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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 |
37 | is managed "manual" (mostly in op.c) rather than normal av.c rules. |
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 | |
53 | Itterating over the names AV itterates over all possible pad |
54 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
55 | &PL_sv_undef "names" (see pad_alloc()). |
56 | |
57 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. |
58 | The rest are op targets/GVs/constants which are statically allocated |
59 | or resolved at compile time. These don't have names by which they |
60 | can be looked up from Perl code at run time through eval"" like |
61 | my/our variables can be. Since they can't be looked up by "name" |
62 | but only by their index allocated at compile time (which is usually |
63 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. |
64 | |
65 | The SVs in the names AV have their PV being the name of the variable. |
66 | NV+1..IV inclusive is a range of cop_seq numbers for which the name is |
67 | valid. For typed lexicals name SV is SVt_PVMG and SvSTASH points at the |
68 | type. For C<our> lexicals, the type is SVt_PVGV, and GvSTASH points at the |
69 | stash of the associated global (so that duplicate C<our> delarations in the |
70 | same package can be detected). SvCUR is sometimes hijacked to |
71 | store the generation number during compilation. |
72 | |
73 | If SvFAKE is set on the name SV then slot in the frame AVs are |
74 | a REFCNT'ed references to a lexical from "outside". |
75 | |
76 | If the 'name' is '&' the the corresponding entry in frame AV |
77 | is a CV representing a possible closure. |
78 | (SvFAKE and name of '&' is not a meaningful combination currently but could |
79 | become so if C<my sub foo {}> is implemented.) |
80 | |
81 | =cut |
82 | */ |
83 | |
84 | |
85 | #include "EXTERN.h" |
86 | #define PERL_IN_PAD_C |
87 | #include "perl.h" |
88 | |
89 | |
90 | #define PAD_MAX 999999999 |
91 | |
92 | |
93 | |
94 | /* |
95 | =for apidoc pad_new |
96 | |
97 | Create a new compiling padlist, saving and updating the various global |
98 | vars at the same time as creating the pad itself. The following flags |
99 | can be OR'ed together: |
100 | |
101 | padnew_CLONE this pad is for a cloned CV |
102 | padnew_SAVE save old globals |
103 | padnew_SAVESUB also save extra stuff for start of sub |
104 | |
105 | =cut |
106 | */ |
107 | |
108 | PADLIST * |
109 | Perl_pad_new(pTHX_ padnew_flags flags) |
110 | { |
111 | AV *padlist, *padname, *pad, *a0; |
112 | |
113 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
114 | * vars (based on flags) rather than storing vals + addresses for |
115 | * each individually. Also see pad_block_start. |
116 | * XXX DAPM Try to see whether all these conditionals are required |
117 | */ |
118 | |
119 | /* save existing state, ... */ |
120 | |
121 | if (flags & padnew_SAVE) { |
3979c56f |
122 | SAVECOMPPAD(); |
dd2155a4 |
123 | SAVESPTR(PL_comppad_name); |
124 | if (! (flags & padnew_CLONE)) { |
125 | SAVEI32(PL_padix); |
126 | SAVEI32(PL_comppad_name_fill); |
127 | SAVEI32(PL_min_intro_pending); |
128 | SAVEI32(PL_max_intro_pending); |
129 | if (flags & padnew_SAVESUB) { |
130 | SAVEI32(PL_pad_reset_pending); |
131 | } |
132 | } |
133 | } |
134 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be |
135 | * saved - check at some pt that this is okay */ |
136 | |
137 | /* ... create new pad ... */ |
138 | |
139 | padlist = newAV(); |
140 | padname = newAV(); |
141 | pad = newAV(); |
142 | |
143 | if (flags & padnew_CLONE) { |
144 | /* XXX DAPM I dont know why cv_clone needs it |
145 | * doing differently yet - perhaps this separate branch can be |
146 | * dispensed with eventually ??? |
147 | */ |
148 | |
149 | a0 = newAV(); /* will be @_ */ |
150 | av_extend(a0, 0); |
151 | av_store(pad, 0, (SV*)a0); |
152 | AvFLAGS(a0) = AVf_REIFY; |
153 | } |
154 | else { |
155 | #ifdef USE_5005THREADS |
156 | av_store(padname, 0, newSVpvn("@_", 2)); |
157 | a0 = newAV(); |
158 | SvPADMY_on((SV*)a0); /* XXX Needed? */ |
159 | av_store(pad, 0, (SV*)a0); |
160 | #else |
161 | av_store(pad, 0, Nullsv); |
162 | #endif /* USE_THREADS */ |
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 |
199 | inner subs to outercv. |
200 | |
201 | =cut |
202 | */ |
203 | |
204 | void |
205 | Perl_pad_undef(pTHX_ CV* cv, CV* outercv) |
206 | { |
207 | I32 ix; |
208 | PADLIST *padlist = CvPADLIST(cv); |
209 | |
210 | if (!padlist) |
211 | return; |
212 | if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */ |
213 | return; |
214 | |
215 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
216 | "Pad undef: padlist=0x%"UVxf"\n" , PTR2UV(padlist)) |
217 | ); |
218 | |
219 | /* pads may be cleared out already during global destruction */ |
220 | if ((CvEVAL(cv) && !CvGV(cv) /* is this eval"" ? */ |
221 | && !PL_dirty) || CvSPECIAL(cv)) |
222 | { |
223 | /* XXX DAPM the following code is very similar to |
224 | * pad_fixup_inner_anons(). Merge??? */ |
225 | |
226 | /* inner references to eval's cv must be fixed up */ |
227 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
228 | SV **namepad = AvARRAY(comppad_name); |
229 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
230 | SV **curpad = AvARRAY(comppad); |
231 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
232 | SV *namesv = namepad[ix]; |
233 | if (namesv && namesv != &PL_sv_undef |
234 | && *SvPVX(namesv) == '&' |
235 | && ix <= AvFILLp(comppad)) |
236 | { |
237 | CV *innercv = (CV*)curpad[ix]; |
238 | if (innercv && SvTYPE(innercv) == SVt_PVCV |
239 | && CvOUTSIDE(innercv) == cv) |
240 | { |
241 | CvOUTSIDE(innercv) = outercv; |
242 | if (!CvANON(innercv) || CvCLONED(innercv)) { |
243 | (void)SvREFCNT_inc(outercv); |
244 | if (SvREFCNT(cv)) |
245 | SvREFCNT_dec(cv); |
246 | } |
247 | } |
248 | } |
249 | } |
250 | } |
251 | ix = AvFILLp(padlist); |
252 | while (ix >= 0) { |
253 | SV* sv = AvARRAY(padlist)[ix--]; |
254 | if (!sv) |
255 | continue; |
256 | if (sv == (SV*)PL_comppad_name) |
257 | PL_comppad_name = Nullav; |
258 | else if (sv == (SV*)PL_comppad) { |
259 | PL_comppad = Nullav; |
260 | PL_curpad = Null(SV**); |
261 | } |
262 | SvREFCNT_dec(sv); |
263 | } |
264 | SvREFCNT_dec((SV*)CvPADLIST(cv)); |
265 | CvPADLIST(cv) = Null(PADLIST*); |
266 | } |
267 | |
268 | |
269 | |
270 | |
271 | /* |
272 | =for apidoc pad_add_name |
273 | |
274 | Create a new name in the current pad at the specified offset. |
275 | If C<typestash> is valid, the name is for a typed lexical; set the |
276 | name's stash to that value. |
277 | If C<ourstash> is valid, it's an our lexical, set the name's |
278 | GvSTASH to that value |
279 | |
280 | Also, if the name is @.. or %.., create a new array or hash for that slot |
281 | |
282 | If fake, it means we're cloning an existing entry |
283 | |
284 | =cut |
285 | */ |
286 | |
287 | /* |
288 | * XXX DAPM this doesn't seem the right place to create a new array/hash. |
289 | * Whatever we do, we should be consistent - create scalars too, and |
290 | * create even if fake. Really need to integrate better the whole entry |
291 | * creation business - when + where does the name and value get created? |
292 | */ |
293 | |
294 | PADOFFSET |
295 | Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) |
296 | { |
297 | PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
298 | SV* namesv = NEWSV(1102, 0); |
299 | U32 min, max; |
300 | |
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; |
339 | if (*name == '@') |
340 | av_store(PL_comppad, offset, (SV*)newAV()); |
341 | else if (*name == '%') |
342 | av_store(PL_comppad, offset, (SV*)newHV()); |
343 | SvPADMY_on(PL_curpad[offset]); |
344 | } |
345 | |
346 | return offset; |
347 | } |
348 | |
349 | |
350 | |
351 | |
352 | /* |
353 | =for apidoc pad_alloc |
354 | |
355 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto |
356 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards |
357 | for a slot which has no name and and no active value. |
358 | |
359 | =cut |
360 | */ |
361 | |
362 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), |
363 | * or at least rationalise ??? */ |
364 | |
365 | |
366 | PADOFFSET |
367 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) |
368 | { |
369 | SV *sv; |
370 | I32 retval; |
371 | |
372 | if (AvARRAY(PL_comppad) != PL_curpad) |
373 | Perl_croak(aTHX_ "panic: pad_alloc"); |
374 | if (PL_pad_reset_pending) |
375 | pad_reset(); |
376 | if (tmptype & SVs_PADMY) { |
377 | do { |
378 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
379 | } while (SvPADBUSY(sv)); /* need a fresh one */ |
380 | retval = AvFILLp(PL_comppad); |
381 | } |
382 | else { |
383 | SV **names = AvARRAY(PL_comppad_name); |
384 | SSize_t names_fill = AvFILLp(PL_comppad_name); |
385 | for (;;) { |
386 | /* |
387 | * "foreach" index vars temporarily become aliases to non-"my" |
388 | * values. Thus we must skip, not just pad values that are |
389 | * marked as current pad values, but also those with names. |
390 | */ |
391 | /* HVDS why copy to sv here? we don't seem to use it */ |
392 | if (++PL_padix <= names_fill && |
393 | (sv = names[PL_padix]) && sv != &PL_sv_undef) |
394 | continue; |
395 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); |
396 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && |
397 | !IS_PADGV(sv) && !IS_PADCONST(sv)) |
398 | break; |
399 | } |
400 | retval = PL_padix; |
401 | } |
402 | SvFLAGS(sv) |= tmptype; |
403 | PL_curpad = AvARRAY(PL_comppad); |
404 | |
405 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
406 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", |
407 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, |
408 | PL_op_name[optype])); |
409 | return (PADOFFSET)retval; |
410 | } |
411 | |
412 | /* |
413 | =for apidoc pad_add_anon |
414 | |
415 | Add an anon code entry to the current compiling pad |
416 | |
417 | =cut |
418 | */ |
419 | |
420 | PADOFFSET |
421 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) |
422 | { |
423 | PADOFFSET ix; |
424 | SV* name; |
425 | |
426 | name = NEWSV(1106, 0); |
427 | sv_upgrade(name, SVt_PVNV); |
428 | sv_setpvn(name, "&", 1); |
429 | SvIVX(name) = -1; |
430 | SvNVX(name) = 1; |
431 | ix = pad_alloc(op_type, SVs_PADMY); |
432 | av_store(PL_comppad_name, ix, name); |
433 | av_store(PL_comppad, ix, sv); |
434 | SvPADMY_on(sv); |
435 | return ix; |
436 | } |
437 | |
438 | |
439 | |
440 | /* |
441 | =for apidoc pad_check_dup |
442 | |
443 | Check for duplicate declarations: report any of: |
444 | * a my in the current scope with the same name; |
445 | * an our (anywhere in the pad) with the same name and the same stash |
446 | as C<ourstash> |
447 | C<is_our> indicates that the name to check is an 'our' declaration |
448 | |
449 | =cut |
450 | */ |
451 | |
452 | /* XXX DAPM integrate this into pad_add_name ??? */ |
453 | |
454 | void |
455 | Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) |
456 | { |
457 | SV **svp, *sv; |
458 | PADOFFSET top, off; |
459 | |
460 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) |
461 | return; /* nothing to check */ |
462 | |
463 | svp = AvARRAY(PL_comppad_name); |
464 | top = AvFILLp(PL_comppad_name); |
465 | /* check the current scope */ |
466 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same |
467 | * type ? */ |
468 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { |
469 | if ((sv = svp[off]) |
470 | && sv != &PL_sv_undef |
471 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
472 | && (!is_our |
473 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) |
474 | && strEQ(name, SvPVX(sv))) |
475 | { |
476 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
477 | "\"%s\" variable %s masks earlier declaration in same %s", |
478 | (is_our ? "our" : "my"), |
479 | name, |
480 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); |
481 | --off; |
482 | break; |
483 | } |
484 | } |
485 | /* check the rest of the pad */ |
486 | if (is_our) { |
487 | do { |
488 | if ((sv = svp[off]) |
489 | && sv != &PL_sv_undef |
490 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
491 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) |
492 | && strEQ(name, SvPVX(sv))) |
493 | { |
494 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
495 | "\"our\" variable %s redeclared", name); |
496 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
497 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); |
498 | break; |
499 | } |
500 | } while ( off-- > 0 ); |
501 | } |
502 | } |
503 | |
504 | |
505 | |
506 | /* |
507 | =for apidoc pad_findmy |
508 | |
509 | Given a lexical name, try to find its offset, first in the current pad, |
510 | or failing that, in the pads of any lexically enclosing subs (including |
511 | the complications introduced by eval). If the name is found in an outer pad, |
512 | then a fake entry is added to the current pad. |
513 | Returns the offset in the current pad, or NOT_IN_PAD on failure. |
514 | |
515 | =cut |
516 | */ |
517 | |
518 | PADOFFSET |
519 | Perl_pad_findmy(pTHX_ char *name) |
520 | { |
521 | I32 off; |
522 | I32 pendoff = 0; |
523 | SV *sv; |
524 | SV **svp = AvARRAY(PL_comppad_name); |
525 | U32 seq = PL_cop_seqmax; |
526 | PERL_CONTEXT *cx; |
527 | CV *outside; |
528 | |
529 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad findmy: \"%s\"\n", name)); |
530 | |
531 | #ifdef USE_5005THREADS |
532 | /* |
533 | * Special case to get lexical (and hence per-thread) @_. |
534 | * XXX I need to find out how to tell at parse-time whether use |
535 | * of @_ should refer to a lexical (from a sub) or defgv (global |
536 | * scope and maybe weird sub-ish things like formats). See |
537 | * startsub in perly.y. It's possible that @_ could be lexical |
538 | * (at least from subs) even in non-threaded perl. |
539 | */ |
540 | if (strEQ(name, "@_")) |
541 | return 0; /* success. (NOT_IN_PAD indicates failure) */ |
542 | #endif /* USE_5005THREADS */ |
543 | |
544 | /* The one we're looking for is probably just before comppad_name_fill. */ |
545 | for (off = AvFILLp(PL_comppad_name); off > 0; off--) { |
546 | if ((sv = svp[off]) && |
547 | sv != &PL_sv_undef && |
548 | (!SvIVX(sv) || |
549 | (seq <= (U32)SvIVX(sv) && |
550 | seq > (U32)I_32(SvNVX(sv)))) && |
551 | strEQ(SvPVX(sv), name)) |
552 | { |
553 | if (SvIVX(sv) || SvFLAGS(sv) & SVpad_OUR) |
554 | return (PADOFFSET)off; |
555 | pendoff = off; /* this pending def. will override import */ |
556 | } |
557 | } |
558 | |
559 | outside = CvOUTSIDE(PL_compcv); |
560 | |
561 | /* Check if if we're compiling an eval'', and adjust seq to be the |
562 | * eval's seq number. This depends on eval'' having a non-null |
563 | * CvOUTSIDE() while it is being compiled. The eval'' itself is |
564 | * identified by CvEVAL being true and CvGV being null. */ |
565 | if (outside && CvEVAL(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) { |
566 | cx = &cxstack[cxstack_ix]; |
567 | if (CxREALEVAL(cx)) |
568 | seq = cx->blk_oldcop->cop_seq; |
569 | } |
570 | |
571 | /* See if it's in a nested scope */ |
572 | off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0, 0); |
573 | if (!off) /* pad_findlex returns 0 for failure...*/ |
574 | return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */ |
575 | |
576 | /* If there is a pending local definition, this new alias must die */ |
577 | if (pendoff) |
578 | SvIVX(AvARRAY(PL_comppad_name)[off]) = seq; |
579 | return off; |
580 | } |
581 | |
582 | |
583 | |
584 | /* |
585 | =for apidoc pad_findlex |
586 | |
587 | Find a named lexical anywhere in a chain of nested pads. Add fake entries |
588 | in the inner pads if its found in an outer one. |
589 | |
590 | If flags == FINDLEX_NOSEARCH we don't bother searching outer contexts. |
591 | |
592 | =cut |
593 | */ |
594 | |
595 | #define FINDLEX_NOSEARCH 1 /* don't search outer contexts */ |
596 | |
597 | STATIC PADOFFSET |
598 | S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, U32 seq, CV* startcv, |
599 | I32 cx_ix, I32 saweval, U32 flags) |
600 | { |
601 | CV *cv; |
602 | I32 off; |
603 | SV *sv; |
604 | register I32 i; |
605 | register PERL_CONTEXT *cx; |
606 | |
607 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
608 | "Pad findlex: \"%s\" off=%ld seq=%lu cv=0x%"UVxf |
609 | " ix=%ld saweval=%d flags=%lu\n", |
610 | name, (long)newoff, (unsigned long)seq, PTR2UV(startcv), |
611 | (long)cx_ix, (int)saweval, (unsigned long)flags |
612 | ) |
613 | ); |
614 | |
615 | for (cv = startcv; cv; cv = CvOUTSIDE(cv)) { |
616 | AV *curlist = CvPADLIST(cv); |
617 | SV **svp = av_fetch(curlist, 0, FALSE); |
618 | AV *curname; |
619 | |
620 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
621 | " searching: cv=0x%"UVxf"\n", PTR2UV(cv)) |
622 | ); |
623 | |
624 | if (!svp || *svp == &PL_sv_undef) |
625 | continue; |
626 | curname = (AV*)*svp; |
627 | svp = AvARRAY(curname); |
628 | for (off = AvFILLp(curname); off > 0; off--) { |
629 | I32 depth; |
630 | AV *oldpad; |
631 | SV *oldsv; |
632 | |
633 | if ( ! ( |
634 | (sv = svp[off]) && |
635 | sv != &PL_sv_undef && |
636 | seq <= (U32)SvIVX(sv) && |
637 | seq > (U32)I_32(SvNVX(sv)) && |
638 | strEQ(SvPVX(sv), name)) |
639 | ) |
640 | continue; |
641 | |
642 | depth = CvDEPTH(cv); |
643 | if (!depth) { |
644 | if (newoff) { |
645 | if (SvFAKE(sv)) |
646 | continue; |
647 | return 0; /* don't clone from inactive stack frame */ |
648 | } |
649 | depth = 1; |
650 | } |
651 | |
652 | oldpad = (AV*)AvARRAY(curlist)[depth]; |
653 | oldsv = *av_fetch(oldpad, off, TRUE); |
654 | |
655 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
656 | " matched: offset %ld" |
657 | " %s(%lu,%lu), sv=0x%"UVxf"\n", |
658 | (long)off, |
659 | SvFAKE(sv) ? "FAKE " : "", |
660 | (unsigned long)I_32(SvNVX(sv)), |
661 | (unsigned long)SvIVX(sv), |
662 | PTR2UV(oldsv) |
663 | ) |
664 | ); |
665 | |
666 | if (!newoff) { /* Not a mere clone operation. */ |
667 | newoff = pad_add_name( |
668 | SvPVX(sv), |
669 | (SvFLAGS(sv) & SVpad_TYPED) ? SvSTASH(sv) : Nullhv, |
670 | (SvFLAGS(sv) & SVpad_OUR) ? GvSTASH(sv) : Nullhv, |
671 | 1 /* fake */ |
672 | ); |
673 | |
674 | if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) { |
675 | /* "It's closures all the way down." */ |
676 | CvCLONE_on(PL_compcv); |
677 | if (cv == startcv) { |
678 | if (CvANON(PL_compcv)) |
679 | oldsv = Nullsv; /* no need to keep ref */ |
680 | } |
681 | else { |
682 | CV *bcv; |
683 | for (bcv = startcv; |
684 | bcv && bcv != cv && !CvCLONE(bcv); |
685 | bcv = CvOUTSIDE(bcv)) |
686 | { |
687 | if (CvANON(bcv)) { |
688 | /* install the missing pad entry in intervening |
689 | * nested subs and mark them cloneable. */ |
690 | AV *ocomppad_name = PL_comppad_name; |
691 | AV *ocomppad = PL_comppad; |
692 | SV **ocurpad = PL_curpad; |
693 | AV *padlist = CvPADLIST(bcv); |
694 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
695 | PL_comppad = (AV*)AvARRAY(padlist)[1]; |
696 | PL_curpad = AvARRAY(PL_comppad); |
697 | pad_add_name( |
698 | SvPVX(sv), |
699 | (SvFLAGS(sv) & SVpad_TYPED) |
700 | ? SvSTASH(sv) : Nullhv, |
701 | (SvFLAGS(sv) & SVpad_OUR) |
702 | ? GvSTASH(sv) : Nullhv, |
703 | 1 /* fake */ |
704 | ); |
705 | |
706 | PL_comppad_name = ocomppad_name; |
707 | PL_comppad = ocomppad; |
708 | PL_curpad = ocurpad; |
709 | CvCLONE_on(bcv); |
710 | } |
711 | else { |
712 | if (ckWARN(WARN_CLOSURE) |
713 | && !CvUNIQUE(bcv) && !CvUNIQUE(cv)) |
714 | { |
715 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
716 | "Variable \"%s\" may be unavailable", |
717 | name); |
718 | } |
719 | break; |
720 | } |
721 | } |
722 | } |
723 | } |
724 | else if (!CvUNIQUE(PL_compcv)) { |
725 | if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv) |
726 | && !(SvFLAGS(sv) & SVpad_OUR)) |
727 | { |
728 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
729 | "Variable \"%s\" will not stay shared", name); |
730 | } |
731 | } |
732 | } |
733 | av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv)); |
734 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
735 | "Pad findlex: set offset %ld to sv 0x%"UVxf"\n", |
736 | (long)newoff, PTR2UV(oldsv) |
737 | ) |
738 | ); |
739 | return newoff; |
740 | } |
741 | } |
742 | |
743 | if (flags & FINDLEX_NOSEARCH) |
744 | return 0; |
745 | |
746 | /* Nothing in current lexical context--try eval's context, if any. |
747 | * This is necessary to let the perldb get at lexically scoped variables. |
748 | * XXX This will also probably interact badly with eval tree caching. |
749 | */ |
750 | |
751 | for (i = cx_ix; i >= 0; i--) { |
752 | cx = &cxstack[i]; |
753 | switch (CxTYPE(cx)) { |
754 | default: |
755 | if (i == 0 && saweval) { |
756 | return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval, 0); |
757 | } |
758 | break; |
759 | case CXt_EVAL: |
760 | switch (cx->blk_eval.old_op_type) { |
761 | case OP_ENTEREVAL: |
762 | if (CxREALEVAL(cx)) { |
763 | PADOFFSET off; |
764 | saweval = i; |
765 | seq = cxstack[i].blk_oldcop->cop_seq; |
766 | startcv = cxstack[i].blk_eval.cv; |
767 | if (startcv && CvOUTSIDE(startcv)) { |
768 | off = pad_findlex(name, newoff, seq, CvOUTSIDE(startcv), |
769 | i - 1, saweval, 0); |
770 | if (off) /* continue looking if not found here */ |
771 | return off; |
772 | } |
773 | } |
774 | break; |
775 | case OP_DOFILE: |
776 | case OP_REQUIRE: |
777 | /* require/do must have their own scope */ |
778 | return 0; |
779 | } |
780 | break; |
781 | case CXt_FORMAT: |
782 | case CXt_SUB: |
783 | if (!saweval) |
784 | return 0; |
785 | cv = cx->blk_sub.cv; |
786 | if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */ |
787 | saweval = i; /* so we know where we were called from */ |
788 | seq = cxstack[i].blk_oldcop->cop_seq; |
789 | continue; |
790 | } |
791 | return pad_findlex(name, newoff, seq, cv, i - 1, saweval, FINDLEX_NOSEARCH); |
792 | } |
793 | } |
794 | |
795 | return 0; |
796 | } |
797 | |
798 | |
799 | /* |
800 | =for apidoc pad_sv |
801 | |
802 | Get the value at offset po in the current pad. |
803 | Use macro PAD_SV instead of calling this function directly. |
804 | |
805 | =cut |
806 | */ |
807 | |
808 | |
809 | SV * |
810 | Perl_pad_sv(pTHX_ PADOFFSET po) |
811 | { |
812 | #ifdef DEBUGGING |
813 | /* for display purposes, try to guess the AV corresponding to |
814 | * Pl_curpad */ |
815 | AV *cp = PL_comppad; |
816 | if (cp && AvARRAY(cp) != PL_curpad) |
817 | cp = Nullav; |
818 | #endif |
819 | |
820 | #ifndef USE_5005THREADS |
821 | if (!po) |
822 | Perl_croak(aTHX_ "panic: pad_sv po"); |
823 | #endif |
824 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
825 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", |
826 | PTR2UV(cp), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
827 | ); |
828 | return PL_curpad[po]; |
829 | } |
830 | |
831 | |
832 | /* |
833 | =for apidoc pad_setsv |
834 | |
835 | Set the entry at offset po in the current pad to sv. |
836 | Use the macro PAD_SETSV() rather than calling this function directly. |
837 | |
838 | =cut |
839 | */ |
840 | |
841 | #ifdef DEBUGGING |
842 | void |
843 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) |
844 | { |
845 | /* for display purposes, try to guess the AV corresponding to |
846 | * Pl_curpad */ |
847 | AV *cp = PL_comppad; |
848 | if (cp && AvARRAY(cp) != PL_curpad) |
849 | cp = Nullav; |
850 | |
851 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
852 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", |
853 | PTR2UV(cp), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
854 | ); |
855 | PL_curpad[po] = sv; |
856 | } |
857 | #endif |
858 | |
859 | |
860 | |
861 | /* |
862 | =for apidoc pad_block_start |
863 | |
864 | Update the pad compilation state variables on entry to a new block |
865 | |
866 | =cut |
867 | */ |
868 | |
869 | /* XXX DAPM perhaps: |
870 | * - integrate this in general state-saving routine ??? |
871 | * - combine with the state-saving going on in pad_new ??? |
872 | * - introduce a new SAVE type that does all this in one go ? |
873 | */ |
874 | |
875 | void |
876 | Perl_pad_block_start(pTHX_ int full) |
877 | { |
878 | SAVEI32(PL_comppad_name_floor); |
879 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); |
880 | if (full) |
881 | PL_comppad_name_fill = PL_comppad_name_floor; |
882 | if (PL_comppad_name_floor < 0) |
883 | PL_comppad_name_floor = 0; |
884 | SAVEI32(PL_min_intro_pending); |
885 | SAVEI32(PL_max_intro_pending); |
886 | PL_min_intro_pending = 0; |
887 | SAVEI32(PL_comppad_name_fill); |
888 | SAVEI32(PL_padix_floor); |
889 | PL_padix_floor = PL_padix; |
890 | PL_pad_reset_pending = FALSE; |
891 | } |
892 | |
893 | |
894 | /* |
895 | =for apidoc intro_my |
896 | |
897 | "Introduce" my variables to visible status. |
898 | |
899 | =cut |
900 | */ |
901 | |
902 | U32 |
903 | Perl_intro_my(pTHX) |
904 | { |
905 | SV **svp; |
906 | SV *sv; |
907 | I32 i; |
908 | |
909 | if (! PL_min_intro_pending) |
910 | return PL_cop_seqmax; |
911 | |
912 | svp = AvARRAY(PL_comppad_name); |
913 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { |
914 | if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) { |
915 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ |
916 | SvNVX(sv) = (NV)PL_cop_seqmax; |
917 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
918 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", |
919 | (long)i, SvPVX(sv), |
920 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) |
921 | ); |
922 | } |
923 | } |
924 | PL_min_intro_pending = 0; |
925 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ |
926 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
927 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); |
928 | |
929 | return PL_cop_seqmax++; |
930 | } |
931 | |
932 | /* |
933 | =for apidoc pad_leavemy |
934 | |
935 | Cleanup at end of scope during compilation: set the max seq number for |
936 | lexicals in this scope and warn of any lexicals that never got introduced. |
937 | |
938 | =cut |
939 | */ |
940 | |
941 | void |
942 | Perl_pad_leavemy(pTHX) |
943 | { |
944 | I32 off; |
945 | SV **svp = AvARRAY(PL_comppad_name); |
946 | SV *sv; |
947 | |
948 | PL_pad_reset_pending = FALSE; |
949 | |
950 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
951 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { |
952 | if ((sv = svp[off]) && sv != &PL_sv_undef && ckWARN_d(WARN_INTERNAL)) |
953 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
954 | "%s never introduced", SvPVX(sv)); |
955 | } |
956 | } |
957 | /* "Deintroduce" my variables that are leaving with this scope. */ |
958 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { |
959 | if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX) { |
960 | SvIVX(sv) = PL_cop_seqmax; |
961 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
962 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", |
963 | (long)off, SvPVX(sv), |
964 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) |
965 | ); |
966 | } |
967 | } |
968 | PL_cop_seqmax++; |
969 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
970 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); |
971 | } |
972 | |
973 | |
974 | /* |
975 | =for apidoc pad_swipe |
976 | |
977 | Abandon the tmp in the current pad at offset po and replace with a |
978 | new one. |
979 | |
980 | =cut |
981 | */ |
982 | |
983 | void |
984 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) |
985 | { |
986 | if (!PL_curpad) |
987 | return; |
988 | if (AvARRAY(PL_comppad) != PL_curpad) |
989 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); |
990 | if (!po) |
991 | Perl_croak(aTHX_ "panic: pad_swipe po"); |
992 | |
993 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
994 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", |
995 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); |
996 | |
997 | if (PL_curpad[po]) |
998 | SvPADTMP_off(PL_curpad[po]); |
999 | if (refadjust) |
1000 | SvREFCNT_dec(PL_curpad[po]); |
1001 | |
1002 | PL_curpad[po] = NEWSV(1107,0); |
1003 | SvPADTMP_on(PL_curpad[po]); |
1004 | if ((I32)po < PL_padix) |
1005 | PL_padix = po - 1; |
1006 | } |
1007 | |
1008 | |
1009 | /* |
1010 | =for apidoc pad_reset |
1011 | |
1012 | Mark all the current temporaries for reuse |
1013 | |
1014 | =cut |
1015 | */ |
1016 | |
1017 | /* XXX pad_reset() is currently disabled because it results in serious bugs. |
1018 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed |
1019 | * on the stack by OPs that use them, there are several ways to get an alias |
1020 | * to a shared TARG. Such an alias will change randomly and unpredictably. |
1021 | * We avoid doing this until we can think of a Better Way. |
1022 | * GSAR 97-10-29 */ |
1023 | void |
1024 | Perl_pad_reset(pTHX) |
1025 | { |
1026 | #ifdef USE_BROKEN_PAD_RESET |
1027 | register I32 po; |
1028 | |
1029 | if (AvARRAY(PL_comppad) != PL_curpad) |
1030 | Perl_croak(aTHX_ "panic: pad_reset curpad"); |
1031 | |
1032 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1033 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", |
1034 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), |
1035 | (long)PL_padix, (long)PL_padix_floor |
1036 | ) |
1037 | ); |
1038 | |
1039 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ |
1040 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1041 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) |
1042 | SvPADTMP_off(PL_curpad[po]); |
1043 | } |
1044 | PL_padix = PL_padix_floor; |
1045 | } |
1046 | #endif |
1047 | PL_pad_reset_pending = FALSE; |
1048 | } |
1049 | |
1050 | |
1051 | /* |
1052 | =for apidoc pad_tidy |
1053 | |
1054 | Tidy up a pad after we've finished compiling it: |
1055 | * remove most stuff from the pads of anonsub prototypes; |
1056 | * give it a @_; |
1057 | * mark tmps as such. |
1058 | |
1059 | =cut |
1060 | */ |
1061 | |
1062 | /* XXX DAPM surely most of this stuff should be done properly |
1063 | * at the right time beforehand, rather than going around afterwards |
1064 | * cleaning up our mistakes ??? |
1065 | */ |
1066 | |
1067 | void |
1068 | Perl_pad_tidy(pTHX_ padtidy_type type) |
1069 | { |
1070 | PADOFFSET ix; |
1071 | |
1072 | /* extend curpad to match namepad */ |
1073 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) |
1074 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); |
1075 | |
1076 | if (type == padtidy_SUBCLONE) { |
1077 | SV **namep = AvARRAY(PL_comppad_name); |
1078 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1079 | SV *namesv; |
1080 | |
1081 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1082 | continue; |
1083 | /* |
1084 | * The only things that a clonable function needs in its |
1085 | * pad are references to outer lexicals and anonymous subs. |
1086 | * The rest are created anew during cloning. |
1087 | */ |
1088 | if (!((namesv = namep[ix]) != Nullsv && |
1089 | namesv != &PL_sv_undef && |
1090 | (SvFAKE(namesv) || |
1091 | *SvPVX(namesv) == '&'))) |
1092 | { |
1093 | SvREFCNT_dec(PL_curpad[ix]); |
1094 | PL_curpad[ix] = Nullsv; |
1095 | } |
1096 | } |
1097 | } |
1098 | else if (type == padtidy_SUB) { |
1099 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ |
1100 | AV *av = newAV(); /* Will be @_ */ |
1101 | av_extend(av, 0); |
1102 | av_store(PL_comppad, 0, (SV*)av); |
1103 | AvFLAGS(av) = AVf_REIFY; |
1104 | } |
1105 | |
1106 | /* XXX DAPM rationalise these two similar branches */ |
1107 | |
1108 | if (type == padtidy_SUB) { |
1109 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1110 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1111 | continue; |
1112 | if (!SvPADMY(PL_curpad[ix])) |
1113 | SvPADTMP_on(PL_curpad[ix]); |
1114 | } |
1115 | } |
1116 | else if (type == padtidy_FORMAT) { |
1117 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1118 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) |
1119 | SvPADTMP_on(PL_curpad[ix]); |
1120 | } |
1121 | } |
1122 | } |
1123 | |
1124 | |
1125 | /* |
1126 | =for apidoc pad_free |
1127 | |
1128 | Free the SV at offet po in the current pad. |
1129 | |
1130 | =cut |
1131 | */ |
1132 | |
1133 | /* XXX DAPM integrate with pad_swipe ???? */ |
1134 | void |
1135 | Perl_pad_free(pTHX_ PADOFFSET po) |
1136 | { |
1137 | if (!PL_curpad) |
1138 | return; |
1139 | if (AvARRAY(PL_comppad) != PL_curpad) |
1140 | Perl_croak(aTHX_ "panic: pad_free curpad"); |
1141 | if (!po) |
1142 | Perl_croak(aTHX_ "panic: pad_free po"); |
1143 | |
1144 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1145 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", |
1146 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) |
1147 | ); |
1148 | |
1149 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { |
1150 | SvPADTMP_off(PL_curpad[po]); |
1151 | #ifdef USE_ITHREADS |
1152 | #ifdef PERL_COPY_ON_WRITE |
1153 | if (SvIsCOW(PL_curpad[po])) { |
1154 | sv_force_normal_flags(PL_curpad[po], SV_COW_DROP_PV); |
1155 | } else |
1156 | #endif |
1157 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
1158 | |
1159 | #endif |
1160 | } |
1161 | if ((I32)po < PL_padix) |
1162 | PL_padix = po - 1; |
1163 | } |
1164 | |
1165 | |
1166 | |
1167 | /* |
1168 | =for apidoc do_dump_pad |
1169 | |
1170 | Dump the contents of a padlist |
1171 | |
1172 | =cut |
1173 | */ |
1174 | |
1175 | void |
1176 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) |
1177 | { |
1178 | AV *pad_name; |
1179 | AV *pad; |
1180 | SV **pname; |
1181 | SV **ppad; |
1182 | SV *namesv; |
1183 | I32 ix; |
1184 | |
1185 | if (!padlist) { |
1186 | return; |
1187 | } |
1188 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); |
1189 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); |
1190 | pname = AvARRAY(pad_name); |
1191 | ppad = AvARRAY(pad); |
1192 | Perl_dump_indent(aTHX_ level, file, |
1193 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", |
1194 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) |
1195 | ); |
1196 | |
1197 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { |
1198 | namesv = pname[ix]; |
1199 | if (namesv && namesv == &PL_sv_undef) { |
1200 | namesv = Nullsv; |
1201 | } |
1202 | if (namesv) { |
1203 | Perl_dump_indent(aTHX_ level+1, file, |
1204 | "%2d. 0x%"UVxf"<%lu> %s (%lu,%lu) \"%s\"\n", |
1205 | (int) ix, |
1206 | PTR2UV(ppad[ix]), |
1207 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
1208 | SvFAKE(namesv) ? "FAKE" : " ", |
1209 | (unsigned long)I_32(SvNVX(namesv)), |
1210 | (unsigned long)SvIVX(namesv), |
1211 | SvPVX(namesv) |
1212 | ); |
1213 | } |
1214 | else if (full) { |
1215 | Perl_dump_indent(aTHX_ level+1, file, |
1216 | "%2d. 0x%"UVxf"<%lu>\n", |
1217 | (int) ix, |
1218 | PTR2UV(ppad[ix]), |
1219 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) |
1220 | ); |
1221 | } |
1222 | } |
1223 | } |
1224 | |
1225 | |
1226 | |
1227 | /* |
1228 | =for apidoc cv_dump |
1229 | |
1230 | dump the contents of a CV |
1231 | |
1232 | =cut |
1233 | */ |
1234 | |
1235 | #ifdef DEBUGGING |
1236 | STATIC void |
1237 | S_cv_dump(pTHX_ CV *cv, char *title) |
1238 | { |
1239 | CV *outside = CvOUTSIDE(cv); |
1240 | AV* padlist = CvPADLIST(cv); |
1241 | |
1242 | PerlIO_printf(Perl_debug_log, |
1243 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", |
1244 | title, |
1245 | PTR2UV(cv), |
1246 | (CvANON(cv) ? "ANON" |
1247 | : (cv == PL_main_cv) ? "MAIN" |
1248 | : CvUNIQUE(cv) ? "UNIQUE" |
1249 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), |
1250 | PTR2UV(outside), |
1251 | (!outside ? "null" |
1252 | : CvANON(outside) ? "ANON" |
1253 | : (outside == PL_main_cv) ? "MAIN" |
1254 | : CvUNIQUE(outside) ? "UNIQUE" |
1255 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); |
1256 | |
1257 | PerlIO_printf(Perl_debug_log, |
1258 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); |
1259 | do_dump_pad(1, Perl_debug_log, padlist, 1); |
1260 | } |
1261 | #endif /* DEBUGGING */ |
1262 | |
1263 | |
1264 | |
1265 | |
1266 | |
1267 | /* |
1268 | =for apidoc cv_clone |
1269 | |
1270 | Clone a CV: make a new CV which points to the same code etc, but which |
1271 | has a newly-created pad built by copying the prototype pad and capturing |
1272 | any outer lexicals. |
1273 | |
1274 | =cut |
1275 | */ |
1276 | |
1277 | CV * |
1278 | Perl_cv_clone(pTHX_ CV *proto) |
1279 | { |
1280 | CV *cv; |
1281 | |
1282 | LOCK_CRED_MUTEX; /* XXX create separate mutex */ |
1283 | cv = cv_clone2(proto, CvOUTSIDE(proto)); |
1284 | UNLOCK_CRED_MUTEX; /* XXX create separate mutex */ |
1285 | return cv; |
1286 | } |
1287 | |
1288 | |
1289 | /* XXX DAPM separate out cv and paddish bits ??? |
1290 | * ideally the CV-related stuff shouldn't be in pad.c - how about |
1291 | * a cv.c? */ |
1292 | |
1293 | STATIC CV * |
1294 | S_cv_clone2(pTHX_ CV *proto, CV *outside) |
1295 | { |
1296 | I32 ix; |
1297 | AV* protopadlist = CvPADLIST(proto); |
1298 | AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); |
1299 | AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); |
1300 | SV** pname = AvARRAY(protopad_name); |
1301 | SV** ppad = AvARRAY(protopad); |
1302 | I32 fname = AvFILLp(protopad_name); |
1303 | I32 fpad = AvFILLp(protopad); |
1304 | AV* comppadlist; |
1305 | CV* cv; |
1306 | |
1307 | assert(!CvUNIQUE(proto)); |
1308 | |
1309 | ENTER; |
1310 | SAVESPTR(PL_compcv); |
1311 | |
1312 | cv = PL_compcv = (CV*)NEWSV(1104, 0); |
1313 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
1314 | CvFLAGS(cv) = CvFLAGS(proto) & ~CVf_CLONE; |
1315 | CvCLONED_on(cv); |
1316 | |
1317 | #ifdef USE_5005THREADS |
1318 | New(666, CvMUTEXP(cv), 1, perl_mutex); |
1319 | MUTEX_INIT(CvMUTEXP(cv)); |
1320 | CvOWNER(cv) = 0; |
1321 | #endif /* USE_5005THREADS */ |
1322 | #ifdef USE_ITHREADS |
1323 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) |
1324 | : savepv(CvFILE(proto)); |
1325 | #else |
1326 | CvFILE(cv) = CvFILE(proto); |
1327 | #endif |
1328 | CvGV(cv) = CvGV(proto); |
1329 | CvSTASH(cv) = CvSTASH(proto); |
1330 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
1331 | CvSTART(cv) = CvSTART(proto); |
1332 | if (outside) |
1333 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
1334 | |
1335 | if (SvPOK(proto)) |
1336 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); |
1337 | |
1338 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); |
1339 | |
1340 | for (ix = fname; ix >= 0; ix--) |
1341 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); |
1342 | |
1343 | av_fill(PL_comppad, fpad); |
1344 | PL_curpad = AvARRAY(PL_comppad); |
1345 | |
1346 | for (ix = fpad; ix > 0; ix--) { |
1347 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
1348 | if (namesv && namesv != &PL_sv_undef) { |
1349 | char *name = SvPVX(namesv); /* XXX */ |
1350 | if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */ |
1351 | I32 off = pad_findlex(name, ix, SvIVX(namesv), |
1352 | CvOUTSIDE(cv), cxstack_ix, 0, 0); |
1353 | if (!off) |
1354 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); |
1355 | else if (off != ix) |
1356 | Perl_croak(aTHX_ "panic: cv_clone: %s", name); |
1357 | } |
1358 | else { /* our own lexical */ |
1359 | SV* sv; |
1360 | if (*name == '&') { |
1361 | /* anon code -- we'll come back for it */ |
1362 | sv = SvREFCNT_inc(ppad[ix]); |
1363 | } |
1364 | else if (*name == '@') |
1365 | sv = (SV*)newAV(); |
1366 | else if (*name == '%') |
1367 | sv = (SV*)newHV(); |
1368 | else |
1369 | sv = NEWSV(0, 0); |
1370 | if (!SvPADBUSY(sv)) |
1371 | SvPADMY_on(sv); |
1372 | PL_curpad[ix] = sv; |
1373 | } |
1374 | } |
1375 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { |
1376 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); |
1377 | } |
1378 | else { |
1379 | SV* sv = NEWSV(0, 0); |
1380 | SvPADTMP_on(sv); |
1381 | PL_curpad[ix] = sv; |
1382 | } |
1383 | } |
1384 | |
1385 | /* Now that vars are all in place, clone nested closures. */ |
1386 | |
1387 | for (ix = fpad; ix > 0; ix--) { |
1388 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
1389 | if (namesv |
1390 | && namesv != &PL_sv_undef |
1391 | && !(SvFLAGS(namesv) & SVf_FAKE) |
1392 | && *SvPVX(namesv) == '&' |
1393 | && CvCLONE(ppad[ix])) |
1394 | { |
1395 | CV *kid = cv_clone2((CV*)ppad[ix], cv); |
1396 | SvREFCNT_dec(ppad[ix]); |
1397 | CvCLONE_on(kid); |
1398 | SvPADMY_on(kid); |
1399 | PL_curpad[ix] = (SV*)kid; |
1400 | } |
1401 | } |
1402 | |
1403 | DEBUG_Xv( |
1404 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); |
1405 | cv_dump(outside, "Outside"); |
1406 | cv_dump(proto, "Proto"); |
1407 | cv_dump(cv, "To"); |
1408 | ); |
1409 | |
1410 | LEAVE; |
1411 | |
1412 | if (CvCONST(cv)) { |
1413 | SV* const_sv = op_const_sv(CvSTART(cv), cv); |
1414 | assert(const_sv); |
1415 | /* constant sub () { $x } closing over $x - see lib/constant.pm */ |
1416 | SvREFCNT_dec(cv); |
1417 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); |
1418 | } |
1419 | |
1420 | return cv; |
1421 | } |
1422 | |
1423 | |
1424 | /* |
1425 | =for apidoc pad_fixup_inner_anons |
1426 | |
1427 | For any anon CVs in the pad, change CvOUTSIDE of that CV from |
1428 | old_cv to new_cv if necessary. |
1429 | |
1430 | =cut |
1431 | */ |
1432 | |
1433 | void |
1434 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) |
1435 | { |
1436 | I32 ix; |
1437 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
1438 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
1439 | SV **namepad = AvARRAY(comppad_name); |
1440 | SV **curpad = AvARRAY(comppad); |
1441 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
1442 | SV *namesv = namepad[ix]; |
1443 | if (namesv && namesv != &PL_sv_undef |
1444 | && *SvPVX(namesv) == '&') |
1445 | { |
1446 | CV *innercv = (CV*)curpad[ix]; |
1447 | if (CvOUTSIDE(innercv) == old_cv) { |
1448 | CvOUTSIDE(innercv) = new_cv; |
1449 | if (!CvANON(innercv) || CvCLONED(innercv)) { |
1450 | (void)SvREFCNT_inc(new_cv); |
1451 | SvREFCNT_dec(old_cv); |
1452 | } |
1453 | } |
1454 | } |
1455 | } |
1456 | } |
1457 | |
1458 | /* |
1459 | =for apidoc pad_push |
1460 | |
1461 | Push a new pad frame onto the padlist, unless there's already a pad at |
1462 | this depth, in which case don't bother creating a new one. |
1463 | If has_args is true, give the new pad an @_ in slot zero. |
1464 | |
1465 | =cut |
1466 | */ |
1467 | |
1468 | void |
1469 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) |
1470 | { |
1471 | if (depth <= AvFILLp(padlist)) |
1472 | return; |
1473 | |
1474 | { |
1475 | SV** svp = AvARRAY(padlist); |
1476 | AV *newpad = newAV(); |
1477 | SV **oldpad = AvARRAY(svp[depth-1]); |
1478 | I32 ix = AvFILLp((AV*)svp[1]); |
1479 | I32 names_fill = AvFILLp((AV*)svp[0]); |
1480 | SV** names = AvARRAY(svp[0]); |
1481 | SV* sv; |
1482 | for ( ;ix > 0; ix--) { |
1483 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
1484 | char *name = SvPVX(names[ix]); |
1485 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || *name == '&') { |
1486 | /* outer lexical or anon code */ |
1487 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
1488 | } |
1489 | else { /* our own lexical */ |
1490 | if (*name == '@') |
1491 | av_store(newpad, ix, sv = (SV*)newAV()); |
1492 | else if (*name == '%') |
1493 | av_store(newpad, ix, sv = (SV*)newHV()); |
1494 | else |
1495 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1496 | SvPADMY_on(sv); |
1497 | } |
1498 | } |
1499 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
1500 | av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix])); |
1501 | } |
1502 | else { |
1503 | /* save temporaries on recursion? */ |
1504 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1505 | SvPADTMP_on(sv); |
1506 | } |
1507 | } |
1508 | if (has_args) { |
1509 | AV* av = newAV(); |
1510 | av_extend(av, 0); |
1511 | av_store(newpad, 0, (SV*)av); |
1512 | AvFLAGS(av) = AVf_REIFY; |
1513 | } |
1514 | av_store(padlist, depth, (SV*)newpad); |
1515 | AvFILLp(padlist) = depth; |
1516 | } |
1517 | } |