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