | LOAD_UTF8_CHARCLASS_ALNUM(), |
| 1378 | !swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8), |
| 1379 | !isALNUM(*s) |
| 1380 | ); |
| 1381 | case NALNUML: |
| 1382 | REXEC_FBC_CSCAN_TAINT( |
| 1383 | !isALNUM_LC_utf8((U8*)s), |
| 1384 | !isALNUM_LC(*s) |
| 1385 | ); |
| 1386 | case SPACE: |
| 1387 | REXEC_FBC_CSCAN_PRELOAD( |
| 1388 | LOAD_UTF8_CHARCLASS_SPACE(), |
| 1389 | *s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8), |
| 1390 | isSPACE(*s) |
| 1391 | ); |
| 1392 | case SPACEL: |
| 1393 | REXEC_FBC_CSCAN_TAINT( |
| 1394 | *s == ' ' || isSPACE_LC_utf8((U8*)s), |
| 1395 | isSPACE_LC(*s) |
| 1396 | ); |
| 1397 | case NSPACE: |
| 1398 | REXEC_FBC_CSCAN_PRELOAD( |
| 1399 | LOAD_UTF8_CHARCLASS_SPACE(), |
| 1400 | !(*s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8)), |
| 1401 | !isSPACE(*s) |
| 1402 | ); |
| 1403 | case NSPACEL: |
| 1404 | REXEC_FBC_CSCAN_TAINT( |
| 1405 | !(*s == ' ' || isSPACE_LC_utf8((U8*)s)), |
| 1406 | !isSPACE_LC(*s) |
| 1407 | ); |
| 1408 | case DIGIT: |
| 1409 | REXEC_FBC_CSCAN_PRELOAD( |
| 1410 | LOAD_UTF8_CHARCLASS_DIGIT(), |
| 1411 | swash_fetch(PL_utf8_digit,(U8*)s, do_utf8), |
| 1412 | isDIGIT(*s) |
| 1413 | ); |
| 1414 | case DIGITL: |
| 1415 | REXEC_FBC_CSCAN_TAINT( |
| 1416 | isDIGIT_LC_utf8((U8*)s), |
| 1417 | isDIGIT_LC(*s) |
| 1418 | ); |
| 1419 | case NDIGIT: |
| 1420 | REXEC_FBC_CSCAN_PRELOAD( |
| 1421 | LOAD_UTF8_CHARCLASS_DIGIT(), |
| 1422 | !swash_fetch(PL_utf8_digit,(U8*)s, do_utf8), |
| 1423 | !isDIGIT(*s) |
| 1424 | ); |
| 1425 | case NDIGITL: |
| 1426 | REXEC_FBC_CSCAN_TAINT( |
| 1427 | !isDIGIT_LC_utf8((U8*)s), |
| 1428 | !isDIGIT_LC(*s) |
| 1429 | ); |
| 1430 | case AHOCORASICKC: |
| 1431 | case AHOCORASICK: |
| 1432 | { |
| 1433 | const enum { trie_plain, trie_utf8, trie_utf8_fold } |
| 1434 | trie_type = do_utf8 ? |
| 1435 | (c->flags == EXACT ? trie_utf8 : trie_utf8_fold) |
| 1436 | : trie_plain; |
| 1437 | /* what trie are we using right now */ |
| 1438 | reg_ac_data *aho |
| 1439 | = (reg_ac_data*)progi->data->data[ ARG( c ) ]; |
| 1440 | reg_trie_data *trie |
| 1441 | = (reg_trie_data*)progi->data->data[ aho->trie ]; |
| 1442 | HV *widecharmap = (HV*) progi->data->data[ aho->trie + 1 ]; |
| 1443 | |
| 1444 | const char *last_start = strend - trie->minlen; |
| 1445 | #ifdef DEBUGGING |
| 1446 | const char *real_start = s; |
| 1447 | #endif |
| 1448 | STRLEN maxlen = trie->maxlen; |
| 1449 | SV *sv_points; |
| 1450 | U8 **points; /* map of where we were in the input string |
| 1451 | when reading a given char. For ASCII this |
| 1452 | is unnecessary overhead as the relationship |
| 1453 | is always 1:1, but for unicode, especially |
| 1454 | case folded unicode this is not true. */ |
| 1455 | U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ]; |
| 1456 | U8 *bitmap=NULL; |
| 1457 | |
| 1458 | |
| 1459 | GET_RE_DEBUG_FLAGS_DECL; |
| 1460 | |
| 1461 | /* We can't just allocate points here. We need to wrap it in |
| 1462 | * an SV so it gets freed properly if there is a croak while |
| 1463 | * running the match */ |
| 1464 | ENTER; |
| 1465 | SAVETMPS; |
| 1466 | sv_points=newSV(maxlen * sizeof(U8 *)); |
| 1467 | SvCUR_set(sv_points, |
| 1468 | maxlen * sizeof(U8 *)); |
| 1469 | SvPOK_on(sv_points); |
| 1470 | sv_2mortal(sv_points); |
| 1471 | points=(U8**)SvPV_nolen(sv_points ); |
| 1472 | if ( trie_type != trie_utf8_fold |
| 1473 | && (trie->bitmap || OP(c)==AHOCORASICKC) ) |
| 1474 | { |
| 1475 | if (trie->bitmap) |
| 1476 | bitmap=(U8*)trie->bitmap; |
| 1477 | else |
| 1478 | bitmap=(U8*)ANYOF_BITMAP(c); |
| 1479 | } |
| 1480 | /* this is the Aho-Corasick algorithm modified a touch |
| 1481 | to include special handling for long "unknown char" |
| 1482 | sequences. The basic idea being that we use AC as long |
| 1483 | as we are dealing with a possible matching char, when |
| 1484 | we encounter an unknown char (and we have not encountered |
| 1485 | an accepting state) we scan forward until we find a legal |
| 1486 | starting char. |
| 1487 | AC matching is basically that of trie matching, except |
| 1488 | that when we encounter a failing transition, we fall back |
| 1489 | to the current states "fail state", and try the current char |
| 1490 | again, a process we repeat until we reach the root state, |
| 1491 | state 1, or a legal transition. If we fail on the root state |
| 1492 | then we can either terminate if we have reached an accepting |
| 1493 | state previously, or restart the entire process from the beginning |
| 1494 | if we have not. |
| 1495 | |
| 1496 | */ |
| 1497 | while (s <= last_start) { |
| 1498 | const U32 uniflags = UTF8_ALLOW_DEFAULT; |
| 1499 | U8 *uc = (U8*)s; |
| 1500 | U16 charid = 0; |
| 1501 | U32 base = 1; |
| 1502 | U32 state = 1; |
| 1503 | UV uvc = 0; |
| 1504 | STRLEN len = 0; |
| 1505 | STRLEN foldlen = 0; |
| 1506 | U8 *uscan = (U8*)NULL; |
| 1507 | U8 *leftmost = NULL; |
| 1508 | #ifdef DEBUGGING |
| 1509 | U32 accepted_word= 0; |
| 1510 | #endif |
| 1511 | U32 pointpos = 0; |
| 1512 | |
| 1513 | while ( state && uc <= (U8*)strend ) { |
| 1514 | int failed=0; |
| 1515 | U32 word = aho->states[ state ].wordnum; |
| 1516 | |
| 1517 | if( state==1 ) { |
| 1518 | if ( bitmap ) { |
| 1519 | DEBUG_TRIE_EXECUTE_r( |
| 1520 | if ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) { |
| 1521 | dump_exec_pos( (char *)uc, c, strend, real_start, |
| 1522 | (char *)uc, do_utf8 ); |
| 1523 | PerlIO_printf( Perl_debug_log, |
| 1524 | " Scanning for legal start char...\n"); |
| 1525 | } |
| 1526 | ); |
| 1527 | while ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) { |
| 1528 | uc++; |
| 1529 | } |
| 1530 | s= (char *)uc; |
| 1531 | } |
| 1532 | if (uc >(U8*)last_start) break; |
| 1533 | } |
| 1534 | |
| 1535 | if ( word ) { |
| 1536 | U8 *lpos= points[ (pointpos - trie->wordlen[word-1] ) % maxlen ]; |
| 1537 | if (!leftmost || lpos < leftmost) { |
| 1538 | DEBUG_r(accepted_word=word); |
| 1539 | leftmost= lpos; |
| 1540 | } |
| 1541 | if (base==0) break; |
| 1542 | |
| 1543 | } |
| 1544 | points[pointpos++ % maxlen]= uc; |
| 1545 | REXEC_TRIE_READ_CHAR(trie_type, trie, widecharmap, uc, |
| 1546 | uscan, len, uvc, charid, foldlen, |
| 1547 | foldbuf, uniflags); |
| 1548 | DEBUG_TRIE_EXECUTE_r({ |
| 1549 | dump_exec_pos( (char *)uc, c, strend, real_start, |
| 1550 | s, do_utf8 ); |
| 1551 | PerlIO_printf(Perl_debug_log, |
| 1552 | " Charid:%3u CP:%4"UVxf" ", |
| 1553 | charid, uvc); |
| 1554 | }); |
| 1555 | |
| 1556 | do { |
| 1557 | #ifdef DEBUGGING |
| 1558 | word = aho->states[ state ].wordnum; |
| 1559 | #endif |
| 1560 | base = aho->states[ state ].trans.base; |
| 1561 | |
| 1562 | DEBUG_TRIE_EXECUTE_r({ |
| 1563 | if (failed) |
| 1564 | dump_exec_pos( (char *)uc, c, strend, real_start, |
| 1565 | s, do_utf8 ); |
| 1566 | PerlIO_printf( Perl_debug_log, |
| 1567 | "%sState: %4"UVxf", word=%"UVxf, |
| 1568 | failed ? " Fail transition to " : "", |
| 1569 | (UV)state, (UV)word); |
| 1570 | }); |
| 1571 | if ( base ) { |
| 1572 | U32 tmp; |
| 1573 | if (charid && |
| 1574 | (base + charid > trie->uniquecharcount ) |
| 1575 | && (base + charid - 1 - trie->uniquecharcount |
| 1576 | < trie->lasttrans) |
| 1577 | && trie->trans[base + charid - 1 - |
| 1578 | trie->uniquecharcount].check == state |
| 1579 | && (tmp=trie->trans[base + charid - 1 - |
| 1580 | trie->uniquecharcount ].next)) |
| 1581 | { |
| 1582 | DEBUG_TRIE_EXECUTE_r( |
| 1583 | PerlIO_printf( Perl_debug_log," - legal\n")); |
| 1584 | state = tmp; |
| 1585 | break; |
| 1586 | } |
| 1587 | else { |
| 1588 | DEBUG_TRIE_EXECUTE_r( |
| 1589 | PerlIO_printf( Perl_debug_log," - fail\n")); |
| 1590 | failed = 1; |
| 1591 | state = aho->fail[state]; |
| 1592 | } |
| 1593 | } |
| 1594 | else { |
| 1595 | /* we must be accepting here */ |
| 1596 | DEBUG_TRIE_EXECUTE_r( |
| 1597 | PerlIO_printf( Perl_debug_log," - accepting\n")); |
| 1598 | failed = 1; |
| 1599 | break; |
| 1600 | } |
| 1601 | } while(state); |
| 1602 | uc += len; |
| 1603 | if (failed) { |
| 1604 | if (leftmost) |
| 1605 | break; |
| 1606 | if (!state) state = 1; |
| 1607 | } |
| 1608 | } |
| 1609 | if ( aho->states[ state ].wordnum ) { |
| 1610 | U8 *lpos = points[ (pointpos - trie->wordlen[aho->states[ state ].wordnum-1]) % maxlen ]; |
| 1611 | if (!leftmost || lpos < leftmost) { |
| 1612 | DEBUG_r(accepted_word=aho->states[ state ].wordnum); |
| 1613 | leftmost = lpos; |
| 1614 | } |
| 1615 | } |
| 1616 | if (leftmost) { |
| 1617 | s = (char*)leftmost; |
| 1618 | DEBUG_TRIE_EXECUTE_r({ |
| 1619 | PerlIO_printf( |
| 1620 | Perl_debug_log,"Matches word #%"UVxf" at position %"IVdf". Trying full pattern...\n", |
| 1621 | (UV)accepted_word, (IV)(s - real_start) |
| 1622 | ); |
| 1623 | }); |
| 1624 | if (!reginfo || regtry(reginfo, &s)) { |
| 1625 | FREETMPS; |
| 1626 | LEAVE; |
| 1627 | goto got_it; |
| 1628 | } |
| 1629 | s = HOPc(s,1); |
| 1630 | DEBUG_TRIE_EXECUTE_r({ |
| 1631 | PerlIO_printf( Perl_debug_log,"Pattern failed. Looking for new start point...\n"); |
| 1632 | }); |
| 1633 | } else { |
| 1634 | DEBUG_TRIE_EXECUTE_r( |
| 1635 | PerlIO_printf( Perl_debug_log,"No match.\n")); |
| 1636 | break; |
| 1637 | } |
| 1638 | } |
| 1639 | FREETMPS; |
| 1640 | LEAVE; |
| 1641 | } |
| 1642 | break; |
| 1643 | default: |
| 1644 | Perl_croak(aTHX_ "panic: unknown regstclass %d", (int)OP(c)); |
| 1645 | break; |
| 1646 | } |
| 1647 | return 0; |
| 1648 | got_it: |
| 1649 | return s; |
| 1650 | } |
| 1651 | |
| 1652 | static void |
| 1653 | S_swap_match_buff (pTHX_ regexp *prog) { |
| 1654 | I32 *t; |
| 1655 | |
| 1656 | if (!prog->swap) { |
| 1657 | /* We have to be careful. If the previous successful match |
| 1658 | was from this regex we don't want a subsequent paritally |
| 1659 | successful match to clobber the old results. |
| 1660 | So when we detect this possibility we add a swap buffer |
| 1661 | to the re, and switch the buffer each match. If we fail |
| 1662 | we switch it back, otherwise we leave it swapped. |
| 1663 | */ |
| 1664 | Newxz(prog->swap, 1, regexp_paren_ofs); |
| 1665 | /* no need to copy these */ |
| 1666 | Newxz(prog->swap->startp, 2 * (prog->nparens + 1), I32); |
| 1667 | prog->swap->endp = prog->swap->startp + prog->nparens + 1; |
| 1668 | } |
| 1669 | t = prog->swap->startp; |
| 1670 | prog->swap->startp = prog->startp; |
| 1671 | prog->startp = t; |
| 1672 | t = prog->swap->endp; |
| 1673 | prog->swap->endp = prog->endp; |
| 1674 | prog->endp = t; |
| 1675 | } |
| 1676 | |
| 1677 | |
| 1678 | /* |
| 1679 | - regexec_flags - match a regexp against a string |
| 1680 | */ |
| 1681 | I32 |
| 1682 | Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *strend, |
| 1683 | char *strbeg, I32 minend, SV *sv, void *data, U32 flags) |
| 1684 | /* strend: pointer to null at end of string */ |
| 1685 | /* strbeg: real beginning of string */ |
| 1686 | /* minend: end of match must be >=minend after stringarg. */ |
| 1687 | /* data: May be used for some additional optimizations. |
| 1688 | Currently its only used, with a U32 cast, for transmitting |
| 1689 | the ganch offset when doing a /g match. This will change */ |
| 1690 | /* nosave: For optimizations. */ |
| 1691 | { |
| 1692 | dVAR; |
| 1693 | /*register*/ char *s; |
| 1694 | register regnode *c; |
| 1695 | /*register*/ char *startpos = stringarg; |
| 1696 | I32 minlen; /* must match at least this many chars */ |
| 1697 | I32 dontbother = 0; /* how many characters not to try at end */ |
| 1698 | I32 end_shift = 0; /* Same for the end. */ /* CC */ |
| 1699 | I32 scream_pos = -1; /* Internal iterator of scream. */ |
| 1700 | char *scream_olds = NULL; |
| 1701 | SV* const oreplsv = GvSV(PL_replgv); |
| 1702 | const bool do_utf8 = (bool)DO_UTF8(sv); |
| 1703 | I32 multiline; |
| 1704 | RXi_GET_DECL(prog,progi); |
| 1705 | regmatch_info reginfo; /* create some info to pass to regtry etc */ |
| 1706 | bool swap_on_fail = 0; |
| 1707 | |
| 1708 | GET_RE_DEBUG_FLAGS_DECL; |
| 1709 | |
| 1710 | PERL_UNUSED_ARG(data); |
| 1711 | |
| 1712 | /* Be paranoid... */ |
| 1713 | if (prog == NULL || startpos == NULL) { |
| 1714 | Perl_croak(aTHX_ "NULL regexp parameter"); |
| 1715 | return 0; |
| 1716 | } |
| 1717 | |
| 1718 | multiline = prog->extflags & RXf_PMf_MULTILINE; |
| 1719 | reginfo.prog = prog; |
| 1720 | |
| 1721 | RX_MATCH_UTF8_set(prog, do_utf8); |
| 1722 | DEBUG_EXECUTE_r( |
| 1723 | debug_start_match(prog, do_utf8, startpos, strend, |
| 1724 | "Matching"); |
| 1725 | ); |
| 1726 | |
| 1727 | minlen = prog->minlen; |
| 1728 | |
| 1729 | if (strend - startpos < (minlen+(prog->check_offset_min<0?prog->check_offset_min:0))) { |
| 1730 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 1731 | "String too short [regexec_flags]...\n")); |
| 1732 | goto phooey; |
| 1733 | } |
| 1734 | |
| 1735 | |
| 1736 | /* Check validity of program. */ |
| 1737 | if (UCHARAT(progi->program) != REG_MAGIC) { |
| 1738 | Perl_croak(aTHX_ "corrupted regexp program"); |
| 1739 | } |
| 1740 | |
| 1741 | PL_reg_flags = 0; |
| 1742 | PL_reg_eval_set = 0; |
| 1743 | PL_reg_maxiter = 0; |
| 1744 | |
| 1745 | if (prog->extflags & RXf_UTF8) |
| 1746 | PL_reg_flags |= RF_utf8; |
| 1747 | |
| 1748 | /* Mark beginning of line for ^ and lookbehind. */ |
| 1749 | reginfo.bol = startpos; /* XXX not used ??? */ |
| 1750 | PL_bostr = strbeg; |
| 1751 | reginfo.sv = sv; |
| 1752 | |
| 1753 | /* Mark end of line for $ (and such) */ |
| 1754 | PL_regeol = strend; |
| 1755 | |
| 1756 | /* see how far we have to get to not match where we matched before */ |
| 1757 | reginfo.till = startpos+minend; |
| 1758 | |
| 1759 | /* If there is a "must appear" string, look for it. */ |
| 1760 | s = startpos; |
| 1761 | |
| 1762 | if (prog->extflags & RXf_GPOS_SEEN) { /* Need to set reginfo->ganch */ |
| 1763 | MAGIC *mg; |
| 1764 | |
| 1765 | if (flags & REXEC_IGNOREPOS) /* Means: check only at start */ |
| 1766 | reginfo.ganch = startpos + prog->gofs; |
| 1767 | else if (sv && SvTYPE(sv) >= SVt_PVMG |
| 1768 | && SvMAGIC(sv) |
| 1769 | && (mg = mg_find(sv, PERL_MAGIC_regex_global)) |
| 1770 | && mg->mg_len >= 0) { |
| 1771 | reginfo.ganch = strbeg + mg->mg_len; /* Defined pos() */ |
| 1772 | if (prog->extflags & RXf_ANCH_GPOS) { |
| 1773 | if (s > reginfo.ganch) |
| 1774 | goto phooey; |
| 1775 | s = reginfo.ganch - prog->gofs; |
| 1776 | } |
| 1777 | } |
| 1778 | else if (data) { |
| 1779 | reginfo.ganch = strbeg + PTR2UV(data); |
| 1780 | } else /* pos() not defined */ |
| 1781 | reginfo.ganch = strbeg; |
| 1782 | } |
| 1783 | if (PL_curpm && (PM_GETRE(PL_curpm) == prog)) { |
| 1784 | swap_on_fail = 1; |
| 1785 | swap_match_buff(prog); /* do we need a save destructor here for |
| 1786 | eval dies? */ |
| 1787 | } |
| 1788 | if (!(flags & REXEC_CHECKED) && (prog->check_substr != NULL || prog->check_utf8 != NULL)) { |
| 1789 | re_scream_pos_data d; |
| 1790 | |
| 1791 | d.scream_olds = &scream_olds; |
| 1792 | d.scream_pos = &scream_pos; |
| 1793 | s = re_intuit_start(prog, sv, s, strend, flags, &d); |
| 1794 | if (!s) { |
| 1795 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Not present...\n")); |
| 1796 | goto phooey; /* not present */ |
| 1797 | } |
| 1798 | } |
| 1799 | |
| 1800 | |
| 1801 | |
| 1802 | /* Simplest case: anchored match need be tried only once. */ |
| 1803 | /* [unless only anchor is BOL and multiline is set] */ |
| 1804 | if (prog->extflags & (RXf_ANCH & ~RXf_ANCH_GPOS)) { |
| 1805 | if (s == startpos && regtry(®info, &startpos)) |
| 1806 | goto got_it; |
| 1807 | else if (multiline || (prog->intflags & PREGf_IMPLICIT) |
| 1808 | || (prog->extflags & RXf_ANCH_MBOL)) /* XXXX SBOL? */ |
| 1809 | { |
| 1810 | char *end; |
| 1811 | |
| 1812 | if (minlen) |
| 1813 | dontbother = minlen - 1; |
| 1814 | end = HOP3c(strend, -dontbother, strbeg) - 1; |
| 1815 | /* for multiline we only have to try after newlines */ |
| 1816 | if (prog->check_substr || prog->check_utf8) { |
| 1817 | if (s == startpos) |
| 1818 | goto after_try; |
| 1819 | while (1) { |
| 1820 | if (regtry(®info, &s)) |
| 1821 | goto got_it; |
| 1822 | after_try: |
| 1823 | if (s >= end) |
| 1824 | goto phooey; |
| 1825 | if (prog->extflags & RXf_USE_INTUIT) { |
| 1826 | s = re_intuit_start(prog, sv, s + 1, strend, flags, NULL); |
| 1827 | if (!s) |
| 1828 | goto phooey; |
| 1829 | } |
| 1830 | else |
| 1831 | s++; |
| 1832 | } |
| 1833 | } else { |
| 1834 | if (s > startpos) |
| 1835 | s--; |
| 1836 | while (s < end) { |
| 1837 | if (*s++ == '\n') { /* don't need PL_utf8skip here */ |
| 1838 | if (regtry(®info, &s)) |
| 1839 | goto got_it; |
| 1840 | } |
| 1841 | } |
| 1842 | } |
| 1843 | } |
| 1844 | goto phooey; |
| 1845 | } else if (RXf_GPOS_CHECK == (prog->extflags & RXf_GPOS_CHECK)) |
| 1846 | { |
| 1847 | /* the warning about reginfo.ganch being used without intialization |
| 1848 | is bogus -- we set it above, when prog->extflags & RXf_GPOS_SEEN |
| 1849 | and we only enter this block when the same bit is set. */ |
| 1850 | char *tmp_s = reginfo.ganch - prog->gofs; |
| 1851 | if (regtry(®info, &tmp_s)) |
| 1852 | goto got_it; |
| 1853 | goto phooey; |
| 1854 | } |
| 1855 | |
| 1856 | /* Messy cases: unanchored match. */ |
| 1857 | if ((prog->anchored_substr || prog->anchored_utf8) && prog->intflags & PREGf_SKIP) { |
| 1858 | /* we have /x+whatever/ */ |
| 1859 | /* it must be a one character string (XXXX Except UTF?) */ |
| 1860 | char ch; |
| 1861 | #ifdef DEBUGGING |
| 1862 | int did_match = 0; |
| 1863 | #endif |
| 1864 | if (!(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)) |
| 1865 | do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); |
| 1866 | ch = SvPVX_const(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)[0]; |
| 1867 | |
| 1868 | if (do_utf8) { |
| 1869 | REXEC_FBC_SCAN( |
| 1870 | if (*s == ch) { |
| 1871 | DEBUG_EXECUTE_r( did_match = 1 ); |
| 1872 | if (regtry(®info, &s)) goto got_it; |
| 1873 | s += UTF8SKIP(s); |
| 1874 | while (s < strend && *s == ch) |
| 1875 | s += UTF8SKIP(s); |
| 1876 | } |
| 1877 | ); |
| 1878 | } |
| 1879 | else { |
| 1880 | REXEC_FBC_SCAN( |
| 1881 | if (*s == ch) { |
| 1882 | DEBUG_EXECUTE_r( did_match = 1 ); |
| 1883 | if (regtry(®info, &s)) goto got_it; |
| 1884 | s++; |
| 1885 | while (s < strend && *s == ch) |
| 1886 | s++; |
| 1887 | } |
| 1888 | ); |
| 1889 | } |
| 1890 | DEBUG_EXECUTE_r(if (!did_match) |
| 1891 | PerlIO_printf(Perl_debug_log, |
| 1892 | "Did not find anchored character...\n") |
| 1893 | ); |
| 1894 | } |
| 1895 | else if (prog->anchored_substr != NULL |
| 1896 | || prog->anchored_utf8 != NULL |
| 1897 | || ((prog->float_substr != NULL || prog->float_utf8 != NULL) |
| 1898 | && prog->float_max_offset < strend - s)) { |
| 1899 | SV *must; |
| 1900 | I32 back_max; |
| 1901 | I32 back_min; |
| 1902 | char *last; |
| 1903 | char *last1; /* Last position checked before */ |
| 1904 | #ifdef DEBUGGING |
| 1905 | int did_match = 0; |
| 1906 | #endif |
| 1907 | if (prog->anchored_substr || prog->anchored_utf8) { |
| 1908 | if (!(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)) |
| 1909 | do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); |
| 1910 | must = do_utf8 ? prog->anchored_utf8 : prog->anchored_substr; |
| 1911 | back_max = back_min = prog->anchored_offset; |
| 1912 | } else { |
| 1913 | if (!(do_utf8 ? prog->float_utf8 : prog->float_substr)) |
| 1914 | do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); |
| 1915 | must = do_utf8 ? prog->float_utf8 : prog->float_substr; |
| 1916 | back_max = prog->float_max_offset; |
| 1917 | back_min = prog->float_min_offset; |
| 1918 | } |
| 1919 | |
| 1920 | |
| 1921 | if (must == &PL_sv_undef) |
| 1922 | /* could not downgrade utf8 check substring, so must fail */ |
| 1923 | goto phooey; |
| 1924 | |
| 1925 | if (back_min<0) { |
| 1926 | last = strend; |
| 1927 | } else { |
| 1928 | last = HOP3c(strend, /* Cannot start after this */ |
| 1929 | -(I32)(CHR_SVLEN(must) |
| 1930 | - (SvTAIL(must) != 0) + back_min), strbeg); |
| 1931 | } |
| 1932 | if (s > PL_bostr) |
| 1933 | last1 = HOPc(s, -1); |
| 1934 | else |
| 1935 | last1 = s - 1; /* bogus */ |
| 1936 | |
| 1937 | /* XXXX check_substr already used to find "s", can optimize if |
| 1938 | check_substr==must. */ |
| 1939 | scream_pos = -1; |
| 1940 | dontbother = end_shift; |
| 1941 | strend = HOPc(strend, -dontbother); |
| 1942 | while ( (s <= last) && |
| 1943 | ((flags & REXEC_SCREAM) |
| 1944 | ? (s = screaminstr(sv, must, HOP3c(s, back_min, (back_min<0 ? strbeg : strend)) - strbeg, |
| 1945 | end_shift, &scream_pos, 0)) |
| 1946 | : (s = fbm_instr((unsigned char*)HOP3(s, back_min, (back_min<0 ? strbeg : strend)), |
| 1947 | (unsigned char*)strend, must, |
| 1948 | multiline ? FBMrf_MULTILINE : 0))) ) { |
| 1949 | /* we may be pointing at the wrong string */ |
| 1950 | if ((flags & REXEC_SCREAM) && RX_MATCH_COPIED(prog)) |
| 1951 | s = strbeg + (s - SvPVX_const(sv)); |
| 1952 | DEBUG_EXECUTE_r( did_match = 1 ); |
| 1953 | if (HOPc(s, -back_max) > last1) { |
| 1954 | last1 = HOPc(s, -back_min); |
| 1955 | s = HOPc(s, -back_max); |
| 1956 | } |
| 1957 | else { |
| 1958 | char * const t = (last1 >= PL_bostr) ? HOPc(last1, 1) : last1 + 1; |
| 1959 | |
| 1960 | last1 = HOPc(s, -back_min); |
| 1961 | s = t; |
| 1962 | } |
| 1963 | if (do_utf8) { |
| 1964 | while (s <= last1) { |
| 1965 | if (regtry(®info, &s)) |
| 1966 | goto got_it; |
| 1967 | s += UTF8SKIP(s); |
| 1968 | } |
| 1969 | } |
| 1970 | else { |
| 1971 | while (s <= last1) { |
| 1972 | if (regtry(®info, &s)) |
| 1973 | goto got_it; |
| 1974 | s++; |
| 1975 | } |
| 1976 | } |
| 1977 | } |
| 1978 | DEBUG_EXECUTE_r(if (!did_match) { |
| 1979 | RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), |
| 1980 | SvPVX_const(must), RE_SV_DUMPLEN(must), 30); |
| 1981 | PerlIO_printf(Perl_debug_log, "Did not find %s substr %s%s...\n", |
| 1982 | ((must == prog->anchored_substr || must == prog->anchored_utf8) |
| 1983 | ? "anchored" : "floating"), |
| 1984 | quoted, RE_SV_TAIL(must)); |
| 1985 | }); |
| 1986 | goto phooey; |
| 1987 | } |
| 1988 | else if ( (c = progi->regstclass) ) { |
| 1989 | if (minlen) { |
| 1990 | const OPCODE op = OP(progi->regstclass); |
| 1991 | /* don't bother with what can't match */ |
| 1992 | if (PL_regkind[op] != EXACT && op != CANY && PL_regkind[op] != TRIE) |
| 1993 | strend = HOPc(strend, -(minlen - 1)); |
| 1994 | } |
| 1995 | DEBUG_EXECUTE_r({ |
| 1996 | SV * const prop = sv_newmortal(); |
| 1997 | regprop(prog, prop, c); |
| 1998 | { |
| 1999 | RE_PV_QUOTED_DECL(quoted,do_utf8,PERL_DEBUG_PAD_ZERO(1), |
| 2000 | s,strend-s,60); |
| 2001 | PerlIO_printf(Perl_debug_log, |
| 2002 | "Matching stclass %.*s against %s (%d chars)\n", |
| 2003 | (int)SvCUR(prop), SvPVX_const(prop), |
| 2004 | quoted, (int)(strend - s)); |
| 2005 | } |
| 2006 | }); |
| 2007 | if (find_byclass(prog, c, s, strend, ®info)) |
| 2008 | goto got_it; |
| 2009 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Contradicts stclass... [regexec_flags]\n")); |
| 2010 | } |
| 2011 | else { |
| 2012 | dontbother = 0; |
| 2013 | if (prog->float_substr != NULL || prog->float_utf8 != NULL) { |
| 2014 | /* Trim the end. */ |
| 2015 | char *last; |
| 2016 | SV* float_real; |
| 2017 | |
| 2018 | if (!(do_utf8 ? prog->float_utf8 : prog->float_substr)) |
| 2019 | do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); |
| 2020 | float_real = do_utf8 ? prog->float_utf8 : prog->float_substr; |
| 2021 | |
| 2022 | if (flags & REXEC_SCREAM) { |
| 2023 | last = screaminstr(sv, float_real, s - strbeg, |
| 2024 | end_shift, &scream_pos, 1); /* last one */ |
| 2025 | if (!last) |
| 2026 | last = scream_olds; /* Only one occurrence. */ |
| 2027 | /* we may be pointing at the wrong string */ |
| 2028 | else if (RX_MATCH_COPIED(prog)) |
| 2029 | s = strbeg + (s - SvPVX_const(sv)); |
| 2030 | } |
| 2031 | else { |
| 2032 | STRLEN len; |
| 2033 | const char * const little = SvPV_const(float_real, len); |
| 2034 | |
| 2035 | if (SvTAIL(float_real)) { |
| 2036 | if (memEQ(strend - len + 1, little, len - 1)) |
| 2037 | last = strend - len + 1; |
| 2038 | else if (!multiline) |
| 2039 | last = memEQ(strend - len, little, len) |
| 2040 | ? strend - len : NULL; |
| 2041 | else |
| 2042 | goto find_last; |
| 2043 | } else { |
| 2044 | find_last: |
| 2045 | if (len) |
| 2046 | last = rninstr(s, strend, little, little + len); |
| 2047 | else |
| 2048 | last = strend; /* matching "$" */ |
| 2049 | } |
| 2050 | } |
| 2051 | if (last == NULL) { |
| 2052 | DEBUG_EXECUTE_r( |
| 2053 | PerlIO_printf(Perl_debug_log, |
| 2054 | "%sCan't trim the tail, match fails (should not happen)%s\n", |
| 2055 | PL_colors[4], PL_colors[5])); |
| 2056 | goto phooey; /* Should not happen! */ |
| 2057 | } |
| 2058 | dontbother = strend - last + prog->float_min_offset; |
| 2059 | } |
| 2060 | if (minlen && (dontbother < minlen)) |
| 2061 | dontbother = minlen - 1; |
| 2062 | strend -= dontbother; /* this one's always in bytes! */ |
| 2063 | /* We don't know much -- general case. */ |
| 2064 | if (do_utf8) { |
| 2065 | for (;;) { |
| 2066 | if (regtry(®info, &s)) |
| 2067 | goto got_it; |
| 2068 | if (s >= strend) |
| 2069 | break; |
| 2070 | s += UTF8SKIP(s); |
| 2071 | }; |
| 2072 | } |
| 2073 | else { |
| 2074 | do { |
| 2075 | if (regtry(®info, &s)) |
| 2076 | goto got_it; |
| 2077 | } while (s++ < strend); |
| 2078 | } |
| 2079 | } |
| 2080 | |
| 2081 | /* Failure. */ |
| 2082 | goto phooey; |
| 2083 | |
| 2084 | got_it: |
| 2085 | RX_MATCH_TAINTED_set(prog, PL_reg_flags & RF_tainted); |
| 2086 | |
| 2087 | if (PL_reg_eval_set) { |
| 2088 | /* Preserve the current value of $^R */ |
| 2089 | if (oreplsv != GvSV(PL_replgv)) |
| 2090 | sv_setsv(oreplsv, GvSV(PL_replgv));/* So that when GvSV(replgv) is |
| 2091 | restored, the value remains |
| 2092 | the same. */ |
| 2093 | restore_pos(aTHX_ prog); |
| 2094 | } |
| 2095 | if (prog->paren_names) |
| 2096 | (void)hv_iterinit(prog->paren_names); |
| 2097 | |
| 2098 | /* make sure $`, $&, $', and $digit will work later */ |
| 2099 | if ( !(flags & REXEC_NOT_FIRST) ) { |
| 2100 | RX_MATCH_COPY_FREE(prog); |
| 2101 | if (flags & REXEC_COPY_STR) { |
| 2102 | const I32 i = PL_regeol - startpos + (stringarg - strbeg); |
| 2103 | #ifdef PERL_OLD_COPY_ON_WRITE |
| 2104 | if ((SvIsCOW(sv) |
| 2105 | || (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS)) { |
| 2106 | if (DEBUG_C_TEST) { |
| 2107 | PerlIO_printf(Perl_debug_log, |
| 2108 | "Copy on write: regexp capture, type %d\n", |
| 2109 | (int) SvTYPE(sv)); |
| 2110 | } |
| 2111 | prog->saved_copy = sv_setsv_cow(prog->saved_copy, sv); |
| 2112 | prog->subbeg = (char *)SvPVX_const(prog->saved_copy); |
| 2113 | assert (SvPOKp(prog->saved_copy)); |
| 2114 | } else |
| 2115 | #endif |
| 2116 | { |
| 2117 | RX_MATCH_COPIED_on(prog); |
| 2118 | s = savepvn(strbeg, i); |
| 2119 | prog->subbeg = s; |
| 2120 | } |
| 2121 | prog->sublen = i; |
| 2122 | } |
| 2123 | else { |
| 2124 | prog->subbeg = strbeg; |
| 2125 | prog->sublen = PL_regeol - strbeg; /* strend may have been modified */ |
| 2126 | } |
| 2127 | } |
| 2128 | |
| 2129 | return 1; |
| 2130 | |
| 2131 | phooey: |
| 2132 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch failed%s\n", |
| 2133 | PL_colors[4], PL_colors[5])); |
| 2134 | if (PL_reg_eval_set) |
| 2135 | restore_pos(aTHX_ prog); |
| 2136 | if (swap_on_fail) |
| 2137 | /* we failed :-( roll it back */ |
| 2138 | swap_match_buff(prog); |
| 2139 | |
| 2140 | return 0; |
| 2141 | } |
| 2142 | |
| 2143 | |
| 2144 | /* |
| 2145 | - regtry - try match at specific point |
| 2146 | */ |
| 2147 | STATIC I32 /* 0 failure, 1 success */ |
| 2148 | S_regtry(pTHX_ regmatch_info *reginfo, char **startpos) |
| 2149 | { |
| 2150 | dVAR; |
| 2151 | CHECKPOINT lastcp; |
| 2152 | regexp *prog = reginfo->prog; |
| 2153 | RXi_GET_DECL(prog,progi); |
| 2154 | GET_RE_DEBUG_FLAGS_DECL; |
| 2155 | reginfo->cutpoint=NULL; |
| 2156 | |
| 2157 | if ((prog->extflags & RXf_EVAL_SEEN) && !PL_reg_eval_set) { |
| 2158 | MAGIC *mg; |
| 2159 | |
| 2160 | PL_reg_eval_set = RS_init; |
| 2161 | DEBUG_EXECUTE_r(DEBUG_s( |
| 2162 | PerlIO_printf(Perl_debug_log, " setting stack tmpbase at %"IVdf"\n", |
| 2163 | (IV)(PL_stack_sp - PL_stack_base)); |
| 2164 | )); |
| 2165 | SAVESTACK_CXPOS(); |
| 2166 | cxstack[cxstack_ix].blk_oldsp = PL_stack_sp - PL_stack_base; |
| 2167 | /* Otherwise OP_NEXTSTATE will free whatever on stack now. */ |
| 2168 | SAVETMPS; |
| 2169 | /* Apparently this is not needed, judging by wantarray. */ |
| 2170 | /* SAVEI8(cxstack[cxstack_ix].blk_gimme); |
| 2171 | cxstack[cxstack_ix].blk_gimme = G_SCALAR; */ |
| 2172 | |
| 2173 | if (reginfo->sv) { |
| 2174 | /* Make $_ available to executed code. */ |
| 2175 | if (reginfo->sv != DEFSV) { |
| 2176 | SAVE_DEFSV; |
| 2177 | DEFSV = reginfo->sv; |
| 2178 | } |
| 2179 | |
| 2180 | if (!(SvTYPE(reginfo->sv) >= SVt_PVMG && SvMAGIC(reginfo->sv) |
| 2181 | && (mg = mg_find(reginfo->sv, PERL_MAGIC_regex_global)))) { |
| 2182 | /* prepare for quick setting of pos */ |
| 2183 | #ifdef PERL_OLD_COPY_ON_WRITE |
| 2184 | if (SvIsCOW(reginfo->sv)) |
| 2185 | sv_force_normal_flags(reginfo->sv, 0); |
| 2186 | #endif |
| 2187 | mg = sv_magicext(reginfo->sv, NULL, PERL_MAGIC_regex_global, |
| 2188 | &PL_vtbl_mglob, NULL, 0); |
| 2189 | mg->mg_len = -1; |
| 2190 | } |
| 2191 | PL_reg_magic = mg; |
| 2192 | PL_reg_oldpos = mg->mg_len; |
| 2193 | SAVEDESTRUCTOR_X(restore_pos, prog); |
| 2194 | } |
| 2195 | if (!PL_reg_curpm) { |
| 2196 | Newxz(PL_reg_curpm, 1, PMOP); |
| 2197 | #ifdef USE_ITHREADS |
| 2198 | { |
| 2199 | SV* const repointer = newSViv(0); |
| 2200 | /* so we know which PL_regex_padav element is PL_reg_curpm */ |
| 2201 | SvFLAGS(repointer) |= SVf_BREAK; |
| 2202 | av_push(PL_regex_padav,repointer); |
| 2203 | PL_reg_curpm->op_pmoffset = av_len(PL_regex_padav); |
| 2204 | PL_regex_pad = AvARRAY(PL_regex_padav); |
| 2205 | } |
| 2206 | #endif |
| 2207 | } |
| 2208 | PM_SETRE(PL_reg_curpm, prog); |
| 2209 | PL_reg_oldcurpm = PL_curpm; |
| 2210 | PL_curpm = PL_reg_curpm; |
| 2211 | if (RX_MATCH_COPIED(prog)) { |
| 2212 | /* Here is a serious problem: we cannot rewrite subbeg, |
| 2213 | since it may be needed if this match fails. Thus |
| 2214 | $` inside (?{}) could fail... */ |
| 2215 | PL_reg_oldsaved = prog->subbeg; |
| 2216 | PL_reg_oldsavedlen = prog->sublen; |
| 2217 | #ifdef PERL_OLD_COPY_ON_WRITE |
| 2218 | PL_nrs = prog->saved_copy; |
| 2219 | #endif |
| 2220 | RX_MATCH_COPIED_off(prog); |
| 2221 | } |
| 2222 | else |
| 2223 | PL_reg_oldsaved = NULL; |
| 2224 | prog->subbeg = PL_bostr; |
| 2225 | prog->sublen = PL_regeol - PL_bostr; /* strend may have been modified */ |
| 2226 | } |
| 2227 | DEBUG_EXECUTE_r(PL_reg_starttry = *startpos); |
| 2228 | prog->startp[0] = *startpos - PL_bostr; |
| 2229 | PL_reginput = *startpos; |
| 2230 | PL_reglastparen = &prog->lastparen; |
| 2231 | PL_reglastcloseparen = &prog->lastcloseparen; |
| 2232 | prog->lastparen = 0; |
| 2233 | prog->lastcloseparen = 0; |
| 2234 | PL_regsize = 0; |
| 2235 | PL_regstartp = prog->startp; |
| 2236 | PL_regendp = prog->endp; |
| 2237 | if (PL_reg_start_tmpl <= prog->nparens) { |
| 2238 | PL_reg_start_tmpl = prog->nparens*3/2 + 3; |
| 2239 | if(PL_reg_start_tmp) |
| 2240 | Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*); |
| 2241 | else |
| 2242 | Newx(PL_reg_start_tmp, PL_reg_start_tmpl, char*); |
| 2243 | } |
| 2244 | |
| 2245 | /* XXXX What this code is doing here?!!! There should be no need |
| 2246 | to do this again and again, PL_reglastparen should take care of |
| 2247 | this! --ilya*/ |
| 2248 | |
| 2249 | /* Tests pat.t#187 and split.t#{13,14} seem to depend on this code. |
| 2250 | * Actually, the code in regcppop() (which Ilya may be meaning by |
| 2251 | * PL_reglastparen), is not needed at all by the test suite |
| 2252 | * (op/regexp, op/pat, op/split), but that code is needed, oddly |
| 2253 | * enough, for building DynaLoader, or otherwise this |
| 2254 | * "Error: '*' not in typemap in DynaLoader.xs, line 164" |
| 2255 | * will happen. Meanwhile, this code *is* needed for the |
| 2256 | * above-mentioned test suite tests to succeed. The common theme |
| 2257 | * on those tests seems to be returning null fields from matches. |
| 2258 | * --jhi */ |
| 2259 | #if 1 |
| 2260 | if (prog->nparens) { |
| 2261 | I32 *sp = PL_regstartp; |
| 2262 | I32 *ep = PL_regendp; |
| 2263 | register I32 i; |
| 2264 | for (i = prog->nparens; i > (I32)*PL_reglastparen; i--) { |
| 2265 | *++sp = -1; |
| 2266 | *++ep = -1; |
| 2267 | } |
| 2268 | } |
| 2269 | #endif |
| 2270 | REGCP_SET(lastcp); |
| 2271 | if (regmatch(reginfo, progi->program + 1)) { |
| 2272 | PL_regendp[0] = PL_reginput - PL_bostr; |
| 2273 | return 1; |
| 2274 | } |
| 2275 | if (reginfo->cutpoint) |
| 2276 | *startpos= reginfo->cutpoint; |
| 2277 | REGCP_UNWIND(lastcp); |
| 2278 | return 0; |
| 2279 | } |
| 2280 | |
| 2281 | |
| 2282 | #define sayYES goto yes |
| 2283 | #define sayNO goto no |
| 2284 | #define sayNO_SILENT goto no_silent |
| 2285 | |
| 2286 | /* we dont use STMT_START/END here because it leads to |
| 2287 | "unreachable code" warnings, which are bogus, but distracting. */ |
| 2288 | #define CACHEsayNO \ |
| 2289 | if (ST.cache_mask) \ |
| 2290 | PL_reg_poscache[ST.cache_offset] |= ST.cache_mask; \ |
| 2291 | sayNO |
| 2292 | |
| 2293 | /* this is used to determine how far from the left messages like |
| 2294 | 'failed...' are printed. It should be set such that messages |
| 2295 | are inline with the regop output that created them. |
| 2296 | */ |
| 2297 | #define REPORT_CODE_OFF 32 |
| 2298 | |
| 2299 | |
| 2300 | /* Make sure there is a test for this +1 options in re_tests */ |
| 2301 | #define TRIE_INITAL_ACCEPT_BUFFLEN 4; |
| 2302 | |
| 2303 | #define CHRTEST_UNINIT -1001 /* c1/c2 haven't been calculated yet */ |
| 2304 | #define CHRTEST_VOID -1000 /* the c1/c2 "next char" test should be skipped */ |
| 2305 | |
| 2306 | #define SLAB_FIRST(s) (&(s)->states[0]) |
| 2307 | #define SLAB_LAST(s) (&(s)->states[PERL_REGMATCH_SLAB_SLOTS-1]) |
| 2308 | |
| 2309 | /* grab a new slab and return the first slot in it */ |
| 2310 | |
| 2311 | STATIC regmatch_state * |
| 2312 | S_push_slab(pTHX) |
| 2313 | { |
| 2314 | #if PERL_VERSION < 9 && !defined(PERL_CORE) |
| 2315 | dMY_CXT; |
| 2316 | #endif |
| 2317 | regmatch_slab *s = PL_regmatch_slab->next; |
| 2318 | if (!s) { |
| 2319 | Newx(s, 1, regmatch_slab); |
| 2320 | s->prev = PL_regmatch_slab; |
| 2321 | s->next = NULL; |
| 2322 | PL_regmatch_slab->next = s; |
| 2323 | } |
| 2324 | PL_regmatch_slab = s; |
| 2325 | return SLAB_FIRST(s); |
| 2326 | } |
| 2327 | |
| 2328 | |
| 2329 | /* push a new state then goto it */ |
| 2330 | |
| 2331 | #define PUSH_STATE_GOTO(state, node) \ |
| 2332 | scan = node; \ |
| 2333 | st->resume_state = state; \ |
| 2334 | goto push_state; |
| 2335 | |
| 2336 | /* push a new state with success backtracking, then goto it */ |
| 2337 | |
| 2338 | #define PUSH_YES_STATE_GOTO(state, node) \ |
| 2339 | scan = node; \ |
| 2340 | st->resume_state = state; \ |
| 2341 | goto push_yes_state; |
| 2342 | |
| 2343 | |
| 2344 | |
| 2345 | /* |
| 2346 | |
| 2347 | regmatch() - main matching routine |
| 2348 | |
| 2349 | This is basically one big switch statement in a loop. We execute an op, |
| 2350 | set 'next' to point the next op, and continue. If we come to a point which |
| 2351 | we may need to backtrack to on failure such as (A|B|C), we push a |
| 2352 | backtrack state onto the backtrack stack. On failure, we pop the top |
| 2353 | state, and re-enter the loop at the state indicated. If there are no more |
| 2354 | states to pop, we return failure. |
| 2355 | |
| 2356 | Sometimes we also need to backtrack on success; for example /A+/, where |
| 2357 | after successfully matching one A, we need to go back and try to |
| 2358 | match another one; similarly for lookahead assertions: if the assertion |
| 2359 | completes successfully, we backtrack to the state just before the assertion |
| 2360 | and then carry on. In these cases, the pushed state is marked as |
| 2361 | 'backtrack on success too'. This marking is in fact done by a chain of |
| 2362 | pointers, each pointing to the previous 'yes' state. On success, we pop to |
| 2363 | the nearest yes state, discarding any intermediate failure-only states. |
| 2364 | Sometimes a yes state is pushed just to force some cleanup code to be |
| 2365 | called at the end of a successful match or submatch; e.g. (??{$re}) uses |
| 2366 | it to free the inner regex. |
| 2367 | |
| 2368 | Note that failure backtracking rewinds the cursor position, while |
| 2369 | success backtracking leaves it alone. |
| 2370 | |
| 2371 | A pattern is complete when the END op is executed, while a subpattern |
| 2372 | such as (?=foo) is complete when the SUCCESS op is executed. Both of these |
| 2373 | ops trigger the "pop to last yes state if any, otherwise return true" |
| 2374 | behaviour. |
| 2375 | |
| 2376 | A common convention in this function is to use A and B to refer to the two |
| 2377 | subpatterns (or to the first nodes thereof) in patterns like /A*B/: so A is |
| 2378 | the subpattern to be matched possibly multiple times, while B is the entire |
| 2379 | rest of the pattern. Variable and state names reflect this convention. |
| 2380 | |
| 2381 | The states in the main switch are the union of ops and failure/success of |
| 2382 | substates associated with with that op. For example, IFMATCH is the op |
| 2383 | that does lookahead assertions /(?=A)B/ and so the IFMATCH state means |
| 2384 | 'execute IFMATCH'; while IFMATCH_A is a state saying that we have just |
| 2385 | successfully matched A and IFMATCH_A_fail is a state saying that we have |
| 2386 | just failed to match A. Resume states always come in pairs. The backtrack |
| 2387 | state we push is marked as 'IFMATCH_A', but when that is popped, we resume |
| 2388 | at IFMATCH_A or IFMATCH_A_fail, depending on whether we are backtracking |
| 2389 | on success or failure. |
| 2390 | |
| 2391 | The struct that holds a backtracking state is actually a big union, with |
| 2392 | one variant for each major type of op. The variable st points to the |
| 2393 | top-most backtrack struct. To make the code clearer, within each |
| 2394 | block of code we #define ST to alias the relevant union. |
| 2395 | |
| 2396 | Here's a concrete example of a (vastly oversimplified) IFMATCH |
| 2397 | implementation: |
| 2398 | |
| 2399 | switch (state) { |
| 2400 | .... |
| 2401 | |
| 2402 | #define ST st->u.ifmatch |
| 2403 | |
| 2404 | case IFMATCH: // we are executing the IFMATCH op, (?=A)B |
| 2405 | ST.foo = ...; // some state we wish to save |
| 2406 | ... |
| 2407 | // push a yes backtrack state with a resume value of |
| 2408 | // IFMATCH_A/IFMATCH_A_fail, then continue execution at the |
| 2409 | // first node of A: |
| 2410 | PUSH_YES_STATE_GOTO(IFMATCH_A, A); |
| 2411 | // NOTREACHED |
| 2412 | |
| 2413 | case IFMATCH_A: // we have successfully executed A; now continue with B |
| 2414 | next = B; |
| 2415 | bar = ST.foo; // do something with the preserved value |
| 2416 | break; |
| 2417 | |
| 2418 | case IFMATCH_A_fail: // A failed, so the assertion failed |
| 2419 | ...; // do some housekeeping, then ... |
| 2420 | sayNO; // propagate the failure |
| 2421 | |
| 2422 | #undef ST |
| 2423 | |
| 2424 | ... |
| 2425 | } |
| 2426 | |
| 2427 | For any old-timers reading this who are familiar with the old recursive |
| 2428 | approach, the code above is equivalent to: |
| 2429 | |
| 2430 | case IFMATCH: // we are executing the IFMATCH op, (?=A)B |
| 2431 | { |
| 2432 | int foo = ... |
| 2433 | ... |
| 2434 | if (regmatch(A)) { |
| 2435 | next = B; |
| 2436 | bar = foo; |
| 2437 | break; |
| 2438 | } |
| 2439 | ...; // do some housekeeping, then ... |
| 2440 | sayNO; // propagate the failure |
| 2441 | } |
| 2442 | |
| 2443 | The topmost backtrack state, pointed to by st, is usually free. If you |
| 2444 | want to claim it, populate any ST.foo fields in it with values you wish to |
| 2445 | save, then do one of |
| 2446 | |
| 2447 | PUSH_STATE_GOTO(resume_state, node); |
| 2448 | PUSH_YES_STATE_GOTO(resume_state, node); |
| 2449 | |
| 2450 | which sets that backtrack state's resume value to 'resume_state', pushes a |
| 2451 | new free entry to the top of the backtrack stack, then goes to 'node'. |
| 2452 | On backtracking, the free slot is popped, and the saved state becomes the |
| 2453 | new free state. An ST.foo field in this new top state can be temporarily |
| 2454 | accessed to retrieve values, but once the main loop is re-entered, it |
| 2455 | becomes available for reuse. |
| 2456 | |
| 2457 | Note that the depth of the backtrack stack constantly increases during the |
| 2458 | left-to-right execution of the pattern, rather than going up and down with |
| 2459 | the pattern nesting. For example the stack is at its maximum at Z at the |
| 2460 | end of the pattern, rather than at X in the following: |
| 2461 | |
| 2462 | /(((X)+)+)+....(Y)+....Z/ |
| 2463 | |
| 2464 | The only exceptions to this are lookahead/behind assertions and the cut, |
| 2465 | (?>A), which pop all the backtrack states associated with A before |
| 2466 | continuing. |
| 2467 | |
| 2468 | Bascktrack state structs are allocated in slabs of about 4K in size. |
| 2469 | PL_regmatch_state and st always point to the currently active state, |
| 2470 | and PL_regmatch_slab points to the slab currently containing |
| 2471 | PL_regmatch_state. The first time regmatch() is called, the first slab is |
| 2472 | allocated, and is never freed until interpreter destruction. When the slab |
| 2473 | is full, a new one is allocated and chained to the end. At exit from |
| 2474 | regmatch(), slabs allocated since entry are freed. |
| 2475 | |
| 2476 | */ |
| 2477 | |
| 2478 | |
| 2479 | #define DEBUG_STATE_pp(pp) \ |
| 2480 | DEBUG_STATE_r({ \ |
| 2481 | DUMP_EXEC_POS(locinput, scan, do_utf8); \ |
| 2482 | PerlIO_printf(Perl_debug_log, \ |
| 2483 | " %*s"pp" %s%s%s%s%s\n", \ |
| 2484 | depth*2, "", \ |
| 2485 | PL_reg_name[st->resume_state], \ |
| 2486 | ((st==yes_state||st==mark_state) ? "[" : ""), \ |
| 2487 | ((st==yes_state) ? "Y" : ""), \ |
| 2488 | ((st==mark_state) ? "M" : ""), \ |
| 2489 | ((st==yes_state||st==mark_state) ? "]" : "") \ |
| 2490 | ); \ |
| 2491 | }); |
| 2492 | |
| 2493 | |
| 2494 | #define REG_NODE_NUM(x) ((x) ? (int)((x)-prog) : -1) |
| 2495 | |
| 2496 | #ifdef DEBUGGING |
| 2497 | |
| 2498 | STATIC void |
| 2499 | S_debug_start_match(pTHX_ const regexp *prog, const bool do_utf8, |
| 2500 | const char *start, const char *end, const char *blurb) |
| 2501 | { |
| 2502 | const bool utf8_pat= prog->extflags & RXf_UTF8 ? 1 : 0; |
| 2503 | if (!PL_colorset) |
| 2504 | reginitcolors(); |
| 2505 | { |
| 2506 | RE_PV_QUOTED_DECL(s0, utf8_pat, PERL_DEBUG_PAD_ZERO(0), |
| 2507 | prog->precomp, prog->prelen, 60); |
| 2508 | |
| 2509 | RE_PV_QUOTED_DECL(s1, do_utf8, PERL_DEBUG_PAD_ZERO(1), |
| 2510 | start, end - start, 60); |
| 2511 | |
| 2512 | PerlIO_printf(Perl_debug_log, |
| 2513 | "%s%s REx%s %s against %s\n", |
| 2514 | PL_colors[4], blurb, PL_colors[5], s0, s1); |
| 2515 | |
| 2516 | if (do_utf8||utf8_pat) |
| 2517 | PerlIO_printf(Perl_debug_log, "UTF-8 %s%s%s...\n", |
| 2518 | utf8_pat ? "pattern" : "", |
| 2519 | utf8_pat && do_utf8 ? " and " : "", |
| 2520 | do_utf8 ? "string" : "" |
| 2521 | ); |
| 2522 | } |
| 2523 | } |
| 2524 | |
| 2525 | STATIC void |
| 2526 | S_dump_exec_pos(pTHX_ const char *locinput, |
| 2527 | const regnode *scan, |
| 2528 | const char *loc_regeol, |
| 2529 | const char *loc_bostr, |
| 2530 | const char *loc_reg_starttry, |
| 2531 | const bool do_utf8) |
| 2532 | { |
| 2533 | const int docolor = *PL_colors[0] || *PL_colors[2] || *PL_colors[4]; |
| 2534 | const int taill = (docolor ? 10 : 7); /* 3 chars for "> <" */ |
| 2535 | int l = (loc_regeol - locinput) > taill ? taill : (loc_regeol - locinput); |
| 2536 | /* The part of the string before starttry has one color |
| 2537 | (pref0_len chars), between starttry and current |
| 2538 | position another one (pref_len - pref0_len chars), |
| 2539 | after the current position the third one. |
| 2540 | We assume that pref0_len <= pref_len, otherwise we |
| 2541 | decrease pref0_len. */ |
| 2542 | int pref_len = (locinput - loc_bostr) > (5 + taill) - l |
| 2543 | ? (5 + taill) - l : locinput - loc_bostr; |
| 2544 | int pref0_len; |
| 2545 | |
| 2546 | while (do_utf8 && UTF8_IS_CONTINUATION(*(U8*)(locinput - pref_len))) |
| 2547 | pref_len++; |
| 2548 | pref0_len = pref_len - (locinput - loc_reg_starttry); |
| 2549 | if (l + pref_len < (5 + taill) && l < loc_regeol - locinput) |
| 2550 | l = ( loc_regeol - locinput > (5 + taill) - pref_len |
| 2551 | ? (5 + taill) - pref_len : loc_regeol - locinput); |
| 2552 | while (do_utf8 && UTF8_IS_CONTINUATION(*(U8*)(locinput + l))) |
| 2553 | l--; |
| 2554 | if (pref0_len < 0) |
| 2555 | pref0_len = 0; |
| 2556 | if (pref0_len > pref_len) |
| 2557 | pref0_len = pref_len; |
| 2558 | { |
| 2559 | const int is_uni = (do_utf8 && OP(scan) != CANY) ? 1 : 0; |
| 2560 | |
| 2561 | RE_PV_COLOR_DECL(s0,len0,is_uni,PERL_DEBUG_PAD(0), |
| 2562 | (locinput - pref_len),pref0_len, 60, 4, 5); |
| 2563 | |
| 2564 | RE_PV_COLOR_DECL(s1,len1,is_uni,PERL_DEBUG_PAD(1), |
| 2565 | (locinput - pref_len + pref0_len), |
| 2566 | pref_len - pref0_len, 60, 2, 3); |
| 2567 | |
| 2568 | RE_PV_COLOR_DECL(s2,len2,is_uni,PERL_DEBUG_PAD(2), |
| 2569 | locinput, loc_regeol - locinput, 10, 0, 1); |
| 2570 | |
| 2571 | const STRLEN tlen=len0+len1+len2; |
| 2572 | PerlIO_printf(Perl_debug_log, |
| 2573 | "%4"IVdf" <%.*s%.*s%s%.*s>%*s|", |
| 2574 | (IV)(locinput - loc_bostr), |
| 2575 | len0, s0, |
| 2576 | len1, s1, |
| 2577 | (docolor ? "" : "> <"), |
| 2578 | len2, s2, |
| 2579 | (int)(tlen > 19 ? 0 : 19 - tlen), |
| 2580 | ""); |
| 2581 | } |
| 2582 | } |
| 2583 | |
| 2584 | #endif |
| 2585 | |
| 2586 | /* reg_check_named_buff_matched() |
| 2587 | * Checks to see if a named buffer has matched. The data array of |
| 2588 | * buffer numbers corresponding to the buffer is expected to reside |
| 2589 | * in the regexp->data->data array in the slot stored in the ARG() of |
| 2590 | * node involved. Note that this routine doesn't actually care about the |
| 2591 | * name, that information is not preserved from compilation to execution. |
| 2592 | * Returns the index of the leftmost defined buffer with the given name |
| 2593 | * or 0 if non of the buffers matched. |
| 2594 | */ |
| 2595 | STATIC I32 |
| 2596 | S_reg_check_named_buff_matched(pTHX_ const regexp *rex, const regnode *scan) { |
| 2597 | I32 n; |
| 2598 | RXi_GET_DECL(rex,rexi); |
| 2599 | SV *sv_dat=(SV*)rexi->data->data[ ARG( scan ) ]; |
| 2600 | I32 *nums=(I32*)SvPVX(sv_dat); |
| 2601 | for ( n=0; n<SvIVX(sv_dat); n++ ) { |
| 2602 | if ((I32)*PL_reglastparen >= nums[n] && |
| 2603 | PL_regendp[nums[n]] != -1) |
| 2604 | { |
| 2605 | return nums[n]; |
| 2606 | } |
| 2607 | } |
| 2608 | return 0; |
| 2609 | } |
| 2610 | |
| 2611 | #define SETREX(Re1,Re2) \ |
| 2612 | if (PL_reg_eval_set) PM_SETRE((PL_reg_curpm), (Re2)); \ |
| 2613 | Re1 = (Re2) |
| 2614 | |
| 2615 | STATIC I32 /* 0 failure, 1 success */ |
| 2616 | S_regmatch(pTHX_ regmatch_info *reginfo, regnode *prog) |
| 2617 | { |
| 2618 | #if PERL_VERSION < 9 && !defined(PERL_CORE) |
| 2619 | dMY_CXT; |
| 2620 | #endif |
| 2621 | dVAR; |
| 2622 | register const bool do_utf8 = PL_reg_match_utf8; |
| 2623 | const U32 uniflags = UTF8_ALLOW_DEFAULT; |
| 2624 | |
| 2625 | regexp *rex = reginfo->prog; |
| 2626 | RXi_GET_DECL(rex,rexi); |
| 2627 | |
| 2628 | regmatch_slab *orig_slab; |
| 2629 | regmatch_state *orig_state; |
| 2630 | |
| 2631 | /* the current state. This is a cached copy of PL_regmatch_state */ |
| 2632 | register regmatch_state *st; |
| 2633 | |
| 2634 | /* cache heavy used fields of st in registers */ |
| 2635 | register regnode *scan; |
| 2636 | register regnode *next; |
| 2637 | register U32 n = 0; /* general value; init to avoid compiler warning */ |
| 2638 | register I32 ln = 0; /* len or last; init to avoid compiler warning */ |
| 2639 | register char *locinput = PL_reginput; |
| 2640 | register I32 nextchr; /* is always set to UCHARAT(locinput) */ |
| 2641 | |
| 2642 | bool result = 0; /* return value of S_regmatch */ |
| 2643 | int depth = 0; /* depth of backtrack stack */ |
| 2644 | U32 nochange_depth = 0; /* depth of GOSUB recursion with nochange */ |
| 2645 | const U32 max_nochange_depth = |
| 2646 | (3 * rex->nparens > MAX_RECURSE_EVAL_NOCHANGE_DEPTH) ? |
| 2647 | 3 * rex->nparens : MAX_RECURSE_EVAL_NOCHANGE_DEPTH; |
| 2648 | |
| 2649 | regmatch_state *yes_state = NULL; /* state to pop to on success of |
| 2650 | subpattern */ |
| 2651 | /* mark_state piggy backs on the yes_state logic so that when we unwind |
| 2652 | the stack on success we can update the mark_state as we go */ |
| 2653 | regmatch_state *mark_state = NULL; /* last mark state we have seen */ |
| 2654 | |
| 2655 | regmatch_state *cur_eval = NULL; /* most recent EVAL_AB state */ |
| 2656 | struct regmatch_state *cur_curlyx = NULL; /* most recent curlyx */ |
| 2657 | U32 state_num; |
| 2658 | bool no_final = 0; /* prevent failure from backtracking? */ |
| 2659 | bool do_cutgroup = 0; /* no_final only until next branch/trie entry */ |
| 2660 | char *startpoint = PL_reginput; |
| 2661 | SV *popmark = NULL; /* are we looking for a mark? */ |
| 2662 | SV *sv_commit = NULL; /* last mark name seen in failure */ |
| 2663 | SV *sv_yes_mark = NULL; /* last mark name we have seen |
| 2664 | during a successfull match */ |
| 2665 | U32 lastopen = 0; /* last open we saw */ |
| 2666 | bool has_cutgroup = RX_HAS_CUTGROUP(rex) ? 1 : 0; |
| 2667 | |
| 2668 | |
| 2669 | /* these three flags are set by various ops to signal information to |
| 2670 | * the very next op. They have a useful lifetime of exactly one loop |
| 2671 | * iteration, and are not preserved or restored by state pushes/pops |
| 2672 | */ |
| 2673 | bool sw = 0; /* the condition value in (?(cond)a|b) */ |
| 2674 | bool minmod = 0; /* the next "{n,m}" is a "{n,m}?" */ |
| 2675 | int logical = 0; /* the following EVAL is: |
| 2676 | 0: (?{...}) |
| 2677 | 1: (?(?{...})X|Y) |
| 2678 | 2: (??{...}) |
| 2679 | or the following IFMATCH/UNLESSM is: |
| 2680 | false: plain (?=foo) |
| 2681 | true: used as a condition: (?(?=foo)) |
| 2682 | */ |
| 2683 | |
| 2684 | #ifdef DEBUGGING |
| 2685 | GET_RE_DEBUG_FLAGS_DECL; |
| 2686 | #endif |
| 2687 | |
| 2688 | DEBUG_OPTIMISE_r( DEBUG_EXECUTE_r({ |
| 2689 | PerlIO_printf(Perl_debug_log,"regmatch start\n"); |
| 2690 | })); |
| 2691 | /* on first ever call to regmatch, allocate first slab */ |
| 2692 | if (!PL_regmatch_slab) { |
| 2693 | Newx(PL_regmatch_slab, 1, regmatch_slab); |
| 2694 | PL_regmatch_slab->prev = NULL; |
| 2695 | PL_regmatch_slab->next = NULL; |
| 2696 | PL_regmatch_state = SLAB_FIRST(PL_regmatch_slab); |
| 2697 | } |
| 2698 | |
| 2699 | /* remember current high-water mark for exit */ |
| 2700 | /* XXX this should be done with SAVE* instead */ |
| 2701 | orig_slab = PL_regmatch_slab; |
| 2702 | orig_state = PL_regmatch_state; |
| 2703 | |
| 2704 | /* grab next free state slot */ |
| 2705 | st = ++PL_regmatch_state; |
| 2706 | if (st > SLAB_LAST(PL_regmatch_slab)) |
| 2707 | st = PL_regmatch_state = S_push_slab(aTHX); |
| 2708 | |
| 2709 | /* Note that nextchr is a byte even in UTF */ |
| 2710 | nextchr = UCHARAT(locinput); |
| 2711 | scan = prog; |
| 2712 | while (scan != NULL) { |
| 2713 | |
| 2714 | DEBUG_EXECUTE_r( { |
| 2715 | SV * const prop = sv_newmortal(); |
| 2716 | regnode *rnext=regnext(scan); |
| 2717 | DUMP_EXEC_POS( locinput, scan, do_utf8 ); |
| 2718 | regprop(rex, prop, scan); |
| 2719 | |
| 2720 | PerlIO_printf(Perl_debug_log, |
| 2721 | "%3"IVdf":%*s%s(%"IVdf")\n", |
| 2722 | (IV)(scan - rexi->program), depth*2, "", |
| 2723 | SvPVX_const(prop), |
| 2724 | (PL_regkind[OP(scan)] == END || !rnext) ? |
| 2725 | 0 : (IV)(rnext - rexi->program)); |
| 2726 | }); |
| 2727 | |
| 2728 | next = scan + NEXT_OFF(scan); |
| 2729 | if (next == scan) |
| 2730 | next = NULL; |
| 2731 | state_num = OP(scan); |
| 2732 | |
| 2733 | reenter_switch: |
| 2734 | switch (state_num) { |
| 2735 | case BOL: |
| 2736 | if (locinput == PL_bostr) |
| 2737 | { |
| 2738 | /* reginfo->till = reginfo->bol; */ |
| 2739 | break; |
| 2740 | } |
| 2741 | sayNO; |
| 2742 | case MBOL: |
| 2743 | if (locinput == PL_bostr || |
| 2744 | ((nextchr || locinput < PL_regeol) && locinput[-1] == '\n')) |
| 2745 | { |
| 2746 | break; |
| 2747 | } |
| 2748 | sayNO; |
| 2749 | case SBOL: |
| 2750 | if (locinput == PL_bostr) |
| 2751 | break; |
| 2752 | sayNO; |
| 2753 | case GPOS: |
| 2754 | if (locinput == reginfo->ganch) |
| 2755 | break; |
| 2756 | sayNO; |
| 2757 | |
| 2758 | case KEEPS: |
| 2759 | /* update the startpoint */ |
| 2760 | st->u.keeper.val = PL_regstartp[0]; |
| 2761 | PL_reginput = locinput; |
| 2762 | PL_regstartp[0] = locinput - PL_bostr; |
| 2763 | PUSH_STATE_GOTO(KEEPS_next, next); |
| 2764 | /*NOT-REACHED*/ |
| 2765 | case KEEPS_next_fail: |
| 2766 | /* rollback the start point change */ |
| 2767 | PL_regstartp[0] = st->u.keeper.val; |
| 2768 | sayNO_SILENT; |
| 2769 | /*NOT-REACHED*/ |
| 2770 | case EOL: |
| 2771 | goto seol; |
| 2772 | case MEOL: |
| 2773 | if ((nextchr || locinput < PL_regeol) && nextchr != '\n') |
| 2774 | sayNO; |
| 2775 | break; |
| 2776 | case SEOL: |
| 2777 | seol: |
| 2778 | if ((nextchr || locinput < PL_regeol) && nextchr != '\n') |
| 2779 | sayNO; |
| 2780 | if (PL_regeol - locinput > 1) |
| 2781 | sayNO; |
| 2782 | break; |
| 2783 | case EOS: |
| 2784 | if (PL_regeol != locinput) |
| 2785 | sayNO; |
| 2786 | break; |
| 2787 | case SANY: |
| 2788 | if (!nextchr && locinput >= PL_regeol) |
| 2789 | sayNO; |
| 2790 | if (do_utf8) { |
| 2791 | locinput += PL_utf8skip[nextchr]; |
| 2792 | if (locinput > PL_regeol) |
| 2793 | sayNO; |
| 2794 | nextchr = UCHARAT(locinput); |
| 2795 | } |
| 2796 | else |
| 2797 | nextchr = UCHARAT(++locinput); |
| 2798 | break; |
| 2799 | case CANY: |
| 2800 | if (!nextchr && locinput >= PL_regeol) |
| 2801 | sayNO; |
| 2802 | nextchr = UCHARAT(++locinput); |
| 2803 | break; |
| 2804 | case REG_ANY: |
| 2805 | if ((!nextchr && locinput >= PL_regeol) || nextchr == '\n') |
| 2806 | sayNO; |
| 2807 | if (do_utf8) { |
| 2808 | locinput += PL_utf8skip[nextchr]; |
| 2809 | if (locinput > PL_regeol) |
| 2810 | sayNO; |
| 2811 | nextchr = UCHARAT(locinput); |
| 2812 | } |
| 2813 | else |
| 2814 | nextchr = UCHARAT(++locinput); |
| 2815 | break; |
| 2816 | |
| 2817 | #undef ST |
| 2818 | #define ST st->u.trie |
| 2819 | case TRIEC: |
| 2820 | /* In this case the charclass data is available inline so |
| 2821 | we can fail fast without a lot of extra overhead. |
| 2822 | */ |
| 2823 | if (scan->flags == EXACT || !do_utf8) { |
| 2824 | if(!ANYOF_BITMAP_TEST(scan, *locinput)) { |
| 2825 | DEBUG_EXECUTE_r( |
| 2826 | PerlIO_printf(Perl_debug_log, |
| 2827 | "%*s %sfailed to match trie start class...%s\n", |
| 2828 | REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5]) |
| 2829 | ); |
| 2830 | sayNO_SILENT; |
| 2831 | /* NOTREACHED */ |
| 2832 | } |
| 2833 | } |
| 2834 | /* FALL THROUGH */ |
| 2835 | case TRIE: |
| 2836 | { |
| 2837 | /* what type of TRIE am I? (utf8 makes this contextual) */ |
| 2838 | const enum { trie_plain, trie_utf8, trie_utf8_fold } |
| 2839 | trie_type = do_utf8 ? |
| 2840 | (scan->flags == EXACT ? trie_utf8 : trie_utf8_fold) |
| 2841 | : trie_plain; |
| 2842 | |
| 2843 | /* what trie are we using right now */ |
| 2844 | reg_trie_data * const trie |
| 2845 | = (reg_trie_data*)rexi->data->data[ ARG( scan ) ]; |
| 2846 | HV * widecharmap = (HV *)rexi->data->data[ ARG( scan ) + 1 ]; |
| 2847 | U32 state = trie->startstate; |
| 2848 | |
| 2849 | if (trie->bitmap && trie_type != trie_utf8_fold && |
| 2850 | !TRIE_BITMAP_TEST(trie,*locinput) |
| 2851 | ) { |
| 2852 | if (trie->states[ state ].wordnum) { |
| 2853 | DEBUG_EXECUTE_r( |
| 2854 | PerlIO_printf(Perl_debug_log, |
| 2855 | "%*s %smatched empty string...%s\n", |
| 2856 | REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5]) |
| 2857 | ); |
| 2858 | break; |
| 2859 | } else { |
| 2860 | DEBUG_EXECUTE_r( |
| 2861 | PerlIO_printf(Perl_debug_log, |
| 2862 | "%*s %sfailed to match trie start class...%s\n", |
| 2863 | REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5]) |
| 2864 | ); |
| 2865 | sayNO_SILENT; |
| 2866 | } |
| 2867 | } |
| 2868 | |
| 2869 | { |
| 2870 | U8 *uc = ( U8* )locinput; |
| 2871 | |
| 2872 | STRLEN len = 0; |
| 2873 | STRLEN foldlen = 0; |
| 2874 | U8 *uscan = (U8*)NULL; |
| 2875 | STRLEN bufflen=0; |
| 2876 | SV *sv_accept_buff = NULL; |
| 2877 | U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ]; |
| 2878 | |
| 2879 | ST.accepted = 0; /* how many accepting states we have seen */ |
| 2880 | ST.B = next; |
| 2881 | ST.jump = trie->jump; |
| 2882 | ST.me = scan; |
| 2883 | /* |
| 2884 | traverse the TRIE keeping track of all accepting states |
| 2885 | we transition through until we get to a failing node. |
| 2886 | */ |
| 2887 | |
| 2888 | while ( state && uc <= (U8*)PL_regeol ) { |
| 2889 | U32 base = trie->states[ state ].trans.base; |
| 2890 | UV uvc = 0; |
| 2891 | U16 charid; |
| 2892 | /* We use charid to hold the wordnum as we don't use it |
| 2893 | for charid until after we have done the wordnum logic. |
| 2894 | We define an alias just so that the wordnum logic reads |
| 2895 | more naturally. */ |
| 2896 | |
| 2897 | #define got_wordnum charid |
| 2898 | got_wordnum = trie->states[ state ].wordnum; |
| 2899 | |
| 2900 | if ( got_wordnum ) { |
| 2901 | if ( ! ST.accepted ) { |
| 2902 | ENTER; |
| 2903 | SAVETMPS; |
| 2904 | bufflen = TRIE_INITAL_ACCEPT_BUFFLEN; |
| 2905 | sv_accept_buff=newSV(bufflen * |
| 2906 | sizeof(reg_trie_accepted) - 1); |
| 2907 | SvCUR_set(sv_accept_buff, 0); |
| 2908 | SvPOK_on(sv_accept_buff); |
| 2909 | sv_2mortal(sv_accept_buff); |
| 2910 | SAVETMPS; |
| 2911 | ST.accept_buff = |
| 2912 | (reg_trie_accepted*)SvPV_nolen(sv_accept_buff ); |
| 2913 | } |
| 2914 | do { |
| 2915 | if (ST.accepted >= bufflen) { |
| 2916 | bufflen *= 2; |
| 2917 | ST.accept_buff =(reg_trie_accepted*) |
| 2918 | SvGROW(sv_accept_buff, |
| 2919 | bufflen * sizeof(reg_trie_accepted)); |
| 2920 | } |
| 2921 | SvCUR_set(sv_accept_buff,SvCUR(sv_accept_buff) |
| 2922 | + sizeof(reg_trie_accepted)); |
| 2923 | |
| 2924 | |
| 2925 | ST.accept_buff[ST.accepted].wordnum = got_wordnum; |
| 2926 | ST.accept_buff[ST.accepted].endpos = uc; |
| 2927 | ++ST.accepted; |
| 2928 | } while (trie->nextword && (got_wordnum= trie->nextword[got_wordnum])); |
| 2929 | } |
| 2930 | #undef got_wordnum |
| 2931 | |
| 2932 | DEBUG_TRIE_EXECUTE_r({ |
| 2933 | DUMP_EXEC_POS( (char *)uc, scan, do_utf8 ); |
| 2934 | PerlIO_printf( Perl_debug_log, |
| 2935 | "%*s %sState: %4"UVxf" Accepted: %4"UVxf" ", |
| 2936 | 2+depth * 2, "", PL_colors[4], |
| 2937 | (UV)state, (UV)ST.accepted ); |
| 2938 | }); |
| 2939 | |
| 2940 | if ( base ) { |
| 2941 | REXEC_TRIE_READ_CHAR(trie_type, trie, widecharmap, uc, |
| 2942 | uscan, len, uvc, charid, foldlen, |
| 2943 | foldbuf, uniflags); |
| 2944 | |
| 2945 | if (charid && |
| 2946 | (base + charid > trie->uniquecharcount ) |
| 2947 | && (base + charid - 1 - trie->uniquecharcount |
| 2948 | < trie->lasttrans) |
| 2949 | && trie->trans[base + charid - 1 - |
| 2950 | trie->uniquecharcount].check == state) |
| 2951 | { |
| 2952 | state = trie->trans[base + charid - 1 - |
| 2953 | trie->uniquecharcount ].next; |
| 2954 | } |
| 2955 | else { |
| 2956 | state = 0; |
| 2957 | } |
| 2958 | uc += len; |
| 2959 | |
| 2960 | } |
| 2961 | else { |
| 2962 | state = 0; |
| 2963 | } |
| 2964 | DEBUG_TRIE_EXECUTE_r( |
| 2965 | PerlIO_printf( Perl_debug_log, |
| 2966 | "Charid:%3x CP:%4"UVxf" After State: %4"UVxf"%s\n", |
| 2967 | charid, uvc, (UV)state, PL_colors[5] ); |
| 2968 | ); |
| 2969 | } |
| 2970 | if (!ST.accepted ) |
| 2971 | sayNO; |
| 2972 | |
| 2973 | DEBUG_EXECUTE_r( |
| 2974 | PerlIO_printf( Perl_debug_log, |
| 2975 | "%*s %sgot %"IVdf" possible matches%s\n", |
| 2976 | REPORT_CODE_OFF + depth * 2, "", |
| 2977 | PL_colors[4], (IV)ST.accepted, PL_colors[5] ); |
| 2978 | ); |
| 2979 | }} |
| 2980 | goto trie_first_try; /* jump into the fail handler */ |
| 2981 | /* NOTREACHED */ |
| 2982 | case TRIE_next_fail: /* we failed - try next alterative */ |
| 2983 | if ( ST.jump) { |
| 2984 | REGCP_UNWIND(ST.cp); |
| 2985 | for (n = *PL_reglastparen; n > ST.lastparen; n--) |
| 2986 | PL_regendp[n] = -1; |
| 2987 | *PL_reglastparen = n; |
| 2988 | } |
| 2989 | trie_first_try: |
| 2990 | if (do_cutgroup) { |
| 2991 | do_cutgroup = 0; |
| 2992 | no_final = 0; |
| 2993 | } |
| 2994 | |
| 2995 | if ( ST.jump) { |
| 2996 | ST.lastparen = *PL_reglastparen; |
| 2997 | REGCP_SET(ST.cp); |
| 2998 | } |
| 2999 | if ( ST.accepted == 1 ) { |
| 3000 | /* only one choice left - just continue */ |
| 3001 | DEBUG_EXECUTE_r({ |
| 3002 | AV *const trie_words |
| 3003 | = (AV *) rexi->data->data[ARG(ST.me)+TRIE_WORDS_OFFSET]; |
| 3004 | SV ** const tmp = av_fetch( trie_words, |
| 3005 | ST.accept_buff[ 0 ].wordnum-1, 0 ); |
| 3006 | SV *sv= tmp ? sv_newmortal() : NULL; |
| 3007 | |
| 3008 | PerlIO_printf( Perl_debug_log, |
| 3009 | "%*s %sonly one match left: #%d <%s>%s\n", |
| 3010 | REPORT_CODE_OFF+depth*2, "", PL_colors[4], |
| 3011 | ST.accept_buff[ 0 ].wordnum, |
| 3012 | tmp ? pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), 0, |
| 3013 | PL_colors[0], PL_colors[1], |
| 3014 | (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
| 3015 | ) |
| 3016 | : "not compiled under -Dr", |
| 3017 | PL_colors[5] ); |
| 3018 | }); |
| 3019 | PL_reginput = (char *)ST.accept_buff[ 0 ].endpos; |
| 3020 | /* in this case we free tmps/leave before we call regmatch |
| 3021 | as we wont be using accept_buff again. */ |
| 3022 | |
| 3023 | locinput = PL_reginput; |
| 3024 | nextchr = UCHARAT(locinput); |
| 3025 | if ( !ST.jump || !ST.jump[ST.accept_buff[0].wordnum]) |
| 3026 | scan = ST.B; |
| 3027 | else |
| 3028 | scan = ST.me + ST.jump[ST.accept_buff[0].wordnum]; |
| 3029 | if (!has_cutgroup) { |
| 3030 | FREETMPS; |
| 3031 | LEAVE; |
| 3032 | } else { |
| 3033 | ST.accepted--; |
| 3034 | PUSH_YES_STATE_GOTO(TRIE_next, scan); |
| 3035 | } |
| 3036 | |
| 3037 | continue; /* execute rest of RE */ |
| 3038 | } |
| 3039 | |
| 3040 | if ( !ST.accepted-- ) { |
| 3041 | DEBUG_EXECUTE_r({ |
| 3042 | PerlIO_printf( Perl_debug_log, |
| 3043 | "%*s %sTRIE failed...%s\n", |
| 3044 | REPORT_CODE_OFF+depth*2, "", |
| 3045 | PL_colors[4], |
| 3046 | PL_colors[5] ); |
| 3047 | }); |
| 3048 | FREETMPS; |
| 3049 | LEAVE; |
| 3050 | sayNO_SILENT; |
| 3051 | /*NOTREACHED*/ |
| 3052 | } |
| 3053 | |
| 3054 | /* |
| 3055 | There are at least two accepting states left. Presumably |
| 3056 | the number of accepting states is going to be low, |
| 3057 | typically two. So we simply scan through to find the one |
| 3058 | with lowest wordnum. Once we find it, we swap the last |
| 3059 | state into its place and decrement the size. We then try to |
| 3060 | match the rest of the pattern at the point where the word |
| 3061 | ends. If we succeed, control just continues along the |
| 3062 | regex; if we fail we return here to try the next accepting |
| 3063 | state |
| 3064 | */ |
| 3065 | |
| 3066 | { |
| 3067 | U32 best = 0; |
| 3068 | U32 cur; |
| 3069 | for( cur = 1 ; cur <= ST.accepted ; cur++ ) { |
| 3070 | DEBUG_TRIE_EXECUTE_r( |
| 3071 | PerlIO_printf( Perl_debug_log, |
| 3072 | "%*s %sgot %"IVdf" (%d) as best, looking at %"IVdf" (%d)%s\n", |
| 3073 | REPORT_CODE_OFF + depth * 2, "", PL_colors[4], |
| 3074 | (IV)best, ST.accept_buff[ best ].wordnum, (IV)cur, |
| 3075 | ST.accept_buff[ cur ].wordnum, PL_colors[5] ); |
| 3076 | ); |
| 3077 | |
| 3078 | if (ST.accept_buff[cur].wordnum < |
| 3079 | ST.accept_buff[best].wordnum) |
| 3080 | best = cur; |
| 3081 | } |
| 3082 | |
| 3083 | DEBUG_EXECUTE_r({ |
| 3084 | AV *const trie_words |
| 3085 | = (AV *) rexi->data->data[ARG(ST.me)+TRIE_WORDS_OFFSET]; |
| 3086 | SV ** const tmp = av_fetch( trie_words, |
| 3087 | ST.accept_buff[ best ].wordnum - 1, 0 ); |
| 3088 | regnode *nextop=(!ST.jump || !ST.jump[ST.accept_buff[best].wordnum]) ? |
| 3089 | ST.B : |
| 3090 | ST.me + ST.jump[ST.accept_buff[best].wordnum]; |
| 3091 | SV *sv= tmp ? sv_newmortal() : NULL; |
| 3092 | |
| 3093 | PerlIO_printf( Perl_debug_log, |
| 3094 | "%*s %strying alternation #%d <%s> at node #%d %s\n", |
| 3095 | REPORT_CODE_OFF+depth*2, "", PL_colors[4], |
| 3096 | ST.accept_buff[best].wordnum, |
| 3097 | tmp ? pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), 0, |
| 3098 | PL_colors[0], PL_colors[1], |
| 3099 | (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
| 3100 | ) : "not compiled under -Dr", |
| 3101 | REG_NODE_NUM(nextop), |
| 3102 | PL_colors[5] ); |
| 3103 | }); |
| 3104 | |
| 3105 | if ( best<ST.accepted ) { |
| 3106 | reg_trie_accepted tmp = ST.accept_buff[ best ]; |
| 3107 | ST.accept_buff[ best ] = ST.accept_buff[ ST.accepted ]; |
| 3108 | ST.accept_buff[ ST.accepted ] = tmp; |
| 3109 | best = ST.accepted; |
| 3110 | } |
| 3111 | PL_reginput = (char *)ST.accept_buff[ best ].endpos; |
| 3112 | if ( !ST.jump || !ST.jump[ST.accept_buff[best].wordnum]) { |
| 3113 | scan = ST.B; |
| 3114 | /* NOTREACHED */ |
| 3115 | } else { |
| 3116 | scan = ST.me + ST.jump[ST.accept_buff[best].wordnum]; |
| 3117 | /* NOTREACHED */ |
| 3118 | } |
| 3119 | if (has_cutgroup) { |
| 3120 | PUSH_YES_STATE_GOTO(TRIE_next, scan); |
| 3121 | /* NOTREACHED */ |
| 3122 | } else { |
| 3123 | PUSH_STATE_GOTO(TRIE_next, scan); |
| 3124 | /* NOTREACHED */ |
| 3125 | } |
| 3126 | /* NOTREACHED */ |
| 3127 | } |
| 3128 | /* NOTREACHED */ |
| 3129 | case TRIE_next: |
| 3130 | FREETMPS; |
| 3131 | LEAVE; |
| 3132 | sayYES; |
| 3133 | #undef ST |
| 3134 | |
| 3135 | case EXACT: { |
| 3136 | char *s = STRING(scan); |
| 3137 | ln = STR_LEN(scan); |
| 3138 | if (do_utf8 != UTF) { |
| 3139 | /* The target and the pattern have differing utf8ness. */ |
| 3140 | char *l = locinput; |
| 3141 | const char * const e = s + ln; |
| 3142 | |
| 3143 | if (do_utf8) { |
| 3144 | /* The target is utf8, the pattern is not utf8. */ |
| 3145 | while (s < e) { |
| 3146 | STRLEN ulen; |
| 3147 | if (l >= PL_regeol) |
| 3148 | sayNO; |
| 3149 | if (NATIVE_TO_UNI(*(U8*)s) != |
| 3150 | utf8n_to_uvuni((U8*)l, UTF8_MAXBYTES, &ulen, |
| 3151 | uniflags)) |
| 3152 | sayNO; |
| 3153 | l += ulen; |
| 3154 | s ++; |
| 3155 | } |
| 3156 | } |
| 3157 | else { |
| 3158 | /* The target is not utf8, the pattern is utf8. */ |
| 3159 | while (s < e) { |
| 3160 | STRLEN ulen; |
| 3161 | if (l >= PL_regeol) |
| 3162 | sayNO; |
| 3163 | if (NATIVE_TO_UNI(*((U8*)l)) != |
| 3164 | utf8n_to_uvuni((U8*)s, UTF8_MAXBYTES, &ulen, |
| 3165 | uniflags)) |
| 3166 | sayNO; |
| 3167 | s += ulen; |
| 3168 | l ++; |
| 3169 | } |
| 3170 | } |
| 3171 | locinput = l; |
| 3172 | nextchr = UCHARAT(locinput); |
| 3173 | break; |
| 3174 | } |
| 3175 | /* The target and the pattern have the same utf8ness. */ |
| 3176 | /* Inline the first character, for speed. */ |
| 3177 | if (UCHARAT(s) != nextchr) |
| 3178 | sayNO; |
| 3179 | if (PL_regeol - locinput < ln) |
| 3180 | sayNO; |
| 3181 | if (ln > 1 && memNE(s, locinput, ln)) |
| 3182 | sayNO; |
| 3183 | locinput += ln; |
| 3184 | nextchr = UCHARAT(locinput); |
| 3185 | break; |
| 3186 | } |
| 3187 | case EXACTFL: |
| 3188 | PL_reg_flags |= RF_tainted; |
| 3189 | /* FALL THROUGH */ |
| 3190 | case EXACTF: { |
| 3191 | char * const s = STRING(scan); |
| 3192 | ln = STR_LEN(scan); |
| 3193 | |
| 3194 | if (do_utf8 || UTF) { |
| 3195 | /* Either target or the pattern are utf8. */ |
| 3196 | const char * const l = locinput; |
| 3197 | char *e = PL_regeol; |
| 3198 | |
| 3199 | if (ibcmp_utf8(s, 0, ln, (bool)UTF, |
| 3200 | l, &e, 0, do_utf8)) { |
| 3201 | /* One more case for the sharp s: |
| 3202 | * pack("U0U*", 0xDF) =~ /ss/i, |
| 3203 | * the 0xC3 0x9F are the UTF-8 |
| 3204 | * byte sequence for the U+00DF. */ |
| 3205 | if (!(do_utf8 && |
| 3206 | toLOWER(s[0]) == 's' && |
| 3207 | ln >= 2 && |
| 3208 | toLOWER(s[1]) == 's' && |
| 3209 | (U8)l[0] == 0xC3 && |
| 3210 | e - l >= 2 && |
| 3211 | (U8)l[1] == 0x9F)) |
| 3212 | sayNO; |
| 3213 | } |
| 3214 | locinput = e; |
| 3215 | nextchr = UCHARAT(locinput); |
| 3216 | break; |
| 3217 | } |
| 3218 | |
| 3219 | /* Neither the target and the pattern are utf8. */ |
| 3220 | |
| 3221 | /* Inline the first character, for speed. */ |
| 3222 | if (UCHARAT(s) != nextchr && |
| 3223 | UCHARAT(s) != ((OP(scan) == EXACTF) |
| 3224 | ? PL_fold : PL_fold_locale)[nextchr]) |
| 3225 | sayNO; |
| 3226 | if (PL_regeol - locinput < ln) |
| 3227 | sayNO; |
| 3228 | if (ln > 1 && (OP(scan) == EXACTF |
| 3229 | ? ibcmp(s, locinput, ln) |
| 3230 | : ibcmp_locale(s, locinput, ln))) |
| 3231 | sayNO; |
| 3232 | locinput += ln; |
| 3233 | nextchr = UCHARAT(locinput); |
| 3234 | break; |
| 3235 | } |
| 3236 | case ANYOF: |
| 3237 | if (do_utf8) { |
| 3238 | STRLEN inclasslen = PL_regeol - locinput; |
| 3239 | |
| 3240 | if (!reginclass(rex, scan, (U8*)locinput, &inclasslen, do_utf8)) |
| 3241 | goto anyof_fail; |
| 3242 | if (locinput >= PL_regeol) |
| 3243 | sayNO; |
| 3244 | locinput += inclasslen ? inclasslen : UTF8SKIP(locinput); |
| 3245 | nextchr = UCHARAT(locinput); |
| 3246 | break; |
| 3247 | } |
| 3248 | else { |
| 3249 | if (nextchr < 0) |
| 3250 | nextchr = UCHARAT(locinput); |
| 3251 | if (!REGINCLASS(rex, scan, (U8*)locinput)) |
| 3252 | goto anyof_fail; |
| 3253 | if (!nextchr && locinput >= PL_regeol) |
| 3254 | sayNO; |
| 3255 | nextchr = UCHARAT(++locinput); |
| 3256 | break; |
| 3257 | } |
| 3258 | anyof_fail: |
| 3259 | /* If we might have the case of the German sharp s |
| 3260 | * in a casefolding Unicode character class. */ |
| 3261 | |
| 3262 | if (ANYOF_FOLD_SHARP_S(scan, locinput, PL_regeol)) { |
| 3263 | locinput += SHARP_S_SKIP; |
| 3264 | nextchr = UCHARAT(locinput); |
| 3265 | } |
| 3266 | else |
| 3267 | sayNO; |
| 3268 | break; |
| 3269 | case ALNUML: |
| 3270 | PL_reg_flags |= RF_tainted; |
| 3271 | /* FALL THROUGH */ |
| 3272 | case ALNUM: |
| 3273 | if (!nextchr) |
| 3274 | sayNO; |
| 3275 | if (do_utf8) { |
| 3276 | LOAD_UTF8_CHARCLASS_ALNUM(); |
| 3277 | if (!(OP(scan) == ALNUM |
| 3278 | ? (bool)swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8) |
| 3279 | : isALNUM_LC_utf8((U8*)locinput))) |
| 3280 | { |
| 3281 | sayNO; |
| 3282 | } |
| 3283 | locinput += PL_utf8skip[nextchr]; |
| 3284 | nextchr = UCHARAT(locinput); |
| 3285 | break; |
| 3286 | } |
| 3287 | if (!(OP(scan) == ALNUM |
| 3288 | ? isALNUM(nextchr) : isALNUM_LC(nextchr))) |
| 3289 | sayNO; |
| 3290 | nextchr = UCHARAT(++locinput); |
| 3291 | break; |
| 3292 | case NALNUML: |
| 3293 | PL_reg_flags |= RF_tainted; |
| 3294 | /* FALL THROUGH */ |
| 3295 | case NALNUM: |
| 3296 | if (!nextchr && locinput >= PL_regeol) |
| 3297 | sayNO; |
| 3298 | if (do_utf8) { |
| 3299 | LOAD_UTF8_CHARCLASS_ALNUM(); |
| 3300 | if (OP(scan) == NALNUM |
| 3301 | ? (bool)swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8) |
| 3302 | : isALNUM_LC_utf8((U8*)locinput)) |
| 3303 | { |
| 3304 | sayNO; |
| 3305 | } |
| 3306 | locinput += PL_utf8skip[nextchr]; |
| 3307 | nextchr = UCHARAT(locinput); |
| 3308 | break; |
| 3309 | } |
| 3310 | if (OP(scan) == NALNUM |
| 3311 | ? isALNUM(nextchr) : isALNUM_LC(nextchr)) |
| 3312 | sayNO; |
| 3313 | nextchr = UCHARAT(++locinput); |
| 3314 | break; |
| 3315 | case BOUNDL: |
| 3316 | case NBOUNDL: |
| 3317 | PL_reg_flags |= RF_tainted; |
| 3318 | /* FALL THROUGH */ |
| 3319 | case BOUND: |
| 3320 | case NBOUND: |
| 3321 | /* was last char in word? */ |
| 3322 | if (do_utf8) { |
| 3323 | if (locinput == PL_bostr) |
| 3324 | ln = '\n'; |
| 3325 | else { |
| 3326 | const U8 * const r = reghop3((U8*)locinput, -1, (U8*)PL_bostr); |
| 3327 | |
| 3328 | ln = utf8n_to_uvchr(r, UTF8SKIP(r), 0, uniflags); |
| 3329 | } |
| 3330 | if (OP(scan) == BOUND || OP(scan) == NBOUND) { |
| 3331 | ln = isALNUM_uni(ln); |
| 3332 | LOAD_UTF8_CHARCLASS_ALNUM(); |
| 3333 | n = swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8); |
| 3334 | } |
| 3335 | else { |
| 3336 | ln = isALNUM_LC_uvchr(UNI_TO_NATIVE(ln)); |
| 3337 | n = isALNUM_LC_utf8((U8*)locinput); |
| 3338 | } |
| 3339 | } |
| 3340 | else { |
| 3341 | ln = (locinput != PL_bostr) ? |
| 3342 | UCHARAT(locinput - 1) : '\n'; |
| 3343 | if (OP(scan) == BOUND || OP(scan) == NBOUND) { |
| 3344 | ln = isALNUM(ln); |
| 3345 | n = isALNUM(nextchr); |
| 3346 | } |
| 3347 | else { |
| 3348 | ln = isALNUM_LC(ln); |
| 3349 | n = isALNUM_LC(nextchr); |
| 3350 | } |
| 3351 | } |
| 3352 | if (((!ln) == (!n)) == (OP(scan) == BOUND || |
| 3353 | OP(scan) == BOUNDL)) |
| 3354 | sayNO; |
| 3355 | break; |
| 3356 | case SPACEL: |
| 3357 | PL_reg_flags |= RF_tainted; |
| 3358 | /* FALL THROUGH */ |
| 3359 | case SPACE: |
| 3360 | if (!nextchr) |
| 3361 | sayNO; |
| 3362 | if (do_utf8) { |
| 3363 | if (UTF8_IS_CONTINUED(nextchr)) { |
| 3364 | LOAD_UTF8_CHARCLASS_SPACE(); |
| 3365 | if (!(OP(scan) == SPACE |
| 3366 | ? (bool)swash_fetch(PL_utf8_space, (U8*)locinput, do_utf8) |
| 3367 | : isSPACE_LC_utf8((U8*)locinput))) |
| 3368 | { |
| 3369 | sayNO; |
| 3370 | } |
| 3371 | locinput += PL_utf8skip[nextchr]; |
| 3372 | nextchr = UCHARAT(locinput); |
| 3373 | break; |
| 3374 | } |
| 3375 | if (!(OP(scan) == SPACE |
| 3376 | ? isSPACE(nextchr) : isSPACE_LC(nextchr))) |
| 3377 | sayNO; |
| 3378 | nextchr = UCHARAT(++locinput); |
| 3379 | } |
| 3380 | else { |
| 3381 | if (!(OP(scan) == SPACE |
| 3382 | ? isSPACE(nextchr) : isSPACE_LC(nextchr))) |
| 3383 | sayNO; |
| 3384 | nextchr = UCHARAT(++locinput); |
| 3385 | } |
| 3386 | break; |
| 3387 | case NSPACEL: |
| 3388 | PL_reg_flags |= RF_tainted; |
| 3389 | /* FALL THROUGH */ |
| 3390 | case NSPACE: |
| 3391 | if (!nextchr && locinput >= PL_regeol) |
| 3392 | sayNO; |
| 3393 | if (do_utf8) { |
| 3394 | LOAD_UTF8_CHARCLASS_SPACE(); |
| 3395 | if (OP(scan) == NSPACE |
| 3396 | ? (bool)swash_fetch(PL_utf8_space, (U8*)locinput, do_utf8) |
| 3397 | : isSPACE_LC_utf8((U8*)locinput)) |
| 3398 | { |
| 3399 | sayNO; |
| 3400 | } |
| 3401 | locinput += PL_utf8skip[nextchr]; |
| 3402 | nextchr = UCHARAT(locinput); |
| 3403 | break; |
| 3404 | } |
| 3405 | if (OP(scan) == NSPACE |
| 3406 | ? isSPACE(nextchr) : isSPACE_LC(nextchr)) |
| 3407 | sayNO; |
| 3408 | nextchr = UCHARAT(++locinput); |
| 3409 | break; |
| 3410 | case DIGITL: |
| 3411 | PL_reg_flags |= RF_tainted; |
| 3412 | /* FALL THROUGH */ |
| 3413 | case DIGIT: |
| 3414 | if (!nextchr) |
| 3415 | sayNO; |
| 3416 | if (do_utf8) { |
| 3417 | LOAD_UTF8_CHARCLASS_DIGIT(); |
| 3418 | if (!(OP(scan) == DIGIT |
| 3419 | ? (bool)swash_fetch(PL_utf8_digit, (U8*)locinput, do_utf8) |
| 3420 | : isDIGIT_LC_utf8((U8*)locinput))) |
| 3421 | { |
| 3422 | sayNO; |
| 3423 | } |
| 3424 | locinput += PL_utf8skip[nextchr]; |
| 3425 | nextchr = UCHARAT(locinput); |
| 3426 | break; |
| 3427 | } |
| 3428 | if (!(OP(scan) == DIGIT |
| 3429 | ? isDIGIT(nextchr) : isDIGIT_LC(nextchr))) |
| 3430 | sayNO; |
| 3431 | nextchr = UCHARAT(++locinput); |
| 3432 | break; |
| 3433 | case NDIGITL: |
| 3434 | PL_reg_flags |= RF_tainted; |
| 3435 | /* FALL THROUGH */ |
| 3436 | case NDIGIT: |
| 3437 | if (!nextchr && locinput >= PL_regeol) |
| 3438 | sayNO; |
| 3439 | if (do_utf8) { |
| 3440 | LOAD_UTF8_CHARCLASS_DIGIT(); |
| 3441 | if (OP(scan) == NDIGIT |
| 3442 | ? (bool)swash_fetch(PL_utf8_digit, (U8*)locinput, do_utf8) |
| 3443 | : isDIGIT_LC_utf8((U8*)locinput)) |
| 3444 | { |
| 3445 | sayNO; |
| 3446 | } |
| 3447 | locinput += PL_utf8skip[nextchr]; |
| 3448 | nextchr = UCHARAT(locinput); |
| 3449 | break; |
| 3450 | } |
| 3451 | if (OP(scan) == NDIGIT |
| 3452 | ? isDIGIT(nextchr) : isDIGIT_LC(nextchr)) |
| 3453 | sayNO; |
| 3454 | nextchr = UCHARAT(++locinput); |
| 3455 | break; |
| 3456 | case CLUMP: |
| 3457 | if (locinput >= PL_regeol) |
| 3458 | sayNO; |
| 3459 | if (do_utf8) { |
| 3460 | LOAD_UTF8_CHARCLASS_MARK(); |
| 3461 | if (swash_fetch(PL_utf8_mark,(U8*)locinput, do_utf8)) |
| 3462 | sayNO; |
| 3463 | locinput += PL_utf8skip[nextchr]; |
| 3464 | while (locinput < PL_regeol && |
| 3465 | swash_fetch(PL_utf8_mark,(U8*)locinput, do_utf8)) |
| 3466 | locinput += UTF8SKIP(locinput); |
| 3467 | if (locinput > PL_regeol) |
| 3468 | sayNO; |
| 3469 | } |
| 3470 | else |
| 3471 | locinput++; |
| 3472 | nextchr = UCHARAT(locinput); |
| 3473 | break; |
| 3474 | |
| 3475 | case NREFFL: |
| 3476 | { |
| 3477 | char *s; |
| 3478 | char type; |
| 3479 | PL_reg_flags |= RF_tainted; |
| 3480 | /* FALL THROUGH */ |
| 3481 | case NREF: |
| 3482 | case NREFF: |
| 3483 | type = OP(scan); |
| 3484 | n = reg_check_named_buff_matched(rex,scan); |
| 3485 | |
| 3486 | if ( n ) { |
| 3487 | type = REF + ( type - NREF ); |
| 3488 | goto do_ref; |
| 3489 | } else { |
| 3490 | sayNO; |
| 3491 | } |
| 3492 | /* unreached */ |
| 3493 | case REFFL: |
| 3494 | PL_reg_flags |= RF_tainted; |
| 3495 | /* FALL THROUGH */ |
| 3496 | case REF: |
| 3497 | case REFF: |
| 3498 | n = ARG(scan); /* which paren pair */ |
| 3499 | type = OP(scan); |
| 3500 | do_ref: |
| 3501 | ln = PL_regstartp[n]; |
| 3502 | PL_reg_leftiter = PL_reg_maxiter; /* Void cache */ |
| 3503 | if (*PL_reglastparen < n || ln == -1) |
| 3504 | sayNO; /* Do not match unless seen CLOSEn. */ |
| 3505 | if (ln == PL_regendp[n]) |
| 3506 | break; |
| 3507 | |
| 3508 | s = PL_bostr + ln; |
| 3509 | if (do_utf8 && type != REF) { /* REF can do byte comparison */ |
| 3510 | char *l = locinput; |
| 3511 | const char *e = PL_bostr + PL_regendp[n]; |
| 3512 | /* |
| 3513 | * Note that we can't do the "other character" lookup trick as |
| 3514 | * in the 8-bit case (no pun intended) because in Unicode we |
| 3515 | * have to map both upper and title case to lower case. |
| 3516 | */ |
| 3517 | if (type == REFF) { |
| 3518 | while (s < e) { |
| 3519 | STRLEN ulen1, ulen2; |
| 3520 | U8 tmpbuf1[UTF8_MAXBYTES_CASE+1]; |
| 3521 | U8 tmpbuf2[UTF8_MAXBYTES_CASE+1]; |
| 3522 | |
| 3523 | if (l >= PL_regeol) |
| 3524 | sayNO; |
| 3525 | toLOWER_utf8((U8*)s, tmpbuf1, &ulen1); |
| 3526 | toLOWER_utf8((U8*)l, tmpbuf2, &ulen2); |
| 3527 | if (ulen1 != ulen2 || memNE((char *)tmpbuf1, (char *)tmpbuf2, ulen1)) |
| 3528 | sayNO; |
| 3529 | s += ulen1; |
| 3530 | l += ulen2; |
| 3531 | } |
| 3532 | } |
| 3533 | locinput = l; |
| 3534 | nextchr = UCHARAT(locinput); |
| 3535 | break; |
| 3536 | } |
| 3537 | |
| 3538 | /* Inline the first character, for speed. */ |
| 3539 | if (UCHARAT(s) != nextchr && |
| 3540 | (type == REF || |
| 3541 | (UCHARAT(s) != (type == REFF |
| 3542 | ? PL_fold : PL_fold_locale)[nextchr]))) |
| 3543 | sayNO; |
| 3544 | ln = PL_regendp[n] - ln; |
| 3545 | if (locinput + ln > PL_regeol) |
| 3546 | sayNO; |
| 3547 | if (ln > 1 && (type == REF |
| 3548 | ? memNE(s, locinput, ln) |
| 3549 | : (type == REFF |
| 3550 | ? ibcmp(s, locinput, ln) |
| 3551 | : ibcmp_locale(s, locinput, ln)))) |
| 3552 | sayNO; |
| 3553 | locinput += ln; |
| 3554 | nextchr = UCHARAT(locinput); |
| 3555 | break; |
| 3556 | } |
| 3557 | case NOTHING: |
| 3558 | case TAIL: |
| 3559 | break; |
| 3560 | case BACK: |
| 3561 | break; |
| 3562 | |
| 3563 | #undef ST |
| 3564 | #define ST st->u.eval |
| 3565 | { |
| 3566 | SV *ret; |
| 3567 | regexp *re; |
| 3568 | regexp_internal *rei; |
| 3569 | regnode *startpoint; |
| 3570 | |
| 3571 | case GOSTART: |
| 3572 | case GOSUB: /* /(...(?1))/ /(...(?&foo))/ */ |
| 3573 | if (cur_eval && cur_eval->locinput==locinput) { |
| 3574 | if (cur_eval->u.eval.close_paren == (U32)ARG(scan)) |
| 3575 | Perl_croak(aTHX_ "Infinite recursion in regex"); |
| 3576 | if ( ++nochange_depth > max_nochange_depth ) |
| 3577 | Perl_croak(aTHX_ |
| 3578 | "Pattern subroutine nesting without pos change" |
| 3579 | " exceeded limit in regex"); |
| 3580 | } else { |
| 3581 | nochange_depth = 0; |
| 3582 | } |
| 3583 | re = rex; |
| 3584 | rei = rexi; |
| 3585 | (void)ReREFCNT_inc(rex); |
| 3586 | if (OP(scan)==GOSUB) { |
| 3587 | startpoint = scan + ARG2L(scan); |
| 3588 | ST.close_paren = ARG(scan); |
| 3589 | } else { |
| 3590 | startpoint = rei->program+1; |
| 3591 | ST.close_paren = 0; |
| 3592 | } |
| 3593 | goto eval_recurse_doit; |
| 3594 | /* NOTREACHED */ |
| 3595 | case EVAL: /* /(?{A})B/ /(??{A})B/ and /(?(?{A})X|Y)B/ */ |
| 3596 | if (cur_eval && cur_eval->locinput==locinput) { |
| 3597 | if ( ++nochange_depth > max_nochange_depth ) |
| 3598 | Perl_croak(aTHX_ "EVAL without pos change exceeded limit in regex"); |
| 3599 | } else { |
| 3600 | nochange_depth = 0; |
| 3601 | } |
| 3602 | { |
| 3603 | /* execute the code in the {...} */ |
| 3604 | dSP; |
| 3605 | SV ** const before = SP; |
| 3606 | OP_4tree * const oop = PL_op; |
| 3607 | COP * const ocurcop = PL_curcop; |
| 3608 | PAD *old_comppad; |
| 3609 | |
| 3610 | n = ARG(scan); |
| 3611 | PL_op = (OP_4tree*)rexi->data->data[n]; |
| 3612 | DEBUG_STATE_r( PerlIO_printf(Perl_debug_log, |
| 3613 | " re_eval 0x%"UVxf"\n", PTR2UV(PL_op)) ); |
| 3614 | PAD_SAVE_LOCAL(old_comppad, (PAD*)rexi->data->data[n + 2]); |
| 3615 | PL_regendp[0] = PL_reg_magic->mg_len = locinput - PL_bostr; |
| 3616 | |
| 3617 | if (sv_yes_mark) { |
| 3618 | SV *sv_mrk = get_sv("REGMARK", 1); |
| 3619 | sv_setsv(sv_mrk, sv_yes_mark); |
| 3620 | } |
| 3621 | |
| 3622 | CALLRUNOPS(aTHX); /* Scalar context. */ |
| 3623 | SPAGAIN; |
| 3624 | if (SP == before) |
| 3625 | ret = &PL_sv_undef; /* protect against empty (?{}) blocks. */ |
| 3626 | else { |
| 3627 | ret = POPs; |
| 3628 | PUTBACK; |
| 3629 | } |
| 3630 | |
| 3631 | PL_op = oop; |
| 3632 | PAD_RESTORE_LOCAL(old_comppad); |
| 3633 | PL_curcop = ocurcop; |
| 3634 | if (!logical) { |
| 3635 | /* /(?{...})/ */ |
| 3636 | sv_setsv(save_scalar(PL_replgv), ret); |
| 3637 | break; |
| 3638 | } |
| 3639 | } |
| 3640 | if (logical == 2) { /* Postponed subexpression: /(??{...})/ */ |
| 3641 | logical = 0; |
| 3642 | { |
| 3643 | /* extract RE object from returned value; compiling if |
| 3644 | * necessary */ |
| 3645 | |
| 3646 | MAGIC *mg = NULL; |
| 3647 | const SV *sv; |
| 3648 | if(SvROK(ret) && SvSMAGICAL(sv = SvRV(ret))) |
| 3649 | mg = mg_find(sv, PERL_MAGIC_qr); |
| 3650 | else if (SvSMAGICAL(ret)) { |
| 3651 | if (SvGMAGICAL(ret)) |
| 3652 | sv_unmagic(ret, PERL_MAGIC_qr); |
| 3653 | else |
| 3654 | mg = mg_find(ret, PERL_MAGIC_qr); |
| 3655 | } |
| 3656 | |
| 3657 | if (mg) { |
| 3658 | re = reg_temp_copy((regexp *)mg->mg_obj); /*XXX:dmq*/ |
| 3659 | } |
| 3660 | else { |
| 3661 | STRLEN len; |
| 3662 | const char * const t = SvPV_const(ret, len); |
| 3663 | PMOP pm; |
| 3664 | const I32 osize = PL_regsize; |
| 3665 | |
| 3666 | Zero(&pm, 1, PMOP); |
| 3667 | if (DO_UTF8(ret)) pm.op_pmdynflags |= PMdf_DYN_UTF8; |
| 3668 | re = CALLREGCOMP((char*)t, (char*)t + len, &pm); |
| 3669 | if (!(SvFLAGS(ret) |
| 3670 | & (SVs_TEMP | SVs_PADTMP | SVf_READONLY |
| 3671 | | SVs_GMG))) |
| 3672 | sv_magic(ret,(SV*)ReREFCNT_inc(re), |
| 3673 | PERL_MAGIC_qr,0,0); |
| 3674 | PL_regsize = osize; |
| 3675 | } |
| 3676 | } |
| 3677 | RX_MATCH_COPIED_off(re); |
| 3678 | re->subbeg = rex->subbeg; |
| 3679 | re->sublen = rex->sublen; |
| 3680 | rei = RXi_GET(re); |
| 3681 | DEBUG_EXECUTE_r( |
| 3682 | debug_start_match(re, do_utf8, locinput, PL_regeol, |
| 3683 | "Matching embedded"); |
| 3684 | ); |
| 3685 | startpoint = rei->program + 1; |
| 3686 | ST.close_paren = 0; /* only used for GOSUB */ |
| 3687 | /* borrowed from regtry */ |
| 3688 | if (PL_reg_start_tmpl <= re->nparens) { |
| 3689 | PL_reg_start_tmpl = re->nparens*3/2 + 3; |
| 3690 | if(PL_reg_start_tmp) |
| 3691 | Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*); |
| 3692 | else |
| 3693 | Newx(PL_reg_start_tmp, PL_reg_start_tmpl, char*); |
| 3694 | } |
| 3695 | |
| 3696 | eval_recurse_doit: /* Share code with GOSUB below this line */ |
| 3697 | /* run the pattern returned from (??{...}) */ |
| 3698 | ST.cp = regcppush(0); /* Save *all* the positions. */ |
| 3699 | REGCP_SET(ST.lastcp); |
| 3700 | |
| 3701 | PL_regstartp = re->startp; /* essentially NOOP on GOSUB */ |
| 3702 | PL_regendp = re->endp; /* essentially NOOP on GOSUB */ |
| 3703 | |
| 3704 | *PL_reglastparen = 0; |
| 3705 | *PL_reglastcloseparen = 0; |
| 3706 | PL_reginput = locinput; |
| 3707 | PL_regsize = 0; |
| 3708 | |
| 3709 | /* XXXX This is too dramatic a measure... */ |
| 3710 | PL_reg_maxiter = 0; |
| 3711 | |
| 3712 | ST.toggle_reg_flags = PL_reg_flags; |
| 3713 | if (re->extflags & RXf_UTF8) |
| 3714 | PL_reg_flags |= RF_utf8; |
| 3715 | else |
| 3716 | PL_reg_flags &= ~RF_utf8; |
| 3717 | ST.toggle_reg_flags ^= PL_reg_flags; /* diff of old and new */ |
| 3718 | |
| 3719 | ST.prev_rex = rex; |
| 3720 | ST.prev_curlyx = cur_curlyx; |
| 3721 | SETREX(rex,re); |
| 3722 | rexi = rei; |
| 3723 | cur_curlyx = NULL; |
| 3724 | ST.B = next; |
| 3725 | ST.prev_eval = cur_eval; |
| 3726 | cur_eval = st; |
| 3727 | /* now continue from first node in postoned RE */ |
| 3728 | PUSH_YES_STATE_GOTO(EVAL_AB, startpoint); |
| 3729 | /* NOTREACHED */ |
| 3730 | } |
| 3731 | /* logical is 1, /(?(?{...})X|Y)/ */ |
| 3732 | sw = (bool)SvTRUE(ret); |
| 3733 | logical = 0; |
| 3734 | break; |
| 3735 | } |
| 3736 | |
| 3737 | case EVAL_AB: /* cleanup after a successful (??{A})B */ |
| 3738 | /* note: this is called twice; first after popping B, then A */ |
| 3739 | PL_reg_flags ^= ST.toggle_reg_flags; |
| 3740 | ReREFCNT_dec(rex); |
| 3741 | SETREX(rex,ST.prev_rex); |
| 3742 | rexi = RXi_GET(rex); |
| 3743 | regcpblow(ST.cp); |
| 3744 | cur_eval = ST.prev_eval; |
| 3745 | cur_curlyx = ST.prev_curlyx; |
| 3746 | /* XXXX This is too dramatic a measure... */ |
| 3747 | PL_reg_maxiter = 0; |
| 3748 | if ( nochange_depth ) |
| 3749 | nochange_depth--; |
| 3750 | sayYES; |
| 3751 | |
| 3752 | |
| 3753 | case EVAL_AB_fail: /* unsuccessfully ran A or B in (??{A})B */ |
| 3754 | /* note: this is called twice; first after popping B, then A */ |
| 3755 | PL_reg_flags ^= ST.toggle_reg_flags; |
| 3756 | ReREFCNT_dec(rex); |
| 3757 | SETREX(rex,ST.prev_rex); |
| 3758 | rexi = RXi_GET(rex); |
| 3759 | PL_reginput = locinput; |
| 3760 | REGCP_UNWIND(ST.lastcp); |
| 3761 | regcppop(rex); |
| 3762 | cur_eval = ST.prev_eval; |
| 3763 | cur_curlyx = ST.prev_curlyx; |
| 3764 | /* XXXX This is too dramatic a measure... */ |
| 3765 | PL_reg_maxiter = 0; |
| 3766 | if ( nochange_depth ) |
| 3767 | nochange_depth--; |
| 3768 | sayNO_SILENT; |
| 3769 | #undef ST |
| 3770 | |
| 3771 | case OPEN: |
| 3772 | n = ARG(scan); /* which paren pair */ |
| 3773 | PL_reg_start_tmp[n] = locinput; |
| 3774 | if (n > PL_regsize) |
| 3775 | PL_regsize = n; |
| 3776 | lastopen = n; |
| 3777 | break; |
| 3778 | case CLOSE: |
| 3779 | n = ARG(scan); /* which paren pair */ |
| 3780 | PL_regstartp[n] = PL_reg_start_tmp[n] - PL_bostr; |
| 3781 | PL_regendp[n] = locinput - PL_bostr; |
| 3782 | /*if (n > PL_regsize) |
| 3783 | PL_regsize = n;*/ |
| 3784 | if (n > *PL_reglastparen) |
| 3785 | *PL_reglastparen = n; |
| 3786 | *PL_reglastcloseparen = n; |
| 3787 | if (cur_eval && cur_eval->u.eval.close_paren == n) { |
| 3788 | goto fake_end; |
| 3789 | } |
| 3790 | break; |
| 3791 | case ACCEPT: |
| 3792 | if (ARG(scan)){ |
| 3793 | regnode *cursor; |
| 3794 | for (cursor=scan; |
| 3795 | cursor && OP(cursor)!=END; |
| 3796 | cursor=regnext(cursor)) |
| 3797 | { |
| 3798 | if ( OP(cursor)==CLOSE ){ |
| 3799 | n = ARG(cursor); |
| 3800 | if ( n <= lastopen ) { |
| 3801 | PL_regstartp[n] = PL_reg_start_tmp[n] - PL_bostr; |
| 3802 | PL_regendp[n] = locinput - PL_bostr; |
| 3803 | /*if (n > PL_regsize) |
| 3804 | PL_regsize = n;*/ |
| 3805 | if (n > *PL_reglastparen) |
| 3806 | *PL_reglastparen = n; |
| 3807 | *PL_reglastcloseparen = n; |
| 3808 | if ( n == ARG(scan) || (cur_eval && |
| 3809 | cur_eval->u.eval.close_paren == n)) |
| 3810 | break; |
| 3811 | } |
| 3812 | } |
| 3813 | } |
| 3814 | } |
| 3815 | goto fake_end; |
| 3816 | /*NOTREACHED*/ |
| 3817 | case GROUPP: |
| 3818 | n = ARG(scan); /* which paren pair */ |
| 3819 | sw = (bool)(*PL_reglastparen >= n && PL_regendp[n] != -1); |
| 3820 | break; |
| 3821 | case NGROUPP: |
| 3822 | /* reg_check_named_buff_matched returns 0 for no match */ |
| 3823 | sw = (bool)(0 < reg_check_named_buff_matched(rex,scan)); |
| 3824 | break; |
| 3825 | case INSUBP: |
| 3826 | n = ARG(scan); |
| 3827 | sw = (cur_eval && (!n || cur_eval->u.eval.close_paren == n)); |
| 3828 | break; |
| 3829 | case DEFINEP: |
| 3830 | sw = 0; |
| 3831 | break; |
| 3832 | case IFTHEN: |
| 3833 | PL_reg_leftiter = PL_reg_maxiter; /* Void cache */ |
| 3834 | if (sw) |
| 3835 | next = NEXTOPER(NEXTOPER(scan)); |
| 3836 | else { |
| 3837 | next = scan + ARG(scan); |
| 3838 | if (OP(next) == IFTHEN) /* Fake one. */ |
| 3839 | next = NEXTOPER(NEXTOPER(next)); |
| 3840 | } |
| 3841 | break; |
| 3842 | case LOGICAL: |
| 3843 | logical = scan->flags; |
| 3844 | break; |
| 3845 | |
| 3846 | /******************************************************************* |
| 3847 | |
| 3848 | The CURLYX/WHILEM pair of ops handle the most generic case of the /A*B/ |
| 3849 | pattern, where A and B are subpatterns. (For simple A, CURLYM or |
| 3850 | STAR/PLUS/CURLY/CURLYN are used instead.) |
| 3851 | |
| 3852 | A*B is compiled as <CURLYX><A><WHILEM><B> |
| 3853 | |
| 3854 | On entry to the subpattern, CURLYX is called. This pushes a CURLYX |
| 3855 | state, which contains the current count, initialised to -1. It also sets |
| 3856 | cur_curlyx to point to this state, with any previous value saved in the |
| 3857 | state block. |
| 3858 | |
| 3859 | CURLYX then jumps straight to the WHILEM op, rather than executing A, |
| 3860 | since the pattern may possibly match zero times (i.e. it's a while {} loop |
| 3861 | rather than a do {} while loop). |
| 3862 | |
| 3863 | Each entry to WHILEM represents a successful match of A. The count in the |
| 3864 | CURLYX block is incremented, another WHILEM state is pushed, and execution |
| 3865 | passes to A or B depending on greediness and the current count. |
| 3866 | |
| 3867 | For example, if matching against the string a1a2a3b (where the aN are |
| 3868 | substrings that match /A/), then the match progresses as follows: (the |
| 3869 | pushed states are interspersed with the bits of strings matched so far): |
| 3870 | |
| 3871 | <CURLYX cnt=-1> |
| 3872 | <CURLYX cnt=0><WHILEM> |
| 3873 | <CURLYX cnt=1><WHILEM> a1 <WHILEM> |
| 3874 | <CURLYX cnt=2><WHILEM> a1 <WHILEM> a2 <WHILEM> |
| 3875 | <CURLYX cnt=3><WHILEM> a1 <WHILEM> a2 <WHILEM> a3 <WHILEM> |
| 3876 | <CURLYX cnt=3><WHILEM> a1 <WHILEM> a2 <WHILEM> a3 <WHILEM> b |
| 3877 | |
| 3878 | (Contrast this with something like CURLYM, which maintains only a single |
| 3879 | backtrack state: |
| 3880 | |
| 3881 | <CURLYM cnt=0> a1 |
| 3882 | a1 <CURLYM cnt=1> a2 |
| 3883 | a1 a2 <CURLYM cnt=2> a3 |
| 3884 | a1 a2 a3 <CURLYM cnt=3> b |
| 3885 | ) |
| 3886 | |
| 3887 | Each WHILEM state block marks a point to backtrack to upon partial failure |
| 3888 | of A or B, and also contains some minor state data related to that |
| 3889 | iteration. The CURLYX block, pointed to by cur_curlyx, contains the |
| 3890 | overall state, such as the count, and pointers to the A and B ops. |
| 3891 | |
| 3892 | This is complicated slightly by nested CURLYX/WHILEM's. Since cur_curlyx |
| 3893 | must always point to the *current* CURLYX block, the rules are: |
| 3894 | |
| 3895 | When executing CURLYX, save the old cur_curlyx in the CURLYX state block, |
| 3896 | and set cur_curlyx to point the new block. |
| 3897 | |
| 3898 | When popping the CURLYX block after a successful or unsuccessful match, |
| 3899 | restore the previous cur_curlyx. |
| 3900 | |
| 3901 | When WHILEM is about to execute B, save the current cur_curlyx, and set it |
| 3902 | to the outer one saved in the CURLYX block. |
| 3903 | |
| 3904 | When popping the WHILEM block after a successful or unsuccessful B match, |
| 3905 | restore the previous cur_curlyx. |
| 3906 | |
| 3907 | Here's an example for the pattern (AI* BI)*BO |
| 3908 | I and O refer to inner and outer, C and W refer to CURLYX and WHILEM: |
| 3909 | |
| 3910 | cur_ |
| 3911 | curlyx backtrack stack |
| 3912 | ------ --------------- |
| 3913 | NULL |
| 3914 | CO <CO prev=NULL> <WO> |
| 3915 | CI <CO prev=NULL> <WO> <CI prev=CO> <WI> ai |
| 3916 | CO <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi |
| 3917 | NULL <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi <WO prev=CO> bo |
| 3918 | |
| 3919 | At this point the pattern succeeds, and we work back down the stack to |
| 3920 | clean up, restoring as we go: |
| 3921 | |
| 3922 | CO <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi |
| 3923 | CI <CO prev=NULL> <WO> <CI prev=CO> <WI> ai |
| 3924 | CO <CO prev=NULL> <WO> |
| 3925 | NULL |
| 3926 | |
| 3927 | *******************************************************************/ |
| 3928 | |
| 3929 | #define ST st->u.curlyx |
| 3930 | |
| 3931 | case CURLYX: /* start of /A*B/ (for complex A) */ |
| 3932 | { |
| 3933 | /* No need to save/restore up to this paren */ |
| 3934 | I32 parenfloor = scan->flags; |
| 3935 | |
| 3936 | assert(next); /* keep Coverity happy */ |
| 3937 | if (OP(PREVOPER(next)) == NOTHING) /* LONGJMP */ |
| 3938 | next += ARG(next); |
| 3939 | |
| 3940 | /* XXXX Probably it is better to teach regpush to support |
| 3941 | parenfloor > PL_regsize... */ |
| 3942 | if (parenfloor > (I32)*PL_reglastparen) |
| 3943 | parenfloor = *PL_reglastparen; /* Pessimization... */ |
| 3944 | |
| 3945 | ST.prev_curlyx= cur_curlyx; |
| 3946 | cur_curlyx = st; |
| 3947 | ST.cp = PL_savestack_ix; |
| 3948 | |
| 3949 | /* these fields contain the state of the current curly. |
| 3950 | * they are accessed by subsequent WHILEMs */ |
| 3951 | ST.parenfloor = parenfloor; |
| 3952 | ST.min = ARG1(scan); |
| 3953 | ST.max = ARG2(scan); |
| 3954 | ST.A = NEXTOPER(scan) + EXTRA_STEP_2ARGS; |
| 3955 | ST.B = next; |
| 3956 | ST.minmod = minmod; |
| 3957 | minmod = 0; |
| 3958 | ST.count = -1; /* this will be updated by WHILEM */ |
| 3959 | ST.lastloc = NULL; /* this will be updated by WHILEM */ |
| 3960 | |
| 3961 | PL_reginput = locinput; |
| 3962 | PUSH_YES_STATE_GOTO(CURLYX_end, PREVOPER(next)); |
| 3963 | /* NOTREACHED */ |
| 3964 | } |
| 3965 | |
| 3966 | case CURLYX_end: /* just finished matching all of A*B */ |
| 3967 | if (PL_reg_eval_set){ |
| 3968 | SV *pres= GvSV(PL_replgv); |
| 3969 | SvREFCNT_inc(pres); |
| 3970 | regcpblow(ST.cp); |
| 3971 | sv_setsv(GvSV(PL_replgv), pres); |
| 3972 | SvREFCNT_dec(pres); |
| 3973 | } else { |
| 3974 | regcpblow(ST.cp); |
| 3975 | } |
| 3976 | cur_curlyx = ST.prev_curlyx; |
| 3977 | sayYES; |
| 3978 | /* NOTREACHED */ |
| 3979 | |
| 3980 | case CURLYX_end_fail: /* just failed to match all of A*B */ |
| 3981 | regcpblow(ST.cp); |
| 3982 | cur_curlyx = ST.prev_curlyx; |
| 3983 | sayNO; |
| 3984 | /* NOTREACHED */ |
| 3985 | |
| 3986 | |
| 3987 | #undef ST |
| 3988 | #define ST st->u.whilem |
| 3989 | |
| 3990 | case WHILEM: /* just matched an A in /A*B/ (for complex A) */ |
| 3991 | { |
| 3992 | /* see the discussion above about CURLYX/WHILEM */ |
| 3993 | I32 n; |
| 3994 | assert(cur_curlyx); /* keep Coverity happy */ |
| 3995 | n = ++cur_curlyx->u.curlyx.count; /* how many A's matched */ |
| 3996 | ST.save_lastloc = cur_curlyx->u.curlyx.lastloc; |
| 3997 | ST.cache_offset = 0; |
| 3998 | ST.cache_mask = 0; |
| 3999 | |
| 4000 | PL_reginput = locinput; |
| 4001 | |
| 4002 | DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, |
| 4003 | "%*s whilem: matched %ld out of %ld..%ld\n", |
| 4004 | REPORT_CODE_OFF+depth*2, "", (long)n, |
| 4005 | (long)cur_curlyx->u.curlyx.min, |
| 4006 | (long)cur_curlyx->u.curlyx.max) |
| 4007 | ); |
| 4008 | |
| 4009 | /* First just match a string of min A's. */ |
| 4010 | |
| 4011 | if (n < cur_curlyx->u.curlyx.min) { |
| 4012 | cur_curlyx->u.curlyx.lastloc = locinput; |
| 4013 | PUSH_STATE_GOTO(WHILEM_A_pre, cur_curlyx->u.curlyx.A); |
| 4014 | /* NOTREACHED */ |
| 4015 | } |
| 4016 | |
| 4017 | /* If degenerate A matches "", assume A done. */ |
| 4018 | |
| 4019 | if (locinput == cur_curlyx->u.curlyx.lastloc) { |
| 4020 | DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, |
| 4021 | "%*s whilem: empty match detected, trying continuation...\n", |
| 4022 | REPORT_CODE_OFF+depth*2, "") |
| 4023 | ); |
| 4024 | goto do_whilem_B_max; |
| 4025 | } |
| 4026 | |
| 4027 | /* super-linear cache processing */ |
| 4028 | |
| 4029 | if (scan->flags) { |
| 4030 | |
| 4031 | if (!PL_reg_maxiter) { |
| 4032 | /* start the countdown: Postpone detection until we |
| 4033 | * know the match is not *that* much linear. */ |
| 4034 | PL_reg_maxiter = (PL_regeol - PL_bostr + 1) * (scan->flags>>4); |
| 4035 | /* possible overflow for long strings and many CURLYX's */ |
| 4036 | if (PL_reg_maxiter < 0) |
| 4037 | PL_reg_maxiter = I32_MAX; |
| 4038 | PL_reg_leftiter = PL_reg_maxiter; |
| 4039 | } |
| 4040 | |
| 4041 | if (PL_reg_leftiter-- == 0) { |
| 4042 | /* initialise cache */ |
| 4043 | const I32 size = (PL_reg_maxiter + 7)/8; |
| 4044 | if (PL_reg_poscache) { |
| 4045 | if ((I32)PL_reg_poscache_size < size) { |
| 4046 | Renew(PL_reg_poscache, size, char); |
| 4047 | PL_reg_poscache_size = size; |
| 4048 | } |
| 4049 | Zero(PL_reg_poscache, size, char); |
| 4050 | } |
| 4051 | else { |
| 4052 | PL_reg_poscache_size = size; |
| 4053 | Newxz(PL_reg_poscache, size, char); |
| 4054 | } |
| 4055 | DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, |
| 4056 | "%swhilem: Detected a super-linear match, switching on caching%s...\n", |
| 4057 | PL_colors[4], PL_colors[5]) |
| 4058 | ); |
| 4059 | } |
| 4060 | |
| 4061 | if (PL_reg_leftiter < 0) { |
| 4062 | /* have we already failed at this position? */ |
| 4063 | I32 offset, mask; |
| 4064 | offset = (scan->flags & 0xf) - 1 |
| 4065 | + (locinput - PL_bostr) * (scan->flags>>4); |
| 4066 | mask = 1 << (offset % 8); |
| 4067 | offset /= 8; |
| 4068 | if (PL_reg_poscache[offset] & mask) { |
| 4069 | DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, |
| 4070 | "%*s whilem: (cache) already tried at this position...\n", |
| 4071 | REPORT_CODE_OFF+depth*2, "") |
| 4072 | ); |
| 4073 | sayNO; /* cache records failure */ |
| 4074 | } |
| 4075 | ST.cache_offset = offset; |
| 4076 | ST.cache_mask = mask; |
| 4077 | } |
| 4078 | } |
| 4079 | |
| 4080 | /* Prefer B over A for minimal matching. */ |
| 4081 | |
| 4082 | if (cur_curlyx->u.curlyx.minmod) { |
| 4083 | ST.save_curlyx = cur_curlyx; |
| 4084 | cur_curlyx = cur_curlyx->u.curlyx.prev_curlyx; |
| 4085 | ST.cp = regcppush(ST.save_curlyx->u.curlyx.parenfloor); |
| 4086 | REGCP_SET(ST.lastcp); |
| 4087 | PUSH_YES_STATE_GOTO(WHILEM_B_min, ST.save_curlyx->u.curlyx.B); |
| 4088 | /* NOTREACHED */ |
| 4089 | } |
| 4090 | |
| 4091 | /* Prefer A over B for maximal matching. */ |
| 4092 | |
| 4093 | if (n < cur_curlyx->u.curlyx.max) { /* More greed allowed? */ |
| 4094 | ST.cp = regcppush(cur_curlyx->u.curlyx.parenfloor); |
| 4095 | cur_curlyx->u.curlyx.lastloc = locinput; |
| 4096 | REGCP_SET(ST.lastcp); |
| 4097 | PUSH_STATE_GOTO(WHILEM_A_max, cur_curlyx->u.curlyx.A); |
| 4098 | /* NOTREACHED */ |
| 4099 | } |
| 4100 | goto do_whilem_B_max; |
| 4101 | } |
| 4102 | /* NOTREACHED */ |
| 4103 | |
| 4104 | case WHILEM_B_min: /* just matched B in a minimal match */ |
| 4105 | case WHILEM_B_max: /* just matched B in a maximal match */ |
| 4106 | cur_curlyx = ST.save_curlyx; |
| 4107 | sayYES; |
| 4108 | /* NOTREACHED */ |
| 4109 | |
| 4110 | case WHILEM_B_max_fail: /* just failed to match B in a maximal match */ |
| 4111 | cur_curlyx = ST.save_curlyx; |
| 4112 | cur_curlyx->u.curlyx.lastloc = ST.save_lastloc; |
| 4113 | cur_curlyx->u.curlyx.count--; |
| 4114 | CACHEsayNO; |
| 4115 | /* NOTREACHED */ |
| 4116 | |
| 4117 | case WHILEM_A_min_fail: /* just failed to match A in a minimal match */ |
| 4118 | REGCP_UNWIND(ST.lastcp); |
| 4119 | regcppop(rex); |
| 4120 | /* FALL THROUGH */ |
| 4121 | case WHILEM_A_pre_fail: /* just failed to match even minimal A */ |
| 4122 | cur_curlyx->u.curlyx.lastloc = ST.save_lastloc; |
| 4123 | cur_curlyx->u.curlyx.count--; |
| 4124 | CACHEsayNO; |
| 4125 | /* NOTREACHED */ |
| 4126 | |
| 4127 | case WHILEM_A_max_fail: /* just failed to match A in a maximal match */ |
| 4128 | REGCP_UNWIND(ST.lastcp); |
| 4129 | regcppop(rex); /* Restore some previous $<digit>s? */ |
| 4130 | PL_reginput = locinput; |
| 4131 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 4132 | "%*s whilem: failed, trying continuation...\n", |
| 4133 | REPORT_CODE_OFF+depth*2, "") |
| 4134 | ); |
| 4135 | do_whilem_B_max: |
| 4136 | if (cur_curlyx->u.curlyx.count >= REG_INFTY |
| 4137 | && ckWARN(WARN_REGEXP) |
| 4138 | && !(PL_reg_flags & RF_warned)) |
| 4139 | { |
| 4140 | PL_reg_flags |= RF_warned; |
| 4141 | Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s limit (%d) exceeded", |
| 4142 | "Complex regular subexpression recursion", |
| 4143 | REG_INFTY - 1); |
| 4144 | } |
| 4145 | |
| 4146 | /* now try B */ |
| 4147 | ST.save_curlyx = cur_curlyx; |
| 4148 | cur_curlyx = cur_curlyx->u.curlyx.prev_curlyx; |
| 4149 | PUSH_YES_STATE_GOTO(WHILEM_B_max, ST.save_curlyx->u.curlyx.B); |
| 4150 | /* NOTREACHED */ |
| 4151 | |
| 4152 | case WHILEM_B_min_fail: /* just failed to match B in a minimal match */ |
| 4153 | cur_curlyx = ST.save_curlyx; |
| 4154 | REGCP_UNWIND(ST.lastcp); |
| 4155 | regcppop(rex); |
| 4156 | |
| 4157 | if (cur_curlyx->u.curlyx.count >= cur_curlyx->u.curlyx.max) { |
| 4158 | /* Maximum greed exceeded */ |
| 4159 | if (cur_curlyx->u.curlyx.count >= REG_INFTY |
| 4160 | && ckWARN(WARN_REGEXP) |
| 4161 | && !(PL_reg_flags & RF_warned)) |
| 4162 | { |
| 4163 | PL_reg_flags |= RF_warned; |
| 4164 | Perl_warner(aTHX_ packWARN(WARN_REGEXP), |
| 4165 | "%s limit (%d) exceeded", |
| 4166 | "Complex regular subexpression recursion", |
| 4167 | REG_INFTY - 1); |
| 4168 | } |
| 4169 | cur_curlyx->u.curlyx.count--; |
| 4170 | CACHEsayNO; |
| 4171 | } |
| 4172 | |
| 4173 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 4174 | "%*s trying longer...\n", REPORT_CODE_OFF+depth*2, "") |
| 4175 | ); |
| 4176 | /* Try grabbing another A and see if it helps. */ |
| 4177 | PL_reginput = locinput; |
| 4178 | cur_curlyx->u.curlyx.lastloc = locinput; |
| 4179 | ST.cp = regcppush(cur_curlyx->u.curlyx.parenfloor); |
| 4180 | REGCP_SET(ST.lastcp); |
| 4181 | PUSH_STATE_GOTO(WHILEM_A_min, ST.save_curlyx->u.curlyx.A); |
| 4182 | /* NOTREACHED */ |
| 4183 | |
| 4184 | #undef ST |
| 4185 | #define ST st->u.branch |
| 4186 | |
| 4187 | case BRANCHJ: /* /(...|A|...)/ with long next pointer */ |
| 4188 | next = scan + ARG(scan); |
| 4189 | if (next == scan) |
| 4190 | next = NULL; |
| 4191 | scan = NEXTOPER(scan); |
| 4192 | /* FALL THROUGH */ |
| 4193 | |
| 4194 | case BRANCH: /* /(...|A|...)/ */ |
| 4195 | scan = NEXTOPER(scan); /* scan now points to inner node */ |
| 4196 | if ((!next || (OP(next) != BRANCH && OP(next) != BRANCHJ)) |
| 4197 | && !has_cutgroup) |
| 4198 | { |
| 4199 | /* last branch; skip state push and jump direct to node */ |
| 4200 | continue; |
| 4201 | } |
| 4202 | ST.lastparen = *PL_reglastparen; |
| 4203 | ST.next_branch = next; |
| 4204 | REGCP_SET(ST.cp); |
| 4205 | PL_reginput = locinput; |
| 4206 | |
| 4207 | /* Now go into the branch */ |
| 4208 | if (has_cutgroup) { |
| 4209 | PUSH_YES_STATE_GOTO(BRANCH_next, scan); |
| 4210 | } else { |
| 4211 | PUSH_STATE_GOTO(BRANCH_next, scan); |
| 4212 | } |
| 4213 | /* NOTREACHED */ |
| 4214 | case CUTGROUP: |
| 4215 | PL_reginput = locinput; |
| 4216 | sv_yes_mark = st->u.mark.mark_name = scan->flags ? NULL : |
| 4217 | (SV*)rexi->data->data[ ARG( scan ) ]; |
| 4218 | PUSH_STATE_GOTO(CUTGROUP_next,next); |
| 4219 | /* NOTREACHED */ |
| 4220 | case CUTGROUP_next_fail: |
| 4221 | do_cutgroup = 1; |
| 4222 | no_final = 1; |
| 4223 | if (st->u.mark.mark_name) |
| 4224 | sv_commit = st->u.mark.mark_name; |
| 4225 | sayNO; |
| 4226 | /* NOTREACHED */ |
| 4227 | case BRANCH_next: |
| 4228 | sayYES; |
| 4229 | /* NOTREACHED */ |
| 4230 | case BRANCH_next_fail: /* that branch failed; try the next, if any */ |
| 4231 | if (do_cutgroup) { |
| 4232 | do_cutgroup = 0; |
| 4233 | no_final = 0; |
| 4234 | } |
| 4235 | REGCP_UNWIND(ST.cp); |
| 4236 | for (n = *PL_reglastparen; n > ST.lastparen; n--) |
| 4237 | PL_regendp[n] = -1; |
| 4238 | *PL_reglastparen = n; |
| 4239 | /*dmq: *PL_reglastcloseparen = n; */ |
| 4240 | scan = ST.next_branch; |
| 4241 | /* no more branches? */ |
| 4242 | if (!scan || (OP(scan) != BRANCH && OP(scan) != BRANCHJ)) { |
| 4243 | DEBUG_EXECUTE_r({ |
| 4244 | PerlIO_printf( Perl_debug_log, |
| 4245 | "%*s %sBRANCH failed...%s\n", |
| 4246 | REPORT_CODE_OFF+depth*2, "", |
| 4247 | PL_colors[4], |
| 4248 | PL_colors[5] ); |
| 4249 | }); |
| 4250 | sayNO_SILENT; |
| 4251 | } |
| 4252 | continue; /* execute next BRANCH[J] op */ |
| 4253 | /* NOTREACHED */ |
| 4254 | |
| 4255 | case MINMOD: |
| 4256 | minmod = 1; |
| 4257 | break; |
| 4258 | |
| 4259 | #undef ST |
| 4260 | #define ST st->u.curlym |
| 4261 | |
| 4262 | case CURLYM: /* /A{m,n}B/ where A is fixed-length */ |
| 4263 | |
| 4264 | /* This is an optimisation of CURLYX that enables us to push |
| 4265 | * only a single backtracking state, no matter now many matches |
| 4266 | * there are in {m,n}. It relies on the pattern being constant |
| 4267 | * length, with no parens to influence future backrefs |
| 4268 | */ |
| 4269 | |
| 4270 | ST.me = scan; |
| 4271 | scan = NEXTOPER(scan) + NODE_STEP_REGNODE; |
| 4272 | |
| 4273 | /* if paren positive, emulate an OPEN/CLOSE around A */ |
| 4274 | if (ST.me->flags) { |
| 4275 | U32 paren = ST.me->flags; |
| 4276 | if (paren > PL_regsize) |
| 4277 | PL_regsize = paren; |
| 4278 | if (paren > *PL_reglastparen) |
| 4279 | *PL_reglastparen = paren; |
| 4280 | scan += NEXT_OFF(scan); /* Skip former OPEN. */ |
| 4281 | } |
| 4282 | ST.A = scan; |
| 4283 | ST.B = next; |
| 4284 | ST.alen = 0; |
| 4285 | ST.count = 0; |
| 4286 | ST.minmod = minmod; |
| 4287 | minmod = 0; |
| 4288 | ST.c1 = CHRTEST_UNINIT; |
| 4289 | REGCP_SET(ST.cp); |
| 4290 | |
| 4291 | if (!(ST.minmod ? ARG1(ST.me) : ARG2(ST.me))) /* min/max */ |
| 4292 | goto curlym_do_B; |
| 4293 | |
| 4294 | curlym_do_A: /* execute the A in /A{m,n}B/ */ |
| 4295 | PL_reginput = locinput; |
| 4296 | PUSH_YES_STATE_GOTO(CURLYM_A, ST.A); /* match A */ |
| 4297 | /* NOTREACHED */ |
| 4298 | |
| 4299 | case CURLYM_A: /* we've just matched an A */ |
| 4300 | locinput = st->locinput; |
| 4301 | nextchr = UCHARAT(locinput); |
| 4302 | |
| 4303 | ST.count++; |
| 4304 | /* after first match, determine A's length: u.curlym.alen */ |
| 4305 | if (ST.count == 1) { |
| 4306 | if (PL_reg_match_utf8) { |
| 4307 | char *s = locinput; |
| 4308 | while (s < PL_reginput) { |
| 4309 | ST.alen++; |
| 4310 | s += UTF8SKIP(s); |
| 4311 | } |
| 4312 | } |
| 4313 | else { |
| 4314 | ST.alen = PL_reginput - locinput; |
| 4315 | } |
| 4316 | if (ST.alen == 0) |
| 4317 | ST.count = ST.minmod ? ARG1(ST.me) : ARG2(ST.me); |
| 4318 | } |
| 4319 | DEBUG_EXECUTE_r( |
| 4320 | PerlIO_printf(Perl_debug_log, |
| 4321 | "%*s CURLYM now matched %"IVdf" times, len=%"IVdf"...\n", |
| 4322 | (int)(REPORT_CODE_OFF+(depth*2)), "", |
| 4323 | (IV) ST.count, (IV)ST.alen) |
| 4324 | ); |
| 4325 | |
| 4326 | locinput = PL_reginput; |
| 4327 | |
| 4328 | if (cur_eval && cur_eval->u.eval.close_paren && |
| 4329 | cur_eval->u.eval.close_paren == (U32)ST.me->flags) |
| 4330 | goto fake_end; |
| 4331 | |
| 4332 | if ( ST.count < (ST.minmod ? ARG1(ST.me) : ARG2(ST.me)) ) |
| 4333 | goto curlym_do_A; /* try to match another A */ |
| 4334 | goto curlym_do_B; /* try to match B */ |
| 4335 | |
| 4336 | case CURLYM_A_fail: /* just failed to match an A */ |
| 4337 | REGCP_UNWIND(ST.cp); |
| 4338 | |
| 4339 | if (ST.minmod || ST.count < ARG1(ST.me) /* min*/ |
| 4340 | || (cur_eval && cur_eval->u.eval.close_paren && |
| 4341 | cur_eval->u.eval.close_paren == (U32)ST.me->flags)) |
| 4342 | sayNO; |
| 4343 | |
| 4344 | curlym_do_B: /* execute the B in /A{m,n}B/ */ |
| 4345 | PL_reginput = locinput; |
| 4346 | if (ST.c1 == CHRTEST_UNINIT) { |
| 4347 | /* calculate c1 and c2 for possible match of 1st char |
| 4348 | * following curly */ |
| 4349 | ST.c1 = ST.c2 = CHRTEST_VOID; |
| 4350 | if (HAS_TEXT(ST.B) || JUMPABLE(ST.B)) { |
| 4351 | regnode *text_node = ST.B; |
| 4352 | if (! HAS_TEXT(text_node)) |
| 4353 | FIND_NEXT_IMPT(text_node); |
| 4354 | /* this used to be |
| 4355 | |
| 4356 | (HAS_TEXT(text_node) && PL_regkind[OP(text_node)] == EXACT) |
| 4357 | |
| 4358 | But the former is redundant in light of the latter. |
| 4359 | |
| 4360 | if this changes back then the macro for |
| 4361 | IS_TEXT and friends need to change. |
| 4362 | */ |
| 4363 | if (PL_regkind[OP(text_node)] == EXACT) |
| 4364 | { |
| 4365 | |
| 4366 | ST.c1 = (U8)*STRING(text_node); |
| 4367 | ST.c2 = |
| 4368 | (IS_TEXTF(text_node)) |
| 4369 | ? PL_fold[ST.c1] |
| 4370 | : (IS_TEXTFL(text_node)) |
| 4371 | ? PL_fold_locale[ST.c1] |
| 4372 | : ST.c1; |
| 4373 | } |
| 4374 | } |
| 4375 | } |
| 4376 | |
| 4377 | DEBUG_EXECUTE_r( |
| 4378 | PerlIO_printf(Perl_debug_log, |
| 4379 | "%*s CURLYM trying tail with matches=%"IVdf"...\n", |
| 4380 | (int)(REPORT_CODE_OFF+(depth*2)), |
| 4381 | "", (IV)ST.count) |
| 4382 | ); |
| 4383 | if (ST.c1 != CHRTEST_VOID |
| 4384 | && UCHARAT(PL_reginput) != ST.c1 |
| 4385 | && UCHARAT(PL_reginput) != ST.c2) |
| 4386 | { |
| 4387 | /* simulate B failing */ |
| 4388 | DEBUG_OPTIMISE_r( |
| 4389 | PerlIO_printf(Perl_debug_log, |
| 4390 | "%*s CURLYM Fast bail c1=%"IVdf" c2=%"IVdf"\n", |
| 4391 | (int)(REPORT_CODE_OFF+(depth*2)),"", |
| 4392 | (IV)ST.c1,(IV)ST.c2 |
| 4393 | )); |
| 4394 | state_num = CURLYM_B_fail; |
| 4395 | goto reenter_switch; |
| 4396 | } |
| 4397 | |
| 4398 | if (ST.me->flags) { |
| 4399 | /* mark current A as captured */ |
| 4400 | I32 paren = ST.me->flags; |
| 4401 | if (ST.count) { |
| 4402 | PL_regstartp[paren] |
| 4403 | = HOPc(PL_reginput, -ST.alen) - PL_bostr; |
| 4404 | PL_regendp[paren] = PL_reginput - PL_bostr; |
| 4405 | /*dmq: *PL_reglastcloseparen = paren; */ |
| 4406 | } |
| 4407 | else |
| 4408 | PL_regendp[paren] = -1; |
| 4409 | if (cur_eval && cur_eval->u.eval.close_paren && |
| 4410 | cur_eval->u.eval.close_paren == (U32)ST.me->flags) |
| 4411 | { |
| 4412 | if (ST.count) |
| 4413 | goto fake_end; |
| 4414 | else |
| 4415 | sayNO; |
| 4416 | } |
| 4417 | } |
| 4418 | |
| 4419 | PUSH_STATE_GOTO(CURLYM_B, ST.B); /* match B */ |
| 4420 | /* NOTREACHED */ |
| 4421 | |
| 4422 | case CURLYM_B_fail: /* just failed to match a B */ |
| 4423 | REGCP_UNWIND(ST.cp); |
| 4424 | if (ST.minmod) { |
| 4425 | if (ST.count == ARG2(ST.me) /* max */) |
| 4426 | sayNO; |
| 4427 | goto curlym_do_A; /* try to match a further A */ |
| 4428 | } |
| 4429 | /* backtrack one A */ |
| 4430 | if (ST.count == ARG1(ST.me) /* min */) |
| 4431 | sayNO; |
| 4432 | ST.count--; |
| 4433 | locinput = HOPc(locinput, -ST.alen); |
| 4434 | goto curlym_do_B; /* try to match B */ |
| 4435 | |
| 4436 | #undef ST |
| 4437 | #define ST st->u.curly |
| 4438 | |
| 4439 | #define CURLY_SETPAREN(paren, success) \ |
| 4440 | if (paren) { \ |
| 4441 | if (success) { \ |
| 4442 | PL_regstartp[paren] = HOPc(locinput, -1) - PL_bostr; \ |
| 4443 | PL_regendp[paren] = locinput - PL_bostr; \ |
| 4444 | *PL_reglastcloseparen = paren; \ |
| 4445 | } \ |
| 4446 | else \ |
| 4447 | PL_regendp[paren] = -1; \ |
| 4448 | } |
| 4449 | |
| 4450 | case STAR: /* /A*B/ where A is width 1 */ |
| 4451 | ST.paren = 0; |
| 4452 | ST.min = 0; |
| 4453 | ST.max = REG_INFTY; |
| 4454 | scan = NEXTOPER(scan); |
| 4455 | goto repeat; |
| 4456 | case PLUS: /* /A+B/ where A is width 1 */ |
| 4457 | ST.paren = 0; |
| 4458 | ST.min = 1; |
| 4459 | ST.max = REG_INFTY; |
| 4460 | scan = NEXTOPER(scan); |
| 4461 | goto repeat; |
| 4462 | case CURLYN: /* /(A){m,n}B/ where A is width 1 */ |
| 4463 | ST.paren = scan->flags; /* Which paren to set */ |
| 4464 | if (ST.paren > PL_regsize) |
| 4465 | PL_regsize = ST.paren; |
| 4466 | if (ST.paren > *PL_reglastparen) |
| 4467 | *PL_reglastparen = ST.paren; |
| 4468 | ST.min = ARG1(scan); /* min to match */ |
| 4469 | ST.max = ARG2(scan); /* max to match */ |
| 4470 | if (cur_eval && cur_eval->u.eval.close_paren && |
| 4471 | cur_eval->u.eval.close_paren == (U32)ST.paren) { |
| 4472 | ST.min=1; |
| 4473 | ST.max=1; |
| 4474 | } |
| 4475 | scan = regnext(NEXTOPER(scan) + NODE_STEP_REGNODE); |
| 4476 | goto repeat; |
| 4477 | case CURLY: /* /A{m,n}B/ where A is width 1 */ |
| 4478 | ST.paren = 0; |
| 4479 | ST.min = ARG1(scan); /* min to match */ |
| 4480 | ST.max = ARG2(scan); /* max to match */ |
| 4481 | scan = NEXTOPER(scan) + NODE_STEP_REGNODE; |
| 4482 | repeat: |
| 4483 | /* |
| 4484 | * Lookahead to avoid useless match attempts |
| 4485 | * when we know what character comes next. |
| 4486 | * |
| 4487 | * Used to only do .*x and .*?x, but now it allows |
| 4488 | * for )'s, ('s and (?{ ... })'s to be in the way |
| 4489 | * of the quantifier and the EXACT-like node. -- japhy |
| 4490 | */ |
| 4491 | |
| 4492 | if (ST.min > ST.max) /* XXX make this a compile-time check? */ |
| 4493 | sayNO; |
| 4494 | if (HAS_TEXT(next) || JUMPABLE(next)) { |
| 4495 | U8 *s; |
| 4496 | regnode *text_node = next; |
| 4497 | |
| 4498 | if (! HAS_TEXT(text_node)) |
| 4499 | FIND_NEXT_IMPT(text_node); |
| 4500 | |
| 4501 | if (! HAS_TEXT(text_node)) |
| 4502 | ST.c1 = ST.c2 = CHRTEST_VOID; |
| 4503 | else { |
| 4504 | if ( PL_regkind[OP(text_node)] != EXACT ) { |
| 4505 | ST.c1 = ST.c2 = CHRTEST_VOID; |
| 4506 | goto assume_ok_easy; |
| 4507 | } |
| 4508 | else |
| 4509 | s = (U8*)STRING(text_node); |
| 4510 | |
| 4511 | /* Currently we only get here when |
| 4512 | |
| 4513 | PL_rekind[OP(text_node)] == EXACT |
| 4514 | |
| 4515 | if this changes back then the macro for IS_TEXT and |
| 4516 | friends need to change. */ |
| 4517 | if (!UTF) { |
| 4518 | ST.c2 = ST.c1 = *s; |
| 4519 | if (IS_TEXTF(text_node)) |
| 4520 | ST.c2 = PL_fold[ST.c1]; |
| 4521 | else if (IS_TEXTFL(text_node)) |
| 4522 | ST.c2 = PL_fold_locale[ST.c1]; |
| 4523 | } |
| 4524 | else { /* UTF */ |
| 4525 | if (IS_TEXTF(text_node)) { |
| 4526 | STRLEN ulen1, ulen2; |
| 4527 | U8 tmpbuf1[UTF8_MAXBYTES_CASE+1]; |
| 4528 | U8 tmpbuf2[UTF8_MAXBYTES_CASE+1]; |
| 4529 | |
| 4530 | to_utf8_lower((U8*)s, tmpbuf1, &ulen1); |
| 4531 | to_utf8_upper((U8*)s, tmpbuf2, &ulen2); |
| 4532 | #ifdef EBCDIC |
| 4533 | ST.c1 = utf8n_to_uvchr(tmpbuf1, UTF8_MAXLEN, 0, |
| 4534 | ckWARN(WARN_UTF8) ? |
| 4535 | 0 : UTF8_ALLOW_ANY); |
| 4536 | ST.c2 = utf8n_to_uvchr(tmpbuf2, UTF8_MAXLEN, 0, |
| 4537 | ckWARN(WARN_UTF8) ? |
| 4538 | 0 : UTF8_ALLOW_ANY); |
| 4539 | #else |
| 4540 | ST.c1 = utf8n_to_uvuni(tmpbuf1, UTF8_MAXBYTES, 0, |
| 4541 | uniflags); |
| 4542 | ST.c2 = utf8n_to_uvuni(tmpbuf2, UTF8_MAXBYTES, 0, |
| 4543 | uniflags); |
| 4544 | #endif |
| 4545 | } |
| 4546 | else { |
| 4547 | ST.c2 = ST.c1 = utf8n_to_uvchr(s, UTF8_MAXBYTES, 0, |
| 4548 | uniflags); |
| 4549 | } |
| 4550 | } |
| 4551 | } |
| 4552 | } |
| 4553 | else |
| 4554 | ST.c1 = ST.c2 = CHRTEST_VOID; |
| 4555 | assume_ok_easy: |
| 4556 | |
| 4557 | ST.A = scan; |
| 4558 | ST.B = next; |
| 4559 | PL_reginput = locinput; |
| 4560 | if (minmod) { |
| 4561 | minmod = 0; |
| 4562 | if (ST.min && regrepeat(rex, ST.A, ST.min, depth) < ST.min) |
| 4563 | sayNO; |
| 4564 | ST.count = ST.min; |
| 4565 | locinput = PL_reginput; |
| 4566 | REGCP_SET(ST.cp); |
| 4567 | if (ST.c1 == CHRTEST_VOID) |
| 4568 | goto curly_try_B_min; |
| 4569 | |
| 4570 | ST.oldloc = locinput; |
| 4571 | |
| 4572 | /* set ST.maxpos to the furthest point along the |
| 4573 | * string that could possibly match */ |
| 4574 | if (ST.max == REG_INFTY) { |
| 4575 | ST.maxpos = PL_regeol - 1; |
| 4576 | if (do_utf8) |
| 4577 | while (UTF8_IS_CONTINUATION(*(U8*)ST.maxpos)) |
| 4578 | ST.maxpos--; |
| 4579 | } |
| 4580 | else if (do_utf8) { |
| 4581 | int m = ST.max - ST.min; |
| 4582 | for (ST.maxpos = locinput; |
| 4583 | m >0 && ST.maxpos + UTF8SKIP(ST.maxpos) <= PL_regeol; m--) |
| 4584 | ST.maxpos += UTF8SKIP(ST.maxpos); |
| 4585 | } |
| 4586 | else { |
| 4587 | ST.maxpos = locinput + ST.max - ST.min; |
| 4588 | if (ST.maxpos >= PL_regeol) |
| 4589 | ST.maxpos = PL_regeol - 1; |
| 4590 | } |
| 4591 | goto curly_try_B_min_known; |
| 4592 | |
| 4593 | } |
| 4594 | else { |
| 4595 | ST.count = regrepeat(rex, ST.A, ST.max, depth); |
| 4596 | locinput = PL_reginput; |
| 4597 | if (ST.count < ST.min) |
| 4598 | sayNO; |
| 4599 | if ((ST.count > ST.min) |
| 4600 | && (PL_regkind[OP(ST.B)] == EOL) && (OP(ST.B) != MEOL)) |
| 4601 | { |
| 4602 | /* A{m,n} must come at the end of the string, there's |
| 4603 | * no point in backing off ... */ |
| 4604 | ST.min = ST.count; |
| 4605 | /* ...except that $ and \Z can match before *and* after |
| 4606 | newline at the end. Consider "\n\n" =~ /\n+\Z\n/. |
| 4607 | We may back off by one in this case. */ |
| 4608 | if (UCHARAT(PL_reginput - 1) == '\n' && OP(ST.B) != EOS) |
| 4609 | ST.min--; |
| 4610 | } |
| 4611 | REGCP_SET(ST.cp); |
| 4612 | goto curly_try_B_max; |
| 4613 | } |
| 4614 | /* NOTREACHED */ |
| 4615 | |
| 4616 | |
| 4617 | case CURLY_B_min_known_fail: |
| 4618 | /* failed to find B in a non-greedy match where c1,c2 valid */ |
| 4619 | if (ST.paren && ST.count) |
| 4620 | PL_regendp[ST.paren] = -1; |
| 4621 | |
| 4622 | PL_reginput = locinput; /* Could be reset... */ |
| 4623 | REGCP_UNWIND(ST.cp); |
| 4624 | /* Couldn't or didn't -- move forward. */ |
| 4625 | ST.oldloc = locinput; |
| 4626 | if (do_utf8) |
| 4627 | locinput += UTF8SKIP(locinput); |
| 4628 | else |
| 4629 | locinput++; |
| 4630 | ST.count++; |
| 4631 | curly_try_B_min_known: |
| 4632 | /* find the next place where 'B' could work, then call B */ |
| 4633 | { |
| 4634 | int n; |
| 4635 | if (do_utf8) { |
| 4636 | n = (ST.oldloc == locinput) ? 0 : 1; |
| 4637 | if (ST.c1 == ST.c2) { |
| 4638 | STRLEN len; |
| 4639 | /* set n to utf8_distance(oldloc, locinput) */ |
| 4640 | while (locinput <= ST.maxpos && |
| 4641 | utf8n_to_uvchr((U8*)locinput, |
| 4642 | UTF8_MAXBYTES, &len, |
| 4643 | uniflags) != (UV)ST.c1) { |
| 4644 | locinput += len; |
| 4645 | n++; |
| 4646 | } |
| 4647 | } |
| 4648 | else { |
| 4649 | /* set n to utf8_distance(oldloc, locinput) */ |
| 4650 | while (locinput <= ST.maxpos) { |
| 4651 | STRLEN len; |
| 4652 | const UV c = utf8n_to_uvchr((U8*)locinput, |
| 4653 | UTF8_MAXBYTES, &len, |
| 4654 | uniflags); |
| 4655 | if (c == (UV)ST.c1 || c == (UV)ST.c2) |
| 4656 | break; |
| 4657 | locinput += len; |
| 4658 | n++; |
| 4659 | } |
| 4660 | } |
| 4661 | } |
| 4662 | else { |
| 4663 | if (ST.c1 == ST.c2) { |
| 4664 | while (locinput <= ST.maxpos && |
| 4665 | UCHARAT(locinput) != ST.c1) |
| 4666 | locinput++; |
| 4667 | } |
| 4668 | else { |
| 4669 | while (locinput <= ST.maxpos |
| 4670 | && UCHARAT(locinput) != ST.c1 |
| 4671 | && UCHARAT(locinput) != ST.c2) |
| 4672 | locinput++; |
| 4673 | } |
| 4674 | n = locinput - ST.oldloc; |
| 4675 | } |
| 4676 | if (locinput > ST.maxpos) |
| 4677 | sayNO; |
| 4678 | /* PL_reginput == oldloc now */ |
| 4679 | if (n) { |
| 4680 | ST.count += n; |
| 4681 | if (regrepeat(rex, ST.A, n, depth) < n) |
| 4682 | sayNO; |
| 4683 | } |
| 4684 | PL_reginput = locinput; |
| 4685 | CURLY_SETPAREN(ST.paren, ST.count); |
| 4686 | if (cur_eval && cur_eval->u.eval.close_paren && |
| 4687 | cur_eval->u.eval.close_paren == (U32)ST.paren) { |
| 4688 | goto fake_end; |
| 4689 | } |
| 4690 | PUSH_STATE_GOTO(CURLY_B_min_known, ST.B); |
| 4691 | } |
| 4692 | /* NOTREACHED */ |
| 4693 | |
| 4694 | |
| 4695 | case CURLY_B_min_fail: |
| 4696 | /* failed to find B in a non-greedy match where c1,c2 invalid */ |
| 4697 | if (ST.paren && ST.count) |
| 4698 | PL_regendp[ST.paren] = -1; |
| 4699 | |
| 4700 | REGCP_UNWIND(ST.cp); |
| 4701 | /* failed -- move forward one */ |
| 4702 | PL_reginput = locinput; |
| 4703 | if (regrepeat(rex, ST.A, 1, depth)) { |
| 4704 | ST.count++; |
| 4705 | locinput = PL_reginput; |
| 4706 | if (ST.count <= ST.max || (ST.max == REG_INFTY && |
| 4707 | ST.count > 0)) /* count overflow ? */ |
| 4708 | { |
| 4709 | curly_try_B_min: |
| 4710 | CURLY_SETPAREN(ST.paren, ST.count); |
| 4711 | if (cur_eval && cur_eval->u.eval.close_paren && |
| 4712 | cur_eval->u.eval.close_paren == (U32)ST.paren) { |
| 4713 | goto fake_end; |
| 4714 | } |
| 4715 | PUSH_STATE_GOTO(CURLY_B_min, ST.B); |
| 4716 | } |
| 4717 | } |
| 4718 | sayNO; |
| 4719 | /* NOTREACHED */ |
| 4720 | |
| 4721 | |
| 4722 | curly_try_B_max: |
| 4723 | /* a successful greedy match: now try to match B */ |
| 4724 | if (cur_eval && cur_eval->u.eval.close_paren && |
| 4725 | cur_eval->u.eval.close_paren == (U32)ST.paren) { |
| 4726 | goto fake_end; |
| 4727 | } |
| 4728 | { |
| 4729 | UV c = 0; |
| 4730 | if (ST.c1 != CHRTEST_VOID) |
| 4731 | c = do_utf8 ? utf8n_to_uvchr((U8*)PL_reginput, |
| 4732 | UTF8_MAXBYTES, 0, uniflags) |
| 4733 | : (UV) UCHARAT(PL_reginput); |
| 4734 | /* If it could work, try it. */ |
| 4735 | if (ST.c1 == CHRTEST_VOID || c == (UV)ST.c1 || c == (UV)ST.c2) { |
| 4736 | CURLY_SETPAREN(ST.paren, ST.count); |
| 4737 | PUSH_STATE_GOTO(CURLY_B_max, ST.B); |
| 4738 | /* NOTREACHED */ |
| 4739 | } |
| 4740 | } |
| 4741 | /* FALL THROUGH */ |
| 4742 | case CURLY_B_max_fail: |
| 4743 | /* failed to find B in a greedy match */ |
| 4744 | if (ST.paren && ST.count) |
| 4745 | PL_regendp[ST.paren] = -1; |
| 4746 | |
| 4747 | REGCP_UNWIND(ST.cp); |
| 4748 | /* back up. */ |
| 4749 | if (--ST.count < ST.min) |
| 4750 | sayNO; |
| 4751 | PL_reginput = locinput = HOPc(locinput, -1); |
| 4752 | goto curly_try_B_max; |
| 4753 | |
| 4754 | #undef ST |
| 4755 | |
| 4756 | case END: |
| 4757 | fake_end: |
| 4758 | if (cur_eval) { |
| 4759 | /* we've just finished A in /(??{A})B/; now continue with B */ |
| 4760 | I32 tmpix; |
| 4761 | st->u.eval.toggle_reg_flags |
| 4762 | = cur_eval->u.eval.toggle_reg_flags; |
| 4763 | PL_reg_flags ^= st->u.eval.toggle_reg_flags; |
| 4764 | |
| 4765 | st->u.eval.prev_rex = rex; /* inner */ |
| 4766 | SETREX(rex,cur_eval->u.eval.prev_rex); |
| 4767 | rexi = RXi_GET(rex); |
| 4768 | cur_curlyx = cur_eval->u.eval.prev_curlyx; |
| 4769 | ReREFCNT_inc(rex); |
| 4770 | st->u.eval.cp = regcppush(0); /* Save *all* the positions. */ |
| 4771 | REGCP_SET(st->u.eval.lastcp); |
| 4772 | PL_reginput = locinput; |
| 4773 | |
| 4774 | /* Restore parens of the outer rex without popping the |
| 4775 | * savestack */ |
| 4776 | tmpix = PL_savestack_ix; |
| 4777 | PL_savestack_ix = cur_eval->u.eval.lastcp; |
| 4778 | regcppop(rex); |
| 4779 | PL_savestack_ix = tmpix; |
| 4780 | |
| 4781 | st->u.eval.prev_eval = cur_eval; |
| 4782 | cur_eval = cur_eval->u.eval.prev_eval; |
| 4783 | DEBUG_EXECUTE_r( |
| 4784 | PerlIO_printf(Perl_debug_log, "%*s EVAL trying tail ... %"UVxf"\n", |
| 4785 | REPORT_CODE_OFF+depth*2, "",PTR2UV(cur_eval));); |
| 4786 | if ( nochange_depth ) |
| 4787 | nochange_depth--; |
| 4788 | |
| 4789 | PUSH_YES_STATE_GOTO(EVAL_AB, |
| 4790 | st->u.eval.prev_eval->u.eval.B); /* match B */ |
| 4791 | } |
| 4792 | |
| 4793 | if (locinput < reginfo->till) { |
| 4794 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, |
| 4795 | "%sMatch possible, but length=%ld is smaller than requested=%ld, failing!%s\n", |
| 4796 | PL_colors[4], |
| 4797 | (long)(locinput - PL_reg_starttry), |
| 4798 | (long)(reginfo->till - PL_reg_starttry), |
| 4799 | PL_colors[5])); |
| 4800 | |
| 4801 | sayNO_SILENT; /* Cannot match: too short. */ |
| 4802 | } |
| 4803 | PL_reginput = locinput; /* put where regtry can find it */ |
| 4804 | sayYES; /* Success! */ |
| 4805 | |
| 4806 | case SUCCEED: /* successful SUSPEND/UNLESSM/IFMATCH/CURLYM */ |
| 4807 | DEBUG_EXECUTE_r( |
| 4808 | PerlIO_printf(Perl_debug_log, |
| 4809 | "%*s %ssubpattern success...%s\n", |
| 4810 | REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5])); |
| 4811 | PL_reginput = locinput; /* put where regtry can find it */ |
| 4812 | sayYES; /* Success! */ |
| 4813 | |
| 4814 | #undef ST |
| 4815 | #define ST st->u.ifmatch |
| 4816 | |
| 4817 | case SUSPEND: /* (?>A) */ |
| 4818 | ST.wanted = 1; |
| 4819 | PL_reginput = locinput; |
| 4820 | goto do_ifmatch; |
| 4821 | |
| 4822 | case UNLESSM: /* -ve lookaround: (?!A), or with flags, (?<!A) */ |
| 4823 | ST.wanted = 0; |
| 4824 | goto ifmatch_trivial_fail_test; |
| 4825 | |
| 4826 | case IFMATCH: /* +ve lookaround: (?=A), or with flags, (?<=A) */ |
| 4827 | ST.wanted = 1; |
| 4828 | ifmatch_trivial_fail_test: |
| 4829 | if (scan->flags) { |
| 4830 | char * const s = HOPBACKc(locinput, scan->flags); |
| 4831 | if (!s) { |
| 4832 | /* trivial fail */ |
| 4833 | if (logical) { |
| 4834 | logical = 0; |
| 4835 | sw = 1 - (bool)ST.wanted; |
| 4836 | } |
| 4837 | else if (ST.wanted) |
| 4838 | sayNO; |
| 4839 | next = scan + ARG(scan); |
| 4840 | if (next == scan) |
| 4841 | next = NULL; |
| 4842 | break; |
| 4843 | } |
| 4844 | PL_reginput = s; |
| 4845 | } |
| 4846 | else |
| 4847 | PL_reginput = locinput; |
| 4848 | |
| 4849 | do_ifmatch: |
| 4850 | ST.me = scan; |
| 4851 | ST.logical = logical; |
| 4852 | /* execute body of (?...A) */ |
| 4853 | PUSH_YES_STATE_GOTO(IFMATCH_A, NEXTOPER(NEXTOPER(scan))); |
| 4854 | /* NOTREACHED */ |
| 4855 | |
| 4856 | case IFMATCH_A_fail: /* body of (?...A) failed */ |
| 4857 | ST.wanted = !ST.wanted; |
| 4858 | /* FALL THROUGH */ |
| 4859 | |
| 4860 | case IFMATCH_A: /* body of (?...A) succeeded */ |
| 4861 | if (ST.logical) { |
| 4862 | sw = (bool)ST.wanted; |
| 4863 | } |
| 4864 | else if (!ST.wanted) |
| 4865 | sayNO; |
| 4866 | |
| 4867 | if (OP(ST.me) == SUSPEND) |
| 4868 | locinput = PL_reginput; |
| 4869 | else { |
| 4870 | locinput = PL_reginput = st->locinput; |
| 4871 | nextchr = UCHARAT(locinput); |
| 4872 | } |
| 4873 | scan = ST.me + ARG(ST.me); |
| 4874 | if (scan == ST.me) |
| 4875 | scan = NULL; |
| 4876 | continue; /* execute B */ |
| 4877 | |
| 4878 | #undef ST |
| 4879 | |
| 4880 | case LONGJMP: |
| 4881 | next = scan + ARG(scan); |
| 4882 | if (next == scan) |
| 4883 | next = NULL; |
| 4884 | break; |
| 4885 | case COMMIT: |
| 4886 | reginfo->cutpoint = PL_regeol; |
| 4887 | /* FALLTHROUGH */ |
| 4888 | case PRUNE: |
| 4889 | PL_reginput = locinput; |
| 4890 | if (!scan->flags) |
| 4891 | sv_yes_mark = sv_commit = (SV*)rexi->data->data[ ARG( scan ) ]; |
| 4892 | PUSH_STATE_GOTO(COMMIT_next,next); |
| 4893 | /* NOTREACHED */ |
| 4894 | case COMMIT_next_fail: |
| 4895 | no_final = 1; |
| 4896 | /* FALLTHROUGH */ |
| 4897 | case OPFAIL: |
| 4898 | sayNO; |
| 4899 | /* NOTREACHED */ |
| 4900 | |
| 4901 | #define ST st->u.mark |
| 4902 | case MARKPOINT: |
| 4903 | ST.prev_mark = mark_state; |
| 4904 | ST.mark_name = sv_commit = sv_yes_mark |
| 4905 | = (SV*)rexi->data->data[ ARG( scan ) ]; |
| 4906 | mark_state = st; |
| 4907 | ST.mark_loc = PL_reginput = locinput; |
| 4908 | PUSH_YES_STATE_GOTO(MARKPOINT_next,next); |
| 4909 | /* NOTREACHED */ |
| 4910 | case MARKPOINT_next: |
| 4911 | mark_state = ST.prev_mark; |
| 4912 | sayYES; |
| 4913 | /* NOTREACHED */ |
| 4914 | case MARKPOINT_next_fail: |
| 4915 | if (popmark && sv_eq(ST.mark_name,popmark)) |
| 4916 | { |
| 4917 | if (ST.mark_loc > startpoint) |
| 4918 | reginfo->cutpoint = HOPBACKc(ST.mark_loc, 1); |
| 4919 | popmark = NULL; /* we found our mark */ |
| 4920 | sv_commit = ST.mark_name; |
| 4921 | |
| 4922 | DEBUG_EXECUTE_r({ |
| 4923 | PerlIO_printf(Perl_debug_log, |
| 4924 | "%*s %ssetting cutpoint to mark:%"SVf"...%s\n", |
| 4925 | REPORT_CODE_OFF+depth*2, "", |
| 4926 | PL_colors[4], SVfARG(sv_commit), PL_colors[5]); |
| 4927 | }); |
| 4928 | } |
| 4929 | mark_state = ST.prev_mark; |
| 4930 | sv_yes_mark = mark_state ? |
| 4931 | mark_state->u.mark.mark_name : NULL; |
| 4932 | sayNO; |
| 4933 | /* NOTREACHED */ |
| 4934 | case SKIP: |
| 4935 | PL_reginput = locinput; |
| 4936 | if (scan->flags) { |
| 4937 | /* (*SKIP) : if we fail we cut here*/ |
| 4938 | ST.mark_name = NULL; |
| 4939 | ST.mark_loc = locinput; |
| 4940 | PUSH_STATE_GOTO(SKIP_next,next); |
| 4941 | } else { |
| 4942 | /* (*SKIP:NAME) : if there is a (*MARK:NAME) fail where it was, |
| 4943 | otherwise do nothing. Meaning we need to scan |
| 4944 | */ |
| 4945 | regmatch_state *cur = mark_state; |
| 4946 | SV *find = (SV*)rexi->data->data[ ARG( scan ) ]; |
| 4947 | |
| 4948 | while (cur) { |
| 4949 | if ( sv_eq( cur->u.mark.mark_name, |
| 4950 | find ) ) |
| 4951 | { |
| 4952 | ST.mark_name = find; |
| 4953 | PUSH_STATE_GOTO( SKIP_next, next ); |
| 4954 | } |
| 4955 | cur = cur->u.mark.prev_mark; |
| 4956 | } |
| 4957 | } |
| 4958 | /* Didn't find our (*MARK:NAME) so ignore this (*SKIP:NAME) */ |
| 4959 | break; |
| 4960 | case SKIP_next_fail: |
| 4961 | if (ST.mark_name) { |
| 4962 | /* (*CUT:NAME) - Set up to search for the name as we |
| 4963 | collapse the stack*/ |
| 4964 | popmark = ST.mark_name; |
| 4965 | } else { |
| 4966 | /* (*CUT) - No name, we cut here.*/ |
| 4967 | if (ST.mark_loc > startpoint) |
| 4968 | reginfo->cutpoint = HOPBACKc(ST.mark_loc, 1); |
| 4969 | /* but we set sv_commit to latest mark_name if there |
| 4970 | is one so they can test to see how things lead to this |
| 4971 | cut */ |
| 4972 | if (mark_state) |
| 4973 | sv_commit=mark_state->u.mark.mark_name; |
| 4974 | } |
| 4975 | no_final = 1; |
| 4976 | sayNO; |
| 4977 | /* NOTREACHED */ |
| 4978 | #undef ST |
| 4979 | |
| 4980 | default: |
| 4981 | PerlIO_printf(Perl_error_log, "%"UVxf" %d\n", |
| 4982 | PTR2UV(scan), OP(scan)); |
| 4983 | Perl_croak(aTHX_ "regexp memory corruption"); |
| 4984 | |
| 4985 | } /* end switch */ |
| 4986 | |
| 4987 | /* switch break jumps here */ |
| 4988 | scan = next; /* prepare to execute the next op and ... */ |
| 4989 | continue; /* ... jump back to the top, reusing st */ |
| 4990 | /* NOTREACHED */ |
| 4991 | |
| 4992 | push_yes_state: |
| 4993 | /* push a state that backtracks on success */ |
| 4994 | st->u.yes.prev_yes_state = yes_state; |
| 4995 | yes_state = st; |
| 4996 | /* FALL THROUGH */ |
| 4997 | push_state: |
| 4998 | /* push a new regex state, then continue at scan */ |
| 4999 | { |
| 5000 | regmatch_state *newst; |
| 5001 | |
| 5002 | DEBUG_STACK_r({ |
| 5003 | regmatch_state *cur = st; |
| 5004 | regmatch_state *curyes = yes_state; |
| 5005 | int curd = depth; |
| 5006 | regmatch_slab *slab = PL_regmatch_slab; |
| 5007 | for (;curd > -1;cur--,curd--) { |
| 5008 | if (cur < SLAB_FIRST(slab)) { |
| 5009 | slab = slab->prev; |
| 5010 | cur = SLAB_LAST(slab); |
| 5011 | } |
| 5012 | PerlIO_printf(Perl_error_log, "%*s#%-3d %-10s %s\n", |
| 5013 | REPORT_CODE_OFF + 2 + depth * 2,"", |
| 5014 | curd, PL_reg_name[cur->resume_state], |
| 5015 | (curyes == cur) ? "yes" : "" |
| 5016 | ); |
| 5017 | if (curyes == cur) |
| 5018 | curyes = cur->u.yes.prev_yes_state; |
| 5019 | } |
| 5020 | } else |
| 5021 | DEBUG_STATE_pp("push") |
| 5022 | ); |
| 5023 | depth++; |
| 5024 | st->locinput = locinput; |
| 5025 | newst = st+1; |
| 5026 | if (newst > SLAB_LAST(PL_regmatch_slab)) |
| 5027 | newst = S_push_slab(aTHX); |
| 5028 | PL_regmatch_state = newst; |
| 5029 | |
| 5030 | locinput = PL_reginput; |
| 5031 | nextchr = UCHARAT(locinput); |
| 5032 | st = newst; |
| 5033 | continue; |
| 5034 | /* NOTREACHED */ |
| 5035 | } |
| 5036 | } |
| 5037 | |
| 5038 | /* |
| 5039 | * We get here only if there's trouble -- normally "case END" is |
| 5040 | * the terminating point. |
| 5041 | */ |
| 5042 | Perl_croak(aTHX_ "corrupted regexp pointers"); |
| 5043 | /*NOTREACHED*/ |
| 5044 | sayNO; |
| 5045 | |
| 5046 | yes: |
| 5047 | if (yes_state) { |
| 5048 | /* we have successfully completed a subexpression, but we must now |
| 5049 | * pop to the state marked by yes_state and continue from there */ |
| 5050 | assert(st != yes_state); |
| 5051 | #ifdef DEBUGGING |
| 5052 | while (st != yes_state) { |
| 5053 | st--; |
| 5054 | if (st < SLAB_FIRST(PL_regmatch_slab)) { |
| 5055 | PL_regmatch_slab = PL_regmatch_slab->prev; |
| 5056 | st = SLAB_LAST(PL_regmatch_slab); |
| 5057 | } |
| 5058 | DEBUG_STATE_r({ |
| 5059 | if (no_final) { |
| 5060 | DEBUG_STATE_pp("pop (no final)"); |
| 5061 | } else { |
| 5062 | DEBUG_STATE_pp("pop (yes)"); |
| 5063 | } |
| 5064 | }); |
| 5065 | depth--; |
| 5066 | } |
| 5067 | #else |
| 5068 | while (yes_state < SLAB_FIRST(PL_regmatch_slab) |
| 5069 | || yes_state > SLAB_LAST(PL_regmatch_slab)) |
| 5070 | { |
| 5071 | /* not in this slab, pop slab */ |
| 5072 | depth -= (st - SLAB_FIRST(PL_regmatch_slab) + 1); |
| 5073 | PL_regmatch_slab = PL_regmatch_slab->prev; |
| 5074 | st = SLAB_LAST(PL_regmatch_slab); |
| 5075 | } |
| 5076 | depth -= (st - yes_state); |
| 5077 | #endif |
| 5078 | st = yes_state; |
| 5079 | yes_state = st->u.yes.prev_yes_state; |
| 5080 | PL_regmatch_state = st; |
| 5081 | |
| 5082 | if (no_final) { |
| 5083 | locinput= st->locinput; |
| 5084 | nextchr = UCHARAT(locinput); |
| 5085 | } |
| 5086 | state_num = st->resume_state + no_final; |
| 5087 | goto reenter_switch; |
| 5088 | } |
| 5089 | |
| 5090 | DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch successful!%s\n", |
| 5091 | PL_colors[4], PL_colors[5])); |
| 5092 | |
| 5093 | result = 1; |
| 5094 | goto final_exit; |
| 5095 | |
| 5096 | no: |
| 5097 | DEBUG_EXECUTE_r( |
| 5098 | PerlIO_printf(Perl_debug_log, |
| 5099 | "%*s %sfailed...%s\n", |
| 5100 | REPORT_CODE_OFF+depth*2, "", |
| 5101 | PL_colors[4], PL_colors[5]) |
| 5102 | ); |
| 5103 | |
| 5104 | no_silent: |
| 5105 | if (no_final) { |
| 5106 | if (yes_state) { |
| 5107 | goto yes; |
| 5108 | } else { |
| 5109 | goto final_exit; |
| 5110 | } |
| 5111 | } |
| 5112 | if (depth) { |
| 5113 | /* there's a previous state to backtrack to */ |
| 5114 | st--; |
| 5115 | if (st < SLAB_FIRST(PL_regmatch_slab)) { |
| 5116 | PL_regmatch_slab = PL_regmatch_slab->prev; |
| 5117 | st = SLAB_LAST(PL_regmatch_slab); |
| 5118 | } |
| 5119 | PL_regmatch_state = st; |
| 5120 | locinput= st->locinput; |
| 5121 | nextchr = UCHARAT(locinput); |
| 5122 | |
| 5123 | DEBUG_STATE_pp("pop"); |
| 5124 | depth--; |
| 5125 | if (yes_state == st) |
| 5126 | yes_state = st->u.yes.prev_yes_state; |
| 5127 | |
| 5128 | state_num = st->resume_state + 1; /* failure = success + 1 */ |
| 5129 | goto reenter_switch; |
| 5130 | } |
| 5131 | result = 0; |
| 5132 | |
| 5133 | final_exit: |
| 5134 | if (rex->intflags & PREGf_VERBARG_SEEN) { |
| 5135 | SV *sv_err = get_sv("REGERROR", 1); |
| 5136 | SV *sv_mrk = get_sv("REGMARK", 1); |
| 5137 | if (result) { |
| 5138 | sv_commit = &PL_sv_no; |
| 5139 | if (!sv_yes_mark) |
| 5140 | sv_yes_mark = &PL_sv_yes; |
| 5141 | } else { |
| 5142 | if (!sv_commit) |
| 5143 | sv_commit = &PL_sv_yes; |
| 5144 | sv_yes_mark = &PL_sv_no; |
| 5145 | } |
| 5146 | sv_setsv(sv_err, sv_commit); |
| 5147 | sv_setsv(sv_mrk, sv_yes_mark); |
| 5148 | } |
| 5149 | /* restore original high-water mark */ |
| 5150 | PL_regmatch_slab = orig_slab; |
| 5151 | PL_regmatch_state = orig_state; |
| 5152 | |
| 5153 | /* free all slabs above current one */ |
| 5154 | if (orig_slab->next) { |
| 5155 | regmatch_slab *sl = orig_slab->next; |
| 5156 | orig_slab->next = NULL; |
| 5157 | while (sl) { |
| 5158 | regmatch_slab * const osl = sl; |
| 5159 | sl = sl->next; |
| 5160 | Safefree(osl); |
| 5161 | } |
| 5162 | } |
| 5163 | |
| 5164 | return result; |
| 5165 | } |
| 5166 | |
| 5167 | /* |
| 5168 | - regrepeat - repeatedly match something simple, report how many |
| 5169 | */ |
| 5170 | /* |
| 5171 | * [This routine now assumes that it will only match on things of length 1. |
| 5172 | * That was true before, but now we assume scan - reginput is the count, |
| 5173 | * rather than incrementing count on every character. [Er, except utf8.]] |
| 5174 | */ |
| 5175 | STATIC I32 |
| 5176 | S_regrepeat(pTHX_ const regexp *prog, const regnode *p, I32 max, int depth) |
| 5177 | { |
| 5178 | dVAR; |
| 5179 | register char *scan; |
| 5180 | register I32 c; |
| 5181 | register char *loceol = PL_regeol; |
| 5182 | register I32 hardcount = 0; |
| 5183 | register bool do_utf8 = PL_reg_match_utf8; |
| 5184 | #ifndef DEBUGGING |
| 5185 | PERL_UNUSED_ARG(depth); |
| 5186 | #endif |
| 5187 | |
| 5188 | scan = PL_reginput; |
| 5189 | if (max == REG_INFTY) |
| 5190 | max = I32_MAX; |
| 5191 | else if (max < loceol - scan) |
| 5192 | loceol = scan + max; |
| 5193 | switch (OP(p)) { |
| 5194 | case REG_ANY: |
| 5195 | if (do_utf8) { |
| 5196 | loceol = PL_regeol; |
| 5197 | while (scan < loceol && hardcount < max && *scan != '\n') { |
| 5198 | scan += UTF8SKIP(scan); |
| 5199 | hardcount++; |
| 5200 | } |
| 5201 | } else { |
| 5202 | while (scan < loceol && *scan != '\n') |
| 5203 | scan++; |
| 5204 | } |
| 5205 | break; |
| 5206 | case SANY: |
| 5207 | if (do_utf8) { |
| 5208 | loceol = PL_regeol; |
| 5209 | while (scan < loceol && hardcount < max) { |
| 5210 | scan += UTF8SKIP(scan); |
| 5211 | hardcount++; |
| 5212 | } |
| 5213 | } |
| 5214 | else |
| 5215 | scan = loceol; |
| 5216 | break; |
| 5217 | case CANY: |
| 5218 | scan = loceol; |
| 5219 | break; |
| 5220 | case EXACT: /* length of string is 1 */ |
| 5221 | c = (U8)*STRING(p); |
| 5222 | while (scan < loceol && UCHARAT(scan) == c) |
| 5223 | scan++; |
| 5224 | break; |
| 5225 | case EXACTF: /* length of string is 1 */ |
| 5226 | c = (U8)*STRING(p); |
| 5227 | while (scan < loceol && |
| 5228 | (UCHARAT(scan) == c || UCHARAT(scan) == PL_fold[c])) |
| 5229 | scan++; |
| 5230 | break; |
| 5231 | case EXACTFL: /* length of string is 1 */ |
| 5232 | PL_reg_flags |= RF_tainted; |
| 5233 | c = (U8)*STRING(p); |
| 5234 | while (scan < loceol && |
| 5235 | (UCHARAT(scan) == c || UCHARAT(scan) == PL_fold_locale[c])) |
| 5236 | scan++; |
| 5237 | break; |
| 5238 | case ANYOF: |
| 5239 | if (do_utf8) { |
| 5240 | loceol = PL_regeol; |
| 5241 | while (hardcount < max && scan < loceol && |
| 5242 | reginclass(prog, p, (U8*)scan, 0, do_utf8)) { |
| 5243 | scan += UTF8SKIP(scan); |
| 5244 | hardcount++; |
| 5245 | } |
| 5246 | } else { |
| 5247 | while (scan < loceol && REGINCLASS(prog, p, (U8*)scan)) |
| 5248 | scan++; |
| 5249 | } |
| 5250 | break; |
| 5251 | case ALNUM: |
| 5252 | if (do_utf8) { |
| 5253 | loceol = PL_regeol; |
| 5254 | LOAD_UTF8_CHARCLASS_ALNUM(); |
| 5255 | while (hardcount < max && scan < loceol && |
| 5256 | swash_fetch(PL_utf8_alnum, (U8*)scan, do_utf8)) { |
| 5257 | scan += UTF8SKIP(scan); |
| 5258 | hardcount++; |
| 5259 | } |
| 5260 | } else { |
| 5261 | while (scan < loceol && isALNUM(*scan)) |
| 5262 | scan++; |
| 5263 | } |
| 5264 | break; |
| 5265 | case ALNUML: |
| 5266 | PL_reg_flags |= RF_tainted; |
| 5267 | if (do_utf8) { |
| 5268 | loceol = PL_regeol; |
| 5269 | while (hardcount < max && scan < loceol && |
| 5270 | isALNUM_LC_utf8((U8*)scan)) { |
| 5271 | scan += UTF8SKIP(scan); |
| 5272 | hardcount++; |
| 5273 | } |
| 5274 | } else { |
| 5275 | while (scan < loceol && isALNUM_LC(*scan)) |
| 5276 | scan++; |
| 5277 | } |
| 5278 | break; |
| 5279 | case NALNUM: |
| 5280 | if (do_utf8) { |
| 5281 | loceol = PL_regeol; |
| 5282 | LOAD_UTF8_CHARCLASS_ALNUM(); |
| 5283 | while (hardcount < max && scan < loceol && |
| 5284 | !swash_fetch(PL_utf8_alnum, (U8*)scan, do_utf8)) { |
| 5285 | scan += UTF8SKIP(scan); |
| 5286 | hardcount++; |
| 5287 | } |
| 5288 | } else { |
| 5289 | while (scan < loceol && !isALNUM(*scan)) |
| 5290 | scan++; |
| 5291 | } |
| 5292 | break; |
| 5293 | case NALNUML: |
| 5294 | PL_reg_flags |= RF_tainted; |
| 5295 | if (do_utf8) { |
| 5296 | loceol = PL_regeol; |
| 5297 | while (hardcount < max && scan < loceol && |
| 5298 | !isALNUM_LC_utf8((U8*)scan)) { |
| 5299 | scan += UTF8SKIP(scan); |
| 5300 | hardcount++; |
| 5301 | } |
| 5302 | } else { |
| 5303 | while (scan < loceol && !isALNUM_LC(*scan)) |
| 5304 | scan++; |
| 5305 | } |
| 5306 | break; |
| 5307 | case SPACE: |
| 5308 | if (do_utf8) { |
| 5309 | loceol = PL_regeol; |
| 5310 | LOAD_UTF8_CHARCLASS_SPACE(); |
| 5311 | while (hardcount < max && scan < loceol && |
| 5312 | (*scan == ' ' || |
| 5313 | swash_fetch(PL_utf8_space,(U8*)scan, do_utf8))) { |
| 5314 | scan += UTF8SKIP(scan); |
| 5315 | hardcount++; |
| 5316 | } |
| 5317 | } else { |
| 5318 | while (scan < loceol && isSPACE(*scan)) |
| 5319 | scan++; |
| 5320 | } |
| 5321 | break; |
| 5322 | case SPACEL: |
| 5323 | PL_reg_flags |= RF_tainted; |
| 5324 | if (do_utf8) { |
| 5325 | loceol = PL_regeol; |
| 5326 | while (hardcount < max && scan < loceol && |
| 5327 | (*scan == ' ' || isSPACE_LC_utf8((U8*)scan))) { |
| 5328 | scan += UTF8SKIP(scan); |
| 5329 | hardcount++; |
| 5330 | } |
| 5331 | } else { |
| 5332 | while (scan < loceol && isSPACE_LC(*scan)) |
| 5333 | scan++; |
| 5334 | } |
| 5335 | break; |
| 5336 | case NSPACE: |
| 5337 | if (do_utf8) { |
| 5338 | loceol = PL_regeol; |
| 5339 | LOAD_UTF8_CHARCLASS_SPACE(); |
| 5340 | while (hardcount < max && scan < loceol && |
| 5341 | !(*scan == ' ' || |
| 5342 | swash_fetch(PL_utf8_space,(U8*)scan, do_utf8))) { |
| 5343 | scan += UTF8SKIP(scan); |
| 5344 | hardcount++; |
| 5345 | } |
| 5346 | } else { |
| 5347 | while (scan < loceol && !isSPACE(*scan)) |
| 5348 | scan++; |
| 5349 | break; |
| 5350 | } |
| 5351 | case NSPACEL: |
| 5352 | PL_reg_flags |= RF_tainted; |
| 5353 | if (do_utf8) { |
| 5354 | loceol = PL_regeol; |
| 5355 | while (hardcount < max && scan < loceol && |
| 5356 | !(*scan == ' ' || isSPACE_LC_utf8((U8*)scan))) { |
| 5357 | scan += UTF8SKIP(scan); |
| 5358 | hardcount++; |
| 5359 | } |
| 5360 | } else { |
| 5361 | while (scan < loceol && !isSPACE_LC(*scan)) |
| 5362 | scan++; |
| 5363 | } |
| 5364 | break; |
| 5365 | case DIGIT: |
| 5366 | if (do_utf8) { |
| 5367 | loceol = PL_regeol; |
| 5368 | LOAD_UTF8_CHARCLASS_DIGIT(); |
| 5369 | while (hardcount < max && scan < loceol && |
| 5370 | swash_fetch(PL_utf8_digit, (U8*)scan, do_utf8)) { |
| 5371 | scan += UTF8SKIP(scan); |
| 5372 | hardcount++; |
| 5373 | } |
| 5374 | } else { |
| 5375 | while (scan < loceol && isDIGIT(*scan)) |
| 5376 | scan++; |
| 5377 | } |
| 5378 | break; |
| 5379 | case NDIGIT: |
| 5380 | if (do_utf8) { |
| 5381 | loceol = PL_regeol; |
| 5382 | LOAD_UTF8_CHARCLASS_DIGIT(); |
| 5383 | while (hardcount < max && scan < loceol && |
| 5384 | !swash_fetch(PL_utf8_digit, (U8*)scan, do_utf8)) { |
| 5385 | scan += UTF8SKIP(scan); |
| 5386 | hardcount++; |
| 5387 | } |
| 5388 | } else { |
| 5389 | while (scan < loceol && !isDIGIT(*scan)) |
| 5390 | scan++; |
| 5391 | } |
| 5392 | break; |
| 5393 | default: /* Called on something of 0 width. */ |
| 5394 | break; /* So match right here or not at all. */ |
| 5395 | } |
| 5396 | |
| 5397 | if (hardcount) |
| 5398 | c = hardcount; |
| 5399 | else |
| 5400 | c = scan - PL_reginput; |
| 5401 | PL_reginput = scan; |
| 5402 | |
| 5403 | DEBUG_r({ |
| 5404 | GET_RE_DEBUG_FLAGS_DECL; |
| 5405 | DEBUG_EXECUTE_r({ |
| 5406 | SV * const prop = sv_newmortal(); |
| 5407 | regprop(prog, prop, p); |
| 5408 | PerlIO_printf(Perl_debug_log, |
| 5409 | "%*s %s can match %"IVdf" times out of %"IVdf"...\n", |
| 5410 | REPORT_CODE_OFF + depth*2, "", SvPVX_const(prop),(IV)c,(IV)max); |
| 5411 | }); |
| 5412 | }); |
| 5413 | |
| 5414 | return(c); |
| 5415 | } |
| 5416 | |
| 5417 | |
| 5418 | #if !defined(PERL_IN_XSUB_RE) || defined(PLUGGABLE_RE_EXTENSION) |
| 5419 | /* |
| 5420 | - regclass_swash - prepare the utf8 swash |
| 5421 | */ |
| 5422 | |
| 5423 | SV * |
| 5424 | Perl_regclass_swash(pTHX_ const regexp *prog, register const regnode* node, bool doinit, SV** listsvp, SV **altsvp) |
| 5425 | { |
| 5426 | dVAR; |
| 5427 | SV *sw = NULL; |
| 5428 | SV *si = NULL; |
| 5429 | SV *alt = NULL; |
| 5430 | RXi_GET_DECL(prog,progi); |
| 5431 | const struct reg_data * const data = prog ? progi->data : NULL; |
| 5432 | |
| 5433 | if (data && data->count) { |
| 5434 | const U32 n = ARG(node); |
| 5435 | |
| 5436 | if (data->what[n] == 's') { |
| 5437 | SV * const rv = (SV*)data->data[n]; |
| 5438 | AV * const av = (AV*)SvRV((SV*)rv); |
| 5439 | SV **const ary = AvARRAY(av); |
| 5440 | SV **a, **b; |
| 5441 | |
| 5442 | /* See the end of regcomp.c:S_regclass() for |
| 5443 | * documentation of these array elements. */ |
| 5444 | |
| 5445 | si = *ary; |
| 5446 | a = SvROK(ary[1]) ? &ary[1] : 0; |
| 5447 | b = SvTYPE(ary[2]) == SVt_PVAV ? &ary[2] : 0; |
| 5448 | |
| 5449 | if (a) |
| 5450 | sw = *a; |
| 5451 | else if (si && doinit) { |
| 5452 | sw = swash_init("utf8", "", si, 1, 0); |
| 5453 | (void)av_store(av, 1, sw); |
| 5454 | } |
| 5455 | if (b) |
| 5456 | alt = *b; |
| 5457 | } |
| 5458 | } |
| 5459 | |
| 5460 | if (listsvp) |
| 5461 | *listsvp = si; |
| 5462 | if (altsvp) |
| 5463 | *altsvp = alt; |
| 5464 | |
| 5465 | return sw; |
| 5466 | } |
| 5467 | #endif |
| 5468 | |
| 5469 | /* |
| 5470 | - reginclass - determine if a character falls into a character class |
| 5471 | |
| 5472 | The n is the ANYOF regnode, the p is the target string, lenp |
| 5473 | is pointer to the maximum length of how far to go in the p |
| 5474 | (if the lenp is zero, UTF8SKIP(p) is used), |
| 5475 | do_utf8 tells whether the target string is in UTF-8. |
| 5476 | |
| 5477 | */ |
| 5478 | |
| 5479 | STATIC bool |
| 5480 | S_reginclass(pTHX_ const regexp *prog, register const regnode *n, register const U8* p, STRLEN* lenp, register bool do_utf8) |
| 5481 | { |
| 5482 | dVAR; |
| 5483 | const char flags = ANYOF_FLAGS(n); |
| 5484 | bool match = FALSE; |
| 5485 | UV c = *p; |
| 5486 | STRLEN len = 0; |
| 5487 | STRLEN plen; |
| 5488 | |
| 5489 | if (do_utf8 && !UTF8_IS_INVARIANT(c)) { |
| 5490 | c = utf8n_to_uvchr(p, UTF8_MAXBYTES, &len, |
| 5491 | (UTF8_ALLOW_DEFAULT & UTF8_ALLOW_ANYUV) | UTF8_CHECK_ONLY); |
| 5492 | /* see [perl #37836] for UTF8_ALLOW_ANYUV */ |
| 5493 | if (len == (STRLEN)-1) |
| 5494 | Perl_croak(aTHX_ "Malformed UTF-8 character (fatal)"); |
| 5495 | } |
| 5496 | |
| 5497 | plen = lenp ? *lenp : UNISKIP(NATIVE_TO_UNI(c)); |
| 5498 | if (do_utf8 || (flags & ANYOF_UNICODE)) { |
| 5499 | if (lenp) |
| 5500 | *lenp = 0; |
| 5501 | if (do_utf8 && !ANYOF_RUNTIME(n)) { |
| 5502 | if (len != (STRLEN)-1 && c < 256 && ANYOF_BITMAP_TEST(n, c)) |
| 5503 | match = TRUE; |
| 5504 | } |
| 5505 | if (!match && do_utf8 && (flags & ANYOF_UNICODE_ALL) && c >= 256) |
| 5506 | match = TRUE; |
| 5507 | if (!match) { |
| 5508 | AV *av; |
| 5509 | SV * const sw = regclass_swash(prog, n, TRUE, 0, (SV**)&av); |
| 5510 | |
| 5511 | if (sw) { |
| 5512 | if (swash_fetch(sw, p, do_utf8)) |
| 5513 | match = TRUE; |
| 5514 | else if (flags & ANYOF_FOLD) { |
| 5515 | if (!match && lenp && av) { |
| 5516 | I32 i; |
| 5517 | for (i = 0; i <= av_len(av); i++) { |
| 5518 | SV* const sv = *av_fetch(av, i, FALSE); |
| 5519 | STRLEN len; |
| 5520 | const char * const s = SvPV_const(sv, len); |
| 5521 | |
| 5522 | if (len <= plen && memEQ(s, (char*)p, len)) { |
| 5523 | *lenp = len; |
| 5524 | match = TRUE; |
| 5525 | break; |
| 5526 | } |
| 5527 | } |
| 5528 | } |
| 5529 | if (!match) { |
| 5530 | U8 tmpbuf[UTF8_MAXBYTES_CASE+1]; |
| 5531 | STRLEN tmplen; |
| 5532 | |
| 5533 | to_utf8_fold(p, tmpbuf, &tmplen); |
| 5534 | if (swash_fetch(sw, tmpbuf, do_utf8)) |
| 5535 | match = TRUE; |
| 5536 | } |
| 5537 | } |
| 5538 | } |
| 5539 | } |
| 5540 | if (match && lenp && *lenp == 0) |
| 5541 | *lenp = UNISKIP(NATIVE_TO_UNI(c)); |
| 5542 | } |
| 5543 | if (!match && c < 256) { |
| 5544 | if (ANYOF_BITMAP_TEST(n, c)) |
| 5545 | match = TRUE; |
| 5546 | else if (flags & ANYOF_FOLD) { |
| 5547 | U8 f; |
| 5548 | |
| 5549 | if (flags & ANYOF_LOCALE) { |
| 5550 | PL_reg_flags |= RF_tainted; |
| 5551 | f = PL_fold_locale[c]; |
| 5552 | } |
| 5553 | else |
| 5554 | f = PL_fold[c]; |
| 5555 | if (f != c && ANYOF_BITMAP_TEST(n, f)) |
| 5556 | match = TRUE; |
| 5557 | } |
| 5558 | |
| 5559 | if (!match && (flags & ANYOF_CLASS)) { |
| 5560 | PL_reg_flags |= RF_tainted; |
| 5561 | if ( |
| 5562 | (ANYOF_CLASS_TEST(n, ANYOF_ALNUM) && isALNUM_LC(c)) || |
| 5563 | (ANYOF_CLASS_TEST(n, ANYOF_NALNUM) && !isALNUM_LC(c)) || |
| 5564 | (ANYOF_CLASS_TEST(n, ANYOF_SPACE) && isSPACE_LC(c)) || |
| 5565 | (ANYOF_CLASS_TEST(n, ANYOF_NSPACE) && !isSPACE_LC(c)) || |
| 5566 | (ANYOF_CLASS_TEST(n, ANYOF_DIGIT) && isDIGIT_LC(c)) || |
| 5567 | (ANYOF_CLASS_TEST(n, ANYOF_NDIGIT) && !isDIGIT_LC(c)) || |
| 5568 | (ANYOF_CLASS_TEST(n, ANYOF_ALNUMC) && isALNUMC_LC(c)) || |
| 5569 | (ANYOF_CLASS_TEST(n, ANYOF_NALNUMC) && !isALNUMC_LC(c)) || |
| 5570 | (ANYOF_CLASS_TEST(n, ANYOF_ALPHA) && isALPHA_LC(c)) || |
| 5571 | (ANYOF_CLASS_TEST(n, ANYOF_NALPHA) && !isALPHA_LC(c)) || |
| 5572 | (ANYOF_CLASS_TEST(n, ANYOF_ASCII) && isASCII(c)) || |
| 5573 | (ANYOF_CLASS_TEST(n, ANYOF_NASCII) && !isASCII(c)) || |
| 5574 | (ANYOF_CLASS_TEST(n, ANYOF_CNTRL) && isCNTRL_LC(c)) || |
| 5575 | (ANYOF_CLASS_TEST(n, ANYOF_NCNTRL) && !isCNTRL_LC(c)) || |
| 5576 | (ANYOF_CLASS_TEST(n, ANYOF_GRAPH) && isGRAPH_LC(c)) || |
| 5577 | (ANYOF_CLASS_TEST(n, ANYOF_NGRAPH) && !isGRAPH_LC(c)) || |
| 5578 | (ANYOF_CLASS_TEST(n, ANYOF_LOWER) && isLOWER_LC(c)) || |
| 5579 | (ANYOF_CLASS_TEST(n, ANYOF_NLOWER) && !isLOWER_LC(c)) || |
| 5580 | (ANYOF_CLASS_TEST(n, ANYOF_PRINT) && isPRINT_LC(c)) || |
| 5581 | (ANYOF_CLASS_TEST(n, ANYOF_NPRINT) && !isPRINT_LC(c)) || |
| 5582 | (ANYOF_CLASS_TEST(n, ANYOF_PUNCT) && isPUNCT_LC(c)) || |
| 5583 | (ANYOF_CLASS_TEST(n, ANYOF_NPUNCT) && !isPUNCT_LC(c)) || |
| 5584 | (ANYOF_CLASS_TEST(n, ANYOF_UPPER) && isUPPER_LC(c)) || |
| 5585 | (ANYOF_CLASS_TEST(n, ANYOF_NUPPER) && !isUPPER_LC(c)) || |
| 5586 | (ANYOF_CLASS_TEST(n, ANYOF_XDIGIT) && isXDIGIT(c)) || |
| 5587 | (ANYOF_CLASS_TEST(n, ANYOF_NXDIGIT) && !isXDIGIT(c)) || |
| 5588 | (ANYOF_CLASS_TEST(n, ANYOF_PSXSPC) && isPSXSPC(c)) || |
| 5589 | (ANYOF_CLASS_TEST(n, ANYOF_NPSXSPC) && !isPSXSPC(c)) || |
| 5590 | (ANYOF_CLASS_TEST(n, ANYOF_BLANK) && isBLANK(c)) || |
| 5591 | (ANYOF_CLASS_TEST(n, ANYOF_NBLANK) && !isBLANK(c)) |
| 5592 | ) /* How's that for a conditional? */ |
| 5593 | { |
| 5594 | match = TRUE; |
| 5595 | } |
| 5596 | } |
| 5597 | } |
| 5598 | |
| 5599 | return (flags & ANYOF_INVERT) ? !match : match; |
| 5600 | } |
| 5601 | |
| 5602 | STATIC U8 * |
| 5603 | S_reghop3(U8 *s, I32 off, const U8* lim) |
| 5604 | { |
| 5605 | dVAR; |
| 5606 | if (off >= 0) { |
| 5607 | while (off-- && s < lim) { |
| 5608 | /* XXX could check well-formedness here */ |
| 5609 | s += UTF8SKIP(s); |
| 5610 | } |
| 5611 | } |
| 5612 | else { |
| 5613 | while (off++ && s > lim) { |
| 5614 | s--; |
| 5615 | if (UTF8_IS_CONTINUED(*s)) { |
| 5616 | while (s > lim && UTF8_IS_CONTINUATION(*s)) |
| 5617 | s--; |
| 5618 | } |
| 5619 | /* XXX could check well-formedness here */ |
| 5620 | } |
| 5621 | } |
| 5622 | return s; |
| 5623 | } |
| 5624 | |
| 5625 | #ifdef XXX_dmq |
| 5626 | /* there are a bunch of places where we use two reghop3's that should |
| 5627 | be replaced with this routine. but since thats not done yet |
| 5628 | we ifdef it out - dmq |
| 5629 | */ |
| 5630 | STATIC U8 * |
| 5631 | S_reghop4(U8 *s, I32 off, const U8* llim, const U8* rlim) |
| 5632 | { |
| 5633 | dVAR; |
| 5634 | if (off >= 0) { |
| 5635 | while (off-- && s < rlim) { |
| 5636 | /* XXX could check well-formedness here */ |
| 5637 | s += UTF8SKIP(s); |
| 5638 | } |
| 5639 | } |
| 5640 | else { |
| 5641 | while (off++ && s > llim) { |
| 5642 | s--; |
| 5643 | if (UTF8_IS_CONTINUED(*s)) { |
| 5644 | while (s > llim && UTF8_IS_CONTINUATION(*s)) |
| 5645 | s--; |
| 5646 | } |
| 5647 | /* XXX could check well-formedness here */ |
| 5648 | } |
| 5649 | } |
| 5650 | return s; |
| 5651 | } |
| 5652 | #endif |
| 5653 | |
| 5654 | STATIC U8 * |
| 5655 | S_reghopmaybe3(U8* s, I32 off, const U8* lim) |
| 5656 | { |
| 5657 | dVAR; |
| 5658 | if (off >= 0) { |
| 5659 | while (off-- && s < lim) { |
| 5660 | /* XXX could check well-formedness here */ |
| 5661 | s += UTF8SKIP(s); |
| 5662 | } |
| 5663 | if (off >= 0) |
| 5664 | return NULL; |
| 5665 | } |
| 5666 | else { |
| 5667 | while (off++ && s > lim) { |
| 5668 | s--; |
| 5669 | if (UTF8_IS_CONTINUED(*s)) { |
| 5670 | while (s > lim && UTF8_IS_CONTINUATION(*s)) |
| 5671 | s--; |
| 5672 | } |
| 5673 | /* XXX could check well-formedness here */ |
| 5674 | } |
| 5675 | if (off <= 0) |
| 5676 | return NULL; |
| 5677 | } |
| 5678 | return s; |
| 5679 | } |
| 5680 | |
| 5681 | static void |
| 5682 | restore_pos(pTHX_ void *arg) |
| 5683 | { |
| 5684 | dVAR; |
| 5685 | regexp * const rex = (regexp *)arg; |
| 5686 | if (PL_reg_eval_set) { |
| 5687 | if (PL_reg_oldsaved) { |
| 5688 | rex->subbeg = PL_reg_oldsaved; |
| 5689 | rex->sublen = PL_reg_oldsavedlen; |
| 5690 | #ifdef PERL_OLD_COPY_ON_WRITE |
| 5691 | rex->saved_copy = PL_nrs; |
| 5692 | #endif |
| 5693 | RX_MATCH_COPIED_on(rex); |
| 5694 | } |
| 5695 | PL_reg_magic->mg_len = PL_reg_oldpos; |
| 5696 | PL_reg_eval_set = 0; |
| 5697 | PL_curpm = PL_reg_oldcurpm; |
| 5698 | } |
| 5699 | } |
| 5700 | |
| 5701 | STATIC void |
| 5702 | S_to_utf8_substr(pTHX_ register regexp *prog) |
| 5703 | { |
| 5704 | int i = 1; |
| 5705 | do { |
| 5706 | if (prog->substrs->data[i].substr |
| 5707 | && !prog->substrs->data[i].utf8_substr) { |
| 5708 | SV* const sv = newSVsv(prog->substrs->data[i].substr); |
| 5709 | prog->substrs->data[i].utf8_substr = sv; |
| 5710 | sv_utf8_upgrade(sv); |
| 5711 | if (SvVALID(prog->substrs->data[i].substr)) { |
| 5712 | const U8 flags = BmFLAGS(prog->substrs->data[i].substr); |
| 5713 | if (flags & FBMcf_TAIL) { |
| 5714 | /* Trim the trailing \n that fbm_compile added last |
| 5715 | time. */ |
| 5716 | SvCUR_set(sv, SvCUR(sv) - 1); |
| 5717 | /* Whilst this makes the SV technically "invalid" (as its |
| 5718 | buffer is no longer followed by "\0") when fbm_compile() |
| 5719 | adds the "\n" back, a "\0" is restored. */ |
| 5720 | } |
| 5721 | fbm_compile(sv, flags); |
| 5722 | } |
| 5723 | if (prog->substrs->data[i].substr == prog->check_substr) |
| 5724 | prog->check_utf8 = sv; |
| 5725 | } |
| 5726 | } while (i--); |
| 5727 | } |
| 5728 | |
| 5729 | STATIC void |
| 5730 | S_to_byte_substr(pTHX_ register regexp *prog) |
| 5731 | { |
| 5732 | dVAR; |
| 5733 | int i = 1; |
| 5734 | do { |
| 5735 | if (prog->substrs->data[i].utf8_substr |
| 5736 | && !prog->substrs->data[i].substr) { |
| 5737 | SV* sv = newSVsv(prog->substrs->data[i].utf8_substr); |
| 5738 | if (sv_utf8_downgrade(sv, TRUE)) { |
| 5739 | if (SvVALID(prog->substrs->data[i].utf8_substr)) { |
| 5740 | const U8 flags |
| 5741 | = BmFLAGS(prog->substrs->data[i].utf8_substr); |
| 5742 | if (flags & FBMcf_TAIL) { |
| 5743 | /* Trim the trailing \n that fbm_compile added last |
| 5744 | time. */ |
| 5745 | SvCUR_set(sv, SvCUR(sv) - 1); |
| 5746 | } |
| 5747 | fbm_compile(sv, flags); |
| 5748 | } |
| 5749 | } else { |
| 5750 | SvREFCNT_dec(sv); |
| 5751 | sv = &PL_sv_undef; |
| 5752 | } |
| 5753 | prog->substrs->data[i].substr = sv; |
| 5754 | if (prog->substrs->data[i].utf8_substr == prog->check_utf8) |
| 5755 | prog->check_substr = sv; |
| 5756 | } |
| 5757 | } while (i--); |
| 5758 | } |
| 5759 | |
| 5760 | /* |
| 5761 | * Local variables: |
| 5762 | * c-indentation-style: bsd |
| 5763 | * c-basic-offset: 4 |
| 5764 | * indent-tabs-mode: t |
| 5765 | * End: |
| 5766 | * |
| 5767 | * ex: set ts=8 sts=4 sw=4 noet: |
| 5768 | */ |