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dd2155a4 |
1 | /* pad.c |
2 | * |
3 | * Copyright (c) 2002, Larry Wall |
4 | * |
5 | * You may distribute under the terms of either the GNU General Public |
6 | * License or the Artistic License, as specified in the README file. |
7 | * |
8 | * "Anyway: there was this Mr Frodo left an orphan and stranded, as you |
9 | * might say, among those queer Bucklanders, being brought up anyhow in |
10 | * Brandy Hall. A regular warren, by all accounts. Old Master Gorbadoc |
11 | * never had fewer than a couple of hundred relations in the place. Mr |
12 | * Bilbo never did a kinder deed than when he brought the lad back to |
13 | * live among decent folk." --the Gaffer |
14 | */ |
15 | |
16 | /* XXX DAPM |
17 | * As of Sept 2002, this file is new and may be in a state of flux for |
18 | * a while. I've marked things I intent to come back and look at further |
19 | * with an 'XXX DAPM' comment. |
20 | */ |
21 | |
22 | /* |
23 | =head1 Pad Data Structures |
24 | |
25 | =for apidoc m|AV *|CvPADLIST|CV *cv |
26 | CV's can have CvPADLIST(cv) set to point to an AV. |
27 | |
28 | For these purposes "forms" are a kind-of CV, eval""s are too (except they're |
29 | not callable at will and are always thrown away after the eval"" is done |
30 | executing). |
31 | |
32 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, |
33 | but that is really the callers pad (a slot of which is allocated by |
34 | every entersub). |
35 | |
36 | The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items |
f3548bdc |
37 | is managed "manual" (mostly in pad.c) rather than normal av.c rules. |
dd2155a4 |
38 | The items in the AV are not SVs as for a normal AV, but other AVs: |
39 | |
40 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather |
41 | the "static type information" for lexicals. |
42 | |
43 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that |
44 | depth of recursion into the CV. |
45 | The 0'th slot of a frame AV is an AV which is @_. |
46 | other entries are storage for variables and op targets. |
47 | |
48 | During compilation: |
49 | C<PL_comppad_name> is set the the the names AV. |
50 | C<PL_comppad> is set the the frame AV for the frame CvDEPTH == 1. |
51 | C<PL_curpad> is set the body of the frame AV (i.e. AvARRAY(PL_comppad)). |
52 | |
f3548bdc |
53 | During execution, C<PL_comppad> and C<PL_curpad> refer to the live |
54 | frame of the currently executing sub. |
55 | |
56 | Iterating over the names AV iterates over all possible pad |
dd2155a4 |
57 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
58 | &PL_sv_undef "names" (see pad_alloc()). |
59 | |
60 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. |
61 | The rest are op targets/GVs/constants which are statically allocated |
62 | or resolved at compile time. These don't have names by which they |
63 | can be looked up from Perl code at run time through eval"" like |
64 | my/our variables can be. Since they can't be looked up by "name" |
65 | but only by their index allocated at compile time (which is usually |
66 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. |
67 | |
68 | The SVs in the names AV have their PV being the name of the variable. |
69 | NV+1..IV inclusive is a range of cop_seq numbers for which the name is |
70 | valid. For typed lexicals name SV is SVt_PVMG and SvSTASH points at the |
71 | type. For C<our> lexicals, the type is SVt_PVGV, and GvSTASH points at the |
72 | stash of the associated global (so that duplicate C<our> delarations in the |
73 | same package can be detected). SvCUR is sometimes hijacked to |
74 | store the generation number during compilation. |
75 | |
76 | If SvFAKE is set on the name SV then slot in the frame AVs are |
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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 * |
c7c737cb |
114 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 |
115 | { |
116 | AV *padlist, *padname, *pad, *a0; |
117 | |
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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(); |
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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 | |
7dafbf52 |
201 | (This function should really be called pad_free, but the name was already |
202 | taken) |
203 | |
dd2155a4 |
204 | =cut |
205 | */ |
206 | |
207 | void |
a3985cdc |
208 | Perl_pad_undef(pTHX_ CV* cv) |
dd2155a4 |
209 | { |
210 | I32 ix; |
211 | PADLIST *padlist = CvPADLIST(cv); |
212 | |
213 | if (!padlist) |
214 | return; |
215 | if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */ |
216 | return; |
217 | |
218 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
219 | "Pad undef: padlist=0x%"UVxf"\n" , PTR2UV(padlist)) |
220 | ); |
221 | |
7dafbf52 |
222 | /* detach any '&' anon children in the pad; if afterwards they |
223 | * are still live, fix up their CvOUTSIDEs to point to our outside, |
224 | * bypassing us. */ |
225 | /* XXX DAPM for efficiency, we should only do this if we know we have |
226 | * children, or integrate this loop with general cleanup */ |
dd2155a4 |
227 | |
7dafbf52 |
228 | if (!PL_dirty) { /* don't bother during global destruction */ |
229 | CV *outercv = CvOUTSIDE(cv); |
230 | U32 seq = CvOUTSIDE_SEQ(cv); |
dd2155a4 |
231 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
232 | SV **namepad = AvARRAY(comppad_name); |
233 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
234 | SV **curpad = AvARRAY(comppad); |
235 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
236 | SV *namesv = namepad[ix]; |
237 | if (namesv && namesv != &PL_sv_undef |
7dafbf52 |
238 | && *SvPVX(namesv) == '&') |
dd2155a4 |
239 | { |
240 | CV *innercv = (CV*)curpad[ix]; |
7dafbf52 |
241 | namepad[ix] = Nullsv; |
242 | SvREFCNT_dec(namesv); |
243 | curpad[ix] = Nullsv; |
244 | SvREFCNT_dec(innercv); |
245 | if (SvREFCNT(innercv) /* in use, not just a prototype */ |
dd2155a4 |
246 | && CvOUTSIDE(innercv) == cv) |
247 | { |
7dafbf52 |
248 | assert(CvWEAKOUTSIDE(innercv)); |
249 | CvWEAKOUTSIDE_off(innercv); |
dd2155a4 |
250 | CvOUTSIDE(innercv) = outercv; |
a3985cdc |
251 | CvOUTSIDE_SEQ(innercv) = seq; |
7dafbf52 |
252 | SvREFCNT_inc(outercv); |
dd2155a4 |
253 | } |
254 | } |
255 | } |
256 | } |
7dafbf52 |
257 | |
dd2155a4 |
258 | ix = AvFILLp(padlist); |
259 | while (ix >= 0) { |
260 | SV* sv = AvARRAY(padlist)[ix--]; |
261 | if (!sv) |
262 | continue; |
263 | if (sv == (SV*)PL_comppad_name) |
264 | PL_comppad_name = Nullav; |
265 | else if (sv == (SV*)PL_comppad) { |
f3548bdc |
266 | PL_comppad = Null(PAD*); |
dd2155a4 |
267 | PL_curpad = Null(SV**); |
268 | } |
269 | SvREFCNT_dec(sv); |
270 | } |
271 | SvREFCNT_dec((SV*)CvPADLIST(cv)); |
272 | CvPADLIST(cv) = Null(PADLIST*); |
273 | } |
274 | |
275 | |
276 | |
277 | |
278 | /* |
279 | =for apidoc pad_add_name |
280 | |
281 | Create a new name in the current pad at the specified offset. |
282 | If C<typestash> is valid, the name is for a typed lexical; set the |
283 | name's stash to that value. |
284 | If C<ourstash> is valid, it's an our lexical, set the name's |
285 | GvSTASH to that value |
286 | |
287 | Also, if the name is @.. or %.., create a new array or hash for that slot |
288 | |
289 | If fake, it means we're cloning an existing entry |
290 | |
291 | =cut |
292 | */ |
293 | |
294 | /* |
295 | * XXX DAPM this doesn't seem the right place to create a new array/hash. |
296 | * Whatever we do, we should be consistent - create scalars too, and |
297 | * create even if fake. Really need to integrate better the whole entry |
298 | * creation business - when + where does the name and value get created? |
299 | */ |
300 | |
301 | PADOFFSET |
302 | Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) |
303 | { |
304 | PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
305 | SV* namesv = NEWSV(1102, 0); |
dd2155a4 |
306 | |
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307 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
308 | |
dd2155a4 |
309 | |
310 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
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311 | "Pad addname: %ld \"%s\"%s\n", |
312 | (long)offset, name, (fake ? " FAKE" : "") |
dd2155a4 |
313 | ) |
314 | ); |
315 | |
316 | sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); |
317 | sv_setpv(namesv, name); |
318 | |
319 | if (typestash) { |
320 | SvFLAGS(namesv) |= SVpad_TYPED; |
321 | SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) typestash); |
322 | } |
323 | if (ourstash) { |
324 | SvFLAGS(namesv) |= SVpad_OUR; |
325 | GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash); |
326 | } |
327 | |
328 | av_store(PL_comppad_name, offset, namesv); |
dd2155a4 |
329 | if (fake) |
330 | SvFAKE_on(namesv); |
331 | else { |
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332 | /* not yet introduced */ |
333 | SvNVX(namesv) = (NV)PAD_MAX; /* min */ |
334 | SvIVX(namesv) = 0; /* max */ |
335 | |
dd2155a4 |
336 | if (!PL_min_intro_pending) |
337 | PL_min_intro_pending = offset; |
338 | PL_max_intro_pending = offset; |
f3548bdc |
339 | /* XXX DAPM since slot has been allocated, replace |
340 | * av_store with PL_curpad[offset] ? */ |
dd2155a4 |
341 | if (*name == '@') |
342 | av_store(PL_comppad, offset, (SV*)newAV()); |
343 | else if (*name == '%') |
344 | av_store(PL_comppad, offset, (SV*)newHV()); |
345 | SvPADMY_on(PL_curpad[offset]); |
346 | } |
347 | |
348 | return offset; |
349 | } |
350 | |
351 | |
352 | |
353 | |
354 | /* |
355 | =for apidoc pad_alloc |
356 | |
357 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto |
358 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards |
359 | for a slot which has no name and and no active value. |
360 | |
361 | =cut |
362 | */ |
363 | |
364 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), |
365 | * or at least rationalise ??? */ |
366 | |
367 | |
368 | PADOFFSET |
369 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) |
370 | { |
371 | SV *sv; |
372 | I32 retval; |
373 | |
f3548bdc |
374 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
375 | |
dd2155a4 |
376 | if (AvARRAY(PL_comppad) != PL_curpad) |
377 | Perl_croak(aTHX_ "panic: pad_alloc"); |
378 | if (PL_pad_reset_pending) |
379 | pad_reset(); |
380 | if (tmptype & SVs_PADMY) { |
235cc2e3 |
381 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
dd2155a4 |
382 | retval = AvFILLp(PL_comppad); |
383 | } |
384 | else { |
385 | SV **names = AvARRAY(PL_comppad_name); |
386 | SSize_t names_fill = AvFILLp(PL_comppad_name); |
387 | for (;;) { |
388 | /* |
389 | * "foreach" index vars temporarily become aliases to non-"my" |
390 | * values. Thus we must skip, not just pad values that are |
391 | * marked as current pad values, but also those with names. |
392 | */ |
393 | /* HVDS why copy to sv here? we don't seem to use it */ |
394 | if (++PL_padix <= names_fill && |
395 | (sv = names[PL_padix]) && sv != &PL_sv_undef) |
396 | continue; |
397 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); |
398 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && |
399 | !IS_PADGV(sv) && !IS_PADCONST(sv)) |
400 | break; |
401 | } |
402 | retval = PL_padix; |
403 | } |
404 | SvFLAGS(sv) |= tmptype; |
405 | PL_curpad = AvARRAY(PL_comppad); |
406 | |
407 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
408 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", |
409 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, |
410 | PL_op_name[optype])); |
411 | return (PADOFFSET)retval; |
412 | } |
413 | |
414 | /* |
415 | =for apidoc pad_add_anon |
416 | |
417 | Add an anon code entry to the current compiling pad |
418 | |
419 | =cut |
420 | */ |
421 | |
422 | PADOFFSET |
423 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) |
424 | { |
425 | PADOFFSET ix; |
426 | SV* name; |
427 | |
428 | name = NEWSV(1106, 0); |
429 | sv_upgrade(name, SVt_PVNV); |
430 | sv_setpvn(name, "&", 1); |
431 | SvIVX(name) = -1; |
432 | SvNVX(name) = 1; |
433 | ix = pad_alloc(op_type, SVs_PADMY); |
434 | av_store(PL_comppad_name, ix, name); |
f3548bdc |
435 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 |
436 | av_store(PL_comppad, ix, sv); |
437 | SvPADMY_on(sv); |
7dafbf52 |
438 | |
439 | /* to avoid ref loops, we never have parent + child referencing each |
440 | * other simultaneously */ |
441 | if (CvOUTSIDE((CV*)sv)) { |
442 | assert(!CvWEAKOUTSIDE((CV*)sv)); |
443 | CvWEAKOUTSIDE_on((CV*)sv); |
444 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); |
445 | } |
dd2155a4 |
446 | return ix; |
447 | } |
448 | |
449 | |
450 | |
451 | /* |
452 | =for apidoc pad_check_dup |
453 | |
454 | Check for duplicate declarations: report any of: |
455 | * a my in the current scope with the same name; |
456 | * an our (anywhere in the pad) with the same name and the same stash |
457 | as C<ourstash> |
458 | C<is_our> indicates that the name to check is an 'our' declaration |
459 | |
460 | =cut |
461 | */ |
462 | |
463 | /* XXX DAPM integrate this into pad_add_name ??? */ |
464 | |
465 | void |
466 | Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) |
467 | { |
468 | SV **svp, *sv; |
469 | PADOFFSET top, off; |
470 | |
f3548bdc |
471 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
dd2155a4 |
472 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) |
473 | return; /* nothing to check */ |
474 | |
475 | svp = AvARRAY(PL_comppad_name); |
476 | top = AvFILLp(PL_comppad_name); |
477 | /* check the current scope */ |
478 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same |
479 | * type ? */ |
480 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { |
481 | if ((sv = svp[off]) |
482 | && sv != &PL_sv_undef |
ee6cee0c |
483 | && !SvFAKE(sv) |
dd2155a4 |
484 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
485 | && (!is_our |
486 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) |
487 | && strEQ(name, SvPVX(sv))) |
488 | { |
489 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
490 | "\"%s\" variable %s masks earlier declaration in same %s", |
491 | (is_our ? "our" : "my"), |
492 | name, |
493 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); |
494 | --off; |
495 | break; |
496 | } |
497 | } |
498 | /* check the rest of the pad */ |
499 | if (is_our) { |
500 | do { |
501 | if ((sv = svp[off]) |
502 | && sv != &PL_sv_undef |
ee6cee0c |
503 | && !SvFAKE(sv) |
dd2155a4 |
504 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
505 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) |
506 | && strEQ(name, SvPVX(sv))) |
507 | { |
508 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
509 | "\"our\" variable %s redeclared", name); |
510 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
511 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); |
512 | break; |
513 | } |
514 | } while ( off-- > 0 ); |
515 | } |
516 | } |
517 | |
518 | |
519 | |
520 | /* |
521 | =for apidoc pad_findmy |
522 | |
523 | Given a lexical name, try to find its offset, first in the current pad, |
524 | or failing that, in the pads of any lexically enclosing subs (including |
525 | the complications introduced by eval). If the name is found in an outer pad, |
526 | then a fake entry is added to the current pad. |
527 | Returns the offset in the current pad, or NOT_IN_PAD on failure. |
528 | |
529 | =cut |
530 | */ |
531 | |
532 | PADOFFSET |
533 | Perl_pad_findmy(pTHX_ char *name) |
534 | { |
535 | I32 off; |
ee6cee0c |
536 | I32 fake_off = 0; |
dd2155a4 |
537 | SV *sv; |
538 | SV **svp = AvARRAY(PL_comppad_name); |
539 | U32 seq = PL_cop_seqmax; |
dd2155a4 |
540 | |
f3548bdc |
541 | ASSERT_CURPAD_ACTIVE("pad_findmy"); |
dd2155a4 |
542 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad findmy: \"%s\"\n", name)); |
543 | |
dd2155a4 |
544 | /* The one we're looking for is probably just before comppad_name_fill. */ |
545 | for (off = AvFILLp(PL_comppad_name); off > 0; off--) { |
ee6cee0c |
546 | sv = svp[off]; |
547 | if (!sv || sv == &PL_sv_undef || !strEQ(SvPVX(sv), name)) |
548 | continue; |
549 | if (SvFAKE(sv)) { |
550 | /* we'll use this later if we don't find a real entry */ |
551 | fake_off = off; |
552 | continue; |
553 | } |
554 | else { |
555 | if ( |
556 | ( seq > (U32)I_32(SvNVX(sv)) /* min */ |
557 | && seq <= (U32)SvIVX(sv)) /* max */ |
558 | || |
559 | /* 'our' is visible before introduction */ |
560 | (!SvIVX(sv) && (SvFLAGS(sv) & SVpad_OUR)) |
561 | ) |
562 | return off; |
dd2155a4 |
563 | } |
564 | } |
ee6cee0c |
565 | if (fake_off) |
566 | return fake_off; |
dd2155a4 |
567 | |
dd2155a4 |
568 | /* See if it's in a nested scope */ |
a3985cdc |
569 | off = pad_findlex(name, 0, PL_compcv); |
dd2155a4 |
570 | if (!off) /* pad_findlex returns 0 for failure...*/ |
571 | return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */ |
572 | |
dd2155a4 |
573 | return off; |
574 | } |
575 | |
576 | |
577 | |
578 | /* |
579 | =for apidoc pad_findlex |
580 | |
581 | Find a named lexical anywhere in a chain of nested pads. Add fake entries |
a3985cdc |
582 | in the inner pads if it's found in an outer one. innercv is the CV *inside* |
583 | the chain of outer CVs to be searched. If newoff is non-null, this is a |
584 | run-time cloning: don't add fake entries, just find the lexical and add a |
585 | ref to it at newoff in the current pad. |
dd2155a4 |
586 | |
587 | =cut |
588 | */ |
589 | |
dd2155a4 |
590 | STATIC PADOFFSET |
a3985cdc |
591 | S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, CV* innercv) |
dd2155a4 |
592 | { |
593 | CV *cv; |
ee6cee0c |
594 | I32 off = 0; |
dd2155a4 |
595 | SV *sv; |
a3985cdc |
596 | CV* startcv; |
597 | U32 seq; |
ee6cee0c |
598 | I32 depth; |
599 | AV *oldpad; |
600 | SV *oldsv; |
601 | AV *curlist; |
dd2155a4 |
602 | |
f3548bdc |
603 | ASSERT_CURPAD_ACTIVE("pad_findlex"); |
dd2155a4 |
604 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
a3985cdc |
605 | "Pad findlex: \"%s\" off=%ld startcv=0x%"UVxf"\n", |
606 | name, (long)newoff, PTR2UV(innercv)) |
dd2155a4 |
607 | ); |
608 | |
a3985cdc |
609 | seq = CvOUTSIDE_SEQ(innercv); |
610 | startcv = CvOUTSIDE(innercv); |
611 | |
612 | for (cv = startcv; cv; seq = CvOUTSIDE_SEQ(cv), cv = CvOUTSIDE(cv)) { |
ee6cee0c |
613 | SV **svp; |
dd2155a4 |
614 | AV *curname; |
ee6cee0c |
615 | I32 fake_off = 0; |
dd2155a4 |
616 | |
617 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
a3985cdc |
618 | " searching: cv=0x%"UVxf" seq=%d\n", |
619 | PTR2UV(cv), (int) seq ) |
dd2155a4 |
620 | ); |
621 | |
ee6cee0c |
622 | curlist = CvPADLIST(cv); |
7dafbf52 |
623 | if (!curlist) |
624 | continue; /* an undef CV */ |
ee6cee0c |
625 | svp = av_fetch(curlist, 0, FALSE); |
dd2155a4 |
626 | if (!svp || *svp == &PL_sv_undef) |
627 | continue; |
628 | curname = (AV*)*svp; |
629 | svp = AvARRAY(curname); |
ee6cee0c |
630 | |
631 | depth = CvDEPTH(cv); |
dd2155a4 |
632 | for (off = AvFILLp(curname); off > 0; off--) { |
ee6cee0c |
633 | sv = svp[off]; |
634 | if (!sv || sv == &PL_sv_undef || !strEQ(SvPVX(sv), name)) |
635 | continue; |
636 | if (SvFAKE(sv)) { |
637 | /* we'll use this later if we don't find a real entry */ |
638 | fake_off = off; |
dd2155a4 |
639 | continue; |
dd2155a4 |
640 | } |
ee6cee0c |
641 | else { |
642 | if ( seq > (U32)I_32(SvNVX(sv)) /* min */ |
643 | && seq <= (U32)SvIVX(sv) /* max */ |
644 | && !(newoff && !depth) /* ignore inactive when cloning */ |
645 | ) |
646 | goto found; |
647 | } |
648 | } |
649 | |
650 | /* no real entry - but did we find a fake one? */ |
651 | if (fake_off) { |
652 | if (newoff && !depth) |
653 | return 0; /* don't clone from inactive stack frame */ |
654 | off = fake_off; |
655 | sv = svp[off]; |
656 | goto found; |
657 | } |
658 | } |
659 | return 0; |
dd2155a4 |
660 | |
ee6cee0c |
661 | found: |
dd2155a4 |
662 | |
ee6cee0c |
663 | if (!depth) |
664 | depth = 1; |
dd2155a4 |
665 | |
ee6cee0c |
666 | oldpad = (AV*)AvARRAY(curlist)[depth]; |
667 | oldsv = *av_fetch(oldpad, off, TRUE); |
668 | |
669 | #ifdef DEBUGGING |
670 | if (SvFAKE(sv)) |
671 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
672 | " matched: offset %ld" |
673 | " FAKE, sv=0x%"UVxf"\n", |
674 | (long)off, |
675 | PTR2UV(oldsv) |
676 | ) |
677 | ); |
678 | else |
679 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
680 | " matched: offset %ld" |
681 | " (%lu,%lu), sv=0x%"UVxf"\n", |
682 | (long)off, |
683 | (unsigned long)I_32(SvNVX(sv)), |
684 | (unsigned long)SvIVX(sv), |
685 | PTR2UV(oldsv) |
686 | ) |
687 | ); |
688 | #endif |
689 | |
690 | if (!newoff) { /* Not a mere clone operation. */ |
691 | newoff = pad_add_name( |
692 | SvPVX(sv), |
693 | (SvFLAGS(sv) & SVpad_TYPED) ? SvSTASH(sv) : Nullhv, |
694 | (SvFLAGS(sv) & SVpad_OUR) ? GvSTASH(sv) : Nullhv, |
695 | 1 /* fake */ |
696 | ); |
dd2155a4 |
697 | |
ee6cee0c |
698 | if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) { |
699 | /* "It's closures all the way down." */ |
700 | CvCLONE_on(PL_compcv); |
701 | if (cv == startcv) { |
702 | if (CvANON(PL_compcv)) |
703 | oldsv = Nullsv; /* no need to keep ref */ |
704 | } |
705 | else { |
706 | CV *bcv; |
707 | for (bcv = startcv; |
708 | bcv && bcv != cv && !CvCLONE(bcv); |
709 | bcv = CvOUTSIDE(bcv)) |
710 | { |
711 | if (CvANON(bcv)) { |
712 | /* install the missing pad entry in intervening |
713 | * nested subs and mark them cloneable. */ |
714 | AV *ocomppad_name = PL_comppad_name; |
715 | PAD *ocomppad = PL_comppad; |
716 | AV *padlist = CvPADLIST(bcv); |
717 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
718 | PL_comppad = (AV*)AvARRAY(padlist)[1]; |
719 | PL_curpad = AvARRAY(PL_comppad); |
720 | pad_add_name( |
721 | SvPVX(sv), |
722 | (SvFLAGS(sv) & SVpad_TYPED) |
723 | ? SvSTASH(sv) : Nullhv, |
724 | (SvFLAGS(sv) & SVpad_OUR) |
725 | ? GvSTASH(sv) : Nullhv, |
726 | 1 /* fake */ |
727 | ); |
728 | |
729 | PL_comppad_name = ocomppad_name; |
730 | PL_comppad = ocomppad; |
731 | PL_curpad = ocomppad ? |
732 | AvARRAY(ocomppad) : Null(SV **); |
733 | CvCLONE_on(bcv); |
dd2155a4 |
734 | } |
735 | else { |
ee6cee0c |
736 | if (ckWARN(WARN_CLOSURE) |
737 | && !CvUNIQUE(bcv) && !CvUNIQUE(cv)) |
dd2155a4 |
738 | { |
ee6cee0c |
739 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
740 | "Variable \"%s\" may be unavailable", |
741 | name); |
dd2155a4 |
742 | } |
ee6cee0c |
743 | break; |
dd2155a4 |
744 | } |
745 | } |
746 | } |
ee6cee0c |
747 | } |
748 | else if (!CvUNIQUE(PL_compcv)) { |
749 | if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv) |
750 | && !(SvFLAGS(sv) & SVpad_OUR)) |
751 | { |
752 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
753 | "Variable \"%s\" will not stay shared", name); |
754 | } |
dd2155a4 |
755 | } |
756 | } |
ee6cee0c |
757 | av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv)); |
758 | ASSERT_CURPAD_ACTIVE("pad_findlex 2"); |
759 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
760 | "Pad findlex: set offset %ld to sv 0x%"UVxf"\n", |
761 | (long)newoff, PTR2UV(oldsv) |
762 | ) |
763 | ); |
764 | return newoff; |
dd2155a4 |
765 | } |
766 | |
767 | |
768 | /* |
769 | =for apidoc pad_sv |
770 | |
771 | Get the value at offset po in the current pad. |
772 | Use macro PAD_SV instead of calling this function directly. |
773 | |
774 | =cut |
775 | */ |
776 | |
777 | |
778 | SV * |
779 | Perl_pad_sv(pTHX_ PADOFFSET po) |
780 | { |
f3548bdc |
781 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 |
782 | |
dd2155a4 |
783 | if (!po) |
784 | Perl_croak(aTHX_ "panic: pad_sv po"); |
dd2155a4 |
785 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
786 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
787 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 |
788 | ); |
789 | return PL_curpad[po]; |
790 | } |
791 | |
792 | |
793 | /* |
794 | =for apidoc pad_setsv |
795 | |
796 | Set the entry at offset po in the current pad to sv. |
797 | Use the macro PAD_SETSV() rather than calling this function directly. |
798 | |
799 | =cut |
800 | */ |
801 | |
802 | #ifdef DEBUGGING |
803 | void |
804 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) |
805 | { |
f3548bdc |
806 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 |
807 | |
808 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
809 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
810 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 |
811 | ); |
812 | PL_curpad[po] = sv; |
813 | } |
814 | #endif |
815 | |
816 | |
817 | |
818 | /* |
819 | =for apidoc pad_block_start |
820 | |
821 | Update the pad compilation state variables on entry to a new block |
822 | |
823 | =cut |
824 | */ |
825 | |
826 | /* XXX DAPM perhaps: |
827 | * - integrate this in general state-saving routine ??? |
828 | * - combine with the state-saving going on in pad_new ??? |
829 | * - introduce a new SAVE type that does all this in one go ? |
830 | */ |
831 | |
832 | void |
833 | Perl_pad_block_start(pTHX_ int full) |
834 | { |
f3548bdc |
835 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 |
836 | SAVEI32(PL_comppad_name_floor); |
837 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); |
838 | if (full) |
839 | PL_comppad_name_fill = PL_comppad_name_floor; |
840 | if (PL_comppad_name_floor < 0) |
841 | PL_comppad_name_floor = 0; |
842 | SAVEI32(PL_min_intro_pending); |
843 | SAVEI32(PL_max_intro_pending); |
844 | PL_min_intro_pending = 0; |
845 | SAVEI32(PL_comppad_name_fill); |
846 | SAVEI32(PL_padix_floor); |
847 | PL_padix_floor = PL_padix; |
848 | PL_pad_reset_pending = FALSE; |
849 | } |
850 | |
851 | |
852 | /* |
853 | =for apidoc intro_my |
854 | |
855 | "Introduce" my variables to visible status. |
856 | |
857 | =cut |
858 | */ |
859 | |
860 | U32 |
861 | Perl_intro_my(pTHX) |
862 | { |
863 | SV **svp; |
864 | SV *sv; |
865 | I32 i; |
866 | |
f3548bdc |
867 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 |
868 | if (! PL_min_intro_pending) |
869 | return PL_cop_seqmax; |
870 | |
871 | svp = AvARRAY(PL_comppad_name); |
872 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { |
ee6cee0c |
873 | if ((sv = svp[i]) && sv != &PL_sv_undef |
874 | && !SvFAKE(sv) && !SvIVX(sv)) |
875 | { |
dd2155a4 |
876 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ |
877 | SvNVX(sv) = (NV)PL_cop_seqmax; |
878 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
879 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", |
880 | (long)i, SvPVX(sv), |
881 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) |
882 | ); |
883 | } |
884 | } |
885 | PL_min_intro_pending = 0; |
886 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ |
887 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
888 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); |
889 | |
890 | return PL_cop_seqmax++; |
891 | } |
892 | |
893 | /* |
894 | =for apidoc pad_leavemy |
895 | |
896 | Cleanup at end of scope during compilation: set the max seq number for |
897 | lexicals in this scope and warn of any lexicals that never got introduced. |
898 | |
899 | =cut |
900 | */ |
901 | |
902 | void |
903 | Perl_pad_leavemy(pTHX) |
904 | { |
905 | I32 off; |
906 | SV **svp = AvARRAY(PL_comppad_name); |
907 | SV *sv; |
908 | |
909 | PL_pad_reset_pending = FALSE; |
910 | |
f3548bdc |
911 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 |
912 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
913 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { |
ee6cee0c |
914 | if ((sv = svp[off]) && sv != &PL_sv_undef |
915 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) |
dd2155a4 |
916 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
917 | "%s never introduced", SvPVX(sv)); |
918 | } |
919 | } |
920 | /* "Deintroduce" my variables that are leaving with this scope. */ |
921 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { |
ee6cee0c |
922 | if ((sv = svp[off]) && sv != &PL_sv_undef |
923 | && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) |
924 | { |
dd2155a4 |
925 | SvIVX(sv) = PL_cop_seqmax; |
926 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
927 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", |
928 | (long)off, SvPVX(sv), |
929 | (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) |
930 | ); |
931 | } |
932 | } |
933 | PL_cop_seqmax++; |
934 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
935 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); |
936 | } |
937 | |
938 | |
939 | /* |
940 | =for apidoc pad_swipe |
941 | |
942 | Abandon the tmp in the current pad at offset po and replace with a |
943 | new one. |
944 | |
945 | =cut |
946 | */ |
947 | |
948 | void |
949 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) |
950 | { |
f3548bdc |
951 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 |
952 | if (!PL_curpad) |
953 | return; |
954 | if (AvARRAY(PL_comppad) != PL_curpad) |
955 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); |
956 | if (!po) |
957 | Perl_croak(aTHX_ "panic: pad_swipe po"); |
958 | |
959 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
960 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", |
961 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); |
962 | |
963 | if (PL_curpad[po]) |
964 | SvPADTMP_off(PL_curpad[po]); |
965 | if (refadjust) |
966 | SvREFCNT_dec(PL_curpad[po]); |
967 | |
968 | PL_curpad[po] = NEWSV(1107,0); |
969 | SvPADTMP_on(PL_curpad[po]); |
970 | if ((I32)po < PL_padix) |
971 | PL_padix = po - 1; |
972 | } |
973 | |
974 | |
975 | /* |
976 | =for apidoc pad_reset |
977 | |
978 | Mark all the current temporaries for reuse |
979 | |
980 | =cut |
981 | */ |
982 | |
983 | /* XXX pad_reset() is currently disabled because it results in serious bugs. |
984 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed |
985 | * on the stack by OPs that use them, there are several ways to get an alias |
986 | * to a shared TARG. Such an alias will change randomly and unpredictably. |
987 | * We avoid doing this until we can think of a Better Way. |
988 | * GSAR 97-10-29 */ |
989 | void |
990 | Perl_pad_reset(pTHX) |
991 | { |
992 | #ifdef USE_BROKEN_PAD_RESET |
993 | register I32 po; |
994 | |
995 | if (AvARRAY(PL_comppad) != PL_curpad) |
996 | Perl_croak(aTHX_ "panic: pad_reset curpad"); |
997 | |
998 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
999 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", |
1000 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), |
1001 | (long)PL_padix, (long)PL_padix_floor |
1002 | ) |
1003 | ); |
1004 | |
1005 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ |
1006 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1007 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) |
1008 | SvPADTMP_off(PL_curpad[po]); |
1009 | } |
1010 | PL_padix = PL_padix_floor; |
1011 | } |
1012 | #endif |
1013 | PL_pad_reset_pending = FALSE; |
1014 | } |
1015 | |
1016 | |
1017 | /* |
1018 | =for apidoc pad_tidy |
1019 | |
1020 | Tidy up a pad after we've finished compiling it: |
1021 | * remove most stuff from the pads of anonsub prototypes; |
1022 | * give it a @_; |
1023 | * mark tmps as such. |
1024 | |
1025 | =cut |
1026 | */ |
1027 | |
1028 | /* XXX DAPM surely most of this stuff should be done properly |
1029 | * at the right time beforehand, rather than going around afterwards |
1030 | * cleaning up our mistakes ??? |
1031 | */ |
1032 | |
1033 | void |
1034 | Perl_pad_tidy(pTHX_ padtidy_type type) |
1035 | { |
1036 | PADOFFSET ix; |
1037 | |
f3548bdc |
1038 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
dd2155a4 |
1039 | /* extend curpad to match namepad */ |
1040 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) |
1041 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); |
1042 | |
1043 | if (type == padtidy_SUBCLONE) { |
1044 | SV **namep = AvARRAY(PL_comppad_name); |
1045 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1046 | SV *namesv; |
1047 | |
1048 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1049 | continue; |
1050 | /* |
1051 | * The only things that a clonable function needs in its |
1052 | * pad are references to outer lexicals and anonymous subs. |
1053 | * The rest are created anew during cloning. |
1054 | */ |
1055 | if (!((namesv = namep[ix]) != Nullsv && |
1056 | namesv != &PL_sv_undef && |
1057 | (SvFAKE(namesv) || |
1058 | *SvPVX(namesv) == '&'))) |
1059 | { |
1060 | SvREFCNT_dec(PL_curpad[ix]); |
1061 | PL_curpad[ix] = Nullsv; |
1062 | } |
1063 | } |
1064 | } |
1065 | else if (type == padtidy_SUB) { |
1066 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ |
1067 | AV *av = newAV(); /* Will be @_ */ |
1068 | av_extend(av, 0); |
1069 | av_store(PL_comppad, 0, (SV*)av); |
1070 | AvFLAGS(av) = AVf_REIFY; |
1071 | } |
1072 | |
1073 | /* XXX DAPM rationalise these two similar branches */ |
1074 | |
1075 | if (type == padtidy_SUB) { |
1076 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1077 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1078 | continue; |
1079 | if (!SvPADMY(PL_curpad[ix])) |
1080 | SvPADTMP_on(PL_curpad[ix]); |
1081 | } |
1082 | } |
1083 | else if (type == padtidy_FORMAT) { |
1084 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1085 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) |
1086 | SvPADTMP_on(PL_curpad[ix]); |
1087 | } |
1088 | } |
f3548bdc |
1089 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 |
1090 | } |
1091 | |
1092 | |
1093 | /* |
1094 | =for apidoc pad_free |
1095 | |
1096 | Free the SV at offet po in the current pad. |
1097 | |
1098 | =cut |
1099 | */ |
1100 | |
1101 | /* XXX DAPM integrate with pad_swipe ???? */ |
1102 | void |
1103 | Perl_pad_free(pTHX_ PADOFFSET po) |
1104 | { |
f3548bdc |
1105 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 |
1106 | if (!PL_curpad) |
1107 | return; |
1108 | if (AvARRAY(PL_comppad) != PL_curpad) |
1109 | Perl_croak(aTHX_ "panic: pad_free curpad"); |
1110 | if (!po) |
1111 | Perl_croak(aTHX_ "panic: pad_free po"); |
1112 | |
1113 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1114 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", |
1115 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) |
1116 | ); |
1117 | |
1118 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { |
1119 | SvPADTMP_off(PL_curpad[po]); |
1120 | #ifdef USE_ITHREADS |
7e736055 |
1121 | /* SV could be a shared hash key (eg bugid #19022) */ |
1122 | if ( |
dd2155a4 |
1123 | #ifdef PERL_COPY_ON_WRITE |
7e736055 |
1124 | !SvIsCOW(PL_curpad[po]) |
1125 | #else |
1126 | !SvFAKE(PL_curpad[po]) |
dd2155a4 |
1127 | #endif |
7e736055 |
1128 | ) |
dd2155a4 |
1129 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 |
1130 | #endif |
1131 | } |
1132 | if ((I32)po < PL_padix) |
1133 | PL_padix = po - 1; |
1134 | } |
1135 | |
1136 | |
1137 | |
1138 | /* |
1139 | =for apidoc do_dump_pad |
1140 | |
1141 | Dump the contents of a padlist |
1142 | |
1143 | =cut |
1144 | */ |
1145 | |
1146 | void |
1147 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) |
1148 | { |
1149 | AV *pad_name; |
1150 | AV *pad; |
1151 | SV **pname; |
1152 | SV **ppad; |
1153 | SV *namesv; |
1154 | I32 ix; |
1155 | |
1156 | if (!padlist) { |
1157 | return; |
1158 | } |
1159 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); |
1160 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); |
1161 | pname = AvARRAY(pad_name); |
1162 | ppad = AvARRAY(pad); |
1163 | Perl_dump_indent(aTHX_ level, file, |
1164 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", |
1165 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) |
1166 | ); |
1167 | |
1168 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { |
1169 | namesv = pname[ix]; |
1170 | if (namesv && namesv == &PL_sv_undef) { |
1171 | namesv = Nullsv; |
1172 | } |
1173 | if (namesv) { |
ee6cee0c |
1174 | if (SvFAKE(namesv)) |
1175 | Perl_dump_indent(aTHX_ level+1, file, |
1176 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\"\n", |
1177 | (int) ix, |
1178 | PTR2UV(ppad[ix]), |
1179 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
1180 | SvPVX(namesv) |
1181 | ); |
1182 | else |
1183 | Perl_dump_indent(aTHX_ level+1, file, |
1184 | "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n", |
1185 | (int) ix, |
1186 | PTR2UV(ppad[ix]), |
1187 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
1188 | (unsigned long)I_32(SvNVX(namesv)), |
1189 | (unsigned long)SvIVX(namesv), |
1190 | SvPVX(namesv) |
1191 | ); |
dd2155a4 |
1192 | } |
1193 | else if (full) { |
1194 | Perl_dump_indent(aTHX_ level+1, file, |
1195 | "%2d. 0x%"UVxf"<%lu>\n", |
1196 | (int) ix, |
1197 | PTR2UV(ppad[ix]), |
1198 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) |
1199 | ); |
1200 | } |
1201 | } |
1202 | } |
1203 | |
1204 | |
1205 | |
1206 | /* |
1207 | =for apidoc cv_dump |
1208 | |
1209 | dump the contents of a CV |
1210 | |
1211 | =cut |
1212 | */ |
1213 | |
1214 | #ifdef DEBUGGING |
1215 | STATIC void |
1216 | S_cv_dump(pTHX_ CV *cv, char *title) |
1217 | { |
1218 | CV *outside = CvOUTSIDE(cv); |
1219 | AV* padlist = CvPADLIST(cv); |
1220 | |
1221 | PerlIO_printf(Perl_debug_log, |
1222 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", |
1223 | title, |
1224 | PTR2UV(cv), |
1225 | (CvANON(cv) ? "ANON" |
1226 | : (cv == PL_main_cv) ? "MAIN" |
1227 | : CvUNIQUE(cv) ? "UNIQUE" |
1228 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), |
1229 | PTR2UV(outside), |
1230 | (!outside ? "null" |
1231 | : CvANON(outside) ? "ANON" |
1232 | : (outside == PL_main_cv) ? "MAIN" |
1233 | : CvUNIQUE(outside) ? "UNIQUE" |
1234 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); |
1235 | |
1236 | PerlIO_printf(Perl_debug_log, |
1237 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); |
1238 | do_dump_pad(1, Perl_debug_log, padlist, 1); |
1239 | } |
1240 | #endif /* DEBUGGING */ |
1241 | |
1242 | |
1243 | |
1244 | |
1245 | |
1246 | /* |
1247 | =for apidoc cv_clone |
1248 | |
1249 | Clone a CV: make a new CV which points to the same code etc, but which |
1250 | has a newly-created pad built by copying the prototype pad and capturing |
1251 | any outer lexicals. |
1252 | |
1253 | =cut |
1254 | */ |
1255 | |
1256 | CV * |
1257 | Perl_cv_clone(pTHX_ CV *proto) |
1258 | { |
1259 | CV *cv; |
1260 | |
1261 | LOCK_CRED_MUTEX; /* XXX create separate mutex */ |
1262 | cv = cv_clone2(proto, CvOUTSIDE(proto)); |
1263 | UNLOCK_CRED_MUTEX; /* XXX create separate mutex */ |
1264 | return cv; |
1265 | } |
1266 | |
1267 | |
1268 | /* XXX DAPM separate out cv and paddish bits ??? |
1269 | * ideally the CV-related stuff shouldn't be in pad.c - how about |
1270 | * a cv.c? */ |
1271 | |
1272 | STATIC CV * |
1273 | S_cv_clone2(pTHX_ CV *proto, CV *outside) |
1274 | { |
1275 | I32 ix; |
1276 | AV* protopadlist = CvPADLIST(proto); |
1277 | AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); |
1278 | AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); |
1279 | SV** pname = AvARRAY(protopad_name); |
1280 | SV** ppad = AvARRAY(protopad); |
1281 | I32 fname = AvFILLp(protopad_name); |
1282 | I32 fpad = AvFILLp(protopad); |
1283 | AV* comppadlist; |
1284 | CV* cv; |
1285 | |
1286 | assert(!CvUNIQUE(proto)); |
1287 | |
1288 | ENTER; |
1289 | SAVESPTR(PL_compcv); |
1290 | |
1291 | cv = PL_compcv = (CV*)NEWSV(1104, 0); |
1292 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
7dafbf52 |
1293 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 |
1294 | CvCLONED_on(cv); |
1295 | |
dd2155a4 |
1296 | #ifdef USE_ITHREADS |
1297 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) |
1298 | : savepv(CvFILE(proto)); |
1299 | #else |
1300 | CvFILE(cv) = CvFILE(proto); |
1301 | #endif |
1302 | CvGV(cv) = CvGV(proto); |
1303 | CvSTASH(cv) = CvSTASH(proto); |
1304 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
1305 | CvSTART(cv) = CvSTART(proto); |
a3985cdc |
1306 | if (outside) { |
dd2155a4 |
1307 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
a3985cdc |
1308 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
1309 | } |
dd2155a4 |
1310 | |
1311 | if (SvPOK(proto)) |
1312 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); |
1313 | |
1314 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); |
1315 | |
1316 | for (ix = fname; ix >= 0; ix--) |
1317 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); |
1318 | |
1319 | av_fill(PL_comppad, fpad); |
1320 | PL_curpad = AvARRAY(PL_comppad); |
1321 | |
1322 | for (ix = fpad; ix > 0; ix--) { |
1323 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
1324 | if (namesv && namesv != &PL_sv_undef) { |
1325 | char *name = SvPVX(namesv); /* XXX */ |
1326 | if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */ |
a3985cdc |
1327 | I32 off = pad_findlex(name, ix, cv); |
dd2155a4 |
1328 | if (!off) |
1329 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); |
1330 | else if (off != ix) |
1331 | Perl_croak(aTHX_ "panic: cv_clone: %s", name); |
1332 | } |
1333 | else { /* our own lexical */ |
1334 | SV* sv; |
1335 | if (*name == '&') { |
1336 | /* anon code -- we'll come back for it */ |
1337 | sv = SvREFCNT_inc(ppad[ix]); |
1338 | } |
1339 | else if (*name == '@') |
1340 | sv = (SV*)newAV(); |
1341 | else if (*name == '%') |
1342 | sv = (SV*)newHV(); |
1343 | else |
1344 | sv = NEWSV(0, 0); |
235cc2e3 |
1345 | SvPADMY_on(sv); |
dd2155a4 |
1346 | PL_curpad[ix] = sv; |
1347 | } |
1348 | } |
1349 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { |
1350 | PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); |
1351 | } |
1352 | else { |
1353 | SV* sv = NEWSV(0, 0); |
1354 | SvPADTMP_on(sv); |
1355 | PL_curpad[ix] = sv; |
1356 | } |
1357 | } |
1358 | |
1359 | /* Now that vars are all in place, clone nested closures. */ |
1360 | |
1361 | for (ix = fpad; ix > 0; ix--) { |
1362 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
1363 | if (namesv |
1364 | && namesv != &PL_sv_undef |
1365 | && !(SvFLAGS(namesv) & SVf_FAKE) |
1366 | && *SvPVX(namesv) == '&' |
1367 | && CvCLONE(ppad[ix])) |
1368 | { |
1369 | CV *kid = cv_clone2((CV*)ppad[ix], cv); |
1370 | SvREFCNT_dec(ppad[ix]); |
1371 | CvCLONE_on(kid); |
1372 | SvPADMY_on(kid); |
1373 | PL_curpad[ix] = (SV*)kid; |
7dafbf52 |
1374 | /* '&' entry points to child, so child mustn't refcnt parent */ |
1375 | CvWEAKOUTSIDE_on(kid); |
1376 | SvREFCNT_dec(cv); |
dd2155a4 |
1377 | } |
1378 | } |
1379 | |
1380 | DEBUG_Xv( |
1381 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); |
1382 | cv_dump(outside, "Outside"); |
1383 | cv_dump(proto, "Proto"); |
1384 | cv_dump(cv, "To"); |
1385 | ); |
1386 | |
1387 | LEAVE; |
1388 | |
1389 | if (CvCONST(cv)) { |
1390 | SV* const_sv = op_const_sv(CvSTART(cv), cv); |
1391 | assert(const_sv); |
1392 | /* constant sub () { $x } closing over $x - see lib/constant.pm */ |
1393 | SvREFCNT_dec(cv); |
1394 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); |
1395 | } |
1396 | |
1397 | return cv; |
1398 | } |
1399 | |
1400 | |
1401 | /* |
1402 | =for apidoc pad_fixup_inner_anons |
1403 | |
1404 | For any anon CVs in the pad, change CvOUTSIDE of that CV from |
7dafbf52 |
1405 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1406 | moved to a pre-existing CV struct. |
dd2155a4 |
1407 | |
1408 | =cut |
1409 | */ |
1410 | |
1411 | void |
1412 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) |
1413 | { |
1414 | I32 ix; |
1415 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
1416 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
1417 | SV **namepad = AvARRAY(comppad_name); |
1418 | SV **curpad = AvARRAY(comppad); |
1419 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
1420 | SV *namesv = namepad[ix]; |
1421 | if (namesv && namesv != &PL_sv_undef |
1422 | && *SvPVX(namesv) == '&') |
1423 | { |
1424 | CV *innercv = (CV*)curpad[ix]; |
7dafbf52 |
1425 | assert(CvWEAKOUTSIDE(innercv)); |
1426 | assert(CvOUTSIDE(innercv) == old_cv); |
1427 | CvOUTSIDE(innercv) = new_cv; |
dd2155a4 |
1428 | } |
1429 | } |
1430 | } |
1431 | |
7dafbf52 |
1432 | |
dd2155a4 |
1433 | /* |
1434 | =for apidoc pad_push |
1435 | |
1436 | Push a new pad frame onto the padlist, unless there's already a pad at |
1437 | this depth, in which case don't bother creating a new one. |
1438 | If has_args is true, give the new pad an @_ in slot zero. |
1439 | |
1440 | =cut |
1441 | */ |
1442 | |
1443 | void |
1444 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) |
1445 | { |
1446 | if (depth <= AvFILLp(padlist)) |
1447 | return; |
1448 | |
1449 | { |
1450 | SV** svp = AvARRAY(padlist); |
1451 | AV *newpad = newAV(); |
1452 | SV **oldpad = AvARRAY(svp[depth-1]); |
1453 | I32 ix = AvFILLp((AV*)svp[1]); |
1454 | I32 names_fill = AvFILLp((AV*)svp[0]); |
1455 | SV** names = AvARRAY(svp[0]); |
1456 | SV* sv; |
1457 | for ( ;ix > 0; ix--) { |
1458 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
1459 | char *name = SvPVX(names[ix]); |
1460 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || *name == '&') { |
1461 | /* outer lexical or anon code */ |
1462 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
1463 | } |
1464 | else { /* our own lexical */ |
1465 | if (*name == '@') |
1466 | av_store(newpad, ix, sv = (SV*)newAV()); |
1467 | else if (*name == '%') |
1468 | av_store(newpad, ix, sv = (SV*)newHV()); |
1469 | else |
1470 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1471 | SvPADMY_on(sv); |
1472 | } |
1473 | } |
1474 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
1475 | av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix])); |
1476 | } |
1477 | else { |
1478 | /* save temporaries on recursion? */ |
1479 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1480 | SvPADTMP_on(sv); |
1481 | } |
1482 | } |
1483 | if (has_args) { |
1484 | AV* av = newAV(); |
1485 | av_extend(av, 0); |
1486 | av_store(newpad, 0, (SV*)av); |
1487 | AvFLAGS(av) = AVf_REIFY; |
1488 | } |
1489 | av_store(padlist, depth, (SV*)newpad); |
1490 | AvFILLp(padlist) = depth; |
1491 | } |
1492 | } |