/* 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"
#include "feature.h"
SV**
Perl_stack_grow(pTHX_ SV **sp, SV **p, SSize_t n)
{
SSize_t extra;
SSize_t current = (p - PL_stack_base);
PERL_ARGS_ASSERT_STACK_GROW;
if (UNLIKELY(n < 0))
Perl_croak(aTHX_
"panic: stack_grow() negative count (%" IVdf ")", (IV)n);
PL_stack_sp = sp;
extra =
#ifdef STRESS_REALLOC
1;
#else
128;
#endif
/* If the total might wrap, panic instead. This is really testing
* that (current + n + extra < Stack_off_t_MAX), but done in a way that
* can't wrap */
if (UNLIKELY( current > Stack_off_t_MAX - extra
|| current + extra > Stack_off_t_MAX - n
))
/* diag_listed_as: Out of memory during %s extend */
Perl_croak(aTHX_ "Out of memory during stack extend");
av_extend(PL_curstack, current + n + extra);
#ifdef PERL_USE_HWM
PL_curstackinfo->si_stack_hwm = current + n + extra;
#endif
return PL_stack_sp;
}
#ifdef STRESS_REALLOC
#define GROW(old) ((old) + 1)
#else
#define GROW(old) ((old) * 3 / 2)
#endif
/* for backcomp */
PERL_SI *
Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems)
{
return new_stackinfo_flags(stitems, cxitems, 0);
}
/* current flag meanings:
* 1 make the new arg stack AvREAL
*/
PERL_SI *
Perl_new_stackinfo_flags(pTHX_ I32 stitems, I32 cxitems, UV flags)
{
PERL_SI *si;
Newx(si, 1, PERL_SI);
si->si_stack = newAV();
if (!(flags & 1))
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;
#ifdef PERL_RC_STACK
si->si_stack_nonrc_base = 0;
#endif
si->si_prev = 0;
si->si_next = 0;
si->si_cxmax = cxitems - 1;
si->si_cxix = -1;
si->si_cxsubix = -1;
si->si_type = PERLSI_UNDEF;
Newx(si->si_cxstack, cxitems, PERL_CONTEXT);
/* Without any kind of initialising CX_PUSHSUBST()
* in pp_subst() will read uninitialised heap. */
PoisonNew(si->si_cxstack, cxitems, PERL_CONTEXT);
return si;
}
I32
Perl_cxinc(pTHX)
{
const IV old_max = cxstack_max;
const IV new_max = GROW(cxstack_max);
Renew(cxstack, new_max + 1, PERL_CONTEXT);
cxstack_max = new_max;
/* Without any kind of initialising deep enough recursion
* will end up reading uninitialised PERL_CONTEXTs. */
PoisonNew(cxstack + old_max + 1, new_max - old_max, PERL_CONTEXT);
return cxstack_ix + 1;
}
/*
=for apidoc_section $callback
=for apidoc push_scope
Implements L<perlapi/C<ENTER>>
=cut
*/
void
Perl_push_scope(pTHX)
{
if (UNLIKELY(PL_scopestack_ix == PL_scopestack_max)) {
const IV new_max = GROW(PL_scopestack_max);
Renew(PL_scopestack, new_max, I32);
#ifdef DEBUGGING
Renew(PL_scopestack_name, new_max, const char*);
#endif
PL_scopestack_max = new_max;
}
#ifdef DEBUGGING
PL_scopestack_name[PL_scopestack_ix] = "unknown";
#endif
PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix;
}
/*
=for apidoc_section $callback
=for apidoc pop_scope
Implements L<perlapi/C<LEAVE>>
=cut
*/
void
Perl_pop_scope(pTHX)
{
const I32 oldsave = PL_scopestack[--PL_scopestack_ix];
LEAVE_SCOPE(oldsave);
}
Stack_off_t *
Perl_markstack_grow(pTHX)
{
const I32 oldmax = PL_markstack_max - PL_markstack;
const I32 newmax = GROW(oldmax);
Renew(PL_markstack, newmax, Stack_off_t);
PL_markstack_max = PL_markstack + newmax;
PL_markstack_ptr = PL_markstack + oldmax;
DEBUG_s(DEBUG_v(PerlIO_printf(Perl_debug_log,
"MARK grow %p %" IVdf " by %" IVdf "\n",
PL_markstack_ptr, (IV)*PL_markstack_ptr, (IV)oldmax)));
return PL_markstack_ptr;
}
void
Perl_savestack_grow(pTHX)
{
const I32 by = PL_savestack_max - PL_savestack_ix;
Perl_savestack_grow_cnt(aTHX_ by);
}
void
Perl_savestack_grow_cnt(pTHX_ I32 need)
{
/* NOTE: PL_savestack_max and PL_savestack_ix are I32.
*
* This makes sense when you consider that having I32_MAX items on
* the stack would be quite large.
*
* However, we use IV here so that we can detect if the new requested
* amount is larger than I32_MAX.
*/
const IV new_floor = PL_savestack_max + need; /* what we need */
/* the GROW() macro normally does scales by 1.5 but under
* STRESS_REALLOC it simply adds 1 */
IV new_max = GROW(new_floor); /* and some extra */
/* the new_max < PL_savestack_max is for cases where IV is I32
* and we have rolled over from I32_MAX to a small value */
if (new_max > I32_MAX || new_max < PL_savestack_max) {
if (new_floor > I32_MAX || new_floor < PL_savestack_max) {
Perl_croak(aTHX_ "panic: savestack overflows I32_MAX");
}
new_max = new_floor;
}
/* Note that we add an additional SS_MAXPUSH slots on top of
* PL_savestack_max so that SS_ADD_END(), SSGROW() etc can do
* a simper check and if necessary realloc *after* apparently
* overwriting the current PL_savestack_max. See scope.h.
*
* The +1 is because new_max/PL_savestack_max is the highest
* index, by Renew needs the number of items, which is one
* larger than the highest index. */
Renew(PL_savestack, new_max + SS_MAXPUSH + 1, ANY);
PL_savestack_max = new_max;
}
#undef GROW
/* The original function was called Perl_tmps_grow and was removed from public
API, Perl_tmps_grow_p is the replacement and it used in public macros but
isn't public itself.
Perl_tmps_grow_p takes a proposed ix. A proposed ix is PL_tmps_ix + extend_by,
where the result of (PL_tmps_ix + extend_by) is >= PL_tmps_max
Upon return, PL_tmps_stack[ix] will be a valid address. For machine code
optimization and register usage reasons, the proposed ix passed into
tmps_grow is returned to the caller which the caller can then use to write
an SV * to PL_tmps_stack[ix]. If the caller was using tmps_grow in
pre-extend mode (EXTEND_MORTAL macro), then it ignores the return value of
tmps_grow. Note, tmps_grow DOES NOT write ix to PL_tmps_ix, the caller
must assign ix or ret val of tmps_grow to PL_temps_ix themselves if that is
appropriate. The assignment to PL_temps_ix can happen before or after
tmps_grow call since tmps_grow doesn't look at PL_tmps_ix.
*/
SSize_t
Perl_tmps_grow_p(pTHX_ SSize_t ix)
{
SSize_t extend_to = ix;
#ifndef STRESS_REALLOC
SSize_t grow_size = PL_tmps_max < 512 ? 128 : PL_tmps_max / 2;
if (extend_to > SSize_t_MAX - grow_size - 1)
/* trigger memwrap message or fail allocation */
extend_to = SSize_t_MAX-1;
else
extend_to += grow_size;
#endif
Renew(PL_tmps_stack, extend_to + 1, SV*);
PL_tmps_max = extend_to + 1;
return ix;
}
void
Perl_free_tmps(pTHX)
{
/* XXX should tmps_floor live in cxstack? */
const SSize_t myfloor = PL_tmps_floor;
while (PL_tmps_ix > myfloor) { /* clean up after last statement */
SV* const sv = PL_tmps_stack[PL_tmps_ix--];
#ifdef PERL_POISON
PoisonWith(PL_tmps_stack + PL_tmps_ix + 1, 1, SV *, 0xAB);
#endif
if (LIKELY(sv)) {
SvTEMP_off(sv);
SvREFCNT_dec_NN(sv); /* note, can modify tmps_ix!!! */
}
}
}
/*
=for apidoc save_scalar_at
A helper function for localizing the SV referenced by C<*sptr>.
If C<SAVEf_KEEPOLDELEM> is set in in C<flags>, the function returns the input
scalar untouched.
Otherwise it replaces C<*sptr> with a new C<undef> scalar, and returns that.
The new scalar will have the old one's magic (if any) copied to it.
If there is such magic, and C<SAVEf_SETMAGIC> is set in in C<flags>, 'set'
magic will be processed on the new scalar. If unset, 'set' magic will be
skipped. The latter typically means that assignment will soon follow (I<e.g.>,
S<C<'local $x = $y'>>), and that will handle the magic.
=for apidoc Amnh ||SAVEf_KEEPOLDELEM
=for apidoc Amnh ||SAVEf_SETMAGIC
=cut
*/
STATIC SV *
S_save_scalar_at(pTHX_ SV **sptr, const U32 flags)
{
SV * osv;
SV *sv;
PERL_ARGS_ASSERT_SAVE_SCALAR_AT;
osv = *sptr;
if (flags & SAVEf_KEEPOLDELEM)
sv = osv;
else {
sv = (*sptr = newSV_type(SVt_NULL));
if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv))
mg_localize(osv, sv, cBOOL(flags & SAVEf_SETMAGIC));
}
return sv;
}
void
Perl_save_pushptrptr(pTHX_ void *const ptr1, void *const ptr2, const int type)
{
dSS_ADD;
SS_ADD_PTR(ptr1);
SS_ADD_PTR(ptr2);
SS_ADD_UV(type);
SS_ADD_END(3);
}
SV *
Perl_save_scalar(pTHX_ GV *gv)
{
SV ** const sptr = &GvSVn(gv);
PERL_ARGS_ASSERT_SAVE_SCALAR;
if (UNLIKELY(SvGMAGICAL(*sptr))) {
PL_localizing = 1;
(void)mg_get(*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 */
}
/*
=for apidoc save_generic_svref
Implements C<SAVEGENERICSV>.
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.
=cut
*/
void
Perl_save_generic_svref(pTHX_ SV **sptr)
{
PERL_ARGS_ASSERT_SAVE_GENERIC_SVREF;
save_pushptrptr(sptr, SvREFCNT_inc(*sptr), SAVEt_GENERIC_SVREF);
}
/*
=for apidoc save_rcpv
Implements C<SAVERCPV>.
Saves and restores a refcounted string, similar to what
save_generic_svref would do for a SV*. Can be used to restore
a refcounted string to its previous state. Performs the
appropriate refcount counting so that nothing should leak
or be prematurely freed.
=cut
*/
void
Perl_save_rcpv(pTHX_ char **prcpv) {
PERL_ARGS_ASSERT_SAVE_RCPV;
save_pushptrptr(prcpv, rcpv_copy(*prcpv), SAVEt_RCPV);
}
/*
=for apidoc save_freercpv
Implements C<SAVEFREERCPV>.
Saves and frees a refcounted string. Calls rcpv_free()
on the argument when the current pseudo block is finished.
=cut
*/
void
Perl_save_freercpv(pTHX_ char *rcpv) {
PERL_ARGS_ASSERT_SAVE_FREERCPV;
save_pushptr(rcpv, SAVEt_FREERCPV);
}
/*
=for apidoc_section $callback
=for apidoc save_generic_pvref
Implements C<SAVEGENERICPV>.
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.
=cut
*/
void
Perl_save_generic_pvref(pTHX_ char **str)
{
PERL_ARGS_ASSERT_SAVE_GENERIC_PVREF;
save_pushptrptr(*str, str, SAVEt_GENERIC_PVREF);
}
/*
=for apidoc_section $callback
=for apidoc save_shared_pvref
Implements C<SAVESHAREDPV>.
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.
=cut
*/
void
Perl_save_shared_pvref(pTHX_ char **str)
{
PERL_ARGS_ASSERT_SAVE_SHARED_PVREF;
save_pushptrptr(str, *str, SAVEt_SHARED_PVREF);
}
/*
=for apidoc_section $callback
=for apidoc save_set_svflags
Implements C<SAVESETSVFLAGS>.
Set the SvFLAGS specified by mask to the values in val
=cut
*/
void
Perl_save_set_svflags(pTHX_ SV* sv, U32 mask, U32 val)
{
dSS_ADD;
PERL_ARGS_ASSERT_SAVE_SET_SVFLAGS;
SS_ADD_PTR(sv);
SS_ADD_INT(mask);
SS_ADD_INT(val);
SS_ADD_UV(SAVEt_SET_SVFLAGS);
SS_ADD_END(4);
}
/*
=for apidoc_section $GV
=for apidoc save_gp
Saves the current GP of gv on the save stack to be restored on scope exit.
If C<empty> is true, replace the GP with a new GP.
If C<empty> is false, mark C<gv> with C<GVf_INTRO> so the next reference
assigned is localized, which is how S<C< local *foo = $someref; >> works.
=cut
*/
void
Perl_save_gp(pTHX_ GV *gv, I32 empty)
{
PERL_ARGS_ASSERT_SAVE_GP;
/* XXX For now, we just upgrade any coderef in the stash to a full GV
during localisation. Maybe at some point we could make localis-
ation work without needing the upgrade. (In which case our
callers should probably call a different function, not save_gp.)
*/
if (!isGV(gv)) {
assert(isGV_or_RVCV(gv));
(void)CvGV(SvRV((SV *)gv)); /* CvGV does the upgrade */
assert(isGV(gv));
}
save_pushptrptr(SvREFCNT_inc(gv), GvGP(gv), SAVEt_GP);
if (empty) {
GP *gp = Perl_newGP(aTHX_ gv);
HV * const stash = GvSTASH(gv);
bool isa_changed = 0;
if (stash && HvHasENAME(stash)) {
if (memEQs(GvNAME(gv), GvNAMELEN(gv), "ISA"))
isa_changed = TRUE;
else if (GvCVu(gv))
/* taking a method out of circulation ("local")*/
mro_method_changed_in(stash);
}
if (GvIOp(gv) && (IoFLAGS(GvIOp(gv)) & IOf_ARGV)) {
gp->gp_io = newIO();
IoFLAGS(gp->gp_io) |= IOf_ARGV|IOf_START;
}
GvGP_set(gv,gp);
if (isa_changed) mro_isa_changed_in(stash);
}
else {
gp_ref(GvGP(gv));
GvINTRO_on(gv);
}
}
AV *
Perl_save_ary(pTHX_ GV *gv)
{
AV * const oav = GvAVn(gv);
AV *av;
PERL_ARGS_ASSERT_SAVE_ARY;
if (UNLIKELY(!AvREAL(oav) && AvREIFY(oav)))
av_reify(oav);
save_pushptrptr(SvREFCNT_inc_simple_NN(gv), oav, SAVEt_AV);
GvAV(gv) = NULL;
av = GvAVn(gv);
if (UNLIKELY(SvMAGIC(oav)))
mg_localize(MUTABLE_SV(oav), MUTABLE_SV(av), TRUE);
return av;
}
HV *
Perl_save_hash(pTHX_ GV *gv)
{
HV *ohv, *hv;
PERL_ARGS_ASSERT_SAVE_HASH;
save_pushptrptr(
SvREFCNT_inc_simple_NN(gv), (ohv = GvHVn(gv)), SAVEt_HV
);
GvHV(gv) = NULL;
hv = GvHVn(gv);
if (UNLIKELY(SvMAGIC(ohv)))
mg_localize(MUTABLE_SV(ohv), MUTABLE_SV(hv), TRUE);
return hv;
}
void
Perl_save_item(pTHX_ SV *item)
{
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)
{
dSS_ADD;
PERL_ARGS_ASSERT_SAVE_BOOL;
SS_ADD_PTR(boolp);
SS_ADD_UV(SAVEt_BOOL | (*boolp << 8));
SS_ADD_END(2);
}
void
Perl_save_pushi32ptr(pTHX_ const I32 i, void *const ptr, const int type)
{
dSS_ADD;
SS_ADD_INT(i);
SS_ADD_PTR(ptr);
SS_ADD_UV(type);
SS_ADD_END(3);
}
void
Perl_save_int(pTHX_ int *intp)
{
const int i = *intp;
UV type = ((UV)((UV)i << SAVE_TIGHT_SHIFT) | SAVEt_INT_SMALL);
int size = 2;
dSS_ADD;
PERL_ARGS_ASSERT_SAVE_INT;
if (UNLIKELY((int)(type >> SAVE_TIGHT_SHIFT) != i)) {
SS_ADD_INT(i);
type = SAVEt_INT;
size++;
}
SS_ADD_PTR(intp);
SS_ADD_UV(type);
SS_ADD_END(size);
}
void
Perl_save_I8(pTHX_ I8 *bytep)
{
dSS_ADD;
PERL_ARGS_ASSERT_SAVE_I8;
SS_ADD_PTR(bytep);
SS_ADD_UV(SAVEt_I8 | ((UV)*bytep << 8));
SS_ADD_END(2);
}
void
Perl_save_I16(pTHX_ I16 *intp)
{
dSS_ADD;
PERL_ARGS_ASSERT_SAVE_I16;
SS_ADD_PTR(intp);
SS_ADD_UV(SAVEt_I16 | ((UV)*intp << 8));
SS_ADD_END(2);
}
void
Perl_save_I32(pTHX_ I32 *intp)
{
const I32 i = *intp;
UV type = ((I32)((U32)i << SAVE_TIGHT_SHIFT) | SAVEt_I32_SMALL);
int size = 2;
dSS_ADD;
PERL_ARGS_ASSERT_SAVE_I32;
if (UNLIKELY((I32)(type >> SAVE_TIGHT_SHIFT) != i)) {
SS_ADD_INT(i);
type = SAVEt_I32;
size++;
}
SS_ADD_PTR(intp);
SS_ADD_UV(type);
SS_ADD_END(size);
}
void
Perl_save_strlen(pTHX_ STRLEN *ptr)
{
const IV i = *ptr;
UV type = ((I32)((U32)i << SAVE_TIGHT_SHIFT) | SAVEt_STRLEN_SMALL);
int size = 2;
dSS_ADD;
PERL_ARGS_ASSERT_SAVE_STRLEN;
if (UNLIKELY((I32)(type >> SAVE_TIGHT_SHIFT) != i)) {
SS_ADD_IV(*ptr);
type = SAVEt_STRLEN;
size++;
}
SS_ADD_PTR(ptr);
SS_ADD_UV(type);
SS_ADD_END(size);
}
void
Perl_save_iv(pTHX_ IV *ivp)
{
PERL_ARGS_ASSERT_SAVE_IV;
SSGROW(3);
SSPUSHIV(*ivp);
SSPUSHPTR(ivp);
SSPUSHUV(SAVEt_IV);
}
/* 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)
{
PERL_ARGS_ASSERT_SAVE_PPTR;
save_pushptrptr(*pptr, pptr, SAVEt_PPTR);
}
/*
=for apidoc_section $callback
=for apidoc save_vptr
Implements C<SAVEVPTR>.
=cut
*/
void
Perl_save_vptr(pTHX_ void *ptr)
{
PERL_ARGS_ASSERT_SAVE_VPTR;
save_pushptrptr(*(char**)ptr, ptr, SAVEt_VPTR);
}
void
Perl_save_sptr(pTHX_ SV **sptr)
{
PERL_ARGS_ASSERT_SAVE_SPTR;
save_pushptrptr(*sptr, sptr, SAVEt_SPTR);
}
/*
=for apidoc_section $callback
=for apidoc save_padsv_and_mortalize
Implements C<SAVEPADSVANDMORTALIZE>.
=cut
*/
void
Perl_save_padsv_and_mortalize(pTHX_ PADOFFSET off)
{
dSS_ADD;
ASSERT_CURPAD_ACTIVE("save_padsv");
SS_ADD_PTR(SvREFCNT_inc_simple_NN(PL_curpad[off]));
SS_ADD_PTR(PL_comppad);
SS_ADD_UV((UV)off);
SS_ADD_UV(SAVEt_PADSV_AND_MORTALIZE);
SS_ADD_END(4);
}
void
Perl_save_hptr(pTHX_ HV **hptr)
{
PERL_ARGS_ASSERT_SAVE_HPTR;
save_pushptrptr(*hptr, hptr, SAVEt_HPTR);
}
void
Perl_save_aptr(pTHX_ AV **aptr)
{
PERL_ARGS_ASSERT_SAVE_APTR;
save_pushptrptr(*aptr, aptr, SAVEt_APTR);
}
/*
=for apidoc_section $callback
=for apidoc save_pushptr
The refcnt of object C<ptr> will be decremented at the end of the current
I<pseudo-block>. C<type> gives the type of C<ptr>, expressed as one of the
constants in F<scope.h> whose name begins with C<SAVEt_>.
This is the underlying implementation of several macros, like
C<SAVEFREESV>.
=cut
*/
void
Perl_save_pushptr(pTHX_ void *const ptr, const int type)
{
dSS_ADD;
SS_ADD_PTR(ptr);
SS_ADD_UV(type);
SS_ADD_END(2);
}
void
Perl_save_clearsv(pTHX_ SV **svp)
{
const UV offset = svp - PL_curpad;
const UV offset_shifted = offset << SAVE_TIGHT_SHIFT;
PERL_ARGS_ASSERT_SAVE_CLEARSV;
ASSERT_CURPAD_ACTIVE("save_clearsv");
assert(*svp);
SvPADSTALE_off(*svp); /* mark lexical as active */
if (UNLIKELY((offset_shifted >> SAVE_TIGHT_SHIFT) != offset)) {
Perl_croak(aTHX_ "panic: pad offset %" UVuf " out of range (%p-%p)",
offset, svp, PL_curpad);
}
{
dSS_ADD;
SS_ADD_UV(offset_shifted | SAVEt_CLEARSV);
SS_ADD_END(1);
}
}
void
Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen)
{
PERL_ARGS_ASSERT_SAVE_DELETE;
save_pushptri32ptr(key, klen, SvREFCNT_inc_simple(hv), SAVEt_DELETE);
}
/*
=for apidoc_section $callback
=for apidoc save_hdelete
Implements C<SAVEHDELETE>.
=cut
*/
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);
}
/*
=for apidoc_section $callback
=for apidoc save_adelete
Implements C<SAVEADELETE>.
=cut
*/
void
Perl_save_adelete(pTHX_ AV *av, SSize_t key)
{
dSS_ADD;
PERL_ARGS_ASSERT_SAVE_ADELETE;
SvREFCNT_inc_void(av);
SS_ADD_UV(key);
SS_ADD_PTR(av);
SS_ADD_IV(SAVEt_ADELETE);
SS_ADD_END(3);
}
void
Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p)
{
dSS_ADD;
PERL_ARGS_ASSERT_SAVE_DESTRUCTOR;
SS_ADD_DPTR(f);
SS_ADD_PTR(p);
SS_ADD_UV(SAVEt_DESTRUCTOR);
SS_ADD_END(3);
}
void
Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p)
{
dSS_ADD;
SS_ADD_DXPTR(f);
SS_ADD_PTR(p);
SS_ADD_UV(SAVEt_DESTRUCTOR_X);
SS_ADD_END(3);
}
/*
=for apidoc_section $callback
=for apidoc save_hints
Implements C<SAVEHINTS>.
=cut
*/
void
Perl_save_hints(pTHX)
{
COPHH *save_cophh = cophh_copy(CopHINTHASH_get(&PL_compiling));
if (PL_hints & HINT_LOCALIZE_HH) {
HV *oldhh = GvHV(PL_hintgv);
{
dSS_ADD;
SS_ADD_INT(PL_hints);
SS_ADD_PTR(save_cophh);
SS_ADD_PTR(oldhh);
SS_ADD_UV(SAVEt_HINTS_HH | (PL_prevailing_version << 8));
SS_ADD_END(4);
}
GvHV(PL_hintgv) = NULL; /* in case copying dies */
GvHV(PL_hintgv) = hv_copy_hints_hv(oldhh);
SAVEFEATUREBITS();
} else {
save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS | (PL_prevailing_version << 8));
}
}
static void
S_save_pushptri32ptr(pTHX_ void *const ptr1, const I32 i, void *const ptr2,
const int type)
{
dSS_ADD;
SS_ADD_PTR(ptr1);
SS_ADD_INT(i);
SS_ADD_PTR(ptr2);
SS_ADD_UV(type);
SS_ADD_END(4);
}
/*
=for apidoc_section $callback
=for apidoc save_aelem
=for apidoc_item save_aelem_flags
These each arrange for the value of the array element C<av[idx]> to be restored
at the end of the enclosing I<pseudo-block>.
In C<save_aelem>, the SV at C**sptr> will be replaced by a new C<undef>
scalar. That scalar will inherit any magic from the original C<**sptr>,
and any 'set' magic will be processed.
In C<save_aelem_flags>, C<SAVEf_KEEPOLDELEM> being set in C<flags> causes
the function to forgo all that: the scalar at C<**sptr> is untouched.
If C<SAVEf_KEEPOLDELEM> is not set, the SV at C**sptr> will be replaced by a
new C<undef> scalar. That scalar will inherit any magic from the original
C<**sptr>. Any 'set' magic will be processed if and only if C<SAVEf_SETMAGIC>
is set in in C<flags>.
=cut
*/
void
Perl_save_aelem_flags(pTHX_ AV *av, SSize_t idx, SV **sptr,
const U32 flags)
{
dSS_ADD;
SV *sv;
PERL_ARGS_ASSERT_SAVE_AELEM_FLAGS;
SvGETMAGIC(*sptr);
SS_ADD_PTR(SvREFCNT_inc_simple(av));
SS_ADD_IV(idx);
SS_ADD_PTR(SvREFCNT_inc(*sptr));
SS_ADD_UV(SAVEt_AELEM);
SS_ADD_END(4);
/* The array needs to hold a reference count on its new element, so it
must be AvREAL. */
if (UNLIKELY(!AvREAL(av) && AvREIFY(av)))
av_reify(av);
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 (UNLIKELY(SvTIED_mg((const SV *)av, PERL_MAGIC_tied)))
sv_2mortal(sv);
}
/*
=for apidoc_section $callback
=for apidoc save_helem
=for apidoc_item save_helem_flags
These each arrange for the value of the hash element (in Perlish terms)
C<$hv{key}]> to be restored at the end of the enclosing I<pseudo-block>.
In C<save_helem>, the SV at C**sptr> will be replaced by a new C<undef>
scalar. That scalar will inherit any magic from the original C<**sptr>,
and any 'set' magic will be processed.
In C<save_helem_flags>, C<SAVEf_KEEPOLDELEM> being set in C<flags> causes
the function to forgo all that: the scalar at C<**sptr> is untouched.
If C<SAVEf_KEEPOLDELEM> is not set, the SV at C**sptr> will be replaced by a
new C<undef> scalar. That scalar will inherit any magic from the original
C<**sptr>. Any 'set' magic will be processed if and only if C<SAVEf_SETMAGIC>
is set in in C<flags>.
=cut
*/
void
Perl_save_helem_flags(pTHX_ HV *hv, SV *key, SV **sptr, const U32 flags)
{
SV *sv;
PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS;
SvGETMAGIC(*sptr);
{
dSS_ADD;
SS_ADD_PTR(SvREFCNT_inc_simple(hv));
SS_ADD_PTR(newSVsv(key));
SS_ADD_PTR(SvREFCNT_inc(*sptr));
SS_ADD_UV(SAVEt_HELEM);
SS_ADD_END(4);
}
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 (UNLIKELY(SvTIED_mg((const SV *)hv, PERL_MAGIC_tied)))
sv_2mortal(sv);
}
SV*
Perl_save_svref(pTHX_ SV **sptr)
{
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 */
}
void
Perl_savetmps(pTHX)
{
dSS_ADD;
SS_ADD_IV(PL_tmps_floor);
PL_tmps_floor = PL_tmps_ix;
SS_ADD_UV(SAVEt_TMPSFLOOR);
SS_ADD_END(2);
}
/*
=for apidoc_section $stack
=for apidoc save_alloc
Implements L<perlapi/C<SSNEW>> and kin, which should be used instead of this
function.
=cut
*/
SSize_t
Perl_save_alloc(pTHX_ SSize_t size, I32 pad)
{
const SSize_t 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 (UNLIKELY((elems_shifted >> SAVE_TIGHT_SHIFT) != elems))
Perl_croak(aTHX_
"panic: save_alloc elems %" UVuf " out of range (%" IVdf "-%" IVdf ")",
elems, (IV)size, (IV)pad);
SSGROW(elems + 1);
PL_savestack_ix += elems;
SSPUSHUV(SAVEt_ALLOC | elems_shifted);
return start;
}
/*
=for apidoc_section $callback
=for apidoc leave_scope
Implements C<LEAVE_SCOPE> which you should use instead.
=cut
*/
void
Perl_leave_scope(pTHX_ I32 base)
{
/* Localise the effects of the TAINT_NOT inside the loop. */
bool was = TAINT_get;
if (UNLIKELY(base < -1))
Perl_croak(aTHX_ "panic: corrupt saved stack index %ld", (long) base);
DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
(long)PL_savestack_ix, (long)base));
while (PL_savestack_ix > base) {
UV uv;
U8 type;
ANY *ap; /* arg pointer */
ANY a0, a1, a2; /* up to 3 args */
TAINT_NOT;
{
U8 argcount;
I32 ix = PL_savestack_ix - 1;
ap = &PL_savestack[ix];
uv = ap->any_uv;
type = (U8)uv & SAVE_MASK;
argcount = leave_scope_arg_counts[type];
PL_savestack_ix = ix - argcount;
ap -= argcount;
}
switch (type) {
case SAVEt_ITEM: /* normal string */
a0 = ap[0]; a1 = ap[1];
sv_replace(a0.any_sv, a1.any_sv);
if (UNLIKELY(SvSMAGICAL(a0.any_sv))) {
PL_localizing = 2;
mg_set(a0.any_sv);
PL_localizing = 0;
}
break;
/* This would be a mathom, but Perl_save_svref() calls a static
function, S_save_scalar_at(), so has to stay in this file. */
case SAVEt_SVREF: /* scalar reference */
a0 = ap[0]; a1 = ap[1];
a2.any_svp = a0.any_svp;
a0.any_sv = NULL; /* what to refcnt_dec */
goto restore_sv;
case SAVEt_SV: /* scalar reference */
a0 = ap[0]; a1 = ap[1];
a2.any_svp = &GvSV(a0.any_gv);
restore_sv:
{
/* do *a2.any_svp = a1 and free a0 */
SV * const sv = *a2.any_svp;
*a2.any_svp = a1.any_sv;
SvREFCNT_dec(sv);
if (UNLIKELY(SvSMAGICAL(a1.any_sv))) {
/* mg_set could die, skipping the freeing of a0 and
* a1; Ensure that they're always freed in that case */
dSS_ADD;
SS_ADD_PTR(a1.any_sv);
SS_ADD_UV(SAVEt_FREESV);
SS_ADD_PTR(a0.any_sv);
SS_ADD_UV(SAVEt_FREESV);
SS_ADD_END(4);
PL_localizing = 2;
mg_set(a1.any_sv);
PL_localizing = 0;
break;
}
SvREFCNT_dec_NN(a1.any_sv);
SvREFCNT_dec(a0.any_sv);
break;
}
case SAVEt_GENERIC_PVREF: /* generic pv */
a0 = ap[0]; a1 = ap[1];
if (*a1.any_pvp != a0.any_pv) {
Safefree(*a1.any_pvp);
*a1.any_pvp = a0.any_pv;
}
break;
case SAVEt_SHARED_PVREF: /* shared pv */
a0 = ap[0]; a1 = ap[1];
if (*a0.any_pvp != a1.any_pv) {
PerlMemShared_free(*a0.any_pvp);
*a0.any_pvp = a1.any_pv;
}
break;
case SAVEt_GVSV: /* scalar slot in GV */
a0 = ap[0]; a1 = ap[1];
a0.any_svp = &GvSV(a0.any_gv);
goto restore_svp;
case SAVEt_GENERIC_SVREF: /* generic sv */
a0 = ap[0]; a1 = ap[1];
restore_svp:
{
/* do *a0.any_svp = a1 */
SV * const sv = *a0.any_svp;
*a0.any_svp = a1.any_sv;
SvREFCNT_dec(sv);
SvREFCNT_dec(a1.any_sv);
break;
}
case SAVEt_RCPV: /* like generic sv, but for struct rcpv */
{
a0 = ap[0]; a1 = ap[1];
char *old = *a0.any_pvp;
*a0.any_pvp = a1.any_pv;
(void)rcpv_free(old);
(void)rcpv_free(a1.any_pv);
break;
}
case SAVEt_FREERCPV: /* like SAVEt_FREEPV but for a RCPV */
{
a0 = ap[0];
char *rcpv = a0.any_pv;
(void)rcpv_free(rcpv);
break;
}
case SAVEt_GVSLOT: /* any slot in GV */
{
HV * hv;
a0 = ap[0]; a1 = ap[1]; a2 = ap[2];
hv = GvSTASH(a0.any_gv);
if (hv && HvHasENAME(hv) && (
(a2.any_sv && SvTYPE(a2.any_sv) == SVt_PVCV)
|| (*a1.any_svp && SvTYPE(*a1.any_svp) == SVt_PVCV)
))
{
if ((char *)a1.any_svp < (char *)GvGP(a0.any_gv)
|| (char *)a1.any_svp > (char *)GvGP(a0.any_gv) + sizeof(struct gp)
|| GvREFCNT(a0.any_gv) > 2) /* "> 2" to ignore savestack's ref */
PL_sub_generation++;
else mro_method_changed_in(hv);
}
a0.any_svp = a1.any_svp;
a1.any_sv = a2.any_sv;
goto restore_svp;
}
case SAVEt_AV: /* array reference */
a0 = ap[0]; a1 = ap[1];
SvREFCNT_dec(GvAV(a0.any_gv));
GvAV(a0.any_gv) = a1.any_av;
avhv_common:
if (UNLIKELY(SvSMAGICAL(a1.any_sv))) {
/* mg_set might die, so make sure a0 isn't leaked */
dSS_ADD;
SS_ADD_PTR(a0.any_sv);
SS_ADD_UV(SAVEt_FREESV);
SS_ADD_END(2);
PL_localizing = 2;
mg_set(a1.any_sv);
PL_localizing = 0;
break;
}
SvREFCNT_dec_NN(a0.any_sv);
break;
case SAVEt_HV: /* hash reference */
a0 = ap[0]; a1 = ap[1];
SvREFCNT_dec(GvHV(a0.any_gv));
GvHV(a0.any_gv) = a1.any_hv;
goto avhv_common;
case SAVEt_INT_SMALL:
a0 = ap[0];
*(int*)a0.any_ptr = (int)(uv >> SAVE_TIGHT_SHIFT);
break;
case SAVEt_INT: /* int reference */
a0 = ap[0]; a1 = ap[1];
*(int*)a1.any_ptr = (int)a0.any_i32;
break;
case SAVEt_STRLEN_SMALL:
a0 = ap[0];
*(STRLEN*)a0.any_ptr = (STRLEN)(uv >> SAVE_TIGHT_SHIFT);
break;
case SAVEt_STRLEN: /* STRLEN/size_t ref */
a0 = ap[0]; a1 = ap[1];
*(STRLEN*)a1.any_ptr = (STRLEN)a0.any_iv;
break;
case SAVEt_TMPSFLOOR: /* restore PL_tmps_floor */
a0 = ap[0];
PL_tmps_floor = (SSize_t)a0.any_iv;
break;
case SAVEt_BOOL: /* bool reference */
a0 = ap[0];
*(bool*)a0.any_ptr = cBOOL(uv >> 8);
#ifdef NO_TAINT_SUPPORT
PERL_UNUSED_VAR(was);
#else
if (UNLIKELY(a0.any_ptr == &(PL_tainted))) {
/* If we don't update <was>, to reflect what was saved on the
* stack for PL_tainted, then we will overwrite this attempt to
* restore it when we exit this routine. Note that this won't
* work if this value was saved in a wider-than necessary type,
* such as I32 */
was = *(bool*)a0.any_ptr;
}
#endif
break;
case SAVEt_I32_SMALL:
a0 = ap[0];
*(I32*)a0.any_ptr = (I32)(uv >> SAVE_TIGHT_SHIFT);
break;
case SAVEt_I32: /* I32 reference */
a0 = ap[0]; a1 = ap[1];
#ifdef PERL_DEBUG_READONLY_OPS
if (*(I32*)a1.any_ptr != a0.any_i32)
#endif
*(I32*)a1.any_ptr = a0.any_i32;
break;
case SAVEt_SPTR: /* SV* reference */
case SAVEt_VPTR: /* random* reference */
case SAVEt_PPTR: /* char* reference */
case SAVEt_HPTR: /* HV* reference */
case SAVEt_APTR: /* AV* reference */
a0 = ap[0]; a1 = ap[1];
*a1.any_svp= a0.any_sv;
break;
case SAVEt_GP: /* scalar reference */
{
HV *hv;
bool had_method;
a0 = ap[0]; a1 = ap[1];
/* possibly taking a method out of circulation */
had_method = cBOOL(GvCVu(a0.any_gv));
gp_free(a0.any_gv);
GvGP_set(a0.any_gv, (GP*)a1.any_ptr);
if ((hv=GvSTASH(a0.any_gv)) && HvHasENAME(hv)) {
if (memEQs(GvNAME(a0.any_gv), GvNAMELEN(a0.any_gv), "ISA"))
mro_isa_changed_in(hv);
else if (had_method || GvCVu(a0.any_gv))
/* putting a method back into circulation ("local")*/
gv_method_changed(a0.any_gv);
}
SvREFCNT_dec_NN(a0.any_gv);
break;
}
case SAVEt_FREESV:
a0 = ap[0];
SvREFCNT_dec(a0.any_sv);
break;
case SAVEt_FREEPADNAME:
a0 = ap[0];
PadnameREFCNT_dec((PADNAME *)a0.any_ptr);
break;
case SAVEt_FREECOPHH:
a0 = ap[0];
cophh_free((COPHH *)a0.any_ptr);
break;
case SAVEt_MORTALIZESV:
a0 = ap[0];
sv_2mortal(a0.any_sv);
break;
case SAVEt_FREEOP:
a0 = ap[0];
ASSERT_CURPAD_LEGAL("SAVEt_FREEOP");
op_free(a0.any_op);
break;
case SAVEt_FREEPV:
a0 = ap[0];
Safefree(a0.any_ptr);
break;
case SAVEt_CLEARPADRANGE:
{
I32 i;
SV **svp;
i = (I32)((uv >> SAVE_TIGHT_SHIFT) & OPpPADRANGE_COUNTMASK);
svp = &PL_curpad[uv >>
(OPpPADRANGE_COUNTSHIFT + SAVE_TIGHT_SHIFT)] + i - 1;
goto clearsv;
case SAVEt_CLEARSV:
svp = &PL_curpad[uv >> SAVE_TIGHT_SHIFT];
i = 1;
clearsv:
for (; i; i--, svp--) {
SV *sv = *svp;
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)(svp-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)) {
/* these flags are the union of all the relevant flags
* in the individual conditions within */
if (UNLIKELY(SvFLAGS(sv) & (
SVf_READONLY|SVf_PROTECT /*for SvREADONLY_off*/
| (SVs_GMG|SVs_SMG|SVs_RMG) /* SvMAGICAL() */
| SVf_OOK
| SVf_THINKFIRST)))
{
/* 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 (SvREADONLY(sv))
SvREADONLY_off(sv);
if (SvTYPE(sv) == SVt_PVHV && HvHasAUX(sv))
Perl_hv_kill_backrefs(aTHX_ MUTABLE_HV(sv));
else if(SvOOK(sv))
sv_backoff(sv);
if (SvMAGICAL(sv)) {
/* note that backrefs (either in HvAUX or magic)
* must be removed before other magic */
sv_unmagic(sv, PERL_MAGIC_backref);
if (SvTYPE(sv) != SVt_PVCV)
mg_free(sv);
}
if (SvTHINKFIRST(sv))
sv_force_normal_flags(sv, SV_IMMEDIATE_UNREF
|SV_COW_DROP_PV);
}
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:
{
HEK *hek = CvGvNAME_HEK(sv);
assert(hek);
(void)share_hek_hek(hek);
cv_undef((CV *)sv);
CvNAME_HEK_set(sv, hek);
CvLEXICAL_on(sv);
break;
}
default:
/* This looks odd, but these two macros are for use in
expressions and finish with a trailing comma, so
adding a ; after them would be wrong. */
assert_not_ROK(sv)
assert_not_glob(sv)
SvFLAGS(sv) &=~ (SVf_OK|SVf_IVisUV|SVf_UTF8);
break;
}
SvPADTMP_off(sv);
SvPADSTALE_on(sv); /* mark as no longer live */
}
else { /* Someone has a claim on this, so abandon it. */
switch (SvTYPE(sv)) { /* Console ourselves with a new value */
case SVt_PVAV: *svp = MUTABLE_SV(newAV()); break;
case SVt_PVHV: *svp = MUTABLE_SV(newHV()); break;
case SVt_PVCV:
{
HEK * const hek = CvGvNAME_HEK(sv);
/* Create a stub */
*svp = newSV_type(SVt_PVCV);
/* Share name */
CvNAME_HEK_set(*svp,
share_hek_hek(hek));
CvLEXICAL_on(*svp);
break;
}
default: *svp = newSV_type(SVt_NULL); break;
}
SvREFCNT_dec_NN(sv); /* Cast current value to the winds. */
/* preserve pad nature, but also mark as not live
* for any closure capturing */
SvFLAGS(*svp) |= SVs_PADSTALE;
}
}
break;
}
case SAVEt_DELETE:
a0 = ap[0]; a1 = ap[1]; a2 = ap[2];
/* hv_delete could die, so free the key and SvREFCNT_dec the
* hv by pushing new save actions
*/
/* ap[0] is the key */
ap[1].any_uv = SAVEt_FREEPV; /* was len */
/* ap[2] is the hv */
ap[3].any_uv = SAVEt_FREESV; /* was SAVEt_DELETE */
PL_savestack_ix += 4;
(void)hv_delete(a2.any_hv, a0.any_pv, a1.any_i32, G_DISCARD);
break;
case SAVEt_ADELETE:
a0 = ap[0]; a1 = ap[1];
/* av_delete could die, so SvREFCNT_dec the av by pushing a
* new save action
*/
ap[0].any_av = a1.any_av;
ap[1].any_uv = SAVEt_FREESV;
PL_savestack_ix += 2;
(void)av_delete(a1.any_av, a0.any_iv, G_DISCARD);
break;
case SAVEt_DESTRUCTOR_X:
a0 = ap[0]; a1 = ap[1];
(*a0.any_dxptr)(aTHX_ a1.any_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 */
#ifdef PERL_RC_STACK
/* DAPM Jan 2023. I don't think this save type is used any
* more, but if some XS code uses it, fail it for now, as
* it's not clear to me what perl should be doing to stack ref
* counts when arbitrarily resetting the stack pointer.
*/
assert(0);
#endif
a0 = ap[0];
PL_stack_sp = PL_stack_base + a0.any_i32;
break;
case SAVEt_AELEM: /* array element */
{
SV **svp;
a0 = ap[0]; a1 = ap[1]; a2 = ap[2];
svp = av_fetch(a0.any_av, a1.any_iv, 1);
if (UNLIKELY(!AvREAL(a0.any_av) && AvREIFY(a0.any_av))) /* undo reify guard */
SvREFCNT_dec(a2.any_sv);
if (LIKELY(svp)) {
SV * const sv = *svp;
if (LIKELY(sv && sv != &PL_sv_undef)) {
if (UNLIKELY(SvTIED_mg((const SV *)a0.any_av, PERL_MAGIC_tied)))
SvREFCNT_inc_void_NN(sv);
a1.any_sv = a2.any_sv;
a2.any_svp = svp;
goto restore_sv;
}
}
SvREFCNT_dec(a0.any_av);
SvREFCNT_dec(a2.any_sv);
break;
}
case SAVEt_HELEM: /* hash element */
{
HE *he;
a0 = ap[0]; a1 = ap[1]; a2 = ap[2];
he = hv_fetch_ent(a0.any_hv, a1.any_sv, 1, 0);
SvREFCNT_dec(a1.any_sv);
if (LIKELY(he)) {
const SV * const oval = HeVAL(he);
if (LIKELY(oval && oval != &PL_sv_undef)) {
SV **svp = &HeVAL(he);
if (UNLIKELY(SvTIED_mg((const SV *)a0.any_hv, PERL_MAGIC_tied)))
SvREFCNT_inc_void(*svp);
a1.any_sv = a2.any_sv;
a2.any_svp = svp;
goto restore_sv;
}
}
SvREFCNT_dec(a0.any_hv);
SvREFCNT_dec(a2.any_sv);
break;
}
case SAVEt_OP:
a0 = ap[0];
PL_op = (OP*)a0.any_ptr;
break;
case SAVEt_HINTS_HH:
a2 = ap[2];
/* FALLTHROUGH */
case SAVEt_HINTS:
a0 = ap[0]; a1 = ap[1];
if ((PL_hints & HINT_LOCALIZE_HH)) {
while (GvHV(PL_hintgv)) {
HV *hv = GvHV(PL_hintgv);
GvHV(PL_hintgv) = NULL;
SvREFCNT_dec(MUTABLE_SV(hv));
}
}
cophh_free(CopHINTHASH_get(&PL_compiling));
CopHINTHASH_set(&PL_compiling, (COPHH*)a1.any_ptr);
*(I32*)&PL_hints = a0.any_i32;
PL_prevailing_version = (U16)(uv >> 8);
if (type == SAVEt_HINTS_HH) {
SvREFCNT_dec(MUTABLE_SV(GvHV(PL_hintgv)));
GvHV(PL_hintgv) = MUTABLE_HV(a2.any_ptr);
}
if (!GvHV(PL_hintgv)) {
/* Need to add a new one manually, else rv2hv can
add one via GvHVn and it won't have the magic set. */
HV *const hv = newHV();
hv_magic(hv, NULL, PERL_MAGIC_hints);
GvHV(PL_hintgv) = hv;
}
assert(GvHV(PL_hintgv));
break;
case SAVEt_COMPPAD:
a0 = ap[0];
PL_comppad = (PAD*)a0.any_ptr;
if (LIKELY(PL_comppad))
PL_curpad = AvARRAY(PL_comppad);
else
PL_curpad = NULL;
break;
case SAVEt_PADSV_AND_MORTALIZE:
{
SV **svp;
a0 = ap[0]; a1 = ap[1]; a2 = ap[2];
assert (a1.any_ptr);
svp = AvARRAY((PAD*)a1.any_ptr) + (PADOFFSET)a2.any_uv;
/* This mortalizing used to be done by CX_POOPLOOP() via
itersave. But as we have all the information here, we
can do it here, save even having to have itersave in
the struct.
*/
sv_2mortal(*svp);
*svp = a0.any_sv;
}
break;
case SAVEt_SAVESWITCHSTACK:
{
dSP;
a0 = ap[0]; a1 = ap[1];
SWITCHSTACK(a1.any_av, a0.any_av);
PL_curstackinfo->si_stack = a0.any_av;
}
break;
case SAVEt_SET_SVFLAGS:
a0 = ap[0]; a1 = ap[1]; a2 = ap[2];
SvFLAGS(a0.any_sv) &= ~(a1.any_u32);
SvFLAGS(a0.any_sv) |= a2.any_u32;
break;
/* These are only saved in mathoms.c */
case SAVEt_NSTAB:
a0 = ap[0];
(void)sv_clear(a0.any_sv);
break;
case SAVEt_LONG: /* long reference */
a0 = ap[0]; a1 = ap[1];
*(long*)a1.any_ptr = a0.any_long;
break;
case SAVEt_IV: /* IV reference */
a0 = ap[0]; a1 = ap[1];
*(IV*)a1.any_ptr = a0.any_iv;
break;
case SAVEt_I16: /* I16 reference */
a0 = ap[0];
*(I16*)a0.any_ptr = (I16)(uv >> 8);
break;
case SAVEt_I8: /* I8 reference */
a0 = ap[0];
*(I8*)a0.any_ptr = (I8)(uv >> 8);
break;
case SAVEt_DESTRUCTOR:
a0 = ap[0]; a1 = ap[1];
(*a0.any_dptr)(a1.any_ptr);
break;
case SAVEt_COMPILE_WARNINGS:
/* NOTE: we can't put &PL_compiling or PL_curcop on the save
* stack directly, as we currently cannot translate
* them to the correct addresses after a thread start
* or win32 fork start. - Yves
*/
a0 = ap[0];
free_and_set_cop_warnings(&PL_compiling, a0.any_pv);
break;
case SAVEt_CURCOP_WARNINGS:
/* NOTE: see comment above about SAVEt_COMPILE_WARNINGS */
a0 = ap[0];
free_and_set_cop_warnings(PL_curcop, a0.any_pv);
break;
case SAVEt_PARSER:
a0 = ap[0];
parser_free((yy_parser *)a0.any_ptr);
break;
case SAVEt_READONLY_OFF:
a0 = ap[0];
SvREADONLY_off(a0.any_sv);
break;
default:
Perl_croak(aTHX_ "panic: leave_scope inconsistency %u",
(U8)uv & SAVE_MASK);
}
}
TAINT_set(was);
}
void
Perl_cx_dump(pTHX_ PERL_CONTEXT *cx)
{
PERL_ARGS_ASSERT_CX_DUMP;
#ifdef DEBUGGING
PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]);
if (CxTYPE(cx) != CXt_SUBST) {
const char *gimme_text;
PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp);
PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%" UVxf "\n",
PTR2UV(cx->blk_oldcop));
PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp);
PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp);
PerlIO_printf(Perl_debug_log, "BLK_OLDSAVEIX = %ld\n", (long)cx->blk_oldsaveix);
PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%" UVxf "\n",
PTR2UV(cx->blk_oldpm));
switch (cx->blk_gimme) {
case G_VOID:
gimme_text = "VOID";
break;
case G_SCALAR:
gimme_text = "SCALAR";
break;
case G_LIST:
gimme_text = "LIST";
break;
default:
gimme_text = "UNKNOWN";
break;
}
PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", gimme_text);
}
switch (CxTYPE(cx)) {
case CXt_NULL:
case CXt_BLOCK:
case CXt_DEFER:
break;
case CXt_FORMAT:
PerlIO_printf(Perl_debug_log, "BLK_FORMAT.CV = 0x%" UVxf "\n",
PTR2UV(cx->blk_format.cv));
PerlIO_printf(Perl_debug_log, "BLK_FORMAT.GV = 0x%" UVxf "\n",
PTR2UV(cx->blk_format.gv));
PerlIO_printf(Perl_debug_log, "BLK_FORMAT.DFOUTGV = 0x%" UVxf "\n",
PTR2UV(cx->blk_format.dfoutgv));
PerlIO_printf(Perl_debug_log, "BLK_FORMAT.HASARGS = %d\n",
(int)CxHASARGS(cx));
PerlIO_printf(Perl_debug_log, "BLK_FORMAT.RETOP = 0x%" UVxf "\n",
PTR2UV(cx->blk_format.retop));
break;
case CXt_SUB:
PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%" UVxf "\n",
PTR2UV(cx->blk_sub.cv));
PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n",
(long)cx->blk_sub.olddepth);
PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n",
(int)CxHASARGS(cx));
PerlIO_printf(Perl_debug_log, "BLK_SUB.LVAL = %d\n", (int)CxLVAL(cx));
PerlIO_printf(Perl_debug_log, "BLK_SUB.RETOP = 0x%" UVxf "\n",
PTR2UV(cx->blk_sub.retop));
break;
case CXt_EVAL:
PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n",
(long)CxOLD_IN_EVAL(cx));
PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n",
PL_op_name[CxOLD_OP_TYPE(cx)],
PL_op_desc[CxOLD_OP_TYPE(cx)]);
if (cx->blk_eval.old_namesv)
PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n",
SvPVX_const(cx->blk_eval.old_namesv));
PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%" UVxf "\n",
PTR2UV(cx->blk_eval.old_eval_root));
PerlIO_printf(Perl_debug_log, "BLK_EVAL.RETOP = 0x%" UVxf "\n",
PTR2UV(cx->blk_eval.retop));
break;
case CXt_LOOP_PLAIN:
case CXt_LOOP_LAZYIV:
case CXt_LOOP_LAZYSV:
case CXt_LOOP_LIST:
case CXt_LOOP_ARY:
PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", CxLABEL(cx));
PerlIO_printf(Perl_debug_log, "BLK_LOOP.MY_OP = 0x%" UVxf "\n",
PTR2UV(cx->blk_loop.my_op));
if (CxTYPE(cx) != CXt_LOOP_PLAIN) {
PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%" UVxf "\n",
PTR2UV(CxITERVAR(cx)));
PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%" UVxf "\n",
PTR2UV(cx->blk_loop.itersave));
}
if (CxTYPE(cx) == CXt_LOOP_ARY) {
PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%" UVxf "\n",
PTR2UV(cx->blk_loop.state_u.ary.ary));
PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n",
(long)cx->blk_loop.state_u.ary.ix);
}
break;
case CXt_SUBST:
PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n",
(long)cx->sb_iters);
PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n",
(long)cx->sb_maxiters);
PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n",
(long)cx->sb_rflags);
PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n",
(long)CxONCE(cx));
PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n",
cx->sb_orig);
PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%" UVxf "\n",
PTR2UV(cx->sb_dstr));
PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%" UVxf "\n",
PTR2UV(cx->sb_targ));
PerlIO_printf(Perl_debug_log, "SB_S = 0x%" UVxf "\n",
PTR2UV(cx->sb_s));
PerlIO_printf(Perl_debug_log, "SB_M = 0x%" UVxf "\n",
PTR2UV(cx->sb_m));
PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%" UVxf "\n",
PTR2UV(cx->sb_strend));
PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%" UVxf "\n",
PTR2UV(cx->sb_rxres));
break;
}
#else
PERL_UNUSED_CONTEXT;
PERL_UNUSED_ARG(cx);
#endif /* DEBUGGING */
}
/*
=for apidoc_section $callback
=for apidoc mortal_destructor_sv
This function arranges for either a Perl code reference, or a C function
reference to be called at the B<end of the current statement>.
The C<coderef> argument determines the type of function that will be
called. If it is C<SvROK()> it is assumed to be a reference to a CV and
will arrange for the coderef to be called. If it is not SvROK() then it
is assumed to be a C<SvIV()> which is C<SvIOK()> whose value is a pointer
to a C function of type C<DESTRUCTORFUNC_t> created using C<PTR2INT()>.
Either way the C<args> parameter will be provided to the callback as a
parameter, although the rules for doing so differ between the Perl and
C mode. Normally this function is only used directly for the Perl case
and the wrapper C<mortal_destructor_x()> is used for the C function case.
When operating in Perl callback mode the C<args> parameter may be NULL
in which case the code reference is called with no arguments, otherwise
if it is an AV (SvTYPE(args) == SVt_PVAV) then the contents of the AV
will be used as the arguments to the code reference, and if it is any
other type then the C<args> SV will be provided as a single argument to
the code reference.
When operating in a C callback mode the C<args> parameter will be passed
directly to the C function as a C<void *> pointer. No additional
processing of the argument will be peformed, and it is the callers
responsibility to free the C<args> parameter if necessary.
Be aware that there is a signficant difference in timing between the
I<end of the current statement> and the I<end of the current pseudo
block>. If you are looking for a mechanism to trigger a function at the
end of the B<current pseudo block> you should look at
L<perlapi/C<SAVEDESTRUCTOR_X>> instead of this function.
=for apidoc mortal_svfunc_x
This function arranges for a C function reference to be called at the
B<end of the current statement> with the arguments provided. It is a
wrapper around C<mortal_destructor_sv()> which ensures that the latter
function is called appropriately.
Be aware that there is a signficant difference in timing between the
I<end of the current statement> and the I<end of the current pseudo
block>. If you are looking for a mechanism to trigger a function at the
end of the B<current pseudo block> you should look at
L<perlapi/C<SAVEDESTRUCTOR_X>> instead of this function.
=for apidoc magic_freedestruct
This function is called via magic to implement the
C<mortal_destructor_sv()> and C<mortal_destructor_x()> functions. It
should not be called directly and has no user servicable parts.
=cut
*/
void
Perl_mortal_destructor_sv(pTHX_ SV *coderef, SV *args) {
PERL_ARGS_ASSERT_MORTAL_DESTRUCTOR_SV;
assert(
(SvROK(coderef) && SvTYPE(SvRV(coderef)) == SVt_PVCV) /* perl coderef */
||
(SvIOK(coderef) && !SvROK(coderef)) /* C function ref */
);
SV *variable = newSV_type_mortal(SVt_IV);
(void)sv_magicext(variable, coderef, PERL_MAGIC_destruct,
&PL_vtbl_destruct, (char *)args, args ? HEf_SVKEY : 0);
}
void
Perl_mortal_svfunc_x(pTHX_ SVFUNC_t f, SV *sv) {
PERL_ARGS_ASSERT_MORTAL_SVFUNC_X;
SV *sviv = newSViv(PTR2IV(f));
mortal_destructor_sv(sviv,sv);
}
int
Perl_magic_freedestruct(pTHX_ SV* sv, MAGIC* mg) {
PERL_ARGS_ASSERT_MAGIC_FREEDESTRUCT;
dSP;
union {
SV *sv;
AV *av;
char *pv;
} args_any;
SV *coderef;
IV nargs = 0;
if (PL_phase == PERL_PHASE_DESTRUCT) {
Perl_warn(aTHX_ "Can't call destructor for 0x%p in global destruction\n", sv);
return 1;
}
args_any.pv = mg->mg_ptr;
coderef = mg->mg_obj;
/* Deal with C function destructor */
if (SvTYPE(coderef) == SVt_IV && !SvROK(coderef)) {
SVFUNC_t f = INT2PTR(SVFUNC_t, SvIV(coderef));
(f)(aTHX_ args_any.sv);
return 0;
}
if (args_any.sv) {
if (SvTYPE(args_any.sv) == SVt_PVAV) {
nargs = av_len(args_any.av) + 1;
} else {
nargs = 1;
}
}
PUSHSTACKi(PERLSI_MAGIC);
ENTER_with_name("call_freedestruct");
SAVETMPS;
EXTEND(SP, nargs);
PUSHMARK(SP);
if (args_any.sv) {
if (SvTYPE(args_any.sv) == SVt_PVAV) {
IV n;
for (n = 0 ; n < nargs ; n++ ) {
SV **argp = av_fetch(args_any.av, n, 0);
if (argp && *argp)
PUSHs(*argp);
}
} else {
PUSHs(args_any.sv);
}
}
PUTBACK;
(void)call_sv(coderef, G_VOID | G_EVAL | G_KEEPERR);
FREETMPS;
LEAVE_with_name("call_freedestruct");
POPSTACK;
return 0;
}
/*
* ex: set ts=8 sts=4 sw=4 et:
*/