/*    pad.c
		 *
		 *    Copyright (C) 2002, 2003, 2004, 2005 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.
		 *
		 *  "Anyway: there was this Mr Frodo left an orphan and stranded, as you
		 *  might say, among those queer Bucklanders, being brought up anyhow in
		 *  Brandy Hall. A regular warren, by all accounts. Old Master Gorbadoc
		 *  never had fewer than a couple of hundred relations in the place. Mr
		 *  Bilbo never did a kinder deed than when he brought the lad back to
		 *  live among decent folk." --the Gaffer
		 */
		
		/* XXX DAPM
		 * As of Sept 2002, this file is new and may be in a state of flux for
		 * a while. I've marked things I intent to come back and look at further
		 * with an 'XXX DAPM' comment.
		 */
		
		/*
		=head1 Pad Data Structures
		
		This file contains the functions that create and manipulate scratchpads,
		which are array-of-array data structures attached to a CV (ie a sub)
		and which store lexical variables and opcode temporary and per-thread
		values.
		
		=for apidoc m|AV *|CvPADLIST|CV *cv
		CV's can have CvPADLIST(cv) set to point to an AV.
		
		For these purposes "forms" are a kind-of CV, eval""s are too (except they're
		not callable at will and are always thrown away after the eval"" is done
		executing). Require'd files are simply evals without any outer lexical
		scope.
		
		XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad,
		but that is really the callers pad (a slot of which is allocated by
		every entersub).
		
		The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items
		is managed "manual" (mostly in pad.c) rather than normal av.c rules.
		The items in the AV are not SVs as for a normal AV, but other AVs:
		
		0'th Entry of the CvPADLIST is an AV which represents the "names" or rather
		the "static type information" for lexicals.
		
		The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that
		depth of recursion into the CV.
		The 0'th slot of a frame AV is an AV which is @_.
		other entries are storage for variables and op targets.
		
		During compilation:
		C<PL_comppad_name> is set to the names AV.
		C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1.
		C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)).
		
		During execution, C<PL_comppad> and C<PL_curpad> refer to the live
		frame of the currently executing sub.
		
		Iterating over the names AV iterates over all possible pad
		items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having
		&PL_sv_undef "names" (see pad_alloc()).
		
		Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names.
		The rest are op targets/GVs/constants which are statically allocated
		or resolved at compile time.  These don't have names by which they
		can be looked up from Perl code at run time through eval"" like
		my/our variables can be.  Since they can't be looked up by "name"
		but only by their index allocated at compile time (which is usually
		in PL_op->op_targ), wasting a name SV for them doesn't make sense.
		
		The SVs in the names AV have their PV being the name of the variable.
		NV+1..IV inclusive is a range of cop_seq numbers for which the name is
		valid.  For typed lexicals name SV is SVt_PVMG and SvSTASH points at the
		type.  For C<our> lexicals, the type is SVt_PVGV, and GvSTASH points at the
		stash of the associated global (so that duplicate C<our> delarations in the
		same package can be detected).  SvCUR is sometimes hijacked to
		store the generation number during compilation.
		
		If SvFAKE is set on the name SV, then that slot in the frame AV is
		a REFCNT'ed reference to a lexical from "outside". In this case,
		the name SV does not use NVX and IVX to store a cop_seq range, since it is
		in scope throughout. Instead IVX stores some flags containing info about
		the real lexical (is it declared in an anon, and is it capable of being
		instantiated multiple times?), and for fake ANONs, NVX contains the index
		within the parent's pad where the lexical's value is stored, to make
		cloning quicker.
		
		If the 'name' is '&' the corresponding entry in frame AV
		is a CV representing a possible closure.
		(SvFAKE and name of '&' is not a meaningful combination currently but could
		become so if C<my sub foo {}> is implemented.)
		
		Note that formats are treated as anon subs, and are cloned each time
		write is called (if necessary).
		
		The flag SVf_PADSTALE is cleared on lexicals each time the my() is executed,
		and set on scope exit. This allows the 'Variable $x is not available' warning
		to be generated in evals, such as 
		
		    { my $x = 1; sub f { eval '$x'} } f();
		
		=cut
		*/
		
		
		#include "EXTERN.h"
		#define PERL_IN_PAD_C
		#include "perl.h"
		
		
		#define PAD_MAX 999999999
		
		
		
		/*
		=for apidoc pad_new
		
		Create a new compiling padlist, saving and updating the various global
		vars at the same time as creating the pad itself. The following flags
		can be OR'ed together:
		
		    padnew_CLONE	this pad is for a cloned CV
		    padnew_SAVE		save old globals
		    padnew_SAVESUB	also save extra stuff for start of sub
		
		=cut
		*/
		
		PADLIST *
		Perl_pad_new(pTHX_ int flags)
      527346    {
      527346        AV *padlist, *padname, *pad;
		
      527346        ASSERT_CURPAD_LEGAL("pad_new");
		
		    /* XXX DAPM really need a new SAVEt_PAD which restores all or most
		     * vars (based on flags) rather than storing vals + addresses for
		     * each individually. Also see pad_block_start.
		     * XXX DAPM Try to see whether all these conditionals are required
		     */
		
		    /* save existing state, ... */
		
      527346        if (flags & padnew_SAVE) {
      522846    	SAVECOMPPAD();
      522846    	SAVESPTR(PL_comppad_name);
      522846    	if (! (flags & padnew_CLONE)) {
      507419    	    SAVEI32(PL_padix);
      507419    	    SAVEI32(PL_comppad_name_fill);
      507419    	    SAVEI32(PL_min_intro_pending);
      507419    	    SAVEI32(PL_max_intro_pending);
      507419    	    SAVEI32(PL_cv_has_eval);
      507419    	    if (flags & padnew_SAVESUB) {
      405652    		SAVEI32(PL_pad_reset_pending);
			    }
			}
		    }
		    /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be
		     * saved - check at some pt that this is okay */
		
		    /* ... create new pad ... */
		
      527346        padlist	= newAV();
      527346        padname	= newAV();
      527346        pad		= newAV();
		
      527346        if (flags & padnew_CLONE) {
			/* XXX DAPM  I dont know why cv_clone needs it
			 * doing differently yet - perhaps this separate branch can be
			 * dispensed with eventually ???
			 */
		
       15427            AV * const a0 = newAV();			/* will be @_ */
       15427    	av_extend(a0, 0);
       15427    	av_store(pad, 0, (SV*)a0);
       15427    	AvREIFY_only(a0);
		    }
		    else {
      511919    	av_store(pad, 0, Nullsv);
		    }
		
      527346        AvREAL_off(padlist);
      527346        av_store(padlist, 0, (SV*)padname);
      527346        av_store(padlist, 1, (SV*)pad);
		
		    /* ... then update state variables */
		
      527346        PL_comppad_name	= (AV*)(*av_fetch(padlist, 0, FALSE));
      527346        PL_comppad		= (AV*)(*av_fetch(padlist, 1, FALSE));
      527346        PL_curpad		= AvARRAY(PL_comppad);
		
      527346        if (! (flags & padnew_CLONE)) {
      511919    	PL_comppad_name_fill = 0;
      511919    	PL_min_intro_pending = 0;
      511919    	PL_padix	     = 0;
      511919    	PL_cv_has_eval	     = 0;
		    }
		
		    DEBUG_X(PerlIO_printf(Perl_debug_log,
			  "Pad 0x%"UVxf"[0x%"UVxf"] new:       compcv=0x%"UVxf
			      " name=0x%"UVxf" flags=0x%"UVxf"\n",
			  PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv),
			      PTR2UV(padname), (UV)flags
			)
      527346        );
		
      527346        return (PADLIST*)padlist;
		}
		
		/*
		=for apidoc pad_undef
		
		Free the padlist associated with a CV.
		If parts of it happen to be current, we null the relevant
		PL_*pad* global vars so that we don't have any dangling references left.
		We also repoint the CvOUTSIDE of any about-to-be-orphaned
		inner subs to the outer of this cv.
		
		(This function should really be called pad_free, but the name was already
		taken)
		
		=cut
		*/
		
		void
		Perl_pad_undef(pTHX_ CV* cv)
      803172    {
      803172        I32 ix;
      803172        const PADLIST *padlist = CvPADLIST(cv);
		
      803172        if (!padlist)
      272564    	return;
      530608        if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */
       42565    	return;
		
		    DEBUG_X(PerlIO_printf(Perl_debug_log,
			  "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n",
			    PTR2UV(cv), PTR2UV(padlist))
      488043        );
		
		    /* detach any '&' anon children in the pad; if afterwards they
		     * are still live, fix up their CvOUTSIDEs to point to our outside,
		     * bypassing us. */
		    /* XXX DAPM for efficiency, we should only do this if we know we have
		     * children, or integrate this loop with general cleanup */
		
      488043        if (!PL_dirty) { /* don't bother during global destruction */
      214732    	CV * const outercv = CvOUTSIDE(cv);
      214732            const U32 seq = CvOUTSIDE_SEQ(cv);
      214732    	AV *  const comppad_name = (AV*)AvARRAY(padlist)[0];
      214732    	SV ** const namepad = AvARRAY(comppad_name);
      214732    	AV *  const comppad = (AV*)AvARRAY(padlist)[1];
      214732    	SV ** const curpad = AvARRAY(comppad);
      490966    	for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
      276234    	    SV * const namesv = namepad[ix];
      276234    	    if (namesv && namesv != &PL_sv_undef
				&& *SvPVX_const(namesv) == '&')
			    {
        2526    		CV * const innercv = (CV*)curpad[ix];
        2526    		U32 inner_rc = SvREFCNT(innercv);
        2526    		assert(inner_rc);
        2526    		namepad[ix] = Nullsv;
        2526    		SvREFCNT_dec(namesv);
		
        2526    		if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/  */
        2526    		    curpad[ix] = Nullsv;
        2526    		    SvREFCNT_dec(innercv);
        2526    		    inner_rc--;
				}
        2526    		if (inner_rc /* in use, not just a prototype */
				    && CvOUTSIDE(innercv) == cv)
				{
        1511    		    assert(CvWEAKOUTSIDE(innercv));
				    /* don't relink to grandfather if he's being freed */
        1511    		    if (outercv && SvREFCNT(outercv)) {
        1488    			CvWEAKOUTSIDE_off(innercv);
        1488    			CvOUTSIDE(innercv) = outercv;
        1488    			CvOUTSIDE_SEQ(innercv) = seq;
        1488    			(void)SvREFCNT_inc(outercv);
				    }
				    else {
          23    			CvOUTSIDE(innercv) = Nullcv;
				    }
		
				}
		
			    }
			}
		    }
		
      488043        ix = AvFILLp(padlist);
     1533542        while (ix >= 0) {
     1045499    	SV* const sv = AvARRAY(padlist)[ix--];
     1045499    	if (!sv)
      ######    	    continue;
     1045499    	if (sv == (SV*)PL_comppad_name)
      119997    	    PL_comppad_name = Nullav;
      925502    	else if (sv == (SV*)PL_comppad) {
      120047    	    PL_comppad = Null(PAD*);
      120047    	    PL_curpad = Null(SV**);
			}
     1045499    	SvREFCNT_dec(sv);
		    }
      488043        SvREFCNT_dec((SV*)CvPADLIST(cv));
      488043        CvPADLIST(cv) = Null(PADLIST*);
		}
		
		
		
		
		/*
		=for apidoc pad_add_name
		
		Create a new name and associated PADMY SV in the current pad; return the
		offset.
		If C<typestash> is valid, the name is for a typed lexical; set the
		name's stash to that value.
		If C<ourstash> is valid, it's an our lexical, set the name's
		GvSTASH to that value
		
		If fake, it means we're cloning an existing entry
		
		=cut
		*/
		
		PADOFFSET
		Perl_pad_add_name(pTHX_ const char *name, HV* typestash, HV* ourstash, bool fake)
     1048830    {
     1048830        const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY);
     1048830        SV* const namesv = NEWSV(1102, 0);
		
     1048830        ASSERT_CURPAD_ACTIVE("pad_add_name");
		
		
     1048830        sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV);
     1048830        sv_setpv(namesv, name);
		
     1048830        if (typestash) {
          30    	SvFLAGS(namesv) |= SVpad_TYPED;
          30    	SvSTASH_set(namesv, (HV*)SvREFCNT_inc((SV*) typestash));
		    }
     1048830        if (ourstash) {
      130186    	SvFLAGS(namesv) |= SVpad_OUR;
      130186    	GvSTASH(namesv) = ourstash;
      130186    	Perl_sv_add_backref(aTHX_ (SV*)ourstash, namesv);
		    }
		
     1048830        av_store(PL_comppad_name, offset, namesv);
     1048830        if (fake) {
      199175    	SvFAKE_on(namesv);
			DEBUG_Xv(PerlIO_printf(Perl_debug_log,
      199175    	    "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name));
		    }
		    else {
			/* not yet introduced */
      849655    	SvNV_set(namesv, (NV)PAD_MAX);	/* min */
      849655    	SvIV_set(namesv, 0);		/* max */
		
      849655    	if (!PL_min_intro_pending)
      640387    	    PL_min_intro_pending = offset;
      849655    	PL_max_intro_pending = offset;
			/* if it's not a simple scalar, replace with an AV or HV */
			/* XXX DAPM since slot has been allocated, replace
			 * av_store with PL_curpad[offset] ? */
      849655    	if (*name == '@')
       72607    	    av_store(PL_comppad, offset, (SV*)newAV());
      777048    	else if (*name == '%')
       38516    	    av_store(PL_comppad, offset, (SV*)newHV());
      849655    	SvPADMY_on(PL_curpad[offset]);
			DEBUG_Xv(PerlIO_printf(Perl_debug_log,
			    "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n",
      849655    	    (long)offset, name, PTR2UV(PL_curpad[offset])));
		    }
		
     1048830        return offset;
		}
		
		
		
		
		/*
		=for apidoc pad_alloc
		
		Allocate a new my or tmp pad entry. For a my, simply push a null SV onto
		the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards
		for a slot which has no name and and no active value.
		
		=cut
		*/
		
		/* XXX DAPM integrate alloc(), add_name() and add_anon(),
		 * or at least rationalise ??? */
		
		
		PADOFFSET
		Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
     5011833    {
     5011833        SV *sv;
     5011833        I32 retval;
		
     5011833        ASSERT_CURPAD_ACTIVE("pad_alloc");
		
     5011833        if (AvARRAY(PL_comppad) != PL_curpad)
      ######    	Perl_croak(aTHX_ "panic: pad_alloc");
     5011833        if (PL_pad_reset_pending)
     1172390    	pad_reset();
     5011833        if (tmptype & SVs_PADMY) {
     1095769    	sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
     1095769    	retval = AvFILLp(PL_comppad);
		    }
		    else {
     3916064    	SV ** const names = AvARRAY(PL_comppad_name);
     3916064            const SSize_t names_fill = AvFILLp(PL_comppad_name);
     8915728    	for (;;) {
			    /*
			     * "foreach" index vars temporarily become aliases to non-"my"
			     * values.  Thus we must skip, not just pad values that are
			     * marked as current pad values, but also those with names.
			     */
			    /* HVDS why copy to sv here? we don't seem to use it */
     4999664    	    if (++PL_padix <= names_fill &&
				   (sv = names[PL_padix]) && sv != &PL_sv_undef)
      996272    		continue;
     4003392    	    sv = *av_fetch(PL_comppad, PL_padix, TRUE);
     4003392    	    if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) &&
				!IS_PADGV(sv) && !IS_PADCONST(sv))
     3916064    		break;
			}
     3916064    	retval = PL_padix;
		    }
     5011833        SvFLAGS(sv) |= tmptype;
     5011833        PL_curpad = AvARRAY(PL_comppad);
		
		    DEBUG_X(PerlIO_printf(Perl_debug_log,
			  "Pad 0x%"UVxf"[0x%"UVxf"] alloc:   %ld for %s\n",
			  PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval,
     5011833    	  PL_op_name[optype]));
		#ifdef DEBUG_LEAKING_SCALARS
		    sv->sv_debug_optype = optype;
		    sv->sv_debug_inpad = 1;
		#endif
     5011833        return (PADOFFSET)retval;
		}
		
		/*
		=for apidoc pad_add_anon
		
		Add an anon code entry to the current compiling pad
		
		=cut
		*/
		
		PADOFFSET
		Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type)
       18877    {
       18877        PADOFFSET ix;
       18877        SV* name;
		
       18877        name = NEWSV(1106, 0);
       18877        sv_upgrade(name, SVt_PVNV);
       18877        sv_setpvn(name, "&", 1);
       18877        SvIV_set(name, -1);
       18877        SvNV_set(name, 1);
       18877        ix = pad_alloc(op_type, SVs_PADMY);
       18877        av_store(PL_comppad_name, ix, name);
		    /* XXX DAPM use PL_curpad[] ? */
       18877        av_store(PL_comppad, ix, sv);
       18877        SvPADMY_on(sv);
		
		    /* to avoid ref loops, we never have parent + child referencing each
		     * other simultaneously */
       18877        if (CvOUTSIDE((CV*)sv)) {
       18843    	assert(!CvWEAKOUTSIDE((CV*)sv));
       18843    	CvWEAKOUTSIDE_on((CV*)sv);
       18843    	SvREFCNT_dec(CvOUTSIDE((CV*)sv));
		    }
       18877        return ix;
		}
		
		
		
		/*
		=for apidoc pad_check_dup
		
		Check for duplicate declarations: report any of:
		     * a my in the current scope with the same name;
		     * an our (anywhere in the pad) with the same name and the same stash
		       as C<ourstash>
		C<is_our> indicates that the name to check is an 'our' declaration
		
		=cut
		*/
		
		/* XXX DAPM integrate this into pad_add_name ??? */
		
		void
		Perl_pad_check_dup(pTHX_ const char *name, bool is_our, const HV *ourstash)
      849655    {
      849655        SV		**svp;
      849655        PADOFFSET	top, off;
		
      849655        ASSERT_CURPAD_ACTIVE("pad_check_dup");
      849655        if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0)
      263158    	return; /* nothing to check */
		
      263158        svp = AvARRAY(PL_comppad_name);
      263158        top = AvFILLp(PL_comppad_name);
		    /* check the current scope */
		    /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same
		     * type ? */
     2854513        for (off = top; (I32)off > PL_comppad_name_floor; off--) {
     2591362    	SV * const sv = svp[off];
     2591362    	if (sv
			    && sv != &PL_sv_undef
			    && !SvFAKE(sv)
			    && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
			    && (!is_our
				|| ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash))
			    && strEQ(name, SvPVX_const(sv)))
			{
           7    	    Perl_warner(aTHX_ packWARN(WARN_MISC),
				"\"%s\" variable %s masks earlier declaration in same %s",
				(is_our ? "our" : "my"),
				name,
				(SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
           7    	    --off;
           7    	    break;
			}
		    }
		    /* check the rest of the pad */
      263158        if (is_our) {
       21423    	do {
       21423    	    SV * const sv = svp[off];
       21423    	    if (sv
				&& sv != &PL_sv_undef
				&& !SvFAKE(sv)
				&& (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
				&& ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)
				&& strEQ(name, SvPVX_const(sv)))
			    {
           2    		Perl_warner(aTHX_ packWARN(WARN_MISC),
				    "\"our\" variable %s redeclared", name);
           2    		Perl_warner(aTHX_ packWARN(WARN_MISC),
				    "\t(Did you mean \"local\" instead of \"our\"?)\n");
           2    		break;
			    }
       21421    	} while ( off-- > 0 );
		    }
		}
		
		
		/*
		=for apidoc pad_findmy
		
		Given a lexical name, try to find its offset, first in the current pad,
		or failing that, in the pads of any lexically enclosing subs (including
		the complications introduced by eval). If the name is found in an outer pad,
		then a fake entry is added to the current pad.
		Returns the offset in the current pad, or NOT_IN_PAD on failure.
		
		=cut
		*/
		
		PADOFFSET
		Perl_pad_findmy(pTHX_ const char *name)
     4491711    {
     4491711        SV *out_sv;
     4491711        int out_flags;
     4491711        I32 offset;
     4491711        const AV *nameav;
     4491711        SV **name_svp;
		
     4491711        offset =  pad_findlex(name, PL_compcv, PL_cop_seqmax, 1,
				Null(SV**), &out_sv, &out_flags);
     4491711        if (offset != NOT_IN_PAD) 
     3167678    	return offset;
		
		    /* look for an our that's being introduced; this allows
		     *    our $foo = 0 unless defined $foo;
		     * to not give a warning. (Yes, this is a hack) */
		
     1324033        nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0];
     1324033        name_svp = AvARRAY(nameav);
    38436929        for (offset = AvFILLp(nameav); offset > 0; offset--) {
    37112899            const SV *namesv = name_svp[offset];
    37112899    	if (namesv && namesv != &PL_sv_undef
			    && !SvFAKE(namesv)
			    && (SvFLAGS(namesv) & SVpad_OUR)
			    && strEQ(SvPVX_const(namesv), name)
			    && U_32(SvNVX(namesv)) == PAD_MAX /* min */
			)
           3    	    return offset;
		    }
     1324030        return NOT_IN_PAD;
		}
		
		/*
		 * Returns the offset of a lexical $_, if there is one, at run time.
		 * Used by the UNDERBAR XS macro.
		 */
		
		PADOFFSET
		Perl_find_rundefsvoffset(pTHX)
           5    {
           5        SV *out_sv;
           5        int out_flags;
           5        return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1,
			    Null(SV**), &out_sv, &out_flags);
		}
		
		/*
		=for apidoc pad_findlex
		
		Find a named lexical anywhere in a chain of nested pads. Add fake entries
		in the inner pads if it's found in an outer one.
		
		Returns the offset in the bottom pad of the lex or the fake lex.
		cv is the CV in which to start the search, and seq is the current cop_seq
		to match against. If warn is true, print appropriate warnings.  The out_*
		vars return values, and so are pointers to where the returned values
		should be stored. out_capture, if non-null, requests that the innermost
		instance of the lexical is captured; out_name_sv is set to the innermost
		matched namesv or fake namesv; out_flags returns the flags normally
		associated with the IVX field of a fake namesv.
		
		Note that pad_findlex() is recursive; it recurses up the chain of CVs,
		then comes back down, adding fake entries as it goes. It has to be this way
		because fake namesvs in anon protoypes have to store in NVX the index into
		the parent pad.
		
		=cut
		*/
		
		/* Flags set in the SvIVX field of FAKE namesvs */
		
		#define PAD_FAKELEX_ANON   1 /* the lex is declared in an ANON, or ... */
		#define PAD_FAKELEX_MULTI  2 /* the lex can be instantiated multiple times */
		
		/* the CV has finished being compiled. This is not a sufficient test for
		 * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */
		#define CvCOMPILED(cv)	CvROOT(cv)
		
		/* the CV does late binding of its lexicals */
		#define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM)
		
		
		STATIC PADOFFSET
		S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn,
			SV** out_capture, SV** out_name_sv, int *out_flags)
     5921490    {
     5921490        I32 offset, new_offset;
     5921490        SV *new_capture;
     5921490        SV **new_capturep;
     5921490        const AV *padlist = CvPADLIST(cv);
		
     5921490        *out_flags = 0;
		
		    DEBUG_Xv(PerlIO_printf(Perl_debug_log,
			"Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n",
     5921490    	PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" ));
		
		    /* first, search this pad */
		
     5921490        if (padlist) { /* not an undef CV */
     5921489    	I32 fake_offset = 0;
     5921489            const AV *nameav = (AV*)AvARRAY(padlist)[0];
     5921489    	SV **name_svp = AvARRAY(nameav);
		
   154116807    	for (offset = AvFILLp(nameav); offset > 0; offset--) {
   151224450                const SV *namesv = name_svp[offset];
   151224450    	    if (namesv && namesv != &PL_sv_undef
				    && strEQ(SvPVX_const(namesv), name))
			    {
     3192797    		if (SvFAKE(namesv))
      138549    		    fake_offset = offset; /* in case we don't find a real one */
     3054248    		else if (  seq >  U_32(SvNVX(namesv))	/* min */
					&& seq <= (U32)SvIVX(namesv))	/* max */
     3029132    		    break;
			    }
			}
		
     5921489    	if (offset > 0 || fake_offset > 0 ) { /* a match! */
     3167681    	    if (offset > 0) { /* not fake */
     3029132    		fake_offset = 0;
     3029132    		*out_name_sv = name_svp[offset]; /* return the namesv */
		
				/* set PAD_FAKELEX_MULTI if this lex can have multiple
				 * instances. For now, we just test !CvUNIQUE(cv), but
				 * ideally, we should detect my's declared within loops
				 * etc - this would allow a wider range of 'not stayed
				 * shared' warnings. We also treated alreadly-compiled
				 * lexes as not multi as viewed from evals. */
		
     3029132    		*out_flags = CvANON(cv) ?
					PAD_FAKELEX_ANON :
					    (!CvUNIQUE(cv) && ! CvCOMPILED(cv))
						? PAD_FAKELEX_MULTI : 0;
		
				DEBUG_Xv(PerlIO_printf(Perl_debug_log,
				    "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n",
				    PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)),
     3029132    		    (long)SvIVX(*out_name_sv)));
			    }
			    else { /* fake match */
      138549    		offset = fake_offset;
      138549    		*out_name_sv = name_svp[offset]; /* return the namesv */
      138549    		*out_flags = SvIVX(*out_name_sv);
				DEBUG_Xv(PerlIO_printf(Perl_debug_log,
				    "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n",
				    PTR2UV(cv), (long)offset, (unsigned long)*out_flags,
					(unsigned long)SvNVX(*out_name_sv) 
      138549    		));
			    }
		
			    /* return the lex? */
		
     3167681    	    if (out_capture) {
		
				/* our ? */
      191381    		if ((SvFLAGS(*out_name_sv) & SVpad_OUR)) {
       61291    		    *out_capture = Nullsv;
       61291    		    return offset;
				}
		
				/* trying to capture from an anon prototype? */
      130090    		if (CvCOMPILED(cv)
					? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv)
					: *out_flags & PAD_FAKELEX_ANON)
				{
          15    		    if (warn && ckWARN(WARN_CLOSURE))
          15    			Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
					    "Variable \"%s\" is not available", name);
          15    		    *out_capture = Nullsv;
				}
		
				/* real value */
				else {
      130075    		    int newwarn = warn;
      130075    		    if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI)
					 && warn && ckWARN(WARN_CLOSURE)) {
          16    			newwarn = 0;
          16    			Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
					    "Variable \"%s\" will not stay shared", name);
				    }
		
      130075    		    if (fake_offset && CvANON(cv)
					    && CvCLONE(cv) &&!CvCLONED(cv))
				    {
           2    			SV *n;
					/* not yet caught - look further up */
					DEBUG_Xv(PerlIO_printf(Perl_debug_log,
					    "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n",
           2    			    PTR2UV(cv)));
           2    			n = *out_name_sv;
           2    			pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv),
					    newwarn, out_capture, out_name_sv, out_flags);
           2    			*out_name_sv = n;
           2    			return offset;
				    }
		
      130073    		    *out_capture = AvARRAY((AV*)AvARRAY(padlist)[
						    CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset];
				    DEBUG_Xv(PerlIO_printf(Perl_debug_log,
					"Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n",
      130073    			PTR2UV(cv), PTR2UV(*out_capture)));
		
      130073    		    if (SvPADSTALE(*out_capture)) {
           3    			if (ckWARN(WARN_CLOSURE))
           3    			    Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
						"Variable \"%s\" is not available", name);
           3    			*out_capture = Nullsv;
				    }
				}
      130088    		if (!*out_capture) {
          18    		    if (*name == '@')
           4    			*out_capture = sv_2mortal((SV*)newAV());
          14    		    else if (*name == '%')
           4    			*out_capture = sv_2mortal((SV*)newHV());
				    else
          10    			*out_capture = sv_newmortal();
				}
			    }
		
     3106388    	    return offset;
			}
		    }
		
		    /* it's not in this pad - try above */
		
     2753809        if (!CvOUTSIDE(cv))
     1324037    	return NOT_IN_PAD;
		    
		    /* out_capture non-null means caller wants us to capture lex; in
		     * addition we capture ourselves unless it's an ANON/format */
     1429772        new_capturep = out_capture ? out_capture :
				CvLATE(cv) ? Null(SV**) : &new_capture;
		
     1429772        offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1,
				new_capturep, out_name_sv, out_flags);
     1429772        if (offset == NOT_IN_PAD)
     1230460    	return NOT_IN_PAD;
		    
		    /* found in an outer CV. Add appropriate fake entry to this pad */
		
		    /* don't add new fake entries (via eval) to CVs that we have already
		     * finished compiling, or to undef CVs */
      199312        if (CvCOMPILED(cv) || !padlist)
         137    	return 0; /* this dummy (and invalid) value isnt used by the caller */
		
		    {
      199175    	SV *new_namesv;
      199175    	AV *  const ocomppad_name = PL_comppad_name;
      199175    	PAD * const ocomppad = PL_comppad;
      199175    	PL_comppad_name = (AV*)AvARRAY(padlist)[0];
      199175    	PL_comppad = (AV*)AvARRAY(padlist)[1];
      199175    	PL_curpad = AvARRAY(PL_comppad);
		
      199175    	new_offset = pad_add_name(
			    SvPVX_const(*out_name_sv),
			    (SvFLAGS(*out_name_sv) & SVpad_TYPED)
				    ? SvSTASH(*out_name_sv) : Nullhv,
			    (SvFLAGS(*out_name_sv) & SVpad_OUR)
				    ? GvSTASH(*out_name_sv) : Nullhv,
			    1  /* fake */
			);
		
      199175    	new_namesv = AvARRAY(PL_comppad_name)[new_offset];
      199175    	SvIV_set(new_namesv, *out_flags);
		
      199175    	SvNV_set(new_namesv, (NV)0);
      199175    	if (SvFLAGS(new_namesv) & SVpad_OUR) {
			   /* do nothing */
			}
      137810    	else if (CvLATE(cv)) {
			    /* delayed creation - just note the offset within parent pad */
        7076    	    SvNV_set(new_namesv, (NV)offset);
        7076    	    CvCLONE_on(cv);
			}
			else {
			    /* immediate creation - capture outer value right now */
      130734    	    av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep));
			    DEBUG_Xv(PerlIO_printf(Perl_debug_log,
				"Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n",
      130734    		PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset));
			}
      199175    	*out_name_sv = new_namesv;
      199175    	*out_flags = SvIVX(new_namesv);
		
      199175    	PL_comppad_name = ocomppad_name;
      199175    	PL_comppad = ocomppad;
      199175    	PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **);
		    }
      199175        return new_offset;
		}
		
				
		/*
		=for apidoc pad_sv
		
		Get the value at offset po in the current pad.
		Use macro PAD_SV instead of calling this function directly.
		
		=cut
		*/
		
		
		SV *
		Perl_pad_sv(pTHX_ PADOFFSET po)
   283162255    {
   283162255        ASSERT_CURPAD_ACTIVE("pad_sv");
		
   283162255        if (!po)
      ######    	Perl_croak(aTHX_ "panic: pad_sv po");
		    DEBUG_X(PerlIO_printf(Perl_debug_log,
			"Pad 0x%"UVxf"[0x%"UVxf"] sv:      %ld sv=0x%"UVxf"\n",
			PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po]))
   283162255        );
   283162255        return PL_curpad[po];
		}
		
		
		/*
		=for apidoc pad_setsv
		
		Set the entry at offset po in the current pad to sv.
		Use the macro PAD_SETSV() rather than calling this function directly.
		
		=cut
		*/
		
		#ifdef DEBUGGING
		void
		Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv)
      ######    {
      ######        ASSERT_CURPAD_ACTIVE("pad_setsv");
		
		    DEBUG_X(PerlIO_printf(Perl_debug_log,
			"Pad 0x%"UVxf"[0x%"UVxf"] setsv:   %ld sv=0x%"UVxf"\n",
			PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv))
      ######        );
      ######        PL_curpad[po] = sv;
		}
		#endif
		
		
		
		/*
		=for apidoc pad_block_start
		
		Update the pad compilation state variables on entry to a new block
		
		=cut
		*/
		
		/* XXX DAPM perhaps:
		 * 	- integrate this in general state-saving routine ???
		 * 	- combine with the state-saving going on in pad_new ???
		 * 	- introduce a new SAVE type that does all this in one go ?
		 */
		
		void
		Perl_pad_block_start(pTHX_ int full)
     1456170    {
     1456170        ASSERT_CURPAD_ACTIVE("pad_block_start");
     1456170        SAVEI32(PL_comppad_name_floor);
     1456170        PL_comppad_name_floor = AvFILLp(PL_comppad_name);
     1456170        if (full)
      919170    	PL_comppad_name_fill = PL_comppad_name_floor;
     1456170        if (PL_comppad_name_floor < 0)
      440092    	PL_comppad_name_floor = 0;
     1456170        SAVEI32(PL_min_intro_pending);
     1456170        SAVEI32(PL_max_intro_pending);
     1456170        PL_min_intro_pending = 0;
     1456170        SAVEI32(PL_comppad_name_fill);
     1456170        SAVEI32(PL_padix_floor);
     1456170        PL_padix_floor = PL_padix;
     1456170        PL_pad_reset_pending = FALSE;
		}
		
		
		/*
		=for apidoc intro_my
		
		"Introduce" my variables to visible status.
		
		=cut
		*/
		
		U32
		Perl_intro_my(pTHX)
     3656323    {
     3656323        SV **svp;
     3656323        I32 i;
		
     3656323        ASSERT_CURPAD_ACTIVE("intro_my");
     3656323        if (! PL_min_intro_pending)
     3015941    	return PL_cop_seqmax;
		
      640382        svp = AvARRAY(PL_comppad_name);
     1497506        for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
      857124    	SV * const sv = svp[i];
		
      857124    	if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !SvIVX(sv)) {
      849650    	    SvIV_set(sv, PAD_MAX);	/* Don't know scope end yet. */
      849650    	    SvNV_set(sv, (NV)PL_cop_seqmax);
			    DEBUG_Xv(PerlIO_printf(Perl_debug_log,
				"Pad intromy: %ld \"%s\", (%ld,%ld)\n",
				(long)i, SvPVX_const(sv),
				(long)U_32(SvNVX(sv)), (long)SvIVX(sv))
      849650    	    );
			}
		    }
      640382        PL_min_intro_pending = 0;
      640382        PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
		    DEBUG_Xv(PerlIO_printf(Perl_debug_log,
      640382    		"Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1)));
		
      640382        return PL_cop_seqmax++;
		}
		
		/*
		=for apidoc pad_leavemy
		
		Cleanup at end of scope during compilation: set the max seq number for
		lexicals in this scope and warn of any lexicals that never got introduced.
		
		=cut
		*/
		
		void
		Perl_pad_leavemy(pTHX)
     1455353    {
     1455353        I32 off;
     1455353        SV ** const svp = AvARRAY(PL_comppad_name);
		
     1455353        PL_pad_reset_pending = FALSE;
		
     1455353        ASSERT_CURPAD_ACTIVE("pad_leavemy");
     1455353        if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) {
      ######    	for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
      ######    	    const SV * const sv = svp[off];
      ######    	    if (sv && sv != &PL_sv_undef
				    && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL))
      ######    		Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
							"%"SVf" never introduced", sv);
			}
		    }
		    /* "Deintroduce" my variables that are leaving with this scope. */
     9050192        for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) {
     7594839    	const SV * const sv = svp[off];
     7594839    	if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) {
      849339    	    SvIV_set(sv, PL_cop_seqmax);
			    DEBUG_Xv(PerlIO_printf(Perl_debug_log,
				"Pad leavemy: %ld \"%s\", (%ld,%ld)\n",
				(long)off, SvPVX_const(sv),
				(long)U_32(SvNVX(sv)), (long)SvIVX(sv))
      849339    	    );
			}
		    }
     1455353        PL_cop_seqmax++;
		    DEBUG_Xv(PerlIO_printf(Perl_debug_log,
     1455353    	    "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax));
		}
		
		
		/*
		=for apidoc pad_swipe
		
		Abandon the tmp in the current pad at offset po and replace with a
		new one.
		
		=cut
		*/
		
		void
		Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust)
      319881    {
      319881        ASSERT_CURPAD_LEGAL("pad_swipe");
      319881        if (!PL_curpad)
      ######    	return;
      319881        if (AvARRAY(PL_comppad) != PL_curpad)
      ######    	Perl_croak(aTHX_ "panic: pad_swipe curpad");
      319881        if (!po)
      ######    	Perl_croak(aTHX_ "panic: pad_swipe po");
		
		    DEBUG_X(PerlIO_printf(Perl_debug_log,
				"Pad 0x%"UVxf"[0x%"UVxf"] swipe:   %ld\n",
      319881    		PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po));
		
      319881        if (PL_curpad[po])
      319881    	SvPADTMP_off(PL_curpad[po]);
      319881        if (refadjust)
      ######    	SvREFCNT_dec(PL_curpad[po]);
		
		
		    /* if pad tmps aren't shared between ops, then there's no need to
		     * create a new tmp when an existing op is freed */
		#ifdef USE_BROKEN_PAD_RESET
		    PL_curpad[po] = NEWSV(1107,0);
		    SvPADTMP_on(PL_curpad[po]);
		#else
      319881        PL_curpad[po] = &PL_sv_undef;
		#endif
      319881        if ((I32)po < PL_padix)
      ######    	PL_padix = po - 1;
		}
		
		
		/*
		=for apidoc pad_reset
		
		Mark all the current temporaries for reuse
		
		=cut
		*/
		
		/* XXX pad_reset() is currently disabled because it results in serious bugs.
		 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
		 * on the stack by OPs that use them, there are several ways to get an alias
		 * to  a shared TARG.  Such an alias will change randomly and unpredictably.
		 * We avoid doing this until we can think of a Better Way.
		 * GSAR 97-10-29 */
		void
		Perl_pad_reset(pTHX)
     1172390    {
		#ifdef USE_BROKEN_PAD_RESET
		    if (AvARRAY(PL_comppad) != PL_curpad)
			Perl_croak(aTHX_ "panic: pad_reset curpad");
		
		    DEBUG_X(PerlIO_printf(Perl_debug_log,
			    "Pad 0x%"UVxf"[0x%"UVxf"] reset:     padix %ld -> %ld",
			    PTR2UV(PL_comppad), PTR2UV(PL_curpad),
				(long)PL_padix, (long)PL_padix_floor
			    )
		    );
		
		    if (!PL_tainting) {	/* Can't mix tainted and non-tainted temporaries. */
		        register I32 po;
			for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
			    if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
				SvPADTMP_off(PL_curpad[po]);
			}
			PL_padix = PL_padix_floor;
		    }
		#endif
     1172390        PL_pad_reset_pending = FALSE;
		}
		
		
		/*
		=for apidoc pad_tidy
		
		Tidy up a pad after we've finished compiling it:
		    * remove most stuff from the pads of anonsub prototypes;
		    * give it a @_;
		    * mark tmps as such.
		
		=cut
		*/
		
		/* XXX DAPM surely most of this stuff should be done properly
		 * at the right time beforehand, rather than going around afterwards
		 * cleaning up our mistakes ???
		 */
		
		void
		Perl_pad_tidy(pTHX_ padtidy_type type)
      347552    {
		    dVAR;
		
      347552        ASSERT_CURPAD_ACTIVE("pad_tidy");
		
		    /* If this CV has had any 'eval-capable' ops planted in it
		     * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any
		     * anon prototypes in the chain of CVs should be marked as cloneable,
		     * so that for example the eval's CV in C<< sub { eval '$x' } >> gets
		     * the right CvOUTSIDE.
		     * If running with -d, *any* sub may potentially have an eval
		     * excuted within it.
		     */
		
      347552        if (PL_cv_has_eval || PL_perldb) {
       16240            const CV *cv;
       49110    	for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) {
       33221    	    if (cv != PL_compcv && CvCOMPILED(cv))
         351    		break; /* no need to mark already-compiled code */
       32870    	    if (CvANON(cv)) {
				DEBUG_Xv(PerlIO_printf(Perl_debug_log,
         687    		    "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv)));
         687    		CvCLONE_on(cv);
			    }
			}
		    }
		
		    /* extend curpad to match namepad */
      347552        if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad))
      340324    	av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv);
		
      347552        if (type == padtidy_SUBCLONE) {
        5016    	SV ** const namep = AvARRAY(PL_comppad_name);
        5016    	PADOFFSET ix;
		
       47350    	for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
       42334    	    SV *namesv;
		
       42334    	    if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix]))
       40897    		continue;
			    /*
			     * The only things that a clonable function needs in its
			     * pad are anonymous subs.
			     * The rest are created anew during cloning.
			     */
       40897    	    if (!((namesv = namep[ix]) != Nullsv &&
				  namesv != &PL_sv_undef &&
				   *SvPVX_const(namesv) == '&'))
			    {
       40818    		SvREFCNT_dec(PL_curpad[ix]);
       40818    		PL_curpad[ix] = Nullsv;
			    }
			}
		    }
      342536        else if (type == padtidy_SUB) {
			/* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */
      342448    	AV * const av = newAV();			/* Will be @_ */
      342448    	av_extend(av, 0);
      342448    	av_store(PL_comppad, 0, (SV*)av);
      342448    	AvREIFY_only(av);
		    }
		
		    /* XXX DAPM rationalise these two similar branches */
		
      347552        if (type == padtidy_SUB) {
      342448    	PADOFFSET ix;
     4471549    	for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
     4129101    	    if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix]))
     4056783    		continue;
     4056783    	    if (!SvPADMY(PL_curpad[ix]))
     3172096    		SvPADTMP_on(PL_curpad[ix]);
			}
		    }
        5104        else if (type == padtidy_FORMAT) {
          88    	PADOFFSET ix;
         175    	for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
          87    	    if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix]))
          52    		SvPADTMP_on(PL_curpad[ix]);
			}
		    }
      347552        PL_curpad = AvARRAY(PL_comppad);
		}
		
		
		/*
		=for apidoc pad_free
		
		Free the SV at offet po in the current pad.
		
		=cut
		*/
		
		/* XXX DAPM integrate with pad_swipe ???? */
		void
		Perl_pad_free(pTHX_ PADOFFSET po)
     7762006    {
     7762006        ASSERT_CURPAD_LEGAL("pad_free");
     7762006        if (!PL_curpad)
     6571445    	return;
     1190561        if (AvARRAY(PL_comppad) != PL_curpad)
      ######    	Perl_croak(aTHX_ "panic: pad_free curpad");
     1190561        if (!po)
      ######    	Perl_croak(aTHX_ "panic: pad_free po");
		
		    DEBUG_X(PerlIO_printf(Perl_debug_log,
			    "Pad 0x%"UVxf"[0x%"UVxf"] free:    %ld\n",
			    PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)
     1190561        );
		
     1190561        if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) {
      870680    	SvPADTMP_off(PL_curpad[po]);
		#ifdef USE_ITHREADS
			/* SV could be a shared hash key (eg bugid #19022) */
			if (
		#ifdef PERL_OLD_COPY_ON_WRITE
			    !SvIsCOW(PL_curpad[po])
		#else
			    !SvFAKE(PL_curpad[po])
		#endif
			    )
			    SvREADONLY_off(PL_curpad[po]);	/* could be a freed constant */
		#endif
		    }
     1190561        if ((I32)po < PL_padix)
      134599    	PL_padix = po - 1;
		}
		
		
		
		/*
		=for apidoc do_dump_pad
		
		Dump the contents of a padlist
		
		=cut
		*/
		
		void
		Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full)
           2    {
           2        const AV *pad_name;
           2        const AV *pad;
           2        SV **pname;
           2        SV **ppad;
           2        I32 ix;
		
           2        if (!padlist) {
      ######    	return;
		    }
           2        pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE);
           2        pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE);
           2        pname = AvARRAY(pad_name);
           2        ppad = AvARRAY(pad);
           2        Perl_dump_indent(aTHX_ level, file,
			    "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n",
			    PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad)
		    );
		
          50        for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
          48            const SV *namesv = pname[ix];
          48    	if (namesv && namesv == &PL_sv_undef) {
          45    	    namesv = Nullsv;
			}
          48    	if (namesv) {
           3    	    if (SvFAKE(namesv))
           1    		Perl_dump_indent(aTHX_ level+1, file,
				    "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n",
				    (int) ix,
				    PTR2UV(ppad[ix]),
				    (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
				    SvPVX_const(namesv),
				    (unsigned long)SvIVX(namesv),
				    (unsigned long)SvNVX(namesv)
		
				);
			    else
           2    		Perl_dump_indent(aTHX_ level+1, file,
				    "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n",
				    (int) ix,
				    PTR2UV(ppad[ix]),
				    (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
				    (long)U_32(SvNVX(namesv)),
				    (long)SvIVX(namesv),
				    SvPVX_const(namesv)
				);
			}
          45    	else if (full) {
      ######    	    Perl_dump_indent(aTHX_ level+1, file,
				"%2d. 0x%"UVxf"<%lu>\n",
				(int) ix,
				PTR2UV(ppad[ix]),
				(unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0)
			    );
			}
		    }
		}
		
		
		
		/*
		=for apidoc cv_dump
		
		dump the contents of a CV
		
		=cut
		*/
		
		#ifdef DEBUGGING
		STATIC void
		S_cv_dump(pTHX_ const CV *cv, const char *title)
      ######    {
      ######        const CV * const outside = CvOUTSIDE(cv);
      ######        AV* const padlist = CvPADLIST(cv);
		
      ######        PerlIO_printf(Perl_debug_log,
				  "  %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n",
				  title,
				  PTR2UV(cv),
				  (CvANON(cv) ? "ANON"
				   : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT"
				   : (cv == PL_main_cv) ? "MAIN"
				   : CvUNIQUE(cv) ? "UNIQUE"
				   : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
				  PTR2UV(outside),
				  (!outside ? "null"
				   : CvANON(outside) ? "ANON"
				   : (outside == PL_main_cv) ? "MAIN"
				   : CvUNIQUE(outside) ? "UNIQUE"
				   : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
		
      ######        PerlIO_printf(Perl_debug_log,
				    "    PADLIST = 0x%"UVxf"\n", PTR2UV(padlist));
      ######        do_dump_pad(1, Perl_debug_log, padlist, 1);
		}
		#endif /* DEBUGGING */
		
		
		
		
		
		/*
		=for apidoc cv_clone
		
		Clone a CV: make a new CV which points to the same code etc, but which
		has a newly-created pad built by copying the prototype pad and capturing
		any outer lexicals.
		
		=cut
		*/
		
		CV *
		Perl_cv_clone(pTHX_ CV *proto)
       15427    {
		    dVAR;
       15427        I32 ix;
       15427        AV* const protopadlist = CvPADLIST(proto);
       15427        const AV* const protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
       15427        const AV* const protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
       15427        SV** const pname = AvARRAY(protopad_name);
       15427        SV** const ppad = AvARRAY(protopad);
       15427        const I32 fname = AvFILLp(protopad_name);
       15427        const I32 fpad = AvFILLp(protopad);
       15427        CV* cv;
       15427        SV** outpad;
       15427        CV* outside;
       15427        long depth;
		
       15427        assert(!CvUNIQUE(proto));
		
		    /* Since cloneable anon subs can be nested, CvOUTSIDE may point
		     * to a prototype; we instead want the cloned parent who called us.
		     * Note that in general for formats, CvOUTSIDE != find_runcv */
		
       15427        outside = CvOUTSIDE(proto);
       15427        if (outside && CvCLONE(outside) && ! CvCLONED(outside))
          47    	outside = find_runcv(NULL);
       15427        depth = CvDEPTH(outside);
       15427        assert(depth || SvTYPE(proto) == SVt_PVFM);
       15427        if (!depth)
           2    	depth = 1;
       15427        assert(CvPADLIST(outside));
		
       15427        ENTER;
       15427        SAVESPTR(PL_compcv);
		
       15427        cv = PL_compcv = (CV*)NEWSV(1104, 0);
       15427        sv_upgrade((SV *)cv, SvTYPE(proto));
       15427        CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE);
       15427        CvCLONED_on(cv);
		
		#ifdef USE_ITHREADS
		    CvFILE(cv)		= CvXSUB(proto) ? CvFILE(proto)
							: savepv(CvFILE(proto));
		#else
       15427        CvFILE(cv)		= CvFILE(proto);
		#endif
       15427        CvGV(cv)		= CvGV(proto);
       15427        CvSTASH(cv)		= CvSTASH(proto);
       15427        OP_REFCNT_LOCK;
       15427        CvROOT(cv)		= OpREFCNT_inc(CvROOT(proto));
       15427        OP_REFCNT_UNLOCK;
       15427        CvSTART(cv)		= CvSTART(proto);
       15427        CvOUTSIDE(cv)	= (CV*)SvREFCNT_inc(outside);
       15427        CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto);
		
       15427        if (SvPOK(proto))
        2682    	sv_setpvn((SV*)cv, SvPVX_const(proto), SvCUR(proto));
		
       15427        CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE);
		
       15427        av_fill(PL_comppad, fpad);
      127924        for (ix = fname; ix >= 0; ix--)
      112497    	av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix]));
		
       15427        PL_curpad = AvARRAY(PL_comppad);
		
       15427        outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]);
		
      112497        for (ix = fpad; ix > 0; ix--) {
       97070    	SV* const namesv = (ix <= fname) ? pname[ix] : Nullsv;
       97070    	SV *sv = Nullsv;
       97070    	if (namesv && namesv != &PL_sv_undef) { /* lexical */
       25486    	    if (SvFAKE(namesv)) {   /* lexical from outside? */
       19690    		sv = outpad[(I32)SvNVX(namesv)];
       19690    		assert(sv);
				/* formats may have an inactive parent */
       19690    		if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) {
      ######    		    if (ckWARN(WARN_CLOSURE))
      ######    			Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
					    "Variable \"%s\" is not available", SvPVX_const(namesv));
      ######    		    sv = Nullsv;
				}
				else {
       19690    		    assert(!SvPADSTALE(sv));
       19690    		    sv = SvREFCNT_inc(sv);
				}
			    }
       25486    	    if (!sv) {
        5796                    const char sigil = SvPVX_const(namesv)[0];
        5796                    if (sigil == '&')
         370    		    sv = SvREFCNT_inc(ppad[ix]);
        5426                    else if (sigil == '@')
         951    		    sv = (SV*)newAV();
        4475                    else if (sigil == '%')
           6    		    sv = (SV*)newHV();
				else
        4469    		    sv = NEWSV(0, 0);
        5796    		SvPADMY_on(sv);
			    }
			}
       71584    	else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) {
       71584    	    sv = SvREFCNT_inc(ppad[ix]);
			}
			else {
       71584    	    sv = NEWSV(0, 0);
       71584    	    SvPADTMP_on(sv);
			}
       97070    	PL_curpad[ix] = sv;
		    }
		
		    DEBUG_Xv(
			PerlIO_printf(Perl_debug_log, "\nPad CV clone\n");
			cv_dump(outside, "Outside");
			cv_dump(proto,	 "Proto");
			cv_dump(cv,	 "To");
       15427        );
		
       15427        LEAVE;
		
       15427        if (CvCONST(cv)) {
			/* Constant sub () { $x } closing over $x - see lib/constant.pm:
			 * The prototype was marked as a candiate for const-ization,
			 * so try to grab the current const value, and if successful,
			 * turn into a const sub:
			 */
        2641    	SV* const_sv = op_const_sv(CvSTART(cv), cv);
        2641    	if (const_sv) {
        2640    	    SvREFCNT_dec(cv);
        2640    	    cv = newCONSTSUB(CvSTASH(proto), 0, const_sv);
			}
			else {
           1    	    CvCONST_off(cv);
			}
		    }
		
       15427        return cv;
		}
		
		
		/*
		=for apidoc pad_fixup_inner_anons
		
		For any anon CVs in the pad, change CvOUTSIDE of that CV from
		old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be
		moved to a pre-existing CV struct.
		
		=cut
		*/
		
		void
		Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv)
        5541    {
        5541        I32 ix;
        5541        AV * const comppad_name = (AV*)AvARRAY(padlist)[0];
        5541        AV * const comppad = (AV*)AvARRAY(padlist)[1];
        5541        SV ** const namepad = AvARRAY(comppad_name);
        5541        SV ** const curpad = AvARRAY(comppad);
      180916        for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
      175375            const SV *namesv = namepad[ix];
      175375    	if (namesv && namesv != &PL_sv_undef
			    && *SvPVX_const(namesv) == '&')
			{
           1    	    CV *innercv = (CV*)curpad[ix];
           1    	    assert(CvWEAKOUTSIDE(innercv));
           1    	    assert(CvOUTSIDE(innercv) == old_cv);
           1    	    CvOUTSIDE(innercv) = new_cv;
			}
		    }
		}
		
		
		/*
		=for apidoc pad_push
		
		Push a new pad frame onto the padlist, unless there's already a pad at
		this depth, in which case don't bother creating a new one.  Then give
		the new pad an @_ in slot zero.
		
		=cut
		*/
		
		void
		Perl_pad_push(pTHX_ PADLIST *padlist, int depth)
    10943929    {
    10943929        if (depth <= AvFILLp(padlist))
    10873586    	return;
		
		    {
       70343    	SV** svp = AvARRAY(padlist);
       70343    	AV *newpad = newAV();
       70343    	SV **oldpad = AvARRAY(svp[depth-1]);
       70343    	I32 ix = AvFILLp((AV*)svp[1]);
       70343            const I32 names_fill = AvFILLp((AV*)svp[0]);
       70343    	SV** names = AvARRAY(svp[0]);
      350817    	AV *av;
		
      631291    	for ( ;ix > 0; ix--) {
      280474    	    if (names_fill >= ix && names[ix] != &PL_sv_undef) {
       16512    		const char sigil = SvPVX_const(names[ix])[0];
       16512    		if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') {
				    /* outer lexical or anon code */
        2094    		    av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
				}
				else {		/* our own lexical */
       14418    		    SV *sv; 
       14418    		    if (sigil == '@')
         701    			sv = (SV*)newAV();
       13717    		    else if (sigil == '%')
         175    			sv = (SV*)newHV();
				    else
       13542    			sv = NEWSV(0, 0);
       14418    		    av_store(newpad, ix, sv);
       14418    		    SvPADMY_on(sv);
				}
			    }
      263962    	    else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) {
      263962    		av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
			    }
			    else {
				/* save temporaries on recursion? */
      263962    		SV *sv = NEWSV(0, 0);
      263962    		av_store(newpad, ix, sv);
      263962    		SvPADTMP_on(sv);
			    }
			}
       70343    	av = newAV();
       70343    	av_extend(av, 0);
       70343    	av_store(newpad, 0, (SV*)av);
       70343    	AvREIFY_only(av);
		
       70343    	av_store(padlist, depth, (SV*)newpad);
       70343    	AvFILLp(padlist) = depth;
		    }
		}
		
		
		HV *
		Perl_pad_compname_type(pTHX_ const PADOFFSET po)
          44    {
          44        SV** const av = av_fetch(PL_comppad_name, po, FALSE);
          44        if ( SvFLAGS(*av) & SVpad_TYPED ) {
           7            return SvSTASH(*av);
		    }
          37        return Nullhv;
		}
		
		/*
		 * Local variables:
		 * c-indentation-style: bsd
		 * c-basic-offset: 4
		 * indent-tabs-mode: t
		 * End:
		 *
		 * ex: set ts=8 sts=4 sw=4 noet:
		 */