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