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);
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 * const namesv = namepad[ix];
259 if (namesv && namesv != &PL_sv_undef
260 && *SvPVX_const(namesv) == '&')
262 CV * const innercv = (CV*)curpad[ix];
263 U32 inner_rc = SvREFCNT(innercv);
265 namepad[ix] = Nullsv;
266 SvREFCNT_dec(namesv);
268 if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */
270 SvREFCNT_dec(innercv);
273 if (inner_rc /* in use, not just a prototype */
274 && CvOUTSIDE(innercv) == cv)
276 assert(CvWEAKOUTSIDE(innercv));
277 /* don't relink to grandfather if he's being freed */
278 if (outercv && SvREFCNT(outercv)) {
279 CvWEAKOUTSIDE_off(innercv);
280 CvOUTSIDE(innercv) = outercv;
281 CvOUTSIDE_SEQ(innercv) = seq;
282 (void)SvREFCNT_inc(outercv);
285 CvOUTSIDE(innercv) = Nullcv;
294 ix = AvFILLp(padlist);
296 SV* sv = AvARRAY(padlist)[ix--];
299 if (sv == (SV*)PL_comppad_name)
300 PL_comppad_name = Nullav;
301 else if (sv == (SV*)PL_comppad) {
302 PL_comppad = Null(PAD*);
303 PL_curpad = Null(SV**);
307 SvREFCNT_dec((SV*)CvPADLIST(cv));
308 CvPADLIST(cv) = Null(PADLIST*);
315 =for apidoc pad_add_name
317 Create a new name and associated PADMY SV in the current pad; return the
319 If C<typestash> is valid, the name is for a typed lexical; set the
320 name's stash to that value.
321 If C<ourstash> is valid, it's an our lexical, set the name's
322 GvSTASH to that value
324 If fake, it means we're cloning an existing entry
330 Perl_pad_add_name(pTHX_ const char *name, HV* typestash, HV* ourstash, bool fake)
332 const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY);
333 SV* namesv = NEWSV(1102, 0);
335 ASSERT_CURPAD_ACTIVE("pad_add_name");
338 sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV);
339 sv_setpv(namesv, name);
342 SvFLAGS(namesv) |= SVpad_TYPED;
343 SvSTASH_set(namesv, (HV*)SvREFCNT_inc((SV*) typestash));
346 SvFLAGS(namesv) |= SVpad_OUR;
347 GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash);
350 av_store(PL_comppad_name, offset, namesv);
353 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
354 "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name));
357 /* not yet introduced */
358 SvNV_set(namesv, (NV)PAD_MAX); /* min */
359 SvIV_set(namesv, 0); /* max */
361 if (!PL_min_intro_pending)
362 PL_min_intro_pending = offset;
363 PL_max_intro_pending = offset;
364 /* if it's not a simple scalar, replace with an AV or HV */
365 /* XXX DAPM since slot has been allocated, replace
366 * av_store with PL_curpad[offset] ? */
368 av_store(PL_comppad, offset, (SV*)newAV());
369 else if (*name == '%')
370 av_store(PL_comppad, offset, (SV*)newHV());
371 SvPADMY_on(PL_curpad[offset]);
372 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
373 "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n",
374 (long)offset, name, PTR2UV(PL_curpad[offset])));
384 =for apidoc pad_alloc
386 Allocate a new my or tmp pad entry. For a my, simply push a null SV onto
387 the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards
388 for a slot which has no name and and no active value.
393 /* XXX DAPM integrate alloc(), add_name() and add_anon(),
394 * or at least rationalise ??? */
398 Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
403 ASSERT_CURPAD_ACTIVE("pad_alloc");
405 if (AvARRAY(PL_comppad) != PL_curpad)
406 Perl_croak(aTHX_ "panic: pad_alloc");
407 if (PL_pad_reset_pending)
409 if (tmptype & SVs_PADMY) {
410 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
411 retval = AvFILLp(PL_comppad);
414 SV **names = AvARRAY(PL_comppad_name);
415 const SSize_t names_fill = AvFILLp(PL_comppad_name);
418 * "foreach" index vars temporarily become aliases to non-"my"
419 * values. Thus we must skip, not just pad values that are
420 * marked as current pad values, but also those with names.
422 /* HVDS why copy to sv here? we don't seem to use it */
423 if (++PL_padix <= names_fill &&
424 (sv = names[PL_padix]) && sv != &PL_sv_undef)
426 sv = *av_fetch(PL_comppad, PL_padix, TRUE);
427 if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) &&
428 !IS_PADGV(sv) && !IS_PADCONST(sv))
433 SvFLAGS(sv) |= tmptype;
434 PL_curpad = AvARRAY(PL_comppad);
436 DEBUG_X(PerlIO_printf(Perl_debug_log,
437 "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n",
438 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval,
439 PL_op_name[optype]));
440 #ifdef DEBUG_LEAKING_SCALARS
441 sv->sv_debug_optype = optype;
442 sv->sv_debug_inpad = 1;
444 return (PADOFFSET)retval;
448 =for apidoc pad_add_anon
450 Add an anon code entry to the current compiling pad
456 Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type)
461 name = NEWSV(1106, 0);
462 sv_upgrade(name, SVt_PVNV);
463 sv_setpvn(name, "&", 1);
466 ix = pad_alloc(op_type, SVs_PADMY);
467 av_store(PL_comppad_name, ix, name);
468 /* XXX DAPM use PL_curpad[] ? */
469 av_store(PL_comppad, ix, sv);
472 /* to avoid ref loops, we never have parent + child referencing each
473 * other simultaneously */
474 if (CvOUTSIDE((CV*)sv)) {
475 assert(!CvWEAKOUTSIDE((CV*)sv));
476 CvWEAKOUTSIDE_on((CV*)sv);
477 SvREFCNT_dec(CvOUTSIDE((CV*)sv));
485 =for apidoc pad_check_dup
487 Check for duplicate declarations: report any of:
488 * a my in the current scope with the same name;
489 * an our (anywhere in the pad) with the same name and the same stash
491 C<is_our> indicates that the name to check is an 'our' declaration
496 /* XXX DAPM integrate this into pad_add_name ??? */
499 Perl_pad_check_dup(pTHX_ const char *name, bool is_our, const HV *ourstash)
504 ASSERT_CURPAD_ACTIVE("pad_check_dup");
505 if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0)
506 return; /* nothing to check */
508 svp = AvARRAY(PL_comppad_name);
509 top = AvFILLp(PL_comppad_name);
510 /* check the current scope */
511 /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same
513 for (off = top; (I32)off > PL_comppad_name_floor; off--) {
515 && sv != &PL_sv_undef
517 && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
519 || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash))
520 && strEQ(name, SvPVX_const(sv)))
522 Perl_warner(aTHX_ packWARN(WARN_MISC),
523 "\"%s\" variable %s masks earlier declaration in same %s",
524 (is_our ? "our" : "my"),
526 (SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
531 /* check the rest of the pad */
535 && sv != &PL_sv_undef
537 && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
538 && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)
539 && strEQ(name, SvPVX_const(sv)))
541 Perl_warner(aTHX_ packWARN(WARN_MISC),
542 "\"our\" variable %s redeclared", name);
543 Perl_warner(aTHX_ packWARN(WARN_MISC),
544 "\t(Did you mean \"local\" instead of \"our\"?)\n");
547 } while ( off-- > 0 );
553 =for apidoc pad_findmy
555 Given a lexical name, try to find its offset, first in the current pad,
556 or failing that, in the pads of any lexically enclosing subs (including
557 the complications introduced by eval). If the name is found in an outer pad,
558 then a fake entry is added to the current pad.
559 Returns the offset in the current pad, or NOT_IN_PAD on failure.
565 Perl_pad_findmy(pTHX_ const char *name)
573 offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1,
574 Null(SV**), &out_sv, &out_flags);
575 if (offset != NOT_IN_PAD)
578 /* look for an our that's being introduced; this allows
579 * our $foo = 0 unless defined $foo;
580 * to not give a warning. (Yes, this is a hack) */
582 nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0];
583 name_svp = AvARRAY(nameav);
584 for (offset = AvFILLp(nameav); offset > 0; offset--) {
585 const SV *namesv = name_svp[offset];
586 if (namesv && namesv != &PL_sv_undef
588 && (SvFLAGS(namesv) & SVpad_OUR)
589 && strEQ(SvPVX_const(namesv), name)
590 && U_32(SvNVX(namesv)) == PAD_MAX /* min */
598 * Returns the offset of a lexical $_, if there is one, at run time.
599 * Used by the UNDERBAR XS macro.
603 Perl_find_rundefsvoffset(pTHX)
607 return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1,
608 Null(SV**), &out_sv, &out_flags);
612 =for apidoc pad_findlex
614 Find a named lexical anywhere in a chain of nested pads. Add fake entries
615 in the inner pads if it's found in an outer one.
617 Returns the offset in the bottom pad of the lex or the fake lex.
618 cv is the CV in which to start the search, and seq is the current cop_seq
619 to match against. If warn is true, print appropriate warnings. The out_*
620 vars return values, and so are pointers to where the returned values
621 should be stored. out_capture, if non-null, requests that the innermost
622 instance of the lexical is captured; out_name_sv is set to the innermost
623 matched namesv or fake namesv; out_flags returns the flags normally
624 associated with the IVX field of a fake namesv.
626 Note that pad_findlex() is recursive; it recurses up the chain of CVs,
627 then comes back down, adding fake entries as it goes. It has to be this way
628 because fake namesvs in anon protoypes have to store in NVX the index into
634 /* Flags set in the SvIVX field of FAKE namesvs */
636 #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */
637 #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */
639 /* the CV has finished being compiled. This is not a sufficient test for
640 * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */
641 #define CvCOMPILED(cv) CvROOT(cv)
643 /* the CV does late binding of its lexicals */
644 #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM)
648 S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn,
649 SV** out_capture, SV** out_name_sv, int *out_flags)
651 I32 offset, new_offset;
654 const AV *padlist = CvPADLIST(cv);
658 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
659 "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n",
660 PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" ));
662 /* first, search this pad */
664 if (padlist) { /* not an undef CV */
666 const AV *nameav = (AV*)AvARRAY(padlist)[0];
667 SV **name_svp = AvARRAY(nameav);
669 for (offset = AvFILLp(nameav); offset > 0; offset--) {
670 const SV *namesv = name_svp[offset];
671 if (namesv && namesv != &PL_sv_undef
672 && strEQ(SvPVX_const(namesv), name))
675 fake_offset = offset; /* in case we don't find a real one */
676 else if ( seq > U_32(SvNVX(namesv)) /* min */
677 && seq <= (U32)SvIVX(namesv)) /* max */
682 if (offset > 0 || fake_offset > 0 ) { /* a match! */
683 if (offset > 0) { /* not fake */
685 *out_name_sv = name_svp[offset]; /* return the namesv */
687 /* set PAD_FAKELEX_MULTI if this lex can have multiple
688 * instances. For now, we just test !CvUNIQUE(cv), but
689 * ideally, we should detect my's declared within loops
690 * etc - this would allow a wider range of 'not stayed
691 * shared' warnings. We also treated alreadly-compiled
692 * lexes as not multi as viewed from evals. */
694 *out_flags = CvANON(cv) ?
696 (!CvUNIQUE(cv) && ! CvCOMPILED(cv))
697 ? PAD_FAKELEX_MULTI : 0;
699 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
700 "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n",
701 PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)),
702 (long)SvIVX(*out_name_sv)));
704 else { /* fake match */
705 offset = fake_offset;
706 *out_name_sv = name_svp[offset]; /* return the namesv */
707 *out_flags = SvIVX(*out_name_sv);
708 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
709 "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n",
710 PTR2UV(cv), (long)offset, (unsigned long)*out_flags,
711 (unsigned long)SvNVX(*out_name_sv)
715 /* return the lex? */
720 if ((SvFLAGS(*out_name_sv) & SVpad_OUR)) {
721 *out_capture = Nullsv;
725 /* trying to capture from an anon prototype? */
727 ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv)
728 : *out_flags & PAD_FAKELEX_ANON)
730 if (warn && ckWARN(WARN_CLOSURE))
731 Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
732 "Variable \"%s\" is not available", name);
733 *out_capture = Nullsv;
739 if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI)
740 && warn && ckWARN(WARN_CLOSURE)) {
742 Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
743 "Variable \"%s\" will not stay shared", name);
746 if (fake_offset && CvANON(cv)
747 && CvCLONE(cv) &&!CvCLONED(cv))
750 /* not yet caught - look further up */
751 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
752 "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n",
755 pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv),
756 newwarn, out_capture, out_name_sv, out_flags);
761 *out_capture = AvARRAY((AV*)AvARRAY(padlist)[
762 CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset];
763 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
764 "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n",
765 PTR2UV(cv), PTR2UV(*out_capture)));
767 if (SvPADSTALE(*out_capture)) {
768 if (ckWARN(WARN_CLOSURE))
769 Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
770 "Variable \"%s\" is not available", name);
771 *out_capture = Nullsv;
776 *out_capture = sv_2mortal((SV*)newAV());
777 else if (*name == '%')
778 *out_capture = sv_2mortal((SV*)newHV());
780 *out_capture = sv_newmortal();
788 /* it's not in this pad - try above */
793 /* out_capture non-null means caller wants us to capture lex; in
794 * addition we capture ourselves unless it's an ANON/format */
795 new_capturep = out_capture ? out_capture :
796 CvLATE(cv) ? Null(SV**) : &new_capture;
798 offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1,
799 new_capturep, out_name_sv, out_flags);
800 if (offset == NOT_IN_PAD)
803 /* found in an outer CV. Add appropriate fake entry to this pad */
805 /* don't add new fake entries (via eval) to CVs that we have already
806 * finished compiling, or to undef CVs */
807 if (CvCOMPILED(cv) || !padlist)
808 return 0; /* this dummy (and invalid) value isnt used by the caller */
812 AV *ocomppad_name = PL_comppad_name;
813 PAD *ocomppad = PL_comppad;
814 PL_comppad_name = (AV*)AvARRAY(padlist)[0];
815 PL_comppad = (AV*)AvARRAY(padlist)[1];
816 PL_curpad = AvARRAY(PL_comppad);
818 new_offset = pad_add_name(
819 SvPVX_const(*out_name_sv),
820 (SvFLAGS(*out_name_sv) & SVpad_TYPED)
821 ? SvSTASH(*out_name_sv) : Nullhv,
822 (SvFLAGS(*out_name_sv) & SVpad_OUR)
823 ? GvSTASH(*out_name_sv) : Nullhv,
827 new_namesv = AvARRAY(PL_comppad_name)[new_offset];
828 SvIV_set(new_namesv, *out_flags);
830 SvNV_set(new_namesv, (NV)0);
831 if (SvFLAGS(new_namesv) & SVpad_OUR) {
834 else if (CvLATE(cv)) {
835 /* delayed creation - just note the offset within parent pad */
836 SvNV_set(new_namesv, (NV)offset);
840 /* immediate creation - capture outer value right now */
841 av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep));
842 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
843 "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n",
844 PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset));
846 *out_name_sv = new_namesv;
847 *out_flags = SvIVX(new_namesv);
849 PL_comppad_name = ocomppad_name;
850 PL_comppad = ocomppad;
851 PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **);
860 Get the value at offset po in the current pad.
861 Use macro PAD_SV instead of calling this function directly.
868 Perl_pad_sv(pTHX_ PADOFFSET po)
870 ASSERT_CURPAD_ACTIVE("pad_sv");
873 Perl_croak(aTHX_ "panic: pad_sv po");
874 DEBUG_X(PerlIO_printf(Perl_debug_log,
875 "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n",
876 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po]))
878 return PL_curpad[po];
883 =for apidoc pad_setsv
885 Set the entry at offset po in the current pad to sv.
886 Use the macro PAD_SETSV() rather than calling this function directly.
893 Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv)
895 ASSERT_CURPAD_ACTIVE("pad_setsv");
897 DEBUG_X(PerlIO_printf(Perl_debug_log,
898 "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n",
899 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv))
908 =for apidoc pad_block_start
910 Update the pad compilation state variables on entry to a new block
916 * - integrate this in general state-saving routine ???
917 * - combine with the state-saving going on in pad_new ???
918 * - introduce a new SAVE type that does all this in one go ?
922 Perl_pad_block_start(pTHX_ int full)
924 ASSERT_CURPAD_ACTIVE("pad_block_start");
925 SAVEI32(PL_comppad_name_floor);
926 PL_comppad_name_floor = AvFILLp(PL_comppad_name);
928 PL_comppad_name_fill = PL_comppad_name_floor;
929 if (PL_comppad_name_floor < 0)
930 PL_comppad_name_floor = 0;
931 SAVEI32(PL_min_intro_pending);
932 SAVEI32(PL_max_intro_pending);
933 PL_min_intro_pending = 0;
934 SAVEI32(PL_comppad_name_fill);
935 SAVEI32(PL_padix_floor);
936 PL_padix_floor = PL_padix;
937 PL_pad_reset_pending = FALSE;
944 "Introduce" my variables to visible status.
956 ASSERT_CURPAD_ACTIVE("intro_my");
957 if (! PL_min_intro_pending)
958 return PL_cop_seqmax;
960 svp = AvARRAY(PL_comppad_name);
961 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
962 if ((sv = svp[i]) && sv != &PL_sv_undef
963 && !SvFAKE(sv) && !SvIVX(sv))
965 SvIV_set(sv, PAD_MAX); /* Don't know scope end yet. */
966 SvNV_set(sv, (NV)PL_cop_seqmax);
967 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
968 "Pad intromy: %ld \"%s\", (%ld,%ld)\n",
969 (long)i, SvPVX_const(sv),
970 (long)U_32(SvNVX(sv)), (long)SvIVX(sv))
974 PL_min_intro_pending = 0;
975 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
976 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
977 "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1)));
979 return PL_cop_seqmax++;
983 =for apidoc pad_leavemy
985 Cleanup at end of scope during compilation: set the max seq number for
986 lexicals in this scope and warn of any lexicals that never got introduced.
992 Perl_pad_leavemy(pTHX)
995 SV **svp = AvARRAY(PL_comppad_name);
997 PL_pad_reset_pending = FALSE;
999 ASSERT_CURPAD_ACTIVE("pad_leavemy");
1000 if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) {
1001 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
1003 if ((sv = svp[off]) && sv != &PL_sv_undef
1004 && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL))
1005 Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
1006 "%"SVf" never introduced", sv);
1009 /* "Deintroduce" my variables that are leaving with this scope. */
1010 for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) {
1012 if ((sv = svp[off]) && sv != &PL_sv_undef
1013 && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX)
1015 SvIV_set(sv, PL_cop_seqmax);
1016 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1017 "Pad leavemy: %ld \"%s\", (%ld,%ld)\n",
1018 (long)off, SvPVX_const(sv),
1019 (long)U_32(SvNVX(sv)), (long)SvIVX(sv))
1024 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1025 "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax));
1030 =for apidoc pad_swipe
1032 Abandon the tmp in the current pad at offset po and replace with a
1039 Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust)
1041 ASSERT_CURPAD_LEGAL("pad_swipe");
1044 if (AvARRAY(PL_comppad) != PL_curpad)
1045 Perl_croak(aTHX_ "panic: pad_swipe curpad");
1047 Perl_croak(aTHX_ "panic: pad_swipe po");
1049 DEBUG_X(PerlIO_printf(Perl_debug_log,
1050 "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n",
1051 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po));
1054 SvPADTMP_off(PL_curpad[po]);
1056 SvREFCNT_dec(PL_curpad[po]);
1058 PL_curpad[po] = NEWSV(1107,0);
1059 SvPADTMP_on(PL_curpad[po]);
1060 if ((I32)po < PL_padix)
1066 =for apidoc pad_reset
1068 Mark all the current temporaries for reuse
1073 /* XXX pad_reset() is currently disabled because it results in serious bugs.
1074 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
1075 * on the stack by OPs that use them, there are several ways to get an alias
1076 * to a shared TARG. Such an alias will change randomly and unpredictably.
1077 * We avoid doing this until we can think of a Better Way.
1080 Perl_pad_reset(pTHX)
1082 #ifdef USE_BROKEN_PAD_RESET
1083 if (AvARRAY(PL_comppad) != PL_curpad)
1084 Perl_croak(aTHX_ "panic: pad_reset curpad");
1086 DEBUG_X(PerlIO_printf(Perl_debug_log,
1087 "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld",
1088 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
1089 (long)PL_padix, (long)PL_padix_floor
1093 if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
1095 for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
1096 if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
1097 SvPADTMP_off(PL_curpad[po]);
1099 PL_padix = PL_padix_floor;
1102 PL_pad_reset_pending = FALSE;
1107 =for apidoc pad_tidy
1109 Tidy up a pad after we've finished compiling it:
1110 * remove most stuff from the pads of anonsub prototypes;
1112 * mark tmps as such.
1117 /* XXX DAPM surely most of this stuff should be done properly
1118 * at the right time beforehand, rather than going around afterwards
1119 * cleaning up our mistakes ???
1123 Perl_pad_tidy(pTHX_ padtidy_type type)
1127 ASSERT_CURPAD_ACTIVE("pad_tidy");
1129 /* If this CV has had any 'eval-capable' ops planted in it
1130 * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any
1131 * anon prototypes in the chain of CVs should be marked as cloneable,
1132 * so that for example the eval's CV in C<< sub { eval '$x' } >> gets
1133 * the right CvOUTSIDE.
1134 * If running with -d, *any* sub may potentially have an eval
1135 * excuted within it.
1138 if (PL_cv_has_eval || PL_perldb) {
1140 for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) {
1141 if (cv != PL_compcv && CvCOMPILED(cv))
1142 break; /* no need to mark already-compiled code */
1144 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1145 "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv)));
1151 /* extend curpad to match namepad */
1152 if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad))
1153 av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv);
1155 if (type == padtidy_SUBCLONE) {
1156 SV **namep = AvARRAY(PL_comppad_name);
1159 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1162 if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix]))
1165 * The only things that a clonable function needs in its
1166 * pad are anonymous subs.
1167 * The rest are created anew during cloning.
1169 if (!((namesv = namep[ix]) != Nullsv &&
1170 namesv != &PL_sv_undef &&
1171 *SvPVX_const(namesv) == '&'))
1173 SvREFCNT_dec(PL_curpad[ix]);
1174 PL_curpad[ix] = Nullsv;
1178 else if (type == padtidy_SUB) {
1179 /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */
1180 AV *av = newAV(); /* Will be @_ */
1182 av_store(PL_comppad, 0, (SV*)av);
1186 /* XXX DAPM rationalise these two similar branches */
1188 if (type == padtidy_SUB) {
1190 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1191 if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix]))
1193 if (!SvPADMY(PL_curpad[ix]))
1194 SvPADTMP_on(PL_curpad[ix]);
1197 else if (type == padtidy_FORMAT) {
1199 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1200 if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix]))
1201 SvPADTMP_on(PL_curpad[ix]);
1204 PL_curpad = AvARRAY(PL_comppad);
1209 =for apidoc pad_free
1211 Free the SV at offet po in the current pad.
1216 /* XXX DAPM integrate with pad_swipe ???? */
1218 Perl_pad_free(pTHX_ PADOFFSET po)
1220 ASSERT_CURPAD_LEGAL("pad_free");
1223 if (AvARRAY(PL_comppad) != PL_curpad)
1224 Perl_croak(aTHX_ "panic: pad_free curpad");
1226 Perl_croak(aTHX_ "panic: pad_free po");
1228 DEBUG_X(PerlIO_printf(Perl_debug_log,
1229 "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n",
1230 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)
1233 if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) {
1234 SvPADTMP_off(PL_curpad[po]);
1236 /* SV could be a shared hash key (eg bugid #19022) */
1238 #ifdef PERL_OLD_COPY_ON_WRITE
1239 !SvIsCOW(PL_curpad[po])
1241 !SvFAKE(PL_curpad[po])
1244 SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */
1247 if ((I32)po < PL_padix)
1254 =for apidoc do_dump_pad
1256 Dump the contents of a padlist
1262 Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full)
1273 pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE);
1274 pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE);
1275 pname = AvARRAY(pad_name);
1276 ppad = AvARRAY(pad);
1277 Perl_dump_indent(aTHX_ level, file,
1278 "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n",
1279 PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad)
1282 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
1283 const SV *namesv = pname[ix];
1284 if (namesv && namesv == &PL_sv_undef) {
1289 Perl_dump_indent(aTHX_ level+1, file,
1290 "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n",
1293 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
1294 SvPVX_const(namesv),
1295 (unsigned long)SvIVX(namesv),
1296 (unsigned long)SvNVX(namesv)
1300 Perl_dump_indent(aTHX_ level+1, file,
1301 "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n",
1304 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
1305 (long)U_32(SvNVX(namesv)),
1306 (long)SvIVX(namesv),
1311 Perl_dump_indent(aTHX_ level+1, file,
1312 "%2d. 0x%"UVxf"<%lu>\n",
1315 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0)
1326 dump the contents of a CV
1333 S_cv_dump(pTHX_ const CV *cv, const char *title)
1335 const CV *outside = CvOUTSIDE(cv);
1336 AV* padlist = CvPADLIST(cv);
1338 PerlIO_printf(Perl_debug_log,
1339 " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n",
1342 (CvANON(cv) ? "ANON"
1343 : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT"
1344 : (cv == PL_main_cv) ? "MAIN"
1345 : CvUNIQUE(cv) ? "UNIQUE"
1346 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
1349 : CvANON(outside) ? "ANON"
1350 : (outside == PL_main_cv) ? "MAIN"
1351 : CvUNIQUE(outside) ? "UNIQUE"
1352 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
1354 PerlIO_printf(Perl_debug_log,
1355 " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist));
1356 do_dump_pad(1, Perl_debug_log, padlist, 1);
1358 #endif /* DEBUGGING */
1365 =for apidoc cv_clone
1367 Clone a CV: make a new CV which points to the same code etc, but which
1368 has a newly-created pad built by copying the prototype pad and capturing
1375 Perl_cv_clone(pTHX_ CV *proto)
1379 AV* protopadlist = CvPADLIST(proto);
1380 const AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE);
1381 const AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE);
1382 SV** pname = AvARRAY(protopad_name);
1383 SV** ppad = AvARRAY(protopad);
1384 const I32 fname = AvFILLp(protopad_name);
1385 const I32 fpad = AvFILLp(protopad);
1391 assert(!CvUNIQUE(proto));
1393 /* Since cloneable anon subs can be nested, CvOUTSIDE may point
1394 * to a prototype; we instead want the cloned parent who called us.
1395 * Note that in general for formats, CvOUTSIDE != find_runcv */
1397 outside = CvOUTSIDE(proto);
1398 if (outside && CvCLONE(outside) && ! CvCLONED(outside))
1399 outside = find_runcv(NULL);
1400 depth = CvDEPTH(outside);
1401 assert(depth || SvTYPE(proto) == SVt_PVFM);
1404 assert(CvPADLIST(outside));
1407 SAVESPTR(PL_compcv);
1409 cv = PL_compcv = (CV*)NEWSV(1104, 0);
1410 sv_upgrade((SV *)cv, SvTYPE(proto));
1411 CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE);
1415 CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto)
1416 : savepv(CvFILE(proto));
1418 CvFILE(cv) = CvFILE(proto);
1420 CvGV(cv) = CvGV(proto);
1421 CvSTASH(cv) = CvSTASH(proto);
1423 CvROOT(cv) = OpREFCNT_inc(CvROOT(proto));
1425 CvSTART(cv) = CvSTART(proto);
1426 CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside);
1427 CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto);
1430 sv_setpvn((SV*)cv, SvPVX_const(proto), SvCUR(proto));
1432 CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE);
1434 av_fill(PL_comppad, fpad);
1435 for (ix = fname; ix >= 0; ix--)
1436 av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix]));
1438 PL_curpad = AvARRAY(PL_comppad);
1440 outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]);
1442 for (ix = fpad; ix > 0; ix--) {
1443 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
1445 if (namesv && namesv != &PL_sv_undef) { /* lexical */
1446 if (SvFAKE(namesv)) { /* lexical from outside? */
1447 sv = outpad[(I32)SvNVX(namesv)];
1449 /* formats may have an inactive parent */
1450 if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) {
1451 if (ckWARN(WARN_CLOSURE))
1452 Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
1453 "Variable \"%s\" is not available", SvPVX_const(namesv));
1457 assert(!SvPADSTALE(sv));
1458 sv = SvREFCNT_inc(sv);
1462 const char sigil = SvPVX_const(namesv)[0];
1464 sv = SvREFCNT_inc(ppad[ix]);
1465 else if (sigil == '@')
1467 else if (sigil == '%')
1474 else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) {
1475 sv = SvREFCNT_inc(ppad[ix]);
1485 PerlIO_printf(Perl_debug_log, "\nPad CV clone\n");
1486 cv_dump(outside, "Outside");
1487 cv_dump(proto, "Proto");
1494 /* Constant sub () { $x } closing over $x - see lib/constant.pm:
1495 * The prototype was marked as a candiate for const-ization,
1496 * so try to grab the current const value, and if successful,
1497 * turn into a const sub:
1499 SV* const_sv = op_const_sv(CvSTART(cv), cv);
1502 cv = newCONSTSUB(CvSTASH(proto), 0, const_sv);
1514 =for apidoc pad_fixup_inner_anons
1516 For any anon CVs in the pad, change CvOUTSIDE of that CV from
1517 old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be
1518 moved to a pre-existing CV struct.
1524 Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv)
1527 AV * const comppad_name = (AV*)AvARRAY(padlist)[0];
1528 AV * const comppad = (AV*)AvARRAY(padlist)[1];
1529 SV **namepad = AvARRAY(comppad_name);
1530 SV **curpad = AvARRAY(comppad);
1531 for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
1532 const SV *namesv = namepad[ix];
1533 if (namesv && namesv != &PL_sv_undef
1534 && *SvPVX_const(namesv) == '&')
1536 CV *innercv = (CV*)curpad[ix];
1537 assert(CvWEAKOUTSIDE(innercv));
1538 assert(CvOUTSIDE(innercv) == old_cv);
1539 CvOUTSIDE(innercv) = new_cv;
1546 =for apidoc pad_push
1548 Push a new pad frame onto the padlist, unless there's already a pad at
1549 this depth, in which case don't bother creating a new one. Then give
1550 the new pad an @_ in slot zero.
1556 Perl_pad_push(pTHX_ PADLIST *padlist, int depth)
1558 if (depth <= AvFILLp(padlist))
1562 SV** svp = AvARRAY(padlist);
1563 AV *newpad = newAV();
1564 SV **oldpad = AvARRAY(svp[depth-1]);
1565 I32 ix = AvFILLp((AV*)svp[1]);
1566 const I32 names_fill = AvFILLp((AV*)svp[0]);
1567 SV** names = AvARRAY(svp[0]);
1570 for ( ;ix > 0; ix--) {
1571 if (names_fill >= ix && names[ix] != &PL_sv_undef) {
1572 const char sigil = SvPVX_const(names[ix])[0];
1573 if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') {
1574 /* outer lexical or anon code */
1575 av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
1577 else { /* our own lexical */
1581 else if (sigil == '%')
1585 av_store(newpad, ix, sv);
1589 else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) {
1590 av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
1593 /* save temporaries on recursion? */
1594 SV *sv = NEWSV(0, 0);
1595 av_store(newpad, ix, sv);
1601 av_store(newpad, 0, (SV*)av);
1604 av_store(padlist, depth, (SV*)newpad);
1605 AvFILLp(padlist) = depth;
1611 Perl_pad_compname_type(pTHX_ const PADOFFSET po)
1613 SV** const av = av_fetch(PL_comppad_name, po, FALSE);
1614 if ( SvFLAGS(*av) & SVpad_TYPED ) {
1615 return SvSTASH(*av);
1622 * c-indentation-style: bsd
1624 * indent-tabs-mode: t
1627 * ex: set ts=8 sts=4 sw=4 noet: