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dd2155a4 DM |
1 | /* pad.c |
2 | * | |
54ca4ee7 | 3 | * Copyright (C) 2002, 2003, 2004, 2005, 2006, by Larry Wall and others |
dd2155a4 DM |
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 DM |
28 | values. |
29 | ||
dd2155a4 DM |
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 DM |
35 | executing). Require'd files are simply evals without any outer lexical |
36 | scope. | |
dd2155a4 DM |
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 DM |
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 TM |
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 DM |
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 DM |
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 | |
77 | type. For C<our> lexicals, the type is SVt_PVGV, and GvSTASH points at the | |
8627550a | 78 | stash of the associated global (so that duplicate C<our> declarations in the |
dd2155a4 DM |
79 | same package can be detected). SvCUR is sometimes hijacked to |
80 | store the generation number during compilation. | |
81 | ||
b5c19bd7 DM |
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 DM |
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 DM |
96 | Note that formats are treated as anon subs, and are cloned each time |
97 | write is called (if necessary). | |
98 | ||
e6e7068b DM |
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 DM |
105 | =cut |
106 | */ | |
107 | ||
108 | ||
109 | #include "EXTERN.h" | |
110 | #define PERL_IN_PAD_C | |
111 | #include "perl.h" | |
112 | ||
113 | ||
114 | #define PAD_MAX 999999999 | |
115 | ||
116 | ||
117 | ||
118 | /* | |
119 | =for apidoc pad_new | |
120 | ||
121 | Create a new compiling padlist, saving and updating the various global | |
122 | vars at the same time as creating the pad itself. The following flags | |
123 | can be OR'ed together: | |
124 | ||
125 | padnew_CLONE this pad is for a cloned CV | |
126 | padnew_SAVE save old globals | |
127 | padnew_SAVESUB also save extra stuff for start of sub | |
128 | ||
129 | =cut | |
130 | */ | |
131 | ||
132 | PADLIST * | |
c7c737cb | 133 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 | 134 | { |
97aff369 | 135 | dVAR; |
e1ec3a88 | 136 | AV *padlist, *padname, *pad; |
dd2155a4 | 137 | |
f3548bdc DM |
138 | ASSERT_CURPAD_LEGAL("pad_new"); |
139 | ||
dd2155a4 DM |
140 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
141 | * vars (based on flags) rather than storing vals + addresses for | |
142 | * each individually. Also see pad_block_start. | |
143 | * XXX DAPM Try to see whether all these conditionals are required | |
144 | */ | |
145 | ||
146 | /* save existing state, ... */ | |
147 | ||
148 | if (flags & padnew_SAVE) { | |
3979c56f | 149 | SAVECOMPPAD(); |
dd2155a4 DM |
150 | SAVESPTR(PL_comppad_name); |
151 | if (! (flags & padnew_CLONE)) { | |
152 | SAVEI32(PL_padix); | |
153 | SAVEI32(PL_comppad_name_fill); | |
154 | SAVEI32(PL_min_intro_pending); | |
155 | SAVEI32(PL_max_intro_pending); | |
b5c19bd7 | 156 | SAVEI32(PL_cv_has_eval); |
dd2155a4 DM |
157 | if (flags & padnew_SAVESUB) { |
158 | SAVEI32(PL_pad_reset_pending); | |
159 | } | |
160 | } | |
161 | } | |
162 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be | |
163 | * saved - check at some pt that this is okay */ | |
164 | ||
165 | /* ... create new pad ... */ | |
166 | ||
167 | padlist = newAV(); | |
168 | padname = newAV(); | |
169 | pad = newAV(); | |
170 | ||
171 | if (flags & padnew_CLONE) { | |
172 | /* XXX DAPM I dont know why cv_clone needs it | |
173 | * doing differently yet - perhaps this separate branch can be | |
174 | * dispensed with eventually ??? | |
175 | */ | |
176 | ||
e1ec3a88 | 177 | AV * const a0 = newAV(); /* will be @_ */ |
dd2155a4 DM |
178 | av_extend(a0, 0); |
179 | av_store(pad, 0, (SV*)a0); | |
11ca45c0 | 180 | AvREIFY_only(a0); |
dd2155a4 DM |
181 | } |
182 | else { | |
dd2155a4 | 183 | av_store(pad, 0, Nullsv); |
dd2155a4 DM |
184 | } |
185 | ||
186 | AvREAL_off(padlist); | |
187 | av_store(padlist, 0, (SV*)padname); | |
188 | av_store(padlist, 1, (SV*)pad); | |
189 | ||
190 | /* ... then update state variables */ | |
191 | ||
192 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); | |
193 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); | |
194 | PL_curpad = AvARRAY(PL_comppad); | |
195 | ||
196 | if (! (flags & padnew_CLONE)) { | |
197 | PL_comppad_name_fill = 0; | |
198 | PL_min_intro_pending = 0; | |
199 | PL_padix = 0; | |
b5c19bd7 | 200 | PL_cv_has_eval = 0; |
dd2155a4 DM |
201 | } |
202 | ||
203 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 204 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
dd2155a4 | 205 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
b5c19bd7 | 206 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
dd2155a4 DM |
207 | PTR2UV(padname), (UV)flags |
208 | ) | |
209 | ); | |
210 | ||
211 | return (PADLIST*)padlist; | |
212 | } | |
213 | ||
214 | /* | |
215 | =for apidoc pad_undef | |
216 | ||
217 | Free the padlist associated with a CV. | |
218 | If parts of it happen to be current, we null the relevant | |
219 | PL_*pad* global vars so that we don't have any dangling references left. | |
220 | We also repoint the CvOUTSIDE of any about-to-be-orphaned | |
a3985cdc | 221 | inner subs to the outer of this cv. |
dd2155a4 | 222 | |
7dafbf52 DM |
223 | (This function should really be called pad_free, but the name was already |
224 | taken) | |
225 | ||
dd2155a4 DM |
226 | =cut |
227 | */ | |
228 | ||
229 | void | |
a3985cdc | 230 | Perl_pad_undef(pTHX_ CV* cv) |
dd2155a4 | 231 | { |
97aff369 | 232 | dVAR; |
dd2155a4 | 233 | I32 ix; |
b64e5050 | 234 | const PADLIST * const padlist = CvPADLIST(cv); |
dd2155a4 DM |
235 | |
236 | if (!padlist) | |
237 | return; | |
0565a181 | 238 | if (SvIS_FREED(padlist)) /* may be during global destruction */ |
dd2155a4 DM |
239 | return; |
240 | ||
241 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 DM |
242 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n", |
243 | PTR2UV(cv), PTR2UV(padlist)) | |
dd2155a4 DM |
244 | ); |
245 | ||
7dafbf52 DM |
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 */ | |
dd2155a4 | 251 | |
7dafbf52 | 252 | if (!PL_dirty) { /* don't bother during global destruction */ |
53c1dcc0 | 253 | CV * const outercv = CvOUTSIDE(cv); |
e1ec3a88 | 254 | const U32 seq = CvOUTSIDE_SEQ(cv); |
53c1dcc0 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); | |
dd2155a4 | 259 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
504618e9 | 260 | SV * const namesv = namepad[ix]; |
dd2155a4 | 261 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 262 | && *SvPVX_const(namesv) == '&') |
dd2155a4 | 263 | { |
7fc63493 | 264 | CV * const innercv = (CV*)curpad[ix]; |
10dc53a8 DM |
265 | U32 inner_rc = SvREFCNT(innercv); |
266 | assert(inner_rc); | |
7dafbf52 DM |
267 | namepad[ix] = Nullsv; |
268 | SvREFCNT_dec(namesv); | |
01773faa DM |
269 | |
270 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ | |
271 | curpad[ix] = Nullsv; | |
272 | SvREFCNT_dec(innercv); | |
10dc53a8 | 273 | inner_rc--; |
01773faa | 274 | } |
10dc53a8 | 275 | if (inner_rc /* in use, not just a prototype */ |
dd2155a4 DM |
276 | && CvOUTSIDE(innercv) == cv) |
277 | { | |
7dafbf52 | 278 | assert(CvWEAKOUTSIDE(innercv)); |
9d1ce744 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; | |
7fc63493 | 284 | (void)SvREFCNT_inc(outercv); |
9d1ce744 JH |
285 | } |
286 | else { | |
287 | CvOUTSIDE(innercv) = Nullcv; | |
288 | } | |
289 | ||
dd2155a4 | 290 | } |
9d1ce744 | 291 | |
dd2155a4 DM |
292 | } |
293 | } | |
294 | } | |
7dafbf52 | 295 | |
dd2155a4 DM |
296 | ix = AvFILLp(padlist); |
297 | while (ix >= 0) { | |
53c1dcc0 | 298 | SV* const sv = AvARRAY(padlist)[ix--]; |
dd2155a4 DM |
299 | if (!sv) |
300 | continue; | |
301 | if (sv == (SV*)PL_comppad_name) | |
7d49f689 | 302 | PL_comppad_name = NULL; |
dd2155a4 | 303 | else if (sv == (SV*)PL_comppad) { |
f3548bdc | 304 | PL_comppad = Null(PAD*); |
dd2155a4 DM |
305 | PL_curpad = Null(SV**); |
306 | } | |
307 | SvREFCNT_dec(sv); | |
308 | } | |
309 | SvREFCNT_dec((SV*)CvPADLIST(cv)); | |
310 | CvPADLIST(cv) = Null(PADLIST*); | |
311 | } | |
312 | ||
313 | ||
314 | ||
315 | ||
316 | /* | |
317 | =for apidoc pad_add_name | |
318 | ||
b5c19bd7 DM |
319 | Create a new name and associated PADMY SV in the current pad; return the |
320 | offset. | |
dd2155a4 DM |
321 | If C<typestash> is valid, the name is for a typed lexical; set the |
322 | name's stash to that value. | |
323 | If C<ourstash> is valid, it's an our lexical, set the name's | |
324 | GvSTASH to that value | |
325 | ||
dd2155a4 DM |
326 | If fake, it means we're cloning an existing entry |
327 | ||
328 | =cut | |
329 | */ | |
330 | ||
dd2155a4 | 331 | PADOFFSET |
e1ec3a88 | 332 | Perl_pad_add_name(pTHX_ const char *name, HV* typestash, HV* ourstash, bool fake) |
dd2155a4 | 333 | { |
97aff369 | 334 | dVAR; |
504618e9 | 335 | const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
53c1dcc0 | 336 | SV* const namesv = NEWSV(1102, 0); |
dd2155a4 | 337 | |
f3548bdc DM |
338 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
339 | ||
dd2155a4 | 340 | |
dd2155a4 DM |
341 | sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); |
342 | sv_setpv(namesv, name); | |
343 | ||
344 | if (typestash) { | |
345 | SvFLAGS(namesv) |= SVpad_TYPED; | |
b162af07 | 346 | SvSTASH_set(namesv, (HV*)SvREFCNT_inc((SV*) typestash)); |
dd2155a4 DM |
347 | } |
348 | if (ourstash) { | |
349 | SvFLAGS(namesv) |= SVpad_OUR; | |
e15faf7d NC |
350 | GvSTASH(namesv) = ourstash; |
351 | Perl_sv_add_backref(aTHX_ (SV*)ourstash, namesv); | |
dd2155a4 DM |
352 | } |
353 | ||
354 | av_store(PL_comppad_name, offset, namesv); | |
b5c19bd7 | 355 | if (fake) { |
dd2155a4 | 356 | SvFAKE_on(namesv); |
b5c19bd7 DM |
357 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
358 | "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name)); | |
359 | } | |
dd2155a4 | 360 | else { |
ee6cee0c | 361 | /* not yet introduced */ |
9d6ce603 | 362 | SvNV_set(namesv, (NV)PAD_MAX); /* min */ |
b19bbeda | 363 | SvIV_set(namesv, 0); /* max */ |
ee6cee0c | 364 | |
dd2155a4 DM |
365 | if (!PL_min_intro_pending) |
366 | PL_min_intro_pending = offset; | |
367 | PL_max_intro_pending = offset; | |
b5c19bd7 | 368 | /* if it's not a simple scalar, replace with an AV or HV */ |
f3548bdc DM |
369 | /* XXX DAPM since slot has been allocated, replace |
370 | * av_store with PL_curpad[offset] ? */ | |
dd2155a4 DM |
371 | if (*name == '@') |
372 | av_store(PL_comppad, offset, (SV*)newAV()); | |
373 | else if (*name == '%') | |
374 | av_store(PL_comppad, offset, (SV*)newHV()); | |
375 | SvPADMY_on(PL_curpad[offset]); | |
b5c19bd7 DM |
376 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
377 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", | |
378 | (long)offset, name, PTR2UV(PL_curpad[offset]))); | |
dd2155a4 DM |
379 | } |
380 | ||
381 | return offset; | |
382 | } | |
383 | ||
384 | ||
385 | ||
386 | ||
387 | /* | |
388 | =for apidoc pad_alloc | |
389 | ||
390 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto | |
391 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards | |
cf525c36 | 392 | for a slot which has no name and no active value. |
dd2155a4 DM |
393 | |
394 | =cut | |
395 | */ | |
396 | ||
397 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), | |
398 | * or at least rationalise ??? */ | |
6d640399 NC |
399 | /* And flag whether the incoming name is UTF8 or 8 bit? |
400 | Could do this either with the +ve/-ve hack of the HV code, or expanding | |
401 | the flag bits. Either way, this makes proper Unicode safe pad support. | |
402 | Also could change the sv structure to make the NV a union with 2 U32s, | |
403 | so that SvCUR() could stop being overloaded in pad SVs. | |
404 | NWC | |
405 | */ | |
dd2155a4 DM |
406 | |
407 | PADOFFSET | |
408 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) | |
409 | { | |
97aff369 | 410 | dVAR; |
dd2155a4 DM |
411 | SV *sv; |
412 | I32 retval; | |
413 | ||
6136c704 | 414 | PERL_UNUSED_ARG(optype); |
f3548bdc DM |
415 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
416 | ||
dd2155a4 DM |
417 | if (AvARRAY(PL_comppad) != PL_curpad) |
418 | Perl_croak(aTHX_ "panic: pad_alloc"); | |
419 | if (PL_pad_reset_pending) | |
420 | pad_reset(); | |
421 | if (tmptype & SVs_PADMY) { | |
235cc2e3 | 422 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
dd2155a4 DM |
423 | retval = AvFILLp(PL_comppad); |
424 | } | |
425 | else { | |
551405c4 | 426 | SV * const * const names = AvARRAY(PL_comppad_name); |
e1ec3a88 | 427 | const SSize_t names_fill = AvFILLp(PL_comppad_name); |
dd2155a4 DM |
428 | for (;;) { |
429 | /* | |
430 | * "foreach" index vars temporarily become aliases to non-"my" | |
431 | * values. Thus we must skip, not just pad values that are | |
432 | * marked as current pad values, but also those with names. | |
433 | */ | |
434 | /* HVDS why copy to sv here? we don't seem to use it */ | |
435 | if (++PL_padix <= names_fill && | |
436 | (sv = names[PL_padix]) && sv != &PL_sv_undef) | |
437 | continue; | |
438 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); | |
439 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && | |
440 | !IS_PADGV(sv) && !IS_PADCONST(sv)) | |
441 | break; | |
442 | } | |
443 | retval = PL_padix; | |
444 | } | |
445 | SvFLAGS(sv) |= tmptype; | |
446 | PL_curpad = AvARRAY(PL_comppad); | |
447 | ||
448 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
449 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", | |
450 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, | |
451 | PL_op_name[optype])); | |
fd0854ff DM |
452 | #ifdef DEBUG_LEAKING_SCALARS |
453 | sv->sv_debug_optype = optype; | |
454 | sv->sv_debug_inpad = 1; | |
fd0854ff | 455 | #endif |
a212c8b5 | 456 | return (PADOFFSET)retval; |
dd2155a4 DM |
457 | } |
458 | ||
459 | /* | |
460 | =for apidoc pad_add_anon | |
461 | ||
462 | Add an anon code entry to the current compiling pad | |
463 | ||
464 | =cut | |
465 | */ | |
466 | ||
467 | PADOFFSET | |
468 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) | |
469 | { | |
97aff369 | 470 | dVAR; |
dd2155a4 | 471 | PADOFFSET ix; |
b64e5050 | 472 | SV* const name = NEWSV(1106, 0); |
dd2155a4 DM |
473 | sv_upgrade(name, SVt_PVNV); |
474 | sv_setpvn(name, "&", 1); | |
b19bbeda | 475 | SvIV_set(name, -1); |
9d6ce603 | 476 | SvNV_set(name, 1); |
dd2155a4 DM |
477 | ix = pad_alloc(op_type, SVs_PADMY); |
478 | av_store(PL_comppad_name, ix, name); | |
f3548bdc | 479 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 DM |
480 | av_store(PL_comppad, ix, sv); |
481 | SvPADMY_on(sv); | |
7dafbf52 DM |
482 | |
483 | /* to avoid ref loops, we never have parent + child referencing each | |
484 | * other simultaneously */ | |
485 | if (CvOUTSIDE((CV*)sv)) { | |
486 | assert(!CvWEAKOUTSIDE((CV*)sv)); | |
487 | CvWEAKOUTSIDE_on((CV*)sv); | |
488 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); | |
489 | } | |
dd2155a4 DM |
490 | return ix; |
491 | } | |
492 | ||
493 | ||
494 | ||
495 | /* | |
496 | =for apidoc pad_check_dup | |
497 | ||
498 | Check for duplicate declarations: report any of: | |
499 | * a my in the current scope with the same name; | |
500 | * an our (anywhere in the pad) with the same name and the same stash | |
501 | as C<ourstash> | |
502 | C<is_our> indicates that the name to check is an 'our' declaration | |
503 | ||
504 | =cut | |
505 | */ | |
506 | ||
507 | /* XXX DAPM integrate this into pad_add_name ??? */ | |
508 | ||
509 | void | |
e1ec3a88 | 510 | Perl_pad_check_dup(pTHX_ const char *name, bool is_our, const HV *ourstash) |
dd2155a4 | 511 | { |
97aff369 | 512 | dVAR; |
53c1dcc0 | 513 | SV **svp; |
dd2155a4 DM |
514 | PADOFFSET top, off; |
515 | ||
f3548bdc | 516 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
041457d9 | 517 | if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC)) |
dd2155a4 DM |
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--) { | |
53c1dcc0 AL |
526 | SV * const sv = svp[off]; |
527 | if (sv | |
dd2155a4 | 528 | && sv != &PL_sv_undef |
ee6cee0c | 529 | && !SvFAKE(sv) |
dd2155a4 | 530 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
b15aece3 | 531 | && strEQ(name, SvPVX_const(sv))) |
dd2155a4 | 532 | { |
7f73a9f1 RGS |
533 | if (is_our && (SvFLAGS(sv) & SVpad_OUR)) |
534 | break; /* "our" masking "our" */ | |
dd2155a4 DM |
535 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
536 | "\"%s\" variable %s masks earlier declaration in same %s", | |
537 | (is_our ? "our" : "my"), | |
538 | name, | |
539 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); | |
540 | --off; | |
541 | break; | |
542 | } | |
543 | } | |
544 | /* check the rest of the pad */ | |
545 | if (is_our) { | |
546 | do { | |
53c1dcc0 AL |
547 | SV * const sv = svp[off]; |
548 | if (sv | |
dd2155a4 | 549 | && sv != &PL_sv_undef |
ee6cee0c | 550 | && !SvFAKE(sv) |
dd2155a4 DM |
551 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
552 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) | |
b15aece3 | 553 | && strEQ(name, SvPVX_const(sv))) |
dd2155a4 DM |
554 | { |
555 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
556 | "\"our\" variable %s redeclared", name); | |
624f69f5 | 557 | if ((I32)off <= PL_comppad_name_floor) |
7f73a9f1 RGS |
558 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
559 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
dd2155a4 DM |
560 | break; |
561 | } | |
562 | } while ( off-- > 0 ); | |
563 | } | |
564 | } | |
565 | ||
566 | ||
dd2155a4 DM |
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 | |
e1ec3a88 | 580 | Perl_pad_findmy(pTHX_ const char *name) |
dd2155a4 | 581 | { |
97aff369 | 582 | dVAR; |
b5c19bd7 DM |
583 | SV *out_sv; |
584 | int out_flags; | |
929a0744 | 585 | I32 offset; |
e1ec3a88 | 586 | const AV *nameav; |
929a0744 | 587 | SV **name_svp; |
dd2155a4 | 588 | |
929a0744 | 589 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
b5c19bd7 | 590 | Null(SV**), &out_sv, &out_flags); |
929a0744 DM |
591 | if (offset != NOT_IN_PAD) |
592 | return offset; | |
593 | ||
594 | /* look for an our that's being introduced; this allows | |
595 | * our $foo = 0 unless defined $foo; | |
596 | * to not give a warning. (Yes, this is a hack) */ | |
597 | ||
598 | nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; | |
599 | name_svp = AvARRAY(nameav); | |
600 | for (offset = AvFILLp(nameav); offset > 0; offset--) { | |
551405c4 | 601 | const SV * const namesv = name_svp[offset]; |
929a0744 DM |
602 | if (namesv && namesv != &PL_sv_undef |
603 | && !SvFAKE(namesv) | |
604 | && (SvFLAGS(namesv) & SVpad_OUR) | |
b15aece3 | 605 | && strEQ(SvPVX_const(namesv), name) |
4cf4a199 | 606 | && U_32(SvNVX(namesv)) == PAD_MAX /* min */ |
929a0744 DM |
607 | ) |
608 | return offset; | |
609 | } | |
610 | return NOT_IN_PAD; | |
dd2155a4 DM |
611 | } |
612 | ||
e1f795dc RGS |
613 | /* |
614 | * Returns the offset of a lexical $_, if there is one, at run time. | |
615 | * Used by the UNDERBAR XS macro. | |
616 | */ | |
617 | ||
618 | PADOFFSET | |
29289021 | 619 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc | 620 | { |
97aff369 | 621 | dVAR; |
e1f795dc RGS |
622 | SV *out_sv; |
623 | int out_flags; | |
624 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, | |
625 | Null(SV**), &out_sv, &out_flags); | |
626 | } | |
dd2155a4 | 627 | |
dd2155a4 DM |
628 | /* |
629 | =for apidoc pad_findlex | |
630 | ||
631 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
b5c19bd7 DM |
632 | in the inner pads if it's found in an outer one. |
633 | ||
634 | Returns the offset in the bottom pad of the lex or the fake lex. | |
635 | cv is the CV in which to start the search, and seq is the current cop_seq | |
636 | to match against. If warn is true, print appropriate warnings. The out_* | |
637 | vars return values, and so are pointers to where the returned values | |
638 | should be stored. out_capture, if non-null, requests that the innermost | |
639 | instance of the lexical is captured; out_name_sv is set to the innermost | |
640 | matched namesv or fake namesv; out_flags returns the flags normally | |
641 | associated with the IVX field of a fake namesv. | |
642 | ||
643 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, | |
644 | then comes back down, adding fake entries as it goes. It has to be this way | |
645 | because fake namesvs in anon protoypes have to store in NVX the index into | |
646 | the parent pad. | |
dd2155a4 DM |
647 | |
648 | =cut | |
649 | */ | |
650 | ||
b5c19bd7 DM |
651 | /* Flags set in the SvIVX field of FAKE namesvs */ |
652 | ||
653 | #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */ | |
654 | #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */ | |
655 | ||
656 | /* the CV has finished being compiled. This is not a sufficient test for | |
657 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ | |
658 | #define CvCOMPILED(cv) CvROOT(cv) | |
659 | ||
71f882da DM |
660 | /* the CV does late binding of its lexicals */ |
661 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) | |
662 | ||
b5c19bd7 | 663 | |
dd2155a4 | 664 | STATIC PADOFFSET |
e1ec3a88 | 665 | S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn, |
b5c19bd7 | 666 | SV** out_capture, SV** out_name_sv, int *out_flags) |
dd2155a4 | 667 | { |
97aff369 | 668 | dVAR; |
b5c19bd7 DM |
669 | I32 offset, new_offset; |
670 | SV *new_capture; | |
671 | SV **new_capturep; | |
b64e5050 | 672 | const AV * const padlist = CvPADLIST(cv); |
dd2155a4 | 673 | |
b5c19bd7 | 674 | *out_flags = 0; |
a3985cdc | 675 | |
b5c19bd7 DM |
676 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
677 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", | |
678 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); | |
dd2155a4 | 679 | |
b5c19bd7 | 680 | /* first, search this pad */ |
dd2155a4 | 681 | |
b5c19bd7 DM |
682 | if (padlist) { /* not an undef CV */ |
683 | I32 fake_offset = 0; | |
551405c4 AL |
684 | const AV * const nameav = (AV*)AvARRAY(padlist)[0]; |
685 | SV * const * const name_svp = AvARRAY(nameav); | |
ee6cee0c | 686 | |
b5c19bd7 | 687 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
551405c4 | 688 | const SV * const namesv = name_svp[offset]; |
b5c19bd7 | 689 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 690 | && strEQ(SvPVX_const(namesv), name)) |
b5c19bd7 DM |
691 | { |
692 | if (SvFAKE(namesv)) | |
693 | fake_offset = offset; /* in case we don't find a real one */ | |
4cf4a199 JH |
694 | else if ( seq > U_32(SvNVX(namesv)) /* min */ |
695 | && seq <= (U32)SvIVX(namesv)) /* max */ | |
b5c19bd7 | 696 | break; |
ee6cee0c DM |
697 | } |
698 | } | |
699 | ||
b5c19bd7 DM |
700 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
701 | if (offset > 0) { /* not fake */ | |
702 | fake_offset = 0; | |
703 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
704 | ||
705 | /* set PAD_FAKELEX_MULTI if this lex can have multiple | |
706 | * instances. For now, we just test !CvUNIQUE(cv), but | |
707 | * ideally, we should detect my's declared within loops | |
708 | * etc - this would allow a wider range of 'not stayed | |
709 | * shared' warnings. We also treated alreadly-compiled | |
710 | * lexes as not multi as viewed from evals. */ | |
711 | ||
712 | *out_flags = CvANON(cv) ? | |
713 | PAD_FAKELEX_ANON : | |
714 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) | |
715 | ? PAD_FAKELEX_MULTI : 0; | |
716 | ||
717 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
718 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n", | |
4cf4a199 | 719 | PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)), |
b5c19bd7 DM |
720 | (long)SvIVX(*out_name_sv))); |
721 | } | |
722 | else { /* fake match */ | |
723 | offset = fake_offset; | |
724 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
725 | *out_flags = SvIVX(*out_name_sv); | |
726 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
19a5c512 | 727 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 DM |
728 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
729 | (unsigned long)SvNVX(*out_name_sv) | |
730 | )); | |
731 | } | |
dd2155a4 | 732 | |
b5c19bd7 | 733 | /* return the lex? */ |
dd2155a4 | 734 | |
b5c19bd7 | 735 | if (out_capture) { |
dd2155a4 | 736 | |
b5c19bd7 DM |
737 | /* our ? */ |
738 | if ((SvFLAGS(*out_name_sv) & SVpad_OUR)) { | |
739 | *out_capture = Nullsv; | |
740 | return offset; | |
741 | } | |
ee6cee0c | 742 | |
b5c19bd7 DM |
743 | /* trying to capture from an anon prototype? */ |
744 | if (CvCOMPILED(cv) | |
745 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) | |
746 | : *out_flags & PAD_FAKELEX_ANON) | |
747 | { | |
748 | if (warn && ckWARN(WARN_CLOSURE)) | |
749 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
750 | "Variable \"%s\" is not available", name); | |
751 | *out_capture = Nullsv; | |
752 | } | |
ee6cee0c | 753 | |
b5c19bd7 DM |
754 | /* real value */ |
755 | else { | |
756 | int newwarn = warn; | |
757 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) | |
758 | && warn && ckWARN(WARN_CLOSURE)) { | |
759 | newwarn = 0; | |
760 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
761 | "Variable \"%s\" will not stay shared", name); | |
762 | } | |
dd2155a4 | 763 | |
b5c19bd7 DM |
764 | if (fake_offset && CvANON(cv) |
765 | && CvCLONE(cv) &&!CvCLONED(cv)) | |
766 | { | |
767 | SV *n; | |
768 | /* not yet caught - look further up */ | |
769 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
770 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", | |
771 | PTR2UV(cv))); | |
772 | n = *out_name_sv; | |
282e1742 DM |
773 | (void) pad_findlex(name, CvOUTSIDE(cv), |
774 | CvOUTSIDE_SEQ(cv), | |
b5c19bd7 DM |
775 | newwarn, out_capture, out_name_sv, out_flags); |
776 | *out_name_sv = n; | |
777 | return offset; | |
dd2155a4 | 778 | } |
b5c19bd7 DM |
779 | |
780 | *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ | |
781 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; | |
782 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
783 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", | |
19a5c512 | 784 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 DM |
785 | |
786 | if (SvPADSTALE(*out_capture)) { | |
787 | if (ckWARN(WARN_CLOSURE)) | |
ee6cee0c | 788 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b5c19bd7 DM |
789 | "Variable \"%s\" is not available", name); |
790 | *out_capture = Nullsv; | |
dd2155a4 DM |
791 | } |
792 | } | |
b5c19bd7 DM |
793 | if (!*out_capture) { |
794 | if (*name == '@') | |
795 | *out_capture = sv_2mortal((SV*)newAV()); | |
796 | else if (*name == '%') | |
797 | *out_capture = sv_2mortal((SV*)newHV()); | |
798 | else | |
799 | *out_capture = sv_newmortal(); | |
800 | } | |
dd2155a4 | 801 | } |
b5c19bd7 DM |
802 | |
803 | return offset; | |
ee6cee0c | 804 | } |
b5c19bd7 DM |
805 | } |
806 | ||
807 | /* it's not in this pad - try above */ | |
808 | ||
809 | if (!CvOUTSIDE(cv)) | |
810 | return NOT_IN_PAD; | |
811 | ||
812 | /* out_capture non-null means caller wants us to capture lex; in | |
71f882da | 813 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 | 814 | new_capturep = out_capture ? out_capture : |
71f882da | 815 | CvLATE(cv) ? Null(SV**) : &new_capture; |
b5c19bd7 DM |
816 | |
817 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, | |
818 | new_capturep, out_name_sv, out_flags); | |
819 | if (offset == NOT_IN_PAD) | |
820 | return NOT_IN_PAD; | |
821 | ||
822 | /* found in an outer CV. Add appropriate fake entry to this pad */ | |
823 | ||
824 | /* don't add new fake entries (via eval) to CVs that we have already | |
825 | * finished compiling, or to undef CVs */ | |
826 | if (CvCOMPILED(cv) || !padlist) | |
827 | return 0; /* this dummy (and invalid) value isnt used by the caller */ | |
828 | ||
829 | { | |
830 | SV *new_namesv; | |
53c1dcc0 AL |
831 | AV * const ocomppad_name = PL_comppad_name; |
832 | PAD * const ocomppad = PL_comppad; | |
b5c19bd7 DM |
833 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
834 | PL_comppad = (AV*)AvARRAY(padlist)[1]; | |
835 | PL_curpad = AvARRAY(PL_comppad); | |
836 | ||
837 | new_offset = pad_add_name( | |
b15aece3 | 838 | SvPVX_const(*out_name_sv), |
b5c19bd7 | 839 | (SvFLAGS(*out_name_sv) & SVpad_TYPED) |
5c284bb0 | 840 | ? SvSTASH(*out_name_sv) : NULL, |
b5c19bd7 | 841 | (SvFLAGS(*out_name_sv) & SVpad_OUR) |
5c284bb0 | 842 | ? GvSTASH(*out_name_sv) : NULL, |
b5c19bd7 DM |
843 | 1 /* fake */ |
844 | ); | |
845 | ||
846 | new_namesv = AvARRAY(PL_comppad_name)[new_offset]; | |
b19bbeda | 847 | SvIV_set(new_namesv, *out_flags); |
b5c19bd7 | 848 | |
9d6ce603 | 849 | SvNV_set(new_namesv, (NV)0); |
b5c19bd7 DM |
850 | if (SvFLAGS(new_namesv) & SVpad_OUR) { |
851 | /* do nothing */ | |
852 | } | |
71f882da | 853 | else if (CvLATE(cv)) { |
b5c19bd7 | 854 | /* delayed creation - just note the offset within parent pad */ |
9d6ce603 | 855 | SvNV_set(new_namesv, (NV)offset); |
b5c19bd7 DM |
856 | CvCLONE_on(cv); |
857 | } | |
858 | else { | |
859 | /* immediate creation - capture outer value right now */ | |
860 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); | |
861 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
862 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", | |
863 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); | |
dd2155a4 | 864 | } |
b5c19bd7 DM |
865 | *out_name_sv = new_namesv; |
866 | *out_flags = SvIVX(new_namesv); | |
867 | ||
868 | PL_comppad_name = ocomppad_name; | |
869 | PL_comppad = ocomppad; | |
870 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **); | |
dd2155a4 | 871 | } |
b5c19bd7 | 872 | return new_offset; |
dd2155a4 DM |
873 | } |
874 | ||
fb8a9836 AL |
875 | |
876 | #ifdef DEBUGGING | |
dd2155a4 DM |
877 | /* |
878 | =for apidoc pad_sv | |
879 | ||
880 | Get the value at offset po in the current pad. | |
881 | Use macro PAD_SV instead of calling this function directly. | |
882 | ||
883 | =cut | |
884 | */ | |
885 | ||
886 | ||
887 | SV * | |
888 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
889 | { | |
97aff369 | 890 | dVAR; |
f3548bdc | 891 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 | 892 | |
dd2155a4 DM |
893 | if (!po) |
894 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
895 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
896 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 897 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 DM |
898 | ); |
899 | return PL_curpad[po]; | |
900 | } | |
901 | ||
902 | ||
903 | /* | |
904 | =for apidoc pad_setsv | |
905 | ||
906 | Set the entry at offset po in the current pad to sv. | |
907 | Use the macro PAD_SETSV() rather than calling this function directly. | |
908 | ||
909 | =cut | |
910 | */ | |
911 | ||
dd2155a4 DM |
912 | void |
913 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
914 | { | |
97aff369 | 915 | dVAR; |
f3548bdc | 916 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 DM |
917 | |
918 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
919 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 920 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 DM |
921 | ); |
922 | PL_curpad[po] = sv; | |
923 | } | |
924 | #endif | |
925 | ||
926 | ||
927 | ||
928 | /* | |
929 | =for apidoc pad_block_start | |
930 | ||
931 | Update the pad compilation state variables on entry to a new block | |
932 | ||
933 | =cut | |
934 | */ | |
935 | ||
936 | /* XXX DAPM perhaps: | |
937 | * - integrate this in general state-saving routine ??? | |
938 | * - combine with the state-saving going on in pad_new ??? | |
939 | * - introduce a new SAVE type that does all this in one go ? | |
940 | */ | |
941 | ||
942 | void | |
943 | Perl_pad_block_start(pTHX_ int full) | |
944 | { | |
97aff369 | 945 | dVAR; |
f3548bdc | 946 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 DM |
947 | SAVEI32(PL_comppad_name_floor); |
948 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
949 | if (full) | |
950 | PL_comppad_name_fill = PL_comppad_name_floor; | |
951 | if (PL_comppad_name_floor < 0) | |
952 | PL_comppad_name_floor = 0; | |
953 | SAVEI32(PL_min_intro_pending); | |
954 | SAVEI32(PL_max_intro_pending); | |
955 | PL_min_intro_pending = 0; | |
956 | SAVEI32(PL_comppad_name_fill); | |
957 | SAVEI32(PL_padix_floor); | |
958 | PL_padix_floor = PL_padix; | |
959 | PL_pad_reset_pending = FALSE; | |
960 | } | |
961 | ||
962 | ||
963 | /* | |
964 | =for apidoc intro_my | |
965 | ||
966 | "Introduce" my variables to visible status. | |
967 | ||
968 | =cut | |
969 | */ | |
970 | ||
971 | U32 | |
972 | Perl_intro_my(pTHX) | |
973 | { | |
97aff369 | 974 | dVAR; |
dd2155a4 | 975 | SV **svp; |
dd2155a4 DM |
976 | I32 i; |
977 | ||
f3548bdc | 978 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 DM |
979 | if (! PL_min_intro_pending) |
980 | return PL_cop_seqmax; | |
981 | ||
982 | svp = AvARRAY(PL_comppad_name); | |
983 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
53c1dcc0 AL |
984 | SV * const sv = svp[i]; |
985 | ||
986 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !SvIVX(sv)) { | |
b19bbeda | 987 | SvIV_set(sv, PAD_MAX); /* Don't know scope end yet. */ |
9d6ce603 | 988 | SvNV_set(sv, (NV)PL_cop_seqmax); |
dd2155a4 | 989 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 | 990 | "Pad intromy: %ld \"%s\", (%ld,%ld)\n", |
b15aece3 | 991 | (long)i, SvPVX_const(sv), |
4cf4a199 | 992 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 DM |
993 | ); |
994 | } | |
995 | } | |
996 | PL_min_intro_pending = 0; | |
997 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
998 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
999 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
1000 | ||
1001 | return PL_cop_seqmax++; | |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | =for apidoc pad_leavemy | |
1006 | ||
1007 | Cleanup at end of scope during compilation: set the max seq number for | |
1008 | lexicals in this scope and warn of any lexicals that never got introduced. | |
1009 | ||
1010 | =cut | |
1011 | */ | |
1012 | ||
1013 | void | |
1014 | Perl_pad_leavemy(pTHX) | |
1015 | { | |
97aff369 | 1016 | dVAR; |
dd2155a4 | 1017 | I32 off; |
551405c4 | 1018 | SV * const * const svp = AvARRAY(PL_comppad_name); |
dd2155a4 DM |
1019 | |
1020 | PL_pad_reset_pending = FALSE; | |
1021 | ||
f3548bdc | 1022 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 DM |
1023 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
1024 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
53c1dcc0 AL |
1025 | const SV * const sv = svp[off]; |
1026 | if (sv && sv != &PL_sv_undef | |
ee6cee0c | 1027 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) |
dd2155a4 | 1028 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
35c1215d | 1029 | "%"SVf" never introduced", sv); |
dd2155a4 DM |
1030 | } |
1031 | } | |
1032 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
1033 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
53c1dcc0 AL |
1034 | const SV * const sv = svp[off]; |
1035 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) { | |
b19bbeda | 1036 | SvIV_set(sv, PL_cop_seqmax); |
dd2155a4 | 1037 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 | 1038 | "Pad leavemy: %ld \"%s\", (%ld,%ld)\n", |
b15aece3 | 1039 | (long)off, SvPVX_const(sv), |
4cf4a199 | 1040 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 DM |
1041 | ); |
1042 | } | |
1043 | } | |
1044 | PL_cop_seqmax++; | |
1045 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1046 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
1047 | } | |
1048 | ||
1049 | ||
1050 | /* | |
1051 | =for apidoc pad_swipe | |
1052 | ||
1053 | Abandon the tmp in the current pad at offset po and replace with a | |
1054 | new one. | |
1055 | ||
1056 | =cut | |
1057 | */ | |
1058 | ||
1059 | void | |
1060 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
1061 | { | |
97aff369 | 1062 | dVAR; |
f3548bdc | 1063 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 DM |
1064 | if (!PL_curpad) |
1065 | return; | |
1066 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1067 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
1068 | if (!po) | |
1069 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
1070 | ||
1071 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1072 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
1073 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
1074 | ||
1075 | if (PL_curpad[po]) | |
1076 | SvPADTMP_off(PL_curpad[po]); | |
1077 | if (refadjust) | |
1078 | SvREFCNT_dec(PL_curpad[po]); | |
1079 | ||
9ad9869c DM |
1080 | |
1081 | /* if pad tmps aren't shared between ops, then there's no need to | |
1082 | * create a new tmp when an existing op is freed */ | |
1083 | #ifdef USE_BROKEN_PAD_RESET | |
dd2155a4 DM |
1084 | PL_curpad[po] = NEWSV(1107,0); |
1085 | SvPADTMP_on(PL_curpad[po]); | |
9ad9869c DM |
1086 | #else |
1087 | PL_curpad[po] = &PL_sv_undef; | |
97bf4a8d | 1088 | #endif |
dd2155a4 DM |
1089 | if ((I32)po < PL_padix) |
1090 | PL_padix = po - 1; | |
1091 | } | |
1092 | ||
1093 | ||
1094 | /* | |
1095 | =for apidoc pad_reset | |
1096 | ||
1097 | Mark all the current temporaries for reuse | |
1098 | ||
1099 | =cut | |
1100 | */ | |
1101 | ||
1102 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
1103 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
1104 | * on the stack by OPs that use them, there are several ways to get an alias | |
1105 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
1106 | * We avoid doing this until we can think of a Better Way. | |
1107 | * GSAR 97-10-29 */ | |
1108 | void | |
1109 | Perl_pad_reset(pTHX) | |
1110 | { | |
97aff369 | 1111 | dVAR; |
dd2155a4 | 1112 | #ifdef USE_BROKEN_PAD_RESET |
dd2155a4 DM |
1113 | if (AvARRAY(PL_comppad) != PL_curpad) |
1114 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
1115 | ||
1116 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1117 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
1118 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1119 | (long)PL_padix, (long)PL_padix_floor | |
1120 | ) | |
1121 | ); | |
1122 | ||
1123 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
e1ec3a88 | 1124 | register I32 po; |
dd2155a4 DM |
1125 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1126 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1127 | SvPADTMP_off(PL_curpad[po]); | |
1128 | } | |
1129 | PL_padix = PL_padix_floor; | |
1130 | } | |
1131 | #endif | |
1132 | PL_pad_reset_pending = FALSE; | |
1133 | } | |
1134 | ||
1135 | ||
1136 | /* | |
1137 | =for apidoc pad_tidy | |
1138 | ||
1139 | Tidy up a pad after we've finished compiling it: | |
1140 | * remove most stuff from the pads of anonsub prototypes; | |
1141 | * give it a @_; | |
1142 | * mark tmps as such. | |
1143 | ||
1144 | =cut | |
1145 | */ | |
1146 | ||
1147 | /* XXX DAPM surely most of this stuff should be done properly | |
1148 | * at the right time beforehand, rather than going around afterwards | |
1149 | * cleaning up our mistakes ??? | |
1150 | */ | |
1151 | ||
1152 | void | |
1153 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1154 | { | |
27da23d5 | 1155 | dVAR; |
dd2155a4 | 1156 | |
f3548bdc | 1157 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 DM |
1158 | |
1159 | /* If this CV has had any 'eval-capable' ops planted in it | |
1160 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any | |
1161 | * anon prototypes in the chain of CVs should be marked as cloneable, | |
1162 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets | |
1163 | * the right CvOUTSIDE. | |
1164 | * If running with -d, *any* sub may potentially have an eval | |
1165 | * excuted within it. | |
1166 | */ | |
1167 | ||
1168 | if (PL_cv_has_eval || PL_perldb) { | |
e1ec3a88 | 1169 | const CV *cv; |
b5c19bd7 DM |
1170 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1171 | if (cv != PL_compcv && CvCOMPILED(cv)) | |
1172 | break; /* no need to mark already-compiled code */ | |
1173 | if (CvANON(cv)) { | |
1174 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1175 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); | |
1176 | CvCLONE_on(cv); | |
1177 | } | |
1178 | } | |
1179 | } | |
1180 | ||
dd2155a4 DM |
1181 | /* extend curpad to match namepad */ |
1182 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
1183 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); | |
1184 | ||
1185 | if (type == padtidy_SUBCLONE) { | |
551405c4 | 1186 | SV * const * const namep = AvARRAY(PL_comppad_name); |
504618e9 | 1187 | PADOFFSET ix; |
b5c19bd7 | 1188 | |
dd2155a4 DM |
1189 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1190 | SV *namesv; | |
1191 | ||
1192 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1193 | continue; | |
1194 | /* | |
1195 | * The only things that a clonable function needs in its | |
b5c19bd7 | 1196 | * pad are anonymous subs. |
dd2155a4 DM |
1197 | * The rest are created anew during cloning. |
1198 | */ | |
1199 | if (!((namesv = namep[ix]) != Nullsv && | |
1200 | namesv != &PL_sv_undef && | |
b15aece3 | 1201 | *SvPVX_const(namesv) == '&')) |
dd2155a4 DM |
1202 | { |
1203 | SvREFCNT_dec(PL_curpad[ix]); | |
1204 | PL_curpad[ix] = Nullsv; | |
1205 | } | |
1206 | } | |
1207 | } | |
1208 | else if (type == padtidy_SUB) { | |
1209 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
53c1dcc0 | 1210 | AV * const av = newAV(); /* Will be @_ */ |
dd2155a4 DM |
1211 | av_extend(av, 0); |
1212 | av_store(PL_comppad, 0, (SV*)av); | |
11ca45c0 | 1213 | AvREIFY_only(av); |
dd2155a4 DM |
1214 | } |
1215 | ||
1216 | /* XXX DAPM rationalise these two similar branches */ | |
1217 | ||
1218 | if (type == padtidy_SUB) { | |
504618e9 | 1219 | PADOFFSET ix; |
dd2155a4 DM |
1220 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1221 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1222 | continue; | |
1223 | if (!SvPADMY(PL_curpad[ix])) | |
1224 | SvPADTMP_on(PL_curpad[ix]); | |
1225 | } | |
1226 | } | |
1227 | else if (type == padtidy_FORMAT) { | |
504618e9 | 1228 | PADOFFSET ix; |
dd2155a4 DM |
1229 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1230 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) | |
1231 | SvPADTMP_on(PL_curpad[ix]); | |
1232 | } | |
1233 | } | |
f3548bdc | 1234 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 DM |
1235 | } |
1236 | ||
1237 | ||
1238 | /* | |
1239 | =for apidoc pad_free | |
1240 | ||
8627550a | 1241 | Free the SV at offset po in the current pad. |
dd2155a4 DM |
1242 | |
1243 | =cut | |
1244 | */ | |
1245 | ||
1246 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1247 | void | |
1248 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1249 | { | |
97aff369 | 1250 | dVAR; |
f3548bdc | 1251 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 DM |
1252 | if (!PL_curpad) |
1253 | return; | |
1254 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1255 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1256 | if (!po) | |
1257 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1258 | ||
1259 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1260 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1261 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1262 | ); | |
1263 | ||
1264 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1265 | SvPADTMP_off(PL_curpad[po]); | |
1266 | #ifdef USE_ITHREADS | |
7e736055 HS |
1267 | /* SV could be a shared hash key (eg bugid #19022) */ |
1268 | if ( | |
f8c7b90f | 1269 | #ifdef PERL_OLD_COPY_ON_WRITE |
7e736055 HS |
1270 | !SvIsCOW(PL_curpad[po]) |
1271 | #else | |
1272 | !SvFAKE(PL_curpad[po]) | |
dd2155a4 | 1273 | #endif |
7e736055 | 1274 | ) |
dd2155a4 | 1275 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 DM |
1276 | #endif |
1277 | } | |
1278 | if ((I32)po < PL_padix) | |
1279 | PL_padix = po - 1; | |
1280 | } | |
1281 | ||
1282 | ||
1283 | ||
1284 | /* | |
1285 | =for apidoc do_dump_pad | |
1286 | ||
1287 | Dump the contents of a padlist | |
1288 | ||
1289 | =cut | |
1290 | */ | |
1291 | ||
1292 | void | |
1293 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1294 | { | |
97aff369 | 1295 | dVAR; |
e1ec3a88 AL |
1296 | const AV *pad_name; |
1297 | const AV *pad; | |
dd2155a4 DM |
1298 | SV **pname; |
1299 | SV **ppad; | |
dd2155a4 DM |
1300 | I32 ix; |
1301 | ||
1302 | if (!padlist) { | |
1303 | return; | |
1304 | } | |
1305 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); | |
1306 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); | |
1307 | pname = AvARRAY(pad_name); | |
1308 | ppad = AvARRAY(pad); | |
1309 | Perl_dump_indent(aTHX_ level, file, | |
1310 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1311 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1312 | ); | |
1313 | ||
1314 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
e1ec3a88 | 1315 | const SV *namesv = pname[ix]; |
dd2155a4 DM |
1316 | if (namesv && namesv == &PL_sv_undef) { |
1317 | namesv = Nullsv; | |
1318 | } | |
1319 | if (namesv) { | |
ee6cee0c DM |
1320 | if (SvFAKE(namesv)) |
1321 | Perl_dump_indent(aTHX_ level+1, file, | |
c0fd1b42 | 1322 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c DM |
1323 | (int) ix, |
1324 | PTR2UV(ppad[ix]), | |
1325 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
b15aece3 | 1326 | SvPVX_const(namesv), |
b5c19bd7 DM |
1327 | (unsigned long)SvIVX(namesv), |
1328 | (unsigned long)SvNVX(namesv) | |
1329 | ||
ee6cee0c DM |
1330 | ); |
1331 | else | |
1332 | Perl_dump_indent(aTHX_ level+1, file, | |
b5c19bd7 | 1333 | "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n", |
ee6cee0c DM |
1334 | (int) ix, |
1335 | PTR2UV(ppad[ix]), | |
1336 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
4cf4a199 | 1337 | (long)U_32(SvNVX(namesv)), |
b5c19bd7 | 1338 | (long)SvIVX(namesv), |
b15aece3 | 1339 | SvPVX_const(namesv) |
ee6cee0c | 1340 | ); |
dd2155a4 DM |
1341 | } |
1342 | else if (full) { | |
1343 | Perl_dump_indent(aTHX_ level+1, file, | |
1344 | "%2d. 0x%"UVxf"<%lu>\n", | |
1345 | (int) ix, | |
1346 | PTR2UV(ppad[ix]), | |
1347 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1348 | ); | |
1349 | } | |
1350 | } | |
1351 | } | |
1352 | ||
1353 | ||
1354 | ||
1355 | /* | |
1356 | =for apidoc cv_dump | |
1357 | ||
1358 | dump the contents of a CV | |
1359 | ||
1360 | =cut | |
1361 | */ | |
1362 | ||
1363 | #ifdef DEBUGGING | |
1364 | STATIC void | |
e1ec3a88 | 1365 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
dd2155a4 | 1366 | { |
97aff369 | 1367 | dVAR; |
53c1dcc0 AL |
1368 | const CV * const outside = CvOUTSIDE(cv); |
1369 | AV* const padlist = CvPADLIST(cv); | |
dd2155a4 DM |
1370 | |
1371 | PerlIO_printf(Perl_debug_log, | |
1372 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1373 | title, | |
1374 | PTR2UV(cv), | |
1375 | (CvANON(cv) ? "ANON" | |
71f882da | 1376 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 DM |
1377 | : (cv == PL_main_cv) ? "MAIN" |
1378 | : CvUNIQUE(cv) ? "UNIQUE" | |
1379 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1380 | PTR2UV(outside), | |
1381 | (!outside ? "null" | |
1382 | : CvANON(outside) ? "ANON" | |
1383 | : (outside == PL_main_cv) ? "MAIN" | |
1384 | : CvUNIQUE(outside) ? "UNIQUE" | |
1385 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1386 | ||
1387 | PerlIO_printf(Perl_debug_log, | |
1388 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1389 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1390 | } | |
1391 | #endif /* DEBUGGING */ | |
1392 | ||
1393 | ||
1394 | ||
1395 | ||
1396 | ||
1397 | /* | |
1398 | =for apidoc cv_clone | |
1399 | ||
1400 | Clone a CV: make a new CV which points to the same code etc, but which | |
1401 | has a newly-created pad built by copying the prototype pad and capturing | |
1402 | any outer lexicals. | |
1403 | ||
1404 | =cut | |
1405 | */ | |
1406 | ||
1407 | CV * | |
1408 | Perl_cv_clone(pTHX_ CV *proto) | |
1409 | { | |
27da23d5 | 1410 | dVAR; |
dd2155a4 | 1411 | I32 ix; |
53c1dcc0 AL |
1412 | AV* const protopadlist = CvPADLIST(proto); |
1413 | const AV* const protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); | |
1414 | const AV* const protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); | |
1415 | SV** const pname = AvARRAY(protopad_name); | |
1416 | SV** const ppad = AvARRAY(protopad); | |
e1ec3a88 AL |
1417 | const I32 fname = AvFILLp(protopad_name); |
1418 | const I32 fpad = AvFILLp(protopad); | |
dd2155a4 | 1419 | CV* cv; |
b5c19bd7 DM |
1420 | SV** outpad; |
1421 | CV* outside; | |
71f882da | 1422 | long depth; |
dd2155a4 DM |
1423 | |
1424 | assert(!CvUNIQUE(proto)); | |
1425 | ||
71f882da DM |
1426 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1427 | * to a prototype; we instead want the cloned parent who called us. | |
1428 | * Note that in general for formats, CvOUTSIDE != find_runcv */ | |
1429 | ||
1430 | outside = CvOUTSIDE(proto); | |
1431 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) | |
1432 | outside = find_runcv(NULL); | |
1433 | depth = CvDEPTH(outside); | |
1434 | assert(depth || SvTYPE(proto) == SVt_PVFM); | |
1435 | if (!depth) | |
1436 | depth = 1; | |
b5c19bd7 DM |
1437 | assert(CvPADLIST(outside)); |
1438 | ||
dd2155a4 DM |
1439 | ENTER; |
1440 | SAVESPTR(PL_compcv); | |
1441 | ||
1442 | cv = PL_compcv = (CV*)NEWSV(1104, 0); | |
1443 | sv_upgrade((SV *)cv, SvTYPE(proto)); | |
7dafbf52 | 1444 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 DM |
1445 | CvCLONED_on(cv); |
1446 | ||
dd2155a4 DM |
1447 | #ifdef USE_ITHREADS |
1448 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) | |
1449 | : savepv(CvFILE(proto)); | |
1450 | #else | |
1451 | CvFILE(cv) = CvFILE(proto); | |
1452 | #endif | |
1453 | CvGV(cv) = CvGV(proto); | |
1454 | CvSTASH(cv) = CvSTASH(proto); | |
b34c0dd4 | 1455 | OP_REFCNT_LOCK; |
dd2155a4 | 1456 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
b34c0dd4 | 1457 | OP_REFCNT_UNLOCK; |
dd2155a4 | 1458 | CvSTART(cv) = CvSTART(proto); |
b5c19bd7 DM |
1459 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
1460 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); | |
dd2155a4 DM |
1461 | |
1462 | if (SvPOK(proto)) | |
b15aece3 | 1463 | sv_setpvn((SV*)cv, SvPVX_const(proto), SvCUR(proto)); |
dd2155a4 | 1464 | |
b7787f18 | 1465 | CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE); |
dd2155a4 | 1466 | |
b5c19bd7 | 1467 | av_fill(PL_comppad, fpad); |
dd2155a4 DM |
1468 | for (ix = fname; ix >= 0; ix--) |
1469 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1470 | ||
dd2155a4 DM |
1471 | PL_curpad = AvARRAY(PL_comppad); |
1472 | ||
71f882da | 1473 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 | 1474 | |
dd2155a4 | 1475 | for (ix = fpad; ix > 0; ix--) { |
53c1dcc0 | 1476 | SV* const namesv = (ix <= fname) ? pname[ix] : Nullsv; |
71f882da DM |
1477 | SV *sv = Nullsv; |
1478 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ | |
b5c19bd7 | 1479 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
71f882da DM |
1480 | sv = outpad[(I32)SvNVX(namesv)]; |
1481 | assert(sv); | |
1482 | /* formats may have an inactive parent */ | |
1483 | if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { | |
1484 | if (ckWARN(WARN_CLOSURE)) | |
1485 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
b15aece3 | 1486 | "Variable \"%s\" is not available", SvPVX_const(namesv)); |
71f882da DM |
1487 | sv = Nullsv; |
1488 | } | |
1489 | else { | |
1490 | assert(!SvPADSTALE(sv)); | |
1491 | sv = SvREFCNT_inc(sv); | |
1492 | } | |
dd2155a4 | 1493 | } |
71f882da | 1494 | if (!sv) { |
b15aece3 | 1495 | const char sigil = SvPVX_const(namesv)[0]; |
e1ec3a88 | 1496 | if (sigil == '&') |
dd2155a4 | 1497 | sv = SvREFCNT_inc(ppad[ix]); |
e1ec3a88 | 1498 | else if (sigil == '@') |
dd2155a4 | 1499 | sv = (SV*)newAV(); |
e1ec3a88 | 1500 | else if (sigil == '%') |
dd2155a4 DM |
1501 | sv = (SV*)newHV(); |
1502 | else | |
1503 | sv = NEWSV(0, 0); | |
235cc2e3 | 1504 | SvPADMY_on(sv); |
dd2155a4 DM |
1505 | } |
1506 | } | |
1507 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
71f882da | 1508 | sv = SvREFCNT_inc(ppad[ix]); |
dd2155a4 DM |
1509 | } |
1510 | else { | |
b5c19bd7 | 1511 | sv = NEWSV(0, 0); |
dd2155a4 | 1512 | SvPADTMP_on(sv); |
dd2155a4 | 1513 | } |
71f882da | 1514 | PL_curpad[ix] = sv; |
dd2155a4 DM |
1515 | } |
1516 | ||
dd2155a4 DM |
1517 | DEBUG_Xv( |
1518 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1519 | cv_dump(outside, "Outside"); | |
1520 | cv_dump(proto, "Proto"); | |
1521 | cv_dump(cv, "To"); | |
1522 | ); | |
1523 | ||
1524 | LEAVE; | |
1525 | ||
1526 | if (CvCONST(cv)) { | |
b5c19bd7 DM |
1527 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1528 | * The prototype was marked as a candiate for const-ization, | |
1529 | * so try to grab the current const value, and if successful, | |
1530 | * turn into a const sub: | |
1531 | */ | |
551405c4 | 1532 | SV* const const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 DM |
1533 | if (const_sv) { |
1534 | SvREFCNT_dec(cv); | |
9a957fbc | 1535 | cv = newCONSTSUB(CvSTASH(proto), Nullch, const_sv); |
b5c19bd7 DM |
1536 | } |
1537 | else { | |
1538 | CvCONST_off(cv); | |
1539 | } | |
dd2155a4 DM |
1540 | } |
1541 | ||
1542 | return cv; | |
1543 | } | |
1544 | ||
1545 | ||
1546 | /* | |
1547 | =for apidoc pad_fixup_inner_anons | |
1548 | ||
1549 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
7dafbf52 DM |
1550 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1551 | moved to a pre-existing CV struct. | |
dd2155a4 DM |
1552 | |
1553 | =cut | |
1554 | */ | |
1555 | ||
1556 | void | |
1557 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1558 | { | |
97aff369 | 1559 | dVAR; |
dd2155a4 | 1560 | I32 ix; |
66a1b24b AL |
1561 | AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; |
1562 | AV * const comppad = (AV*)AvARRAY(padlist)[1]; | |
53c1dcc0 AL |
1563 | SV ** const namepad = AvARRAY(comppad_name); |
1564 | SV ** const curpad = AvARRAY(comppad); | |
dd2155a4 | 1565 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
551405c4 | 1566 | const SV * const namesv = namepad[ix]; |
dd2155a4 | 1567 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 1568 | && *SvPVX_const(namesv) == '&') |
dd2155a4 | 1569 | { |
46c461b5 | 1570 | CV * const innercv = (CV*)curpad[ix]; |
7dafbf52 DM |
1571 | assert(CvWEAKOUTSIDE(innercv)); |
1572 | assert(CvOUTSIDE(innercv) == old_cv); | |
1573 | CvOUTSIDE(innercv) = new_cv; | |
dd2155a4 DM |
1574 | } |
1575 | } | |
1576 | } | |
1577 | ||
7dafbf52 | 1578 | |
dd2155a4 DM |
1579 | /* |
1580 | =for apidoc pad_push | |
1581 | ||
1582 | Push a new pad frame onto the padlist, unless there's already a pad at | |
26019298 AL |
1583 | this depth, in which case don't bother creating a new one. Then give |
1584 | the new pad an @_ in slot zero. | |
dd2155a4 DM |
1585 | |
1586 | =cut | |
1587 | */ | |
1588 | ||
1589 | void | |
26019298 | 1590 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
dd2155a4 | 1591 | { |
97aff369 | 1592 | dVAR; |
dd2155a4 DM |
1593 | if (depth <= AvFILLp(padlist)) |
1594 | return; | |
1595 | ||
1596 | { | |
44f8325f AL |
1597 | SV** const svp = AvARRAY(padlist); |
1598 | AV* const newpad = newAV(); | |
1599 | SV** const oldpad = AvARRAY(svp[depth-1]); | |
dd2155a4 | 1600 | I32 ix = AvFILLp((AV*)svp[1]); |
e1ec3a88 | 1601 | const I32 names_fill = AvFILLp((AV*)svp[0]); |
44f8325f | 1602 | SV** const names = AvARRAY(svp[0]); |
26019298 AL |
1603 | AV *av; |
1604 | ||
dd2155a4 DM |
1605 | for ( ;ix > 0; ix--) { |
1606 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
b15aece3 | 1607 | const char sigil = SvPVX_const(names[ix])[0]; |
26019298 | 1608 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') { |
dd2155a4 DM |
1609 | /* outer lexical or anon code */ |
1610 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1611 | } | |
1612 | else { /* our own lexical */ | |
26019298 AL |
1613 | SV *sv; |
1614 | if (sigil == '@') | |
1615 | sv = (SV*)newAV(); | |
1616 | else if (sigil == '%') | |
1617 | sv = (SV*)newHV(); | |
dd2155a4 | 1618 | else |
26019298 AL |
1619 | sv = NEWSV(0, 0); |
1620 | av_store(newpad, ix, sv); | |
dd2155a4 DM |
1621 | SvPADMY_on(sv); |
1622 | } | |
1623 | } | |
1624 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
26019298 | 1625 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
dd2155a4 DM |
1626 | } |
1627 | else { | |
1628 | /* save temporaries on recursion? */ | |
551405c4 | 1629 | SV * const sv = NEWSV(0, 0); |
26019298 | 1630 | av_store(newpad, ix, sv); |
dd2155a4 DM |
1631 | SvPADTMP_on(sv); |
1632 | } | |
1633 | } | |
26019298 AL |
1634 | av = newAV(); |
1635 | av_extend(av, 0); | |
1636 | av_store(newpad, 0, (SV*)av); | |
11ca45c0 | 1637 | AvREIFY_only(av); |
26019298 | 1638 | |
dd2155a4 DM |
1639 | av_store(padlist, depth, (SV*)newpad); |
1640 | AvFILLp(padlist) = depth; | |
1641 | } | |
1642 | } | |
b21dc031 AL |
1643 | |
1644 | ||
1645 | HV * | |
1646 | Perl_pad_compname_type(pTHX_ const PADOFFSET po) | |
1647 | { | |
97aff369 | 1648 | dVAR; |
551405c4 | 1649 | SV* const * const av = av_fetch(PL_comppad_name, po, FALSE); |
b21dc031 AL |
1650 | if ( SvFLAGS(*av) & SVpad_TYPED ) { |
1651 | return SvSTASH(*av); | |
1652 | } | |
5c284bb0 | 1653 | return NULL; |
b21dc031 | 1654 | } |
66610fdd RGS |
1655 | |
1656 | /* | |
1657 | * Local variables: | |
1658 | * c-indentation-style: bsd | |
1659 | * c-basic-offset: 4 | |
1660 | * indent-tabs-mode: t | |
1661 | * End: | |
1662 | * | |
37442d52 RGS |
1663 | * ex: set ts=8 sts=4 sw=4 noet: |
1664 | */ |