X-Git-Url: http://git.vpit.fr/?p=perl%2Fmodules%2Fre-engine-Hooks.git;a=blobdiff_plain;f=src%2F5012005%2Fregexec.c;fp=src%2F5012005%2Fregexec.c;h=07b32aee576c241348855332e691c82500163598;hp=0000000000000000000000000000000000000000;hb=b7ffafef77eeffae7c120f6b8367b6813dffeeb9;hpb=c833cf32eaf3d6b7cfe3b73b976b361ae294bc9f diff --git a/src/5012005/regexec.c b/src/5012005/regexec.c new file mode 100644 index 0000000..07b32ae --- /dev/null +++ b/src/5012005/regexec.c @@ -0,0 +1,6291 @@ +/* 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) { + /* because of the goto we can not easily reuse the macros for bifurcating the + unicode/non-unicode match modes here like we do elsewhere - demerphq */ + if (do_utf8) { + if (s == startpos) + goto after_try_utf8; + while (1) { + if (regtry(®info, &s)) { + goto got_it; + } + after_try_utf8: + if (s > end) { + goto phooey; + } + if (prog->extflags & RXf_USE_INTUIT) { + s = re_intuit_start(rx, sv, s + UTF8SKIP(s), strend, flags, NULL); + if (!s) { + goto phooey; + } + } + else { + s += UTF8SKIP(s); + } + } + } /* end search for check string in unicode */ + else { + if (s == startpos) { + goto after_try_latin; + } + while (1) { + if (regtry(®info, &s)) { + goto got_it; + } + after_try_latin: + 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++; + } + } + } /* end search for check string in latin*/ + } /* end search for check string */ + else { /* search for newline */ + if (s > startpos) { + /*XXX: The s-- is almost definitely wrong here under unicode - demeprhq*/ + s--; + } + /* We can use a more efficient search as newlines are the same in unicode as they are in latin */ + while (s < end) { + if (*s++ == '\n') { /* don't need PL_utf8skip here */ + if (regtry(®info, &s)) + goto got_it; + } + } + } /* end search for newline */ + } /* end anchored/multiline check string search */ + 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: + */