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dd2155a4 DM |
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 DM |
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 DM |
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 DM |
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 DM |
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 DM |
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 DM |
115 | { |
116 | AV *padlist, *padname, *pad, *a0; | |
117 | ||
f3548bdc DM |
118 | ASSERT_CURPAD_LEGAL("pad_new"); |
119 | ||
dd2155a4 DM |
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 DM |
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 DM |
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 DM |
201 | (This function should really be called pad_free, but the name was already |
202 | taken) | |
203 | ||
dd2155a4 DM |
204 | =cut |
205 | */ | |
206 | ||
207 | void | |
a3985cdc | 208 | Perl_pad_undef(pTHX_ CV* cv) |
dd2155a4 DM |
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 DM |
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 DM |
228 | if (!PL_dirty) { /* don't bother during global destruction */ |
229 | CV *outercv = CvOUTSIDE(cv); | |
230 | U32 seq = CvOUTSIDE_SEQ(cv); | |
dd2155a4 DM |
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 DM |
239 | { |
240 | CV *innercv = (CV*)curpad[ix]; | |
7dafbf52 DM |
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 DM |
246 | && CvOUTSIDE(innercv) == cv) |
247 | { | |
7dafbf52 DM |
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 DM |
253 | } |
254 | } | |
255 | } | |
256 | } | |
7dafbf52 | 257 | |
dd2155a4 DM |
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 DM |
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 | |
f3548bdc DM |
307 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
308 | ||
dd2155a4 DM |
309 | |
310 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
ee6cee0c DM |
311 | "Pad addname: %ld \"%s\"%s\n", |
312 | (long)offset, name, (fake ? " FAKE" : "") | |
dd2155a4 DM |
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 DM |
329 | if (fake) |
330 | SvFAKE_on(namesv); | |
331 | else { | |
ee6cee0c DM |
332 | /* not yet introduced */ |
333 | SvNVX(namesv) = (NV)PAD_MAX; /* min */ | |
334 | SvIVX(namesv) = 0; /* max */ | |
335 | ||
dd2155a4 DM |
336 | if (!PL_min_intro_pending) |
337 | PL_min_intro_pending = offset; | |
338 | PL_max_intro_pending = offset; | |
f3548bdc DM |
339 | /* XXX DAPM since slot has been allocated, replace |
340 | * av_store with PL_curpad[offset] ? */ | |
dd2155a4 DM |
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 DM |
374 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
375 | ||
dd2155a4 DM |
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 DM |
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 DM |
436 | av_store(PL_comppad, ix, sv); |
437 | SvPADMY_on(sv); | |
7dafbf52 DM |
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 DM |
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 DM |
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 DM |
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 DM |
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 DM |
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 DM |
542 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad findmy: \"%s\"\n", name)); |
543 | ||
dd2155a4 DM |
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 DM |
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 DM |
563 | } |
564 | } | |
ee6cee0c DM |
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 DM |
570 | if (!off) /* pad_findlex returns 0 for failure...*/ |
571 | return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */ | |
572 | ||
dd2155a4 DM |
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 DM |
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 DM |
586 | |
587 | =cut | |
588 | */ | |
589 | ||
dd2155a4 | 590 | STATIC PADOFFSET |
a3985cdc | 591 | S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, CV* innercv) |
dd2155a4 DM |
592 | { |
593 | CV *cv; | |
ee6cee0c | 594 | I32 off = 0; |
dd2155a4 | 595 | SV *sv; |
a3985cdc DM |
596 | CV* startcv; |
597 | U32 seq; | |
ee6cee0c DM |
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 DM |
605 | "Pad findlex: \"%s\" off=%ld startcv=0x%"UVxf"\n", |
606 | name, (long)newoff, PTR2UV(innercv)) | |
dd2155a4 DM |
607 | ); |
608 | ||
a3985cdc DM |
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 DM |
616 | |
617 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
a3985cdc DM |
618 | " searching: cv=0x%"UVxf" seq=%d\n", |
619 | PTR2UV(cv), (int) seq ) | |
dd2155a4 DM |
620 | ); |
621 | ||
ee6cee0c | 622 | curlist = CvPADLIST(cv); |
7dafbf52 DM |
623 | if (!curlist) |
624 | continue; /* an undef CV */ | |
ee6cee0c | 625 | svp = av_fetch(curlist, 0, FALSE); |
dd2155a4 DM |
626 | if (!svp || *svp == &PL_sv_undef) |
627 | continue; | |
628 | curname = (AV*)*svp; | |
629 | svp = AvARRAY(curname); | |
ee6cee0c DM |
630 | |
631 | depth = CvDEPTH(cv); | |
dd2155a4 | 632 | for (off = AvFILLp(curname); off > 0; off--) { |
ee6cee0c DM |
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 DM |
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 DM |
663 | if (!depth) |
664 | depth = 1; | |
dd2155a4 | 665 | |
ee6cee0c DM |
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 DM |
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 DM |
734 | } |
735 | else { | |
ee6cee0c DM |
736 | if (ckWARN(WARN_CLOSURE) |
737 | && !CvUNIQUE(bcv) && !CvUNIQUE(cv)) | |
dd2155a4 | 738 | { |
ee6cee0c DM |
739 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
740 | "Variable \"%s\" may be unavailable", | |
741 | name); | |
dd2155a4 | 742 | } |
ee6cee0c | 743 | break; |
dd2155a4 DM |
744 | } |
745 | } | |
746 | } | |
ee6cee0c DM |
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 DM |
755 | } |
756 | } | |
ee6cee0c DM |
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 DM |
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 DM |
783 | if (!po) |
784 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
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 DM |
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 DM |
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 DM |
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 DM |
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 DM |
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 DM |
873 | if ((sv = svp[i]) && sv != &PL_sv_undef |
874 | && !SvFAKE(sv) && !SvIVX(sv)) | |
875 | { | |
dd2155a4 DM |
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 DM |
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 DM |
914 | if ((sv = svp[off]) && sv != &PL_sv_undef |
915 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) | |
dd2155a4 DM |
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 DM |
922 | if ((sv = svp[off]) && sv != &PL_sv_undef |
923 | && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) | |
924 | { | |
dd2155a4 DM |
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 DM |
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 DM |
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 DM |
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 DM |
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 HS |
1121 | /* SV could be a shared hash key (eg bugid #19022) */ |
1122 | if ( | |
dd2155a4 | 1123 | #ifdef PERL_COPY_ON_WRITE |
7e736055 HS |
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 DM |
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 DM |
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 DM |
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 DM |
1294 | CvCLONED_on(cv); |
1295 | ||
dd2155a4 DM |
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 DM |
1308 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
1309 | } | |
dd2155a4 DM |
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 DM |
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 DM |
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 DM |
1374 | /* '&' entry points to child, so child mustn't refcnt parent */ |
1375 | CvWEAKOUTSIDE_on(kid); | |
1376 | SvREFCNT_dec(cv); | |
dd2155a4 DM |
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 DM |
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 DM |
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 DM |
1425 | assert(CvWEAKOUTSIDE(innercv)); |
1426 | assert(CvOUTSIDE(innercv) == old_cv); | |
1427 | CvOUTSIDE(innercv) = new_cv; | |
dd2155a4 DM |
1428 | } |
1429 | } | |
1430 | } | |
1431 | ||
7dafbf52 | 1432 | |
dd2155a4 DM |
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 | } |