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dd2155a4 |
1 | /* pad.c |
2 | * |
54ca4ee7 |
3 | * Copyright (C) 2002, 2003, 2004, 2005, 2006, by Larry Wall and others |
dd2155a4 |
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 | |
61296642 |
25 | This file contains the functions that create and manipulate scratchpads, |
166f8a29 |
26 | which are array-of-array data structures attached to a CV (ie a sub) |
61296642 |
27 | and which store lexical variables and opcode temporary and per-thread |
166f8a29 |
28 | values. |
29 | |
dd2155a4 |
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 |
b5c19bd7 |
35 | executing). Require'd files are simply evals without any outer lexical |
36 | scope. |
dd2155a4 |
37 | |
38 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, |
39 | but that is really the callers pad (a slot of which is allocated by |
40 | every entersub). |
41 | |
42 | The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items |
f3548bdc |
43 | is managed "manual" (mostly in pad.c) rather than normal av.c rules. |
dd2155a4 |
44 | The items in the AV are not SVs as for a normal AV, but other AVs: |
45 | |
46 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather |
47 | the "static type information" for lexicals. |
48 | |
49 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that |
50 | depth of recursion into the CV. |
51 | The 0'th slot of a frame AV is an AV which is @_. |
52 | other entries are storage for variables and op targets. |
53 | |
54 | During compilation: |
a6d05634 |
55 | C<PL_comppad_name> is set to the names AV. |
56 | C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1. |
57 | C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)). |
dd2155a4 |
58 | |
f3548bdc |
59 | During execution, C<PL_comppad> and C<PL_curpad> refer to the live |
60 | frame of the currently executing sub. |
61 | |
62 | Iterating over the names AV iterates over all possible pad |
dd2155a4 |
63 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
64 | &PL_sv_undef "names" (see pad_alloc()). |
65 | |
66 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. |
67 | The rest are op targets/GVs/constants which are statically allocated |
68 | or resolved at compile time. These don't have names by which they |
69 | can be looked up from Perl code at run time through eval"" like |
70 | my/our variables can be. Since they can't be looked up by "name" |
71 | but only by their index allocated at compile time (which is usually |
72 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. |
73 | |
74 | The SVs in the names AV have their PV being the name of the variable. |
75 | NV+1..IV inclusive is a range of cop_seq numbers for which the name is |
76 | valid. For typed lexicals name SV is SVt_PVMG and SvSTASH points at the |
63f10712 |
77 | type. For C<our> lexicals, the type is also SVt_PVMG, with the OURSTASH slot |
2892acdb |
78 | pointing at the stash of the associated global (so that duplicate C<our> |
79 | declarations in the same package can be detected). SvCUR is sometimes |
80 | hijacked to store the generation number during compilation. |
dd2155a4 |
81 | |
b5c19bd7 |
82 | If SvFAKE is set on the name SV, then that slot in the frame AV is |
83 | a REFCNT'ed reference to a lexical from "outside". In this case, |
84 | the name SV does not use NVX and IVX to store a cop_seq range, since it is |
85 | in scope throughout. Instead IVX stores some flags containing info about |
86 | the real lexical (is it declared in an anon, and is it capable of being |
87 | instantiated multiple times?), and for fake ANONs, NVX contains the index |
88 | within the parent's pad where the lexical's value is stored, to make |
89 | cloning quicker. |
dd2155a4 |
90 | |
a6d05634 |
91 | If the 'name' is '&' the corresponding entry in frame AV |
dd2155a4 |
92 | is a CV representing a possible closure. |
93 | (SvFAKE and name of '&' is not a meaningful combination currently but could |
94 | become so if C<my sub foo {}> is implemented.) |
95 | |
71f882da |
96 | Note that formats are treated as anon subs, and are cloned each time |
97 | write is called (if necessary). |
98 | |
e6e7068b |
99 | The flag SVf_PADSTALE is cleared on lexicals each time the my() is executed, |
100 | and set on scope exit. This allows the 'Variable $x is not available' warning |
101 | to be generated in evals, such as |
102 | |
103 | { my $x = 1; sub f { eval '$x'} } f(); |
104 | |
dd2155a4 |
105 | =cut |
106 | */ |
107 | |
108 | |
109 | #include "EXTERN.h" |
110 | #define PERL_IN_PAD_C |
111 | #include "perl.h" |
952306ac |
112 | #include "keywords.h" |
dd2155a4 |
113 | |
114 | |
115 | #define PAD_MAX 999999999 |
116 | |
1dba731d |
117 | #ifdef PERL_MAD |
118 | void pad_peg(const char* s) { |
119 | static int pegcnt; |
120 | pegcnt++; |
121 | } |
122 | #endif |
dd2155a4 |
123 | |
124 | /* |
125 | =for apidoc pad_new |
126 | |
127 | Create a new compiling padlist, saving and updating the various global |
128 | vars at the same time as creating the pad itself. The following flags |
129 | can be OR'ed together: |
130 | |
131 | padnew_CLONE this pad is for a cloned CV |
132 | padnew_SAVE save old globals |
133 | padnew_SAVESUB also save extra stuff for start of sub |
134 | |
135 | =cut |
136 | */ |
137 | |
138 | PADLIST * |
c7c737cb |
139 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 |
140 | { |
97aff369 |
141 | dVAR; |
e1ec3a88 |
142 | AV *padlist, *padname, *pad; |
dd2155a4 |
143 | |
f3548bdc |
144 | ASSERT_CURPAD_LEGAL("pad_new"); |
145 | |
dd2155a4 |
146 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
147 | * vars (based on flags) rather than storing vals + addresses for |
148 | * each individually. Also see pad_block_start. |
149 | * XXX DAPM Try to see whether all these conditionals are required |
150 | */ |
151 | |
152 | /* save existing state, ... */ |
153 | |
154 | if (flags & padnew_SAVE) { |
3979c56f |
155 | SAVECOMPPAD(); |
dd2155a4 |
156 | SAVESPTR(PL_comppad_name); |
157 | if (! (flags & padnew_CLONE)) { |
158 | SAVEI32(PL_padix); |
159 | SAVEI32(PL_comppad_name_fill); |
160 | SAVEI32(PL_min_intro_pending); |
161 | SAVEI32(PL_max_intro_pending); |
b5c19bd7 |
162 | SAVEI32(PL_cv_has_eval); |
dd2155a4 |
163 | if (flags & padnew_SAVESUB) { |
164 | SAVEI32(PL_pad_reset_pending); |
165 | } |
166 | } |
167 | } |
168 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be |
169 | * saved - check at some pt that this is okay */ |
170 | |
171 | /* ... create new pad ... */ |
172 | |
173 | padlist = newAV(); |
174 | padname = newAV(); |
175 | pad = newAV(); |
176 | |
177 | if (flags & padnew_CLONE) { |
178 | /* XXX DAPM I dont know why cv_clone needs it |
179 | * doing differently yet - perhaps this separate branch can be |
180 | * dispensed with eventually ??? |
181 | */ |
182 | |
e1ec3a88 |
183 | AV * const a0 = newAV(); /* will be @_ */ |
dd2155a4 |
184 | av_extend(a0, 0); |
185 | av_store(pad, 0, (SV*)a0); |
11ca45c0 |
186 | AvREIFY_only(a0); |
dd2155a4 |
187 | } |
188 | else { |
a0714e2c |
189 | av_store(pad, 0, NULL); |
dd2155a4 |
190 | } |
191 | |
192 | AvREAL_off(padlist); |
193 | av_store(padlist, 0, (SV*)padname); |
194 | av_store(padlist, 1, (SV*)pad); |
195 | |
196 | /* ... then update state variables */ |
197 | |
198 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); |
199 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); |
200 | PL_curpad = AvARRAY(PL_comppad); |
201 | |
202 | if (! (flags & padnew_CLONE)) { |
203 | PL_comppad_name_fill = 0; |
204 | PL_min_intro_pending = 0; |
205 | PL_padix = 0; |
b5c19bd7 |
206 | PL_cv_has_eval = 0; |
dd2155a4 |
207 | } |
208 | |
209 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
b5c19bd7 |
210 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
dd2155a4 |
211 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
b5c19bd7 |
212 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
dd2155a4 |
213 | PTR2UV(padname), (UV)flags |
214 | ) |
215 | ); |
216 | |
217 | return (PADLIST*)padlist; |
218 | } |
219 | |
220 | /* |
221 | =for apidoc pad_undef |
222 | |
223 | Free the padlist associated with a CV. |
224 | If parts of it happen to be current, we null the relevant |
225 | PL_*pad* global vars so that we don't have any dangling references left. |
226 | We also repoint the CvOUTSIDE of any about-to-be-orphaned |
a3985cdc |
227 | inner subs to the outer of this cv. |
dd2155a4 |
228 | |
7dafbf52 |
229 | (This function should really be called pad_free, but the name was already |
230 | taken) |
231 | |
dd2155a4 |
232 | =cut |
233 | */ |
234 | |
235 | void |
a3985cdc |
236 | Perl_pad_undef(pTHX_ CV* cv) |
dd2155a4 |
237 | { |
97aff369 |
238 | dVAR; |
dd2155a4 |
239 | I32 ix; |
b64e5050 |
240 | const PADLIST * const padlist = CvPADLIST(cv); |
dd2155a4 |
241 | |
1dba731d |
242 | pad_peg("pad_undef"); |
dd2155a4 |
243 | if (!padlist) |
244 | return; |
0565a181 |
245 | if (SvIS_FREED(padlist)) /* may be during global destruction */ |
dd2155a4 |
246 | return; |
247 | |
248 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
b5c19bd7 |
249 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n", |
250 | PTR2UV(cv), PTR2UV(padlist)) |
dd2155a4 |
251 | ); |
252 | |
7dafbf52 |
253 | /* detach any '&' anon children in the pad; if afterwards they |
254 | * are still live, fix up their CvOUTSIDEs to point to our outside, |
255 | * bypassing us. */ |
256 | /* XXX DAPM for efficiency, we should only do this if we know we have |
257 | * children, or integrate this loop with general cleanup */ |
dd2155a4 |
258 | |
7dafbf52 |
259 | if (!PL_dirty) { /* don't bother during global destruction */ |
53c1dcc0 |
260 | CV * const outercv = CvOUTSIDE(cv); |
e1ec3a88 |
261 | const U32 seq = CvOUTSIDE_SEQ(cv); |
53c1dcc0 |
262 | AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; |
263 | SV ** const namepad = AvARRAY(comppad_name); |
264 | AV * const comppad = (AV*)AvARRAY(padlist)[1]; |
265 | SV ** const curpad = AvARRAY(comppad); |
dd2155a4 |
266 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
504618e9 |
267 | SV * const namesv = namepad[ix]; |
dd2155a4 |
268 | if (namesv && namesv != &PL_sv_undef |
b15aece3 |
269 | && *SvPVX_const(namesv) == '&') |
dd2155a4 |
270 | { |
7fc63493 |
271 | CV * const innercv = (CV*)curpad[ix]; |
10dc53a8 |
272 | U32 inner_rc = SvREFCNT(innercv); |
273 | assert(inner_rc); |
a0714e2c |
274 | namepad[ix] = NULL; |
7dafbf52 |
275 | SvREFCNT_dec(namesv); |
01773faa |
276 | |
277 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ |
a0714e2c |
278 | curpad[ix] = NULL; |
01773faa |
279 | SvREFCNT_dec(innercv); |
10dc53a8 |
280 | inner_rc--; |
01773faa |
281 | } |
b37c2d43 |
282 | |
283 | /* in use, not just a prototype */ |
284 | if (inner_rc && (CvOUTSIDE(innercv) == cv)) { |
7dafbf52 |
285 | assert(CvWEAKOUTSIDE(innercv)); |
9d1ce744 |
286 | /* don't relink to grandfather if he's being freed */ |
287 | if (outercv && SvREFCNT(outercv)) { |
288 | CvWEAKOUTSIDE_off(innercv); |
289 | CvOUTSIDE(innercv) = outercv; |
290 | CvOUTSIDE_SEQ(innercv) = seq; |
f84c484e |
291 | SvREFCNT_inc_simple_void_NN(outercv); |
9d1ce744 |
292 | } |
293 | else { |
601f1833 |
294 | CvOUTSIDE(innercv) = NULL; |
9d1ce744 |
295 | } |
dd2155a4 |
296 | } |
297 | } |
298 | } |
299 | } |
7dafbf52 |
300 | |
dd2155a4 |
301 | ix = AvFILLp(padlist); |
302 | while (ix >= 0) { |
b37c2d43 |
303 | const SV* const sv = AvARRAY(padlist)[ix--]; |
304 | if (sv) { |
305 | if (sv == (SV*)PL_comppad_name) |
306 | PL_comppad_name = NULL; |
307 | else if (sv == (SV*)PL_comppad) { |
308 | PL_comppad = NULL; |
309 | PL_curpad = NULL; |
310 | } |
dd2155a4 |
311 | } |
312 | SvREFCNT_dec(sv); |
313 | } |
314 | SvREFCNT_dec((SV*)CvPADLIST(cv)); |
4608196e |
315 | CvPADLIST(cv) = NULL; |
dd2155a4 |
316 | } |
317 | |
318 | |
319 | |
320 | |
321 | /* |
322 | =for apidoc pad_add_name |
323 | |
b5c19bd7 |
324 | Create a new name and associated PADMY SV in the current pad; return the |
325 | offset. |
dd2155a4 |
326 | If C<typestash> is valid, the name is for a typed lexical; set the |
327 | name's stash to that value. |
328 | If C<ourstash> is valid, it's an our lexical, set the name's |
035dab74 |
329 | OURSTASH to that value |
dd2155a4 |
330 | |
dd2155a4 |
331 | If fake, it means we're cloning an existing entry |
332 | |
333 | =cut |
334 | */ |
335 | |
dd2155a4 |
336 | PADOFFSET |
952306ac |
337 | Perl_pad_add_name(pTHX_ const char *name, HV* typestash, HV* ourstash, bool fake, bool state) |
dd2155a4 |
338 | { |
97aff369 |
339 | dVAR; |
504618e9 |
340 | const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
561b68a9 |
341 | SV* const namesv = newSV(0); |
dd2155a4 |
342 | |
f3548bdc |
343 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
344 | |
dd2155a4 |
345 | |
2892acdb |
346 | sv_upgrade(namesv, (ourstash || typestash) ? SVt_PVMG : SVt_PVNV); |
dd2155a4 |
347 | sv_setpv(namesv, name); |
348 | |
349 | if (typestash) { |
63f10712 |
350 | assert(SvTYPE(namesv) == SVt_PVMG); |
00b1698f |
351 | SvPAD_TYPED_on(namesv); |
b37c2d43 |
352 | SvSTASH_set(namesv, (HV*)SvREFCNT_inc_simple_NN((SV*)typestash)); |
dd2155a4 |
353 | } |
354 | if (ourstash) { |
00b1698f |
355 | SvPAD_OUR_on(namesv); |
035dab74 |
356 | OURSTASH_set(namesv, ourstash); |
f84c484e |
357 | SvREFCNT_inc_simple_void_NN(ourstash); |
dd2155a4 |
358 | } |
952306ac |
359 | else if (state) { |
360 | SvPAD_STATE_on(namesv); |
361 | } |
dd2155a4 |
362 | |
363 | av_store(PL_comppad_name, offset, namesv); |
b5c19bd7 |
364 | if (fake) { |
dd2155a4 |
365 | SvFAKE_on(namesv); |
b5c19bd7 |
366 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
367 | "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name)); |
368 | } |
dd2155a4 |
369 | else { |
ee6cee0c |
370 | /* not yet introduced */ |
9d6ce603 |
371 | SvNV_set(namesv, (NV)PAD_MAX); /* min */ |
b19bbeda |
372 | SvIV_set(namesv, 0); /* max */ |
ee6cee0c |
373 | |
dd2155a4 |
374 | if (!PL_min_intro_pending) |
375 | PL_min_intro_pending = offset; |
376 | PL_max_intro_pending = offset; |
b5c19bd7 |
377 | /* if it's not a simple scalar, replace with an AV or HV */ |
f3548bdc |
378 | /* XXX DAPM since slot has been allocated, replace |
379 | * av_store with PL_curpad[offset] ? */ |
dd2155a4 |
380 | if (*name == '@') |
381 | av_store(PL_comppad, offset, (SV*)newAV()); |
382 | else if (*name == '%') |
383 | av_store(PL_comppad, offset, (SV*)newHV()); |
384 | SvPADMY_on(PL_curpad[offset]); |
b5c19bd7 |
385 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
386 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", |
387 | (long)offset, name, PTR2UV(PL_curpad[offset]))); |
dd2155a4 |
388 | } |
389 | |
390 | return offset; |
391 | } |
392 | |
393 | |
394 | |
395 | |
396 | /* |
397 | =for apidoc pad_alloc |
398 | |
399 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto |
400 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards |
cf525c36 |
401 | for a slot which has no name and no active value. |
dd2155a4 |
402 | |
403 | =cut |
404 | */ |
405 | |
406 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), |
407 | * or at least rationalise ??? */ |
6d640399 |
408 | /* And flag whether the incoming name is UTF8 or 8 bit? |
409 | Could do this either with the +ve/-ve hack of the HV code, or expanding |
410 | the flag bits. Either way, this makes proper Unicode safe pad support. |
411 | Also could change the sv structure to make the NV a union with 2 U32s, |
412 | so that SvCUR() could stop being overloaded in pad SVs. |
413 | NWC |
414 | */ |
dd2155a4 |
415 | |
416 | PADOFFSET |
417 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) |
418 | { |
97aff369 |
419 | dVAR; |
dd2155a4 |
420 | SV *sv; |
421 | I32 retval; |
422 | |
6136c704 |
423 | PERL_UNUSED_ARG(optype); |
f3548bdc |
424 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
425 | |
dd2155a4 |
426 | if (AvARRAY(PL_comppad) != PL_curpad) |
427 | Perl_croak(aTHX_ "panic: pad_alloc"); |
428 | if (PL_pad_reset_pending) |
429 | pad_reset(); |
430 | if (tmptype & SVs_PADMY) { |
235cc2e3 |
431 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
dd2155a4 |
432 | retval = AvFILLp(PL_comppad); |
433 | } |
434 | else { |
551405c4 |
435 | SV * const * const names = AvARRAY(PL_comppad_name); |
e1ec3a88 |
436 | const SSize_t names_fill = AvFILLp(PL_comppad_name); |
dd2155a4 |
437 | for (;;) { |
438 | /* |
439 | * "foreach" index vars temporarily become aliases to non-"my" |
440 | * values. Thus we must skip, not just pad values that are |
441 | * marked as current pad values, but also those with names. |
442 | */ |
443 | /* HVDS why copy to sv here? we don't seem to use it */ |
444 | if (++PL_padix <= names_fill && |
445 | (sv = names[PL_padix]) && sv != &PL_sv_undef) |
446 | continue; |
447 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); |
448 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && |
449 | !IS_PADGV(sv) && !IS_PADCONST(sv)) |
450 | break; |
451 | } |
452 | retval = PL_padix; |
453 | } |
454 | SvFLAGS(sv) |= tmptype; |
455 | PL_curpad = AvARRAY(PL_comppad); |
456 | |
457 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
458 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", |
459 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, |
460 | PL_op_name[optype])); |
fd0854ff |
461 | #ifdef DEBUG_LEAKING_SCALARS |
462 | sv->sv_debug_optype = optype; |
463 | sv->sv_debug_inpad = 1; |
fd0854ff |
464 | #endif |
a212c8b5 |
465 | return (PADOFFSET)retval; |
dd2155a4 |
466 | } |
467 | |
468 | /* |
469 | =for apidoc pad_add_anon |
470 | |
471 | Add an anon code entry to the current compiling pad |
472 | |
473 | =cut |
474 | */ |
475 | |
476 | PADOFFSET |
477 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) |
478 | { |
97aff369 |
479 | dVAR; |
dd2155a4 |
480 | PADOFFSET ix; |
561b68a9 |
481 | SV* const name = newSV(0); |
1dba731d |
482 | pad_peg("add_anon"); |
dd2155a4 |
483 | sv_upgrade(name, SVt_PVNV); |
484 | sv_setpvn(name, "&", 1); |
b19bbeda |
485 | SvIV_set(name, -1); |
9d6ce603 |
486 | SvNV_set(name, 1); |
dd2155a4 |
487 | ix = pad_alloc(op_type, SVs_PADMY); |
488 | av_store(PL_comppad_name, ix, name); |
f3548bdc |
489 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 |
490 | av_store(PL_comppad, ix, sv); |
491 | SvPADMY_on(sv); |
7dafbf52 |
492 | |
493 | /* to avoid ref loops, we never have parent + child referencing each |
494 | * other simultaneously */ |
495 | if (CvOUTSIDE((CV*)sv)) { |
496 | assert(!CvWEAKOUTSIDE((CV*)sv)); |
497 | CvWEAKOUTSIDE_on((CV*)sv); |
498 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); |
499 | } |
dd2155a4 |
500 | return ix; |
501 | } |
502 | |
503 | |
504 | |
505 | /* |
506 | =for apidoc pad_check_dup |
507 | |
508 | Check for duplicate declarations: report any of: |
509 | * a my in the current scope with the same name; |
510 | * an our (anywhere in the pad) with the same name and the same stash |
511 | as C<ourstash> |
512 | C<is_our> indicates that the name to check is an 'our' declaration |
513 | |
514 | =cut |
515 | */ |
516 | |
517 | /* XXX DAPM integrate this into pad_add_name ??? */ |
518 | |
519 | void |
e1ec3a88 |
520 | Perl_pad_check_dup(pTHX_ const char *name, bool is_our, const HV *ourstash) |
dd2155a4 |
521 | { |
97aff369 |
522 | dVAR; |
53c1dcc0 |
523 | SV **svp; |
dd2155a4 |
524 | PADOFFSET top, off; |
525 | |
f3548bdc |
526 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
041457d9 |
527 | if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC)) |
dd2155a4 |
528 | return; /* nothing to check */ |
529 | |
530 | svp = AvARRAY(PL_comppad_name); |
531 | top = AvFILLp(PL_comppad_name); |
532 | /* check the current scope */ |
533 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same |
534 | * type ? */ |
535 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { |
53c1dcc0 |
536 | SV * const sv = svp[off]; |
537 | if (sv |
dd2155a4 |
538 | && sv != &PL_sv_undef |
ee6cee0c |
539 | && !SvFAKE(sv) |
dd2155a4 |
540 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
b15aece3 |
541 | && strEQ(name, SvPVX_const(sv))) |
dd2155a4 |
542 | { |
00b1698f |
543 | if (is_our && (SvPAD_OUR(sv))) |
7f73a9f1 |
544 | break; /* "our" masking "our" */ |
dd2155a4 |
545 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
546 | "\"%s\" variable %s masks earlier declaration in same %s", |
952306ac |
547 | (is_our ? "our" : PL_in_my == KEY_my ? "my" : "state"), |
dd2155a4 |
548 | name, |
549 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); |
550 | --off; |
551 | break; |
552 | } |
553 | } |
554 | /* check the rest of the pad */ |
555 | if (is_our) { |
556 | do { |
53c1dcc0 |
557 | SV * const sv = svp[off]; |
558 | if (sv |
dd2155a4 |
559 | && sv != &PL_sv_undef |
ee6cee0c |
560 | && !SvFAKE(sv) |
dd2155a4 |
561 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
035dab74 |
562 | && OURSTASH(sv) == ourstash |
b15aece3 |
563 | && strEQ(name, SvPVX_const(sv))) |
dd2155a4 |
564 | { |
565 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
566 | "\"our\" variable %s redeclared", name); |
624f69f5 |
567 | if ((I32)off <= PL_comppad_name_floor) |
7f73a9f1 |
568 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
569 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); |
dd2155a4 |
570 | break; |
571 | } |
572 | } while ( off-- > 0 ); |
573 | } |
574 | } |
575 | |
576 | |
dd2155a4 |
577 | /* |
578 | =for apidoc pad_findmy |
579 | |
580 | Given a lexical name, try to find its offset, first in the current pad, |
581 | or failing that, in the pads of any lexically enclosing subs (including |
582 | the complications introduced by eval). If the name is found in an outer pad, |
583 | then a fake entry is added to the current pad. |
584 | Returns the offset in the current pad, or NOT_IN_PAD on failure. |
585 | |
586 | =cut |
587 | */ |
588 | |
589 | PADOFFSET |
e1ec3a88 |
590 | Perl_pad_findmy(pTHX_ const char *name) |
dd2155a4 |
591 | { |
97aff369 |
592 | dVAR; |
b5c19bd7 |
593 | SV *out_sv; |
594 | int out_flags; |
929a0744 |
595 | I32 offset; |
e1ec3a88 |
596 | const AV *nameav; |
929a0744 |
597 | SV **name_svp; |
dd2155a4 |
598 | |
1dba731d |
599 | pad_peg("pad_findmy"); |
9f7d9405 |
600 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
4608196e |
601 | NULL, &out_sv, &out_flags); |
9f7d9405 |
602 | if ((PADOFFSET)offset != NOT_IN_PAD) |
929a0744 |
603 | return offset; |
604 | |
605 | /* look for an our that's being introduced; this allows |
606 | * our $foo = 0 unless defined $foo; |
607 | * to not give a warning. (Yes, this is a hack) */ |
608 | |
609 | nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; |
610 | name_svp = AvARRAY(nameav); |
611 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
551405c4 |
612 | const SV * const namesv = name_svp[offset]; |
929a0744 |
613 | if (namesv && namesv != &PL_sv_undef |
614 | && !SvFAKE(namesv) |
00b1698f |
615 | && (SvPAD_OUR(namesv)) |
b15aece3 |
616 | && strEQ(SvPVX_const(namesv), name) |
4cf4a199 |
617 | && U_32(SvNVX(namesv)) == PAD_MAX /* min */ |
929a0744 |
618 | ) |
619 | return offset; |
620 | } |
621 | return NOT_IN_PAD; |
dd2155a4 |
622 | } |
623 | |
e1f795dc |
624 | /* |
625 | * Returns the offset of a lexical $_, if there is one, at run time. |
626 | * Used by the UNDERBAR XS macro. |
627 | */ |
628 | |
629 | PADOFFSET |
29289021 |
630 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc |
631 | { |
97aff369 |
632 | dVAR; |
e1f795dc |
633 | SV *out_sv; |
634 | int out_flags; |
635 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, |
4608196e |
636 | NULL, &out_sv, &out_flags); |
e1f795dc |
637 | } |
dd2155a4 |
638 | |
dd2155a4 |
639 | /* |
640 | =for apidoc pad_findlex |
641 | |
642 | Find a named lexical anywhere in a chain of nested pads. Add fake entries |
b5c19bd7 |
643 | in the inner pads if it's found in an outer one. |
644 | |
645 | Returns the offset in the bottom pad of the lex or the fake lex. |
646 | cv is the CV in which to start the search, and seq is the current cop_seq |
647 | to match against. If warn is true, print appropriate warnings. The out_* |
648 | vars return values, and so are pointers to where the returned values |
649 | should be stored. out_capture, if non-null, requests that the innermost |
650 | instance of the lexical is captured; out_name_sv is set to the innermost |
651 | matched namesv or fake namesv; out_flags returns the flags normally |
652 | associated with the IVX field of a fake namesv. |
653 | |
654 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, |
655 | then comes back down, adding fake entries as it goes. It has to be this way |
656 | because fake namesvs in anon protoypes have to store in NVX the index into |
657 | the parent pad. |
dd2155a4 |
658 | |
659 | =cut |
660 | */ |
661 | |
b5c19bd7 |
662 | /* Flags set in the SvIVX field of FAKE namesvs */ |
663 | |
664 | #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */ |
665 | #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */ |
666 | |
667 | /* the CV has finished being compiled. This is not a sufficient test for |
668 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ |
669 | #define CvCOMPILED(cv) CvROOT(cv) |
670 | |
71f882da |
671 | /* the CV does late binding of its lexicals */ |
672 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) |
673 | |
b5c19bd7 |
674 | |
dd2155a4 |
675 | STATIC PADOFFSET |
e1ec3a88 |
676 | S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn, |
b5c19bd7 |
677 | SV** out_capture, SV** out_name_sv, int *out_flags) |
dd2155a4 |
678 | { |
97aff369 |
679 | dVAR; |
b5c19bd7 |
680 | I32 offset, new_offset; |
681 | SV *new_capture; |
682 | SV **new_capturep; |
b64e5050 |
683 | const AV * const padlist = CvPADLIST(cv); |
dd2155a4 |
684 | |
b5c19bd7 |
685 | *out_flags = 0; |
a3985cdc |
686 | |
b5c19bd7 |
687 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
688 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", |
689 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); |
dd2155a4 |
690 | |
b5c19bd7 |
691 | /* first, search this pad */ |
dd2155a4 |
692 | |
b5c19bd7 |
693 | if (padlist) { /* not an undef CV */ |
694 | I32 fake_offset = 0; |
551405c4 |
695 | const AV * const nameav = (AV*)AvARRAY(padlist)[0]; |
696 | SV * const * const name_svp = AvARRAY(nameav); |
ee6cee0c |
697 | |
b5c19bd7 |
698 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
551405c4 |
699 | const SV * const namesv = name_svp[offset]; |
b5c19bd7 |
700 | if (namesv && namesv != &PL_sv_undef |
b15aece3 |
701 | && strEQ(SvPVX_const(namesv), name)) |
b5c19bd7 |
702 | { |
703 | if (SvFAKE(namesv)) |
704 | fake_offset = offset; /* in case we don't find a real one */ |
4cf4a199 |
705 | else if ( seq > U_32(SvNVX(namesv)) /* min */ |
706 | && seq <= (U32)SvIVX(namesv)) /* max */ |
b5c19bd7 |
707 | break; |
ee6cee0c |
708 | } |
709 | } |
710 | |
b5c19bd7 |
711 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
712 | if (offset > 0) { /* not fake */ |
713 | fake_offset = 0; |
714 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
715 | |
716 | /* set PAD_FAKELEX_MULTI if this lex can have multiple |
717 | * instances. For now, we just test !CvUNIQUE(cv), but |
718 | * ideally, we should detect my's declared within loops |
719 | * etc - this would allow a wider range of 'not stayed |
720 | * shared' warnings. We also treated alreadly-compiled |
721 | * lexes as not multi as viewed from evals. */ |
722 | |
723 | *out_flags = CvANON(cv) ? |
724 | PAD_FAKELEX_ANON : |
725 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) |
726 | ? PAD_FAKELEX_MULTI : 0; |
727 | |
728 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
729 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n", |
4cf4a199 |
730 | PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)), |
b5c19bd7 |
731 | (long)SvIVX(*out_name_sv))); |
732 | } |
733 | else { /* fake match */ |
734 | offset = fake_offset; |
735 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
736 | *out_flags = SvIVX(*out_name_sv); |
737 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
19a5c512 |
738 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 |
739 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
740 | (unsigned long)SvNVX(*out_name_sv) |
741 | )); |
742 | } |
dd2155a4 |
743 | |
b5c19bd7 |
744 | /* return the lex? */ |
dd2155a4 |
745 | |
b5c19bd7 |
746 | if (out_capture) { |
dd2155a4 |
747 | |
b5c19bd7 |
748 | /* our ? */ |
00b1698f |
749 | if (SvPAD_OUR(*out_name_sv)) { |
a0714e2c |
750 | *out_capture = NULL; |
b5c19bd7 |
751 | return offset; |
752 | } |
ee6cee0c |
753 | |
b5c19bd7 |
754 | /* trying to capture from an anon prototype? */ |
755 | if (CvCOMPILED(cv) |
756 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) |
757 | : *out_flags & PAD_FAKELEX_ANON) |
758 | { |
759 | if (warn && ckWARN(WARN_CLOSURE)) |
760 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
761 | "Variable \"%s\" is not available", name); |
a0714e2c |
762 | *out_capture = NULL; |
b5c19bd7 |
763 | } |
ee6cee0c |
764 | |
b5c19bd7 |
765 | /* real value */ |
766 | else { |
767 | int newwarn = warn; |
768 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) |
769 | && warn && ckWARN(WARN_CLOSURE)) { |
770 | newwarn = 0; |
771 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
772 | "Variable \"%s\" will not stay shared", name); |
773 | } |
dd2155a4 |
774 | |
b5c19bd7 |
775 | if (fake_offset && CvANON(cv) |
776 | && CvCLONE(cv) &&!CvCLONED(cv)) |
777 | { |
778 | SV *n; |
779 | /* not yet caught - look further up */ |
780 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
781 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", |
782 | PTR2UV(cv))); |
783 | n = *out_name_sv; |
282e1742 |
784 | (void) pad_findlex(name, CvOUTSIDE(cv), |
785 | CvOUTSIDE_SEQ(cv), |
b5c19bd7 |
786 | newwarn, out_capture, out_name_sv, out_flags); |
787 | *out_name_sv = n; |
788 | return offset; |
dd2155a4 |
789 | } |
b5c19bd7 |
790 | |
791 | *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ |
792 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; |
793 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
794 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", |
19a5c512 |
795 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 |
796 | |
797 | if (SvPADSTALE(*out_capture)) { |
798 | if (ckWARN(WARN_CLOSURE)) |
ee6cee0c |
799 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b5c19bd7 |
800 | "Variable \"%s\" is not available", name); |
a0714e2c |
801 | *out_capture = NULL; |
dd2155a4 |
802 | } |
803 | } |
b5c19bd7 |
804 | if (!*out_capture) { |
805 | if (*name == '@') |
806 | *out_capture = sv_2mortal((SV*)newAV()); |
807 | else if (*name == '%') |
808 | *out_capture = sv_2mortal((SV*)newHV()); |
809 | else |
810 | *out_capture = sv_newmortal(); |
811 | } |
dd2155a4 |
812 | } |
b5c19bd7 |
813 | |
814 | return offset; |
ee6cee0c |
815 | } |
b5c19bd7 |
816 | } |
817 | |
818 | /* it's not in this pad - try above */ |
819 | |
820 | if (!CvOUTSIDE(cv)) |
821 | return NOT_IN_PAD; |
9f7d9405 |
822 | |
b5c19bd7 |
823 | /* out_capture non-null means caller wants us to capture lex; in |
71f882da |
824 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 |
825 | new_capturep = out_capture ? out_capture : |
4608196e |
826 | CvLATE(cv) ? NULL : &new_capture; |
b5c19bd7 |
827 | |
828 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, |
829 | new_capturep, out_name_sv, out_flags); |
9f7d9405 |
830 | if ((PADOFFSET)offset == NOT_IN_PAD) |
b5c19bd7 |
831 | return NOT_IN_PAD; |
9f7d9405 |
832 | |
b5c19bd7 |
833 | /* found in an outer CV. Add appropriate fake entry to this pad */ |
834 | |
835 | /* don't add new fake entries (via eval) to CVs that we have already |
836 | * finished compiling, or to undef CVs */ |
837 | if (CvCOMPILED(cv) || !padlist) |
838 | return 0; /* this dummy (and invalid) value isnt used by the caller */ |
839 | |
840 | { |
841 | SV *new_namesv; |
53c1dcc0 |
842 | AV * const ocomppad_name = PL_comppad_name; |
843 | PAD * const ocomppad = PL_comppad; |
b5c19bd7 |
844 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
845 | PL_comppad = (AV*)AvARRAY(padlist)[1]; |
846 | PL_curpad = AvARRAY(PL_comppad); |
847 | |
848 | new_offset = pad_add_name( |
b15aece3 |
849 | SvPVX_const(*out_name_sv), |
00b1698f |
850 | SvPAD_TYPED(*out_name_sv) |
5c284bb0 |
851 | ? SvSTASH(*out_name_sv) : NULL, |
035dab74 |
852 | OURSTASH(*out_name_sv), |
952306ac |
853 | 1, /* fake */ |
854 | 0 /* not a state variable */ |
b5c19bd7 |
855 | ); |
856 | |
857 | new_namesv = AvARRAY(PL_comppad_name)[new_offset]; |
b19bbeda |
858 | SvIV_set(new_namesv, *out_flags); |
b5c19bd7 |
859 | |
9d6ce603 |
860 | SvNV_set(new_namesv, (NV)0); |
00b1698f |
861 | if (SvPAD_OUR(new_namesv)) { |
6f207bd3 |
862 | NOOP; /* do nothing */ |
b5c19bd7 |
863 | } |
71f882da |
864 | else if (CvLATE(cv)) { |
b5c19bd7 |
865 | /* delayed creation - just note the offset within parent pad */ |
9d6ce603 |
866 | SvNV_set(new_namesv, (NV)offset); |
b5c19bd7 |
867 | CvCLONE_on(cv); |
868 | } |
869 | else { |
870 | /* immediate creation - capture outer value right now */ |
871 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); |
872 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
873 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", |
874 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); |
dd2155a4 |
875 | } |
b5c19bd7 |
876 | *out_name_sv = new_namesv; |
877 | *out_flags = SvIVX(new_namesv); |
878 | |
879 | PL_comppad_name = ocomppad_name; |
880 | PL_comppad = ocomppad; |
4608196e |
881 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL; |
dd2155a4 |
882 | } |
b5c19bd7 |
883 | return new_offset; |
dd2155a4 |
884 | } |
885 | |
fb8a9836 |
886 | |
887 | #ifdef DEBUGGING |
dd2155a4 |
888 | /* |
889 | =for apidoc pad_sv |
890 | |
891 | Get the value at offset po in the current pad. |
892 | Use macro PAD_SV instead of calling this function directly. |
893 | |
894 | =cut |
895 | */ |
896 | |
897 | |
898 | SV * |
899 | Perl_pad_sv(pTHX_ PADOFFSET po) |
900 | { |
97aff369 |
901 | dVAR; |
f3548bdc |
902 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 |
903 | |
dd2155a4 |
904 | if (!po) |
905 | Perl_croak(aTHX_ "panic: pad_sv po"); |
dd2155a4 |
906 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
907 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
908 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 |
909 | ); |
910 | return PL_curpad[po]; |
911 | } |
912 | |
913 | |
914 | /* |
915 | =for apidoc pad_setsv |
916 | |
917 | Set the entry at offset po in the current pad to sv. |
918 | Use the macro PAD_SETSV() rather than calling this function directly. |
919 | |
920 | =cut |
921 | */ |
922 | |
dd2155a4 |
923 | void |
924 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) |
925 | { |
97aff369 |
926 | dVAR; |
f3548bdc |
927 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 |
928 | |
929 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
930 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
931 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 |
932 | ); |
933 | PL_curpad[po] = sv; |
934 | } |
935 | #endif |
936 | |
937 | |
938 | |
939 | /* |
940 | =for apidoc pad_block_start |
941 | |
942 | Update the pad compilation state variables on entry to a new block |
943 | |
944 | =cut |
945 | */ |
946 | |
947 | /* XXX DAPM perhaps: |
948 | * - integrate this in general state-saving routine ??? |
949 | * - combine with the state-saving going on in pad_new ??? |
950 | * - introduce a new SAVE type that does all this in one go ? |
951 | */ |
952 | |
953 | void |
954 | Perl_pad_block_start(pTHX_ int full) |
955 | { |
97aff369 |
956 | dVAR; |
f3548bdc |
957 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 |
958 | SAVEI32(PL_comppad_name_floor); |
959 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); |
960 | if (full) |
961 | PL_comppad_name_fill = PL_comppad_name_floor; |
962 | if (PL_comppad_name_floor < 0) |
963 | PL_comppad_name_floor = 0; |
964 | SAVEI32(PL_min_intro_pending); |
965 | SAVEI32(PL_max_intro_pending); |
966 | PL_min_intro_pending = 0; |
967 | SAVEI32(PL_comppad_name_fill); |
968 | SAVEI32(PL_padix_floor); |
969 | PL_padix_floor = PL_padix; |
970 | PL_pad_reset_pending = FALSE; |
971 | } |
972 | |
973 | |
974 | /* |
975 | =for apidoc intro_my |
976 | |
977 | "Introduce" my variables to visible status. |
978 | |
979 | =cut |
980 | */ |
981 | |
982 | U32 |
983 | Perl_intro_my(pTHX) |
984 | { |
97aff369 |
985 | dVAR; |
dd2155a4 |
986 | SV **svp; |
dd2155a4 |
987 | I32 i; |
988 | |
f3548bdc |
989 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 |
990 | if (! PL_min_intro_pending) |
991 | return PL_cop_seqmax; |
992 | |
993 | svp = AvARRAY(PL_comppad_name); |
994 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { |
53c1dcc0 |
995 | SV * const sv = svp[i]; |
996 | |
997 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !SvIVX(sv)) { |
b19bbeda |
998 | SvIV_set(sv, PAD_MAX); /* Don't know scope end yet. */ |
9d6ce603 |
999 | SvNV_set(sv, (NV)PL_cop_seqmax); |
dd2155a4 |
1000 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 |
1001 | "Pad intromy: %ld \"%s\", (%ld,%ld)\n", |
b15aece3 |
1002 | (long)i, SvPVX_const(sv), |
4cf4a199 |
1003 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 |
1004 | ); |
1005 | } |
1006 | } |
1007 | PL_min_intro_pending = 0; |
1008 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ |
1009 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
1010 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); |
1011 | |
1012 | return PL_cop_seqmax++; |
1013 | } |
1014 | |
1015 | /* |
1016 | =for apidoc pad_leavemy |
1017 | |
1018 | Cleanup at end of scope during compilation: set the max seq number for |
1019 | lexicals in this scope and warn of any lexicals that never got introduced. |
1020 | |
1021 | =cut |
1022 | */ |
1023 | |
1024 | void |
1025 | Perl_pad_leavemy(pTHX) |
1026 | { |
97aff369 |
1027 | dVAR; |
dd2155a4 |
1028 | I32 off; |
551405c4 |
1029 | SV * const * const svp = AvARRAY(PL_comppad_name); |
dd2155a4 |
1030 | |
1031 | PL_pad_reset_pending = FALSE; |
1032 | |
f3548bdc |
1033 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 |
1034 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
1035 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { |
53c1dcc0 |
1036 | const SV * const sv = svp[off]; |
1037 | if (sv && sv != &PL_sv_undef |
ee6cee0c |
1038 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) |
dd2155a4 |
1039 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
95b63a38 |
1040 | "%"SVf" never introduced", |
1041 | (void*)sv); |
dd2155a4 |
1042 | } |
1043 | } |
1044 | /* "Deintroduce" my variables that are leaving with this scope. */ |
1045 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { |
53c1dcc0 |
1046 | const SV * const sv = svp[off]; |
1047 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) { |
b19bbeda |
1048 | SvIV_set(sv, PL_cop_seqmax); |
dd2155a4 |
1049 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 |
1050 | "Pad leavemy: %ld \"%s\", (%ld,%ld)\n", |
b15aece3 |
1051 | (long)off, SvPVX_const(sv), |
4cf4a199 |
1052 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 |
1053 | ); |
1054 | } |
1055 | } |
1056 | PL_cop_seqmax++; |
1057 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
1058 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); |
1059 | } |
1060 | |
1061 | |
1062 | /* |
1063 | =for apidoc pad_swipe |
1064 | |
1065 | Abandon the tmp in the current pad at offset po and replace with a |
1066 | new one. |
1067 | |
1068 | =cut |
1069 | */ |
1070 | |
1071 | void |
1072 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) |
1073 | { |
97aff369 |
1074 | dVAR; |
f3548bdc |
1075 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 |
1076 | if (!PL_curpad) |
1077 | return; |
1078 | if (AvARRAY(PL_comppad) != PL_curpad) |
1079 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); |
1080 | if (!po) |
1081 | Perl_croak(aTHX_ "panic: pad_swipe po"); |
1082 | |
1083 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1084 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", |
1085 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); |
1086 | |
1087 | if (PL_curpad[po]) |
1088 | SvPADTMP_off(PL_curpad[po]); |
1089 | if (refadjust) |
1090 | SvREFCNT_dec(PL_curpad[po]); |
1091 | |
9ad9869c |
1092 | |
1093 | /* if pad tmps aren't shared between ops, then there's no need to |
1094 | * create a new tmp when an existing op is freed */ |
1095 | #ifdef USE_BROKEN_PAD_RESET |
561b68a9 |
1096 | PL_curpad[po] = newSV(0); |
dd2155a4 |
1097 | SvPADTMP_on(PL_curpad[po]); |
9ad9869c |
1098 | #else |
1099 | PL_curpad[po] = &PL_sv_undef; |
97bf4a8d |
1100 | #endif |
dd2155a4 |
1101 | if ((I32)po < PL_padix) |
1102 | PL_padix = po - 1; |
1103 | } |
1104 | |
1105 | |
1106 | /* |
1107 | =for apidoc pad_reset |
1108 | |
1109 | Mark all the current temporaries for reuse |
1110 | |
1111 | =cut |
1112 | */ |
1113 | |
1114 | /* XXX pad_reset() is currently disabled because it results in serious bugs. |
1115 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed |
1116 | * on the stack by OPs that use them, there are several ways to get an alias |
1117 | * to a shared TARG. Such an alias will change randomly and unpredictably. |
1118 | * We avoid doing this until we can think of a Better Way. |
1119 | * GSAR 97-10-29 */ |
1120 | void |
1121 | Perl_pad_reset(pTHX) |
1122 | { |
97aff369 |
1123 | dVAR; |
dd2155a4 |
1124 | #ifdef USE_BROKEN_PAD_RESET |
dd2155a4 |
1125 | if (AvARRAY(PL_comppad) != PL_curpad) |
1126 | Perl_croak(aTHX_ "panic: pad_reset curpad"); |
1127 | |
1128 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1129 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", |
1130 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), |
1131 | (long)PL_padix, (long)PL_padix_floor |
1132 | ) |
1133 | ); |
1134 | |
1135 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ |
e1ec3a88 |
1136 | register I32 po; |
dd2155a4 |
1137 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1138 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) |
1139 | SvPADTMP_off(PL_curpad[po]); |
1140 | } |
1141 | PL_padix = PL_padix_floor; |
1142 | } |
1143 | #endif |
1144 | PL_pad_reset_pending = FALSE; |
1145 | } |
1146 | |
1147 | |
1148 | /* |
1149 | =for apidoc pad_tidy |
1150 | |
1151 | Tidy up a pad after we've finished compiling it: |
1152 | * remove most stuff from the pads of anonsub prototypes; |
1153 | * give it a @_; |
1154 | * mark tmps as such. |
1155 | |
1156 | =cut |
1157 | */ |
1158 | |
1159 | /* XXX DAPM surely most of this stuff should be done properly |
1160 | * at the right time beforehand, rather than going around afterwards |
1161 | * cleaning up our mistakes ??? |
1162 | */ |
1163 | |
1164 | void |
1165 | Perl_pad_tidy(pTHX_ padtidy_type type) |
1166 | { |
27da23d5 |
1167 | dVAR; |
dd2155a4 |
1168 | |
f3548bdc |
1169 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 |
1170 | |
1171 | /* If this CV has had any 'eval-capable' ops planted in it |
1172 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any |
1173 | * anon prototypes in the chain of CVs should be marked as cloneable, |
1174 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets |
1175 | * the right CvOUTSIDE. |
1176 | * If running with -d, *any* sub may potentially have an eval |
1177 | * excuted within it. |
1178 | */ |
1179 | |
1180 | if (PL_cv_has_eval || PL_perldb) { |
e1ec3a88 |
1181 | const CV *cv; |
b5c19bd7 |
1182 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1183 | if (cv != PL_compcv && CvCOMPILED(cv)) |
1184 | break; /* no need to mark already-compiled code */ |
1185 | if (CvANON(cv)) { |
1186 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
1187 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); |
1188 | CvCLONE_on(cv); |
1189 | } |
1190 | } |
1191 | } |
1192 | |
dd2155a4 |
1193 | /* extend curpad to match namepad */ |
1194 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) |
a0714e2c |
1195 | av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL); |
dd2155a4 |
1196 | |
1197 | if (type == padtidy_SUBCLONE) { |
551405c4 |
1198 | SV * const * const namep = AvARRAY(PL_comppad_name); |
504618e9 |
1199 | PADOFFSET ix; |
b5c19bd7 |
1200 | |
dd2155a4 |
1201 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1202 | SV *namesv; |
1203 | |
1204 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1205 | continue; |
1206 | /* |
1207 | * The only things that a clonable function needs in its |
b5c19bd7 |
1208 | * pad are anonymous subs. |
dd2155a4 |
1209 | * The rest are created anew during cloning. |
1210 | */ |
a0714e2c |
1211 | if (!((namesv = namep[ix]) != NULL && |
dd2155a4 |
1212 | namesv != &PL_sv_undef && |
b15aece3 |
1213 | *SvPVX_const(namesv) == '&')) |
dd2155a4 |
1214 | { |
1215 | SvREFCNT_dec(PL_curpad[ix]); |
a0714e2c |
1216 | PL_curpad[ix] = NULL; |
dd2155a4 |
1217 | } |
1218 | } |
1219 | } |
1220 | else if (type == padtidy_SUB) { |
1221 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ |
53c1dcc0 |
1222 | AV * const av = newAV(); /* Will be @_ */ |
dd2155a4 |
1223 | av_extend(av, 0); |
1224 | av_store(PL_comppad, 0, (SV*)av); |
11ca45c0 |
1225 | AvREIFY_only(av); |
dd2155a4 |
1226 | } |
1227 | |
1228 | /* XXX DAPM rationalise these two similar branches */ |
1229 | |
1230 | if (type == padtidy_SUB) { |
504618e9 |
1231 | PADOFFSET ix; |
dd2155a4 |
1232 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1233 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1234 | continue; |
1235 | if (!SvPADMY(PL_curpad[ix])) |
1236 | SvPADTMP_on(PL_curpad[ix]); |
1237 | } |
1238 | } |
1239 | else if (type == padtidy_FORMAT) { |
504618e9 |
1240 | PADOFFSET ix; |
dd2155a4 |
1241 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1242 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) |
1243 | SvPADTMP_on(PL_curpad[ix]); |
1244 | } |
1245 | } |
f3548bdc |
1246 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 |
1247 | } |
1248 | |
1249 | |
1250 | /* |
1251 | =for apidoc pad_free |
1252 | |
8627550a |
1253 | Free the SV at offset po in the current pad. |
dd2155a4 |
1254 | |
1255 | =cut |
1256 | */ |
1257 | |
1258 | /* XXX DAPM integrate with pad_swipe ???? */ |
1259 | void |
1260 | Perl_pad_free(pTHX_ PADOFFSET po) |
1261 | { |
97aff369 |
1262 | dVAR; |
f3548bdc |
1263 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 |
1264 | if (!PL_curpad) |
1265 | return; |
1266 | if (AvARRAY(PL_comppad) != PL_curpad) |
1267 | Perl_croak(aTHX_ "panic: pad_free curpad"); |
1268 | if (!po) |
1269 | Perl_croak(aTHX_ "panic: pad_free po"); |
1270 | |
1271 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1272 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", |
1273 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) |
1274 | ); |
1275 | |
1276 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { |
1277 | SvPADTMP_off(PL_curpad[po]); |
1278 | #ifdef USE_ITHREADS |
7e736055 |
1279 | /* SV could be a shared hash key (eg bugid #19022) */ |
1280 | if ( |
f8c7b90f |
1281 | #ifdef PERL_OLD_COPY_ON_WRITE |
7e736055 |
1282 | !SvIsCOW(PL_curpad[po]) |
1283 | #else |
1284 | !SvFAKE(PL_curpad[po]) |
dd2155a4 |
1285 | #endif |
7e736055 |
1286 | ) |
dd2155a4 |
1287 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 |
1288 | #endif |
1289 | } |
1290 | if ((I32)po < PL_padix) |
1291 | PL_padix = po - 1; |
1292 | } |
1293 | |
1294 | |
1295 | |
1296 | /* |
1297 | =for apidoc do_dump_pad |
1298 | |
1299 | Dump the contents of a padlist |
1300 | |
1301 | =cut |
1302 | */ |
1303 | |
1304 | void |
1305 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) |
1306 | { |
97aff369 |
1307 | dVAR; |
e1ec3a88 |
1308 | const AV *pad_name; |
1309 | const AV *pad; |
dd2155a4 |
1310 | SV **pname; |
1311 | SV **ppad; |
dd2155a4 |
1312 | I32 ix; |
1313 | |
1314 | if (!padlist) { |
1315 | return; |
1316 | } |
1317 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); |
1318 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); |
1319 | pname = AvARRAY(pad_name); |
1320 | ppad = AvARRAY(pad); |
1321 | Perl_dump_indent(aTHX_ level, file, |
1322 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", |
1323 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) |
1324 | ); |
1325 | |
1326 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { |
e1ec3a88 |
1327 | const SV *namesv = pname[ix]; |
dd2155a4 |
1328 | if (namesv && namesv == &PL_sv_undef) { |
a0714e2c |
1329 | namesv = NULL; |
dd2155a4 |
1330 | } |
1331 | if (namesv) { |
ee6cee0c |
1332 | if (SvFAKE(namesv)) |
1333 | Perl_dump_indent(aTHX_ level+1, file, |
c0fd1b42 |
1334 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c |
1335 | (int) ix, |
1336 | PTR2UV(ppad[ix]), |
1337 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
b15aece3 |
1338 | SvPVX_const(namesv), |
b5c19bd7 |
1339 | (unsigned long)SvIVX(namesv), |
1340 | (unsigned long)SvNVX(namesv) |
1341 | |
ee6cee0c |
1342 | ); |
1343 | else |
1344 | Perl_dump_indent(aTHX_ level+1, file, |
b5c19bd7 |
1345 | "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n", |
ee6cee0c |
1346 | (int) ix, |
1347 | PTR2UV(ppad[ix]), |
1348 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
4cf4a199 |
1349 | (long)U_32(SvNVX(namesv)), |
b5c19bd7 |
1350 | (long)SvIVX(namesv), |
b15aece3 |
1351 | SvPVX_const(namesv) |
ee6cee0c |
1352 | ); |
dd2155a4 |
1353 | } |
1354 | else if (full) { |
1355 | Perl_dump_indent(aTHX_ level+1, file, |
1356 | "%2d. 0x%"UVxf"<%lu>\n", |
1357 | (int) ix, |
1358 | PTR2UV(ppad[ix]), |
1359 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) |
1360 | ); |
1361 | } |
1362 | } |
1363 | } |
1364 | |
1365 | |
1366 | |
1367 | /* |
1368 | =for apidoc cv_dump |
1369 | |
1370 | dump the contents of a CV |
1371 | |
1372 | =cut |
1373 | */ |
1374 | |
1375 | #ifdef DEBUGGING |
1376 | STATIC void |
e1ec3a88 |
1377 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
dd2155a4 |
1378 | { |
97aff369 |
1379 | dVAR; |
53c1dcc0 |
1380 | const CV * const outside = CvOUTSIDE(cv); |
1381 | AV* const padlist = CvPADLIST(cv); |
dd2155a4 |
1382 | |
1383 | PerlIO_printf(Perl_debug_log, |
1384 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", |
1385 | title, |
1386 | PTR2UV(cv), |
1387 | (CvANON(cv) ? "ANON" |
71f882da |
1388 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 |
1389 | : (cv == PL_main_cv) ? "MAIN" |
1390 | : CvUNIQUE(cv) ? "UNIQUE" |
1391 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), |
1392 | PTR2UV(outside), |
1393 | (!outside ? "null" |
1394 | : CvANON(outside) ? "ANON" |
1395 | : (outside == PL_main_cv) ? "MAIN" |
1396 | : CvUNIQUE(outside) ? "UNIQUE" |
1397 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); |
1398 | |
1399 | PerlIO_printf(Perl_debug_log, |
1400 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); |
1401 | do_dump_pad(1, Perl_debug_log, padlist, 1); |
1402 | } |
1403 | #endif /* DEBUGGING */ |
1404 | |
1405 | |
1406 | |
1407 | |
1408 | |
1409 | /* |
1410 | =for apidoc cv_clone |
1411 | |
1412 | Clone a CV: make a new CV which points to the same code etc, but which |
1413 | has a newly-created pad built by copying the prototype pad and capturing |
1414 | any outer lexicals. |
1415 | |
1416 | =cut |
1417 | */ |
1418 | |
1419 | CV * |
1420 | Perl_cv_clone(pTHX_ CV *proto) |
1421 | { |
27da23d5 |
1422 | dVAR; |
dd2155a4 |
1423 | I32 ix; |
53c1dcc0 |
1424 | AV* const protopadlist = CvPADLIST(proto); |
1425 | const AV* const protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); |
1426 | const AV* const protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); |
1427 | SV** const pname = AvARRAY(protopad_name); |
1428 | SV** const ppad = AvARRAY(protopad); |
e1ec3a88 |
1429 | const I32 fname = AvFILLp(protopad_name); |
1430 | const I32 fpad = AvFILLp(protopad); |
dd2155a4 |
1431 | CV* cv; |
b5c19bd7 |
1432 | SV** outpad; |
1433 | CV* outside; |
71f882da |
1434 | long depth; |
dd2155a4 |
1435 | |
1436 | assert(!CvUNIQUE(proto)); |
1437 | |
71f882da |
1438 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1439 | * to a prototype; we instead want the cloned parent who called us. |
1440 | * Note that in general for formats, CvOUTSIDE != find_runcv */ |
1441 | |
1442 | outside = CvOUTSIDE(proto); |
1443 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) |
1444 | outside = find_runcv(NULL); |
1445 | depth = CvDEPTH(outside); |
1446 | assert(depth || SvTYPE(proto) == SVt_PVFM); |
1447 | if (!depth) |
1448 | depth = 1; |
b5c19bd7 |
1449 | assert(CvPADLIST(outside)); |
1450 | |
dd2155a4 |
1451 | ENTER; |
1452 | SAVESPTR(PL_compcv); |
1453 | |
561b68a9 |
1454 | cv = PL_compcv = (CV*)newSV(0); |
dd2155a4 |
1455 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
7dafbf52 |
1456 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 |
1457 | CvCLONED_on(cv); |
1458 | |
dd2155a4 |
1459 | #ifdef USE_ITHREADS |
aed2304a |
1460 | CvFILE(cv) = CvISXSUB(proto) ? CvFILE(proto) |
1461 | : savepv(CvFILE(proto)); |
dd2155a4 |
1462 | #else |
1463 | CvFILE(cv) = CvFILE(proto); |
1464 | #endif |
1465 | CvGV(cv) = CvGV(proto); |
1466 | CvSTASH(cv) = CvSTASH(proto); |
b34c0dd4 |
1467 | OP_REFCNT_LOCK; |
dd2155a4 |
1468 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
b34c0dd4 |
1469 | OP_REFCNT_UNLOCK; |
dd2155a4 |
1470 | CvSTART(cv) = CvSTART(proto); |
b37c2d43 |
1471 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc_simple(outside); |
b5c19bd7 |
1472 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
dd2155a4 |
1473 | |
1474 | if (SvPOK(proto)) |
b15aece3 |
1475 | sv_setpvn((SV*)cv, SvPVX_const(proto), SvCUR(proto)); |
dd2155a4 |
1476 | |
b7787f18 |
1477 | CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE); |
dd2155a4 |
1478 | |
b5c19bd7 |
1479 | av_fill(PL_comppad, fpad); |
dd2155a4 |
1480 | for (ix = fname; ix >= 0; ix--) |
1481 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); |
1482 | |
dd2155a4 |
1483 | PL_curpad = AvARRAY(PL_comppad); |
1484 | |
71f882da |
1485 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 |
1486 | |
dd2155a4 |
1487 | for (ix = fpad; ix > 0; ix--) { |
a0714e2c |
1488 | SV* const namesv = (ix <= fname) ? pname[ix] : NULL; |
1489 | SV *sv = NULL; |
71f882da |
1490 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ |
b5c19bd7 |
1491 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
71f882da |
1492 | sv = outpad[(I32)SvNVX(namesv)]; |
1493 | assert(sv); |
1494 | /* formats may have an inactive parent */ |
1495 | if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { |
1496 | if (ckWARN(WARN_CLOSURE)) |
1497 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b15aece3 |
1498 | "Variable \"%s\" is not available", SvPVX_const(namesv)); |
a0714e2c |
1499 | sv = NULL; |
71f882da |
1500 | } |
1501 | else { |
1502 | assert(!SvPADSTALE(sv)); |
f84c484e |
1503 | SvREFCNT_inc_simple_void_NN(sv); |
71f882da |
1504 | } |
dd2155a4 |
1505 | } |
71f882da |
1506 | if (!sv) { |
b15aece3 |
1507 | const char sigil = SvPVX_const(namesv)[0]; |
e1ec3a88 |
1508 | if (sigil == '&') |
dd2155a4 |
1509 | sv = SvREFCNT_inc(ppad[ix]); |
e1ec3a88 |
1510 | else if (sigil == '@') |
dd2155a4 |
1511 | sv = (SV*)newAV(); |
e1ec3a88 |
1512 | else if (sigil == '%') |
dd2155a4 |
1513 | sv = (SV*)newHV(); |
1514 | else |
561b68a9 |
1515 | sv = newSV(0); |
235cc2e3 |
1516 | SvPADMY_on(sv); |
dd2155a4 |
1517 | } |
1518 | } |
1519 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { |
f84c484e |
1520 | sv = SvREFCNT_inc_NN(ppad[ix]); |
dd2155a4 |
1521 | } |
1522 | else { |
561b68a9 |
1523 | sv = newSV(0); |
dd2155a4 |
1524 | SvPADTMP_on(sv); |
dd2155a4 |
1525 | } |
71f882da |
1526 | PL_curpad[ix] = sv; |
dd2155a4 |
1527 | } |
1528 | |
dd2155a4 |
1529 | DEBUG_Xv( |
1530 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); |
1531 | cv_dump(outside, "Outside"); |
1532 | cv_dump(proto, "Proto"); |
1533 | cv_dump(cv, "To"); |
1534 | ); |
1535 | |
1536 | LEAVE; |
1537 | |
1538 | if (CvCONST(cv)) { |
b5c19bd7 |
1539 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1540 | * The prototype was marked as a candiate for const-ization, |
1541 | * so try to grab the current const value, and if successful, |
1542 | * turn into a const sub: |
1543 | */ |
551405c4 |
1544 | SV* const const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 |
1545 | if (const_sv) { |
1546 | SvREFCNT_dec(cv); |
bd61b366 |
1547 | cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv); |
b5c19bd7 |
1548 | } |
1549 | else { |
1550 | CvCONST_off(cv); |
1551 | } |
dd2155a4 |
1552 | } |
1553 | |
1554 | return cv; |
1555 | } |
1556 | |
1557 | |
1558 | /* |
1559 | =for apidoc pad_fixup_inner_anons |
1560 | |
1561 | For any anon CVs in the pad, change CvOUTSIDE of that CV from |
7dafbf52 |
1562 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1563 | moved to a pre-existing CV struct. |
dd2155a4 |
1564 | |
1565 | =cut |
1566 | */ |
1567 | |
1568 | void |
1569 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) |
1570 | { |
97aff369 |
1571 | dVAR; |
dd2155a4 |
1572 | I32 ix; |
66a1b24b |
1573 | AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; |
1574 | AV * const comppad = (AV*)AvARRAY(padlist)[1]; |
53c1dcc0 |
1575 | SV ** const namepad = AvARRAY(comppad_name); |
1576 | SV ** const curpad = AvARRAY(comppad); |
294a48e9 |
1577 | PERL_UNUSED_ARG(old_cv); |
1578 | |
dd2155a4 |
1579 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
551405c4 |
1580 | const SV * const namesv = namepad[ix]; |
dd2155a4 |
1581 | if (namesv && namesv != &PL_sv_undef |
b15aece3 |
1582 | && *SvPVX_const(namesv) == '&') |
dd2155a4 |
1583 | { |
46c461b5 |
1584 | CV * const innercv = (CV*)curpad[ix]; |
7dafbf52 |
1585 | assert(CvWEAKOUTSIDE(innercv)); |
1586 | assert(CvOUTSIDE(innercv) == old_cv); |
1587 | CvOUTSIDE(innercv) = new_cv; |
dd2155a4 |
1588 | } |
1589 | } |
1590 | } |
1591 | |
7dafbf52 |
1592 | |
dd2155a4 |
1593 | /* |
1594 | =for apidoc pad_push |
1595 | |
1596 | Push a new pad frame onto the padlist, unless there's already a pad at |
26019298 |
1597 | this depth, in which case don't bother creating a new one. Then give |
1598 | the new pad an @_ in slot zero. |
dd2155a4 |
1599 | |
1600 | =cut |
1601 | */ |
1602 | |
1603 | void |
26019298 |
1604 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
dd2155a4 |
1605 | { |
97aff369 |
1606 | dVAR; |
b37c2d43 |
1607 | if (depth > AvFILLp(padlist)) { |
44f8325f |
1608 | SV** const svp = AvARRAY(padlist); |
1609 | AV* const newpad = newAV(); |
1610 | SV** const oldpad = AvARRAY(svp[depth-1]); |
dd2155a4 |
1611 | I32 ix = AvFILLp((AV*)svp[1]); |
e1ec3a88 |
1612 | const I32 names_fill = AvFILLp((AV*)svp[0]); |
44f8325f |
1613 | SV** const names = AvARRAY(svp[0]); |
26019298 |
1614 | AV *av; |
1615 | |
dd2155a4 |
1616 | for ( ;ix > 0; ix--) { |
1617 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
b15aece3 |
1618 | const char sigil = SvPVX_const(names[ix])[0]; |
26019298 |
1619 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') { |
dd2155a4 |
1620 | /* outer lexical or anon code */ |
1621 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
1622 | } |
1623 | else { /* our own lexical */ |
26019298 |
1624 | SV *sv; |
1625 | if (sigil == '@') |
1626 | sv = (SV*)newAV(); |
1627 | else if (sigil == '%') |
1628 | sv = (SV*)newHV(); |
dd2155a4 |
1629 | else |
561b68a9 |
1630 | sv = newSV(0); |
26019298 |
1631 | av_store(newpad, ix, sv); |
dd2155a4 |
1632 | SvPADMY_on(sv); |
1633 | } |
1634 | } |
1635 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
f84c484e |
1636 | av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix])); |
dd2155a4 |
1637 | } |
1638 | else { |
1639 | /* save temporaries on recursion? */ |
561b68a9 |
1640 | SV * const sv = newSV(0); |
26019298 |
1641 | av_store(newpad, ix, sv); |
dd2155a4 |
1642 | SvPADTMP_on(sv); |
1643 | } |
1644 | } |
26019298 |
1645 | av = newAV(); |
1646 | av_extend(av, 0); |
1647 | av_store(newpad, 0, (SV*)av); |
11ca45c0 |
1648 | AvREIFY_only(av); |
26019298 |
1649 | |
dd2155a4 |
1650 | av_store(padlist, depth, (SV*)newpad); |
1651 | AvFILLp(padlist) = depth; |
1652 | } |
1653 | } |
b21dc031 |
1654 | |
1655 | |
1656 | HV * |
1657 | Perl_pad_compname_type(pTHX_ const PADOFFSET po) |
1658 | { |
97aff369 |
1659 | dVAR; |
551405c4 |
1660 | SV* const * const av = av_fetch(PL_comppad_name, po, FALSE); |
00b1698f |
1661 | if ( SvPAD_TYPED(*av) ) { |
b21dc031 |
1662 | return SvSTASH(*av); |
1663 | } |
5c284bb0 |
1664 | return NULL; |
b21dc031 |
1665 | } |
66610fdd |
1666 | |
1667 | /* |
1668 | * Local variables: |
1669 | * c-indentation-style: bsd |
1670 | * c-basic-offset: 4 |
1671 | * indent-tabs-mode: t |
1672 | * End: |
1673 | * |
37442d52 |
1674 | * ex: set ts=8 sts=4 sw=4 noet: |
1675 | */ |