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pad.c:pad_alloc: Remove redundant IS_PADGV
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1/* pad.c
2 *
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3 * Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
4 * by Larry Wall and others
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5 *
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.
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8 */
9
10/*
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
dd2155a4 17 *
4ac71550 18 * [p.23 of _The Lord of the Rings_, I/i: "A Long-Expected Party"]
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19 */
20
21/* XXX DAPM
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.
25 */
26
27/*
28=head1 Pad Data Structures
29
cc76b5cc 30=for apidoc Amx|PADLIST *|CvPADLIST|CV *cv
166f8a29 31
58a9b2fe 32CV's can have CvPADLIST(cv) set to point to a PADLIST. This is the CV's
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33scratchpad, which stores lexical variables and opcode temporary and
34per-thread values.
dd2155a4 35
58a9b2fe 36For these purposes "formats" are a kind-of CV; eval""s are too (except they're
dd2155a4 37not callable at will and are always thrown away after the eval"" is done
58a9b2fe 38executing). Require'd files are simply evals without any outer lexical
b5c19bd7 39scope.
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40
41XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad,
42but that is really the callers pad (a slot of which is allocated by
43every entersub).
44
58a9b2fe 45The PADLIST has a C array where pads are stored.
dd2155a4 46
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47The 0th entry of the PADLIST is a PADNAMELIST (which is actually just an
48AV, but that may change) which represents the "names" or rather
49the "static type information" for lexicals. The individual elements of a
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50PADNAMELIST are PADNAMEs (just SVs; but, again, that may change). Future
51refactorings might stop the PADNAMELIST from being stored in the PADLIST's
86d2498c 52array, so don't rely on it. See L</PadlistNAMES>.
dd2155a4 53
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54The CvDEPTH'th entry of a PADLIST is a PAD (an AV) which is the stack frame
55at that depth of recursion into the CV. The 0th slot of a frame AV is an
56AV which is @_. Other entries are storage for variables and op targets.
dd2155a4 57
58a9b2fe 58Iterating over the PADNAMELIST iterates over all possible pad
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59items. Pad slots for targets (SVs_PADTMP)
60and GVs end up having &PL_sv_undef
325e1816 61"names", while slots for constants have &PL_sv_no "names" (see
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62pad_alloc()). That &PL_sv_no is used is an implementation detail subject
63to change. To test for it, use C<PadnamePV(name) && !PadnameLEN(name)>.
dd2155a4 64
58a9b2fe 65Only my/our variable (SvPADMY/PADNAME_isOUR) slots get valid names.
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66The rest are op targets/GVs/constants which are statically allocated
67or resolved at compile time. These don't have names by which they
58a9b2fe 68can be looked up from Perl code at run time through eval"" the way
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69my/our variables can be. Since they can't be looked up by "name"
70but only by their index allocated at compile time (which is usually
71in PL_op->op_targ), wasting a name SV for them doesn't make sense.
72
73The SVs in the names AV have their PV being the name of the variable.
3441fb63 74xlow+1..xhigh inclusive in the NV union is a range of cop_seq numbers for
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75which the name is valid (accessed through the macros COP_SEQ_RANGE_LOW and
76_HIGH). During compilation, these fields may hold the special value
77PERL_PADSEQ_INTRO to indicate various stages:
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78
79 COP_SEQ_RANGE_LOW _HIGH
80 ----------------- -----
81 PERL_PADSEQ_INTRO 0 variable not yet introduced: { my ($x
82 valid-seq# PERL_PADSEQ_INTRO variable in scope: { my ($x)
83 valid-seq# valid-seq# compilation of scope complete: { my ($x) }
84
85For typed lexicals name SV is SVt_PVMG and SvSTASH
3441fb63 86points at the type. For C<our> lexicals, the type is also SVt_PVMG, with the
73d95100 87SvOURSTASH slot pointing at the stash of the associated global (so that
931b58fb 88duplicate C<our> declarations in the same package can be detected). SvUVX is
3441fb63 89sometimes hijacked to store the generation number during compilation.
dd2155a4 90
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91If PADNAME_OUTER (SvFAKE) is set on the
92name SV, then that slot in the frame AV is
72d33970 93a REFCNT'ed reference to a lexical from "outside". In this case,
3441fb63 94the name SV does not use xlow and xhigh to store a cop_seq range, since it is
72d33970 95in scope throughout. Instead xhigh stores some flags containing info about
b5c19bd7 96the real lexical (is it declared in an anon, and is it capable of being
3441fb63 97instantiated multiple times?), and for fake ANONs, xlow contains the index
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98within the parent's pad where the lexical's value is stored, to make
99cloning quicker.
dd2155a4 100
58a9b2fe 101If the 'name' is '&' the corresponding entry in the PAD
dd2155a4 102is a CV representing a possible closure.
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103(PADNAME_OUTER and name of '&' is not a
104meaningful combination currently but could
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105become so if C<my sub foo {}> is implemented.)
106
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107Note that formats are treated as anon subs, and are cloned each time
108write is called (if necessary).
109
ab8e66c1 110The flag SVs_PADSTALE is cleared on lexicals each time the my() is executed,
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111and set on scope exit. This allows the
112'Variable $x is not available' warning
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113to be generated in evals, such as
114
115 { my $x = 1; sub f { eval '$x'} } f();
116
58a9b2fe 117For state vars, SVs_PADSTALE is overloaded to mean 'not yet initialised'.
d1186544 118
36c300bb 119=for apidoc AmxU|PADNAMELIST *|PL_comppad_name
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120
121During compilation, this points to the array containing the names part
122of the pad for the currently-compiling code.
123
36c300bb 124=for apidoc AmxU|PAD *|PL_comppad
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125
126During compilation, this points to the array containing the values
127part of the pad for the currently-compiling code. (At runtime a CV may
128have many such value arrays; at compile time just one is constructed.)
129At runtime, this points to the array containing the currently-relevant
130values for the pad for the currently-executing code.
131
132=for apidoc AmxU|SV **|PL_curpad
133
134Points directly to the body of the L</PL_comppad> array.
c14a2249 135(I.e., this is C<PAD_ARRAY(PL_comppad)>.)
cc76b5cc 136
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137=cut
138*/
139
140
141#include "EXTERN.h"
142#define PERL_IN_PAD_C
143#include "perl.h"
952306ac 144#include "keywords.h"
dd2155a4 145
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146#define COP_SEQ_RANGE_LOW_set(sv,val) \
147 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END
148#define COP_SEQ_RANGE_HIGH_set(sv,val) \
149 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END
809abb02 150
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151#define PARENT_PAD_INDEX_set(sv,val) \
152 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END
153#define PARENT_FAKELEX_FLAGS_set(sv,val) \
154 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END
dd2155a4 155
cc76b5cc 156/*
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157This is basically sv_eq_flags() in sv.c, but we avoid the magic
158and bytes checking.
159*/
160
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161static bool
162sv_eq_pvn_flags(pTHX_ const SV *sv, const char* pv, const STRLEN pvlen, const U32 flags) {
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163 if ( (SvUTF8(sv) & SVf_UTF8 ) != (flags & SVf_UTF8) ) {
164 const char *pv1 = SvPVX_const(sv);
165 STRLEN cur1 = SvCUR(sv);
166 const char *pv2 = pv;
167 STRLEN cur2 = pvlen;
168 if (PL_encoding) {
169 SV* svrecode = NULL;
170 if (SvUTF8(sv)) {
171 svrecode = newSVpvn(pv2, cur2);
172 sv_recode_to_utf8(svrecode, PL_encoding);
173 pv2 = SvPV_const(svrecode, cur2);
174 }
175 else {
176 svrecode = newSVpvn(pv1, cur1);
177 sv_recode_to_utf8(svrecode, PL_encoding);
178 pv1 = SvPV_const(svrecode, cur1);
179 }
fc2b2dca 180 SvREFCNT_dec_NN(svrecode);
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181 }
182 if (flags & SVf_UTF8)
183 return (bytes_cmp_utf8(
184 (const U8*)pv1, cur1,
185 (const U8*)pv2, cur2) == 0);
186 else
187 return (bytes_cmp_utf8(
188 (const U8*)pv2, cur2,
189 (const U8*)pv1, cur1) == 0);
190 }
191 else
192 return ((SvPVX_const(sv) == pv)
193 || memEQ(SvPVX_const(sv), pv, pvlen));
194}
195
196
197/*
cc76b5cc 198=for apidoc Am|PADLIST *|pad_new|int flags
dd2155a4 199
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200Create a new padlist, updating the global variables for the
201currently-compiling padlist to point to the new padlist. The following
202flags can be OR'ed together:
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203
204 padnew_CLONE this pad is for a cloned CV
cc76b5cc 205 padnew_SAVE save old globals on the save stack
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206 padnew_SAVESUB also save extra stuff for start of sub
207
208=cut
209*/
210
211PADLIST *
c7c737cb 212Perl_pad_new(pTHX_ int flags)
dd2155a4 213{
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214 PADLIST *padlist;
215 PAD *padname, *pad;
216 PAD **ary;
dd2155a4 217
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218 ASSERT_CURPAD_LEGAL("pad_new");
219
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220 /* XXX DAPM really need a new SAVEt_PAD which restores all or most
221 * vars (based on flags) rather than storing vals + addresses for
222 * each individually. Also see pad_block_start.
223 * XXX DAPM Try to see whether all these conditionals are required
224 */
225
226 /* save existing state, ... */
227
228 if (flags & padnew_SAVE) {
3979c56f 229 SAVECOMPPAD();
dd2155a4 230 if (! (flags & padnew_CLONE)) {
cbacc9aa 231 SAVESPTR(PL_comppad_name);
dd2155a4 232 SAVEI32(PL_padix);
b54c5e14 233 SAVEI32(PL_constpadix);
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234 SAVEI32(PL_comppad_name_fill);
235 SAVEI32(PL_min_intro_pending);
236 SAVEI32(PL_max_intro_pending);
8bbe96d7 237 SAVEBOOL(PL_cv_has_eval);
dd2155a4 238 if (flags & padnew_SAVESUB) {
f0cb02e3 239 SAVEBOOL(PL_pad_reset_pending);
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240 }
241 }
242 }
243 /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be
244 * saved - check at some pt that this is okay */
245
246 /* ... create new pad ... */
247
7261499d 248 Newxz(padlist, 1, PADLIST);
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249 pad = newAV();
250
251 if (flags & padnew_CLONE) {
252 /* XXX DAPM I dont know why cv_clone needs it
253 * doing differently yet - perhaps this separate branch can be
254 * dispensed with eventually ???
255 */
256
e1ec3a88 257 AV * const a0 = newAV(); /* will be @_ */
ad64d0ec 258 av_store(pad, 0, MUTABLE_SV(a0));
11ca45c0 259 AvREIFY_only(a0);
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260
261 padname = (PAD *)SvREFCNT_inc_simple_NN(PL_comppad_name);
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262 }
263 else {
a0714e2c 264 av_store(pad, 0, NULL);
9ef8d569 265 padname = newAV();
7db6405c 266 AvPAD_NAMELIST_on(padname);
ce0d59fd 267 av_store(padname, 0, &PL_sv_undef);
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268 }
269
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270 /* Most subroutines never recurse, hence only need 2 entries in the padlist
271 array - names, and depth=1. The default for av_store() is to allocate
272 0..3, and even an explicit call to av_extend() with <3 will be rounded
273 up, so we inline the allocation of the array here. */
7261499d 274 Newx(ary, 2, PAD *);
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275 PadlistMAX(padlist) = 1;
276 PadlistARRAY(padlist) = ary;
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277 ary[0] = padname;
278 ary[1] = pad;
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279
280 /* ... then update state variables */
281
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282 PL_comppad = pad;
283 PL_curpad = AvARRAY(pad);
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284
285 if (! (flags & padnew_CLONE)) {
9ef8d569 286 PL_comppad_name = padname;
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287 PL_comppad_name_fill = 0;
288 PL_min_intro_pending = 0;
289 PL_padix = 0;
b54c5e14 290 PL_constpadix = 0;
b5c19bd7 291 PL_cv_has_eval = 0;
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292 }
293
294 DEBUG_X(PerlIO_printf(Perl_debug_log,
b5c19bd7 295 "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf
dd2155a4 296 " name=0x%"UVxf" flags=0x%"UVxf"\n",
b5c19bd7 297 PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv),
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298 PTR2UV(padname), (UV)flags
299 )
300 );
301
302 return (PADLIST*)padlist;
303}
304
dd2155a4 305
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306/*
307=head1 Embedding Functions
308
309=for apidoc cv_undef
310
72d33970 311Clear out all the active components of a CV. This can happen either
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312by an explicit C<undef &foo>, or by the reference count going to zero.
313In the former case, we keep the CvOUTSIDE pointer, so that any anonymous
314children can still follow the full lexical scope chain.
315
316=cut
317*/
318
319void
320Perl_cv_undef(pTHX_ CV *cv)
321{
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322 PERL_ARGS_ASSERT_CV_UNDEF;
323 cv_undef_flags(cv, 0);
324}
325
326void
327Perl_cv_undef_flags(pTHX_ CV *cv, U32 flags)
328{
c2736fce 329 const PADLIST *padlist = CvPADLIST(cv);
8be227ab 330 bool const slabbed = !!CvSLABBED(cv);
c4528262 331
b7acb0a3 332 PERL_ARGS_ASSERT_CV_UNDEF_FLAGS;
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333
334 DEBUG_X(PerlIO_printf(Perl_debug_log,
335 "CV undef: cv=0x%"UVxf" comppad=0x%"UVxf"\n",
336 PTR2UV(cv), PTR2UV(PL_comppad))
337 );
338
bad4ae38 339 if (CvFILE(cv) && CvDYNFILE(cv)) {
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340 Safefree(CvFILE(cv));
341 }
342 CvFILE(cv) = NULL;
dd2155a4 343
8be227ab 344 CvSLABBED_off(cv);
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345 if (!CvISXSUB(cv) && CvROOT(cv)) {
346 if (SvTYPE(cv) == SVt_PVCV && CvDEPTH(cv))
347 Perl_croak(aTHX_ "Can't undef active subroutine");
348 ENTER;
349
350 PAD_SAVE_SETNULLPAD();
351
8be227ab 352 if (slabbed) OpslabREFCNT_dec_padok(OpSLAB(CvROOT(cv)));
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353 op_free(CvROOT(cv));
354 CvROOT(cv) = NULL;
355 CvSTART(cv) = NULL;
356 LEAVE;
357 }
8be227ab
FC
358 else if (slabbed && CvSTART(cv)) {
359 ENTER;
360 PAD_SAVE_SETNULLPAD();
361
362 /* discard any leaked ops */
3ac7ff8f
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363 if (PL_parser)
364 parser_free_nexttoke_ops(PL_parser, (OPSLAB *)CvSTART(cv));
8be227ab
FC
365 opslab_force_free((OPSLAB *)CvSTART(cv));
366 CvSTART(cv) = NULL;
367
368 LEAVE;
369 }
7aef8e5b 370#ifdef DEBUGGING
eb212a1c 371 else if (slabbed) Perl_warn(aTHX_ "Slab leaked from cv %p", (void*)cv);
8be227ab 372#endif
c4528262 373 SvPOK_off(MUTABLE_SV(cv)); /* forget prototype */
2f14e398 374 sv_unmagic((SV *)cv, PERL_MAGIC_checkcall);
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FC
375 if (!(flags & CV_UNDEF_KEEP_NAME)) {
376 if (CvNAMED(cv)) {
377 CvNAME_HEK_set(cv, NULL);
378 CvNAMED_off(cv);
379 }
380 else CvGV_set(cv, NULL);
381 }
c4528262 382
c2736fce
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383 /* This statement and the subsequence if block was pad_undef(). */
384 pad_peg("pad_undef");
385
7261499d 386 if (padlist) {
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387 I32 ix;
388
389 /* Free the padlist associated with a CV.
390 If parts of it happen to be current, we null the relevant PL_*pad*
391 global vars so that we don't have any dangling references left.
392 We also repoint the CvOUTSIDE of any about-to-be-orphaned inner
393 subs to the outer of this cv. */
394
395 DEBUG_X(PerlIO_printf(Perl_debug_log,
396 "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf" comppad=0x%"UVxf"\n",
397 PTR2UV(cv), PTR2UV(padlist), PTR2UV(PL_comppad))
398 );
399
400 /* detach any '&' anon children in the pad; if afterwards they
401 * are still live, fix up their CvOUTSIDEs to point to our outside,
402 * bypassing us. */
403 /* XXX DAPM for efficiency, we should only do this if we know we have
404 * children, or integrate this loop with general cleanup */
405
406 if (PL_phase != PERL_PHASE_DESTRUCT) { /* don't bother during global destruction */
407 CV * const outercv = CvOUTSIDE(cv);
408 const U32 seq = CvOUTSIDE_SEQ(cv);
86d2498c 409 PAD * const comppad_name = PadlistARRAY(padlist)[0];
c2736fce 410 SV ** const namepad = AvARRAY(comppad_name);
86d2498c 411 PAD * const comppad = PadlistARRAY(padlist)[1];
c2736fce
NC
412 SV ** const curpad = AvARRAY(comppad);
413 for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
414 SV * const namesv = namepad[ix];
415 if (namesv && namesv != &PL_sv_undef
416 && *SvPVX_const(namesv) == '&')
417 {
418 CV * const innercv = MUTABLE_CV(curpad[ix]);
419 U32 inner_rc = SvREFCNT(innercv);
420 assert(inner_rc);
e09ac076 421 assert(SvTYPE(innercv) != SVt_PVFM);
c2736fce
NC
422
423 if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */
424 curpad[ix] = NULL;
fc2b2dca 425 SvREFCNT_dec_NN(innercv);
c2736fce
NC
426 inner_rc--;
427 }
428
429 /* in use, not just a prototype */
430 if (inner_rc && (CvOUTSIDE(innercv) == cv)) {
431 assert(CvWEAKOUTSIDE(innercv));
432 /* don't relink to grandfather if he's being freed */
433 if (outercv && SvREFCNT(outercv)) {
434 CvWEAKOUTSIDE_off(innercv);
435 CvOUTSIDE(innercv) = outercv;
436 CvOUTSIDE_SEQ(innercv) = seq;
437 SvREFCNT_inc_simple_void_NN(outercv);
438 }
439 else {
440 CvOUTSIDE(innercv) = NULL;
441 }
442 }
443 }
444 }
445 }
446
86d2498c 447 ix = PadlistMAX(padlist);
aa2f79cf 448 while (ix > 0) {
86d2498c 449 PAD * const sv = PadlistARRAY(padlist)[ix--];
c2736fce 450 if (sv) {
7261499d 451 if (sv == PL_comppad) {
c2736fce
NC
452 PL_comppad = NULL;
453 PL_curpad = NULL;
454 }
fc2b2dca 455 SvREFCNT_dec_NN(sv);
c2736fce 456 }
aa2f79cf
NC
457 }
458 {
86d2498c 459 PAD * const sv = PadlistARRAY(padlist)[0];
9ef8d569 460 if (sv == PL_comppad_name && SvREFCNT(sv) == 1)
aa2f79cf 461 PL_comppad_name = NULL;
c2736fce
NC
462 SvREFCNT_dec(sv);
463 }
86d2498c 464 if (PadlistARRAY(padlist)) Safefree(PadlistARRAY(padlist));
7261499d 465 Safefree(padlist);
c2736fce
NC
466 CvPADLIST(cv) = NULL;
467 }
468
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NC
469
470 /* remove CvOUTSIDE unless this is an undef rather than a free */
471 if (!SvREFCNT(cv) && CvOUTSIDE(cv)) {
472 if (!CvWEAKOUTSIDE(cv))
473 SvREFCNT_dec(CvOUTSIDE(cv));
474 CvOUTSIDE(cv) = NULL;
475 }
476 if (CvCONST(cv)) {
477 SvREFCNT_dec(MUTABLE_SV(CvXSUBANY(cv).any_ptr));
478 CvCONST_off(cv);
479 }
480 if (CvISXSUB(cv) && CvXSUB(cv)) {
481 CvXSUB(cv) = NULL;
482 }
483 /* delete all flags except WEAKOUTSIDE and CVGV_RC, which indicate the
b7acb0a3
FC
484 * ref status of CvOUTSIDE and CvGV, and ANON, NAMED and
485 * LEXICAL, which are used to determine the sub's name. */
486 CvFLAGS(cv) &= (CVf_WEAKOUTSIDE|CVf_CVGV_RC|CVf_ANON|CVf_LEXICAL
487 |CVf_NAMED);
c4528262 488}
dd2155a4 489
50dc2bd3
FC
490/*
491=for apidoc cv_forget_slab
492
493When a CV has a reference count on its slab (CvSLABBED), it is responsible
494for making sure it is freed. (Hence, no two CVs should ever have a
495reference count on the same slab.) The CV only needs to reference the slab
496during compilation. Once it is compiled and CvROOT attached, it has
497finished its job, so it can forget the slab.
498
499=cut
500*/
501
8be227ab
FC
502void
503Perl_cv_forget_slab(pTHX_ CV *cv)
504{
505 const bool slabbed = !!CvSLABBED(cv);
3107b51f 506 OPSLAB *slab = NULL;
8be227ab
FC
507
508 PERL_ARGS_ASSERT_CV_FORGET_SLAB;
509
510 if (!slabbed) return;
511
512 CvSLABBED_off(cv);
513
3107b51f
FC
514 if (CvROOT(cv)) slab = OpSLAB(CvROOT(cv));
515 else if (CvSTART(cv)) slab = (OPSLAB *)CvSTART(cv);
7aef8e5b 516#ifdef DEBUGGING
eb212a1c 517 else if (slabbed) Perl_warn(aTHX_ "Slab leaked from cv %p", (void*)cv);
7aef8e5b 518#endif
3107b51f 519
3107b51f 520 if (slab) {
f3e29105
NC
521#ifdef PERL_DEBUG_READONLY_OPS
522 const size_t refcnt = slab->opslab_refcnt;
523#endif
3107b51f 524 OpslabREFCNT_dec(slab);
f3e29105 525#ifdef PERL_DEBUG_READONLY_OPS
3107b51f 526 if (refcnt > 1) Slab_to_ro(slab);
8be227ab 527#endif
f3e29105 528 }
7aef8e5b 529}
8be227ab 530
cc76b5cc
Z
531/*
532=for apidoc m|PADOFFSET|pad_alloc_name|SV *namesv|U32 flags|HV *typestash|HV *ourstash
533
1a115e49
FC
534Allocates a place in the currently-compiling
535pad (via L<perlapi/pad_alloc>) and
cc76b5cc
Z
536then stores a name for that entry. I<namesv> is adopted and becomes the
537name entry; it must already contain the name string and be sufficiently
538upgraded. I<typestash> and I<ourstash> and the C<padadd_STATE> flag get
1a115e49
FC
539added to I<namesv>. None of the other
540processing of L<perlapi/pad_add_name_pvn>
cc76b5cc
Z
541is done. Returns the offset of the allocated pad slot.
542
543=cut
544*/
545
3291825f 546static PADOFFSET
cc76b5cc 547S_pad_alloc_name(pTHX_ SV *namesv, U32 flags, HV *typestash, HV *ourstash)
3291825f 548{
3291825f
NC
549 const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY);
550
cc76b5cc 551 PERL_ARGS_ASSERT_PAD_ALLOC_NAME;
3291825f 552
cc76b5cc 553 ASSERT_CURPAD_ACTIVE("pad_alloc_name");
3291825f
NC
554
555 if (typestash) {
556 assert(SvTYPE(namesv) == SVt_PVMG);
557 SvPAD_TYPED_on(namesv);
558 SvSTASH_set(namesv, MUTABLE_HV(SvREFCNT_inc_simple_NN(MUTABLE_SV(typestash))));
559 }
560 if (ourstash) {
561 SvPAD_OUR_on(namesv);
562 SvOURSTASH_set(namesv, ourstash);
563 SvREFCNT_inc_simple_void_NN(ourstash);
564 }
59cfed7d 565 else if (flags & padadd_STATE) {
3291825f
NC
566 SvPAD_STATE_on(namesv);
567 }
568
569 av_store(PL_comppad_name, offset, namesv);
7db6405c 570 PadnamelistMAXNAMED(PL_comppad_name) = offset;
3291825f
NC
571 return offset;
572}
573
dd2155a4 574/*
cc76b5cc 575=for apidoc Am|PADOFFSET|pad_add_name_pvn|const char *namepv|STRLEN namelen|U32 flags|HV *typestash|HV *ourstash
dd2155a4 576
cc76b5cc
Z
577Allocates a place in the currently-compiling pad for a named lexical
578variable. Stores the name and other metadata in the name part of the
579pad, and makes preparations to manage the variable's lexical scoping.
580Returns the offset of the allocated pad slot.
dd2155a4 581
cc76b5cc
Z
582I<namepv>/I<namelen> specify the variable's name, including leading sigil.
583If I<typestash> is non-null, the name is for a typed lexical, and this
584identifies the type. If I<ourstash> is non-null, it's a lexical reference
585to a package variable, and this identifies the package. The following
586flags can be OR'ed together:
587
588 padadd_OUR redundantly specifies if it's a package var
589 padadd_STATE variable will retain value persistently
590 padadd_NO_DUP_CHECK skip check for lexical shadowing
dd2155a4
DM
591
592=cut
593*/
594
dd2155a4 595PADOFFSET
cc76b5cc
Z
596Perl_pad_add_name_pvn(pTHX_ const char *namepv, STRLEN namelen,
597 U32 flags, HV *typestash, HV *ourstash)
dd2155a4 598{
3291825f 599 PADOFFSET offset;
cca43f78 600 SV *namesv;
e8b34487 601 bool is_utf8;
dd2155a4 602
cc76b5cc 603 PERL_ARGS_ASSERT_PAD_ADD_NAME_PVN;
7918f24d 604
2435e5d3 605 if (flags & ~(padadd_OUR|padadd_STATE|padadd_NO_DUP_CHECK|padadd_UTF8_NAME))
cc76b5cc 606 Perl_croak(aTHX_ "panic: pad_add_name_pvn illegal flag bits 0x%" UVxf,
cca43f78
NC
607 (UV)flags);
608
609 namesv = newSV_type((ourstash || typestash) ? SVt_PVMG : SVt_PVNV);
e8b34487
BF
610
611 if ((is_utf8 = ((flags & padadd_UTF8_NAME) != 0))) {
612 namepv = (const char*)bytes_from_utf8((U8*)namepv, &namelen, &is_utf8);
613 }
614
0727928e
BF
615 sv_setpvn(namesv, namepv, namelen);
616
e8b34487
BF
617 if (is_utf8) {
618 flags |= padadd_UTF8_NAME;
619 SvUTF8_on(namesv);
620 }
621 else
622 flags &= ~padadd_UTF8_NAME;
dd2155a4 623
59cfed7d 624 if ((flags & padadd_NO_DUP_CHECK) == 0) {
c2b36a6d
FC
625 ENTER;
626 SAVEFREESV(namesv); /* in case of fatal warnings */
2d12d04f 627 /* check for duplicate declaration */
59cfed7d 628 pad_check_dup(namesv, flags & padadd_OUR, ourstash);
c2b36a6d
FC
629 SvREFCNT_inc_simple_void_NN(namesv);
630 LEAVE;
2d12d04f
NC
631 }
632
2435e5d3 633 offset = pad_alloc_name(namesv, flags & ~padadd_UTF8_NAME, typestash, ourstash);
3291825f
NC
634
635 /* not yet introduced */
2df5bdd7
DM
636 COP_SEQ_RANGE_LOW_set(namesv, PERL_PADSEQ_INTRO);
637 COP_SEQ_RANGE_HIGH_set(namesv, 0);
3291825f
NC
638
639 if (!PL_min_intro_pending)
640 PL_min_intro_pending = offset;
641 PL_max_intro_pending = offset;
642 /* if it's not a simple scalar, replace with an AV or HV */
c1bf42f3
NC
643 assert(SvTYPE(PL_curpad[offset]) == SVt_NULL);
644 assert(SvREFCNT(PL_curpad[offset]) == 1);
cc76b5cc 645 if (namelen != 0 && *namepv == '@')
c1bf42f3 646 sv_upgrade(PL_curpad[offset], SVt_PVAV);
cc76b5cc 647 else if (namelen != 0 && *namepv == '%')
c1bf42f3 648 sv_upgrade(PL_curpad[offset], SVt_PVHV);
6d5c2147
FC
649 else if (namelen != 0 && *namepv == '&')
650 sv_upgrade(PL_curpad[offset], SVt_PVCV);
c1bf42f3 651 assert(SvPADMY(PL_curpad[offset]));
3291825f
NC
652 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
653 "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n",
cc76b5cc
Z
654 (long)offset, SvPVX(namesv),
655 PTR2UV(PL_curpad[offset])));
dd2155a4
DM
656
657 return offset;
658}
659
cc76b5cc
Z
660/*
661=for apidoc Am|PADOFFSET|pad_add_name_pv|const char *name|U32 flags|HV *typestash|HV *ourstash
dd2155a4 662
cc76b5cc
Z
663Exactly like L</pad_add_name_pvn>, but takes a nul-terminated string
664instead of a string/length pair.
dd2155a4 665
cc76b5cc
Z
666=cut
667*/
668
669PADOFFSET
670Perl_pad_add_name_pv(pTHX_ const char *name,
0e1b3a4b 671 const U32 flags, HV *typestash, HV *ourstash)
cc76b5cc
Z
672{
673 PERL_ARGS_ASSERT_PAD_ADD_NAME_PV;
674 return pad_add_name_pvn(name, strlen(name), flags, typestash, ourstash);
675}
dd2155a4
DM
676
677/*
cc76b5cc 678=for apidoc Am|PADOFFSET|pad_add_name_sv|SV *name|U32 flags|HV *typestash|HV *ourstash
dd2155a4 679
cc76b5cc
Z
680Exactly like L</pad_add_name_pvn>, but takes the name string in the form
681of an SV instead of a string/length pair.
682
683=cut
684*/
685
686PADOFFSET
687Perl_pad_add_name_sv(pTHX_ SV *name, U32 flags, HV *typestash, HV *ourstash)
688{
689 char *namepv;
690 STRLEN namelen;
691 PERL_ARGS_ASSERT_PAD_ADD_NAME_SV;
692 namepv = SvPV(name, namelen);
e8b34487
BF
693 if (SvUTF8(name))
694 flags |= padadd_UTF8_NAME;
cc76b5cc
Z
695 return pad_add_name_pvn(namepv, namelen, flags, typestash, ourstash);
696}
697
698/*
699=for apidoc Amx|PADOFFSET|pad_alloc|I32 optype|U32 tmptype
700
701Allocates a place in the currently-compiling pad,
702returning the offset of the allocated pad slot.
703No name is initially attached to the pad slot.
704I<tmptype> is a set of flags indicating the kind of pad entry required,
705which will be set in the value SV for the allocated pad entry:
706
707 SVs_PADMY named lexical variable ("my", "our", "state")
708 SVs_PADTMP unnamed temporary store
325e1816
FC
709 SVf_READONLY constant shared between recursion levels
710
711C<SVf_READONLY> has been supported here only since perl 5.20. To work with
c370bd2e
FC
712earlier versions as well, use C<SVf_READONLY|SVs_PADTMP>. C<SVf_READONLY>
713does not cause the SV in the pad slot to be marked read-only, but simply
714tells C<pad_alloc> that it I<will> be made read-only (by the caller), or at
715least should be treated as such.
cc76b5cc
Z
716
717I<optype> should be an opcode indicating the type of operation that the
718pad entry is to support. This doesn't affect operational semantics,
719but is used for debugging.
dd2155a4
DM
720
721=cut
722*/
723
724/* XXX DAPM integrate alloc(), add_name() and add_anon(),
725 * or at least rationalise ??? */
dd2155a4
DM
726
727PADOFFSET
728Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
729{
730 SV *sv;
731 I32 retval;
732
6136c704 733 PERL_UNUSED_ARG(optype);
f3548bdc
DM
734 ASSERT_CURPAD_ACTIVE("pad_alloc");
735
dd2155a4 736 if (AvARRAY(PL_comppad) != PL_curpad)
5637ef5b
NC
737 Perl_croak(aTHX_ "panic: pad_alloc, %p!=%p",
738 AvARRAY(PL_comppad), PL_curpad);
dd2155a4
DM
739 if (PL_pad_reset_pending)
740 pad_reset();
741 if (tmptype & SVs_PADMY) {
cc76b5cc 742 /* For a my, simply push a null SV onto the end of PL_comppad. */
235cc2e3 743 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
dd2155a4
DM
744 retval = AvFILLp(PL_comppad);
745 }
746 else {
cc76b5cc
Z
747 /* For a tmp, scan the pad from PL_padix upwards
748 * for a slot which has no name and no active value.
b54c5e14 749 * For a constant, likewise, but use PL_constpadix.
cc76b5cc 750 */
551405c4 751 SV * const * const names = AvARRAY(PL_comppad_name);
e1ec3a88 752 const SSize_t names_fill = AvFILLp(PL_comppad_name);
b54c5e14
FC
753 const bool konst = cBOOL(tmptype & SVf_READONLY);
754 retval = konst ? PL_constpadix : PL_padix;
dd2155a4
DM
755 for (;;) {
756 /*
833bf1cd
FC
757 * Entries that close over unavailable variables
758 * in outer subs contain values not marked PADMY.
759 * Thus we must skip, not just pad values that are
dd2155a4 760 * marked as current pad values, but also those with names.
1780e744
FC
761 * If pad_reset is enabled, ‘current’ means different
762 * things depending on whether we are allocating a con-
763 * stant or a target. For a target, things marked PADTMP
764 * can be reused; not so for constants.
dd2155a4 765 */
b54c5e14
FC
766 if (++retval <= names_fill &&
767 (sv = names[retval]) && sv != &PL_sv_undef)
dd2155a4 768 continue;
b54c5e14 769 sv = *av_fetch(PL_comppad, retval, TRUE);
a90643eb 770 if (!(SvFLAGS(sv) &
53de1311 771#ifdef USE_PAD_RESET
b54c5e14 772 (SVs_PADMY|(konst ? SVs_PADTMP : 0))
a90643eb
FC
773#else
774 (SVs_PADMY|SVs_PADTMP)
775#endif
13381c39 776 ))
dd2155a4
DM
777 break;
778 }
b54c5e14
FC
779 if (konst) {
780 av_store(PL_comppad_name, retval, &PL_sv_no);
325e1816
FC
781 tmptype &= ~SVf_READONLY;
782 tmptype |= SVs_PADTMP;
783 }
b54c5e14 784 *(konst ? &PL_constpadix : &PL_padix) = retval;
dd2155a4
DM
785 }
786 SvFLAGS(sv) |= tmptype;
787 PL_curpad = AvARRAY(PL_comppad);
788
789 DEBUG_X(PerlIO_printf(Perl_debug_log,
790 "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n",
791 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval,
792 PL_op_name[optype]));
fd0854ff
DM
793#ifdef DEBUG_LEAKING_SCALARS
794 sv->sv_debug_optype = optype;
795 sv->sv_debug_inpad = 1;
fd0854ff 796#endif
a212c8b5 797 return (PADOFFSET)retval;
dd2155a4
DM
798}
799
800/*
cc76b5cc 801=for apidoc Am|PADOFFSET|pad_add_anon|CV *func|I32 optype
dd2155a4 802
cc76b5cc
Z
803Allocates a place in the currently-compiling pad (via L</pad_alloc>)
804for an anonymous function that is lexically scoped inside the
805currently-compiling function.
806The function I<func> is linked into the pad, and its C<CvOUTSIDE> link
807to the outer scope is weakened to avoid a reference loop.
808
84eea980
FC
809One reference count is stolen, so you may need to do C<SvREFCNT_inc(func)>.
810
cc76b5cc
Z
811I<optype> should be an opcode indicating the type of operation that the
812pad entry is to support. This doesn't affect operational semantics,
813but is used for debugging.
dd2155a4
DM
814
815=cut
816*/
817
818PADOFFSET
cc76b5cc 819Perl_pad_add_anon(pTHX_ CV* func, I32 optype)
dd2155a4
DM
820{
821 PADOFFSET ix;
b9f83d2f 822 SV* const name = newSV_type(SVt_PVNV);
7918f24d
NC
823
824 PERL_ARGS_ASSERT_PAD_ADD_ANON;
825
1dba731d 826 pad_peg("add_anon");
76f68e9b 827 sv_setpvs(name, "&");
0d311cdb
DM
828 /* These two aren't used; just make sure they're not equal to
829 * PERL_PADSEQ_INTRO */
830 COP_SEQ_RANGE_LOW_set(name, 0);
831 COP_SEQ_RANGE_HIGH_set(name, 0);
cc76b5cc 832 ix = pad_alloc(optype, SVs_PADMY);
dd2155a4 833 av_store(PL_comppad_name, ix, name);
f3548bdc 834 /* XXX DAPM use PL_curpad[] ? */
e09ac076
FC
835 if (SvTYPE(func) == SVt_PVCV || !CvOUTSIDE(func))
836 av_store(PL_comppad, ix, (SV*)func);
837 else {
7c93c29b 838 SV *rv = newRV_noinc((SV *)func);
e09ac076
FC
839 sv_rvweaken(rv);
840 assert (SvTYPE(func) == SVt_PVFM);
841 av_store(PL_comppad, ix, rv);
842 }
cc76b5cc 843 SvPADMY_on((SV*)func);
7dafbf52
DM
844
845 /* to avoid ref loops, we never have parent + child referencing each
846 * other simultaneously */
e09ac076 847 if (CvOUTSIDE(func) && SvTYPE(func) == SVt_PVCV) {
cc76b5cc
Z
848 assert(!CvWEAKOUTSIDE(func));
849 CvWEAKOUTSIDE_on(func);
fc2b2dca 850 SvREFCNT_dec_NN(CvOUTSIDE(func));
7dafbf52 851 }
dd2155a4
DM
852 return ix;
853}
854
dd2155a4 855/*
13087dd8 856=for apidoc pad_check_dup
dd2155a4
DM
857
858Check for duplicate declarations: report any of:
13087dd8 859
dd2155a4 860 * a my in the current scope with the same name;
13087dd8
FC
861 * an our (anywhere in the pad) with the same name and the
862 same stash as C<ourstash>
863
864C<is_our> indicates that the name to check is an 'our' declaration.
dd2155a4
DM
865
866=cut
867*/
868
20381b50 869STATIC void
cc76b5cc 870S_pad_check_dup(pTHX_ SV *name, U32 flags, const HV *ourstash)
dd2155a4 871{
53c1dcc0 872 SV **svp;
dd2155a4 873 PADOFFSET top, off;
59cfed7d 874 const U32 is_our = flags & padadd_OUR;
dd2155a4 875
7918f24d
NC
876 PERL_ARGS_ASSERT_PAD_CHECK_DUP;
877
f3548bdc 878 ASSERT_CURPAD_ACTIVE("pad_check_dup");
35f82371 879
59cfed7d 880 assert((flags & ~padadd_OUR) == 0);
35f82371 881
041457d9 882 if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC))
dd2155a4
DM
883 return; /* nothing to check */
884
885 svp = AvARRAY(PL_comppad_name);
886 top = AvFILLp(PL_comppad_name);
887 /* check the current scope */
888 /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same
889 * type ? */
890 for (off = top; (I32)off > PL_comppad_name_floor; off--) {
53c1dcc0
AL
891 SV * const sv = svp[off];
892 if (sv
325e1816 893 && PadnameLEN(sv)
ee6cee0c 894 && !SvFAKE(sv)
0d311cdb
DM
895 && ( COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO
896 || COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO)
2d12d04f 897 && sv_eq(name, sv))
dd2155a4 898 {
00b1698f 899 if (is_our && (SvPAD_OUR(sv)))
7f73a9f1 900 break; /* "our" masking "our" */
4eb94d7c 901 /* diag_listed_as: "%s" variable %s masks earlier declaration in same %s */
dd2155a4 902 Perl_warner(aTHX_ packWARN(WARN_MISC),
4eb94d7c 903 "\"%s\" %s %"SVf" masks earlier declaration in same %s",
12bd6ede 904 (is_our ? "our" : PL_parser->in_my == KEY_my ? "my" : "state"),
4eb94d7c 905 *SvPVX(sv) == '&' ? "subroutine" : "variable",
c1f6cd39 906 SVfARG(sv),
2df5bdd7
DM
907 (COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO
908 ? "scope" : "statement"));
dd2155a4
DM
909 --off;
910 break;
911 }
912 }
913 /* check the rest of the pad */
914 if (is_our) {
61c5492a 915 while (off > 0) {
53c1dcc0
AL
916 SV * const sv = svp[off];
917 if (sv
325e1816 918 && PadnameLEN(sv)
ee6cee0c 919 && !SvFAKE(sv)
0d311cdb
DM
920 && ( COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO
921 || COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO)
73d95100 922 && SvOURSTASH(sv) == ourstash
2d12d04f 923 && sv_eq(name, sv))
dd2155a4
DM
924 {
925 Perl_warner(aTHX_ packWARN(WARN_MISC),
c1f6cd39 926 "\"our\" variable %"SVf" redeclared", SVfARG(sv));
624f69f5 927 if ((I32)off <= PL_comppad_name_floor)
7f73a9f1
RGS
928 Perl_warner(aTHX_ packWARN(WARN_MISC),
929 "\t(Did you mean \"local\" instead of \"our\"?)\n");
dd2155a4
DM
930 break;
931 }
61c5492a
NC
932 --off;
933 }
dd2155a4
DM
934 }
935}
936
937
dd2155a4 938/*
cc76b5cc 939=for apidoc Am|PADOFFSET|pad_findmy_pvn|const char *namepv|STRLEN namelen|U32 flags
dd2155a4 940
cc76b5cc
Z
941Given the name of a lexical variable, find its position in the
942currently-compiling pad.
943I<namepv>/I<namelen> specify the variable's name, including leading sigil.
944I<flags> is reserved and must be zero.
945If it is not in the current pad but appears in the pad of any lexically
946enclosing scope, then a pseudo-entry for it is added in the current pad.
947Returns the offset in the current pad,
948or C<NOT_IN_PAD> if no such lexical is in scope.
dd2155a4
DM
949
950=cut
951*/
952
953PADOFFSET
cc76b5cc 954Perl_pad_findmy_pvn(pTHX_ const char *namepv, STRLEN namelen, U32 flags)
dd2155a4 955{
b5c19bd7
DM
956 SV *out_sv;
957 int out_flags;
929a0744 958 I32 offset;
e1ec3a88 959 const AV *nameav;
929a0744 960 SV **name_svp;
dd2155a4 961
cc76b5cc 962 PERL_ARGS_ASSERT_PAD_FINDMY_PVN;
7918f24d 963
cc76b5cc 964 pad_peg("pad_findmy_pvn");
f8f98e0a 965
2435e5d3 966 if (flags & ~padadd_UTF8_NAME)
cc76b5cc 967 Perl_croak(aTHX_ "panic: pad_findmy_pvn illegal flag bits 0x%" UVxf,
f8f98e0a
NC
968 (UV)flags);
969
e8b34487
BF
970 if (flags & padadd_UTF8_NAME) {
971 bool is_utf8 = TRUE;
972 namepv = (const char*)bytes_from_utf8((U8*)namepv, &namelen, &is_utf8);
973
974 if (is_utf8)
975 flags |= padadd_UTF8_NAME;
976 else
977 flags &= ~padadd_UTF8_NAME;
978 }
979
fbb889c8
BF
980 offset = pad_findlex(namepv, namelen, flags,
981 PL_compcv, PL_cop_seqmax, 1, NULL, &out_sv, &out_flags);
9f7d9405 982 if ((PADOFFSET)offset != NOT_IN_PAD)
929a0744
DM
983 return offset;
984
f0727190
FC
985 /* Skip the ‘our’ hack for subroutines, as the warning does not apply.
986 */
987 if (*namepv == '&') return NOT_IN_PAD;
988
929a0744
DM
989 /* look for an our that's being introduced; this allows
990 * our $foo = 0 unless defined $foo;
991 * to not give a warning. (Yes, this is a hack) */
992
86d2498c 993 nameav = PadlistARRAY(CvPADLIST(PL_compcv))[0];
929a0744 994 name_svp = AvARRAY(nameav);
7f713aaa 995 for (offset = PadnamelistMAXNAMED(nameav); offset > 0; offset--) {
551405c4 996 const SV * const namesv = name_svp[offset];
325e1816 997 if (namesv && PadnameLEN(namesv) == namelen
929a0744 998 && !SvFAKE(namesv)
00b1698f 999 && (SvPAD_OUR(namesv))
e8b34487
BF
1000 && sv_eq_pvn_flags(aTHX_ namesv, namepv, namelen,
1001 flags & padadd_UTF8_NAME ? SVf_UTF8 : 0 )
2df5bdd7 1002 && COP_SEQ_RANGE_LOW(namesv) == PERL_PADSEQ_INTRO
929a0744
DM
1003 )
1004 return offset;
1005 }
1006 return NOT_IN_PAD;
dd2155a4
DM
1007}
1008
e1f795dc 1009/*
cc76b5cc
Z
1010=for apidoc Am|PADOFFSET|pad_findmy_pv|const char *name|U32 flags
1011
1012Exactly like L</pad_findmy_pvn>, but takes a nul-terminated string
1013instead of a string/length pair.
1014
1015=cut
1016*/
1017
1018PADOFFSET
1019Perl_pad_findmy_pv(pTHX_ const char *name, U32 flags)
1020{
1021 PERL_ARGS_ASSERT_PAD_FINDMY_PV;
1022 return pad_findmy_pvn(name, strlen(name), flags);
1023}
1024
1025/*
1026=for apidoc Am|PADOFFSET|pad_findmy_sv|SV *name|U32 flags
1027
1028Exactly like L</pad_findmy_pvn>, but takes the name string in the form
1029of an SV instead of a string/length pair.
1030
1031=cut
1032*/
1033
1034PADOFFSET
1035Perl_pad_findmy_sv(pTHX_ SV *name, U32 flags)
1036{
1037 char *namepv;
1038 STRLEN namelen;
1039 PERL_ARGS_ASSERT_PAD_FINDMY_SV;
1040 namepv = SvPV(name, namelen);
2435e5d3
BF
1041 if (SvUTF8(name))
1042 flags |= padadd_UTF8_NAME;
cc76b5cc
Z
1043 return pad_findmy_pvn(namepv, namelen, flags);
1044}
1045
1046/*
1047=for apidoc Amp|PADOFFSET|find_rundefsvoffset
1048
1049Find the position of the lexical C<$_> in the pad of the
1050currently-executing function. Returns the offset in the current pad,
1051or C<NOT_IN_PAD> if there is no lexical C<$_> in scope (in which case
1052the global one should be used instead).
1053L</find_rundefsv> is likely to be more convenient.
1054
1055=cut
1056*/
e1f795dc
RGS
1057
1058PADOFFSET
29289021 1059Perl_find_rundefsvoffset(pTHX)
e1f795dc
RGS
1060{
1061 SV *out_sv;
1062 int out_flags;
fbb889c8 1063 return pad_findlex("$_", 2, 0, find_runcv(NULL), PL_curcop->cop_seq, 1,
4608196e 1064 NULL, &out_sv, &out_flags);
e1f795dc 1065}
dd2155a4 1066
dd2155a4 1067/*
cc76b5cc
Z
1068=for apidoc Am|SV *|find_rundefsv
1069
1070Find and return the variable that is named C<$_> in the lexical scope
1071of the currently-executing function. This may be a lexical C<$_>,
1072or will otherwise be the global one.
1073
1074=cut
1075*/
789bd863
VP
1076
1077SV *
1078Perl_find_rundefsv(pTHX)
1079{
1080 SV *namesv;
1081 int flags;
1082 PADOFFSET po;
1083
fbb889c8 1084 po = pad_findlex("$_", 2, 0, find_runcv(NULL), PL_curcop->cop_seq, 1,
789bd863
VP
1085 NULL, &namesv, &flags);
1086
1979170b 1087 if (po == NOT_IN_PAD || SvPAD_OUR(namesv))
789bd863
VP
1088 return DEFSV;
1089
1090 return PAD_SVl(po);
1091}
1092
c086f97a
FC
1093SV *
1094Perl_find_rundefsv2(pTHX_ CV *cv, U32 seq)
1095{
1096 SV *namesv;
1097 int flags;
1098 PADOFFSET po;
1099
1100 PERL_ARGS_ASSERT_FIND_RUNDEFSV2;
1101
1102 po = pad_findlex("$_", 2, 0, cv, seq, 1,
1103 NULL, &namesv, &flags);
1104
1105 if (po == NOT_IN_PAD || SvPAD_OUR(namesv))
1106 return DEFSV;
1107
86d2498c 1108 return AvARRAY(PadlistARRAY(CvPADLIST(cv))[CvDEPTH(cv)])[po];
c086f97a
FC
1109}
1110
789bd863 1111/*
fbb889c8 1112=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
dd2155a4 1113
72d33970 1114Find a named lexical anywhere in a chain of nested pads. Add fake entries
b5c19bd7
DM
1115in the inner pads if it's found in an outer one.
1116
1117Returns the offset in the bottom pad of the lex or the fake lex.
1118cv is the CV in which to start the search, and seq is the current cop_seq
72d33970 1119to match against. If warn is true, print appropriate warnings. The out_*
b5c19bd7 1120vars return values, and so are pointers to where the returned values
72d33970 1121should be stored. out_capture, if non-null, requests that the innermost
b5c19bd7
DM
1122instance of the lexical is captured; out_name_sv is set to the innermost
1123matched namesv or fake namesv; out_flags returns the flags normally
1124associated with the IVX field of a fake namesv.
1125
1126Note that pad_findlex() is recursive; it recurses up the chain of CVs,
72d33970
FC
1127then comes back down, adding fake entries
1128as it goes. It has to be this way
3441fb63 1129because fake namesvs in anon protoypes have to store in xlow the index into
b5c19bd7 1130the parent pad.
dd2155a4
DM
1131
1132=cut
1133*/
1134
b5c19bd7
DM
1135/* the CV has finished being compiled. This is not a sufficient test for
1136 * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */
1137#define CvCOMPILED(cv) CvROOT(cv)
1138
71f882da 1139/* the CV does late binding of its lexicals */
e07561e6 1140#define CvLATE(cv) (CvANON(cv) || CvCLONE(cv) || SvTYPE(cv) == SVt_PVFM)
71f882da 1141
445f13ff
FC
1142static void
1143S_unavailable(pTHX_ SV *namesv)
1144{
1145 /* diag_listed_as: Variable "%s" is not available */
1146 Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE),
1147 "%se \"%"SVf"\" is not available",
1148 *SvPVX_const(namesv) == '&'
1149 ? "Subroutin"
1150 : "Variabl",
c1f6cd39 1151 SVfARG(namesv));
445f13ff 1152}
b5c19bd7 1153
dd2155a4 1154STATIC PADOFFSET
fbb889c8 1155S_pad_findlex(pTHX_ const char *namepv, STRLEN namelen, U32 flags, const CV* cv, U32 seq,
cc76b5cc 1156 int warn, SV** out_capture, SV** out_name_sv, int *out_flags)
dd2155a4 1157{
b5c19bd7
DM
1158 I32 offset, new_offset;
1159 SV *new_capture;
1160 SV **new_capturep;
b70d5558 1161 const PADLIST * const padlist = CvPADLIST(cv);
7ef30830 1162 const bool staleok = !!(flags & padadd_STALEOK);
dd2155a4 1163
7918f24d
NC
1164 PERL_ARGS_ASSERT_PAD_FINDLEX;
1165
7ef30830 1166 if (flags & ~(padadd_UTF8_NAME|padadd_STALEOK))
2435e5d3
BF
1167 Perl_croak(aTHX_ "panic: pad_findlex illegal flag bits 0x%" UVxf,
1168 (UV)flags);
7ef30830 1169 flags &= ~ padadd_STALEOK; /* one-shot flag */
2435e5d3 1170
b5c19bd7 1171 *out_flags = 0;
a3985cdc 1172
b5c19bd7 1173 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
cc76b5cc 1174 "Pad findlex cv=0x%"UVxf" searching \"%.*s\" seq=%d%s\n",
4c760560 1175 PTR2UV(cv), (int)namelen, namepv, (int)seq,
cc76b5cc 1176 out_capture ? " capturing" : "" ));
dd2155a4 1177
b5c19bd7 1178 /* first, search this pad */
dd2155a4 1179
b5c19bd7
DM
1180 if (padlist) { /* not an undef CV */
1181 I32 fake_offset = 0;
86d2498c 1182 const AV * const nameav = PadlistARRAY(padlist)[0];
551405c4 1183 SV * const * const name_svp = AvARRAY(nameav);
ee6cee0c 1184
7db6405c 1185 for (offset = PadnamelistMAXNAMED(nameav); offset > 0; offset--) {
551405c4 1186 const SV * const namesv = name_svp[offset];
325e1816 1187 if (namesv && PadnameLEN(namesv) == namelen
e8b34487
BF
1188 && sv_eq_pvn_flags(aTHX_ namesv, namepv, namelen,
1189 flags & padadd_UTF8_NAME ? SVf_UTF8 : 0))
b5c19bd7 1190 {
6012dc80 1191 if (SvFAKE(namesv)) {
b5c19bd7 1192 fake_offset = offset; /* in case we don't find a real one */
6012dc80
DM
1193 continue;
1194 }
1195 /* is seq within the range _LOW to _HIGH ?
1196 * This is complicated by the fact that PL_cop_seqmax
1197 * may have wrapped around at some point */
1198 if (COP_SEQ_RANGE_LOW(namesv) == PERL_PADSEQ_INTRO)
1199 continue; /* not yet introduced */
1200
1201 if (COP_SEQ_RANGE_HIGH(namesv) == PERL_PADSEQ_INTRO) {
1202 /* in compiling scope */
1203 if (
1204 (seq > COP_SEQ_RANGE_LOW(namesv))
1205 ? (seq - COP_SEQ_RANGE_LOW(namesv) < (U32_MAX >> 1))
1206 : (COP_SEQ_RANGE_LOW(namesv) - seq > (U32_MAX >> 1))
1207 )
1208 break;
1209 }
1210 else if (
1211 (COP_SEQ_RANGE_LOW(namesv) > COP_SEQ_RANGE_HIGH(namesv))
1212 ?
1213 ( seq > COP_SEQ_RANGE_LOW(namesv)
1214 || seq <= COP_SEQ_RANGE_HIGH(namesv))
1215
1216 : ( seq > COP_SEQ_RANGE_LOW(namesv)
1217 && seq <= COP_SEQ_RANGE_HIGH(namesv))
1218 )
1219 break;
ee6cee0c
DM
1220 }
1221 }
1222
b5c19bd7
DM
1223 if (offset > 0 || fake_offset > 0 ) { /* a match! */
1224 if (offset > 0) { /* not fake */
1225 fake_offset = 0;
1226 *out_name_sv = name_svp[offset]; /* return the namesv */
1227
1228 /* set PAD_FAKELEX_MULTI if this lex can have multiple
1229 * instances. For now, we just test !CvUNIQUE(cv), but
1230 * ideally, we should detect my's declared within loops
1231 * etc - this would allow a wider range of 'not stayed
486ec47a 1232 * shared' warnings. We also treated already-compiled
b5c19bd7
DM
1233 * lexes as not multi as viewed from evals. */
1234
1235 *out_flags = CvANON(cv) ?
1236 PAD_FAKELEX_ANON :
1237 (!CvUNIQUE(cv) && ! CvCOMPILED(cv))
1238 ? PAD_FAKELEX_MULTI : 0;
1239
1240 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
809abb02
NC
1241 "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%lu,%lu)\n",
1242 PTR2UV(cv), (long)offset,
1243 (unsigned long)COP_SEQ_RANGE_LOW(*out_name_sv),
1244 (unsigned long)COP_SEQ_RANGE_HIGH(*out_name_sv)));
b5c19bd7
DM
1245 }
1246 else { /* fake match */
1247 offset = fake_offset;
1248 *out_name_sv = name_svp[offset]; /* return the namesv */
809abb02 1249 *out_flags = PARENT_FAKELEX_FLAGS(*out_name_sv);
b5c19bd7 1250 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
19a5c512 1251 "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n",
b5c19bd7 1252 PTR2UV(cv), (long)offset, (unsigned long)*out_flags,
809abb02 1253 (unsigned long) PARENT_PAD_INDEX(*out_name_sv)
b5c19bd7
DM
1254 ));
1255 }
dd2155a4 1256
b5c19bd7 1257 /* return the lex? */
dd2155a4 1258
b5c19bd7 1259 if (out_capture) {
dd2155a4 1260
b5c19bd7 1261 /* our ? */
00b1698f 1262 if (SvPAD_OUR(*out_name_sv)) {
a0714e2c 1263 *out_capture = NULL;
b5c19bd7
DM
1264 return offset;
1265 }
ee6cee0c 1266
b5c19bd7
DM
1267 /* trying to capture from an anon prototype? */
1268 if (CvCOMPILED(cv)
1269 ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv)
1270 : *out_flags & PAD_FAKELEX_ANON)
1271 {
a2a5de95 1272 if (warn)
445f13ff 1273 S_unavailable(aTHX_
0727928e
BF
1274 newSVpvn_flags(namepv, namelen,
1275 SVs_TEMP |
1276 (flags & padadd_UTF8_NAME ? SVf_UTF8 : 0)));
1277
a0714e2c 1278 *out_capture = NULL;
b5c19bd7 1279 }
ee6cee0c 1280
b5c19bd7
DM
1281 /* real value */
1282 else {
1283 int newwarn = warn;
1284 if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI)
d1186544 1285 && !SvPAD_STATE(name_svp[offset])
b5c19bd7
DM
1286 && warn && ckWARN(WARN_CLOSURE)) {
1287 newwarn = 0;
1288 Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
0727928e 1289 "Variable \"%"SVf"\" will not stay shared",
c1f6cd39 1290 SVfARG(newSVpvn_flags(namepv, namelen,
0727928e 1291 SVs_TEMP |
c1f6cd39 1292 (flags & padadd_UTF8_NAME ? SVf_UTF8 : 0))));
b5c19bd7 1293 }
dd2155a4 1294
b5c19bd7
DM
1295 if (fake_offset && CvANON(cv)
1296 && CvCLONE(cv) &&!CvCLONED(cv))
1297 {
1298 SV *n;
1299 /* not yet caught - look further up */
1300 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1301 "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n",
1302 PTR2UV(cv)));
1303 n = *out_name_sv;
fbb889c8 1304 (void) pad_findlex(namepv, namelen, flags, CvOUTSIDE(cv),
282e1742 1305 CvOUTSIDE_SEQ(cv),
b5c19bd7
DM
1306 newwarn, out_capture, out_name_sv, out_flags);
1307 *out_name_sv = n;
1308 return offset;
dd2155a4 1309 }
b5c19bd7 1310
86d2498c 1311 *out_capture = AvARRAY(PadlistARRAY(padlist)[
7261499d 1312 CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset];
b5c19bd7
DM
1313 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1314 "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n",
19a5c512 1315 PTR2UV(cv), PTR2UV(*out_capture)));
b5c19bd7 1316
d1186544 1317 if (SvPADSTALE(*out_capture)
7ef30830 1318 && (!CvDEPTH(cv) || !staleok)
d1186544
DM
1319 && !SvPAD_STATE(name_svp[offset]))
1320 {
445f13ff 1321 S_unavailable(aTHX_
0727928e
BF
1322 newSVpvn_flags(namepv, namelen,
1323 SVs_TEMP |
1324 (flags & padadd_UTF8_NAME ? SVf_UTF8 : 0)));
a0714e2c 1325 *out_capture = NULL;
dd2155a4
DM
1326 }
1327 }
b5c19bd7 1328 if (!*out_capture) {
cc76b5cc 1329 if (namelen != 0 && *namepv == '@')
ad64d0ec 1330 *out_capture = sv_2mortal(MUTABLE_SV(newAV()));
cc76b5cc 1331 else if (namelen != 0 && *namepv == '%')
ad64d0ec 1332 *out_capture = sv_2mortal(MUTABLE_SV(newHV()));
6d5c2147
FC
1333 else if (namelen != 0 && *namepv == '&')
1334 *out_capture = sv_2mortal(newSV_type(SVt_PVCV));
b5c19bd7
DM
1335 else
1336 *out_capture = sv_newmortal();
1337 }
dd2155a4 1338 }
b5c19bd7
DM
1339
1340 return offset;
ee6cee0c 1341 }
b5c19bd7
DM
1342 }
1343
1344 /* it's not in this pad - try above */
1345
1346 if (!CvOUTSIDE(cv))
1347 return NOT_IN_PAD;
9f7d9405 1348
b5c19bd7 1349 /* out_capture non-null means caller wants us to capture lex; in
71f882da 1350 * addition we capture ourselves unless it's an ANON/format */
b5c19bd7 1351 new_capturep = out_capture ? out_capture :
4608196e 1352 CvLATE(cv) ? NULL : &new_capture;
b5c19bd7 1353
7ef30830
FC
1354 offset = pad_findlex(namepv, namelen,
1355 flags | padadd_STALEOK*(new_capturep == &new_capture),
1356 CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1,
b5c19bd7 1357 new_capturep, out_name_sv, out_flags);
9f7d9405 1358 if ((PADOFFSET)offset == NOT_IN_PAD)
b5c19bd7 1359 return NOT_IN_PAD;
9f7d9405 1360
b5c19bd7
DM
1361 /* found in an outer CV. Add appropriate fake entry to this pad */
1362
1363 /* don't add new fake entries (via eval) to CVs that we have already
1364 * finished compiling, or to undef CVs */
1365 if (CvCOMPILED(cv) || !padlist)
1366 return 0; /* this dummy (and invalid) value isnt used by the caller */
1367
1368 {
3291825f 1369 /* This relies on sv_setsv_flags() upgrading the destination to the same
486ec47a 1370 type as the source, independent of the flags set, and on it being
3291825f
NC
1371 "good" and only copying flag bits and pointers that it understands.
1372 */
1373 SV *new_namesv = newSVsv(*out_name_sv);
53c1dcc0
AL
1374 AV * const ocomppad_name = PL_comppad_name;
1375 PAD * const ocomppad = PL_comppad;
86d2498c
FC
1376 PL_comppad_name = PadlistARRAY(padlist)[0];
1377 PL_comppad = PadlistARRAY(padlist)[1];
b5c19bd7
DM
1378 PL_curpad = AvARRAY(PL_comppad);
1379
3291825f 1380 new_offset
cc76b5cc 1381 = pad_alloc_name(new_namesv,
59cfed7d 1382 (SvPAD_STATE(*out_name_sv) ? padadd_STATE : 0),
3291825f
NC
1383 SvPAD_TYPED(*out_name_sv)
1384 ? SvSTASH(*out_name_sv) : NULL,
1385 SvOURSTASH(*out_name_sv)
1386 );
1387
1388 SvFAKE_on(new_namesv);
1389 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1390 "Pad addname: %ld \"%.*s\" FAKE\n",
1391 (long)new_offset,
1392 (int) SvCUR(new_namesv), SvPVX(new_namesv)));
809abb02 1393 PARENT_FAKELEX_FLAGS_set(new_namesv, *out_flags);
b5c19bd7 1394
809abb02 1395 PARENT_PAD_INDEX_set(new_namesv, 0);
00b1698f 1396 if (SvPAD_OUR(new_namesv)) {
6f207bd3 1397 NOOP; /* do nothing */
b5c19bd7 1398 }
71f882da 1399 else if (CvLATE(cv)) {
b5c19bd7 1400 /* delayed creation - just note the offset within parent pad */
809abb02 1401 PARENT_PAD_INDEX_set(new_namesv, offset);
b5c19bd7
DM
1402 CvCLONE_on(cv);
1403 }
1404 else {
1405 /* immediate creation - capture outer value right now */
1406 av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep));
81df9f6f
FC
1407 /* But also note the offset, as newMYSUB needs it */
1408 PARENT_PAD_INDEX_set(new_namesv, offset);
b5c19bd7
DM
1409 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1410 "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n",
1411 PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset));
dd2155a4 1412 }
b5c19bd7 1413 *out_name_sv = new_namesv;
809abb02 1414 *out_flags = PARENT_FAKELEX_FLAGS(new_namesv);
b5c19bd7
DM
1415
1416 PL_comppad_name = ocomppad_name;
1417 PL_comppad = ocomppad;
4608196e 1418 PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL;
dd2155a4 1419 }
b5c19bd7 1420 return new_offset;
dd2155a4
DM
1421}
1422
fb8a9836 1423#ifdef DEBUGGING
cc76b5cc 1424
dd2155a4 1425/*
cc76b5cc 1426=for apidoc Am|SV *|pad_sv|PADOFFSET po
dd2155a4 1427
cc76b5cc 1428Get the value at offset I<po> in the current (compiling or executing) pad.
dd2155a4
DM
1429Use macro PAD_SV instead of calling this function directly.
1430
1431=cut
1432*/
1433
dd2155a4
DM
1434SV *
1435Perl_pad_sv(pTHX_ PADOFFSET po)
1436{
f3548bdc 1437 ASSERT_CURPAD_ACTIVE("pad_sv");
dd2155a4 1438
dd2155a4
DM
1439 if (!po)
1440 Perl_croak(aTHX_ "panic: pad_sv po");
dd2155a4
DM
1441 DEBUG_X(PerlIO_printf(Perl_debug_log,
1442 "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n",
f3548bdc 1443 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po]))
dd2155a4
DM
1444 );
1445 return PL_curpad[po];
1446}
1447
dd2155a4 1448/*
cc76b5cc 1449=for apidoc Am|void|pad_setsv|PADOFFSET po|SV *sv
dd2155a4 1450
cc76b5cc 1451Set the value at offset I<po> in the current (compiling or executing) pad.
dd2155a4
DM
1452Use the macro PAD_SETSV() rather than calling this function directly.
1453
1454=cut
1455*/
1456
dd2155a4
DM
1457void
1458Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv)
1459{
7918f24d
NC
1460 PERL_ARGS_ASSERT_PAD_SETSV;
1461
f3548bdc 1462 ASSERT_CURPAD_ACTIVE("pad_setsv");
dd2155a4
DM
1463
1464 DEBUG_X(PerlIO_printf(Perl_debug_log,
1465 "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n",
f3548bdc 1466 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv))
dd2155a4
DM
1467 );
1468 PL_curpad[po] = sv;
1469}
dd2155a4 1470
cc76b5cc 1471#endif /* DEBUGGING */
dd2155a4
DM
1472
1473/*
cc76b5cc 1474=for apidoc m|void|pad_block_start|int full
dd2155a4 1475
e89fca5e 1476Update the pad compilation state variables on entry to a new block.
dd2155a4
DM
1477
1478=cut
1479*/
1480
1481/* XXX DAPM perhaps:
1482 * - integrate this in general state-saving routine ???
1483 * - combine with the state-saving going on in pad_new ???
1484 * - introduce a new SAVE type that does all this in one go ?
1485 */
1486
1487void
1488Perl_pad_block_start(pTHX_ int full)
1489{
f3548bdc 1490 ASSERT_CURPAD_ACTIVE("pad_block_start");
dd2155a4
DM
1491 SAVEI32(PL_comppad_name_floor);
1492 PL_comppad_name_floor = AvFILLp(PL_comppad_name);
1493 if (full)
1494 PL_comppad_name_fill = PL_comppad_name_floor;
1495 if (PL_comppad_name_floor < 0)
1496 PL_comppad_name_floor = 0;
1497 SAVEI32(PL_min_intro_pending);
1498 SAVEI32(PL_max_intro_pending);
1499 PL_min_intro_pending = 0;
1500 SAVEI32(PL_comppad_name_fill);
1501 SAVEI32(PL_padix_floor);
1780e744
FC
1502 /* PL_padix_floor is what PL_padix is reset to at the start of each
1503 statement, by pad_reset(). We set it when entering a new scope
1504 to keep things like this working:
1505 print "$foo$bar", do { this(); that() . "foo" };
1506 We must not let "$foo$bar" and the later concatenation share the
1507 same target. */
dd2155a4
DM
1508 PL_padix_floor = PL_padix;
1509 PL_pad_reset_pending = FALSE;
1510}
1511
dd2155a4 1512/*
cc76b5cc 1513=for apidoc m|U32|intro_my
dd2155a4 1514
bf954566
FC
1515"Introduce" my variables to visible status. This is called during parsing
1516at the end of each statement to make lexical variables visible to
1517subsequent statements.
dd2155a4
DM
1518
1519=cut
1520*/
1521
1522U32
1523Perl_intro_my(pTHX)
1524{
1525 SV **svp;
dd2155a4 1526 I32 i;
6012dc80 1527 U32 seq;
dd2155a4 1528
f3548bdc 1529 ASSERT_CURPAD_ACTIVE("intro_my");
dd2155a4
DM
1530 if (! PL_min_intro_pending)
1531 return PL_cop_seqmax;
1532
1533 svp = AvARRAY(PL_comppad_name);
1534 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
53c1dcc0
AL
1535 SV * const sv = svp[i];
1536
325e1816 1537 if (sv && PadnameLEN(sv) && !SvFAKE(sv)
0d311cdb
DM
1538 && COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO)
1539 {
2df5bdd7 1540 COP_SEQ_RANGE_HIGH_set(sv, PERL_PADSEQ_INTRO); /* Don't know scope end yet. */
809abb02 1541 COP_SEQ_RANGE_LOW_set(sv, PL_cop_seqmax);
dd2155a4 1542 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
809abb02 1543 "Pad intromy: %ld \"%s\", (%lu,%lu)\n",
b15aece3 1544 (long)i, SvPVX_const(sv),
809abb02
NC
1545 (unsigned long)COP_SEQ_RANGE_LOW(sv),
1546 (unsigned long)COP_SEQ_RANGE_HIGH(sv))
dd2155a4
DM
1547 );
1548 }
1549 }
6012dc80
DM
1550 seq = PL_cop_seqmax;
1551 PL_cop_seqmax++;
1552 if (PL_cop_seqmax == PERL_PADSEQ_INTRO) /* not a legal value */
1553 PL_cop_seqmax++;
dd2155a4
DM
1554 PL_min_intro_pending = 0;
1555 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
1556 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
6012dc80 1557 "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax)));
dd2155a4 1558
6012dc80 1559 return seq;
dd2155a4
DM
1560}
1561
1562/*
cc76b5cc 1563=for apidoc m|void|pad_leavemy
dd2155a4
DM
1564
1565Cleanup at end of scope during compilation: set the max seq number for
1566lexicals in this scope and warn of any lexicals that never got introduced.
1567
1568=cut
1569*/
1570
6d5c2147 1571OP *
dd2155a4
DM
1572Perl_pad_leavemy(pTHX)
1573{
1574 I32 off;
6d5c2147 1575 OP *o = NULL;
551405c4 1576 SV * const * const svp = AvARRAY(PL_comppad_name);
dd2155a4
DM
1577
1578 PL_pad_reset_pending = FALSE;
1579
f3548bdc 1580 ASSERT_CURPAD_ACTIVE("pad_leavemy");
dd2155a4
DM
1581 if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) {
1582 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
53c1dcc0 1583 const SV * const sv = svp[off];
325e1816 1584 if (sv && PadnameLEN(sv) && !SvFAKE(sv))
9b387841
NC
1585 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
1586 "%"SVf" never introduced",
1587 SVfARG(sv));
dd2155a4
DM
1588 }
1589 }
1590 /* "Deintroduce" my variables that are leaving with this scope. */
1591 for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) {
6d5c2147 1592 SV * const sv = svp[off];
325e1816 1593 if (sv && PadnameLEN(sv) && !SvFAKE(sv)
2df5bdd7
DM
1594 && COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO)
1595 {
809abb02 1596 COP_SEQ_RANGE_HIGH_set(sv, PL_cop_seqmax);
dd2155a4 1597 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
809abb02 1598 "Pad leavemy: %ld \"%s\", (%lu,%lu)\n",
b15aece3 1599 (long)off, SvPVX_const(sv),
809abb02
NC
1600 (unsigned long)COP_SEQ_RANGE_LOW(sv),
1601 (unsigned long)COP_SEQ_RANGE_HIGH(sv))
dd2155a4 1602 );
6d5c2147
FC
1603 if (!PadnameIsSTATE(sv) && !PadnameIsOUR(sv)
1604 && *PadnamePV(sv) == '&' && PadnameLEN(sv) > 1) {
1605 OP *kid = newOP(OP_INTROCV, 0);
1606 kid->op_targ = off;
1607 o = op_prepend_elem(OP_LINESEQ, kid, o);
1608 }
dd2155a4
DM
1609 }
1610 }
1611 PL_cop_seqmax++;
6012dc80
DM
1612 if (PL_cop_seqmax == PERL_PADSEQ_INTRO) /* not a legal value */
1613 PL_cop_seqmax++;
dd2155a4
DM
1614 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1615 "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax));
6d5c2147 1616 return o;
dd2155a4
DM
1617}
1618
dd2155a4 1619/*
cc76b5cc 1620=for apidoc m|void|pad_swipe|PADOFFSET po|bool refadjust
dd2155a4
DM
1621
1622Abandon the tmp in the current pad at offset po and replace with a
1623new one.
1624
1625=cut
1626*/
1627
1628void
1629Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust)
1630{
f3548bdc 1631 ASSERT_CURPAD_LEGAL("pad_swipe");
dd2155a4
DM
1632 if (!PL_curpad)
1633 return;
1634 if (AvARRAY(PL_comppad) != PL_curpad)
5637ef5b
NC
1635 Perl_croak(aTHX_ "panic: pad_swipe curpad, %p!=%p",
1636 AvARRAY(PL_comppad), PL_curpad);
9100eeb1
Z
1637 if (!po || ((SSize_t)po) > AvFILLp(PL_comppad))
1638 Perl_croak(aTHX_ "panic: pad_swipe po=%ld, fill=%ld",
1639 (long)po, (long)AvFILLp(PL_comppad));
dd2155a4
DM
1640
1641 DEBUG_X(PerlIO_printf(Perl_debug_log,
1642 "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n",
1643 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po));
1644
dd2155a4
DM
1645 if (refadjust)
1646 SvREFCNT_dec(PL_curpad[po]);
1647
9ad9869c
DM
1648
1649 /* if pad tmps aren't shared between ops, then there's no need to
1650 * create a new tmp when an existing op is freed */
53de1311 1651#ifdef USE_PAD_RESET
561b68a9 1652 PL_curpad[po] = newSV(0);
dd2155a4 1653 SvPADTMP_on(PL_curpad[po]);
9ad9869c 1654#else
ce0d59fd 1655 PL_curpad[po] = NULL;
97bf4a8d 1656#endif
325e1816 1657 if (PadnamelistMAX(PL_comppad_name) != -1
4891fdfa 1658 && (PADOFFSET)PadnamelistMAX(PL_comppad_name) >= po) {
ce0d59fd
FC
1659 if (PadnamelistARRAY(PL_comppad_name)[po]) {
1660 assert(!PadnameLEN(PadnamelistARRAY(PL_comppad_name)[po]));
1661 }
325e1816
FC
1662 PadnamelistARRAY(PL_comppad_name)[po] = &PL_sv_undef;
1663 }
b54c5e14
FC
1664 /* Use PL_constpadix here, not PL_padix. The latter may have been
1665 reset by pad_reset. We don’t want pad_alloc to have to scan the
1666 whole pad when allocating a constant. */
1667 if ((I32)po < PL_constpadix)
1668 PL_constpadix = po - 1;
dd2155a4
DM
1669}
1670
dd2155a4 1671/*
cc76b5cc 1672=for apidoc m|void|pad_reset
dd2155a4
DM
1673
1674Mark all the current temporaries for reuse
1675
1676=cut
1677*/
1678
1780e744
FC
1679/* pad_reset() causes pad temp TARGs (operator targets) to be shared
1680 * between OPs from different statements. During compilation, at the start
1681 * of each statement pad_reset resets PL_padix back to its previous value.
1682 * When allocating a target, pad_alloc begins its scan through the pad at
1683 * PL_padix+1. */
1f676739 1684static void
82af08ae 1685S_pad_reset(pTHX)
dd2155a4 1686{
53de1311 1687#ifdef USE_PAD_RESET
dd2155a4 1688 if (AvARRAY(PL_comppad) != PL_curpad)
5637ef5b
NC
1689 Perl_croak(aTHX_ "panic: pad_reset curpad, %p!=%p",
1690 AvARRAY(PL_comppad), PL_curpad);
dd2155a4
DM
1691
1692 DEBUG_X(PerlIO_printf(Perl_debug_log,
1693 "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld",
1694 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
1695 (long)PL_padix, (long)PL_padix_floor
1696 )
1697 );
1698
284167a5 1699 if (!TAINTING_get) { /* Can't mix tainted and non-tainted temporaries. */
dd2155a4
DM
1700 PL_padix = PL_padix_floor;
1701 }
1702#endif
1703 PL_pad_reset_pending = FALSE;
1704}
1705
dd2155a4 1706/*
cc76b5cc
Z
1707=for apidoc Amx|void|pad_tidy|padtidy_type type
1708
1709Tidy up a pad at the end of compilation of the code to which it belongs.
1710Jobs performed here are: remove most stuff from the pads of anonsub
1711prototypes; give it a @_; mark temporaries as such. I<type> indicates
1712the kind of subroutine:
dd2155a4 1713
cc76b5cc
Z
1714 padtidy_SUB ordinary subroutine
1715 padtidy_SUBCLONE prototype for lexical closure
1716 padtidy_FORMAT format
dd2155a4
DM
1717
1718=cut
1719*/
1720
1721/* XXX DAPM surely most of this stuff should be done properly
1722 * at the right time beforehand, rather than going around afterwards
1723 * cleaning up our mistakes ???
1724 */
1725
1726void
1727Perl_pad_tidy(pTHX_ padtidy_type type)
1728{
27da23d5 1729 dVAR;
dd2155a4 1730
f3548bdc 1731 ASSERT_CURPAD_ACTIVE("pad_tidy");
b5c19bd7 1732
db21619c
DM
1733 /* If this CV has had any 'eval-capable' ops planted in it:
1734 * i.e. it contains any of:
1735 *
1736 * * eval '...',
1737 * * //ee,
1738 * * use re 'eval'; /$var/
1739 * * /(?{..})/),
1740 *
1741 * Then any anon prototypes in the chain of CVs should be marked as
1742 * cloneable, so that for example the eval's CV in
1743 *
1744 * sub { eval '$x' }
1745 *
1746 * gets the right CvOUTSIDE. If running with -d, *any* sub may
1747 * potentially have an eval executed within it.
b5c19bd7
DM
1748 */
1749
1750 if (PL_cv_has_eval || PL_perldb) {
e1ec3a88 1751 const CV *cv;
b5c19bd7
DM
1752 for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) {
1753 if (cv != PL_compcv && CvCOMPILED(cv))
1754 break; /* no need to mark already-compiled code */
1755 if (CvANON(cv)) {
1756 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1757 "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv)));
1758 CvCLONE_on(cv);
1759 }
00cc8743 1760 CvHASEVAL_on(cv);
b5c19bd7
DM
1761 }
1762 }
1763
eb8137a9 1764 /* extend namepad to match curpad */
dd2155a4 1765 if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad))
a0714e2c 1766 av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL);
dd2155a4
DM
1767
1768 if (type == padtidy_SUBCLONE) {
ce0d59fd 1769 SV ** const namep = AvARRAY(PL_comppad_name);
504618e9 1770 PADOFFSET ix;
b5c19bd7 1771
dd2155a4
DM
1772 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1773 SV *namesv;
ce0d59fd 1774 if (!namep[ix]) namep[ix] = &PL_sv_undef;
dd2155a4 1775
dd2155a4
DM
1776 /*
1777 * The only things that a clonable function needs in its
3a6ce63a 1778 * pad are anonymous subs, constants and GVs.
dd2155a4
DM
1779 * The rest are created anew during cloning.
1780 */
ce0d59fd
FC
1781 if (!PL_curpad[ix] || SvIMMORTAL(PL_curpad[ix])
1782 || IS_PADGV(PL_curpad[ix]))
3a6ce63a 1783 continue;
ce0d59fd
FC
1784 namesv = namep[ix];
1785 if (!(PadnamePV(namesv) &&
3a6ce63a 1786 (!PadnameLEN(namesv) || *SvPVX_const(namesv) == '&')))
dd2155a4
DM
1787 {
1788 SvREFCNT_dec(PL_curpad[ix]);
a0714e2c 1789 PL_curpad[ix] = NULL;
dd2155a4
DM
1790 }
1791 }
1792 }
1793 else if (type == padtidy_SUB) {
1794 /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */
53c1dcc0 1795 AV * const av = newAV(); /* Will be @_ */
ad64d0ec 1796 av_store(PL_comppad, 0, MUTABLE_SV(av));
11ca45c0 1797 AvREIFY_only(av);
dd2155a4
DM
1798 }
1799
4cee4ca8 1800 if (type == padtidy_SUB || type == padtidy_FORMAT) {
ce0d59fd 1801 SV ** const namep = AvARRAY(PL_comppad_name);
504618e9 1802 PADOFFSET ix;
dd2155a4 1803 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
ce0d59fd
FC
1804 if (!namep[ix]) namep[ix] = &PL_sv_undef;
1805 if (!PL_curpad[ix] || SvIMMORTAL(PL_curpad[ix])
1806 || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix]))
dd2155a4 1807 continue;
e52eb89d 1808 if (SvPADMY(PL_curpad[ix]) && !SvFAKE(namep[ix])) {
adf8f095
NC
1809 /* This is a work around for how the current implementation of
1810 ?{ } blocks in regexps interacts with lexicals.
1811
1812 One of our lexicals.
1813 Can't do this on all lexicals, otherwise sub baz() won't
1814 compile in
1815
1816 my $foo;
1817
1818 sub bar { ++$foo; }
1819
1820 sub baz { ++$foo; }
1821
1822 because completion of compiling &bar calling pad_tidy()
1823 would cause (top level) $foo to be marked as stale, and
1824 "no longer available". */
1825 SvPADSTALE_on(PL_curpad[ix]);
1826 }
dd2155a4
DM
1827 }
1828 }
f3548bdc 1829 PL_curpad = AvARRAY(PL_comppad);
dd2155a4
DM
1830}
1831
dd2155a4 1832/*
cc76b5cc 1833=for apidoc m|void|pad_free|PADOFFSET po
dd2155a4 1834
8627550a 1835Free the SV at offset po in the current pad.
dd2155a4
DM
1836
1837=cut
1838*/
1839
1840/* XXX DAPM integrate with pad_swipe ???? */
1841void
1842Perl_pad_free(pTHX_ PADOFFSET po)
1843{
53de1311 1844#ifndef USE_PAD_RESET
ad9e6ae1 1845 SV *sv;
ff06c6b2 1846#endif
f3548bdc 1847 ASSERT_CURPAD_LEGAL("pad_free");
dd2155a4
DM
1848 if (!PL_curpad)
1849 return;
1850 if (AvARRAY(PL_comppad) != PL_curpad)
5637ef5b
NC
1851 Perl_croak(aTHX_ "panic: pad_free curpad, %p!=%p",
1852 AvARRAY(PL_comppad), PL_curpad);
dd2155a4
DM
1853 if (!po)
1854 Perl_croak(aTHX_ "panic: pad_free po");
1855
1856 DEBUG_X(PerlIO_printf(Perl_debug_log,
1857 "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n",
1858 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)
1859 );
1860
53de1311 1861#ifndef USE_PAD_RESET
ad9e6ae1
DM
1862 sv = PL_curpad[po];
1863 if (sv && sv != &PL_sv_undef && !SvPADMY(sv))
1864 SvFLAGS(sv) &= ~SVs_PADTMP;
1865
dd2155a4
DM
1866 if ((I32)po < PL_padix)
1867 PL_padix = po - 1;
53d3c048 1868#endif
dd2155a4
DM
1869}
1870
dd2155a4 1871/*
cc76b5cc 1872=for apidoc m|void|do_dump_pad|I32 level|PerlIO *file|PADLIST *padlist|int full
dd2155a4
DM
1873
1874Dump the contents of a padlist
1875
1876=cut
1877*/
1878
1879void
1880Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full)
1881{
e1ec3a88
AL
1882 const AV *pad_name;
1883 const AV *pad;
dd2155a4
DM
1884 SV **pname;
1885 SV **ppad;
dd2155a4
DM
1886 I32 ix;
1887
7918f24d
NC
1888 PERL_ARGS_ASSERT_DO_DUMP_PAD;
1889
dd2155a4
DM
1890 if (!padlist) {
1891 return;
1892 }
86d2498c
FC
1893 pad_name = *PadlistARRAY(padlist);
1894 pad = PadlistARRAY(padlist)[1];
dd2155a4
DM
1895 pname = AvARRAY(pad_name);
1896 ppad = AvARRAY(pad);
1897 Perl_dump_indent(aTHX_ level, file,
1898 "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n",
1899 PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad)
1900 );
1901
1902 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
e1ec3a88 1903 const SV *namesv = pname[ix];
325e1816 1904 if (namesv && !PadnameLEN(namesv)) {
a0714e2c 1905 namesv = NULL;
dd2155a4
DM
1906 }
1907 if (namesv) {
ee6cee0c
DM
1908 if (SvFAKE(namesv))
1909 Perl_dump_indent(aTHX_ level+1, file,
c0fd1b42 1910 "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n",
ee6cee0c
DM
1911 (int) ix,
1912 PTR2UV(ppad[ix]),
1913 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
b15aece3 1914 SvPVX_const(namesv),
809abb02
NC
1915 (unsigned long)PARENT_FAKELEX_FLAGS(namesv),
1916 (unsigned long)PARENT_PAD_INDEX(namesv)
b5c19bd7 1917
ee6cee0c
DM
1918 );
1919 else
1920 Perl_dump_indent(aTHX_ level+1, file,
809abb02 1921 "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n",
ee6cee0c
DM
1922 (int) ix,
1923 PTR2UV(ppad[ix]),
1924 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
809abb02
NC
1925 (unsigned long)COP_SEQ_RANGE_LOW(namesv),
1926 (unsigned long)COP_SEQ_RANGE_HIGH(namesv),
b15aece3 1927 SvPVX_const(namesv)
ee6cee0c 1928 );
dd2155a4
DM
1929 }
1930 else if (full) {
1931 Perl_dump_indent(aTHX_ level+1, file,
1932 "%2d. 0x%"UVxf"<%lu>\n",
1933 (int) ix,
1934 PTR2UV(ppad[ix]),
1935 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0)
1936 );
1937 }
1938 }
1939}
1940
cc76b5cc 1941#ifdef DEBUGGING
dd2155a4
DM
1942
1943/*
cc76b5cc 1944=for apidoc m|void|cv_dump|CV *cv|const char *title
dd2155a4
DM
1945
1946dump the contents of a CV
1947
1948=cut
1949*/
1950
dd2155a4 1951STATIC void
e1ec3a88 1952S_cv_dump(pTHX_ const CV *cv, const char *title)
dd2155a4 1953{
53c1dcc0 1954 const CV * const outside = CvOUTSIDE(cv);
b70d5558 1955 PADLIST* const padlist = CvPADLIST(cv);
dd2155a4 1956
7918f24d
NC
1957 PERL_ARGS_ASSERT_CV_DUMP;
1958
dd2155a4
DM
1959 PerlIO_printf(Perl_debug_log,
1960 " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n",
1961 title,
1962 PTR2UV(cv),
1963 (CvANON(cv) ? "ANON"
71f882da 1964 : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT"
dd2155a4
DM
1965 : (cv == PL_main_cv) ? "MAIN"
1966 : CvUNIQUE(cv) ? "UNIQUE"
1967 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
1968 PTR2UV(outside),
1969 (!outside ? "null"
1970 : CvANON(outside) ? "ANON"
1971 : (outside == PL_main_cv) ? "MAIN"
1972 : CvUNIQUE(outside) ? "UNIQUE"
1973 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
1974
1975 PerlIO_printf(Perl_debug_log,
1976 " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist));
1977 do_dump_pad(1, Perl_debug_log, padlist, 1);
1978}
dd2155a4 1979
cc76b5cc 1980#endif /* DEBUGGING */
dd2155a4
DM
1981
1982/*
cc76b5cc 1983=for apidoc Am|CV *|cv_clone|CV *proto
dd2155a4 1984
cc76b5cc
Z
1985Clone a CV, making a lexical closure. I<proto> supplies the prototype
1986of the function: its code, pad structure, and other attributes.
1987The prototype is combined with a capture of outer lexicals to which the
1988code refers, which are taken from the currently-executing instance of
1989the immediately surrounding code.
dd2155a4
DM
1990
1991=cut
1992*/
1993
e10681aa
FC
1994static CV *S_cv_clone(pTHX_ CV *proto, CV *cv, CV *outside);
1995
1996static void
5fab0186 1997S_cv_clone_pad(pTHX_ CV *proto, CV *cv, CV *outside, bool newcv)
dd2155a4 1998{
dd2155a4 1999 I32 ix;
b70d5558 2000 PADLIST* const protopadlist = CvPADLIST(proto);
9ef8d569 2001 PAD *const protopad_name = *PadlistARRAY(protopadlist);
86d2498c 2002 const PAD *const protopad = PadlistARRAY(protopadlist)[1];
53c1dcc0
AL
2003 SV** const pname = AvARRAY(protopad_name);
2004 SV** const ppad = AvARRAY(protopad);
e1ec3a88
AL
2005 const I32 fname = AvFILLp(protopad_name);
2006 const I32 fpad = AvFILLp(protopad);
b5c19bd7 2007 SV** outpad;
71f882da 2008 long depth;
e07561e6 2009 bool subclones = FALSE;
7918f24d 2010
dd2155a4
DM
2011 assert(!CvUNIQUE(proto));
2012
1b5aaca6
FC
2013 /* Anonymous subs have a weak CvOUTSIDE pointer, so its value is not
2014 * reliable. The currently-running sub is always the one we need to
2015 * close over.
8d88fe29
FC
2016 * For my subs, the currently-running sub may not be the one we want.
2017 * We have to check whether it is a clone of CvOUTSIDE.
1b5aaca6
FC
2018 * Note that in general for formats, CvOUTSIDE != find_runcv.
2019 * Since formats may be nested inside closures, CvOUTSIDE may point
71f882da 2020 * to a prototype; we instead want the cloned parent who called us.
af41786f 2021 */
71f882da 2022
e07561e6 2023 if (!outside) {
ebfebee4 2024 if (CvWEAKOUTSIDE(proto))
71f882da 2025 outside = find_runcv(NULL);
e07561e6 2026 else {
af41786f 2027 outside = CvOUTSIDE(proto);
db4cf31d
FC
2028 if ((CvCLONE(outside) && ! CvCLONED(outside))
2029 || !CvPADLIST(outside)
8771da69
FC
2030 || PadlistNAMES(CvPADLIST(outside))
2031 != protopadlist->xpadl_outid) {
db4cf31d 2032 outside = find_runcv_where(
a56015b9 2033 FIND_RUNCV_padid_eq, PTR2IV(protopadlist->xpadl_outid), NULL
70794f7b 2034 );
db4cf31d 2035 /* outside could be null */
5dff782d 2036 }
e07561e6 2037 }
5dff782d 2038 }
db4cf31d 2039 depth = outside ? CvDEPTH(outside) : 0;
71f882da
DM
2040 if (!depth)
2041 depth = 1;
b5c19bd7 2042
dd2155a4
DM
2043 ENTER;
2044 SAVESPTR(PL_compcv);
e07561e6 2045 PL_compcv = cv;
5fab0186 2046 if (newcv) SAVEFREESV(cv); /* in case of fatal warnings */
dd2155a4 2047
a0d2bbd5
FC
2048 if (CvHASEVAL(cv))
2049 CvOUTSIDE(cv) = MUTABLE_CV(SvREFCNT_inc_simple(outside));
dd2155a4 2050
cbacc9aa 2051 SAVESPTR(PL_comppad_name);
9ef8d569 2052 PL_comppad_name = protopad_name;
b7787f18 2053 CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE);
dd2155a4 2054
b5c19bd7 2055 av_fill(PL_comppad, fpad);
dd2155a4 2056
dd2155a4
DM
2057 PL_curpad = AvARRAY(PL_comppad);
2058
db4cf31d 2059 outpad = outside && CvPADLIST(outside)
86d2498c 2060 ? AvARRAY(PadlistARRAY(CvPADLIST(outside))[depth])
f2ead8b8 2061 : NULL;
8771da69
FC
2062 if (outpad)
2063 CvPADLIST(cv)->xpadl_outid = PadlistNAMES(CvPADLIST(outside));
b5c19bd7 2064
dd2155a4 2065 for (ix = fpad; ix > 0; ix--) {
a0714e2c
SS
2066 SV* const namesv = (ix <= fname) ? pname[ix] : NULL;
2067 SV *sv = NULL;
325e1816 2068 if (namesv && PadnameLEN(namesv)) { /* lexical */
f2047bf1
FC
2069 if (PadnameIsOUR(namesv)) { /* or maybe not so lexical */
2070 NOOP;
2071 }
2072 else {
b5c19bd7 2073 if (SvFAKE(namesv)) { /* lexical from outside? */
5aec98df
FC
2074 /* formats may have an inactive, or even undefined, parent;
2075 but state vars are always available. */
f2ead8b8 2076 if (!outpad || !(sv = outpad[PARENT_PAD_INDEX(namesv)])
cae5dbbe 2077 || ( SvPADSTALE(sv) && !SvPAD_STATE(namesv)
db4cf31d 2078 && (!outside || !CvDEPTH(outside))) ) {
445f13ff 2079 S_unavailable(aTHX_ namesv);
a0714e2c 2080 sv = NULL;
71f882da 2081 }
33894c1a 2082 else
f84c484e 2083 SvREFCNT_inc_simple_void_NN(sv);
dd2155a4 2084 }
71f882da 2085 if (!sv) {
b15aece3 2086 const char sigil = SvPVX_const(namesv)[0];
e1ec3a88 2087 if (sigil == '&')
e07561e6
FC
2088 /* If there are state subs, we need to clone them, too.
2089 But they may need to close over variables we have
2090 not cloned yet. So we will have to do a second
2091 pass. Furthermore, there may be state subs clos-
2092 ing over other state subs’ entries, so we have
2093 to put a stub here and then clone into it on the
2094 second pass. */
6d5c2147
FC
2095 if (SvPAD_STATE(namesv) && !CvCLONED(ppad[ix])) {
2096 assert(SvTYPE(ppad[ix]) == SVt_PVCV);
2097 subclones = 1;
2098 sv = newSV_type(SVt_PVCV);
f3feca7a 2099 CvLEXICAL_on(sv);
6d5c2147
FC
2100 }
2101 else if (PadnameLEN(namesv)>1 && !PadnameIsOUR(namesv))
2102 {
2103 /* my sub */
81df9f6f
FC
2104 /* Just provide a stub, but name it. It will be
2105 upgrade to the real thing on scope entry. */
f7cf2d13 2106 dVAR;
e1588866
FC
2107 U32 hash;
2108 PERL_HASH(hash, SvPVX_const(namesv)+1,
2109 SvCUR(namesv) - 1);
81df9f6f 2110 sv = newSV_type(SVt_PVCV);
cf748c3c
FC
2111 CvNAME_HEK_set(
2112 sv,
2113 share_hek(SvPVX_const(namesv)+1,
2114 SvCUR(namesv) - 1
2115 * (SvUTF8(namesv) ? -1 : 1),
e1588866 2116 hash)
cf748c3c 2117 );
f3feca7a 2118 CvLEXICAL_on(sv);
6d5c2147
FC
2119 }
2120 else sv = SvREFCNT_inc(ppad[ix]);
e1ec3a88 2121 else if (sigil == '@')
ad64d0ec 2122 sv = MUTABLE_SV(newAV());
e1ec3a88 2123 else if (sigil == '%')
ad64d0ec 2124 sv = MUTABLE_SV(newHV());
dd2155a4 2125 else
561b68a9 2126 sv = newSV(0);
235cc2e3 2127 SvPADMY_on(sv);
0d3b281c 2128 /* reset the 'assign only once' flag on each state var */
e07561e6 2129 if (sigil != '&' && SvPAD_STATE(namesv))
0d3b281c 2130 SvPADSTALE_on(sv);
dd2155a4 2131 }
f2047bf1 2132 }
dd2155a4 2133 }
3a6ce63a 2134 else if (IS_PADGV(ppad[ix]) || (namesv && PadnamePV(namesv))) {
f84c484e 2135 sv = SvREFCNT_inc_NN(ppad[ix]);
dd2155a4
DM
2136 }
2137 else {
561b68a9 2138 sv = newSV(0);
dd2155a4 2139 SvPADTMP_on(sv);
dd2155a4 2140 }
71f882da 2141 PL_curpad[ix] = sv;
dd2155a4
DM
2142 }
2143
e07561e6
FC
2144 if (subclones)
2145 for (ix = fpad; ix > 0; ix--) {
2146 SV* const namesv = (ix <= fname) ? pname[ix] : NULL;
2147 if (namesv && namesv != &PL_sv_undef && !SvFAKE(namesv)
2148 && SvPVX_const(namesv)[0] == '&' && SvPAD_STATE(namesv))
2149 S_cv_clone(aTHX_ (CV *)ppad[ix], (CV *)PL_curpad[ix], cv);
2150 }
2151
5fab0186 2152 if (newcv) SvREFCNT_inc_simple_void_NN(cv);
e10681aa
FC
2153 LEAVE;
2154}
2155
2156static CV *
2157S_cv_clone(pTHX_ CV *proto, CV *cv, CV *outside)
2158{
20b7effb 2159#ifdef USE_ITHREADS
c04ef36e 2160 dVAR;
20b7effb 2161#endif
5fab0186 2162 const bool newcv = !cv;
c04ef36e 2163
e10681aa
FC
2164 assert(!CvUNIQUE(proto));
2165
2166 if (!cv) cv = MUTABLE_CV(newSV_type(SvTYPE(proto)));
2167 CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE|CVf_CVGV_RC
2168 |CVf_SLABBED);
2169 CvCLONED_on(cv);
2170
2171 CvFILE(cv) = CvDYNFILE(proto) ? savepv(CvFILE(proto))
2172 : CvFILE(proto);
2173 if (CvNAMED(proto))
2e800d79 2174 CvNAME_HEK_set(cv, share_hek_hek(CvNAME_HEK(proto)));
e10681aa
FC
2175 else CvGV_set(cv,CvGV(proto));
2176 CvSTASH_set(cv, CvSTASH(proto));
2177 OP_REFCNT_LOCK;
2178 CvROOT(cv) = OpREFCNT_inc(CvROOT(proto));
2179 OP_REFCNT_UNLOCK;
2180 CvSTART(cv) = CvSTART(proto);
2181 CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto);
2182
fdf416b6 2183 if (SvPOK(proto)) {
e10681aa 2184 sv_setpvn(MUTABLE_SV(cv), SvPVX_const(proto), SvCUR(proto));
fdf416b6
BF
2185 if (SvUTF8(proto))
2186 SvUTF8_on(MUTABLE_SV(cv));
2187 }
e10681aa
FC
2188 if (SvMAGIC(proto))
2189 mg_copy((SV *)proto, (SV *)cv, 0, 0);
2190
5fab0186 2191 if (CvPADLIST(proto)) S_cv_clone_pad(aTHX_ proto, cv, outside, newcv);
e10681aa 2192
dd2155a4
DM
2193 DEBUG_Xv(
2194 PerlIO_printf(Perl_debug_log, "\nPad CV clone\n");
e10681aa 2195 if (CvOUTSIDE(cv)) cv_dump(CvOUTSIDE(cv), "Outside");
dd2155a4
DM
2196 cv_dump(proto, "Proto");
2197 cv_dump(cv, "To");
2198 );
2199
d3f8a934
AB
2200 if (CvCONST(cv)) {
2201 /* Constant sub () { $x } closing over $x - see lib/constant.pm:
2202 * The prototype was marked as a candiate for const-ization,
2203 * so try to grab the current const value, and if successful,
2204 * turn into a const sub:
2205 */
2206 SV* const const_sv = op_const_sv(CvSTART(cv), cv);
2207 if (const_sv) {
2208 SvREFCNT_dec_NN(cv);
2209 /* For this calling case, op_const_sv returns a *copy*, which we
2210 donate to newCONSTSUB. Yes, this is ugly, and should be killed.
2211 Need to fix how lib/constant.pm works to eliminate this. */
2212 cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv);
2213 }
2214 else {
2215 CvCONST_off(cv);
2216 }
2217 }
2218
dd2155a4
DM
2219 return cv;
2220}
2221
e07561e6
FC
2222CV *
2223Perl_cv_clone(pTHX_ CV *proto)
2224{
2225 PERL_ARGS_ASSERT_CV_CLONE;
2226
fead5351 2227 if (!CvPADLIST(proto)) Perl_croak(aTHX_ "panic: no pad in cv_clone");
e07561e6
FC
2228 return S_cv_clone(aTHX_ proto, NULL, NULL);
2229}
2230
6d5c2147
FC
2231/* Called only by pp_clonecv */
2232CV *
2233Perl_cv_clone_into(pTHX_ CV *proto, CV *target)
2234{
2235 PERL_ARGS_ASSERT_CV_CLONE_INTO;
2236 cv_undef(target);
2237 return S_cv_clone(aTHX_ proto, target, NULL);
2238}
2239
fb094047
FC
2240/*
2241=for apidoc cv_name
2242
2243Returns an SV containing the name of the CV, mainly for use in error
2244reporting. The CV may actually be a GV instead, in which case the returned
7a275a2e
FC
2245SV holds the GV's name. Anything other than a GV or CV is treated as a
2246string already holding the sub name, but this could change in the future.
fb094047
FC
2247
2248An SV may be passed as a second argument. If so, the name will be assigned
2249to it and it will be returned. Otherwise the returned SV will be a new
2250mortal.
2251
2252=cut
2253*/
2254
c5569a55
FC
2255SV *
2256Perl_cv_name(pTHX_ CV *cv, SV *sv)
2257{
2258 PERL_ARGS_ASSERT_CV_NAME;
2259 if (!isGV_with_GP(cv) && SvTYPE(cv) != SVt_PVCV) {
2260 if (sv) sv_setsv(sv,(SV *)cv);
2261 return sv ? (sv) : (SV *)cv;
2262 }
2263 {
f3fb6cf3 2264 SV * const retsv = sv ? (sv) : sv_newmortal();
c5569a55
FC
2265 if (SvTYPE(cv) == SVt_PVCV) {
2266 if (CvNAMED(cv)) {
2267 if (CvLEXICAL(cv)) sv_sethek(retsv, CvNAME_HEK(cv));
2268 else {
2269 sv_sethek(retsv, HvNAME_HEK(CvSTASH(cv)));
2270 sv_catpvs(retsv, "::");
f34d8cdd 2271 sv_cathek(retsv, CvNAME_HEK(cv));
c5569a55
FC
2272 }
2273 }
2274 else if (CvLEXICAL(cv))
2275 sv_sethek(retsv, GvNAME_HEK(GvEGV(CvGV(cv))));
2276 else gv_efullname3(retsv, CvGV(cv), NULL);
2277 }
2278 else gv_efullname3(retsv,(GV *)cv,NULL);
2279 return retsv;
2280 }
2281}
2282
dd2155a4 2283/*
cc76b5cc 2284=for apidoc m|void|pad_fixup_inner_anons|PADLIST *padlist|CV *old_cv|CV *new_cv
dd2155a4
DM
2285
2286For any anon CVs in the pad, change CvOUTSIDE of that CV from
72d33970 2287old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be
7dafbf52 2288moved to a pre-existing CV struct.
dd2155a4
DM
2289
2290=cut
2291*/
2292
2293void
2294Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv)
2295{
2296 I32 ix;
86d2498c
FC
2297 AV * const comppad_name = PadlistARRAY(padlist)[0];
2298 AV * const comppad = PadlistARRAY(padlist)[1];
53c1dcc0
AL
2299 SV ** const namepad = AvARRAY(comppad_name);
2300 SV ** const curpad = AvARRAY(comppad);
7918f24d
NC
2301
2302 PERL_ARGS_ASSERT_PAD_FIXUP_INNER_ANONS;
294a48e9
AL
2303 PERL_UNUSED_ARG(old_cv);
2304
dd2155a4 2305 for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
551405c4 2306 const SV * const namesv = namepad[ix];
09a30bc4 2307 if (namesv && namesv != &PL_sv_undef && !SvPAD_STATE(namesv)
b15aece3 2308 && *SvPVX_const(namesv) == '&')
dd2155a4 2309 {
e09ac076 2310 if (SvTYPE(curpad[ix]) == SVt_PVCV) {
0afba48f
FC
2311 MAGIC * const mg =
2312 SvMAGICAL(curpad[ix])
2313 ? mg_find(curpad[ix], PERL_MAGIC_proto)
2314 : NULL;
2315 CV * const innercv = MUTABLE_CV(mg ? mg->mg_obj : curpad[ix]);
2316 if (CvOUTSIDE(innercv) == old_cv) {
1f122f9b
FC
2317 if (!CvWEAKOUTSIDE(innercv)) {
2318 SvREFCNT_dec(old_cv);
2319 SvREFCNT_inc_simple_void_NN(new_cv);
2320 }
0afba48f
FC
2321 CvOUTSIDE(innercv) = new_cv;
2322 }
e09ac076
FC
2323 }
2324 else { /* format reference */
2325 SV * const rv = curpad[ix];
2326 CV *innercv;
2327 if (!SvOK(rv)) continue;
2328 assert(SvROK(rv));
2329 assert(SvWEAKREF(rv));
2330 innercv = (CV *)SvRV(rv);
2331 assert(!CvWEAKOUTSIDE(innercv));
2332 SvREFCNT_dec(CvOUTSIDE(innercv));
2333 CvOUTSIDE(innercv) = (CV *)SvREFCNT_inc_simple_NN(new_cv);
2334 }
dd2155a4
DM
2335 }
2336 }
2337}
2338
2339/*
cc76b5cc 2340=for apidoc m|void|pad_push|PADLIST *padlist|int depth
dd2155a4
DM
2341
2342Push a new pad frame onto the padlist, unless there's already a pad at
26019298
AL
2343this depth, in which case don't bother creating a new one. Then give
2344the new pad an @_ in slot zero.
dd2155a4
DM
2345
2346=cut
2347*/
2348
2349void
26019298 2350Perl_pad_push(pTHX_ PADLIST *padlist, int depth)
dd2155a4 2351{
7918f24d
NC
2352 PERL_ARGS_ASSERT_PAD_PUSH;
2353
86d2498c
FC
2354 if (depth > PadlistMAX(padlist) || !PadlistARRAY(padlist)[depth]) {
2355 PAD** const svp = PadlistARRAY(padlist);
44f8325f
AL
2356 AV* const newpad = newAV();
2357 SV** const oldpad = AvARRAY(svp[depth-1]);
502c6561
NC
2358 I32 ix = AvFILLp((const AV *)svp[1]);
2359 const I32 names_fill = AvFILLp((const AV *)svp[0]);
44f8325f 2360 SV** const names = AvARRAY(svp[0]);
26019298
AL
2361 AV *av;
2362
dd2155a4 2363 for ( ;ix > 0; ix--) {
325e1816 2364 if (names_fill >= ix && PadnameLEN(names[ix])) {
b15aece3 2365 const char sigil = SvPVX_const(names[ix])[0];
fda94784
RGS
2366 if ((SvFLAGS(names[ix]) & SVf_FAKE)
2367 || (SvFLAGS(names[ix]) & SVpad_STATE)
2368 || sigil == '&')
2369 {
dd2155a4
DM
2370 /* outer lexical or anon code */
2371 av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
2372 }
2373 else { /* our own lexical */
26019298
AL
2374 SV *sv;
2375 if (sigil == '@')
ad64d0ec 2376 sv = MUTABLE_SV(newAV());
26019298 2377 else if (sigil == '%')
ad64d0ec 2378 sv = MUTABLE_SV(newHV());
dd2155a4 2379 else
561b68a9 2380 sv = newSV(0);
26019298 2381 av_store(newpad, ix, sv);
dd2155a4
DM
2382 SvPADMY_on(sv);
2383 }
2384 }
5d719198 2385 else if (IS_PADGV(oldpad[ix]) || PadnamePV(names[ix])) {
f84c484e 2386 av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix]));
dd2155a4
DM
2387 }
2388 else {
2389 /* save temporaries on recursion? */
561b68a9 2390 SV * const sv = newSV(0);
26019298 2391 av_store(newpad, ix, sv);
dd2155a4
DM
2392 SvPADTMP_on(sv);
2393 }
2394 }
26019298 2395 av = newAV();
ad64d0ec 2396 av_store(newpad, 0, MUTABLE_SV(av));
11ca45c0 2397 AvREIFY_only(av);
26019298 2398
7261499d 2399 padlist_store(padlist, depth, newpad);
dd2155a4
DM
2400 }
2401}
b21dc031 2402
cc76b5cc
Z
2403/*
2404=for apidoc Am|HV *|pad_compname_type|PADOFFSET po
2405
2406Looks up the type of the lexical variable at position I<po> in the
2407currently-compiling pad. If the variable is typed, the stash of the
2408class to which it is typed is returned. If not, C<NULL> is returned.
2409
2410=cut
2411*/
b21dc031
AL
2412
2413HV *
2414Perl_pad_compname_type(pTHX_ const PADOFFSET po)
2415{
3769e90d
DD
2416 SV* const av = PAD_COMPNAME_SV(po);
2417 if ( SvPAD_TYPED(av) ) {
2418 return SvSTASH(av);
b21dc031 2419 }
5c284bb0 2420 return NULL;
b21dc031 2421}
66610fdd 2422
d5b1589c
NC
2423#if defined(USE_ITHREADS)
2424
2425# define av_dup_inc(s,t) MUTABLE_AV(sv_dup_inc((const SV *)s,t))
2426
cc76b5cc 2427/*
b70d5558 2428=for apidoc padlist_dup
cc76b5cc
Z
2429
2430Duplicates a pad.
2431
2432=cut
2433*/
2434
b70d5558
FC
2435PADLIST *
2436Perl_padlist_dup(pTHX_ PADLIST *srcpad, CLONE_PARAMS *param)
d5b1589c 2437{
7261499d
FC
2438 PADLIST *dstpad;
2439 bool cloneall;
2440 PADOFFSET max;
2441
d5b1589c
NC
2442 PERL_ARGS_ASSERT_PADLIST_DUP;
2443
2444 if (!srcpad)
2445 return NULL;
2446
7261499d 2447 cloneall = param->flags & CLONEf_COPY_STACKS
86d2498c
FC
2448 || SvREFCNT(PadlistARRAY(srcpad)[1]) > 1;
2449 assert (SvREFCNT(PadlistARRAY(srcpad)[1]) == 1);
7261499d 2450
86d2498c 2451 max = cloneall ? PadlistMAX(srcpad) : 1;
7261499d
FC
2452
2453 Newx(dstpad, 1, PADLIST);
2454 ptr_table_store(PL_ptr_table, srcpad, dstpad);
86d2498c
FC
2455 PadlistMAX(dstpad) = max;
2456 Newx(PadlistARRAY(dstpad), max + 1, PAD *);
7261499d
FC
2457
2458 if (cloneall) {
2459 PADOFFSET depth;
2460 for (depth = 0; depth <= max; ++depth)
86d2498c
FC
2461 PadlistARRAY(dstpad)[depth] =
2462 av_dup_inc(PadlistARRAY(srcpad)[depth], param);
6de654a5
NC
2463 } else {
2464 /* CvDEPTH() on our subroutine will be set to 0, so there's no need
2465 to build anything other than the first level of pads. */
86d2498c 2466 I32 ix = AvFILLp(PadlistARRAY(srcpad)[1]);
6de654a5 2467 AV *pad1;
86d2498c
FC
2468 const I32 names_fill = AvFILLp(PadlistARRAY(srcpad)[0]);
2469 const PAD *const srcpad1 = PadlistARRAY(srcpad)[1];
6de654a5
NC
2470 SV **oldpad = AvARRAY(srcpad1);
2471 SV **names;
2472 SV **pad1a;
2473 AV *args;
6de654a5 2474
86d2498c
FC
2475 PadlistARRAY(dstpad)[0] =
2476 av_dup_inc(PadlistARRAY(srcpad)[0], param);
2477 names = AvARRAY(PadlistARRAY(dstpad)[0]);
6de654a5
NC
2478
2479 pad1 = newAV();
2480
2481 av_extend(pad1, ix);
86d2498c 2482 PadlistARRAY(dstpad)[1] = pad1;
6de654a5 2483 pad1a = AvARRAY(pad1);
6de654a5
NC
2484
2485 if (ix > -1) {
2486 AvFILLp(pad1) = ix;
2487
2488 for ( ;ix > 0; ix--) {
05d04d9c
NC
2489 if (!oldpad[ix]) {
2490 pad1a[ix] = NULL;
ce0d59fd
FC
2491 } else if (names_fill >= ix && names[ix] &&
2492 PadnameLEN(names[ix])) {
05d04d9c
NC
2493 const char sigil = SvPVX_const(names[ix])[0];
2494 if ((SvFLAGS(names[ix]) & SVf_FAKE)
2495 || (SvFLAGS(names[ix]) & SVpad_STATE)
2496 || sigil == '&')
2497 {
2498 /* outer lexical or anon code */
2499 pad1a[ix] = sv_dup_inc(oldpad[ix], param);
2500 }
2501 else { /* our own lexical */
adf8f095
NC
2502 if(SvPADSTALE(oldpad[ix]) && SvREFCNT(oldpad[ix]) > 1) {
2503 /* This is a work around for how the current
2504 implementation of ?{ } blocks in regexps
2505 interacts with lexicals. */
05d04d9c
NC
2506 pad1a[ix] = sv_dup_inc(oldpad[ix], param);
2507 } else {
2508 SV *sv;
2509
2510 if (sigil == '@')
2511 sv = MUTABLE_SV(newAV());
2512 else if (sigil == '%')
2513 sv = MUTABLE_SV(newHV());
2514 else
2515 sv = newSV(0);
2516 pad1a[ix] = sv;
2517 SvPADMY_on(sv);
2518 }
2519 }
2520 }
ce0d59fd
FC
2521 else if (IS_PADGV(oldpad[ix])
2522 || ( names_fill >= ix && names[ix]
2523 && PadnamePV(names[ix]) )) {
05d04d9c
NC
2524 pad1a[ix] = sv_dup_inc(oldpad[ix], param);
2525 }
2526 else {
2527 /* save temporaries on recursion? */
2528 SV * const sv = newSV(0);
2529 pad1a[ix] = sv;
2530
2531 /* SvREFCNT(oldpad[ix]) != 1 for some code in threads.xs
2532 FIXTHAT before merging this branch.
2533 (And I know how to) */
2534 if (SvPADMY(oldpad[ix]))
2535 SvPADMY_on(sv);
2536 else
2537 SvPADTMP_on(sv);
2538 }
6de654a5
NC
2539 }
2540
2541 if (oldpad[0]) {
2542 args = newAV(); /* Will be @_ */
2543 AvREIFY_only(args);
2544 pad1a[0] = (SV *)args;
2545 }
2546 }
2547 }
d5b1589c
NC
2548
2549 return dstpad;
2550}
2551
cc76b5cc 2552#endif /* USE_ITHREADS */
d5b1589c 2553
7261499d 2554PAD **
5aaab254 2555Perl_padlist_store(pTHX_ PADLIST *padlist, I32 key, PAD *val)
7261499d 2556{
7261499d 2557 PAD **ary;
86d2498c 2558 SSize_t const oldmax = PadlistMAX(padlist);
7261499d
FC
2559
2560 PERL_ARGS_ASSERT_PADLIST_STORE;
2561
2562 assert(key >= 0);
2563
86d2498c
FC
2564 if (key > PadlistMAX(padlist)) {
2565 av_extend_guts(NULL,key,&PadlistMAX(padlist),
2566 (SV ***)&PadlistARRAY(padlist),
2567 (SV ***)&PadlistARRAY(padlist));
2568 Zero(PadlistARRAY(padlist)+oldmax+1, PadlistMAX(padlist)-oldmax,
7261499d
FC
2569 PAD *);
2570 }
86d2498c 2571 ary = PadlistARRAY(padlist);
7261499d
FC
2572 SvREFCNT_dec(ary[key]);
2573 ary[key] = val;
2574 return &ary[key];
2575}
2576
66610fdd
RGS
2577/*
2578 * Local variables:
2579 * c-indentation-style: bsd
2580 * c-basic-offset: 4
14d04a33 2581 * indent-tabs-mode: nil
66610fdd
RGS
2582 * End:
2583 *
14d04a33 2584 * ex: set ts=8 sts=4 sw=4 et:
37442d52 2585 */