#define SLAB_LAST(s) (&(s)->states[PERL_REGMATCH_SLAB_SLOTS-1])
static void S_setup_eval_state(pTHX_ regmatch_info *const reginfo);
-static void S_restore_eval_state(pTHX_ void *arg);
-static void S_clear_backtrack_stack(pTHX_ void *p);
+static void S_cleanup_regmatch_info_aux(pTHX_ void *arg);
+static regmatch_state * S_push_slab(pTHX);
#define REGCP_PAREN_ELEMS 3
#define REGCP_OTHER_ELEMS 3
* with giant delta may be not rechecked).
*/
-/* Assumptions: if ANCH_GPOS, then strpos is anchored. XXXX Check GPOS logic */
-
/* If SCREAM, then SvPVX_const(sv) should be compatible with strpos and strend.
Otherwise, only SvCUR(sv) is used to get strbeg. */
-/* XXXX We assume that strpos is strbeg unless sv. */
-
/* XXXX Some places assume that there is a fixed substring.
An update may be needed if optimizer marks as "INTUITable"
RExen without fixed substrings. Similarly, it is assumed that
PERL_UNUSED_ARG(flags);
PERL_UNUSED_ARG(data);
- reginfo->is_utf8_target = cBOOL(utf8_target);
-
/* CHR_DIST() would be more correct here but it makes things slow. */
if (prog->minlen > strend - strpos) {
DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
goto fail;
}
- reginfo->eval_state = NULL;
+ reginfo->is_utf8_target = cBOOL(utf8_target);
+ reginfo->info_aux = NULL;
reginfo->strbeg = strbeg;
reginfo->strend = strend;
reginfo->is_utf8_pat = cBOOL(RX_UTF8(rx));
}
check = prog->check_substr;
}
- if (prog->extflags & RXf_ANCH) { /* Match at beg-of-str or after \n */
- ml_anch = !( (prog->extflags & RXf_ANCH_SINGLE)
+ if ((prog->extflags & RXf_ANCH) /* Match at beg-of-str or after \n */
+ && !(prog->extflags & RXf_ANCH_GPOS)) /* \G isn't a BOS or \n */
+ {
+ ml_anch = !( (prog->extflags & RXf_ANCH_SINGLE)
|| ( (prog->extflags & RXf_ANCH_BOL)
&& !multiline ) ); /* Check after \n? */
if (!ml_anch) {
- if ( !(prog->extflags & RXf_ANCH_GPOS) /* Checked by the caller */
- && !(prog->intflags & PREGf_IMPLICIT) /* not a real BOL */
+ if ( !(prog->intflags & PREGf_IMPLICIT) /* not a real BOL */
&& (strpos != strbeg)) {
DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Not at start...\n"));
goto fail;
/* If regstclass takes bytelength more than 1: If charlength==1, OK.
This leaves EXACTF-ish only, which are dealt with in find_byclass(). */
const U8* const str = (U8*)STRING(progi->regstclass);
+ /* XXX this value could be pre-computed */
const int cl_l = (PL_regkind[OP(progi->regstclass)] == EXACT
- ? CHR_DIST(str+STR_LEN(progi->regstclass), str)
+ ? (reginfo->is_utf8_pat
+ ? utf8_distance(str + STR_LEN(progi->regstclass), str)
+ : STR_LEN(progi->regstclass))
: 1);
char * endpos;
if (prog->anchored_substr || prog->anchored_utf8 || ml_anch)
#define DUMP_EXEC_POS(li,s,doutf8) \
dump_exec_pos(li,s,(reginfo->strend),(reginfo->strbeg), \
- (PL_reg_starttry),doutf8)
+ startpos, doutf8)
#define UTF8_NOLOAD(TEST_NON_UTF8, IF_SUCCESS, IF_FAIL) \
return s;
}
+/* set RX_SAVED_COPY, RX_SUBBEG etc.
+ * flags have same meanings as with regexec_flags() */
+
+static void
+S_reg_set_capture_string(pTHX_ REGEXP * const rx,
+ char *strbeg,
+ char *strend,
+ SV *sv,
+ U32 flags,
+ bool utf8_target)
+{
+ struct regexp *const prog = ReANY(rx);
+
+ if (flags & REXEC_COPY_STR) {
+#ifdef PERL_ANY_COW
+ if (SvCANCOW(sv)) {
+ if (DEBUG_C_TEST) {
+ PerlIO_printf(Perl_debug_log,
+ "Copy on write: regexp capture, type %d\n",
+ (int) SvTYPE(sv));
+ }
+ /* Create a new COW SV to share the match string and store
+ * in saved_copy, unless the current COW SV in saved_copy
+ * is valid and suitable for our purpose */
+ if (( prog->saved_copy
+ && SvIsCOW(prog->saved_copy)
+ && SvPOKp(prog->saved_copy)
+ && SvIsCOW(sv)
+ && SvPOKp(sv)
+ && SvPVX(sv) == SvPVX(prog->saved_copy)))
+ {
+ /* just reuse saved_copy SV */
+ if (RXp_MATCH_COPIED(prog)) {
+ Safefree(prog->subbeg);
+ RXp_MATCH_COPIED_off(prog);
+ }
+ }
+ else {
+ /* create new COW SV to share string */
+ RX_MATCH_COPY_FREE(rx);
+ prog->saved_copy = sv_setsv_cow(prog->saved_copy, sv);
+ }
+ prog->subbeg = (char *)SvPVX_const(prog->saved_copy);
+ assert (SvPOKp(prog->saved_copy));
+ prog->sublen = strend - strbeg;
+ prog->suboffset = 0;
+ prog->subcoffset = 0;
+ } else
+#endif
+ {
+ I32 min = 0;
+ I32 max = strend - strbeg;
+ I32 sublen;
+
+ if ( (flags & REXEC_COPY_SKIP_POST)
+ && !(prog->extflags & RXf_PMf_KEEPCOPY) /* //p */
+ && !(PL_sawampersand & SAWAMPERSAND_RIGHT)
+ ) { /* don't copy $' part of string */
+ U32 n = 0;
+ max = -1;
+ /* calculate the right-most part of the string covered
+ * by a capture. Due to look-ahead, this may be to
+ * the right of $&, so we have to scan all captures */
+ while (n <= prog->lastparen) {
+ if (prog->offs[n].end > max)
+ max = prog->offs[n].end;
+ n++;
+ }
+ if (max == -1)
+ max = (PL_sawampersand & SAWAMPERSAND_LEFT)
+ ? prog->offs[0].start
+ : 0;
+ assert(max >= 0 && max <= strend - strbeg);
+ }
+
+ if ( (flags & REXEC_COPY_SKIP_PRE)
+ && !(prog->extflags & RXf_PMf_KEEPCOPY) /* //p */
+ && !(PL_sawampersand & SAWAMPERSAND_LEFT)
+ ) { /* don't copy $` part of string */
+ U32 n = 0;
+ min = max;
+ /* calculate the left-most part of the string covered
+ * by a capture. Due to look-behind, this may be to
+ * the left of $&, so we have to scan all captures */
+ while (min && n <= prog->lastparen) {
+ if ( prog->offs[n].start != -1
+ && prog->offs[n].start < min)
+ {
+ min = prog->offs[n].start;
+ }
+ n++;
+ }
+ if ((PL_sawampersand & SAWAMPERSAND_RIGHT)
+ && min > prog->offs[0].end
+ )
+ min = prog->offs[0].end;
+
+ }
+
+ assert(min >= 0 && min <= max && min <= strend - strbeg);
+ sublen = max - min;
+
+ if (RX_MATCH_COPIED(rx)) {
+ if (sublen > prog->sublen)
+ prog->subbeg =
+ (char*)saferealloc(prog->subbeg, sublen+1);
+ }
+ else
+ prog->subbeg = (char*)safemalloc(sublen+1);
+ Copy(strbeg + min, prog->subbeg, sublen, char);
+ prog->subbeg[sublen] = '\0';
+ prog->suboffset = min;
+ prog->sublen = sublen;
+ RX_MATCH_COPIED_on(rx);
+ }
+ prog->subcoffset = prog->suboffset;
+ if (prog->suboffset && utf8_target) {
+ /* Convert byte offset to chars.
+ * XXX ideally should only compute this if @-/@+
+ * has been seen, a la PL_sawampersand ??? */
+
+ /* If there's a direct correspondence between the
+ * string which we're matching and the original SV,
+ * then we can use the utf8 len cache associated with
+ * the SV. In particular, it means that under //g,
+ * sv_pos_b2u() will use the previously cached
+ * position to speed up working out the new length of
+ * subcoffset, rather than counting from the start of
+ * the string each time. This stops
+ * $x = "\x{100}" x 1E6; 1 while $x =~ /(.)/g;
+ * from going quadratic */
+ if (SvPOKp(sv) && SvPVX(sv) == strbeg)
+ sv_pos_b2u(sv, &(prog->subcoffset));
+ else
+ prog->subcoffset = utf8_length((U8*)strbeg,
+ (U8*)(strbeg+prog->suboffset));
+ }
+ }
+ else {
+ RX_MATCH_COPY_FREE(rx);
+ prog->subbeg = strbeg;
+ prog->suboffset = 0;
+ prog->subcoffset = 0;
+ prog->sublen = strend - strbeg;
+ }
+}
+
+
+
/*
- regexec_flags - match a regexp against a string
/* sv: SV being matched: only used for utf8 flag, pos() etc; string
* itself is accessed via the pointers above */
/* data: May be used for some additional optimizations.
- Currently its only used, with a U32 cast, for transmitting
- the ganch offset when doing a /g match. This will change */
-/* nosave: For optimizations. */
+ Currently unused. */
+/* flags: For optimizations. See REXEC_* in regexp.h */
{
dVAR;
struct regexp *const prog = ReANY(rx);
char *s;
regnode *c;
- char *startpos = stringarg;
+ char *startpos;
I32 minlen; /* must match at least this many chars */
I32 dontbother = 0; /* how many characters not to try at end */
I32 end_shift = 0; /* Same for the end. */ /* CC */
- I32 scream_pos = -1; /* Internal iterator of scream. */
- char *scream_olds = NULL;
const bool utf8_target = cBOOL(DO_UTF8(sv));
I32 multiline;
RXi_GET_DECL(prog,progi);
PERL_UNUSED_ARG(data);
/* Be paranoid... */
- if (prog == NULL || startpos == NULL) {
+ if (prog == NULL || stringarg == NULL) {
Perl_croak(aTHX_ "NULL regexp parameter");
return 0;
}
- multiline = prog->extflags & RXf_PMf_MULTILINE;
+ DEBUG_EXECUTE_r(
+ debug_start_match(rx, utf8_target, stringarg, strend,
+ "Matching");
+ );
- reginfo->eval_state = NULL;
- reginfo->prog = rx; /* Yes, sorry that this is confusing. */
- reginfo->intuit = 0;
- reginfo->is_utf8_target = cBOOL(utf8_target);
+ startpos = stringarg;
+
+ if (prog->extflags & RXf_GPOS_SEEN) {
+ MAGIC *mg;
+
+ /* set reginfo->ganch, the position where \G can match */
+
+ reginfo->ganch =
+ (flags & REXEC_IGNOREPOS)
+ ? stringarg /* use start pos rather than pos() */
+ : (sv && (mg = mg_find_mglob(sv)) && mg->mg_len >= 0)
+ ? strbeg + mg->mg_len /* Defined pos() */
+ : strbeg; /* pos() not defined; use start of string */
+
+ DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
+ "GPOS ganch set to strbeg[%"IVdf"]\n", reginfo->ganch - strbeg));
- /* on first ever match, allocate first slab */
- if (!PL_regmatch_slab) {
- Newx(PL_regmatch_slab, 1, regmatch_slab);
- PL_regmatch_slab->prev = NULL;
- PL_regmatch_slab->next = NULL;
- PL_regmatch_state = SLAB_FIRST(PL_regmatch_slab);
+ /* in the presence of \G, we may need to start looking earlier in
+ * the string than the suggested start point of stringarg:
+ * if gofs->prog is set, then that's a known, fixed minimum
+ * offset, such as
+ * /..\G/: gofs = 2
+ * /ab|c\G/: gofs = 1
+ * or if the minimum offset isn't known, then we have to go back
+ * to the start of the string, e.g. /w+\G/
+ */
+
+ if (prog->extflags & RXf_ANCH_GPOS) {
+ startpos = reginfo->ganch - prog->gofs;
+ if (startpos <
+ ((flags & REXEC_FAIL_ON_UNDERFLOW) ? stringarg : strbeg))
+ {
+ DEBUG_r(PerlIO_printf(Perl_debug_log,
+ "fail: ganch-gofs before earliest possible start\n"));
+ return 0;
+ }
+ }
+ else if (prog->gofs) {
+ if (startpos - prog->gofs < strbeg)
+ startpos = strbeg;
+ else
+ startpos -= prog->gofs;
+ }
+ else if (prog->extflags & RXf_GPOS_FLOAT)
+ startpos = strbeg;
}
- /* note current PL_regmatch_state position; at end of match we'll
- * pop back to there and free any higher slabs */
+ minlen = prog->minlen;
+ if ((startpos + minlen) > strend || startpos < strbeg) {
+ DEBUG_r(PerlIO_printf(Perl_debug_log,
+ "Regex match can't succeed, so not even tried\n"));
+ return 0;
+ }
+
+ /* at the end of this function, we'll do a LEAVE_SCOPE(oldsave),
+ * which will call destuctors to reset PL_regmatch_state, free higher
+ * PL_regmatch_slabs, and clean up regmatch_info_aux and
+ * regmatch_info_aux_eval */
+
oldsave = PL_savestack_ix;
- SAVEDESTRUCTOR_X(S_clear_backtrack_stack, NULL);
- SAVEVPTR(PL_regmatch_slab);
- SAVEVPTR(PL_regmatch_state);
+ s = startpos;
- DEBUG_EXECUTE_r(
- debug_start_match(rx, utf8_target, startpos, strend,
- "Matching");
- );
+ if ((prog->extflags & RXf_USE_INTUIT)
+ && !(flags & REXEC_CHECKED))
+ {
+ s = re_intuit_start(rx, sv, strbeg, startpos, strend,
+ flags, NULL);
+ if (!s)
+ return 0;
+
+ if (prog->extflags & RXf_CHECK_ALL) {
+ /* we can match based purely on the result of INTUIT.
+ * Set up captures etc just for $& and $-[0]
+ * (an intuit-only match wont have $1,$2,..) */
+ assert(!prog->nparens);
+
+ /* s/// doesn't like it if $& is earlier than where we asked it to
+ * start searching (which can happen on something like /.\G/) */
+ if ( (flags & REXEC_FAIL_ON_UNDERFLOW)
+ && (s < stringarg))
+ {
+ /* this should only be possible under \G */
+ assert(prog->extflags & RXf_GPOS_SEEN);
+ DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
+ "matched, but failing for REXEC_FAIL_ON_UNDERFLOW\n"));
+ goto phooey;
+ }
- minlen = prog->minlen;
+ /* match via INTUIT shouldn't have any captures.
+ * Let @-, @+, $^N know */
+ prog->lastparen = prog->lastcloseparen = 0;
+ RX_MATCH_UTF8_set(rx, utf8_target);
+ prog->offs[0].start = s - strbeg;
+ prog->offs[0].end = utf8_target
+ ? (char*)utf8_hop((U8*)s, prog->minlenret) - strbeg
+ : s - strbeg + prog->minlenret;
+ if ( !(flags & REXEC_NOT_FIRST) )
+ S_reg_set_capture_string(aTHX_ rx,
+ strbeg, strend,
+ sv, flags, utf8_target);
+
+ return 1;
+ }
+ }
+
+ multiline = prog->extflags & RXf_PMf_MULTILINE;
- if (strend - startpos < (minlen+(prog->check_offset_min<0?prog->check_offset_min:0))) {
+ if (strend - s < (minlen+(prog->check_offset_min<0?prog->check_offset_min:0))) {
DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
"String too short [regexec_flags]...\n"));
goto phooey;
}
-
/* Check validity of program. */
if (UCHARAT(progi->program) != REG_MAGIC) {
RX_MATCH_TAINTED_off(rx);
+ reginfo->prog = rx; /* Yes, sorry that this is confusing. */
+ reginfo->intuit = 0;
+ reginfo->is_utf8_target = cBOOL(utf8_target);
reginfo->is_utf8_pat = cBOOL(RX_UTF8(rx));
reginfo->warned = FALSE;
reginfo->strbeg = strbeg;
reginfo->sv = sv;
reginfo->poscache_maxiter = 0; /* not yet started a countdown */
-
- /* Mark end of string for $ (and such) */
reginfo->strend = strend;
-
/* see how far we have to get to not match where we matched before */
- reginfo->till = startpos+minend;
+ reginfo->till = stringarg + minend;
+
+ if (prog->extflags & RXf_EVAL_SEEN && SvPADTMP(sv) && !IS_PADGV(sv)) {
+ /* SAVEFREESV, not sv_mortalcopy, as this SV must last until after
+ S_cleanup_regmatch_info_aux has executed (registered by
+ SAVEDESTRUCTOR_X below). S_cleanup_regmatch_info_aux modifies
+ magic belonging to this SV.
+ Not newSVsv, either, as it does not COW.
+ */
+ reginfo->sv = newSV(0);
+ sv_setsv(reginfo->sv, sv);
+ SAVEFREESV(reginfo->sv);
+ }
- /* If there is a "must appear" string, look for it. */
- s = startpos;
+ /* reserve next 2 or 3 slots in PL_regmatch_state:
+ * slot N+0: may currently be in use: skip it
+ * slot N+1: use for regmatch_info_aux struct
+ * slot N+2: use for regmatch_info_aux_eval struct if we have (?{})'s
+ * slot N+3: ready for use by regmatch()
+ */
- if (prog->extflags & RXf_GPOS_SEEN) { /* Need to set reginfo->ganch */
- MAGIC *mg;
- if (flags & REXEC_IGNOREPOS){ /* Means: check only at start */
- reginfo->ganch = startpos + prog->gofs;
- DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
- "GPOS IGNOREPOS: reginfo->ganch = startpos + %"UVxf"\n",(UV)prog->gofs));
- } else if (sv && SvTYPE(sv) >= SVt_PVMG
- && SvMAGIC(sv)
- && (mg = mg_find(sv, PERL_MAGIC_regex_global))
- && mg->mg_len >= 0) {
- reginfo->ganch = strbeg + mg->mg_len; /* Defined pos() */
- DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
- "GPOS MAGIC: reginfo->ganch = strbeg + %"IVdf"\n",(IV)mg->mg_len));
-
- if (prog->extflags & RXf_ANCH_GPOS) {
- if (s > reginfo->ganch)
- goto phooey;
- s = reginfo->ganch - prog->gofs;
- DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
- "GPOS ANCH_GPOS: s = ganch - %"UVxf"\n",(UV)prog->gofs));
- if (s < strbeg)
- goto phooey;
- }
- }
- else if (data) {
- reginfo->ganch = strbeg + PTR2UV(data);
- DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
- "GPOS DATA: reginfo->ganch= strbeg + %"UVxf"\n",PTR2UV(data)));
-
- } else { /* pos() not defined */
- reginfo->ganch = strbeg;
- DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
- "GPOS: reginfo->ganch = strbeg\n"));
- }
+ {
+ regmatch_state *old_regmatch_state;
+ regmatch_slab *old_regmatch_slab;
+ int i, max = (prog->extflags & RXf_EVAL_SEEN) ? 2 : 1;
+
+ /* on first ever match, allocate first slab */
+ if (!PL_regmatch_slab) {
+ Newx(PL_regmatch_slab, 1, regmatch_slab);
+ PL_regmatch_slab->prev = NULL;
+ PL_regmatch_slab->next = NULL;
+ PL_regmatch_state = SLAB_FIRST(PL_regmatch_slab);
+ }
+
+ old_regmatch_state = PL_regmatch_state;
+ old_regmatch_slab = PL_regmatch_slab;
+
+ for (i=0; i <= max; i++) {
+ if (i == 1)
+ reginfo->info_aux = &(PL_regmatch_state->u.info_aux);
+ else if (i ==2)
+ reginfo->info_aux_eval =
+ reginfo->info_aux->info_aux_eval =
+ &(PL_regmatch_state->u.info_aux_eval);
+
+ if (++PL_regmatch_state > SLAB_LAST(PL_regmatch_slab))
+ PL_regmatch_state = S_push_slab(aTHX);
+ }
+
+ /* note initial PL_regmatch_state position; at end of match we'll
+ * pop back to there and free any higher slabs */
+
+ reginfo->info_aux->old_regmatch_state = old_regmatch_state;
+ reginfo->info_aux->old_regmatch_slab = old_regmatch_slab;
+ reginfo->info_aux->poscache = NULL;
+
+ SAVEDESTRUCTOR_X(S_cleanup_regmatch_info_aux, reginfo->info_aux);
+
+ if ((prog->extflags & RXf_EVAL_SEEN))
+ S_setup_eval_state(aTHX_ reginfo);
+ else
+ reginfo->info_aux_eval = reginfo->info_aux->info_aux_eval = NULL;
}
+
+ /* If there is a "must appear" string, look for it. */
+
if (PL_curpm && (PM_GETRE(PL_curpm) == rx)) {
/* We have to be careful. If the previous successful match
was from this regex we don't want a subsequent partially
PTR2UV(prog->offs)
));
}
- if (!(flags & REXEC_CHECKED) && (prog->check_substr != NULL || prog->check_utf8 != NULL)) {
- re_scream_pos_data d;
-
- d.scream_olds = &scream_olds;
- d.scream_pos = &scream_pos;
- s = re_intuit_start(rx, sv, strbeg, s, strend, flags, &d);
- if (!s) {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Not present...\n"));
- goto phooey; /* not present */
- }
- }
-
-
/* Simplest case: anchored match need be tried only once. */
/* [unless only anchor is BOL and multiline is set] */
if (prog->extflags & (RXf_ANCH & ~RXf_ANCH_GPOS)) {
- if (s == startpos && regtry(reginfo, &startpos))
+ if (s == startpos && regtry(reginfo, &s))
goto got_it;
else if (multiline || (prog->intflags & PREGf_IMPLICIT)
|| (prog->extflags & RXf_ANCH_MBOL)) /* XXXX SBOL? */
goto phooey;
} else if (RXf_GPOS_CHECK == (prog->extflags & RXf_GPOS_CHECK))
{
- /* the warning about reginfo->ganch being used without initialization
- is bogus -- we set it above, when prog->extflags & RXf_GPOS_SEEN
- and we only enter this block when the same bit is set. */
- char *tmp_s = reginfo->ganch - prog->gofs;
-
- if (tmp_s >= strbeg && regtry(reginfo, &tmp_s))
+ /* For anchored \G, the only position it can match from is
+ * (ganch-gofs); we already set startpos to this above; if intuit
+ * moved us on from there, we can't possibly succeed */
+ assert(startpos == reginfo->ganch - prog->gofs);
+ if (s == startpos && regtry(reginfo, &s))
goto got_it;
goto phooey;
}
/* XXXX check_substr already used to find "s", can optimize if
check_substr==must. */
- scream_pos = -1;
dontbother = end_shift;
strend = HOPc(strend, -dontbother);
while ( (s <= last) &&
goto phooey;
got_it:
+ /* s/// doesn't like it if $& is earlier than where we asked it to
+ * start searching (which can happen on something like /.\G/) */
+ if ( (flags & REXEC_FAIL_ON_UNDERFLOW)
+ && (prog->offs[0].start < stringarg - strbeg))
+ {
+ /* this should only be possible under \G */
+ assert(prog->extflags & RXf_GPOS_SEEN);
+ DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
+ "matched, but failing for REXEC_FAIL_ON_UNDERFLOW\n"));
+ goto phooey;
+ }
+
DEBUG_BUFFERS_r(
if (swap)
PerlIO_printf(Perl_debug_log,
);
Safefree(swap);
- if (reginfo->eval_state) {
- reginfo->eval_state->direct = TRUE;
- S_restore_eval_state(aTHX_ reginfo->eval_state);
- }
+ /* clean up; this will trigger destructors that will free all slabs
+ * above the current one, and cleanup the regmatch_info_aux
+ * and regmatch_info_aux_eval sructs */
- /* clean up; in particular, free all slabs above current one */
LEAVE_SCOPE(oldsave);
if (RXp_PAREN_NAMES(prog))
RX_MATCH_UTF8_set(rx, utf8_target);
/* make sure $`, $&, $', and $digit will work later */
- if ( !(flags & REXEC_NOT_FIRST) ) {
- if (flags & REXEC_COPY_STR) {
-#ifdef PERL_ANY_COW
- if (SvCANCOW(sv)) {
- if (DEBUG_C_TEST) {
- PerlIO_printf(Perl_debug_log,
- "Copy on write: regexp capture, type %d\n",
- (int) SvTYPE(sv));
- }
- RX_MATCH_COPY_FREE(rx);
- prog->saved_copy = sv_setsv_cow(prog->saved_copy, sv);
- prog->subbeg = (char *)SvPVX_const(prog->saved_copy);
- assert (SvPOKp(prog->saved_copy));
- prog->sublen = reginfo->strend - strbeg;
- prog->suboffset = 0;
- prog->subcoffset = 0;
- } else
-#endif
- {
- I32 min = 0;
- I32 max = reginfo->strend - strbeg;
- I32 sublen;
-
- if ( (flags & REXEC_COPY_SKIP_POST)
- && !(RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY) /* //p */
- && !(PL_sawampersand & SAWAMPERSAND_RIGHT)
- ) { /* don't copy $' part of string */
- U32 n = 0;
- max = -1;
- /* calculate the right-most part of the string covered
- * by a capture. Due to look-ahead, this may be to
- * the right of $&, so we have to scan all captures */
- while (n <= prog->lastparen) {
- if (prog->offs[n].end > max)
- max = prog->offs[n].end;
- n++;
- }
- if (max == -1)
- max = (PL_sawampersand & SAWAMPERSAND_LEFT)
- ? prog->offs[0].start
- : 0;
- assert(max >= 0 && max <= reginfo->strend - strbeg);
- }
-
- if ( (flags & REXEC_COPY_SKIP_PRE)
- && !(RX_EXTFLAGS(rx) & RXf_PMf_KEEPCOPY) /* //p */
- && !(PL_sawampersand & SAWAMPERSAND_LEFT)
- ) { /* don't copy $` part of string */
- U32 n = 0;
- min = max;
- /* calculate the left-most part of the string covered
- * by a capture. Due to look-behind, this may be to
- * the left of $&, so we have to scan all captures */
- while (min && n <= prog->lastparen) {
- if ( prog->offs[n].start != -1
- && prog->offs[n].start < min)
- {
- min = prog->offs[n].start;
- }
- n++;
- }
- if ((PL_sawampersand & SAWAMPERSAND_RIGHT)
- && min > prog->offs[0].end
- )
- min = prog->offs[0].end;
-
- }
-
- assert(min >= 0 && min <= max
- && min <= reginfo->strend - strbeg);
- sublen = max - min;
-
- if (RX_MATCH_COPIED(rx)) {
- if (sublen > prog->sublen)
- prog->subbeg =
- (char*)saferealloc(prog->subbeg, sublen+1);
- }
- else
- prog->subbeg = (char*)safemalloc(sublen+1);
- Copy(strbeg + min, prog->subbeg, sublen, char);
- prog->subbeg[sublen] = '\0';
- prog->suboffset = min;
- prog->sublen = sublen;
- RX_MATCH_COPIED_on(rx);
- }
- prog->subcoffset = prog->suboffset;
- if (prog->suboffset && utf8_target) {
- /* Convert byte offset to chars.
- * XXX ideally should only compute this if @-/@+
- * has been seen, a la PL_sawampersand ??? */
-
- /* If there's a direct correspondence between the
- * string which we're matching and the original SV,
- * then we can use the utf8 len cache associated with
- * the SV. In particular, it means that under //g,
- * sv_pos_b2u() will use the previously cached
- * position to speed up working out the new length of
- * subcoffset, rather than counting from the start of
- * the string each time. This stops
- * $x = "\x{100}" x 1E6; 1 while $x =~ /(.)/g;
- * from going quadratic */
- if (SvPOKp(sv) && SvPVX(sv) == strbeg)
- sv_pos_b2u(sv, &(prog->subcoffset));
- else
- prog->subcoffset = utf8_length((U8*)strbeg,
- (U8*)(strbeg+prog->suboffset));
- }
- }
- else {
- RX_MATCH_COPY_FREE(rx);
- prog->subbeg = strbeg;
- prog->suboffset = 0;
- prog->subcoffset = 0;
- /* use reginfo->strend, as strend may have been modified */
- prog->sublen = reginfo->strend - strbeg;
- }
- }
+ if ( !(flags & REXEC_NOT_FIRST) )
+ S_reg_set_capture_string(aTHX_ rx,
+ strbeg, reginfo->strend,
+ sv, flags, utf8_target);
return 1;
DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch failed%s\n",
PL_colors[4], PL_colors[5]));
- if (reginfo->eval_state) {
- reginfo->eval_state->direct = TRUE;
- S_restore_eval_state(aTHX_ reginfo->eval_state);
- }
+ /* clean up; this will trigger destructors that will free all slabs
+ * above the current one, and cleanup the regmatch_info_aux
+ * and regmatch_info_aux_eval sructs */
- /* clean up; in particular, free all slabs above current one */
LEAVE_SCOPE(oldsave);
if (swap) {
}
-/* Set which rex is pointed to by PL_reg_state, handling ref counting.
+/* Set which rex is pointed to by PL_reg_curpm, handling ref counting.
* Do inc before dec, in case old and new rex are the same */
#define SET_reg_curpm(Re2) \
- if (reginfo->eval_state) { \
+ if (reginfo->info_aux_eval) { \
(void)ReREFCNT_inc(Re2); \
ReREFCNT_dec(PM_GETRE(PL_reg_curpm)); \
PM_SETRE((PL_reg_curpm), (Re2)); \
reginfo->cutpoint=NULL;
- if ((prog->extflags & RXf_EVAL_SEEN) && !reginfo->eval_state)
- S_setup_eval_state(aTHX_ reginfo);
-
-#ifdef DEBUGGING
- PL_reg_starttry = *startposp;
-#endif
prog->offs[0].start = *startposp - reginfo->strbeg;
prog->lastparen = 0;
prog->lastcloseparen = 0;
"unreachable code" warnings, which are bogus, but distracting. */
#define CACHEsayNO \
if (ST.cache_mask) \
- PL_reg_poscache[ST.cache_offset] |= ST.cache_mask; \
+ reginfo->info_aux->poscache[ST.cache_offset] |= ST.cache_mask; \
sayNO
/* this is used to determine how far from the left messages like
}
-/* free all slabs above current one - called during LEAVE_SCOPE */
-
-STATIC void
-S_clear_backtrack_stack(pTHX_ void *p)
-{
- regmatch_slab *s = PL_regmatch_slab->next;
- PERL_UNUSED_ARG(p);
-
- if (!s)
- return;
- PL_regmatch_slab->next = NULL;
- while (s) {
- regmatch_slab * const osl = s;
- s = s->next;
- Safefree(osl);
- }
-}
-
-
static bool
S_setup_EXACTISH_ST_c1_c2(pTHX_ const regnode * const text_node, int *c1p,
U8* c1_utf8, int *c2p, U8* c2_utf8, regmatch_info *reginfo)
PerlIO_printf(Perl_debug_log,"regmatch start\n");
}));
- /* grab next free state slot */
- st = ++PL_regmatch_state;
- if (st > SLAB_LAST(PL_regmatch_slab))
- st = PL_regmatch_state = S_push_slab(aTHX);
+ st = PL_regmatch_state;
/* Note that nextchr is a byte even in UTF */
SET_nextchr;
OP * const oop = PL_op;
COP * const ocurcop = PL_curcop;
OP *nop;
- struct re_save_state saved_state;
CV *newcv;
/* save *all* paren positions */
regcppush(rex, 0, maxopenparen);
REGCP_SET(runops_cp);
- /* To not corrupt the existing regex state while executing the
- * eval we would normally put it on the save stack, like with
- * save_re_context. However, re-evals have a weird scoping so we
- * can't just add ENTER/LEAVE here. With that, things like
- *
- * (?{$a=2})(a(?{local$a=$a+1}))*aak*c(?{$b=$a})
- *
- * would break, as they expect the localisation to be unwound
- * only when the re-engine backtracks through the bit that
- * localised it.
- *
- * What we do instead is just saving the state in a local c
- * variable.
- */
- Copy(&PL_reg_state, &saved_state, 1, struct re_save_state);
-
if (!caller_cv)
caller_cv = find_runcv(NULL);
" re EVAL PL_op=0x%"UVxf"\n", PTR2UV(nop)) );
rex->offs[0].end = locinput - reginfo->strbeg;
- if (reginfo->eval_state->pos_magic)
- reginfo->eval_state->pos_magic->mg_len
+ if (reginfo->info_aux_eval->pos_magic)
+ reginfo->info_aux_eval->pos_magic->mg_len
= locinput - reginfo->strbeg;
if (sv_yes_mark) {
}
- Copy(&saved_state, &PL_reg_state, 1, struct re_save_state);
-
/* *** Note that at this point we don't restore
* PL_comppad, (or pop the CxSUB) on the assumption it may
* be used again soon. This is safe as long as nothing
PL_op = oop;
PL_curcop = ocurcop;
S_regcp_restore(aTHX_ rex, runops_cp, &maxopenparen);
+ PL_curpm = PL_reg_curpm;
if (logical != 2)
break;
maxopenparen = 0;
- /* XXXX This is too dramatic a measure... */
+ /* invalidate the S-L poscache. We're now executing a
+ * different set of WHILEM ops (and their associated
+ * indexes) against the same string, so the bits in the
+ * cache are meaningless. Setting maxiter to zero forces
+ * the cache to be invalidated and zeroed before reuse.
+ * XXX This is too dramatic a measure. Ideally we should
+ * save the old cache and restore when running the outer
+ * pattern again */
reginfo->poscache_maxiter = 0;
is_utf8_pat = reginfo->is_utf8_pat = cBOOL(RX_UTF8(re_sv));
cur_eval = ST.prev_eval;
cur_curlyx = ST.prev_curlyx;
- /* XXXX This is too dramatic a measure... */
+ /* Invalidate cache. See "invalidate" comment above. */
reginfo->poscache_maxiter = 0;
if ( nochange_depth )
nochange_depth--;
regcppop(rex, &maxopenparen);
cur_eval = ST.prev_eval;
cur_curlyx = ST.prev_curlyx;
- /* XXXX This is too dramatic a measure... */
+ /* Invalidate cache. See "invalidate" comment above. */
reginfo->poscache_maxiter = 0;
if ( nochange_depth )
nochange_depth--;
goto do_whilem_B_max;
}
- /* super-linear cache processing */
+ /* super-linear cache processing.
+ *
+ * The idea here is that for certain types of CURLYX/WHILEM -
+ * principally those whose upper bound is infinity (and
+ * excluding regexes that have things like \1 and other very
+ * non-regular expresssiony things), then if a pattern like
+ * /....A*.../ fails and we backtrack to the WHILEM, then we
+ * make a note that this particular WHILEM op was at string
+ * position 47 (say) when the rest of pattern failed. Then, if
+ * we ever find ourselves back at that WHILEM, and at string
+ * position 47 again, we can just fail immediately rather than
+ * running the rest of the pattern again.
+ *
+ * This is very handy when patterns start to go
+ * 'super-linear', like in (a+)*(a+)*(a+)*, where you end up
+ * with a combinatorial explosion of backtracking.
+ *
+ * The cache is implemented as a bit array, with one bit per
+ * string byte position per WHILEM op (up to 16) - so its
+ * between 0.25 and 2x the string size.
+ *
+ * To avoid allocating a poscache buffer every time, we do an
+ * initially countdown; only after we have executed a WHILEM
+ * op (string-length x #WHILEMs) times do we allocate the
+ * cache.
+ *
+ * The top 4 bits of scan->flags byte say how many different
+ * relevant CURLLYX/WHILEM op pairs there are, while the
+ * bottom 4-bits is the identifying index number of this
+ * WHILEM.
+ */
if (scan->flags) {
if (reginfo->poscache_iter-- == 0) {
/* initialise cache */
const I32 size = (reginfo->poscache_maxiter + 7)/8;
- if (PL_reg_poscache) {
- if ((I32)PL_reg_poscache_size < size) {
- Renew(PL_reg_poscache, size, char);
- PL_reg_poscache_size = size;
+ regmatch_info_aux *const aux = reginfo->info_aux;
+ if (aux->poscache) {
+ if ((I32)reginfo->poscache_size < size) {
+ Renew(aux->poscache, size, char);
+ reginfo->poscache_size = size;
}
- Zero(PL_reg_poscache, size, char);
+ Zero(aux->poscache, size, char);
}
else {
- PL_reg_poscache_size = size;
- Newxz(PL_reg_poscache, size, char);
+ reginfo->poscache_size = size;
+ Newxz(aux->poscache, size, char);
}
DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
"%swhilem: Detected a super-linear match, switching on caching%s...\n",
if (reginfo->poscache_iter < 0) {
/* have we already failed at this position? */
I32 offset, mask;
+
+ reginfo->poscache_iter = -1; /* stop eventual underflow */
offset = (scan->flags & 0xf) - 1
+ (locinput - reginfo->strbeg)
* (scan->flags>>4);
mask = 1 << (offset % 8);
offset /= 8;
- if (PL_reg_poscache[offset] & mask) {
+ if (reginfo->info_aux->poscache[offset] & mask) {
DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
"%*s whilem: (cache) already tried at this position...\n",
REPORT_CODE_OFF+depth*2, "")
DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
"%sMatch possible, but length=%ld is smaller than requested=%ld, failing!%s\n",
PL_colors[4],
- (long)(locinput - PL_reg_starttry),
- (long)(reginfo->till - PL_reg_starttry),
+ (long)(locinput - startpos),
+ (long)(reginfo->till - startpos),
PL_colors[5]));
sayNO_SILENT; /* Cannot match: too short. */
DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch successful!%s\n",
PL_colors[4], PL_colors[5]));
- if (reginfo->eval_state) {
+ if (reginfo->info_aux_eval) {
/* each successfully executed (?{...}) block does the equivalent of
* local $^R = do {...}
* When popping the save stack, all these locals would be undone;
scan = *startposp;
if (max == REG_INFTY)
max = I32_MAX;
- else if (! utf8_target && scan + max < loceol)
+ else if (! utf8_target && loceol - scan > max)
loceol = scan + max;
/* Here, for the case of a non-UTF-8 target we have adjusted <loceol> down
scan = loceol;
break;
case CANY: /* Move <scan> forward <max> bytes, unless goes off end */
- if (utf8_target && scan + max < loceol) {
+ if (utf8_target && loceol - scan > max) {
/* <loceol> hadn't been adjusted in the UTF-8 case */
scan += max;
* can use UTF8_IS_INVARIANT() even if the pattern isn't UTF-8, as it's
* true iff it doesn't matter if the argument is in UTF-8 or not */
if (UTF8_IS_INVARIANT(c) || (! utf8_target && ! reginfo->is_utf8_pat)) {
- if (utf8_target && scan + max < loceol) {
+ if (utf8_target && loceol - scan > max) {
/* We didn't adjust <loceol> because is UTF-8, but ok to do so,
* since here, to match at all, 1 char == 1 byte */
loceol = scan + max;
/* FALLTHROUGH */
case POSIXA:
- if (utf8_target && scan + max < loceol) {
+ if (utf8_target && loceol - scan > max) {
/* We didn't adjust <loceol> at the beginning of this routine
* because is UTF-8, but it is actually ok to do so, since here, to
S_core_regclass_swash(pTHX_ const regexp *prog, const regnode* node, bool doinit, SV** listsvp)
{
/* Returns the swash for the input 'node' in the regex 'prog'.
- * If <doinit> is true, will attempt to create the swash if not already
+ * If <doinit> is 'true', will attempt to create the swash if not already
* done.
- * If <listsvp> is non-null, will return the swash initialization string in
- * it.
+ * If <listsvp> is non-null, will return the printable contents of the
+ * swash. This can be used to get debugging information even before the
+ * swash exists, by calling this function with 'doinit' set to false, in
+ * which case the components that will be used to eventually create the
+ * swash are returned (in a printable form).
* Tied intimately to how regcomp.c sets up the data structure */
dVAR;
SV *sw = NULL;
- SV *si = NULL;
+ SV *si = NULL; /* Input swash initialization string */
SV* invlist = NULL;
RXi_GET_DECL(prog,progi);
}
}
+ /* If requested, return a printable version of what this swash matches */
if (listsvp) {
SV* matches_string = newSVpvn("", 0);
- /* Use the swash, if any, which has to have incorporated into it all
- * possibilities */
+ /* The swash should be used, if possible, to get the data, as it
+ * contains the resolved data. But this function can be called at
+ * compile-time, before everything gets resolved, in which case we
+ * return the currently best available information, which is the string
+ * that will eventually be used to do that resolving, 'si' */
if ((! sw || (invlist = _get_swash_invlist(sw)) == NULL)
&& (si && si != &PL_sv_undef))
{
-
- /* If no swash, use the input initialization string, if available */
sv_catsv(matches_string, si);
}
* save the old values of subbeg etc of the current regex, and set then
to the current string (again, this is normally only done at the end
of execution)
-
- It also sets up a destructor so that all this will be cleared up if
- we die.
*/
static void
{
MAGIC *mg;
regexp *const rex = ReANY(reginfo->prog);
- regmatch_eval_state *eval_state;
-
- Newx(eval_state, 1, regmatch_eval_state);
- assert(!reginfo->eval_state);
- reginfo->eval_state = eval_state;
+ regmatch_info_aux_eval *eval_state = reginfo->info_aux_eval;
- eval_state->restored = FALSE;
- eval_state->direct = FALSE;
eval_state->rex = rex;
if (reginfo->sv) {
DEFSV_set(reginfo->sv);
}
- if (!(SvTYPE(reginfo->sv) >= SVt_PVMG && SvMAGIC(reginfo->sv)
- && (mg = mg_find(reginfo->sv, PERL_MAGIC_regex_global)))) {
+ if (!(mg = mg_find_mglob(reginfo->sv))) {
/* prepare for quick setting of pos */
-#ifdef PERL_OLD_COPY_ON_WRITE
- if (SvIsCOW(reginfo->sv))
- sv_force_normal_flags(reginfo->sv, 0);
-#endif
- mg = sv_magicext(reginfo->sv, NULL, PERL_MAGIC_regex_global,
- &PL_vtbl_mglob, NULL, 0);
+ mg = sv_magicext_mglob(reginfo->sv);
mg->mg_len = -1;
}
eval_state->pos_magic = mg;
eval_state->pos_magic = NULL;
if (!PL_reg_curpm) {
+ /* PL_reg_curpm is a fake PMOP that we can attach the current
+ * regex to and point PL_curpm at, so that $1 et al are visible
+ * within a /(?{})/. It's just allocated once per interpreter the
+ * first time its needed */
Newxz(PL_reg_curpm, 1, PMOP);
#ifdef USE_ITHREADS
{
rex->suboffset = 0;
rex->subcoffset = 0;
rex->sublen = reginfo->strend - reginfo->strbeg;
- SAVEDESTRUCTOR_X(S_restore_eval_state, eval_state);
}
-/* undo the effects of S_setup_eval_state() - can either be called
- * directly, or via a destructor. If we get called directly, we'll still
- * get called again later from the destructor */
+
+/* destructor to clear up regmatch_info_aux and regmatch_info_aux_eval */
static void
-S_restore_eval_state(pTHX_ void *arg)
+S_cleanup_regmatch_info_aux(pTHX_ void *arg)
{
dVAR;
- regmatch_eval_state * const eval_state = (regmatch_eval_state *)arg;
- regexp * const rex = eval_state->rex;
-
- if (!eval_state->restored) {
- if (eval_state->subbeg) {
- rex->subbeg = eval_state->subbeg;
- rex->sublen = eval_state->sublen;
- rex->suboffset = eval_state->suboffset;
- rex->subcoffset = eval_state->subcoffset;
+ regmatch_info_aux *aux = (regmatch_info_aux *) arg;
+ regmatch_info_aux_eval *eval_state = aux->info_aux_eval;
+ regmatch_slab *s;
+
+ Safefree(aux->poscache);
+
+ if (eval_state) {
+
+ /* undo the effects of S_setup_eval_state() */
+
+ if (eval_state->subbeg) {
+ regexp * const rex = eval_state->rex;
+ rex->subbeg = eval_state->subbeg;
+ rex->sublen = eval_state->sublen;
+ rex->suboffset = eval_state->suboffset;
+ rex->subcoffset = eval_state->subcoffset;
#ifdef PERL_ANY_COW
- rex->saved_copy = eval_state->saved_copy;
+ rex->saved_copy = eval_state->saved_copy;
#endif
- RXp_MATCH_COPIED_on(rex);
- }
+ RXp_MATCH_COPIED_on(rex);
+ }
if (eval_state->pos_magic)
eval_state->pos_magic->mg_len = eval_state->pos;
- PL_curpm = eval_state->curpm;
- eval_state->restored = TRUE;
+
+ PL_curpm = eval_state->curpm;
+ }
+
+ PL_regmatch_state = aux->old_regmatch_state;
+ PL_regmatch_slab = aux->old_regmatch_slab;
+
+ /* free all slabs above current one - this must be the last action
+ * of this function, as aux and eval_state are allocated within
+ * slabs and may be freed here */
+
+ s = PL_regmatch_slab->next;
+ if (s) {
+ PL_regmatch_slab->next = NULL;
+ while (s) {
+ regmatch_slab * const osl = s;
+ s = s->next;
+ Safefree(osl);
+ }
}
- if (eval_state->direct)
- eval_state->direct = FALSE;
- else
- /* we're being called from a destructor rather than directly */
- Safefree(eval_state);
}
https://perl5.git.perl.org / perl5.git / blobdiff