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scope.c
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scope.c
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/* scope.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
* 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* For the fashion of Minas Tirith was such that it was built on seven
* levels...
*
* [p.751 of _The Lord of the Rings_, V/i: "Minas Tirith"]
*/
/* This file contains functions to manipulate several of Perl's stacks;
* in particular it contains code to push various types of things onto
* the savestack, then to pop them off and perform the correct restorative
* action for each one. This corresponds to the cleanup Perl does at
* each scope exit.
*/
#include "EXTERN.h"
#define PERL_IN_SCOPE_C
#include "perl.h"
SV**
Perl_stack_grow(pTHX_ SV **sp, SV **p, int n)
{
dVAR;
PERL_ARGS_ASSERT_STACK_GROW;
PL_stack_sp = sp;
#ifndef STRESS_REALLOC
av_extend(PL_curstack, (p - PL_stack_base) + (n) + 128);
#else
av_extend(PL_curstack, (p - PL_stack_base) + (n) + 1);
#endif
return PL_stack_sp;
}
#ifndef STRESS_REALLOC
#define GROW(old) ((old) * 3 / 2)
#else
#define GROW(old) ((old) + 1)
#endif
PERL_SI *
Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems)
{
dVAR;
PERL_SI *si;
Newx(si, 1, PERL_SI);
si->si_stack = newAV();
AvREAL_off(si->si_stack);
av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0);
AvALLOC(si->si_stack)[0] = &PL_sv_undef;
AvFILLp(si->si_stack) = 0;
si->si_prev = 0;
si->si_next = 0;
si->si_cxmax = cxitems - 1;
si->si_cxix = -1;
si->si_type = PERLSI_UNDEF;
Newx(si->si_cxstack, cxitems, PERL_CONTEXT);
/* Without any kind of initialising PUSHSUBST()
* in pp_subst() will read uninitialised heap. */
PoisonNew(si->si_cxstack, cxitems, PERL_CONTEXT);
return si;
}
I32
Perl_cxinc(pTHX)
{
dVAR;
const IV old_max = cxstack_max;
cxstack_max = GROW(cxstack_max);
Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */
/* Without any kind of initialising deep enough recursion
* will end up reading uninitialised PERL_CONTEXTs. */
PoisonNew(cxstack + old_max + 1, cxstack_max - old_max, PERL_CONTEXT);
return cxstack_ix + 1;
}
void
Perl_push_scope(pTHX)
{
dVAR;
if (PL_scopestack_ix == PL_scopestack_max) {
PL_scopestack_max = GROW(PL_scopestack_max);
Renew(PL_scopestack, PL_scopestack_max, I32);
#ifdef DEBUGGING
Renew(PL_scopestack_name, PL_scopestack_max, const char*);
#endif
}
#ifdef DEBUGGING
PL_scopestack_name[PL_scopestack_ix] = "unknown";
#endif
PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix;
}
void
Perl_pop_scope(pTHX)
{
dVAR;
const I32 oldsave = PL_scopestack[--PL_scopestack_ix];
LEAVE_SCOPE(oldsave);
}
void
Perl_markstack_grow(pTHX)
{
dVAR;
const I32 oldmax = PL_markstack_max - PL_markstack;
const I32 newmax = GROW(oldmax);
Renew(PL_markstack, newmax, I32);
PL_markstack_ptr = PL_markstack + oldmax;
PL_markstack_max = PL_markstack + newmax;
}
void
Perl_savestack_grow(pTHX)
{
dVAR;
PL_savestack_max = GROW(PL_savestack_max) + 4;
Renew(PL_savestack, PL_savestack_max, ANY);
}
void
Perl_savestack_grow_cnt(pTHX_ I32 need)
{
dVAR;
PL_savestack_max = PL_savestack_ix + need;
Renew(PL_savestack, PL_savestack_max, ANY);
}
#undef GROW
void
Perl_tmps_grow(pTHX_ I32 n)
{
dVAR;
#ifndef STRESS_REALLOC
if (n < 128)
n = (PL_tmps_max < 512) ? 128 : 512;
#endif
PL_tmps_max = PL_tmps_ix + n + 1;
Renew(PL_tmps_stack, PL_tmps_max, SV*);
}
void
Perl_free_tmps(pTHX)
{
dVAR;
/* XXX should tmps_floor live in cxstack? */
const I32 myfloor = PL_tmps_floor;
while (PL_tmps_ix > myfloor) { /* clean up after last statement */
SV* const sv = PL_tmps_stack[PL_tmps_ix];
PL_tmps_stack[PL_tmps_ix--] = NULL;
if (sv && sv != &PL_sv_undef) {
SvTEMP_off(sv);
SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */
}
}
}
STATIC SV *
S_save_scalar_at(pTHX_ SV **sptr, const U32 flags)
{
dVAR;
SV * osv;
register SV *sv;
PERL_ARGS_ASSERT_SAVE_SCALAR_AT;
osv = *sptr;
sv = (flags & SAVEf_KEEPOLDELEM) ? osv : (*sptr = newSV(0));
if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) {
if (SvGMAGICAL(osv)) {
const bool oldtainted = PL_tainted;
SvFLAGS(osv) |= (SvFLAGS(osv) &
(SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
PL_tainted = oldtainted;
}
if (!(flags & SAVEf_KEEPOLDELEM))
mg_localize(osv, sv, (flags & SAVEf_SETMAGIC) != 0);
}
return sv;
}
void
Perl_save_pushptrptr(pTHX_ void *const ptr1, void *const ptr2, const int type)
{
dVAR;
SSCHECK(3);
SSPUSHPTR(ptr1);
SSPUSHPTR(ptr2);
SSPUSHUV(type);
}
SV *
Perl_save_scalar(pTHX_ GV *gv)
{
dVAR;
SV ** const sptr = &GvSVn(gv);
PERL_ARGS_ASSERT_SAVE_SCALAR;
PL_localizing = 1;
SvGETMAGIC(*sptr);
PL_localizing = 0;
save_pushptrptr(SvREFCNT_inc_simple(gv), SvREFCNT_inc(*sptr), SAVEt_SV);
return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
}
/* Like save_sptr(), but also SvREFCNT_dec()s the new value. Can be used to
* restore a global SV to its prior contents, freeing new value. */
void
Perl_save_generic_svref(pTHX_ SV **sptr)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_GENERIC_SVREF;
save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_GENERIC_SVREF);
}
/* Like save_pptr(), but also Safefree()s the new value if it is different
* from the old one. Can be used to restore a global char* to its prior
* contents, freeing new value. */
void
Perl_save_generic_pvref(pTHX_ char **str)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_GENERIC_PVREF;
save_pushptrptr(*str, str, SAVEt_GENERIC_PVREF);
}
/* Like save_generic_pvref(), but uses PerlMemShared_free() rather than Safefree().
* Can be used to restore a shared global char* to its prior
* contents, freeing new value. */
void
Perl_save_shared_pvref(pTHX_ char **str)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_SHARED_PVREF;
save_pushptrptr(str, *str, SAVEt_SHARED_PVREF);
}
/* set the SvFLAGS specified by mask to the values in val */
void
Perl_save_set_svflags(pTHX_ SV* sv, U32 mask, U32 val)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_SET_SVFLAGS;
SSCHECK(4);
SSPUSHPTR(sv);
SSPUSHINT(mask);
SSPUSHINT(val);
SSPUSHUV(SAVEt_SET_SVFLAGS);
}
void
Perl_save_gp(pTHX_ GV *gv, I32 empty)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_GP;
SSCHECK(4);
SSPUSHINT(SvFAKE(gv));
SSPUSHPTR(GvGP(gv));
SSPUSHPTR(SvREFCNT_inc(gv));
SSPUSHUV(SAVEt_GP);
/* Don't let the localized GV coerce into non-glob, otherwise we would
* not be able to restore GP upon leave from context if that happened */
SvFAKE_off(gv);
if (empty) {
GP *gp = Perl_newGP(aTHX_ gv);
if (GvCVu(gv))
mro_method_changed_in(GvSTASH(gv)); /* taking a method out of circulation ("local")*/
if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
gp->gp_io = newIO();
IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
}
#ifdef PERL_DONT_CREATE_GVSV
if (gv == PL_errgv) {
/* We could scatter this logic everywhere by changing the
definition of ERRSV from GvSV() to GvSVn(), but it seems more
efficient to do this check once here. */
gp->gp_sv = newSV(0);
}
#endif
GvGP(gv) = gp;
}
else {
gp_ref(GvGP(gv));
GvINTRO_on(gv);
}
}
AV *
Perl_save_ary(pTHX_ GV *gv)
{
dVAR;
AV * const oav = GvAVn(gv);
AV *av;
PERL_ARGS_ASSERT_SAVE_ARY;
if (!AvREAL(oav) && AvREIFY(oav))
av_reify(oav);
save_pushptrptr(gv, oav, SAVEt_AV);
GvAV(gv) = NULL;
av = GvAVn(gv);
if (SvMAGIC(oav))
mg_localize(MUTABLE_SV(oav), MUTABLE_SV(av), TRUE);
return av;
}
HV *
Perl_save_hash(pTHX_ GV *gv)
{
dVAR;
HV *ohv, *hv;
PERL_ARGS_ASSERT_SAVE_HASH;
save_pushptrptr(gv, (ohv = GvHVn(gv)), SAVEt_HV);
GvHV(gv) = NULL;
hv = GvHVn(gv);
if (SvMAGIC(ohv))
mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
return hv;
}
void
Perl_save_item(pTHX_ register SV *item)
{
dVAR;
register SV * const sv = newSVsv(item);
PERL_ARGS_ASSERT_SAVE_ITEM;
save_pushptrptr(item, /* remember the pointer */
sv, /* remember the value */
SAVEt_ITEM);
}
void
Perl_save_bool(pTHX_ bool *boolp)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_BOOL;
SSCHECK(2);
SSPUSHPTR(boolp);
SSPUSHUV(SAVEt_BOOL | (*boolp << 8));
}
void
Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
{
dVAR;
SSCHECK(3);
SSPUSHINT(i);
SSPUSHPTR(ptr);
SSPUSHUV(type);
}
void
Perl_save_int(pTHX_ int *intp)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_INT;
save_pushi32ptr(*intp, intp, SAVEt_INT);
}
void
Perl_save_I8(pTHX_ I8 *bytep)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_I8;
SSCHECK(2);
SSPUSHPTR(bytep);
SSPUSHUV(SAVEt_I8 | ((UV)*bytep << 8));
}
void
Perl_save_I16(pTHX_ I16 *intp)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_I16;
SSCHECK(2);
SSPUSHPTR(intp);
SSPUSHUV(SAVEt_I16 | ((UV)*intp << 8));
}
void
Perl_save_I32(pTHX_ I32 *intp)
{
dVAR;
const UV shifted = (UV)*intp << SAVE_TIGHT_SHIFT;
PERL_ARGS_ASSERT_SAVE_I32;
if ((I32)(shifted >> SAVE_TIGHT_SHIFT) == *intp) {
SSCHECK(2);
SSPUSHPTR(intp);
SSPUSHUV(SAVEt_I32_SMALL | shifted);
} else
save_pushi32ptr(*intp, intp, SAVEt_I32);
}
/* Cannot use save_sptr() to store a char* since the SV** cast will
* force word-alignment and we'll miss the pointer.
*/
void
Perl_save_pptr(pTHX_ char **pptr)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_PPTR;
save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
}
void
Perl_save_vptr(pTHX_ void *ptr)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_VPTR;
save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
}
void
Perl_save_sptr(pTHX_ SV **sptr)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_SPTR;
save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
}
void
Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
{
dVAR;
SSCHECK(4);
ASSERT_CURPAD_ACTIVE("save_padsv");
SSPUSHPTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
SSPUSHPTR(PL_comppad);
SSPUSHLONG((long)off);
SSPUSHUV(SAVEt_PADSV_AND_MORTALIZE);
}
void
Perl_save_hptr(pTHX_ HV **hptr)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_HPTR;
save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
}
void
Perl_save_aptr(pTHX_ AV **aptr)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_APTR;
save_pushptrptr(*aptr, aptr, SAVEt_APTR);
}
void
Perl_save_pushptr(pTHX_ void *const ptr, const int type)
{
dVAR;
SSCHECK(2);
SSPUSHPTR(ptr);
SSPUSHUV(type);
}
void
Perl_save_clearsv(pTHX_ SV **svp)
{
dVAR;
const UV offset = svp - PL_curpad;
const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
PERL_ARGS_ASSERT_SAVE_CLEARSV;
ASSERT_CURPAD_ACTIVE("save_clearsv");
if ((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)
Perl_croak(aTHX_ "panic: pad offset %"UVuf" out of range (%p-%p)",
offset, svp, PL_curpad);
SSCHECK(1);
SSPUSHUV(offset_shifted | SAVEt_CLEARSV);
SvPADSTALE_off(*svp); /* mark lexical as active */
}
void
Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_DELETE;
save_pushptri32ptr(key, klen, SvREFCNT_inc_simple(hv), SAVEt_DELETE);
}
void
Perl_save_hdelete(pTHX_ HV *hv, SV *keysv)
{
STRLEN len;
I32 klen;
const char *key;
PERL_ARGS_ASSERT_SAVE_HDELETE;
key = SvPV_const(keysv, len);
klen = SvUTF8(keysv) ? -(I32)len : (I32)len;
SvREFCNT_inc_simple_void_NN(hv);
save_pushptri32ptr(savepvn(key, len), klen, hv, SAVEt_DELETE);
}
void
Perl_save_adelete(pTHX_ AV *av, I32 key)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_ADELETE;
SvREFCNT_inc_void(av);
save_pushi32ptr(key, av, SAVEt_ADELETE);
}
void
Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
SSCHECK(3);
SSPUSHDPTR(f);
SSPUSHPTR(p);
SSPUSHUV(SAVEt_DESTRUCTOR);
}
void
Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
{
dVAR;
SSCHECK(3);
SSPUSHDXPTR(f);
SSPUSHPTR(p);
SSPUSHUV(SAVEt_DESTRUCTOR_X);
}
void
Perl_save_hints(pTHX)
{
dVAR;
if (PL_compiling.cop_hints_hash) {
HINTS_REFCNT_LOCK;
PL_compiling.cop_hints_hash->refcounted_he_refcnt++;
HINTS_REFCNT_UNLOCK;
}
if (PL_hints & HINT_LOCALIZE_HH) {
save_pushptri32ptr(GvHV(PL_hintgv), PL_hints,
PL_compiling.cop_hints_hash, SAVEt_HINTS);
GvHV(PL_hintgv) = Perl_hv_copy_hints_hv(aTHX_ GvHV(PL_hintgv));
} else {
save_pushi32ptr(PL_hints, PL_compiling.cop_hints_hash, SAVEt_HINTS);
}
}
static void
S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
const int type)
{
SSCHECK(4);
SSPUSHPTR(ptr1);
SSPUSHINT(i);
SSPUSHPTR(ptr2);
SSPUSHUV(type);
}
void
Perl_save_aelem_flags(pTHX_ AV *av, I32 idx, SV **sptr, const U32 flags)
{
dVAR;
SV *sv;
PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
SvGETMAGIC(*sptr);
save_pushptri32ptr(SvREFCNT_inc_simple(av), idx, SvREFCNT_inc(*sptr),
SAVEt_AELEM);
/* if it gets reified later, the restore will have the wrong refcnt */
if (!AvREAL(av) && AvREIFY(av))
SvREFCNT_inc_void(*sptr);
save_scalar_at(sptr, flags); /* XXX - FIXME - see #60360 */
if (flags & SAVEf_KEEPOLDELEM)
return;
sv = *sptr;
/* If we're localizing a tied array element, this new sv
* won't actually be stored in the array - so it won't get
* reaped when the localize ends. Ensure it gets reaped by
* mortifying it instead. DAPM */
if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
sv_2mortal(sv);
}
void
Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
{
dVAR;
SV *sv;
PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
SvGETMAGIC(*sptr);
SSCHECK(4);
SSPUSHPTR(SvREFCNT_inc_simple(hv));
SSPUSHPTR(newSVsv(key));
SSPUSHPTR(SvREFCNT_inc(*sptr));
SSPUSHUV(SAVEt_HELEM);
save_scalar_at(sptr, flags);
if (flags & SAVEf_KEEPOLDELEM)
return;
sv = *sptr;
/* If we're localizing a tied hash element, this new sv
* won't actually be stored in the hash - so it won't get
* reaped when the localize ends. Ensure it gets reaped by
* mortifying it instead. DAPM */
if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
sv_2mortal(sv);
}
SV*
Perl_save_svref(pTHX_ SV **sptr)
{
dVAR;
PERL_ARGS_ASSERT_SAVE_SVREF;
SvGETMAGIC(*sptr);
save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_SVREF);
return save_scalar_at(sptr, SAVEf_SETMAGIC); /* XXX - FIXME - see #60360 */
}
I32
Perl_save_alloc(pTHX_ I32 size, I32 pad)
{
dVAR;
register const I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix]
- (char*)PL_savestack);
const UV elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack));
const UV elems_shifted = elems << SAVE_TIGHT_SHIFT;
if ((elems_shifted >> SAVE_TIGHT_SHIFT) != elems)
Perl_croak(aTHX_ "panic: save_alloc elems %"UVuf" out of range (%ld-%ld)",
elems, size, pad);
SSGROW(elems + 1);
PL_savestack_ix += elems;
SSPUSHUV(SAVEt_ALLOC | elems_shifted);
return start;
}
void
Perl_leave_scope(pTHX_ I32 base)
{
dVAR;
register SV *sv;
register SV *value;
register GV *gv;
register AV *av;
register HV *hv;
void* ptr;
register char* str;
I32 i;
/* Localise the effects of the TAINT_NOT inside the loop. */
const bool was = PL_tainted;
if (base < -1)
Perl_croak(aTHX_ "panic: corrupt saved stack index");
DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
(long)PL_savestack_ix, (long)base));
while (PL_savestack_ix > base) {
UV uv = SSPOPUV;
const U8 type = (U8)uv & SAVE_MASK;
TAINT_NOT;
switch (type) {
case SAVEt_ITEM: /* normal string */
value = MUTABLE_SV(SSPOPPTR);
sv = MUTABLE_SV(SSPOPPTR);
sv_replace(sv,value);
PL_localizing = 2;
SvSETMAGIC(sv);
PL_localizing = 0;
break;
case SAVEt_SV: /* scalar reference */
value = MUTABLE_SV(SSPOPPTR);
gv = MUTABLE_GV(SSPOPPTR);
ptr = &GvSV(gv);
av = MUTABLE_AV(gv); /* what to refcnt_dec */
restore_sv:
sv = *(SV**)ptr;
*(SV**)ptr = value;
SvREFCNT_dec(sv);
PL_localizing = 2;
SvSETMAGIC(value);
PL_localizing = 0;
SvREFCNT_dec(value);
if (av) /* actually an av, hv or gv */
SvREFCNT_dec(av);
break;
case SAVEt_GENERIC_PVREF: /* generic pv */
ptr = SSPOPPTR;
str = (char*)SSPOPPTR;
if (*(char**)ptr != str) {
Safefree(*(char**)ptr);
*(char**)ptr = str;
}
break;
case SAVEt_SHARED_PVREF: /* shared pv */
str = (char*)SSPOPPTR;
ptr = SSPOPPTR;
if (*(char**)ptr != str) {
#ifdef NETWARE
PerlMem_free(*(char**)ptr);
#else
PerlMemShared_free(*(char**)ptr);
#endif
*(char**)ptr = str;
}
break;
case SAVEt_GENERIC_SVREF: /* generic sv */
value = MUTABLE_SV(SSPOPPTR);
ptr = SSPOPPTR;
sv = *(SV**)ptr;
*(SV**)ptr = value;
SvREFCNT_dec(sv);
SvREFCNT_dec(value);
break;
case SAVEt_AV: /* array reference */
av = MUTABLE_AV(SSPOPPTR);
gv = MUTABLE_GV(SSPOPPTR);
SvREFCNT_dec(GvAV(gv));
GvAV(gv) = av;
if (SvMAGICAL(av)) {
PL_localizing = 2;
SvSETMAGIC(MUTABLE_SV(av));
PL_localizing = 0;
}
break;
case SAVEt_HV: /* hash reference */
hv = MUTABLE_HV(SSPOPPTR);
gv = MUTABLE_GV(SSPOPPTR);
SvREFCNT_dec(GvHV(gv));
GvHV(gv) = hv;
if (SvMAGICAL(hv)) {
PL_localizing = 2;
SvSETMAGIC(MUTABLE_SV(hv));
PL_localizing = 0;
}
break;
case SAVEt_INT: /* int reference */
ptr = SSPOPPTR;
*(int*)ptr = (int)SSPOPINT;
break;
case SAVEt_BOOL: /* bool reference */
ptr = SSPOPPTR;
*(bool*)ptr = cBOOL(uv >> 8);
break;
case SAVEt_I32_SMALL:
ptr = SSPOPPTR;
*(I32*)ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
break;
case SAVEt_I32: /* I32 reference */
ptr = SSPOPPTR;
#ifdef PERL_DEBUG_READONLY_OPS
{
const I32 val = SSPOPINT;
if (*(I32*)ptr != val)
*(I32*)ptr = val;
}
#else
*(I32*)ptr = (I32)SSPOPINT;
#endif
break;
case SAVEt_SPTR: /* SV* reference */
ptr = SSPOPPTR;
*(SV**)ptr = MUTABLE_SV(SSPOPPTR);
break;
case SAVEt_VPTR: /* random* reference */
case SAVEt_PPTR: /* char* reference */
ptr = SSPOPPTR;
*(char**)ptr = (char*)SSPOPPTR;
break;
case SAVEt_HPTR: /* HV* reference */
ptr = SSPOPPTR;
*(HV**)ptr = MUTABLE_HV(SSPOPPTR);
break;
case SAVEt_APTR: /* AV* reference */
ptr = SSPOPPTR;
*(AV**)ptr = MUTABLE_AV(SSPOPPTR);
break;
case SAVEt_GP: /* scalar reference */
gv = MUTABLE_GV(SSPOPPTR);
gp_free(gv);
GvGP(gv) = (GP*)SSPOPPTR;
if (SSPOPINT)
SvFAKE_on(gv);
/* putting a method back into circulation ("local")*/
if (GvCVu(gv) && (hv=GvSTASH(gv)) && HvNAME_get(hv))
mro_method_changed_in(hv);
SvREFCNT_dec(gv);
break;
case SAVEt_FREESV:
ptr = SSPOPPTR;
SvREFCNT_dec(MUTABLE_SV(ptr));
break;
case SAVEt_MORTALIZESV:
ptr = SSPOPPTR;
sv_2mortal(MUTABLE_SV(ptr));
break;
case SAVEt_FREEOP:
ptr = SSPOPPTR;
ASSERT_CURPAD_LEGAL("SAVEt_FREEOP"); /* XXX DAPM tmp */
op_free((OP*)ptr);
break;
case SAVEt_FREEPV:
ptr = SSPOPPTR;
Safefree(ptr);
break;
case SAVEt_CLEARSV:
ptr = (void*)&PL_curpad[uv >> SAVE_TIGHT_SHIFT];
sv = *(SV**)ptr;
DEBUG_Xv(PerlIO_printf(Perl_debug_log,
"Pad 0x%"UVxf"[0x%"UVxf"] clearsv: %ld sv=0x%"UVxf"<%"IVdf"> %s\n",
PTR2UV(PL_comppad), PTR2UV(PL_curpad),
(long)((SV **)ptr-PL_curpad), PTR2UV(sv), (IV)SvREFCNT(sv),
(SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) ? "clear" : "abandon"
));
/* Can clear pad variable in place? */
if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) {
/*
* if a my variable that was made readonly is going out of
* scope, we want to remove the readonlyness so that it can
* go out of scope quietly
*/
if (SvPADMY(sv) && !SvFAKE(sv))
SvREADONLY_off(sv);
if (SvTHINKFIRST(sv))
sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF);
if (SvMAGICAL(sv))
mg_free(sv);
switch (SvTYPE(sv)) {
case SVt_NULL:
break;
case SVt_PVAV:
av_clear(MUTABLE_AV(sv));
break;
case SVt_PVHV:
hv_clear(MUTABLE_HV(sv));
break;
case SVt_PVCV:
Perl_croak(aTHX_ "panic: leave_scope pad code");
default:
SvOK_off(sv);
break;
}
SvPADSTALE_on(sv); /* mark as no longer live */
}
else { /* Someone has a claim on this, so abandon it. */
const U32 padflags = SvFLAGS(sv) & (SVs_PADMY|SVs_PADTMP);
switch (SvTYPE(sv)) { /* Console ourselves with a new value */
case SVt_PVAV: *(SV**)ptr = MUTABLE_SV(newAV()); break;
case SVt_PVHV: *(SV**)ptr = MUTABLE_SV(newHV()); break;
default: *(SV**)ptr = newSV(0); break;
}
SvREFCNT_dec(sv); /* Cast current value to the winds. */
/* preserve pad nature, but also mark as not live
* for any closure capturing */
SvFLAGS(*(SV**)ptr) |= padflags | SVs_PADSTALE;
}
break;
case SAVEt_DELETE:
ptr = SSPOPPTR;
hv = MUTABLE_HV(ptr);
i = SSPOPINT;
ptr = SSPOPPTR;
(void)hv_delete(hv, (char*)ptr, i, G_DISCARD);
SvREFCNT_dec(hv);
Safefree(ptr);
break;
case SAVEt_ADELETE:
ptr = SSPOPPTR;
av = MUTABLE_AV(ptr);
i = SSPOPINT;
(void)av_delete(av, i, G_DISCARD);
SvREFCNT_dec(av);
break;
case SAVEt_DESTRUCTOR_X:
ptr = SSPOPPTR;
(*SSPOPDXPTR)(aTHX_ ptr);
break;
case SAVEt_REGCONTEXT:
/* regexp must have croaked */
case SAVEt_ALLOC:
PL_savestack_ix -= uv >> SAVE_TIGHT_SHIFT;
break;
case SAVEt_STACK_POS: /* Position on Perl stack */
i = SSPOPINT;
PL_stack_sp = PL_stack_base + i;
break;
case SAVEt_STACK_CXPOS: /* blk_oldsp on context stack */
i = SSPOPINT;
cxstack[i].blk_oldsp = SSPOPINT;
break;
case SAVEt_AELEM: /* array element */
value = MUTABLE_SV(SSPOPPTR);
i = SSPOPINT;
av = MUTABLE_AV(SSPOPPTR);
ptr = av_fetch(av,i,1);
if (!AvREAL(av) && AvREIFY(av)) /* undo reify guard */
SvREFCNT_dec(value);
if (ptr) {
sv = *(SV**)ptr;
if (sv && sv != &PL_sv_undef) {
if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied))
SvREFCNT_inc_void_NN(sv);
goto restore_sv;
}
}
SvREFCNT_dec(av);
SvREFCNT_dec(value);
break;
case SAVEt_HELEM: /* hash element */
value = MUTABLE_SV(SSPOPPTR);
sv = MUTABLE_SV(SSPOPPTR);
hv = MUTABLE_HV(SSPOPPTR);
ptr = hv_fetch_ent(hv, sv, 1, 0);
SvREFCNT_dec(sv);
if (ptr) {
const SV * const oval = HeVAL((HE*)ptr);
if (oval && oval != &PL_sv_undef) {
ptr = &HeVAL((HE*)ptr);
if (SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
SvREFCNT_inc_void(*(SV**)ptr);
av = MUTABLE_AV(hv); /* what to refcnt_dec */
goto restore_sv;
}
}
SvREFCNT_dec(hv);
SvREFCNT_dec(value);
break;
case SAVEt_OP: