X-Git-Url: http://git.vpit.fr/?p=perl%2Fmodules%2Fre-engine-Hooks.git;a=blobdiff_plain;f=src%2F5011005%2Fregexec.c;fp=src%2F5011005%2Fregexec.c;h=0000000000000000000000000000000000000000;hp=1c8825192b8d7b288ccf8ea8c296f9363145aa4b;hb=3f6667898e8cbd21ca5c75f79f3fd1d27c44a96a;hpb=41b56a84dc14873e4c9638d315b3fc525324c288 diff --git a/src/5011005/regexec.c b/src/5011005/regexec.c deleted file mode 100644 index 1c88251..0000000 --- a/src/5011005/regexec.c +++ /dev/null @@ -1,6256 +0,0 @@ -/* regexec.c - */ - -/* - * One Ring to rule them all, One Ring to find them - & - * [p.v of _The Lord of the Rings_, opening poem] - * [p.50 of _The Lord of the Rings_, I/iii: "The Shadow of the Past"] - * [p.254 of _The Lord of the Rings_, II/ii: "The Council of Elrond"] - */ - -/* This file contains functions for executing a regular expression. See - * also regcomp.c which funnily enough, contains functions for compiling - * a regular expression. - * - * This file is also copied at build time to ext/re/re_exec.c, where - * it's built with -DPERL_EXT_RE_BUILD -DPERL_EXT_RE_DEBUG -DPERL_EXT. - * This causes the main functions to be compiled under new names and with - * debugging support added, which makes "use re 'debug'" work. - */ - -/* NOTE: this is derived from Henry Spencer's regexp code, and should not - * confused with the original package (see point 3 below). Thanks, Henry! - */ - -/* Additional note: this code is very heavily munged from Henry's version - * in places. In some spots I've traded clarity for efficiency, so don't - * blame Henry for some of the lack of readability. - */ - -/* The names of the functions have been changed from regcomp and - * regexec to pregcomp and pregexec in order to avoid conflicts - * with the POSIX routines of the same names. -*/ - -#ifdef PERL_EXT_RE_BUILD -#include "re_top.h" -#endif - -/* - * pregcomp and pregexec -- regsub and regerror are not used in perl - * - * Copyright (c) 1986 by University of Toronto. - * Written by Henry Spencer. Not derived from licensed software. - * - * Permission is granted to anyone to use this software for any - * purpose on any computer system, and to redistribute it freely, - * subject to the following restrictions: - * - * 1. The author is not responsible for the consequences of use of - * this software, no matter how awful, even if they arise - * from defects in it. - * - * 2. The origin of this software must not be misrepresented, either - * by explicit claim or by omission. - * - * 3. Altered versions must be plainly marked as such, and must not - * be misrepresented as being the original software. - * - **** Alterations to Henry's code are... - **** - **** Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, - **** 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 - **** by Larry Wall and others - **** - **** You may distribute under the terms of either the GNU General Public - **** License or the Artistic License, as specified in the README file. - * - * Beware that some of this code is subtly aware of the way operator - * precedence is structured in regular expressions. Serious changes in - * regular-expression syntax might require a total rethink. - */ -#include "EXTERN.h" -#define PERL_IN_REGEXEC_C -#include "perl.h" -#include "re_defs.h" - -#ifdef PERL_IN_XSUB_RE -# include "re_comp.h" -#else -# include "regcomp.h" -#endif - -#define RF_tainted 1 /* tainted information used? */ -#define RF_warned 2 /* warned about big count? */ - -#define RF_utf8 8 /* Pattern contains multibyte chars? */ - -#define UTF ((PL_reg_flags & RF_utf8) != 0) - -#define RS_init 1 /* eval environment created */ -#define RS_set 2 /* replsv value is set */ - -#ifndef STATIC -#define STATIC static -#endif - -#define REGINCLASS(prog,p,c) (ANYOF_FLAGS(p) ? reginclass(prog,p,c,0,0) : ANYOF_BITMAP_TEST(p,*(c))) - -/* - * Forwards. - */ - -#define CHR_SVLEN(sv) (do_utf8 ? sv_len_utf8(sv) : SvCUR(sv)) -#define CHR_DIST(a,b) (PL_reg_match_utf8 ? utf8_distance(a,b) : a - b) - -#define HOPc(pos,off) \ - (char *)(PL_reg_match_utf8 \ - ? reghop3((U8*)pos, off, (U8*)(off >= 0 ? PL_regeol : PL_bostr)) \ - : (U8*)(pos + off)) -#define HOPBACKc(pos, off) \ - (char*)(PL_reg_match_utf8\ - ? reghopmaybe3((U8*)pos, -off, (U8*)PL_bostr) \ - : (pos - off >= PL_bostr) \ - ? (U8*)pos - off \ - : NULL) - -#define HOP3(pos,off,lim) (PL_reg_match_utf8 ? reghop3((U8*)(pos), off, (U8*)(lim)) : (U8*)(pos + off)) -#define HOP3c(pos,off,lim) ((char*)HOP3(pos,off,lim)) - -/* these are unrolled below in the CCC_TRY_XXX defined */ -#define LOAD_UTF8_CHARCLASS(class,str) STMT_START { \ - if (!CAT2(PL_utf8_,class)) { bool ok; ENTER; save_re_context(); ok=CAT2(is_utf8_,class)((const U8*)str); assert(ok); LEAVE; } } STMT_END - -/* Doesn't do an assert to verify that is correct */ -#define LOAD_UTF8_CHARCLASS_NO_CHECK(class) STMT_START { \ - if (!CAT2(PL_utf8_,class)) { bool ok; ENTER; save_re_context(); ok=CAT2(is_utf8_,class)((const U8*)" "); LEAVE; } } STMT_END - -#define LOAD_UTF8_CHARCLASS_ALNUM() LOAD_UTF8_CHARCLASS(alnum,"a") -#define LOAD_UTF8_CHARCLASS_DIGIT() LOAD_UTF8_CHARCLASS(digit,"0") -#define LOAD_UTF8_CHARCLASS_SPACE() LOAD_UTF8_CHARCLASS(space," ") - -#define LOAD_UTF8_CHARCLASS_GCB() /* Grapheme cluster boundaries */ \ - LOAD_UTF8_CHARCLASS(X_begin, " "); \ - LOAD_UTF8_CHARCLASS(X_non_hangul, "A"); \ - /* These are utf8 constants, and not utf-ebcdic constants, so the \ - * assert should likely and hopefully fail on an EBCDIC machine */ \ - LOAD_UTF8_CHARCLASS(X_extend, "\xcc\x80"); /* U+0300 */ \ - \ - /* No asserts are done for these, in case called on an early \ - * Unicode version in which they map to nothing */ \ - LOAD_UTF8_CHARCLASS_NO_CHECK(X_prepend);/* U+0E40 "\xe0\xb9\x80" */ \ - LOAD_UTF8_CHARCLASS_NO_CHECK(X_L); /* U+1100 "\xe1\x84\x80" */ \ - LOAD_UTF8_CHARCLASS_NO_CHECK(X_LV); /* U+AC00 "\xea\xb0\x80" */ \ - LOAD_UTF8_CHARCLASS_NO_CHECK(X_LVT); /* U+AC01 "\xea\xb0\x81" */ \ - LOAD_UTF8_CHARCLASS_NO_CHECK(X_LV_LVT_V);/* U+AC01 "\xea\xb0\x81" */\ - LOAD_UTF8_CHARCLASS_NO_CHECK(X_T); /* U+11A8 "\xe1\x86\xa8" */ \ - LOAD_UTF8_CHARCLASS_NO_CHECK(X_V) /* U+1160 "\xe1\x85\xa0" */ - -/* - We dont use PERL_LEGACY_UNICODE_CHARCLASS_MAPPINGS as the direct test - so that it is possible to override the option here without having to - rebuild the entire core. as we are required to do if we change regcomp.h - which is where PERL_LEGACY_UNICODE_CHARCLASS_MAPPINGS is defined. -*/ -#if PERL_LEGACY_UNICODE_CHARCLASS_MAPPINGS -#define BROKEN_UNICODE_CHARCLASS_MAPPINGS -#endif - -#ifdef BROKEN_UNICODE_CHARCLASS_MAPPINGS -#define LOAD_UTF8_CHARCLASS_PERL_WORD() LOAD_UTF8_CHARCLASS_ALNUM() -#define LOAD_UTF8_CHARCLASS_PERL_SPACE() LOAD_UTF8_CHARCLASS_SPACE() -#define LOAD_UTF8_CHARCLASS_POSIX_DIGIT() LOAD_UTF8_CHARCLASS_DIGIT() -#define RE_utf8_perl_word PL_utf8_alnum -#define RE_utf8_perl_space PL_utf8_space -#define RE_utf8_posix_digit PL_utf8_digit -#define perl_word alnum -#define perl_space space -#define posix_digit digit -#else -#define LOAD_UTF8_CHARCLASS_PERL_WORD() LOAD_UTF8_CHARCLASS(perl_word,"a") -#define LOAD_UTF8_CHARCLASS_PERL_SPACE() LOAD_UTF8_CHARCLASS(perl_space," ") -#define LOAD_UTF8_CHARCLASS_POSIX_DIGIT() LOAD_UTF8_CHARCLASS(posix_digit,"0") -#define RE_utf8_perl_word PL_utf8_perl_word -#define RE_utf8_perl_space PL_utf8_perl_space -#define RE_utf8_posix_digit PL_utf8_posix_digit -#endif - - -#define CCC_TRY_AFF(NAME,NAMEL,CLASS,STR,LCFUNC_utf8,FUNC,LCFUNC) \ - case NAMEL: \ - PL_reg_flags |= RF_tainted; \ - /* FALL THROUGH */ \ - case NAME: \ - if (!nextchr) \ - sayNO; \ - if (do_utf8 && UTF8_IS_CONTINUED(nextchr)) { \ - if (!CAT2(PL_utf8_,CLASS)) { \ - bool ok; \ - ENTER; \ - save_re_context(); \ - ok=CAT2(is_utf8_,CLASS)((const U8*)STR); \ - assert(ok); \ - LEAVE; \ - } \ - if (!(OP(scan) == NAME \ - ? (bool)swash_fetch(CAT2(PL_utf8_,CLASS), (U8*)locinput, do_utf8) \ - : LCFUNC_utf8((U8*)locinput))) \ - { \ - sayNO; \ - } \ - locinput += PL_utf8skip[nextchr]; \ - nextchr = UCHARAT(locinput); \ - break; \ - } \ - if (!(OP(scan) == NAME ? FUNC(nextchr) : LCFUNC(nextchr))) \ - sayNO; \ - nextchr = UCHARAT(++locinput); \ - break - -#define CCC_TRY_NEG(NAME,NAMEL,CLASS,STR,LCFUNC_utf8,FUNC,LCFUNC) \ - case NAMEL: \ - PL_reg_flags |= RF_tainted; \ - /* FALL THROUGH */ \ - case NAME : \ - if (!nextchr && locinput >= PL_regeol) \ - sayNO; \ - if (do_utf8 && UTF8_IS_CONTINUED(nextchr)) { \ - if (!CAT2(PL_utf8_,CLASS)) { \ - bool ok; \ - ENTER; \ - save_re_context(); \ - ok=CAT2(is_utf8_,CLASS)((const U8*)STR); \ - assert(ok); \ - LEAVE; \ - } \ - if ((OP(scan) == NAME \ - ? (bool)swash_fetch(CAT2(PL_utf8_,CLASS), (U8*)locinput, do_utf8) \ - : LCFUNC_utf8((U8*)locinput))) \ - { \ - sayNO; \ - } \ - locinput += PL_utf8skip[nextchr]; \ - nextchr = UCHARAT(locinput); \ - break; \ - } \ - if ((OP(scan) == NAME ? FUNC(nextchr) : LCFUNC(nextchr))) \ - sayNO; \ - nextchr = UCHARAT(++locinput); \ - break - - - - - -/* TODO: Combine JUMPABLE and HAS_TEXT to cache OP(rn) */ - -/* for use after a quantifier and before an EXACT-like node -- japhy */ -/* it would be nice to rework regcomp.sym to generate this stuff. sigh */ -#define JUMPABLE(rn) ( \ - OP(rn) == OPEN || \ - (OP(rn) == CLOSE && (!cur_eval || cur_eval->u.eval.close_paren != ARG(rn))) || \ - OP(rn) == EVAL || \ - OP(rn) == SUSPEND || OP(rn) == IFMATCH || \ - OP(rn) == PLUS || OP(rn) == MINMOD || \ - OP(rn) == KEEPS || (PL_regkind[OP(rn)] == VERB) || \ - (PL_regkind[OP(rn)] == CURLY && ARG1(rn) > 0) \ -) -#define IS_EXACT(rn) (PL_regkind[OP(rn)] == EXACT) - -#define HAS_TEXT(rn) ( IS_EXACT(rn) || PL_regkind[OP(rn)] == REF ) - -#if 0 -/* Currently these are only used when PL_regkind[OP(rn)] == EXACT so - we don't need this definition. */ -#define IS_TEXT(rn) ( OP(rn)==EXACT || OP(rn)==REF || OP(rn)==NREF ) -#define IS_TEXTF(rn) ( OP(rn)==EXACTF || OP(rn)==REFF || OP(rn)==NREFF ) -#define IS_TEXTFL(rn) ( OP(rn)==EXACTFL || OP(rn)==REFFL || OP(rn)==NREFFL ) - -#else -/* ... so we use this as its faster. */ -#define IS_TEXT(rn) ( OP(rn)==EXACT ) -#define IS_TEXTF(rn) ( OP(rn)==EXACTF ) -#define IS_TEXTFL(rn) ( OP(rn)==EXACTFL ) - -#endif - -/* - Search for mandatory following text node; for lookahead, the text must - follow but for lookbehind (rn->flags != 0) we skip to the next step. -*/ -#define FIND_NEXT_IMPT(rn) STMT_START { \ - while (JUMPABLE(rn)) { \ - const OPCODE type = OP(rn); \ - if (type == SUSPEND || PL_regkind[type] == CURLY) \ - rn = NEXTOPER(NEXTOPER(rn)); \ - else if (type == PLUS) \ - rn = NEXTOPER(rn); \ - else if (type == IFMATCH) \ - rn = (rn->flags == 0) ? NEXTOPER(NEXTOPER(rn)) : rn + ARG(rn); \ - else rn += NEXT_OFF(rn); \ - } \ -} STMT_END - - -static void restore_pos(pTHX_ void *arg); - -STATIC CHECKPOINT -S_regcppush(pTHX_ I32 parenfloor) -{ - dVAR; - const int retval = PL_savestack_ix; -#define REGCP_PAREN_ELEMS 4 - const int paren_elems_to_push = (PL_regsize - parenfloor) * REGCP_PAREN_ELEMS; - int p; - GET_RE_DEBUG_FLAGS_DECL; - - if (paren_elems_to_push < 0) - Perl_croak(aTHX_ "panic: paren_elems_to_push < 0"); - -#define REGCP_OTHER_ELEMS 7 - SSGROW(paren_elems_to_push + REGCP_OTHER_ELEMS); - - for (p = PL_regsize; p > parenfloor; p--) { -/* REGCP_PARENS_ELEMS are pushed per pairs of parentheses. */ - SSPUSHINT(PL_regoffs[p].end); - SSPUSHINT(PL_regoffs[p].start); - SSPUSHPTR(PL_reg_start_tmp[p]); - SSPUSHINT(p); - DEBUG_BUFFERS_r(PerlIO_printf(Perl_debug_log, - " saving \\%"UVuf" %"IVdf"(%"IVdf")..%"IVdf"\n", - (UV)p, (IV)PL_regoffs[p].start, - (IV)(PL_reg_start_tmp[p] - PL_bostr), - (IV)PL_regoffs[p].end - )); - } -/* REGCP_OTHER_ELEMS are pushed in any case, parentheses or no. */ - SSPUSHPTR(PL_regoffs); - SSPUSHINT(PL_regsize); - SSPUSHINT(*PL_reglastparen); - SSPUSHINT(*PL_reglastcloseparen); - SSPUSHPTR(PL_reginput); -#define REGCP_FRAME_ELEMS 2 -/* REGCP_FRAME_ELEMS are part of the REGCP_OTHER_ELEMS and - * are needed for the regexp context stack bookkeeping. */ - SSPUSHINT(paren_elems_to_push + REGCP_OTHER_ELEMS - REGCP_FRAME_ELEMS); - SSPUSHINT(SAVEt_REGCONTEXT); /* Magic cookie. */ - - return retval; -} - -/* These are needed since we do not localize EVAL nodes: */ -#define REGCP_SET(cp) \ - DEBUG_STATE_r( \ - PerlIO_printf(Perl_debug_log, \ - " Setting an EVAL scope, savestack=%"IVdf"\n", \ - (IV)PL_savestack_ix)); \ - cp = PL_savestack_ix - -#define REGCP_UNWIND(cp) \ - DEBUG_STATE_r( \ - if (cp != PL_savestack_ix) \ - PerlIO_printf(Perl_debug_log, \ - " Clearing an EVAL scope, savestack=%"IVdf"..%"IVdf"\n", \ - (IV)(cp), (IV)PL_savestack_ix)); \ - regcpblow(cp) - -STATIC char * -S_regcppop(pTHX_ const regexp *rex) -{ - dVAR; - U32 i; - char *input; - GET_RE_DEBUG_FLAGS_DECL; - - PERL_ARGS_ASSERT_REGCPPOP; - - /* Pop REGCP_OTHER_ELEMS before the parentheses loop starts. */ - i = SSPOPINT; - assert(i == SAVEt_REGCONTEXT); /* Check that the magic cookie is there. */ - i = SSPOPINT; /* Parentheses elements to pop. */ - input = (char *) SSPOPPTR; - *PL_reglastcloseparen = SSPOPINT; - *PL_reglastparen = SSPOPINT; - PL_regsize = SSPOPINT; - PL_regoffs=(regexp_paren_pair *) SSPOPPTR; - - - /* Now restore the parentheses context. */ - for (i -= (REGCP_OTHER_ELEMS - REGCP_FRAME_ELEMS); - i > 0; i -= REGCP_PAREN_ELEMS) { - I32 tmps; - U32 paren = (U32)SSPOPINT; - PL_reg_start_tmp[paren] = (char *) SSPOPPTR; - PL_regoffs[paren].start = SSPOPINT; - tmps = SSPOPINT; - if (paren <= *PL_reglastparen) - PL_regoffs[paren].end = tmps; - DEBUG_BUFFERS_r( - PerlIO_printf(Perl_debug_log, - " restoring \\%"UVuf" to %"IVdf"(%"IVdf")..%"IVdf"%s\n", - (UV)paren, (IV)PL_regoffs[paren].start, - (IV)(PL_reg_start_tmp[paren] - PL_bostr), - (IV)PL_regoffs[paren].end, - (paren > *PL_reglastparen ? "(no)" : "")); - ); - } - DEBUG_BUFFERS_r( - if (*PL_reglastparen + 1 <= rex->nparens) { - PerlIO_printf(Perl_debug_log, - " restoring \\%"IVdf"..\\%"IVdf" to undef\n", - (IV)(*PL_reglastparen + 1), (IV)rex->nparens); - } - ); -#if 1 - /* It would seem that the similar code in regtry() - * already takes care of this, and in fact it is in - * a better location to since this code can #if 0-ed out - * but the code in regtry() is needed or otherwise tests - * requiring null fields (pat.t#187 and split.t#{13,14} - * (as of patchlevel 7877) will fail. Then again, - * this code seems to be necessary or otherwise - * this erroneously leaves $1 defined: "1" =~ /^(?:(\d)x)?\d$/ - * --jhi updated by dapm */ - for (i = *PL_reglastparen + 1; i <= rex->nparens; i++) { - if (i > PL_regsize) - PL_regoffs[i].start = -1; - PL_regoffs[i].end = -1; - } -#endif - return input; -} - -#define regcpblow(cp) LEAVE_SCOPE(cp) /* Ignores regcppush()ed data. */ - -/* - * pregexec and friends - */ - -#ifndef PERL_IN_XSUB_RE -/* - - pregexec - match a regexp against a string - */ -I32 -Perl_pregexec(pTHX_ REGEXP * const prog, char* stringarg, register char *strend, - char *strbeg, I32 minend, SV *screamer, U32 nosave) -/* strend: pointer to null at end of string */ -/* strbeg: real beginning of string */ -/* minend: end of match must be >=minend after stringarg. */ -/* nosave: For optimizations. */ -{ - PERL_ARGS_ASSERT_PREGEXEC; - - return - regexec_flags(prog, stringarg, strend, strbeg, minend, screamer, NULL, - nosave ? 0 : REXEC_COPY_STR); -} -#endif - -/* - * Need to implement the following flags for reg_anch: - * - * USE_INTUIT_NOML - Useful to call re_intuit_start() first - * USE_INTUIT_ML - * INTUIT_AUTORITATIVE_NOML - Can trust a positive answer - * INTUIT_AUTORITATIVE_ML - * INTUIT_ONCE_NOML - Intuit can match in one location only. - * INTUIT_ONCE_ML - * - * Another flag for this function: SECOND_TIME (so that float substrs - * with giant delta may be not rechecked). - */ - -/* Assumptions: if ANCH_GPOS, then strpos is anchored. XXXX Check GPOS logic */ - -/* If SCREAM, then SvPVX_const(sv) should be compatible with strpos and strend. - Otherwise, only SvCUR(sv) is used to get strbeg. */ - -/* XXXX We assume that strpos is strbeg unless sv. */ - -/* XXXX Some places assume that there is a fixed substring. - An update may be needed if optimizer marks as "INTUITable" - RExen without fixed substrings. Similarly, it is assumed that - lengths of all the strings are no more than minlen, thus they - cannot come from lookahead. - (Or minlen should take into account lookahead.) - NOTE: Some of this comment is not correct. minlen does now take account - of lookahead/behind. Further research is required. -- demerphq - -*/ - -/* A failure to find a constant substring means that there is no need to make - an expensive call to REx engine, thus we celebrate a failure. Similarly, - finding a substring too deep into the string means that less calls to - regtry() should be needed. - - REx compiler's optimizer found 4 possible hints: - a) Anchored substring; - b) Fixed substring; - c) Whether we are anchored (beginning-of-line or \G); - d) First node (of those at offset 0) which may distingush positions; - We use a)b)d) and multiline-part of c), and try to find a position in the - string which does not contradict any of them. - */ - -/* Most of decisions we do here should have been done at compile time. - The nodes of the REx which we used for the search should have been - deleted from the finite automaton. */ - -char * -Perl_re_intuit_start(pTHX_ REGEXP * const rx, SV *sv, char *strpos, - char *strend, const U32 flags, re_scream_pos_data *data) -{ - dVAR; - struct regexp *const prog = (struct regexp *)SvANY(rx); - register I32 start_shift = 0; - /* Should be nonnegative! */ - register I32 end_shift = 0; - register char *s; - register SV *check; - char *strbeg; - char *t; - const bool do_utf8 = (sv && SvUTF8(sv)) ? 1 : 0; /* if no sv we have to assume bytes */ - I32 ml_anch; - register char *other_last = NULL; /* other substr checked before this */ - char *check_at = NULL; /* check substr found at this pos */ - const I32 multiline = prog->extflags & RXf_PMf_MULTILINE; - RXi_GET_DECL(prog,progi); -#ifdef DEBUGGING - const char * const i_strpos = strpos; -#endif - GET_RE_DEBUG_FLAGS_DECL; - - PERL_ARGS_ASSERT_RE_INTUIT_START; - - RX_MATCH_UTF8_set(rx,do_utf8); - - if (RX_UTF8(rx)) { - PL_reg_flags |= RF_utf8; - } - DEBUG_EXECUTE_r( - debug_start_match(rx, do_utf8, strpos, strend, - sv ? "Guessing start of match in sv for" - : "Guessing start of match in string for"); - ); - - /* CHR_DIST() would be more correct here but it makes things slow. */ - if (prog->minlen > strend - strpos) { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - "String too short... [re_intuit_start]\n")); - goto fail; - } - - strbeg = (sv && SvPOK(sv)) ? strend - SvCUR(sv) : strpos; - PL_regeol = strend; - if (do_utf8) { - if (!prog->check_utf8 && prog->check_substr) - to_utf8_substr(prog); - check = prog->check_utf8; - } else { - if (!prog->check_substr && prog->check_utf8) - to_byte_substr(prog); - check = prog->check_substr; - } - if (check == &PL_sv_undef) { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - "Non-utf8 string cannot match utf8 check string\n")); - goto fail; - } - if (prog->extflags & RXf_ANCH) { /* Match at beg-of-str or after \n */ - ml_anch = !( (prog->extflags & RXf_ANCH_SINGLE) - || ( (prog->extflags & RXf_ANCH_BOL) - && !multiline ) ); /* Check after \n? */ - - if (!ml_anch) { - if ( !(prog->extflags & RXf_ANCH_GPOS) /* Checked by the caller */ - && !(prog->intflags & PREGf_IMPLICIT) /* not a real BOL */ - /* SvCUR is not set on references: SvRV and SvPVX_const overlap */ - && sv && !SvROK(sv) - && (strpos != strbeg)) { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Not at start...\n")); - goto fail; - } - if (prog->check_offset_min == prog->check_offset_max && - !(prog->extflags & RXf_CANY_SEEN)) { - /* Substring at constant offset from beg-of-str... */ - I32 slen; - - s = HOP3c(strpos, prog->check_offset_min, strend); - - if (SvTAIL(check)) { - slen = SvCUR(check); /* >= 1 */ - - if ( strend - s > slen || strend - s < slen - 1 - || (strend - s == slen && strend[-1] != '\n')) { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "String too long...\n")); - goto fail_finish; - } - /* Now should match s[0..slen-2] */ - slen--; - if (slen && (*SvPVX_const(check) != *s - || (slen > 1 - && memNE(SvPVX_const(check), s, slen)))) { - report_neq: - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "String not equal...\n")); - goto fail_finish; - } - } - else if (*SvPVX_const(check) != *s - || ((slen = SvCUR(check)) > 1 - && memNE(SvPVX_const(check), s, slen))) - goto report_neq; - check_at = s; - goto success_at_start; - } - } - /* Match is anchored, but substr is not anchored wrt beg-of-str. */ - s = strpos; - start_shift = prog->check_offset_min; /* okay to underestimate on CC */ - end_shift = prog->check_end_shift; - - if (!ml_anch) { - const I32 end = prog->check_offset_max + CHR_SVLEN(check) - - (SvTAIL(check) != 0); - const I32 eshift = CHR_DIST((U8*)strend, (U8*)s) - end; - - if (end_shift < eshift) - end_shift = eshift; - } - } - else { /* Can match at random position */ - ml_anch = 0; - s = strpos; - start_shift = prog->check_offset_min; /* okay to underestimate on CC */ - end_shift = prog->check_end_shift; - - /* end shift should be non negative here */ - } - -#ifdef QDEBUGGING /* 7/99: reports of failure (with the older version) */ - if (end_shift < 0) - Perl_croak(aTHX_ "panic: end_shift: %"IVdf" pattern:\n%s\n ", - (IV)end_shift, RX_PRECOMP(prog)); -#endif - - restart: - /* Find a possible match in the region s..strend by looking for - the "check" substring in the region corrected by start/end_shift. */ - - { - I32 srch_start_shift = start_shift; - I32 srch_end_shift = end_shift; - if (srch_start_shift < 0 && strbeg - s > srch_start_shift) { - srch_end_shift -= ((strbeg - s) - srch_start_shift); - srch_start_shift = strbeg - s; - } - DEBUG_OPTIMISE_MORE_r({ - PerlIO_printf(Perl_debug_log, "Check offset min: %"IVdf" Start shift: %"IVdf" End shift %"IVdf" Real End Shift: %"IVdf"\n", - (IV)prog->check_offset_min, - (IV)srch_start_shift, - (IV)srch_end_shift, - (IV)prog->check_end_shift); - }); - - if (flags & REXEC_SCREAM) { - I32 p = -1; /* Internal iterator of scream. */ - I32 * const pp = data ? data->scream_pos : &p; - - if (PL_screamfirst[BmRARE(check)] >= 0 - || ( BmRARE(check) == '\n' - && (BmPREVIOUS(check) == SvCUR(check) - 1) - && SvTAIL(check) )) - s = screaminstr(sv, check, - srch_start_shift + (s - strbeg), srch_end_shift, pp, 0); - else - goto fail_finish; - /* we may be pointing at the wrong string */ - if (s && RXp_MATCH_COPIED(prog)) - s = strbeg + (s - SvPVX_const(sv)); - if (data) - *data->scream_olds = s; - } - else { - U8* start_point; - U8* end_point; - if (prog->extflags & RXf_CANY_SEEN) { - start_point= (U8*)(s + srch_start_shift); - end_point= (U8*)(strend - srch_end_shift); - } else { - start_point= HOP3(s, srch_start_shift, srch_start_shift < 0 ? strbeg : strend); - end_point= HOP3(strend, -srch_end_shift, strbeg); - } - DEBUG_OPTIMISE_MORE_r({ - PerlIO_printf(Perl_debug_log, "fbm_instr len=%d str=<%.*s>\n", - (int)(end_point - start_point), - (int)(end_point - start_point) > 20 ? 20 : (int)(end_point - start_point), - start_point); - }); - - s = fbm_instr( start_point, end_point, - check, multiline ? FBMrf_MULTILINE : 0); - } - } - /* Update the count-of-usability, remove useless subpatterns, - unshift s. */ - - DEBUG_EXECUTE_r({ - RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), - SvPVX_const(check), RE_SV_DUMPLEN(check), 30); - PerlIO_printf(Perl_debug_log, "%s %s substr %s%s%s", - (s ? "Found" : "Did not find"), - (check == (do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) - ? "anchored" : "floating"), - quoted, - RE_SV_TAIL(check), - (s ? " at offset " : "...\n") ); - }); - - if (!s) - goto fail_finish; - /* Finish the diagnostic message */ - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%ld...\n", (long)(s - i_strpos)) ); - - /* XXX dmq: first branch is for positive lookbehind... - Our check string is offset from the beginning of the pattern. - So we need to do any stclass tests offset forward from that - point. I think. :-( - */ - - - - check_at=s; - - - /* Got a candidate. Check MBOL anchoring, and the *other* substr. - Start with the other substr. - XXXX no SCREAM optimization yet - and a very coarse implementation - XXXX /ttx+/ results in anchored="ttx", floating="x". floating will - *always* match. Probably should be marked during compile... - Probably it is right to do no SCREAM here... - */ - - if (do_utf8 ? (prog->float_utf8 && prog->anchored_utf8) - : (prog->float_substr && prog->anchored_substr)) - { - /* Take into account the "other" substring. */ - /* XXXX May be hopelessly wrong for UTF... */ - if (!other_last) - other_last = strpos; - if (check == (do_utf8 ? prog->float_utf8 : prog->float_substr)) { - do_other_anchored: - { - char * const last = HOP3c(s, -start_shift, strbeg); - char *last1, *last2; - char * const saved_s = s; - SV* must; - - t = s - prog->check_offset_max; - if (s - strpos > prog->check_offset_max /* signed-corrected t > strpos */ - && (!do_utf8 - || ((t = (char*)reghopmaybe3((U8*)s, -(prog->check_offset_max), (U8*)strpos)) - && t > strpos))) - NOOP; - else - t = strpos; - t = HOP3c(t, prog->anchored_offset, strend); - if (t < other_last) /* These positions already checked */ - t = other_last; - last2 = last1 = HOP3c(strend, -prog->minlen, strbeg); - if (last < last1) - last1 = last; - /* XXXX It is not documented what units *_offsets are in. - We assume bytes, but this is clearly wrong. - Meaning this code needs to be carefully reviewed for errors. - dmq. - */ - - /* On end-of-str: see comment below. */ - must = do_utf8 ? prog->anchored_utf8 : prog->anchored_substr; - if (must == &PL_sv_undef) { - s = (char*)NULL; - DEBUG_r(must = prog->anchored_utf8); /* for debug */ - } - else - s = fbm_instr( - (unsigned char*)t, - HOP3(HOP3(last1, prog->anchored_offset, strend) - + SvCUR(must), -(SvTAIL(must)!=0), strbeg), - must, - multiline ? FBMrf_MULTILINE : 0 - ); - DEBUG_EXECUTE_r({ - RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), - SvPVX_const(must), RE_SV_DUMPLEN(must), 30); - PerlIO_printf(Perl_debug_log, "%s anchored substr %s%s", - (s ? "Found" : "Contradicts"), - quoted, RE_SV_TAIL(must)); - }); - - - if (!s) { - if (last1 >= last2) { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - ", giving up...\n")); - goto fail_finish; - } - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - ", trying floating at offset %ld...\n", - (long)(HOP3c(saved_s, 1, strend) - i_strpos))); - other_last = HOP3c(last1, prog->anchored_offset+1, strend); - s = HOP3c(last, 1, strend); - goto restart; - } - else { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, " at offset %ld...\n", - (long)(s - i_strpos))); - t = HOP3c(s, -prog->anchored_offset, strbeg); - other_last = HOP3c(s, 1, strend); - s = saved_s; - if (t == strpos) - goto try_at_start; - goto try_at_offset; - } - } - } - else { /* Take into account the floating substring. */ - char *last, *last1; - char * const saved_s = s; - SV* must; - - t = HOP3c(s, -start_shift, strbeg); - last1 = last = - HOP3c(strend, -prog->minlen + prog->float_min_offset, strbeg); - if (CHR_DIST((U8*)last, (U8*)t) > prog->float_max_offset) - last = HOP3c(t, prog->float_max_offset, strend); - s = HOP3c(t, prog->float_min_offset, strend); - if (s < other_last) - s = other_last; - /* XXXX It is not documented what units *_offsets are in. Assume bytes. */ - must = do_utf8 ? prog->float_utf8 : prog->float_substr; - /* fbm_instr() takes into account exact value of end-of-str - if the check is SvTAIL(ed). Since false positives are OK, - and end-of-str is not later than strend we are OK. */ - if (must == &PL_sv_undef) { - s = (char*)NULL; - DEBUG_r(must = prog->float_utf8); /* for debug message */ - } - else - s = fbm_instr((unsigned char*)s, - (unsigned char*)last + SvCUR(must) - - (SvTAIL(must)!=0), - must, multiline ? FBMrf_MULTILINE : 0); - DEBUG_EXECUTE_r({ - RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), - SvPVX_const(must), RE_SV_DUMPLEN(must), 30); - PerlIO_printf(Perl_debug_log, "%s floating substr %s%s", - (s ? "Found" : "Contradicts"), - quoted, RE_SV_TAIL(must)); - }); - if (!s) { - if (last1 == last) { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - ", giving up...\n")); - goto fail_finish; - } - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - ", trying anchored starting at offset %ld...\n", - (long)(saved_s + 1 - i_strpos))); - other_last = last; - s = HOP3c(t, 1, strend); - goto restart; - } - else { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, " at offset %ld...\n", - (long)(s - i_strpos))); - other_last = s; /* Fix this later. --Hugo */ - s = saved_s; - if (t == strpos) - goto try_at_start; - goto try_at_offset; - } - } - } - - - t= (char*)HOP3( s, -prog->check_offset_max, (prog->check_offset_max<0) ? strend : strpos); - - DEBUG_OPTIMISE_MORE_r( - PerlIO_printf(Perl_debug_log, - "Check offset min:%"IVdf" max:%"IVdf" S:%"IVdf" t:%"IVdf" D:%"IVdf" end:%"IVdf"\n", - (IV)prog->check_offset_min, - (IV)prog->check_offset_max, - (IV)(s-strpos), - (IV)(t-strpos), - (IV)(t-s), - (IV)(strend-strpos) - ) - ); - - if (s - strpos > prog->check_offset_max /* signed-corrected t > strpos */ - && (!do_utf8 - || ((t = (char*)reghopmaybe3((U8*)s, -prog->check_offset_max, (U8*) ((prog->check_offset_max<0) ? strend : strpos))) - && t > strpos))) - { - /* Fixed substring is found far enough so that the match - cannot start at strpos. */ - try_at_offset: - if (ml_anch && t[-1] != '\n') { - /* Eventually fbm_*() should handle this, but often - anchored_offset is not 0, so this check will not be wasted. */ - /* XXXX In the code below we prefer to look for "^" even in - presence of anchored substrings. And we search even - beyond the found float position. These pessimizations - are historical artefacts only. */ - find_anchor: - while (t < strend - prog->minlen) { - if (*t == '\n') { - if (t < check_at - prog->check_offset_min) { - if (do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) { - /* Since we moved from the found position, - we definitely contradict the found anchored - substr. Due to the above check we do not - contradict "check" substr. - Thus we can arrive here only if check substr - is float. Redo checking for "other"=="fixed". - */ - strpos = t + 1; - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m at offset %ld, rescanning for anchored from offset %ld...\n", - PL_colors[0], PL_colors[1], (long)(strpos - i_strpos), (long)(strpos - i_strpos + prog->anchored_offset))); - goto do_other_anchored; - } - /* We don't contradict the found floating substring. */ - /* XXXX Why not check for STCLASS? */ - s = t + 1; - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m at offset %ld...\n", - PL_colors[0], PL_colors[1], (long)(s - i_strpos))); - goto set_useful; - } - /* Position contradicts check-string */ - /* XXXX probably better to look for check-string - than for "\n", so one should lower the limit for t? */ - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m, restarting lookup for check-string at offset %ld...\n", - PL_colors[0], PL_colors[1], (long)(t + 1 - i_strpos))); - other_last = strpos = s = t + 1; - goto restart; - } - t++; - } - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Did not find /%s^%s/m...\n", - PL_colors[0], PL_colors[1])); - goto fail_finish; - } - else { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Starting position does not contradict /%s^%s/m...\n", - PL_colors[0], PL_colors[1])); - } - s = t; - set_useful: - ++BmUSEFUL(do_utf8 ? prog->check_utf8 : prog->check_substr); /* hooray/5 */ - } - else { - /* The found string does not prohibit matching at strpos, - - no optimization of calling REx engine can be performed, - unless it was an MBOL and we are not after MBOL, - or a future STCLASS check will fail this. */ - try_at_start: - /* Even in this situation we may use MBOL flag if strpos is offset - wrt the start of the string. */ - if (ml_anch && sv && !SvROK(sv) /* See prev comment on SvROK */ - && (strpos != strbeg) && strpos[-1] != '\n' - /* May be due to an implicit anchor of m{.*foo} */ - && !(prog->intflags & PREGf_IMPLICIT)) - { - t = strpos; - goto find_anchor; - } - DEBUG_EXECUTE_r( if (ml_anch) - PerlIO_printf(Perl_debug_log, "Position at offset %ld does not contradict /%s^%s/m...\n", - (long)(strpos - i_strpos), PL_colors[0], PL_colors[1]); - ); - success_at_start: - if (!(prog->intflags & PREGf_NAUGHTY) /* XXXX If strpos moved? */ - && (do_utf8 ? ( - prog->check_utf8 /* Could be deleted already */ - && --BmUSEFUL(prog->check_utf8) < 0 - && (prog->check_utf8 == prog->float_utf8) - ) : ( - prog->check_substr /* Could be deleted already */ - && --BmUSEFUL(prog->check_substr) < 0 - && (prog->check_substr == prog->float_substr) - ))) - { - /* If flags & SOMETHING - do not do it many times on the same match */ - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "... Disabling check substring...\n")); - /* XXX Does the destruction order has to change with do_utf8? */ - SvREFCNT_dec(do_utf8 ? prog->check_utf8 : prog->check_substr); - SvREFCNT_dec(do_utf8 ? prog->check_substr : prog->check_utf8); - prog->check_substr = prog->check_utf8 = NULL; /* disable */ - prog->float_substr = prog->float_utf8 = NULL; /* clear */ - check = NULL; /* abort */ - s = strpos; - /* XXXX This is a remnant of the old implementation. It - looks wasteful, since now INTUIT can use many - other heuristics. */ - prog->extflags &= ~RXf_USE_INTUIT; - } - else - s = strpos; - } - - /* Last resort... */ - /* XXXX BmUSEFUL already changed, maybe multiple change is meaningful... */ - /* trie stclasses are too expensive to use here, we are better off to - leave it to regmatch itself */ - if (progi->regstclass && PL_regkind[OP(progi->regstclass)]!=TRIE) { - /* minlen == 0 is possible if regstclass is \b or \B, - and the fixed substr is ''$. - Since minlen is already taken into account, s+1 is before strend; - accidentally, minlen >= 1 guaranties no false positives at s + 1 - even for \b or \B. But (minlen? 1 : 0) below assumes that - regstclass does not come from lookahead... */ - /* If regstclass takes bytelength more than 1: If charlength==1, OK. - This leaves EXACTF only, which is dealt with in find_byclass(). */ - const U8* const str = (U8*)STRING(progi->regstclass); - const int cl_l = (PL_regkind[OP(progi->regstclass)] == EXACT - ? CHR_DIST(str+STR_LEN(progi->regstclass), str) - : 1); - char * endpos; - if (prog->anchored_substr || prog->anchored_utf8 || ml_anch) - endpos= HOP3c(s, (prog->minlen ? cl_l : 0), strend); - else if (prog->float_substr || prog->float_utf8) - endpos= HOP3c(HOP3c(check_at, -start_shift, strbeg), cl_l, strend); - else - endpos= strend; - - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "start_shift: %"IVdf" check_at: %"IVdf" s: %"IVdf" endpos: %"IVdf"\n", - (IV)start_shift, (IV)(check_at - strbeg), (IV)(s - strbeg), (IV)(endpos - strbeg))); - - t = s; - s = find_byclass(prog, progi->regstclass, s, endpos, NULL); - if (!s) { -#ifdef DEBUGGING - const char *what = NULL; -#endif - if (endpos == strend) { - DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, - "Could not match STCLASS...\n") ); - goto fail; - } - DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, - "This position contradicts STCLASS...\n") ); - if ((prog->extflags & RXf_ANCH) && !ml_anch) - goto fail; - /* Contradict one of substrings */ - if (prog->anchored_substr || prog->anchored_utf8) { - if ((do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) == check) { - DEBUG_EXECUTE_r( what = "anchored" ); - hop_and_restart: - s = HOP3c(t, 1, strend); - if (s + start_shift + end_shift > strend) { - /* XXXX Should be taken into account earlier? */ - DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, - "Could not match STCLASS...\n") ); - goto fail; - } - if (!check) - goto giveup; - DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, - "Looking for %s substr starting at offset %ld...\n", - what, (long)(s + start_shift - i_strpos)) ); - goto restart; - } - /* Have both, check_string is floating */ - if (t + start_shift >= check_at) /* Contradicts floating=check */ - goto retry_floating_check; - /* Recheck anchored substring, but not floating... */ - s = check_at; - if (!check) - goto giveup; - DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, - "Looking for anchored substr starting at offset %ld...\n", - (long)(other_last - i_strpos)) ); - goto do_other_anchored; - } - /* Another way we could have checked stclass at the - current position only: */ - if (ml_anch) { - s = t = t + 1; - if (!check) - goto giveup; - DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, - "Looking for /%s^%s/m starting at offset %ld...\n", - PL_colors[0], PL_colors[1], (long)(t - i_strpos)) ); - goto try_at_offset; - } - if (!(do_utf8 ? prog->float_utf8 : prog->float_substr)) /* Could have been deleted */ - goto fail; - /* Check is floating subtring. */ - retry_floating_check: - t = check_at - start_shift; - DEBUG_EXECUTE_r( what = "floating" ); - goto hop_and_restart; - } - if (t != s) { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - "By STCLASS: moving %ld --> %ld\n", - (long)(t - i_strpos), (long)(s - i_strpos)) - ); - } - else { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - "Does not contradict STCLASS...\n"); - ); - } - } - giveup: - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%s%s:%s match at offset %ld\n", - PL_colors[4], (check ? "Guessed" : "Giving up"), - PL_colors[5], (long)(s - i_strpos)) ); - return s; - - fail_finish: /* Substring not found */ - if (prog->check_substr || prog->check_utf8) /* could be removed already */ - BmUSEFUL(do_utf8 ? prog->check_utf8 : prog->check_substr) += 5; /* hooray */ - fail: - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch rejected by optimizer%s\n", - PL_colors[4], PL_colors[5])); - return NULL; -} - -#define DECL_TRIE_TYPE(scan) \ - const enum { trie_plain, trie_utf8, trie_utf8_fold, trie_latin_utf8_fold } \ - trie_type = (scan->flags != EXACT) \ - ? (do_utf8 ? trie_utf8_fold : (UTF ? trie_latin_utf8_fold : trie_plain)) \ - : (do_utf8 ? trie_utf8 : trie_plain) - -#define REXEC_TRIE_READ_CHAR(trie_type, trie, widecharmap, uc, uscan, len, \ -uvc, charid, foldlen, foldbuf, uniflags) STMT_START { \ - switch (trie_type) { \ - case trie_utf8_fold: \ - if ( foldlen>0 ) { \ - uvc = utf8n_to_uvuni( uscan, UTF8_MAXLEN, &len, uniflags ); \ - foldlen -= len; \ - uscan += len; \ - len=0; \ - } else { \ - uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags ); \ - uvc = to_uni_fold( uvc, foldbuf, &foldlen ); \ - foldlen -= UNISKIP( uvc ); \ - uscan = foldbuf + UNISKIP( uvc ); \ - } \ - break; \ - case trie_latin_utf8_fold: \ - if ( foldlen>0 ) { \ - uvc = utf8n_to_uvuni( uscan, UTF8_MAXLEN, &len, uniflags ); \ - foldlen -= len; \ - uscan += len; \ - len=0; \ - } else { \ - len = 1; \ - uvc = to_uni_fold( *(U8*)uc, foldbuf, &foldlen ); \ - foldlen -= UNISKIP( uvc ); \ - uscan = foldbuf + UNISKIP( uvc ); \ - } \ - break; \ - case trie_utf8: \ - uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags ); \ - break; \ - case trie_plain: \ - uvc = (UV)*uc; \ - len = 1; \ - } \ - if (uvc < 256) { \ - charid = trie->charmap[ uvc ]; \ - } \ - else { \ - charid = 0; \ - if (widecharmap) { \ - SV** const svpp = hv_fetch(widecharmap, \ - (char*)&uvc, sizeof(UV), 0); \ - if (svpp) \ - charid = (U16)SvIV(*svpp); \ - } \ - } \ -} STMT_END - -#define REXEC_FBC_EXACTISH_CHECK(CoNd) \ -{ \ - char *my_strend= (char *)strend; \ - if ( (CoNd) \ - && (ln == len || \ - !ibcmp_utf8(s, &my_strend, 0, do_utf8, \ - m, NULL, ln, (bool)UTF)) \ - && (!reginfo || regtry(reginfo, &s)) ) \ - goto got_it; \ - else { \ - U8 foldbuf[UTF8_MAXBYTES_CASE+1]; \ - uvchr_to_utf8(tmpbuf, c); \ - f = to_utf8_fold(tmpbuf, foldbuf, &foldlen); \ - if ( f != c \ - && (f == c1 || f == c2) \ - && (ln == len || \ - !ibcmp_utf8(s, &my_strend, 0, do_utf8,\ - m, NULL, ln, (bool)UTF)) \ - && (!reginfo || regtry(reginfo, &s)) ) \ - goto got_it; \ - } \ -} \ -s += len - -#define REXEC_FBC_EXACTISH_SCAN(CoNd) \ -STMT_START { \ - while (s <= e) { \ - if ( (CoNd) \ - && (ln == 1 || !(OP(c) == EXACTF \ - ? ibcmp(s, m, ln) \ - : ibcmp_locale(s, m, ln))) \ - && (!reginfo || regtry(reginfo, &s)) ) \ - goto got_it; \ - s++; \ - } \ -} STMT_END - -#define REXEC_FBC_UTF8_SCAN(CoDe) \ -STMT_START { \ - while (s + (uskip = UTF8SKIP(s)) <= strend) { \ - CoDe \ - s += uskip; \ - } \ -} STMT_END - -#define REXEC_FBC_SCAN(CoDe) \ -STMT_START { \ - while (s < strend) { \ - CoDe \ - s++; \ - } \ -} STMT_END - -#define REXEC_FBC_UTF8_CLASS_SCAN(CoNd) \ -REXEC_FBC_UTF8_SCAN( \ - if (CoNd) { \ - if (tmp && (!reginfo || regtry(reginfo, &s))) \ - goto got_it; \ - else \ - tmp = doevery; \ - } \ - else \ - tmp = 1; \ -) - -#define REXEC_FBC_CLASS_SCAN(CoNd) \ -REXEC_FBC_SCAN( \ - if (CoNd) { \ - if (tmp && (!reginfo || regtry(reginfo, &s))) \ - goto got_it; \ - else \ - tmp = doevery; \ - } \ - else \ - tmp = 1; \ -) - -#define REXEC_FBC_TRYIT \ -if ((!reginfo || regtry(reginfo, &s))) \ - goto got_it - -#define REXEC_FBC_CSCAN(CoNdUtF8,CoNd) \ - if (do_utf8) { \ - REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8); \ - } \ - else { \ - REXEC_FBC_CLASS_SCAN(CoNd); \ - } \ - break - -#define REXEC_FBC_CSCAN_PRELOAD(UtFpReLoAd,CoNdUtF8,CoNd) \ - if (do_utf8) { \ - UtFpReLoAd; \ - REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8); \ - } \ - else { \ - REXEC_FBC_CLASS_SCAN(CoNd); \ - } \ - break - -#define REXEC_FBC_CSCAN_TAINT(CoNdUtF8,CoNd) \ - PL_reg_flags |= RF_tainted; \ - if (do_utf8) { \ - REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8); \ - } \ - else { \ - REXEC_FBC_CLASS_SCAN(CoNd); \ - } \ - break - -#define DUMP_EXEC_POS(li,s,doutf8) \ - dump_exec_pos(li,s,(PL_regeol),(PL_bostr),(PL_reg_starttry),doutf8) - -/* We know what class REx starts with. Try to find this position... */ -/* if reginfo is NULL, its a dryrun */ -/* annoyingly all the vars in this routine have different names from their counterparts - in regmatch. /grrr */ - -STATIC char * -S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s, - const char *strend, regmatch_info *reginfo) -{ - dVAR; - const I32 doevery = (prog->intflags & PREGf_SKIP) == 0; - char *m; - STRLEN ln; - STRLEN lnc; - register STRLEN uskip; - unsigned int c1; - unsigned int c2; - char *e; - register I32 tmp = 1; /* Scratch variable? */ - register const bool do_utf8 = PL_reg_match_utf8; - RXi_GET_DECL(prog,progi); - - PERL_ARGS_ASSERT_FIND_BYCLASS; - - /* We know what class it must start with. */ - switch (OP(c)) { - case ANYOF: - if (do_utf8) { - REXEC_FBC_UTF8_CLASS_SCAN((ANYOF_FLAGS(c) & ANYOF_UNICODE) || - !UTF8_IS_INVARIANT((U8)s[0]) ? - reginclass(prog, c, (U8*)s, 0, do_utf8) : - REGINCLASS(prog, c, (U8*)s)); - } - else { - while (s < strend) { - STRLEN skip = 1; - - if (REGINCLASS(prog, c, (U8*)s) || - (ANYOF_FOLD_SHARP_S(c, s, strend) && - /* The assignment of 2 is intentional: - * for the folded sharp s, the skip is 2. */ - (skip = SHARP_S_SKIP))) { - if (tmp && (!reginfo || regtry(reginfo, &s))) - goto got_it; - else - tmp = doevery; - } - else - tmp = 1; - s += skip; - } - } - break; - case CANY: - REXEC_FBC_SCAN( - if (tmp && (!reginfo || regtry(reginfo, &s))) - goto got_it; - else - tmp = doevery; - ); - break; - case EXACTF: - m = STRING(c); - ln = STR_LEN(c); /* length to match in octets/bytes */ - lnc = (I32) ln; /* length to match in characters */ - if (UTF) { - STRLEN ulen1, ulen2; - U8 *sm = (U8 *) m; - U8 tmpbuf1[UTF8_MAXBYTES_CASE+1]; - U8 tmpbuf2[UTF8_MAXBYTES_CASE+1]; - /* used by commented-out code below */ - /*const U32 uniflags = UTF8_ALLOW_DEFAULT;*/ - - /* XXX: Since the node will be case folded at compile - time this logic is a little odd, although im not - sure that its actually wrong. --dmq */ - - c1 = to_utf8_lower((U8*)m, tmpbuf1, &ulen1); - c2 = to_utf8_upper((U8*)m, tmpbuf2, &ulen2); - - /* XXX: This is kinda strange. to_utf8_XYZ returns the - codepoint of the first character in the converted - form, yet originally we did the extra step. - No tests fail by commenting this code out however - so Ive left it out. -- dmq. - - c1 = utf8n_to_uvchr(tmpbuf1, UTF8_MAXBYTES_CASE, - 0, uniflags); - c2 = utf8n_to_uvchr(tmpbuf2, UTF8_MAXBYTES_CASE, - 0, uniflags); - */ - - lnc = 0; - while (sm < ((U8 *) m + ln)) { - lnc++; - sm += UTF8SKIP(sm); - } - } - else { - c1 = *(U8*)m; - c2 = PL_fold[c1]; - } - goto do_exactf; - case EXACTFL: - m = STRING(c); - ln = STR_LEN(c); - lnc = (I32) ln; - c1 = *(U8*)m; - c2 = PL_fold_locale[c1]; - do_exactf: - e = HOP3c(strend, -((I32)lnc), s); - - if (!reginfo && e < s) - e = s; /* Due to minlen logic of intuit() */ - - /* The idea in the EXACTF* cases is to first find the - * first character of the EXACTF* node and then, if - * necessary, case-insensitively compare the full - * text of the node. The c1 and c2 are the first - * characters (though in Unicode it gets a bit - * more complicated because there are more cases - * than just upper and lower: one needs to use - * the so-called folding case for case-insensitive - * matching (called "loose matching" in Unicode). - * ibcmp_utf8() will do just that. */ - - if (do_utf8 || UTF) { - UV c, f; - U8 tmpbuf [UTF8_MAXBYTES+1]; - STRLEN len = 1; - STRLEN foldlen; - const U32 uniflags = UTF8_ALLOW_DEFAULT; - if (c1 == c2) { - /* Upper and lower of 1st char are equal - - * probably not a "letter". */ - while (s <= e) { - if (do_utf8) { - c = utf8n_to_uvchr((U8*)s, UTF8_MAXBYTES, &len, - uniflags); - } else { - c = *((U8*)s); - } - REXEC_FBC_EXACTISH_CHECK(c == c1); - } - } - else { - while (s <= e) { - if (do_utf8) { - c = utf8n_to_uvchr((U8*)s, UTF8_MAXBYTES, &len, - uniflags); - } else { - c = *((U8*)s); - } - - /* Handle some of the three Greek sigmas cases. - * Note that not all the possible combinations - * are handled here: some of them are handled - * by the standard folding rules, and some of - * them (the character class or ANYOF cases) - * are handled during compiletime in - * regexec.c:S_regclass(). */ - if (c == (UV)UNICODE_GREEK_CAPITAL_LETTER_SIGMA || - c == (UV)UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA) - c = (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA; - - REXEC_FBC_EXACTISH_CHECK(c == c1 || c == c2); - } - } - } - else { - /* Neither pattern nor string are UTF8 */ - if (c1 == c2) - REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1); - else - REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1 || *(U8*)s == c2); - } - break; - case BOUNDL: - PL_reg_flags |= RF_tainted; - /* FALL THROUGH */ - case BOUND: - if (do_utf8) { - if (s == PL_bostr) - tmp = '\n'; - else { - U8 * const r = reghop3((U8*)s, -1, (U8*)PL_bostr); - tmp = utf8n_to_uvchr(r, UTF8SKIP(r), 0, UTF8_ALLOW_DEFAULT); - } - tmp = ((OP(c) == BOUND ? - isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0); - LOAD_UTF8_CHARCLASS_ALNUM(); - REXEC_FBC_UTF8_SCAN( - if (tmp == !(OP(c) == BOUND ? - (bool)swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) : - isALNUM_LC_utf8((U8*)s))) - { - tmp = !tmp; - REXEC_FBC_TRYIT; - } - ); - } - else { - tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n'; - tmp = ((OP(c) == BOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0); - REXEC_FBC_SCAN( - if (tmp == - !(OP(c) == BOUND ? isALNUM(*s) : isALNUM_LC(*s))) { - tmp = !tmp; - REXEC_FBC_TRYIT; - } - ); - } - if ((!prog->minlen && tmp) && (!reginfo || regtry(reginfo, &s))) - goto got_it; - break; - case NBOUNDL: - PL_reg_flags |= RF_tainted; - /* FALL THROUGH */ - case NBOUND: - if (do_utf8) { - if (s == PL_bostr) - tmp = '\n'; - else { - U8 * const r = reghop3((U8*)s, -1, (U8*)PL_bostr); - tmp = utf8n_to_uvchr(r, UTF8SKIP(r), 0, UTF8_ALLOW_DEFAULT); - } - tmp = ((OP(c) == NBOUND ? - isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0); - LOAD_UTF8_CHARCLASS_ALNUM(); - REXEC_FBC_UTF8_SCAN( - if (tmp == !(OP(c) == NBOUND ? - (bool)swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) : - isALNUM_LC_utf8((U8*)s))) - tmp = !tmp; - else REXEC_FBC_TRYIT; - ); - } - else { - tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n'; - tmp = ((OP(c) == NBOUND ? - isALNUM(tmp) : isALNUM_LC(tmp)) != 0); - REXEC_FBC_SCAN( - if (tmp == - !(OP(c) == NBOUND ? isALNUM(*s) : isALNUM_LC(*s))) - tmp = !tmp; - else REXEC_FBC_TRYIT; - ); - } - if ((!prog->minlen && !tmp) && (!reginfo || regtry(reginfo, &s))) - goto got_it; - break; - case ALNUM: - REXEC_FBC_CSCAN_PRELOAD( - LOAD_UTF8_CHARCLASS_PERL_WORD(), - swash_fetch(RE_utf8_perl_word, (U8*)s, do_utf8), - isALNUM(*s) - ); - case ALNUML: - REXEC_FBC_CSCAN_TAINT( - isALNUM_LC_utf8((U8*)s), - isALNUM_LC(*s) - ); - case NALNUM: - REXEC_FBC_CSCAN_PRELOAD( - LOAD_UTF8_CHARCLASS_PERL_WORD(), - !swash_fetch(RE_utf8_perl_word, (U8*)s, do_utf8), - !isALNUM(*s) - ); - case NALNUML: - REXEC_FBC_CSCAN_TAINT( - !isALNUM_LC_utf8((U8*)s), - !isALNUM_LC(*s) - ); - case SPACE: - REXEC_FBC_CSCAN_PRELOAD( - LOAD_UTF8_CHARCLASS_PERL_SPACE(), - *s == ' ' || swash_fetch(RE_utf8_perl_space,(U8*)s, do_utf8), - isSPACE(*s) - ); - case SPACEL: - REXEC_FBC_CSCAN_TAINT( - *s == ' ' || isSPACE_LC_utf8((U8*)s), - isSPACE_LC(*s) - ); - case NSPACE: - REXEC_FBC_CSCAN_PRELOAD( - LOAD_UTF8_CHARCLASS_PERL_SPACE(), - !(*s == ' ' || swash_fetch(RE_utf8_perl_space,(U8*)s, do_utf8)), - !isSPACE(*s) - ); - case NSPACEL: - REXEC_FBC_CSCAN_TAINT( - !(*s == ' ' || isSPACE_LC_utf8((U8*)s)), - !isSPACE_LC(*s) - ); - case DIGIT: - REXEC_FBC_CSCAN_PRELOAD( - LOAD_UTF8_CHARCLASS_POSIX_DIGIT(), - swash_fetch(RE_utf8_posix_digit,(U8*)s, do_utf8), - isDIGIT(*s) - ); - case DIGITL: - REXEC_FBC_CSCAN_TAINT( - isDIGIT_LC_utf8((U8*)s), - isDIGIT_LC(*s) - ); - case NDIGIT: - REXEC_FBC_CSCAN_PRELOAD( - LOAD_UTF8_CHARCLASS_POSIX_DIGIT(), - !swash_fetch(RE_utf8_posix_digit,(U8*)s, do_utf8), - !isDIGIT(*s) - ); - case NDIGITL: - REXEC_FBC_CSCAN_TAINT( - !isDIGIT_LC_utf8((U8*)s), - !isDIGIT_LC(*s) - ); - case LNBREAK: - REXEC_FBC_CSCAN( - is_LNBREAK_utf8(s), - is_LNBREAK_latin1(s) - ); - case VERTWS: - REXEC_FBC_CSCAN( - is_VERTWS_utf8(s), - is_VERTWS_latin1(s) - ); - case NVERTWS: - REXEC_FBC_CSCAN( - !is_VERTWS_utf8(s), - !is_VERTWS_latin1(s) - ); - case HORIZWS: - REXEC_FBC_CSCAN( - is_HORIZWS_utf8(s), - is_HORIZWS_latin1(s) - ); - case NHORIZWS: - REXEC_FBC_CSCAN( - !is_HORIZWS_utf8(s), - !is_HORIZWS_latin1(s) - ); - case AHOCORASICKC: - case AHOCORASICK: - { - DECL_TRIE_TYPE(c); - /* what trie are we using right now */ - reg_ac_data *aho - = (reg_ac_data*)progi->data->data[ ARG( c ) ]; - reg_trie_data *trie - = (reg_trie_data*)progi->data->data[ aho->trie ]; - HV *widecharmap = MUTABLE_HV(progi->data->data[ aho->trie + 1 ]); - - const char *last_start = strend - trie->minlen; -#ifdef DEBUGGING - const char *real_start = s; -#endif - STRLEN maxlen = trie->maxlen; - SV *sv_points; - U8 **points; /* map of where we were in the input string - when reading a given char. For ASCII this - is unnecessary overhead as the relationship - is always 1:1, but for Unicode, especially - case folded Unicode this is not true. */ - U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ]; - U8 *bitmap=NULL; - - - GET_RE_DEBUG_FLAGS_DECL; - - /* We can't just allocate points here. We need to wrap it in - * an SV so it gets freed properly if there is a croak while - * running the match */ - ENTER; - SAVETMPS; - sv_points=newSV(maxlen * sizeof(U8 *)); - SvCUR_set(sv_points, - maxlen * sizeof(U8 *)); - SvPOK_on(sv_points); - sv_2mortal(sv_points); - points=(U8**)SvPV_nolen(sv_points ); - if ( trie_type != trie_utf8_fold - && (trie->bitmap || OP(c)==AHOCORASICKC) ) - { - if (trie->bitmap) - bitmap=(U8*)trie->bitmap; - else - bitmap=(U8*)ANYOF_BITMAP(c); - } - /* this is the Aho-Corasick algorithm modified a touch - to include special handling for long "unknown char" - sequences. The basic idea being that we use AC as long - as we are dealing with a possible matching char, when - we encounter an unknown char (and we have not encountered - an accepting state) we scan forward until we find a legal - starting char. - AC matching is basically that of trie matching, except - that when we encounter a failing transition, we fall back - to the current states "fail state", and try the current char - again, a process we repeat until we reach the root state, - state 1, or a legal transition. If we fail on the root state - then we can either terminate if we have reached an accepting - state previously, or restart the entire process from the beginning - if we have not. - - */ - while (s <= last_start) { - const U32 uniflags = UTF8_ALLOW_DEFAULT; - U8 *uc = (U8*)s; - U16 charid = 0; - U32 base = 1; - U32 state = 1; - UV uvc = 0; - STRLEN len = 0; - STRLEN foldlen = 0; - U8 *uscan = (U8*)NULL; - U8 *leftmost = NULL; -#ifdef DEBUGGING - U32 accepted_word= 0; -#endif - U32 pointpos = 0; - - while ( state && uc <= (U8*)strend ) { - int failed=0; - U32 word = aho->states[ state ].wordnum; - - if( state==1 ) { - if ( bitmap ) { - DEBUG_TRIE_EXECUTE_r( - if ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) { - dump_exec_pos( (char *)uc, c, strend, real_start, - (char *)uc, do_utf8 ); - PerlIO_printf( Perl_debug_log, - " Scanning for legal start char...\n"); - } - ); - while ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) { - uc++; - } - s= (char *)uc; - } - if (uc >(U8*)last_start) break; - } - - if ( word ) { - U8 *lpos= points[ (pointpos - trie->wordlen[word-1] ) % maxlen ]; - if (!leftmost || lpos < leftmost) { - DEBUG_r(accepted_word=word); - leftmost= lpos; - } - if (base==0) break; - - } - points[pointpos++ % maxlen]= uc; - REXEC_TRIE_READ_CHAR(trie_type, trie, widecharmap, uc, - uscan, len, uvc, charid, foldlen, - foldbuf, uniflags); - DEBUG_TRIE_EXECUTE_r({ - dump_exec_pos( (char *)uc, c, strend, real_start, - s, do_utf8 ); - PerlIO_printf(Perl_debug_log, - " Charid:%3u CP:%4"UVxf" ", - charid, uvc); - }); - - do { -#ifdef DEBUGGING - word = aho->states[ state ].wordnum; -#endif - base = aho->states[ state ].trans.base; - - DEBUG_TRIE_EXECUTE_r({ - if (failed) - dump_exec_pos( (char *)uc, c, strend, real_start, - s, do_utf8 ); - PerlIO_printf( Perl_debug_log, - "%sState: %4"UVxf", word=%"UVxf, - failed ? " Fail transition to " : "", - (UV)state, (UV)word); - }); - if ( base ) { - U32 tmp; - if (charid && - (base + charid > trie->uniquecharcount ) - && (base + charid - 1 - trie->uniquecharcount - < trie->lasttrans) - && trie->trans[base + charid - 1 - - trie->uniquecharcount].check == state - && (tmp=trie->trans[base + charid - 1 - - trie->uniquecharcount ].next)) - { - DEBUG_TRIE_EXECUTE_r( - PerlIO_printf( Perl_debug_log," - legal\n")); - state = tmp; - break; - } - else { - DEBUG_TRIE_EXECUTE_r( - PerlIO_printf( Perl_debug_log," - fail\n")); - failed = 1; - state = aho->fail[state]; - } - } - else { - /* we must be accepting here */ - DEBUG_TRIE_EXECUTE_r( - PerlIO_printf( Perl_debug_log," - accepting\n")); - failed = 1; - break; - } - } while(state); - uc += len; - if (failed) { - if (leftmost) - break; - if (!state) state = 1; - } - } - if ( aho->states[ state ].wordnum ) { - U8 *lpos = points[ (pointpos - trie->wordlen[aho->states[ state ].wordnum-1]) % maxlen ]; - if (!leftmost || lpos < leftmost) { - DEBUG_r(accepted_word=aho->states[ state ].wordnum); - leftmost = lpos; - } - } - if (leftmost) { - s = (char*)leftmost; - DEBUG_TRIE_EXECUTE_r({ - PerlIO_printf( - Perl_debug_log,"Matches word #%"UVxf" at position %"IVdf". Trying full pattern...\n", - (UV)accepted_word, (IV)(s - real_start) - ); - }); - if (!reginfo || regtry(reginfo, &s)) { - FREETMPS; - LEAVE; - goto got_it; - } - s = HOPc(s,1); - DEBUG_TRIE_EXECUTE_r({ - PerlIO_printf( Perl_debug_log,"Pattern failed. Looking for new start point...\n"); - }); - } else { - DEBUG_TRIE_EXECUTE_r( - PerlIO_printf( Perl_debug_log,"No match.\n")); - break; - } - } - FREETMPS; - LEAVE; - } - break; - default: - Perl_croak(aTHX_ "panic: unknown regstclass %d", (int)OP(c)); - break; - } - return 0; - got_it: - return s; -} - - -/* - - regexec_flags - match a regexp against a string - */ -I32 -Perl_regexec_flags(pTHX_ REGEXP * const rx, char *stringarg, register char *strend, - char *strbeg, I32 minend, SV *sv, void *data, U32 flags) -/* strend: pointer to null at end of string */ -/* strbeg: real beginning of string */ -/* minend: end of match must be >=minend after stringarg. */ -/* data: May be used for some additional optimizations. - Currently its only used, with a U32 cast, for transmitting - the ganch offset when doing a /g match. This will change */ -/* nosave: For optimizations. */ -{ - dVAR; - struct regexp *const prog = (struct regexp *)SvANY(rx); - /*register*/ char *s; - register regnode *c; - /*register*/ char *startpos = stringarg; - I32 minlen; /* must match at least this many chars */ - I32 dontbother = 0; /* how many characters not to try at end */ - I32 end_shift = 0; /* Same for the end. */ /* CC */ - I32 scream_pos = -1; /* Internal iterator of scream. */ - char *scream_olds = NULL; - const bool do_utf8 = (bool)DO_UTF8(sv); - I32 multiline; - RXi_GET_DECL(prog,progi); - regmatch_info reginfo; /* create some info to pass to regtry etc */ - regexp_paren_pair *swap = NULL; - GET_RE_DEBUG_FLAGS_DECL; - - PERL_ARGS_ASSERT_REGEXEC_FLAGS; - PERL_UNUSED_ARG(data); - - /* Be paranoid... */ - if (prog == NULL || startpos == NULL) { - Perl_croak(aTHX_ "NULL regexp parameter"); - return 0; - } - - multiline = prog->extflags & RXf_PMf_MULTILINE; - reginfo.prog = rx; /* Yes, sorry that this is confusing. */ - - RX_MATCH_UTF8_set(rx, do_utf8); - DEBUG_EXECUTE_r( - debug_start_match(rx, do_utf8, startpos, strend, - "Matching"); - ); - - minlen = prog->minlen; - - if (strend - startpos < (minlen+(prog->check_offset_min<0?prog->check_offset_min:0))) { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - "String too short [regexec_flags]...\n")); - goto phooey; - } - - - /* Check validity of program. */ - if (UCHARAT(progi->program) != REG_MAGIC) { - Perl_croak(aTHX_ "corrupted regexp program"); - } - - PL_reg_flags = 0; - PL_reg_eval_set = 0; - PL_reg_maxiter = 0; - - if (RX_UTF8(rx)) - PL_reg_flags |= RF_utf8; - - /* Mark beginning of line for ^ and lookbehind. */ - reginfo.bol = startpos; /* XXX not used ??? */ - PL_bostr = strbeg; - reginfo.sv = sv; - - /* Mark end of line for $ (and such) */ - PL_regeol = strend; - - /* see how far we have to get to not match where we matched before */ - reginfo.till = startpos+minend; - - /* If there is a "must appear" string, look for it. */ - s = startpos; - - if (prog->extflags & RXf_GPOS_SEEN) { /* Need to set reginfo->ganch */ - MAGIC *mg; - if (flags & REXEC_IGNOREPOS){ /* Means: check only at start */ - reginfo.ganch = startpos + prog->gofs; - DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log, - "GPOS IGNOREPOS: reginfo.ganch = startpos + %"UVxf"\n",(UV)prog->gofs)); - } else if (sv && SvTYPE(sv) >= SVt_PVMG - && SvMAGIC(sv) - && (mg = mg_find(sv, PERL_MAGIC_regex_global)) - && mg->mg_len >= 0) { - reginfo.ganch = strbeg + mg->mg_len; /* Defined pos() */ - DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log, - "GPOS MAGIC: reginfo.ganch = strbeg + %"IVdf"\n",(IV)mg->mg_len)); - - if (prog->extflags & RXf_ANCH_GPOS) { - if (s > reginfo.ganch) - goto phooey; - s = reginfo.ganch - prog->gofs; - DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log, - "GPOS ANCH_GPOS: s = ganch - %"UVxf"\n",(UV)prog->gofs)); - if (s < strbeg) - goto phooey; - } - } - else if (data) { - reginfo.ganch = strbeg + PTR2UV(data); - DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log, - "GPOS DATA: reginfo.ganch= strbeg + %"UVxf"\n",PTR2UV(data))); - - } else { /* pos() not defined */ - reginfo.ganch = strbeg; - DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log, - "GPOS: reginfo.ganch = strbeg\n")); - } - } - if (PL_curpm && (PM_GETRE(PL_curpm) == rx)) { - /* We have to be careful. If the previous successful match - was from this regex we don't want a subsequent partially - successful match to clobber the old results. - So when we detect this possibility we add a swap buffer - to the re, and switch the buffer each match. If we fail - we switch it back, otherwise we leave it swapped. - */ - swap = prog->offs; - /* do we need a save destructor here for eval dies? */ - Newxz(prog->offs, (prog->nparens + 1), regexp_paren_pair); - } - if (!(flags & REXEC_CHECKED) && (prog->check_substr != NULL || prog->check_utf8 != NULL)) { - re_scream_pos_data d; - - d.scream_olds = &scream_olds; - d.scream_pos = &scream_pos; - s = re_intuit_start(rx, sv, s, strend, flags, &d); - if (!s) { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Not present...\n")); - goto phooey; /* not present */ - } - } - - - - /* Simplest case: anchored match need be tried only once. */ - /* [unless only anchor is BOL and multiline is set] */ - if (prog->extflags & (RXf_ANCH & ~RXf_ANCH_GPOS)) { - if (s == startpos && regtry(®info, &startpos)) - goto got_it; - else if (multiline || (prog->intflags & PREGf_IMPLICIT) - || (prog->extflags & RXf_ANCH_MBOL)) /* XXXX SBOL? */ - { - char *end; - - if (minlen) - dontbother = minlen - 1; - end = HOP3c(strend, -dontbother, strbeg) - 1; - /* for multiline we only have to try after newlines */ - if (prog->check_substr || prog->check_utf8) { - if (s == startpos) - goto after_try; - while (1) { - if (regtry(®info, &s)) - goto got_it; - after_try: - if (s > end) - goto phooey; - if (prog->extflags & RXf_USE_INTUIT) { - s = re_intuit_start(rx, sv, s + 1, strend, flags, NULL); - if (!s) - goto phooey; - } - else - s++; - } - } else { - if (s > startpos) - s--; - while (s < end) { - if (*s++ == '\n') { /* don't need PL_utf8skip here */ - if (regtry(®info, &s)) - goto got_it; - } - } - } - } - goto phooey; - } else if (RXf_GPOS_CHECK == (prog->extflags & RXf_GPOS_CHECK)) - { - /* the warning about reginfo.ganch being used without intialization - is bogus -- we set it above, when prog->extflags & RXf_GPOS_SEEN - and we only enter this block when the same bit is set. */ - char *tmp_s = reginfo.ganch - prog->gofs; - - if (tmp_s >= strbeg && regtry(®info, &tmp_s)) - goto got_it; - goto phooey; - } - - /* Messy cases: unanchored match. */ - if ((prog->anchored_substr || prog->anchored_utf8) && prog->intflags & PREGf_SKIP) { - /* we have /x+whatever/ */ - /* it must be a one character string (XXXX Except UTF?) */ - char ch; -#ifdef DEBUGGING - int did_match = 0; -#endif - if (!(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)) - do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); - ch = SvPVX_const(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)[0]; - - if (do_utf8) { - REXEC_FBC_SCAN( - if (*s == ch) { - DEBUG_EXECUTE_r( did_match = 1 ); - if (regtry(®info, &s)) goto got_it; - s += UTF8SKIP(s); - while (s < strend && *s == ch) - s += UTF8SKIP(s); - } - ); - } - else { - REXEC_FBC_SCAN( - if (*s == ch) { - DEBUG_EXECUTE_r( did_match = 1 ); - if (regtry(®info, &s)) goto got_it; - s++; - while (s < strend && *s == ch) - s++; - } - ); - } - DEBUG_EXECUTE_r(if (!did_match) - PerlIO_printf(Perl_debug_log, - "Did not find anchored character...\n") - ); - } - else if (prog->anchored_substr != NULL - || prog->anchored_utf8 != NULL - || ((prog->float_substr != NULL || prog->float_utf8 != NULL) - && prog->float_max_offset < strend - s)) { - SV *must; - I32 back_max; - I32 back_min; - char *last; - char *last1; /* Last position checked before */ -#ifdef DEBUGGING - int did_match = 0; -#endif - if (prog->anchored_substr || prog->anchored_utf8) { - if (!(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)) - do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); - must = do_utf8 ? prog->anchored_utf8 : prog->anchored_substr; - back_max = back_min = prog->anchored_offset; - } else { - if (!(do_utf8 ? prog->float_utf8 : prog->float_substr)) - do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); - must = do_utf8 ? prog->float_utf8 : prog->float_substr; - back_max = prog->float_max_offset; - back_min = prog->float_min_offset; - } - - - if (must == &PL_sv_undef) - /* could not downgrade utf8 check substring, so must fail */ - goto phooey; - - if (back_min<0) { - last = strend; - } else { - last = HOP3c(strend, /* Cannot start after this */ - -(I32)(CHR_SVLEN(must) - - (SvTAIL(must) != 0) + back_min), strbeg); - } - if (s > PL_bostr) - last1 = HOPc(s, -1); - else - last1 = s - 1; /* bogus */ - - /* XXXX check_substr already used to find "s", can optimize if - check_substr==must. */ - scream_pos = -1; - dontbother = end_shift; - strend = HOPc(strend, -dontbother); - while ( (s <= last) && - ((flags & REXEC_SCREAM) - ? (s = screaminstr(sv, must, HOP3c(s, back_min, (back_min<0 ? strbeg : strend)) - strbeg, - end_shift, &scream_pos, 0)) - : (s = fbm_instr((unsigned char*)HOP3(s, back_min, (back_min<0 ? strbeg : strend)), - (unsigned char*)strend, must, - multiline ? FBMrf_MULTILINE : 0))) ) { - /* we may be pointing at the wrong string */ - if ((flags & REXEC_SCREAM) && RXp_MATCH_COPIED(prog)) - s = strbeg + (s - SvPVX_const(sv)); - DEBUG_EXECUTE_r( did_match = 1 ); - if (HOPc(s, -back_max) > last1) { - last1 = HOPc(s, -back_min); - s = HOPc(s, -back_max); - } - else { - char * const t = (last1 >= PL_bostr) ? HOPc(last1, 1) : last1 + 1; - - last1 = HOPc(s, -back_min); - s = t; - } - if (do_utf8) { - while (s <= last1) { - if (regtry(®info, &s)) - goto got_it; - s += UTF8SKIP(s); - } - } - else { - while (s <= last1) { - if (regtry(®info, &s)) - goto got_it; - s++; - } - } - } - DEBUG_EXECUTE_r(if (!did_match) { - RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), - SvPVX_const(must), RE_SV_DUMPLEN(must), 30); - PerlIO_printf(Perl_debug_log, "Did not find %s substr %s%s...\n", - ((must == prog->anchored_substr || must == prog->anchored_utf8) - ? "anchored" : "floating"), - quoted, RE_SV_TAIL(must)); - }); - goto phooey; - } - else if ( (c = progi->regstclass) ) { - if (minlen) { - const OPCODE op = OP(progi->regstclass); - /* don't bother with what can't match */ - if (PL_regkind[op] != EXACT && op != CANY && PL_regkind[op] != TRIE) - strend = HOPc(strend, -(minlen - 1)); - } - DEBUG_EXECUTE_r({ - SV * const prop = sv_newmortal(); - regprop(prog, prop, c); - { - RE_PV_QUOTED_DECL(quoted,do_utf8,PERL_DEBUG_PAD_ZERO(1), - s,strend-s,60); - PerlIO_printf(Perl_debug_log, - "Matching stclass %.*s against %s (%d chars)\n", - (int)SvCUR(prop), SvPVX_const(prop), - quoted, (int)(strend - s)); - } - }); - if (find_byclass(prog, c, s, strend, ®info)) - goto got_it; - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Contradicts stclass... [regexec_flags]\n")); - } - else { - dontbother = 0; - if (prog->float_substr != NULL || prog->float_utf8 != NULL) { - /* Trim the end. */ - char *last; - SV* float_real; - - if (!(do_utf8 ? prog->float_utf8 : prog->float_substr)) - do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); - float_real = do_utf8 ? prog->float_utf8 : prog->float_substr; - - if (flags & REXEC_SCREAM) { - last = screaminstr(sv, float_real, s - strbeg, - end_shift, &scream_pos, 1); /* last one */ - if (!last) - last = scream_olds; /* Only one occurrence. */ - /* we may be pointing at the wrong string */ - else if (RXp_MATCH_COPIED(prog)) - s = strbeg + (s - SvPVX_const(sv)); - } - else { - STRLEN len; - const char * const little = SvPV_const(float_real, len); - - if (SvTAIL(float_real)) { - if (memEQ(strend - len + 1, little, len - 1)) - last = strend - len + 1; - else if (!multiline) - last = memEQ(strend - len, little, len) - ? strend - len : NULL; - else - goto find_last; - } else { - find_last: - if (len) - last = rninstr(s, strend, little, little + len); - else - last = strend; /* matching "$" */ - } - } - if (last == NULL) { - DEBUG_EXECUTE_r( - PerlIO_printf(Perl_debug_log, - "%sCan't trim the tail, match fails (should not happen)%s\n", - PL_colors[4], PL_colors[5])); - goto phooey; /* Should not happen! */ - } - dontbother = strend - last + prog->float_min_offset; - } - if (minlen && (dontbother < minlen)) - dontbother = minlen - 1; - strend -= dontbother; /* this one's always in bytes! */ - /* We don't know much -- general case. */ - if (do_utf8) { - for (;;) { - if (regtry(®info, &s)) - goto got_it; - if (s >= strend) - break; - s += UTF8SKIP(s); - }; - } - else { - do { - if (regtry(®info, &s)) - goto got_it; - } while (s++ < strend); - } - } - - /* Failure. */ - goto phooey; - -got_it: - Safefree(swap); - RX_MATCH_TAINTED_set(rx, PL_reg_flags & RF_tainted); - - if (PL_reg_eval_set) - restore_pos(aTHX_ prog); - if (RXp_PAREN_NAMES(prog)) - (void)hv_iterinit(RXp_PAREN_NAMES(prog)); - - /* make sure $`, $&, $', and $digit will work later */ - if ( !(flags & REXEC_NOT_FIRST) ) { - RX_MATCH_COPY_FREE(rx); - if (flags & REXEC_COPY_STR) { - const I32 i = PL_regeol - startpos + (stringarg - strbeg); -#ifdef PERL_OLD_COPY_ON_WRITE - if ((SvIsCOW(sv) - || (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS)) { - if (DEBUG_C_TEST) { - PerlIO_printf(Perl_debug_log, - "Copy on write: regexp capture, type %d\n", - (int) SvTYPE(sv)); - } - prog->saved_copy = sv_setsv_cow(prog->saved_copy, sv); - prog->subbeg = (char *)SvPVX_const(prog->saved_copy); - assert (SvPOKp(prog->saved_copy)); - } else -#endif - { - RX_MATCH_COPIED_on(rx); - s = savepvn(strbeg, i); - prog->subbeg = s; - } - prog->sublen = i; - } - else { - prog->subbeg = strbeg; - prog->sublen = PL_regeol - strbeg; /* strend may have been modified */ - } - } - - return 1; - -phooey: - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch failed%s\n", - PL_colors[4], PL_colors[5])); - if (PL_reg_eval_set) - restore_pos(aTHX_ prog); - if (swap) { - /* we failed :-( roll it back */ - Safefree(prog->offs); - prog->offs = swap; - } - - return 0; -} - - -/* - - regtry - try match at specific point - */ -STATIC I32 /* 0 failure, 1 success */ -S_regtry(pTHX_ regmatch_info *reginfo, char **startpos) -{ - dVAR; - CHECKPOINT lastcp; - REGEXP *const rx = reginfo->prog; - regexp *const prog = (struct regexp *)SvANY(rx); - RXi_GET_DECL(prog,progi); - GET_RE_DEBUG_FLAGS_DECL; - - PERL_ARGS_ASSERT_REGTRY; - - reginfo->cutpoint=NULL; - - if ((prog->extflags & RXf_EVAL_SEEN) && !PL_reg_eval_set) { - MAGIC *mg; - - PL_reg_eval_set = RS_init; - DEBUG_EXECUTE_r(DEBUG_s( - PerlIO_printf(Perl_debug_log, " setting stack tmpbase at %"IVdf"\n", - (IV)(PL_stack_sp - PL_stack_base)); - )); - SAVESTACK_CXPOS(); - cxstack[cxstack_ix].blk_oldsp = PL_stack_sp - PL_stack_base; - /* Otherwise OP_NEXTSTATE will free whatever on stack now. */ - SAVETMPS; - /* Apparently this is not needed, judging by wantarray. */ - /* SAVEI8(cxstack[cxstack_ix].blk_gimme); - cxstack[cxstack_ix].blk_gimme = G_SCALAR; */ - - if (reginfo->sv) { - /* Make $_ available to executed code. */ - if (reginfo->sv != DEFSV) { - SAVE_DEFSV; - DEFSV_set(reginfo->sv); - } - - if (!(SvTYPE(reginfo->sv) >= SVt_PVMG && SvMAGIC(reginfo->sv) - && (mg = mg_find(reginfo->sv, PERL_MAGIC_regex_global)))) { - /* prepare for quick setting of pos */ -#ifdef PERL_OLD_COPY_ON_WRITE - if (SvIsCOW(reginfo->sv)) - sv_force_normal_flags(reginfo->sv, 0); -#endif - mg = sv_magicext(reginfo->sv, NULL, PERL_MAGIC_regex_global, - &PL_vtbl_mglob, NULL, 0); - mg->mg_len = -1; - } - PL_reg_magic = mg; - PL_reg_oldpos = mg->mg_len; - SAVEDESTRUCTOR_X(restore_pos, prog); - } - if (!PL_reg_curpm) { - Newxz(PL_reg_curpm, 1, PMOP); -#ifdef USE_ITHREADS - { - SV* const repointer = &PL_sv_undef; - /* this regexp is also owned by the new PL_reg_curpm, which - will try to free it. */ - av_push(PL_regex_padav, repointer); - PL_reg_curpm->op_pmoffset = av_len(PL_regex_padav); - PL_regex_pad = AvARRAY(PL_regex_padav); - } -#endif - } -#ifdef USE_ITHREADS - /* It seems that non-ithreads works both with and without this code. - So for efficiency reasons it seems best not to have the code - compiled when it is not needed. */ - /* This is safe against NULLs: */ - ReREFCNT_dec(PM_GETRE(PL_reg_curpm)); - /* PM_reg_curpm owns a reference to this regexp. */ - ReREFCNT_inc(rx); -#endif - PM_SETRE(PL_reg_curpm, rx); - PL_reg_oldcurpm = PL_curpm; - PL_curpm = PL_reg_curpm; - if (RXp_MATCH_COPIED(prog)) { - /* Here is a serious problem: we cannot rewrite subbeg, - since it may be needed if this match fails. Thus - $` inside (?{}) could fail... */ - PL_reg_oldsaved = prog->subbeg; - PL_reg_oldsavedlen = prog->sublen; -#ifdef PERL_OLD_COPY_ON_WRITE - PL_nrs = prog->saved_copy; -#endif - RXp_MATCH_COPIED_off(prog); - } - else - PL_reg_oldsaved = NULL; - prog->subbeg = PL_bostr; - prog->sublen = PL_regeol - PL_bostr; /* strend may have been modified */ - } - DEBUG_EXECUTE_r(PL_reg_starttry = *startpos); - prog->offs[0].start = *startpos - PL_bostr; - PL_reginput = *startpos; - PL_reglastparen = &prog->lastparen; - PL_reglastcloseparen = &prog->lastcloseparen; - prog->lastparen = 0; - prog->lastcloseparen = 0; - PL_regsize = 0; - PL_regoffs = prog->offs; - if (PL_reg_start_tmpl <= prog->nparens) { - PL_reg_start_tmpl = prog->nparens*3/2 + 3; - if(PL_reg_start_tmp) - Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*); - else - Newx(PL_reg_start_tmp, PL_reg_start_tmpl, char*); - } - - /* XXXX What this code is doing here?!!! There should be no need - to do this again and again, PL_reglastparen should take care of - this! --ilya*/ - - /* Tests pat.t#187 and split.t#{13,14} seem to depend on this code. - * Actually, the code in regcppop() (which Ilya may be meaning by - * PL_reglastparen), is not needed at all by the test suite - * (op/regexp, op/pat, op/split), but that code is needed otherwise - * this erroneously leaves $1 defined: "1" =~ /^(?:(\d)x)?\d$/ - * Meanwhile, this code *is* needed for the - * above-mentioned test suite tests to succeed. The common theme - * on those tests seems to be returning null fields from matches. - * --jhi updated by dapm */ -#if 1 - if (prog->nparens) { - regexp_paren_pair *pp = PL_regoffs; - register I32 i; - for (i = prog->nparens; i > (I32)*PL_reglastparen; i--) { - ++pp; - pp->start = -1; - pp->end = -1; - } - } -#endif - REGCP_SET(lastcp); - if (regmatch(reginfo, progi->program + 1)) { - PL_regoffs[0].end = PL_reginput - PL_bostr; - return 1; - } - if (reginfo->cutpoint) - *startpos= reginfo->cutpoint; - REGCP_UNWIND(lastcp); - return 0; -} - - -#define sayYES goto yes -#define sayNO goto no -#define sayNO_SILENT goto no_silent - -/* we dont use STMT_START/END here because it leads to - "unreachable code" warnings, which are bogus, but distracting. */ -#define CACHEsayNO \ - if (ST.cache_mask) \ - PL_reg_poscache[ST.cache_offset] |= ST.cache_mask; \ - sayNO - -/* this is used to determine how far from the left messages like - 'failed...' are printed. It should be set such that messages - are inline with the regop output that created them. -*/ -#define REPORT_CODE_OFF 32 - - -/* Make sure there is a test for this +1 options in re_tests */ -#define TRIE_INITAL_ACCEPT_BUFFLEN 4; - -#define CHRTEST_UNINIT -1001 /* c1/c2 haven't been calculated yet */ -#define CHRTEST_VOID -1000 /* the c1/c2 "next char" test should be skipped */ - -#define SLAB_FIRST(s) (&(s)->states[0]) -#define SLAB_LAST(s) (&(s)->states[PERL_REGMATCH_SLAB_SLOTS-1]) - -/* grab a new slab and return the first slot in it */ - -STATIC regmatch_state * -S_push_slab(pTHX) -{ -#if PERL_VERSION < 9 && !defined(PERL_CORE) - dMY_CXT; -#endif - regmatch_slab *s = PL_regmatch_slab->next; - if (!s) { - Newx(s, 1, regmatch_slab); - s->prev = PL_regmatch_slab; - s->next = NULL; - PL_regmatch_slab->next = s; - } - PL_regmatch_slab = s; - return SLAB_FIRST(s); -} - - -/* push a new state then goto it */ - -#define PUSH_STATE_GOTO(state, node) \ - scan = node; \ - st->resume_state = state; \ - goto push_state; - -/* push a new state with success backtracking, then goto it */ - -#define PUSH_YES_STATE_GOTO(state, node) \ - scan = node; \ - st->resume_state = state; \ - goto push_yes_state; - - - -/* - -regmatch() - main matching routine - -This is basically one big switch statement in a loop. We execute an op, -set 'next' to point the next op, and continue. If we come to a point which -we may need to backtrack to on failure such as (A|B|C), we push a -backtrack state onto the backtrack stack. On failure, we pop the top -state, and re-enter the loop at the state indicated. If there are no more -states to pop, we return failure. - -Sometimes we also need to backtrack on success; for example /A+/, where -after successfully matching one A, we need to go back and try to -match another one; similarly for lookahead assertions: if the assertion -completes successfully, we backtrack to the state just before the assertion -and then carry on. In these cases, the pushed state is marked as -'backtrack on success too'. This marking is in fact done by a chain of -pointers, each pointing to the previous 'yes' state. On success, we pop to -the nearest yes state, discarding any intermediate failure-only states. -Sometimes a yes state is pushed just to force some cleanup code to be -called at the end of a successful match or submatch; e.g. (??{$re}) uses -it to free the inner regex. - -Note that failure backtracking rewinds the cursor position, while -success backtracking leaves it alone. - -A pattern is complete when the END op is executed, while a subpattern -such as (?=foo) is complete when the SUCCESS op is executed. Both of these -ops trigger the "pop to last yes state if any, otherwise return true" -behaviour. - -A common convention in this function is to use A and B to refer to the two -subpatterns (or to the first nodes thereof) in patterns like /A*B/: so A is -the subpattern to be matched possibly multiple times, while B is the entire -rest of the pattern. Variable and state names reflect this convention. - -The states in the main switch are the union of ops and failure/success of -substates associated with with that op. For example, IFMATCH is the op -that does lookahead assertions /(?=A)B/ and so the IFMATCH state means -'execute IFMATCH'; while IFMATCH_A is a state saying that we have just -successfully matched A and IFMATCH_A_fail is a state saying that we have -just failed to match A. Resume states always come in pairs. The backtrack -state we push is marked as 'IFMATCH_A', but when that is popped, we resume -at IFMATCH_A or IFMATCH_A_fail, depending on whether we are backtracking -on success or failure. - -The struct that holds a backtracking state is actually a big union, with -one variant for each major type of op. The variable st points to the -top-most backtrack struct. To make the code clearer, within each -block of code we #define ST to alias the relevant union. - -Here's a concrete example of a (vastly oversimplified) IFMATCH -implementation: - - switch (state) { - .... - -#define ST st->u.ifmatch - - case IFMATCH: // we are executing the IFMATCH op, (?=A)B - ST.foo = ...; // some state we wish to save - ... - // push a yes backtrack state with a resume value of - // IFMATCH_A/IFMATCH_A_fail, then continue execution at the - // first node of A: - PUSH_YES_STATE_GOTO(IFMATCH_A, A); - // NOTREACHED - - case IFMATCH_A: // we have successfully executed A; now continue with B - next = B; - bar = ST.foo; // do something with the preserved value - break; - - case IFMATCH_A_fail: // A failed, so the assertion failed - ...; // do some housekeeping, then ... - sayNO; // propagate the failure - -#undef ST - - ... - } - -For any old-timers reading this who are familiar with the old recursive -approach, the code above is equivalent to: - - case IFMATCH: // we are executing the IFMATCH op, (?=A)B - { - int foo = ... - ... - if (regmatch(A)) { - next = B; - bar = foo; - break; - } - ...; // do some housekeeping, then ... - sayNO; // propagate the failure - } - -The topmost backtrack state, pointed to by st, is usually free. If you -want to claim it, populate any ST.foo fields in it with values you wish to -save, then do one of - - PUSH_STATE_GOTO(resume_state, node); - PUSH_YES_STATE_GOTO(resume_state, node); - -which sets that backtrack state's resume value to 'resume_state', pushes a -new free entry to the top of the backtrack stack, then goes to 'node'. -On backtracking, the free slot is popped, and the saved state becomes the -new free state. An ST.foo field in this new top state can be temporarily -accessed to retrieve values, but once the main loop is re-entered, it -becomes available for reuse. - -Note that the depth of the backtrack stack constantly increases during the -left-to-right execution of the pattern, rather than going up and down with -the pattern nesting. For example the stack is at its maximum at Z at the -end of the pattern, rather than at X in the following: - - /(((X)+)+)+....(Y)+....Z/ - -The only exceptions to this are lookahead/behind assertions and the cut, -(?>A), which pop all the backtrack states associated with A before -continuing. - -Bascktrack state structs are allocated in slabs of about 4K in size. -PL_regmatch_state and st always point to the currently active state, -and PL_regmatch_slab points to the slab currently containing -PL_regmatch_state. The first time regmatch() is called, the first slab is -allocated, and is never freed until interpreter destruction. When the slab -is full, a new one is allocated and chained to the end. At exit from -regmatch(), slabs allocated since entry are freed. - -*/ - - -#define DEBUG_STATE_pp(pp) \ - DEBUG_STATE_r({ \ - DUMP_EXEC_POS(locinput, scan, do_utf8); \ - PerlIO_printf(Perl_debug_log, \ - " %*s"pp" %s%s%s%s%s\n", \ - depth*2, "", \ - PL_reg_name[st->resume_state], \ - ((st==yes_state||st==mark_state) ? "[" : ""), \ - ((st==yes_state) ? "Y" : ""), \ - ((st==mark_state) ? "M" : ""), \ - ((st==yes_state||st==mark_state) ? "]" : "") \ - ); \ - }); - - -#define REG_NODE_NUM(x) ((x) ? (int)((x)-prog) : -1) - -#ifdef DEBUGGING - -STATIC void -S_debug_start_match(pTHX_ const REGEXP *prog, const bool do_utf8, - const char *start, const char *end, const char *blurb) -{ - const bool utf8_pat = RX_UTF8(prog) ? 1 : 0; - - PERL_ARGS_ASSERT_DEBUG_START_MATCH; - - if (!PL_colorset) - reginitcolors(); - { - RE_PV_QUOTED_DECL(s0, utf8_pat, PERL_DEBUG_PAD_ZERO(0), - RX_PRECOMP_const(prog), RX_PRELEN(prog), 60); - - RE_PV_QUOTED_DECL(s1, do_utf8, PERL_DEBUG_PAD_ZERO(1), - start, end - start, 60); - - PerlIO_printf(Perl_debug_log, - "%s%s REx%s %s against %s\n", - PL_colors[4], blurb, PL_colors[5], s0, s1); - - if (do_utf8||utf8_pat) - PerlIO_printf(Perl_debug_log, "UTF-8 %s%s%s...\n", - utf8_pat ? "pattern" : "", - utf8_pat && do_utf8 ? " and " : "", - do_utf8 ? "string" : "" - ); - } -} - -STATIC void -S_dump_exec_pos(pTHX_ const char *locinput, - const regnode *scan, - const char *loc_regeol, - const char *loc_bostr, - const char *loc_reg_starttry, - const bool do_utf8) -{ - const int docolor = *PL_colors[0] || *PL_colors[2] || *PL_colors[4]; - const int taill = (docolor ? 10 : 7); /* 3 chars for "> <" */ - int l = (loc_regeol - locinput) > taill ? taill : (loc_regeol - locinput); - /* The part of the string before starttry has one color - (pref0_len chars), between starttry and current - position another one (pref_len - pref0_len chars), - after the current position the third one. - We assume that pref0_len <= pref_len, otherwise we - decrease pref0_len. */ - int pref_len = (locinput - loc_bostr) > (5 + taill) - l - ? (5 + taill) - l : locinput - loc_bostr; - int pref0_len; - - PERL_ARGS_ASSERT_DUMP_EXEC_POS; - - while (do_utf8 && UTF8_IS_CONTINUATION(*(U8*)(locinput - pref_len))) - pref_len++; - pref0_len = pref_len - (locinput - loc_reg_starttry); - if (l + pref_len < (5 + taill) && l < loc_regeol - locinput) - l = ( loc_regeol - locinput > (5 + taill) - pref_len - ? (5 + taill) - pref_len : loc_regeol - locinput); - while (do_utf8 && UTF8_IS_CONTINUATION(*(U8*)(locinput + l))) - l--; - if (pref0_len < 0) - pref0_len = 0; - if (pref0_len > pref_len) - pref0_len = pref_len; - { - const int is_uni = (do_utf8 && OP(scan) != CANY) ? 1 : 0; - - RE_PV_COLOR_DECL(s0,len0,is_uni,PERL_DEBUG_PAD(0), - (locinput - pref_len),pref0_len, 60, 4, 5); - - RE_PV_COLOR_DECL(s1,len1,is_uni,PERL_DEBUG_PAD(1), - (locinput - pref_len + pref0_len), - pref_len - pref0_len, 60, 2, 3); - - RE_PV_COLOR_DECL(s2,len2,is_uni,PERL_DEBUG_PAD(2), - locinput, loc_regeol - locinput, 10, 0, 1); - - const STRLEN tlen=len0+len1+len2; - PerlIO_printf(Perl_debug_log, - "%4"IVdf" <%.*s%.*s%s%.*s>%*s|", - (IV)(locinput - loc_bostr), - len0, s0, - len1, s1, - (docolor ? "" : "> <"), - len2, s2, - (int)(tlen > 19 ? 0 : 19 - tlen), - ""); - } -} - -#endif - -/* reg_check_named_buff_matched() - * Checks to see if a named buffer has matched. The data array of - * buffer numbers corresponding to the buffer is expected to reside - * in the regexp->data->data array in the slot stored in the ARG() of - * node involved. Note that this routine doesn't actually care about the - * name, that information is not preserved from compilation to execution. - * Returns the index of the leftmost defined buffer with the given name - * or 0 if non of the buffers matched. - */ -STATIC I32 -S_reg_check_named_buff_matched(pTHX_ const regexp *rex, const regnode *scan) -{ - I32 n; - RXi_GET_DECL(rex,rexi); - SV *sv_dat= MUTABLE_SV(rexi->data->data[ ARG( scan ) ]); - I32 *nums=(I32*)SvPVX(sv_dat); - - PERL_ARGS_ASSERT_REG_CHECK_NAMED_BUFF_MATCHED; - - for ( n=0; n= nums[n] && - PL_regoffs[nums[n]].end != -1) - { - return nums[n]; - } - } - return 0; -} - - -/* free all slabs above current one - called during LEAVE_SCOPE */ - -STATIC void -S_clear_backtrack_stack(pTHX_ void *p) -{ - regmatch_slab *s = PL_regmatch_slab->next; - PERL_UNUSED_ARG(p); - - if (!s) - return; - PL_regmatch_slab->next = NULL; - while (s) { - regmatch_slab * const osl = s; - s = s->next; - Safefree(osl); - } -} - - -#define SETREX(Re1,Re2) \ - if (PL_reg_eval_set) PM_SETRE((PL_reg_curpm), (Re2)); \ - Re1 = (Re2) - -STATIC I32 /* 0 failure, 1 success */ -S_regmatch(pTHX_ regmatch_info *reginfo, regnode *prog) -{ -#if PERL_VERSION < 9 && !defined(PERL_CORE) - dMY_CXT; -#endif - dVAR; - register const bool do_utf8 = PL_reg_match_utf8; - const U32 uniflags = UTF8_ALLOW_DEFAULT; - REGEXP *rex_sv = reginfo->prog; - regexp *rex = (struct regexp *)SvANY(rex_sv); - RXi_GET_DECL(rex,rexi); - I32 oldsave; - /* the current state. This is a cached copy of PL_regmatch_state */ - register regmatch_state *st; - /* cache heavy used fields of st in registers */ - register regnode *scan; - register regnode *next; - register U32 n = 0; /* general value; init to avoid compiler warning */ - register I32 ln = 0; /* len or last; init to avoid compiler warning */ - register char *locinput = PL_reginput; - register I32 nextchr; /* is always set to UCHARAT(locinput) */ - - bool result = 0; /* return value of S_regmatch */ - int depth = 0; /* depth of backtrack stack */ - U32 nochange_depth = 0; /* depth of GOSUB recursion with nochange */ - const U32 max_nochange_depth = - (3 * rex->nparens > MAX_RECURSE_EVAL_NOCHANGE_DEPTH) ? - 3 * rex->nparens : MAX_RECURSE_EVAL_NOCHANGE_DEPTH; - regmatch_state *yes_state = NULL; /* state to pop to on success of - subpattern */ - /* mark_state piggy backs on the yes_state logic so that when we unwind - the stack on success we can update the mark_state as we go */ - regmatch_state *mark_state = NULL; /* last mark state we have seen */ - regmatch_state *cur_eval = NULL; /* most recent EVAL_AB state */ - struct regmatch_state *cur_curlyx = NULL; /* most recent curlyx */ - U32 state_num; - bool no_final = 0; /* prevent failure from backtracking? */ - bool do_cutgroup = 0; /* no_final only until next branch/trie entry */ - char *startpoint = PL_reginput; - SV *popmark = NULL; /* are we looking for a mark? */ - SV *sv_commit = NULL; /* last mark name seen in failure */ - SV *sv_yes_mark = NULL; /* last mark name we have seen - during a successfull match */ - U32 lastopen = 0; /* last open we saw */ - bool has_cutgroup = RX_HAS_CUTGROUP(rex) ? 1 : 0; - SV* const oreplsv = GvSV(PL_replgv); - /* these three flags are set by various ops to signal information to - * the very next op. They have a useful lifetime of exactly one loop - * iteration, and are not preserved or restored by state pushes/pops - */ - bool sw = 0; /* the condition value in (?(cond)a|b) */ - bool minmod = 0; /* the next "{n,m}" is a "{n,m}?" */ - int logical = 0; /* the following EVAL is: - 0: (?{...}) - 1: (?(?{...})X|Y) - 2: (??{...}) - or the following IFMATCH/UNLESSM is: - false: plain (?=foo) - true: used as a condition: (?(?=foo)) - */ -#ifdef DEBUGGING - GET_RE_DEBUG_FLAGS_DECL; -#endif - - PERL_ARGS_ASSERT_REGMATCH; - - DEBUG_OPTIMISE_r( DEBUG_EXECUTE_r({ - PerlIO_printf(Perl_debug_log,"regmatch start\n"); - })); - /* on first ever call to regmatch, allocate first slab */ - if (!PL_regmatch_slab) { - Newx(PL_regmatch_slab, 1, regmatch_slab); - PL_regmatch_slab->prev = NULL; - PL_regmatch_slab->next = NULL; - PL_regmatch_state = SLAB_FIRST(PL_regmatch_slab); - } - - oldsave = PL_savestack_ix; - SAVEDESTRUCTOR_X(S_clear_backtrack_stack, NULL); - SAVEVPTR(PL_regmatch_slab); - SAVEVPTR(PL_regmatch_state); - - /* grab next free state slot */ - st = ++PL_regmatch_state; - if (st > SLAB_LAST(PL_regmatch_slab)) - st = PL_regmatch_state = S_push_slab(aTHX); - - /* Note that nextchr is a byte even in UTF */ - nextchr = UCHARAT(locinput); - scan = prog; - while (scan != NULL) { - - DEBUG_EXECUTE_r( { - SV * const prop = sv_newmortal(); - regnode *rnext=regnext(scan); - DUMP_EXEC_POS( locinput, scan, do_utf8 ); - regprop(rex, prop, scan); - - PerlIO_printf(Perl_debug_log, - "%3"IVdf":%*s%s(%"IVdf")\n", - (IV)(scan - rexi->program), depth*2, "", - SvPVX_const(prop), - (PL_regkind[OP(scan)] == END || !rnext) ? - 0 : (IV)(rnext - rexi->program)); - }); - - next = scan + NEXT_OFF(scan); - if (next == scan) - next = NULL; - state_num = OP(scan); - - REH_CALL_EXEC_NODE_HOOK(rex, scan, reginfo, st); - reenter_switch: - - assert(PL_reglastparen == &rex->lastparen); - assert(PL_reglastcloseparen == &rex->lastcloseparen); - assert(PL_regoffs == rex->offs); - - switch (state_num) { - case BOL: - if (locinput == PL_bostr) - { - /* reginfo->till = reginfo->bol; */ - break; - } - sayNO; - case MBOL: - if (locinput == PL_bostr || - ((nextchr || locinput < PL_regeol) && locinput[-1] == '\n')) - { - break; - } - sayNO; - case SBOL: - if (locinput == PL_bostr) - break; - sayNO; - case GPOS: - if (locinput == reginfo->ganch) - break; - sayNO; - - case KEEPS: - /* update the startpoint */ - st->u.keeper.val = PL_regoffs[0].start; - PL_reginput = locinput; - PL_regoffs[0].start = locinput - PL_bostr; - PUSH_STATE_GOTO(KEEPS_next, next); - /*NOT-REACHED*/ - case KEEPS_next_fail: - /* rollback the start point change */ - PL_regoffs[0].start = st->u.keeper.val; - sayNO_SILENT; - /*NOT-REACHED*/ - case EOL: - goto seol; - case MEOL: - if ((nextchr || locinput < PL_regeol) && nextchr != '\n') - sayNO; - break; - case SEOL: - seol: - if ((nextchr || locinput < PL_regeol) && nextchr != '\n') - sayNO; - if (PL_regeol - locinput > 1) - sayNO; - break; - case EOS: - if (PL_regeol != locinput) - sayNO; - break; - case SANY: - if (!nextchr && locinput >= PL_regeol) - sayNO; - if (do_utf8) { - locinput += PL_utf8skip[nextchr]; - if (locinput > PL_regeol) - sayNO; - nextchr = UCHARAT(locinput); - } - else - nextchr = UCHARAT(++locinput); - break; - case CANY: - if (!nextchr && locinput >= PL_regeol) - sayNO; - nextchr = UCHARAT(++locinput); - break; - case REG_ANY: - if ((!nextchr && locinput >= PL_regeol) || nextchr == '\n') - sayNO; - if (do_utf8) { - locinput += PL_utf8skip[nextchr]; - if (locinput > PL_regeol) - sayNO; - nextchr = UCHARAT(locinput); - } - else - nextchr = UCHARAT(++locinput); - break; - -#undef ST -#define ST st->u.trie - case TRIEC: - /* In this case the charclass data is available inline so - we can fail fast without a lot of extra overhead. - */ - if (scan->flags == EXACT || !do_utf8) { - if(!ANYOF_BITMAP_TEST(scan, *locinput)) { - DEBUG_EXECUTE_r( - PerlIO_printf(Perl_debug_log, - "%*s %sfailed to match trie start class...%s\n", - REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5]) - ); - sayNO_SILENT; - /* NOTREACHED */ - } - } - /* FALL THROUGH */ - case TRIE: - { - /* what type of TRIE am I? (utf8 makes this contextual) */ - DECL_TRIE_TYPE(scan); - - /* what trie are we using right now */ - reg_trie_data * const trie - = (reg_trie_data*)rexi->data->data[ ARG( scan ) ]; - HV * widecharmap = MUTABLE_HV(rexi->data->data[ ARG( scan ) + 1 ]); - U32 state = trie->startstate; - - if (trie->bitmap && trie_type != trie_utf8_fold && - !TRIE_BITMAP_TEST(trie,*locinput) - ) { - if (trie->states[ state ].wordnum) { - DEBUG_EXECUTE_r( - PerlIO_printf(Perl_debug_log, - "%*s %smatched empty string...%s\n", - REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5]) - ); - break; - } else { - DEBUG_EXECUTE_r( - PerlIO_printf(Perl_debug_log, - "%*s %sfailed to match trie start class...%s\n", - REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5]) - ); - sayNO_SILENT; - } - } - - { - U8 *uc = ( U8* )locinput; - - STRLEN len = 0; - STRLEN foldlen = 0; - U8 *uscan = (U8*)NULL; - STRLEN bufflen=0; - SV *sv_accept_buff = NULL; - U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ]; - - ST.accepted = 0; /* how many accepting states we have seen */ - ST.B = next; - ST.jump = trie->jump; - ST.me = scan; - /* - traverse the TRIE keeping track of all accepting states - we transition through until we get to a failing node. - */ - - while ( state && uc <= (U8*)PL_regeol ) { - U32 base = trie->states[ state ].trans.base; - UV uvc = 0; - U16 charid; - /* We use charid to hold the wordnum as we don't use it - for charid until after we have done the wordnum logic. - We define an alias just so that the wordnum logic reads - more naturally. */ - -#define got_wordnum charid - got_wordnum = trie->states[ state ].wordnum; - - if ( got_wordnum ) { - if ( ! ST.accepted ) { - ENTER; - SAVETMPS; /* XXX is this necessary? dmq */ - bufflen = TRIE_INITAL_ACCEPT_BUFFLEN; - sv_accept_buff=newSV(bufflen * - sizeof(reg_trie_accepted) - 1); - SvCUR_set(sv_accept_buff, 0); - SvPOK_on(sv_accept_buff); - sv_2mortal(sv_accept_buff); - SAVETMPS; - ST.accept_buff = - (reg_trie_accepted*)SvPV_nolen(sv_accept_buff ); - } - do { - if (ST.accepted >= bufflen) { - bufflen *= 2; - ST.accept_buff =(reg_trie_accepted*) - SvGROW(sv_accept_buff, - bufflen * sizeof(reg_trie_accepted)); - } - SvCUR_set(sv_accept_buff,SvCUR(sv_accept_buff) - + sizeof(reg_trie_accepted)); - - - ST.accept_buff[ST.accepted].wordnum = got_wordnum; - ST.accept_buff[ST.accepted].endpos = uc; - ++ST.accepted; - } while (trie->nextword && (got_wordnum= trie->nextword[got_wordnum])); - } -#undef got_wordnum - - DEBUG_TRIE_EXECUTE_r({ - DUMP_EXEC_POS( (char *)uc, scan, do_utf8 ); - PerlIO_printf( Perl_debug_log, - "%*s %sState: %4"UVxf" Accepted: %4"UVxf" ", - 2+depth * 2, "", PL_colors[4], - (UV)state, (UV)ST.accepted ); - }); - - if ( base ) { - REXEC_TRIE_READ_CHAR(trie_type, trie, widecharmap, uc, - uscan, len, uvc, charid, foldlen, - foldbuf, uniflags); - - if (charid && - (base + charid > trie->uniquecharcount ) - && (base + charid - 1 - trie->uniquecharcount - < trie->lasttrans) - && trie->trans[base + charid - 1 - - trie->uniquecharcount].check == state) - { - state = trie->trans[base + charid - 1 - - trie->uniquecharcount ].next; - } - else { - state = 0; - } - uc += len; - - } - else { - state = 0; - } - DEBUG_TRIE_EXECUTE_r( - PerlIO_printf( Perl_debug_log, - "Charid:%3x CP:%4"UVxf" After State: %4"UVxf"%s\n", - charid, uvc, (UV)state, PL_colors[5] ); - ); - } - if (!ST.accepted ) - sayNO; - - DEBUG_EXECUTE_r( - PerlIO_printf( Perl_debug_log, - "%*s %sgot %"IVdf" possible matches%s\n", - REPORT_CODE_OFF + depth * 2, "", - PL_colors[4], (IV)ST.accepted, PL_colors[5] ); - ); - }} - goto trie_first_try; /* jump into the fail handler */ - /* NOTREACHED */ - case TRIE_next_fail: /* we failed - try next alterative */ - if ( ST.jump) { - REGCP_UNWIND(ST.cp); - for (n = *PL_reglastparen; n > ST.lastparen; n--) - PL_regoffs[n].end = -1; - *PL_reglastparen = n; - } - trie_first_try: - if (do_cutgroup) { - do_cutgroup = 0; - no_final = 0; - } - - if ( ST.jump) { - ST.lastparen = *PL_reglastparen; - REGCP_SET(ST.cp); - } - if ( ST.accepted == 1 ) { - /* only one choice left - just continue */ - DEBUG_EXECUTE_r({ - AV *const trie_words - = MUTABLE_AV(rexi->data->data[ARG(ST.me)+TRIE_WORDS_OFFSET]); - SV ** const tmp = av_fetch( trie_words, - ST.accept_buff[ 0 ].wordnum-1, 0 ); - SV *sv= tmp ? sv_newmortal() : NULL; - - PerlIO_printf( Perl_debug_log, - "%*s %sonly one match left: #%d <%s>%s\n", - REPORT_CODE_OFF+depth*2, "", PL_colors[4], - ST.accept_buff[ 0 ].wordnum, - tmp ? pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), 0, - PL_colors[0], PL_colors[1], - (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) - ) - : "not compiled under -Dr", - PL_colors[5] ); - }); - PL_reginput = (char *)ST.accept_buff[ 0 ].endpos; - /* in this case we free tmps/leave before we call regmatch - as we wont be using accept_buff again. */ - - locinput = PL_reginput; - nextchr = UCHARAT(locinput); - if ( !ST.jump || !ST.jump[ST.accept_buff[0].wordnum]) - scan = ST.B; - else - scan = ST.me + ST.jump[ST.accept_buff[0].wordnum]; - if (!has_cutgroup) { - FREETMPS; - LEAVE; - } else { - ST.accepted--; - PUSH_YES_STATE_GOTO(TRIE_next, scan); - } - - continue; /* execute rest of RE */ - } - - if ( !ST.accepted-- ) { - DEBUG_EXECUTE_r({ - PerlIO_printf( Perl_debug_log, - "%*s %sTRIE failed...%s\n", - REPORT_CODE_OFF+depth*2, "", - PL_colors[4], - PL_colors[5] ); - }); - FREETMPS; - LEAVE; - sayNO_SILENT; - /*NOTREACHED*/ - } - - /* - There are at least two accepting states left. Presumably - the number of accepting states is going to be low, - typically two. So we simply scan through to find the one - with lowest wordnum. Once we find it, we swap the last - state into its place and decrement the size. We then try to - match the rest of the pattern at the point where the word - ends. If we succeed, control just continues along the - regex; if we fail we return here to try the next accepting - state - */ - - { - U32 best = 0; - U32 cur; - for( cur = 1 ; cur <= ST.accepted ; cur++ ) { - DEBUG_TRIE_EXECUTE_r( - PerlIO_printf( Perl_debug_log, - "%*s %sgot %"IVdf" (%d) as best, looking at %"IVdf" (%d)%s\n", - REPORT_CODE_OFF + depth * 2, "", PL_colors[4], - (IV)best, ST.accept_buff[ best ].wordnum, (IV)cur, - ST.accept_buff[ cur ].wordnum, PL_colors[5] ); - ); - - if (ST.accept_buff[cur].wordnum < - ST.accept_buff[best].wordnum) - best = cur; - } - - DEBUG_EXECUTE_r({ - AV *const trie_words - = MUTABLE_AV(rexi->data->data[ARG(ST.me)+TRIE_WORDS_OFFSET]); - SV ** const tmp = av_fetch( trie_words, - ST.accept_buff[ best ].wordnum - 1, 0 ); - regnode *nextop=(!ST.jump || !ST.jump[ST.accept_buff[best].wordnum]) ? - ST.B : - ST.me + ST.jump[ST.accept_buff[best].wordnum]; - SV *sv= tmp ? sv_newmortal() : NULL; - - PerlIO_printf( Perl_debug_log, - "%*s %strying alternation #%d <%s> at node #%d %s\n", - REPORT_CODE_OFF+depth*2, "", PL_colors[4], - ST.accept_buff[best].wordnum, - tmp ? pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), 0, - PL_colors[0], PL_colors[1], - (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) - ) : "not compiled under -Dr", - REG_NODE_NUM(nextop), - PL_colors[5] ); - }); - - if ( best= PL_regeol) - sayNO; - if (NATIVE_TO_UNI(*(U8*)s) != - utf8n_to_uvuni((U8*)l, UTF8_MAXBYTES, &ulen, - uniflags)) - sayNO; - l += ulen; - s ++; - } - } - else { - /* The target is not utf8, the pattern is utf8. */ - while (s < e) { - STRLEN ulen; - if (l >= PL_regeol) - sayNO; - if (NATIVE_TO_UNI(*((U8*)l)) != - utf8n_to_uvuni((U8*)s, UTF8_MAXBYTES, &ulen, - uniflags)) - sayNO; - s += ulen; - l ++; - } - } - locinput = l; - nextchr = UCHARAT(locinput); - break; - } - /* The target and the pattern have the same utf8ness. */ - /* Inline the first character, for speed. */ - if (UCHARAT(s) != nextchr) - sayNO; - if (PL_regeol - locinput < ln) - sayNO; - if (ln > 1 && memNE(s, locinput, ln)) - sayNO; - locinput += ln; - nextchr = UCHARAT(locinput); - break; - } - case EXACTFL: - PL_reg_flags |= RF_tainted; - /* FALL THROUGH */ - case EXACTF: { - char * const s = STRING(scan); - ln = STR_LEN(scan); - - if (do_utf8 || UTF) { - /* Either target or the pattern are utf8. */ - const char * const l = locinput; - char *e = PL_regeol; - - if (ibcmp_utf8(s, 0, ln, (bool)UTF, - l, &e, 0, do_utf8)) { - /* One more case for the sharp s: - * pack("U0U*", 0xDF) =~ /ss/i, - * the 0xC3 0x9F are the UTF-8 - * byte sequence for the U+00DF. */ - - if (!(do_utf8 && - toLOWER(s[0]) == 's' && - ln >= 2 && - toLOWER(s[1]) == 's' && - (U8)l[0] == 0xC3 && - e - l >= 2 && - (U8)l[1] == 0x9F)) - sayNO; - } - locinput = e; - nextchr = UCHARAT(locinput); - break; - } - - /* Neither the target and the pattern are utf8. */ - - /* Inline the first character, for speed. */ - if (UCHARAT(s) != nextchr && - UCHARAT(s) != ((OP(scan) == EXACTF) - ? PL_fold : PL_fold_locale)[nextchr]) - sayNO; - if (PL_regeol - locinput < ln) - sayNO; - if (ln > 1 && (OP(scan) == EXACTF - ? ibcmp(s, locinput, ln) - : ibcmp_locale(s, locinput, ln))) - sayNO; - locinput += ln; - nextchr = UCHARAT(locinput); - break; - } - case BOUNDL: - case NBOUNDL: - PL_reg_flags |= RF_tainted; - /* FALL THROUGH */ - case BOUND: - case NBOUND: - /* was last char in word? */ - if (do_utf8) { - if (locinput == PL_bostr) - ln = '\n'; - else { - const U8 * const r = reghop3((U8*)locinput, -1, (U8*)PL_bostr); - - ln = utf8n_to_uvchr(r, UTF8SKIP(r), 0, uniflags); - } - if (OP(scan) == BOUND || OP(scan) == NBOUND) { - ln = isALNUM_uni(ln); - LOAD_UTF8_CHARCLASS_ALNUM(); - n = swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8); - } - else { - ln = isALNUM_LC_uvchr(UNI_TO_NATIVE(ln)); - n = isALNUM_LC_utf8((U8*)locinput); - } - } - else { - ln = (locinput != PL_bostr) ? - UCHARAT(locinput - 1) : '\n'; - if (OP(scan) == BOUND || OP(scan) == NBOUND) { - ln = isALNUM(ln); - n = isALNUM(nextchr); - } - else { - ln = isALNUM_LC(ln); - n = isALNUM_LC(nextchr); - } - } - if (((!ln) == (!n)) == (OP(scan) == BOUND || - OP(scan) == BOUNDL)) - sayNO; - break; - case ANYOF: - if (do_utf8) { - STRLEN inclasslen = PL_regeol - locinput; - - if (!reginclass(rex, scan, (U8*)locinput, &inclasslen, do_utf8)) - goto anyof_fail; - if (locinput >= PL_regeol) - sayNO; - locinput += inclasslen ? inclasslen : UTF8SKIP(locinput); - nextchr = UCHARAT(locinput); - break; - } - else { - if (nextchr < 0) - nextchr = UCHARAT(locinput); - if (!REGINCLASS(rex, scan, (U8*)locinput)) - goto anyof_fail; - if (!nextchr && locinput >= PL_regeol) - sayNO; - nextchr = UCHARAT(++locinput); - break; - } - anyof_fail: - /* If we might have the case of the German sharp s - * in a casefolding Unicode character class. */ - - if (ANYOF_FOLD_SHARP_S(scan, locinput, PL_regeol)) { - locinput += SHARP_S_SKIP; - nextchr = UCHARAT(locinput); - } - else - sayNO; - break; - /* Special char classes - The defines start on line 129 or so */ - CCC_TRY_AFF( ALNUM, ALNUML, perl_word, "a", isALNUM_LC_utf8, isALNUM, isALNUM_LC); - CCC_TRY_NEG(NALNUM, NALNUML, perl_word, "a", isALNUM_LC_utf8, isALNUM, isALNUM_LC); - - CCC_TRY_AFF( SPACE, SPACEL, perl_space, " ", isSPACE_LC_utf8, isSPACE, isSPACE_LC); - CCC_TRY_NEG(NSPACE, NSPACEL, perl_space, " ", isSPACE_LC_utf8, isSPACE, isSPACE_LC); - - CCC_TRY_AFF( DIGIT, DIGITL, posix_digit, "0", isDIGIT_LC_utf8, isDIGIT, isDIGIT_LC); - CCC_TRY_NEG(NDIGIT, NDIGITL, posix_digit, "0", isDIGIT_LC_utf8, isDIGIT, isDIGIT_LC); - - case CLUMP: /* Match \X: logical Unicode character. This is defined as - a Unicode extended Grapheme Cluster */ - /* From http://www.unicode.org/reports/tr29 (5.2 version). An - extended Grapheme Cluster is: - - CR LF - | Prepend* Begin Extend* - | . - - Begin is (Hangul-syllable | ! Control) - Extend is (Grapheme_Extend | Spacing_Mark) - Control is [ GCB_Control CR LF ] - - The discussion below shows how the code for CLUMP is derived - from this regex. Note that most of these concepts are from - property values of the Grapheme Cluster Boundary (GCB) property. - No code point can have multiple property values for a given - property. Thus a code point in Prepend can't be in Control, but - it must be in !Control. This is why Control above includes - GCB_Control plus CR plus LF. The latter two are used in the GCB - property separately, and so can't be in GCB_Control, even though - they logically are controls. Control is not the same as gc=cc, - but includes format and other characters as well. - - The Unicode definition of Hangul-syllable is: - L+ - | (L* ( ( V | LV ) V* | LVT ) T*) - | T+ - ) - Each of these is a value for the GCB property, and hence must be - disjoint, so the order they are tested is immaterial, so the - above can safely be changed to - T+ - | L+ - | (L* ( LVT | ( V | LV ) V*) T*) - - The last two terms can be combined like this: - L* ( L - | (( LVT | ( V | LV ) V*) T*)) - - And refactored into this: - L* (L | LVT T* | V V* T* | LV V* T*) - - That means that if we have seen any L's at all we can quit - there, but if the next character is a LVT, a V or and LV we - should keep going. - - There is a subtlety with Prepend* which showed up in testing. - Note that the Begin, and only the Begin is required in: - | Prepend* Begin Extend* - Also, Begin contains '! Control'. A Prepend must be a '! - Control', which means it must be a Begin. What it comes down to - is that if we match Prepend* and then find no suitable Begin - afterwards, that if we backtrack the last Prepend, that one will - be a suitable Begin. - */ - - if (locinput >= PL_regeol) - sayNO; - if (! do_utf8) { - - /* Match either CR LF or '.', as all the other possibilities - * require utf8 */ - locinput++; /* Match the . or CR */ - if (nextchr == '\r' - && locinput < PL_regeol - && UCHARAT(locinput) == '\n') locinput++; - } - else { - - /* Utf8: See if is ( CR LF ); already know that locinput < - * PL_regeol, so locinput+1 is in bounds */ - if (nextchr == '\r' && UCHARAT(locinput + 1) == '\n') { - locinput += 2; - } - else { - /* In case have to backtrack to beginning, then match '.' */ - char *starting = locinput; - - /* In case have to backtrack the last prepend */ - char *previous_prepend = 0; - - LOAD_UTF8_CHARCLASS_GCB(); - - /* Match (prepend)* */ - while (locinput < PL_regeol - && swash_fetch(PL_utf8_X_prepend, - (U8*)locinput, do_utf8)) - { - previous_prepend = locinput; - locinput += UTF8SKIP(locinput); - } - - /* As noted above, if we matched a prepend character, but - * the next thing won't match, back off the last prepend we - * matched, as it is guaranteed to match the begin */ - if (previous_prepend - && (locinput >= PL_regeol - || ! swash_fetch(PL_utf8_X_begin, - (U8*)locinput, do_utf8))) - { - locinput = previous_prepend; - } - - /* Note that here we know PL_regeol > locinput, as we - * tested that upon input to this switch case, and if we - * moved locinput forward, we tested the result just above - * and it either passed, or we backed off so that it will - * now pass */ - if (! swash_fetch(PL_utf8_X_begin, (U8*)locinput, do_utf8)) { - - /* Here did not match the required 'Begin' in the - * second term. So just match the very first - * character, the '.' of the final term of the regex */ - locinput = starting + UTF8SKIP(starting); - } else { - - /* Here is the beginning of a character that can have - * an extender. It is either a hangul syllable, or a - * non-control */ - if (swash_fetch(PL_utf8_X_non_hangul, - (U8*)locinput, do_utf8)) - { - - /* Here not a Hangul syllable, must be a - * ('! * Control') */ - locinput += UTF8SKIP(locinput); - } else { - - /* Here is a Hangul syllable. It can be composed - * of several individual characters. One - * possibility is T+ */ - if (swash_fetch(PL_utf8_X_T, - (U8*)locinput, do_utf8)) - { - while (locinput < PL_regeol - && swash_fetch(PL_utf8_X_T, - (U8*)locinput, do_utf8)) - { - locinput += UTF8SKIP(locinput); - } - } else { - - /* Here, not T+, but is a Hangul. That means - * it is one of the others: L, LV, LVT or V, - * and matches: - * L* (L | LVT T* | V V* T* | LV V* T*) */ - - /* Match L* */ - while (locinput < PL_regeol - && swash_fetch(PL_utf8_X_L, - (U8*)locinput, do_utf8)) - { - locinput += UTF8SKIP(locinput); - } - - /* Here, have exhausted L*. If the next - * character is not an LV, LVT nor V, it means - * we had to have at least one L, so matches L+ - * in the original equation, we have a complete - * hangul syllable. Are done. */ - - if (locinput < PL_regeol - && swash_fetch(PL_utf8_X_LV_LVT_V, - (U8*)locinput, do_utf8)) - { - - /* Otherwise keep going. Must be LV, LVT - * or V. See if LVT */ - if (swash_fetch(PL_utf8_X_LVT, - (U8*)locinput, do_utf8)) - { - locinput += UTF8SKIP(locinput); - } else { - - /* Must be V or LV. Take it, then - * match V* */ - locinput += UTF8SKIP(locinput); - while (locinput < PL_regeol - && swash_fetch(PL_utf8_X_V, - (U8*)locinput, do_utf8)) - { - locinput += UTF8SKIP(locinput); - } - } - - /* And any of LV, LVT, or V can be followed - * by T* */ - while (locinput < PL_regeol - && swash_fetch(PL_utf8_X_T, - (U8*)locinput, - do_utf8)) - { - locinput += UTF8SKIP(locinput); - } - } - } - } - - /* Match any extender */ - while (locinput < PL_regeol - && swash_fetch(PL_utf8_X_extend, - (U8*)locinput, do_utf8)) - { - locinput += UTF8SKIP(locinput); - } - } - } - if (locinput > PL_regeol) sayNO; - } - nextchr = UCHARAT(locinput); - break; - - case NREFFL: - { - char *s; - char type; - PL_reg_flags |= RF_tainted; - /* FALL THROUGH */ - case NREF: - case NREFF: - type = OP(scan); - n = reg_check_named_buff_matched(rex,scan); - - if ( n ) { - type = REF + ( type - NREF ); - goto do_ref; - } else { - sayNO; - } - /* unreached */ - case REFFL: - PL_reg_flags |= RF_tainted; - /* FALL THROUGH */ - case REF: - case REFF: - n = ARG(scan); /* which paren pair */ - type = OP(scan); - do_ref: - ln = PL_regoffs[n].start; - PL_reg_leftiter = PL_reg_maxiter; /* Void cache */ - if (*PL_reglastparen < n || ln == -1) - sayNO; /* Do not match unless seen CLOSEn. */ - if (ln == PL_regoffs[n].end) - break; - - s = PL_bostr + ln; - if (do_utf8 && type != REF) { /* REF can do byte comparison */ - char *l = locinput; - const char *e = PL_bostr + PL_regoffs[n].end; - /* - * Note that we can't do the "other character" lookup trick as - * in the 8-bit case (no pun intended) because in Unicode we - * have to map both upper and title case to lower case. - */ - if (type == REFF) { - while (s < e) { - STRLEN ulen1, ulen2; - U8 tmpbuf1[UTF8_MAXBYTES_CASE+1]; - U8 tmpbuf2[UTF8_MAXBYTES_CASE+1]; - - if (l >= PL_regeol) - sayNO; - toLOWER_utf8((U8*)s, tmpbuf1, &ulen1); - toLOWER_utf8((U8*)l, tmpbuf2, &ulen2); - if (ulen1 != ulen2 || memNE((char *)tmpbuf1, (char *)tmpbuf2, ulen1)) - sayNO; - s += ulen1; - l += ulen2; - } - } - locinput = l; - nextchr = UCHARAT(locinput); - break; - } - - /* Inline the first character, for speed. */ - if (UCHARAT(s) != nextchr && - (type == REF || - (UCHARAT(s) != (type == REFF - ? PL_fold : PL_fold_locale)[nextchr]))) - sayNO; - ln = PL_regoffs[n].end - ln; - if (locinput + ln > PL_regeol) - sayNO; - if (ln > 1 && (type == REF - ? memNE(s, locinput, ln) - : (type == REFF - ? ibcmp(s, locinput, ln) - : ibcmp_locale(s, locinput, ln)))) - sayNO; - locinput += ln; - nextchr = UCHARAT(locinput); - break; - } - case NOTHING: - case TAIL: - break; - case BACK: - break; - -#undef ST -#define ST st->u.eval - { - SV *ret; - REGEXP *re_sv; - regexp *re; - regexp_internal *rei; - regnode *startpoint; - - case GOSTART: - case GOSUB: /* /(...(?1))/ /(...(?&foo))/ */ - if (cur_eval && cur_eval->locinput==locinput) { - if (cur_eval->u.eval.close_paren == (U32)ARG(scan)) - Perl_croak(aTHX_ "Infinite recursion in regex"); - if ( ++nochange_depth > max_nochange_depth ) - Perl_croak(aTHX_ - "Pattern subroutine nesting without pos change" - " exceeded limit in regex"); - } else { - nochange_depth = 0; - } - re_sv = rex_sv; - re = rex; - rei = rexi; - (void)ReREFCNT_inc(rex_sv); - if (OP(scan)==GOSUB) { - startpoint = scan + ARG2L(scan); - ST.close_paren = ARG(scan); - } else { - startpoint = rei->program+1; - ST.close_paren = 0; - } - goto eval_recurse_doit; - /* NOTREACHED */ - case EVAL: /* /(?{A})B/ /(??{A})B/ and /(?(?{A})X|Y)B/ */ - if (cur_eval && cur_eval->locinput==locinput) { - if ( ++nochange_depth > max_nochange_depth ) - Perl_croak(aTHX_ "EVAL without pos change exceeded limit in regex"); - } else { - nochange_depth = 0; - } - { - /* execute the code in the {...} */ - dSP; - SV ** const before = SP; - OP_4tree * const oop = PL_op; - COP * const ocurcop = PL_curcop; - PAD *old_comppad; - char *saved_regeol = PL_regeol; - - n = ARG(scan); - PL_op = (OP_4tree*)rexi->data->data[n]; - DEBUG_STATE_r( PerlIO_printf(Perl_debug_log, - " re_eval 0x%"UVxf"\n", PTR2UV(PL_op)) ); - PAD_SAVE_LOCAL(old_comppad, (PAD*)rexi->data->data[n + 2]); - PL_regoffs[0].end = PL_reg_magic->mg_len = locinput - PL_bostr; - - if (sv_yes_mark) { - SV *sv_mrk = get_sv("REGMARK", 1); - sv_setsv(sv_mrk, sv_yes_mark); - } - - CALLRUNOPS(aTHX); /* Scalar context. */ - SPAGAIN; - if (SP == before) - ret = &PL_sv_undef; /* protect against empty (?{}) blocks. */ - else { - ret = POPs; - PUTBACK; - } - - PL_op = oop; - PAD_RESTORE_LOCAL(old_comppad); - PL_curcop = ocurcop; - PL_regeol = saved_regeol; - if (!logical) { - /* /(?{...})/ */ - sv_setsv(save_scalar(PL_replgv), ret); - break; - } - } - if (logical == 2) { /* Postponed subexpression: /(??{...})/ */ - logical = 0; - { - /* extract RE object from returned value; compiling if - * necessary */ - MAGIC *mg = NULL; - REGEXP *rx = NULL; - - if (SvROK(ret)) { - SV *const sv = SvRV(ret); - - if (SvTYPE(sv) == SVt_REGEXP) { - rx = (REGEXP*) sv; - } else if (SvSMAGICAL(sv)) { - mg = mg_find(sv, PERL_MAGIC_qr); - assert(mg); - } - } else if (SvTYPE(ret) == SVt_REGEXP) { - rx = (REGEXP*) ret; - } else if (SvSMAGICAL(ret)) { - if (SvGMAGICAL(ret)) { - /* I don't believe that there is ever qr magic - here. */ - assert(!mg_find(ret, PERL_MAGIC_qr)); - sv_unmagic(ret, PERL_MAGIC_qr); - } - else { - mg = mg_find(ret, PERL_MAGIC_qr); - /* testing suggests mg only ends up non-NULL for - scalars who were upgraded and compiled in the - else block below. In turn, this is only - triggered in the "postponed utf8 string" tests - in t/op/pat.t */ - } - } - - if (mg) { - rx = (REGEXP *) mg->mg_obj; /*XXX:dmq*/ - assert(rx); - } - if (rx) { - rx = reg_temp_copy(NULL, rx); - } - else { - U32 pm_flags = 0; - const I32 osize = PL_regsize; - - if (DO_UTF8(ret)) { - assert (SvUTF8(ret)); - } else if (SvUTF8(ret)) { - /* Not doing UTF-8, despite what the SV says. Is - this only if we're trapped in use 'bytes'? */ - /* Make a copy of the octet sequence, but without - the flag on, as the compiler now honours the - SvUTF8 flag on ret. */ - STRLEN len; - const char *const p = SvPV(ret, len); - ret = newSVpvn_flags(p, len, SVs_TEMP); - } - rx = CALLREGCOMP(ret, pm_flags); - if (!(SvFLAGS(ret) - & (SVs_TEMP | SVs_PADTMP | SVf_READONLY - | SVs_GMG))) { - /* This isn't a first class regexp. Instead, it's - caching a regexp onto an existing, Perl visible - scalar. */ - sv_magic(ret, MUTABLE_SV(rx), PERL_MAGIC_qr, 0, 0); - } - PL_regsize = osize; - } - re_sv = rx; - re = (struct regexp *)SvANY(rx); - } - RXp_MATCH_COPIED_off(re); - re->subbeg = rex->subbeg; - re->sublen = rex->sublen; - rei = RXi_GET(re); - DEBUG_EXECUTE_r( - debug_start_match(re_sv, do_utf8, locinput, PL_regeol, - "Matching embedded"); - ); - startpoint = rei->program + 1; - ST.close_paren = 0; /* only used for GOSUB */ - /* borrowed from regtry */ - if (PL_reg_start_tmpl <= re->nparens) { - PL_reg_start_tmpl = re->nparens*3/2 + 3; - if(PL_reg_start_tmp) - Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*); - else - Newx(PL_reg_start_tmp, PL_reg_start_tmpl, char*); - } - - eval_recurse_doit: /* Share code with GOSUB below this line */ - /* run the pattern returned from (??{...}) */ - ST.cp = regcppush(0); /* Save *all* the positions. */ - REGCP_SET(ST.lastcp); - - PL_regoffs = re->offs; /* essentially NOOP on GOSUB */ - - /* see regtry, specifically PL_reglast(?:close)?paren is a pointer! (i dont know why) :dmq */ - PL_reglastparen = &re->lastparen; - PL_reglastcloseparen = &re->lastcloseparen; - re->lastparen = 0; - re->lastcloseparen = 0; - - PL_reginput = locinput; - PL_regsize = 0; - - /* XXXX This is too dramatic a measure... */ - PL_reg_maxiter = 0; - - ST.toggle_reg_flags = PL_reg_flags; - if (RX_UTF8(re_sv)) - PL_reg_flags |= RF_utf8; - else - PL_reg_flags &= ~RF_utf8; - ST.toggle_reg_flags ^= PL_reg_flags; /* diff of old and new */ - - ST.prev_rex = rex_sv; - ST.prev_curlyx = cur_curlyx; - SETREX(rex_sv,re_sv); - rex = re; - rexi = rei; - cur_curlyx = NULL; - ST.B = next; - ST.prev_eval = cur_eval; - cur_eval = st; - /* now continue from first node in postoned RE */ - PUSH_YES_STATE_GOTO(EVAL_AB, startpoint); - /* NOTREACHED */ - } - /* logical is 1, /(?(?{...})X|Y)/ */ - sw = (bool)SvTRUE(ret); - logical = 0; - break; - } - - case EVAL_AB: /* cleanup after a successful (??{A})B */ - /* note: this is called twice; first after popping B, then A */ - PL_reg_flags ^= ST.toggle_reg_flags; - ReREFCNT_dec(rex_sv); - SETREX(rex_sv,ST.prev_rex); - rex = (struct regexp *)SvANY(rex_sv); - rexi = RXi_GET(rex); - regcpblow(ST.cp); - cur_eval = ST.prev_eval; - cur_curlyx = ST.prev_curlyx; - - /* rex was changed so update the pointer in PL_reglastparen and PL_reglastcloseparen */ - PL_reglastparen = &rex->lastparen; - PL_reglastcloseparen = &rex->lastcloseparen; - /* also update PL_regoffs */ - PL_regoffs = rex->offs; - - /* XXXX This is too dramatic a measure... */ - PL_reg_maxiter = 0; - if ( nochange_depth ) - nochange_depth--; - sayYES; - - - case EVAL_AB_fail: /* unsuccessfully ran A or B in (??{A})B */ - /* note: this is called twice; first after popping B, then A */ - PL_reg_flags ^= ST.toggle_reg_flags; - ReREFCNT_dec(rex_sv); - SETREX(rex_sv,ST.prev_rex); - rex = (struct regexp *)SvANY(rex_sv); - rexi = RXi_GET(rex); - /* rex was changed so update the pointer in PL_reglastparen and PL_reglastcloseparen */ - PL_reglastparen = &rex->lastparen; - PL_reglastcloseparen = &rex->lastcloseparen; - - PL_reginput = locinput; - REGCP_UNWIND(ST.lastcp); - regcppop(rex); - cur_eval = ST.prev_eval; - cur_curlyx = ST.prev_curlyx; - /* XXXX This is too dramatic a measure... */ - PL_reg_maxiter = 0; - if ( nochange_depth ) - nochange_depth--; - sayNO_SILENT; -#undef ST - - case OPEN: - n = ARG(scan); /* which paren pair */ - PL_reg_start_tmp[n] = locinput; - if (n > PL_regsize) - PL_regsize = n; - lastopen = n; - break; - case CLOSE: - n = ARG(scan); /* which paren pair */ - PL_regoffs[n].start = PL_reg_start_tmp[n] - PL_bostr; - PL_regoffs[n].end = locinput - PL_bostr; - /*if (n > PL_regsize) - PL_regsize = n;*/ - if (n > *PL_reglastparen) - *PL_reglastparen = n; - *PL_reglastcloseparen = n; - if (cur_eval && cur_eval->u.eval.close_paren == n) { - goto fake_end; - } - break; - case ACCEPT: - if (ARG(scan)){ - regnode *cursor; - for (cursor=scan; - cursor && OP(cursor)!=END; - cursor=regnext(cursor)) - { - if ( OP(cursor)==CLOSE ){ - n = ARG(cursor); - if ( n <= lastopen ) { - PL_regoffs[n].start - = PL_reg_start_tmp[n] - PL_bostr; - PL_regoffs[n].end = locinput - PL_bostr; - /*if (n > PL_regsize) - PL_regsize = n;*/ - if (n > *PL_reglastparen) - *PL_reglastparen = n; - *PL_reglastcloseparen = n; - if ( n == ARG(scan) || (cur_eval && - cur_eval->u.eval.close_paren == n)) - break; - } - } - } - } - goto fake_end; - /*NOTREACHED*/ - case GROUPP: - n = ARG(scan); /* which paren pair */ - sw = (bool)(*PL_reglastparen >= n && PL_regoffs[n].end != -1); - break; - case NGROUPP: - /* reg_check_named_buff_matched returns 0 for no match */ - sw = (bool)(0 < reg_check_named_buff_matched(rex,scan)); - break; - case INSUBP: - n = ARG(scan); - sw = (cur_eval && (!n || cur_eval->u.eval.close_paren == n)); - break; - case DEFINEP: - sw = 0; - break; - case IFTHEN: - PL_reg_leftiter = PL_reg_maxiter; /* Void cache */ - if (sw) - next = NEXTOPER(NEXTOPER(scan)); - else { - next = scan + ARG(scan); - if (OP(next) == IFTHEN) /* Fake one. */ - next = NEXTOPER(NEXTOPER(next)); - } - break; - case LOGICAL: - logical = scan->flags; - break; - -/******************************************************************* - -The CURLYX/WHILEM pair of ops handle the most generic case of the /A*B/ -pattern, where A and B are subpatterns. (For simple A, CURLYM or -STAR/PLUS/CURLY/CURLYN are used instead.) - -A*B is compiled as - -On entry to the subpattern, CURLYX is called. This pushes a CURLYX -state, which contains the current count, initialised to -1. It also sets -cur_curlyx to point to this state, with any previous value saved in the -state block. - -CURLYX then jumps straight to the WHILEM op, rather than executing A, -since the pattern may possibly match zero times (i.e. it's a while {} loop -rather than a do {} while loop). - -Each entry to WHILEM represents a successful match of A. The count in the -CURLYX block is incremented, another WHILEM state is pushed, and execution -passes to A or B depending on greediness and the current count. - -For example, if matching against the string a1a2a3b (where the aN are -substrings that match /A/), then the match progresses as follows: (the -pushed states are interspersed with the bits of strings matched so far): - - - - a1 - a1 a2 - a1 a2 a3 - a1 a2 a3 b - -(Contrast this with something like CURLYM, which maintains only a single -backtrack state: - - a1 - a1 a2 - a1 a2 a3 - a1 a2 a3 b -) - -Each WHILEM state block marks a point to backtrack to upon partial failure -of A or B, and also contains some minor state data related to that -iteration. The CURLYX block, pointed to by cur_curlyx, contains the -overall state, such as the count, and pointers to the A and B ops. - -This is complicated slightly by nested CURLYX/WHILEM's. Since cur_curlyx -must always point to the *current* CURLYX block, the rules are: - -When executing CURLYX, save the old cur_curlyx in the CURLYX state block, -and set cur_curlyx to point the new block. - -When popping the CURLYX block after a successful or unsuccessful match, -restore the previous cur_curlyx. - -When WHILEM is about to execute B, save the current cur_curlyx, and set it -to the outer one saved in the CURLYX block. - -When popping the WHILEM block after a successful or unsuccessful B match, -restore the previous cur_curlyx. - -Here's an example for the pattern (AI* BI)*BO -I and O refer to inner and outer, C and W refer to CURLYX and WHILEM: - -cur_ -curlyx backtrack stack ------- --------------- -NULL -CO -CI ai -CO ai bi -NULL ai bi bo - -At this point the pattern succeeds, and we work back down the stack to -clean up, restoring as we go: - -CO ai bi -CI ai -CO -NULL - -*******************************************************************/ - -#define ST st->u.curlyx - - case CURLYX: /* start of /A*B/ (for complex A) */ - { - /* No need to save/restore up to this paren */ - I32 parenfloor = scan->flags; - - assert(next); /* keep Coverity happy */ - if (OP(PREVOPER(next)) == NOTHING) /* LONGJMP */ - next += ARG(next); - - /* XXXX Probably it is better to teach regpush to support - parenfloor > PL_regsize... */ - if (parenfloor > (I32)*PL_reglastparen) - parenfloor = *PL_reglastparen; /* Pessimization... */ - - ST.prev_curlyx= cur_curlyx; - cur_curlyx = st; - ST.cp = PL_savestack_ix; - - /* these fields contain the state of the current curly. - * they are accessed by subsequent WHILEMs */ - ST.parenfloor = parenfloor; - ST.min = ARG1(scan); - ST.max = ARG2(scan); - ST.A = NEXTOPER(scan) + EXTRA_STEP_2ARGS; - ST.B = next; - ST.minmod = minmod; - minmod = 0; - ST.count = -1; /* this will be updated by WHILEM */ - ST.lastloc = NULL; /* this will be updated by WHILEM */ - - PL_reginput = locinput; - PUSH_YES_STATE_GOTO(CURLYX_end, PREVOPER(next)); - /* NOTREACHED */ - } - - case CURLYX_end: /* just finished matching all of A*B */ - cur_curlyx = ST.prev_curlyx; - sayYES; - /* NOTREACHED */ - - case CURLYX_end_fail: /* just failed to match all of A*B */ - regcpblow(ST.cp); - cur_curlyx = ST.prev_curlyx; - sayNO; - /* NOTREACHED */ - - -#undef ST -#define ST st->u.whilem - - case WHILEM: /* just matched an A in /A*B/ (for complex A) */ - { - /* see the discussion above about CURLYX/WHILEM */ - I32 n; - assert(cur_curlyx); /* keep Coverity happy */ - n = ++cur_curlyx->u.curlyx.count; /* how many A's matched */ - ST.save_lastloc = cur_curlyx->u.curlyx.lastloc; - ST.cache_offset = 0; - ST.cache_mask = 0; - - PL_reginput = locinput; - - DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, - "%*s whilem: matched %ld out of %ld..%ld\n", - REPORT_CODE_OFF+depth*2, "", (long)n, - (long)cur_curlyx->u.curlyx.min, - (long)cur_curlyx->u.curlyx.max) - ); - - /* First just match a string of min A's. */ - - if (n < cur_curlyx->u.curlyx.min) { - cur_curlyx->u.curlyx.lastloc = locinput; - PUSH_STATE_GOTO(WHILEM_A_pre, cur_curlyx->u.curlyx.A); - /* NOTREACHED */ - } - - /* If degenerate A matches "", assume A done. */ - - if (locinput == cur_curlyx->u.curlyx.lastloc) { - DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, - "%*s whilem: empty match detected, trying continuation...\n", - REPORT_CODE_OFF+depth*2, "") - ); - goto do_whilem_B_max; - } - - /* super-linear cache processing */ - - if (scan->flags) { - - if (!PL_reg_maxiter) { - /* start the countdown: Postpone detection until we - * know the match is not *that* much linear. */ - PL_reg_maxiter = (PL_regeol - PL_bostr + 1) * (scan->flags>>4); - /* possible overflow for long strings and many CURLYX's */ - if (PL_reg_maxiter < 0) - PL_reg_maxiter = I32_MAX; - PL_reg_leftiter = PL_reg_maxiter; - } - - if (PL_reg_leftiter-- == 0) { - /* initialise cache */ - const I32 size = (PL_reg_maxiter + 7)/8; - if (PL_reg_poscache) { - if ((I32)PL_reg_poscache_size < size) { - Renew(PL_reg_poscache, size, char); - PL_reg_poscache_size = size; - } - Zero(PL_reg_poscache, size, char); - } - else { - PL_reg_poscache_size = size; - Newxz(PL_reg_poscache, size, char); - } - DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, - "%swhilem: Detected a super-linear match, switching on caching%s...\n", - PL_colors[4], PL_colors[5]) - ); - } - - if (PL_reg_leftiter < 0) { - /* have we already failed at this position? */ - I32 offset, mask; - offset = (scan->flags & 0xf) - 1 - + (locinput - PL_bostr) * (scan->flags>>4); - mask = 1 << (offset % 8); - offset /= 8; - if (PL_reg_poscache[offset] & mask) { - DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log, - "%*s whilem: (cache) already tried at this position...\n", - REPORT_CODE_OFF+depth*2, "") - ); - sayNO; /* cache records failure */ - } - ST.cache_offset = offset; - ST.cache_mask = mask; - } - } - - /* Prefer B over A for minimal matching. */ - - if (cur_curlyx->u.curlyx.minmod) { - ST.save_curlyx = cur_curlyx; - cur_curlyx = cur_curlyx->u.curlyx.prev_curlyx; - ST.cp = regcppush(ST.save_curlyx->u.curlyx.parenfloor); - REGCP_SET(ST.lastcp); - PUSH_YES_STATE_GOTO(WHILEM_B_min, ST.save_curlyx->u.curlyx.B); - /* NOTREACHED */ - } - - /* Prefer A over B for maximal matching. */ - - if (n < cur_curlyx->u.curlyx.max) { /* More greed allowed? */ - ST.cp = regcppush(cur_curlyx->u.curlyx.parenfloor); - cur_curlyx->u.curlyx.lastloc = locinput; - REGCP_SET(ST.lastcp); - PUSH_STATE_GOTO(WHILEM_A_max, cur_curlyx->u.curlyx.A); - /* NOTREACHED */ - } - goto do_whilem_B_max; - } - /* NOTREACHED */ - - case WHILEM_B_min: /* just matched B in a minimal match */ - case WHILEM_B_max: /* just matched B in a maximal match */ - cur_curlyx = ST.save_curlyx; - sayYES; - /* NOTREACHED */ - - case WHILEM_B_max_fail: /* just failed to match B in a maximal match */ - cur_curlyx = ST.save_curlyx; - cur_curlyx->u.curlyx.lastloc = ST.save_lastloc; - cur_curlyx->u.curlyx.count--; - CACHEsayNO; - /* NOTREACHED */ - - case WHILEM_A_min_fail: /* just failed to match A in a minimal match */ - REGCP_UNWIND(ST.lastcp); - regcppop(rex); - /* FALL THROUGH */ - case WHILEM_A_pre_fail: /* just failed to match even minimal A */ - cur_curlyx->u.curlyx.lastloc = ST.save_lastloc; - cur_curlyx->u.curlyx.count--; - CACHEsayNO; - /* NOTREACHED */ - - case WHILEM_A_max_fail: /* just failed to match A in a maximal match */ - REGCP_UNWIND(ST.lastcp); - regcppop(rex); /* Restore some previous $s? */ - PL_reginput = locinput; - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - "%*s whilem: failed, trying continuation...\n", - REPORT_CODE_OFF+depth*2, "") - ); - do_whilem_B_max: - if (cur_curlyx->u.curlyx.count >= REG_INFTY - && ckWARN(WARN_REGEXP) - && !(PL_reg_flags & RF_warned)) - { - PL_reg_flags |= RF_warned; - Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s limit (%d) exceeded", - "Complex regular subexpression recursion", - REG_INFTY - 1); - } - - /* now try B */ - ST.save_curlyx = cur_curlyx; - cur_curlyx = cur_curlyx->u.curlyx.prev_curlyx; - PUSH_YES_STATE_GOTO(WHILEM_B_max, ST.save_curlyx->u.curlyx.B); - /* NOTREACHED */ - - case WHILEM_B_min_fail: /* just failed to match B in a minimal match */ - cur_curlyx = ST.save_curlyx; - REGCP_UNWIND(ST.lastcp); - regcppop(rex); - - if (cur_curlyx->u.curlyx.count >= cur_curlyx->u.curlyx.max) { - /* Maximum greed exceeded */ - if (cur_curlyx->u.curlyx.count >= REG_INFTY - && ckWARN(WARN_REGEXP) - && !(PL_reg_flags & RF_warned)) - { - PL_reg_flags |= RF_warned; - Perl_warner(aTHX_ packWARN(WARN_REGEXP), - "%s limit (%d) exceeded", - "Complex regular subexpression recursion", - REG_INFTY - 1); - } - cur_curlyx->u.curlyx.count--; - CACHEsayNO; - } - - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - "%*s trying longer...\n", REPORT_CODE_OFF+depth*2, "") - ); - /* Try grabbing another A and see if it helps. */ - PL_reginput = locinput; - cur_curlyx->u.curlyx.lastloc = locinput; - ST.cp = regcppush(cur_curlyx->u.curlyx.parenfloor); - REGCP_SET(ST.lastcp); - PUSH_STATE_GOTO(WHILEM_A_min, ST.save_curlyx->u.curlyx.A); - /* NOTREACHED */ - -#undef ST -#define ST st->u.branch - - case BRANCHJ: /* /(...|A|...)/ with long next pointer */ - next = scan + ARG(scan); - if (next == scan) - next = NULL; - scan = NEXTOPER(scan); - /* FALL THROUGH */ - - case BRANCH: /* /(...|A|...)/ */ - scan = NEXTOPER(scan); /* scan now points to inner node */ - ST.lastparen = *PL_reglastparen; - ST.next_branch = next; - REGCP_SET(ST.cp); - PL_reginput = locinput; - - /* Now go into the branch */ - if (has_cutgroup) { - PUSH_YES_STATE_GOTO(BRANCH_next, scan); - } else { - PUSH_STATE_GOTO(BRANCH_next, scan); - } - /* NOTREACHED */ - case CUTGROUP: - PL_reginput = locinput; - sv_yes_mark = st->u.mark.mark_name = scan->flags ? NULL : - MUTABLE_SV(rexi->data->data[ ARG( scan ) ]); - PUSH_STATE_GOTO(CUTGROUP_next,next); - /* NOTREACHED */ - case CUTGROUP_next_fail: - do_cutgroup = 1; - no_final = 1; - if (st->u.mark.mark_name) - sv_commit = st->u.mark.mark_name; - sayNO; - /* NOTREACHED */ - case BRANCH_next: - sayYES; - /* NOTREACHED */ - case BRANCH_next_fail: /* that branch failed; try the next, if any */ - if (do_cutgroup) { - do_cutgroup = 0; - no_final = 0; - } - REGCP_UNWIND(ST.cp); - for (n = *PL_reglastparen; n > ST.lastparen; n--) - PL_regoffs[n].end = -1; - *PL_reglastparen = n; - /*dmq: *PL_reglastcloseparen = n; */ - scan = ST.next_branch; - /* no more branches? */ - if (!scan || (OP(scan) != BRANCH && OP(scan) != BRANCHJ)) { - DEBUG_EXECUTE_r({ - PerlIO_printf( Perl_debug_log, - "%*s %sBRANCH failed...%s\n", - REPORT_CODE_OFF+depth*2, "", - PL_colors[4], - PL_colors[5] ); - }); - sayNO_SILENT; - } - continue; /* execute next BRANCH[J] op */ - /* NOTREACHED */ - - case MINMOD: - minmod = 1; - break; - -#undef ST -#define ST st->u.curlym - - case CURLYM: /* /A{m,n}B/ where A is fixed-length */ - - /* This is an optimisation of CURLYX that enables us to push - * only a single backtracking state, no matter how many matches - * there are in {m,n}. It relies on the pattern being constant - * length, with no parens to influence future backrefs - */ - - ST.me = scan; - scan = NEXTOPER(scan) + NODE_STEP_REGNODE; - - /* if paren positive, emulate an OPEN/CLOSE around A */ - if (ST.me->flags) { - U32 paren = ST.me->flags; - if (paren > PL_regsize) - PL_regsize = paren; - if (paren > *PL_reglastparen) - *PL_reglastparen = paren; - scan += NEXT_OFF(scan); /* Skip former OPEN. */ - } - ST.A = scan; - ST.B = next; - ST.alen = 0; - ST.count = 0; - ST.minmod = minmod; - minmod = 0; - ST.c1 = CHRTEST_UNINIT; - REGCP_SET(ST.cp); - - if (!(ST.minmod ? ARG1(ST.me) : ARG2(ST.me))) /* min/max */ - goto curlym_do_B; - - curlym_do_A: /* execute the A in /A{m,n}B/ */ - PL_reginput = locinput; - PUSH_YES_STATE_GOTO(CURLYM_A, ST.A); /* match A */ - /* NOTREACHED */ - - case CURLYM_A: /* we've just matched an A */ - locinput = st->locinput; - nextchr = UCHARAT(locinput); - - ST.count++; - /* after first match, determine A's length: u.curlym.alen */ - if (ST.count == 1) { - if (PL_reg_match_utf8) { - char *s = locinput; - while (s < PL_reginput) { - ST.alen++; - s += UTF8SKIP(s); - } - } - else { - ST.alen = PL_reginput - locinput; - } - if (ST.alen == 0) - ST.count = ST.minmod ? ARG1(ST.me) : ARG2(ST.me); - } - DEBUG_EXECUTE_r( - PerlIO_printf(Perl_debug_log, - "%*s CURLYM now matched %"IVdf" times, len=%"IVdf"...\n", - (int)(REPORT_CODE_OFF+(depth*2)), "", - (IV) ST.count, (IV)ST.alen) - ); - - locinput = PL_reginput; - - if (cur_eval && cur_eval->u.eval.close_paren && - cur_eval->u.eval.close_paren == (U32)ST.me->flags) - goto fake_end; - - { - I32 max = (ST.minmod ? ARG1(ST.me) : ARG2(ST.me)); - if ( max == REG_INFTY || ST.count < max ) - goto curlym_do_A; /* try to match another A */ - } - goto curlym_do_B; /* try to match B */ - - case CURLYM_A_fail: /* just failed to match an A */ - REGCP_UNWIND(ST.cp); - - if (ST.minmod || ST.count < ARG1(ST.me) /* min*/ - || (cur_eval && cur_eval->u.eval.close_paren && - cur_eval->u.eval.close_paren == (U32)ST.me->flags)) - sayNO; - - curlym_do_B: /* execute the B in /A{m,n}B/ */ - PL_reginput = locinput; - if (ST.c1 == CHRTEST_UNINIT) { - /* calculate c1 and c2 for possible match of 1st char - * following curly */ - ST.c1 = ST.c2 = CHRTEST_VOID; - if (HAS_TEXT(ST.B) || JUMPABLE(ST.B)) { - regnode *text_node = ST.B; - if (! HAS_TEXT(text_node)) - FIND_NEXT_IMPT(text_node); - /* this used to be - - (HAS_TEXT(text_node) && PL_regkind[OP(text_node)] == EXACT) - - But the former is redundant in light of the latter. - - if this changes back then the macro for - IS_TEXT and friends need to change. - */ - if (PL_regkind[OP(text_node)] == EXACT) - { - - ST.c1 = (U8)*STRING(text_node); - ST.c2 = - (IS_TEXTF(text_node)) - ? PL_fold[ST.c1] - : (IS_TEXTFL(text_node)) - ? PL_fold_locale[ST.c1] - : ST.c1; - } - } - } - - DEBUG_EXECUTE_r( - PerlIO_printf(Perl_debug_log, - "%*s CURLYM trying tail with matches=%"IVdf"...\n", - (int)(REPORT_CODE_OFF+(depth*2)), - "", (IV)ST.count) - ); - if (ST.c1 != CHRTEST_VOID - && UCHARAT(PL_reginput) != ST.c1 - && UCHARAT(PL_reginput) != ST.c2) - { - /* simulate B failing */ - DEBUG_OPTIMISE_r( - PerlIO_printf(Perl_debug_log, - "%*s CURLYM Fast bail c1=%"IVdf" c2=%"IVdf"\n", - (int)(REPORT_CODE_OFF+(depth*2)),"", - (IV)ST.c1,(IV)ST.c2 - )); - state_num = CURLYM_B_fail; - goto reenter_switch; - } - - if (ST.me->flags) { - /* mark current A as captured */ - I32 paren = ST.me->flags; - if (ST.count) { - PL_regoffs[paren].start - = HOPc(PL_reginput, -ST.alen) - PL_bostr; - PL_regoffs[paren].end = PL_reginput - PL_bostr; - /*dmq: *PL_reglastcloseparen = paren; */ - } - else - PL_regoffs[paren].end = -1; - if (cur_eval && cur_eval->u.eval.close_paren && - cur_eval->u.eval.close_paren == (U32)ST.me->flags) - { - if (ST.count) - goto fake_end; - else - sayNO; - } - } - - PUSH_STATE_GOTO(CURLYM_B, ST.B); /* match B */ - /* NOTREACHED */ - - case CURLYM_B_fail: /* just failed to match a B */ - REGCP_UNWIND(ST.cp); - if (ST.minmod) { - I32 max = ARG2(ST.me); - if (max != REG_INFTY && ST.count == max) - sayNO; - goto curlym_do_A; /* try to match a further A */ - } - /* backtrack one A */ - if (ST.count == ARG1(ST.me) /* min */) - sayNO; - ST.count--; - locinput = HOPc(locinput, -ST.alen); - goto curlym_do_B; /* try to match B */ - -#undef ST -#define ST st->u.curly - -#define CURLY_SETPAREN(paren, success) \ - if (paren) { \ - if (success) { \ - PL_regoffs[paren].start = HOPc(locinput, -1) - PL_bostr; \ - PL_regoffs[paren].end = locinput - PL_bostr; \ - *PL_reglastcloseparen = paren; \ - } \ - else \ - PL_regoffs[paren].end = -1; \ - } - - case STAR: /* /A*B/ where A is width 1 */ - ST.paren = 0; - ST.min = 0; - ST.max = REG_INFTY; - scan = NEXTOPER(scan); - goto repeat; - case PLUS: /* /A+B/ where A is width 1 */ - ST.paren = 0; - ST.min = 1; - ST.max = REG_INFTY; - scan = NEXTOPER(scan); - goto repeat; - case CURLYN: /* /(A){m,n}B/ where A is width 1 */ - ST.paren = scan->flags; /* Which paren to set */ - if (ST.paren > PL_regsize) - PL_regsize = ST.paren; - if (ST.paren > *PL_reglastparen) - *PL_reglastparen = ST.paren; - ST.min = ARG1(scan); /* min to match */ - ST.max = ARG2(scan); /* max to match */ - if (cur_eval && cur_eval->u.eval.close_paren && - cur_eval->u.eval.close_paren == (U32)ST.paren) { - ST.min=1; - ST.max=1; - } - scan = regnext(NEXTOPER(scan) + NODE_STEP_REGNODE); - goto repeat; - case CURLY: /* /A{m,n}B/ where A is width 1 */ - ST.paren = 0; - ST.min = ARG1(scan); /* min to match */ - ST.max = ARG2(scan); /* max to match */ - scan = NEXTOPER(scan) + NODE_STEP_REGNODE; - repeat: - /* - * Lookahead to avoid useless match attempts - * when we know what character comes next. - * - * Used to only do .*x and .*?x, but now it allows - * for )'s, ('s and (?{ ... })'s to be in the way - * of the quantifier and the EXACT-like node. -- japhy - */ - - if (ST.min > ST.max) /* XXX make this a compile-time check? */ - sayNO; - if (HAS_TEXT(next) || JUMPABLE(next)) { - U8 *s; - regnode *text_node = next; - - if (! HAS_TEXT(text_node)) - FIND_NEXT_IMPT(text_node); - - if (! HAS_TEXT(text_node)) - ST.c1 = ST.c2 = CHRTEST_VOID; - else { - if ( PL_regkind[OP(text_node)] != EXACT ) { - ST.c1 = ST.c2 = CHRTEST_VOID; - goto assume_ok_easy; - } - else - s = (U8*)STRING(text_node); - - /* Currently we only get here when - - PL_rekind[OP(text_node)] == EXACT - - if this changes back then the macro for IS_TEXT and - friends need to change. */ - if (!UTF) { - ST.c2 = ST.c1 = *s; - if (IS_TEXTF(text_node)) - ST.c2 = PL_fold[ST.c1]; - else if (IS_TEXTFL(text_node)) - ST.c2 = PL_fold_locale[ST.c1]; - } - else { /* UTF */ - if (IS_TEXTF(text_node)) { - STRLEN ulen1, ulen2; - U8 tmpbuf1[UTF8_MAXBYTES_CASE+1]; - U8 tmpbuf2[UTF8_MAXBYTES_CASE+1]; - - to_utf8_lower((U8*)s, tmpbuf1, &ulen1); - to_utf8_upper((U8*)s, tmpbuf2, &ulen2); -#ifdef EBCDIC - ST.c1 = utf8n_to_uvchr(tmpbuf1, UTF8_MAXLEN, 0, - ckWARN(WARN_UTF8) ? - 0 : UTF8_ALLOW_ANY); - ST.c2 = utf8n_to_uvchr(tmpbuf2, UTF8_MAXLEN, 0, - ckWARN(WARN_UTF8) ? - 0 : UTF8_ALLOW_ANY); -#else - ST.c1 = utf8n_to_uvuni(tmpbuf1, UTF8_MAXBYTES, 0, - uniflags); - ST.c2 = utf8n_to_uvuni(tmpbuf2, UTF8_MAXBYTES, 0, - uniflags); -#endif - } - else { - ST.c2 = ST.c1 = utf8n_to_uvchr(s, UTF8_MAXBYTES, 0, - uniflags); - } - } - } - } - else - ST.c1 = ST.c2 = CHRTEST_VOID; - assume_ok_easy: - - ST.A = scan; - ST.B = next; - PL_reginput = locinput; - if (minmod) { - minmod = 0; - if (ST.min && regrepeat(rex, ST.A, ST.min, depth) < ST.min) - sayNO; - ST.count = ST.min; - locinput = PL_reginput; - REGCP_SET(ST.cp); - if (ST.c1 == CHRTEST_VOID) - goto curly_try_B_min; - - ST.oldloc = locinput; - - /* set ST.maxpos to the furthest point along the - * string that could possibly match */ - if (ST.max == REG_INFTY) { - ST.maxpos = PL_regeol - 1; - if (do_utf8) - while (UTF8_IS_CONTINUATION(*(U8*)ST.maxpos)) - ST.maxpos--; - } - else if (do_utf8) { - int m = ST.max - ST.min; - for (ST.maxpos = locinput; - m >0 && ST.maxpos + UTF8SKIP(ST.maxpos) <= PL_regeol; m--) - ST.maxpos += UTF8SKIP(ST.maxpos); - } - else { - ST.maxpos = locinput + ST.max - ST.min; - if (ST.maxpos >= PL_regeol) - ST.maxpos = PL_regeol - 1; - } - goto curly_try_B_min_known; - - } - else { - ST.count = regrepeat(rex, ST.A, ST.max, depth); - locinput = PL_reginput; - if (ST.count < ST.min) - sayNO; - if ((ST.count > ST.min) - && (PL_regkind[OP(ST.B)] == EOL) && (OP(ST.B) != MEOL)) - { - /* A{m,n} must come at the end of the string, there's - * no point in backing off ... */ - ST.min = ST.count; - /* ...except that $ and \Z can match before *and* after - newline at the end. Consider "\n\n" =~ /\n+\Z\n/. - We may back off by one in this case. */ - if (UCHARAT(PL_reginput - 1) == '\n' && OP(ST.B) != EOS) - ST.min--; - } - REGCP_SET(ST.cp); - goto curly_try_B_max; - } - /* NOTREACHED */ - - - case CURLY_B_min_known_fail: - /* failed to find B in a non-greedy match where c1,c2 valid */ - if (ST.paren && ST.count) - PL_regoffs[ST.paren].end = -1; - - PL_reginput = locinput; /* Could be reset... */ - REGCP_UNWIND(ST.cp); - /* Couldn't or didn't -- move forward. */ - ST.oldloc = locinput; - if (do_utf8) - locinput += UTF8SKIP(locinput); - else - locinput++; - ST.count++; - curly_try_B_min_known: - /* find the next place where 'B' could work, then call B */ - { - int n; - if (do_utf8) { - n = (ST.oldloc == locinput) ? 0 : 1; - if (ST.c1 == ST.c2) { - STRLEN len; - /* set n to utf8_distance(oldloc, locinput) */ - while (locinput <= ST.maxpos && - utf8n_to_uvchr((U8*)locinput, - UTF8_MAXBYTES, &len, - uniflags) != (UV)ST.c1) { - locinput += len; - n++; - } - } - else { - /* set n to utf8_distance(oldloc, locinput) */ - while (locinput <= ST.maxpos) { - STRLEN len; - const UV c = utf8n_to_uvchr((U8*)locinput, - UTF8_MAXBYTES, &len, - uniflags); - if (c == (UV)ST.c1 || c == (UV)ST.c2) - break; - locinput += len; - n++; - } - } - } - else { - if (ST.c1 == ST.c2) { - while (locinput <= ST.maxpos && - UCHARAT(locinput) != ST.c1) - locinput++; - } - else { - while (locinput <= ST.maxpos - && UCHARAT(locinput) != ST.c1 - && UCHARAT(locinput) != ST.c2) - locinput++; - } - n = locinput - ST.oldloc; - } - if (locinput > ST.maxpos) - sayNO; - /* PL_reginput == oldloc now */ - if (n) { - ST.count += n; - if (regrepeat(rex, ST.A, n, depth) < n) - sayNO; - } - PL_reginput = locinput; - CURLY_SETPAREN(ST.paren, ST.count); - if (cur_eval && cur_eval->u.eval.close_paren && - cur_eval->u.eval.close_paren == (U32)ST.paren) { - goto fake_end; - } - PUSH_STATE_GOTO(CURLY_B_min_known, ST.B); - } - /* NOTREACHED */ - - - case CURLY_B_min_fail: - /* failed to find B in a non-greedy match where c1,c2 invalid */ - if (ST.paren && ST.count) - PL_regoffs[ST.paren].end = -1; - - REGCP_UNWIND(ST.cp); - /* failed -- move forward one */ - PL_reginput = locinput; - if (regrepeat(rex, ST.A, 1, depth)) { - ST.count++; - locinput = PL_reginput; - if (ST.count <= ST.max || (ST.max == REG_INFTY && - ST.count > 0)) /* count overflow ? */ - { - curly_try_B_min: - CURLY_SETPAREN(ST.paren, ST.count); - if (cur_eval && cur_eval->u.eval.close_paren && - cur_eval->u.eval.close_paren == (U32)ST.paren) { - goto fake_end; - } - PUSH_STATE_GOTO(CURLY_B_min, ST.B); - } - } - sayNO; - /* NOTREACHED */ - - - curly_try_B_max: - /* a successful greedy match: now try to match B */ - if (cur_eval && cur_eval->u.eval.close_paren && - cur_eval->u.eval.close_paren == (U32)ST.paren) { - goto fake_end; - } - { - UV c = 0; - if (ST.c1 != CHRTEST_VOID) - c = do_utf8 ? utf8n_to_uvchr((U8*)PL_reginput, - UTF8_MAXBYTES, 0, uniflags) - : (UV) UCHARAT(PL_reginput); - /* If it could work, try it. */ - if (ST.c1 == CHRTEST_VOID || c == (UV)ST.c1 || c == (UV)ST.c2) { - CURLY_SETPAREN(ST.paren, ST.count); - PUSH_STATE_GOTO(CURLY_B_max, ST.B); - /* NOTREACHED */ - } - } - /* FALL THROUGH */ - case CURLY_B_max_fail: - /* failed to find B in a greedy match */ - if (ST.paren && ST.count) - PL_regoffs[ST.paren].end = -1; - - REGCP_UNWIND(ST.cp); - /* back up. */ - if (--ST.count < ST.min) - sayNO; - PL_reginput = locinput = HOPc(locinput, -1); - goto curly_try_B_max; - -#undef ST - - case END: - fake_end: - if (cur_eval) { - /* we've just finished A in /(??{A})B/; now continue with B */ - I32 tmpix; - st->u.eval.toggle_reg_flags - = cur_eval->u.eval.toggle_reg_flags; - PL_reg_flags ^= st->u.eval.toggle_reg_flags; - - st->u.eval.prev_rex = rex_sv; /* inner */ - SETREX(rex_sv,cur_eval->u.eval.prev_rex); - rex = (struct regexp *)SvANY(rex_sv); - rexi = RXi_GET(rex); - cur_curlyx = cur_eval->u.eval.prev_curlyx; - ReREFCNT_inc(rex_sv); - st->u.eval.cp = regcppush(0); /* Save *all* the positions. */ - - /* rex was changed so update the pointer in PL_reglastparen and PL_reglastcloseparen */ - PL_reglastparen = &rex->lastparen; - PL_reglastcloseparen = &rex->lastcloseparen; - - REGCP_SET(st->u.eval.lastcp); - PL_reginput = locinput; - - /* Restore parens of the outer rex without popping the - * savestack */ - tmpix = PL_savestack_ix; - PL_savestack_ix = cur_eval->u.eval.lastcp; - regcppop(rex); - PL_savestack_ix = tmpix; - - st->u.eval.prev_eval = cur_eval; - cur_eval = cur_eval->u.eval.prev_eval; - DEBUG_EXECUTE_r( - PerlIO_printf(Perl_debug_log, "%*s EVAL trying tail ... %"UVxf"\n", - REPORT_CODE_OFF+depth*2, "",PTR2UV(cur_eval));); - if ( nochange_depth ) - nochange_depth--; - - PUSH_YES_STATE_GOTO(EVAL_AB, - st->u.eval.prev_eval->u.eval.B); /* match B */ - } - - if (locinput < reginfo->till) { - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, - "%sMatch possible, but length=%ld is smaller than requested=%ld, failing!%s\n", - PL_colors[4], - (long)(locinput - PL_reg_starttry), - (long)(reginfo->till - PL_reg_starttry), - PL_colors[5])); - - sayNO_SILENT; /* Cannot match: too short. */ - } - PL_reginput = locinput; /* put where regtry can find it */ - sayYES; /* Success! */ - - case SUCCEED: /* successful SUSPEND/UNLESSM/IFMATCH/CURLYM */ - DEBUG_EXECUTE_r( - PerlIO_printf(Perl_debug_log, - "%*s %ssubpattern success...%s\n", - REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5])); - PL_reginput = locinput; /* put where regtry can find it */ - sayYES; /* Success! */ - -#undef ST -#define ST st->u.ifmatch - - case SUSPEND: /* (?>A) */ - ST.wanted = 1; - PL_reginput = locinput; - goto do_ifmatch; - - case UNLESSM: /* -ve lookaround: (?!A), or with flags, (?flags) { - char * const s = HOPBACKc(locinput, scan->flags); - if (!s) { - /* trivial fail */ - if (logical) { - logical = 0; - sw = 1 - (bool)ST.wanted; - } - else if (ST.wanted) - sayNO; - next = scan + ARG(scan); - if (next == scan) - next = NULL; - break; - } - PL_reginput = s; - } - else - PL_reginput = locinput; - - do_ifmatch: - ST.me = scan; - ST.logical = logical; - logical = 0; /* XXX: reset state of logical once it has been saved into ST */ - - /* execute body of (?...A) */ - PUSH_YES_STATE_GOTO(IFMATCH_A, NEXTOPER(NEXTOPER(scan))); - /* NOTREACHED */ - - case IFMATCH_A_fail: /* body of (?...A) failed */ - ST.wanted = !ST.wanted; - /* FALL THROUGH */ - - case IFMATCH_A: /* body of (?...A) succeeded */ - if (ST.logical) { - sw = (bool)ST.wanted; - } - else if (!ST.wanted) - sayNO; - - if (OP(ST.me) == SUSPEND) - locinput = PL_reginput; - else { - locinput = PL_reginput = st->locinput; - nextchr = UCHARAT(locinput); - } - scan = ST.me + ARG(ST.me); - if (scan == ST.me) - scan = NULL; - continue; /* execute B */ - -#undef ST - - case LONGJMP: - next = scan + ARG(scan); - if (next == scan) - next = NULL; - break; - case COMMIT: - reginfo->cutpoint = PL_regeol; - /* FALLTHROUGH */ - case PRUNE: - PL_reginput = locinput; - if (!scan->flags) - sv_yes_mark = sv_commit = MUTABLE_SV(rexi->data->data[ ARG( scan ) ]); - PUSH_STATE_GOTO(COMMIT_next,next); - /* NOTREACHED */ - case COMMIT_next_fail: - no_final = 1; - /* FALLTHROUGH */ - case OPFAIL: - sayNO; - /* NOTREACHED */ - -#define ST st->u.mark - case MARKPOINT: - ST.prev_mark = mark_state; - ST.mark_name = sv_commit = sv_yes_mark - = MUTABLE_SV(rexi->data->data[ ARG( scan ) ]); - mark_state = st; - ST.mark_loc = PL_reginput = locinput; - PUSH_YES_STATE_GOTO(MARKPOINT_next,next); - /* NOTREACHED */ - case MARKPOINT_next: - mark_state = ST.prev_mark; - sayYES; - /* NOTREACHED */ - case MARKPOINT_next_fail: - if (popmark && sv_eq(ST.mark_name,popmark)) - { - if (ST.mark_loc > startpoint) - reginfo->cutpoint = HOPBACKc(ST.mark_loc, 1); - popmark = NULL; /* we found our mark */ - sv_commit = ST.mark_name; - - DEBUG_EXECUTE_r({ - PerlIO_printf(Perl_debug_log, - "%*s %ssetting cutpoint to mark:%"SVf"...%s\n", - REPORT_CODE_OFF+depth*2, "", - PL_colors[4], SVfARG(sv_commit), PL_colors[5]); - }); - } - mark_state = ST.prev_mark; - sv_yes_mark = mark_state ? - mark_state->u.mark.mark_name : NULL; - sayNO; - /* NOTREACHED */ - case SKIP: - PL_reginput = locinput; - if (scan->flags) { - /* (*SKIP) : if we fail we cut here*/ - ST.mark_name = NULL; - ST.mark_loc = locinput; - PUSH_STATE_GOTO(SKIP_next,next); - } else { - /* (*SKIP:NAME) : if there is a (*MARK:NAME) fail where it was, - otherwise do nothing. Meaning we need to scan - */ - regmatch_state *cur = mark_state; - SV *find = MUTABLE_SV(rexi->data->data[ ARG( scan ) ]); - - while (cur) { - if ( sv_eq( cur->u.mark.mark_name, - find ) ) - { - ST.mark_name = find; - PUSH_STATE_GOTO( SKIP_next, next ); - } - cur = cur->u.mark.prev_mark; - } - } - /* Didn't find our (*MARK:NAME) so ignore this (*SKIP:NAME) */ - break; - case SKIP_next_fail: - if (ST.mark_name) { - /* (*CUT:NAME) - Set up to search for the name as we - collapse the stack*/ - popmark = ST.mark_name; - } else { - /* (*CUT) - No name, we cut here.*/ - if (ST.mark_loc > startpoint) - reginfo->cutpoint = HOPBACKc(ST.mark_loc, 1); - /* but we set sv_commit to latest mark_name if there - is one so they can test to see how things lead to this - cut */ - if (mark_state) - sv_commit=mark_state->u.mark.mark_name; - } - no_final = 1; - sayNO; - /* NOTREACHED */ -#undef ST - case FOLDCHAR: - n = ARG(scan); - if ( n == (U32)what_len_TRICKYFOLD(locinput,do_utf8,ln) ) { - locinput += ln; - } else if ( 0xDF == n && !do_utf8 && !UTF ) { - sayNO; - } else { - U8 folded[UTF8_MAXBYTES_CASE+1]; - STRLEN foldlen; - const char * const l = locinput; - char *e = PL_regeol; - to_uni_fold(n, folded, &foldlen); - - if (ibcmp_utf8((const char*) folded, 0, foldlen, 1, - l, &e, 0, do_utf8)) { - sayNO; - } - locinput = e; - } - nextchr = UCHARAT(locinput); - break; - case LNBREAK: - if ((n=is_LNBREAK(locinput,do_utf8))) { - locinput += n; - nextchr = UCHARAT(locinput); - } else - sayNO; - break; - -#define CASE_CLASS(nAmE) \ - case nAmE: \ - if ((n=is_##nAmE(locinput,do_utf8))) { \ - locinput += n; \ - nextchr = UCHARAT(locinput); \ - } else \ - sayNO; \ - break; \ - case N##nAmE: \ - if ((n=is_##nAmE(locinput,do_utf8))) { \ - sayNO; \ - } else { \ - locinput += UTF8SKIP(locinput); \ - nextchr = UCHARAT(locinput); \ - } \ - break - - CASE_CLASS(VERTWS); - CASE_CLASS(HORIZWS); -#undef CASE_CLASS - - default: - PerlIO_printf(Perl_error_log, "%"UVxf" %d\n", - PTR2UV(scan), OP(scan)); - Perl_croak(aTHX_ "regexp memory corruption"); - - } /* end switch */ - - /* switch break jumps here */ - scan = next; /* prepare to execute the next op and ... */ - continue; /* ... jump back to the top, reusing st */ - /* NOTREACHED */ - - push_yes_state: - /* push a state that backtracks on success */ - st->u.yes.prev_yes_state = yes_state; - yes_state = st; - /* FALL THROUGH */ - push_state: - /* push a new regex state, then continue at scan */ - { - regmatch_state *newst; - - DEBUG_STACK_r({ - regmatch_state *cur = st; - regmatch_state *curyes = yes_state; - int curd = depth; - regmatch_slab *slab = PL_regmatch_slab; - for (;curd > -1;cur--,curd--) { - if (cur < SLAB_FIRST(slab)) { - slab = slab->prev; - cur = SLAB_LAST(slab); - } - PerlIO_printf(Perl_error_log, "%*s#%-3d %-10s %s\n", - REPORT_CODE_OFF + 2 + depth * 2,"", - curd, PL_reg_name[cur->resume_state], - (curyes == cur) ? "yes" : "" - ); - if (curyes == cur) - curyes = cur->u.yes.prev_yes_state; - } - } else - DEBUG_STATE_pp("push") - ); - depth++; - st->locinput = locinput; - newst = st+1; - if (newst > SLAB_LAST(PL_regmatch_slab)) - newst = S_push_slab(aTHX); - PL_regmatch_state = newst; - - locinput = PL_reginput; - nextchr = UCHARAT(locinput); - st = newst; - continue; - /* NOTREACHED */ - } - } - - /* - * We get here only if there's trouble -- normally "case END" is - * the terminating point. - */ - Perl_croak(aTHX_ "corrupted regexp pointers"); - /*NOTREACHED*/ - sayNO; - -yes: - if (yes_state) { - /* we have successfully completed a subexpression, but we must now - * pop to the state marked by yes_state and continue from there */ - assert(st != yes_state); -#ifdef DEBUGGING - while (st != yes_state) { - st--; - if (st < SLAB_FIRST(PL_regmatch_slab)) { - PL_regmatch_slab = PL_regmatch_slab->prev; - st = SLAB_LAST(PL_regmatch_slab); - } - DEBUG_STATE_r({ - if (no_final) { - DEBUG_STATE_pp("pop (no final)"); - } else { - DEBUG_STATE_pp("pop (yes)"); - } - }); - depth--; - } -#else - while (yes_state < SLAB_FIRST(PL_regmatch_slab) - || yes_state > SLAB_LAST(PL_regmatch_slab)) - { - /* not in this slab, pop slab */ - depth -= (st - SLAB_FIRST(PL_regmatch_slab) + 1); - PL_regmatch_slab = PL_regmatch_slab->prev; - st = SLAB_LAST(PL_regmatch_slab); - } - depth -= (st - yes_state); -#endif - st = yes_state; - yes_state = st->u.yes.prev_yes_state; - PL_regmatch_state = st; - - if (no_final) { - locinput= st->locinput; - nextchr = UCHARAT(locinput); - } - state_num = st->resume_state + no_final; - goto reenter_switch; - } - - DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch successful!%s\n", - PL_colors[4], PL_colors[5])); - - if (PL_reg_eval_set) { - /* each successfully executed (?{...}) block does the equivalent of - * local $^R = do {...} - * When popping the save stack, all these locals would be undone; - * bypass this by setting the outermost saved $^R to the latest - * value */ - if (oreplsv != GvSV(PL_replgv)) - sv_setsv(oreplsv, GvSV(PL_replgv)); - } - result = 1; - goto final_exit; - -no: - DEBUG_EXECUTE_r( - PerlIO_printf(Perl_debug_log, - "%*s %sfailed...%s\n", - REPORT_CODE_OFF+depth*2, "", - PL_colors[4], PL_colors[5]) - ); - -no_silent: - if (no_final) { - if (yes_state) { - goto yes; - } else { - goto final_exit; - } - } - if (depth) { - /* there's a previous state to backtrack to */ - st--; - if (st < SLAB_FIRST(PL_regmatch_slab)) { - PL_regmatch_slab = PL_regmatch_slab->prev; - st = SLAB_LAST(PL_regmatch_slab); - } - PL_regmatch_state = st; - locinput= st->locinput; - nextchr = UCHARAT(locinput); - - DEBUG_STATE_pp("pop"); - depth--; - if (yes_state == st) - yes_state = st->u.yes.prev_yes_state; - - state_num = st->resume_state + 1; /* failure = success + 1 */ - goto reenter_switch; - } - result = 0; - - final_exit: - if (rex->intflags & PREGf_VERBARG_SEEN) { - SV *sv_err = get_sv("REGERROR", 1); - SV *sv_mrk = get_sv("REGMARK", 1); - if (result) { - sv_commit = &PL_sv_no; - if (!sv_yes_mark) - sv_yes_mark = &PL_sv_yes; - } else { - if (!sv_commit) - sv_commit = &PL_sv_yes; - sv_yes_mark = &PL_sv_no; - } - sv_setsv(sv_err, sv_commit); - sv_setsv(sv_mrk, sv_yes_mark); - } - - /* clean up; in particular, free all slabs above current one */ - LEAVE_SCOPE(oldsave); - - return result; -} - -/* - - regrepeat - repeatedly match something simple, report how many - */ -/* - * [This routine now assumes that it will only match on things of length 1. - * That was true before, but now we assume scan - reginput is the count, - * rather than incrementing count on every character. [Er, except utf8.]] - */ -STATIC I32 -S_regrepeat(pTHX_ const regexp *prog, const regnode *p, I32 max, int depth) -{ - dVAR; - register char *scan; - register I32 c; - register char *loceol = PL_regeol; - register I32 hardcount = 0; - register bool do_utf8 = PL_reg_match_utf8; -#ifndef DEBUGGING - PERL_UNUSED_ARG(depth); -#endif - - PERL_ARGS_ASSERT_REGREPEAT; - - scan = PL_reginput; - if (max == REG_INFTY) - max = I32_MAX; - else if (max < loceol - scan) - loceol = scan + max; - switch (OP(p)) { - case REG_ANY: - if (do_utf8) { - loceol = PL_regeol; - while (scan < loceol && hardcount < max && *scan != '\n') { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && *scan != '\n') - scan++; - } - break; - case SANY: - if (do_utf8) { - loceol = PL_regeol; - while (scan < loceol && hardcount < max) { - scan += UTF8SKIP(scan); - hardcount++; - } - } - else - scan = loceol; - break; - case CANY: - scan = loceol; - break; - case EXACT: /* length of string is 1 */ - c = (U8)*STRING(p); - while (scan < loceol && UCHARAT(scan) == c) - scan++; - break; - case EXACTF: /* length of string is 1 */ - c = (U8)*STRING(p); - while (scan < loceol && - (UCHARAT(scan) == c || UCHARAT(scan) == PL_fold[c])) - scan++; - break; - case EXACTFL: /* length of string is 1 */ - PL_reg_flags |= RF_tainted; - c = (U8)*STRING(p); - while (scan < loceol && - (UCHARAT(scan) == c || UCHARAT(scan) == PL_fold_locale[c])) - scan++; - break; - case ANYOF: - if (do_utf8) { - loceol = PL_regeol; - while (hardcount < max && scan < loceol && - reginclass(prog, p, (U8*)scan, 0, do_utf8)) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && REGINCLASS(prog, p, (U8*)scan)) - scan++; - } - break; - case ALNUM: - if (do_utf8) { - loceol = PL_regeol; - LOAD_UTF8_CHARCLASS_ALNUM(); - while (hardcount < max && scan < loceol && - swash_fetch(PL_utf8_alnum, (U8*)scan, do_utf8)) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && isALNUM(*scan)) - scan++; - } - break; - case ALNUML: - PL_reg_flags |= RF_tainted; - if (do_utf8) { - loceol = PL_regeol; - while (hardcount < max && scan < loceol && - isALNUM_LC_utf8((U8*)scan)) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && isALNUM_LC(*scan)) - scan++; - } - break; - case NALNUM: - if (do_utf8) { - loceol = PL_regeol; - LOAD_UTF8_CHARCLASS_ALNUM(); - while (hardcount < max && scan < loceol && - !swash_fetch(PL_utf8_alnum, (U8*)scan, do_utf8)) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && !isALNUM(*scan)) - scan++; - } - break; - case NALNUML: - PL_reg_flags |= RF_tainted; - if (do_utf8) { - loceol = PL_regeol; - while (hardcount < max && scan < loceol && - !isALNUM_LC_utf8((U8*)scan)) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && !isALNUM_LC(*scan)) - scan++; - } - break; - case SPACE: - if (do_utf8) { - loceol = PL_regeol; - LOAD_UTF8_CHARCLASS_SPACE(); - while (hardcount < max && scan < loceol && - (*scan == ' ' || - swash_fetch(PL_utf8_space,(U8*)scan, do_utf8))) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && isSPACE(*scan)) - scan++; - } - break; - case SPACEL: - PL_reg_flags |= RF_tainted; - if (do_utf8) { - loceol = PL_regeol; - while (hardcount < max && scan < loceol && - (*scan == ' ' || isSPACE_LC_utf8((U8*)scan))) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && isSPACE_LC(*scan)) - scan++; - } - break; - case NSPACE: - if (do_utf8) { - loceol = PL_regeol; - LOAD_UTF8_CHARCLASS_SPACE(); - while (hardcount < max && scan < loceol && - !(*scan == ' ' || - swash_fetch(PL_utf8_space,(U8*)scan, do_utf8))) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && !isSPACE(*scan)) - scan++; - } - break; - case NSPACEL: - PL_reg_flags |= RF_tainted; - if (do_utf8) { - loceol = PL_regeol; - while (hardcount < max && scan < loceol && - !(*scan == ' ' || isSPACE_LC_utf8((U8*)scan))) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && !isSPACE_LC(*scan)) - scan++; - } - break; - case DIGIT: - if (do_utf8) { - loceol = PL_regeol; - LOAD_UTF8_CHARCLASS_DIGIT(); - while (hardcount < max && scan < loceol && - swash_fetch(PL_utf8_digit, (U8*)scan, do_utf8)) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && isDIGIT(*scan)) - scan++; - } - break; - case NDIGIT: - if (do_utf8) { - loceol = PL_regeol; - LOAD_UTF8_CHARCLASS_DIGIT(); - while (hardcount < max && scan < loceol && - !swash_fetch(PL_utf8_digit, (U8*)scan, do_utf8)) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && !isDIGIT(*scan)) - scan++; - } - case LNBREAK: - if (do_utf8) { - loceol = PL_regeol; - while (hardcount < max && scan < loceol && (c=is_LNBREAK_utf8(scan))) { - scan += c; - hardcount++; - } - } else { - /* - LNBREAK can match two latin chars, which is ok, - because we have a null terminated string, but we - have to use hardcount in this situation - */ - while (scan < loceol && (c=is_LNBREAK_latin1(scan))) { - scan+=c; - hardcount++; - } - } - break; - case HORIZWS: - if (do_utf8) { - loceol = PL_regeol; - while (hardcount < max && scan < loceol && (c=is_HORIZWS_utf8(scan))) { - scan += c; - hardcount++; - } - } else { - while (scan < loceol && is_HORIZWS_latin1(scan)) - scan++; - } - break; - case NHORIZWS: - if (do_utf8) { - loceol = PL_regeol; - while (hardcount < max && scan < loceol && !is_HORIZWS_utf8(scan)) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && !is_HORIZWS_latin1(scan)) - scan++; - - } - break; - case VERTWS: - if (do_utf8) { - loceol = PL_regeol; - while (hardcount < max && scan < loceol && (c=is_VERTWS_utf8(scan))) { - scan += c; - hardcount++; - } - } else { - while (scan < loceol && is_VERTWS_latin1(scan)) - scan++; - - } - break; - case NVERTWS: - if (do_utf8) { - loceol = PL_regeol; - while (hardcount < max && scan < loceol && !is_VERTWS_utf8(scan)) { - scan += UTF8SKIP(scan); - hardcount++; - } - } else { - while (scan < loceol && !is_VERTWS_latin1(scan)) - scan++; - - } - break; - - default: /* Called on something of 0 width. */ - break; /* So match right here or not at all. */ - } - - if (hardcount) - c = hardcount; - else - c = scan - PL_reginput; - PL_reginput = scan; - - DEBUG_r({ - GET_RE_DEBUG_FLAGS_DECL; - DEBUG_EXECUTE_r({ - SV * const prop = sv_newmortal(); - regprop(prog, prop, p); - PerlIO_printf(Perl_debug_log, - "%*s %s can match %"IVdf" times out of %"IVdf"...\n", - REPORT_CODE_OFF + depth*2, "", SvPVX_const(prop),(IV)c,(IV)max); - }); - }); - - return(c); -} - - -#if !defined(PERL_IN_XSUB_RE) || defined(PLUGGABLE_RE_EXTENSION) -/* -- regclass_swash - prepare the utf8 swash -*/ - -SV * -Perl_regclass_swash(pTHX_ const regexp *prog, register const regnode* node, bool doinit, SV** listsvp, SV **altsvp) -{ - dVAR; - SV *sw = NULL; - SV *si = NULL; - SV *alt = NULL; - RXi_GET_DECL(prog,progi); - const struct reg_data * const data = prog ? progi->data : NULL; - - PERL_ARGS_ASSERT_REGCLASS_SWASH; - - if (data && data->count) { - const U32 n = ARG(node); - - if (data->what[n] == 's') { - SV * const rv = MUTABLE_SV(data->data[n]); - AV * const av = MUTABLE_AV(SvRV(rv)); - SV **const ary = AvARRAY(av); - SV **a, **b; - - /* See the end of regcomp.c:S_regclass() for - * documentation of these array elements. */ - - si = *ary; - a = SvROK(ary[1]) ? &ary[1] : NULL; - b = SvTYPE(ary[2]) == SVt_PVAV ? &ary[2] : NULL; - - if (a) - sw = *a; - else if (si && doinit) { - sw = swash_init("utf8", "", si, 1, 0); - (void)av_store(av, 1, sw); - } - if (b) - alt = *b; - } - } - - if (listsvp) - *listsvp = si; - if (altsvp) - *altsvp = alt; - - return sw; -} -#endif - -/* - - reginclass - determine if a character falls into a character class - - The n is the ANYOF regnode, the p is the target string, lenp - is pointer to the maximum length of how far to go in the p - (if the lenp is zero, UTF8SKIP(p) is used), - do_utf8 tells whether the target string is in UTF-8. - - */ - -STATIC bool -S_reginclass(pTHX_ const regexp *prog, register const regnode *n, register const U8* p, STRLEN* lenp, register bool do_utf8) -{ - dVAR; - const char flags = ANYOF_FLAGS(n); - bool match = FALSE; - UV c = *p; - STRLEN len = 0; - STRLEN plen; - - PERL_ARGS_ASSERT_REGINCLASS; - - if (do_utf8 && !UTF8_IS_INVARIANT(c)) { - c = utf8n_to_uvchr(p, UTF8_MAXBYTES, &len, - (UTF8_ALLOW_DEFAULT & UTF8_ALLOW_ANYUV) - | UTF8_ALLOW_FFFF | UTF8_CHECK_ONLY); - /* see [perl #37836] for UTF8_ALLOW_ANYUV; [perl #38293] for - * UTF8_ALLOW_FFFF */ - if (len == (STRLEN)-1) - Perl_croak(aTHX_ "Malformed UTF-8 character (fatal)"); - } - - plen = lenp ? *lenp : UNISKIP(NATIVE_TO_UNI(c)); - if (do_utf8 || (flags & ANYOF_UNICODE)) { - if (lenp) - *lenp = 0; - if (do_utf8 && !ANYOF_RUNTIME(n)) { - if (len != (STRLEN)-1 && c < 256 && ANYOF_BITMAP_TEST(n, c)) - match = TRUE; - } - if (!match && do_utf8 && (flags & ANYOF_UNICODE_ALL) && c >= 256) - match = TRUE; - if (!match) { - AV *av; - SV * const sw = regclass_swash(prog, n, TRUE, 0, (SV**)&av); - - if (sw) { - U8 * utf8_p; - if (do_utf8) { - utf8_p = (U8 *) p; - } else { - STRLEN len = 1; - utf8_p = bytes_to_utf8(p, &len); - } - if (swash_fetch(sw, utf8_p, 1)) - match = TRUE; - else if (flags & ANYOF_FOLD) { - if (!match && lenp && av) { - I32 i; - for (i = 0; i <= av_len(av); i++) { - SV* const sv = *av_fetch(av, i, FALSE); - STRLEN len; - const char * const s = SvPV_const(sv, len); - if (len <= plen && memEQ(s, (char*)utf8_p, len)) { - *lenp = len; - match = TRUE; - break; - } - } - } - if (!match) { - U8 tmpbuf[UTF8_MAXBYTES_CASE+1]; - - STRLEN tmplen; - to_utf8_fold(utf8_p, tmpbuf, &tmplen); - if (swash_fetch(sw, tmpbuf, 1)) - match = TRUE; - } - } - - /* If we allocated a string above, free it */ - if (! do_utf8) Safefree(utf8_p); - } - } - if (match && lenp && *lenp == 0) - *lenp = UNISKIP(NATIVE_TO_UNI(c)); - } - if (!match && c < 256) { - if (ANYOF_BITMAP_TEST(n, c)) - match = TRUE; - else if (flags & ANYOF_FOLD) { - U8 f; - - if (flags & ANYOF_LOCALE) { - PL_reg_flags |= RF_tainted; - f = PL_fold_locale[c]; - } - else - f = PL_fold[c]; - if (f != c && ANYOF_BITMAP_TEST(n, f)) - match = TRUE; - } - - if (!match && (flags & ANYOF_CLASS)) { - PL_reg_flags |= RF_tainted; - if ( - (ANYOF_CLASS_TEST(n, ANYOF_ALNUM) && isALNUM_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NALNUM) && !isALNUM_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_SPACE) && isSPACE_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NSPACE) && !isSPACE_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_DIGIT) && isDIGIT_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NDIGIT) && !isDIGIT_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_ALNUMC) && isALNUMC_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NALNUMC) && !isALNUMC_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_ALPHA) && isALPHA_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NALPHA) && !isALPHA_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_ASCII) && isASCII(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NASCII) && !isASCII(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_CNTRL) && isCNTRL_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NCNTRL) && !isCNTRL_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_GRAPH) && isGRAPH_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NGRAPH) && !isGRAPH_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_LOWER) && isLOWER_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NLOWER) && !isLOWER_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_PRINT) && isPRINT_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NPRINT) && !isPRINT_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_PUNCT) && isPUNCT_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NPUNCT) && !isPUNCT_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_UPPER) && isUPPER_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NUPPER) && !isUPPER_LC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_XDIGIT) && isXDIGIT(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NXDIGIT) && !isXDIGIT(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_PSXSPC) && isPSXSPC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NPSXSPC) && !isPSXSPC(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_BLANK) && isBLANK(c)) || - (ANYOF_CLASS_TEST(n, ANYOF_NBLANK) && !isBLANK(c)) - ) /* How's that for a conditional? */ - { - match = TRUE; - } - } - } - - return (flags & ANYOF_INVERT) ? !match : match; -} - -STATIC U8 * -S_reghop3(U8 *s, I32 off, const U8* lim) -{ - dVAR; - - PERL_ARGS_ASSERT_REGHOP3; - - if (off >= 0) { - while (off-- && s < lim) { - /* XXX could check well-formedness here */ - s += UTF8SKIP(s); - } - } - else { - while (off++ && s > lim) { - s--; - if (UTF8_IS_CONTINUED(*s)) { - while (s > lim && UTF8_IS_CONTINUATION(*s)) - s--; - } - /* XXX could check well-formedness here */ - } - } - return s; -} - -#ifdef XXX_dmq -/* there are a bunch of places where we use two reghop3's that should - be replaced with this routine. but since thats not done yet - we ifdef it out - dmq -*/ -STATIC U8 * -S_reghop4(U8 *s, I32 off, const U8* llim, const U8* rlim) -{ - dVAR; - - PERL_ARGS_ASSERT_REGHOP4; - - if (off >= 0) { - while (off-- && s < rlim) { - /* XXX could check well-formedness here */ - s += UTF8SKIP(s); - } - } - else { - while (off++ && s > llim) { - s--; - if (UTF8_IS_CONTINUED(*s)) { - while (s > llim && UTF8_IS_CONTINUATION(*s)) - s--; - } - /* XXX could check well-formedness here */ - } - } - return s; -} -#endif - -STATIC U8 * -S_reghopmaybe3(U8* s, I32 off, const U8* lim) -{ - dVAR; - - PERL_ARGS_ASSERT_REGHOPMAYBE3; - - if (off >= 0) { - while (off-- && s < lim) { - /* XXX could check well-formedness here */ - s += UTF8SKIP(s); - } - if (off >= 0) - return NULL; - } - else { - while (off++ && s > lim) { - s--; - if (UTF8_IS_CONTINUED(*s)) { - while (s > lim && UTF8_IS_CONTINUATION(*s)) - s--; - } - /* XXX could check well-formedness here */ - } - if (off <= 0) - return NULL; - } - return s; -} - -static void -restore_pos(pTHX_ void *arg) -{ - dVAR; - regexp * const rex = (regexp *)arg; - if (PL_reg_eval_set) { - if (PL_reg_oldsaved) { - rex->subbeg = PL_reg_oldsaved; - rex->sublen = PL_reg_oldsavedlen; -#ifdef PERL_OLD_COPY_ON_WRITE - rex->saved_copy = PL_nrs; -#endif - RXp_MATCH_COPIED_on(rex); - } - PL_reg_magic->mg_len = PL_reg_oldpos; - PL_reg_eval_set = 0; - PL_curpm = PL_reg_oldcurpm; - } -} - -STATIC void -S_to_utf8_substr(pTHX_ register regexp *prog) -{ - int i = 1; - - PERL_ARGS_ASSERT_TO_UTF8_SUBSTR; - - do { - if (prog->substrs->data[i].substr - && !prog->substrs->data[i].utf8_substr) { - SV* const sv = newSVsv(prog->substrs->data[i].substr); - prog->substrs->data[i].utf8_substr = sv; - sv_utf8_upgrade(sv); - if (SvVALID(prog->substrs->data[i].substr)) { - const U8 flags = BmFLAGS(prog->substrs->data[i].substr); - if (flags & FBMcf_TAIL) { - /* Trim the trailing \n that fbm_compile added last - time. */ - SvCUR_set(sv, SvCUR(sv) - 1); - /* Whilst this makes the SV technically "invalid" (as its - buffer is no longer followed by "\0") when fbm_compile() - adds the "\n" back, a "\0" is restored. */ - } - fbm_compile(sv, flags); - } - if (prog->substrs->data[i].substr == prog->check_substr) - prog->check_utf8 = sv; - } - } while (i--); -} - -STATIC void -S_to_byte_substr(pTHX_ register regexp *prog) -{ - dVAR; - int i = 1; - - PERL_ARGS_ASSERT_TO_BYTE_SUBSTR; - - do { - if (prog->substrs->data[i].utf8_substr - && !prog->substrs->data[i].substr) { - SV* sv = newSVsv(prog->substrs->data[i].utf8_substr); - if (sv_utf8_downgrade(sv, TRUE)) { - if (SvVALID(prog->substrs->data[i].utf8_substr)) { - const U8 flags - = BmFLAGS(prog->substrs->data[i].utf8_substr); - if (flags & FBMcf_TAIL) { - /* Trim the trailing \n that fbm_compile added last - time. */ - SvCUR_set(sv, SvCUR(sv) - 1); - } - fbm_compile(sv, flags); - } - } else { - SvREFCNT_dec(sv); - sv = &PL_sv_undef; - } - prog->substrs->data[i].substr = sv; - if (prog->substrs->data[i].utf8_substr == prog->check_utf8) - prog->check_substr = sv; - } - } while (i--); -} - -/* - * Local variables: - * c-indentation-style: bsd - * c-basic-offset: 4 - * indent-tabs-mode: t - * End: - * - * ex: set ts=8 sts=4 sw=4 noet: - */