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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) { |
122 | SAVEVPTR(PL_curpad); |
123 | SAVESPTR(PL_comppad); |
124 | SAVESPTR(PL_comppad_name); |
125 | if (! (flags & padnew_CLONE)) { |
126 | SAVEI32(PL_padix); |
127 | SAVEI32(PL_comppad_name_fill); |
128 | SAVEI32(PL_min_intro_pending); |
129 | SAVEI32(PL_max_intro_pending); |
130 | if (flags & padnew_SAVESUB) { |
131 | SAVEI32(PL_pad_reset_pending); |
132 | } |
133 | } |
134 | } |
135 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be |
136 | * saved - check at some pt that this is okay */ |
137 | |
138 | /* ... create new pad ... */ |
139 | |
140 | padlist = newAV(); |
141 | padname = newAV(); |
142 | pad = newAV(); |
143 | |
144 | if (flags & padnew_CLONE) { |
145 | /* XXX DAPM I dont know why cv_clone needs it |
146 | * doing differently yet - perhaps this separate branch can be |
147 | * dispensed with eventually ??? |
148 | */ |
149 | |
150 | a0 = newAV(); /* will be @_ */ |
151 | av_extend(a0, 0); |
152 | av_store(pad, 0, (SV*)a0); |
153 | AvFLAGS(a0) = AVf_REIFY; |
154 | } |
155 | else { |
156 | #ifdef USE_5005THREADS |
157 | av_store(padname, 0, newSVpvn("@_", 2)); |
158 | a0 = newAV(); |
159 | SvPADMY_on((SV*)a0); /* XXX Needed? */ |
160 | av_store(pad, 0, (SV*)a0); |
161 | #else |
162 | av_store(pad, 0, Nullsv); |
163 | #endif /* USE_THREADS */ |
164 | } |
165 | |
166 | AvREAL_off(padlist); |
167 | av_store(padlist, 0, (SV*)padname); |
168 | av_store(padlist, 1, (SV*)pad); |
169 | |
170 | /* ... then update state variables */ |
171 | |
172 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); |
173 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); |
174 | PL_curpad = AvARRAY(PL_comppad); |
175 | |
176 | if (! (flags & padnew_CLONE)) { |
177 | PL_comppad_name_fill = 0; |
178 | PL_min_intro_pending = 0; |
179 | PL_padix = 0; |
180 | } |
181 | |
182 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
183 | "Pad 0x%"UVxf"[0x%"UVxf"] new: padlist=0x%"UVxf |
184 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
185 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(padlist), |
186 | PTR2UV(padname), (UV)flags |
187 | ) |
188 | ); |
189 | |
190 | return (PADLIST*)padlist; |
191 | } |
192 | |
193 | /* |
194 | =for apidoc pad_undef |
195 | |
196 | Free the padlist associated with a CV. |
197 | If parts of it happen to be current, we null the relevant |
198 | PL_*pad* global vars so that we don't have any dangling references left. |
199 | We also repoint the CvOUTSIDE of any about-to-be-orphaned |
200 | inner subs to outercv. |
201 | |
202 | =cut |
203 | */ |
204 | |
205 | void |
206 | Perl_pad_undef(pTHX_ CV* cv, CV* outercv) |
207 | { |
208 | I32 ix; |
209 | PADLIST *padlist = CvPADLIST(cv); |
210 | |
211 | if (!padlist) |
212 | return; |
213 | if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */ |
214 | return; |
215 | |
216 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
217 | "Pad undef: padlist=0x%"UVxf"\n" , PTR2UV(padlist)) |
218 | ); |
219 | |
220 | /* pads may be cleared out already during global destruction */ |
221 | if ((CvEVAL(cv) && !CvGV(cv) /* is this eval"" ? */ |
222 | && !PL_dirty) || CvSPECIAL(cv)) |
223 | { |
224 | /* XXX DAPM the following code is very similar to |
225 | * pad_fixup_inner_anons(). Merge??? */ |
226 | |
227 | /* inner references to eval's cv must be fixed up */ |
228 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
229 | SV **namepad = AvARRAY(comppad_name); |
230 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
231 | SV **curpad = AvARRAY(comppad); |
232 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
233 | SV *namesv = namepad[ix]; |
234 | if (namesv && namesv != &PL_sv_undef |
235 | && *SvPVX(namesv) == '&' |
236 | && ix <= AvFILLp(comppad)) |
237 | { |
238 | CV *innercv = (CV*)curpad[ix]; |
239 | if (innercv && SvTYPE(innercv) == SVt_PVCV |
240 | && CvOUTSIDE(innercv) == cv) |
241 | { |
242 | CvOUTSIDE(innercv) = outercv; |
243 | if (!CvANON(innercv) || CvCLONED(innercv)) { |
244 | (void)SvREFCNT_inc(outercv); |
245 | if (SvREFCNT(cv)) |
246 | SvREFCNT_dec(cv); |
247 | } |
248 | } |
249 | } |
250 | } |
251 | } |
252 | ix = AvFILLp(padlist); |
253 | while (ix >= 0) { |
254 | SV* sv = AvARRAY(padlist)[ix--]; |
255 | if (!sv) |
256 | continue; |
257 | if (sv == (SV*)PL_comppad_name) |
258 | PL_comppad_name = Nullav; |
259 | else if (sv == (SV*)PL_comppad) { |
260 | PL_comppad = Nullav; |
261 | PL_curpad = Null(SV**); |
262 | } |
263 | SvREFCNT_dec(sv); |
264 | } |
265 | SvREFCNT_dec((SV*)CvPADLIST(cv)); |
266 | CvPADLIST(cv) = Null(PADLIST*); |
267 | } |
268 | |
269 | |
270 | |
271 | |
272 | /* |
273 | =for apidoc pad_add_name |
274 | |
275 | Create a new name in the current pad at the specified offset. |
276 | If C<typestash> is valid, the name is for a typed lexical; set the |
277 | name's stash to that value. |
278 | If C<ourstash> is valid, it's an our lexical, set the name's |
279 | GvSTASH to that value |
280 | |
281 | Also, if the name is @.. or %.., create a new array or hash for that slot |
282 | |
283 | If fake, it means we're cloning an existing entry |
284 | |
285 | =cut |
286 | */ |
287 | |
288 | /* |
289 | * XXX DAPM this doesn't seem the right place to create a new array/hash. |
290 | * Whatever we do, we should be consistent - create scalars too, and |
291 | * create even if fake. Really need to integrate better the whole entry |
292 | * creation business - when + where does the name and value get created? |
293 | */ |
294 | |
295 | PADOFFSET |
296 | Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) |
297 | { |
298 | PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
299 | SV* namesv = NEWSV(1102, 0); |
300 | U32 min, max; |
301 | |
302 | if (fake) { |
303 | min = PL_curcop->cop_seq; |
304 | max = PAD_MAX; |
305 | } |
306 | else { |
307 | /* not yet introduced */ |
308 | min = PAD_MAX; |
309 | max = 0; |
310 | } |
311 | |
312 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
313 | "Pad addname: %ld \"%s\", (%lu,%lu)%s\n", |
314 | (long)offset, name, (unsigned long)min, (unsigned long)max, |
315 | (fake ? " FAKE" : "") |
316 | ) |
317 | ); |
318 | |
319 | sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); |
320 | sv_setpv(namesv, name); |
321 | |
322 | if (typestash) { |
323 | SvFLAGS(namesv) |= SVpad_TYPED; |
324 | SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) typestash); |
325 | } |
326 | if (ourstash) { |
327 | SvFLAGS(namesv) |= SVpad_OUR; |
328 | GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash); |
329 | } |
330 | |
331 | av_store(PL_comppad_name, offset, namesv); |
332 | SvNVX(namesv) = (NV)min; |
333 | SvIVX(namesv) = max; |
334 | if (fake) |
335 | SvFAKE_on(namesv); |
336 | else { |
337 | if (!PL_min_intro_pending) |
338 | PL_min_intro_pending = offset; |
339 | PL_max_intro_pending = offset; |
340 | if (*name == '@') |
341 | av_store(PL_comppad, offset, (SV*)newAV()); |
342 | else if (*name == '%') |
343 | av_store(PL_comppad, offset, (SV*)newHV()); |
344 | SvPADMY_on(PL_curpad[offset]); |
345 | } |
346 | |
347 | return offset; |
348 | } |
349 | |
350 | |
351 | |
352 | |
353 | /* |
354 | =for apidoc pad_alloc |
355 | |
356 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto |
357 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards |
358 | for a slot which has no name and and no active value. |
359 | |
360 | =cut |
361 | */ |
362 | |
363 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), |
364 | * or at least rationalise ??? */ |
365 | |
366 | |
367 | PADOFFSET |
368 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) |
369 | { |
370 | SV *sv; |
371 | I32 retval; |
372 | |
373 | if (AvARRAY(PL_comppad) != PL_curpad) |
374 | Perl_croak(aTHX_ "panic: pad_alloc"); |
375 | if (PL_pad_reset_pending) |
376 | pad_reset(); |
377 | if (tmptype & SVs_PADMY) { |
378 | do { |
379 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
380 | } while (SvPADBUSY(sv)); /* need a fresh one */ |
381 | retval = AvFILLp(PL_comppad); |
382 | } |
383 | else { |
384 | SV **names = AvARRAY(PL_comppad_name); |
385 | SSize_t names_fill = AvFILLp(PL_comppad_name); |
386 | for (;;) { |
387 | /* |
388 | * "foreach" index vars temporarily become aliases to non-"my" |
389 | * values. Thus we must skip, not just pad values that are |
390 | * marked as current pad values, but also those with names. |
391 | */ |
392 | /* HVDS why copy to sv here? we don't seem to use it */ |
393 | if (++PL_padix <= names_fill && |
394 | (sv = names[PL_padix]) && sv != &PL_sv_undef) |
395 | continue; |
396 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); |
397 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && |
398 | !IS_PADGV(sv) && !IS_PADCONST(sv)) |
399 | break; |
400 | } |
401 | retval = PL_padix; |
402 | } |
403 | SvFLAGS(sv) |= tmptype; |
404 | PL_curpad = AvARRAY(PL_comppad); |
405 | |
406 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
407 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", |
408 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, |
409 | PL_op_name[optype])); |
410 | return (PADOFFSET)retval; |
411 | } |
412 | |
413 | /* |
414 | =for apidoc pad_add_anon |
415 | |
416 | Add an anon code entry to the current compiling pad |
417 | |
418 | =cut |
419 | */ |
420 | |
421 | PADOFFSET |
422 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) |
423 | { |
424 | PADOFFSET ix; |
425 | SV* name; |
426 | |
427 | name = NEWSV(1106, 0); |
428 | sv_upgrade(name, SVt_PVNV); |
429 | sv_setpvn(name, "&", 1); |
430 | SvIVX(name) = -1; |
431 | SvNVX(name) = 1; |
432 | ix = pad_alloc(op_type, SVs_PADMY); |
433 | av_store(PL_comppad_name, ix, name); |
434 | av_store(PL_comppad, ix, sv); |
435 | SvPADMY_on(sv); |
436 | return ix; |
437 | } |
438 | |
439 | |
440 | |
441 | /* |
442 | =for apidoc pad_check_dup |
443 | |
444 | Check for duplicate declarations: report any of: |
445 | * a my in the current scope with the same name; |
446 | * an our (anywhere in the pad) with the same name and the same stash |
447 | as C<ourstash> |
448 | C<is_our> indicates that the name to check is an 'our' declaration |
449 | |
450 | =cut |
451 | */ |
452 | |
453 | /* XXX DAPM integrate this into pad_add_name ??? */ |
454 | |
455 | void |
456 | Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) |
457 | { |
458 | SV **svp, *sv; |
459 | PADOFFSET top, off; |
460 | |
461 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) |
462 | return; /* nothing to check */ |
463 | |
464 | svp = AvARRAY(PL_comppad_name); |
465 | top = AvFILLp(PL_comppad_name); |
466 | /* check the current scope */ |
467 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same |
468 | * type ? */ |
469 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { |
470 | if ((sv = svp[off]) |
471 | && sv != &PL_sv_undef |
472 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
473 | && (!is_our |
474 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) |
475 | && strEQ(name, SvPVX(sv))) |
476 | { |
477 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
478 | "\"%s\" variable %s masks earlier declaration in same %s", |
479 | (is_our ? "our" : "my"), |
480 | name, |
481 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); |
482 | --off; |
483 | break; |
484 | } |
485 | } |
486 | /* check the rest of the pad */ |
487 | if (is_our) { |
488 | do { |
489 | if ((sv = svp[off]) |
490 | && sv != &PL_sv_undef |
491 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
492 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) |
493 | && strEQ(name, SvPVX(sv))) |
494 | { |
495 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
496 | "\"our\" variable %s redeclared", name); |
497 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
498 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); |
499 | break; |
500 | } |
501 | } while ( off-- > 0 ); |
502 | } |
503 | } |
504 | |
505 | |
506 | |
507 | /* |
508 | =for apidoc pad_findmy |
509 | |
510 | Given a lexical name, try to find its offset, first in the current pad, |
511 | or failing that, in the pads of any lexically enclosing subs (including |
512 | the complications introduced by eval). If the name is found in an outer pad, |
513 | then a fake entry is added to the current pad. |
514 | Returns the offset in the current pad, or NOT_IN_PAD on failure. |
515 | |
516 | =cut |
517 | */ |
518 | |
519 | PADOFFSET |
520 | Perl_pad_findmy(pTHX_ char *name) |
521 | { |
522 | I32 off; |
523 | I32 pendoff = 0; |
524 | SV *sv; |
525 | SV **svp = AvARRAY(PL_comppad_name); |
526 | U32 seq = PL_cop_seqmax; |
527 | PERL_CONTEXT *cx; |
528 | CV *outside; |
529 | |
530 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad findmy: \"%s\"\n", name)); |
531 | |
532 | #ifdef USE_5005THREADS |
533 | /* |
534 | * Special case to get lexical (and hence per-thread) @_. |
535 | * XXX I need to find out how to tell at parse-time whether use |
536 | * of @_ should refer to a lexical (from a sub) or defgv (global |
537 | * scope and maybe weird sub-ish things like formats). See |
538 | * startsub in perly.y. It's possible that @_ could be lexical |
539 | * (at least from subs) even in non-threaded perl. |
540 | */ |
541 | if (strEQ(name, "@_")) |
542 | return 0; /* success. (NOT_IN_PAD indicates failure) */ |
543 | #endif /* USE_5005THREADS */ |
544 | |
545 | /* The one we're looking for is probably just before comppad_name_fill. */ |
546 | for (off = AvFILLp(PL_comppad_name); off > 0; off--) { |
547 | if ((sv = svp[off]) && |
548 | sv != &PL_sv_undef && |
549 | (!SvIVX(sv) || |
550 | (seq <= (U32)SvIVX(sv) && |
551 | seq > (U32)I_32(SvNVX(sv)))) && |
552 | strEQ(SvPVX(sv), name)) |
553 | { |
554 | if (SvIVX(sv) || SvFLAGS(sv) & SVpad_OUR) |
555 | return (PADOFFSET)off; |
556 | pendoff = off; /* this pending def. will override import */ |
557 | } |
558 | } |
559 | |
560 | outside = CvOUTSIDE(PL_compcv); |
561 | |
562 | /* Check if if we're compiling an eval'', and adjust seq to be the |
563 | * eval's seq number. This depends on eval'' having a non-null |
564 | * CvOUTSIDE() while it is being compiled. The eval'' itself is |
565 | * identified by CvEVAL being true and CvGV being null. */ |
566 | if (outside && CvEVAL(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) { |
567 | cx = &cxstack[cxstack_ix]; |
568 | if (CxREALEVAL(cx)) |
569 | seq = cx->blk_oldcop->cop_seq; |
570 | } |
571 | |
572 | /* See if it's in a nested scope */ |
573 | off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0, 0); |
574 | if (!off) /* pad_findlex returns 0 for failure...*/ |
575 | return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */ |
576 | |
577 | /* If there is a pending local definition, this new alias must die */ |
578 | if (pendoff) |
579 | SvIVX(AvARRAY(PL_comppad_name)[off]) = seq; |
580 | return off; |
581 | } |
582 | |
583 | |
584 | |
585 | /* |
586 | =for apidoc pad_findlex |
587 | |
588 | Find a named lexical anywhere in a chain of nested pads. Add fake entries |
589 | in the inner pads if its found in an outer one. |
590 | |
591 | If flags == FINDLEX_NOSEARCH we don't bother searching outer contexts. |
592 | |
593 | =cut |
594 | */ |
595 | |
596 | #define FINDLEX_NOSEARCH 1 /* don't search outer contexts */ |
597 | |
598 | STATIC PADOFFSET |
599 | S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, U32 seq, CV* startcv, |
600 | I32 cx_ix, I32 saweval, U32 flags) |
601 | { |
602 | CV *cv; |
603 | I32 off; |
604 | SV *sv; |
605 | register I32 i; |
606 | register PERL_CONTEXT *cx; |
607 | |
608 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
609 | "Pad findlex: \"%s\" off=%ld seq=%lu cv=0x%"UVxf |
610 | " ix=%ld saweval=%d flags=%lu\n", |
611 | name, (long)newoff, (unsigned long)seq, PTR2UV(startcv), |
612 | (long)cx_ix, (int)saweval, (unsigned long)flags |
613 | ) |
614 | ); |
615 | |
616 | for (cv = startcv; cv; cv = CvOUTSIDE(cv)) { |
617 | AV *curlist = CvPADLIST(cv); |
618 | SV **svp = av_fetch(curlist, 0, FALSE); |
619 | AV *curname; |
620 | |
621 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
622 | " searching: cv=0x%"UVxf"\n", PTR2UV(cv)) |
623 | ); |
624 | |
625 | if (!svp || *svp == &PL_sv_undef) |
626 | continue; |
627 | curname = (AV*)*svp; |
628 | svp = AvARRAY(curname); |
629 | for (off = AvFILLp(curname); off > 0; off--) { |
630 | I32 depth; |
631 | AV *oldpad; |
632 | SV *oldsv; |
633 | |
634 | if ( ! ( |
635 | (sv = svp[off]) && |
636 | sv != &PL_sv_undef && |
637 | seq <= (U32)SvIVX(sv) && |
638 | seq > (U32)I_32(SvNVX(sv)) && |
639 | strEQ(SvPVX(sv), name)) |
640 | ) |
641 | continue; |
642 | |
643 | depth = CvDEPTH(cv); |
644 | if (!depth) { |
645 | if (newoff) { |
646 | if (SvFAKE(sv)) |
647 | continue; |
648 | return 0; /* don't clone from inactive stack frame */ |
649 | } |
650 | depth = 1; |
651 | } |
652 | |
653 | oldpad = (AV*)AvARRAY(curlist)[depth]; |
654 | oldsv = *av_fetch(oldpad, off, TRUE); |
655 | |
656 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
657 | " matched: offset %ld" |
658 | " %s(%lu,%lu), sv=0x%"UVxf"\n", |
659 | (long)off, |
660 | SvFAKE(sv) ? "FAKE " : "", |
661 | (unsigned long)I_32(SvNVX(sv)), |
662 | (unsigned long)SvIVX(sv), |
663 | PTR2UV(oldsv) |
664 | ) |
665 | ); |
666 | |
667 | if (!newoff) { /* Not a mere clone operation. */ |
668 | newoff = pad_add_name( |
669 | SvPVX(sv), |
670 | (SvFLAGS(sv) & SVpad_TYPED) ? SvSTASH(sv) : Nullhv, |
671 | (SvFLAGS(sv) & SVpad_OUR) ? GvSTASH(sv) : Nullhv, |
672 | 1 /* fake */ |
673 | ); |
674 | |
675 | if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) { |
676 | /* "It's closures all the way down." */ |
677 | CvCLONE_on(PL_compcv); |
678 | if (cv == startcv) { |
679 | if (CvANON(PL_compcv)) |
680 | oldsv = Nullsv; /* no need to keep ref */ |
681 | } |
682 | else { |
683 | CV *bcv; |
684 | for (bcv = startcv; |
685 | bcv && bcv != cv && !CvCLONE(bcv); |
686 | bcv = CvOUTSIDE(bcv)) |
687 | { |
688 | if (CvANON(bcv)) { |
689 | /* install the missing pad entry in intervening |
690 | * nested subs and mark them cloneable. */ |
691 | AV *ocomppad_name = PL_comppad_name; |
692 | AV *ocomppad = PL_comppad; |
693 | SV **ocurpad = PL_curpad; |
694 | AV *padlist = CvPADLIST(bcv); |
695 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
696 | PL_comppad = (AV*)AvARRAY(padlist)[1]; |
697 | PL_curpad = AvARRAY(PL_comppad); |
698 | pad_add_name( |
699 | SvPVX(sv), |
700 | (SvFLAGS(sv) & SVpad_TYPED) |
701 | ? SvSTASH(sv) : Nullhv, |
702 | (SvFLAGS(sv) & SVpad_OUR) |
703 | ? GvSTASH(sv) : Nullhv, |
704 | 1 /* fake */ |
705 | ); |
706 | |
707 | PL_comppad_name = ocomppad_name; |
708 | PL_comppad = ocomppad; |
709 | PL_curpad = ocurpad; |
710 | CvCLONE_on(bcv); |
711 | } |
712 | else { |
713 | if (ckWARN(WARN_CLOSURE) |
714 | && !CvUNIQUE(bcv) && !CvUNIQUE(cv)) |
715 | { |
716 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
717 | "Variable \"%s\" may be unavailable", |
718 | name); |
719 | } |
720 | break; |
721 | } |
722 | } |
723 | } |
724 | } |
725 | else if (!CvUNIQUE(PL_compcv)) { |
726 | if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv) |
727 | && !(SvFLAGS(sv) & SVpad_OUR)) |
728 | { |
729 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
730 | "Variable \"%s\" will not stay shared", name); |
731 | } |
732 | } |
733 | } |
734 | av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv)); |
735 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
736 | "Pad findlex: set offset %ld to sv 0x%"UVxf"\n", |
737 | (long)newoff, PTR2UV(oldsv) |
738 | ) |
739 | ); |
740 | return newoff; |
741 | } |
742 | } |
743 | |
744 | if (flags & FINDLEX_NOSEARCH) |
745 | return 0; |
746 | |
747 | /* Nothing in current lexical context--try eval's context, if any. |
748 | * This is necessary to let the perldb get at lexically scoped variables. |
749 | * XXX This will also probably interact badly with eval tree caching. |
750 | */ |
751 | |
752 | for (i = cx_ix; i >= 0; i--) { |
753 | cx = &cxstack[i]; |
754 | switch (CxTYPE(cx)) { |
755 | default: |
756 | if (i == 0 && saweval) { |
757 | return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval, 0); |
758 | } |
759 | break; |
760 | case CXt_EVAL: |
761 | switch (cx->blk_eval.old_op_type) { |
762 | case OP_ENTEREVAL: |
763 | if (CxREALEVAL(cx)) { |
764 | PADOFFSET off; |
765 | saweval = i; |
766 | seq = cxstack[i].blk_oldcop->cop_seq; |
767 | startcv = cxstack[i].blk_eval.cv; |
768 | if (startcv && CvOUTSIDE(startcv)) { |
769 | off = pad_findlex(name, newoff, seq, CvOUTSIDE(startcv), |
770 | i - 1, saweval, 0); |
771 | if (off) /* continue looking if not found here */ |
772 | return off; |
773 | } |
774 | } |
775 | break; |
776 | case OP_DOFILE: |
777 | case OP_REQUIRE: |
778 | /* require/do must have their own scope */ |
779 | return 0; |
780 | } |
781 | break; |
782 | case CXt_FORMAT: |
783 | case CXt_SUB: |
784 | if (!saweval) |
785 | return 0; |
786 | cv = cx->blk_sub.cv; |
787 | if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */ |
788 | saweval = i; /* so we know where we were called from */ |
789 | seq = cxstack[i].blk_oldcop->cop_seq; |
790 | continue; |
791 | } |
792 | return pad_findlex(name, newoff, seq, cv, i - 1, saweval, FINDLEX_NOSEARCH); |
793 | } |
794 | } |
795 | |
796 | return 0; |
797 | } |
798 | |
799 | |
800 | /* |
801 | =for apidoc pad_sv |
802 | |
803 | Get the value at offset po in the current pad. |
804 | Use macro PAD_SV instead of calling this function directly. |
805 | |
806 | =cut |
807 | */ |
808 | |
809 | |
810 | SV * |
811 | Perl_pad_sv(pTHX_ PADOFFSET po) |
812 | { |
813 | #ifdef DEBUGGING |
814 | /* for display purposes, try to guess the AV corresponding to |
815 | * Pl_curpad */ |
816 | AV *cp = PL_comppad; |
817 | if (cp && AvARRAY(cp) != PL_curpad) |
818 | cp = Nullav; |
819 | #endif |
820 | |
821 | #ifndef USE_5005THREADS |
822 | if (!po) |
823 | Perl_croak(aTHX_ "panic: pad_sv po"); |
824 | #endif |
825 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
826 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", |
827 | PTR2UV(cp), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
828 | ); |
829 | return PL_curpad[po]; |
830 | } |
831 | |
832 | |
833 | /* |
834 | =for apidoc pad_setsv |
835 | |
836 | Set the entry at offset po in the current pad to sv. |
837 | Use the macro PAD_SETSV() rather than calling this function directly. |
838 | |
839 | =cut |
840 | */ |
841 | |
842 | #ifdef DEBUGGING |
843 | void |
844 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) |
845 | { |
846 | /* for display purposes, try to guess the AV corresponding to |
847 | * Pl_curpad */ |
848 | AV *cp = PL_comppad; |
849 | if (cp && AvARRAY(cp) != PL_curpad) |
850 | cp = Nullav; |
851 | |
852 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
853 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", |
854 | PTR2UV(cp), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
855 | ); |
856 | PL_curpad[po] = sv; |
857 | } |
858 | #endif |
859 | |
860 | |
861 | |
862 | /* |
863 | =for apidoc pad_block_start |
864 | |
865 | Update the pad compilation state variables on entry to a new block |
866 | |
867 | =cut |
868 | */ |
869 | |
870 | /* XXX DAPM perhaps: |
871 | * - integrate this in general state-saving routine ??? |
872 | * - combine with the state-saving going on in pad_new ??? |
873 | * - introduce a new SAVE type that does all this in one go ? |
874 | */ |
875 | |
876 | void |
877 | Perl_pad_block_start(pTHX_ int full) |
878 | { |
879 | SAVEI32(PL_comppad_name_floor); |
880 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); |
881 | if (full) |
882 | PL_comppad_name_fill = PL_comppad_name_floor; |
883 | if (PL_comppad_name_floor < 0) |
884 | PL_comppad_name_floor = 0; |
885 | SAVEI32(PL_min_intro_pending); |
886 | SAVEI32(PL_max_intro_pending); |
887 | PL_min_intro_pending = 0; |
888 | SAVEI32(PL_comppad_name_fill); |
889 | SAVEI32(PL_padix_floor); |
890 | PL_padix_floor = PL_padix; |
891 | PL_pad_reset_pending = FALSE; |
892 | } |
893 | |
894 | |
895 | /* |
896 | =for apidoc intro_my |
897 | |
898 | "Introduce" my variables to visible status. |
899 | |
900 | =cut |
901 | */ |
902 | |
903 | U32 |
904 | Perl_intro_my(pTHX) |
905 | { |
906 | SV **svp; |
907 | SV *sv; |
908 | I32 i; |
909 | |
910 | if (! PL_min_intro_pending) |
911 | return PL_cop_seqmax; |
912 | |
913 | svp = AvARRAY(PL_comppad_name); |
914 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { |
915 | if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) { |
916 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ |
917 | SvNVX(sv) = (NV)PL_cop_seqmax; |
918 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
919 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", |
920 | (long)i, SvPVX(sv), |
921 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) |
922 | ); |
923 | } |
924 | } |
925 | PL_min_intro_pending = 0; |
926 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ |
927 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
928 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); |
929 | |
930 | return PL_cop_seqmax++; |
931 | } |
932 | |
933 | /* |
934 | =for apidoc pad_leavemy |
935 | |
936 | Cleanup at end of scope during compilation: set the max seq number for |
937 | lexicals in this scope and warn of any lexicals that never got introduced. |
938 | |
939 | =cut |
940 | */ |
941 | |
942 | void |
943 | Perl_pad_leavemy(pTHX) |
944 | { |
945 | I32 off; |
946 | SV **svp = AvARRAY(PL_comppad_name); |
947 | SV *sv; |
948 | |
949 | PL_pad_reset_pending = FALSE; |
950 | |
951 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
952 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { |
953 | if ((sv = svp[off]) && sv != &PL_sv_undef && ckWARN_d(WARN_INTERNAL)) |
954 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
955 | "%s never introduced", SvPVX(sv)); |
956 | } |
957 | } |
958 | /* "Deintroduce" my variables that are leaving with this scope. */ |
959 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { |
960 | if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX) { |
961 | SvIVX(sv) = PL_cop_seqmax; |
962 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
963 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", |
964 | (long)off, SvPVX(sv), |
965 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) |
966 | ); |
967 | } |
968 | } |
969 | PL_cop_seqmax++; |
970 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
971 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); |
972 | } |
973 | |
974 | |
975 | /* |
976 | =for apidoc pad_swipe |
977 | |
978 | Abandon the tmp in the current pad at offset po and replace with a |
979 | new one. |
980 | |
981 | =cut |
982 | */ |
983 | |
984 | void |
985 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) |
986 | { |
987 | if (!PL_curpad) |
988 | return; |
989 | if (AvARRAY(PL_comppad) != PL_curpad) |
990 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); |
991 | if (!po) |
992 | Perl_croak(aTHX_ "panic: pad_swipe po"); |
993 | |
994 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
995 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", |
996 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); |
997 | |
998 | if (PL_curpad[po]) |
999 | SvPADTMP_off(PL_curpad[po]); |
1000 | if (refadjust) |
1001 | SvREFCNT_dec(PL_curpad[po]); |
1002 | |
1003 | PL_curpad[po] = NEWSV(1107,0); |
1004 | SvPADTMP_on(PL_curpad[po]); |
1005 | if ((I32)po < PL_padix) |
1006 | PL_padix = po - 1; |
1007 | } |
1008 | |
1009 | |
1010 | /* |
1011 | =for apidoc pad_reset |
1012 | |
1013 | Mark all the current temporaries for reuse |
1014 | |
1015 | =cut |
1016 | */ |
1017 | |
1018 | /* XXX pad_reset() is currently disabled because it results in serious bugs. |
1019 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed |
1020 | * on the stack by OPs that use them, there are several ways to get an alias |
1021 | * to a shared TARG. Such an alias will change randomly and unpredictably. |
1022 | * We avoid doing this until we can think of a Better Way. |
1023 | * GSAR 97-10-29 */ |
1024 | void |
1025 | Perl_pad_reset(pTHX) |
1026 | { |
1027 | #ifdef USE_BROKEN_PAD_RESET |
1028 | register I32 po; |
1029 | |
1030 | if (AvARRAY(PL_comppad) != PL_curpad) |
1031 | Perl_croak(aTHX_ "panic: pad_reset curpad"); |
1032 | |
1033 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1034 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", |
1035 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), |
1036 | (long)PL_padix, (long)PL_padix_floor |
1037 | ) |
1038 | ); |
1039 | |
1040 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ |
1041 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1042 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) |
1043 | SvPADTMP_off(PL_curpad[po]); |
1044 | } |
1045 | PL_padix = PL_padix_floor; |
1046 | } |
1047 | #endif |
1048 | PL_pad_reset_pending = FALSE; |
1049 | } |
1050 | |
1051 | |
1052 | /* |
1053 | =for apidoc pad_tidy |
1054 | |
1055 | Tidy up a pad after we've finished compiling it: |
1056 | * remove most stuff from the pads of anonsub prototypes; |
1057 | * give it a @_; |
1058 | * mark tmps as such. |
1059 | |
1060 | =cut |
1061 | */ |
1062 | |
1063 | /* XXX DAPM surely most of this stuff should be done properly |
1064 | * at the right time beforehand, rather than going around afterwards |
1065 | * cleaning up our mistakes ??? |
1066 | */ |
1067 | |
1068 | void |
1069 | Perl_pad_tidy(pTHX_ padtidy_type type) |
1070 | { |
1071 | PADOFFSET ix; |
1072 | |
1073 | /* extend curpad to match namepad */ |
1074 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) |
1075 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); |
1076 | |
1077 | if (type == padtidy_SUBCLONE) { |
1078 | SV **namep = AvARRAY(PL_comppad_name); |
1079 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1080 | SV *namesv; |
1081 | |
1082 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1083 | continue; |
1084 | /* |
1085 | * The only things that a clonable function needs in its |
1086 | * pad are references to outer lexicals and anonymous subs. |
1087 | * The rest are created anew during cloning. |
1088 | */ |
1089 | if (!((namesv = namep[ix]) != Nullsv && |
1090 | namesv != &PL_sv_undef && |
1091 | (SvFAKE(namesv) || |
1092 | *SvPVX(namesv) == '&'))) |
1093 | { |
1094 | SvREFCNT_dec(PL_curpad[ix]); |
1095 | PL_curpad[ix] = Nullsv; |
1096 | } |
1097 | } |
1098 | } |
1099 | else if (type == padtidy_SUB) { |
1100 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ |
1101 | AV *av = newAV(); /* Will be @_ */ |
1102 | av_extend(av, 0); |
1103 | av_store(PL_comppad, 0, (SV*)av); |
1104 | AvFLAGS(av) = AVf_REIFY; |
1105 | } |
1106 | |
1107 | /* XXX DAPM rationalise these two similar branches */ |
1108 | |
1109 | if (type == padtidy_SUB) { |
1110 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1111 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1112 | continue; |
1113 | if (!SvPADMY(PL_curpad[ix])) |
1114 | SvPADTMP_on(PL_curpad[ix]); |
1115 | } |
1116 | } |
1117 | else if (type == padtidy_FORMAT) { |
1118 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1119 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) |
1120 | SvPADTMP_on(PL_curpad[ix]); |
1121 | } |
1122 | } |
1123 | } |
1124 | |
1125 | |
1126 | /* |
1127 | =for apidoc pad_free |
1128 | |
1129 | Free the SV at offet po in the current pad. |
1130 | |
1131 | =cut |
1132 | */ |
1133 | |
1134 | /* XXX DAPM integrate with pad_swipe ???? */ |
1135 | void |
1136 | Perl_pad_free(pTHX_ PADOFFSET po) |
1137 | { |
1138 | if (!PL_curpad) |
1139 | return; |
1140 | if (AvARRAY(PL_comppad) != PL_curpad) |
1141 | Perl_croak(aTHX_ "panic: pad_free curpad"); |
1142 | if (!po) |
1143 | Perl_croak(aTHX_ "panic: pad_free po"); |
1144 | |
1145 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1146 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", |
1147 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) |
1148 | ); |
1149 | |
1150 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { |
1151 | SvPADTMP_off(PL_curpad[po]); |
1152 | #ifdef USE_ITHREADS |
1153 | #ifdef PERL_COPY_ON_WRITE |
1154 | if (SvIsCOW(PL_curpad[po])) { |
1155 | sv_force_normal_flags(PL_curpad[po], SV_COW_DROP_PV); |
1156 | } else |
1157 | #endif |
1158 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
1159 | |
1160 | #endif |
1161 | } |
1162 | if ((I32)po < PL_padix) |
1163 | PL_padix = po - 1; |
1164 | } |
1165 | |
1166 | |
1167 | |
1168 | /* |
1169 | =for apidoc do_dump_pad |
1170 | |
1171 | Dump the contents of a padlist |
1172 | |
1173 | =cut |
1174 | */ |
1175 | |
1176 | void |
1177 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) |
1178 | { |
1179 | AV *pad_name; |
1180 | AV *pad; |
1181 | SV **pname; |
1182 | SV **ppad; |
1183 | SV *namesv; |
1184 | I32 ix; |
1185 | |
1186 | if (!padlist) { |
1187 | return; |
1188 | } |
1189 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); |
1190 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); |
1191 | pname = AvARRAY(pad_name); |
1192 | ppad = AvARRAY(pad); |
1193 | Perl_dump_indent(aTHX_ level, file, |
1194 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", |
1195 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) |
1196 | ); |
1197 | |
1198 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { |
1199 | namesv = pname[ix]; |
1200 | if (namesv && namesv == &PL_sv_undef) { |
1201 | namesv = Nullsv; |
1202 | } |
1203 | if (namesv) { |
1204 | Perl_dump_indent(aTHX_ level+1, file, |
1205 | "%2d. 0x%"UVxf"<%lu> %s (%lu,%lu) \"%s\"\n", |
1206 | (int) ix, |
1207 | PTR2UV(ppad[ix]), |
1208 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
1209 | SvFAKE(namesv) ? "FAKE" : " ", |
1210 | (unsigned long)I_32(SvNVX(namesv)), |
1211 | (unsigned long)SvIVX(namesv), |
1212 | SvPVX(namesv) |
1213 | ); |
1214 | } |
1215 | else if (full) { |
1216 | Perl_dump_indent(aTHX_ level+1, file, |
1217 | "%2d. 0x%"UVxf"<%lu>\n", |
1218 | (int) ix, |
1219 | PTR2UV(ppad[ix]), |
1220 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) |
1221 | ); |
1222 | } |
1223 | } |
1224 | } |
1225 | |
1226 | |
1227 | |
1228 | /* |
1229 | =for apidoc cv_dump |
1230 | |
1231 | dump the contents of a CV |
1232 | |
1233 | =cut |
1234 | */ |
1235 | |
1236 | #ifdef DEBUGGING |
1237 | STATIC void |
1238 | S_cv_dump(pTHX_ CV *cv, char *title) |
1239 | { |
1240 | CV *outside = CvOUTSIDE(cv); |
1241 | AV* padlist = CvPADLIST(cv); |
1242 | |
1243 | PerlIO_printf(Perl_debug_log, |
1244 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", |
1245 | title, |
1246 | PTR2UV(cv), |
1247 | (CvANON(cv) ? "ANON" |
1248 | : (cv == PL_main_cv) ? "MAIN" |
1249 | : CvUNIQUE(cv) ? "UNIQUE" |
1250 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), |
1251 | PTR2UV(outside), |
1252 | (!outside ? "null" |
1253 | : CvANON(outside) ? "ANON" |
1254 | : (outside == PL_main_cv) ? "MAIN" |
1255 | : CvUNIQUE(outside) ? "UNIQUE" |
1256 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); |
1257 | |
1258 | PerlIO_printf(Perl_debug_log, |
1259 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); |
1260 | do_dump_pad(1, Perl_debug_log, padlist, 1); |
1261 | } |
1262 | #endif /* DEBUGGING */ |
1263 | |
1264 | |
1265 | |
1266 | |
1267 | |
1268 | /* |
1269 | =for apidoc cv_clone |
1270 | |
1271 | Clone a CV: make a new CV which points to the same code etc, but which |
1272 | has a newly-created pad built by copying the prototype pad and capturing |
1273 | any outer lexicals. |
1274 | |
1275 | =cut |
1276 | */ |
1277 | |
1278 | CV * |
1279 | Perl_cv_clone(pTHX_ CV *proto) |
1280 | { |
1281 | CV *cv; |
1282 | |
1283 | LOCK_CRED_MUTEX; /* XXX create separate mutex */ |
1284 | cv = cv_clone2(proto, CvOUTSIDE(proto)); |
1285 | UNLOCK_CRED_MUTEX; /* XXX create separate mutex */ |
1286 | return cv; |
1287 | } |
1288 | |
1289 | |
1290 | /* XXX DAPM separate out cv and paddish bits ??? |
1291 | * ideally the CV-related stuff shouldn't be in pad.c - how about |
1292 | * a cv.c? */ |
1293 | |
1294 | STATIC CV * |
1295 | S_cv_clone2(pTHX_ CV *proto, CV *outside) |
1296 | { |
1297 | I32 ix; |
1298 | AV* protopadlist = CvPADLIST(proto); |
1299 | AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); |
1300 | AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); |
1301 | SV** pname = AvARRAY(protopad_name); |
1302 | SV** ppad = AvARRAY(protopad); |
1303 | I32 fname = AvFILLp(protopad_name); |
1304 | I32 fpad = AvFILLp(protopad); |
1305 | AV* comppadlist; |
1306 | CV* cv; |
1307 | |
1308 | assert(!CvUNIQUE(proto)); |
1309 | |
1310 | ENTER; |
1311 | SAVESPTR(PL_compcv); |
1312 | |
1313 | cv = PL_compcv = (CV*)NEWSV(1104, 0); |
1314 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
1315 | CvFLAGS(cv) = CvFLAGS(proto) & ~CVf_CLONE; |
1316 | CvCLONED_on(cv); |
1317 | |
1318 | #ifdef USE_5005THREADS |
1319 | New(666, CvMUTEXP(cv), 1, perl_mutex); |
1320 | MUTEX_INIT(CvMUTEXP(cv)); |
1321 | CvOWNER(cv) = 0; |
1322 | #endif /* USE_5005THREADS */ |
1323 | #ifdef USE_ITHREADS |
1324 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) |
1325 | : savepv(CvFILE(proto)); |
1326 | #else |
1327 | CvFILE(cv) = CvFILE(proto); |
1328 | #endif |
1329 | CvGV(cv) = CvGV(proto); |
1330 | CvSTASH(cv) = CvSTASH(proto); |
1331 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
1332 | CvSTART(cv) = CvSTART(proto); |
1333 | if (outside) |
1334 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
1335 | |
1336 | if (SvPOK(proto)) |
1337 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); |
1338 | |
1339 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); |
1340 | |
1341 | for (ix = fname; ix >= 0; ix--) |
1342 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); |
1343 | |
1344 | av_fill(PL_comppad, fpad); |
1345 | PL_curpad = AvARRAY(PL_comppad); |
1346 | |
1347 | for (ix = fpad; ix > 0; ix--) { |
1348 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
1349 | if (namesv && namesv != &PL_sv_undef) { |
1350 | char *name = SvPVX(namesv); /* XXX */ |
1351 | if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */ |
1352 | I32 off = pad_findlex(name, ix, SvIVX(namesv), |
1353 | CvOUTSIDE(cv), cxstack_ix, 0, 0); |
1354 | if (!off) |
1355 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); |
1356 | else if (off != ix) |
1357 | Perl_croak(aTHX_ "panic: cv_clone: %s", name); |
1358 | } |
1359 | else { /* our own lexical */ |
1360 | SV* sv; |
1361 | if (*name == '&') { |
1362 | /* anon code -- we'll come back for it */ |
1363 | sv = SvREFCNT_inc(ppad[ix]); |
1364 | } |
1365 | else if (*name == '@') |
1366 | sv = (SV*)newAV(); |
1367 | else if (*name == '%') |
1368 | sv = (SV*)newHV(); |
1369 | else |
1370 | sv = NEWSV(0, 0); |
1371 | if (!SvPADBUSY(sv)) |
1372 | SvPADMY_on(sv); |
1373 | PL_curpad[ix] = sv; |
1374 | } |
1375 | } |
1376 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { |
1377 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); |
1378 | } |
1379 | else { |
1380 | SV* sv = NEWSV(0, 0); |
1381 | SvPADTMP_on(sv); |
1382 | PL_curpad[ix] = sv; |
1383 | } |
1384 | } |
1385 | |
1386 | /* Now that vars are all in place, clone nested closures. */ |
1387 | |
1388 | for (ix = fpad; ix > 0; ix--) { |
1389 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
1390 | if (namesv |
1391 | && namesv != &PL_sv_undef |
1392 | && !(SvFLAGS(namesv) & SVf_FAKE) |
1393 | && *SvPVX(namesv) == '&' |
1394 | && CvCLONE(ppad[ix])) |
1395 | { |
1396 | CV *kid = cv_clone2((CV*)ppad[ix], cv); |
1397 | SvREFCNT_dec(ppad[ix]); |
1398 | CvCLONE_on(kid); |
1399 | SvPADMY_on(kid); |
1400 | PL_curpad[ix] = (SV*)kid; |
1401 | } |
1402 | } |
1403 | |
1404 | DEBUG_Xv( |
1405 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); |
1406 | cv_dump(outside, "Outside"); |
1407 | cv_dump(proto, "Proto"); |
1408 | cv_dump(cv, "To"); |
1409 | ); |
1410 | |
1411 | LEAVE; |
1412 | |
1413 | if (CvCONST(cv)) { |
1414 | SV* const_sv = op_const_sv(CvSTART(cv), cv); |
1415 | assert(const_sv); |
1416 | /* constant sub () { $x } closing over $x - see lib/constant.pm */ |
1417 | SvREFCNT_dec(cv); |
1418 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); |
1419 | } |
1420 | |
1421 | return cv; |
1422 | } |
1423 | |
1424 | |
1425 | /* |
1426 | =for apidoc pad_fixup_inner_anons |
1427 | |
1428 | For any anon CVs in the pad, change CvOUTSIDE of that CV from |
1429 | old_cv to new_cv if necessary. |
1430 | |
1431 | =cut |
1432 | */ |
1433 | |
1434 | void |
1435 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) |
1436 | { |
1437 | I32 ix; |
1438 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
1439 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
1440 | SV **namepad = AvARRAY(comppad_name); |
1441 | SV **curpad = AvARRAY(comppad); |
1442 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
1443 | SV *namesv = namepad[ix]; |
1444 | if (namesv && namesv != &PL_sv_undef |
1445 | && *SvPVX(namesv) == '&') |
1446 | { |
1447 | CV *innercv = (CV*)curpad[ix]; |
1448 | if (CvOUTSIDE(innercv) == old_cv) { |
1449 | CvOUTSIDE(innercv) = new_cv; |
1450 | if (!CvANON(innercv) || CvCLONED(innercv)) { |
1451 | (void)SvREFCNT_inc(new_cv); |
1452 | SvREFCNT_dec(old_cv); |
1453 | } |
1454 | } |
1455 | } |
1456 | } |
1457 | } |
1458 | |
1459 | /* |
1460 | =for apidoc pad_push |
1461 | |
1462 | Push a new pad frame onto the padlist, unless there's already a pad at |
1463 | this depth, in which case don't bother creating a new one. |
1464 | If has_args is true, give the new pad an @_ in slot zero. |
1465 | |
1466 | =cut |
1467 | */ |
1468 | |
1469 | void |
1470 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) |
1471 | { |
1472 | if (depth <= AvFILLp(padlist)) |
1473 | return; |
1474 | |
1475 | { |
1476 | SV** svp = AvARRAY(padlist); |
1477 | AV *newpad = newAV(); |
1478 | SV **oldpad = AvARRAY(svp[depth-1]); |
1479 | I32 ix = AvFILLp((AV*)svp[1]); |
1480 | I32 names_fill = AvFILLp((AV*)svp[0]); |
1481 | SV** names = AvARRAY(svp[0]); |
1482 | SV* sv; |
1483 | for ( ;ix > 0; ix--) { |
1484 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
1485 | char *name = SvPVX(names[ix]); |
1486 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || *name == '&') { |
1487 | /* outer lexical or anon code */ |
1488 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
1489 | } |
1490 | else { /* our own lexical */ |
1491 | if (*name == '@') |
1492 | av_store(newpad, ix, sv = (SV*)newAV()); |
1493 | else if (*name == '%') |
1494 | av_store(newpad, ix, sv = (SV*)newHV()); |
1495 | else |
1496 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1497 | SvPADMY_on(sv); |
1498 | } |
1499 | } |
1500 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
1501 | av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix])); |
1502 | } |
1503 | else { |
1504 | /* save temporaries on recursion? */ |
1505 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1506 | SvPADTMP_on(sv); |
1507 | } |
1508 | } |
1509 | if (has_args) { |
1510 | AV* av = newAV(); |
1511 | av_extend(av, 0); |
1512 | av_store(newpad, 0, (SV*)av); |
1513 | AvFLAGS(av) = AVf_REIFY; |
1514 | } |
1515 | av_store(padlist, depth, (SV*)newpad); |
1516 | AvFILLp(padlist) = depth; |
1517 | } |
1518 | } |