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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 | ||
61296642 | 25 | This file contains the functions that create and manipulate scratchpads, |
166f8a29 | 26 | which are array-of-array data structures attached to a CV (ie a sub) |
61296642 | 27 | and which store lexical variables and opcode temporary and per-thread |
166f8a29 DM |
28 | values. |
29 | ||
dd2155a4 DM |
30 | =for apidoc m|AV *|CvPADLIST|CV *cv |
31 | CV's can have CvPADLIST(cv) set to point to an AV. | |
32 | ||
33 | For these purposes "forms" are a kind-of CV, eval""s are too (except they're | |
34 | not callable at will and are always thrown away after the eval"" is done | |
b5c19bd7 DM |
35 | executing). Require'd files are simply evals without any outer lexical |
36 | scope. | |
dd2155a4 DM |
37 | |
38 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, | |
39 | but that is really the callers pad (a slot of which is allocated by | |
40 | every entersub). | |
41 | ||
42 | The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items | |
f3548bdc | 43 | is managed "manual" (mostly in pad.c) rather than normal av.c rules. |
dd2155a4 DM |
44 | The items in the AV are not SVs as for a normal AV, but other AVs: |
45 | ||
46 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather | |
47 | the "static type information" for lexicals. | |
48 | ||
49 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that | |
50 | depth of recursion into the CV. | |
51 | The 0'th slot of a frame AV is an AV which is @_. | |
52 | other entries are storage for variables and op targets. | |
53 | ||
54 | During compilation: | |
a6d05634 TM |
55 | C<PL_comppad_name> is set to the names AV. |
56 | C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1. | |
57 | C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)). | |
dd2155a4 | 58 | |
f3548bdc DM |
59 | During execution, C<PL_comppad> and C<PL_curpad> refer to the live |
60 | frame of the currently executing sub. | |
61 | ||
62 | Iterating over the names AV iterates over all possible pad | |
dd2155a4 DM |
63 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
64 | &PL_sv_undef "names" (see pad_alloc()). | |
65 | ||
66 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. | |
67 | The rest are op targets/GVs/constants which are statically allocated | |
68 | or resolved at compile time. These don't have names by which they | |
69 | can be looked up from Perl code at run time through eval"" like | |
70 | my/our variables can be. Since they can't be looked up by "name" | |
71 | but only by their index allocated at compile time (which is usually | |
72 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. | |
73 | ||
74 | The SVs in the names AV have their PV being the name of the variable. | |
75 | NV+1..IV inclusive is a range of cop_seq numbers for which the name is | |
76 | valid. For typed lexicals name SV is SVt_PVMG and SvSTASH points at the | |
77 | type. For C<our> lexicals, the type is SVt_PVGV, and GvSTASH points at the | |
78 | stash of the associated global (so that duplicate C<our> delarations in the | |
79 | same package can be detected). SvCUR is sometimes hijacked to | |
80 | store the generation number during compilation. | |
81 | ||
b5c19bd7 DM |
82 | If SvFAKE is set on the name SV, then that slot in the frame AV is |
83 | a REFCNT'ed reference to a lexical from "outside". In this case, | |
84 | the name SV does not use NVX and IVX to store a cop_seq range, since it is | |
85 | in scope throughout. Instead IVX stores some flags containing info about | |
86 | the real lexical (is it declared in an anon, and is it capable of being | |
87 | instantiated multiple times?), and for fake ANONs, NVX contains the index | |
88 | within the parent's pad where the lexical's value is stored, to make | |
89 | cloning quicker. | |
dd2155a4 | 90 | |
a6d05634 | 91 | If the 'name' is '&' the corresponding entry in frame AV |
dd2155a4 DM |
92 | is a CV representing a possible closure. |
93 | (SvFAKE and name of '&' is not a meaningful combination currently but could | |
94 | become so if C<my sub foo {}> is implemented.) | |
95 | ||
71f882da DM |
96 | Note that formats are treated as anon subs, and are cloned each time |
97 | write is called (if necessary). | |
98 | ||
e6e7068b DM |
99 | The flag SVf_PADSTALE is cleared on lexicals each time the my() is executed, |
100 | and set on scope exit. This allows the 'Variable $x is not available' warning | |
101 | to be generated in evals, such as | |
102 | ||
103 | { my $x = 1; sub f { eval '$x'} } f(); | |
104 | ||
dd2155a4 DM |
105 | =cut |
106 | */ | |
107 | ||
108 | ||
109 | #include "EXTERN.h" | |
110 | #define PERL_IN_PAD_C | |
111 | #include "perl.h" | |
112 | ||
113 | ||
114 | #define PAD_MAX 999999999 | |
115 | ||
116 | ||
117 | ||
118 | /* | |
119 | =for apidoc pad_new | |
120 | ||
121 | Create a new compiling padlist, saving and updating the various global | |
122 | vars at the same time as creating the pad itself. The following flags | |
123 | can be OR'ed together: | |
124 | ||
125 | padnew_CLONE this pad is for a cloned CV | |
126 | padnew_SAVE save old globals | |
127 | padnew_SAVESUB also save extra stuff for start of sub | |
128 | ||
129 | =cut | |
130 | */ | |
131 | ||
132 | PADLIST * | |
c7c737cb | 133 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 DM |
134 | { |
135 | AV *padlist, *padname, *pad, *a0; | |
136 | ||
f3548bdc DM |
137 | ASSERT_CURPAD_LEGAL("pad_new"); |
138 | ||
dd2155a4 DM |
139 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
140 | * vars (based on flags) rather than storing vals + addresses for | |
141 | * each individually. Also see pad_block_start. | |
142 | * XXX DAPM Try to see whether all these conditionals are required | |
143 | */ | |
144 | ||
145 | /* save existing state, ... */ | |
146 | ||
147 | if (flags & padnew_SAVE) { | |
3979c56f | 148 | SAVECOMPPAD(); |
dd2155a4 DM |
149 | SAVESPTR(PL_comppad_name); |
150 | if (! (flags & padnew_CLONE)) { | |
151 | SAVEI32(PL_padix); | |
152 | SAVEI32(PL_comppad_name_fill); | |
153 | SAVEI32(PL_min_intro_pending); | |
154 | SAVEI32(PL_max_intro_pending); | |
b5c19bd7 | 155 | SAVEI32(PL_cv_has_eval); |
dd2155a4 DM |
156 | if (flags & padnew_SAVESUB) { |
157 | SAVEI32(PL_pad_reset_pending); | |
158 | } | |
159 | } | |
160 | } | |
161 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be | |
162 | * saved - check at some pt that this is okay */ | |
163 | ||
164 | /* ... create new pad ... */ | |
165 | ||
166 | padlist = newAV(); | |
167 | padname = newAV(); | |
168 | pad = newAV(); | |
169 | ||
170 | if (flags & padnew_CLONE) { | |
171 | /* XXX DAPM I dont know why cv_clone needs it | |
172 | * doing differently yet - perhaps this separate branch can be | |
173 | * dispensed with eventually ??? | |
174 | */ | |
175 | ||
176 | a0 = newAV(); /* will be @_ */ | |
177 | av_extend(a0, 0); | |
178 | av_store(pad, 0, (SV*)a0); | |
179 | AvFLAGS(a0) = AVf_REIFY; | |
180 | } | |
181 | else { | |
dd2155a4 | 182 | av_store(pad, 0, Nullsv); |
dd2155a4 DM |
183 | } |
184 | ||
185 | AvREAL_off(padlist); | |
186 | av_store(padlist, 0, (SV*)padname); | |
187 | av_store(padlist, 1, (SV*)pad); | |
188 | ||
189 | /* ... then update state variables */ | |
190 | ||
191 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); | |
192 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); | |
193 | PL_curpad = AvARRAY(PL_comppad); | |
194 | ||
195 | if (! (flags & padnew_CLONE)) { | |
196 | PL_comppad_name_fill = 0; | |
197 | PL_min_intro_pending = 0; | |
198 | PL_padix = 0; | |
b5c19bd7 | 199 | PL_cv_has_eval = 0; |
dd2155a4 DM |
200 | } |
201 | ||
202 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 203 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
dd2155a4 | 204 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
b5c19bd7 | 205 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
dd2155a4 DM |
206 | PTR2UV(padname), (UV)flags |
207 | ) | |
208 | ); | |
209 | ||
210 | return (PADLIST*)padlist; | |
211 | } | |
212 | ||
213 | /* | |
214 | =for apidoc pad_undef | |
215 | ||
216 | Free the padlist associated with a CV. | |
217 | If parts of it happen to be current, we null the relevant | |
218 | PL_*pad* global vars so that we don't have any dangling references left. | |
219 | We also repoint the CvOUTSIDE of any about-to-be-orphaned | |
a3985cdc | 220 | inner subs to the outer of this cv. |
dd2155a4 | 221 | |
7dafbf52 DM |
222 | (This function should really be called pad_free, but the name was already |
223 | taken) | |
224 | ||
dd2155a4 DM |
225 | =cut |
226 | */ | |
227 | ||
228 | void | |
a3985cdc | 229 | Perl_pad_undef(pTHX_ CV* cv) |
dd2155a4 DM |
230 | { |
231 | I32 ix; | |
232 | PADLIST *padlist = CvPADLIST(cv); | |
233 | ||
234 | if (!padlist) | |
235 | return; | |
236 | if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */ | |
237 | return; | |
238 | ||
239 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 DM |
240 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n", |
241 | PTR2UV(cv), PTR2UV(padlist)) | |
dd2155a4 DM |
242 | ); |
243 | ||
7dafbf52 DM |
244 | /* detach any '&' anon children in the pad; if afterwards they |
245 | * are still live, fix up their CvOUTSIDEs to point to our outside, | |
246 | * bypassing us. */ | |
247 | /* XXX DAPM for efficiency, we should only do this if we know we have | |
248 | * children, or integrate this loop with general cleanup */ | |
dd2155a4 | 249 | |
7dafbf52 DM |
250 | if (!PL_dirty) { /* don't bother during global destruction */ |
251 | CV *outercv = CvOUTSIDE(cv); | |
252 | U32 seq = CvOUTSIDE_SEQ(cv); | |
dd2155a4 DM |
253 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
254 | SV **namepad = AvARRAY(comppad_name); | |
255 | AV *comppad = (AV*)AvARRAY(padlist)[1]; | |
256 | SV **curpad = AvARRAY(comppad); | |
257 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { | |
258 | SV *namesv = namepad[ix]; | |
259 | if (namesv && namesv != &PL_sv_undef | |
7dafbf52 | 260 | && *SvPVX(namesv) == '&') |
dd2155a4 DM |
261 | { |
262 | CV *innercv = (CV*)curpad[ix]; | |
7dafbf52 DM |
263 | namepad[ix] = Nullsv; |
264 | SvREFCNT_dec(namesv); | |
01773faa DM |
265 | |
266 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ | |
267 | curpad[ix] = Nullsv; | |
268 | SvREFCNT_dec(innercv); | |
269 | } | |
7dafbf52 | 270 | if (SvREFCNT(innercv) /* in use, not just a prototype */ |
dd2155a4 DM |
271 | && CvOUTSIDE(innercv) == cv) |
272 | { | |
7dafbf52 | 273 | assert(CvWEAKOUTSIDE(innercv)); |
9d1ce744 JH |
274 | /* don't relink to grandfather if he's being freed */ |
275 | if (outercv && SvREFCNT(outercv)) { | |
276 | CvWEAKOUTSIDE_off(innercv); | |
277 | CvOUTSIDE(innercv) = outercv; | |
278 | CvOUTSIDE_SEQ(innercv) = seq; | |
279 | SvREFCNT_inc(outercv); | |
280 | } | |
281 | else { | |
282 | CvOUTSIDE(innercv) = Nullcv; | |
283 | } | |
284 | ||
dd2155a4 | 285 | } |
9d1ce744 | 286 | |
dd2155a4 DM |
287 | } |
288 | } | |
289 | } | |
7dafbf52 | 290 | |
dd2155a4 DM |
291 | ix = AvFILLp(padlist); |
292 | while (ix >= 0) { | |
293 | SV* sv = AvARRAY(padlist)[ix--]; | |
294 | if (!sv) | |
295 | continue; | |
296 | if (sv == (SV*)PL_comppad_name) | |
297 | PL_comppad_name = Nullav; | |
298 | else if (sv == (SV*)PL_comppad) { | |
f3548bdc | 299 | PL_comppad = Null(PAD*); |
dd2155a4 DM |
300 | PL_curpad = Null(SV**); |
301 | } | |
302 | SvREFCNT_dec(sv); | |
303 | } | |
304 | SvREFCNT_dec((SV*)CvPADLIST(cv)); | |
305 | CvPADLIST(cv) = Null(PADLIST*); | |
306 | } | |
307 | ||
308 | ||
309 | ||
310 | ||
311 | /* | |
312 | =for apidoc pad_add_name | |
313 | ||
b5c19bd7 DM |
314 | Create a new name and associated PADMY SV in the current pad; return the |
315 | offset. | |
dd2155a4 DM |
316 | If C<typestash> is valid, the name is for a typed lexical; set the |
317 | name's stash to that value. | |
318 | If C<ourstash> is valid, it's an our lexical, set the name's | |
319 | GvSTASH to that value | |
320 | ||
dd2155a4 DM |
321 | If fake, it means we're cloning an existing entry |
322 | ||
323 | =cut | |
324 | */ | |
325 | ||
dd2155a4 DM |
326 | PADOFFSET |
327 | Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) | |
328 | { | |
329 | PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); | |
330 | SV* namesv = NEWSV(1102, 0); | |
dd2155a4 | 331 | |
f3548bdc DM |
332 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
333 | ||
dd2155a4 | 334 | |
dd2155a4 DM |
335 | sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); |
336 | sv_setpv(namesv, name); | |
337 | ||
338 | if (typestash) { | |
339 | SvFLAGS(namesv) |= SVpad_TYPED; | |
340 | SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) typestash); | |
341 | } | |
342 | if (ourstash) { | |
343 | SvFLAGS(namesv) |= SVpad_OUR; | |
344 | GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash); | |
345 | } | |
346 | ||
347 | av_store(PL_comppad_name, offset, namesv); | |
b5c19bd7 | 348 | if (fake) { |
dd2155a4 | 349 | SvFAKE_on(namesv); |
b5c19bd7 DM |
350 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
351 | "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name)); | |
352 | } | |
dd2155a4 | 353 | else { |
ee6cee0c DM |
354 | /* not yet introduced */ |
355 | SvNVX(namesv) = (NV)PAD_MAX; /* min */ | |
356 | SvIVX(namesv) = 0; /* max */ | |
357 | ||
dd2155a4 DM |
358 | if (!PL_min_intro_pending) |
359 | PL_min_intro_pending = offset; | |
360 | PL_max_intro_pending = offset; | |
b5c19bd7 | 361 | /* if it's not a simple scalar, replace with an AV or HV */ |
f3548bdc DM |
362 | /* XXX DAPM since slot has been allocated, replace |
363 | * av_store with PL_curpad[offset] ? */ | |
dd2155a4 DM |
364 | if (*name == '@') |
365 | av_store(PL_comppad, offset, (SV*)newAV()); | |
366 | else if (*name == '%') | |
367 | av_store(PL_comppad, offset, (SV*)newHV()); | |
368 | SvPADMY_on(PL_curpad[offset]); | |
b5c19bd7 DM |
369 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
370 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", | |
371 | (long)offset, name, PTR2UV(PL_curpad[offset]))); | |
dd2155a4 DM |
372 | } |
373 | ||
374 | return offset; | |
375 | } | |
376 | ||
377 | ||
378 | ||
379 | ||
380 | /* | |
381 | =for apidoc pad_alloc | |
382 | ||
383 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto | |
384 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards | |
385 | for a slot which has no name and and no active value. | |
386 | ||
387 | =cut | |
388 | */ | |
389 | ||
390 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), | |
391 | * or at least rationalise ??? */ | |
392 | ||
393 | ||
394 | PADOFFSET | |
395 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) | |
396 | { | |
397 | SV *sv; | |
398 | I32 retval; | |
399 | ||
f3548bdc DM |
400 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
401 | ||
dd2155a4 DM |
402 | if (AvARRAY(PL_comppad) != PL_curpad) |
403 | Perl_croak(aTHX_ "panic: pad_alloc"); | |
404 | if (PL_pad_reset_pending) | |
405 | pad_reset(); | |
406 | if (tmptype & SVs_PADMY) { | |
235cc2e3 | 407 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
dd2155a4 DM |
408 | retval = AvFILLp(PL_comppad); |
409 | } | |
410 | else { | |
411 | SV **names = AvARRAY(PL_comppad_name); | |
412 | SSize_t names_fill = AvFILLp(PL_comppad_name); | |
413 | for (;;) { | |
414 | /* | |
415 | * "foreach" index vars temporarily become aliases to non-"my" | |
416 | * values. Thus we must skip, not just pad values that are | |
417 | * marked as current pad values, but also those with names. | |
418 | */ | |
419 | /* HVDS why copy to sv here? we don't seem to use it */ | |
420 | if (++PL_padix <= names_fill && | |
421 | (sv = names[PL_padix]) && sv != &PL_sv_undef) | |
422 | continue; | |
423 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); | |
424 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && | |
425 | !IS_PADGV(sv) && !IS_PADCONST(sv)) | |
426 | break; | |
427 | } | |
428 | retval = PL_padix; | |
429 | } | |
430 | SvFLAGS(sv) |= tmptype; | |
431 | PL_curpad = AvARRAY(PL_comppad); | |
432 | ||
433 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
434 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", | |
435 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, | |
436 | PL_op_name[optype])); | |
437 | return (PADOFFSET)retval; | |
438 | } | |
439 | ||
440 | /* | |
441 | =for apidoc pad_add_anon | |
442 | ||
443 | Add an anon code entry to the current compiling pad | |
444 | ||
445 | =cut | |
446 | */ | |
447 | ||
448 | PADOFFSET | |
449 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) | |
450 | { | |
451 | PADOFFSET ix; | |
452 | SV* name; | |
453 | ||
454 | name = NEWSV(1106, 0); | |
455 | sv_upgrade(name, SVt_PVNV); | |
456 | sv_setpvn(name, "&", 1); | |
457 | SvIVX(name) = -1; | |
458 | SvNVX(name) = 1; | |
459 | ix = pad_alloc(op_type, SVs_PADMY); | |
460 | av_store(PL_comppad_name, ix, name); | |
f3548bdc | 461 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 DM |
462 | av_store(PL_comppad, ix, sv); |
463 | SvPADMY_on(sv); | |
7dafbf52 DM |
464 | |
465 | /* to avoid ref loops, we never have parent + child referencing each | |
466 | * other simultaneously */ | |
467 | if (CvOUTSIDE((CV*)sv)) { | |
468 | assert(!CvWEAKOUTSIDE((CV*)sv)); | |
469 | CvWEAKOUTSIDE_on((CV*)sv); | |
470 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); | |
471 | } | |
dd2155a4 DM |
472 | return ix; |
473 | } | |
474 | ||
475 | ||
476 | ||
477 | /* | |
478 | =for apidoc pad_check_dup | |
479 | ||
480 | Check for duplicate declarations: report any of: | |
481 | * a my in the current scope with the same name; | |
482 | * an our (anywhere in the pad) with the same name and the same stash | |
483 | as C<ourstash> | |
484 | C<is_our> indicates that the name to check is an 'our' declaration | |
485 | ||
486 | =cut | |
487 | */ | |
488 | ||
489 | /* XXX DAPM integrate this into pad_add_name ??? */ | |
490 | ||
491 | void | |
492 | Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) | |
493 | { | |
494 | SV **svp, *sv; | |
495 | PADOFFSET top, off; | |
496 | ||
f3548bdc | 497 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
dd2155a4 DM |
498 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) |
499 | return; /* nothing to check */ | |
500 | ||
501 | svp = AvARRAY(PL_comppad_name); | |
502 | top = AvFILLp(PL_comppad_name); | |
503 | /* check the current scope */ | |
504 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same | |
505 | * type ? */ | |
506 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { | |
507 | if ((sv = svp[off]) | |
508 | && sv != &PL_sv_undef | |
ee6cee0c | 509 | && !SvFAKE(sv) |
dd2155a4 DM |
510 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
511 | && (!is_our | |
512 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) | |
513 | && strEQ(name, SvPVX(sv))) | |
514 | { | |
515 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
516 | "\"%s\" variable %s masks earlier declaration in same %s", | |
517 | (is_our ? "our" : "my"), | |
518 | name, | |
519 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); | |
520 | --off; | |
521 | break; | |
522 | } | |
523 | } | |
524 | /* check the rest of the pad */ | |
525 | if (is_our) { | |
526 | do { | |
527 | if ((sv = svp[off]) | |
528 | && sv != &PL_sv_undef | |
ee6cee0c | 529 | && !SvFAKE(sv) |
dd2155a4 DM |
530 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
531 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) | |
532 | && strEQ(name, SvPVX(sv))) | |
533 | { | |
534 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
535 | "\"our\" variable %s redeclared", name); | |
536 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
537 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
538 | break; | |
539 | } | |
540 | } while ( off-- > 0 ); | |
541 | } | |
542 | } | |
543 | ||
544 | ||
dd2155a4 DM |
545 | /* |
546 | =for apidoc pad_findmy | |
547 | ||
548 | Given a lexical name, try to find its offset, first in the current pad, | |
549 | or failing that, in the pads of any lexically enclosing subs (including | |
550 | the complications introduced by eval). If the name is found in an outer pad, | |
551 | then a fake entry is added to the current pad. | |
552 | Returns the offset in the current pad, or NOT_IN_PAD on failure. | |
553 | ||
554 | =cut | |
555 | */ | |
556 | ||
557 | PADOFFSET | |
558 | Perl_pad_findmy(pTHX_ char *name) | |
559 | { | |
b5c19bd7 DM |
560 | SV *out_sv; |
561 | int out_flags; | |
929a0744 DM |
562 | I32 offset; |
563 | AV *nameav; | |
564 | SV **name_svp; | |
dd2155a4 | 565 | |
929a0744 | 566 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
b5c19bd7 | 567 | Null(SV**), &out_sv, &out_flags); |
929a0744 DM |
568 | if (offset != NOT_IN_PAD) |
569 | return offset; | |
570 | ||
571 | /* look for an our that's being introduced; this allows | |
572 | * our $foo = 0 unless defined $foo; | |
573 | * to not give a warning. (Yes, this is a hack) */ | |
574 | ||
575 | nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; | |
576 | name_svp = AvARRAY(nameav); | |
577 | for (offset = AvFILLp(nameav); offset > 0; offset--) { | |
578 | SV *namesv = name_svp[offset]; | |
579 | if (namesv && namesv != &PL_sv_undef | |
580 | && !SvFAKE(namesv) | |
581 | && (SvFLAGS(namesv) & SVpad_OUR) | |
582 | && strEQ(SvPVX(namesv), name) | |
4cf4a199 | 583 | && U_32(SvNVX(namesv)) == PAD_MAX /* min */ |
929a0744 DM |
584 | ) |
585 | return offset; | |
586 | } | |
587 | return NOT_IN_PAD; | |
dd2155a4 DM |
588 | } |
589 | ||
e1f795dc RGS |
590 | /* |
591 | * Returns the offset of a lexical $_, if there is one, at run time. | |
592 | * Used by the UNDERBAR XS macro. | |
593 | */ | |
594 | ||
595 | PADOFFSET | |
29289021 | 596 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc RGS |
597 | { |
598 | SV *out_sv; | |
599 | int out_flags; | |
600 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, | |
601 | Null(SV**), &out_sv, &out_flags); | |
602 | } | |
dd2155a4 | 603 | |
dd2155a4 DM |
604 | /* |
605 | =for apidoc pad_findlex | |
606 | ||
607 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
b5c19bd7 DM |
608 | in the inner pads if it's found in an outer one. |
609 | ||
610 | Returns the offset in the bottom pad of the lex or the fake lex. | |
611 | cv is the CV in which to start the search, and seq is the current cop_seq | |
612 | to match against. If warn is true, print appropriate warnings. The out_* | |
613 | vars return values, and so are pointers to where the returned values | |
614 | should be stored. out_capture, if non-null, requests that the innermost | |
615 | instance of the lexical is captured; out_name_sv is set to the innermost | |
616 | matched namesv or fake namesv; out_flags returns the flags normally | |
617 | associated with the IVX field of a fake namesv. | |
618 | ||
619 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, | |
620 | then comes back down, adding fake entries as it goes. It has to be this way | |
621 | because fake namesvs in anon protoypes have to store in NVX the index into | |
622 | the parent pad. | |
dd2155a4 DM |
623 | |
624 | =cut | |
625 | */ | |
626 | ||
b5c19bd7 DM |
627 | /* Flags set in the SvIVX field of FAKE namesvs */ |
628 | ||
629 | #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */ | |
630 | #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */ | |
631 | ||
632 | /* the CV has finished being compiled. This is not a sufficient test for | |
633 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ | |
634 | #define CvCOMPILED(cv) CvROOT(cv) | |
635 | ||
71f882da DM |
636 | /* the CV does late binding of its lexicals */ |
637 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) | |
638 | ||
b5c19bd7 | 639 | |
dd2155a4 | 640 | STATIC PADOFFSET |
b5c19bd7 DM |
641 | S_pad_findlex(pTHX_ char *name, CV* cv, U32 seq, int warn, |
642 | SV** out_capture, SV** out_name_sv, int *out_flags) | |
dd2155a4 | 643 | { |
b5c19bd7 DM |
644 | I32 offset, new_offset; |
645 | SV *new_capture; | |
646 | SV **new_capturep; | |
647 | AV *padlist = CvPADLIST(cv); | |
dd2155a4 | 648 | |
b5c19bd7 | 649 | *out_flags = 0; |
a3985cdc | 650 | |
b5c19bd7 DM |
651 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
652 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", | |
653 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); | |
dd2155a4 | 654 | |
b5c19bd7 | 655 | /* first, search this pad */ |
dd2155a4 | 656 | |
b5c19bd7 DM |
657 | if (padlist) { /* not an undef CV */ |
658 | I32 fake_offset = 0; | |
659 | AV *nameav = (AV*)AvARRAY(padlist)[0]; | |
660 | SV **name_svp = AvARRAY(nameav); | |
ee6cee0c | 661 | |
b5c19bd7 DM |
662 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
663 | SV *namesv = name_svp[offset]; | |
664 | if (namesv && namesv != &PL_sv_undef | |
665 | && strEQ(SvPVX(namesv), name)) | |
666 | { | |
667 | if (SvFAKE(namesv)) | |
668 | fake_offset = offset; /* in case we don't find a real one */ | |
4cf4a199 JH |
669 | else if ( seq > U_32(SvNVX(namesv)) /* min */ |
670 | && seq <= (U32)SvIVX(namesv)) /* max */ | |
b5c19bd7 | 671 | break; |
ee6cee0c DM |
672 | } |
673 | } | |
674 | ||
b5c19bd7 DM |
675 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
676 | if (offset > 0) { /* not fake */ | |
677 | fake_offset = 0; | |
678 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
679 | ||
680 | /* set PAD_FAKELEX_MULTI if this lex can have multiple | |
681 | * instances. For now, we just test !CvUNIQUE(cv), but | |
682 | * ideally, we should detect my's declared within loops | |
683 | * etc - this would allow a wider range of 'not stayed | |
684 | * shared' warnings. We also treated alreadly-compiled | |
685 | * lexes as not multi as viewed from evals. */ | |
686 | ||
687 | *out_flags = CvANON(cv) ? | |
688 | PAD_FAKELEX_ANON : | |
689 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) | |
690 | ? PAD_FAKELEX_MULTI : 0; | |
691 | ||
692 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
693 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n", | |
4cf4a199 | 694 | PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)), |
b5c19bd7 DM |
695 | (long)SvIVX(*out_name_sv))); |
696 | } | |
697 | else { /* fake match */ | |
698 | offset = fake_offset; | |
699 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
700 | *out_flags = SvIVX(*out_name_sv); | |
701 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
19a5c512 | 702 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 DM |
703 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
704 | (unsigned long)SvNVX(*out_name_sv) | |
705 | )); | |
706 | } | |
dd2155a4 | 707 | |
b5c19bd7 | 708 | /* return the lex? */ |
dd2155a4 | 709 | |
b5c19bd7 | 710 | if (out_capture) { |
dd2155a4 | 711 | |
b5c19bd7 DM |
712 | /* our ? */ |
713 | if ((SvFLAGS(*out_name_sv) & SVpad_OUR)) { | |
714 | *out_capture = Nullsv; | |
715 | return offset; | |
716 | } | |
ee6cee0c | 717 | |
b5c19bd7 DM |
718 | /* trying to capture from an anon prototype? */ |
719 | if (CvCOMPILED(cv) | |
720 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) | |
721 | : *out_flags & PAD_FAKELEX_ANON) | |
722 | { | |
723 | if (warn && ckWARN(WARN_CLOSURE)) | |
724 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
725 | "Variable \"%s\" is not available", name); | |
726 | *out_capture = Nullsv; | |
727 | } | |
ee6cee0c | 728 | |
b5c19bd7 DM |
729 | /* real value */ |
730 | else { | |
731 | int newwarn = warn; | |
732 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) | |
733 | && warn && ckWARN(WARN_CLOSURE)) { | |
734 | newwarn = 0; | |
735 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
736 | "Variable \"%s\" will not stay shared", name); | |
737 | } | |
dd2155a4 | 738 | |
b5c19bd7 DM |
739 | if (fake_offset && CvANON(cv) |
740 | && CvCLONE(cv) &&!CvCLONED(cv)) | |
741 | { | |
742 | SV *n; | |
743 | /* not yet caught - look further up */ | |
744 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
745 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", | |
746 | PTR2UV(cv))); | |
747 | n = *out_name_sv; | |
748 | pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), | |
749 | newwarn, out_capture, out_name_sv, out_flags); | |
750 | *out_name_sv = n; | |
751 | return offset; | |
dd2155a4 | 752 | } |
b5c19bd7 DM |
753 | |
754 | *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ | |
755 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; | |
756 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
757 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", | |
19a5c512 | 758 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 DM |
759 | |
760 | if (SvPADSTALE(*out_capture)) { | |
761 | if (ckWARN(WARN_CLOSURE)) | |
ee6cee0c | 762 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b5c19bd7 DM |
763 | "Variable \"%s\" is not available", name); |
764 | *out_capture = Nullsv; | |
dd2155a4 DM |
765 | } |
766 | } | |
b5c19bd7 DM |
767 | if (!*out_capture) { |
768 | if (*name == '@') | |
769 | *out_capture = sv_2mortal((SV*)newAV()); | |
770 | else if (*name == '%') | |
771 | *out_capture = sv_2mortal((SV*)newHV()); | |
772 | else | |
773 | *out_capture = sv_newmortal(); | |
774 | } | |
dd2155a4 | 775 | } |
b5c19bd7 DM |
776 | |
777 | return offset; | |
ee6cee0c | 778 | } |
b5c19bd7 DM |
779 | } |
780 | ||
781 | /* it's not in this pad - try above */ | |
782 | ||
783 | if (!CvOUTSIDE(cv)) | |
784 | return NOT_IN_PAD; | |
785 | ||
786 | /* out_capture non-null means caller wants us to capture lex; in | |
71f882da | 787 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 | 788 | new_capturep = out_capture ? out_capture : |
71f882da | 789 | CvLATE(cv) ? Null(SV**) : &new_capture; |
b5c19bd7 DM |
790 | |
791 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, | |
792 | new_capturep, out_name_sv, out_flags); | |
793 | if (offset == NOT_IN_PAD) | |
794 | return NOT_IN_PAD; | |
795 | ||
796 | /* found in an outer CV. Add appropriate fake entry to this pad */ | |
797 | ||
798 | /* don't add new fake entries (via eval) to CVs that we have already | |
799 | * finished compiling, or to undef CVs */ | |
800 | if (CvCOMPILED(cv) || !padlist) | |
801 | return 0; /* this dummy (and invalid) value isnt used by the caller */ | |
802 | ||
803 | { | |
804 | SV *new_namesv; | |
805 | AV *ocomppad_name = PL_comppad_name; | |
806 | PAD *ocomppad = PL_comppad; | |
807 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; | |
808 | PL_comppad = (AV*)AvARRAY(padlist)[1]; | |
809 | PL_curpad = AvARRAY(PL_comppad); | |
810 | ||
811 | new_offset = pad_add_name( | |
812 | SvPVX(*out_name_sv), | |
813 | (SvFLAGS(*out_name_sv) & SVpad_TYPED) | |
814 | ? SvSTASH(*out_name_sv) : Nullhv, | |
815 | (SvFLAGS(*out_name_sv) & SVpad_OUR) | |
816 | ? GvSTASH(*out_name_sv) : Nullhv, | |
817 | 1 /* fake */ | |
818 | ); | |
819 | ||
820 | new_namesv = AvARRAY(PL_comppad_name)[new_offset]; | |
821 | SvIVX(new_namesv) = *out_flags; | |
822 | ||
823 | SvNVX(new_namesv) = (NV)0; | |
824 | if (SvFLAGS(new_namesv) & SVpad_OUR) { | |
825 | /* do nothing */ | |
826 | } | |
71f882da | 827 | else if (CvLATE(cv)) { |
b5c19bd7 DM |
828 | /* delayed creation - just note the offset within parent pad */ |
829 | SvNVX(new_namesv) = (NV)offset; | |
830 | CvCLONE_on(cv); | |
831 | } | |
832 | else { | |
833 | /* immediate creation - capture outer value right now */ | |
834 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); | |
835 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
836 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", | |
837 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); | |
dd2155a4 | 838 | } |
b5c19bd7 DM |
839 | *out_name_sv = new_namesv; |
840 | *out_flags = SvIVX(new_namesv); | |
841 | ||
842 | PL_comppad_name = ocomppad_name; | |
843 | PL_comppad = ocomppad; | |
844 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **); | |
dd2155a4 | 845 | } |
b5c19bd7 | 846 | return new_offset; |
dd2155a4 DM |
847 | } |
848 | ||
b5c19bd7 | 849 | |
dd2155a4 DM |
850 | /* |
851 | =for apidoc pad_sv | |
852 | ||
853 | Get the value at offset po in the current pad. | |
854 | Use macro PAD_SV instead of calling this function directly. | |
855 | ||
856 | =cut | |
857 | */ | |
858 | ||
859 | ||
860 | SV * | |
861 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
862 | { | |
f3548bdc | 863 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 | 864 | |
dd2155a4 DM |
865 | if (!po) |
866 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
867 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
868 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 869 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 DM |
870 | ); |
871 | return PL_curpad[po]; | |
872 | } | |
873 | ||
874 | ||
875 | /* | |
876 | =for apidoc pad_setsv | |
877 | ||
878 | Set the entry at offset po in the current pad to sv. | |
879 | Use the macro PAD_SETSV() rather than calling this function directly. | |
880 | ||
881 | =cut | |
882 | */ | |
883 | ||
884 | #ifdef DEBUGGING | |
885 | void | |
886 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
887 | { | |
f3548bdc | 888 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 DM |
889 | |
890 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
891 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 892 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 DM |
893 | ); |
894 | PL_curpad[po] = sv; | |
895 | } | |
896 | #endif | |
897 | ||
898 | ||
899 | ||
900 | /* | |
901 | =for apidoc pad_block_start | |
902 | ||
903 | Update the pad compilation state variables on entry to a new block | |
904 | ||
905 | =cut | |
906 | */ | |
907 | ||
908 | /* XXX DAPM perhaps: | |
909 | * - integrate this in general state-saving routine ??? | |
910 | * - combine with the state-saving going on in pad_new ??? | |
911 | * - introduce a new SAVE type that does all this in one go ? | |
912 | */ | |
913 | ||
914 | void | |
915 | Perl_pad_block_start(pTHX_ int full) | |
916 | { | |
f3548bdc | 917 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 DM |
918 | SAVEI32(PL_comppad_name_floor); |
919 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
920 | if (full) | |
921 | PL_comppad_name_fill = PL_comppad_name_floor; | |
922 | if (PL_comppad_name_floor < 0) | |
923 | PL_comppad_name_floor = 0; | |
924 | SAVEI32(PL_min_intro_pending); | |
925 | SAVEI32(PL_max_intro_pending); | |
926 | PL_min_intro_pending = 0; | |
927 | SAVEI32(PL_comppad_name_fill); | |
928 | SAVEI32(PL_padix_floor); | |
929 | PL_padix_floor = PL_padix; | |
930 | PL_pad_reset_pending = FALSE; | |
931 | } | |
932 | ||
933 | ||
934 | /* | |
935 | =for apidoc intro_my | |
936 | ||
937 | "Introduce" my variables to visible status. | |
938 | ||
939 | =cut | |
940 | */ | |
941 | ||
942 | U32 | |
943 | Perl_intro_my(pTHX) | |
944 | { | |
945 | SV **svp; | |
946 | SV *sv; | |
947 | I32 i; | |
948 | ||
f3548bdc | 949 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 DM |
950 | if (! PL_min_intro_pending) |
951 | return PL_cop_seqmax; | |
952 | ||
953 | svp = AvARRAY(PL_comppad_name); | |
954 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
ee6cee0c DM |
955 | if ((sv = svp[i]) && sv != &PL_sv_undef |
956 | && !SvFAKE(sv) && !SvIVX(sv)) | |
957 | { | |
dd2155a4 DM |
958 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ |
959 | SvNVX(sv) = (NV)PL_cop_seqmax; | |
960 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 961 | "Pad intromy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 | 962 | (long)i, SvPVX(sv), |
4cf4a199 | 963 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 DM |
964 | ); |
965 | } | |
966 | } | |
967 | PL_min_intro_pending = 0; | |
968 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
969 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
970 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
971 | ||
972 | return PL_cop_seqmax++; | |
973 | } | |
974 | ||
975 | /* | |
976 | =for apidoc pad_leavemy | |
977 | ||
978 | Cleanup at end of scope during compilation: set the max seq number for | |
979 | lexicals in this scope and warn of any lexicals that never got introduced. | |
980 | ||
981 | =cut | |
982 | */ | |
983 | ||
984 | void | |
985 | Perl_pad_leavemy(pTHX) | |
986 | { | |
987 | I32 off; | |
988 | SV **svp = AvARRAY(PL_comppad_name); | |
989 | SV *sv; | |
990 | ||
991 | PL_pad_reset_pending = FALSE; | |
992 | ||
f3548bdc | 993 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 DM |
994 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
995 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
ee6cee0c DM |
996 | if ((sv = svp[off]) && sv != &PL_sv_undef |
997 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) | |
dd2155a4 | 998 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
35c1215d | 999 | "%"SVf" never introduced", sv); |
dd2155a4 DM |
1000 | } |
1001 | } | |
1002 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
1003 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
ee6cee0c DM |
1004 | if ((sv = svp[off]) && sv != &PL_sv_undef |
1005 | && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) | |
1006 | { | |
dd2155a4 DM |
1007 | SvIVX(sv) = PL_cop_seqmax; |
1008 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 1009 | "Pad leavemy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 | 1010 | (long)off, SvPVX(sv), |
4cf4a199 | 1011 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 DM |
1012 | ); |
1013 | } | |
1014 | } | |
1015 | PL_cop_seqmax++; | |
1016 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1017 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
1018 | } | |
1019 | ||
1020 | ||
1021 | /* | |
1022 | =for apidoc pad_swipe | |
1023 | ||
1024 | Abandon the tmp in the current pad at offset po and replace with a | |
1025 | new one. | |
1026 | ||
1027 | =cut | |
1028 | */ | |
1029 | ||
1030 | void | |
1031 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
1032 | { | |
f3548bdc | 1033 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 DM |
1034 | if (!PL_curpad) |
1035 | return; | |
1036 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1037 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
1038 | if (!po) | |
1039 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
1040 | ||
1041 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1042 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
1043 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
1044 | ||
1045 | if (PL_curpad[po]) | |
1046 | SvPADTMP_off(PL_curpad[po]); | |
1047 | if (refadjust) | |
1048 | SvREFCNT_dec(PL_curpad[po]); | |
1049 | ||
1050 | PL_curpad[po] = NEWSV(1107,0); | |
1051 | SvPADTMP_on(PL_curpad[po]); | |
1052 | if ((I32)po < PL_padix) | |
1053 | PL_padix = po - 1; | |
1054 | } | |
1055 | ||
1056 | ||
1057 | /* | |
1058 | =for apidoc pad_reset | |
1059 | ||
1060 | Mark all the current temporaries for reuse | |
1061 | ||
1062 | =cut | |
1063 | */ | |
1064 | ||
1065 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
1066 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
1067 | * on the stack by OPs that use them, there are several ways to get an alias | |
1068 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
1069 | * We avoid doing this until we can think of a Better Way. | |
1070 | * GSAR 97-10-29 */ | |
1071 | void | |
1072 | Perl_pad_reset(pTHX) | |
1073 | { | |
1074 | #ifdef USE_BROKEN_PAD_RESET | |
1075 | register I32 po; | |
1076 | ||
1077 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1078 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
1079 | ||
1080 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1081 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
1082 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1083 | (long)PL_padix, (long)PL_padix_floor | |
1084 | ) | |
1085 | ); | |
1086 | ||
1087 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
1088 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { | |
1089 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1090 | SvPADTMP_off(PL_curpad[po]); | |
1091 | } | |
1092 | PL_padix = PL_padix_floor; | |
1093 | } | |
1094 | #endif | |
1095 | PL_pad_reset_pending = FALSE; | |
1096 | } | |
1097 | ||
1098 | ||
1099 | /* | |
1100 | =for apidoc pad_tidy | |
1101 | ||
1102 | Tidy up a pad after we've finished compiling it: | |
1103 | * remove most stuff from the pads of anonsub prototypes; | |
1104 | * give it a @_; | |
1105 | * mark tmps as such. | |
1106 | ||
1107 | =cut | |
1108 | */ | |
1109 | ||
1110 | /* XXX DAPM surely most of this stuff should be done properly | |
1111 | * at the right time beforehand, rather than going around afterwards | |
1112 | * cleaning up our mistakes ??? | |
1113 | */ | |
1114 | ||
1115 | void | |
1116 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1117 | { | |
1118 | PADOFFSET ix; | |
b5c19bd7 | 1119 | CV *cv; |
dd2155a4 | 1120 | |
f3548bdc | 1121 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 DM |
1122 | |
1123 | /* If this CV has had any 'eval-capable' ops planted in it | |
1124 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any | |
1125 | * anon prototypes in the chain of CVs should be marked as cloneable, | |
1126 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets | |
1127 | * the right CvOUTSIDE. | |
1128 | * If running with -d, *any* sub may potentially have an eval | |
1129 | * excuted within it. | |
1130 | */ | |
1131 | ||
1132 | if (PL_cv_has_eval || PL_perldb) { | |
1133 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { | |
1134 | if (cv != PL_compcv && CvCOMPILED(cv)) | |
1135 | break; /* no need to mark already-compiled code */ | |
1136 | if (CvANON(cv)) { | |
1137 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1138 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); | |
1139 | CvCLONE_on(cv); | |
1140 | } | |
1141 | } | |
1142 | } | |
1143 | ||
dd2155a4 DM |
1144 | /* extend curpad to match namepad */ |
1145 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
1146 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); | |
1147 | ||
1148 | if (type == padtidy_SUBCLONE) { | |
1149 | SV **namep = AvARRAY(PL_comppad_name); | |
b5c19bd7 | 1150 | |
dd2155a4 DM |
1151 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1152 | SV *namesv; | |
1153 | ||
1154 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1155 | continue; | |
1156 | /* | |
1157 | * The only things that a clonable function needs in its | |
b5c19bd7 | 1158 | * pad are anonymous subs. |
dd2155a4 DM |
1159 | * The rest are created anew during cloning. |
1160 | */ | |
1161 | if (!((namesv = namep[ix]) != Nullsv && | |
1162 | namesv != &PL_sv_undef && | |
b5c19bd7 | 1163 | *SvPVX(namesv) == '&')) |
dd2155a4 DM |
1164 | { |
1165 | SvREFCNT_dec(PL_curpad[ix]); | |
1166 | PL_curpad[ix] = Nullsv; | |
1167 | } | |
1168 | } | |
1169 | } | |
1170 | else if (type == padtidy_SUB) { | |
1171 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
1172 | AV *av = newAV(); /* Will be @_ */ | |
1173 | av_extend(av, 0); | |
1174 | av_store(PL_comppad, 0, (SV*)av); | |
1175 | AvFLAGS(av) = AVf_REIFY; | |
1176 | } | |
1177 | ||
1178 | /* XXX DAPM rationalise these two similar branches */ | |
1179 | ||
1180 | if (type == padtidy_SUB) { | |
1181 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1182 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1183 | continue; | |
1184 | if (!SvPADMY(PL_curpad[ix])) | |
1185 | SvPADTMP_on(PL_curpad[ix]); | |
1186 | } | |
1187 | } | |
1188 | else if (type == padtidy_FORMAT) { | |
1189 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1190 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) | |
1191 | SvPADTMP_on(PL_curpad[ix]); | |
1192 | } | |
1193 | } | |
f3548bdc | 1194 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 DM |
1195 | } |
1196 | ||
1197 | ||
1198 | /* | |
1199 | =for apidoc pad_free | |
1200 | ||
1201 | Free the SV at offet po in the current pad. | |
1202 | ||
1203 | =cut | |
1204 | */ | |
1205 | ||
1206 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1207 | void | |
1208 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1209 | { | |
f3548bdc | 1210 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 DM |
1211 | if (!PL_curpad) |
1212 | return; | |
1213 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1214 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1215 | if (!po) | |
1216 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1217 | ||
1218 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1219 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1220 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1221 | ); | |
1222 | ||
1223 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1224 | SvPADTMP_off(PL_curpad[po]); | |
1225 | #ifdef USE_ITHREADS | |
7e736055 HS |
1226 | /* SV could be a shared hash key (eg bugid #19022) */ |
1227 | if ( | |
dd2155a4 | 1228 | #ifdef PERL_COPY_ON_WRITE |
7e736055 HS |
1229 | !SvIsCOW(PL_curpad[po]) |
1230 | #else | |
1231 | !SvFAKE(PL_curpad[po]) | |
dd2155a4 | 1232 | #endif |
7e736055 | 1233 | ) |
dd2155a4 | 1234 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 DM |
1235 | #endif |
1236 | } | |
1237 | if ((I32)po < PL_padix) | |
1238 | PL_padix = po - 1; | |
1239 | } | |
1240 | ||
1241 | ||
1242 | ||
1243 | /* | |
1244 | =for apidoc do_dump_pad | |
1245 | ||
1246 | Dump the contents of a padlist | |
1247 | ||
1248 | =cut | |
1249 | */ | |
1250 | ||
1251 | void | |
1252 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1253 | { | |
1254 | AV *pad_name; | |
1255 | AV *pad; | |
1256 | SV **pname; | |
1257 | SV **ppad; | |
1258 | SV *namesv; | |
1259 | I32 ix; | |
1260 | ||
1261 | if (!padlist) { | |
1262 | return; | |
1263 | } | |
1264 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); | |
1265 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); | |
1266 | pname = AvARRAY(pad_name); | |
1267 | ppad = AvARRAY(pad); | |
1268 | Perl_dump_indent(aTHX_ level, file, | |
1269 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1270 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1271 | ); | |
1272 | ||
1273 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
1274 | namesv = pname[ix]; | |
1275 | if (namesv && namesv == &PL_sv_undef) { | |
1276 | namesv = Nullsv; | |
1277 | } | |
1278 | if (namesv) { | |
ee6cee0c DM |
1279 | if (SvFAKE(namesv)) |
1280 | Perl_dump_indent(aTHX_ level+1, file, | |
c0fd1b42 | 1281 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c DM |
1282 | (int) ix, |
1283 | PTR2UV(ppad[ix]), | |
1284 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
b5c19bd7 DM |
1285 | SvPVX(namesv), |
1286 | (unsigned long)SvIVX(namesv), | |
1287 | (unsigned long)SvNVX(namesv) | |
1288 | ||
ee6cee0c DM |
1289 | ); |
1290 | else | |
1291 | Perl_dump_indent(aTHX_ level+1, file, | |
b5c19bd7 | 1292 | "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n", |
ee6cee0c DM |
1293 | (int) ix, |
1294 | PTR2UV(ppad[ix]), | |
1295 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
4cf4a199 | 1296 | (long)U_32(SvNVX(namesv)), |
b5c19bd7 | 1297 | (long)SvIVX(namesv), |
e9d09c08 | 1298 | SvPVX(namesv) |
ee6cee0c | 1299 | ); |
dd2155a4 DM |
1300 | } |
1301 | else if (full) { | |
1302 | Perl_dump_indent(aTHX_ level+1, file, | |
1303 | "%2d. 0x%"UVxf"<%lu>\n", | |
1304 | (int) ix, | |
1305 | PTR2UV(ppad[ix]), | |
1306 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1307 | ); | |
1308 | } | |
1309 | } | |
1310 | } | |
1311 | ||
1312 | ||
1313 | ||
1314 | /* | |
1315 | =for apidoc cv_dump | |
1316 | ||
1317 | dump the contents of a CV | |
1318 | ||
1319 | =cut | |
1320 | */ | |
1321 | ||
1322 | #ifdef DEBUGGING | |
1323 | STATIC void | |
1324 | S_cv_dump(pTHX_ CV *cv, char *title) | |
1325 | { | |
1326 | CV *outside = CvOUTSIDE(cv); | |
1327 | AV* padlist = CvPADLIST(cv); | |
1328 | ||
1329 | PerlIO_printf(Perl_debug_log, | |
1330 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1331 | title, | |
1332 | PTR2UV(cv), | |
1333 | (CvANON(cv) ? "ANON" | |
71f882da | 1334 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 DM |
1335 | : (cv == PL_main_cv) ? "MAIN" |
1336 | : CvUNIQUE(cv) ? "UNIQUE" | |
1337 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1338 | PTR2UV(outside), | |
1339 | (!outside ? "null" | |
1340 | : CvANON(outside) ? "ANON" | |
1341 | : (outside == PL_main_cv) ? "MAIN" | |
1342 | : CvUNIQUE(outside) ? "UNIQUE" | |
1343 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1344 | ||
1345 | PerlIO_printf(Perl_debug_log, | |
1346 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1347 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1348 | } | |
1349 | #endif /* DEBUGGING */ | |
1350 | ||
1351 | ||
1352 | ||
1353 | ||
1354 | ||
1355 | /* | |
1356 | =for apidoc cv_clone | |
1357 | ||
1358 | Clone a CV: make a new CV which points to the same code etc, but which | |
1359 | has a newly-created pad built by copying the prototype pad and capturing | |
1360 | any outer lexicals. | |
1361 | ||
1362 | =cut | |
1363 | */ | |
1364 | ||
1365 | CV * | |
1366 | Perl_cv_clone(pTHX_ CV *proto) | |
1367 | { | |
dd2155a4 DM |
1368 | I32 ix; |
1369 | AV* protopadlist = CvPADLIST(proto); | |
1370 | AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); | |
1371 | AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); | |
1372 | SV** pname = AvARRAY(protopad_name); | |
1373 | SV** ppad = AvARRAY(protopad); | |
1374 | I32 fname = AvFILLp(protopad_name); | |
1375 | I32 fpad = AvFILLp(protopad); | |
1376 | AV* comppadlist; | |
1377 | CV* cv; | |
b5c19bd7 DM |
1378 | SV** outpad; |
1379 | CV* outside; | |
71f882da | 1380 | long depth; |
dd2155a4 DM |
1381 | |
1382 | assert(!CvUNIQUE(proto)); | |
1383 | ||
71f882da DM |
1384 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1385 | * to a prototype; we instead want the cloned parent who called us. | |
1386 | * Note that in general for formats, CvOUTSIDE != find_runcv */ | |
1387 | ||
1388 | outside = CvOUTSIDE(proto); | |
1389 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) | |
1390 | outside = find_runcv(NULL); | |
1391 | depth = CvDEPTH(outside); | |
1392 | assert(depth || SvTYPE(proto) == SVt_PVFM); | |
1393 | if (!depth) | |
1394 | depth = 1; | |
b5c19bd7 DM |
1395 | assert(CvPADLIST(outside)); |
1396 | ||
dd2155a4 DM |
1397 | ENTER; |
1398 | SAVESPTR(PL_compcv); | |
1399 | ||
1400 | cv = PL_compcv = (CV*)NEWSV(1104, 0); | |
1401 | sv_upgrade((SV *)cv, SvTYPE(proto)); | |
7dafbf52 | 1402 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 DM |
1403 | CvCLONED_on(cv); |
1404 | ||
dd2155a4 DM |
1405 | #ifdef USE_ITHREADS |
1406 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) | |
1407 | : savepv(CvFILE(proto)); | |
1408 | #else | |
1409 | CvFILE(cv) = CvFILE(proto); | |
1410 | #endif | |
1411 | CvGV(cv) = CvGV(proto); | |
1412 | CvSTASH(cv) = CvSTASH(proto); | |
b34c0dd4 | 1413 | OP_REFCNT_LOCK; |
dd2155a4 | 1414 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
b34c0dd4 | 1415 | OP_REFCNT_UNLOCK; |
dd2155a4 | 1416 | CvSTART(cv) = CvSTART(proto); |
b5c19bd7 DM |
1417 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
1418 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); | |
dd2155a4 DM |
1419 | |
1420 | if (SvPOK(proto)) | |
1421 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); | |
1422 | ||
1423 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); | |
1424 | ||
b5c19bd7 | 1425 | av_fill(PL_comppad, fpad); |
dd2155a4 DM |
1426 | for (ix = fname; ix >= 0; ix--) |
1427 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1428 | ||
dd2155a4 DM |
1429 | PL_curpad = AvARRAY(PL_comppad); |
1430 | ||
71f882da | 1431 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 | 1432 | |
dd2155a4 DM |
1433 | for (ix = fpad; ix > 0; ix--) { |
1434 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; | |
71f882da DM |
1435 | SV *sv = Nullsv; |
1436 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ | |
b5c19bd7 | 1437 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
71f882da DM |
1438 | sv = outpad[(I32)SvNVX(namesv)]; |
1439 | assert(sv); | |
1440 | /* formats may have an inactive parent */ | |
1441 | if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { | |
1442 | if (ckWARN(WARN_CLOSURE)) | |
1443 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
1444 | "Variable \"%s\" is not available", SvPVX(namesv)); | |
1445 | sv = Nullsv; | |
1446 | } | |
1447 | else { | |
1448 | assert(!SvPADSTALE(sv)); | |
1449 | sv = SvREFCNT_inc(sv); | |
1450 | } | |
dd2155a4 | 1451 | } |
71f882da | 1452 | if (!sv) { |
b5c19bd7 DM |
1453 | char *name = SvPVX(namesv); |
1454 | if (*name == '&') | |
dd2155a4 | 1455 | sv = SvREFCNT_inc(ppad[ix]); |
dd2155a4 DM |
1456 | else if (*name == '@') |
1457 | sv = (SV*)newAV(); | |
1458 | else if (*name == '%') | |
1459 | sv = (SV*)newHV(); | |
1460 | else | |
1461 | sv = NEWSV(0, 0); | |
235cc2e3 | 1462 | SvPADMY_on(sv); |
dd2155a4 DM |
1463 | } |
1464 | } | |
1465 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
71f882da | 1466 | sv = SvREFCNT_inc(ppad[ix]); |
dd2155a4 DM |
1467 | } |
1468 | else { | |
b5c19bd7 | 1469 | sv = NEWSV(0, 0); |
dd2155a4 | 1470 | SvPADTMP_on(sv); |
dd2155a4 | 1471 | } |
71f882da | 1472 | PL_curpad[ix] = sv; |
dd2155a4 DM |
1473 | } |
1474 | ||
dd2155a4 DM |
1475 | DEBUG_Xv( |
1476 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1477 | cv_dump(outside, "Outside"); | |
1478 | cv_dump(proto, "Proto"); | |
1479 | cv_dump(cv, "To"); | |
1480 | ); | |
1481 | ||
1482 | LEAVE; | |
1483 | ||
1484 | if (CvCONST(cv)) { | |
b5c19bd7 DM |
1485 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1486 | * The prototype was marked as a candiate for const-ization, | |
1487 | * so try to grab the current const value, and if successful, | |
1488 | * turn into a const sub: | |
1489 | */ | |
dd2155a4 | 1490 | SV* const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 DM |
1491 | if (const_sv) { |
1492 | SvREFCNT_dec(cv); | |
1493 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); | |
1494 | } | |
1495 | else { | |
1496 | CvCONST_off(cv); | |
1497 | } | |
dd2155a4 DM |
1498 | } |
1499 | ||
1500 | return cv; | |
1501 | } | |
1502 | ||
1503 | ||
1504 | /* | |
1505 | =for apidoc pad_fixup_inner_anons | |
1506 | ||
1507 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
7dafbf52 DM |
1508 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1509 | moved to a pre-existing CV struct. | |
dd2155a4 DM |
1510 | |
1511 | =cut | |
1512 | */ | |
1513 | ||
1514 | void | |
1515 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1516 | { | |
1517 | I32 ix; | |
1518 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; | |
1519 | AV *comppad = (AV*)AvARRAY(padlist)[1]; | |
1520 | SV **namepad = AvARRAY(comppad_name); | |
1521 | SV **curpad = AvARRAY(comppad); | |
1522 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { | |
1523 | SV *namesv = namepad[ix]; | |
1524 | if (namesv && namesv != &PL_sv_undef | |
1525 | && *SvPVX(namesv) == '&') | |
1526 | { | |
1527 | CV *innercv = (CV*)curpad[ix]; | |
7dafbf52 DM |
1528 | assert(CvWEAKOUTSIDE(innercv)); |
1529 | assert(CvOUTSIDE(innercv) == old_cv); | |
1530 | CvOUTSIDE(innercv) = new_cv; | |
dd2155a4 DM |
1531 | } |
1532 | } | |
1533 | } | |
1534 | ||
7dafbf52 | 1535 | |
dd2155a4 DM |
1536 | /* |
1537 | =for apidoc pad_push | |
1538 | ||
1539 | Push a new pad frame onto the padlist, unless there's already a pad at | |
1540 | this depth, in which case don't bother creating a new one. | |
1541 | If has_args is true, give the new pad an @_ in slot zero. | |
1542 | ||
1543 | =cut | |
1544 | */ | |
1545 | ||
ff0adf16 DM |
1546 | /* XXX pad_push is now always called with has_args == 1. Get rid of |
1547 | * this arg at some point */ | |
1548 | ||
dd2155a4 DM |
1549 | void |
1550 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) | |
1551 | { | |
1552 | if (depth <= AvFILLp(padlist)) | |
1553 | return; | |
1554 | ||
1555 | { | |
1556 | SV** svp = AvARRAY(padlist); | |
1557 | AV *newpad = newAV(); | |
1558 | SV **oldpad = AvARRAY(svp[depth-1]); | |
1559 | I32 ix = AvFILLp((AV*)svp[1]); | |
1560 | I32 names_fill = AvFILLp((AV*)svp[0]); | |
1561 | SV** names = AvARRAY(svp[0]); | |
1562 | SV* sv; | |
1563 | for ( ;ix > 0; ix--) { | |
1564 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
1565 | char *name = SvPVX(names[ix]); | |
1566 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || *name == '&') { | |
1567 | /* outer lexical or anon code */ | |
1568 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1569 | } | |
1570 | else { /* our own lexical */ | |
1571 | if (*name == '@') | |
1572 | av_store(newpad, ix, sv = (SV*)newAV()); | |
1573 | else if (*name == '%') | |
1574 | av_store(newpad, ix, sv = (SV*)newHV()); | |
1575 | else | |
1576 | av_store(newpad, ix, sv = NEWSV(0, 0)); | |
1577 | SvPADMY_on(sv); | |
1578 | } | |
1579 | } | |
1580 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
1581 | av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix])); | |
1582 | } | |
1583 | else { | |
1584 | /* save temporaries on recursion? */ | |
1585 | av_store(newpad, ix, sv = NEWSV(0, 0)); | |
1586 | SvPADTMP_on(sv); | |
1587 | } | |
1588 | } | |
1589 | if (has_args) { | |
1590 | AV* av = newAV(); | |
1591 | av_extend(av, 0); | |
1592 | av_store(newpad, 0, (SV*)av); | |
1593 | AvFLAGS(av) = AVf_REIFY; | |
1594 | } | |
1595 | av_store(padlist, depth, (SV*)newpad); | |
1596 | AvFILLp(padlist) = depth; | |
1597 | } | |
1598 | } |