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dd2155a4 |
1 | /* pad.c |
2 | * |
3 | * Copyright (c) 2002, Larry Wall |
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 |
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: |
49 | C<PL_comppad_name> is set the the the names AV. |
50 | C<PL_comppad> is set the the frame AV for the frame CvDEPTH == 1. |
51 | C<PL_curpad> is set the body of the frame AV (i.e. AvARRAY(PL_comppad)). |
52 | |
f3548bdc |
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 |
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 |
77 | a REFCNT'ed references to a lexical from "outside". |
78 | |
79 | If the 'name' is '&' the the corresponding entry in frame AV |
80 | is a CV representing a possible closure. |
81 | (SvFAKE and name of '&' is not a meaningful combination currently but could |
82 | become so if C<my sub foo {}> is implemented.) |
83 | |
84 | =cut |
85 | */ |
86 | |
87 | |
88 | #include "EXTERN.h" |
89 | #define PERL_IN_PAD_C |
90 | #include "perl.h" |
91 | |
92 | |
93 | #define PAD_MAX 999999999 |
94 | |
95 | |
96 | |
97 | /* |
98 | =for apidoc pad_new |
99 | |
100 | Create a new compiling padlist, saving and updating the various global |
101 | vars at the same time as creating the pad itself. The following flags |
102 | can be OR'ed together: |
103 | |
104 | padnew_CLONE this pad is for a cloned CV |
105 | padnew_SAVE save old globals |
106 | padnew_SAVESUB also save extra stuff for start of sub |
107 | |
108 | =cut |
109 | */ |
110 | |
111 | PADLIST * |
112 | Perl_pad_new(pTHX_ padnew_flags flags) |
113 | { |
114 | AV *padlist, *padname, *pad, *a0; |
115 | |
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116 | ASSERT_CURPAD_LEGAL("pad_new"); |
117 | |
dd2155a4 |
118 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
119 | * vars (based on flags) rather than storing vals + addresses for |
120 | * each individually. Also see pad_block_start. |
121 | * XXX DAPM Try to see whether all these conditionals are required |
122 | */ |
123 | |
124 | /* save existing state, ... */ |
125 | |
126 | if (flags & padnew_SAVE) { |
3979c56f |
127 | SAVECOMPPAD(); |
dd2155a4 |
128 | SAVESPTR(PL_comppad_name); |
129 | if (! (flags & padnew_CLONE)) { |
130 | SAVEI32(PL_padix); |
131 | SAVEI32(PL_comppad_name_fill); |
132 | SAVEI32(PL_min_intro_pending); |
133 | SAVEI32(PL_max_intro_pending); |
134 | if (flags & padnew_SAVESUB) { |
135 | SAVEI32(PL_pad_reset_pending); |
136 | } |
137 | } |
138 | } |
139 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be |
140 | * saved - check at some pt that this is okay */ |
141 | |
142 | /* ... create new pad ... */ |
143 | |
144 | padlist = newAV(); |
145 | padname = newAV(); |
146 | pad = newAV(); |
147 | |
148 | if (flags & padnew_CLONE) { |
149 | /* XXX DAPM I dont know why cv_clone needs it |
150 | * doing differently yet - perhaps this separate branch can be |
151 | * dispensed with eventually ??? |
152 | */ |
153 | |
154 | a0 = newAV(); /* will be @_ */ |
155 | av_extend(a0, 0); |
156 | av_store(pad, 0, (SV*)a0); |
157 | AvFLAGS(a0) = AVf_REIFY; |
158 | } |
159 | else { |
dd2155a4 |
160 | av_store(pad, 0, Nullsv); |
dd2155a4 |
161 | } |
162 | |
163 | AvREAL_off(padlist); |
164 | av_store(padlist, 0, (SV*)padname); |
165 | av_store(padlist, 1, (SV*)pad); |
166 | |
167 | /* ... then update state variables */ |
168 | |
169 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); |
170 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); |
171 | PL_curpad = AvARRAY(PL_comppad); |
172 | |
173 | if (! (flags & padnew_CLONE)) { |
174 | PL_comppad_name_fill = 0; |
175 | PL_min_intro_pending = 0; |
176 | PL_padix = 0; |
177 | } |
178 | |
179 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
180 | "Pad 0x%"UVxf"[0x%"UVxf"] new: padlist=0x%"UVxf |
181 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
182 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(padlist), |
183 | PTR2UV(padname), (UV)flags |
184 | ) |
185 | ); |
186 | |
187 | return (PADLIST*)padlist; |
188 | } |
189 | |
190 | /* |
191 | =for apidoc pad_undef |
192 | |
193 | Free the padlist associated with a CV. |
194 | If parts of it happen to be current, we null the relevant |
195 | PL_*pad* global vars so that we don't have any dangling references left. |
196 | We also repoint the CvOUTSIDE of any about-to-be-orphaned |
197 | inner subs to outercv. |
198 | |
199 | =cut |
200 | */ |
201 | |
202 | void |
203 | Perl_pad_undef(pTHX_ CV* cv, CV* outercv) |
204 | { |
205 | I32 ix; |
206 | PADLIST *padlist = CvPADLIST(cv); |
207 | |
208 | if (!padlist) |
209 | return; |
210 | if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */ |
211 | return; |
212 | |
213 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
214 | "Pad undef: padlist=0x%"UVxf"\n" , PTR2UV(padlist)) |
215 | ); |
216 | |
217 | /* pads may be cleared out already during global destruction */ |
218 | if ((CvEVAL(cv) && !CvGV(cv) /* is this eval"" ? */ |
219 | && !PL_dirty) || CvSPECIAL(cv)) |
220 | { |
221 | /* XXX DAPM the following code is very similar to |
222 | * pad_fixup_inner_anons(). Merge??? */ |
223 | |
224 | /* inner references to eval's cv must be fixed up */ |
225 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
226 | SV **namepad = AvARRAY(comppad_name); |
227 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
228 | SV **curpad = AvARRAY(comppad); |
229 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
230 | SV *namesv = namepad[ix]; |
231 | if (namesv && namesv != &PL_sv_undef |
232 | && *SvPVX(namesv) == '&' |
233 | && ix <= AvFILLp(comppad)) |
234 | { |
235 | CV *innercv = (CV*)curpad[ix]; |
236 | if (innercv && SvTYPE(innercv) == SVt_PVCV |
237 | && CvOUTSIDE(innercv) == cv) |
238 | { |
239 | CvOUTSIDE(innercv) = outercv; |
240 | if (!CvANON(innercv) || CvCLONED(innercv)) { |
241 | (void)SvREFCNT_inc(outercv); |
242 | if (SvREFCNT(cv)) |
243 | SvREFCNT_dec(cv); |
244 | } |
245 | } |
246 | } |
247 | } |
248 | } |
249 | ix = AvFILLp(padlist); |
250 | while (ix >= 0) { |
251 | SV* sv = AvARRAY(padlist)[ix--]; |
252 | if (!sv) |
253 | continue; |
254 | if (sv == (SV*)PL_comppad_name) |
255 | PL_comppad_name = Nullav; |
256 | else if (sv == (SV*)PL_comppad) { |
f3548bdc |
257 | PL_comppad = Null(PAD*); |
dd2155a4 |
258 | PL_curpad = Null(SV**); |
259 | } |
260 | SvREFCNT_dec(sv); |
261 | } |
262 | SvREFCNT_dec((SV*)CvPADLIST(cv)); |
263 | CvPADLIST(cv) = Null(PADLIST*); |
264 | } |
265 | |
266 | |
267 | |
268 | |
269 | /* |
270 | =for apidoc pad_add_name |
271 | |
272 | Create a new name in the current pad at the specified offset. |
273 | If C<typestash> is valid, the name is for a typed lexical; set the |
274 | name's stash to that value. |
275 | If C<ourstash> is valid, it's an our lexical, set the name's |
276 | GvSTASH to that value |
277 | |
278 | Also, if the name is @.. or %.., create a new array or hash for that slot |
279 | |
280 | If fake, it means we're cloning an existing entry |
281 | |
282 | =cut |
283 | */ |
284 | |
285 | /* |
286 | * XXX DAPM this doesn't seem the right place to create a new array/hash. |
287 | * Whatever we do, we should be consistent - create scalars too, and |
288 | * create even if fake. Really need to integrate better the whole entry |
289 | * creation business - when + where does the name and value get created? |
290 | */ |
291 | |
292 | PADOFFSET |
293 | Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) |
294 | { |
295 | PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
296 | SV* namesv = NEWSV(1102, 0); |
297 | U32 min, max; |
298 | |
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299 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
300 | |
dd2155a4 |
301 | if (fake) { |
302 | min = PL_curcop->cop_seq; |
303 | max = PAD_MAX; |
304 | } |
305 | else { |
306 | /* not yet introduced */ |
307 | min = PAD_MAX; |
308 | max = 0; |
309 | } |
310 | |
311 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
312 | "Pad addname: %ld \"%s\", (%lu,%lu)%s\n", |
313 | (long)offset, name, (unsigned long)min, (unsigned long)max, |
314 | (fake ? " FAKE" : "") |
315 | ) |
316 | ); |
317 | |
318 | sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); |
319 | sv_setpv(namesv, name); |
320 | |
321 | if (typestash) { |
322 | SvFLAGS(namesv) |= SVpad_TYPED; |
323 | SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) typestash); |
324 | } |
325 | if (ourstash) { |
326 | SvFLAGS(namesv) |= SVpad_OUR; |
327 | GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash); |
328 | } |
329 | |
330 | av_store(PL_comppad_name, offset, namesv); |
331 | SvNVX(namesv) = (NV)min; |
332 | SvIVX(namesv) = max; |
333 | if (fake) |
334 | SvFAKE_on(namesv); |
335 | else { |
336 | if (!PL_min_intro_pending) |
337 | PL_min_intro_pending = offset; |
338 | PL_max_intro_pending = offset; |
f3548bdc |
339 | /* XXX DAPM since slot has been allocated, replace |
340 | * av_store with PL_curpad[offset] ? */ |
dd2155a4 |
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 |
374 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
375 | |
dd2155a4 |
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) { |
381 | do { |
382 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
383 | } while (SvPADBUSY(sv)); /* need a fresh one */ |
384 | retval = AvFILLp(PL_comppad); |
385 | } |
386 | else { |
387 | SV **names = AvARRAY(PL_comppad_name); |
388 | SSize_t names_fill = AvFILLp(PL_comppad_name); |
389 | for (;;) { |
390 | /* |
391 | * "foreach" index vars temporarily become aliases to non-"my" |
392 | * values. Thus we must skip, not just pad values that are |
393 | * marked as current pad values, but also those with names. |
394 | */ |
395 | /* HVDS why copy to sv here? we don't seem to use it */ |
396 | if (++PL_padix <= names_fill && |
397 | (sv = names[PL_padix]) && sv != &PL_sv_undef) |
398 | continue; |
399 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); |
400 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && |
401 | !IS_PADGV(sv) && !IS_PADCONST(sv)) |
402 | break; |
403 | } |
404 | retval = PL_padix; |
405 | } |
406 | SvFLAGS(sv) |= tmptype; |
407 | PL_curpad = AvARRAY(PL_comppad); |
408 | |
409 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
410 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", |
411 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, |
412 | PL_op_name[optype])); |
413 | return (PADOFFSET)retval; |
414 | } |
415 | |
416 | /* |
417 | =for apidoc pad_add_anon |
418 | |
419 | Add an anon code entry to the current compiling pad |
420 | |
421 | =cut |
422 | */ |
423 | |
424 | PADOFFSET |
425 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) |
426 | { |
427 | PADOFFSET ix; |
428 | SV* name; |
429 | |
430 | name = NEWSV(1106, 0); |
431 | sv_upgrade(name, SVt_PVNV); |
432 | sv_setpvn(name, "&", 1); |
433 | SvIVX(name) = -1; |
434 | SvNVX(name) = 1; |
435 | ix = pad_alloc(op_type, SVs_PADMY); |
436 | av_store(PL_comppad_name, ix, name); |
f3548bdc |
437 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 |
438 | av_store(PL_comppad, ix, sv); |
439 | SvPADMY_on(sv); |
440 | return ix; |
441 | } |
442 | |
443 | |
444 | |
445 | /* |
446 | =for apidoc pad_check_dup |
447 | |
448 | Check for duplicate declarations: report any of: |
449 | * a my in the current scope with the same name; |
450 | * an our (anywhere in the pad) with the same name and the same stash |
451 | as C<ourstash> |
452 | C<is_our> indicates that the name to check is an 'our' declaration |
453 | |
454 | =cut |
455 | */ |
456 | |
457 | /* XXX DAPM integrate this into pad_add_name ??? */ |
458 | |
459 | void |
460 | Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) |
461 | { |
462 | SV **svp, *sv; |
463 | PADOFFSET top, off; |
464 | |
f3548bdc |
465 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
dd2155a4 |
466 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) |
467 | return; /* nothing to check */ |
468 | |
469 | svp = AvARRAY(PL_comppad_name); |
470 | top = AvFILLp(PL_comppad_name); |
471 | /* check the current scope */ |
472 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same |
473 | * type ? */ |
474 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { |
475 | if ((sv = svp[off]) |
476 | && sv != &PL_sv_undef |
477 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
478 | && (!is_our |
479 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) |
480 | && strEQ(name, SvPVX(sv))) |
481 | { |
482 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
483 | "\"%s\" variable %s masks earlier declaration in same %s", |
484 | (is_our ? "our" : "my"), |
485 | name, |
486 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); |
487 | --off; |
488 | break; |
489 | } |
490 | } |
491 | /* check the rest of the pad */ |
492 | if (is_our) { |
493 | do { |
494 | if ((sv = svp[off]) |
495 | && sv != &PL_sv_undef |
496 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
497 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) |
498 | && strEQ(name, SvPVX(sv))) |
499 | { |
500 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
501 | "\"our\" variable %s redeclared", name); |
502 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
503 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); |
504 | break; |
505 | } |
506 | } while ( off-- > 0 ); |
507 | } |
508 | } |
509 | |
510 | |
511 | |
512 | /* |
513 | =for apidoc pad_findmy |
514 | |
515 | Given a lexical name, try to find its offset, first in the current pad, |
516 | or failing that, in the pads of any lexically enclosing subs (including |
517 | the complications introduced by eval). If the name is found in an outer pad, |
518 | then a fake entry is added to the current pad. |
519 | Returns the offset in the current pad, or NOT_IN_PAD on failure. |
520 | |
521 | =cut |
522 | */ |
523 | |
524 | PADOFFSET |
525 | Perl_pad_findmy(pTHX_ char *name) |
526 | { |
527 | I32 off; |
528 | I32 pendoff = 0; |
529 | SV *sv; |
530 | SV **svp = AvARRAY(PL_comppad_name); |
531 | U32 seq = PL_cop_seqmax; |
532 | PERL_CONTEXT *cx; |
533 | CV *outside; |
534 | |
f3548bdc |
535 | ASSERT_CURPAD_ACTIVE("pad_findmy"); |
dd2155a4 |
536 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad findmy: \"%s\"\n", name)); |
537 | |
dd2155a4 |
538 | /* The one we're looking for is probably just before comppad_name_fill. */ |
539 | for (off = AvFILLp(PL_comppad_name); off > 0; off--) { |
540 | if ((sv = svp[off]) && |
541 | sv != &PL_sv_undef && |
542 | (!SvIVX(sv) || |
543 | (seq <= (U32)SvIVX(sv) && |
544 | seq > (U32)I_32(SvNVX(sv)))) && |
545 | strEQ(SvPVX(sv), name)) |
546 | { |
547 | if (SvIVX(sv) || SvFLAGS(sv) & SVpad_OUR) |
548 | return (PADOFFSET)off; |
549 | pendoff = off; /* this pending def. will override import */ |
550 | } |
551 | } |
552 | |
553 | outside = CvOUTSIDE(PL_compcv); |
554 | |
555 | /* Check if if we're compiling an eval'', and adjust seq to be the |
556 | * eval's seq number. This depends on eval'' having a non-null |
557 | * CvOUTSIDE() while it is being compiled. The eval'' itself is |
558 | * identified by CvEVAL being true and CvGV being null. */ |
559 | if (outside && CvEVAL(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) { |
560 | cx = &cxstack[cxstack_ix]; |
561 | if (CxREALEVAL(cx)) |
562 | seq = cx->blk_oldcop->cop_seq; |
563 | } |
564 | |
565 | /* See if it's in a nested scope */ |
566 | off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0, 0); |
567 | if (!off) /* pad_findlex returns 0 for failure...*/ |
568 | return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */ |
569 | |
570 | /* If there is a pending local definition, this new alias must die */ |
571 | if (pendoff) |
572 | SvIVX(AvARRAY(PL_comppad_name)[off]) = seq; |
573 | return off; |
574 | } |
575 | |
576 | |
577 | |
578 | /* |
579 | =for apidoc pad_findlex |
580 | |
581 | Find a named lexical anywhere in a chain of nested pads. Add fake entries |
582 | in the inner pads if its found in an outer one. |
583 | |
584 | If flags == FINDLEX_NOSEARCH we don't bother searching outer contexts. |
585 | |
586 | =cut |
587 | */ |
588 | |
589 | #define FINDLEX_NOSEARCH 1 /* don't search outer contexts */ |
590 | |
591 | STATIC PADOFFSET |
592 | S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, U32 seq, CV* startcv, |
593 | I32 cx_ix, I32 saweval, U32 flags) |
594 | { |
595 | CV *cv; |
596 | I32 off; |
597 | SV *sv; |
598 | register I32 i; |
599 | register PERL_CONTEXT *cx; |
600 | |
f3548bdc |
601 | ASSERT_CURPAD_ACTIVE("pad_findlex"); |
dd2155a4 |
602 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
603 | "Pad findlex: \"%s\" off=%ld seq=%lu cv=0x%"UVxf |
604 | " ix=%ld saweval=%d flags=%lu\n", |
605 | name, (long)newoff, (unsigned long)seq, PTR2UV(startcv), |
606 | (long)cx_ix, (int)saweval, (unsigned long)flags |
607 | ) |
608 | ); |
609 | |
610 | for (cv = startcv; cv; cv = CvOUTSIDE(cv)) { |
611 | AV *curlist = CvPADLIST(cv); |
612 | SV **svp = av_fetch(curlist, 0, FALSE); |
613 | AV *curname; |
614 | |
615 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
616 | " searching: cv=0x%"UVxf"\n", PTR2UV(cv)) |
617 | ); |
618 | |
619 | if (!svp || *svp == &PL_sv_undef) |
620 | continue; |
621 | curname = (AV*)*svp; |
622 | svp = AvARRAY(curname); |
623 | for (off = AvFILLp(curname); off > 0; off--) { |
624 | I32 depth; |
625 | AV *oldpad; |
626 | SV *oldsv; |
627 | |
628 | if ( ! ( |
629 | (sv = svp[off]) && |
630 | sv != &PL_sv_undef && |
631 | seq <= (U32)SvIVX(sv) && |
632 | seq > (U32)I_32(SvNVX(sv)) && |
633 | strEQ(SvPVX(sv), name)) |
634 | ) |
635 | continue; |
636 | |
637 | depth = CvDEPTH(cv); |
638 | if (!depth) { |
639 | if (newoff) { |
640 | if (SvFAKE(sv)) |
641 | continue; |
642 | return 0; /* don't clone from inactive stack frame */ |
643 | } |
644 | depth = 1; |
645 | } |
646 | |
647 | oldpad = (AV*)AvARRAY(curlist)[depth]; |
648 | oldsv = *av_fetch(oldpad, off, TRUE); |
649 | |
650 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
651 | " matched: offset %ld" |
652 | " %s(%lu,%lu), sv=0x%"UVxf"\n", |
653 | (long)off, |
654 | SvFAKE(sv) ? "FAKE " : "", |
655 | (unsigned long)I_32(SvNVX(sv)), |
656 | (unsigned long)SvIVX(sv), |
657 | PTR2UV(oldsv) |
658 | ) |
659 | ); |
660 | |
661 | if (!newoff) { /* Not a mere clone operation. */ |
662 | newoff = pad_add_name( |
663 | SvPVX(sv), |
664 | (SvFLAGS(sv) & SVpad_TYPED) ? SvSTASH(sv) : Nullhv, |
665 | (SvFLAGS(sv) & SVpad_OUR) ? GvSTASH(sv) : Nullhv, |
666 | 1 /* fake */ |
667 | ); |
668 | |
669 | if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) { |
670 | /* "It's closures all the way down." */ |
671 | CvCLONE_on(PL_compcv); |
672 | if (cv == startcv) { |
673 | if (CvANON(PL_compcv)) |
674 | oldsv = Nullsv; /* no need to keep ref */ |
675 | } |
676 | else { |
677 | CV *bcv; |
678 | for (bcv = startcv; |
679 | bcv && bcv != cv && !CvCLONE(bcv); |
680 | bcv = CvOUTSIDE(bcv)) |
681 | { |
682 | if (CvANON(bcv)) { |
683 | /* install the missing pad entry in intervening |
684 | * nested subs and mark them cloneable. */ |
685 | AV *ocomppad_name = PL_comppad_name; |
f3548bdc |
686 | PAD *ocomppad = PL_comppad; |
dd2155a4 |
687 | AV *padlist = CvPADLIST(bcv); |
688 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
689 | PL_comppad = (AV*)AvARRAY(padlist)[1]; |
690 | PL_curpad = AvARRAY(PL_comppad); |
691 | pad_add_name( |
692 | SvPVX(sv), |
693 | (SvFLAGS(sv) & SVpad_TYPED) |
694 | ? SvSTASH(sv) : Nullhv, |
695 | (SvFLAGS(sv) & SVpad_OUR) |
696 | ? GvSTASH(sv) : Nullhv, |
697 | 1 /* fake */ |
698 | ); |
699 | |
700 | PL_comppad_name = ocomppad_name; |
701 | PL_comppad = ocomppad; |
f3548bdc |
702 | PL_curpad = ocomppad ? |
703 | AvARRAY(ocomppad) : Null(SV **); |
dd2155a4 |
704 | CvCLONE_on(bcv); |
705 | } |
706 | else { |
707 | if (ckWARN(WARN_CLOSURE) |
708 | && !CvUNIQUE(bcv) && !CvUNIQUE(cv)) |
709 | { |
710 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
711 | "Variable \"%s\" may be unavailable", |
712 | name); |
713 | } |
714 | break; |
715 | } |
716 | } |
717 | } |
718 | } |
719 | else if (!CvUNIQUE(PL_compcv)) { |
720 | if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv) |
721 | && !(SvFLAGS(sv) & SVpad_OUR)) |
722 | { |
723 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
724 | "Variable \"%s\" will not stay shared", name); |
725 | } |
726 | } |
727 | } |
728 | av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv)); |
f3548bdc |
729 | ASSERT_CURPAD_ACTIVE("pad_findlex 2"); |
dd2155a4 |
730 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
731 | "Pad findlex: set offset %ld to sv 0x%"UVxf"\n", |
732 | (long)newoff, PTR2UV(oldsv) |
733 | ) |
734 | ); |
735 | return newoff; |
736 | } |
737 | } |
738 | |
739 | if (flags & FINDLEX_NOSEARCH) |
740 | return 0; |
741 | |
742 | /* Nothing in current lexical context--try eval's context, if any. |
743 | * This is necessary to let the perldb get at lexically scoped variables. |
744 | * XXX This will also probably interact badly with eval tree caching. |
745 | */ |
746 | |
747 | for (i = cx_ix; i >= 0; i--) { |
748 | cx = &cxstack[i]; |
749 | switch (CxTYPE(cx)) { |
750 | default: |
751 | if (i == 0 && saweval) { |
752 | return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval, 0); |
753 | } |
754 | break; |
755 | case CXt_EVAL: |
756 | switch (cx->blk_eval.old_op_type) { |
757 | case OP_ENTEREVAL: |
758 | if (CxREALEVAL(cx)) { |
759 | PADOFFSET off; |
760 | saweval = i; |
761 | seq = cxstack[i].blk_oldcop->cop_seq; |
762 | startcv = cxstack[i].blk_eval.cv; |
763 | if (startcv && CvOUTSIDE(startcv)) { |
764 | off = pad_findlex(name, newoff, seq, CvOUTSIDE(startcv), |
765 | i - 1, saweval, 0); |
766 | if (off) /* continue looking if not found here */ |
767 | return off; |
768 | } |
769 | } |
770 | break; |
771 | case OP_DOFILE: |
772 | case OP_REQUIRE: |
773 | /* require/do must have their own scope */ |
774 | return 0; |
775 | } |
776 | break; |
777 | case CXt_FORMAT: |
778 | case CXt_SUB: |
779 | if (!saweval) |
780 | return 0; |
781 | cv = cx->blk_sub.cv; |
782 | if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */ |
783 | saweval = i; /* so we know where we were called from */ |
784 | seq = cxstack[i].blk_oldcop->cop_seq; |
785 | continue; |
786 | } |
787 | return pad_findlex(name, newoff, seq, cv, i - 1, saweval, FINDLEX_NOSEARCH); |
788 | } |
789 | } |
790 | |
791 | return 0; |
792 | } |
793 | |
794 | |
795 | /* |
796 | =for apidoc pad_sv |
797 | |
798 | Get the value at offset po in the current pad. |
799 | Use macro PAD_SV instead of calling this function directly. |
800 | |
801 | =cut |
802 | */ |
803 | |
804 | |
805 | SV * |
806 | Perl_pad_sv(pTHX_ PADOFFSET po) |
807 | { |
f3548bdc |
808 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 |
809 | |
dd2155a4 |
810 | if (!po) |
811 | Perl_croak(aTHX_ "panic: pad_sv po"); |
dd2155a4 |
812 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
813 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
814 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 |
815 | ); |
816 | return PL_curpad[po]; |
817 | } |
818 | |
819 | |
820 | /* |
821 | =for apidoc pad_setsv |
822 | |
823 | Set the entry at offset po in the current pad to sv. |
824 | Use the macro PAD_SETSV() rather than calling this function directly. |
825 | |
826 | =cut |
827 | */ |
828 | |
829 | #ifdef DEBUGGING |
830 | void |
831 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) |
832 | { |
f3548bdc |
833 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 |
834 | |
835 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
836 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
837 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 |
838 | ); |
839 | PL_curpad[po] = sv; |
840 | } |
841 | #endif |
842 | |
843 | |
844 | |
845 | /* |
846 | =for apidoc pad_block_start |
847 | |
848 | Update the pad compilation state variables on entry to a new block |
849 | |
850 | =cut |
851 | */ |
852 | |
853 | /* XXX DAPM perhaps: |
854 | * - integrate this in general state-saving routine ??? |
855 | * - combine with the state-saving going on in pad_new ??? |
856 | * - introduce a new SAVE type that does all this in one go ? |
857 | */ |
858 | |
859 | void |
860 | Perl_pad_block_start(pTHX_ int full) |
861 | { |
f3548bdc |
862 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 |
863 | SAVEI32(PL_comppad_name_floor); |
864 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); |
865 | if (full) |
866 | PL_comppad_name_fill = PL_comppad_name_floor; |
867 | if (PL_comppad_name_floor < 0) |
868 | PL_comppad_name_floor = 0; |
869 | SAVEI32(PL_min_intro_pending); |
870 | SAVEI32(PL_max_intro_pending); |
871 | PL_min_intro_pending = 0; |
872 | SAVEI32(PL_comppad_name_fill); |
873 | SAVEI32(PL_padix_floor); |
874 | PL_padix_floor = PL_padix; |
875 | PL_pad_reset_pending = FALSE; |
876 | } |
877 | |
878 | |
879 | /* |
880 | =for apidoc intro_my |
881 | |
882 | "Introduce" my variables to visible status. |
883 | |
884 | =cut |
885 | */ |
886 | |
887 | U32 |
888 | Perl_intro_my(pTHX) |
889 | { |
890 | SV **svp; |
891 | SV *sv; |
892 | I32 i; |
893 | |
f3548bdc |
894 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 |
895 | if (! PL_min_intro_pending) |
896 | return PL_cop_seqmax; |
897 | |
898 | svp = AvARRAY(PL_comppad_name); |
899 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { |
900 | if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) { |
901 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ |
902 | SvNVX(sv) = (NV)PL_cop_seqmax; |
903 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
904 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", |
905 | (long)i, SvPVX(sv), |
906 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) |
907 | ); |
908 | } |
909 | } |
910 | PL_min_intro_pending = 0; |
911 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ |
912 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
913 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); |
914 | |
915 | return PL_cop_seqmax++; |
916 | } |
917 | |
918 | /* |
919 | =for apidoc pad_leavemy |
920 | |
921 | Cleanup at end of scope during compilation: set the max seq number for |
922 | lexicals in this scope and warn of any lexicals that never got introduced. |
923 | |
924 | =cut |
925 | */ |
926 | |
927 | void |
928 | Perl_pad_leavemy(pTHX) |
929 | { |
930 | I32 off; |
931 | SV **svp = AvARRAY(PL_comppad_name); |
932 | SV *sv; |
933 | |
934 | PL_pad_reset_pending = FALSE; |
935 | |
f3548bdc |
936 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 |
937 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
938 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { |
939 | if ((sv = svp[off]) && sv != &PL_sv_undef && ckWARN_d(WARN_INTERNAL)) |
940 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
941 | "%s never introduced", SvPVX(sv)); |
942 | } |
943 | } |
944 | /* "Deintroduce" my variables that are leaving with this scope. */ |
945 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { |
946 | if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX) { |
947 | SvIVX(sv) = PL_cop_seqmax; |
948 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
949 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", |
950 | (long)off, SvPVX(sv), |
951 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) |
952 | ); |
953 | } |
954 | } |
955 | PL_cop_seqmax++; |
956 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
957 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); |
958 | } |
959 | |
960 | |
961 | /* |
962 | =for apidoc pad_swipe |
963 | |
964 | Abandon the tmp in the current pad at offset po and replace with a |
965 | new one. |
966 | |
967 | =cut |
968 | */ |
969 | |
970 | void |
971 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) |
972 | { |
f3548bdc |
973 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 |
974 | if (!PL_curpad) |
975 | return; |
976 | if (AvARRAY(PL_comppad) != PL_curpad) |
977 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); |
978 | if (!po) |
979 | Perl_croak(aTHX_ "panic: pad_swipe po"); |
980 | |
981 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
982 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", |
983 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); |
984 | |
985 | if (PL_curpad[po]) |
986 | SvPADTMP_off(PL_curpad[po]); |
987 | if (refadjust) |
988 | SvREFCNT_dec(PL_curpad[po]); |
989 | |
990 | PL_curpad[po] = NEWSV(1107,0); |
991 | SvPADTMP_on(PL_curpad[po]); |
992 | if ((I32)po < PL_padix) |
993 | PL_padix = po - 1; |
994 | } |
995 | |
996 | |
997 | /* |
998 | =for apidoc pad_reset |
999 | |
1000 | Mark all the current temporaries for reuse |
1001 | |
1002 | =cut |
1003 | */ |
1004 | |
1005 | /* XXX pad_reset() is currently disabled because it results in serious bugs. |
1006 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed |
1007 | * on the stack by OPs that use them, there are several ways to get an alias |
1008 | * to a shared TARG. Such an alias will change randomly and unpredictably. |
1009 | * We avoid doing this until we can think of a Better Way. |
1010 | * GSAR 97-10-29 */ |
1011 | void |
1012 | Perl_pad_reset(pTHX) |
1013 | { |
1014 | #ifdef USE_BROKEN_PAD_RESET |
1015 | register I32 po; |
1016 | |
1017 | if (AvARRAY(PL_comppad) != PL_curpad) |
1018 | Perl_croak(aTHX_ "panic: pad_reset curpad"); |
1019 | |
1020 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1021 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", |
1022 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), |
1023 | (long)PL_padix, (long)PL_padix_floor |
1024 | ) |
1025 | ); |
1026 | |
1027 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ |
1028 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1029 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) |
1030 | SvPADTMP_off(PL_curpad[po]); |
1031 | } |
1032 | PL_padix = PL_padix_floor; |
1033 | } |
1034 | #endif |
1035 | PL_pad_reset_pending = FALSE; |
1036 | } |
1037 | |
1038 | |
1039 | /* |
1040 | =for apidoc pad_tidy |
1041 | |
1042 | Tidy up a pad after we've finished compiling it: |
1043 | * remove most stuff from the pads of anonsub prototypes; |
1044 | * give it a @_; |
1045 | * mark tmps as such. |
1046 | |
1047 | =cut |
1048 | */ |
1049 | |
1050 | /* XXX DAPM surely most of this stuff should be done properly |
1051 | * at the right time beforehand, rather than going around afterwards |
1052 | * cleaning up our mistakes ??? |
1053 | */ |
1054 | |
1055 | void |
1056 | Perl_pad_tidy(pTHX_ padtidy_type type) |
1057 | { |
1058 | PADOFFSET ix; |
1059 | |
f3548bdc |
1060 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
dd2155a4 |
1061 | /* extend curpad to match namepad */ |
1062 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) |
1063 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); |
1064 | |
1065 | if (type == padtidy_SUBCLONE) { |
1066 | SV **namep = AvARRAY(PL_comppad_name); |
1067 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1068 | SV *namesv; |
1069 | |
1070 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1071 | continue; |
1072 | /* |
1073 | * The only things that a clonable function needs in its |
1074 | * pad are references to outer lexicals and anonymous subs. |
1075 | * The rest are created anew during cloning. |
1076 | */ |
1077 | if (!((namesv = namep[ix]) != Nullsv && |
1078 | namesv != &PL_sv_undef && |
1079 | (SvFAKE(namesv) || |
1080 | *SvPVX(namesv) == '&'))) |
1081 | { |
1082 | SvREFCNT_dec(PL_curpad[ix]); |
1083 | PL_curpad[ix] = Nullsv; |
1084 | } |
1085 | } |
1086 | } |
1087 | else if (type == padtidy_SUB) { |
1088 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ |
1089 | AV *av = newAV(); /* Will be @_ */ |
1090 | av_extend(av, 0); |
1091 | av_store(PL_comppad, 0, (SV*)av); |
1092 | AvFLAGS(av) = AVf_REIFY; |
1093 | } |
1094 | |
1095 | /* XXX DAPM rationalise these two similar branches */ |
1096 | |
1097 | if (type == padtidy_SUB) { |
1098 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1099 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1100 | continue; |
1101 | if (!SvPADMY(PL_curpad[ix])) |
1102 | SvPADTMP_on(PL_curpad[ix]); |
1103 | } |
1104 | } |
1105 | else if (type == padtidy_FORMAT) { |
1106 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1107 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) |
1108 | SvPADTMP_on(PL_curpad[ix]); |
1109 | } |
1110 | } |
f3548bdc |
1111 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 |
1112 | } |
1113 | |
1114 | |
1115 | /* |
1116 | =for apidoc pad_free |
1117 | |
1118 | Free the SV at offet po in the current pad. |
1119 | |
1120 | =cut |
1121 | */ |
1122 | |
1123 | /* XXX DAPM integrate with pad_swipe ???? */ |
1124 | void |
1125 | Perl_pad_free(pTHX_ PADOFFSET po) |
1126 | { |
f3548bdc |
1127 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 |
1128 | if (!PL_curpad) |
1129 | return; |
1130 | if (AvARRAY(PL_comppad) != PL_curpad) |
1131 | Perl_croak(aTHX_ "panic: pad_free curpad"); |
1132 | if (!po) |
1133 | Perl_croak(aTHX_ "panic: pad_free po"); |
1134 | |
1135 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1136 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", |
1137 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) |
1138 | ); |
1139 | |
1140 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { |
1141 | SvPADTMP_off(PL_curpad[po]); |
1142 | #ifdef USE_ITHREADS |
1143 | #ifdef PERL_COPY_ON_WRITE |
1144 | if (SvIsCOW(PL_curpad[po])) { |
1145 | sv_force_normal_flags(PL_curpad[po], SV_COW_DROP_PV); |
1146 | } else |
1147 | #endif |
1148 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
1149 | |
1150 | #endif |
1151 | } |
1152 | if ((I32)po < PL_padix) |
1153 | PL_padix = po - 1; |
1154 | } |
1155 | |
1156 | |
1157 | |
1158 | /* |
1159 | =for apidoc do_dump_pad |
1160 | |
1161 | Dump the contents of a padlist |
1162 | |
1163 | =cut |
1164 | */ |
1165 | |
1166 | void |
1167 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) |
1168 | { |
1169 | AV *pad_name; |
1170 | AV *pad; |
1171 | SV **pname; |
1172 | SV **ppad; |
1173 | SV *namesv; |
1174 | I32 ix; |
1175 | |
1176 | if (!padlist) { |
1177 | return; |
1178 | } |
1179 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); |
1180 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); |
1181 | pname = AvARRAY(pad_name); |
1182 | ppad = AvARRAY(pad); |
1183 | Perl_dump_indent(aTHX_ level, file, |
1184 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", |
1185 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) |
1186 | ); |
1187 | |
1188 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { |
1189 | namesv = pname[ix]; |
1190 | if (namesv && namesv == &PL_sv_undef) { |
1191 | namesv = Nullsv; |
1192 | } |
1193 | if (namesv) { |
1194 | Perl_dump_indent(aTHX_ level+1, file, |
1195 | "%2d. 0x%"UVxf"<%lu> %s (%lu,%lu) \"%s\"\n", |
1196 | (int) ix, |
1197 | PTR2UV(ppad[ix]), |
1198 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
1199 | SvFAKE(namesv) ? "FAKE" : " ", |
1200 | (unsigned long)I_32(SvNVX(namesv)), |
1201 | (unsigned long)SvIVX(namesv), |
1202 | SvPVX(namesv) |
1203 | ); |
1204 | } |
1205 | else if (full) { |
1206 | Perl_dump_indent(aTHX_ level+1, file, |
1207 | "%2d. 0x%"UVxf"<%lu>\n", |
1208 | (int) ix, |
1209 | PTR2UV(ppad[ix]), |
1210 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) |
1211 | ); |
1212 | } |
1213 | } |
1214 | } |
1215 | |
1216 | |
1217 | |
1218 | /* |
1219 | =for apidoc cv_dump |
1220 | |
1221 | dump the contents of a CV |
1222 | |
1223 | =cut |
1224 | */ |
1225 | |
1226 | #ifdef DEBUGGING |
1227 | STATIC void |
1228 | S_cv_dump(pTHX_ CV *cv, char *title) |
1229 | { |
1230 | CV *outside = CvOUTSIDE(cv); |
1231 | AV* padlist = CvPADLIST(cv); |
1232 | |
1233 | PerlIO_printf(Perl_debug_log, |
1234 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", |
1235 | title, |
1236 | PTR2UV(cv), |
1237 | (CvANON(cv) ? "ANON" |
1238 | : (cv == PL_main_cv) ? "MAIN" |
1239 | : CvUNIQUE(cv) ? "UNIQUE" |
1240 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), |
1241 | PTR2UV(outside), |
1242 | (!outside ? "null" |
1243 | : CvANON(outside) ? "ANON" |
1244 | : (outside == PL_main_cv) ? "MAIN" |
1245 | : CvUNIQUE(outside) ? "UNIQUE" |
1246 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); |
1247 | |
1248 | PerlIO_printf(Perl_debug_log, |
1249 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); |
1250 | do_dump_pad(1, Perl_debug_log, padlist, 1); |
1251 | } |
1252 | #endif /* DEBUGGING */ |
1253 | |
1254 | |
1255 | |
1256 | |
1257 | |
1258 | /* |
1259 | =for apidoc cv_clone |
1260 | |
1261 | Clone a CV: make a new CV which points to the same code etc, but which |
1262 | has a newly-created pad built by copying the prototype pad and capturing |
1263 | any outer lexicals. |
1264 | |
1265 | =cut |
1266 | */ |
1267 | |
1268 | CV * |
1269 | Perl_cv_clone(pTHX_ CV *proto) |
1270 | { |
1271 | CV *cv; |
1272 | |
1273 | LOCK_CRED_MUTEX; /* XXX create separate mutex */ |
1274 | cv = cv_clone2(proto, CvOUTSIDE(proto)); |
1275 | UNLOCK_CRED_MUTEX; /* XXX create separate mutex */ |
1276 | return cv; |
1277 | } |
1278 | |
1279 | |
1280 | /* XXX DAPM separate out cv and paddish bits ??? |
1281 | * ideally the CV-related stuff shouldn't be in pad.c - how about |
1282 | * a cv.c? */ |
1283 | |
1284 | STATIC CV * |
1285 | S_cv_clone2(pTHX_ CV *proto, CV *outside) |
1286 | { |
1287 | I32 ix; |
1288 | AV* protopadlist = CvPADLIST(proto); |
1289 | AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); |
1290 | AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); |
1291 | SV** pname = AvARRAY(protopad_name); |
1292 | SV** ppad = AvARRAY(protopad); |
1293 | I32 fname = AvFILLp(protopad_name); |
1294 | I32 fpad = AvFILLp(protopad); |
1295 | AV* comppadlist; |
1296 | CV* cv; |
1297 | |
1298 | assert(!CvUNIQUE(proto)); |
1299 | |
1300 | ENTER; |
1301 | SAVESPTR(PL_compcv); |
1302 | |
1303 | cv = PL_compcv = (CV*)NEWSV(1104, 0); |
1304 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
1305 | CvFLAGS(cv) = CvFLAGS(proto) & ~CVf_CLONE; |
1306 | CvCLONED_on(cv); |
1307 | |
dd2155a4 |
1308 | #ifdef USE_ITHREADS |
1309 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) |
1310 | : savepv(CvFILE(proto)); |
1311 | #else |
1312 | CvFILE(cv) = CvFILE(proto); |
1313 | #endif |
1314 | CvGV(cv) = CvGV(proto); |
1315 | CvSTASH(cv) = CvSTASH(proto); |
1316 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
1317 | CvSTART(cv) = CvSTART(proto); |
1318 | if (outside) |
1319 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
1320 | |
1321 | if (SvPOK(proto)) |
1322 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); |
1323 | |
1324 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); |
1325 | |
1326 | for (ix = fname; ix >= 0; ix--) |
1327 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); |
1328 | |
1329 | av_fill(PL_comppad, fpad); |
1330 | PL_curpad = AvARRAY(PL_comppad); |
1331 | |
1332 | for (ix = fpad; ix > 0; ix--) { |
1333 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
1334 | if (namesv && namesv != &PL_sv_undef) { |
1335 | char *name = SvPVX(namesv); /* XXX */ |
1336 | if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */ |
1337 | I32 off = pad_findlex(name, ix, SvIVX(namesv), |
1338 | CvOUTSIDE(cv), cxstack_ix, 0, 0); |
1339 | if (!off) |
1340 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); |
1341 | else if (off != ix) |
1342 | Perl_croak(aTHX_ "panic: cv_clone: %s", name); |
1343 | } |
1344 | else { /* our own lexical */ |
1345 | SV* sv; |
1346 | if (*name == '&') { |
1347 | /* anon code -- we'll come back for it */ |
1348 | sv = SvREFCNT_inc(ppad[ix]); |
1349 | } |
1350 | else if (*name == '@') |
1351 | sv = (SV*)newAV(); |
1352 | else if (*name == '%') |
1353 | sv = (SV*)newHV(); |
1354 | else |
1355 | sv = NEWSV(0, 0); |
1356 | if (!SvPADBUSY(sv)) |
1357 | SvPADMY_on(sv); |
1358 | PL_curpad[ix] = sv; |
1359 | } |
1360 | } |
1361 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { |
1362 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); |
1363 | } |
1364 | else { |
1365 | SV* sv = NEWSV(0, 0); |
1366 | SvPADTMP_on(sv); |
1367 | PL_curpad[ix] = sv; |
1368 | } |
1369 | } |
1370 | |
1371 | /* Now that vars are all in place, clone nested closures. */ |
1372 | |
1373 | for (ix = fpad; ix > 0; ix--) { |
1374 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
1375 | if (namesv |
1376 | && namesv != &PL_sv_undef |
1377 | && !(SvFLAGS(namesv) & SVf_FAKE) |
1378 | && *SvPVX(namesv) == '&' |
1379 | && CvCLONE(ppad[ix])) |
1380 | { |
1381 | CV *kid = cv_clone2((CV*)ppad[ix], cv); |
1382 | SvREFCNT_dec(ppad[ix]); |
1383 | CvCLONE_on(kid); |
1384 | SvPADMY_on(kid); |
1385 | PL_curpad[ix] = (SV*)kid; |
1386 | } |
1387 | } |
1388 | |
1389 | DEBUG_Xv( |
1390 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); |
1391 | cv_dump(outside, "Outside"); |
1392 | cv_dump(proto, "Proto"); |
1393 | cv_dump(cv, "To"); |
1394 | ); |
1395 | |
1396 | LEAVE; |
1397 | |
1398 | if (CvCONST(cv)) { |
1399 | SV* const_sv = op_const_sv(CvSTART(cv), cv); |
1400 | assert(const_sv); |
1401 | /* constant sub () { $x } closing over $x - see lib/constant.pm */ |
1402 | SvREFCNT_dec(cv); |
1403 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); |
1404 | } |
1405 | |
1406 | return cv; |
1407 | } |
1408 | |
1409 | |
1410 | /* |
1411 | =for apidoc pad_fixup_inner_anons |
1412 | |
1413 | For any anon CVs in the pad, change CvOUTSIDE of that CV from |
1414 | old_cv to new_cv if necessary. |
1415 | |
1416 | =cut |
1417 | */ |
1418 | |
1419 | void |
1420 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) |
1421 | { |
1422 | I32 ix; |
1423 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
1424 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
1425 | SV **namepad = AvARRAY(comppad_name); |
1426 | SV **curpad = AvARRAY(comppad); |
1427 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
1428 | SV *namesv = namepad[ix]; |
1429 | if (namesv && namesv != &PL_sv_undef |
1430 | && *SvPVX(namesv) == '&') |
1431 | { |
1432 | CV *innercv = (CV*)curpad[ix]; |
1433 | if (CvOUTSIDE(innercv) == old_cv) { |
1434 | CvOUTSIDE(innercv) = new_cv; |
1435 | if (!CvANON(innercv) || CvCLONED(innercv)) { |
1436 | (void)SvREFCNT_inc(new_cv); |
1437 | SvREFCNT_dec(old_cv); |
1438 | } |
1439 | } |
1440 | } |
1441 | } |
1442 | } |
1443 | |
1444 | /* |
1445 | =for apidoc pad_push |
1446 | |
1447 | Push a new pad frame onto the padlist, unless there's already a pad at |
1448 | this depth, in which case don't bother creating a new one. |
1449 | If has_args is true, give the new pad an @_ in slot zero. |
1450 | |
1451 | =cut |
1452 | */ |
1453 | |
1454 | void |
1455 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) |
1456 | { |
1457 | if (depth <= AvFILLp(padlist)) |
1458 | return; |
1459 | |
1460 | { |
1461 | SV** svp = AvARRAY(padlist); |
1462 | AV *newpad = newAV(); |
1463 | SV **oldpad = AvARRAY(svp[depth-1]); |
1464 | I32 ix = AvFILLp((AV*)svp[1]); |
1465 | I32 names_fill = AvFILLp((AV*)svp[0]); |
1466 | SV** names = AvARRAY(svp[0]); |
1467 | SV* sv; |
1468 | for ( ;ix > 0; ix--) { |
1469 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
1470 | char *name = SvPVX(names[ix]); |
1471 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || *name == '&') { |
1472 | /* outer lexical or anon code */ |
1473 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
1474 | } |
1475 | else { /* our own lexical */ |
1476 | if (*name == '@') |
1477 | av_store(newpad, ix, sv = (SV*)newAV()); |
1478 | else if (*name == '%') |
1479 | av_store(newpad, ix, sv = (SV*)newHV()); |
1480 | else |
1481 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1482 | SvPADMY_on(sv); |
1483 | } |
1484 | } |
1485 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
1486 | av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix])); |
1487 | } |
1488 | else { |
1489 | /* save temporaries on recursion? */ |
1490 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1491 | SvPADTMP_on(sv); |
1492 | } |
1493 | } |
1494 | if (has_args) { |
1495 | AV* av = newAV(); |
1496 | av_extend(av, 0); |
1497 | av_store(newpad, 0, (SV*)av); |
1498 | AvFLAGS(av) = AVf_REIFY; |
1499 | } |
1500 | av_store(padlist, depth, (SV*)newpad); |
1501 | AvFILLp(padlist) = depth; |
1502 | } |
1503 | } |