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Convert PAD_DUP to a function Perl_padlist_dup().
[perl5.git] / pad.c
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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
61296642 30This file contains the functions that create and manipulate scratchpads,
166f8a29 31which are array-of-array data structures attached to a CV (ie a sub)
61296642 32and which store lexical variables and opcode temporary and per-thread
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33values.
34
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35=for apidoc m|AV *|CvPADLIST|CV *cv
36CV's can have CvPADLIST(cv) set to point to an AV.
37
38For these purposes "forms" are a kind-of CV, eval""s are too (except they're
39not callable at will and are always thrown away after the eval"" is done
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40executing). Require'd files are simply evals without any outer lexical
41scope.
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42
43XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad,
44but that is really the callers pad (a slot of which is allocated by
45every entersub).
46
47The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items
f3548bdc 48is managed "manual" (mostly in pad.c) rather than normal av.c rules.
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49The items in the AV are not SVs as for a normal AV, but other AVs:
50
510'th Entry of the CvPADLIST is an AV which represents the "names" or rather
52the "static type information" for lexicals.
53
54The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that
55depth of recursion into the CV.
56The 0'th slot of a frame AV is an AV which is @_.
57other entries are storage for variables and op targets.
58
59During compilation:
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60C<PL_comppad_name> is set to the names AV.
61C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1.
62C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)).
dd2155a4 63
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64During execution, C<PL_comppad> and C<PL_curpad> refer to the live
65frame of the currently executing sub.
66
67Iterating over the names AV iterates over all possible pad
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68items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having
69&PL_sv_undef "names" (see pad_alloc()).
70
71Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names.
72The rest are op targets/GVs/constants which are statically allocated
73or resolved at compile time. These don't have names by which they
74can be looked up from Perl code at run time through eval"" like
75my/our variables can be. Since they can't be looked up by "name"
76but only by their index allocated at compile time (which is usually
77in PL_op->op_targ), wasting a name SV for them doesn't make sense.
78
79The SVs in the names AV have their PV being the name of the variable.
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80xlow+1..xhigh inclusive in the NV union is a range of cop_seq numbers for
81which the name is valid. For typed lexicals name SV is SVt_PVMG and SvSTASH
82points at the type. For C<our> lexicals, the type is also SVt_PVMG, with the
73d95100 83SvOURSTASH slot pointing at the stash of the associated global (so that
931b58fb 84duplicate C<our> declarations in the same package can be detected). SvUVX is
3441fb63 85sometimes hijacked to store the generation number during compilation.
dd2155a4 86
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87If SvFAKE is set on the name SV, then that slot in the frame AV is
88a REFCNT'ed reference to a lexical from "outside". In this case,
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89the name SV does not use xlow and xhigh to store a cop_seq range, since it is
90in scope throughout. Instead xhigh stores some flags containing info about
b5c19bd7 91the real lexical (is it declared in an anon, and is it capable of being
3441fb63 92instantiated multiple times?), and for fake ANONs, xlow contains the index
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93within the parent's pad where the lexical's value is stored, to make
94cloning quicker.
dd2155a4 95
a6d05634 96If the 'name' is '&' the corresponding entry in frame AV
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97is a CV representing a possible closure.
98(SvFAKE and name of '&' is not a meaningful combination currently but could
99become so if C<my sub foo {}> is implemented.)
100
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101Note that formats are treated as anon subs, and are cloned each time
102write is called (if necessary).
103
ab8e66c1 104The flag SVs_PADSTALE is cleared on lexicals each time the my() is executed,
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105and set on scope exit. This allows the 'Variable $x is not available' warning
106to be generated in evals, such as
107
108 { my $x = 1; sub f { eval '$x'} } f();
109
ab8e66c1 110For state vars, SVs_PADSTALE is overloaded to mean 'not yet initialised'
d1186544 111
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112=cut
113*/
114
115
116#include "EXTERN.h"
117#define PERL_IN_PAD_C
118#include "perl.h"
952306ac 119#include "keywords.h"
dd2155a4 120
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121#define COP_SEQ_RANGE_LOW_set(sv,val) \
122 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END
123#define COP_SEQ_RANGE_HIGH_set(sv,val) \
124 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END
809abb02 125
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126#define PARENT_PAD_INDEX_set(sv,val) \
127 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END
128#define PARENT_FAKELEX_FLAGS_set(sv,val) \
129 STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END
dd2155a4 130
c8185ac5 131#define PAD_MAX I32_MAX
dd2155a4 132
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133#ifdef PERL_MAD
134void pad_peg(const char* s) {
135 static int pegcnt;
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136
137 PERL_ARGS_ASSERT_PAD_PEG;
138
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139 pegcnt++;
140}
141#endif
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142
143/*
144=for apidoc pad_new
145
146Create a new compiling padlist, saving and updating the various global
147vars at the same time as creating the pad itself. The following flags
148can be OR'ed together:
149
150 padnew_CLONE this pad is for a cloned CV
151 padnew_SAVE save old globals
152 padnew_SAVESUB also save extra stuff for start of sub
153
154=cut
155*/
156
157PADLIST *
c7c737cb 158Perl_pad_new(pTHX_ int flags)
dd2155a4 159{
97aff369 160 dVAR;
e1ec3a88 161 AV *padlist, *padname, *pad;
dd2155a4 162
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163 ASSERT_CURPAD_LEGAL("pad_new");
164
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165 /* XXX DAPM really need a new SAVEt_PAD which restores all or most
166 * vars (based on flags) rather than storing vals + addresses for
167 * each individually. Also see pad_block_start.
168 * XXX DAPM Try to see whether all these conditionals are required
169 */
170
171 /* save existing state, ... */
172
173 if (flags & padnew_SAVE) {
3979c56f 174 SAVECOMPPAD();
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175 SAVESPTR(PL_comppad_name);
176 if (! (flags & padnew_CLONE)) {
177 SAVEI32(PL_padix);
178 SAVEI32(PL_comppad_name_fill);
179 SAVEI32(PL_min_intro_pending);
180 SAVEI32(PL_max_intro_pending);
8bbe96d7 181 SAVEBOOL(PL_cv_has_eval);
dd2155a4 182 if (flags & padnew_SAVESUB) {
f0cb02e3 183 SAVEBOOL(PL_pad_reset_pending);
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184 }
185 }
186 }
187 /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be
188 * saved - check at some pt that this is okay */
189
190 /* ... create new pad ... */
191
192 padlist = newAV();
193 padname = newAV();
194 pad = newAV();
195
196 if (flags & padnew_CLONE) {
197 /* XXX DAPM I dont know why cv_clone needs it
198 * doing differently yet - perhaps this separate branch can be
199 * dispensed with eventually ???
200 */
201
e1ec3a88 202 AV * const a0 = newAV(); /* will be @_ */
dd2155a4 203 av_extend(a0, 0);
ad64d0ec 204 av_store(pad, 0, MUTABLE_SV(a0));
11ca45c0 205 AvREIFY_only(a0);
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206 }
207 else {
a0714e2c 208 av_store(pad, 0, NULL);
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209 }
210
211 AvREAL_off(padlist);
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212 av_store(padlist, 0, MUTABLE_SV(padname));
213 av_store(padlist, 1, MUTABLE_SV(pad));
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214
215 /* ... then update state variables */
216
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217 PL_comppad_name = MUTABLE_AV((*av_fetch(padlist, 0, FALSE)));
218 PL_comppad = MUTABLE_AV((*av_fetch(padlist, 1, FALSE)));
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219 PL_curpad = AvARRAY(PL_comppad);
220
221 if (! (flags & padnew_CLONE)) {
222 PL_comppad_name_fill = 0;
223 PL_min_intro_pending = 0;
224 PL_padix = 0;
b5c19bd7 225 PL_cv_has_eval = 0;
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226 }
227
228 DEBUG_X(PerlIO_printf(Perl_debug_log,
b5c19bd7 229 "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf
dd2155a4 230 " name=0x%"UVxf" flags=0x%"UVxf"\n",
b5c19bd7 231 PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv),
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232 PTR2UV(padname), (UV)flags
233 )
234 );
235
236 return (PADLIST*)padlist;
237}
238
239/*
240=for apidoc pad_undef
241
242Free the padlist associated with a CV.
243If parts of it happen to be current, we null the relevant
244PL_*pad* global vars so that we don't have any dangling references left.
245We also repoint the CvOUTSIDE of any about-to-be-orphaned
a3985cdc 246inner subs to the outer of this cv.
dd2155a4 247
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248(This function should really be called pad_free, but the name was already
249taken)
250
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251=cut
252*/
253
254void
a3985cdc 255Perl_pad_undef(pTHX_ CV* cv)
dd2155a4 256{
97aff369 257 dVAR;
dd2155a4 258 I32 ix;
b64e5050 259 const PADLIST * const padlist = CvPADLIST(cv);
dd2155a4 260
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261 PERL_ARGS_ASSERT_PAD_UNDEF;
262
1dba731d 263 pad_peg("pad_undef");
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264 if (!padlist)
265 return;
0565a181 266 if (SvIS_FREED(padlist)) /* may be during global destruction */
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267 return;
268
269 DEBUG_X(PerlIO_printf(Perl_debug_log,
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270 "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf" comppad=0x%"UVxf"\n",
271 PTR2UV(cv), PTR2UV(padlist), PTR2UV(PL_comppad))
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272 );
273
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274 /* detach any '&' anon children in the pad; if afterwards they
275 * are still live, fix up their CvOUTSIDEs to point to our outside,
276 * bypassing us. */
277 /* XXX DAPM for efficiency, we should only do this if we know we have
278 * children, or integrate this loop with general cleanup */
dd2155a4 279
7dafbf52 280 if (!PL_dirty) { /* don't bother during global destruction */
53c1dcc0 281 CV * const outercv = CvOUTSIDE(cv);
e1ec3a88 282 const U32 seq = CvOUTSIDE_SEQ(cv);
502c6561 283 AV * const comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]);
53c1dcc0 284 SV ** const namepad = AvARRAY(comppad_name);
502c6561 285 AV * const comppad = MUTABLE_AV(AvARRAY(padlist)[1]);
53c1dcc0 286 SV ** const curpad = AvARRAY(comppad);
dd2155a4 287 for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
504618e9 288 SV * const namesv = namepad[ix];
dd2155a4 289 if (namesv && namesv != &PL_sv_undef
b15aece3 290 && *SvPVX_const(namesv) == '&')
dd2155a4 291 {
ea726b52 292 CV * const innercv = MUTABLE_CV(curpad[ix]);
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293 U32 inner_rc = SvREFCNT(innercv);
294 assert(inner_rc);
a0714e2c 295 namepad[ix] = NULL;
7dafbf52 296 SvREFCNT_dec(namesv);
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297
298 if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */
a0714e2c 299 curpad[ix] = NULL;
01773faa 300 SvREFCNT_dec(innercv);
10dc53a8 301 inner_rc--;
01773faa 302 }
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303
304 /* in use, not just a prototype */
305 if (inner_rc && (CvOUTSIDE(innercv) == cv)) {
7dafbf52 306 assert(CvWEAKOUTSIDE(innercv));
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307 /* don't relink to grandfather if he's being freed */
308 if (outercv && SvREFCNT(outercv)) {
309 CvWEAKOUTSIDE_off(innercv);
310 CvOUTSIDE(innercv) = outercv;
311 CvOUTSIDE_SEQ(innercv) = seq;
f84c484e 312 SvREFCNT_inc_simple_void_NN(outercv);
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313 }
314 else {
601f1833 315 CvOUTSIDE(innercv) = NULL;
9d1ce744 316 }
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317 }
318 }
319 }
320 }
7dafbf52 321
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322 ix = AvFILLp(padlist);
323 while (ix >= 0) {
5fe77bf8 324 SV* const sv = AvARRAY(padlist)[ix--];
b37c2d43 325 if (sv) {
ad64d0ec 326 if (sv == (const SV *)PL_comppad_name)
b37c2d43 327 PL_comppad_name = NULL;
ad64d0ec 328 else if (sv == (const SV *)PL_comppad) {
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329 PL_comppad = NULL;
330 PL_curpad = NULL;
331 }
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332 }
333 SvREFCNT_dec(sv);
334 }
ad64d0ec 335 SvREFCNT_dec(MUTABLE_SV(CvPADLIST(cv)));
4608196e 336 CvPADLIST(cv) = NULL;
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337}
338
339
340
341
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342static PADOFFSET
343S_pad_add_name_sv(pTHX_ SV *namesv, const U32 flags, HV *typestash,
344 HV *ourstash)
345{
346 dVAR;
347 const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY);
348
349 PERL_ARGS_ASSERT_PAD_ADD_NAME_SV;
350
351 ASSERT_CURPAD_ACTIVE("pad_add_name");
352
353 if (typestash) {
354 assert(SvTYPE(namesv) == SVt_PVMG);
355 SvPAD_TYPED_on(namesv);
356 SvSTASH_set(namesv, MUTABLE_HV(SvREFCNT_inc_simple_NN(MUTABLE_SV(typestash))));
357 }
358 if (ourstash) {
359 SvPAD_OUR_on(namesv);
360 SvOURSTASH_set(namesv, ourstash);
361 SvREFCNT_inc_simple_void_NN(ourstash);
362 }
59cfed7d 363 else if (flags & padadd_STATE) {
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364 SvPAD_STATE_on(namesv);
365 }
366
367 av_store(PL_comppad_name, offset, namesv);
368 return offset;
369}
370
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371/*
372=for apidoc pad_add_name
373
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374Create a new name and associated PADMY SV in the current pad; return the
375offset.
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376If C<typestash> is valid, the name is for a typed lexical; set the
377name's stash to that value.
378If C<ourstash> is valid, it's an our lexical, set the name's
73d95100 379SvOURSTASH to that value
dd2155a4 380
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381If fake, it means we're cloning an existing entry
382
383=cut
384*/
385
dd2155a4 386PADOFFSET
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387Perl_pad_add_name(pTHX_ const char *name, const STRLEN len, const U32 flags,
388 HV *typestash, HV *ourstash)
dd2155a4 389{
97aff369 390 dVAR;
3291825f 391 PADOFFSET offset;
cca43f78 392 SV *namesv;
dd2155a4 393
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394 PERL_ARGS_ASSERT_PAD_ADD_NAME;
395
59cfed7d 396 if (flags & ~(padadd_OUR|padadd_STATE|padadd_NO_DUP_CHECK))
cca43f78
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397 Perl_croak(aTHX_ "panic: pad_add_name illegal flag bits 0x%" UVxf,
398 (UV)flags);
399
400 namesv = newSV_type((ourstash || typestash) ? SVt_PVMG : SVt_PVNV);
401
402 /* Until we're using the length for real, cross check that we're being told
403 the truth. */
404 PERL_UNUSED_ARG(len);
405 assert(strlen(name) == len);
406
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407 sv_setpv(namesv, name);
408
59cfed7d 409 if ((flags & padadd_NO_DUP_CHECK) == 0) {
2d12d04f 410 /* check for duplicate declaration */
59cfed7d 411 pad_check_dup(namesv, flags & padadd_OUR, ourstash);
2d12d04f
NC
412 }
413
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414 offset = pad_add_name_sv(namesv, flags, typestash, ourstash);
415
416 /* not yet introduced */
417 COP_SEQ_RANGE_LOW_set(namesv, PAD_MAX); /* min */
418 COP_SEQ_RANGE_HIGH_set(namesv, 0); /* max */
419
420 if (!PL_min_intro_pending)
421 PL_min_intro_pending = offset;
422 PL_max_intro_pending = offset;
423 /* if it's not a simple scalar, replace with an AV or HV */
424 /* XXX DAPM since slot has been allocated, replace
425 * av_store with PL_curpad[offset] ? */
426 if (*name == '@')
427 av_store(PL_comppad, offset, MUTABLE_SV(newAV()));
428 else if (*name == '%')
429 av_store(PL_comppad, offset, MUTABLE_SV(newHV()));
430 SvPADMY_on(PL_curpad[offset]);
431 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
432 "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n",
433 (long)offset, name, PTR2UV(PL_curpad[offset])));
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434
435 return offset;
436}
437
438
439
440
441/*
442=for apidoc pad_alloc
443
444Allocate a new my or tmp pad entry. For a my, simply push a null SV onto
445the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards
cf525c36 446for a slot which has no name and no active value.
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447
448=cut
449*/
450
451/* XXX DAPM integrate alloc(), add_name() and add_anon(),
452 * or at least rationalise ??? */
6d640399
NC
453/* And flag whether the incoming name is UTF8 or 8 bit?
454 Could do this either with the +ve/-ve hack of the HV code, or expanding
455 the flag bits. Either way, this makes proper Unicode safe pad support.
6d640399
NC
456 NWC
457*/
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458
459PADOFFSET
460Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
461{
97aff369 462 dVAR;
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463 SV *sv;
464 I32 retval;
465
6136c704 466 PERL_UNUSED_ARG(optype);
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467 ASSERT_CURPAD_ACTIVE("pad_alloc");
468
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469 if (AvARRAY(PL_comppad) != PL_curpad)
470 Perl_croak(aTHX_ "panic: pad_alloc");
471 if (PL_pad_reset_pending)
472 pad_reset();
473 if (tmptype & SVs_PADMY) {
235cc2e3 474 sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
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475 retval = AvFILLp(PL_comppad);
476 }
477 else {
551405c4 478 SV * const * const names = AvARRAY(PL_comppad_name);
e1ec3a88 479 const SSize_t names_fill = AvFILLp(PL_comppad_name);
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480 for (;;) {
481 /*
482 * "foreach" index vars temporarily become aliases to non-"my"
483 * values. Thus we must skip, not just pad values that are
484 * marked as current pad values, but also those with names.
485 */
486 /* HVDS why copy to sv here? we don't seem to use it */
487 if (++PL_padix <= names_fill &&
488 (sv = names[PL_padix]) && sv != &PL_sv_undef)
489 continue;
490 sv = *av_fetch(PL_comppad, PL_padix, TRUE);
491 if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) &&
492 !IS_PADGV(sv) && !IS_PADCONST(sv))
493 break;
494 }
495 retval = PL_padix;
496 }
497 SvFLAGS(sv) |= tmptype;
498 PL_curpad = AvARRAY(PL_comppad);
499
500 DEBUG_X(PerlIO_printf(Perl_debug_log,
501 "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n",
502 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval,
503 PL_op_name[optype]));
fd0854ff
DM
504#ifdef DEBUG_LEAKING_SCALARS
505 sv->sv_debug_optype = optype;
506 sv->sv_debug_inpad = 1;
fd0854ff 507#endif
a212c8b5 508 return (PADOFFSET)retval;
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509}
510
511/*
512=for apidoc pad_add_anon
513
514Add an anon code entry to the current compiling pad
515
516=cut
517*/
518
519PADOFFSET
520Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type)
521{
97aff369 522 dVAR;
dd2155a4 523 PADOFFSET ix;
b9f83d2f 524 SV* const name = newSV_type(SVt_PVNV);
7918f24d
NC
525
526 PERL_ARGS_ASSERT_PAD_ADD_ANON;
527
1dba731d 528 pad_peg("add_anon");
76f68e9b 529 sv_setpvs(name, "&");
809abb02
NC
530 /* Are these two actually ever read? */
531 COP_SEQ_RANGE_HIGH_set(name, ~0);
532 COP_SEQ_RANGE_LOW_set(name, 1);
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533 ix = pad_alloc(op_type, SVs_PADMY);
534 av_store(PL_comppad_name, ix, name);
f3548bdc 535 /* XXX DAPM use PL_curpad[] ? */
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536 av_store(PL_comppad, ix, sv);
537 SvPADMY_on(sv);
7dafbf52
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538
539 /* to avoid ref loops, we never have parent + child referencing each
540 * other simultaneously */
ea726b52
NC
541 if (CvOUTSIDE((const CV *)sv)) {
542 assert(!CvWEAKOUTSIDE((const CV *)sv));
543 CvWEAKOUTSIDE_on(MUTABLE_CV(sv));
544 SvREFCNT_dec(CvOUTSIDE(MUTABLE_CV(sv)));
7dafbf52 545 }
dd2155a4
DM
546 return ix;
547}
548
549
550
551/*
552=for apidoc pad_check_dup
553
554Check for duplicate declarations: report any of:
555 * a my in the current scope with the same name;
556 * an our (anywhere in the pad) with the same name and the same stash
557 as C<ourstash>
558C<is_our> indicates that the name to check is an 'our' declaration
559
560=cut
561*/
562
20381b50 563STATIC void
2d12d04f 564S_pad_check_dup(pTHX_ SV *name, const U32 flags, const HV *ourstash)
dd2155a4 565{
97aff369 566 dVAR;
53c1dcc0 567 SV **svp;
dd2155a4 568 PADOFFSET top, off;
59cfed7d 569 const U32 is_our = flags & padadd_OUR;
dd2155a4 570
7918f24d
NC
571 PERL_ARGS_ASSERT_PAD_CHECK_DUP;
572
f3548bdc 573 ASSERT_CURPAD_ACTIVE("pad_check_dup");
35f82371 574
59cfed7d 575 assert((flags & ~padadd_OUR) == 0);
35f82371 576
041457d9 577 if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC))
dd2155a4
DM
578 return; /* nothing to check */
579
580 svp = AvARRAY(PL_comppad_name);
581 top = AvFILLp(PL_comppad_name);
582 /* check the current scope */
583 /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same
584 * type ? */
585 for (off = top; (I32)off > PL_comppad_name_floor; off--) {
53c1dcc0
AL
586 SV * const sv = svp[off];
587 if (sv
dd2155a4 588 && sv != &PL_sv_undef
ee6cee0c 589 && !SvFAKE(sv)
809abb02 590 && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0)
2d12d04f 591 && sv_eq(name, sv))
dd2155a4 592 {
00b1698f 593 if (is_our && (SvPAD_OUR(sv)))
7f73a9f1 594 break; /* "our" masking "our" */
dd2155a4 595 Perl_warner(aTHX_ packWARN(WARN_MISC),
c541b9b4 596 "\"%s\" variable %"SVf" masks earlier declaration in same %s",
12bd6ede 597 (is_our ? "our" : PL_parser->in_my == KEY_my ? "my" : "state"),
c541b9b4 598 sv,
809abb02 599 (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX ? "scope" : "statement"));
dd2155a4
DM
600 --off;
601 break;
602 }
603 }
604 /* check the rest of the pad */
605 if (is_our) {
606 do {
53c1dcc0
AL
607 SV * const sv = svp[off];
608 if (sv
dd2155a4 609 && sv != &PL_sv_undef
ee6cee0c 610 && !SvFAKE(sv)
809abb02 611 && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0)
73d95100 612 && SvOURSTASH(sv) == ourstash
2d12d04f 613 && sv_eq(name, sv))
dd2155a4
DM
614 {
615 Perl_warner(aTHX_ packWARN(WARN_MISC),
c541b9b4 616 "\"our\" variable %"SVf" redeclared", sv);
624f69f5 617 if ((I32)off <= PL_comppad_name_floor)
7f73a9f1
RGS
618 Perl_warner(aTHX_ packWARN(WARN_MISC),
619 "\t(Did you mean \"local\" instead of \"our\"?)\n");
dd2155a4
DM
620 break;
621 }
622 } while ( off-- > 0 );
623 }
624}
625
626
dd2155a4
DM
627/*
628=for apidoc pad_findmy
629
630Given a lexical name, try to find its offset, first in the current pad,
631or failing that, in the pads of any lexically enclosing subs (including
632the complications introduced by eval). If the name is found in an outer pad,
633then a fake entry is added to the current pad.
634Returns the offset in the current pad, or NOT_IN_PAD on failure.
635
636=cut
637*/
638
639PADOFFSET
f8f98e0a 640Perl_pad_findmy(pTHX_ const char *name, STRLEN len, U32 flags)
dd2155a4 641{
97aff369 642 dVAR;
b5c19bd7
DM
643 SV *out_sv;
644 int out_flags;
929a0744 645 I32 offset;
e1ec3a88 646 const AV *nameav;
929a0744 647 SV **name_svp;
dd2155a4 648
7918f24d
NC
649 PERL_ARGS_ASSERT_PAD_FINDMY;
650
1dba731d 651 pad_peg("pad_findmy");
f8f98e0a
NC
652
653 if (flags)
654 Perl_croak(aTHX_ "panic: pad_findmy illegal flag bits 0x%" UVxf,
655 (UV)flags);
656
657 /* Yes, it is a bug (read work in progress) that we're not really using this
658 length parameter, and instead relying on strlen() later on. But I'm not
659 comfortable about changing the pad API piecemeal to use and rely on
660 lengths. This only exists to avoid an "unused parameter" warning. */
661 if (len < 2)
662 return NOT_IN_PAD;
663
664 /* But until we're using the length for real, cross check that we're being
665 told the truth. */
666 assert(strlen(name) == len);
667
9f7d9405 668 offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1,
4608196e 669 NULL, &out_sv, &out_flags);
9f7d9405 670 if ((PADOFFSET)offset != NOT_IN_PAD)
929a0744
DM
671 return offset;
672
673 /* look for an our that's being introduced; this allows
674 * our $foo = 0 unless defined $foo;
675 * to not give a warning. (Yes, this is a hack) */
676
502c6561 677 nameav = MUTABLE_AV(AvARRAY(CvPADLIST(PL_compcv))[0]);
929a0744
DM
678 name_svp = AvARRAY(nameav);
679 for (offset = AvFILLp(nameav); offset > 0; offset--) {
551405c4 680 const SV * const namesv = name_svp[offset];
929a0744
DM
681 if (namesv && namesv != &PL_sv_undef
682 && !SvFAKE(namesv)
00b1698f 683 && (SvPAD_OUR(namesv))
b15aece3 684 && strEQ(SvPVX_const(namesv), name)
809abb02 685 && COP_SEQ_RANGE_LOW(namesv) == PAD_MAX /* min */
929a0744
DM
686 )
687 return offset;
688 }
689 return NOT_IN_PAD;
dd2155a4
DM
690}
691
e1f795dc
RGS
692/*
693 * Returns the offset of a lexical $_, if there is one, at run time.
694 * Used by the UNDERBAR XS macro.
695 */
696
697PADOFFSET
29289021 698Perl_find_rundefsvoffset(pTHX)
e1f795dc 699{
97aff369 700 dVAR;
e1f795dc
RGS
701 SV *out_sv;
702 int out_flags;
703 return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1,
4608196e 704 NULL, &out_sv, &out_flags);
e1f795dc 705}
dd2155a4 706
dd2155a4
DM
707/*
708=for apidoc pad_findlex
709
710Find a named lexical anywhere in a chain of nested pads. Add fake entries
b5c19bd7
DM
711in the inner pads if it's found in an outer one.
712
713Returns the offset in the bottom pad of the lex or the fake lex.
714cv is the CV in which to start the search, and seq is the current cop_seq
715to match against. If warn is true, print appropriate warnings. The out_*
716vars return values, and so are pointers to where the returned values
717should be stored. out_capture, if non-null, requests that the innermost
718instance of the lexical is captured; out_name_sv is set to the innermost
719matched namesv or fake namesv; out_flags returns the flags normally
720associated with the IVX field of a fake namesv.
721
722Note that pad_findlex() is recursive; it recurses up the chain of CVs,
723then comes back down, adding fake entries as it goes. It has to be this way
3441fb63 724because fake namesvs in anon protoypes have to store in xlow the index into
b5c19bd7 725the parent pad.
dd2155a4
DM
726
727=cut
728*/
729
b5c19bd7
DM
730/* the CV has finished being compiled. This is not a sufficient test for
731 * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */
732#define CvCOMPILED(cv) CvROOT(cv)
733
71f882da
DM
734/* the CV does late binding of its lexicals */
735#define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM)
736
b5c19bd7 737
dd2155a4 738STATIC PADOFFSET
e1ec3a88 739S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn,
b5c19bd7 740 SV** out_capture, SV** out_name_sv, int *out_flags)
dd2155a4 741{
97aff369 742 dVAR;
b5c19bd7
DM
743 I32 offset, new_offset;
744 SV *new_capture;
745 SV **new_capturep;
b64e5050 746 const AV * const padlist = CvPADLIST(cv);
dd2155a4 747
7918f24d
NC
748 PERL_ARGS_ASSERT_PAD_FINDLEX;
749
b5c19bd7 750 *out_flags = 0;
a3985cdc 751
b5c19bd7
DM
752 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
753 "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n",
754 PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" ));
dd2155a4 755
b5c19bd7 756 /* first, search this pad */
dd2155a4 757
b5c19bd7
DM
758 if (padlist) { /* not an undef CV */
759 I32 fake_offset = 0;
502c6561 760 const AV * const nameav = MUTABLE_AV(AvARRAY(padlist)[0]);
551405c4 761 SV * const * const name_svp = AvARRAY(nameav);
ee6cee0c 762
b5c19bd7 763 for (offset = AvFILLp(nameav); offset > 0; offset--) {
551405c4 764 const SV * const namesv = name_svp[offset];
b5c19bd7 765 if (namesv && namesv != &PL_sv_undef
b15aece3 766 && strEQ(SvPVX_const(namesv), name))
b5c19bd7
DM
767 {
768 if (SvFAKE(namesv))
769 fake_offset = offset; /* in case we don't find a real one */
809abb02
NC
770 else if ( seq > COP_SEQ_RANGE_LOW(namesv) /* min */
771 && seq <= COP_SEQ_RANGE_HIGH(namesv)) /* max */
b5c19bd7 772 break;
ee6cee0c
DM
773 }
774 }
775
b5c19bd7
DM
776 if (offset > 0 || fake_offset > 0 ) { /* a match! */
777 if (offset > 0) { /* not fake */
778 fake_offset = 0;
779 *out_name_sv = name_svp[offset]; /* return the namesv */
780
781 /* set PAD_FAKELEX_MULTI if this lex can have multiple
782 * instances. For now, we just test !CvUNIQUE(cv), but
783 * ideally, we should detect my's declared within loops
784 * etc - this would allow a wider range of 'not stayed
785 * shared' warnings. We also treated alreadly-compiled
786 * lexes as not multi as viewed from evals. */
787
788 *out_flags = CvANON(cv) ?
789 PAD_FAKELEX_ANON :
790 (!CvUNIQUE(cv) && ! CvCOMPILED(cv))
791 ? PAD_FAKELEX_MULTI : 0;
792
793 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
809abb02
NC
794 "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%lu,%lu)\n",
795 PTR2UV(cv), (long)offset,
796 (unsigned long)COP_SEQ_RANGE_LOW(*out_name_sv),
797 (unsigned long)COP_SEQ_RANGE_HIGH(*out_name_sv)));
b5c19bd7
DM
798 }
799 else { /* fake match */
800 offset = fake_offset;
801 *out_name_sv = name_svp[offset]; /* return the namesv */
809abb02 802 *out_flags = PARENT_FAKELEX_FLAGS(*out_name_sv);
b5c19bd7 803 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
19a5c512 804 "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n",
b5c19bd7 805 PTR2UV(cv), (long)offset, (unsigned long)*out_flags,
809abb02 806 (unsigned long) PARENT_PAD_INDEX(*out_name_sv)
b5c19bd7
DM
807 ));
808 }
dd2155a4 809
b5c19bd7 810 /* return the lex? */
dd2155a4 811
b5c19bd7 812 if (out_capture) {
dd2155a4 813
b5c19bd7 814 /* our ? */
00b1698f 815 if (SvPAD_OUR(*out_name_sv)) {
a0714e2c 816 *out_capture = NULL;
b5c19bd7
DM
817 return offset;
818 }
ee6cee0c 819
b5c19bd7
DM
820 /* trying to capture from an anon prototype? */
821 if (CvCOMPILED(cv)
822 ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv)
823 : *out_flags & PAD_FAKELEX_ANON)
824 {
a2a5de95
NC
825 if (warn)
826 Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE),
827 "Variable \"%s\" is not available", name);
a0714e2c 828 *out_capture = NULL;
b5c19bd7 829 }
ee6cee0c 830
b5c19bd7
DM
831 /* real value */
832 else {
833 int newwarn = warn;
834 if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI)
d1186544 835 && !SvPAD_STATE(name_svp[offset])
b5c19bd7
DM
836 && warn && ckWARN(WARN_CLOSURE)) {
837 newwarn = 0;
838 Perl_warner(aTHX_ packWARN(WARN_CLOSURE),
839 "Variable \"%s\" will not stay shared", name);
840 }
dd2155a4 841
b5c19bd7
DM
842 if (fake_offset && CvANON(cv)
843 && CvCLONE(cv) &&!CvCLONED(cv))
844 {
845 SV *n;
846 /* not yet caught - look further up */
847 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
848 "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n",
849 PTR2UV(cv)));
850 n = *out_name_sv;
282e1742
DM
851 (void) pad_findlex(name, CvOUTSIDE(cv),
852 CvOUTSIDE_SEQ(cv),
b5c19bd7
DM
853 newwarn, out_capture, out_name_sv, out_flags);
854 *out_name_sv = n;
855 return offset;
dd2155a4 856 }
b5c19bd7 857
502c6561
NC
858 *out_capture = AvARRAY(MUTABLE_AV(AvARRAY(padlist)[
859 CvDEPTH(cv) ? CvDEPTH(cv) : 1]))[offset];
b5c19bd7
DM
860 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
861 "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n",
19a5c512 862 PTR2UV(cv), PTR2UV(*out_capture)));
b5c19bd7 863
d1186544
DM
864 if (SvPADSTALE(*out_capture)
865 && !SvPAD_STATE(name_svp[offset]))
866 {
a2a5de95
NC
867 Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE),
868 "Variable \"%s\" is not available", name);
a0714e2c 869 *out_capture = NULL;
dd2155a4
DM
870 }
871 }
b5c19bd7
DM
872 if (!*out_capture) {
873 if (*name == '@')
ad64d0ec 874 *out_capture = sv_2mortal(MUTABLE_SV(newAV()));
b5c19bd7 875 else if (*name == '%')
ad64d0ec 876 *out_capture = sv_2mortal(MUTABLE_SV(newHV()));
b5c19bd7
DM
877 else
878 *out_capture = sv_newmortal();
879 }
dd2155a4 880 }
b5c19bd7
DM
881
882 return offset;
ee6cee0c 883 }
b5c19bd7
DM
884 }
885
886 /* it's not in this pad - try above */
887
888 if (!CvOUTSIDE(cv))
889 return NOT_IN_PAD;
9f7d9405 890
b5c19bd7 891 /* out_capture non-null means caller wants us to capture lex; in
71f882da 892 * addition we capture ourselves unless it's an ANON/format */
b5c19bd7 893 new_capturep = out_capture ? out_capture :
4608196e 894 CvLATE(cv) ? NULL : &new_capture;
b5c19bd7
DM
895
896 offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1,
897 new_capturep, out_name_sv, out_flags);
9f7d9405 898 if ((PADOFFSET)offset == NOT_IN_PAD)
b5c19bd7 899 return NOT_IN_PAD;
9f7d9405 900
b5c19bd7
DM
901 /* found in an outer CV. Add appropriate fake entry to this pad */
902
903 /* don't add new fake entries (via eval) to CVs that we have already
904 * finished compiling, or to undef CVs */
905 if (CvCOMPILED(cv) || !padlist)
906 return 0; /* this dummy (and invalid) value isnt used by the caller */
907
908 {
3291825f
NC
909 /* This relies on sv_setsv_flags() upgrading the destination to the same
910 type as the source, independant of the flags set, and on it being
911 "good" and only copying flag bits and pointers that it understands.
912 */
913 SV *new_namesv = newSVsv(*out_name_sv);
53c1dcc0
AL
914 AV * const ocomppad_name = PL_comppad_name;
915 PAD * const ocomppad = PL_comppad;
502c6561
NC
916 PL_comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]);
917 PL_comppad = MUTABLE_AV(AvARRAY(padlist)[1]);
b5c19bd7
DM
918 PL_curpad = AvARRAY(PL_comppad);
919
3291825f
NC
920 new_offset
921 = pad_add_name_sv(new_namesv,
59cfed7d 922 (SvPAD_STATE(*out_name_sv) ? padadd_STATE : 0),
3291825f
NC
923 SvPAD_TYPED(*out_name_sv)
924 ? SvSTASH(*out_name_sv) : NULL,
925 SvOURSTASH(*out_name_sv)
926 );
927
928 SvFAKE_on(new_namesv);
929 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
930 "Pad addname: %ld \"%.*s\" FAKE\n",
931 (long)new_offset,
932 (int) SvCUR(new_namesv), SvPVX(new_namesv)));
809abb02 933 PARENT_FAKELEX_FLAGS_set(new_namesv, *out_flags);
b5c19bd7 934
809abb02 935 PARENT_PAD_INDEX_set(new_namesv, 0);
00b1698f 936 if (SvPAD_OUR(new_namesv)) {
6f207bd3 937 NOOP; /* do nothing */
b5c19bd7 938 }
71f882da 939 else if (CvLATE(cv)) {
b5c19bd7 940 /* delayed creation - just note the offset within parent pad */
809abb02 941 PARENT_PAD_INDEX_set(new_namesv, offset);
b5c19bd7
DM
942 CvCLONE_on(cv);
943 }
944 else {
945 /* immediate creation - capture outer value right now */
946 av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep));
947 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
948 "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n",
949 PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset));
dd2155a4 950 }
b5c19bd7 951 *out_name_sv = new_namesv;
809abb02 952 *out_flags = PARENT_FAKELEX_FLAGS(new_namesv);
b5c19bd7
DM
953
954 PL_comppad_name = ocomppad_name;
955 PL_comppad = ocomppad;
4608196e 956 PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL;
dd2155a4 957 }
b5c19bd7 958 return new_offset;
dd2155a4
DM
959}
960
fb8a9836
AL
961
962#ifdef DEBUGGING
dd2155a4
DM
963/*
964=for apidoc pad_sv
965
966Get the value at offset po in the current pad.
967Use macro PAD_SV instead of calling this function directly.
968
969=cut
970*/
971
972
973SV *
974Perl_pad_sv(pTHX_ PADOFFSET po)
975{
97aff369 976 dVAR;
f3548bdc 977 ASSERT_CURPAD_ACTIVE("pad_sv");
dd2155a4 978
dd2155a4
DM
979 if (!po)
980 Perl_croak(aTHX_ "panic: pad_sv po");
dd2155a4
DM
981 DEBUG_X(PerlIO_printf(Perl_debug_log,
982 "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n",
f3548bdc 983 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po]))
dd2155a4
DM
984 );
985 return PL_curpad[po];
986}
987
988
989/*
990=for apidoc pad_setsv
991
992Set the entry at offset po in the current pad to sv.
993Use the macro PAD_SETSV() rather than calling this function directly.
994
995=cut
996*/
997
dd2155a4
DM
998void
999Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv)
1000{
97aff369 1001 dVAR;
7918f24d
NC
1002
1003 PERL_ARGS_ASSERT_PAD_SETSV;
1004
f3548bdc 1005 ASSERT_CURPAD_ACTIVE("pad_setsv");
dd2155a4
DM
1006
1007 DEBUG_X(PerlIO_printf(Perl_debug_log,
1008 "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n",
f3548bdc 1009 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv))
dd2155a4
DM
1010 );
1011 PL_curpad[po] = sv;
1012}
1013#endif
1014
1015
1016
1017/*
1018=for apidoc pad_block_start
1019
1020Update the pad compilation state variables on entry to a new block
1021
1022=cut
1023*/
1024
1025/* XXX DAPM perhaps:
1026 * - integrate this in general state-saving routine ???
1027 * - combine with the state-saving going on in pad_new ???
1028 * - introduce a new SAVE type that does all this in one go ?
1029 */
1030
1031void
1032Perl_pad_block_start(pTHX_ int full)
1033{
97aff369 1034 dVAR;
f3548bdc 1035 ASSERT_CURPAD_ACTIVE("pad_block_start");
dd2155a4
DM
1036 SAVEI32(PL_comppad_name_floor);
1037 PL_comppad_name_floor = AvFILLp(PL_comppad_name);
1038 if (full)
1039 PL_comppad_name_fill = PL_comppad_name_floor;
1040 if (PL_comppad_name_floor < 0)
1041 PL_comppad_name_floor = 0;
1042 SAVEI32(PL_min_intro_pending);
1043 SAVEI32(PL_max_intro_pending);
1044 PL_min_intro_pending = 0;
1045 SAVEI32(PL_comppad_name_fill);
1046 SAVEI32(PL_padix_floor);
1047 PL_padix_floor = PL_padix;
1048 PL_pad_reset_pending = FALSE;
1049}
1050
1051
1052/*
1053=for apidoc intro_my
1054
1055"Introduce" my variables to visible status.
1056
1057=cut
1058*/
1059
1060U32
1061Perl_intro_my(pTHX)
1062{
97aff369 1063 dVAR;
dd2155a4 1064 SV **svp;
dd2155a4
DM
1065 I32 i;
1066
f3548bdc 1067 ASSERT_CURPAD_ACTIVE("intro_my");
dd2155a4
DM
1068 if (! PL_min_intro_pending)
1069 return PL_cop_seqmax;
1070
1071 svp = AvARRAY(PL_comppad_name);
1072 for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) {
53c1dcc0
AL
1073 SV * const sv = svp[i];
1074
809abb02
NC
1075 if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !COP_SEQ_RANGE_HIGH(sv)) {
1076 COP_SEQ_RANGE_HIGH_set(sv, PAD_MAX); /* Don't know scope end yet. */
1077 COP_SEQ_RANGE_LOW_set(sv, PL_cop_seqmax);
dd2155a4 1078 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
809abb02 1079 "Pad intromy: %ld \"%s\", (%lu,%lu)\n",
b15aece3 1080 (long)i, SvPVX_const(sv),
809abb02
NC
1081 (unsigned long)COP_SEQ_RANGE_LOW(sv),
1082 (unsigned long)COP_SEQ_RANGE_HIGH(sv))
dd2155a4
DM
1083 );
1084 }
1085 }
1086 PL_min_intro_pending = 0;
1087 PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */
1088 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1089 "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1)));
1090
1091 return PL_cop_seqmax++;
1092}
1093
1094/*
1095=for apidoc pad_leavemy
1096
1097Cleanup at end of scope during compilation: set the max seq number for
1098lexicals in this scope and warn of any lexicals that never got introduced.
1099
1100=cut
1101*/
1102
1103void
1104Perl_pad_leavemy(pTHX)
1105{
97aff369 1106 dVAR;
dd2155a4 1107 I32 off;
551405c4 1108 SV * const * const svp = AvARRAY(PL_comppad_name);
dd2155a4
DM
1109
1110 PL_pad_reset_pending = FALSE;
1111
f3548bdc 1112 ASSERT_CURPAD_ACTIVE("pad_leavemy");
dd2155a4
DM
1113 if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) {
1114 for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
53c1dcc0 1115 const SV * const sv = svp[off];
9b387841
NC
1116 if (sv && sv != &PL_sv_undef && !SvFAKE(sv))
1117 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
1118 "%"SVf" never introduced",
1119 SVfARG(sv));
dd2155a4
DM
1120 }
1121 }
1122 /* "Deintroduce" my variables that are leaving with this scope. */
1123 for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) {
53c1dcc0 1124 const SV * const sv = svp[off];
809abb02
NC
1125 if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && COP_SEQ_RANGE_HIGH(sv) == PAD_MAX) {
1126 COP_SEQ_RANGE_HIGH_set(sv, PL_cop_seqmax);
dd2155a4 1127 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
809abb02 1128 "Pad leavemy: %ld \"%s\", (%lu,%lu)\n",
b15aece3 1129 (long)off, SvPVX_const(sv),
809abb02
NC
1130 (unsigned long)COP_SEQ_RANGE_LOW(sv),
1131 (unsigned long)COP_SEQ_RANGE_HIGH(sv))
dd2155a4
DM
1132 );
1133 }
1134 }
1135 PL_cop_seqmax++;
1136 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1137 "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax));
1138}
1139
1140
1141/*
1142=for apidoc pad_swipe
1143
1144Abandon the tmp in the current pad at offset po and replace with a
1145new one.
1146
1147=cut
1148*/
1149
1150void
1151Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust)
1152{
97aff369 1153 dVAR;
f3548bdc 1154 ASSERT_CURPAD_LEGAL("pad_swipe");
dd2155a4
DM
1155 if (!PL_curpad)
1156 return;
1157 if (AvARRAY(PL_comppad) != PL_curpad)
1158 Perl_croak(aTHX_ "panic: pad_swipe curpad");
1159 if (!po)
1160 Perl_croak(aTHX_ "panic: pad_swipe po");
1161
1162 DEBUG_X(PerlIO_printf(Perl_debug_log,
1163 "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n",
1164 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po));
1165
1166 if (PL_curpad[po])
1167 SvPADTMP_off(PL_curpad[po]);
1168 if (refadjust)
1169 SvREFCNT_dec(PL_curpad[po]);
1170
9ad9869c
DM
1171
1172 /* if pad tmps aren't shared between ops, then there's no need to
1173 * create a new tmp when an existing op is freed */
1174#ifdef USE_BROKEN_PAD_RESET
561b68a9 1175 PL_curpad[po] = newSV(0);
dd2155a4 1176 SvPADTMP_on(PL_curpad[po]);
9ad9869c
DM
1177#else
1178 PL_curpad[po] = &PL_sv_undef;
97bf4a8d 1179#endif
dd2155a4
DM
1180 if ((I32)po < PL_padix)
1181 PL_padix = po - 1;
1182}
1183
1184
1185/*
1186=for apidoc pad_reset
1187
1188Mark all the current temporaries for reuse
1189
1190=cut
1191*/
1192
1193/* XXX pad_reset() is currently disabled because it results in serious bugs.
1194 * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
1195 * on the stack by OPs that use them, there are several ways to get an alias
1196 * to a shared TARG. Such an alias will change randomly and unpredictably.
1197 * We avoid doing this until we can think of a Better Way.
1198 * GSAR 97-10-29 */
1f676739 1199static void
82af08ae 1200S_pad_reset(pTHX)
dd2155a4 1201{
97aff369 1202 dVAR;
dd2155a4 1203#ifdef USE_BROKEN_PAD_RESET
dd2155a4
DM
1204 if (AvARRAY(PL_comppad) != PL_curpad)
1205 Perl_croak(aTHX_ "panic: pad_reset curpad");
1206
1207 DEBUG_X(PerlIO_printf(Perl_debug_log,
1208 "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld",
1209 PTR2UV(PL_comppad), PTR2UV(PL_curpad),
1210 (long)PL_padix, (long)PL_padix_floor
1211 )
1212 );
1213
1214 if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
e1ec3a88 1215 register I32 po;
dd2155a4
DM
1216 for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
1217 if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
1218 SvPADTMP_off(PL_curpad[po]);
1219 }
1220 PL_padix = PL_padix_floor;
1221 }
1222#endif
1223 PL_pad_reset_pending = FALSE;
1224}
1225
1226
1227/*
1228=for apidoc pad_tidy
1229
1230Tidy up a pad after we've finished compiling it:
1231 * remove most stuff from the pads of anonsub prototypes;
1232 * give it a @_;
1233 * mark tmps as such.
1234
1235=cut
1236*/
1237
1238/* XXX DAPM surely most of this stuff should be done properly
1239 * at the right time beforehand, rather than going around afterwards
1240 * cleaning up our mistakes ???
1241 */
1242
1243void
1244Perl_pad_tidy(pTHX_ padtidy_type type)
1245{
27da23d5 1246 dVAR;
dd2155a4 1247
f3548bdc 1248 ASSERT_CURPAD_ACTIVE("pad_tidy");
b5c19bd7
DM
1249
1250 /* If this CV has had any 'eval-capable' ops planted in it
1251 * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any
1252 * anon prototypes in the chain of CVs should be marked as cloneable,
1253 * so that for example the eval's CV in C<< sub { eval '$x' } >> gets
1254 * the right CvOUTSIDE.
1255 * If running with -d, *any* sub may potentially have an eval
1256 * excuted within it.
1257 */
1258
1259 if (PL_cv_has_eval || PL_perldb) {
e1ec3a88 1260 const CV *cv;
b5c19bd7
DM
1261 for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) {
1262 if (cv != PL_compcv && CvCOMPILED(cv))
1263 break; /* no need to mark already-compiled code */
1264 if (CvANON(cv)) {
1265 DEBUG_Xv(PerlIO_printf(Perl_debug_log,
1266 "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv)));
1267 CvCLONE_on(cv);
1268 }
1269 }
1270 }
1271
dd2155a4
DM
1272 /* extend curpad to match namepad */
1273 if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad))
a0714e2c 1274 av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL);
dd2155a4
DM
1275
1276 if (type == padtidy_SUBCLONE) {
551405c4 1277 SV * const * const namep = AvARRAY(PL_comppad_name);
504618e9 1278 PADOFFSET ix;
b5c19bd7 1279
dd2155a4
DM
1280 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1281 SV *namesv;
1282
1283 if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix]))
1284 continue;
1285 /*
1286 * The only things that a clonable function needs in its
b5c19bd7 1287 * pad are anonymous subs.
dd2155a4
DM
1288 * The rest are created anew during cloning.
1289 */
a0714e2c 1290 if (!((namesv = namep[ix]) != NULL &&
dd2155a4 1291 namesv != &PL_sv_undef &&
b15aece3 1292 *SvPVX_const(namesv) == '&'))
dd2155a4
DM
1293 {
1294 SvREFCNT_dec(PL_curpad[ix]);
a0714e2c 1295 PL_curpad[ix] = NULL;
dd2155a4
DM
1296 }
1297 }
1298 }
1299 else if (type == padtidy_SUB) {
1300 /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */
53c1dcc0 1301 AV * const av = newAV(); /* Will be @_ */
dd2155a4 1302 av_extend(av, 0);
ad64d0ec 1303 av_store(PL_comppad, 0, MUTABLE_SV(av));
11ca45c0 1304 AvREIFY_only(av);
dd2155a4
DM
1305 }
1306
1307 /* XXX DAPM rationalise these two similar branches */
1308
1309 if (type == padtidy_SUB) {
504618e9 1310 PADOFFSET ix;
dd2155a4
DM
1311 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1312 if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix]))
1313 continue;
1314 if (!SvPADMY(PL_curpad[ix]))
1315 SvPADTMP_on(PL_curpad[ix]);
1316 }
1317 }
1318 else if (type == padtidy_FORMAT) {
504618e9 1319 PADOFFSET ix;
dd2155a4
DM
1320 for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
1321 if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix]))
1322 SvPADTMP_on(PL_curpad[ix]);
1323 }
1324 }
f3548bdc 1325 PL_curpad = AvARRAY(PL_comppad);
dd2155a4
DM
1326}
1327
1328
1329/*
1330=for apidoc pad_free
1331
8627550a 1332Free the SV at offset po in the current pad.
dd2155a4
DM
1333
1334=cut
1335*/
1336
1337/* XXX DAPM integrate with pad_swipe ???? */
1338void
1339Perl_pad_free(pTHX_ PADOFFSET po)
1340{
97aff369 1341 dVAR;
f3548bdc 1342 ASSERT_CURPAD_LEGAL("pad_free");
dd2155a4
DM
1343 if (!PL_curpad)
1344 return;
1345 if (AvARRAY(PL_comppad) != PL_curpad)
1346 Perl_croak(aTHX_ "panic: pad_free curpad");
1347 if (!po)
1348 Perl_croak(aTHX_ "panic: pad_free po");
1349
1350 DEBUG_X(PerlIO_printf(Perl_debug_log,
1351 "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n",
1352 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)
1353 );
1354
1355 if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) {
1356 SvPADTMP_off(PL_curpad[po]);
1357#ifdef USE_ITHREADS
7e736055 1358 /* SV could be a shared hash key (eg bugid #19022) */
ddea3ea7 1359 if (!SvIsCOW(PL_curpad[po]))
dd2155a4 1360 SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */
dd2155a4
DM
1361#endif
1362 }
1363 if ((I32)po < PL_padix)
1364 PL_padix = po - 1;
1365}
1366
1367
1368
1369/*
1370=for apidoc do_dump_pad
1371
1372Dump the contents of a padlist
1373
1374=cut
1375*/
1376
1377void
1378Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full)
1379{
97aff369 1380 dVAR;
e1ec3a88
AL
1381 const AV *pad_name;
1382 const AV *pad;
dd2155a4
DM
1383 SV **pname;
1384 SV **ppad;
dd2155a4
DM
1385 I32 ix;
1386
7918f24d
NC
1387 PERL_ARGS_ASSERT_DO_DUMP_PAD;
1388
dd2155a4
DM
1389 if (!padlist) {
1390 return;
1391 }
502c6561
NC
1392 pad_name = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 0, FALSE));
1393 pad = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 1, FALSE));
dd2155a4
DM
1394 pname = AvARRAY(pad_name);
1395 ppad = AvARRAY(pad);
1396 Perl_dump_indent(aTHX_ level, file,
1397 "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n",
1398 PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad)
1399 );
1400
1401 for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
e1ec3a88 1402 const SV *namesv = pname[ix];
dd2155a4 1403 if (namesv && namesv == &PL_sv_undef) {
a0714e2c 1404 namesv = NULL;
dd2155a4
DM
1405 }
1406 if (namesv) {
ee6cee0c
DM
1407 if (SvFAKE(namesv))
1408 Perl_dump_indent(aTHX_ level+1, file,
c0fd1b42 1409 "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n",
ee6cee0c
DM
1410 (int) ix,
1411 PTR2UV(ppad[ix]),
1412 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
b15aece3 1413 SvPVX_const(namesv),
809abb02
NC
1414 (unsigned long)PARENT_FAKELEX_FLAGS(namesv),
1415 (unsigned long)PARENT_PAD_INDEX(namesv)
b5c19bd7 1416
ee6cee0c
DM
1417 );
1418 else
1419 Perl_dump_indent(aTHX_ level+1, file,
809abb02 1420 "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n",
ee6cee0c
DM
1421 (int) ix,
1422 PTR2UV(ppad[ix]),
1423 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0),
809abb02
NC
1424 (unsigned long)COP_SEQ_RANGE_LOW(namesv),
1425 (unsigned long)COP_SEQ_RANGE_HIGH(namesv),
b15aece3 1426 SvPVX_const(namesv)
ee6cee0c 1427 );
dd2155a4
DM
1428 }
1429 else if (full) {
1430 Perl_dump_indent(aTHX_ level+1, file,
1431 "%2d. 0x%"UVxf"<%lu>\n",
1432 (int) ix,
1433 PTR2UV(ppad[ix]),
1434 (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0)
1435 );
1436 }
1437 }
1438}
1439
1440
1441
1442/*
1443=for apidoc cv_dump
1444
1445dump the contents of a CV
1446
1447=cut
1448*/
1449
1450#ifdef DEBUGGING
1451STATIC void
e1ec3a88 1452S_cv_dump(pTHX_ const CV *cv, const char *title)
dd2155a4 1453{
97aff369 1454 dVAR;
53c1dcc0
AL
1455 const CV * const outside = CvOUTSIDE(cv);
1456 AV* const padlist = CvPADLIST(cv);
dd2155a4 1457
7918f24d
NC
1458 PERL_ARGS_ASSERT_CV_DUMP;
1459
dd2155a4
DM
1460 PerlIO_printf(Perl_debug_log,
1461 " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n",
1462 title,
1463 PTR2UV(cv),
1464 (CvANON(cv) ? "ANON"
71f882da 1465 : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT"
dd2155a4
DM
1466 : (cv == PL_main_cv) ? "MAIN"
1467 : CvUNIQUE(cv) ? "UNIQUE"
1468 : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
1469 PTR2UV(outside),
1470 (!outside ? "null"
1471 : CvANON(outside) ? "ANON"
1472 : (outside == PL_main_cv) ? "MAIN"
1473 : CvUNIQUE(outside) ? "UNIQUE"
1474 : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED"));
1475
1476 PerlIO_printf(Perl_debug_log,
1477 " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist));
1478 do_dump_pad(1, Perl_debug_log, padlist, 1);
1479}
1480#endif /* DEBUGGING */
1481
1482
1483
1484
1485
1486/*
1487=for apidoc cv_clone
1488
1489Clone a CV: make a new CV which points to the same code etc, but which
1490has a newly-created pad built by copying the prototype pad and capturing
1491any outer lexicals.
1492
1493=cut
1494*/
1495
1496CV *
1497Perl_cv_clone(pTHX_ CV *proto)
1498{
27da23d5 1499 dVAR;
dd2155a4 1500 I32 ix;
53c1dcc0 1501 AV* const protopadlist = CvPADLIST(proto);
502c6561
NC
1502 const AV *const protopad_name = (const AV *)*av_fetch(protopadlist, 0, FALSE);
1503 const AV *const protopad = (const AV *)*av_fetch(protopadlist, 1, FALSE);
53c1dcc0
AL
1504 SV** const pname = AvARRAY(protopad_name);
1505 SV** const ppad = AvARRAY(protopad);
e1ec3a88
AL
1506 const I32 fname = AvFILLp(protopad_name);
1507 const I32 fpad = AvFILLp(protopad);
dd2155a4 1508 CV* cv;
b5c19bd7
DM
1509 SV** outpad;
1510 CV* outside;
71f882da 1511 long depth;
dd2155a4 1512
7918f24d
NC
1513 PERL_ARGS_ASSERT_CV_CLONE;
1514
dd2155a4
DM
1515 assert(!CvUNIQUE(proto));
1516
71f882da
DM
1517 /* Since cloneable anon subs can be nested, CvOUTSIDE may point
1518 * to a prototype; we instead want the cloned parent who called us.
1519 * Note that in general for formats, CvOUTSIDE != find_runcv */
1520
1521 outside = CvOUTSIDE(proto);
1522 if (outside && CvCLONE(outside) && ! CvCLONED(outside))
1523 outside = find_runcv(NULL);
1524 depth = CvDEPTH(outside);
1525 assert(depth || SvTYPE(proto) == SVt_PVFM);
1526 if (!depth)
1527 depth = 1;
b5c19bd7
DM
1528 assert(CvPADLIST(outside));
1529
dd2155a4
DM
1530 ENTER;
1531 SAVESPTR(PL_compcv);
1532
ea726b52 1533 cv = PL_compcv = MUTABLE_CV(newSV_type(SvTYPE(proto)));
7dafbf52 1534 CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE);
dd2155a4
DM
1535 CvCLONED_on(cv);
1536
dd2155a4 1537#ifdef USE_ITHREADS
aed2304a
NC
1538 CvFILE(cv) = CvISXSUB(proto) ? CvFILE(proto)
1539 : savepv(CvFILE(proto));
dd2155a4
DM
1540#else
1541 CvFILE(cv) = CvFILE(proto);
1542#endif
1543 CvGV(cv) = CvGV(proto);
1544 CvSTASH(cv) = CvSTASH(proto);
b34c0dd4 1545 OP_REFCNT_LOCK;
dd2155a4 1546 CvROOT(cv) = OpREFCNT_inc(CvROOT(proto));
b34c0dd4 1547 OP_REFCNT_UNLOCK;
dd2155a4 1548 CvSTART(cv) = CvSTART(proto);
ea726b52 1549 CvOUTSIDE(cv) = MUTABLE_CV(SvREFCNT_inc_simple(outside));
b5c19bd7 1550 CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto);
dd2155a4
DM
1551
1552 if (SvPOK(proto))
ad64d0ec 1553 sv_setpvn(MUTABLE_SV(cv), SvPVX_const(proto), SvCUR(proto));
dd2155a4 1554
b7787f18 1555 CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE);
dd2155a4 1556
b5c19bd7 1557 av_fill(PL_comppad, fpad);
dd2155a4
DM
1558 for (ix = fname; ix >= 0; ix--)
1559 av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix]));
1560
dd2155a4
DM
1561 PL_curpad = AvARRAY(PL_comppad);
1562
71f882da 1563 outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]);
b5c19bd7 1564
dd2155a4 1565 for (ix = fpad; ix > 0; ix--) {
a0714e2c
SS
1566 SV* const namesv = (ix <= fname) ? pname[ix] : NULL;
1567 SV *sv = NULL;
71f882da 1568 if (namesv && namesv != &PL_sv_undef) { /* lexical */
b5c19bd7 1569 if (SvFAKE(namesv)) { /* lexical from outside? */
809abb02 1570 sv = outpad[PARENT_PAD_INDEX(namesv)];
71f882da 1571 assert(sv);
33894c1a
DM
1572 /* formats may have an inactive parent,
1573 while my $x if $false can leave an active var marked as
d1186544
DM
1574 stale. And state vars are always available */
1575 if (SvPADSTALE(sv) && !SvPAD_STATE(namesv)) {
a2a5de95
NC
1576 Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE),
1577 "Variable \"%s\" is not available", SvPVX_const(namesv));
a0714e2c 1578 sv = NULL;
71f882da 1579 }
33894c1a 1580 else
f84c484e 1581 SvREFCNT_inc_simple_void_NN(sv);
dd2155a4 1582 }
71f882da 1583 if (!sv) {
b15aece3 1584 const char sigil = SvPVX_const(namesv)[0];
e1ec3a88 1585 if (sigil == '&')
dd2155a4 1586 sv = SvREFCNT_inc(ppad[ix]);
e1ec3a88 1587 else if (sigil == '@')
ad64d0ec 1588 sv = MUTABLE_SV(newAV());
e1ec3a88 1589 else if (sigil == '%')
ad64d0ec 1590 sv = MUTABLE_SV(newHV());
dd2155a4 1591 else
561b68a9 1592 sv = newSV(0);
235cc2e3 1593 SvPADMY_on(sv);
0d3b281c
DM
1594 /* reset the 'assign only once' flag on each state var */
1595 if (SvPAD_STATE(namesv))
1596 SvPADSTALE_on(sv);
dd2155a4
DM
1597 }
1598 }
1599 else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) {
f84c484e 1600 sv = SvREFCNT_inc_NN(ppad[ix]);
dd2155a4
DM
1601 }
1602 else {
561b68a9 1603 sv = newSV(0);
dd2155a4 1604 SvPADTMP_on(sv);
dd2155a4 1605 }
71f882da 1606 PL_curpad[ix] = sv;
dd2155a4
DM
1607 }
1608
dd2155a4
DM
1609 DEBUG_Xv(
1610 PerlIO_printf(Perl_debug_log, "\nPad CV clone\n");
1611 cv_dump(outside, "Outside");
1612 cv_dump(proto, "Proto");
1613 cv_dump(cv, "To");
1614 );
1615
1616 LEAVE;
1617
1618 if (CvCONST(cv)) {
b5c19bd7
DM
1619 /* Constant sub () { $x } closing over $x - see lib/constant.pm:
1620 * The prototype was marked as a candiate for const-ization,
1621 * so try to grab the current const value, and if successful,
1622 * turn into a const sub:
1623 */
551405c4 1624 SV* const const_sv = op_const_sv(CvSTART(cv), cv);
b5c19bd7
DM
1625 if (const_sv) {
1626 SvREFCNT_dec(cv);
bd61b366 1627 cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv);
b5c19bd7
DM
1628 }
1629 else {
1630 CvCONST_off(cv);
1631 }
dd2155a4
DM
1632 }
1633
1634 return cv;
1635}
1636
1637
1638/*
1639=for apidoc pad_fixup_inner_anons
1640
1641For any anon CVs in the pad, change CvOUTSIDE of that CV from
7dafbf52
DM
1642old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be
1643moved to a pre-existing CV struct.
dd2155a4
DM
1644
1645=cut
1646*/
1647
1648void
1649Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv)
1650{
97aff369 1651 dVAR;
dd2155a4 1652 I32 ix;
502c6561
NC
1653 AV * const comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]);
1654 AV * const comppad = MUTABLE_AV(AvARRAY(padlist)[1]);
53c1dcc0
AL
1655 SV ** const namepad = AvARRAY(comppad_name);
1656 SV ** const curpad = AvARRAY(comppad);
7918f24d
NC
1657
1658 PERL_ARGS_ASSERT_PAD_FIXUP_INNER_ANONS;
294a48e9
AL
1659 PERL_UNUSED_ARG(old_cv);
1660
dd2155a4 1661 for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
551405c4 1662 const SV * const namesv = namepad[ix];
dd2155a4 1663 if (namesv && namesv != &PL_sv_undef
b15aece3 1664 && *SvPVX_const(namesv) == '&')
dd2155a4 1665 {
ea726b52 1666 CV * const innercv = MUTABLE_CV(curpad[ix]);
7dafbf52
DM
1667 assert(CvWEAKOUTSIDE(innercv));
1668 assert(CvOUTSIDE(innercv) == old_cv);
1669 CvOUTSIDE(innercv) = new_cv;
dd2155a4
DM
1670 }
1671 }
1672}
1673
7dafbf52 1674
dd2155a4
DM
1675/*
1676=for apidoc pad_push
1677
1678Push a new pad frame onto the padlist, unless there's already a pad at
26019298
AL
1679this depth, in which case don't bother creating a new one. Then give
1680the new pad an @_ in slot zero.
dd2155a4
DM
1681
1682=cut
1683*/
1684
1685void
26019298 1686Perl_pad_push(pTHX_ PADLIST *padlist, int depth)
dd2155a4 1687{
97aff369 1688 dVAR;
7918f24d
NC
1689
1690 PERL_ARGS_ASSERT_PAD_PUSH;
1691
b37c2d43 1692 if (depth > AvFILLp(padlist)) {
44f8325f
AL
1693 SV** const svp = AvARRAY(padlist);
1694 AV* const newpad = newAV();
1695 SV** const oldpad = AvARRAY(svp[depth-1]);
502c6561
NC
1696 I32 ix = AvFILLp((const AV *)svp[1]);
1697 const I32 names_fill = AvFILLp((const AV *)svp[0]);
44f8325f 1698 SV** const names = AvARRAY(svp[0]);
26019298
AL
1699 AV *av;
1700
dd2155a4
DM
1701 for ( ;ix > 0; ix--) {
1702 if (names_fill >= ix && names[ix] != &PL_sv_undef) {
b15aece3 1703 const char sigil = SvPVX_const(names[ix])[0];
fda94784
RGS
1704 if ((SvFLAGS(names[ix]) & SVf_FAKE)
1705 || (SvFLAGS(names[ix]) & SVpad_STATE)
1706 || sigil == '&')
1707 {
dd2155a4
DM
1708 /* outer lexical or anon code */
1709 av_store(newpad, ix, SvREFCNT_inc(oldpad[ix]));
1710 }
1711 else { /* our own lexical */
26019298
AL
1712 SV *sv;
1713 if (sigil == '@')
ad64d0ec 1714 sv = MUTABLE_SV(newAV());
26019298 1715 else if (sigil == '%')
ad64d0ec 1716 sv = MUTABLE_SV(newHV());
dd2155a4 1717 else
561b68a9 1718 sv = newSV(0);
26019298 1719 av_store(newpad, ix, sv);
dd2155a4
DM
1720 SvPADMY_on(sv);
1721 }
1722 }
1723 else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) {
f84c484e 1724 av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix]));
dd2155a4
DM
1725 }
1726 else {
1727 /* save temporaries on recursion? */
561b68a9 1728 SV * const sv = newSV(0);
26019298 1729 av_store(newpad, ix, sv);
dd2155a4
DM
1730 SvPADTMP_on(sv);
1731 }
1732 }
26019298
AL
1733 av = newAV();
1734 av_extend(av, 0);
ad64d0ec 1735 av_store(newpad, 0, MUTABLE_SV(av));
11ca45c0 1736 AvREIFY_only(av);
26019298 1737
ad64d0ec 1738 av_store(padlist, depth, MUTABLE_SV(newpad));
dd2155a4
DM
1739 AvFILLp(padlist) = depth;
1740 }
1741}
b21dc031
AL
1742
1743
1744HV *
1745Perl_pad_compname_type(pTHX_ const PADOFFSET po)
1746{
97aff369 1747 dVAR;
551405c4 1748 SV* const * const av = av_fetch(PL_comppad_name, po, FALSE);
00b1698f 1749 if ( SvPAD_TYPED(*av) ) {
b21dc031
AL
1750 return SvSTASH(*av);
1751 }
5c284bb0 1752 return NULL;
b21dc031 1753}
66610fdd 1754
d5b1589c
NC
1755#if defined(USE_ITHREADS)
1756
1757# define av_dup_inc(s,t) MUTABLE_AV(sv_dup_inc((const SV *)s,t))
1758
1759AV *
1760Perl_padlist_dup(pTHX_ AV *const srcpad, CLONE_PARAMS *const param)
1761{
1762 AV *dstpad;
1763 PERL_ARGS_ASSERT_PADLIST_DUP;
1764
1765 if (!srcpad)
1766 return NULL;
1767
1768 assert(!AvREAL(srcpad));
1769 /* XXX padlists are real, but pretend to be not */
1770 AvREAL_on(srcpad);
1771 dstpad = av_dup_inc(srcpad, param);
1772 AvREAL_off(srcpad);
1773 AvREAL_off(dstpad);
1774
1775 return dstpad;
1776}
1777
1778#endif
1779
66610fdd
RGS
1780/*
1781 * Local variables:
1782 * c-indentation-style: bsd
1783 * c-basic-offset: 4
1784 * indent-tabs-mode: t
1785 * End:
1786 *
37442d52
RGS
1787 * ex: set ts=8 sts=4 sw=4 noet:
1788 */