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dd2155a4 DM |
1 | /* pad.c |
2 | * | |
4c79ee7a | 3 | * Copyright (c) 2003, Larry Wall |
dd2155a4 DM |
4 | * |
5 | * You may distribute under the terms of either the GNU General Public | |
6 | * License or the Artistic License, as specified in the README file. | |
7 | * | |
8 | * "Anyway: there was this Mr Frodo left an orphan and stranded, as you | |
9 | * might say, among those queer Bucklanders, being brought up anyhow in | |
10 | * Brandy Hall. A regular warren, by all accounts. Old Master Gorbadoc | |
11 | * never had fewer than a couple of hundred relations in the place. Mr | |
12 | * Bilbo never did a kinder deed than when he brought the lad back to | |
13 | * live among decent folk." --the Gaffer | |
14 | */ | |
15 | ||
16 | /* XXX DAPM | |
17 | * As of Sept 2002, this file is new and may be in a state of flux for | |
18 | * a while. I've marked things I intent to come back and look at further | |
19 | * with an 'XXX DAPM' comment. | |
20 | */ | |
21 | ||
22 | /* | |
23 | =head1 Pad Data Structures | |
24 | ||
25 | =for apidoc m|AV *|CvPADLIST|CV *cv | |
26 | CV's can have CvPADLIST(cv) set to point to an AV. | |
27 | ||
28 | For these purposes "forms" are a kind-of CV, eval""s are too (except they're | |
29 | not callable at will and are always thrown away after the eval"" is done | |
30 | executing). | |
31 | ||
32 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, | |
33 | but that is really the callers pad (a slot of which is allocated by | |
34 | every entersub). | |
35 | ||
36 | The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items | |
f3548bdc | 37 | is managed "manual" (mostly in pad.c) rather than normal av.c rules. |
dd2155a4 DM |
38 | The items in the AV are not SVs as for a normal AV, but other AVs: |
39 | ||
40 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather | |
41 | the "static type information" for lexicals. | |
42 | ||
43 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that | |
44 | depth of recursion into the CV. | |
45 | The 0'th slot of a frame AV is an AV which is @_. | |
46 | other entries are storage for variables and op targets. | |
47 | ||
48 | During compilation: | |
a6d05634 TM |
49 | C<PL_comppad_name> is set to the names AV. |
50 | C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1. | |
51 | C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)). | |
dd2155a4 | 52 | |
f3548bdc DM |
53 | During execution, C<PL_comppad> and C<PL_curpad> refer to the live |
54 | frame of the currently executing sub. | |
55 | ||
56 | Iterating over the names AV iterates over all possible pad | |
dd2155a4 DM |
57 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
58 | &PL_sv_undef "names" (see pad_alloc()). | |
59 | ||
60 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. | |
61 | The rest are op targets/GVs/constants which are statically allocated | |
62 | or resolved at compile time. These don't have names by which they | |
63 | can be looked up from Perl code at run time through eval"" like | |
64 | my/our variables can be. Since they can't be looked up by "name" | |
65 | but only by their index allocated at compile time (which is usually | |
66 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. | |
67 | ||
68 | The SVs in the names AV have their PV being the name of the variable. | |
69 | NV+1..IV inclusive is a range of cop_seq numbers for which the name is | |
70 | valid. For typed lexicals name SV is SVt_PVMG and SvSTASH points at the | |
71 | type. For C<our> lexicals, the type is SVt_PVGV, and GvSTASH points at the | |
72 | stash of the associated global (so that duplicate C<our> delarations in the | |
73 | same package can be detected). SvCUR is sometimes hijacked to | |
74 | store the generation number during compilation. | |
75 | ||
76 | If SvFAKE is set on the name SV then slot in the frame AVs are | |
ee6cee0c DM |
77 | a REFCNT'ed references to a lexical from "outside". In this case, |
78 | the name SV does not have a cop_seq range, since it is in scope | |
79 | throughout. | |
dd2155a4 | 80 | |
a6d05634 | 81 | If the 'name' is '&' the corresponding entry in frame AV |
dd2155a4 DM |
82 | is a CV representing a possible closure. |
83 | (SvFAKE and name of '&' is not a meaningful combination currently but could | |
84 | become so if C<my sub foo {}> is implemented.) | |
85 | ||
86 | =cut | |
87 | */ | |
88 | ||
89 | ||
90 | #include "EXTERN.h" | |
91 | #define PERL_IN_PAD_C | |
92 | #include "perl.h" | |
93 | ||
94 | ||
95 | #define PAD_MAX 999999999 | |
96 | ||
97 | ||
98 | ||
99 | /* | |
100 | =for apidoc pad_new | |
101 | ||
102 | Create a new compiling padlist, saving and updating the various global | |
103 | vars at the same time as creating the pad itself. The following flags | |
104 | can be OR'ed together: | |
105 | ||
106 | padnew_CLONE this pad is for a cloned CV | |
107 | padnew_SAVE save old globals | |
108 | padnew_SAVESUB also save extra stuff for start of sub | |
109 | ||
110 | =cut | |
111 | */ | |
112 | ||
113 | PADLIST * | |
c7c737cb | 114 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 DM |
115 | { |
116 | AV *padlist, *padname, *pad, *a0; | |
117 | ||
f3548bdc DM |
118 | ASSERT_CURPAD_LEGAL("pad_new"); |
119 | ||
dd2155a4 DM |
120 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
121 | * vars (based on flags) rather than storing vals + addresses for | |
122 | * each individually. Also see pad_block_start. | |
123 | * XXX DAPM Try to see whether all these conditionals are required | |
124 | */ | |
125 | ||
126 | /* save existing state, ... */ | |
127 | ||
128 | if (flags & padnew_SAVE) { | |
3979c56f | 129 | SAVECOMPPAD(); |
dd2155a4 DM |
130 | SAVESPTR(PL_comppad_name); |
131 | if (! (flags & padnew_CLONE)) { | |
132 | SAVEI32(PL_padix); | |
133 | SAVEI32(PL_comppad_name_fill); | |
134 | SAVEI32(PL_min_intro_pending); | |
135 | SAVEI32(PL_max_intro_pending); | |
136 | if (flags & padnew_SAVESUB) { | |
137 | SAVEI32(PL_pad_reset_pending); | |
138 | } | |
139 | } | |
140 | } | |
141 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be | |
142 | * saved - check at some pt that this is okay */ | |
143 | ||
144 | /* ... create new pad ... */ | |
145 | ||
146 | padlist = newAV(); | |
147 | padname = newAV(); | |
148 | pad = newAV(); | |
149 | ||
150 | if (flags & padnew_CLONE) { | |
151 | /* XXX DAPM I dont know why cv_clone needs it | |
152 | * doing differently yet - perhaps this separate branch can be | |
153 | * dispensed with eventually ??? | |
154 | */ | |
155 | ||
156 | a0 = newAV(); /* will be @_ */ | |
157 | av_extend(a0, 0); | |
158 | av_store(pad, 0, (SV*)a0); | |
159 | AvFLAGS(a0) = AVf_REIFY; | |
160 | } | |
161 | else { | |
dd2155a4 | 162 | av_store(pad, 0, Nullsv); |
dd2155a4 DM |
163 | } |
164 | ||
165 | AvREAL_off(padlist); | |
166 | av_store(padlist, 0, (SV*)padname); | |
167 | av_store(padlist, 1, (SV*)pad); | |
168 | ||
169 | /* ... then update state variables */ | |
170 | ||
171 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); | |
172 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); | |
173 | PL_curpad = AvARRAY(PL_comppad); | |
174 | ||
175 | if (! (flags & padnew_CLONE)) { | |
176 | PL_comppad_name_fill = 0; | |
177 | PL_min_intro_pending = 0; | |
178 | PL_padix = 0; | |
179 | } | |
180 | ||
181 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
182 | "Pad 0x%"UVxf"[0x%"UVxf"] new: padlist=0x%"UVxf | |
183 | " name=0x%"UVxf" flags=0x%"UVxf"\n", | |
184 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(padlist), | |
185 | PTR2UV(padname), (UV)flags | |
186 | ) | |
187 | ); | |
188 | ||
189 | return (PADLIST*)padlist; | |
190 | } | |
191 | ||
192 | /* | |
193 | =for apidoc pad_undef | |
194 | ||
195 | Free the padlist associated with a CV. | |
196 | If parts of it happen to be current, we null the relevant | |
197 | PL_*pad* global vars so that we don't have any dangling references left. | |
198 | We also repoint the CvOUTSIDE of any about-to-be-orphaned | |
a3985cdc | 199 | inner subs to the outer of this cv. |
dd2155a4 | 200 | |
7dafbf52 DM |
201 | (This function should really be called pad_free, but the name was already |
202 | taken) | |
203 | ||
dd2155a4 DM |
204 | =cut |
205 | */ | |
206 | ||
207 | void | |
a3985cdc | 208 | Perl_pad_undef(pTHX_ CV* cv) |
dd2155a4 DM |
209 | { |
210 | I32 ix; | |
211 | PADLIST *padlist = CvPADLIST(cv); | |
212 | ||
213 | if (!padlist) | |
214 | return; | |
215 | if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */ | |
216 | return; | |
217 | ||
218 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
219 | "Pad undef: padlist=0x%"UVxf"\n" , PTR2UV(padlist)) | |
220 | ); | |
221 | ||
7dafbf52 DM |
222 | /* detach any '&' anon children in the pad; if afterwards they |
223 | * are still live, fix up their CvOUTSIDEs to point to our outside, | |
224 | * bypassing us. */ | |
225 | /* XXX DAPM for efficiency, we should only do this if we know we have | |
226 | * children, or integrate this loop with general cleanup */ | |
dd2155a4 | 227 | |
7dafbf52 DM |
228 | if (!PL_dirty) { /* don't bother during global destruction */ |
229 | CV *outercv = CvOUTSIDE(cv); | |
230 | U32 seq = CvOUTSIDE_SEQ(cv); | |
dd2155a4 DM |
231 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
232 | SV **namepad = AvARRAY(comppad_name); | |
233 | AV *comppad = (AV*)AvARRAY(padlist)[1]; | |
234 | SV **curpad = AvARRAY(comppad); | |
235 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { | |
236 | SV *namesv = namepad[ix]; | |
237 | if (namesv && namesv != &PL_sv_undef | |
7dafbf52 | 238 | && *SvPVX(namesv) == '&') |
dd2155a4 DM |
239 | { |
240 | CV *innercv = (CV*)curpad[ix]; | |
7dafbf52 DM |
241 | namepad[ix] = Nullsv; |
242 | SvREFCNT_dec(namesv); | |
243 | curpad[ix] = Nullsv; | |
244 | SvREFCNT_dec(innercv); | |
245 | if (SvREFCNT(innercv) /* in use, not just a prototype */ | |
dd2155a4 DM |
246 | && CvOUTSIDE(innercv) == cv) |
247 | { | |
7dafbf52 DM |
248 | assert(CvWEAKOUTSIDE(innercv)); |
249 | CvWEAKOUTSIDE_off(innercv); | |
dd2155a4 | 250 | CvOUTSIDE(innercv) = outercv; |
a3985cdc | 251 | CvOUTSIDE_SEQ(innercv) = seq; |
7dafbf52 | 252 | SvREFCNT_inc(outercv); |
dd2155a4 DM |
253 | } |
254 | } | |
255 | } | |
256 | } | |
7dafbf52 | 257 | |
dd2155a4 DM |
258 | ix = AvFILLp(padlist); |
259 | while (ix >= 0) { | |
260 | SV* sv = AvARRAY(padlist)[ix--]; | |
261 | if (!sv) | |
262 | continue; | |
263 | if (sv == (SV*)PL_comppad_name) | |
264 | PL_comppad_name = Nullav; | |
265 | else if (sv == (SV*)PL_comppad) { | |
f3548bdc | 266 | PL_comppad = Null(PAD*); |
dd2155a4 DM |
267 | PL_curpad = Null(SV**); |
268 | } | |
269 | SvREFCNT_dec(sv); | |
270 | } | |
271 | SvREFCNT_dec((SV*)CvPADLIST(cv)); | |
272 | CvPADLIST(cv) = Null(PADLIST*); | |
273 | } | |
274 | ||
275 | ||
276 | ||
277 | ||
278 | /* | |
279 | =for apidoc pad_add_name | |
280 | ||
281 | Create a new name in the current pad at the specified offset. | |
282 | If C<typestash> is valid, the name is for a typed lexical; set the | |
283 | name's stash to that value. | |
284 | If C<ourstash> is valid, it's an our lexical, set the name's | |
285 | GvSTASH to that value | |
286 | ||
287 | Also, if the name is @.. or %.., create a new array or hash for that slot | |
288 | ||
289 | If fake, it means we're cloning an existing entry | |
290 | ||
291 | =cut | |
292 | */ | |
293 | ||
294 | /* | |
295 | * XXX DAPM this doesn't seem the right place to create a new array/hash. | |
296 | * Whatever we do, we should be consistent - create scalars too, and | |
297 | * create even if fake. Really need to integrate better the whole entry | |
298 | * creation business - when + where does the name and value get created? | |
299 | */ | |
300 | ||
301 | PADOFFSET | |
302 | Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) | |
303 | { | |
304 | PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); | |
305 | SV* namesv = NEWSV(1102, 0); | |
dd2155a4 | 306 | |
f3548bdc DM |
307 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
308 | ||
dd2155a4 DM |
309 | |
310 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
ee6cee0c DM |
311 | "Pad addname: %ld \"%s\"%s\n", |
312 | (long)offset, name, (fake ? " FAKE" : "") | |
dd2155a4 DM |
313 | ) |
314 | ); | |
315 | ||
316 | sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); | |
317 | sv_setpv(namesv, name); | |
318 | ||
319 | if (typestash) { | |
320 | SvFLAGS(namesv) |= SVpad_TYPED; | |
321 | SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) typestash); | |
322 | } | |
323 | if (ourstash) { | |
324 | SvFLAGS(namesv) |= SVpad_OUR; | |
325 | GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash); | |
326 | } | |
327 | ||
328 | av_store(PL_comppad_name, offset, namesv); | |
dd2155a4 DM |
329 | if (fake) |
330 | SvFAKE_on(namesv); | |
331 | else { | |
ee6cee0c DM |
332 | /* not yet introduced */ |
333 | SvNVX(namesv) = (NV)PAD_MAX; /* min */ | |
334 | SvIVX(namesv) = 0; /* max */ | |
335 | ||
dd2155a4 DM |
336 | if (!PL_min_intro_pending) |
337 | PL_min_intro_pending = offset; | |
338 | PL_max_intro_pending = offset; | |
f3548bdc DM |
339 | /* XXX DAPM since slot has been allocated, replace |
340 | * av_store with PL_curpad[offset] ? */ | |
dd2155a4 DM |
341 | if (*name == '@') |
342 | av_store(PL_comppad, offset, (SV*)newAV()); | |
343 | else if (*name == '%') | |
344 | av_store(PL_comppad, offset, (SV*)newHV()); | |
345 | SvPADMY_on(PL_curpad[offset]); | |
346 | } | |
347 | ||
348 | return offset; | |
349 | } | |
350 | ||
351 | ||
352 | ||
353 | ||
354 | /* | |
355 | =for apidoc pad_alloc | |
356 | ||
357 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto | |
358 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards | |
359 | for a slot which has no name and and no active value. | |
360 | ||
361 | =cut | |
362 | */ | |
363 | ||
364 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), | |
365 | * or at least rationalise ??? */ | |
366 | ||
367 | ||
368 | PADOFFSET | |
369 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) | |
370 | { | |
371 | SV *sv; | |
372 | I32 retval; | |
373 | ||
f3548bdc DM |
374 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
375 | ||
dd2155a4 DM |
376 | if (AvARRAY(PL_comppad) != PL_curpad) |
377 | Perl_croak(aTHX_ "panic: pad_alloc"); | |
378 | if (PL_pad_reset_pending) | |
379 | pad_reset(); | |
380 | if (tmptype & SVs_PADMY) { | |
235cc2e3 | 381 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
dd2155a4 DM |
382 | retval = AvFILLp(PL_comppad); |
383 | } | |
384 | else { | |
385 | SV **names = AvARRAY(PL_comppad_name); | |
386 | SSize_t names_fill = AvFILLp(PL_comppad_name); | |
387 | for (;;) { | |
388 | /* | |
389 | * "foreach" index vars temporarily become aliases to non-"my" | |
390 | * values. Thus we must skip, not just pad values that are | |
391 | * marked as current pad values, but also those with names. | |
392 | */ | |
393 | /* HVDS why copy to sv here? we don't seem to use it */ | |
394 | if (++PL_padix <= names_fill && | |
395 | (sv = names[PL_padix]) && sv != &PL_sv_undef) | |
396 | continue; | |
397 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); | |
398 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && | |
399 | !IS_PADGV(sv) && !IS_PADCONST(sv)) | |
400 | break; | |
401 | } | |
402 | retval = PL_padix; | |
403 | } | |
404 | SvFLAGS(sv) |= tmptype; | |
405 | PL_curpad = AvARRAY(PL_comppad); | |
406 | ||
407 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
408 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", | |
409 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, | |
410 | PL_op_name[optype])); | |
411 | return (PADOFFSET)retval; | |
412 | } | |
413 | ||
414 | /* | |
415 | =for apidoc pad_add_anon | |
416 | ||
417 | Add an anon code entry to the current compiling pad | |
418 | ||
419 | =cut | |
420 | */ | |
421 | ||
422 | PADOFFSET | |
423 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) | |
424 | { | |
425 | PADOFFSET ix; | |
426 | SV* name; | |
427 | ||
428 | name = NEWSV(1106, 0); | |
429 | sv_upgrade(name, SVt_PVNV); | |
430 | sv_setpvn(name, "&", 1); | |
431 | SvIVX(name) = -1; | |
432 | SvNVX(name) = 1; | |
433 | ix = pad_alloc(op_type, SVs_PADMY); | |
434 | av_store(PL_comppad_name, ix, name); | |
f3548bdc | 435 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 DM |
436 | av_store(PL_comppad, ix, sv); |
437 | SvPADMY_on(sv); | |
7dafbf52 DM |
438 | |
439 | /* to avoid ref loops, we never have parent + child referencing each | |
440 | * other simultaneously */ | |
441 | if (CvOUTSIDE((CV*)sv)) { | |
442 | assert(!CvWEAKOUTSIDE((CV*)sv)); | |
443 | CvWEAKOUTSIDE_on((CV*)sv); | |
444 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); | |
445 | } | |
dd2155a4 DM |
446 | return ix; |
447 | } | |
448 | ||
449 | ||
450 | ||
451 | /* | |
452 | =for apidoc pad_check_dup | |
453 | ||
454 | Check for duplicate declarations: report any of: | |
455 | * a my in the current scope with the same name; | |
456 | * an our (anywhere in the pad) with the same name and the same stash | |
457 | as C<ourstash> | |
458 | C<is_our> indicates that the name to check is an 'our' declaration | |
459 | ||
460 | =cut | |
461 | */ | |
462 | ||
463 | /* XXX DAPM integrate this into pad_add_name ??? */ | |
464 | ||
465 | void | |
466 | Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) | |
467 | { | |
468 | SV **svp, *sv; | |
469 | PADOFFSET top, off; | |
470 | ||
f3548bdc | 471 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
dd2155a4 DM |
472 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) |
473 | return; /* nothing to check */ | |
474 | ||
475 | svp = AvARRAY(PL_comppad_name); | |
476 | top = AvFILLp(PL_comppad_name); | |
477 | /* check the current scope */ | |
478 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same | |
479 | * type ? */ | |
480 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { | |
481 | if ((sv = svp[off]) | |
482 | && sv != &PL_sv_undef | |
ee6cee0c | 483 | && !SvFAKE(sv) |
dd2155a4 DM |
484 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
485 | && (!is_our | |
486 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) | |
487 | && strEQ(name, SvPVX(sv))) | |
488 | { | |
489 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
490 | "\"%s\" variable %s masks earlier declaration in same %s", | |
491 | (is_our ? "our" : "my"), | |
492 | name, | |
493 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); | |
494 | --off; | |
495 | break; | |
496 | } | |
497 | } | |
498 | /* check the rest of the pad */ | |
499 | if (is_our) { | |
500 | do { | |
501 | if ((sv = svp[off]) | |
502 | && sv != &PL_sv_undef | |
ee6cee0c | 503 | && !SvFAKE(sv) |
dd2155a4 DM |
504 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
505 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) | |
506 | && strEQ(name, SvPVX(sv))) | |
507 | { | |
508 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
509 | "\"our\" variable %s redeclared", name); | |
510 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
511 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
512 | break; | |
513 | } | |
514 | } while ( off-- > 0 ); | |
515 | } | |
516 | } | |
517 | ||
518 | ||
519 | ||
520 | /* | |
521 | =for apidoc pad_findmy | |
522 | ||
523 | Given a lexical name, try to find its offset, first in the current pad, | |
524 | or failing that, in the pads of any lexically enclosing subs (including | |
525 | the complications introduced by eval). If the name is found in an outer pad, | |
526 | then a fake entry is added to the current pad. | |
527 | Returns the offset in the current pad, or NOT_IN_PAD on failure. | |
528 | ||
529 | =cut | |
530 | */ | |
531 | ||
532 | PADOFFSET | |
533 | Perl_pad_findmy(pTHX_ char *name) | |
534 | { | |
535 | I32 off; | |
ee6cee0c | 536 | I32 fake_off = 0; |
dd2155a4 DM |
537 | SV *sv; |
538 | SV **svp = AvARRAY(PL_comppad_name); | |
539 | U32 seq = PL_cop_seqmax; | |
dd2155a4 | 540 | |
f3548bdc | 541 | ASSERT_CURPAD_ACTIVE("pad_findmy"); |
dd2155a4 DM |
542 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad findmy: \"%s\"\n", name)); |
543 | ||
dd2155a4 DM |
544 | /* The one we're looking for is probably just before comppad_name_fill. */ |
545 | for (off = AvFILLp(PL_comppad_name); off > 0; off--) { | |
ee6cee0c DM |
546 | sv = svp[off]; |
547 | if (!sv || sv == &PL_sv_undef || !strEQ(SvPVX(sv), name)) | |
548 | continue; | |
549 | if (SvFAKE(sv)) { | |
550 | /* we'll use this later if we don't find a real entry */ | |
551 | fake_off = off; | |
552 | continue; | |
553 | } | |
554 | else { | |
8716503d DM |
555 | if ( seq > (U32)I_32(SvNVX(sv)) /* min */ |
556 | && seq <= (U32)SvIVX(sv)) /* max */ | |
ee6cee0c | 557 | return off; |
dd2155a4 DM |
558 | } |
559 | } | |
ee6cee0c DM |
560 | if (fake_off) |
561 | return fake_off; | |
dd2155a4 | 562 | |
dd2155a4 | 563 | /* See if it's in a nested scope */ |
a3985cdc | 564 | off = pad_findlex(name, 0, PL_compcv); |
dd2155a4 DM |
565 | if (!off) /* pad_findlex returns 0 for failure...*/ |
566 | return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */ | |
567 | ||
dd2155a4 DM |
568 | return off; |
569 | } | |
570 | ||
571 | ||
572 | ||
573 | /* | |
574 | =for apidoc pad_findlex | |
575 | ||
576 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
a3985cdc DM |
577 | in the inner pads if it's found in an outer one. innercv is the CV *inside* |
578 | the chain of outer CVs to be searched. If newoff is non-null, this is a | |
579 | run-time cloning: don't add fake entries, just find the lexical and add a | |
580 | ref to it at newoff in the current pad. | |
dd2155a4 DM |
581 | |
582 | =cut | |
583 | */ | |
584 | ||
dd2155a4 | 585 | STATIC PADOFFSET |
a3985cdc | 586 | S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, CV* innercv) |
dd2155a4 DM |
587 | { |
588 | CV *cv; | |
ee6cee0c | 589 | I32 off = 0; |
dd2155a4 | 590 | SV *sv; |
a3985cdc DM |
591 | CV* startcv; |
592 | U32 seq; | |
ee6cee0c DM |
593 | I32 depth; |
594 | AV *oldpad; | |
595 | SV *oldsv; | |
596 | AV *curlist; | |
dd2155a4 | 597 | |
f3548bdc | 598 | ASSERT_CURPAD_ACTIVE("pad_findlex"); |
dd2155a4 | 599 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
a3985cdc DM |
600 | "Pad findlex: \"%s\" off=%ld startcv=0x%"UVxf"\n", |
601 | name, (long)newoff, PTR2UV(innercv)) | |
dd2155a4 DM |
602 | ); |
603 | ||
a3985cdc DM |
604 | seq = CvOUTSIDE_SEQ(innercv); |
605 | startcv = CvOUTSIDE(innercv); | |
606 | ||
607 | for (cv = startcv; cv; seq = CvOUTSIDE_SEQ(cv), cv = CvOUTSIDE(cv)) { | |
ee6cee0c | 608 | SV **svp; |
dd2155a4 | 609 | AV *curname; |
ee6cee0c | 610 | I32 fake_off = 0; |
dd2155a4 DM |
611 | |
612 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
a3985cdc DM |
613 | " searching: cv=0x%"UVxf" seq=%d\n", |
614 | PTR2UV(cv), (int) seq ) | |
dd2155a4 DM |
615 | ); |
616 | ||
ee6cee0c | 617 | curlist = CvPADLIST(cv); |
7dafbf52 DM |
618 | if (!curlist) |
619 | continue; /* an undef CV */ | |
ee6cee0c | 620 | svp = av_fetch(curlist, 0, FALSE); |
dd2155a4 DM |
621 | if (!svp || *svp == &PL_sv_undef) |
622 | continue; | |
623 | curname = (AV*)*svp; | |
624 | svp = AvARRAY(curname); | |
ee6cee0c DM |
625 | |
626 | depth = CvDEPTH(cv); | |
dd2155a4 | 627 | for (off = AvFILLp(curname); off > 0; off--) { |
ee6cee0c DM |
628 | sv = svp[off]; |
629 | if (!sv || sv == &PL_sv_undef || !strEQ(SvPVX(sv), name)) | |
630 | continue; | |
631 | if (SvFAKE(sv)) { | |
632 | /* we'll use this later if we don't find a real entry */ | |
633 | fake_off = off; | |
dd2155a4 | 634 | continue; |
dd2155a4 | 635 | } |
ee6cee0c DM |
636 | else { |
637 | if ( seq > (U32)I_32(SvNVX(sv)) /* min */ | |
638 | && seq <= (U32)SvIVX(sv) /* max */ | |
639 | && !(newoff && !depth) /* ignore inactive when cloning */ | |
640 | ) | |
641 | goto found; | |
642 | } | |
643 | } | |
644 | ||
645 | /* no real entry - but did we find a fake one? */ | |
646 | if (fake_off) { | |
647 | if (newoff && !depth) | |
648 | return 0; /* don't clone from inactive stack frame */ | |
649 | off = fake_off; | |
650 | sv = svp[off]; | |
651 | goto found; | |
652 | } | |
653 | } | |
654 | return 0; | |
dd2155a4 | 655 | |
ee6cee0c | 656 | found: |
dd2155a4 | 657 | |
ee6cee0c DM |
658 | if (!depth) |
659 | depth = 1; | |
dd2155a4 | 660 | |
ee6cee0c DM |
661 | oldpad = (AV*)AvARRAY(curlist)[depth]; |
662 | oldsv = *av_fetch(oldpad, off, TRUE); | |
663 | ||
664 | #ifdef DEBUGGING | |
665 | if (SvFAKE(sv)) | |
666 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
667 | " matched: offset %ld" | |
668 | " FAKE, sv=0x%"UVxf"\n", | |
669 | (long)off, | |
670 | PTR2UV(oldsv) | |
671 | ) | |
672 | ); | |
673 | else | |
674 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
675 | " matched: offset %ld" | |
676 | " (%lu,%lu), sv=0x%"UVxf"\n", | |
677 | (long)off, | |
678 | (unsigned long)I_32(SvNVX(sv)), | |
679 | (unsigned long)SvIVX(sv), | |
680 | PTR2UV(oldsv) | |
681 | ) | |
682 | ); | |
683 | #endif | |
684 | ||
685 | if (!newoff) { /* Not a mere clone operation. */ | |
686 | newoff = pad_add_name( | |
687 | SvPVX(sv), | |
688 | (SvFLAGS(sv) & SVpad_TYPED) ? SvSTASH(sv) : Nullhv, | |
689 | (SvFLAGS(sv) & SVpad_OUR) ? GvSTASH(sv) : Nullhv, | |
690 | 1 /* fake */ | |
691 | ); | |
dd2155a4 | 692 | |
ee6cee0c DM |
693 | if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) { |
694 | /* "It's closures all the way down." */ | |
695 | CvCLONE_on(PL_compcv); | |
696 | if (cv == startcv) { | |
697 | if (CvANON(PL_compcv)) | |
698 | oldsv = Nullsv; /* no need to keep ref */ | |
699 | } | |
700 | else { | |
701 | CV *bcv; | |
702 | for (bcv = startcv; | |
703 | bcv && bcv != cv && !CvCLONE(bcv); | |
704 | bcv = CvOUTSIDE(bcv)) | |
705 | { | |
706 | if (CvANON(bcv)) { | |
707 | /* install the missing pad entry in intervening | |
708 | * nested subs and mark them cloneable. */ | |
709 | AV *ocomppad_name = PL_comppad_name; | |
710 | PAD *ocomppad = PL_comppad; | |
711 | AV *padlist = CvPADLIST(bcv); | |
712 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; | |
713 | PL_comppad = (AV*)AvARRAY(padlist)[1]; | |
714 | PL_curpad = AvARRAY(PL_comppad); | |
715 | pad_add_name( | |
716 | SvPVX(sv), | |
717 | (SvFLAGS(sv) & SVpad_TYPED) | |
718 | ? SvSTASH(sv) : Nullhv, | |
719 | (SvFLAGS(sv) & SVpad_OUR) | |
720 | ? GvSTASH(sv) : Nullhv, | |
721 | 1 /* fake */ | |
722 | ); | |
723 | ||
724 | PL_comppad_name = ocomppad_name; | |
725 | PL_comppad = ocomppad; | |
726 | PL_curpad = ocomppad ? | |
727 | AvARRAY(ocomppad) : Null(SV **); | |
728 | CvCLONE_on(bcv); | |
dd2155a4 DM |
729 | } |
730 | else { | |
ee6cee0c DM |
731 | if (ckWARN(WARN_CLOSURE) |
732 | && !CvUNIQUE(bcv) && !CvUNIQUE(cv)) | |
dd2155a4 | 733 | { |
ee6cee0c DM |
734 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
735 | "Variable \"%s\" may be unavailable", | |
736 | name); | |
dd2155a4 | 737 | } |
ee6cee0c | 738 | break; |
dd2155a4 DM |
739 | } |
740 | } | |
741 | } | |
ee6cee0c DM |
742 | } |
743 | else if (!CvUNIQUE(PL_compcv)) { | |
744 | if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv) | |
745 | && !(SvFLAGS(sv) & SVpad_OUR)) | |
746 | { | |
747 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
748 | "Variable \"%s\" will not stay shared", name); | |
749 | } | |
dd2155a4 DM |
750 | } |
751 | } | |
ee6cee0c DM |
752 | av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv)); |
753 | ASSERT_CURPAD_ACTIVE("pad_findlex 2"); | |
754 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
755 | "Pad findlex: set offset %ld to sv 0x%"UVxf"\n", | |
756 | (long)newoff, PTR2UV(oldsv) | |
757 | ) | |
758 | ); | |
759 | return newoff; | |
dd2155a4 DM |
760 | } |
761 | ||
762 | ||
763 | /* | |
764 | =for apidoc pad_sv | |
765 | ||
766 | Get the value at offset po in the current pad. | |
767 | Use macro PAD_SV instead of calling this function directly. | |
768 | ||
769 | =cut | |
770 | */ | |
771 | ||
772 | ||
773 | SV * | |
774 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
775 | { | |
f3548bdc | 776 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 | 777 | |
dd2155a4 DM |
778 | if (!po) |
779 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
780 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
781 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 782 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 DM |
783 | ); |
784 | return PL_curpad[po]; | |
785 | } | |
786 | ||
787 | ||
788 | /* | |
789 | =for apidoc pad_setsv | |
790 | ||
791 | Set the entry at offset po in the current pad to sv. | |
792 | Use the macro PAD_SETSV() rather than calling this function directly. | |
793 | ||
794 | =cut | |
795 | */ | |
796 | ||
797 | #ifdef DEBUGGING | |
798 | void | |
799 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
800 | { | |
f3548bdc | 801 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 DM |
802 | |
803 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
804 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 805 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 DM |
806 | ); |
807 | PL_curpad[po] = sv; | |
808 | } | |
809 | #endif | |
810 | ||
811 | ||
812 | ||
813 | /* | |
814 | =for apidoc pad_block_start | |
815 | ||
816 | Update the pad compilation state variables on entry to a new block | |
817 | ||
818 | =cut | |
819 | */ | |
820 | ||
821 | /* XXX DAPM perhaps: | |
822 | * - integrate this in general state-saving routine ??? | |
823 | * - combine with the state-saving going on in pad_new ??? | |
824 | * - introduce a new SAVE type that does all this in one go ? | |
825 | */ | |
826 | ||
827 | void | |
828 | Perl_pad_block_start(pTHX_ int full) | |
829 | { | |
f3548bdc | 830 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 DM |
831 | SAVEI32(PL_comppad_name_floor); |
832 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
833 | if (full) | |
834 | PL_comppad_name_fill = PL_comppad_name_floor; | |
835 | if (PL_comppad_name_floor < 0) | |
836 | PL_comppad_name_floor = 0; | |
837 | SAVEI32(PL_min_intro_pending); | |
838 | SAVEI32(PL_max_intro_pending); | |
839 | PL_min_intro_pending = 0; | |
840 | SAVEI32(PL_comppad_name_fill); | |
841 | SAVEI32(PL_padix_floor); | |
842 | PL_padix_floor = PL_padix; | |
843 | PL_pad_reset_pending = FALSE; | |
844 | } | |
845 | ||
846 | ||
847 | /* | |
848 | =for apidoc intro_my | |
849 | ||
850 | "Introduce" my variables to visible status. | |
851 | ||
852 | =cut | |
853 | */ | |
854 | ||
855 | U32 | |
856 | Perl_intro_my(pTHX) | |
857 | { | |
858 | SV **svp; | |
859 | SV *sv; | |
860 | I32 i; | |
861 | ||
f3548bdc | 862 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 DM |
863 | if (! PL_min_intro_pending) |
864 | return PL_cop_seqmax; | |
865 | ||
866 | svp = AvARRAY(PL_comppad_name); | |
867 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
ee6cee0c DM |
868 | if ((sv = svp[i]) && sv != &PL_sv_undef |
869 | && !SvFAKE(sv) && !SvIVX(sv)) | |
870 | { | |
dd2155a4 DM |
871 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ |
872 | SvNVX(sv) = (NV)PL_cop_seqmax; | |
873 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
874 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", | |
875 | (long)i, SvPVX(sv), | |
876 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) | |
877 | ); | |
878 | } | |
879 | } | |
880 | PL_min_intro_pending = 0; | |
881 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
882 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
883 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
884 | ||
885 | return PL_cop_seqmax++; | |
886 | } | |
887 | ||
888 | /* | |
889 | =for apidoc pad_leavemy | |
890 | ||
891 | Cleanup at end of scope during compilation: set the max seq number for | |
892 | lexicals in this scope and warn of any lexicals that never got introduced. | |
893 | ||
894 | =cut | |
895 | */ | |
896 | ||
897 | void | |
898 | Perl_pad_leavemy(pTHX) | |
899 | { | |
900 | I32 off; | |
901 | SV **svp = AvARRAY(PL_comppad_name); | |
902 | SV *sv; | |
903 | ||
904 | PL_pad_reset_pending = FALSE; | |
905 | ||
f3548bdc | 906 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 DM |
907 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
908 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
ee6cee0c DM |
909 | if ((sv = svp[off]) && sv != &PL_sv_undef |
910 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) | |
dd2155a4 | 911 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
35c1215d | 912 | "%"SVf" never introduced", sv); |
dd2155a4 DM |
913 | } |
914 | } | |
915 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
916 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
ee6cee0c DM |
917 | if ((sv = svp[off]) && sv != &PL_sv_undef |
918 | && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) | |
919 | { | |
dd2155a4 DM |
920 | SvIVX(sv) = PL_cop_seqmax; |
921 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
922 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", | |
923 | (long)off, SvPVX(sv), | |
924 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) | |
925 | ); | |
926 | } | |
927 | } | |
928 | PL_cop_seqmax++; | |
929 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
930 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
931 | } | |
932 | ||
933 | ||
934 | /* | |
935 | =for apidoc pad_swipe | |
936 | ||
937 | Abandon the tmp in the current pad at offset po and replace with a | |
938 | new one. | |
939 | ||
940 | =cut | |
941 | */ | |
942 | ||
943 | void | |
944 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
945 | { | |
f3548bdc | 946 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 DM |
947 | if (!PL_curpad) |
948 | return; | |
949 | if (AvARRAY(PL_comppad) != PL_curpad) | |
950 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
951 | if (!po) | |
952 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
953 | ||
954 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
955 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
956 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
957 | ||
958 | if (PL_curpad[po]) | |
959 | SvPADTMP_off(PL_curpad[po]); | |
960 | if (refadjust) | |
961 | SvREFCNT_dec(PL_curpad[po]); | |
962 | ||
963 | PL_curpad[po] = NEWSV(1107,0); | |
964 | SvPADTMP_on(PL_curpad[po]); | |
965 | if ((I32)po < PL_padix) | |
966 | PL_padix = po - 1; | |
967 | } | |
968 | ||
969 | ||
970 | /* | |
971 | =for apidoc pad_reset | |
972 | ||
973 | Mark all the current temporaries for reuse | |
974 | ||
975 | =cut | |
976 | */ | |
977 | ||
978 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
979 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
980 | * on the stack by OPs that use them, there are several ways to get an alias | |
981 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
982 | * We avoid doing this until we can think of a Better Way. | |
983 | * GSAR 97-10-29 */ | |
984 | void | |
985 | Perl_pad_reset(pTHX) | |
986 | { | |
987 | #ifdef USE_BROKEN_PAD_RESET | |
988 | register I32 po; | |
989 | ||
990 | if (AvARRAY(PL_comppad) != PL_curpad) | |
991 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
992 | ||
993 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
994 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
995 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
996 | (long)PL_padix, (long)PL_padix_floor | |
997 | ) | |
998 | ); | |
999 | ||
1000 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
1001 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { | |
1002 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1003 | SvPADTMP_off(PL_curpad[po]); | |
1004 | } | |
1005 | PL_padix = PL_padix_floor; | |
1006 | } | |
1007 | #endif | |
1008 | PL_pad_reset_pending = FALSE; | |
1009 | } | |
1010 | ||
1011 | ||
1012 | /* | |
1013 | =for apidoc pad_tidy | |
1014 | ||
1015 | Tidy up a pad after we've finished compiling it: | |
1016 | * remove most stuff from the pads of anonsub prototypes; | |
1017 | * give it a @_; | |
1018 | * mark tmps as such. | |
1019 | ||
1020 | =cut | |
1021 | */ | |
1022 | ||
1023 | /* XXX DAPM surely most of this stuff should be done properly | |
1024 | * at the right time beforehand, rather than going around afterwards | |
1025 | * cleaning up our mistakes ??? | |
1026 | */ | |
1027 | ||
1028 | void | |
1029 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1030 | { | |
1031 | PADOFFSET ix; | |
1032 | ||
f3548bdc | 1033 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
dd2155a4 DM |
1034 | /* extend curpad to match namepad */ |
1035 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
1036 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); | |
1037 | ||
1038 | if (type == padtidy_SUBCLONE) { | |
1039 | SV **namep = AvARRAY(PL_comppad_name); | |
1040 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1041 | SV *namesv; | |
1042 | ||
1043 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1044 | continue; | |
1045 | /* | |
1046 | * The only things that a clonable function needs in its | |
1047 | * pad are references to outer lexicals and anonymous subs. | |
1048 | * The rest are created anew during cloning. | |
1049 | */ | |
1050 | if (!((namesv = namep[ix]) != Nullsv && | |
1051 | namesv != &PL_sv_undef && | |
1052 | (SvFAKE(namesv) || | |
1053 | *SvPVX(namesv) == '&'))) | |
1054 | { | |
1055 | SvREFCNT_dec(PL_curpad[ix]); | |
1056 | PL_curpad[ix] = Nullsv; | |
1057 | } | |
1058 | } | |
1059 | } | |
1060 | else if (type == padtidy_SUB) { | |
1061 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
1062 | AV *av = newAV(); /* Will be @_ */ | |
1063 | av_extend(av, 0); | |
1064 | av_store(PL_comppad, 0, (SV*)av); | |
1065 | AvFLAGS(av) = AVf_REIFY; | |
1066 | } | |
1067 | ||
1068 | /* XXX DAPM rationalise these two similar branches */ | |
1069 | ||
1070 | if (type == padtidy_SUB) { | |
1071 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1072 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1073 | continue; | |
1074 | if (!SvPADMY(PL_curpad[ix])) | |
1075 | SvPADTMP_on(PL_curpad[ix]); | |
1076 | } | |
1077 | } | |
1078 | else if (type == padtidy_FORMAT) { | |
1079 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1080 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) | |
1081 | SvPADTMP_on(PL_curpad[ix]); | |
1082 | } | |
1083 | } | |
f3548bdc | 1084 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 DM |
1085 | } |
1086 | ||
1087 | ||
1088 | /* | |
1089 | =for apidoc pad_free | |
1090 | ||
1091 | Free the SV at offet po in the current pad. | |
1092 | ||
1093 | =cut | |
1094 | */ | |
1095 | ||
1096 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1097 | void | |
1098 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1099 | { | |
f3548bdc | 1100 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 DM |
1101 | if (!PL_curpad) |
1102 | return; | |
1103 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1104 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1105 | if (!po) | |
1106 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1107 | ||
1108 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1109 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1110 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1111 | ); | |
1112 | ||
1113 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1114 | SvPADTMP_off(PL_curpad[po]); | |
1115 | #ifdef USE_ITHREADS | |
7e736055 HS |
1116 | /* SV could be a shared hash key (eg bugid #19022) */ |
1117 | if ( | |
dd2155a4 | 1118 | #ifdef PERL_COPY_ON_WRITE |
7e736055 HS |
1119 | !SvIsCOW(PL_curpad[po]) |
1120 | #else | |
1121 | !SvFAKE(PL_curpad[po]) | |
dd2155a4 | 1122 | #endif |
7e736055 | 1123 | ) |
dd2155a4 | 1124 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 DM |
1125 | #endif |
1126 | } | |
1127 | if ((I32)po < PL_padix) | |
1128 | PL_padix = po - 1; | |
1129 | } | |
1130 | ||
1131 | ||
1132 | ||
1133 | /* | |
1134 | =for apidoc do_dump_pad | |
1135 | ||
1136 | Dump the contents of a padlist | |
1137 | ||
1138 | =cut | |
1139 | */ | |
1140 | ||
1141 | void | |
1142 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1143 | { | |
1144 | AV *pad_name; | |
1145 | AV *pad; | |
1146 | SV **pname; | |
1147 | SV **ppad; | |
1148 | SV *namesv; | |
1149 | I32 ix; | |
1150 | ||
1151 | if (!padlist) { | |
1152 | return; | |
1153 | } | |
1154 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); | |
1155 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); | |
1156 | pname = AvARRAY(pad_name); | |
1157 | ppad = AvARRAY(pad); | |
1158 | Perl_dump_indent(aTHX_ level, file, | |
1159 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1160 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1161 | ); | |
1162 | ||
1163 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
1164 | namesv = pname[ix]; | |
1165 | if (namesv && namesv == &PL_sv_undef) { | |
1166 | namesv = Nullsv; | |
1167 | } | |
1168 | if (namesv) { | |
ee6cee0c DM |
1169 | if (SvFAKE(namesv)) |
1170 | Perl_dump_indent(aTHX_ level+1, file, | |
e9d09c08 | 1171 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\"\n", |
ee6cee0c DM |
1172 | (int) ix, |
1173 | PTR2UV(ppad[ix]), | |
1174 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
e9d09c08 | 1175 | SvPVX(namesv) |
ee6cee0c DM |
1176 | ); |
1177 | else | |
1178 | Perl_dump_indent(aTHX_ level+1, file, | |
e9d09c08 | 1179 | "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n", |
ee6cee0c DM |
1180 | (int) ix, |
1181 | PTR2UV(ppad[ix]), | |
1182 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
1183 | (unsigned long)I_32(SvNVX(namesv)), | |
1184 | (unsigned long)SvIVX(namesv), | |
e9d09c08 | 1185 | SvPVX(namesv) |
ee6cee0c | 1186 | ); |
dd2155a4 DM |
1187 | } |
1188 | else if (full) { | |
1189 | Perl_dump_indent(aTHX_ level+1, file, | |
1190 | "%2d. 0x%"UVxf"<%lu>\n", | |
1191 | (int) ix, | |
1192 | PTR2UV(ppad[ix]), | |
1193 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1194 | ); | |
1195 | } | |
1196 | } | |
1197 | } | |
1198 | ||
1199 | ||
1200 | ||
1201 | /* | |
1202 | =for apidoc cv_dump | |
1203 | ||
1204 | dump the contents of a CV | |
1205 | ||
1206 | =cut | |
1207 | */ | |
1208 | ||
1209 | #ifdef DEBUGGING | |
1210 | STATIC void | |
1211 | S_cv_dump(pTHX_ CV *cv, char *title) | |
1212 | { | |
1213 | CV *outside = CvOUTSIDE(cv); | |
1214 | AV* padlist = CvPADLIST(cv); | |
1215 | ||
1216 | PerlIO_printf(Perl_debug_log, | |
1217 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1218 | title, | |
1219 | PTR2UV(cv), | |
1220 | (CvANON(cv) ? "ANON" | |
1221 | : (cv == PL_main_cv) ? "MAIN" | |
1222 | : CvUNIQUE(cv) ? "UNIQUE" | |
1223 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1224 | PTR2UV(outside), | |
1225 | (!outside ? "null" | |
1226 | : CvANON(outside) ? "ANON" | |
1227 | : (outside == PL_main_cv) ? "MAIN" | |
1228 | : CvUNIQUE(outside) ? "UNIQUE" | |
1229 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1230 | ||
1231 | PerlIO_printf(Perl_debug_log, | |
1232 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1233 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1234 | } | |
1235 | #endif /* DEBUGGING */ | |
1236 | ||
1237 | ||
1238 | ||
1239 | ||
1240 | ||
1241 | /* | |
1242 | =for apidoc cv_clone | |
1243 | ||
1244 | Clone a CV: make a new CV which points to the same code etc, but which | |
1245 | has a newly-created pad built by copying the prototype pad and capturing | |
1246 | any outer lexicals. | |
1247 | ||
1248 | =cut | |
1249 | */ | |
1250 | ||
1251 | CV * | |
1252 | Perl_cv_clone(pTHX_ CV *proto) | |
1253 | { | |
1254 | CV *cv; | |
1255 | ||
1256 | LOCK_CRED_MUTEX; /* XXX create separate mutex */ | |
1257 | cv = cv_clone2(proto, CvOUTSIDE(proto)); | |
1258 | UNLOCK_CRED_MUTEX; /* XXX create separate mutex */ | |
1259 | return cv; | |
1260 | } | |
1261 | ||
1262 | ||
1263 | /* XXX DAPM separate out cv and paddish bits ??? | |
1264 | * ideally the CV-related stuff shouldn't be in pad.c - how about | |
1265 | * a cv.c? */ | |
1266 | ||
1267 | STATIC CV * | |
1268 | S_cv_clone2(pTHX_ CV *proto, CV *outside) | |
1269 | { | |
1270 | I32 ix; | |
1271 | AV* protopadlist = CvPADLIST(proto); | |
1272 | AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); | |
1273 | AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); | |
1274 | SV** pname = AvARRAY(protopad_name); | |
1275 | SV** ppad = AvARRAY(protopad); | |
1276 | I32 fname = AvFILLp(protopad_name); | |
1277 | I32 fpad = AvFILLp(protopad); | |
1278 | AV* comppadlist; | |
1279 | CV* cv; | |
1280 | ||
1281 | assert(!CvUNIQUE(proto)); | |
1282 | ||
1283 | ENTER; | |
1284 | SAVESPTR(PL_compcv); | |
1285 | ||
1286 | cv = PL_compcv = (CV*)NEWSV(1104, 0); | |
1287 | sv_upgrade((SV *)cv, SvTYPE(proto)); | |
7dafbf52 | 1288 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 DM |
1289 | CvCLONED_on(cv); |
1290 | ||
dd2155a4 DM |
1291 | #ifdef USE_ITHREADS |
1292 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) | |
1293 | : savepv(CvFILE(proto)); | |
1294 | #else | |
1295 | CvFILE(cv) = CvFILE(proto); | |
1296 | #endif | |
1297 | CvGV(cv) = CvGV(proto); | |
1298 | CvSTASH(cv) = CvSTASH(proto); | |
1299 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); | |
1300 | CvSTART(cv) = CvSTART(proto); | |
a3985cdc | 1301 | if (outside) { |
dd2155a4 | 1302 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
a3985cdc DM |
1303 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
1304 | } | |
dd2155a4 DM |
1305 | |
1306 | if (SvPOK(proto)) | |
1307 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); | |
1308 | ||
1309 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); | |
1310 | ||
1311 | for (ix = fname; ix >= 0; ix--) | |
1312 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1313 | ||
1314 | av_fill(PL_comppad, fpad); | |
1315 | PL_curpad = AvARRAY(PL_comppad); | |
1316 | ||
1317 | for (ix = fpad; ix > 0; ix--) { | |
1318 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; | |
1319 | if (namesv && namesv != &PL_sv_undef) { | |
1320 | char *name = SvPVX(namesv); /* XXX */ | |
1321 | if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */ | |
a3985cdc | 1322 | I32 off = pad_findlex(name, ix, cv); |
dd2155a4 DM |
1323 | if (!off) |
1324 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); | |
1325 | else if (off != ix) | |
1326 | Perl_croak(aTHX_ "panic: cv_clone: %s", name); | |
1327 | } | |
1328 | else { /* our own lexical */ | |
1329 | SV* sv; | |
1330 | if (*name == '&') { | |
1331 | /* anon code -- we'll come back for it */ | |
1332 | sv = SvREFCNT_inc(ppad[ix]); | |
1333 | } | |
1334 | else if (*name == '@') | |
1335 | sv = (SV*)newAV(); | |
1336 | else if (*name == '%') | |
1337 | sv = (SV*)newHV(); | |
1338 | else | |
1339 | sv = NEWSV(0, 0); | |
235cc2e3 | 1340 | SvPADMY_on(sv); |
dd2155a4 DM |
1341 | PL_curpad[ix] = sv; |
1342 | } | |
1343 | } | |
1344 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
1345 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); | |
1346 | } | |
1347 | else { | |
1348 | SV* sv = NEWSV(0, 0); | |
1349 | SvPADTMP_on(sv); | |
1350 | PL_curpad[ix] = sv; | |
1351 | } | |
1352 | } | |
1353 | ||
1354 | /* Now that vars are all in place, clone nested closures. */ | |
1355 | ||
1356 | for (ix = fpad; ix > 0; ix--) { | |
1357 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; | |
1358 | if (namesv | |
1359 | && namesv != &PL_sv_undef | |
1360 | && !(SvFLAGS(namesv) & SVf_FAKE) | |
1361 | && *SvPVX(namesv) == '&' | |
1362 | && CvCLONE(ppad[ix])) | |
1363 | { | |
1364 | CV *kid = cv_clone2((CV*)ppad[ix], cv); | |
1365 | SvREFCNT_dec(ppad[ix]); | |
1366 | CvCLONE_on(kid); | |
1367 | SvPADMY_on(kid); | |
1368 | PL_curpad[ix] = (SV*)kid; | |
7dafbf52 DM |
1369 | /* '&' entry points to child, so child mustn't refcnt parent */ |
1370 | CvWEAKOUTSIDE_on(kid); | |
1371 | SvREFCNT_dec(cv); | |
dd2155a4 DM |
1372 | } |
1373 | } | |
1374 | ||
1375 | DEBUG_Xv( | |
1376 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1377 | cv_dump(outside, "Outside"); | |
1378 | cv_dump(proto, "Proto"); | |
1379 | cv_dump(cv, "To"); | |
1380 | ); | |
1381 | ||
1382 | LEAVE; | |
1383 | ||
1384 | if (CvCONST(cv)) { | |
1385 | SV* const_sv = op_const_sv(CvSTART(cv), cv); | |
1386 | assert(const_sv); | |
1387 | /* constant sub () { $x } closing over $x - see lib/constant.pm */ | |
1388 | SvREFCNT_dec(cv); | |
1389 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); | |
1390 | } | |
1391 | ||
1392 | return cv; | |
1393 | } | |
1394 | ||
1395 | ||
1396 | /* | |
1397 | =for apidoc pad_fixup_inner_anons | |
1398 | ||
1399 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
7dafbf52 DM |
1400 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1401 | moved to a pre-existing CV struct. | |
dd2155a4 DM |
1402 | |
1403 | =cut | |
1404 | */ | |
1405 | ||
1406 | void | |
1407 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1408 | { | |
1409 | I32 ix; | |
1410 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; | |
1411 | AV *comppad = (AV*)AvARRAY(padlist)[1]; | |
1412 | SV **namepad = AvARRAY(comppad_name); | |
1413 | SV **curpad = AvARRAY(comppad); | |
1414 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { | |
1415 | SV *namesv = namepad[ix]; | |
1416 | if (namesv && namesv != &PL_sv_undef | |
1417 | && *SvPVX(namesv) == '&') | |
1418 | { | |
1419 | CV *innercv = (CV*)curpad[ix]; | |
7dafbf52 DM |
1420 | assert(CvWEAKOUTSIDE(innercv)); |
1421 | assert(CvOUTSIDE(innercv) == old_cv); | |
1422 | CvOUTSIDE(innercv) = new_cv; | |
dd2155a4 DM |
1423 | } |
1424 | } | |
1425 | } | |
1426 | ||
7dafbf52 | 1427 | |
dd2155a4 DM |
1428 | /* |
1429 | =for apidoc pad_push | |
1430 | ||
1431 | Push a new pad frame onto the padlist, unless there's already a pad at | |
1432 | this depth, in which case don't bother creating a new one. | |
1433 | If has_args is true, give the new pad an @_ in slot zero. | |
1434 | ||
1435 | =cut | |
1436 | */ | |
1437 | ||
1438 | void | |
1439 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) | |
1440 | { | |
1441 | if (depth <= AvFILLp(padlist)) | |
1442 | return; | |
1443 | ||
1444 | { | |
1445 | SV** svp = AvARRAY(padlist); | |
1446 | AV *newpad = newAV(); | |
1447 | SV **oldpad = AvARRAY(svp[depth-1]); | |
1448 | I32 ix = AvFILLp((AV*)svp[1]); | |
1449 | I32 names_fill = AvFILLp((AV*)svp[0]); | |
1450 | SV** names = AvARRAY(svp[0]); | |
1451 | SV* sv; | |
1452 | for ( ;ix > 0; ix--) { | |
1453 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
1454 | char *name = SvPVX(names[ix]); | |
1455 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || *name == '&') { | |
1456 | /* outer lexical or anon code */ | |
1457 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1458 | } | |
1459 | else { /* our own lexical */ | |
1460 | if (*name == '@') | |
1461 | av_store(newpad, ix, sv = (SV*)newAV()); | |
1462 | else if (*name == '%') | |
1463 | av_store(newpad, ix, sv = (SV*)newHV()); | |
1464 | else | |
1465 | av_store(newpad, ix, sv = NEWSV(0, 0)); | |
1466 | SvPADMY_on(sv); | |
1467 | } | |
1468 | } | |
1469 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
1470 | av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix])); | |
1471 | } | |
1472 | else { | |
1473 | /* save temporaries on recursion? */ | |
1474 | av_store(newpad, ix, sv = NEWSV(0, 0)); | |
1475 | SvPADTMP_on(sv); | |
1476 | } | |
1477 | } | |
1478 | if (has_args) { | |
1479 | AV* av = newAV(); | |
1480 | av_extend(av, 0); | |
1481 | av_store(newpad, 0, (SV*)av); | |
1482 | AvFLAGS(av) = AVf_REIFY; | |
1483 | } | |
1484 | av_store(padlist, depth, (SV*)newpad); | |
1485 | AvFILLp(padlist) = depth; | |
1486 | } | |
1487 | } |