3 * Copyright (C) 2002, 2003, 2004, 2005 by Larry Wall and others
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
8 * "Anyway: there was this Mr Frodo left an orphan and stranded, as you
9 * might say, among those queer Bucklanders, being brought up anyhow in
10 * Brandy Hall. A regular warren, by all accounts. Old Master Gorbadoc
11 * never had fewer than a couple of hundred relations in the place. Mr
12 * Bilbo never did a kinder deed than when he brought the lad back to
13 * live among decent folk." --the Gaffer
17 * As of Sept 2002, this file is new and may be in a state of flux for
18 * a while. I've marked things I intent to come back and look at further
19 * with an 'XXX DAPM' comment.
23 =head1 Pad Data Structures
25 This file contains the functions that create and manipulate scratchpads,
26 which are array-of-array data structures attached to a CV (ie a sub)
27 and which store lexical variables and opcode temporary and per-thread
30 =for apidoc m|AV *|CvPADLIST|CV *cv
31 CV's can have CvPADLIST(cv) set to point to an AV.
33 For these purposes "forms" are a kind-of CV, eval""s are too (except they're
34 not callable at will and are always thrown away after the eval"" is done
35 executing). Require'd files are simply evals without any outer lexical
38 XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad,
39 but that is really the callers pad (a slot of which is allocated by
42 The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items
43 is managed "manual" (mostly in pad.c) rather than normal av.c rules.
44 The items in the AV are not SVs as for a normal AV, but other AVs:
46 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather
47 the "static type information" for lexicals.
49 The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that
50 depth of recursion into the CV.
51 The 0'th slot of a frame AV is an AV which is @_.
52 other entries are storage for variables and op targets.
55 C<PL_comppad_name> is set to the names AV.
56 C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1.
57 C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)).
59 During execution, C<PL_comppad> and C<PL_curpad> refer to the live
60 frame of the currently executing sub.
62 Iterating over the names AV iterates over all possible pad
63 items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having
64 &PL_sv_undef "names" (see pad_alloc()).
66 Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names.
67 The rest are op targets/GVs/constants which are statically allocated
68 or resolved at compile time. These don't have names by which they
69 can be looked up from Perl code at run time through eval"" like
70 my/our variables can be. Since they can't be looked up by "name"
71 but only by their index allocated at compile time (which is usually
72 in PL_op->op_targ), wasting a name SV for them doesn't make sense.
74 The SVs in the names AV have their PV being the name of the variable.
75 NV+1..IV inclusive is a range of cop_seq numbers for which the name is
76 valid. For typed lexicals name SV is SVt_PVMG and SvSTASH points at the
77 type. For C<our> lexicals, the type is SVt_PVGV, and GvSTASH points at the
78 stash of the associated global (so that duplicate C<our> delarations in the
79 same package can be detected). SvCUR is sometimes hijacked to
80 store the generation number during compilation.
82 If SvFAKE is set on the name SV, then that slot in the frame AV is
83 a REFCNT'ed reference to a lexical from "outside". In this case,
84 the name SV does not use NVX and IVX to store a cop_seq range, since it is
85 in scope throughout. Instead IVX stores some flags containing info about
86 the real lexical (is it declared in an anon, and is it capable of being
87 instantiated multiple times?), and for fake ANONs, NVX contains the index
88 within the parent's pad where the lexical's value is stored, to make
91 If the 'name' is '&' the corresponding entry in frame AV
92 is a CV representing a possible closure.
93 (SvFAKE and name of '&' is not a meaningful combination currently but could
94 become so if C<my sub foo {}> is implemented.)
96 Note that formats are treated as anon subs, and are cloned each time
97 write is called (if necessary).
99 The flag SVf_PADSTALE is cleared on lexicals each time the my() is executed,
100 and set on scope exit. This allows the 'Variable $x is not available' warning
101 to be generated in evals, such as
103 { my $x = 1; sub f { eval '$x'} } f();
110 #define PERL_IN_PAD_C
114 #define PAD_MAX 999999999
121 Create a new compiling padlist, saving and updating the various global
122 vars at the same time as creating the pad itself. The following flags
123 can be OR'ed together:
125 padnew_CLONE this pad is for a cloned CV
126 padnew_SAVE save old globals
127 padnew_SAVESUB also save extra stuff for start of sub
133 Perl_pad_new(pTHX_ int flags)
135 AV *padlist, *padname, *pad;
137 ASSERT_CURPAD_LEGAL("pad_new");
139 /* XXX DAPM really need a new SAVEt_PAD which restores all or most
140 * vars (based on flags) rather than storing vals + addresses for
141 * each individually. Also see pad_block_start.
142 * XXX DAPM Try to see whether all these conditionals are required
145 /* save existing state, ... */
147 if (flags & padnew_SAVE) {
149 SAVESPTR(PL_comppad_name);
150 if (! (flags & padnew_CLONE)) {
152 SAVEI32(PL_comppad_name_fill);
153 SAVEI32(PL_min_intro_pending);
154 SAVEI32(PL_max_intro_pending);
155 SAVEI32(PL_cv_has_eval);
156 if (flags & padnew_SAVESUB) {
157 SAVEI32(PL_pad_reset_pending);
161 /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be
162 * saved - check at some pt that this is okay */
164 /* ... create new pad ... */
170 if (flags & padnew_CLONE) {
171 /* XXX DAPM I dont know why cv_clone needs it
172 * doing differently yet - perhaps this separate branch can be
173 * dispensed with eventually ???
176 AV * const a0 = newAV(); /* will be @_ */
178 av_store(pad, 0, (SV*)a0);
179 AvFLAGS(a0) = AVf_REIFY;
182 av_store(pad, 0, Nullsv);
186 av_store(padlist, 0, (SV*)padname);
187 av_store(padlist, 1, (SV*)pad);
189 /* ... then update state variables */
191 PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE));
192 PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE));
193 PL_curpad = AvARRAY(PL_comppad);
195 if (! (flags & padnew_CLONE)) {
196 PL_comppad_name_fill = 0;
197 PL_min_intro_pending = 0;
202 DEBUG_X(PerlIO_printf(Perl_debug_log,
203 "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf
204 " name=0x%"UVxf" flags=0x%"UVxf"\n",
205 PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv),
206 PTR2UV(padname), (UV)flags
210 return (PADLIST*)padlist;
214 =for apidoc pad_undef
216 Free the padlist associated with a CV.
217 If parts of it happen to be current, we null the relevant
218 PL_*pad* global vars so that we don't have any dangling references left.
219 We also repoint the CvOUTSIDE of any about-to-be-orphaned
220 inner subs to the outer of this cv.
222 (This function should really be called pad_free, but the name was already
229 Perl_pad_undef(pTHX_ CV* cv)
232 const PADLIST *padlist = CvPADLIST(cv);
236 if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */
239 DEBUG_X(PerlIO_printf(Perl_debug_log,
240 "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n",
241 PTR2UV(cv), PTR2UV(padlist))
244 /* detach any '&' anon children in the pad; if afterwards they
245 * are still live, fix up their CvOUTSIDEs to point to our outside,
247 /* XXX DAPM for efficiency, we should only do this if we know we have
248 * children, or integrate this loop with general cleanup */
250 if (!PL_dirty) { /* don't bother during global destruction */
251 CV *outercv = CvOUTSIDE(cv);
252 const U32 seq = CvOUTSIDE_SEQ(cv);
253 AV *comppad_name = (AV*)AvARRAY(padlist)[0];
254 SV **namepad = AvARRAY(comppad_name);
255 AV *comppad = (AV*)AvARRAY(padlist)[1];
256 SV **curpad = AvARRAY(comppad);
257 for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
258 SV *namesv = namepad[ix];
259 if (namesv && namesv != &PL_sv_undef
260 && *SvPVX(namesv) == '&')
262 CV * const innercv = (CV*)curpad[ix];
263 namepad[ix] = Nullsv;
264 SvREFCNT_dec(namesv);
266 if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */
268 SvREFCNT_dec(innercv);
270 if (SvREFCNT(innercv) /* in use, not just a prototype */
271 && CvOUTSIDE(innercv) == cv)
273 assert(CvWEAKOUTSIDE(innercv));
274 /* don't relink to grandfather if he's being freed */
275 if (outercv && SvREFCNT(outercv)) {
276 CvWEAKOUTSIDE_off(innercv);
277 CvOUTSIDE(innercv) = outercv;
278 CvOUTSIDE_SEQ(innercv) = seq;
279 (void)SvREFCNT_inc(outercv);
282 CvOUTSIDE(innercv) = Nullcv;
291 ix = AvFILLp(padlist);
293 SV* sv = AvARRAY(padlist)[ix--];
296 if (sv == (SV*)PL_comppad_name)
297 PL_comppad_name = Nullav;
298 else if (sv == (SV*)PL_comppad) {
299 PL_comppad = Null(PAD*);
300 PL_curpad = Null(SV**);
304 SvREFCNT_dec((SV*)CvPADLIST(cv));
305 CvPADLIST(cv) = Null(PADLIST*);
312 =for apidoc pad_add_name
314 Create a new name and associated PADMY SV in the current pad; return the
316 If C<typestash> is valid, the name is for a typed lexical; set the
317 name's stash to that value.
318 If C<ourstash> is valid, it's an our lexical, set the name's
319 GvSTASH to that value
321 If fake, it means we're cloning an existing entry
327 Perl_pad_add_name(pTHX_ const char *name, HV* typestash, HV* ourstash, bool fake)
329 PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY);
330 SV* namesv = NEWSV(1102, 0);
332 ASSERT_CURPAD_ACTIVE("pad_add_name");
335 sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV);
336 sv_setpv(namesv, name);
339 SvFLAGS(namesv) |= SVpad_TYPED;
340 SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) typestash);
343 SvFLAGS(namesv) |= SVpad_OUR;
344 GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash);
347 av_store(PL_comppad_name, offset, namesv);
350 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
351 "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name));
354 /* not yet introduced */
355 SvNVX(namesv) = (NV)PAD_MAX; /* min */
356 SvIVX(namesv) = 0; /* max */
358 if (!PL_min_intro_pending)
359 PL_min_intro_pending = offset;
360 PL_max_intro_pending = offset;
361 /* if it's not a simple scalar, replace with an AV or HV */
362 /* XXX DAPM since slot has been allocated, replace
363 * av_store with PL_curpad[offset] ? */
365 av_store(PL_comppad, offset, (SV*)newAV());
366 else if (*name == '%')
367 av_store(PL_comppad, offset, (SV*)newHV());
368 SvPADMY_on(PL_curpad[offset]);
369 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
370 "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n",
371 (long)offset, name, PTR2UV(PL_curpad[offset])));
381 =for apidoc pad_alloc
383 Allocate a new my or tmp pad entry. For a my, simply push a null SV onto
384 the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards
385 for a slot which has no name and and no active value.
390 /* XXX DAPM integrate alloc(), add_name() and add_anon(),
391 * or at least rationalise ??? */
395 Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
400 ASSERT_CURPAD_ACTIVE("pad_alloc");
402 if (AvARRAY(PL_comppad) != PL_curpad)
403 Perl_croak(aTHX_ "panic: pad_alloc");
404 if (PL_pad_reset_pending)
406 if (tmptype & SVs_PADMY) {
407 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
408 retval = AvFILLp(PL_comppad);
411 SV **names = AvARRAY(PL_comppad_name);
412 const SSize_t names_fill = AvFILLp(PL_comppad_name);
415 * "foreach" index vars temporarily become aliases to non-"my"
416 * values. Thus we must skip, not just pad values that are
417 * marked as current pad values, but also those with names.
419 /* HVDS why copy to sv here? we don't seem to use it */
420 if (++PL_padix <= names_fill &&
421 (sv = names[PL_padix]) && sv != &PL_sv_undef)
423 sv = *av_fetch(PL_comppad, PL_padix, TRUE);
424 if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) &&
425 !IS_PADGV(sv) && !IS_PADCONST(sv))
430 SvFLAGS(sv) |= tmptype;
431 PL_curpad = AvARRAY(PL_comppad);
433 DEBUG_X(PerlIO_printf(Perl_debug_log,
434 "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n",
435 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval,
436 PL_op_name[optype]));
437 #ifdef DEBUG_LEAKING_SCALARS
438 sv->sv_debug_optype = optype;
439 sv->sv_debug_inpad = 1;
441 return (PADOFFSET)retval;
445 =for apidoc pad_add_anon
447 Add an anon code entry to the current compiling pad
453 Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type)
458 name = NEWSV(1106, 0);
459 sv_upgrade(name, SVt_PVNV);
460 sv_setpvn(name, "&", 1);
463 ix = pad_alloc(op_type, SVs_PADMY);
464 av_store(PL_comppad_name, ix, name);
465 /* XXX DAPM use PL_curpad[] ? */
466 av_store(PL_comppad, ix, sv);
469 /* to avoid ref loops, we never have parent + child referencing each
470 * other simultaneously */
471 if (CvOUTSIDE((CV*)sv)) {
472 assert(!CvWEAKOUTSIDE((CV*)sv));
473 CvWEAKOUTSIDE_on((CV*)sv);
474 SvREFCNT_dec(CvOUTSIDE((CV*)sv));
482 =for apidoc pad_check_dup
484 Check for duplicate declarations: report any of:
485 * a my in the current scope with the same name;
486 * an our (anywhere in the pad) with the same name and the same stash
488 C<is_our> indicates that the name to check is an 'our' declaration
493 /* XXX DAPM integrate this into pad_add_name ??? */
496 Perl_pad_check_dup(pTHX_ const char *name, bool is_our, const HV *ourstash)
501 ASSERT_CURPAD_ACTIVE("pad_check_dup");
502 if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0)
503 return; /* nothing to check */
505 svp = AvARRAY(PL_comppad_name);
506 top = AvFILLp(PL_comppad_name);
507 /* check the current scope */
508 /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same
510 for (off = top; (I32)off > PL_comppad_name_floor; off--) {
512 && sv != &PL_sv_undef
514 && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
516 || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash))
517 && strEQ(name, SvPVX(sv)))
519 Perl_warner(aTHX_ packWARN(WARN_MISC),
520 "\"%s\" variable %s masks earlier declaration in same %s",
521 (is_our ? "our" : "my"),
523 (SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
528 /* check the rest of the pad */
532 && sv != &PL_sv_undef
534 && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
535 && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)
536 && strEQ(name, SvPVX(sv)))
538 Perl_warner(aTHX_ packWARN(WARN_MISC),
539 "\"our\" variable %s redeclared", name);
540 Perl_warner(aTHX_ packWARN(WARN_MISC),
541 "\t(Did you mean \"local\" instead of \"our\"?)\n");
544 } while ( off-- > 0 );
550 =for apidoc pad_findmy
552 Given a lexical name, try to find its offset, first in the current pad,
553 or failing that, in the pads of any lexically enclosing subs (including
554 the complications introduced by eval). If the name is found in an outer pad,
555 then a fake entry is added to the current pad.
556 Returns the offset in the current pad, or NOT_IN_PAD on failure.
562 Perl_pad_findmy(pTHX_ const char *name)
570 offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1,
571 Null(SV**), &out_sv, &out_flags);
572 if (offset != NOT_IN_PAD)
575 /* look for an our that's being introduced; this allows
576 * our $foo = 0 unless defined $foo;
577 * to not give a warning. (Yes, this is a hack) */
579 nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0];
580 name_svp = AvARRAY(nameav);
581 for (offset = AvFILLp(nameav); offset > 0; offset--) {
582 const SV *namesv = name_svp[offset];
583 if (namesv && namesv != &PL_sv_undef
585 && (SvFLAGS(namesv) & SVpad_OUR)
586 && strEQ(SvPVX(namesv), name)
587 && U_32(SvNVX(namesv)) == PAD_MAX /* min */
595 * Returns the offset of a lexical $_, if there is one, at run time.
596 * Used by the UNDERBAR XS macro.
600 Perl_find_rundefsvoffset(pTHX)
604 return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1,
605 Null(SV**), &out_sv, &out_flags);
609 =for apidoc pad_findlex
611 Find a named lexical anywhere in a chain of nested pads. Add fake entries
612 in the inner pads if it's found in an outer one.
614 Returns the offset in the bottom pad of the lex or the fake lex.
615 cv is the CV in which to start the search, and seq is the current cop_seq
616 to match against. If warn is true, print appropriate warnings. The out_*
617 vars return values, and so are pointers to where the returned values
618 should be stored. out_capture, if non-null, requests that the innermost
619 instance of the lexical is captured; out_name_sv is set to the innermost
620 matched namesv or fake namesv; out_flags returns the flags normally
621 associated with the IVX field of a fake namesv.
623 Note that pad_findlex() is recursive; it recurses up the chain of CVs,
624 then comes back down, adding fake entries as it goes. It has to be this way
625 because fake namesvs in anon protoypes have to store in NVX the index into
631 /* Flags set in the SvIVX field of FAKE namesvs */
633 #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */
634 #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */
636 /* the CV has finished being compiled. This is not a sufficient test for
637 * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */
638 #define CvCOMPILED(cv) CvROOT(cv)
640 /* the CV does late binding of its lexicals */
641 #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM)
645 S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn,
646 SV** out_capture, SV** out_name_sv, int *out_flags)
648 I32 offset, new_offset;
651 const AV *padlist = CvPADLIST(cv);
655 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
656 "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n",
657 PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" ));
659 /* first, search this pad */
661 if (padlist) { /* not an undef CV */
663 const AV *nameav = (AV*)AvARRAY(padlist)[0];
664 SV **name_svp = AvARRAY(nameav);
666 for (offset = AvFILLp(nameav); offset > 0; offset--) {
667 const SV *namesv = name_svp[offset];
668 if (namesv && namesv != &PL_sv_undef
669 && strEQ(SvPVX(namesv), name))
672 fake_offset = offset; /* in case we don't find a real one */
673 else if ( seq > U_32(SvNVX(namesv)) /* min */
674 && seq <= (U32)SvIVX(namesv)) /* max */
679 if (offset > 0 || fake_offset > 0 ) { /* a match! */
680 if (offset > 0) { /* not fake */
682 *out_name_sv = name_svp[offset]; /* return the namesv */
684 /* set PAD_FAKELEX_MULTI if this lex can have multiple
685 * instances. For now, we just test !CvUNIQUE(cv), but
686 * ideally, we should detect my's declared within loops
687 * etc - this would allow a wider range of 'not stayed
688 * shared' warnings. We also treated alreadly-compiled
689 * lexes as not multi as viewed from evals. */
691 *out_flags = CvANON(cv) ?
693 (!CvUNIQUE(cv) && ! CvCOMPILED(cv))
694 ? PAD_FAKELEX_MULTI : 0;
696 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
697 "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n",
698 PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)),
699 (long)SvIVX(*out_name_sv)));
701 else { /* fake match */
702 offset = fake_offset;
703 *out_name_sv = name_svp[offset]; /* return the namesv */
704 *out_flags = SvIVX(*out_name_sv);
705 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
706 "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n",
707 PTR2UV(cv), (long)offset, (unsigned long)*out_flags,
708 (unsigned long)SvNVX(*out_name_sv)
712 /* return the lex? */
717 if ((SvFLAGS(*out_name_sv) & SVpad_OUR)) {
718 *out_capture = Nullsv;
722 /* trying to capture from an anon prototype? */
724 ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv)
725 : *out_flags & PAD_FAKELEX_ANON)
727 if (warn && ckWARN(WARN_CLOSURE))
728 Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
729 "Variable \"%s\" is not available", name);
730 *out_capture = Nullsv;
736 if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI)
737 && warn && ckWARN(WARN_CLOSURE)) {
739 Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
740 "Variable \"%s\" will not stay shared", name);
743 if (fake_offset && CvANON(cv)
744 && CvCLONE(cv) &&!CvCLONED(cv))
747 /* not yet caught - look further up */
748 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
749 "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n",
752 pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv),
753 newwarn, out_capture, out_name_sv, out_flags);
758 *out_capture = AvARRAY((AV*)AvARRAY(padlist)[
759 CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset];
760 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
761 "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n",
762 PTR2UV(cv), PTR2UV(*out_capture)));
764 if (SvPADSTALE(*out_capture)) {
765 if (ckWARN(WARN_CLOSURE))
766 Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
767 "Variable \"%s\" is not available", name);
768 *out_capture = Nullsv;
773 *out_capture = sv_2mortal((SV*)newAV());
774 else if (*name == '%')
775 *out_capture = sv_2mortal((SV*)newHV());
777 *out_capture = sv_newmortal();
785 /* it's not in this pad - try above */
790 /* out_capture non-null means caller wants us to capture lex; in
791 * addition we capture ourselves unless it's an ANON/format */
792 new_capturep = out_capture ? out_capture :
793 CvLATE(cv) ? Null(SV**) : &new_capture;
795 offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1,
796 new_capturep, out_name_sv, out_flags);
797 if (offset == NOT_IN_PAD)
800 /* found in an outer CV. Add appropriate fake entry to this pad */
802 /* don't add new fake entries (via eval) to CVs that we have already
803 * finished compiling, or to undef CVs */
804 if (CvCOMPILED(cv) || !padlist)
805 return 0; /* this dummy (and invalid) value isnt used by the caller */
809 AV *ocomppad_name = PL_comppad_name;
810 PAD *ocomppad = PL_comppad;
811 PL_comppad_name = (AV*)AvARRAY(padlist)[0];
812 PL_comppad = (AV*)AvARRAY(padlist)[1];
813 PL_curpad = AvARRAY(PL_comppad);
815 new_offset = pad_add_name(
817 (SvFLAGS(*out_name_sv) & SVpad_TYPED)
818 ? SvSTASH(*out_name_sv) : Nullhv,
819 (SvFLAGS(*out_name_sv) & SVpad_OUR)
820 ? GvSTASH(*out_name_sv) : Nullhv,
824 new_namesv = AvARRAY(PL_comppad_name)[new_offset];
825 SvIVX(new_namesv) = *out_flags;
827 SvNVX(new_namesv) = (NV)0;
828 if (SvFLAGS(new_namesv) & SVpad_OUR) {
831 else if (CvLATE(cv)) {
832 /* delayed creation - just note the offset within parent pad */
833 SvNVX(new_namesv) = (NV)offset;
837 /* immediate creation - capture outer value right now */
838 av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep));
839 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
840 "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n",
841 PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset));
843 *out_name_sv = new_namesv;
844 *out_flags = SvIVX(new_namesv);
846 PL_comppad_name = ocomppad_name;
847 PL_comppad = ocomppad;
848 PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **);
857 Get the value at offset po in the current pad.
858 Use macro PAD_SV instead of calling this function directly.
865 Perl_pad_sv(pTHX_ PADOFFSET po)
867 ASSERT_CURPAD_ACTIVE("pad_sv");
870 Perl_croak(aTHX_ "panic: pad_sv po");
871 DEBUG_X(PerlIO_printf(Perl_debug_log,
872 "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n",
873 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po]))
875 return PL_curpad[po];
880 =for apidoc pad_setsv
882 Set the entry at offset po in the current pad to sv.
883 Use the macro PAD_SETSV() rather than calling this function directly.
890 Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv)
892 ASSERT_CURPAD_ACTIVE("pad_setsv");
894 DEBUG_X(PerlIO_printf(Perl_debug_log,
895 "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n",
896 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv))
905 =for apidoc pad_block_start
907 Update the pad compilation state variables on entry to a new block
913 * - integrate this in general state-saving routine ???
914 * - combine with the state-saving going on in pad_new ???
915 * - introduce a new SAVE type that does all this in one go ?
919 Perl_pad_block_start(pTHX_ int full)
921 ASSERT_CURPAD_ACTIVE("pad_block_start");
922 SAVEI32(PL_comppad_name_floor);
923 PL_comppad_name_floor = AvFILLp(PL_comppad_name);
925 PL_comppad_name_fill = PL_comppad_name_floor;
926 if (PL_comppad_name_floor < 0)
927 PL_comppad_name_floor = 0;
928 SAVEI32(PL_min_intro_pending);
929 SAVEI32(PL_max_intro_pending);
930 PL_min_intro_pending = 0;
931 SAVEI32(PL_comppad_name_fill);
932 SAVEI32(PL_padix_floor);
933 PL_padix_floor = PL_padix;
934 PL_pad_reset_pending = FALSE;
941 "Introduce" my variables to visible status.
953 ASSERT_CURPAD_ACTIVE("intro_my");
954 if (! PL_min_intro_pending)
955 return PL_cop_seqmax;
957 svp = AvARRAY(PL_comppad_name);
958 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
959 if ((sv = svp[i]) && sv != &PL_sv_undef
960 && !SvFAKE(sv) && !SvIVX(sv))
962 SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */
963 SvNVX(sv) = (NV)PL_cop_seqmax;
964 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
965 "Pad intromy: %ld \"%s\", (%ld,%ld)\n",
967 (long)U_32(SvNVX(sv)), (long)SvIVX(sv))
971 PL_min_intro_pending = 0;
972 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
973 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
974 "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1)));
976 return PL_cop_seqmax++;
980 =for apidoc pad_leavemy
982 Cleanup at end of scope during compilation: set the max seq number for
983 lexicals in this scope and warn of any lexicals that never got introduced.
989 Perl_pad_leavemy(pTHX)
992 SV **svp = AvARRAY(PL_comppad_name);
994 PL_pad_reset_pending = FALSE;
996 ASSERT_CURPAD_ACTIVE("pad_leavemy");
997 if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) {
998 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
1000 if ((sv = svp[off]) && sv != &PL_sv_undef
1001 && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL))
1002 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1003 "%"SVf" never introduced", sv);
1006 /* "Deintroduce" my variables that are leaving with this scope. */
1007 for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) {
1009 if ((sv = svp[off]) && sv != &PL_sv_undef
1010 && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX)
1012 SvIVX(sv) = PL_cop_seqmax;
1013 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1014 "Pad leavemy: %ld \"%s\", (%ld,%ld)\n",
1015 (long)off, SvPVX(sv),
1016 (long)U_32(SvNVX(sv)), (long)SvIVX(sv))
1021 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1022 "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax));
1027 =for apidoc pad_swipe
1029 Abandon the tmp in the current pad at offset po and replace with a
1036 Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust)
1038 ASSERT_CURPAD_LEGAL("pad_swipe");
1041 if (AvARRAY(PL_comppad) != PL_curpad)
1042 Perl_croak(aTHX_ "panic: pad_swipe curpad");
1044 Perl_croak(aTHX_ "panic: pad_swipe po");
1046 DEBUG_X(PerlIO_printf(Perl_debug_log,
1047 "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n",
1048 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po));
1051 SvPADTMP_off(PL_curpad[po]);
1053 SvREFCNT_dec(PL_curpad[po]);
1055 PL_curpad[po] = NEWSV(1107,0);
1056 SvPADTMP_on(PL_curpad[po]);
1057 if ((I32)po < PL_padix)
1063 =for apidoc pad_reset
1065 Mark all the current temporaries for reuse
1070 /* XXX pad_reset() is currently disabled because it results in serious bugs.
1071 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
1072 * on the stack by OPs that use them, there are several ways to get an alias
1073 * to a shared TARG. Such an alias will change randomly and unpredictably.
1074 * We avoid doing this until we can think of a Better Way.
1077 Perl_pad_reset(pTHX)
1079 #ifdef USE_BROKEN_PAD_RESET
1080 if (AvARRAY(PL_comppad) != PL_curpad)
1081 Perl_croak(aTHX_ "panic: pad_reset curpad");
1083 DEBUG_X(PerlIO_printf(Perl_debug_log,
1084 "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld",
1085 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
1086 (long)PL_padix, (long)PL_padix_floor
1090 if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
1092 for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
1093 if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
1094 SvPADTMP_off(PL_curpad[po]);
1096 PL_padix = PL_padix_floor;
1099 PL_pad_reset_pending = FALSE;
1104 =for apidoc pad_tidy
1106 Tidy up a pad after we've finished compiling it:
1107 * remove most stuff from the pads of anonsub prototypes;
1109 * mark tmps as such.
1114 /* XXX DAPM surely most of this stuff should be done properly
1115 * at the right time beforehand, rather than going around afterwards
1116 * cleaning up our mistakes ???
1120 Perl_pad_tidy(pTHX_ padtidy_type type)
1124 ASSERT_CURPAD_ACTIVE("pad_tidy");
1126 /* If this CV has had any 'eval-capable' ops planted in it
1127 * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any
1128 * anon prototypes in the chain of CVs should be marked as cloneable,
1129 * so that for example the eval's CV in C<< sub { eval '$x' } >> gets
1130 * the right CvOUTSIDE.
1131 * If running with -d, *any* sub may potentially have an eval
1132 * excuted within it.
1135 if (PL_cv_has_eval || PL_perldb) {
1137 for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) {
1138 if (cv != PL_compcv && CvCOMPILED(cv))
1139 break; /* no need to mark already-compiled code */
1141 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1142 "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv)));
1148 /* extend curpad to match namepad */
1149 if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad))
1150 av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv);
1152 if (type == padtidy_SUBCLONE) {
1153 SV **namep = AvARRAY(PL_comppad_name);
1155 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1158 if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix]))
1161 * The only things that a clonable function needs in its
1162 * pad are anonymous subs.
1163 * The rest are created anew during cloning.
1165 if (!((namesv = namep[ix]) != Nullsv &&
1166 namesv != &PL_sv_undef &&
1167 *SvPVX(namesv) == '&'))
1169 SvREFCNT_dec(PL_curpad[ix]);
1170 PL_curpad[ix] = Nullsv;
1174 else if (type == padtidy_SUB) {
1175 /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */
1176 AV *av = newAV(); /* Will be @_ */
1178 av_store(PL_comppad, 0, (SV*)av);
1179 AvFLAGS(av) = AVf_REIFY;
1182 /* XXX DAPM rationalise these two similar branches */
1184 if (type == padtidy_SUB) {
1185 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1186 if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix]))
1188 if (!SvPADMY(PL_curpad[ix]))
1189 SvPADTMP_on(PL_curpad[ix]);
1192 else if (type == padtidy_FORMAT) {
1193 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1194 if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix]))
1195 SvPADTMP_on(PL_curpad[ix]);
1198 PL_curpad = AvARRAY(PL_comppad);
1203 =for apidoc pad_free
1205 Free the SV at offet po in the current pad.
1210 /* XXX DAPM integrate with pad_swipe ???? */
1212 Perl_pad_free(pTHX_ PADOFFSET po)
1214 ASSERT_CURPAD_LEGAL("pad_free");
1217 if (AvARRAY(PL_comppad) != PL_curpad)
1218 Perl_croak(aTHX_ "panic: pad_free curpad");
1220 Perl_croak(aTHX_ "panic: pad_free po");
1222 DEBUG_X(PerlIO_printf(Perl_debug_log,
1223 "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n",
1224 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)
1227 if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) {
1228 SvPADTMP_off(PL_curpad[po]);
1230 /* SV could be a shared hash key (eg bugid #19022) */
1232 #ifdef PERL_COPY_ON_WRITE
1233 !SvIsCOW(PL_curpad[po])
1235 !SvFAKE(PL_curpad[po])
1238 SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */
1241 if ((I32)po < PL_padix)
1248 =for apidoc do_dump_pad
1250 Dump the contents of a padlist
1256 Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full)
1267 pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE);
1268 pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE);
1269 pname = AvARRAY(pad_name);
1270 ppad = AvARRAY(pad);
1271 Perl_dump_indent(aTHX_ level, file,
1272 "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n",
1273 PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad)
1276 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
1277 const SV *namesv = pname[ix];
1278 if (namesv && namesv == &PL_sv_undef) {
1283 Perl_dump_indent(aTHX_ level+1, file,
1284 "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n",
1287 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
1289 (unsigned long)SvIVX(namesv),
1290 (unsigned long)SvNVX(namesv)
1294 Perl_dump_indent(aTHX_ level+1, file,
1295 "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n",
1298 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
1299 (long)U_32(SvNVX(namesv)),
1300 (long)SvIVX(namesv),
1305 Perl_dump_indent(aTHX_ level+1, file,
1306 "%2d. 0x%"UVxf"<%lu>\n",
1309 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0)
1320 dump the contents of a CV
1327 S_cv_dump(pTHX_ const CV *cv, const char *title)
1329 const CV *outside = CvOUTSIDE(cv);
1330 AV* padlist = CvPADLIST(cv);
1332 PerlIO_printf(Perl_debug_log,
1333 " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n",
1336 (CvANON(cv) ? "ANON"
1337 : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT"
1338 : (cv == PL_main_cv) ? "MAIN"
1339 : CvUNIQUE(cv) ? "UNIQUE"
1340 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
1343 : CvANON(outside) ? "ANON"
1344 : (outside == PL_main_cv) ? "MAIN"
1345 : CvUNIQUE(outside) ? "UNIQUE"
1346 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
1348 PerlIO_printf(Perl_debug_log,
1349 " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist));
1350 do_dump_pad(1, Perl_debug_log, padlist, 1);
1352 #endif /* DEBUGGING */
1359 =for apidoc cv_clone
1361 Clone a CV: make a new CV which points to the same code etc, but which
1362 has a newly-created pad built by copying the prototype pad and capturing
1369 Perl_cv_clone(pTHX_ CV *proto)
1372 AV* protopadlist = CvPADLIST(proto);
1373 const AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
1374 const AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
1375 SV** pname = AvARRAY(protopad_name);
1376 SV** ppad = AvARRAY(protopad);
1377 const I32 fname = AvFILLp(protopad_name);
1378 const I32 fpad = AvFILLp(protopad);
1385 assert(!CvUNIQUE(proto));
1387 /* Since cloneable anon subs can be nested, CvOUTSIDE may point
1388 * to a prototype; we instead want the cloned parent who called us.
1389 * Note that in general for formats, CvOUTSIDE != find_runcv */
1391 outside = CvOUTSIDE(proto);
1392 if (outside && CvCLONE(outside) && ! CvCLONED(outside))
1393 outside = find_runcv(NULL);
1394 depth = CvDEPTH(outside);
1395 assert(depth || SvTYPE(proto) == SVt_PVFM);
1398 assert(CvPADLIST(outside));
1401 SAVESPTR(PL_compcv);
1403 cv = PL_compcv = (CV*)NEWSV(1104, 0);
1404 sv_upgrade((SV *)cv, SvTYPE(proto));
1405 CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE);
1409 CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto)
1410 : savepv(CvFILE(proto));
1412 CvFILE(cv) = CvFILE(proto);
1414 CvGV(cv) = CvGV(proto);
1415 CvSTASH(cv) = CvSTASH(proto);
1417 CvROOT(cv) = OpREFCNT_inc(CvROOT(proto));
1419 CvSTART(cv) = CvSTART(proto);
1420 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
1421 CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto);
1424 sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto));
1426 CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE);
1428 av_fill(PL_comppad, fpad);
1429 for (ix = fname; ix >= 0; ix--)
1430 av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix]));
1432 PL_curpad = AvARRAY(PL_comppad);
1434 outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]);
1436 for (ix = fpad; ix > 0; ix--) {
1437 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
1439 if (namesv && namesv != &PL_sv_undef) { /* lexical */
1440 if (SvFAKE(namesv)) { /* lexical from outside? */
1441 sv = outpad[(I32)SvNVX(namesv)];
1443 /* formats may have an inactive parent */
1444 if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) {
1445 if (ckWARN(WARN_CLOSURE))
1446 Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
1447 "Variable \"%s\" is not available", SvPVX(namesv));
1451 assert(!SvPADSTALE(sv));
1452 sv = SvREFCNT_inc(sv);
1456 const char sigil = SvPVX(namesv)[0];
1458 sv = SvREFCNT_inc(ppad[ix]);
1459 else if (sigil == '@')
1461 else if (sigil == '%')
1468 else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) {
1469 sv = SvREFCNT_inc(ppad[ix]);
1479 PerlIO_printf(Perl_debug_log, "\nPad CV clone\n");
1480 cv_dump(outside, "Outside");
1481 cv_dump(proto, "Proto");
1488 /* Constant sub () { $x } closing over $x - see lib/constant.pm:
1489 * The prototype was marked as a candiate for const-ization,
1490 * so try to grab the current const value, and if successful,
1491 * turn into a const sub:
1493 SV* const_sv = op_const_sv(CvSTART(cv), cv);
1496 cv = newCONSTSUB(CvSTASH(proto), 0, const_sv);
1508 =for apidoc pad_fixup_inner_anons
1510 For any anon CVs in the pad, change CvOUTSIDE of that CV from
1511 old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be
1512 moved to a pre-existing CV struct.
1518 Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv)
1521 AV *comppad_name = (AV*)AvARRAY(padlist)[0];
1522 AV *comppad = (AV*)AvARRAY(padlist)[1];
1523 SV **namepad = AvARRAY(comppad_name);
1524 SV **curpad = AvARRAY(comppad);
1525 for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
1526 const SV *namesv = namepad[ix];
1527 if (namesv && namesv != &PL_sv_undef
1528 && *SvPVX(namesv) == '&')
1530 CV *innercv = (CV*)curpad[ix];
1531 assert(CvWEAKOUTSIDE(innercv));
1532 assert(CvOUTSIDE(innercv) == old_cv);
1533 CvOUTSIDE(innercv) = new_cv;
1540 =for apidoc pad_push
1542 Push a new pad frame onto the padlist, unless there's already a pad at
1543 this depth, in which case don't bother creating a new one. Then give
1544 the new pad an @_ in slot zero.
1550 Perl_pad_push(pTHX_ PADLIST *padlist, int depth)
1552 if (depth <= AvFILLp(padlist))
1556 SV** svp = AvARRAY(padlist);
1557 AV *newpad = newAV();
1558 SV **oldpad = AvARRAY(svp[depth-1]);
1559 I32 ix = AvFILLp((AV*)svp[1]);
1560 const I32 names_fill = AvFILLp((AV*)svp[0]);
1561 SV** names = AvARRAY(svp[0]);
1564 for ( ;ix > 0; ix--) {
1565 if (names_fill >= ix && names[ix] != &PL_sv_undef) {
1566 const char sigil = SvPVX(names[ix])[0];
1567 if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') {
1568 /* outer lexical or anon code */
1569 av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
1571 else { /* our own lexical */
1575 else if (sigil == '%')
1579 av_store(newpad, ix, sv);
1583 else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) {
1584 av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
1587 /* save temporaries on recursion? */
1588 SV *sv = NEWSV(0, 0);
1589 av_store(newpad, ix, sv);
1595 av_store(newpad, 0, (SV*)av);
1596 AvFLAGS(av) = AVf_REIFY;
1598 av_store(padlist, depth, (SV*)newpad);
1599 AvFILLp(padlist) = depth;