3 * Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
4 * by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
11 * 'Anyway: there was this Mr. Frodo left an orphan and stranded, as you
12 * might say, among those queer Bucklanders, being brought up anyhow in
13 * Brandy Hall. A regular warren, by all accounts. Old Master Gorbadoc
14 * never had fewer than a couple of hundred relations in the place.
15 * Mr. Bilbo never did a kinder deed than when he brought the lad back
16 * to live among decent folk.' --the Gaffer
18 * [p.23 of _The Lord of the Rings_, I/i: "A Long-Expected Party"]
22 * As of Sept 2002, this file is new and may be in a state of flux for
23 * a while. I've marked things I intent to come back and look at further
24 * with an 'XXX DAPM' comment.
28 =head1 Pad Data Structures
30 =for apidoc Amx|PADLIST *|CvPADLIST|CV *cv
32 CV's can have CvPADLIST(cv) set to point to an AV. This is the CV's
33 scratchpad, which stores lexical variables and opcode temporary and
36 For these purposes "forms" are a kind-of CV, eval""s are too (except they're
37 not callable at will and are always thrown away after the eval"" is done
38 executing). Require'd files are simply evals without any outer lexical
41 XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad,
42 but that is really the callers pad (a slot of which is allocated by
45 The CvPADLIST AV has the REFCNT of its component items managed "manually"
46 (mostly in pad.c) rather than by normal av.c rules. So we turn off AvREAL
47 just before freeing it, to let av.c know not to touch the entries.
48 The items in the AV are not SVs as for a normal AV, but other AVs:
50 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather
51 the "static type information" for lexicals.
53 The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that
54 depth of recursion into the CV.
55 The 0'th slot of a frame AV is an AV which is @_.
56 other entries are storage for variables and op targets.
58 Iterating over the names AV iterates over all possible pad
59 items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having
60 &PL_sv_undef "names" (see pad_alloc()).
62 Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names.
63 The rest are op targets/GVs/constants which are statically allocated
64 or resolved at compile time. These don't have names by which they
65 can be looked up from Perl code at run time through eval"" like
66 my/our variables can be. Since they can't be looked up by "name"
67 but only by their index allocated at compile time (which is usually
68 in PL_op->op_targ), wasting a name SV for them doesn't make sense.
70 The SVs in the names AV have their PV being the name of the variable.
71 xlow+1..xhigh inclusive in the NV union is a range of cop_seq numbers for
72 which the name is valid (accessed through the macros COP_SEQ_RANGE_LOW and
73 _HIGH). During compilation, these fields may hold the special value
74 PERL_PADSEQ_INTRO to indicate various stages:
76 COP_SEQ_RANGE_LOW _HIGH
77 ----------------- -----
78 PERL_PADSEQ_INTRO 0 variable not yet introduced: { my ($x
79 valid-seq# PERL_PADSEQ_INTRO variable in scope: { my ($x)
80 valid-seq# valid-seq# compilation of scope complete: { my ($x) }
82 For typed lexicals name SV is SVt_PVMG and SvSTASH
83 points at the type. For C<our> lexicals, the type is also SVt_PVMG, with the
84 SvOURSTASH slot pointing at the stash of the associated global (so that
85 duplicate C<our> declarations in the same package can be detected). SvUVX is
86 sometimes hijacked to store the generation number during compilation.
88 If SvFAKE is set on the name SV, then that slot in the frame AV is
89 a REFCNT'ed reference to a lexical from "outside". In this case,
90 the name SV does not use xlow and xhigh to store a cop_seq range, since it is
91 in scope throughout. Instead xhigh stores some flags containing info about
92 the real lexical (is it declared in an anon, and is it capable of being
93 instantiated multiple times?), and for fake ANONs, xlow contains the index
94 within the parent's pad where the lexical's value is stored, to make
97 If the 'name' is '&' the corresponding entry in frame AV
98 is a CV representing a possible closure.
99 (SvFAKE and name of '&' is not a meaningful combination currently but could
100 become so if C<my sub foo {}> is implemented.)
102 Note that formats are treated as anon subs, and are cloned each time
103 write is called (if necessary).
105 The flag SVs_PADSTALE is cleared on lexicals each time the my() is executed,
106 and set on scope exit. This allows the 'Variable $x is not available' warning
107 to be generated in evals, such as
109 { my $x = 1; sub f { eval '$x'} } f();
111 For state vars, SVs_PADSTALE is overloaded to mean 'not yet initialised'
113 =for apidoc AmxU|AV *|PL_comppad_name
115 During compilation, this points to the array containing the names part
116 of the pad for the currently-compiling code.
118 =for apidoc AmxU|AV *|PL_comppad
120 During compilation, this points to the array containing the values
121 part of the pad for the currently-compiling code. (At runtime a CV may
122 have many such value arrays; at compile time just one is constructed.)
123 At runtime, this points to the array containing the currently-relevant
124 values for the pad for the currently-executing code.
126 =for apidoc AmxU|SV **|PL_curpad
128 Points directly to the body of the L</PL_comppad> array.
129 (I.e., this is C<AvARRAY(PL_comppad)>.)
136 #define PERL_IN_PAD_C
138 #include "keywords.h"
140 #define COP_SEQ_RANGE_LOW_set(sv,val) \
141 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END
142 #define COP_SEQ_RANGE_HIGH_set(sv,val) \
143 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END
145 #define PARENT_PAD_INDEX_set(sv,val) \
146 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END
147 #define PARENT_FAKELEX_FLAGS_set(sv,val) \
148 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END
151 =for apidoc mx|void|pad_peg|const char *s
153 When PERL_MAD is enabled, this is a small no-op function that gets called
154 at the start of each pad-related function. It can be breakpointed to
155 track all pad operations. The parameter is a string indicating the type
156 of pad operation being performed.
162 void pad_peg(const char* s) {
163 static int pegcnt; /* XXX not threadsafe */
166 PERL_ARGS_ASSERT_PAD_PEG;
173 This is basically sv_eq_flags() in sv.c, but we avoid the magic
178 sv_eq_pvn_flags(pTHX_ const SV *sv, const char* pv, const STRLEN pvlen, const U32 flags) {
179 if ( (SvUTF8(sv) & SVf_UTF8 ) != (flags & SVf_UTF8) ) {
180 const char *pv1 = SvPVX_const(sv);
181 STRLEN cur1 = SvCUR(sv);
182 const char *pv2 = pv;
187 svrecode = newSVpvn(pv2, cur2);
188 sv_recode_to_utf8(svrecode, PL_encoding);
189 pv2 = SvPV_const(svrecode, cur2);
192 svrecode = newSVpvn(pv1, cur1);
193 sv_recode_to_utf8(svrecode, PL_encoding);
194 pv1 = SvPV_const(svrecode, cur1);
196 SvREFCNT_dec(svrecode);
198 if (flags & SVf_UTF8)
199 return (bytes_cmp_utf8(
200 (const U8*)pv1, cur1,
201 (const U8*)pv2, cur2) == 0);
203 return (bytes_cmp_utf8(
204 (const U8*)pv2, cur2,
205 (const U8*)pv1, cur1) == 0);
208 return ((SvPVX_const(sv) == pv)
209 || memEQ(SvPVX_const(sv), pv, pvlen));
214 =for apidoc Am|PADLIST *|pad_new|int flags
216 Create a new padlist, updating the global variables for the
217 currently-compiling padlist to point to the new padlist. The following
218 flags can be OR'ed together:
220 padnew_CLONE this pad is for a cloned CV
221 padnew_SAVE save old globals on the save stack
222 padnew_SAVESUB also save extra stuff for start of sub
228 Perl_pad_new(pTHX_ int flags)
231 AV *padlist, *padname, *pad;
234 ASSERT_CURPAD_LEGAL("pad_new");
236 /* XXX DAPM really need a new SAVEt_PAD which restores all or most
237 * vars (based on flags) rather than storing vals + addresses for
238 * each individually. Also see pad_block_start.
239 * XXX DAPM Try to see whether all these conditionals are required
242 /* save existing state, ... */
244 if (flags & padnew_SAVE) {
246 SAVESPTR(PL_comppad_name);
247 if (! (flags & padnew_CLONE)) {
249 SAVEI32(PL_comppad_name_fill);
250 SAVEI32(PL_min_intro_pending);
251 SAVEI32(PL_max_intro_pending);
252 SAVEBOOL(PL_cv_has_eval);
253 if (flags & padnew_SAVESUB) {
254 SAVEBOOL(PL_pad_reset_pending);
258 /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be
259 * saved - check at some pt that this is okay */
261 /* ... create new pad ... */
267 if (flags & padnew_CLONE) {
268 /* XXX DAPM I dont know why cv_clone needs it
269 * doing differently yet - perhaps this separate branch can be
270 * dispensed with eventually ???
273 AV * const a0 = newAV(); /* will be @_ */
274 av_store(pad, 0, MUTABLE_SV(a0));
278 av_store(pad, 0, NULL);
281 /* Most subroutines never recurse, hence only need 2 entries in the padlist
282 array - names, and depth=1. The default for av_store() is to allocate
283 0..3, and even an explicit call to av_extend() with <3 will be rounded
284 up, so we inline the allocation of the array here. */
286 AvFILLp(padlist) = 1;
288 AvALLOC(padlist) = ary;
289 AvARRAY(padlist) = ary;
290 ary[0] = MUTABLE_SV(padname);
291 ary[1] = MUTABLE_SV(pad);
293 /* ... then update state variables */
295 PL_comppad_name = padname;
297 PL_curpad = AvARRAY(pad);
299 if (! (flags & padnew_CLONE)) {
300 PL_comppad_name_fill = 0;
301 PL_min_intro_pending = 0;
306 DEBUG_X(PerlIO_printf(Perl_debug_log,
307 "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf
308 " name=0x%"UVxf" flags=0x%"UVxf"\n",
309 PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv),
310 PTR2UV(padname), (UV)flags
314 return (PADLIST*)padlist;
319 =head1 Embedding Functions
323 Clear out all the active components of a CV. This can happen either
324 by an explicit C<undef &foo>, or by the reference count going to zero.
325 In the former case, we keep the CvOUTSIDE pointer, so that any anonymous
326 children can still follow the full lexical scope chain.
332 Perl_cv_undef(pTHX_ CV *cv)
335 const PADLIST *padlist = CvPADLIST(cv);
337 PERL_ARGS_ASSERT_CV_UNDEF;
339 DEBUG_X(PerlIO_printf(Perl_debug_log,
340 "CV undef: cv=0x%"UVxf" comppad=0x%"UVxf"\n",
341 PTR2UV(cv), PTR2UV(PL_comppad))
344 if (CvFILE(cv) && CvDYNFILE(cv)) {
345 Safefree(CvFILE(cv));
349 if (!CvISXSUB(cv) && CvROOT(cv)) {
350 if (SvTYPE(cv) == SVt_PVCV && CvDEPTH(cv))
351 Perl_croak(aTHX_ "Can't undef active subroutine");
354 PAD_SAVE_SETNULLPAD();
361 SvPOK_off(MUTABLE_SV(cv)); /* forget prototype */
364 /* This statement and the subsequence if block was pad_undef(). */
365 pad_peg("pad_undef");
367 if (padlist && !SvIS_FREED(padlist) /* may be during global destruction */
371 /* Free the padlist associated with a CV.
372 If parts of it happen to be current, we null the relevant PL_*pad*
373 global vars so that we don't have any dangling references left.
374 We also repoint the CvOUTSIDE of any about-to-be-orphaned inner
375 subs to the outer of this cv. */
377 DEBUG_X(PerlIO_printf(Perl_debug_log,
378 "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf" comppad=0x%"UVxf"\n",
379 PTR2UV(cv), PTR2UV(padlist), PTR2UV(PL_comppad))
382 /* detach any '&' anon children in the pad; if afterwards they
383 * are still live, fix up their CvOUTSIDEs to point to our outside,
385 /* XXX DAPM for efficiency, we should only do this if we know we have
386 * children, or integrate this loop with general cleanup */
388 if (PL_phase != PERL_PHASE_DESTRUCT) { /* don't bother during global destruction */
389 CV * const outercv = CvOUTSIDE(cv);
390 const U32 seq = CvOUTSIDE_SEQ(cv);
391 AV * const comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]);
392 SV ** const namepad = AvARRAY(comppad_name);
393 AV * const comppad = MUTABLE_AV(AvARRAY(padlist)[1]);
394 SV ** const curpad = AvARRAY(comppad);
395 for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
396 SV * const namesv = namepad[ix];
397 if (namesv && namesv != &PL_sv_undef
398 && *SvPVX_const(namesv) == '&')
400 CV * const innercv = MUTABLE_CV(curpad[ix]);
401 U32 inner_rc = SvREFCNT(innercv);
404 SvREFCNT_dec(namesv);
406 if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */
408 SvREFCNT_dec(innercv);
412 /* in use, not just a prototype */
413 if (inner_rc && (CvOUTSIDE(innercv) == cv)) {
414 assert(CvWEAKOUTSIDE(innercv));
415 /* don't relink to grandfather if he's being freed */
416 if (outercv && SvREFCNT(outercv)) {
417 CvWEAKOUTSIDE_off(innercv);
418 CvOUTSIDE(innercv) = outercv;
419 CvOUTSIDE_SEQ(innercv) = seq;
420 SvREFCNT_inc_simple_void_NN(outercv);
423 CvOUTSIDE(innercv) = NULL;
430 ix = AvFILLp(padlist);
432 SV* const sv = AvARRAY(padlist)[ix--];
434 if (sv == (const SV *)PL_comppad) {
442 SV *const sv = AvARRAY(padlist)[0];
443 if (sv == (const SV *)PL_comppad_name)
444 PL_comppad_name = NULL;
447 AvREAL_off(CvPADLIST(cv));
448 SvREFCNT_dec(MUTABLE_SV(CvPADLIST(cv)));
449 CvPADLIST(cv) = NULL;
453 /* remove CvOUTSIDE unless this is an undef rather than a free */
454 if (!SvREFCNT(cv) && CvOUTSIDE(cv)) {
455 if (!CvWEAKOUTSIDE(cv))
456 SvREFCNT_dec(CvOUTSIDE(cv));
457 CvOUTSIDE(cv) = NULL;
460 SvREFCNT_dec(MUTABLE_SV(CvXSUBANY(cv).any_ptr));
463 if (CvISXSUB(cv) && CvXSUB(cv)) {
466 /* delete all flags except WEAKOUTSIDE and CVGV_RC, which indicate the
467 * ref status of CvOUTSIDE and CvGV, and ANON, which pp_entersub uses
468 * to choose an error message */
469 CvFLAGS(cv) &= (CVf_WEAKOUTSIDE|CVf_CVGV_RC|CVf_ANON);
473 =for apidoc m|PADOFFSET|pad_alloc_name|SV *namesv|U32 flags|HV *typestash|HV *ourstash
475 Allocates a place in the currently-compiling
476 pad (via L<perlapi/pad_alloc>) and
477 then stores a name for that entry. I<namesv> is adopted and becomes the
478 name entry; it must already contain the name string and be sufficiently
479 upgraded. I<typestash> and I<ourstash> and the C<padadd_STATE> flag get
480 added to I<namesv>. None of the other
481 processing of L<perlapi/pad_add_name_pvn>
482 is done. Returns the offset of the allocated pad slot.
488 S_pad_alloc_name(pTHX_ SV *namesv, U32 flags, HV *typestash, HV *ourstash)
491 const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY);
493 PERL_ARGS_ASSERT_PAD_ALLOC_NAME;
495 ASSERT_CURPAD_ACTIVE("pad_alloc_name");
498 assert(SvTYPE(namesv) == SVt_PVMG);
499 SvPAD_TYPED_on(namesv);
500 SvSTASH_set(namesv, MUTABLE_HV(SvREFCNT_inc_simple_NN(MUTABLE_SV(typestash))));
503 SvPAD_OUR_on(namesv);
504 SvOURSTASH_set(namesv, ourstash);
505 SvREFCNT_inc_simple_void_NN(ourstash);
507 else if (flags & padadd_STATE) {
508 SvPAD_STATE_on(namesv);
511 av_store(PL_comppad_name, offset, namesv);
516 =for apidoc Am|PADOFFSET|pad_add_name_pvn|const char *namepv|STRLEN namelen|U32 flags|HV *typestash|HV *ourstash
518 Allocates a place in the currently-compiling pad for a named lexical
519 variable. Stores the name and other metadata in the name part of the
520 pad, and makes preparations to manage the variable's lexical scoping.
521 Returns the offset of the allocated pad slot.
523 I<namepv>/I<namelen> specify the variable's name, including leading sigil.
524 If I<typestash> is non-null, the name is for a typed lexical, and this
525 identifies the type. If I<ourstash> is non-null, it's a lexical reference
526 to a package variable, and this identifies the package. The following
527 flags can be OR'ed together:
529 padadd_OUR redundantly specifies if it's a package var
530 padadd_STATE variable will retain value persistently
531 padadd_NO_DUP_CHECK skip check for lexical shadowing
537 Perl_pad_add_name_pvn(pTHX_ const char *namepv, STRLEN namelen,
538 U32 flags, HV *typestash, HV *ourstash)
545 PERL_ARGS_ASSERT_PAD_ADD_NAME_PVN;
547 if (flags & ~(padadd_OUR|padadd_STATE|padadd_NO_DUP_CHECK|padadd_UTF8_NAME))
548 Perl_croak(aTHX_ "panic: pad_add_name_pvn illegal flag bits 0x%" UVxf,
551 namesv = newSV_type((ourstash || typestash) ? SVt_PVMG : SVt_PVNV);
553 if ((is_utf8 = ((flags & padadd_UTF8_NAME) != 0))) {
554 namepv = (const char*)bytes_from_utf8((U8*)namepv, &namelen, &is_utf8);
557 sv_setpvn(namesv, namepv, namelen);
560 flags |= padadd_UTF8_NAME;
564 flags &= ~padadd_UTF8_NAME;
566 if ((flags & padadd_NO_DUP_CHECK) == 0) {
567 /* check for duplicate declaration */
568 pad_check_dup(namesv, flags & padadd_OUR, ourstash);
571 offset = pad_alloc_name(namesv, flags & ~padadd_UTF8_NAME, typestash, ourstash);
573 /* not yet introduced */
574 COP_SEQ_RANGE_LOW_set(namesv, PERL_PADSEQ_INTRO);
575 COP_SEQ_RANGE_HIGH_set(namesv, 0);
577 if (!PL_min_intro_pending)
578 PL_min_intro_pending = offset;
579 PL_max_intro_pending = offset;
580 /* if it's not a simple scalar, replace with an AV or HV */
581 assert(SvTYPE(PL_curpad[offset]) == SVt_NULL);
582 assert(SvREFCNT(PL_curpad[offset]) == 1);
583 if (namelen != 0 && *namepv == '@')
584 sv_upgrade(PL_curpad[offset], SVt_PVAV);
585 else if (namelen != 0 && *namepv == '%')
586 sv_upgrade(PL_curpad[offset], SVt_PVHV);
587 assert(SvPADMY(PL_curpad[offset]));
588 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
589 "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n",
590 (long)offset, SvPVX(namesv),
591 PTR2UV(PL_curpad[offset])));
597 =for apidoc Am|PADOFFSET|pad_add_name_pv|const char *name|U32 flags|HV *typestash|HV *ourstash
599 Exactly like L</pad_add_name_pvn>, but takes a nul-terminated string
600 instead of a string/length pair.
606 Perl_pad_add_name_pv(pTHX_ const char *name,
607 const U32 flags, HV *typestash, HV *ourstash)
609 PERL_ARGS_ASSERT_PAD_ADD_NAME_PV;
610 return pad_add_name_pvn(name, strlen(name), flags, typestash, ourstash);
614 =for apidoc Am|PADOFFSET|pad_add_name_sv|SV *name|U32 flags|HV *typestash|HV *ourstash
616 Exactly like L</pad_add_name_pvn>, but takes the name string in the form
617 of an SV instead of a string/length pair.
623 Perl_pad_add_name_sv(pTHX_ SV *name, U32 flags, HV *typestash, HV *ourstash)
627 PERL_ARGS_ASSERT_PAD_ADD_NAME_SV;
628 namepv = SvPV(name, namelen);
630 flags |= padadd_UTF8_NAME;
631 return pad_add_name_pvn(namepv, namelen, flags, typestash, ourstash);
635 =for apidoc Amx|PADOFFSET|pad_alloc|I32 optype|U32 tmptype
637 Allocates a place in the currently-compiling pad,
638 returning the offset of the allocated pad slot.
639 No name is initially attached to the pad slot.
640 I<tmptype> is a set of flags indicating the kind of pad entry required,
641 which will be set in the value SV for the allocated pad entry:
643 SVs_PADMY named lexical variable ("my", "our", "state")
644 SVs_PADTMP unnamed temporary store
646 I<optype> should be an opcode indicating the type of operation that the
647 pad entry is to support. This doesn't affect operational semantics,
648 but is used for debugging.
653 /* XXX DAPM integrate alloc(), add_name() and add_anon(),
654 * or at least rationalise ??? */
655 /* And flag whether the incoming name is UTF8 or 8 bit?
656 Could do this either with the +ve/-ve hack of the HV code, or expanding
657 the flag bits. Either way, this makes proper Unicode safe pad support.
662 Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
668 PERL_UNUSED_ARG(optype);
669 ASSERT_CURPAD_ACTIVE("pad_alloc");
671 if (AvARRAY(PL_comppad) != PL_curpad)
672 Perl_croak(aTHX_ "panic: pad_alloc");
673 if (PL_pad_reset_pending)
675 if (tmptype & SVs_PADMY) {
676 /* For a my, simply push a null SV onto the end of PL_comppad. */
677 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
678 retval = AvFILLp(PL_comppad);
681 /* For a tmp, scan the pad from PL_padix upwards
682 * for a slot which has no name and no active value.
684 SV * const * const names = AvARRAY(PL_comppad_name);
685 const SSize_t names_fill = AvFILLp(PL_comppad_name);
688 * "foreach" index vars temporarily become aliases to non-"my"
689 * values. Thus we must skip, not just pad values that are
690 * marked as current pad values, but also those with names.
692 /* HVDS why copy to sv here? we don't seem to use it */
693 if (++PL_padix <= names_fill &&
694 (sv = names[PL_padix]) && sv != &PL_sv_undef)
696 sv = *av_fetch(PL_comppad, PL_padix, TRUE);
697 if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) &&
698 !IS_PADGV(sv) && !IS_PADCONST(sv))
703 SvFLAGS(sv) |= tmptype;
704 PL_curpad = AvARRAY(PL_comppad);
706 DEBUG_X(PerlIO_printf(Perl_debug_log,
707 "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n",
708 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval,
709 PL_op_name[optype]));
710 #ifdef DEBUG_LEAKING_SCALARS
711 sv->sv_debug_optype = optype;
712 sv->sv_debug_inpad = 1;
714 return (PADOFFSET)retval;
718 =for apidoc Am|PADOFFSET|pad_add_anon|CV *func|I32 optype
720 Allocates a place in the currently-compiling pad (via L</pad_alloc>)
721 for an anonymous function that is lexically scoped inside the
722 currently-compiling function.
723 The function I<func> is linked into the pad, and its C<CvOUTSIDE> link
724 to the outer scope is weakened to avoid a reference loop.
726 I<optype> should be an opcode indicating the type of operation that the
727 pad entry is to support. This doesn't affect operational semantics,
728 but is used for debugging.
734 Perl_pad_add_anon(pTHX_ CV* func, I32 optype)
738 SV* const name = newSV_type(SVt_PVNV);
740 PERL_ARGS_ASSERT_PAD_ADD_ANON;
743 sv_setpvs(name, "&");
744 /* These two aren't used; just make sure they're not equal to
745 * PERL_PADSEQ_INTRO */
746 COP_SEQ_RANGE_LOW_set(name, 0);
747 COP_SEQ_RANGE_HIGH_set(name, 0);
748 ix = pad_alloc(optype, SVs_PADMY);
749 av_store(PL_comppad_name, ix, name);
750 /* XXX DAPM use PL_curpad[] ? */
751 av_store(PL_comppad, ix, (SV*)func);
752 SvPADMY_on((SV*)func);
754 /* to avoid ref loops, we never have parent + child referencing each
755 * other simultaneously */
756 if (CvOUTSIDE(func)) {
757 assert(!CvWEAKOUTSIDE(func));
758 CvWEAKOUTSIDE_on(func);
759 SvREFCNT_dec(CvOUTSIDE(func));
765 =for apidoc pad_check_dup
767 Check for duplicate declarations: report any of:
769 * a my in the current scope with the same name;
770 * an our (anywhere in the pad) with the same name and the
771 same stash as C<ourstash>
773 C<is_our> indicates that the name to check is an 'our' declaration.
779 S_pad_check_dup(pTHX_ SV *name, U32 flags, const HV *ourstash)
784 const U32 is_our = flags & padadd_OUR;
786 PERL_ARGS_ASSERT_PAD_CHECK_DUP;
788 ASSERT_CURPAD_ACTIVE("pad_check_dup");
790 assert((flags & ~padadd_OUR) == 0);
792 if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC))
793 return; /* nothing to check */
795 svp = AvARRAY(PL_comppad_name);
796 top = AvFILLp(PL_comppad_name);
797 /* check the current scope */
798 /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same
800 for (off = top; (I32)off > PL_comppad_name_floor; off--) {
801 SV * const sv = svp[off];
803 && sv != &PL_sv_undef
805 && ( COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO
806 || COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO)
809 if (is_our && (SvPAD_OUR(sv)))
810 break; /* "our" masking "our" */
811 Perl_warner(aTHX_ packWARN(WARN_MISC),
812 "\"%s\" variable %"SVf" masks earlier declaration in same %s",
813 (is_our ? "our" : PL_parser->in_my == KEY_my ? "my" : "state"),
815 (COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO
816 ? "scope" : "statement"));
821 /* check the rest of the pad */
824 SV * const sv = svp[off];
826 && sv != &PL_sv_undef
828 && ( COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO
829 || COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO)
830 && SvOURSTASH(sv) == ourstash
833 Perl_warner(aTHX_ packWARN(WARN_MISC),
834 "\"our\" variable %"SVf" redeclared", sv);
835 if ((I32)off <= PL_comppad_name_floor)
836 Perl_warner(aTHX_ packWARN(WARN_MISC),
837 "\t(Did you mean \"local\" instead of \"our\"?)\n");
847 =for apidoc Am|PADOFFSET|pad_findmy_pvn|const char *namepv|STRLEN namelen|U32 flags
849 Given the name of a lexical variable, find its position in the
850 currently-compiling pad.
851 I<namepv>/I<namelen> specify the variable's name, including leading sigil.
852 I<flags> is reserved and must be zero.
853 If it is not in the current pad but appears in the pad of any lexically
854 enclosing scope, then a pseudo-entry for it is added in the current pad.
855 Returns the offset in the current pad,
856 or C<NOT_IN_PAD> if no such lexical is in scope.
862 Perl_pad_findmy_pvn(pTHX_ const char *namepv, STRLEN namelen, U32 flags)
871 PERL_ARGS_ASSERT_PAD_FINDMY_PVN;
873 pad_peg("pad_findmy_pvn");
875 if (flags & ~padadd_UTF8_NAME)
876 Perl_croak(aTHX_ "panic: pad_findmy_pvn illegal flag bits 0x%" UVxf,
879 if (flags & padadd_UTF8_NAME) {
881 namepv = (const char*)bytes_from_utf8((U8*)namepv, &namelen, &is_utf8);
884 flags |= padadd_UTF8_NAME;
886 flags &= ~padadd_UTF8_NAME;
889 offset = pad_findlex(namepv, namelen, flags,
890 PL_compcv, PL_cop_seqmax, 1, NULL, &out_sv, &out_flags);
891 if ((PADOFFSET)offset != NOT_IN_PAD)
894 /* look for an our that's being introduced; this allows
895 * our $foo = 0 unless defined $foo;
896 * to not give a warning. (Yes, this is a hack) */
898 nameav = MUTABLE_AV(AvARRAY(CvPADLIST(PL_compcv))[0]);
899 name_svp = AvARRAY(nameav);
900 for (offset = AvFILLp(nameav); offset > 0; offset--) {
901 const SV * const namesv = name_svp[offset];
902 if (namesv && namesv != &PL_sv_undef
904 && (SvPAD_OUR(namesv))
905 && SvCUR(namesv) == namelen
906 && sv_eq_pvn_flags(aTHX_ namesv, namepv, namelen,
907 flags & padadd_UTF8_NAME ? SVf_UTF8 : 0 )
908 && COP_SEQ_RANGE_LOW(namesv) == PERL_PADSEQ_INTRO
916 =for apidoc Am|PADOFFSET|pad_findmy_pv|const char *name|U32 flags
918 Exactly like L</pad_findmy_pvn>, but takes a nul-terminated string
919 instead of a string/length pair.
925 Perl_pad_findmy_pv(pTHX_ const char *name, U32 flags)
927 PERL_ARGS_ASSERT_PAD_FINDMY_PV;
928 return pad_findmy_pvn(name, strlen(name), flags);
932 =for apidoc Am|PADOFFSET|pad_findmy_sv|SV *name|U32 flags
934 Exactly like L</pad_findmy_pvn>, but takes the name string in the form
935 of an SV instead of a string/length pair.
941 Perl_pad_findmy_sv(pTHX_ SV *name, U32 flags)
945 PERL_ARGS_ASSERT_PAD_FINDMY_SV;
946 namepv = SvPV(name, namelen);
948 flags |= padadd_UTF8_NAME;
949 return pad_findmy_pvn(namepv, namelen, flags);
953 =for apidoc Amp|PADOFFSET|find_rundefsvoffset
955 Find the position of the lexical C<$_> in the pad of the
956 currently-executing function. Returns the offset in the current pad,
957 or C<NOT_IN_PAD> if there is no lexical C<$_> in scope (in which case
958 the global one should be used instead).
959 L</find_rundefsv> is likely to be more convenient.
965 Perl_find_rundefsvoffset(pTHX)
970 return pad_findlex("$_", 2, 0, find_runcv(NULL), PL_curcop->cop_seq, 1,
971 NULL, &out_sv, &out_flags);
975 =for apidoc Am|SV *|find_rundefsv
977 Find and return the variable that is named C<$_> in the lexical scope
978 of the currently-executing function. This may be a lexical C<$_>,
979 or will otherwise be the global one.
985 Perl_find_rundefsv(pTHX)
991 po = pad_findlex("$_", 2, 0, find_runcv(NULL), PL_curcop->cop_seq, 1,
992 NULL, &namesv, &flags);
994 if (po == NOT_IN_PAD || SvPAD_OUR(namesv))
1001 Perl_find_rundefsv2(pTHX_ CV *cv, U32 seq)
1007 PERL_ARGS_ASSERT_FIND_RUNDEFSV2;
1009 po = pad_findlex("$_", 2, 0, cv, seq, 1,
1010 NULL, &namesv, &flags);
1012 if (po == NOT_IN_PAD || SvPAD_OUR(namesv))
1015 return AvARRAY((PAD*) (AvARRAY(CvPADLIST(cv))[CvDEPTH(cv)]))[po];
1019 =for apidoc m|PADOFFSET|pad_findlex|const char *namepv|STRLEN namelen|U32 flags|const CV* cv|U32 seq|int warn|SV** out_capture|SV** out_name_sv|int *out_flags
1021 Find a named lexical anywhere in a chain of nested pads. Add fake entries
1022 in the inner pads if it's found in an outer one.
1024 Returns the offset in the bottom pad of the lex or the fake lex.
1025 cv is the CV in which to start the search, and seq is the current cop_seq
1026 to match against. If warn is true, print appropriate warnings. The out_*
1027 vars return values, and so are pointers to where the returned values
1028 should be stored. out_capture, if non-null, requests that the innermost
1029 instance of the lexical is captured; out_name_sv is set to the innermost
1030 matched namesv or fake namesv; out_flags returns the flags normally
1031 associated with the IVX field of a fake namesv.
1033 Note that pad_findlex() is recursive; it recurses up the chain of CVs,
1034 then comes back down, adding fake entries as it goes. It has to be this way
1035 because fake namesvs in anon protoypes have to store in xlow the index into
1041 /* the CV has finished being compiled. This is not a sufficient test for
1042 * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */
1043 #define CvCOMPILED(cv) CvROOT(cv)
1045 /* the CV does late binding of its lexicals */
1046 #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM)
1050 S_pad_findlex(pTHX_ const char *namepv, STRLEN namelen, U32 flags, const CV* cv, U32 seq,
1051 int warn, SV** out_capture, SV** out_name_sv, int *out_flags)
1054 I32 offset, new_offset;
1057 const AV * const padlist = CvPADLIST(cv);
1059 PERL_ARGS_ASSERT_PAD_FINDLEX;
1061 if (flags & ~padadd_UTF8_NAME)
1062 Perl_croak(aTHX_ "panic: pad_findlex illegal flag bits 0x%" UVxf,
1067 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1068 "Pad findlex cv=0x%"UVxf" searching \"%.*s\" seq=%d%s\n",
1069 PTR2UV(cv), (int)namelen, namepv, (int)seq,
1070 out_capture ? " capturing" : "" ));
1072 /* first, search this pad */
1074 if (padlist) { /* not an undef CV */
1075 I32 fake_offset = 0;
1076 const AV * const nameav = MUTABLE_AV(AvARRAY(padlist)[0]);
1077 SV * const * const name_svp = AvARRAY(nameav);
1079 for (offset = AvFILLp(nameav); offset > 0; offset--) {
1080 const SV * const namesv = name_svp[offset];
1081 if (namesv && namesv != &PL_sv_undef
1082 && SvCUR(namesv) == namelen
1083 && sv_eq_pvn_flags(aTHX_ namesv, namepv, namelen,
1084 flags & padadd_UTF8_NAME ? SVf_UTF8 : 0))
1086 if (SvFAKE(namesv)) {
1087 fake_offset = offset; /* in case we don't find a real one */
1090 /* is seq within the range _LOW to _HIGH ?
1091 * This is complicated by the fact that PL_cop_seqmax
1092 * may have wrapped around at some point */
1093 if (COP_SEQ_RANGE_LOW(namesv) == PERL_PADSEQ_INTRO)
1094 continue; /* not yet introduced */
1096 if (COP_SEQ_RANGE_HIGH(namesv) == PERL_PADSEQ_INTRO) {
1097 /* in compiling scope */
1099 (seq > COP_SEQ_RANGE_LOW(namesv))
1100 ? (seq - COP_SEQ_RANGE_LOW(namesv) < (U32_MAX >> 1))
1101 : (COP_SEQ_RANGE_LOW(namesv) - seq > (U32_MAX >> 1))
1106 (COP_SEQ_RANGE_LOW(namesv) > COP_SEQ_RANGE_HIGH(namesv))
1108 ( seq > COP_SEQ_RANGE_LOW(namesv)
1109 || seq <= COP_SEQ_RANGE_HIGH(namesv))
1111 : ( seq > COP_SEQ_RANGE_LOW(namesv)
1112 && seq <= COP_SEQ_RANGE_HIGH(namesv))
1118 if (offset > 0 || fake_offset > 0 ) { /* a match! */
1119 if (offset > 0) { /* not fake */
1121 *out_name_sv = name_svp[offset]; /* return the namesv */
1123 /* set PAD_FAKELEX_MULTI if this lex can have multiple
1124 * instances. For now, we just test !CvUNIQUE(cv), but
1125 * ideally, we should detect my's declared within loops
1126 * etc - this would allow a wider range of 'not stayed
1127 * shared' warnings. We also treated already-compiled
1128 * lexes as not multi as viewed from evals. */
1130 *out_flags = CvANON(cv) ?
1132 (!CvUNIQUE(cv) && ! CvCOMPILED(cv))
1133 ? PAD_FAKELEX_MULTI : 0;
1135 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1136 "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%lu,%lu)\n",
1137 PTR2UV(cv), (long)offset,
1138 (unsigned long)COP_SEQ_RANGE_LOW(*out_name_sv),
1139 (unsigned long)COP_SEQ_RANGE_HIGH(*out_name_sv)));
1141 else { /* fake match */
1142 offset = fake_offset;
1143 *out_name_sv = name_svp[offset]; /* return the namesv */
1144 *out_flags = PARENT_FAKELEX_FLAGS(*out_name_sv);
1145 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1146 "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n",
1147 PTR2UV(cv), (long)offset, (unsigned long)*out_flags,
1148 (unsigned long) PARENT_PAD_INDEX(*out_name_sv)
1152 /* return the lex? */
1157 if (SvPAD_OUR(*out_name_sv)) {
1158 *out_capture = NULL;
1162 /* trying to capture from an anon prototype? */
1164 ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv)
1165 : *out_flags & PAD_FAKELEX_ANON)
1168 Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE),
1169 "Variable \"%"SVf"\" is not available",
1170 newSVpvn_flags(namepv, namelen,
1172 (flags & padadd_UTF8_NAME ? SVf_UTF8 : 0)));
1174 *out_capture = NULL;
1180 if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI)
1181 && !SvPAD_STATE(name_svp[offset])
1182 && warn && ckWARN(WARN_CLOSURE)) {
1184 Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
1185 "Variable \"%"SVf"\" will not stay shared",
1186 newSVpvn_flags(namepv, namelen,
1188 (flags & padadd_UTF8_NAME ? SVf_UTF8 : 0)));
1191 if (fake_offset && CvANON(cv)
1192 && CvCLONE(cv) &&!CvCLONED(cv))
1195 /* not yet caught - look further up */
1196 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1197 "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n",
1200 (void) pad_findlex(namepv, namelen, flags, CvOUTSIDE(cv),
1202 newwarn, out_capture, out_name_sv, out_flags);
1207 *out_capture = AvARRAY(MUTABLE_AV(AvARRAY(padlist)[
1208 CvDEPTH(cv) ? CvDEPTH(cv) : 1]))[offset];
1209 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1210 "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n",
1211 PTR2UV(cv), PTR2UV(*out_capture)));
1213 if (SvPADSTALE(*out_capture)
1214 && !SvPAD_STATE(name_svp[offset]))
1216 Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE),
1217 "Variable \"%"SVf"\" is not available",
1218 newSVpvn_flags(namepv, namelen,
1220 (flags & padadd_UTF8_NAME ? SVf_UTF8 : 0)));
1221 *out_capture = NULL;
1224 if (!*out_capture) {
1225 if (namelen != 0 && *namepv == '@')
1226 *out_capture = sv_2mortal(MUTABLE_SV(newAV()));
1227 else if (namelen != 0 && *namepv == '%')
1228 *out_capture = sv_2mortal(MUTABLE_SV(newHV()));
1230 *out_capture = sv_newmortal();
1238 /* it's not in this pad - try above */
1243 /* out_capture non-null means caller wants us to capture lex; in
1244 * addition we capture ourselves unless it's an ANON/format */
1245 new_capturep = out_capture ? out_capture :
1246 CvLATE(cv) ? NULL : &new_capture;
1248 offset = pad_findlex(namepv, namelen, flags, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1,
1249 new_capturep, out_name_sv, out_flags);
1250 if ((PADOFFSET)offset == NOT_IN_PAD)
1253 /* found in an outer CV. Add appropriate fake entry to this pad */
1255 /* don't add new fake entries (via eval) to CVs that we have already
1256 * finished compiling, or to undef CVs */
1257 if (CvCOMPILED(cv) || !padlist)
1258 return 0; /* this dummy (and invalid) value isnt used by the caller */
1261 /* This relies on sv_setsv_flags() upgrading the destination to the same
1262 type as the source, independent of the flags set, and on it being
1263 "good" and only copying flag bits and pointers that it understands.
1265 SV *new_namesv = newSVsv(*out_name_sv);
1266 AV * const ocomppad_name = PL_comppad_name;
1267 PAD * const ocomppad = PL_comppad;
1268 PL_comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]);
1269 PL_comppad = MUTABLE_AV(AvARRAY(padlist)[1]);
1270 PL_curpad = AvARRAY(PL_comppad);
1273 = pad_alloc_name(new_namesv,
1274 (SvPAD_STATE(*out_name_sv) ? padadd_STATE : 0),
1275 SvPAD_TYPED(*out_name_sv)
1276 ? SvSTASH(*out_name_sv) : NULL,
1277 SvOURSTASH(*out_name_sv)
1280 SvFAKE_on(new_namesv);
1281 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1282 "Pad addname: %ld \"%.*s\" FAKE\n",
1284 (int) SvCUR(new_namesv), SvPVX(new_namesv)));
1285 PARENT_FAKELEX_FLAGS_set(new_namesv, *out_flags);
1287 PARENT_PAD_INDEX_set(new_namesv, 0);
1288 if (SvPAD_OUR(new_namesv)) {
1289 NOOP; /* do nothing */
1291 else if (CvLATE(cv)) {
1292 /* delayed creation - just note the offset within parent pad */
1293 PARENT_PAD_INDEX_set(new_namesv, offset);
1297 /* immediate creation - capture outer value right now */
1298 av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep));
1299 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1300 "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n",
1301 PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset));
1303 *out_name_sv = new_namesv;
1304 *out_flags = PARENT_FAKELEX_FLAGS(new_namesv);
1306 PL_comppad_name = ocomppad_name;
1307 PL_comppad = ocomppad;
1308 PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL;
1316 =for apidoc Am|SV *|pad_sv|PADOFFSET po
1318 Get the value at offset I<po> in the current (compiling or executing) pad.
1319 Use macro PAD_SV instead of calling this function directly.
1325 Perl_pad_sv(pTHX_ PADOFFSET po)
1328 ASSERT_CURPAD_ACTIVE("pad_sv");
1331 Perl_croak(aTHX_ "panic: pad_sv po");
1332 DEBUG_X(PerlIO_printf(Perl_debug_log,
1333 "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n",
1334 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po]))
1336 return PL_curpad[po];
1340 =for apidoc Am|void|pad_setsv|PADOFFSET po|SV *sv
1342 Set the value at offset I<po> in the current (compiling or executing) pad.
1343 Use the macro PAD_SETSV() rather than calling this function directly.
1349 Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv)
1353 PERL_ARGS_ASSERT_PAD_SETSV;
1355 ASSERT_CURPAD_ACTIVE("pad_setsv");
1357 DEBUG_X(PerlIO_printf(Perl_debug_log,
1358 "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n",
1359 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv))
1364 #endif /* DEBUGGING */
1367 =for apidoc m|void|pad_block_start|int full
1369 Update the pad compilation state variables on entry to a new block
1374 /* XXX DAPM perhaps:
1375 * - integrate this in general state-saving routine ???
1376 * - combine with the state-saving going on in pad_new ???
1377 * - introduce a new SAVE type that does all this in one go ?
1381 Perl_pad_block_start(pTHX_ int full)
1384 ASSERT_CURPAD_ACTIVE("pad_block_start");
1385 SAVEI32(PL_comppad_name_floor);
1386 PL_comppad_name_floor = AvFILLp(PL_comppad_name);
1388 PL_comppad_name_fill = PL_comppad_name_floor;
1389 if (PL_comppad_name_floor < 0)
1390 PL_comppad_name_floor = 0;
1391 SAVEI32(PL_min_intro_pending);
1392 SAVEI32(PL_max_intro_pending);
1393 PL_min_intro_pending = 0;
1394 SAVEI32(PL_comppad_name_fill);
1395 SAVEI32(PL_padix_floor);
1396 PL_padix_floor = PL_padix;
1397 PL_pad_reset_pending = FALSE;
1401 =for apidoc m|U32|intro_my
1403 "Introduce" my variables to visible status.
1416 ASSERT_CURPAD_ACTIVE("intro_my");
1417 if (! PL_min_intro_pending)
1418 return PL_cop_seqmax;
1420 svp = AvARRAY(PL_comppad_name);
1421 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
1422 SV * const sv = svp[i];
1424 if (sv && sv != &PL_sv_undef && !SvFAKE(sv)
1425 && COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO)
1427 COP_SEQ_RANGE_HIGH_set(sv, PERL_PADSEQ_INTRO); /* Don't know scope end yet. */
1428 COP_SEQ_RANGE_LOW_set(sv, PL_cop_seqmax);
1429 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1430 "Pad intromy: %ld \"%s\", (%lu,%lu)\n",
1431 (long)i, SvPVX_const(sv),
1432 (unsigned long)COP_SEQ_RANGE_LOW(sv),
1433 (unsigned long)COP_SEQ_RANGE_HIGH(sv))
1437 seq = PL_cop_seqmax;
1439 if (PL_cop_seqmax == PERL_PADSEQ_INTRO) /* not a legal value */
1441 PL_min_intro_pending = 0;
1442 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
1443 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1444 "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax)));
1450 =for apidoc m|void|pad_leavemy
1452 Cleanup at end of scope during compilation: set the max seq number for
1453 lexicals in this scope and warn of any lexicals that never got introduced.
1459 Perl_pad_leavemy(pTHX)
1463 SV * const * const svp = AvARRAY(PL_comppad_name);
1465 PL_pad_reset_pending = FALSE;
1467 ASSERT_CURPAD_ACTIVE("pad_leavemy");
1468 if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) {
1469 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
1470 const SV * const sv = svp[off];
1471 if (sv && sv != &PL_sv_undef && !SvFAKE(sv))
1472 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
1473 "%"SVf" never introduced",
1477 /* "Deintroduce" my variables that are leaving with this scope. */
1478 for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) {
1479 const SV * const sv = svp[off];
1480 if (sv && sv != &PL_sv_undef && !SvFAKE(sv)
1481 && COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO)
1483 COP_SEQ_RANGE_HIGH_set(sv, PL_cop_seqmax);
1484 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1485 "Pad leavemy: %ld \"%s\", (%lu,%lu)\n",
1486 (long)off, SvPVX_const(sv),
1487 (unsigned long)COP_SEQ_RANGE_LOW(sv),
1488 (unsigned long)COP_SEQ_RANGE_HIGH(sv))
1493 if (PL_cop_seqmax == PERL_PADSEQ_INTRO) /* not a legal value */
1495 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1496 "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax));
1500 =for apidoc m|void|pad_swipe|PADOFFSET po|bool refadjust
1502 Abandon the tmp in the current pad at offset po and replace with a
1509 Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust)
1512 ASSERT_CURPAD_LEGAL("pad_swipe");
1515 if (AvARRAY(PL_comppad) != PL_curpad)
1516 Perl_croak(aTHX_ "panic: pad_swipe curpad");
1518 Perl_croak(aTHX_ "panic: pad_swipe po");
1520 DEBUG_X(PerlIO_printf(Perl_debug_log,
1521 "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n",
1522 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po));
1525 SvPADTMP_off(PL_curpad[po]);
1527 SvREFCNT_dec(PL_curpad[po]);
1530 /* if pad tmps aren't shared between ops, then there's no need to
1531 * create a new tmp when an existing op is freed */
1532 #ifdef USE_BROKEN_PAD_RESET
1533 PL_curpad[po] = newSV(0);
1534 SvPADTMP_on(PL_curpad[po]);
1536 PL_curpad[po] = &PL_sv_undef;
1538 if ((I32)po < PL_padix)
1543 =for apidoc m|void|pad_reset
1545 Mark all the current temporaries for reuse
1550 /* XXX pad_reset() is currently disabled because it results in serious bugs.
1551 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
1552 * on the stack by OPs that use them, there are several ways to get an alias
1553 * to a shared TARG. Such an alias will change randomly and unpredictably.
1554 * We avoid doing this until we can think of a Better Way.
1560 #ifdef USE_BROKEN_PAD_RESET
1561 if (AvARRAY(PL_comppad) != PL_curpad)
1562 Perl_croak(aTHX_ "panic: pad_reset curpad");
1564 DEBUG_X(PerlIO_printf(Perl_debug_log,
1565 "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld",
1566 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
1567 (long)PL_padix, (long)PL_padix_floor
1571 if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
1573 for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
1574 if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
1575 SvPADTMP_off(PL_curpad[po]);
1577 PL_padix = PL_padix_floor;
1580 PL_pad_reset_pending = FALSE;
1584 =for apidoc Amx|void|pad_tidy|padtidy_type type
1586 Tidy up a pad at the end of compilation of the code to which it belongs.
1587 Jobs performed here are: remove most stuff from the pads of anonsub
1588 prototypes; give it a @_; mark temporaries as such. I<type> indicates
1589 the kind of subroutine:
1591 padtidy_SUB ordinary subroutine
1592 padtidy_SUBCLONE prototype for lexical closure
1593 padtidy_FORMAT format
1598 /* XXX DAPM surely most of this stuff should be done properly
1599 * at the right time beforehand, rather than going around afterwards
1600 * cleaning up our mistakes ???
1604 Perl_pad_tidy(pTHX_ padtidy_type type)
1608 ASSERT_CURPAD_ACTIVE("pad_tidy");
1610 /* If this CV has had any 'eval-capable' ops planted in it
1611 * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any
1612 * anon prototypes in the chain of CVs should be marked as cloneable,
1613 * so that for example the eval's CV in C<< sub { eval '$x' } >> gets
1614 * the right CvOUTSIDE.
1615 * If running with -d, *any* sub may potentially have an eval
1616 * executed within it.
1619 if (PL_cv_has_eval || PL_perldb) {
1621 for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) {
1622 if (cv != PL_compcv && CvCOMPILED(cv))
1623 break; /* no need to mark already-compiled code */
1625 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1626 "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv)));
1632 /* extend curpad to match namepad */
1633 if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad))
1634 av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL);
1636 if (type == padtidy_SUBCLONE) {
1637 SV * const * const namep = AvARRAY(PL_comppad_name);
1640 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1643 if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix]))
1646 * The only things that a clonable function needs in its
1647 * pad are anonymous subs.
1648 * The rest are created anew during cloning.
1650 if (!((namesv = namep[ix]) != NULL &&
1651 namesv != &PL_sv_undef &&
1652 *SvPVX_const(namesv) == '&'))
1654 SvREFCNT_dec(PL_curpad[ix]);
1655 PL_curpad[ix] = NULL;
1659 else if (type == padtidy_SUB) {
1660 /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */
1661 AV * const av = newAV(); /* Will be @_ */
1662 av_store(PL_comppad, 0, MUTABLE_SV(av));
1666 if (type == padtidy_SUB || type == padtidy_FORMAT) {
1667 SV * const * const namep = AvARRAY(PL_comppad_name);
1669 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1670 if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix]))
1672 if (!SvPADMY(PL_curpad[ix])) {
1673 SvPADTMP_on(PL_curpad[ix]);
1674 } else if (!SvFAKE(namep[ix])) {
1675 /* This is a work around for how the current implementation of
1676 ?{ } blocks in regexps interacts with lexicals.
1678 One of our lexicals.
1679 Can't do this on all lexicals, otherwise sub baz() won't
1688 because completion of compiling &bar calling pad_tidy()
1689 would cause (top level) $foo to be marked as stale, and
1690 "no longer available". */
1691 SvPADSTALE_on(PL_curpad[ix]);
1695 PL_curpad = AvARRAY(PL_comppad);
1699 =for apidoc m|void|pad_free|PADOFFSET po
1701 Free the SV at offset po in the current pad.
1706 /* XXX DAPM integrate with pad_swipe ???? */
1708 Perl_pad_free(pTHX_ PADOFFSET po)
1711 ASSERT_CURPAD_LEGAL("pad_free");
1714 if (AvARRAY(PL_comppad) != PL_curpad)
1715 Perl_croak(aTHX_ "panic: pad_free curpad");
1717 Perl_croak(aTHX_ "panic: pad_free po");
1719 DEBUG_X(PerlIO_printf(Perl_debug_log,
1720 "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n",
1721 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)
1724 if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) {
1725 SvFLAGS(PL_curpad[po]) &= ~SVs_PADTMP; /* also clears SVs_PADSTALE */
1727 if ((I32)po < PL_padix)
1732 =for apidoc m|void|do_dump_pad|I32 level|PerlIO *file|PADLIST *padlist|int full
1734 Dump the contents of a padlist
1740 Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full)
1749 PERL_ARGS_ASSERT_DO_DUMP_PAD;
1754 pad_name = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 0, FALSE));
1755 pad = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 1, FALSE));
1756 pname = AvARRAY(pad_name);
1757 ppad = AvARRAY(pad);
1758 Perl_dump_indent(aTHX_ level, file,
1759 "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n",
1760 PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad)
1763 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
1764 const SV *namesv = pname[ix];
1765 if (namesv && namesv == &PL_sv_undef) {
1770 Perl_dump_indent(aTHX_ level+1, file,
1771 "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n",
1774 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
1775 SvPVX_const(namesv),
1776 (unsigned long)PARENT_FAKELEX_FLAGS(namesv),
1777 (unsigned long)PARENT_PAD_INDEX(namesv)
1781 Perl_dump_indent(aTHX_ level+1, file,
1782 "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n",
1785 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
1786 (unsigned long)COP_SEQ_RANGE_LOW(namesv),
1787 (unsigned long)COP_SEQ_RANGE_HIGH(namesv),
1792 Perl_dump_indent(aTHX_ level+1, file,
1793 "%2d. 0x%"UVxf"<%lu>\n",
1796 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0)
1805 =for apidoc m|void|cv_dump|CV *cv|const char *title
1807 dump the contents of a CV
1813 S_cv_dump(pTHX_ const CV *cv, const char *title)
1816 const CV * const outside = CvOUTSIDE(cv);
1817 AV* const padlist = CvPADLIST(cv);
1819 PERL_ARGS_ASSERT_CV_DUMP;
1821 PerlIO_printf(Perl_debug_log,
1822 " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n",
1825 (CvANON(cv) ? "ANON"
1826 : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT"
1827 : (cv == PL_main_cv) ? "MAIN"
1828 : CvUNIQUE(cv) ? "UNIQUE"
1829 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
1832 : CvANON(outside) ? "ANON"
1833 : (outside == PL_main_cv) ? "MAIN"
1834 : CvUNIQUE(outside) ? "UNIQUE"
1835 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
1837 PerlIO_printf(Perl_debug_log,
1838 " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist));
1839 do_dump_pad(1, Perl_debug_log, padlist, 1);
1842 #endif /* DEBUGGING */
1845 =for apidoc Am|CV *|cv_clone|CV *proto
1847 Clone a CV, making a lexical closure. I<proto> supplies the prototype
1848 of the function: its code, pad structure, and other attributes.
1849 The prototype is combined with a capture of outer lexicals to which the
1850 code refers, which are taken from the currently-executing instance of
1851 the immediately surrounding code.
1857 Perl_cv_clone(pTHX_ CV *proto)
1861 AV* const protopadlist = CvPADLIST(proto);
1862 const AV *const protopad_name = (const AV *)*av_fetch(protopadlist, 0, FALSE);
1863 const AV *const protopad = (const AV *)*av_fetch(protopadlist, 1, FALSE);
1864 SV** const pname = AvARRAY(protopad_name);
1865 SV** const ppad = AvARRAY(protopad);
1866 const I32 fname = AvFILLp(protopad_name);
1867 const I32 fpad = AvFILLp(protopad);
1873 PERL_ARGS_ASSERT_CV_CLONE;
1875 assert(!CvUNIQUE(proto));
1877 /* Since cloneable anon subs can be nested, CvOUTSIDE may point
1878 * to a prototype; we instead want the cloned parent who called us.
1879 * Note that in general for formats, CvOUTSIDE != find_runcv */
1881 outside = CvOUTSIDE(proto);
1882 if (outside && CvCLONE(outside) && ! CvCLONED(outside))
1883 outside = find_runcv(NULL);
1884 depth = CvDEPTH(outside);
1885 assert(depth || SvTYPE(proto) == SVt_PVFM);
1888 assert(CvPADLIST(outside));
1891 SAVESPTR(PL_compcv);
1893 cv = PL_compcv = MUTABLE_CV(newSV_type(SvTYPE(proto)));
1894 CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE|CVf_CVGV_RC);
1897 CvFILE(cv) = CvDYNFILE(proto) ? savepv(CvFILE(proto))
1899 CvGV_set(cv,CvGV(proto));
1900 CvSTASH_set(cv, CvSTASH(proto));
1902 CvROOT(cv) = OpREFCNT_inc(CvROOT(proto));
1904 CvSTART(cv) = CvSTART(proto);
1905 CvOUTSIDE(cv) = MUTABLE_CV(SvREFCNT_inc_simple(outside));
1906 CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto);
1909 sv_setpvn(MUTABLE_SV(cv), SvPVX_const(proto), SvCUR(proto));
1911 CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE);
1913 av_fill(PL_comppad, fpad);
1914 for (ix = fname; ix > 0; ix--)
1915 av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix]));
1917 PL_curpad = AvARRAY(PL_comppad);
1919 outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]);
1921 for (ix = fpad; ix > 0; ix--) {
1922 SV* const namesv = (ix <= fname) ? pname[ix] : NULL;
1924 if (namesv && namesv != &PL_sv_undef) { /* lexical */
1925 if (SvFAKE(namesv)) { /* lexical from outside? */
1926 sv = outpad[PARENT_PAD_INDEX(namesv)];
1928 /* formats may have an inactive parent,
1929 while my $x if $false can leave an active var marked as
1930 stale. And state vars are always available */
1931 if (SvPADSTALE(sv) && !SvPAD_STATE(namesv)) {
1932 Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE),
1933 "Variable \"%"SVf"\" is not available", namesv);
1937 SvREFCNT_inc_simple_void_NN(sv);
1940 const char sigil = SvPVX_const(namesv)[0];
1942 sv = SvREFCNT_inc(ppad[ix]);
1943 else if (sigil == '@')
1944 sv = MUTABLE_SV(newAV());
1945 else if (sigil == '%')
1946 sv = MUTABLE_SV(newHV());
1950 /* reset the 'assign only once' flag on each state var */
1951 if (SvPAD_STATE(namesv))
1955 else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) {
1956 sv = SvREFCNT_inc_NN(ppad[ix]);
1966 PerlIO_printf(Perl_debug_log, "\nPad CV clone\n");
1967 cv_dump(outside, "Outside");
1968 cv_dump(proto, "Proto");
1975 /* Constant sub () { $x } closing over $x - see lib/constant.pm:
1976 * The prototype was marked as a candiate for const-ization,
1977 * so try to grab the current const value, and if successful,
1978 * turn into a const sub:
1980 SV* const const_sv = op_const_sv(CvSTART(cv), cv);
1983 cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv);
1994 =for apidoc m|void|pad_fixup_inner_anons|PADLIST *padlist|CV *old_cv|CV *new_cv
1996 For any anon CVs in the pad, change CvOUTSIDE of that CV from
1997 old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be
1998 moved to a pre-existing CV struct.
2004 Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv)
2008 AV * const comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]);
2009 AV * const comppad = MUTABLE_AV(AvARRAY(padlist)[1]);
2010 SV ** const namepad = AvARRAY(comppad_name);
2011 SV ** const curpad = AvARRAY(comppad);
2013 PERL_ARGS_ASSERT_PAD_FIXUP_INNER_ANONS;
2014 PERL_UNUSED_ARG(old_cv);
2016 for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
2017 const SV * const namesv = namepad[ix];
2018 if (namesv && namesv != &PL_sv_undef
2019 && *SvPVX_const(namesv) == '&')
2021 CV * const innercv = MUTABLE_CV(curpad[ix]);
2022 assert(CvWEAKOUTSIDE(innercv));
2023 assert(CvOUTSIDE(innercv) == old_cv);
2024 CvOUTSIDE(innercv) = new_cv;
2030 =for apidoc m|void|pad_push|PADLIST *padlist|int depth
2032 Push a new pad frame onto the padlist, unless there's already a pad at
2033 this depth, in which case don't bother creating a new one. Then give
2034 the new pad an @_ in slot zero.
2040 Perl_pad_push(pTHX_ PADLIST *padlist, int depth)
2044 PERL_ARGS_ASSERT_PAD_PUSH;
2046 if (depth > AvFILLp(padlist)) {
2047 SV** const svp = AvARRAY(padlist);
2048 AV* const newpad = newAV();
2049 SV** const oldpad = AvARRAY(svp[depth-1]);
2050 I32 ix = AvFILLp((const AV *)svp[1]);
2051 const I32 names_fill = AvFILLp((const AV *)svp[0]);
2052 SV** const names = AvARRAY(svp[0]);
2055 for ( ;ix > 0; ix--) {
2056 if (names_fill >= ix && names[ix] != &PL_sv_undef) {
2057 const char sigil = SvPVX_const(names[ix])[0];
2058 if ((SvFLAGS(names[ix]) & SVf_FAKE)
2059 || (SvFLAGS(names[ix]) & SVpad_STATE)
2062 /* outer lexical or anon code */
2063 av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
2065 else { /* our own lexical */
2068 sv = MUTABLE_SV(newAV());
2069 else if (sigil == '%')
2070 sv = MUTABLE_SV(newHV());
2073 av_store(newpad, ix, sv);
2077 else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) {
2078 av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix]));
2081 /* save temporaries on recursion? */
2082 SV * const sv = newSV(0);
2083 av_store(newpad, ix, sv);
2088 av_store(newpad, 0, MUTABLE_SV(av));
2091 av_store(padlist, depth, MUTABLE_SV(newpad));
2092 AvFILLp(padlist) = depth;
2097 =for apidoc Am|HV *|pad_compname_type|PADOFFSET po
2099 Looks up the type of the lexical variable at position I<po> in the
2100 currently-compiling pad. If the variable is typed, the stash of the
2101 class to which it is typed is returned. If not, C<NULL> is returned.
2107 Perl_pad_compname_type(pTHX_ const PADOFFSET po)
2110 SV* const * const av = av_fetch(PL_comppad_name, po, FALSE);
2111 if ( SvPAD_TYPED(*av) ) {
2112 return SvSTASH(*av);
2117 #if defined(USE_ITHREADS)
2119 # define av_dup_inc(s,t) MUTABLE_AV(sv_dup_inc((const SV *)s,t))
2122 =for apidoc m|AV *|padlist_dup|AV *srcpad|CLONE_PARAMS *param
2130 Perl_padlist_dup(pTHX_ AV *srcpad, CLONE_PARAMS *param)
2133 PERL_ARGS_ASSERT_PADLIST_DUP;
2138 if (param->flags & CLONEf_COPY_STACKS
2139 || SvREFCNT(AvARRAY(srcpad)[1]) > 1) {
2140 dstpad = av_dup_inc(srcpad, param);
2141 assert (SvREFCNT(AvARRAY(srcpad)[1]) == 1);
2143 /* CvDEPTH() on our subroutine will be set to 0, so there's no need
2144 to build anything other than the first level of pads. */
2146 I32 ix = AvFILLp((const AV *)AvARRAY(srcpad)[1]);
2148 const I32 names_fill = AvFILLp((const AV *)(AvARRAY(srcpad)[0]));
2149 const AV *const srcpad1 = (const AV *) AvARRAY(srcpad)[1];
2150 SV **oldpad = AvARRAY(srcpad1);
2154 /* Look for it in the table first, as the padlist may have ended up
2155 as an element of @DB::args (or theoretically even @_), so it may
2156 may have been cloned already. It may also be there because of
2157 how Perl_sv_compile_2op() "works". :-( */
2158 dstpad = (AV*)ptr_table_fetch(PL_ptr_table, srcpad);
2161 return (AV *)SvREFCNT_inc_simple_NN(dstpad);
2164 ptr_table_store(PL_ptr_table, srcpad, dstpad);
2165 av_extend(dstpad, 1);
2166 AvARRAY(dstpad)[0] = MUTABLE_SV(av_dup_inc(AvARRAY(srcpad)[0], param));
2167 names = AvARRAY(AvARRAY(dstpad)[0]);
2171 av_extend(pad1, ix);
2172 AvARRAY(dstpad)[1] = MUTABLE_SV(pad1);
2173 pad1a = AvARRAY(pad1);
2174 AvFILLp(dstpad) = 1;
2179 for ( ;ix > 0; ix--) {
2182 } else if (names_fill >= ix && names[ix] != &PL_sv_undef) {
2183 const char sigil = SvPVX_const(names[ix])[0];
2184 if ((SvFLAGS(names[ix]) & SVf_FAKE)
2185 || (SvFLAGS(names[ix]) & SVpad_STATE)
2188 /* outer lexical or anon code */
2189 pad1a[ix] = sv_dup_inc(oldpad[ix], param);
2191 else { /* our own lexical */
2192 if(SvPADSTALE(oldpad[ix]) && SvREFCNT(oldpad[ix]) > 1) {
2193 /* This is a work around for how the current
2194 implementation of ?{ } blocks in regexps
2195 interacts with lexicals. */
2196 pad1a[ix] = sv_dup_inc(oldpad[ix], param);
2201 sv = MUTABLE_SV(newAV());
2202 else if (sigil == '%')
2203 sv = MUTABLE_SV(newHV());
2211 else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) {
2212 pad1a[ix] = sv_dup_inc(oldpad[ix], param);
2215 /* save temporaries on recursion? */
2216 SV * const sv = newSV(0);
2219 /* SvREFCNT(oldpad[ix]) != 1 for some code in threads.xs
2220 FIXTHAT before merging this branch.
2221 (And I know how to) */
2222 if (SvPADMY(oldpad[ix]))
2230 args = newAV(); /* Will be @_ */
2232 pad1a[0] = (SV *)args;
2240 #endif /* USE_ITHREADS */
2244 * c-indentation-style: bsd
2246 * indent-tabs-mode: t
2249 * ex: set ts=8 sts=4 sw=4 noet: