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9755d405 JH |
1 | /* pad.c |
2 | * | |
2c351e65 | 3 | * Copyright (C) 2002, 2003, 2004, 2005, 2006, by Larry Wall and others |
9755d405 JH |
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 | ||
40d34c0d SB |
25 | This file contains the functions that create and manipulate scratchpads, |
26 | which are array-of-array data structures attached to a CV (ie a sub) | |
27 | and which store lexical variables and opcode temporary and per-thread | |
28 | values. | |
29 | ||
9755d405 JH |
30 | =for apidoc m|AV *|CvPADLIST|CV *cv |
31 | CV's can have CvPADLIST(cv) set to point to an AV. | |
32 | ||
33 | For these purposes "forms" are a kind-of CV, eval""s are too (except they're | |
34 | not callable at will and are always thrown away after the eval"" is done | |
35 | executing). | |
36 | ||
37 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, | |
38 | but that is really the callers pad (a slot of which is allocated by | |
39 | every entersub). | |
40 | ||
41 | The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items | |
d7afa7f5 | 42 | is managed "manual" (mostly in pad.c) rather than normal av.c rules. |
9755d405 JH |
43 | The items in the AV are not SVs as for a normal AV, but other AVs: |
44 | ||
45 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather | |
46 | the "static type information" for lexicals. | |
47 | ||
48 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that | |
49 | depth of recursion into the CV. | |
50 | The 0'th slot of a frame AV is an AV which is @_. | |
51 | other entries are storage for variables and op targets. | |
52 | ||
53 | During compilation: | |
654c77f7 JH |
54 | C<PL_comppad_name> is set to the names AV. |
55 | C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1. | |
56 | C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)). | |
9755d405 | 57 | |
d7afa7f5 JH |
58 | During execution, C<PL_comppad> and C<PL_curpad> refer to the live |
59 | frame of the currently executing sub. | |
60 | ||
61 | Iterating over the names AV iterates over all possible pad | |
9755d405 JH |
62 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
63 | &PL_sv_undef "names" (see pad_alloc()). | |
64 | ||
65 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. | |
66 | The rest are op targets/GVs/constants which are statically allocated | |
67 | or resolved at compile time. These don't have names by which they | |
68 | can be looked up from Perl code at run time through eval"" like | |
69 | my/our variables can be. Since they can't be looked up by "name" | |
70 | but only by their index allocated at compile time (which is usually | |
71 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. | |
72 | ||
73 | The SVs in the names AV have their PV being the name of the variable. | |
e70aec60 NC |
74 | NV+1..IV inclusive is a range of cop_seq numbers for which the name is valid. |
75 | For typed lexicals name SV is SVt_PVMG and SvSTASH points at the type. For | |
76 | C<our> lexicals, the type is SVt_PVGV, and SvOURSTASH points at the stash of | |
77 | the associated global (so that duplicate C<our> declarations in the same | |
78 | package can be detected)(In 5.8.x and earlier SvOURSTASH is an alias for | |
79 | GvSTASH). SvCUR is sometimes hijacked to store the generation number during | |
80 | compilation. | |
9755d405 JH |
81 | |
82 | If SvFAKE is set on the name SV then slot in the frame AVs are | |
d7afa7f5 JH |
83 | a REFCNT'ed references to a lexical from "outside". In this case, |
84 | the name SV does not have a cop_seq range, since it is in scope | |
85 | throughout. | |
9755d405 | 86 | |
654c77f7 | 87 | If the 'name' is '&' the corresponding entry in frame AV |
9755d405 JH |
88 | is a CV representing a possible closure. |
89 | (SvFAKE and name of '&' is not a meaningful combination currently but could | |
90 | become so if C<my sub foo {}> is implemented.) | |
91 | ||
be0b3d4b NC |
92 | The flag SVf_PADSTALE is cleared on lexicals each time the my() is executed, |
93 | and set on scope exit. This allows the 'Variable $x is not available' warning | |
94 | to be generated in evals, such as | |
95 | ||
96 | { my $x = 1; sub f { eval '$x'} } f(); | |
97 | ||
9755d405 JH |
98 | =cut |
99 | */ | |
100 | ||
101 | ||
102 | #include "EXTERN.h" | |
103 | #define PERL_IN_PAD_C | |
104 | #include "perl.h" | |
105 | ||
aa38d90e NC |
106 | #define COP_SEQ_RANGE_LOW_set(sv,val) SvNV_set(sv, (NV)val) |
107 | #define COP_SEQ_RANGE_HIGH_set(sv,val) SvUV_set(sv, val) | |
9755d405 | 108 | |
aa38d90e NC |
109 | #define PARENT_PAD_INDEX_set(sv,val) SvNV_set(sv, (NV)val) |
110 | #define PARENT_FAKELEX_FLAGS_set(sv,val) SvUV_set(sv, val) | |
111 | ||
b499fd84 | 112 | #define PAD_MAX I32_MAX |
9755d405 JH |
113 | |
114 | ||
115 | ||
116 | /* | |
117 | =for apidoc pad_new | |
118 | ||
119 | Create a new compiling padlist, saving and updating the various global | |
120 | vars at the same time as creating the pad itself. The following flags | |
121 | can be OR'ed together: | |
122 | ||
123 | padnew_CLONE this pad is for a cloned CV | |
124 | padnew_SAVE save old globals | |
125 | padnew_SAVESUB also save extra stuff for start of sub | |
126 | ||
127 | =cut | |
128 | */ | |
129 | ||
130 | PADLIST * | |
131 | Perl_pad_new(pTHX_ int flags) | |
132 | { | |
c05e0e2f | 133 | AV *padlist, *padname, *pad; |
9755d405 | 134 | |
d7afa7f5 JH |
135 | ASSERT_CURPAD_LEGAL("pad_new"); |
136 | ||
9755d405 JH |
137 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
138 | * vars (based on flags) rather than storing vals + addresses for | |
139 | * each individually. Also see pad_block_start. | |
140 | * XXX DAPM Try to see whether all these conditionals are required | |
141 | */ | |
142 | ||
143 | /* save existing state, ... */ | |
144 | ||
145 | if (flags & padnew_SAVE) { | |
146 | SAVECOMPPAD(); | |
147 | SAVESPTR(PL_comppad_name); | |
148 | if (! (flags & padnew_CLONE)) { | |
149 | SAVEI32(PL_padix); | |
150 | SAVEI32(PL_comppad_name_fill); | |
151 | SAVEI32(PL_min_intro_pending); | |
152 | SAVEI32(PL_max_intro_pending); | |
153 | if (flags & padnew_SAVESUB) { | |
154 | SAVEI32(PL_pad_reset_pending); | |
155 | } | |
156 | } | |
157 | } | |
158 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be | |
159 | * saved - check at some pt that this is okay */ | |
160 | ||
161 | /* ... create new pad ... */ | |
162 | ||
163 | padlist = newAV(); | |
164 | padname = newAV(); | |
165 | pad = newAV(); | |
166 | ||
167 | if (flags & padnew_CLONE) { | |
168 | /* XXX DAPM I dont know why cv_clone needs it | |
169 | * doing differently yet - perhaps this separate branch can be | |
170 | * dispensed with eventually ??? | |
171 | */ | |
172 | ||
c05e0e2f | 173 | AV * const a0 = newAV(); /* will be @_ */ |
9755d405 JH |
174 | av_extend(a0, 0); |
175 | av_store(pad, 0, (SV*)a0); | |
176 | AvFLAGS(a0) = AVf_REIFY; | |
177 | } | |
178 | else { | |
179 | #ifdef USE_5005THREADS | |
f011281f | 180 | AV * const a0 = newAV(); /* will be @_ */ |
9755d405 | 181 | av_store(padname, 0, newSVpvn("@_", 2)); |
9755d405 JH |
182 | SvPADMY_on((SV*)a0); /* XXX Needed? */ |
183 | av_store(pad, 0, (SV*)a0); | |
184 | #else | |
0e2d6244 | 185 | av_store(pad, 0, NULL); |
9755d405 JH |
186 | #endif /* USE_THREADS */ |
187 | } | |
188 | ||
189 | AvREAL_off(padlist); | |
190 | av_store(padlist, 0, (SV*)padname); | |
191 | av_store(padlist, 1, (SV*)pad); | |
192 | ||
193 | /* ... then update state variables */ | |
194 | ||
195 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); | |
196 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); | |
197 | PL_curpad = AvARRAY(PL_comppad); | |
198 | ||
199 | if (! (flags & padnew_CLONE)) { | |
200 | PL_comppad_name_fill = 0; | |
201 | PL_min_intro_pending = 0; | |
202 | PL_padix = 0; | |
203 | } | |
204 | ||
205 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
206 | "Pad 0x%"UVxf"[0x%"UVxf"] new: padlist=0x%"UVxf | |
207 | " name=0x%"UVxf" flags=0x%"UVxf"\n", | |
208 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(padlist), | |
209 | PTR2UV(padname), (UV)flags | |
210 | ) | |
211 | ); | |
212 | ||
213 | return (PADLIST*)padlist; | |
214 | } | |
215 | ||
216 | /* | |
217 | =for apidoc pad_undef | |
218 | ||
219 | Free the padlist associated with a CV. | |
220 | If parts of it happen to be current, we null the relevant | |
221 | PL_*pad* global vars so that we don't have any dangling references left. | |
222 | We also repoint the CvOUTSIDE of any about-to-be-orphaned | |
d7afa7f5 JH |
223 | inner subs to the outer of this cv. |
224 | ||
225 | (This function should really be called pad_free, but the name was already | |
226 | taken) | |
9755d405 JH |
227 | |
228 | =cut | |
229 | */ | |
230 | ||
231 | void | |
d7afa7f5 | 232 | Perl_pad_undef(pTHX_ CV* cv) |
9755d405 JH |
233 | { |
234 | I32 ix; | |
e4a519ba | 235 | const PADLIST * const padlist = CvPADLIST(cv); |
9755d405 JH |
236 | |
237 | if (!padlist) | |
238 | return; | |
546fbbb9 | 239 | if (SvIS_FREED(padlist)) /* may be during global destruction */ |
9755d405 JH |
240 | return; |
241 | ||
242 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
243 | "Pad undef: padlist=0x%"UVxf"\n" , PTR2UV(padlist)) | |
244 | ); | |
245 | ||
d7afa7f5 JH |
246 | /* detach any '&' anon children in the pad; if afterwards they |
247 | * are still live, fix up their CvOUTSIDEs to point to our outside, | |
248 | * bypassing us. */ | |
249 | /* XXX DAPM for efficiency, we should only do this if we know we have | |
250 | * children, or integrate this loop with general cleanup */ | |
9755d405 | 251 | |
d7afa7f5 | 252 | if (!PL_dirty) { /* don't bother during global destruction */ |
0188be2e | 253 | CV * const outercv = CvOUTSIDE(cv); |
c05e0e2f | 254 | const U32 seq = CvOUTSIDE_SEQ(cv); |
0188be2e AL |
255 | AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; |
256 | SV ** const namepad = AvARRAY(comppad_name); | |
257 | AV * const comppad = (AV*)AvARRAY(padlist)[1]; | |
258 | SV ** const curpad = AvARRAY(comppad); | |
9755d405 | 259 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
547d29e4 | 260 | SV * const namesv = namepad[ix]; |
9755d405 | 261 | if (namesv && namesv != &PL_sv_undef |
5e7e76a3 | 262 | && *SvPVX_const(namesv) == '&') |
9755d405 | 263 | { |
1f49be52 | 264 | CV * const innercv = (CV*)curpad[ix]; |
e503e849 NC |
265 | U32 inner_rc = SvREFCNT(innercv); |
266 | assert(inner_rc); | |
0e2d6244 | 267 | namepad[ix] = NULL; |
d7afa7f5 | 268 | SvREFCNT_dec(namesv); |
1896a75e NC |
269 | |
270 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ | |
0e2d6244 | 271 | curpad[ix] = NULL; |
1896a75e | 272 | SvREFCNT_dec(innercv); |
e503e849 | 273 | inner_rc--; |
1896a75e | 274 | } |
be2d5e07 AL |
275 | |
276 | /* in use, not just a prototype */ | |
277 | if (inner_rc && (CvOUTSIDE(innercv) == cv)) { | |
d7afa7f5 | 278 | assert(CvWEAKOUTSIDE(innercv)); |
d211ebfa JH |
279 | /* don't relink to grandfather if he's being freed */ |
280 | if (outercv && SvREFCNT(outercv)) { | |
281 | CvWEAKOUTSIDE_off(innercv); | |
282 | CvOUTSIDE(innercv) = outercv; | |
283 | CvOUTSIDE_SEQ(innercv) = seq; | |
be2d5e07 | 284 | SvREFCNT_inc_simple_void_NN(outercv); |
d211ebfa JH |
285 | } |
286 | else { | |
287 | CvOUTSIDE(innercv) = Nullcv; | |
288 | } | |
9755d405 JH |
289 | } |
290 | } | |
291 | } | |
292 | } | |
d7afa7f5 | 293 | |
9755d405 JH |
294 | ix = AvFILLp(padlist); |
295 | while (ix >= 0) { | |
be2d5e07 AL |
296 | const SV* const sv = AvARRAY(padlist)[ix--]; |
297 | if (sv) { | |
298 | if (sv == (SV*)PL_comppad_name) | |
299 | PL_comppad_name = NULL; | |
300 | else if (sv == (SV*)PL_comppad) { | |
301 | PL_comppad = NULL; | |
302 | PL_curpad = NULL; | |
303 | } | |
9755d405 JH |
304 | } |
305 | SvREFCNT_dec(sv); | |
306 | } | |
307 | SvREFCNT_dec((SV*)CvPADLIST(cv)); | |
0e2d6244 | 308 | CvPADLIST(cv) = NULL; |
9755d405 JH |
309 | } |
310 | ||
311 | ||
312 | ||
313 | ||
314 | /* | |
315 | =for apidoc pad_add_name | |
316 | ||
317 | Create a new name in the current pad at the specified offset. | |
318 | If C<typestash> is valid, the name is for a typed lexical; set the | |
319 | name's stash to that value. | |
320 | If C<ourstash> is valid, it's an our lexical, set the name's | |
e70aec60 | 321 | SvOURSTASH to that value |
9755d405 JH |
322 | |
323 | Also, if the name is @.. or %.., create a new array or hash for that slot | |
324 | ||
325 | If fake, it means we're cloning an existing entry | |
326 | ||
327 | =cut | |
328 | */ | |
329 | ||
330 | /* | |
331 | * XXX DAPM this doesn't seem the right place to create a new array/hash. | |
332 | * Whatever we do, we should be consistent - create scalars too, and | |
333 | * create even if fake. Really need to integrate better the whole entry | |
334 | * creation business - when + where does the name and value get created? | |
335 | */ | |
336 | ||
337 | PADOFFSET | |
338 | Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) | |
339 | { | |
547d29e4 | 340 | const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
133cdda0 | 341 | SV* const namesv = newSV(0); |
9755d405 | 342 | |
d7afa7f5 JH |
343 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
344 | ||
9755d405 JH |
345 | |
346 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
d7afa7f5 JH |
347 | "Pad addname: %ld \"%s\"%s\n", |
348 | (long)offset, name, (fake ? " FAKE" : "") | |
9755d405 JH |
349 | ) |
350 | ); | |
351 | ||
352 | sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); | |
353 | sv_setpv(namesv, name); | |
354 | ||
355 | if (typestash) { | |
62d59642 | 356 | SvPAD_TYPED_on(namesv); |
be2d5e07 | 357 | SvSTASH_set(namesv, (HV*)SvREFCNT_inc_simple_NN((SV*)typestash)); |
9755d405 JH |
358 | } |
359 | if (ourstash) { | |
62d59642 | 360 | SvPAD_OUR_on(namesv); |
e70aec60 NC |
361 | (HV*)SvREFCNT_inc_simple_NN((SV*) ourstash); |
362 | SvOURSTASH_set(namesv, ourstash); | |
9755d405 JH |
363 | } |
364 | ||
365 | av_store(PL_comppad_name, offset, namesv); | |
9755d405 JH |
366 | if (fake) |
367 | SvFAKE_on(namesv); | |
368 | else { | |
d7afa7f5 | 369 | /* not yet introduced */ |
aa38d90e NC |
370 | COP_SEQ_RANGE_LOW_set(namesv, PAD_MAX); /* min */ |
371 | COP_SEQ_RANGE_HIGH_set(namesv, 0); /* max */ | |
d7afa7f5 | 372 | |
9755d405 JH |
373 | if (!PL_min_intro_pending) |
374 | PL_min_intro_pending = offset; | |
375 | PL_max_intro_pending = offset; | |
d7afa7f5 JH |
376 | /* XXX DAPM since slot has been allocated, replace |
377 | * av_store with PL_curpad[offset] ? */ | |
9755d405 JH |
378 | if (*name == '@') |
379 | av_store(PL_comppad, offset, (SV*)newAV()); | |
380 | else if (*name == '%') | |
381 | av_store(PL_comppad, offset, (SV*)newHV()); | |
382 | SvPADMY_on(PL_curpad[offset]); | |
383 | } | |
384 | ||
385 | return offset; | |
386 | } | |
387 | ||
388 | ||
389 | ||
390 | ||
391 | /* | |
392 | =for apidoc pad_alloc | |
393 | ||
394 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto | |
395 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards | |
de7b736d | 396 | for a slot which has no name and no active value. |
9755d405 JH |
397 | |
398 | =cut | |
399 | */ | |
400 | ||
401 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), | |
402 | * or at least rationalise ??? */ | |
5336d442 NC |
403 | /* And flag whether the incoming name is UTF8 or 8 bit? |
404 | Could do this either with the +ve/-ve hack of the HV code, or expanding | |
405 | the flag bits. Either way, this makes proper Unicode safe pad support. | |
406 | Also could change the sv structure to make the NV a union with 2 U32s, | |
407 | so that SvCUR() could stop being overloaded in pad SVs. | |
408 | NWC | |
409 | */ | |
9755d405 JH |
410 | |
411 | PADOFFSET | |
412 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) | |
413 | { | |
414 | SV *sv; | |
415 | I32 retval; | |
416 | ||
8916b559 | 417 | PERL_UNUSED_ARG(optype); |
d7afa7f5 JH |
418 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
419 | ||
9755d405 JH |
420 | if (AvARRAY(PL_comppad) != PL_curpad) |
421 | Perl_croak(aTHX_ "panic: pad_alloc"); | |
422 | if (PL_pad_reset_pending) | |
423 | pad_reset(); | |
424 | if (tmptype & SVs_PADMY) { | |
425 | do { | |
426 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); | |
427 | } while (SvPADBUSY(sv)); /* need a fresh one */ | |
428 | retval = AvFILLp(PL_comppad); | |
429 | } | |
430 | else { | |
78fd745e | 431 | SV * const * const names = AvARRAY(PL_comppad_name); |
c05e0e2f | 432 | const SSize_t names_fill = AvFILLp(PL_comppad_name); |
9755d405 JH |
433 | for (;;) { |
434 | /* | |
435 | * "foreach" index vars temporarily become aliases to non-"my" | |
436 | * values. Thus we must skip, not just pad values that are | |
437 | * marked as current pad values, but also those with names. | |
438 | */ | |
439 | /* HVDS why copy to sv here? we don't seem to use it */ | |
440 | if (++PL_padix <= names_fill && | |
441 | (sv = names[PL_padix]) && sv != &PL_sv_undef) | |
442 | continue; | |
443 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); | |
444 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && | |
445 | !IS_PADGV(sv) && !IS_PADCONST(sv)) | |
446 | break; | |
447 | } | |
448 | retval = PL_padix; | |
449 | } | |
450 | SvFLAGS(sv) |= tmptype; | |
451 | PL_curpad = AvARRAY(PL_comppad); | |
452 | ||
453 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
454 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", | |
455 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, | |
456 | PL_op_name[optype])); | |
457 | return (PADOFFSET)retval; | |
458 | } | |
459 | ||
460 | /* | |
461 | =for apidoc pad_add_anon | |
462 | ||
463 | Add an anon code entry to the current compiling pad | |
464 | ||
465 | =cut | |
466 | */ | |
467 | ||
468 | PADOFFSET | |
469 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) | |
470 | { | |
471 | PADOFFSET ix; | |
133cdda0 | 472 | SV* const name = newSV(0); |
9755d405 JH |
473 | sv_upgrade(name, SVt_PVNV); |
474 | sv_setpvn(name, "&", 1); | |
aa38d90e NC |
475 | /* Are these two actually ever read? */ |
476 | COP_SEQ_RANGE_HIGH_set(name, ~0); | |
477 | COP_SEQ_RANGE_LOW_set(name, 1); | |
9755d405 JH |
478 | ix = pad_alloc(op_type, SVs_PADMY); |
479 | av_store(PL_comppad_name, ix, name); | |
d7afa7f5 | 480 | /* XXX DAPM use PL_curpad[] ? */ |
9755d405 JH |
481 | av_store(PL_comppad, ix, sv); |
482 | SvPADMY_on(sv); | |
d7afa7f5 JH |
483 | |
484 | /* to avoid ref loops, we never have parent + child referencing each | |
485 | * other simultaneously */ | |
486 | if (CvOUTSIDE((CV*)sv)) { | |
487 | assert(!CvWEAKOUTSIDE((CV*)sv)); | |
488 | CvWEAKOUTSIDE_on((CV*)sv); | |
489 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); | |
490 | } | |
9755d405 JH |
491 | return ix; |
492 | } | |
493 | ||
494 | ||
495 | ||
496 | /* | |
497 | =for apidoc pad_check_dup | |
498 | ||
499 | Check for duplicate declarations: report any of: | |
500 | * a my in the current scope with the same name; | |
501 | * an our (anywhere in the pad) with the same name and the same stash | |
502 | as C<ourstash> | |
503 | C<is_our> indicates that the name to check is an 'our' declaration | |
504 | ||
505 | =cut | |
506 | */ | |
507 | ||
508 | /* XXX DAPM integrate this into pad_add_name ??? */ | |
509 | ||
510 | void | |
511 | Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) | |
512 | { | |
0188be2e | 513 | SV **svp; |
9755d405 JH |
514 | PADOFFSET top, off; |
515 | ||
d7afa7f5 | 516 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
f5e9f069 | 517 | if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC)) |
9755d405 JH |
518 | return; /* nothing to check */ |
519 | ||
520 | svp = AvARRAY(PL_comppad_name); | |
521 | top = AvFILLp(PL_comppad_name); | |
522 | /* check the current scope */ | |
523 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same | |
524 | * type ? */ | |
525 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { | |
0188be2e AL |
526 | SV * const sv = svp[off]; |
527 | if (sv | |
9755d405 | 528 | && sv != &PL_sv_undef |
d7afa7f5 | 529 | && !SvFAKE(sv) |
aa38d90e | 530 | && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0) |
9755d405 JH |
531 | && (!is_our |
532 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) | |
5e7e76a3 | 533 | && strEQ(name, SvPVX_const(sv))) |
9755d405 JH |
534 | { |
535 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
536 | "\"%s\" variable %s masks earlier declaration in same %s", | |
537 | (is_our ? "our" : "my"), | |
538 | name, | |
aa38d90e | 539 | (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX ? "scope" : "statement")); |
9755d405 JH |
540 | --off; |
541 | break; | |
542 | } | |
543 | } | |
544 | /* check the rest of the pad */ | |
545 | if (is_our) { | |
546 | do { | |
0188be2e AL |
547 | SV * const sv = svp[off]; |
548 | if (sv | |
9755d405 | 549 | && sv != &PL_sv_undef |
d7afa7f5 | 550 | && !SvFAKE(sv) |
aa38d90e | 551 | && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0) |
e70aec60 | 552 | && SvOURSTASH(sv) == ourstash |
5e7e76a3 | 553 | && strEQ(name, SvPVX_const(sv))) |
9755d405 JH |
554 | { |
555 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
556 | "\"our\" variable %s redeclared", name); | |
557 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
558 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
559 | break; | |
560 | } | |
561 | } while ( off-- > 0 ); | |
562 | } | |
563 | } | |
564 | ||
565 | ||
566 | ||
567 | /* | |
568 | =for apidoc pad_findmy | |
569 | ||
570 | Given a lexical name, try to find its offset, first in the current pad, | |
571 | or failing that, in the pads of any lexically enclosing subs (including | |
572 | the complications introduced by eval). If the name is found in an outer pad, | |
573 | then a fake entry is added to the current pad. | |
574 | Returns the offset in the current pad, or NOT_IN_PAD on failure. | |
575 | ||
576 | =cut | |
577 | */ | |
578 | ||
579 | PADOFFSET | |
580 | Perl_pad_findmy(pTHX_ char *name) | |
581 | { | |
582 | I32 off; | |
d7afa7f5 | 583 | I32 fake_off = 0; |
606812b8 | 584 | I32 our_off = 0; |
9755d405 JH |
585 | SV *sv; |
586 | SV **svp = AvARRAY(PL_comppad_name); | |
587 | U32 seq = PL_cop_seqmax; | |
9755d405 | 588 | |
d7afa7f5 | 589 | ASSERT_CURPAD_ACTIVE("pad_findmy"); |
9755d405 JH |
590 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad findmy: \"%s\"\n", name)); |
591 | ||
592 | #ifdef USE_5005THREADS | |
593 | /* | |
594 | * Special case to get lexical (and hence per-thread) @_. | |
595 | * XXX I need to find out how to tell at parse-time whether use | |
596 | * of @_ should refer to a lexical (from a sub) or defgv (global | |
597 | * scope and maybe weird sub-ish things like formats). See | |
598 | * startsub in perly.y. It's possible that @_ could be lexical | |
599 | * (at least from subs) even in non-threaded perl. | |
600 | */ | |
601 | if (strEQ(name, "@_")) | |
602 | return 0; /* success. (NOT_IN_PAD indicates failure) */ | |
603 | #endif /* USE_5005THREADS */ | |
604 | ||
605 | /* The one we're looking for is probably just before comppad_name_fill. */ | |
606 | for (off = AvFILLp(PL_comppad_name); off > 0; off--) { | |
d7afa7f5 | 607 | sv = svp[off]; |
5e7e76a3 | 608 | if (!sv || sv == &PL_sv_undef || !strEQ(SvPVX_const(sv), name)) |
d7afa7f5 JH |
609 | continue; |
610 | if (SvFAKE(sv)) { | |
611 | /* we'll use this later if we don't find a real entry */ | |
612 | fake_off = off; | |
613 | continue; | |
614 | } | |
615 | else { | |
aa38d90e NC |
616 | if ( seq > COP_SEQ_RANGE_LOW(sv) /* min */ |
617 | && seq <= COP_SEQ_RANGE_HIGH(sv)) /* max */ | |
d7afa7f5 | 618 | return off; |
62d59642 | 619 | else if (SvPAD_OUR(sv) |
aa38d90e | 620 | && COP_SEQ_RANGE_LOW(sv) == PAD_MAX) /* min */ |
606812b8 DM |
621 | { |
622 | /* look for an our that's being introduced; this allows | |
623 | * our $foo = 0 unless defined $foo; | |
624 | * to not give a warning. (Yes, this is a hack) */ | |
625 | our_off = off; | |
626 | } | |
9755d405 JH |
627 | } |
628 | } | |
d7afa7f5 JH |
629 | if (fake_off) |
630 | return fake_off; | |
9755d405 JH |
631 | |
632 | /* See if it's in a nested scope */ | |
d7afa7f5 | 633 | off = pad_findlex(name, 0, PL_compcv); |
606812b8 DM |
634 | if (off) /* pad_findlex returns 0 for failure...*/ |
635 | return off; | |
636 | if (our_off) | |
637 | return our_off; | |
638 | return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */ | |
9755d405 | 639 | |
9755d405 JH |
640 | } |
641 | ||
642 | ||
643 | ||
644 | /* | |
645 | =for apidoc pad_findlex | |
646 | ||
647 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
d7afa7f5 JH |
648 | in the inner pads if it's found in an outer one. innercv is the CV *inside* |
649 | the chain of outer CVs to be searched. If newoff is non-null, this is a | |
650 | run-time cloning: don't add fake entries, just find the lexical and add a | |
651 | ref to it at newoff in the current pad. | |
9755d405 JH |
652 | |
653 | =cut | |
654 | */ | |
655 | ||
9755d405 | 656 | STATIC PADOFFSET |
c05e0e2f | 657 | S_pad_findlex(pTHX_ const char *name, PADOFFSET newoff, const CV* innercv) |
9755d405 JH |
658 | { |
659 | CV *cv; | |
d7afa7f5 | 660 | I32 off = 0; |
9755d405 | 661 | SV *sv; |
d7afa7f5 JH |
662 | CV* startcv; |
663 | U32 seq; | |
664 | I32 depth; | |
665 | AV *oldpad; | |
666 | SV *oldsv; | |
667 | AV *curlist; | |
668 | ||
669 | ASSERT_CURPAD_ACTIVE("pad_findlex"); | |
9755d405 | 670 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
d7afa7f5 JH |
671 | "Pad findlex: \"%s\" off=%ld startcv=0x%"UVxf"\n", |
672 | name, (long)newoff, PTR2UV(innercv)) | |
9755d405 JH |
673 | ); |
674 | ||
d7afa7f5 JH |
675 | seq = CvOUTSIDE_SEQ(innercv); |
676 | startcv = CvOUTSIDE(innercv); | |
677 | ||
678 | for (cv = startcv; cv; seq = CvOUTSIDE_SEQ(cv), cv = CvOUTSIDE(cv)) { | |
679 | SV **svp; | |
9755d405 | 680 | AV *curname; |
d7afa7f5 | 681 | I32 fake_off = 0; |
9755d405 JH |
682 | |
683 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
d7afa7f5 JH |
684 | " searching: cv=0x%"UVxf" seq=%d\n", |
685 | PTR2UV(cv), (int) seq ) | |
9755d405 JH |
686 | ); |
687 | ||
d7afa7f5 JH |
688 | curlist = CvPADLIST(cv); |
689 | if (!curlist) | |
690 | continue; /* an undef CV */ | |
691 | svp = av_fetch(curlist, 0, FALSE); | |
9755d405 JH |
692 | if (!svp || *svp == &PL_sv_undef) |
693 | continue; | |
694 | curname = (AV*)*svp; | |
695 | svp = AvARRAY(curname); | |
d7afa7f5 JH |
696 | |
697 | depth = CvDEPTH(cv); | |
9755d405 | 698 | for (off = AvFILLp(curname); off > 0; off--) { |
d7afa7f5 | 699 | sv = svp[off]; |
5e7e76a3 | 700 | if (!sv || sv == &PL_sv_undef || !strEQ(SvPVX_const(sv), name)) |
9755d405 | 701 | continue; |
d7afa7f5 JH |
702 | if (SvFAKE(sv)) { |
703 | /* we'll use this later if we don't find a real entry */ | |
704 | fake_off = off; | |
705 | continue; | |
706 | } | |
707 | else { | |
aa38d90e NC |
708 | if ( seq > COP_SEQ_RANGE_LOW(sv) /* min */ |
709 | && seq <= COP_SEQ_RANGE_HIGH(sv) /* max */ | |
d7afa7f5 JH |
710 | && !(newoff && !depth) /* ignore inactive when cloning */ |
711 | ) | |
712 | goto found; | |
9755d405 | 713 | } |
d7afa7f5 | 714 | } |
9755d405 | 715 | |
d7afa7f5 JH |
716 | /* no real entry - but did we find a fake one? */ |
717 | if (fake_off) { | |
718 | if (newoff && !depth) | |
719 | return 0; /* don't clone from inactive stack frame */ | |
720 | off = fake_off; | |
721 | sv = svp[off]; | |
722 | goto found; | |
723 | } | |
724 | } | |
725 | return 0; | |
9755d405 | 726 | |
d7afa7f5 | 727 | found: |
9755d405 | 728 | |
d7afa7f5 JH |
729 | if (!depth) |
730 | depth = 1; | |
731 | ||
732 | oldpad = (AV*)AvARRAY(curlist)[depth]; | |
733 | oldsv = *av_fetch(oldpad, off, TRUE); | |
9755d405 | 734 | |
d7afa7f5 JH |
735 | #ifdef DEBUGGING |
736 | if (SvFAKE(sv)) | |
737 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
738 | " matched: offset %ld" | |
739 | " FAKE, sv=0x%"UVxf"\n", | |
740 | (long)off, | |
741 | PTR2UV(oldsv) | |
742 | ) | |
743 | ); | |
744 | else | |
745 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
746 | " matched: offset %ld" | |
747 | " (%lu,%lu), sv=0x%"UVxf"\n", | |
748 | (long)off, | |
aa38d90e NC |
749 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
750 | (unsigned long)COP_SEQ_RANGE_HIGH(sv), | |
d7afa7f5 JH |
751 | PTR2UV(oldsv) |
752 | ) | |
753 | ); | |
754 | #endif | |
755 | ||
756 | if (!newoff) { /* Not a mere clone operation. */ | |
757 | newoff = pad_add_name( | |
758 | SvPVX(sv), | |
759 | (SvFLAGS(sv) & SVpad_TYPED) ? SvSTASH(sv) : Nullhv, | |
760 | (SvFLAGS(sv) & SVpad_OUR) ? GvSTASH(sv) : Nullhv, | |
761 | 1 /* fake */ | |
762 | ); | |
763 | ||
764 | if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) { | |
765 | /* "It's closures all the way down." */ | |
766 | CvCLONE_on(PL_compcv); | |
767 | if (cv == startcv) { | |
768 | if (CvANON(PL_compcv)) | |
0e2d6244 | 769 | oldsv = NULL; /* no need to keep ref */ |
d7afa7f5 JH |
770 | } |
771 | else { | |
772 | CV *bcv; | |
773 | for (bcv = startcv; | |
774 | bcv && bcv != cv && !CvCLONE(bcv); | |
775 | bcv = CvOUTSIDE(bcv)) | |
776 | { | |
777 | if (CvANON(bcv)) { | |
778 | /* install the missing pad entry in intervening | |
779 | * nested subs and mark them cloneable. */ | |
780 | AV *ocomppad_name = PL_comppad_name; | |
781 | PAD *ocomppad = PL_comppad; | |
782 | AV *padlist = CvPADLIST(bcv); | |
783 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; | |
784 | PL_comppad = (AV*)AvARRAY(padlist)[1]; | |
785 | PL_curpad = AvARRAY(PL_comppad); | |
786 | pad_add_name( | |
787 | SvPVX(sv), | |
788 | (SvFLAGS(sv) & SVpad_TYPED) | |
0e2d6244 | 789 | ? SvSTASH(sv) : NULL, |
d7afa7f5 | 790 | (SvFLAGS(sv) & SVpad_OUR) |
0e2d6244 | 791 | ? GvSTASH(sv) : NULL, |
d7afa7f5 JH |
792 | 1 /* fake */ |
793 | ); | |
794 | ||
795 | PL_comppad_name = ocomppad_name; | |
796 | PL_comppad = ocomppad; | |
797 | PL_curpad = ocomppad ? | |
798 | AvARRAY(ocomppad) : Null(SV **); | |
799 | CvCLONE_on(bcv); | |
9755d405 JH |
800 | } |
801 | else { | |
d7afa7f5 JH |
802 | if (ckWARN(WARN_CLOSURE) |
803 | && !CvUNIQUE(bcv) && !CvUNIQUE(cv)) | |
9755d405 | 804 | { |
d7afa7f5 JH |
805 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
806 | "Variable \"%s\" may be unavailable", | |
807 | name); | |
9755d405 | 808 | } |
d7afa7f5 | 809 | break; |
9755d405 JH |
810 | } |
811 | } | |
812 | } | |
9755d405 | 813 | } |
d7afa7f5 JH |
814 | else if (!CvUNIQUE(PL_compcv)) { |
815 | if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv) | |
62d59642 | 816 | && !(SvPAD_OUR(sv))) |
d7afa7f5 JH |
817 | { |
818 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
819 | "Variable \"%s\" will not stay shared", name); | |
9755d405 | 820 | } |
9755d405 JH |
821 | } |
822 | } | |
d7afa7f5 JH |
823 | av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv)); |
824 | ASSERT_CURPAD_ACTIVE("pad_findlex 2"); | |
825 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
826 | "Pad findlex: set offset %ld to sv 0x%"UVxf"\n", | |
827 | (long)newoff, PTR2UV(oldsv) | |
828 | ) | |
829 | ); | |
830 | return newoff; | |
9755d405 JH |
831 | } |
832 | ||
833 | ||
834 | /* | |
835 | =for apidoc pad_sv | |
836 | ||
837 | Get the value at offset po in the current pad. | |
838 | Use macro PAD_SV instead of calling this function directly. | |
839 | ||
840 | =cut | |
841 | */ | |
842 | ||
843 | ||
844 | SV * | |
845 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
846 | { | |
d7afa7f5 | 847 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
9755d405 JH |
848 | |
849 | #ifndef USE_5005THREADS | |
850 | if (!po) | |
851 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
852 | #endif | |
853 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
854 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
d7afa7f5 | 855 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
9755d405 JH |
856 | ); |
857 | return PL_curpad[po]; | |
858 | } | |
859 | ||
860 | ||
861 | /* | |
862 | =for apidoc pad_setsv | |
863 | ||
864 | Set the entry at offset po in the current pad to sv. | |
865 | Use the macro PAD_SETSV() rather than calling this function directly. | |
866 | ||
867 | =cut | |
868 | */ | |
869 | ||
870 | #ifdef DEBUGGING | |
871 | void | |
872 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
873 | { | |
d7afa7f5 | 874 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
9755d405 JH |
875 | |
876 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
877 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
d7afa7f5 | 878 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
9755d405 JH |
879 | ); |
880 | PL_curpad[po] = sv; | |
881 | } | |
882 | #endif | |
883 | ||
884 | ||
885 | ||
886 | /* | |
887 | =for apidoc pad_block_start | |
888 | ||
889 | Update the pad compilation state variables on entry to a new block | |
890 | ||
891 | =cut | |
892 | */ | |
893 | ||
894 | /* XXX DAPM perhaps: | |
895 | * - integrate this in general state-saving routine ??? | |
896 | * - combine with the state-saving going on in pad_new ??? | |
897 | * - introduce a new SAVE type that does all this in one go ? | |
898 | */ | |
899 | ||
900 | void | |
901 | Perl_pad_block_start(pTHX_ int full) | |
902 | { | |
d7afa7f5 | 903 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
9755d405 JH |
904 | SAVEI32(PL_comppad_name_floor); |
905 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
906 | if (full) | |
907 | PL_comppad_name_fill = PL_comppad_name_floor; | |
908 | if (PL_comppad_name_floor < 0) | |
909 | PL_comppad_name_floor = 0; | |
910 | SAVEI32(PL_min_intro_pending); | |
911 | SAVEI32(PL_max_intro_pending); | |
912 | PL_min_intro_pending = 0; | |
913 | SAVEI32(PL_comppad_name_fill); | |
914 | SAVEI32(PL_padix_floor); | |
915 | PL_padix_floor = PL_padix; | |
916 | PL_pad_reset_pending = FALSE; | |
917 | } | |
918 | ||
919 | ||
920 | /* | |
921 | =for apidoc intro_my | |
922 | ||
923 | "Introduce" my variables to visible status. | |
924 | ||
925 | =cut | |
926 | */ | |
927 | ||
928 | U32 | |
929 | Perl_intro_my(pTHX) | |
930 | { | |
931 | SV **svp; | |
9755d405 JH |
932 | I32 i; |
933 | ||
d7afa7f5 | 934 | ASSERT_CURPAD_ACTIVE("intro_my"); |
9755d405 JH |
935 | if (! PL_min_intro_pending) |
936 | return PL_cop_seqmax; | |
937 | ||
938 | svp = AvARRAY(PL_comppad_name); | |
939 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
0188be2e AL |
940 | SV * const sv = svp[i]; |
941 | ||
aa38d90e NC |
942 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !COP_SEQ_RANGE_HIGH(sv)) { |
943 | COP_SEQ_RANGE_HIGH_set(sv, PAD_MAX); /* Don't know scope end yet. */ | |
944 | COP_SEQ_RANGE_LOW_set(sv, PL_cop_seqmax); | |
9755d405 JH |
945 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
946 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", | |
5e7e76a3 | 947 | (long)i, SvPVX_const(sv), |
aa38d90e NC |
948 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
949 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
9755d405 JH |
950 | ); |
951 | } | |
952 | } | |
953 | PL_min_intro_pending = 0; | |
954 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
955 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
956 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
957 | ||
958 | return PL_cop_seqmax++; | |
959 | } | |
960 | ||
961 | /* | |
962 | =for apidoc pad_leavemy | |
963 | ||
964 | Cleanup at end of scope during compilation: set the max seq number for | |
965 | lexicals in this scope and warn of any lexicals that never got introduced. | |
966 | ||
967 | =cut | |
968 | */ | |
969 | ||
970 | void | |
971 | Perl_pad_leavemy(pTHX) | |
972 | { | |
973 | I32 off; | |
78fd745e | 974 | SV * const * const svp = AvARRAY(PL_comppad_name); |
9755d405 JH |
975 | |
976 | PL_pad_reset_pending = FALSE; | |
977 | ||
d7afa7f5 | 978 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
9755d405 JH |
979 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
980 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
0188be2e AL |
981 | const SV * const sv = svp[off]; |
982 | if (sv && sv != &PL_sv_undef | |
d7afa7f5 | 983 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) |
9755d405 | 984 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
f2139bd3 JH |
985 | "%"SVf" never introduced", |
986 | (void*)sv); | |
9755d405 JH |
987 | } |
988 | } | |
989 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
990 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
0188be2e | 991 | const SV * const sv = svp[off]; |
aa38d90e NC |
992 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && COP_SEQ_RANGE_HIGH(sv) == PAD_MAX) { |
993 | COP_SEQ_RANGE_HIGH_set(sv, PL_cop_seqmax); | |
9755d405 JH |
994 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
995 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", | |
5e7e76a3 | 996 | (long)off, SvPVX_const(sv), |
aa38d90e NC |
997 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
998 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
9755d405 JH |
999 | ); |
1000 | } | |
1001 | } | |
1002 | PL_cop_seqmax++; | |
1003 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1004 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
1005 | } | |
1006 | ||
1007 | ||
1008 | /* | |
1009 | =for apidoc pad_swipe | |
1010 | ||
1011 | Abandon the tmp in the current pad at offset po and replace with a | |
1012 | new one. | |
1013 | ||
1014 | =cut | |
1015 | */ | |
1016 | ||
1017 | void | |
1018 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
1019 | { | |
d7afa7f5 | 1020 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
9755d405 JH |
1021 | if (!PL_curpad) |
1022 | return; | |
1023 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1024 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
1025 | if (!po) | |
1026 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
1027 | ||
1028 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1029 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
1030 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
1031 | ||
1032 | if (PL_curpad[po]) | |
1033 | SvPADTMP_off(PL_curpad[po]); | |
1034 | if (refadjust) | |
1035 | SvREFCNT_dec(PL_curpad[po]); | |
1036 | ||
8aea1737 NC |
1037 | |
1038 | /* if pad tmps aren't shared between ops, then there's no need to | |
1039 | * create a new tmp when an existing op is freed */ | |
1040 | #ifdef USE_BROKEN_PAD_RESET | |
133cdda0 | 1041 | PL_curpad[po] = newSV(0); |
9755d405 | 1042 | SvPADTMP_on(PL_curpad[po]); |
8aea1737 NC |
1043 | #else |
1044 | PL_curpad[po] = &PL_sv_undef; | |
1045 | #endif | |
9755d405 JH |
1046 | if ((I32)po < PL_padix) |
1047 | PL_padix = po - 1; | |
1048 | } | |
1049 | ||
1050 | ||
1051 | /* | |
1052 | =for apidoc pad_reset | |
1053 | ||
1054 | Mark all the current temporaries for reuse | |
1055 | ||
1056 | =cut | |
1057 | */ | |
1058 | ||
1059 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
1060 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
1061 | * on the stack by OPs that use them, there are several ways to get an alias | |
1062 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
1063 | * We avoid doing this until we can think of a Better Way. | |
1064 | * GSAR 97-10-29 */ | |
1065 | void | |
1066 | Perl_pad_reset(pTHX) | |
1067 | { | |
1068 | #ifdef USE_BROKEN_PAD_RESET | |
9755d405 JH |
1069 | if (AvARRAY(PL_comppad) != PL_curpad) |
1070 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
1071 | ||
1072 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1073 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
1074 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1075 | (long)PL_padix, (long)PL_padix_floor | |
1076 | ) | |
1077 | ); | |
1078 | ||
1079 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
c05e0e2f | 1080 | register I32 po; |
9755d405 JH |
1081 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1082 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1083 | SvPADTMP_off(PL_curpad[po]); | |
1084 | } | |
1085 | PL_padix = PL_padix_floor; | |
1086 | } | |
1087 | #endif | |
1088 | PL_pad_reset_pending = FALSE; | |
1089 | } | |
1090 | ||
1091 | ||
1092 | /* | |
1093 | =for apidoc pad_tidy | |
1094 | ||
1095 | Tidy up a pad after we've finished compiling it: | |
1096 | * remove most stuff from the pads of anonsub prototypes; | |
1097 | * give it a @_; | |
1098 | * mark tmps as such. | |
1099 | ||
1100 | =cut | |
1101 | */ | |
1102 | ||
1103 | /* XXX DAPM surely most of this stuff should be done properly | |
1104 | * at the right time beforehand, rather than going around afterwards | |
1105 | * cleaning up our mistakes ??? | |
1106 | */ | |
1107 | ||
1108 | void | |
1109 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1110 | { | |
9755d405 | 1111 | |
d7afa7f5 | 1112 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
9755d405 JH |
1113 | /* extend curpad to match namepad */ |
1114 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
0e2d6244 | 1115 | av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL); |
9755d405 JH |
1116 | |
1117 | if (type == padtidy_SUBCLONE) { | |
78fd745e | 1118 | SV * const * const namep = AvARRAY(PL_comppad_name); |
547d29e4 | 1119 | PADOFFSET ix; |
9755d405 JH |
1120 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1121 | SV *namesv; | |
1122 | ||
1123 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1124 | continue; | |
1125 | /* | |
1126 | * The only things that a clonable function needs in its | |
1127 | * pad are references to outer lexicals and anonymous subs. | |
1128 | * The rest are created anew during cloning. | |
1129 | */ | |
0e2d6244 | 1130 | if (!((namesv = namep[ix]) != NULL && |
9755d405 JH |
1131 | namesv != &PL_sv_undef && |
1132 | (SvFAKE(namesv) || | |
5e7e76a3 | 1133 | *SvPVX_const(namesv) == '&'))) |
9755d405 JH |
1134 | { |
1135 | SvREFCNT_dec(PL_curpad[ix]); | |
0e2d6244 | 1136 | PL_curpad[ix] = NULL; |
9755d405 JH |
1137 | } |
1138 | } | |
1139 | } | |
1140 | else if (type == padtidy_SUB) { | |
1141 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
0188be2e | 1142 | AV * const av = newAV(); /* Will be @_ */ |
9755d405 JH |
1143 | av_extend(av, 0); |
1144 | av_store(PL_comppad, 0, (SV*)av); | |
1145 | AvFLAGS(av) = AVf_REIFY; | |
1146 | } | |
1147 | ||
1148 | /* XXX DAPM rationalise these two similar branches */ | |
1149 | ||
1150 | if (type == padtidy_SUB) { | |
547d29e4 | 1151 | PADOFFSET ix; |
9755d405 JH |
1152 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1153 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1154 | continue; | |
1155 | if (!SvPADMY(PL_curpad[ix])) | |
1156 | SvPADTMP_on(PL_curpad[ix]); | |
1157 | } | |
1158 | } | |
1159 | else if (type == padtidy_FORMAT) { | |
547d29e4 | 1160 | PADOFFSET ix; |
9755d405 JH |
1161 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1162 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) | |
1163 | SvPADTMP_on(PL_curpad[ix]); | |
1164 | } | |
1165 | } | |
d7afa7f5 | 1166 | PL_curpad = AvARRAY(PL_comppad); |
9755d405 JH |
1167 | } |
1168 | ||
1169 | ||
1170 | /* | |
1171 | =for apidoc pad_free | |
1172 | ||
de7b736d | 1173 | Free the SV at offset po in the current pad. |
9755d405 JH |
1174 | |
1175 | =cut | |
1176 | */ | |
1177 | ||
1178 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1179 | void | |
1180 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1181 | { | |
d7afa7f5 | 1182 | ASSERT_CURPAD_LEGAL("pad_free"); |
9755d405 JH |
1183 | if (!PL_curpad) |
1184 | return; | |
1185 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1186 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1187 | if (!po) | |
1188 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1189 | ||
1190 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1191 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1192 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1193 | ); | |
1194 | ||
1195 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1196 | SvPADTMP_off(PL_curpad[po]); | |
1197 | #ifdef USE_ITHREADS | |
1198 | /* SV could be a shared hash key (eg bugid #19022) */ | |
1199 | if (!SvFAKE(PL_curpad[po])) | |
1200 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ | |
1201 | #endif | |
1202 | ||
1203 | } | |
1204 | if ((I32)po < PL_padix) | |
1205 | PL_padix = po - 1; | |
1206 | } | |
1207 | ||
1208 | ||
1209 | ||
1210 | /* | |
1211 | =for apidoc do_dump_pad | |
1212 | ||
1213 | Dump the contents of a padlist | |
1214 | ||
1215 | =cut | |
1216 | */ | |
1217 | ||
1218 | void | |
1219 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1220 | { | |
c05e0e2f AL |
1221 | const AV *pad_name; |
1222 | const AV *pad; | |
9755d405 JH |
1223 | SV **pname; |
1224 | SV **ppad; | |
9755d405 JH |
1225 | I32 ix; |
1226 | ||
1227 | if (!padlist) { | |
1228 | return; | |
1229 | } | |
1230 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); | |
1231 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); | |
1232 | pname = AvARRAY(pad_name); | |
1233 | ppad = AvARRAY(pad); | |
1234 | Perl_dump_indent(aTHX_ level, file, | |
1235 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1236 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1237 | ); | |
1238 | ||
1239 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
c05e0e2f | 1240 | const SV *namesv = pname[ix]; |
9755d405 | 1241 | if (namesv && namesv == &PL_sv_undef) { |
0e2d6244 | 1242 | namesv = NULL; |
9755d405 JH |
1243 | } |
1244 | if (namesv) { | |
d7afa7f5 JH |
1245 | if (SvFAKE(namesv)) |
1246 | Perl_dump_indent(aTHX_ level+1, file, | |
a72b686c | 1247 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\"\n", |
d7afa7f5 JH |
1248 | (int) ix, |
1249 | PTR2UV(ppad[ix]), | |
1250 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
5e7e76a3 | 1251 | SvPVX_const(namesv) |
d7afa7f5 JH |
1252 | ); |
1253 | else | |
1254 | Perl_dump_indent(aTHX_ level+1, file, | |
a72b686c | 1255 | "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n", |
d7afa7f5 JH |
1256 | (int) ix, |
1257 | PTR2UV(ppad[ix]), | |
1258 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
aa38d90e NC |
1259 | (unsigned long)COP_SEQ_RANGE_LOW(namesv), |
1260 | (unsigned long)COP_SEQ_RANGE_HIGH(namesv), | |
5e7e76a3 | 1261 | SvPVX_const(namesv) |
d7afa7f5 | 1262 | ); |
9755d405 JH |
1263 | } |
1264 | else if (full) { | |
1265 | Perl_dump_indent(aTHX_ level+1, file, | |
1266 | "%2d. 0x%"UVxf"<%lu>\n", | |
1267 | (int) ix, | |
1268 | PTR2UV(ppad[ix]), | |
1269 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1270 | ); | |
1271 | } | |
1272 | } | |
1273 | } | |
1274 | ||
1275 | ||
1276 | ||
1277 | /* | |
1278 | =for apidoc cv_dump | |
1279 | ||
1280 | dump the contents of a CV | |
1281 | ||
1282 | =cut | |
1283 | */ | |
1284 | ||
1285 | #ifdef DEBUGGING | |
1286 | STATIC void | |
c05e0e2f | 1287 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
9755d405 | 1288 | { |
0188be2e AL |
1289 | const CV * const outside = CvOUTSIDE(cv); |
1290 | AV* const padlist = CvPADLIST(cv); | |
9755d405 JH |
1291 | |
1292 | PerlIO_printf(Perl_debug_log, | |
1293 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1294 | title, | |
1295 | PTR2UV(cv), | |
1296 | (CvANON(cv) ? "ANON" | |
1297 | : (cv == PL_main_cv) ? "MAIN" | |
1298 | : CvUNIQUE(cv) ? "UNIQUE" | |
1299 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1300 | PTR2UV(outside), | |
1301 | (!outside ? "null" | |
1302 | : CvANON(outside) ? "ANON" | |
1303 | : (outside == PL_main_cv) ? "MAIN" | |
1304 | : CvUNIQUE(outside) ? "UNIQUE" | |
1305 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1306 | ||
1307 | PerlIO_printf(Perl_debug_log, | |
1308 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1309 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1310 | } | |
1311 | #endif /* DEBUGGING */ | |
1312 | ||
1313 | ||
1314 | ||
1315 | ||
1316 | ||
1317 | /* | |
1318 | =for apidoc cv_clone | |
1319 | ||
1320 | Clone a CV: make a new CV which points to the same code etc, but which | |
1321 | has a newly-created pad built by copying the prototype pad and capturing | |
1322 | any outer lexicals. | |
1323 | ||
1324 | =cut | |
1325 | */ | |
1326 | ||
1327 | CV * | |
1328 | Perl_cv_clone(pTHX_ CV *proto) | |
1329 | { | |
1330 | CV *cv; | |
1331 | ||
1332 | LOCK_CRED_MUTEX; /* XXX create separate mutex */ | |
1333 | cv = cv_clone2(proto, CvOUTSIDE(proto)); | |
1334 | UNLOCK_CRED_MUTEX; /* XXX create separate mutex */ | |
1335 | return cv; | |
1336 | } | |
1337 | ||
1338 | ||
1339 | /* XXX DAPM separate out cv and paddish bits ??? | |
1340 | * ideally the CV-related stuff shouldn't be in pad.c - how about | |
1341 | * a cv.c? */ | |
1342 | ||
1343 | STATIC CV * | |
1344 | S_cv_clone2(pTHX_ CV *proto, CV *outside) | |
1345 | { | |
1346 | I32 ix; | |
0188be2e AL |
1347 | AV* const protopadlist = CvPADLIST(proto); |
1348 | const AV* const protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); | |
1349 | const AV* const protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); | |
1350 | SV** const pname = AvARRAY(protopad_name); | |
1351 | SV** const ppad = AvARRAY(protopad); | |
c05e0e2f AL |
1352 | const I32 fname = AvFILLp(protopad_name); |
1353 | const I32 fpad = AvFILLp(protopad); | |
9755d405 JH |
1354 | CV* cv; |
1355 | ||
1356 | assert(!CvUNIQUE(proto)); | |
1357 | ||
1358 | ENTER; | |
1359 | SAVESPTR(PL_compcv); | |
1360 | ||
133cdda0 | 1361 | cv = PL_compcv = (CV*)newSV(0); |
9755d405 | 1362 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
d7afa7f5 | 1363 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
9755d405 JH |
1364 | CvCLONED_on(cv); |
1365 | ||
1366 | #ifdef USE_5005THREADS | |
1367 | New(666, CvMUTEXP(cv), 1, perl_mutex); | |
1368 | MUTEX_INIT(CvMUTEXP(cv)); | |
1369 | CvOWNER(cv) = 0; | |
1370 | #endif /* USE_5005THREADS */ | |
1371 | #ifdef USE_ITHREADS | |
b8ad7764 NC |
1372 | CvFILE(cv) = CvISXSUB(proto) ? CvFILE(proto) |
1373 | : savepv(CvFILE(proto)); | |
9755d405 JH |
1374 | #else |
1375 | CvFILE(cv) = CvFILE(proto); | |
1376 | #endif | |
1377 | CvGV(cv) = CvGV(proto); | |
1378 | CvSTASH(cv) = CvSTASH(proto); | |
46330ab1 | 1379 | OP_REFCNT_LOCK; |
9755d405 | 1380 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
46330ab1 | 1381 | OP_REFCNT_UNLOCK; |
9755d405 | 1382 | CvSTART(cv) = CvSTART(proto); |
d7afa7f5 | 1383 | if (outside) { |
be2d5e07 | 1384 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc_simple(outside); |
d7afa7f5 JH |
1385 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
1386 | } | |
9755d405 JH |
1387 | |
1388 | if (SvPOK(proto)) | |
5e7e76a3 | 1389 | sv_setpvn((SV*)cv, SvPVX_const(proto), SvCUR(proto)); |
9755d405 | 1390 | |
cdf9dde0 | 1391 | CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE); |
9755d405 JH |
1392 | |
1393 | for (ix = fname; ix >= 0; ix--) | |
1394 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1395 | ||
1396 | av_fill(PL_comppad, fpad); | |
1397 | PL_curpad = AvARRAY(PL_comppad); | |
1398 | ||
1399 | for (ix = fpad; ix > 0; ix--) { | |
0e2d6244 | 1400 | SV* const namesv = (ix <= fname) ? pname[ix] : NULL; |
9755d405 | 1401 | if (namesv && namesv != &PL_sv_undef) { |
5e7e76a3 | 1402 | const char *name = SvPVX_const(namesv); /* XXX */ |
9755d405 | 1403 | if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */ |
d7afa7f5 | 1404 | I32 off = pad_findlex(name, ix, cv); |
9755d405 | 1405 | if (!off) |
be2d5e07 | 1406 | PL_curpad[ix] = SvREFCNT_inc_simple(ppad[ix]); |
9755d405 JH |
1407 | else if (off != ix) |
1408 | Perl_croak(aTHX_ "panic: cv_clone: %s", name); | |
1409 | } | |
1410 | else { /* our own lexical */ | |
1411 | SV* sv; | |
1412 | if (*name == '&') { | |
1413 | /* anon code -- we'll come back for it */ | |
1414 | sv = SvREFCNT_inc(ppad[ix]); | |
1415 | } | |
1416 | else if (*name == '@') | |
1417 | sv = (SV*)newAV(); | |
1418 | else if (*name == '%') | |
1419 | sv = (SV*)newHV(); | |
1420 | else | |
133cdda0 | 1421 | sv = newSV(0); |
9755d405 JH |
1422 | if (!SvPADBUSY(sv)) |
1423 | SvPADMY_on(sv); | |
1424 | PL_curpad[ix] = sv; | |
1425 | } | |
1426 | } | |
1427 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
be2d5e07 | 1428 | PL_curpad[ix] = SvREFCNT_inc_NN(ppad[ix]); |
9755d405 JH |
1429 | } |
1430 | else { | |
133cdda0 | 1431 | SV* sv = newSV(0); |
9755d405 JH |
1432 | SvPADTMP_on(sv); |
1433 | PL_curpad[ix] = sv; | |
1434 | } | |
1435 | } | |
1436 | ||
1437 | /* Now that vars are all in place, clone nested closures. */ | |
1438 | ||
1439 | for (ix = fpad; ix > 0; ix--) { | |
1440 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; | |
1441 | if (namesv | |
1442 | && namesv != &PL_sv_undef | |
1443 | && !(SvFLAGS(namesv) & SVf_FAKE) | |
1444 | && *SvPVX(namesv) == '&' | |
1445 | && CvCLONE(ppad[ix])) | |
1446 | { | |
1447 | CV *kid = cv_clone2((CV*)ppad[ix], cv); | |
1448 | SvREFCNT_dec(ppad[ix]); | |
1449 | CvCLONE_on(kid); | |
1450 | SvPADMY_on(kid); | |
1451 | PL_curpad[ix] = (SV*)kid; | |
d7afa7f5 JH |
1452 | /* '&' entry points to child, so child mustn't refcnt parent */ |
1453 | CvWEAKOUTSIDE_on(kid); | |
1454 | SvREFCNT_dec(cv); | |
9755d405 JH |
1455 | } |
1456 | } | |
1457 | ||
1458 | DEBUG_Xv( | |
1459 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1460 | cv_dump(outside, "Outside"); | |
1461 | cv_dump(proto, "Proto"); | |
1462 | cv_dump(cv, "To"); | |
1463 | ); | |
1464 | ||
1465 | LEAVE; | |
1466 | ||
1467 | if (CvCONST(cv)) { | |
78fd745e | 1468 | SV* const const_sv = op_const_sv(CvSTART(cv), cv); |
9755d405 JH |
1469 | assert(const_sv); |
1470 | /* constant sub () { $x } closing over $x - see lib/constant.pm */ | |
1471 | SvREFCNT_dec(cv); | |
0e2d6244 | 1472 | cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv); |
9755d405 JH |
1473 | } |
1474 | ||
1475 | return cv; | |
1476 | } | |
1477 | ||
1478 | ||
1479 | /* | |
1480 | =for apidoc pad_fixup_inner_anons | |
1481 | ||
1482 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
d7afa7f5 JH |
1483 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1484 | moved to a pre-existing CV struct. | |
9755d405 JH |
1485 | |
1486 | =cut | |
1487 | */ | |
1488 | ||
1489 | void | |
1490 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1491 | { | |
1492 | I32 ix; | |
4996ee04 AL |
1493 | AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; |
1494 | AV * const comppad = (AV*)AvARRAY(padlist)[1]; | |
0188be2e AL |
1495 | SV ** const namepad = AvARRAY(comppad_name); |
1496 | SV ** const curpad = AvARRAY(comppad); | |
b21e3693 NC |
1497 | PERL_UNUSED_ARG(old_cv); |
1498 | ||
9755d405 | 1499 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
78fd745e | 1500 | const SV * const namesv = namepad[ix]; |
9755d405 | 1501 | if (namesv && namesv != &PL_sv_undef |
5e7e76a3 | 1502 | && *SvPVX_const(namesv) == '&') |
9755d405 | 1503 | { |
217ef1d7 | 1504 | CV * const innercv = (CV*)curpad[ix]; |
d7afa7f5 JH |
1505 | assert(CvWEAKOUTSIDE(innercv)); |
1506 | assert(CvOUTSIDE(innercv) == old_cv); | |
1507 | CvOUTSIDE(innercv) = new_cv; | |
9755d405 JH |
1508 | } |
1509 | } | |
1510 | } | |
1511 | ||
d7afa7f5 | 1512 | |
9755d405 JH |
1513 | /* |
1514 | =for apidoc pad_push | |
1515 | ||
1516 | Push a new pad frame onto the padlist, unless there's already a pad at | |
fb009b61 AL |
1517 | this depth, in which case don't bother creating a new one. Then give |
1518 | the new pad an @_ in slot zero. | |
9755d405 JH |
1519 | |
1520 | =cut | |
1521 | */ | |
1522 | ||
1523 | void | |
1524 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) | |
1525 | { | |
be2d5e07 | 1526 | if (depth > AvFILLp(padlist)) { |
d015a557 AL |
1527 | SV** const svp = AvARRAY(padlist); |
1528 | AV* const newpad = newAV(); | |
1529 | SV** const oldpad = AvARRAY(svp[depth-1]); | |
9755d405 | 1530 | I32 ix = AvFILLp((AV*)svp[1]); |
fb009b61 | 1531 | const I32 names_fill = AvFILLp((AV*)svp[0]); |
d015a557 | 1532 | SV** const names = AvARRAY(svp[0]); |
fb009b61 | 1533 | |
9755d405 JH |
1534 | for ( ;ix > 0; ix--) { |
1535 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
fb009b61 AL |
1536 | const char sigil = SvPVX_const(names[ix])[0]; |
1537 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') { | |
9755d405 JH |
1538 | /* outer lexical or anon code */ |
1539 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1540 | } | |
1541 | else { /* our own lexical */ | |
fb009b61 AL |
1542 | SV *sv; |
1543 | if (sigil == '@') | |
1544 | sv = (SV*)newAV(); | |
1545 | else if (sigil == '%') | |
1546 | sv = (SV*)newHV(); | |
9755d405 | 1547 | else |
133cdda0 | 1548 | sv = newSV(0); |
fb009b61 | 1549 | av_store(newpad, ix, sv); |
9755d405 JH |
1550 | SvPADMY_on(sv); |
1551 | } | |
1552 | } | |
1553 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
be2d5e07 | 1554 | av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix])); |
9755d405 JH |
1555 | } |
1556 | else { | |
1557 | /* save temporaries on recursion? */ | |
133cdda0 | 1558 | SV * const sv = newSV(0); |
fb009b61 | 1559 | av_store(newpad, ix, sv); |
9755d405 JH |
1560 | SvPADTMP_on(sv); |
1561 | } | |
1562 | } | |
1563 | if (has_args) { | |
1564 | AV* av = newAV(); | |
1565 | av_extend(av, 0); | |
1566 | av_store(newpad, 0, (SV*)av); | |
1567 | AvFLAGS(av) = AVf_REIFY; | |
1568 | } | |
1569 | av_store(padlist, depth, (SV*)newpad); | |
1570 | AvFILLp(padlist) = depth; | |
1571 | } | |
1572 | } | |
25e59d17 NC |
1573 | |
1574 | ||
1575 | HV * | |
1576 | Perl_pad_compname_type(pTHX_ const PADOFFSET po) | |
1577 | { | |
78fd745e | 1578 | SV* const * const av = av_fetch(PL_comppad_name, po, FALSE); |
62d59642 | 1579 | if ( SvPAD_TYPED(*av) ) { |
25e59d17 NC |
1580 | return SvSTASH(*av); |
1581 | } | |
0e2d6244 | 1582 | return NULL; |
25e59d17 | 1583 | } |
d8294a4d NC |
1584 | |
1585 | /* | |
1586 | * Local variables: | |
1587 | * c-indentation-style: bsd | |
1588 | * c-basic-offset: 4 | |
1589 | * indent-tabs-mode: t | |
1590 | * End: | |
1591 | * | |
1592 | * ex: set ts=8 sts=4 sw=4 noet: | |
1593 | */ |