forked from schacon/perl
/
scope.c
1408 lines (1255 loc) · 37.9 KB
/
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, SSize_t n)
{
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)
{
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)
{
const IV old_max = cxstack_max;
cxstack_max = GROW(cxstack_max);
Renew(cxstack, cxstack_max + 1, PERL_CONTEXT);
/* 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)
{
if (UNLIKELY(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)
{
const I32 oldsave = PL_scopestack[--PL_scopestack_ix];
LEAVE_SCOPE(oldsave);
}
I32 *
Perl_markstack_grow(pTHX)
{
const I32 oldmax = PL_markstack_max - PL_markstack;
const I32 newmax = GROW(oldmax);
Renew(PL_markstack, newmax, I32);
PL_markstack_max = PL_markstack + newmax;
PL_markstack_ptr = PL_markstack + oldmax;
DEBUG_s(PerlIO_printf(Perl_debug_log, "MARK grow %p %d by %d\n",
PL_markstack_ptr, *PL_markstack_ptr, oldmax));
return PL_markstack_ptr;
}
void
Perl_savestack_grow(pTHX)
{
PL_savestack_max = GROW(PL_savestack_max) + 4;
Renew(PL_savestack, PL_savestack_max, ANY);
}
void
Perl_savestack_grow_cnt(pTHX_ I32 need)
{
PL_savestack_max = PL_savestack_ix + need;
Renew(PL_savestack, PL_savestack_max, ANY);
}
#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
if (ix - PL_tmps_max < 128)
extend_to += (PL_tmps_max < 512) ? 128 : 512;
#endif
PL_tmps_max = extend_to + 1;
Renew(PL_tmps_stack, PL_tmps_max, SV*);
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 && sv != &PL_sv_undef)) {
SvTEMP_off(sv);
SvREFCNT_dec_NN(sv); /* note, can modify tmps_ix!!! */
}
}
}
STATIC SV *
S_save_scalar_at(pTHX_ SV **sptr, const U32 flags)
{
SV * osv;
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)) {
if (SvGMAGICAL(osv)) {
SvFLAGS(osv) |= (SvFLAGS(osv) &
(SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
}
if (!(flags & SAVEf_KEEPOLDELEM))
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 */
}
/* 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)
{
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)
{
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)
{
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)
{
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);
}
void
Perl_save_gp(pTHX_ GV *gv, I32 empty)
{
PERL_ARGS_ASSERT_SAVE_GP;
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 && HvENAME(stash)) {
if (GvNAMELEN(gv) == 3 && strnEQ(GvNAME(gv), "ISA", 3))
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)
{
dSS_ADD;
PERL_ARGS_ASSERT_SAVE_STRLEN;
SS_ADD_IV(*ptr);
SS_ADD_PTR(ptr);
SS_ADD_UV(SAVEt_STRLEN);
SS_ADD_END(3);
}
/* 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);
}
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);
}
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);
}
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");
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);
}
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, 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);
}
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);
save_pushptri32ptr(oldhh, PL_hints, save_cophh, SAVEt_HINTS);
GvHV(PL_hintgv) = NULL; /* in case copying dies */
GvHV(PL_hintgv) = hv_copy_hints_hv(oldhh);
} else {
save_pushi32ptr(PL_hints, save_cophh, SAVEt_HINTS);
}
}
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);
}
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);
}
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 */
}
I32
Perl_save_alloc(pTHX_ I32 size, I32 pad)
{
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 (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;
}
void
Perl_save_aliased_sv(pTHX_ GV *gv)
{
dSS_ADD;
PERL_ARGS_ASSERT_SAVE_ALIASED_SV;
SS_ADD_PTR(gp_ref(GvGP(gv)));
SS_ADD_UV(SAVEt_GP_ALIASED_SV | cBOOL(GvALIASED_SV(gv)) << 8);
SS_ADD_END(2);
}
#define ARG0_SV MUTABLE_SV(arg0.any_ptr)
#define ARG0_AV MUTABLE_AV(arg0.any_ptr)
#define ARG0_HV MUTABLE_HV(arg0.any_ptr)
#define ARG0_PTR arg0.any_ptr
#define ARG0_PV (char*)(arg0.any_ptr)
#define ARG0_PVP (char**)(arg0.any_ptr)
#define ARG0_I32 (arg0.any_i32)
#define ARG1_SV MUTABLE_SV(arg1.any_ptr)
#define ARG1_AV MUTABLE_AV(arg1.any_ptr)
#define ARG1_GV MUTABLE_GV(arg1.any_ptr)
#define ARG1_SVP (SV**)(arg1.any_ptr)
#define ARG1_PVP (char**)(arg1.any_ptr)
#define ARG1_PTR arg1.any_ptr
#define ARG1_PV (char*)(arg1.any_ptr)
#define ARG1_I32 (arg1.any_i32)
#define ARG2_SV MUTABLE_SV(arg2.any_ptr)
#define ARG2_AV MUTABLE_AV(arg2.any_ptr)
#define ARG2_HV MUTABLE_HV(arg2.any_ptr)
#define ARG2_GV MUTABLE_GV(arg2.any_ptr)
#define ARG2_PV (char*)(arg2.any_ptr)
void
Perl_leave_scope(pTHX_ I32 base)
{
/* Localise the effects of the TAINT_NOT inside the loop. */
bool was = TAINT_get;
I32 i;
SV *sv;
ANY arg0, arg1, arg2;
/* these initialisations are logically unnecessary, but they shut up
* spurious 'may be used uninitialized' compiler warnings */
arg0.any_ptr = NULL;
arg1.any_ptr = NULL;
arg2.any_ptr = NULL;
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;
SV *refsv;
SV **svp;
TAINT_NOT;
{
I32 ix = PL_savestack_ix - 1;
ANY *p = &PL_savestack[ix];
uv = p->any_uv;
type = (U8)uv & SAVE_MASK;
if (type > SAVEt_ARG0_MAX) {
ANY *p0 = p;
arg0 = *--p;
if (type > SAVEt_ARG1_MAX) {
arg1 = *--p;
if (type > SAVEt_ARG2_MAX) {
arg2 = *--p;
}
}
ix -= (p0 - p);
}
PL_savestack_ix = ix;
}
switch (type) {
case SAVEt_ITEM: /* normal string */
sv_replace(ARG1_SV, ARG0_SV);
if (UNLIKELY(SvSMAGICAL(ARG1_SV))) {
PL_localizing = 2;
mg_set(ARG1_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 */
svp = ARG1_SVP;
refsv = NULL; /* what to refcnt_dec */
goto restore_sv;
case SAVEt_SV: /* scalar reference */
svp = &GvSV(ARG1_GV);
refsv = ARG1_SV; /* what to refcnt_dec */
restore_sv:
{
SV * const sv = *svp;
*svp = ARG0_SV;
SvREFCNT_dec(sv);
if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
PL_localizing = 2;
mg_set(ARG0_SV);
PL_localizing = 0;
}
SvREFCNT_dec_NN(ARG0_SV);
SvREFCNT_dec(refsv);
break;
}
case SAVEt_GENERIC_PVREF: /* generic pv */
if (*ARG0_PVP != ARG1_PV) {
Safefree(*ARG0_PVP);
*ARG0_PVP = ARG1_PV;
}
break;
case SAVEt_SHARED_PVREF: /* shared pv */
if (*ARG1_PVP != ARG0_PV) {
#ifdef NETWARE
PerlMem_free(*ARG1_PVP);
#else
PerlMemShared_free(*ARG1_PVP);
#endif
*ARG1_PVP = ARG0_PV;
}
break;
case SAVEt_GVSV: /* scalar slot in GV */
svp = &GvSV(ARG1_GV);
goto restore_svp;
case SAVEt_GENERIC_SVREF: /* generic sv */
svp = ARG1_SVP;
restore_svp:
{
SV * const sv = *svp;
*svp = ARG0_SV;
SvREFCNT_dec(sv);
SvREFCNT_dec(ARG0_SV);
break;
}
case SAVEt_GVSLOT: /* any slot in GV */
{
HV *const hv = GvSTASH(ARG2_GV);
svp = ARG1_SVP;
if (hv && HvENAME(hv) && (
(ARG0_SV && SvTYPE(ARG0_SV) == SVt_PVCV)
|| (*svp && SvTYPE(*svp) == SVt_PVCV)
))
{
if ((char *)svp < (char *)GvGP(ARG2_GV)
|| (char *)svp > (char *)GvGP(ARG2_GV) + sizeof(struct gp)
|| GvREFCNT(ARG2_GV) > 2) /* "> 2" to ignore savestack's ref */
PL_sub_generation++;
else mro_method_changed_in(hv);
}
goto restore_svp;
}
case SAVEt_AV: /* array reference */
SvREFCNT_dec(GvAV(ARG1_GV));
GvAV(ARG1_GV) = ARG0_AV;
if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
PL_localizing = 2;
mg_set(ARG0_SV);
PL_localizing = 0;
}
SvREFCNT_dec_NN(ARG1_GV);
break;
case SAVEt_HV: /* hash reference */
SvREFCNT_dec(GvHV(ARG1_GV));
GvHV(ARG1_GV) = ARG0_HV;
if (UNLIKELY(SvSMAGICAL(ARG0_SV))) {
PL_localizing = 2;
mg_set(ARG0_SV);
PL_localizing = 0;
}
SvREFCNT_dec_NN(ARG1_GV);
break;
case SAVEt_INT_SMALL:
*(int*)ARG0_PTR = (int)(uv >> SAVE_TIGHT_SHIFT);
break;
case SAVEt_INT: /* int reference */
*(int*)ARG0_PTR = (int)ARG1_I32;
break;
case SAVEt_STRLEN: /* STRLEN/size_t ref */
*(STRLEN*)ARG0_PTR = (STRLEN)arg1.any_iv;
break;
case SAVEt_BOOL: /* bool reference */
*(bool*)ARG0_PTR = cBOOL(uv >> 8);
#ifdef NO_TAINT_SUPPORT
PERL_UNUSED_VAR(was);
#else
if (UNLIKELY(ARG0_PTR == &(TAINT_get))) {
/* 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*)ARG0_PTR;
}
#endif
break;
case SAVEt_I32_SMALL:
*(I32*)ARG0_PTR = (I32)(uv >> SAVE_TIGHT_SHIFT);
break;
case SAVEt_I32: /* I32 reference */
#ifdef PERL_DEBUG_READONLY_OPS
if (*(I32*)ARG0_PTR != ARG1_I32)
#endif
*(I32*)ARG0_PTR = ARG1_I32;
break;
case SAVEt_SPTR: /* SV* reference */
*(SV**)(ARG0_PTR)= ARG1_SV;
break;
case SAVEt_VPTR: /* random* reference */
case SAVEt_PPTR: /* char* reference */
*ARG0_PVP = ARG1_PV;
break;
case SAVEt_HPTR: /* HV* reference */
*(HV**)ARG0_PTR = MUTABLE_HV(ARG1_PTR);
break;
case SAVEt_APTR: /* AV* reference */
*(AV**)ARG0_PTR = ARG1_AV;
break;
case SAVEt_GP: /* scalar reference */
{
HV *hv;
/* possibly taking a method out of circulation */
const bool had_method = !!GvCVu(ARG1_GV);
gp_free(ARG1_GV);
GvGP_set(ARG1_GV, (GP*)ARG0_PTR);
if ((hv=GvSTASH(ARG1_GV)) && HvENAME_get(hv)) {
if ( GvNAMELEN(ARG1_GV) == 3
&& strnEQ(GvNAME(ARG1_GV), "ISA", 3)
)
mro_isa_changed_in(hv);
else if (had_method || GvCVu(ARG1_GV))
/* putting a method back into circulation ("local")*/
gv_method_changed(ARG1_GV);
}
SvREFCNT_dec_NN(ARG1_GV);
break;
}
case SAVEt_FREESV:
SvREFCNT_dec(ARG0_SV);
break;
case SAVEt_FREEPADNAME:
PadnameREFCNT_dec((PADNAME *)ARG0_PTR);
break;
case SAVEt_FREECOPHH:
cophh_free((COPHH *)ARG0_PTR);
break;
case SAVEt_MORTALIZESV:
sv_2mortal(ARG0_SV);
break;
case SAVEt_FREEOP:
ASSERT_CURPAD_LEGAL("SAVEt_FREEOP");
op_free((OP*)ARG0_PTR);
break;
case SAVEt_FREEPV:
Safefree(ARG0_PTR);
break;
case SAVEt_CLEARPADRANGE:
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];