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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 DM |
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 { | |
dd2155a4 | 155 | av_store(pad, 0, Nullsv); |
dd2155a4 DM |
156 | } |
157 | ||
158 | AvREAL_off(padlist); | |
159 | av_store(padlist, 0, (SV*)padname); | |
160 | av_store(padlist, 1, (SV*)pad); | |
161 | ||
162 | /* ... then update state variables */ | |
163 | ||
164 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); | |
165 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); | |
166 | PL_curpad = AvARRAY(PL_comppad); | |
167 | ||
168 | if (! (flags & padnew_CLONE)) { | |
169 | PL_comppad_name_fill = 0; | |
170 | PL_min_intro_pending = 0; | |
171 | PL_padix = 0; | |
172 | } | |
173 | ||
174 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
175 | "Pad 0x%"UVxf"[0x%"UVxf"] new: padlist=0x%"UVxf | |
176 | " name=0x%"UVxf" flags=0x%"UVxf"\n", | |
177 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(padlist), | |
178 | PTR2UV(padname), (UV)flags | |
179 | ) | |
180 | ); | |
181 | ||
182 | return (PADLIST*)padlist; | |
183 | } | |
184 | ||
185 | /* | |
186 | =for apidoc pad_undef | |
187 | ||
188 | Free the padlist associated with a CV. | |
189 | If parts of it happen to be current, we null the relevant | |
190 | PL_*pad* global vars so that we don't have any dangling references left. | |
191 | We also repoint the CvOUTSIDE of any about-to-be-orphaned | |
192 | inner subs to outercv. | |
193 | ||
194 | =cut | |
195 | */ | |
196 | ||
197 | void | |
198 | Perl_pad_undef(pTHX_ CV* cv, CV* outercv) | |
199 | { | |
200 | I32 ix; | |
201 | PADLIST *padlist = CvPADLIST(cv); | |
202 | ||
203 | if (!padlist) | |
204 | return; | |
205 | if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */ | |
206 | return; | |
207 | ||
208 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
209 | "Pad undef: padlist=0x%"UVxf"\n" , PTR2UV(padlist)) | |
210 | ); | |
211 | ||
212 | /* pads may be cleared out already during global destruction */ | |
213 | if ((CvEVAL(cv) && !CvGV(cv) /* is this eval"" ? */ | |
214 | && !PL_dirty) || CvSPECIAL(cv)) | |
215 | { | |
216 | /* XXX DAPM the following code is very similar to | |
217 | * pad_fixup_inner_anons(). Merge??? */ | |
218 | ||
219 | /* inner references to eval's cv must be fixed up */ | |
220 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; | |
221 | SV **namepad = AvARRAY(comppad_name); | |
222 | AV *comppad = (AV*)AvARRAY(padlist)[1]; | |
223 | SV **curpad = AvARRAY(comppad); | |
224 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { | |
225 | SV *namesv = namepad[ix]; | |
226 | if (namesv && namesv != &PL_sv_undef | |
227 | && *SvPVX(namesv) == '&' | |
228 | && ix <= AvFILLp(comppad)) | |
229 | { | |
230 | CV *innercv = (CV*)curpad[ix]; | |
231 | if (innercv && SvTYPE(innercv) == SVt_PVCV | |
232 | && CvOUTSIDE(innercv) == cv) | |
233 | { | |
234 | CvOUTSIDE(innercv) = outercv; | |
235 | if (!CvANON(innercv) || CvCLONED(innercv)) { | |
236 | (void)SvREFCNT_inc(outercv); | |
237 | if (SvREFCNT(cv)) | |
238 | SvREFCNT_dec(cv); | |
239 | } | |
240 | } | |
241 | } | |
242 | } | |
243 | } | |
244 | ix = AvFILLp(padlist); | |
245 | while (ix >= 0) { | |
246 | SV* sv = AvARRAY(padlist)[ix--]; | |
247 | if (!sv) | |
248 | continue; | |
249 | if (sv == (SV*)PL_comppad_name) | |
250 | PL_comppad_name = Nullav; | |
251 | else if (sv == (SV*)PL_comppad) { | |
252 | PL_comppad = Nullav; | |
253 | PL_curpad = Null(SV**); | |
254 | } | |
255 | SvREFCNT_dec(sv); | |
256 | } | |
257 | SvREFCNT_dec((SV*)CvPADLIST(cv)); | |
258 | CvPADLIST(cv) = Null(PADLIST*); | |
259 | } | |
260 | ||
261 | ||
262 | ||
263 | ||
264 | /* | |
265 | =for apidoc pad_add_name | |
266 | ||
267 | Create a new name in the current pad at the specified offset. | |
268 | If C<typestash> is valid, the name is for a typed lexical; set the | |
269 | name's stash to that value. | |
270 | If C<ourstash> is valid, it's an our lexical, set the name's | |
271 | GvSTASH to that value | |
272 | ||
273 | Also, if the name is @.. or %.., create a new array or hash for that slot | |
274 | ||
275 | If fake, it means we're cloning an existing entry | |
276 | ||
277 | =cut | |
278 | */ | |
279 | ||
280 | /* | |
281 | * XXX DAPM this doesn't seem the right place to create a new array/hash. | |
282 | * Whatever we do, we should be consistent - create scalars too, and | |
283 | * create even if fake. Really need to integrate better the whole entry | |
284 | * creation business - when + where does the name and value get created? | |
285 | */ | |
286 | ||
287 | PADOFFSET | |
288 | Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) | |
289 | { | |
290 | PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); | |
291 | SV* namesv = NEWSV(1102, 0); | |
292 | U32 min, max; | |
293 | ||
294 | if (fake) { | |
295 | min = PL_curcop->cop_seq; | |
296 | max = PAD_MAX; | |
297 | } | |
298 | else { | |
299 | /* not yet introduced */ | |
300 | min = PAD_MAX; | |
301 | max = 0; | |
302 | } | |
303 | ||
304 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
305 | "Pad addname: %ld \"%s\", (%lu,%lu)%s\n", | |
306 | (long)offset, name, (unsigned long)min, (unsigned long)max, | |
307 | (fake ? " FAKE" : "") | |
308 | ) | |
309 | ); | |
310 | ||
311 | sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); | |
312 | sv_setpv(namesv, name); | |
313 | ||
314 | if (typestash) { | |
315 | SvFLAGS(namesv) |= SVpad_TYPED; | |
316 | SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) typestash); | |
317 | } | |
318 | if (ourstash) { | |
319 | SvFLAGS(namesv) |= SVpad_OUR; | |
320 | GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash); | |
321 | } | |
322 | ||
323 | av_store(PL_comppad_name, offset, namesv); | |
324 | SvNVX(namesv) = (NV)min; | |
325 | SvIVX(namesv) = max; | |
326 | if (fake) | |
327 | SvFAKE_on(namesv); | |
328 | else { | |
329 | if (!PL_min_intro_pending) | |
330 | PL_min_intro_pending = offset; | |
331 | PL_max_intro_pending = offset; | |
332 | if (*name == '@') | |
333 | av_store(PL_comppad, offset, (SV*)newAV()); | |
334 | else if (*name == '%') | |
335 | av_store(PL_comppad, offset, (SV*)newHV()); | |
336 | SvPADMY_on(PL_curpad[offset]); | |
337 | } | |
338 | ||
339 | return offset; | |
340 | } | |
341 | ||
342 | ||
343 | ||
344 | ||
345 | /* | |
346 | =for apidoc pad_alloc | |
347 | ||
348 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto | |
349 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards | |
350 | for a slot which has no name and and no active value. | |
351 | ||
352 | =cut | |
353 | */ | |
354 | ||
355 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), | |
356 | * or at least rationalise ??? */ | |
357 | ||
358 | ||
359 | PADOFFSET | |
360 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) | |
361 | { | |
362 | SV *sv; | |
363 | I32 retval; | |
364 | ||
365 | if (AvARRAY(PL_comppad) != PL_curpad) | |
366 | Perl_croak(aTHX_ "panic: pad_alloc"); | |
367 | if (PL_pad_reset_pending) | |
368 | pad_reset(); | |
369 | if (tmptype & SVs_PADMY) { | |
370 | do { | |
371 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); | |
372 | } while (SvPADBUSY(sv)); /* need a fresh one */ | |
373 | retval = AvFILLp(PL_comppad); | |
374 | } | |
375 | else { | |
376 | SV **names = AvARRAY(PL_comppad_name); | |
377 | SSize_t names_fill = AvFILLp(PL_comppad_name); | |
378 | for (;;) { | |
379 | /* | |
380 | * "foreach" index vars temporarily become aliases to non-"my" | |
381 | * values. Thus we must skip, not just pad values that are | |
382 | * marked as current pad values, but also those with names. | |
383 | */ | |
384 | /* HVDS why copy to sv here? we don't seem to use it */ | |
385 | if (++PL_padix <= names_fill && | |
386 | (sv = names[PL_padix]) && sv != &PL_sv_undef) | |
387 | continue; | |
388 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); | |
389 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && | |
390 | !IS_PADGV(sv) && !IS_PADCONST(sv)) | |
391 | break; | |
392 | } | |
393 | retval = PL_padix; | |
394 | } | |
395 | SvFLAGS(sv) |= tmptype; | |
396 | PL_curpad = AvARRAY(PL_comppad); | |
397 | ||
398 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
399 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", | |
400 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, | |
401 | PL_op_name[optype])); | |
402 | return (PADOFFSET)retval; | |
403 | } | |
404 | ||
405 | /* | |
406 | =for apidoc pad_add_anon | |
407 | ||
408 | Add an anon code entry to the current compiling pad | |
409 | ||
410 | =cut | |
411 | */ | |
412 | ||
413 | PADOFFSET | |
414 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) | |
415 | { | |
416 | PADOFFSET ix; | |
417 | SV* name; | |
418 | ||
419 | name = NEWSV(1106, 0); | |
420 | sv_upgrade(name, SVt_PVNV); | |
421 | sv_setpvn(name, "&", 1); | |
422 | SvIVX(name) = -1; | |
423 | SvNVX(name) = 1; | |
424 | ix = pad_alloc(op_type, SVs_PADMY); | |
425 | av_store(PL_comppad_name, ix, name); | |
426 | av_store(PL_comppad, ix, sv); | |
427 | SvPADMY_on(sv); | |
428 | return ix; | |
429 | } | |
430 | ||
431 | ||
432 | ||
433 | /* | |
434 | =for apidoc pad_check_dup | |
435 | ||
436 | Check for duplicate declarations: report any of: | |
437 | * a my in the current scope with the same name; | |
438 | * an our (anywhere in the pad) with the same name and the same stash | |
439 | as C<ourstash> | |
440 | C<is_our> indicates that the name to check is an 'our' declaration | |
441 | ||
442 | =cut | |
443 | */ | |
444 | ||
445 | /* XXX DAPM integrate this into pad_add_name ??? */ | |
446 | ||
447 | void | |
448 | Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) | |
449 | { | |
450 | SV **svp, *sv; | |
451 | PADOFFSET top, off; | |
452 | ||
453 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) | |
454 | return; /* nothing to check */ | |
455 | ||
456 | svp = AvARRAY(PL_comppad_name); | |
457 | top = AvFILLp(PL_comppad_name); | |
458 | /* check the current scope */ | |
459 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same | |
460 | * type ? */ | |
461 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { | |
462 | if ((sv = svp[off]) | |
463 | && sv != &PL_sv_undef | |
464 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) | |
465 | && (!is_our | |
466 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) | |
467 | && strEQ(name, SvPVX(sv))) | |
468 | { | |
469 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
470 | "\"%s\" variable %s masks earlier declaration in same %s", | |
471 | (is_our ? "our" : "my"), | |
472 | name, | |
473 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); | |
474 | --off; | |
475 | break; | |
476 | } | |
477 | } | |
478 | /* check the rest of the pad */ | |
479 | if (is_our) { | |
480 | do { | |
481 | if ((sv = svp[off]) | |
482 | && sv != &PL_sv_undef | |
483 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) | |
484 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) | |
485 | && strEQ(name, SvPVX(sv))) | |
486 | { | |
487 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
488 | "\"our\" variable %s redeclared", name); | |
489 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
490 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
491 | break; | |
492 | } | |
493 | } while ( off-- > 0 ); | |
494 | } | |
495 | } | |
496 | ||
497 | ||
498 | ||
499 | /* | |
500 | =for apidoc pad_findmy | |
501 | ||
502 | Given a lexical name, try to find its offset, first in the current pad, | |
503 | or failing that, in the pads of any lexically enclosing subs (including | |
504 | the complications introduced by eval). If the name is found in an outer pad, | |
505 | then a fake entry is added to the current pad. | |
506 | Returns the offset in the current pad, or NOT_IN_PAD on failure. | |
507 | ||
508 | =cut | |
509 | */ | |
510 | ||
511 | PADOFFSET | |
512 | Perl_pad_findmy(pTHX_ char *name) | |
513 | { | |
514 | I32 off; | |
515 | I32 pendoff = 0; | |
516 | SV *sv; | |
517 | SV **svp = AvARRAY(PL_comppad_name); | |
518 | U32 seq = PL_cop_seqmax; | |
519 | PERL_CONTEXT *cx; | |
520 | CV *outside; | |
521 | ||
522 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad findmy: \"%s\"\n", name)); | |
523 | ||
dd2155a4 DM |
524 | /* The one we're looking for is probably just before comppad_name_fill. */ |
525 | for (off = AvFILLp(PL_comppad_name); off > 0; off--) { | |
526 | if ((sv = svp[off]) && | |
527 | sv != &PL_sv_undef && | |
528 | (!SvIVX(sv) || | |
529 | (seq <= (U32)SvIVX(sv) && | |
530 | seq > (U32)I_32(SvNVX(sv)))) && | |
531 | strEQ(SvPVX(sv), name)) | |
532 | { | |
533 | if (SvIVX(sv) || SvFLAGS(sv) & SVpad_OUR) | |
534 | return (PADOFFSET)off; | |
535 | pendoff = off; /* this pending def. will override import */ | |
536 | } | |
537 | } | |
538 | ||
539 | outside = CvOUTSIDE(PL_compcv); | |
540 | ||
541 | /* Check if if we're compiling an eval'', and adjust seq to be the | |
542 | * eval's seq number. This depends on eval'' having a non-null | |
543 | * CvOUTSIDE() while it is being compiled. The eval'' itself is | |
544 | * identified by CvEVAL being true and CvGV being null. */ | |
545 | if (outside && CvEVAL(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) { | |
546 | cx = &cxstack[cxstack_ix]; | |
547 | if (CxREALEVAL(cx)) | |
548 | seq = cx->blk_oldcop->cop_seq; | |
549 | } | |
550 | ||
551 | /* See if it's in a nested scope */ | |
552 | off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0, 0); | |
553 | if (!off) /* pad_findlex returns 0 for failure...*/ | |
554 | return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */ | |
555 | ||
556 | /* If there is a pending local definition, this new alias must die */ | |
557 | if (pendoff) | |
558 | SvIVX(AvARRAY(PL_comppad_name)[off]) = seq; | |
559 | return off; | |
560 | } | |
561 | ||
562 | ||
563 | ||
564 | /* | |
565 | =for apidoc pad_findlex | |
566 | ||
567 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
568 | in the inner pads if its found in an outer one. | |
569 | ||
570 | If flags == FINDLEX_NOSEARCH we don't bother searching outer contexts. | |
571 | ||
572 | =cut | |
573 | */ | |
574 | ||
575 | #define FINDLEX_NOSEARCH 1 /* don't search outer contexts */ | |
576 | ||
577 | STATIC PADOFFSET | |
578 | S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, U32 seq, CV* startcv, | |
579 | I32 cx_ix, I32 saweval, U32 flags) | |
580 | { | |
581 | CV *cv; | |
582 | I32 off; | |
583 | SV *sv; | |
584 | register I32 i; | |
585 | register PERL_CONTEXT *cx; | |
586 | ||
587 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
588 | "Pad findlex: \"%s\" off=%ld seq=%lu cv=0x%"UVxf | |
589 | " ix=%ld saweval=%d flags=%lu\n", | |
590 | name, (long)newoff, (unsigned long)seq, PTR2UV(startcv), | |
591 | (long)cx_ix, (int)saweval, (unsigned long)flags | |
592 | ) | |
593 | ); | |
594 | ||
595 | for (cv = startcv; cv; cv = CvOUTSIDE(cv)) { | |
596 | AV *curlist = CvPADLIST(cv); | |
597 | SV **svp = av_fetch(curlist, 0, FALSE); | |
598 | AV *curname; | |
599 | ||
600 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
601 | " searching: cv=0x%"UVxf"\n", PTR2UV(cv)) | |
602 | ); | |
603 | ||
604 | if (!svp || *svp == &PL_sv_undef) | |
605 | continue; | |
606 | curname = (AV*)*svp; | |
607 | svp = AvARRAY(curname); | |
608 | for (off = AvFILLp(curname); off > 0; off--) { | |
609 | I32 depth; | |
610 | AV *oldpad; | |
611 | SV *oldsv; | |
612 | ||
613 | if ( ! ( | |
614 | (sv = svp[off]) && | |
615 | sv != &PL_sv_undef && | |
616 | seq <= (U32)SvIVX(sv) && | |
617 | seq > (U32)I_32(SvNVX(sv)) && | |
618 | strEQ(SvPVX(sv), name)) | |
619 | ) | |
620 | continue; | |
621 | ||
622 | depth = CvDEPTH(cv); | |
623 | if (!depth) { | |
624 | if (newoff) { | |
625 | if (SvFAKE(sv)) | |
626 | continue; | |
627 | return 0; /* don't clone from inactive stack frame */ | |
628 | } | |
629 | depth = 1; | |
630 | } | |
631 | ||
632 | oldpad = (AV*)AvARRAY(curlist)[depth]; | |
633 | oldsv = *av_fetch(oldpad, off, TRUE); | |
634 | ||
635 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
636 | " matched: offset %ld" | |
637 | " %s(%lu,%lu), sv=0x%"UVxf"\n", | |
638 | (long)off, | |
639 | SvFAKE(sv) ? "FAKE " : "", | |
640 | (unsigned long)I_32(SvNVX(sv)), | |
641 | (unsigned long)SvIVX(sv), | |
642 | PTR2UV(oldsv) | |
643 | ) | |
644 | ); | |
645 | ||
646 | if (!newoff) { /* Not a mere clone operation. */ | |
647 | newoff = pad_add_name( | |
648 | SvPVX(sv), | |
649 | (SvFLAGS(sv) & SVpad_TYPED) ? SvSTASH(sv) : Nullhv, | |
650 | (SvFLAGS(sv) & SVpad_OUR) ? GvSTASH(sv) : Nullhv, | |
651 | 1 /* fake */ | |
652 | ); | |
653 | ||
654 | if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) { | |
655 | /* "It's closures all the way down." */ | |
656 | CvCLONE_on(PL_compcv); | |
657 | if (cv == startcv) { | |
658 | if (CvANON(PL_compcv)) | |
659 | oldsv = Nullsv; /* no need to keep ref */ | |
660 | } | |
661 | else { | |
662 | CV *bcv; | |
663 | for (bcv = startcv; | |
664 | bcv && bcv != cv && !CvCLONE(bcv); | |
665 | bcv = CvOUTSIDE(bcv)) | |
666 | { | |
667 | if (CvANON(bcv)) { | |
668 | /* install the missing pad entry in intervening | |
669 | * nested subs and mark them cloneable. */ | |
670 | AV *ocomppad_name = PL_comppad_name; | |
671 | AV *ocomppad = PL_comppad; | |
672 | SV **ocurpad = PL_curpad; | |
673 | AV *padlist = CvPADLIST(bcv); | |
674 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; | |
675 | PL_comppad = (AV*)AvARRAY(padlist)[1]; | |
676 | PL_curpad = AvARRAY(PL_comppad); | |
677 | pad_add_name( | |
678 | SvPVX(sv), | |
679 | (SvFLAGS(sv) & SVpad_TYPED) | |
680 | ? SvSTASH(sv) : Nullhv, | |
681 | (SvFLAGS(sv) & SVpad_OUR) | |
682 | ? GvSTASH(sv) : Nullhv, | |
683 | 1 /* fake */ | |
684 | ); | |
685 | ||
686 | PL_comppad_name = ocomppad_name; | |
687 | PL_comppad = ocomppad; | |
688 | PL_curpad = ocurpad; | |
689 | CvCLONE_on(bcv); | |
690 | } | |
691 | else { | |
692 | if (ckWARN(WARN_CLOSURE) | |
693 | && !CvUNIQUE(bcv) && !CvUNIQUE(cv)) | |
694 | { | |
695 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
696 | "Variable \"%s\" may be unavailable", | |
697 | name); | |
698 | } | |
699 | break; | |
700 | } | |
701 | } | |
702 | } | |
703 | } | |
704 | else if (!CvUNIQUE(PL_compcv)) { | |
705 | if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv) | |
706 | && !(SvFLAGS(sv) & SVpad_OUR)) | |
707 | { | |
708 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
709 | "Variable \"%s\" will not stay shared", name); | |
710 | } | |
711 | } | |
712 | } | |
713 | av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv)); | |
714 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
715 | "Pad findlex: set offset %ld to sv 0x%"UVxf"\n", | |
716 | (long)newoff, PTR2UV(oldsv) | |
717 | ) | |
718 | ); | |
719 | return newoff; | |
720 | } | |
721 | } | |
722 | ||
723 | if (flags & FINDLEX_NOSEARCH) | |
724 | return 0; | |
725 | ||
726 | /* Nothing in current lexical context--try eval's context, if any. | |
727 | * This is necessary to let the perldb get at lexically scoped variables. | |
728 | * XXX This will also probably interact badly with eval tree caching. | |
729 | */ | |
730 | ||
731 | for (i = cx_ix; i >= 0; i--) { | |
732 | cx = &cxstack[i]; | |
733 | switch (CxTYPE(cx)) { | |
734 | default: | |
735 | if (i == 0 && saweval) { | |
736 | return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval, 0); | |
737 | } | |
738 | break; | |
739 | case CXt_EVAL: | |
740 | switch (cx->blk_eval.old_op_type) { | |
741 | case OP_ENTEREVAL: | |
742 | if (CxREALEVAL(cx)) { | |
743 | PADOFFSET off; | |
744 | saweval = i; | |
745 | seq = cxstack[i].blk_oldcop->cop_seq; | |
746 | startcv = cxstack[i].blk_eval.cv; | |
747 | if (startcv && CvOUTSIDE(startcv)) { | |
748 | off = pad_findlex(name, newoff, seq, CvOUTSIDE(startcv), | |
749 | i - 1, saweval, 0); | |
750 | if (off) /* continue looking if not found here */ | |
751 | return off; | |
752 | } | |
753 | } | |
754 | break; | |
755 | case OP_DOFILE: | |
756 | case OP_REQUIRE: | |
757 | /* require/do must have their own scope */ | |
758 | return 0; | |
759 | } | |
760 | break; | |
761 | case CXt_FORMAT: | |
762 | case CXt_SUB: | |
763 | if (!saweval) | |
764 | return 0; | |
765 | cv = cx->blk_sub.cv; | |
766 | if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */ | |
767 | saweval = i; /* so we know where we were called from */ | |
768 | seq = cxstack[i].blk_oldcop->cop_seq; | |
769 | continue; | |
770 | } | |
771 | return pad_findlex(name, newoff, seq, cv, i - 1, saweval, FINDLEX_NOSEARCH); | |
772 | } | |
773 | } | |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
778 | ||
779 | /* | |
780 | =for apidoc pad_sv | |
781 | ||
782 | Get the value at offset po in the current pad. | |
783 | Use macro PAD_SV instead of calling this function directly. | |
784 | ||
785 | =cut | |
786 | */ | |
787 | ||
788 | ||
789 | SV * | |
790 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
791 | { | |
792 | #ifdef DEBUGGING | |
793 | /* for display purposes, try to guess the AV corresponding to | |
794 | * Pl_curpad */ | |
795 | AV *cp = PL_comppad; | |
796 | if (cp && AvARRAY(cp) != PL_curpad) | |
797 | cp = Nullav; | |
798 | #endif | |
799 | ||
dd2155a4 DM |
800 | if (!po) |
801 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
802 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
803 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
804 | PTR2UV(cp), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) | |
805 | ); | |
806 | return PL_curpad[po]; | |
807 | } | |
808 | ||
809 | ||
810 | /* | |
811 | =for apidoc pad_setsv | |
812 | ||
813 | Set the entry at offset po in the current pad to sv. | |
814 | Use the macro PAD_SETSV() rather than calling this function directly. | |
815 | ||
816 | =cut | |
817 | */ | |
818 | ||
819 | #ifdef DEBUGGING | |
820 | void | |
821 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
822 | { | |
823 | /* for display purposes, try to guess the AV corresponding to | |
824 | * Pl_curpad */ | |
825 | AV *cp = PL_comppad; | |
826 | if (cp && AvARRAY(cp) != PL_curpad) | |
827 | cp = Nullav; | |
828 | ||
829 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
830 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
831 | PTR2UV(cp), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) | |
832 | ); | |
833 | PL_curpad[po] = sv; | |
834 | } | |
835 | #endif | |
836 | ||
837 | ||
838 | ||
839 | /* | |
840 | =for apidoc pad_block_start | |
841 | ||
842 | Update the pad compilation state variables on entry to a new block | |
843 | ||
844 | =cut | |
845 | */ | |
846 | ||
847 | /* XXX DAPM perhaps: | |
848 | * - integrate this in general state-saving routine ??? | |
849 | * - combine with the state-saving going on in pad_new ??? | |
850 | * - introduce a new SAVE type that does all this in one go ? | |
851 | */ | |
852 | ||
853 | void | |
854 | Perl_pad_block_start(pTHX_ int full) | |
855 | { | |
856 | SAVEI32(PL_comppad_name_floor); | |
857 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
858 | if (full) | |
859 | PL_comppad_name_fill = PL_comppad_name_floor; | |
860 | if (PL_comppad_name_floor < 0) | |
861 | PL_comppad_name_floor = 0; | |
862 | SAVEI32(PL_min_intro_pending); | |
863 | SAVEI32(PL_max_intro_pending); | |
864 | PL_min_intro_pending = 0; | |
865 | SAVEI32(PL_comppad_name_fill); | |
866 | SAVEI32(PL_padix_floor); | |
867 | PL_padix_floor = PL_padix; | |
868 | PL_pad_reset_pending = FALSE; | |
869 | } | |
870 | ||
871 | ||
872 | /* | |
873 | =for apidoc intro_my | |
874 | ||
875 | "Introduce" my variables to visible status. | |
876 | ||
877 | =cut | |
878 | */ | |
879 | ||
880 | U32 | |
881 | Perl_intro_my(pTHX) | |
882 | { | |
883 | SV **svp; | |
884 | SV *sv; | |
885 | I32 i; | |
886 | ||
887 | if (! PL_min_intro_pending) | |
888 | return PL_cop_seqmax; | |
889 | ||
890 | svp = AvARRAY(PL_comppad_name); | |
891 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
892 | if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) { | |
893 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ | |
894 | SvNVX(sv) = (NV)PL_cop_seqmax; | |
895 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
896 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", | |
897 | (long)i, SvPVX(sv), | |
898 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) | |
899 | ); | |
900 | } | |
901 | } | |
902 | PL_min_intro_pending = 0; | |
903 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
904 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
905 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
906 | ||
907 | return PL_cop_seqmax++; | |
908 | } | |
909 | ||
910 | /* | |
911 | =for apidoc pad_leavemy | |
912 | ||
913 | Cleanup at end of scope during compilation: set the max seq number for | |
914 | lexicals in this scope and warn of any lexicals that never got introduced. | |
915 | ||
916 | =cut | |
917 | */ | |
918 | ||
919 | void | |
920 | Perl_pad_leavemy(pTHX) | |
921 | { | |
922 | I32 off; | |
923 | SV **svp = AvARRAY(PL_comppad_name); | |
924 | SV *sv; | |
925 | ||
926 | PL_pad_reset_pending = FALSE; | |
927 | ||
928 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { | |
929 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
930 | if ((sv = svp[off]) && sv != &PL_sv_undef && ckWARN_d(WARN_INTERNAL)) | |
931 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), | |
932 | "%s never introduced", SvPVX(sv)); | |
933 | } | |
934 | } | |
935 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
936 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
937 | if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX) { | |
938 | SvIVX(sv) = PL_cop_seqmax; | |
939 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
940 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", | |
941 | (long)off, SvPVX(sv), | |
942 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) | |
943 | ); | |
944 | } | |
945 | } | |
946 | PL_cop_seqmax++; | |
947 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
948 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
949 | } | |
950 | ||
951 | ||
952 | /* | |
953 | =for apidoc pad_swipe | |
954 | ||
955 | Abandon the tmp in the current pad at offset po and replace with a | |
956 | new one. | |
957 | ||
958 | =cut | |
959 | */ | |
960 | ||
961 | void | |
962 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
963 | { | |
964 | if (!PL_curpad) | |
965 | return; | |
966 | if (AvARRAY(PL_comppad) != PL_curpad) | |
967 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
968 | if (!po) | |
969 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
970 | ||
971 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
972 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
973 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
974 | ||
975 | if (PL_curpad[po]) | |
976 | SvPADTMP_off(PL_curpad[po]); | |
977 | if (refadjust) | |
978 | SvREFCNT_dec(PL_curpad[po]); | |
979 | ||
980 | PL_curpad[po] = NEWSV(1107,0); | |
981 | SvPADTMP_on(PL_curpad[po]); | |
982 | if ((I32)po < PL_padix) | |
983 | PL_padix = po - 1; | |
984 | } | |
985 | ||
986 | ||
987 | /* | |
988 | =for apidoc pad_reset | |
989 | ||
990 | Mark all the current temporaries for reuse | |
991 | ||
992 | =cut | |
993 | */ | |
994 | ||
995 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
996 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
997 | * on the stack by OPs that use them, there are several ways to get an alias | |
998 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
999 | * We avoid doing this until we can think of a Better Way. | |
1000 | * GSAR 97-10-29 */ | |
1001 | void | |
1002 | Perl_pad_reset(pTHX) | |
1003 | { | |
1004 | #ifdef USE_BROKEN_PAD_RESET | |
1005 | register I32 po; | |
1006 | ||
1007 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1008 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
1009 | ||
1010 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1011 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
1012 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1013 | (long)PL_padix, (long)PL_padix_floor | |
1014 | ) | |
1015 | ); | |
1016 | ||
1017 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
1018 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { | |
1019 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1020 | SvPADTMP_off(PL_curpad[po]); | |
1021 | } | |
1022 | PL_padix = PL_padix_floor; | |
1023 | } | |
1024 | #endif | |
1025 | PL_pad_reset_pending = FALSE; | |
1026 | } | |
1027 | ||
1028 | ||
1029 | /* | |
1030 | =for apidoc pad_tidy | |
1031 | ||
1032 | Tidy up a pad after we've finished compiling it: | |
1033 | * remove most stuff from the pads of anonsub prototypes; | |
1034 | * give it a @_; | |
1035 | * mark tmps as such. | |
1036 | ||
1037 | =cut | |
1038 | */ | |
1039 | ||
1040 | /* XXX DAPM surely most of this stuff should be done properly | |
1041 | * at the right time beforehand, rather than going around afterwards | |
1042 | * cleaning up our mistakes ??? | |
1043 | */ | |
1044 | ||
1045 | void | |
1046 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1047 | { | |
1048 | PADOFFSET ix; | |
1049 | ||
1050 | /* extend curpad to match namepad */ | |
1051 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
1052 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); | |
1053 | ||
1054 | if (type == padtidy_SUBCLONE) { | |
1055 | SV **namep = AvARRAY(PL_comppad_name); | |
1056 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1057 | SV *namesv; | |
1058 | ||
1059 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1060 | continue; | |
1061 | /* | |
1062 | * The only things that a clonable function needs in its | |
1063 | * pad are references to outer lexicals and anonymous subs. | |
1064 | * The rest are created anew during cloning. | |
1065 | */ | |
1066 | if (!((namesv = namep[ix]) != Nullsv && | |
1067 | namesv != &PL_sv_undef && | |
1068 | (SvFAKE(namesv) || | |
1069 | *SvPVX(namesv) == '&'))) | |
1070 | { | |
1071 | SvREFCNT_dec(PL_curpad[ix]); | |
1072 | PL_curpad[ix] = Nullsv; | |
1073 | } | |
1074 | } | |
1075 | } | |
1076 | else if (type == padtidy_SUB) { | |
1077 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
1078 | AV *av = newAV(); /* Will be @_ */ | |
1079 | av_extend(av, 0); | |
1080 | av_store(PL_comppad, 0, (SV*)av); | |
1081 | AvFLAGS(av) = AVf_REIFY; | |
1082 | } | |
1083 | ||
1084 | /* XXX DAPM rationalise these two similar branches */ | |
1085 | ||
1086 | if (type == padtidy_SUB) { | |
1087 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1088 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1089 | continue; | |
1090 | if (!SvPADMY(PL_curpad[ix])) | |
1091 | SvPADTMP_on(PL_curpad[ix]); | |
1092 | } | |
1093 | } | |
1094 | else if (type == padtidy_FORMAT) { | |
1095 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1096 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) | |
1097 | SvPADTMP_on(PL_curpad[ix]); | |
1098 | } | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | ||
1103 | /* | |
1104 | =for apidoc pad_free | |
1105 | ||
1106 | Free the SV at offet po in the current pad. | |
1107 | ||
1108 | =cut | |
1109 | */ | |
1110 | ||
1111 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1112 | void | |
1113 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1114 | { | |
1115 | if (!PL_curpad) | |
1116 | return; | |
1117 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1118 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1119 | if (!po) | |
1120 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1121 | ||
1122 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1123 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1124 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1125 | ); | |
1126 | ||
1127 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1128 | SvPADTMP_off(PL_curpad[po]); | |
1129 | #ifdef USE_ITHREADS | |
1130 | #ifdef PERL_COPY_ON_WRITE | |
1131 | if (SvIsCOW(PL_curpad[po])) { | |
1132 | sv_force_normal_flags(PL_curpad[po], SV_COW_DROP_PV); | |
1133 | } else | |
1134 | #endif | |
1135 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ | |
1136 | ||
1137 | #endif | |
1138 | } | |
1139 | if ((I32)po < PL_padix) | |
1140 | PL_padix = po - 1; | |
1141 | } | |
1142 | ||
1143 | ||
1144 | ||
1145 | /* | |
1146 | =for apidoc do_dump_pad | |
1147 | ||
1148 | Dump the contents of a padlist | |
1149 | ||
1150 | =cut | |
1151 | */ | |
1152 | ||
1153 | void | |
1154 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1155 | { | |
1156 | AV *pad_name; | |
1157 | AV *pad; | |
1158 | SV **pname; | |
1159 | SV **ppad; | |
1160 | SV *namesv; | |
1161 | I32 ix; | |
1162 | ||
1163 | if (!padlist) { | |
1164 | return; | |
1165 | } | |
1166 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); | |
1167 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); | |
1168 | pname = AvARRAY(pad_name); | |
1169 | ppad = AvARRAY(pad); | |
1170 | Perl_dump_indent(aTHX_ level, file, | |
1171 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1172 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1173 | ); | |
1174 | ||
1175 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
1176 | namesv = pname[ix]; | |
1177 | if (namesv && namesv == &PL_sv_undef) { | |
1178 | namesv = Nullsv; | |
1179 | } | |
1180 | if (namesv) { | |
1181 | Perl_dump_indent(aTHX_ level+1, file, | |
1182 | "%2d. 0x%"UVxf"<%lu> %s (%lu,%lu) \"%s\"\n", | |
1183 | (int) ix, | |
1184 | PTR2UV(ppad[ix]), | |
1185 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
1186 | SvFAKE(namesv) ? "FAKE" : " ", | |
1187 | (unsigned long)I_32(SvNVX(namesv)), | |
1188 | (unsigned long)SvIVX(namesv), | |
1189 | SvPVX(namesv) | |
1190 | ); | |
1191 | } | |
1192 | else if (full) { | |
1193 | Perl_dump_indent(aTHX_ level+1, file, | |
1194 | "%2d. 0x%"UVxf"<%lu>\n", | |
1195 | (int) ix, | |
1196 | PTR2UV(ppad[ix]), | |
1197 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1198 | ); | |
1199 | } | |
1200 | } | |
1201 | } | |
1202 | ||
1203 | ||
1204 | ||
1205 | /* | |
1206 | =for apidoc cv_dump | |
1207 | ||
1208 | dump the contents of a CV | |
1209 | ||
1210 | =cut | |
1211 | */ | |
1212 | ||
1213 | #ifdef DEBUGGING | |
1214 | STATIC void | |
1215 | S_cv_dump(pTHX_ CV *cv, char *title) | |
1216 | { | |
1217 | CV *outside = CvOUTSIDE(cv); | |
1218 | AV* padlist = CvPADLIST(cv); | |
1219 | ||
1220 | PerlIO_printf(Perl_debug_log, | |
1221 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1222 | title, | |
1223 | PTR2UV(cv), | |
1224 | (CvANON(cv) ? "ANON" | |
1225 | : (cv == PL_main_cv) ? "MAIN" | |
1226 | : CvUNIQUE(cv) ? "UNIQUE" | |
1227 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1228 | PTR2UV(outside), | |
1229 | (!outside ? "null" | |
1230 | : CvANON(outside) ? "ANON" | |
1231 | : (outside == PL_main_cv) ? "MAIN" | |
1232 | : CvUNIQUE(outside) ? "UNIQUE" | |
1233 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1234 | ||
1235 | PerlIO_printf(Perl_debug_log, | |
1236 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1237 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1238 | } | |
1239 | #endif /* DEBUGGING */ | |
1240 | ||
1241 | ||
1242 | ||
1243 | ||
1244 | ||
1245 | /* | |
1246 | =for apidoc cv_clone | |
1247 | ||
1248 | Clone a CV: make a new CV which points to the same code etc, but which | |
1249 | has a newly-created pad built by copying the prototype pad and capturing | |
1250 | any outer lexicals. | |
1251 | ||
1252 | =cut | |
1253 | */ | |
1254 | ||
1255 | CV * | |
1256 | Perl_cv_clone(pTHX_ CV *proto) | |
1257 | { | |
1258 | CV *cv; | |
1259 | ||
1260 | LOCK_CRED_MUTEX; /* XXX create separate mutex */ | |
1261 | cv = cv_clone2(proto, CvOUTSIDE(proto)); | |
1262 | UNLOCK_CRED_MUTEX; /* XXX create separate mutex */ | |
1263 | return cv; | |
1264 | } | |
1265 | ||
1266 | ||
1267 | /* XXX DAPM separate out cv and paddish bits ??? | |
1268 | * ideally the CV-related stuff shouldn't be in pad.c - how about | |
1269 | * a cv.c? */ | |
1270 | ||
1271 | STATIC CV * | |
1272 | S_cv_clone2(pTHX_ CV *proto, CV *outside) | |
1273 | { | |
1274 | I32 ix; | |
1275 | AV* protopadlist = CvPADLIST(proto); | |
1276 | AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); | |
1277 | AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); | |
1278 | SV** pname = AvARRAY(protopad_name); | |
1279 | SV** ppad = AvARRAY(protopad); | |
1280 | I32 fname = AvFILLp(protopad_name); | |
1281 | I32 fpad = AvFILLp(protopad); | |
1282 | AV* comppadlist; | |
1283 | CV* cv; | |
1284 | ||
1285 | assert(!CvUNIQUE(proto)); | |
1286 | ||
1287 | ENTER; | |
1288 | SAVESPTR(PL_compcv); | |
1289 | ||
1290 | cv = PL_compcv = (CV*)NEWSV(1104, 0); | |
1291 | sv_upgrade((SV *)cv, SvTYPE(proto)); | |
1292 | CvFLAGS(cv) = CvFLAGS(proto) & ~CVf_CLONE; | |
1293 | CvCLONED_on(cv); | |
1294 | ||
dd2155a4 DM |
1295 | #ifdef USE_ITHREADS |
1296 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) | |
1297 | : savepv(CvFILE(proto)); | |
1298 | #else | |
1299 | CvFILE(cv) = CvFILE(proto); | |
1300 | #endif | |
1301 | CvGV(cv) = CvGV(proto); | |
1302 | CvSTASH(cv) = CvSTASH(proto); | |
1303 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); | |
1304 | CvSTART(cv) = CvSTART(proto); | |
1305 | if (outside) | |
1306 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); | |
1307 | ||
1308 | if (SvPOK(proto)) | |
1309 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); | |
1310 | ||
1311 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); | |
1312 | ||
1313 | for (ix = fname; ix >= 0; ix--) | |
1314 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1315 | ||
1316 | av_fill(PL_comppad, fpad); | |
1317 | PL_curpad = AvARRAY(PL_comppad); | |
1318 | ||
1319 | for (ix = fpad; ix > 0; ix--) { | |
1320 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; | |
1321 | if (namesv && namesv != &PL_sv_undef) { | |
1322 | char *name = SvPVX(namesv); /* XXX */ | |
1323 | if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */ | |
1324 | I32 off = pad_findlex(name, ix, SvIVX(namesv), | |
1325 | CvOUTSIDE(cv), cxstack_ix, 0, 0); | |
1326 | if (!off) | |
1327 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); | |
1328 | else if (off != ix) | |
1329 | Perl_croak(aTHX_ "panic: cv_clone: %s", name); | |
1330 | } | |
1331 | else { /* our own lexical */ | |
1332 | SV* sv; | |
1333 | if (*name == '&') { | |
1334 | /* anon code -- we'll come back for it */ | |
1335 | sv = SvREFCNT_inc(ppad[ix]); | |
1336 | } | |
1337 | else if (*name == '@') | |
1338 | sv = (SV*)newAV(); | |
1339 | else if (*name == '%') | |
1340 | sv = (SV*)newHV(); | |
1341 | else | |
1342 | sv = NEWSV(0, 0); | |
1343 | if (!SvPADBUSY(sv)) | |
1344 | SvPADMY_on(sv); | |
1345 | PL_curpad[ix] = sv; | |
1346 | } | |
1347 | } | |
1348 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
1349 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); | |
1350 | } | |
1351 | else { | |
1352 | SV* sv = NEWSV(0, 0); | |
1353 | SvPADTMP_on(sv); | |
1354 | PL_curpad[ix] = sv; | |
1355 | } | |
1356 | } | |
1357 | ||
1358 | /* Now that vars are all in place, clone nested closures. */ | |
1359 | ||
1360 | for (ix = fpad; ix > 0; ix--) { | |
1361 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; | |
1362 | if (namesv | |
1363 | && namesv != &PL_sv_undef | |
1364 | && !(SvFLAGS(namesv) & SVf_FAKE) | |
1365 | && *SvPVX(namesv) == '&' | |
1366 | && CvCLONE(ppad[ix])) | |
1367 | { | |
1368 | CV *kid = cv_clone2((CV*)ppad[ix], cv); | |
1369 | SvREFCNT_dec(ppad[ix]); | |
1370 | CvCLONE_on(kid); | |
1371 | SvPADMY_on(kid); | |
1372 | PL_curpad[ix] = (SV*)kid; | |
1373 | } | |
1374 | } | |
1375 | ||
1376 | DEBUG_Xv( | |
1377 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1378 | cv_dump(outside, "Outside"); | |
1379 | cv_dump(proto, "Proto"); | |
1380 | cv_dump(cv, "To"); | |
1381 | ); | |
1382 | ||
1383 | LEAVE; | |
1384 | ||
1385 | if (CvCONST(cv)) { | |
1386 | SV* const_sv = op_const_sv(CvSTART(cv), cv); | |
1387 | assert(const_sv); | |
1388 | /* constant sub () { $x } closing over $x - see lib/constant.pm */ | |
1389 | SvREFCNT_dec(cv); | |
1390 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); | |
1391 | } | |
1392 | ||
1393 | return cv; | |
1394 | } | |
1395 | ||
1396 | ||
1397 | /* | |
1398 | =for apidoc pad_fixup_inner_anons | |
1399 | ||
1400 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
1401 | old_cv to new_cv if necessary. | |
1402 | ||
1403 | =cut | |
1404 | */ | |
1405 | ||
1406 | void | |
1407 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1408 | { | |
1409 | I32 ix; | |
1410 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; | |
1411 | AV *comppad = (AV*)AvARRAY(padlist)[1]; | |
1412 | SV **namepad = AvARRAY(comppad_name); | |
1413 | SV **curpad = AvARRAY(comppad); | |
1414 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { | |
1415 | SV *namesv = namepad[ix]; | |
1416 | if (namesv && namesv != &PL_sv_undef | |
1417 | && *SvPVX(namesv) == '&') | |
1418 | { | |
1419 | CV *innercv = (CV*)curpad[ix]; | |
1420 | if (CvOUTSIDE(innercv) == old_cv) { | |
1421 | CvOUTSIDE(innercv) = new_cv; | |
1422 | if (!CvANON(innercv) || CvCLONED(innercv)) { | |
1423 | (void)SvREFCNT_inc(new_cv); | |
1424 | SvREFCNT_dec(old_cv); | |
1425 | } | |
1426 | } | |
1427 | } | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | /* | |
1432 | =for apidoc pad_push | |
1433 | ||
1434 | Push a new pad frame onto the padlist, unless there's already a pad at | |
1435 | this depth, in which case don't bother creating a new one. | |
1436 | If has_args is true, give the new pad an @_ in slot zero. | |
1437 | ||
1438 | =cut | |
1439 | */ | |
1440 | ||
1441 | void | |
1442 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) | |
1443 | { | |
1444 | if (depth <= AvFILLp(padlist)) | |
1445 | return; | |
1446 | ||
1447 | { | |
1448 | SV** svp = AvARRAY(padlist); | |
1449 | AV *newpad = newAV(); | |
1450 | SV **oldpad = AvARRAY(svp[depth-1]); | |
1451 | I32 ix = AvFILLp((AV*)svp[1]); | |
1452 | I32 names_fill = AvFILLp((AV*)svp[0]); | |
1453 | SV** names = AvARRAY(svp[0]); | |
1454 | SV* sv; | |
1455 | for ( ;ix > 0; ix--) { | |
1456 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
1457 | char *name = SvPVX(names[ix]); | |
1458 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || *name == '&') { | |
1459 | /* outer lexical or anon code */ | |
1460 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1461 | } | |
1462 | else { /* our own lexical */ | |
1463 | if (*name == '@') | |
1464 | av_store(newpad, ix, sv = (SV*)newAV()); | |
1465 | else if (*name == '%') | |
1466 | av_store(newpad, ix, sv = (SV*)newHV()); | |
1467 | else | |
1468 | av_store(newpad, ix, sv = NEWSV(0, 0)); | |
1469 | SvPADMY_on(sv); | |
1470 | } | |
1471 | } | |
1472 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
1473 | av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix])); | |
1474 | } | |
1475 | else { | |
1476 | /* save temporaries on recursion? */ | |
1477 | av_store(newpad, ix, sv = NEWSV(0, 0)); | |
1478 | SvPADTMP_on(sv); | |
1479 | } | |
1480 | } | |
1481 | if (has_args) { | |
1482 | AV* av = newAV(); | |
1483 | av_extend(av, 0); | |
1484 | av_store(newpad, 0, (SV*)av); | |
1485 | AvFLAGS(av) = AVf_REIFY; | |
1486 | } | |
1487 | av_store(padlist, depth, (SV*)newpad); | |
1488 | AvFILLp(padlist) = depth; | |
1489 | } | |
1490 | } |