/* sv.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- * 2000, 2001, 2002, 2003, 2004, 2005, by Larry Wall and others
+ * 2000, 2001, 2002, 2003, 2004, 2005, 2006, by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
called by visit() for each SV]):
sv_report_used() / do_report_used()
- dump all remaining SVs (debugging aid)
+ dump all remaining SVs (debugging aid)
sv_clean_objs() / do_clean_objs(),do_clean_named_objs()
Attempt to free all objects pointed to by RVs,
}
#ifndef NV_ZERO_IS_ALLBITS_ZERO
- /* If NV 0.0 is store as all bits 0 then Zero() already creates a correct
- 0.0 for us. */
+ /* If NV 0.0 is stores as all bits 0 then Zero() already creates a
+ * correct 0.0 for us. */
if (old_type_details->zero_nv)
SvNV_set(sv, 0);
#endif
if (new_type == SVt_PVIO)
- IoPAGE_LEN(sv) = 60;
+ IoPAGE_LEN(sv) = 60;
if (old_type < SVt_RV)
SvPV_set(sv, 0);
break;
} else if (SvTYPE(sv) < SVt_PVNV)
sv_upgrade(sv, SVt_PVNV);
- /* If NV preserves UV then we only use the UV value if we know that
+ /* If NVs preserve UVs then we only use the UV value if we know that
we aren't going to call atof() below. If NVs don't preserve UVs
then the value returned may have more precision than atof() will
return, even though value isn't perfectly accurate. */
if (!SvOK(sv))
return 0;
if (SvROK(sv)) {
- SV* tmpsv;
- if (SvAMAGIC(sv) && (tmpsv=AMG_CALLun(sv,bool_)) &&
- (!SvROK(tmpsv) || (SvRV(tmpsv) != SvRV(sv))))
- return (bool)SvTRUE(tmpsv);
- return SvRV(sv) != 0;
+ if (SvAMAGIC(sv)) {
+ SV * const tmpsv = AMG_CALLun(sv,bool_);
+ if (tmpsv && (!SvROK(tmpsv) || (SvRV(tmpsv) != SvRV(sv))))
+ return (bool)SvTRUE(tmpsv);
+ }
+ return SvRV(sv) != 0;
}
if (SvPOKp(sv)) {
register XPV* const Xpvtmp = (XPV*)SvANY(sv);
if (dtype >= SVt_PV) {
if (dtype == SVt_PVGV) {
SV * const sref = SvREFCNT_inc(SvRV(sstr));
- SV *dref = 0;
+ SV *dref = NULL;
const int intro = GvINTRO(dstr);
#ifdef GV_UNIQUE_CHECK
{
/* Redefining a sub - warning is mandatory if
it was a const and its value changed. */
- if (ckWARN(WARN_REDEFINE)
+ if (CvCONST(cv) && CvCONST((CV*)sref)
+ && cv_const_sv(cv)
+ == cv_const_sv((CV*)sref)) {
+ /* They are 2 constant subroutines
+ generated from the same constant.
+ This probably means that they are
+ really the "same" proxy subroutine
+ instantiated in 2 places. Most likely
+ this is when a constant is exported
+ twice. Don't warn. */
+ }
+ else if (ckWARN(WARN_REDEFINE)
|| (CvCONST(cv)
&& (!CvCONST((CV*)sref)
|| sv_cmp(cv_const_sv(cv),
Perl_sv_catpvn_flags(pTHX_ register SV *dsv, register const char *sstr, register STRLEN slen, I32 flags)
{
STRLEN dlen;
- const char *dstr = SvPV_force_flags(dsv, dlen, flags);
+ const char * const dstr = SvPV_force_flags(dsv, dlen, flags);
SvGROW(dsv, dlen + slen + 1);
if (sstr == dstr)
}
if (!SvMAGIC(sv)) {
SvMAGICAL_off(sv);
- SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_NOK|SVp_POK)) >> PRIVSHIFT;
+ SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_NOK|SVp_POK)) >> PRIVSHIFT;
+ SvMAGIC_set(sv, NULL);
}
return 0;
Perl_sv_add_backref(pTHX_ SV *tsv, SV *sv)
{
AV *av;
- MAGIC *mg;
- if (SvMAGICAL(tsv) && (mg = mg_find(tsv, PERL_MAGIC_backref)))
- av = (AV*)mg->mg_obj;
- else {
- av = newAV();
- sv_magic(tsv, (SV*)av, PERL_MAGIC_backref, NULL, 0);
- /* av now has a refcnt of 2, which avoids it getting freed
- * before us during global cleanup. The extra ref is removed
- * by magic_killbackrefs() when tsv is being freed */
+
+ if (SvTYPE(tsv) == SVt_PVHV) {
+ AV **const avp = Perl_hv_backreferences_p(aTHX_ (HV*)tsv);
+
+ av = *avp;
+ if (!av) {
+ /* There is no AV in the offical place - try a fixup. */
+ MAGIC *const mg = mg_find(tsv, PERL_MAGIC_backref);
+
+ if (mg) {
+ /* Aha. They've got it stowed in magic. Bring it back. */
+ av = (AV*)mg->mg_obj;
+ /* Stop mg_free decreasing the refernce count. */
+ mg->mg_obj = NULL;
+ /* Stop mg_free even calling the destructor, given that
+ there's no AV to free up. */
+ mg->mg_virtual = 0;
+ sv_unmagic(tsv, PERL_MAGIC_backref);
+ } else {
+ av = newAV();
+ AvREAL_off(av);
+ SvREFCNT_inc(av);
+ }
+ *avp = av;
+ }
+ } else {
+ const MAGIC *const mg
+ = SvMAGICAL(tsv) ? mg_find(tsv, PERL_MAGIC_backref) : NULL;
+ if (mg)
+ av = (AV*)mg->mg_obj;
+ else {
+ av = newAV();
+ AvREAL_off(av);
+ sv_magic(tsv, (SV*)av, PERL_MAGIC_backref, NULL, 0);
+ /* av now has a refcnt of 2, which avoids it getting freed
+ * before us during global cleanup. The extra ref is removed
+ * by magic_killbackrefs() when tsv is being freed */
+ }
}
if (AvFILLp(av) >= AvMAX(av)) {
av_extend(av, AvFILLp(av)+1);
STATIC void
S_sv_del_backref(pTHX_ SV *tsv, SV *sv)
{
- AV *av;
+ AV *av = NULL;
SV **svp;
I32 i;
- MAGIC *mg = NULL;
- if (!SvMAGICAL(tsv) || !(mg = mg_find(tsv, PERL_MAGIC_backref))) {
+
+ if (SvTYPE(tsv) == SVt_PVHV && SvOOK(tsv)) {
+ av = *Perl_hv_backreferences_p(aTHX_ (HV*)tsv);
+ /* We mustn't attempt to "fix up" the hash here by moving the
+ backreference array back to the hv_aux structure, as that is stored
+ in the main HvARRAY(), and hfreentries assumes that no-one
+ reallocates HvARRAY() while it is running. */
+ }
+ if (!av) {
+ const MAGIC *const mg
+ = SvMAGICAL(tsv) ? mg_find(tsv, PERL_MAGIC_backref) : NULL;
+ if (mg)
+ av = (AV *)mg->mg_obj;
+ }
+ if (!av) {
if (PL_in_clean_all)
return;
- }
- if (!SvMAGICAL(tsv) || !(mg = mg_find(tsv, PERL_MAGIC_backref)))
Perl_croak(aTHX_ "panic: del_backref");
- av = (AV *)mg->mg_obj;
+ }
+
+ if (SvIS_FREED(av))
+ return;
+
svp = AvARRAY(av);
/* We shouldn't be in here more than once, but for paranoia reasons lets
not assume this. */
}
}
+int
+Perl_sv_kill_backrefs(pTHX_ SV *sv, AV *av)
+{
+ SV **svp = AvARRAY(av);
+
+ PERL_UNUSED_ARG(sv);
+
+ /* Not sure why the av can get freed ahead of its sv, but somehow it does
+ in ext/B/t/bytecode.t test 15 (involving print <DATA>) */
+ if (svp && !SvIS_FREED(av)) {
+ SV *const *const last = svp + AvFILLp(av);
+
+ while (svp <= last) {
+ if (*svp) {
+ SV *const referrer = *svp;
+ if (SvWEAKREF(referrer)) {
+ /* XXX Should we check that it hasn't changed? */
+ SvRV_set(referrer, 0);
+ SvOK_off(referrer);
+ SvWEAKREF_off(referrer);
+ } else if (SvTYPE(referrer) == SVt_PVGV ||
+ SvTYPE(referrer) == SVt_PVLV) {
+ /* You lookin' at me? */
+ assert(GvSTASH(referrer));
+ assert(GvSTASH(referrer) == (HV*)sv);
+ GvSTASH(referrer) = 0;
+ } else {
+ Perl_croak(aTHX_
+ "panic: magic_killbackrefs (flags=%"UVxf")",
+ (UV)SvFLAGS(referrer));
+ }
+
+ *svp = Nullsv;
+ }
+ svp++;
+ }
+ }
+ SvREFCNT_dec(av); /* remove extra count added by sv_add_backref() */
+ return 0;
+}
+
/*
=for apidoc sv_insert
cv_undef((CV*)sv);
goto freescalar;
case SVt_PVHV:
+ Perl_hv_kill_backrefs(aTHX_ (HV*)sv);
hv_undef((HV*)sv);
break;
case SVt_PVAV:
start = (U8*)SvPV_const(sv, len);
if (len) {
STRLEN boffset = 0;
- STRLEN *cache = 0;
+ STRLEN *cache = NULL;
const U8 *s = start;
I32 uoffset = *offsetp;
const U8 * const send = s + len;
- MAGIC *mg = 0;
- bool found = FALSE;
+ MAGIC *mg = NULL;
+ bool found = utf8_mg_pos(sv, &mg, &cache, 0, offsetp, *offsetp, &s, start, send);
- if (utf8_mg_pos(sv, &mg, &cache, 0, offsetp, *offsetp, &s, start, send))
- found = TRUE;
if (!found && uoffset > 0) {
while (s < send && uoffset--)
s += UTF8SKIP(s);
{
/*The big, slow, and stupid way. */
#ifdef USE_HEAP_INSTEAD_OF_STACK /* Even slower way. */
- STDCHAR *buf = 0;
+ STDCHAR *buf = NULL;
Newx(buf, 8192, STDCHAR);
assert(buf);
#else
{
dVAR;
if (!sv)
- return sv;
+ return NULL;
if (SvREADONLY(sv) && SvIMMORTAL(sv))
return sv;
EXTEND_MORTAL(1);
register SV *sv;
if (!old)
- return Nullsv;
+ return NULL;
if (SvTYPE(old) == SVTYPEMASK) {
if (ckWARN_d(WARN_INTERNAL))
Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "semi-panic: attempt to dup freed string");
nmg->mg_obj = (SV*)re_dup((REGEXP*)mg->mg_obj, param);
}
else if(mg->mg_type == PERL_MAGIC_backref) {
- const AV * const av = (AV*) mg->mg_obj;
- SV **svp;
- I32 i;
- (void)SvREFCNT_inc(nmg->mg_obj = (SV*)newAV());
- svp = AvARRAY(av);
- for (i = AvFILLp(av); i >= 0; i--) {
- if (!svp[i]) continue;
- av_push((AV*)nmg->mg_obj,sv_dup(svp[i],param));
- }
+ /* The backref AV has its reference count deliberately bumped by
+ 1. */
+ nmg->mg_obj = SvREFCNT_inc(av_dup_inc((AV*) mg->mg_obj, param));
}
else if (mg->mg_type == PERL_MAGIC_symtab) {
nmg->mg_obj = mg->mg_obj;
void
-Perl_rvpv_dup(pTHX_ SV *dstr, SV *sstr, CLONE_PARAMS* param)
+Perl_rvpv_dup(pTHX_ SV *dstr, const SV *sstr, CLONE_PARAMS* param)
{
if (SvROK(sstr)) {
SvRV_set(dstr, SvWEAKREF(sstr)
/* duplicate an SV of any type (including AV, HV etc) */
SV *
-Perl_sv_dup(pTHX_ SV *sstr, CLONE_PARAMS* param)
+Perl_sv_dup(pTHX_ const SV *sstr, CLONE_PARAMS* param)
{
dVAR;
SV *dstr;
if(param->flags & CLONEf_JOIN_IN) {
/** We are joining here so we don't want do clone
something that is bad **/
- const char *hvname;
-
- if(SvTYPE(sstr) == SVt_PVHV &&
- (hvname = HvNAME_get(sstr))) {
- /** don't clone stashes if they already exist **/
- return (SV*)gv_stashpv(hvname,0);
+ if (SvTYPE(sstr) == SVt_PVHV) {
+ const char * const hvname = HvNAME_get(sstr);
+ if (hvname)
+ /** don't clone stashes if they already exist **/
+ return (SV*)gv_stashpv(hvname,0);
}
}
break;
case SVt_PVHV:
{
- HEK *hvname = 0;
+ HEK *hvname = NULL;
if (HvARRAY((HV*)sstr)) {
STRLEN i = 0;
daux->xhv_eiter = saux->xhv_eiter
? he_dup(saux->xhv_eiter,
(bool)!!HvSHAREKEYS(sstr), param) : 0;
+ daux->xhv_backreferences = saux->xhv_backreferences
+ ? (AV*) SvREFCNT_inc(
+ sv_dup((SV*)saux->
+ xhv_backreferences,
+ param))
+ : 0;
}
}
else {
PL_regex_padav = newAV();
{
const I32 len = av_len((AV*)proto_perl->Iregex_padav);
- SV** const regexen = AvARRAY((AV*)proto_perl->Iregex_padav);
+ SV* const * const regexen = AvARRAY((AV*)proto_perl->Iregex_padav);
IV i;
av_push(PL_regex_padav,
sv_dup_inc(regexen[0],param));
for(i = 1; i <= len; i++) {
- if(SvREPADTMP(regexen[i])) {
- av_push(PL_regex_padav, sv_dup_inc(regexen[i], param));
- } else {
- av_push(PL_regex_padav,
- SvREFCNT_inc(
- newSViv(PTR2IV(re_dup(INT2PTR(REGEXP *,
- SvIVX(regexen[i])), param)))
- ));
- }
+ const SV * const regex = regexen[i];
+ SV * const sv =
+ SvREPADTMP(regex)
+ ? sv_dup_inc(regex, param)
+ : SvREFCNT_inc(
+ newSViv(PTR2IV(re_dup(
+ INT2PTR(REGEXP *, SvIVX(regex)), param))))
+ ;
+ av_push(PL_regex_padav, sv);
}
}
PL_regex_pad = AvARRAY(PL_regex_padav);
}
else
PL_exitlist = (PerlExitListEntry*)NULL;
+
+ PL_my_cxt_size = proto_perl->Imy_cxt_size;
+ if (PL_my_cxt_size) {
+ Newx(PL_my_cxt_list, PL_my_cxt_size, void *);
+ Copy(proto_perl->Imy_cxt_list, PL_my_cxt_list, PL_my_cxt_size, void *);
+ }
+ else
+ PL_my_cxt_list = (void**)NULL;
PL_modglobal = hv_dup_inc(proto_perl->Imodglobal, param);
PL_custom_op_names = hv_dup_inc(proto_perl->Icustom_op_names,param);
PL_custom_op_descs = hv_dup_inc(proto_perl->Icustom_op_descs,param);