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freebsd-dev/contrib/perl5/regcomp.c

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Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
/* 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!
*/
/* Additional note: this code is very heavily munged from Henry's version
* in places. In some spots I've traded clarity for efficiency, so don't
* blame Henry for some of the lack of readability.
*/
/* The names of the functions have been changed from regcomp and
* regexec to pregcomp and pregexec in order to avoid conflicts
* with the POSIX routines of the same names.
*/
#ifdef PERL_EXT_RE_BUILD
/* 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
#endif
/*SUPPRESS 112*/
/*
* pregcomp and pregexec -- regsub and regerror are not used in perl
*
* Copyright (c) 1986 by University of Toronto.
* Written by Henry Spencer. Not derived from licensed software.
*
* Permission is granted to anyone to use this software for any
* purpose on any computer system, and to redistribute it freely,
* subject to the following restrictions:
*
* 1. The author is not responsible for the consequences of use of
* this software, no matter how awful, even if they arise
* from defects in it.
*
* 2. The origin of this software must not be misrepresented, either
* by explicit claim or by omission.
*
* 3. Altered versions must be plainly marked as such, and must not
* be misrepresented as being the original software.
*
*
**** Alterations to Henry's code are...
****
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
**** Copyright (c) 1991-1999, Larry Wall
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
****
**** 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"
#include "perl.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
#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 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. */
/*
* Forward declarations for pregcomp()'s friends.
*/
#ifndef PERL_OBJECT
static regnode *reg _((I32, I32 *));
static regnode *reganode _((U8, U32));
static regnode *regatom _((I32 *));
static regnode *regbranch _((I32 *, I32));
static void regc _((U8, char *));
static regnode *regclass _((void));
STATIC I32 regcurly _((char *));
static regnode *reg_node _((U8));
static regnode *regpiece _((I32 *));
static void reginsert _((U8, regnode *));
static void regoptail _((regnode *, regnode *));
static void regtail _((regnode *, regnode *));
static char* regwhite _((char *, char *));
static char* nextchar _((void));
static void re_croak2 _((const char* pat1,const char* pat2,...)) __attribute__((noreturn));
#endif
/* Length of a variant. */
#ifndef PERL_OBJECT
typedef struct {
I32 len_min;
I32 len_delta;
I32 pos_min;
I32 pos_delta;
SV *last_found;
I32 last_end; /* min value, <0 unless valid. */
I32 last_start_min;
I32 last_start_max;
SV **longest; /* Either &l_fixed, or &l_float. */
SV *longest_fixed;
I32 offset_fixed;
SV *longest_float;
I32 offset_float_min;
I32 offset_float_max;
I32 flags;
} scan_data_t;
#endif
static scan_data_t zero_scan_data = { 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
STATIC void
scan_commit(scan_data_t *data)
{
STRLEN l = SvCUR(data->last_found);
STRLEN old_l = SvCUR(*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
study_chunk(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);
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
int is_inf_internal = 0; /* The studied chunk is infinite */
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
I32 is_par = OP(scan) == OPEN ? ARG(scan) : 0;
scan_data_t data_fake;
while (scan && OP(scan) != END && scan < last) {
/* Peephole optimizer: */
if (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 &&
( 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 (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 (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))
&& ((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)
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
is_inf = is_inf_internal = 1;
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
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) {
min += *OPERAND(scan);
if (flags & SCF_DO_SUBSTR) { /* Update longest substr. */
I32 l = *OPERAND(scan);
/* 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), l);
data->last_end = data->pos_min + l;
data->pos_min += l; /* As in the first entry. */
data->flags &= ~SF_BEFORE_EOL;
}
} else if (regkind[(U8)OP(scan)] == EXACT) {
if (flags & SCF_DO_SUBSTR)
scan_commit(data);
min += *OPERAND(scan);
if (data && (flags & SCF_DO_SUBSTR))
data->pos_min += *OPERAND(scan);
} else if (strchr(varies,OP(scan))) {
I32 mincount, maxcount, minnext, deltanext, pos_before, fl;
regnode *oscan = scan;
switch (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:
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
is_inf = is_inf_internal = 1;
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
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 (PL_dowarn && (minnext + deltanext == 0)
&& !(data->flags & (SF_HAS_PAR|SF_IN_PAR))
&& maxcount <= 10000) /* Complement check for big count */
warn("Strange *+?{} on zero-length expression");
min += minnext * mincount;
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
is_inf_internal |= (maxcount == REG_INFTY
&& (minnext + deltanext) > 0
|| deltanext == I32_MAX);
is_inf |= is_inf_internal;
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
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(simple,OP(nxt))
&& !(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);
l -= b - data->last_start_min;
/* Get the added string: */
last_str = newSVpv(s + b - data->last_start_min, 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 - SvCUR(last_str);
data->last_start_max = is_inf
? I32_MAX
: data->pos_min + data->pos_delta
- SvCUR(last_str);
}
data->longest = &(data->longest_float);
}
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
SvREFCNT_dec(last_str);
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
}
if (data && (fl & SF_HAS_EVAL))
data->flags |= SF_HAS_EVAL;
optimize_curly_tail:
if (OP(oscan) != CURLYX) {
while (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);
}
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
is_inf = is_inf_internal = 1;
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
break;
}
} else if (strchr(simple,OP(scan))) {
if (flags & SCF_DO_SUBSTR) {
scan_commit(data);
data->pos_min++;
}
min++;
} else if (regkind[(U8)OP(scan)] == EOL && flags & SCF_DO_SUBSTR) {
data->flags |= (OP(scan) == MEOL
? SF_BEFORE_MEOL
: SF_BEFORE_SEOL);
} else if (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: zero-length, ignore. */
scan = regnext(scan);
}
finish:
*scanp = scan;
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
*deltap = is_inf_internal ? I32_MAX : delta;
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
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
add_data(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;
}
/*
- 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
* place to put the code. So we cheat: we compile it twice, once with code
* generation turned off and size counting turned on, and once "for real".
* This also means that we don't allocate space until we are sure that the
* thing really will compile successfully, and we never have to move the
* code and thus invalidate pointers into it. (Note that it has to be in
* one piece because free() must be able to free it all.) [NB: not true in perl]
*
* Beware that the optimization-preparation code in here knows about some
* of the structure of the compiled regexp. [I'll say.]
*/
regexp *
pregcomp(char *exp, char *xend, PMOP *pm)
{
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");
PL_regprecomp = savepvn(exp, xend - exp);
DEBUG_r(PerlIO_printf(Perl_debug_log, "compiling RE `%*s'\n",
xend - exp, PL_regprecomp));
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)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));
DEBUG_r(
if (!PL_colorset) {
int i = 0;
char *s = PerlEnv_getenv("TERMCAP_COLORS");
PL_colorset = 1;
if (s) {
PL_colors[0] = s = savepv(s);
while (++i < 4) {
s = strchr(s, '\t');
if (!s)
FAIL("Not enough TABs in TERMCAP_COLORS");
*s = '\0';
PL_colors[i] = ++s;
}
} else {
while (i < 4)
PL_colors[i++] = "";
}
/* Reset colors: */
PerlIO_printf(Perl_debug_log, "%s%s%s%s",
PL_colors[0],PL_colors[1],PL_colors[2],PL_colors[3]);
}
);
/* 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 = r->subbase = NULL;
r->nparens = PL_regnpar - 1; /* set early to validate backrefs */
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)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;
pm->op_pmflags = PL_regflags;
r->regstclass = NULL;
r->naughty = PL_regnaughty >= 10; /* Probably an expensive pattern. */
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) ||
(regkind[(U8)OP(first)] == CURLY && ARG1(first) > 0) ) {
if (OP(first) == PLUS)
sawplus = 1;
else
first += regarglen[(U8)OP(first)];
first = NEXTOPER(first);
}
/* Starting-point info. */
again:
if (OP(first) == EXACT); /* Empty, get anchored substr later. */
else if (strchr(simple+2,OP(first)))
r->regstclass = first;
else if (regkind[(U8)OP(first)] == BOUND ||
regkind[(U8)OP(first)] == NBOUND)
r->regstclass = first;
else if (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 &&
regkind[(U8)OP(NEXTOPER(first))] == 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 = newSVpv("",0);
data.longest_float = newSVpv("",0);
data.last_found = newSVpv("",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 = SvCUR(data.longest_float);
if (longest_float_length
|| (data.flags & SF_FL_BEFORE_EOL
&& (!(data.flags & SF_FL_BEFORE_MEOL)
|| (PL_regflags & PMf_MULTILINE)))) {
if (SvCUR(data.longest_fixed)
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
&& data.offset_fixed == data.offset_float_min
&& SvCUR(data.longest_fixed) == SvCUR(data.longest_float))
goto remove_float; /* Like in (a)+. */
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
r->float_substr = data.longest_float;
r->float_min_offset = data.offset_float_min;
r->float_max_offset = data.offset_float_max;
fbm_compile(r->float_substr, 0);
BmUSEFUL(r->float_substr) = 100;
if (data.flags & SF_FL_BEFORE_EOL /* Cannot have SEOL and MULTI */
&& (!(data.flags & SF_FL_BEFORE_MEOL)
|| (PL_regflags & PMf_MULTILINE)))
SvTAIL_on(r->float_substr);
} else {
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
remove_float:
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
r->float_substr = Nullsv;
SvREFCNT_dec(data.longest_float);
longest_float_length = 0;
}
longest_fixed_length = SvCUR(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)))) {
r->anchored_substr = data.longest_fixed;
r->anchored_offset = data.offset_fixed;
fbm_compile(r->anchored_substr, 0);
BmUSEFUL(r->anchored_substr) = 100;
if (data.flags & SF_FIX_BEFORE_EOL /* Cannot have SEOL and MULTI */
&& (!(data.flags & SF_FIX_BEFORE_MEOL)
|| (PL_regflags & PMf_MULTILINE)))
SvTAIL_on(r->anchored_substr);
} else {
r->anchored_substr = Nullsv;
SvREFCNT_dec(data.longest_fixed);
longest_fixed_length = 0;
}
/* 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, char*);
Newz(1002, r->endp, PL_regnpar, char*);
DEBUG_r(regdump(r));
return(r);
}
/*
- reg - regular expression, i.e. main body or parenthesized thing
*
* Caller must absorb opening parenthesis.
*
* Combining parenthesis handling with the base level of regular expression
* is a trifle forced, but the need to tie the tails of the branches to what
* follows makes it hard to avoid.
*/
STATIC regnode *
reg(I32 paren, I32 *flagp)
/* paren: Parenthesized? 0=top, 1=(, inside: changed to letter. */
{
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;
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 '{':
{
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 = newSVpv(s, PL_regcomp_parse - 1 - s);
else
sv = newSVpv("", 0);
rop = sv_compile_2op(sv, &sop, "re", &av);
n = add_data(3, "nso");
PL_regcomp_rx->data->data[n] = (void*)rop;
PL_regcomp_rx->data->data[n+1] = (void*)av;
PL_regcomp_rx->data->data[n+2] = (void*)sop;
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();
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);
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();
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
if (flags&HASWIDTH)
*flagp |= HASWIDTH;
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
if (c == '|') {
lastbr = reganode(IFTHEN, 0); /* Fake one for optimizer. */
regbranch(&flags, 1);
regtail(ret, lastbr);
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
if (flags&HASWIDTH)
*flagp |= HASWIDTH;
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
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
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. */
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);
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[] = "=!<,>";
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));
}
}
/* Check for proper termination. */
if (paren && (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 */
}
if (paren != 0) {
PL_regflags = oregflags;
}
return(ret);
}
/*
- regbranch - one alternative of an | operator
*
* Implements the concatenation operator.
*/
STATIC regnode *
regbranch(I32 *flagp, I32 first)
{
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);
}
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);
}
/*
- regpiece - something followed by possible [*+?]
*
* Note that the branching code sequences used for ? and the general cases
* of * and + are somewhat optimized: they use the same NOTHING node as
* both the endmarker for their branch list and the body of the last branch.
* It might seem that this node could be dispensed with entirely, but the
* endmarker role is not redundant.
*/
STATIC regnode *
regpiece(I32 *flagp)
{
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
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);
}
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 (PL_dowarn && !SIZE_ONLY && !(flags&HASWIDTH) && max > 10000) {
warn("%.*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);
}
/*
- regatom - the lowest level
*
* Optimization: gobbles an entire sequence of ordinary characters so that
* it can turn them into a single node, which is smaller to store and
* faster to run. Backslashed characters are exceptions, each becoming a
* separate node; the code is simpler that way and it's not worth fixing.
*
* [Yes, it is worth fixing, some scripts can run twice the speed.]
*/
STATIC regnode *
regatom(I32 *flagp)
{
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 (PL_regflags & PMf_SINGLELINE)
ret = reg_node(SANY);
else
ret = reg_node(ANY);
PL_regnaughty++;
*flagp |= HASWIDTH|SIMPLE;
break;
case '[':
PL_regcomp_parse++;
ret = regclass();
*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 'w':
ret = reg_node((PL_regflags & PMf_LOCALE) ? ALNUML : ALNUM);
*flagp |= HASWIDTH|SIMPLE;
nextchar();
break;
case 'W':
ret = reg_node((PL_regflags & PMf_LOCALE) ? NALNUML : NALNUM);
*flagp |= HASWIDTH|SIMPLE;
nextchar();
break;
case 'b':
PL_seen_zerolen++;
ret = reg_node((PL_regflags & PMf_LOCALE) ? BOUNDL : BOUND);
*flagp |= SIMPLE;
nextchar();
break;
case 'B':
PL_seen_zerolen++;
ret = reg_node((PL_regflags & PMf_LOCALE) ? NBOUNDL : NBOUND);
*flagp |= SIMPLE;
nextchar();
break;
case 's':
ret = reg_node((PL_regflags & PMf_LOCALE) ? SPACEL : SPACE);
*flagp |= HASWIDTH|SIMPLE;
nextchar();
break;
case 'S':
ret = reg_node((PL_regflags & PMf_LOCALE) ? NSPACEL : NSPACE);
*flagp |= HASWIDTH|SIMPLE;
nextchar();
break;
case 'd':
ret = reg_node(DIGIT);
*flagp |= HASWIDTH|SIMPLE;
nextchar();
break;
case 'D':
ret = reg_node(NDIGIT);
*flagp |= HASWIDTH|SIMPLE;
nextchar();
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((PL_regflags & PMf_FOLD)
? ((PL_regflags & PMf_LOCALE) ? 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:
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 U8 ender;
register char *p;
char *oldp, *s;
I32 numlen;
PL_regcomp_parse++;
defchar:
ret = reg_node((PL_regflags & PMf_FOLD)
? ((PL_regflags & PMf_LOCALE) ? 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':
--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 'e':
ender = '\033';
p++;
break;
case 'a':
ender = '\007';
p++;
break;
case 'x':
ender = scan_hex(++p, 2, &numlen);
p += numlen;
break;
case 'c':
p++;
ender = UCHARAT(p++);
ender = toCTRL(ender);
break;
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 {
--p;
goto loopdone;
}
break;
case '\0':
if (p >= PL_regxend)
FAIL("trailing \\ in regexp");
/* FALL THROUGH */
default:
ender = *p++;
break;
}
break;
default:
ender = *p++;
break;
}
if (PL_regflags & PMf_EXTENDED)
p = regwhite(p, PL_regxend);
if (ISMULT2(p)) { /* Back off on ?+*. */
if (len)
p = oldp;
else {
len++;
regc(ender, s++);
}
break;
}
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);
}
STATIC char *
regwhite(char *p, char *e)
{
while (p < e) {
if (isSPACE(*p))
++p;
else if (*p == '#') {
do {
p++;
} while (p < e && *p != '\n');
}
else
break;
}
return p;
}
STATIC regnode *
regclass(void)
{
dTHR;
register char *opnd, *s;
register I32 Class;
register I32 lastclass = 1234;
register I32 range = 0;
register regnode *ret;
register I32 def;
I32 numlen;
s = opnd = (char *) OPERAND(PL_regcode);
ret = reg_node(ANYOF);
for (Class = 0; Class < 33; Class++)
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 (PL_regflags & PMf_FOLD)
*opnd |= ANYOF_FOLD;
if (PL_regflags & PMf_LOCALE)
*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:
Class = UCHARAT(PL_regcomp_parse++);
if (Class == '[' && 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 posixccc = *PL_regcomp_parse;
char* posixccs = PL_regcomp_parse++;
while (PL_regcomp_parse < PL_regxend && *PL_regcomp_parse != posixccc)
PL_regcomp_parse++;
if (PL_regcomp_parse == PL_regxend)
/* Grandfather lone [:, [=, [. */
PL_regcomp_parse = posixccs;
else {
PL_regcomp_parse++; /* skip over the posixccc */
if (*PL_regcomp_parse == ']') {
/* Not Implemented Yet.
* (POSIX Extended Character Classes, that is)
* The text between e.g. [: and :] would start
* at posixccs + 1 and stop at regcomp_parse - 2. */
if (PL_dowarn && !SIZE_ONLY)
warn("Character class syntax [%c %c] is reserved for future extensions", posixccc, posixccc);
PL_regcomp_parse++; /* skip over the ending ] */
}
}
}
if (Class == '\\') {
Class = UCHARAT(PL_regcomp_parse++);
switch (Class) {
case 'w':
if (!SIZE_ONLY) {
if (PL_regflags & PMf_LOCALE)
*opnd |= ANYOF_ALNUML;
else {
for (Class = 0; Class < 256; Class++)
if (isALNUM(Class))
ANYOF_SET(opnd, Class);
}
}
lastclass = 1234;
continue;
case 'W':
if (!SIZE_ONLY) {
if (PL_regflags & PMf_LOCALE)
*opnd |= ANYOF_NALNUML;
else {
for (Class = 0; Class < 256; Class++)
if (!isALNUM(Class))
ANYOF_SET(opnd, Class);
}
}
lastclass = 1234;
continue;
case 's':
if (!SIZE_ONLY) {
if (PL_regflags & PMf_LOCALE)
*opnd |= ANYOF_SPACEL;
else {
for (Class = 0; Class < 256; Class++)
if (isSPACE(Class))
ANYOF_SET(opnd, Class);
}
}
lastclass = 1234;
continue;
case 'S':
if (!SIZE_ONLY) {
if (PL_regflags & PMf_LOCALE)
*opnd |= ANYOF_NSPACEL;
else {
for (Class = 0; Class < 256; Class++)
if (!isSPACE(Class))
ANYOF_SET(opnd, Class);
}
}
lastclass = 1234;
continue;
case 'd':
if (!SIZE_ONLY) {
for (Class = '0'; Class <= '9'; Class++)
ANYOF_SET(opnd, Class);
}
lastclass = 1234;
continue;
case 'D':
if (!SIZE_ONLY) {
for (Class = 0; Class < '0'; Class++)
ANYOF_SET(opnd, Class);
for (Class = '9' + 1; Class < 256; Class++)
ANYOF_SET(opnd, 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 'e':
Class = '\033';
break;
case 'a':
Class = '\007';
break;
case 'x':
Class = scan_hex(PL_regcomp_parse, 2, &numlen);
PL_regcomp_parse += numlen;
break;
case 'c':
Class = UCHARAT(PL_regcomp_parse++);
Class = toCTRL(Class);
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
Class = scan_oct(--PL_regcomp_parse, 3, &numlen);
PL_regcomp_parse += numlen;
break;
}
}
if (range) {
if (lastclass > Class)
FAIL("invalid [] range in regexp");
range = 0;
}
else {
lastclass = Class;
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) {
Maintenance releace 3 of perl5.005. Includes support for threads.
1999-05-02 14:33:17 +00:00
#ifndef ASCIIish
register I32 i;
if ((isLOWER(lastclass) && isLOWER(Class)) ||
(isUPPER(lastclass) && isUPPER(Class))) {
if (isLOWER(lastclass)) {
for (i = lastclass; i <= Class; i++)
if (isLOWER(i))
ANYOF_SET(opnd, i);
} else {
for (i = lastclass; i <= Class; i++)
if (isUPPER(i))
ANYOF_SET(opnd, i);
}
}
else
#endif
for ( ; lastclass <= Class; lastclass++)
ANYOF_SET(opnd, lastclass);
Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
}
lastclass = Class;
}
if (*PL_regcomp_parse != ']')
FAIL("unmatched [] in regexp");
nextchar();
/* optimize case-insensitive simple patterns (e.g. /[a-z]/i) */
if (!SIZE_ONLY && (*opnd & (0xFF ^ ANYOF_INVERT)) == ANYOF_FOLD) {
for (Class = 0; Class < 256; ++Class) {
if (ANYOF_TEST(opnd, Class)) {
I32 cf = fold[Class];
ANYOF_SET(opnd, cf);
}
}
*opnd &= ~ANYOF_FOLD;
}
/* optimize inverted simple patterns (e.g. [^a-z]) */
if (!SIZE_ONLY && (*opnd & 0xFF) == ANYOF_INVERT) {
for (Class = 0; Class < 32; ++Class)
opnd[1 + Class] ^= 0xFF;
*opnd = 0;
}
return ret;
}
STATIC char*
nextchar(void)
{
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. */
reg_node(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);
}
/*
- reganode - emit a node with an argument
*/
STATIC regnode * /* Location. */
reganode(U8 op, U32 arg)
{
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);
}
/*
- regc - emit (if appropriate) a byte of code
*/
STATIC void
regc(U8 b, char* s)
{
dTHR;
if (!SIZE_ONLY)
*s = b;
}
/*
- reginsert - insert an operator in front of already-emitted operand
*
* Means relocating the operand.
*/
STATIC void
reginsert(U8 op, regnode *opnd)
{
dTHR;
register regnode *src;
register regnode *dst;
register regnode *place;
register int offset = regarglen[(U8)op];
/* (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);
}
/*
- regtail - set the next-pointer at the end of a node chain of p to val.
*/
STATIC void
regtail(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(regnode *p, regnode *val)
{
dTHR;
/* "Operandless" and "op != BRANCH" are synonymous in practice. */
if (p == NULL || SIZE_ONLY)
return;
if (regkind[(U8)OP(p)] == BRANCH) {
regtail(NEXTOPER(p), val);
} else if ( regkind[(U8)OP(p)] == BRANCHJ) {
regtail(NEXTOPER(NEXTOPER(p)), val);
} else
return;
}
/*
- regcurly - a little FSA that accepts {\d+,?\d*}
*/
STATIC I32
regcurly(register char *s)
{
if (*s++ != '{')
return FALSE;
if (!isDIGIT(*s))
return FALSE;
while (isDIGIT(*s))
s++;
if (*s == ',')
s++;
while (isDIGIT(*s))
s++;
if (*s != '}')
return FALSE;
return TRUE;
}
STATIC regnode *
dumpuntil(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 (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 (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 (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 (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 Perl_debug_log in vaguely comprehensible form
*/
void
regdump(regexp *r)
{
#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
*/
void
regprop(SV *sv, regnode *o)
{
#ifdef DEBUGGING
dTHR;
register char *p = 0;
sv_setpvn(sv, "", 0);
switch (OP(o)) {
case BOL:
p = "BOL";
break;
case MBOL:
p = "MBOL";
break;
case SBOL:
p = "SBOL";
break;
case EOL:
p = "EOL";
break;
case EOS:
p = "EOS";
break;
case MEOL:
p = "MEOL";
break;
case SEOL:
p = "SEOL";
break;
case ANY:
p = "ANY";
break;
case SANY:
p = "SANY";
break;
case ANYOF:
p = "ANYOF";
break;
case BRANCH:
p = "BRANCH";
break;
case EXACT:
sv_catpvf(sv, "EXACT <%s%s%s>", PL_colors[0], OPERAND(o) + 1, PL_colors[1]);
break;
case EXACTF:
sv_catpvf(sv, "EXACTF <%s%s%s>", PL_colors[0], OPERAND(o) + 1, PL_colors[1]);
break;
case EXACTFL:
sv_catpvf(sv, "EXACTFL <%s%s%s>", PL_colors[0], OPERAND(o) + 1, PL_colors[1]);
break;
case NOTHING:
p = "NOTHING";
break;
case TAIL:
p = "TAIL";
break;
case BACK:
p = "BACK";
break;
case END:
p = "END";
break;
case BOUND:
p = "BOUND";
break;
case BOUNDL:
p = "BOUNDL";
break;
case NBOUND:
p = "NBOUND";
break;
case NBOUNDL:
p = "NBOUNDL";
break;
case CURLY:
sv_catpvf(sv, "CURLY {%d,%d}", ARG1(o), ARG2(o));
break;
case CURLYM:
sv_catpvf(sv, "CURLYM[%d] {%d,%d}", o->flags, ARG1(o), ARG2(o));
break;
case CURLYN:
sv_catpvf(sv, "CURLYN[%d] {%d,%d}", o->flags, ARG1(o), ARG2(o));
break;
case CURLYX:
sv_catpvf(sv, "CURLYX {%d,%d}", ARG1(o), ARG2(o));
break;
case REF:
sv_catpvf(sv, "REF%d", ARG(o));
break;
case REFF:
sv_catpvf(sv, "REFF%d", ARG(o));
break;
case REFFL:
sv_catpvf(sv, "REFFL%d", ARG(o));
break;
case OPEN:
sv_catpvf(sv, "OPEN%d", ARG(o));
break;
case CLOSE:
sv_catpvf(sv, "CLOSE%d", ARG(o));
p = NULL;
break;
case STAR:
p = "STAR";
break;
case PLUS:
p = "PLUS";
break;
case MINMOD:
p = "MINMOD";
break;
case GPOS:
p = "GPOS";
break;
case UNLESSM:
sv_catpvf(sv, "UNLESSM[-%d]", o->flags);
break;
case IFMATCH:
sv_catpvf(sv, "IFMATCH[-%d]", o->flags);
break;
case SUCCEED:
p = "SUCCEED";
break;
case WHILEM:
p = "WHILEM";
break;
case DIGIT:
p = "DIGIT";
break;
case NDIGIT:
p = "NDIGIT";
break;
case ALNUM:
p = "ALNUM";
break;
case NALNUM:
p = "NALNUM";
break;
case SPACE:
p = "SPACE";
break;
case NSPACE:
p = "NSPACE";
break;
case ALNUML:
p = "ALNUML";
break;
case NALNUML:
p = "NALNUML";
break;
case SPACEL:
p = "SPACEL";
break;
case NSPACEL:
p = "NSPACEL";
break;
case EVAL:
p = "EVAL";
break;
case LONGJMP:
p = "LONGJMP";
break;
case BRANCHJ:
p = "BRANCHJ";
break;
case IFTHEN:
p = "IFTHEN";
break;
case GROUPP:
sv_catpvf(sv, "GROUPP%d", ARG(o));
break;
case LOGICAL:
p = "LOGICAL";
break;
case SUSPEND:
p = "SUSPEND";
break;
case RENUM:
p = "RENUM";
break;
case OPTIMIZED:
p = "OPTIMIZED";
break;
default:
FAIL("corrupted regexp opcode");
}
if (p)
sv_catpv(sv, p);
#endif /* DEBUGGING */
}
void
pregfree(struct regexp *r)
{
dTHR;
if (!r || (--r->refcnt > 0))
return;
if (r->precomp)
Safefree(r->precomp);
if (r->subbase)
Safefree(r->subbase);
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;
while (--n >= 0) {
switch (r->data->what[n]) {
case 's':
SvREFCNT_dec((SV*)r->data->data[n]);
break;
case 'o':
op_free((OP_4tree*)r->data->data[n]);
break;
case 'n':
break;
default:
FAIL2("panic: regfree data code '%c'", r->data->what[n]);
}
}
Safefree(r->data->what);
Safefree(r->data);
}
Safefree(r->startp);
Safefree(r->endp);
Safefree(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 *
regnext(register regnode *p)
{
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
re_croak2(const char* pat1,const char* pat2,...)
{
va_list args;
STRLEN l1 = strlen(pat1);
STRLEN l2 = strlen(pat2);
char buf[512];
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';
va_start(args, pat2);
message = mess(buf, &args);
va_end(args);
l1 = strlen(message);
if (l1 > 512)
l1 = 512;
Copy(message, buf, l1 , char);
buf[l1] = '\0'; /* Overwrite \n */
croak("%s", buf);
}
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