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dd2155a4 DM |
1 | /* pad.c |
2 | * | |
1d325971 | 3 | * Copyright (C) 2002, 2003, 2004, 2005 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 | 134 | { |
e1ec3a88 | 135 | AV *padlist, *padname, *pad; |
dd2155a4 | 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 | ||
e1ec3a88 | 176 | AV * const a0 = newAV(); /* will be @_ */ |
dd2155a4 DM |
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; | |
e1ec3a88 | 232 | const PADLIST *padlist = CvPADLIST(cv); |
dd2155a4 DM |
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); | |
e1ec3a88 | 252 | const 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 | 261 | { |
7fc63493 | 262 | CV * const 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; | |
7fc63493 | 279 | (void)SvREFCNT_inc(outercv); |
9d1ce744 JH |
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 | 326 | PADOFFSET |
e1ec3a88 | 327 | Perl_pad_add_name(pTHX_ const char *name, HV* typestash, HV* ourstash, bool fake) |
dd2155a4 DM |
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); | |
e1ec3a88 | 412 | const SSize_t names_fill = AvFILLp(PL_comppad_name); |
dd2155a4 DM |
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])); | |
fd0854ff DM |
437 | #ifdef DEBUG_LEAKING_SCALARS |
438 | sv->sv_debug_optype = optype; | |
439 | sv->sv_debug_inpad = 1; | |
fd0854ff | 440 | #endif |
a212c8b5 | 441 | return (PADOFFSET)retval; |
dd2155a4 DM |
442 | } |
443 | ||
444 | /* | |
445 | =for apidoc pad_add_anon | |
446 | ||
447 | Add an anon code entry to the current compiling pad | |
448 | ||
449 | =cut | |
450 | */ | |
451 | ||
452 | PADOFFSET | |
453 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) | |
454 | { | |
455 | PADOFFSET ix; | |
456 | SV* name; | |
457 | ||
458 | name = NEWSV(1106, 0); | |
459 | sv_upgrade(name, SVt_PVNV); | |
460 | sv_setpvn(name, "&", 1); | |
461 | SvIVX(name) = -1; | |
462 | SvNVX(name) = 1; | |
463 | ix = pad_alloc(op_type, SVs_PADMY); | |
464 | av_store(PL_comppad_name, ix, name); | |
f3548bdc | 465 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 DM |
466 | av_store(PL_comppad, ix, sv); |
467 | SvPADMY_on(sv); | |
7dafbf52 DM |
468 | |
469 | /* to avoid ref loops, we never have parent + child referencing each | |
470 | * other simultaneously */ | |
471 | if (CvOUTSIDE((CV*)sv)) { | |
472 | assert(!CvWEAKOUTSIDE((CV*)sv)); | |
473 | CvWEAKOUTSIDE_on((CV*)sv); | |
474 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); | |
475 | } | |
dd2155a4 DM |
476 | return ix; |
477 | } | |
478 | ||
479 | ||
480 | ||
481 | /* | |
482 | =for apidoc pad_check_dup | |
483 | ||
484 | Check for duplicate declarations: report any of: | |
485 | * a my in the current scope with the same name; | |
486 | * an our (anywhere in the pad) with the same name and the same stash | |
487 | as C<ourstash> | |
488 | C<is_our> indicates that the name to check is an 'our' declaration | |
489 | ||
490 | =cut | |
491 | */ | |
492 | ||
493 | /* XXX DAPM integrate this into pad_add_name ??? */ | |
494 | ||
495 | void | |
e1ec3a88 | 496 | Perl_pad_check_dup(pTHX_ const char *name, bool is_our, const HV *ourstash) |
dd2155a4 DM |
497 | { |
498 | SV **svp, *sv; | |
499 | PADOFFSET top, off; | |
500 | ||
f3548bdc | 501 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
dd2155a4 DM |
502 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) |
503 | return; /* nothing to check */ | |
504 | ||
505 | svp = AvARRAY(PL_comppad_name); | |
506 | top = AvFILLp(PL_comppad_name); | |
507 | /* check the current scope */ | |
508 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same | |
509 | * type ? */ | |
510 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { | |
511 | if ((sv = svp[off]) | |
512 | && sv != &PL_sv_undef | |
ee6cee0c | 513 | && !SvFAKE(sv) |
dd2155a4 DM |
514 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
515 | && (!is_our | |
516 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) | |
517 | && strEQ(name, SvPVX(sv))) | |
518 | { | |
519 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
520 | "\"%s\" variable %s masks earlier declaration in same %s", | |
521 | (is_our ? "our" : "my"), | |
522 | name, | |
523 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); | |
524 | --off; | |
525 | break; | |
526 | } | |
527 | } | |
528 | /* check the rest of the pad */ | |
529 | if (is_our) { | |
530 | do { | |
531 | if ((sv = svp[off]) | |
532 | && sv != &PL_sv_undef | |
ee6cee0c | 533 | && !SvFAKE(sv) |
dd2155a4 DM |
534 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
535 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) | |
536 | && strEQ(name, SvPVX(sv))) | |
537 | { | |
538 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
539 | "\"our\" variable %s redeclared", name); | |
540 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
541 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
542 | break; | |
543 | } | |
544 | } while ( off-- > 0 ); | |
545 | } | |
546 | } | |
547 | ||
548 | ||
dd2155a4 DM |
549 | /* |
550 | =for apidoc pad_findmy | |
551 | ||
552 | Given a lexical name, try to find its offset, first in the current pad, | |
553 | or failing that, in the pads of any lexically enclosing subs (including | |
554 | the complications introduced by eval). If the name is found in an outer pad, | |
555 | then a fake entry is added to the current pad. | |
556 | Returns the offset in the current pad, or NOT_IN_PAD on failure. | |
557 | ||
558 | =cut | |
559 | */ | |
560 | ||
561 | PADOFFSET | |
e1ec3a88 | 562 | Perl_pad_findmy(pTHX_ const char *name) |
dd2155a4 | 563 | { |
b5c19bd7 DM |
564 | SV *out_sv; |
565 | int out_flags; | |
929a0744 | 566 | I32 offset; |
e1ec3a88 | 567 | const AV *nameav; |
929a0744 | 568 | SV **name_svp; |
dd2155a4 | 569 | |
929a0744 | 570 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
b5c19bd7 | 571 | Null(SV**), &out_sv, &out_flags); |
929a0744 DM |
572 | if (offset != NOT_IN_PAD) |
573 | return offset; | |
574 | ||
575 | /* look for an our that's being introduced; this allows | |
576 | * our $foo = 0 unless defined $foo; | |
577 | * to not give a warning. (Yes, this is a hack) */ | |
578 | ||
579 | nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; | |
580 | name_svp = AvARRAY(nameav); | |
581 | for (offset = AvFILLp(nameav); offset > 0; offset--) { | |
e1ec3a88 | 582 | const SV *namesv = name_svp[offset]; |
929a0744 DM |
583 | if (namesv && namesv != &PL_sv_undef |
584 | && !SvFAKE(namesv) | |
585 | && (SvFLAGS(namesv) & SVpad_OUR) | |
586 | && strEQ(SvPVX(namesv), name) | |
4cf4a199 | 587 | && U_32(SvNVX(namesv)) == PAD_MAX /* min */ |
929a0744 DM |
588 | ) |
589 | return offset; | |
590 | } | |
591 | return NOT_IN_PAD; | |
dd2155a4 DM |
592 | } |
593 | ||
e1f795dc RGS |
594 | /* |
595 | * Returns the offset of a lexical $_, if there is one, at run time. | |
596 | * Used by the UNDERBAR XS macro. | |
597 | */ | |
598 | ||
599 | PADOFFSET | |
29289021 | 600 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc RGS |
601 | { |
602 | SV *out_sv; | |
603 | int out_flags; | |
604 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, | |
605 | Null(SV**), &out_sv, &out_flags); | |
606 | } | |
dd2155a4 | 607 | |
dd2155a4 DM |
608 | /* |
609 | =for apidoc pad_findlex | |
610 | ||
611 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
b5c19bd7 DM |
612 | in the inner pads if it's found in an outer one. |
613 | ||
614 | Returns the offset in the bottom pad of the lex or the fake lex. | |
615 | cv is the CV in which to start the search, and seq is the current cop_seq | |
616 | to match against. If warn is true, print appropriate warnings. The out_* | |
617 | vars return values, and so are pointers to where the returned values | |
618 | should be stored. out_capture, if non-null, requests that the innermost | |
619 | instance of the lexical is captured; out_name_sv is set to the innermost | |
620 | matched namesv or fake namesv; out_flags returns the flags normally | |
621 | associated with the IVX field of a fake namesv. | |
622 | ||
623 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, | |
624 | then comes back down, adding fake entries as it goes. It has to be this way | |
625 | because fake namesvs in anon protoypes have to store in NVX the index into | |
626 | the parent pad. | |
dd2155a4 DM |
627 | |
628 | =cut | |
629 | */ | |
630 | ||
b5c19bd7 DM |
631 | /* Flags set in the SvIVX field of FAKE namesvs */ |
632 | ||
633 | #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */ | |
634 | #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */ | |
635 | ||
636 | /* the CV has finished being compiled. This is not a sufficient test for | |
637 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ | |
638 | #define CvCOMPILED(cv) CvROOT(cv) | |
639 | ||
71f882da DM |
640 | /* the CV does late binding of its lexicals */ |
641 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) | |
642 | ||
b5c19bd7 | 643 | |
dd2155a4 | 644 | STATIC PADOFFSET |
e1ec3a88 | 645 | S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn, |
b5c19bd7 | 646 | SV** out_capture, SV** out_name_sv, int *out_flags) |
dd2155a4 | 647 | { |
b5c19bd7 DM |
648 | I32 offset, new_offset; |
649 | SV *new_capture; | |
650 | SV **new_capturep; | |
e1ec3a88 | 651 | const AV *padlist = CvPADLIST(cv); |
dd2155a4 | 652 | |
b5c19bd7 | 653 | *out_flags = 0; |
a3985cdc | 654 | |
b5c19bd7 DM |
655 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
656 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", | |
657 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); | |
dd2155a4 | 658 | |
b5c19bd7 | 659 | /* first, search this pad */ |
dd2155a4 | 660 | |
b5c19bd7 DM |
661 | if (padlist) { /* not an undef CV */ |
662 | I32 fake_offset = 0; | |
e1ec3a88 | 663 | const AV *nameav = (AV*)AvARRAY(padlist)[0]; |
b5c19bd7 | 664 | SV **name_svp = AvARRAY(nameav); |
ee6cee0c | 665 | |
b5c19bd7 | 666 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
e1ec3a88 | 667 | const SV *namesv = name_svp[offset]; |
b5c19bd7 DM |
668 | if (namesv && namesv != &PL_sv_undef |
669 | && strEQ(SvPVX(namesv), name)) | |
670 | { | |
671 | if (SvFAKE(namesv)) | |
672 | fake_offset = offset; /* in case we don't find a real one */ | |
4cf4a199 JH |
673 | else if ( seq > U_32(SvNVX(namesv)) /* min */ |
674 | && seq <= (U32)SvIVX(namesv)) /* max */ | |
b5c19bd7 | 675 | break; |
ee6cee0c DM |
676 | } |
677 | } | |
678 | ||
b5c19bd7 DM |
679 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
680 | if (offset > 0) { /* not fake */ | |
681 | fake_offset = 0; | |
682 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
683 | ||
684 | /* set PAD_FAKELEX_MULTI if this lex can have multiple | |
685 | * instances. For now, we just test !CvUNIQUE(cv), but | |
686 | * ideally, we should detect my's declared within loops | |
687 | * etc - this would allow a wider range of 'not stayed | |
688 | * shared' warnings. We also treated alreadly-compiled | |
689 | * lexes as not multi as viewed from evals. */ | |
690 | ||
691 | *out_flags = CvANON(cv) ? | |
692 | PAD_FAKELEX_ANON : | |
693 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) | |
694 | ? PAD_FAKELEX_MULTI : 0; | |
695 | ||
696 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
697 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n", | |
4cf4a199 | 698 | PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)), |
b5c19bd7 DM |
699 | (long)SvIVX(*out_name_sv))); |
700 | } | |
701 | else { /* fake match */ | |
702 | offset = fake_offset; | |
703 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
704 | *out_flags = SvIVX(*out_name_sv); | |
705 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
19a5c512 | 706 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 DM |
707 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
708 | (unsigned long)SvNVX(*out_name_sv) | |
709 | )); | |
710 | } | |
dd2155a4 | 711 | |
b5c19bd7 | 712 | /* return the lex? */ |
dd2155a4 | 713 | |
b5c19bd7 | 714 | if (out_capture) { |
dd2155a4 | 715 | |
b5c19bd7 DM |
716 | /* our ? */ |
717 | if ((SvFLAGS(*out_name_sv) & SVpad_OUR)) { | |
718 | *out_capture = Nullsv; | |
719 | return offset; | |
720 | } | |
ee6cee0c | 721 | |
b5c19bd7 DM |
722 | /* trying to capture from an anon prototype? */ |
723 | if (CvCOMPILED(cv) | |
724 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) | |
725 | : *out_flags & PAD_FAKELEX_ANON) | |
726 | { | |
727 | if (warn && ckWARN(WARN_CLOSURE)) | |
728 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
729 | "Variable \"%s\" is not available", name); | |
730 | *out_capture = Nullsv; | |
731 | } | |
ee6cee0c | 732 | |
b5c19bd7 DM |
733 | /* real value */ |
734 | else { | |
735 | int newwarn = warn; | |
736 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) | |
737 | && warn && ckWARN(WARN_CLOSURE)) { | |
738 | newwarn = 0; | |
739 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
740 | "Variable \"%s\" will not stay shared", name); | |
741 | } | |
dd2155a4 | 742 | |
b5c19bd7 DM |
743 | if (fake_offset && CvANON(cv) |
744 | && CvCLONE(cv) &&!CvCLONED(cv)) | |
745 | { | |
746 | SV *n; | |
747 | /* not yet caught - look further up */ | |
748 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
749 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", | |
750 | PTR2UV(cv))); | |
751 | n = *out_name_sv; | |
752 | pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), | |
753 | newwarn, out_capture, out_name_sv, out_flags); | |
754 | *out_name_sv = n; | |
755 | return offset; | |
dd2155a4 | 756 | } |
b5c19bd7 DM |
757 | |
758 | *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ | |
759 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; | |
760 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
761 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", | |
19a5c512 | 762 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 DM |
763 | |
764 | if (SvPADSTALE(*out_capture)) { | |
765 | if (ckWARN(WARN_CLOSURE)) | |
ee6cee0c | 766 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b5c19bd7 DM |
767 | "Variable \"%s\" is not available", name); |
768 | *out_capture = Nullsv; | |
dd2155a4 DM |
769 | } |
770 | } | |
b5c19bd7 DM |
771 | if (!*out_capture) { |
772 | if (*name == '@') | |
773 | *out_capture = sv_2mortal((SV*)newAV()); | |
774 | else if (*name == '%') | |
775 | *out_capture = sv_2mortal((SV*)newHV()); | |
776 | else | |
777 | *out_capture = sv_newmortal(); | |
778 | } | |
dd2155a4 | 779 | } |
b5c19bd7 DM |
780 | |
781 | return offset; | |
ee6cee0c | 782 | } |
b5c19bd7 DM |
783 | } |
784 | ||
785 | /* it's not in this pad - try above */ | |
786 | ||
787 | if (!CvOUTSIDE(cv)) | |
788 | return NOT_IN_PAD; | |
789 | ||
790 | /* out_capture non-null means caller wants us to capture lex; in | |
71f882da | 791 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 | 792 | new_capturep = out_capture ? out_capture : |
71f882da | 793 | CvLATE(cv) ? Null(SV**) : &new_capture; |
b5c19bd7 DM |
794 | |
795 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, | |
796 | new_capturep, out_name_sv, out_flags); | |
797 | if (offset == NOT_IN_PAD) | |
798 | return NOT_IN_PAD; | |
799 | ||
800 | /* found in an outer CV. Add appropriate fake entry to this pad */ | |
801 | ||
802 | /* don't add new fake entries (via eval) to CVs that we have already | |
803 | * finished compiling, or to undef CVs */ | |
804 | if (CvCOMPILED(cv) || !padlist) | |
805 | return 0; /* this dummy (and invalid) value isnt used by the caller */ | |
806 | ||
807 | { | |
808 | SV *new_namesv; | |
809 | AV *ocomppad_name = PL_comppad_name; | |
810 | PAD *ocomppad = PL_comppad; | |
811 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; | |
812 | PL_comppad = (AV*)AvARRAY(padlist)[1]; | |
813 | PL_curpad = AvARRAY(PL_comppad); | |
814 | ||
815 | new_offset = pad_add_name( | |
816 | SvPVX(*out_name_sv), | |
817 | (SvFLAGS(*out_name_sv) & SVpad_TYPED) | |
818 | ? SvSTASH(*out_name_sv) : Nullhv, | |
819 | (SvFLAGS(*out_name_sv) & SVpad_OUR) | |
820 | ? GvSTASH(*out_name_sv) : Nullhv, | |
821 | 1 /* fake */ | |
822 | ); | |
823 | ||
824 | new_namesv = AvARRAY(PL_comppad_name)[new_offset]; | |
825 | SvIVX(new_namesv) = *out_flags; | |
826 | ||
827 | SvNVX(new_namesv) = (NV)0; | |
828 | if (SvFLAGS(new_namesv) & SVpad_OUR) { | |
829 | /* do nothing */ | |
830 | } | |
71f882da | 831 | else if (CvLATE(cv)) { |
b5c19bd7 DM |
832 | /* delayed creation - just note the offset within parent pad */ |
833 | SvNVX(new_namesv) = (NV)offset; | |
834 | CvCLONE_on(cv); | |
835 | } | |
836 | else { | |
837 | /* immediate creation - capture outer value right now */ | |
838 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); | |
839 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
840 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", | |
841 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); | |
dd2155a4 | 842 | } |
b5c19bd7 DM |
843 | *out_name_sv = new_namesv; |
844 | *out_flags = SvIVX(new_namesv); | |
845 | ||
846 | PL_comppad_name = ocomppad_name; | |
847 | PL_comppad = ocomppad; | |
848 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **); | |
dd2155a4 | 849 | } |
b5c19bd7 | 850 | return new_offset; |
dd2155a4 DM |
851 | } |
852 | ||
b5c19bd7 | 853 | |
dd2155a4 DM |
854 | /* |
855 | =for apidoc pad_sv | |
856 | ||
857 | Get the value at offset po in the current pad. | |
858 | Use macro PAD_SV instead of calling this function directly. | |
859 | ||
860 | =cut | |
861 | */ | |
862 | ||
863 | ||
864 | SV * | |
865 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
866 | { | |
f3548bdc | 867 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 | 868 | |
dd2155a4 DM |
869 | if (!po) |
870 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
871 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
872 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 873 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 DM |
874 | ); |
875 | return PL_curpad[po]; | |
876 | } | |
877 | ||
878 | ||
879 | /* | |
880 | =for apidoc pad_setsv | |
881 | ||
882 | Set the entry at offset po in the current pad to sv. | |
883 | Use the macro PAD_SETSV() rather than calling this function directly. | |
884 | ||
885 | =cut | |
886 | */ | |
887 | ||
888 | #ifdef DEBUGGING | |
889 | void | |
890 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
891 | { | |
f3548bdc | 892 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 DM |
893 | |
894 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
895 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 896 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 DM |
897 | ); |
898 | PL_curpad[po] = sv; | |
899 | } | |
900 | #endif | |
901 | ||
902 | ||
903 | ||
904 | /* | |
905 | =for apidoc pad_block_start | |
906 | ||
907 | Update the pad compilation state variables on entry to a new block | |
908 | ||
909 | =cut | |
910 | */ | |
911 | ||
912 | /* XXX DAPM perhaps: | |
913 | * - integrate this in general state-saving routine ??? | |
914 | * - combine with the state-saving going on in pad_new ??? | |
915 | * - introduce a new SAVE type that does all this in one go ? | |
916 | */ | |
917 | ||
918 | void | |
919 | Perl_pad_block_start(pTHX_ int full) | |
920 | { | |
f3548bdc | 921 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 DM |
922 | SAVEI32(PL_comppad_name_floor); |
923 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
924 | if (full) | |
925 | PL_comppad_name_fill = PL_comppad_name_floor; | |
926 | if (PL_comppad_name_floor < 0) | |
927 | PL_comppad_name_floor = 0; | |
928 | SAVEI32(PL_min_intro_pending); | |
929 | SAVEI32(PL_max_intro_pending); | |
930 | PL_min_intro_pending = 0; | |
931 | SAVEI32(PL_comppad_name_fill); | |
932 | SAVEI32(PL_padix_floor); | |
933 | PL_padix_floor = PL_padix; | |
934 | PL_pad_reset_pending = FALSE; | |
935 | } | |
936 | ||
937 | ||
938 | /* | |
939 | =for apidoc intro_my | |
940 | ||
941 | "Introduce" my variables to visible status. | |
942 | ||
943 | =cut | |
944 | */ | |
945 | ||
946 | U32 | |
947 | Perl_intro_my(pTHX) | |
948 | { | |
949 | SV **svp; | |
950 | SV *sv; | |
951 | I32 i; | |
952 | ||
f3548bdc | 953 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 DM |
954 | if (! PL_min_intro_pending) |
955 | return PL_cop_seqmax; | |
956 | ||
957 | svp = AvARRAY(PL_comppad_name); | |
958 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
ee6cee0c DM |
959 | if ((sv = svp[i]) && sv != &PL_sv_undef |
960 | && !SvFAKE(sv) && !SvIVX(sv)) | |
961 | { | |
dd2155a4 DM |
962 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ |
963 | SvNVX(sv) = (NV)PL_cop_seqmax; | |
964 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 965 | "Pad intromy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 | 966 | (long)i, SvPVX(sv), |
4cf4a199 | 967 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 DM |
968 | ); |
969 | } | |
970 | } | |
971 | PL_min_intro_pending = 0; | |
972 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
973 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
974 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
975 | ||
976 | return PL_cop_seqmax++; | |
977 | } | |
978 | ||
979 | /* | |
980 | =for apidoc pad_leavemy | |
981 | ||
982 | Cleanup at end of scope during compilation: set the max seq number for | |
983 | lexicals in this scope and warn of any lexicals that never got introduced. | |
984 | ||
985 | =cut | |
986 | */ | |
987 | ||
988 | void | |
989 | Perl_pad_leavemy(pTHX) | |
990 | { | |
991 | I32 off; | |
992 | SV **svp = AvARRAY(PL_comppad_name); | |
dd2155a4 DM |
993 | |
994 | PL_pad_reset_pending = FALSE; | |
995 | ||
f3548bdc | 996 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 DM |
997 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
998 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
e1ec3a88 | 999 | const SV *sv; |
ee6cee0c DM |
1000 | if ((sv = svp[off]) && sv != &PL_sv_undef |
1001 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) | |
dd2155a4 | 1002 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
35c1215d | 1003 | "%"SVf" never introduced", sv); |
dd2155a4 DM |
1004 | } |
1005 | } | |
1006 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
1007 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
e1ec3a88 | 1008 | const SV *sv; |
ee6cee0c DM |
1009 | if ((sv = svp[off]) && sv != &PL_sv_undef |
1010 | && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) | |
1011 | { | |
dd2155a4 DM |
1012 | SvIVX(sv) = PL_cop_seqmax; |
1013 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 1014 | "Pad leavemy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 | 1015 | (long)off, SvPVX(sv), |
4cf4a199 | 1016 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 DM |
1017 | ); |
1018 | } | |
1019 | } | |
1020 | PL_cop_seqmax++; | |
1021 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1022 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
1023 | } | |
1024 | ||
1025 | ||
1026 | /* | |
1027 | =for apidoc pad_swipe | |
1028 | ||
1029 | Abandon the tmp in the current pad at offset po and replace with a | |
1030 | new one. | |
1031 | ||
1032 | =cut | |
1033 | */ | |
1034 | ||
1035 | void | |
1036 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
1037 | { | |
f3548bdc | 1038 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 DM |
1039 | if (!PL_curpad) |
1040 | return; | |
1041 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1042 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
1043 | if (!po) | |
1044 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
1045 | ||
1046 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1047 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
1048 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
1049 | ||
1050 | if (PL_curpad[po]) | |
1051 | SvPADTMP_off(PL_curpad[po]); | |
1052 | if (refadjust) | |
1053 | SvREFCNT_dec(PL_curpad[po]); | |
1054 | ||
1055 | PL_curpad[po] = NEWSV(1107,0); | |
1056 | SvPADTMP_on(PL_curpad[po]); | |
1057 | if ((I32)po < PL_padix) | |
1058 | PL_padix = po - 1; | |
1059 | } | |
1060 | ||
1061 | ||
1062 | /* | |
1063 | =for apidoc pad_reset | |
1064 | ||
1065 | Mark all the current temporaries for reuse | |
1066 | ||
1067 | =cut | |
1068 | */ | |
1069 | ||
1070 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
1071 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
1072 | * on the stack by OPs that use them, there are several ways to get an alias | |
1073 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
1074 | * We avoid doing this until we can think of a Better Way. | |
1075 | * GSAR 97-10-29 */ | |
1076 | void | |
1077 | Perl_pad_reset(pTHX) | |
1078 | { | |
1079 | #ifdef USE_BROKEN_PAD_RESET | |
dd2155a4 DM |
1080 | if (AvARRAY(PL_comppad) != PL_curpad) |
1081 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
1082 | ||
1083 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1084 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
1085 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1086 | (long)PL_padix, (long)PL_padix_floor | |
1087 | ) | |
1088 | ); | |
1089 | ||
1090 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
e1ec3a88 | 1091 | register I32 po; |
dd2155a4 DM |
1092 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1093 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1094 | SvPADTMP_off(PL_curpad[po]); | |
1095 | } | |
1096 | PL_padix = PL_padix_floor; | |
1097 | } | |
1098 | #endif | |
1099 | PL_pad_reset_pending = FALSE; | |
1100 | } | |
1101 | ||
1102 | ||
1103 | /* | |
1104 | =for apidoc pad_tidy | |
1105 | ||
1106 | Tidy up a pad after we've finished compiling it: | |
1107 | * remove most stuff from the pads of anonsub prototypes; | |
1108 | * give it a @_; | |
1109 | * mark tmps as such. | |
1110 | ||
1111 | =cut | |
1112 | */ | |
1113 | ||
1114 | /* XXX DAPM surely most of this stuff should be done properly | |
1115 | * at the right time beforehand, rather than going around afterwards | |
1116 | * cleaning up our mistakes ??? | |
1117 | */ | |
1118 | ||
1119 | void | |
1120 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1121 | { | |
1122 | PADOFFSET ix; | |
1123 | ||
f3548bdc | 1124 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 DM |
1125 | |
1126 | /* If this CV has had any 'eval-capable' ops planted in it | |
1127 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any | |
1128 | * anon prototypes in the chain of CVs should be marked as cloneable, | |
1129 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets | |
1130 | * the right CvOUTSIDE. | |
1131 | * If running with -d, *any* sub may potentially have an eval | |
1132 | * excuted within it. | |
1133 | */ | |
1134 | ||
1135 | if (PL_cv_has_eval || PL_perldb) { | |
e1ec3a88 | 1136 | const CV *cv; |
b5c19bd7 DM |
1137 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1138 | if (cv != PL_compcv && CvCOMPILED(cv)) | |
1139 | break; /* no need to mark already-compiled code */ | |
1140 | if (CvANON(cv)) { | |
1141 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1142 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); | |
1143 | CvCLONE_on(cv); | |
1144 | } | |
1145 | } | |
1146 | } | |
1147 | ||
dd2155a4 DM |
1148 | /* extend curpad to match namepad */ |
1149 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
1150 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); | |
1151 | ||
1152 | if (type == padtidy_SUBCLONE) { | |
1153 | SV **namep = AvARRAY(PL_comppad_name); | |
b5c19bd7 | 1154 | |
dd2155a4 DM |
1155 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1156 | SV *namesv; | |
1157 | ||
1158 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1159 | continue; | |
1160 | /* | |
1161 | * The only things that a clonable function needs in its | |
b5c19bd7 | 1162 | * pad are anonymous subs. |
dd2155a4 DM |
1163 | * The rest are created anew during cloning. |
1164 | */ | |
1165 | if (!((namesv = namep[ix]) != Nullsv && | |
1166 | namesv != &PL_sv_undef && | |
b5c19bd7 | 1167 | *SvPVX(namesv) == '&')) |
dd2155a4 DM |
1168 | { |
1169 | SvREFCNT_dec(PL_curpad[ix]); | |
1170 | PL_curpad[ix] = Nullsv; | |
1171 | } | |
1172 | } | |
1173 | } | |
1174 | else if (type == padtidy_SUB) { | |
1175 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
1176 | AV *av = newAV(); /* Will be @_ */ | |
1177 | av_extend(av, 0); | |
1178 | av_store(PL_comppad, 0, (SV*)av); | |
1179 | AvFLAGS(av) = AVf_REIFY; | |
1180 | } | |
1181 | ||
1182 | /* XXX DAPM rationalise these two similar branches */ | |
1183 | ||
1184 | if (type == padtidy_SUB) { | |
1185 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1186 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1187 | continue; | |
1188 | if (!SvPADMY(PL_curpad[ix])) | |
1189 | SvPADTMP_on(PL_curpad[ix]); | |
1190 | } | |
1191 | } | |
1192 | else if (type == padtidy_FORMAT) { | |
1193 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1194 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) | |
1195 | SvPADTMP_on(PL_curpad[ix]); | |
1196 | } | |
1197 | } | |
f3548bdc | 1198 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 DM |
1199 | } |
1200 | ||
1201 | ||
1202 | /* | |
1203 | =for apidoc pad_free | |
1204 | ||
1205 | Free the SV at offet po in the current pad. | |
1206 | ||
1207 | =cut | |
1208 | */ | |
1209 | ||
1210 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1211 | void | |
1212 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1213 | { | |
f3548bdc | 1214 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 DM |
1215 | if (!PL_curpad) |
1216 | return; | |
1217 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1218 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1219 | if (!po) | |
1220 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1221 | ||
1222 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1223 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1224 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1225 | ); | |
1226 | ||
1227 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1228 | SvPADTMP_off(PL_curpad[po]); | |
1229 | #ifdef USE_ITHREADS | |
7e736055 HS |
1230 | /* SV could be a shared hash key (eg bugid #19022) */ |
1231 | if ( | |
dd2155a4 | 1232 | #ifdef PERL_COPY_ON_WRITE |
7e736055 HS |
1233 | !SvIsCOW(PL_curpad[po]) |
1234 | #else | |
1235 | !SvFAKE(PL_curpad[po]) | |
dd2155a4 | 1236 | #endif |
7e736055 | 1237 | ) |
dd2155a4 | 1238 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 DM |
1239 | #endif |
1240 | } | |
1241 | if ((I32)po < PL_padix) | |
1242 | PL_padix = po - 1; | |
1243 | } | |
1244 | ||
1245 | ||
1246 | ||
1247 | /* | |
1248 | =for apidoc do_dump_pad | |
1249 | ||
1250 | Dump the contents of a padlist | |
1251 | ||
1252 | =cut | |
1253 | */ | |
1254 | ||
1255 | void | |
1256 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1257 | { | |
e1ec3a88 AL |
1258 | const AV *pad_name; |
1259 | const AV *pad; | |
dd2155a4 DM |
1260 | SV **pname; |
1261 | SV **ppad; | |
dd2155a4 DM |
1262 | I32 ix; |
1263 | ||
1264 | if (!padlist) { | |
1265 | return; | |
1266 | } | |
1267 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); | |
1268 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); | |
1269 | pname = AvARRAY(pad_name); | |
1270 | ppad = AvARRAY(pad); | |
1271 | Perl_dump_indent(aTHX_ level, file, | |
1272 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1273 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1274 | ); | |
1275 | ||
1276 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
e1ec3a88 | 1277 | const SV *namesv = pname[ix]; |
dd2155a4 DM |
1278 | if (namesv && namesv == &PL_sv_undef) { |
1279 | namesv = Nullsv; | |
1280 | } | |
1281 | if (namesv) { | |
ee6cee0c DM |
1282 | if (SvFAKE(namesv)) |
1283 | Perl_dump_indent(aTHX_ level+1, file, | |
c0fd1b42 | 1284 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c DM |
1285 | (int) ix, |
1286 | PTR2UV(ppad[ix]), | |
1287 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
b5c19bd7 DM |
1288 | SvPVX(namesv), |
1289 | (unsigned long)SvIVX(namesv), | |
1290 | (unsigned long)SvNVX(namesv) | |
1291 | ||
ee6cee0c DM |
1292 | ); |
1293 | else | |
1294 | Perl_dump_indent(aTHX_ level+1, file, | |
b5c19bd7 | 1295 | "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n", |
ee6cee0c DM |
1296 | (int) ix, |
1297 | PTR2UV(ppad[ix]), | |
1298 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
4cf4a199 | 1299 | (long)U_32(SvNVX(namesv)), |
b5c19bd7 | 1300 | (long)SvIVX(namesv), |
e9d09c08 | 1301 | SvPVX(namesv) |
ee6cee0c | 1302 | ); |
dd2155a4 DM |
1303 | } |
1304 | else if (full) { | |
1305 | Perl_dump_indent(aTHX_ level+1, file, | |
1306 | "%2d. 0x%"UVxf"<%lu>\n", | |
1307 | (int) ix, | |
1308 | PTR2UV(ppad[ix]), | |
1309 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1310 | ); | |
1311 | } | |
1312 | } | |
1313 | } | |
1314 | ||
1315 | ||
1316 | ||
1317 | /* | |
1318 | =for apidoc cv_dump | |
1319 | ||
1320 | dump the contents of a CV | |
1321 | ||
1322 | =cut | |
1323 | */ | |
1324 | ||
1325 | #ifdef DEBUGGING | |
1326 | STATIC void | |
e1ec3a88 | 1327 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
dd2155a4 | 1328 | { |
e1ec3a88 | 1329 | const CV *outside = CvOUTSIDE(cv); |
dd2155a4 DM |
1330 | AV* padlist = CvPADLIST(cv); |
1331 | ||
1332 | PerlIO_printf(Perl_debug_log, | |
1333 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1334 | title, | |
1335 | PTR2UV(cv), | |
1336 | (CvANON(cv) ? "ANON" | |
71f882da | 1337 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 DM |
1338 | : (cv == PL_main_cv) ? "MAIN" |
1339 | : CvUNIQUE(cv) ? "UNIQUE" | |
1340 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1341 | PTR2UV(outside), | |
1342 | (!outside ? "null" | |
1343 | : CvANON(outside) ? "ANON" | |
1344 | : (outside == PL_main_cv) ? "MAIN" | |
1345 | : CvUNIQUE(outside) ? "UNIQUE" | |
1346 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1347 | ||
1348 | PerlIO_printf(Perl_debug_log, | |
1349 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1350 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1351 | } | |
1352 | #endif /* DEBUGGING */ | |
1353 | ||
1354 | ||
1355 | ||
1356 | ||
1357 | ||
1358 | /* | |
1359 | =for apidoc cv_clone | |
1360 | ||
1361 | Clone a CV: make a new CV which points to the same code etc, but which | |
1362 | has a newly-created pad built by copying the prototype pad and capturing | |
1363 | any outer lexicals. | |
1364 | ||
1365 | =cut | |
1366 | */ | |
1367 | ||
1368 | CV * | |
1369 | Perl_cv_clone(pTHX_ CV *proto) | |
1370 | { | |
dd2155a4 DM |
1371 | I32 ix; |
1372 | AV* protopadlist = CvPADLIST(proto); | |
e1ec3a88 AL |
1373 | const AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); |
1374 | const AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); | |
dd2155a4 DM |
1375 | SV** pname = AvARRAY(protopad_name); |
1376 | SV** ppad = AvARRAY(protopad); | |
e1ec3a88 AL |
1377 | const I32 fname = AvFILLp(protopad_name); |
1378 | const I32 fpad = AvFILLp(protopad); | |
dd2155a4 DM |
1379 | AV* comppadlist; |
1380 | CV* cv; | |
b5c19bd7 DM |
1381 | SV** outpad; |
1382 | CV* outside; | |
71f882da | 1383 | long depth; |
dd2155a4 DM |
1384 | |
1385 | assert(!CvUNIQUE(proto)); | |
1386 | ||
71f882da DM |
1387 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1388 | * to a prototype; we instead want the cloned parent who called us. | |
1389 | * Note that in general for formats, CvOUTSIDE != find_runcv */ | |
1390 | ||
1391 | outside = CvOUTSIDE(proto); | |
1392 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) | |
1393 | outside = find_runcv(NULL); | |
1394 | depth = CvDEPTH(outside); | |
1395 | assert(depth || SvTYPE(proto) == SVt_PVFM); | |
1396 | if (!depth) | |
1397 | depth = 1; | |
b5c19bd7 DM |
1398 | assert(CvPADLIST(outside)); |
1399 | ||
dd2155a4 DM |
1400 | ENTER; |
1401 | SAVESPTR(PL_compcv); | |
1402 | ||
1403 | cv = PL_compcv = (CV*)NEWSV(1104, 0); | |
1404 | sv_upgrade((SV *)cv, SvTYPE(proto)); | |
7dafbf52 | 1405 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 DM |
1406 | CvCLONED_on(cv); |
1407 | ||
dd2155a4 DM |
1408 | #ifdef USE_ITHREADS |
1409 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) | |
1410 | : savepv(CvFILE(proto)); | |
1411 | #else | |
1412 | CvFILE(cv) = CvFILE(proto); | |
1413 | #endif | |
1414 | CvGV(cv) = CvGV(proto); | |
1415 | CvSTASH(cv) = CvSTASH(proto); | |
b34c0dd4 | 1416 | OP_REFCNT_LOCK; |
dd2155a4 | 1417 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
b34c0dd4 | 1418 | OP_REFCNT_UNLOCK; |
dd2155a4 | 1419 | CvSTART(cv) = CvSTART(proto); |
b5c19bd7 DM |
1420 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
1421 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); | |
dd2155a4 DM |
1422 | |
1423 | if (SvPOK(proto)) | |
1424 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); | |
1425 | ||
1426 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); | |
1427 | ||
b5c19bd7 | 1428 | av_fill(PL_comppad, fpad); |
dd2155a4 DM |
1429 | for (ix = fname; ix >= 0; ix--) |
1430 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1431 | ||
dd2155a4 DM |
1432 | PL_curpad = AvARRAY(PL_comppad); |
1433 | ||
71f882da | 1434 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 | 1435 | |
dd2155a4 DM |
1436 | for (ix = fpad; ix > 0; ix--) { |
1437 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; | |
71f882da DM |
1438 | SV *sv = Nullsv; |
1439 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ | |
b5c19bd7 | 1440 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
71f882da DM |
1441 | sv = outpad[(I32)SvNVX(namesv)]; |
1442 | assert(sv); | |
1443 | /* formats may have an inactive parent */ | |
1444 | if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { | |
1445 | if (ckWARN(WARN_CLOSURE)) | |
1446 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
1447 | "Variable \"%s\" is not available", SvPVX(namesv)); | |
1448 | sv = Nullsv; | |
1449 | } | |
1450 | else { | |
1451 | assert(!SvPADSTALE(sv)); | |
1452 | sv = SvREFCNT_inc(sv); | |
1453 | } | |
dd2155a4 | 1454 | } |
71f882da | 1455 | if (!sv) { |
e1ec3a88 AL |
1456 | const char sigil = SvPVX(namesv)[0]; |
1457 | if (sigil == '&') | |
dd2155a4 | 1458 | sv = SvREFCNT_inc(ppad[ix]); |
e1ec3a88 | 1459 | else if (sigil == '@') |
dd2155a4 | 1460 | sv = (SV*)newAV(); |
e1ec3a88 | 1461 | else if (sigil == '%') |
dd2155a4 DM |
1462 | sv = (SV*)newHV(); |
1463 | else | |
1464 | sv = NEWSV(0, 0); | |
235cc2e3 | 1465 | SvPADMY_on(sv); |
dd2155a4 DM |
1466 | } |
1467 | } | |
1468 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
71f882da | 1469 | sv = SvREFCNT_inc(ppad[ix]); |
dd2155a4 DM |
1470 | } |
1471 | else { | |
b5c19bd7 | 1472 | sv = NEWSV(0, 0); |
dd2155a4 | 1473 | SvPADTMP_on(sv); |
dd2155a4 | 1474 | } |
71f882da | 1475 | PL_curpad[ix] = sv; |
dd2155a4 DM |
1476 | } |
1477 | ||
dd2155a4 DM |
1478 | DEBUG_Xv( |
1479 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1480 | cv_dump(outside, "Outside"); | |
1481 | cv_dump(proto, "Proto"); | |
1482 | cv_dump(cv, "To"); | |
1483 | ); | |
1484 | ||
1485 | LEAVE; | |
1486 | ||
1487 | if (CvCONST(cv)) { | |
b5c19bd7 DM |
1488 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1489 | * The prototype was marked as a candiate for const-ization, | |
1490 | * so try to grab the current const value, and if successful, | |
1491 | * turn into a const sub: | |
1492 | */ | |
dd2155a4 | 1493 | SV* const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 DM |
1494 | if (const_sv) { |
1495 | SvREFCNT_dec(cv); | |
1496 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); | |
1497 | } | |
1498 | else { | |
1499 | CvCONST_off(cv); | |
1500 | } | |
dd2155a4 DM |
1501 | } |
1502 | ||
1503 | return cv; | |
1504 | } | |
1505 | ||
1506 | ||
1507 | /* | |
1508 | =for apidoc pad_fixup_inner_anons | |
1509 | ||
1510 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
7dafbf52 DM |
1511 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1512 | moved to a pre-existing CV struct. | |
dd2155a4 DM |
1513 | |
1514 | =cut | |
1515 | */ | |
1516 | ||
1517 | void | |
1518 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1519 | { | |
1520 | I32 ix; | |
1521 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; | |
1522 | AV *comppad = (AV*)AvARRAY(padlist)[1]; | |
1523 | SV **namepad = AvARRAY(comppad_name); | |
1524 | SV **curpad = AvARRAY(comppad); | |
1525 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { | |
e1ec3a88 | 1526 | const SV *namesv = namepad[ix]; |
dd2155a4 DM |
1527 | if (namesv && namesv != &PL_sv_undef |
1528 | && *SvPVX(namesv) == '&') | |
1529 | { | |
1530 | CV *innercv = (CV*)curpad[ix]; | |
7dafbf52 DM |
1531 | assert(CvWEAKOUTSIDE(innercv)); |
1532 | assert(CvOUTSIDE(innercv) == old_cv); | |
1533 | CvOUTSIDE(innercv) = new_cv; | |
dd2155a4 DM |
1534 | } |
1535 | } | |
1536 | } | |
1537 | ||
7dafbf52 | 1538 | |
dd2155a4 DM |
1539 | /* |
1540 | =for apidoc pad_push | |
1541 | ||
1542 | Push a new pad frame onto the padlist, unless there's already a pad at | |
26019298 AL |
1543 | this depth, in which case don't bother creating a new one. Then give |
1544 | the new pad an @_ in slot zero. | |
dd2155a4 DM |
1545 | |
1546 | =cut | |
1547 | */ | |
1548 | ||
1549 | void | |
26019298 | 1550 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
dd2155a4 DM |
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]); | |
e1ec3a88 | 1560 | const I32 names_fill = AvFILLp((AV*)svp[0]); |
dd2155a4 | 1561 | SV** names = AvARRAY(svp[0]); |
26019298 AL |
1562 | AV *av; |
1563 | ||
dd2155a4 DM |
1564 | for ( ;ix > 0; ix--) { |
1565 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
26019298 AL |
1566 | const char sigil = SvPVX(names[ix])[0]; |
1567 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') { | |
dd2155a4 DM |
1568 | /* outer lexical or anon code */ |
1569 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1570 | } | |
1571 | else { /* our own lexical */ | |
26019298 AL |
1572 | SV *sv; |
1573 | if (sigil == '@') | |
1574 | sv = (SV*)newAV(); | |
1575 | else if (sigil == '%') | |
1576 | sv = (SV*)newHV(); | |
dd2155a4 | 1577 | else |
26019298 AL |
1578 | sv = NEWSV(0, 0); |
1579 | av_store(newpad, ix, sv); | |
dd2155a4 DM |
1580 | SvPADMY_on(sv); |
1581 | } | |
1582 | } | |
1583 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
26019298 | 1584 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
dd2155a4 DM |
1585 | } |
1586 | else { | |
1587 | /* save temporaries on recursion? */ | |
26019298 AL |
1588 | SV *sv = NEWSV(0, 0); |
1589 | av_store(newpad, ix, sv); | |
dd2155a4 DM |
1590 | SvPADTMP_on(sv); |
1591 | } | |
1592 | } | |
26019298 AL |
1593 | av = newAV(); |
1594 | av_extend(av, 0); | |
1595 | av_store(newpad, 0, (SV*)av); | |
1596 | AvFLAGS(av) = AVf_REIFY; | |
1597 | ||
dd2155a4 DM |
1598 | av_store(padlist, depth, (SV*)newpad); |
1599 | AvFILLp(padlist) = depth; | |
1600 | } | |
1601 | } |