X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=regcomp.c;h=76ae52376ece975123ef6e91208b52bdd320a3bd;hb=7894fbab1e479c2ce906aed9132b15a68bfa5d73;hp=9a7be67aad7ce184e229509edc3d50e5ee6f6264;hpb=79a0689e17f959bdb246dc37bbbbfeba4c2b3b56;p=p5sagit%2Fp5-mst-13.2.git diff --git a/regcomp.c b/regcomp.c index 9a7be67..76ae523 100644 --- a/regcomp.c +++ b/regcomp.c @@ -1,3 +1,10 @@ +/* regcomp.c + */ + +/* + * "A fair jaw-cracker dwarf-language must be." --Samwise Gamgee + */ + /* NOTE: this is derived from Henry Spencer's regexp code, and should not * confused with the original package (see point 3 below). Thanks, Henry! */ @@ -7,25 +14,37 @@ * blame Henry for some of the lack of readability. */ -/* $Header: regcomp.c,v 3.0.1.3 90/03/12 16:59:22 lwall Locked $ - * - * $Log: regcomp.c,v $ - * Revision 3.0.1.3 90/03/12 16:59:22 lwall - * patch13: pattern matches can now use \0 to mean \000 - * - * Revision 3.0.1.2 90/02/28 18:08:35 lwall - * patch9: /[\200-\377]/ didn't work on machines with signed chars - * - * Revision 3.0.1.1 89/11/11 04:51:04 lwall - * patch2: /[\000]/ didn't work - * - * Revision 3.0 89/10/18 15:22:29 lwall - * 3.0 baseline - * - */ +/* 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 +/* need to replace pregcomp et al, so enable that */ +# ifndef PERL_IN_XSUB_RE +# define PERL_IN_XSUB_RE +# endif +/* need access to debugger hooks */ +# ifndef DEBUGGING +# define DEBUGGING +# endif +#endif +#ifdef PERL_IN_XSUB_RE +/* We *really* need to overwrite these symbols: */ +# define Perl_pregcomp my_regcomp +# define Perl_regdump my_regdump +# define Perl_regprop my_regprop +/* *These* symbols are masked to allow static link. */ +# define Perl_pregfree my_regfree +# define Perl_regnext my_regnext +# define Perl_save_re_context my_save_re_context +# define Perl_reginitcolors my_reginitcolors +#endif + +/*SUPPRESS 112*/ /* - * regcomp and regexec -- regsub and regerror are not used in perl + * 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. @@ -47,20 +66,40 @@ * **** Alterations to Henry's code are... **** - **** Copyright (c) 1989, Larry Wall + **** Copyright (c) 1991-1999, Larry Wall **** - **** You may distribute under the terms of the GNU General Public License - **** as specified in the README file that comes with the perl 3.0 kit. + **** 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_REGCOMP_C #include "perl.h" -#include "INTERN.h" + +#ifndef PERL_IN_XSUB_RE +# include "INTERN.h" +#endif + +#define REG_COMP_C #include "regcomp.h" +#ifdef op +#undef op +#endif /* op */ + +#ifdef MSDOS +# if defined(BUGGY_MSC6) + /* MSC 6.00A breaks on op/regexp.t test 85 unless we turn this off */ + # pragma optimize("a",off) + /* But MSC 6.00A is happy with 'w', for aliases only across function calls*/ + # pragma optimize("w",on ) +# endif /* BUGGY_MSC6 */ +#endif /* MSDOS */ + #ifndef STATIC #define STATIC static #endif @@ -68,45 +107,652 @@ #define ISMULT1(c) ((c) == '*' || (c) == '+' || (c) == '?') #define ISMULT2(s) ((*s) == '*' || (*s) == '+' || (*s) == '?' || \ ((*s) == '{' && regcurly(s))) +#ifdef atarist +#define PERL_META "^$.[()|?+*\\" +#else #define META "^$.[()|?+*\\" +#endif +#ifdef SPSTART +#undef SPSTART /* dratted cpp namespace... */ +#endif /* * Flags to be passed up and down. */ -#define HASWIDTH 01 /* Known never to match null string. */ -#define SIMPLE 02 /* Simple enough to be STAR/PLUS operand. */ -#define SPSTART 04 /* Starts with * or +. */ #define WORST 0 /* Worst case. */ +#define HASWIDTH 0x1 /* Known to match non-null strings. */ +#define SIMPLE 0x2 /* Simple enough to be STAR/PLUS operand. */ +#define SPSTART 0x4 /* Starts with * or +. */ +#define TRYAGAIN 0x8 /* Weeded out a declaration. */ /* - * Global work variables for regcomp(). + * Forward declarations for pregcomp()'s friends. */ -static char *regprecomp; /* uncompiled string. */ -static char *regparse; /* Input-scan pointer. */ -static char *regxend; /* End of input for compile */ -static int regnpar; /* () count. */ -static char *regcode; /* Code-emit pointer; ®dummy = don't. */ -static long regsize; /* Code size. */ -static int regfold; -static int regsawbracket; /* Did we do {d,d} trick? */ -/* - * Forward declarations for regcomp()'s friends. - */ -STATIC int regcurly(); -STATIC char *reg(); -STATIC char *regbranch(); -STATIC char *regpiece(); -STATIC char *regatom(); -STATIC char *regclass(); -STATIC char *regnode(); -STATIC void regc(); -STATIC void reginsert(); -STATIC void regtail(); -STATIC void regoptail(); +static scan_data_t zero_scan_data = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0 }; + +#define SF_BEFORE_EOL (SF_BEFORE_SEOL|SF_BEFORE_MEOL) +#define SF_BEFORE_SEOL 0x1 +#define SF_BEFORE_MEOL 0x2 +#define SF_FIX_BEFORE_EOL (SF_FIX_BEFORE_SEOL|SF_FIX_BEFORE_MEOL) +#define SF_FL_BEFORE_EOL (SF_FL_BEFORE_SEOL|SF_FL_BEFORE_MEOL) + +#ifdef NO_UNARY_PLUS +# define SF_FIX_SHIFT_EOL (0+2) +# define SF_FL_SHIFT_EOL (0+4) +#else +# define SF_FIX_SHIFT_EOL (+2) +# define SF_FL_SHIFT_EOL (+4) +#endif + +#define SF_FIX_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FIX_SHIFT_EOL) +#define SF_FIX_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FIX_SHIFT_EOL) + +#define SF_FL_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FL_SHIFT_EOL) +#define SF_FL_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FL_SHIFT_EOL) /* 0x20 */ +#define SF_IS_INF 0x40 +#define SF_HAS_PAR 0x80 +#define SF_IN_PAR 0x100 +#define SF_HAS_EVAL 0x200 +#define SCF_DO_SUBSTR 0x400 + +#define RF_utf8 8 +#define UTF (PL_reg_flags & RF_utf8) +#define LOC (PL_regflags & PMf_LOCALE) +#define FOLD (PL_regflags & PMf_FOLD) + +#define CHR_SVLEN(sv) (UTF ? sv_len_utf8(sv) : SvCUR(sv)) +#define CHR_DIST(a,b) (UTF ? utf8_distance(a,b) : a - b) + +STATIC void +S_clear_re(pTHX_ void *r) +{ + ReREFCNT_dec((regexp *)r); +} + +STATIC void +S_scan_commit(pTHX_ scan_data_t *data) +{ + dTHR; + STRLEN l = CHR_SVLEN(data->last_found); + STRLEN old_l = CHR_SVLEN(*data->longest); + + if ((l >= old_l) && ((l > old_l) || (data->flags & SF_BEFORE_EOL))) { + sv_setsv(*data->longest, data->last_found); + if (*data->longest == data->longest_fixed) { + data->offset_fixed = l ? data->last_start_min : data->pos_min; + if (data->flags & SF_BEFORE_EOL) + data->flags + |= ((data->flags & SF_BEFORE_EOL) << SF_FIX_SHIFT_EOL); + else + data->flags &= ~SF_FIX_BEFORE_EOL; + } + else { + data->offset_float_min = l ? data->last_start_min : data->pos_min; + data->offset_float_max = (l + ? data->last_start_max + : data->pos_min + data->pos_delta); + if (data->flags & SF_BEFORE_EOL) + data->flags + |= ((data->flags & SF_BEFORE_EOL) << SF_FL_SHIFT_EOL); + else + data->flags &= ~SF_FL_BEFORE_EOL; + } + } + SvCUR_set(data->last_found, 0); + data->last_end = -1; + data->flags &= ~SF_BEFORE_EOL; +} + +/* Stops at toplevel WHILEM as well as at `last'. At end *scanp is set + to the position after last scanned or to NULL. */ + +STATIC I32 +S_study_chunk(pTHX_ regnode **scanp, I32 *deltap, regnode *last, scan_data_t *data, U32 flags) + /* scanp: Start here (read-write). */ + /* deltap: Write maxlen-minlen here. */ + /* last: Stop before this one. */ +{ + dTHR; + I32 min = 0, pars = 0, code; + regnode *scan = *scanp, *next; + I32 delta = 0; + int is_inf = (flags & SCF_DO_SUBSTR) && (data->flags & SF_IS_INF); + int is_inf_internal = 0; /* The studied chunk is infinite */ + I32 is_par = OP(scan) == OPEN ? ARG(scan) : 0; + scan_data_t data_fake; + + while (scan && OP(scan) != END && scan < last) { + /* Peephole optimizer: */ + + if (PL_regkind[(U8)OP(scan)] == EXACT) { + regnode *n = regnext(scan); + U32 stringok = 1; +#ifdef DEBUGGING + regnode *stop = scan; +#endif + + next = scan + (*OPERAND(scan) + 2 - 1)/sizeof(regnode) + 2; + /* Skip NOTHING, merge EXACT*. */ + while (n && + ( PL_regkind[(U8)OP(n)] == NOTHING || + (stringok && (OP(n) == OP(scan)))) + && NEXT_OFF(n) + && NEXT_OFF(scan) + NEXT_OFF(n) < I16_MAX) { + if (OP(n) == TAIL || n > next) + stringok = 0; + if (PL_regkind[(U8)OP(n)] == NOTHING) { + NEXT_OFF(scan) += NEXT_OFF(n); + next = n + NODE_STEP_REGNODE; +#ifdef DEBUGGING + if (stringok) + stop = n; +#endif + n = regnext(n); + } + else { + int oldl = *OPERAND(scan); + regnode *nnext = regnext(n); + + if (oldl + *OPERAND(n) > U8_MAX) + break; + NEXT_OFF(scan) += NEXT_OFF(n); + *OPERAND(scan) += *OPERAND(n); + next = n + (*OPERAND(n) + 2 - 1)/sizeof(regnode) + 2; + /* Now we can overwrite *n : */ + Move(OPERAND(n) + 1, OPERAND(scan) + oldl + 1, + *OPERAND(n) + 1, char); +#ifdef DEBUGGING + if (stringok) + stop = next - 1; +#endif + n = nnext; + } + } +#ifdef DEBUGGING + /* Allow dumping */ + n = scan + (*OPERAND(scan) + 2 - 1)/sizeof(regnode) + 2; + while (n <= stop) { + /* Purify reports a benign UMR here sometimes, because we + * don't initialize the OP() slot of a node when that node + * is occupied by just the trailing null of the string in + * an EXACT node */ + if (PL_regkind[(U8)OP(n)] != NOTHING || OP(n) == NOTHING) { + OP(n) = OPTIMIZED; + NEXT_OFF(n) = 0; + } + n++; + } +#endif + + } + if (OP(scan) != CURLYX) { + int max = (reg_off_by_arg[OP(scan)] + ? I32_MAX + /* I32 may be smaller than U16 on CRAYs! */ + : (I32_MAX < U16_MAX ? I32_MAX : U16_MAX)); + int off = (reg_off_by_arg[OP(scan)] ? ARG(scan) : NEXT_OFF(scan)); + int noff; + regnode *n = scan; + + /* Skip NOTHING and LONGJMP. */ + while ((n = regnext(n)) + && ((PL_regkind[(U8)OP(n)] == NOTHING && (noff = NEXT_OFF(n))) + || ((OP(n) == LONGJMP) && (noff = ARG(n)))) + && off + noff < max) + off += noff; + if (reg_off_by_arg[OP(scan)]) + ARG(scan) = off; + else + NEXT_OFF(scan) = off; + } + if (OP(scan) == BRANCH || OP(scan) == BRANCHJ + || OP(scan) == IFTHEN || OP(scan) == SUSPEND) { + next = regnext(scan); + code = OP(scan); + + if (OP(next) == code || code == IFTHEN || code == SUSPEND) { + I32 max1 = 0, min1 = I32_MAX, num = 0; + + if (flags & SCF_DO_SUBSTR) + scan_commit(data); + while (OP(scan) == code) { + I32 deltanext, minnext; + + num++; + data_fake.flags = 0; + next = regnext(scan); + scan = NEXTOPER(scan); + if (code != BRANCH) + scan = NEXTOPER(scan); + /* We suppose the run is continuous, last=next...*/ + minnext = study_chunk(&scan, &deltanext, next, + &data_fake, 0); + if (min1 > minnext) + min1 = minnext; + if (max1 < minnext + deltanext) + max1 = minnext + deltanext; + if (deltanext == I32_MAX) + is_inf = is_inf_internal = 1; + scan = next; + if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR)) + pars++; + if (data && (data_fake.flags & SF_HAS_EVAL)) + data->flags |= SF_HAS_EVAL; + if (code == SUSPEND) + break; + } + if (code == IFTHEN && num < 2) /* Empty ELSE branch */ + min1 = 0; + if (flags & SCF_DO_SUBSTR) { + data->pos_min += min1; + data->pos_delta += max1 - min1; + if (max1 != min1 || is_inf) + data->longest = &(data->longest_float); + } + min += min1; + delta += max1 - min1; + } + else if (code == BRANCHJ) /* single branch is optimized. */ + scan = NEXTOPER(NEXTOPER(scan)); + else /* single branch is optimized. */ + scan = NEXTOPER(scan); + continue; + } + else if (OP(scan) == EXACT) { + I32 l = *OPERAND(scan); + if (UTF) { + unsigned char *s = (unsigned char *)(OPERAND(scan)+1); + unsigned char *e = s + l; + I32 newl = 0; + while (s < e) { + newl++; + s += UTF8SKIP(s); + } + l = newl; + } + min += l; + if (flags & SCF_DO_SUBSTR) { /* Update longest substr. */ + /* The code below prefers earlier match for fixed + offset, later match for variable offset. */ + if (data->last_end == -1) { /* Update the start info. */ + data->last_start_min = data->pos_min; + data->last_start_max = is_inf + ? I32_MAX : data->pos_min + data->pos_delta; + } + sv_catpvn(data->last_found, (char *)(OPERAND(scan)+1), *OPERAND(scan)); + data->last_end = data->pos_min + l; + data->pos_min += l; /* As in the first entry. */ + data->flags &= ~SF_BEFORE_EOL; + } + } + else if (PL_regkind[(U8)OP(scan)] == EXACT) { + I32 l = *OPERAND(scan); + if (flags & SCF_DO_SUBSTR) + scan_commit(data); + if (UTF) { + unsigned char *s = (unsigned char *)(OPERAND(scan)+1); + unsigned char *e = s + l; + I32 newl = 0; + while (s < e) { + newl++; + s += UTF8SKIP(s); + } + l = newl; + } + min += l; + if (data && (flags & SCF_DO_SUBSTR)) + data->pos_min += l; + } + else if (strchr(PL_varies,OP(scan))) { + I32 mincount, maxcount, minnext, deltanext, pos_before, fl; + regnode *oscan = scan; + + switch (PL_regkind[(U8)OP(scan)]) { + case WHILEM: + scan = NEXTOPER(scan); + goto finish; + case PLUS: + if (flags & SCF_DO_SUBSTR) { + next = NEXTOPER(scan); + if (OP(next) == EXACT) { + mincount = 1; + maxcount = REG_INFTY; + next = regnext(scan); + scan = NEXTOPER(scan); + goto do_curly; + } + } + if (flags & SCF_DO_SUBSTR) + data->pos_min++; + min++; + /* Fall through. */ + case STAR: + is_inf = is_inf_internal = 1; + scan = regnext(scan); + if (flags & SCF_DO_SUBSTR) { + scan_commit(data); + data->longest = &(data->longest_float); + } + goto optimize_curly_tail; + case CURLY: + mincount = ARG1(scan); + maxcount = ARG2(scan); + next = regnext(scan); + scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS; + do_curly: + if (flags & SCF_DO_SUBSTR) { + if (mincount == 0) scan_commit(data); + pos_before = data->pos_min; + } + if (data) { + fl = data->flags; + data->flags &= ~(SF_HAS_PAR|SF_IN_PAR|SF_HAS_EVAL); + if (is_inf) + data->flags |= SF_IS_INF; + } + /* This will finish on WHILEM, setting scan, or on NULL: */ + minnext = study_chunk(&scan, &deltanext, last, data, + mincount == 0 + ? (flags & ~SCF_DO_SUBSTR) : flags); + if (!scan) /* It was not CURLYX, but CURLY. */ + scan = next; + if (ckWARN(WARN_UNSAFE) && (minnext + deltanext == 0) + && !(data->flags & (SF_HAS_PAR|SF_IN_PAR)) + && maxcount <= REG_INFTY/3) /* Complement check for big count */ + Perl_warner(aTHX_ WARN_UNSAFE, "Strange *+?{} on zero-length expression"); + min += minnext * mincount; + is_inf_internal |= (maxcount == REG_INFTY + && (minnext + deltanext) > 0 + || deltanext == I32_MAX); + is_inf |= is_inf_internal; + delta += (minnext + deltanext) * maxcount - minnext * mincount; + + /* Try powerful optimization CURLYX => CURLYN. */ + if ( OP(oscan) == CURLYX && data + && data->flags & SF_IN_PAR + && !(data->flags & SF_HAS_EVAL) + && !deltanext && minnext == 1 ) { + /* Try to optimize to CURLYN. */ + regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; + regnode *nxt1 = nxt, *nxt2; + + /* Skip open. */ + nxt = regnext(nxt); + if (!strchr(PL_simple,OP(nxt)) + && !(PL_regkind[(U8)OP(nxt)] == EXACT + && *OPERAND(nxt) == 1)) + goto nogo; + nxt2 = nxt; + nxt = regnext(nxt); + if (OP(nxt) != CLOSE) + goto nogo; + /* Now we know that nxt2 is the only contents: */ + oscan->flags = ARG(nxt); + OP(oscan) = CURLYN; + OP(nxt1) = NOTHING; /* was OPEN. */ +#ifdef DEBUGGING + OP(nxt1 + 1) = OPTIMIZED; /* was count. */ + NEXT_OFF(nxt1+ 1) = 0; /* just for consistancy. */ + NEXT_OFF(nxt2) = 0; /* just for consistancy with CURLY. */ + OP(nxt) = OPTIMIZED; /* was CLOSE. */ + OP(nxt + 1) = OPTIMIZED; /* was count. */ + NEXT_OFF(nxt+ 1) = 0; /* just for consistancy. */ +#endif + } + nogo: + + /* Try optimization CURLYX => CURLYM. */ + if ( OP(oscan) == CURLYX && data + && !(data->flags & SF_HAS_PAR) + && !(data->flags & SF_HAS_EVAL) + && !deltanext ) { + /* XXXX How to optimize if data == 0? */ + /* Optimize to a simpler form. */ + regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN */ + regnode *nxt2; + + OP(oscan) = CURLYM; + while ( (nxt2 = regnext(nxt)) /* skip over embedded stuff*/ + && (OP(nxt2) != WHILEM)) + nxt = nxt2; + OP(nxt2) = SUCCEED; /* Whas WHILEM */ + /* Need to optimize away parenths. */ + if (data->flags & SF_IN_PAR) { + /* Set the parenth number. */ + regnode *nxt1 = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN*/ + + if (OP(nxt) != CLOSE) + FAIL("panic opt close"); + oscan->flags = ARG(nxt); + OP(nxt1) = OPTIMIZED; /* was OPEN. */ + OP(nxt) = OPTIMIZED; /* was CLOSE. */ +#ifdef DEBUGGING + OP(nxt1 + 1) = OPTIMIZED; /* was count. */ + OP(nxt + 1) = OPTIMIZED; /* was count. */ + NEXT_OFF(nxt1 + 1) = 0; /* just for consistancy. */ + NEXT_OFF(nxt + 1) = 0; /* just for consistancy. */ +#endif +#if 0 + while ( nxt1 && (OP(nxt1) != WHILEM)) { + regnode *nnxt = regnext(nxt1); + + if (nnxt == nxt) { + if (reg_off_by_arg[OP(nxt1)]) + ARG_SET(nxt1, nxt2 - nxt1); + else if (nxt2 - nxt1 < U16_MAX) + NEXT_OFF(nxt1) = nxt2 - nxt1; + else + OP(nxt) = NOTHING; /* Cannot beautify */ + } + nxt1 = nnxt; + } +#endif + /* Optimize again: */ + study_chunk(&nxt1, &deltanext, nxt, NULL, 0); + } + else + oscan->flags = 0; + } + if (data && fl & (SF_HAS_PAR|SF_IN_PAR)) + pars++; + if (flags & SCF_DO_SUBSTR) { + SV *last_str = Nullsv; + int counted = mincount != 0; + + if (data->last_end > 0 && mincount != 0) { /* Ends with a string. */ + I32 b = pos_before >= data->last_start_min + ? pos_before : data->last_start_min; + STRLEN l; + char *s = SvPV(data->last_found, l); + I32 old = b - data->last_start_min; + + if (UTF) + old = utf8_hop((U8*)s, old) - (U8*)s; + + l -= old; + /* Get the added string: */ + last_str = newSVpvn(s + old, l); + if (deltanext == 0 && pos_before == b) { + /* What was added is a constant string */ + if (mincount > 1) { + SvGROW(last_str, (mincount * l) + 1); + repeatcpy(SvPVX(last_str) + l, + SvPVX(last_str), l, mincount - 1); + SvCUR(last_str) *= mincount; + /* Add additional parts. */ + SvCUR_set(data->last_found, + SvCUR(data->last_found) - l); + sv_catsv(data->last_found, last_str); + data->last_end += l * (mincount - 1); + } + } + } + /* It is counted once already... */ + data->pos_min += minnext * (mincount - counted); + data->pos_delta += - counted * deltanext + + (minnext + deltanext) * maxcount - minnext * mincount; + if (mincount != maxcount) { + scan_commit(data); + if (mincount && last_str) { + sv_setsv(data->last_found, last_str); + data->last_end = data->pos_min; + data->last_start_min = + data->pos_min - CHR_SVLEN(last_str); + data->last_start_max = is_inf + ? I32_MAX + : data->pos_min + data->pos_delta + - CHR_SVLEN(last_str); + } + data->longest = &(data->longest_float); + } + SvREFCNT_dec(last_str); + } + if (data && (fl & SF_HAS_EVAL)) + data->flags |= SF_HAS_EVAL; + optimize_curly_tail: + if (OP(oscan) != CURLYX) { + while (PL_regkind[(U8)OP(next = regnext(oscan))] == NOTHING + && NEXT_OFF(next)) + NEXT_OFF(oscan) += NEXT_OFF(next); + } + continue; + default: /* REF only? */ + if (flags & SCF_DO_SUBSTR) { + scan_commit(data); + data->longest = &(data->longest_float); + } + is_inf = is_inf_internal = 1; + break; + } + } + else if (strchr(PL_simple,OP(scan)) || PL_regkind[(U8)OP(scan)] == ANYUTF8) { + if (flags & SCF_DO_SUBSTR) { + scan_commit(data); + data->pos_min++; + } + min++; + } + else if (PL_regkind[(U8)OP(scan)] == EOL && flags & SCF_DO_SUBSTR) { + data->flags |= (OP(scan) == MEOL + ? SF_BEFORE_MEOL + : SF_BEFORE_SEOL); + } + else if (PL_regkind[(U8)OP(scan)] == BRANCHJ + && (scan->flags || data) + && (OP(scan) == IFMATCH || OP(scan) == UNLESSM)) { + I32 deltanext, minnext; + regnode *nscan; + + data_fake.flags = 0; + next = regnext(scan); + nscan = NEXTOPER(NEXTOPER(scan)); + minnext = study_chunk(&nscan, &deltanext, last, &data_fake, 0); + if (scan->flags) { + if (deltanext) { + FAIL("variable length lookbehind not implemented"); + } + else if (minnext > U8_MAX) { + FAIL2("lookbehind longer than %d not implemented", U8_MAX); + } + scan->flags = minnext; + } + if (data && data_fake.flags & (SF_HAS_PAR|SF_IN_PAR)) + pars++; + if (data && (data_fake.flags & SF_HAS_EVAL)) + data->flags |= SF_HAS_EVAL; + } + else if (OP(scan) == OPEN) { + pars++; + } + else if (OP(scan) == CLOSE && ARG(scan) == is_par) { + next = regnext(scan); + + if ( next && (OP(next) != WHILEM) && next < last) + is_par = 0; /* Disable optimization */ + } + else if (OP(scan) == EVAL) { + if (data) + data->flags |= SF_HAS_EVAL; + } + else if (OP(scan) == LOGICAL && scan->flags == 2) { /* Embedded */ + if (flags & SCF_DO_SUBSTR) { + scan_commit(data); + data->longest = &(data->longest_float); + } + is_inf = is_inf_internal = 1; + } + /* Else: zero-length, ignore. */ + scan = regnext(scan); + } + + finish: + *scanp = scan; + *deltap = is_inf_internal ? I32_MAX : delta; + if (flags & SCF_DO_SUBSTR && is_inf) + data->pos_delta = I32_MAX - data->pos_min; + if (is_par > U8_MAX) + is_par = 0; + if (is_par && pars==1 && data) { + data->flags |= SF_IN_PAR; + data->flags &= ~SF_HAS_PAR; + } + else if (pars && data) { + data->flags |= SF_HAS_PAR; + data->flags &= ~SF_IN_PAR; + } + return min; +} + +STATIC I32 +S_add_data(pTHX_ I32 n, char *s) +{ + dTHR; + if (PL_regcomp_rx->data) { + Renewc(PL_regcomp_rx->data, + sizeof(*PL_regcomp_rx->data) + sizeof(void*) * (PL_regcomp_rx->data->count + n - 1), + char, struct reg_data); + Renew(PL_regcomp_rx->data->what, PL_regcomp_rx->data->count + n, U8); + PL_regcomp_rx->data->count += n; + } + else { + Newc(1207, PL_regcomp_rx->data, sizeof(*PL_regcomp_rx->data) + sizeof(void*) * (n - 1), + char, struct reg_data); + New(1208, PL_regcomp_rx->data->what, n, U8); + PL_regcomp_rx->data->count = n; + } + Copy(s, PL_regcomp_rx->data->what + PL_regcomp_rx->data->count - n, n, U8); + return PL_regcomp_rx->data->count - n; +} + +void +Perl_reginitcolors(pTHX) +{ + dTHR; + int i = 0; + char *s = PerlEnv_getenv("PERL_RE_COLORS"); + + if (s) { + PL_colors[0] = s = savepv(s); + while (++i < 6) { + s = strchr(s, '\t'); + if (s) { + *s = '\0'; + PL_colors[i] = ++s; + } + else + PL_colors[i] = s = ""; + } + } else { + while (i < 6) + PL_colors[i++] = ""; + } + PL_colorset = 1; +} /* - - regcomp - compile a regular expression into internal code + - pregcomp - compile a regular expression into internal code * * We can't allocate space until we know how big the compiled form will be, * but we can't compile it (and thus know how big it is) until we've got a @@ -121,171 +767,271 @@ STATIC void regoptail(); * of the structure of the compiled regexp. [I'll say.] */ regexp * -regcomp(exp,xend,fold,rare) -char *exp; -char *xend; -int fold; -int rare; +Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm) { - register regexp *r; - register char *scan; - register STR *longest; - register int len; - register char *first; - int flags; - int back; - int curback; - extern char *safemalloc(); - extern char *savestr(); - - if (exp == NULL) - fatal("NULL regexp argument"); - - /* First pass: determine size, legality. */ - regfold = fold; - regparse = exp; - regxend = xend; - regprecomp = nsavestr(exp,xend-exp); - regsawbracket = 0; - regnpar = 1; - regsize = 0L; - regcode = ®dummy; - regc(MAGIC); - if (reg(0, &flags) == NULL) { - Safefree(regprecomp); - return(NULL); + dTHR; + register regexp *r; + regnode *scan; + SV **longest; + SV *longest_fixed; + SV *longest_float; + regnode *first; + I32 flags; + I32 minlen = 0; + I32 sawplus = 0; + I32 sawopen = 0; + + if (exp == NULL) + FAIL("NULL regexp argument"); + + if (PL_curcop == &PL_compiling ? (PL_hints & HINT_UTF8) : IN_UTF8) + PL_reg_flags |= RF_utf8; + else + PL_reg_flags = 0; + + PL_regprecomp = savepvn(exp, xend - exp); + DEBUG_r(if (!PL_colorset) reginitcolors()); + DEBUG_r(PerlIO_printf(Perl_debug_log, "%sCompiling%s RE `%s%*s%s'\n", + PL_colors[4],PL_colors[5],PL_colors[0], + xend - exp, PL_regprecomp, PL_colors[1])); + PL_regflags = pm->op_pmflags; + PL_regsawback = 0; + + PL_regseen = 0; + PL_seen_zerolen = *exp == '^' ? -1 : 0; + PL_seen_evals = 0; + PL_extralen = 0; + + /* First pass: determine size, legality. */ + PL_regcomp_parse = exp; + PL_regxend = xend; + PL_regnaughty = 0; + PL_regnpar = 1; + PL_regsize = 0L; + PL_regcode = &PL_regdummy; + regc((U8)REG_MAGIC, (char*)PL_regcode); + if (reg(0, &flags) == NULL) { + Safefree(PL_regprecomp); + PL_regprecomp = Nullch; + return(NULL); + } + DEBUG_r(PerlIO_printf(Perl_debug_log, "size %d ", PL_regsize)); + + /* Small enough for pointer-storage convention? + If extralen==0, this means that we will not need long jumps. */ + if (PL_regsize >= 0x10000L && PL_extralen) + PL_regsize += PL_extralen; + else + PL_extralen = 0; + + /* Allocate space and initialize. */ + Newc(1001, r, sizeof(regexp) + (unsigned)PL_regsize * sizeof(regnode), + char, regexp); + if (r == NULL) + FAIL("regexp out of space"); + r->refcnt = 1; + r->prelen = xend - exp; + r->precomp = PL_regprecomp; + r->subbeg = NULL; + r->reganch = pm->op_pmflags & PMf_COMPILETIME; + r->nparens = PL_regnpar - 1; /* set early to validate backrefs */ + + r->substrs = 0; /* Useful during FAIL. */ + r->startp = 0; /* Useful during FAIL. */ + r->endp = 0; /* Useful during FAIL. */ + + PL_regcomp_rx = r; + + /* Second pass: emit code. */ + PL_regcomp_parse = exp; + PL_regxend = xend; + PL_regnaughty = 0; + PL_regnpar = 1; + PL_regcode = r->program; + /* Store the count of eval-groups for security checks: */ + PL_regcode->next_off = ((PL_seen_evals > U16_MAX) ? U16_MAX : PL_seen_evals); + regc((U8)REG_MAGIC, (char*) PL_regcode++); + r->data = 0; + if (reg(0, &flags) == NULL) + return(NULL); + + /* Dig out information for optimizations. */ + r->reganch = pm->op_pmflags & PMf_COMPILETIME; /* Again? */ + pm->op_pmflags = PL_regflags; + if (UTF) + r->reganch |= ROPT_UTF8; + r->regstclass = NULL; + if (PL_regnaughty >= 10) /* Probably an expensive pattern. */ + r->reganch |= ROPT_NAUGHTY; + scan = r->program + 1; /* First BRANCH. */ + + /* XXXX To minimize changes to RE engine we always allocate + 3-units-long substrs field. */ + Newz(1004, r->substrs, 1, struct reg_substr_data); + + if (OP(scan) != BRANCH) { /* Only one top-level choice. */ + scan_data_t data; + I32 fake; + STRLEN longest_float_length, longest_fixed_length; + + StructCopy(&zero_scan_data, &data, scan_data_t); + first = scan; + /* Skip introductions and multiplicators >= 1. */ + while ((OP(first) == OPEN && (sawopen = 1)) || + (OP(first) == BRANCH && OP(regnext(first)) != BRANCH) || + (OP(first) == PLUS) || + (OP(first) == MINMOD) || + (PL_regkind[(U8)OP(first)] == CURLY && ARG1(first) > 0) ) { + if (OP(first) == PLUS) + sawplus = 1; + else + first += regarglen[(U8)OP(first)]; + first = NEXTOPER(first); } - /* Small enough for pointer-storage convention? */ - if (regsize >= 32767L) /* Probably could be 65535L. */ - FAIL("regexp too big"); - - /* Allocate space. */ - Newc(1001, r, sizeof(regexp) + (unsigned)regsize, char, regexp); - if (r == NULL) - FAIL("regexp out of space"); - - /* Second pass: emit code. */ - if (regsawbracket) - bcopy(regprecomp,exp,xend-exp); - r->precomp = regprecomp; - r->subbase = NULL; - regparse = exp; - regnpar = 1; - regcode = r->program; - regc(MAGIC); - if (reg(0, &flags) == NULL) - return(NULL); - - /* Dig out information for optimizations. */ - r->regstart = Nullstr; /* Worst-case defaults. */ - r->reganch = 0; - r->regmust = Nullstr; - r->regback = -1; - r->regstclass = Nullch; - scan = r->program+1; /* First BRANCH. */ - if (OP(regnext(scan)) == END) {/* Only one top-level choice. */ - scan = NEXTOPER(scan); - - first = scan; - while ((OP(first) > OPEN && OP(first) < CLOSE) || - (OP(first) == BRANCH && OP(regnext(first)) != BRANCH) || - (OP(first) == PLUS) ) - first = NEXTOPER(first); - - /* Starting-point info. */ - if (OP(first) == EXACTLY) { - r->regstart = - str_make(OPERAND(first)+1,*OPERAND(first)); - if (r->regstart->str_cur > !(sawstudy|fold)) - fbmcompile(r->regstart,fold); - } - else if ((exp = index(simple,OP(first))) && exp > simple) - r->regstclass = first; - else if (OP(first) == BOUND || OP(first) == NBOUND) - r->regstclass = first; - else if (OP(first) == BOL) - r->reganch++; + /* Starting-point info. */ + again: + if (OP(first) == EXACT); /* Empty, get anchored substr later. */ + else if (strchr(PL_simple+4,OP(first))) + r->regstclass = first; + else if (PL_regkind[(U8)OP(first)] == BOUND || + PL_regkind[(U8)OP(first)] == NBOUND) + r->regstclass = first; + else if (PL_regkind[(U8)OP(first)] == BOL) { + r->reganch |= (OP(first) == MBOL ? ROPT_ANCH_MBOL: ROPT_ANCH_BOL); + first = NEXTOPER(first); + goto again; + } + else if (OP(first) == GPOS) { + r->reganch |= ROPT_ANCH_GPOS; + first = NEXTOPER(first); + goto again; + } + else if ((OP(first) == STAR && + PL_regkind[(U8)OP(NEXTOPER(first))] == REG_ANY) && + !(r->reganch & ROPT_ANCH) ) + { + /* turn .* into ^.* with an implied $*=1 */ + r->reganch |= ROPT_ANCH_BOL | ROPT_IMPLICIT; + first = NEXTOPER(first); + goto again; + } + if (sawplus && (!sawopen || !PL_regsawback)) + r->reganch |= ROPT_SKIP; /* x+ must match 1st of run */ + + /* Scan is after the zeroth branch, first is atomic matcher. */ + DEBUG_r(PerlIO_printf(Perl_debug_log, "first at %d\n", + first - scan + 1)); + /* + * If there's something expensive in the r.e., find the + * longest literal string that must appear and make it the + * regmust. Resolve ties in favor of later strings, since + * the regstart check works with the beginning of the r.e. + * and avoiding duplication strengthens checking. Not a + * strong reason, but sufficient in the absence of others. + * [Now we resolve ties in favor of the earlier string if + * it happens that c_offset_min has been invalidated, since the + * earlier string may buy us something the later one won't.] + */ + minlen = 0; + + data.longest_fixed = newSVpvn("",0); + data.longest_float = newSVpvn("",0); + data.last_found = newSVpvn("",0); + data.longest = &(data.longest_fixed); + first = scan; + + minlen = study_chunk(&first, &fake, scan + PL_regsize, /* Up to end */ + &data, SCF_DO_SUBSTR); + if ( PL_regnpar == 1 && data.longest == &(data.longest_fixed) + && data.last_start_min == 0 && data.last_end > 0 + && !PL_seen_zerolen + && (!(PL_regseen & REG_SEEN_GPOS) || (r->reganch & ROPT_ANCH_GPOS))) + r->reganch |= ROPT_CHECK_ALL; + scan_commit(&data); + SvREFCNT_dec(data.last_found); + + longest_float_length = CHR_SVLEN(data.longest_float); + if (longest_float_length + || (data.flags & SF_FL_BEFORE_EOL + && (!(data.flags & SF_FL_BEFORE_MEOL) + || (PL_regflags & PMf_MULTILINE)))) { + int t; + + if (SvCUR(data.longest_fixed) /* ok to leave SvCUR */ + && data.offset_fixed == data.offset_float_min + && SvCUR(data.longest_fixed) == SvCUR(data.longest_float)) + goto remove_float; /* As in (a)+. */ + + r->float_substr = data.longest_float; + r->float_min_offset = data.offset_float_min; + r->float_max_offset = data.offset_float_max; + t = (data.flags & SF_FL_BEFORE_EOL /* Can't have SEOL and MULTI */ + && (!(data.flags & SF_FL_BEFORE_MEOL) + || (PL_regflags & PMf_MULTILINE))); + fbm_compile(r->float_substr, t ? FBMcf_TAIL : 0); + } + else { + remove_float: + r->float_substr = Nullsv; + SvREFCNT_dec(data.longest_float); + longest_float_length = 0; + } -#ifdef DEBUGGING - if (debug & 512) - fprintf(stderr,"first %d next %d offset %d\n", - OP(first), OP(NEXTOPER(first)), first - scan); -#endif - /* - * If there's something expensive in the r.e., find the - * longest literal string that must appear and make it the - * regmust. Resolve ties in favor of later strings, since - * the regstart check works with the beginning of the r.e. - * and avoiding duplication strengthens checking. Not a - * strong reason, but sufficient in the absence of others. - * [Now we resolve ties in favor of the earlier string if - * it happens that curback has been invalidated, since the - * earlier string may buy us something the later one won't.] - */ - longest = str_make("",0); - len = 0; - curback = 0; - back = 0; - while (scan != NULL) { - if (OP(scan) == BRANCH) { - if (OP(regnext(scan)) == BRANCH) { - curback = -30000; - while (OP(scan) == BRANCH) - scan = regnext(scan); - } - else /* single branch is ok */ - scan = NEXTOPER(scan); - } - if (OP(scan) == EXACTLY) { - first = scan; - while (OP(regnext(scan)) >= CLOSE) - scan = regnext(scan); - if (curback - back == len) { - str_ncat(longest, OPERAND(first)+1, - *OPERAND(first)); - len += *OPERAND(first); - curback += *OPERAND(first); - first = regnext(scan); - } - else if (*OPERAND(first) >= len + (curback >= 0)) { - len = *OPERAND(first); - str_nset(longest, OPERAND(first)+1,len); - back = curback; - curback += len; - first = regnext(scan); - } - else - curback += *OPERAND(first); - } - else if (index(varies,OP(scan))) - curback = -30000; - else if (index(simple,OP(scan))) - curback++; - scan = regnext(scan); - } - if (len) { - r->regmust = longest; - if (back < 0) - back = -1; - r->regback = back; - if (len > !(sawstudy||fold||OP(first)==EOL)) - fbmcompile(r->regmust,fold); - r->regmust->str_u.str_useful = 100; - if (OP(first) == EOL) /* is match anchored to EOL? */ - r->regmust->str_pok |= SP_TAIL; - } - else - str_free(longest); + longest_fixed_length = CHR_SVLEN(data.longest_fixed); + if (longest_fixed_length + || (data.flags & SF_FIX_BEFORE_EOL /* Cannot have SEOL and MULTI */ + && (!(data.flags & SF_FIX_BEFORE_MEOL) + || (PL_regflags & PMf_MULTILINE)))) { + int t; + + r->anchored_substr = data.longest_fixed; + r->anchored_offset = data.offset_fixed; + t = (data.flags & SF_FIX_BEFORE_EOL /* Can't have SEOL and MULTI */ + && (!(data.flags & SF_FIX_BEFORE_MEOL) + || (PL_regflags & PMf_MULTILINE))); + fbm_compile(r->anchored_substr, t ? FBMcf_TAIL : 0); + } + else { + r->anchored_substr = Nullsv; + SvREFCNT_dec(data.longest_fixed); + longest_fixed_length = 0; } - r->do_folding = fold; - r->nparens = regnpar - 1; -#ifdef DEBUGGING - if (debug & 512) - regdump(r); -#endif - return(r); + /* A temporary algorithm prefers floated substr to fixed one to dig more info. */ + if (longest_fixed_length > longest_float_length) { + r->check_substr = r->anchored_substr; + r->check_offset_min = r->check_offset_max = r->anchored_offset; + if (r->reganch & ROPT_ANCH_SINGLE) + r->reganch |= ROPT_NOSCAN; + } + else { + r->check_substr = r->float_substr; + r->check_offset_min = data.offset_float_min; + r->check_offset_max = data.offset_float_max; + } + } + else { + /* Several toplevels. Best we can is to set minlen. */ + I32 fake; + + DEBUG_r(PerlIO_printf(Perl_debug_log, "\n")); + scan = r->program + 1; + minlen = study_chunk(&scan, &fake, scan + PL_regsize, NULL, 0); + r->check_substr = r->anchored_substr = r->float_substr = Nullsv; + } + + r->minlen = minlen; + if (PL_regseen & REG_SEEN_GPOS) + r->reganch |= ROPT_GPOS_SEEN; + if (PL_regseen & REG_SEEN_LOOKBEHIND) + r->reganch |= ROPT_LOOKBEHIND_SEEN; + if (PL_regseen & REG_SEEN_EVAL) + r->reganch |= ROPT_EVAL_SEEN; + Newz(1002, r->startp, PL_regnpar, I32); + Newz(1002, r->endp, PL_regnpar, I32); + DEBUG_r(regdump(r)); + return(r); } /* @@ -297,71 +1043,328 @@ int rare; * is a trifle forced, but the need to tie the tails of the branches to what * follows makes it hard to avoid. */ -static char * -reg(paren, flagp) -int paren; /* Parenthesized? */ -int *flagp; +STATIC regnode * +S_reg(pTHX_ I32 paren, I32 *flagp) + /* paren: Parenthesized? 0=top, 1=(, inside: changed to letter. */ { - register char *ret; - register char *br; - register char *ender; - register int parno; - int flags; - - *flagp = HASWIDTH; /* Tentatively. */ - - /* Make an OPEN node, if parenthesized. */ - if (paren) { - if (regnpar >= NSUBEXP) - FAIL("too many () in regexp"); - parno = regnpar; - regnpar++; - ret = regnode(OPEN+parno); - } else - ret = NULL; - - /* Pick up the branches, linking them together. */ - br = regbranch(&flags); - if (br == NULL) - return(NULL); - if (ret != NULL) - regtail(ret, br); /* OPEN -> first. */ + dTHR; + register regnode *ret; /* Will be the head of the group. */ + register regnode *br; + register regnode *lastbr; + register regnode *ender = 0; + register I32 parno = 0; + I32 flags, oregflags = PL_regflags, have_branch = 0, open = 0; + char c; + + *flagp = 0; /* Tentatively. */ + + /* Make an OPEN node, if parenthesized. */ + if (paren) { + if (*PL_regcomp_parse == '?') { + U16 posflags = 0, negflags = 0; + U16 *flagsp = &posflags; + int logical = 0; + + PL_regcomp_parse++; + paren = *PL_regcomp_parse++; + ret = NULL; /* For look-ahead/behind. */ + switch (paren) { + case '<': + PL_regseen |= REG_SEEN_LOOKBEHIND; + if (*PL_regcomp_parse == '!') + paren = ','; + if (*PL_regcomp_parse != '=' && *PL_regcomp_parse != '!') + goto unknown; + PL_regcomp_parse++; + case '=': + case '!': + PL_seen_zerolen++; + case ':': + case '>': + break; + case '$': + case '@': + FAIL2("Sequence (?%c...) not implemented", (int)paren); + break; + case '#': + while (*PL_regcomp_parse && *PL_regcomp_parse != ')') + PL_regcomp_parse++; + if (*PL_regcomp_parse != ')') + FAIL("Sequence (?#... not terminated"); + nextchar(); + *flagp = TRYAGAIN; + return NULL; + case 'p': + logical = 1; + paren = *PL_regcomp_parse++; + /* FALL THROUGH */ + case '{': + { + dTHR; + I32 count = 1, n = 0; + char c; + char *s = PL_regcomp_parse; + SV *sv; + OP_4tree *sop, *rop; + + PL_seen_zerolen++; + PL_regseen |= REG_SEEN_EVAL; + while (count && (c = *PL_regcomp_parse)) { + if (c == '\\' && PL_regcomp_parse[1]) + PL_regcomp_parse++; + else if (c == '{') + count++; + else if (c == '}') + count--; + PL_regcomp_parse++; + } + if (*PL_regcomp_parse != ')') + FAIL("Sequence (?{...}) not terminated or not {}-balanced"); + if (!SIZE_ONLY) { + AV *av; + + if (PL_regcomp_parse - 1 - s) + sv = newSVpvn(s, PL_regcomp_parse - 1 - s); + else + sv = newSVpvn("", 0); + + rop = sv_compile_2op(sv, &sop, "re", &av); + + n = add_data(3, "nop"); + PL_regcomp_rx->data->data[n] = (void*)rop; + PL_regcomp_rx->data->data[n+1] = (void*)sop; + PL_regcomp_rx->data->data[n+2] = (void*)av; + SvREFCNT_dec(sv); + } + else { /* First pass */ + if (PL_reginterp_cnt < ++PL_seen_evals + && PL_curcop != &PL_compiling) + /* No compiled RE interpolated, has runtime + components ===> unsafe. */ + FAIL("Eval-group not allowed at runtime, use re 'eval'"); + if (PL_tainted) + FAIL("Eval-group in insecure regular expression"); + } + + nextchar(); + if (logical) { + ret = reg_node(LOGICAL); + if (!SIZE_ONLY) + ret->flags = 2; + regtail(ret, reganode(EVAL, n)); + return ret; + } + return reganode(EVAL, n); + } + case '(': + { + if (PL_regcomp_parse[0] == '?') { + if (PL_regcomp_parse[1] == '=' || PL_regcomp_parse[1] == '!' + || PL_regcomp_parse[1] == '<' + || PL_regcomp_parse[1] == '{') { /* Lookahead or eval. */ + I32 flag; + + ret = reg_node(LOGICAL); + if (!SIZE_ONLY) + ret->flags = 1; + regtail(ret, reg(1, &flag)); + goto insert_if; + } + } + else if (PL_regcomp_parse[0] >= '1' && PL_regcomp_parse[0] <= '9' ) { + parno = atoi(PL_regcomp_parse++); + + while (isDIGIT(*PL_regcomp_parse)) + PL_regcomp_parse++; + ret = reganode(GROUPP, parno); + if ((c = *nextchar()) != ')') + FAIL2("Switch (?(number%c not recognized", c); + insert_if: + regtail(ret, reganode(IFTHEN, 0)); + br = regbranch(&flags, 1); + if (br == NULL) + br = reganode(LONGJMP, 0); + else + regtail(br, reganode(LONGJMP, 0)); + c = *nextchar(); + if (flags&HASWIDTH) + *flagp |= HASWIDTH; + if (c == '|') { + lastbr = reganode(IFTHEN, 0); /* Fake one for optimizer. */ + regbranch(&flags, 1); + regtail(ret, lastbr); + if (flags&HASWIDTH) + *flagp |= HASWIDTH; + c = *nextchar(); + } + else + lastbr = NULL; + if (c != ')') + FAIL("Switch (?(condition)... contains too many branches"); + ender = reg_node(TAIL); + regtail(br, ender); + if (lastbr) { + regtail(lastbr, ender); + regtail(NEXTOPER(NEXTOPER(lastbr)), ender); + } + else + regtail(ret, ender); + return ret; + } + else { + FAIL2("Unknown condition for (?(%.2s", PL_regcomp_parse); + } + } + case 0: + FAIL("Sequence (? incomplete"); + break; + default: + --PL_regcomp_parse; + parse_flags: + while (*PL_regcomp_parse && strchr("iogcmsx", *PL_regcomp_parse)) { + if (*PL_regcomp_parse != 'o') + pmflag(flagsp, *PL_regcomp_parse); + ++PL_regcomp_parse; + } + if (*PL_regcomp_parse == '-') { + flagsp = &negflags; + ++PL_regcomp_parse; + goto parse_flags; + } + PL_regflags |= posflags; + PL_regflags &= ~negflags; + if (*PL_regcomp_parse == ':') { + PL_regcomp_parse++; + paren = ':'; + break; + } + unknown: + if (*PL_regcomp_parse != ')') + FAIL2("Sequence (?%c...) not recognized", *PL_regcomp_parse); + nextchar(); + *flagp = TRYAGAIN; + return NULL; + } + } + else { + parno = PL_regnpar; + PL_regnpar++; + ret = reganode(OPEN, parno); + open = 1; + } + } + else + ret = NULL; + + /* Pick up the branches, linking them together. */ + br = regbranch(&flags, 1); + if (br == NULL) + return(NULL); + if (*PL_regcomp_parse == '|') { + if (!SIZE_ONLY && PL_extralen) { + reginsert(BRANCHJ, br); + } else - ret = br; - if (!(flags&HASWIDTH)) - *flagp &= ~HASWIDTH; - *flagp |= flags&SPSTART; - while (*regparse == '|') { - regparse++; - br = regbranch(&flags); - if (br == NULL) - return(NULL); - regtail(ret, br); /* BRANCH -> BRANCH. */ - if (!(flags&HASWIDTH)) - *flagp &= ~HASWIDTH; - *flagp |= flags&SPSTART; + reginsert(BRANCH, br); + have_branch = 1; + if (SIZE_ONLY) + PL_extralen += 1; /* For BRANCHJ-BRANCH. */ + } + else if (paren == ':') { + *flagp |= flags&SIMPLE; + } + if (open) { /* Starts with OPEN. */ + regtail(ret, br); /* OPEN -> first. */ + } + else if (paren != '?') /* Not Conditional */ + ret = br; + if (flags&HASWIDTH) + *flagp |= HASWIDTH; + *flagp |= flags&SPSTART; + lastbr = br; + while (*PL_regcomp_parse == '|') { + if (!SIZE_ONLY && PL_extralen) { + ender = reganode(LONGJMP,0); + regtail(NEXTOPER(NEXTOPER(lastbr)), ender); /* Append to the previous. */ } + if (SIZE_ONLY) + PL_extralen += 2; /* Account for LONGJMP. */ + nextchar(); + br = regbranch(&flags, 0); + if (br == NULL) + return(NULL); + regtail(lastbr, br); /* BRANCH -> BRANCH. */ + lastbr = br; + if (flags&HASWIDTH) + *flagp |= HASWIDTH; + *flagp |= flags&SPSTART; + } + if (have_branch || paren != ':') { /* Make a closing node, and hook it on the end. */ - ender = regnode((paren) ? CLOSE+parno : END); - regtail(ret, ender); + switch (paren) { + case ':': + ender = reg_node(TAIL); + break; + case 1: + ender = reganode(CLOSE, parno); + break; + case '<': + case ',': + case '=': + case '!': + *flagp &= ~HASWIDTH; + /* FALL THROUGH */ + case '>': + ender = reg_node(SUCCEED); + break; + case 0: + ender = reg_node(END); + break; + } + regtail(lastbr, ender); - /* Hook the tails of the branches to the closing node. */ - for (br = ret; br != NULL; br = regnext(br)) + if (have_branch) { + /* Hook the tails of the branches to the closing node. */ + for (br = ret; br != NULL; br = regnext(br)) { regoptail(br, ender); + } + } + } + + { + char *p; + static char parens[] = "=!<,>"; - /* Check for proper termination. */ - if (paren && *regparse++ != ')') { - FAIL("unmatched () in regexp"); - } else if (!paren && regparse < regxend) { - if (*regparse == ')') { - FAIL("unmatched () in regexp"); - } else - FAIL("junk on end of regexp"); /* "Can't happen". */ - /* NOTREACHED */ + if (paren && (p = strchr(parens, paren))) { + int node = ((p - parens) % 2) ? UNLESSM : IFMATCH; + int flag = (p - parens) > 1; + + if (paren == '>') + node = SUSPEND, flag = 0; + reginsert(node,ret); + ret->flags = flag; + regtail(ret, reg_node(TAIL)); } + } - return(ret); + /* Check for proper termination. */ + if (paren) { + PL_regflags = oregflags; + if (PL_regcomp_parse >= PL_regxend || *nextchar() != ')') { + FAIL("unmatched () in regexp"); + } + } + else if (!paren && PL_regcomp_parse < PL_regxend) { + if (*PL_regcomp_parse == ')') { + FAIL("unmatched () in regexp"); + } + else + FAIL("junk on end of regexp"); /* "Can't happen". */ + /* NOTREACHED */ + } + + return(ret); } /* @@ -369,34 +1372,61 @@ int *flagp; * * Implements the concatenation operator. */ -static char * -regbranch(flagp) -int *flagp; +STATIC regnode * +S_regbranch(pTHX_ I32 *flagp, I32 first) { - register char *ret; - register char *chain; - register char *latest; - int flags; - - *flagp = WORST; /* Tentatively. */ - - ret = regnode(BRANCH); - chain = NULL; - while (regparse < regxend && *regparse != '|' && *regparse != ')') { - latest = regpiece(&flags); - if (latest == NULL) - return(NULL); - *flagp |= flags&HASWIDTH; - if (chain == NULL) /* First piece. */ - *flagp |= flags&SPSTART; - else - regtail(chain, latest); - chain = latest; + dTHR; + register regnode *ret; + register regnode *chain = NULL; + register regnode *latest; + I32 flags = 0, c = 0; + + if (first) + ret = NULL; + else { + if (!SIZE_ONLY && PL_extralen) + ret = reganode(BRANCHJ,0); + else + ret = reg_node(BRANCH); + } + + if (!first && SIZE_ONLY) + PL_extralen += 1; /* BRANCHJ */ + + *flagp = WORST; /* Tentatively. */ + + PL_regcomp_parse--; + nextchar(); + while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != '|' && *PL_regcomp_parse != ')') { + flags &= ~TRYAGAIN; + latest = regpiece(&flags); + if (latest == NULL) { + if (flags & TRYAGAIN) + continue; + return(NULL); + } + else if (ret == NULL) + ret = latest; + *flagp |= flags&HASWIDTH; + if (chain == NULL) /* First piece. */ + *flagp |= flags&SPSTART; + else { + PL_regnaughty++; + regtail(chain, latest); } - if (chain == NULL) /* Loop ran zero times. */ - (void) regnode(NOTHING); + chain = latest; + c++; + } + if (chain == NULL) { /* Loop ran zero times. */ + chain = reg_node(NOTHING); + if (ret == NULL) + ret = chain; + } + if (c == 1) { + *flagp |= flags&SIMPLE; + } - return(ret); + return(ret); } /* @@ -408,140 +1438,145 @@ int *flagp; * It might seem that this node could be dispensed with entirely, but the * endmarker role is not redundant. */ -static char * -regpiece(flagp) -int *flagp; +STATIC regnode * +S_regpiece(pTHX_ I32 *flagp) { - register char *ret; - register char op; - register char *next; - int flags; - char *origparse = regparse; - int orignpar = regnpar; - char *max; - int iter; - char ch; - - ret = regatom(&flags); - if (ret == NULL) - return(NULL); - - op = *regparse; - - /* Here's a total kludge: if after the atom there's a {\d+,?\d*} - * then we decrement the first number by one and reset our - * parsing back to the beginning of the same atom. If the first number - * is down to 0, decrement the second number instead and fake up - * a ? after it. Given the way this compiler doesn't keep track - * of offsets on the first pass, this is the only way to replicate - * a piece of code. Sigh. - */ - if (op == '{' && regcurly(regparse)) { - next = regparse + 1; - max = Nullch; - while (isdigit(*next) || *next == ',') { - if (*next == ',') { - if (max) - break; - else - max = next; - } - next++; - } - if (*next == '}') { /* got one */ - regsawbracket++; /* remember we clobbered exp */ - if (!max) - max = next; - regparse++; - iter = atoi(regparse); - if (iter > 0) { - ch = *max; - sprintf(regparse,"%.*d", max-regparse, iter - 1); - *max = ch; - if (*max == ',' && atoi(max+1) > 0) { - ch = *next; - sprintf(max+1,"%.*d", next-(max+1), atoi(max+1) - 1); - *next = ch; - } - if (iter != 1 || (*max == ',' || atoi(max+1))) { - regparse = origparse; /* back up input pointer */ - regnpar = orignpar; /* don't make more parens */ - } - else { - regparse = next; - goto nest_check; - } - *flagp = flags; - return ret; - } - if (*max == ',') { - max++; - iter = atoi(max); - if (max == next) { /* any number more? */ - regparse = next; - op = '*'; /* fake up one with a star */ - } - else if (iter > 0) { - op = '?'; /* fake up optional atom */ - ch = *next; - sprintf(max,"%.*d", next-max, iter - 1); - *next = ch; - if (iter == 1) - regparse = next; - else { - regparse = origparse - 1; /* offset ++ below */ - regnpar = orignpar; - } - } - else - fatal("Can't do {n,0}"); - } + dTHR; + register regnode *ret; + register char op; + register char *next; + I32 flags; + char *origparse = PL_regcomp_parse; + char *maxpos; + I32 min; + I32 max = REG_INFTY; + + ret = regatom(&flags); + if (ret == NULL) { + if (flags & TRYAGAIN) + *flagp |= TRYAGAIN; + return(NULL); + } + + op = *PL_regcomp_parse; + + if (op == '{' && regcurly(PL_regcomp_parse)) { + next = PL_regcomp_parse + 1; + maxpos = Nullch; + while (isDIGIT(*next) || *next == ',') { + if (*next == ',') { + if (maxpos) + break; else - fatal("Can't do {0}"); + maxpos = next; } + next++; } + if (*next == '}') { /* got one */ + if (!maxpos) + maxpos = next; + PL_regcomp_parse++; + min = atoi(PL_regcomp_parse); + if (*maxpos == ',') + maxpos++; + else + maxpos = PL_regcomp_parse; + max = atoi(maxpos); + if (!max && *maxpos != '0') + max = REG_INFTY; /* meaning "infinity" */ + else if (max >= REG_INFTY) + FAIL2("Quantifier in {,} bigger than %d", REG_INFTY - 1); + PL_regcomp_parse = next; + nextchar(); + + do_curly: + if ((flags&SIMPLE)) { + PL_regnaughty += 2 + PL_regnaughty / 2; + reginsert(CURLY, ret); + } + else { + PL_regnaughty += 4 + PL_regnaughty; /* compound interest */ + regtail(ret, reg_node(WHILEM)); + if (!SIZE_ONLY && PL_extralen) { + reginsert(LONGJMP,ret); + reginsert(NOTHING,ret); + NEXT_OFF(ret) = 3; /* Go over LONGJMP. */ + } + reginsert(CURLYX,ret); + if (!SIZE_ONLY && PL_extralen) + NEXT_OFF(ret) = 3; /* Go over NOTHING to LONGJMP. */ + regtail(ret, reg_node(NOTHING)); + if (SIZE_ONLY) + PL_extralen += 3; + } + ret->flags = 0; + + if (min > 0) + *flagp = WORST; + if (max > 0) + *flagp |= HASWIDTH; + if (max && max < min) + FAIL("Can't do {n,m} with n > m"); + if (!SIZE_ONLY) { + ARG1_SET(ret, min); + ARG2_SET(ret, max); + } - if (!ISMULT1(op)) { - *flagp = flags; - return(ret); - } - - if (!(flags&HASWIDTH) && op != '?') - FAIL("regexp *+ operand could be empty"); - *flagp = (op != '+') ? (WORST|SPSTART) : (WORST|HASWIDTH); - - if (op == '*' && (flags&SIMPLE)) - reginsert(STAR, ret); - else if (op == '*') { - /* Emit x* as (x&|), where & means "self". */ - reginsert(BRANCH, ret); /* Either x */ - regoptail(ret, regnode(BACK)); /* and loop */ - regoptail(ret, ret); /* back */ - regtail(ret, regnode(BRANCH)); /* or */ - regtail(ret, regnode(NOTHING)); /* null. */ - } else if (op == '+' && (flags&SIMPLE)) - reginsert(PLUS, ret); - else if (op == '+') { - /* Emit x+ as x(&|), where & means "self". */ - next = regnode(BRANCH); /* Either */ - regtail(ret, next); - regtail(regnode(BACK), ret); /* loop back */ - regtail(next, regnode(BRANCH)); /* or */ - regtail(ret, regnode(NOTHING)); /* null. */ - } else if (op == '?') { - /* Emit x? as (x|) */ - reginsert(BRANCH, ret); /* Either x */ - regtail(ret, regnode(BRANCH)); /* or */ - next = regnode(NOTHING); /* null. */ - regtail(ret, next); - regoptail(ret, next); - } - nest_check: - regparse++; - if (ISMULT2(regparse)) - FAIL("nested *?+ in regexp"); + goto nest_check; + } + } + if (!ISMULT1(op)) { + *flagp = flags; return(ret); + } + +#if 0 /* Now runtime fix should be reliable. */ + if (!(flags&HASWIDTH) && op != '?') + FAIL("regexp *+ operand could be empty"); +#endif + + nextchar(); + + *flagp = (op != '+') ? (WORST|SPSTART|HASWIDTH) : (WORST|HASWIDTH); + + if (op == '*' && (flags&SIMPLE)) { + reginsert(STAR, ret); + ret->flags = 0; + PL_regnaughty += 4; + } + else if (op == '*') { + min = 0; + goto do_curly; + } + else if (op == '+' && (flags&SIMPLE)) { + reginsert(PLUS, ret); + ret->flags = 0; + PL_regnaughty += 3; + } + else if (op == '+') { + min = 1; + goto do_curly; + } + else if (op == '?') { + min = 0; max = 1; + goto do_curly; + } + nest_check: + if (ckWARN(WARN_UNSAFE) && !SIZE_ONLY && !(flags&HASWIDTH) && max > REG_INFTY/3) { + Perl_warner(aTHX_ WARN_UNSAFE, "%.*s matches null string many times", + PL_regcomp_parse - origparse, origparse); + } + + if (*PL_regcomp_parse == '?') { + nextchar(); + reginsert(MINMOD, ret); + regtail(ret, ret + NODE_STEP_REGNODE); + } + if (ISMULT2(PL_regcomp_parse)) + FAIL("nested *?+ in regexp"); + + return(ret); } /* @@ -554,689 +1589,1475 @@ int *flagp; * * [Yes, it is worth fixing, some scripts can run twice the speed.] */ -static char * -regatom(flagp) -int *flagp; +STATIC regnode * +S_regatom(pTHX_ I32 *flagp) { - register char *ret; - int flags; + dTHR; + register regnode *ret = 0; + I32 flags; + + *flagp = WORST; /* Tentatively. */ + +tryagain: + switch (*PL_regcomp_parse) { + case '^': + PL_seen_zerolen++; + nextchar(); + if (PL_regflags & PMf_MULTILINE) + ret = reg_node(MBOL); + else if (PL_regflags & PMf_SINGLELINE) + ret = reg_node(SBOL); + else + ret = reg_node(BOL); + break; + case '$': + if (PL_regcomp_parse[1]) + PL_seen_zerolen++; + nextchar(); + if (PL_regflags & PMf_MULTILINE) + ret = reg_node(MEOL); + else if (PL_regflags & PMf_SINGLELINE) + ret = reg_node(SEOL); + else + ret = reg_node(EOL); + break; + case '.': + nextchar(); + if (UTF) { + if (PL_regflags & PMf_SINGLELINE) + ret = reg_node(SANYUTF8); + else + ret = reg_node(ANYUTF8); + *flagp |= HASWIDTH; + } + else { + if (PL_regflags & PMf_SINGLELINE) + ret = reg_node(SANY); + else + ret = reg_node(REG_ANY); + *flagp |= HASWIDTH|SIMPLE; + } + PL_regnaughty++; + break; + case '[': + PL_regcomp_parse++; + ret = (UTF ? regclassutf8() : regclass()); + if (*PL_regcomp_parse != ']') + FAIL("unmatched [] in regexp"); + nextchar(); + *flagp |= HASWIDTH|SIMPLE; + break; + case '(': + nextchar(); + ret = reg(1, &flags); + if (ret == NULL) { + if (flags & TRYAGAIN) + goto tryagain; + return(NULL); + } + *flagp |= flags&(HASWIDTH|SPSTART|SIMPLE); + break; + case '|': + case ')': + if (flags & TRYAGAIN) { + *flagp |= TRYAGAIN; + return NULL; + } + FAIL2("internal urp in regexp at /%s/", PL_regcomp_parse); + /* Supposed to be caught earlier. */ + break; + case '{': + if (!regcurly(PL_regcomp_parse)) { + PL_regcomp_parse++; + goto defchar; + } + /* FALL THROUGH */ + case '?': + case '+': + case '*': + FAIL("?+*{} follows nothing in regexp"); + break; + case '\\': + switch (*++PL_regcomp_parse) { + case 'A': + PL_seen_zerolen++; + ret = reg_node(SBOL); + *flagp |= SIMPLE; + nextchar(); + break; + case 'G': + ret = reg_node(GPOS); + PL_regseen |= REG_SEEN_GPOS; + *flagp |= SIMPLE; + nextchar(); + break; + case 'Z': + ret = reg_node(SEOL); + *flagp |= SIMPLE; + nextchar(); + break; + case 'z': + ret = reg_node(EOS); + *flagp |= SIMPLE; + PL_seen_zerolen++; /* Do not optimize RE away */ + nextchar(); + break; + case 'C': + ret = reg_node(SANY); + *flagp |= HASWIDTH|SIMPLE; + nextchar(); + break; + case 'X': + ret = reg_node(CLUMP); + *flagp |= HASWIDTH; + nextchar(); + if (UTF && !PL_utf8_mark) + is_utf8_mark((U8*)"~"); /* preload table */ + break; + case 'w': + ret = reg_node( + UTF + ? (LOC ? ALNUMLUTF8 : ALNUMUTF8) + : (LOC ? ALNUML : ALNUM)); + *flagp |= HASWIDTH|SIMPLE; + nextchar(); + if (UTF && !PL_utf8_alnum) + is_utf8_alnum((U8*)"a"); /* preload table */ + break; + case 'W': + ret = reg_node( + UTF + ? (LOC ? NALNUMLUTF8 : NALNUMUTF8) + : (LOC ? NALNUML : NALNUM)); + *flagp |= HASWIDTH|SIMPLE; + nextchar(); + if (UTF && !PL_utf8_alnum) + is_utf8_alnum((U8*)"a"); /* preload table */ + break; + case 'b': + PL_seen_zerolen++; + PL_regseen |= REG_SEEN_LOOKBEHIND; + ret = reg_node( + UTF + ? (LOC ? BOUNDLUTF8 : BOUNDUTF8) + : (LOC ? BOUNDL : BOUND)); + *flagp |= SIMPLE; + nextchar(); + if (UTF && !PL_utf8_alnum) + is_utf8_alnum((U8*)"a"); /* preload table */ + break; + case 'B': + PL_seen_zerolen++; + PL_regseen |= REG_SEEN_LOOKBEHIND; + ret = reg_node( + UTF + ? (LOC ? NBOUNDLUTF8 : NBOUNDUTF8) + : (LOC ? NBOUNDL : NBOUND)); + *flagp |= SIMPLE; + nextchar(); + if (UTF && !PL_utf8_alnum) + is_utf8_alnum((U8*)"a"); /* preload table */ + break; + case 's': + ret = reg_node( + UTF + ? (LOC ? SPACELUTF8 : SPACEUTF8) + : (LOC ? SPACEL : SPACE)); + *flagp |= HASWIDTH|SIMPLE; + nextchar(); + if (UTF && !PL_utf8_space) + is_utf8_space((U8*)" "); /* preload table */ + break; + case 'S': + ret = reg_node( + UTF + ? (LOC ? NSPACELUTF8 : NSPACEUTF8) + : (LOC ? NSPACEL : NSPACE)); + *flagp |= HASWIDTH|SIMPLE; + nextchar(); + if (UTF && !PL_utf8_space) + is_utf8_space((U8*)" "); /* preload table */ + break; + case 'd': + ret = reg_node(UTF ? DIGITUTF8 : DIGIT); + *flagp |= HASWIDTH|SIMPLE; + nextchar(); + if (UTF && !PL_utf8_digit) + is_utf8_digit((U8*)"1"); /* preload table */ + break; + case 'D': + ret = reg_node(UTF ? NDIGITUTF8 : NDIGIT); + *flagp |= HASWIDTH|SIMPLE; + nextchar(); + if (UTF && !PL_utf8_digit) + is_utf8_digit((U8*)"1"); /* preload table */ + break; + case 'p': + case 'P': + { /* a lovely hack--pretend we saw [\pX] instead */ + char* oldregxend = PL_regxend; + + if (PL_regcomp_parse[1] == '{') { + PL_regxend = strchr(PL_regcomp_parse, '}'); + if (!PL_regxend) + FAIL("Missing right brace on \\p{}"); + PL_regxend++; + } + else + PL_regxend = PL_regcomp_parse + 2; + PL_regcomp_parse--; - *flagp = WORST; /* Tentatively. */ + ret = regclassutf8(); - switch (*regparse++) { - case '^': - ret = regnode(BOL); - break; - case '$': - ret = regnode(EOL); - break; - case '.': - ret = regnode(ANY); + PL_regxend = oldregxend; + PL_regcomp_parse--; + nextchar(); *flagp |= HASWIDTH|SIMPLE; - break; - case '[': - ret = regclass(); - *flagp |= HASWIDTH|SIMPLE; - break; - case '(': - ret = reg(1, &flags); - if (ret == NULL) - return(NULL); - *flagp |= flags&(HASWIDTH|SPSTART); - break; - case '|': - case ')': - FAIL("internal urp in regexp"); /* Supposed to be caught earlier. */ - break; - case '?': - case '+': - case '*': - FAIL("?+* follows nothing in regexp"); - break; - case '\\': - switch (*regparse) { - case 'w': - ret = regnode(ALNUM); - *flagp |= HASWIDTH|SIMPLE; - regparse++; + } + break; + case 'n': + case 'r': + case 't': + case 'f': + case 'e': + case 'a': + case 'x': + case 'c': + case '0': + goto defchar; + case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + { + I32 num = atoi(PL_regcomp_parse); + + if (num > 9 && num >= PL_regnpar) + goto defchar; + else { + if (!SIZE_ONLY && num > PL_regcomp_rx->nparens) + FAIL("reference to nonexistent group"); + PL_regsawback = 1; + ret = reganode(FOLD + ? (LOC ? REFFL : REFF) + : REF, num); + *flagp |= HASWIDTH; + while (isDIGIT(*PL_regcomp_parse)) + PL_regcomp_parse++; + PL_regcomp_parse--; + nextchar(); + } + } + break; + case '\0': + if (PL_regcomp_parse >= PL_regxend) + FAIL("trailing \\ in regexp"); + /* FALL THROUGH */ + default: + /* Do not generate `unrecognized' warnings here, we fall + back into the quick-grab loop below */ + goto defchar; + } + break; + + case '#': + if (PL_regflags & PMf_EXTENDED) { + while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != '\n') PL_regcomp_parse++; + if (PL_regcomp_parse < PL_regxend) + goto tryagain; + } + /* FALL THROUGH */ + + default: { + register I32 len; + register UV ender; + register char *p; + char *oldp, *s; + I32 numlen; + + PL_regcomp_parse++; + + defchar: + ret = reg_node(FOLD + ? (LOC ? EXACTFL : EXACTF) + : EXACT); + s = (char *) OPERAND(ret); + regc(0, s++); /* save spot for len */ + for (len = 0, p = PL_regcomp_parse - 1; + len < 127 && p < PL_regxend; + len++) + { + oldp = p; + + if (PL_regflags & PMf_EXTENDED) + p = regwhite(p, PL_regxend); + switch (*p) { + case '^': + case '$': + case '.': + case '[': + case '(': + case ')': + case '|': + goto loopdone; + case '\\': + switch (*++p) { + case 'A': + case 'G': + case 'Z': + case 'z': + case 'w': + case 'W': + case 'b': + case 'B': + case 's': + case 'S': + case 'd': + case 'D': + case 'p': + case 'P': + --p; + goto loopdone; + case 'n': + ender = '\n'; + p++; break; - case 'W': - ret = regnode(NALNUM); - *flagp |= HASWIDTH|SIMPLE; - regparse++; + case 'r': + ender = '\r'; + p++; break; - case 'b': - ret = regnode(BOUND); - *flagp |= SIMPLE; - regparse++; + case 't': + ender = '\t'; + p++; break; - case 'B': - ret = regnode(NBOUND); - *flagp |= SIMPLE; - regparse++; + case 'f': + ender = '\f'; + p++; break; - case 's': - ret = regnode(SPACE); - *flagp |= HASWIDTH|SIMPLE; - regparse++; + case 'e': + ender = '\033'; + p++; break; - case 'S': - ret = regnode(NSPACE); - *flagp |= HASWIDTH|SIMPLE; - regparse++; + case 'a': + ender = '\007'; + p++; break; - case 'd': - ret = regnode(DIGIT); - *flagp |= HASWIDTH|SIMPLE; - regparse++; + case 'x': + if (*++p == '{') { + char* e = strchr(p, '}'); + + if (!e) + FAIL("Missing right brace on \\x{}"); + else if (UTF) { + ender = scan_hex(p + 1, e - p, &numlen); + if (numlen + len >= 127) { /* numlen is generous */ + p--; + goto loopdone; + } + p = e + 1; + } + else + FAIL("Can't use \\x{} without 'use utf8' declaration"); + } + else { + ender = scan_hex(p, 2, &numlen); + p += numlen; + } break; - case 'D': - ret = regnode(NDIGIT); - *flagp |= HASWIDTH|SIMPLE; - regparse++; + case 'c': + p++; + ender = UCHARAT(p++); + ender = toCTRL(ender); break; - case 'n': - case 'r': - case 't': - case 'f': - goto defchar; - case '0': case '1': case '2': case '3': case '4': - case '5': case '6': case '7': case '8': case '9': - if (isdigit(regparse[1]) || *regparse == '0') - goto defchar; + case '0': case '1': case '2': case '3':case '4': + case '5': case '6': case '7': case '8':case '9': + if (*p == '0' || + (isDIGIT(p[1]) && atoi(p) >= PL_regnpar) ) { + ender = scan_oct(p, 3, &numlen); + p += numlen; + } else { - ret = regnode(REF + *regparse++ - '0'); - *flagp |= SIMPLE; + --p; + goto loopdone; } break; - case '\0': - if (regparse >= regxend) + case '\0': + if (p >= PL_regxend) FAIL("trailing \\ in regexp"); /* FALL THROUGH */ + default: + if (!SIZE_ONLY && ckWARN(WARN_UNSAFE) && isALPHA(*p)) + Perl_warner(aTHX_ WARN_UNSAFE, + "/%.127s/: Unrecognized escape \\%c passed through", + PL_regprecomp, + *p); + goto normal_default; + } + break; default: - goto defchar; + normal_default: + if ((*p & 0xc0) == 0xc0 && UTF) { + ender = utf8_to_uv((U8*)p, &numlen); + p += numlen; + } + else + ender = *p++; + break; } - break; - default: { - register int len; - register char ender; - register char *p; - char *oldp; - int foo; - - defchar: - ret = regnode(EXACTLY); - regc(0); /* save spot for len */ - for (len=0, p=regparse-1; - len < 127 && p < regxend; - len++) - { - oldp = p; - switch (*p) { - case '^': - case '$': - case '.': - case '[': - case '(': - case ')': - case '|': - goto loopdone; - case '\\': - switch (*++p) { - case 'w': - case 'W': - case 'b': - case 'B': - case 's': - case 'S': - case 'd': - case 'D': - --p; - goto loopdone; - case 'n': - ender = '\n'; - p++; - break; - case 'r': - ender = '\r'; - p++; - break; - case 't': - ender = '\t'; - p++; - break; - case 'f': - ender = '\f'; - p++; - break; - case '0': case '1': case '2': case '3':case '4': - case '5': case '6': case '7': case '8':case '9': - if (isdigit(p[1]) || *p == '0') { - foo = *p - '0'; - if (isdigit(p[1])) - foo = (foo<<3) + *++p - '0'; - if (isdigit(p[1])) - foo = (foo<<3) + *++p - '0'; - ender = foo; - p++; - } - else { - --p; - goto loopdone; - } - break; - case '\0': - if (p >= regxend) - FAIL("trailing \\ in regexp"); - /* FALL THROUGH */ - default: - ender = *p++; - break; - } - break; - default: - ender = *p++; - break; - } - if (regfold && isupper(ender)) - ender = tolower(ender); - if (ISMULT2(p)) { /* Back off on ?+*. */ - if (len) - p = oldp; - else { - len++; - regc(ender); - } - break; - } - regc(ender); - } - loopdone: - regparse = p; - if (len <= 0) - FAIL("internal disaster in regexp"); - *flagp |= HASWIDTH; - if (len == 1) - *flagp |= SIMPLE; - if (regcode != ®dummy) - *OPERAND(ret) = len; - regc('\0'); + if (PL_regflags & PMf_EXTENDED) + p = regwhite(p, PL_regxend); + if (UTF && FOLD) { + if (LOC) + ender = toLOWER_LC_uni(ender); + else + ender = toLOWER_uni(ender); } - break; + if (ISMULT2(p)) { /* Back off on ?+*. */ + if (len) + p = oldp; + else if (ender >= 0x80 && UTF) { + reguni(ender, s, &numlen); + s += numlen; + len += numlen; + } + else { + len++; + regc(ender, s++); + } + break; + } + if (ender >= 0x80 && UTF) { + reguni(ender, s, &numlen); + s += numlen; + len += numlen - 1; + } + else + regc(ender, s++); + } + loopdone: + PL_regcomp_parse = p - 1; + nextchar(); + if (len < 0) + FAIL("internal disaster in regexp"); + if (len > 0) + *flagp |= HASWIDTH; + if (len == 1) + *flagp |= SIMPLE; + if (!SIZE_ONLY) + *OPERAND(ret) = len; + regc('\0', s++); + if (SIZE_ONLY) { + PL_regsize += (len + 2 + sizeof(regnode) - 1) / sizeof(regnode); + } + else { + PL_regcode += (len + 2 + sizeof(regnode) - 1) / sizeof(regnode); + } } + break; + } - return(ret); + return(ret); } -static void -regset(bits,def,c) -char *bits; -int def; -register int c; +STATIC char * +S_regwhite(pTHX_ char *p, char *e) { - if (regcode == ®dummy) - return; - c &= 255; - if (def) - bits[c >> 3] &= ~(1 << (c & 7)); + while (p < e) { + if (isSPACE(*p)) + ++p; + else if (*p == '#') { + do { + p++; + } while (p < e && *p != '\n'); + } else - bits[c >> 3] |= (1 << (c & 7)); + break; + } + return p; } -static char * -regclass() +/* parse POSIX character classes like [[:foo:]] */ +STATIC char* +S_regpposixcc(pTHX_ I32 value) { - register char *bits; - register int class; - register int lastclass; - register int range = 0; - register char *ret; - register int def; - - if (*regparse == '^') { /* Complement of range. */ - ret = regnode(ANYBUT); - regparse++; - def = 0; - } else { - ret = regnode(ANYOF); - def = 255; - } - bits = regcode; - for (class = 0; class < 32; class++) - regc(def); - if (*regparse == ']' || *regparse == '-') - regset(bits,def,lastclass = *regparse++); - while (regparse < regxend && *regparse != ']') { - class = UCHARAT(regparse++); - if (class == '\\') { - class = UCHARAT(regparse++); - switch (class) { - case 'w': - for (class = 'a'; class <= 'z'; class++) - regset(bits,def,class); - for (class = 'A'; class <= 'Z'; class++) - regset(bits,def,class); - for (class = '0'; class <= '9'; class++) - regset(bits,def,class); - regset(bits,def,'_'); - lastclass = 1234; - continue; - case 's': - regset(bits,def,' '); - regset(bits,def,'\t'); - regset(bits,def,'\r'); - regset(bits,def,'\f'); - regset(bits,def,'\n'); - lastclass = 1234; - continue; - case 'd': - for (class = '0'; class <= '9'; class++) - regset(bits,def,class); - lastclass = 1234; - continue; - case 'n': - class = '\n'; - break; - case 'r': - class = '\r'; - break; - case 't': - class = '\t'; - break; - case 'f': - class = '\f'; - break; - case 'b': - class = '\b'; - break; - case '0': case '1': case '2': case '3': case '4': - case '5': case '6': case '7': case '8': case '9': - class -= '0'; - if (isdigit(*regparse)) { - class <<= 3; - class += *regparse++ - '0'; - } - if (isdigit(*regparse)) { - class <<= 3; - class += *regparse++ - '0'; - } - break; - } + dTHR; + char *posixcc = 0; + + if (value == '[' && PL_regcomp_parse + 1 < PL_regxend && + /* I smell either [: or [= or [. -- POSIX has been here, right? */ + (*PL_regcomp_parse == ':' || + *PL_regcomp_parse == '=' || + *PL_regcomp_parse == '.')) { + char c = *PL_regcomp_parse; + char* s = PL_regcomp_parse++; + + while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != c) + PL_regcomp_parse++; + if (PL_regcomp_parse == PL_regxend) + /* Grandfather lone [:, [=, [. */ + PL_regcomp_parse = s; + else { + PL_regcomp_parse++; /* skip over the c */ + if (*PL_regcomp_parse == ']') { + /* Not Implemented Yet. + * (POSIX Extended Character Classes, that is) + * The text between e.g. [: and :] would start + * at s + 1 and stop at regcomp_parse - 2. */ + if (ckWARN(WARN_UNSAFE) && !SIZE_ONLY) + Perl_warner(aTHX_ WARN_UNSAFE, + "Character class syntax [%c %c] is reserved for future extensions", c, c); + PL_regcomp_parse++; /* skip over the ending ] */ + posixcc = s + 1; + } + else { + /* maternal grandfather */ + PL_regcomp_parse = s; + } + } + } + + return posixcc; +} + +STATIC regnode * +S_regclass(pTHX) +{ + dTHR; + register char *opnd, *s; + register I32 value; + register I32 lastvalue = 1234; + register I32 range = 0; + register regnode *ret; + register I32 def; + I32 numlen; + + s = opnd = (char *) OPERAND(PL_regcode); + ret = reg_node(ANYOF); + for (value = 0; value < 33; value++) + regc(0, s++); + if (*PL_regcomp_parse == '^') { /* Complement of range. */ + PL_regnaughty++; + PL_regcomp_parse++; + if (!SIZE_ONLY) + *opnd |= ANYOF_INVERT; + } + if (!SIZE_ONLY) { + PL_regcode += ANY_SKIP; + if (FOLD) + *opnd |= ANYOF_FOLD; + if (LOC) + *opnd |= ANYOF_LOCALE; + } + else { + PL_regsize += ANY_SKIP; + } + if (*PL_regcomp_parse == ']' || *PL_regcomp_parse == '-') + goto skipcond; /* allow 1st char to be ] or - */ + while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != ']') { + skipcond: + value = UCHARAT(PL_regcomp_parse++); + if (value == '[') + (void)regpposixcc(value); /* ignore the return value for now */ + else if (value == '\\') { + value = UCHARAT(PL_regcomp_parse++); + switch (value) { + case 'w': + if (!SIZE_ONLY) { + if (LOC) + *opnd |= ANYOF_ALNUML; + else { + for (value = 0; value < 256; value++) + if (isALNUM(value)) + ANYOF_SET(opnd, value); + } + } + lastvalue = 1234; + continue; + case 'W': + if (!SIZE_ONLY) { + if (LOC) + *opnd |= ANYOF_NALNUML; + else { + for (value = 0; value < 256; value++) + if (!isALNUM(value)) + ANYOF_SET(opnd, value); + } } - if (!range && class == '-' && regparse < regxend && - *regparse != ']') { - range = 1; - continue; + lastvalue = 1234; + continue; + case 's': + if (!SIZE_ONLY) { + if (LOC) + *opnd |= ANYOF_SPACEL; + else { + for (value = 0; value < 256; value++) + if (isSPACE(value)) + ANYOF_SET(opnd, value); + } } - if (range) { - if (lastclass > class) - FAIL("invalid [] range in regexp"); + lastvalue = 1234; + continue; + case 'S': + if (!SIZE_ONLY) { + if (LOC) + *opnd |= ANYOF_NSPACEL; + else { + for (value = 0; value < 256; value++) + if (!isSPACE(value)) + ANYOF_SET(opnd, value); + } } - else - lastclass = class - 1; - range = 0; - for (lastclass++; lastclass <= class; lastclass++) { - regset(bits,def,lastclass); - if (regfold && isupper(lastclass)) - regset(bits,def,tolower(lastclass)); + lastvalue = 1234; + continue; + case 'd': + if (!SIZE_ONLY) { + for (value = '0'; value <= '9'; value++) + ANYOF_SET(opnd, value); + } + lastvalue = 1234; + continue; + case 'D': + if (!SIZE_ONLY) { + for (value = 0; value < '0'; value++) + ANYOF_SET(opnd, value); + for (value = '9' + 1; value < 256; value++) + ANYOF_SET(opnd, value); + } + lastvalue = 1234; + continue; + case 'n': + value = '\n'; + break; + case 'r': + value = '\r'; + break; + case 't': + value = '\t'; + break; + case 'f': + value = '\f'; + break; + case 'b': + value = '\b'; + break; + case 'e': + value = '\033'; + break; + case 'a': + value = '\007'; + break; + case 'x': + value = scan_hex(PL_regcomp_parse, 2, &numlen); + PL_regcomp_parse += numlen; + break; + case 'c': + value = UCHARAT(PL_regcomp_parse++); + value = toCTRL(value); + break; + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + value = scan_oct(--PL_regcomp_parse, 3, &numlen); + PL_regcomp_parse += numlen; + break; + } + } + if (range) { + if (lastvalue > value) + FAIL("invalid [] range in regexp"); + range = 0; + } + else { + lastvalue = value; + if (*PL_regcomp_parse == '-' && PL_regcomp_parse+1 < PL_regxend && + PL_regcomp_parse[1] != ']') { + PL_regcomp_parse++; + range = 1; + continue; /* do it next time */ + } + } + if (!SIZE_ONLY) { +#ifndef ASCIIish + if ((isLOWER(lastvalue) && isLOWER(value)) || + (isUPPER(lastvalue) && isUPPER(value))) + { + I32 i; + if (isLOWER(lastvalue)) { + for (i = lastvalue; i <= value; i++) + if (isLOWER(i)) + ANYOF_SET(opnd, i); + } else { + for (i = lastvalue; i <= value; i++) + if (isUPPER(i)) + ANYOF_SET(opnd, i); } - lastclass = class; + } + else +#endif + for ( ; lastvalue <= value; lastvalue++) + ANYOF_SET(opnd, lastvalue); + } + lastvalue = value; + } + /* optimize case-insensitive simple patterns (e.g. /[a-z]/i) */ + if (!SIZE_ONLY && (*opnd & (0xFF ^ ANYOF_INVERT)) == ANYOF_FOLD) { + for (value = 0; value < 256; ++value) { + if (ANYOF_TEST(opnd, value)) { + I32 cf = PL_fold[value]; + ANYOF_SET(opnd, cf); + } } - if (*regparse != ']') - FAIL("unmatched [] in regexp"); - regparse++; - return ret; + *opnd &= ~ANYOF_FOLD; + } + /* optimize inverted simple patterns (e.g. [^a-z]) */ + if (!SIZE_ONLY && (*opnd & 0xFF) == ANYOF_INVERT) { + for (value = 0; value < 32; ++value) + opnd[1 + value] ^= 0xFF; + *opnd = 0; + } + return ret; } -/* - - regnode - emit a node - */ -static char * /* Location. */ -regnode(op) -char op; +STATIC regnode * +S_regclassutf8(pTHX) { - register char *ret; - register char *ptr; - - ret = regcode; - if (ret == ®dummy) { -#ifdef REGALIGN - if (!(regsize & 1)) - regsize++; -#endif - regsize += 3; - return(ret); + register char *opnd, *e; + register U32 value; + register U32 lastvalue = 123456; + register I32 range = 0; + register regnode *ret; + I32 numlen; + I32 n; + SV *listsv; + U8 flags = 0; + dTHR; + + if (*PL_regcomp_parse == '^') { /* Complement of range. */ + PL_regnaughty++; + PL_regcomp_parse++; + if (!SIZE_ONLY) + flags |= ANYOF_INVERT; + } + if (!SIZE_ONLY) { + if (FOLD) + flags |= ANYOF_FOLD; + if (LOC) + flags |= ANYOF_LOCALE; + listsv = newSVpvn("# comment\n",10); + } + + if (*PL_regcomp_parse == ']' || *PL_regcomp_parse == '-') + goto skipcond; /* allow 1st char to be ] or - */ + + while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != ']') { + skipcond: + value = utf8_to_uv((U8*)PL_regcomp_parse, &numlen); + PL_regcomp_parse += numlen; + + if (value == '[') + (void)regpposixcc(value); /* ignore the return value for now */ + else if (value == '\\') { + value = utf8_to_uv((U8*)PL_regcomp_parse, &numlen); + PL_regcomp_parse += numlen; + switch (value) { + case 'w': + if (!SIZE_ONLY) { + if (LOC) + flags |= ANYOF_ALNUML; + + Perl_sv_catpvf(aTHX_ listsv, "+utf8::IsAlnum\n"); + } + lastvalue = 123456; + continue; + case 'W': + if (!SIZE_ONLY) { + if (LOC) + flags |= ANYOF_NALNUML; + + Perl_sv_catpvf(aTHX_ listsv, + "-utf8::IsAlpha\n-utf8::IsDigit\n0000\t%04x\n%04x\tffff\n", + '_' - 1, + '_' + 1); + } + lastvalue = 123456; + continue; + case 's': + if (!SIZE_ONLY) { + if (LOC) + flags |= ANYOF_SPACEL; + Perl_sv_catpvf(aTHX_ listsv, "+utf8::IsSpace\n"); + if (!PL_utf8_space) + is_utf8_space((U8*)" "); + } + lastvalue = 123456; + continue; + case 'S': + if (!SIZE_ONLY) { + if (LOC) + flags |= ANYOF_NSPACEL; + Perl_sv_catpvf(aTHX_ listsv, + "!utf8::IsSpace\n"); + if (!PL_utf8_space) + is_utf8_space((U8*)" "); + } + lastvalue = 123456; + continue; + case 'd': + if (!SIZE_ONLY) { + Perl_sv_catpvf(aTHX_ listsv, "+utf8::IsDigit\n"); + } + lastvalue = 123456; + continue; + case 'D': + if (!SIZE_ONLY) { + Perl_sv_catpvf(aTHX_ listsv, + "!utf8::IsDigit\n"); + } + lastvalue = 123456; + continue; + case 'p': + case 'P': + if (*PL_regcomp_parse == '{') { + e = strchr(PL_regcomp_parse++, '}'); + if (!e) + FAIL("Missing right brace on \\p{}"); + n = e - PL_regcomp_parse; + } + else { + e = PL_regcomp_parse; + n = 1; + } + if (!SIZE_ONLY) { + if (value == 'p') + Perl_sv_catpvf(aTHX_ listsv, "+utf8::%.*s\n", n, PL_regcomp_parse); + else + Perl_sv_catpvf(aTHX_ listsv, + "!utf8::%.*s\n", n, PL_regcomp_parse); + } + PL_regcomp_parse = e + 1; + lastvalue = 123456; + continue; + case 'n': + value = '\n'; + break; + case 'r': + value = '\r'; + break; + case 't': + value = '\t'; + break; + case 'f': + value = '\f'; + break; + case 'b': + value = '\b'; + break; + case 'e': + value = '\033'; + break; + case 'a': + value = '\007'; + break; + case 'x': + if (*PL_regcomp_parse == '{') { + e = strchr(PL_regcomp_parse++, '}'); + if (!e) + FAIL("Missing right brace on \\x{}"); + value = scan_hex(PL_regcomp_parse, e - PL_regcomp_parse, &numlen); + PL_regcomp_parse = e + 1; + } + else { + value = scan_hex(PL_regcomp_parse, 2, &numlen); + PL_regcomp_parse += numlen; + } + break; + case 'c': + value = UCHARAT(PL_regcomp_parse++); + value = toCTRL(value); + break; + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + value = scan_oct(--PL_regcomp_parse, 3, &numlen); + PL_regcomp_parse += numlen; + break; + } } + if (range) { + if (lastvalue > value) + FAIL("invalid [] range in regexp"); + if (!SIZE_ONLY) + Perl_sv_catpvf(aTHX_ listsv, "%04x\t%04x\n", lastvalue, value); + lastvalue = value; + range = 0; + } + else { + lastvalue = value; + if (*PL_regcomp_parse == '-' && PL_regcomp_parse+1 < PL_regxend && + PL_regcomp_parse[1] != ']') { + PL_regcomp_parse++; + range = 1; + continue; /* do it next time */ + } + if (!SIZE_ONLY) + Perl_sv_catpvf(aTHX_ listsv, "%04x\n", value); + } + } -#ifdef REGALIGN -#ifndef lint - if (!((long)ret & 1)) - *ret++ = 127; -#endif -#endif - ptr = ret; - *ptr++ = op; - *ptr++ = '\0'; /* Null "next" pointer. */ - *ptr++ = '\0'; - regcode = ptr; + ret = reganode(ANYOFUTF8, 0); + + if (!SIZE_ONLY) { + SV *rv = swash_init("utf8", "", listsv, 1, 0); + SvREFCNT_dec(listsv); + n = add_data(1,"s"); + PL_regcomp_rx->data->data[n] = (void*)rv; + ARG1_SET(ret, flags); + ARG2_SET(ret, n); + } + + return ret; +} + +STATIC char* +S_nextchar(pTHX) +{ + dTHR; + char* retval = PL_regcomp_parse++; + + for (;;) { + if (*PL_regcomp_parse == '(' && PL_regcomp_parse[1] == '?' && + PL_regcomp_parse[2] == '#') { + while (*PL_regcomp_parse && *PL_regcomp_parse != ')') + PL_regcomp_parse++; + PL_regcomp_parse++; + continue; + } + if (PL_regflags & PMf_EXTENDED) { + if (isSPACE(*PL_regcomp_parse)) { + PL_regcomp_parse++; + continue; + } + else if (*PL_regcomp_parse == '#') { + while (*PL_regcomp_parse && *PL_regcomp_parse != '\n') + PL_regcomp_parse++; + PL_regcomp_parse++; + continue; + } + } + return retval; + } +} +/* +- reg_node - emit a node +*/ +STATIC regnode * /* Location. */ +S_reg_node(pTHX_ U8 op) +{ + dTHR; + register regnode *ret; + register regnode *ptr; + + ret = PL_regcode; + if (SIZE_ONLY) { + SIZE_ALIGN(PL_regsize); + PL_regsize += 1; return(ret); + } + + NODE_ALIGN_FILL(ret); + ptr = ret; + FILL_ADVANCE_NODE(ptr, op); + PL_regcode = ptr; + + return(ret); } /* - - regc - emit (if appropriate) a byte of code - */ -static void -regc(b) -char b; +- reganode - emit a node with an argument +*/ +STATIC regnode * /* Location. */ +S_reganode(pTHX_ U8 op, U32 arg) { - if (regcode != ®dummy) - *regcode++ = b; - else - regsize++; + dTHR; + register regnode *ret; + register regnode *ptr; + + ret = PL_regcode; + if (SIZE_ONLY) { + SIZE_ALIGN(PL_regsize); + PL_regsize += 2; + return(ret); + } + + NODE_ALIGN_FILL(ret); + ptr = ret; + FILL_ADVANCE_NODE_ARG(ptr, op, arg); + PL_regcode = ptr; + + return(ret); } /* - - reginsert - insert an operator in front of already-emitted operand - * - * Means relocating the operand. - */ -static void -reginsert(op, opnd) -char op; -char *opnd; +- regc - emit (if appropriate) a Unicode character +*/ +STATIC void +S_reguni(pTHX_ UV uv, char* s, I32* lenp) { - register char *src; - register char *dst; - register char *place; + dTHR; + if (SIZE_ONLY) { + U8 tmpbuf[10]; + *lenp = uv_to_utf8(tmpbuf, uv) - tmpbuf; + } + else + *lenp = uv_to_utf8((U8*)s, uv) - (U8*)s; - if (regcode == ®dummy) { -#ifdef REGALIGN - regsize += 4; -#else - regsize += 3; -#endif - return; - } +} - src = regcode; -#ifdef REGALIGN - regcode += 4; -#else - regcode += 3; -#endif - dst = regcode; - while (src > opnd) - *--dst = *--src; - - place = opnd; /* Op node, where operand used to be. */ - *place++ = op; - *place++ = '\0'; - *place++ = '\0'; +/* +- regc - emit (if appropriate) a byte of code +*/ +STATIC void +S_regc(pTHX_ U8 b, char* s) +{ + dTHR; + if (!SIZE_ONLY) + *s = b; } /* - - regtail - set the next-pointer at the end of a node chain - */ -static void -regtail(p, val) -char *p; -char *val; +- reginsert - insert an operator in front of already-emitted operand +* +* Means relocating the operand. +*/ +STATIC void +S_reginsert(pTHX_ U8 op, regnode *opnd) { - register char *scan; - register char *temp; - register int offset; - - if (p == ®dummy) - return; - - /* Find last node. */ - scan = p; - for (;;) { - temp = regnext(scan); - if (temp == NULL) - break; - scan = temp; - } + dTHR; + register regnode *src; + register regnode *dst; + register regnode *place; + register int offset = regarglen[(U8)op]; + +/* (PL_regkind[(U8)op] == CURLY ? EXTRA_STEP_2ARGS : 0); */ + + if (SIZE_ONLY) { + PL_regsize += NODE_STEP_REGNODE + offset; + return; + } + + src = PL_regcode; + PL_regcode += NODE_STEP_REGNODE + offset; + dst = PL_regcode; + while (src > opnd) + StructCopy(--src, --dst, regnode); + + place = opnd; /* Op node, where operand used to be. */ + src = NEXTOPER(place); + FILL_ADVANCE_NODE(place, op); + Zero(src, offset, regnode); +} -#ifdef REGALIGN - offset = val - scan; -#ifndef lint - *(short*)(scan+1) = offset; -#else - offset = offset; -#endif -#else - if (OP(scan) == BACK) - offset = scan - val; - else - offset = val - scan; - *(scan+1) = (offset>>8)&0377; - *(scan+2) = offset&0377; -#endif +/* +- regtail - set the next-pointer at the end of a node chain of p to val. +*/ +STATIC void +S_regtail(pTHX_ regnode *p, regnode *val) +{ + dTHR; + register regnode *scan; + register regnode *temp; + register I32 offset; + + if (SIZE_ONLY) + return; + + /* Find last node. */ + scan = p; + for (;;) { + temp = regnext(scan); + if (temp == NULL) + break; + scan = temp; + } + + if (reg_off_by_arg[OP(scan)]) { + ARG_SET(scan, val - scan); + } + else { + NEXT_OFF(scan) = val - scan; + } } /* - - regoptail - regtail on operand of first argument; nop if operandless - */ -static void -regoptail(p, val) -char *p; -char *val; +- regoptail - regtail on operand of first argument; nop if operandless +*/ +STATIC void +S_regoptail(pTHX_ regnode *p, regnode *val) { - /* "Operandless" and "op != BRANCH" are synonymous in practice. */ - if (p == NULL || p == ®dummy || OP(p) != BRANCH) - return; + dTHR; + /* "Operandless" and "op != BRANCH" are synonymous in practice. */ + if (p == NULL || SIZE_ONLY) + return; + if (PL_regkind[(U8)OP(p)] == BRANCH) { regtail(NEXTOPER(p), val); + } + else if ( PL_regkind[(U8)OP(p)] == BRANCHJ) { + regtail(NEXTOPER(NEXTOPER(p)), val); + } + else + return; } /* - regcurly - a little FSA that accepts {\d+,?\d*} */ -STATIC int -regcurly(s) -register char *s; +STATIC I32 +S_regcurly(pTHX_ register char *s) { if (*s++ != '{') return FALSE; - if (!isdigit(*s)) + if (!isDIGIT(*s)) return FALSE; - while (isdigit(*s)) + while (isDIGIT(*s)) s++; if (*s == ',') s++; - while (isdigit(*s)) + while (isDIGIT(*s)) s++; if (*s != '}') return FALSE; return TRUE; } + +STATIC regnode * +S_dumpuntil(pTHX_ regnode *start, regnode *node, regnode *last, SV* sv, I32 l) +{ #ifdef DEBUGGING + register char op = EXACT; /* Arbitrary non-END op. */ + register regnode *next, *onode; + + while (op != END && (!last || node < last)) { + /* While that wasn't END last time... */ + + NODE_ALIGN(node); + op = OP(node); + if (op == CLOSE) + l--; + next = regnext(node); + /* Where, what. */ + if (OP(node) == OPTIMIZED) + goto after_print; + regprop(sv, node); + PerlIO_printf(Perl_debug_log, "%4d:%*s%s", node - start, + 2*l + 1, "", SvPVX(sv)); + if (next == NULL) /* Next ptr. */ + PerlIO_printf(Perl_debug_log, "(0)"); + else + PerlIO_printf(Perl_debug_log, "(%d)", next - start); + (void)PerlIO_putc(Perl_debug_log, '\n'); + after_print: + if (PL_regkind[(U8)op] == BRANCHJ) { + register regnode *nnode = (OP(next) == LONGJMP + ? regnext(next) + : next); + if (last && nnode > last) + nnode = last; + node = dumpuntil(start, NEXTOPER(NEXTOPER(node)), nnode, sv, l + 1); + } + else if (PL_regkind[(U8)op] == BRANCH) { + node = dumpuntil(start, NEXTOPER(node), next, sv, l + 1); + } + else if ( op == CURLY) { /* `next' might be very big: optimizer */ + node = dumpuntil(start, NEXTOPER(node) + EXTRA_STEP_2ARGS, + NEXTOPER(node) + EXTRA_STEP_2ARGS + 1, sv, l + 1); + } + else if (PL_regkind[(U8)op] == CURLY && op != CURLYX) { + node = dumpuntil(start, NEXTOPER(node) + EXTRA_STEP_2ARGS, + next, sv, l + 1); + } + else if ( op == PLUS || op == STAR) { + node = dumpuntil(start, NEXTOPER(node), NEXTOPER(node) + 1, sv, l + 1); + } + else if (op == ANYOF) { + node = NEXTOPER(node); + node += ANY_SKIP; + } + else if (PL_regkind[(U8)op] == EXACT) { + /* Literal string, where present. */ + node += ((*OPERAND(node)) + 2 + sizeof(regnode) - 1) / sizeof(regnode); + node = NEXTOPER(node); + } + else { + node = NEXTOPER(node); + node += regarglen[(U8)op]; + } + if (op == CURLYX || op == OPEN) + l++; + else if (op == WHILEM) + l--; + } +#endif /* DEBUGGING */ + return node; +} /* - - regdump - dump a regexp onto stderr in vaguely comprehensible form + - regdump - dump a regexp onto Perl_debug_log in vaguely comprehensible form */ void -regdump(r) -regexp *r; +Perl_regdump(pTHX_ regexp *r) { - register char *s; - register char op = EXACTLY; /* Arbitrary non-END op. */ - register char *next; - extern char *index(); - - - s = r->program + 1; - while (op != END) { /* While that wasn't END last time... */ -#ifdef REGALIGN - if (!((long)s & 1)) - s++; -#endif - op = OP(s); - fprintf(stderr,"%2d%s", s-r->program, regprop(s)); /* Where, what. */ - next = regnext(s); - if (next == NULL) /* Next ptr. */ - fprintf(stderr,"(0)"); - else - fprintf(stderr,"(%d)", (s-r->program)+(next-s)); - s += 3; - if (op == ANYOF || op == ANYBUT) { - s += 32; - } - if (op == EXACTLY) { - /* Literal string, where present. */ - s++; - while (*s != '\0') { - (void)putchar(*s); - s++; - } - s++; - } - (void)putchar('\n'); - } - - /* Header fields of interest. */ - if (r->regstart) - fprintf(stderr,"start `%s' ", r->regstart->str_ptr); - if (r->regstclass) - fprintf(stderr,"stclass `%s' ", regprop(r->regstclass)); - if (r->reganch) - fprintf(stderr,"anchored "); - if (r->regmust != NULL) - fprintf(stderr,"must have \"%s\" back %d ", r->regmust->str_ptr, - r->regback); - fprintf(stderr,"\n"); +#ifdef DEBUGGING + dTHR; + SV *sv = sv_newmortal(); + + (void)dumpuntil(r->program, r->program + 1, NULL, sv, 0); + + /* Header fields of interest. */ + if (r->anchored_substr) + PerlIO_printf(Perl_debug_log, "anchored `%s%s%s'%s at %d ", + PL_colors[0], + SvPVX(r->anchored_substr), + PL_colors[1], + SvTAIL(r->anchored_substr) ? "$" : "", + r->anchored_offset); + if (r->float_substr) + PerlIO_printf(Perl_debug_log, "floating `%s%s%s'%s at %d..%u ", + PL_colors[0], + SvPVX(r->float_substr), + PL_colors[1], + SvTAIL(r->float_substr) ? "$" : "", + r->float_min_offset, r->float_max_offset); + if (r->check_substr) + PerlIO_printf(Perl_debug_log, + r->check_substr == r->float_substr + ? "(checking floating" : "(checking anchored"); + if (r->reganch & ROPT_NOSCAN) + PerlIO_printf(Perl_debug_log, " noscan"); + if (r->reganch & ROPT_CHECK_ALL) + PerlIO_printf(Perl_debug_log, " isall"); + if (r->check_substr) + PerlIO_printf(Perl_debug_log, ") "); + + if (r->regstclass) { + regprop(sv, r->regstclass); + PerlIO_printf(Perl_debug_log, "stclass `%s' ", SvPVX(sv)); + } + if (r->reganch & ROPT_ANCH) { + PerlIO_printf(Perl_debug_log, "anchored"); + if (r->reganch & ROPT_ANCH_BOL) + PerlIO_printf(Perl_debug_log, "(BOL)"); + if (r->reganch & ROPT_ANCH_MBOL) + PerlIO_printf(Perl_debug_log, "(MBOL)"); + if (r->reganch & ROPT_ANCH_GPOS) + PerlIO_printf(Perl_debug_log, "(GPOS)"); + PerlIO_putc(Perl_debug_log, ' '); + } + if (r->reganch & ROPT_GPOS_SEEN) + PerlIO_printf(Perl_debug_log, "GPOS "); + if (r->reganch & ROPT_SKIP) + PerlIO_printf(Perl_debug_log, "plus "); + if (r->reganch & ROPT_IMPLICIT) + PerlIO_printf(Perl_debug_log, "implicit "); + PerlIO_printf(Perl_debug_log, "minlen %ld ", (long) r->minlen); + if (r->reganch & ROPT_EVAL_SEEN) + PerlIO_printf(Perl_debug_log, "with eval "); + PerlIO_printf(Perl_debug_log, "\n"); +#endif /* DEBUGGING */ } /* - - regprop - printable representation of opcode - */ -char * -regprop(op) -char *op; +- regprop - printable representation of opcode +*/ +void +Perl_regprop(pTHX_ SV *sv, regnode *o) { - register char *p; - - (void) strcpy(buf, ":"); +#ifdef DEBUGGING + dTHR; + register int k; + + sv_setpvn(sv, "", 0); + if (OP(o) >= reg_num) /* regnode.type is unsigned */ + FAIL("corrupted regexp opcode"); + sv_catpv(sv, (char*)reg_name[OP(o)]); /* Take off const! */ + + k = PL_regkind[(U8)OP(o)]; + + if (k == EXACT) + Perl_sv_catpvf(aTHX_ sv, " <%s%s%s>", PL_colors[0], OPERAND(o) + 1, PL_colors[1]); + else if (k == CURLY) { + if (OP(o) == CURLYM || OP(o) == CURLYN) + Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* Parenth number */ + Perl_sv_catpvf(aTHX_ sv, " {%d,%d}", ARG1(o), ARG2(o)); + } + else if (k == REF || k == OPEN || k == CLOSE || k == GROUPP ) + Perl_sv_catpvf(aTHX_ sv, "%d", ARG(o)); /* Parenth number */ + else if (k == LOGICAL) + Perl_sv_catpvf(aTHX_ sv, "[%d]", ARG(o)); /* 2: embedded, otherwise 1 */ + else if (k == BRANCHJ && (OP(o) == UNLESSM || OP(o) == IFMATCH)) + Perl_sv_catpvf(aTHX_ sv, "[-%d]", o->flags); +#endif /* DEBUGGING */ +} - switch (OP(op)) { - case BOL: - p = "BOL"; - break; - case EOL: - p = "EOL"; - break; - case ANY: - p = "ANY"; - break; - case ANYOF: - p = "ANYOF"; - break; - case ANYBUT: - p = "ANYBUT"; - break; - case BRANCH: - p = "BRANCH"; - break; - case EXACTLY: - p = "EXACTLY"; - break; - case NOTHING: - p = "NOTHING"; - break; - case BACK: - p = "BACK"; - break; - case END: - p = "END"; - break; - case ALNUM: - p = "ALNUM"; - break; - case NALNUM: - p = "NALNUM"; - break; - case BOUND: - p = "BOUND"; - break; - case NBOUND: - p = "NBOUND"; - break; - case SPACE: - p = "SPACE"; - break; - case NSPACE: - p = "NSPACE"; - break; - case DIGIT: - p = "DIGIT"; - break; - case NDIGIT: - p = "NDIGIT"; - break; - case REF: - case REF+1: - case REF+2: - case REF+3: - case REF+4: - case REF+5: - case REF+6: - case REF+7: - case REF+8: - case REF+9: - (void)sprintf(buf+strlen(buf), "REF%d", OP(op)-REF); - p = NULL; - break; - case OPEN+1: - case OPEN+2: - case OPEN+3: - case OPEN+4: - case OPEN+5: - case OPEN+6: - case OPEN+7: - case OPEN+8: - case OPEN+9: - (void)sprintf(buf+strlen(buf), "OPEN%d", OP(op)-OPEN); - p = NULL; +void +Perl_pregfree(pTHX_ struct regexp *r) +{ + dTHR; + if (!r || (--r->refcnt > 0)) + return; + if (r->precomp) + Safefree(r->precomp); + if (RX_MATCH_COPIED(r)) + Safefree(r->subbeg); + if (r->substrs) { + if (r->anchored_substr) + SvREFCNT_dec(r->anchored_substr); + if (r->float_substr) + SvREFCNT_dec(r->float_substr); + Safefree(r->substrs); + } + if (r->data) { + int n = r->data->count; + AV* new_comppad = NULL; + AV* old_comppad; + SV** old_curpad; + + while (--n >= 0) { + switch (r->data->what[n]) { + case 's': + SvREFCNT_dec((SV*)r->data->data[n]); break; - case CLOSE+1: - case CLOSE+2: - case CLOSE+3: - case CLOSE+4: - case CLOSE+5: - case CLOSE+6: - case CLOSE+7: - case CLOSE+8: - case CLOSE+9: - (void)sprintf(buf+strlen(buf), "CLOSE%d", OP(op)-CLOSE); - p = NULL; + case 'p': + new_comppad = (AV*)r->data->data[n]; break; - case STAR: - p = "STAR"; + case 'o': + if (new_comppad == NULL) + Perl_croak(aTHX_ "panic: pregfree comppad"); + old_comppad = PL_comppad; + old_curpad = PL_curpad; + PL_comppad = new_comppad; + PL_curpad = AvARRAY(new_comppad); + op_free((OP_4tree*)r->data->data[n]); + PL_comppad = old_comppad; + PL_curpad = old_curpad; + SvREFCNT_dec((SV*)new_comppad); + new_comppad = NULL; break; - case PLUS: - p = "PLUS"; + case 'n': break; - default: - FAIL("corrupted regexp opcode"); + default: + FAIL2("panic: regfree data code '%c'", r->data->what[n]); + } } - if (p != NULL) - (void) strcat(buf, p); - return(buf); + Safefree(r->data->what); + Safefree(r->data); + } + Safefree(r->startp); + Safefree(r->endp); + Safefree(r); } -#endif /* DEBUGGING */ -regfree(r) -struct regexp *r; +/* + - regnext - dig the "next" pointer out of a node + * + * [Note, when REGALIGN is defined there are two places in regmatch() + * that bypass this code for speed.] + */ +regnode * +Perl_regnext(pTHX_ register regnode *p) { - if (r->precomp) - Safefree(r->precomp); - if (r->subbase) - Safefree(r->subbase); - if (r->regmust) - str_free(r->regmust); - if (r->regstart) - str_free(r->regstart); - Safefree(r); + dTHR; + register I32 offset; + + if (p == &PL_regdummy) + return(NULL); + + offset = (reg_off_by_arg[OP(p)] ? ARG(p) : NEXT_OFF(p)); + if (offset == 0) + return(NULL); + + return(p+offset); +} + +STATIC void +S_re_croak2(pTHX_ const char* pat1,const char* pat2,...) +{ + va_list args; + STRLEN l1 = strlen(pat1); + STRLEN l2 = strlen(pat2); + char buf[512]; + SV *msv; + char *message; + + if (l1 > 510) + l1 = 510; + if (l1 + l2 > 510) + l2 = 510 - l1; + Copy(pat1, buf, l1 , char); + Copy(pat2, buf + l1, l2 , char); + buf[l1 + l2] = '\n'; + buf[l1 + l2 + 1] = '\0'; +#ifdef I_STDARG + /* ANSI variant takes additional second argument */ + va_start(args, pat2); +#else + va_start(args); +#endif + msv = mess(buf, &args); + va_end(args); + message = SvPV(msv,l1); + if (l1 > 512) + l1 = 512; + Copy(message, buf, l1 , char); + buf[l1] = '\0'; /* Overwrite \n */ + Perl_croak(aTHX_ "%s", buf); +} + +/* XXX Here's a total kludge. But we need to re-enter for swash routines. */ + +void +Perl_save_re_context(pTHX) +{ + dTHR; + SAVEPPTR(PL_bostr); + SAVEPPTR(PL_regprecomp); /* uncompiled string. */ + SAVEI32(PL_regnpar); /* () count. */ + SAVEI32(PL_regsize); /* Code size. */ + SAVEI16(PL_regflags); /* are we folding, multilining? */ + SAVEPPTR(PL_reginput); /* String-input pointer. */ + SAVEPPTR(PL_regbol); /* Beginning of input, for ^ check. */ + SAVEPPTR(PL_regeol); /* End of input, for $ check. */ + SAVESPTR(PL_regstartp); /* Pointer to startp array. */ + SAVESPTR(PL_regendp); /* Ditto for endp. */ + SAVESPTR(PL_reglastparen); /* Similarly for lastparen. */ + SAVEPPTR(PL_regtill); /* How far we are required to go. */ + SAVEI32(PL_regprev); /* char before regbol, \n if none */ + SAVESPTR(PL_reg_start_tmp); /* from regexec.c */ + PL_reg_start_tmp = 0; + SAVEFREEPV(PL_reg_start_tmp); + SAVEI32(PL_reg_start_tmpl); /* from regexec.c */ + PL_reg_start_tmpl = 0; + SAVESPTR(PL_regdata); + SAVEI32(PL_reg_flags); /* from regexec.c */ + SAVEI32(PL_reg_eval_set); /* from regexec.c */ + SAVEI32(PL_regnarrate); /* from regexec.c */ + SAVESPTR(PL_regprogram); /* from regexec.c */ + SAVEINT(PL_regindent); /* from regexec.c */ + SAVESPTR(PL_regcc); /* from regexec.c */ + SAVESPTR(PL_curcop); + SAVESPTR(PL_regcomp_rx); /* from regcomp.c */ + SAVEI32(PL_regseen); /* from regcomp.c */ + SAVEI32(PL_regsawback); /* Did we see \1, ...? */ + SAVEI32(PL_regnaughty); /* How bad is this pattern? */ + SAVESPTR(PL_regcode); /* Code-emit pointer; ®dummy = don't */ + SAVEPPTR(PL_regxend); /* End of input for compile */ + SAVEPPTR(PL_regcomp_parse); /* Input-scan pointer. */ + SAVESPTR(PL_reg_call_cc); /* from regexec.c */ + SAVESPTR(PL_reg_re); /* from regexec.c */ + SAVEPPTR(PL_reg_ganch); /* from regexec.c */ + SAVESPTR(PL_reg_sv); /* from regexec.c */ + SAVESPTR(PL_reg_magic); /* from regexec.c */ + SAVEI32(PL_reg_oldpos); /* from regexec.c */ + SAVESPTR(PL_reg_oldcurpm); /* from regexec.c */ + SAVESPTR(PL_reg_curpm); /* from regexec.c */ +#ifdef DEBUGGING + SAVEPPTR(PL_reg_starttry); /* from regexec.c */ +#endif }