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dd2155a4 DM |
1 | /* pad.c |
2 | * | |
b5f8cc5c | 3 | * Copyright (C) 2002, 2003, 2004, by Larry Wall and others |
dd2155a4 DM |
4 | * |
5 | * You may distribute under the terms of either the GNU General Public | |
6 | * License or the Artistic License, as specified in the README file. | |
7 | * | |
8 | * "Anyway: there was this Mr Frodo left an orphan and stranded, as you | |
9 | * might say, among those queer Bucklanders, being brought up anyhow in | |
10 | * Brandy Hall. A regular warren, by all accounts. Old Master Gorbadoc | |
11 | * never had fewer than a couple of hundred relations in the place. Mr | |
12 | * Bilbo never did a kinder deed than when he brought the lad back to | |
13 | * live among decent folk." --the Gaffer | |
14 | */ | |
15 | ||
16 | /* XXX DAPM | |
17 | * As of Sept 2002, this file is new and may be in a state of flux for | |
18 | * a while. I've marked things I intent to come back and look at further | |
19 | * with an 'XXX DAPM' comment. | |
20 | */ | |
21 | ||
22 | /* | |
23 | =head1 Pad Data Structures | |
24 | ||
25 | =for apidoc m|AV *|CvPADLIST|CV *cv | |
26 | CV's can have CvPADLIST(cv) set to point to an AV. | |
27 | ||
28 | For these purposes "forms" are a kind-of CV, eval""s are too (except they're | |
29 | not callable at will and are always thrown away after the eval"" is done | |
b5c19bd7 DM |
30 | executing). Require'd files are simply evals without any outer lexical |
31 | scope. | |
dd2155a4 DM |
32 | |
33 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, | |
34 | but that is really the callers pad (a slot of which is allocated by | |
35 | every entersub). | |
36 | ||
37 | The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items | |
f3548bdc | 38 | is managed "manual" (mostly in pad.c) rather than normal av.c rules. |
dd2155a4 DM |
39 | The items in the AV are not SVs as for a normal AV, but other AVs: |
40 | ||
41 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather | |
42 | the "static type information" for lexicals. | |
43 | ||
44 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that | |
45 | depth of recursion into the CV. | |
46 | The 0'th slot of a frame AV is an AV which is @_. | |
47 | other entries are storage for variables and op targets. | |
48 | ||
49 | During compilation: | |
a6d05634 TM |
50 | C<PL_comppad_name> is set to the names AV. |
51 | C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1. | |
52 | C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)). | |
dd2155a4 | 53 | |
f3548bdc DM |
54 | During execution, C<PL_comppad> and C<PL_curpad> refer to the live |
55 | frame of the currently executing sub. | |
56 | ||
57 | Iterating over the names AV iterates over all possible pad | |
dd2155a4 DM |
58 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
59 | &PL_sv_undef "names" (see pad_alloc()). | |
60 | ||
61 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. | |
62 | The rest are op targets/GVs/constants which are statically allocated | |
63 | or resolved at compile time. These don't have names by which they | |
64 | can be looked up from Perl code at run time through eval"" like | |
65 | my/our variables can be. Since they can't be looked up by "name" | |
66 | but only by their index allocated at compile time (which is usually | |
67 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. | |
68 | ||
69 | The SVs in the names AV have their PV being the name of the variable. | |
70 | NV+1..IV inclusive is a range of cop_seq numbers for which the name is | |
71 | valid. For typed lexicals name SV is SVt_PVMG and SvSTASH points at the | |
72 | type. For C<our> lexicals, the type is SVt_PVGV, and GvSTASH points at the | |
73 | stash of the associated global (so that duplicate C<our> delarations in the | |
74 | same package can be detected). SvCUR is sometimes hijacked to | |
75 | store the generation number during compilation. | |
76 | ||
b5c19bd7 DM |
77 | If SvFAKE is set on the name SV, then that slot in the frame AV is |
78 | a REFCNT'ed reference to a lexical from "outside". In this case, | |
79 | the name SV does not use NVX and IVX to store a cop_seq range, since it is | |
80 | in scope throughout. Instead IVX stores some flags containing info about | |
81 | the real lexical (is it declared in an anon, and is it capable of being | |
82 | instantiated multiple times?), and for fake ANONs, NVX contains the index | |
83 | within the parent's pad where the lexical's value is stored, to make | |
84 | cloning quicker. | |
dd2155a4 | 85 | |
a6d05634 | 86 | If the 'name' is '&' the corresponding entry in frame AV |
dd2155a4 DM |
87 | is a CV representing a possible closure. |
88 | (SvFAKE and name of '&' is not a meaningful combination currently but could | |
89 | become so if C<my sub foo {}> is implemented.) | |
90 | ||
71f882da DM |
91 | Note that formats are treated as anon subs, and are cloned each time |
92 | write is called (if necessary). | |
93 | ||
e6e7068b DM |
94 | The flag SVf_PADSTALE is cleared on lexicals each time the my() is executed, |
95 | and set on scope exit. This allows the 'Variable $x is not available' warning | |
96 | to be generated in evals, such as | |
97 | ||
98 | { my $x = 1; sub f { eval '$x'} } f(); | |
99 | ||
dd2155a4 DM |
100 | =cut |
101 | */ | |
102 | ||
103 | ||
104 | #include "EXTERN.h" | |
105 | #define PERL_IN_PAD_C | |
106 | #include "perl.h" | |
107 | ||
108 | ||
109 | #define PAD_MAX 999999999 | |
110 | ||
111 | ||
112 | ||
113 | /* | |
114 | =for apidoc pad_new | |
115 | ||
116 | Create a new compiling padlist, saving and updating the various global | |
117 | vars at the same time as creating the pad itself. The following flags | |
118 | can be OR'ed together: | |
119 | ||
120 | padnew_CLONE this pad is for a cloned CV | |
121 | padnew_SAVE save old globals | |
122 | padnew_SAVESUB also save extra stuff for start of sub | |
123 | ||
124 | =cut | |
125 | */ | |
126 | ||
127 | PADLIST * | |
c7c737cb | 128 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 DM |
129 | { |
130 | AV *padlist, *padname, *pad, *a0; | |
131 | ||
f3548bdc DM |
132 | ASSERT_CURPAD_LEGAL("pad_new"); |
133 | ||
dd2155a4 DM |
134 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
135 | * vars (based on flags) rather than storing vals + addresses for | |
136 | * each individually. Also see pad_block_start. | |
137 | * XXX DAPM Try to see whether all these conditionals are required | |
138 | */ | |
139 | ||
140 | /* save existing state, ... */ | |
141 | ||
142 | if (flags & padnew_SAVE) { | |
3979c56f | 143 | SAVECOMPPAD(); |
dd2155a4 DM |
144 | SAVESPTR(PL_comppad_name); |
145 | if (! (flags & padnew_CLONE)) { | |
146 | SAVEI32(PL_padix); | |
147 | SAVEI32(PL_comppad_name_fill); | |
148 | SAVEI32(PL_min_intro_pending); | |
149 | SAVEI32(PL_max_intro_pending); | |
b5c19bd7 | 150 | SAVEI32(PL_cv_has_eval); |
dd2155a4 DM |
151 | if (flags & padnew_SAVESUB) { |
152 | SAVEI32(PL_pad_reset_pending); | |
153 | } | |
154 | } | |
155 | } | |
156 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be | |
157 | * saved - check at some pt that this is okay */ | |
158 | ||
159 | /* ... create new pad ... */ | |
160 | ||
161 | padlist = newAV(); | |
162 | padname = newAV(); | |
163 | pad = newAV(); | |
164 | ||
165 | if (flags & padnew_CLONE) { | |
166 | /* XXX DAPM I dont know why cv_clone needs it | |
167 | * doing differently yet - perhaps this separate branch can be | |
168 | * dispensed with eventually ??? | |
169 | */ | |
170 | ||
171 | a0 = newAV(); /* will be @_ */ | |
172 | av_extend(a0, 0); | |
173 | av_store(pad, 0, (SV*)a0); | |
174 | AvFLAGS(a0) = AVf_REIFY; | |
175 | } | |
176 | else { | |
dd2155a4 | 177 | av_store(pad, 0, Nullsv); |
dd2155a4 DM |
178 | } |
179 | ||
180 | AvREAL_off(padlist); | |
181 | av_store(padlist, 0, (SV*)padname); | |
182 | av_store(padlist, 1, (SV*)pad); | |
183 | ||
184 | /* ... then update state variables */ | |
185 | ||
186 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); | |
187 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); | |
188 | PL_curpad = AvARRAY(PL_comppad); | |
189 | ||
190 | if (! (flags & padnew_CLONE)) { | |
191 | PL_comppad_name_fill = 0; | |
192 | PL_min_intro_pending = 0; | |
193 | PL_padix = 0; | |
b5c19bd7 | 194 | PL_cv_has_eval = 0; |
dd2155a4 DM |
195 | } |
196 | ||
197 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 198 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
dd2155a4 | 199 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
b5c19bd7 | 200 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
dd2155a4 DM |
201 | PTR2UV(padname), (UV)flags |
202 | ) | |
203 | ); | |
204 | ||
205 | return (PADLIST*)padlist; | |
206 | } | |
207 | ||
208 | /* | |
209 | =for apidoc pad_undef | |
210 | ||
211 | Free the padlist associated with a CV. | |
212 | If parts of it happen to be current, we null the relevant | |
213 | PL_*pad* global vars so that we don't have any dangling references left. | |
214 | We also repoint the CvOUTSIDE of any about-to-be-orphaned | |
a3985cdc | 215 | inner subs to the outer of this cv. |
dd2155a4 | 216 | |
7dafbf52 DM |
217 | (This function should really be called pad_free, but the name was already |
218 | taken) | |
219 | ||
dd2155a4 DM |
220 | =cut |
221 | */ | |
222 | ||
223 | void | |
a3985cdc | 224 | Perl_pad_undef(pTHX_ CV* cv) |
dd2155a4 DM |
225 | { |
226 | I32 ix; | |
227 | PADLIST *padlist = CvPADLIST(cv); | |
228 | ||
229 | if (!padlist) | |
230 | return; | |
231 | if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */ | |
232 | return; | |
233 | ||
234 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 DM |
235 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n", |
236 | PTR2UV(cv), PTR2UV(padlist)) | |
dd2155a4 DM |
237 | ); |
238 | ||
7dafbf52 DM |
239 | /* detach any '&' anon children in the pad; if afterwards they |
240 | * are still live, fix up their CvOUTSIDEs to point to our outside, | |
241 | * bypassing us. */ | |
242 | /* XXX DAPM for efficiency, we should only do this if we know we have | |
243 | * children, or integrate this loop with general cleanup */ | |
dd2155a4 | 244 | |
7dafbf52 DM |
245 | if (!PL_dirty) { /* don't bother during global destruction */ |
246 | CV *outercv = CvOUTSIDE(cv); | |
247 | U32 seq = CvOUTSIDE_SEQ(cv); | |
dd2155a4 DM |
248 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
249 | SV **namepad = AvARRAY(comppad_name); | |
250 | AV *comppad = (AV*)AvARRAY(padlist)[1]; | |
251 | SV **curpad = AvARRAY(comppad); | |
252 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { | |
253 | SV *namesv = namepad[ix]; | |
254 | if (namesv && namesv != &PL_sv_undef | |
7dafbf52 | 255 | && *SvPVX(namesv) == '&') |
dd2155a4 DM |
256 | { |
257 | CV *innercv = (CV*)curpad[ix]; | |
7dafbf52 DM |
258 | namepad[ix] = Nullsv; |
259 | SvREFCNT_dec(namesv); | |
01773faa DM |
260 | |
261 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ | |
262 | curpad[ix] = Nullsv; | |
263 | SvREFCNT_dec(innercv); | |
264 | } | |
7dafbf52 | 265 | if (SvREFCNT(innercv) /* in use, not just a prototype */ |
dd2155a4 DM |
266 | && CvOUTSIDE(innercv) == cv) |
267 | { | |
7dafbf52 | 268 | assert(CvWEAKOUTSIDE(innercv)); |
9d1ce744 JH |
269 | /* don't relink to grandfather if he's being freed */ |
270 | if (outercv && SvREFCNT(outercv)) { | |
271 | CvWEAKOUTSIDE_off(innercv); | |
272 | CvOUTSIDE(innercv) = outercv; | |
273 | CvOUTSIDE_SEQ(innercv) = seq; | |
274 | SvREFCNT_inc(outercv); | |
275 | } | |
276 | else { | |
277 | CvOUTSIDE(innercv) = Nullcv; | |
278 | } | |
279 | ||
dd2155a4 | 280 | } |
9d1ce744 | 281 | |
dd2155a4 DM |
282 | } |
283 | } | |
284 | } | |
7dafbf52 | 285 | |
dd2155a4 DM |
286 | ix = AvFILLp(padlist); |
287 | while (ix >= 0) { | |
288 | SV* sv = AvARRAY(padlist)[ix--]; | |
289 | if (!sv) | |
290 | continue; | |
291 | if (sv == (SV*)PL_comppad_name) | |
292 | PL_comppad_name = Nullav; | |
293 | else if (sv == (SV*)PL_comppad) { | |
f3548bdc | 294 | PL_comppad = Null(PAD*); |
dd2155a4 DM |
295 | PL_curpad = Null(SV**); |
296 | } | |
297 | SvREFCNT_dec(sv); | |
298 | } | |
299 | SvREFCNT_dec((SV*)CvPADLIST(cv)); | |
300 | CvPADLIST(cv) = Null(PADLIST*); | |
301 | } | |
302 | ||
303 | ||
304 | ||
305 | ||
306 | /* | |
307 | =for apidoc pad_add_name | |
308 | ||
b5c19bd7 DM |
309 | Create a new name and associated PADMY SV in the current pad; return the |
310 | offset. | |
dd2155a4 DM |
311 | If C<typestash> is valid, the name is for a typed lexical; set the |
312 | name's stash to that value. | |
313 | If C<ourstash> is valid, it's an our lexical, set the name's | |
314 | GvSTASH to that value | |
315 | ||
dd2155a4 DM |
316 | If fake, it means we're cloning an existing entry |
317 | ||
318 | =cut | |
319 | */ | |
320 | ||
dd2155a4 DM |
321 | PADOFFSET |
322 | Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) | |
323 | { | |
324 | PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); | |
325 | SV* namesv = NEWSV(1102, 0); | |
dd2155a4 | 326 | |
f3548bdc DM |
327 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
328 | ||
dd2155a4 | 329 | |
dd2155a4 DM |
330 | sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); |
331 | sv_setpv(namesv, name); | |
332 | ||
333 | if (typestash) { | |
334 | SvFLAGS(namesv) |= SVpad_TYPED; | |
335 | SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) typestash); | |
336 | } | |
337 | if (ourstash) { | |
338 | SvFLAGS(namesv) |= SVpad_OUR; | |
339 | GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash); | |
340 | } | |
341 | ||
342 | av_store(PL_comppad_name, offset, namesv); | |
b5c19bd7 | 343 | if (fake) { |
dd2155a4 | 344 | SvFAKE_on(namesv); |
b5c19bd7 DM |
345 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
346 | "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name)); | |
347 | } | |
dd2155a4 | 348 | else { |
ee6cee0c DM |
349 | /* not yet introduced */ |
350 | SvNVX(namesv) = (NV)PAD_MAX; /* min */ | |
351 | SvIVX(namesv) = 0; /* max */ | |
352 | ||
dd2155a4 DM |
353 | if (!PL_min_intro_pending) |
354 | PL_min_intro_pending = offset; | |
355 | PL_max_intro_pending = offset; | |
b5c19bd7 | 356 | /* if it's not a simple scalar, replace with an AV or HV */ |
f3548bdc DM |
357 | /* XXX DAPM since slot has been allocated, replace |
358 | * av_store with PL_curpad[offset] ? */ | |
dd2155a4 DM |
359 | if (*name == '@') |
360 | av_store(PL_comppad, offset, (SV*)newAV()); | |
361 | else if (*name == '%') | |
362 | av_store(PL_comppad, offset, (SV*)newHV()); | |
363 | SvPADMY_on(PL_curpad[offset]); | |
b5c19bd7 DM |
364 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
365 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", | |
366 | (long)offset, name, PTR2UV(PL_curpad[offset]))); | |
dd2155a4 DM |
367 | } |
368 | ||
369 | return offset; | |
370 | } | |
371 | ||
372 | ||
373 | ||
374 | ||
375 | /* | |
376 | =for apidoc pad_alloc | |
377 | ||
378 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto | |
379 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards | |
380 | for a slot which has no name and and no active value. | |
381 | ||
382 | =cut | |
383 | */ | |
384 | ||
385 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), | |
386 | * or at least rationalise ??? */ | |
387 | ||
388 | ||
389 | PADOFFSET | |
390 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) | |
391 | { | |
392 | SV *sv; | |
393 | I32 retval; | |
394 | ||
f3548bdc DM |
395 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
396 | ||
dd2155a4 DM |
397 | if (AvARRAY(PL_comppad) != PL_curpad) |
398 | Perl_croak(aTHX_ "panic: pad_alloc"); | |
399 | if (PL_pad_reset_pending) | |
400 | pad_reset(); | |
401 | if (tmptype & SVs_PADMY) { | |
235cc2e3 | 402 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
dd2155a4 DM |
403 | retval = AvFILLp(PL_comppad); |
404 | } | |
405 | else { | |
406 | SV **names = AvARRAY(PL_comppad_name); | |
407 | SSize_t names_fill = AvFILLp(PL_comppad_name); | |
408 | for (;;) { | |
409 | /* | |
410 | * "foreach" index vars temporarily become aliases to non-"my" | |
411 | * values. Thus we must skip, not just pad values that are | |
412 | * marked as current pad values, but also those with names. | |
413 | */ | |
414 | /* HVDS why copy to sv here? we don't seem to use it */ | |
415 | if (++PL_padix <= names_fill && | |
416 | (sv = names[PL_padix]) && sv != &PL_sv_undef) | |
417 | continue; | |
418 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); | |
419 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && | |
420 | !IS_PADGV(sv) && !IS_PADCONST(sv)) | |
421 | break; | |
422 | } | |
423 | retval = PL_padix; | |
424 | } | |
425 | SvFLAGS(sv) |= tmptype; | |
426 | PL_curpad = AvARRAY(PL_comppad); | |
427 | ||
428 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
429 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", | |
430 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, | |
431 | PL_op_name[optype])); | |
432 | return (PADOFFSET)retval; | |
433 | } | |
434 | ||
435 | /* | |
436 | =for apidoc pad_add_anon | |
437 | ||
438 | Add an anon code entry to the current compiling pad | |
439 | ||
440 | =cut | |
441 | */ | |
442 | ||
443 | PADOFFSET | |
444 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) | |
445 | { | |
446 | PADOFFSET ix; | |
447 | SV* name; | |
448 | ||
449 | name = NEWSV(1106, 0); | |
450 | sv_upgrade(name, SVt_PVNV); | |
451 | sv_setpvn(name, "&", 1); | |
452 | SvIVX(name) = -1; | |
453 | SvNVX(name) = 1; | |
454 | ix = pad_alloc(op_type, SVs_PADMY); | |
455 | av_store(PL_comppad_name, ix, name); | |
f3548bdc | 456 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 DM |
457 | av_store(PL_comppad, ix, sv); |
458 | SvPADMY_on(sv); | |
7dafbf52 DM |
459 | |
460 | /* to avoid ref loops, we never have parent + child referencing each | |
461 | * other simultaneously */ | |
462 | if (CvOUTSIDE((CV*)sv)) { | |
463 | assert(!CvWEAKOUTSIDE((CV*)sv)); | |
464 | CvWEAKOUTSIDE_on((CV*)sv); | |
465 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); | |
466 | } | |
dd2155a4 DM |
467 | return ix; |
468 | } | |
469 | ||
470 | ||
471 | ||
472 | /* | |
473 | =for apidoc pad_check_dup | |
474 | ||
475 | Check for duplicate declarations: report any of: | |
476 | * a my in the current scope with the same name; | |
477 | * an our (anywhere in the pad) with the same name and the same stash | |
478 | as C<ourstash> | |
479 | C<is_our> indicates that the name to check is an 'our' declaration | |
480 | ||
481 | =cut | |
482 | */ | |
483 | ||
484 | /* XXX DAPM integrate this into pad_add_name ??? */ | |
485 | ||
486 | void | |
487 | Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) | |
488 | { | |
489 | SV **svp, *sv; | |
490 | PADOFFSET top, off; | |
491 | ||
f3548bdc | 492 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
dd2155a4 DM |
493 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) |
494 | return; /* nothing to check */ | |
495 | ||
496 | svp = AvARRAY(PL_comppad_name); | |
497 | top = AvFILLp(PL_comppad_name); | |
498 | /* check the current scope */ | |
499 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same | |
500 | * type ? */ | |
501 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { | |
502 | if ((sv = svp[off]) | |
503 | && sv != &PL_sv_undef | |
ee6cee0c | 504 | && !SvFAKE(sv) |
dd2155a4 DM |
505 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
506 | && (!is_our | |
507 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) | |
508 | && strEQ(name, SvPVX(sv))) | |
509 | { | |
510 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
511 | "\"%s\" variable %s masks earlier declaration in same %s", | |
512 | (is_our ? "our" : "my"), | |
513 | name, | |
514 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); | |
515 | --off; | |
516 | break; | |
517 | } | |
518 | } | |
519 | /* check the rest of the pad */ | |
520 | if (is_our) { | |
521 | do { | |
522 | if ((sv = svp[off]) | |
523 | && sv != &PL_sv_undef | |
ee6cee0c | 524 | && !SvFAKE(sv) |
dd2155a4 DM |
525 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
526 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) | |
527 | && strEQ(name, SvPVX(sv))) | |
528 | { | |
529 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
530 | "\"our\" variable %s redeclared", name); | |
531 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
532 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
533 | break; | |
534 | } | |
535 | } while ( off-- > 0 ); | |
536 | } | |
537 | } | |
538 | ||
539 | ||
dd2155a4 DM |
540 | /* |
541 | =for apidoc pad_findmy | |
542 | ||
543 | Given a lexical name, try to find its offset, first in the current pad, | |
544 | or failing that, in the pads of any lexically enclosing subs (including | |
545 | the complications introduced by eval). If the name is found in an outer pad, | |
546 | then a fake entry is added to the current pad. | |
547 | Returns the offset in the current pad, or NOT_IN_PAD on failure. | |
548 | ||
549 | =cut | |
550 | */ | |
551 | ||
552 | PADOFFSET | |
553 | Perl_pad_findmy(pTHX_ char *name) | |
554 | { | |
b5c19bd7 DM |
555 | SV *out_sv; |
556 | int out_flags; | |
929a0744 DM |
557 | I32 offset; |
558 | AV *nameav; | |
559 | SV **name_svp; | |
dd2155a4 | 560 | |
929a0744 | 561 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
b5c19bd7 | 562 | Null(SV**), &out_sv, &out_flags); |
929a0744 DM |
563 | if (offset != NOT_IN_PAD) |
564 | return offset; | |
565 | ||
566 | /* look for an our that's being introduced; this allows | |
567 | * our $foo = 0 unless defined $foo; | |
568 | * to not give a warning. (Yes, this is a hack) */ | |
569 | ||
570 | nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; | |
571 | name_svp = AvARRAY(nameav); | |
572 | for (offset = AvFILLp(nameav); offset > 0; offset--) { | |
573 | SV *namesv = name_svp[offset]; | |
574 | if (namesv && namesv != &PL_sv_undef | |
575 | && !SvFAKE(namesv) | |
576 | && (SvFLAGS(namesv) & SVpad_OUR) | |
577 | && strEQ(SvPVX(namesv), name) | |
4cf4a199 | 578 | && U_32(SvNVX(namesv)) == PAD_MAX /* min */ |
929a0744 DM |
579 | ) |
580 | return offset; | |
581 | } | |
582 | return NOT_IN_PAD; | |
dd2155a4 DM |
583 | } |
584 | ||
e1f795dc RGS |
585 | /* |
586 | * Returns the offset of a lexical $_, if there is one, at run time. | |
587 | * Used by the UNDERBAR XS macro. | |
588 | */ | |
589 | ||
590 | PADOFFSET | |
29289021 | 591 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc RGS |
592 | { |
593 | SV *out_sv; | |
594 | int out_flags; | |
595 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, | |
596 | Null(SV**), &out_sv, &out_flags); | |
597 | } | |
dd2155a4 | 598 | |
dd2155a4 DM |
599 | /* |
600 | =for apidoc pad_findlex | |
601 | ||
602 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
b5c19bd7 DM |
603 | in the inner pads if it's found in an outer one. |
604 | ||
605 | Returns the offset in the bottom pad of the lex or the fake lex. | |
606 | cv is the CV in which to start the search, and seq is the current cop_seq | |
607 | to match against. If warn is true, print appropriate warnings. The out_* | |
608 | vars return values, and so are pointers to where the returned values | |
609 | should be stored. out_capture, if non-null, requests that the innermost | |
610 | instance of the lexical is captured; out_name_sv is set to the innermost | |
611 | matched namesv or fake namesv; out_flags returns the flags normally | |
612 | associated with the IVX field of a fake namesv. | |
613 | ||
614 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, | |
615 | then comes back down, adding fake entries as it goes. It has to be this way | |
616 | because fake namesvs in anon protoypes have to store in NVX the index into | |
617 | the parent pad. | |
dd2155a4 DM |
618 | |
619 | =cut | |
620 | */ | |
621 | ||
b5c19bd7 DM |
622 | /* Flags set in the SvIVX field of FAKE namesvs */ |
623 | ||
624 | #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */ | |
625 | #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */ | |
626 | ||
627 | /* the CV has finished being compiled. This is not a sufficient test for | |
628 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ | |
629 | #define CvCOMPILED(cv) CvROOT(cv) | |
630 | ||
71f882da DM |
631 | /* the CV does late binding of its lexicals */ |
632 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) | |
633 | ||
b5c19bd7 | 634 | |
dd2155a4 | 635 | STATIC PADOFFSET |
b5c19bd7 DM |
636 | S_pad_findlex(pTHX_ char *name, CV* cv, U32 seq, int warn, |
637 | SV** out_capture, SV** out_name_sv, int *out_flags) | |
dd2155a4 | 638 | { |
b5c19bd7 DM |
639 | I32 offset, new_offset; |
640 | SV *new_capture; | |
641 | SV **new_capturep; | |
642 | AV *padlist = CvPADLIST(cv); | |
dd2155a4 | 643 | |
b5c19bd7 | 644 | *out_flags = 0; |
a3985cdc | 645 | |
b5c19bd7 DM |
646 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
647 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", | |
648 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); | |
dd2155a4 | 649 | |
b5c19bd7 | 650 | /* first, search this pad */ |
dd2155a4 | 651 | |
b5c19bd7 DM |
652 | if (padlist) { /* not an undef CV */ |
653 | I32 fake_offset = 0; | |
654 | AV *nameav = (AV*)AvARRAY(padlist)[0]; | |
655 | SV **name_svp = AvARRAY(nameav); | |
ee6cee0c | 656 | |
b5c19bd7 DM |
657 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
658 | SV *namesv = name_svp[offset]; | |
659 | if (namesv && namesv != &PL_sv_undef | |
660 | && strEQ(SvPVX(namesv), name)) | |
661 | { | |
662 | if (SvFAKE(namesv)) | |
663 | fake_offset = offset; /* in case we don't find a real one */ | |
4cf4a199 JH |
664 | else if ( seq > U_32(SvNVX(namesv)) /* min */ |
665 | && seq <= (U32)SvIVX(namesv)) /* max */ | |
b5c19bd7 | 666 | break; |
ee6cee0c DM |
667 | } |
668 | } | |
669 | ||
b5c19bd7 DM |
670 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
671 | if (offset > 0) { /* not fake */ | |
672 | fake_offset = 0; | |
673 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
674 | ||
675 | /* set PAD_FAKELEX_MULTI if this lex can have multiple | |
676 | * instances. For now, we just test !CvUNIQUE(cv), but | |
677 | * ideally, we should detect my's declared within loops | |
678 | * etc - this would allow a wider range of 'not stayed | |
679 | * shared' warnings. We also treated alreadly-compiled | |
680 | * lexes as not multi as viewed from evals. */ | |
681 | ||
682 | *out_flags = CvANON(cv) ? | |
683 | PAD_FAKELEX_ANON : | |
684 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) | |
685 | ? PAD_FAKELEX_MULTI : 0; | |
686 | ||
687 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
688 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n", | |
4cf4a199 | 689 | PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)), |
b5c19bd7 DM |
690 | (long)SvIVX(*out_name_sv))); |
691 | } | |
692 | else { /* fake match */ | |
693 | offset = fake_offset; | |
694 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
695 | *out_flags = SvIVX(*out_name_sv); | |
696 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
19a5c512 | 697 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 DM |
698 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
699 | (unsigned long)SvNVX(*out_name_sv) | |
700 | )); | |
701 | } | |
dd2155a4 | 702 | |
b5c19bd7 | 703 | /* return the lex? */ |
dd2155a4 | 704 | |
b5c19bd7 | 705 | if (out_capture) { |
dd2155a4 | 706 | |
b5c19bd7 DM |
707 | /* our ? */ |
708 | if ((SvFLAGS(*out_name_sv) & SVpad_OUR)) { | |
709 | *out_capture = Nullsv; | |
710 | return offset; | |
711 | } | |
ee6cee0c | 712 | |
b5c19bd7 DM |
713 | /* trying to capture from an anon prototype? */ |
714 | if (CvCOMPILED(cv) | |
715 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) | |
716 | : *out_flags & PAD_FAKELEX_ANON) | |
717 | { | |
718 | if (warn && ckWARN(WARN_CLOSURE)) | |
719 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
720 | "Variable \"%s\" is not available", name); | |
721 | *out_capture = Nullsv; | |
722 | } | |
ee6cee0c | 723 | |
b5c19bd7 DM |
724 | /* real value */ |
725 | else { | |
726 | int newwarn = warn; | |
727 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) | |
728 | && warn && ckWARN(WARN_CLOSURE)) { | |
729 | newwarn = 0; | |
730 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
731 | "Variable \"%s\" will not stay shared", name); | |
732 | } | |
dd2155a4 | 733 | |
b5c19bd7 DM |
734 | if (fake_offset && CvANON(cv) |
735 | && CvCLONE(cv) &&!CvCLONED(cv)) | |
736 | { | |
737 | SV *n; | |
738 | /* not yet caught - look further up */ | |
739 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
740 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", | |
741 | PTR2UV(cv))); | |
742 | n = *out_name_sv; | |
743 | pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), | |
744 | newwarn, out_capture, out_name_sv, out_flags); | |
745 | *out_name_sv = n; | |
746 | return offset; | |
dd2155a4 | 747 | } |
b5c19bd7 DM |
748 | |
749 | *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ | |
750 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; | |
751 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
752 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", | |
19a5c512 | 753 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 DM |
754 | |
755 | if (SvPADSTALE(*out_capture)) { | |
756 | if (ckWARN(WARN_CLOSURE)) | |
ee6cee0c | 757 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b5c19bd7 DM |
758 | "Variable \"%s\" is not available", name); |
759 | *out_capture = Nullsv; | |
dd2155a4 DM |
760 | } |
761 | } | |
b5c19bd7 DM |
762 | if (!*out_capture) { |
763 | if (*name == '@') | |
764 | *out_capture = sv_2mortal((SV*)newAV()); | |
765 | else if (*name == '%') | |
766 | *out_capture = sv_2mortal((SV*)newHV()); | |
767 | else | |
768 | *out_capture = sv_newmortal(); | |
769 | } | |
dd2155a4 | 770 | } |
b5c19bd7 DM |
771 | |
772 | return offset; | |
ee6cee0c | 773 | } |
b5c19bd7 DM |
774 | } |
775 | ||
776 | /* it's not in this pad - try above */ | |
777 | ||
778 | if (!CvOUTSIDE(cv)) | |
779 | return NOT_IN_PAD; | |
780 | ||
781 | /* out_capture non-null means caller wants us to capture lex; in | |
71f882da | 782 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 | 783 | new_capturep = out_capture ? out_capture : |
71f882da | 784 | CvLATE(cv) ? Null(SV**) : &new_capture; |
b5c19bd7 DM |
785 | |
786 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, | |
787 | new_capturep, out_name_sv, out_flags); | |
788 | if (offset == NOT_IN_PAD) | |
789 | return NOT_IN_PAD; | |
790 | ||
791 | /* found in an outer CV. Add appropriate fake entry to this pad */ | |
792 | ||
793 | /* don't add new fake entries (via eval) to CVs that we have already | |
794 | * finished compiling, or to undef CVs */ | |
795 | if (CvCOMPILED(cv) || !padlist) | |
796 | return 0; /* this dummy (and invalid) value isnt used by the caller */ | |
797 | ||
798 | { | |
799 | SV *new_namesv; | |
800 | AV *ocomppad_name = PL_comppad_name; | |
801 | PAD *ocomppad = PL_comppad; | |
802 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; | |
803 | PL_comppad = (AV*)AvARRAY(padlist)[1]; | |
804 | PL_curpad = AvARRAY(PL_comppad); | |
805 | ||
806 | new_offset = pad_add_name( | |
807 | SvPVX(*out_name_sv), | |
808 | (SvFLAGS(*out_name_sv) & SVpad_TYPED) | |
809 | ? SvSTASH(*out_name_sv) : Nullhv, | |
810 | (SvFLAGS(*out_name_sv) & SVpad_OUR) | |
811 | ? GvSTASH(*out_name_sv) : Nullhv, | |
812 | 1 /* fake */ | |
813 | ); | |
814 | ||
815 | new_namesv = AvARRAY(PL_comppad_name)[new_offset]; | |
816 | SvIVX(new_namesv) = *out_flags; | |
817 | ||
818 | SvNVX(new_namesv) = (NV)0; | |
819 | if (SvFLAGS(new_namesv) & SVpad_OUR) { | |
820 | /* do nothing */ | |
821 | } | |
71f882da | 822 | else if (CvLATE(cv)) { |
b5c19bd7 DM |
823 | /* delayed creation - just note the offset within parent pad */ |
824 | SvNVX(new_namesv) = (NV)offset; | |
825 | CvCLONE_on(cv); | |
826 | } | |
827 | else { | |
828 | /* immediate creation - capture outer value right now */ | |
829 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); | |
830 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
831 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", | |
832 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); | |
dd2155a4 | 833 | } |
b5c19bd7 DM |
834 | *out_name_sv = new_namesv; |
835 | *out_flags = SvIVX(new_namesv); | |
836 | ||
837 | PL_comppad_name = ocomppad_name; | |
838 | PL_comppad = ocomppad; | |
839 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **); | |
dd2155a4 | 840 | } |
b5c19bd7 | 841 | return new_offset; |
dd2155a4 DM |
842 | } |
843 | ||
b5c19bd7 | 844 | |
dd2155a4 DM |
845 | /* |
846 | =for apidoc pad_sv | |
847 | ||
848 | Get the value at offset po in the current pad. | |
849 | Use macro PAD_SV instead of calling this function directly. | |
850 | ||
851 | =cut | |
852 | */ | |
853 | ||
854 | ||
855 | SV * | |
856 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
857 | { | |
f3548bdc | 858 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 | 859 | |
dd2155a4 DM |
860 | if (!po) |
861 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
862 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
863 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 864 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 DM |
865 | ); |
866 | return PL_curpad[po]; | |
867 | } | |
868 | ||
869 | ||
870 | /* | |
871 | =for apidoc pad_setsv | |
872 | ||
873 | Set the entry at offset po in the current pad to sv. | |
874 | Use the macro PAD_SETSV() rather than calling this function directly. | |
875 | ||
876 | =cut | |
877 | */ | |
878 | ||
879 | #ifdef DEBUGGING | |
880 | void | |
881 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
882 | { | |
f3548bdc | 883 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 DM |
884 | |
885 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
886 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 887 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 DM |
888 | ); |
889 | PL_curpad[po] = sv; | |
890 | } | |
891 | #endif | |
892 | ||
893 | ||
894 | ||
895 | /* | |
896 | =for apidoc pad_block_start | |
897 | ||
898 | Update the pad compilation state variables on entry to a new block | |
899 | ||
900 | =cut | |
901 | */ | |
902 | ||
903 | /* XXX DAPM perhaps: | |
904 | * - integrate this in general state-saving routine ??? | |
905 | * - combine with the state-saving going on in pad_new ??? | |
906 | * - introduce a new SAVE type that does all this in one go ? | |
907 | */ | |
908 | ||
909 | void | |
910 | Perl_pad_block_start(pTHX_ int full) | |
911 | { | |
f3548bdc | 912 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 DM |
913 | SAVEI32(PL_comppad_name_floor); |
914 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
915 | if (full) | |
916 | PL_comppad_name_fill = PL_comppad_name_floor; | |
917 | if (PL_comppad_name_floor < 0) | |
918 | PL_comppad_name_floor = 0; | |
919 | SAVEI32(PL_min_intro_pending); | |
920 | SAVEI32(PL_max_intro_pending); | |
921 | PL_min_intro_pending = 0; | |
922 | SAVEI32(PL_comppad_name_fill); | |
923 | SAVEI32(PL_padix_floor); | |
924 | PL_padix_floor = PL_padix; | |
925 | PL_pad_reset_pending = FALSE; | |
926 | } | |
927 | ||
928 | ||
929 | /* | |
930 | =for apidoc intro_my | |
931 | ||
932 | "Introduce" my variables to visible status. | |
933 | ||
934 | =cut | |
935 | */ | |
936 | ||
937 | U32 | |
938 | Perl_intro_my(pTHX) | |
939 | { | |
940 | SV **svp; | |
941 | SV *sv; | |
942 | I32 i; | |
943 | ||
f3548bdc | 944 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 DM |
945 | if (! PL_min_intro_pending) |
946 | return PL_cop_seqmax; | |
947 | ||
948 | svp = AvARRAY(PL_comppad_name); | |
949 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
ee6cee0c DM |
950 | if ((sv = svp[i]) && sv != &PL_sv_undef |
951 | && !SvFAKE(sv) && !SvIVX(sv)) | |
952 | { | |
dd2155a4 DM |
953 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ |
954 | SvNVX(sv) = (NV)PL_cop_seqmax; | |
955 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 956 | "Pad intromy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 | 957 | (long)i, SvPVX(sv), |
4cf4a199 | 958 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 DM |
959 | ); |
960 | } | |
961 | } | |
962 | PL_min_intro_pending = 0; | |
963 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
964 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
965 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
966 | ||
967 | return PL_cop_seqmax++; | |
968 | } | |
969 | ||
970 | /* | |
971 | =for apidoc pad_leavemy | |
972 | ||
973 | Cleanup at end of scope during compilation: set the max seq number for | |
974 | lexicals in this scope and warn of any lexicals that never got introduced. | |
975 | ||
976 | =cut | |
977 | */ | |
978 | ||
979 | void | |
980 | Perl_pad_leavemy(pTHX) | |
981 | { | |
982 | I32 off; | |
983 | SV **svp = AvARRAY(PL_comppad_name); | |
984 | SV *sv; | |
985 | ||
986 | PL_pad_reset_pending = FALSE; | |
987 | ||
f3548bdc | 988 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 DM |
989 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
990 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
ee6cee0c DM |
991 | if ((sv = svp[off]) && sv != &PL_sv_undef |
992 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) | |
dd2155a4 | 993 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
35c1215d | 994 | "%"SVf" never introduced", sv); |
dd2155a4 DM |
995 | } |
996 | } | |
997 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
998 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
ee6cee0c DM |
999 | if ((sv = svp[off]) && sv != &PL_sv_undef |
1000 | && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) | |
1001 | { | |
dd2155a4 DM |
1002 | SvIVX(sv) = PL_cop_seqmax; |
1003 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 1004 | "Pad leavemy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 | 1005 | (long)off, SvPVX(sv), |
4cf4a199 | 1006 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 DM |
1007 | ); |
1008 | } | |
1009 | } | |
1010 | PL_cop_seqmax++; | |
1011 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1012 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
1013 | } | |
1014 | ||
1015 | ||
1016 | /* | |
1017 | =for apidoc pad_swipe | |
1018 | ||
1019 | Abandon the tmp in the current pad at offset po and replace with a | |
1020 | new one. | |
1021 | ||
1022 | =cut | |
1023 | */ | |
1024 | ||
1025 | void | |
1026 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
1027 | { | |
f3548bdc | 1028 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 DM |
1029 | if (!PL_curpad) |
1030 | return; | |
1031 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1032 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
1033 | if (!po) | |
1034 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
1035 | ||
1036 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1037 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
1038 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
1039 | ||
1040 | if (PL_curpad[po]) | |
1041 | SvPADTMP_off(PL_curpad[po]); | |
1042 | if (refadjust) | |
1043 | SvREFCNT_dec(PL_curpad[po]); | |
1044 | ||
1045 | PL_curpad[po] = NEWSV(1107,0); | |
1046 | SvPADTMP_on(PL_curpad[po]); | |
1047 | if ((I32)po < PL_padix) | |
1048 | PL_padix = po - 1; | |
1049 | } | |
1050 | ||
1051 | ||
1052 | /* | |
1053 | =for apidoc pad_reset | |
1054 | ||
1055 | Mark all the current temporaries for reuse | |
1056 | ||
1057 | =cut | |
1058 | */ | |
1059 | ||
1060 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
1061 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
1062 | * on the stack by OPs that use them, there are several ways to get an alias | |
1063 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
1064 | * We avoid doing this until we can think of a Better Way. | |
1065 | * GSAR 97-10-29 */ | |
1066 | void | |
1067 | Perl_pad_reset(pTHX) | |
1068 | { | |
1069 | #ifdef USE_BROKEN_PAD_RESET | |
1070 | register I32 po; | |
1071 | ||
1072 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1073 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
1074 | ||
1075 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1076 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
1077 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1078 | (long)PL_padix, (long)PL_padix_floor | |
1079 | ) | |
1080 | ); | |
1081 | ||
1082 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
1083 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { | |
1084 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1085 | SvPADTMP_off(PL_curpad[po]); | |
1086 | } | |
1087 | PL_padix = PL_padix_floor; | |
1088 | } | |
1089 | #endif | |
1090 | PL_pad_reset_pending = FALSE; | |
1091 | } | |
1092 | ||
1093 | ||
1094 | /* | |
1095 | =for apidoc pad_tidy | |
1096 | ||
1097 | Tidy up a pad after we've finished compiling it: | |
1098 | * remove most stuff from the pads of anonsub prototypes; | |
1099 | * give it a @_; | |
1100 | * mark tmps as such. | |
1101 | ||
1102 | =cut | |
1103 | */ | |
1104 | ||
1105 | /* XXX DAPM surely most of this stuff should be done properly | |
1106 | * at the right time beforehand, rather than going around afterwards | |
1107 | * cleaning up our mistakes ??? | |
1108 | */ | |
1109 | ||
1110 | void | |
1111 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1112 | { | |
1113 | PADOFFSET ix; | |
b5c19bd7 | 1114 | CV *cv; |
dd2155a4 | 1115 | |
f3548bdc | 1116 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 DM |
1117 | |
1118 | /* If this CV has had any 'eval-capable' ops planted in it | |
1119 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any | |
1120 | * anon prototypes in the chain of CVs should be marked as cloneable, | |
1121 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets | |
1122 | * the right CvOUTSIDE. | |
1123 | * If running with -d, *any* sub may potentially have an eval | |
1124 | * excuted within it. | |
1125 | */ | |
1126 | ||
1127 | if (PL_cv_has_eval || PL_perldb) { | |
1128 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { | |
1129 | if (cv != PL_compcv && CvCOMPILED(cv)) | |
1130 | break; /* no need to mark already-compiled code */ | |
1131 | if (CvANON(cv)) { | |
1132 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1133 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); | |
1134 | CvCLONE_on(cv); | |
1135 | } | |
1136 | } | |
1137 | } | |
1138 | ||
dd2155a4 DM |
1139 | /* extend curpad to match namepad */ |
1140 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
1141 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); | |
1142 | ||
1143 | if (type == padtidy_SUBCLONE) { | |
1144 | SV **namep = AvARRAY(PL_comppad_name); | |
b5c19bd7 | 1145 | |
dd2155a4 DM |
1146 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1147 | SV *namesv; | |
1148 | ||
1149 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1150 | continue; | |
1151 | /* | |
1152 | * The only things that a clonable function needs in its | |
b5c19bd7 | 1153 | * pad are anonymous subs. |
dd2155a4 DM |
1154 | * The rest are created anew during cloning. |
1155 | */ | |
1156 | if (!((namesv = namep[ix]) != Nullsv && | |
1157 | namesv != &PL_sv_undef && | |
b5c19bd7 | 1158 | *SvPVX(namesv) == '&')) |
dd2155a4 DM |
1159 | { |
1160 | SvREFCNT_dec(PL_curpad[ix]); | |
1161 | PL_curpad[ix] = Nullsv; | |
1162 | } | |
1163 | } | |
1164 | } | |
1165 | else if (type == padtidy_SUB) { | |
1166 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
1167 | AV *av = newAV(); /* Will be @_ */ | |
1168 | av_extend(av, 0); | |
1169 | av_store(PL_comppad, 0, (SV*)av); | |
1170 | AvFLAGS(av) = AVf_REIFY; | |
1171 | } | |
1172 | ||
1173 | /* XXX DAPM rationalise these two similar branches */ | |
1174 | ||
1175 | if (type == padtidy_SUB) { | |
1176 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1177 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1178 | continue; | |
1179 | if (!SvPADMY(PL_curpad[ix])) | |
1180 | SvPADTMP_on(PL_curpad[ix]); | |
1181 | } | |
1182 | } | |
1183 | else if (type == padtidy_FORMAT) { | |
1184 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1185 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) | |
1186 | SvPADTMP_on(PL_curpad[ix]); | |
1187 | } | |
1188 | } | |
f3548bdc | 1189 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 DM |
1190 | } |
1191 | ||
1192 | ||
1193 | /* | |
1194 | =for apidoc pad_free | |
1195 | ||
1196 | Free the SV at offet po in the current pad. | |
1197 | ||
1198 | =cut | |
1199 | */ | |
1200 | ||
1201 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1202 | void | |
1203 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1204 | { | |
f3548bdc | 1205 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 DM |
1206 | if (!PL_curpad) |
1207 | return; | |
1208 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1209 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1210 | if (!po) | |
1211 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1212 | ||
1213 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1214 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1215 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1216 | ); | |
1217 | ||
1218 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1219 | SvPADTMP_off(PL_curpad[po]); | |
1220 | #ifdef USE_ITHREADS | |
7e736055 HS |
1221 | /* SV could be a shared hash key (eg bugid #19022) */ |
1222 | if ( | |
dd2155a4 | 1223 | #ifdef PERL_COPY_ON_WRITE |
7e736055 HS |
1224 | !SvIsCOW(PL_curpad[po]) |
1225 | #else | |
1226 | !SvFAKE(PL_curpad[po]) | |
dd2155a4 | 1227 | #endif |
7e736055 | 1228 | ) |
dd2155a4 | 1229 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 DM |
1230 | #endif |
1231 | } | |
1232 | if ((I32)po < PL_padix) | |
1233 | PL_padix = po - 1; | |
1234 | } | |
1235 | ||
1236 | ||
1237 | ||
1238 | /* | |
1239 | =for apidoc do_dump_pad | |
1240 | ||
1241 | Dump the contents of a padlist | |
1242 | ||
1243 | =cut | |
1244 | */ | |
1245 | ||
1246 | void | |
1247 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1248 | { | |
1249 | AV *pad_name; | |
1250 | AV *pad; | |
1251 | SV **pname; | |
1252 | SV **ppad; | |
1253 | SV *namesv; | |
1254 | I32 ix; | |
1255 | ||
1256 | if (!padlist) { | |
1257 | return; | |
1258 | } | |
1259 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); | |
1260 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); | |
1261 | pname = AvARRAY(pad_name); | |
1262 | ppad = AvARRAY(pad); | |
1263 | Perl_dump_indent(aTHX_ level, file, | |
1264 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1265 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1266 | ); | |
1267 | ||
1268 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
1269 | namesv = pname[ix]; | |
1270 | if (namesv && namesv == &PL_sv_undef) { | |
1271 | namesv = Nullsv; | |
1272 | } | |
1273 | if (namesv) { | |
ee6cee0c DM |
1274 | if (SvFAKE(namesv)) |
1275 | Perl_dump_indent(aTHX_ level+1, file, | |
c0fd1b42 | 1276 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c DM |
1277 | (int) ix, |
1278 | PTR2UV(ppad[ix]), | |
1279 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
b5c19bd7 DM |
1280 | SvPVX(namesv), |
1281 | (unsigned long)SvIVX(namesv), | |
1282 | (unsigned long)SvNVX(namesv) | |
1283 | ||
ee6cee0c DM |
1284 | ); |
1285 | else | |
1286 | Perl_dump_indent(aTHX_ level+1, file, | |
b5c19bd7 | 1287 | "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n", |
ee6cee0c DM |
1288 | (int) ix, |
1289 | PTR2UV(ppad[ix]), | |
1290 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
4cf4a199 | 1291 | (long)U_32(SvNVX(namesv)), |
b5c19bd7 | 1292 | (long)SvIVX(namesv), |
e9d09c08 | 1293 | SvPVX(namesv) |
ee6cee0c | 1294 | ); |
dd2155a4 DM |
1295 | } |
1296 | else if (full) { | |
1297 | Perl_dump_indent(aTHX_ level+1, file, | |
1298 | "%2d. 0x%"UVxf"<%lu>\n", | |
1299 | (int) ix, | |
1300 | PTR2UV(ppad[ix]), | |
1301 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1302 | ); | |
1303 | } | |
1304 | } | |
1305 | } | |
1306 | ||
1307 | ||
1308 | ||
1309 | /* | |
1310 | =for apidoc cv_dump | |
1311 | ||
1312 | dump the contents of a CV | |
1313 | ||
1314 | =cut | |
1315 | */ | |
1316 | ||
1317 | #ifdef DEBUGGING | |
1318 | STATIC void | |
1319 | S_cv_dump(pTHX_ CV *cv, char *title) | |
1320 | { | |
1321 | CV *outside = CvOUTSIDE(cv); | |
1322 | AV* padlist = CvPADLIST(cv); | |
1323 | ||
1324 | PerlIO_printf(Perl_debug_log, | |
1325 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1326 | title, | |
1327 | PTR2UV(cv), | |
1328 | (CvANON(cv) ? "ANON" | |
71f882da | 1329 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 DM |
1330 | : (cv == PL_main_cv) ? "MAIN" |
1331 | : CvUNIQUE(cv) ? "UNIQUE" | |
1332 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1333 | PTR2UV(outside), | |
1334 | (!outside ? "null" | |
1335 | : CvANON(outside) ? "ANON" | |
1336 | : (outside == PL_main_cv) ? "MAIN" | |
1337 | : CvUNIQUE(outside) ? "UNIQUE" | |
1338 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1339 | ||
1340 | PerlIO_printf(Perl_debug_log, | |
1341 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1342 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1343 | } | |
1344 | #endif /* DEBUGGING */ | |
1345 | ||
1346 | ||
1347 | ||
1348 | ||
1349 | ||
1350 | /* | |
1351 | =for apidoc cv_clone | |
1352 | ||
1353 | Clone a CV: make a new CV which points to the same code etc, but which | |
1354 | has a newly-created pad built by copying the prototype pad and capturing | |
1355 | any outer lexicals. | |
1356 | ||
1357 | =cut | |
1358 | */ | |
1359 | ||
1360 | CV * | |
1361 | Perl_cv_clone(pTHX_ CV *proto) | |
1362 | { | |
dd2155a4 DM |
1363 | I32 ix; |
1364 | AV* protopadlist = CvPADLIST(proto); | |
1365 | AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); | |
1366 | AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); | |
1367 | SV** pname = AvARRAY(protopad_name); | |
1368 | SV** ppad = AvARRAY(protopad); | |
1369 | I32 fname = AvFILLp(protopad_name); | |
1370 | I32 fpad = AvFILLp(protopad); | |
1371 | AV* comppadlist; | |
1372 | CV* cv; | |
b5c19bd7 DM |
1373 | SV** outpad; |
1374 | CV* outside; | |
71f882da | 1375 | long depth; |
dd2155a4 DM |
1376 | |
1377 | assert(!CvUNIQUE(proto)); | |
1378 | ||
71f882da DM |
1379 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1380 | * to a prototype; we instead want the cloned parent who called us. | |
1381 | * Note that in general for formats, CvOUTSIDE != find_runcv */ | |
1382 | ||
1383 | outside = CvOUTSIDE(proto); | |
1384 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) | |
1385 | outside = find_runcv(NULL); | |
1386 | depth = CvDEPTH(outside); | |
1387 | assert(depth || SvTYPE(proto) == SVt_PVFM); | |
1388 | if (!depth) | |
1389 | depth = 1; | |
b5c19bd7 DM |
1390 | assert(CvPADLIST(outside)); |
1391 | ||
dd2155a4 DM |
1392 | ENTER; |
1393 | SAVESPTR(PL_compcv); | |
1394 | ||
1395 | cv = PL_compcv = (CV*)NEWSV(1104, 0); | |
1396 | sv_upgrade((SV *)cv, SvTYPE(proto)); | |
7dafbf52 | 1397 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 DM |
1398 | CvCLONED_on(cv); |
1399 | ||
dd2155a4 DM |
1400 | #ifdef USE_ITHREADS |
1401 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) | |
1402 | : savepv(CvFILE(proto)); | |
1403 | #else | |
1404 | CvFILE(cv) = CvFILE(proto); | |
1405 | #endif | |
1406 | CvGV(cv) = CvGV(proto); | |
1407 | CvSTASH(cv) = CvSTASH(proto); | |
1408 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); | |
1409 | CvSTART(cv) = CvSTART(proto); | |
b5c19bd7 DM |
1410 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
1411 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); | |
dd2155a4 DM |
1412 | |
1413 | if (SvPOK(proto)) | |
1414 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); | |
1415 | ||
1416 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); | |
1417 | ||
b5c19bd7 | 1418 | av_fill(PL_comppad, fpad); |
dd2155a4 DM |
1419 | for (ix = fname; ix >= 0; ix--) |
1420 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1421 | ||
dd2155a4 DM |
1422 | PL_curpad = AvARRAY(PL_comppad); |
1423 | ||
71f882da | 1424 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 | 1425 | |
dd2155a4 DM |
1426 | for (ix = fpad; ix > 0; ix--) { |
1427 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; | |
71f882da DM |
1428 | SV *sv = Nullsv; |
1429 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ | |
b5c19bd7 | 1430 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
71f882da DM |
1431 | sv = outpad[(I32)SvNVX(namesv)]; |
1432 | assert(sv); | |
1433 | /* formats may have an inactive parent */ | |
1434 | if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { | |
1435 | if (ckWARN(WARN_CLOSURE)) | |
1436 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
1437 | "Variable \"%s\" is not available", SvPVX(namesv)); | |
1438 | sv = Nullsv; | |
1439 | } | |
1440 | else { | |
1441 | assert(!SvPADSTALE(sv)); | |
1442 | sv = SvREFCNT_inc(sv); | |
1443 | } | |
dd2155a4 | 1444 | } |
71f882da | 1445 | if (!sv) { |
b5c19bd7 DM |
1446 | char *name = SvPVX(namesv); |
1447 | if (*name == '&') | |
dd2155a4 | 1448 | sv = SvREFCNT_inc(ppad[ix]); |
dd2155a4 DM |
1449 | else if (*name == '@') |
1450 | sv = (SV*)newAV(); | |
1451 | else if (*name == '%') | |
1452 | sv = (SV*)newHV(); | |
1453 | else | |
1454 | sv = NEWSV(0, 0); | |
235cc2e3 | 1455 | SvPADMY_on(sv); |
dd2155a4 DM |
1456 | } |
1457 | } | |
1458 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
71f882da | 1459 | sv = SvREFCNT_inc(ppad[ix]); |
dd2155a4 DM |
1460 | } |
1461 | else { | |
b5c19bd7 | 1462 | sv = NEWSV(0, 0); |
dd2155a4 | 1463 | SvPADTMP_on(sv); |
dd2155a4 | 1464 | } |
71f882da | 1465 | PL_curpad[ix] = sv; |
dd2155a4 DM |
1466 | } |
1467 | ||
dd2155a4 DM |
1468 | DEBUG_Xv( |
1469 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1470 | cv_dump(outside, "Outside"); | |
1471 | cv_dump(proto, "Proto"); | |
1472 | cv_dump(cv, "To"); | |
1473 | ); | |
1474 | ||
1475 | LEAVE; | |
1476 | ||
1477 | if (CvCONST(cv)) { | |
b5c19bd7 DM |
1478 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1479 | * The prototype was marked as a candiate for const-ization, | |
1480 | * so try to grab the current const value, and if successful, | |
1481 | * turn into a const sub: | |
1482 | */ | |
dd2155a4 | 1483 | SV* const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 DM |
1484 | if (const_sv) { |
1485 | SvREFCNT_dec(cv); | |
1486 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); | |
1487 | } | |
1488 | else { | |
1489 | CvCONST_off(cv); | |
1490 | } | |
dd2155a4 DM |
1491 | } |
1492 | ||
1493 | return cv; | |
1494 | } | |
1495 | ||
1496 | ||
1497 | /* | |
1498 | =for apidoc pad_fixup_inner_anons | |
1499 | ||
1500 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
7dafbf52 DM |
1501 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1502 | moved to a pre-existing CV struct. | |
dd2155a4 DM |
1503 | |
1504 | =cut | |
1505 | */ | |
1506 | ||
1507 | void | |
1508 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1509 | { | |
1510 | I32 ix; | |
1511 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; | |
1512 | AV *comppad = (AV*)AvARRAY(padlist)[1]; | |
1513 | SV **namepad = AvARRAY(comppad_name); | |
1514 | SV **curpad = AvARRAY(comppad); | |
1515 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { | |
1516 | SV *namesv = namepad[ix]; | |
1517 | if (namesv && namesv != &PL_sv_undef | |
1518 | && *SvPVX(namesv) == '&') | |
1519 | { | |
1520 | CV *innercv = (CV*)curpad[ix]; | |
7dafbf52 DM |
1521 | assert(CvWEAKOUTSIDE(innercv)); |
1522 | assert(CvOUTSIDE(innercv) == old_cv); | |
1523 | CvOUTSIDE(innercv) = new_cv; | |
dd2155a4 DM |
1524 | } |
1525 | } | |
1526 | } | |
1527 | ||
7dafbf52 | 1528 | |
dd2155a4 DM |
1529 | /* |
1530 | =for apidoc pad_push | |
1531 | ||
1532 | Push a new pad frame onto the padlist, unless there's already a pad at | |
1533 | this depth, in which case don't bother creating a new one. | |
1534 | If has_args is true, give the new pad an @_ in slot zero. | |
1535 | ||
1536 | =cut | |
1537 | */ | |
1538 | ||
ff0adf16 DM |
1539 | /* XXX pad_push is now always called with has_args == 1. Get rid of |
1540 | * this arg at some point */ | |
1541 | ||
dd2155a4 DM |
1542 | void |
1543 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) | |
1544 | { | |
1545 | if (depth <= AvFILLp(padlist)) | |
1546 | return; | |
1547 | ||
1548 | { | |
1549 | SV** svp = AvARRAY(padlist); | |
1550 | AV *newpad = newAV(); | |
1551 | SV **oldpad = AvARRAY(svp[depth-1]); | |
1552 | I32 ix = AvFILLp((AV*)svp[1]); | |
1553 | I32 names_fill = AvFILLp((AV*)svp[0]); | |
1554 | SV** names = AvARRAY(svp[0]); | |
1555 | SV* sv; | |
1556 | for ( ;ix > 0; ix--) { | |
1557 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
1558 | char *name = SvPVX(names[ix]); | |
1559 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || *name == '&') { | |
1560 | /* outer lexical or anon code */ | |
1561 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1562 | } | |
1563 | else { /* our own lexical */ | |
1564 | if (*name == '@') | |
1565 | av_store(newpad, ix, sv = (SV*)newAV()); | |
1566 | else if (*name == '%') | |
1567 | av_store(newpad, ix, sv = (SV*)newHV()); | |
1568 | else | |
1569 | av_store(newpad, ix, sv = NEWSV(0, 0)); | |
1570 | SvPADMY_on(sv); | |
1571 | } | |
1572 | } | |
1573 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
1574 | av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix])); | |
1575 | } | |
1576 | else { | |
1577 | /* save temporaries on recursion? */ | |
1578 | av_store(newpad, ix, sv = NEWSV(0, 0)); | |
1579 | SvPADTMP_on(sv); | |
1580 | } | |
1581 | } | |
1582 | if (has_args) { | |
1583 | AV* av = newAV(); | |
1584 | av_extend(av, 0); | |
1585 | av_store(newpad, 0, (SV*)av); | |
1586 | AvFLAGS(av) = AVf_REIFY; | |
1587 | } | |
1588 | av_store(padlist, depth, (SV*)newpad); | |
1589 | AvFILLp(padlist) = depth; | |
1590 | } | |
1591 | } |